Press arm type double flipper center

Abstract

The application provides a press arm type double-turning plate center, relates to the technical field of metal plate bending, and comprises a rack, a plate turning arm arranged on the rack, two bending knives arranged on the plate turning arm, the ends of the two bending knives close to each other in contact, the ends of the two bending knives away from each other are both provided with rotating shafts, and the rotating shafts are rotationally connected with the plate turning arm; elastic members are arranged between the bending knives and the plate turning arm, the elastic members are used for enabling the two bending knives to have a tendency to be in an initial position, when the two bending knives are in the initial position, the straight lines in the length direction of the two bending knives are collinear; after a material pressing unit presses the plate material, the plate turning arm rotates relative to the plate material, the two bending knives gradually bend the plate material, the outside of the neutral layer of the plate material is stretched to generate an acting force on the bending knives, the two bending knives relatively rotate around the rotating shafts, the straight lines in the length direction of the two bending knives are arranged at an included angle, the relative movement between the plate material and the two bending knives and the generation of scratches are reduced, and the machining precision of the bending knives and the surface quality of the plate material are ensured to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of metal sheet bending technology, and in particular to a pressure arm type double-flipping center. Background Technology

[0002] Sheet metal bending is a core process for shaping metal sheets into specific forms through plastic deformation. It is widely used in the manufacturing of products such as chassis and cabinets, automotive parts, and appliance housings. Early bending processes relied primarily on manual labor in conjunction with bending machines. These machines consisted of a bed, slide block, upper and lower dies, and a drive system. The slide block drove the upper die downwards, pressing the sheet metal into the V-groove of the lower die for bending. This method is a line-contact extrusion bending, simple in structure and highly versatile, but its processing efficiency and accuracy were significantly affected by manual operation. CNC bending centers further integrate servo drive systems, PLC controllers, and automatic feeding mechanisms. They achieve multi-axis linkage positioning by clamping the sheet metal. During processing, the upper and lower bending blades move relative to each other in the vertical direction, pressing the sheet metal through line contact to complete the bending shape. This allows for automated multi-pass continuous bending, improving processing efficiency and accuracy consistency.

[0003] As a new generation of automatic bending equipment, the flip-plate bending machine adopts an integrated folding structure, mainly composed of a worktable, a pressing mechanism, a flip-plate arm, and a servo transmission system. Two sets of flip-plate arms can be symmetrically arranged vertically. During operation, the pressing mechanism first presses the sheet metal onto the worktable, causing the folded edge to extend beyond the worktable. Then, the flip-plate arm synchronously flips the sheet metal around the folding line, and the folding blade on the flip-plate arm drives the sheet metal to complete the bending process. Although the flip-plate arm and the sheet metal are in surface contact throughout the process, a slight relative movement still occurs, causing scratches on the surface of the sheet metal and affecting the processing accuracy of the folding blade and the surface quality of the sheet metal.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a pressure arm type double flipping center to address the problems existing in current flipping bending machines.

[0006] The above objectives are achieved through the following technical solutions: A double-flip tilting plate center with a pressure arm includes a frame, on which a positioning unit and a pressing unit are provided. The positioning unit is used to position the sheet metal, and the pressing unit is used to press the sheet metal. The frame is provided with a rotatable tilting arm, on which two elongated folding blades are symmetrically arranged. The two folding blades are in contact at their close ends, and each of the two folding blades is provided with a rotating shaft at its far ends. The rotating shaft is rotatably connected to the tilting arm, and the axis of the rotating shaft is horizontally set and perpendicular to the length direction of the folding blades. An elastic element is provided between the rotating shaft and the tilting arm. The elastic element is used to tend to position the two folding blades in their initial positions. In the initial positions, the straight lines containing the length directions of the two folding blades are collinear. When the tilting arm rotates relative to the sheet metal, the two folding blades gradually bend the sheet metal, and the sheet metal causes the two folding blades to rotate relative to each other around their respective rotating shafts.

