Preparation method of thermal bimetal belt

Abstract

The invention discloses a preparation method of a thermal bimetal strip, which specifically comprises the following steps: step 1, a copper strip or an aluminum bar sequentially penetrates through a sliding sleeve and a sleeve on a base, and then a liquid pump pumps a pickling solution and pure water in a liquid tank into an inner cavity through a liquid conveying pipe; the water flows into the sliding sleeve through the overflow hole to be in contact with the surface of the copper strip or the aluminum bar, so that the oxidation film on the surface of the copper strip or the aluminum bar is removed and rinsed; secondly, the cleaned copper strip or aluminum bar enters a sleeve, and through movement of an arc block and a sliding block, the technical field of metal composite materials is achieved, and the problem that when an existing copper-aluminum bimetal composite material is prepared, due to the fact that dense oxidation films exist on the surfaces of pure copper and aluminum materials, the pure copper and the aluminum materials are subjected to continuous equal-channel angular extrusion after coating is solved; and due to large differences of plasticity, hardness and deformation behaviors, cracking or stripping is easily generated at an interface, so that the forming quality and the mechanical property of the composite material are influenced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal composite materials, in particular to a preparation method of hot bimetallic strip. BACKGROUND

[0002] The copper-aluminum bimetallic composite material is formed by tightly combining copper and aluminum under high pressure through a specific process, and has the advantages of both materials. However, the existing process can cause the conductivity and mechanical properties of the composite material to deteriorate. In the invention patent with the publication number CN119702751A, a copper-aluminum bimetallic composite material and its preparation method are disclosed. The copper strip is wrapped around the aluminum material, and the continuous electron beam welding is used to seal the opening. The use of aluminum instead of part of the copper reduces the overall weight of the material while maintaining the high conductivity of pure copper, saving copper resources and reducing production costs.

[0003] Although the device solves the shortcomings of the existing process, in actual production, due to the dense oxide film on the surface of the copper strip and the aluminum profile, when continuous equal-channel angular extrusion is performed, due to the large difference in plasticity, hardness, and deformation behavior between the two metals, cracking or peeling can easily occur at the interface, thereby affecting the forming quality and mechanical properties of the composite material. Therefore, it is necessary to solve the problems existing in the existing copper-aluminum bimetallic composite material. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a preparation method of hot bimetallic strip, which solves the problem that the existing copper-aluminum bimetallic composite material is prepared, and due to the dense oxide film on the surface of pure copper and aluminum, when the two are wrapped and then subjected to continuous equal-channel angular extrusion, due to the large difference in plasticity, hardness, and deformation behavior, cracking or peeling can easily occur at the interface, thereby affecting the forming quality and mechanical properties of the composite material.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme: a preparation method of hot bimetallic strip, specifically comprising the following steps: Step one, the copper strip or aluminum rod is inserted into the sleeve and the sleeve in sequence, then the liquid pump pumps the pickling liquid and pure water in the liquid tank into the inner cavity through the liquid inlet pipe, and then flows into the inside of the sleeve through the overflow hole to contact the surface of the copper strip or aluminum rod, so as to remove the oxide film on the surface of the copper strip or aluminum rod and rinse it; Step two, the cleaned copper strip or aluminum rod enters the sleeve, the cloth belt is wrapped around the surface of the copper strip or aluminum rod through the movement of the arc block and the sliding block, and then the cloth belt absorbs the pure water on the surface of the copper strip or aluminum rod through the forward and reverse rotation of the drum driven by the two drive motors; Step three, when the tape is repeatedly wound by the winding drum, dehydration is carried out through extrusion of the extrusion roller, and meanwhile, in the water absorption process, the output end of the adjusting rod is extended and retracted to drive the tension roller to move up and down, so as to adjust the tightness of the tape wrapping and adjust the absorption effect; Step four, after the treated copper strip is wrapped outside the aluminum rod, welding and continuous equal-channel angular extrusion are carried out, and then a copper-aluminum bimetallic material is obtained. Step five, after the copper-aluminum bimetallic material is heat treated, copper-aluminum bimetallic profiled material or copper-aluminum bimetallic rod material is obtained through expansion extrusion or drawing.

