Automatic bending device

Abstract

The present invention provides an automatic bending device, comprising: a support frame; a bending mechanism, comprising a first fixed seat, a lifting drive device, a transverse drive device and a roller; the first fixed seat is fixed to the support frame; the lifting drive device is fixed to the first fixed seat; the transverse drive device is connected to the output end of the lifting drive device; the roller is connected to the transverse drive device; a transfer mechanism is arranged below the bending mechanism; a positioning mechanism, comprising a second fixed seat, a positioning block and a positioning drive device, the second fixed seat is connected to the output end of the transfer mechanism; the positioning block is fixed to the second fixed seat; the positioning drive device is fixed to the second fixed seat. The roller is used to roll and bend the product. Compared with the original pressing block and the product having sliding friction, the roller of the present invention and the product have rolling friction, which reduces the scratch rate on the product surface.

Description

[Technical field]

[0001] The invention relates to an automatic bending device. [Background technology]

[0002] As a core component of consumer electronics such as smartphones and smart watches, lithium batteries have been developing in the direction of small size, high energy density, safety and reliability. The protection boards on lithium batteries are also becoming smaller and more sophisticated.

[0003] The nickel sheet protection plate of lithium batteries needs to be bent during the production process. Traditional technology relying on manual operation has been difficult to meet the product quality and production efficiency requirements. The research and development of high-precision fully automated equipment has become particularly important.

[0004] The existing bending mechanism uses a polyurethane pressing block to press the nickel sheet for bending, and the polyurethane pressing block will scratch the surface of the nickel sheet. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide an automatic bending device which adopts roller pressing to reduce friction and thus reduce the scratch rate of the product surface.

[0006] The present invention is implemented as follows: an automatic bending device, comprising:

[0007] Support frame;

[0008] The bending mechanism comprises a first fixed seat, a lifting drive device, a transverse drive device and a roller; the first fixed seat is fixed to the support frame; the lifting drive device is fixed to the first fixed seat; the transverse drive device is connected to the output end of the lifting drive device; the roller is connected to the transverse drive device;

[0009] A transfer mechanism, arranged below the bending mechanism;

[0010] The positioning mechanism comprises a second fixing seat, a positioning block and a positioning drive device, wherein the second fixing seat is connected to the output end of the transfer mechanism; the positioning block is fixed on the second fixing seat; and the positioning drive device is fixed on the second fixing seat.

[0011] Furthermore, the lifting drive device comprises:

[0012] A first cylinder is fixed to the first fixing seat, and the piston rod is arranged vertically;

[0013] The transverse mounting seat is fixedly connected to the piston rod of the first cylinder.

[0014] Furthermore, the traverse drive device comprises:

[0015] A roller fixing seat is connected to the transverse moving mounting seat in a horizontal and transverse sliding manner; the roller is connected to the roller fixing seat;

[0016] A first spring seat is provided with a horizontal first axis and is fixed to the transverse mounting seat and is located at one side of the roller fixing seat, with the first axis facing the roller fixing seat;

[0017] A return spring is sleeved on the first shaft, with one end abutting against the first spring seat and the other end abutting against the roller fixing seat;

[0018] The second cylinder is fixed to the transverse mounting seat and is located at the other side of the roller fixing seat, and the piston rod is horizontally and laterally facing the roller fixing seat.

[0019] Furthermore, the transverse driving device further comprises:

[0020] A first guide rail, fixedly connected to the transverse mounting seat in a horizontal and transverse direction;

[0021] The first sliding block is slidably connected to the first guide rail and fixedly connected to the roller fixing seat.

[0022] Furthermore, the transverse driving device further comprises:

[0023] A second spring seat, fixed to the transverse mounting seat;

[0024] A clamping rod, with a clamping head at the bottom, and vertically movably connected to the second spring seat; the diameter of the clamping head is larger than the diameter of the clamping rod;

[0025] A compression spring is sleeved on the compression rod, with the top end abutting against the second spring seat and the bottom end abutting against the compression head.

[0026] Furthermore, there are two transverse driving devices, which are symmetrically arranged, and the two rollers are coaxially arranged in the horizontal direction;

[0027] There are two positioning mechanisms, which are located below the transverse driving device in a one-to-one correspondence.

