JPS6158706A - Method of regulating temperature of roller and roller devicewith roller-temperature regulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a heated strip of material (
The present invention relates to a roller temperature control method for forming a specific temperature distribution and turns each consisting of a high temperature region on a roller for compressing and heat-treating a belt-shaped material, and a roller device equipped with a roller temperature control device corresponding to this method.

[Conventional technology]

BACKGROUND OF THE INVENTION Rollers of the prior art, which are heated with a liquid heat transfer medium guided through them, in which all parts of the roller are connected to one another and rotate together, have already been known for a long time. In the case of this roller, longitudinal grooves or grooves extending helically around the turn of the roller shaft are formed, which are connected to one another in a serpentine manner in a suitable manner, at a distance as small as possible, so that l =-shi, the heat transfer liquid is pumped through this groove.

In this case, if the purpose is to generate high temperatures,
At the same time, higher temperatures have been considered for heat transfer media. Polyglycols, silicone oils, and other synthetic fluids for use as heat transfer fluids are commercially available and can withstand temperatures up to about 300° C. in continuous operation. Therefore, taking into account heat losses, a certain limit temperature of the roller surface is provided, which generally lies in the range of 230 DEG to 250 DEG C. Such high temperatures on the roller surface can be used, for example, in the case of compression treatment of fiber sets made of 49% polyester and other synthetic resins, in the processing of glass films, and in the bonding of this glazed film with other strip materials. The need arises in the case of textile polishing for the compression treatment of canvas materials, anorak materials, etc., and also in the polishing of paper, etc.

Conventional rollers therefore have limitations in their use when processing wide strips and high requirements for pressure action and heat transfer uniformity. be. That is, rollers of this type flex under counterpressure from the strip, so that uniformity of processing cannot be achieved without special measures.

In order to solve this problem, rollers of moderate construction with internal hydraulic support have been known for several decades, which have a shell formed as a rotating hollow roller and which A fixing glue, a loss beam, a core or a support member passes through the inner circumferential surface of the hollow roller, which is kept at a distance from the inner circumferential surface of the hollow roller. A hydraulic device is provided between this inner peripheral surface and the cross beam, which acts on the inner peripheral surface and transmits the force to the cross beam, which receives this force. Although it is possible to flex within the hollow roller, the hollow roller is not affected by this flexure.

One of the basic features of a hydraulic device is that it consists of a chamber filled with hydraulic fluid that is closed by a sealing member between a cross beam and the inner peripheral surface of a hollow roller. In the chamber, a hydraulic liquid acts directly on the inner circumferential surface of the hollow roller (DE 1026609 and DE1441327). In another construction K, the cross beam is formed with several cylindrical chambers distributed over its entire length, in which piston-shaped support elements are arranged υ, these support elements being The hollow rollers are in contact with each other on a suitably formed liquid sliding film through their nine sliding surfaces, which are the inner circumferential surfaces of the hollow rollers (German Patent Publication No. 1193792, German Federal Patent Publication No. 2230139, German Federal Patent Publication No. 1461006). . Ad constructions combining the above-mentioned basic channels are also known, for example according to DE 23 32 861, in which a longitudinal mold filled with a pressurized liquid is installed, e.g. DE 1 411 327. Several additional support members are arranged to generate additional pressure according to the number.

Furthermore, according to German Federal Patent Publication No. 3003359, from a series of pressure chambers,
The pressure is taken off locally through corresponding partitioning elements according to No. 411,327.

In all these examples, the hydraulic fluid used to generate its essentially linear pressure is given an additional function as a heat transfer medium, and also in the case of these rollers, the working roller The increase in temperature of the outer circumferential surface is achieved by means of heated liquid, ie hydraulic liquid, circulating within the roller. However, in this case, for all the above-mentioned types of rollers that are supported internally by hydraulic pressure, there are limitations, since the liquid must not only perform pure heat transfer, but also lubricate the seals and pressure pistons. . To date, there are no liquids that can be used at temperatures that would still lubricate conventional rollers using pure heat transfer liquids. Even in continuous operation, a liquid with sufficient lubrication ability can only withstand temperatures up to about 240°C, and the maximum temperature that can be reached on the work roller surface is about 180° to 200°C.
C is given, which is too low for many purposes.

