Oil drip recovery device of valve

Abstract

The invention discloses a drip oil recovery device of a valve, and belongs to the technical field of valves, the drip oil recovery device comprises a valve body and a shell, an oil receiving cavity is formed in the shell, a rotating cavity is formed in the shell, a rotating ring is rotatably mounted in the rotating cavity, the oil receiving cavity is located between a butt joint port of the valve body and the rotating ring, and a moving cavity is formed in the rotating ring; a first inserting pipe is fixed to the side face, close to the rotating ring, of the oil receiving cavity in a penetrating mode, a connecting hole is formed in the side face, close to the oil receiving cavity, of the moving cavity and can communicate with the first inserting pipe, a second inserting pipe is fixed to the top of a pipeline of the valve body in a penetrating mode, and a mounting hole is formed in the side face, close to the valve body, of the moving cavity and can communicate with the second inserting pipe. One-way valves are arranged in the first inserting pipe and the second inserting pipe, a pushing block is slidably installed in the moving cavity in the radial direction of the rotating ring, and a driving piece used for pushing the pushing block to move is arranged on the shell. According to the device, leaked oil can be recycled, and waste of oil products is reduced.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to a valve dripping recovery device. Background Technology

[0002] Valves, as crucial devices for controlling fluid flow, are widely used in various industries such as petroleum, chemical, power, and water supply. Valves and pipelines are mostly connected by flanges. After long-term operation, slow leakage often occurs at the flanges due to aging gaskets, loose bolts, or pressure pulsations. Leaking oil drips down the outer wall of the valve, causing not only media waste, environmental pollution, and slippery risks, but also increased costs for manual wiping and waste oil disposal.

[0003] Existing technologies typically use independent oil collection trays or pallets to collect dripping oil. However, oil collection trays can only serve a collection function, and the oil will oxidize and deteriorate after long-term storage, requiring treatment as hazardous waste and increasing operating costs. Summary of the Invention

[0004] To address the problem of oil waste caused by dripping oil collected in an oil pan, this application provides a dripping oil recovery device for a valve.

[0005] The oil drip recovery device for a valve provided in this application adopts the following technical solution: An oil drip recovery device for a valve includes a valve body and a housing. The housing has an oil receiving chamber and a rotating chamber. A rotating ring is rotatably mounted within the rotating chamber. The oil receiving chamber is located between the valve body's interface and the rotating ring. A movable chamber is located within the rotating ring. A first insertion tube is fixedly inserted through the oil receiving chamber near the rotating ring. A connecting hole is provided on the movable chamber near the oil receiving chamber, allowing communication with the first insertion tube. A second insertion tube is fixedly inserted through the top of the valve body's pipe. An installation hole is provided on the movable chamber near the valve body, allowing communication with the second insertion tube. Both the first and second insertion tubes contain a one-way valve. A pushing block is slidably mounted within the movable chamber along the radial direction of the rotating ring. A driving component for moving the pushing block is provided on the housing.

[0006] By adopting the above technical solution, when the valve body is opened and separated, the dripping oil at the interface of the valve body enters the oil receiving chamber. The rotating ring is rotated until the connecting hole is aligned with the first insertion tube, and the pushing block is moved away from the valve body, so that a negative pressure is generated in the moving chamber. Under the action of negative pressure, the dripping oil in the oil receiving chamber enters the moving chamber through the connecting hole and the first insertion tube. Then, the rotating ring is rotated to align the mounting hole with the second insertion tube, and the pushing block is moved towards the valve body. Under the pushing force of the pushing block, the dripping oil in the moving chamber enters the valve body through the mounting hole and the second insertion tube, realizing the recycling of dripping oil and reducing oil waste.

[0007] Preferably, the outer circumferential surface of the rotating ring is provided with a push groove communicating with the moving cavity. The driving component includes a push rod slidably installed in the push groove. One end of the push rod is fixedly connected to the side of the push block away from the valve body. A stop block is fixed at the end of the push rod away from the push block. The stop block can abut against the outer circumferential surface of the housing. A connecting magnetic block one is fixedly fixed on the side of the stop block near the rotating ring. A connecting magnetic block two for attracting the connecting magnetic block one is embedded and fixed on the outer circumferential surface of the rotating ring.

