Monitoring equipment for in-situ coal underground gasification and monitoring method thereof

Abstract

The invention relates to the technical field of coal mining, in particular to monitoring equipment for in-situ coal underground gasification and a monitoring method thereof.The monitoring equipment comprises a supporting frame and a control box, the top of the control box is fixedly connected with the supporting frame, a protection pipe is arranged below the control box, and a sensor is arranged in the protection pipe; the sensor is fixedly connected with the protection pipe through a plurality of mounting columns, the top of the protection pipe is fixedly connected with a plurality of first pull ropes, a second pull rope is arranged above the protection pipe, and the control box is provided with a length adjusting assembly used for adjusting the lengths of the first pull ropes and the second pull rope; a plurality of groups of protection units are arranged on the outer wall of the protection pipe, and each group of protection unit comprises two positioning wheels; airflow in the gas production well is prevented from blowing the protective pipe to make hard contact with the inner wall of the gas production well, the stability and reliability of monitoring equipment at the bottom of the gas production well are improved, the fault rate of the monitoring equipment is reduced, the service life of a sensor is prolonged, the continuous and stable coal underground gasification process is guaranteed, and economic benefits are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to monitoring equipment and a monitoring method for in-situ underground coal gasification. Background Art

[0002] Underground coal gasification (UCG) is the controlled combustion of underground coal, producing combustible gas through the coal's thermochemical reactions. Given my country's relatively rich coal, poor oil, and limited natural gas resources, the development of UCG technology is of great practical significance for alleviating my country's energy crisis and adjusting the country's energy structure. UCG technology constructs an underground coal seam into a closed gasification furnace, with gas injection and production wells installed, forming an integrated system with the gasification channel and coal seam.

[0003] During underground gasification, the temperature, pressure, and product type of the gasifier are key parameters that reflect the gasification reaction. These parameters are crucial for adjusting on-site engineering parameters, and therefore require real-time monitoring. Currently, these parameters are typically monitored by embedding probes in the gasification channel and placing sensors at the bottom of the gas production well.

[0004] Regarding placing sensors at the bottom of gas wells, a search revealed that existing technologies still have certain limitations. For example, Chinese patent publication number CN217950342U discloses a monitoring device for underground coal gasification that can monitor the temperature at the bottom of a gas well in real time. Its technical feature is that it implements a protective function for the temperature sensor through the provision of a buffer spring and a protective shell.

[0005] However, it's worth considering that when the temperature sensor descends to the preset monitoring position, high-temperature airflow passes by it, which can easily cause the sensor and protective housing to vibrate. While the buffer spring and protective housing prevent direct collision between the temperature sensor and the inner wall of the gas well, the protective housing can still collide with the inner wall of the gas well. While the buffer spring reduces the instantaneous impact force caused by hard contact, the airflow constantly passes by the temperature sensor during the gasification process, significantly increasing the frequency of hard contact between the protective housing and the inner wall of the gas well. This instantaneous impact force still reduces the service life of the temperature sensor, adversely affecting the continuity of the underground coal gasification project.

[0006] Therefore, in order to solve the above problems, it is necessary to invent a more stable, reliable and long-life gas well bottom monitoring device and a method of using the same. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a monitoring device and a monitoring method for in-situ underground coal gasification, so as to solve the problem that the instantaneous impact force generated by the above-mentioned hard contact still reduces the service life of the sensor.

[0008] Based on the above objectives, the present invention provides a monitoring device for in-situ underground coal gasification, comprising a support frame and a control box, wherein the top of the control box is fixedly connected to the support frame, a protective tube is provided below the control box, a sensor is provided within the protective tube, and the sensor and the protective tube are fixedly connected via a plurality of mounting columns, a plurality of first pull ropes are fixedly connected to the top of the protective tube, a second pull rope is provided above the protective tube, and a length adjustment assembly for adjusting the length of the first and second pull ropes is installed in the control box; Several groups of protection units are provided on the outer wall of the protection tube, each group of protection units includes two positioning wheels, and the bottom end of the second pull rope is installed with an elastic pressing structure for driving the positioning wheels to press the inner wall of the gas production well.

[0009] Optionally, the elastic pressing structure includes a lifting frame fixedly mounted on the bottom end of the second pull rope, the bottom of the lifting frame is fixedly connected to at least two guide columns, the outer sleeve of the guide column is provided with a support plate and a stopping ring, and the top of the stopping ring contacts the bottom of the support plate, the support plate and the inner wall of the protective tube are fixedly connected, the outer sleeve of the sensor is provided with a pressing ring, and the bottom end of the guide column is fixedly connected to the top of the pressing ring, a number of support blocks are provided in the protective tube, and the number of support blocks and protective units is the same, an inclined surface is provided on the support block, and an inclined surface matching the support block is provided on the outer wall of the pressing ring, and the inclined surface on the support block is in contact with the inclined surface on the pressing ring, a movable plate is fixedly connected to the side of the support block away from the pressing ring, the protective tube is installed with an elastic member matching the movable plate, the movable plate is located between the two positioning wheels in each group of protective units, and the movable plate is installed with an engaging rotation unit adapted to the two adjacent positioning wheels.

[0010] Optionally, the elastic member includes a fixing frame fixedly mounted on the outer wall of the protective tube, and the number of the fixing frame and the movable plate is the same, a sliding groove is provided on the movable plate, a slide is provided in the sliding groove, one side of the slide is fixedly connected to the fixing frame, and the other side of the slide is connected to the inner wall of the sliding groove by a compression spring.

[0011] Optionally, the meshing rotation unit includes support shafts respectively arranged above and below the movable plate, the support shafts and the protective tube are rotatably connected, the two sides of the positioning wheel are rotatably connected with side plates, and the two adjacent side plates are respectively fixedly connected to the corresponding support shafts, the external fixed sleeve of the support shaft is provided with a first gear, the top and bottom of the movable plate are respectively fixedly connected with tooth plates, and the tooth plates are meshed with the corresponding first gears.

