KR100559410B1 - Current roller for an electrolytic strip coating plant - Google Patents

Abstract

The present invention relates to a current roller for a band electrolytic coating installation with a roller axis (6), which current roller comprises a roller mantle (1) having an inner wall (4) and an outer wall (5), and a cylindrical cylindrical casing (11). ), Two cylindrical bodies (2, 3) filling the roller circumferential casing (1) by the side (9) facing each other and the side (10) facing each other, the roller circumferential casing (1) and the body ( 2, 3) are combined with each other to allow separation.

Description

CURRENT ROLLER FOR AN ELECTROLYTIC STRIP COATING PLANT}

The present invention relates to a current roller for band electrolytic coating equipment.

The current roller typically serves to return the current delivered from the coated anode to the band back to the rectifier. In that case, the current rollers are arranged differently for the horizontal band path and the vertical band path, respectively.

In the former case, the band to be coated is guided horizontally through the coating cell, wherein the current roller is placed before and after the coating cell and abuts the band from above or below and applies a linear compressive force to the band by a rubberized corresponding roller. do. When the circumferential speed of the roller coincides with the band speed, current is transmitted from the band to the current roller via the linear contact between the band and the current roller, and then back from the current roller to the rectifier via the slip ring system. .

In a vertical coating system, the band to be coated is diverted to 180 ° via a current roller, which at the same time also serves as a redirecting roller, after exiting from the coating cell, whereby the band can enter the subsequent coating cell. The current flows from the band to the current roller via a contact surface between the band and the current roller, and then back from the current roller to the rectifier via the slip ring system. In that case, the current roller not only serves to carry the current, but also serves to guide the band. Because of the bending strength of the bands and the mutual spacing of the coating cells is relatively large, the current rollers for vertical coating installations are formed with relatively large diameters.

The current rollers are heated due to the internal electrical resistance, and correspondingly the diameter of the current rollers is also increased. Another heat source is a winding band which is also heated by the distribution electrical resistance. If the thickness of the band is in the range of less than 1 mm, the temperature value of the band may exceed 100 ° C. and the current roller may also be heated accordingly.

For that reason, the current roller is typically cooled internally, the purpose of which is to ensure a uniform temperature distribution over the entire length of the current roller. This prevents the occurrence of different diameters due to the differently heated portions over the entire length of the current roller. In other words, such internal cooling results from the fact that the guidance of the band is no longer guaranteed and experience shows that the quality of the coated surface is also reduced.

Various configurations relating to the cooling of the current rollers are known in the prior art.

In the case of one of them, the current roller is formed in principle as a round hollow body, and the circumferential casing of the hollow body is made of an acid resistant conductive metal. The hollow body is partially or completely filled with cooling water in which cold water flows in through one roller pin and heated water flows out through another roller pin. Such configuration is less expensive, but involves the following disadvantages:

In the case of a fully filled roller, the heat transfer is small due to the low flow rate of the cooling water flowing toward the inner wall. In addition, as the amount of water is added, the moment of inertia of the roller is raised to hinder the drive control. In addition, a uniform temperature distribution over the entire length of the roller cannot also be guaranteed.

Another known construction scheme is to completely fill the hollow space with the drainage. Thereby, the potential quantity inside the current roller is reduced, but the problem that the control of cooling is not possible still remains.

Another configuration is known which avoids the above mentioned disadvantages. In that case, a narrowly wound copper tube is inserted into the concentric gap between the current roller circumferential casing made of special steel and the inner cylinder made of ordinary steel, through which the cooling water flows at a high flow rate. The remaining hollow space is cast from zinc metal to achieve heat transfer between the circumferential casing and the copper tube.

In such a construction scheme, controllable and uniform heat dissipation is ensured, but the manufacturing cost is significantly higher than in the foregoing scheme. Another disadvantage is that the refurbishment of the roller after several grinding of the roller circumferential casing due to abrasion can only be carried out in special workplaces, for example, by making a new circumferential casing that has already been cut to some extent in advance. This is because it has to shrink on the circumferential casing. That is, it is impossible to simply replace the old circumferential casing. Therefore, when operating the coating equipment, a large number of expensive current rollers must be reserved.

It is an object of the present invention to provide a current roller which avoids the above mentioned disadvantages, can be manufactured at low cost and effort, and does not need to stock an entire roller as a spare part.

The object consists of a roller circumferential casing, in which the current roller has an inner wall and an outer wall, and a cylindrical circumferential casing, two cylindrical bodies filling the roller circumferential casing by the side facing each other and the side facing each other. The main body is achieved by a current roller for a band electrolytic coating installation with a roller axis, which is joined to each other to enable separation.

