CN101903594A - Method for dealing with faults occurring during the manufacture of a material web - Google Patents

Method for dealing with faults occurring during the manufacture of a material web Download PDF

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Publication number
CN101903594A
CN101903594A CN2008801213224A CN200880121322A CN101903594A CN 101903594 A CN101903594 A CN 101903594A CN 2008801213224 A CN2008801213224 A CN 2008801213224A CN 200880121322 A CN200880121322 A CN 200880121322A CN 101903594 A CN101903594 A CN 101903594A
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CN
China
Prior art keywords
pressure
digital valve
flow
nip
roll nip
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Granted
Application number
CN2008801213224A
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Chinese (zh)
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CN101903594B (en
Inventor
阿托·伊科宁
埃罗·索米
佩卡·万托拉
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Valmet Technologies Oy
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Metso Paper Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—Regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—Regulating the pressure
    • D21G1/0046—Regulating the pressure depending on the measured properties of the calendered web
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40592—Assemblies of multiple valves with multiple valves in parallel flow paths

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  • Fluid-Pressure Circuits (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

The invention relates to a method for dealing with faults occurring during the calendering of a material web, said method comprising at least the following steps of: -identifying the location of a fault (H) on the surface of a roll (5) or in a material web and estimating or calculating an arrival time of the fault (H) at a roll nip (N) and a dwell time for the fault in the roll nip, -transmitting from a control system (4) to at least one digital valve unit (100), used for controlling a nip pressure of the roll nip (N), a feed-forward adjustment instruction (F) for dealing with a fault in the roll nip (N) of a calender, -reducing as per adjustment instruction (F), through the intermediary of at least one digital valve (1), a nip pressure of the roll nip (N) at the latest when the fault (H) arrives at the roll nip (N) and increasing the nip pressure as the fault exits the roll nip.

Description

Be used to handle the method for the defective that takes place during the web of material processing
Technical field
The present invention relates to a kind of method that is used to handle the defective that takes place during web of material (web) processing as described in the preamble as claimed in claim 1.
The invention still further relates to a kind of device that is used to realize the method as described in the preamble of claim 1.
The present invention includes and use the digital valve unit to control the action of the fiber machine portion of operating by hydraulic pressure or pneumatic actuator.
Background technology
Refer to its operation by the fiber machine portion of hydraulic pressure or pneumatic actuator operation and can be fed to the flow rate of fluid of described portion and/or the machine portion that pressure is controlled by adjustment.Fluid refers to liquid successively, for example oil or water, perhaps gas, for example air.
The digital valve unit refers to the valve cell that comprises at least one digital valve pack, and this digital valve pack comprises the many digital valve that are connected in parallel with respect to the fluid stream through digital valve pack successively.Through the flow of the fluid of digital valve pack by the aperture (aperture) of digital valve pack, also be that whole valves of the current digital valve that is shown in an open position in digital valve pack are opened area and determined.On the other hand, digital valve refers to and is intended to be used to adjust the flow of fluid and has 2-N the discrete valve of adjusting the position of different stageds, be preferably 2 different discrete adjustment positions (ON/OFF), and be preferably digitized from the control signal that control system is transported to this.The basis that being controlled at of the flow of forward direction (proceeding) by digital valve pack arrives the pressure reduction between digital valve pack and the fluid of discharging from digital valve pack takes place, and this difference depends on the aperture of current digital valve establishment at open position successively.The pressure reduction of the fluid in the known aperture of passing digital valve and digital valve pack can accurately be expected the fluid flow of forward direction by digital valve pack, and this can be used in during various high speeds feedforwards adjust.In the notion that feedforward is adjusted, according to the pneumatic or hydraulic actuator of digital valve pack coupling in the expectation action that takes place, select the connection combination of the digital valve of fluid process.
On the other hand, analog valve refers to the valve that depends on the size of control signal through the speed of flow of valve (choke valve, the opening degree of valve) in this application.Typical analog valve comprises servo valve and proportioning valve.
Fiber web refers to and comprises the part natural source at least, for example the width of cloth material of the fibrous material of wood fibre.Wherein, the fibrous material of use also can be made up of straw, bagasse, grass or the like.
Adjust the pressure and/or the flow velocity of the fluid that arrives hydraulic actuator and comprise some shortcomings by adjusting the sliding position that is worth proportional analog valve with control signal:
-be necessary for concrete runner to design each guiding valve (nominal dimension of valve, the i.e. details of the valves such as size of the various flowing ports (flow ports) of the valve in the maximum stream flow by valve, and size range) especially.Comprised that the system of analog valve has increased a large amount of design works like this.
-analog valve mainly is monomer or small quantities of the manufacturing, has increased their manufacturing cost like this.
-analog valve shows fluctuation (fluctuation) in adjustment, especially adjust the position and finally adjust between the position when existing than big-difference on the flow through the fluid of valve initial.The fluctuation of adjusting causes controlling more slowly and higher energy consumption.Another control factor of slowing down is the internal feedback of guiding valve, and this is used for using the position that adjusts guiding valve at valve from the process that flow A is driven into flow B.
More clearly, the present invention relates to the method for claim 1 and the device that can realize described method.
Replacing the analog regulation valve with the set of number valve is that the control of the hydraulic actuator that uses in the paper machine brings sizable benefit, and the problems of the prior art before can abandoning:
-similar digital valve and digital valve pack can be used in many application, and promptly digital valve is a multifunction valve.The operation of digital valve pack and serviceability depend on its control, this be because with regard to comprising the design of digital valve with regard to, do not have difference between the digital valve pack.
-digital valve is the commodity of the large-scale production of cheapness, only needs the size of seldom irrelevant intended use, and described intended use is the design and the operation of the hydraulic actuator of digital valve control.
-individual digit valve simplicity of design has good repetitive operation, no hysteresis.
-digital valve pack is fault-tolerant in operation, and when one of them digital valve breaks down, other valves can remedy its operation, and promptly fault is by " avoidance ".
The requirement of-relevant filtering flow is not stricter.
Summary of the invention
In paper machine, replace concrete analog valve with digital valve pack because each operation can use standard flow behavior digital valve pack rather than be the analog valve of application-specific design, and realize the quite design process of simplification.Like this because by using digital valve also usually can realize saving a large amount of energy, so usually in the valve design process, and also on the valve running cost, show bigger cost savings.Saving is owing to the following fact realizes: promptly, and the more accurate in operation and high speed of digital valve pack; Between two flows adjustment positions of very not waiting, drive analog valve causes adjustment probably owing to the feedback of adjusting fluctuation.On the other hand, in the feedforward adjustment modes, identical program can not postpone and fluctuate and be carried out rapidly, exactly with digital valve pack, because adjust the flow be applied to through a plurality of less digital valve that are arranged side by side, thus can the good predict forward direction through flow velocity (and the pressure reduction that passes valve in addition) when total flow of each combination of the digital valve of front opening.
The adjustment instruction (control signal) that arrives digital valve pack is digital, for example binary character.According to adjusting instruction,,, adjust the flow and the mobile pressure that causes of discharging from digital valve pack by opening valve combination concrete in the digital valve pack in view of the expectation aperture and the fluid volume flow velocity of realization digital valve pack.With respect to analog valve, each digital valve that is connected in parallel can only have the adjustment position of limited quantity, and promptly digital valve only has some discrete flow locations.In its a kind of form, digital valve has three positions: ON/OFF/high speed opening.Yet preferably, each digital valve position is simple ON/OFF; Open position at valve allows the certain flow process, blocks the passage that fluid is flowed through fully in the closed position.
In the embodiments of the invention that major part is described subsequently, digital valve pack is made up of the digital valve with two positions (ON/OFF).Therefore, in two digital valve of following mutually with regard to the nominal volume flow rate, forward direction always doubles the flow of the valve with less nominal flow rate by the flow at the valve with higher nominal flow rate of open position.Therefore, can give such digital valve pack supply binary control signal, wherein the value of control signal is converted into binary number.
Difference about the adjustment position between analog valve and the hydraulic valve bank, schematically relatively can present as follows: utilize control signal (adjusting instruction) to adjust analog valve with 12 sizes, the bar of described analog valve (stem) is advanced and the proportional distance of the 12nd control bit, and the flow that allows to strengthen separately of opening of valve passes through thus.On the other hand, when the digital valve pack of being set up by five ON/OFF digital valve that are connected in parallel at inlet flow is utilized 12 control signals (adjusting instruction) control of identical size, wherein the size of digital valve 1,2,3,4,5 flow of allowing is respectively 1,2,4,8 and 16, and control signal is converted into binary control signal 01100 (0 * 2 4+ 1 * 2 3+ 1 * 2 2+ 0 * 2 1+ 0 * 2 0=12) (corresponding to valve 5,4,3,2,1), and valve 3 and valve 4 are opened.
Above-mentioned digital valve pack further illustrates with respect to operating among Figure 1A and the 1B of analog valve.Figure 1A and 1B illustrate the quantity of the digital valve that comprises in the digital valve pack to obtainable flow number and to adjusting the influence of accuracy.
Figure 1A and 1B illustrate when digital valve pack has 4 (Figure 1A) being connected in parallel and 6 (Figure 1B) digital valve, and the quantity of the ON/OFF digital valve that comprises in the digital valve pack is to the influence of obtainable adjustment accuracy.Proportional flow of digital valve pack shown in the figure is the function of control, have in two valves of continuous nominal volume flow rate this moment in the digital valve that forward direction is organized by (valve), and the flow of the digital valve that the nominal volume flow rate is bigger is typically up to the twice of previous valve (also can ratio rather than organize with twice the flow of two valves with continuous nominal flow rate).In the drawings, the state of opening=0 that flow 0 expression digital valve pack has does not promptly have flowing of forward direction process, and 1 expression digital valve pack has the state of maximum diameter of hole, and promptly whole digital valve are shown in an open position; When N=4, the maximum total flow Vmax of process digital valve pack is Vmax=1V+2V+4V+8V=15V, and when N=6, maximum stream flow is Vmax=1V+2V+4V+8V+16V+32V=61V.As can seeing from Figure 1A and 1B, can make that possible opening number of combinations is approximate to be doubled because add each digital valve of group to, along with the increase of valve quantity in the digital valve pack, the response that the control response of digital valve pack can obtain near the simulation guiding valve rapidly.
Below description more specifically at the different portions and the functional block that apply the present invention to paper machine, and the advantage that obtains of the present invention wherein.The example that proposes comprises some references that apply the present invention to adjust given parameter in the roll nip.In this application, except as otherwise noted, roll nip refers to two roll nip between the roller, perhaps also refers to the roll nip that exists between roller and band.Band can be for example metal matter, polymer, woollen blanket type or silk screen (wire) type band.
Description of drawings
Therefore, the present invention will be illustrated by following.
The quantity that Figure 1A and 1B illustrate the digital valve that comprises in the digital valve pack is to obtainable flow number and to the influence of the accuracy adjusted.
Fig. 2 A schematically shows the glazing calender of directly observing to the end face of calender (calender).
Fig. 2 B illustrates the hydraulic actuator that utilizes the control of digital hydraulic pressure unit, the pressure load adjustment of the support bar that the end at two intermediate calender rolls is existed.
Fig. 2 C diagrammatic illustrates data and the fluid stream of controlling another hydraulic actuator according to Fig. 2 B.
Fig. 2 D illustrates the hydraulic actuator that utilizes two independent digital valve units synchronization controls and the support bar that exists two intermediate calender rolls ends to be coupled.
When Fig. 3 A is illustrated schematically in roll nip and is about to receive the defective of Fig. 3 B, load shedding (relief) pulse and the reset pulse of the roller that the roll nip of using the digital valve unit to form glazing calender exists; The flowing of hydraulic fluid in the hydraulic actuator shown in the figure, and the pressure load of roller.
Fig. 3 B illustrates directly and observes the roll nip that is about to receive joint fastener between two fiber webs (splice) between two rollers at end face.
Fig. 3 C is illustrated in before the load shedding pulse and reset pulse that forms Fig. 3 A, utilizes the lower state control of the support bar of roller between the digital valve cell pairs.
Fig. 3 D is illustrated in the load shedding impulse duration of Fig. 3 A, utilizes the support bar of digital valve unit controls intermediate calender rolls.
Fig. 3 E is illustrated in during the reset pulse of Fig. 3 A, utilizes the support bar of digital valve unit controls intermediate calender rolls.
Fig. 3 F illustrates directly and observes the roll nip that is about to receive the paper web interruption that is present in fiber web between two rollers at end face.
Fig. 3 G illustrates hydraulic fluid the flowing in hydraulic actuator that the roll nip of the glazing calender of setting up by digital hydraulic pressure unit exists when high speed opening, and the position of each roller in the roll nip in opening.
Fig. 3 H illustrates in the high speed opening process according to the roll nip between two intermediate calender rolls of Fig. 3 A glazing calender, and the pressure and the flow regime that exist at the piston head side and the piston rod side of cylinder are wherein by the pressure load of hydraulic cylinder control support bar.
Fig. 4 A schematically shows the long-nip calenders of directly observing to the end face of calender.
Fig. 4 B illustrates the long nip press zone of magnification ratio of the calender of Fig. 4 A.
Fig. 5 schematically shows the control procedure of the oil-water-to-water heat exchanger that utilizes digital hydraulic pressure unit.
Fig. 6 schematically shows based on the pressure load adjustment modes according to a loading element of the closed control system of prior art.
Fig. 7 schematically shows based on the pressure load adjustment modes according to the drive roll loading element of open control system of the present invention.
The specific embodiment
Press polish
The adjustment that comprises portion's (for example being intended to the hydraulic cylinder of the calender of calendered paper or cardboard) of hydraulic actuator uses the simulation guiding valve to carry out at present, and wherein sliding position (flow, pressure) is proportional with the value of adjusting instruction (control signal).The typical operation that utilizes the simulation guiding valve to adjust the hydraulic actuator of calender comprises:
-to the roll stacks of glazing calender in bottom roller and/or the pressurization of the hydraulic cylinder of top roller coupling, be used for adjusting the pressure of the roll nip of roll stacks, and in the defective of interrupting such as paper web the opening procedure of roll nip;
-act on the pressure load of the liquid braking device on the support bar of end of intermediate calender rolls by change, the load of the roll nip of glazing calender is adjusted;
-by changing the pressure load of inner roller loading element, to the adjustment of the pressure distribution (profile) of the CD orientation (CD-directed) of gross pressure in the roll nip of glazing calender and roll nip (hydraulic actuator from the inside of roller with force applications in the roller shell).As typical roller be the alleged Sym roller of applicant.
The pressure load of each bootstrap loading cylinder on the-support bar that exists by top roller and/or the bottom roller that reduces rapidly at the end of intermediate calender rolls and calender, the nip that the defective that paper web interrupts is for example arranged of high speed opening glazing calender;
-in the process (wet web pickup (web feeding)) of changing the fiber web that will on calender, move, reduce the nip load of the roll stacks of glazing calender.In the case, glazing calender can load (lever-loaded) by lever, i.e. the hydraulic cylinder that roll nip utilization and the support bar that exists in the end of intermediate calender rolls are coupled perhaps utilizes the loading element of inner roller hydraulic actuator operation to load.
Utilize servo valve or wherein sliding position and control signal be worth proportional proportioning valve (guiding valve), the operation of control hydraulic actuator is carried out the function of various calenders (changing the opened/closed and the wet web pickup of the loading distribution of roll nip in the roll stacks and load, roll nip) and is comprised some shortcomings:
Be necessary for concrete runner and design each guiding valve (nominal dimension of valve and the size of the flowing ports of the valve in the size range) in addition especially, like this to being comprised that the system of hydraulic unit has increased considerable design work;
The control of the hydraulic actuator of being carried out by guiding valve is to the defective sensitivity, and in addition, the electronic component of the control assembly of guiding valve is subject to high temperature and causes heat ageing and defective;
Guiding valve is by monolithic design, and their replacement part is expensive possibly as a result;
Because adjust fluctuation, the efficient of slide-valve is relatively low.
Owing to adjust feedback, the realization that utilizes guiding valve to come into force needs sensing system at double.
In the present invention, hydraulic actuator is controlled by the digital valve pack of digital valve unit, replaces thus all or the guiding valve that uses before some.The digital valve structure that comprises in the digital valve pack is just the same, and the unique difference between the digital valve that is connected in parallel is that valve allows the volume flow rate that passes through thus when open position.In addition, if the correct flow of planning one group digital valve permission process, in fact can be by the fault of appropriate change forward direction by a flow-compensated valve of other valves.Comprise the control electronic component in the digital valve self hardly, but its control is carried out by the control system of independent specific device.
For the above reasons, obtain some benefits by replace the pressure load that guiding valve is used for controlling the calender hydraulic actuator by one or more digital valve pack:
-provide sizable fault-tolerance with digital valve pack control hydraulic actuator than the control of implementing hydraulic actuator by guiding valve, because the fault of single valve is not enough to significantly weaken the operation of digital valve pack;
-digital valve pack comprises the control electronic component hardly, and the electronic component of digital valve assembly will can not become problem to resistant to thermal aging and temperature and vibration thus;
-use the digital valve pack of high speed adjustment response usually can use so-called feed-forward type to adjust strategy with the operation that is used to control hydraulic actuator, become simpler than in the relevant feedback adjusting strategy that uses of guiding valve of sensing system as a result, the relevant feedback adjusting strategy that uses of guiding valve need be adjusted continuously changing of the continuous sensing of parameter and control on its basis;
-in many application, replace guiding valves that improved efficiency up to 30% to 50% is provided with one or more digital valve pack.
-in digital valve pack, with regard to technical construction, all digital valve are identical standarized components, it is obviously more cheap than the situation of guiding valve to substitute trouble unit with another parts.
What the hydraulic actuator that-use digital valve unit exists the different ends at roller was controlled synchronously will be greatly early than traditional approach.When pressing the traditional approach execution, control to two hydraulic actuators existing in the opposite end of roller depends on flow distributor, depending on series connection actuator is set, and/or depending on the feedback adjusting of utilizing servo/proportioning valve in the situation of particular actuators control and control the actuator that each is connected in parallel.Use the digital valve unit of accurate control action can utilize two independent digital valve unit or when the use traffic distributor, utilize the individual digit valve cell, the actuator that is connected in parallel is controlled by the particular actuators of parallel connection.
Change the load of the support bar of calender
Next more detailed description one embodiment of the present of invention, promptly in the high speed opening and quick-make of roll nip in roll nip, control the hydraulic actuator of the pressure of the roll nip of being devoted to calender by digital valve pack, and the identical hydraulic actuator of adjusting the nip load of roll stacks by analog valve control.Embodiment has described the embodiment of the invention has been applied to glazing calender, but the present invention also can be used for single nip calender.
