A metal sheet bending machine for curtain wall production

Abstract

The present invention belongs to the technical field of bending machines, and specifically relates to a metal sheet bending machine for curtain wall production, comprising a bending machine main body and a hydraulic cylinder arranged on the bending machine main body, the output end of the hydraulic cylinder is connected to a lifting plate slidingly arranged with the bending machine main body, and a lower mold is arranged on the bending machine main body. The metal sheet bending machine for curtain wall production, after pressing the pressing rod, pulls it to separate the snap buckle from the limiting bar, thereby completing the separation between the sliding blocks and the sliding blocks or between the sliding blocks and the central fixed block, thereby simultaneously sliding multiple sliding blocks, thereby simultaneously loosening the mounting plates on the multiple sliding blocks, thereby directly disassembling the upper mold, through the cooperation of the limiting hook on the mounting plate and the extension plate, in the process of pulling the sleeve rod, the extension plate squeezes the limiting hook, so that the multiple limiting hooks release the restriction on the upper mold, so that the upper mold can directly fall out from under the mounting plate, avoiding the need to slide the upper mold out from one side of the mounting plate.

Description

Technical Field

[0001] The invention belongs to the technical field of bending machines, and in particular relates to a metal plate bending machine for curtain wall production. Background Art

[0002] A curtain wall is a protective structure suspended outside a building's main structure. Composed of panels and a supporting frame, it boasts aesthetic appeal, excellent lighting, and lightweight features, making it widely used in modern high-rise buildings. Press brakes, commonly used in curtain wall production, are key equipment for bending materials like sheet metal into the desired shape. By combining upper and lower molds, driven by hydraulic or mechanical power, they apply pressure to the sheet, causing it to plastically deform. This allows them to produce the various curved shapes, such as right-angle and curved, required for the curtain wall framework. Press brakes are crucial for ensuring the precision and quality of curtain wall components.

[0003] Currently, the molds of sheet metal bending machines used in curtain wall production generally adopt a multi-section splicing structure. Each section of the mold is spliced ​​together with different lengths, and the mold combination length can be flexibly adjusted according to actual production needs. Although this splicing design can meet diverse processing scenarios, it requires multiple fixtures to position and fix each section of the mold. When it comes to mold replacement, the operator needs to unlock each fixture one by one before completing the removal of the old mold and the installation of the new mold, which to a certain extent affects the efficiency of tooling switching. To this end, a sheet metal bending machine for curtain wall production is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a metal sheet bending machine for curtain wall production with rapid mold replacement in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A sheet metal bending machine for curtain wall production, comprising a bending machine body and a hydraulic cylinder arranged on the bending machine body, wherein the output end of the hydraulic cylinder is connected to a lifting plate slidably arranged with the bending machine body, a lower die is arranged on the bending machine body, a connecting seat is fixedly arranged at the lower end of the lifting plate, a mounting plate is slidably arranged on the connecting seat, and an upper die is arranged between the connecting seat and the mounting plate;

[0007] Also included are:

[0008] A central fixing block, the central fixing block is fixedly arranged on the connecting seat,

[0009] Sliding blocks, wherein a plurality of sliding blocks are provided and slidingly arranged on both sides of the central fixed block, the sliding blocks abut against each other, and a pressure ring is provided on one side of the sliding block to press and fix the position of the mounting plate;

[0010] Snap buckles, the snap buckles are fixedly arranged at one end of the sliding block and at both ends of the central fixed block;

[0011] A restriction bar, which is fixedly arranged at one end of the sliding block and limits the position of the snap-fit ​​buckle;

[0012] An unlocking mechanism, wherein the unlocking mechanism is provided on the sliding block;

[0013] The sliding frame is slidably arranged in the sliding block, and the sliding frame is driven to move on the sliding block through the unlocking mechanism, so that the restriction bar releases the restriction on the snap buckle.

