Metal sheet bending machine

Abstract

The invention relates to the technical field of bending equipment, and provides a metal sheet part bending machine which comprises a rack, and a lower die holder is arranged on the rack; the number of the limiting blocks is two, the two limiting blocks are both arranged on the lower die base, and a limiting space is formed between the two limiting blocks so that the upper die can press a workpiece into the limiting space. The number of the rotating plates is two, the two rotating plates are rotationally arranged on the two limiting blocks in a one-to-one correspondence mode, the two rotating plates can rotate to abut against the tops of the two limiting blocks or abut against the ends, close to each other, of the two limiting blocks correspondingly, and the rotating plates are configured to be used for supporting the bent part. The rotating plate can separate the bending piece from the limiting block, plane transition of the bending piece and the limiting block at the top of the limiting space is achieved, bending marks are avoided, and the problem that in the prior art, when a bending machine is used for avoiding the bending marks, the bending piece is damaged is solved. On one hand, safety accidents are prone to occurring, and bent paper needs to be replaced frequently.

Description

Technical Field

[0001] The present invention relates to the technical field of bending equipment, and in particular to a metal sheet bending machine. Background Art

[0002] A press brake is a device that bends metal sheets into specific angles or shapes through mechanical pressure. The press brake drives the slider through a hydraulic system or an electronic control system to move the upper die downward, contacting the sheet fixed on the lower die, and then squeezes the sheet to produce plastic deformation to achieve bending.

[0003] In the prior art, the lower die is usually V-shaped, and V-shaped seats of different sizes are selected for different sheet thicknesses. When bending, after the upper die presses the sheet into the V-shaped die seat, the bottom of the upper die's pressing blade has an inverted triangular cross-section. As the pressing blade is pressed into the V-shaped die seat, the upper die's pressing blade and the side walls of the lower die's opening easily squeeze the sheet to form 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, and the appearance of bending marks affects the appearance. Currently, bending paper or a markless bending die is usually 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 the formation of bending marks. However, when using bending paper, the bending paper is subject to wear and tear, and needs to be replaced after several uses, which can easily slow down the overall processing efficiency. A markless bending die is a die that converts the lower die into two flip plate shaft seats. When the upper die squeezes the bent part, the two flip shaft seats will rotate with the two sides of the bent part, thereby avoiding the formation of bending marks. However, in actual use, the cost of seamless bending molds is high. Different sizes of V-shaped seats are required for different thicknesses of sheet metal. Since the two flip plate shaft seats are fixed in position, the same seamless bending mold cannot be used to bend sheets of different thicknesses. When bending sheets of different thicknesses, the corresponding molds need to be replaced, which affects the bending efficiency and the purchase cost of the bending machine. Summary of the Invention

[0004] To overcome the above-mentioned defects, an embodiment of the present invention provides a metal sheet bending machine, which solves the technical problem in the prior art that the seamless bending mold cannot be applied to plates of different thicknesses.

[0005] According to one aspect, at least one embodiment of the present invention provides a sheet metal bending machine, comprising a frame and an upper die and a lower die disposed on the frame, wherein the lower die comprises: A lower die base is arranged on the frame; There are two limit blocks, both of which are arranged on the lower die base, and a limit space is formed between the two limit blocks, so that the upper die can move downward and press the bending part to the limit space; There are two rotating plates, and the two rotating plates are rotatably arranged on the two limit blocks in a one-to-one manner. The two rotating plates have a supporting state and a separating state. When the two rotating plates are in the supporting state, the two rotating plates jointly form a supporting surface for supporting the bending part. When the two rotating plates are in the separating state, the two rotating plates can be rotated to the side walls adjacent to the two limit blocks when the upper mold presses down the bending part to separate the bending part and the limit blocks.

[0006] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, after the rotating plate rotates to contact the top surface of the limit 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 symmetrical plane with the two limit blocks.

[0007] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, the rotating plate has a first plate and a second plate set at an angle, the first plate is rotatably set on the limit block, and the lower die base is provided with a side baffle located on the outside of the limit block, and the second plate can rotate under the action of its own gravity to abut against the side baffle and drive the first plate to rotate to contact the top surface of the limit block, so that the first plates of the two rotating plates form the support surface.