[0007] Furthermore, the pressing unit includes an upper pressing plate and a lower pressing plate. A first driving member is provided on the frame. The first driving member is used to move the upper pressing plate closer to or away from the lower pressing plate to press or release the sheet material. The lower pressing plate has a first contact surface on the side near the folding blade. The first contact surface is an arc surface and gradually moves away from the two folding blades from the middle to both ends. The axis of the first contact surface is vertically arranged and located on the side of the first contact surface away from the folding blades. When the flip arm rotates relative to the sheet material, the inner surface of the sheet material contacts the first contact surface, and the outer surface of the sheet material contacts the two folding blades.

[0008] Furthermore, two flip arms are arranged opposite each other, and the upper pressure plate has a second contact surface on the side near the folding knife. The second contact surface has the same structure as the first contact surface.

[0009] Furthermore, the lower pressure plate has a first protrusion extending toward the folding knife, and a first contact surface is located on the side of the first protrusion near the folding knife; the upper pressure plate has a second protrusion extending toward the folding knife, and a second contact surface is located on the side of the second protrusion near the folding knife.

[0010] Furthermore, the positioning unit includes a second drive member, an upper pressure arm, and a lower pressure arm. The second drive member is used to move the upper pressure arm closer to or further away from the lower pressure arm to press or release the sheet material.

[0011] Furthermore, the positioning unit also includes a motion seat, with an upper pressure arm and a lower pressure arm disposed on the motion seat, which is used to move and rotate the sheet metal relative to the frame.

[0012] Furthermore, the frame is equipped with side plates, and both flip arms are rotatably mounted on the side plates; the frame is also equipped with a third drive unit and a fourth drive unit, the third drive unit is used to move the side plates up and down, and the fourth drive unit is used to move the side plates toward or away from the pressing unit.

[0013] Furthermore, the elastic element is a torsion spring, with one end connected to the rotating shaft and the other end connected to the flap arm.

[0014] Furthermore, a fixing component is provided at the end of the pivot away from the flip arm, which is used to fix the folding knife to the pivot.

[0015] Furthermore, the fixing component includes a sleeve and a bolt. One end of the sleeve has an opening and the other end has an end cap. A groove is formed on the sleeve from the opening to the end cap. The length direction of the groove is arranged along the radial direction of the sleeve, and the width direction of the groove matches the size of the folding knife. A through hole is formed on the end cap and the folding knife together. The bolt passes through the through hole and is threaded to the end of the rotating shaft away from the flip arm.

[0016] The present invention has at least the following beneficial effects: After the pressing unit clamps the sheet metal, the flip arm rotates relative to the sheet metal, and the two folding blades gradually bend the sheet metal. The outer side of the neutral layer of the sheet metal is stretched and exerts a force on the folding blades, causing the two folding blades to rotate relative to each other around their respective axes. The straight lines along the length directions of the two folding blades are set at an angle to reduce the relative movement between the sheet metal and the two folding blades and the generation of scratches, thus ensuring the processing accuracy of the folding blades and the surface quality of the sheet metal to a certain extent. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the center of the pressure arm type double-flip flap provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 for Figure 1 The front view; Figure 5 for Figure 1 A schematic diagram of a partial structure; Figure 6 for Figure 5 Side view; Figure 7 for Figure 6 CC-direction sectional view; Figure 8 for Figure 7 A magnified view of a section at point D; Figure 9 for Figure 7 A schematic diagram showing the state of the medium plate material after bending. Figure 10 for Figure 9 A magnified view of a section at point E in the middle; Figure 11 This is a structural diagram of the flip arm and folding knife; Figure 12 for Figure 11 A magnified view of a section at point F in the middle; Figure 13 for Figure 11 The front view; Figure 14 for Figure 13 A magnified view of a section at point G in the middle; Figure 15 This is a schematic diagram of the lower pressure plate. Figure 16 for Figure 15 Top view; Figure 17 This is a schematic diagram of the ideal state of the sheet metal after bending. Figure 18 This is a schematic diagram showing the state of bow-shaped deflection produced after bending a sheet metal. Figure 19 This is a schematic diagram showing the state of a sheet metal after bending to produce a preset shape. Figure 20 for Figure 12 Exploded view of the parts.

