Multi-coal-seam pre-pumping metering device

Abstract

The utility model discloses a multi-coal seam pre-extraction metering device which comprises a gas main pipe arranged in a transportation roadway, an independent branch pipe is arranged in each evaluation unit of the gas main pipe, an independent extraction automatic metering device is arranged on each branch, the extraction automatic metering devices are arranged on straight pipe sections, and straight pipes are arranged in front of and behind the devices by 5m and are consistent in pipe diameter. After fixed-point hole sealing, separate-source metering is carried out on multiple coal seams at the same time, independent metering in an evaluation unit is achieved, various gas data in an evaluation range can be more accurately and clearly determined, accurate metering and accurate pre-pumping are achieved, coal uncovering time is shortened, and coal uncovering speed is greatly increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas control, and in particular relates to a multi-coal seam pre-extraction metering device. Background Art

[0002] In the construction of a close-range coal seam group, the coal seams with special return air stone gates are close to each other, the coal-excavation process is complex, the difficulty coefficient is high, and the coal-excavation period is long. To solve this problem, the staff proposed a technology for rapid coal-excavation in advance and synchronous pre-extraction for a close-range coal seam group. This technology uses the adjacent tunnel to construct a borehole along the coal seam in advance to pre-extract the coal seam to be exposed, and constructs a through-layer borehole 7m in front of the working face in the normal direction to supplement the extraction blind area, and immediately seals the borehole along the layer after drilling to achieve remote gas control. If the metering device is installed for each layer of coal uncovered in the previous process, there is a problem of inaccurate extraction volume and pre-extraction rate in the statistical evaluation unit of the metering device, which affects the efficiency of coal-excavation. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a multi-coal seam pre-extraction metering device, which performs source-by-source metering on multiple coal seams simultaneously to realize independent metering within an evaluation unit.

[0004] The utility model adopts a technical solution of a multi-coal seam pre-extraction metering device, comprising a gas main pipe installed in a transport lane, wherein the gas main pipe is divided into an independent branch pipe in each evaluation unit, and an independent extraction automatic metering device is installed on the branch pipe.

[0005] Preferably, the above-mentioned automatic extraction metering device is installed in a straight pipe section, and the 5m before and after the device are straight pipes with the same diameter.

[0006] Preferably, an arc-shaped protective cover is provided above the above-mentioned automatic extraction metering device, and the bottoms of both sides of the arc-shaped protective cover are connected to two clamps through elastic telescopic rods. The two clamps are fixedly connected to the branch pipe and are located at both ends of the automatic extraction metering device.

[0007] Preferably, the length of the arc-shaped protective cover is greater than the length of the gas metering device, and the gas metering device is installed on the branch pipe through two flanges.

[0008] Preferably, the outer lower side of the flange supports two arc blocks, the arc groove on the upper part of the arc block is consistent with the shape of the branch pipe, and an elastic rubber layer is arranged in the arc groove, the two arc blocks are fixedly connected to the shock-absorbing beam, a shock-absorbing groove is arranged in the shock-absorbing beam, shock-absorbing steel balls are placed in the shock-absorbing groove, and the shock-absorbing beam is fixedly connected to the ground through two supporting legs.

[0009] Preferably, a group of steam-water separation and drainage devices are installed in the low-lying areas drilled in each evaluation unit, including a high-negative pressure extraction pipe, one end of which is connected to the branch pipe, and the other end is connected to the air outlet of the steam-water diversion device, and the air inlet of the steam-water diversion device is sealed and connected to the borehole through a bellows.

[0010] Preferably, the steam-water diversion device comprises a water storage barrel, a drain valve is arranged at the bottom of the water storage barrel, a pressure relief hole is installed at the top of the water storage barrel, a high negative pressure extraction pipe is installed with valve one, and a valve two is installed at the air inlet.

[0011] Preferably, the high negative pressure extraction pipe is connected in parallel with an extraction pipe, one end of the extraction pipe is connected to the top of the high negative pressure extraction pipe and to the branch pipe, and the other end is connected to the bellows, and a valve three is installed on the extraction pipe.

