CN103206433B - A kind of hydraulic pressure group control energy-saving system - Google Patents
A kind of hydraulic pressure group control energy-saving system Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
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- 239000012530 fluid Substances 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000009825 accumulation Methods 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 7
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- 238000003825 pressing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 238000007726 management method Methods 0.000 description 2
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Abstract
A kind of hydraulic pressure group control energy-saving system, it includes central hydraulic station, each single devices, it is characterized in that: with the central hydraulic station of oil supply system, and be provided with the single devices of S1 ~ S6 push-button switch, the oil supply system at central hydraulic station connects the hydraulic oil inlet of single devices respectively by pipeline, and the return opening of single devices and leakage hydraulic fluid port are respectively by pipeline tieback central hydraulic station, and central hydraulic station adopts PLC to control, communication and Parameter transfer is had between the PLC at central hydraulic station and single devices, make the starting-up signal of each single devices, the cycle T that stopping signal and single devices produce product uploads in the PLC at central hydraulic station, by the push-button switch in each single devices, parameter list corresponding in the PLC program at central hydraulic station is activated, quantity opened by the pump controlling central hydraulic station according to actual production demand by the PLC at central hydraulic station, mate the demand of each single devices hydraulic energy, it has obviously energy-conservation, control stable effect.
Description
Technical field
The present invention relates to a kind of technical field of hydraulic pressure, is a kind of novel hydraulic power-saving technology, is applicable to the group control system of class as middle-size and small-size multiple stage single devices such as injection machine, lathe, harbor crane, industrial robots.
Background technique
Energy Saving Technology by Hydraulic Pressure is used widely on some units, widely used variable-frequency motor power-saving technology on such as injection machine, and these technology serve larger energy-conserving action really, but only considers from unit angle, and its energy saving space is close to the limit.If use hydraulic pressure group control energy-saving technology, make the demand volume of original each unit put together unified management, as long as each stand-alone device does not reach peak flow demand at synchronization, then this energy saving space will be obviously.
Former single devices, when using machine one hydraulic station, we have to from the maximum output peak flow of system and pressure maximum to design its maximum output, but when we use hydraulic pressure group control technology, we just need not consider the peak energy demand of single devices, because each single devices peak demand always staggers in time, unless thought the common output deliberately pursuing certain moment peak value.So, we only need consider the mean flowrate demand in certain workpiece machining cycle, even if the peak-peak traffic demand that may occur, also can be met well by the quick startup of Large Copacity accumulation of energy station and back work pump, significantly can lower the electric motor power of oil hydraulic pump like this, thus reduction system no-load power consumption reaches energy-conservation object.
In stand-alone device, hydraulic system peak rate of flow peak demand often differs several times with the mean flowrate demand in the process-cycle, visible, uses hydraulic pressure group control energy-saving technology to have the larger energy saving space.
Summary of the invention
Technical problem to be solved by this invention is convenient to hydraulic pressure group control energy-saving system that is energy-conservation and that control
The present invention solves the problems of the technologies described above adopted technological scheme: a kind of hydraulic pressure group control energy-saving system, and it includes central hydraulic station, each single devices, it is characterized in that:
There are the oil supply system externally providing hydraulic oil and the circulatory system playing filtration, cooling in central hydraulic station;
Single devices has respective hydraulic valve platform, hydraulic actuator and oil hydraulic circuit relatively independent separately; In each single devices, at least there are 4 push-button switches, wherein S1 is " startup " button of single devices, S2 is " stopping " button of single devices, S3 is " minimum operation cycle " button that single devices produces product, and S4 is " average duty cycle " button that single devices produces product;
The oil supply system at central hydraulic station connects the hydraulic oil inlet of single devices respectively by pipeline, and the return opening of single devices and leakage hydraulic fluid port are respectively by pipeline tieback central hydraulic station;
And central hydraulic station adopts PLC to control; communication and Parameter transfer is had between the PLC at central hydraulic station and single devices; the cycle T making the starting-up signal of each single devices, stopping signal and single devices produce product uploads in the PLC at central hydraulic station; by the push-button switch in each single devices, parameter list corresponding in the PLC program at central hydraulic station is activated; quantity opened by the pump controlling central hydraulic station according to actual production demand by the PLC at central hydraulic station, mates the demand of each single devices hydraulic energy.
As improvement, the oil supply system at described central hydraulic station is divided into high pressure oil system and low pressure oil system, accordingly, single devices is provided with high-pressure inlet and low pressure inlet, high pressure oil system delivery trunk road is made to be connected high-pressure inlet and the low pressure inlet of single devices respectively with low pressure oil system delivery trunk road, and the return opening of single devices and leak hydraulic fluid port respectively by total oil returning tube at central hydraulic station and total Leakage Energy oil returning tube tieback central hydraulic station.