[0008] For example, in a sheet metal bending machine provided by at least one embodiment of the present invention, the top of the limit block has an axis groove, the axis grooves of the two limit blocks are located on the side where the two limit blocks are close to each other, and the rotating plate is rotatably disposed in the axis groove via a rotating shaft, further comprising: The mounting seat is arranged on the rotating shaft, and the mounting seat is used to support the rotating plate so that the rotating plate is rotatably arranged on the limiting block.

[0009] For example, in a metal sheet bending machine provided by at least one embodiment of the present invention, the mounting seat is slidably connected to the rotating plate, and the two limit blocks can slide toward each other or away from each other in the lower die seat to adjust the width of the limit space.

[0010] For example, at least one embodiment of the present invention provides a sheet metal bending machine, further comprising: a polished rod, disposed on the lower die base, the polished rod passing through the limit block, and used to limit the sliding direction of the limit block; A screw is rotatably arranged on the lower die base, and the screw has a first section and a second section with opposite thread rotation directions. The two limit blocks are respectively threadedly connected to the first section and the second section so that the screw can drive the two limit blocks to move closer to or away from each other.

[0011] For example, in a sheet metal bending machine provided by at least one embodiment of the present invention, when the two limit blocks slide toward each other, the side baffle is used to limit the second plate so that the limit blocks slide relative to the second plate, and further includes: The magnetic block is arranged on a side edge of the first plate away from the second plate, so that the first plates of the two rotating plates can be attracted to each other.

[0012] For example, at least one embodiment of the present invention provides a sheet metal bending machine, further comprising: A collecting piece is arranged between the two limit blocks and is arranged higher than the polished rod. The collecting piece is used to collect debris generated by the bending of the bending piece.

[0013] 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 limit block setting, both ends of the rotating shaft protrude from the shaft groove setting, both ends of the rotating shaft have threaded holes, and the mounting seat has a through hole, and the through hole is used for a fastener to pass through so that the fastener is threadedly connected to the threaded hole.

[0014] For example, in at least one embodiment of the present invention, a sheet metal bending machine further includes a mounting frame for mounting the lower die base, the mounting frame including: A fixing frame, arranged on the frame; The sliding frame is slidably arranged 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.

[0015] The beneficial effects of the present invention are: In the present invention, the use of bending paper is avoided by rotating the plate, which not only effectively reduces the probability of safety accidents, but also improves the safety of the metal sheet bending process. In addition, there is no need to frequently replace the bending paper, which reduces the processing interruption time caused by replacing the bending paper, improves the working efficiency of the bending machine, and enables the bending process of the metal sheet to be carried out more continuously and efficiently. The rotating plate forms a plane between the bending part and the limit block by rotating, avoiding the pressure of the upper mold at the top of the limit space and the top of the original V-shaped bending groove causing bending marks on the bending part, improving the surface quality and aesthetics of the metal sheet after bending, and meeting the processing requirements of products with high appearance requirements such as the outer panel of the distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A in the middle is an enlarged structural diagram; Figure 3 This is a schematic diagram of the structure of the present invention after the frame and upper mold are hidden; Figure 4 for Figure 3 The enlarged structural diagram at B in the middle; Figure 5 This is a schematic diagram of the structure of another state after the frame and the upper mold are hidden; Figure 6 for Figure 5 The enlarged structural diagram at C in the middle; Figure 7 It is a schematic diagram of the limit block and mounting seat structure; Figure 8 for Figure 7 The enlarged structural diagram at D in the middle; Figure 9 This is a schematic diagram of the structure of the rotating plate and the mounting base of the present invention; Figure 10 for Figure 9 The enlarged structural diagram at E in the middle; In the figure: 100, frame; 200, lower die base; 300, limit block; 310, limit space; 400, rotating plate; 110, upper die; 210, side baffle; 410, first plate; 420, second plate; 320, shaft groove; 330, rotating shaft; 500, mounting seat; 610, polished rod; 620, screw; 411, magnetic block; 421, counterweight; 700, collecting piece; 800, mounting frame; 810, fixed frame; 820, sliding frame. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0019] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0020] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0021] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0022] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply 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 understood as a limitation on the present invention.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] like Figures 1 to 10As shown, a metal sheet bending machine in one embodiment of the present invention includes a frame 100, a lower die base 200, a limit block 300 and a rotating plate 400. The frame 100 adopts the bending machine frame structure in the prior art and is composed of a base, a column and a crossbeam. The lower die base 200 is fixedly mounted on the base of the frame 100 and is in the shape of a rectangular parallelepiped. The length and width are determined according to the size range of the actual processed plate. The limit block 300 is a rectangular parallelepiped or a right-angled trapezoid. If the limit block 300 is a rectangular parallelepiped, the four edges of the limit block 300 are rounded to reduce the wear of the bending part or the rotating plate 400 and the right-angled edges of the rectangular parallelepiped. A limit space 310 is formed between the two rectangular limit blocks 300. If the limit block 300 is a right-angled trapezoid, the right-angled edges of the two limit blocks 300 are away from each other, and the oblique edges are close to each other. The 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 bending part into the limiting space 310 to cause the bending part to undergo plastic deformation, thereby finally achieving bending of the workpiece.

