A counter-bending mechanism

Abstract

The application discloses a reverse punching and bending mechanism, which comprises a die mechanism, a feeding mechanism, a discharging mechanism and a dust removal mechanism. In the process of driving the upper die plate of the die mechanism to be pressed down, the feeding mechanism can be synchronously driven to feed and realize accurate positioning of a triangular bent plate to be punched. Through linkage among the swing plate, the air bag and the bending cutter block, the formed debris at the punching position can be adsorbed and treated at the moment of punching by the die mechanism, the negative pressure disturbance debris formed in the subsequent punching process is avoided, the punching quality of the product is improved, and compared with the traditional punching structure, the reverse punching mode is adopted to complete the punching, and the device is simplified. After the punching is completed, in the process of upward resetting of the upper die plate, on one hand, the further collection and cleaning of the adsorbed debris are realized, and on the other hand, the triangular bent plate after punching can be automatically discharged, and the punching and bending efficiency of the triangular bent plate is improved as a whole.

Description

Technical Field

[0001] This invention relates to the field of bending mechanism technology, and specifically to a reverse bending mechanism. Background Technology

[0002] During the stamping process, if the gap between the cutting edges is too small, the two cutting edges will squeeze together after the sheet metal is stamped, producing soft burrs. These soft burrs will fall off directly during production, producing debris. These debris will be carried to the die surface by the negative pressure generated during the stamping process. The debris that falls on the die surface will cause part imprints and bumps during the stamping process, affecting the quality of the product.

[0003] For the appendix Figure 1 In the stamping process of the three-sided bent portion 30 of the triangular bent plate 10 shown, the existing technology usually involves manually loading the triangular bent plate 10 into the lower die for positioning, and then removing the bent three-sided bent plate 30 after the subsequent stamping operation is completed, thereby making room for the subsequent stamping of the sheet metal. The above stamping method has the following drawbacks:

[0004] To facilitate the effective positioning of the triangular bent plate, an additional positioning device is usually required on the stamping die, which is complex in structure. Furthermore, after the triangle is positioned, the lack of effective clamping before stamping affects the subsequent stamping accuracy. The manual loading and unloading process makes the entire bending process inefficient. Summary of the Invention

[0005] Therefore, the present invention provides an anti-bending mechanism to solve the above-mentioned defects in the prior art.

[0006] An anti-bending mechanism, comprising:

[0007] A workbench, with a support plate installed on one side;

[0008] The mold mechanism includes an upper template mounted on one side of the support plate and driven to rise and fall by a telescopic cylinder, and a lower template mounted on the worktable and directly opposite the upper template. The lower surface of the upper template is provided with forming inserts and an upper support plate. The upper support plate is similar in shape to the triangle of the triangular bending plate. Several forming inserts are distributed around the upper support plate. The three sides of the forming inserts are provided with a first upper stop, a second upper stop, and a third upper stop, respectively, with the folding grooves spaced apart. The third upper stop is perpendicular to the material feeding direction of the triangular bending plate. The lower template is provided with a sliding groove corresponding to the upper folding groove. A folding block is vertically slidably arranged in the sliding groove. The upper surface of the lower template outside the folding block is provided with a lower stop corresponding to the first and second upper stops, respectively. A counter-bending mechanism is provided between the upper and lower templates. When the upper template moves down to the stamping position on the surface of the lower template, the counter-bending mechanism can drive the folding block to move up and bend the bent parts of the three sides of the triangular bending plate upward along the forming inserts along the folding grooves.

[0009] The feeding mechanism includes a movable slide plate slidably mounted on the surface of the worktable and a limiting cylinder suspended above the movable slide plate. The movable slide plate includes a material blocking part located on the outside and flush with the lower surface of the limiting cylinder, and a material receiving part located on the inner side of the material blocking part and recessed. The height of the limiting groove of the material receiving part is equivalent to the thickness of the triangular bent plate. The material receiving part can feed the triangular bent plate to the surface of the lower template and position it. The movable slide plate is synchronously linked with the upper template through a power mechanism. When the upper template moves downward, the movable slide plate moves towards the mold mechanism. When the upper template moves upward, the movable slide plate moves in the opposite direction.

