Electronic borehole stressometer

Abstract

The utility model relates to an electronic borehole stressometer, and belongs to the technical field of mine pressure safety monitoring. The borehole stress meter comprises a cylindrical base, the base is of a polyhedral structure, one end of the base is connected with a conical head, the other end of the base is connected with an electronic element unit, a plurality of sets of elastic strain bodies are evenly distributed and installed on the peripheral face of the base in the circumferential direction, and the elastic strain bodies are electrically connected with the electronic element unit. The end face of the electronic element unit is connected with a mounting rod. According to the electronic borehole stressometer designed by the utility model, the plurality of groups of elastic strain bodies are arranged on the periphery of the base, so that surrounding rock stress changes from multiple directions of a borehole can be monitored at the same time, the monitoring performance is better, and the stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of mine pressure safety monitoring, and particularly relates to an electronic borehole stress gauge. Background Art

[0002] Mine pressure monitoring is a very important task in the process of coal mining. By drilling holes in the coal mining roadway and installing borehole stress gauges, the stress changes of the surrounding rock around the borehole can be monitored in real time, so as to achieve early prediction of possible rock burst accidents. At present, there are various types of borehole stress gauges in the mine pressure safety monitoring market, among which the hydraulic oil pillow type borehole stress gauges are mostly used. The hydraulic oil pillow type borehole stress gauges have problems such as insufficient initial stress, insufficient telescopic performance, and pressure drop in the later stage during use, resulting in unsatisfactory monitoring effects. Content of the Utility Model

[0003] To solve the problems in the prior art, the utility model patent designs an electronic borehole stress gauge to solve the problem of unsatisfactory application effect of the existing borehole stress gauges.

[0004] The technical solution adopted by the utility model is as follows: the borehole stress gauge includes a cylindrical base. The base is a regular polyhedron structure. One end of the base is connected to a conical head, and the other end is connected to an electronic component unit. A group of elastic strain bodies are installed on the outer peripheral surface of the base, or multiple groups of elastic strain bodies are installed in a circumferentially evenly distributed manner. The elastic strain bodies are electrically connected to the electronic component unit, and an installation rod is connected to the end face of the electronic component unit.

[0005] Further, the borehole stress gauge is integrally coated with a flexible sheath on the outside of the elastic strain bodies.

[0006] Further, the middle part of the upper side of the elastic strain body bulges outward to form a pressure-bearing part, and the two ends of the bottom side bulge downward to form support feet. A deformation cavity is formed between the two support feet at both ends. Installation holes are respectively opened at both ends of the elastic strain body.

[0007] Further, a cavity is arranged along the axis of the base. Inner threaded holes and set screw positioning holes are respectively opened at both ends of each face of the base, and a wire passing hole is opened in the middle. The position of the inner threaded hole corresponds to the position of the installation holes at both ends of the elastic strain body. The wire passing hole is communicated with the cavity along the axis. The signal line of the elastic strain body is electrically connected to the electronic component unit through the cavity along the axis of the base.

[0008] Further, the electronic component unit includes a metal shell. A control circuit board is assembled inside the metal shell. An attitude sensor and a communication module are integrated on the control circuit board. A waterproof plug for connecting a communication line is exposed at the end of the metal shell.

[0009] Furthermore, the mounting rod includes a cross joint. The mounting rod is assembled and connected to the end of the metal housing through a cavity cover. A perforation is provided at the center of the cavity cover to expose the waterproof plug of the electronic component unit. The cavity cover is hermetically connected to the metal housing.

[0010] Furthermore, a flexible rubber filler is filled in the gaps between multiple groups of elastic strain bodies of the base.

[0011] Furthermore, the base is in a regular hexagonal prism structure, and elastic strain bodies are provided on six sides, four sides, two sides or one side of the outer periphery of the base.