[0012] When the first and second pull ropes are simultaneously controlled by the length adjustment component to move the length of the first pull rope and the second pull rope below the control box, the protective tube is lowered to the preset position, and the length adjustment component increases the length of the second pull rope below the control box, and the second pull rope can drive the lifting frame, the guide column and the pressing ring to move downward. Since the initial state of the compression spring is in a compressed state, when the pressing ring moves downward, the compression spring drives the movable plate and the support block to move horizontally relative to the protective tube, and the inclined surface on the pressing ring slides into contact with the inclined surface on the support block, and the movable plate drives the two adjacent tooth plates to move synchronously, and the tooth plate drives the support shaft, the side plate and the positioning wheel to rotate through the first gear, so that the two positioning wheels above and below the movable plate move toward the inner wall of the gas production well. When the two adjacent positioning wheels respectively contact the inner wall of the gas production well, as the pressing ring continues to move downward, the pressing ring no longer supports the support block. At this time, the compression spring applies thrust to the movable plate, so that the positioning wheel elastically presses the production well The positioning wheel is reset to its initial position relative to the protective tube, and the length of the first and second pull ropes located below the control box is synchronously controlled by the length adjustment component, so that the height of the protective tube and the sensor in the gas well can be adjusted again.

[0013] Optionally, the length adjustment assembly includes a first winding roller rotatably installed in the control box, the external fixed sleeve of the first winding roller is provided with two first limit disks, and the top end of the second pull rope is fixedly connected to the first winding roller, a first servo motor is fixedly connected in the control box, the output end of the first servo motor is fixedly connected to the end of the first winding roller, a plurality of second winding rollers are rotatably connected in the control box, the number of second winding rollers and the first pull rope is consistent, and the top end of the first pull rope is fixedly connected to the second winding roller, the external fixed sleeve of the second winding roller is provided with two second limit disks, the control box is installed with a synchronous drive structure for driving the plurality of second winding rollers to rotate synchronously, and the control box is installed with a uniform winding mechanism for driving the first pull rope and the second pull rope to swing back and forth respectively.

[0014] The transmission gear of the second end is connected with the gear train of the transmission gear of the first end and the gear train of the third end is connected with the gear train of the transmission gear of the first end.

[0015] Optionally, the friction transmission component includes a first damping plate fixedly mounted on one end of the connecting shaft toward the first winding roller, a second damping plate fixedly connected to one end of the first winding roller toward the first damping plate, and the second damping plate is in contact with the first damping plate, a first hydraulic telescopic rod is fixedly connected in the control box, and the telescopic end of the first hydraulic telescopic rod is fixedly connected to a first pressing frame adapted to the first damping plate.

[0016] The cam is secured to the bottom of the roll and is adapted to engage the guide rails of the second adjustment plate and the guide rails of the second adjustment plate. The top end of the fourth rotating shaft is fixedly connected to the fourth damping disc in contact with the bottom of the third damping disc, and the second hydraulic telescopic rod is fixedly installed in the control box, and the telescopic end of the second hydraulic telescopic rod is fixedly connected to the second pressing frame adapted for the fourth damping disc, the external fixed sleeve of the fourth rotating shaft is provided with a second gear, and the external fixed sleeve of the third rotating shaft is provided with a third gear, and the control box is rotatably connected with a ring gear, and the second gear and the third gear are both meshed with the ring gear.

[0017] Optionally, the drive unit includes a second servo motor fixedly mounted on the control box, an external fixed sleeve of the second rotating shaft is provided with a worm gear, and an output end of the second servo motor is fixedly connected to a worm meshing with the worm gear.

[0018] Optionally, the sensor may be a temperature sensor, a pressure sensor, a gas composition sensor, etc., or a combination of multiple sensors.

[0019] The present invention also provides a monitoring method for in-situ underground coal gasification, comprising the monitoring device for in-situ underground coal gasification as described above, comprising the following steps: Step 1: Move the entire device to the preset monitoring position, support the device with a support frame, and place the protective pipe into the gas well; Step 2: Using the length adjustment assembly, the lengths of the first pull rope and the second pull rope below the control box are simultaneously controlled, so that the first pull rope drives the protective tube to descend to a preset position; Step 3: After the protection tube and sensor are lowered to the preset position, the length of the second pull rope below the control box is increased by the length adjustment assembly, so that the elastic pressing structure drives the two positioning wheels in each protection unit to move toward the inner wall of the gas production well; Step 4: Finally, each positioning wheel in several groups contacts the inner wall of the gas production well, so that the protection tube and the sensor are fixed relative to the gas production well, and the characteristic parameters are monitored by the sensor.

[0020] The beneficial effects of the present invention are as follows: the length of the first pull rope and the second pull rope below the control box are controlled simultaneously through the length adjustment component, so that the first pull rope drives the protective tube to descend to the preset position; after the protective tube and the sensor descend to the preset position, the length of the second pull rope below the control box is increased through the length adjustment component, so that the elastic pressing structure drives the two positioning wheels in each group of protection units to move toward the inner wall of the gas well, and finally each positioning wheel in several groups contacts the inner wall of the gas well, so that the protective tube and the sensor are fixed relative to the gas well, and when the gas well is discharging gas, the airflow in the gas well is avoided from blowing the protective tube and the inner wall of the gas well into hard contact, thereby improving the stability and reliability of the monitoring equipment at the bottom of the gas well, reducing the failure rate of the monitoring equipment, extending the service life of the temperature sensor, ensuring the continuity and stability of the underground coal gasification process, and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2This is a schematic structural diagram of a cutaway protective tube according to an embodiment of the present invention; Figure 3 This is a structural diagram of the separated slide plate and movable plate according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-section structure of a control box according to an embodiment of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of area A in the middle; Figure 6 This is a structural diagram of the assembly of the second adjustment plate and the first pull rope according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a friction transmission component according to an embodiment of the present invention; Figure 8 Schematic diagram of the structure of the second rotating shaft of an embodiment of the present invention.