[0012] Compared with the prior art, the beneficial effect of the utility model is that after the fixed-point sealing, multiple coal seams can be metered by source at the same time to achieve independent metering within the evaluation unit, which can more accurately and clearly show the gas data within the evaluation range. The automatic metering device is calibrated every 5 to 10 days, and a calibration record of the automatic metering device for extraction is established to ensure that the error of the automatic metering device does not exceed 5%, thereby achieving accurate metering and precise pre-extraction, shortening the coal uncovering time, and greatly improving the speed of coal uncovering. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the layout of multi-coal seam pre-extraction metering devices;

[0014] Figure 2 This is a schematic diagram of the installation of the automatic metering device for extraction;

[0015] Figure 3 This is a schematic diagram of the structure of the steam-water separation and water discharge device. DETAILED DESCRIPTION

[0016] The present invention will be further explained below in conjunction with the accompanying drawings to facilitate better understanding by those skilled in the art.

[0017] Example 1

[0018] like Figure 1-3As shown, the multi-coal seam pre-extraction metering device includes a gas main pipe 1 installed in the transport lane, the gas main pipe 1 is installed in the transport stone gate, the pipe diameter is 350mm, the gas main pipe 1 is divided into an independent branch pipe 2 in each evaluation unit, the branch pipe 2 has a diameter of 200mm, and an independent extraction automatic metering device 3 is installed on the branch pipe 2; the extraction automatic metering device 3 is installed in the straight pipe section, and the 5m before and after the device is a straight pipe with the same pipe diameter. The extraction automatic metering device 3 is adjusted every 5 to 10 days, and the extraction automatic metering device adjustment account is established to ensure that the extraction automatic metering 3 error does not exceed 5%, thereby realizing the synchronous pre-extraction and source metering of multiple coal seams, which greatly improves the speed of coal uncovering.

[0019] In order to prevent the automatic extraction metering device 3 from being damaged by collision with foreign objects, an arc-shaped protective cover 4 is provided above the automatic extraction metering device 3. The length of the arc-shaped protective cover 4 is greater than the length of the automatic extraction metering device 3. The bottoms of both sides of the arc-shaped protective cover 4 are connected to two clamps 6 through elastic telescopic rods 5. The elastic telescopic rods 5 are used to buffer and protect the arc-shaped protective cover 4 when it is impacted by a large force. The two clamps 6 are fixedly connected to the branch pipe 2 and are located at both ends of the automatic extraction metering device 3. The automatic extraction metering device 3 is installed on the branch pipe 2 through two flanges.

[0020] Furthermore, the lower side of the flange supports two arc blocks 7, the arc groove on the upper part of the arc block 7 is consistent with the shape of the branch pipe 2, and an elastic rubber layer is provided in the arc groove. The two arc blocks 7 are fixedly connected to the shock-absorbing cross beam 8, and a shock-absorbing groove is provided in the shock-absorbing cross beam 8. Shock-absorbing steel balls are placed in the shock-absorbing groove. The shock-absorbing cross beam 8 is fixedly connected to the ground through two supporting legs 9. This structure is conducive to the branch pipe 2 falling into the arc groove. The arc block 7 supports the branch pipe 2 and has a shock-absorbing effect, so as to prevent the branch pipe 2 from being affected by vibration and affecting the measurement accuracy of the automatic metering device 3.

[0021] Furthermore, a set of steam-water separation and drainage devices are installed in the low-lying areas of each evaluation unit, including a high-negative pressure extraction pipe 10, one end of which is connected to the branch pipe 2, and the other end is connected to the air outlet of the steam-water diversion device 11, and the air inlet of the steam-water diversion device 11 is sealed and connected to the borehole through a bellows 12. The water in the borehole is pumped to the steam-water separation and drainage device by high negative pressure to avoid water accumulation affecting the extraction effect and reduce safety hazards.

