System for removing oxide skin of steel cord through non-contact alternate electrolytic pickling

Abstract

The utility model provides a system for removing oxide skin of a steel cord through non-contact alternate electrolytic pickling, which comprises a bottom tank body filled with sulfuric acid liquid for pickling; the two groups of pickling tanks adopt a 5 + 5 grouping design, and the two groups of pickling tanks are the same in electrode arrangement and are arranged according to a positive-negative-negative-negative-positive electrode sequence. Guide plates are arranged between the pickling tanks. The upper tank body of the pickling tank is erected above the bottom tank body and does not make direct contact with sulfuric acid, the sulfuric acid is pumped from the bottom tank body to the upper tank body through an independent lifting pump and circularly flows, and the sulfuric acid overflowing towards the two sides downwards flows into the bottom tank body under the action of a flow guide plate. The steel cord steel wire is located above the upper groove in the pickling process, makes contact with the ceramic carrier roller and does not make contact with a polar plate of the upper groove; sulfuric acid liquid serves as a conducting medium, the steel wire sequentially passes through the anode area and the cathode area after the polar plates are electrified, the steel wire serves as an opposite cathode or anode, electrochemical reaction is generated, non-contact alternate pickling is conducted on the steel wire, and surface oxide skin is removed.

Description

Technical Field

[0001] This invention relates to the field of steel cord production technology, and more particularly to a technical process for removing oxide scale from steel cord, specifically a system for non-contact alternating electrolytic pickling to remove oxide scale from steel cord. Background Technology

[0002] Steel cord is a type of fine-gauge steel wire or rope made of high-quality high-carbon steel with a brass-plated surface, and designed for special purposes. It is primarily used as a reinforcing material for passenger car tires, light truck tires, heavy-duty truck tires, construction machinery tires, aircraft tires, and other rubber products. Obtaining high-quality steel cord is crucial for the performance and safety of tires and other products during the manufacturing process.

[0003] The production process of steel cord is lengthy. After hot rolling and heat treatment, a layer of oxide scale, mainly composed of iron oxides, forms on its surface. The presence of this oxide scale increases the friction between the steel wire and the die during subsequent drawing processes, leading to increased drawing force. Excessive drawing force not only accelerates die wear but can also cause a decline in the surface quality of the steel cord, such as scratches, cracks, and even wire breakage. Therefore, pickling is necessary to remove the oxide scale from the surface of the steel cord before subsequent drawing processes.

[0004] Currently, the removal of oxide scale from steel cord mainly uses cathodic pickling or anodic pickling processes, both of which require contact conduction using conductive rollers. Under high current densities, the steel wires can be damaged by electrical sparks, resulting in surface damage. Furthermore, if the oxide scale on the steel wire surface is not thoroughly cleaned, the subsequent electroplating coating will have weak adhesion and is prone to peeling. Steel wires damaged by sparks will also experience breakage during drawing. Summary of the Invention

[0005] In view of the defects and deficiencies of the existing technology, the purpose of this invention is to provide a system for removing oxide scale from steel cord through non-contact alternating electrolytic pickling. The system utilizes the gas generated by the electrochemical reaction on the steel wire to loosen and peel off the iron oxide scale and dirt on the surface of the steel wire. At the same time, sulfuric acid chemically dissolves the iron oxide, thereby achieving the effect of removing oxide scale.

[0006] According to a first aspect of the present invention, a system for removing oxide scale from steel cord through non-contact alternating electrolytic pickling is provided, comprising:

[0007] The bottom tank is configured to accommodate multiple pickling tanks and be filled with sulfuric acid liquid for pickling.

[0008] The first group consists of the first five pickling tanks;

[0009] The second group is composed of the last five pickling tanks, the electrode arrangement of the pickling tanks in the first group and the second group is the same, and the electrodes are arranged in the order of positive-negative-negative-negative-positive, forming corresponding anode and cathode zones, and in the working process, one cathode zone of each group is closed as a standby zone;

[0010] Each pickling tank adopts the same structural design, and a flow guide plate is arranged between the pickling tanks;

[0011] The pickling tank comprises an upper tank, the upper tank is provided with an electrode plate connected with a power supply, and the upper tank is integrally installed above the side wall of the bottom tank body and does not directly contact the sulfuric acid liquid; the upper tank uses an independent lifting pump to pump the sulfuric acid liquid from the bottom tank body to the upper tank and circulate, and the sulfuric acid liquid overflowing to both sides flows downward into the bottom tank body under the action of the flow guide plate;

[0012] A pair of ceramic godets are arranged along the length direction of the side edge of the pickling tank, the steel cord steel wire is located above the upper tank during pickling, contacts the ceramic godet, and does not contact the electrode plate of the upper tank; the sulfuric acid liquid pumped into the upper tank is filled between the steel wire and the electrode plate, the sulfuric acid liquid is used as a conductive medium, the steel wire sequentially passes through the anode zone and the cathode zone after the electrode plate is electrified, the steel wire acts as a relative cathode or anode, an electrochemical reaction is generated, and the steel wire is subjected to non-contact alternating pickling to remove the surface oxide scale.