[0008] By adopting the above technical solution, when the operator is not operating, connecting magnetic block one and connecting magnetic block two are attracted to each other, and the stop block is in contact with the outer circumferential surface of the rotating ring, making it difficult for the stop block to be displaced in the moving cavity and preventing external objects from accidentally operating the stop block.

[0009] Preferably, a limiting magnetic block is fixed to the side of the rotating ring, and an annular groove is formed on the side of the rotating cavity near the rotating ring. The limiting magnetic block is rotatably connected to the housing along the circumference of the valve body through the annular groove. A positioning magnetic block one and a positioning magnetic block two are fixed in the annular groove. The limiting magnetic block can be attracted to the positioning magnetic block one and the positioning magnetic block two respectively. The positioning magnetic block one is located above the valve body. When the limiting magnetic block is attracted to the positioning magnetic block one, the connecting hole is aligned with the insertion tube one. The positioning magnetic block two is located below the valve body. When the limiting magnetic block is attracted to the positioning magnetic block two, the mounting hole is aligned with the insertion tube two.

[0010] By adopting the above technical solution, when the limiting magnetic block and the positioning magnetic block 1 are attracted to each other, the connecting hole and the insertion tube 1 are aligned, so as to push the dripping oil in the moving cavity into the valve body; when the limiting magnetic block and the positioning magnetic block 2 are attracted to each other, the mounting hole and the insertion tube 2 are aligned, so as to draw the dripping oil in the oil receiving cavity into the moving cavity.

[0011] Preferably, a connecting groove is provided on the side of the rotating cavity near the rotating ring, and a connecting block is slidably installed in the rotating cavity along its own length direction through the connecting groove. A snap-fit ​​groove for inserting the connecting block is provided on the side of the rotating ring. When the connecting block is aligned with the snap-fit ​​groove, the mounting hole is aligned with the insertion tube. The housing is provided with a pusher for pushing the connecting block into the snap-fit ​​groove and a release member for pushing the connecting block out of the snap-fit ​​groove.

[0012] By adopting the above technical solution, when the valve body is working normally, the mounting hole and the insertion pipe are aligned. The connecting block is inserted into the snap-fit ​​groove, and the connecting block limits the connecting ring, so that the connecting ring is not easy to rotate under the action of external force, thereby improving the stability of the overall recovery device.

[0013] Preferably, the pushing member includes a snap-fit ​​spring, one end of which is fixedly connected to the side of the connecting block away from the rotating ring, and the other end of which is fixedly connected to the inner wall of the connecting groove.

[0014] By adopting the above technical solution, when the connecting block is aligned with the snap-fit ​​groove, the connecting block moves towards the rotating ring under the elastic force of the snap-fit ​​spring and inserts into the snap-fit ​​groove, thereby snapping and positioning the rotating ring.

[0015] Preferably, the release component includes a release block, and the outer peripheral surface of the housing is provided with a release groove that communicates with the connecting groove. The release block slides and engages with the housing along the radial direction of the valve body through the release groove. The top surface of the connecting block is provided with a clearance groove for the release block to pass through. The bottom surface of the release block is provided with a first inclined surface. The inner wall of the clearance groove away from the rotating ring is provided with a second inclined surface for abutting against the first inclined surface.

[0016] By adopting the above technical solution, when the rotating ring needs to be rotated, the release block is first pressed down, the release block moves in the clearance groove, the first inclined surface and the second inclined surface abut against each other, and then pushes the connecting block to move away from the rotating ring, so that the connecting block disengages from the locking groove, so that the rotating ring can be rotated.

[0017] Preferably, a reset block is fixed to the side of the release block, a reset groove is formed on the inner wall of the release groove, the reset block slides and engages with the housing along the radial direction of the valve body through the reset groove, a reset spring is fixed to the top surface of the reset block, and the end of the reset spring away from the reset block is fixedly connected to the inner top surface of the reset groove.

[0018] By adopting the above technical solution, the release block maintains a distance from the connecting block under the elastic force of the reset spring, so that inclined surface one and inclined surface two maintain a distance, so that the connecting block and the rotating ring can be locked together.

[0019] Preferably, the one-way valve includes two limiting rings fixed inside the insertion tube, a sealing block is provided between the two limiting rings, and a limiting spring is fixed between the end face of the sealing block and one of the limiting rings.