[0028] Furthermore, it also includes

[0029] A third fixing seat, fixedly connected to the output end of the transfer mechanism;

[0030] A variable pitch motor, fixedly connected to the third fixing seat;

[0031] A transmission assembly connected to the output end of the variable pitch motor;

[0032] The second fixing seat of one of the positioning mechanisms is fixedly connected to the third fixing seat; the second fixing seat of the other positioning mechanism is movably connected to the third fixing seat and connected to the transmission assembly;

[0033] The structures of the two second fixing seats are the same or different.

[0034] Furthermore, it also includes:

[0035] A second guide rail, fixedly connected to the third fixing seat in a horizontal and transverse direction;

[0036] The second sliding block is slidably connected to the second guide rail and fixedly connected to the movable second fixing seat.

[0037] Furthermore, the positioning block is provided with a receiving groove with an open top and a side, and the receiving groove has a first positioning surface and a second positioning surface which are perpendicular to each other.

[0038] Furthermore, the positioning drive device comprises:

[0039] A third cylinder, fixedly connected to the second fixing seat and vertically facing the first positioning surface;

[0040] A side thrust block fixedly connected to the piston rod of the third cylinder;

[0041] a fourth cylinder, fixedly connected to the second fixing seat and vertically facing the second positioning surface;

[0042] The push block is fixedly connected to the piston rod of the fourth cylinder.

[0043] The advantages of the present invention are: an automatic bending device, comprising: a support frame; a bending mechanism, comprising a first fixed seat, a lifting drive device, a transverse drive device and a roller; the first fixed seat is fixed to the support frame; the lifting drive device is fixed to the first fixed seat; the transverse drive device is connected to the output end of the lifting drive device; the roller is connected to the transverse drive device; a transfer mechanism is arranged below the bending mechanism; a positioning mechanism, comprising a second fixed seat, a positioning block and a positioning drive device, the second fixed seat is connected to the output end of the transfer mechanism; the positioning block is fixed to the second fixed seat; the positioning drive device is fixed to the second fixed seat. The roller is used to roll and bend the product. Compared with the original pressing block and the product having sliding friction, the roller of the present invention and the product have rolling friction, which reduces the scratch rate on the product surface.

Brief Description of the Drawings

[0044] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0045] Figure 1It is a three-dimensional automatic bending device of the present invention. Figure 1 .

[0046] Figure 2 It is a three-dimensional automatic bending device of the present invention. Figure 2 .

[0047] Figure 3 The three-dimensional bending mechanism of the present invention Figure 1 .

[0048] Figure 4 The three-dimensional bending mechanism of the present invention Figure 2 .

[0049] Figure 5 It is a three-dimensional diagram of an embodiment of the transfer mechanism of the present invention.

[0050] Figure 6 It is a three-dimensional positioning mechanism of the present invention. Figure 1 .

[0051] Figure 7 It is a three-dimensional positioning mechanism of the present invention. Figure 2 .

[0052] Figure 8 It is a schematic diagram of the bending state of an automatic bending device of the present invention.

[0053] Fig. 9 yes Figure 8 A local enlarged schematic diagram of point A in the middle.

[0054] Fig.10 It is a three-dimensional positioning mechanism of the present invention. Figure 3 .

[0055] Fig.11 It is a three-dimensional positioning mechanism of the present invention. Figure 4 .

[0056] Fig.12 It is a top view of the positioning mechanism of the present invention.

[0057] Fig.13 It is a three-dimensional positioning mechanism of the present invention. Figure 5 .

