Connector suitable for fluid transmission

Abstract

The utility model discloses a connector suitable for fluid transmission, which is characterized in that the front end part of a valve body is a locking surface, the valve body is of a front-back through hole structure, a cavity structure for accommodating a ball valve is formed in the middle of the valve body, and the central axis of the through hole of the ball valve coincides with the central axis of the through hole of the valve body; a rotary switch is arranged on the upper portion of the ball valve and controls the deflection state of the ball valve. The rotary switch is controlled to rotate and move and is matched and fixed with the other group of joint matched with the rotary switch; the front end portion where the positioning pin is located penetrates through the locking face and extends outwards, a positioning assembly is arranged at the rear end portion, and the positioning assembly limits the position of the positioning pin in the length direction. By means of the rotary switch, the deflection direction of the ball valve can be adjusted, meanwhile, fluid circulation of the valve body can be adjusted, locking of the locking pin and the positioning pin is synchronously achieved, the operation mode is synchronously achieved through the rotary switch, and operation is more convenient and faster.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid pipeline connectors, and particularly relates to a connector suitable for fluid transmission. Background Art

[0002] A fluid connector is a device used to connect pipelines for transporting high-pressure production fluids so that relative movement can occur between two components at the corresponding connection ends of the pipeline. Usually, such a component is formed by multiple connection structures. During actual use, through the connection of multiple connectors, the locking of the component is achieved, as well as the on-off control of fluid transmission in the pipeline. Of course, according to the actual substances to be transmitted, the internal structure and other auxiliary components vary.

[0003] In Chinese Patent Application Publication No. CN 113167425A, a fluid connector is disclosed, which includes a first connection body, a second connection body, and a locking body designed to connect the first connection body to the second connection body. The locking body has a first locking device that cannot be released in a non-destructive manner and a second locking device that can be released in a non-destructive manner, and the locking body is designed to be pressed on the radially outer part of the first connection body and the radially outer part of the second connection body. In such a structural member, only the self-locking structure of the engaging members on the outer peripheries of the two connectors is adopted to achieve locking. Once the fluid transmission pressure is too high or the large-flow transmission occurs, the locking member will fall off or there will be a gap between the two components, and the problem of poor sealing will be magnified. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a connector suitable for fluid transmission, which solves the above-mentioned technical problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A connector suitable for fluid transmission includes a valve body, a ball valve, a rotary switch, a locking pin, and a positioning pin.

[0007] The front end of the valve body is a locking surface, and the valve body is a through-hole structure that penetrates from front to back, forming a cavity structure for accommodating the ball valve in the middle. The ball valve forms a through-hole structure that penetrates from front to back in the middle, so that the central axis of the through-hole of the ball valve coincides with the central axis of the through-hole of the valve body.

[0008] A rotary switch is arranged on the upper part of the ball valve, and the deflection state of the ball valve is controlled by the rotary switch, so as to control the flow rate of the fluid passing through the valve body.

[0009] The front end portion of the locking pin penetrates the locking surface, and the rear end portion is implanted into the valve body along the axis direction of the outer wall of the valve body, and by controlling the rotational movement of the rotary switch, the locking pin is synchronously driven to extend out of the end surface of the locking surface and to be fixed with another set of joints matched therewith;

[0010] The front end portion of the locating pin passes through the locking surface and extends outward, and the rear end portion is implanted into the valve body along the axis direction of the outer wall where the valve body is located. A locating component is provided at the rear end portion, and the position of the locating pin in the length direction is limited by the locating component.

[0011] Furthermore, the rear end portion where the valve body is located is configured as a tower tail portion, and is connected to the hose via the tower tail portion.

[0012] Furthermore, the locking surface is fixed to the front end surface of the valve body by bolt connection, and the front end portion is provided with a hook for engagement and protruding to the outer side surface, and the hook is used to achieve coordination and fixation with another set of structures.

[0013] Furthermore, the rotary switch includes a rotary handle and a connecting bolt, wherein the connecting bolt passes through the upper wall where the valve body is located, and the upper part where the connecting bolt is located is fixed to the rotary handle, and the lower part where the connecting bolt is located is fixed to the upper part of the ball valve;

[0014] The rotation of the handle drives the connecting bolt to rotate synchronously, thereby controlling the deflection angle of the ball valve connected to the connecting bolt.

