Rock movement monitoring installation device with separation alarm function

Abstract

The invention relates to the field of mine rock stratum movement monitoring, in particular to a rock movement monitoring installation device with a separation alarm function, which comprises a drill rod assembly and a heavy hammer assembly, the drill rod assembly comprises a conventional drill rod at the upper part and a non-magnetic drill rod at the lower part, and a magnetic ring is arranged on the inner wall of the lower part of the non-magnetic drill rod along the circumferential direction; the heavy hammer assembly comprises a heavy hammer and a heavy hammer guide rod on the top surface of the heavy hammer, a baffle is fixed on the heavy hammer guide rod at a certain distance from the upper part of the heavy hammer, and an inductive head is arranged at the upper part of the heavy hammer guide rod; the induction head is connected with an early warning wire, the early warning wire penetrates through a threading hole in the baffle, then is led to the ground and is connected with a buzzer on the ground, the buzzer gives an alarm when a circuit is closed within a certain distance between the induction head and the magnetic ring, and a rock movement monitoring cable is connected between the baffle and the heavy hammer guide rod between the heavy hammer. Based on the magnetic field induction principle of the Hall element, it can be ensured that the heavy hammer guide rod and the drill rod cooperatively descend.

Description

Technical Field

[0001] The invention relates to the field of rock movement monitoring in mines, and in particular to a rock movement monitoring installation device with a separation alarm function. Background Art

[0002] The movement and destruction of overlying rock strata or rock mass after mining is the root cause of a series of mine disasters and environmental problems, which seriously threaten the safe mining of coal resources and the ecological environment of mining areas. However, the law of rock movement caused by coal mining has always been a difficult "black box" problem in the mining field. Therefore, it is necessary to carry out monitoring of the development of cracks in the overlying rock strata and the movement and deformation of the rock strata after mining, and study and reveal its internal mechanism and evolution process, so as to master the law of overlying rock crack development and rock movement deformation caused by mining. This plays a vital role in preventing and controlling mine disasters, and is also the theoretical basis for scientifically solving a series of mining engineering problems caused by mining. In-situ monitoring of rock movement inside the overlying rock of mining is an effective means to reveal the law of rock movement. By arranging monitoring points inside the overlying rock, the movement and deformation of the overlying rock strata in the mining area are directly monitored, and the deformation and movement of the overlying rock of the coal mine working face are monitored in real time, which can quickly detect the abnormal movement of the overlying rock and load transfer caused by mining. It provides key information for rock stability assessment, mine disaster warning and mining area environmental protection, timely discovers the precursor characteristics of disaster incubation period, and conducts advance warning of strong mine pressure disasters to ensure the safe mining of coal resources.

[0003] At present, the in-situ monitoring of rock movement inside the overburden rock adopts ground drilling, and monitoring cables are placed in the boreholes to transmit the relative change data between the measuring point and the ground to the ground. During the installation of the internal rock movement monitoring cable, the rock movement monitoring cable is pulled by the weight guide rod, and the drill rod is lowered synchronously to complete the installation work. However, due to the complex underground drilling environment and the uncoordinated lowering of the weight guide rod and the drill rod, the weight guide rod is easy to detach from the drill rod, causing the weight guide rod to get stuck in the hole and affecting the installation efficiency of the rock movement monitoring cable. Therefore, in actual construction, there is an urgent need for a rock movement monitoring installation device with a detachment alarm function to improve the installation efficiency of the rock movement monitoring cable. Summary of the invention

[0004] In order to solve the problem that the heavy hammer guide rod is easily detached when installing the rock movement monitoring cable in the ground drilling hole for in-situ monitoring of rock movement inside the overlying rock, the present invention proposes a rock movement monitoring installation device with a detachment alarm function. The device can judge whether the heavy hammer guide rod is in a safe position in the drill rod when installing the rock movement monitoring cable, and alarm in time when there is a risk of the heavy hammer guide rod detaching from the drill rod, thereby avoiding the detachment of the heavy hammer guide rod, providing technical support for the smooth installation of the rock movement monitoring cable, and ensuring the efficient installation of the rock movement monitoring cable in the ground drilling hole for in-situ monitoring of rock movement inside the overlying rock.