[0023] The following are marked in the figure: 1. Support frame; 2. Control box; 3. Protective tube; 4. First pull rope; 5. Sensor; 6. Mounting column; 7. Positioning wheel; 8. Second pull rope; 9. Lifting frame; 10. Guide column; 11. Support plate; 12. Stop ring; 13. Press ring; 14. Support shaft; 15. Side plate; 16. First gear; 17. Movable plate; 18. Support block; 19. Tooth plate; 20. Fixed frame; 21. Slide; 22. Slide plate; 23. Compression spring; 24. First winding roller; 25. First limiting plate; 26. First servo motor; 27. First adjustment plate; 28. First guide plate; 29. Second winding roller; 30. Second limiting plate; 31. Second adjustment plate; 32. Second guide plate; 33. Connecting rod Connecting shaft; 34, first damping plate; 35, second damping plate; 36, first hydraulic telescopic rod; 37, first pressing frame; 38, first sprocket; 39, first rotating shaft; 40, second sprocket; 41, chain; 42, positioning plate; 43, rotating sleeve; 44, first bevel gear; 45, second bevel gear; 46, third bevel gear; 47, second rotating shaft; 48, third rotating shaft; 49, adjusting hole; 50, adjusting column; 51, rotating plate; 52, third damping plate; 53, fourth damping plate; 54, second hydraulic telescopic rod; 55, second pressing frame; 56, fourth rotating shaft; 57, second gear; 58, third gear; 59, ring gear; 60, second servo motor; 61, worm; 62, worm wheel. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0025] This embodiment proposes a monitoring device for in-situ underground coal gasification, such as Figure 1 and Figure 2As shown, it includes a support frame 1 and a control box 2. The top of the control box 2 is fixedly connected to the support frame 1. A protective tube 3 is provided below the control box 2. A sensor 5 is provided in the protective tube 3. The sensor 5 is fixedly connected to the protective tube 3 through a plurality of mounting columns 6. A plurality of first pull ropes 4 are fixedly connected to the top of the protective tube 3. A second pull rope 8 is provided above the protective tube 3. The control box 2 is installed with a length adjustment component for adjusting the length of the first pull rope 4 and the second pull rope 8. Several groups of protection units are provided on the outer wall of the protection tube 3, each group of protection units includes two positioning wheels 7, and the bottom end of the second pull rope 8 is installed with an elastic pressing structure for driving the positioning wheel 7 to press the inner wall of the gas well; the length of the first pull rope 4 and the second pull rope 8 below the control box 2 is controlled simultaneously by the length adjustment component, so that the first pull rope 4 drives the protection tube 3 to descend to the preset position. When the protection tube 3 and the sensor 5 descend to the preset position, the length of the second pull rope 8 below the control box 2 is increased by the length adjustment component, so that the elastic pressing structure drives the two positioning wheels 7 in each group of protection units to move toward the inner wall of the gas well, and finally makes each positioning wheel 7 in several groups contact with the inner wall of the gas well, so that the protection tube 3 and the sensor 5 are fixed relative to the gas well. When the gas is discharged from the gas well, the airflow in the gas well is avoided from blowing the protection tube 3 and the inner wall of the gas well to hard contact, thereby improving the stability and reliability of the bottom monitoring equipment of the gas well and extending the service life of the sensor 5.