Further improvement, described single devices also has " actual measurement operation cycle " push-button switch S5 that single devices produces product.
Improve, described single devices is also with one " Non-follow control " and " automatically controlling " selector switch S6, and when being located on " Non-follow control " position, the control of central hydraulic station working pump is transferred to manually to implement again; When selector switch is located on " automatically controlling " position, the control of central hydraulic station working pump transfers to PLC automatically to control.
Preferably, described central hydraulic station externally provides high-pressure oil feed or low pressure oil supply, both also can provide simultaneously, when both provide simultaneously, high pressure oil system and the relatively independent fuel feeding of low pressure oil system, hydraulic oil has relatively independent path of travel, and only under specific time or specific operating mode, high pressure oil system just can carry out oiling to the low pressure oil system short time.Such as, low service system is because of certain reason, and its system internal pressure sharply declines, drop to below normal operating pressure in short time, now, high-pressure system can be used in low service system to carry out urgent supplementary pressure, low pressure is when after pressure recover, and high-pressure system stops to oiling in low service system.
Further improvement, the oil supply system of inside, described central hydraulic station comprises high pressure oil system and low pressure oil system, they comprise working pump unit I, accumulation of energy station unit II, pressure sensing cell III and ECU (Electrical Control Unit) IV, described working pump unit I adopts main pump and service pump duty, working pump unit I provides flow needed for main flow and pressure and the system of maintenance internal and outernal leakage in order to give single devices and accumulation of energy station unit II, wherein main pump is normal operation, and service pump is adopt the signal of pressure sensing cell III detection to control it by ECU (Electrical Control Unit) IV to start or stop.
As improvement, described parameter list is:
The demand called after respectively of each single devices hydraulic oil: Δ V
1, Δ V
2, Δ V
3..., Δ V
n-1, Δ V
n, and regulation Δ V
always=Δ V
1+ Δ V
2+ Δ V
3+ ... + Δ V
n-1+ Δ V
n;
Q
allfor T average period
allcorresponding traffic demand, Q
greatlyfor certain product minimum average B configuration operation cycle T
littlecorresponding peak rate of flow demand, Q
realfor surveying the average duty cycle T of certain product
realcorresponding flow.Therefore every single devices has three significant flow parameter Q
all, Q
greatlyand Q
real, by each single devices called after respectively:
Q
equal 1, Q
equal 2, Q
equal 3..., Q
equal n-1, Q
equal n;
Q
large 1, Q
large 2, Q
large 3..., Q
large n-1, Q
large n;
Q
real 1, Q
real 2, Q
real 3..., Q
real n-1, Q
real n;
N is natural number.
Preferably, its main working pump total installed capacity flow Q of described central hydraulic station
mainmust can meet each Q of all single devices
greatlysum, back work pump total installed capacity flow Q
auxiliaryget main working pump 25 ~ 35%.
Preferably, effective discharge volume Δ V at described accumulation of energy station
storefor effective electric motor power V at accumulation of energy station
store10 ~ 25%.
Preferably, described oil supply system delivery pressure P must be greater than the lowest limit pressure P that each single devices can normally work
pole, accumulator initially fills nitrogen pressure and pressure switch P
1~ P
4following work relationship need be met:
P
1=1.1P
pole;
P
2＝1.1P
1；
P
3＝1.15P
2；
P
4＝1.15P
2；
P
store=P
pole.
Compared with prior art, the invention has the advantages that: use hydraulic pressure group control technology, we just need not consider the peak energy demand of single devices, because each single devices peak demand always staggers in time, unless thought the common output deliberately pursuing certain moment peak value, so, we only need consider the mean flowrate demand in certain workpiece machining cycle, even if the peak-peak traffic demand that may occur, also can be met well by the quick startup of Large Copacity accumulation of energy station and back work pump, significantly can lower the electric motor power of oil hydraulic pump like this, thus reduce system no-load power consumption, reach energy-conservation object, whole system controls stable, obviously energy-conservation, adopt the benefit of this central energy supply to mainly contain 3 points, the weight being the reduction of stand-alone device, saves expensive real estate, two electric motor powers (or quantity) being the reduction of motor-pump complete sets of equipment, have saved cost, three be convenient to implement energy-conservation, energy-saving effect is much better than the reducing energy consumption effect of stand-alone device.
Accompanying drawing explanation
Fig. 1 is hydraulic pressure group control system structure principle chart;
Fig. 2 is the internal structure schematic diagram at central hydraulic station.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
The team control hydraulic structure that the present invention provides formation one class single devices in examples of implementation becomes schematic diagram and constructive method.Present invention illustrates the relation between each structure and form the necessary condition of energy conserving system and the method for realization.
As shown in Figure 1, have n single devices (such as injection machine) in certain region, this n single devices shares a central hydraulic station, and hydraulic station cut-away view as shown in Figure 2.Its detailed content is see hereinafter describing.
