Self-expanding hole-protecting and compression-resistant corrugated pipe for gas drainage

Abstract

Self-expanding hole-protecting and compression-resistant perforated pipe for gas drainage, comprising a perforated pipe body uniformly provided with a number of perforations. An annular fixed socket is fixedly arranged on the outer circumference of the left end of the perforated pipe body, and an annular movable socket is slidably arranged on the outer circumference of the right end of the perforated pipe body. A expandable and breathable support structure covering the perforations is arranged between the annular fixed socket and the annular movable socket. An expansion valve assembly for positioning the axial extension or radial expansion position of the annular movable socket is arranged inside the right end of the perforated pipe body. The expansion valve assembly is connected with a rope for driving the expansion valve assembly to be in positioning cooperation with the annular movable socket, and the rope extends leftward along the inside of the perforated pipe body out of the borehole. In the present invention, through the elastic deformation of the spring pieces, the steel wire mesh cloth expands, so as to achieve an expanded space inside the borehole to protect the perforated pipe and solve the problem of perforated pipe blockage; at the same time, the contact area between the perforated pipe and the coal is increased, which is beneficial to gas drainage. The problem of borehole blockage caused by the contact between the perforated pipe and the coal seam is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas drainage, and particularly relates to a self-expanding hole-protecting and compression-resistant perforated pipe for gas drainage. Background Art

[0002] During the process of gas drainage in the underground bottom gas drainage roadway, in order to ensure the normal progress of gas drainage and the gas drainage efficiency, a suitable perforated pipe must be used. During the process of gas drainage with the existing perforated pipe, affected by the soft coal seam, the coal body will cause the perforations on the perforated pipe to be blocked due to the collapse of the hole body. The blockage of the perforations leads to a reduction in gas drainage efficiency and waste of resources. If the blockage cannot be dealt with in time, this borehole will be scrapped and a new borehole needs to be drilled, which increases the labor intensity of workers and the production cost. The use of the existing drainage perforated pipe in the soft coal seam is affected by the characteristics of the coal seam, resulting in a reduction in drainage efficiency and a decrease in the concentration of drained gas, affecting the construction progress of subsequent coal mine mining. Therefore, it is urgent to improve the structure of the existing drainage perforated pipe. Summary of the Invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a self-expanding hole-protecting and compression-resistant perforated pipe for gas drainage, which has a compact structure, is easy to install, convenient to operate, and has a good anti-blocking effect. During the hole-sealing process after the drilling is completed, the compression-resistant perforated pipe is pushed between the coal seams and is used during the gas drainage process. During the hole-sealing process after the drilling is completed, the compression-resistant perforated pipe is pushed between the drilled coal seams, and the expansion valve assembly is opened by pulling the rope, so that the wire mesh outside the compression-resistant perforated pipe reaches the expanded state, avoiding the contact between the coal seam and the perforated pipe body; the gas permeates through the wire mesh and floats on the outer wall of the perforated pipe body, enters the inside of the perforated pipe body through the perforations, and finally converges into the drainage pipe. Six spring pieces support the wire mesh by their own elastic force and are supported and positioned by the positioning valve, forming a breathable structure with an ellipsoidal outer package to fully separate the perforated pipe body from the coal seam, effectively preventing both the coal seam pressure and the coal seam shedding, and ensuring the normal progress of gas drainage.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: A self-expanding hole-protecting and compression-resistant perforated pipe for gas drainage includes a perforated pipe body uniformly provided with a plurality of perforations. An annular fixed socket is fixedly provided on the outer circle of the left end of the perforated pipe body, and an annular movable socket is slidably provided on the outer circle of the right end of the perforated pipe body. A expandable breathable support structure covering the perforations is provided between the annular fixed socket and the annular movable socket. An expansion valve assembly for positioning the axial extension or radial expansion position of the annular movable socket is provided inside the right end of the perforated pipe body. The expansion valve assembly is connected with a rope for driving the expansion valve assembly to be positioned and matched with the annular movable socket, and the rope extends leftward along the inside of the perforated pipe body out of the borehole.

[0005] The annular fixed connector includes an internal thread sleeve threadedly connected to the outer circumference of the flower tube body. An annular left card slot with an open right side is provided inside the internal thread sleeve. On the internal thread sleeve, a left positioning snap ring with an L-shaped cross-section is fixedly provided on the outer side wall of the right port of the left annular card slot. There is a left accommodation cavity between the left end of the left positioning snap ring and the left bottom of the left annular card slot. The left positioning snap ring and the inner side wall of the left annular card slot form a left insertion channel. The left end of the left positioning snap ring is provided with a left limiting convex ring protruding into the left insertion channel, and the distance between the left limiting convex ring and the inner side wall of the left annular card slot gradually increases from left to right.

[0006] The annular movable connector includes a sliding sleeve slidably connected to the outer circumference of the flower tube body. A left positioning ring groove and a right positioning ring groove are respectively provided on the left and right sides of the inner circumference of the sliding sleeve. A left guiding tapered opening is provided on the left side of the inner circumference of the sliding sleeve, and a right guiding tapered opening is provided on the right side of the inner circumference of the sliding sleeve in the right positioning ring groove.

[0007] An annular right card slot with an open left side is provided inside the sliding sleeve. On the sliding sleeve, a right positioning snap ring with an L-shaped cross-section is fixedly provided on the outer side wall of the left port of the right annular card slot. There is a right accommodation cavity between the right end of the right positioning snap ring and the right bottom of the right annular card slot. The right positioning snap ring and the inner side wall of the right annular card slot form a right insertion channel. The left end of the left positioning snap ring is provided with a right limiting convex ring protruding into the right insertion channel, and the distance between the right limiting convex ring and the inner side wall of the right annular card slot gradually decreases from left to right.