[0026] In some optional specific embodiments, such as Figure 1 、 Figure 2 and Figure 3As shown, the elastic pressing structure includes a lifting frame 9 fixedly mounted on the bottom end of the second pull rope 8, and at least two guide columns 10 are fixedly connected to the bottom of the lifting frame 9. The outer sleeve of the guide column 10 is provided with a support plate 11 and a stop ring 12, and the top of the stop ring 12 is in contact with the bottom of the support plate 11, the support plate 11 and the inner wall of the protective tube 3 are fixedly connected, the outer sleeve of the sensor 5 is provided with a pressing ring 13, and the bottom end of the guide column 10 is fixedly connected to the top of the pressing ring 13, a plurality of support blocks 18 are provided in the protective tube 3, and the number of support blocks 18 and the number of protective units are the same, an inclined surface is provided on the support block 18, and an inclined surface matching the support block 18 is provided on the outer wall of the pressing ring 13, and the inclined surface on the support block 18 is in contact with the inclined surface on the pressing ring 13, a movable plate 17 is fixedly connected to the side of the support block 18 away from the pressing ring 13, and the protective tube 3 is installed with an elastic member matching the movable plate 17, and the movable plate 17 is located at each group of protective Between the two positioning wheels 7 in the unit, a meshing rotation unit adapted to the two adjacent positioning wheels 7 is installed on the movable plate 17, the elastic member includes a fixing frame 20 fixedly mounted on the outer wall of the protective tube 3, and the number of the fixing frame 20 and the movable plate 17 is the same, a slide groove 21 is provided on the movable plate 17, a slide plate 22 is provided in the slide groove 21, one side of the slide plate 22 is fixedly connected to the fixing frame 20, and the other side of the slide plate 22 is connected to the inner wall of the slide groove 21 by a compression spring 23, the meshing rotation unit includes support shafts 14 respectively arranged above and below the movable plate 17, the support shaft 14 is rotatably connected to the protective tube 3, the two sides of the positioning wheel 7 are rotatably connected to the side plates 15, and the adjacent two side plates 15 are respectively fixedly connected to the corresponding support shafts 14, the outer fixed sleeve of the support shaft 14 is provided with a first gear 16, the top and bottom of the movable plate 17 are respectively fixedly connected to tooth plates 19, and the tooth plates 19 are meshed with the corresponding first gear 16; When the length of the first pull rope 4 and the second pull rope 8 below the control box 2 is controlled simultaneously by the length adjustment component to make the protective tube 3 drop to the preset position, the length of the second pull rope 8 below the control box 2 is increased by the length adjustment component, and the second pull rope 8 can drive the lifting frame 9, the guide column 10 and the pressing ring 13 to move downward. Since the initial state of the compression spring 23 is in a compressed state, when the pressing ring 13 moves downward, the compression spring 23 drives the movable plate 17 and the support block 18 to move horizontally relative to the protective tube 3, and the inclined surface on the pressing ring 13 is aligned with the support block 18. The inclined surface on the support block 18 is in sliding contact, and the movable plate 17 drives the two adjacent tooth plates 19 to move synchronously. The tooth plate 19 drives the support shaft 14, the side plate 15 and the positioning wheel 7 to rotate through the first gear 16, so that the two positioning wheels 7 above and below the movable plate 17 move toward the inner wall of the gas production well. When the two adjacent positioning wheels 7 are in contact with the inner wall of the gas production well respectively, as the pressing ring 13 continues to move downward, the pressing ring 13 no longer supports the support block 18. At this time, the compression spring 23 applies a thrust to the movable plate 17, so that the positioning wheel 7 elastically presses By pressing the inner wall of the gas production well, the protection pipe 3 and the sensor 5 can be fixed relative to the gas production well. When the protection pipe 3 and the sensor 5 need to be moved to another height, the length of the second pull rope 8 below the control box 2 is reduced by the length adjustment component, so that the second pull rope 8 drives the lifting frame 9, the guide column 10 and the pressing ring 13 to move upward. As the pressing ring 13 continues to move upward, the inclined surface on the pressing ring 13 slides into contact with the inclined surface on the support block 18, and the pressing ring 13 pushes the support block 18 and the movable plate 17 to move in the opposite direction horizontally, and the slide plate 22 is added to the movable plate 17. The movable plate 17 can drive the two adjacent positioning wheels 7 to move through the tooth plate 19 and the first gear 16, so that the positioning wheel 7 is no longer in close contact with the inner wall of the gas well, until the pressing ring 13 moves up to the initial position relative to the protective tube 3, the top of the stop ring 12 and the bottom of the support plate 11 are in contact, and the positioning wheel 7 is reset to the initial position relative to the protective tube 3. The length of the first pull rope 4 and the second pull rope 8 below the control box 2 is synchronously controlled by the length adjustment component, so that the height of the protective tube 3 and the sensor 5 in the gas well can be adjusted again.

