Bending device for producing plastic coaming box

Abstract

The utility model discloses a bending device for producing a plastic coaming box, which relates to the technical field of coaming box processing and comprises a main frame body, a plate conveying unit and a positioning and pressing unit. The pressing and folding device is provided with a reliable positioning and pressing and folding unit, an industrial camera determines the next pressing and folding position by recognizing the moving distance of an indentation on a plate, and the extending length of a pressing strip is conveniently adjusted or pressing strips with different widths are replaced by unscrewing a bolt on the side face of a lifting sliding rod so as to adjust the depth and width of a pressing and folding groove; the side edge pressing rods are arranged on the two sides of the lifting sliding rod, when the pressing strips are pressed into the plates, the plates on the two sides of the pressing line can be pressed and fixed, and the plates are prevented from being warped due to stress; the plate bending machine is further provided with the reliable plate conveying unit, the distance between the two conveying clamping frames and the height of a pressing rod can be adjusted conveniently, so that the plate bending machine adapts to plates of different widths and thicknesses, the plates can be heated in the conveying process, and follow-up pressing and bending operation is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of processing technology for plastic pallet boxes, specifically a bending device for producing plastic pallet boxes. Background Technology

[0002] Collapsible crates typically consist of three parts: a base, side panels, and a top cover. They are a type of foldable turnover box. Their assembly methods are flexible and varied, and they are easy to disassemble and load / unload, which can reduce labor costs. They can also be reused, making them an ideal choice for long-distance transportation and long-term storage. When producing the four side panels of collapsible crates, bending devices are often used to create multiple indentations at the folding points of the panels, thus facilitating bending of the side panels.

[0003] Existing bending devices for the production of plastic collapsible boxes lack a reliable conveying structure and cannot effectively convey materials of different widths and thicknesses. Furthermore, existing devices are inconvenient for changing the die to adjust the depth and width of the indentation. During bending, the material on both sides of the indentation is prone to warping, which can easily damage the material. In addition, when the material temperature is low, the material's ductility becomes inconsistent, making bending difficult. Therefore, we propose a bending device for the production of plastic collapsible boxes. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome existing defects and provide a bending device for producing plastic pallet boxes. This device features a reliable positioning and bending unit. An industrial camera identifies the movement distance of the indentation on the sheet material to determine the position for the next bending operation. Loosening the bolts on the side of the lifting slide rod allows for adjustment of the extension length of the pressure strip or replacement with pressure strips of different widths to adjust the depth and width of the bending groove. Side pressure rods are provided on both sides of the lifting slide rod to press and fix the sheet material on both sides of the pressing line when the pressure strip is pressed into the sheet, preventing the sheet from warping under pressure. It also features a reliable sheet material conveying unit, allowing for easy adjustment of the distance between the two conveyor frames to accommodate sheets of different widths. An adjustable-height pressure rod is installed inside the conveyor frame to press and limit sheets of different thicknesses, facilitating sheet material conveying. Furthermore, the sheet material can be heated during conveying, which is beneficial for subsequent bending operations. This effectively solves the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bending device for producing plastic pallet boxes, comprising a main frame, a sheet material conveying unit, and a positioning and bending unit;

[0006] Main frame: It is a horizontally arranged U-shaped structure, and a notch is opened at the upper right corner of both the front and rear sides of the main frame. A pressure-bearing platform is installed inside the right side of the main frame.

[0007] Sheet material conveying unit: installed inside the main frame on the left side;

[0008] Positioning and pressing unit: includes mounting slide rod, mounting frame one, industrial camera mounting frame two, lifting slide rod, hydraulic cylinder two, and pressure strip. A horizontal mounting slide rod is fixedly connected to the upper right corner of the main frame. Mounting frame one and mounting frame two are both longitudinally arranged, and their two ends are slidably connected to the front and rear mounting slide rods respectively. The two frames are fixed to the mounting slide rods by bolts on the upper side of their ends. The middle section of mounting frame one is lower than the middle section of mounting frame two, and an industrial camera is installed at the middle position of mounting frame one with the lens end facing downwards. Mounting frame two has a Z-shaped structure, and sliding grooves are opened on the inner side of its vertical sections on both sides. The two ends of the lifting slide rod are slidably connected to the inside of the sliding grooves. A vertical mounting groove is opened on the lower side of the lifting slide rod, and a pressure strip is inserted into the groove. The pressure strip is fixedly connected to the lifting slide rod by bolts on both sides of the lifting slide rod. Hydraulic cylinder two is installed at the middle position of the upper end of mounting frame two. The telescopic end of hydraulic cylinder two faces vertically downwards and is fixedly connected to the middle of the upper end of the lifting slide rod.

