Inclination angle sensing type goaf gangue lateral pressure monitoring device suitable for U-shaped steel gangue blocking

Abstract

The utility model relates to the field of coal mine safety monitoring, in particular to an inclination angle sensing type goaf gangue lateral pressure monitoring device suitable for U-shaped steel gangue blocking, which is characterized in that in the advancing process of a working face, when gob-side entry retaining gangue blocking erection is carried out, the device is installed at the lap joint position of two sections of U-shaped steel gangue blocking, and the U-shaped steel gangue blocking erection is carried out. And monitoring the lateral horizontal pressure applied to the roadway by the goaf gangue in real time. The device integrates a pressure sensor, a bearing plate, a hoop, a tilt angle sensor and a control box and supports wired and standby explosion-proof battery power supply, gangue pressure and tilt angle data are collected through the sensor, and lateral horizontal pressure is obtained after the data are processed by the control box and uploaded to a ground data processing center; when a transmission fault occurs, the storage card can be used for temporarily storing data; the inclination angle sensing type monitoring device is suitable for U-shaped waste rock blocking, can monitor the pressure of waste rock in a goaf in real time, is crucial to mine pressure analysis, roadway stability evaluation and support measure optimization, and can guide support work under similar conditions.

Description

Technical Field

[0001] The utility model relates to the field of coal mine safety monitoring, in particular to a goaf area gangue lateral horizontal pressure monitoring device. Background Art

[0002] Gob-side entry retention refers to a mining method that maintains the original entryway after mining at the working face, using specific technical means to re-support the previous section's drift, thereby preserving it for use in the next section. Waste rock support is a key technology for gob-side entry retention. During the entry construction process, to ensure the proper formation of the entryway and to maximize the role of the waste rock wall in bearing and supporting the roof, waste rock support is required on the side walls of the goaf to prevent the influx of falling waste rock into the entryway during the entry process. The movement of waste rock can easily damage the waste rock support structure, causing loose waste rock to continuously squeeze out of the damaged area and occupy the entryway space. This process not only affects ventilation and transportation but also increases the risk of fire in the goaf, severely restricting the widespread application of gob-side entry retention. Therefore, monitoring waste rock pressure is necessary to assess roadway stability, optimize waste rock retention measures, and ensure safe production.

[0003] The use of double-section U-shaped steel overlap as a slag retaining support is a common slag retaining support method, but the design of this type of slag retaining pressure sensor is rare. The existing pressure sensor needs to be fixed by workers in the goaf, which poses a serious threat to the safety of workers. Due to the deformation of the slag retaining, the pressure sensor installed on the slag retaining will be deflected, and the monitored data cannot truly reflect the pressure applied by the slag in the goaf to the side wall of the tunnel. In addition, the existing sensors often use a single form of power supply. When the power supply fails, it will cause data loss. Therefore, it is urgent to develop a goaf slag lateral pressure monitoring device with an inclination sensing type suitable for U-shaped steel slag retaining to solve the above problems. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model proposes a gangue lateral pressure monitoring device specially installed on a double-section U-shaped steel overlap structure as a gangue support along the goaf; the device is fixed in the tunnel, and the possible deformation of the gangue is taken into consideration during the design. It records in real time the pressure and angle of the gangue in the goaf squeezing the U-shaped steel gangue, and through processing, continuously monitors the horizontal pressure exerted by the gangue in the goaf on the side wall of the tunnel, which plays a vital role in in-depth analysis and summary of mine pressure laws, and in ensuring a safe and efficient production environment for the coal mine working face.

[0005] The above utility model for real-time monitoring of lateral pressure in goaf can be realized by the following technical solutions:

[0006] A tilt-sensing goaf gangue lateral pressure monitoring device suitable for U-shaped steel gangue retaining, characterized in that it includes a pressure sensor, which is connected to a control box via a pressure sensor transmission wire. The pressure sensor is installed on a rectangular connecting plate, which is equipped with a T-bolt. The T-bolt is connected to a clamp via a nut. The clamp is fixed at the overlapping position of a double-section U-shaped steel. A magnetic tilt sensor is installed on the back of the rectangular connecting plate inside the U-shaped steel. The magnetic tilt sensor is connected to the control box via a tilt sensor transmission wire, and the control box is powered by a power cord.

[0007] Preferably, a truncated cone-shaped pressure-bearing plate is installed on the front surface of the pressure sensor, and the pressure sensor is surrounded by a flexible protective cover.

