Leveling device for metal composite plate

Abstract

The utility model discloses a leveling device for a metal composite plate, which is characterized in that an outer shell is fixedly mounted on a rack, an inlet and an outlet are respectively arranged at two ends of the outer shell, a pre-pressing device for pre-pressing and leveling the composite plate is arranged close to the inlet, a plurality of leveling upper compression rollers and a plurality of leveling lower compression rollers are connected behind the pre-pressing device, and the leveling upper compression rollers and the leveling lower compression rollers are arranged on the rack. The lower leveling pressing roller is rotatably installed on the lower half portion of the outer shell, the upper leveling pressing roller is longitudinally adjusted and installed on the upper half portion of the outer shell through a longitudinal adjusting structure, the upper leveling pressing roller rotatably ascends and descends in the outer shell, and the upper leveling pressing roller and the lower leveling pressing roller are installed in an up-down staggered mode. A leveling upper lifting power device for driving the leveling upper pressing roller to lift is arranged on the outer shell; according to the leveling device, the downward pressing position of the leveling upper pressing roller can be adjusted, the leveling requirements of composite plates made of different materials can be met, and the leveling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite board processing equipment, in particular to a flattening device for metal composite boards. Background Technique

[0002] A metal composite board is composed of multiple layers of metal materials. According to the usage scenario, the composite board is composed of two layers of metals with different materials. Taking a three-layer metal composite board as an example, the upper and lower layers can generally be stainless steel layers to increase strength and wear resistance, while the middle layer can be filled with a galvanized board with a relatively low density and a relatively low price. In this way, compared with a pure stainless steel board of the same thickness, the composite board not only ensures the strength of the composite board but also reduces the cost.

[0003] After the metal composite board is bonded with glue, it needs to be flattened by a flattening device to ensure the flatness and straightening degree of the board, ensure the stability of the board during the processing process, and improve the quality and service performance of the board. Patent No. 202121978241.5 discloses a five-roll flattening device for aluminum production. This device drives the upper pressure roller to descend and cooperate with the lower pressure roller through worm and worm gear transmission, so that the composite board can be effectively flattened when passing between the upper pressure roller and the lower pressure roller. The upper pressure rollers are connected by an upper pressure roller frame and move up and down synchronously, and cannot be adjusted individually. Moreover, the upper pressure roller cannot move horizontally, and the staggered distance between the upper pressure roller and the lower pressure roller cannot be changed, so it cannot effectively flatten metal composite boards of different materials, and the flattening efficiency is low. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: a flattening device for metal composite boards, which can adjust the position where the flattening upper pressure roller presses down, adapt to the flattening requirements of composite boards of different materials, and improve the flattening effect.

[0005] To solve the above technical problem, the technical solution of the utility model is: a flattening device for metal composite boards, including a frame, an outer shell is fixedly installed on the frame, an inlet and an outlet are respectively arranged at both ends of the outer shell, a pre-pressing device for pre-pressing and flattening the composite board is arranged near the inlet, a plurality of flattening upper pressure rollers and a plurality of flattening lower pressure rollers are connected behind the pre-pressing device, the flattening lower pressure rollers are rotatably installed in the lower half of the outer shell, the flattening upper pressure rollers are longitudinally adjusted and installed in the upper half of the outer shell through a longitudinal adjustment structure, the flattening upper pressure rollers rotate and lift in the outer shell, the flattening upper pressure rollers and the flattening lower pressure rollers are installed vertically and staggeredly, and a flattening up-and-down power device for driving the flattening upper pressure rollers to lift is arranged on the outer shell.

[0006] As a preferred solution, the leveling lower pressing roller includes a lifting leveling lower pressing roller and a fixed leveling lower pressing roller. The lifting leveling lower pressing roller and the fixed leveling lower pressing roller are arranged in sequence behind the pre-pressing device. Both ends of the lifting leveling lower pressing roller are supported and rotated by lifting lower roller seats. The lifting lower roller seats are installed in the outer shell in a lifting and sliding manner. A leveling lower lifting power device for driving the lifting and sliding of the lifting lower roller seats is provided at the bottom of the outer shell. Both ends of the fixed leveling lower pressing roller are supported and rotated by fixed lower roller seats. The fixed lower roller seats are fixedly installed on the outer shell.