Another disadvantage of conventionally used hydraulically supported rollers is that the liquid is distributed over the entire gap between the cross beam and the inner circumferential surface of the hollow roller, thereby increasing the This is based on the idea that the heat transfer is uniform. The temperature distribution over the entire width of the strip cannot be adjusted by the arm turn.

For example, an attempt that became known as German Federal Patent Publication No. 2902956 was published in German Federal Patent Publication No. 2
230139, in which a pressure liquid heated to different temperatures is supplied to support members distributed over the entire length of the roller, on the one hand; , and on the other hand by an additional spraying device distributed over the entire length of the roller sprays oil, possibly heated to different temperatures, onto the inner circumferential surface of the hollow roller; however, in this example, the outer circumferential surface of the hollow roller The influence that can be exerted on the temperature of the device is negligible and, moreover, control of the resulting temperature distribution is practically impossible due to the large thermal inertia of the device.

[Problems to be Solved by the Invention, Means for Solving the Problems, Actions/Effects] The object of the present invention is to provide a controllable temperature in a high-temperature area on the outer peripheral surface of the roller device by one working μm. It is an object of the present invention to provide a roller temperature adjusting method and a roller device equipped with a roller temperature adjusting device configured to obtain a distribution of nine turns.

To achieve the above objective, a roller temperature adjustment method is used to maintain a desired temperature on the working surface of a roller for compression heat treatment of a heated strip by internally hydraulically supported and circulating a liquid medium for pressure and heat transfer. In the method of forming a distributed armpit, the roller device is configured by adding the roller to be controllable from the outside and heating it by electromagnetic conduction, and the roller device is equipped with a roller temperature adjustment device.
A roller that is hydraulically supported internally and heated by circulating a liquid medium for pressure and heat transfer therein, and a roller temperature adjustment device that forms a desired temperature distribution or pattern on the working surface of the roller. In the apparatus, the roller temperature regulating device comprises a generator and a conductor loop connected to the generator and placed close to the working surface of the roller.

Due to electromagnetic induction heating, heat is generated within the working roller surface itself, and this heat does not have to flow through the entire thickness of the hollow roller. The amount of heat generated can be easily controlled by the amount of electrical power delivered. This therefore also applies to the temperature and temperature distribution pattern on the roller surface. However, the essential idea of the invention is that, rather than supplying the total amount of heat by inductive means, the basic heating of the roller surface to a temperature in the range of 170° C. is carried out in a conventional manner by means of a flow-through of a heat transfer medium. In other words, this heat transfer medium can be matched with a hydraulic medium. Up to this temperature range, no problems arise with the lubricating ability of the hydraulic medium. The additional inductive heating according to the invention only results in temperature peaks and thus in addition to the required temperature and in particular a localized temperature increase above the surface temperature obtained with conventional methods. . In this way, one only has to consider the variation above the base temperature which is regulated by conventional heating as well as inductive heating.

Unlike conventional heating methods, in the case of the present invention the highest temperature is at the roller surface and an inward temperature gradient occurs; can be directly controlled to prevent it from rising to a harmful range.

The roller surface electromagnetic induction heating itself is based on Beolt Corporation's Beolt Ecamp (TM) system.
Direct automatic control of Di degree distribution pattern (Direct a
automaticControl of CD moi
It is known from sture profH 儂)j. What we are dealing with here is influencing the humidity distribution/gut pattern of the drying cylinder and controlling the /4' space of the calender roller. There is no problem here in combining conventional heating with electromagnetic induction heating in order to obtain particularly high temperature changes.

It is recommended that the conductor loop is arranged immediately before the gap between the roller and its counterroller.