[0008] Preferably, the rectangular connecting plate is welded with a square rotation limiting welding block to limit the rotation of the T-bolt, and the rectangular connecting plate is welded with a rectangular protective tube to protect the pressure sensor transmission wire in the goaf.

[0009] Preferably, a movable handle is installed on the top of the control box, a wireless transmission module is provided on the upper left side of the control box, an LED display is provided on the upper front side of the control box, a photosensitive module is provided above the LED display, a storage card slot is provided on the middle left side of the control box, the lower left side of the control box is powered by a power cord, and a spare explosion-proof battery is installed on the lower front side of the control box.

[0010] Preferably, the surfaces of the pressure sensor, the pressure plate, the rectangular connecting plate, the square rotation limiting welding block, the rectangular protective tube and the clamp are all covered with a corrosion-resistant coating layer.

[0011] The beneficial effects of the utility model are as follows:

[0012] (1) The utility model is combined with on-site construction to design a pressure sensor suitable for double-section U-shaped steel overlapped slag support. By combining the rectangular connecting plate and the clamp with T-bolts, the overlap fixation of the double-section U-shaped steel is completed, and the pressure sensor is installed, so that the two operations are combined in an orderly manner.

[0013] (2) A truncated cone-shaped pressure plate is installed on the front surface of the pressure sensor to ensure that the pressure of the gangue in the goaf is evenly applied to the pressure sensor, thereby improving the measurement accuracy.

[0014] (3) The pressure sensor is surrounded by a flexible protective cover, which can prevent the pressure sensor from undergoing oxidation reaction due to the continuous impact of water dripping from above after the corrosion-resistant coating on the surface is scratched by hard gangue, resulting in a decrease in its accuracy.

[0015] (4) A square rotation limit weld block is welded on the rectangular connecting plate to limit the rotation of the T-bolt. This design allows workers to fix the equipment only by tightening the nuts in the tunnel, avoiding working in dangerous goaf areas.

[0016] (5) A rectangular protective tube is welded on the rectangular connecting plate to protect the pressure sensor transmission wire exposed in the goaf and prevent signal transmission interruption caused by gangue squeezing the wire.

[0017] (6) The present invention takes into account the deformation of the U-shaped steel retaining rock, and therefore designs a magnetic inclination sensor. The sensor is located inside the retaining rock, and can ensure that the inclination measurement is not affected and provide protection even when the retaining rock is deformed by force. It can also transmit data on the force generated by the goaf rock squeezing the retaining rock and the vertical angle to the control box in real time. Through the triangle rule processing of force analysis, the lateral horizontal pressure applied by the goaf rock to the tunnel can be accurately calculated.

[0018] (7) The control box has two power supply modes. Under normal circumstances, wired power supply is carried out through the power cord. When an unexpected interruption of wired power supply is detected, the backup explosion-proof battery installed in the control box is immediately activated for temporary power supply, and the power supply abnormality information is uploaded to the well data processing center to ensure the continuous monitoring of the goaf gangue pressure.

[0019] (8) A wireless transmission module is provided on the upper left side of the control box. The gangue pressure data and the angle data between the U-shaped steel retaining gangue and the vertical direction monitored underground are uploaded to the surface data processing center in real time through the wireless transmission module, helping the surface personnel to summarize the mine pressure rules and issue early warnings for abnormal pressure situations.

[0020] (9) The memory card slot provided in the middle of the left side of the control box can be used to install a memory card. When the wireless transmission module fails and cannot transmit data, the data can be temporarily stored by the memory card installed in the memory card slot in the control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the effect diagram of this device.

[0022] Figure 2 This is the front view of the device.

[0023] Figure 3 This is the rear view of the device.

[0024] Figure 4 A top view of the device.

[0025] Figure 5 A side view of the device.

[0026] Figure 6 A side sectional view of the device.

[0027] Figure 7 This is a schematic diagram of the installation position of the magnetic inclination sensor of this device.

[0028] Figure 8 This is a schematic diagram of the device installed in the tunnel.

[0029] Legend: 11—pressure sensor; 12—pressure plate; 13—flexible protective cover; 14—pressure sensor transmission wire; 21—rectangular connecting plate; 22—square rotation limiting welding block; 23—rectangular protective tube; 24—T-bolt; 25—nut; 26—clamp; 3—U-shaped steel; 41—magnetic inclination sensor; 42—inclination sensor transmission wire; 5—control box; 51—movable handle; 52—wireless transmission module; 53—photosensitive module; 54—LED display; 55—memory card slot; 56—power cord; 57—explosion-proof battery; 6—gangue retaining steel mesh; 7—tunnel; 81—tunnel roof; 82—coal seam; 83—goaf gangue; 84—tunnel floor. DETAILED DESCRIPTION

[0030] In order to further understand the structure and function of this utility model, Figures 1 to 8 Detailed description.