In real work, the single devices that we run into may be comparatively complicated, some single devices only need high-pressure oil feed, some single devices only need low pressure oil supply, and some single devices demand high pressure and low pressure oil supply simultaneously, wherein need the system of fuel feeding while of high and low pressure comparatively common, the present invention is to need the system of high low pressure so that specific implementation process to be described simultaneously.
As shown in Figure 1, this figure is a hydraulic pressure group control system structural representation with n single devices, and this n single devices all needs high pressure and low pressure two kinds of forced feed loops, each single devices be labeled as respectively monomer 1, monomer 2 ..., monomer n-1, monomer n, wherein, the natural number of n >=2.This n single devices has respective hydraulic valve platform, hydraulic actuator and oil hydraulic circuit relatively independent separately, but they all need to be connected with central hydraulic station by hydraulic pipe line.In Fig. 1, inside, central hydraulic station has complete three relatively independent subtense angles, and they are high pressure oil system, the circulatory system and low pressure oil system respectively.High pressure oil system externally exports high pressure oil, low pressure oil system externally exports low pressure oil, the circulatory system is the circulation of the inner fluid in central hydraulic station, cooling, filtering function system, these three subtense angles are both separate, and another forms a complete central hydraulic station (see Fig. 2).P
highfor high pressure oil system delivery trunk road, central hydraulic station, P
lowfor low pressure oil system delivery trunk road, central hydraulic station, T is the total oil returning tube in central hydraulic station, and R is total Leakage Energy oil returning tube.The hydraulic valve platform of each single devices has 4 pipelines to be connected with central hydraulic station owner pipeline, and on each connecting pipeline, all arrange one safeguard valve, as shown in single devices in Fig. 11, these 4 valves are labeled as F1, F2, F3 and F4 respectively, single devices can be realized by respective valve to be connected with central hydraulic station or to isolate, be convenient to the maintenance of single devices.In each single devices, there are 5 push-button switches and a selector switch, wherein S1 is " startup " button of single devices, S2 is " stopping " button of single devices, S3 is " minimum operation cycle " button that single devices produces product, S4 is " average duty cycle " button that single devices produces product, S5 is " actual measurement operation cycle " button that single devices produces product, S6 is " Non-follow control " and " automatically controlling " selector switch, when being located on " Non-follow control " position, the control of central hydraulic station working pump is transferred to manually to implement; When selector switch is located on " automatically controlling " position, the control of central hydraulic station working pump transfers to the PLC at central hydraulic station automatically to control.
Central hydraulic station internal structure as shown in Figure 2.Central hydraulic station is the same with other energy-saving hydraulic station, is all a complete hydraulic station.The central hydraulic station that this figure provides, there are three complete subtense angles inside, they respectively: high pressure oil system, low pressure oil system and the circulatory system (comprising fuel tank).Three subtense angle both relatively independent operations, another forms a complete central hydraulic station, and wherein, high pressure oil system is structurally identical with low pressure oil system, just design parameter is different, and the present invention illustrates its internal structure and parameter designing for high pressure oil system.
As shown in Figure 2, high pressure oil system is by working pump unit I, and hydraulic energy-accumulating station unit II, pressure sensing cell III and ECU (Electrical Control Unit) IV form.Wherein, working pump unit I is subdivided into again main working pump unit A and miscellaneous function pump unit B by function.Hydraulic energy-accumulating station II is made up of some Large Copacity accumulators and appurtenances thereof.System pressure detection unit III is the element forming this energy-saving hydraulic station, and be made up of pressure contact switch or pressure transducer, usually, pressure switch must form by 4 ~ 5, or is made up of pressure transducer 1.System electric-controlled unit IV is the same with other hydraulic system, is made up of the electrical equipment software and hardware comprising PLC.
In this team control hydraulic system, each single devices can be a kind equipment, also may be multi-class device, that separately required pressure is identical or close to their common prescription, so that provide the hydraulic flow demand of one or more pressure ratings, if be not easy to meet, then need to use separately independently hydraulic station fuel feeding.In central hydraulic station, we also can only provide independent high pressure oil or low pressure oil, now only need a kind of system in both high and low pressures; But in the ordinary course of things, we need the hydraulic system of two or more pressure ratings, the present invention is illustrated for representative to provide the high and low pressure system of two kinds of pressure ratings.Generally, high pressure oil only moves in the pipeline that high-pressure system is closed, low pressure oil is only moved in the pipeline that low service system is closed, they have the path of travel of respective relative closure, only specific place and specific time, high pressure oil just allows to flow to low pressure oil system, such as, low pressure oil and high pressure oil can first oilings in certain oil cylinder backward chronologically, and for example oil returning tube can be shared, share fuel tank, for another example, when low service system occurs that pressure is extremely in emergency circumstances low, high pressure oil allows to short time oiling in low pressure oil pipeline, except this situation, should independent operating separately.
