Automatic nitrogen concentration and flow regulation and control device for underground nitrogen injection operation

Abstract

The utility model provides an automatic nitrogen concentration and flow regulation and control device for underground nitrogen injection operation, and relates to the technical field of nitrogen injection of a goaf of a fully mechanized coal mining face. The two gate valves are connected end to end, and the gas inlet end of one gate valve is connected with the gas outlet of nitrogen making equipment. While qualified nitrogen flow is maximized, real-time intelligent regulation and control of nitrogen flow and concentration generated in nitrogen injection operation and intelligent management and control of nitrogen generation operation are achieved, during nitrogen injection operation, nitrogen injection operation personnel do not need to observe nitrogen injection concentration and adjust a nitrogen injection regulation and control gate valve all the time, the workload of the nitrogen injection operation personnel is reduced, and the working efficiency is improved. The stability, safety and reliability of nitrogen making operation are improved, unqualified nitrogen is fundamentally prevented from entering the goaf, and the preventive nitrogen injection fireproof effect is practically improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen injection in goaf areas of fully mechanized mining working faces, in particular to a nitrogen concentration and flow automatic control device for underground nitrogen injection operations. Background Art

[0002] According to the requirements of the "Coal Mine Safety Regulations" and "Coal Mine Fire Prevention and Extinguishing Regulations", when nitrogen injection is used as a fire prevention and extinguishing measure in the goaf of a fully-mechanized mining face, the concentration of nitrogen gas injected into the goaf shall not be less than 97%. Since the nitrogen production equipment cannot achieve intelligent regulation of nitrogen production flow and concentration, it is necessary to manually reduce the compressed air flow of the nitrogen production equipment and open the nitrogen production equipment exhaust valve to discharge unqualified nitrogen into the air at the beginning of the nitrogen production operation, until the nitrogen concentration reaches the standard, and then gradually increase the nitrogen flow or close the exhaust valve to enter the normal nitrogen injection process.

[0003] In the actual underground nitrogen injection process, due to the influence of factors such as the aging of the nitrogen production equipment and the performance of the air compressor, the nitrogen injection operators need to always observe the display value of the nitrogen sensor to ensure that the sensor display value is not less than 97%. If the nitrogen concentration is less than 97%, it is necessary to reduce the nitrogen injection flow rate to ensure the nitrogen concentration. In particular, when the nitrogen production equipment is started, the nitrogen concentration output by the nitrogen production equipment is basically close to the nitrogen concentration in the air. The operation of controlling the concentration of nitrogen output by the nitrogen production equipment by manually adjusting the nitrogen production flow rate is relatively frequent and complicated, and it is difficult to ensure that the nitrogen concentration injected into the goaf is fully in compliance with regulations. Utility Model Content

[0004] The utility model aims to solve the problems raised in the background technology and provides a nitrogen concentration and flow automatic control device for underground nitrogen injection operation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a nitrogen concentration and flow rate automatic control device for underground nitrogen injection operation, including a nitrogen making device known for nitrogen production, two gate valves are installed at the gas outlet of the nitrogen making device, the two gate valves are connected end to end, and the air inlet end of one of the gate valves is connected to the gas outlet of the nitrogen making device, a threaded sleeve is rotatably connected to the inner body of the gate valve, a sink groove plugged into the threaded sleeve is provided on the top edge of the inner valve plate of the gate valve, a screw rod threadedly connected to the inner wall of the threaded sleeve is fixedly connected to the bottom of the sink groove, the side of the gate valve plate is embedded in the same height part of the gate valve body and the nitrogen making device, and the side of the gate valve body is fixedly connected to a partition plugged into the bottom edge of the gate valve plate and flush with the inner wall of the gate valve body.

[0006] Preferably, the top end of the threaded sleeve passes through the top edge of the gate valve body and extends outwardly to be fixedly connected to a first worm gear, and the top edge of the gate valve body is rotatably connected to a first worm that meshes with the first worm gear.

[0007] Preferably, a rectangular frame is fixedly connected between the two gate valves, one end of the first worm gear extends outward to have a protrusion that penetrates the gate valve, and the end face of the protrusion is fixedly connected to a slave bevel gear rotatably connected to the rectangular frame, and a main bevel gear is slidably connected to the rectangular frame for meshing with the slave bevel gear.

[0008] Preferably, a sliding seat for mounting a main bevel gear is rotatably connected to the upper surface of the rectangular frame, a motor for driving the sliding seat to rotate is plugged into the bottom edge of the sliding seat, and a first electric push rod for driving the motor to move is fixedly connected to one of the gate valves.

