A temperature measuring drill rod based on temperature measuring optical fiber is disclosed, which belongs to the technical field of temperature measurement and can be used for measuring the temperature of a drill rod in a coal

Abstract

The utility model relates to coal mine temperature measurement technical field, concretely is a kind of coal mine underground temperature measurement drill rod based on temperature measurement optical fiber, including drill rod body, and the bottom end integrally formed has drill bit, and the inside of drill rod body is provided with pressurizing cavity;Pressurizing mechanism, it is set in the inside middle portion of pressurizing cavity;Opening and closing mechanism, it is set in the inside below of pressurizing cavity;Heat conduction mechanism, it is set in the inside of pressurizing cavity and located below opening and closing mechanism.The utility model cooperates with the use of heat conduction mechanism and internal fluid, constructs the efficient heat conduction path from hole wall to optical fiber, significantly reduces the thermal resistance and thermal hysteresis caused by drill rod wall thickness, solves the technical problem of existing technology temperature measurement response delay, result distortion.

Description

Technical Field

[0001] This utility model relates to the field of coal mine temperature measurement technology, specifically a coal mine underground temperature measuring drill rod based on temperature measuring optical fiber. Background Technology

[0002] In coal mine fire zone monitoring, determination of coal spontaneous combustion range, and early prevention and forecasting projects, the collection of information inside the fire zone is a crucial technology. The borehole temperature information of the fire zone is of great guiding significance for the accurate location of local high-temperature fire sources.

[0003] For example, the coal mine underground temperature-measuring drill rod disclosed in authorization announcement number CN211115973U includes an internally continuous drill rod; the first end of the drill rod is open; and the second end of the drill rod has a detachable sealing part to plug the open. The beneficial effects of this utility model after adopting the above technical solution are: by using a drill rod with a special structure, combined with a fiber optic thermometer and a temperature-measuring fiber, the location of the high-temperature coal seam can be determined by actually detecting the peak position of the temperature inside the borehole. Simultaneously, it can also drill holes, realizing multiple uses for a single drill rod.

[0004] Although the aforementioned patent can achieve temperature measurement, its wall thickness is relatively thick in order to maintain the structural strength of the drill rod. As a result, the wall thickness causes the drill rod wall itself to generate significant thermal resistance and thermal capacity effects, resulting in a serious lag in the response of the temperature measurement system. In addition, the drill rod absorbs and dissipates heat, causing a large deviation between the internal temperature measured by the optical fiber and the actual temperature of the borehole rock wall. Utility Model Content

[0005] The purpose of this invention is to provide a temperature-measuring drill rod for underground coal mines based on temperature-measuring optical fiber, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A temperature-measuring drill pipe for underground coal mines based on temperature-measuring optical fibers, comprising:

[0008] The drill rod body has a drill bit integrally formed at its bottom end, and a pressure chamber is opened inside the drill rod body.

[0009] The pressurization mechanism is located in the middle of the inner side of the pressurization chamber;

[0010] The opening and closing mechanism is located on the lower inner side of the pressurization chamber;

[0011] The heat conduction mechanism is located inside the pressurization chamber and below the opening and closing mechanism.

[0012] Preferably, the pressurizing mechanism includes an end cap threaded to the top of the drill rod body, and a wire hole through the middle of the end cap. A temperature measuring fiber body is inserted inside the wire hole. A push block is fixedly connected to the bottom end of the temperature measuring fiber body. A pressurizing tube is fixedly connected to the upper left side of the drill rod body.

[0013] Preferably, the opening and closing mechanism includes a valve seat fixedly connected to the lower part of the drill pipe body, and a valve core slidably connected to the middle part of the valve seat. The top of the valve core is integrally formed with a boss, and a vertical connecting groove is opened between the middle part of the valve core and the boss. The top of the boss has inlet holes that communicate with the connecting groove through both sides, and the bottom of the valve core has outlet holes that communicate with the connecting groove through both sides.

[0014] Preferably, the opening and closing mechanism further includes crossbars fixedly connected inside the drill pipe body and located on both sides below the valve seat, and a mounting base fixedly connected between the two crossbars. The bottom end of the valve core extends to the outside of the valve seat and is fixedly connected to a sealing disc.

[0015] Preferably, limit blocks are fixedly connected to the top of both sides of the valve core, a spring is provided between the mounting base and the sealing plate, and the two ends of the spring abut against the sealing plate and the mounting base respectively. A wall groove is provided at the bottom of the drill rod body and above the valve seat.