[0058] Description of reference numerals:

[0059] Support frame 1;

[0060] Bending mechanism 2, first fixed seat 21, lifting drive device 22, first cylinder 221, lateral movement mounting seat 222, lateral movement drive device 23, roller 24, roller fixed seat 231, first spring seat 232, first shaft 2321, return spring 233, second cylinder 234, first guide rail 235, first slider 236, second spring seat 237, clamping rod 238, clamping head 2381, clamping spring 239;

[0061] Transfer mechanism 3;

[0062] Positioning mechanism 4, second fixing seat 41, positioning block 42, accommodating groove 421, first positioning surface 422, second positioning surface 423, first positioning block 424, air suction hole 4241, second positioning block 425, positioning drive device 43, third cylinder 431, side push block 432, fourth cylinder 433, rear push block 434;

[0063] The third fixing seat 5;

[0064] Variable pitch motor 6;

[0065] Transmission assembly 7, screw rod 71, nut 72, connecting block 73;

[0066] Second guide rail 8;

[0067] A second slider 9;

[0068] Nickel sheet protection plate 100. [Specific implementation method]

[0069] In the description of the present invention, it is necessary to understand that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The overall concept of the present invention is as follows:

[0072] (1) The roller 24 is used to roll and bend the product. Compared with the sliding friction between the original pressing block and the product, the roller 24 of the present invention and the product have rolling friction, which reduces the scratch rate on the product surface.

[0073] (2) Two positioning mechanisms 4 and two transverse driving devices 23 correspond to two workstations and can bend two products at the same time, thereby improving production efficiency.

[0074] (3) The positioning mechanism 4 is positioned on the two sides of the product, and the compression spring 239 presses the product at the top to prevent the product from tilting during the bending process.

[0075] (4) The return spring 233 presses against the roller fixing seat 231 and applies a pre-tightening force to the roller 24, so that the roller 24 always sticks to the product during the bending process, thereby avoiding the roller 24 and the product not being pressed into place properly during the bending process due to the tolerance of the product sizes, resulting in poor bending.

[0076] (5) The piston rod of the second cylinder 234 and the roller fixing seat 231 are only in contact but not connected. Therefore, after the bending is completed, when the piston rod of the second cylinder 234 is extended, it pushes against the roller fixing seat 231 to drive the roller 24 to separate from the product, so that when the lifting drive device 22 drives the roller 24 to rise and reset, the roller 24 does not contact the product, avoiding scratching the product due to extra contact. After rising to the right position, the piston rod of the second cylinder 234 is reset and retracted, and the roller fixing seat 231 is pushed against and slid by the reset spring 233 to reset.

[0077] See also Figures 1 to 13 shown.

[0078] An automatic bending device, comprising:

[0079] Support frame 1;

[0080] The bending mechanism 2 includes a first fixed seat 21, a lifting drive device 22, a transverse drive device 23 and a roller 24; the first fixed seat 21 is fixed to the support frame 1; the lifting drive device 22 is fixed to the first fixed seat 21; the transverse drive device 23 is connected to the output end of the lifting drive device 22; the roller 24 is connected to the transverse drive device 23; the transverse drive device 23 drives the roller 24 to press or loosen the product, and the lifting drive device 22 drives the roller 24 to roll downward to bend the product. Compared with the sliding friction between the original pressing block and the product, the roller 24 of the present invention and the product have rolling friction, which reduces the scratch rate on the product surface.

[0081] The transfer mechanism 3 is arranged below the bending mechanism 2; the transfer mechanism 3 can adopt an existing linear slide.

[0082] The positioning mechanism 4 includes a second fixed seat 41 , a positioning block 42 and a positioning drive device 43 . The second fixed seat 41 is connected to the output end of the transfer mechanism 3 ; the positioning block 42 is fixed on the second fixed seat 41 ; and the positioning drive device 43 is fixed on the second fixed seat 41 .

[0083] The lifting drive device 22 comprises:

[0084] The first cylinder 221 is fixed to the first fixing seat 21, and the piston rod is arranged vertically;

[0085] The transverse mounting seat 222 is fixedly connected to the piston rod of the first cylinder 221 .

[0086] The transverse driving device 23 comprises:

[0087] The roller fixing seat 231 is connected to the transverse mounting seat 222 in a horizontal and transverse sliding manner; the roller 24 is connected to the roller fixing seat 231; in a specific implementation, a bolt can be passed through the roller 24 to lock the roller fixing seat 231 without locking it; of course, a bearing can also be installed in the rolling, and the bearing is nested on the bolt, so that the roller 24 rotates more smoothly. Alternatively, the roller 24 can directly use a bearing.

