Metal building material bending device

Abstract

The present invention relates to the technical field of metal bending, and discloses a metal building material bending device, including a base plate, and also including: a U-shaped frame, which is fixedly installed on the top of the base plate; a placing component, which is arranged on the top of the base plate; a bending component, which is arranged on the horizontal side of the U-shaped frame; a temperature measurement unlocking component, which is arranged on the top of the base plate; and a cooling component, which is arranged on the bending component. The present invention can automatically detect the temperature of the metal building material to be bent. When the temperature of the metal building material does not reach the specified temperature, the pressing block will not drop, thereby avoiding the situation that the metal building material is broken due to insufficient temperature when bending brittle metal plates such as high-carbon steel sheets. Only when the temperature of the metal building material reaches the specified temperature, the U-shaped block moves to release the limit on the first spring rod through the extension tube, and the metal building material can be bent at this time, thereby solving the problem of the metal building material breaking after bending, thereby improving the use effect of the device.

Description

Technical Field

[0001] The invention relates to the technical field of metal bending, and in particular to a metal building material bending device. Background Art

[0002] Metal building materials are widely used in the construction field. Their characteristics include durability, plasticity, corrosion resistance and design flexibility, such as high-carbon steel sheets. In the building materials industry, various metal plates and other products are often used. When metal plates are manufactured, they are often bent and pressed.

[0003] For example, the patent with announcement number CN210547263U discloses an automatic bending and edge pressing device for building materials. Although it can bend metals for metal detection, it does not have the function of heating and measuring the temperature of brittle metals such as high-carbon steel sheets during bending. This will cause the high-carbon steel sheets and other metals to break during the bending process when the temperature is low, reducing the bending effect. Therefore, there is an urgent need to design a metal building material bending device. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a metal building material bending device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A metal building material bending device comprises a bottom plate and also comprises:

[0007] U-shaped frame, the U-shaped frame is fixedly installed on the top of the bottom plate;

[0008] Hot air blower, which is installed at the bottom of the horizontal side of the U-shaped frame. The hot air blower is used to heat metal building materials;

[0009] A placement component is arranged on the top of the base plate and is used for placing metal building materials;

[0010] Bending assembly, the bending assembly is arranged on the horizontal side of the U-shaped frame, and the bending assembly is used to bend metal building materials;

[0011] A temperature measuring and unlocking component is arranged on the top of the base plate and is used to detect the temperature of metal building materials;

[0012] A cooling component is arranged on the bending component and is used to cool the metal building material after bending.

[0013] As a further technical solution of the present invention, the placement component includes: a U-shaped plate, the U-shaped plate is fixedly installed on the top of the base plate, a horizontal plate of the same height is slidably arranged on the side of the U-shaped plate, second spring rods are vertically fixedly installed at the four corners of the bottom of the horizontal plate, the output shafts of the four second spring rods are fixedly installed on the top of the base plate, and two symmetrically arranged U-shaped limit strips are fixedly installed on the horizontal side and the top of the horizontal plate of the U-shaped plate.

[0014] As a further technical solution of the present invention, the bending assembly includes: a pressure block, which is horizontally arranged below the horizontal side of the U-shaped frame, a first spring rod is vertically fixedly installed on the top of the pressure block, the fixed end and the telescopic end of the first spring rod are slidably connected by a spline, a hydraulic telescopic rod is vertically installed on the top of the horizontal side of the U-shaped frame, the output shaft of the hydraulic telescopic rod passes through the horizontal side of the U-shaped frame and is fixedly installed on the top of the fixed end of the first spring rod, and an extension plate is horizontally fixedly installed on the surface of the telescopic end of the first spring rod.

[0015] As a further technical solution of the present invention, the temperature measurement and unlocking component includes: a connecting box, which is vertically fixed on the top of the base plate, and a heat conducting plate is horizontally fixed on the bottom of the horizontal plate, the top of the heat conducting plate is abutted against the bottom of the horizontal side of the U-shaped plate, the inside of the heat conducting plate is hollow, and a connecting pipe is installed on the outside of the heat conducting plate, and the end of the connecting pipe away from the heat conducting plate is connected and installed on the connecting box, and mercury is provided inside the connecting pipe and the heat conducting plate.

