Buried telescopic rod

Abstract

The utility model provides a buried telescopic rod which comprises a bottom pipe, a first telescopic pipe, a second telescopic pipe, a flexible clamping ring and a locking sleeve, the bottom pipe is buried underground and arranged in the vertical direction, and the lower end of the bottom pipe is used for being connected with a water supply pipe; the first telescopic pipe is slidably connected into the bottom pipe. The second telescopic pipe is slidably connected into the first telescopic pipe; the flexible clamping ring is arranged on the periphery of the second telescopic pipe in a sleeving mode and located above the first telescopic pipe, and a notch is formed in the peripheral wall of the flexible clamping ring; the periphery of the flexible clamping ring is sleeved with the locking sleeve, the locking sleeve is in threaded connection with the first telescopic pipe, and the locking sleeve gradually gathers towards the center shaft from bottom to top; the locking sleeve can rotationally move downwards and extrude the flexible clamping ring to tightly hold the periphery of the second telescopic pipe so as to lock the position of the second telescopic pipe. According to the buried telescopic rod provided by the utility model, the irrigation height can be adjusted by adjusting the height of the second telescopic pipe so as to meet the irrigation requirements of different heights.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy and irrigation technology, and more specifically, it relates to an underground telescopic pole. Background Technology

[0002] The buried telescopic pole is a new type of farmland irrigation equipment that uses water power to automatically extend and retract. The buried telescopic pole is connected to the water supply pipe and includes multiple telescopic pipe sections and a sprinkler head. When in use, irrigation water enters the telescopic pipes and sprinkler head sequentially. Under the action of water pressure, the telescopic pipes drive the sprinkler head to rise above the ground (each telescopic pipe extends to its limit position) for sprinkler irrigation.

[0003] However, different crop types, growth cycles, and soil conditions have different requirements for irrigation height, and existing underground telescopic poles cannot meet the needs of irrigation at different heights. Utility Model Content

[0004] This utility model provides an underground telescopic pole that can adjust the irrigation height by adjusting the height of the second telescopic pipe to meet irrigation needs at different heights.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A buried telescopic pole is provided, comprising a base pipe, a first telescopic pipe, a second telescopic pipe, a flexible retaining ring, and a locking sleeve. The base pipe is buried underground and arranged vertically, with its lower end connected to a water supply pipe. The first telescopic pipe is slidably connected inside the base pipe; the second telescopic pipe is slidably connected inside the first telescopic pipe; the flexible retaining ring is sleeved on the outer periphery of the second telescopic pipe and located above the first telescopic pipe, with a notch on its outer peripheral wall; the locking sleeve is sleeved on the outer periphery of the flexible retaining ring and threadedly connected to the first telescopic pipe, the locking sleeve gradually converging towards the central axis from bottom to top; wherein, the locking sleeve can rotate downwards and squeeze the flexible retaining ring to tightly grip the outer periphery of the second telescopic pipe to lock the axial relative position of the second telescopic pipe and the first telescopic pipe.

[0006] In one possible implementation, the inner circumferential wall of the first telescopic tube is provided with a mounting platform that protrudes inward, and the top of the mounting platform is provided with a sealing ring that is fitted onto the outer circumference of the second telescopic tube.

[0007] In some embodiments, the outer periphery of the second telescopic tube is slidably fitted with a top sleeve located above the sealing ring. The lower end of the top sleeve is used to abut against the top of the sealing ring, and the upper end extends above the first telescopic tube and is used to abut against the lower end face of the flexible retaining ring.

[0008] In some embodiments, a first limiting platform protruding outward is provided on the outer peripheral wall of the top sleeve. The first limiting platform is located near the upper end of the top sleeve and abuts against the upper end face of the first telescopic tube.

[0009] In one possible implementation, the inner peripheral wall of the flexible clasp is provided with downwardly inclined teeth.

[0010] In one possible implementation, a sealing ring is provided between the first telescopic tube and the bottom tube.

[0011] In some embodiments, a fixing sleeve is threaded onto the outer peripheral wall of the upper end of the bottom tube, and a fixing platform is provided on the outer peripheral wall of the sealing ring, which protrudes outward and is located between the fixing sleeve and the bottom tube.

