CN104612657A - Device for determining Q, S and T values in combined mode - Google Patents

Abstract

The invention relates to a device for joint determination of QST value, which belongs to the technical field of mine safety. Including the auger rod system, drilling cuttings collection bag with holes, gravity sensor, air pump and data collector, the auger rod system includes the connected first auger rod and auxiliary auger rod, the middle part of the inner cavity of the first auger rod There is a hollow cylinder body, and the inner wall of the middle part of the cylinder body is provided with a chuck for fixing the position of the bottom end of the piston. A temperature sensor is provided in the casing adjacent to the outer wall and cavity of the first auger rod, the inner wall of the first auger rod is provided with an air supply pipe connected to the cylinder body, and the inner cavity of the first auger rod is also provided with a measuring tube. Through the cylinder and the inside of the piston, a hole sealer is installed at the end of the last auxiliary auger pipe; the drilling chip collection bag with holes is set on the gravity sensor, the air pump is connected to the air supply pipe, and the data collector is connected to the end of the measuring pipe , suitable for mine outburst prevention prediction.

Description

Device for joint determination of QST value

technical field

The invention belongs to the technical field of mine safety, in particular to a device for jointly measuring QST values.

Background technique

As the main energy source in our country, the development of coal and the safety of coal mines have always been the focus of research. However, the occurrence and mining conditions of underground coal seams are complex, and the gas content of coal seams in my country is generally high. More than 50% of the coal seams are high-gas coal seams, and high-outburst mines account for 44% of the total number of mines in the country. Coal and gas outbursts are serious and the risk factor is high. Disasters and accidents caused by coal mine gas explosions and high-temperature operations are common. Therefore, coal mining units must carry out outburst predictions and take effective control measures.

At present, there are many methods for predicting the risk of coal and gas outburst in underground working faces of coal mines or for testing the effects of outburst prevention measures, among which the composite index method is the most commonly used to predict the risk of outburst in coal roadway driving faces. The indicators of the composite index method include the initial velocity of gas gushing (Q value) and the amount of drilling cuttings (S value). In the actual measurement process, the S value is usually collected by drilling the hole first, then the drill pipe is withdrawn, and the hole sealing device is sent into the hole. After the hole is sealed, the Q value is measured. The initial velocity of gas gushing is the instantaneous value 2 minutes after the end of drilling, which has extremely high requirements and restrictions on the measurement time. However, in actual operation, the process from exiting the drill pipe to sending it into the hole sealing device to achieve hole sealing is cumbersome and time-consuming , and after the Q value is measured, it is necessary to withdraw from the hole sealer and feed the drill pipe again to continue drilling, and so on. Such a measurement process has a huge workload, and if the time is not properly grasped, an effective Q value cannot even be measured. During the pneumatic drilling process, the drill pipe rubs against the coal wall at high speed, and the temperature rises sharply. At the same time, air is continuously sent into the borehole during the drilling process. When it is a certain value, it is very easy to cause coal combustion or gas explosion. Therefore, real-time measurement of the temperature (T value) in the borehole during the drilling process plays an important role in preventing hidden dangers in mine safety. However, the current method is to independently measure the Q value, S value, and T value. In order to better predict the outburst risk of coal roadway driving face, a device that can jointly measure the QST value is urgently needed.

Contents of the invention

In order to overcome the shortcomings in the prior art that the drilling tool cannot be sealed and the Q, S, and T values need to be measured separately, the present invention provides a device for jointly measuring the QST value, which can realize the measurement of the Q value by sealing the hole, and by A single device realizes the combined determination of the three values of Q, S, and T.

