Negative-pressure automatic drainage device for underground coal mine extraction pipeline

Abstract

The invention relates to the field of underground coal mine extraction, in particular to a negative-pressure automatic drainage device for an underground coal mine extraction pipeline. According to the negative-pressure automatic drainage device for the underground coal mine extraction pipeline, when the liquid level sensor is damaged, the drainage plate can still be opened for drainage, and the influence on the gas extraction efficiency and safety is avoided. An automatic negative-pressure drainage device for an underground extraction pipeline of a coal mine comprises a mounting frame, a collecting pipe and the like, and the collecting pipe is connected to the upper side of the right portion of the mounting frame. When accumulated water exists in the collecting pipe, negative pressure in the collecting pipe is reduced, a first pressure spring rebounds, a pressing plate moves outwards to be separated from a switch, the switch triggers an electric push rod on a first connecting piece to be started, a second connecting piece is driven to move, and a drainage plate is rotated to be opened; and the drainage plate can still be opened to drain water, so that the influence on the gas extraction efficiency and the safety is avoided.

Description

Technical Field

[0001] The invention relates to the field of underground coal mine extraction, and in particular to a negative pressure automatic water discharge device for an underground coal mine extraction pipeline. Background Art

[0002] The negative pressure automatic water discharge device for underground coal mine gas extraction pipeline is a device used to solve the problem of water accumulation in the underground coal mine gas extraction system. This device can automatically detect and discharge the accumulated water in the pipeline to ensure the normal operation and safety of the extraction system.

[0003] The existing negative pressure automatic water discharge device for underground coal mine extraction pipelines detects the water accumulation in the pipeline through a liquid level sensor. When the accumulated water reaches a preset liquid level, the liquid level sensor will send a signal to the control system, and the control system will start the solenoid valve to open the water discharge port to discharge the water. However, since the liquid level sensor may be damaged during use, it is impossible to detect the water accumulation in the pipeline in time, and then the water discharge port cannot be opened in time to discharge the water, which affects the gas extraction efficiency and safety.

[0004] Therefore, an automatic negative pressure water discharge device for underground coal mine extraction pipelines has been developed, which can still open the drain plate to drain water when the liquid level sensor is damaged, so as to avoid affecting the gas extraction efficiency and safety. Summary of the invention

[0005] In order to overcome the shortcomings of the existing automatic negative pressure water discharge device for underground coal mine extraction pipelines, in which the liquid level sensor may be damaged during use, resulting in the inability to timely detect the water accumulation in the pipeline, and then the water discharge port cannot be opened in time to discharge water, resulting in affecting the gas extraction efficiency and safety. The present invention provides an automatic negative pressure water discharge device for underground coal mine extraction pipelines, which can still open the drain plate to drain water when the liquid level sensor is damaged, thereby avoiding affecting the gas extraction efficiency and safety.

[0006] The technical solution of the present invention is: a negative pressure automatic water discharge device for underground extraction pipelines in a coal mine, comprising a mounting frame, a collecting pipe, a drain plate, a liquid level detection barrel, a liquid level sensor, a water inlet pipe, a connecting pipe and a control mechanism, wherein the upper right side of the mounting frame is connected to the collecting pipe, the lower middle side of the collecting pipe is rotatably connected to the drain plate, the upper left side of the mounting frame is connected to the liquid level detection barrel, the upper side of the liquid level detection barrel is connected to the liquid level sensor, the liquid level detection barrel is connected to the collecting pipe, the upper sides of the left and right parts of the collecting pipe are both connected to the water inlet pipe, a connecting pipe is placed on the upper side of the water inlet pipe on the left, and the collecting pipe is provided with a control mechanism capable of controlling the opening of the drain plate.

