A metal sheet bending machine

Abstract

This invention relates to the field of bending equipment technology, and provides a metal sheet bending machine, which includes a frame, a lower die base mounted on the frame; two limiting blocks, both mounted on the lower die base, forming a limiting space between the two limiting blocks to allow the upper die to press the workpiece into the limiting space; and two rotating plates, each corresponding to one of the two limiting blocks and rotatably mounted on one of the limiting blocks. The rotating plates can rotate to abut against the top of the two limiting blocks or against one end of the two limiting blocks that is close to each other. The rotating plates are configured to support the bent part. The rotating plates provided by this invention can separate the bent part from the limiting blocks, achieving a planar transition between the bent part and the limiting blocks at the top of the limiting space, avoiding the formation of bending marks. This solves the technical problems in the prior art where, when using a bending machine to avoid bending marks on metal sheets, safety accidents are easily caused and bending paper needs frequent replacement.

Description

Technical Field

[0001] This invention relates to the field of bending equipment technology, and more specifically, to a metal sheet bending machine. Background Technology

[0002] A bending machine is a device that uses mechanical pressure to bend metal sheets into a specific angle or shape. The bending machine uses a hydraulic system or an electrical control system to drive a slider to move the upper die downwards, which contacts the sheet metal fixed on the lower die. Then, the sheet metal is plastically deformed by extrusion to achieve bending.

[0003] In existing technology, the lower die is usually V-shaped, and different sizes of V-shaped seats are selected for different sheet thicknesses. During bending, after the upper die presses the sheet into the V-shaped die seat, the bottom of the upper die's pressure blade has an inverted triangular cross-section. As the pressure blade presses into the V-shaped die seat, the pressure blade of the upper die and the side wall of the opening of the lower die easily squeeze the sheet, forming a bending mark. This is especially true when bending thin sheets on the outer panel of a distribution cabinet, where bending marks are more likely to form, affecting the aesthetics. Currently, bending paper or a non-marking bending die is commonly used when bending thin metal sheets. When using bending paper, a layer of bending paper needs to be placed between the sheet and the upper die before bending to avoid bending marks. However, bending paper is worn out and needs to be replaced after a few uses, which can slow down the overall processing efficiency. A non-marking bending die modifies the lower die into two flip-plate bearings. When the upper die presses the bent part, the two flip-plate bearings rotate with the two sides of the bent part, thus avoiding the formation of bending marks. However, in practical use, the cost of seamless bending dies is high. Different V-shaped supports of different thicknesses are required for different sheet metal thicknesses. Because the positions of the two flip plate bearings are fixed, the same seamless bending die cannot be used to bend sheets of different thicknesses. When bending sheets of different thicknesses is required, the corresponding die must be changed, thus affecting bending efficiency and the purchase cost of the bending machine. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a metal sheet bending machine, which solves the technical problem that the non-marking bending mold in the prior art cannot be applied to sheets of different thicknesses.

[0005] According to one aspect, at least one embodiment of the present invention provides a metal sheet bending machine, including a frame and an upper die and a lower die disposed on the frame, the lower die comprising:

[0006] The lower mold base is mounted on the machine frame;

[0007] The upper die has two limiting blocks, both of which are disposed on the lower die base, and a limiting space is formed between the two limiting blocks, so that the upper die can move down and press the bending part against the limiting space;

[0008] The rotating plate has two plates, which are rotatably mounted on the two limiting blocks in a one-to-one correspondence. The two rotating plates have a supporting state and a separating state. When the two rotating plates are in the supporting state, they together form a supporting surface for supporting the bent part. When the two rotating plates are in the separating state, they can rotate to the side wall adjacent to the two limiting blocks respectively to abut against each other when the upper die presses down on the bent part, thereby separating the bent part from the limiting blocks.

[0009] For example, in a metal sheet bending machine provided in at least one embodiment of the present invention, after the rotating plate rotates to contact the top surface of the limiting block, the adjacent side edges of the two rotating plates can be connected, and the contact edges of the two rotating plates are located on the plane of symmetry with the two limiting blocks.

