Auxiliary positioning device of bending machine

Abstract

The utility model discloses a bending machine auxiliary positioning device which comprises a shell, an air cylinder is fixedly connected to the upper portion of the shell, an output shaft of the air cylinder penetrates through the shell, an upper die is fixedly connected to the output shaft of the air cylinder, a lower die and an inclination mechanism are arranged on the inner side of the shell, the inclination mechanism is arranged on the inner side of the shell, and a clamping mechanism is arranged below the inclination mechanism. According to the metal plate clamping device, the upper clamping plate is driven to move through rotation of the one-way screw rod, a metal plate is clamped through the lower clamping plate and the upper clamping plate, meanwhile, through arrangement of the rotating rod, the lower clamping plate and the upper clamping plate can incline along with tilting of the metal plate, and the metal plate is clamped through the limiting mechanism; and through sliding connection between the connecting rod and the hollow rod and sliding of the sliding groove in the sliding block, the influence caused when the metal plate is tilted can be reduced under the condition that the upper clamping plate can clamp and limit the metal plate.

Description

Technical Field

[0001] The present application relates to the technical field of bending machine positioning, and in particular to an auxiliary positioning device for a bending machine. Background Art

[0002] A bending machine is a device used to bend metal and other materials. It is used in sheet metal processing, metal plate forming and other fields. It is mainly used to bend and form metal sheets. This machine can bend flat materials into the desired shape by applying force. It is usually used to manufacture various metal components and parts, such as boxes, casings, pallets, etc. The basic principle of a bending machine is to apply force to make the metal sheet undergo plastic deformation to achieve the desired shape. In this process, the metal sheet is usually clamped in the machine, and then force is applied through upper and lower molds or tools to bend the metal sheet.

[0003] The utility model with announcement number CN216443046U discloses an auxiliary positioning device for the oblique bending mechanism of a bending machine. The beneficial effect of the utility model is that the workpiece is manually placed on the machine table, and then the workpiece is pushed to the inner side of the shell, and two symmetrically arranged screw rods are manually driven to rotate. Since the screw rods are threadedly connected to the sliders, and the guide rods penetrate the sliders, when the screw rods rotate along the pointer, the two symmetrically arranged sliders will cooperate with the guide rods to move toward each other. While the sliders move, they will drive the metal grooves to move synchronously through the connecting rods, so that the guide rollers on the inner side of the metal grooves are in contact with the outer wall of the workpiece, and the workpiece is tightened and positioned. When the workpiece is pushed to the bending groove, the guide rollers can rotate according to the movement of the workpiece. Under the action of the auxiliary positioning device, the workpiece can be prevented from being offset during the bending process, thereby ensuring the stability of the workpiece during the bending process.

[0004] When the above technical scheme is in use, the metal plate is clamped by the guide roller, and the rotation of the guide roller is used to make the metal plate smoothly used when being pushed, so as to realize the placement and limitation of the metal plate. However, when the metal plate is bent, the two sides of the metal plate will bend and warp with the bending point as the center. Although the guide roller can realize the movement of the metal plate, it can only rotate horizontally. This makes it possible for the guide roller to affect and hinder the bending and warping of the metal plate when being bent, which may affect the angle of the metal plate after being bent and formed, making it impossible to use the metal plate smoothly. Therefore, those skilled in the art provide a bending machine auxiliary positioning device to solve the problems raised in the above background technology. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the present application provides an auxiliary positioning device for a bending machine.

[0006] The auxiliary positioning device for a bending machine provided in this application adopts the following technical solution:

[0007] An auxiliary positioning device for a bending machine comprises a housing, a cylinder is fixedly connected to the upper part of the housing, an output shaft of the cylinder passes through the housing, an upper mold is fixedly connected to the output shaft of the cylinder, and a lower mold is arranged on the inner side of the housing;

[0008] A tilting mechanism is arranged on the inner side of the shell, and a clamping mechanism is arranged below the tilting mechanism, and the clamping mechanism is used to clamp the material;

[0009] A limiting mechanism is arranged on the inner side of the shell, and the limiting mechanism is arranged below the clamping mechanism, and the limiting mechanism is used to limit the material.

