Strip steel electrolytic polishing device and cold-rolled strip steel processing system

Abstract

The utility model relates to the technical field of strip steel surface cleaning, in particular to a strip steel electrolytic polishing device and a cold-rolled strip steel processing system. Comprising an electrolytic bath and conductive rollers located on the two sides outside the electrolytic bath body and used for conveying strip steel, the electrolytic bath is provided with a strip steel inlet, a strip steel outlet, an electrolyte inlet and an electrolyte outlet, a strip steel running channel is formed between the strip steel inlet and the strip steel outlet, and an electrode plate is arranged in the electrolytic bath. The conductive roller is connected with a positive electrode of an external power supply, the electrode plate is connected with a negative electrode of the external power supply, and the electrolytic bath is connected with an exhaust pipe. The device can clean the strip steel, and is connected with an external power supply through the conductive roller and the electrode plate to form an electrolysis loop, so that rust and iron powder on the surface of the strip steel are removed, residues and spots after cold rolling of the strip steel are thoroughly removed, the cleanliness of the surface of the strip steel is greatly improved, and the quality of the strip steel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel surface cleaning, in particular to a strip steel electrolytic polishing device and a cold-rolled strip steel processing system. Background Art

[0002] In the current situation of overcapacity in the steel market, users have higher and higher requirements for product quality, and the same is true for relatively high-end cold-rolled plates. The surface cleanliness of cold-rolled strip is an important measure of the surface quality of cold-rolled strip, and to a certain extent determines the product grade of cold-rolled strip. For cold-rolled strip production, a multi-stage cleaning process is often used before annealing to improve the surface cleanliness of the strip, including alkali spraying, alkali brushing, water brushing and water washing. This process can effectively remove the rolling oil or emulsion remaining on the surface, but it cannot remove the surface rust and residual iron powder. After annealing and coating, obvious white spots will still form on the surface of the strip, resulting in low product quality grade and affecting the benefits of the steel plant. Therefore, there is an urgent need for a strip electrolytic polishing device to improve the surface cleanliness of the strip. Utility Model Content

[0003] In order to solve the above problems, on the one hand, the utility model provides a strip electrolytic polishing device, comprising an electrolytic cell and conductive rollers for strip transmission located on both sides of the electrolytic cell body, the electrolytic cell being provided with a strip inlet, a strip outlet, an electrolyte inlet and an electrolyte outlet, a strip running channel being formed between the strip inlet and the strip outlet, an electrode plate being provided in the electrolytic cell, the conductive roller being connected to the positive pole of an external power supply, the electrode plate being connected to the negative pole of the external power supply, and an exhaust pipe being connected to the electrolytic cell.

[0004] Furthermore, the electrode plate includes an upper electrode plate located above the strip steel running channel, and / or a lower electrode plate located below the strip steel running channel.

[0005] Furthermore, the lower electrode plate and the upper electrode plate are arranged in one-to-one correspondence; the upper electrode plate and the lower electrode plate on the corresponding side are connected in parallel to the negative pole of the external power supply on the corresponding side.

[0006] Furthermore, there are a plurality of upper electrode plates, and a first insulating mechanism is provided between adjacent upper electrode plates; and there are a plurality of lower electrode plates, and a second insulating mechanism is provided between adjacent lower electrode plates.

[0007] Furthermore, the electrode plate is connected with an adjusting device for adjusting the distance between the electrode plate and the strip steel running channel.

[0008] Furthermore, the electrode plate is a carbonaceous electrode plate.

[0009] Furthermore, guide rollers for guiding the strip steel are provided in the electrolytic cell.

[0010] Furthermore, a stirrer is provided in the electrolytic tank.

[0011] Furthermore, the exhaust pipe is connected to a gas storage tank.