[0015] Furthermore, a limit pin is provided at the lower part where the ball valve is located, and is connected to the inner edge of the lower wall where the valve body is located through the limit pin;

[0016] At the same time, the ball valve is made to rotate about the central axis where the limit pin and the connecting bolts on the upper part of the ball valve are located.

[0017] Furthermore, a through hole is provided in the middle portion where the limit pin is located, and is communicated with the middle through hole where the ball valve is located.

[0018] Furthermore, a guide pin is disposed transversely on the rotating handle, the front end of the guide pin protrudes outward, and the rear end is fixedly connected by a return spring, a first clearance is formed in the middle of the guide pin, and a limiting ball is disposed below the guide pin;

[0019] When the guide pin is in a non-pressurized state, under the action of the return spring, the non-central position of the guide pin contacts the limiting ball and generates downward pressure on the limiting ball, thereby limiting the deflection of the rotating handle;

[0020] When the front end of the guiding pin is under pressure, a first relief gap is formed to provide space for the lifting of the limiting ball, enabling the rotary handle to deflect around the rotation center where the connecting bolt is located.

[0021] Further, below the limiting ball of the rotary handle, sunken limiting grooves are provided at both ends in the rotation direction, and the limiting ball is placed in the limiting groove after deflection to achieve load limiting.

[0022] Further, spiral teeth are provided along the axial direction at the rear end of the locking pin, and the spiral teeth are engaged with the tooth disc provided on the rotary handle. By rotating the rotary handle, the spiral teeth engaged with the tooth disc are driven to rotate, forming an outward driving force on the locking pin.

[0023] Further, the front end of the positioning pin protrudes outward from the locking surface, and the rear end is fixedly connected by a return spring. A third relief gap is formed in the middle of the positioning pin.

[0024] A second relief gap is formed in the middle of the locking pin, and a connection channel is formed between the cavities connected by the locking pin and the positioning pin. A positioning ball is filled in the connection channel.

[0025] When the locking pin is pushed forward, the second relief gap where it is located is pushed forward synchronously to squeeze the positioning ball, so that the positioning ball enters the third relief gap area of the positioning pin along the connection channel, and the connection channel as a whole forms a limit on the positioning pin in the length direction.

[0026] Further, the length of the connection channel where the locking pin and the positioning pin are located is less than the diameter length of the positioning ball.

[0027] Advantages of the present utility model:

[0028] 1. The rotary switch adopted by the present device can adjust the deflection direction of the ball valve, that is, it can adjust the on-off of the fluid flow through the valve body, and simultaneously lock the locking pin and the positioning pin. This operation method is achieved synchronously by the rotary switch, making the operation more convenient.

[0029] 2. The guiding pin is provided on the rotary handle adopted by the present device, which can lock the relative position of the rotary handle under the action of rotating the rotary handle, preventing the phenomenon of accidental touch during actual operation.

[0030] 3. The present device uses a connection channel to connect the locking pin and the positioning pin, and a positioning ball is filled in the connection channel. By changing the relative positions of the locking pin and the positioning pin, the relative position of the positioning ball is moved, that is, the relative positions of the locking pin and the positioning pin are fixed. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0032] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0033] Figure 2 is the structural schematic diagram of the valve body of the embodiment of the present invention;

[0034] Figure 3 is the structural schematic diagram of the locking surface of the embodiment of the present invention;

[0035] Figure 4 is the structural schematic diagram of the ball valve of the embodiment of the present invention;

[0036] Figure 5 is the Figure 1 cross-sectional structural schematic diagram of the embodiment of the present invention;

[0037] Figure 6 is the Figure 5 partial structural schematic diagram at position A in the embodiment of the present invention;

[0038] Figure 7 is the structural schematic diagram of the rotary handle of the embodiment of the present invention;

[0039] Figure 8 is the overall structural schematic diagram of the position where the guide pin is located in the embodiment of the present invention;

[0040] Figure 9 is the cross-sectional structural schematic diagram of the position where the locking pin is located in the embodiment of the present invention;

