A multi-station hydraulic punching machine for numerically controlled multi-sided bending

Abstract

The present invention belongs to the technical field of hydraulic presses, and specifically relates to a multi-station hydraulic press for numerically controlled multi-sided bending. It includes a bed body, a pressing plate and a supporting plate. There are two bed bodies, and the two bed bodies are connected by a connecting table. The left and right sides of the connecting table are fixedly connected to the two bed bodies respectively. A square groove is formed on the upper surface of the bed body, and a conveyor belt is installed in the square groove. Shaft plates are arranged at the front and rear ends of the conveyor belt. Both ends of the pulley shaft of the conveyor belt penetrate through the shaft plates and are slidably connected to the penetrated positions. The shaft plates are elastically connected to the bottom surface of the square groove through several groups of springs. Bending mechanisms are installed on the rear side of the left bed body and the front side of the right bed body, and a two-way bending mechanism is installed on the top of the connecting table. By setting the structure of the left and right two stations, the present invention can control the processing of plates with the same width for different lengths according to needs, and at the same time realizes production in a pipeline manner, with a simple structure, convenient operation, and greatly improves the processing and production efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic presses, and specifically relates to a multi-station hydraulic press for numerically controlled multi-sided bending. Background Art

[0002] As a general-purpose machine in sheet metal machinery, the bending machine has been increasingly widely used worldwide in recent years due to its simple operation, powerful functions, and relatively low cost. At the same time, various technologies have been increasingly applied and enhanced on the bending machine. Among them, hydraulic technology is at the forefront and has made great contributions to the development of the bending machine.

[0003] Currently, the thin plate processing usually uses a hydraulic-driven bending machine. During the production process, when it is necessary to bend the four sides of a square plate by 90 degrees, usually three technical solutions are adopted. One is to use a customized die and the machine to perform a one-time stamping on the roughly processed plate to fold up the four sides simultaneously to achieve the purpose of multi-sided bending. This method has fast forming, high precision, simple operation, and can realize assembly line production. However, this method can only process plates with fixed length and width to obtain products with fixed length and width, lacking flexibility. The second is to use an ordinary single-sided bending machine to bend the four sides separately. This method can adjust the bending position at any time according to needs and can process plates with different size requirements. However, this method requires the operator to always be at the work station, manually filling and unloading materials, which will consume a large amount of man-hours and manpower, greatly reducing the production efficiency. The third is to use a high-precision numerically controlled multi-sided bending machine. This method has the highest precision, the strongest flexibility, and the product quality is much higher than the previous two. However, this method also requires the operator to always be at the work station for loading and unloading materials, and cannot realize assembly line production, with low efficiency, high cost, and the structure of the numerically controlled multi-sided bending machine is complex, requiring the operator to have a certain professional skill foundation.

[0004] In summary, most of the current hydraulic press equipment for bending cannot achieve batch production on an assembly line while bending the four sides of a square plate with the same width but different lengths by 90 degrees. Relatively speaking, it consumes a lot of manpower and material resources, has low production efficiency, and high costs. In view of this, the present invention is proposed to overcome the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-station hydraulic press for numerically controlled multi-sided bending. The specific problem to be solved by the present invention is that most of the current hydraulic press equipment for bending cannot achieve batch production on an assembly line while bending the four sides of a square plate by 90 degrees, and relatively speaking, it consumes a lot of manpower and material resources, has low production efficiency, and high costs.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A multi-station hydraulic punching machine for numerically controlled multi-sided bending, comprising a bed body, a pressing plate and a supporting plate. There are two bed bodies, and the two bed bodies are connected by a connecting table. The left and right sides of the connecting table are fixedly connected to the two bed bodies respectively. A square groove is formed on the upper surface of the bed body, and a conveyor belt is installed in the square groove. Axle plates are arranged at the front and rear ends of the conveyor belt. Both ends of the pulley shaft of the conveyor belt penetrate through the axle plates and are slidably connected to the penetrated positions. The axle plates are fixedly connected to the bottom surface of the square groove through a plurality of groups of springs;

