Cleaning line and cleaning method for copper and copper alloy thin strip production

Abstract

The invention 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 the first layer, and a degreasing device, a pickling device, a fine brushing device, a passivation device and a drying device which are sequentially arranged on the 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. The invention further discloses a cleaning method based on the cleaning line. The cleaning method comprises the steps of uncoiling and threading, degreasing, pickling, fine brushing, passivating, drying and coiling. According to the invention, degreasing, cleaning and passivation in strip production are integrated, and residual oil on the surface of the strip after annealing can be effectively cleaned.

Description

Technical Field

[0001] The present invention belongs to the technical field of copper and copper alloy processing, and particularly relates to a cleaning line and a cleaning method for the production of copper and copper alloy thin strips. Background Art

[0002] For the processing technology of copper and copper alloy thin strips, the cleaning line equipment plays a crucial role in improving the surface quality of products. The existing production processes are generally divided into two types: 1. Horizontal continuous casting (continuous extrusion) → milling → rough rolling and blooming → longitudinal shearing and edge trimming of medium-thick strips → annealing → finish rolling → annealing → cleaning → finished product slitting → packaging. 2. Semi-continuous casting → hot rolling and blooming → milling → rough rolling and blooming → longitudinal shearing and edge trimming of medium-thick strips → annealing → finish rolling → annealing → cleaning → finished product slitting → packaging.

[0003] Since the lubricating and cooling medium used in the rolling process is emulsion or rolling oil, ash will be generated during the annealing process or residual oil will exist on the surface of the coil, resulting in poor surface quality or even oxidation. Secondly, due to the long-term storage of the workpieces or the leakage of protective gas during the annealing process, the surface of the strip will turn black due to oxidation, directly affecting the surface quality of the product and the use effect of the customer. This affects the product quality. The cleaning line equipment is an essential link in the production of copper alloy thin strips and plays a crucial role in removing surface residual oil, scale and ash generated during annealing.

[0004] The existing copper strip cleaning production lines, such as those disclosed in CN204174285U and CN220364592U, provide a solution for the production of medium-thick strip products. It mainly includes uncoiling → dry brushing → pickling → water tank → water brushing → passivation → squeezing → drying → reeling, etc., but there are still deficiencies for the production of thin strips. The finish rolling process uses full oil lubrication rolling, and inevitably there will be residual oil on the surface of the strip after annealing. Based on this, we propose a cleaning line and a cleaning method for the production of copper and copper alloy thin strips. Summary of the Invention

[0005] An object of the present invention is to provide a cleaning line for the production of copper and copper alloy thin strips, including an uncoiling device and a reeling device arranged on the first floor, a degreasing device, a pickling device, a fine brushing device, a passivation device and a drying device arranged in sequence on the second floor. The copper strip coil is cleaned through uncoiling and threading, degreasing, pickling, fine brushing and grinding, passivation and reeling in sequence.

[0006] Furthermore, the uncoiling device includes a loading trolley, an uncoiler, a first deflector roll, a first hydraulic shear, a sewing machine and a front S-roll group. The hydraulic shear is used for cutting the head of the strip, the sewing machine adopts a snap-fastening sewing structure, and the front S-roll group is used for adjusting the tension of the copper strip coil.

[0007] Further, the degreasing device includes a second deflection roller, a first squeezing roller, a pre-spray degreasing tank, a degreasing brush box, and a cold water rinsing box. The first squeezing roller is used to squeeze dry the strip and drive the strip to move at the same time. The pre-spray degreasing tank and the degreasing brush box are used for degreasing the strip, and the cold water rinsing box is used to rinse the degreasing agent on the surface of the strip.

[0008] Further, the pickling device includes a pickling tank body and a spray chamber. The pickling tank body is provided with a lifting pump and a circulating filtration pump. The pickling tank body adopts a two-layer structure, with acid liquid loaded in one layer. The lifting pump is used to lift the acid liquid to the second layer to pickle the strip, and the circulating filtration pump is used to drive the acid liquid to circulate and filter.