High and low pressure oil system is identical in structure with design method, and just design parameter is different, therefore the present invention only provides complete high pressure oil system design description.
This hydraulic pressure team control structural type refers in certain region, being often referred to radius is same class single devices within the scope of 1000 meters, such as injection machine, lathe, industrial robot, the single devices such as harbor crane, within the scope of this, the same large hydraulic station of common use provides hydraulic energy, hydraulic valve platform between central hydraulic station and each single devices is directly connected by pipeline, control valve was provided with before this pipeline enters each single devices hydraulic valve platform, this valve can be manual, electronic, surge or the control valve of other type, can open or cut off contacting between single devices and central hydraulic station by this valve, so that maintenance.
The present invention is for conventional monomer equipment one machine one hydraulic station, and something in common is that hydraulic actuator and hydraulic control circuit etc. are formed and substantially remains unchanged; Difference is the hydraulic station (comprising fuel tank, pump-motor and control system) eliminating former single devices, and then uses central large hydraulic station central energy supply form instead.Energy Saving Technology by Hydraulic Pressure is implemented easily in central hydraulic station.
Adopt the benefit of this central energy supply to mainly contain 3 points, the weight being the reduction of stand-alone device, saves expensive real estate; Two electric motor powers (or quantity) being the reduction of motor-pump complete sets of equipment, have saved cost; Three be convenient to implement energy-conservation, energy-saving effect is much better than the reducing energy consumption effect of stand-alone device.
Central hydraulic station adopts PLC to control, simple communication and Parameter transfer is had between the PLC at central hydraulic station and stand-alone device, the start of each single devices, the cycle T of stopping signal and production of units product all must upload in central PLC, the quantity (also can by manually implementing) that main working pump opens is controlled by central PLC, specifically by the S1 ~ S6 operating button in each single devices, parameter list corresponding in central PLC control program is activated, make central hydraulic station can according to the start quantity of each pump of actual production demand modeling, be convenient to export the demand of mating each unit hydraulic energy with optimum capacity.
The operation panel of each single devices has 6 control knobs (or switch), when pressing " startup " button S1 of single devices, stand-alone device enters " allow use " standby condition, this signal is passed in central PLC control program, PLC carries out main working pump and starts preparation, or reminds operator to carry out manually booting relevant working pump.When pressing " stopping " button S2 of single devices, single devices enters halted state, simultaneously, this instruction is transferred to central PLC, central control unit thinks that this single devices no longer needs flow to input, and central control unit can be cut off a certain (that working pump immediate with this single devices traffic demand) in main working pump automatically, make the main working pump be left can also meet those single devices, if can not meet, then main working pump does not stop; If when selecting switch S 6 to be placed in " Non-follow control " position, then the stopping of main working pump need by manually determining.When pressing the operation button any one button in S3 ~ S5, the operation cycle instruction that this single devices produces product is passed in central PLC control program, this single devices associated flow parameter (for details see attached table 1) table prestored in active control program.Wherein, S3 button signal activates the maximum mean flowrate demand of this product of " minimum operation cycle " correspondence; S4 button signal activates the mean flowrate demand of this unit work corresponding to " average duty cycle ", actual the actual production cycle that this single devices produces this product can be automatically tested during S5 pushbutton enable, and then draw actual flow demand, after being completed and again pressing S5, test parameter is delivered in central control unit automatically, stored in the parameter list in subordinate list one as calculated.These two buttons of S3, S4 can only select one of them at every turn, S5 button can be selected also can not select, S5 has preference relative to these two buttons of S3 and S4, S5 button can also can only enter into after actual product is produced and could select in single devices, this just has practical significance, when selecting this button, S3, S4 are just simultaneously ineffective, can reset after being completed, only otherwise again press S3 or S4 button, system is period from practical measurement with regard to being defaulted as the manufacture cycle of this product; And before use S5 button, generally first use S3 or S4 to estimate as to the cycle of this product.S6 is " Non-follow control " and " automatically controlling " selector switch, and when being located on " Non-follow control " position, the control of central hydraulic station working pump transfers to central hydraulic station manually to implement; When selector switch is located on " automatically controlling " position, the control of central hydraulic station working pump transfers to central PLC automatically to control.The order that these six switches use is; S1 → S6 → S3 (or S4 or S5) → S2, or S1 → S6 → S3 (or S4) → S5 → S2.It should be noted that, these six switches (or knob) also can be realized by the software of single devices, realize same function by the soft key in man-machine interface, in essence and indistinction.The control that we also can will unified for 6 buttons (or switch) of this in each stand-alone device operation panel depositing in central hydraulic station realize from top to bottom, but be generally placed in stand-alone device, use more more convenient.