[0006] Preferably, the top of the base is provided with an acid pickling mechanism, the acid pickling mechanism comprises two liquid tanks, the outer surfaces of the two liquid tanks are fixedly connected with the outer surface of the base, the upper portions of the two liquid tanks are provided with sliding sleeves, the bodies of the two sliding sleeves are provided with inner cavities, the interiors of the two inner cavities are communicated with overflow holes, the overflow holes are arranged in the interiors of the sliding sleeves, the interiors of the inner cavities and the interiors of the liquid tanks are communicated through the interiors of liquid delivery pipes, the outer surfaces of the liquid delivery pipes are sleeved with liquid tanks, the outer surfaces of the liquid tanks are fixedly connected with the outer surfaces of the liquid tanks, the interiors of the liquid tanks are fixedly connected with partition plates, and the bodies of the partition plates are fixedly connected with the outer surfaces of the liquid delivery pipes.

[0007] Preferably, a steaming tank is arranged between the outer surfaces of the two liquid tanks, two one-way valves are penetratingly communicated in the interior of the steaming tank, one ends of the two one-way valves are respectively penetratingly communicated with the interiors of the two liquid tanks, a heating strip is embeddedly and fixedly connected to the lower portion in the interior of the steaming tank, and two connecting pipes are penetratingly communicated with the interiors of the two liquid tanks.

[0008] Preferably, the outer portion of one of the liquid tanks is provided with a drying assembly, the drying assembly comprises a sleeve, the outer surface of the sleeve is fixedly connected with the outer surface of the base through a fixed plate, a cloth belt is movably connected in the interior of the sleeve, both ends of the cloth belt are woundly connected with winding drums, shaft ends of both sides of the winding drums are rotatingly connected with supports, the outer surfaces of both sides of the supports are fixedly connected with fixed rods, one end of one of the fixed rods is fixedly connected with the interior of the sleeve, the outer surfaces of both sides of the supports are fixedly connected with driving motors, and the output ends of both sides of the driving motors are fixedly connected with one side of the shaft ends of the two winding drums through couplings.

[0009] Preferably, an annular groove is arranged in the interior of the sleeve, an annular rail is fixedly connected in the interior of the annular groove, an arc block is slidingly connected with the outer surface of the annular rail, a straight rail is fixedly connected with the outer surface of the arc block, a sliding block is slidingly connected with the outer surface of the straight rail, and the outer surface of the sliding block is fixedly connected with one end of the other fixed rod.

[0010] Preferably, the outer part of the straight rail is provided with a fixed ring, and the outer surface of the fixed ring is fixedly connected with the inner part of the sleeve.

[0011] Preferably, the outer part of the cloth belt is provided with a dehydration unit, the dehydration unit comprises a hopper, the hopper is arranged below the cloth belt, a frame is fixedly connected with the top of the hopper, the frame is sleeved outside the cloth belt, two extrusion rollers are rotationally connected with the body of the frame in a penetrating mode, and the outer surfaces of the two extrusion rollers are movably connected with the two sides of the outer surface of the cloth belt.

[0012] Preferably, through holes are formed in the two sides of the frame body, a tension roller is movably connected with the outer surface of the cloth belt, the two ends of the tension roller are movably connected with the inner parts of the two sides of the through holes, bearings are fixedly connected with the two ends of the tension roller, adjusting rods are fixedly connected with the outer surfaces of the two bearings, and the outer surfaces of the two adjusting rods are fixedly connected with the outer surface of the frame.

[0013] Preferably, arc grooves are arranged below the two hoppers, the outer surfaces of the two arc grooves are fixedly connected with the two sides of the inner part of the sleeve, a drain pipe is in communication with the inner part of the arc groove in a penetrating mode, the outer surface of the drain pipe is fixedly connected with the body of the sleeve in a penetrating mode, and one end of the drain pipe is in communication with the inner part of one of the liquid tanks in a penetrating mode.

[0014] Beneficial effects The application provides a preparation method of a thermal bimetallic belt. (1) By arranging the pickling mechanism, using diluted sulfuric acid or nitric acid solution, and sodium hydroxide solution and nitric acid solution as pickling solution, the oxide film on the surface of the copper belt and the aluminum rod is removed, and the surface of the two is rinsed with flowing pure water to remove the residual pickling solution and reaction substances, so that the two obtain a clean and active metal surface, thereby increasing the contact area and mechanical interlocking potential of the copper belt and the aluminum rod when the copper belt is wrapped on the surface of the aluminum rod.

