Ground inserting sprinkling irrigation device
By designing a ground-mounted sprinkler system with a sliding connecting pipe and clamping claws, the limitations of nozzle height adjustment and water pipe connection are solved, enabling flexible sprinkler height adjustment and convenient water pipe connection, thus improving the user experience.
Patent Information
- Application Number
- CN202423100186.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing ground-mounted sprinkler systems have limitations in terms of nozzle height adjustment. Users cannot easily and quickly adjust the nozzle height according to actual needs, and they are difficult to adapt to water pipe connections of different sizes, which affects the user experience.
A ground-mounted sprinkler irrigation device was designed, including a ground-mounted pole, a connecting pipe, and clamping claws. The connecting pipe can be slidably installed on the ground-mounted pole. By setting elastic claw buckles and clamping claws at both ends of the connecting pipe, the water pipe and the sprinkler head can be detached and their height can be adjusted.
It enables flexible adjustment of sprinkler height and convenient connection of water pipes of different sizes, improving the user experience and applicability of the equipment.
Smart Images
Figure CN223568301U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of gardening irrigation facilities, especially relates to a ground insertion sprinkling irrigation device. BACKGROUND
[0002] The ground insertion sprinkling irrigation is an irrigation mode widely used in the fields of agriculture, gardening, greening and lawn, etc., and its main feature is that the spray head is supported by a support rod, the support rod is generally inserted into the soil to ensure that the spray head is kept at an appropriate height, and irrigation is carried out through water jet, compared with other irrigation modes (such as drip irrigation, micro-sprinkling irrigation, etc.), the ground insertion sprinkling irrigation has obvious advantages in the irrigation of large-area land or lawn, however, the existing ground insertion sprinkling irrigation equipment has certain limitations in the height adjustment of the spray head, the user cannot conveniently and quickly adjust the height of the spray head according to the actual demand, and the existing ground insertion sprinkling irrigation equipment is difficult to adapt to the connection of water pipes with different sizes, which affects the use experience and is difficult to meet the demand of different scenes. SUMMARY
[0003] The utility model aims at providing a ground insertion sprinkling irrigation device, and aims at solving at least one of the technical problems in the prior art.
[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model provides a ground insertion sprinkling irrigation device, which comprises:
[0005] A ground insertion rod;
[0006] A communication pipe body, which is slidably installed on the ground insertion rod, the inside of the communication pipe body is hollow to form a water conveying cavity in the communication pipe body, and both ends of the communication pipe body are open to respectively provide elastic claw buckles at both end openings of the communication pipe body, so that a water pipe or a spray head is respectively detachably installed at both ends of the communication pipe body through the elastic claw buckles.
[0007] A clamping claw, which is arranged on the outer peripheral surface of the communication pipe body, and the cross-sectional shape of the clamping claw is C-shaped, so that the communication pipe body is slidably installed on the ground insertion rod through the clamping claw.
[0008] Further, the central axis of the communication pipe body is arranged in parallel with the central axis of the clamping claw, and the central axis of the communication pipe body is arranged in parallel with the length direction of the ground insertion rod.
[0009] Further, the communication pipe body is provided with an elastic sealing element, the outer peripheral surface of the elastic sealing element abuts against the inner wall of the water conveying cavity, and the end of the elastic claw buckle abuts against the elastic sealing element.
[0010] Further, the inner wall of the opening at both ends of the communicating pipe body protrudes radially to form a limiting platform, and the end of the elastic claw buckle protrudes outward to be provided with a limiting protrusion.
[0011] Further, the elastic claw buckle comprises:
[0012] an abutting ring, one end of the abutting ring being provided with an abutting plane;
[0013] a plurality of elastic pipe walls, the plurality of elastic pipe walls being arranged on the abutting plane in a circumferential direction;
[0014] a plurality of metal sheets, the plurality of metal sheets being embedded in the inner circumferential surface of the plurality of elastic pipe walls one by one;
[0015] wherein the limiting protrusion has a plurality of limiting protrusions, the plurality of limiting protrusions being installed on the outer circumferential surface of the plurality of elastic pipe walls one by one, and the limiting platform is located between the abutting ring and the limiting protrusion.