[0010] The unloading mechanism includes a baffle plate installed on the top of the bent part of the triangular bending plate on the upper part of the workbench, a discharge port opened on the workbench directly below the baffle plate, and a receiving frame set below the discharge port.

[0011] Preferably, the device of the present invention further includes a dust removal mechanism, which includes a dust suction port opened at the top of the folding blade block. The top of the dust suction port is connected to an air bladder whose top is connected to the bottom of the folding blade block via a suction pipe. The bottom of the air bladder is fixedly connected to a horizontal support plate set below the lower template. A telescopic spring is also connected between the bottom of the folding blade block and the upper surface of the horizontal support plate. An exhaust pipe is also connected to the air bladder. Several exhaust pipes are connected to the same dust collection bag. A one-way feed valve is provided on the suction pipe, and a one-way discharge valve is provided on the exhaust pipe.

[0012] Preferably, the counter-attack mechanism includes a pressure rod vertically mounted on the lower surface of the upper template and a swing plate hinged in the middle to the bottom surface of the lower template. The outer end of the swing plate is directly opposite the upper pressure rod, the inner end of the swing plate is connected to the lower end of the folding knife block, and the inner end of the swing plate is connected to the top surface of the airbag.

[0013] Preferably, the power mechanism includes a rack disposed on the side wall of the telescopic cylinder push rod, a gear rotatably disposed on one side of the rack at the upper end of the push rod and meshing with the rack, a mounting plate vertically mounted at the tail end of the worktable, a rotating arm rotatably mounted on the inner side of the mounting plate, a transmission rod rotatably mounted on one side of the worktable, the shaft of the gear being connected to the transmission rod via a first pulley set, the shaft of the rotating arm being connected to the transmission rod via a second pulley set, a first limiting ball groove being disposed at the distal end of the rotating arm, a first rotating ball being rotatably mounted in the first limiting ball groove, a second limiting ball groove being disposed at the distal end of the movable slide plate, a second rotating ball being rotatably mounted in the second limiting ball groove, and the first rotating ball and the second rotating ball being connected by a connecting rod.

[0014] Preferably, the baffle includes two connecting blocks connected by a compression spring, one of the connecting blocks having a guide hole on its inner side, and the other connecting block having a guide rod extending into the guide hole on its inner side.

[0015] Preferably, the material receiving part has a through groove on the side surface near the material limiting groove, and the through groove can pass through the corresponding folding knife block.

[0016] Preferably, the height of the first upper stop block and the second upper stop block is greater than the height of the third upper stop block.

[0017] The present invention has the following advantages:

[0018] This invention's device, through the coordination of a mold mechanism, a feeding mechanism, a discharging mechanism, and a dust removal mechanism, simultaneously drives the feeding mechanism to feed materials and achieve precise positioning of the triangular bent plate to be stamped during the downward pressing of the upper template of the mold mechanism. Through the linkage between the swing plate, the airbag, and the folding blade block, it can absorb and treat the debris formed at the stamping location during the instant of stamping by the mold mechanism, avoiding negative pressure disturbance of debris during subsequent stamping processes, thus improving the stamping quality of the product. Furthermore, compared to traditional stamping structures, this structure uses a reverse-stroke method to complete the stamping, simplifying the device. After stamping, during the upward reset of the upper template, on the one hand, further collection and cleaning of the absorbed debris is achieved; on the other hand, the triangular bent plate is automatically unloaded after stamping, thus improving the overall stamping and bending efficiency of the triangular bent plate. Attached Figure Description

[0019] Figure 1 These are schematic diagrams of the triangular bent plate of the present invention before and after bending;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 This is a partial structural schematic diagram from another perspective of the present invention;