[0007] Furthermore, the control mechanism includes a pressure plate, a first pressure spring, a switch, a first connecting piece, an electric push rod and a second connecting piece. A pressure plate is slidably connected to the middle of the collecting pipe, a first pressure spring is connected between the pressure plate and the collecting pipe, a switch is connected to the front side of the middle of the collecting pipe, the pressure plate is in contact with the switch, and the first pressure spring is in a compressed state at this time. A first connecting piece is connected to the front side of the middle of the collecting pipe, the first connecting piece is located on the left side of the switch, an electric push rod is rotatably connected to the first connecting piece, a second connecting piece is rotatably connected to the telescopic end of the electric push rod, the second connecting piece is connected to the drain board, the switch and the electric push rod are connected by wires, when water accumulates in the collecting pipe, the negative pressure in the collecting pipe decreases, causing the first pressure spring to rebound, and the pressure plate moves outward to disengage from the switch, so that the switch triggers the electric push rod on the first connecting piece to start, driving the second connecting piece to move, and causing the drain board to rotate and open.

[0008] Furthermore, it also includes a sealing mechanism, which includes a fixed frame, a cylinder, a support frame and a sealing block. The front and rear sides of the water inlet pipe are connected to the fixed frames, the fixed frames are connected to the cylinders, the telescopic ends of the cylinders are connected to the support frames, and sealing blocks are placed between the upper sides of two adjacent support frames. The sealing block on the left is located between the water inlet pipe and the connecting pipe. The sealing block is placed at the joint between the water inlet pipe and the connecting pipe, and then the cylinder on the fixed frame is started to push the support frame to move upward to support the sealing block.

[0009] Furthermore, it also includes a locking mechanism, which includes a guide block, a limit block, a second pressure spring, a guide frame and a connecting block. The support frame is slidably connected to the guide block, and the upper part of the guide block is slidably connected to the limit block. The left and right parts of the limit block are connected to the connected guide block with a second pressure spring. The support frame is connected to the guide frame, and the guide frame is located at the lower side of the guide block. The left and right sides of the limit block are connected to the connecting blocks, and the connecting blocks are movably connected to the adjacent guide frames. When the support frame moves upward, it drives the guide block to move upward, so that the limit block contacts the sealing block, and then the sealing block squeezes the limit block to move outward, and the second pressure spring is squeezed and contracted. When the limit block is separated from the sealing block, the second pressure spring rebounds, so that the limit block moves inward to the upper side of the sealing block. When the connecting pipe needs to be disassembled, the cylinder is started to move the support frame downward, so that the guide frame moves downward. At this time, the connecting block moves outward along the guide frame, driving the limit block to move outward, so that the limit block is no longer located on the upper side of the sealing block, and then the sealing block is removed and the connecting pipe is disassembled.

[0010] Furthermore, the limiting blocks are all wedge-shaped.

[0011] Furthermore, it also includes a clamping mechanism, which includes a support, a rotating frame, a torsion spring, a guide seat and a sliding frame. A plurality of support members are connected to the outer side of the upper part of the water inlet pipe, and the rotating frame is rotatably connected to the support members. A plurality of torsion springs are connected between the rotating frame and the connected support members, and a plurality of guide seats are connected to the outer side of the lower part of the water inlet pipe. The sliding frames are slidably connected between four adjacent guide seats, and the sliding frames pass through adjacent rotating frames. The rotating frames are tightly attached to the connecting pipe by the action of the torsion springs. When the connecting pipe needs to be removed, the sliding frame is pulled downward along the guide seat, so that the sliding frame pulls the rotating frame to rotate outward to disengage from the connecting pipe, and then the connecting pipe is removed.

[0012] Furthermore, it also includes a balancing mechanism, which includes a fixing part, an adjusting rod and a support plate. The front and rear sides of the mounting frame are connected to left and right fixing parts, the fixing parts are threadedly connected to the adjusting rods, and the lower sides of the adjusting rods are rotatably connected to the support plates. When the ground where the mounting frame is placed is uneven, the adjusting rod is rotated to make the support plate contact the ground, and then the position of the fixing part on the adjusting rod is adjusted to adjust the height of the mounting frame.

