A double-sided turning machine for sheet materials

Abstract

The present invention discloses a double-sided plate turning machine, which comprises a frame, a conveying device, a bending device and a linear module; the conveying device comprises a conveying belt line and a conveying belt line bracket, the conveying device is fixed in the middle of the frame, and a pressing device is arranged on the conveying device; the linear module comprises a linear slide rail and a lead screw assembly, and the linear module is arranged between the bending device and the frame; the bending device comprises a bending frame body, a pressing die, a turning die and a lifting module, the pressing die and the turning die are movably connected to the upper and lower parts of the bending frame body, the pressing die slides up and down in the bending frame body, and the turning die can rotate in the bending frame body; the lifting module is arranged between the bending frame body and the linear module. The present invention uses two movable bending devices to perform multiple bendings on both ends of the plate, saving time and effort. The present invention can be applied to the field of mechanical processing.

Description

Technical Field

[0001] The present invention relates to the field of machining, and particularly to a double-sided plate turning machine for plates. Background Art

[0002] In the prior art, when using a bending machine to bend both ends of a metal plate, generally, one end of the metal plate is first bent, and then the other end to be bent is manually rotated to the bending machine for bending again to achieve the effect of double-sided bending. When the double-sided bending of the plate is required, especially when multiple bends are required on both sides, the traditional bending machine has a slow processing speed, is time-consuming and laborious, and has no advantage in processing production. Summary of the Invention

[0003] The object of the present invention is to provide a double-sided plate turning machine for plates to solve one or more technical problems existing in the prior art, and at least provide a beneficial alternative or create conditions.

[0004] The technical solution adopted to solve the above technical problems:

[0005] A double-sided plate turning machine for plates, comprising:

[0006] A frame;

[0007] A conveying device, the conveying device is arranged in the middle of the frame, the conveying device includes a conveying belt line and a conveying belt line support, the conveying belt line support is arranged between the conveying belt line and the frame, and the conveying belt line support is fixedly connected to the conveying belt line and the frame;

[0008] Two bending devices, the two bending devices are respectively arranged at the front and rear of the frame, and each bending device includes: a bending frame body, a pressing die and a flipping die, the pressing plate and the flipping die are arranged in the bending frame body; the pressing die includes a pressing plate and a pressing hydraulic cylinder, a pressing portion is arranged at the lower end of the pressing plate, the pressing hydraulic cylinder is arranged on the bending frame body, and the output shaft of the pressing hydraulic cylinder is connected to the pressing plate; the flipping die includes a flipping block and a rotating oil cylinder, a folding portion is arranged in the middle of the flipping block, the rotating oil cylinder is fixed on the bending frame body, and the output shaft of the rotating oil cylinder is fixedly connected to the flipping block;

[0009] A linear module, the linear module is arranged between the bending device and the frame, the linear module includes a linear slide rail and a lead screw assembly, the bending frame body is installed on the frame through the linear slide rail, and the bending frame body moves on the frame through the lead screw assembly and the linear slide rail.

[0010] The beneficial effects of the present invention are as follows: The bending frame body provides a basic support for the actions of the pressing die and the flipping die. The bending process of the sheet is completed by the lifting of the pressing die and the flipping of the flipping die. After the sheet is pressed, it is then pressed and flipped, making the bending process smooth and fast. Two bending devices can simultaneously perform bending processing on both ends of the sheet. The linear module enables the distance between the two bending devices to be adjustable, which can adapt to different bending requirements and can also perform multiple bends on the sheet. The conveying device facilitates the movement of the sheet, making the bending and feeding process of the sheet safer, time-saving, and labor-saving.

[0011] As a further improvement of the above technical solution, the bending frame body includes a left vertical plate, a right vertical plate, an upper fixing member, and a lower fixing member. The left vertical plate, the right vertical plate, the upper fixing member, and the lower fixing member are respectively arranged at the left end, the right end, the upper end, and the lower end of the bending frame body. The left vertical plate, the right vertical plate, the upper fixing member, and the lower fixing member are welded together to form a long rectangular frame. There are two rotary cylinders, and the two rotary cylinders are respectively fixed on the left vertical plate and the right vertical plate. The bending frame body is welded by various parts, providing support and fixation for the actions of the pressing die and the flipping die inside it. The flipping die is arranged between the left vertical plate and the right vertical plate for flipping, and the rotary cylinders on both sides are anti-sway mounted and fixed on the left vertical plate and the right vertical plate.