[0027] In some optional specific embodiments, such as Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the length adjustment component includes a first winding roller 24 rotatably installed in the control box 2, the outer fixed sleeve of the first winding roller 24 is provided with two first limit disks 25, and the top end of the second pull rope 8 is fixedly connected to the first winding roller 24, and a first servo motor 26 is fixedly connected to the control box 2, and the output end of the first servo motor 26 is fixedly connected to the end of the first winding roller 24, and a plurality of second winding rollers 29 are rotatably connected in the control box 2, the number of the second winding rollers 29 and the first pull rope 4 is the same, and the top end of the first pull rope 4 and the second winding roller 29 are fixedly connected, the outer fixed sleeve of the second winding roller 29 is provided with two second limit disks 30, and the control box 2 is installed with a synchronous drive structure for driving the plurality of second winding rollers 29 to rotate synchronously. It is equipped with a uniform winding mechanism that drives the first pull rope 4 and the second pull rope 8 to swing back and forth respectively. The synchronous drive structure includes a connecting shaft 33 and a first rotating shaft 39 rotatably installed in the control box 2. The connecting shaft 33 is fixedly installed with a first sprocket 38. The first rotating shaft 39 is fixedly installed with a second sprocket 40. The second sprocket 40 and the first sprocket 38 are connected by a chain 41. The outer sleeve of the second pull rope 8 is provided with a rotating sleeve 43 located in the control box 2, and the rotating sleeve 43 is rotatably connected to the control box 2. The outer fixed sleeve of the rotating sleeve 43 is provided with a first bevel gear 44. The first rotating shaft 39 is fixedly installed with a second bevel gear 45 that meshes with the first bevel gear 44. The second winding roller 29 is fixedly installed with a third bevel gear 46 that meshes with the first bevel gear 44. The upper sleeve of the rotating sleeve 43 A positioning plate 42 is provided on the side, which is fixedly connected to the inner wall of the control box 2. The second pull rope 8 passes through the positioning plate 42, and the positioning plate 42 is located above the second bevel gear 45 and the third bevel gear 46. The control box 2 is equipped with a friction transmission member that cooperates with the connecting shaft 33 and the first winding roller 24 respectively. The friction transmission member includes a first damping disc 34 fixedly mounted on the connecting shaft 33 toward one end of the first winding roller 24. The first winding roller 24 is fixedly connected to the second damping disc 35 at one end facing the first damping disc 34, and the second damping disc 35 is in contact with the first damping disc 34. A first hydraulic telescopic rod 36 is fixedly connected to the control box 2, and the telescopic end of the first hydraulic telescopic rod 36 is fixedly connected to the first pressing frame 37 that is adapted to the first damping disc 34, so that the winding is evenly The winding mechanism includes a first adjustment plate 27 arranged below the first winding roller 24, and the second pull rope 8 passes through the first adjustment plate 27, a first guide plate 28 passes through the first adjustment plate 27, a second adjustment plate 31 is provided below the second winding roller 29, and the first pull rope 4 passes through the second adjustment plate 31, a second guide plate 32 passes through the second adjustment plate 31, and the first guide plate 28 and the second guide plate 32 are both fixedly connected to the inner wall of the control box 2, a second rotating shaft 47 is provided below the first adjustment plate 27, a third rotating shaft 48 is provided below the second adjustment plate 31, and the second rotating shaft 47 and the third rotating shaft 48 are both rotatably connected to the control box 2, an adjustment hole 49 is respectively opened on the first adjustment plate 27 and the second adjustment plate 31, an adjustment column 50 is provided in the adjustment hole 49,The tops of the second rotating shaft 47 and the third rotating shaft 48 are respectively fixedly connected with a rotating plate 51, the bottom of the adjusting column 50 is fixedly connected to the top of the corresponding rotating plate 51, the control box 2 is equipped with a driving unit adapted to the second rotating shaft 47, the bottom end of the second rotating shaft 47 is fixedly connected with a third damping disk 52, the control box 2 is rotatably connected with a fourth rotating shaft 56, the top of the fourth rotating shaft 56 is fixedly connected with a fourth damping disk 53 in contact with the bottom of the third damping disk 52, the control box 2 is fixedly equipped with a second hydraulic telescopic rod 54, the extension of the second hydraulic telescopic rod 54 The retracted end is fixedly connected to a second pressing frame 55 adapted to the fourth damping disc 53, the outer fixed sleeve of the fourth rotating shaft 56 is provided with a second gear 57, the outer fixed sleeve of the third rotating shaft 48 is provided with a third gear 58, a ring gear 59 is rotatably connected to the control box 2, and the second gear 57 and the third gear 58 are both engaged with the ring gear 59, the drive unit includes a second servo motor 60 fixedly mounted on the control box 2, the outer fixed sleeve of the second rotating shaft 47 is provided with a worm gear 62, and the output end of the second servo motor 60 is fixedly connected to a worm 61 engaged with the worm gear 62; The first servo motor 26 drives the first winding roller 24 to rotate, and the length of the second pull rope 8 wound on the first winding roller 24 can be controlled. At the same time, the first winding roller 24 drives the second damping plate 35 to rotate. The second damping plate 35 drives the first damping plate 34, the connecting shaft 33 and the first sprocket 38 to rotate through the friction force. The first sprocket 38 drives the second sprocket 40, the first rotating shaft 39 and the second bevel gear 45 to rotate through the chain 41. The second bevel gear 45 can drive several third bevel gears 46 to rotate synchronously through the first bevel gear 44. The third bevel gear 46 drives the second winding roller 29 to rotate, and the length of the first pull rope 4 wound on the second winding roller 29 can be controlled. The second servo motor 60 drives the worm 61 to rotate, and the worm 61 drives the worm gear 62 The second rotating shaft 47 is driven to rotate, and the second rotating shaft 47 drives the adjusting column 50 to slide back and forth in the adjusting hole 49 through the corresponding rotating plate 51, and the adjusting column 50 located above the second rotating shaft 47 pushes the first adjusting plate 27 to move back and forth relative to the first guide plate 28, so that the second pull rope 8 located in the control box 2 swings back and forth, so that the second pull rope 8 can be evenly unwound on the first winding roller 24. The position of the second pull rope 8 is limited by the design of the positioning plate 42. Since the positioning plate 42 is located above the second bevel gear 45 and the third bevel gear 46, the second pull rope 8 located below the positioning plate 42 can be prevented from swinging back and forth, thereby preventing the second pull rope 8 from touching the second bevel gear 45 and the third bevel gear 46. At the same time, the second rotating shaft 47 drives the third damping disk. 52 rotates, the third damping disc 52 drives the fourth damping disc 53, the fourth rotating shaft 56 and the second gear 57 to rotate through the friction force, the second gear 57 drives several third gears 58 to rotate synchronously through the ring gear 59, and the third gear 58 drives the corresponding rotating plate 51 and the adjusting column 50 to rotate through the third rotating shaft 48. The adjusting column 50 slides back and forth in the adjusting hole 49, and the adjusting column 50 located above the third rotating shaft 48 can push the second adjusting plate 31 to move back and forth relative to the second guide plate 32, so that the first pull rope 4 located in the control box 2 swings back and forth, which can make the first pull rope 4 evenly unwound on the second winding roller 29. Since the first winding roller 24 and the second winding roller 29 rotate synchronously, the first pull rope 4 and the second pull rope 8 can be controlled to be in the control position at the same time. When the length of the second pull rope 8 below the control box 2 needs to be controlled separately, the first hydraulic telescopic rod 36 drives the first pressing frame 37 to press the first damping disc 34, so that the first damping disc 34 is fixed relative to the control box 2. When the first winding roller 24 and the second damping disc 35 rotate, the second damping disc 35 cannot drive the first damping disc 34 to rotate synchronously by friction. Similarly, the second hydraulic telescopic rod 54 drives the second pressing frame 55 to press the fourth damping disc 53, so that the fourth damping disc 53 is fixed relative to the control box 2. When the second rotating shaft 47 and the third damping disc 52 rotate, the third damping disc 52 cannot drive the fourth damping disc 53 to rotate synchronously by friction. Therefore, when the first servo motor 26 and the second servo motor 60 are started,That is, the first winding roller 24 can be rotated independently, and the first adjustment plate 27 can be driven to move back and forth independently, so that the length of the second pull rope 8 below the control box 2 can be controlled independently.

[0028] In some optional embodiments, such as Figure 1 and Figure 2 As shown, the sensor 5 can be a temperature sensor, a pressure sensor, a gas composition sensor, etc., or a combination of multiple sensors.

