A hole cover for a coal mine hydrologic observation hole

Abstract

The utility model discloses a kind of orifice covers for coal mine hydrology observation hole, it is related to coal mine equipment technical field, including orifice inner lining pipe, support plate and orifice cover body, the orifice inner lining pipe part is inserted into coal mine hydrology observation hole, the orifice inner lining pipe outer wall is circumferentially provided with several support plates, the support plate is installed with barb ground anchor, barb ground anchor is inserted into soil, fixed column is installed on orifice inner lining pipe, fixed column is connected with hinged arm by hinged pin shaft, the utility model is driven screw rod by rotating handle and moves downward, make orifice cover body uniform pressure tight sealing ring, form axial pressure tight sealing, this design not only can effectively prevent dust, gravel and other sundries in coal mine fall into observation hole, avoid to plug hydrology monitoring equipment, more can prevent harmful gas such as gas in hole escape or external air enters interference, ensure the accuracy of hydrology observation data and downhole operation safety, its sealing reliability far exceeds traditional gravity type cover body.

Description

Technical Field

[0001] This utility model relates to the field of coal mine equipment technology, specifically a manhole cover for a coal mine hydrological observation hole. Background Technology

[0002] Coal mining is an important industry for ensuring energy supply, but its underground working environment is extremely complex and often threatened by water hazards. The hydrogeological conditions of coal mines are intricate, and water accumulation in aquifers, fault zones, and goafs may cause water inrush and seepage accidents, which seriously endanger production safety. In order to effectively warn of such risks, coal mines generally construct hydrological observation wells. By continuously observing parameters such as water level and water pressure in the wells, the dynamics of groundwater can be analyzed, providing key data support for water hazard prevention and control.

[0003] The orifice cover is a critical component for protecting the observation well, and it needs to have multiple functions, including preventing debris from falling in, isolating interference, and maintaining the original hydrological environment inside the well. However, existing orifice covers have significant shortcomings. Traditional orifice covers rely solely on their own weight or simple snap-fit ​​mechanisms to achieve closure, resulting in limited sealing effectiveness. In the humid, dusty environment of underground coal mines, where pressure fluctuations (such as ventilation and gas outbursts) are present, such designs are prone to incomplete sealing. External impurities and dust can easily enter the well and contaminate the sensors, while gas leaks may also occur inside the well. This not only affects the accuracy of the observation data but may also pose safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a hole cover for hydrological observation holes in coal mines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution;

[0006] A wellhead cover for a coal mine hydrological observation well includes a wellhead liner, support plates, and a wellhead cover body. The wellhead liner is partially inserted into the coal mine hydrological observation well. Several support plates are circumferentially arranged on the outer wall of the wellhead liner. Barbed ground anchors are installed on the support plates and inserted into the soil. A fixing post is installed on the wellhead liner, and a hinge arm is connected to the fixing post via a hinge pin. An elastic locking pin is installed at the other end of the hinge arm, and the elastic locking pin engages with a locking groove on the wellhead liner. A threaded rod is rotatably installed in the middle of the hinge arm, and a rotating handle is installed at the top of the threaded rod. The bottom end of the threaded rod is fixedly connected to the wellhead cover body. The wellhead cover body is adapted to the size of a cylindrical rim provided on the wellhead liner, and a sealing ring is provided on the inner wall of the cylindrical rim.

[0007] As a further embodiment of this utility model, an observation window is installed on the orifice cover.

[0008] As a further improvement of this utility model, a high-pressure relief valve is installed on the orifice cover.

[0009] As a further improvement of this utility model, a triangular reinforcing plate is welded between the support plate and the inner lining tube of the orifice.

[0010] As a further embodiment of this utility model: the elastic locking pin includes a spring, a pin, and a guide rod. One end of the spring is fixed to a groove on the hinge arm, and the other end of the spring is fixed to the pin. Guide rods are provided on both sides of the spring. The guide rods pass through the pin and are fixed to the hinge arm at both ends. The pin is engaged with the corresponding insertion hole on the locking groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model drives the threaded rod downward by rotating the handle, so that the orifice cover is evenly pressed against the sealing ring to form an axial compression seal. This design can not only effectively prevent dust, gravel and other debris in the coal mine from falling into the observation hole and avoid clogging the hydrological monitoring equipment, but also prevent harmful gases such as methane from escaping from the hole or external air from entering and interfering with it, ensuring the accuracy of hydrological observation data and the safety of underground operations. Its sealing reliability far exceeds that of traditional gravity cover.