[0016] As a further technical solution of the present invention, a second piston plate is slidably arranged inside the connecting box, a strip column is vertically fixedly installed on the top of the second piston plate, a third spring is sleeved on the surface of the strip column, two ends of the third spring are respectively fixedly installed on the top of the second piston plate and the top of the connecting box, the top of the strip column passes through the top of the connecting box, the surface of the strip column is slidably arranged in the top surface of the connecting box, and a second movable rod is rotatably installed on the side of the top end of the strip column.

[0017] As a further technical solution of the present invention, a slide is also horizontally fixedly installed on the top of the base plate, a skateboard is slidably installed inside the slide, a U-shaped block is horizontally fixedly installed on the top of the skateboard, a plurality of rollers evenly distributed in a straight line are rotatably installed between the two horizontal sides of the U-shaped block, and the rollers are rollingly arranged between the rollers and the extension plate, and the end of the second movable rod away from the strip column is fixedly installed on the top of the U-shaped block.

[0018] As a further technical solution of the present invention, the cooling component includes: an air box, which is fixedly installed on the top of the pressure block, a first piston plate is slidably arranged inside the air box, a movable plate is fixedly installed at the center of the side of the first piston plate, the top of the movable plate passes through the air box, the surface of the movable plate is slidably arranged on the inner wall of the air box, and a first movable rod is rotatably installed on the top of the movable plate.

[0019] As a further technical solution of the present invention, a support plate is vertically fixedly installed on the top of the pressure block, a turntable is rotatably installed on the side of the support plate, the end of the first movable rod away from the movable plate is rotatably installed on the outer edge of the side of the turntable, a rotating rod is horizontally rotatably installed on the side of the support plate away from the turntable, the rotating rod is fixedly installed at the center of the side of the turntable through a connecting shaft, a one-way bearing is fixedly installed on the end of the rotating rod away from the support plate, a gear is fixedly sleeved on the outer ring of the one-way bearing, and a rack meshing with the gear is vertically fixedly installed on the bottom of the horizontal side of the U-shaped frame.

[0020] As a further technical solution of the present invention, an outlet pipe is installed on the surface of the air box, a second one-way valve is installed on the surface of the outlet pipe, an inlet pipe is installed on the surface of the air box, an end of the inlet pipe passes through the top of the air box and the first piston plate, the surface of the inlet pipe is slidably arranged inside the first piston plate, and a first one-way valve is installed on the surface of the inlet pipe.

[0021] The beneficial effects of the present invention are:

[0022] Firstly, the present invention can automatically detect the temperature of the metal building material to be bent when in use by setting the placement component, the bending component and the temperature measurement and unlocking component. When the temperature of the metal building material does not reach the specified temperature, the pressing block will not drop, thus avoiding the metal building material from being broken due to insufficient temperature when bending brittle metal plates such as high-carbon steel sheets. Only when the temperature of the metal building material reaches the specified temperature, the U-shaped block will move to release the limit of the first spring rod through the extension tube, and the metal building material can be bent at this time, thus solving the problem of the metal building material breaking when being bent, thereby improving the use effect of the device.

[0023] Secondly, the present invention, through the setting of the bending component, the cooling component and the temperature measuring and unlocking component, can blow air to cool the bent metal building materials after they are bent. This can not only enable the U-shaped block and the roller to be quickly reset, but also cool the bent metal building materials, making it convenient for the staff to take and replace the metal building materials, thereby improving the ease of use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a metal building material bending device proposed by the present invention;

[0025] Figure 2 This is a bottom view structural diagram of a U-shaped frame of a metal building material bending device proposed by the present invention;

[0026] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0027] Figure 4 This is a schematic structural diagram of a metal building material bending device proposed by the present invention after removing the U-shaped frame;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of part B;

[0029] Figure 6 This is a schematic cross-sectional structure diagram of a connecting box of a metal building material bending device proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the meteorological cross-sectional structure of a metal building material bending device proposed by the present invention.