[0031] The invention relates to a goaf gangue lateral pressure monitoring device of an inclination sensing type suitable for U-shaped steel gangue retaining device, characterized in that it comprises a pressure sensor (11), a truncated cone-shaped pressure plate (12) is installed on the front surface of the pressure sensor (11), the area of ​​the pressure plate (12) is larger than that of the pressure sensor in order to increase the contact area with the gangue, the pressure plate (12) is designed to be truncated cone-shaped in order to uniformly transmit the pressure of the goaf gangue to the pressure sensor, and avoid excessive concentration of pressure on a certain part of the sensor, the pressure sensor (11) is surrounded by a flexible protective cover (13), and avoids the corrosion-resistant coating from being worn due to the movement of the gangue, and the phenomenon that oxidation occurs when water accumulated above the goaf roof drips onto the sensor, resulting in a decrease in accuracy, and the pressure sensor (11) is installed on a rectangular connecting plate (21), the front surface of the rectangular connecting plate (21) is provided with a pressure sensor (11). A rectangular protective tube (23) is welded to protect the pressure sensor transmission wire (14) that transmits data to the control box (5). Four bolt holes are provided on the surface of the rectangular connecting plate (21). The T-bolt (24) passes through the holes of the rectangular connecting plate and is connected to two clamps (26) on the other side, one above and one below. A square rotation limiting welding block is welded on the front surface of the rectangular connecting plate (21) to limit the rotation of the T-bolt (24). The two sections of U-shaped steel (3) are overlapped and fixed by tightening the nut (25), and the installation of the pressure sensor is completed. A magnetic inclination sensor (41) is installed on the back of the rectangular connecting plate (21) inside the U-shaped steel (3). The magnetic inclination sensor transmits the force of the goaf gangue squeezing the gangue blocking gangue and the angle data in the vertical direction to the control box (5) through the inclination sensor transmission wire (42).

[0032] The top of the control box (5) is provided with a movable handle (51) which can be hung to a designated position. An LED display screen (54) is provided on the upper front of the controller. A photosensitive module (53) is provided above the LED display screen (54). The underground personnel can read the pressure and inclination data displayed on the LED screen (54) by irradiating the photosensitive module (53) with a mining lamp. A spare explosion-proof battery (57) is provided on the lower front of the control box (5) to ensure that the pressure sensor (1), the control box (5) and the magnetic inclination sensor (4) can be temporarily powered when the wired power supply is accidentally interrupted. After the power supply mode is switched, the information of the wired power supply failure is uploaded to the data processing center on the well surface through the wireless transmission module (52). The wireless transmission module (53) provided on the upper left side of the control box (5) is connected to the control box (5). 2) The pressure of the gangue squeezing the gangue, the angle between the squeezing pressure and the vertical direction, and the lateral horizontal pressure applied to the tunnel by the processed gangue can be transmitted to the data processing center on the well in real time. A storage card slot (55) is provided in the middle of the left side of the control box (5). After the storage card is inserted, the data that has not been uploaded due to the failure of the wireless transmission module can be temporarily stored. The control box (5) is powered by a power line (56) at the lower left side. The pressure sensor transmission wire (14) at the lower right side of the control box (5) is connected to the pressure sensor to transmit the pressure of the gangue squeezing the gangue from the goaf. The tilt sensor transmission wire (42) at the upper right side of the control box (5) is connected to the magnetic tilt sensor (41) to transmit the pressure of the gangue squeezing the gangue and the angle data in the vertical direction.

[0033] The utility model discloses an installation and use method of a goaf gangue lateral pressure monitoring device with an inclination sensing type suitable for U-shaped steel gangue retaining:

[0034] The first step is to determine the installation position of the pressure monitoring device after the mining of the working face is completed and the double-section U-shaped steel (3) rock retaining device is erected in the laneway, cut off a small part of the rock retaining steel mesh (6) between the overlapping position of the U-shaped steel (3) rock retaining device and the rectangular connecting plate, and reserve space for the installation of the magnetic inclination sensor (41).