[0010] For example, in a metal sheet bending machine provided in at least one embodiment of the present invention, the rotating plate has a first plate and a second plate arranged at an angle. The first plate is rotatably disposed on the limiting block. The lower die base is provided with a side baffle located outside the limiting block. The second plate can rotate under its own weight to abut against the side baffle and drive the first plate to rotate to contact the top surface of the limiting block, so that the first plate of the two rotating plates forms the supporting surface.

[0011] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, the top of the limiting block has a shaft groove, the shaft grooves of the two limiting blocks are located on the side of the two limiting blocks that are close to each other, the rotating plate is rotatably disposed in the shaft groove via a rotating shaft, and the machine further includes:

[0012] A mounting base is disposed on the rotating shaft. The mounting base is used to support the rotating plate so that the rotating plate is rotatably disposed on the limiting block.

[0013] For example, in a metal sheet bending machine provided in at least one embodiment of the present invention, the mounting base is slidably connected to the rotating plate, and the two limiting blocks can slide towards each other or away from each other in the lower die base to adjust the width of the limiting space.

[0014] For example, in at least one embodiment of the present invention, a metal sheet bending machine further includes:

[0015] A guide rod is provided on the lower mold base, the guide rod passes through the limiting block, and the guide rod is used to limit the sliding direction of the limiting block;

[0016] A screw is rotatably mounted on the lower mold base. The screw has a first section and a second section with opposite thread directions. Two limiting blocks are threadedly connected to the first section and the second section respectively, so that the screw can drive the two limiting blocks to move closer or further apart.

[0017] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, when the two limiting blocks slide toward each other, the side baffle is used to limit the second plate so that the limiting blocks slide relative to the second plate, and further includes:

[0018] A magnetic block is disposed on the side edge of the first plate away from the second plate, so that the first plates of the two rotating plates can attract each other.

[0019] For example, in at least one embodiment of the present invention, a metal sheet bending machine further includes:

[0020] A collecting element is disposed between the two limiting blocks and is positioned above the light rod. The collecting element is used to collect debris generated during the bending of the bent part.

[0021] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, both ends of the rotating plate protrude outward from the limiting block, both ends of the rotating shaft protrude outward from the shaft groove, both ends of the rotating shaft have threaded holes, and the mounting base has through holes for fasteners to pass through so that the fasteners are threadedly connected to the threaded holes.

[0022] For example, in at least one embodiment of the present invention, a metal sheet bending machine further includes a mounting bracket for mounting the lower die base, the mounting bracket comprising:

[0023] A mounting bracket is installed on the frame;

[0024] A sliding frame is slidably mounted on the fixed frame, and the sliding frame can slide close to the fixed frame so that the sliding frame and the fixed frame can clamp the lower mold base.

[0025] The beneficial effects of this invention are as follows:

[0026] In this invention, the use of bending paper is eliminated by using a rotating plate, which not only effectively reduces the probability of safety accidents and improves the safety of the metal sheet bending process, but also eliminates the need for frequent bending paper replacements, reducing processing interruptions caused by bending paper changes, improving the working efficiency of the bending machine, and enabling more continuous and efficient metal sheet bending. The rotating plate forms a plane between the bent part and the limiting block by rotating, preventing the pressure of the upper die at the top of the limiting space against the top of the original V-shaped bending groove from causing bending marks on the bent part. This improves the surface quality and aesthetics of the bent metal sheet, meeting the processing requirements of products with high appearance requirements, such as the outer panel of a power distribution cabinet. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0030] Figure 3 This is a schematic diagram of the structure of the present invention after concealing the frame and upper mold;

[0031] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0032] Figure 5 This is a schematic diagram of another structural state after the hidden frame and upper mold of the present invention are installed;

[0033] Figure 6 for Figure 5 Enlarged structural diagram at point C;

[0034] Figure 7 This is a schematic diagram of the limit block and mounting base structure;