[0012] In some embodiments, a mating platform protruding outward is provided on the lower outer peripheral wall of the first telescopic tube, and the cross-sectional area of ​​the mating platform gradually decreases from bottom to top.

[0013] In some embodiments, the upper end of the first telescopic tube is provided with a nozzle for threadedly sleeved on the outer periphery of the first telescopic tube; wherein, the first telescopic tube has a retracted state and an extended state. When in the retracted state, the second telescopic tube is separated from the first telescopic tube, and the nozzle is threadedly sleeved on the upper outer periphery of the first telescopic tube; when in the extended state, the second telescopic tube is inserted into the first telescopic tube, and a locking sleeve is threadedly sleeved on the upper outer periphery of the first telescopic tube.

[0014] In one possible implementation, the lower end of the bottom pipe is threaded with a tee fitting for connection to the water supply pipe.

[0015] Compared with existing technologies, the underground telescopic pole provided in this embodiment involves irrigation water entering the base pipe, the first telescopic pipe, and the second telescopic pipe sequentially. Under water pressure, the first telescopic pipe extends from the base pipe, and the irrigation water sprays out from the nozzles. When adjusting the irrigation height, the water supply is first stopped, the locking sleeve is loosened, and the flexible retaining ring is released from the second telescopic pipe (the opening gradually widens). Then, according to the required irrigation height, the length of the second telescopic pipe extending beyond the first telescopic pipe is adjusted. After adjustment, the locking sleeve is tightened to compress the flexible retaining ring and hold it tightly around the outer circumference of the second telescopic pipe (the opening gradually narrows), thereby locking the axial relative position of the second and first telescopic pipes. The irrigation height is adjusted by adjusting the height of the second telescopic pipe to meet different irrigation needs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the underground telescopic rod in its extended state, provided for an embodiment of this utility model;

[0018] Figure 2 A front sectional view of the underground telescopic rod in its extended state, provided in an embodiment of this utility model.

[0019] Figure 3 This is an embodiment of the present utility model. Figure 2 A magnified schematic diagram of the local structure at point I;

[0020] Figure 4 This is an embodiment of the present utility model. Figure 2 A magnified schematic diagram of the local structure at point II;

[0021] Figure 5 A schematic diagram of the underground telescopic rod in the retracted state provided in this embodiment of the utility model (disassembling the second telescopic tube, flexible retaining ring, top sleeve, sealing ring and locking sleeve, and installing the nozzle);

[0022] Figure 6 A front sectional view of the underground telescopic pole in the retracted state provided in this embodiment of the utility model (disassembling the second telescopic tube, flexible retaining ring, top sleeve, sealing ring and locking sleeve, and installing the nozzle);

[0023] Figure 7 This is an embodiment of the present utility model. Figure 3 A schematic diagram of the structure of a flexible retaining ring.

[0024] The following are the labeling elements in the figure:

[0025] 10. Bottom pipe; 11. T-joint; 20. First telescopic pipe; 21. Mounting platform; 22. Sealing ring; 23. Mating platform; 30. Second telescopic pipe; 40. Flexible retaining ring; 41. Notch; 42. Tooth; 43. Second limiting platform; 44. Pressure strip; 50. Locking sleeve; 51. Annular groove; 60. Top sleeve; 61. First limiting platform; 62. Boss; 70. Sealing ring; 71. Fixing platform; 80. Fixing sleeve; 90. Nozzle. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.

[0028] The buried telescopic pole is a new type of farmland irrigation equipment that uses water power to automatically extend and retract. The buried telescopic pole is connected to the water supply pipe and includes multiple telescopic pipe sections and a sprinkler head. When in use, irrigation water enters the telescopic pipes and sprinkler head sequentially. Under the action of water pressure, the telescopic pipes drive the sprinkler head to rise above the ground (each telescopic pipe extends to its limit position) for sprinkler irrigation.

[0029] However, different crop types, growth cycles, and soil conditions have different requirements for irrigation height, and existing underground telescopic poles cannot meet the needs of irrigation at different heights.