[0031] In the figure: 1, bottom plate; 2, U-shaped frame; 3, hydraulic telescopic rod; 4, U-shaped plate; 5, cross plate; 6, U-shaped limit strip; 7, pressure block; 8, air box; 9, extension plate; 10, connecting box; 11, strip column; 12, heat conduction plate; 13, second spring rod; 14, rack; 15, one-way bearing; 16, gear; 17, air inlet pipe; 18, first one-way valve; 19, air outlet pipe; 20, second one-way valve; 21, first spring rod; 22, slideway; 23, slide plate; 24, moving plate; 25, first movable rod; 26, turntable; 27, rotating rod; 28, U-shaped block; 29, roller; 30, second movable rod; 31, second piston plate; 32, third spring; 33, first piston plate; 34, connecting pipe; 35, hot air blower. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Please refer to the attached Figure 1 -Attached Figure 7 A metal building material bending device comprises a bottom plate 1, and also comprises: a U-shaped frame 2, a hot air blower 35, a placement component, a bending component, a temperature measurement unlocking component and a cooling component, wherein the U-shaped frame 2 is fixedly mounted on the top of the bottom plate 1, the hot air blower 35 is mounted on the bottom of the horizontal side of the U-shaped frame 2, the hot air blower 35 is used to heat the metal building material, the placement component is arranged on the top of the bottom plate 1, the placement component is used to place the metal building material, the bending component is arranged on the horizontal side of the U-shaped frame 2, the bending component is used to bend the metal building material, the temperature measurement unlocking component is arranged on the top of the bottom plate 1, the temperature measurement unlocking component is used to detect the temperature of the metal building material, the cooling component is arranged on the bending component, and the cooling component is used to cool the metal building material after bending;

[0035] As described above, when in use, the temperature of the metal building material to be bent can be automatically detected. When the temperature of the metal building material does not reach the specified temperature, the pressing block 7 will not drop, thereby avoiding the situation where the metal building material breaks due to insufficient temperature when bending brittle metal plates such as high-carbon steel sheets.

[0036] Please refer to the attached Figure 1 -Attached Figure 4 In a preferred embodiment, the placement assembly includes: a U-shaped plate 4, the U-shaped plate 4 is fixedly mounted on the top of the bottom plate 1, a horizontal plate 5 of equal height is slidably arranged on the side of the U-shaped plate 4, a second spring rod 13 is vertically fixedly mounted at the four corners of the bottom of the horizontal plate 5, the output shafts of the four second spring rods 13 are fixedly mounted on the top of the bottom plate 1, and two symmetrically arranged U-shaped limit strips 6 are fixedly mounted on the horizontal side of the U-shaped plate 4 and the top of the horizontal plate 5;

[0037] Specifically, the metal building material to be bent is placed between two U-shaped limiting strips 6 to limit the position of the metal building material.

[0038] Please refer to the attached Figure 2 -Attached Figure 7 In a preferred embodiment, the bending assembly includes: a pressing block 7, the pressing block 7 is horizontally arranged below the horizontal side of the U-shaped frame 2, a first spring rod 21 is vertically fixedly installed on the top of the pressing block 7, the fixed end and the telescopic end of the first spring rod 21 are slidably connected by a spline, a hydraulic telescopic rod 3 is vertically installed on the top of the horizontal side of the U-shaped frame 2, the output shaft of the hydraulic telescopic rod 3 passes through the horizontal side of the U-shaped frame 2 and is fixedly installed on the top of the fixed end of the first spring rod 21, and an extension plate 9 is horizontally fixedly installed on the telescopic end surface of the first spring rod 21;

[0039] Furthermore, the elastic force generated by the first spring rod 21 causes the telescopic end of the first spring rod 21 and the pressing block 7 to move downward rapidly, thereby achieving bending of the metal building material.