[0035] Figure 8 for Figure 7 Enlarged structural diagram at point D;

[0036] Figure 9 This is a schematic diagram of the rotating plate and mounting base structure of the present invention;

[0037] Figure 10 for Figure 9Enlarged structural diagram at point E;

[0038] In the diagram: 100, frame; 200, lower mold base; 300, limiting block; 310, limiting space; 400, rotating plate; 110, upper mold; 210, side baffle; 410, first plate; 420, second plate; 320, shaft groove; 330, rotating shaft; 500, mounting base; 610, smooth rod; 620, screw; 411, magnetic block; 421, counterweight; 700, collecting component; 800, mounting frame; 810, fixed frame; 820, sliding frame. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0040] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0041] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0044] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] like Figures 1-10 The diagram illustrates a metal sheet bending machine according to an embodiment of the present invention, comprising a frame 100, a lower die base 200, a limiting block 300, and a rotating plate 400. The frame 100 adopts a conventional bending machine frame structure, consisting of a base, columns, and beams. The lower die base 200 is fixedly mounted on the base of the frame 100, and its shape is cuboid, with its length and width determined according to the actual size range of the sheet metal being processed. The limiting block 300 is either a cuboid or a right-angled trapezoid. If the limiting block 300 is a cuboid, its four sides are rounded to reduce wear between the bent part or the rotating plate 400 and the right-angled sides of the cuboid. A limiting space 310 is formed between the two cuboid limiting blocks 300. If the limiting block 300 is a right-angled trapezoid, the right-angled sides of the two limiting blocks 300 are far apart, while the hypotenuses are close together. Two right-angled trapezoidal limiting blocks 300 form a V-shaped limiting space 310. Similar to the prior art, the upper die 110 can press the bent part into the limiting space 310 to cause plastic deformation of the bent part, and finally realize the bending of the workpiece.

[0046] Two rotating plates 400 are provided, each rotatably mounted on one of the two limiting blocks 300. The rotating plates 400 are made of a material with a certain degree of elasticity and wear resistance. The rotating plates 400 ensure good support for the sheet material during bending and effectively separate the sheet material from the sidewalls of the limiting blocks 300. Furthermore, after the rotating plates 400 rotate around the top of the limiting blocks 300 and abut against the edges of the two limiting blocks 300, it is as if the rotating plates 400 have extended upwards along the edges of the limiting blocks 300 by a certain planar distance. This avoids pressure between the side of the upper die 110 and the top of the limiting blocks 300, thus preventing bending marks. The rotating plates 400 are rotatably mounted on the limiting blocks 300 via pins or shafts. One end of the limiting block 300 has a mounting hole adapted to the pin, and a corresponding hole of the same diameter is provided on one end of the rotating plate 400. The pin is inserted into the hole, allowing the rotating plates 400 to rotate flexibly around the pin.

[0047] Working Principle: In the supported state, there is a certain gap between the two limiting blocks 300. The rotating plate 400 is in contact with the top of the limiting blocks 300, and one end of the two rotating plates 400 is close to each other. When the upper die 110 presses down, the bending part squeezes the rotating plate 400. Since the rotating plate 400 can rotate around the pin, under the pressure of the bending part, the rotating plate 400 gradually rotates to the separated state. In the separated state, the sides of the limiting blocks 300 that are close to each other are in contact. At this time, the rotating plate 400 separates the bending part from the side wall of the limiting blocks 300, avoiding the compression between the top of the limiting blocks 300 and the upper die 110 from forming a bending mark on the workpiece. The upper die 110 continues to press down, causing the bending part to undergo plastic deformation within the limiting space 310 under the support of the rotating plate 400, completing the bending operation. After bending is completed, the upper die 110 is driven to move upward by the slider through the hydraulic system or the electronic control system, and the rotating plate 400 rotates back to the supported state. Then the bent workpiece is removed from the rotating plate 400.