[0029] This embodiment also provides a monitoring method for in-situ underground coal gasification, including the above-mentioned monitoring device for in-situ underground coal gasification, comprising the following steps: Step 1: Move the entire device to the preset monitoring position, support the device with the support frame 1, and place the protective pipe 3 into the gas well; Step 2: Use the length adjustment component to simultaneously control the lengths of the first pull rope 4 and the second pull rope 8 below the control box 2, so that the first pull rope 4 drives the protective tube 3 to descend to a preset position; Step 3: After the protection tube 3 and the sensor 5 are lowered to the preset position, the length of the second pull rope 8 below the control box 2 is increased by the length adjustment assembly, so that the elastic pressing structure drives the two positioning wheels 7 in each protection unit group to move toward the inner wall of the gas production well; Step 4: Finally, each positioning wheel 7 in several groups contacts the inner wall of the gas production well, so that the protection tube 3 and the sensor 5 are fixed relative to the gas production well, and the characteristic parameters are monitored by the sensor 5.

[0030] Working principle: Move the entire device to the preset monitoring position, support the device through the support frame 1, put the protective tube 3 into the gas well, and control the length of the first pull rope 4 and the second pull rope 8 below the control box 2 at the same time through the length adjustment component, so that the first pull rope 4 drives the protective tube 3 to descend to the preset position. When the protective tube 3 and the sensor 5 descend to the preset position, increase the length of the second pull rope 8 below the control box 2 through the length adjustment component, so that the elastic pressing structure drives the two positioning wheels 7 in each group of protection units to move toward the inner wall of the gas well, and finally makes each positioning wheel 7 in several groups contact with the inner wall of the gas well, so that the protective tube 3 and the sensor 5 are fixed relative to the gas well. When the gas well is discharging gas, the airflow in the gas well is prevented from blowing the protective tube 3 and the inner wall of the gas well into hard contact, thereby improving the stability and reliability of the gas well bottom monitoring equipment and extending the service life of the sensor 5. When the length of the first pull rope 4 and the second pull rope 8 below the control box 2 is controlled simultaneously by the length adjustment component to make the protective tube 3 drop to the preset position, the length of the second pull rope 8 below the control box 2 is increased by the length adjustment component, and the second pull rope 8 can drive the lifting frame 9, the guide column 10 and the pressing ring 13 to move downward. Since the initial state of the compression spring 23 is in a compressed state, when the pressing ring 13 moves downward, the compression spring 23 drives the movable plate 17 and the support block 18 to move horizontally relative to the protective tube 3, and the inclined surface on the pressing ring 13 is aligned with the support block 18. The inclined surface on the support block 18 is in sliding contact, and the movable plate 17 drives the two adjacent tooth plates 19 to move synchronously. The tooth plate 19 drives the support shaft 14, the side plate 15 and the positioning wheel 7 to rotate through the first gear 16, so that the two positioning wheels 7 above and below the movable plate 17 move toward the inner wall of the gas production well. When the two adjacent positioning wheels 7 are in contact with the inner wall of the gas production well respectively, as the pressing ring 13 continues to move downward, the pressing ring 13 no longer supports the support block 18. At this time, the compression spring 23 applies a thrust to the movable plate 17, so that the positioning wheel 7 elastically presses By pressing the inner wall of the gas production well, the protection pipe 3 and the sensor 5 can be fixed relative to the gas production well. When the protection pipe 3 and the sensor 5 need to be moved to another height, the length of the second pull rope 8 below the control box 2 is reduced by the length adjustment component, so that the second pull rope 8 drives the lifting frame 9, the guide column 10 and the pressing ring 13 to move upward. As the pressing ring 13 continues to move upward, the inclined surface on the pressing ring 13 slides into contact with the inclined surface on the support block 18, and the pressing ring 13 pushes the support block 18 and the movable plate 17 to move in the opposite direction horizontally, and the slide plate 22 is added to the movable plate 17. When the length of the movable plate 17 is adjusted, the movable plate 17 can drive the two adjacent positioning wheels 7 to move through the tooth plate 19 and the first gear 16, so that the positioning wheels 7 are no longer in close contact with the inner wall of the gas production well, until the pressing ring 13 moves up to the initial position relative to the protection tube 3, the top of the stop ring 12 contacts the bottom of the support plate 11, and the positioning wheel 7 is reset to the initial position relative to the protection tube 3. The length of the first pull rope 4 and the second pull rope 8 below the control box 2 is synchronously controlled by the length adjustment component, so that the height of the protection tube 3 and the sensor 5 in the gas production well can be adjusted again; The first servo motor 26 drives the first winding roller 24 to rotate, and the length of the second pull rope 8 wound on the first winding roller 24 can be controlled. At the same time, the first winding roller 24 drives the second damping plate 35 to rotate. The second damping plate 35 drives the first damping plate 34, the connecting shaft 33 and the first sprocket 38 to rotate through the friction force. The first sprocket 38 drives the second sprocket 40, the first rotating shaft 39 and the second bevel gear 45 to rotate through the chain 41. The second bevel gear 45 can drive several third bevel gears 46 to rotate synchronously through the first bevel gear 44. The third bevel gear 46 drives the second winding roller 29 to rotate, and the length of the first pull rope 4 wound on the second winding roller 29 can be controlled. The second servo motor 60 drives the worm 61 to rotate, and the worm 61 drives the worm gear 62 The second rotating shaft 47 is driven to rotate, and the second rotating shaft 47 drives the adjusting column 50 to slide back and forth in the adjusting hole 49 through the corresponding rotating plate 51, and the adjusting column 50 located above the second rotating shaft 47 pushes the first adjusting plate 27 to move back and forth relative to the first guide plate 28, so that the second pull rope 8 located in the control box 2 swings back and forth, so that the second pull rope 8 can be evenly unwound on the first winding roller 24. The position of the second pull rope 8 is limited by the design of the positioning plate 42. Since the positioning plate 42 is located above the second bevel gear 45 and the third bevel gear 46, the second pull rope 8 located below the positioning plate 42 can be prevented from swinging back and forth, thereby preventing the second pull rope 8 from touching the second bevel gear 45 and the third bevel gear 46. At the same time, the second rotating shaft 47 drives the third damping disk. 52 rotates, the third damping disc 52 drives the fourth damping disc 53, the fourth rotating shaft 56 and the second gear 57 to rotate through the friction force, the second gear 57 drives several third gears 58 to rotate synchronously through the ring gear 59, and the third gear 58 drives the corresponding rotating plate 51 and the adjusting column 50 to rotate through the third rotating shaft 48. The adjusting column 50 slides back and forth in the adjusting hole 49, and the adjusting column 50 located above the third rotating shaft 48 can push the second adjusting plate 31 to move back and forth relative to the second guide plate 32, so that the first pull rope 4 located in the control box 2 swings back and forth, which can make the first pull rope 4 evenly unwound on the second winding roller 29. Since the first winding roller 24 and the second winding roller 29 rotate synchronously, the first pull rope 4 and the second pull rope 8 can be controlled to be in the control position at the same time. When the length of the second pull rope 8 below the control box 2 needs to be controlled separately, the first hydraulic telescopic rod 36 drives the first pressing frame 37 to press the first damping disc 34, so that the first damping disc 34 is fixed relative to the control box 2. When the first winding roller 24 and the second damping disc 35 rotate, the second damping disc 35 cannot drive the first damping disc 34 to rotate synchronously by friction. Similarly, the second hydraulic telescopic rod 54 drives the second pressing frame 55 to press the fourth damping disc 53, so that the fourth damping disc 53 is fixed relative to the control box 2. When the second rotating shaft 47 and the third damping disc 52 rotate, the third damping disc 52 cannot drive the fourth damping disc 53 to rotate synchronously by friction. Therefore, when the first servo motor 26 and the second servo motor 60 are started,That is, the first winding roller 24 can be rotated independently, and the first adjustment plate 27 can be driven to move back and forth independently, so that the length of the second pull rope 8 below the control box 2 can be controlled independently.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. A monitoring device for in-situ underground coal gasification, comprising a support frame (1) and a control box (2), characterized in that: The top of the control box (2) is fixedly connected to the support frame (1), a protective tube (3) is provided below the control box (2), a sensor (5) is provided in the protective tube (3), the sensor (5) is fixedly connected to the protective tube (3) via a plurality of mounting columns (6), a plurality of first pull ropes (4) are fixedly connected to the top of the protective tube (3), a second pull rope (8) is provided above the protective tube (3), and a length adjustment component for adjusting the length of the first pull rope (4) and the second pull rope (8) is installed on the control box (2); Several groups of protection units are provided on the outer wall of the protection tube (3), each group of protection units includes two positioning wheels (7), and the bottom end of the second pull rope (8) is installed with an elastic pressing structure for driving the positioning wheels (7) to press the inner wall of the gas production well.