[0018] in: 100. Frame; 101. Flip arm; 102. Plate body; 103. Crank; 104. Upper pressure plate; 105. Lower pressure plate; 108. Disc; 109. Connecting pin; 110. Lifting block; 111. Plate material; 201. Folding knife; 202. Spindle; 204. First contact surface; 205. Sleeve; 206. Bolt; 207. End cap; 208. Slot; 209. Groove; 301. Second drive unit; 302. Upper pressure arm; 303. Lower pressure arm; 304. Motion seat; 305. Feeding unit; 306. Adjustment motor; 401. Side plate; 402. Third motor; 403. First lead screw; 404. Slide plate; 405. First slide rail; 406. Fourth motor; 407. Second lead screw; 408. Second slide rail. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1 to 20 As shown, this embodiment of the invention provides a pressure arm type double-flip flap center, including a frame 100. The frame 100 is provided with a positioning unit and a pressing unit. The positioning unit is used to position the sheet material 111, and the pressing unit is used to press the sheet material 111. The frame 100 is provided with a rotatable flap arm 101. Two elongated folding blades 201 are symmetrically arranged on the flap arm 101. The ends of the two folding blades 201 that are close to each other are in contact, and the ends of the two folding blades 201 that are far apart from each other are provided with a rotating shaft 202. The rotating shaft 202 is connected to the flap. The arm 101 is rotatably connected, and the axis of the rotating shaft 202 is horizontally set and perpendicular to the length direction of the folding blade 201. An elastic element is provided between the rotating shaft 202 and the flip arm 101. The elastic element is used to make the two folding blades 201 tend to be in the initial position. When in the initial position, the straight lines in the length direction of the two folding blades 201 are collinear. When the flip arm 101 rotates relative to the sheet 111, the two folding blades 201 gradually bend the sheet 111, and the sheet 111 causes the two folding blades 201 to rotate relative to each other around their respective rotating shafts 202.

[0023] After the pressing unit presses the sheet 111, the flip arm 101 rotates relative to the sheet 111. The two folding blades 201 gradually bend the sheet 111. The outer side of the neutral layer of the sheet 111 is stretched, which exerts a force on the folding blades 201, causing the two folding blades 201 to rotate relative to each other around their respective pivots 202. The straight lines along the length direction of the two folding blades 201 are set at an angle, which reduces the relative movement between the sheet 111 and the two folding blades 201 and the generation of scratches, and to a certain extent ensures the processing accuracy of the folding blades 201 and the surface quality of the sheet 111.

[0024] It is understandable that, such as Figures 7 to 10 As shown, the upper flip arm 101 rotates clockwise relative to the sheet 111. The two folding blades 201 apply a first force to the sheet 111, causing the right side of the sheet 111 to bend downwards relative to the left side, and stretching the outer side of the neutral layer of the sheet 111. Simultaneously, the sheet 111 applies a second force to the two folding blades 201. The first and second forces are opposite in direction and equal in magnitude, causing the two folding blades 201 to rotate relative to each other around their respective axes 202. The lines containing the length directions of the two folding blades 201 are set at an angle. For details, please refer to... Figure 11 , Figure 13 and Figure 14 The ends of the two folding blades 201 that are closer to each other are higher than the ends that are farther apart. Therefore, during the bending process, the relative movement between the ends of the two folding blades 201 that are farther apart and the sheet metal 111 remains almost constant, while the relative movement between the ends of the two folding blades 201 that are closer to each other is reduced. In other words, the relative movement between the folding blades 201 and the sheet metal 111 gradually decreases from the ends that are farther apart to the ends that are closer together. This reduces the overall relative movement between the sheet metal 111 and the two folding blades 201, thereby reducing the occurrence of scratches on the sheet metal 111 and the two folding blades 201, and to a certain extent ensuring the processing accuracy of the folding blades 201 and the surface quality of the sheet metal 111.

[0025] Among them, see Figure 5 and Figure 11 The flap arm 101 is C-shaped in general, and specifically includes a plate 102 in the middle and cranks 103 at both ends. One end of the crank 103 is rotatably connected to the frame 100, and the other end of the crank 103 is fixed to the plate 102. Two folding blades 201 are set on the plate 102. The frame 100 is equipped with a first motor for rotating the crank 103, and is equipped with a corresponding power supply and control module to control the starting, stopping, steering, and rotation angle of the machine.