[0007] As a preferred solution, both ends of the leveling upper pressing roller are supported and rotated by lifting upper roller seats. The lifting upper roller seats are vertically constrained within a longitudinal sliding seat. The longitudinal sliding seat slides longitudinally on the outer shell. The longitudinal sliding seat is in an inverted L shape. A stepped groove matching the longitudinal sliding seat is provided on the outer shell. A limiting cover plate for limiting the longitudinal sliding seat is fixedly installed on the outer shell covering the stepped groove. A longitudinal fixing device for fixing the longitudinal sliding seat after sliding is provided on the limiting cover plate.

[0008] As a preferred solution, the longitudinal fixing device includes a threaded rod fixedly installed on the top of the longitudinal sliding seat. A limiting strip-shaped through hole is provided on the limiting cover plate. The threaded rod is constrained within the limiting strip-shaped through hole. A fixing nut for pressing and limiting the cover plate is spirally installed on the threaded rod.

[0009] As a preferred solution, the pre-pressing device includes a pre-pressing lower pressing roller and a pre-pressing upper pressing roller. The pre-pressing lower pressing roller and the pre-pressing upper pressing roller are vertically aligned. The pre-pressing lower pressing roller is supported and rotated by a pre-pressing lower roller seat. The pre-pressing lower roller seat is fixedly installed on the outer shell. The pre-pressing upper pressing roller is supported and rotated by a pre-pressing upper roller seat. The pre-pressing upper roller seat is installed in the outer shell in a lifting and sliding manner. The pre-pressing upper roller seat is driven to lift by a pre-pressing lifting power device.

[0010] As a preferred solution, both the leveling upper lifting power device and the leveling lower lifting power device are worm screw jacks. The worm screw jacks are respectively installed on the upper top surface and the lower bottom surface of the outer shell through mounting bottom plates. The mounting bottom plates are fixed to the upper top surface and the lower bottom surface of the outer shell by screws. The mounting bottom plate located on the upper top surface is provided with a longitudinal strip-shaped through hole identical to the limiting strip-shaped through hole.

[0011] As a preferred solution, a connecting rod connected to each other is provided between the lifting lower roller seat and the lifting upper roller seat. A connecting strip-shaped hole extending horizontally is provided on the connecting rod. The guiding rod of the worm screw jack passes through the connecting strip-shaped hole. A sliding nut moving horizontally is provided within the connecting rod. The guiding rod is threadedly fixed to the sliding nut. A pressing nut spirally installed on the guiding rod is also provided on the connecting rod.

[0012] After adopting the above technical solution, the effects of the present utility model are as follows: Since the leveling device for the metal composite plate includes a frame, an outer shell is fixedly installed on the frame. An inlet and an outlet are respectively provided at both ends of the outer shell. A pre-pressing device for pre-pressing and leveling the composite plate is provided near the inlet. A plurality of leveling upper rollers and a plurality of leveling lower rollers are connected behind the pre-pressing device. The leveling lower rollers are rotatably installed in the lower half of the outer shell. The leveling upper rollers are longitudinally adjusted and installed in the upper half of the outer shell through a longitudinal adjustment structure. The leveling upper rollers rotate and lift in the outer shell. The leveling upper rollers and the leveling lower rollers are installed in an up-and-down staggered manner. An up-and-down leveling power device for driving the leveling upper rollers to lift is provided on the outer shell. The composite plate is put in from the inlet, and then undergoes preliminary pre-pressing through the pre-pressing device to ensure that the composite plate can be effectively attached. At the same time, the longitudinal position of the leveling upper rollers is adjusted and the leveling upper rollers are lowered to form a roll-pressing gap with the leveling lower rollers. Then the composite plate continues to be conveyed and passes through the leveling upper rollers and the leveling lower rollers to complete the leveling of the composite plate. This leveling device can adjust the position where the leveling upper rollers press down, adapt to the leveling requirements of composite plates of different materials, and improve the leveling effect.

[0013] Also, since the leveling lower rollers include lifting leveling lower rollers and fixed leveling lower rollers, the lifting leveling lower rollers and the fixed leveling lower rollers are arranged in sequence behind the pre-pressing device. Both ends of the lifting leveling lower rollers are supported and rotated by lifting lower roller seats. The lifting lower roller seats are installed in the outer shell in a lifting and sliding manner. A lower leveling up-and-down power device for driving the lifting lower roller seats to lift and slide is provided at the bottom of the outer shell. Both ends of the fixed leveling lower rollers are supported and rotated by fixed lower roller seats. The fixed lower roller seats are fixedly installed on the outer shell. By driving the lifting leveling lower rollers to lift through the lower leveling up-and-down power device, the leveling height can be adjusted with the leveling upper rollers, so as to complete the change of the leveling requirements for composite plates of different materials.

