Fixed-point closed sampling device for underground coal seam of coal mine

Abstract

The invention discloses an underground coal mine coal seam fixed-point closed sampling device which comprises an outer cylinder, an inner cylinder is slidably arranged in the outer cylinder, a storage cavity is formed in the inner cylinder, one end of the inner wall of the inner cylinder is fixedly connected with a sealing check block, and a cooling channel is further formed in the inner cylinder; the drill bit part is arranged on the outer wall of the outer cylinder; the layout piece is fixedly connected to the inner wall of one end of the inner cylinder; one end of the connector is connected with the outer cylinder, and the other end of the connector is connected with an external drill rod; and the sealing piece is arranged on the outer wall of the stock layout piece.

Description

Technical Field

[0001] The invention relates to the field of coal seam sampling, and in particular to a fixed-point closed sampling device for coal seams in underground coal mines. Background Art

[0002] The development of coal mines has evolved from the original traditional coal mining stage to today's modern mechanized coal mining stage, which has greatly increased coal production and excavation speed. Sampling and testing before formal coal mining is particularly important. The current sampling operation is to conduct fixed-point closed sampling of coal seams. However, the existing sampling device cannot maintain the normally closed effect within the device during drilling after the position is determined, and the airtightness inside the device is lost, resulting in impurities entering during the drilling process and causing blockage. In addition, due to the need to take into account the overall structural integrity and stability of the coal seam, the sampling process is relatively slow. Therefore, the coal sample needs to undergo a long period of friction during the sampling process, which causes its own temperature to rise slightly, affecting the overall quality of the coal sample and causing inconvenience for subsequent testing.

[0003] Therefore, a fixed-point closed sampling device for coal seams in underground coal mines is needed to solve the above technical problems. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a fixed-point closed sampling device for coal seams in underground coal mines, comprising:

[0005] The outer cylinder has an inner cylinder slidably disposed therein, a storage cavity is formed inside the inner cylinder and a sealing stopper is fixedly connected to one end of the inner wall thereof, and a cooling channel is also provided inside the inner cylinder;

[0006] A drill bit, arranged on the outer wall of the outer tube;

[0007] A sample arrangement member, fixedly connected to the inner wall of one end of the inner cylinder;

[0008] A joint, one end of which is connected to the outer cylinder, and the other end of which is connected to an external drill pipe; and

[0009] A sealing member is arranged on the outer wall of the sample discharging member.

[0010] Further, as a preference, the drill bit component comprises: an outer drill, fixedly connected to the outer wall of the outer tube via a connecting seat, an exhaust duct is opened on the outer drill, the exhaust duct can be connected to the cooling duct, and an inner drill is detachably threadedly connected to the outer drill.

[0011] Further, preferably, the inner drill comprises:

[0012] An injection port is arranged inside the inner drill;

[0013] A sampling part is integrally fixedly connected to one end of the inner drill, a V-shaped double channel is opened in the sampling part, one end of the V-shaped double channel is connected to the injection port, and the other end passes through the side wall of the sampling part and is connected to the storage cavity, and the outer wall of the sampling part is slidably connected to the sealing block; and

[0014] The sealing part is arranged at an end of the sampling part away from the inner drill.

[0015] Further, as a preference, the sample arrangement component comprises:

[0016] A concave cylinder seat, the outer wall of which is fixedly connected to the inner wall of one end of the inner cylinder; and

[0017] The sample row tube is arranged inside the concave cylinder seat and passes through the concave cylinder seat. One end of the sample row tube is connected to the storage cavity, and the other end is connected to a fixing seat. The fixing seat is provided with a connecting port.

[0018] Further, as a preference, the sample row tube is a double-tube design of an inner tube and an outer tube, an air duct is formed between the inner tube and the outer tube, a material channel is formed inside the inner tube, a valve is provided on the outer wall of the outer tube, the valve connects the air duct with a ramp connected to the outer wall of the outer tube, the end of the ramp away from the valve is connected to the cooling channel, the air duct and one end of the material channel are both connected to the storage chamber, the other end of the air duct is connected to the external air supply part through the connecting port, and the other end of the material channel is connected to the discharge port.