[0009] The sheet metal conveying unit can transport the sheet metal from left to right. When the sheet metal is transported to the right-side pressure platform, it is folded. The industrial camera determines the position of the next fold by identifying the movement distance of the indentation on the sheet metal. When the fold movement distance reaches the set indentation spacing, the hydraulic cylinder pushes the lifting slide rod downward. The pressure strip on the lower side of the lifting slide rod is embedded in the end face of the sheet metal, folding the sheet metal into a groove. By loosening the bolts on the side of the lifting slide rod, it is easy to adjust the length of the pressure strip extension, thereby adjusting the depth of the folding groove. Loosening the bolts also makes it easy to replace pressure strips of different widths. Mounting bracket one and mounting bracket two are slidably connected to the mounting slide rod, so it is easy to adjust the position of the industrial camera and the pressure strip. The middle section of mounting bracket two is higher than mounting bracket one, so that the folding component does not obstruct the image of the industrial camera.

[0010] Furthermore, the positioning and pressing unit also includes a support block and side pressure rods. A support block is fixedly connected to the upper right side of the main frame, and the right end of the mounting slide rod is fixedly connected inside the support block. A side pressure rod is fixedly connected to the lower edges of both sides of the lifting slide rod. The support block supports the ends of the mounting slide rod, and the side pressure rods press and fix the plate on both sides of the pressing line when the pressure strip is pressed into the plate, preventing the plate from warping under pressure.

[0011] Furthermore, the sheet material conveying unit includes conveyor brackets, connecting slide plates, linkage blocks, hydraulic cylinders, and electric rollers. Two conveyor brackets, one in front and one behind, are installed on the inner left side of the main frame. These two conveyor brackets have U-shaped openings facing each other. The bottom inner side of each conveyor bracket is flush with the upper plane of the pressure platform. Three electric rollers are equidistantly installed on the bottom inner side of each conveyor bracket. A connecting slide plate is fixedly connected to the back of each conveyor bracket, and the connecting slide plate is slidably connected to the main frame. A linkage block is fixedly connected to both sides of the outwardly extending end of the connecting slide plate. A hydraulic cylinder is installed on both sides of the outer end of the main frame, located on the connecting slide plate. The telescopic end of the hydraulic cylinder is fixedly connected to the linkage block. The conveyor brackets are used to hold the ends of the sheet material. The hydraulic cylinders can drive the connecting slide plate to slide, thereby adjusting the distance between the two conveyor brackets to accommodate sheet materials of different widths. When the electric rollers inside the conveyor brackets rotate, they can convey the sheet material.

[0012] Furthermore, the sheet metal conveying unit also includes a pressure rod, limiting slide rods, a threaded shaft, a handwheel, and a coupling. The pressure rod is installed inside the conveying bracket. A coupling is fixedly connected to the upper middle part of the pressure rod. The threaded shaft is vertically threaded to the upper middle part of the conveying bracket, and its lower end is rotatably connected to the pressure rod via the coupling. A handwheel is fixedly connected to the upper end of the threaded shaft. A vertical limiting slide rod is fixedly connected to the upper ends of both sides of the pressure rod. The limiting slide rods are slidably connected to the upper end of the conveying bracket, and a limiting block is fixedly connected to the upper end of each limiting slide rod. The pressure rod is used to limit the conveyed sheet metal from above, thereby allowing the electric roller to more effectively drag the sheet metal. The height of the pressure rod can be adjusted by rotating the handwheel to limit sheet metal of different thicknesses. The coupling maintains the rotatable connection between the threaded shaft and the pressure rod. The two limiting slide rods prevent the pressure rod from rotating, allowing it to only move up and down.

[0013] Furthermore, a hot air blower is included. The hot air blower is installed inside the main frame, close to the pressure platform, and has an air outlet on its upper side facing upwards to the left. The hot air blower applies airflow to the material to be processed, raising the temperature of the material and facilitating subsequent pressing and folding operations. The upward-facing air outlet ensures that the hot air first acts on the part of the material to be processed and continues to blow to the left, preheating the material before processing.