[0016] Further, the axial length of the elastic pipe wall is greater than the axial length of the limiting platform, so that the end of the elastic pipe wall can be elastically deformed when the abutting plane abuts against the outer end surface of the limiting platform.
[0017] Further, the outer wall of the elastic pipe wall is attached to the inner wall of the limiting platform, so that the outer wall of the elastic pipe wall and the inner hole of the limiting platform are slidably connected.
[0018] Further, the outer circumferential surface of the communicating pipe body protrudes outward to extend to form an extension arm, the clamping claw is installed at the end of the extension arm, and the clamping claw, the extension arm and the communicating pipe body are integrally formed.
[0019] Further, one side of the clamping claw is provided with a slot, so that the clamping claw is divided into two oppositely arranged clamping walls through the slot, and the two clamping walls of the clamping claw are both arc-shaped pipe wall portions, so that the ground insertion rod is clamped between the two clamping walls through the opening of the clamping claw, and the clamping claw can slide in the length direction of the ground insertion rod.
[0020] Further, the side of the clamping claw away from the slot is connected with the extension arm, and the extension plane where the extension arm is located is arranged in parallel with the central axis of the communicating pipe body.
[0021] From the above technical scheme can be seen, the ground insertion sprinkling irrigation device of the utility model, can be seen, the ground insertion sprinkling irrigation device of the utility model, through the clamping claw set on the communicating pipe body, and the section of clamping claw is designed as C character, to make the communicating pipe body can be slidably installed to the ground insertion rod through the clamping claw, when the user manually slides the communicating pipe body, the communicating pipe body can slide along the axis direction of the ground insertion rod, wherein the communicating pipe body is used for connecting the water pipe and the spray head, specifically, by setting the opening at both ends of the communicating pipe body, and setting the elastic claw buckle at the opening, the water pipe and the spray head are inserted into the opening at both ends of the communicating pipe body respectively, the elastic claw buckle will limit the water pipe or the spray head, to adjust the sprinkling irrigation height by sliding along the axis direction of the ground insertion rod through the communicating pipe body.
[0022] In order to make the technical concept and other purposes, advantages, features and effects of the utility model more clear and easy to understand, the preferred embodiments will be described in the following specific embodiments, and the detailed description will be made in the following specific embodiments, and the detailed description will be made in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creating labor.
[0024] Figure 1 It is a perspective view of the ground insertion sprinkling irrigation device provided by the embodiment of the application.
[0025] Figure 2 It is a structure exploded view of the ground insertion sprinkling irrigation device provided by the embodiment of the application.
[0026] Figure 3 It is a top view of part of the structure provided by the embodiment of the application.
[0027] Figure 4 It is a sectional view of part of the structure provided by the embodiment of the application.
[0028] Among them, the above drawings include the following reference signs:
[0029] 100, ground insertion rod; 200, communicating pipe body; 210, water conveying cavity; 220, elastic claw buckle; 221, abutting ring; 221a, abutting plane; 222, elastic pipe wall; 223, limiting protrusion; 224, metal sheet; 230, elastic sealing element; 240, limiting table; 250, extension arm; 300, clamping claw; 310, slot; 320, clamping wall. DETAILED DESCRIPTION
[0030] In order to make the technical personnel better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the technical personnel in the art without creative labor belong to the scope of protection of the present application.
[0031] Please refer to FIG. 1 to Figure 4 The embodiment provides a ground insertion sprinkling irrigation device, which comprises a ground insertion rod 100, a communication pipe body 200 and a clamping claw 300. The communication pipe body 200 is slidably installed on the ground insertion rod 100. The inside of the communication pipe body 200 is hollow to form a water conveying cavity 210 in the communication pipe body 200. The two ends of the communication pipe body 200 are both open to be provided with elastic claw buckles 220 at the two end openings of the communication pipe body 200 respectively, so that a water pipe or a sprinkler head can be detachably installed on the two ends of the communication pipe body 200 through the elastic claw buckles 220. The clamping claw 300 is arranged on the outer circumferential surface of the communication pipe body 200. The cross-sectional shape of the clamping claw 300 is C-shaped, so that the communication pipe body 200 can be slidably installed on the ground insertion rod 100 through the clamping claw 300.