[0009] Pickling is carried out by passing-through immersion pickling; when only degreasing and passivation are required, the acid liquid is in the lower layer of the acid tank and does not contact the strip to meet the requirements of different cleaning processes.

[0010] Further, the fine brushing device includes a first-stage brush box, a second-stage brush box, and a third-stage brush box arranged in sequence. The fine brushing device is used for polishing the strip.

[0011] The fine brushing device is provided with three-stage brush boxes, and different brush rollers can be selected according to different product requirements to polish and grind the surface of the strip targeted, improving the surface quality of the product.

[0012] Further, the passivation device includes a second squeezing roller, a hot water spray box, a passivation box, a hot water rinsing box, and a 3M squeezing roller arranged in sequence. The passivation box passivates the surface of the strip with a passivation agent, and both the hot water rinsing box and the hot water spray box are used to rinse the strip.

[0013] Further, the winding device includes a rear S-roller group, a second hydraulic shear, an EPC centering device, a winder, and a discharging trolley arranged in sequence. The rear S-roller group is used to control the tension of the strip, and the EPC centering device is used to finely adjust the base of the winder to center the edge of the strip.

[0014] Further, an acid and alkali mist suction device is also included. The acid and alkali mist suction device is respectively connected to the degreasing device, the pickling device, and the passivation device, and is used to extract and treat alkali mist and acid mist.

[0015] Further, the brush box is provided with a brush roller and a reverse pressure roller arranged oppositely up and down. The brush roller is selected from a non-woven fabric brush or an abrasive brush, and the brush box is provided with a nozzle for rinsing the surface of the strip and the brush roller.

[0016] Another object of the present invention is to provide a cleaning method for the production of copper and copper alloy thin strips. Using the above cleaning line, it includes the following steps: (1) Uncoiling and threading the strip. The uncoiler uncoils the copper strip coil, and the sewing machine stitches the ends of adjacent strips. The sewing structure is a snap-fastener type; (2) Degreasing: Use the pre-degreasing spray tank and degreasing brush tank for secondary degreasing. After degreasing, rinse and squeeze dry; the addition amount of the degreasing agent is 0.3 - 2%, and the solution temperature is 70 - 80 °C; (3) Pickling: Use the pickling tank body to soak and pickle the strip by passing through. After pickling, rinse and squeeze dry; (4) Fine brushing: Use the fine brush box to grind and polish the surface of the strip; the first-level brush box 41 uses a 600-mesh abrasive brush, the second-level brush box uses a 1500-non-woven polishing brush, and the third-level brush box 43 uses a 3000-non-woven polishing roller; (5) Passivation: The strip is passivated with a 0.2 - 0.5% aqueous solution of benzotriazole at 70 - 85 °C; (6) Drying and winding: Dry and cool the strip, cut off the stitching head of the strip, and wind it with a winder.

[0017] The present invention has the following beneficial effects: 1. A cleaning line for the production of copper and copper alloy thin strips proposed by the present invention integrates degreasing, cleaning, and passivation in strip production, can effectively clean the residual oil on the surface of the strip after annealing, and can select the cleaning method according to different requirements; the pickling device is divided into upper and lower layers, the lower layer stores the liquid, and when working, the lifting pump lifts the acid liquid in the lower layer to the second layer of the pickling tank for pickling. The pickling adopts 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 contact the strip to meet the requirements of different cleaning processes; most of the oil stains and oxide layers can be removed after the strip passes through degreasing and pickling; the fine brushing device is provided with three-level brush boxes, and different brush rollers can be selected according to different product requirements to polish and grind the surface of the strip targeted, improving the surface quality of the product; the equipment adopts a double-layer design, which can reduce the floor area and save production costs.

