Rotary positioning mechanism with multi-vehicle-type switching function

Abstract

The utility model discloses a rotary positioning mechanism with a multi-vehicle-type switching function, which comprises a base, a transition rotating block, more than two positioning units, a rotating rod, a clamping rod and a spring, a mounting plate is arranged at the upper end of the base, the transition rotating block is rotatably arranged on the front surface of the mounting plate, the positioning units are respectively arranged on the side surfaces of the transition rotating block, and the clamping rod is arranged on the side surfaces of the transition rotating block. Positioning pins are arranged on the positioning units respectively, the clamping rods are arranged on the mounting plate in a penetrating mode, guide through holes are formed in the transition rotating block, the clamping rods are correspondingly inserted into the guide through holes to lock rotation of the transition rotating block, the rotating rod is arranged in the middle of the transition rotating block in a penetrating mode, and the front end of the rotating rod penetrates out to the front portion of the transition rotating block. The rear end of the rotating rod penetrates out of the rear portion of the mounting plate and is connected with the clamping rod, the rotating rod and the clamping rod can slide front and back together, and the spring provides forward recovery elastic force for the rotating rod. According to the utility model, manual switching can be realized, and switching can also be realized through an external manipulator, so that switching is more flexible.

Description

Technical Field

[0001] The utility model relates to the field of automobile production tooling, in particular to a rotary positioning mechanism with a multi-car model switching function. Background Art

[0002] In the main line and repair welding line of the current automobile factory welding workshop, after the robot's production operation is completed at each workstation of each automatic production line, the body in white is usually transferred to the next workstation by means of a trolley skid. That is, the multiple support and positioning mechanisms on the trolley skid are used to meet the support, positioning and transmission of multiple positioning holes in the body in white chassis.

[0003] For example, the Chinese utility model patent with announcement number CN202148012 U discloses "high-speed automated flexible conveying equipment for automobile body-in-white", which has multiple pairs of flexible clamp units on the flexible trolley conveying equipment. Four sets of clamps are arranged on the flexible clamp units. The four sets of clamps are driven by a pneumatic rotary indexing unit to rotate and replace to adapt to the positioning and support of different body-in-white, and the body-in-white that has completed the production operation is transferred to the next workstation, so that the production line can adapt to various models of body-in-white and achieve the purpose of flexible conveying.

[0004] However, the above-mentioned flexible conveying equipment has the following disadvantages in operation and structure: the rotation switching of its four sets of clamps is completely driven by a pneumatic rotary indexing unit, and when there is no external energy supply and drive device, it cannot be manually switched in manual mode.

[0005] In addition, when multiple robots at the same workstation perform pressurized welding operations on different parts of the body-in-white at the same time, relying solely on the clamps on the pneumatic rotary indexing unit for support and positioning cannot meet the effective dimensional accuracy of the body-in-white on the skid. When the robots are welding the body-in-white, it is easy for the weld point position to deviate, thereby affecting product quality and even creating the risk of collision between the welding gun and the body-in-white. Utility Model Content

[0006] The utility model aims to provide a rotary positioning mechanism with a multi-vehicle switching function, which can be switched manually or by an external manipulator, and the switching is more flexible.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A rotary positioning mechanism with a multi-vehicle switching function is characterized in that it includes a base, a transition rotary block, two or more positioning units, a rotating rod, a clamping rod and a spring. A mounting plate is provided at the upper end of the base. The transition rotary block is rotatably arranged on the front side of the mounting plate. The positioning units are respectively mounted on the side surfaces of the transition rotary block. The positioning units are respectively provided with positioning pins for positioning the body-in-white. The clamping rod is passed through the mounting plate. A guide through hole is provided on the transition rotary block. The rotation of the transition rotary block is locked by correspondingly inserting the clamping rod into the guide through hole. The rotary rod is passed through the middle of the transition rotary block. The front end of the rotary rod passes through the front of the transition rotary block. The rear end of the rotary rod passes through the rear of the mounting plate and is connected to the clamping rod. The rotary rod and the clamping rod can slide forward and backward together. The spring provides elastic force for the rotary rod to recover forward.

