Tree seedling nutrient solution drip irrigation device

Abstract

The sapling nutrient solution drip irrigation device comprises a nutrient solution hanging bag, a butt joint cap nozzle barrel is fixedly inserted into the bottom of the nutrient solution hanging bag, and the bottom of the butt joint cap nozzle barrel is inserted into an outer sleeve cap barrel. According to the sapling nutrient solution drip irrigation device, a first pushing disc and an upper sealing barrel are driven by a pushing threaded barrel to perform sealed downward pushing displacement in a telescopic outer sleeve, and a second pushing disc and a lower sealing barrel are driven to perform sealed downward pushing displacement in a straight-through air pressure barrel again in cooperation with threaded telescopic displacement of a rotary adjusting bottom sleeve ring and a straight-through air pressure barrel; meanwhile, a sealing pushing and supporting block which blocks a top opening of an air inlet cylinder is pushed and pressed through pressure in a straight-through air pressure cylinder, so that compressed air in the straight-through air pressure cylinder and a telescopic outer sleeve is conveyed into a nutrient solution hanging bag through the air inlet cylinder, and therefore the pressure of the nutrient solution dripping tank can be adjusted at any time according to use requirements; and the drip irrigation of the nutrient solution is smoother and more reasonable.

Description

TECHNICAL FIELD

[0001] The utility model relates to sapling maintenance technical field, concretely is a kind of sapling nutrient solution drip irrigation device. BACKGROUND

[0002] Tree hangs needle liquid is also called tree hangs bag liquid, with people for beautiful, green, purify, the environment of fragrant, in city every year seasonally transplant many green trees, but the transplanting of sapling can make its root system be damaged, lead to the ability of root system to absorb water and nutrient not strong, in addition to the evaporation of part of tree leaf water, it is easy to make the tree transplanted dry and die, so it is a good method to use tree nutrient solution to give the tree drip bottle directly to supplement the nutrition of tree, tree nutrient solution can improve photosynthesis, promote growth and development, enhance resistance, improve fruit quality, prevent and cure diseases and pests, when using tree nutrient solution, appropriate formula liquid should be selected according to specific needs. At present, the existing sapling nutrient solution drip irrigation hanging bag liquid has certain drawbacks in actual use, that is, the pressure of its nutrient solution drip tank cannot be reasonably adjusted according to actual needs, so that nutrient solution drip irrigation is not smooth, and the phenomenon of pipe head blockage often occurs. SUMMARY

[0003] In view of the defects of the prior art, the sapling nutrient solution drip irrigation device is provided, which solves the problems that the existing sapling nutrient solution drip irrigation hanging bag liquid has certain drawbacks in actual use, that is, the pressure of its nutrient solution drip tank cannot be reasonably adjusted according to actual needs, so that nutrient solution drip irrigation is not smooth, and the phenomenon of pipe head blockage often occurs.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of sapling nutrient solution drip irrigation device, including nutrient solution hanging bag, the bottom of the nutrient solution hanging bag is fixed and inserted into docking cap mouth cylinder, the bottom of the docking cap mouth cylinder is inserted into the inside of outer sleeve cap cylinder, the surface of the docking cap mouth cylinder is threadedly coupled with the inner wall of outer sleeve cap cylinder, the bottom of the outer sleeve cap cylinder is connected with drip irrigation hose, the surface of the drip irrigation hose is equipped with flow regulator, and the tail end is connected with insertion drip nozzle, the top of the nutrient solution hanging bag is provided with hanging rope, the surface of the nutrient solution hanging bag is fixed and inserted into air inlet cylinder and liquid inlet cylinder, the top of the air inlet cylinder is provided with straight-through air pressure cylinder, the outer surface of the straight-through air pressure cylinder is provided with screw groove, the top of the straight-through air pressure cylinder is inserted into the inside of telescopic outer sleeve cylinder, the surface of the straight-through air pressure cylinder is threadedly coupled with rotary adjustment bottom sleeve ring, the top of the rotary adjustment bottom sleeve ring is rotatably connected with the bottom end of telescopic outer sleeve cylinder, the top of the liquid inlet cylinder is inserted into the inside of closed cylinder, the surface of the liquid inlet cylinder is threadedly coupled with the inner wall of closed cylinder.