[0013] 2. The circumferentially distributed support plates and barbed anchors of this utility model anchor the inner lining pipe of the borehole into the stratum, forming a multi-point distributed support. This can effectively resist the stress changes of the surrounding rock and the bottom heave caused by coal mining, and prevent the overall tilting or sinking of the borehole. The triangular reinforcement plate further enhances the rigidity of the support structure, ensuring that the alignment between the center axis of the borehole and the observation instrument is not damaged when the underground equipment frequently rolls or the rock strata are slightly deformed, providing a stable foundation for long-term continuous monitoring. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of a manhole cover for a hydrological observation well in a coal mine.

[0015] Figure 2 This is an overall top view of a manhole cover for a hydrological observation well in a coal mine.

[0016] Figure 3 A type of manhole cover for hydrological observation wells in coal mines Figure 1 Enlarged view of the structure at point A in the middle.

[0017] 1. Inner liner of the orifice; 2. Support plate; 3. Barbed ground anchor; 4. Fixing post; 5. Hinge arm; 6. Hinge pin; 7. Threaded rod; 8. Rotating handle; 9. Orifice cover; 10. Sealing ring; 11. Cylinder edge; 12. Slot; 13. High pressure relief valve; 14. Observation window; 15. Triangular reinforcing plate; 16. Spring; 17. Pin; 18. Guide rod; 19. Insertion hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-2 In this embodiment of the utility model, a wellhead cover for a coal mine hydrological observation well includes a wellhead liner 1, a support plate 2, and a wellhead cover body 9. The wellhead liner 1 is partially inserted into the coal mine hydrological observation well. Several support plates 2 are arranged circumferentially on the outer wall of the wellhead liner 1. Barbed ground anchors 3 are installed on the support plates 2 and inserted into the soil. A triangular reinforcing plate 15 is welded between the support plate 2 and the wellhead liner 1. The triangular structure effectively disperses the stress from stratum deformation or external impact, preventing the welding point between the support plate 2 and the wellhead liner 1 from cracking or deforming due to long-term stress, thus ensuring the long-term durability of the wellhead anchoring system under the dynamic pressure environment of the coal mine.

[0020] Please see Figure 1-3 A fixing post 4 is installed on the inner liner tube 1 of the orifice. A hinge arm 5 is connected to the fixing post 4 via a hinge pin 6. An elastic locking pin is installed at the other end of the hinge arm 5. The elastic locking pin engages with the slot 12 provided on the inner liner tube 1 of the orifice. The elastic locking pin includes a spring 16, a pin 17 and a guide rod 18. One end of the spring 16 is fixed to a groove on the hinge arm 5, and the other end of the spring 16 is fixed to the pin 17. Guide rods are provided on both sides of the spring 16. The guide rods pass through the pin 17 and are fixed to the hinge arm 5 at both ends. The pin 17 engages with the corresponding insertion hole 19 on the slot 12. This design achieves automatic, reliable and durable locking of the hinge arm 5. The spring 16 provides continuous locking force, and the guide rod 18 ensures that the movement trajectory of the pin 17 is accurate, so that it can accurately engage with the insertion hole 19. This design avoids accidental unlocking due to vibration, ensures the stability of the hinge arm 5 in the open state, and makes the operation of the threaded rod 7 safer and more reliable.

[0021] A threaded rod 7 is rotatably mounted in the middle of the hinged arm 5. A rotating handle 8 is mounted on the top of the threaded rod 7. The bottom end of the threaded rod 7 is fixedly connected to the orifice cover 9. The orifice cover 9 is adapted to the size of the cylindrical edge 11 set on the inner liner tube 1 of the orifice. A sealing ring 10 is set on the inner wall of the cylindrical edge 11.