[0012] On the other hand, the utility model also provides a cold-rolled strip processing system, comprising a strip cold rolling unit, an alkali washing unit, and a water washing unit arranged in sequence, wherein the strip electrolytic polishing device as described above is arranged between the alkali washing unit and the water washing unit.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0014] 1) The strip electrolytic polishing device provided by the utility model can further clean the strip on the basis of alkali cleaning of the strip, and is connected to an external power supply through a conductive roller and an electrode plate to form an electrolytic circuit to remove rust and iron powder on the surface of the strip, and thoroughly remove residues and stains after cold rolling of the strip, thereby greatly improving the cleanliness of the strip surface and improving the quality of the strip.

[0015] 2) The strip electrolytic polishing device provided by the utility model can electrolytically polish the upper and lower surfaces of the strip at the same time through the upper electrode plate and the lower electrode plate, which can improve the strip polishing efficiency; two sets of upper electrode plates and lower electrode plates can be set, one for backup and the other for use, which increases the operating time and replacement cycle, facilitates regular cleaning of the electrode plate surface, and does not affect the electrolytic polishing of the strip.

[0016] 3) The strip electrolytic polishing device provided by the utility model has an electrode plate that can be raised and lowered, and the distance between the electrodes can be adjusted to adjust the reaction intensity according to demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a schematic structural diagram of a strip steel electrolytic polishing device provided by the present invention.

[0019] 1-electrolytic cell; 2-external power supply; 3-strip steel; 4-conductive roller; 5-exhaust pipe; 6-upper electrode plate; 7-lower electrode plate; 8-switch; 9-insulating baffle; 10-lifting mechanism; 11-guide roller; 12-agitator. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0021] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside" and "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0024] Example 1

[0025] As the instruction manual Figure 1 As shown, the utility model provides a strip electrolytic polishing device, including an electrolytic cell 1 and conductive rollers 4 for transmitting strip steel 3 located on both sides of the outer body of the electrolytic cell 1, the electrolytic cell 1 is provided with a strip steel inlet, a strip steel outlet, an electrolyte inlet and an electrolyte outlet, a strip steel running channel is formed between the strip steel inlet and the strip steel outlet, an electrode plate is provided in the electrolytic cell 1, the conductive rollers 4 are connected to the positive electrode of the external power supply 2, the electrode plate is connected to the negative electrode of the external power supply 2, and the electrolytic cell 1 is connected to an exhaust pipe 5.

[0026] Specifically, the number of the conductive rollers 4 is two, which are respectively arranged on both sides outside the electrolytic cell 1 for conveying and conducting the steel strip 3. The conductive rollers 4 can be installed on the electrolytic cell 1, or can be arranged away from the electrolytic cell 1; the electrolytic cell 1 is provided with an electrolytic chamber for carrying an electrolyte, and the electrolyte is preferably an acidic electrolyte, preferably perchloric acid, acetic acid or a mixture of the two. The steel strip 3 is transported by one of the conductive rollers 4 through the steel strip inlet into the electrolytic chamber and out through the steel strip outlet, and then transported to the next process by another conductive roller 4. The electrolytic cell 1 is provided with an electrolyte inlet, which can be used for replacing or replenishing the electrolyte; the conductive roller 4 is connected to the positive electrode of the external power supply 2, so that the steel strip 3 in contact with the conductive roller 4 forms an anode, and the electrode plate is connected to the negative electrode of the external power supply 2, and the electrode plate forms a cathode. The electrode plate is preferably an inert electrode plate, such as a carbon electrode or a Pt electrode, etc. The steel strip 3, the electrode plate and the electrolyte constitute an electrolytic cell, and the following electrochemical reactions occur:

[0027] Fe-2e - =Fe 2+ ,

[0028] 2H + +2e - =H2,

[0029] Fe3O4+8H + =Fe 2+ +2Fe 3+ +4H2O,

[0030] At the anode, the strip forms Fe 2+ The strip steel 3 is dissolved in the electrolyte, and the stains and iron powder on the surface of the strip steel 3 are also dissolved in the electrolyte; at the cathode, the hydrogen ions in the electrolyte generate hydrogen through an electrochemical reaction and are discharged through the exhaust pipe 5; after the strip steel is electrolytically polished in this application, there will be some residual electrolyte on the surface, the main components of which are various acids that are easily soluble in water, which can be effectively removed by water brushing and water rinsing, and will not bring about difficult-to-handle residual substances, so it will not increase additional production costs.