[0014] As a further optimization solution of the present invention, a mounting bolt is slidably provided on the mounting plate, and the mounting bolt is fixedly provided on the connecting seat. A movable groove is opened on the mounting plate, and a bevel ring is provided in the movable groove, and the surface of the bevel ring is a bevel.

[0015] As a further optimization scheme of the present invention, the sliding block is a trapezoidal structure, a through slot 1 is provided on the sliding block, a sleeve rod is fixedly provided on the sliding block, the sleeve rod is slidably provided in the movable slot, the sleeve rod is connected with the through slot 1, the pressure ring is sleeved on the sleeve rod, the two sides of the pressure ring are set as inclined surfaces, the pressure ring is slidably provided on the inclined surface ring, and an extension plate is provided on the pressure ring.

[0016] As a further optimization scheme of the present invention, the unlocking mechanism includes a pressing rod, which is slidably arranged in the sleeve rod, a protruding rod is fixedly arranged at one end of the pressing rod, and the protruding rod is vertically arranged on both sides of the pressing rod, and a spring 2 is fixedly arranged between the pressing rod and the through slot 1.

[0017] As a further optimization scheme of the present invention, the sliding frame is a hollow structure with openings on both sides, and oblique grooves are provided on the upper and lower surfaces of the sliding frame. The pressing rod is slidably set in the oblique groove, and a release plate is fixedly set at one end of the sliding frame away from the snap buckle, and convex strips are provided on both sides of the release plate.

[0018] As a further optimization scheme of the present invention, the limiting bar is slidingly arranged on the upper and lower sides of one end of the through slot, a slide rod 2 is fixedly arranged on the limiting bar, the slide rod 2 is slidingly arranged on the through slot 1, a spring 3 is sleeved on the slide rod 2, the two ends of the spring 3 are respectively connected to the through slot 1 and the limiting bar, and one side of the limiting bar is set with a slope.

[0019] As a further optimization scheme of the present invention, the snap-fit ​​buckle is a frustum structure, and brackets are fixedly provided at one end of the sliding block and both ends of the central fixed block. The snap-fit ​​buckle is fixed on the bracket, and a gap is left between the two sides of the bracket and the through slot, and the limit release plate can be embedded in the gap.

[0020] As a further optimization scheme of the present invention, a limiting hook is slidingly provided on the mounting plate, a mounting groove is opened on the mounting plate, the limiting hook is slidably provided in the mounting groove, a plurality of sliding rods are fixedly provided on the limiting hook, the sliding rods are slidingly provided on the mounting plate, an extrusion plate is obliquely fixed between the plurality of sliding rods, a spring is sleeved on the sliding rod, the two ends of the spring are respectively fixedly connected to the mounting plate and the extrusion plate, and the extension plate is embedded between the extrusion plate and the mounting plate.

[0021] As a further optimization scheme of the present invention, a sliding groove is provided on the connecting seat, the sliding block is slidably set in the sliding groove, a connecting plate is fixedly set on the connecting seat, a pressure plate is fixedly set on the lifting plate, and the connecting plate is fixedly set on the lifting plate through the pressure plate.

[0022] As a further optimization solution of the present invention, the central fixed block is fixedly arranged in the slide groove, the central fixed block has the same cross section as the sliding block, a second through groove is opened on the central fixed block, and the bracket is fixed in the second through groove.

[0023] The beneficial effects of the present invention are:

[0024] 1. Different from the existing technology, in actual use, after pressing the pressing rod, it is pulled to separate the snap buckle from the limiting bar, thereby completing the separation between the sliding blocks or between the sliding blocks and the central fixed block. In this way, multiple sliding blocks can be slid at the same time, thereby simultaneously loosening the mounting plates on multiple sliding blocks, thereby directly disassembling the upper mold without manually unlocking the mounting plates one by one.