[0010] In some embodiments, the clamping mechanism includes a lower clamping plate arranged on the inner side of the shell, both sides of the lower clamping plate are fixedly connected with mounting plates, a first limit rod is fixedly connected to the top of one of the mounting plates, a one-way screw is rotatably connected to the top of the other mounting plate, an upper clamping plate is arranged above the lower clamping plate, both sides of the upper clamping plate are fixedly connected with connecting plates, one of the connecting plates is threadedly connected to the outside of the one-way screw, and the other connecting plate is slidably connected to the outside of the first limit rod;

[0011] The tilting mechanism includes a rotating rod rotatably connected to the top of the mounting plate, a connecting rod rotatably connected to the outer side of the rotating rod, a hollow rod slidably connected to the top of the connecting rod, and the hollow rod is slidably connected to the outer side of the connecting rod, a sliding block is provided on the inner side of the shell, the shell is located inside the slider and is slidably connected to a sliding groove, an arc block is fixedly connected below the sliding groove, and the hollow rod is rotatably connected to the arc block.

[0012] In some embodiments, the limiting mechanism includes a connecting hollow block fixedly connected to the lower portion of the upper clamping plate, and two connecting hollow blocks are provided, one of which is rotatably connected to a bidirectional screw rod, and the other is fixedly connected to a second limiting rod, and the outer side of the connecting hollow block is threadedly connected to a first limiting plate and a second limiting plate, and the first limiting plate and the second limiting plate are both slidably connected to the outer side of the second limiting rod.

[0013] In some embodiments, the housing is located inside the sliding block and is fixedly connected to a fixing rod, and the sliding groove is slidably connected to the outside of the fixing rod.

[0014] In some embodiments, a fixing block is fixedly connected to the inner side of the shell, and the fixing block is arranged below the lower clamping plate. An extension plate is fixedly connected to one side of the first limiting plate and the second limiting plate.

[0015] In some embodiments, the hollow rod is fixedly connected to a limiting block inside, a limiting groove is opened on one side of the connecting rod, the limiting block is arranged on the inner side of the limiting groove, and the connecting rod is slidably connected to the outer side of the limiting block.

[0016] In summary, this application includes the following beneficial technical effects:

[0017] (1) In the present application, the upper clamping plate is driven to move by the rotation of the one-way screw, and the lower clamping plate and the upper clamping plate are used to clamp the metal plate. After the metal plate is clamped, the two-way screw can be rotated again to achieve lateral limitation of the metal plate, thereby reducing the possibility of shaking when the metal plate is bent. At the same time, the setting of the rotating rod enables the lower clamping plate and the upper clamping plate to tilt as the metal plate tilts, and through the sliding connection between the connecting rod and the hollow rod, and the sliding of the slide groove inside the slider, the upper clamping plate can reduce the impact caused by the tilting of the metal plate while achieving clamping and limiting the metal plate.

[0018] (2) The fixed block in the present application can play a certain supporting role on the lower clamping plate, so that when the lower clamping plate and the upper clamping plate complete the clamping of the metal plate, the upper clamping plate and the lower clamping plate are not likely to exert downward pressure on the metal plate due to lack of support, thereby reducing the bending of the metal plate due to the pressure of the lower clamping plate and the upper clamping plate. The extension plate can further increase the range of the first limiting plate and the second limiting plate that can limit the metal plate, so that when the metal plate is small, the metal plate can still be limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the overall structure in the embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a side cross-section structure of an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of the first screw in the embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the structure of connecting hollow blocks in an embodiment of the present application;