[0019] Further, preferably, the sealing element comprises:

[0020] A stabilizing seat, the outer wall of which is fixedly connected to the inner wall of the joint, and the inner wall of which is slidably connected to the outer wall of the sample discharge tube; and

[0021] The sliding seat has an outer wall that is slidably connected to the inner wall of the outer cylinder, and the inner wall is fixedly connected to the outer wall of the sample row tube. A through hole is opened on the stable seat, and a spring that is sleeved on the outer wall of the sample row tube is connected between the stable seat and the sliding seat. An induction chip is arranged on one end of the sliding seat close to the concave cylinder seat.

[0022] Further, as a preference, the through port is communicated with an external water supply portion, and a water cavity is formed between the stabilizing seat and the sliding seat.

[0023] Further, preferably, the sensing chip can control the opening and closing of the valve.

[0024] Compared with the prior art, the present invention provides a fixed-point closed sampling device for coal seams in underground coal mines, which has the following beneficial effects:

[0025] The present invention can ensure the airtightness of the device during the drilling process to prevent impurities from entering and causing blockage; the present invention can control the temperature in the storage chamber to reach a constant state during the sampling process to avoid the increase in the temperature of the coal sample due to long-term friction during the slow sampling process, thereby affecting the overall quality of the coal sample and causing inconvenience for subsequent detection; the present invention can ensure the stability of the coal sample taken during the drilling withdrawal process to prevent the coal sample from being in contact with the outside world for a long time, causing its own characteristics to change, resulting in a decrease in detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a fixed-point closed sampling device for coal seams in underground coal mines;

[0027] Figure 2 This is a schematic diagram of the drill bit structure of a fixed-point closed sampling device for coal seams in underground coal mines;

[0028] Figure 3 It is a schematic diagram of the structure of a sample arrangement device for fixed-point closed sampling of coal seams in underground coal mines;

[0029] Figure 4 This is a state diagram of a drill bit when sampling in a fixed-point closed sampling device for coal seams in underground coal mines;

[0030] Figure 5 This is a state diagram of a drill bit component of a fixed-point closed sampling device for coal seams in underground coal mines when not sampling;

[0031] Figure 6 This is a state diagram of the sample arrangement parts of a fixed-point closed sampling device for coal seams in underground coal mines during sampling;

[0032] Figure 7 This is a state diagram of the sample arrangement parts of a fixed-point closed sampling device for coal seams in underground coal mines when not sampling;

[0033] In the figure: 1. outer cylinder; 2. inner cylinder; 21. sealing block; 22. cooling channel; 3. storage chamber; 4. drill bit; 41. outer drill; 411. exhaust duct; 42. inner drill; 421. sample inlet; 422. sampling part; 423. sealing part; 424. V-shaped double channel; 5. sample arrangement part; 51. concave cylinder seat; 52. sample arrangement tube; 53. material channel; 54. air duct; 55. inclined channel; 56. valve; 6. joint; 7. sealing part; 71. stable seat; 72. sliding seat; 721. sensor chip; 73. spring; 74. through port; 8. fixed seat; 9. connecting port. DETAILED DESCRIPTION

[0034] See also Figure 1-Figure 7 The present invention provides a fixed-point closed sampling device for coal seams in underground coal mines, comprising:

[0035] The outer cylinder 1 has an inner cylinder 2 slidably disposed therein, a storage cavity 3 is formed inside the inner cylinder 2 and a sealing stopper 21 is fixedly connected to one end of the inner wall thereof, and a cooling channel 22 is also provided inside the inner cylinder 2;

[0036] A drill bit 4 is arranged on the outer wall of the outer tube 1;

[0037] The sample arrangement member 5 is fixedly connected to the inner wall of one end of the inner tube 2;

[0038] A joint 6, one end of which is connected to the outer tube 1, and the other end of which is connected to an external drill pipe; and

[0039] The sealing member 7 is arranged on the outer wall of the sample discharging member 5 .