[0013] As an optional embodiment, the electrode plate of each pickling tank located in the cathode zone is connected to the negative terminal of the rectifier cabinet in a parallel manner;

[0014] The electrode plate of each pickling tank located in the anode zone is connected to the positive terminal of the rectifier cabinet in a parallel manner;

[0015] The rectifier cabinet controls the pickling current through a control system.

[0016] As an optional embodiment, a first group composed of the first five pickling tanks, the electrode plate of the pickling tank located in the cathode zone or the anode zone is connected to the first rectifier cabinet, and the pickling current of the first group is controlled by the first rectifier cabinet;

[0017] A second group composed of the last five pickling tanks, the electrode plate of the pickling tank located in the cathode zone or the anode zone is connected to the second rectifier cabinet, and the pickling current of the second group is controlled by the second rectifier cabinet.

[0018] As an optional embodiment, the middle position of the electrode plate of the pickling tank is provided with an opening.

[0019] As an optional embodiment, the opening is a long and narrow waist-shaped opening.

[0020] As an optional embodiment, the inner bottom surface of the bottom tank body is a slope, and the inclination angle is controlled to be 5°-15°.

[0021] As an optional embodiment, a cylinder along the vertical direction is arranged on one side of the upper tank of the pickling tank, a lifting pump is installed on the upper end of the cylinder, and the lower end of the cylinder is immersed in the sulfuric acid liquid in the bottom tank body. The lifting pump pumps the sulfuric acid liquid in the bottom tank body to the upper tank by driving the rotation of the propeller blade.

[0022] As an optional embodiment, the upper tank includes an upper tank body with a groove shape, and the polar plate is installed on the upper surface of the upper tank body.

[0023] The pair of ceramic godets are installed at the side positions of the upper tank body in the length direction through the godet frames, and the ceramic godets can freely rotate on the godet frames.

[0024] As an optional embodiment, the sulfuric acid overflowing from the upper tank by the lifting pump submerges the steel wire above the godet frame and overflows to both sides of the upper tank, flows into the bottom tank body after touching the flow guide plate, and suppresses the splashing of the sulfuric acid liquid.

[0025] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be seen as being part of the subject matter of the present disclosure, provided such concepts do not per se contradict each other. In addition, all combinations of the claimed subject matter are seen as part of the subject matter of the present disclosure.

[0026] The foregoing and other aspects, embodiments and features of the present teachings can be better understood from the following description of the present teachings taken in conjunction with the accompanying drawings. Other aspects, embodiments and features of the present teachings will be apparent from the description that follows, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical, or nearly identical, component that is illustrated in various figures is represented with a like numeral. For purposes of clarity, not every component is called out in every drawing. Embodiments of various aspects of the present teachings will now be described, by way of example and with reference to the drawings.

[0028] Figure 1 is a general schematic diagram of a steel cord non-contact alternating electrolytic pickling system for removing scale according to an embodiment of the present application.

[0029] Figure 2A 、 2B is a schematic diagram of a total of 10 pickling tanks of 5 in front + 5 in back according to an embodiment of the present application.

[0030] Figure 3 This is a schematic diagram of steel cord wires passing through an acid pickling tank according to an embodiment of the present invention.

[0031] Figure 4 It is based on Figure 3 The example shown is a magnified view of a single steel wire passing through the pickling tank.

[0032] Figure 5 This is a schematic diagram of the guide plate inside the bottom tank according to an embodiment of the present invention.

[0033] Figure 6 This is a side sectional view of the upper slot installed in the lower slot according to an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the overall structure of the upper slot according to an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the exploded structure of the upper slot according to an embodiment of the present invention.

[0036] Figure 9 This is a half-sectional view of the upper slot according to an embodiment of the present invention. Detailed Implementation

[0037] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0038] Various aspects of the invention are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily intended to encompass all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed herein are not limited to any particular implementation. Furthermore, some aspects of the invention disclosed may be used alone or in any suitable combination with other aspects of the invention disclosed.