In working pump unit I, each working pump is made up of one or more working pump-motor, wherein, main work pump motor section or all adopt frequency control motor, its working pump can adopt variable working pump, also can adopt paced work pump; And motor in back work pump unit B and pump are not strict with, and generally select threephase asynchronous machine and paced work pump just can meet energy-conservation actual demand, because always need external work done after back work pump startup.Hydraulic energy-accumulating station II is made up of some Large Copacity accumulators and appurtenances thereof.System pressure detection unit III is the element forming this energy-saving hydraulic station, and be made up of pressure contact switch or pressure transducer, usually, pressure switch must form by 4, or pressure transducer 1 composition.Called after pressure switch P respectively
1, P
2, P
3, P
4with pressure transducer PT, each pressure switch setting value meets: P
1< P
2< P
3< P
4, wherein P
1for system allows the Minimum operating pressure of output, P
4for the normal operating pressure of system.Pressure switch P
1control the automatic startup of back work pump, namely as pressure switch P
1when being triggered, back work pump unit B starts, automatically as pressure switch P
4when being triggered, back work pump unit B stops automatically.Pressure switch P
2, P
3and P
4the rotating speed of co-controlling variable-frequency motor, as pressure switch P
2when being triggered, motor operates with rated speed, as pressure switch P
3when being triggered, motor reduction runs, as pressure switch P
4when being triggered, variable-frequency motor operates with lowest speed, usually gets the speed low cruise of 1/5 ~ 1/3 of rated speed.ECU (Electrical Control Unit) IV is the same with each hydraulic station of existing use, ECU (Electrical Control Unit) is essential, the opening of its drive motor, to stop with the loading of pump, unloading function all by its soft and hardware to realize its controlling functions, the present invention selects PLC and frequency-variable controller to realize the controlling functions of pump (motor).
System major parameter optimum design (being determined by six job steps)
1), the determination of single devices pressure oil volume delta V;
2), single devices operation cycle and traffic demand are determined;
3), the determination of the total rated flow of working pump unit;
4), the determination of accumulator electric motor power;
5), the determination of system pressure parameter;
6), the determination of pump work system.
1, the determination of single devices pressure oil volume delta V
For completing certain task, each single devices work presents complete periodic duty feature, and in each operation cycle, hydraulic actuator course of action is all substantially constant, so in each operation cycle, the high pressure oil volume delta V required for each single devices remains unchanged substantially, for simplifying problem, we think that Δ V remains unchanged always, it is write in central PLC control program as a basic parameter, facilitates us to call at any time.The demand called after respectively of each single devices high pressure oil: Δ V
1, Δ V
2, Δ V
3..., Δ V
n-1, Δ V
n, and regulation Δ V
always=Δ V
1+ Δ V
2+ Δ V
3+ ... + Δ V
n-1+ Δ V
n.
2, single devices operation cycle and traffic demand are determined
In single devices periodically works, different because producing product variety, operation cycle of each product may difference very large, sometimes we need to be treated differently, and have 3 operation cycles to we are most important, they respectively: average duty cycle T
all, minimum average B configuration operation cycle T
little, actual measurement average duty cycle T
real.Average duty cycle T
allfor the actual average manufacture cycle in long-term production process, take all over products as research object, obtained by statistics actual count data; Minimum operation cycle T
littlefor producing the minimum average duty cycle of certain type product, this model is kind the fastest in all production products, and when producing this kind product, stand-alone device averaged hydraulic traffic demand is maximum; For increasing the flexibility that system uses, Operation system setting actual measurement operation cycle T
realmeasurement function, T
realfor the unknown real work cycle of actual measurement product, usually get the average period of production in certain period.These data can be collected easily and be obtained from actual production.
The cycle of each single devices is designated as respectively:
T
equal 1, T
equal 2, T
equal 3..., T
equal n-1, T
equal n;
T
little by 1, T
little by 2, T
little by 3..., T
little n-1, T
little n;
T
real 1, T
real 2, T
real 3..., T
real n-1, T
real n;
According to flow fundamental formular:
Q=Δ V/T, we obtain three groups of corresponding flow: Q
all, Q
greatly, Q
real; Wherein, Q
allfor T average period
allcorresponding traffic demand, Q
greatlyfor the peak rate of flow demand that certain product minimum average B configuration operation cycle is corresponding, Q
realfor the flow that the average duty cycle of surveying certain product is corresponding.Therefore every single devices has three significant flow parameter Q
all, Q
greatlyand Q
real, by each single devices called after respectively:
Q
equal 1, Q
equal 2, Q
equal 3..., Q
equal n-1, Q
equal n;
Q
large 1, Q
large 2, Q
large 3..., Q
large n-1, Q
large n;
Q
real 1, Q
real 2, Q
real 3..., Q
real n-1, Q
real n.
These three groups of flow parameters are the significant hydraulic flow demand of every single device, are that we carry out the key parameter of energy-saving design.