[0022] Figure 4 For the present invention Figure 3 A structural diagram from another perspective;

[0023] Figure 5 This is a schematic diagram of the feeding mechanism of the present invention;

[0024] Figure 6 This is a schematic diagram of the bottom structure of the upper template of the present invention;

[0025] Figure 7 This is a schematic diagram of the lower template and its mounting worktable according to the present invention;

[0026] Figure 8 This is a partial structural diagram of the stamping process of the present invention;

[0027] Figure 9 This is a partial structural diagram of the bending process of the rear bending section of the present invention;

[0028] In the picture:

[0029] 1-Workbench; 2-Mold mechanism; 3-Feeding mechanism; 4-Unloading mechanism; 5-Dust removal mechanism; 10-Triangular bending plate; 20-Triangle plate; 30-Bending section;

[0030] 101-Support plate; 201-Telescopic cylinder; 202-Upper template; 203-Lower template; 204-First upper stop block; 205-Second upper stop block; 206-Lower stop block; 207-Pressure rod; 208-Swing plate; 209-Folding knife block; 210-Forming insert; 211-Telescopic spring; 212-Upper support plate; 213-Folding knife groove; 214-Slide groove; 215-Horizontal support plate; 216-Through groove; 217-Third upper stop block;

[0031] 301-Limiting cylinder; 302-Side baffle; 304-Moving slide plate; 305-Blocking part; 306-Material receiving part; 307-Limiting groove; 309-Rack; 310-Gear; 311-First pulley group; 312-Second pulley group; 313-Transmission rod; 314-Mounting plate; 315-Rotating arm; 316-First rotating ball; 317-Connecting rod; 318-Second rotating ball; 319-First limiting ball groove; 320-Second limiting ball groove; 321-Connecting block; 322-Compression spring;

[0032] 501-Airbag; 502-Dust suction port; 503-Suction pipe; 504-One-way feed valve; 505-Exhaust pipe; 506-One-way discharge valve. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] like Figures 1 to 9 As shown, the present invention provides a reverse bending mechanism, including a worktable 1, a mold mechanism 2, a feeding mechanism 3, a discharging mechanism 4, and a dust removal mechanism 5.

[0035] Among them, a support plate 101 is installed on one side of the workbench 1;

[0036] The mold mechanism 2 includes an upper template 202 mounted on one side of the support plate 101 and driven to rise and fall by a telescopic cylinder 201, and a lower template 203 mounted on the worktable 1 and directly opposite the upper template 202. The lower surface of the upper template 202 is provided with forming inserts 210 and an upper support plate 212. The upper support plate 212 has a shape similar to the triangular plate 20 of the triangular bending plate 10. Several forming inserts 210 are distributed around the upper support plate 212. The three sides of the forming inserts 210 are spaced apart by folding knife grooves 213, each provided with a first upper stop 204, a second upper stop 205, and a third upper stop 217. The third upper stop 217 is perpendicular to the material feeding direction of the triangular bending plate 10. Furthermore, the height of the first upper stop 204 and the second upper stop 205 is greater than the height of the third upper stop 217.

[0037] The lower template 203 is provided with a sliding groove 214 corresponding to the upper folding groove 213. A folding block 209 is vertically slidably arranged in the sliding groove 214. The upper surface of the lower template 203 outside the folding block 209 is provided with a lower stop block 206 corresponding to the first upper stop block 204 and the second upper stop block 205 respectively. A counter-bending mechanism is provided between the upper template 202 and the lower template 203. When the upper template 202 moves down to the stamping position on the surface of the lower template 203, the counter-bending mechanism can drive the folding block 209 to move up and bend the bent portions 30 of the three sides of the triangular bent plate 10 upward along the forming insert 210 along the folding groove 213.