[0005] Preferably, the top of the telescopic outer sleeve is inserted with a pushing threaded cylinder, the surface of the pushing threaded cylinder is screwed with the inner wall of the top plate of the telescopic outer sleeve, the top of the pushing threaded cylinder is fixedly provided with a rotating cap cylinder, one end of the pushing threaded cylinder in the telescopic outer sleeve is rotatably connected with a first pushing disc, the surface of the first pushing disc is fixedly sleeved with an upper sealing cylinder, the upper sealing cylinder is in extrusion contact with the inner wall of the telescopic outer sleeve, two vertical lifting rods are slidably arranged on the surface of the first pushing disc, the top of the two vertical lifting rods is fixedly connected with the inner wall of the telescopic outer sleeve, the bottom of the two vertical lifting rods is fixedly connected with the top surface of a second pushing disc, and the surface of the second pushing disc is fixedly sleeved with a lower sealing cylinder.

[0006] Preferably, the inner wall of the air inlet cylinder is fixedly provided with an inner supporting disc, the upper side of the inner supporting disc is provided with a pushing sealing plate, the top of the pushing sealing plate is fixedly provided with a sealing pushing supporting block, the top end of the sealing pushing supporting block is inserted into the opening formed in the top surface of the air inlet cylinder, the bottom surface of the pushing sealing plate is fixedly provided with two reset springs, the other end of the two reset springs is fixedly connected with the top surface of the inner supporting disc, the two sides of the pushing sealing plate are fixedly provided with pushing sleeve, the inner ring of the pushing sleeve is slidably sleeved with the surface of the vertical sliding rod, and the two ends of the vertical sliding rod are fixedly connected with the top surface of the inner supporting disc and the inner wall of the air inlet cylinder.

[0007] Preferably, the left side of the telescopic outer sleeve is fixedly inserted with an air inlet nozzle, the left end of the air inlet nozzle is inserted into the inside of a nozzle cap button, the inner wall of the nozzle cap button is screwed with the surface of the air inlet nozzle, and the inner wall of the nozzle cap button is fixedly provided with a sealing gasket disc.

[0008] Preferably, the outer ring diameter of the lower sealing cylinder is equal to the inner ring diameter of the straight-through air pressure cylinder, the top of the straight-through air pressure cylinder is fixedly provided with a sealing butt joint cylinder along the mouth, the annular outer surface of the sealing butt joint cylinder is in extrusion contact with the inner wall of the telescopic outer sleeve, and the inner wall of the sealing butt joint cylinder is provided in a tapered cylinder shape.

[0009] The utility model provides a kind of sapling nutrient solution drip irrigation device.It has the following beneficial effects:

[0010] (1) The seedling nutrient solution drip irrigation device, through the setting of a straight-through air pressure cylinder, a telescopic outer sleeve, a rotary bottom sleeve, a top-pushing threaded cylinder and a first push plate, utilizes the threaded propulsion principle of the top-pushing threaded cylinder to drive the first push plate and the upper sealing cylinder to be sealed and pushed downward inside the telescopic outer sleeve. In addition, in conjunction with the telescopic displacement of the rotary bottom sleeve and the threaded telescopic displacement of the straight-through air pressure cylinder, the second push plate and the lower sealing cylinder are driven to be sealed and pushed downward inside the straight-through air pressure cylinder again. At the same time, the pressure inside the straight-through air pressure cylinder pushes and seals the sealing push block at the top of the air inlet, so that the compressed gas inside the straight-through air pressure cylinder and the telescopic outer sleeve is sent to the inside of the nutrient solution hanging bag through the air inlet. Thus, the pressure of the nutrient solution drip tank can be adjusted at any time according to the usage needs, so that the nutrient solution drip irrigation is smoother and more reasonable. Attached Figure Description

[0011] Figure 1 This is a front view of the structure of this utility model;

[0012] Figure 2 The structure of this utility model Figure 1 Enlarged view of point A;

[0013] Figure 3 The structure of this utility model Figure 2 Enlarged view of point B;

[0014] Figure 4 The structure of this utility model Figure 2 Enlarged internal view of point B;

[0015] Figure 5 The structure of this utility model Figure 4 Enlarged view of point C;

[0016] Figure 6 The structure of this utility model Figure 4 Enlarged diagram of point D;

[0017] Figure 7 The structure of this utility model Figure 4 Enlarged diagram of point E.