[0048] By using the rotating plate 400, the use of bending paper is avoided, which not only effectively reduces the probability of safety accidents and improves the safety of the metal sheet bending process, but also eliminates the need for frequent bending paper replacements, reducing processing interruptions caused by bending paper changes and improving the working efficiency of the bending machine. This allows for more continuous and efficient metal sheet bending. The rotating plate 400 forms a plane between the bent part and the limiting block 300 through rotation, effectively creating an extended plane at the top of the upper die 110 and the original V-shaped bending groove. This prevents sudden pressure changes between the upper die 110 at the top of the limiting space 310 and the top of the original V-shaped bending groove, as well as pressure changes beyond the limiting space 310, which could lead to bending marks on the bent part. This improves the surface quality and aesthetics of the bent metal sheet, meeting the processing requirements of products with high appearance requirements, such as the outer panel of a power distribution cabinet.

[0049] Furthermore, after the rotating plate 400 rotates to abut against the top of the limiting block 300, the adjacent side edges of the two rotating plates 400 can connect, allowing the two rotating plates 400 to provide a stable support plane for the bent part. This facilitates stable contact between the bent part and the positioning back baffle on the bending machine, thereby ensuring the bending dimensions of the thin metal sheet. The contacting side edges of the two rotating plates 400 are located on the symmetrical plane of the two limiting blocks 300, ensuring that the two rotating plates 400 are symmetrical with respect to the centerline of the upper die 110. This ensures that the front ends of the two rotating plates 400 are always below the bending part of the workpiece, preventing the height difference between the two rotating plates 400 and the side walls of the limiting block 300 from causing bending marks on the metal sheet when the upper die 110 presses down on the workpiece.

[0050] Based on the thickness of the rotating plate 400, the adjacent edges of the rotating plate 400 can be set into an arc shape to avoid the two edges of the two rotating plates 400 intersecting affecting the rotation of the rotating plate 400.

[0051] Furthermore, side baffles 210 are provided on opposite sides of the lower mold base 200, and the two side baffles 210 are parallel to the length direction of the lower mold base 200. The side baffles 210 are connected to the lower mold base 200 by welding or high-strength bolts, and two limiting blocks 300 are located between the two side baffles 210. The rotating plate 400 has a first plate 410 and a second plate 420 that are perpendicular to each other. The first plate 410 is rotatably mounted on the limiting block 300, and the second plate 420 can rotatably fit against the outside of the side baffles 210, so that the side baffles 210 can position the rotating plate 400 through the second plate 420.

[0052] Working principle: During bending, the first plate 410 flips under the downward pressure of the upper die 110, thus abutting against the two limiting blocks 300 at their closest points. The second plate 420, initially in contact with the outer side of the side baffle 210, tilts upward. Since the first plate 410 is positioned between the bending component and the limiting blocks 300, it cannot fall under gravity. After the bending operation is complete and the upper die 110 rises away from the workpiece, the second plate 420, relying on gravity, provides the force for the first plate 410 to rotate towards the top of the limiting blocks 300. The rotating plate 400 automatically returns to its initial state of contact with the top of the limiting blocks 300. This automatic reset mechanism eliminates the need for manual intervention, greatly improving operational convenience and efficiency.

[0053] The two rotating plates 400 can abut against each other at one end of the first plate 410, which is away from the second plate 420. In the initial state, they together form a continuous and flat support plane.

[0054] Furthermore, a shaft groove 320 is provided on one side edge of the top of the limiting block 300, located on the side where the two limiting blocks 300 are close to each other, providing positioning space for the rotation shaft 330 of the rotating plate 400. The dimensions of the shaft groove 320 are precisely matched with the rotation shaft 330, ensuring that the rotation shaft 330 can be tightly embedded in the shaft groove 320 when the rotating plate 400 is installed, thus ensuring the accuracy and stability of the rotation shaft 330's position. This can be modified from a traditional ball-bearing lower mold, directly using the rollers of the ball-bearing lower mold as the rotation shaft 330 of the rotating plate 400, making the lower mold modification convenient, quick, and cost-effective.