[0014] Also, since both ends of the leveling upper rollers are supported and rotated by lifting upper roller seats, the lifting upper roller seats are vertically constrained in longitudinal sliding seats. The longitudinal sliding seats slide longitudinally on the outer shell. The longitudinal sliding seats are in an inverted L shape. A stepped groove matched with the longitudinal sliding seats is provided on the outer shell. A limiting cover plate for limiting the longitudinal sliding seats is fixedly installed on the outer shell and covers the stepped groove. A longitudinal fixing device for fixing the longitudinal sliding seats after sliding is provided on the limiting cover plate. The leveling upper rollers can effectively resist the lateral movement of the lifting upper roller seats and the longitudinal sliding seats at both ends. At the same time, the cover plate can also ensure that the vertical directions of the lifting upper roller seats and the longitudinal sliding seats are limited, making the movement of the longitudinal sliding seats accurate and the installation of the longitudinal sliding seats in the stepped groove convenient.

[0015] Also, since the longitudinal fixing device includes a threaded rod fixedly installed on the top of the longitudinal sliding seat, a limiting strip-shaped through hole is provided on the limiting cover plate, the threaded rod is constrained within the limiting strip-shaped through hole, and a fixing nut for pressing and limiting the cover plate is spirally installed on the threaded rod; when the longitudinal sliding seat slides, the threaded rod also slides accordingly. At the same time, the limiting strip-shaped hole can limit the moving range of the threaded rod, and then the fixing nut is tightened on the threaded rod to complete the fixing of the longitudinal sliding seat, with a simple structure and convenient use.

[0016] Also, since the pre-pressing device includes a pre-pressing lower roller and a pre-pressing upper roller, the pre-pressing lower roller and the pre-pressing upper roller are aligned vertically. The pre-pressing lower roller is supported and rotated by a pre-pressing lower roller seat, and the pre-pressing lower roller seat is fixedly installed on the outer housing. The pre-pressing upper roller is supported and rotated by a pre-pressing upper roller seat, and the pre-pressing upper roller seat is installed on the outer housing in a lifting and sliding manner, and the pre-pressing upper roller seat is driven to lift by a pre-pressing lifting power device; after the pre-pressing lower roller and the pre-pressing upper roller are aligned, the pre-pressing upper roller can effectively squeeze the composite board when it descends, and at the same time, further adhesion of the composite board is completed, improving the leveling efficiency.

[0017] Also, since both the leveling upper lifting power device and the leveling lower lifting power device are worm screw jacks, the worm screw jacks are respectively installed on the upper top surface and the lower bottom surface of the outer housing through mounting bases. The mounting bases are fixed to the upper top surface and the lower bottom surface of the outer housing by screws. The mounting base located on the upper top surface is provided with a longitudinal strip-shaped through hole identical to the limiting strip-shaped through hole; due to the sliding of the longitudinal sliding seat, the leveling upper roller will also slide accordingly, so that the worm screw jack also slides to facilitate driving the lifting. The installation of the mounting base is completed through the longitudinal strip-shaped hole to facilitate the fixing of the screws.

[0018] Also, since a connecting rod is provided between the lifting lower roller seat and the lifting upper roller seat, a connecting strip-shaped hole extending horizontally is provided on the connecting rod. The guide rod of the worm screw jack passes through the connecting strip-shaped hole, a sliding nut moving horizontally is provided inside the connecting rod, the guide rod is threadedly fixed to the sliding nut, and a pressing nut spirally installed on the guide rod is also provided on the connecting rod; the connecting strip-shaped hole can facilitate the passing of the guide rod of the worm screw jack and at the same time facilitate the fixed connection of the guide rod and the connecting rod, with a simple structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes the present invention in conjunction with the drawings and embodiments.