[0040] Please refer to the attached Figure 1 -Attached Figure 7In a preferred embodiment, the temperature measurement and unlocking component includes: a connecting box 10, the connecting box 10 is vertically fixedly installed on the top of the bottom plate 1, and a heat conducting plate 12 is horizontally fixedly installed on the bottom of the horizontal plate 5. The top of the heat conducting plate 12 is abutted against the bottom of the horizontal side of the U-shaped plate 4. The inside of the heat conducting plate 12 is hollow, and a connecting pipe 34 is installed on the outside of the heat conducting plate 12. The end of the connecting pipe 34 away from the heat conducting plate 12 is connected and installed on the connecting box 10. Mercury is arranged inside the connecting pipe 34 and the heat conducting plate 12. A second piston plate 31 is slidably arranged inside the connecting box 10, and a strip column 11 is vertically fixedly installed on the top of the second piston plate 31. A third spring 32 is sleeved on the surface of the strip column 11. The third spring The two ends of 32 are respectively fixedly installed on the top of the second piston plate 31 and the top of the connecting box 10, the top of the strip column 11 passes through the top of the connecting box 10, the surface of the strip column 11 is slidably set in the top surface of the connecting box 10, and the second movable rod 30 is rotatably installed on the side of the top of the strip column 11. The top of the bottom plate 1 is also horizontally fixedly installed with a slideway 22, and a slide plate 23 is slidably installed inside the slideway 22. A U-shaped block 28 is horizontally fixedly installed on the top of the slide plate 23. A plurality of rollers 29 evenly distributed in a straight line are rotatably installed between the two horizontal sides of the U-shaped block 28. The rollers 29 and the extension plate 9 are rollingly set, and the end of the second movable rod 30 away from the strip column 11 is fixedly installed on the top of the U-shaped block 28;

[0041] Preferably, the mercury inside the heat conducting plate 12 will expand due to heat and push the second piston plate 31 upward, and the movement of the U-shaped block 28 drives the roller 29 to move. When the roller 29 and the extension plate 9 are separated, the U-shaped block 28 and the roller 29 will no longer hinder the extension plate 9.

[0042] Please see attached Figure 1 -Attached Figure 7In a preferred embodiment, the cooling component includes: an air box 8, the air box 8 is fixedly installed on the top of the pressure block 7, a first piston plate 33 is slidably arranged inside the air box 8, a movable plate 24 is fixedly installed at the center of the side of the first piston plate 33, the top of the movable plate 24 passes through the air box 8, the surface of the movable plate 24 is slidably arranged in the inner wall of the air box 8, a first movable rod 25 is rotatably installed on the top of the movable plate 24, a support plate is vertically fixedly installed on the top of the pressure block 7, a turntable 26 is rotatably installed on the side of the support plate, the end of the first movable rod 25 away from the movable plate 24 is rotatably installed on the outer edge of the side of the turntable 26, and the side of the support plate away from the turntable 26 is horizontally rotatably installed The rotating rod 27 is fixedly installed at the center of the side of the rotating disk 26 through a connecting shaft. The end of the rotating rod 27 away from the support plate is fixedly installed with a one-way bearing 15, and the outer ring of the one-way bearing 15 is fixedly sleeved with a gear 16. The bottom of the horizontal side of the U-shaped frame 2 is vertically fixedly installed with a rack 14 meshing with the gear 16. The surface of the air box 8 is connected to the air outlet pipe 19, and the surface of the air outlet pipe 19 is installed with a second one-way valve 20. The surface of the air box 8 is connected to the air inlet pipe 17, and the end of the air inlet pipe 17 passes through the top of the air box 8 and the first piston plate 33. The surface of the air inlet pipe 17 is slidably arranged inside the first piston plate 33, and the surface of the air inlet pipe 17 is installed with a first one-way valve 18;

[0043] Furthermore, the air outlet pipe 19 can be used to blow air to the metal building material, thereby accelerating the air flow around the metal building material, thereby achieving cooling of the bent metal building material.

[0044] The working principle of the present invention is as follows: first, the metal building material to be bent is placed between the two U-shaped limit bars 6, and then the first spring rod 21 is driven to move by the hydraulic telescopic rod 3, and the movement of the first spring rod 21 drives the pressing block 7 to move downward (at this time, when the gear 16 follows the pressing block 7 to move downward, the gear 16 will not drive the rotating rod 27 to rotate through the one-way bearing 15), and at the same time, the hot air blower 35 is turned on to heat the placed metal building material, and the downward movement of the first spring rod 21 will synchronously drive the extension plate 9 to move downward, and the downward movement of the extension plate 9 will contact the roller 29, and the roller 29 will hinder the downward movement of the extension plate 9, the telescopic end of the first spring rod 21 and the pressing block 7, and make the first spring rod 21 generate elastic force;