In this way, the heat that is generated very quickly and electromagnetically inductively on the roller surface is transferred to the strip without losses in the roller nip.

One of the important features of the invention is that the temperature can be influenced locally in different ways by electromagnetic induction means.

A corresponding device is known from DE 33 40 683 A1. Mounted on a support extending parallel to the roller axis are a number of electromagnetic coils having pole pieces extending close to the roller surface. The number of magnetizing currents can be controlled separately by variable ratio transformers, variable ratio converters and/or frequency converters, so that the temperature can be adjusted locally.

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A similar device is known from the brochure rdness Profile), J, in which the individual pole pieces with coils are closely spaced over the entire length of the roller and are moved together by a hydraulic cylinder. It can be pulled away from the roller surface at any time.

This device is used to adjust a predetermined nox with respect to the temperature or temperature distribution.

These known side structures have in common that the technical effort required to supply coil currents that are different and individually controllable is enormous. There must be a number of variable ratio transformers and converters corresponding to the number of coils. Although it is possible to heat to different temperatures locally, the cost of the equipment is generally much higher than traditional once-through heating, which can produce different temperatures in different regions. .

It is therefore another object of the invention to enable control of the temperature distribution notarium at a reduced cost in conjunction with electromagnetic induction heating.

The purpose is to create a desired temperature distribution pattern between the roller device with the roller temperature adjustment device, the roller that is hydraulically supported internally and heated by circulating a liquid medium for pressure and heat transfer inside, and the working surface of the roller. and a roller temperature adjustment device forming a roller, the roller temperature adjustment device being adjacent to the working surface of the roller and parallel to the axis of the roller, at least a portion of the roller. a conductor loop having two extending legs; and a conductor loop provided on the legs for adjusting the electromagnetic flux of the legs and concentrating the electromagnetic flux acting on the roller in a desired area. This is achieved by configuring it with a short concentrator.

The "conductor loop" has one essentially multiple windings and one
Rather than having a coil that is concentrated at a point, it has only one turn, and this one turn has an approximately hairpin shape that runs along the roller parallel to its surface. The free ends of both sides (legs) are connected to a power source.

A "concentrator" is provided on the leg. This "concentrator" is a magnetic pole piece-shaped thing made of ferromagnetic material, and is made of thin plates laminated insulated from each other to prevent eddy current loss inside the magnetic pole piece, such as in the core of a transformer. It is configured. The energy transfer to each longitudinal unit of the roller along the conductor loop assumes a predetermined constant value, but in the region of the concentrator O the magnetic flux is significantly concentrated, so that within the area of influence of the concentrator the energy transfer and its The associated heat generation within the roller increases.

In this way, uniform heating over the entire length of the roller as well as distributed no-turns in the form of localized heating are provided at little expense, which is often required, especially at the ends of the roller. This is because there are high heat losses due to radiation and heat transfer to the roller head, and the temperature drops in the case of uniform heating. of course,
It is also possible to correct the temperature distribution at any other position.

The essential point here is the reduction of technical complexity. All that is required is a power supply to the conductor loop, and a new value non-uniformity is created by the purely mechanical attachment of the gold pieces, which can be achieved in the most conventional manner, and which In this case, a temperature distribution A'-turn is given that completely satisfies the requirements.

The above kind of power concentration of electromagnetic roller heating means that it can also be used independently of conventional heating, rather than in combination with conventional heating, which heats the roller from the inside with liquid. Attached to L/.

The concentrator can be displaceable in the axial and/or radial direction of the roller in order to adapt it to the respective requirements regarding the position and strength of its action.

In the R'[L, roller arrangement] embodiment, the concentrator is movable in the longitudinal direction of the legs.

In this case, the shape of the concentrator is adapted to the cross section of the conductor loop, so that the concentrator is supported on this conductor loop and can be displaced in its longitudinal direction.

It is also encompassed by the present invention to manually set the concentrator to a desired position.