[0012] As a further improvement of the above technical solution, opposite sliding grooves are provided on the inner sides of the left vertical plate and the right vertical plate. The left and right ends of the pressing die are respectively arranged in the sliding grooves and slide up and down reciprocally along the sliding grooves. The pressing die slides up and down in the bending frame body through cooperation with the sliding grooves, and the actions of the pressing die are guided and restricted by the sliding grooves.

[0013] As a further improvement of the above technical solution, the pressing die is also provided with a balance shaft. The balance shaft is arranged on one side of the pressing plate. The balance shaft is a round shaft, and bearing supports are provided at both ends of the balance shaft. The two ends of the balance shaft are respectively movably connected to the left vertical plate and the right vertical plate through the bearing supports. Two gears are provided on the balance shaft, and corresponding racks are provided on the pressing plate. The gears and the racks are meshed. The pressing plate slides up and down in the bending frame body, and the gears of the balance rod cooperate with the racks of the pressing plate, making the pressing plate and the balance shaft keep parallel, and making the up and down sliding of the pressing plate smoother and more stable.

[0014] As a further improvement of the above technical solution, the flipping block is provided with a connecting section and a flipping plate. There are two connecting sections, and the two connecting sections are respectively fixedly connected to both sides of the flipping plate. The output shaft of the rotary cylinder is fixedly connected to the corresponding connecting section. Due to the need for bending, the flipping block is relatively large in volume. The flipping block is connected by the connecting section and the flipping plate, which is beneficial to the manufacturing and processing of each part and saves costs.

[0015] As a further improvement of the above technical solution, there are two linear sliding rails. The linear sliding rails include guide rails and sliders. The guide rails are installed on the left and right sides of the frame, and the sliders are installed at corresponding positions at the bottom of the bending frame body. The guide rails and the sliders are slidably connected. The lead screw assembly includes a lead screw, a lead screw nut, a fixed seat, a support and a servo motor. The fixed seat and the support are fixed on the frame. The lead screw is arranged between the fixed seat and the support. The servo motor is connected to the lead screw through a coupling. The lead screw nut is threadedly connected to the lead screw, and the lead screw nut is fixedly connected to the bottom of the bending frame body. By means of the linear module, the friction between the bending device and the frame is reduced, so that the bending device can move on the frame. The lead screw assembly provides power for the movement of the bending device, which is convenient for controlling and positioning the movement of the bending device.

[0016] As a further improvement of the above technical solution, the bending device further includes a lifting module. The lifting module is arranged between the bending frame body and the linear module. The lifting module is composed of a support plate, linear bearings, cylindrical shafts and a lifting hydraulic cylinder. The bending frame body and the linear module are slidably connected in the vertical direction through the linear bearings and the cylindrical shafts. By means of the lifting module, the height of the bending device is changed, so that the heights of the pressing die and the flipping die of the bending device can be changed. During the process of sheet conveying and the movement of the bending device, the height of the bending device is lowered through the lifting module to avoid contacting the sheet and affecting the positioning. When bending is required, the bending device is raised to the working position again, making the bending action more reliable and having higher adaptability and practicability.

[0017] As a further improvement of the above technical solution, there are four linear bearings and four cylindrical shafts respectively. The linear bearings are evenly distributed and fixed on the support plate. The cylindrical shafts are fixed to the bottom of the lower fixing part. The linear bearings are sleeved on the cylindrical shafts. The lifting hydraulic cylinder is fixed in the middle of the lower fixing part. The output shaft of the lifting hydraulic cylinder is connected to the support plate. The cooperation of the four linear bearings and the four cylindrical shafts enables the bending device to lift smoothly, and the lifting hydraulic cylinder provides power for the lifting.

[0018] As a further improvement of the above technical solution, there are also a feeding belt line and a discharging belt line. The feeding belt line, the discharging belt line and the conveying belt line have the same conveying direction. The feeding belt line is arranged in front of the conveying belt line, and the discharging belt line is arranged behind the conveying belt line. The feeding belt line and the discharging belt line are respectively docked in front of and behind the two bending devices, making the conveying of the sheet more relaxed and flexible and reducing the working intensity of sheet loading and unloading.