[0009] Furthermore, the positioning unit includes a mounting seat, a positioning cylinder and a clamping hook. The positioning cylinder and the positioning pin are respectively fixed on the mounting seat. A limiting boss is provided at the bottom of the positioning pin, and the limiting boss is used to support the body-in-white. A mounting groove is provided on the side of the positioning pin, and the clamping hook is arranged in the mounting groove. The clamping hook is connected to the piston rod of the positioning cylinder, and the clamping hook is driven by the positioning cylinder so that the clamping hook extends out of the mounting groove to clamp part of the body-in-white or retracts into the mounting groove.

[0010] Furthermore, the rotation positioning mechanism includes a sleeve, a rear cover, a bearing and a circular sleeve. The sleeve is fixed in the mounting hole on the mounting plate, the rear cover covers the rear end of the sleeve, the rear end of the circular sleeve is inserted into the sleeve and fixedly connected to the rear cover, the rotating rod is passed through the circular sleeve, the spring is sleeved on the rotating rod, a limit ring is provided on the rotating rod, the spring is limited between the limit ring and the rear cover, the transition rotating block is sleeved on the circular sleeve through the sleeve hole in the middle of its rear end, and is rotatably connected to the circular sleeve through the bearing.

[0011] Furthermore, a rear end middle hole is provided in the middle of the rear cover, a front end middle hole is provided at the front end of the sleeve hole of the transition rotating block, the rear end of the rotating rod passes through the rear end middle hole, and the front end of the rotating rod passes through the front end middle hole.

[0012] Furthermore, the rotation positioning mechanism includes a connecting plate, which is located behind the mounting plate, and the rear end of the rotating rod and the rear end of the clamping rod are fixedly connected to the connecting plate.

[0013] Furthermore, the rotation positioning mechanism includes two clamping rods, a pair of corners of the mounting plate are respectively provided with through holes, the clamping rods are respectively passed through the through holes, and the four corners of the transition rotating block are respectively provided with guide through holes.

[0014] Furthermore, a front end of the clamping rod is provided with an arc surface, and a guide ring is provided in the guide through hole.

[0015] Furthermore, the positioning unit includes a bracket, which includes a connecting bracket, an L-shaped bracket and a T-shaped bracket. One end of the connecting bracket is fixed to the side of the transition rotating block, one side of the L-shaped bracket is fixedly connected to the other end of the connecting bracket, and the T-shaped bracket is fixed to the other side of the L-shaped bracket.

[0016] Furthermore, the bracket also includes an X-direction gasket, a Y-direction gasket and a Z-direction gasket, the Z-direction gasket is padded between the connecting bracket and the side of the transition rotating block, the X-direction gasket is padded between the L-shaped bracket and the connecting bracket, and the Y-direction gasket is padded between the L-shaped bracket and the T-shaped bracket.

[0017] Furthermore, a barb is provided at the upper end of the clamping hook, a pin is provided in the mounting groove of the positioning pin, a long hole is provided in the middle of the clamping hook, the pin passes through the long hole, the lower end of the long hole is bent toward the side where the barb is located, and the lower end of the clamping hook is connected to the piston rod of the positioning cylinder.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. When the positioning unit needs to be switched, the utility model can press the rotating rod in manually or by an external manipulator, and the rotating rod drives the clamping rod to disengage from the guide through hole, so that the transition rotating block can be rotated to switch different positioning units. It can be seen that the switching is more flexible and no longer needs to rely entirely on external power supply. In the event of a problem with the external power, it can also be switched manually.