[0018] In the diagram: 1. Nutrient solution hanging bag; 2. Connecting cap nozzle; 3. Outer cap nozzle; 4. Drip irrigation hose; 5. Hanging rope; 6. Air inlet cylinder; 7. Straight-through air pressure cylinder; 8. Telescopic outer sleeve; 9. Adjustable bottom collar; 10. Liquid inlet cylinder; 11. Sealing cylinder; 12. Push threaded cylinder; 13. Rotating cap nozzle; 14. First push plate; 15. Upper sealing cylinder; 16. Vertical hanging rod; 17. Second push plate; 18. Lower sealing cylinder; 19. Sealing connecting cylinder; 20. Inner support plate; 21. Push sealing plate; 22. Sealing push support block; 23. Return spring; 24. Push sleeve; 25. Vertical sliding rod; 26. Limiting ring; 27. Air inlet nozzle; 28. Nozzle cap button. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1-7As shown, this utility model provides a technical solution: a seedling nutrient solution drip irrigation device, including a nutrient solution hanging bag 1, a connecting cap nozzle tube 2 fixedly inserted into the bottom of the nutrient solution hanging bag 1, the bottom of the connecting cap nozzle tube 2 inserted into the inside of an outer cap tube 3, the surface of the connecting cap nozzle tube 2 threadedly connected to the inner wall of the outer cap tube 3, a drip irrigation hose 4 connected to the bottom of the outer cap tube 3, a flow regulator fitted on the surface of the drip irrigation hose 4, and a drip nozzle connected to the end, a hanging rope 5 provided at the top of the nutrient solution hanging bag 1, an air inlet cylinder 6 and a liquid inlet cylinder 10 fixedly inserted into the surface of the nutrient solution hanging bag 1, an inner support plate 20 fixedly provided on the inner wall of the air inlet cylinder 6, a push-sealing plate 21 provided above the inner support plate 20, and a sealing push-support block 22 fixedly provided on the top of the push-sealing plate 21. The top of the sealing pusher block 22 is inserted into the opening on the top surface of the air inlet cylinder 6. Two return springs 23 are fixedly installed on the bottom surface of the push sealing plate 21. The other ends of the two return springs 23 are fixedly connected to the top surface of the inner support plate 20. Push sleeves 24 are fixedly installed on both sides of the push sealing plate 21. The inner ring of the push sleeve 24 is slidably sleeved with the surface of the vertical slide rod 25. The two ends of the vertical slide rod 25 are fixedly connected to the top surface of the inner support plate 20 and the inner wall of the air inlet cylinder 6, respectively. Through the arrangement of the inner support plate 20, the push sealing plate 21, the sealing pusher block 22, the push sleeve 24, and the vertical slide rod 25, when the sealing pusher block 22 is movable and can be blocked in the top opening of the air inlet cylinder 6, the air pressure inside the direct air pressure cylinder 7 can be smoothly blocked when it is excessively compressed. The gas is discharged into the nutrient solution hanging bag 1. When the internal pressure of the nutrient solution hanging bag 1 is too high, the gas cannot return to the straight-through air pressure cylinder 7. The surface of the vertical sliding rod 25 is fixedly fitted with a limiting ring 26. The limiting ring 26 restricts the downward displacement of the pushing sealing plate 21. The top of the air inlet cylinder 6 is provided with a straight-through air pressure cylinder 7. The outer surface of the straight-through air pressure cylinder 7 is provided with a threaded groove. The top of the straight-through air pressure cylinder 7 is inserted into the interior of the telescopic outer sleeve 8. The left side of the telescopic outer sleeve 8 is fixedly inserted with an air inlet nozzle 27. The