[0008] On the right side of the front wall of the left bed body and on the left side of the rear wall of the right bed body, motors are fixedly connected. The rotating shafts of the motors penetrate through the bed bodies and are fixedly connected to one end of a universal coupling inside the bed body walls. The other end of the universal coupling is fixedly connected to the driving shaft of the conveyor belt;

[0009] Bending mechanisms are installed on the rear side of the left bed body and on the front side of the right bed body, and a two-way bending mechanism is installed on the top of the connecting table;

[0010] Guide columns are vertically fixedly connected to the four corners on the rear side of the left bed body and the four corners on the front side of the right bed body. Guide columns are also vertically fixedly connected to the right front corner of the left bed body and the left rear corner of the right bed body. The pressing plate is approximately Z-shaped and is penetrated by six guide columns and is slidably connected to the guide columns. Supporting plates are fixedly connected above the guide columns at the two rear corners of the left bed body, and supporting plates are fixedly connected above the guide columns at the two front corners of the right bed body. Main hydraulic cylinders are fixedly connected to the centers of the tops of the two supporting plates. The piston rods of the main hydraulic cylinders penetrate through the supporting plates and are fixedly connected to the upper surface of the pressing plate below;

[0011] Preferably, the length of the plate processed by the hydraulic punching machine is greater than the distance between the two mutually approaching surfaces of the conveyor belts on the upper surfaces of the two bed bodies.

[0012] Preferably, the bending mechanism includes an A top block, an A slider, an A spring and an A hydraulic cylinder. A hydraulic cylinder cavity is formed inside the rear side wall of the left bed body. A number of A hydraulic cylinders are installed in the hydraulic cylinder cavity. The rear wall of the hydraulic cylinder cavity is a detachable structure, and the rear wall of the hydraulic cylinder cavity is threadedly connected to the bed body;

[0013] The top of the cross-section of the A top block is L-shaped. The rear side surface of the A slider is connected to the front side surface of the vertical side of the A top block through a number of A springs. The upper surface of the A slider is lower than the upper surface of the A top block. The front surface of the A slider is arc-shaped. A chute is formed at the rear side of the top of the left bed body. The whole of the A top block and the A slider is slidably connected to the chute. The piston rod of the A hydraulic cylinder penetrates through the top of the hydraulic cylinder cavity and is fixedly connected to the bottom of the A top block;

[0014] The front side wall of the bed body on the right side is installed with the same bending mechanism, which is centrosymmetric with the bending mechanism in the left bed body about the center of the connecting table on the horizontal plane.

[0015] Preferably, the double-direction bending mechanism includes a B hydraulic cylinder, a B top block, a B slider and a B spring. There are several B hydraulic cylinders, which are fixedly connected to the top of the connecting table. The top of the piston rod of the B hydraulic cylinder is fixedly connected to the bottom of the B top block. The top of the B top block is fixedly connected with several guide rails. The bottom of the B slider is provided with several matching guide grooves. The B top block and the B slider are slidably connected through the cooperation of the guide rails and the guide grooves. There are two B sliders, which are symmetrically distributed left and right. The two B sliders are elastically connected by several B springs. The B springs are respectively fixedly connected to the left side wall of the right B slider and the right side wall of the left B slider. The mutually remote sides of the two B sliders are both arc-shaped.

[0016] Support seats are symmetrically and fixedly connected to the left and right sides of the B hydraulic cylinder. Guide wheels are installed at the positions of the right side wall of the bed body on the left side of the top of the B hydraulic cylinder and the left side wall of the right bed body, which are at the same height as the B top block. The whole of the B slider and the B top block is in rolling connection with the two side guide wheels.

[0017] Preferably, four pressing blocks are vertically and fixedly connected to the bottom of the pressing plate. The four pressing blocks are strip-shaped and respectively cooperate with the bending mechanism and the double-direction bending mechanism on the bed body. The cross-section of the pressing block is an inverted T shape with a sharp angle at the bottom.