[0018] 2. By setting multiple groups of squeezing rollers at the degreasing device, pickling device, and passivation device, the medium in the previous link can be squeezed dry, avoiding the medium from entering the next link along with the strip, reducing the risk of medium pollution, reducing the frequency of medium replacement, increasing the service life of the medium, and reducing production costs. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the cleaning line for the production of copper and copper alloy thin strips in the present invention.

[0020] Figure 2 It is a schematic diagram of the top view structure of the second layer in the present invention.

[0021] Figure 3 It is a schematic diagram of the top view structure of the first layer in the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the brush box in the present invention.

[0023] In the figure: 1. Uncoiler; 11. Loading trolley; 12. Uncoiler; 13. First deflector roll; 14. First hydraulic shear; 15. Sewing machine; 16. Front S-roll group; 2. Degreasing device; 21. Second deflector roll; 22. First squeezing roll; 23. Pre-spray degreasing tank; 24. Degreasing brush box; 25. Cold water rinsing tank; 3. Pickling device; 31. Pickling tank body; 32. Liquid collecting tray; 33. Lift pump; 34. Rubber-coated roll; 35. Circulating filtration pump; 36. Post-pickling spray chamber; 4. Fine brushing device; 41. First-stage brush box; 411. Brushing roll; 412. Reverse pressure roll; 413. Nozzle; 42. Second-stage brush box; 43. Third-stage brush box; 5. Passivation device; 51. Second squeezing roll; 52. Hot water spray box; 53. Passivation tank; 54. Hot water rinsing tank; 55. 3M squeezing roll; 6. Drying device; 61. Drying box; 62. Cooling box; 7. Rewinder; 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 manners

[0024] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention 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 only used to explain the present invention and are not used to limit the present invention.

[0025] The present invention discloses a cleaning line for the production of copper and copper alloy thin strips, including an uncoiler 1, a degreasing device 2, a pickling device 3, a fine brushing device 4, a passivation device 5, a drying device 6, and a rewinder 7 arranged in sequence along the cleaning and transmission direction of the strip. The cleaning line adopts a double-layer structure, with the uncoiler 1 and the rewinder 7 arranged on one layer, and the degreasing device 2, the pickling device 3, the fine brushing device 4, the passivation device 5, and the drying device 6 arranged on the second layer.

[0026] Referring to Figure 1 , the uncoiler 1 includes a loading trolley 11, an uncoiler 12, a first deflector roll 13, a first hydraulic shear 14, a sewing machine 15, and a front S-roll group 16. The loading trolley 11 is provided with a storage table, and the uncoiler 12 is provided with a pressure head roll for preventing the coil from loosening during uncoiling; the first deflector roll 13 is used to assist in changing the strip direction; the first hydraulic shear 14 is used to cut the head of the strip for easy sewing; the sewing machine 15 adopts a snap-button sewing structure, equipped with upper and lower dies, 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-coated roll, reducing damage to the machine train roll group; the front S-roll group 16 is composed of 2 S-rolls and 1 deflector roll, and is used to adjust the tension in the uncoiling and degreasing section to ensure the degreasing effect of the strip.

[0027] Referring to Figure 2The degreasing device 2 includes a second deflection roller 21, a first squeeze roller 22, a pre-spray degreasing box 23, a degreasing brush box 24, and a cold water flushing box 25. The second deflection roller 21 is used to adjust the direction of the strip; the squeeze roller 22 can prevent the degreasing agent solution from overflowing to the outside of the pre-spray degreasing box 23 and provide power for the strip movement; the pre-spray degreasing box 23 is mainly used to pre-treat the grease on the surface of the strip; the degreasing brush box 24 is equipped with a cleaning brush roller, a reverse pressure roller, a spray pipe and a nozzle, wherein the brush hair material of the cleaning brush roller is PA612 with a diameter of 0.4mm, the reverse pressure roller is coated with alkali-resistant rubber, and an ammeter is equipped to display the brush roller current in real time, and the brush roller pressure can be adjusted according to the thickness of the strip. The cold water flushing box 25 is equipped with a cold water flushing spray pipe, a nozzle, and a squeeze roller.