[0020] 2. The utility model further designs a limiting boss to support the body-in-white, and designs a clamping hook to clamp part of the body-in-white, so as to better position and fix the body-in-white, ensuring that the body-in-white will not deviate during the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the three-dimensional schematic diagrams of the rotary positioning mechanism of the embodiment of the utility model;

[0022] Figure 2 This is the second three-dimensional schematic diagram of the rotation positioning mechanism of the embodiment of the utility model;

[0023] Figure 3 This is one of the partial structural schematic diagrams of the rotary positioning mechanism of the embodiment of the utility model;

[0024] Figure 4 This is the second partial structural diagram of the rotation positioning mechanism of the embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of the structure of the base and the mounting plate of the rotary positioning mechanism of the embodiment of the utility model;

[0026] Figure 6 This is the third partial structural diagram of the rotation positioning mechanism of the embodiment of the utility model;

[0027] Figure 7 It is a structural schematic diagram of a transition rotating block of a rotating positioning mechanism of an embodiment of the utility model;

[0028] Figure 8 It is a cross-sectional schematic diagram of the transition rotating block of an embodiment of the utility model;

[0029] Fig. 9 It is a cross-sectional schematic diagram of the clamping rod of an embodiment of the utility model;

[0030] Fig.10 This is a schematic structural diagram of the positioning pin of an embodiment of the utility model;

[0031] Fig.11 It is a cross-sectional schematic diagram of the positioning pin of an embodiment of the utility model.

[0032] Meaning of reference numerals in the figure:

[0033] 1-base; 1.1-bottom plate; 1.2-trapezoidal connecting plate; 1.3-column; 2-transition rotating block; 2.1-guide through hole; 2.2-sleeve hole; 2.3-front end middle hole; 3-bracket; 3.1-connecting bracket; 3.2-L-shaped bracket; 3.3-T-shaped bracket; 3.4-Z direction gasket; 3.5-X direction gasket; 3.6-Y direction gasket; 4-positioning cylinder; 4.1-piston rod; 5-mounting seat; 6-positioning pin; 6.1- Limiting boss; 6.2-installing groove; 7-rotating rod; 7.1-limiting ring; 8-clamping hook; 8.1-barb; 8.2-long hole; 9-installing plate; 9.1-perforation; 10-connecting plate; 10.1-accommodating groove; 11-sleeve; 12-clamping rod; 13-bearing; 14-spring; 15-snapping ring; 16-rear cover; 16.1-rear end middle hole; 17-circular sleeve; 18-guide ring; 19-sensor bracket; 20-pin shaft. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with embodiments.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Example:

[0039] like Figures 1 to 11 The figure shows a rotary positioning mechanism with a multi-vehicle switching function of this embodiment, which includes a base 1, a transition rotating block 2, four positioning units, a rotating rod 7, a clamping rod 12, a spring 14, a sleeve 11, a rear cover 16, a bearing 13, a circular sleeve 17 and a connecting plate 10.

[0040] The base 1 of this embodiment includes a bottom plate 1.1, two trapezoidal connecting plates 1.2 and a column 1.3, the two trapezoidal connecting plates 1.2 are relatively fixed on the top of the bottom plate 1.1, the column 1.3 is fixed between the two trapezoidal connecting plates 1.2, and a mounting plate 9 is provided at the upper end of the column 1.3. The transition rotating block 2 is a square block, and the transition rotating block 2 is rotatably arranged on the front of the mounting plate 9.

[0041] The specific structure of the transition rotating block 2 rotatably arranged on the front side of the mounting plate 9 is as follows: Figure 8 As shown, a mounting hole is provided on the mounting plate 9, a sleeve 11 is fixed in the mounting hole, a rear cover 16 covers the rear end of the sleeve 11, a rear end of the circular sleeve 17 is inserted into the sleeve 11, and is fixedly connected to the rear cover 16 by bolts, a sleeve hole 2.2 is provided in the middle of the rear end of the transition rotating block 2, the transition rotating block 2 is sleeved on the circular sleeve 17 through its sleeve hole 2.2, and is rotatably connected to the circular sleeve 17 through the bearing 13, a snap ring 15 is provided at the rear end cover of the sleeve hole 2.2, and the snap ring 15 is fixed to the rear end surface of the transition rotating block 2 by bolts.