[0018] Preferably, when the spring between the A slider and the A top block is in the extended state, the front wall of the A slider extends beyond the front wall of the A top block. When the A slider and the pressing block cooperate to bend, the sheet material can be bent to less than 90 degrees. The cooperation state of the two B sliders and the B top block is the same as that of the A slider and the A top block.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. By setting the structures of the left and right two workstations, the present invention can control the processing of sheets with the same width and different lengths as required, and at the same time realizes the production in a streamlined manner. Compared with the numerically controlled multi-sided bending machine that can achieve the same function, the structure is simplified, the operation is more convenient, and the processing and production efficiency is greatly improved. In addition, a spring is added to the shaft plate in the present invention to replace the fixed connection with an elastic connection, and a universal coupling is arranged at the motor rotating shaft, so that the motor can still transmit correctly when floating slightly up and down on the conveyor belt. When the pressing plate presses down, the sheet material conducts the pressure to the conveyor belt, and the conveyor belt sinks under the force, so that the sheet material contacts the edge of the bed body and conducts the force to the bed body, avoiding damage to the conveyor belt due to force.

[0021] 2. By restricting the structure of the pressing block and the initial positions of slider A and slider B, the bending mechanism of the present invention can bend the sheet material to an angle less than 90 degrees. The purpose is to utilize the springback of the sheet material during stamping so that when the hydraulic cylinder retracts after the bending of the sheet material is completed, the edge rebounds by a certain angle, making the bending angle of the finished product just close to 90 degrees. To ensure the processing effect, the elastic coefficients of several A-springs and B-springs between slider A and top block A, and between slider B and top block B can be selected according to the springback coefficients of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an intuitive view of the sheet material suitable for processing by the present invention;

[0023] Figure 2 is a top view of the present invention;

[0024] Figure 3 is a schematic structural diagram of the front view of the present invention;

[0025] Figure 4 is of the present invention Figure 3 A-A cross-sectional schematic diagram;

[0026] Figure 5 is a mating diagram of the guide rail and the guide groove of the present invention;

[0027] Figure 6 is a schematic structural diagram of the left view of the present invention;

[0028] Figure 7 is of the present invention Figure 6 I enlarged view.

[0029] In the figure: bed 1, conveyor belt 11, shaft plate 12, spring 13, motor 14, bending mechanism 15, top block A 151, slider A 152, A-spring 153, A-hydraulic cylinder 154, chute 155, guide post 16, pressing plate 2, pressing block 21, support plate 3, main hydraulic cylinder 31, connecting table 4, double-sided bending mechanism 41, B-hydraulic cylinder 411, top block B 412, slider B 413, B-spring 414, guide rail 415, guide groove 416, small guide wheel 417, large guide wheel 418. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 to 7, in the embodiment of the present invention, a multi-station hydraulic punching machine for numerical control multi-sided bending includes a bed body 1, a pressing plate 2 and a supporting plate 3. There are two bed bodies 1, and the two bed bodies 1 are connected by a connecting table 4. The left and right sides of the connecting table 4 are fixedly connected to the two bed bodies 1 respectively. A square groove is provided on the upper surface of the bed body 1, and a conveyor belt 11 is installed in the square groove. Axle plates 12 are arranged at the front and rear ends of the conveyor belt 11. Both ends of the pulley shaft of the conveyor belt 11 penetrate through the axle plates 12 and are slidably connected to the penetrated positions. The axle plates 12 are elastically connected to the bottom surface of the square groove through a plurality of groups of springs 13;

[0032] On the right side of the front wall of the left bed body 1 and on the left side of the rear wall of the right bed body 1, a motor 14 is fixedly connected. The rotating shaft of the motor 14 penetrates through the bed body 1 and is fixedly connected to one end of a universal coupling inside the wall of the bed body 1. The other end of the universal coupling is fixedly connected to the driving shaft of the conveyor belt 11;

[0033] The two motors 14 are respectively controlled by two sets of independent servo systems, and the moving distance of the sheet on the bed body 1 can be controlled as needed, so as to achieve the purpose of bending and processing sheets with the same width into different lengths;

[0034] Bending mechanisms 15 are installed on the rear side of the left bed body 1 and on the front side of the right bed body 1, and a two-way bending mechanism 41 is installed on the top of the connecting table 4;