[0031] Preferably, according to the cleaning requirements of the steel strip 3, if it is necessary to clean the upper surface of the steel strip 3, an electrode plate may be arranged above the steel strip running channel, and the electrode plate, the upper surface of the steel strip 3 and the electrolyte constitute an electrolytic cell, and the upper surface of the steel strip 3 is electrolytically polished; if it is necessary to clean the lower surface of the steel strip 3, an electrode plate may be arranged below the steel strip running channel, and the electrode plate, the lower surface of the steel strip 3 and the electrolyte constitute an electrolytic cell, and the lower surface of the steel strip 3 is electrolytically polished; of course, preferably, electrode plates are arranged above and below the steel strip running channel, that is, electrode plates are arranged on the upper and lower sides of the steel strip 3, and the electrode plates, conductive rollers 4 are electrically connected to the external power supply 2 as required to clean the upper and lower surfaces of the steel strip 3.

[0032] In an optimized implementation mode, the electrode plate is located above the strip running channel, and / or below the strip running channel. The electrode plate located above the strip running channel is the upper electrode plate 6, and the electrode plate located below the strip running channel is the lower electrode plate 7. At the same time, two external power supplies 2 are provided, and the upper electrode plate 6 and the lower electrode plate 7 are respectively connected to the external power supplies 2 on the corresponding sides.

[0033] As one of the specific implementations, a group of upper and lower electrode plates can be set, or multiple groups of upper and lower electrode plates can be set, and the upper electrode plates 6 and the lower electrode plates 7 are set in a one-to-one correspondence; in this embodiment, the number of the upper electrode plates 6 and the lower electrode plates 7 is two, and the lower electrode plates 7 and the upper electrode plates 6 are set in a one-to-one correspondence, the lower electrode plate 7 is connected to the bottom of the electrolytic cell 1, and the lower electrode plate 7 is located below the strip steel 3, and the upper electrode plate 6 is connected to the top of the electrolytic cell 1, and the upper electrode plate 6 is located above the strip steel 3; the upper electrode plate 6 and the lower electrode plate 7 on the corresponding side are connected in parallel to the negative pole of the external power supply 2 on the corresponding side, as shown in the attached manual Figure 1 As shown, an external power supply 2 is respectively provided on the corresponding conductive rollers 4 on both sides of the electrolytic cell 1, the conductive roller 4 on the left is electrically connected to the positive pole of the external power supply 2 on the left, the upper electrode plate 6 and the lower electrode plate 7 on the left are connected to the negative pole of the external power supply 2 on the left, and the connection method on the right side is the same and will not be repeated again. The left side in this embodiment refers to the left side of the electrolytic cell 1, and the right side refers to the right side of the electrolytic cell 1; a switch 8 is provided on the circuit between the external power supply 2 and the upper electrode plate 6 and the lower electrode plate 7, which can control the conduction and disconnection of the corresponding circuit. Preferably, a switch is also provided on the circuit between the external power supply 2 and the conductive roller 4.

[0034] Preferably, the current and voltage of the external power supply 2 can be determined according to actual conditions and can also be adjusted during use.

[0035] In this embodiment, the electrode plates are carbonaceous electrode plates, and four carbonaceous electrode plates are arranged in the electrolytic cell. Precipitation may form on the surface of the electrode plates during operation, so one group of upper electrode plates 6 and lower electrode plates 7 can be operated, and another group of upper electrode plates 6 and lower electrode plates 7 can be used as standby, so as to facilitate regular cleaning of the electrode plates. Specifically, the upper electrode plate 6 on the left and the lower electrode plate 7 on the right can be opened at the same time to clean the upper and lower surfaces of the steel strip 3, or the lower electrode plate 7 on the left and the upper electrode plate 6 on the right can be opened at the same time to clean the upper and lower surfaces of the steel strip 3.