[0028] The pickling device 3 includes a pickling tank 31, a liquid accumulation tray 32, a lifting pump 33, a rubber-coated roller 34, a circulating filter pump 35 and a post-pickling spray chamber 36. The pickling tank 31 is provided with an upper and lower double-layer structure. When working, the lifting pump 33 lifts the lower layer of acid liquid to the second layer of the pickling tank 31 for pickling. The pickling adopts through-type immersion pickling; when only degreasing and passivation are required, the acid liquid is in the first layer of the pickling tank and does not contact the strip to meet the requirements of different cleaning processes. The liquid accumulation tray 32 is used to receive the leaked acid liquid to avoid corrosion. The circulating filter pump 35 is equipped with a filtering system for filtering the acid liquid and removing impurities in the acid liquid. The post-pickling spray chamber 36 is composed of a spray pipe, a nozzle and a squeeze roller, which can clean the residual acid solution on the surface of the strip after pickling to prevent it from entering the next link.

[0029] 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 in sequence (refer to Figure 4 ) Each brush box is equipped with two brush rollers 411, two reverse pressure rollers 412 with rubber coating, spray pipes and nozzles 413. The brush rollers 411 can be non-woven brushes or abrasive brushes. The brush rollers 411 and reverse pressure rollers 412 are driven by variable frequency motors, and the speed can be adjusted according to the specifications of the strip. The pressing amount of the brush rollers 411 is controlled by a stepper motor, which can achieve constant pressure to brush the surface of the strip. The nozzles 413 can rinse the surface of the strip and the brush roller after brushing to improve the brushing effect.

[0030] The passivation device 5 includes a second squeezing roller 51, a hot water spray box 52, a passivation box 53, a hot water rinse box 54, and a 3M squeezing roller 55 arranged in sequence. The hot water spray box 52 and the hot water rinse box 54 have the same structure, both being provided with spray pipes and nozzles. Among them, the hot water rinse box 54 is used to rinse the passivation agent attached to the surface of the strip after passivation. The passivation box 53 uses a passivation agent mainly composed of BTA to perform passivation treatment on the surface of the strip to prevent oxidation and increase the storage time of the strip. The 3M squeezing roller 55 is used to squeeze the water on the surface of the passivated strip to reduce the medium from entering the next process.

[0031] The drying device 6 includes a drying box 61 and a cooling box 62. The drying box 61 is used to dry the passivated strip, and the cooling box 62 is used to reduce the surface temperature of the dried strip, playing a role in protecting the rear roller surface.

[0032] Refer to Figure 1 and Figure 3 As shown in, the coiling device 7 includes a rear S-roller group 71, a second hydraulic shear 72, an EPC centering device 73, a coiling machine 74, and a discharging trolley 75 arranged in sequence. The rear S-roller group 71 is used for segmented control of the tension of the whole machine train and can achieve stepless adjustment of the tension. The EPC centering device 73 consists of an EPC lens and a light source. By fine-tuning the base of the coiling machine 74, the edge centering of the strip can be completed to avoid the phenomenon of misalignment during coiling.

[0033] An acid-base mist suction device 8 is provided on the second floor. The acid-base mist suction device is respectively connected to the degreasing device 2, the pickling device 3, and the passivation device 5. It can suck waste gases such as air, acid mist, and alkali mist into the collector, so as to condense the liquid acid-base liquid in the waste gas, play a role in purifying the waste gas, and reduce environmental pollution.