[0030] Please see Figures 1 to 7 The following describes the underground telescopic pole provided by this utility model. The underground telescopic pole includes a base pipe 10, a first telescopic pipe 20, a second telescopic pipe 30, a flexible retaining ring 40, and a locking sleeve 50. The base pipe 10 is buried underground and arranged vertically, with its lower end connected to a water supply pipe. The first telescopic pipe 20 is slidably connected inside the base pipe 10; the second telescopic pipe 30 is slidably connected inside the first telescopic pipe 20; the flexible retaining ring 40 is sleeved on the outer periphery of the second telescopic pipe 30 and located above the first telescopic pipe 20, with a notch 41 on its outer peripheral wall; the locking sleeve 50 is sleeved on the outer periphery of the flexible retaining ring 40 and threadedly connected to the first telescopic pipe 20, with the locking sleeve 50 gradually converging towards the central axis from bottom to top; wherein, the locking sleeve 50 can rotate downwards and squeeze the flexible retaining ring 40 to tightly grip the outer periphery of the second telescopic pipe 30 to lock the axial relative position of the second telescopic pipe 30 and the first telescopic pipe 20.

[0031] Furthermore, the water supply pipe is connected to the bottom pipe 10, the bottom pipe 10 is connected to the first telescopic pipe 20, and the second telescopic pipe 30 is connected to the first telescopic pipe 20.

[0032] Furthermore, the upper end of the second telescopic tube 30 is provided with a water spray hole.

[0033] Furthermore, the notch 41 of the flexible retaining ring 40 allows it to stretch into a long strip under the action of external force applied by hand.

[0034] This application provides an underground telescopic pole. In actual use, the base pipe 10 is buried below the ground surface, and a water supply pipe supplies water. Irrigation water enters the base pipe 10, the first telescopic pipe 20, and the second telescopic pipe 30 sequentially. Under water pressure, the first telescopic pipe 20 extends out of the base pipe 10, and the irrigation water sprays out from the spray nozzle. When it is necessary to adjust the irrigation height, first stop the water supply, loosen the locking sleeve 50, and let the flexible retaining ring 40 loosen the second telescopic pipe 30 (the notch 41 gradually widens). Then, according to the required irrigation height, adjust the length of the second telescopic pipe 30 extending out of the first telescopic pipe 20. After adjustment, tighten the locking sleeve 50 to squeeze the flexible retaining ring 40 to hold the outer periphery of the second telescopic pipe 30 (the notch 41 gradually narrows), thereby locking the axial relative position of the second telescopic pipe 30 and the first telescopic pipe 20. The irrigation height is adjusted by adjusting the height of the second telescopic pipe 30 to meet the irrigation needs at different heights.

[0035] Compared with the prior art, the underground telescopic pole provided in this embodiment allows irrigation water to enter the base pipe 10, the first telescopic pipe 20, and the second telescopic pipe 30 sequentially. Under water pressure, the first telescopic pipe 20 extends out of the base pipe 10, and the irrigation water sprays out from the spray nozzle. When it is necessary to adjust the irrigation height, first stop the water supply, loosen the locking sleeve 50, and let the flexible retaining ring 40 loosen the second telescopic pipe 30 (the notch 41 gradually widens). Then, according to the required irrigation height, adjust the length of the second telescopic pipe 30 extending out of the first telescopic pipe 20. After adjustment, tighten the locking sleeve 50 to squeeze the flexible retaining ring 40 to hug the outer periphery of the second telescopic pipe 30 (the notch 41 gradually narrows), thereby locking the axial relative position of the second telescopic pipe 30 and the first telescopic pipe 20. The irrigation height can be adjusted by adjusting the height of the second telescopic pipe 30 to meet the irrigation needs at different heights.

[0036] In one possible implementation, the aforementioned first telescopic tube 20 adopts as follows: Figure 2 and Figure 3 The structure shown is described in the following document. Figure 2 and Figure 3 The inner circumferential wall of the first telescopic tube 20 is provided with a mounting platform 21 that protrudes inward, and the top of the mounting platform 21 is provided with a sealing ring 22 that is fitted onto the outer circumference of the second telescopic tube 30.

[0037] Specifically, an mounting platform 21 is provided on the inner wall of the first telescopic pipe 20, and a sealing ring 22 is installed thereon, which solves the water leakage problem between the first telescopic pipe 20 and the second telescopic pipe 30. The sealing ring 22 is located between the first telescopic pipe 20 and the second telescopic pipe 30, forming an annular sealing surface to prevent water from leaking through the gap between the two pipes, thus avoiding water waste and soil erosion. Furthermore, the sealing ring 22 can be replaced independently without disassembling the entire buried telescopic rod structure, reducing maintenance costs.

