Underground water monitoring well protection structure

Abstract

The utility model relates to a protection device of an underground water monitoring well, in particular to a protection structure of the underground water monitoring well. The protection structure comprises an underground water monitoring well arranged on the ground, and an internal thread is arranged on the inner wall of the underground water monitoring well; external threads are arranged on the outer surface of the shielding pipe and can be in threaded connection with the internal threads, and a shielding plate capable of shielding the wellhead is hinged to the shielding pipe; a safety mechanism is arranged on one side of the shielding plate, and a positioning mechanism is arranged on the other side. Through the design, external foreign matters are effectively prevented from entering the underground water monitoring well, the safety and the stability of a monitoring environment are improved, the accuracy and the reliability of monitoring data are ensured, meanwhile, the opening and the closing of a well mouth are easier by adopting flip-type operation, the interior of the monitoring well is easy to repair and maintain, and the safety of the underground water monitoring well is improved. And the safety mechanism on the shielding plate can provide additional safety protection during operation of a worker, so that accidental collision is reduced, and meanwhile, the operation convenience is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a protection device for a groundwater monitoring well. BACKGROUND

[0002] Groundwater monitoring is a key link in environmental protection and water resource management. By regularly collecting water samples and conducting analysis, changes in water quality can be detected in a timely manner, preventing potential environmental pollution risks. This process not only helps in scientific decision-making, but also provides important protection for public health. However, in practical applications, groundwater monitoring wells face many challenges, such as the influence of external environment, equipment damage, and safety hazards. In order to ensure the accuracy and safety of monitoring data, existing groundwater monitoring wells usually need to be equipped with corresponding protection measures.

[0003] Currently, in order to solve the safety problem of groundwater monitoring wells, common methods include using fixed cover plates, setting up protective railings, installing rainproof sheds, etc. Among them, the fixed cover plate is mainly used to prevent foreign matter from entering the inside of the monitoring well, reducing the interference to the monitoring instrument; the protective railing mainly plays a physical isolation role to avoid personnel from entering the dangerous area by mistake; and the rainproof shed is used to prevent rainwater from directly washing the wellhead, maintaining the dry state of the well. In addition, some other methods are widely used, such as using a movable shielding cover to temporarily close the wellhead, or laying a waterproof cloth around the wellhead to further enhance the protection effect. Although these methods can improve the safety of the monitoring well to some extent, there are still some shortcomings in practical application.

[0004] In view of the related technology in the above, the inventor believes that although the protection measures in the above prior art can improve the safety performance of the groundwater monitoring well to some extent, there are still obvious defects. First, once the fixed cover plate is installed, it is difficult to adjust, and cannot adapt to the needs in different environments, resulting in that it cannot respond quickly in special situations, especially in a narrow space, which is particularly inconvenient, in addition, the traditional protection measures have limited response ability to unexpected situations, and cannot effectively protect the personal safety of the workers, therefore, how to design a device that can be flexibly adjusted, conveniently opened and closed, and effectively protect the groundwater monitoring well becomes a technical problem to be solved. CONTENT OF THE INVENTION

[0005] In order to solve the above problems, the application provides a groundwater monitoring well protection structure.

[0006] The groundwater monitoring well protection structure provided by the application adopts the following technical scheme:

[0007] The utility model provides a groundwater monitoring well protection structure, including ground, groundwater monitoring well is arranged on the ground, the inner wall of groundwater monitoring well is provided with internal thread, still include the sheltering pipe, the outer surface of sheltering pipe is provided with external thread, the external thread can be with internal thread thread connection, the sheltering pipe is hinged with the sheltering board, the sheltering board can shelter the well mouth of groundwater monitoring well, the side of the sheltering board points to groundwater monitoring well is provided with safety mechanism, the side of the sheltering board away from groundwater monitoring well is provided with positioning mechanism.

[0008] By adopting the above technical scheme, the sheltering pipe can be screwed into or out of the groundwater monitoring well through the external thread and the internal thread on the inner wall of the groundwater monitoring well, thereby facilitating the control of the extension or retraction of the sheltering pipe below the ground according to actual needs. The sheltering board can effectively shield the well mouth of the groundwater monitoring well after the sheltering pipe is rotated into place, preventing foreign matter from entering the well. At the same time, the safety mechanism and the positioning mechanism on both sides of the sheltering board further improve the stability and safety of the entire protection structure.