[0039] {Example 1}

[0040] Combination Figures 1-9 As shown, the system for removing oxide scale from steel cord by non-contact alternating electrolytic pickling according to an embodiment of the present invention includes a bottom tank 100 and two sets of pickling tanks 10 disposed within the bottom tank 100.

[0041] like Figures 1-4 As shown, the bottom tank 100 is an open box structure made of corrosion-resistant material, used to accommodate multiple pickling tanks 10 and filled with sulfuric acid liquid for pickling.

[0042] In an embodiment of the present invention, the two sets of pickling tanks 10 adopt a 5+5 group design, with the first group consisting of the first five pickling tanks 10 and the second group consisting of the last five pickling tanks 10.

[0043] Combination Figure 1 As shown, the electrode arrangement of the pickling tank 10 in the first and second groups is the same, and they are arranged in the order of positive-negative-negative-negative-positive to form corresponding anode and cathode areas. During operation, one section of the cathode area is closed as a spare area.

[0044] Combination Figure 1 As shown, each pickling tank 10 located in the cathode area has its electrode plate 15 connected in parallel to the negative terminal of the rectifier cabinet; each pickling tank 10 located in the anode area has its electrode plate 15 connected in parallel to the positive terminal of the rectifier cabinet.

[0045] Therefore, a rectifier cabinet is used to control the pickling current through a control system.

[0046] In some alternative embodiments, a first group consisting of the first five pickling tanks 10 has its plates located in the cathode or anode region connected to a first rectifier cabinet, which controls the pickling current of the first group; a second group consisting of the last five pickling tanks 10 has its plates located in the cathode or anode region connected to a second rectifier cabinet, which controls the pickling current of the second group.

[0047] Therefore, each group has an independent rectifier cabinet to control the pickling current.

[0048] In the design of this invention, the total current range of each steel wire is controlled within 50 to 150A (the total current before and after), and the sulfuric acid concentration is controlled within 300 ± 50 g / l.

[0049] Combination Figures 3-9 As shown, each pickling tank 10 adopts the same structural design, and a guide plate 110 is set between the pickling tanks 10.

[0050] Combination Figures 7-9 As shown, the pickling tank 10 includes an upper tank 14, which is equipped with an electrode plate 15 connected to a power source. The upper tank 14 is mounted on the side wall of the bottom tank 100 and does not directly contact the sulfuric acid liquid. The upper tank 14 uses an independent booster pump to pump sulfuric acid liquid from the bottom tank 100 to the upper tank 14 and circulate it. The sulfuric acid liquid overflowing to both sides flows down into the bottom tank 100 under the action of the guide plate 110.

[0051] A cylinder 12 is arranged along the vertical direction on one side of the upper tank 14 of the pickling tank 10. The upper end of the cylinder 12 is provided with a lifting pump 13. The lower end of the cylinder 12 is immersed in the sulfuric acid liquid in the bottom tank body 100. The lifting pump 13 circulates and pumps the sulfuric acid liquid in the bottom tank body 100 to the upper tank 14 by rotating the driving propeller blade 13A.

[0052] The upper tank 14 includes an upper tank body 14A having a groove shape. The polar plate 15 is arranged on the upper surface of the upper tank body 14A. A pair of ceramic godets 16 are arranged on the side edges of the upper tank body 14A in the length direction via godet frames 17. The ceramic godets 16 can freely rotate on the godet frames 17.

[0053] In the embodiment of the present application, the independent lifting pump is used instead of the whole circulating pump. Each pickling tank independently uses a lifting pump. The pickling tanks are independent of each other and do not affect each other. Even if one stops working, the sulfuric acid of the other pickling tanks can still flood the steel wire, reducing the risk of the steel wire not being washed clean. The use of independent lifting pumps further increases the circulating capacity, so that the acid around the steel wire is constantly replaced, improving the pickling effect.

[0054] In combination with the pair of ceramic godets 16 arranged on the side edges of the pickling tank 10 in the length direction as shown in Figure 3 , Figure 4 and Figures 7-9 , the steel cord steel wire 1 is located above the upper tank 14 during pickling and is in contact with the ceramic godets 16 and is not in contact with the polar plate 15 of the upper tank 14. In combination with Figure 9 , the flow direction of the sulfuric acid liquid is shown. The space between the steel wire 1 and the polar plate 15 is filled with the sulfuric acid liquid pumped into the upper tank 14. The sulfuric acid liquid is used as the conductive medium. The steel wire sequentially passes through the anode area and the cathode area after the polar plate is electrified. The steel wire acts as the opposite cathode or anode, generating an electrochemical reaction to perform non-contact alternating pickling on the steel wire 1 to remove the surface scale.