[0040] In this embodiment, the drill bit 4 is mainly used for drilling and coal sampling operations, the sample discharger 5 is mainly used to discharge the coal sample in the storage chamber 3, and it can control the temperature of the coal sample to remain basically constant, and the sealing member 7 can realize the switching of the device between the normally closed state and the open state.

[0041] Furthermore, the drill bit component 4 includes: an outer drill 41, which is fixedly connected to the outer wall of the outer tube 1 through a connecting seat, and an exhaust duct 411 is opened on the outer drill 41, and the exhaust duct 411 can be connected to the cooling channel 22, and the outer drill 41 is detachably threaded with an inner drill 42.

[0042] Further, the inner drill 42 comprises:

[0043] The injection port 421 is arranged inside the inner drill 42;

[0044] The sampling portion 422 is integrally fixedly connected to one end of the inner drill 42, and a V-shaped double channel 424 is provided in the sampling portion 422, one end of the V-shaped double channel 424 is connected to the injection port 421, and the other end passes through the side wall of the sampling portion 422 and is connected to the storage cavity 3, and the outer wall of the sampling portion 422 is slidably connected to the sealing block 21; and

[0045] The sealing portion 423 is disposed at an end of the sampling portion 422 away from the inner drill 42 .

[0046] As a preferred embodiment, the outer drill 41 performs drilling operation, and the inner drill 42 performs sampling operation. During the sampling process: the coal sample to be taken will enter the V-shaped double channel 424 through the sampling port 421. At this time, the inner cylinder 2 drives the sealing block 21 to slide (such as Figure 4 The gray arrow points to Figure 4 At this time, the V-shaped double channel 424 and the storage chamber 3 form a through cavity, and the device is in an open state (i.e., sampling), and the coal sample can enter the storage chamber 3 through the V-shaped double channel 424 (e.g., Figure 4 In the process of drilling and retracting: the inner tube 2 will drive the sealing block 21 to slide (as shown by the black arrow in the middle); Figure 5 The gray arrow points to Figure 5 Position, at this time, the sealing block 21 is in contact with the sealing part 423, and the V-shaped double channel 424 forms a sealed cavity. The device is in a normally closed state (i.e. drilling and retracting), which can prevent the entry of impurities and cause blockage during the drilling process, and can ensure the stability of the coal sample taken during the retracting process, and prevent the coal sample from being in contact with the outside world for a long time, which may cause changes in its own characteristics and reduce the detection accuracy.

[0047] It should be noted that the transition of the device between the open state and the normally closed state is mainly controlled by the sliding of the sealing block 21. The specific sliding embodiment of the sealing block 21 will be introduced below.

[0048] Further, the sample arrangement part 5 comprises:

[0049] A concave cylinder seat 51, the outer wall of which is fixedly connected to the inner wall of one end of the inner cylinder 2; and

[0050] The sample discharge tube 52 is disposed inside the concave cylinder seat 51 and penetrates the concave cylinder seat 51 . One end of the sample discharge tube 52 is connected to the storage cavity 3 , and the other end is connected to a fixing seat 8 . A connecting port 9 is disposed on the fixing seat 8 .

[0051] Furthermore, the sample discharge tube 52 is a double-tube design of an inner tube and an outer tube, an air duct 54 is formed between the inner tube and the outer tube, a material channel 53 is formed inside the inner tube, a valve 56 is provided on the outer wall of the outer tube, the valve 56 connects the air duct 54 with a ramp 55 connected to the outer wall of the outer tube, the end of the ramp 55 away from the valve 56 is connected to the cooling channel 22, the air duct 54 and one end of the material channel 53 are both connected to the storage chamber 3, the other end of the air duct 54 is connected to the external air supply part through the connecting port 9, and the other end of the material channel 53 is connected to the discharge port.

[0052] Further, the sealing member 7 comprises:

[0053] A stabilizing seat 71, the outer wall of which is fixedly connected to the inner wall of the connector 6, and the inner wall of which is slidably connected to the outer wall of the sample discharge tube 52; and

[0054] The sliding seat 72 has an outer wall that is slidably connected to the inner wall of the outer cylinder 1, and an inner wall that is fixedly connected to the outer wall of the sample row tube 52. A through hole 74 is provided on the stable seat 71, and a spring 73 that is sleeved on the outer wall of the sample row tube 52 is connected between the stable seat 71 and the sliding seat 72. An induction chip 721 is provided at one end of the sliding seat 72 that is close to the concave cylinder seat 51.