[0013] Furthermore, a knob is provided on the upper side of the adjusting rod.

[0014] Furthermore, it also includes a collecting mechanism, which includes a collecting frame, a water outlet pipe and a connecting valve. The collecting frame is connected to the middle of the mounting frame, the collecting frame is located below the drain board, the front side of the collecting frame is connected to the water outlet pipe, and a connecting valve is provided on the water outlet pipe. After the drain board is opened, the accumulated water is discharged into the collecting frame. When a lot of water accumulates in the collecting frame, the connecting valve is opened so that the water outlet pipe is opened to discharge the accumulated water.

[0015] Furthermore, a handle is provided on the connecting valve.

[0016] The beneficial effects are: 1. When water accumulates in the collecting pipe, the negative pressure in the collecting pipe is reduced, causing the first pressure spring to rebound and the pressure plate to move outward to disengage from the switch, so that the switch triggers the electric push rod on the first connecting piece to start, driving the second connecting piece to move, and causing the drain plate to rotate and open, thereby achieving the effect of being able to open the drain plate for drainage when the liquid level sensor is damaged, thereby avoiding affecting the gas extraction efficiency and safety.

[0017] 2. The present invention places the sealing block at the joint between the water inlet pipe and the connecting pipe and then starts the cylinder on the fixed frame to push the support frame to move upward to support the sealing block, thereby achieving the effect of sealing the water inlet pipe and the connecting pipe to avoid water leakage.

[0018] 3. The present invention drives the guide block to move upward while the support frame moves upward, so that the limit block contacts the sealing block, and then the sealing block squeezes the limit block to move outward, and the second pressure spring is squeezed and contracts. When the limit block is separated from the sealing block, the second pressure spring rebounds, so that the limit block moves inward to the upper side of the sealing block, thereby achieving the effect of locking the sealing block and preventing the sealing block from moving.

[0019] 4. The present invention uses the force of the torsion spring to make the rotating frame close to the connecting pipe, thereby achieving the effect of being able to clamp the connecting pipe and enhancing the stability of the connecting pipe.

[0020] 5. When the ground where the mounting frame is placed is uneven, the present invention rotates the adjustment rod to make the support plate contact the ground, and then adjusts the position of the fixing part on the adjustment rod, thereby adjusting the height of the mounting frame, thereby achieving the effect of being able to keep the mounting frame balanced so as to adapt to different terrains.

[0021] 6. After the drain plate of the present invention is opened, the accumulated water is discharged into the collection frame. When there is a lot of water accumulated in the collection frame, the connecting valve is opened to open the water outlet pipe to discharge the accumulated water, thereby achieving the effect of being able to collect the accumulated water and avoiding scouring the mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0024] Figure 3 It is a partial three-dimensional structural schematic diagram of the present invention.

[0025] Figure 4 It is a partial three-dimensional structural schematic diagram of the sealing mechanism of the present invention.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the first part of the locking mechanism of the present invention.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the second part of the locking mechanism of the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the first part of the clamping mechanism of the present invention.

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the second part of the clamping mechanism of the present invention.

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the balancing mechanism of the present invention.

[0031] Fig.10It is a partial three-dimensional structural schematic diagram of the present invention.