[0034] The present invention discloses a cleaning method for the production of copper and copper alloy thin strips, which specifically includes the following steps: (1) Uncoiling and threading the strip. The copper strip coil is lifted by a crane to the storage table, and the loading trolley 11 sends the coil to the expanding and contracting uncoiler 12. The pressure head roller with composite rubber on the uncoiler 12 guides the head of the strip, and the head of the strip is introduced into the strip stitching machine 15 by the first deflection roller 13. The stitching machine 15 is operated hydraulically, and the tail end of the first coil of strip (or lead strip) is overlapped with the head of the second coil of strip for stitching. The stitching structure adopts a snap-fastener type; (2) Degreasing: After stitching, the strip first enters the pre-degreasing spray tank 23 for pre-degreasing, and then enters the degreasing brush box 24 for further degreasing to remove dirt such as emulsion or grease remaining on the strip surface. After degreasing, it enters the cold water rinsing tank 25 to rinse the degreasing agent on the strip surface to prevent the degreasing agent from entering the next process. The lye has good saponification effect. By adding a series of surfactants, it can form sodium fatty acid (soap) and glycerol with saturated fatty acids. At the same time, sodium saturated fatty acid is also a good cleaning surfactant with good effect of removing organic lubricants. The general dosage of the degreasing agent is 0.3 - 2%, and the solution temperature is between 70 - 80 °C.

[0035] (3) Pickling: After the strip is degreased and washed in the cold water rinsing tank 25, it is sent to the pickling device 3. The pickling tank body 31 is divided into upper and lower layers. The lower layer stores acid, using concentrated sulfuric acid, and the upper layer is for pickling. The acid in the upper layer is continuously pumped in by the lift pump 33. During continuous circulation and agitation, the strip surface is rinsed. After pickling, the strip enters the post-pickling spray chamber 36 to rinse off the residual acid on the surface.

[0036] (4) Fine brushing and grinding: After pickling, the strip enters the fine brushing device 4. The brush box uses a cantilever type brushing machine with a drive frame separation design to reduce vibration and the frame is strengthened. Different mesh number grinding brushes can be equipped according to different surface quality requirements of the strip to grind and polish the strip surface, making the copper strip surface bright and maintaining consistent color. The first-level brush box 41 uses 600-mesh abrasive brushes, the second-level brush box uses 1500-mesh non-woven polishing brushes, and the third-level brush box 43 uses 3000-mesh non-woven polishing rollers.

[0037] (5) Passivation: After grinding and polishing, the strip is rinsed with hot water. Subsequently, passivation treatment is carried out. The circulation system of the passivation solution is equipped with a barrel filter. After the strip is passivated with a 0.2 - 0.5% aqueous solution of benzotriazole at 70 - 85 °C, it is rinsed with hot water again. After being squeezed by the squeeze roller to remove the surface moisture and dried by the air knife, it enters the drying device 6.

[0038] (6) Drying and winding: The drying device 6 is provided with a sound insulation layer to control the noise below 85 decibels. The drying device 6 uses electric heating and recycles hot air. The hot air is evenly blown on the strip surface through the distribution box. After drying, the strip is fully cooled in the cooling box 62 and then enters the rear S-roller group 71 to adjust the strip tension. The strip is sent to the second hydraulic shear 72 to cut off the stitching head of the strip. The stitching head is introduced into the waste box by the hydraulic guide plate. The strip enters the coiler 74. The coiler 74 is installed on a movable guide rail and is hydraulically driven, implementing photoelectric servo edge control to ensure the edge control accuracy after the strip is wound into a coil. After the coiled strip reaches the required coil weight, the strip coil is unloaded onto the storage table by the unloading trolley 75 and the unloading device and then lifted away by a crane.

[0039] The speed of the whole production line is steplessly adjustable, with a maximum operating speed of 100 m / min and a creeping speed of 10 m / min. The operation of the unit is controlled by a PLC program. The tension is divided into three sections: the unwinding section, the middle section and the coiling section. The magnitude of the tension can be set according to different varieties, specifications and process requirements. The temperature and liquid level of each tank group are automatically controlled. Various sensors monitor, display and alarm the position, pressure, temperature, etc.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cleaning line for the production of copper and copper alloy thin strips, characterized in that, It includes an uncoiler and a recoiler installed on the first floor, and a degreasing device, a pickling device, a fine brushing device, a passivation device and a drying device installed in sequence on the second floor. The copper strip coil is sequentially uncoiled, threaded, degreased, pickled, finely brushed and ground, passivated and recoiled to complete the cleaning.