[0055] Furthermore, the through port 74 is connected to an external water supply portion, and a water cavity is formed between the stable seat 71 and the sliding seat 72 .

[0056] Furthermore, the sensor chip 721 can control the opening and closing of the valve 56 .

[0057] As a preferred embodiment, the sensing chip 721 is a pressure testing chip. When the measured pressure is higher than a specific value, the valve 56 will be controlled to open, otherwise the valve 56 will be controlled to close. It should be noted that the specific value is the numerical value of the water pressure formed by the external water supply and the side of the sliding seat 72 when the external water supply pushes the sliding seat 72, the sample arrangement 5, the inner cylinder 2 and the sealing block 21 to slide to the moment when the device is in an open state (i.e. sampling).

[0058] When the device is sampling, the external water supply unit starts to provide external water supply, and the external water supply flows through the port 74 and enters the water cavity. As the water supply continues to flow, the sliding seat 72 will stretch the spring 73 and drive the sliding seat 72 to move rightward in the horizontal direction (for the specific definition of the directional words such as "horizontal" and "rightward", please refer to Figure 1 ), the sliding seat 72 will synchronously drive the sample tube 52, the inner tube 2 and the sealing block 21 to slide until the sealing block 21 slides to the position as shown in FIG. Figure 4 At the position shown, the cooling channel 22 and the exhaust channel 411 are connected, the device enters the open state, and the sampling operation can be started. It should be noted that when sampling, the pressure value measured by the sensor chip 721 is higher than the specific value, that is, the valve 56 is in the open state. At this time, the external air supply unit provides external cold air, and the external cold air enters the air channel 54 through the connecting port 9 and then flows through the inclined channel 55 and enters the cooling channel 22 (as shown in FIG. Figure 6 The black arrow in the figure indicates that the coal samples are finally discharged through the exhaust duct 411. During this process, all the coal samples will flow through the storage chamber 3 and enter the material channel 53 (as shown in FIG. Figure 6 The gray arrow in the middle points to the direction shown), and the external cold air will continue to flow in the cooling channel 22, which can control the temperature in the storage chamber 3 to reach a constant state, avoiding the increase in the temperature of the coal sample due to long-term friction during the slow sampling process, thereby affecting the overall quality of the coal sample and causing inconvenience for subsequent detection.

[0059] When the device is retracting the drill, the external water supply is stopped, and the spring 73 uses its own elastic force to drive the sliding seat 72, the sample tube 52, the inner tube 2 and the sealing block 21 to slide to the left in the horizontal direction (for the specific definition of the directional words such as "horizontal" and "left", please refer to Figure 1 ), until the sealing stopper 21 slides to Figure 5At the position shown, the cooling channel 22 and the exhaust channel 411 are no longer connected and the cooling channel 22 is closed, the device enters the normally closed state, and the pressure value measured by the sensor chip 721 is lower than the specific value, that is, the valve 56 is in the closed state. At this time, the external cold air will enter the storage chamber 3 through the air duct 54 (as shown in FIG. Figure 7 It should be noted that when the device is drilling, since there is no external water supply, the spring 73 itself is in an unstretched initial state and the device is also in a normally closed state.

[0060] In specific implementation, the drilling operation is started after the position is fixed in advance. At this time, the device is in a normally closed state. After reaching the specified position, the sampling operation is started. At this time, the device is in an open state. The coal sample enters the storage chamber 3 through the drill bit 4 and then enters the material channel 53 for subsequent detection. During the sampling process, the external cold air continuously fed into the cooling channel 22 will keep the temperature of the coal sample constant. After the sampling is completed, the drilling operation is performed. At this time, the device returns to the normally closed state, and the external cold air will flow through the air duct 54 into the storage chamber 3 for cleaning.

