Ball valve with protection function

Abstract

The invention provides a ball valve with a protection function, and belongs to the field of ball valves, the ball valve comprises a valve body, a liquid inlet pipe, a liquid outlet pipe and a ball body, the ball body is located on the inner side of the valve body, the liquid inlet pipe and the liquid outlet pipe are located on the two sides of the valve body, the valve body is fixedly connected with the liquid inlet pipe and the liquid outlet pipe, and the end of the liquid inlet pipe and the end of the liquid outlet pipe are fixedly connected with connecting flanges. The pressure relief assembly is arranged on the inner side and the bottom of the valve body, and the pressure relief assembly is used for relieving pressure in an external pipeline; the anti-leakage assembly is arranged on the inner side of the valve body, and the anti-leakage assembly is used for blocking when the ball valve is in abnormal high temperature; and the switch assembly is arranged above the valve body, and the switch assembly is used for opening and closing the ball valve. According to the pressure relief valve body, the first sealing seat is pushed by high-pressure fluid to move downwards to compress the first spring, so that the fluid flows into the liquid drainage pipe through the through holes of the upper support and the lower support and is relieved into the temporary liquid storage tank, and the pressure relief process of the valve body is completed.

Description

Technical Field

[0001] The present invention relates to the field of ball valves, in particular to a ball valve with a protective function. Background Art

[0002] A ball valve is a critical shutoff device widely used in industrial piping systems. Its core design utilizes a spherical valve body with a central opening as the opening and closing element. The valve stem drives the ball through a 90-degree rotation to control fluid flow. This valve offers unique structural advantages: when the ball's channel axis is aligned with the pipeline, full-bore, unobstructed flow is achieved, making it particularly suitable for applications requiring low flow resistance. When closed, the ball's surface tightly engages the elastic sealing seat, forming a bidirectional seal.

[0003] The ball valves currently in use usually do not have a pressure relief function. Their design mainly relies on the mechanical seal between the ball and the valve seat to block the flow of the medium. When the pressure of the connected pipeline system suddenly rises due to abnormal working conditions, the overpressure medium will continue to squeeze the sealing surface of the ball valve, causing soft sealing materials such as PTFE to permanently deform, thereby destroying the sealing performance.

[0004] How to invent a ball valve with a protective function to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a ball valve with a protection function, aiming to improve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides a ball valve with a protective function, comprising a valve body, a liquid inlet pipe, a liquid outlet pipe and a ball, wherein the ball is located on the inner side of the valve body, the liquid inlet pipe and the liquid outlet pipe are located on both sides of the valve body, the valve body is fixedly connected to the liquid inlet pipe and the liquid outlet pipe, the ends of the liquid inlet pipe and the liquid outlet pipe are fixedly connected with connecting flanges, the liquid inlet pipe and the liquid outlet pipe are fixedly connected to the external pipeline through the connecting flange, the outer side wall of the valve body is fixedly connected with an outer cover, and also includes: a pressure relief component, the pressure relief component is arranged on the inner side and bottom of the valve body, the pressure relief component is used for relieving the pressure in the external pipeline; an anti-leakage component, the anti-leakage component is arranged on the inner side of the valve body, the anti-leakage component is used for sealing the ball valve when the temperature is abnormally high; a switch component, the switch component is arranged above the valve body, and the switch component is used for opening and closing the ball valve.

[0008] Preferably, the pressure relief assembly includes a drain pipe fixedly connected to the bottom of the valve body, a temporary liquid storage tank is provided at the bottom of the drain pipe, the outer wall of the drain pipe is fixedly connected to the wheel cover, the outer wall of the wheel cover is arranged in an arc shape, a lower support is provided above the wheel cover, the lower support is fixedly connected to the inner wall of the drain pipe, the top of the lower support is fixedly connected to a first spring, the first spring is arranged in compression, the top of the first spring is fixedly connected to a first sealing seat, an upper support is provided above the first sealing seat, the center positions of the upper support and the lower support are both provided with through holes, and the first sealing seat is arranged to block the through holes of the upper support.