The each improve parameter unification of above-mentioned steps 1 and 2 is aggregated into parameter list and called after subordinate list 1, as follows:
Subordinate list 1
This parameter list is stored in the PLC control program of central hydraulic station, this parameter list is activated by the S1 ~ S5 button (or switch) in every platform single devices, after this parameter list is activated, system program carrys out the startup quantity of hydraulic control station owner working pump according to this parameter list, to guarantee that its flow can meet the demand of each single devices in the best way.
3, the determination of the total rated flow of working pump
Main working pump total installed capacity flow is defined as Q
main; Back work pump total installed capacity flow is defined as Q
auxiliary, first determine Q
main, next determines Q
auxiliary.
Main working pump total installed capacity flow Q
mainmust can meet each Q of all single devices
greatlysum, namely
Q
main>=Q
large 1+ Q
large 2+ Q
large 3+ ... + Q
large n-1+ Q
large n, get herein
Q
main=Q
large 1+ Q
large 2+ Q
large 3+ ... + Q
large n-1+ Q
large n;
Back work pump total installed capacity flow Q
auxiliaryget main working pump 30%, namely
Q
auxiliary=0.3Q
main.
4, the determination of accumulator electric motor power
Regulation Δ V
storefor effective discharge volume at accumulation of energy station, V
storefor effective electric motor power at accumulation of energy station, ξ is effective emission factor at accumulation of energy station.
Accumulation of energy station is the important component part of this energy-saving hydraulic station, for ensureing that equipment is reliable and increase energy-saving efficiency, select Large Copacity accumulation of energy station, effective emission factor ξ=10% ~ 25% at General Requirements accumulation of energy station, get about 15% to be convenient to realize, effective discharge volume Δ V at accumulation of energy station
storegeneral demand fulfillment Δ V
store>=10% Δ V
always.Advise preferred Δ V
store>=15% Δ V
alwaysfor good.
Determine accumulation of energy station effective discharge volume Δ V
store=15% Δ V
always, namely
Δ V
store=0.15 Δ V
always
Wherein, Δ V
storefor accumulation of energy station effective discharge volume at work, Δ V
alwaysfor the oil consumption total volume of each single devices within an operation cycle.
So the total installation of generating capacity at accumulation of energy station chooses V
store>=Δ V
alwaysfor good.
5, the determination of system pressure parameter
Definition: P is the actual delivery pressure of system, P
polefor the lowest limit pressure that each single devices can normally work, P
storefor accumulator initially fills nitrogen pressure, P
4for the design pressure of system worked well.
System delivery pressure P must be greater than the lowest limit pressure P that each single devices can normally work
pole, accumulator initially fills nitrogen pressure and pressure switch P
1~ P
4it is good for need meeting following work relationship:
P
1>=P
pole,generally get P
1=1.1P
pole,namely
P
1=1.1P
pole;
P
2＝1.1P
1；
P
3＝1.15P
2；
P
4＝1.15P
2。
P
store=P
pole
6, the determination of pump work system
The determination of pump work system is one of important content of this power-saving technology.In the control interface of central hydraulic station PLC; be provided with a pumping plant control interface; this picture is provided with a hydraulic station and " always starts " function button and " always a stopping " function button; after click " always startup " button also confirms; the each working pump power-supply system of pumping plant is activated, and allows each working pump to start, after click " always stops " button also to confirm; the each power-supply system of pumping plant is closed, system-down.After " always starting ", button is clicked, the startup of each working pump also must by manually or system program automatically start, when stand-alone device button S6 is located on " Non-follow control " position, stand-alone device comes into operation if will start, the main working pump at the central hydraulic station then corresponded must by manually starting, when stand-alone device button S6 is located on " automatically controlling " position, the main working pump of the central hydraulic corresponded is started automatically by PLC, and its activator button is S1 ~ S6; Its hold function is the same with start-up performance, has dividing of " automatically controlling " and " Non-follow control ".Only have when each single devices all quits work, and after each single devices S2 button is pressed, " the always stopping " button in the PLC of central hydraulic station just effectively.In a word, " always starting " and " the always stopping " button at central hydraulic station is in fact central hydraulic station power management button.
The each pump of back work pump is by pressure switch P
1control to start, by pressure switch P
4control to stop.
Other design parameter of system is determined not so difficult, and design parameters more provided by the invention are priority parameter, and system will select optimal parameter according to concrete actual conditions.
The design of other each several part of system is the same with conventional hydraulic system design, does not have specialization, here states with regard to no longer auspicious.
Effect inspection
Certain factory has model to be 450X injection machine 30, and every platform injection machine all carries a small-sized hydraulic station, and each hydraulic station be provided with height, in two grades of pressure sources.Such setting, concerning user, cost is very high, and the no-load power consumption of every platform injection machine is very high, energy waste is serious, although it is energy-conservation common electric machine can be replaced to carry out with actuating motor now, but actuating motor frequent starting, stopping, frequent acceleration and deceleration, its energy-saving effect general finite, and also actuating motor is expensive.