[0023] Figure 5 In the embodiment of this application Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Explanation of the accompanying drawings: 1. Shell; 2. Cylinder; 3. Upper mold; 4. Lower mold; 5. Clamping mechanism; 51. Lower clamping plate; 52. Upper clamping plate; 53. Mounting plate; 54. Connecting plate; 55. One-way screw; 56. First limiting rod; 6. Tilting mechanism; 61. Rotating rod; 62. Connecting rod; 63. Hollow rod; 64. Arc block; 65. Slider; 66. Slide groove; 7. Limiting mechanism; 71. Connecting hollow block; 72. Two-way screw; 73. Second limiting rod; 74. First limiting plate; 75. Second limiting plate; 8. Fixing rod; 9. Extension plate; 10. Fixing block; 11. Limiting block; 12. Limiting groove. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] The present application embodiment discloses an auxiliary positioning device for a bending machine. Figure 1-5 , an auxiliary positioning device for a bending machine, comprising a shell 1, a tilting mechanism 6 and a limiting mechanism 7, a cylinder 2 is fixedly connected to the top of the shell 1, the output shaft of the cylinder 2 passes through the shell 1, an upper mold 3 is fixedly connected to the output shaft of the cylinder 2, a lower mold 4 is arranged on the inner side of the shell 1, the tilting mechanism 6 is arranged on the inner side of the shell 1, a clamping mechanism 5 is arranged below the tilting mechanism 6, the clamping mechanism 5 is used to clamp materials, a limiting mechanism 7 is arranged on the inner side of the shell 1, and the limiting mechanism 7 is arranged below the clamping mechanism 5, and the limiting mechanism 7 is used to limit materials;

[0027] In this way, during the implementation process, when the staff needs to bend the metal plate, the metal plate to be folded can be placed above the lower mold 4, and when placing it, the metal plate can be effectively and stably clamped by the clamping mechanism 5, and at the same time, the limiting mechanism 7 can play the role of an auxiliary clamping mechanism 5, while clamping the metal plate, increasing the limiting effect on the metal plate, so as to reduce the horizontal tilting and shaking of the metal plate when it is bent and placed, thereby increasing the stability of the metal plate when it is bent. At the same time, the metal plate will bend and warp when it is bent, and the setting of the tilting mechanism 6 can make the clamping mechanism 5 and the limiting mechanism 7 continue to limit and clamp the metal plate when the metal plate is bent, thereby reducing the possibility of obstruction when the metal plate is bent, and increasing the overall stability of the metal plate when it is bent.

[0028] At the same time, after the metal is restricted by the clamping mechanism 5 and the limiting mechanism 7, the staff can start the cylinder 2, and the cylinder 2 can drive the upper mold 3 to move downward through its connection with the upper mold 3. After the upper mold 3 moves down to a certain distance, it will contact the metal plate, and through the operation of the cylinder 2, the metal plate can be extruded and bent, thereby improving the forming rate of the metal plate.

[0029] The clamping mechanism 5 includes a lower clamping plate 51 arranged on the inner side of the housing 1, and mounting plates 53 are fixedly connected on both sides of the lower clamping plate 51, a first limit rod 56 is fixedly connected to the top of one of the mounting plates 53, and a one-way screw 55 is rotatably connected to the top of the other mounting plate 53, an upper clamping plate 52 is arranged above the lower clamping plate 51, and connecting plates 54 are fixedly connected on both sides of the upper clamping plate 52, one of the connecting plates 54 is threadedly connected to the outer side of the one-way screw 55, and the other connecting plate 54 is slidably connected to the outer side of the first limit rod 56;

[0030] The lower clamping plate 51 can smoothly connect the one-way screw 55 and the first limiting rod 56 while installing and fixing the two mounting plates 53. The rotational connection between the one-way screw 55 and one of the mounting plates 53 allows the mounting plate 53 to rotate smoothly. At the same time, the one-way screw 55 and the first limiting rod 56 can realize the connection with the upper clamping plate 52 through the two connecting plates 54. The first limiting rod 56 can realize the limit of the upper clamping plate 52 by connecting itself with one of the connecting plates 54. The one-way screw 55 can drive the upper clamping plate 52 to move up and down when rotating through the threaded connection between itself and the other connecting plate 54.