[0019] As a further improvement of the above technical solution, a pressing device is provided on the conveying belt line, and the pressing device presses the plate on the conveying belt line through the actions of its components. By pressing the plate on the conveying belt line with the pressing device, the bending quality will not be affected by deviation during the bending process. Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments;

[0021] Figure 1 is a three-dimensional schematic diagram of one embodiment of the double-sided plate turning machine provided by the present invention;

[0022] Figure 2 is a side view of one embodiment of the double-sided plate turning machine provided by the present invention;

[0023] Figure 3 is a front view of the state where the bending device is installed on the frame;

[0024] Figure 4 is a top view of the state where the linear module is installed on the frame;

[0025] Figure 5 is a three-dimensional schematic diagram of the balance shaft provided by the present invention.

[0026] 100, frame; 200, conveying device; 300, bending device; 400, linear module; 500, feeding belt line; 600, discharging belt line; 210, conveying belt line; 220, conveying belt line bracket; 310, bending frame body; 320, pressing die; 330, turning die; 340, lifting module; 410, linear slide rail; 420, lead screw assembly; 311, left vertical plate; 312, right vertical plate; 313, upper fixing part; 314, lower fixing part; 315, chute; 321, pressing plate; 322, pressing hydraulic cylinder; 323, balance shaft; 331, turning block; 332, rotating hydraulic cylinder; 333, turning plate; 334, connecting section; 341, support plate; 342, linear bearing; 343, cylindrical shaft; 344, lifting hydraulic cylinder; 421, lead screw; 422, lead screw nut; 423, fixing seat; 424, support; 425, servo motor. Detailed Description of the Invention

[0027] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation on the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that for the orientation descriptions, such as the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc., they are based on the orientations or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, if there are descriptions with words such as "several", its meaning is one or more, and the meaning of "multiple" is more than two. Understandings such as "greater than", "less than", "exceeding", etc. do not include the base number, and understandings such as "above", "below", "within", etc. include the base number.

[0030] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0031] Referring to Figures 1 to 5 , the following embodiments can be made for the double-sided turning machine of the sheet material of the present invention:

[0032] A double-sided turning machine for plates, with a frame 100 provided at its bottom. The frame 100 is assembled and welded by square tubes into a cuboid shape, and four corner parts of the frame 100 are all provided with floor feet. Above the middle part of the frame 100, a conveying belt line bracket 220 is fixedly connected, and a conveying belt line 210 is fixedly connected to the conveying belt line bracket 220. The conveying belt line 210 is arranged in the front-rear direction. Linear modules 400 are installed at the front and rear parts of the frame 100 respectively. The linear module 400 includes a linear slide rail 410 and a lead screw assembly 420. The linear slide rail 410 is installed on both sides of the upper part of the frame 100. The lead screw assembly 420 includes a lead screw 421, a lead screw nut 422, a fixed seat 423, a support 424 and a servo motor 425. The fixed seat 423 and the support 424 are fixed to the frame 100. The lead screw 421 is arranged between the fixed seat 423 and the support 424. The servo motor 425 is connected to the lead screw 421 through a coupling. The lead screw nut 422 is threadedly connected to the lead screw 421, and the lead screw nut 422 is fixedly connected to the bottom of the bending device 300. There are two bending devices 300, which are respectively arranged on the linear modules 400 above the front and rear parts of the frame 100. The bending device 300 includes a bending frame body 310, a pressing die 320 and a turning die 330. The bending frame body 310 is composed of a left vertical plate 311, a right vertical plate 312, an upper fixing part 313 and a lower fixing part 314. The left vertical plate 311, the right vertical plate 312, the upper fixing part 313 and the lower fixing part 314 are respectively arranged at the left end, the right end, the upper end and the lower end of the bending frame body 310. The left vertical plate 311, the right vertical plate 312, the upper fixing part 313 and the lower fixing part 314 are connected to form a long rectangular frame. The pressing die 320 and the turning die 330 are arranged in the space surrounded by the bending frame body 310. An elevating module 340 is further arranged between the bending device 300 and the linear module 400. The elevating module 340 includes a support plate 341, a linear bearing 342, a cylindrical shaft 343 and an elevating hydraulic cylinder 344. The lead screw nut 422 is fixedly connected to the support plate 341. The corresponding sliders of the linear slide rail 410 are fixed to the bottoms of both sides of the support plate 341. Four linear bearings 342 are evenly distributed and installed on the support plate 341. Four corresponding cylindrical shafts 343 are fixed at the corresponding positions of the lower fixing part 314 of the bending frame body 310. The elevating hydraulic cylinder 344 is fixed in the middle of the lower fixing part 314, and the output shaft of the elevating hydraulic cylinder 344 is connected to the support plate 341. The cooperation of the elevating module 340 and the linear module 400 enables the bending device 300 to reciprocate back and forth and up and down on the frame 100.