[0005] Specifically, the rock movement monitoring installation device with the detachment alarm function includes a drill rod assembly and a weight assembly, the drill rod assembly includes a conventional drill rod on an upper portion and a non-magnetic drill rod on a lower portion, a magnetic ring is circumferentially arranged on the inner wall of the lower portion of the non-magnetic drill rod; the weight assembly includes a weight, a weight guide rod is arranged on the top surface of the weight, a baffle is fixed on the weight guide rod at a certain distance from the upper portion of the weight, and a sensing head is arranged on the upper portion of the weight guide rod; the sensing head is connected to an early warning wire, the early warning wire passes through the threading hole on the baffle and is led to the ground and connected to a buzzer on the ground, the buzzer alarms when the circuit is closed within a certain distance from the sensing head to the magnetic ring, and a rock movement monitoring cable is connected between the weight guide rod between the baffle and the weight.

[0006] Preferably, the magnetic ring is injection molded using engineering plastics and contains magnetic material.

[0007] Preferably, the magnetic ring is arranged at a position 0.5m to 1m away from the bottom end of the non-magnetic drill rod.

[0008] Preferably, the upper part of the weight is a cylinder and the lower part is a cone.

[0009] Preferably, the weight, weight guide rod and baffle are coaxially arranged.

[0010] Preferably, the sensing head is fixedly arranged on the upper part of the weight guide rod by means of a snap-fit.

[0011] Preferably, the induction head is arranged at one third of the upper portion of the weight guide rod.

[0012] Preferably, the sensor head uses a Hall element.

[0013] Preferably, the induction head housing is made of non-magnetic material and contains a magnetic field sensor consisting of a reed switch. When the induction head encounters a strong magnetic field, the reed switch is closed by the magnetic force, and when it is away from the strong magnetic field, the reed switch returns to its original state.

[0014] Preferably, the threading hole is close to the connection between the weight guide rod and the baffle.

[0015] The inventive point and beneficial effect of the present invention: Based on the magnetic field induction principle of the Hall element, when the inductive probe installed on the upper part of the weight guide rod is close to the magnetic ring installed on the lower part of the drill rod, the internal components of the inductive probe are affected by the magnetic field to close the circuit, thereby sending a warning signal to the ground to ensure that the weight guide rod and the drill rod are lowered in coordination. The technical solution has a simple principle and device structure, low cost, completes monitoring while lowering the rock movement monitoring cable, accurately transmits warning signals, can provide timely warnings, effectively prevent the weight guide rod from detaching, and well ensures the installation efficiency of the rock movement monitoring cable in the ground borehole for in-situ monitoring of rock movement inside the overburden. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the lower end of the drill rod and the weight guide rod of the present invention;

[0017] Figure 2 It is a three-dimensional structural diagram of the lower end of the drill rod and the heavy hammer guide rod of the present invention;

[0018] Figure 3 This is a schematic diagram of the installation of the inductive probe and the heavy hammer guide rod of the present invention;

[0019] In the figure: drill hole 1, drill rod 2, weight guide rod 3, weight 4, baffle 5, induction head 6, buckle 7, probe wire 8, magnetic ring 9, rock movement monitoring cable 10, overburden 11, threading hole 12. DETAILED DESCRIPTION

[0020] In order to better understand the technical content of the present invention, specific embodiments are cited and described as follows in conjunction with the accompanying drawings. In the present invention, various aspects of the present invention are described with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present invention are not limited to those described in the accompanying drawings. It should be understood that the present invention is implemented by any of the various concepts and embodiments introduced above, as well as the concepts and implementations described in detail below, because the concepts and embodiments disclosed in the present invention are not limited to any implementation. In addition, some aspects disclosed in the present invention can be used alone or in any appropriate combination with other aspects disclosed in the present invention.

[0021] like Figure 1-3 As shown, a rock movement monitoring installation device with a detachment alarm function proposed by the present invention includes a drill rod assembly and a weight hammer assembly, wherein the drill rod assembly includes a conventional drill rod at an upper portion and a non-magnetic drill rod 2 at a lower portion, wherein the non-magnetic drill rod 2 can be made of non-magnetic materials such as stainless steel or special alloys, and a magnetic ring 9 is fixedly arranged on the inner wall of the lower portion of the non-magnetic drill rod 2 along the circumferential direction, wherein the magnetic ring 9 is injection molded using engineering plastics and is filled with magnetic materials to form a magnetic ring, and the injection molding can enhance its corrosion resistance and prolong its service life; the magnetic ring 9 is preferably arranged at a position 0.5m to 1m away from the bottom end of the non-magnetic drill rod;