However, it is also possible to automate this process and to use adjustment devices to adjust the concentrators to the position or spacing on the conductor loop as deemed necessary by measurements of the web material, e.g. temperature or thickness values of the web. It is also possible to displace the roller both in the longitudinal direction and in the radial direction. It is not absolutely necessary to take measurements on the strip. It is also possible to control a predefined temperature distribution pattern on the roller itself.

One such embodiment that allows fine control of the effect of the concentrator on the roller without moving the concentrator in the radial direction of the roller is to install a saturation coil in the concentrator.

A saturating coil of this type is mounted on the rear side of the pole piece forming the concentrator, opposite the rollers, and provides a controllable degree of pre-saturation, which saturates the concentrator's concentrating and energy transfer effects. is weakened. Of course, in order to operate the saturated coil, in addition to the main power supply of the conductor loop, dedicated power supply means for operating the saturated coil are required, but as in the case of the prior art each individual Much less power is required for the saturated coil than if the inductors had to be powered independently of each other.

〔Example〕

Several embodiments of the invention are schematically shown in the drawings. In FIG. The lower roller 2 is held hydraulically on the inside and heated by a hydraulic medium. A material to be rolled 4 (FIG. 2) passes between rollers 1 and 2.

The pressure and heating device for generating the hydraulic medium and heat transfer medium for the lower roller 2 is designated by the reference numeral 5 in FIG. If these media are the same, i.e. if the hydraulic fluid is brought to the temperature it constitutes in the device 5 and is also used for the heating of the lower roller 2 at the same time, this medium is
It is guided from the cross beam 7 via a conduit 8 to a connection 6 provided on a fixed cross beam 7 as shown by the arrow, and from the cross beam 7 it is returned via a conduit 9 into the device 5 as shown by the arrow B. If the hydraulic pressure liquid and the heat transfer liquid are different, the first
Separate conduit B/ for the heat transfer liquid as shown in dotted line in the figure.
, g/ are provided.

By means of the device 5, the lower roller 2 is preheated to a predetermined temperature. A generator (Genera) is used for this preheating.
tor ) 20 is superimposed. This noenerator (medium frequency generator) 20 is
In this exemplary embodiment, there are three outputs that can be controlled separately depending on the output, each of which has a conductor loop 11.
, I 2 , 13, and these conductor loops 76zx, x2゜13 are arranged above the surface of the lower roller 2 and immediately before entering the roller gap 3. roller 2
rotates in the direction of arrow 14, the device rotates in the direction of arrow 14.
The device is substantially identical to the one shown in the figure, and in FIG. 2 the supply pipe 15 and return pipe 16 for the hydraulic liquid or heat transfer medium are shown diagrammatically. Conductor roof ″11, 12, 13
The number of 0's and the arrangement are determined according to each necessary condition. Generator 20 operates in the intermediate frequency range, approximately 2.7 kHz in the actual embodiment. In this case, the so-called penetration depth is approximately 1 min for steel. In this range of penetration depths, approximately 86 inches of the induced power is converted to heat. A Δt of 50° is immediately obtained on the roller surface and inner peripheral surface, but the limit temperature is 200°C.

Instead of a plurality of conductor loops 11, 12, 13, a concentrator (concentrator) provided on one conductor loop as shown in FIGS. 3 to 6 is used in order to generate a specific temperature distribution pattern consisting of: It is also possible to do so. Naturally, a concentrator could also be provided on any one of the conductor loops 11, 12, 13 to concentrate additional power.

A roller, generally designated 110 in FIG. 3, cooperates with a counter roller 120 (FIG. 4) and provides a roller gap 101 therebetween. Although the roller 110 is coated with halatin on the entire cross section in FIG. 4, it does not need to be solid at all.
0 is a hollow shell 10 that rotates around a fixed core 102
3 may be 'Iy-z. In this case, the hollow shell 103
is configured as a deflection-controllable roller which is supported from the inside on the core 102 via a hydraulic medium. Roller 1.
The work surface of 10 is generally made of steel, which is an electrically conductive material. However, this does not mean that this working surface cannot be provided with a layer of other materials. However, only within the surface area must a layer of electrically conductive material be provided. This is because otherwise electromagnetic conduction heat would not occur.