[0038] The feeding mechanism 3 includes a movable slide plate 304 slidably mounted on the surface of the workbench 1 and a limiting cylinder 301 suspended above the movable slide plate 304. The movable slide plate 304 includes a material blocking part 305 located on the outside and flush with the lower surface of the limiting cylinder 301, and a material receiving part 306 located in the inner side of the material blocking part 305. The height of the limiting groove 307 of the material receiving part 306 is equivalent to the thickness of the triangular bent plate 10. The material blocking part 305 includes two connecting blocks 321 connected by compression springs 322. One of the connecting blocks 321 has a guide hole 323 on its inner side, and the other connecting block 321 has a guide rod 324 extending into the guide hole 323 on its inner side.

[0039] The material receiving part 306 has a through groove 216 on one side surface near the limiting groove 307, and the through groove 216 can pass through the corresponding folding knife block 209.

[0040] The material receiving part 306 can feed the triangular bent plate 10 to the surface of the lower template 203 and position it. The movable slide plate 304 achieves synchronous linkage with the upper template 202 through the power mechanism. When the upper template 202 moves downward, the movable slide plate 304 moves towards the mold mechanism 2. When the upper template 202 moves upward, the movable slide plate 304 moves in the opposite direction.

[0041] The feeding mechanism 4 includes a baffle plate 401 installed on the top of the bent portion 30 of the triangular bending plate 10 after bending on the upper limit bearing portion 306 of the workbench 1, a discharge port 402 opened on the workbench 1 directly below the baffle plate 401, and a receiving frame 403 set below the discharge port 402.

[0042] The dust removal mechanism 5 includes a dust suction port 502 located at the top of the folding blade block 209. The top of the dust suction port 502 is connected to an air bladder 501 located below the folding blade block 209 via a suction pipe 503. The lower end of the air bladder 501 is fixedly connected to a horizontal support plate 215 located below the lower template 203. A telescopic spring 211 is also connected between the lower part of the folding blade block 209 and the upper surface of the horizontal support plate 215. An exhaust pipe 504 is also connected to the air bladder 501. Several exhaust pipes 504 are connected to the same dust collection bag (not shown in the figure). A one-way feed valve 505 is provided on the suction pipe 503, and a one-way discharge valve 506 is provided on the exhaust pipe 504.

[0043] The counter-attack mechanism includes a pressure rod 207 vertically mounted on the lower surface of the upper template 202 and a swing plate 208 hinged in the middle to the bottom surface of the lower template 203. The outer end of the swing plate 208 is directly opposite the upper pressure rod 207. The inner end of the swing plate 208 is connected to the lower end of the folding knife block 209 and the inner end of the swing plate 208 is connected to the top surface of the airbag 501.

[0044] The power mechanism includes a rack 309 disposed on the side wall of the push rod of the telescopic cylinder 201. A gear 310 is rotatably disposed on one side of the rack 309 at the upper end of the push rod, meshing with the rack 309. A mounting plate 314 is vertically mounted at the tail end of the worktable 1. A rotating arm 315 is rotatably mounted on the inner side of the mounting plate 314. A transmission rod 313 is rotatably mounted on one side of the worktable 1. The shaft of the gear 310 is connected to the transmission rod 313 via a first pulley set 311. The rotating shaft of the rotating arm 315 is connected to the transmission rod 313 via a second pulley set 312. The distal end of the rotating arm 315 is provided with a first limiting ball groove 319, and a first rotating ball 316 is rotatably installed in the first limiting ball groove 319. The distal end of the movable slide plate 304 is provided with a second limiting ball groove 320, and a second rotating ball 318 is rotatably installed in the second limiting ball groove 320. The first rotating ball 316 and the second rotating ball 318 are connected by a connecting rod 317.

[0045] Working principle of the device of the present invention:

[0046] I. Feeding:

[0047] The stacked triangular bent plates 10 are placed in the limiting cylinder 301, with the three sides of the triangular bent plates 10 abutting against the side baffles 302 of the limiting cylinder 301. The cross-sectional area of ​​the limiting cylinder 301 is slightly larger than the cross-section of the triangular bent plates 10, thus facilitating the easy insertion of the triangular bent plates 10.