[0036] Preferably, the electrolytic cell 1 is a sealed container, and contains electrolyte, but the electrolyte cannot be filled to the brim to avoid excessive pressure in the electrolytic cell 1 caused by gas generated by the electrochemical reaction. The electrolyte should preferably immerse the upper electrode plate 6.

[0037] In an optimized implementation mode, a first insulating mechanism is provided between the two upper electrode plates 6 , and a second insulating mechanism is provided between the two adjacent lower electrode plates. Specifically, the first insulating mechanism and the second insulating mechanism are preferably insulating baffles, and the insulating baffles are installed on the electrolytic cell 1 .

[0038] In an optimized implementation mode, the electrode plate is connected with an adjusting device for adjusting the distance between the electrode plate and the strip steel running channel, and the adjusting mechanism may adopt a manual adjusting device or a mechanical adjusting device, and the distance between the electrode plate and the strip steel is adjusted by the adjusting device.

[0039] As one of the specific implementations, the electrode plate is connected to the electrolytic cell 1 through a lifting mechanism 10. Specifically, the upper electrode plate 6 and the lower electrode plate 7 are respectively connected to the electrolytic cell 1 through the lifting mechanism 10. The position of the electrode plate can be adjusted in the vertical direction, and then the distance between the electrode plate and the steel strip 3 is adjusted. The closer the distance between the electrode plate and the steel strip 3, the more intense the electrochemical reaction. Conversely, the farther the distance between the electrode plate and the steel strip 3, the weaker the electrochemical reaction. The position of the electrode plate can be adjusted according to the cleaning needs of the steel strip 3.

[0040] Specifically, the lifting mechanism 10 can be a lifting bracket, or lifting equipment such as a screw rod, a hydraulic rod, etc., and the screw rod and the hydraulic rod are insulated; of course, the lifting mechanism 10 can also be a spring.

[0041] As one of the specific implementations, the lifting bracket includes a telescopic rod, and the electrode plate is arranged at the end of the telescopic rod. The position of the electrode plate can be adjusted by adjusting the telescopic rod.

[0042] In an optimized implementation mode, the electrode plate is a carbonaceous electrode plate.

[0043] Preferably, the electrolyte is perchloric acid and / or acetic acid. In this embodiment, a mixed solution of perchloric acid and acetic acid is used as the electrolyte to remove the emulsion spots on the surface of the steel strip.

[0044] The optimized implementation mode also includes a guide roller 11 for guiding the steel strip 3, and the guide roller 11 is arranged in the electrolysis chamber. Specifically, the guide roller 11 is arranged in the electrolytic cell 1, and the guide roller 11 carries the steel strip 3 and is used for steering and guiding the steel strip 3. The guide roller 11 is installed on the electrolytic cell 1.

[0045] In an optimized implementation mode, a stirrer 12 is provided in the electrolytic cell 1 .

[0046] In this embodiment, a plurality of agitators 12 are evenly distributed in the electrolytic cell 1, and the agitators 12 remain turned on when the polishing device is working to ensure that the electrolyte composition in the electrolytic cell 1 is evenly distributed, especially to ensure that the electrolyte composition near the electrode plate and the strip steel 3 is even, so as to ensure the electrochemical reaction.

[0047] In an optimized implementation mode, an electrolyte inlet and an electrolyte outlet are provided on the electrolytic cell 1, and the electrolyte inlet is connected to an electrolyte storage tank. As the electrolysis process continues, the electrolyte will be consumed, and the electrolyte can be supplemented or replaced through the electrolyte inlet; preferably, a liquid level sensor can be provided in the electrolytic cell 1, and when the liquid level of the electrolyte is less than a minimum threshold, replenishment begins, and when the liquid level reaches a maximum threshold, replenishment stops.