[0045] As the hot air blower 35 heats the metal building material, the mercury inside the heat conducting plate 12 will expand due to the heat, pushing the second piston plate 31 to move upward, the second piston plate 31 moves upward, driving the bar column 11 to move upward and causing the third spring 32 to generate elastic force, the bar column 11 moves upward, driving the second movable rod 30 to move, the second movable rod 30 moves to drive the U-shaped block 28 to move, the U-shaped block 28 moves to drive the roller 29 to move (the setting of the slideway 22 and the slide plate 23 ensures the stability of the U-shaped block 28 when moving), when the roller 29 and the extension plate 9 are separated (when the high carbon steel sheet is heated to 500°C-650°C), the U-shaped block 28 and the roller 29 will no longer hinder the extension plate 9, then the elastic force generated by the first spring rod 21 will cause the telescopic end of the first spring rod 21 and the pressing block 7 to move downward rapidly, thereby realizing the bending of the metal building material;

[0046] Then, the first spring rod 21 is driven upward by the hydraulic telescopic rod 3, and the first spring rod 21 drives the pressure block 7 and the connecting assembly thereon to move upward. Due to the setting of the rack 14, the gear 16 will rotate in the opposite direction when it moves upward, and the rotation of the gear 16 drives the one-way bearing 15 to rotate, and the rotation of the one-way bearing 15 drives the rotating rod 27 to rotate, and the rotation of the rotating rod 27 drives the rotating disk 26 to rotate, and the rotation of the rotating disk 26 drives the first movable rod 25 to move, and the movement of the first movable rod 25 drives the movable plate 24 to reciprocate, and the movement of the movable plate 24 drives The first piston plate 33 moves back and forth. When the first piston plate 33 moves toward the direction close to the air outlet pipe 19, the first one-way valve 18 is in a closed state, and the second one-way valve 20 is in an open state. When the first piston plate 33 moves toward the direction close to the air inlet pipe 17, the first one-way valve 18 is in an open state, and the second one-way valve 20 is in a closed state. The reciprocating motion in sequence can make the air outlet pipe 19 spray air to the metal building material, thereby accelerating the air flow around the metal building material, and realizing the cooling of the bent metal building material.