[0012] Compared with the prior art, the improvements of an electronic borehole stress gauge designed by the utility model patent are as follows: the base of the borehole stress gauge is set in a regular hexagonal prism structure, and multiple groups of elastic strain bodies can be arranged on the surface of the base according to application requirements to realize the monitoring of stress changes from different directions in the borehole, and the monitoring data is more accurate; the borehole stress gauge uses elastic strain bodies as pressure-bearing elements, and the elastic strain bodies have high sensitivity to pressure bearing reaction, and there are no problems such as insufficient expansion and contraction performance of the hydraulic oil pillow and pressure loss in the later stage, and the overall stability is better, the monitoring period is long, and it can be used for a long time; a flexible sheath is integrally sleeved outside the elastic strain body of the borehole stress gauge, which can form better buffer protection for the elastic strain body, facilitate the installation of the borehole stress gauge, and can make the elastic strain body fully contact with the borehole wall to ensure the sensitivity of the monitoring reaction; an attitude sensor is integrated in the electronic component unit of the borehole stress gauge, and when arranging the stress gauge, the stress gauge can be adjusted according to the data fed back by the attitude sensor to ensure the accuracy of the monitoring data. Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the electronic borehole stress gauge.

[0014] Figure 2 is a top view sectional structural schematic diagram of the electronic borehole stress gauge.

[0015] Figure 3 is a side view sectional structural schematic diagram of the electronic borehole stress gauge.

[0016] Figure 4 is a structural schematic diagram of the base of the electronic borehole stress gauge.

[0017] Figure 5 is a structural schematic diagram of the elastic strain body of the electronic borehole stress gauge.

[0018] In the figure, 1 is the base, 2 is the elastic strain body, 3 is the metal shell, 4 is the control circuit board, 5 is the conical head, 6 is the mounting rod, 7 is the flexible sheath, 8 is the flexible rubber filling body, 11 is the cavity, 12 is the internal thread hole, 13 is the set screw positioning hole, 14 is the wire passing hole, 21 is the pressure-bearing part, 22 is the support foot, 41 is the attitude sensor, 42 is the waterproof plug, 61 is the cavity cover, and 62 is the cross joint. Specific embodiments

[0019] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present utility model are clearly and completely described. The described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0020] As Figure 1 、 2 shown in Figures 3, 4, 5, the present utility model patent designs an embodiment of an electronic drilling stress gauge. In this embodiment, the drilling stress gauge includes a base 1. One end of the base 1 is fixedly connected to a conical head 5, and the other end is fixedly connected to an electronic component unit. The end face of the electronic component unit is connected to a mounting rod 6.

[0021] The base 1 is a regular hexagonal prism structure, and a through cavity 11 is arranged along its axis. Both ends of the six faces of the base 1 are provided with internal thread holes 12 and set screw positioning holes 13, and a wire passing hole 14 is opened in the middle. The wire passing hole 14 communicates with the cavity 11 at the axis. The set screw positioning holes 13 at both ends are respectively used for assembling the conical head 5 and the electronic component unit at both ends of the base 1. A set of elastic strain bodies 2 are respectively assembled on the six outer peripheral surfaces of the base 1. The elastic strain bodies 2 are arranged along the axial direction, and mounting holes are respectively opened at both ends. The positions of the mounting holes at both ends correspond to the positions of the internal thread holes 12 at both ends of the six faces of the base 1, and are respectively fastened by bolt connections. The signal lines of the elastic strain bodies 2 pass through the wire passing hole 14 of the base 1 and are electrically connected to the electronic component unit through the cavity 11 at the axis of the base 1.

[0022] The elastic strain body 2 is a prior art. The middle part of its upper side protrudes outward to form a pressure-bearing part 21, and both ends of the bottom side protrude downward to form support feet 22. A deformation cavity is formed between the support feet 22 at both ends. The elastic strain body 2 will deform under the action of the measured pressure, and the degree of its deformation is proportional to the external force, so that the measured pressure value can be calculated. The flexible rubber filling body 8 is filled in the gaps between the groups of elastic strain bodies 2 on the base 1, and a flexible sheath 7 is integrally sleeved and coated on the outside, playing a role of protection and buffering for the groups of elastic strain bodies 2.

[0023] The electronic component unit includes a metal housing 3. A control circuit board 4 is assembled inside the metal housing 3. Function modules such as an attitude sensor 41 and a communication module are integrated on the control circuit board 4. The attitude sensor 41 is a prior art component that can be used to measure the rotation angle or position of an object, sense the angular change generated due to position changes, and convert it into a digital signal, which is then transmitted to an external data acquisition device. The function of the communication module is to achieve data transmission, communication connection, and control between devices. It can convert the deformation information of the elastic strain body 2 detected into a digital signal and transmit it to an external data acquisition device. The control circuit board 4 is also integrated with a waterproof plug 42 for connecting to an external communication line.