[0014] Furthermore, it also includes a control console. A control console is mounted on the front right side of the main frame, and a digital display screen and control buttons are installed on the upper surface of the control console. The display screen on the control console can display the operating parameters of each electrical device, and the buttons are used to control the start and stop of each electrical device.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This bending device for producing plastic pallet boxes has the following advantages:

[0016] 1. It features a reliable positioning and pressing unit. The industrial camera determines the position for the next pressing by identifying the movement distance of the indentation on the sheet metal. By loosening the bolts on the side of the lifting slide rod, it is easy to adjust the length of the pressing strip or replace the pressing strip with one of different widths to adjust the depth and width of the pressing groove. Furthermore, side pressing rods are provided on both sides of the lifting slide rod, which can press and fix the sheet metal on both sides of the pressing line when the pressing strip is pressed into the sheet metal to prevent the sheet metal from warping under force.

[0017] 2. It has a reliable sheet material conveying unit, which makes it easy to adjust the distance between the two conveying brackets to accommodate sheets of different widths. The conveying brackets are equipped with height-adjustable pressure bars, which can press and limit sheets of different thicknesses, facilitating the conveying of sheets. The sheets can also be heated during the conveying process, which is beneficial for subsequent pressing and folding operations.

[0018] 3. This utility model features a reliable positioning and pressing unit. The industrial camera determines the position for the next pressing by identifying the movement distance of the indentation on the sheet metal. By loosening the bolts on the side of the lifting slide rod, the length of the extending pressure strip can be adjusted, or pressure strips of different widths can be replaced to adjust the depth and width of the pressing groove. Side pressure rods are provided on both sides of the lifting slide rod, which can press and fix the sheet metal on both sides of the pressing line when the pressure strip is pressed into the sheet metal, preventing the sheet metal from warping under force. It also features a reliable sheet metal conveying unit, which allows for easy adjustment of the distance between the two conveying brackets to accommodate sheet metal of different widths. An adjustable pressure rod is provided inside the conveying bracket, which can press and limit sheet metal of different thicknesses, facilitating the conveying of the sheet metal. Furthermore, the sheet metal can be heated during the conveying process, which is beneficial for subsequent pressing and folding operations. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the left side structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure on the right side of this utility model;

[0022] Figure 4 This utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0023] Figure 5 This utility model Figure 1 Enlarged view of the structure at point B in the middle.

[0024] In the diagram: 1 Main frame, 2 Pressure platform, 3 Sheet conveying unit, 31 Conveying bracket, 32 Connecting slide plate, 33 Linkage block, 34 Hydraulic cylinder one, 35 Electric roller, 36 Pressure rod, 37 Limiting slide rod, 38 Threaded shaft, 39 Hand-tightening wheel, 310 Coupling, 4 Positioning and pressing unit, 41 Mounting slide rod, 42 Support block, 43 Mounting bracket one, 44 Industrial camera, 45 Mounting bracket two, 46 ​​Lifting slide rod, 47 Hydraulic cylinder two, 48 Pressure bar, 49 Side pressure rod, 5 Hot air blower, 6 Control console. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-5 This embodiment provides a technical solution: a bending device for producing plastic pallet boxes, including a main frame 1, a sheet material conveying unit 3, and a positioning and bending unit 4;

[0027] Main frame 1: It is a U-shaped structure arranged horizontally, and a notch is opened at the upper right corner of both the front and rear sides of the main frame 1. The pressure platform 2 is installed inside the right side of the main frame 1.

[0028] Sheet material conveying unit 3: installed inside the left side of the main frame 1;

[0029] Positioning and pressing unit 4: includes mounting slide rod 41, mounting bracket one 43, industrial camera 44 mounting bracket two 45, lifting slide rod 46, hydraulic cylinder two 47, and pressure bar 48. A transverse mounting slide rod 41 is fixedly connected to the upper right corner of the main frame 1. Mounting bracket one 43 and mounting bracket two 45 are both longitudinally arranged, and their ends are slidably connected to the front and rear mounting slide rods 41 respectively. The two frames are fixed to the mounting slide rods 41 by bolts on the upper side of their ends. The middle section of mounting bracket one 43 is lower than the middle section of mounting bracket two 45, and the camera is installed at the middle position of mounting bracket one 43. An industrial camera 44 is provided, with its lens facing downwards. The mounting bracket 45 has a U-shaped structure, and grooves are provided on the inner sides of its vertical sections on both sides. The two ends of the lifting slide rod 46 are slidably connected to the inside of the grooves. A vertical mounting groove is provided on the lower side of the lifting slide rod 46, and a pressure strip 48 is inserted into the groove. The pressure strip 48 is fixedly connected to the lifting slide rod 46 by bolts on both sides of the lifting slide rod 46. A hydraulic cylinder 47 is installed at the middle position of the upper end of the mounting bracket 45. The telescopic end of the hydraulic cylinder 47 faces downwards and is fixedly connected to the middle of the upper end of the lifting slide rod 46.