[0009] Preferably, the side of the sheltering board pointing to the groundwater monitoring well is provided with a sealing ring, and the groundwater monitoring well is further provided with a sealing groove at the well mouth, and the sealing ring can move into the sealing groove as the sheltering board rotates.

[0010] By adopting the above technical scheme, when the sheltering board is closed, the sealing ring can tightly fit at the well mouth of the groundwater monitoring well, effectively preventing external impurities from entering the well and improving the safety and reliability of the water quality. The sheltering board can also be quickly opened through the hinged arrangement for maintenance of the monitoring equipment.

[0011] Preferably, the safety mechanism includes two support plates arranged on the sheltering board, the support plates are provided with mounting holes, rotating shafts are arranged in the mounting holes, rotating wheels are coaxially arranged on the rotating shafts, a plurality of wire grooves are arranged on the rotating wheels, a rotating motor is arranged on the sheltering board, the transmission end of the rotating motor is coaxially connected with the rotating shaft, a steel cable is arranged on the rotating wheel, and a safety assembly is arranged at the end of the steel cable away from the rotating wheel.

[0012] By adopting the above technical scheme, the groundwater monitoring well protection structure not only effectively prevents external impurities from entering the well, but also ensures the safety of personnel when they need to enter the monitoring well. Specifically, the safety mechanism on the sheltering board allows the worker to quickly wear the safety assembly in a short time, thereby improving work efficiency and ensuring safety during operation. In addition, the steel cable system driven by the rotating motor can automatically retract and extend the safety assembly, further simplifying the use process and improving the reliability and convenience of the overall device.

[0013] Preferably, the safety assembly comprises a connecting block arranged on the steel cable, at least two groups of safety belts are arranged on the connecting block, one end of the safety belt is provided with a first connecting block, a first threaded hole is arranged on the first connecting block, a connecting bolt is threadedly connected on the first threaded hole, and the other end of the safety belt is provided with a second connecting block, a second threaded hole is arranged on the second connecting block, and the connecting bolt can be threadedly connected with the first threaded hole and the second threaded hole at the same time.

[0014] By adopting the above technical scheme, the safety assembly can effectively improve the safety of the groundwater monitoring well. Specifically, the design of multiple groups of safety belts on the connecting block ensures that even if one safety belt fails, the other safety belts can still function, ensuring that personnel or equipment are not threatened by the failure of a single component. Meanwhile, the use of threaded holes on the first and second connecting blocks and the connecting bolt allows the position of the safety belt to be quickly and conveniently fixed.

[0015] Preferably, the positioning mechanism comprises a first positioning plate arranged on the shielding plate, a first positioning threaded groove is arranged on the first positioning plate, and a positioning assembly is threadedly connected in the first positioning threaded groove.

[0016] By adopting the above technical scheme, not only can external debris be effectively prevented from entering the interior of the groundwater monitoring well, but also the stability and reliability of the shielding plate can be ensured. Specifically, the use of the first positioning threaded groove on the first positioning plate and the positioning assembly allows the shielding plate to be firmly fixed at a predetermined position when opened, avoiding displacement or loosening of the shielding plate due to external factors, thereby improving the safety performance of the entire protection structure. In addition, this design also facilitates maintenance and replacement, improving the operational convenience.

[0017] Preferably, the positioning assembly comprises a positioning rod, a threaded portion is arranged on the outer edge of the positioning rod, the threaded portion is threadedly connected with the first positioning threaded groove, a fixed portion is arranged on one end of the positioning rod pointing to the ground, and a first operating rod is arranged on the positioning rod.

[0018] By adopting the above technical scheme, the positioning rod in the positioning assembly can be firmly threadedly connected with the first positioning threaded groove and inserted into the ground, ensuring that the shielding plate does not loosen or displace during use, thereby effectively stabilizing and fixing the shielding plate. In addition, the fixed portion at the lower end of the positioning rod further enhances the stability of the overall structure, preventing external factors from affecting the shielding plate.

[0019] Preferably, a second positioning plate is further arranged on the shielding plate, a second positioning threaded groove is arranged on the second positioning plate, and the threaded portion is threadedly connected in the first positioning threaded groove.