[0031] When it is necessary to limit the position of the metal plate, it is only necessary to rotate the one-way screw 55 to limit the upper clamping plate 52 through the first limiting rod 56, thereby driving the upper clamping plate 52 to move to one side of the lower clamping plate 51. After the upper clamping plate 52 moves down to a certain distance, it can smoothly fit with the metal plate placed above the lower clamping plate 51, thereby cooperating with the lower clamping plate 51 to clamp the metal plate and improve the stability of the metal plate when being bent.

[0032] Preferably, the tilt mechanism 6 includes a rotating rod 61 rotatably connected to the top of the mounting plate 53, a connecting rod 62 is rotatably connected to the outer side of the rotating rod 61, a hollow rod 63 is slidably connected to the top of the connecting rod 62, and the hollow rod 63 is slidably connected to the outer side of the connecting rod 62, a slider 65 is provided on the inner side of the housing 1, a slide groove 66 is slidably connected to the housing 1 inside the slide groove 65, an arc block 64 is fixedly connected below the slide groove 66, and the hollow rod 63 is rotatably connected to the arc block 64;

[0033] The rotating rod 61 can be used to connect the upper clamping plate 52 and the connecting rod 62. At the same time, the rotating rod 61 can be connected to the upper clamping plate 52 and the connecting rod 62 through the rotation connection between itself and the upper clamping plate 52 and the connecting rod 62, so that the connecting rod 62 can be smoothly rotated above the upper clamping plate 52. At the same time, the connecting rod 62 can be connected to the arc block 64 through the hollow rod 63. When the metal plate bends due to bending, it will drive the upper clamping plate 52 to bend upward together. At this time, the upper clamping plate 52 will drive the connecting rod 62 to move inside the hollow rod 63 through the connection between itself and the connecting rod 62, thereby reducing the obstruction to the bending and warping of the metal plate.

[0034] The arc block 64 is used to connect the hollow rod 63 and the slide groove 66. The opening of the slider 65 allows the slide groove 66 to slide smoothly inside the shell 1. The setting of the arc block 64 can further effectively reduce the obstruction and influence of the hollow rod 63 on the bending of the metal plate. At the same time, the sliding of the slide groove 66 inside the slider 65 can enable the upper clamping plate 52 to effectively and stably limit the metal plate when the metal plate is bent or warped, and it is not easy to affect the warping of the metal plate, thereby increasing the yield rate of the metal plate.

[0035] Specifically, the limiting mechanism 7 includes a connecting hollow block 71 fixedly connected to the lower side of the upper clamping plate 52, and two connecting hollow blocks 71 are provided, one of which is rotatably connected to a bidirectional screw 72, and the other is fixedly connected to a second limiting rod 73, and the outer side of the connecting hollow block 71 is threadedly connected to a first limiting plate 74 and a second limiting plate 75, and the first limiting plate 74 and the second limiting plate 75 are both slidably connected to the outer side of the second limiting rod 73;

[0036] The two connecting hollow blocks 71 can be used to connect the bidirectional screw 72 and the second limiting rod 73. At the same time, the threads on both sides of the connecting hollow block 71 are opposite. At the same time, the rotation connection between the connecting hollow block 71 and the bidirectional screw 72 allows the bidirectional screw 72 to rotate smoothly. The second limiting rod 73 can smoothly connect and slide the first limiting plate 74 and the second limiting plate 75.

[0037] When the bidirectional screw 72 rotates, it can smoothly drive the first limit plate 74 and the second limit plate 75 to move in opposite directions through the opposite rotation of the threads on both sides of itself and the limitation of the first limit plate 74 and the second limit plate 75 by the second limit rod 73. After the first limit plate 74 and the second limit plate 75 move to a certain distance, they can play the role of assisting the clamping mechanism 5, further improving the stability of the metal plate when being bent.

