CN108798649B

CN108798649B - A temperature measuring device while drilling for coal spontaneous combustion temperature detection

Info

Publication number: CN108798649B
Application number: CN201810347533.5A
Authority: CN
Inventors: 任万兴; 郭庆; 石晶泰; 赵乾坤
Original assignee: Xuzhou Ji'an Mining Technology Co ltd; China University of Mining and Technology Beijing CUMTB
Current assignee: Xuzhou Ji'an Mining Technology Co ltd; China University of Mining and Technology Beijing CUMTB
Priority date: 2018-04-18
Filing date: 2018-04-18
Publication date: 2022-02-11
Anticipated expiration: 2038-04-18
Also published as: CN108798649A; WO2019200821A1

Abstract

A temperature measurement device while drilling for coal spontaneous combustion temperature detection, comprising a central rotary cavity and a signal transmission module, the signal transmission module is installed on the central rotary cavity through a positioning sleeve; the signal transmission module comprises a signal line, a signal output end, Communication cable, display, signal line, temperature sensor and signal receiving and wireless transmitting device, the temperature sensor is installed in the drill bit, the signal receiving and wireless transmitting device is connected to the temperature sensor through the signal line and installed on the last drill pipe farthest from the drill bit The signal output end is connected to the display through a communication cable, the center of the signal output end is provided with a conductive rod, the front end of the conductive rod is provided with a conductive hemisphere, the conductive hemisphere is in contact with the conductive ring, and the signal line is placed in the connected central rotary cavity and drill. In the rod, one end is connected with the inner ring of the conductive ring, and the other end is connected with the temperature sensor. The present invention is capable of monitoring real-time temperature within the borehole.

Description

While-drilling temperature measuring device for coal spontaneous combustion temperature detection

Technical Field

The invention relates to a temperature measurement while drilling device for detecting the spontaneous combustion temperature of coal, belonging to a coal spontaneous combustion temperature detection device.

Background

In the underground coal mine, coal spontaneous combustion is one of disasters affecting safe stoping of a working face, and a goaf is a coal spontaneous combustion frequent area. Because the goaf is in a closed space, the temperature of each part of the internal space of the goaf can not be measured in real time, the spontaneous combustion degree of the coal in the goaf is mostly inverted by adopting a gas detection method during field operation at present, and corresponding fire control measures are taken based on the inversion result. However, when the method is adopted, the method is influenced by underground coal mine wind flow, mining and geological occurrence, once the marker gas is detected, the residual coal enters a spontaneous combustion stage, the effect of preventing in advance cannot be achieved, the probability of fire occurrence is directly increased, and the investment of fire management is increased.

In order to solve the above problems, the temperature condition of the location where the fire is likely to catch fire can be monitored in advance, and direct temperature measurement using an optical fiber temperature measurement technology, a thermocouple technology, an infrared detection technology, and the like can be considered at present. However, in the light ray temperature measurement technology, optical fibers are laid in advance in a goaf or an easily-fired area, and the goaf temperature is measured in real time by using the light time domain reflection technology, and because the optical fibers are generally laid on a coal seam floor and are influenced by collapse of a coal seam roof and mine water, the problems that the optical fibers are broken by smashing, the optical fibers or a temperature sensing probe are soaked and the like often occur in the method; in addition, the method needs pre-embedding, and the internal temperature of an area which is not pre-embedded and is already on fire cannot be measured. And if the temperature is measured by extending a thermocouple into the drill hole, although the temperature of the ignition space can be measured sometimes, the operation is complicated, and the accuracy and the sensitivity are poor due to the influence of the condition of the surrounding rock of the drill hole and the poor thermal conductivity of the porous medium of the goaf. Finally, the infrared detection technology is only suitable for temperature measurement of areas with obvious surface temperature changes, and is not suitable for temperature detection of goafs or abandoned roadway areas under mines.

The temperature measurement while drilling tool for detecting the temperature of the underground goaf of the coal mine is a temperature measurement valve block arranged between a water change head and a drill rod and comprises a central rotary cavity and a signal transmission feedback component, wherein the connecting end of the water change head is inserted into a pipe joint at one end of the central rotary cavity, and the other end of the central rotary cavity is connected with the drill rod; the signal transmission feedback component is arranged on the central rotary cavity body in a matching way through a positioning sleeve, and a conducting ring is arranged in a cavity between the positioning sleeve and the central rotary cavity body at intervals; the signal transmission feedback component comprises a signal line I, a signal line II, a signal input end and a signal output end, and the temperature sensing cable, the signal input end and the signal output end are connected together through the signal line I and the signal line II. The method is convenient to operate, can detect the temperature distribution condition of the area, and can measure the temperature along the path of the drill hole when the drill rod deeply drills the hole, so that the temperature of the goaf and other ignition areas under the coal mine can be accurately detected, the prevention work can be performed in advance, and the probability of fire occurrence is reduced.