[0055] The sulfuric acid pumped into the upper tank 14 by the lifting pump 13 surges to flood the steel wire 1 located above the godet frame 17 and flows to both sides of the upper tank 14. When overflowing to both sides, the sulfuric acid liquid flows downward into the bottom tank body 100 after touching the flow guide plate 110, thereby suppressing the splashing of the sulfuric acid liquid.

[0056] As an optional embodiment, an opening 15A is arranged at the middle position of the polar plate 15 of each pickling tank 10. In the preferred embodiment, the opening 15A is a long and narrow waist-shaped opening.

[0057] In this way, by digging a hole in the middle of the polar plate, the circulating capacity of the sulfuric acid is increased, and the silt on the surface of the polar plate can be flushed, prolonging the service life of the polar plate and improving the pickling effect of the steel wire.

[0058] As an optional embodiment, the inner bottom surface of the bottom groove body 100 is a slope 120 with an inclination angle of 5°-15°. Compared with the traditional flat bottom design of the groove, the present application designs the groove bottom as a slope, which utilizes the flowability of the slope itself and the circulating pump at the bottom of the groove to more easily pump out to the buffer tank and timely discharge the sludge, which is beneficial to the cleaning of the operator and ensures that the steel wire is in a relatively good pickling environment and improves the pickling quality.

[0059] The buffer tank can also be used for liquid preparation, and when the concentration of sulfuric acid is not enough, sulfuric acid is added and pumped into the bottom groove body by the circulating pump to continuously supplement the new sulfuric acid solution.

[0060] The steel cord non-contact alternating electrolytic pickling system for removing scale according to the above embodiments is used to realize non-contact alternating electrolytic pickling for removing scale of steel cord, and the process includes the following steps:

[0061] The first group composed of the first five pickling tanks 10 and the second group composed of the last five pickling tanks 10 are powered on;

[0062] The lifting pumps in the first group and the second group are started to pump the sulfuric acid solution to the upper tank 14, and the lifting pumps in one cathode area are closed respectively, and the cathode area is alternately closed and started during use to facilitate cleaning of the sludge at the bottom of the cathode area;

[0063] When running, the steel wire 1 continuously passes above the upper tank 14, contacts the ceramic supporting roller 16 and does not contact the electrode plate 15, the space between the steel wire 1 and the electrode plate 15 is filled with sulfuric acid solution, the sulfuric acid is used as a conductive medium, an electrochemical reaction occurs on the steel wire, the generated gas loosens and peels off the iron scale layer and dirt on the surface of the steel wire, and the sulfuric acid and the iron scale layer have a chemical dissolution effect to remove the scale.

[0064] The electrochemical reaction during power-on is as follows:

[0065] When the steel wire is a relative cathode, the electrode reaction is as follows:

[0066] 2H + +2e→H2↑;

[0067] When the steel wire is a relative anode, the electrode reaction is as follows:

[0068] SO4 2- →SO4+2e;

[0069] 2SO4+2H2O→2H2SO4+O2↑.

[0070] Thus, the effective removal of the oxide skin on the surface of the steel cord steel wire is realized, the pickling quality is improved, the subsequent coating adhesion on the surface of the steel cord steel wire is improved, the drawing efficiency is reduced, and the mold wear and the surface defects of the steel cord are reduced.

[0071] In combination Figure 1 As shown in the figure, in the present embodiment, the steel wire is located above the upper slot during operation, contacts the ceramic carrier roller, does not contact the polar plate, the steel wire is filled with sulfuric acid liquid between the polar plate, the sulfuric acid serves as a conductive medium, and the power supply anode plate is in the state of the front 5 (+--+) and the rear 5 (+--+). When working normally, each of the two groups of the front and rear is closed one section of the cathode zone, which can be closed by the circulating pump. Since the circulating pump is closed, there is no sulfuric acid conduction, so the pickling tank of this section is no longer powered, and this cathode zone is a standby zone. Thus, by alternately closing the cathode zone, the dirt on the polar plate is cleaned, and only two cathode zones are used during actual operation. Among the three cathode zones in each group, one is a standby, which is usually closed, which is helpful for observing and cleaning the sludge in the cathode tank (the sludge in the cathode zone is more).

[0072] It should be understood that, in Figure 1 In the example, the front 5 sections and the rear 5 sections are connected together in the circuit. In another embodiment, one rectifier cabinet is connected to each of the front 5 sections and the rear 5 sections to disperse the current, and 2 rectifier cabinets are used, which reduces the pressure of the rectifier cabinet.