[0032] It can be seen that the ground insertion sprinkling irrigation device of the present application is provided with the clamping claw 300 on the communication pipe body 200. The cross-sectional shape of the clamping claw 300 is C-shaped, so that the communication pipe body 200 can be slidably installed on the ground insertion rod 100 through the clamping claw 300. When the user manually slides the communication pipe body 200, the communication pipe body 200 can slide along the axial direction of the ground insertion rod 100. The communication pipe body 200 is used to connect the water pipe and the sprinkler head. Specifically, the water pipe and the sprinkler head are respectively inserted into the openings at the two ends of the communication pipe body 200 by setting the openings at the two ends of the communication pipe body 200 and arranging the elastic claw buckles 220 at the openings. The elastic claw buckles 220 limit the water pipe or the sprinkler head, so that the sprinkling irrigation height can be adjusted by sliding the communication pipe body 200 along the axial direction of the ground insertion rod 100.
[0033] The communication pipe body 200 comprises a pipe body and a cap. The outer wall of the two ends of the pipe body is provided with a first annular step. The number of the caps is two. The two caps are respectively installed at the two ends of the pipe body. The inner wall of the cap is provided with a second annular step. When the cap is installed on the pipe body, the first annular step and the second annular step are in contact, so that the cap is respectively buckled and installed at the two ends of the pipe body.
[0034] Obviously, the earth plug 100 in the embodiment is a cylinder, and the section of the clamping jaw 300 is C-shaped to effectively clamp the outer circumferential surface of the earth plug 100. In other embodiments, the earth plug 100 can also be other special shapes, and the section of the clamping jaw 300 can be other shapes to effectively clamp the outer circumferential surface of the earth plug 100.
[0035] Further, as shown in Figure 3 , the central axis of the communication pipe body 200 is arranged in parallel with the central axis of the clamping jaw 300, and the central axis of the communication pipe body 200 is arranged in parallel with the length direction of the earth plug 100.
[0036] The two ends of the communication pipe body 200 are respectively connected with a water pipe and a spray head, and the central axis of the communication pipe body 200 is arranged in parallel with the central axis of the clamping jaw 300, so that the water pipe and the spray head do not interfere with the earth plug 100 when the clamping jaw 300 is installed on the earth plug 100. It can be understood that if the central axis of the communication pipe body 200 and the central axis of the clamping jaw 300 are arranged at an angle, the extension line of the water pipe or the spray head will necessarily cross the axis of the earth plug 100, which will cause the installation difficulty to increase and also affect the installation effect; the central axis of the communication pipe body 200 is arranged in parallel with the length direction of the earth plug 100, so that the communication pipe body 200 can more smoothly slide on the earth plug 100, and the height adjustment is more flexible and easy to operate.
[0037] In the embodiment, as shown in Figure 4 , the communication pipe body 200 is provided with an elastic sealing piece 230, the outer circumferential surface of the elastic sealing piece 230 abuts against the inner wall of the water conveying cavity 210, and the end of the elastic jaw buckle 220 abuts against the elastic sealing piece 230.
[0038] The elastic sealing piece 230 is mainly used for sealing, isolation or preventing liquid leakage, has elasticity, can form close contact with the matching surface during installation, and ensures the sealing effect. The elastic sealing piece 230 can effectively improve the sealing performance of the connection between the communication pipe body 200 and the water pipe or the spray head, prevent liquid leakage, and the material of the elastic sealing piece 230 can be nitrile rubber, silicone rubber or fluororubber, etc. This is prior art, and the material of the elastic sealing piece 230 should not be regarded as a limiting factor of the utility model.
[0039] Further, as shown in Figures 1 to 4 , the opening inner wall of the two ends of the communication pipe body 200 protrudes radially to form a limiting table 240, and the end of the elastic jaw buckle 220 protrudes outward to form a limiting protrusion 223.