For these factory's the problems referred to above, these 30 hydraulic injection molding machine stations can be concentrated by we, adopt the energy conservation model being concentrated energy by central hydraulic station, realize unifying fuel feeding by central hydraulic station, remove original annotation molding machine little hydraulic station separately simultaneously.Central hydraulic station can provide high and medium voltage two kinds of pressure sources simultaneously, and in hydraulic station, arrange 2 cover Large Copacity hydraulic energy-accumulating stations, a set of is middle pressure accumulation of energy station, and a set of is high-pressure and hydraulic station, and often overlapping accumulation of energy station total installation of generating capacity is respectively 1500L.Like this, we just can use the drive motor power of approximately former 30 injection machine total installations of generating capacity 1/4, obtain same normal Production requirement.Why reduce total installation of generating capacity, one is because these 30 injection machines always form traffic demand of avoiding the peak hour, and two is carry out pressure store energy because employ jumbo hydraulic energy-accumulating station.In order to reach energy-conservation further, we are in central hydraulic station, and selected part motor is variable frequency regulating speed control, and when system pressure reaches normal setting pressure, motor reduction runs.
In these 30 injection machines, if because of production actual demand, only need to start equipment component, then the quantity of the most appropriate oil hydraulic pump in central hydraulic station is chosen in central hydraulic standing-meeting automatically automatically according to offered standby quantity, and system installed capacity so also can not be caused to be greater than the unfavorable situation of actual demand.
Through improved like this injection machine, hydraulic system is energy-conservation reaches more than 70%, uses actuating motor energy-conservation more than 15% than simple.Not only energy-conservation, also significantly lower in user cost, this is the direction of injection machine industry future development.
Claims (10)
1. a hydraulic pressure group control energy-saving system, it includes central hydraulic station, each single devices, it is characterized in that:
There are the oil supply system externally providing hydraulic oil and the circulatory system playing filtration, cooling in central hydraulic station;
Single devices has respective hydraulic valve platform, hydraulic actuator and oil hydraulic circuit relatively independent separately; In each single devices, at least there are 4 push-button switches, wherein S1 is " startup " button of single devices, S2 is " stopping " button of single devices, S3 is " minimum operation cycle " button that single devices produces product, and S4 is " average duty cycle " button that single devices produces product;
The oil supply system at central hydraulic station connects the hydraulic oil inlet of single devices respectively by pipeline, and the return opening of single devices and leakage hydraulic fluid port are respectively by pipeline tieback central hydraulic station;
And central hydraulic station adopts PLC to control; communication is had between the PLC at central hydraulic station and single devices; the cycle T making the starting-up signal of each single devices, stopping signal and single devices produce product uploads in the PLC at central hydraulic station; by the push-button switch in each single devices, parameter list corresponding in the PLC program at central hydraulic station is activated; quantity opened by the pump controlling central hydraulic station according to actual production demand by the PLC at central hydraulic station, mates the demand of each single devices hydraulic energy.
2. hydraulic pressure group control energy-saving system according to claim 1, it is characterized in that the oil supply system at described central hydraulic station is divided into high pressure oil system and low pressure oil system, accordingly, single devices is provided with high-pressure inlet and low pressure inlet, high pressure oil system delivery trunk road is made to be connected high-pressure inlet and the low pressure inlet of single devices respectively with low pressure oil system delivery trunk road, and the return opening of single devices and leak hydraulic fluid port respectively by total oil returning tube at central hydraulic station and total Leakage Energy oil returning tube tieback central hydraulic station.
3. hydraulic pressure group control energy-saving system according to claim 1, is characterized in that described single devices also has " actual measurement operation cycle " push-button switch S5 that single devices produces product.
4. hydraulic pressure group control energy-saving system according to claim 1, it is characterized in that described single devices also with one " Non-follow control " and " automatically controlling " selector switch S6, when being located on " Non-follow control " position, the control of central hydraulic station working pump is transferred to manually to implement; When selector switch is located on " automatically controlling " position, the control of central hydraulic station working pump transfers to PLC automatically to control.
5. hydraulic pressure group control energy-saving system according to claim 2, it is characterized in that described central hydraulic station externally provides high-pressure oil feed or low pressure oil supply, both also can provide simultaneously, when both provide simultaneously, high pressure oil system and the relatively independent fuel feeding of low pressure oil system, hydraulic oil has relatively independent path of travel, only under specific operating mode, high pressure oil system just can carry out oiling to the low pressure oil system short time, specific operation refers to that low service system is because of certain reason, its system internal pressure sharply declines, below normal operating pressure is dropped in short time, now, high pressure oil system can be used in low pressure oil system to carry out urgent supplementary pressure, when after pressure recover, high pressure oil system stops to oiling in low pressure oil system.