[0020] By adopting the above technical scheme, the design of the second positioning plate and the second positioning threaded groove further enhances the stability of the shielding plate, ensures that the shielding plate will not deviate under strong wind or external force, and greatly improves the safety.

[0021] Preferably, it further comprises a supporting mechanism, which comprises a supporting threaded hole arranged on the first positioning plate, a supporting rod threadedly connected in the supporting threaded hole, an end of the supporting rod pointing to the ground is provided with a supporting disc, and a second operating rod is arranged on the supporting rod.

[0022] By adopting the above technical scheme, the supporting mechanism can effectively enhance the stability of the shielding plate, prevent the shielding plate from being displaced or tilted due to external environmental changes, and thus ensure the safety and reliability of the groundwater monitoring well. At the same time, the design of the supporting disc increases the supporting area, further improving the stability of the entire protection structure.

[0023] Preferably, it further comprises a plurality of clamping assemblies arranged on the ground, which are used to fix the shielding pipe.

[0024] By adopting the above technical scheme, the clamping assembly can effectively fix the position of the shielding pipe, prevent it from moving due to external factors such as wind or human collision, and ensure the stability and safety of the groundwater monitoring well. In addition, the design of the clamping assembly allows the shielding pipe to be quickly disassembled and installed when needed, improving the convenience of maintenance and inspection.

[0025] Preferably, the clamping assembly comprises a guide sleeve arranged on the ground, a clamping rod is slidably connected in the guide sleeve, a clamping hole is arranged on the shielding pipe, the clamping hole is arranged below the external thread, and the clamping rod can be inserted into the clamping hole.

[0026] By adopting the above technical scheme, the arrangement of the clamping assembly effectively prevents the shielding pipe from rotating or falling off during use, improving the stability and safety of the groundwater monitoring well protection structure. The clamping rod in the guide sleeve can be conveniently inserted into the clamping hole on the shielding pipe to achieve quick locking and unlocking, simplifying the operation process and enhancing the practicality and reliability of the equipment.

[0027] In summary, the present application has the following at least one beneficial technical effect:

[0028] 1. The shielding pipe is fixed to the inner wall of the groundwater monitoring well by means of internal and external thread connection, so that the shielding pipe can be conveniently assembled and disassembled and the position can be adjusted, improving flexibility and adapting to different environmental requirements.

[0029] 2. The safety mechanism on the shielding plate can provide additional safety protection when the staff is operating, reduce collisions, and improve personal safety protection. Meanwhile, the hinged design can make the opening and closing of the wellhead more convenient, facilitating the maintenance of the equipment in the well.

[0030] 3. The design of the positioning mechanism ensures the stability and reliability of the shielding plate in the open state, avoids loosening or displacement of the shielding plate due to external factors, reduces the danger of personnel during well maintenance, and thus ensures the safety of the underground water monitoring well. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the structure of a partial cross-section of an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of the structure of another partial cross-section of an embodiment of the present application;

[0034] Figure 4 is a schematic diagram of the structure of a part of an embodiment of the present application;

[0035] Figure 5 is an enlarged schematic diagram of the structure at A of Figure 4

[0036] BRIEF DESCRIPTION OF DRAWINGS: 1, ground; 101, underground water monitoring well; 102, internal thread; 103, shielding pipe; 104, external thread; 105, shielding plate; 106, sealing ring; 107, sealing groove; 2, safety mechanism; 201, support plate; 202, mounting hole; 203, rotating shaft; 204, rotating wheel; 205, wire slot; 206, rotating motor; 207, steel cable; 208, safety component; 2081, connecting block; 2082, safety belt; 2083, first connecting block; 2084, first threaded hole; 2085, connecting bolt; 2086, second connecting block; 2087, second threaded hole; 3, positioning mechanism; 301, first positioning plate; 302, first positioning threaded groove; 303, positioning component; 3031, positioning rod; 3032, threaded part; 3033, fixed part; 3034, first operating rod; 304, second positioning plate; 305, second positioning threaded groove; 4, support mechanism; 401, support threaded hole; 402, support rod; 403, support disc; 404, second operating rod; 5, detent component; 501, guide sleeve; 502, detent rod; 503, detent hole. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying Figures 1-5 The present application will be further described in detail.​