[0040] Wherein, the limiting table 240 is arranged at the two end openings of the communicating pipe body 200, the limiting table 240 is located at the end of the cap away from the pipe body, the limiting table 240 limits the limiting protrusions 223 in the water conveying cavity 210, the limiting table 240 can effectively limit the moving range of the elastic claw buckle 220, ensures that the elastic claw buckle 220 can keep the correct position when limiting the water pipe or the shower head, prevents unnecessary sliding or falling; the limiting table 240 is formed by extending the inner wall of the communicating pipe body 200 to the axis direction, so the arrangement can enhance the overall structural strength of the communicating pipe body 200, improves its ability to resist external force, so that it is not easy to deform or damage in the long-term use process, the side of the limiting table 240 towards the water conveying cavity 210 is also provided with an annular limiting piece, the inner peripheral surface of the annular limiting piece is provided with a limiting ring, under the action of the limiting ring, the elastic claw buckle 220 is not easy to fall off, and a better limiting effect of the elastic claw buckle 220 is achieved.
[0041] Further, as shown in Figures 2 to 4 The elastic claw buckle 220 includes: an abutting ring 221, a plurality of elastic pipe walls 222 and a plurality of metal sheets 224, one end of the abutting ring 221 is provided with an abutting plane 221a, the plurality of elastic pipe walls 222 are arranged on the abutting plane 221a in a circumferential direction, and the plurality of metal sheets 224 are embedded on the inner peripheral surfaces of the plurality of elastic pipe walls 222 one by one, wherein the limiting protrusions 223 are a plurality of, the plurality of limiting protrusions 223 are installed on the outer peripheral surfaces of the plurality of elastic pipe walls 222 one by one, and the limiting table 240 is located between the abutting ring 221 and the limiting protrusions 223.
[0042] Wherein, the elastic claw buckle 220 is installed at the two end openings of the communicating pipe body 200, the elastic claw buckle 220 can limit and install water pipes or shower heads of different sizes at the two ends of the communicating pipe body 200, users can realize the effect of disassembling or installing the water pipes or the shower heads through the elastic claw buckle 220, the elastic claw buckle 220 can effectively prevent the water pipes or the shower heads from accidentally falling off due to external force, and the metal sheets 224 limit the water pipes or the shower heads to prevent the water pipes or the shower heads from accidentally falling off due to external force; in the possible implementation mode, the ends of the elastic pipe walls 222 shrink to the central axis in the radial direction from the front ends, so that the metal sheets 224 embedded on the inner peripheral surfaces of the plurality of elastic pipe walls 222 can provide better limiting effect on some small size water pipes or shower heads.
[0043] Further, as shown in Figures 2 to 4 The length of the elastic pipe wall 222 is greater than the length of the limiting table 240, and the axial length of the elastic pipe wall 222 is greater than the axial length of the limiting table 240, so that when the abutting plane 221a abuts against the outer end surface of the limiting table 240, the ends of the elastic pipe wall 222 can be elastically deformed.
[0044] When the water pipe or the shower head is installed on the communicating pipe body 200, the ends of the plurality of elastic pipe walls 222 will expand outward due to the spacing of the metal sheet 224, but the elastic pipe walls 222 will press the water pipe or the shower head due to the elastic effect of the elastic pipe walls 222. The metal sheet 224 achieves a good limiting effect on the water pipe or the shower head. The provision of such a design can make the elastic claw buckle 220 adapt to water pipes and shower head interfaces of different sizes or types, ensuring that it has high universality and applicability.
[0045] Further, as shown in Figure 4 , the outer wall of the elastic pipe wall 222 is in close contact with the inner wall of the limiting table 240, so that the outer wall of the elastic pipe wall 222 and the inner hole of the limiting table 240 are slidably connected.
