Cleaning line for copper and copper alloy thin strip production

Abstract

The utility model belongs to the technical field of copper and copper alloy processing equipment, and discloses a cleaning line for copper and copper alloy thin strip production, which comprises an uncoiling device and a coiling device which are arranged on a first layer, and a degreasing device, a pickling device, a fine brushing device, a passivating device and a drying device which are sequentially arranged on a second layer, a copper strip coil is sequentially subjected to uncoiling and threading, degreasing, acid pickling, fine brushing and grinding, passivating and coiling to complete cleaning. According to the device, degreasing, cleaning and passivating in strip production are integrated, and residual oil on the surface of the strip after annealing can be effectively cleaned.

Description

Technical Field

[0001] This utility model belongs to the technical field of copper and copper alloy processing equipment, and specifically relates to a cleaning line for the production of copper and copper alloy thin strips. Background Technology

[0002] For copper and copper alloy strip processing, cleaning line equipment plays a crucial role in improving product surface quality. Existing production processes generally fall into two categories: 1. Horizontal continuous casting (continuous extrusion) → milling → rough rolling → longitudinal shearing of medium-thick strip → annealing → finish rolling → annealing → cleaning → finished product slitting → packaging. 2. Semi-continuous casting → hot rolling → milling → rough rolling → longitudinal shearing of medium-thick strip → annealing → finish rolling → annealing → cleaning → finished product slitting → packaging.

[0003] Because the rolling process uses emulsions or rolling oils as lubricating and cooling media, ash is generated during annealing or residual oil remains on the surface of the coil, resulting in poor surface quality and even oxidation. Secondly, prolonged storage of the finished product or leakage of protective gas during annealing can cause oxidation and blackening of the strip surface, directly affecting the surface quality of the product and its performance for customers. Therefore, cleaning lines are an essential part of copper alloy strip production, playing a crucial role in removing residual oil, oxide scale, and ash generated during annealing.

[0004] Existing copper strip cleaning production lines, such as those published in CN204174285U and CN220364592U, provide a solution for the production of medium-thick strip products. These lines mainly include uncoiling, dry brushing, pickling, water bath, water brushing, passivation, squeezing, drying, and rewinding. However, they are insufficient for thin strip production. The finishing mill rolling process uses full oil lubrication, inevitably leaving residual oil on the strip surface after annealing. Based on this, we propose a cleaning line for the production of copper and copper alloy thin strips. Utility Model Content

[0005] The purpose of this invention is to provide a cleaning line for the production of copper and copper alloy thin strips, aiming to solve the problems existing in the prior art mentioned above.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A cleaning line for the production of copper and copper alloy strip includes an unwinding device and a winding device on the first layer, and a degreasing device, an acid pickling device, a fine brushing device, a passivation device and a drying device arranged in sequence on the second layer. The copper strip roll is cleaned by unwinding, threading, degreasing, acid pickling, fine brushing and grinding, passivation and winding in sequence.

[0008] Furthermore, the uncoiling device includes a feeding trolley, an uncoiling machine, a first deflection roller, a first hydraulic shear, a sewing machine, and a front S-roll group. The hydraulic shear is used to cut the strip ends, the sewing machine adopts a pull-button sewing structure, and the front S-roll group is used to adjust the tension of the copper strip coil.

[0009] Furthermore, the degreasing device includes a second deflecting roller, a first squeezing roller, a pre-spray degreasing box, a degreasing brush box, and a cold water rinsing box. The first squeezing roller is used to squeeze the strip dry and drive the strip to move. The pre-spray degreasing box and the degreasing brush box are used to degrease the strip. The cold water rinsing box is used to rinse the degreasing agent off the surface of the strip.

[0010] Furthermore, the pickling device includes a pickling tank and a spray chamber. The pickling tank is equipped with a lift pump and a circulating filter pump. The pickling tank has a two-layer structure, with acid solution in the first layer. The lift pump is used to lift the acid solution to the second layer of pickling strip, and the circulating filter pump is used to drive the acid solution to circulate and filter.

[0011] Pickling adopts a through-type immersion pickling method; when only degreasing and passivation are required, the acid solution is in the lower layer of the acid tank and does not come into contact with the strip, so as to adapt to the requirements of different cleaning processes.