[0030] The sheet material conveying unit 3 can convey the sheet material from left to right. When the sheet material is conveyed to the right pressure table 2, it is pressed and folded. The industrial camera 44 determines the position of the next pressing and folding by identifying the movement distance of the indentation on the sheet material. When the movement distance of the indentation reaches the set indentation spacing, the hydraulic cylinder 47 pushes the lifting slide rod 46 to move down. The pressure strip 48 on the lower side of the lifting slide rod 46 is embedded in the end face of the sheet material, pressing and folding the sheet material into a groove. By loosening the bolts on the side of the lifting slide rod 46, it is easy to adjust the length of the pressure strip 48, thereby adjusting the depth of the pressing and folding groove. Loosening the bolts also makes it easy to replace pressure strips 48 of different widths. The mounting bracket 43 and the mounting bracket 45 are both slidably connected to the mounting slide rod 41, so it is easy to adjust the position of the industrial camera 44 and the pressure strip 48. The middle section of the mounting bracket 45 is higher than the mounting bracket 43, so that the pressing and folding components do not obstruct the imaging of the industrial camera 44.

[0031] The positioning and pressing unit 4 also includes a support block 42 and a side pressure bar 49. The support block 42 is fixedly connected to the upper right side of the main frame 1. The right end of the mounting slide rod 41 is fixedly connected to the inside of the support block 42. A side pressure bar 49 is fixedly connected to the lower edges of both sides of the lifting slide rod 46. The support block 42 is used to support the end of the mounting slide rod 41, and the side pressure bar 49 is used to press and fix the plate on both sides of the pressing line when the pressing strip 48 is pressed into the plate, to prevent the plate from warping under force.

[0032] The sheet metal conveying unit 3 includes a conveying bracket 31, a connecting slide plate 32, a linkage block 33, a hydraulic cylinder 34, and an electric roller 35. Two conveying brackets 31 are installed on the inner left side of the main frame 1. The two conveying brackets 31 are U-shaped structures with their openings facing each other. The bottom inner side of the conveying bracket 31 is flush with the upper plane of the pressure platform 2. Three electric rollers 35 are installed at equal intervals on the bottom inner side of the conveying bracket 31. The connecting slide plate 32 is fixedly connected to the back of the conveying bracket 31. The connecting slide plate 32 is slidably connected to the main frame 1. A linkage block 33 is fixedly connected to both the left and right sides of the end of the connecting slide plate 32 that extends outward. A hydraulic cylinder 34 is installed on both the left and right sides of the outer end of the main frame 1, located on the connecting slide plate 32. The telescopic end of the hydraulic cylinder 34 is fixedly connected to the linkage block 33. The conveyor bracket 31 is used to hold the end of the plate. The hydraulic cylinder 34 can drive the connecting slide plate 32 to slide, thereby adjusting the distance between the front and rear conveyor brackets 31 to accommodate plates of different widths. When the electric roller 35 inside the conveyor bracket 31 rotates, it can convey the plate.

[0033] The sheet metal conveying unit 3 also includes a pressure rod 36, a limiting slide rod 37, a threaded shaft 38, a handwheel 39, and a coupling 310. The pressure rod 36 is installed inside the conveying bracket 31. A coupling 310 is fixedly connected to the middle of the upper end of the pressure rod 36. The threaded shaft 38 is vertically threaded to the middle of the upper end of the conveying bracket 31, and its lower end is rotatably connected to the pressure rod 36 through the coupling 310. A handwheel 39 is fixedly connected to the upper end of the threaded shaft 38. A vertical limiting slide rod 37 is fixedly connected to the upper end of both sides of the pressure rod 36. The limiting slide rod 37 is slidably connected to the upper end of the conveying bracket 31, and a limiting block is fixedly connected to the upper end of the limiting slide rod 37. The pressure rod 36 is used to limit the conveyed plate from above, so that the electric roller 35 can more effectively drag the plate to move. The height of the pressure rod 36 can be adjusted by turning the handwheel 39 to limit the plate of different thicknesses. The coupling 310 is used to maintain the rotational connection between the threaded shaft 38 and the pressure rod 36. The two limit slide rods 37 can prevent the pressure rod 36 from rotating, so that it can only move up and down.