[0033] The pressing die 320 is arranged in the upper space of the bending frame body 310. The pressing die 320 includes a pressing plate 321 and a pressing hydraulic cylinder 322. The pressing plate 321 is in a plate shape, and a pressing and folding part is arranged at the lower end of the pressing plate 321. Opposite sliding grooves 315 are arranged on the inner sides of the left vertical plate 311 and the right vertical plate 312. The left and right ends of the pressing die 320 are respectively arranged in the sliding grooves 315 and slide up and down reciprocally along the sliding grooves 315. The upper fixing part 313 is formed by welding two square rods and a hydraulic cylinder mounting plate. The pressing hydraulic cylinder 322 is mounted on the upper fixing part 313, and the output shaft of the pressing hydraulic cylinder 322 is connected to the pressing plate 321. The pressing die 320 is further provided with a balance shaft 323. The balance shaft 323 is arranged on one side of the pressing plate 321. The balance shaft 323 is a round shaft, and bearing supports are arranged at both ends of the balance shaft 323. Both ends of the balance shaft 323 are respectively movably connected to the left vertical plate 311 and the right vertical plate 312 through the bearing supports. Two gears are arranged on the balance shaft 323, and corresponding racks are arranged on the pressing plate 321. The gears and the racks are meshed with each other.

[0034] The flipping die 330 is arranged in the lower space of the bending frame body 310. The flipping die 330 includes a connecting section 334, a flipping plate 333 and a rotating hydraulic cylinder 332. A folding part is arranged in the middle of the flipping plate 333. There are two connecting sections 334, and the two connecting sections 334 are respectively fixedly connected to both sides of the flipping plate 333. There are two rotating hydraulic cylinders 332, and the two rotating hydraulic cylinders 332 are respectively fixed on the left vertical plate 311 and the right vertical plate 312. The output shaft of the rotating hydraulic cylinder 332 is fixedly connected to the corresponding connecting section 334. The pressing dies 320 and the flipping dies 330 of the two bending devices 300 are respectively arranged in opposite directions along the connecting line direction of the two bending devices 300.

[0035] The conveying device 200 further includes a feeding belt line 500 and a discharging belt line 600. The conveying directions of the feeding belt line 500, the discharging belt line 600 and the conveying belt line 210 are the same. The feeding belt line 500 is arranged in front of the conveying belt line 210, and the discharging belt line 600 is arranged behind the conveying belt line 210.