[0038] In some embodiments, see Figure 2 and Figure 3 The outer periphery of the second telescopic tube 30 is provided with a top sleeve 60 located above the sealing ring 22. The lower end of the top sleeve 60 is used to abut against the top of the sealing ring 22, and the upper end extends to the top of the first telescopic tube 20 and is used to abut against the lower end face of the flexible retaining ring 40.

[0039] Specifically, a sliding top sleeve 60 is added above the sealing ring 22, serving both sealing protection and pressure transmission functions. The top sleeve 60 isolates the second telescopic tube 30 from direct sliding contact with the sealing ring 22, preventing long-term friction between the tube wall and the sealing ring 22 from causing wear or tear. The top sleeve 60 transmits the axial pressure of the locking sleeve 50 on the flexible retaining ring 40 downwards to the sealing ring 22, enhancing the compression and fit of the sealing ring 22 and further improving leak-proof performance. The upper and lower ends of the top sleeve 60 contact the flexible retaining ring 40 and the sealing ring 22 respectively, providing a locking and sealing effect.

[0040] Furthermore, the lower outer peripheral wall of the top sleeve 60 has a protrusion 62 that protrudes outward, and the protrusion 62 contacts and engages with the inner peripheral wall of the first telescopic tube 20 to limit the shaking of the top sleeve 60 within the first telescopic tube 20.

[0041] In some embodiments, see Figure 2 and Figure 3 The outer peripheral wall of the top sleeve 60 is provided with a first limiting platform 61 that protrudes outward. The first limiting platform 61 is located near the upper end of the top sleeve 60 and abuts against the upper end surface of the first telescopic tube 20.

[0042] Specifically, the axial travel of the top sleeve 60 is controlled by the first limiting platform 61 on the outer wall of the top sleeve 60 engaging with the upper end face of the first telescopic tube 20. Furthermore, the first limiting platform 61 increases the contact area with the lower end face of the flexible retaining ring 40, thereby improving the contact area between the flexible retaining ring 40 and the top sleeve 60.

[0043] Furthermore, the inner peripheral wall of the locking sleeve 50 is provided with an annular groove 51 extending downward to the lower opening of the locking sleeve 50, and the lower outer peripheral wall of the flexible retaining ring 40 is provided with a second limiting platform 43 protruding outward. The second limiting platform 43 is located below the bottom wall of the annular groove 51 and is used to press the second limiting platform 43 down onto the first limiting platform 61.

[0044] Furthermore, the upper inner peripheral wall of the locking sleeve 50 gradually converges towards the central axis from bottom to top, and the outer peripheral wall of the flexible retaining ring 40 gradually converges towards the central axis from bottom to top.

[0045] Furthermore, the outer peripheral wall of the flexible retaining ring 40 is provided with a pressure strip 44 extending in the inclined direction of the outer peripheral wall of the flexible retaining ring 40, which is used to abut against the upper inner peripheral wall of the locking sleeve 50. This not only reduces the contact area between the flexible retaining ring 40 and the locking sleeve 50 and ensures the smooth rotation of the locking sleeve 50, but also ensures that the flexible retaining ring 40 is squeezed and held tightly against the outer peripheral wall of the second telescopic tube 30 during the rotation and tightening process of the locking sleeve 50.

[0046] In one possible implementation, the aforementioned flexible retaining ring 40 adopts, as follows: Figure 2 , Figure 3 and Figure 7 The structure shown is described in the following document. Figure 2 , Figure 3 and Figure 7 The flexible retaining ring 40 has downwardly inclined teeth 42 on its inner peripheral wall.

[0047] Specifically, the inner wall of the flexible retaining ring 40 is provided with downwardly inclined teeth 42 to enhance the locking effect on the second telescopic tube 30. The inclination direction of the teeth 42 is opposite to the extension direction of the second telescopic tube 30, forming a "ratchet effect." When an external force attempts to pull the second telescopic tube 30 upward, the teeth 42 will embed deeper into the tube wall to prevent slippage. The teeth 42 can penetrate into tiny depressions or coatings on the surface of the second telescopic tube 30, maintaining effective grip even if the tube wall has slight rust or dirt.