[0025] There are two rotating plates 400, which are rotatably mounted on the two limit blocks 300 in a one-to-one correspondence. The rotating plates 400 are made of a material with a certain degree of elasticity and wear resistance. The rotating plates 400 can not only ensure good support for the plate during the bending process, but also effectively separate the plate from the side walls of the limit blocks 300. Moreover, after the rotating plates 400 rotate around the top of the limit blocks 300 and abut against the edges of the two limit blocks 300 that are close to each other, it is equivalent to the rotating plates 400 extending upward along the edges of the limit blocks 300 by a certain distance in the plane, thereby avoiding the side of the upper mold 110 and the top of the limit blocks 300 from being squeezed, thereby avoiding the formation of bending marks. The rotating plates 400 are rotatably mounted on the limit blocks 300 via a pin or a rotating shaft. A mounting hole adapted to the pin is provided at one end of the limit block 300, and a hole of the same diameter is provided at a corresponding position at one end of the rotating plate 400. The pin is inserted into the hole, allowing the rotating plates 400 to flexibly rotate around the pin.

[0026] Working Principle: In the supported state, there is a certain gap between the two limit blocks 300. The rotating plate 400 is in contact with the top of the limit blocks 300, and one end of the two rotating plates 400 is close to each other. When the upper mold 110 presses down, the bending part squeezes the rotating plates 400. Because the rotating plates 400 can rotate around the pin, under the pressure of the bending part, the rotating plates 400 gradually rotate to the separated state. In the separated state, the sides of the limit blocks 300 that are close to each other abut each other. At this time, the rotating plates 400 separate the bending part and the side walls of the limit blocks 300, preventing the pressure between the top of the limit blocks 300 and the upper mold 110 from forming bending marks on the workpiece. The upper mold 110 continues to press down, causing the bending part to undergo plastic deformation within the limited space 310 under the support of the rotating plates 400, completing the bending operation. After bending is completed, the hydraulic system or the electronic control system drives the slider to move the upper mold 110 upward, and the rotating plates 400 rotate back to the supported state. The bent workpiece is then taken out from the rotating plate 400 .

[0027] By rotating the plate 400, the use of bending paper is avoided, which not only effectively reduces the probability of safety accidents, but also improves the safety of the metal sheet bending process. In addition, there is no need to frequently replace the bending paper, which reduces the processing interruption time caused by replacing the bending paper, improves the working efficiency of the bending machine, and enables the bending process of the metal sheet to be carried out more continuously and efficiently. The rotating plate 400 forms a plane between the bending part and the limit block 300 by rotating, which is equivalent to forming an extension plane between the upper mold 110 and the top of the original V-shaped bending groove, avoiding the pressure of the upper mold 110 at the top of the limit space 310 and the top of the original V-shaped bending groove, as well as the sudden change of pressure in the part beyond the limit space 310, which causes the bending part to produce bending marks. The surface quality and aesthetics of the metal sheet after bending are improved, meeting the processing requirements of products with high appearance requirements such as the outer panel of the distribution cabinet.

[0028] Furthermore, after the rotating plates 400 rotate to abut against the top of the limit block 300, the adjacent side edges of the two rotating plates 400 can be connected, so that the two rotating plates 400 can provide a stable support plane for the bending part, which is conducive to the stable contact between the bending part and the positioning rear baffle on the bending machine, thereby ensuring the bending size of the metal sheet. The side edges of the two rotating plates 400 that contact each other are located on the symmetry planes of the two limit blocks 300, which can make the two rotating plates 400 symmetrical relative to the center line of the upper mold 110, so that the front ends of the two rotating plates 400 are always located below the bending part of the workpiece, avoiding the height difference between the two rotating plates 400 and the side walls of the limit block 300 when the upper mold 110 presses the workpiece downward, which will cause bending marks on the metal sheet.