[0046] Wherein, the outer wall of the elastic pipe wall 222 is in close contact with the inner wall of the limiting table 240, which enables the elastic pipe wall 222 and the limiting table 240 to form a close contact, further ensuring the stability and sealing of the connection; in addition, in the possible implementation, when the water pipe or the shower head is installed into the communicating pipe body 200, the axial stretching of the elastic pipe wall 222 can enhance the locking effect of the elastic claw buckle 220 on the water pipe or the shower head. Specifically, when the elastic pipe wall 222 is axially stretched, the end of the elastic pipe wall 222 is contracted under the action of the limiting table 240, which plays a more close locking effect on the water pipe or the shower head.
[0047] Further, as shown in Figures 1 to 4 , the outer circumferential surface of the communicating pipe body 200 extends outward to form an extension arm 250, and the clamping claw 300 is installed at the end of the extension arm 250. The clamping claw 300, the extension arm 250 and the communicating pipe body 200 are integrally formed.
[0048] Wherein, the clamping claw 300 and the water pipe or the shower head on the communicating pipe body 200 are spaced apart by the extension arm 250, so as to reduce the interference between the ground plug rod 100 and the water pipe or the shower head, and enhance the stability and durability of the entire support structure.
[0049] Further, as shown in Figure 1 and Figure 4 , one side of the clamping claw 300 is provided with a slot 310, so as to separate the clamping claw 300 into two oppositely arranged clamping walls 320 through the slot 310. The two clamping walls 320 of the clamping claw 300 are both arc-shaped pipe wall portions, so that the ground plug rod 100 is clamped between the two clamping walls 320 through the opening of the clamping claw 300, and the clamping claw 300 can slide in the length direction of the ground plug rod 100.
[0050] The cross section of the clamping jaw 300 is designed so that the arc-shaped inner wall of the clamping jaw 300 can better fit the outer surface of the ground insertion rod 100, and the clamping jaw 300 can be easily clamped on the ground insertion rod 100 from the side provided with the slot 310 during assembly, avoiding the trouble of complex tools or multiple steps of installation in the traditional connection structure. The clamping wall 320 is made of a material that does not have significant elastic deformation capability, so that the clamping jaw 300 is tightly connected with the support rod under the action of the clamping wall 320. The clamping piece will not slide in the length direction of the support rod under the action of gravity, and the clamping jaw 300 can slide in the length direction of the ground insertion rod 100 when manually adjusted by the user.
[0051] Further, as shown in Figures 1 to 4 The side of the clamping jaw 300 away from the slot 310 is connected with the extension arm 250, and the extension plane of the extension arm 250 is arranged in parallel with the central axis of the communication pipe body 200.
[0052] In this way, the two clamping walls 320 can jointly provide better clamping effect. When the clamping jaw 300 is clamped on the ground insertion rod 100, both clamping walls 320 can provide the best deformation amount.
[0053] From the above description, it can be seen that the above-mentioned embodiments achieve the following technical effects: by setting the clamping jaw 300 on the communication pipe body 200, and designing the cross section of the clamping jaw 300 in a C shape, the communication pipe body 200 can be slidably installed on the ground insertion rod 100 by the clamping jaw 300. When the user manually slides the communication pipe body 200, the communication pipe body 200 can slide along the axis direction of the ground insertion rod 100. The communication pipe body 200 is used to connect the water pipe and the spray head. Specifically, by setting openings at both ends of the communication pipe body 200, and setting elastic claw buckles 220 at the openings, the water pipe and the spray head are respectively inserted into the openings at both ends of the communication pipe body 200. The elastic claw buckles 220 will limit the water pipe or the spray head, so that the spray height can be adjusted by sliding the communication pipe body 200 along the axis direction of the ground insertion rod 100.
[0054] Unless specifically stated otherwise, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not limiting of the scope of the application. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and not of limitation. The detailed description is divided into sections to facilitate better understanding. Unless otherwise indicated, the materials, methods, and examples that are known to one of ordinary skill in the relevant art can not be discussed in detail. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values.
[0055] In the present specification, the terms "longitudinal", "transverse", "top", "bottom", "inner", "outer", "central", "axial", "radial", "circumferential" and the like are merely intended to facilitate the description of the application and simplify the description based on the directional or positional relationships shown in the drawings and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation. Are constructed and operated in a particular direction, therefore, cannot be understood as a limitation on the application.