[0009] Preferably, the inner side wall of the valve body is fixedly connected to a second bracket, and the top of the second bracket is rotatably connected to a rotating seat.

[0010] Preferably, an impeller is provided on the inner side of the wheel cover, and a plurality of blades are provided on the impeller, one side of the plurality of blades is located on the inner side of the drain pipe, and the plurality of blades are distributed in a circle, and a central axis is fixedly connected to the center position of the impeller, and the impeller is rotatably connected to the inner wall of the wheel cover through the central axis, and a connecting rod is fixedly connected to the end of the central axis away from the wheel cover, and a second spring is fixedly connected to the top end of the connecting rod, and a pinball is fixedly connected to the top end of the second spring.

[0011] Preferably, the outer side wall of the valve body is fixedly connected to a first bracket, the bottom end of the first bracket is fixedly connected to a vibration cover, the vibration cover is arranged in a bowl shape, and the position of the vibration cover corresponds to the position of the pinball.

[0012] Preferably, the sphere is provided with a center hole and a circular channel, the circular channel is perpendicular to the center hole and is connected, a left support and a right support are fixedly connected in the circular channel of the sphere, the center positions of the left support and the right support are provided with through holes, a second sealing seat and a fourth spring are provided between the left support and the right support, the second sealing seat is provided to seal the through hole of the left support, one end of the fourth spring is fixedly connected to the second sealing seat, and the other end is fixedly connected to the side wall of the right support.

[0013] Preferably, the anti-leakage component includes two sealing grooves provided on the inner wall of the valve body, the sealing groove is annular, a sealing gasket is embedded in the inner side of the sealing groove, a sealing ring is fixedly connected to the sealing gasket, the side wall of the sealing ring is in contact with the outer wall of the sphere, a chamber is provided between the sphere and the inner wall of the valve body, the side wall of the sealing groove is provided with a sealing part, and the contour of the sealing part is corresponding to the outer contour of the sphere.

[0014] Preferably, mounting grooves are provided at the top and bottom of the sphere, and the mounting grooves are arranged in a rectangular groove shape.

[0015] Preferably, the switch assembly includes a top seat fixedly connected to the top of the valve body, a mounting plate is fixedly connected to the top of the top seat by screws, a handle is provided on the top of the mounting plate, a rotating rod is rotatably provided on the inner side wall of the top seat, a plurality of retaining rings are sleeved on the outer side wall of the rotating rod, the bottom end of the rotating rod is a rectangular structure, a plurality of third springs are provided in the rotating rod, steel balls are fixedly connected to both ends of the third spring, and the bottom of the rotating rod is clamped with the mounting groove through the steel balls.

[0016] Preferably, the bottom end of the rotating rod is embedded in the inner side of the mounting groove, and the length and width of the bottom end of the rotating rod are both smaller than the length and width of the mounting groove.

[0017] The beneficial effect of the present invention is that when the pipeline pressure is abnormal, the high-pressure fluid first enters the valve body through the liquid inlet pipe and fills the chamber, pushing the first sealing seat downward to compress the first spring, so that the fluid flows into the discharge pipe through the through holes of the upper support and the lower support to release the pressure to the temporary liquid storage tank, completing the pressure relief process of the valve body. At the same time, the flowing fluid drives the impeller to rotate, causing the pinball to hit the vibration cover to sound an alarm, reminding the staff that the valve body has released pressure due to encountering higher pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a ball valve with a protective function provided by an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of a ball valve body with a protective function provided by an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of a ball valve body with a protective function provided by an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 It is a schematic diagram of the structure of a ball valve installation groove with a protective function provided by an embodiment of the present invention.