[0029] According to the thickness of the rotating plate 400 , the adjacent edges of the rotating plate 400 may be configured to be arc-shaped to prevent the two adjacent edges of the two rotating plates 400 from affecting the rotation of the rotating plate 400 .

[0030] Furthermore, side guards 210 are provided on opposite sides of the lower die base 200, parallel to the length of the lower die base 200. The side guards 210 are connected to the lower die base 200 by welding or high-strength bolts, with two stoppers 300 positioned between the side guards 210. The rotating plate 400 comprises a first plate 410 and a second plate 420, which are perpendicular to each other. The first plate 410 is rotatably mounted on the stoppers 300, while the second plate 420 is rotatably attached to the outer side guards 210, allowing the side guards 210 to position the rotating plate 400 via the second plate 420.

[0031] Working Principle: When bending, the first plate 410 can be flipped by the bending member during the downward pressure of the upper mold 110, thereby abutting against the end of the two limit blocks 300 that are close to each other. The second plate 420 tilts upward from the state of being in contact with the outer side of the side guard 210. Since the first plate 410 is between the bending member and the limit block 300 at this time, the second plate 420 cannot fall under the action of gravity. When the bending operation is completed and the upper mold 110 rises and leaves the workpiece, the rotating plate 400 automatically returns to its initial state of abutting against the top of the limit block 300 because the second plate 420 can rely on gravity to provide the force for the first plate 410 to rotate closer to the top of the limit block 300. This automatic reset mechanism eliminates the need for manual intervention by the operator, greatly improving the convenience and efficiency of operation.

[0032] The ends of the first plates 410 of the two rotating plates 400 away from the second plate 420 can abut against each other. In the initial state, they together form a continuous and flat supporting plane.

[0033] Furthermore, an axis groove 320, located on one edge of the top of each stop block 300 and positioned near the two stop blocks 300, provides positioning space for the rotation axis 330 of the rotating plate 400. The dimensions of the axis groove 320 precisely match the rotation axis 330. When the rotating plate 400 is installed, the rotation axis 330 fits snugly within the axis groove 320, ensuring the accuracy and stability of the position of the rotation axis 330. This can be modified from a conventional ball-bearing lower mold, directly using the roller of the ball-bearing lower mold as the rotation axis 330 of the rotating plate 400. This makes lower mold modification quick and easy, and inexpensive.

[0034] The mounting base 500 is mounted on the rotating shaft 330 and can be secured to the rotating shaft 330 by welding. Spot welding can be used to prevent deformation of the rotating shaft 330. The mounting base 500 provides support for the rotating plate 400 and can be detachably connected to the rotating plate 400. This makes it easier to replace the rotating plate 400 after a period of use, compared to directly connecting the rotating plate 400 to the rotating shaft 330.

[0035] Furthermore, the two limit blocks 300 can slide synchronously within the lower die base 200 and can move closer to or further away from each other, which allows the limit space 310 to be easily increased or decreased. In actual production, the limit spaces 310 required for sheet metal parts of different thicknesses and different bending angles vary in size. The operator can quickly adjust the size of the limit space 310 to accommodate various types of sheet metal bending simply by sliding the two limit blocks 300. Compared with the traditional method that requires replacing the mold, the synchronous sliding adjustment method of the two limit blocks 300 saves more time and helps improve processing efficiency.

[0036] To accommodate the sliding movement of the two limit blocks 300, another embodiment is that the rotating plate 400 does not directly contact the rotating shaft 330, but instead connects the rotating plate 400 and the rotating shaft 330 via a 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 slot located on the side of the first plate 410 near the limit plate. The mounting base 500 has a slider that matches the dovetail slot. Under the action of the dovetail slot, the mounting base 500 can slide relative to the rotating plate 400 in the sliding direction of the limit blocks 300, and after sliding, it moves closer to or away from the second plate 420.