[0025] 2. Different from the existing technology, in actual use, through the cooperation between the limiting hooks on the mounting plate and the extension plate, when the sleeve rod is pulled, the extension plate squeezes the limiting hooks, so that multiple limiting hooks release the restrictions on the upper mold, so that the upper mold can be directly removed from the bottom of the mounting plate, avoiding the need to slide the upper mold out from one side of the mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This invention Figure 1 Schematic diagram of the structure without the shield plate;

[0028] Figure 3 It is a schematic diagram of the lifting plate structure of the present invention;

[0029] Figure 4 This invention Figure 3 A in the middle is an enlarged structural diagram;

[0030] Figure 5 This invention Figure 3 Schematic diagram of explosion structure;

[0031] Figure 6 This invention Figure 5 The enlarged structural diagram at B in the middle;

[0032] Figure 7 This is a schematic diagram of the structure of the central fixed block of the present invention;

[0033] Figure 8 This is a schematic diagram of the connection structure of the mounting plate of the present invention;

[0034] Figure 9 This invention Figure 8 Schematic diagram of explosion structure;

[0035] Figure 10 This is a schematic diagram of the partial cross-sectional structure of the sliding block of the present invention;

[0036] Figure 11 This invention Figure 10 Schematic diagram of the structure of the sliding frame is removed;

[0037] Figure 12 It is a structural schematic diagram of the sliding frame of the present invention.

[0038] Figure: 1. Press brake body; 2. Lifting plate; 3. Connecting seat; 31. Slide groove; 32. Connecting plate; 33. Pressing plate; 4. Mounting plate; 41. Mounting bolt; 42. Moving groove; 421. Bevel ring; 5. Sliding block; 51. Sleeve rod; 511. Pressing ring; 512. Extension plate; 52. Through groove 1; 6. Center fixing block; 61. Through groove 2; 7. Limiting hook; 71. Sliding rod 1; 72 , spring one; 73, extrusion plate; 74, mounting slot; 8, unlocking mechanism; 81, pressing rod; 82, protruding rod; 83, spring two; 9, sliding frame; 91, inclined slot; 92, release plate; 921, protruding strip; 10, snap buckle; 101, bracket; 11, limiting strip; 111, sliding rod two; 112, spring three; 12, lower mold; 13, upper mold; 14, hydraulic cylinder; 15, shield plate. DETAILED DESCRIPTION

[0039] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0040] Example 1: Figure 1 - Figure 12As shown, a metal sheet bending machine for curtain wall production includes a bending machine body 1 and a hydraulic cylinder 14 arranged on the bending machine body 1. A shield plate 15 is provided on the bending machine body 1, and a controller is provided on one side through a bracket. The hydraulic cylinder 14 is arranged in the shield plate 15, and the output end of the hydraulic cylinder 14 is connected to a lifting plate 2 which is slidably arranged with the bending machine body 1. A lower die 12 is provided on the bending machine body 1, and a connecting seat 3 is fixedly provided at the lower end of the lifting plate 2. A mounting plate 4 is slidably provided on the connecting seat 3, and an upper die 13 is provided between the connecting seat 3 and the mounting plate 4. The hydraulic cylinder 14 can drive the lifting plate 2 to slide up and down, thereby driving the connecting seat 3 and the mounting plate 4 to move, so that the upper die 13 and the lower die 12 cooperate to complete the bending operation of the metal sheet. The operation of the hydraulic cylinder 14 and the like is controlled by the controller, and the hydraulic drive ensures the stability and power output of the lifting process, which is convenient for precise control of the bending force and position.