[0041] Figure 10 is the structural schematic diagram of the meshing state of the locking pin and the gear disk in the embodiment of the present invention;

[0042] Figure 11 is the cross-sectional structural schematic diagram of the connecting channel position where the locking pin and the positioning pin are located in the embodiment of the present invention;

[0043] Figure 12 is the cross-sectional structural schematic diagram of the position where the positioning pin is located in the embodiment of the present invention;

[0044] Figure 13 is the structural schematic diagram of the locking state of the locking pin and the positioning pin in the embodiment of the present invention;

[0045] Figure 14 is the overall structural schematic diagram of the locking pin in the embodiment of the present invention;

[0046] Figure 15 It is a schematic diagram of the overall structure of the positioning pin in an embodiment of the present utility model. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0048] As Figure 1 、 Figure 2 shown, an embodiment of the present utility model provides a joint applicable to fluid transmission, including a valve body 1, a ball valve 2, a rotary switch 3, a locking pin 4, and a positioning pin 5.

[0049] As Figure 3 shown, the front end of the valve body 1 is a locking surface 11. The locking surface 11 is fixed to the front end surface of the valve body 1 by a bolt connection method, which is convenient for replacement and disassembly in actual application scenarios, meets the connection requirements of different pipelines, and a hook 111 that is used for engagement and protrudes outward is provided at the front end of the locking surface 11. The hook 111 is used to cooperate and fix with another set of structures (for different design requirements, there are requirements for the size and number of the hooks 111. Therefore, in actual use scenarios, they are all within the protection scope of this application).

[0050] The rear end of the valve body 1 is set as a tower-shaped tail 12, which is connected to a hose through the tower-shaped tail 12. Multiple annular protrusions are provided on the outer periphery of the tower-shaped tail 12, which can achieve the firm connection between hoses when connected to the hose.

[0051] The valve body 1 is a through-hole structure that penetrates from front to back. As Figure 4 shown, a cavity structure for accommodating the ball valve 2 is formed in the middle. The ball valve 2 has a through-hole structure that penetrates from front to back, so that the central axis of the through-hole of the ball valve 2 coincides with the central axis of the through-hole of the valve body 1. In order to improve the stability of the ball valve 2 during deflection, the inner diameter of the opening of the ball valve 2 is kept the same as the inner diameter of the through-hole of the valve body 1, and the positions where both sides of the ball valve 2 contact the inner wall of the valve body 1 are sealed with gaskets to reduce the frictional loss between the outer periphery of the ball valve 2 and the inner wall of the valve body 1.

[0052] As Figure 5 shown, a rotary switch 3 is provided on the upper part of the ball valve 2. The rotary switch 3 includes a rotary handle 31 and a connecting bolt 32. The connecting bolt 32 penetrates the upper wall of the valve body 1, and the upper part of the connecting bolt 32 is fixed to the rotary handle 31, and the lower part of the connecting bolt 32 is fixed to the upper part of the ball valve 2; AsFigure 6 As shown, a limit pin 201 is provided at the lower part where the ball valve 2 is located, and the limit pin 201 is connected to the inner edge of the lower wall where the valve body 1 is located, that is, at this time, the limit pin 201, the connecting bolt 32 and the center of the ball valve 2 are on the same axis in the vertical direction, and the rotating handle 31 can be rotated to drive the rotation of the connecting bolt 32, so that the ball valve 2 always moves in the direction of the central axis;

[0053] In addition, a through hole is provided downwardly in the middle part where the limit pin 201 is located, and the through hole is connected to the middle through hole where the ball valve 2 is located. Therefore, when fluid flows in the ball valve 2, the through hole position where the traditional ball valve 2 is located has a large pressure when the fluid flows, while the position below the ball valve 2 is hollow and in a small pressure state (that is, at this time, a pressure difference will be generated between the middle part where the ball valve 2 is located and the bottom part where the ball valve is located, which will increase the operating torque when twisting the ball valve 2 at this time). In the present application, since the position below the limit pin 201 is connected to the through hole position where the ball valve 2 is located through the through hole, the fluid at this time will enter the position below the ball valve 2, thereby maintaining the same pressure on the inner wall and the bottom of the through hole where the ball valve is located, thereby reducing the operating torque when twisting the ball valve 2.