[0026] After the sheet 111 is bent, the first motor drives the upper flip arm 101 to rotate in the opposite direction relative to the sheet 111, causing the folding blade 201 to disengage from the sheet 111. At the same time, the elastic element causes the folding blade 201 to rotate in the opposite direction around its respective pivot 202 to return to its initial position.

[0027] In one embodiment, the pressing unit includes an upper pressing plate 104 and a lower pressing plate 105. A first driving member is provided on the frame 100. The first driving member is used to move the upper pressing plate 104 closer to or away from the lower pressing plate 105 to press or release the sheet material 111. See also Figure 15 and Figure 16 The lower pressure plate 105 has a first contact surface 204 on the side near the folding blade 201. The first contact surface 204 is an arc surface and gradually moves away from the two folding blades 201 from the middle to both ends. The axis of the first contact surface 204 is vertically set and located on the side of the first contact surface 204 away from the folding blades 201. When the flip arm 101 rotates relative to the sheet 111, the inner surface of the sheet 111 contacts the first contact surface 204, and the outer surface of the sheet 111 contacts the two folding blades 201.

[0028] After bending sheet 111, creases are formed. For an ideal result, please refer to [reference needed]. Figure 17 , Figure 17 The upper middle side line is the crease. In existing technology, the length direction of this crease is consistent with the length direction of the two folding blades 201. However, after bending, the sheet metal 111 will produce an arc-shaped deflection, that is, the sheet metal 111 will undergo slight deformation in the length direction of the crease. Figure 17 The ideal state shown gradually transforms into Figure 18 The state shown affects the forming accuracy and product quality of sheet metal 111 (see "Part Bending and Unfolding", Yang Chaopei). Specifically, along the length of the crease, the two ends of sheet metal 111 are biased towards the outer side of the neutral layer, while the middle of the crease is biased towards the inner side of the neutral layer, such as... Figure 18 As shown, the reason for this phenomenon is as follows: When sheet 111 is bent, the material on the outer side of the neutral layer thins due to tension. At this time, material along the crease length direction flows in to compensate for this change, causing the material on the outer side of the neutral layer to shrink along the crease length direction. Conversely, the material on the inner side of the neutral layer thickens due to compression, but due to processing limitations, the material on the inner side of the neutral layer expands along the crease direction. Therefore, in general, after bending, sheet 111 undergoes different degrees of deformation on its inner and outer sides along the crease length direction, resulting in an arc-shaped deflection at the crease location along its length direction.

[0029] In this invention, the first contact surface 204 of the pressure plate 105 is set as an arc surface, so that the sheet 111 produces a preset shape after bending that is opposite to the aforementioned bow-shaped deflection. That is, in the length direction of the crease, the two ends of the sheet 111 are biased towards the inner side of the neutral layer, while the middle part of the crease is biased towards the outer side of the neutral layer, such as... Figure 19 As shown. Simultaneously, during the bending of the sheet metal 111, the two folding blades 201 rotate relative to each other around their respective axes 202. The ends of the two folding blades 201 that are farther apart exert a greater force on the sheet metal 111, causing greater deformation at both ends of the sheet metal 111 along the crease length. The ends of the two folding blades 201 that are closer together exert a smaller force on the sheet metal 111, causing less deformation in the middle of the sheet metal 111 along the crease length. Thus, the sheet metal 111 undergoes deformation adapted to the first contact surface 204, which to a certain extent suppresses the deformation of the sheet metal 111 after bending. Figure 18 The bow-shaped deflection shown causes the sheet 111 to bend from... Figure 19 The state shown gradually changes to Figure 17 The state shown ensures the forming accuracy and product quality of sheet 111.