The technical solution adopted by the present invention to solve the technical problem is: a device for jointly measuring the QST value, including an auger drill pipe system, a drill cuttings collection bag with holes, a gravity sensor, an air pump and a data collector, and the data collector includes a gas flow meter and a wireless communication device, the auger rod system includes a first auger rod and several sections of auxiliary auger rods, the auxiliary auger rod is connected to the tail of the first auger rod, and the middle part of the inner cavity of the first auger rod is provided with a hollow The cylinder body has an opening at the front end and a closed rear end. The cylinder body is fixed by the connecting bar unit. The inner wall side of the middle part of the cylinder body is provided with a chuck for limiting the final position of the piston retraction. The front part of the piston is a cone. body, the rear part of the piston is a cylinder, the outer diameter of the cylinder matches the inner diameter of the cylinder body, the front end of the piston is a piston cavity that matches the piston formed by a choke sleeve and the first auger rod, and the piston cavity There is a measuring cavity at the front end, which is used to accommodate the gas gushed out during the drilling of the auger drill pipe system. A temperature sensor capable of wireless communication is installed in the choke sleeve adjacent to the outer wall of the first auger drill pipe and the measuring cavity. , the inner wall of the first auger rod is provided with an air supply pipe connected with the cylinder body, the inner cavity of the first auger rod is also provided with a measuring tube, the measuring tube runs through the inside of the cylinder body and the piston, and the inner cavity of the auxiliary auger rod is provided with There are air supply pipes and measuring pipes respectively connected with the air supply pipe and measuring pipe of the first auger drill pipe, and the outer side of the measuring pipe is provided with a fixing strip unit, and the measuring pipe is fixed to the inner cavity of the auxiliary auger drilling pipe through the fixing strip unit The middle part; the tail of the last auxiliary auger rod is provided with a hole sealer; the drill cuttings collection bag with holes is arranged on the gravity sensor to collect all the drill cuttings discharged during the drilling process of the auger rod system; the said The air pump is connected with the air delivery pipe, and the air pump inflates or draws air to the cylinder body through the air delivery pipe; the data collector is connected with the tail of the measuring tube and the gravity sensor.

Specifically, the connecting bar unit includes three connecting bars distributed around the outer wall of the cylinder and forming an angle of 120° with each other.

Specifically, the fixing bar unit includes three fixing bars distributed around the outer wall of the measuring tube and forming an included angle of 120° with each other.

Further, there are three air supply pipes, which are respectively arranged in the middle of the three fixing strips attached to the inner wall of the auger rod.

Preferably, three fixing bar units are arranged in each section of auxiliary auger rods with a length of 1 m, which are respectively located at 0.2 m, 0.5 m and 0.8 m from the port of the auxiliary auger rod.

Preferably, the length of the contact portion between the fixing strip and the measuring tube is 20 mm.

Further, the wireless communication device is an nRF905 multi-channel single-chip transceiver chip.

Further, the material of the first auger rod and the auxiliary auger rod is low-chromium-nickel oxidation-resistant steel.

Further, the outer diameter of the auger rod system is 42 mm, the outer diameter of the hole sealer gradually increases from the top to the bottom, and the maximum outer diameter of the hole sealer is 45 mm.

Preferably, the length of the first auger drill rod is 2m, and the length of the measuring cavity is 0.5m.

The beneficial effects of the present invention are: the Q value can be measured under the sealing condition, and the Q value, S value and T value can be recorded conveniently, accurately and integratedly in real time. When the measured value is abnormal, corresponding protective measures can be taken in time, effectively Improve the safety of coal mine drilling, ensure the personal safety of the staff and the safety of the mine. The invention is suitable for mine safety development, especially suitable for mine outburst prevention prediction.

Description of drawings

Fig. 1 is the structural representation of auger rod system of the present invention;

Fig. 2 is the sectional view of the first auger rod of the present invention;

Fig. 3 is a cross-sectional schematic diagram of Fig. 2;

Fig. 4 is a structural schematic view when the piston of the auger rod system of the present invention is pushed forward to realize air closure;

Fig. 5 is a schematic structural view of the present invention in use;

Among them, 1 is the auger pipe system, 2 is the cylinder body, 3 is the piston, 4 is the choke sleeve, 5 is the measuring tube, 6 is the temperature sensor, 7 is the hole sealer, 8 is the drilling cuttings collection bag with holes, 9 Is a gravity sensor, 10 is an air pump, 11 is a data collector, 12 is a connecting bar, 13 is a chuck, 14 is a fixing bar, and 15 is an air supply pipe.