[0012] Furthermore, the fine brushing device includes a primary brush box, a secondary brush box, and a tertiary brush box arranged in sequence, and the fine brushing device is used for strip polishing.

[0013] The fine brushing device is equipped with a three-stage brush box, which can select different brush rollers according to different product requirements, and polish and grind the surface of the strip in a targeted manner to improve the surface quality of the product.

[0014] Furthermore, the passivation device includes a second squeeze roller, a hot water spray box, a passivation box, a hot water rinsing box, and a 3M squeeze roller arranged in sequence. The passivation box passivates the surface of the strip with a passivating agent, and the hot water rinsing box and the hot water spray box are both used to rinse the strip.

[0015] Furthermore, the winding device includes a rear S-roll group, a second hydraulic shear, an EPC centering device, a winding machine, and an unloading trolley arranged in sequence. The rear S-roll group is used to control the tension of the strip, and the EPC centering device is used to fine-tune the base of the winding machine to center the edges of the strip.

[0016] Furthermore, it also includes an acid-base mist extraction device, which is connected to the degreasing device, the pickling device and the passivation device respectively, for extracting and processing alkali mist and acid mist.

[0017] Furthermore, the brush box is equipped with brush rollers and reverse pressure rollers arranged opposite each other. The brush rollers are made of non-woven fabric or abrasive. The brush box is equipped with nozzles for rinsing the strip and the surface of the brush rollers.

[0018] The present invention has the following beneficial effects.

[0019] 1. This utility model proposes a cleaning line for the production of copper and copper alloy thin strips, which integrates degreasing, cleaning, and passivation of strip production into one unit. It can effectively clean residual oil on the surface of the strip after annealing, and the cleaning method can be selected according to different needs. The pickling device is divided into upper and lower layers. The lower layer stores the liquid. During operation, the lower layer of acid liquid is lifted to the second layer of the pickling tank by a booster pump for pickling. The pickling adopts a through-type immersion pickling. When only degreasing and passivation are required, the acid liquid is in the lower layer of the acid tank and does not come into contact with the strip, so as to adapt to the requirements of different cleaning processes. After degreasing and pickling, most of the oil stains and oxide layers of the strip can be removed. The fine brushing device is equipped with a three-stage brush box, which can select different brush rollers for different product requirements to polish and grind the surface of the strip in a targeted manner, thereby improving the surface quality of the product. The equipment adopts a double-layer design, which can reduce the floor space and save production costs.

[0020] 2. By installing multiple sets of squeezing rollers at the degreasing, pickling, and passivation units, the medium from the previous stage can be squeezed dry, preventing the medium from entering the next stage with the strip, reducing the risk of medium contamination, reducing the frequency of medium replacement, increasing the service life of the medium, and reducing production costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the cleaning line used in the production of copper and copper alloy thin strips in this utility model.

[0022] Figure 2 This is a top view schematic diagram of the two-layer structure in this utility model.

[0023] Figure 3 This is a top view schematic diagram of the single-layer structure in this utility model.

[0024] Figure 4 This is a schematic diagram of the brush box structure in this utility model.

[0025] In the diagram: 1. Uncoiling device; 11. Feeding trolley; 12. Uncoiling machine; 13. First deflecting roller; 14. First hydraulic shear; 15. Sewing machine; 16. Front S-roll group; 2. Degreasing device; 21. Second deflecting roller; 22. First squeezing roller; 23. Pre-spray degreasing box; 24. Degreasing brush box; 25. Cold water rinsing box; 3. Pickling device; 31. Pickling tank; 32. Liquid collection tray; 33. Lifting pump; 34. Rubber-coated roller; 35. Circulating filter pump; 36. Pickling spray chamber; 4. Fine brushing device; 41. Primary brush box; 411. Brush roller; 412. Reverse pressure roller; 413. Nozzle; 42. Secondary brush box; 43. Tertiary brush box; 5. Passivation device; 51. Second squeeze roller; 52. Hot water spray box; 53. Passivation box; 54. Hot water rinsing box; 55. 3M squeeze roller; 6. Drying device; 61. Drying box; 62. Cooling box; 7. Rewinding device; 71. Rear S-roll group; 72. Second hydraulic shear; 73. EPC centering device; 74. Rewinder; 75. Unloading trolley; 8. Acid and alkali mist suction device. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Reference Figure 1 A cleaning line for the production of copper and copper alloy strip includes an uncoiling device 1, a degreasing device 2, an acid pickling device 3, a fine brushing device 4, a passivation device 5, a drying device 6, and a winding device 7 arranged sequentially along the strip cleaning and conveying direction. The cleaning line adopts a double-layer structure, with the uncoiling device 1 and the winding device 7 arranged on the first layer, and the degreasing device 2, the acid pickling device 3, the fine brushing device 4, the passivation device 5, and the drying device 6 arranged on the second layer.