2. The monitoring device for in-situ underground coal gasification according to claim 1, characterized in that: The elastic pressing structure includes a lifting frame (9) fixedly mounted on the bottom end of the second pull rope (8), at least two guide columns (10) are fixedly connected to the bottom of the lifting frame (9), the guide columns (10) are externally sleeved with a support plate (11) and a stop ring (12), and the top of the stop ring (12) contacts the bottom of the support plate (11), the support plate (11) and the inner wall of the protective tube (3) are fixedly connected, the sensor (5) is externally sleeved with a pressing ring (13), and the bottom end of the guide column (10) and the top of the pressing ring (13) are fixedly connected, a plurality of support blocks (18) are provided in the protective tube (3), and the support blocks ( 18) and the number of protective units are consistent, an inclined surface is provided on the support block (18), an inclined surface matching the support block (18) is provided on the outer wall of the pressing ring (13), and the inclined surface on the support block (18) and the inclined surface on the pressing ring (13) are in contact with each other, a movable plate (17) is fixedly connected to the side of the support block (18) away from the pressing ring (13), the protective tube (3) is equipped with an elastic member matching the movable plate (17), the movable plate (17) is located between the two positioning wheels (7) in each group of protective units, and the movable plate (17) is equipped with a meshing rotation unit matching the two adjacent positioning wheels (7).

3. The monitoring device for in-situ underground coal gasification according to claim 2, characterized in that: The elastic member includes a fixing frame (20) fixedly mounted on the outer wall of the protective tube (3), and the number of the fixing frame (20) and the movable plate (17) is the same. The movable plate (17) is provided with a slide groove (21), and a slide plate (22) is provided in the slide groove (21). One side of the slide plate (22) is fixedly connected to the fixing frame (20), and the other side of the slide plate (22) is connected to the inner wall of the slide groove (21) via a compression spring (23).

4. The monitoring device for in-situ underground coal gasification according to claim 2, characterized in that: The meshing rotation unit comprises support shafts (14) respectively arranged above and below the movable plate (17); the support shaft (14) and the protective tube (3) are rotatably connected; the two sides of the positioning wheel (7) are rotatably connected to the side plates (15), and the two adjacent side plates (15) are respectively fixedly connected to the corresponding support shafts (14); the outer fixed sleeve of the support shaft (14) is provided with a first gear (16); the top and bottom of the movable plate (17) are respectively fixedly connected to the tooth plates (19), and the tooth plates (19) are meshed with the corresponding first gears (16).

5. The monitoring device for in-situ underground coal gasification according to claim 1, characterized in that: The length adjustment component includes a first winding roller (24) rotatably mounted in a control box (2), an outer fixed sleeve of the first winding roller (24) is provided with two first limit disks (25), and the top end of the second pull rope (8) is fixedly connected to the first winding roller (24), a first servo motor (26) is fixedly connected in the control box (2), an output end of the first servo motor (26) is fixedly connected to the end of the first winding roller (24), a plurality of second winding rollers (29) are rotatably connected in the control box (2), the number of the second winding rollers (29) and the first pull rope (4) is the same, and the top end of the first pull rope (4) is fixedly connected to the second winding roller (29), an outer fixed sleeve of the second winding roller (29) is provided with two second limit disks (30), the control box (2) is provided with a synchronous driving structure for driving the plurality of second winding rollers (29) to rotate synchronously, and the control box (2) is provided with a uniform winding mechanism for driving the first pull rope (4) and the second pull rope (8) to swing back and forth respectively.