[0055] Mounting base 500 is mounted on rotating shaft 330 and can be fixed to rotating shaft 330 by welding. To prevent deformation of rotating shaft 330, spot welding can be used for connection. Mounting base 500 can provide support for rotating plate 400. Mounting base 500 can be detachably connected to rotating plate 400. Compared to direct connection of rotating plate 400 to rotating shaft 330, this method is more convenient for replacing rotating plate 400 after a period of use.

[0056] Furthermore, the two limiting blocks 300 can slide synchronously within the lower die holder 200 and can move closer or further apart, allowing the limiting space 310 to be easily increased or decreased. In actual production, the required size of the limiting space 310 varies depending on the thickness and bending angle of the metal sheet. Operators can quickly adjust the size of the limiting space 310 by simply sliding the two limiting blocks 300 to accommodate various types of metal sheet bending. Compared to the traditional method of changing dies, the synchronous sliding adjustment of the two limiting blocks 300 saves time and improves processing efficiency.

[0057] To accommodate the sliding of the two limiting blocks 300, another implementation method is that the rotating plate 400 does not directly contact the rotating shaft 330, but is connected to the rotating shaft 330 through the mounting base 500. Specifically, the mounting base 500 can slide relative to the rotating plate 400. The rotating plate 400 is provided with a dovetail-shaped groove located on the side of the first plate 410 near the limiting plate. The mounting base 500 has a slider adapted to the dovetail groove. Under the action of the dovetail groove, the mounting base 500 can slide relative to the rotating plate 400 in the sliding direction of the limiting block 300, and after sliding, it moves closer to or further away from the second plate 420.

[0058] Working principle: When it is necessary to adjust the position of the two limit blocks 300, the two limit blocks 300 are driven to move closer or further apart by the driving component. The limit blocks 300 will drive the mounting base 500 to slide synchronously. The rotating plate 400 will remain in its original position due to the abutment between the second plate 420 and the outer wall of the side baffle 210, so that the end of the first plate 410 away from the second plate 420 is always located on the symmetrical plane of the two limit blocks 300.

[0059] One feasible implementation involves a locking element between the two rotating plates 400. This locking element can be in the form of a hook. When the first plates 410 of the two rotating plates 400 rotate closer together, they hook together, preventing the two rotating plates 400 from moving as the two limiting blocks 300 slide away from each other. When the two limiting blocks 300 approach each other, the second plate 420 abuts against the side baffle 210, preventing the rotating plates 400 from sliding along with the limiting blocks 300.

[0060] Through the synchronous sliding mechanism of the limit block 300, operators can quickly and accurately adjust the size of the limit space 310 to adapt to the processing needs of thin metal sheets with different thicknesses and bending angles. Compared with the traditional method of changing molds, this greatly saves adjustment time, significantly improves processing efficiency, and enables the equipment to more flexibly cope with diverse production tasks.

[0061] The sliding structure design of the mounting base 500 and the rotating plate 400 ensures the positional stability of the rotating plate 400 during the adjustment of the limiting block 300. Combined with the fit between the second plate 420 and the outer wall of the side baffle 210, and using the outer wall of the side baffle 210 as a reference, the end of the first plate 410 furthest from the second plate 420 is always located on the symmetrical plane of the two limiting blocks 300, providing stable support and a stable positioning foundation for the bending process. This structure, working in conjunction with the synchronous sliding mechanism of the limiting block 300, enhances the overall stability and reliability of the equipment, ensuring accurate completion of bending operations under various working conditions and improving bending quality.

[0062] refer to Figure 3 and Figure 5 In some embodiments, the sheet metal bending machine further includes a guide rod 610 and a screw 620. There are two or more guide rods 610, the specific number is not limited, and multiple guide rods 610 are all disposed on the lower die base 200 and pass through the limiting block 300. The presence of the guide rod 610 provides a track for the limiting block 300, restricting the sliding direction of the limiting block 300. The guide rod 610 fits tightly with the through hole on the limiting block 300, providing guidance for the limiting block 300 and preventing deviation, shaking, or jamming during sliding. This ensures that the limiting block 300 can maintain stable and accurate movement when adjusting the spacing, thereby improving the accuracy of the dimensional adjustment of the limiting space 310.