[0032] Parts names and serial numbers in the figure: 1_mounting frame, 2_collector, 21_drain board, 3_liquid level detection barrel, 31_liquid level sensor, 4_water inlet pipe, 41_connecting pipe, 5_control mechanism, 51_pressing plate, 52_first pressure spring, 53_switch, 54_first connecting piece, 55_electric push rod, 56_second connecting piece, 6_sealing mechanism, 61_fixing frame, 62_cylinder, 63_support frame, 64_sealing block , 7_locking mechanism, 71_guide block, 72_limiting block, 73_second pressure spring, 74_guide frame, 75_connecting block, 8_clamping mechanism, 81_support member, 82_rotating frame, 83_torsion spring, 84_guide seat, 85_sliding frame, 9_balancing mechanism, 91_fixing member, 92_adjusting rod, 93_support plate, 10_collecting mechanism, 101_collecting frame, 102_water outlet pipe, 103_connecting valve. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] A negative pressure automatic water discharge device for underground coal mine extraction pipeline, such as Figure 1 and Figure 2 As shown, it includes a mounting frame 1, a collecting pipe 2, a drain plate 21, a liquid level detection barrel 3, a liquid level sensor 31, a water inlet pipe 4, a connecting pipe 41 and a control mechanism 5. The upper right side of the mounting frame 1 is connected to the collecting pipe 2, the lower middle side of the collecting pipe 2 is rotatably connected to the drain plate 21, the upper left side of the mounting frame 1 is connected to the liquid level detection barrel 3, the upper side of the liquid level detection barrel 3 is connected to the liquid level sensor 31, the liquid level detection barrel 3 is connected to the collecting pipe 2, the upper left and right sides of the collecting pipe 2 are both connected to the water inlet pipe 4, the upper side of the water inlet pipe 4 on the left is placed with a connecting pipe 41, and the collecting pipe 2 is provided with a control mechanism 5.

[0035] like Figure 1 and Figure 3 As shown, the control mechanism 5 includes a pressure plate 51, a first pressure spring 52, a switch 53, a first connecting piece 54, an electric push rod 55 and a second connecting piece 56. The pressure plate 51 is slidably connected to the middle of the collecting pipe 2, and the first pressure spring 52 is connected between the pressure plate 51 and the collecting pipe 2. The switch 53 is connected to the front side of the middle of the collecting pipe 2. The pressure plate 51 is in contact with the switch 53. At this time, the first pressure spring 52 is in a compressed state. The first connecting piece 54 is connected to the front side of the middle of the collecting pipe 2. The first connecting piece 54 is located on the left side of the switch 53. The electric push rod 55 is rotatably connected to the first connecting piece 54. The second connecting piece 56 is rotatably connected to the telescopic end of the electric push rod 55. The second connecting piece 56 is connected to the drain plate 21. The switch 53 and the electric push rod 55 are connected by wires.

[0036] When using the present invention, first place the mounting frame 1 in the underground extraction area of ​​the coal mine, and then connect the water outlet of the gas pipeline with the water inlet pipe 4 through the connecting pipe 41. When the gas pipeline is drained, the accumulated water enters the collecting pipe 2 through the water inlet pipe 4, and then flows into the liquid level detection barrel 3. The accumulated water is detected by the liquid level sensor 31. When the accumulated water reaches a preset liquid level, the control system controls the drain plate 21 to rotate and open, so that the accumulated water is discharged from the collecting pipe 2. When the liquid level sensor 31 is damaged, water accumulates in the collecting pipe 2. When there is accumulated water in the collecting pipe 2, the negative pressure in the collecting pipe 2 is reduced, so that the first pressure spring 52 rebounds, and the pressure plate 51 moves outward to disengage from the switch 53, so that the switch 53 triggers the electric push rod 55 on the first connecting member 54 to start, driving the second connecting member 56 to move, so that the drain plate 21 rotates and opens, thereby achieving the effect of being able to open the drain plate 21 for drainage when the liquid level sensor 31 is damaged, thereby avoiding affecting the gas extraction efficiency and safety.

[0037] like Figure 1 and Figure 4 As shown, a sealing mechanism 6 is also included, and the sealing mechanism 6 includes a fixing frame 61, a cylinder 62, a support frame 63 and a sealing block 64. The front and rear sides of the water inlet pipe 4 are connected to the fixing frame 61, the cylinder 62 is connected to the fixing frame 61, and the telescopic end of the cylinder 62 is connected to the support frame 63. A sealing block 64 is placed between the upper sides of two adjacent support frames 63, and the sealing block 64 on the left is located between the water inlet pipe 4 and the connecting pipe 41.