[0020] Figure 1 is a perspective view of an embodiment of the present invention;

[0021] Figure 2 is a top view of an embodiment of the present invention;

[0022] Figure 3 isFigure 2 Cross-sectional view at A - A;

[0023] Figure 4 It is a schematic structural diagram inside the housing of an embodiment of the present utility model;

[0024] In the drawings: 1, frame; 2, housing; 3, inlet; 4, outlet; 5, leveling upper pressure roller; 6, lifting leveling lower pressure roller; 7, fixed leveling lower pressure roller; 8, lifting lower roller seat; 9, fixed lower roller seat; 10, lifting upper roller seat; 11, longitudinal sliding seat; 12, step groove; 13, limit cover plate; 14, rectangular protrusion; 15, rectangular groove; 16, threaded rod; 17, limit strip-shaped through hole; 18, fixing nut; 19, pre-pressure lower pressure roller; 20, pre-pressure upper pressure roller; 21, pre-pressure lower roller seat; 22, pre-pressure upper roller seat; 23, pre-pressure cylinder; 24, worm screw lift; 25, mounting base plate; 26, longitudinal strip-shaped through hole; 27, connecting rod; 28, connecting strip-shaped hole; 29, sliding nut; 30, pressing nut. Specific embodiments

[0025] The present utility model will be further described in detail below through specific embodiments.

[0026] Longitudinally, it is convenient for the transportation of the composite board, and transversely is the installation direction of the leveling upper pressure roller 5.

[0027] As Figures 1 to 4 shown, a leveling device for a metal composite board includes a frame 1, on which a housing 2 is fixedly installed. At both ends of the housing 2, an inlet 3 and an outlet 4 are respectively provided. Near the inlet 3, a pre-pressure device for pre-pressure leveling of the composite board is provided. Behind the pre-pressure device, a plurality of leveling upper pressure rollers 5 and a plurality of leveling lower pressure rollers are connected. The leveling lower pressure rollers are rotatably installed in the lower half of the housing 2. The leveling upper pressure rollers 5 are longitudinally adjusted and installed in the upper half of the housing 2 through a longitudinal adjustment structure. The leveling upper pressure rollers 5 rotate and lift inside the housing 2. The leveling upper pressure rollers 5 and the leveling lower pressure rollers are installed in a staggered manner up and down. On the housing 2, a leveling lifting power device for driving the leveling upper pressure rollers 5 to lift is provided.

[0028] As Figure 3As shown, the leveling and pressing lower roller includes a lifting leveling and pressing lower roller 6 and a fixed leveling and pressing lower roller 7. The lifting leveling and pressing lower roller 6 and the fixed leveling and pressing lower roller 7 are arranged in sequence behind the pre-pressing device. Both ends of the lifting leveling and pressing lower roller 6 are supported and rotated by lifting lower roller seats 8. The lifting lower roller seats 8 are installed to lift and slide in the outer housing 2. A leveling lower lifting power device for driving the lifting and sliding of the lifting lower roller seats 8 is provided at the bottom of the outer housing 2. Both ends of the fixed leveling and pressing lower roller 7 are supported and rotated by fixed lower roller seats 9. The fixed lower roller seats 9 are fixedly installed on the outer housing 2. One lifting leveling and pressing lower roller 6 and one fixed leveling and pressing lower roller 7 are respectively provided in the lower half of the outer housing 2. The lifting leveling and pressing lower roller 6 is driven to lift by the leveling lower lifting power device, so that the leveling height can be adjusted with the leveling upper roller 5, thereby completing the change of the leveling requirements for composite boards of different materials.

[0029] As Figure 3 and Figure 4 shown, both ends of the leveling upper roller 5 are supported and rotated by lifting upper roller seats 10. The lifting upper roller seats 10 are restricted to lift and slide within the longitudinal sliding seat 11. The longitudinal sliding seat 11 longitudinally slides on the outer housing 2. The longitudinal sliding seat 11 is in an inverted L shape. A stepped groove 12 matching the longitudinal sliding seat 11 is provided on the outer housing 2. A limit cover plate 13 for limiting the longitudinal sliding seat 11 is fixedly installed on the outer housing 2 to cover the stepped groove 12. A longitudinal fixing device for fixing the longitudinal sliding seat 11 after sliding is provided on the limit cover plate 13. A rectangular protrusion 14 is provided on the lifting upper roller seat 10, and a rectangular groove 15 convenient for the sliding of the rectangular protrusion 14 is provided within the longitudinal sliding seat 11. In this way, when the leveling upper and lower power device drives the lifting upper roller seat 10 to lift, it is stable and reliable. The leveling upper roller 5 can effectively resist the transverse movement of the lifting upper roller seats 10 and the longitudinal sliding seat 11 at both ends. At the same time, the cover plate can also ensure that the lifting upper roller seats 10 and the longitudinal sliding seat 11 are limited in the vertical direction, enabling the longitudinal sliding seat 11 to move accurately and being convenient for the longitudinal sliding seat 11 to be installed in the stepped groove 12.