[0048] Furthermore, the teeth 42 are spaced apart along the axial direction of the flexible retaining ring 40.

[0049] In one possible implementation, the aforementioned first telescopic tube 20 adopts as follows: Figure 2 , Figure 4 and Figure 6 The structure shown is described in the following document. Figure 2 , Figure 4 and Figure 6 A sealing ring 70 is provided between the first telescopic tube 20 and the bottom tube 10.

[0050] Specifically, the sealing ring 70 only comes into contact with the first telescopic tube 20 on the part near the upper and lower end faces. That is, the contact area between the sealing ring 70 and the first telescopic tube 20 is small. This can ensure the sealing between the first telescopic tube 20 and the bottom tube 10, while also reducing the friction between the first telescopic tube 20 and the bottom tube 10, so as to facilitate the smooth lifting and lowering of the first telescopic tube 20.

[0051] In some embodiments, see Figure 2 , Figure 4 and Figure 6 A fixing sleeve 80 is threaded on the outer peripheral wall of the upper end of the bottom tube 10, and a fixing platform 71 is provided on the outer peripheral wall of the sealing ring 70, which protrudes outward and is located between the fixing sleeve 80 and the bottom tube 10.

[0052] Specifically, the tightening force of the sealing ring 70 can be flexibly adjusted by the engagement of the threaded retaining sleeve 80 with the fixing platform 71 of the sealing ring 70. As the sealing ring 70 ages or wears after long-term use, the tightening force can be reapplied by tightening the retaining sleeve 80 to restore the sealing effect, without the need for immediate replacement of the seal. The self-locking characteristic of the threaded retaining sleeve 80 ensures that the sealing ring 70 will not loosen in a vibrating environment, maintaining a constant sealing pressure. The retaining sleeve 80 is threadedly connected to the base tube 10, facilitating disassembly for cleaning or replacement of the sealing ring 70.

[0053] In some embodiments, see Figure 2 , Figure 4 and Figure 6 The lower outer peripheral wall of the first telescopic tube 20 is provided with a mating platform 23 that protrudes outward, and the cross-sectional area of ​​the mating platform 23 gradually decreases from bottom to top.

[0054] Specifically, the tapered structure gradually increases the contact area between the first telescopic tube 20 and the sealing ring 70 during its ascent, thereby enhancing the sealing performance. When the first telescopic tube 20 retracts into the bottom tube 10, the tapered mating platform 23 guides it axially downward into the bottom tube 10, preventing it from deviating or getting stuck.

[0055] In some embodiments, see Figures 1 to 3 , Figure 5 and Figure 6 The upper end of the first telescopic tube 20 is provided with a nozzle 90 for threadedly sleeved on the outer periphery of the first telescopic tube 20; wherein, the first telescopic tube 20 has a retracted state and an extended state. When it is in the retracted state, the second telescopic tube 30 is separated from the first telescopic tube 20, and the nozzle 90 is threadedly sleeved on the upper outer periphery of the first telescopic tube 20; when it is in the extended state, the second telescopic tube 30 is inserted into the first telescopic tube 20, and the locking sleeve 50 is threadedly sleeved on the upper outer periphery of the first telescopic tube 20.

[0056] Specifically, the interchangeable design of the nozzle 90 and the locking sleeve 50 enables both functional expansion and storage protection. When not in use, the nozzle 90 acts as a protective cap, covering the upper end of the first telescopic tube 20 to prevent foreign objects from entering the tube cavity or causing corrosion of the threaded interface.

[0057] After irrigation is completed, stop the water supply through the pipeline, disassemble the second telescopic pipe 30, replace it with the sprinkler head 90, and press down the sprinkler head 90 to push the first telescopic pipe 20 into the bottom pipe 10, so that the whole thing goes underground, making it convenient for the land to be tilled.

[0058] When irrigation is needed, water is supplied. Under the action of water pressure, the first telescopic pipe 20 extends out of the bottom pipe 10 (ground). Irrigation water is sprayed out from the nozzle 90 to wet the ground soil. When water supply is stopped, the nozzle 90 is disassembled, and the second telescopic pipe 30, flexible retaining ring 40, top sleeve 60, sealing ring 22 and locking sleeve 50 are installed. The second telescopic pipe 30 is then in a suitable extended state, and the locking sleeve 50 is tightened to fix the axial length of the second telescopic pipe 30 relative to the first telescopic pipe 20.