[0016] Preferably, the heat conduction mechanism includes insertion holes evenly distributed on both sides of the bottom end inside the drill rod body, and a heat conduction pipe laterally fixed between the two insertion holes, with an opening through the middle of the heat conduction pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This new type of underground temperature-measuring drill pipe for coal mines, based on temperature-measuring optical fiber, constructs an efficient heat conduction path from the borehole wall to the optical fiber through the combined use of a heat-conducting mechanism and internal fluid. This significantly reduces the thermal resistance and thermal hysteresis caused by the thickness of the drill pipe wall, and solves the technical problems of slow temperature measurement response and distorted results in existing technologies. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the installation structure of the limiting block of this utility model;

[0021] Figure 3 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0022] Figure 4 For the present utility model Figure 1 Enlarged diagram of point B in the middle.

[0023] In the diagram: 1. Drill rod body; 2. Drill bit; 3. Pressurization chamber; 4. End cap; 5. Wire hole; 6. Temperature measuring fiber body; 7. Push block; 8. Pressurization tube; 9. Valve seat; 10. Valve core; 11. Boss; 12. Connecting groove; 13. Inlet hole; 14. Outlet hole; 15. Crossbar; 16. Mounting base; 17. Sealing plate; 18. Limiting block; 19. Spring; 20. Wall groove; 21. Insertion hole; 22. Heat conduction pipe; 23. Opening. Detailed Implementation

[0024] 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.

[0025] like Figure 1-4 As shown, this utility model provides a technical solution:

[0026] A temperature-measuring drill rod for underground coal mines based on a temperature-measuring optical fiber includes a drill rod body 1, with a drill bit 2 integrally formed at its bottom end. A pressure chamber 3 is formed inside the drill rod body 1, and a pressure mechanism is located in the middle of the inner side of the pressure chamber 3. The pressure mechanism includes an end cap 4 threaded to the top of the drill rod body 1, and a wire hole 5 penetrating the middle of the end cap 4. A temperature-measuring optical fiber body 6 passes through the wire hole 5. A pusher block 7, which has a spherical structure, is fixedly connected to the bottom end of the temperature-measuring optical fiber body 6. The pressurizing chamber 3 has a circular structure. A pressurizing pipe 8 is fixedly connected to the upper left side of the drill pipe body 1. The opening and closing mechanism is located on the lower inner side of the pressurizing chamber 3. The opening and closing mechanism includes a valve seat 9 fixedly connected to the lower inner side of the drill pipe body 1, and a valve core 10 slidably connected to the middle of the valve seat 9. A boss 11 is integrally formed on the top of the valve core 10. A vertical connecting groove 12 is opened between the valve core 10 and the middle of the boss 11. The top of the boss 11 has connecting grooves 12 through both sides. The valve core 10 has a connected inlet hole 13, and the valve core 10 has a discharge hole 14 that is connected to the connecting groove 12 through both sides of the bottom end. The opening and closing mechanism also includes a crossbar 15 fixedly connected inside the drill rod body 1 and located on both sides below the valve seat 9, and a mounting seat 16 fixedly connected between the two crossbars 15. The bottom end of the valve core 10 extends to the outside of the valve seat 9 and is fixedly connected to a sealing plate 17. Limiting blocks 18 are fixedly connected to the top of both sides of the valve core 10. A spring 19 is provided between the mounting seat 16 and the sealing plate 17. The two ends of the spring 19 abut against the sealing plate 17 and the mounting seat 16 respectively. A wall groove 20 is provided at the bottom end of the drill rod body 1 and above the valve seat 9. A heat conduction mechanism is provided inside the pressurization chamber 3 and below the opening and closing mechanism. The heat conduction mechanism includes an insertion hole 21 evenly distributed on both sides of the bottom end of the drill rod body 1, and a heat conduction pipe 22 that is horizontally fixedly connected between the two insertion holes 21. An opening 23 is provided through the middle of the heat conduction pipe 22.

[0027] In this embodiment, by using the heat conduction mechanism in conjunction with the internal fluid, an efficient heat conduction path is constructed from the hole wall to the optical fiber, which significantly reduces the thermal resistance and thermal hysteresis caused by the thickness of the drill pipe wall, and solves the technical problems of slow temperature measurement response and distorted results in the prior art.