[0048] In the initial state, the limiting groove 307 of the material receiving part 306 of the movable slide plate 304 is located directly below the limiting cylinder 301. The triangular bent plate 10 located at the bottom falls into the material receiving part 306.

[0049] II. Positioning and Bending:

[0050] Telescopic cylinder 201 drives the upper template 202 to descend. During the downward extension of the push rod of telescopic cylinder 201, the rack 309 on the push rod drives the gear 310 to rotate, thereby realizing the rotation of transmission rod 313 through the first pulley group 311. Transmission rod 313 realizes the rotation of rotating arm 315 on the inner surface of mounting plate 314 through second pulley group 312. Rotating arm 315 then drives the movable slide plate 304 connected to one end of connecting rod 317 to move along the surface of workbench 1. The material-bearing part 306 at the front end of movable slide plate 304 slides into the lower template 203. As the triangular bent plate 10 on it slides into the material-bearing part 306, the triangular part at its front end... The two bent portions 30 of the bending plate 10 will first contact the inner walls of the first upper stop 204 and the second upper stop 205 extending downward on the upper template 202 and be guided. As the moving slide plate 304 moves further inward, the inner wall of the limiting groove 307 of the material receiving part 306 will squeeze the bent portion 30 at the rear end of the triangular bending plate 10, so that the two bent portions 30 at the front end of the triangular bending plate 10 are fully limited to the inner side of the first upper stop 204 and the second upper stop 205, so that the triangular bending plate 10 is accurately positioned in the stamping position, that is, the three folding blades 209 on the lower template 203 are respectively facing the three bent portions 30 on the three sides of the upper triangular bending plate 10.

[0051] Furthermore, as the above-mentioned stamping and positioning work is completed, the pressure plate 207 is pressed down to the outer end of the swing plate 208, and the other end of the swing plate 208 will be lifted up. The folding knife block 209 connected to it passes through the slide groove 214 and the through groove 216 and passes through the folding knife groove 213, and vertically bends the three bending parts 30 of the triangular bending plate 10 upward along the forming insert 210.

[0052] The challenge to overcome in this process is that after the positioning is completed, the position of the material receiving part 306 no longer changes. However, as the stamping work proceeds, the push rod of the telescopic cylinder 201 descends further, which will push the moving slide plate 304 to move further, creating a contradiction.

[0053] The present invention solves the above problems by dividing the material blocking part 305 into two connecting blocks 321. When the moving slide plate 304 moves further, it will only squeeze the rear connecting block 321 to move closer to the front connecting block 321, without affecting the movement of the material receiving part 306 which is fixedly connected to the front connecting block 321, thereby effectively overcoming the above problems.

[0054] Furthermore, during the stamping process, the rear bending portion 30 is not supported by the upper and lower blocks 204 and 206, or by the upper and lower blocks 205 and 206 respectively, unlike the two inner bending portions 30. The limiting groove 307 of the material-bearing portion 306 supporting the rear bending portion 30 is limited by the relatively low stability of the power mechanism, making it prone to deflection during bending, thus affecting processing accuracy. However, the above-described arrangement of the present invention allows the compression spring 322 to apply an inward squeezing force to the material-bearing portion 306 at the moment of stamping, thereby enabling the third upper block 217 contacting the material stop 305 above to effectively support the rear bending portion 30.

[0055] Furthermore, during the aforementioned stamping process, the airbag 501 connected to the lower inner end of the swing plate 208 will move upward accordingly, and the telescopic spring 211 will be in a stretched state, causing the volume of the airbag 501 to increase and a negative pressure to be formed inside. Under the action of the negative pressure, the debris formed by the folding blade block 209 during the stamping process of the bending plate 30 will enter the airbag 501 through the dust suction port 502 and the air suction pipe 503, thereby timely adsorbing away the debris formed during the stamping process and preventing other negative pressures formed during the stamping process from being carried to the surface of the mold.