[0022] An observation window 14 is installed on the orifice cover 9, which gives the orifice cover a quick and visual inspection function. Its advantage is that the inspectors do not need to frequently open the heavy orifice cover 9. They can intuitively understand the approximate water level in the orifice or judge whether there is obvious blockage by simply looking through the observation window 14. This greatly improves the efficiency and convenience of daily inspections, while reducing the risk of wear on the sealing ring 10 or debris falling into the orifice due to frequent opening of the cover.

[0023] A high-pressure relief valve 13 is installed on the orifice cover 9. When the internal air pressure in the observation hole rises abnormally due to gas accumulation, sudden changes in water pressure, or other reasons, the pressure relief valve can automatically open to release the pressure, effectively preventing safety accidents such as the orifice cover 9 bursting or sealing failure due to pressure accumulation, and adding a safety barrier for underground coal mine operations.

[0024] The working principle of this utility model is:

[0025] In use, firstly, the operator lifts the hinge arm 5 upwards, causing it to rotate around the hinge pin 6 until the elastic pin on the hinge arm 5 automatically springs into the corresponding insertion hole 19 in the slot 12 on the fixed column 4 under the action of the spring force, thereby locking the hinge arm 5 in the vertically open state, making room for the operating orifice cover 9. Then, the rotating handle 8 installed at the top of the threaded rod 7 is rotated, and the threaded rod 7 is driven by the threaded transmission to move the orifice cover 9 at its bottom end smoothly downwards, so that the orifice cover 9 presses against the sealing ring 10 installed in the sleeve edge 11 on the orifice liner 1, forming a reliable seal using axial pressure. Finally, when the seal is in place, the rotating handle 8 is slightly rotated counterclockwise to generate a slight pre-tightening force on the threaded rod 7, ensuring that the cover continues to press against the sealing ring 10. The stability of the entire structure is ensured by the orifice liner 1, which is pre-anchored in the formation by the barbed anchor nails 3 on the support plate 2, effectively resisting changes in the downhole formation stress, and ultimately achieving the dual purpose of preventing the entry of debris and gas leakage.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wellhead cover for a hydrological observation well in a coal mine, comprising a wellhead liner (1), a support plate (2), and a wellhead cover body (9), characterized in that: The liner tube (1) of the orifice is partially inserted into the hydrological observation hole of the coal mine. Several support plates (2) are arranged circumferentially on the outer wall of the liner tube (1). Barbed ground anchors (3) are installed on the support plates (2) and are inserted into the soil. A fixing column (4) is installed on the liner tube (1). A hinge arm (5) is connected to the fixing column (4) through a hinge pin (6). An elastic spring is installed at the other end of the hinge arm (5). The locking pin and the elastic locking pin are engaged with the locking groove (12) provided on the inner liner tube (1) of the orifice. The hinge arm (5) is rotatably mounted with a threaded rod (7). The top of the threaded rod (7) is mounted with a rotating handle (8). The bottom end of the threaded rod (7) is fixedly connected to the orifice cover (9). The orifice cover (9) is adapted to the size of the cylindrical edge (11) provided on the inner liner tube (1). A sealing ring (10) is provided on the inner wall of the cylindrical edge (11).

2. The orifice cover for a coal mine hydrological observation well according to claim 1, characterized in that: An observation window (14) is installed on the orifice cover (9).

3. The orifice cover for a coal mine hydrological observation well according to claim 1, characterized in that: A high-pressure relief valve (13) is installed on the orifice cover (9).

4. The orifice cover for a coal mine hydrological observation well according to claim 1, characterized in that: A triangular reinforcing plate (15) is welded between the support plate (2) and the inner liner of the orifice (1).

5. A manhole cover for a coal mine hydrological observation well according to claim 1, characterized in that: The elastic locking pin includes a spring (16), a pin (17) and a guide rod (18). One end of the spring (16) is fixed to a groove on the hinge arm (5), and the other end of the spring (16) is fixed to the pin (17). Guide rods are provided on both sides of the spring (16). The guide rods pass through the pin (17) and are fixed to the hinge arm (5) at both ends. The pin (17) is engaged with the corresponding insertion hole (19) on the slot (12).

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