Prior art
Fig. 2 A schematically shows the glazing calender of directly observing at the end face of calender 500.
The glazing calender 500 of Known designs shown in Fig. 2 A own comprises the heated hot-rolling alternately and the roller of coated polymeric.The quantity of the roller of such hot-rolling and coated polymeric typically is 6 to 16 examples in the glazing calender, for example to carry that (Optiload) calender typically shows be 6 to 12 rollers to the so-called light that uses of applicant, wherein 2 to 5 is hot-rolling, and 4 to 7 is the roller of coated polymeric.Roll stacks 50 as the glazing calender shown in the example 500 among the figure comprises 6 rollers, and described roller is provided with the inside loading element that is used for changing (zone by zone) line pressure distribution that roll nip N district even distinguishes between two rollers.At least the top roller 5 of roll stacks 50; 5c and bottom roller 5; 5b is heatable hot-rolling, also has to be used for vertically adding knobbling rolls and hydraulic actuator its coupling (hydraulic cylinder) 2; 20; 202; 201.Top roller 5; 5c and bottom roller 5; The intermediate calender rolls 5 of four migrations is set between the 5b; 5a is at intermediate calender rolls 5; The end of 5a is the support bar 3 that is linked to calender body 55.Support bar 3 be applied to the lift (=pressure load) of intermediate calender rolls 5a and simultaneously the nip load of the roll nip N between two rollers can utilize the hydraulic actuator 2 that is connected to support bar with respect to the nip load (adjustment of the nip pressure profile of roll stacks) of other roll nip; 20 regulate.In addition, support bar 3 is used for adjusting the skew of intermediate calender rolls 5a, and skew is to be caused by the deadweight of these rollers 5a and the bearing load that exists in the end of roller.
For example, when on the support bar 3 of one of them the intermediate calender rolls 5a of for example Fig. 2 A that comprises in the glazing calender 500 that is applied to Fig. 2 A and utilize pressure load that hydraulic cylinder 20 establishes by the either side of regulating hydraulic cylinder piston on the simulation guiding valve of the flow of (all in piston rod side and piston head side) and/or pressure when controlling, adjusting strategy must be based on the feedback adjusting of the flow (and pressure) of the piston side of cylinder.So especially, causing problem in the adjustment action at a high speed, for example the pressure load of the opening procedure of roll nip N and roll nip N changes fast, and particularly the pressure load at the roll nip N that is established by hydraulic cylinder must change under the situation of quite big degree.Because the internal feedback of valve, guiding valve has significant internal latency, and in addition, the bigger change of flow causes fluctuation for the flow (and pressure) of discharging from valve.Reduced speed and validity that guiding valve is adjusted like this, also lowered efficiency in the dark.What enter hydraulic cylinder on the pressure side can not utilize guiding valve to change rapidly with the flow of active side, therefore, in fact, the adjustment of the back pressure (backpressure) on the bar side of hydraulic cylinder must be confined to the passive change of the flow that brings because of the fluid flow that is transported to piston side and the pressure that causes thus.Therefore, the high speed load shedding of the high speed opening of roll nip N and roll nip load all can not be carried out with guiding valve under the fault situation.
The preferred embodiment of the present invention is described
The method of digital valve pack used according to the invention provides accurately and regulator solution cylinder pressure 2 promptly; 20 on the pressure side (piston head side) goes up the fluid pressure of existence and the flow of hydraulic fluid, also also has the active side (piston rod side) of hydraulic cylinder to go up the back pressure of the hydraulic fluid that exists and the ability of flow.This is to have the benefit of the digital valve pack of adjusting response at a high speed and utilize the non-feedback adjusting of forward direction by the flow of the digital valve pack that comprises in the digital valve unit to realize by the whole instruction of the logarithm tone of Chinese characters.Back one benefit is because digital valve pack comprises a plurality of decimal fractions valves, the flow that forward direction passes through is in the always constant fact of open position, arrive the fluid of valve thus and the fluid of discharging from valve between pressure reduction the predictability of height is arranged for each aperture of digital valve pack.
In one embodiment of the invention, utilization is connected to the pressure of hydraulic cylinder of support bar of on the pressure side being devoted to the intermediate calender rolls of calender with at least one digital valve pack adjustment of active side of hydraulic cylinder, regulates on the pressure side flow and active side and flow on the pressure side and pressure.In a preferable configuration of the present invention, on each support bar of a roller, apply the digital valve unit controls of the hydraulic cylinder of load by them, synchronous working is gone up in a control system level (level) in these digital valve unit.In another preferable configuration of the present invention, on the support bar of roller, apply the operation utilization of hydraulic cylinder of load and cylinder coupling on the pressure side two digital valve pack and utilize with two digital valve pack of the active side coupling of cylinder and regulate.
In addition, in another preferred embodiment, be used to carry out the high speed opening of hydraulic cylinder with the digital valve pack of coupling on the pressure side of hydraulic cylinder.
In another embodiment of the present invention, the pressurization utilization of the roll nip of glazing calender and hydraulic cylinder on the pressure side with the digital valve pack of active side coupling, by change described hydraulic cylinder on the pressure side with active side on the fluid pressure that exists ratio and change fast.
Be used to regulate the controlled adjustment of digital valve of pressure load of the support bar of calender according to the present invention, provide a plurality of benefits than above-mentioned prior art:
-digital valve pack provide rapid control hydraulic cylinder on the pressure side with active side on the ability of fluid pressure and flow, like this can be initiatively and adjust the back pressure that exists on the pressure that exists on first side of cylinder piston and second side at a high speed.Because the ratio of flow on the not ipsilateral of piston helps the rapid adjustment of himself, so the position of hydraulic cylinder piston the and therefore pressure load that is applied on the support bar of end of roller of hydraulic cylinder can be by the expectation rapid adjustment.Can carry out the exact position of the support bar of intermediate calender rolls like this and adjust (pressure load), and even on narrow pressurization scope, carry out support bar pressurization ripple disable and adjust at a high speed.Like this and then the high speed and accurate adjustment of realizing distributing pressure load between the differential roller nip of calender cd directed pressure with the same roller nip distributing.
-because the pressure load adjustment of the support bar of the intermediate calender rolls of carrying out according to the present invention, provide a kind of in actively being devoted to the hydraulic actuator that lever loads on the pressure side with the control method of the flow (and fluid pressure is also arranged thus) of active side, the control procedure of its generation is with regard to efficient and energy consumption, in the change and high speed opening of the pressure load of the beginning of burnishing process and termination in roll nip, and in the lower state during press polish (wherein purpose is to keep certain counterpressure state in hydraulic actuator), all will be high speed and good.Adjust when comparing when loading, can realize being about 30% to 50% energy conservation based on the hydraulic actuator adjustment modes according to the present invention of digital hydraulic valve units with support bar that analogue technique is carried out.
The in fact ripple disable of-adjustment modes of the present invention utilizes the digital valve pack that the high speed opening ability is arranged and utilizes the feedforward adjustment modes because it comprises, fluid flow and fluid pressure on the control hydraulic cylinder both sides.
About the further benefit that the present invention obtains, it should be noted that the pressure load adjustment Billy of the support bar that utilizes digital valve pack reception numeral adjustment instruction to realize roller is more general with the guiding valve realization adjustment separately of being simulated control.This is due to the fact that digital valve pack is provided at the ability of valid function on more wide opereating specification considerablely that Billy can accomplish with guiding valve; Same digital valve pack can either can be operated in big range of flow again at the less range of flow that is transferred to hydraulic actuator.This is because the structural design of digital valve pack; Each digital valve pack is made up of the digital valve that the 2...n example independently is connected in parallel, and accurately knows the volume flow rate in the open position process, and provides and freely select those that possibility of the described valve that fluid flows through is arranged.Therefore, with the digital valve of some, can build upright different flow jointly by opening suitable digital valve pack.On the other hand, in the process of nominal flow rate that enlarges guiding valve and pressure reduction, might run into delay that the engineering type restriction (laminar flow is to turbulent flow) of flowing, inner valve feedback cause, about the technical limitations of valve material with increase the problem of investment cost.In addition, the in fact ripple disable of adjustment of the hydraulic actuator that digital valve pack is carried out, to be Billy carry out more stable significantly and reason more rapidly with the guiding valve of prior art for this.
Now will be by example, more detailed description realizes the loading procedure of the support bar of calender with digital valve pack according to the present invention.
Fig. 2 B schematically shows by single digital valve unit 100 and carries out the hydraulic actuator 3 that control is used for loading the support bar 3 of an intermediate calender rolls of glazing calender.
Fig. 2 C schematically shows the data and the fluid stream of one of them hydraulic actuator that is used for control chart 2B.
Fig. 2 D schematically shows equally by optional network specific digit valve group 100; 100 ' and 100; 100 " carry out the hydraulic actuator 2 that control is used to be carried in the support bar 3 that the end of an intermediate calender rolls of glazing calender exists, and the operation of this controlled hydraulic actuator 2 synchronously.
Fig. 2 B illustrates and utilizes the hydraulic pressure unit 100 comprise four digital valve pack 10, the pressurization adjustment of the support bar 3 that the every end in the intermediate calender rolls (not shown) is existed.Utilize the hydraulic actuator 2 of coupling with it; 20; 20 ' and 2; 20; 20 " to carry out the pressure load adjustment be to carry out with identical system to the support bar 3 that the every end at intermediate calender rolls is existed, and this is why the pressure load adjustment that only relates to left-hand side support bar 3 is more pressed close in following discussion.
Enter hydraulic actuator 2; The inlet flow of 20 20b on the pressure side is by way of the valve cell 30 that comprises the high speed opening safety valve; These can be by the conventional spool valves engineerings or are alternatively realized by one or more digital valve pack.
Be digital valve unit 100 shown in the bottom of Fig. 2 B, digital valve unit 100 and hydraulic cylinder 20 couplings, this hydraulic cylinder 20 act as the hydraulic actuator 2 that is used to load support bar 3, and digital valve unit 100 replaces normally used No. 4/2 valves (guiding valve).The digital valve unit of showing 100 can parallel control extend to the 20b on the pressure side of hydraulic cylinder 20 and two runners 6 of active side 20a respectively; 61,6; 62.In the case, the digital valve unit 100 that comprises 20 ON/OFF digital valve is divided into four digital valve pack 10; 10a, 10; 10b, 10; 10c and 10; 10d is comprising two digital valve pack 10, the 10b of active side (piston rod side) 20a of two digital valve pack 10c, the 10d of on the pressure side (piston head side) 20b of active adjustment hydraulic cylinder and active adjustment hydraulic cylinder.Digital valve pack 10b and 10c regulate from supply line 7; 71 edge streamlines 6 separately; 61 and 6; Be clipped to the inlet flow v of hydraulic fluid of pressurization of the 20b on the pressure side of the active side 20a of cylinder 20 and cylinder in 62 minutes sDigital valve pack 10d and 10a regulate respectively from the 20b on the pressure side of cylinder and active side 20a to tank line 7; 72 hydraulic fluid output stream.The fluid stream that is pressurized to certain known pressure is by way of identical supply line 7; 71 pass choke valve arrives control inlet flow v sBe transported to the 20b on the pressure side of hydraulic cylinder 20 and digital valve pack 10c, the 10b of active side 20a.Along supply line 7; The pressure of 71 inlet flow is for example produced by the pump (not shown).Enter tank line 7 from regulating by the digital valve pack 10d separately of the fluid stream that on the pressure side comes out with active side of hydraulic cylinder and the hydraulic fluid that 10a discharges; 72, tank line 7; 72 carry fluid enters the storage tank (not shown) by way of non-return valve (counter-valve).Each digital valve pack 10 of digital valve unit 100 comprises 5 ON/OFF digital valve 1, flow velocity in the open position process is so proportional, first valve has 1 unit flow velocity, second valve has 2 unit flow velocitys, the 3rd valve has 4 unit flow velocitys, the 4th valve has 8 unit flow velocitys, and the 5th valve has 16 unit flow velocitys, and the digital valve 1 of each digital valve pack has the valve combination 1 of the digital valve that 31 kinds of different open modes are provided thus AAbility, corresponding to combination of 31 kinds of flow velocitys or different digital valve pack 10 opening degrees.The 20b on the pressure side of hydraulic cylinder 20 and the streamline separately 6 of active side 20a; 61 and 6; 62 are connected respectively to pressure measuring device M; M " and M; M ', each pressure measuring device M; M " and M; M ' comprises bellows type balanced device and pressure gauge.Pressure measuring device M can measure the inlet flow of arrival digital valve pack 10 of the 20b on the pressure side of concrete time hydraulic cylinder 20 and active side 20a or the fluid pressure that the output stream of discharging from digital valve pack 10 exists.Based on institute's measuring pressure with arrive the inlet flow v of digital valve pack 10 from supply line 71 sInput pressure p s, can as described belowly be identified for the suitable aperture (digital valve of open mode is opened the gross area that presents in=the group) of digital valve pack of each desired pressure load of hydraulic cylinder 20.In this article, the pressure load P of hydraulic cylinder 20 kRefer to hydraulic cylinder 20 (piston 22) and be applied to the pressure on the support bar 3.
Use this digital valve unit 100 to make to point to the either side 20 of the piston 22 of hydraulic cylinder 20; 20a and 20; Flow V on the 20b; V 20aAnd V; V 20bActive on the more wide range of flow that obtains than most economical available guiding valve, quicker and adjustment exactly, two different runners of guiding valve Synchronization Control.By digital valve pack 10 execution and with respect to the 20b on the pressure side of hydraulic cylinder 20 and the volume flow rate V of active side 20a 20V 20b, V 20V 20aWith fluid pressure P 20P 20b, P 20P 20aThis active adjustment in fact than carrying out soon with guiding valve, wherein the adjustment of the active side 20a of hydraulic cylinder 20 is because delay that the internal feedback of guiding valve causes and because slowly can not the coming into force rapidly and on one's own initiative of the feedback adjusting that guiding valve is carried out.With respect to this, the adjustment that utilizes digital valve unit 100 to realize according to Fig. 2 B can use feedforward, the precognition adjustment modes controls hydraulic cylinder 2; Back pressure in 20 (=active side pressure) P 20a, because forward direction is by the valve combination 1 of current digital valve 1 at open position in the digital valve pack 10 AFlow velocity, and the inlet pressure p that also has the fluid of the arrival digital valve pack 10 that such combination obtains thus sWith from the hydraulic fluid pressure reduction between the pressure of digital valve discharge, i.e. streamline pressure P 6P 61Perhaps P 6P 62, can both predict very exactly.
In the illustrative circuitry of in Fig. 2 B and 2C, describing, at certain pressure p sFollowing supply line 7 by way of adjacent choke valve; 71 arrive digital valve unit 100, and pass through the digital valve pack separately 10 of fluid current control; 10c or 10; The 10b forward direction is on the pressure side 20 of cylinder; 20b or active side 20; 20a.At supply side, digital valve pack 10; 10c or 10; 10b has opened digital valve combination 1 A1 20bOr 1 A1 20a, provide from digital valve pack 10; 10c extends to the streamline 6 of the 20b on the pressure side of cylinder 20; The flow V of expectation in 62 6V 62, perhaps extend to the streamline 6 of the active side 20a of cylinder from digital valve pack 10b; Flow V in 61; V 61From each digital valve pack 10; 10b and 10; 10c longshore current line 6 is discharged to hydraulic cylinder 2; 20 flow V 6The flow V that on not homonymy 20a, the 20b of the piston 22 of cylinder, establishes respectively 20V 20aAnd V 20V 20b, can be from arrive the input pressure p of the fluid of digital valve pack (10b or 10c) along supply line 71 sWith digital valve pack 10 extend downwardly into cylinder 20 on the pressure side or the streamline separately 6 of active side; 62 and 6; The pressure P that exists in 61 6P 62And P 6P 61(the pressure P in the streamline 6 6Streamline 6 at the active side 20a that extends to cylinder; In 61 P 61, or extending to the streamline 6 of 20b on the pressure side; In 62 P 62) between the pressure reduction dp that exists accurately predict, also can from digital valve pack 10 when front aperture 1 A(1 among the digital valve pack 10b for example 20aControl enters the flow of hydraulic cylinder works side 20a, perhaps 1 among the digital valve pack 10b 20bControl enters the flow of the 20b on the pressure side of hydraulic cylinder) accurately predict.Forward direction enters the stream V of streamline 6 by any digital valve pack 10 6With the inlet flow v that arrives this concrete digital valve pack 10 sBetween pressure reduction dp so that depend on the aperture 1 of this digital valve pack 10 A
When the pressure load among the expectation roll nip N changes, change the 20b on the pressure side of inflow cylinder 20 and the V of flow separately on the active side 20a 20bAnd V 20aRatio, the fluid pressure P that exists on 20b on the pressure side that realizes changing respectively respectively at cylinder and the active side 20a 20bAnd P 20aRatio.Direction along expectation is guided out a pressure load P who is applied to the support bar 3 of intermediate calender rolls by cylinder 20 like this kArrive the 20b on the pressure side of hydraulic actuator 20 and the volume flow rate V of active side 20a 20bAnd V 20aBy the change separately digital valve pack 10c or the aperture 1 of 10b 20bOr 1 20aThe input effluent of control hydraulic fluid changes.From entrance side digital valve pack 10; 10c and/or 10; 10b is discharged to streamline 6; 62 or 6; Flow V in 61 6V 62Or V 6V 61And/or the fluid pressure P that exists respectively in the described streamline 6P 62Or P 6P 61Cause the not homonymy 20a and the 20b of the piston of hydraulic cylinder 20 to go up certain flow and fluid pressure.Therefore, described flow that causes as the not homonymy 20a or the 20b of cylinder 20 or pressure are at streamline 6; 61 or 6; 62 flow V 6V 61Or V 6V 62The basis on and/or the fluid pressure P that in streamline, exists 6P 61Or P 6P 62The basis on by calculating or when experience is learnt the aperture 1 of change digital valve pack 10c or 10b A1 20bOr 1 A1 20aCan be at the new horizontal V of volume flow rate 20V 20bAnd/or V 20V 20aAnd/or the new pressure separately and the backpressure level P of the 20b on the pressure side of hydraulic cylinder 20 and/or active side 20a expectation 20P 20bAnd/or P 20P 20aThe basis on implement.
When the input side digital valve pack 10b of 20b on the pressure side that leads to hydraulic actuator 20 or active side 20a or the one or more digital valve among the 10c were shown in an open position, the digital valve pack 10a of outlet side separately or all digital valve among the 10d of the output stream of controlled pressure side or active side were in the close position (the aperture 1A of group 10a or 10d is 0).