[0035] Guide columns 16 are vertically fixedly connected to the two corners on the rear side of the left bed body 1 and the two corners on the front side of the right bed body 1. Guide columns 16 are also vertically fixedly connected to the right front corner of the left bed body 1 and the left rear corner of the right bed body 1. The pressing plate 2 is approximately Z-shaped and is penetrated by six guide columns 16 and is slidably connected to the guide columns 16. Support plates 3 are fixedly connected above the guide columns 16 at the two corners on the rear side of the left bed body 1, and support plates 3 are fixedly connected above the guide columns 16 at the two corners on the front side of the right bed body 1. Main hydraulic cylinders 31 are fixedly connected to the centers of the tops of the two support plates 3. The piston rods of the main hydraulic cylinders 31 penetrate through the support plates 3 and are fixedly connected to the upper surface of the lower pressing plate 2;

[0036] By setting the structure of the left and right two stations, the present invention can control the processing of sheets with the same width into different lengths as needed, and at the same time realizes pipeline production. Compared with the numerical control multi-sided bending machine that can achieve the same function, the structure is simplified, the operation is more convenient, and the processing and production efficiency is greatly improved. In addition, the present invention adds springs 13 on the axle plates 12 to replace the fixed connection with an elastic connection, and at the same time sets a universal coupling at the rotating shaft of the motor 14, so that the motor 14 can still transmit correctly when the conveyor belt 11 floats slightly up and down. When the pressing plate 2 presses down, the sheet transmits the pressure to the conveyor belt 11, and the conveyor belt 11 sinks under the force, so that the sheet contacts the edge of the bed body 1 and transmits the force to the bed body 1, avoiding damage to the conveyor belt 11 due to force.

[0037] As an implementation manner of the present invention, the length of the plate processed by the hydraulic press is greater than the distance between the conveyor belts 11 on the upper surfaces of the two bed bodies 1;

[0038] The length of the processed plate is restricted so that the plate processed on the left bed body 1 can be smoothly transferred to the right bed body 1 without jamming.

[0039] As an implementation manner of the present invention, the bending mechanism 15 includes an A top block 151, an A slider 152, an A spring 153, and an A hydraulic cylinder 154. A hydraulic cylinder cavity is provided in the rear side wall of the bed body 1 on the left side. A number of A hydraulic cylinders 154 are installed in the hydraulic cylinder cavity. The rear wall of the hydraulic cylinder cavity is a detachable structure, and the rear wall of the hydraulic cylinder cavity is threadedly connected to the bed body 1;

[0040] The side wall of the hydraulic cylinder cavity is set as a detachable structure, which is convenient for the maintenance and repair of the A hydraulic cylinder 154;

[0041] The top of the cross-section of the A top block 151 is L-shaped. The rear side surface of the A slider 152 is connected to the front side surface of the vertical side of the A top block 151 through a number of A springs 153. The upper surface of the A slider 152 is lower than the upper surface of the A top block 151. The front surface of the A slider 152 is arc-shaped. A chute 155 is provided at the rear side of the top of the bed body 1 on the left side. The whole of the A top block 151 and the A slider 152 is slidably connected to the chute 155. The piston rod of the A hydraulic cylinder 154 penetrates through the top of the hydraulic cylinder cavity and is fixedly connected to the bottom of the A top block 151;

[0042] The upper surface of the A slider 152 is lower than the upper surface of the A top block 151, so that the processed plate can be accurately transmitted on the upper surface of the bed body 1. The part of the A top block 151 higher than the upper surface of the A slider 152 can play a role in limiting and guiding the processed plate. When the present invention is in use, after the motor 14 of the left bed body 1 transports the plate to the designated position, it is pressed down by the main hydraulic cylinder 31 arranged above, driving the pressing plate 2 to press down to realize the fixing of the plate. Subsequently, the A hydraulic cylinder 154 rises, the A slider 152 is stressed, the force is transmitted to the A spring 153, the A spring 153 contracts, and at the same time the A top block 151 continues to rise to fold up the rear edge of the plate, and the chute 155 plays a limiting role;

[0043] A same bending mechanism 15 is installed in the front side wall of the bed body 1 on the right side and is centrosymmetric with the bending mechanism 15 in the bed body 1 on the left side about the center of the connecting table 4 in the horizontal plane;

[0044] After the plate is processed on the left bed body 1, the motor 14 sends the plate away from the left bed body 1. At the same time, the motors 14 on both sides cooperate to transport the plate to the right bed body 1. The bending mechanism 15 in the front side wall of the right bed body 1 folds up the front edge of the plate in the same operation mode.