[0028] The uncoiling device 1 includes a feeding trolley 11, an uncoiler 12, a first deflection roller 13, a first hydraulic shear 14, a sewing machine 15, and a front S-roll group 16. The feeding trolley 11 is equipped with a storage platform, and the uncoiler 12 is equipped with a pressure roller to prevent the coil from loosening during uncoiling. The first deflection roller 13 is used to assist in changing the direction of the strip. The first hydraulic shear 14 is used to cut the strip to facilitate sewing. The sewing machine 15 adopts a pull-button sewing structure and is equipped with upper and lower punches, a pressing mechanism, a guide plate, and a felt brake. When the strip is sewn, the position is recorded and fed back to the PLC to ensure that the sewing head can automatically lift when passing through the rubber roller, reducing damage to the machine roller group. The front S-roll group 16 consists of two S-rolls and one deflection roller, which is used to adjust the tension of the uncoiling and degreasing section to ensure the degreasing effect of the strip.

[0029] Reference Figure 2The degreasing device 2 includes a second deflecting roller 21, a first squeezing roller 22, a pre-spray degreasing box 23, a degreasing brush box 24, and a cold water rinsing box 25. The second deflecting roller 21 is used to adjust the strip direction; the squeezing roller 22 prevents the degreasing agent solution from overflowing into the pre-spray degreasing box 23 and provides power for the strip movement; the pre-spray degreasing box 23 is mainly used for pre-treating the grease on the strip surface; the degreasing brush box 24 is equipped with a cleaning brush roller, a reverse pressure roller, a spray pipe, and nozzles. The cleaning brush roller has PA612 bristles with a diameter of 0.4 mm, and the reverse pressure roller is coated with alkali-resistant rubber. An ammeter displays the brush roller current in real time, and the brush roller pressure can be adjusted according to the strip thickness. The cold water rinsing box 25 is equipped with a cold water rinsing spray pipe, nozzles, and a squeezing roller.

[0030] The pickling device 3 includes a pickling tank 31, a collection tray 32, a lift pump 33, a rubber-coated roller 34, a circulating filter pump 35, and a post-pickling spray chamber 36. The pickling tank 31 has a double-layer structure. During operation, the lift pump 33 raises the lower layer of acid solution to the second layer of the pickling tank 31 for pickling. The pickling process uses a through-type immersion pickling method. When only degreasing and passivation are required, the acid solution remains in the first layer of the pickling tank and does not contact the strip material, adapting to different cleaning process requirements. The collection tray 32 is used to collect leaked acid solution to prevent corrosion. The circulating filter pump 35 is equipped with a filtration system to filter the acid solution and remove impurities. The post-pickling spray chamber 36 consists of spray pipes, nozzles, and a squeeze roller, which can clean the residual acid solution on the surface of the pickled strip to prevent it from entering the next stage.

[0031] Reference Figure 2 and Figure 4 The fine brushing device 4 includes a primary brush box 41, a secondary brush box 42, and a tertiary brush box 43 arranged sequentially (see reference). Figure 4 Each brush box is equipped with two brush rollers 411, two rubber-coated reverse pressure rollers 412, a spray pipe, and nozzles 413. The brush rollers 411 can be non-woven fabric brushes or abrasive brushes. The brush rollers 411 and reverse pressure rollers 412 are driven by a variable frequency motor, and their speed can be adjusted according to the strip specifications. The pressure applied by the brush rollers 411 is controlled by a stepper motor, enabling constant pressure brushing of the strip surface. The nozzles 413 rinse the brushed strip surface and the brush roller surface, improving the brushing effect.