As the expectation on-load pressure P that reaches support bar 3 kThe time, reach equation P by the 20b on the pressure side and the last counterpressure that exists of active side 20a that make hydraulic cylinder 20 20bT=P 20aT, control enters lower state (equilibrium).As the known 20b on the pressure side of hydraulic cylinder 20 and the fluid pressure P of active side 20a of during burnishing process (lower state), being fed to 20TWith flow V 20T, i.e. flow V 20b=V 20bTAnd V 20a=V 20aT, and the 20b on the pressure side and the active side 20a of hydraulic cylinder goes up the counterpressure P that exists during the burnishing process 20b=P 20bTWith back pressure P 2Oa=P2 20aTLevel, for example on support bar 3, need from hydraulic cylinder 20 pressure load P kThe basis on, this information can be used in calculate or estimative figure valve group 10 in the valve combination 1 of the digital valve 1 that at every turn stays open A, this combination can be established the fluid pressure P of the balanced T of described hydraulic cylinder 20TWith flow V 20TIn case of necessity, the downstream pressure of digital valve pack 10 also can be monitored by pressure measuring device M, and can examine on this basis and adjust operation.
On the other hand, if the flow V on the active side of the 20b/ on the pressure side 20a of the rapid minimizing of expectation hydraulic cylinder 20 20b/ V 20aWith fluid pressure P 20b/ P 20a, with 20b/ active side 20a on the pressure side separately the each pressure that shows of pressure gauge M of streamline 62/61 coupling and hydraulic cylinder on the pressure side/the desired new pressure of active side is used as the basis of selecting the suitable digital valve that will open among output flow control digit valve group 10a or the 10d.Input side digital valve pack 10b or 10c digital valve is separately moved to the 20b on the pressure side that leads to cylinder 20 or the streamline 6 of active side 20a in order to prevent from the flow of pressurized fluid of supply line 71; 62 or 6; 61 and close.In fact, fluid stream is from the 20b on the pressure side or the active side 20a edge streamline on the pressure side 6 separately of hydraulic cylinder 20; 62 or active side streamline 6; 61 forward directions are to discharge currents (output stream) control figure valve group 10d or 10a.Suitably opening digital valve 1 among these digital valve pack 10a and the 10d can adjust from the digital valve pack longshore current line 61 discussed or 62 forward directions to tank line 7; 72 flow V 6V 61Or V 6V 62, and adjust the speed of output stream and size and the speed that drops on the 20b on the pressure side or the pressure on the active side 20a of cylinder 20 thus.
Fig. 2 C is illustrated schematically in the loading lever 3 that changes and keep an intermediate calender rolls of glazing calender; 3 ' and 3; 3 " pressure load P kProcess in the data flow of advancing between control system 4 and the digital valve unit 100, and on the basis of this data flow, pair of hydraulic cylinders 20 is shown also; 20 ', 20; 20 " support bar 3 that fluid stream exists in the end of intermediate calender rolls; 3 ' and 3; 3 " apply load on.Because hydraulic cylinder structure is identical, one of them hydraulic cylinder of pair of hydraulic cylinders shown in the figure 20.
The control module 42 that comprises in the control system 4 is from pressure gauge M; M ' and M; M " continuously or with specific interval receive at concrete moment at streamline 6; 62 and 6; The 61 fluid pressure P that exist 6P 62And P 6P 61Information, streamline 6; 62 and 6; 61 lead to piston head side (on the pressure side) 20b and piston rod side (active side) 20a of hydraulic cylinder 20 from digital valve unit 100.This pressure data P in the meter measurement 6The basis on, and be in application to support bar 3; 3 ' and 3; 3 " pressure load P kP k' and P kP KOn the basis, control system 4 can be identified for changing the process of roll nip load or be used to keep roll nip to adjust strategy in the suitable precognition of stable state load.This changes under the situation of process, adjusts on the basis of strategy in the precognition of programming before, and control system 4 decisions are changed the active side of hydraulic cylinder 20 and on the pressure side gone up the fluid pressure P by the sort of mode 20P 20aAnd P 20P 20bRatio, change to which kind of degree and how long continue a period of time, make roll nip nip pressure and act on pressure load P on the nip pressure of hydraulic cylinder kP k', P kBy establish desiredly.On the basis of these pressure change parameters, the control module 42 of control system 4 calculates each hydraulic cylinder 20; 20 ' or 20; 20 " piston rod side (active side) 20a and piston head side (on the pressure side) 20b are at the flow V of the fluid of concrete moment expectation 20V 20aAnd V 20V 20b, and may also have separately fluid pressure P 20P 20aAnd P 20P 20bThe active side of each cylinder and flow V on the pressure side 20V 20aAnd V 20V 20bWith the active side 20a of the downstream hydraulic cylinder 20 that extends to digital valve pack and the streamline 6 of 20b on the pressure side; 61 and 6; Particular flow rate V in 62 6V 61And V 6V 62, and pressure P 6P 61And P 6P 62Coupling.The control module 42 of control system 4 is that unit calculator 41 provides the information about the active side of cylinder 20 and these new flow velocitys on the pressure side, unit calculator 41 calculates which the aperture 1A that needs each digital valve pack 10 for the flow rate that reaches expectation, and each digital valve pack is instructed in separately adjustment of transmission.Be transferred to each digital valve pack 10; 10a, 10; 10b, 10; 10c and 10; The adjustment instruction of 10d is binary system adjustment instruction, and it comprises the flow adjustment function F (V) of hydraulic fluid or the position adjustment function F (X) of hydraulic cylinder piston, and comprises relevant at least each digital valve pack 10; 10a, 10; 10b, 10; 10c and 10; Which valve 1 will be opened and which information with closed (opening of digital valve pack) and lasting duration among the 10d.
Hydraulic cylinder 20 on the pressure side relate generally to beginning/terminal procedure in the press polish of concrete paper/board grades with the above-mentioned change of the fluid of active side stream and pressure, wherein the change of pressure load is extremely important.Along with the continuation of lower state press polish, purpose is to keep each hydraulic cylinder 20; 20 ' and 20; 20 " pressure on the pressure side and active side back-pressure are equal to each other, thereby purpose is to make the pressure load P that is applied to the loading lever of intermediate calender rolls from hydraulic cylinder kMaintain certain constant level.Because each digital valve pack 10 has at streamline 6; 61 and 6; The ability of the discrete flow that does not wait in a large number is provided in 62, realize hydraulic cylinder 20 on the pressure side with the same a large amount of flow/pressure state of active side, so can use same digital valve pack to realize occurring in the progressively flow and the pressure change of lower state, and occur in the beginning of burnishing process and the big pressure and the flow change of ending phase in addition.
When using above-mentioned adjustment modes, owing to have the existing knowledge of promptly establishing the flow of streamline 6 by certain combination of the valve of open mode about by the concrete aperture 1A of each digital valve pack 10, so the active side of hydraulic cylinder or pressure adjustment on the pressure side need not carried out by feedback system.Therefore, control each hydraulic cylinder 20 on the pressure side with the system 4 of the fluid of active side stream and pressure thereof in the requirement of required measuring-signal will be simplified, and return relevant with the analog valve required compound sensing system that circulates also no longer needs.
Hydraulic actuator synchronously
By use current divider, the actuator or independently control each actuator of being connected in series by (positional) or the relevant servo valve/proportioning valve that is fed back to characteristic of flow in order to the position, in paper-making industry, realized the synchronous of two or more hydraulic actuators 2 traditionally.
If utilize current divider to carry out synchronously, described synchronous accuracy depends on the manufacturing tolerance of the parts of described current divider.On the other hand, if hydraulic actuator 2 series connection are provided with, failure problems will be arranged; If can not be synchronous, actuator must be accepted the general outside maintenance work of carrying out that requires.The problem of the particular actuators control that the control circuit of utilization comprises servo/proportional control valve is implemented is the expensive of sort circuit.In addition, the defective of this control valve is a large amount of pressure losses, and in order to realize synchronously, needs special position adjustment control and the feedback of adjusting.
Two hydraulic actuators of this simultaneously operating can utilize digital valve unit 100 to carry out by traditional approach, also pass through to use current divider by the actuator 2 that uses series connection, and the flow of discharging from same digital valve pack is divided to different hydraulic actuators thus.The system of describing among Fig. 2 B and the 2C uses the same numbers valve group 10 of digital valve unit 100 to come two hydraulic actuators 2 of Synchronization Control in every end existence of roller; 20 ' and 2; 20 ".The stream that comes out from each digital valve pack is diverted to different hydraulic actuators at suitable point, shown in Fig. 2 B.
Yet, being carried out by the digital valve engineering of the one or more digital valve unit 100 by using particular actuators synchronously preferably of hydraulic actuator 2: each actuator utilizes the digital valve unit of himself to adjust separately, and these digital valve unit operate on the control system level synchronous.Each digital valve pack of digital valve unit 100 is provided with the flow instruction F (V) of time correlation or the adjustment instruction that function F (X) (seeing Fig. 2 C) is adjusted in the position, like this, subsequently, digital valve pack does not have delay, adjusts and to go to actuator/or flow of arriving from actuator exactly.Thereby, the speed of the accurate regulator solution hydraulic actuator of digital valve pack.The reason that the accuracy of adjusting is carried out in digital valve unit 100 is the fact that a) operation of each digital valve pack 10 of digital valve unit can be controlled exactly in the feedforward adjustment modes, adjust the not also not free generation lingeringly of feedback, and b) quantity of the digital valve unit that directly comprises with system of the adjustment accuracy of digital valve unit and the proportional fact of nominal flow rate of each valve cause, indicate about the description of Figure 1A and 1B as above.Even the ON/OFF digital valve has very little quantity increase also to realize adjusting the remarkable improvement of accuracy.
The embodiment that schematically shows among Fig. 2 D shows, to the control of the operation of the identical hydraulic actuator 2 of two parallel connections, described control utilize two that separate, also utilize control system to interknit the digital valve pack 100 of effect; 100 ' and 100; 100 " carry out.Hydraulic actuator 2 is the hydraulic cylinders 20 that are used to control the position of load shedding bar (relieflever), and the load shedding bar is present in for example end of public roller, and is identical with the mode that exists among Fig. 2 B and the 2C.Each hydraulic cylinder 20; 20 ' and 20; 20 " by its own specific digital valve pack 100; 100 ' and 100; 100 " control.Each digital valve unit 100 ' or 100 " comprise four digital valve pack 10; 10a, 10; 10b, 10; 10c and 10; 10d.Digital valve unit 100 ' and 100 ", and the digital valve pack 10 that wherein comprises, structure, operation are identical each other, and why described the same structure member of Here it is digital valve unit indicate with same Reference numeral.Each digital valve unit 100; 100 ', 100; 100 " in digital valve pack 10a, the 10b, 10c and the 10d that comprise be used for adjusting no matter arrive which hydraulic actuator 20 ' or 20 " on the pressure side or the stream of active side, the perhaps stream of discharging therefrom.Each digital valve pack 10 comprises n digital valve, and Fig. 2 D only shows in each digital valve pack 10 first and last digital valve 1.The digital valve pack of Reference numeral 10a and 10b indication is used to adjust on the pressure side (piston head side) 20b of each hydraulic actuator via streamline 6; 62 inlet flow and output stream.The digital valve pack of Reference numeral 10c and 10d indication is used to adjust active side (piston rod side) 20a of each hydraulic actuator 20 successively via streamline 6; 61 inlet flow and output stream.Therefore, the hydraulic fluid of pressurization stream vs; Vs ' or vs; Vs ", from supply line 7; 71, arrive digital valve unit 100 by way of the valve forward direction; 100 ' or 100; 100 ", and further by each digital valve unit 100 ' or 100 " digital valve pack 10b or 10c, enter the 20b on the pressure side or the active side 20a (in this order) of relevant hydraulic cylinder 20.From each hydraulic cylinder 20; 20 ' or 2; 20 " the hydraulic fluid stream v that 20b on the pressure side or active side 20a discharge tv t' or v tv t" arrive digital valve pack 10a or 10d via streamline 62 or 61, and further arrive tank line 7; 72.Each hydraulic cylinder 20; 20 ' or 20; The establishment of the flow of 20b on the pressure side 20 " or the desired magnitude of active side 20a is by carrying out to Fig. 2 B mode similar with the system shown in the 2C, yet should remember each hydraulic cylinder 20; 20 ' or 20; 20 " has the digital valve unit 100 of the corresponding hydraulic cylinder of control of oneself; 100 ' or 100; 100 ".From supply line 7; 71 arrive hydraulic cylinders 20 ' and 20 " inlet flow v sv s' and v sv s", perhaps from hydraulic cylinder 20 ' and 20 " be discharged to tank line 7; 72 output stream v tv t' and v tv t" at the common supply line 7 that arrives separately; 71 or tank line 7; Do not contact mutually in any case before 72.In fact, digital valve unit 100 ' and 100 " mutual simultaneously operating, and the mutual simultaneously operating of hydraulic actuator 20 meanwhile with regard to Control Engineering, is the adjustment instruction process that is assigned to the there by the control system (not shown) that gets involved.Therefore, each hydraulic actuator 20 ' and 20 " the control that arranged certain time delay of flow; flow instruction F (V) ' by expectation is provided by particular time interval and F (V) " to each digital valve unit 100 ' or 100 " and undertaken by the adjustment of feed-forward mode, described flow instruction F (V) ' and F (V) are " identical.Because the active side of the position of piston place of known hydraulic actuator 20 and hydraulic actuator and on the pressure side go up the pressure that exists, instruct F (X) so only provide at the position of piston adjustment of hydraulic actuator 20 for the digital valve unit.This be because the active side 20a of hydraulic actuator 20 and on the pressure side 20b go up pressure that special time exists directly with streamline 61 and 62 in the fluid pressure that exists and the forward direction proportional fact of flow (aperture of digital valve pack) of passing through the digital valve pack 10 of digital valve unit 100, as the explanation of being carried out in conjunction with the description of the system shown in Fig. 2 B and the 2C.Digital valve unit 100; 100 ', 100; 100 " do not comprise big time delay; but; the realization of certain volume or position adjustment instruction F (V), F (x) is accurately, at a high speed and excellent with regard to repeatable speech, thus with these digital valve unit 100 ', 100 " hydraulic actuator separately 20 that is coupled ', 20 " simultaneously operating.
Because be derived from difference, fancy price and the valve adjustment problem when little opening of the manufacturing nominal of valve, the active side of two different hydraulic actuators and simultaneously operating on the pressure side are in fact impossible.Yet, by using the digital valve unit, this four tunnel couplings of two hydraulic actuators can be set up without a doubt, in hydraulic actuator, arrive the active side 20a of hydraulic cylinder and on the pressure side 20b stream and from the active side 20a of hydraulic cylinder and on the pressure side the 20b fluent usefulness of discharging they, hydraulic pressure group 10a, the 10b, 10c and the 10d that independently control control.
The instant change of the high speed opening of the roll nip of calender and roll nip load
Changing cardboard/paper grade or cardboard/paper web being connected in the process of another cardboard/paper web, it is desirable to only when the joint fastener between two continuous fibers width of cloth materials passes through the roll nip of calender, give the roll nip load shedding (relieve) of calender.Such requirement is at the calender that is positioned at machine coating machine dirty (downstreem), and machine dynamically develops in the joint fastener calender outward.
On the other hand, if the roll nip of calender must be opened fully, for example under the situation that width of cloth material interrupts, will be desirable if the driving moment of roller (rotating speed of roller) does not need opening and changing in the process of closed roll nip once more.
At present, servo valve and proportioning valve (guiding valve) are used for corrective action in the end of intermediate calender rolls or from the pressure of the hydraulic actuator of roller internal action on the roller shell, and/or are used to adjust and raise or reduce the top roller of glazing calender and the loading cylinder of bottom roller.Yet guiding valve can only effectively be worked on narrow flow/pressure scope, and has long relatively delay in the execution of adjusting; If the pressure load of hydraulic cylinder must change rapidly and meanwhile enter the active side of hydraulic cylinder and flow on the pressure side is subjected to sizable change, even hydraulic actuator self can be immediately and operation exactly so, also delay that will cause and the adjustment fluctuation that causes by the feedback adjusting strategy and have problems because of feedback adjusting by slide valve lever.In fact, when keeping the speed of service of calender, the high speed load shedding that guiding valve can not be carried out calender roll nip load can not be carried out the fast instant open and close of roll nip.
The objective of the invention is to eliminate front shortcoming of the prior art.
Therefore, the purpose of this invention is to provide a kind of apparatus and method, the nip load that described apparatus and method make roll nip is load shedding immediately, and the nip that resets initial again load, loading-the load shedding of roll nip-reloading circulation just becomes fast as much as possible like this, even same enough accurate with regard to the pressure load variation of roll nip.
The high speed opening of roll nip and closed again when another object of the present invention provides the calender speed of service and remains unchanged.
According to device of the invention process, and roll nip load shedding and the deployment method wherein used, the ability that realizes above-mentioned purpose can be provided.
This embodiment of the present invention is based on the following fact, utilize lever 3 that digital valve unit 100 control actions exist in the end of intermediate calender rolls 5 or act on the hydraulic actuator of for example hydraulic cylinder 20 on the roller shell in the roller, and/or the loading cylinder of directly on the top roller of calender and bottom roller, exerting pressure, be used to generate the load shedding pulse and the reset pulse of the pressure load of roll nip N after this of the pressure load of roll nip N.Identification arrives the position of the joint (joint) that comprises in the fiber web of glazing calender, and estimates or calculate the time its each roll nip that arrives calender and process there thereof.The continuous rolling district of glazing calender 500 is subjected to each other suitably the load shedding pulse and the reset pulse of synchronous roll nip, is used for by the joint H between two fiber webs of controlled way transmission; Ws is by the roll nip of glazing calender.
In order to produce the load shedding pulse, in equilibrium state, by using the digital valve of suitable digital valve pack 10, the volume fluid stream that exists on the active side with respect to hydraulic cylinder 20 cuts back the flow of (piston side) on the pressure side that (cut back) enters hydraulic cylinder 20 immediately, reduces the pressure load of roll nip N.Fully reduced in case cylinder 20 is applied to the pressure load that loads on the lever 3, the active side of hydraulic cylinder 20 and the ratio of on the pressure side going up the pressure of existence recover equal again.Immediately have additional supply of the fluid stream on the pressure side of hydraulic actuator by the digital valve (load pulses) of using suitable digital valve pack 10, after the certain hour section, it reaches equilibrium state with respect to the volume fluid stream that exists on the active side, and the pressure load that hydraulic actuator is applied to roll nip returns to the level that exists before the load shedding pulse again.In case pressure load has returned to pre-change level again, hydraulic actuator, for example the pressure of hydraulic cylinder 20 should be equal to each other.