[0035] In the second step, the rectangular connecting plate (21), the pressure sensor (11) welded on the rectangular connecting plate (21), and the magnetic inclination sensor (41) magnetically attracted to the rectangular connecting plate (21) are lifted to the designated overlapping position of the U-shaped steel (3) retaining rock on one side of the goaf.

[0036] The third step is to pass the T-bolt (24) through the rectangular connecting plate (21), the gangue retaining steel mesh (6) and the hoop (26), and then tighten the nut (25) to fix the U-shaped steel (3) and complete the installation of the pressure sensor.

[0037] The fourth step is to use the movable handle (51) to hang the control box (5) in a safe area near the equipment. After the power is supplied by the power cord (56), the mining lamp can be used to illuminate the photosensitive module (53) on the LED display screen (54) in the mine to view the equipment monitoring data. The first number that lights up is the pressure of the goaf gangue squeezing the U-shaped steel (3) to block the gangue. The second number that lights up is the angle between the pressure generated by the goaf gangue squeezing the U-shaped steel (3) to block the gangue and the vertical direction. The third number that lights up is the lateral horizontal pressure applied to the laneway by the goaf gangue after treatment.

[0038] The fifth step is to check whether there is any abnormality in the data transmitted to the well through the wireless transmission module (52) on the upper left side of the control box. If the wired power supply is abnormal, the wired power supply line can be troubleshooted. If the signal upload is abnormal, the wireless transmission module (52) should be repaired immediately. The data not transmitted during this period can be read through the memory card in the memory card slot (55).

[0039] It should be understood that the detailed description of the specific embodiments above does not constitute a narrow limitation on the scope of protection of this utility model. Informed by this utility model, those skilled in the art can flexibly implement various innovative variations, such as size adjustment, component replacement, and simple combination, without violating the core protection scope defined by the claims of this utility model. Such variations should be deemed to fall within the scope of protection of this utility model.

Claims

1. A device for monitoring the lateral pressure of goaf gangue with an inclination sensor suitable for U-shaped steel gangue retaining, characterized in that: The invention comprises a pressure sensor (11), wherein the pressure sensor (11) is connected to a control box (5) via a pressure sensor transmission wire (14), the pressure sensor (11) is mounted on a rectangular connecting plate (21), the rectangular connecting plate (21) is mounted with a T-bolt (24), the T-bolt (24) is connected to a clamp (26) via a nut (25), the clamp (26) is fixed at the overlapping position of a double-section U-shaped steel (3), a magnetic inclination sensor (41) is mounted on the back of the rectangular connecting plate (21) inside the U-shaped steel (3), the magnetic inclination sensor (41) is connected to the control box (5) via a inclination sensor transmission wire (42), and the control box (5) is connected to a power supply via a power line (56).

2. The device for monitoring lateral pressure of goaf gangue with an inclination sensing type suitable for U-shaped steel gangue retaining according to claim 1 is characterized in that: A truncated cone-shaped pressure-bearing plate (12) is installed on the front surface of the pressure sensor (11), and the pressure sensor (11) is surrounded by a flexible protective cover (13).

3. The device for monitoring lateral pressure of goaf gangue with an inclination sensing type suitable for U-shaped steel gangue retaining according to claim 1 is characterized in that: A square rotation limiting welding block (22) is welded on the front surface of the rectangular connecting plate (21) to limit the rotation of the T-bolt (24), and a rectangular protective tube (23) is welded on the rectangular connecting plate (21) to protect the pressure sensor transmission wire (14) in the goaf.

4. The device for monitoring lateral pressure of goaf gangue with an inclination sensing type suitable for U-shaped steel gangue retaining according to claim 1 is characterized in that: The top of the control box (5) is provided with a movable handle (51), the upper left side of the control box (5) is provided with a wireless transmission module (52), the upper front side of the control box (5) is provided with an LED display screen (54), the upper side of the LED display screen (54) is provided with a photosensitive module (53), the middle left side of the control box (5) is provided with a storage card slot (55), the lower left side of the control box (5) is powered by a power cord (56), and the lower front side of the control box (5) is provided with a spare explosion-proof battery (57).

5. The device for monitoring lateral pressure of goaf gangue with an inclination sensing type and suitable for U-shaped steel gangue retaining according to claim 1 is characterized in that: The surfaces of the pressure sensor (11), the pressure-bearing plate (12), the rectangular connecting plate (21), the square rotation-limiting welding block (22), the rectangular protective tube (23) and the hoop (26) are all covered with a corrosion-resistant coating layer.

Images