[0024] In the figure: 1. valve body; 2. liquid inlet pipe; 3. liquid outlet pipe; 4. connecting flange; 5. top seat; 6. handle; 7. mounting plate; 8. outer cover; 9. drain pipe; 10. wheel cover; 11. lower support; 12. first spring; 13. upper support; 14. impeller; 15. center axis; 16. connecting rod; 17. second spring; 18. pinball; 19. first bracket; 20. vibration cover; 21. second bracket; 22. rotating seat; 23. first sealing seat; 301. left support; 302. second sealing seat; 303. fourth spring; 304. right support; 31. sealing groove; 32. sealing ring; 33. sealing gasket; 34. sphere; 40. center hole; 35. chamber; 36. rotating rod; 37. retaining ring; 38. steel ball; 39. third spring; 41. sealing part; 42. mounting groove. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] Example, refer to Figure 1-Figure 5 , a ball valve with a protective function, includes a valve body 1, a liquid inlet pipe 2, a liquid outlet pipe 3 and a ball 34, the ball 34 is located on the inner side of the valve body 1, the liquid inlet pipe 2 and the liquid outlet pipe 3 are located on both sides of the valve body 1, the valve body 1 is fixedly connected to the liquid inlet pipe 2 and the liquid outlet pipe 3, the ends of the liquid inlet pipe 2 and the liquid outlet pipe 3 are fixedly connected with a connecting flange 4, the liquid inlet pipe 2 and the liquid outlet pipe 3 are fixedly connected to the external pipeline through the connecting flange 4, the outer wall of the valve body 1 is fixedly connected with an outer cover 8, and also includes: a pressure relief component, the pressure relief component is arranged on the inner side and bottom of the valve body 1, the pressure relief component is used to relieve the pressure in the external pipeline; an anti-leakage component, the anti-leakage component is arranged on the inner side of the valve body 1, the anti-leakage component is used to seal the ball valve when it is abnormally high temperature; a switch component, the switch component is arranged above the valve body 1, and the switch component is used to open and close the ball valve.

[0027] The pressure relief assembly includes a drain pipe 9 fixedly connected to the bottom of the valve body 1, a temporary liquid storage tank is provided at the bottom of the drain pipe 9, the outer wall of the drain pipe 9 is fixedly connected to the wheel cover 10, the outer wall of the wheel cover 10 is arranged in an arc shape, a lower support 11 is provided above the wheel cover 10, the lower support 11 is fixedly connected to the inner wall of the drain pipe 9, the top of the lower support 11 is fixedly connected to the first spring 12, the first spring 12 is compressed, the top of the first spring 12 is fixedly connected to the first sealing seat 23, an upper support 13 is provided above the first sealing seat 23, the center positions of the upper support 13 and the lower support 11 are both provided with through holes, the first sealing seat 23 blocks the through hole of the upper support 13, the inner wall of the valve body 1 is fixedly connected to the second bracket 21, the top of the second bracket 21 is rotatably connected to the rotating seat 22 for supporting the ball 34, located on the inner side of the mounting groove 42 below the ball 34, and the structure is the same as the position below the rotating rod 36.

[0028] An impeller 14 is provided on the inner side of the wheel cover 10. The impeller 14 is provided with a plurality of blades. One side of the plurality of blades is located on the inner side of the drain pipe 9. The plurality of blades are distributed in a circle. The center position of the impeller 14 is fixedly connected to a center shaft 15. The impeller 14 is rotatably connected to the inner wall of the wheel cover 10 through the center shaft 15. The end of the center shaft 15 away from the wheel cover 10 is fixedly connected to a connecting rod 16. The top end of the connecting rod 16 is fixedly connected to a second spring 17. The top end of the second spring 17 is fixedly connected to a ball 18. The outer side wall of the valve body 1 is fixedly connected to a first bracket 19. The bottom end of the first bracket 19 is fixedly connected to a vibration cover 20. The vibration cover 20 is arranged in a bowl shape, and the position of the vibration cover 20 corresponds to the position of the ball 18.

[0029] It should be noted that the pressurized liquid entering the chamber 35 applies pressure to the first sealing seat 23, pushing the first sealing seat 23 to overcome the elastic force of the first spring 12, and the liquid enters the interior of the drain pipe 9, completing the pressure relief process of the ball valve and protecting the sealing parts of the sealing ring 32 and the ball 34 inside the ball valve from damage by high pressure.