Another embodiment of the present invention is followed successively by based on the following fact: utilize the digital valve unit be linked to hydraulic actuator, make roller loading element with hydraulic actuator (such as hydraulic cylinder) coupling be subjected to stepped, quicken open pulse.The minimizing of roller loading element load arrives the flow (with the pressure that wherein exists simultaneously) of hydraulic actuator to carry out based on the adjustment modes of feedforward by the change that distributes according to flow change certain, that determine before.This embodiment of the present invention is practicable during the fiber web interruption accident that for example takes place in burnishing process; The fiber web point of interruption on the fiber web of identification arrival calender, and the time of estimating and calculating the roll nip of point of interruption arrival calender.When the fiber web point of interruption arrived roll nip, described roll nip was opened the method according to this invention immediately, presses the traditional approach closure then.
Hereinafter, these embodiment of the present invention use and schematically work example and use Fig. 3 A relevant with it and Fig. 3 B explanation.
Fig. 3 A schematically shows when described roll nip receives the defective that exists on the fiber web, for the roll nip in the glazing calender provides load shedding pulse and reset pulse.
Fig. 3 B illustrates a roll nip in the glazing calender, and it is about to receive the defective that exists on the fiber web.
When Fig. 3 C-3E is illustrated in the support bar of hydraulic cylinder loaded roll, the flow that takes place during the load shedding pulse of Fig. 3 A and the reset pulse and the variation of fluid pressure.
Fig. 3 F illustrates a roll nip of glazing calender, and it is about to receive paper web and interrupts.
Fig. 3 G illustrates successively when described roll nip is about to receive the paper web that exists on the fiber web and interrupts, the opening immediately of the roll nip of the glazing calender by method of the present invention.
When Fig. 3 H is illustrated in the support bar of hydraulic cylinder loaded roll, the flow that takes place during the roll nip of Fig. 3 E is opened and the variation of fluid pressure.
Provide the load shedding pulse and the reset pulse of the roll nip shown in Fig. 3 A-3E, and the opening immediately of the roll nip shown in Fig. 3 F-3H, the example of glazing calender 500 that will be by being applied to Fig. 2 A illustrates, and glazing calender 500 is used for intermediate calender rolls 5; The control system 4 of the support bar 3 of 5a be used to control support bar digital valve unit 100 be consistent for example with those of Fig. 2 D.Same, control is used to promote the bottom roller 5 of the roller group of calender 500; 5b also oppresses top roller 5; The loading cylinder of 5b can similar digital valve unit 100 and the control system 4 thereof of enough parts at least be realized.
Fig. 3 A-3E illustrates when defective H crosses (traverse) roll nip, for example the joint H between two fiber webs shown in Fig. 3 B; W s, then by digital valve unit 100 control, the hydraulic cylinder 20 on the support bar that exists for the end of the intermediate calender rolls that acts on glazing calender provides load shedding (relief) pulse and reset pulse.When defective process roll nip, load shedding pulse and reset pulse provide the piston 22 that changes hydraulic cylinder 20 to be applied to the pressure load K of support bar pMethod.The change of pressure load of one of them support bar of the end that utilizes load shedding pulse and reset pulse only to be applied to intermediate calender rolls only is shown among the figure, uses and similarly control and be subjected to identical, synchronous load shedding pulse and reset pulse shown in Fig. 2 B-2D because of the support bar of the other end of intermediate calender rolls.
Fig. 3 B illustrates two stacked rollers 5, leaves roll nip N between the roller.For example, roller comprises the roller that comprises in the glazing calender of two Fig. 2 A.The fiber web W that treats press polish crosses roll nip.The N of roll nip shown in the figure will receive two different fiber web W at once; W1 and W; Joint W between the W2 sState.
The top of Fig. 3 A illustrates the joint H as the fiber web W of Fig. 3 B; W sWhen arriving roll nip, the load shedding pulse and the reset pulse of the roll nip of generation.Enter the flow V of hydraulic fluid of on the pressure side (piston head side) 20b of hydraulic cylinder 20 during load shedding pulse of roll nip shown in the figure and the reset pulse 20bThrough the change of certain hour t, and the bottom among the figure illustrates at identical time t and takes place, and is applied to the pressure load K on the support bar pChange.This embodiment of the present invention is based on the pressure load K that realizes with digital valve unit 100 during the pressure load reset pulse of the pressure load load shedding impulse duration of roll nip N and roll nip N pFEEDFORWARD CONTROL.
Fig. 3 C-3F illustrates the action of the piston 22 of hydraulic cylinder, and it occurs in during the load shedding pulse and reset pulse of roll nip, and is used to control the pressure load K of the support bar of the roller that is positioned at roll nip pIn addition, Fig. 3 B-3D illustrates the not ipsilateral 20a of the piston 22 of delivering to hydraulic cylinder 20 from digital valve unit 100 and the hydraulic fluid stream V of 20b 20aAnd V 20b, and the fluid pressure P that flows establishment by hydraulic fluid 20a, P 20bFig. 3 C-3F schematically shows digital valve unit 100, this digital valve unit 100 for example can be similar to shown in Fig. 2 D, comprise four digital valve pack 10a, 10b, 10c and 10d, wherein two digital valve pack are used to control the fluid stream of the piston head side 20b that enters hydraulic cylinder, and wherein two digital valve pack are carried out same control to piston rod side 20a.
Fig. 3 F illustrates two stacked rollers 5, leaves roll nip N between roller.Roller for example comprises the roller that comprises in two glazing calenders as Fig. 2 A.The fiber web W that treats press polish crosses roll nip.The N of roll nip shown in the figure will receive fiber web W at once and go up the paper web interruption W that exists kState.
On the other hand, Fig. 3 G illustrates as the interruption of the paper web shown in Fig. 3 F H; W kWhen arriving roll nip, open roll nip immediately with method of the present invention.Upper view illustrates the volume fluid stream V of the 20b on the pressure side that is transported to hydraulic cylinder 20 20aThrough the variation of certain hour section t, and lower view schematically shows roller 5 and goes up vertically position at one time and change (for example, the roll nip between two rollers, the peak of lower roller changes in the position of vertical direction).The position that shows the roll nip N central roll 5 of calender as Fig. 3 E changes, and gives roller on-load pressure load K by support bar 3 pThe relative position of piston 22 change will be with along hydraulic cylinder 20 vertically similar.The pressure load K of the support bar of the change of the position of piston 22 when opening roll nip and relevant roller pChange in Fig. 3 H, be shown in further detail.
Flow V when the fluid that is fed to hydraulic cylinder 20 20And pressure P 20When controlling by the digital valve unit 100 that comprises a plurality of digital valve pack 10, as in conjunction with at the description of control roll support bar 3 among Fig. 2 B-2D determined like that, pass through the flow of the concrete digital valve pack 10 in the digital valve unit 100 and will in all range of flows of hydraulic cylinder 20, be learnt in advance.Aperture 1 according to each digital valve pack 10 A, and according to the fluid pressure p that exists in the supply line that arrives digital valve pack sOr leave the tank line 7 of this digital valve pack; The fluid pressure p that exists in 72 tFluid pressure P with operation in the streamline 6 that extends to hydraulic cylinder 20 6Between pressure reduction just know flow.
When the digital valve pack 10b of for example digital valve unit 100 shown in Fig. 3 C-3F along supply line 7; 71 provide inlet flow V s, the average pressure that is applied to the tube wall of supply line thus is p s, longshore current line 6; 62 escape to the flow V of the 20b on the pressure side of hydraulic cylinder 20 from this concrete digital valve pack 10b 62The speed fluid pressure P that will in leading to the streamline 62 that loads cylinder 20, exist 62With determine on the basis of the opening of current digital valve pack 10b.Based on the opening of digital valve pack 10b, i.e. total flowing ports of the digital valve of current open mode establishment also promptly based on the throttle degree that is provided by digital valve pack, can accurately be predicted the fluid pressure P 62Enter streamline 6 because leave the digital valve pack 10b of digital valve unit 100; The flow V of 62 (20b on the pressure side of hydraulic cylinder is gone in the stepping of going forward side by side) 62With the pressure P that exists in the streamline 62 62Can accurately predicting, so even without feedback adjusting, the fluid pressure P that on the piston head side 20b of hydraulic cylinder 20, launches 20bWith fluid flow V 20bAlso can predict, realize adjusting at a high speed and accurately.Because known control is from supply line 7; 71 enter streamline 6; The opening 1 of the digital valve pack 10c of 61 flow A(also visible Fig. 2 D description), the piston rod side 20a that also has that equally can reliable prediction goes up the fluid pressure P that exists 20aWith fluid flow V 20a, and streamline 6; Fluid pressure P in 61 61With flow V 61Speed.
Now, when utilizing the hydraulic cylinder 20 that is coupled by the streamline of getting involved 6, expectation in digital valve unit 100, generates the pressure load K of the support bar of intermediate calender rolls pThe load shedding pulse of high speed roller pressing district load and during reset pulse, flow into the flow V of fluid of the piston head side 20b of hydraulic cylinder 20 20bFlow V with respect to the bar side 20a that flows into hydraulic cylinder 20 20aReduce at once, so that generate the load shedding pulse.
Preferably, the flow of the piston head side 20b by at first will entering hydraulic cylinder reduces to a certain degree, and the flow that after this will enter piston head side 20b behind certain hour section t returns to previous level and carries out and carry load shedding and reset pulse.After this flow of the piston head side 20b by at first will entering hydraulic cylinder is increased to a certain degree, and the previous level that the flow that after this will enter piston head side 20b behind certain hour section t returns to it is carried the load reset pulse.The result of this operation is that shown in the bottom view of Fig. 3 A, the piston 22 of hydraulic cylinder is applied to the pressure load K of the roll nip on the support bar pElapsed time, section t1 dropped to stress level B from stress level A.
The flow that enters the piston head side 20b of hydraulic cylinder utilizes that of digital valve unit 100/those digital valve pack to reduce, and digital valve pack is used to regulate the streamline 6 of the piston head side that extends to hydraulic cylinder 20; Flow V in 62 6; 62, and also regulate fluid pressure P thus 6; 62As explaining before, provide the flow V of minimizing by the suitable opening of selecting digital valve pack 10b in conjunction with Fig. 2 B and 2D 62Carry out flow V 62Adjustment.Make the opening of digital valve pack 10b return to opening change state before like this, subsequently.By this program, at first reduced via streamline 6; 62 are fed to the flow of the fluid of the piston head side 20b that loads cylinder, and after short time period (from the measurement that begins of flow change) then, make the flow that is fed to piston side return to its previous level (pulse 1 among Fig. 3 A), in order on the pressure side 20 of equilibrium liquid cylinder pressure; 20b and active side 20; Pressure on the 20a.The load shedding pulse is applied to pressure load K on the support bar to the position of the piston 22 of hydraulic cylinder with to piston pInfluence illustrate by Fig. 3 D and 3E with the mode of example.Fig. 3 C presents is the state before carrying the load shedding pulse only, and the situation of Fig. 3 B for example is during the process of fiber web press polish in the stable state of equilibrium.In equilibrium state, control system continues the balanced instruction F (V) that adjusts for digital valve pack provides; F (V T), digital valve pack 10b presents opening 1 in view of the above A1 20bT, and digital valve pack 10c presents aperture 1 A1 20aTThese apertures with digital valve pack 10b and 10c, the flow V that piston head side 20b that is hydraulic cylinder 20 by the digital valve pack 10b that gets involved and 10c from digital valve pack 100 and piston rod side 20a supply certain equilibrium state 20bTAnd V 20aT, on the piston head side 20b of hydraulic cylinder 20 and piston rod side 20a, establish the fluid pressure P of corresponding equilibrium state like this 20bTAnd P 20aTBe that instruction F (V) is adjusted in digital valve pack 100 supply load shedding pulses (pulse 1) like this, subsequently; F (V 1).According to adjusting instruction, the flow and the pressure of piston rod side remain unchanged, and promptly remain on V 20aT, P 20aTBut the flow of piston head side 20b is at first from the flow V of equilibrium state 20bTBe reduced to V 20b1, this and the fluid pressure P that reduces 20b1Coupling then, after the elapsed time section t1, returns to the flow V of equilibrium state 20bTAnd pressure P 20bTBecause the load shedding pulse, piston 22 is by reducing the pressure load K that is applied to support bar thus pMode advance.
Behind appropriate time t2, measure from the inefficacy (inactivation) of load shedding pulse (pulse 1), by have additional supply of the flow of the piston side 20b (on the pressure side) of hydraulic cylinder 20 at once with respect to the flow of the active side 20a that is fed to cylinder (piston rod side), for the supply of digital valve unit (is used to the K that loads as adjusting instruction p) reset pulse (pulse 2) F (V); F (V 2).Preferably, this is by with the realization of getting off: at first the aperture of digital valve pack 10b that control is fed to piston side 20b by suitable mode is from the aperture 1 20bTBe changed to aperture 1 20b2, enter the flow of on the pressure side (piston head side) of hydraulic cylinder from the flow V of equilibrium state via streamline 62 thus 20bTBe increased to flow V 20b2, after the time period t 3 of reset pulse effective (activation), more changeing back aperture before, i.e. aperture 1 then from allowing high flow with the aperture of digital valve pack 10b 20b2Change back to the aperture 1 of equilibrium state 20bT, this operation also is used for making fluid flow to return to its previous level, i.e. speed V from increasing 20b2Flow V to equilibrium state 20bT(pulse 2 among Fig. 3 A), be used for cylinder on the pressure side with active side on the equilibrium of the fluid pressure that exists.During the reset pulse, the flow of the active side 20a of hydraulic cylinder and fluid pressure generally are maintained constant V 20aT, P 20aTBecause this program, shown in the bottom view among Fig. 3 A, the piston of cylinder is applied to support bar and reaches the pressure load K that further is applied on the roll nip pElapsed time, section t3 was increased to stress level A from stress level B, and the pressure load of roll nip returns to the level that exists before load shedding pulse and the reset pulse of carrying.
Be under the situation of glazing calender 500 (calender shown in Fig. 2 A) that the roll nip N of some is arranged at calender, the pulse of load load shedding and the reset pulse of continuous roll nip are adjusted phase place by this way: promptly, make that the joint forward direction between two fiber webs does not change press polish speed by all roll nip N that comprise in the burnishing process.
100 pairs of digital valve unit act on load load shedding that the hydraulic cylinder 20 of the support bar 3 that the end of each intermediate calender rolls exists causes and the actual influence and the influence of reset pulse postpones fluctuation slightly, this depends on the pressure loss in pipe and the pipe-line system, and the architectural difference in the support bar 3 of hydraulic cylinder 20 and coupling with it, and the factor of other such particular roll (with respect to bottom roller and top roller, cylinder 20 is loading cylinders that the upright position of pair roller has a direct impact).In the case, adjust load load shedding (relief) pulse and reset pulse phase place with respect to each speed of service of calender 500, for example can carry out in such a way, the load shedding pulse that the pressure load of the 100 pairs of support bars in measurement digital valve unit and the pressure load of further pair roller cause and the influence and the delay of reset pulse, and if desired, adjust pulse opportunity (timing) and flow by the mode of particular roll.
On the other hand, when expectation used the hydraulic cylinder 20 of digital units control to open roll nip N between two rollers immediately, for example the paper web as Fig. 3 F interrupted H; During Wk process roll nip, arrive the 20b on the pressure side of hydraulic cylinder 20 and the flow V of active side 20a by change 20b, V 20aBetween ratio carry out the high speed load shedding of the nip pressure in the roll nip, 20 pairs of support bars that are present in the roller of roll nip of hydraulic cylinder are exerted pressure.Fig. 3 G illustrates the flow distribution of the fluid of the piston head side that is fed to the hydraulic cylinder that support bar is exerted pressure, and the flow of the active side of hydraulic cylinder almost remains unchanged simultaneously.Realize that like this (this element for example is the piston head that rises the hydraulic cylinder of bottom roller, the housing of intermediate calender rolls by the element with the hydraulic cylinder coupling, it is by loading the cylinder pressurization, the support bar that perhaps is present in the end of intermediate calender rolls, and by the piston pressurization that loads cylinder) the loading effect that is applied on the top roller of roll nip or calender or the bottom roller and is devoted to the position of the roller among the roll nip N reduces immediately.As defective W k(interrupting as paper web) by the fluid pressure that reduces fast with respect to the fluid pressure that exists on the piston rod side to exist on the piston head side of hydraulic cylinder, at first uses the upright position (step 1) among Fig. 3 G of the roller of initial acceleration change rapidly when arriving roll nip.In order to change the ratio of fluid pressure, according to Fig. 3 G, the flow (and fluid pressure) of the digital valve pack 10b of the on the pressure side 20b of forward direction by supplying fluid to cylinder 20 is from the flow V of equilibrium state 20bTFluid pressure P with coupling 20bTLoad shedding is to certain preset flow V 20b1Fluid pressure P with coupling 20b1, therefore realize the pressure load K that hydraulic cylinder produces pThe suitable value of being reduced to K P1Flowing ports 1 by restriction digital valve pack 10b establishment ASize, by selecting the suitable aperture 1 of correlated digital valve group 10c A1 20b1Reduce flow, so that described lower flow rate V to be provided 20b1Simultaneously, be fed to the flow V of the piston rod side 20a of cylinder 20 20aCan be at once from the flow V of equilibrium state 20aTBe increased to new higher volumes flow V 20a1, so that with respect to equilibrium state (P 20a1＞P 20b1) the fluid pressure P of the last existence of on the pressure side (piston side) 20b of cylinder 20bTIncrease the back pressure P that exists on the piston rod side 20aTherefore, the element of the roller that 22 pairs of backer roll nips of piston N exists () loading effect reduces in the case, the intermediate calender rolls support bar, and the upright position of roller such as Fig. 3 G describe change to position E from position D.After this initial acceleration, shown in the top view of Fig. 3 G, pressure P 20bAnd P 20aBetween the difference flow of having additional supply of the hydraulic fluid of piston side 20b by step-wise manner reduce, and can be fed to the flow V of bar side 20a simultaneously by slight minimizing 20aAnd reduce.As a result, the loading effect K of hydraulic cylinder 20 pair roller pressurizing members and roller self will further be reduced p, but carry out with speed and step-wise manner more slowly, and similarly, the upright position of roller with as the described step-wise manner change of the bottom view of Fig. 3 E.The fluid pressure P that the piston head side 20b of hydraulic cylinder 20 and piston rod side 20a exist 20bAnd P 20aBetween pressure reduction by having additional supply of the flow V of piston head side 20b 20bAnd it is balanced gradually, and, make it become equal by the piston side 20b of adjustment hydraulic cylinder 20 and the fluid pressure of active side 20a, the control of the ladder of the upright position of roller and simultaneously opening before roll end is stopped up of roll nip N be stopped, the flow surveyed of piston side and bar also has and identical ratio before roll nip is opened thus.In final equilibrium state, fluid pressure P 20bTnAnd P 20aTnFluid pressure P than the existing equilibrium state of beginning of roll nip N opening procedure 20bTAnd P 20aTLittle.