[0020] By adopting the above technical solution, the one-way valve allows the dripping oil in the oil receiving chamber to smoothly enter the moving chamber through the first insertion tube, and the dripping oil in the moving chamber to smoothly enter the valve body through the second insertion tube. Furthermore, the dripping oil in the moving chamber will not enter the oil receiving chamber through the first insertion tube, and the oil in the valve body will not enter the moving chamber through the second insertion tube.

[0021] In summary, this application includes at least one of the following beneficial technical effects: When the valve body is opened and separated, the dripping oil at the valve body's interface enters the oil receiving chamber. Rotate the rotating ring until the connecting hole aligns with the first insertion tube, and move the pushing block away from the valve body. This creates a negative pressure in the moving chamber, and the dripping oil in the oil receiving chamber enters the moving chamber through the connecting hole and the first insertion tube under the negative pressure. Then, rotate the rotating ring until the mounting hole aligns with the second insertion tube, and move the pushing block closer to the valve body. The dripping oil in the moving chamber enters the valve body through the mounting hole and the second insertion tube under the thrust of the pushing block, thus realizing the recycling of dripping oil and reducing oil waste. When the operator is not operating, connecting magnetic block one and connecting magnetic block two are attracted to each other, and the stop block is in contact with the outer circumferential surface of the rotating ring, making it difficult for the stop block to be displaced in the moving cavity and preventing external objects from accidentally operating the stop block. When the limiting magnetic block and the first positioning magnetic block are attracted to each other, the connecting hole and the first insertion tube are aligned to push the dripping oil in the moving cavity into the valve body; when the limiting magnetic block and the second positioning magnetic block are attracted to each other, the mounting hole and the second insertion tube are aligned to draw the dripping oil in the oil receiving cavity into the moving cavity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the valve dripping oil recovery device according to an embodiment of this application.

[0023] Figure 2 This is a cross-sectional view of the housing and valve body in the valve dripping recovery device of this application embodiment.

[0024] Figure 3 This is a schematic diagram of the one-way valve in the oil drip recovery device of the valve according to an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the structure of the housing and rotating ring in the valve dripping recovery device according to an embodiment of this application. Figure 5 yes Figure 2 Enlarged diagram of point A in the middle.

[0026] Figure 6 This is a schematic diagram of the connecting block and the releasing block in the valve dripping recovery device according to an embodiment of this application.

[0027] Reference numerals: 1. Valve body; 11. Insert pipe two; 2. Shell; 21. Rotating chamber; 22. Oil receiving chamber; 221. Insert pipe one; 3. Rotating ring; 31. Moving chamber; 32. Connecting hole; 33. Mounting hole; 34. Push block; 35. Push through groove; 36. Push rod; 37. Stop block; 38. Connecting magnetic block one; 39. Connecting magnetic block two; 4. Check valve; 41. Limiting ring; 42. Blocking block; 43. Limiting spring; 5. Limiting magnetic block; 51. Annular groove; 52. Positioning magnetic block one; 53. Positioning magnetic block two; 6. Connecting block; 61. Connecting groove; 62. Snap-fit ​​groove; 63. Snap-fit ​​spring; 64. Clearance through groove; 65. Inclined surface two; 7. Release block; 71. Release groove; 72. Inclined surface one; 73. Reset groove; 74. Reset block; 75. Reset spring. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0029] This application discloses an oil drip recovery device for a valve. (Refer to...) Figure 1 and Figure 2 The valve's drip recovery device includes a valve body 1 and a housing 2. A rotating chamber 21 is provided on the housing 2, and a rotating ring 3 is rotatably installed within the rotating chamber 21. An oil receiving chamber 22 is provided within the housing 2, located between the valve body 1's interface and the rotating ring 3. When the valve body 1 is opened and separated, the dripping oil from the valve body 1's interface enters the oil receiving chamber 22.

[0030] Reference Figure 1 and Figure 2 The rotating ring 3 has a movable cavity 31, and an insert tube 221 is fixedly inserted through the oil receiving cavity 22 near the rotating ring 3. A connecting hole 32 is provided on the side of the movable cavity 31 near the oil receiving cavity 22, allowing it to communicate with the insert tube 221. An insert tube 11 is fixedly inserted through the top of the pipe of the valve body 1, and an installation hole 33 is provided on the side of the movable cavity 31 near the valve body 1, allowing it to communicate with the insert tube 11.