[0015] (2) By arranging the drying assembly, the cloth belt can be wrapped on the surface of the copper belt or the aluminum rod through the movement of the arc block and the sliding block, which not only can adsorb the residual pure water on the surface after rinsing, but also can increase the adsorption area, and the two drive motors drive the winding drum to rotate repeatedly, on the one hand, the cloth belt can be adsorbed at the replacement position to prolong its service life, on the other hand, through the reciprocating movement of the cloth belt, different parts can be continuously adsorbed.

[0016] (3) By setting the dehydration unit, in the cloth tape reciprocating motion process, through the extrusion of the two sides of the extrusion roller, dehydration is carried out, so that the cloth tape can be continuously treated, and the collected pure water can be recycled by using the hopper, the arc groove and the drain pipe, so as to reduce the water consumption, and the tension roller is driven by the adjusting rod to adjust the tightness of the cloth tape, so as to adjust the adsorption and recovery effect of the pure water. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the external structure perspective view of the application; Figure 2 It is the internal structure perspective view of the liquid tank of the application; Figure 3 It is the internal structure perspective view of the steam box of the application; Figure 4 It is the external structure perspective view of the winding drum of the application; Figure 5 It is the external structure perspective view of the frame of the application; Figure 6 It is the winding diagram of the cloth tape of the application.

[0018] In the figure: 1, base; 2, liquid tank; 3, drying assembly; 31, sleeve; 32, fixed plate; 33, cloth tape; 34, dehydration unit; 341, hopper; 342, frame; 343, extrusion roller; 344, chute; 345, tension roller; 346, bearing; 347, adjusting rod; 348, arc groove; 349, drain pipe; 35, winding drum; 36, support; 37, fixed ring; 38, driving motor; 39, ring groove; 310, ring rail; 311, arc block; 312, straight rail; 313, sliding block; 4, sliding sleeve; 5, inner cavity; 6, overflow hole; 7, infusion tube; 8, liquid tank; 9, partition; 10, steam box; 11, one-way valve; 12, heating strip; 13, connecting pipe. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0020] Please refer to Figures 1-6 The application provides a technical solution: a preparation method of a thermal bimetallic strip, which specifically comprises the following steps: Step one, copper strip or aluminum rod is inserted into the sleeve 31 and the sliding sleeve 4 on the base 1 in turn, then the liquid pump pumps the pickling liquid and pure water in the liquid tank 2 into the inner cavity 5, and then flows into the sliding sleeve 4 through the overflow hole 6 to contact with the surface of the copper strip or aluminum rod, so as to remove the oxide film on the surface of the copper strip or aluminum rod and rinse it; Step two, the cleaned copper strip or aluminum rod enters the sleeve 31, and the cloth belt 33 is wrapped on the surface of the copper strip or aluminum rod by the movement of the arc block 311 and the sliding block 313, then the cloth belt 33 absorbs the pure water on the surface of the copper strip or aluminum rod by the forward and reverse rotation of the drum 35 driven by the driving motor 38 on both sides; Step three, when the cloth belt 33 is repeatedly wound by the drum 35, it is dehydrated by the extrusion of the extrusion roller 343, and at the same time, according to the amount of water stain on the surface, the output end of the adjusting rod 347 is extended and retracted through the bearing 346 to drive the tensioning roller 345 to move up and down, so as to adjust the tightness of the cloth belt 33 wrapped on the surface of the copper strip or aluminum rod, and adjust the absorption effect; Step four, after the treated copper strip is wrapped outside the aluminum rod, it is welded and continuously channel angle extruded to obtain a copper-aluminum bimetallic material; Step five, after the copper-aluminum bimetallic material is heat treated, it is expanded or drawn to obtain a copper-aluminum bimetallic bar or rod material.

