Pressure measuring device for coal mine stope face

Abstract

A pressure measuring device for a coal mine stope face belongs to the technical field of coal mining and comprises a chassis, a guide frame is fixedly arranged on the chassis, a concentric-square-shaped frame capable of vertically moving is mounted on the guide frame, and a first through groove and a second through groove are formed in one end, slidably connected with the guide frame, of the concentric-square-shaped frame and are arranged up and down. A stress detector is movably arranged in the first through groove, a drill rod is movably arranged in the second through groove, the stress detector and the drill rod are transversely arranged, the stress detector is connected with a first electric telescopic unit, and the drill rod is connected with a first motor and a second electric telescopic unit. The first electric telescopic unit and the second electric telescopic unit are both transversely and fixedly installed in the concentric-square-shaped frame, the stress detector and the drill rod which are transversely arranged are adopted, stress detection can be directly conducted on the coal wall of a working face or the side of a roadway, and effective data are provided for supporting adjustment; and transverse drilling does not need to penetrate through multiple rock stratums, the drilling depth is small, and the geological condition limitation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a pressure measuring device for a coal mine longwall face. Background Technology

[0002] In coal mine production management, it is necessary to monitor and collect data in a timely manner on changes in the pressure of supports or brackets, anchor bolt tension, and surrounding rock stress at the coal mine longwall face in order to determine the working status of supports or brackets, the stress state of the surrounding rock, and the movement state of the overlying strata, so as to ensure safe production.

[0003] To reduce the labor intensity of workers, a pressure measuring device for coal mine longwall faces (publication number CN215485984U) has been developed. The drill rod moves downward, and when it reaches a certain depth, the first motor is controlled to move upward to remove the drill rod from the borehole. Then, the working chamber moves forward, and when the pressure detector moves above the borehole, the second motor is controlled to drive the first cylinder downward to insert the pressure detector into the borehole. The drilling and measurement process does not require manual hand operation, resulting in high work efficiency.

[0004] The aforementioned pressure measuring device for coal mine longwall faces uses a vertically downward drilling method to measure pressure, mainly measuring the stress of the base plate. It has poor targeting for stress detection of the coal face or roadway sidewalls, making it difficult to provide data support for adjusting the support. In addition, it needs to penetrate the coal seam and multiple layers of rock below, and the drilling depth is usually large (up to tens of meters). It has high requirements for the power and stability of the drilling equipment, a long construction period, and is easily restricted by geological conditions. When mining in layers, the drilling needs to be carried out in advance, and it is impossible to capture stress changes after mining in a timely manner. Utility Model Content

[0005] To address the technical problem that existing coal mine longwall face pressure measuring devices, which employ vertical downward drilling for pressure measurement, have poor targeting for stress detection in the coal face or roadway sidewalls and are difficult to provide data support for support adjustment, this utility model provides a coal mine longwall face pressure measuring device.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a pressure measuring device for a coal mine longwall face, including a chassis, a guide frame fixedly mounted on the chassis, and a vertically movable U-shaped frame mounted on the guide frame. A first and second through-slot are slidably connected to the guide frame at one end. The first and second through-slots are arranged vertically. A stress detector is movably mounted in the first through-slot, and a drill rod is movably mounted in the second through-slot. Both the stress detector and the drill rod are horizontally arranged. The stress detector is connected to a first electric telescopic unit, and the drill rod is connected to a first motor and a second electric telescopic unit. Both the first and second electric telescopic units are horizontally fixedly installed within the U-shaped frame. By using a horizontally arranged stress detector and drill rod, stress can be directly measured on the coal face or roadway sidewall, specifically addressing the problem that existing devices cannot detect stress in this area, providing effective data for support adjustment. Horizontal drilling does not require penetration through multiple rock strata, resulting in shallower drilling depths, reducing the power and stability requirements of the drilling equipment, shortening the construction cycle, and reducing geological limitations.

[0008] Preferably, a fixed frame is also fixedly installed on the chassis, the guide frame is arranged opposite to the fixed frame, and the U-shaped frame is located between the guide frame and the fixed frame. The fixed frame and the guide frame cooperate to form a stable frame structure, thereby improving the overall stability.