[0041] A central fixing block 6 is fixedly provided on the connecting seat 3, and a plurality of sliding blocks 5 are slidingly provided on both sides of the central fixing block 6. The sliding blocks 5 abut against each other. The sliding blocks 5 are of a trapezoidal structure. A through slot 52 is provided on the sliding block 5. A sleeve rod 51 is fixedly provided on the sliding block 5. The sleeve rod 51 is connected to the through slot 52. A pressure ring 511 is provided on the sleeve rod 51. The side of the pressure ring 511 is set as an inclined surface. The pressure ring 511 slides with the mounting plate 4. An extension plate 512 is provided on the pressure ring 511. , the extension plate 512 always has a certain distance from the mounting plate 4; a snap-fit ​​buckle 10 is fixedly provided at one end of the sliding block 5 and at both ends of the central fixed block 6, a limiting bar 11 is fixedly provided at one end of the sliding block 5, and the position of the snap-fit ​​buckle 10 is limited by the limiting bar 11, an unlocking mechanism 8 is provided on the sliding block 5, and the unlocking mechanism 8 includes a pressing rod 81, the pressing rod 81 is slidably set in the sleeve rod 51, and a protruding rod 82 is fixedly provided at one end of the pressing rod 81, and a pulley is provided on the protruding rod 82. The locking mechanism 811 is fixed on both sides of the pressing rod 81, and a spring 283 is fixedly provided between the pressing rod 81 and the through slot 1 52. A sliding frame 9 is slidably provided in the sliding block 5, and the sliding frame 9 is driven to move on the sliding block 5 by the unlocking mechanism 8, and the limiting bar 11 is released from the restriction of the snap buckle 10. The design of multiple sliding blocks 5 abutting each other can drive the other sliding blocks 5 to move synchronously by moving one sliding block 5, improving the operation efficiency; the pressing ring 511 presses the mounting plate 4 to fix the upper mold 13, ensuring the stability of the upper mold 13 during bending; the snap buckle 10 cooperates with the limiting bar 11 to lock the position of the sliding block 5 to prevent it from loosening during work; the sleeve rod 51 provides a sliding space for the pressing rod 81, and the unlocking mechanism 8 drives the sliding frame 9 to move when pressed through the pressing rod 81, the protruding rod 82, the spring 283 and the sliding frame 9, and then squeezes the limiting bar 11 through the release plate 92 to release the restriction of the snap buckle 10, thereby realizing the unlocking of the sliding block 5, which is convenient for operation.

[0042] When the cam 31 is in the unlock state, the sliding block 31 is fixed on the lifting plate 2, and the sliding block 5 is fixed on the lifting plate 2. The sliding block 31 is fixed on the lifting plate 2, and the sliding block 5 is fixed on the lifting plate 2. The sliding block 31 is fixed on the lifting plate 2, and the sliding block 5 is fixed on the lifting plate 2. The sliding block 31 is fixed on the lifting plate 2.

[0043] The cam 421 of the embodiment of the present invention is a kind of cam 421, and the cam 421 of the embodiment of the present invention is a kind of cam 421, and the cam 421 of the embodiment of the present invention is a kind of cam 421.

[0044] There are two limiting bars 11, which are slidably arranged on the upper and lower sides of one end of the through slot 1 52. A sliding rod 2 111 is fixedly arranged on the limiting bar 11, and the sliding rod 2 111 is slidably arranged on the through slot 1 52. A spring 3 112 is sleeved on the sliding rod 111, and the two ends of the spring 3 112 are respectively connected to the through slot 1 52 and the limiting bar 11. One side of the limiting bar 11 is set with an inclined surface. The limiting bar 11 is slidably arranged on the upper and lower sides of one end of the through slot 1 52 through the sliding rod 2 111 and the spring 3 112. When squeezed by the sliding frame 9, it can overcome the elastic force of the spring 3 112 and open to both sides, thereby releasing the restriction on the snap buckle 10. When the external force disappears, the spring 3 112 can drive the limiting bar 11 to reset and re-jam the snap buckle 10 to achieve automatic locking and unlocking.

[0045] The convex strips 921 on both sides of the release plate 92 can accurately squeeze the restriction bar 11, so that the restriction bar 11 opens to both sides, thereby unlocking the clip 10.