[0009] Preferably, a second worm gear for fixedly mounting the main bevel gear is rotatably connected to the upper surface of the sliding seat, and a second worm gear meshing with the second worm gear is rotatably connected to the sliding seat.

[0010] Preferably, one end of the second worm gear extends outward and is fixedly connected to a spur gear, a rack meshing with the spur gear is slidably connected to the sliding seat, and a second electric push rod for cooperating with the rack is installed on the sliding seat.

[0011] Preferably, distance measuring sensors are fixedly connected to both sides of the bottom edge of the valve plate inside the gate valve.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. In the utility model, after optimizing the nitrogen concentration and flow control process generated by the nitrogen injection operation, the nitrogen flow and concentration generated by the nitrogen injection operation are intelligently regulated in real time and the nitrogen production operation is intelligently controlled while maximizing the qualified nitrogen flow. During the nitrogen injection operation, the nitrogen injection operator does not need to observe the nitrogen injection concentration and adjust the nitrogen injection regulating gate valve at all times, which reduces the workload of the nitrogen injection operator, improves the stability and safety and reliability of the nitrogen production operation, fundamentally prevents unqualified nitrogen from entering the goaf, and effectively improves the preventive nitrogen injection fire prevention effect.

[0014] 2. In the utility model, by setting a rectangular frame, the reciprocating movement of the motor can be realized, and then the main bevel gear on the motor can be meshed with any slave bevel gear, that is, the number of motors is reduced, and one motor is used to selectively drive one of the gate valve switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model provides a three-dimensional structural schematic diagram of a nitrogen concentration and flow automatic control device for underground nitrogen injection operation;

[0016] Figure 2 The utility model proposes a nitrogen concentration and flow automatic control device for underground nitrogen injection operation Figure 1 A schematic cross-sectional structure diagram of;

[0017] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0018] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0019] Figure 5 The utility model proposes a nitrogen concentration and flow automatic control device for underground nitrogen injection operation Figure 2 Schematic diagram of the structure viewed from above.

[0020] Legend: 1. Nitrogen production equipment; 2. Gate valve; 3. First worm gear; 4. First electric push rod; 5. Threaded sleeve; 6. Motor; 7. First worm; 8. Lead screw; 9. Sink; 10. Second worm gear; 11. Distance sensor; 12. Main bevel gear; 13. Rectangular frame; 14. Slave bevel gear; 15. Partition; 16. Rack; 17. Spur gear; 18. Second worm; 19. Sliding seat; 20. Second electric push rod. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0023] like Figure 1-5As shown, a nitrogen concentration and flow rate automatic control device for underground nitrogen injection operation includes a nitrogen making device 1 known for nitrogen production, wherein the nitrogen making device 1 refers to an existing product, such as the NZN-80 high-purity cutting nitrogen making device produced by Hangzhou Newzhuo Technology Group Co., Ltd. Two gate valves 2 are installed at the gas outlet of the nitrogen making device 1, wherein one of the gate valves 2 is used to simulate the opening height, and the gate valve 2 opening height analog data is transmitted to a known programmable controller in the nitrogen making device 1, and the programmable controller program of the nitrogen making device 1 is modified to realize the linkage between the gate valve 2 and the known nitrogen sensor in the nitrogen making device 1, so as to achieve automatic control of the nitrogen flow rate and concentration of the nitrogen making device 1. At this time, the nitrogen making device 1 is not connected to the underground space, and sufficient reaction time and operation time can flow out for automatic control of the nitrogen flow rate and concentration of the nitrogen making device 1. Then, the opening height of the other gate valve 2 is controlled to be consistent with the previous gate valve 2 opening height, so that the nitrogen that has been regulated in the nitrogen making device 1 can be transported to the underground, and its function is to prevent the gate valve 2 from being opened suddenly. When the gate valve 2 is opened Some time ago, the nitrogen production flow and concentration of the nitrogen making equipment 1 could not meet the standards, affecting the efficiency. The two gate valves 2 were connected end to end, and the air inlet end of one of the gate valves 2 was connected to the air outlet of the nitrogen making equipment 1. A threaded sleeve 5 was rotatably connected in the valve body of the gate valve 2. A sinking groove 9 was provided on the top edge of the valve plate in the gate valve 2 to be plugged into the threaded sleeve 5. A screw rod 8 was fixedly connected to the bottom of the sinking groove 9 to be threadedly connected to the inner wall of the threaded sleeve 5. The screw rod 8 threadedly connected to the threaded sleeve 5 is rotated to drive the valve plate of the gate valve 2 to rise and fall in the valve body of the gate valve 2. The side of the valve plate 2 is embedded in the valve body of the gate valve 2 at the same height as the nitrogen making equipment 1, and the side of the valve body of the gate valve 2 is fixedly connected with a partition 15 which is plugged into the bottom edge of the valve plate of the gate valve 2 and is flush with the inner wall of the valve body of the gate valve 2. As shown in the figure, the partition 15 ensures that the valve plate of the gate valve 2 will not tilt when it is lifted or lowered. The two sides of the bottom edge of the valve plate in the gate valve 2 are fixedly connected with distance sensors 11. The distance sensor 11 can be an infrared distance sensor. The distance sensor 11 is used to measure the lifting height of the valve plate of the gate valve 2 when the first worm gear 3 rotates a corresponding number of times.