[0088] The first spring seat 232 is provided with a horizontal first shaft 2321 and is fixed to the transverse mounting seat 222 and is located at one side of the roller fixing seat 231 , and the first shaft 2321 faces the roller fixing seat 231 ;

[0089] A return spring 233 is sleeved on the first shaft 2321, with one end abutting against the first spring seat 232 and the other end abutting against the roller fixing seat 231;

[0090] The second cylinder 234 is fixed to the transverse mounting seat 222 and is located at the other side of the roller fixing seat 231 , with the piston rod thereof horizontally facing the roller fixing seat 231 .

[0091] The transverse driving device 23 further comprises:

[0092] A first guide rail 235 is fixedly connected to the transverse mounting seat 222 in a horizontal and transverse direction;

[0093] The first sliding block 236 is slidably connected to the first guide rail 235 and fixedly connected to the roller fixing seat 231 .

[0094] The transverse driving device 23 further comprises:

[0095] A second spring seat 237, fixed to the transverse mounting seat 222;

[0096] The clamping rod 238 has a clamping head 2381 at the bottom thereof and is vertically movably connected to the second spring seat 237; the diameter of the clamping head 2381 is larger than the diameter of the clamping rod 238;

[0097] The pressing spring 239 is sleeved on the pressing rod 238 , with the top end abutting against the second spring seat 237 and the bottom end abutting against the pressing head 2381 .

[0098] There are two transverse driving devices 23, which are arranged symmetrically, and the two rollers 24 are coaxially arranged in the horizontal direction;

[0099] There are two positioning mechanisms 4, which are located one by one below the transverse driving device 23. Corresponding to two workstations, two products can be bent at the same time, thereby improving production efficiency.

[0100] In a specific implementation, the two positioning mechanisms 4 can be arranged with a fixed spacing, and the spacing of the two rollers 24 can be matched. This method can adapt to manual feeding, or automatic feeding, when the spacing of the two products in the material frame, the spacing of the two products on the grabbing tooling and the spacing of the two rollers 24 are all matched, that is, there is no need to adjust the spacing. An adjustable spacing arrangement can also be adopted. In the embodiment shown in the accompanying drawings, a variable spacing is achieved by using a variable pitch motor 6 and a transmission assembly 7. This method can adapt to the situation that the spacing of the two products or the spacing of the grabbing tooling is not equal to the spacing of the rollers 24 during automatic feeding. At this time, the spacing of the two positioning mechanisms 4 can be adjusted to be equal to the spacing of the products, and the feeding is carried out. After completion, the spacing of the two positioning mechanisms 4 is adjusted to match the spacing of the two rollers 24, and then bending is carried out. This arrangement can be selected according to the actual situation.

[0101] Also includes

[0102] A third fixing seat 5, fixedly connected to the output end of the transfer mechanism 3;

[0103] A variable pitch motor 6, fixedly connected to the third fixing base 5;

[0104] The transmission assembly 7 is connected to the output end of the variable pitch motor 6; in a specific embodiment, the transmission assembly 7 includes a screw 71, a nut 72, and a connecting block 73; the output shaft of the variable pitch motor 6 is fixedly connected to the screw 71, the nut 72 is threadedly connected to the screw 71, the screw 71 passes through the connecting block 73 and is clearance-fitted, and the connecting block 73 is respectively fixedly connected to the nut 72 and the second fixing seat 41; thus, the variable pitch motor 6 drives the screw 71 to rotate, drives the nut 72 to move in a straight line, and then drives the connecting block 73 to move in a straight line, and finally drives the second fixing seat 41 to move, so as to achieve variable pitch. In a specific embodiment, the variable pitch motor 6, the screw 71 and the nut 72 can adopt an integrated electric cylinder.

[0105] The second fixing seat 41 of one of the positioning mechanisms 4 is fixedly connected to the third fixing seat 5; the second fixing seat 41 of the other positioning mechanism 4 is movably connected to the third fixing seat 5 and connected to the transmission assembly 7;

[0106] The structures of the two second fixing seats 41 are the same or different.