[0037] Working principle: When the positions of the two limit blocks 300 need to be adjusted, the two limit blocks 300 are driven closer to or away from each other by the driving member, and the limit blocks 300 will drive the mounting base 500 to slide synchronously, while 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.

[0038] One possible implementation is to provide a locking member between the two rotating plates 400. The locking member can be in the form of a hook. When the first plates 410 of the two rotating plates 400 rotate toward each other, they can hook together to prevent the two rotating plates 400 from moving when the two limit blocks 300 slide away from each other. When the two limit blocks 300 move toward each other, due to the abutment between the second plate 420 and the side guard 210, the side guard 210 can prevent the rotating plates 400 from sliding along with the limit blocks 300 by blocking the second plate 420.

[0039] The synchronized sliding mechanism of the limit block 300 allows operators to quickly and precisely adjust the size of the limit space 310 to accommodate the processing requirements of sheet metal parts with varying thicknesses and bending angles. Compared to traditional mold replacement methods, this significantly reduces adjustment time and significantly improves processing efficiency, enabling the equipment to more flexibly handle diverse production tasks.

[0040] 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 limit block 300. Combined with the contact between the second plate 420 and the outer wall of the side plate 210, 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, based on the outer wall of the side plate 210, providing stable support and positioning during the bending process. This structure works in conjunction with the synchronous sliding mechanism of the limit block 300 to enhance the overall stability and reliability of the equipment, ensuring accurate bending operations under various working conditions and improving bending quality.

[0041] refer to Figure 3 and Figure 5 In some embodiments, the metal sheet bending machine further includes a polished rod 610 and a screw 620. There are more than two polished rods 610, and the specific number is not limited. The multiple polished rods 610 are all arranged on the lower die base 200 and pass through the limit block 300. The existence of the polished rod 610 paves a track for the limit block 300, limiting the sliding direction of the limit block 300. The polished rod 610 is tightly matched with the perforation on the limit block 300, providing a guiding effect for the limit block 300, avoiding the limit block 300 from offsetting, shaking or jamming during the sliding process, so that the limit block 300 can always maintain stable and accurate movement when adjusting the spacing, thereby improving the accuracy of the size adjustment of the limit space 310.

[0042] The screw 620 is rotatably mounted on the lower die base 200. Its center is connected to the lower die base 200 via a bearing, and its two ends can be 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 rotation directions. The lengths of the first section and the second section are determined according to the stroke of the limit block 300 and the spatial layout of the lower die base 200. Generally, the lengths are similar and can meet the adjustment requirements of the limit block 300 within the maximum stroke range. The two limit blocks 300 are respectively machined with threaded holes that are compatible with the threads of the first and second sections of the screw 620. When the screw 620 rotates, due to the opposite thread rotation directions, the two limit blocks 300 will simultaneously approach or move away from each other along the axial direction of the screw 620.

[0043] The structural design of the polished rod 610 and screw 620 enhances the stability of the stopper 300 during the bending process. The polished rod 610 limits the lateral displacement of the stopper 300, while the screw 620 provides stable drive. This prevents the stopper 300 from shaking or shifting when subjected to the downward pressure of the upper mold 110 and the bending force of the sheet metal. This ensures the stability and reliability of the bending process, thereby improving bending accuracy and contributing to the production of high-quality sheet metal products.

[0044] Furthermore, without using additional locking members, another possible implementation is to also include magnetic blocks 411. Magnetic blocks 411 are made of a magnetic material. The number of magnetic blocks 411 is determined by the size of the rotating plate 400 and the required suction force, typically between 2 and 4, evenly distributed on the ends of the two first plates 410 away from the second plate 420. During installation, grooves matching the shape of the magnetic blocks 411 are machined in corresponding locations on the rotating plate 400. The magnetic blocks 411 are then inserted into the grooves and secured with high-strength glue or spot welding to prevent them from falling off during operation.

[0045] The suction force of the magnetic block 411 must be calculated and tested to ensure that the two rotating plates 400 are firmly attracted together before the bending operation, maintaining a flat support surface and preventing the two rotating plates 400 from moving away from each other due to the friction between the mounting base 500 and the rotating plate 400. Furthermore, the magnetic block 411 can ensure that the suction force between the two rotating plates 400 can bring the first plates 410 of the two rotating plates 400 closer together and return to the supported state after the rotating plates 400 rotate to a state where the first plates 410 contact the top surfaces of the limiting blocks 300.