[0056] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, under the premise of not, can make a number of improvements and refinements, these improvements and refinements also regarded as the protection scope of the present application.
Claims
1. A ground-mounted sprinkler irrigation device, characterized in that, include: Ground insertion pole (100); A connecting pipe (200) is slidably installed on the ground insertion rod (100). The interior of the connecting pipe (200) is hollow to form a water conveying chamber (210) inside the connecting pipe (200). Both ends of the connecting pipe (200) are open, and elastic claw buckles (220) are respectively provided at the openings at both ends of the connecting pipe (200) so that water pipes or nozzles can be detachably installed at both ends of the connecting pipe (200) through the elastic claw buckles (220). A clamping claw (300) is disposed on the outer peripheral surface of the connecting tube (200). The clamping claw (300) has a C-shaped cross-section so as to slidably install the connecting tube (200) onto the grounding rod (100) by means of the clamping claw (300).
2. The ground-mounted sprinkler irrigation device according to claim 1, characterized in that, The central axis of the connecting tube (200) is parallel to the central axis of the clamping claw (300), and the central axis of the connecting tube (200) is parallel to the length direction of the grounding rod (100).
3. The ground-mounted sprinkler irrigation device according to claim 1, characterized in that, An elastic sealing element (230) is provided inside the connecting pipe (200). The outer peripheral surface of the elastic sealing element (230) abuts against the inner wall of the water conveying chamber (210), and the end of the elastic claw buckle (220) abuts against the elastic sealing element (230).
4. The ground-mounted sprinkler irrigation device according to any one of claims 1 to 3, characterized in that, The inner walls of the openings at both ends of the connecting tube (200) protrude radially to form a limiting platform (240), and the end of the elastic claw buckle (220) protrudes outward to provide a limiting protrusion (223).
5. The ground-mounted sprinkler irrigation device according to claim 4, characterized in that, The elastic claw buckle (220) includes: Abutting ring (221), one end of which is provided with abutting plane (221a); Multiple elastic tube walls (222) are circumferentially spaced on the abutting plane (221a); Multiple metal sheets (224) are embedded one-to-one on the inner circumferential surface of multiple elastic tube walls (222); There are multiple limiting protrusions (223), and the multiple limiting protrusions (223) are installed one-to-one on the outer peripheral surface of the multiple elastic tube walls (222). The limiting platform (240) is located between the abutment ring (221) and the limiting protrusions (223).
6. The ground-mounted sprinkler irrigation device according to claim 5, characterized in that, The axial length of the elastic tube wall (222) is greater than the axial length of the limiting platform (240) so that the end of the elastic tube wall (222) can undergo elastic deformation when the abutting plane (221a) abuts against the outer end face of the limiting platform (240).
7. The ground-mounted sprinkler irrigation device according to claim 5, characterized in that, The outer wall of the elastic tube wall (222) fits against the inner wall of the limiting platform (240) so that the outer wall of the elastic tube wall (222) is slidably connected to the inner hole of the limiting platform (240).
8. The ground-mounted sprinkler irrigation device according to any one of claims 1 to 3, characterized in that, The outer peripheral surface of the connecting tube (200) extends outward to form an extension arm (250), and the clamping claw (300) is installed at the end of the extension arm (250). The clamping claw (300), the extension arm (250) and the connecting tube (200) are integrally formed.
9. The ground-mounted sprinkler irrigation device according to claim 8, characterized in that, A slot (310) is provided on one side of the clamping claw (300) to divide the clamping claw (300) into two opposing clamping walls (320) through the slot (310). Both clamping walls (320) of the clamping claw (300) are arc-shaped tube wall portions, so that the grounding rod (100) is engaged between the two clamping walls (320) through the opening of the clamping claw (300), and the clamping claw (300) can slide in the length direction of the grounding rod (100).
10. The ground-mounted sprinkler irrigation device according to claim 9, characterized in that, The gripper (300) is connected to the extension arm (250) on the side away from the slot (310), and the extension plane of the extension arm (250) is parallel to the central axis of the connecting tube (200).