[0024] Further discussion: The top end of the threaded sleeve 5 passes through the top edge of the valve body of the gate valve 2, and extends outward and is fixedly connected to the first worm wheel 3. The top edge of the valve body of the gate valve 2 is rotatably connected to the first worm 7 which meshes with the first worm wheel 3. The first worm wheel 3 which is meshed with the first worm wheel 3 rotates through the rotation of the first worm 7, and then the threaded sleeve 5 rotates. Conversely, the self-locking property between the worm wheel and the worm is utilized to ensure that the threaded sleeve 5 will not rotate actively, thereby ensuring that the internal screw 8 and the valve plate of the gate valve 2 will not rise or fall actively under the action of gravity.

[0025] Further discussion: A rectangular frame 13 is fixedly connected between the two gate valves 2, one end of the first worm 7 extends outward to have a protrusion that penetrates the gate valve 2, and the end face of the protrusion is fixedly connected to a slave bevel gear 14 rotatably connected to the rectangular frame 13, and a main bevel gear 12 for meshing with the slave bevel gear 14 is slidably connected to the rectangular frame 13. By moving the main bevel gear 12 to mesh with any one of the slave bevel gears 14, the slave bevel gear 14 can be driven to rotate by the main bevel gear 12, thereby realizing the rotation of the first worm 7 at the corresponding position.

[0026] A sliding seat 19 for mounting the main bevel gear 12 is rotatably connected to the upper surface of the rectangular frame 13, and a motor 6 for driving the sliding seat 19 to rotate is plugged into the bottom edge of the sliding seat 19. A first electric push rod 4 for driving the motor 6 to move is fixedly connected to one of the gate valves 2. The motor 6 slides along the bottom edge of the rectangular frame 13 by telescoping the first electric push rod 4 on the gate valve 2, and reciprocates between the two slave bevel gears 14, while the sliding seat 19 moves with the movement of the motor 6, and the sliding seat 19 is driven to rotate by the motor 6. The number of revolutions of the motor 6 is controlled, thereby controlling the number of revolutions of the sliding seat 19.

[0027] The upper surface of the sliding seat 19 is rotatably connected to a second worm gear 10 for fixing the main bevel gear 12, and the sliding seat 19 is rotatably connected to a second worm 18 meshing with the second worm gear 10. When the sliding seat 19 moves close to one of the slave bevel gears 14, the second worm 18 is used to drive the second worm gear 10 to rotate, so that the main bevel gear 12 can be rotated on the surface of the sliding seat 19, ensuring that the teeth of the main bevel gear 12 and the slave bevel gear 14 are aligned, so as to ensure smooth meshing, and when the second worm 18 stops rotating, the corresponding second worm gear 10 cannot rotate, so the second worm gear 10 and the main bevel gear 12 can rotate with the rotation of the sliding seat 19.

[0028] One end of the second worm 18 extends outward and is fixedly connected to a spur gear 17, a rack 16 meshing with the spur gear 17 is slidably connected to the sliding seat 19, and a second electric push rod 20 for cooperating with the rack 16 is installed on the sliding seat 19. The second electric push rod 20 on the surface of the sliding seat 19 is driven to rotate by installing a mobile power supply on the sliding seat 19, and the rack 16 is moved by the extension and retraction of the second electric push rod 20 on the surface of the sliding seat 19, thereby realizing the spur gear 17 driving the second worm 18 to rotate.