[0056] III. Material preparation:

[0057] After stamping is completed, the telescopic cylinder 201 drives the upper template 202 to move upward, and the pressure plate 207 moves away from the far end of the swing plate 208. Under the elastic force of the stretched telescopic spring 211, the inner end of the swing plate 208 and the folding blade 209 on it will move downward, and the gas inside the airbag 501 will be squeezed, thereby expelling the debris in the airbag 501 along the exhaust pipe 504, so that the debris in the airbag 501 can be cleaned up in time. As the upper template 202 moves further upward, under the action of the power mechanism, the moving slide plate 304 will move the bent triangular plate 10 on it outward. During the outward movement, the bent plate 30 with three sides of the triangular plate 10 will be intercepted by the baffle plate 401. When the moving slide plate 304 is completely moved away from one side of the discharge port 402, the stamped triangular plate 10 that is limited will fall into the receiving frame 403 under the action of gravity.

[0058] The device of this invention, through the cooperation of the mold mechanism 2, the feeding mechanism 3, the unloading mechanism 4, and the dust removal mechanism 5, can simultaneously drive the feeding mechanism 3 to feed materials and achieve precise positioning of the triangular bent plate 10 to be stamped during the downward pressing of the upper template 202 of the mold mechanism 2. Through the linkage between the swing plate 208, the airbag 501, and the folding blade block 209, it can achieve the adsorption treatment of the debris formed at the stamping part at the moment of stamping by the mold mechanism 2, avoiding the negative pressure disturbance of debris during subsequent stamping, thus improving the stamping quality of the product. Moreover, compared with the traditional stamping structure, this structure adopts a reverse stamping method to complete the stamping, which simplifies the device. After the stamping is completed, during the upward reset of the upper template 202, on the one hand, the adsorbed debris is further collected and cleaned, and on the other hand, the triangular bent plate 10 is automatically unloaded after stamping, thereby improving the overall stamping and bending efficiency of the triangular bent plate 10.

[0059] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A counter-bending mechanism, characterized by: The utility model relates to a kind of triangular bending plate bending machine, including Workbench (1), one side of the workbench (1) is equipped with support plate (101); Die mechanism (2), it includes the upper die plate (202) driven lifting of telescopic cylinder (201) installation on the one side of the support plate (101) and the lower die plate (203) installation on the workbench (1) and the upper die plate (202) upper and lower confrontation, the lower surface of the upper die plate (202) is provided with molding into son (210) and upper support plate (212), the upper support plate (212) and the shape of the triangular plate (20) of triangular bending plate (10) is equivalent, several molding into son (210) are distributed around the upper support plate (212), the first upper stop block (204), the second upper stop block (205) and the third upper stop block (217) are respectively provided in the three edge interval folding knife groove (213) of the molding into son (210), the third upper stop block (217) is perpendicular to the incoming direction of triangular bending plate (10), the lower die plate (203) is provided with sliding slot (214) corresponding to the folding knife groove (213) above, folding knife block (209) is vertically slidably arranged in the sliding slot (214), the lower die plate (203) upper surface outside folding knife block (209) is provided with lower stop block (206) corresponding to the first upper stop block (204) and the second upper stop block (205) respectively, the upper die plate (202) and the lower die plate (203) are provided with counter mechanism, when the upper die plate (202) is down to the surface stamping position of the lower die plate (203), the counter mechanism can drive folding knife block (209) to go up and along folding knife groove (213) the bending part (30) of three edges of triangular bending plate (10) is bent upwards along the molding into son (210); Feeding mechanism (3), it includes the mobile sliding plate (304) slidably installed on the surface of workbench (1) and the limiting cylinder (301) suspendedly installed above the mobile sliding plate (304), the mobile sliding plate (304) includes the material blocking portion (305) located with the lower surface of the limiting cylinder (301) flush on the outside and the material receiving portion (306) located inside the material blocking portion (305) and sunken, the height of the material limiting groove (307) of the material receiving portion (306) is equivalent to the thickness of the triangular bending plate (10), the material receiving portion (306) can feed triangular bending plate (10) to the surface of the lower die plate (203) and position, the mobile sliding plate (304) is realized with the synchronous linkage of the upper die plate (202) by power mechanism, when the upper die plate (202) is down, the mobile sliding plate (304) moves to the direction of die mechanism (2), when the upper die plate (202) is up, the mobile sliding plate (304) moves reversely. The blanking mechanism (4) includes a blocking plate (401) installed on the top of the bending part (30) of the triangular bending plate (10) on the limiting material receiving part (306) above the workbench (1), a discharge port (402) opened on the workbench (1) directly below the blocking plate (401), and a material receiving frame (403) arranged below the discharge port (402).