[0030] The lower pressure plate 105 can be directly fixed to the frame 100, as shown in the reference. Figure 1 and Figure 2 The first driving component can be symmetrically arranged in two sets, including a second motor, a disc 108, a connecting pin 109, and a lifting block 110. The second motor is equipped with a corresponding power supply and control module to control the start, stop, and rotation angle of the operating conditions. The output end of the second motor is fixed to the disc 108. The connecting pin 109 is eccentrically mounted on the disc 108. The upper end of the lifting block 110 is connected to the connecting pin 109, and the lower end of the lifting block 110 is connected to the upper pressure plate 104. The output end of the second motor drives the disc 108 and the connecting pin 109 to rotate, thereby moving the upper pressure plate 104 up and down. A vertical guide rail is provided on the frame 100 to guide the up and down movement of the upper pressure plate 104. The output end of the second motor can lock the rotation angle to lock the up and down position of the upper pressure plate 104. A horizontal adjustment rail is provided between the lower end of the lifting block 110 and the upper pressure plate 104 to adjust the horizontal position of the upper pressure plate 104. The first driving component may also take other forms, such as hydraulic cylinders or pneumatic cylinders, and there are no restrictions here.

[0031] In one embodiment, two flip arms 101 are arranged opposite each other, and the upper pressure plate 104 has a second contact surface on the side near the folding knife 201. The second contact surface has the same structure as the first contact surface 204.

[0032] The double-flip arm 101 is used to improve the processing capacity and range of the sheet 111. Regardless of whether the sheet 111 is bent upwards or downwards, it can suppress the bow-shaped deflection of the sheet 111 after bending to a certain extent, thus ensuring the forming accuracy and product quality of the sheet 111.

[0033] The two flip arms 101 and their components such as the folding knife 201 and the rotating shaft 202 are all the same, except that they are positioned differently at the top and bottom.

[0034] In one embodiment, the lower pressure plate 105 has a first protrusion extending toward the folding blade 201, and a first contact surface 204 is located on the side of the first protrusion near the folding blade 201; the upper pressure plate 104 has a second protrusion extending toward the folding blade 201, and a second contact surface is located on the side of the second protrusion near the folding blade 201.

[0035] By adopting the above structure, the movement trajectory of the flip arm 101 can be avoided, thus preventing interference. At the same time, it can avoid the bent edges of the sheet metal 111, supporting multiple consecutive bending passes.

[0036] In one embodiment, see [link to relevant documentation]. Figure 1 and Figure 3 The positioning unit includes a second driving member 301, an upper pressure arm 302 and a lower pressure arm 303. The second driving member 301 is used to move the upper pressure arm 302 closer to or further away from the lower pressure arm 303 to press or release the sheet material 111.

[0037] The upper pressure arm 302 and the lower pressure arm 303 are used to clamp the sheet 111. Compared with the suction cup structure, the sheet 111 can be better prevented from shifting during the bending process, thus ensuring the forming accuracy and product quality of the sheet 111.

[0038] The second driving component 301 can be a hydraulic cylinder or a pneumatic cylinder, and is equipped with a corresponding power source and control module to control the start, stop, and extension stroke. The output end of the second driving component 301 drives the upper pressure arm 302 to move up and down, so that the upper pressure arm 302 moves closer to or away from the lower pressure arm 303 to press or release the sheet metal 111.

[0039] In one embodiment, the positioning unit further includes a motion seat 304, with an upper pressure arm 302 and a lower pressure arm 303 disposed on the motion seat 304. The motion seat 304 is used to move and rotate the sheet metal 111 relative to the frame 100.

[0040] A feeding unit 305 is provided on the frame 100, which may have a ball screw or synchronous belt drive pair, thereby moving the moving seat 304 relative to the frame 100 and changing the position of the sheet metal 111 relative to the frame 100. The lower pressure arm 303 is rotatably mounted on the moving seat 304, and its rotation axis is vertically arranged. The output end of the second drive unit 301 is provided with an adjusting motor 306, and is equipped with a corresponding power supply and control module to control start / stop, direction, and rotation angle. The output end of the adjusting motor 306 is connected to the upper pressure arm 302 to drive the upper pressure arm 302 to rotate, thereby driving the sheet metal 111 between the upper pressure arm 302 and the lower pressure arm 303 to rotate relative to the frame 100, allowing different edges of the sheet metal 111 to be bent. In addition, rubber pads are provided on the surfaces of the upper pressure arm 302 and the lower pressure arm 303 that are close to each other, and the upper pressure arm 302 and the lower pressure arm 303 are in contact with the sheet metal 111 through the rubber pads.