left end of the air inlet nozzle 27 is inserted into the interior of the nozzle cap 28. The inner wall of the nozzle cap 28 is threadedly fitted with the surface of the air inlet nozzle 27. The inner wall of the nozzle cap 28 is fixedly provided with a sealing gasket. The nozzle cap 28 and the air inlet nozzle 27 are connected by a sealing gasket plate. The configuration of valve 7 allows for the replenishment of gas into the telescopic outer sleeve 8 through the closure or detachment of the air inlet nozzle 27 and the nozzle cap button 28. A rotary bottom sleeve 9 is threaded onto the surface of the straight-through air cylinder 7, with its top rotatably connected to the bottom end of the telescopic outer sleeve 8. A push-threaded cylinder 12 is inserted into the top of the telescopic outer sleeve 8, its surface threaded to the inner wall of the top plate of the telescopic outer sleeve 8. A rotating cap cylinder 13 is fixedly mounted on the top of the push-threaded cylinder 12. A first push plate 14 is rotatably connected to one end of the push-threaded cylinder 12 inside the telescopic outer sleeve 8, with an upper sealing cylinder 15 fixedly fitted onto its surface. The upper sealing cylinder 15 is in contact with the inner wall of the telescopic outer sleeve 8.Two vertical hangers 16 slide through the surface of the first push plate 14. The tops of the two vertical hangers 16 are fixedly connected to the inner wall of the telescopic outer sleeve 8, and the bottoms of the two vertical hangers 16 are fixedly connected to the top surface of the second push plate 17. A lower sealing cylinder 18 is fixedly fitted onto the surface of the second push plate 17. The outer diameter of the lower sealing cylinder 18 is the same as the inner diameter of the straight-through air cylinder 7. Through the arrangement of the straight-through air cylinder 7, the telescopic outer sleeve 8, the adjusting bottom collar 9, the push-threaded cylinder 12, the first push plate 14, the vertical hangers 16, and the second push plate 17, the first push plate 14 and the upper sealing cylinder 15 are pushed downwards and sealed inside the telescopic outer sleeve 8 by the threaded propulsion principle of the push-threaded cylinder 12. Simultaneously, the adjusting bottom collar 9 and the threaded telescopic displacement of the straight-through air cylinder 7 cause the second push plate 17 and the lower sealing cylinder 18 to be pushed downwards and sealed inside the straight-through air cylinder 7. The pressure pushes and seals the sealing support block 22 at the top of the air inlet cylinder 6, allowing the compressed gas inside the direct-flow air pressure cylinder 7 and the telescopic outer sleeve 8 to be delivered through the air inlet cylinder 6 to the inside of the nutrient solution hanging bag 1. This allows for adjustment of the pressure of the nutrient solution drip tank according to usage needs, resulting in smoother and more efficient nutrient solution dripping. A sealing docking cylinder 19 is fixedly installed at the top edge of the direct-flow air pressure cylinder 7. The annular outer surface of the sealing docking cylinder 19 is in contact with the inner wall of the telescopic outer sleeve 8. The inner wall of the sealing docking cylinder 19 is conical. This design improves the sealing performance when the direct-flow air pressure cylinder 7 and the telescopic outer sleeve 8 undergo telescopic displacement. The top of the liquid inlet cylinder 10 is inserted into the interior of the sealing cylinder 11. The surface of the liquid inlet cylinder 10 is threadedly connected to the inner wall of the sealing cylinder 11. The liquid inlet cylinder 10 and the sealing cylinder 11 allow for replenishment of the nutrient solution hanging bag 1.