[0031] Rotate the rotating ring 3 until the connecting hole 32 is aligned with the insertion tube 221. Move the pushing block 34 away from the valve body 1, so that a negative pressure is generated in the moving chamber 31. Under the action of the negative pressure, the dripping oil in the oil receiving chamber 22 enters the moving chamber 31 through the connecting hole 32 and the insertion tube 221. Then rotate the rotating ring 3 to align the mounting hole 33 with the insertion tube 11. Move the pushing block 34 closer to the valve body 1. Under the pushing force of the pushing block 34, the dripping oil in the moving chamber 31 enters the valve body 1 through the mounting hole 33 and the insertion tube 11, realizing the recycling of dripping oil and reducing oil waste.

[0032] Reference Figure 2 and Figure 3 Both the first insertion tube 221 and the second insertion tube 11 are equipped with one-way valves 4. Each one-way valve 4 includes two limiting rings 41 fixed within the first insertion tube 221. A sealing block 42 is positioned between the two limiting rings 41, and a limiting spring 43 is fixed between the end face of the sealing block 42 and one of the limiting rings 41. The one-way valves 4 ensure that dripping oil in the oil receiving chamber 22 can smoothly enter the moving chamber 31 through the first insertion tube 221, and dripping oil in the moving chamber 31 can smoothly enter the valve body 1 through the second insertion tube 11. Furthermore, dripping oil in the moving chamber 31 will not enter the oil receiving chamber 22 through the first insertion tube 221, and oil in the valve body 1 will not enter the moving chamber 31 through the second insertion tube 11.

[0033] Reference Figure 2 A push block 34 is radially slidably installed within the moving cavity 31 along the rotating ring 3. A push groove 35, communicating with the moving cavity 31, is formed on the outer circumferential surface of the rotating ring 3. A push rod 36 is radially slidably installed within the pushing groove 35 of the rotating ring 3. One end of the push rod 36 is fixedly connected to the side of the push block 34 away from the valve body 1. A stop block 37 is fixed to the end of the push rod 36 away from the push block 34, and the stop block 37 abuts against the outer circumferential surface of the housing 2. A connecting magnetic block 38 is fixed to the side of the stop block 37 near the rotating ring 3. A connecting magnetic block 39, used to attract the connecting magnetic block 38, is embedded and fixed to the outer circumferential surface of the rotating ring 3. When not in operation, the connecting magnetic blocks 38 and 39 attract each other, and the stop block 37 fits against the outer circumferential surface of the rotating ring 3, making it difficult for the stop block 37 to shift within the moving cavity 31 and preventing accidental operation of the stop block 37 by external objects.

[0034] Reference Figure 2 and Figure 4A limiting magnetic block 5 is fixed to the side of the rotating ring 3. An annular groove 51 is provided on the side of the rotating cavity 21 near the rotating ring 3. The limiting magnetic block 5 is rotatably connected to the housing 2 along the circumference of the valve body 1 through the annular groove 51. A positioning magnetic block 1 52 and a positioning magnetic block 2 53 are fixed in the annular groove 51. The limiting magnetic block 5 can be attracted to the positioning magnetic block 1 52 and the positioning magnetic block 2 53 respectively. The positioning magnetic block 1 52 is located above the valve body 1. When the limiting magnetic block 5 is attracted to the positioning magnetic block 1 52, the connecting hole 32 is aligned with the insertion tube 1 221. The positioning magnetic block 2 53 is located below the valve body 1. When the limiting magnetic block 5 is attracted to the positioning magnetic block 2 53, the mounting hole 33 is aligned with the insertion tube 2 11.

[0035] When the limiting magnetic block 5 and the positioning magnetic block 52 are attracted together, the connecting hole 32 is aligned with the insertion tube 221 so as to push the dripping oil in the moving cavity 31 into the valve body 1; when the limiting magnetic block 5 and the positioning magnetic block 53 are attracted together, the mounting hole 33 is aligned with the insertion tube 11 so as to draw the dripping oil in the oil receiving cavity 22 into the moving cavity 31.