[0009] Preferably, lifting blocks are fixed on both sides of the spiral frame, and a second motor is fixedly installed on the fixed frame. A screw is fixedly connected to the output end of the second motor. The screw is vertically set on one side of the spiral frame and threadedly connected to the adjacent lifting block. The second motor drives the screw to rotate, thereby realizing the vertical lifting and lowering drive of the spiral frame. This not only enables the automatic switching of the positions of the drill rod and stress gauge to achieve the work of drilling first and then measuring pressure, but also allows for flexible adjustment of the height of the stress gauge and drill rod to adapt to the stress detection needs of coal walls or roadway sides at different heights. This allows for more flexible and timely stress detection after mining.

[0010] Preferably, a guide rod is fixedly installed between the fixed frame and the chassis. The guide rod is vertically arranged and distributed on both sides of the rotating frame opposite to the screw. The guide rod is slidably connected to the adjacent lifting block. The guide rod and the screw cooperate to further enhance the stability and guidance of the rotating frame during the lifting process, prevent the rotating frame from deviating or tilting during lifting, ensure that the stress tester and drill rod are always in the accurate working position, and improve the detection accuracy.

[0011] Preferably, one end of the stress detector is inserted into the first through slot, and the other end of the stress detector is fixedly connected to the first electric telescopic unit through a connecting block. The first electric telescopic unit can control the extension and retraction of the stress detector, so that it can stably penetrate into the predetermined position of the coal wall or roadway sidewall for stress detection. Compared with manual operation, it is more efficient and accurate, and the detection depth can be flexibly adjusted according to actual detection needs, thereby improving the reliability of the detection data.

[0012] Preferably, a guide groove is provided on the inner top wall of the U-shaped frame, and a guide block is fixedly provided on the upper surface of the connecting block. The guide block is slidably connected to the guide groove, which plays a guiding and stabilizing role in the movement of the connecting block and the stress detector, preventing the stress detector from shaking or deviating during the movement, ensuring that the stress detector can accurately detect the stress data at the target position, and improving the stability and reliability of the detection device.

[0013] Preferably, one end of the drill rod is inserted into the second through slot, and the other end of the drill rod is fixedly connected to a rotating shaft. The rotating shaft passes through the mounting block and is fixedly connected to the first motor. The mounting block is slidably connected to the retractable frame. The first motor is fixedly mounted on the mounting block. The telescopic end of the second electric telescopic unit is fixedly connected to the mounting block. The first motor drives the drill rod to rotate, and the second electric telescopic unit controls the extension and retraction of the drill rod, which can quickly complete the horizontal drilling operation.

[0014] Preferably, a stabilizing block is fixedly connected to each side of the mounting block, and a second electric telescopic unit is fixedly connected to each stabilizing block. The two second electric telescopic units cooperate with the stabilizing blocks, which not only improves the stability of the movement process, but also enhances the stability of the mounting block and the drill rod during operation, disperses the reaction force generated during drilling, prevents the drill rod from swinging or getting stuck due to uneven force, ensures the smooth progress of drilling operations, and improves the accuracy and quality of drilling.

[0015] Preferably, the chassis is fixedly equipped with casters on the lower end face and a handle is fixedly connected to the upper end face of the chassis, so that the pressure measuring device can be moved easily and quickly transferred to different pressure measuring positions. It is especially suitable for dynamic monitoring of longwall mining faces, and can perform stress detection in different areas more timely, improving detection efficiency and flexibility.

[0016] Preferably, the chassis threaded connection has two positioning cones, which are vertically arranged and distributed on both sides of the circular frame. After the pressure measuring device moves to the target position, the chassis can be firmly fixed by screwing the positioning cones into the ground, preventing the device from shifting during drilling and stress testing, ensuring the stable operation of the stress gauge and drill rod, and effectively improving the accuracy and reliability of the test data.

[0017] As can be seen from the above technical solutions, the advantages of this utility model are:

[0018] 1. By using a horizontally set stress tester and drill rod, along with a liftable spiral frame, drilling and stress testing can be performed directly on the coal face or roadway sidewalls, providing effective data for support adjustment. Furthermore, horizontal drilling does not require penetration through multiple rock layers, and the drilling depth is small, reducing the power and stability requirements of the drilling equipment, shortening the construction cycle, and reducing geological limitations.