[0042] like Figures 4 to 6As shown, in this embodiment, guide holes 2.1 are respectively provided at the four corners of the transition rotating block 2, and through holes 9.1 are respectively provided at a pair of corners of the mounting plate 9. A clamping rod 12 is respectively inserted in the two through holes 9.1. The clamping rod 12 is cylindrical, and the front end of the clamping rod 12 is provided with an arc surface, and the rear end of the guide through hole 2.1 is provided with a guide ring 18. When the clamping rod 12 extends forward to the front of the through hole 9.1, it can be correspondingly inserted into the guide through hole 2.1, thereby locking the rotation of the transition rotating block 2. When the clamping rod 12 moves backward and exits from the guide through hole 2.1, the transition rotating block 2 can rotate freely.

[0043] The rotating rod 7 is inserted into the circular sleeve 17, the spring 14 is sleeved on the rotating rod 7, a stop ring 7.1 is provided on the rotating rod 7, and the spring 14 is limited between the stop ring 7.1 and the rear cover 16, so that the spring 14 provides elastic force for the rotating rod 7 to recover forward. A rear end middle hole 16.1 is provided in the middle of the rear cover 16, and a front end middle hole 2.3 is provided at the front end of the sleeve hole of the transition rotating block 2. The rear end of the rotating rod 7 passes through the rear end middle hole 16.1, and the front end of the rotating rod 7 passes through the front end middle hole 2.3, and passes out to the front of the transition rotating block 2.

[0044] The connecting plate 10 is a square plate, located behind the mounting plate 9. The rear ends of the rotating rod 7 and the clamping rod 12 are fixedly connected to the connecting plate 10 by bolts, so that the rotating rod 7 and the clamping rod 12 are connected together, and the rotating rod 7 and the clamping rod 12 can slide forward and backward together. In this embodiment, a receiving groove 10.1 is provided on the front of the connecting plate 10, and the receiving groove 10.1 can receive the rear cover 16 so that they do not affect each other.

[0045] The positioning units are respectively installed on four side surfaces of the transition rotating block 2 , and the positioning units include a bracket 3 , a positioning pin 6 , a mounting seat 5 , a positioning cylinder 4 and a clamping hook 8 .

[0046] The bracket 3 includes a connecting bracket 3.1, an L-shaped bracket 3.2, a T-shaped bracket 3.3, an X-direction gasket 3.5, a Y-direction gasket 3.6 and a Z-direction gasket 3.4. One end of the connecting bracket 3.1 is fixed to the side of the transition rotating block 2 by bolts, one side of the L-shaped bracket 3.2 is fixedly connected to the other end of the connecting bracket 3.1 by bolts, the T-shaped bracket 3.3 is fixed to the other side of the L-shaped bracket 3.2 by bolts, and the mounting seat 5 is fixed to the T-shaped bracket 3.3 by bolts. The Z-direction gasket 3.4 is padded between the connecting bracket 3.1 and the side of the transition rotating block 2, the X-direction gasket 3.5 is padded between the L-shaped bracket 3.2 and the connecting bracket 3.1, and the Y-direction gasket 3.6 is padded between the L-shaped bracket 3.2 and the T-shaped bracket 3.3. During use, by adjusting the thickness of the X-direction gasket 3.5, the Y-direction gasket 3.6 and the Z-direction gasket 3.4, the X, Y and Z directions can be adjusted to meet the adjustment of the orientation of different vehicle models.

[0047] like Fig.10 and Fig.11 As shown, the positioning cylinder 4 and the positioning pin 6 are respectively fixed on the two end faces of the mounting seat 5. The mounting seat 5 has a through hole in the middle, and the piston rod 4.1 of the positioning cylinder 4 passes through the through hole. The bottom of the positioning pin 6 is provided with a limiting boss 6.1, which is used to support the body in white. The side of the positioning pin 6 is provided with a mounting groove 6.2, and the inner end of the mounting groove 6.2 is connected to the through hole in the middle of the mounting seat 5.