[0021] When it is necessary to increase the infusion pressure of the drip irrigation solution, the knob on the cap 13 rotates, causing the push-threaded cylinder 12 to rotate. Utilizing the threaded propulsion principle generated by the push-threaded cylinder 12 and the telescopic outer sleeve 8, the first push plate 14 and the upper sealing cylinder 15 are pushed downwards and sealed inside the telescopic outer sleeve 8. This compresses the gas inside the cylinder through the straight-through air cylinder 7 and the air inlet cylinder 6 into the nutrient solution hanging bag 1. Additionally, the adjustable bottom sleeve 9 can be rotated, causing it to move inwards and outwards through the threaded connection between the adjustable bottom sleeve 9 and the straight-through air cylinder 7. This pushes the second push plate 17 and the lower sealing cylinder 18 again. The internal seal of the straight-through air pressure cylinder 7 is pushed downward, and at the same time, the pressure of the gas inside the straight-through air pressure cylinder 7 pushes the sealing push block 22 at the top of the air inlet cylinder 6 downward, so that the inside of the air inlet cylinder 6 is connected to the straight-through air pressure cylinder 7. At this time, the compressed gas in the straight-through air pressure cylinder 7 and the telescopic outer sleeve 8 is sent to the inside of the nutrient solution hanging bag 1 through the air inlet cylinder 6, increasing the pressure inside the nutrient solution hanging bag 1 and making it equal to the pressure inside the straight-through air pressure cylinder 7. This increases the infusion pressure of the drip irrigation fluid, allowing the pressure of the nutrient solution drip tank to be adjusted at any time according to the usage needs. When it is necessary to continue to adjust the pressure inside the nutrient solution hanging bag 1... When providing pressurization, first rotate the cap cylinder 13 in the reverse direction, causing it to drive the first push plate 14 and the upper sealing cylinder 15 to be sealed and pushed upward inside the telescopic outer sleeve 8 to the space above the air inlet nozzle 27. Then, rotate the nozzle cap button 28 on the left side of the telescopic outer sleeve 8 to allow external air to flow into the interior of the telescopic outer sleeve 8. Next, rotate the push threaded cylinder 12 to push the upper sealing cylinder 15 to the space below the air inlet nozzle 27. Then, rotate the adjusting bottom sleeve 9 in the reverse direction, causing the second push plate 17 and the lower sealing cylinder 18 to be sealed and pushed upward inside the straight-through air pressure cylinder 7, causing the second push plate 17 and the lower sealing cylinder 18 to be moved to the space above the air inlet nozzle 27. The same principle applies when the outer sleeve 8 is retracted. The forward rotation pushes the threaded cylinder 12, causing the first pusher 14 to pressurize the incoming gas into the straight-through air cylinder 7. Then, by rotating the bottom sleeve 9, the straight-through air cylinder 7 extends and retracts into the telescopic outer sleeve 8, causing it to push the second pusher 17 and the lower sealing cylinder 18 to seal and push downward within the straight-through air cylinder 7, pushing the gas into the nutrient solution hanging bag 1 to increase its internal pressure and thus increase the pressure of the dripping flow. All contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0022] In summary, this seedling nutrient solution drip irrigation device, through the arrangement of a straight-through air pressure cylinder 7, a telescopic outer sleeve 8, a rotary bottom sleeve 9, a push-pull threaded cylinder 12, and a first push plate 14, utilizes the threaded propulsion principle of the push-pull threaded cylinder 12 to drive the first push plate 14 and the upper sealing cylinder 15 to be pushed downward within the telescopic outer sleeve 8. Simultaneously, the rotary bottom sleeve 9, in conjunction with the threaded telescopic displacement of the straight-through air pressure cylinder 7, drives the second push plate 17 and the lower sealing cylinder 18 to be pushed downward again within the straight-through air pressure cylinder 7. At the same time, the pressure inside the straight-through air pressure cylinder 7 pushes and seals the sealing push block 22 at the top of the air inlet cylinder 6, allowing the compressed gas inside the straight-through air pressure cylinder 7 and the telescopic outer sleeve 8 to be delivered through the air inlet cylinder 6 to the inside of the nutrient solution hanging bag 1. This achieves the effect of adjusting the pressure of the nutrient solution drip tank at any time according to usage needs, making the nutrient solution drip irrigation smoother and more efficient.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drip irrigation device for nutrient solution in seedlings, comprising a nutrient solution hanging bag (1), characterized in that: The bottom of the nutrient solution hanging bag (1) is fixedly inserted with a connecting cap tube (2), the bottom of which is inserted into the inside of the outer cap tube (3). The surface of the connecting cap tube (2) is threadedly connected to the inner wall of the outer cap tube (3). The bottom of the outer cap tube (3) is connected to a drip irrigation hose (4), the surface of which is fitted with a flow regulator and the end is connected to a drip nozzle. The top of the nutrient solution hanging bag (1) is provided with a hanging rope (5), and an air inlet tube (6) and a liquid inlet tube are fixedly inserted into the surface of the nutrient solution hanging bag (1). (10) A straight-through air cylinder (7) is provided at the top of the air inlet cylinder (6). A threaded groove is provided on the outer surface of the straight-through air cylinder (7). The top of the straight-through air cylinder (7) is inserted into the interior of the telescopic outer sleeve (8). A rotary bottom sleeve (9) is threadedly sleeved on the surface of the straight-through air cylinder (7). The top of the rotary bottom sleeve (9) is rotatably connected to the bottom end of the telescopic outer sleeve (8). The top of the liquid inlet cylinder (10) is inserted into the interior of the sealing cylinder (11). The surface of the liquid inlet cylinder (10) is threadedly sleeved with the inner wall of the sealing cylinder (11).