[0019] 2. The vertical lifting drive of the rotary frame can not only automatically switch the positions of the drill rod and stress gauge to realize the work of drilling first and then measuring pressure, but also flexibly adjust the height of the stress gauge and drill rod to adapt to the stress detection needs of coal walls or roadway sides at different heights, and can more flexibly carry out stress detection in a timely manner after mining.

[0020] 3. The drill rod is connected to the mounting block via a rotating shaft, and is connected to two second electric telescopic units via stabilizing blocks on both sides of the mounting block. This not only improves the stability during movement, but also enhances the stability of the mounting block and the drill rod during operation. It disperses the reaction force generated during drilling, prevents the drill rod from swaying or jamming due to uneven force, ensures the smooth progress of drilling operations, and improves the accuracy and quality of drilling. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0022] Figure 1 This is a schematic diagram of the overall structure of the pressure measuring device for a coal mine longwall face according to one or more embodiments of the present invention.

[0023] Figure 2 This is a top view schematic diagram of the pressure measuring device for a coal mine longwall face according to one or more embodiments of the present invention.

[0024] Figure 3 This is a longitudinal sectional view of a coal mine longwall face pressure measuring device according to one or more embodiments of the present invention.

[0025] Figure 4 for Figure 3 An enlarged structural diagram of the structure at position A shown;

[0026] Figure 5 This is a schematic diagram of the main structure of the pressure measuring device for a coal mine longwall face according to one or more embodiments of the present invention.

[0027] The components represented by the various reference numerals in the diagram are:

[0028] 1. Chassis; 2. Guide frame; 3. Fixing frame; 4. Reverse frame; 5. First through slot; 6. Second through slot; 7. Stress gauge; 8. Connecting block; 9. First electric telescopic unit; 10. Drill rod; 11. Rotary shaft; 12. Mounting block; 13. First motor; 14. Stabilizing block; 15. Second electric telescopic unit; 16. Lifting block; 17. Second motor; 18. Screw; 19. Guide slot; 20. Guide block; 21. Guide rod; 22. Caster wheel; 23. Positioning cone; 24. Handle. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0030] Example 1

[0031] In a typical embodiment of this utility model, such as Figures 1-5 As shown, a pressure measuring device for a coal mine longwall face is proposed, comprising: a chassis 1, on which a guide frame 2 and a fixed frame 3 are fixedly installed. The guide frame 2 and the fixed frame 3 are arranged opposite to each other. The guide frame 2 is an inverted U-shaped structure. A spiral frame 4 is slidably connected to the guide frame 2. The spiral frame 4 is located between the guide frame 2 and the fixed frame 3. The spiral frame 4 can move vertically along the guide frame 2. One end of the spiral frame 4 is slidably disposed inside the guide frame 2, thereby guiding the spiral frame 4 and limiting the deviation of the end of the spiral frame 4 during the lifting and lowering process.

[0032] The U-shaped frame 4 has a U-shaped structure, meaning it is empty in the middle and has no obstructions on the sides. A first through groove 5 and a second through groove 6 are provided on one end of the U-shaped frame 4 that is slidably connected to the guide frame 2. Both the first through groove 5 and the second through groove 6 penetrate the end face of the U-shaped frame 4. The first through groove 5 and the second through groove 6 are arranged vertically, with the first through groove 5 located above the second through groove 6. A stress gauge 7 is movably installed in the first through groove 5. One end of the stress gauge 7 is inserted into the first through groove 5, and the other end of the stress gauge 7 is fixedly connected to a connecting block 8. A first electric telescopic unit 9 is fixedly connected to the end of the connecting block 8 away from the stress gauge 7. The first electric telescopic unit 9 is horizontally fixed inside the U-shaped frame 4. The first electric telescopic unit 9 can control the horizontal movement of the stress gauge 7, thereby aligning the stress gauge 7 with the position of the drill hole and ensuring that the stress gauge 7 is inside the drill hole for easy testing.

[0033] A guide groove 19 is provided on the inner top wall of the U-shaped frame 4. The guide groove 19 extends along the moving direction of the stress detector 7. A guide block 20 is slidably connected in the guide groove 19. The guide block 20 is fixedly connected to the upper surface of the connecting block 8. The guide block 20 slides in the guide groove 19 to guide the connecting block 8 and ensure that the connecting block 8 moves stably with the stress detector 7 without tilting or shaking.