[0036] Refer to Figures 1 to 5, when processing the board using this double-sided turning board machine for boards, first, set the distance between the two bending devices 300 through the linear module 400 so that the distance between the two bending devices 300 is the corresponding distance required for double-sided bending of the board, and ensure that the output shaft of the pressing hydraulic cylinder 322 of the pressing die 320 is in the retracted state at this time, the pressing part of the pressing plate 321 is at the upper end of the lifting stroke, the folding part of the flipping die 330 is in the non-flipped state in the horizontal direction, the lifting module 340 is also at the lower stroke, the bending device 300 is at a low position, and the board can pass between the pressing part and the folding part. Then, place the unprocessed board with the two sides to be bent as required in the front-rear direction on the feeding belt line 500, and the feeding belt line 500 conveys the board forward between the pressing part and the folding part to the conveying belt line 210, and the conveying belt line 210 continues to convey the board forward until the position where the board needs to be bent is aligned with the two bending devices 300. Next, the lifting module 340 rises, causing the bending device 300 to rise, and the folding part of the flipping die 330 rises to the position where the board is to be bent. After that, the output shafts of the pressing hydraulic cylinders 322 of the two bending devices 300 extend, and the pressing plate 321 slides downward along the two side chutes 315 until the pressing part at the lower end of the pressing plate 321 presses the board. Immediately afterwards, the rotating cylinders 332 of the two bending devices 300 act to flip the flipping die, and the folding part flips upward against the edge of the board and then returns to the original state. The pressing die 320 rises, and the pressing hydraulic cylinder 322 returns to the retracted state. Thus, one-time bending of the two sides of the board is completed. At this time, if it is not necessary to bend the board multiple times, the lifting module 340 lowers the height of the bending device 300, and the conveying belt line 210 and the discharging belt line 600 will convey the board forward until it exits the range of the bending device 300; if it is necessary to continue bending the board multiple times, after the lifting module 340 lowers the height of the bending device 300, the linear module 400 will act to move the two bending devices 300 a certain distance relative to each other, and then repeat the bending actions of the pressing die 320 and the flipping die 330 until the secondary bending is completed; if it is necessary to continue bending, then repeat the actions of the lifting module 340, the linear module 400, and the pressing die 320 and the flipping die 330. After multiple bendings are completed, the board is sent out.

[0037] In some embodiments, a pressing device is provided on the conveying belt line 210, and the pressing device presses the board on the conveying belt line 210.

[0038] In some embodiments, the conveying device 200 is not provided with a feeding belt line 500 or a discharging belt line 600, and the board to be bent is conveyed to the conveying belt line 210 through other devices or manually.

[0039] In some embodiments, a plurality of casters and feet are installed at the bottom of the frame 100. The casters can be brought into contact with the ground by raising the feet to facilitate the transfer of the bending machine, and the bending machine can be fixed by lowering the feet and cooperating with the floor socket.

[0040] In some embodiments, the upper fixing member 313 is plate-shaped and has mounting holes corresponding to the pressing hydraulic cylinder 322 thereon.

[0041] In some embodiments, the bending device 300 is not provided with a lifting module 340, and the relative heights of the two bending devices 300 and the conveyor belt line 210 remain unchanged.

[0042] In some embodiments, the frame 100 is formed by overlapping angle steels and the like.

[0043] In some embodiments, the bending machine further includes an electric control box. Electric control components of the bending machine are installed in the electric control box, and the electric control box is fixed to the side surface of the frame 100.

[0044] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A double-sided turning machine for plates, characterized in that: Comprising: A frame (100); A conveying device (200), the conveying device (200) is arranged in the middle of the frame (100), the conveying device (200) includes a conveying belt line (210) and a conveying belt line bracket (220), the conveying belt line bracket (220) is arranged between the conveying belt line (210) and the frame (100), and the conveying belt line bracket (220) is fixedly connected to the conveying belt line (210) and the frame (100); Two bending devices (300), the two bending devices (300) are respectively arranged at the front and rear of the frame (100), the bending device (300) includes: a bending frame body (310), a pressing die (320) and a flipping die (330), the pressing die (320) and the flipping die (330) are arranged inside the bending frame body (310); the pressing die (320) includes a pressing plate (321) and a pressing hydraulic cylinder (322), a pressing and folding part is arranged at the lower end of the pressing plate (321), the pressing hydraulic cylinder (322) is arranged on the bending frame body (310), and the output shaft of the pressing hydraulic cylinder (322) is connected to the pressing plate (321); the flipping die (330) includes a flipping block (331) and a rotating oil cylinder (332), a folding part is arranged in the middle of the flipping block (331), the rotating oil cylinder (332) is fixed on the bending frame body (310), and the output shaft of the rotating oil cylinder (332) is fixedly connected to the flipping block (331); A linear module (400), the linear module (400) is arranged between the bending device (300) and the frame (100), the linear module (400) includes a linear slide rail (410) and a lead screw assembly (420), the bending frame body (310) is installed on the frame (100) through the linear slide rail (410), and the bending frame body (310) moves on the frame (100) through the lead screw assembly (420) and the linear slide rail (410); The bending device (300) further includes a lifting module (340), the lifting module (340) is arranged between the bending frame body (310) and the linear module (400), the lifting module (340) is composed of a support plate (341), a linear bearing (342), a cylindrical shaft (343) and a lifting hydraulic cylinder (344), and the bending frame body (310) and the linear module (400) are slidably connected in the vertical direction through the linear bearing (342) and the cylindrical shaft (343); There are four linear bearings (342) and four cylindrical shafts (343). The linear bearings (342) are evenly distributed and fixed on the support plate (341). The cylindrical shafts (343) are all fixed to the bottom end of the bending frame body (310). The lifting hydraulic cylinder (344) is fixed to the middle of the bottom end of the bending frame body (310). The linear bearings (342) are sleeved on the cylindrical shafts (343), and the output shaft of the lifting hydraulic cylinder (344) is connected to the support plate (341).