The principle of the temperature measurement while drilling tool is as follows: the temperature measurement valve block is connected between a water changing head and a drill rod of the drilling machine, during drilling, an electric signal is continuously input into the temperature measurement valve block from the outside through a signal input end, the electric signal is transmitted to a signal output end through a signal line I, a temperature sensing cable and a signal line II, when the temperature exceeds the set temperature of the temperature sensing cable, the temperature sensing cable is short-circuited, and a short-circuit signal can be output to an alarm component connected with the temperature sensing cable through the signal output end to send out an alarm. The temperature of a large-range working area can be monitored by different monitoring points in the same working area and by replacing temperature sensing cables with different detection temperatures at the same monitoring point, and a temperature network can be formed by a plurality of measuring points and used for guiding fire prevention and control in goafs and the like. The defects of the method are as follows: the temperature of the temperature sensing cable is determined, when the temperature reaches the set temperature of the temperature sensing cable, the temperature sensing cable is automatically fused, temperature measurement cannot be continued, namely, one-time temperature measurement is performed, and a detection result only indicates that the measured temperature is greater than the set temperature of the temperature sensing cable, but an accurate temperature value cannot be determined. Therefore, continuous temperature measurement cannot be achieved.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the while-drilling temperature measuring device for detecting the spontaneous combustion temperature of coal, which can monitor the real-time temperature in a drill hole, and the measured temperature is more accurate, stable, rapid and continuous.

The technical scheme adopted by the invention for solving the technical problems is as follows: the device comprises a water supply device, a drill rod, a temperature measuring device while drilling, a positioning sleeve, a conducting ring, a water supply device, a drill rod, a drill-following device and a temperature measuring device, wherein the drill rod is arranged between the water supply device and the drill rod; the signal transmission module comprises a signal wire, a signal output end, a communication cable, a display, a signal wire, a temperature sensor and a signal receiving and wireless transmitting device, wherein the temperature sensor is arranged in the drill bit, the signal receiving and wireless transmitting device is connected with the temperature sensor through the signal wire and is arranged outside the first-stage drill rod which is farthest away from the drill bit, the signal output end is outwards connected with the display through the communication cable, the signal output end is radially inserted from the outside corresponding to the position of the conducting ring and penetrates through the positioning sleeve, and the center of the signal output end is provided with a conducting rod, the front end of the conducting rod is provided with a conducting hemisphere, the front end surface of the conducting hemisphere is contacted with the annular outer surface of the conducting ring, a signal wire is arranged in the communicated central rotary cavity and the drill rod, and one end of the signal wire penetrates through the side wall of the central rotary cavity and is fixed on the inner ring of the conducting ring, and the other end of the signal wire is connected with the output end of the temperature sensor in the drill bit.

Compared with the prior art, the temperature measurement while drilling device for detecting the spontaneous combustion temperature of coal has the advantages that in the process of drilling, a sensor signal is transmitted to the conducting ring through the temperature sensor in the drill bit through the signal line, and the conducting ring is transmitted to the display through the conducting hemisphere, the conducting rod and the communication cable, so that the real-time temperature monitoring is realized; after drilling is finished, the drill pipe is connected with a signal wire through a signal receiving and wireless transmitting device attached to the outside of the last-stage drill pipe to obtain a sensor signal, the sensor signal is sent to receiving equipment in a wireless mode, and the receiving equipment displays the temperature change condition; the temperature measured in the rotary drilling process and after the rotary drilling process is more accurate, stable, rapid and continuous. The invention provides temperature detection equipment for preventing and treating spontaneous combustion of underground coal of a coal mine. The fundamental problem of coal spontaneous combustion prevention and control, namely temperature positioning, is solved. Once the coal spontaneous combustion dangerous area is accurately positioned, the development, change and other processes of the coal spontaneous combustion dangerous area can be comprehensively mastered, the coal spontaneous combustion prevention and control can be accurately guided, and meanwhile, the difficulty in selecting fire prevention and extinguishing materials is avoided. Therefore, the invention has the advantages of extremely high application prospect, great potential economic benefit and the like.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of an application of one embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a temperature measurement while drilling device according to an embodiment of the invention.

Fig. 3 is a schematic view of the last stage of drill pipe in fig. 2.

Fig. 4 is a view showing an installation structure of a signal line in the drill pipe of fig. 2.