The high speed opening process of control roll nip N is implemented by the direct control of the flow of the different digital valve group 10 of digital valve unit forward direction according to pre-flow distribution of establishing, and each roll nip of calender is implemented the adjustment of high speed opening when roller/calender uses first.If need, the distribution change of carrying out the flow that is fed to the not homonymy that loads cylinder on the based measurement can examined.
Immediately open the pressure load K of the piston 22 of the hydraulic cylinder that takes place in the program pFurther be shown in further detail in Fig. 3 H with the above-mentioned change of position.Schematically describe another support bar press cylinder 20 among Fig. 3 H, it is present in the end of the intermediate calender rolls of glazing calender, and the control of hydraulic cylinder 20 is implemented in the digital valve control system shown in Fig. 2 D and Fig. 3 B-3D not long ago by similar.At equilibrium state (lower state), generally before high speed opening, during pressure load constant continuous burnishing process, there is the pressure load K of equilibrium state PTOn the piston head side of hydraulic cylinder, exist by flow V 20aTThe fluid pressure P that establishes 20aTParticularly, at hydraulic cylinder on the pressure side, promptly piston rod side 20b in the drawings exists by flow V 20bTThe balanced attitude fluid pressure P that establishes 20bTIn equilibrium state, the digital valve unit is by the adjustment instruction F (V) that can be feedback-type; F (V T) control.(step 1) of Fig. 3 E, digital valve unit have been supplied and have adjusted instruction F (V) when the high speed initial acceleration changes when the upright position of roller; F (V 1), on this basis, forward direction by carry fluid to the flow (and fluid pressure) of the digital valve pack 10b of the 20b on the pressure side of cylinder 20 by the flow V of digital valve unit from balanced attitude 20bTFluid pressure P with coupling 20bTBe reduced to predetermined V 20b1Fluid pressure P with coupling 20b1, realized the pressure load K that hydraulic cylinder is established pPressure load K from balanced attitude PTBe reduced to lower pressure load K rapidly P1Simultaneously, be fed to the flow of piston rod side 20a of cylinder 20 from the flow V of balanced attitude 20aTBe increased to the flow V of new higher rate 20a1, with fluid pressure P with respect to the last existence of on the pressure side (piston side) 20b of cylinder under the equilibrium state 20bTIncrease the back-pressure P that exists on the piston rod side 20aFollow by the piston head side 20b of hydraulic cylinder 20 and the fluid pressure P of the last existence of piston rod side 20a 20bAnd P 20aBetween the staged equilibrium of pressure reduction, shown in Fig. 3 E.For this reason, give the digital valve unit and adjust strings of commands F (V); F (V 2), F (V 3) ... F (V n), be used at pressure load K pBy the step-wise manner load shedding is Kp2, Kp3..K PnThe time, have additional supply of the flow V of piston head side 20b 20b, and can be used for reducing simultaneously the hydraulic fluid flow V that is fed to piston rod side 20a 20aThe pressure load of the balanced attitude that the ending of the opening procedure of roll nip N exists is K Pn, it is in fact less than the pressure load K that exists before the opening procedure Pt
In a kind of modification of the present invention, the high speed opening of roll nip is carried out by so-called mixing control, wherein in the initial acceleration stage of roller opening procedure (for example steps A among Fig. 3 E), the bigger change in the loading cylinder of relevant volume fluid stream utilizes digital valve pack to adjust strategy with feedforward and carries out rapidly.After this staged more slowly of roller continues to open, and wherein flow is more not remarkable in the change of the not homonymy that loads cylinder, can carry out by using the feedback model of adjusting with conventional spool valves.
Suppress vibration
In response to the machine parts of motion, paper machine causes resonance in some parts, the speed of service that this can damage paper machine equipment and reduce paper machine.
In some speed of roller, multi-roller rolling chance experience so-called stupefied effect (barringeffect) is at continuous a plurality of rollers initiation resonance of calender.Playing stupefied effect usually is the result who is present in md orientation (md-directed) defective on the fiber web.It is unfavorable to the coating of the roller that is coated with polymer to play stupefied effect.
Current transfer sheet technology (film transfer technique) is one of most popular paper and coating, top sizing (surface-sizing) and painting methods of cardboard.Transfer sheet technology comprises uses application apparatus to form film on roller, and film is transferred on the surface of fiber web of the roll nip between roller and the reverse rollers thereof.In transfer sheet technology, especially in the high-speed cruising of fiber web, the defective on roller surface can cause resonance in the roll nip between roller and the application block (application bar), causes the muddiness of coating or surperficial sizing material (surface size) and/or film reaching the inhomogeneous distribution on fiber web thus on the roller.
Now, the process that goes up the coiling paper web in storage spool (storage reel) generally comprises the use winder unit, wherein on storage spool, and simultaneously storage spool utilizes the metal tape that drives between two rollers to support to paper web from below via the roll nip forward direction between storage spool and the breast roll (breast roll).The incident that breaks down to storage spool from the defeated neck of breast roll (feeding) paper web, paper generation defective on the storage spool, this may cause the further upset of paper feed, because the defective resonance that exists in the paper bowl that breast roll and/or storage roller support endless metal belt begin to carry with storage spool.
Under all these situations, can utilize device of the present invention and use therein method to suppress resonance.
Therefore, the method according to this invention is based on following program, for example utilize the pressure measxurement that links with roll nip, on the surface of roller or be about to arrive the position that identification causes the defective H of vibration on the fiber web of roll nip, and estimate or calculate defective to arrive moment of roll nip and defective the time of staying in roll nip.After this, when the trouble point arrived roll nip, the pressure utilization precognition feedforward in the nip was adjusted and is reduced at once.It is to utilize the supporting/compression motion dwindle the roller by the hydraulic actuator got involved and/or the supporting/pressurizing member of its reverse rollers to implement that pressure reduces, one or more digital valve pack couplings of the hydraulic actuator of intervention and the flow that is used to control to hydraulic actuator.In describe establishing glazing calender when the load shedding pulse of the pressure load of roll nip and reset pulse, the load shedding at once and described load the resetting in roll nip that are applied to the load on the support component 3 with the hydraulic actuator 2 of digital valve pack 100 couplings are carried out according to for example be similar to the mode that has illustrated in Fig. 3 A-3E.
The compensation of band distortion in the long-nip calenders
A kind of calender of the soft calendaring that is used for fiber web of Shi Yonging is so-called boots formula calender now, wherein wants the fiber web of press polish to transport long nip press that establish and that be provided with endless belt (endless belt) between the reverse rollers (being generally heatable hot-rolling) of crust and the relative boots formula roller thereof to.If the endless belt that extends around the boots formula roller that uses in the boots formula calender or relatively the surface of the reverse rollers of boots formula roller because wearing and tearing and become thinner than remaining structure in some zone, when thin point of each endless belt or reverse rollers arrived roll nip, web of material W became in long nip press by press polish to less thickness.The part of the boots formula calender that is is generally worn and torn is the endless belt (for example, the polyurethane band of fabric reinforcement) in the rotation of the boots formula element top of boots formula roller, and reverse rollers suffers wearing and tearing so not general.
The objective of the invention is to eliminate aforesaid drawbacks about finding in the long-nip calenders.
The inconsistent press polish of web of material W can and use the device of the inventive method to get rid of by method of the present invention.In this method, hydraulic actuator for example applies the hydraulic cylinder of load on the boots formula element of boots formula calender, with one or more digital valve pack couplings.This method is based on following program, when each thin point that exists in endless belt or its reverse rollers of boots formula calender rotates into long nip press, the load of hydraulic cylinder that adds pressure shoes formula element is with load shedding, and behind thin some process long nip press, the load that adds the hydraulic cylinder of pressure shoes formula element will reset to its previous level.
Will be with reference to figure 4A and the present invention of 4B more detailed description.
Fig. 4 A schematically shows the boots formula calender of directly observing at end face.
Fig. 4 B illustrates the long nip press of Fig. 4 A of magnification ratio.
Schematically describe the typical boots formula calender 800 that does not have lubricating system among Fig. 4 A.Fig. 4 B and then endless belt 8a on the boots formula roller 8 of long nip press N is shown, for example the point that reduces of the thickness of the fiber web W of paper web is positioned on the endless belt 8a.
Boots formula roller 8 comprises the boots formula element 8b that can load, apply load on the boots formula element among the roll nip N of hydraulic actuator 2 between boots formula roller 8 reverse rollers 80 relative with it, also be included in the endless belt 8a that rotates on the boots formula element, and be located at the lubricating system (not shown) between boots formula element 8b and the band 8a.Hydraulic actuator 2 shown in the figure is by two hydraulic cylinders 200 side by side; 200 ' and 200; 200 " form, hydraulic cylinder row (row) is along extending to the other end perpendicular to the direction (CD direction) of machine direction (MD direction) from an end of boots formula element.Each hydraulic cylinder row 200; 200 ' and 200; 200 " be subjected to their digital valve unit 100; 100 ' or 100; 100 " control.The operation of digital valve unit 100 is synchronous by control system 4.Digital valve unit 100 ' and 100 ' design, each hydraulic cylinder row 200 ' and 200 " the operation control by these digital valve unit and the mutual operation of described digital valve unit are by the aforementioned work example according to Fig. 2 D of can being similar to synchronously of control system 4.
In boots formula calender 800, boots formula roller 8 has reverse rollers 80, its reverse rollers 80 comprises the hot-rolling 80 of the heating in the soft calendaring that is used in web of material, the long nip press N of boots formula calender 800 establishes at boots formula element 8b and between endless belt 8a that moves on the boots formula element top and hot-rolling 80 thus, treats that the fiber web W of press polish is transported to described nip.
Distortion among the monitoring endless belt 8a can be carried out at the surface pressing P2 of long nip press N by pressure load P1 and the endless belt that hydraulic cylinder 200 load shoe formula element 8b establish by on-line measurement continuously.Measuring the surface pressing P2 of endless belt in long nip press can be undertaken by using the method for describing among the Finnish patent file FI-20055020 for example.Calculating pressure between roller nip pressure load P1 and the endless belt surface pressing P2 falls the thickness that dp=P1-P2 can detect endless belt 8a and reduces process and locate the point that thickness reduces.Subsequently, make control system 4 calculate suitable adjustment instruction F, in order to the some H that reduces at the thickness that calculates endless belt 8a; H tReduce nip pressure when no matter when arriving roll nip N by the digital valve unit of getting involved 100.
Therefore, in the process of the duration of calculating the load shedding pulse and the zero hour, the rotary speed, long nip press N that control system 4 is considered endless belt 8a at least reduces thickness and the surface area of a Ht at the thickness of the length of machine direction and endless belt.As the description of correlation diagram 3A-3D is explained in more detail, by be load shoe formula element 8b and with the hydraulic actuator 2 of digital valve pack/a plurality of digital valve pack 100 couplings, for example hydraulic cylinder 200, suitable timing and load load shedding pulse that rationally continues and load reset pulse are provided, and the nip pressure load shedding is also resetted once more.Load shedding pulse and load reset pulse at first make hydraulic cylinder 200 reach thus on boots formula element 8b, and the pressure load on roll nip N reduces, after the appropriate time section that the load shedding pulse of associating begins, make the nip on-load pressure reset to its initial value by reset pulse.
Because the delay that takes place in the hydraulic actuator 200 (for example seeing the bottom view of Fig. 3 A), the some H that reduces at thickness a little at the action of load shedding nip pressure with digital valve pack; H tBegin before rotating into long nip press N.The load shedding pulse of hydraulic actuator 200 provides by following: as described in Fig. 3 A-3E, enter with respect to the digital valve unit hydraulic actuator the bar side flow and change (reducing) fluid from digital valve pack 100; 100 ' or 100; 100 " enter the flow of the piston side of hydraulic actuator, and, immediately flow is reset to the level that exists before changing by closed and open valve suitable in the digital valve pack of digital valve unit 100.Flow load shedding pulse that the valve of digital valve pack is assigned with realize that the piston by hydraulic cylinder 200 is applied to that boots formula element 8b goes up and further the pressure on the endless belt 8a of the boots formula element in the zone that rotates into long nip press N reduce; Reduce because rotate into the Ht segment thickness of endless belt 8a of the scope of long nip press N, endless belt 8a is applied to pressure load on the fiber web W level before still remaining on it in long nip press N.The point H that reduces at the thickness of endless belt 8a a little tTrailing edge leave before the zone of long nip press N, with the action of digital valve unit 100 beginning at the pressure load of the boots formula element 8b that resets.For this reason, as the explanation associated description of Fig. 3 A, the fluid stream that enters the piston side of hydraulic actuator 200 increases with respect to the flow of the bar side that enters hydraulic actuator, and utilize the suitable aperture of the digit groups of digital valve unit that the ratio of flow is reset to its initial value (and simultaneously, the fluid pressure that exists on each side of the piston of each hydraulic cylinder resets to the equal fluid pressure that exists in the lower state) simultaneously.Because the load reset pulse that digital valve unit 100 gives, the region memory of long nip press N are the pressure load of the hydraulic actuator 200 on the boots formula element 8b and will reset to the level of the lower state that exists before the load shedding pulse.
Go up the load load shedding and load resets (or the load load shedding and the load that in fact are applied on the boots formula element 8b that exists under the endless belt 8a reset) for the endless belt 8a that rotates among the above-mentioned long nip press N, the control system 4 of digital valve unit 100 is provided with at least the some H that reduces at the thickness of the length of machine direction and endless belt 8a about the rotary speed of the speed of service of fiber web W and/or endless belt 8a, long nip press N tData in the length of machine direction.In addition, control system 4 is provided with about hydraulic actuator 200 and is applied to the pressure load on the boots formula element and the data of the change that the load of endless belt 8a distributes in long nip press N.In these parameters, the speed of service of the length of long nip press N, fiber web W and the rotary speed of endless belt 8a can obtain and/or known in advance in addition by measuring.The point H that the thickness of endless belt 8a reduces tLength and the point that reduces of described thickness with respect to the thickness of other thickness of endless belt, and the point that thickness reduces obtains on the based measurement of describing not long ago in the length of long nip press N vertical (machine direction).The degree that the reduction that requires in the method for the present invention is applied to pressure (compression force) P1 on the boots formula element 8b by the piston of hydraulic actuator 200 depended on endless belt with respect to the residue endless belt attenuation that does not reduce thickness what.Because enter hydraulic actuator 200 on the pressure side cause the piston of hydraulic actuator 200 to be applied to boots formula element 8b going up and certain change of the pressure on endless belt 8a thus with the change of the flow of the hydraulic fluid of active side, so the change of required pressure (compression force) can be used as according to experience and/or calculating and/or table look-up and find out the basis of the required parameter of adjustment program, change the volume hydraulic fluid stream in the digital valve unit 100 that is coupled with hydraulic actuator 200.Point out that as above the flow of each digital valve pack of flowing through depends on the aperture 1 of digital valve pack A, promptly depend on open mode digital valve port the gross area and arrive pressure reduction (seeing Fig. 2 D and relevant description) between the fluid of concrete digital valve pack and the fluid that passes through same digital valve pack.Pass the aperture 1 of concrete digital valve pack APressure reduction obtain by measurement or can predict easily in addition.As a result, control system 4 can distribute according to concrete adjustment and calculate the quick feedforward adjustment instruction of concrete time period, reduces the loading of endless belt 8a, and at defective H; H tThrough loadings that resetted behind the long nip press, control system 4 on the pressure side and/or on the basis of the flow that will reach on the active side is selected digital valve unit 100 at the hydraulic cylinder of expecting 200 thus; 100 ' or 100; The flow of those Hydraulic Elements 100 " is adjusted digital valve pack; make it possible to produce load load shedding pulse and the reset pulse consistent with adjusting instruction; after this, on the basis of the change degree of expecting, selects those digital valve of opening with special time from these digital valve pack.As mentioning not long ago, boots formula element 8b and thus the load of endless belt 8a the load shedding pulse and depend on the point (H that the thickness of endless belt reduces the time lapse (lapse) between the reset pulse; H t) length and the length of long nip press.
Lubricated
One embodiment of the present of invention are based on the lubrication oil circulation of utilizing one or more digital valve pack to realize bearing.
In the paper machine in modern times, by make oil in the bearing arrangement of roller wet end, drying section and finish in the portion circulation and carry out lubricated.Other bearing arrangements of the instrument of paper machine and motor, for example the bearing arrangement of fan, barking drum (barking drum), refiner (refiner), mixer, coating machine, up-coiler and cutting machine can provide lubricated by recycle oil.The lubricated life-span that mainly is used to prolong bearing arrangement of the recycle oil that uses in the paper machine is because the purity of lubricating oil is most important to the life-span of bearing.
Being exemplified as of the current paper machine roll that is provided with circulating oil lubrication:
-vacuum furnace (suction roll), it is positioned at the silk screen portion of green end, and has the roller shell of rotation, and utilizes planetary gear to drive.The most general bearing that the suction side of vacuum furnace and driving side use comprises the ball ball bearing, and oil is generally conducted to bearing centre.
-at press section (press section), when being supported by woollen blanket, the roll nip of fiber web between pressure roller advanced, and the most of moisture that still is included in the width of cloth material removes in squeezing.In most of the cases, active side of pressure roller (service sides) and driving side all are provided with the ball ball bearing.In the case, oil also typically conducts to bearing centre, and removes from the either side of bearing and to enter gathering room, leaves bearing body via the outlet that forms on the bearing body then.Quantitative (dimensioning) of oil circulation is subjected to the design temperature of bearing arrangement and the level affects of lubricating oil especially.On the other hand, the temperature of bearing arrangement is subjected to the influence of diameter, rotating speed and the weight of roller.
-in burnishing process, the surface quality of fiber web is promoted in order to print.The glazing calender that is used for the soft calendaring of fiber web comprises some stacked deflection compensations roller (deflection compensated), that be coated with polymer, and heatable hot-rolling, the roll nip that is used for the fiber web press polish simultaneously is made up of the pair of rolls that comprises hot-rolling and the roller that is coated with polymer relative with it.The influence of the humidity of the nip load that actual burnishing process is subjected to exist in each roll nip especially, the temperature of hot-rolling and fiber web.The nip load that ground exists such as have not because be present in roll nip in the roll stacks of glazing calender, when the bearing arrangement of design roller, be necessary to consider roller in roll stacks the position and roll nip in the nip load that exists.Because even the roller of the roll stacks of same glazing calender is also usually at different modes of operation, it is quantitative that the flow velocity of the circulating oil lubrication that also requires to bring into each bearing and remove from bearing body is pressed the specific mode of roller and bearing, thus with regard to its design work, the bearing arrangement of the roll stacks of the glazing calender effort that may become.Typically, in fact the quantity adjustment of the lubricating oil of each bearing must be realized by the feedback that the ellipse wheel got involved or turbine are measured.In glazing calender, the most general bearing type comprises the ball ball bearing.