[0034] It also includes a hot air blower 5, which is installed inside the main frame 1 and close to the pressure platform 2. The hot air blower 5 has an air outlet on its upper side facing upward to the left. The hot air blower 5 blows air onto the board to be processed to increase the temperature of the board, which facilitates the subsequent pressing and folding operations. The air outlet facing upward to the left allows the hot air to first act on the part of the board to be processed, and then blows the hot air to the left, which has a preheating effect on the board to be processed.

[0035] It also includes a control console 6, which is installed on the front right side of the main frame 1. The upper surface of the control console 6 is equipped with a digital display screen and control buttons. The display screen on the control console 6 can display the operating parameters of each electrical device, and the buttons are used to control the start and stop of each electrical device.

[0036] The working principle of the bending device for producing plastic pallet boxes provided by this utility model is as follows: This device has a reliable positioning and bending unit 4. When the sheet material is conveyed to the right pressure table 2, it is bent. The industrial camera 44 determines the position of the next bending by identifying the movement distance of the indentation on the sheet material. When the movement distance of the indentation reaches the set indentation spacing, the hydraulic cylinder 47 pushes the lifting slide rod 46 to move down. The pressure strip 48 on the lower side of the lifting slide rod 46 is embedded in the end face of the sheet material, bending the sheet material into a groove. By loosening the bolts on the side of the lifting slide rod 46, it is easy to adjust the extension of the pressure strip 48. The length of the pressure strip 48 is adjusted to control the depth of the folding groove, and the pressure strip 48 of different widths can be easily replaced by loosening the bolts. Both mounting bracket 1 43 and mounting bracket 2 45 are slidably connected to the mounting slide rod 41, which facilitates the adjustment of the position of the industrial camera 44 and the pressure strip 48. The middle section of mounting bracket 2 45 is higher than mounting bracket 1 43, so that the folding component does not obstruct the imaging of the industrial camera 44. The support block 42 is used to support the end of the mounting slide rod 41, and the side pressure rod 49 is used to press and fix the plate on both sides of the pressing line when the pressure strip 48 is pressed into the plate, so as to prevent the plate from warping under force. This device also has a reliable sheet metal conveying unit 3. The conveying bracket 31 is used to clamp the end of the sheet metal. The hydraulic cylinder 34 can drive the connecting slide plate 32 to slide, thereby adjusting the distance between the front and rear conveying brackets 31 to accommodate sheets of different widths. When the electric roller 35 inside the conveying bracket 31 rotates, it can convey the sheet metal. The pressure rod 36 is used to limit the conveyed sheet metal from the top, so that the electric roller 35 can more effectively drag the sheet metal to move. And by rotating the handwheel 39, the height of the pressure rod 36 can be adjusted to limit the sheet metal of different thicknesses. The coupling 310 is used to maintain the rotational connection between the threaded shaft 38 and the pressure rod 36. The two limiting slide rods 37 can prevent the pressure rod 36 from rotating, so that it can only move up and down. In addition, the hot air blower 5 increases the temperature of the board material by blowing air, which facilitates subsequent pressing and folding operations. The air outlet facing the upper left allows the hot air to first act on the part of the board material to be processed, and then continues to blow the hot air to the left, which has a preheating effect on the subsequent board material. The display screen on the control panel 6 can display the working parameters of each electrical device, and the buttons are used to control the start and stop of each electrical device.