2. The double-sided turning machine for plates according to claim 1, characterized in that: The bending frame body (310) includes a left vertical plate (311), a right vertical plate (312), an upper fixing member (313) and a lower fixing member (314). The left vertical plate (311), the right vertical plate (312), the upper fixing member (313) and the lower fixing member (314) are respectively arranged at the left end, the right end, the upper end and the lower end of the bending frame body (310). The left vertical plate (311), the right vertical plate (312), the upper fixing member (313) and the lower fixing member (314) are welded together to form a rectangular frame. There are two rotary hydraulic cylinders (332), and the two rotary hydraulic cylinders (332) are respectively fixed on the left vertical plate (311) and the right vertical plate (312).

3. The double-sided turning machine for plates according to claim 2, characterized in that: Relative sliding grooves (315) are provided on the inner sides of the left vertical plate (311) and the right vertical plate (312). The left and right ends of the pressing die (320) are respectively arranged in the sliding grooves (315) and slide up and down reciprocally along the sliding grooves (315).

4. The double-sided turning machine for plates according to claim 3, characterized in that: The pressing die (320) is further provided with a balance shaft (323). The balance shaft (323) is arranged on one side of the pressing plate (321). The balance shaft (323) is a circular shaft. Bearing supports are provided at both ends of the balance shaft (323). The two ends of the balance shaft (323) are respectively movably connected to the left vertical plate (311) and the right vertical plate (312) through the bearing supports. Two gears are provided on the balance shaft (323), and corresponding racks are provided on the pressing plate (321). The gears and the racks are meshed with each other.

5. The double-sided turning machine for plates according to claim 1, characterized in that: The turning block (331) is provided with a connecting section (334) and a turning plate (333). There are two connecting sections (334), and the two connecting sections (334) are respectively fixedly connected to both sides of the turning plate (333). The output shaft of the rotary hydraulic cylinder (332) is fixedly connected to the corresponding connecting section (334).

6. The double-sided turning machine for plates according to claim 1, characterized in that: There are two linear slide rails (410). The linear slide rails (410) include guide rails and sliders. The guide rails are installed on the left and right sides of the frame (100), and the sliders are installed at corresponding positions at the bottom of the bending frame body (310). The guide rails and the sliders are slidably connected. The lead screw assembly (420) includes a lead screw (421), a lead screw nut (422), a fixed seat (423), a support (424) and a servo motor (425). The fixed seat (423) and the support (424) are fixed on the frame (100). The lead screw (421) is arranged between the fixed seat (423) and the support (424). The servo motor (425) is connected to the lead screw (421) through a coupling. The lead screw nut (422) is threadedly connected to the lead screw (421), and the lead screw nut (422) is fixedly connected to the bottom of the bending frame body (310).

7. The double-sided turning machine for plates according to claim 1, characterized in that: It further includes a feeding belt line (500) and a discharging belt line (600). The feeding belt line (500), the discharging belt line (600) and the conveying belt line (210) have the same conveying direction. The feeding belt line (500) is arranged in front of the conveying belt line (210), and the discharging belt line (600) is arranged behind the conveying belt line (210).

8. The double-sided turning machine for plates according to claim 1, characterized in that: A pressing device is arranged on the conveying belt line (210). The pressing device presses the plate on the conveying belt line (210) through the movement of its components.

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