[0047] Finally, when the extension plate 9 moves to above the U-shaped block 28, the work is stopped to complete the bending of the metal building material. In summary, the metal building material can be bent continuously by reciprocating in sequence, thereby improving the bending stability of the equipment for the metal building material.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A metal building material bending device, comprising a base plate (1), characterized in that: Also includes: A U-shaped frame (2), wherein the U-shaped frame (2) is fixedly mounted on the top of the base plate (1); A hot air blower (35), the hot air blower (35) being installed at the bottom of the horizontal side of the U-shaped frame (2), and the hot air blower (35) being used to heat the metal building material; A placement component, the placement component is arranged on the top of the base plate (1), and the placement component is used to place metal building materials; A bending assembly, the bending assembly being arranged on a horizontal side of the U-shaped frame (2), and being used for bending metal building materials; A temperature measuring and unlocking component, the temperature measuring and unlocking component is arranged on the top of the base plate (1), and the temperature measuring and unlocking component is used to detect the temperature of the metal building material; A cooling component, which is arranged on the bending component and is used to cool the metal building material after bending; The placement component comprises: a U-shaped plate (4), the U-shaped plate (4) being fixedly mounted on the top of the base plate (1), a horizontal plate (5) of the same height being slidably mounted on the side of the U-shaped plate (4), second spring rods (13) being vertically fixedly mounted on the four corners of the bottom of the horizontal plate (5), the output shafts of the four second spring rods (13) being fixedly mounted on the top of the base plate (1), two symmetrically arranged U-shaped limit strips (6) being fixedly mounted on the horizontal side of the U-shaped plate (4) and the top of the horizontal plate (5), and the bending component comprises: a pressing block (7), the pressing block (7) being horizontally arranged below the horizontal side of the U-shaped frame (2), the top of the pressing block (7) being vertically fixedly mounted with a first spring rod (21), the first spring rod (21) being vertically fixedly mounted on the top of the first spring rod (21), the second ... The fixed end and telescopic end of a spring rod (21) are slidably connected via a spline, a hydraulic telescopic rod (3) is vertically mounted on the top of the horizontal side of the U-shaped frame (2), an output shaft of the hydraulic telescopic rod (3) passes through the horizontal side of the U-shaped frame (2) and is fixedly mounted on the top of the fixed end of the first spring rod (21), an extension plate (9) is horizontally fixedly mounted on the surface of the telescopic end of the first spring rod (21), the temperature measurement unlocking component comprises: a connecting box (10), the connecting box (10) is vertically fixedly mounted on the top of the bottom plate (1), a heat conducting plate (12) is horizontally fixedly mounted on the bottom of the horizontal plate (5), the top of the heat conducting plate (12) abuts against the bottom of the horizontal side of the U-shaped plate (4), the heat conducting plate (12) ) is hollow inside, a connecting pipe (34) is installed on the outside of the heat conducting plate (12), the end of the connecting pipe (34) away from the heat conducting plate (12) is connected and installed on the connecting box (10), mercury is provided inside the connecting pipe (34) and the heat conducting plate (12), a second piston plate (31) is slidably arranged inside the connecting box (10), a strip column (11) is vertically fixedly installed on the top of the second piston plate (31), a third spring (32) is sleeved on the surface of the strip column (11), two ends of the third spring (32) are respectively fixedly installed on the top of the second piston plate (31) and the top of the connecting box (10), the top of the strip column (11) passes through the connecting box (1 0), the surface of the strip column (11) is slidably arranged in the top surface of the connecting box (10), a second movable rod (30) is rotatably installed on the side of the top of the strip column (11), a slideway (22) is also horizontally fixedly installed on the top of the bottom plate (1), a slide plate (23) is slidably installed inside the slideway (22), a U-shaped block (28) is horizontally fixedly installed on the top of the slide plate (23), a plurality of rollers (29) evenly distributed in a straight line are rotatably installed between the two horizontal sides of the U-shaped block (28), the rollers (29) and the extension plate (9) are rollingly arranged, and the end of the second movable rod (30) away from the strip column (11) is fixedly installed on the top of the U-shaped block (28).

2. A metal building material bending device according to claim 1, characterized in that: The cooling component comprises: an air box (8), the air box (8) is fixedly mounted on the top of the pressure block (7), a first piston plate (33) is slidably mounted inside the air box (8), a movable plate (24) is fixedly mounted at the center of the side of the first piston plate (33), the top end of the movable plate (24) passes through the air box (8), the surface of the movable plate (24) is slidably mounted on the inner wall of the air box (8), and a first movable rod (25) is rotatably mounted on the top end of the movable plate (24).

3. A metal building material bending device according to claim 2, characterized in that: A support plate is vertically fixedly installed on the top of the pressure block (7), and a turntable (26) is rotatably installed on the side of the support plate. The end of the first movable rod (25) away from the movable plate (24) is rotatably installed on the outer edge of the side of the turntable (26). A rotating rod (27) is horizontally rotatably installed on the side of the support plate away from the turntable (26). The rotating rod (27) is fixedly installed at the center of the side of the turntable (26) through a connecting shaft. A one-way bearing (15) is fixedly installed on the end of the rotating rod (27) away from the support plate, and a gear (16) is fixedly sleeved on the outer ring of the one-way bearing (15). A rack (14) meshing with the gear (16) is vertically fixedly installed on the bottom of the horizontal side of the U-shaped frame (2).

4. A metal building material bending device according to claim 3, characterized in that: The surface of the air box (8) is connected to an air outlet pipe (19), and a second one-way valve (20) is installed on the surface of the air outlet pipe (19). The surface of the air box (8) is connected to an air inlet pipe (17), and the end of the air inlet pipe (17) passes through the top of the air box (8) and the first piston plate (33). The surface of the air inlet pipe (17) is slidably arranged inside the first piston plate (33), and the surface of the air inlet pipe (17) is installed with a first one-way valve (18).

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