[0063] The screw 620 is rotatably mounted on the lower mold base 200. Its center is connected to the lower mold base 200 via a bearing, and both ends are fixed by bearing seats to ensure the stability of the screw 620 during rotation. The screw 620 has a first section and a second section with opposite thread directions. The lengths of the first and second sections are determined according to the stroke of the limiting block 300 and the spatial layout of the lower mold base 200. Generally, the lengths are similar and can meet the adjustment of the limiting block 300 within its maximum stroke range. The two limiting blocks 300 are respectively machined with threaded holes that are adapted to the threads of the first and second sections of the screw 620. When the screw 620 rotates, because the threads are opposite in direction, the two limiting blocks 300 will simultaneously move closer to or further away from each other along the axial direction of the screw 620.

[0064] The structural design of the guide rod 610 and the screw 620 enhances the stability of the limiting block 300 during the bending process. The guide rod 610 restricts the lateral displacement of the limiting block 300, and the screw 620 provides stable drive, ensuring that the limiting block 300 does not wobble or shift when subjected to the downward pressure of the upper die 110 and the bending force of the sheet metal. This guarantees the stability and reliability of the bending process, thereby improving bending accuracy and contributing to the production of high-quality sheet metal products.

[0065] Furthermore, without using additional locking components, another feasible method is to include magnetic blocks 411. The magnetic blocks 411 are made of a magnetic material, and the number of magnetic blocks 411 is determined based on the size of the rotating plate 400 and the required suction force, generally between 2 and 4, evenly distributed at the ends of the two first plates 410 furthest from the second plate 420. During installation, grooves matching the shape of the magnetic blocks 411 are machined at corresponding positions on the rotating plate 400. The magnetic blocks 411 are then embedded into the grooves and fixed using high-strength adhesive or spot welding to ensure they do not fall off during operation.

[0066] The magnetic force of the magnetic block 411 needs to be calculated and tested to ensure that the two rotating plates 400 can be firmly attracted together before the bending operation, maintaining a flat support surface, and preventing the two limiting blocks 300 from moving away from each other due to the friction between the mounting base 500 and the rotating plates 400. Furthermore, after the rotating plates 400 rotate to the state where the first plate 410 contacts the top surface of the limiting block 300, the magnetic block 411 can also cause the first plate 410 of the two rotating plates 400 to move closer together and return to the support state.

[0067] When the rotating plate 400 rotates to the separated state, the first plate 410 may slide downwards due to gravity. At this time, the edges of the first plates 410 of the two rotating plates 400 approach each other near the bottom of the limiting block 300, and the magnetic blocks 411 on the two rotating plates 400 begin to interact. To prevent the weight of the second plate 420 from being unable to overcome the attraction between the magnetic blocks 411, thus preventing the rotating plate 400 from returning to the supported state, a counterweight 421 can be added to the second plate 420. The weight of the counterweight 421 and the second plate 420 should be sufficient to overcome the attraction between the magnetic blocks 411.

[0068] The counterweight 421 is fixed to the second plate 420 of the rotating plate 400 by bolts or welding. The weight of the counterweight 421 is selected according to the attraction of the magnetic block 411. This prevents the first plate 410 of the rotating plate 400 from rotating to a state where it is close to the end of the limiting block 300. Due to the action of the magnetic block 411, the gravity of the second plate 420 alone cannot make the first plate 410 rotate back to a state where it is in contact with the top of the limiting block 300.

[0069] To further reduce the collision noise between the second plate 420 and the side baffle 210, a nylon plate with a material that can be connected to the side wall of the limiting block 300 by means of countersunk bolts can be used to reduce the collision noise between the second plate 420 and the side baffle 210.