[0021] The top of the base 1 is provided with pickling mechanism, the two sides of the base 1 can be provided with conveying mechanism, so as to facilitate the movement of copper strip or aluminum bar, so that continuous processing can be realized, the pickling mechanism includes two liquid tanks 2, the outer surfaces of the two liquid tanks 2 are fixedly connected with the outer surface of the base 1, the upper portions of the two liquid tanks 2 are provided with sliding sleeves 4, when the copper strip is pickled, the liquid tank 2 and the sliding sleeve 4 are provided with two groups, and along the movement direction, the two liquid tanks 2 are respectively filled with dilute sulfuric acid solution / nitric acid solution and pure water, when the aluminum bar is pickled, the liquid tank 2 and the sliding sleeve 4 are provided with three groups, and along the movement direction, the three liquid tanks 2 are respectively filled with sodium hydroxide solution, nitric acid solution and pure water, wherein the sodium hydroxide solution is used for alkali etching of aluminum oxide, the nitric acid solution is used for lightening treatment of the surface of the aluminum bar after alkali etching, so as to remove the grayish black hanging ash generated on the surface and obtain a bright and uniform surface, and the length of the sliding sleeve 4 along the movement direction is relatively long, so as to ensure the pickling and rinsing effect, and as an optional mode, the outer side of the sliding sleeve 4 can be provided with an air extraction device and a purification device, so as to uniformly purify the acid mist or alkali mist that may be generated, thereby avoiding environmental pollution and harm to personnel health, the bodies of the two sliding sleeves 4 are provided with inner cavities 5, the interiors of the two inner cavities 5 are communicated with overflow holes 6, the overflow holes 6 are arranged in the interiors of the sliding sleeves 4, the interiors of the inner cavities 5 are communicated with the interiors of the liquid tanks 2 through the interiors of liquid delivery pipes 7, the liquid tanks 2 are provided with corrosion-resistant liquid pumps in the interiors, and the output ends of the liquid pumps are communicated with one ends of the liquid delivery pipes 7, so as to pump the pickling liquid into the interiors of the sliding sleeves 4, the outer surfaces of the liquid delivery pipes 7 are sleeved with liquid tanks 8, the horizontal cross-sectional area of the top of the liquid tank 8 is greater than that of the sliding sleeve 4, so as to collect the overflowed pickling liquid and pure water, the outer surface of the liquid tank 8 is fixedly connected with the outer surface of the liquid tank 2, as another optional mode, the sliding sleeves 4 and the liquid tanks 8 for rinsing are provided with a plurality of groups along the movement direction, so that the pickling liquid and the reaction substances will not be left on the surface of the copper strip or the aluminum bar through multiple rinsing, the inner cavities of the liquid tanks 8 are fixedly connected with partitions 9, the bodies of the partitions 9 are fixedly connected with the outer surfaces of the liquid delivery pipes 7.

[0022] The outer surfaces of the two liquid tanks 2 are provided with a steaming tank 10, the inside of the steaming tank 10 is provided with two one-way valves 11 in communication, the one-way valves 11 provide a one-way flow path, so that the collected pickling liquid and pure water can flow into the inside of the steaming tank 10 in one direction, one end of the two one-way valves 11 is in communication with the inside of the two liquid tanks 8 respectively, a heating strip 12 is embedded and fixedly connected in the lower part of the inside of the steaming tank 10, the heating strip 12 is electrically connected with an external control circuit, and an anti-corrosion measure is externally provided, the concentration of the collected pickling liquid is improved by heating and evaporation, so that the effect of recycling the pickling liquid is maintained, the upper and lower sides of the inside of the steaming tank 10 are provided with a connecting pipe 13 in communication, one end of the lower connecting pipe 13 is provided with a filtering measure, which can filter and collect the impurities mixed in the collected pickling liquid, and the pickling liquid after evaporation can also flow back to the inside of the corresponding liquid tank 2, one end of the two connecting pipes 13 is in communication with the inside of the two liquid tanks 2 respectively.

[0023] The outside of one of the liquid tanks 2 is provided with a drying assembly 3, the drying assembly 3 includes a sleeve 31, the outer surface of the sleeve 31 is fixedly connected with the outer surface of the base 1 through a fixed plate 32, a cloth belt 33 is movably connected in the inside of the sleeve 31, the cloth belt 33 is made of a fiber material with good tensile resistance, corrosion resistance and adsorption, which is used to recover the pure water remaining after rinsing, and as a preferred mode, the cloth belt 33 can be crosswise arranged with a copper belt or an aluminum rod, and the cross angle is matched with the wrapping angle of the cloth belt 33, both ends of the cloth belt 33 are wound and connected with a winding drum 35, the winding drum 35 can wind and release the cloth belt 33, so that the cloth belt 33 can adsorb pure water through different parts, thereby realizing continuous treatment, the shaft ends of the two winding drums 35 are rotatably connected with brackets 36, the outer surfaces of the two brackets 36 are fixedly connected with fixed rods, one end of one of the fixed rods is fixedly connected with the inside of the sleeve 31, the outer surfaces of the two brackets 36 are fixedly connected with drive motors 38, the drive motors 38 are made of servo motors, which can drive the winding drum 35 to rotate forward and backward, the output ends of the two drive motors 38 are fixedly connected with one side shaft ends of the two winding drums 35 through shaft couplings respectively.