[0022] The weight assembly includes a weight 4, the upper part of the weight 4 is a cylinder and the lower part is a cone, the top surface of the weight 4 is coaxially provided with a weight guide rod 3, the upper part of the weight 4 is spaced a certain distance from the weight 4, a baffle 5 is coaxially fixed on the weight guide rod 3, a sensor head 6 is fixed on the upper part of the weight guide rod 3 by a buckle 7, the sensor head 6 is preferably arranged at one-third of the upper part of the weight guide rod 3, and the position of the sensor head 6 on the weight guide rod 3 can be adjusted by the buckle 7; the sensor head 6 is a Hall element, the shell is made of stainless steel or other non-magnetic materials, and the magnetic field composed of a reed switch is contained inside Sensor, when the induction head 6 encounters a strong magnetic field, the reed switch is closed by the magnetic force, and when it is away from the strong magnetic field, the reed switch returns to its original state and the circuit is disconnected. The power supply of the induction head can be a 9V alkaline battery; the induction head 6 is connected with an early warning wire 8, which is tightly attached to the weight guide rod 3, and then passes through the threading hole 12 on the baffle 5 and is led to the ground and connected to the buzzer on the ground. When the circuit is closed, the buzzer alarms, and the threading hole 12 is close to the connection between the weight guide rod 3 and the baffle 5. A rock movement monitoring cable 10 is connected between the weight guide rod 3 between the baffle 5 and the weight 4;

[0023] The induction head 6 is located on the upper part of the magnetic ring 9, and the safety distance between the induction head 6 and the magnetic ring 9 is L0. When the induction head 6 is located on the upper part of the magnetic ring 9 and the distance is greater than L0, the magnetic ring 9 has no effect on the induction head 6, which is an ideal position, and the buzzer will not alarm. When the distance between the induction head 6 and the magnetic ring 9 is less than or equal to L0, the buzzer will alarm. At this time, the drill rod assembly should be moved at a faster speed relative to the heavy hammer assembly.

[0024] The method of using the present invention is as follows: construct a borehole 1 for monitoring rock movement, insert the weight guide rod 3 of the weight assembly into the non-magnetic drill rod 2, lower the weight assembly and the drill rod assembly at the same time, and control the distance between the induction head 6 and the magnetic ring 9 to be greater than L0. When the weight assembly encounters a change in the drilling direction and is affected by the rock wall of the drill hole and cannot continue to be lowered by the gravity of the weight assembly, a force is applied to the baffle 5 through the drill rod assembly to make the weight assembly pass through the above-mentioned abnormal position. During the entire lowering process, the weight assembly should be prevented from separating from the drill rod assembly. When the distance between the induction head 6 and the magnetic ring 9 is less than or equal to L0, a buzzer alarm is sounded, and the drill rod assembly should be moved at a faster speed relative to the weight assembly.

[0025] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of methods under the inspiration of the present invention. Any technical solution that is the same or similar to that of the present application falls within the protection scope of the present invention.

Claims

1. A rock movement monitoring installation device with a detachment alarm function, characterized in that: It includes a drill rod assembly and a weight assembly, the drill rod assembly includes a conventional drill rod at an upper portion and a non-magnetic drill rod at a lower portion, a magnetic ring is circumferentially arranged on the inner wall of the lower portion of the non-magnetic drill rod; the weight assembly includes a weight, a weight guide rod is arranged on the top surface of the weight, a baffle is fixed on the weight guide rod at a certain distance from the upper portion of the weight, and a sensing head is arranged on the upper portion of the weight guide rod; the sensing head is connected to an early warning wire, the early warning wire passes through the threading hole on the baffle and is led to the ground and connected to a buzzer on the ground, the buzzer alarms when the circuit is closed when the sensing head is within a certain distance from the magnetic ring, and a rock movement monitoring cable is connected between the weight guide rod between the baffle and the weight.

2. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The magnetic ring is injection-molded using engineering plastics and contains magnetic material.

3. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The magnetic ring is arranged at a position 0.5m to 1m away from the bottom end of the non-magnetic drill rod.

4. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The upper part of the heavy hammer is a cylinder and the lower part is a cone.

5. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The weight, weight guide rod and baffle are coaxially arranged.

6. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The upper part of the weight guide rod is provided with a sensing head fixed by a buckle.

7. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The induction head is arranged at one third of the upper part of the weight guide rod.

8. The rock movement monitoring installation device with a separation alarm function according to any one of claims 1 to 7, characterized in that: The induction head uses a Hall element.

9. The rock movement monitoring installation device with a separation alarm function according to claim 8 is characterized in that: The induction head shell is made of non-magnetic material and contains a magnetic field sensor composed of a reed switch. When the induction head encounters a strong magnetic field, the reed switch is closed by the magnetic force. When it is away from the strong magnetic field, the reed switch returns to its original state.

10. The rock movement monitoring installation device with a separation alarm function according to claim 1 is characterized in that: The threading hole is close to the connection between the weight guide rod and the baffle.

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