2. The cleaning line according to claim 1, characterized in that, The uncoiler includes a loading trolley, an uncoiler, a first deflector roll, a first hydraulic shear, a sewing machine and a front S-roll group. The hydraulic shear is used to cut the head of the strip. The sewing machine adopts a snap-fastening sewing structure. The front S-roll group is used to adjust the tension of the copper strip coil.

3. The cleaning line according to claim 1, characterized in that, The degreasing device includes a second deflector roll, a first squeezing roll, a pre-spray degreasing tank, a degreasing brush box and a cold water rinsing box. The first squeezing roll is used to squeeze dry the strip and drive the strip to move at the same time. The pre-spray degreasing tank and the degreasing brush box are used for degreasing the strip. The cold water rinsing box is used to rinse the degreasing agent on the surface of the strip.

4. The cleaning line according to claim 1, wherein, The pickling device includes a pickling tank body and a spraying chamber. The pickling tank body is provided with a lifting pump and a circulating filtration pump. The pickling tank body adopts a two-layer structure. The first layer is filled with acid solution. The lifting pump is used to lift the acid solution to the second layer to pickle the strip. The circulating filtration pump is used to drive the acid solution to circulate and filter.

5. The cleaning line according to claim 1, wherein, The fine brushing device includes a first-stage brush box, a second-stage brush box and a third-stage brush box arranged in sequence. The fine brushing device is used for polishing the strip.

6. The cleaning line according to claim 1, wherein, The passivation device includes a second squeezing roll, a hot water spraying box, a passivation box, a hot water rinsing box and a 3M squeezing roll arranged in sequence. The passivation box passivates the surface of the strip with a passivating agent. Both the hot water rinsing box and the hot water spraying box are used for rinsing the strip.

7. The cleaning line according to claim 1, characterized in that, The recoiler includes a rear S-roll group, a second hydraulic shear, an EPC centering device, a recoiler and a discharging trolley arranged in sequence. The rear S-roll group is used to control the tension of the strip. The EPC centering device is used for fine-tuning the base of the recoiler to center the edge of the strip.

8. The cleaning line according to claim 1, characterized in that, It also includes an acid and alkali mist suction device, which is respectively connected to the degreasing device, the pickling device and the passivation device to extract and process alkali mist and acid mist.

9. The cleaning line according to claim 5, characterized in that, The brush box is provided with a brush roll and a reverse pressure roll arranged opposite to each other up and down. The brush roll is selected from a non-woven brush or an abrasive brush. The brush box is provided with a nozzle for rinsing the strip and the surface of the brush roll.

10. A cleaning method for the production of copper and copper alloy thin strips, using the cleaning line according to any one of claims 1-9, characterized in that, It includes the following steps: (1) Uncoiling and threading: The uncoiler uncoils the copper strip coil, and the sewing machine stitches the ends of adjacent strips. The sewing structure is a snap-fastening type; (2) Degreasing: Use the pre-degreasing spray box and the degreasing brush box for secondary degreasing. After degreasing, rinse and squeeze dry. The addition amount of the degreasing agent is 0.3-2%, and the solution temperature is 70-80 °C; (3) Pickling: Use the pickling tank body to pickle the strip by through-type immersion. After pickling, rinse and squeeze dry; (4) Fine brushing: Use the fine brush box to grind and polish the surface of the strip. 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 roll; (5) Passivation: The strip is passivated with a 0.2-0.5% aqueous solution of benzotriazole at 70-85 °C; (6) Drying and recoiling: Dry and cool the strip, cut off the sewing head of the strip, and use the recoiler to recoil.

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