[0048] The clamping hook 8 is arranged in the installation groove 6.2, and the clamping hook 8 is connected to the piston rod 4.1 of the positioning cylinder 4, and the clamping hook 8 is driven by the positioning cylinder 4. The specific structure is: a barb 8.1 is provided at the upper end of the clamping hook 8, and the barb 8.1 is located on the side of the positioning pin 6. A pin shaft 20 is provided in the installation groove 6.2 of the positioning pin 6. A long hole 8.2 is provided in the middle of the clamping hook 8, and the pin shaft 20 passes through the long hole 8.2. The lower end of the long hole 8.2 is bent toward the side where the barb 8.1 is located, and the lower end of the clamping hook 8 is connected to the piston rod 4.1 of the positioning cylinder 4. When the piston rod 4.1 of the positioning cylinder 4 extends upward, it will drive the clamping hook 8 to move upward until the pin shaft 20 is located at the lower end of the long hole 8.2. At this time, it will be as shown in FIG. Fig.10 As shown, the barb 8.1 of the clamping hook 8 will retract into the mounting groove 6.2, and will not hinder the insertion of the positioning hole on the white body; when the positioning hole of the white body is sleeved on the positioning pin 6 and supported on the limiting boss 6.1, the piston rod 4.1 of the positioning cylinder 4 will retract downward, driving the clamping hook 8 to move downward, so that the barb 8.1 of the clamping hook 8 extends out of the mounting groove 6.2 and clamps part of the white body.

[0049] The use of the rotation positioning mechanism of this embodiment is as follows:

[0050] The rotary positioning mechanism of this embodiment will be installed on the flexible trolley conveying equipment when in use, and the white body will be positioned and supported by the rotary positioning mechanism. When different types of white bodies need to be transported, the positioning unit needs to be switched. When switching, the rotating rod 7 is pressed in manually or by an external manipulator, and the rotating rod 7 will drive the clamping rod 12 to move backward together, and finally the clamping rod 12 will be separated from the guide through hole 2.1. At this time, the transition rotating block 2 can be rotated. For the external manipulator, a switching pin corresponding to the front end of the guide through hole 2.1 can also be set, so as to better rotate the transition rotating block 2. By rotating the transition rotating block 2, different positioning units can be switched. When the switching is completed, the rotating rod 7 is released, and the rotating rod 7 will recover forward under the action of the spring 14. At the same time, the rotating rod 7 will drive the clamping rod 12 to move forward, and the clamping rod 12 is inserted into the rear end of the corresponding guide through hole 2.1 to re-lock the rotation of the transition rotating block 2.

[0051] After the switch is completed, the BIW can be put back into the transportation. Initially, the clamping hook 8 is retracted into the installation slot 6.2. At this time, the BIW is placed on the flexible trolley conveying device. The positioning hole on the BIW will be sleeved on the positioning pin 6 and supported on the limiting boss 6.1. Then the positioning cylinder 4 is started, and the piston rod 4.1 of the positioning cylinder 4 is retracted downward, driving the clamping hook 8 to move downward, so that the barb 8.1 of the clamping hook 8 extends out of the installation slot 6.2 and clamps part of the BIW, thereby completing the positioning and fixing of the BIW.

[0052] In this embodiment, four positioning units are provided, so that the transportation of the body-in-white of four models can be satisfied.

[0053] In this embodiment, a sensor bracket 19 is further provided on the bracket of each positioning unit for installing the sensor.

[0054] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. A rotary positioning mechanism with multi-vehicle switching function, characterized in that: It includes a base, a transition rotating block, more than two positioning units, a rotating rod, a clamping rod and a spring, a mounting plate is provided at the upper end of the base, the transition rotating block is rotatably arranged on the front side of the mounting plate, the positioning units are respectively installed on the side surfaces of the transition rotating block, the positioning units are respectively provided with positioning pins for positioning the body in white, the clamping rod is passed through the mounting plate, the transition rotating block is provided with a guide through hole, the rotation of the transition rotating block is locked by inserting the clamping rod into the guide through hole, the rotating rod is passed through the middle of the transition rotating block, the front end of the rotating rod passes through the front of the transition rotating block, the rear end of the rotating rod passes through the rear of the mounting plate and is connected to the clamping rod, the rotating rod and the clamping rod can slide forward and backward together, and the spring provides the rotating rod with elastic force to restore forward.