[0030] When the liquid flows out of the drain pipe 9, since one side of the impeller 14 is located on the inner side of the drain pipe 9, the liquid pushes the blades on the impeller 14 when it flows, driving the impeller 14 to rotate, and driving the connecting rod 16, the second spring 17 and the pinball 18 to make circular motion through the central axis 15. When the pinball 18 rotates, it knocks on the vibration cover 20, causing the vibration cover 20 to make a sound due to vibration, reminding the staff that the ball valve has released pressure due to higher hydraulic pressure, and reminding the staff to check the cause of the abnormal pressure in the pipeline.

[0031] A center hole 40 and a circular channel are provided on the sphere 34. The circular channel is perpendicular to and connected to the center hole 40. A left support 301 and a right support 304 are fixedly connected in the circular channel of the sphere 34. Through holes are provided at the center positions of the left support 301 and the right support 304. A second sealing seat 302 and a fourth spring 303 are provided between the left support 301 and the right support 304. The second sealing seat 302 is provided to seal the through hole of the left support 301. One end of the fourth spring 303 is fixedly connected to the second sealing seat 302, and the other end is fixedly connected to the side wall of the right support 304.

[0032] It should be noted that when the ball valve is closed, the position of the left support 301 corresponds to the position of the liquid inlet pipe 2. If the pressure in the pipeline increases to a level greater than the elastic force of the fourth spring 303 at this time, the fourth spring 303 is compressed, so that the second sealing seat 302 no longer seals the left support 301, and the liquid in the pipeline passes through the left support 301 and the right support 304 into the center hole 40 and the chamber 35.

[0033] The anti-leakage component includes two sealing grooves 31 provided on the inner wall of the valve body 1. The sealing groove 31 is annular. A sealing gasket 33 is embedded in the inner side of the sealing groove 31. A sealing ring 32 is fixedly connected to the sealing gasket 33. The side wall of the sealing ring 32 is in contact with the outer wall of the ball 34. A chamber 35 is provided between the ball 34 and the inner wall of the valve body 1. The side wall of the sealing groove 31 is provided with a sealing portion 41. The contour of the sealing portion 41 is corresponding to the outer contour of the ball 34. The top and bottom of the ball 34 are provided with mounting grooves 42. The mounting grooves 42 are rectangular grooves. By rotating the ball 34, the center hole 40 on the ball 34 is perpendicular to the liquid outlet pipe 3. By setting the sealing ring 32 to fit the outer wall of the ball 34, the liquid is sealed by the cooperation of the sealing ring 32 and the ball 34, thereby preventing the liquid from passing through the ball valve and completing the closing action of the ball valve.

[0034] The switch assembly includes a top seat 5 fixedly connected to the top of the valve body 1, and a mounting plate 7 is fixedly connected to the top of the top seat 5 by screws. A handle 6 is provided on the top of the mounting plate 7, and a rotating rod 36 is rotatably provided on the inner side wall of the top seat 5. The outer side wall of the rotating rod 36 is sleeved with multiple retaining rings 37. The bottom end of the rotating rod 36 is a rectangular structure, and multiple third springs 39 are provided in the rotating rod 36. The two ends of the third spring 39 are fixedly connected with steel balls 38. The bottom of the rotating rod 36 is engaged with the mounting groove 42 through the steel balls 38, and the bottom end of the rotating rod 36 is embedded in the inner side of the mounting groove 42. The length and width of the bottom end of the rotating rod 36 are both smaller than the length and width of the mounting groove 42. By rotating the handle 6, the rotating rod 36 is driven to rotate, and the ball 34 is driven to rotate through the mounting groove 42. The center hole 40 on the ball 34 is connected to the liquid inlet pipe 2 and the liquid outlet pipe 3 to complete the opening of the ball valve.