[0054] The deflection state of the ball valve 2 is controlled by the rotary switch 3, thereby controlling the deflection angle of the ball valve 2 connected to the connecting bolt 32. When the through hole where the ball valve 2 is located is on the same axis as the axis where the through hole of the valve body 1 is located, the controlled flow rate is maximum. When the ball valve 2 is controlled to be offset, the cross-sectional area will be smaller, so the controlled flow rate will be reduced. When the rotary switch 3 is deflected to the maximum, the ball valve 2 can be controlled to completely block and close the valve body 1.

[0055] like Figure 7 , Figure 8 As shown, similarly, in order to avoid the guide pin 311 being arranged horizontally on the rotating handle 31 during transportation, the front end of the guide pin 311 protrudes outward, and the rear end is fixedly connected by a reset spring, so that the guide pin 311 has a certain reset effect in the horizontal direction, and a first clearance gap 301 is formed in the middle part where the guide pin 311 is located, and a limiting ball 302 is arranged below the guide pin 311, and the limiting ball 302 is movably arranged in the vertical direction.

[0056] When the guide pin 311 is in a non-pressurized state, under the action of the return spring, the non-central position of the guide pin 311 contacts the limiting ball 302. At this time, the guide pin 311 generates downward pressure on the limiting ball 302, thereby limiting the deflection movement of the rotating handle 31 (i.e., limiting the arbitrary deflection of the rotating handle 31), which plays a protective role.

[0057] When the front end of the guide pin 311 is under pressure, a pressing method can be used, so that the guide pin 311 squeezes the return spring, so that the first clearance gap 301 makes room for the lifting of the limiting ball 302. Therefore, when the rotating handle 31 is swung, the limiting ball 302 can be lifted and placed in the area where the first clearance gap 301 is located, thereby facilitating the rotation of the rotating handle 31. Subsequently, the rotating handle 31 deflects around the rotation center where the connecting bolt 32 is located.

[0058] The limiting ball 302 is located below the rotating handle 31, and sunken limiting grooves 303 are provided at both ends in the rotating direction, so that the limiting ball 302 is placed in the limiting groove 303 for load limiting after the deflection is completed. Therefore, before swinging the rotating handle 31, it is possible to carry the limiting ball 302 before and after the deflection of the rotating handle 31. At this time, the middle part of the limiting groove 303 is presenting a downwardly concave structure, and its peripheral height is relatively high, so it is possible to carry the limiting ball 302 and limit its movement in the horizontal direction. At this time, the upper position of the limiting ball 302 is embedded below the rotating handle 31 (that is, the height of the bottom of the rotating handle 31 from the limiting groove 303 is less than the diameter of the limiting ball 302 itself), that is, it is simultaneously realized to limit its selection in the horizontal direction to avoid accidental touch, and also realizes the relative locking of the position of the rotating handle 31 after the rotation is completed.

[0059] like Figure 9 , Figure 10 As shown, the front end portion of the locking pin 4 penetrates the locking surface 11, and the rear end portion is implanted into the valve body 1 along the axial direction of the outer wall of the valve body 1, and by controlling the rotational movement of the rotary switch 3, the locking pin 4 is synchronously driven to extend out of the end surface of the locking surface 11, and another set of joints matched with it are matched and fixed; a second clearance gap 401 is formed in the middle part where the locking pin 4 is located, and a helical tooth 402 is provided at the rear end portion where the locking pin 4 is located along the axial direction; as shown Figure 14 shown.

[0060] When in use, the rotation of the rotating handle 31 realizes the rotation of the ball valve 2, thereby controlling the flow control through the valve body 1. At the same time, when the rotating handle 31 rotates, the toothed disc 312 set thereon is synchronously rotated (the toothed disc 312 can also be directly integrated with the rotating handle 31). At the beginning, the spiral teeth 402 are meshed with the toothed disc 312 set on the rotating handle 31. The rotation of the rotating handle 31 drives the spiral teeth 402 meshed with the toothed disc 312 to rotate and form an outward driving force for the locking pin 4, controlling the front end of the locking pin 4 located at the locking surface 11 to extend (to form a lock with another group of valve body parts). At this time, the toothed disc 312 and the rotating handle 31 form a whole. When the rotating handle 31 is driven, the deflection flow of the ball valve 2 is controlled, and the driving operation of the locking pin 4 can also be controlled. One structure can realize two functional operations.