[0038] Specifically, the housing 1 is fixedly connected to a fixing rod 8 inside the slider 65, and the slide groove 66 is slidably connected to the outside of the fixing rod 8;

[0039] The shell 1 can install and fix the fixing rod 8 through the slider 65, and the fixing rod 8 can limit the slide groove 66, so that when the slide groove 66 moves due to the warping and bending of the metal plate, it can slide more smoothly inside the slider 65, thereby increasing the stability of the slide groove 66 when sliding.

[0040] Further, more specifically, a fixing block 10 is fixedly connected to the inner side of the housing 1, and the fixing block 10 is arranged below the lower clamping plate 51, and one side of the first limiting plate 74 and the second limiting plate 75 are fixedly connected to an extension plate 9;

[0041] The fixing block 10 can play a certain supporting role on the lower clamping plate 51, so that when the lower clamping plate 51 and the upper clamping plate 52 complete the clamping of the metal plate, the upper clamping plate 52 and the lower clamping plate 51 are not easy to apply downward pressure to the metal plate due to lack of support, thereby reducing the bending of the metal plate due to the pressure of the lower clamping plate 51 and the upper clamping plate 52. The extension plate 9 can further increase the range of the first limiting plate 74 and the second limiting plate 75 that can limit the metal plate, so that when the metal plate is small, the metal plate can still be limited.

[0042] Furthermore, the inner part of the hollow rod 63 is fixedly connected to the limit block 11, a limit slot 12 is provided on one side of the connecting rod 62, the limit block 11 is arranged on the inner side of the limit slot 12, and the connecting rod 62 is slidably connected to the outer side of the limit block 11;

[0043] The hollow rod 63 can install and fix the limit block 11, and the limit block 11 is set in the limit groove 12, so that the hollow rod 63 can smoothly limit the connecting rod 62 through the connection between the limit block 11 and the limit groove 12, which can not only increase the stability of the connecting rod 62 when the connecting rod 62 and the hollow rod 63 slide, but also reduce the situation where the connecting rod 62 slips out from the inside of the hollow rod 63.

[0044] The implementation principle of the auxiliary positioning device of a bending machine in the embodiment of the present application is as follows: when in use, the staff can place the metal plate to be folded on the top of the lower mold 4, and place the metal plate on the top of the lower clamping plate 51 when placing it. After the placement is completed, the staff can rotate the one-way screw 55, and the rotation of the one-way screw 55 can limit the upper clamping plate 52 through the first limiting rod 56, thereby driving the upper clamping plate 52 to move to one side of the lower clamping plate 51. After the upper clamping plate 52 moves down to a certain distance, it can smoothly fit with the metal plate placed on the top of the lower clamping plate 51, thereby The lower clamping plates 51 cooperate with each other to clamp the metal plate. After completing the clamping of the metal plate, the staff continues to rotate the bidirectional screw 72. When the bidirectional screw 72 rotates, it can smoothly pass through the opposite direction of the threads on both sides of itself, and the second limiting rod 73 limits the first limiting plate 74 and the second limiting plate 75, thereby driving the first limiting plate 74 and the second limiting plate 75 to move in opposite directions. After the first limiting plate 74 and the second limiting plate 75 move to a certain distance, they can play the role of limiting the metal plate, thereby reducing the possibility of lateral tilting and shaking of the metal plate.

[0045] After that, the staff can start the cylinder 2, and through the operation of the cylinder 2, the upper mold 3 is driven to move downward. After the upper mold 3 moves down to a certain distance, the metal plate can be smoothly bent. At the same time, the metal plate will be tilted and bent due to the bending of the upper mold 3. When the metal plate is tilted, it will drive the lower clamping plate 51 and the upper clamping plate 52 to tilt together. Since the upper clamping plate 52 is rotatably connected to the connecting rod 62 through the rotating rod 61, the connecting rod 62 will slide smoothly inside the hollow rod 63, and because the slide groove 66 is slidably connected to the inside of the slide groove 66, the slide groove 66 can also slide due to the tilting of the metal plate, thereby smoothly reducing the obstruction of the metal when the metal plate is bent and tilted, and increasing the forming rate of the metal plate after being bent.