[0037] It is worth noting that the input terminals of the hydraulic cylinder 34, hydraulic cylinder 47, electric roller 35, industrial camera 44, and hot air blower 5 disclosed in the above embodiments are all electrically connected to the output terminal of an external power supply through the control button on the control console 6. The control console 6 controls the above electrical devices using methods commonly used in the prior art.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A bending device for producing plastic pallet boxes, characterized in that: It includes the main frame (1), the sheet material conveying unit (3), and the positioning and pressing unit (4); Main frame (1): It is a U-shaped structure arranged horizontally, and a corner is cut at the upper right corner of both the front and rear sides of the main frame (1). A pressure-bearing platform (2) is installed inside the right side of the main frame (1). Sheet material conveying unit (3): installed inside the main frame (1) on the left side; Positioning and pressing unit (4): includes mounting slide rod (41), mounting frame one (43), industrial camera (44) mounting frame two (45), lifting slide rod (46), hydraulic cylinder two (47) and pressure strip (48). The upper right corner of the main frame (1) is fixedly connected to the horizontal mounting slide rod (41). The mounting frame one (43) and the mounting frame two (45) are both arranged longitudinally, and their two ends are slidably connected to the front and rear mounting slide rods (41) respectively. The two frames are fixed to the mounting slide rods (41) by bolts on the upper side of their ends. The middle section of the mounting frame one (43) is lower than the middle section of the mounting frame two (45), and is located in the middle position of the mounting frame one (43). An industrial camera (44) is installed at the location, with the lens end of the industrial camera (44) facing downwards. The second mounting bracket (45) has a Z-shaped structure, and sliding grooves are provided on the inner side of the vertical sections on both sides. The two ends of the lifting slide rod (46) are slidably connected to the inside of the sliding grooves. A vertical mounting groove is provided on the lower side of the lifting slide rod (46), and a pressure strip (48) is inserted into the groove. The pressure strip (48) is fixedly connected to the lifting slide rod (46) by bolts on both sides of the lifting slide rod (46). A hydraulic cylinder (47) is installed at the middle position of the upper end of the second mounting bracket (45). The telescopic end of the hydraulic cylinder (47) faces downwards and is fixedly connected to the middle of the upper end of the lifting slide rod (46).

2. The bending device for producing plastic pallet boxes according to claim 1, characterized in that: The positioning and pressing unit (4) also includes a support block (42) and a side pressure rod (49). The support block (42) is fixedly connected to the upper right side of the main frame (1). The right end of the mounting slide rod (41) is fixedly connected to the inside of the support block (42). A side pressure rod (49) is fixedly connected to the lower edge of both sides of the lifting slide rod (46).

3. The bending device for producing plastic pallet boxes according to claim 1, characterized in that: The sheet metal conveying unit (3) includes a conveying bracket (31), a connecting slide plate (32), a linkage block (33), a hydraulic cylinder (34), and an electric roller (35). Two conveying brackets (31) are installed on the inner left side of the main frame (1). The two conveying brackets (31) are U-shaped structures with their openings facing each other. The bottom inner side of the conveying bracket (31) is flush with the upper plane of the pressure plate (2). Three electric rollers (35) are installed at equal intervals on the bottom inner side of the conveying bracket (31). The connecting slide plate (32) is fixedly connected to the back of the conveying bracket (31). The connecting slide plate (32) is slidably connected to the main frame (1). A linkage block (33) is fixedly connected to the left and right sides of the end of the connecting slide plate (32) that extends outward. A hydraulic cylinder (34) is installed on the left and right sides of the outer end of the main frame (1) and located on the connecting slide plate (32). The telescopic end of the hydraulic cylinder (34) is fixedly connected to the linkage block (33).

4. A bending device for producing plastic pallet boxes according to claim 3, characterized in that: The sheet metal conveying unit (3) also includes a pressure rod (36), a limiting slide rod (37), a threaded shaft (38), a handwheel (39), and a coupling (310). The pressure rod (36) is installed inside the conveying bracket (31). A coupling (310) is fixedly connected to the middle of the upper end of the pressure rod (36). The threaded shaft (38) is vertically threaded to the middle of the upper end of the conveying bracket (31), and its lower end is rotatably connected to the pressure rod (36) through the coupling (310). A handwheel (39) is fixedly connected to the upper end of the threaded shaft (38). A vertical limiting slide rod (37) is fixedly connected to the upper end of both sides of the pressure rod (36). The limiting slide rod (37) is slidably connected to the upper end of the conveying bracket (31), and a limiting block is fixedly connected to the upper end of the limiting slide rod (37).

5. A bending device for producing plastic pallet boxes according to claim 1, characterized in that: It also includes a hot air blower (5), which is installed inside the main frame (1) and close to the pressure plate (2). The hot air blower (5) has an air outlet on its upper side facing the upper left.

6. A bending device for producing plastic pallet boxes according to claim 1, characterized in that: It also includes a console (6), which is installed on the right side of the front end of the main frame (1). The upper surface of the console (6) is equipped with a digital display screen and control buttons.

Images