[0030] As Figure 1 and Figure 2 shown, the longitudinal fixing device includes a threaded rod 16 fixedly installed on the top of the longitudinal sliding seat 11. A limit strip-shaped through hole 17 is provided on the limit cover plate 13. The threaded rod 16 is constrained within the limit strip-shaped through hole 17. A fixing nut 18 for pressing and limiting the cover plate 13 is spirally installed on the threaded rod 16. The movement of the threaded rod 16 within the limit strip-shaped through hole 17 can not only ensure the stable sliding of the longitudinal sliding seat 11, but also limit the sliding range, while being convenient for driving the sliding and fixing.

[0031] As Figure 1 and Figure 3As shown, the pre-pressing device includes a pre-pressing lower roller 19 and a pre-pressing upper roller 20, which are vertically aligned. The pre-pressing lower roller 19 is supported and rotated by a pre-pressing lower roller seat 21, and the pre-pressing lower roller seat 21 is fixedly installed on the outer housing 2. The pre-pressing upper roller 20 is supported and rotated by a pre-pressing upper roller seat 22, and the pre-pressing upper roller seat 22 is installed on the outer housing 2 in a lifting and sliding manner, and the pre-pressing upper roller seat 22 is driven to lift by a pre-pressing lifting power device; the pre-pressing lifting power device includes a pre-pressing cylinder 23, and the pre-pressing cylinder 23 is fixedly installed on the upper top surface of the outer housing 2. Then, the guide rod of the pre-pressing cylinder 23 penetrates through the upper top surface and is connected to a connecting rod 27 between the pre-pressing upper roller seats 22, so as to drive the pre-pressing upper roller seat 22 to lift. At the same time, a rectangular groove 15 is provided on the outer housing 2, and a rectangular protrusion 14 is provided on the pre-pressing upper roller seat 22. In this way, the pre-pressing upper roller seat 22 can be embedded into the outer housing 2, so as to complete accurate lifting, and can further bond and press the composite board entering from the inlet 3 and perform preliminary leveling, which is convenient for subsequent processing.

[0032] In this embodiment, both the leveling upper lifting power device and the leveling lower lifting power device are worm screw elevators 24. The worm screw elevators 24 are respectively installed on the upper top surface and the lower bottom surface of the outer housing 2 through mounting bases 25. The mounting bases 25 are fixed to the upper top surface and the lower bottom surface of the outer housing 2 by screws. The mounting base 25 located on the upper top surface is provided with a longitudinal bar-shaped through hole 26 identical to the limit bar-shaped through hole 17; there are two leveling upper rollers 5, and the lifting leveling lower roller 6 is located between the two leveling upper rollers 5, so as to facilitate the adjustment of the gap between the leveling upper roller 5, the lifting leveling lower roller 6 and the fixed leveling lower roller 7, and perform different leveling on composite boards of different materials; due to the sliding of the longitudinal sliding seat 11, the leveling upper roller 5 will also slide accordingly, so that the worm screw elevator 24 will also slide to facilitate driving the lifting. The mounting of the mounting base 25 is completed by fixing the screws through the longitudinal bar-shaped holes. The worm screw elevator 24 is a structure existing on the market, so it will not be described in detail in the text.

[0033] Further, a connecting rod 27 is provided between the lifting lower roller seat 8 and the lifting upper roller seat 10. The connecting rod 27 is provided with a transversely extending connecting bar-shaped hole 28. The guide rod of the worm screw elevator 24 passes through the connecting bar-shaped hole 28. A sliding nut 29 that moves horizontally is provided inside the connecting rod 27. The guide rod is threadedly fixed to the sliding nut 29. A pressing nut 30 that is spirally installed on the guide rod is also provided on the connecting rod 27; the connecting bar-shaped hole 28 can facilitate the passing of the guide rod of the worm screw elevator 24, and at the same time facilitate the fixed connection between the guide rod and the connecting rod 27. The structure is simple and easy to use.

[0034] Working principle of this embodiment: First, place the composite board into the inlet 3. The pre-pressing cylinder 23 drives the pre-pressing upper roller 20 to descend, and cooperate with the pre-pressing lower roller 19 to tightly press the composite board. At the same time, the composite board continues to be conveyed. Slide the longitudinal sliding seat 11 to adjust the longitudinal positions of the two leveling upper rollers 5. Then, the worm gear screw elevator 24 drives the leveling upper roller 5 to descend, and at the same time, the worm gear screw elevator 24 drives the lifting leveling lower roller 6 to ascend, so that the leveling upper roller 5 and the lifting leveling lower roller 6 are at appropriate heights to level the composite board. Then, the composite board is sent out from the outlet 4.