6. hydraulic pressure group control energy-saving system according to claim 1, it is characterized in that the oil supply system of inside, described central hydraulic station comprises high pressure oil system and low pressure oil system, they comprise working pump unit (I), accumulation of energy station unit (II), pressure sensing cell (III) and ECU (Electrical Control Unit) (IV), described working pump unit (I) adopts main pump and service pump duty, working pump unit (I) provides flow needed for main flow and pressure and the system of maintenance internal and outernal leakage in order to give single devices and accumulation of energy station unit (II), wherein main pump is normal operation, service pump starts or stops for adopting pressure sensing cell (III) signal that detects to control it by ECU (Electrical Control Unit) (IV).
7. hydraulic pressure group control energy-saving system according to claim 1, is characterized in that described parameter list comprises:
The volume needs called after respectively of each single devices hydraulic oil: △ V
1, △ V
2, △ V
3..., △ V
n-1, △ V
n, and regulation △ V
always=△ V
1+ △ V
2+ △ V
3+ ... + △ V
n-1+ △ V
n;
Q
allfor T average period
allcorresponding traffic demand, Q
all=△ V
always/ T
all; Q
greatlyfor certain product minimum average B configuration operation cycle T
littlecorresponding peak rate of flow demand, Q
greatly=△ V
always/ T
little; Q
realfor surveying the average duty cycle T of certain product
realactual flow, Q
real=△ V
always/ T
real; Every single devices has three significant flow parameter Q
all, Q
greatlyand Q
real, by each single devices called after respectively
:
Q
equal 1, Q
equal 2, Q
equal 3..., Q
equal n-1, Q
equal n;
Q
large 1, Q
large 2, Q
large 3..., Q
large n-1, Q
large n;
Q
real 1, Q
real 2, Q
real 3..., Q
real n-1, Q
real n;
N is natural number.
8. hydraulic pressure group control energy-saving system according to claim 1, is characterized in that described central hydraulic station its main pump total installed capacity flow Q
mainmust can meet each Q of all single devices
greatlysum, service pump total installed capacity flow Q
auxiliaryget main working pump flow 25 ~ 35%.
9. hydraulic pressure group control energy-saving system according to claim 6, is characterized in that effective discharge volume △ V of described accumulation of energy station unit (II)
storefor effective electric motor power V at accumulation of energy station unit (II)
store10 ~ 25%.
10. hydraulic pressure group control energy-saving system according to claim 1, is characterized in that the lowest limit pressure P that described oil supply system delivery pressure P must be greater than each single devices and can normally work
pole, accumulator initially fills nitrogen pressure and pressure switch pressure P
1~ P
4following work relationship need be met:
P
1=1.1P
pole;
P
2＝1.1P
1；
P
3＝1.15P
2；
P
4＝1.15P
2；
P
store=P
pole.
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| CN201210097372.1A CN103206433B (en) | 2012-01-17 | 2012-04-05 | A kind of hydraulic pressure group control energy-saving system |
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| CN201210097372.1A CN103206433B (en) | 2012-01-17 | 2012-04-05 | A kind of hydraulic pressure group control energy-saving system |
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| CN103713610A (en) * | 2014-01-02 | 2014-04-09 | 莱芜钢铁集团有限公司 | Hydraulic control system of hot rolling production line and control method thereof |
| CN105041731B (en) * | 2015-08-07 | 2017-03-08 | 中国中元国际工程有限公司 | Steelshop converter Hydraulic Station and its method for arranging |
| CN110153360A (en) * | 2018-01-26 | 2019-08-23 | 山东金马工业集团股份有限公司 | A kind of hot extrusion system of processing suitable for spindle nose forging |
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Inventor after: He Rongzhi Inventor after: Shen Feng Inventor after: Guo Shasha Inventor before: He Rongzhi |
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Address after: West Street in the official Zhejiang city of Ningbo province Zhenhai District 315201 Village No. 777 Patentee after: Ningbo harmonious energy saving Polytron Technologies Inc. Address before: West Street in the official Zhejiang city of Ningbo province Zhenhai District 315201 Village No. 777 Patentee before: NINGBO HEXIE ENERGY CONSERVATION CO.,LTD. |
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Effective date of registration: 20191218 Address after: No. 801, Beihai Road, Ningbo Chemical Industry Zone, Shupu Town, Zhenhai District, Ningbo City, Zhejiang Province Patentee after: NINGBO HESHENGDA ENERGY TECHNOLOGY CO.,LTD. Address before: West Street in the official Zhejiang city of Ningbo province Zhenhai District 315201 Village No. 777 Patentee before: Ningbo harmonious energy saving Polytron Technologies Inc. |