[0045] As an embodiment of the present invention, the double-sided bending mechanism 41 includes a B hydraulic cylinder 411, a B top block 412, a B slider 413 and a B spring 414. There are several B hydraulic cylinders 411 fixedly connected to the top of the connecting platform 4. The top of the piston rod of the B hydraulic cylinder 411 is fixedly connected to the bottom of the B top block 412. Several guide rails 415 are fixedly connected to the top of the B top block 412. Several matching guide grooves 416 are formed at the bottom of the B slider 413. The B top block 412 and the B slider 413 are slidably connected through the cooperation of the guide rails 415 and the guide grooves 416. There are two B sliders 413 distributed symmetrically left and right. The two B sliders 413 are elastically connected by several B springs 414. The B springs 414 are respectively fixedly connected to the left side wall of the right B slider 413 and the right side wall of the left B slider 413. The mutually remote sides of the two B sliders 413 are both arc-shaped;

[0046] During the use of the present invention, the left and right bed bodies 1 work simultaneously. After the pressing plate 2 fixes the two side plates, the B hydraulic cylinder 411 drives the B top block 412 to rise. The two B sliders 413 are stressed to compress the B springs 414 and continue to rise at the same time. The right edge of the left plate and the left edge of the right plate are respectively folded up by the two top blocks;

[0047] Several small guide wheels 417 are installed on the top of the B top block 412 for the movement of the plate;

[0048] Support seats are symmetrically and fixedly connected to the left and right sides of the B hydraulic cylinder 411. Large guide wheels 418 are installed at the positions of the right side wall of the left bed body 1 and the left side wall of the right bed body 1 on the left side of the top of the B hydraulic cylinder 411 and at the same height as the B top block 412. The whole of the B slider 413 and the B top block 412 is in rolling connection with the large guide wheels 418 on both sides. The large guide wheels 418 on the side walls play a longitudinal limiting role on the whole of the B slider 413 and the B top block 412.

[0049] As an embodiment of the present invention, four pressing blocks 21 are vertically and fixedly connected to the bottom of the pressing plate 2. The four pressing blocks 21 are strip-shaped and are respectively matched with the bending mechanism 15 and the double-sided bending mechanism 41 on the bed body 1. The cross-section of the pressing block 21 is an inverted T shape with a sharp angle at the bottom.

[0050] When the spring between the A slider 152 and the A top block 151 is in the extended state, the front wall of the A slider 152 extends beyond the front wall of the A top block 151. When the A slider 152 and the pressing block 21 cooperate to bend, the plate can be bent to less than ninety degrees;

[0051] Through the structural limitation of the pressing block 21 and the initial position limitation of the A slider 152 and the B slider 413, the bending mechanism 15 can bend the sheet to an angle less than 90 degrees. The purpose is to utilize the stamping springback of the sheet, so that when the hydraulic cylinder withdraws after the sheet bending is completed, the edge rebounds at a certain angle, making the bending angle of the finished product just close to 90 degrees. To ensure the processing effect, the elastic coefficients of several A springs 153 and B springs 414 between the A slider 152 and the A top block 151, and between the B slider 413 and the B top block 412 can be selected according to the springback coefficients of different materials.

[0052] The cooperation state of the two B sliders 413 and the B top block 412 is the same as that of the A slider 152 and the A top block 151.