[0035] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and modifications made to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A leveling device for a metal composite plate, comprising a frame, and an outer shell fixedly installed on the frame, characterized in that: Both ends of the outer shell are respectively provided with an inlet and an outlet. A pre-pressing device for pre-pressing and leveling the composite board is provided near the inlet. A plurality of leveling upper pressing rollers and a plurality of leveling lower pressing rollers are connected behind the pre-pressing device. The leveling lower pressing rollers are rotatably installed in the lower half of the outer shell. The leveling upper pressing rollers are longitudinally adjusted and installed in the upper half of the outer shell through a longitudinal adjustment structure. The leveling upper pressing rollers rotate and lift in the outer shell. The leveling upper pressing rollers and the leveling lower pressing rollers are installed in a staggered manner up and down. A leveling up-and-down power device for driving the leveling upper pressing rollers to lift is provided on the outer shell.

2. The flattening device for a metal composite plate as described in claim 1, characterized in that: The leveling lower pressing rollers include lifting leveling lower pressing rollers and fixed leveling lower pressing rollers. The lifting leveling lower pressing rollers and the fixed leveling lower pressing rollers are arranged in sequence behind the pre-pressing device. Both ends of the lifting leveling lower pressing rollers are supported and rotated by lifting lower roller seats. The lifting lower roller seats are installed in the outer shell in a lifting and sliding manner. A leveling lower up-and-down power device for driving the lifting lower roller seats to lift and slide is provided at the bottom of the outer shell. Both ends of the fixed leveling lower pressing rollers are supported and rotated by fixed lower roller seats. The fixed lower roller seats are fixedly installed on the outer shell.

3. The flattening device for a metal composite plate as described in claim 2, characterized in that: Both ends of the leveling upper pressing rollers are supported and rotated by lifting upper roller seats. The lifting upper roller seats are constrained to lift in the longitudinal sliding seats. The longitudinal sliding seats slide longitudinally on the outer shell. The longitudinal sliding seats are in an inverted L shape. A stepped groove matched with the longitudinal sliding seats is provided on the outer shell. A limit cover plate for limiting the longitudinal sliding seats is fixedly installed on the outer shell and covers the stepped groove. A longitudinal fixing device for fixing the longitudinal sliding seats after sliding is provided on the limit cover plate.

4. The flattening device for a metal composite plate as described in claim 3, characterized in that: The longitudinal fixing device includes a threaded rod fixedly installed on the top of the longitudinal sliding seat. A limit strip-shaped through hole is provided on the limit cover plate. The threaded rod is constrained in the limit strip-shaped through hole. A fixing nut for pressing and limiting the cover plate is screwed on the threaded rod.

5. The flattening device for a metal composite plate as described in claim 1, characterized in that: The pre-pressing device includes a pre-pressing lower pressing roller and a pre-pressing upper pressing roller. The pre-pressing lower pressing roller and the pre-pressing upper pressing roller are aligned up and down. The pre-pressing lower pressing roller is supported and rotated by a pre-pressing lower roller seat. The pre-pressing lower roller seat is fixedly installed on the outer shell. The pre-pressing upper pressing roller is supported and rotated by a pre-pressing upper roller seat. The pre-pressing upper roller seat is installed in the outer shell in a lifting and sliding manner. The pre-pressing upper roller seat is driven to lift by a pre-pressing up-and-down power device.

6. The flattening device for a metal composite plate as described in claim 4, characterized in that: Both the leveling up-and-down power device and the leveling lower up-and-down power device are worm screw jacks. The worm screw jacks are respectively installed on the upper top surface and the lower bottom surface of the outer shell through mounting bottom plates. The mounting bottom plates are fixed to the upper top surface and the lower bottom surface of the outer shell by screws. The mounting bottom plate located on the upper top surface is provided with a longitudinal strip-shaped through hole identical to the limit strip-shaped through hole.

7. The flattening device for a metal composite plate as described in claim 6, characterized in that: A connecting rod connected to each other is provided between the lifting lower roller seats and the lifting upper roller seats. A connecting strip-shaped hole extending horizontally is provided on the connecting rod. The guiding rod of the worm screw jack passes through the connecting strip-shaped hole. A sliding nut moving horizontally is provided in the connecting rod. The guiding rod is fixedly threaded with the sliding nut. A pressing nut screwed on the guiding rod is also provided on the connecting rod.

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