[0038] By using the sealing mechanism 6 of the present device, the water inlet pipe 4 and the connecting pipe 41 can be sealed. The sealing block 64 is placed at the joint between the water inlet pipe 4 and the connecting pipe 41, and then the cylinder 62 on the fixed frame 61 is started to push the support frame 63 to move upward to support the sealing block 64, thereby sealing the water inlet pipe 4 and the connecting pipe 41 to prevent water leakage.

[0039] like Figure 1 , Figure 5 and Figure 6 As shown, a locking mechanism 7 is also included, which includes a guide block 71, a limit block 72, a second pressure spring 73, a guide frame 74 and a connecting block 75. The support frame 63 is slidably connected to the guide block 71, and the upper part of the guide block 71 is slidably connected to the limit block 72. The limit blocks 72 are wedge-shaped to facilitate limiting the sealing block 64. The left and right parts of the limit blocks 72 are connected to the connected guide blocks 71 with a second pressure spring 73. The support frame 63 is connected to the guide frame 74, and the guide frame 74 is located on the lower side of the guide block 71. The left and right sides of the limit blocks 72 are connected to the connecting blocks 75, and the connecting blocks 75 are movably connected to the adjacent guide frames 74.

[0040] When the locking cam 72 is disengaged from the sealing block 64, the second pressure spring 73 rebounds, causing the limiting block 72 to move inwardly to the upper side of the sealing block 64, thereby locking the sealing block 64 and preventing the sealing block 64 from moving. When the connecting pipe 41 needs to be removed, the cylinder 62 is started to move the supporting frame 63 downward, causing the guide frame 74 to move downward. At this time, the connecting block 75 moves outward along the guide frame 74, driving the limiting block 72 to move outward, so that the limiting block 72 is no longer located on the upper side of the sealing block 64, and then the sealing block 64 is removed and the connecting pipe 41 is removed.

[0041] like Figure 1 , Figure 7 and Figure 8 As shown, a clamping mechanism 8 is also included, and the clamping mechanism 8 includes a support member 81, a rotating frame 82, a torsion spring 83, a guide seat 84 and a sliding frame 85. Four support members 81 are connected to the outer side of the upper part of the water inlet pipe 4, and the rotating frame 82 is rotatably connected to the support member 81. Two torsion springs 83 are connected between the rotating frame 82 and the connected support member 81. Four guide seats 84 are connected to the outer side of the lower part of the water inlet pipe 4, and sliding frames 85 are slidably connected between the four adjacent guide seats 84, and the sliding frames 85 pass through the adjacent rotating frames 82.

[0042] The clamping mechanism 8 of the device can be used to clamp the connecting tube 41. The force of the torsion spring 83 makes the rotating frame 82 close to the connecting tube 41, thereby clamping the connecting tube 41 and enhancing the stability of the connecting tube 41. When the connecting tube 41 needs to be removed, the sliding frame 85 is pulled downward along the guide seat 84, so that the sliding frame 85 pulls the rotating frame 82 to rotate outward to disengage from the connecting tube 41, and then the connecting tube 41 is removed.

[0043] like Figure 1 and Fig. 9 As shown, a balancing mechanism 9 is also included, and the balancing mechanism 9 includes a fixing member 91, an adjusting rod 92 and a support plate 93. The mounting frame 1 is connected to left and right fixing members 91 on both the front and rear sides, and the fixing members 91 are threadedly connected to the adjusting rods 92. The upper side of the adjusting rods 92 is provided with a knob for easy rotation, and the lower side of the adjusting rods 92 is rotatably connected to the support plate 93.

[0044] By using the balancing mechanism 9 of the device, the balance of the mounting frame 1 can be maintained. When the ground where the mounting frame 1 is placed is uneven, the adjusting rod 92 is rotated to make the supporting plate 93 contact the ground, and then the position of the fixing member 91 on the adjusting rod 92 is adjusted, thereby adjusting the height of the mounting frame 1, thereby maintaining the balance of the mounting frame 1 so as to adapt to different terrains.