[0061] The front end portion of the positioning pin 5 passes through the locking surface 11 and extends outward (at this time, the locking pin 4 and the positioning pin 5 are arranged in parallel, and the cavities accommodated therein are connected through the connecting channel 101, such as Figure 11 As shown), the rear end is implanted into the valve body 1 along the axial direction of the outer wall where the valve body 1 is located, and a positioning component is provided at the rear end to limit the position of the positioning pin 5 in the length direction through the positioning component.

[0062] like Figure 12 , Figure 13 As shown, the front end of the positioning pin 5 protrudes outward from the locking surface 11, and the rear end is fixedly connected by a return spring, and a third clearance gap 501 is formed in the middle of the positioning pin 5 (as shown in FIG. Figure 15 As shown); the connecting channel 101 is filled with positioning balls 102 (the length of the connecting channel 101 is less than the diameter of the positioning balls 102); at the beginning, the second clearance gap 401 where the locking pin 4 is located and the connecting channel 101 form a space for accommodating the positioning balls 102, and at this time, the positioning pin 5 is pushed forward as a whole by the return spring at the rear end, and even if the positioning pin 5 is pressed down, it will pop out toward the protruding surface of the locking surface 11 under the action of the return spring at the rear end (the length of the connecting channel 101 where the locking pin 4 and the positioning pin 5 are located is less than the diameter of the positioning balls 102, and at this time the positioning balls 102 can move in the connecting channel 101, and will not form a blocking limit in the extension direction of the positioning pin 5).

[0063] Subsequently, under the rotation of the toothed disc 312, the locking pin 4 can be pushed forward, and the positioning ball 102 located in the second relief gap 401 is squeezed, gradually moving towards the position where the connecting channel 101 is located and the third relief gap 501 area of the positioning pin 5, thereby forming a limit on the movement of the positioning pin 5 in the extending direction. At this time, the purpose of the positioning pin 5 is to form a limit in the re-rotation direction after being inserted into the position of another set of joints (not disclosed in the specific figure). And the locking pin 4 that protrudes forward can form an interlocking engagement after being inserted into the position of another set of joints (since the rotary handle 31 used to drive the locking pin 4 is in a locked state at this time, specifically referring to the working principle of the guide pin 311 above, so once the rotary handle 31 is locked, the relative positions of the locking pin 4 and the positioning pin 5 are fixed and can be formed in both the extending direction of the through hole of the valve body 1 and the rotation direction of the end face).

[0064] In the actual use of the entire device, through the rotation operation of the rotary handle 31, the valve body 1 can be connected and locked with another set of valve bodies. The structure is reasonably designed, easy to operate, and has stronger firmness.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A connector suitable for fluid transmission, comprising a valve body (1), a ball valve (2), a rotary switch (3), a locking pin (4), and a positioning pin (5), characterized in that: The front end portion of the valve body (1) is a locking surface (11), and the valve body (1) is a through-hole structure extending from front to back, with a cavity structure for accommodating the ball valve (2) formed in the middle, and a through-hole structure extending from front to back is formed in the middle portion where the ball valve (2) is located, so that the central axis of the through-hole of the ball valve (2) coincides with the central axis of the through-hole of the valve body (1); A rotary switch (3) is provided on the upper part of the ball valve (2), and the deflection state of the ball valve (2) is controlled by the rotary switch (3), thereby controlling the flow rate of the fluid passing through the valve body (1); The front end portion of the locking pin (4) penetrates the locking surface (11), and the rear end portion is implanted into the valve body (1) along the axial direction of the outer wall of the valve body (1), and by controlling the rotational movement of the rotary switch (3), the locking pin (4) is synchronously driven to extend out of the end surface of the locking surface (11) and to be fixed in cooperation with another set of joints matched therewith; The front end portion of the positioning pin (5) passes through the locking surface (11) and extends outward, and the rear end portion is implanted into the valve body (1) along the axial direction of the outer wall of the valve body (1), and a positioning component is provided at the rear end portion, and the position of the positioning pin (5) in the length direction is limited by the positioning component.