[0022] Preferably, the steam-water diversion device 11 comprises a water storage barrel 1101, a drain valve 13 is arranged at the bottom of the water storage barrel 1101, a valve 15 is installed at the high negative pressure extraction pipe 10, and a valve 2 16 is installed at the air inlet; by closing valve 15 and valve 2 16 and opening the drain valve 13, the stored water can be discharged; in order to play a safety role, a pressure relief hole 14 is installed at the top of the water storage barrel 1101.

[0023] In order to realize the extraction transition during the water discharge process, the high negative pressure extraction pipe 10 is connected in parallel with the extraction pipe 17. One end of the extraction pipe 17 is connected to the top of the high negative pressure extraction pipe 10 and is connected to the gas extraction branch pipe 2, and the other end is connected to the bellows 10. The extraction pipe 17 is equipped with a valve 3 18. When the valve 3 18 is opened, the valve 1 15 and the valve 2 16 are closed, so that the water storage bucket can be discharged while the extraction is realized. The valves 1, 2 and 3 are ball valves.

[0024] The above-mentioned embodiments are only for describing the preferred implementation of the utility model, and are not intended to limit the scope of the utility model. Without departing from the design spirit and principle of the utility model, various modifications and improvements made by those skilled in the art to the technical solution of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. Multi-coal seam pre-extraction metering device, characterized in that: It includes a gas main pipe installed in the transport lane. The gas main pipe is divided into an independent branch pipe in each evaluation unit, and an independent extraction automatic metering device is installed on the branch.

2. The multi-coal seam pre-extraction metering device according to claim 1 is characterized in that: The automatic extraction metering device is installed in the straight pipe section, and the 5m before and after the device is a straight pipe with the same pipe diameter.

3. The multi-coal seam pre-extraction metering device according to any one of claims 1 or 2, characterized in that: An arc-shaped protective cover is arranged above the automatic extraction metering device. The bottoms of both sides of the arc-shaped protective cover are connected to two clamps through elastic telescopic rods. The two clamps are fixedly connected to the branch pipe and are located at both ends of the automatic extraction metering device.

4. The multi-coal seam pre-extraction metering device according to claim 3 is characterized in that: The length of the arc-shaped protective cover is greater than the length of the gas metering device, and the gas metering device is installed on the branch pipe through two flanges.

5. The multi-coal seam pre-extraction metering device according to claim 4 is characterized in that: The outer lower side of the flange supports two arc blocks, the arc groove on the upper part of the arc block is consistent with the shape of the branch pipe, and an elastic rubber layer is arranged in the arc groove, the two arc blocks are fixedly connected to the shock-absorbing beam, a shock-absorbing groove is arranged in the shock-absorbing beam, and shock-absorbing steel balls are placed in the shock-absorbing groove, and the shock-absorbing beam is fixedly connected to the ground through two supporting legs.

6. The multi-coal seam pre-extraction metering device according to claim 1 is characterized in that: A set of steam-water separation and drainage devices are installed in the low-lying areas of drilling in each evaluation unit, including a high-vacuum extraction pipe. One end of the high-vacuum extraction pipe is connected to the branch pipe, and the other end is connected to the air outlet of the steam-water diversion device. The air inlet of the steam-water diversion device is sealed and connected to the borehole through a bellows.

7. The multi-coal seam pre-extraction metering device according to claim 6, characterized in that: The steam-water diversion device comprises a water storage barrel, a drain valve is arranged at the bottom of the water storage barrel, a pressure relief hole is installed at the top of the water storage barrel, a high negative pressure extraction pipe is installed with valve one, and an air inlet is installed with valve two.

8. The multi-coal seam pre-extraction metering device according to claim 6, characterized in that: The high negative pressure extraction pipe is connected in parallel with an extraction pipe, one end of the extraction pipe is connected to the top of the high negative pressure extraction pipe and the branch pipe, and the other end is connected to the bellows, and valve three is installed on the extraction pipe.

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