[0107] Also includes:

[0108] The second guide rail 8 is fixedly connected to the third fixing seat 5 in a horizontal and transverse direction;

[0109] The second sliding block 9 is slidably connected to the second guide rail 8 , and is fixedly connected to the movable second fixing seat 41 .

[0110] The positioning block 42 is provided with a receiving groove 421 with an open top and side, and the receiving groove 421 has a first positioning surface 422 and a second positioning surface 423 perpendicular to each other. In a specific embodiment, the positioning block 42 can also adopt a split first positioning block 424 and a second positioning block 425, the first positioning block 424 is provided with a groove, the second positioning block 425 is fixed in the groove, and the first positioning block 424 and the first positioning block 424 form the receiving groove 421, the first positioning surface 422 is located on the inner side of the second positioning block 425; the second positioning surface 423 is located on the inner side of the first positioning block 424; in this case, the first positioning block 424 can be made of metal, such as steel, and the second positioning block 425 can be made of plastic, so that when the push-back block 434 pushes the product for positioning, the first positioning surface 422 can be reduced from scratching the side of the product.

[0111] In a specific embodiment, a suction hole 4241 may be opened in the groove of the first positioning block 424. The suction hole 4241 is connected to the suction cup to suck air into the product and further hold the product, making the product more firm and less likely to move during the bending process.

[0112] The positioning drive device 43 comprises:

[0113] A third cylinder 431 is fixedly connected to the second fixing seat 41 and vertically faces the first positioning surface 422;

[0114] The side push block 432 is fixedly connected to the piston rod of the third cylinder 431; the third cylinder 431 drives the side push block 432 to push the product against the first positioning surface 422;

[0115] The fourth cylinder 433 is fixedly connected to the second fixing seat 41 and vertically faces the second positioning surface 423;

[0116] The push block 434 is fixedly connected to the piston rod of the fourth cylinder 433. The fourth cylinder 433 drives the push block 434 to push the product against the second positioning surface 423. The first positioning surface 422 is combined to limit the product in the horizontal direction, and the product is pressed at the top by the compression spring 239, so as to fix the product and prevent the product from tilting or moving during the bending process.

[0117] Specific usage:

[0118] Automatic feeding mechanism can be used for feeding, such as robot + suction tooling, and each cylinder, variable pitch motor 5 and transfer mechanism 3 of the present invention can be connected to PLC for unified control. Manual feeding can also be used, and it can be arranged according to actual conditions. As follows, taking automatic feeding as an example, the product is a nickel sheet protection plate 100: the automatic feeding mechanism can use an existing one or redesign a new one.

[0119] The program is preset and PLC is used for unified control.

[0120] ① Control the automatic feeding mechanism to put two nickel sheet protection plates 100 into the receiving groove 421 of the positioning block, and the suction holes 4241 on the positioning block 42 suck the nickel sheet protection plates 100; the part of the nickel sheet protection plates 100 to be bent extends out of the positioning block 42 and is in a suspended state. If manual feeding is used, the product can be manually placed in the receiving groove 421 between the steps.

[0121] ② Control the third cylinder 431 to drive the side push block 432 to push the product against the first positioning surface 422;

[0122] ③ Control the fourth cylinder 433 to drive the push block 434 to push the product against the second positioning surface 423;

[0123] ④ Control the variable pitch motor 5 to drive or move the nickel sheet protection plate on the movable positioning mechanism 4 to move so that the center distance between the two nickel sheet protection plates is the same as the center distance between the two rollers 24; if manual loading is adopted, this step can be omitted, and the spacing can be adjusted in advance, and no further adjustment is required in the subsequent production process.

[0124] ⑤ Control the transplanting mechanism 3 to drive the positioning mechanism 4 to move below the bending mechanism 2;

[0125] ⑥ Control the piston rod of the first cylinder 221 to descend, the compression spring 239 presses the nickel sheet protection plate, and then the roller 24 contacts the suspended part of the nickel sheet protection plate 100 to be bent, and continues to descend to bend the nickel sheet protection plate downward by 90°;

[0126] ⑦ Control the piston rod of the second cylinder 234 to extend, press against the roller fixing seat 231 to drive the roller 24 and the nickel sheet protection plate 100 to separate;

[0127] ⑧ Control the piston rod of the first cylinder 221 to rise and reset, and then control the piston rod of the second cylinder 234 to retreat and reset;

[0128] ⑨ Control the transplanting mechanism 3 to drive the positioning mechanism 4 to move away from the bottom of the bending mechanism 2, control the third cylinder 431 and the fourth cylinder 433 to return to their original positions, stop the suction hole 4241 from sucking air, and then remove the nickel sheet protection plate 100; then the next group of products can be bent.