2. The connector suitable for fluid transmission according to claim 1, characterized in that: The rear end portion of the valve body (1) is arranged as a tower-type tail portion (12), and is connected to a hose via the tower-type tail portion (12).

3. The connector suitable for fluid transmission according to claim 1, characterized in that: The locking surface (11) is fixed to the front end surface of the valve body (1) by means of bolt connection, and a hook (111) is provided at the front end for locking and protruding toward the outer side surface, and the hook (111) is used to achieve coordination and fixation with another set of structures.

4. The connector suitable for fluid transmission according to claim 1, characterized in that: The rotary switch (3) comprises a rotary handle (31) and a connecting bolt (32), wherein the connecting bolt (32) penetrates the upper wall of the valve body (1) and the upper part of the connecting bolt (32) is fixed to the rotary handle (31), and the lower part of the connecting bolt (32) is fixed to the upper part of the ball valve (2); The rotation of the rotary handle (31) drives the connecting bolt (32) to rotate synchronously, thereby controlling the deflection angle of the ball valve (2) connected to the connecting bolt (32).

5. The connector suitable for fluid transmission according to claim 4, characterized in that: A limit pin (201) is provided at the lower part where the ball valve (2) is located, and is connected to the inner edge of the lower wall where the valve body (1) is located via the limit pin (201); The ball valve (2) is caused to rotate about the central axis where the limit pin (201) and the connecting bolt (32) are located.

6. The connector suitable for fluid transmission according to claim 5, characterized in that: A through hole is provided downwardly in the middle portion where the limit pin (201) is located, and is communicated with the middle through hole where the ball valve (2) is located.

7. The connector suitable for fluid transmission according to claim 4, characterized in that: A guide pin (311) is disposed transversely on the rotating handle (31), the front end of the guide pin (311) protrudes outward, and the rear end is fixedly connected via a return spring, a first clearance gap (301) is formed in the middle of the guide pin (311), and a limiting ball (302) is disposed below the guide pin (311); When the guide pin (311) is in a non-pressurized state, under the action of the return spring, a non-central position of the guide pin (311) contacts the limiting ball (302), and generates downward pressure on the limiting ball (302), thereby limiting the deflection action of the rotating handle (31); When the front end of the guide pin (311) is under pressure, the first clearance gap (301) makes room for the lifting of the limiting ball (302), thereby achieving a deflection movement of the rotating handle (31) about the rotation center where the connecting bolt (32) is located.

8. The connector suitable for fluid transmission according to claim 7, characterized in that: Located below the limiting ball (302) of the rotating handle (31), sunken limiting grooves (303) are provided at both ends in the rotating direction, and the limiting ball (302) is placed in the limiting groove (303) for load bearing and limiting after the deflection is completed.

9. The connector suitable for fluid transmission according to claim 1, characterized in that: A helical tooth (402) is provided along the axial direction at the rear end portion where the locking pin (4) is located, and the helical tooth (402) is meshed with a toothed disc (312) provided on the rotating handle (31). The rotating handle (31) is rotated to drive the helical tooth (402) meshed with the toothed disc (312) to rotate and form a force that pushes the locking pin (4) outward.

10. The connector suitable for fluid transmission according to claim 9, characterized in that: The front end portion of the positioning pin (5) protrudes outward from the locking surface (11), and the rear end portion is fixedly connected via a return spring, and a third clearance gap (501) is formed in the middle portion of the positioning pin (5); A second clearance gap (401) is formed in the middle of the locking pin (4), and a connecting channel (101) is formed between the cavity connected to the locking pin (4) and the positioning pin (5), and a positioning ball (102) is filled in the connecting channel (101); When the locking pin (4) is pushed forward, the second clearance gap (401) where it is located is simultaneously pushed forward and squeezes the positioning ball (102), so that the positioning ball (102) enters the third clearance gap (501) where the positioning pin (5) is located along the connecting channel (101), and forms a limit to the positioning pin (5) in the length direction together with the connecting channel (101); The length of the connecting channel (101) where the locking pin (4) and the positioning pin (5) are located is less than the diameter length of the positioning ball (102).

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