[0024] The mounting rod 6 is assembled and connected to the end of the metal housing 3 through a cavity cover 61. A perforation is opened at the center of the cavity cover 3 to expose the waterproof plug 42 of the electronic component unit, and a sealing structure is provided at the connection. The cavity cover 3 is hermetically connected to the metal housing 3. The end of the mounting rod 6 is a cross joint 62, which is used to connect and install a push rod, facilitating the deep-hole installation of the borehole stress gauge and capable of adjusting the installation angle of the stress gauge.

[0025] When the electronic borehole stress gauge disclosed in this utility model patent is applied, a drilling device is used to drill a hole in the roadway rock wall. The inner diameter of the hole needs to be the same as the outer diameter of the middle convex part of the elastic strain body 2 of the electronic borehole stress gauge. After the hole is drilled, the communication line of the borehole stress gauge is connected. A push rod is used to connect the cross joint 62 of the mounting rod 6 to send the stress gauge to the bottom of the hole. After the stress gauge is pushed in place, the attitude of the stress gauge is adjusted according to the information fed back by the attitude sensor 41 received by the external data acquisition device. After the adjustment is completed, the installation of the stress gauge is completed.

[0026] The above content is only a preferred embodiment of the present utility model creation, and it cannot be used to limit the scope of implementation of the present utility model creation. That is, all simple equivalent changes and modifications made according to the claims of the present utility model creation and the description content of the utility model creation still fall within the scope covered by the present utility model creation.

Claims

1. An electronic drilling stress gauge, characterized in that The borehole stress gauge includes a cylindrical base. The base is a polyhedron structure. One end of the base is connected to a conical head, and the other end is connected to an electronic component unit. A group of elastic strain bodies are installed on the outer peripheral surface of the base, or multiple groups of elastic strain bodies are installed in a circumferentially evenly distributed manner. The elastic strain bodies are electrically connected to the electronic component unit, and an installation rod is connected to the end face of the electronic component unit.

2. The electronic borehole stress gauge according to claim 1, characterized in that, A flexible sheath is integrally coated outside the elastic strain bodies of the borehole stress gauge.

3. The electronic borehole stress gauge according to claim 2, wherein, The middle of the upper side of the elastic strain body bulges outward to form a pressure-bearing part, and the two ends of the bottom side bulge downward to form support feet. A deformation cavity is formed between the support feet at both ends. Installation holes are respectively opened at both ends of the elastic strain body.

4. The electronic borehole stress gauge according to claim 3, wherein A cavity is arranged along the axis of the base. Inner threaded holes and set screw positioning holes are opened at both ends of each face of the base, and a wire passing hole is opened in the middle. The position of the inner threaded hole corresponds to the position of the installation holes at both ends of the elastic strain body. The wire passing hole communicates with the cavity along the axis of the base. The signal lines of the elastic strain bodies are electrically connected to the electronic component unit through the cavity along the axis of the base.

5. An electronic drilling stress gauge according to claim 4, characterized in that The electronic component unit includes a metal housing. A control circuit board is assembled inside the metal housing. An attitude sensor and a communication module are integrated on the control circuit board. A waterproof plug for connecting a communication line is exposed at the end of the metal housing.

6. The electronic borehole stress gauge according to claim 5, characterized in that The installation rod includes a cross joint. The installation rod is assembled and connected to the end of the metal housing through a cavity cover. A through hole is opened at the center position of the cavity cover to expose the waterproof plug of the electronic component unit. The cavity cover is hermetically connected to the metal housing.

7. The electronic borehole stress gauge according to claim 6, wherein, A flexible rubber filler is filled in the gaps between multiple groups of elastic strain bodies of the base.

8. An electronic drilling stress gauge according to claim 1, characterized in that, The base is a regular hexagonal prism structure. Elastic strain bodies are arranged on six sides, four sides, two sides or one side of the outer periphery of the base.

Images