[0070] refer to Figure 2 and Figure 6In some embodiments, the sheet metal bending machine also includes a collecting component 700. The collecting component 700 can be made in two ways: First, it can be made of a flexible, high-temperature resistant, wear-resistant material with a certain degree of flexibility, such as aramid fiber cloth or silicone, allowing it to adapt to changes in the distance between the two limiting blocks 300. The two ends of the collecting component 700 are respectively connected to the two limiting blocks 300 by adhesive fasteners, which facilitates disassembly. Second, the collecting component 700 can be made of a rigid material, fixed to the side baffle 210 and passing through or sleeved on the limiting blocks 300, so that the collecting component 700 remains fixed when the limiting blocks 300 slide.

[0071] The collecting component 700 is located between the top of the limiting block 300 and the guide rod 610. It can catch the metal debris that falls from the bent part due to bending, and prevent the metal debris from accumulating on the guide rod 610 and the screw 620 for a long time, which would affect the moving accuracy of the limiting block 300.

[0072] Furthermore, the length of the rotating plate 400 is greater than the length of the limiting block 300, allowing the mounting base 500 to connect to the rotating plate 400 from both ends of the limiting block 300. This prevents the first plate 410 of the rotating plate 400 from failing to align with the top of the limiting block 300 due to the presence of the mounting base 500. The rotating shaft 330 of the rotating plate 400 extends out of the shaft groove 320 along its length, facilitating the connection between the rotating plate 400 and the mounting base 500. Threaded holes are machined at both ends of the rotating shaft 330, enabling a reliable connection between the rotating plate 400 and the mounting base 500 using fasteners.

[0073] The mounting base 500 has through holes at the threaded hole positions at both ends of the rotating shaft 330 of the rotating plate 400. The diameter of the through hole is slightly larger than the outer diameter of the fastener, generally 0.5-1mm larger, to allow the fastener to pass through smoothly. The shape and size of the mounting base 500 are designed according to the layout of the rotating plate 400 and the limiting block 300. Its main function is to provide auxiliary support for the rotating plate 400 and to move synchronously with the rotating plate 400 when the limiting block 300 slides.

[0074] Another specific implementation is that the part of the rotating shaft 330 extending out of the shaft groove 320 is fixedly sleeved by the mounting base 500. Specifically, it can be connected by a key connection. Then, the mounting base 500 has a flat surface, and a slider that matches the groove on the rotating plate 400 protrudes from the flat surface. The slider is located in the groove of the rotating plate 400. The flat surface on the mounting base 500 abuts against the rotating plate 400. By sliding the rotating plate 400, the mounting base 500 can be disengaged from the groove in a direction away from the second plate 420. Conversely, the connection between the mounting base 500 and the rotating plate 400 can be completed, thereby facilitating the replacement of the rotating plate 400.

[0075] refer to Figure 1 and Figure 2 In some embodiments, the sheet metal bending machine further includes a mounting frame 800, which includes a fixed frame 810 and a sliding frame 820. The fixed frame 810 can stably support the entire mounting frame 800 and the lower die base 200. The fixed frame 810 has an L-shaped block structure, which, together with the sliding frame 820 slidably disposed on the fixed frame 810, forms a clamping space. The lower die base 200 has a fixing protrusion, which can be placed in the clamping space. The fixing protrusion can be clamped by the sliding frame 820 sliding close to the fixed frame 810.

[0076] The sliding member can be bolted to the fixing bracket 810 to form a structure that can securely fix the protrusion.