[0034] A drill rod 10 is movably installed in the second through slot 6. One end of the drill rod 10 is inserted into the second through slot 6, and the other end of the drill rod 10 is fixedly connected to a rotating shaft 11. An installation block 12 is fitted on the rotating shaft 11, and the rotating shaft 11 and the installation block 12 are rotatably connected. The installation block 12 is slidably connected to the ring frame 4. A first motor 13 is fixedly connected to the end of the installation block 12 away from the drill rod 10. The output end of the first motor 13 is fixedly connected to the rotating shaft 11. A stabilizing block 14 is fixedly connected to each side of the installation block 12. A second electric telescopic unit 15 is fixedly connected to each stabilizing block 14. The second electric telescopic unit 15 is arranged laterally and parallel to the first electric telescopic unit 9. The second electric telescopic unit 15 is fixedly connected to the ring frame 4. By extending the two second electric telescopic units 15, the installation block 12 slides on the inner bottom wall of the ring frame 4. With the operation of the first motor 13, the rotating shaft 11 rotates the drill rod 10 quickly, so that the drill rod 10 drills the working surface.

[0035] In this embodiment, both the first electric telescopic unit 9 and the second electric telescopic unit 15 are electric telescopic rod structures. It can be understood that the driving power supply of the first electric telescopic unit 9 and the second electric telescopic unit 15 can be set on the chassis 1 and protected by a protective cover, or it can be directly powered by the power supply system in the tunnel. This is a conventional technical means, and will not be elaborated on here.

[0036] A lifting block 16 is fixedly connected to each side of the rotary frame 4. A second motor 17 is fixedly installed on the upper end of the fixed frame 3. The second motor 17 is vertically arranged, and a screw 18 is fixedly connected to the output end of the second motor 17. The screw 18 is vertically arranged on one side of the rotary frame 4. The screw 18 is rotatably connected to the fixed frame 3, and the screw 18 is threadedly connected to an adjacent lifting block 16. Under the action of the second motor 17, the rotary frame 4 is raised and lowered through the threaded engagement between the screw 18 and the lifting block 16. This not only enables the automatic switching of the positions of the drill rod 10 and the stress gauge 7 to achieve the work of drilling first and then measuring pressure, but also meets the pressure measurement requirements of working surfaces at different heights.

[0037] In this embodiment, a guide rod 21 is also fixedly installed between the fixed frame 3 and the chassis 1. The guide rod 21 is vertically arranged, and the guide rod 21 and the screw 18 are distributed on both sides of the circular frame 4. The guide rod 21 is slidably connected to another lifting block 16 on the circular frame 4. That is, the lifting blocks 16 on both sides of the circular frame 4, one of the lifting blocks 16 has a threaded hole, and the other lifting block 16 has a through hole. The setting of the guide rod 21 can provide auxiliary guidance for the circular frame 4, ensuring that the circular frame 4 always maintains a vertical up-and-down movement trajectory.

[0038] A caster wheel 22 is fixedly connected to each of the four corners of the lower end face of the chassis 1, and a handle 24 is fixedly connected to the upper end face of the chassis 1. The combination of the four caster wheels 22 and the handle 24 allows for flexible movement of the pressure measuring device, improving the flexibility of the pressure measuring device.

[0039] The chassis 1 also has two threaded holes, which are distributed opposite each other on both sides of the circular frame 4. Each threaded hole is threaded with a positioning cone 23. The positioning cone 23 is set vertically, with a pointed bottom and external threads on its outer wall. By adjusting the position of the two positioning cones 23, the positioning cones 23 can be inserted into the ground to ensure the stability of the chassis 1 and prevent it from tilting or shaking.