[0046] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0047] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0048] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A bending machine auxiliary positioning device, characterized in that: It comprises a shell (1); a cylinder (2) is fixedly connected to the upper side of the shell (1); an output shaft of the cylinder (2) passes through the shell (1); an upper mold (3) is fixedly connected to the output shaft of the cylinder (2); and a lower mold (4) is arranged on the inner side of the shell (1); A tilting mechanism (6) is arranged on the inner side of the housing (1), and a clamping mechanism (5) is arranged below the tilting mechanism (6), and the clamping mechanism (5) is used to clamp materials; A limiting mechanism (7) is arranged on the inner side of the shell (1), and the limiting mechanism (7) is arranged below the clamping mechanism (5), and the limiting mechanism (7) is used to limit the material.

2. The auxiliary positioning device for a bending machine according to claim 1, characterized in that: The clamping mechanism (5) comprises a lower clamping plate (51) arranged on the inner side of the shell (1), and mounting plates (53) are fixedly connected on both sides of the lower clamping plate (51), and a first limiting rod (56) is fixedly connected to the top of one of the mounting plates (53), and a one-way screw (55) is rotatably connected to the top of the other mounting plate (53); an upper clamping plate (52) is arranged above the lower clamping plate (51), and connecting plates (54) are fixedly connected on both sides of the upper clamping plate (52), and one of the connecting plates (54) is threadedly connected to the outer side of the one-way screw (55), and the other connecting plate (54) is slidably connected to the outer side of the first limiting rod (56); The tilting mechanism (6) comprises a rotating rod (61) rotatably connected to the top of the mounting plate (53); the outer side of the rotating rod (61) is rotatably connected to a connecting rod (62); the top of the connecting rod (62) is slidably connected to a hollow rod (63), and the hollow rod (63) is slidably connected to the outer side of the connecting rod (62); a slider (65) is provided on the inner side of the shell (1); the shell (1) is slidably connected to a slide groove (66) located inside the slider (65); an arc block (64) is fixedly connected below the slide groove (66); and the hollow rod (63) is rotatably connected to the arc block (64).

3. The auxiliary positioning device for a bending machine according to claim 2, characterized in that: The limiting mechanism (7) comprises a connecting hollow block (71) fixedly connected to the lower side of the upper clamping plate (52), and two connecting hollow blocks (71) are provided, wherein one of the connecting hollow blocks (71) is internally rotatably connected with a bidirectional screw (72), and the other connecting hollow block (71) is internally fixedly connected with a second limiting rod (73), and the outer side of the connecting hollow block (71) is threadedly connected with a first limiting plate (74) and a second limiting plate (75), and the first limiting plate (74) and the second limiting plate (75) are both slidably connected to the outer side of the second limiting rod (73).

4. The auxiliary positioning device for a bending machine according to claim 2, characterized in that: The housing (1) is located inside the sliding block (65) and is fixedly connected to a fixing rod (8), and the sliding groove (66) is slidably connected to the outside of the fixing rod (8).

5. The auxiliary positioning device for a bending machine according to claim 3, characterized in that: A fixing block (10) is fixedly connected to the inner side of the shell (1), and the fixing block (10) is arranged below the lower clamping plate (51). An extension plate (9) is fixedly connected to one side of each of the first limiting plate (74) and the second limiting plate (75).

6. The auxiliary positioning device for a bending machine according to claim 2, characterized in that: The hollow rod (63) is fixedly connected to a limiting block (11) inside, a limiting groove (12) is provided on one side of the connecting rod (62), the limiting block (11) is arranged on the inner side of the limiting groove (12), and the connecting rod (62) is slidably connected to the outer side of the limiting block (11).

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