Thereby, the roller circumferential casing itself can be easily replaced so that it is no longer necessary to stock the entire roller as a replacement part.

The current roller can be produced at a very low cost when the main body is made of conventional steel and the roller circumferential casing is made of an acid resistant and conductive material, such as special steel.

When the cylindrical circumferential casing of the main body is formed with electrical insulation, the current flow in the roller circumferential casing can be easily controlled. Thereby, uniform heating of the current roller can be ensured. Electrical insulation of the cylindrical circumferential casing can be achieved, for example, by the cylindrical circumferential casing having a hard layer with acid resistance and electrical insulation.

When an annular inner ring centered on the roller axis is arranged on the inner wall of the roller circumferential casing, on the one hand the engagement between the roller circumferential casing and the body is realized very simply, and on the other hand the electrical insulation of the cylindrical circumferential casing In conjunction, symmetrical electrical flow can be effected in the roller circumferential casing.

The separable fixing of the roller circumferential casing and the body is very simple in the case of a fixing element, for example a tension rod, having through holes extending parallel to the roller axis and communicating with each other.

Further advantages and details of the invention will become apparent from the following description of the claims and the following examples.

According to the accompanying drawings, the current roller for band electrolytic coating equipment consists of a roller circumferential casing 1 and two main bodies 2, 3. The roller circumferential casing 1 is hollow cylindrical and has an inner wall 4 and an outer wall 5. The roller circumferential casing 1 is made of a material which is acid resistant and conductive, for example special steel. The inner wall 4 of the roller circumferential casing 1 is welded with a concentric inner ring 7 about the roller axis 6. In that case, it will be clearly seen that the inner ring 7 is arranged centrally.

The main bodies 2 and 3 are formed substantially the same. The main bodies 2 and 3 are cylindrical, hollow inside, and have pins 8 on side surfaces that are external to each other, and can be supported by the pins 8 so as to be rotatable in bearings not shown. The main bodies 2 and 3 are made of ordinary steel. The main bodies 2, 3 fill the roller circumferential casing 1 substantially, preferably exactly exactly. That is, the main body 1 has a side surface 9 facing each other, a side surface 10 facing each other and a cylindrical cylinder casing 11 facing the roller circumferential casing 1.

The cylindrical circumferential casing 11 has a hard layer having acid resistance and electrical insulation. Such a hard layer may for example be made of ceramic oxide embedded with filler to prevent voids. Coating layers of that kind are simply applied at low cost. The hard layer not only protects the cylindrical circumferential casing 11 from corrosion by coolant (water), but also protects it from electrolytic vapor in some cases. That is, the cylindrical cylinder casing 11 is formed insulated electrically.

Because of the insulating layer between the main bodies 2, 3 and the roller circumferential casing 1, the entire current is later via one pin 8, or via another pin 8, or two It flows through the inner ring 7 regardless of whether it propagates via the pin 8 or not. That is, the entire current flows symmetrically from the outside to the center in the roller circumferential casing 1.

In that case, the roller circumferential casing 1 as well as the bodies 2, 3 are also arranged symmetrically with respect to the axis 6, which is hereinafter referred to as the roller axis.

The main bodies 2 and 3 have a through hole 12. Such through holes 12 extend parallel to the roller axis 6 and correspond to one another. The through hole 12 can be inserted, for example, with a tension rod 13, whereby the roller circumferential casing 1 and the bodies 2, 3 are screwed into the tension rod 13 by a screw nut 4. Can be combined with each other to enable separation. Thereby, the roller circumferential casing 1 can be replaced simply, if necessary, without the need to machine the entire current roller. That is, the stockpile of the replacement parts is limited to the roller circumferential casing 1 and is reduced.

The cylindrical circumferential casing 11 of the bodies 2, 3 has a cooling channel 15 for the flow of cooling liquid, for example water. The cooling channel 15 is formed as a spiral that rotates about the cylindrical circumferential casing 11. The cooling channel 15 of the main body 2 is formed as a left turning spiral, and the cooling channel 15 of the main body 3 is formed as a preferential spiral. However, the cooling channel 15 may be formed in other shapes. The circulation of the coolant is as follows:

The coolant is supplied to the current roller via the supply hole 16. The supply hole 16 of one main body 2 is located on the roller axis 6 and is disposed on the side surface 10 of the main body 2 which is external to the other main body 3. The coolant is then supplied to the first longitudinal hole 18 via the outer radial hole 17 (only one is shown in FIG. 2). The outer radial hole 17 is also arranged in the side face 10 of the body 2, which is also faced with the other body 3. The first longitudinal hole 18 extends parallel to the roller axis 6 below the cooling channel 15 and opens towards the inner ring 7. In addition, the outer radial hole 17 of the body 2 is closed between the cooling channel 15 and the first longitudinal hole 18, for example by welding or by screwing a screw plug.