[0028] Working principle: During drilling, the drill bit 2 at the bottom of the drill rod body 1 breaks the coal and rock mass. At this time, the opening and closing mechanism is in the closed state. When the drill rod reaches the predetermined depth and temperature measurement is required, high-pressure fluid is injected into the pressure chamber 3 through the pressure pipe 8. The pressure acts on the push block 7, pushing the temperature measuring fiber body 6 downward. At the same time, the pressure acts on the top of the boss 11. When the pressure overcomes the elastic force of the spring 19, it pushes the valve core 10 downward and drives the sealing disc 17 to compress the spring 19 until the lower end face of the limit block 18 abuts against the upper end face of the valve seat 9. At this time, the wall groove 20 is connected to the pressure chamber 3. The liquid enters through the inlet hole 13 and passes through the connecting groove 12 into the outlet hole 14. Then it enters the heat-conducting pipe 22 through the opening 23. Since both ends of the heat-conducting pipe 22 are connected to the insertion hole 21, the liquid fills the inside of the heat-conducting pipe 22 and forms a stable heat-conducting environment. At this time, the heat of the high-temperature coal body is efficiently conducted to the temperature-sensing fiber body 6 through the insertion hole 21 and the liquid in the heat-conducting pipe 22. The high-temperature point can be accurately located by measuring the temperature peak. After the temperature measurement is completed, the pressure is removed, and the valve core 10 is reset and resealed under the action of the spring 19. The temperature-sensing fiber body 6 can be retracted for subsequent operations.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A temperature measuring drill rod for use in a coal mine based on a temperature measuring optical fiber, characterized in that: include The drill rod body (1) has a drill bit (2) integrally formed at its bottom end, and a pressure chamber (3) is opened inside the drill rod body (1). The pressurization mechanism is located in the middle of the inner side of the pressurization chamber (3); The opening and closing mechanism is located on the lower inner side of the pressurization chamber (3); The heat conduction mechanism is located inside the pressurization chamber (3) and below the opening and closing mechanism. The heat conduction mechanism includes insertion holes (21) evenly distributed on both sides of the bottom end of the drill rod body (1) and heat conduction pipes (22) horizontally fixed between the insertion holes (21) on both sides. An opening (23) is opened through the middle of the heat conduction pipes (22).

2. The underground temperature-measuring drill pipe for coal mines based on temperature-measuring optical fiber according to claim 1, characterized in that: The pressurizing mechanism includes an end cap (4) threaded to the top of the drill rod body (1) and a wire hole (5) through the middle of the end cap (4). A temperature measuring fiber body (6) is inserted inside the wire hole (5). A push block (7) is fixedly connected to the bottom end of the temperature measuring fiber body (6). A pressurizing tube (8) is fixedly connected to the upper left side of the drill rod body (1).

3. A coal mine underground temperature measuring drill pipe based on temperature measuring optical fiber according to claim 1, characterized in that: The opening and closing mechanism includes a valve seat (9) fixedly connected to the lower part of the drill rod body (1) and a valve core (10) slidably connected to the middle part of the valve seat (9). The top of the valve core (10) is integrally formed with a boss (11). A vertical connecting groove (12) is opened between the middle part of the valve core (10) and the boss (11). An inlet hole (13) communicating with the connecting groove (12) is opened through both sides of the top of the boss (11). An outlet hole (14) communicating with the connecting groove (12) is opened through both sides of the bottom of the valve core (10).

4. A coal mine underground temperature measuring drill rod based on temperature measuring optical fiber according to claim 3, characterized in that: The opening and closing mechanism also includes a crossbar (15) fixedly connected inside the drill pipe body (1) and located on both sides below the valve seat (9), and a mounting seat (16) fixedly connected between the two crossbars (15). The bottom end of the valve core (10) extends to the outside of the valve seat (9) and is fixedly connected to a sealing disc (17).

5. A coal mine underground temperature measuring drill rod based on temperature measuring optical fiber according to claim 4, characterized in that: Limiting blocks (18) are fixedly connected to the top of both sides of the valve core (10). A spring (19) is provided between the mounting seat (16) and the sealing disc (17). The two ends of the spring (19) abut against the sealing disc (17) and the mounting seat (16) respectively. A wall groove (20) is provided at the bottom of the drill rod body (1) and above the valve seat (9).

Images