[0041] In one embodiment, see [link to relevant documentation] Figure 5 The frame 100 is provided with a side plate 401, and two flip arms 101 are rotatably mounted on the side plate 401. The frame 100 is also provided with a third drive member and a fourth drive member. The third drive member is used to move the side plate 401 up and down, and the fourth drive member is used to move the side plate 401 towards or away from the pressing unit.

[0042] By adopting a dual-axis compensation system, the relative position of the bending blade 201 and the sheet 111 is adaptively adjusted, which is suitable for bending sheet 111 of different thicknesses and materials. It is easy to use and does not require manual adjustment.

[0043] The third driving component includes a third motor 402, a first lead screw 403, a slide plate 404, and a first slide rail 405. The third motor 402 is fixed to the frame 100, and its output end is fixed to the first lead screw 403. The first lead screw 403 is threadedly connected to the slide plate 404. The first slide rail 405 is mounted on the frame 100 and guides the vertical sliding of the slide plate 404. The fourth driving component includes a fourth motor 406, a second lead screw 407, and a second slide rail 408. The fourth motor 406 is fixed to the slide plate 404, and its output end is fixed to the second lead screw 407. The second lead screw 407 is threadedly connected to the side plate 401. The second slide rail 408 is mounted on the side plate 401 and guides the horizontal sliding of the side plate 401. Both the third motor 402 and the fourth motor 406 are equipped with corresponding power supplies and control modules to control start / stop, steering, and rotation angle. The output of the third motor 402 drives the first lead screw 403 to rotate, causing the slide plate 404 and the side plate 401 to slide up and down synchronously, thereby adjusting the up and down position of the flip arm 101 and the folding knife 201; the output of the fourth motor 406 drives the second lead screw 407 to rotate, causing the side plate 401 to move closer to or further away from the pressing unit, thereby adjusting the horizontal position of the flip arm 101 and the folding knife 201.

[0044] In addition, a control cabinet is provided on the rack 100. The control cabinet contains a processor, which is connected to all the above-mentioned control modules to realize the linkage control of each structure. The specific configuration of the control cabinet is existing technology and will not be described in detail here.

[0045] In one embodiment, the elastic element is a torsion spring, one end of which is connected to the rotating shaft 202, and the other end of which is connected to the flap arm 101.

[0046] In one embodiment, see [link to relevant documentation] Figure 11 , Figure 12 and Figure 20 The end of the pivot 202 away from the flip arm 101 is provided with a fixing component, which is used to fix the folding knife 201 to the pivot 202.

[0047] In one embodiment, the fixing assembly includes a sleeve 205 and a bolt 206. One end of the sleeve 205 has an opening, and the other end has an end cap 207. A groove 208 is formed on the sleeve 205 from the opening to the end cap 207. The length direction of the groove 208 is arranged radially along the sleeve 205, and the width direction of the groove 208 matches the size of the folding knife 201. A through hole is formed on the end cap 207 and the folding knife 201. The bolt 206 passes through the through hole and is threadedly connected to the end of the rotating shaft 202 away from the flip arm 101. Further, a groove 209 is also provided on the end of the rotating shaft 202 away from the flip arm 101, and the groove 209 is arranged opposite to the groove 208.

[0048] In use, first place the sleeve 205 on the end of the rotating shaft 202 away from the flip arm 101, so that the groove 209 aligns with the slot 208. Then, place the folding knife 201 into both the groove 209 and the slot 208. Next, pass the bolt 206 through the through holes on the end cap 207 and the folding knife 201 in sequence, and tighten the bolt 206 onto the end of the rotating shaft 202 away from the flip arm 101, thereby fixing the folding knife 201 to the rotating shaft 202. Of course, the folding knife 201 can also be fixed to the rotating shaft 202 by welding or other fixing methods.