[0046] When the rotating plates 400 rotate to the separated state, the first plates 410 may slide downward 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 limit block 300, and the magnetic blocks 411 on the two rotating plates 400 begin to interact with each other. To prevent the gravity of the second plates 420 from being unable to overcome the attraction between the magnetic blocks 411, resulting in the rotating plates 400 being unable to return to the supported state, a counterweight 421 can be added to the second plates 420. The gravity of the counterweight 421 and the second plates 420 should be sufficient to overcome the attraction between the magnetic blocks 411.

[0047] The counterweight block 421 is fixed to the second plate 420 of the rotating plate 400 by bolt connection or welding. The weight of the counterweight block 421 is selected according to the suction force of the magnetic block 411 to prevent the first plate 410 of the rotating plate 400 from rotating to abutting the end close to the limit block 300 due to the action of the magnetic block 411. As a result, the first plate 410 cannot be rotated back to a state of abutting the top of the limit block 300 by relying solely on the gravity of the second plate 420.

[0048] As a further effect, in order to reduce the collision noise between the second plate 420 and the side baffle 210 , a nylon plate can be connected to the side wall of the limit block 300 through countersunk bolts to reduce the collision noise between the second plate 420 and the side baffle 210 .

[0049] refer to Figure 2 and Figure 6In some embodiments, the sheet metal bending machine further includes a collecting member 700. The collecting member 700 can be made in two ways. One way is that the collecting member 700 is made of a flexible material that is resistant to high temperatures, wear-resistant, and has a certain degree of flexibility, such as aramid fiber cloth or silicone material, so that the collecting member 700 can adapt to the change in the distance between the two limit blocks 300. The two ends of the collecting member 700 are respectively connected to the two limit blocks 300 by bonding. The bonding can be made of nylon Velcro to facilitate the disassembly of the collecting member 700. Another way is that the collecting member 700 is made of a hard material, fixed to the side baffle 210 and passing through or sleeved on the limit block 300, so that when the limit block 300 slides, the collecting member 700 can remain fixed.

[0050] The collecting member 700 is located between the top of the limit block 300 and the polished rod 610 , and can receive the metal debris dropped by the bending part due to bending, thereby preventing the metal debris from accumulating on the polished rod 610 and the screw 620 for a long time and affecting the movement accuracy of the limit block 300 .

[0051] Furthermore, the length of the rotating plate 400 is greater than that of the stop block 300, allowing the mounting base 500 to connect to the rotating plate 400 from both ends of the stop block 300. This prevents the first plate 410 of the rotating plate 400 from being unable to mate with the top of the stop 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 the length of the shaft groove 320, which facilitates the connection between the rotating plate 400 and the mounting base 500. Threaded holes are machined at both ends of the rotating shaft 330, allowing the rotating plate 400 to be securely connected to the mounting base 500 using fasteners.

[0052] The mounting base 500 is provided with through-holes corresponding to the threaded holes at either end of the rotating plate 400's rotating shaft 330. The diameter of the through-holes is slightly larger than the outer diameter of the fastener, typically 0.5-1 mm larger, to facilitate smooth penetration of the fastener. The shape and size of the mounting base 500 are designed based on the layout of the rotating plate 400 and the stop block 300. Its primary function is to provide auxiliary support for the rotating plate 400 and to synchronize its relative movement with the rotating plate 400 as the stop block 300 slides.

[0053] Another specific implementation method is that the part of the rotating shaft 330 that extends out of the shaft groove 320 is fixedly sleeved by the mounting seat 500, which can be specifically connected by a key connection. Then, the mounting seat 500 has a flat surface, and a slider protrudes from the flat surface that adapts to the slide groove on the rotating plate 400. The slider slides in the slide groove of the rotating plate 400, and the flat surface on the mounting seat 500 abuts against the rotating plate 400. By sliding the rotating plate 400, the mounting seat 500 can be disengaged from the slide groove in the direction away from the second plate 420. Conversely, the connection between the mounting seat 500 and the rotating plate 400 can be completed, thereby facilitating the replacement of the rotating plate 400.

[0054] 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 is an L-shaped block structure, and together with the sliding frame 820 slidably disposed on the fixed frame 810, a clamping space is formed. The lower die base 200 has a fixed protrusion that can be placed in the clamping space. The fixed protrusion can be clamped by sliding the sliding frame 820 close to the fixed frame 810.