[0040] The specific working principle is as follows:

[0041] In use, the pressure measuring device is first moved to the desired position. The two positioning cones 23 are rotated one by one to insert them into the ground, ensuring the stability of the device. Then, the second motor 17 drives the screw 18 to rotate around the shaft. The threaded engagement between the screw 18 and the lifting block 16 drives the retractable frame 4 to rise and fall, so that the drill rod 10 is in the designated position. The first motor 13 is started, causing the rotating shaft 11 to rotate the drill rod 10 quickly. The two second electric telescopic units 15 extend and move the mounting block 12, allowing the drill rod 10 to quickly drill through the working surface. After drilling is completed, the two second electric telescopic units 15 retract, causing the drill rod 10 to retract. At the same time, the second motor 17 reverses, causing the retractable frame 4 to move the stress gauge 7 downward, making the stress gauge 7 coaxial with the borehole. The first electric telescopic unit 9 extends and moves the connecting block 8 and the stress gauge 7, allowing the stress gauge 7 to be inserted into the borehole to test the working surface. This completes the entire process of using the pressure measuring device.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure measuring device for a coal mine longwall face, comprising: The chassis (1) is characterized in that a guide frame (2) is fixedly provided on the chassis (1), and a vertically movable spiral frame (4) is installed on the guide frame (2). A first through groove (5) and a second through groove (6) are provided at one end of the spiral frame (4) which is slidably connected to the guide frame (2). The first through groove (5) and the second through groove (6) are arranged vertically. A stress detector (7) is movably provided in the first through groove (5), and a drill rod (10) is movably provided in the second through groove (6). The stress detector (7) and the drill rod (10) are both arranged horizontally. The stress detector (7) is connected to a first electric telescopic unit (9), and the drill rod (10) is connected to a first motor (13) and a second electric telescopic unit (15). The first electric telescopic unit (9) and the second electric telescopic unit (15) are both horizontally fixedly installed in the spiral frame (4).

2. The pressure measuring device for a coal mine longwall face according to claim 1, characterized in that, A fixed frame (3) is also fixedly installed on the chassis (1), the guide frame (2) is set opposite to the fixed frame (3), and the spiral frame (4) is located between the guide frame (2) and the fixed frame (3).

3. The pressure measuring device for a coal mine longwall face according to claim 2, characterized in that, Lifting blocks (16) are fixedly installed on both sides of the circular frame (4). A second motor (17) is fixedly installed on the fixed frame (3). A screw (18) is fixedly connected to the output end of the second motor (17). The screw (18) is vertically installed on one side of the circular frame (4), and the screw (18) is threadedly connected to the adjacent lifting block (16).

4. The pressure measuring device for a coal mine longwall face according to claim 3, characterized in that, A guide rod (21) is fixedly installed between the fixed frame (3) and the chassis (1). The guide rod (21) is set vertically. The guide rod (21) and the screw (18) are distributed on both sides of the circular frame (4). The guide rod (21) is slidably connected to the adjacent lifting block (16).

5. The coal face pressure measuring device according to claim 1, characterized in that, One end of the stress gauge (7) is inserted into the first through slot (5), and the other end of the stress gauge (7) is fixedly connected to the first electric telescopic unit (9) through the connecting block (8).

6. The pressure measuring device for a coal mine longwall face according to claim 5, characterized in that, A guide groove (19) is provided on the inner top wall of the ring frame (4), and a guide block (20) is fixed on the upper surface of the connecting block (8). The guide block (20) is slidably connected to the guide groove (19).

7. The pressure measuring device for a coal mine longwall face according to claim 1, characterized in that, One end of the drill rod (10) is inserted into the second through slot (6), and the other end of the drill rod (10) is fixedly connected to the rotating shaft (11). The rotating shaft (11) passes through the mounting block (12) and is fixedly connected to the first motor (13). The mounting block (12) is slidably connected to the retractable frame (4). The first motor (13) is fixedly installed on the mounting block (12), and the telescopic end of the second electric telescopic unit (15) is fixedly connected to the mounting block (12).

8. The pressure measuring device for a coal mine longwall face according to claim 7, characterized in that, A stabilizing block (14) is fixedly connected to each side of the mounting block (12), and a second electric telescopic unit (15) is fixedly connected to each stabilizing block (14).

9. The coal face pressure measuring device according to claim 1, characterized in that, A caster wheel (22) is fixedly installed on the lower end face of the chassis (1), and a handle (24) is fixedly connected to the upper end face of the chassis (1).

10. The pressure measuring device for a coal mine longwall face according to claim 1, characterized in that, The chassis (1) has two positioning cones (23) connected by threads. The positioning cones (23) are set vertically and the two positioning cones (23) are distributed on both sides of the ring frame (4).

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