[0024] The inside of the sleeve 31 is provided with a ring groove 39, the inside of the ring groove 39 is fixedly connected with a ring rail 310, the outer surface of the ring rail 310 is slidably connected with an arc block 311, the outer surface of the arc block 311 is fixedly connected with a straight rail 312, the outer surface of the straight rail 312 is slidably connected with a sliding block 313, the sliding block 313 and the arc block 311 are made of linear motors, and through the movement of the two, the cloth belt 33 can be wrapped on the surface of the copper belt or the aluminum rod, so as to improve the treatment area and treatment effect, the outer surface of the sliding block 313 is fixedly connected with one end of the other fixed rod.

[0025] The outer part of the straight rail 312 is provided with a fixed ring 37, and the fixed ring 37 is provided with a rotating power supply element, so as to provide rotating power supply for the driving motor 38, the sliding block 313 and the arc block 311. The outer surface of the fixed ring 37 is fixedly connected with the inner part of the sleeve 31.

[0026] The outer part of the cloth belt 33 is provided with a dehydration unit 34, and the dehydration unit 34 comprises a hopper 341 which serves as a unified collection. The hopper 341 is arranged below the cloth belt 33, and the top of the hopper 341 is fixedly connected with a frame 342. The frame 342 is arranged outside the cloth belt 33, and the body of the frame 342 is rotatably connected with two extrusion rollers 343. The arc surfaces of the two extrusion rollers 343 have a spacing smaller than the thickness of the cloth belt 33 when it is dried, so as to realize dehydration through extrusion. The outer surfaces of the two extrusion rollers 343 are movably connected with the two sides of the outer surface of the cloth belt 33.

[0027] The body of the frame 342 is provided with a through sliding groove 344 on each side. The outer surface of the cloth belt 33 is movably connected with a tensioning roller 345 arranged below the cloth belt 33. The tensioning roller 345 can move up and down to adjust the tightness of the cloth belt 33, so as to adjust the water absorption performance of the cloth belt 33. The two ends of the tensioning roller 345 are movably connected with the inner parts of the two sliding grooves 344. The two ends of the tensioning roller 345 are fixedly connected with bearings 346. The outer surfaces of the two bearings 346 are fixedly connected with adjusting rods 347. The adjusting rods 347 are made of electric push rods and are electrically connected with the rotating power supply element. The outer surfaces of the two adjusting rods 347 are fixedly connected with the outer surface of the frame 342.

[0028] The lower part of each hopper 341 is provided with an arc groove 348. The outer surfaces of the two arc grooves 348 are fixedly connected with the two sides of the inner part of the sleeve 31. The top openings of the two arc grooves 348 are aligned with the discharge openings below the two hoppers 341. The inner part of the arc groove 348 is throughly connected with a drain pipe 349. The arc groove 348 and the drain pipe 349 can facilitate the unified backflow of the recovered pure water. The outer surface of the drain pipe 349 is fixedly connected with the body of the sleeve 31. One end of the drain pipe 349 is throughly connected with the inner part of one of the liquid tanks 2.

[0029] Meanwhile, the contents not described in detail in the specification all belong to the prior art known by those skilled in the art.