[0048] In an optimized implementation mode, the electrochemical reaction in the electrolytic cell 1 will generate hydrogen, and the generated gas can be discharged from the electrolytic cell through the exhaust pipe 5. A gas storage tank can be connected to the exhaust pipe 5 for storing hydrogen so as to utilize the hydrogen as a resource; of course, the gas storage tank may not be provided, and the hydrogen can be ignited at the end of the exhaust pipe 5 to consume the hydrogen.

[0049] Example 2

[0050] The utility model also provides a cold-rolled steel strip processing system, comprising a steel strip cold rolling unit, an alkali washing unit, and a water washing unit which are arranged in sequence, wherein the steel strip electrolytic polishing device as described above is arranged between the alkali washing unit and the water washing unit.

[0051] Preferably, the steel strip after cold rolling in the steel strip cold rolling unit is washed by the alkali washing unit, and the oil stains on the surface are cleaned, and then enters the electrolytic cell 1. The upper surface of the steel strip 3 forms an electrolytic cell with the upper electrode plate 6 through the external power supply 2 and the electrolyte, and the lower surface of the steel strip also forms an electrolytic cell with the lower electrode plate 7 through the external power supply 2 and the electrolyte, and an electrochemical reaction occurs. At the anode, the steel strip 3 forms Fe 2+ The iron powder and the stains on the surface of the steel strip 3 are dissolved in the electrolyte. At the cathode, the hydrogen ions in the electrolyte generate hydrogen through electrochemical reaction and are discharged through the exhaust pipe 5. After the steel strip is electrolytically polished by the device, some residual electrolyte will be attached to the surface. The main components are various acids that are easily soluble in water. They can be effectively removed by water brushing and water rinsing in the water washing unit. No difficult-to-handle residual substances will be generated, and therefore no additional production costs will be added.

[0052] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the attached claims.

Claims

1. A strip electrolytic polishing device, characterized in that: It includes an electrolytic cell and conductive rollers for strip steel transmission located on both sides of the electrolytic cell body, the electrolytic cell is provided with a strip steel inlet, a strip steel outlet, an electrolyte inlet and an electrolyte outlet, a strip steel running channel is formed between the strip steel inlet and the strip steel outlet, an electrode plate is provided in the electrolytic cell, the conductive rollers are connected to the positive electrode of an external power supply, the electrode plate is connected to the negative electrode of the external power supply, and the electrolytic cell is connected to an exhaust pipe.

2. The strip electrolytic polishing device according to claim 1, characterized in that: The electrode plate comprises an upper electrode plate located above the strip steel running channel, and / or a lower electrode plate located below the strip steel running channel.

3. The strip electrolytic polishing device according to claim 2, characterized in that: The lower electrode plate and the upper electrode plate are arranged in one-to-one correspondence; the upper electrode plate and the lower electrode plate on the corresponding side are connected in parallel to the negative pole of the external power supply on the corresponding side.

4. The strip electrolytic polishing device according to claim 2, characterized in that: There are multiple upper electrode plates, and a first insulating mechanism is provided between adjacent upper electrode plates; there are multiple lower electrode plates, and a second insulating mechanism is provided between adjacent lower electrode plates.

5. The strip electrolytic polishing device according to claim 1, characterized in that: The electrode plate is connected with an adjusting device for adjusting the distance between the electrode plate and the strip steel running channel.

6. The strip electrolytic polishing device according to claim 1, characterized in that: The electrode plate is a carbonaceous electrode plate.

7. The strip electrolytic polishing device according to claim 1, characterized in that: A guide roller for guiding the strip steel is arranged in the electrolytic cell.

8. The strip electrolytic polishing device according to claim 1, characterized in that: A stirrer is arranged in the electrolytic tank.

9. The strip electrolytic polishing device according to claim 1, characterized in that: The exhaust pipe is connected with a gas storage tank.

10. A cold-rolled steel strip processing system, comprising a steel strip cold rolling unit, an alkali washing unit, and a water washing unit arranged in sequence, characterized in that: The strip electrolytic polishing device according to any one of claims 1 to 9 is arranged between the alkali washing unit and the water washing unit.

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