[0046] The snap buckle 10 is a frustum structure, and a bracket 101 is fixedly provided at one end of the sliding block 5 and both ends of the central fixed block 6. The snap buckle 10 is fixedly provided on the bracket 101, and a gap is left between the two sides of the bracket 101 and the through slot 1 52, and the limit release plate 92 can be embedded in the gap. The inclined surface design on one side of the limiting bar 11 cooperates with the snap buckle 10 of the frustum structure, so that the snap buckle 10 can be directly pushed into the inner side of the limiting bar 11. At the same time, the snap buckle 10 of the frustum structure cooperates with the limiting bar 11 to form a stable snap-fit ​​state to prevent the sliding block 5 from moving during work; the bracket 101 fixes the snap buckle 10 and provides support for it. At the same time, the gap between the two sides of the bracket 101 and the through slot 1 52 provides space for the embedding of the limit release plate 92, so that the sliding blocks 5 can be closely abutted against each other.

[0047] A limiting hook 7 is slidably provided on the mounting plate 4, and a mounting groove 74 is opened on the mounting plate 4. The limiting hook 7 is slidably provided in the mounting groove 74. Two sliding rods 71 ​​are fixedly provided on the limiting hook 7. The sliding rods 71 ​​are one long and one short, and are slidably provided on the mounting plate 4. An extrusion plate 73 is obliquely fixed between the sliding rods 71. A spring 72 is sleeved on the sliding rod 71. The two ends of the spring 72 are fixedly connected to the mounting plate 4 and the extrusion plate 73 respectively. The extension plate 512 is embedded in the extrusion plate 73. Between the extension plate 512 and the mounting plate 4, the limiting hook 7 is slidably set on the mounting plate 4 through a slide rod 71, a spring 72 and an extrusion plate 73. When the extension plate 512 is embedded between the extrusion plate 73 and the mounting plate 4 and moves, the extrusion plate 73 can be pushed to make the limiting hook 7 retract into the mounting groove 74, thereby releasing the hooking effect of the limiting hook 7 on the upper mold 13. When the extension plate 512 no longer squeezes the extrusion plate 73, the spring 72 can drive the limiting hook 7 to extend and re-hook the upper mold 13 to prevent the upper mold 13 from falling out from below.

[0048] It should be noted that the working principle of the metal sheet bending machine for curtain wall production is as follows:

[0049] When the upper mold 13 needs to be replaced, the unlocking mechanism 8 is first selected according to the length of the upper mold 13, and the pressing rod 81 set in the sleeve rod 51 is pressed. The protruding rod 82 and the pulley at one end of the pressing rod 81 cooperate with the inclined groove 91 on the sliding frame 9. When the pressing rod 81 is pressed down, the protruding rod 82 slides along the inclined groove 91, driving the sliding frame 9 to move in the sliding block 5. The release plate 92 at one end of the sliding frame 9 away from the snap buckle 10 moves accordingly, and the convex strips 921 on both sides of the release plate 92 squeeze the restriction strip 11. The restriction strip 11 is slidably set on the upper and lower sides of one end of the through slot 1 52, and one side of it is an inclined surface. Under the pressure of the convex strip 921 on the release plate 92, it overcomes the elastic force of the spring 3 112 on the slide rod 2 111 and opens to both sides, thereby releasing the restriction on the snap buckle 10, so that the restriction strip 11 can be separated from the snap buckle 10.

[0050] After the limiting bar 11 is separated from the snap-fit ​​buckle 10, the sleeve rod 51 is pulled toward the side away from the center fixed block 6, driving the sliding block 5 to slide in the slide groove 31 of the connecting seat 3. Since multiple sliding blocks 5 abut against each other, when one sliding block 5 is moved, multiple sliding blocks 5 move synchronously. The pressure ring 511 on the sliding block 5 moves in the moving groove 42 of the mounting plate 4. Since the side of the pressure ring 511 is a bevel, when the limiting hook 7 is located in the upper mold 13, the bevel of the pressure ring 511 contacts the widest end of the bevel ring 421. The sleeve rod 51 is moved to move the pressure ring 511 along the moving groove 42, causing the bevel of the pressure ring 511 to move toward the narrowest end of the bevel ring 421, so that the mounting plate 4 can slide on the mounting bolt 41 fixed to the connecting seat 3, and no longer squeezes and fixes the upper mold 13.