[0036] Reference Figure 5 and Figure 6 A connecting groove 61 is provided on the side of the rotating cavity 21 near the rotating ring 3. A connecting block 6 is slidably mounted on the rotating cavity 21 along its length through the connecting groove 61. A snap-fit ​​groove 62 for inserting the connecting block 6 is provided on the side of the rotating ring 3. When the connecting block 6 is aligned with the snap-fit ​​groove 62, the mounting hole 33 is aligned with the insertion tube 11. A snap-fit ​​spring 63 is fixedly connected to the side of the connecting block 6 away from the rotating ring 3. The end of the snap-fit ​​spring 63 away from the connecting block 6 is fixedly connected to the inner wall of the connecting groove 61.

[0037] When the valve body 1 is working normally, the mounting hole 33 is aligned with the insertion tube 11. Under the elastic force of the snap-fit ​​spring 63, the connecting block 6 moves toward the rotating ring 3 and is inserted into the snap-fit ​​groove 62. The connecting block 6 limits the connection ring, so that the connection ring is not easy to rotate without the action of external force, thus improving the stability of the overall recovery device.

[0038] Reference Figure 5 and Figure 6The outer circumferential surface of the housing 2 is provided with a release groove 71 that communicates with the connecting groove 61. The housing 2 slides radially along the valve body 1 via the release groove 71 to install a release block 7. The top surface of the connecting block 6 is provided with a clearance groove 64 for the release block 7 to pass through. The bottom surface of the release block 7 is provided with a first inclined surface 72. The inner wall of the clearance groove 64 away from the rotating ring 3 is provided with a second inclined surface 65 for abutting against the first inclined surface 72. A reset block 74 is fixed to the side of the release block 7. The inner wall of the release groove 71 is provided with a reset groove 73. The reset block 74 slides radially along the valve body 1 and engages with the housing 2 via the reset groove 73. A reset spring 75 is fixed to the top surface of the reset block 74. The end of the reset spring 75 away from the reset block 74 is fixedly connected to the inner top surface of the reset groove 73.

[0039] When the rotating ring 3 needs to be rotated, first press the release block 7 downwards. The release block 7 moves in the clearance groove 64, and the inclined surface 1 72 and the inclined surface 2 65 abut against each other, thereby pushing the connecting block 6 to move away from the rotating ring 3, so that the connecting block 6 disengages from the locking groove 62, so that the rotating ring 3 can be rotated.

[0040] The implementation principle of the dripping oil recovery device for a valve according to an embodiment of this application is as follows: When the valve body 1 is opened and separated, the dripping oil at the interface of the valve body 1 enters the oil receiving chamber 22. The rotating ring 3 is rotated until the connecting hole 32 is aligned with the insertion tube 221. The pushing block 34 is moved away from the valve body 1, so that a negative pressure is generated in the moving chamber 31. Under the action of the negative pressure, the dripping oil in the oil receiving chamber 22 enters the moving chamber 31 through the connecting hole 32 and the insertion tube 221. Then, the rotating ring 3 is rotated to align the mounting hole 33 with the insertion tube 11. The pushing block 34 is moved closer to the valve body 1. Under the pushing force of the pushing block 34, the dripping oil in the moving chamber 31 enters the valve body 1 through the mounting hole 33 and the insertion tube 11, thereby realizing the recovery and utilization of dripping oil and reducing oil waste.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A valve dripping oil recovery device, characterized in that: The valve includes a valve body (1) and a housing (2). The housing (2) contains an oil receiving chamber (22) and a rotating chamber (21). A rotating ring (3) is rotatably mounted within the rotating chamber (21). The oil receiving chamber (22) is located between the valve body (1) and the rotating ring (3). A movable chamber (31) is provided within the rotating ring (3). A tube (221) is fixedly inserted into the oil receiving chamber (22) near the rotating ring (3). A connecting hole (32) is provided on the movable chamber (31) near the oil receiving chamber (22). The hole (32) can be connected to the first insertion tube (221). The second insertion tube (11) is fixedly installed on the top of the pipe of the valve body (1). The moving cavity (31) has an installation hole (33) on the side near the valve body (1). The installation hole (33) can be connected to the second insertion tube (11). Both the first insertion tube (221) and the second insertion tube (11) are provided with a one-way valve (4). The moving cavity (31) is slidably installed along the radial direction of the rotating ring (3). The housing (2) is provided with a driving component for pushing the pushing block (34) to move.