[0029] Working principle: the motor 6 moves to the main bevel gear 12 and meshes with one of the slave bevel gears 14, and then the motor 6 drives the sliding seat 19 to drive the main bevel gear 12 to rotate, thereby realizing that the slave bevel gear 14 drives the first worm 7 to rotate, and the first worm 7 rotates to realize the rotation of the meshing first worm wheel 3, thereby realizing the rotation of the threaded sleeve 5, and through the rotation of the threaded sleeve 5, the screw rod 8 threadedly connected thereto drives the valve plate of the gate valve 2 to rise and fall in the valve body of the gate valve 2 to open to a certain height, and transmits the gate valve 2 opening height analog data to the known programmable controller in the nitrogen making equipment 1, and the nitrogen making equipment 1 can be modified. The programming controller program automatically adjusts and controls the nitrogen production flow and concentration of the nitrogen equipment 1, and then the motor 6 moves to the main bevel gear 12 to mesh with its other slave bevel gear 14, and then the motor 6 drives the sliding seat 19 to drive the main bevel gear 12 to rotate, thereby realizing that the other slave bevel gear 14 drives the other first worm 7 to rotate, and the other first worm 7 rotates to realize the rotation of the other meshing connected first worm wheel 3, thereby realizing the rotation of the other threaded sleeve 5, and through the rotation of the other threaded sleeve 5, the other screw rod 8 threadedly connected thereto drives the other gate valve 2 valve plate to rise and fall in the valve body of the gate valve 2 to open to a corresponding height.

[0030] The wiring diagram of the nitrogen making equipment 1, the first electric push rod 4, the second electric push rod 20, the motor 6 and the distance sensor 11 in the utility model belongs to the common knowledge in the field, and its working principle is a well-known technology. The model is selected according to the actual use. Therefore, the control method and wiring arrangement of the nitrogen making equipment 1, the first electric push rod 4, the second electric push rod 20, the motor 6 and the distance sensor 11 are no longer explained in detail.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A device for automatically controlling nitrogen concentration and flow rate in downhole nitrogen injection operation, comprising a nitrogen making device (1) known for nitrogen production, characterized in that: Two gate valves (2) are installed at the gas outlet of the nitrogen generating equipment (1), the two gate valves (2) are connected end to end, and the gas inlet end of one of the gate valves (2) is connected to the gas outlet of the nitrogen generating equipment (1), a threaded sleeve (5) is rotatably connected in the valve body of the gate valve (2), a recessed groove (9) plugged into the threaded sleeve (5) is provided on the top edge of the valve plate inside the gate valve (2), a screw rod (8) threadedly connected to the inner wall of the threaded sleeve (5) is fixedly connected to the bottom of the recessed groove (9), the side edge of the valve plate of the gate valve (2) is embedded in the part of the gate valve (2) valve body that is equal in height to the nitrogen generating equipment (1), and a partition plate (15) plugged into the bottom edge of the valve plate of the gate valve (2) and flush with the inner wall of the valve body of the gate valve (2) is fixedly connected to the side edge of the valve body of the gate valve (2).

2. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 1 is characterized in that: The top end of the threaded sleeve (5) penetrates the top edge of the valve body of the gate valve (2) and extends outward to be fixedly connected to a first worm gear (3); the top edge of the valve body of the gate valve (2) is rotatably connected to a first worm (7) that meshes with the first worm gear (3).

3. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 2 is characterized in that: A rectangular frame (13) is fixedly connected between the two gate valves (2); one end of the first worm (7) extends outward to form a protrusion that penetrates the gate valve (2); and the end surface of the protrusion is fixedly connected to a slave bevel gear (14) that is rotatably connected to the rectangular frame (13); and a main bevel gear (12) that is used for meshing with the slave bevel gear (14) is slidably connected to the rectangular frame (13).

4. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 3 is characterized in that: A sliding seat (19) for mounting a main bevel gear (12) is rotatably connected to the upper surface of the rectangular frame (13); a motor (6) for driving the sliding seat (19) to rotate is plugged into the bottom edge of the sliding seat (19); and a first electric push rod (4) for driving the motor (6) to move is fixedly connected to one of the gate valves (2).

5. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 4 is characterized in that: The upper surface of the sliding seat (19) is rotatably connected to a second worm wheel (10) for fixedly mounting the main bevel gear (12), and the sliding seat (19) is rotatably connected to a second worm (18) meshing with the second worm wheel (10).

6. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 5 is characterized in that: One end of the second worm (18) extends outward and is fixedly connected to a spur gear (17); a rack (16) meshingly connected to the spur gear (17) is slidably connected to the sliding seat (19); and a second electric push rod (20) for cooperating with the rack (16) is mounted on the sliding seat (19).

7. The automatic control device for nitrogen concentration and flow rate of downhole nitrogen injection operation according to claim 1 is characterized by: Distance measuring sensors (11) are fixedly connected to positions on both sides of the bottom edge of the valve plate inside the gate valve (2).

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