Fig. 5 is a schematic view of the pouch of fig. 4.

In the figure: 1. the device comprises a drilling machine, 2, a water feeder, 3, a high-pressure water pipe, 4, a drill rod, 4-1, a last-stage drill rod, 5, a drill bit, 6, a fixing sleeve, 6-1, a ring piece, 6-2, a support rod, 6-3, an excircle, 7, a temperature measuring device while drilling, 10, a central rotary cavity, 20, a rotary bearing, 30, a positioning sleeve, 40, resin, 50, an insulator, 60, a conductive ring, 70, a signal output end, 71, a conductive rod, 72, a spring, 73, a conductive hemisphere, 80, a signal line, 81, a signal line connecting socket, 82, a protective sleeve, 90, a communication cable, 100, a display, 110, a temperature sensor, 120, a signal receiving device and a wireless transmitting device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.

As shown in figure 1, the temperature measurement while drilling device for detecting the spontaneous combustion temperature of coal is characterized in that the temperature measurement while drilling device 7 is installed between a water supply device and a drill rod 4, the water supply device comprises a water feeder 2 and a high-pressure water pipe 3, one end of the high-pressure water pipe 3 is connected with a water source, the other end of the high-pressure water pipe is connected with the water feeder 2, a drilling machine 1 and the drill rod 4 are coaxial and are respectively installed on the side portions of the water feeder 2 and the temperature measurement while drilling device 7, and the front end of the drill rod 4 is connected with a drill bit 5.

In the embodiment shown in fig. 2, the while-drilling temperature measuring device 7 includes a central rotary cavity 10 and a signal transmission module, the signal transmission module is installed on the central rotary cavity 10 by a positioning sleeve 30, a pair of rotary bearings 20 is disposed between the central rotary cavity 10 and the positioning sleeve 30, a conducting ring 60 is disposed at an interval in a cavity between the positioning sleeve 30 and the central rotary cavity 10, the conducting ring 60 is sleeved on the central rotary cavity 10, the diameter of an inner ring of the conducting ring 60 is greater than that of an outer ring of the central rotary cavity 10, an insulator 50 is filled between the conducting ring 60 and the central rotary cavity 10, and the material of the insulator 50 may be insulating nylon; the signal transmission module comprises a signal wire 80, a signal output end 70, a communication cable 90, a display 100, a signal wire 80, a temperature sensor 110 and a signal receiving and wireless transmitting device 120, wherein the temperature sensor 110 is arranged in the drill bit 5, the temperature sensor 110 is preferably arranged on the axis of the drill bit 5 in a penetrating way, the signal receiving and wireless transmitting device 120 is connected with the temperature sensor 110 through the signal wire 80 and is arranged outside the last-stage drill rod 4-1 (see figure 3) farthest away from the drill bit 5, the signal output end 70 is outwards connected with the display 100 through the communication cable 90, the position of the signal output end 70 corresponding to the conductive ring 60 is inserted from the outside in the radial direction and penetrates through the positioning sleeve 30, a conductive rod 71 is arranged in the center of the signal output end 70, a conductive hemisphere 73 is arranged at the front end of the conductive rod 71, the front end surface of the conductive hemisphere 73 is contacted with the annular outer surface of the conductive ring 60, the signal line 80 is arranged in the communicated central rotary cavity 10 and the drill rod 4, one end of the signal line 80 penetrates through the side wall of the central rotary cavity 10 and is fixed at the inner ring of the conducting ring 60, and the other end of the signal line is connected with the output end of the temperature sensor 110 in the drill bit 5.

As shown in fig. 4 and 5, the signal wire 80 is supported in the hollow cavity of the drill rod 4 through the fixing sleeve 6, the outer part of the fixing sleeve 6 is an outer circle 6-3 which is matched with the inner diameter of the drill rod 4, the ring member 6-1 through which the signal wire 80 passes is arranged in the center of the inner part of the fixing sleeve 6, and the ring member 6-1 is connected with the outer circle 6-3 through the supporting rod 6-2. The mounting position of the signal line 80, the stability of the working performance, and the prolonged service life can be improved.

Preferably, in order to ensure that the conductive hemisphere 73 and the outer ring of the conductive ring 60 can be always in stable contact, and the service life is prolonged, the conductive rod 71 is sleeved with the spring 72, and one end of the spring 72 abuts against the conductive hemisphere 73, and the other end is disposed on the inner wall of the signal output end 70. In order to better protect the signal line 80, the resin 40 is filled around the signal line 80, the insulator 50, the central revolving cavity 10 and the insulator 50; meanwhile, a protective sleeve 82 covers the part of the signal wire 80 in the hollow cavity of the drill rod 4, and a plurality of signal wires 80 can be connected through signal wire connecting sockets 81 according to the requirement of length.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.