[0129] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An automatic bending device, Features: include: Support frame; The bending mechanism comprises a first fixed seat, a lifting drive device, a lateral drive device and a roller; the first fixed seat is fixed to the support frame; The lifting drive device is fixed to the first fixing seat; the lateral movement drive device is connected to the output end of the lifting drive device; the roller is connected to the lateral movement drive device; A transfer mechanism, arranged below the bending mechanism; The positioning mechanism comprises a second fixing seat, a positioning block and a positioning drive device, wherein the second fixing seat is connected to the output end of the transfer mechanism; The positioning block is fixed on the second fixing seat; the positioning drive device is fixed on the second fixing seat; The lifting drive device comprises: A first cylinder is fixed to the first fixing seat, and the piston rod is arranged vertically; A transverse mounting seat fixedly connected to the piston rod of the first cylinder; The traverse drive device comprises: A roller fixing seat is connected to the transverse moving mounting seat in a horizontal and transverse sliding manner; the roller is connected to the roller fixing seat; A first spring seat is provided with a horizontal first axis and is fixed to the transverse mounting seat and is located at one side of the roller fixing seat, with the first axis facing the roller fixing seat; A return spring is sleeved on the first shaft, with one end abutting against the first spring seat and the other end abutting against the roller fixing seat; A second cylinder is fixed to the transverse mounting seat and is located on the other side of the roller mounting seat, with the piston rod horizontally facing the roller mounting seat; The traverse drive device also includes: A first guide rail, fixedly connected to the transverse mounting seat in a horizontal and transverse direction; A first sliding block, slidably connected to the first guide rail and fixedly connected to the roller fixing seat; The traverse drive device also includes: A second spring seat, fixed to the transverse mounting seat; A clamping rod, with a clamping head at the bottom, and vertically movably connected to the second spring seat; the diameter of the clamping head is larger than the diameter of the clamping rod; A compression spring is sleeved on the compression rod, with the top end abutting against the second spring seat and the bottom end abutting against the compression head.

2. An automatic bending device as claimed in claim 1, Features: There are two transverse driving devices, which are arranged symmetrically, and the two rollers are coaxially arranged in the horizontal direction; There are two positioning mechanisms, which are located below the transverse driving device in a one-to-one correspondence.

3. An automatic bending device as claimed in claim 2, Features: Also includes A third fixing seat, fixedly connected to the output end of the transfer mechanism; A variable pitch motor, fixedly connected to the third fixing seat; A transmission assembly connected to the output end of the variable pitch motor; The second fixing seat of one of the positioning mechanisms is fixedly connected to the third fixing seat; the second fixing seat of the other positioning mechanism is movably connected to the third fixing seat and connected to the transmission assembly; Wherein, the structures of the two second fixing seats are the same or different.

4. An automatic bending device as claimed in claim 3, Features: Also includes: A second guide rail, fixedly connected to the third fixing seat in a horizontal and transverse direction; The second sliding block is slidably connected to the second guide rail and fixedly connected to the movable second fixing seat.

5. An automatic bending device as claimed in claim 1, Features: The positioning block is provided with a receiving groove with an open top and a side, and the receiving groove has a first positioning surface and a second positioning surface that are perpendicular to each other.

6. An automatic bending device as claimed in claim 5, Features: The positioning drive device comprises: A third cylinder, fixedly connected to the second fixing seat and vertically facing the first positioning surface; A side thrust block fixedly connected to the piston rod of the third cylinder; a fourth cylinder, fixedly connected to the second fixing seat and vertically facing the second positioning surface; The push block is fixedly connected to the piston rod of the fourth cylinder.

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