[0051] During the movement of the sleeve rod 51, the extension plate 512 on the pressure ring 511 moves in the gap between the extrusion plate 73 and the mounting plate 4. Because the extrusion plate 73 is tilted, the extension plate 512 pushes against it, causing the slide bar 1 71 fixed to the extrusion plate 73 to retract the restriction hook 7 into the mounting groove 74 of the mounting plate 4, overcoming the elastic force of the spring 1 72. This completely releases the multiple mounting plates 4 from securing the upper die 13, while the restriction hook 7 retracts. The upper die 13 is no longer restricted and can be removed directly, avoiding the cumbersome traditional operation of sliding it out from one side. This is achieved by performing operations on both sides of the central fixing block 6 to replace the upper die 13.

[0052] When installing a new upper mold 13, after placing it in place, the pressing rod 81 is released. Under the action of spring 2 83, the pressing rod 81 returns to its original position, and the sliding frame 9 and the release plate 92 also return to their original position. By pulling the sleeve rod 51, the multiple sliding blocks 5 move until the snap-fit ​​buckle 10 in the central fixing block 6 fits between the limiting bars 11. At this point, the pressing ring 511 re-engages with the bevel ring 421, pressing the mounting plate 4 to secure the upper mold 13. Simultaneously, as the sleeve rod 51 returns to its original position, the extension plate 512 no longer compresses the pressing plate 73. The limiting hook 7, under the action of spring 1 72, extends and re-engages the upper mold 13, preventing it from falling out from below. This completes the replacement and securing of the upper mold 13.

[0053] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A sheet metal bending machine for curtain wall production, comprising a bending machine body (1) and a hydraulic cylinder (14) arranged on the bending machine body (1), wherein the output end of the hydraulic cylinder (14) is connected to a lifting plate (2) slidably arranged with the bending machine body (1), and a lower die (12) is arranged on the bending machine body (1), characterized in that: A connecting seat (3) is fixedly provided at the lower end of the lifting plate (2), a mounting plate (4) is slidably provided on the connecting seat (3), and an upper mold (13) is provided between the connecting seat (3) and the mounting plate (4); Also included are: A central fixing block (6), wherein the central fixing block (6) is fixedly arranged on the connecting seat (3), Sliding blocks (5), wherein a plurality of sliding blocks (5) are provided and are slidably arranged on both sides of a central fixed block (6), wherein the sliding blocks (5) abut against each other, and a pressing ring (511) is provided on one side of the sliding block (5), and the mounting plate (4) is pressed and fixed in position by the pressing ring (511); A snap-fit ​​buckle (10), wherein the snap-fit ​​buckle (10) is fixedly arranged at one end of the sliding block (5) and at both ends of the central fixed block (6); A limiting strip (11), wherein the limiting strip (11) is fixedly arranged at one end of the sliding block (5), and the position of the snap-fit ​​buckle (10) is limited by the limiting strip (11); An unlocking mechanism (8), wherein the unlocking mechanism (8) is arranged on the sliding block (5); A sliding frame (9), wherein the sliding frame (9) is slidably arranged in the sliding block (5), and the unlocking mechanism (8) drives the sliding frame (9) to move on the sliding block (5), so that the restriction bar (11) releases the restriction on the snap-fit ​​buckle (10); A mounting bolt (41) is slidably provided on the mounting plate (4), and the mounting bolt (41) is fixedly provided on the connecting seat (3). A movable groove (42) is provided on the mounting plate (4), and a bevel ring (421) is provided in the movable groove (42), and the surface of the bevel ring (421) is a bevel. The sliding block (5) is a trapezoidal structure. A through slot (52) is provided on the sliding block (5). A sleeve rod (51) is fixedly provided on the sliding block (5). The sleeve rod (51) is slidably provided in the movable slot (42). The sleeve rod (51) is communicated with the through slot (52). The pressure ring (511) is sleeved on the sleeve rod (51). Both sides of the pressure ring (511) are provided with inclined surfaces. The pressure ring (511) is slidably provided on the inclined surface ring (421). An extension plate (512) is provided on the pressure ring (511). The limiting strip (11) is slidably arranged on the upper and lower sides of one end of the through slot one (52), and a sliding rod two (111) is fixedly arranged on the limiting strip (11), and the sliding rod two (111) is slidably arranged on the through slot one (52), and a spring three (112) is sleeved on the sliding rod two (111), and the two ends of the spring three (112) are respectively connected to the through slot one (52) and the limiting strip (11), and one side of the limiting strip (11) is provided with an inclined surface; A limiting hook (7) is slidably provided on the mounting plate (4), a mounting groove (74) is provided on the mounting plate (4), the limiting hook (7) is slidably provided in the mounting groove (74), a plurality of sliding rods (71) are fixedly provided on the limiting hook (7), the sliding rods (71) are slidably provided on the mounting plate (4), an extrusion plate (73) is obliquely fixedly provided between the plurality of sliding rods (71), a spring (72) is sleeved on the sliding rod (71), the two ends of the spring (72) are fixedly connected to the mounting plate (4) and the extrusion plate (73), respectively, and the extension plate (512) is embedded between the extrusion plate (73) and the mounting plate (4).