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 5, the device for joint determination of the QST value of the present invention includes an auger drill pipe system 1, a drilling cuttings collection bag with holes 8, a gravity sensor 9, an air pump 10 and a data collector 11, and the data collector 11 Including gas flow meter and wireless communication device,

The auger rod system includes a first auger rod and several sections of auxiliary auger rods, the auxiliary auger rod is connected to the tail of the first auger rod, and a hollow cylinder 2 is provided in the middle of the inner cavity of the first auger rod, The front end is provided with an opening and the rear end is closed. From the perspective of the auger drill pipe system, the port where the cylinder body matches the top of the drill pipe system is the front end of the cylinder body. The cylinder body 2 is fixed by the connecting bar unit, and the connecting bar The unit includes three connecting bars that are distributed around the outer wall of the cylinder and form an angle of 120° with each other, that is, the cylinder body and the inner cavity of the drill pipe are connected by connecting bars 12; 13 is used to limit the final position of the retraction of the piston 3, the chuck 13 is in contact with the bottom of the piston 3, the front of the piston is a cone, the rear of the piston is a cylinder, and the outer diameter of the cylinder is the same as the inner diameter of the cylinder 2 Matching, the front end of the piston 3 is a piston cavity matched with the piston formed by the choke sleeve 4 and the first auger rod, the cylinder body 2 is filled with gas, the rear part of the piston 3 is put into the cylinder body, and the front The part is located outside the cylinder body, and there is a measuring cavity at the front end of the piston cavity, which is used to accommodate the gas gushing out when the auger drill system is drilling, so that it can be led out from the measuring tube. Preferably, the first auger The length of the rod is 2m, and the length of the measuring cavity is 0.5m, at this time, the gas discharge effect is better. A temperature sensor 6 capable of wireless communication is provided in the choke sleeve 4 adjacent to the outer wall of the first auger rod and the measurement cavity, the inner wall of the first auger rod is provided with an air delivery pipe 15 communicating with the cylinder body 2, and the first auger rod The inner cavity of the drill pipe 1 is also provided with a measuring tube 5, which runs through the cylinder body 2 and the inside of the piston 3; After the hole is sealed, the air pump 10 is used to fill the cylinder body 2 with gas, and the air pressure in the cylinder body pushes the piston 3 into close contact with the choke sleeve 4. At this time, the piston 3 stretches out, and its bottom end is not in contact with The chuck 13 is in contact, and the wind choke sleeve 4 can block the air flow between the front end of the drill pipe and the outside through the drill hole, so that a gas measurement chamber isolated from the outside can be formed in front of the first auger drill pipe, and the data collector 11 connected to the measurement pipe can The initial gas gushing velocity Q value can be measured. When the gas is pumped from the cylinder 2 after the measurement, the external air pressure will push the piston 3 back to the cylinder. At this time, the piston retracts. When retracting to the final position, the chuck 13 and the piston 3 The bottom ends are in contact with each other to prevent the piston 3 from retracting too much.

In order to quickly inflate and pump the cylinder body, there are three air supply pipes, as shown in Figure 3, the three air supply pipes are respectively arranged in the middle of the three fixed strips attached to the inner wall of the auger rod, that is, three air supply pipes They are distributed at an angle of 120° to each other. The air supply pipe is in the middle of the fixing bar, which is equivalent to a hollow design.

The inner cavity of the auxiliary auger rod is provided with an air supply pipe and a measuring tube respectively connected with the air supply pipe of the first auger rod and its measuring tube, that is, the inner cavity of the auxiliary auger rod is provided with an air supply pipe and a measuring tube, Its air supply pipe is connected with the air supply pipe of the first auger drill pipe, and its measuring tube is connected with the air supply pipe of the first auger drill pipe; the outer side of the measurement pipe is provided with a fixing bar unit at intervals, and the measuring tube is fixed on the The middle part of the inner cavity of the auxiliary auger drill pipe, the fixed strip unit includes three fixed strips distributed around the outer wall of the measuring tube and forming an angle of 120° with each other. The fixed strips play the role of fixing the measuring tube, and their radial distribution is the same as that of the connecting strips , 3 sections of fixing strips are arranged in each section of 1m auger pipe, located at 0.2m, 0.5m and 0.8m respectively. The length of the contact part between the fixing strip and the measuring tube is 20mm, that is, the length of the fixing strip between the bottom of the air supply pipe and the measuring tube in Fig. 2 is 20mm. When any two sections of auger pipes are connected end-to-end, the measuring tube realizes an effective airtight butt joint. The tail of the last auxiliary auger rod is provided with a hole sealer 7, the front part of which can be connected to the auger rod, and the rear part can be connected to the drilling machine. Coal cuttings are fastened in the borehole to achieve hole sealing;