Claims

1. A temperature-while-drilling device for coal spontaneous combustion temperature detection, installed between a water supply device and a drill pipe (4), the temperature-while-drilling device (7) comprising a central rotary cavity (10) and a signal transmission module, wherein the signal transmission module is fitted on the central rotary cavity (10) through a positioning sleeve (30), and a pair of rotary bearings (20) are arranged between the central rotary cavity (10) and the positioning sleeve (30), and A conductive ring (60) is spaced in the cavity between the positioning sleeve (30) and the central rotary cavity (10), the conductive ring (60) is sleeved on the central rotary cavity (10), and the conductive ring (60) The diameter of the inner ring is larger than the diameter of the outer ring of the central rotary cavity (10), and an insulator (50) is filled between the conductive ring (60) and the central rotary cavity (10); it is characterized by:

The signal transmission module includes a signal line (80), a signal output end (70), a communication cable (90), a display (100), a signal line (80), a temperature sensor (110) and a signal receiving and wireless transmitting device ( 120), the temperature sensor (110) is installed in the drill bit (5), the signal receiving and wireless transmitting device (120) is connected to the temperature sensor (110) through the signal line (80) and installed at the last farthest from the drill bit (5). Outside the grade drill pipe (4-1), the signal output end (70) is connected to the display (100) through the communication cable (90) outward, and the signal output end (70) corresponds to the position of the conductive ring (60) from the outside along the radial direction Insert and pass through the positioning sleeve (30), and the center of the signal output end (70) is provided with a conductive rod (71), the front end of the conductive rod (71) is provided with a conductive hemisphere (73), and the front surface of the conductive hemisphere (73) and the conductive ring The annular outer surface of (60) is in contact, the signal wire (80) is placed in the central rotary cavity (10) and the drill pipe (4) that communicate with each other, and one end of the signal wire (80) passes through the central rotary cavity (10) side The wall is fixed on the inner ring of the conductive ring (60), and the other end is connected to the output end of the temperature sensor (110) inside the drill bit (5). During drilling, the temperature sensor (110) inside the drill bit (5) is used to connect the sensor The signal is transmitted to the conductive ring (60) through the signal line (80), and the conductive ring (60) is transmitted to the display (100) through the conductive hemisphere (73), the conductive rod (71), and the communication cable (90); The signal receiving and wireless transmitting device (120) attached to the last stage drill pipe (4-1) is connected with the signal line (80) to obtain the sensor signal.

2. The temperature-measuring-while-drilling device for coal self-ignition temperature detection according to claim 1, characterized in that: the water supply device comprises a water feeder (2) and a high-pressure water pipe (3), and the high-pressure water pipe (3) ) is connected to the water source at one end, and the water feeder (2) at the other end. The drilling rig (1) and the drill pipe (4) are coaxial and installed on the sides of the water feeder (2) and the temperature-while-drilling device (7).

3 . The temperature-while-drilling device for detecting the spontaneous combustion temperature of coal according to claim 1 or 2 , wherein the temperature sensor ( 110 ) is installed through the axial line of the drill bit ( 5 ).

4. The temperature-while-drilling device for coal spontaneous combustion temperature detection according to claim 1 or 2, characterized in that: the signal line (80) is connected to an insulator (50) and a central rotating cavity (10) The resin (40) is filled around the space between the insulator (50) and the insulator (50).

5. A temperature measuring device while drilling for coal spontaneous combustion temperature detection according to claim 1 or 2, characterized in that: the signal line (80) is supported on the drill pipe (4) through a fixed sleeve (6) In the hollow cavity, the outside of the fixing sleeve (6) is an outer circle (6-3) which is suitable for the inner diameter of the drill pipe (4), and the inner center of the fixing sleeve (6) has a ring (6) through which the signal wire (80) passes. -1), the ring (6-1) and the outer circle (6-3) are connected by a strut (6-2).

6 . The temperature measurement while drilling device for coal spontaneous combustion temperature detection according to claim 5 , wherein the part of the signal wire ( 80 ) located in the hollow cavity of the drill pipe ( 4 ) is covered with protection. 7 . Sets (82).

7. A temperature-measuring-while-drilling device for coal self-ignition temperature detection according to claim 1 or 2, characterized in that: the conducting rod (71) is also covered with a spring (72), and the spring (72) ), one end is against the conductive hemisphere (73), and the other end is arranged on the inner wall of the signal output end (70).