The electromagnetic induction heating of the roller 110 takes place by means of a conductor loop 104, which in this embodiment is used as an inductor and is formed from a single coil. The conductor loop f104 has 9 hairpin-shaped bends, and in this embodiment extends over the entire length of the roller 110. However, it may also be provided so that it occupies only a portion of the length of the roller 110, for example only half. The legs 104', 104'' of the conductor loop 104 extend parallel to the roller axis and in close proximity to it outside the surface, with an aperture between the legs 10° to 45° as seen from the center of the roller 110. , is approximately 30° in this embodiment.In FIG. 3, a hairpin-shaped conductor loose 10
Each terminal from the lower free end 105 of 4 to a current supply device (not shown) extends perpendicularly from the plane of the figure.

The conductor loop 104 consists of a hollow rectangular section made of copper, through which cooling water flows, as seen in FIG.

When alternating current is applied to the conductor loop f104, an electromagnetic field is formed, which penetrates into the surface of the roller 110, where it creates eddy currents that heat the roller surface by Joule heat.

The higher the frequency, the less depth of penetration into the surface of roller 110. If no additional measures are taken, conductor loop 104 provides approximately uniform heating across the entire length of roller 110 in the embodiment shown.

In order to generate more heat locally in the roller IIo at discrete points along its length, a concentrator 106, 107 configured in the form of a pole piece is provided on one leg of the hairpin-shaped conductor loop 104. It is provided. These concentrators 1θ6 and 107 are provided near the end of the roller 110 in this embodiment. This is because the heat dissipation there by radiation and heat transfer to the roller neck is more intense than at the inside of the roller, and if heat is supplied uniformly over the entire length, a temperature drop will appear at both ends. Therefore, the end drop in temperature is caused by the concentrator 1 in the position shown in FIG.
06,107. However, it is not always necessary to install a concentrator at the end. If desired, the concentrator can be mounted at other locations within the length of the roller, as shown in dotted lines in FIG.

Similarly, as shown by arrows 106' and 107' in FIG.
can be displaced in the longitudinal direction manually or by means of a suitable adjustment device 133. As shown by arrow 11 in FIG. 4, it can be displaced radially together with conductor loop 104 or relative to conductor loop 104VC.

The regulating device 133 is shown schematically in FIG. A measurement sensor is placed in contact with the strip 130 that has been processed by the roller 110. 131 is arranged, and the signal of this measuring sensor 131 is processed by a control device 132 and supplied to a regulating device 133. This adjusting device 133 is connected via a suitable actuating device 134 to each concentrator (for example 106) and displaces this concentrator axially and/or radially depending on the characteristic profile measured on the strip 130. .

The construction of the concentrator is clear from the example of concentrator 107 shown in FIGS. 5 and 6. That is, the concentrator 107 is composed of a U-shaped yoke, and its legs 1011 are directed toward the surface of the roller 110, and their inner end surfaces have a complementary shape to the surface of the roller 110, so that the legs 1011 are oriented toward the surface of the roller 110, and their inner end surfaces are shaped to be complementary to the surface of the roller 110. It has reached this point.

The internal space of the U-shaped yoke is the leg part 1 of the conductor loose 104.
04' has a shape that exactly matches the rectangular cross-sectional shape of the concentrator 10.
7 and can be easily mounted on and removed from the legs 104' or slid longitudinally on the legs 104.

The concentrator 1 o6.1 o z is configured according to the structure of the R pressure vessel iron core. That is, roller 110
(individual dynamo play arranged in the radial plane of)7
These dynamo plates 1o9 are made into one unit with an insulating face layer sandwiched between them. This insulating layer 112 allows the concentrator 1
06.107 itself is not heated.