2. A metal sheet bending machine for curtain wall production according to claim 1, characterized in that: The unlocking mechanism (8) includes a pressing rod (81), the pressing rod (81) is slidably arranged in the sleeve rod (51), a protruding rod (82) is fixedly arranged at one end of the pressing rod (81), and the protruding rod (82) is vertically arranged on both sides of the pressing rod (81), and a second spring (83) is fixedly arranged between the pressing rod (81) and the through slot (52).

3. The metal sheet bending machine for curtain wall production according to claim 2, characterized in that: The sliding frame (9) is a hollow structure with openings on both sides. The upper and lower surfaces of the sliding frame (9) are provided with oblique grooves (91). The pressing rod (81) is slidably arranged in the oblique grooves (91). A release plate (92) is fixedly arranged at one end of the sliding frame (9) away from the snap buckle (10). Raised strips (921) are provided on both sides of the release plate (92).

4. The metal sheet bending machine for curtain wall production according to claim 3, characterized in that: The snap-fit ​​buckle (10) is a truncated cone structure. One end of the sliding block (5) and both ends of the central fixed block (6) are fixedly provided with a bracket (101). The snap-fit ​​buckle (10) is fixedly provided on the bracket (101). Gaps are left between the two sides of the bracket (101) and the through slot (52). The release plate (92) can be embedded in the gap.

5. The metal sheet bending machine for curtain wall production according to claim 4, characterized in that: A sliding groove (31) is provided on the connecting seat (3), the sliding block (5) is slidably arranged in the sliding groove (31), a connecting plate (32) is fixedly arranged on the connecting seat (3), a pressing plate (33) is fixedly arranged on the lifting plate (2), and the connecting plate (32) is fixedly arranged on the lifting plate (2) through the pressing plate (33).

6. The metal sheet bending machine for curtain wall production according to claim 5, characterized in that: The central fixed block (6) is fixedly arranged in the sliding groove (31), and the central fixed block (6) has the same cross section as the sliding block (5). A second through groove (61) is provided on the central fixed block (6), and the bracket (101) is fixed in the second through groove (61).

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