When in use, the gravity sensor 9 is installed at the opening of the drill hole, and the drill cuttings collection bag 8 with holes is hung on the gravity sensor. There are two holes on the collection bag, the upper hole is used for the drill pipe to pass through, and the lower hole is used for discharge. Drilling cuttings, after completing a measurement, all the cuttings can be released from the hole below, and then continue drilling to collect the next drilling cuttings;

The air pump is connected to the air supply pipe in the drill pipe through a hose, which can inflate and pump air into the cylinder to push forward and retreat the piston in a timely manner. The gas flowmeter of the data collector 11 is connected to the tail of the measuring tube through the hose. Connected, the holes are sealed through the hole sealer, and the gas measurement chamber is formed in the front section of the auger pipe system 1, and the initial velocity Q value of the gas gushing can be smoothly measured through the measurement tube; the drill cuttings collection bag with holes is set on the gravity sensor 9 , used to collect all the cuttings discharged during the drilling process of the auger drill pipe system, and then measure the cuttings amount S value through the gravity sensor 9, and transmit it to the data collector 11; the temperature sensor 6 can detect the temperature T in the borehole in real time value, and send the temperature value of the drill bit to the data collector 11 through its wireless transmission device, so that the data collector 11 can record the T value in real time.

The temperature sensor 6 is capable of wireless communication, that is, it has a wireless communication device, for example, nRF905 multi-channel single-chip transceiver chip can be used, and wireless radio frequency transmission technology can be used to realize real-time transmission of signals.

In order to ensure the service life and safety of the auger rod system, the material of the first auger rod and the auxiliary auger rod is low-chromium-nickel oxidation-resistant steel.

In order to ensure the safety of drilling and the accuracy of measurement during use of the present invention, the outer diameter of the auger rod system is selected as a standard size φ42mm, and the outer diameter of the hole sealer increases gradually from the top to the bottom, and the maximum outer diameter of the hole sealer is 45mm, the diameter of the hole sealer is slightly larger than the outer diameter of the auger rod system to ensure complete sealing.

The specific implementation steps are as follows: A. Install the gravity sensor outside the drilling position, hang the cuttings collection bag with holes on the gravity sensor, pass the auger rod system through the cuttings collection bag with holes, and place the air pump 10 and the data collector 11, constructing a borehole with a diameter of φ42mm in the coal mass ahead of the excavation face;

B. When the drilling is about to reach the predetermined gas gushing initial velocity measurement depth, such as 10m, connect the 45mm diameter hole sealer to the auger rod system and drill into the coal body. When the auger rod system cannot continue to drill or it is difficult to drill , the hole sealing effect can be achieved by fastening the cut coal chips in the drill hole;

C. Connect the air pump to the air supply pipe, fill the cylinder with air, and the air pressure in the cylinder will push the front of the piston into the cavity of the piston and make close contact with the cavity wall, so that the front of the drill pipe is in the seal of the hole sealer. Under the action of the hole and the air-closing action of the wind-blocking sleeve, a gas measurement chamber isolated from the outside is formed;

D. Connect the data collector to the measuring tube to measure the Q value of the initial velocity of gas gushing out; during the whole drilling process, the temperature T value in the borehole is measured in real time through the temperature sensor and wirelessly transmitted to the data collector; in addition , the drilling cuttings are dredged by the spiral blades to the outside of the drilling hole, and all fall into the drilling cuttings collection bag with holes. The gravity sensor transmits the measured cuttings amount S value to the data collector, and stops drilling after drilling 1m. When the data is stable, measure the S value of the cuttings amount once. It is worth noting that after each measurement of the cuttings amount, the hole under the cuttings collection bag with holes needs to be opened to release all the cuttings measured in the previous measurement; and record all the data into Table 1;

E. After the measurement is finished, reverse the drilling rig to withdraw the hole sealer and all the auger rods from the drilling hole.