[0049] The working principle of this invention is as follows: The sheet metal 111 is placed between the upper pressure arm 302 and the lower pressure arm 303. The output end of the second drive unit 301 drives the upper pressure arm 302 to move downward, so that the upper pressure arm 302 is close to the lower pressure arm 303 to press the sheet metal 111. The feeding unit 305 drives the motion seat 304 to move relative to the frame 100, so that the edge of the sheet metal 111 to be bent extends between the upper pressure plate 104 and the lower pressure plate 105. The output end of the second motor drives the disc 108 and the connecting pin 109 to rotate, so that the upper pressure plate 104 moves downward to approach the lower pressure plate 105, thereby pressing the sheet metal 111. The output of the third motor 402 drives the first lead screw 403 to rotate, causing the slide plate 404 and the side plate 401 to slide up and down synchronously, thereby adjusting the up and down position of the flip arm 101 and the folding knife 201; the output of the fourth motor 406 drives the second lead screw 407 to rotate, causing the side plate 401 to move closer to or further away from the pressing unit, thereby adjusting the horizontal position of the flip arm 101 and the folding knife 201.

[0050] When the sheet metal 111 needs to be bent downwards, the bending blade 201 needs to be positioned appropriately above the sheet metal 111. The first motor drives the upper flip arm 101 to rotate relative to the sheet metal 111. The two bending blades 201 gradually bend the sheet metal 111. The outer side of the neutral layer of the sheet metal 111 is stretched, which exerts a force on the bending blades 201, causing the two bending blades 201 to rotate relative to each other around their respective pivots 202. The straight lines along the length direction of the two bending blades 201 are set at an angle to reduce the relative movement between the sheet metal 111 and the two bending blades 201 and the generation of scratches. This ensures the processing accuracy of the bending blades 201 and the surface quality of the sheet metal 111 to a certain extent.

[0051] In addition, sheet metal 111 will exhibit an arc-shaped deflection after bending, meaning that sheet metal 111 will undergo slight deformation along the length of the crease. Figure 17 The ideal state shown gradually transforms into Figure 18 The state shown affects the forming accuracy and product quality of sheet 111. By setting the first contact surface 204 of the lower pressure plate 105 as an arc surface, the sheet 111 produces a preset shape after bending that is opposite to the aforementioned bow-shaped deflection. That is, in the length direction of the crease, the two ends of the sheet 111 are biased towards the inner side of the neutral layer, while the middle of the crease is biased towards the outer side of the neutral layer, such as... Figure 19 As shown. Simultaneously, during the bending of the sheet metal 111, the two folding blades 201 rotate relative to each other around their respective axes 202. The ends of the two folding blades 201 that are farther apart exert a greater force on the sheet metal 111, causing greater deformation at both ends of the sheet metal 111 along the crease length. The ends of the two folding blades 201 that are closer together exert a smaller force on the sheet metal 111, causing less deformation in the middle of the sheet metal 111 along the crease length. Thus, the sheet metal 111 undergoes deformation adapted to the first contact surface 204, which to a certain extent suppresses the deformation of the sheet metal 111 after bending. Figure 18The bow-shaped deflection shown causes the sheet 111 to bend from... Figure 19 The state shown gradually changes to Figure 17 The state shown ensures the forming accuracy and product quality of sheet 111.