[0077] The sliding design of the sliding frame 820 on the fixed frame 810 and the adjustable clamping structure make the installation and disassembly of the lower mold base 200 more convenient and quick. Operators can quickly change the lower mold base 200 according to different processing requirements.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A metal sheet bending machine, comprising a frame (100) and an upper die (110) and a lower die disposed on the frame (100), characterized in that, The lower mold includes: The lower mold base (200) is mounted on the frame (100); Two limiting blocks (300) are provided, and both limiting blocks (300) are slidably disposed on the lower die base (200). A limiting space (310) is formed between the two limiting blocks (300) so that the upper die (110) can move down and press the bending part against the limiting space (310). The two limiting blocks (300) can slide towards each other or slide away from each other in the lower die base (200) to adjust the width of the limiting space (310). Two rotating plates (400) are rotatably mounted on two limiting blocks (300) in a one-to-one correspondence. The two rotating plates (400) have a supporting state and a separating state. When the two rotating plates (400) are in the supporting state, the two rotating plates (400) together form a supporting surface for supporting the bent part. When the two rotating plates (400) are in the separating state, the two rotating plates (400) can rotate to the side wall adjacent to the two limiting blocks (300) respectively to abut against each other when the upper die (110) presses down on the bent part, so as to separate the bent part from the limiting block (300). The top of the limiting block (300) is provided with a shaft groove (320), and the rotating plate (400) is rotatably disposed in the shaft groove (320) via a rotating shaft (330). A mounting seat (500) is provided on the rotating shaft (330), and the mounting seat (500) is used to connect the rotating plate (400) and the rotating shaft (330). The mounting seat (500) can slide relative to the rotating plate (400) in the sliding direction of the limiting block (300). The rotating plate (400) has a first plate (410) and a second plate (420) arranged at an angle. The first plate (410) is rotatably mounted on the limiting block (300). The lower mold base (200) is provided with a side baffle (210) located outside the limiting block (300). When the two limiting blocks (300) slide toward each other, the side baffle (210) is used to limit the second plate (420) so that the limiting block (300) slides relative to the second plate (420), and further includes: A magnetic block (411) is disposed on the side edge of the first plate (410) away from the second plate (420) so that the first plates (410) of the two rotating plates (400) can attract each other.

2. A metal sheet bending machine according to claim 1, characterized in that, After the rotating plate (400) rotates to contact the top surface of the limiting block (300), the adjacent side edges of the two rotating plates (400) can connect, and the contact edges of the two rotating plates (400) are located on the plane of symmetry with the two limiting blocks (300).

3. A metal sheet bending machine according to claim 2, characterized in that, The second plate (420) can rotate under its own weight to abut against the side baffle (210) and drive the first plate (410) to rotate to contact the top surface of the limiting block (300), so that the first plate (410) of the two rotating plates (400) forms the support surface.

4. A metal sheet bending machine according to claim 3, characterized in that, Also includes: A light rod (610) is disposed on the lower mold base (200), the light rod (610) passes through the limiting block (300), and the light rod (610) is used to limit the sliding direction of the limiting block (300); The screw (620) is rotatably mounted on the lower mold base (200). The screw (620) has a first section and a second section with opposite thread directions. The two limiting blocks (300) are threadedly connected to the first section and the second section respectively, so that the screw (620) can drive the two limiting blocks (300) to move closer or further away from each other.

5. A metal sheet bending machine according to claim 4, characterized in that, Also includes: A collection element (700) is disposed between the two limiting blocks (300) and is disposed above the light rod (610). The collection element (700) is used to collect the debris generated by bending the bent part.

6. A metal sheet bending machine according to claim 3, characterized in that, Both ends of the rotating plate (400) protrude outward from the limiting block (300), both ends of the rotating shaft (330) protrude outward from the shaft groove (320), both ends of the rotating shaft (330) have threaded holes, and the mounting base (500) has through holes for fasteners to pass through so that the fasteners are threadedly connected to the threaded holes.

7. A metal sheet bending machine according to claim 1, characterized in that, It also includes a mounting bracket (800) for mounting the lower mold base (200), the mounting bracket (800) comprising: A mounting bracket (810) is provided on the frame (100); A sliding frame (820) is slidably disposed on the fixed frame (810). The sliding frame (820) can slide close to the fixed frame (810) so that the sliding frame (820) and the fixed frame (810) can clamp the lower mold base (200).

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