[0038] The groundwater monitoring well 101 protection structure provided by the embodiment of the application, with reference to Figure 1 and Figure 2 , comprises a ground 1, a groundwater monitoring well 101 is arranged on the ground, an inner thread 102 is arranged on the inner wall of the groundwater monitoring well 101, a shielding pipe 103 is further arranged, an outer thread 104 is arranged on the outer surface of the shielding pipe 103, the outer thread 104 can be threadedly connected with the inner thread 102, a shielding plate 105 is hingedly connected to the shielding pipe 103, the shielding plate 105 can shield the well mouth of the groundwater monitoring well 101, a safety mechanism 2 is arranged on the side of the shielding plate 105 which points to the groundwater monitoring well 101, and a positioning mechanism 3 is arranged on the side of the shielding plate 105 which is away from the groundwater monitoring well. This structure makes the groundwater monitoring well 101 have better protection effect when affected by external environment, and is convenient for operation and maintenance.

[0039] Specifically, the outer diameter of the shielding pipe 103 is slightly smaller than the inner diameter of the groundwater monitoring well 101, so as to ensure that the two can be smoothly screwed. The material of the shielding pipe 103 can be selected from stainless steel or aluminum alloy, and the two materials have good corrosion resistance and strength, and are suitable for long-term exposure to outdoor environment. The length of the shielding pipe 103 can be customized according to actual needs.

[0040] The shielding plate 105 is connected with the shielding pipe 103 through a hinged seat and can freely rotate in the vertical direction. The material of the shielding plate 105 is also selected from stainless steel or aluminum alloy. As an optional embodiment, a password lock or other lock structure can be arranged between the shielding plate 105 and the shielding pipe 103, so that the staff can quickly open the shielding plate 105, while preventing others from opening. The surface of the shielding plate 105 can be coated with a layer of anticorrosive paint to increase the service life. The shape of the shielding plate 105 is usually circular or square, and the edge part can be designed to be rounded to reduce the safety hazard caused by sharp corners.

[0041] With reference to Figure 4 and Figure 5The safety mechanism 2 on the shielding plate 105 mainly comprises two support plates 201, the support plates 201 are provided with mounting holes 202, the mounting holes 202 are provided with rotating shafts 203, the rotating shafts 203 are coaxially provided with rotating wheels 204, and the rotating wheels 204 are provided with a plurality of wire grooves 205. The rotating wheels 204 can be fixed on the support plates 201 through bearings to ensure smooth rotation. The transmission end of the rotating motor 206 is coaxially connected with the rotating shaft 203 to drive the rotating wheel 204 to rotate. The rotating motor 206 can be a direct current motor or a stepping motor, the former has fast response speed, and the latter has high control precision. The steel cable 207 can be selected from high-strength nylon rope or galvanized steel wire rope, and the two ends are respectively fixed on the rotating wheel 204 and the safety assembly 208 to ensure that the force is transmitted and the steel cable 207 is not easy to break. When it is necessary to open and overhaul, the steel cable 207 is loosened, the safety assembly 208 is lowered to a predetermined position, and the staff can enter the well for work.

[0042] With reference to Figure 5 The safety assembly 208 comprises a connecting block 2081 provided on the steel cable 207, the connecting block 2081 is provided with at least two groups of safety belts 2082, each group of safety belts 2082 is provided with a first connecting block 2083 and a second connecting block 2086. The first connecting block 2083 is provided with a first threaded hole 2084, and the second connecting block 2086 is provided with a second threaded hole 2087, and the two are fastened together through a connecting bolt 2085. Ensure stable connection. The width and length of the safety belt 2082 are determined according to actual needs, and the material of the safety belt 2082 can be selected from polyester fiber or nylon, which has good wear resistance and anti-aging performance. When the safety assembly 208 is lowered, the safety belt 2082 is unfolded, and the staff wears it on the body, and is fixed and connected through the bolt and the threaded hole, to ensure the personal safety of the staff.

[0043] The safety mechanism 2 on the shielding plate 105 drives the rotating wheel 204 to rotate through the rotating motor 206, so as to drive the steel cable 207 to be wound and unwound.