[0045] like Figure 1 and Fig.10 As shown, it also includes a collecting mechanism 10, which includes a collecting frame 101, an outlet pipe 102 and a connecting valve 103. The collecting frame 101 is connected to the middle of the mounting frame 1, and the collecting frame 101 is located below the drain plate 21. The front side of the collecting frame 101 is connected to the outlet pipe 102, and the outlet pipe 102 is provided with a connecting valve 103. The connecting valve 103 is provided with a handle for easy control of opening and closing.

[0046] The collecting mechanism 10 of the device can be used to collect accumulated water. After the drain plate 21 is opened, the accumulated water is discharged into the collecting frame 101. When there is a lot of accumulated water in the collecting frame 101, the connecting valve 103 is opened to open the outlet pipe 102 to discharge the accumulated water, thereby collecting the accumulated water and avoiding scouring the mounting frame 1.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A negative pressure automatic water discharge device for underground coal mine extraction pipeline, characterized in that: The invention comprises a mounting frame (1), a manifold (2), a drain plate (21), a liquid level detection barrel (3), a liquid level sensor (31), a water inlet pipe (4), a connecting pipe (41) and a control mechanism (5). The upper right side of the mounting frame (1) is connected to the manifold (2), the lower middle side of the manifold (2) is rotatably connected to the drain plate (21), the upper left side of the mounting frame (1) is connected to the liquid level detection barrel (3), the upper side of the liquid level detection barrel (3) is connected to the liquid level sensor (31), the liquid level detection barrel (3) is connected to the manifold (2), the upper left and right sides of the manifold (2) are both connected to the water inlet pipe (4), the upper side of the left water inlet pipe (4) is provided with a connecting pipe (41), and the manifold (2) is provided with a control mechanism (5) capable of controlling the opening of the drain plate (21).

2. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 1, characterized in that: The control mechanism (5) comprises a pressure plate (51), a first pressure spring (52), a switch (53), a first connecting piece (54), an electric push rod (55) and a second connecting piece (56). The middle part of the collecting tube (2) is slidably connected with the pressure plate (51), the first pressure spring (52) is connected between the pressure plate (51) and the collecting tube (2), the middle front part of the collecting tube (2) is connected with the switch (53), the pressure plate (51) contacts with the switch (53), at which time the first pressure spring (52) is in a compressed state, the middle front part of the collecting tube (2) is connected with the first connecting piece (54), the first connecting piece (54) is located on the left side of the switch (53), and the first connecting piece (54) is located on the left side of the switch (53). An electric push rod (55) is rotatably connected to a connecting member (54), a second connecting member (56) is rotatably connected to a telescopic end of the electric push rod (55), the second connecting member (56) is connected to the drain plate (21), and the switch (53) is connected to the electric push rod (55) through an electric wire. When water accumulates in the collecting pipe (2), the negative pressure in the collecting pipe (2) decreases, causing the first pressure spring (52) to rebound, and the pressure plate (51) to move outward and disengage from the switch (53), so that the switch (53) triggers the electric push rod (55) on the first connecting member (54) to start, driving the second connecting member (56) to move, so that the drain plate (21) is rotated and opened.

3. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 2, characterized in that: The invention also comprises a sealing mechanism (6), which comprises a fixing frame (61), a cylinder (62), a support frame (63) and a sealing block (64). The front and rear sides of the water inlet pipe (4) are connected to the fixing frame (61), the fixing frame (61) is connected to the cylinder (62), the telescopic end of the cylinder (62) is connected to the support frame (63), and a sealing block (64) is placed between the upper sides of two adjacent support frames (63). The sealing block (64) on the left side is located between the water inlet pipe (4) and the connecting pipe (41). The sealing block (64) is placed at the joint between the water inlet pipe (4) and the connecting pipe (41), and then the cylinder (62) on the fixing frame (61) is started to push the support frame (63) to move upward to support the sealing block (64).

4. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 3, characterized in that: The locking mechanism (7) further comprises a guide block (71), a limit block (72), a second pressure spring (73), a guide frame (74) and a connecting block (75). The support frame (63) is slidably connected with the guide block (71). The upper part of the guide block (71) is slidably connected with the limit block (72). The left and right parts of the limit block (72) are connected to the connected guide block (71) with the second pressure spring (73). The support frame (63) is connected with the guide frame (74). The guide frame (74) is located at the lower side of the guide block (71). The left and right sides of the limit block (72) are connected with the connecting block (75). The connecting block (75) is movably connected to the adjacent guide frame (74). When the support frame (63) moves upward, it drives the guide frame (74) to move upward. The guide frame (74) is moved downwardly by the guide frame (75), and the connecting block (75) moves outwardly along the guide frame (74), and the connecting block (75) moves outwardly by the guide frame (75), so that the limiting block (72) is no longer located on the upper side of the sealing block (64), and the sealing block (64) is removed and the connecting pipe (41) is removed.

5. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 4, characterized in that: The limiting blocks (72) are all wedge-shaped.

6. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 4, characterized in that: The invention also comprises a clamping mechanism (8), the clamping mechanism (8) comprising a support member (81), a rotating frame (82), a torsion spring (83), a guide seat (84) and a sliding frame (85), the outer side of the upper part of the water inlet pipe (4) is connected to a plurality of support members (81), the support members (81) are rotatably connected to the rotating frame (82), the rotating frame (82) and the connected support member (81) are connected to a plurality of torsion springs (83), the outer side of the lower part of the water inlet pipe (4) is connected to a plurality of guide seats (84), and the lower part of the water inlet pipe (4) is connected to a plurality of guide seats (85). 84), four adjacent guide seats (84) are slidably connected with sliding frames (85), and the sliding frames (85) all pass through adjacent rotating frames (82). The rotating frames (82) are closely attached to the connecting pipe (41) by the action of the torsion spring (83). When the connecting pipe (41) needs to be removed, the sliding frame (85) is pulled downward along the guide seat (84), so that the sliding frame (85) pulls the rotating frame (82) to rotate outward and disengage from the connecting pipe (41), and then the connecting pipe (41) is removed.

7. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 6, characterized in that: The invention also comprises a balancing mechanism (9), which comprises a fixing member (91), an adjusting rod (92) and a supporting plate (93). The front and rear sides of the mounting frame (1) are both connected to the left and right fixing members (91), the fixing members (91) are both threadedly connected to the adjusting rods (92), and the lower sides of the adjusting rods (92) are both rotatably connected to the supporting plates (93). When the ground where the mounting frame (1) is placed is uneven, the adjusting rods (92) are rotated to make the supporting plates (93) contact the ground, and then the position of the fixing member (91) on the adjusting rods (92) is adjusted, thereby adjusting the height of the mounting frame (1).

8. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 7, characterized in that: The upper side of the adjusting rod (92) is provided with a knob.

9. The automatic negative pressure water discharge device for underground coal mine extraction pipeline according to claim 7, characterized in that: The utility model also comprises a collecting mechanism (10), wherein the collecting mechanism (10) comprises a collecting frame (101), a water outlet pipe (102) and a connecting valve (103); the collecting frame (101) is connected to the middle of the mounting frame (1); the collecting frame (101) is located below the drainage plate (21); the front side of the collecting frame (101) is connected to the water outlet pipe (102); the water outlet pipe (102) is provided with a connecting valve (103); after the drainage plate (21) is opened, the accumulated water is discharged into the collecting frame (101); when a large amount of water is accumulated in the collecting frame (101), the connecting valve (103) is opened, so that the water outlet pipe (102) is opened to discharge the accumulated water.

10. The negative pressure automatic water discharge device for underground coal mine extraction pipeline according to claim 9, characterized in that: The connecting valve (103) is provided with a handle.

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