6. The monitoring device for in-situ underground coal gasification according to claim 5, characterized in that: The synchronous drive structure comprises a connecting shaft (33) and a first rotating shaft (39) rotatably mounted in the control box (2); the connecting shaft (33) is fixedly mounted with a first sprocket (38); the first rotating shaft (39) is fixedly mounted with a second sprocket (40); the second sprocket (40) and the first sprocket (38) are connected via a chain (41); the outer sleeve of the second pull rope (8) is provided with a rotating sleeve (43) located in the control box (2); the rotating sleeve (43) and the control box (2) are rotatably connected; the outer fixed sleeve of the rotating sleeve (43) is provided with a first bevel gear (44); the first rotating shaft (39) is fixed with a first bevel gear (44); A second bevel gear (45) meshing with the first bevel gear (44) is fixedly installed on the second winding roller (29), and a third bevel gear (46) meshing with the first bevel gear (44) is fixedly installed on the second winding roller (29). A positioning plate (42) is provided above the rotating sleeve (43), and the positioning plate (42) is fixedly connected to the inner wall of the control box (2). The second pull rope (8) passes through the positioning plate (42), and the positioning plate (42) is located above the second bevel gear (45) and the third bevel gear (46). The control box (2) is equipped with friction transmission parts respectively matched with the connecting shaft (33) and the first winding roller (24).

7. The monitoring device for in-situ underground coal gasification according to claim 6, characterized in that: The friction transmission member includes a first damping disc (34) fixedly mounted on one end of the connecting shaft (33) facing the first winding roller (24); a second damping disc (35) is fixedly connected to one end of the first winding roller (24) facing the first damping disc (34); and the second damping disc (35) and the first damping disc (34) are in contact; a first hydraulic telescopic rod (36) is fixedly connected in the control box (2); and a first pressing frame (37) adapted to the first damping disc (34) is fixedly connected to the telescopic end of the first hydraulic telescopic rod (36).

8. The monitoring device for in-situ underground coal gasification according to claim 5, characterized in that: The uniform winding mechanism comprises a first adjustment plate (27) arranged below the first winding roller (24), and the second pull rope (8) passes through the first adjustment plate (27), and the first guide plate (28) passes through the first adjustment plate (27), and a second adjustment plate (31) is provided below the second winding roller (29), and the first pull rope (4) passes through the second adjustment plate (31), and the second guide plate (32) passes through the second adjustment plate (31), and the first guide plate (28) and the second guide plate (32) are arranged on the first adjustment plate (28) and the second guide plate (32). ) are fixedly connected to the inner wall of the control box (2), a second rotating shaft (47) is provided below the first adjustment plate (27), a third rotating shaft (48) is provided below the second adjustment plate (31), and the second rotating shaft (47) and the third rotating shaft (48) are both rotatably connected to the control box (2), an adjustment hole (49) is respectively provided on the first adjustment plate (27) and the second adjustment plate (31), an adjustment column (50) is provided in the adjustment hole (49), and the top of the second rotating shaft (47) and the third rotating shaft (48) The ends of the adjusting columns (50) are fixedly connected to rotating plates (51), the bottom of the adjusting column (50) is fixedly connected to the top of the corresponding rotating plate (51), the control box (2) is equipped with a driving unit adapted to the second rotating shaft (47), the bottom end of the second rotating shaft (47) is fixedly connected to the third damping disc (52), the control box (2) is rotatably connected to the fourth rotating shaft (56), the top end of the fourth rotating shaft (56) is fixedly connected to the fourth damping disc (53) in contact with the bottom of the third damping disc (52), and the control box (2) is provided with a driving unit adapted to the second rotating shaft (47). The control box (2) is fixedly mounted with a second hydraulic telescopic rod (54), the telescopic end of the second hydraulic telescopic rod (54) is fixedly connected with a second pressing frame (55) adapted to the fourth damping disc (53), the outer fixed sleeve of the fourth rotating shaft (56) is provided with a second gear (57), the outer fixed sleeve of the third rotating shaft (48) is provided with a third gear (58), and a gear ring (59) is rotatably connected inside the control box (2), and the second gear (57) and the third gear (58) are both meshed with the gear ring (59).

9. The monitoring device for in-situ underground coal gasification according to claim 8, characterized in that: The drive unit comprises a second servo motor (60) fixedly mounted on the control box (2); an external fixed sleeve of the second rotating shaft (47) is provided with a worm gear (62); and an output end of the second servo motor (60) is fixedly connected to a worm (61) meshing with the worm gear (62).

10. A monitoring method for in-situ underground coal gasification, comprising the monitoring device for in-situ underground coal gasification according to claim 1, characterized in that: The following steps are involved: Step 1: Move the entire device to a preset monitoring position, support the device with a support frame (1), and place the protective pipe (3) into the gas production well; Step 2: Simultaneously controlling the lengths of the first pull rope (4) and the second pull rope (8) located below the control box (2) through the length adjustment component, so that the first pull rope (4) drives the protective tube (3) to descend to a preset position; Step 3: After the protection tube (3) and the sensor (5) are lowered to the preset position, the length of the second pull rope (8) located below the control box (2) is increased by the length adjustment component, so that the elastic pressing structure drives the two positioning wheels (7) in each group of protection units to move toward the inner wall of the gas production well; Step 4: Finally, each positioning wheel (7) in the plurality of groups contacts the inner wall of the gas production well, thereby fixing the protection tube (3) and the sensor (5) relative to the gas production well, and monitoring the required parameters through the sensor (5).

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