The other body 3 also has a first longitudinal hole 19, which will be described later. The body 3 also has a second longitudinal hole 20 which likewise opens towards the inner ring 7 and extends parallel to the roller axis 6. The first longitudinal hole 18 of the body 2 is connected to the second longitudinal hole 20 of the other body 3 via a through hole arranged in the inner ring 7. The bodies 2, 3 also have inner radial holes 22 arranged in the side surfaces 9 of the bodies 2, 3 opposite to each other. The inner radial hole 22 connects the first longitudinal hole 18 of the body 2 or the second longitudinal hole 20 of the other body 3 to the cooling channel 15.

In such a path, a coolant, such as water, is supplied to the cooling channel 15. The coolant then flows helically from the inner ring 7 of the roller circumferential casing 1 to the outer end of the roller circumferential casing 1.

In order to drain the coolant from the cooling channel 15, the body 2 extends from the cooling channel 15 to the second longitudinal hole 24 of the body 2 on the side 10 facing away from the other body 3. It has an additional outer radial hole 23 that extends. The second longitudinal hole 24 of such a body 2 also extends parallel to the roller axis 6. The second longitudinal hole 24 opens towards the inner ring 7 and extends just before the side 10 of the body 2, which is faced with the other body 3. The second longitudinal hole 24 is connected to the first longitudinal hole 19 of the other body 3 already described above via an additional through hole 25 arranged in the inner ring 7.

The first longitudinal hole 19 of the other body 3 also extends parallel to the roller axis 6 below the cooling channel 15 and opens towards the inner ring 7. The first longitudinal hole 19 is in communication with the cooling channel 15 on one side and the feed hole 27 on the other side via the outer radial hole 26. The outer radial hole 26 of the other body 3 is already disposed in the side face 10 of the body 2 and the other body 3, which is externally oriented as its name suggests. The feed holes 27 arranged in the other main body 3 are located on the roller axis 6. Cooling water can exit the feed hole 27 and flow out of the current roller.

By the cooling liquid circulation described above, fresh and cool cooling liquid is first supplied to the central portion of the roller circumferential casing 1. Since a strong current flows in such a circumferential casing portion and the circumferential casing portion is the hottest, the most strongly heated portion is intensively cooled. In that case, the cylindrical shape of the roller circumferential casing 1 is also best maintained as it is.

However, it is also possible to guide the coolant back. In that case, the current rollers protrude convexly. It may be desirable for band paths.

The necessary sealing against the coolant outflow and the electrolyte inflow is carried out by conventional O-rings which can be easily replaced when needed.

In the current roller for band electrolytic coating equipment according to the present invention, the roller circumferential casing itself can be replaced so that it is not necessary to stock the entire current roller as a replacement part, the current roller can be manufactured at a very low cost, and the roller circumference The current flow in the casing can be symmetrically controlled.

1 is a view showing a current roller viewed in the roller axis direction;

2 is a cross-sectional view of the current roller of FIG. 1 along line II-II;

3 is a cross-sectional view of the current roller of FIG. 2 along line A-A,

4 is a cross-sectional view of the current roller of FIG. 3 along line B-B.

(Explanation of symbols for the main parts of the drawing)

1: Roller circumferential casing 2, 3: Body

4: inner wall 5: outer wall

6: roller axis 7: inner ring

9, 10: side 11: cylindrical cylindrical casing

12, 21, 25: through hole 13: fixed element

15 cooling channel 16, 27 supply hole

17, 22, 23: radial holes

Claims (14)