Table 1 Data Recording Table

Claims (10)

1. The device for jointly measuring the QST value is characterized in that it comprises an auger drill pipe system (1), a drilling cuttings collection bag with holes (8), a gravity sensor (9), an air pump (10) and a data collector (11) , the data collector (11) comprises a gas flow meter and a wireless communication device, The auger rod system includes a first auger rod and several sections of auxiliary auger rods, the auxiliary auger rod is connected to the tail of the first auger rod, and a hollow cylinder (2 ), the front end is provided with an opening and the rear end is closed, the cylinder body (2) is fixed by the connecting bar unit, and the inner wall side of the middle part of the cylinder body (2) is provided with a chuck (13), and the chuck (13) is used In the final position where the retraction of the piston is limited, the front of the piston is a cone, and the rear of the piston is a cylinder. The outer diameter of the cylinder matches the inner diameter of the cylinder (2), and the front end of the piston (3) is a wind blocking sleeve (4) A piston cavity matched with the piston is formed around the first auger rod. There is a measuring cavity at the front end of the piston cavity. A temperature sensor (6) capable of wireless communication is provided in the air jacket (4) adjacent to the outer wall of the first auger rod and the measurement cavity, and the inner wall of the first auger rod is provided with an air supply pipe connected to the cylinder (2) (15), the inner cavity of the first auger drill rod (1) is also provided with a measuring tube (5), and the measuring tube (5) runs through the inside of the cylinder (2) and the piston (3); in the inner cavity of the auxiliary auger drill rod There are air supply pipes and measuring pipes respectively connected with the air supply pipes and measuring pipes of the first auger drill pipe. The outer sides of the measuring pipes are provided with fixing strip units, and the measuring pipes are fixed inside the auxiliary auger drilling pipe through the fixing strip units. In the middle of the cavity, a hole sealer (7) is provided at the tail of the last auxiliary auger pipe; The drill cuttings collection bag with holes is arranged on the gravity sensor (9) for collecting all the drill cuttings discharged during the drilling process of the auger drill pipe system, and the air pump (10) is connected with the air delivery pipe (15), The data collector (11) is connected with the tail of the measuring tube and the gravity sensor. 2 . The device for joint determination of QST value according to claim 1 , wherein the connecting bar unit comprises three connecting bars distributed around the outer wall of the cylinder and forming an angle of 120° with each other. 3 . 3. The device for joint determination of the QST value according to claim 1, wherein the fixed strip unit comprises three fixed strips distributed around the outer wall of the measuring tube and forming an angle of 120° with each other. 4. The device for joint determination of QST value as claimed in claim 3, characterized in that there are three air supply pipes, which are respectively arranged in the middle of three fixing strips attached to the inner wall of the auger rod. 5. The device for joint determination of QST value as claimed in claim 1 or 2 or 3 or 4, is characterized in that, in the auxiliary auger drill rod that each section length is 1m, 3 fixing bar units are arranged, respectively located at a distance from the section Auxiliary auger pipe port 0.2m, 0.5m and 0.8m. 6. The device for joint determination of QST value as claimed in claim 5, wherein the length of the contact portion between the fixing strip and the measuring tube is 20mm. 7. The device for joint determination of QST value as claimed in claim 1, wherein said wireless communication device is nRF905 multi-channel single-chip transceiver chip. 8 . The device for joint determination of QST value as claimed in claim 1 , wherein the material of the first auger rod and the auxiliary auger rod is low-chromium-nickel oxidation-resistant steel. 9. The device for jointly measuring the QST value as claimed in claim 8, wherein the outer diameter of the auger rod system is 42mm, and the outer diameter of the hole sealer increases gradually from the top to the bottom, and the maximum outer diameter of the hole sealer is The diameter is 45mm. 10. The device for joint determination of QST value as claimed in claim 1, wherein the length of the first auger drill rod is 2m, and the length of the measuring cavity is 0.5m.