[0030] Working principle: first, the pickling solution and pure water along the direction of motion in turn into the inside of liquid tank 2, then the copper strip or aluminum bar (hereinafter referred to as copper strip) in turn through the sleeve 4 and sleeve 31, then the liquid pump in the inside of liquid tank 2 through the infusion tube 7 in turn pickling solution and pure water pump into the inner cavity 5, again through the overflow hole 6 makes it flow into the inside of sleeve 4 and copper strip surface contact, copper strip through the conveying mechanism in the sleeve 4 inside the continuous movement, to maintain the contact time with pickling solution and pure water, so that the surface of the copper strip is removed by pickling solution, and then through the pure water to rinse the residual pickling solution and reaction product, and the overflow of pickling solution and pure water through the liquid tank 8, baffle 9 and check valve 11, the effect of the inside of the steam tank 10, with heating strip 12 inside the steam tank 10 solution heating, pure water evaporation through the upper pipe 13 backflow to the corresponding liquid tank 2 inside, through condensation for recycling, and the concentrated pickling solution is filtered through the lower pipe 13, and then flows back to the corresponding liquid tank 2 inside for recycling; When the copper strip moves to the inside of sleeve 31 after rinsing, the arc block 311 slides along the ring rail 310, and the sliding block 313 slides along the straight rail 312, so as to wrap the cloth belt 33 on the surface of the copper strip, on the one hand, the adsorption area is increased, and on the other hand, the dryness of the copper strip is guaranteed. After the cloth belt 33 is wrapped, the two drive motors 38 drive the corresponding winding drums 35 to move synchronously and reversely, so as to wind the two ends of the cloth belt 33. At the same time, the output end of the adjusting rod 347 slides to the extended limit, so that the shaft end of the tension roller 345 moves to the middle position inside the sliding groove 344, so that the tension roller 345 stretches the cloth belt 33. Through the above steps, the cloth belt 33 is tightly wrapped on the surface of the copper strip; When the copper strip moves through the sleeve 31, the two drive motors 38 drive the corresponding winding drums 35 to rotate synchronously and in the same direction, so that the cloth belt 33 reciprocates, so that the copper strip surface is continuously treated by the cloth belt 33 at different positions. During the reciprocating movement of the cloth belt 33, it is extruded and dehydrated by contacting with the two extrusion rollers 343 on the frame 342. The extruded pure water flows into the arc groove 348 after being collected by the hopper 341, and then flows back to the corresponding liquid tank 2 inside through the drainage pipe 349 for recycling. When the cloth belt 33 adsorbs pure water on the surface of the copper strip, when there is too much residual pure water, the output end of the adjusting rod 347 is retracted, so that the tension roller 345 descends, so that the tightness of the cloth belt 33 wrapped on the surface of the copper strip is reduced, so that the cloth belt 33 can absorb more pure water, and the problem of pure water dripping caused by the mutual extrusion of the copper strip and the cloth belt 33 will not occur when the cloth belt 33 reaches the water absorption threshold. Conversely, when there is less residual pure water, the output end of the adjusting rod 347 is extended, so that the tension roller 345 rises to stretch the cloth belt 33, so as to improve the tightness of the cloth belt 33 and the copper strip surface, so as to improve the water absorption effect of the cloth belt 33.

[0031] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A method for preparing a thermal bimetallic strip, characterized in that: Specifically, the following steps are included: Step 1: Pass the copper strip or aluminum rod through the sliding sleeve (4) and sleeve (31) on the base (1) in sequence. Then, the liquid pump pumps the pickling solution and pure water inside the liquid tank (2) into the inner cavity (5) through the liquid delivery pipe (7), and flows into the sliding sleeve (4) through the overflow hole (6) to contact the surface of the copper strip or aluminum rod, thereby removing the oxide film and rinsing the surface of the copper strip or aluminum rod. Step 2: The cleaned copper strip or aluminum rod enters the sleeve (31). Through the movement of the arc block (311) and the slider (313), the cloth strip (33) is wrapped around the surface of the copper strip or aluminum rod. Then, the drum (35) is driven to rotate in both directions by the two drive motors (38), so that the cloth strip (33) absorbs the pure water on the surface of the copper strip or aluminum rod. Step 3: When the fabric belt (33) is repeatedly wound by the drum (35), it is dehydrated by the squeezing of the squeezing roller (343). At the same time, during the water absorption process, depending on the amount of water stains on the surface, the output end of the adjusting rod (347) extends and retracts, driving the tension roller (345) to move up and down through the bearing (346) so as to adjust the absorption effect by adjusting the tightness of the wrapping of the fabric belt (33). Step 4: Wrap the processed copper strip around the aluminum rod, then weld and continuously extrude at equal channel angles to obtain a copper-aluminum bimetallic material. Step 5: After heat treatment of the copper-aluminum bimetallic material, copper-aluminum bimetallic strips or copper-aluminum bimetallic rods are obtained by expansion extrusion or drawing.