[0032] The passivation device 5 includes a second squeeze roller 51, a hot water spray box 52, a passivation box 53, a hot water rinsing box 54, and a 3M squeeze roller 55 arranged sequentially. The hot water spray box 52 and the hot water rinsing box 54 have the same structure, both equipped with spray pipes and nozzles. The hot water rinsing box 54 is used to rinse away the passivating agent adhering to the strip surface after passivation. The passivation box 53 uses a passivating agent with BTA as its main component to passivate the strip surface, preventing oxidation and increasing the strip's storage time. The 3M squeeze roller 55 is used to squeeze out the water from the passivated strip surface, reducing the amount of medium entering the next stage.

[0033] The drying device 6 includes a drying chamber 61 and a cooling chamber 62. The drying chamber 61 is used to dry the passivated strip, and the cooling chamber 62 is used to reduce the surface temperature of the dried strip and protect the rear roller surface.

[0034] Reference Figure 1 and Figure 3 The winding device 7 includes a rear S-roll group 71, a second hydraulic shear 72, an EPC centering device 73, a winding machine 74, and an unloading trolley 75 arranged sequentially. The rear S-roll group 71 is used for segmented control of the tension of the entire roll, enabling stepless tension adjustment. The EPC centering device 73 consists of an EPC lens and a light source, which can achieve edge centering of the strip by fine-tuning the base of the winding machine 74, thus avoiding misalignment during winding.

[0035] The second floor is equipped with an acid and alkali mist extraction device 8, which is connected to the degreasing device 2, the pickling device 3 and the passivation device 5 respectively. It can draw air, acid mist, alkali mist and other waste gases into the collector, thereby condensing the liquid acid and alkali liquid in the waste gas, which can purify the waste gas and reduce environmental pollution.

[0036] The cleaning method using the above-mentioned cleaning line has the following specific steps:

[0037] 1. Uncoiling and threading: The copper strip coil is lifted to the storage platform by a crane, and the feeding trolley 11 sends the coil to the expansion and contraction type uncoiling machine 12; the composite rubber pressure roller on the uncoiling machine 12 guides the head of the strip, and the head of the strip is introduced into the strip sewing machine 15 by the first deflection roller 13. The sewing machine 15 is hydraulically operated to overlap the tail end of the first roll of strip (or lead strip) with the head of the second roll of strip for sewing. The sewing structure adopts a pull-button type.

[0038] 2. Degreasing: After sewing, the strip first enters the pre-degreasing spray box 23 for pre-degreasing. Then, the strip enters the degreasing brush box 24 for further degreasing to remove residual emulsions or greases from the surface. After degreasing, it enters the cold water rinsing box 25 to rinse the surface of the strip and remove the degreasing agent, preventing it from entering the next process. Alkaline solution has good saponification properties. By adding a series of surfactants, it can react with saturated fatty acids to form sodium fatty acid (soap) and glycerin. Simultaneously, sodium saturated fatty acid is also a good cleaning surfactant, effectively removing organic lubricants. The degreasing agent is generally added at a rate of 0.3–2%, and the solution temperature is between 70–80 °C.

[0039] 3. Pickling: After degreasing, the strip is washed in the cold water rinsing tank 25 and then sent to the pickling device 3. The pickling tank 31 is divided into two layers, the lower layer stores acid and the upper layer is used for pickling. The acid in the upper layer is continuously pumped in by the lift pump 33. In the continuous circulation and agitation, the surface of the strip is rinsed. After pickling, the strip enters the pickling spray chamber 36 to rinse off the residual acid on the surface.

[0040] 4. Fine Brushing and Grinding: After pickling, the strip undergoes fine brushing using device 4. The brush box adopts a cantilever brushing machine with a separate drive frame design to reduce vibration. The frame is reinforced and can be equipped with different mesh grinding brushes according to the different surface quality requirements of the strip to grind and polish the surface of the strip, making the copper strip surface bright and maintaining a consistent color. The first-stage brush box 41 uses a 600-mesh abrasive brush, the second-stage brush box uses a 1500-mesh non-woven polishing brush, and the third-stage brush box 43 uses a 3000-mesh non-woven polishing roller.