[0044] With reference to Figure 3, The positioning mechanism 3 comprises a first positioning plate 301, a first positioning threaded groove 302 is arranged on the first positioning plate 301, and a positioning assembly 303 is threadedly connected in the first positioning threaded groove 302. The first positioning plate 301 can be made of a steel plate and is welded on the shielding plate 105. The positioning assembly 303 is composed of a positioning rod 3031 and a fixing portion 3033, a threaded portion 3032 is arranged on the outer edge of the positioning rod 3031, and the threaded portion 3032 is matched with the first positioning threaded groove 302. The length of the positioning rod 3031 depends on the actual application scene, when it is needed to fix the shielding plate 105, the positioning rod 3031 is screwed into the first positioning threaded groove 302 until the fixing portion 3033 contacts the ground 1. Due to the existence of the fixing portion 3033, even under the action of wind force or other external force, the shielding plate 105 is not easy to loosen. This design simplifies the fixing process, saves time and labor, and at the same time enhances the stability of the structure, a second guide plate further stabilizes the structure, a first operating rod 3034 is arranged on the positioning rod 3031, and the positioning rod 3031 is convenient to operate.

[0045] With reference to Figure 2 In addition, a clamping assembly 5 is further arranged and used for fixing the shielding pipe 103. The clamping assembly 5 comprises a guide sleeve 501 arranged on the ground 1, a clamping rod 502 is slidably connected in the guide sleeve 501, and a clamping hole 503 is arranged on the shielding pipe 103 and below the external thread 104, and the clamping rod 502 can be inserted into the clamping hole 503. The material of the guide sleeve 501 can be cast iron or steel, the inner and outer walls are smooth, the clamping rod 502 is convenient to slide, and the diameter of the clamping hole 503 is matched with the clamping rod 502. This design can effectively prevent the shielding pipe 103 from deviating during use, and ensure the stability and reliability thereof. When it is needed to fix the shielding pipe 103, the clamping rod 502 is inserted into the clamping hole 503, the shielding pipe 103 is prevented from moving, and the position of the shielding pipe 103 is fixed.

[0046] With reference to Figure 3 Further, a supporting mechanism 4 is arranged and comprises a supporting threaded hole 401 arranged on the first positioning plate 301, a supporting rod 402 is threadedly connected in the supporting threaded hole 401, and a supporting disc 403 is arranged at one end of the supporting rod 402 and faces the ground 1. The length of the supporting rod 402 depends on the actual application scene, and the material can be stainless steel or aluminum alloy. As an embodiment, a layer of anti-skid pad is arranged at the bottom of the supporting disc 403, friction is increased, and sliding is prevented, a second operating rod 404 is arranged on the supporting rod 402, and the supporting rod 402 is more convenient to operate. This design can effectively disperse pressure, avoid deformation and damage caused by concentrated stress, and prolong the service life of the equipment. When it is needed to enhance the stability of the shielding plate 105, the supporting rod 402 is screwed into the supporting threaded hole 401, the supporting disc 403 contacts the ground 1, a stable structure is formed, and the shielding plate 105 is prevented from tilting or shaking.

[0047] The implementation principle of the groundwater monitoring well 101 protection structure provided by the embodiment of the application is as follows: the utility model provides a groundwater monitoring well 101 protection structure which is high in flexibility and strong in safety. Firstly, the combination design of the shielding pipe 103 and the shielding plate 105 realizes effective closing and opening of the groundwater monitoring well 101; the shielding pipe 103 is fixed to the inner wall of the groundwater monitoring well 101 in a way that the shielding pipe 103 is connected with the inner wall through internal and external threads 104, so that the shielding pipe 103 can be conveniently disassembled, assembled and adjusted in position, the flexibility is improved, the demand in different environments is adapted, daily inspection is facilitated, and rapid response in an emergency situation is also realized. Secondly, the introduction of the safety mechanism 2 and the positioning mechanism 3 greatly improves the reliability of the whole system and reduces the operation difficulty and risk of the staff.