As is clear from Figures 3 and 5, the concentrator/
In 102, a saturation coil 114 formed as a pot core coil (Topfspule) is attached to the back surface opposite to the roller 110, that is, the outer surface of the bulge part 113 connecting the legs 1θ8. A direct current can be passed to this via the fourth tank 115.

Accordingly, the concentrator 107 is partially or completely saturated, thereby partially or completely eliminating its ability to act as a pole piece. In this way, the strength of action of the concentrator 107 can be controlled without having to cause a displacement in the direction of the arrow J J J (figure g4), which would cause the displacement without mechanical components. This is desirable when In this way, each can only move as a whole,
Therefore, even in the case of conductor loops formed as a single unit, in which all concentrators installed on it must be carried along with them when moved, the individual concentrators may be affected differently. I can do it.

[Brief explanation of the drawing]

FIG. 1 shows the front entrance of a roller device having a roller provided with the device based on the present invention, FIG. 2 is a side view taken along the line ■-■ in FIG. 1, and FIG. Figure 8g4 is a cross-sectional view taken along line ■-■ in Figure 3, Figure 5 is a partially enlarged cross-sectional view taken along line v-v in Figure 3, and Figure 6 is a view parallel to the axis of the concentrator. FIG. DESCRIPTION OF SYMBOLS 1... Upper roller, 2... Lower roller, 3... Roller gap, 4... Band-shaped object, 5... Pressure heating device, 1
゜... Roller device, 11.12.13... Conductor loop, 20... Generator, 101... Roller gap, 102... Core, 103... Shell, IO2...
・Conductor loop, 104', 104"...leg, 1
06, 107... Concentrator, 108...
Legs, 1o9...dynamo play), 110...roller,
112... Insulating layer, 113... Bridge portion, 114
...Saturation coil, 12Q...Counter roller, 13
0... Band-shaped object, 131... Measurement sensor, 132 River control device, 133... Adjustment device, 134... Operation armor.

Claims (1)

[Claims] 1) A desired temperature distribution pattern is formed on the working surface of a roller for compressive heat treatment of a heated strip by circulating a pressure/heat transfer liquid medium that is hydraulically supported inside. A method for controlling temperature of a roller, the roller being additionally heated by electromagnetic induction so as to be controllable from the outside. 2) A roller having a roller that is hydraulically supported inside and heated by circulating a liquid medium for pressure and heat transfer therein, and a roller temperature adjustment device that forms a desired temperature distribution pattern on the working surface of the roller. A roller device with a roller temperature adjustment device, characterized in that the roller temperature adjustment device includes a generator and a conductor loop connected to the generator and provided close to the working surface of the roller. 3) A roller device with a roller temperature adjusting device according to claim 2, wherein the conductor loop is disposed immediately before a gap between the roller and a counter roller thereto. 4) A roller having a roller that is hydraulically supported internally and heated by circulating a liquid medium for pressure and heat transfer therein, and a roller temperature adjustment device that forms a desired temperature distribution pattern on the working surface of the roller. In the apparatus, the roller temperature regulating device includes a conductor loop having two legs extending over at least a portion of the roller proximate the working surface of the roller and parallel to the axis of the roller. , comprising a concentrator that is shorter than the leg and is provided on the leg and is configured to adjust the electromagnetic flux of the leg and concentrate the electromagnetic flux acting on the roller in a desired area. A roller device with a roller temperature adjustment device. 5) The roller device with roller temperature adjustment according to claim 4, wherein the concentrator is a concentrator movable in both or one of the axial direction and the radial direction of the roller. 6) The roller device with a roller temperature adjustment device according to claim 5, wherein the concentrator is a concentrator that is movable in the longitudinal direction of the leg. 7) The roller temperature adjustment device includes an adjustment device for moving the concentrator in response to a measured value detected from the strip processed by the roller. The described roller device with a roller temperature adjustment device. 8) At least one of the concentrators is provided with a saturation coil whose inflow current can be adjusted to bring part or all of the concentrator into a state of magnetic saturation. any one of
A roller device with a roller temperature adjustment device described in .