2. The valve dripping recovery device according to claim 1, characterized in that: The outer circumferential surface of the rotating ring (3) is provided with a push groove (35) that communicates with the moving cavity (31). The driving component includes a push rod (36) that is slidably installed in the push groove (35). One end of the push rod (36) is fixedly connected to the side of the push block (34) away from the valve body (1). A stop block (37) is fixed to the end of the push rod (36) away from the push block (34). The stop block (37) can abut against the outer circumferential surface of the housing (2). A connecting magnetic block one (38) is fixed to the side of the stop block (37) near the rotating ring (3). A connecting magnetic block two (39) for attracting the connecting magnetic block one (38) is embedded and fixed to the outer circumferential surface of the rotating ring (3).

3. The valve dripping recovery device according to claim 1, characterized in that: A limiting magnetic block (5) is fixed to the side of the rotating ring (3). An annular groove (51) is provided on the side of the rotating cavity (21) near the rotating ring (3). The limiting magnetic block (5) is rotatably connected to the housing (2) along the circumference of the valve body (1) through the annular groove (51). A positioning magnetic block one (52) and a positioning magnetic block two (53) are fixed in the annular groove (51). The limiting magnetic block (5) can respectively connect with the positioning magnetic block one (52) and the positioning magnetic block two (53). Positioning magnetic block two (53) is attracted to each other. Positioning magnetic block one (52) is located above the valve body (1). When the limiting magnetic block (5) is attracted to the positioning magnetic block one (52), the connecting hole (32) is aligned with the insertion tube one (221). Positioning magnetic block two (53) is located below the valve body (1). When the limiting magnetic block (5) is attracted to the positioning magnetic block two (53), the mounting hole (33) is aligned with the insertion tube two (11).

4. The valve dripping recovery device according to claim 1, characterized in that: The rotating cavity (21) has a connecting groove (61) on its side near the rotating ring (3). The rotating cavity (21) slides along its length direction through the connecting groove (61) to install the connecting block (6). The rotating ring (3) has a snap-fit ​​groove (62) on its side for inserting the connecting block (6). When the connecting block (6) is aligned with the snap-fit ​​groove (62), the mounting hole (33) is aligned with the second insertion tube (11). The housing (2) is provided with a pusher for pushing the connecting block (6) into the snap-fit ​​groove (62) and a release member for pushing the connecting block (6) out of the snap-fit ​​groove (62).

5. The valve dripping recovery device according to claim 4, characterized in that: The pusher includes a snap-fit ​​spring (63), one end of which is fixedly connected to the side of the connecting block (6) away from the rotating ring (3), and the other end of which is fixedly connected to the inner wall of the connecting groove (61).

6. The valve dripping recovery device according to claim 4, characterized in that: The release component includes a release block (7). The outer peripheral surface of the housing (2) is provided with a release groove (71) that communicates with the connecting groove (61). The release block (7) slides and engages with the housing (2) along the radial direction of the valve body (1) through the release groove (71). The top surface of the connecting block (6) is provided with a clearance groove (64) for passing through the release block (7). The bottom surface of the release block (7) is provided with a first inclined surface (72). The inner wall of the clearance groove (64) away from the rotating ring (3) is provided with a second inclined surface (65) for abutting against the first inclined surface (72).

7. The valve dripping recovery device according to claim 6, characterized in that: A reset block (74) is fixed to the side of the release block (7), and a reset groove (73) is provided on the inner wall of the release groove (71). The reset block (74) slides and engages with the housing (2) along the radial direction of the valve body (1) through the reset groove (73). A reset spring (75) is fixed to the top surface of the reset block (74), and the end of the reset spring (75) away from the reset block (74) is fixedly connected to the inner top surface of the reset groove (73).

8. The oil dripping recovery device for a valve according to claim 1, characterized in that: The one-way valve (4) includes two limiting rings (41) fixed inside the first insertion tube (221), and a blocking block (42) is provided between the two limiting rings (41). A limiting spring (43) is fixed between the end face of the blocking block (42) and one of the limiting rings (41).

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