[0053] Working principle: After the motor 14 on the left bed body 1 transports the sheet to the designated position, it is pressed down by the main hydraulic cylinder 31 arranged above, driving the pressing plate 2 to press down to achieve the fixing effect on the sheet. When the pressing plate 2 presses down, the sheet conducts the pressure to the conveyor belt 11, and the conveyor belt 11 sinks under the force, making the sheet contact the edge of the bed body 1 and conducting the force to the bed body 1, avoiding damage to the conveyor belt 11 due to force. Subsequently, the A hydraulic cylinder 154 rises, the A slider 152 is stressed, and the force is transmitted to the A spring 153. The A spring 153 contracts, and at the same time, the A top block 151 continues to rise, folding up the rear edge of the sheet. The chute 155 plays a limiting role for the A slider 152 and the A top block 151. The upper surface of the A slider 152 is lower than the upper surface of the A top block 151, enabling the processed sheet to accurately move on the upper surface of the bed body 1. The part of the A top block 151 higher than the upper surface of the A slider 152 can play a limiting and guiding role for the processed sheet. Subsequently, the main hydraulic cylinder 31 rises, driving the pressing plate 2 to rise, starting the motor 14, and the conveyor belt 11 drives the sheet to the right bed body 1. At the same time, a new sheet enters the left bed body 1. Subsequently, the main hydraulic cylinder 31 drives the pressing plate 2 to press down. After the pressing plate 2 fixes the two side sheets again, the B hydraulic cylinder 411 drives the B top block 412 to rise. The two B sliders 413 are stressed to compress the B spring 414 and continue to rise. The right edge of the left sheet and the left edge of the right sheet are respectively folded up by the two top blocks. At the same time, the left bending mechanism 15 folds up the rear edge of the sheet on the left bed body 1, and the right bending mechanism 15 folds up the front edge of the sheet on the right bed body 1. When the sheet passes through the two bed bodies 1, all four sides are folded up, completing the 90-degree bending operation of the four sides of the sheet. To ensure the processing effect, the elastic coefficients of several A springs 153 and B springs 414 between the A slider 152 and the A top block 151, and between the B slider 413 and the B top block 412 can be selected according to the springback coefficients of different materials.