[0061] What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fixed-point closed sampling device for coal seams in underground coal mines, characterized in that: include: An outer cylinder (1) is provided with an inner cylinder (2) slidably disposed therein, a storage chamber (3) is formed inside the inner cylinder (2) and a sealing stopper (21) is fixedly connected to one end of the inner wall of the inner cylinder (2), and a cooling channel (22) is also provided inside the inner cylinder (2); A drill bit (4) is arranged on the outer wall of the outer cylinder (1); A sample arrangement member (5) is fixedly connected to the inner wall of one end of the inner tube (2); A joint (6), one end of which is connected to the outer cylinder (1) and the other end of which is connected to an external drill rod; and A sealing member (7) is arranged on the outer wall of the sample discharging member (5).

2. A fixed-point closed sampling device for coal seams in underground coal mines according to claim 1, characterized in that: The drill head component (4) comprises an outer drill (41) fixedly connected to the outer wall of the outer tube (1) via a connecting seat, an exhaust duct (411) is provided on the outer drill (41), and the exhaust duct (411) can be connected to the cooling channel (22), and an inner drill (42) is detachably threadedly connected to the outer drill (41).

3. A fixed-point closed sampling device for coal seams in underground coal mines according to claim 2, characterized in that: The inner drill (42) comprises: A sample inlet (421) is disposed inside the inner drill (42); a sampling portion (422) integrally fixedly connected to one end of the inner drill (42), a V-shaped double channel (424) being provided in the sampling portion (422), one end of the V-shaped double channel (424) being connected to the sampling port (421), and the other end of the V-shaped double channel (424) penetrating the side wall of the sampling portion (422) and being connected to the storage cavity (3), and an outer wall of the sampling portion (422) being slidably connected to the sealing block (21); and The sealing portion (423) is arranged at an end of the sampling portion (422) away from the inner drill (42).

4. The device for sampling coal seams at fixed points in underground coal mines according to claim 1, characterized in that: The sample arrangement part (5) comprises: A concave cylinder seat (51), the outer wall of which is fixedly connected to the inner wall of one end of the inner cylinder (2); and A sample row tube (52) is arranged inside the concave cylinder seat (51) and penetrates the concave cylinder seat (51); one end of the sample row tube (52) is connected to the storage cavity (3); the other end is connected to a fixing seat (8); and a connecting port (9) is provided on the fixing seat (8).

5. A fixed-point closed sampling device for coal seams in underground coal mines according to claim 4, characterized in that: The sample discharge pipe (52) is a double-tube design of an inner tube and an outer tube, an air duct (54) is formed between the inner tube and the outer tube, a material channel (53) is formed inside the inner tube, a valve (56) is provided on the outer wall of the outer tube, the valve (56) connects the air duct (54) with a ramp (55) connected to the outer wall of the outer tube, the end of the ramp (55) away from the valve (56) is connected to the cooling channel (22), one end of the air duct (54) and the material channel (53) are both connected to the storage chamber (3), the other end of the air duct (54) is connected to the external air supply part through the connecting port (9), and the other end of the material channel (53) is connected to the discharge port.

6. A fixed-point closed sampling device for coal seams in underground coal mines according to claim 5, characterized in that: The sealing member (7) comprises: A stabilizing seat (71), the outer wall of which is fixedly connected to the inner wall of the joint (6), and the inner wall of which is slidably connected to the outer wall of the sample discharge tube (52); and The sliding seat (72) has an outer wall slidably connected to the inner wall of the outer cylinder (1), and an inner wall fixedly connected to the outer wall of the sample row tube (52). The stable seat (71) is provided with a through hole (74), and a spring (73) sleeved on the outer wall of the sample row tube (52) is connected between the stable seat (71) and the sliding seat (72). An induction chip (721) is provided at one end of the sliding seat (72) close to the concave cylinder seat (51).

7. A fixed-point closed sampling device for coal seams in underground coal mines according to claim 6, characterized in that: The through port (74) is in communication with an external water supply portion, and a water cavity is formed between the stable seat (71) and the sliding seat (72).

8. The device for sampling coal seams at fixed points in underground coal mines according to claim 6, characterized in that: The sensing chip (721) can control the opening and closing of the valve (56).

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