[0048] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A groundwater monitoring well protection structure comprising a ground surface (1), characterized in that, The ground (1) is provided with a groundwater monitoring well (101), the inner wall of the groundwater monitoring well (101) is provided with an internal thread (102), further comprising a shielding pipe (103), the outer surface of the shielding pipe (103) is provided with an external thread (104), the external thread (104) can be threadedly connected with the internal thread (102), a shielding plate (105) is hinged to the shielding pipe (103), the shielding plate (105) can shield the well mouth of the groundwater monitoring well (101), a safety mechanism (2) is arranged on the side of the shielding plate (105) pointing to the groundwater monitoring well (101), and a positioning mechanism (3) is arranged on the side of the shielding plate (105) away from the groundwater monitoring well (101).

2. A groundwater monitoring well protection structure according to claim 1, wherein The side of the shielding plate (105) pointing to the groundwater monitoring well (101) is provided with a sealing ring (106), and a sealing groove (107) is arranged on the well mouth of the groundwater monitoring well (101), and the sealing ring (106) can move into the sealing groove (107) along with the rotating movement of the shielding plate (105).

3. A groundwater monitoring well protection structure according to claim 2, wherein The safety mechanism (2) comprises two support plates (201) arranged on the shielding plate (105), the support plates (201) are provided with mounting holes (202), a rotating shaft (203) is arranged in the mounting hole (202), a rotating wheel (204) is coaxially arranged on the rotating shaft (203), a plurality of wire grooves (205) are arranged on the rotating wheel (204), a rotating motor (206) is arranged on the shielding plate (105), the transmission end of the rotating motor (206) is coaxially connected with the rotating shaft (203), a steel cable (207) is arranged on the rotating wheel (204), and a safety assembly (208) is arranged at one end of the steel cable (207) away from the rotating wheel (204).

4. A groundwater monitoring well protection structure according to claim 3, wherein The safety assembly (208) comprises a connecting block (2081) arranged on the steel cable (207), at least two groups of safety belts (2082) are arranged on the connecting block (2081), a first connecting block (2083) is arranged at one end of the safety belt (2082), a first threaded hole (2084) is arranged on the first connecting block (2083), a connecting bolt (2085) is threadedly connected with the first threaded hole (2084), a second connecting block (2086) is arranged at the other end of the safety belt (2082), a second threaded hole (2087) is arranged on the second connecting block (2086), and the connecting bolt (2085) can be threadedly connected with the first threaded hole (2084) and the second threaded hole (2087) at the same time.

5. A groundwater monitoring well protection structure according to claim 4, wherein The positioning mechanism (3) comprises a first positioning plate (301) arranged on the shielding plate (105), the first positioning plate (301) is provided with a first positioning threaded groove (302), and a positioning assembly (303) is threadedly connected in the first positioning threaded groove (302).

6. A groundwater monitoring well protection structure according to claim 5, wherein The positioning assembly (303) comprises a positioning rod (3031), a threaded portion (3032) is arranged on the outer edge of the positioning rod (3031), the threaded portion (3032) is in threaded connection with the first positioning threaded groove (302), one end of the positioning rod (3031) pointing to the ground (1) is provided with a fixing portion (3033), and a first operating rod (3034) is arranged on the positioning rod (3031).

7. A groundwater monitoring well protection structure according to claim 6, wherein The shielding plate (105) is further provided with a second positioning plate (304), the second positioning plate (304) is provided with a second positioning threaded groove (305), and the first positioning threaded groove (302) is in threaded connection with the threaded portion (3032).

8. A groundwater monitoring well protection structure according to claim 7, wherein Further comprising a supporting mechanism (4), the supporting mechanism (4) comprises a supporting threaded hole (401) arranged on the first positioning plate (301), the supporting threaded hole (401) is in threaded connection with a supporting rod (402), one end of the supporting rod (402) pointing to the ground (1) is provided with a supporting disc (403), and a second operating rod (404) is arranged on the supporting rod (402).

9. A groundwater monitoring well protection structure according to claim 8, wherein Further comprising a plurality of groups of clamping assemblies (5) arranged on the ground (1), the clamping assemblies (5) are used for fixing the shielding pipe (103).

10. A groundwater monitoring well protection structure according to claim 9, wherein The clamping assembly (5) comprises a guide sleeve (501) arranged on the ground (1), a clamping rod (502) is in sliding connection in the guide sleeve (501), further comprises a clamping hole (503) arranged on the shielding pipe (103), the clamping hole (503) is arranged below the external thread (104), and the clamping rod (502) can be inserted into the clamping hole (503).

Images