2. The method for preparing a thermal bimetallic strip according to claim 1, characterized in that: The top of the base (1) is provided with an acid pickling mechanism, which includes two liquid tanks (2). The outer surfaces of the two liquid tanks (2) are fixedly connected to the outer surface of the base (1). A sliding sleeve (4) is provided above the two liquid tanks (2). The body of the two sliding sleeves (4) is provided with an inner cavity (5). The inner cavities (5) on both sides are connected to an overflow hole (6). The overflow hole (6) is opened inside the sliding sleeve (4). The inner cavity (5) is connected to the inner cavity of the liquid tank (2) through the inner cavity of the infusion pipe (7). A liquid tank (8) is sleeved on the outside of the infusion pipe (7). The outer surface of the liquid tank (8) is fixedly connected to the outer surface of the liquid tank (2). A partition (9) is fixedly connected inside the liquid tank (8). The body of the partition (9) is fixedly connected to the outer surface of the infusion pipe (7).

3. The method for preparing a thermal bimetallic strip according to claim 2, characterized in that: A steaming box (10) is provided between the outer surfaces of the two liquid tanks (2). Two one-way valves (11) are connected through the interior of the steaming box (10). One end of the two one-way valves (11) is connected through the interior of the liquid tanks (8) on both sides. A heating strip (12) is embedded and fixedly connected to the lower part of the interior of the steaming box (10). Connecting pipes (13) are connected through the upper and lower sides of the interior of the steaming box (10). One end of the connecting pipes (13) on both sides is connected through the interior of the two liquid tanks (2).

4. The method for preparing a thermal bimetallic strip according to claim 2, characterized in that: A drying assembly (3) is provided on the outside of one of the liquid tanks (2). The drying assembly (3) includes a sleeve (31). The outer surface of the sleeve (31) is fixedly connected to the outer surface of the base (1) through a fixed plate (32). A cloth belt (33) is movably connected inside the sleeve (31). Both ends of the cloth belt (33) are wound with a roller (35). The shaft ends of the rollers (35) on both sides are rotatably connected to a bracket (36). The outer surfaces of the brackets (36) on both sides are fixedly connected with a fixed rod. One end of one of the fixed rods is fixedly connected to the inside of the sleeve (31). The outer surfaces of the brackets (36) on both sides are fixedly connected with a drive motor (38). The output ends of the drive motors (38) on both sides are fixedly connected to the shaft ends of the two rollers (35) on one side through a coupling.

5. The method for preparing a thermal bimetallic strip according to claim 4, characterized in that: The sleeve (31) has an annular groove (39) inside, and an annular rail (310) is fixedly connected inside the annular groove (39). An arc block (311) is slidably connected to the outer surface of the annular rail (310). A straight rail (312) is fixedly connected to the outer surface of the arc block (311). A slider (313) is slidably connected to the outer surface of the straight rail (312). The outer surface of the slider (313) is fixedly connected to one end of another fixed rod.

6. The method for preparing a thermal bimetallic strip according to claim 5, characterized in that: A retaining ring (37) is provided on the outside of the straight rail (312), and the outer surface of the retaining ring (37) is fixedly connected to the inside of the sleeve (31).

7. The method for preparing a thermal bimetallic strip according to claim 4, characterized in that: A dewatering unit (34) is provided on the outside of the fabric belt (33). The dewatering unit (34) includes a hopper (341). The hopper (341) is located below the fabric belt (33). A frame (342) is fixedly connected to the top of the hopper (341). The frame (342) is sleeved on the outside of the fabric belt (33). Two extrusion rollers (343) are rotatably connected through the body of the frame (342). The outer surfaces of the two extrusion rollers (343) are movably connected to both sides of the outer surface of the fabric belt (33).

8. The method for preparing a thermal bimetallic strip according to claim 7, characterized in that: Both sides of the frame (342) body are provided with through grooves (344). The outer surface of the fabric belt (33) is movably connected to a tension roller (345). The two ends of the tension roller (345) are respectively movably connected to the inside of the two side grooves (344). Both ends of the tension roller (345) are fixedly connected to bearings (346). The outer surfaces of the bearings (346) on both sides are fixedly connected to adjusting rods (347). The outer surfaces of the adjusting rods (347) on both sides are fixedly connected to the outer surface of the frame (342).

9. The method for preparing a thermal bimetallic strip according to claim 7, characterized in that: Both sides of the hopper (341) are provided with arc grooves (348) below them. The outer surfaces of the two arc grooves (348) are fixedly connected to the two sides inside the sleeve (31). A drain pipe (349) is connected through the inside of the arc groove (348). The outer surface of the drain pipe (349) is fixedly connected through the body of the sleeve (31). One end of the drain pipe (349) is connected through the inside of one of the liquid tanks (2).

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