[0035] It should be noted that: when the ball valve is in a closed state, if the sealing ring 32 melts due to abnormal high temperature phenomena such as fire, the ball valve will be subjected to the pressure of the liquid in the pipeline, which will apply a thrust to the ball 34 in the direction of the liquid outlet pipe 3. Since a rectangular mounting groove 42 is provided, the ball 34 slides in the direction of the liquid outlet pipe 3 under the pressure of the liquid. At this time, the bottom of the rotating rod 36 slides relative to the mounting groove 42, and the outer wall of the ball 34 fits the sealing part 41, so that the ball 34 seals the outlet of the liquid outlet pipe 3, thereby preventing the sealing ring 32 from losing its sealing effect, causing the liquid in the pipeline to flow out quickly.

[0036] In this embodiment, in the normally open state, the operator rotates the handle 6 to drive the rotating rod 36 to rotate, and the ball 34 is driven to rotate through the engagement of the steel ball 38 with the mounting groove 42, so that the center hole 40 is aligned with the liquid inlet pipe 2 and the liquid outlet pipe 3. The fluid enters the valve body 1 from the liquid inlet pipe 2, flows through the center hole 40 of the ball 34, and then flows out from the liquid outlet pipe 3; when closing, the handle 6 is rotated in the opposite direction to make the center hole 40 perpendicular to the pipeline direction. At this time, the sealing ring 32 and the ball 34 fit tightly to block the fluid.

[0037] When the pipeline pressure is abnormal, the high-pressure fluid first enters the valve body 1 through the liquid inlet pipe 2 and fills the chamber 35, pushing the first sealing seat 23 to move downward and compressing the first spring 12, so that the fluid flows into the discharge pipe 9 through the through holes of the upper support 13 and the lower support 11 to release the pressure to the temporary liquid storage tank. At the same time, the flowing fluid drives the impeller 14 to rotate, causing the marble 18 to knock on the vibration cover 20 to sound an alarm; if overpressure occurs on the side of the liquid inlet pipe 2 when the valve is closed, the high-pressure fluid enters the circular channel of the ball 34 through the liquid inlet pipe 2, pushing the second sealing seat 302 to compress the fourth spring 303, so that the fluid passes through the through hole of the left support 301 and the center hole 40 in turn and then enters the chamber 35 to trigger the pressure relief process.

[0038] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0039] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A ball valve with a protective function, comprising a valve body (1), a liquid inlet pipe (2), a liquid outlet pipe (3) and a ball (34), wherein the ball (34) is located inside the valve body (1), the liquid inlet pipe (2) and the liquid outlet pipe (3) are located on both sides of the valve body (1), the valve body (1) is fixedly connected to the liquid inlet pipe (2) and the liquid outlet pipe (3), the ends of the liquid inlet pipe (2) and the liquid outlet pipe (3) are fixedly connected to a connecting flange (4), the liquid inlet pipe (2) and the liquid outlet pipe (3) are fixedly connected to an external pipeline through the connecting flange (4), and the outer wall of the valve body (1) is fixedly connected to an outer cover (8), characterized in that Also includes: A pressure relief component, the pressure relief component is arranged on the inner side and bottom of the valve body (1), and the pressure relief component is used to relieve the pressure in the external pipeline; An anti-leakage component, the anti-leakage component is arranged on the inner side of the valve body (1), and the anti-leakage component is used for blocking the ball valve when the temperature is abnormally high; A switch assembly is provided above the valve body (1), and is used for opening and closing the ball valve.

2. A ball valve with a protective function according to claim 1, characterized in that: The pressure relief assembly includes a drain pipe (9) fixedly connected to the bottom of the valve body (1), a temporary liquid storage tank is provided at the bottom of the drain pipe (9), the outer wall of the drain pipe (9) is fixedly connected to the wheel cover (10), the outer wall of the wheel cover (10) is arranged in an arc shape, a lower support (11) is provided above the wheel cover (10), the lower support (11) is fixedly connected to the inner wall of the drain pipe (9), the top of the lower support (11) is fixedly connected to a first spring (12), the first spring (12) is arranged in a compression setting, the top of the first spring (12) is fixedly connected to a first sealing seat (23), an upper support (13) is provided above the first sealing seat (23), the center positions of the upper support (13) and the lower support (11) are both provided with through holes, and the first sealing seat (23) is provided to block the through hole of the upper support (13).