[0052] After sheet metal 111 is bent, the first motor drives the upper flip arm 101 to rotate in the opposite direction relative to sheet metal 111, causing the folding blade 201 to disengage from sheet metal 111. Simultaneously, the elastic element causes the folding blade 201 to rotate in the opposite direction around its respective pivot 202 to return to its initial position. The output end of the second motor drives the disc 108 and connecting pin 109 to rotate in the opposite direction, causing the upper pressure plate 104 to move upward away from the lower pressure plate 105, thereby releasing sheet metal 111. The feeding unit 305 drives the motion seat 304 to move in the opposite direction relative to the frame 100, causing sheet metal 111 to disengage from between the upper pressure plate 104 and the lower pressure plate 105. There are two options afterward: one is to drive the upper pressure arm 302 upward through the output end of the second drive member 301, causing the upper pressure arm 302 to move away from the lower pressure arm 303 to release sheet metal 111, and then remove the bent sheet metal 111. Secondly, by adjusting the motor 306 to drive the plate 111 between the upper pressure arm 302 and the lower pressure arm 303 to rotate relative to the frame 100, different sides of the plate 111 can be switched for bending.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A pressure-arm type double-flip flap center, characterized in that, The machine includes a frame, on which are a positioning unit and a pressing unit. The positioning unit is used to position the sheet metal, and the pressing unit is used to press the sheet metal. The frame is equipped with a rotatable flip arm, on which are symmetrically arranged two elongated folding blades. The ends of the two folding blades that are close to each other are in contact, and the ends of the two folding blades that are far apart from each other are equipped with a rotating shaft. The rotating shaft is rotatably connected to the flip arm, and the axis of the rotating shaft is set horizontally and perpendicular to the length direction of the folding blades. An elastic element is provided between the rotating shaft and the flip arm. The elastic element is used to tend to keep the two folding blades in their initial position. In the initial position, the straight lines containing the length directions of the two folding blades are collinear. When the flip arm rotates relative to the sheet metal, the two folding blades gradually bend the sheet metal, and the sheet metal causes the two folding blades to rotate relative to each other around their respective rotating shafts.

2. The center of the pressure arm type double-flip flap according to claim 1, characterized in that, The pressing unit includes an upper pressing plate and a lower pressing plate. A first driving component is provided on the frame. The first driving component is used to move the upper pressing plate closer to or away from the lower pressing plate to press or release the sheet material. The lower pressing plate has a first contact surface on the side near the folding blade. The first contact surface is arc-shaped and gradually moves away from the two folding blades from the middle to both ends. The axis of the first contact surface is vertically set and located on the side of the first contact surface away from the folding blades. When the flip arm rotates relative to the sheet material, the inner surface of the sheet material contacts the first contact surface, and the outer surface of the sheet material contacts the two folding blades.

3. The center of the pressure arm type double-flip flap according to claim 2, characterized in that, Two flip-up arms are arranged opposite each other, and the upper pressure plate has a second contact surface on the side near the folding knife. The second contact surface has the same structure as the first contact surface.

4. The center of the pressure arm type double-flip flap according to claim 3, characterized in that, The lower pressure plate has a first protrusion extending toward the folding knife, and a first contact surface is located on the side of the first protrusion near the folding knife; the upper pressure plate has a second protrusion extending toward the folding knife, and a second contact surface is located on the side of the second protrusion near the folding knife.

5. The center of the pressure arm type double-flip flap according to claim 1, characterized in that, The positioning unit includes a second drive member, an upper pressure arm, and a lower pressure arm. The second drive member is used to move the upper pressure arm closer to or further away from the lower pressure arm to press or release the sheet material.

6. The center of the pressure arm type double-flip flap according to claim 5, characterized in that, The positioning unit also includes a motion seat, with an upper pressure arm and a lower pressure arm mounted on the motion seat. The motion seat is used to move and rotate the sheet metal relative to the frame.

7. The center of the pressure arm type double-flip flap according to claim 1, characterized in that, The frame is equipped with side plates, and two flip arms are rotatably mounted on the side plates. The frame is also equipped with a third drive unit and a fourth drive unit. The third drive unit is used to move the side plates up and down, and the fourth drive unit is used to move the side plates toward or away from the pressing unit.

8. The center of the pressure arm type double-flip flap according to claim 1, characterized in that, The elastic element is a torsion spring, with one end connected to the rotating shaft and the other end connected to the flap arm.

9. The center of the pressure arm type double-flip flap according to claim 1, characterized in that, A fixing component is provided at the end of the pivot away from the flip arm, which is used to fix the folding knife to the pivot.

10. The center of the pressure arm type double-flip flap according to claim 9, characterized in that, The fixing component includes a sleeve and a bolt. One end of the sleeve has an opening and the other end has an end cap. A groove is formed on the sleeve from the opening to the end cap. The length of the groove is arranged along the radial direction of the sleeve, and the width of the groove matches the size of the folding knife. A through hole is formed on the end cap and the folding knife. The bolt passes through the through hole and is threaded to the end of the rotating shaft away from the flip arm.

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