[0073] Although the present application has been disclosed in the above preferred embodiments, it is not intended to limit the present application. Those skilled in the art can make various modifications and improvements without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A system for contactless alternate electrolytic pickling of steel cords for removal of scale, characterized in that, The application relates to a pickling device, which comprises the following parts: a bottom tank body (100) arranged for containing multiple pickling tanks (10) and filled with pickling sulfuric acid liquid; a first group composed of the first five pickling tanks (10); a second group composed of the last five pickling tanks (10), the pickling tanks (10) in the first group and the second group are arranged in the same electrode arrangement and are arranged in the electrode sequence of positive-negative-negative-negative-positive, forming corresponding anode zones and cathode zones, and in the working process, one pickling tank (10) in each cathode zone is closed as a standby zone; each pickling tank (10) adopts the same structural design, and a flow guide plate (110) is arranged between the pickling tanks (10); wherein the pickling tank (10) comprises an upper tank (14) provided with an electrode plate (15) connected with a power supply, the upper tank (14) is integrally arranged above the side wall of the bottom tank body (100) and does not directly contact the sulfuric acid liquid; the upper tank (14) uses an independent lifting pump to pump the sulfuric acid liquid in the bottom tank body (100) to the upper tank (14) and circulate, and the sulfuric acid liquid overflowing to both sides flows downward into the bottom tank body (100) under the action of the flow guide plate (110); the pickling tank (10) is provided with a pair of ceramic supporting rollers (16) along the length direction of the side edge, the steel cord steel wire (1) is located above the upper tank (14) in the pickling process, contacts the ceramic supporting roller (16) and does not contact the electrode plate (15) of the upper tank (14); the sulfuric acid liquid pumped into the upper tank (14) is filled between the steel wire (1) and the electrode plate (15) to serve as a conductive medium, the steel wire sequentially passes through the anode zone and the cathode zone after the electrode plate is electrified, the steel wire serves as a relative cathode or anode, an electrochemical reaction is generated, and the steel wire (1) is subjected to non-contact alternating pickling to remove the surface oxide scale.

2. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 1, characterized in that each pickling tank (10) located in the cathode zone is connected with a negative terminal of a rectifier cabinet in a parallel mode through the electrode plate (15); each pickling tank (10) located in the anode zone is connected with a positive terminal of the rectifier cabinet in a parallel mode through the electrode plate (15); the rectifier cabinet is controlled by a control system to control the pickling current.

3. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 1, characterized in that, the electrode plates of the pickling tanks (10) located in the cathode zone or the anode zone in the first group are connected with a first rectifier cabinet, and the pickling current of the first group is controlled by the first rectifier cabinet; the electrode plates of the pickling tanks (10) located in the cathode zone or the anode zone in the second group are connected with a second rectifier cabinet, and the pickling current of the second group is controlled by the second rectifier cabinet.

4. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 1, characterized in that, the middle positions of the electrode plates (15) of the pickling tanks (10) are provided with openings (15A).

5. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 4, characterized in that the opening (15A) is a long and narrow waist-shaped opening.

6. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 1, characterized in that, the inner bottom surface of the bottom tank body (100) is a slope.

7. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 6, characterized in that the inclination angle of the slope is 5-15 degrees.

8. The system for contactless alternate electrolytic pickling of steel cord for removal of scale according to any one of claims 1 to 7, characterized in that The upper tank (14) of the acid washing tank (10) is provided with a cylinder (12) along the vertical direction, the upper end of the cylinder (12) is provided with a lifting pump (13), the lower end of the cylinder (12) is immersed in the sulfuric acid liquid in the bottom tank body (100), the lifting pump (13) circulates and pumps the sulfuric acid liquid in the bottom tank body (100) to the upper tank (14) by rotating the driving propeller blade (13A).

9. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 8, characterized in that The upper tank (14) comprises an upper tank body (14A) with a groove shape, and a polar plate (15) is installed on the upper surface of the upper tank body (14A); The pair of ceramic godets (16) are installed on the side positions of the upper tank body (14A) in the length direction through godet frames (17), and the ceramic godets (16) can freely rotate on the godet frames (17).

10. The system for contactless alternate electrolytic pickling of steel cords for removal of scale according to claim 8, characterized in that The sulfuric acid liquid pumped to the upper tank (14) by the lifting pump (13) surges to submerge the steel wire (1) above the godet frame (17) and overflow to both sides of the upper tank (14), and flows into the bottom tank body (100) after touching the flow guide plate (110) when overflowing to both sides, thereby suppressing the splashing of the sulfuric acid liquid.

Images