2. The seedling nutrient solution drip irrigation device according to claim 1, characterized in that: A push-threaded cylinder (12) is inserted into the top of the telescopic outer sleeve (8). The surface of the push-threaded cylinder (12) is threadedly connected to the inner wall of the top plate of the telescopic outer sleeve (8). A rotating cap cylinder (13) is fixedly installed on the top of the push-threaded cylinder (12). A first push plate (14) is rotatably connected to one end of the push-threaded cylinder (12) located inside the telescopic outer sleeve (8). An upper sealing cylinder (15) is fixedly sleeved on the surface of the first push plate (14). The upper sealing cylinder (15) is pressed against the inner wall of the telescopic outer sleeve (8). Two vertical hanging rods (16) slide through the surface of the first push plate (14). The tops of the two vertical hanging rods (16) are fixedly connected to the inner wall of the telescopic outer sleeve (8). The bottoms of the two vertical hanging rods (16) are fixedly connected to the top surface of the second push plate (17). A lower sealing cylinder (18) is fixedly sleeved on the surface of the second push plate (17).

3. The seedling nutrient solution drip irrigation device according to claim 1, characterized in that: An inner support plate (20) is fixedly installed on the inner wall of the air intake cylinder (6). A push-blocking plate (21) is installed above the inner support plate (20). A sealing push-support block (22) is fixedly installed on the top of the push-blocking plate (21). The top of the sealing push-support block (22) is inserted into the opening on the top surface of the air intake cylinder (6). Two return springs (23) are fixedly installed on the bottom surface of the push-blocking plate (21). The other end of the two return springs (23) is fixedly connected to the top surface of the inner support plate (20). Push sleeves (24) are fixedly installed on both sides of the push-blocking plate (21). The inner ring of the push sleeve (24) is slidably sleeved with the surface of the vertical slide rod (25). The two ends of the vertical slide rod (25) are fixedly connected to the top surface of the inner support plate (20) and the inner wall of the air intake cylinder (6), respectively. A limiting ring (26) is fixedly sleeved on the surface of the vertical slide rod (25).

4. The seedling nutrient solution drip irrigation device according to claim 2, characterized in that: An air inlet nozzle (27) is fixedly inserted into the left side of the telescopic outer sleeve (8). The left end of the air inlet nozzle (27) is inserted into the inside of the nozzle cap button (28). The inner wall of the nozzle cap button (28) is threadedly connected to the surface of the air inlet nozzle (27). A sealing gasket plate is fixedly provided on the inner wall of the nozzle cap button (28).

5. A drip irrigation device for seedling nutrient solution according to claim 2, characterized in that: The outer diameter of the lower sealing cylinder (18) is the same as the inner diameter of the straight-through air pressure cylinder (7). A sealing docking cylinder (19) is fixedly provided at the top edge of the straight-through air pressure cylinder (7). The annular outer surface of the sealing docking cylinder (19) is in contact with the inner wall of the telescopic outer sleeve (8). The inner wall of the sealing docking cylinder (19) is set in a conical shape.

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