In the current roller for band electrolytic coating equipment having a roller axis (6), The current roller comprises a roller circumferential casing 1 having an inner wall 4 and an outer wall 5, which roller circumferential casings are external to the cylindrical bodies 2, 3 coaxially arranged opposite each other. Fixed around the surface, the main bodies 2 and 3 are coupled to each other so as to be separable, and the cylindrical cylindrical casing 11 of the main bodies 2 and 3 has a cooling channel 15 for cooling liquid. Current rollers for band electrolytic coating equipment. The current roller for band electrolytic coating equipment according to claim 1, wherein the main bodies (2, 3) are made of ordinary steel, and the roller circumferential casing (1) is made of an acid resistant and conductive material, such as special steel. . 2. The current roller for band electrolytic coating equipment according to claim 1, wherein the cylindrical circumferential casing (11) of the main body (2, 3) is made to be electrically insulated. 4. The current roller for band electrolytic coating equipment according to claim 3, wherein the cylindrical cylindrical casing (11) is provided with a hard, acid resistant and electrically insulating coating. 5. A band electrolytic coating installation as claimed in any one of the preceding claims, characterized in that the main bodies (2) and (3) and the roller circumferential casing (1) are combined with a precise fit. Impulse roller. 5. The inner wall 4 of the roller circumferential casing 1 is arranged with an inner ring 7 concentrically surrounding the roller axis 6. A current roller for a band electrolytic coating equipment characterized by the above-mentioned. 7. Current roller according to claim 6, characterized in that the inner ring (7) is welded to the roller circumferential casing (1). 7. The body (2) according to claim 6, characterized in that the bodies (2, 3) have through holes (12) corresponding to each other, extending parallel to the roller axis (6) for a fixing element, for example a tension rod (13). Current rollers for band electrolytic coating equipment. The method of claim 6, The cooling channel 15 is formed as a spiral surrounding the cylindrical cylinder casing 11, The main bodies 2 and 3 are provided on the roller axis 6 with supply holes 16 and 27 for supplying and discharging the coolant to the side surfaces 10 of the main bodies 2 and 3 which face each other. Equipped, The main bodies 2 and 3 have one or more outer radial holes 17 and 26 communicated with the respective supply holes 16 and 27 so as to face each other of the main bodies 2 and 3. 10) equipped with The main bodies 2, 3 are in communication with the outer radial holes 17, 26 and are open to the inner ring 7 and at least one first species extending parallel to the roller axis 6. Directional holes 18, 19 are provided below the cooling channel 15, The one or more outer radial holes 17 in one body 2 are closed between the cooling channel 15 and the one or more first longitudinal holes 18, The main body 2 has at least one inner radial hole 22 communicating with the at least one first longitudinal hole 18 on the side 9 facing the other main body 3, The main body 2 extends parallel to the roller axis 6 and opens toward the inner ring 7 and extends to the side 10 of this main body 2, which is external to the main body 3, the inner One or more second longitudinal holes 24 in communication with one or more first longitudinal holes 19 of the other body 3 via a first through hole 21 disposed in the ring 7, The body 2 has at least one additional outer radial hole 23, which extends from the cooling channel 15 to the at least one second longitudinal hole 24, the side 10 facing away from the other body 3. ), The other main body 3 extends in parallel to the roller axis 6 and is opened toward the inner ring 7 and via the second through hole 25 disposed in the inner ring 7 of the main body 2. One or more second longitudinal holes 20 in communication with the one or more first longitudinal holes 18, The at least one second longitudinal hole 20 of the body 3 passes through at least one inner radial hole 22 disposed at the side 9 of the other body 3 facing the body 2. And in communication with the cooling channel (15). In the cooling method of the current roller according to claim 9, The cooling liquid is supplied into the cooling channel 15 from the side portions 9 facing each other of the main bodies 2 and 3, and the sound cooling channel 15 from the side surfaces 10 facing each other of the main bodies 2 and 3. The current roller cooling method characterized in that flowed out. In the cooling method of the current roller according to claim 9, The cooling liquid is supplied into the cooling channel 15 from the mutually outer side portions 10 of the main bodies 2 and 3, and the cooling channel 15 from the opposite sides 9 of the main bodies 2 and 3. The current roller cooling method characterized in that flowed out. In the roller circumferential casing of a current roller for band electrolytic coating equipment, which comprises a roller circumferential casing axis 6, an inner wall 4 and an outer wall 5, and is made of an acid resistant and conductive material, such as special steel, An inner ring 7 arranged concentrically with respect to the roller circumferential casing axis 6 is arranged in the center of the inner wall 4 of the roller circumferential casing 1, The roller circumferential casing of the current roller for band electrolytic coating equipment, characterized in that the inner ring (7) has at least two through holes (21, 25) extending parallel to the roller circumferential casing axis (6) for the coolant. 13. The roller circumferential casing of the current roller for band electrolytic coating installation according to claim 12, characterized in that the inner ring (7) is welded to the roller circumferential casing (1). 14. The inner ring (7) according to claim 12 or 13, having a through hole (12) extending parallel to the roller circumferential casing axis (6) for a fixing element, for example a tension rod (13). A roller circumferential casing of a current roller for a band electrolytic coating equipment, characterized in that.