Current in some parts of paper machine, the circulation of lubricating oil is to implement with the analog regulation valve, is like this in the bearing arrangement of pressure roller and calender roller, also is like this in other bearing arrangements of paper machine instrument and motor.The roller of paper machine generally is provided with the spherical ball ball bearing, and simultaneously typical roller comprises the deflection-compensated roll of green end calender.In the circulating oil lubrication of realizing with analog valve, the feedback adjusting that the oil that provides for each bearing is provided separately quantitatively and planning, bearing arrangement and lubricatedly may become complicated and expensive thus.
The circulation of controlling lubricating oil with one or more digital valve pack of digital valve unit has realized that Billy implements the substantial advantage of loop control with analog valve.Therefore, the bearing in the device that is placed in glazing calender is for example distributed in the digital valve unit formed via one or more digital valve pack of lubricating oil.Preferably, each bearing has the particular value unit that is assigned to this, is used for distributing the required lubricants capacity of bearing in the concrete time.The volume circular flow of the lubricating oil that the different bearing arrangements of paper machine are required and the change degree of flow make the digital valve pack of the digital valve unit of each bearing of service have 3 to 6 digital valve that are connected in parallel expediently.The aperture of the digital valve pack of the lubricating oil dosage of bearing by changing into the bearing fuel feeding guides suitably.If for example the lubrication oil circulation of the device of glazing calender utilizes the digital valve unit of specific bearing to realize, can guide the fuel feeding of digital valve unit by mode, promptly via the public input line 7 in digital valve unit with Fig. 2 D equivalence; 71.
Self does not comprise the dosage control of lubricating oil the digital valve unit, but only act as dose dispenser.If the lubrication oil circulation to the roller that for example is applied to glazing calender is controlled, can control the required oil mass of all bearings of calender by the independent control system of centralized system utilization and the coupling of digital valve unit by using adjustment strategy based on feedforward.Control system is used to calculate each bearing at concrete constantly required lubricants capacity, for example on the basis of the measurement data of the relevant bearing that obtains, and the suitable digital valve that comprises of the digital valve pack that is used for being opened for the digital valve unit of bearing fuel feeding, so that the flow of lubrication of expectation is provided for bearing arrangement.Control system is adjusted rapidly because of feedforward.Therefore, control system can be a specific device, and specific calender for example is not because need to be the specific lubrication oil circulation of each design bearing.Since the lubrication oil circulation control system is bearing specific device rather than specific, control system becomes simpler and more attractive with regard to expense.The lubrication oil circulation of utilizing the digital valve unit to realize if any expectation also can have the feedback of coupling with it, for example feed back by the flow measurement of the current use that gets involved, yet even without feedback, lubrication oil circulation also is very practicable.Adjustment realizes that by the digital valve unit of getting involved the dosage of the oil lubrication of circulation provides the oil-feed control of suitable simplification, also can accomplish even be transported to when the lubricants capacity of bearing changes.As the accurate and fault tolerant of being realized in describing of oil-feed control.
Drum send the adjustment of output Compressed Gas
In a scheme, when the present invention relates to the grade (papergrade) of paper pending in changing paper machine, especially adjust compressed-air actuated drum in the wet web pickup and send output.Passing in the end of conveying fiber width of cloth material especially need be at the wet web pickup of fiber web in the process in the unsupported space in press polish, coating, squeezing and the coiling.When changing the grade of paper, be necessary for paper machine many air sprayer pistols that various outputs are arranged are provided.At present, the output that adjustment air drum send guides by using resistance valve, and actual from the meaning resistance valve that is merely able to rouse the output of sending air in the specific narrow range adjustment of flow at every turn is specific fan.In resistance valve, the air forward direction is by the pipe nipple circulation road.The flow of process valve port depends on the pressure reduction on the valve port either side, and the surface area of port.Flow that exists on the either side of port and air pressure are regulated by the size of adjusting the throttling path in resistance valve.It is coarse sending with the high air drum of exporting of this simulation resistance valve adjustment, with regard to the energy, waste, and also expensive.
Being used for drum send compressed-air actuated embodiments of the invention to be intended to eliminate the shortcoming that aforementioned prior art exists.
The purpose of this invention is to provide the method and apparatus that is used for especially adjusting the output that the compressed air drum send in the feeding process of fiber web.
The method according to this invention and device can be realized aforementioned purpose.
Method according to this embodiment of the invention depends on by digital valve pack and carries compressed air, digital valve pack to be present in compression air flow channel and comprise side by side 2 to 8, be generally 3 to 6 digital close/open valves.The size of the valve that comprises in the digital valve pack is preferably selected in such a way: promptly, bigger one unit interval air capacity is the twice of having passed through the unit interval air capacity of less valve in the valve with continuous flow through two open modes.
The size in the aperture that digital valve pack is established is adjusted by ON/OFF digital valve suitable in the open and close digital valve pack.Pressure reduction between the air-flow that the area in this aperture is determined to be fed to the air-flow of digital valve pack and to have passed through digital valve pack.Determine through the compressed-air actuated flow of digital valve pack and then on the basis of aperture area and above-mentioned pressure reduction.If suitably selection has the size in the digital valve aperture of continuous diameter, digital valve pack can provide effective adjustment of compressed air stream in the fibrous web wet web pickup, simultaneously, the valve cell that is contained in air flow channel can raise the seamless stream of compressed air at wide range of flow.As the adjustment that the compressed air stream of being realized in describing is exported, significantly reduced the quantity of necessary compressed air stream regulating valuve unit.In addition, adjust air output obviously than more accurate with choke valve with digital valve pack, the energy saving in the wet web pickup process of large-scale paper machine reaches 30% to 50%.
The heat exchanger of digital valve control
In the each several part of paper machine, heat exchanger is essential.One of its necessary effect comprises the lubricating oil of cooling from operation.
The heat exchanger that is used for various effects in the paper machine usually is the oil oil to-water heat exchanger that cooling water moves on primary side moving on the primary side.At present, the adjusting of cooling water cycle rate is to utilize the pneumatic throttle of manufacturer's supply to realize, but is expensive with regard to its purchase cost.Especially at the heat exchanger of cheap scope, it is excessive that cooling sea water regulating valve constitutes the part of totle drilling cost of heat exchanger, just forces and use the valve that is fit to this concrete heat-exchange apparatus.Yet, when originally use is not that from the efficient of the energy and water, these valves are inferior to those usually and are the specially designed valve of above-mentioned actuator when being designed for the adjusting of the adjustment valve of this concrete heat exchanger realization cooling water circulation.It is all the more so when the primary side fluid of this valve common inaccuracy, the especially low speed that takes place when having the instrument cold start-up with regard to adjusting performance flows.
The present invention is intended to eliminate the shortcoming that exists in the prior art.Therefore, the purpose of this invention is to provide fluid-fluid heat exchanger, wherein the fluid circulation regulating system of secondary cycles is attractive as much as possible and simple in structure with regard to its purchase cost.In addition, heat exchanger provides accurately in the amount of the fluid of advancing on for primary side on the whole adjusting range and adjusts.
With heat exchanger according to the present invention, can eliminate and be present in shortcoming of the prior art.
In heat-exchange apparatus of the present invention, the heat-transfer fluid that be fed to for example water in the primary side of heat exchanger is carried via digital valve pack.Depend on the flow that primary side is required, digital valve pack has 2 to 8, is preferably 3 to 6 ON/OFF digital valve that are connected in parallel.
On the supply side of heat exchanger, use digital valve pack to be provided at low flow velocity and all adjustings accurately of high flow rate as heat exchanger.ON/OFF digital valve outside identical, only different on the diameter of their flow passage aperture each other, the investment cost of digital valve pack is lower in fact more in the past than the investment cost that the control valve of the particular actuators of using causes thus.About the additional benefit that heat exchanger of the present invention obtains, it should be noted that because heat exchanger can be adjusted its secondary effluent amount in wide scope, so same heat exchanger can be used in numerous items.
Heat exchanger according to the present invention is more carefully described with reference to figure 5.
Fig. 5 has schematically shown oil to-water heat exchanger of the present invention.
Visible oil to-water heat exchanger 9 among Fig. 5, wherein the oil in primary side 92 cocycles is the oil that for example flows in lubrication oil circulation.The primary side 9 of heat exchanger; The cooling water and the digital valve unit 100 of supply combine on 91, and digital valve unit 100 includes a digital valve pack 10 of 6 ON/OFF digital valve 1 that are connected in parallel.
Oil water cooling in primary side 92 cocycles, its cooling capacity (flow) must be quantitative in such a way, be that the same water circulation of primary side 91 can make the about 200 ℃ deep fat cooling of temperature, and the oil relevant with the cold start-up of the device that is lubricated by primary side is heated a little.Therefore, water circulation 92 must have boundless range of flow.The flow of the quantity of the digital valve 1 that comprises in the digital valve pack 10 and process digital valve is suitable for mating desired cooling capacity.In the heat exchanger 9 of Miao Shuing, the cooling water of supply is regulated by digital valve pack 10 in the drawings, and digital valve pack 10 is included in 6 ON/OFF digital valve 1 of arranging with the parallel connection relation in the chilled(cooling) water supply (CWS) stream.Flow through the digital valve 1 that is shown in an open position is to select in such a way: promptly, make in the valve of two continuous flows that the flow with valve of big flow port is 2 times of flow of less valve.This digital valve pack 10 that comprises 6 valves provides the ability of establishing 31 kinds of different cooling water flows, and potential flow begins to expand to big tens times cooling water flow (maximum 1V+2V+4V+8V+16V+32V=31V) from various little flows (flow V=1).
The pressure load adjustment of the loading element of backer roll member
Open or partially open that Adjustment System based on the digital valve unit is used to replace the feedback-type Adjustment System of current closure is practicable, current closed feedback type for example is adjusted at so-called drive roll press polish or scatters and is based on simulation in the process of fiber web and adjusts valve.Here the drive roll of mentioning is to be provided with to make surface profile along the inside of the roller joint of vertical change of roller or the roller of external load element.
Fig. 7 illustrates the pressure adjustment of carrying out loading element with digital valve unit 100, digital valve unit 100 on roller, apply load and with the coupling of the piston rod of hydraulic cylinder 20.Roller is for example so-called Sym roller (Sym-roll) that is provided with several inner rollers (intra-roll) loading element, or has the roller of the hydraulic cylinder coupling of loading element on stub shaft (stub shafts) and the piston head.
In order to compare, Fig. 6 illustrates loading element and apply load adjustment pressure K internally on the roller surface pCorresponding legacy system.Adjustment System comprises uses closed (feedback-type) Adjustment System to control pressure load K with the loading element of piston 22 couplings of hydraulic cylinder 20 p, the wherein change of carrying out pressure load by the simulation adjustment valve and the pressure regulator of use prior art.Wherein, give pressure regulator one target pressure value Pref by for example potential information.For example utilize electronic sensor or, lead to the pressure P that exists in the line 6 of hydraulic cylinder 20 alternatively by hydromechanical mode 6Continuously or measured by the slip end face that pressure is conducted to valve with specific interval.Therefore, pressure regulator receives information about the difference between target pressure value Pref and the pressure P tot that measures from line 6 continuously or with specific interval, and use on this basis adjust instruction P instruction continue to correct the adjustment valve slider to the pressure P tot that makes measurement as much as possible near the position of goal pressure Pref.The position adjustment of slide block can be carried out or the execution of hydrodynamics ground by electronic electronic and actuator, for example utilizes spring.The problem of this traditional Adjustment System is its instable risk.Problem is so-called closed Adjustment System, and the stability of this system depends on pressure regulator especially and adjusts parameter, and the dynamic performance of depending on loading element, pipe-line system and adjustment valve.Unstability makes the pressure load K that himself shows as loading element pFluctuation and when paper is being provided with in the roll nip of roller press polish, worsen for example vibration of the quality on paper surface, pressurize internally with this loading element in the surface of its central roll.Adjustment System also may be unnecessarily in response to the intermittent pulse that is caused by the rotation of roller.
Fig. 7 illustrates and utilizes 100 pairs of digital valve unit to be applied to the lip-deep pressure load K of roller by a loading element that comprises in the roller component pMethod of adjustment, roller component is for for example being provided with the roller of inner loading element.Digital valve unit 100 comprises two digital valve pack 10.Be fed to the flow velocity V of stream of the 20b on the pressure side of hydraulic cylinder 20 via streamline 6 6With fluid pressure P 6By digital valve pack 10; 10 pressure (a digital valvegroup 10; 10pressure) regulate.On the other hand, from the forward direction of 20b on the pressure side of hydraulic cylinder to tank line 7; The flow velocity of 72 stream and pressure are by digital valve pack 10; 10 return (a digital valve group10; 10return) regulate.The pressure in the adjusting streamline 6 and the digital valve pack 10 of flow velocity; 10 pressure and adjusting are transported to the pressure P of the fluid in the tank line 6With flow velocity V 6Digital valve pack 10; 10 return all and comprise: have the unequal ON/OFF digital valve that is connected in parallel through the N example of inflow-rate of water turbine (flow-through) at open position.Each digital valve is opened fully or is closed fully.In control from streamline 6 to tank line 7; The digital valve pack 10 of 72 stream; 10 return and control from tank line 7; 71 arrive the digital valve pack 10 of the stream of streamline 6; In 10 pressure, the quantity N of digital valve can not wait.In digital valve pack 10; In 10 pressure, relative to each other the quantity through the unequal ON/OFF digital valve of inflow-rate of water turbine is N.The aperture 1 of digital valve pack 10 ABe the summation that in the special time digital valve pack, controls to the digital valve of open position, and can only obtain the specific discrete value.When digital valve pack has the ON/OFF digital valve that the N example do not wait, aperture 1 A1 A pressure energyEnough obtain 2 NThe individual opening combination and the aperture of dispersing of not waiting.Therefore, forward direction is through obtaining 2 NThe individual discrete state digital valve pack 10 that does not wait; The stream of 10 pressure depends on aperture 1 A1 A pressureBecause each digital valve in the digital valve pack is opened fully or complete closure, so each aperture 1A can obtain high accuracy.Thus obtained advantage is that digital valve pack can remove uncertainty, and for example adjusts related hysteresis and the zero creep (zero creep) of valve with simulation.
Depend on via tank line 7 through the flow rate of fluid that enters line 6 via digital valve pack in the concrete time; 71 arrive the supply pressure Ps of the fluid of digital valve pack, and depend on the aperture 1 of the digital valve pack of concrete time; 1 A pressure Specific aperture 1 A pressure, 1 A pressure 1, 1 A pressure 2... 1 A pressure NThen with the specified pressure of loading element load Kp; Kp1, Kp2...KpN coupling because pressure load Kp is arranged on such pressure, that is, makes and has passed through digital valve pack 10; The flow of 10 pressure equal forward direction by with the flow of the head of the piston 22 of loading element coupling.These pressure loads can draw by enough two optional models:
-Mathematical Modeling, wherein Mathematical Modeling produces between digital valve pack and loading element, and model is used to calculate coupling digital valve pack 10; The different apertures 1 of 10 pressure A1 A pressureThe pressure load Kp of loading element, perhaps
-empirical model, it comprises measures coupling digital valve pack 10; Each aperture 1 of 10 pressure A1 A pressureThe pressure load Kp of loading element.After this so-called calibration measurement, no longer need to measure the pressure that leads to hydraulic cylinder from line 6.
Mathematical Modeling and empirical model in fact all provide a description the model of the Adjustment System of being made up of hydraulic cylinder and digital valve unit 100, and this model can define the digital valve pack 10 with the fluid stream of controlling the 20b on the pressure side that enters hydraulic cylinder; The various different apertures 1 of 10 pressure A1 A pressure, 1 A pressure 1, 1 A pressure 2..1 A pressure NThe pressure load Kp that obtains.After this, utilize these models, can select aperture 1 near goal pressure by the pressure load Kp that makes the aperture limit (aperture-defined) A1 A pressureAdjust pressure load Kp.The pressure load adjustment can be directed to does not have pressure feedback, promptly need not measure the pressure V in the line 6 that for example leads to hydraulic cylinder 6And not be used on the basis of this gaging pressure and examine aperture 1 AIt is highly important that the repeatably mode that can mate the true pressure load according to the pressure load that model provides fully obtains each aperture 1 of digital valve pack ASelecting correct aperture 1 A1 A pressureThe time, also can utilize technology based on penalty function (penalty function), it can be compromised between the accuracy of quantity that digital valve for example connects and adjustment.
Above-mentioned Adjustment System is not considered inlet flow V 6, P 6Middle supply pressure P sChange, this pressure changes the flow in each aperture of process digital valve pack influential, because flow depends on supply pressure P sWith aperture 1 A1 A pressureBy measuring supply pressure and supposing that for example the pressure load Kp of loading element is constant with the ratio maintenance of supply pressure, can compensate supply pressure P sVariation.
Utilize the pressure Adjustment System of the loading element of the roller component that the digital valve unit establishes also can be as the part of closo or feedback-type Adjustment System.In the case, as mentioned above, the desired value of the pressure load Kp of loading element is at first used the suitable aperture 1 of the digital valve pack that elects A1 A pressureThe basis.Yet present the measurement is that pressure load is carried out, and based on the difference between pressure load of measuring and the goal pressure load, the desired value utilization of pressure load Kp comprises that the closed Adjustment System of the simulation adjustment valve that is coupled with pressure regulator changes.It is the following fact that this hybrid system is compared the advantage that traditional Adjustment System type of proposing among Fig. 6 for example obtains: handle most work with the Adjustment System based on opening model that the digital valve unit is realized, and closed Adjustment System is only handled accurate adjustment and put in order.This is than the existing more stable scheme of known traditional scheme, and whole adjustment operation is handled by closed-system in traditional scheme.
The operation of the above-mentioned Adjustment System of the pressure be used to control loading element is still described in method mode below.
A. do not consider to arrive the basic system that the pressure of the inlet flow of the Adjustment System of being established by hydraulic cylinder, loading element and digital valve unit changes.
1. the desired value of pressure of the active side of pressure load Kp or hydraulic cylinder is provided for Adjustment System.
2. on the basis of the empirical model of describing the Adjustment System of establishing or Mathematical Modeling, determine to enter the aperture 1 of digital valve pack of the warp of institute on the pressure side of hydraulic cylinder with fluid by hydraulic cylinder, loading element and digital valve unit AThe pressure load Kp of the load cell of coupling or the active side pressure of hydraulic cylinder.