[0054] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not exist, the above embodiments only express several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention; therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A multi-station hydraulic punching machine for numerically controlled multi-sided bending, comprising a machine body (1), a pressing plate (2) and a supporting plate (3). It is characterized in that: There are two of the machine bodies (1), and the two machine bodies (1) are connected by a connecting platform (4). The left and right sides of the connecting platform (4) are fixedly connected to the two machine bodies (1) respectively. A square groove is formed on the upper surface of the machine body (1), and a conveyor belt (11) is installed in the square groove. Axle plates (12) are arranged at the front and rear ends of the conveyor belt (11). Both ends of the pulley shaft of the conveyor belt (11) penetrate through the axle plates (12) and are slidably connected to the penetrated positions. The axle plates (12) are fixedly connected to the bottom surface of the square groove through a plurality of groups of springs (13). On the right side of the front wall of the left machine body (1) and on the left side of the rear wall of the right machine body (1), motors (14) are fixedly connected. The rotating shaft of the motor (14) penetrates through the machine body (1) and is fixedly connected to one end of a universal coupling inside the wall of the machine body (1). The other end of the universal coupling is fixedly connected to the driving shaft of the conveyor belt (11). Bending mechanisms (15) are installed on the rear side of the left machine body (1) and on the front side of the right machine body (1), and a two-way bending mechanism (41) is installed on the top of the connecting platform (4). Guide columns (16) are vertically fixedly connected to the two corners on the rear side of the left machine body (1) and the two corners on the front side of the right machine body (1). Guide columns (16) are also vertically fixedly connected to the right front corner of the left machine body (1) and the left rear corner of the right machine body (1). The pressing plate (2) is approximately Z-shaped and is penetrated by six guide columns (16) and is slidably connected to the guide columns (16). Supporting plates (3) are fixedly connected above the guide columns (16) at the two rear corners of the left machine body (1). Supporting plates (3) are fixedly connected above the guide columns (16) at the two front corners of the right machine body (1). Main hydraulic cylinders (31) are fixedly connected to the centers of the tops of the two supporting plates (3). The piston rods of the main hydraulic cylinders (31) penetrate through the supporting plates (3) and are fixedly connected to the upper surface of the lower pressing plate (2). The length of the plate processed by the hydraulic punching machine is greater than the distance between the conveyor belts (11) on the upper surfaces of the two machine bodies (1). The bending mechanism (15) includes an A top block (151), an A slider (152), an A spring (153) and an A hydraulic cylinder (154). A hydraulic cylinder cavity is formed inside the rear side wall of the left machine body (1). A plurality of A hydraulic cylinders (154) are installed in the hydraulic cylinder cavity. The rear wall of the hydraulic cylinder cavity is a detachable structure, and the rear wall of the hydraulic cylinder cavity is threadedly connected to the machine body (1). The top of the cross-section of the A top block (151) is L-shaped. The rear side of the A slider (152) is connected to the front side of the vertical side of the A top block (151) by a number of A springs (153). The upper surface of the A slider (152) is lower than the upper surface of the A top block (151). The front surface of the A slider (152) is arc-shaped. A chute (155) is provided at the rear side of the top of the bed body (1) on the left side. The whole of the A top block (151) and the A slider (152) is slidably connected to the chute (155). The piston rod of the A hydraulic cylinder (154) penetrates through the top of the hydraulic cylinder chamber and is fixedly connected to the bottom of the A top block (151); The same bending mechanism (15) is installed inside the front side wall of the bed body (1) on the right side and is centrosymmetric with the bending mechanism (15) inside the bed body (1) on the left side about the center of the connecting table (4) in the horizontal plane; The double-sided bending mechanism (41) includes a B hydraulic cylinder (411), a B top block (412), a B slider (413) and B springs (414). A number of the B hydraulic cylinders (411) are fixedly connected to the top of the connecting table (4). The top of the piston rod of the B hydraulic cylinder (411) is fixedly connected to the bottom of the B top block (412). A number of guide rails (415) are fixedly connected to the top of the B top block (412). A number of matching guide grooves (416) are provided at the bottom of the B slider (413). The B top block (412) and the B slider (413) are slidably connected through the cooperation of the guide rails (415) and the guide grooves (416). Two of the B sliders (413) are distributed symmetrically left and right. The two B sliders (413) are elastically connected by a number of B springs (414). The B springs (414) are respectively fixedly connected to the left side wall of the right B slider (413) and the right side wall of the left B slider (413). The mutually remote surfaces of the two B sliders (413) are both arc-shaped; A number of small guide wheels (417) are installed on the top of the B top block (412); Support seats are symmetrically and fixedly connected to the left and right sides of the B hydraulic cylinder (411). Large guide wheels (418) are installed at the positions of the right side wall of the bed body (1) on the left side and the left side wall of the bed body (1) on the right side at the same height as the B top block (412). The whole of the B slider (413) and the B top block (412) is in rolling connection with the large guide wheels (418) on both sides; After the motor (14) of the left bed body (1) transports the plate to the designated position, it is pressed down by the main hydraulic cylinder (31) arranged above to drive the pressing plate (2) to press down, so as to achieve the fixing effect on the plate. Subsequently, the A hydraulic cylinder (154) rises, the A slider (152) is stressed, and the force is transmitted to the A spring (153). The A spring (153) contracts. At the same time, the A top block (151) continues to rise to fold up the rear edge of the plate. Subsequently, the main hydraulic cylinder (31) rises to drive the pressing plate (2) to rise, the motor (14) is started, and the conveyor belt (11) drives the plate to the right bed body (1). At the same time, a new plate enters the left bed body (1). Subsequently, the main hydraulic cylinder (31) drives the pressing plate (2) to press down. After the pressing plate (2) re-fixes the two side plates, the B hydraulic cylinder (411) drives the B top block (412) to rise. The two B sliders (413) are stressed to compress the B spring (414) and continue to rise at the same time. The right edge of the left plate and the left edge of the right plate are respectively folded up by the two top blocks. At the same time, the left bending mechanism (15) folds up the rear edge of the plate on the left bed body (1), and the right bending mechanism (15) folds up the front edge of the plate on the right bed body (1).

2. A multi-station hydraulic punching machine for numerical control multi-sided bending according to claim 1, characterized in that: Four pressing blocks (21) are vertically and fixedly connected to the bottom of the pressing plate (2). The four pressing blocks (21) are strip-shaped and are respectively matched with the bending mechanism (15) and the double-sided bending mechanism (41) on the bed body (1). The cross-section of the pressing block (21) is an inverted T shape with a sharp angle at the bottom.

3. A multi-station hydraulic punching machine for numerical control multi-sided bending according to claim 1, characterized in that: When the A spring (153) between the A slider (152) and the A top block (151) is in the extended state, the front wall of the A slider (152) extends beyond the front wall of the A top block (151). When the A slider (152) and the pressing block (21) cooperate with each other for bending, the plate can be bent to less than ninety degrees.

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