[0059] In one possible implementation, the bottom tube 10 is adopted as follows: Figure 1 , Figure 2 , Figure 5 and Figure 6 The structure shown is described in the following document. Figure 1 , Figure 2 , Figure 5 and Figure 6 The lower end of the bottom pipe 10 is threaded with a tee connector 11, which is used to connect to the water supply pipe.

[0060] Specifically, the tee connector 11 is threaded onto the lower outer circumference of the base pipe 10. The tee connector 11 can simultaneously connect the main water supply pipe and other branch pipes (such as the base pipe 10 of another buried telescopic pole), improving the flexibility of the irrigation system.

[0061] Furthermore, a silicone ring is provided between the tee connector 11 and the bottom tube 10 for sealing.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An underground telescopic pole, characterized in that, include: The bottom pipe is buried underground and installed in the vertical direction. The lower end of the bottom pipe is used to connect to the water supply pipe. The first telescopic tube is slidably connected inside the bottom tube; The second telescopic tube is slidably connected inside the first telescopic tube; A flexible retaining ring is sleeved on the outer periphery of the second telescopic tube and located above the first telescopic tube. The outer peripheral wall of the flexible retaining ring has a notch. as well as A locking sleeve is fitted around the outer periphery of the flexible retaining ring and threadedly connected to the first telescopic pipe. The locking sleeve gradually converges towards the central axis from bottom to top. The locking sleeve can rotate downward and squeeze the flexible retaining ring to hold the outer periphery of the second telescopic tube to lock the axial relative position of the second telescopic tube and the first telescopic tube.

2. The underground telescopic pole as described in claim 1, characterized in that, The inner circumferential wall of the first telescopic tube is provided with a mounting platform that protrudes inward, and the top of the mounting platform is provided with a sealing ring that is fitted onto the outer circumference of the second telescopic tube.

3. The underground telescopic pole as described in claim 2, characterized in that, The outer periphery of the second telescopic tube is fitted with a top sleeve located above the sealing ring. The lower end of the top sleeve is used to abut against the top of the sealing ring, and the upper end extends above the first telescopic tube and is used to abut against the lower end face of the flexible retaining ring.

4. The underground telescopic pole as described in claim 3, characterized in that, The outer peripheral wall of the top sleeve is provided with a first limiting platform that protrudes outward. The first limiting platform is located near the upper end of the top sleeve and abuts against the upper end face of the first telescopic tube.

5. The underground telescopic pole as described in claim 1, characterized in that, The flexible retaining ring has downwardly inclined teeth on its inner peripheral wall.

6. The underground telescopic pole as described in claim 1, characterized in that, A sealing ring is provided between the first telescopic tube and the bottom tube.

7. The underground telescopic pole as described in claim 6, characterized in that, A fixing sleeve is threaded onto the outer peripheral wall of the upper end of the bottom tube, and a fixing platform is provided on the outer peripheral wall of the sealing ring, which protrudes outward and is located between the fixing sleeve and the bottom tube.

8. The underground telescopic pole as described in claim 7, characterized in that, The lower outer peripheral wall of the first telescopic tube is provided with a mating platform that protrudes outward, and the cross-sectional area of ​​the mating platform gradually decreases from bottom to top.

9. The underground telescopic pole as described in claim 1, characterized in that, The upper end of the first telescopic tube is provided with a nozzle for threading onto the outer periphery of the first telescopic tube; The first telescopic tube has a retracted state (tucked into the bottom tube) and an extended state (extended from the bottom tube). In the retracted state, the second telescopic tube is separated from the first telescopic tube, and the nozzle is threadedly sleeved on the upper outer periphery of the first telescopic tube. In the extended state, the second telescopic tube is inserted into the first telescopic tube, and the locking sleeve is threadedly sleeved on the upper outer periphery of the first telescopic tube.

10. The underground telescopic pole as described in claim 1, characterized in that, The lower end of the bottom pipe is threaded with a tee connector, which is used to connect to the water supply pipe.

Images