3. select best digital valve pack aperture 1 A1 A the best, it also can be corresponding to being the pressure load Kp of loading element or being the desired value of the active side pressure setting of hydraulic cylinder.
4. controlled those digital valve of opening in the digital valve pack provide the optimum aperture 1 of digital valve pack A the best
5. in leading to the circuit of hydraulic cylinder, the optimum aperture 1 of digital valve pack A the bestThe particular flow rate and the pressure of the pressure load Kp of establishment coupling expectation or the active side pressure of hydraulic cylinder.
If B. also consider the variation of supply pressure Ps in the Adjustment System, more than the operation of Adjustment System of 1 to 5 section description should change as follows:
1. the desired value of pressure of the active side of pressure load Kp or hydraulic cylinder is provided for Adjustment System, and supply pressure P sMeasured value.
2. on the basis of the empirical model of describing the Adjustment System of establishing or Mathematical Modeling, determine to enter the aperture 1 of digital valve pack of the warp of institute on the pressure side of hydraulic cylinder with fluid by hydraulic cylinder, loading element and digital valve unit AThe pressure load Kp of the load cell of coupling or the active side pressure of hydraulic cylinder, this model comprises supply pressure P sCorrection term.
3. select best digital valve pack aperture 1 A1 A the best, it also can be corresponding to being the pressure load Kp of loading element or being the desired value of the active side pressure setting of hydraulic cylinder.
4. controlled those digital valve of opening in the digital valve pack provide the optimum aperture 1 of digital valve pack A the best
5. in leading to the circuit of hydraulic cylinder, the optimum aperture 1 of digital valve pack A the bestThe particular flow rate and the pressure of the pressure load Kp of establishment coupling expectation or the active side pressure of hydraulic cylinder.
C. on the other hand, if Adjustment System is the mixing Adjustment System that comprises closed Adjustment System and open Adjustment System, and comprise the pressure that changes the active side of the pressure of pressure load Kp of loading element or hydraulic cylinder with closed Adjustment System, closed Adjustment System comprises for example simulates guiding valve, and after this with to adjust flow be pressure load Kp with the coupling in the digital valve unit or be the new desired value that the active side pressure of hydraulic cylinder is provided with, the operation of this Adjustment System is performed as follows:
1. on the basis of the pressure load of the goal pressure of the active side of the desired value of pressure load Kp or hydraulic cylinder and measurement or the deviation between the active side pressure, utilization comprises the new desired value that the closed Adjustment System of simulating guiding valve is determined pressure load or hydraulic cylinder works lateral pressure, and this desired value offers the open Adjustment System that comprises hydraulic cylinder, loading element and digital valve unit at least.
2. on the basis of the empirical model of describing the open system of establishing or Mathematical Modeling, determine to enter the aperture 1 of digital valve pack of the warp of institute on the pressure side of hydraulic cylinder with fluid by hydraulic cylinder 20, loading element and digital valve unit AThe pressure load Kp of the load cell of coupling or the active side pressure of hydraulic cylinder, this model may comprise supply pressure P sCorrection term.
3. select best digital valve pack aperture 1 A1 A the best, it also can be corresponding to being the pressure load Kp of loading element or being the fresh target value of the active side pressure setting of hydraulic cylinder.
4. controlled those digital valve of opening in the digital valve pack provide the optimum aperture 1 of digital valve pack A the best
5. in leading to the circuit of hydraulic cylinder, the optimum aperture 1 of digital valve pack A the bestThe particular flow rate and the pressure of the pressure of the new pressure load Kp of establishment coupling expectation or the active side of hydraulic cylinder.
Be applied in adjustment under the condition of equivalent pneumatic operation roller component, the above-mentioned Adjustment System that comprises hydraulic cylinder also can use the pneumatic linear actuator of equivalence to realize.

Claims (47)

1. method that is used to handle the defective that takes place during the web of material processing, described method comprises the steps: at least
The position of defective (H) on the surface of-identification roller (5) or in the web of material, and estimate or calculate the time and the time of staying of described defective in described roll nip that described defective (H) arrives roll nip (N),
-feedforward is adjusted instruction (F) and is transferred at least one digital valve unit (100) of the nip pressure that is used to control described roll nip (N) from control system (4), and described adjustment instruction (F) is used for handling the defective of the described roll nip (N) of calender,
-the latest when described defective (H) arrives described roll nip (N), by at least one digital valve (1) that gets involved, according to adjusting the nip pressure that instruction (F) reduces described roll nip (N), and along with described defective is left described roll nip and increased described nip pressure.
2. the method for claim 1 is characterized in that, described adjustment instruction (F) is digital, and for example binary mode, and/or described roll nip is the roll nip that is present in calender, squeezer, drying machine, coating machine or the up-coiler.
3. method as claimed in claim 1 or 2 is characterized in that, in described adjustment instruction (F), determine through the flow of the fluid of described digital valve unit (100) and/or the adjustment period between adjust the position of piston of element (2).
4. each described method in the claim as described above is characterized in that, according to described adjustment instruction (F) by changing aperture (1 of digital valve pack (10) A), promptly, change the volume fluid flow of forward direction by the digital valve pack (10) of described digital valve unit (100) by opening and the digit expected valve (1) of the closed described digital valve pack that is connected in parallel with respect to the fluid stream of process.
5. each described method among the claim 1-4 as described above is characterized in that described method comprises the steps: at least
-in the counter clockwise direction with respect to the web of material direct of travel of described roll nip (N), identification arrives the joint (H that exists in the web of material of described roll nip (N); W s) the position, and two interconnected web of material described joint (H of fiber web (W) for example; Ws) scope,
-estimate or calculate described joint (W s) arrive time of described roll nip (N), and described joint is by the time of described roll nip (N),
-feedforward is adjusted instruction (F) and is transferred at least one digital valve unit (100) of the nip pressure that is used to control described roll nip (N) from described control system (4), is used to handle described joint (W s) defective that causes in described roll nip (N),
-the latest when described joint (Ws) arrives described roll nip (N), by at least one digital valve (1) that gets involved, according to adjusting the nip pressure that instruction (F) reduces described roll nip (N), and, described joint increases described nip pressure along with leaving described roll nip (N).
6. method as claimed in claim 5 is characterized in that:
-described adjustment instruction (F) comprises the load shedding pulse of the nip pressure of roll nip, and wherein the nip of particular roll nip is applied to pressure load (K on the roller support bar (3) by reducing hydraulic actuator (2) p) and reduce, and the load reset pulse, wherein said hydraulic actuator (2) is applied to the described pressure load (K on the same described support bar (3) p) be reset to its previous level,
-nip pressure (N p) the described load shedding pulse and the reset pulse of described nip pressure generate by the digital valve that comprises in the digital valve pack (10) of using digital valve unit (100), in order to respect to the volume fluid flow (V on the not homonymy (20a, 20b) of the piston that arrives described hydraulic actuator (2) in the equilibrium state 20aT, V 20bT) and go up the fluid pressure (P that exists with respect to the not homonymy (20a, 20b) of the piston of described hydraulic actuator (2) thus 20aT, P 20bT), change the volume fluid flow (V of the not homonymy that arrives described piston 20a, V 20b) between mutual ratio and change the fluid pressure (P that exists on the not homonymy of described piston thus 20a, P 20b).
7. method as claimed in claim 6 is characterized in that,
-be used for reducing the described volume fluid flow (V of the volume fluid flow of the piston of hydraulic cylinder (20) and the balanced attitude that in the specific period, exists on the active side with respect to the piston of the same described hydraulic actuator of equilibrium state (20) simultaneously for example on the pressure side that flows into described hydraulic actuator (2) according to the described load shedding pulse of adjusting instruction (F) 20ba) and with respect to the balanced attitude fluid pressure (P that establishes by described flow 20aT), with the fluid pressure that on the pressure side go up to exist of described hydraulic cylinder fluid pressure (P from described balanced attitude on the pressure side 20bT) and flow (V 20bT) be reduced to the fluid pressure (P of load shedding 20b1) and the flow (V that reduces 20bT), described hydraulic actuator (2) influences the described loading of support bar (3), and follows the flow (V that reduces with first side 20b1) and the fluid pressure (P of load shedding 20a1) reset to before the flow (V that exists of equilibrium state 20bT) and fluid pressure (P 20bT),
The described reset pulse of-described adjustment instruction is used for increasing and flows into the on the pressure side described of described hydraulic actuator (2), the volume fluid flow of the piston of for example described hydraulic cylinder (20) and the balanced attitude volume fluid flow (V that exists on the described active side of piston of same described hydraulic actuator (20) in respect to equilibrium state in the specific period simultaneously 20aT) and with respect to the balanced attitude fluid pressure (P that establishes by described flow 20aT), with the fluid pressure that on the pressure side go up to exist of described hydraulic cylinder stress level (P from the balanced attitude of described first side 20bT) and flow (V 20bT) be increased to the fluid pressure (P of increase 20b2) and the flow (V that increases 20b2), and then with the flow (V of described increase on the pressure side 20b2) and stress level (P 20b2) reset to the flow (V that equilibrium state exists 20bT) and stress level (P 20bT).
8. method as claimed in claim 7 is characterized in that:
-in order to generate the load shedding pulse, the aperture (1 of the optional network specific digit valve group (10) of process digital valve unit (100) according to adjusting instruction (F) A) the flow appropriate combination (1 of the digital valve (1) by in same described digital valve pack, selecting open mode at first 20b1), from equilibrium state, exist and by the combination (1 of the digital valve of opening in the equilibrium state (1) 20bT) initial flow established, be reduced to new, lower flow rate (V 20b1), the flow rate (V that reduces of the described flow of process and expectation 20b1) coupling, and after this, after the short time period of the beginning of load shedding pulse generative process, through the flow of the combination of the digital valve (1) of open mode in the described digital valve pack (10) by selecting the combination (1 with described initial equalization attitude 20bT) combination of digital valve of identical open mode, and reset to described initial equalization attitude flow,
-in order to generate the load reset pulse according to adjusting instruction, the balanced attitude valve combination (1 of the digital valve (1) of the described open mode of process digital valve pack (10) 20bT) balanced attitude flow (V) at first the suitable valve of the digital valve (1) by in same described digital valve pack (10), selecting open mode make up (1 20b2), and be increased to new, higher flow rate (V), the more high flow capacity speed (V of the described flow of process and the expectation of the 20b on the pressure side that enters described piston 20b2) coupling, and after this, after the short time period of the beginning of reset pulse generative process, through the described valve combination (1 of the digital valve (1) of open mode in the described digital valve pack (10) A) described flow by selecting the combination (1 with described initial equalization attitude 20bT) combination of digital valve of identical open mode, and reset to described balanced attitude flow, the combination (1 of described initial equalization attitude 20bT) can go up on the pressure side (20b) of described piston and establish previous described balanced attitude flow (V 20bT).
9. method as claimed in claim 8 is characterized in that, carries the nip pressure of load shedding pulse described roll nip (N) before to equal to carry reset pulse nip pressure afterwards.
10. as each described method among the claim 5-9, it is characterized in that, the described load shedding pulse and the described reset pulse of the nip pressure of described roll nip (N) generate in the device that comprises some continuous roll nip, that is, the described load shedding pulse of continuous roll nip and described reset pulse are by determining that according to the speed of described device the mode of phase place occurs in the continuous roll nip at special time.
11. method as claimed in claim 10 is characterized in that, the load shedding pulse of described continuous roll nip (N) and the timing of reset pulse both be subjected to joint (H; W s) arrive the time and the described joint (H of the described roll nip (N) of calender; W s) through the influence of time of described roll nip, also be subjected to the influence of the pressure loss of the hydraulic system of the configuration aspects of roll stacks in described calender (50) and use.
12., it is characterized in that described method comprises the steps: at least as each described method among the claim 1-4
-in the counter clockwise direction with respect to the web of material direct of travel of described roll nip (N), identification arrives the width of cloth material that exists in the web of material of described roll nip (N) and interrupts (H; W k) the position,
-estimate or calculate described width of cloth material to interrupt (H; W k) arrive time of the described roll nip (N) of calender, with and time by described roll nip (N),
-will adjust instruction (F) to be transferred at least one digital valve unit (100) of the nip pressure that is used to control described roll nip (N) from described control system (4), be used to handle described width of cloth material and interrupt the defective that the described roll nip (N) at calender causes,
-the latest when described width of cloth material interrupts arriving described roll nip,,, open described roll nip (N) according to adjusting instruction (F) by at least one digital valve unit (100) of getting involved.
13. method as claimed in claim 12, it is characterized in that, hydraulic actuator (2) by described intervention reduces to be applied to the load at least one or a plurality of roller of forming described roll nip (N), open described roll nip (N), make by at least one digital valve unit (100) of described intervention and according to the described aperture (1 that is transferred to described digital valve unit A) adjustment instruction (F), change on the pressure side (20b) and the flow (V of active side (20a) that arrive described hydraulic actuator (2) 20b, V 20a) between ratio and reduce to be applied to load on the described roller by acting on element (3) on the described roller.
14. method as claimed in claim 13 is characterized in that, described aperture (1 A) described adjustment instruction (F) comprising: the pressure load (P that reduces to be devoted to the described element (3) of the pressurization of the roller of existence in the described roll nip (N) between two rollers by step-wise manner k), so that when beginning to open described roll nip (N), the pressure load of the hydraulic actuator (2) on the described pressurizing member (3) is reduced to specified pressure load (P rapidly k) (step 1), and the described pressure load (P of the described hydraulic actuator (2) on described pressurizing member after this k) reduce with speed more slowly by step-wise manner (step 2), up to the expectation aperture that obtains described roll nip (N).
15. method as claimed in claim 14, it is characterized in that, the process that partially opens of described roll nip (N), in described adjustment instruction (F), control, digital valve unit (100) by described intervention realizes that with the feedforward adjustment modes process of partially opening utilizes guiding valve to realize with the feedback adjusting pattern.
16. method as claimed in claim 15, it is characterized in that, the initial acceleration stage of roll nip opening procedure, (the digital valve unit (100) of step 1) by described intervention realized, and the staged more slowly of described roll nip continues to open (step 2) and utilizes guiding valve to realize.
17., it is characterized in that (step 1) arrives on the pressure side (20b) of described hydraulic actuator (2) and the flow (V of active side (20a) at the described boost phase of described roll nip (N) opening procedure as each described method among the claim 13-16 20b, V 20a) ratio change by the aperture that changes first digital valve pack (10) at least one described digital valve unit (100), that is, forward direction enters the balanced attitude volume fluid flow (V of on the pressure side (20b) of described hydraulic actuator (2) in the equilibrium state before opening described roll nip by described digital valve pack 20bT) be reduced to new, lower flow (V 20b1), and can be by simultaneously via leading to fluid output line (7; 72) digital valve pack (10) removes fluid from the pressure side (20b) of described hydraulic actuator (2) and reduces, and described hydraulic actuator on the pressure side goes up the described fluid pressure that the exists fluid pressure (P from the initial equalization attitude thus 20bT) fall back to lower fluid pressure (P 20b1).
18. method as claimed in claim 17 is characterized in that, along with the described aperture (1 of described first digital valve pack (10) A) changing small size, forward direction enters the described flow (V of on the pressure side (20b) of described hydraulic actuator (2) like this 20b) from the fluid flow (V of described balanced attitude 20bT) be reduced to specific for low discharge (V 20b1), the described volume fluid flow (V that reduces 20b1) with from the fluid pressure (P of balanced attitude 20bT) the particular fluid pressure (P on the pressure side of the described hydraulic actuator (2) that falls after rise 20b1) coupling; Forward direction enter described hydraulic actuator (2) active side (20a) flow rate also from the fluid pressure (P of specific balanced attitude 20aT) flow (V of balanced attitude of coupling 20aT) by strengthening the described aperture (1 of second digital valve pack (10) A) and be increased to the flow (V of the specific increase of described active side (20a) synchronously 20a1), the fluid pressure (P of the specific increase of the volume fluid flow of described increase and the active side of described hydraulic actuator 20a1) coupling.
19. as claim 17 or 18 described methods, it is characterized in that, (Fig. 3 B, step 1), control enter the aperture (1 of the digital valve pack (10) at least one digital valve unit (100) of fluid stream of described on the pressure side (20b) of hydraulic actuator at the described boost phase of opening procedure 20b), from enter described specific balanced attitude volume fluid flow (V on the pressure side 20bT) coupling initial equalization attitude aperture (1 20bT), make up (1 by the new valve of the valve (1) of selection open mode in described digital valve pack (10) 20b1), and can by from the pressure side (20b) of described hydraulic actuator via leading to fluid output line (7; 72) digital valve pack (10) removes hydraulic fluid, and changes the change little aperture (1 of new of small size to the described digital valve pack (10) of same described digital valve unit (100) A), with the volume fluid flow (V that reduces of the expectation of on the pressure side (20b) that obtain to enter described hydraulic actuator 20b1).
20. method as claimed in claim 18 is characterized in that, forward direction enter described hydraulic actuator (2) active side (20a) flow speed from specific balanced attitude fluid pressure (P 20aT) and the digital valve pack (10) of described digital valve unit (100) in the particular valve combination (1 of the described valve (1) opened in equilibrium state 20aT) coupling balanced attitude flow (V 20aT) be increased to the flow (V of specific increase 20a1), the volume fluid flow (V of described increase 20a1) with the fluid pressure (P of the specific increase of the active side of described hydraulic actuator 20a1) coupling, in the described digital valve pack (10) of the described digital valve unit (100) of the described flow rate of control, select the new valve combination (1 of the valve (1) of described open mode by the described aperture of strengthening second digital valve pack (10) 20a1) obtain the flow (V of described increase 20a1).
21. as each described method among the claim 13-16, it is characterized in that the roll nip opening stage of described acceleration (the described staged after the step 1), continues to open described roll nip (N) (step 2) more slowly and realizes by at least one digital valve unit (100) of described intervention.
22. method as claimed in claim 21, it is characterized in that the staged of described roll nip (N) continues to open piston head side (20b) and the last fluid pressure (P that exists of piston rod side (20a) that reduces described hydraulic actuator (2) at least by two of described intervention discrete digital valve pack (10) by step-wise manner 20b, P 20a) between difference carry out.