2. A counter-bending mechanism according to claim 1, characterized in that: Further comprising a dust removal mechanism (5), which comprises a dust suction port (502) opened at the top end of the folding knife block (209), the top end of the dust suction port (502) is connected with an air bag (501) connected at the bottom of the folding knife block (209) through a suction pipe (503), the lower end of the air bag (501) is fixedly connected to the horizontal support plate (215) arranged below the lower die plate (203), a telescopic spring (211) is further connected between the bottom of the folding knife block (209) and the upper surface of the horizontal support plate (215), an exhaust pipe (504) is further connected to the air bag (501), a plurality of exhaust pipes (504) are connected to the same dust collection bag, a one-way inlet valve (505) is arranged on the suction pipe (503), and a one-way outlet valve (506) is arranged on the exhaust pipe (504).

3. The counter-bending mechanism according to claim 1, wherein: The anti-hitting mechanism includes a pressing rod (207) vertically installed on the lower surface of the upper die plate (202) and a swing plate (208) centrally hinged to the bottom surface of the lower die plate (203), the outer end of the swing plate (208) is vertically opposite to the pressing rod (207) above, the inner end of the swing plate (208) is connected to the lower end of the folding knife block (209), and the inner end of the swing plate (208) is connected to the top surface of the air bag (501).

4. The counter-bending mechanism of claim 1, wherein: The power mechanism includes a rack (309) arranged on the side wall of the top rod of the telescopic cylinder (201), one side of the rack (309) on the top end of the top rod is rotatably provided with a gear (310) meshing with the rack (309), the tail end of the workbench (1) is vertically installed with a mounting plate (314), the inner side of the mounting plate (314) is rotatably installed with a rotating arm (315), one side of the workbench (1) is rotatably installed with a transmission rod (313), the rotating shaft of the gear (310) and the transmission rod (313) are connected through a first pulley set (311), the rotating shaft of the rotating arm (315) and the transmission rod (313) are connected through a second pulley set (312), the distal end of the rotating arm (315) is provided with a first limiting ball groove (319), a first rotating ball (316) is rotatably installed in the first limiting ball groove (319), the distal end of the movable sliding plate (304) is provided with a second limiting ball groove (320), a second rotating ball (318) is rotatably installed in the second limiting ball groove (320), and the first rotating ball (316) and the second rotating ball (318) are connected through a connecting rod (317).

5. The counter-bending mechanism according to claim 1, wherein: The material blocking part (305) comprises two connecting blocks (321) connected by compression springs (322), one of the connecting blocks (321) is provided with a guide hole (323) on the inner side, and the other connecting block (321) is provided with a guide rod (324) extending into the guide hole (323).

6. The counter-bending mechanism of claim 1, wherein: The material receiving part (306) is provided with a through slot (216) on the surface of one side close to the material limiting groove (307), and the through slot (216) can pass through the corresponding folding knife block (209).

7. The counter-bending mechanism of claim 1, wherein: The height of the first upper blocking block (204) and the second upper blocking block (205) is greater than the height of the third upper blocking block (217).

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