[0055] The sliding member can form a structure that can fasten the fixing protrusion with the fixing frame 810 by means of bolts.

[0056] The sliding design of the sliding frame 820 on the fixed frame 810 and the adjustable clamping structure make the installation and removal of the lower die base 200 more convenient and quick. The operator can quickly replace the lower die base 200 according to different processing requirements.

[0057] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sheet metal bending machine, comprising a frame (100) and an upper die (110) and a lower die arranged on the frame (100), characterized in that: The lower die comprises: A lower die base (200) is provided on the frame (100); There are two limit blocks (300), both of which are slidably arranged on the lower die base (200), and a limit space (310) is formed between the two limit blocks (300), so that the upper die (110) can move downward and press the bending part to the limit space (310), and the two limit blocks (300) can slide toward each other or slide away from each other in the lower die base (200) to adjust the width of the limit space (310); There are two rotating plates (400), and the two rotating plates (400) are rotatably arranged on the 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) jointly form a supporting surface for supporting the bending part. When the two rotating plates (400) are in the separating state, the two rotating plates (400) can be rotated to the side walls adjacent to the two limiting blocks (300) when the upper mold (110) presses the bending part downward to correspondingly abut against the side walls so as to separate the bending part and the limiting blocks (300).

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 be connected, and the contact edges of the two rotating plates (400) are located on a symmetrical surface with the two limiting blocks (300).

3. The metal sheet bending machine according to claim 2, characterized in that: The rotating plate (400) comprises a first plate (410) and a second plate (420) which are arranged at an angle, the first plate (410) being rotatably arranged on the limit block (300), the lower die base (200) being provided with a side baffle (210) located outside the limit block (300), the second plate (420) being able to rotate under the action of its own weight until it abuts against the side baffle (210) and drives the first plate (410) to rotate until it contacts the top surface of the limit block (300), so that the first plates (410) of the two rotating plates (400) form the supporting surface.

4. The metal sheet bending machine according to claim 3, characterized in that: The top of the limiting block (300) is provided with an axis groove (320), the axis grooves (320) of the two limiting blocks (300) are located on a side where the two limiting blocks (300) are close to each other, and the rotating plate (400) is rotatably arranged in the axis groove (320) via a rotating shaft (330), and further comprises: The mounting seat (500) is arranged on the rotating shaft (330), and the mounting seat (500) is used to support the rotating plate (400) so that the rotating plate (400) is rotatably arranged on the limiting block (300).

5. The metal sheet bending machine according to claim 4, characterized in that: The mounting seat (500) is slidably connected to the rotating plate (400).

6. The metal sheet bending machine according to claim 5, characterized in that: Also includes: a polished rod (610) disposed on the lower die base (200), the polished rod (610) passing through the limit block (300), and the polished rod (610) being used to limit the sliding direction of the limit block (300); A screw rod (620) is rotatably arranged on the lower die base (200), and the screw rod (620) has a first section and a second section with opposite thread rotation directions. The two limit blocks (300) are respectively threadedly connected to the first section and the second section, so that the screw rod (620) can drive the two limit blocks (300) to move closer to or farther away from each other.

7. The metal sheet bending machine according to claim 6, characterized in that: 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 blocks (300) slide relative to the second plate (420), and further includes: The magnetic block (411) is arranged on a 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 be attracted to each other.

8. The metal sheet bending machine according to claim 6, characterized in that: Also includes: A collecting member (700) is provided between the two limiting blocks (300), and the collecting member (700) is provided higher than the polished rod (610). The collecting member (700) is used to collect debris generated by bending the bending member.

9. The metal sheet bending machine according to claim 4, characterized in that: Both ends of the rotating plate (400) protrude outward from the limit block (300), both ends of the rotating shaft (330) protrude from the shaft groove (320), both ends of the rotating shaft (330) have threaded holes, and the mounting seat (500) has a through hole for a fastener to pass through so that the fastener is threadedly connected to the threaded hole.

10. The metal sheet bending machine according to claim 1, characterized in that: It also includes a mounting frame (800) for mounting the lower die base (200), and the mounting frame (800) includes: A fixing frame (810) is provided on the frame (100); A sliding frame (820) is slidably arranged on the fixed frame (810), and 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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