[0041] 5. Passivation: The ground and polished strip is rinsed with hot water. It then undergoes passivation treatment. The passivation solution circulation system is equipped with a cartridge filter. After passivation treatment with a 0.2-0.5% benzotriazole aqueous solution at 70-85℃, the strip is rinsed again with hot water. The surface water is squeezed off by squeeze rollers and dried by air knife before entering the drying device 6. The drying device 6 is equipped with a sound insulation layer to control noise below 85 decibels.

[0042] 6. Drying and Rewinding: The drying device 6 uses electric heating and recirculates hot air, which is evenly blown onto the strip surface through a distribution box. After drying, the strip is fully cooled in the cooling box 62 and then enters the rear S-roll group 71 to adjust the strip tension. The strip is then fed into the second hydraulic shear 72 to cut off the seam end. The seam end is guided into the waste bin by a hydraulic guide plate. The strip then enters the winding machine 74, which is mounted on a movable guide rail and is hydraulically driven with photoelectric servo edge control to ensure the edge control accuracy after the strip is wound into a coil. After the required coil weight is achieved, the unloading trolley 75 and the unloading device unload the coil onto the storage platform, where it is lifted away by a crane.

[0043] The entire production line has infinitely adjustable speed, with a maximum operating speed of 100m / min and a crawling speed of 10m / min. The unit operates under PLC program control, with tension divided into three sections: unwinding, intermediate, and winding. The tension can be set according to different products, specifications, and process requirements. Temperature and liquid level in each tank are automatically controlled. Various sensors monitor, display, and trigger alarms for position, pressure, and temperature.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cleaning line for the production of thin strips of copper and copper alloys, characterized in that, The equipment includes an unwinding device and a rewinding device on the first floor, and a degreasing device, an acid washing device, a fine brushing device, a passivation device and a drying device on the second floor. The copper strip roll is cleaned by unwinding, threading, degreasing, acid washing, fine brushing and grinding, passivation and rewinding in sequence.

2. The cleaning line of claim 1, wherein The uncoiling device includes a feeding trolley, an uncoiling machine, a first deflection roller, a first hydraulic shear, a sewing machine, and a front S-roll group. The hydraulic shear is used to cut the ends of the strip, the sewing machine adopts a pull-button sewing structure, and the front S-roll group is used to adjust the tension of the copper strip coil.

3. The cleaning line of claim 1, wherein, The degreasing device includes a second deflecting roller, a first squeezing roller, a pre-spray degreasing box, a degreasing brush box, and a cold water rinsing box. The first squeezing roller is used to squeeze the strip dry and drive the strip to move. The pre-spray degreasing box and the degreasing brush box are used to degrease the strip. The cold water rinsing box is used to rinse the degreasing agent off the surface of the strip.

4. The cleaning line of claim 1, wherein, The pickling device includes a pickling tank and a spray chamber. The pickling tank is equipped with a lift pump and a circulating filter pump. The pickling tank has a two-layer structure. The first layer is filled with acid solution. The lift pump is used to lift the acid solution to the second layer of pickling strip. The circulating filter pump is used to drive the acid solution to circulate and filter.

5. The cleaning line of claim 1, wherein, The fine brushing device includes a primary brush box, a secondary brush box, and a tertiary brush box arranged in sequence, and is used for strip polishing.

6. The cleaning line of claim 1, wherein, The passivation device includes a second squeeze roller, a hot water spray box, a passivation box, a hot water rinsing box, and a 3M squeeze roller arranged in sequence. The passivation box passivates the surface of the strip with a passivating agent. The hot water rinsing box and the hot water spray box are both used to rinse the strip.

7. The cleaning line of claim 1, wherein The winding device includes a rear S-roll group, a second hydraulic shear, an EPC centering device, a winding machine, and an unloading trolley arranged in sequence. The rear S-roll group is used to control the tension of the strip, and the EPC centering device is used to fine-tune the base of the winding machine to center the edges of the strip.

8. The cleaning line as described in claim 1, characterized in that, It also includes an acid and alkali mist extraction device, which is connected to a degreasing device, an acid washing device and a passivation device, respectively, for extracting and processing alkali mist and acid mist.

9. The cleaning line of claim 5, wherein, The brush box contains brush rollers and reverse pressure rollers arranged opposite each other. The brush rollers are made of non-woven fabric or abrasive. The brush box is equipped with nozzles for rinsing the strip and the surface of the brush rollers.

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