3. The ball valve with protection function according to claim 1, characterized in that: The inner side wall of the valve body (1) is fixedly connected to a second bracket (21), and the top of the second bracket (21) is rotatably connected to a rotating seat (22).

4. A ball valve with a protective function according to claim 2, characterized in that: An impeller (14) is provided on the inner side of the wheel cover (10), and a plurality of blades are provided on the impeller (14). One side of the plurality of blades is located on the inner side of the drain pipe (9), and the plurality of blades are distributed in a circular pattern. The center position of the impeller (14) is fixedly connected to a central shaft (15). The impeller (14) is rotatably connected to the inner wall of the wheel cover (10) through the central shaft (15). The end of the central shaft (15) away from the wheel cover (10) is fixedly connected to a connecting rod (16). The top end of the connecting rod (16) is fixedly connected to a second spring (17), and the top end of the second spring (17) is fixedly connected to a pinball (18).

5. A ball valve with a protective function according to claim 4, characterized in that: The outer wall of the valve body (1) is fixedly connected to a first bracket (19), and the bottom end of the first bracket (19) is fixedly connected to a vibration cover (20). The vibration cover (20) is arranged in a bowl shape, and the position of the vibration cover (20) corresponds to the position of the pinball (18).

6. The ball valve with protection function according to claim 2, characterized in that: The sphere (34) is provided with a central hole (40) and a circular channel, and the circular channel is arranged perpendicular to and in communication with the central hole (40). A left support (301) and a right support (304) are fixedly connected in the circular channel of the sphere (34). The center positions of the left support (301) and the right support (304) are both provided with through holes. A second sealing seat (302) and a fourth spring (303) are provided between the left support (301) and the right support (304). The second sealing seat (302) is provided to block the through hole of the left support (301). One end of the fourth spring (303) is fixedly connected to the second sealing seat (302), and the other end is fixedly connected to the side wall of the right support (304).

7. The ball valve with protection function according to claim 1, characterized in that: The anti-leakage component comprises two sealing grooves (31) provided on the inner side wall of the valve body (1), the sealing groove (31) being annular, a sealing gasket (33) being embedded in the inner side of the sealing groove (31), a sealing ring (32) being fixedly connected to the sealing gasket (33), the side wall of the sealing ring (32) being in contact with the outer side wall of the sphere (34), a chamber (35) being provided between the sphere (34) and the inner side wall of the valve body (1), a sealing portion (41) being provided on the side wall of the sealing groove (31), the contour of the sealing portion (41) being corresponding to the outer contour of the sphere (34).

8. The ball valve with protection function according to claim 7, characterized in that: The top and bottom of the sphere (34) are provided with mounting grooves (42), and the mounting grooves (42) are arranged in a rectangular groove shape.

9. The ball valve with protection function according to claim 8, characterized in that: The switch assembly includes a top seat (5) fixedly connected to the top of the valve body (1), a mounting plate (7) is fixedly connected to the top of the top seat (5) by screws, a handle (6) is provided on the top of the mounting plate (7), a rotating rod (36) is rotatably provided on the inner side wall of the top seat (5), a plurality of retaining rings (37) are sleeved on the outer side wall of the rotating rod (36), the bottom end of the rotating rod (36) is a rectangular parallelepiped structure, a plurality of third springs (39) are provided in the rotating rod (36), and steel balls (38) are fixedly connected to both ends of the third spring (39), and the bottom of the rotating rod (36) is clamped with the mounting groove (42) through the steel balls (38).

10. The ball valve with protection function according to claim 9, characterized in that: The bottom end of the rotating rod (36) is embedded in the inner side of the mounting groove (42), and the length and width of the bottom end of the rotating rod (36) are both smaller than the length and width of the mounting groove (42).

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