2. The rotary positioning mechanism with multi-vehicle switching function according to claim 1, characterized in that: The positioning unit includes a mounting seat, a positioning cylinder and a clamping hook, the positioning cylinder and the positioning pin are respectively fixed on the mounting seat, a limiting boss is provided at the bottom of the positioning pin, the limiting boss is used to support the body-in-white, a mounting groove is provided on the side of the positioning pin, and the clamping hook is arranged in the mounting groove; the clamping hook is connected to the piston rod of the positioning cylinder, and the clamping hook is driven by the positioning cylinder so that the clamping hook extends out of the mounting groove to clamp part of the body-in-white or retracts into the mounting groove.

3. The rotary positioning mechanism with multi-vehicle switching function according to claim 1, characterized in that: The rotation positioning mechanism includes a sleeve, a rear cover, a bearing and a circular sleeve. The sleeve is fixed in the mounting hole on the mounting plate, the rear cover covers the rear end of the sleeve, the rear end of the circular sleeve is inserted into the sleeve and fixedly connected to the rear cover, the rotating rod is passed through the circular sleeve, the spring is sleeved on the rotating rod, a limiting ring is provided on the rotating rod, the spring is limited between the limiting ring and the rear cover, the transition rotating block is sleeved on the circular sleeve through the sleeve hole in the middle of its rear end, and is rotatably connected to the circular sleeve through the bearing.

4. The rotary positioning mechanism with multi-vehicle switching function according to claim 3 is characterized in that: A rear end middle hole is provided in the middle of the rear cover, a front end middle hole is provided at the front end of the sleeve hole of the transition rotating block, the rear end of the rotating rod passes through the rear end middle hole, and the front end of the rotating rod passes through the front end middle hole.

5. The rotary positioning mechanism with multi-vehicle switching function according to claim 4, characterized in that: The rotation positioning mechanism comprises a connecting plate, the connecting plate is located behind the mounting plate, and the rear end of the rotating rod and the rear end of the clamping rod are both fixedly connected to the connecting plate.

6. The rotary positioning mechanism with multi-vehicle switching function according to claim 1, characterized in that: The rotation positioning mechanism comprises two clamping rods, a pair of corners of the mounting plate are respectively provided with through holes, the clamping rods are respectively passed through the through holes, and the four corners of the transition rotating block are respectively provided with guide through holes.

7. The rotary positioning mechanism with multi-vehicle switching function according to claim 6, characterized in that: The front end of the clamping rod is provided with an arc surface, and the guide through hole is provided with a guide ring.

8. The rotary positioning mechanism with multi-vehicle switching function according to claim 2, characterized in that: The positioning unit includes a bracket, which includes a connecting bracket, an L-shaped bracket and a T-shaped bracket. One end of the connecting bracket is fixed to the side of the transition rotating block, one side of the L-shaped bracket is fixedly connected to the other end of the connecting bracket, and the T-shaped bracket is fixed to the other side of the L-shaped bracket.

9. The rotary positioning mechanism with multi-vehicle switching function according to claim 8, characterized in that: The bracket also includes an X-direction gasket, a Y-direction gasket and a Z-direction gasket, wherein the Z-direction gasket is padded between the connecting bracket and the side surface of the transition rotating block, the X-direction gasket is padded between the L-shaped bracket and the connecting bracket, and the Y-direction gasket is padded between the L-shaped bracket and the T-shaped bracket.

10. The rotary positioning mechanism with multi-vehicle switching function according to claim 2, characterized in that: A barb is provided at the upper end of the clamping hook, a pin is provided in the mounting groove of the positioning pin, a long hole is provided in the middle of the clamping hook, the pin passes through the long hole, the lower end of the long hole is bent toward the side where the barb is located, and the lower end of the clamping hook is connected to the piston rod of the positioning cylinder.

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