23. method as claimed in claim 22 is characterized in that, continues to open the flow (V of on the pressure side (20b) that be fed to described hydraulic actuator (2) in (step 2) in the described staged of described roll nip (N) 20b), and therefore also go up the fluid pressure (P that exists at described on the pressure side (20b) 20b) increase by step-wise manner, and the back pressure (P20a) that exists on the active side (20a) of described piston can reduce by step-wise manner simultaneously a little, so that described hydraulic actuator (2) on the pressure side with active side on the fluid pressure that exists in equilibrium in the latter stage of described staged opening procedure, the active side of described piston (20a) has the new balanced attitude fluid pressure (P that wherein exists thus 20an '), and on the pressure side (20b) of described piston has the new balanced attitude fluid pressure (P that wherein exists 20bn), the described fluid pressure (P of these new equilibrium states 20an, P 20bn) all open than described roll nip before the described active side (20a) of described piston and described on the pressure side (20b) go up the described fluid pressure (P of equilibrium state of existence 20aT, P 20bT) low.
24. method as claimed in claim 23, it is characterized in that, be fed to the flow of (20b) on the pressure side of described hydraulic actuator (2),, utilize the aperture (1 of selecting described digital valve pack (10) by the digital valve pack (10) of the described intervention at least one digital valve unit (100) 20b2 ', 1 20b3 "... 1 20bn), increasing by step-wise manner, described digital valve pack (10) is established the volume fluid flow (V that increases continuously of described on the pressure side (20b) 20b2, V 20b3... V 20bn).
25., it is characterized in that the active side of described hydraulic actuator (20a) goes up the back pressure (P that exists as claim 23 or 24 described methods 20), by the digital valve pack (10) of the described intervention at least one digital valve unit (100), utilize the aperture (1 of selecting described digital valve pack 20a2 ', 1 20a3 ", 1 20an), reducing by step-wise manner, described digital valve pack is established the volume fluid flow (V that reduces continuously of described on the pressure side (20b) 20a2, V 20a3... V 20an).
26., it is characterized in that as each described method among the claim 1-4:
The defective (H) that exists on-the surface to the fiber web (W) that arrives glazing calender (500), for example shaggy position, discerned widdershins in that the described roll nip (N) that is in described fiber web direct of travel is preceding, and estimate or calculate time of advent of defective described in each roll nip of described glazing calender and described defective time by each roll nip (N)
-feedforward is adjusted instruction (F) and is transferred at least one digital valve unit (100) of the described nip pressure that is used to control each roll nip (N) from control system, is used for handling the described defect point (H) of the described roll nip (N) of described glazing calender (500),
-according to described adjustment instruction (F), when described defective arrives described roll nip, reduce the described nip pressure of described roll nip (N) the latest, and when described defective is left described roll nip, increase described nip pressure by at least one digital valve of described intervention.
27. method as claimed in claim 26 is characterized in that:
-described adjustment instruction comprises the load shedding pulse of the nip pressure of described roll nip (N), and the nip pressure (P) of the particular roll nip (N) of wherein said glazing calender (500) is applied to pressure load (P on the roller support bar (3) by reducing hydraulic cylinder (20) k) and reduce, and the load reset pulse, wherein said hydraulic cylinder (20) is applied to the described pressure load (P on the same described support bar (3) k) reset to initial value,
-nip pressure (N p) described load shedding pulse and described nip pressure (N p) described reset pulse generate by the aperture that changes the digital valve pack (10) in the digital valve unit (100), arrive the volume fluid flow (V of not homonymy (20a, 20b) of the piston (22) of hydraulic cylinder (20) like this from described digital valve pack (10) 20a, V 20b) mutual ratio and the ratio that also has the fluid pressure that the not homonymy (20a, 20b) of described hydraulic cylinder piston go up to exist thus with respect to the volume fluid flow (V that arrives the not homonymy of described piston in the equilibrium state 20aT, V 20bT) and the not homonymy of described piston on the fluid pressure (P that exists 20aT, P 20bT) and change.
28., it is characterized in that as each described method among the claim 1-4:
-identification is used for the defect point (H) that exists on the surface of the application roll of the coating machine of fiber web (W) or surface size press or its reverse rollers, the shaggy position on application roll or its reverse rollers for example,
-to estimate or calculate described defect point (H), the rough surface on application roll or its reverse rollers for example arrives time of the roll nip between described application roll and the reverse rollers thereof, and the time by described roll nip,
Instruction (F) is transferred to the described nip pressure that is used for control roll nip (N) from control system (4) at least one digital valve unit (100) is adjusted in-feedforward, is used for handling the defect point of the described roll nip (N) between described application roll and the reverse rollers thereof,
-according to described adjustment instruction (F), when described defect point arrives described roll nip, reduce the described nip pressure of roll nip (N) the latest, and when described defect point is left described roll nip (N), increase described nip pressure by at least one digital valve of described intervention.
29., it is characterized in that as each described method among the claim 1-4:
Defect point (H) in the paper web (W) of-recoil on storage spool, for example recoil the shaggy position of paper, described storage spool and for example the upstream of the roll nip (N) between the reverse rollers of backing roll and/or breast roll discerned widdershins along the paper web direct of travel, and estimate or calculate the time of the described roll nip (N) between described defect point (H) described storage spool of arrival and the reverse rollers thereof, and the time by described roll nip/a plurality of roll nip
Instruction (F) is transferred to the described nip pressure that is used to control described roll nip (N) from control system (4) at least one digital valve unit (100) is adjusted in-feedforward, be used for handling the described defect point (H) of the described roll nip (N) between described storage spool and backing roll and/or the breast roll
-according to described adjustment instruction (F), when described defect point (H) arrives described roll nip between described storage spool and backing roll and/or the breast roll, reduce the described nip pressure of roll nip the latest, and when described defect point is left described roll nip/a plurality of roll nip, increase described nip pressure by at least one digital valve unit (100) of described intervention.
30., it is characterized in that as claim 28 or 29 described methods:
-described adjustment instruction comprises the load shedding pulse of the described nip pressure of roll nip, the nip pressure (N of the roll nip between its central roll and the reverse rollers thereof p) reduce by the pressure load that reduces on the element (3) that hydraulic actuator (2) is applied to the described roller of supporting/pressurization and/or its reverse rollers, and load reset pulse, the described pressure load that wherein said hydraulic cylinder (2) is applied on this element (3) resets to initial value
-nip pressure (N p) described load shedding pulse and described reset pulse generate by the digital valve that comprises in the described digital valve pack (10) of using digital valve unit (100), be used for arriving the volume fluid flow (V of the not homonymy (20a, 20b) of the piston of hydraulic actuator (3) with respect to equilibrium state 20aT, V 20bTTherefore) and go up the fluid pressure (P that exists at the not homonymy (20a, 20b) of the piston of described hydraulic actuator 20aT, P 20bT), the relative ratios (V of the volume fluid flow of the not homonymy of the described piston of change arrival 20a, V 20b) and the fluid pressure (P that on the not homonymy of described piston, exists thus 20a, P 20b).
31., it is characterized in that described method comprises the steps: at least as each described method among the claim 1-4
-by with respect to the counterclockwise mode of endless belt, discern the endless belt (8a) that rotates into the described long nip press (N) in the boots formula calender (800) and go up the point (H thinner than the remainder of described band about the direction of rotation of long nip press (N); H t) position and described thinner point (H; Ht) scope, described long nip press (N) are established the boots formula element (8b) be boots formula roller (8) and are gone up between the reverse rollers (80) of the described endless belt (8a) of rotation and described boots formula roller,
Described point (the H of the described endless belt (8a) that-estimation or calculating are thinner than described endless belt remainder; Ht) arrive time of described long nip press (N), and the described point (H of the described endless belt (8a) thinner than described endless belt remainder; Ht) time of the described long nip press of process (N),
-feedforward is adjusted instruction (F) and is transferred at least one digital valve unit (100) of the nip pressure that is used to control described long nip press (N) from control system (4), is used for handling the described point (H of described long nip press (N) the described endless belt (8a) thinner than described endless belt remainder; H t),
-the latest at the described point (H of the described endless belt (8a) thinner than described endless belt remainder; H t) when arriving described long nip press, according to adjusting instruction, by at least one digital valve unit (100) of described intervention, reduce the nip pressure of described long nip press (N), and when this thickness reduces a little to leave described long nip press (N), increase described nip pressure.
32. method as claimed in claim 31 is characterized in that:
-described adjustment instruction comprises the load shedding pulse of the nip pressure (P1) of described long nip press (N), the described nip pressure (P1) of wherein said long nip press (N) reduces by the pressure load (P1) that reduces hydraulic cylinder (200) and be applied on the described boots formula element (8b), and nip pressure reset pulse, the described pressure load (P1) that wherein said hydraulic actuator (200) is applied on the same described boots formula element (8b) resets to initial value
-described nip pressure load shedding pulse and described nip pressure reset pulse generate by the aperture that changes the digital valve pack in the digital valve unit (100), like this, with respect to the volume fluid flow of the not homonymy of the piston that arrives described hydraulic cylinder (200) in the equilibrium state and the fluid pressure that therefore on the not homonymy of described piston, exists, and change the relative ratios of volume fluid flow of not homonymy of the piston that arrives described hydraulic cylinder (200) and the fluid pressure that on the not homonymy of the piston of described hydraulic actuator (200), exists thus.
33., it is characterized in that the point (H of the described endless belt (8a) thinner as claim 31 or 32 described methods than described endless belt remainder; H t) described position on the basis of measuring the surface pressing (P2) of endless belt described in the described long nip press (N), also in described long nip press (N), measure on the basis of pressure load (P1) of the described boots formula element of establishing by described hydraulic cylinder (200) (8b), and on the basis that the pressure of establishing between these pressure (P1, P2) falls, discerned.
34. as each described method among the claim 31-33, it is characterized in that, in the described load shedding pulse of described adjustment instruction (F), consider the rotating speed, described long nip press (N) of described endless belt (8a) length along machine direction, and the point (H that reduces thickness of described endless belt; H t) surface area and thickness reduce degree.
35., it is characterized in that as each described method among the claim 31-34:
-in the load shedding pulse of described adjustment instruction (F), the fluid pressure that exists on the volume fluid flow of first side of the described piston of the hydraulic cylinder (200) of the inflow described boots formula element of pressurization (8b) and described first side of described hydraulic cylinder (200), at fluid pressure and the flow fluid pressure that be reduced to reduction and the flow that reduce of special time period from the described balanced attitude of described first side, and described first side of the flow that reduces that on described first side of the piston of described hydraulic cylinder (200) after this, exists and the fluid pressure piston that is reset to described the hydraulic cylinder flow and the fluid pressure that exist in equilibrium state, thus, in described equilibrium state, the described fluid pressure that exists on described first side of described hydraulic cylinder (200) equals the described balanced attitude fluid pressure (back pressure) that exists on second side of described piston of described hydraulic cylinder (200)
The reset pulse of-described adjustment instruction, be used for and flow into the volume fluid flow of described first side of piston of described hydraulic cylinder (200) and the fluid pressure that exists on described first side of the piston of described hydraulic cylinder (200) simultaneously, stress level and flow from first side of the described hydraulic cylinder (200) of described balanced attitude, be increased to the fluid pressure of increase and the flow of increase, and after this flow and the fluid pressure of the described increase of described first side of the piston of described hydraulic cylinder (200) reset to flow and the fluid pressure that described equilibrium state exists, thus, in described equilibrium state, the fluid pressure that exists on first side of described hydraulic cylinder (200) equals the fluid pressure (back pressure) of the described balanced attitude on described second side of piston of described hydraulic cylinder (200).
36. method as claimed in claim 35 is characterized in that:
-in order to generate the load shedding pulse, the combination (1 of the digital valve (1) of the open mode of the optional network specific digit valve group (10) of process described digital valve unit (100) according to adjusting instruction (F) A) flow (V), the flow established of the particular combinations of the digital valve of from equilibrium state described digital valve pack (10) that exist and, opening (1) at first by described equilibrium state, by in same described digital valve pack (10), selecting the combination of the digital valve (1) of suitable open mode, and be reduced to new, low volume flow, the volume flow that reduces of the described flow matches expectation of process, and after this, after the short time period of the beginning of described load shedding pulse generative process, the combination of the digital valve (1) by selecting open mode identical in the described digital valve pack with the combination of described initial equalization attitude, to reset to the flow of described initial equalization attitude through the described flow (V) of the described combination of the digital valve (1) of the open mode of described digital valve pack (10)
-in order to generate load reset pulse, the particular combinations (1 of the digital valve (1) of the described open mode in the optional network specific digit valve group (10) of process described digital valve unit (100) according to adjusting instruction (F) A) flow (V), the initial flow established of the specific balanced state combination of the digital valve of from described equilibrium state described digital valve pack (10) that exist and, opening (1) at first by described equilibrium state, by selecting the appropriate combination of the digital valve (1) of open mode in the same described digital valve pack (10), be increased to new, bigger volume flow, the volume flow of the increase of the described flow matches expectation of process, and after this, after the short time period of the beginning of reset pulse generative process, by selecting the described combination of digital valve (1) of open mode identical in the described digital valve pack, will reset to described initial equalization attitude flow through the described flow (V) of the described combination of the digital valve (1) of the open mode of described digital valve pack (10) with described initial equalization state combination.
37. device, be used for realizing the described method of claim 1 at calender with at least one roll stacks, described device is installed on the calender body and comprises at least two rollers (5), leave roll nip (N) between described two rollers (5), make web of material press polish betwixt, it is characterized in that described device comprises:
-control system, (4), comprise the roller that is used for discerning described web of material or described calender, (5) defective on, the instrument of position (H), be used to estimate or calculate defective near the roll nip between two rollers, (N) instrument of the time of advent, be used for estimation or calculate defective in same described roll nip, (N) instrument of the time of staying, and be used for generating feedforward and adjust instruction, (F) instrument, described adjustment instruction can make the described roll nip that arrives calender, (N) described defective, (H) obtain handling
-Adjustment System, comprise at least one digital valve unit (100), described digital valve unit can be adjusted the nip pressure of roll nip (N) according to the adjustment instruction that receives from described control system by at least one hydraulic actuator (2) of getting involved by the feedforward adjustment modes, make the latest when described defective (H) arrives described roll nip, can reduce the described nip pressure of roll nip by at least one valve (1) of the intervention of described digital valve unit (100) according to described adjustment instruction (F), and when described defective is left described roll nip (N), can increase described nip pressure.
38. device as claimed in claim 37 is characterized in that, described hydraulic actuator (2) is hydraulic cylinder (20).
39. as claim 37 or 38 described devices, it is characterized in that, each hydraulic actuator (2), described control system (4) comprises a digital valve cell (100).
40., it is characterized in that the described digital valve that exists in the digital valve pack (10) of described digital valve unit (100) has two positions as each described device among the claim 37-39; Open and close.
41. device as claimed in claim 40, it is characterized in that, the digital valve that is included in the digital valve pack (10) is continuous with regard to their nominal flow rate, and wherein the flow of the valve of forward direction by having higher nominal flow rate ability is up to the twice of the described flow of the valve of forward direction by having low nominal flow rate ability.
42., it is characterized in that described device is glazing calender (500), the bottom roller (5 of wherein said roll stacks as each described device among the claim 37-41; 5b) and top roller (5; There are many every ends to have the intermediate calender rolls (5 of roller support bar (3) 5b); 5a), each described support bar (3) and hydraulic actuator (2) coupling, described support bar (3) can utilize the Adjustment System that comprises at least one digital valve unit (100) to change to the loading effect of the roll nip between two rollers (N).
43. device as claimed in claim 42, it is characterized in that, each hydraulic actuator (2), described Adjustment System has a digital valve cell (100), and described digital valve unit (100) comprises on the pressure side (20b) and four digital valve pack (10) of the last fluid pressure (P20a, P20b) that exists of active side (20a) that can be used in each hydraulic actuator of adjustment (2).
44. device as claimed in claim 43 is characterized in that, each intermediate calender rolls (5 of described roll stacks (50); 5a) carry support bar (3), the operation of described support bar (3) is controlled by hydraulic actuator (2), and the operation of each hydraulic actuator (2) is adjusted by its specific digital valve unit (100) is independent, these digital valve unit need not therebetween directly the hydraulic fluid flow and by control system (4) synchronous effect thus, thus each digital valve unit (100) have oneself from hydraulic fluid supply line (7; The inlet of pressurised hydraulic fluid 71) and the hydraulic fluid of oneself are to tank line (7; 72) outlet.
45. device as claimed in claim 44 is characterized in that, at each intermediate calender rolls (5; The adjustment of the hydraulic actuator (2) of every end existence 5a) and described support bar (3) of pressurizeing utilizes identical in structure digital valve unit (100 each other; 100 ', 100; 100 ") carry out, with specified time interval, described adjustment instruction (F) is transported to the control circuit of identical described valve cell from described control system.
46. device as claimed in claim 45, it is characterized in that, described adjustment instruction (F) is to be used to arrive hydraulic actuator (2) or the adjustment instruction F (V) of the flow (V) of discharging from hydraulic actuator (2), the adjustment instruction F (X) that perhaps is used for the position of piston of hydraulic actuator (2), and utilize the adjustment of feed-forward mode to take place and feedback not according to the control of the hydraulic actuator (2) of adjusting instruction.
47. as each described device among the claim 37-41, it is characterized in that, described calender is a boots formula calender (800), it comprises boots formula roller (8), described boots formula roller (8) is made up of the boots formula element (8b) that is furnished with rotatable endless belt (8a) thereon, boots formula element (8b) can utilize and head on many hydraulic cylinders (200) that static calender body (85) supports self and pressurize from the below with specified pressure (P1) thus, so that the described endless belt (8b) that rotates on the top of this element is with the bearing down on one reverse rollers (80) of described boots formula roller of the specified pressure (P2) in the long nip press (N), described long nip press (N) is between described reverse rollers (80) and described endless belt (8b), and the web of material (W) for the treatment of press polish is directed in the described long nip press (N), and the described pressure that described thus hydraulic cylinder (200) is established can be utilized described control system (4) provides at least one digital valve unit (100) of adjusting instruction (F) to adjust.
CN2008801213224A 2007-12-14 2008-12-12 Method for dealing with faults occurring during the manufacture of a material web Expired - Fee Related CN101903594B (en)

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FI20070984A FI120317B (en) 2007-12-14 2007-12-14 Method of treating deviations during manufacture of a material web and plant for carrying out the procedure in a calender
FI20070984 2007-12-14
PCT/FI2008/050734 WO2009077650A1 (en) 2007-12-14 2008-12-12 Method for dealing with faults occurring during the manufacture of a material web

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CN113515046A (en) * 2021-07-19 2021-10-19 西安理工大学 Winding tension control method of web coating machine based on feedforward control
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WO2009077650A1 (en) 2009-06-25
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FI20070984A0 (en) 2007-12-14
EP2231924B1 (en) 2011-06-01
ATE511574T1 (en) 2011-06-15
FI20070984A (en) 2009-06-15
CN101903594B (en) 2012-07-18

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