[0008] The telescopic valve assembly includes a fixed sleeve, a connecting plate, a first connecting rod, a second connecting rod, a compression spring, a left positioning pin, and a right positioning pin.

[0009] The outer diameter of the fixed sleeve is equal to the inner diameter of the flower tube body. The fixed sleeve is fixedly installed inside the right end of the flower tube body coaxially. A right guiding hole that is open inside and outside is provided in the radial direction at the corresponding connection between the outer circumferences of the flower tube body and the fixed sleeve. A left guiding hole is provided on the left side of the fixed sleeve on the flower tube body. The central connection line of the left guiding hole and the right guiding hole, the length direction of the connecting plate, and the center line of the flower tube body are parallel. The left positioning pin is inserted into the left guiding hole, and the right positioning pin is inserted into the right guiding hole. The outer ends of the left positioning pin and the right positioning pin are both spherical structures. The outer end of the left positioning pin can be inserted into the left positioning ring groove, and the outer end of the right positioning pin can be inserted into the right positioning ring groove. The inner ends of the left positioning pin and the right positioning pin are respectively fixedly connected to the left end and the right end of the connecting plate. The outer end of the first connecting rod is hinged to the inner side surface of the connecting plate inside the fixed sleeve through a first hinge. The outer end of the second connecting rod is hinged to the inner wall of the fixed sleeve through a second hinge. The connection line of the first hinge and the second hinge coincides with the center line of the right positioning pin. The two ends of the compression spring are respectively connected to the first hinge and the second hinge. The inner ends of the first connecting rod and the second connecting rod are connected through a pin shaft. One end of the rope is connected to the pin shaft.

[0010] The inflatable breathable support structure includes a cylindrical wire mesh cloth and several spring pieces evenly arranged along the circumferential direction of the flower tube body. Each spring piece is an arc-shaped strip structure, and the length direction of each spring piece is arranged along the left-right direction. The left end of the spring piece is provided with a left barbed plug, and the left barbed plug extends into the left receiving cavity along the left insertion channel and is clamped and matched with the left positioning snap ring. The right end of the spring piece is provided with a right barbed plug, and the right barbed plug extends into the right receiving cavity along the right insertion channel and is clamped and matched with the right positioning snap ring. The cylindrical wire mesh cloth is wrapped outside several spring pieces between the annular fixed connector and the annular movable connector.

[0011] On the front and rear sides of the inner side wall of the left insertion channel, there are left limiting convex structures in contact with the left positioning snap ring, and on the front and rear sides of the inner side wall of the right insertion channel, there are right limiting convex structures in contact with the right positioning snap ring.

[0012] With the above technical solution, when the present invention is in use, first, the inner sleeve of the annular fixed connector is threadedly connected to the outer circle of the left end of the flower tube body. Then, the left barbed plug at the left end of the spring piece passes through the left insertion channel and extends into the left receiving cavity to be clamped and matched with the left positioning snap ring. Then, the annular movable connector is slidably installed on the outer circle of the right end of the flower tube body. Then, the expansion valve assembly is installed inside the right end of the flower tube body. At the same time, the outer end of the left positioning pin is inserted into the left positioning ring groove to position the annular movable connector. Then, the right barbed plug at the right end of the spring piece passes through the right insertion channel and extends into the right receiving cavity to be clamped and matched with the right positioning snap ring. At this time, the spring piece is slightly stretched, that is, the spring piece is subjected to a force of being stretched to the right. Then, pull the rope to the left, and the rope drives the pin shaft to move to the left. The included angle between the first connecting rod and the second connecting rod becomes smaller, overcoming the elastic force of the compression spring. The outer end of the first connecting rod pulls the first hinge to move towards the center of the fixed sleeve, thereby driving the connecting plate, the left positioning pin, and the right positioning pin to retract into the flower tube body. Then, overcoming the elastic force of the spring piece itself, drive the annular movable connector to move to the right along the outer circle of the flower tube body until the right positioning ring groove moves to correspond to the right positioning pin. Release the rope, and under the action of the compression spring, drive the connecting plate, the left positioning pin, and the right positioning pin to move outwards. The outer end of the right positioning pin extends into the right positioning ring groove to position the annular movable connector. At this time, the spring piece is stretched to be basically parallel to the flower tube body. Then, the cylindrical wire mesh cloth is sleeved outside several spring pieces between the annular fixed connector and the annular movable connector.

[0013] After the various components of the present invention are installed into the pressure-resistant flower tube, the left end of the pressure-resistant flower tube is connected to the right end of the extraction tube, and the rope also passes through the extraction tube to the left, and the extraction tube and the pressure-resistant flower tube are inserted into the drill hole. The flower tube stops after it is inserted into the set depth, and the annular cavity between the outer circle of the extraction tube and the inner wall of the drill hole is sealed. The outer end of the left locating pin blocks the right side of the left locating ring groove. At this time, the rope is completely released, and under the action of the compression spring, the connecting plate, the left locating pin and the right locating pin are driven to move outward, and the outer end of the left locating pin further extends into the left locating ring groove to position the annular movable connector; the spring sheet stretches the wire mesh to form an ellipsoid. Finally, connect the extraction pipe to the gas extraction pipeline in the underground tunnel.

[0014] The present invention has the following technical effects:

[0015] 1. By using the elastic deformation characteristics of the spring sheet, after the hole is sealed, the two positioning pins of the telescopic valve assembly are contracted by pulling the rope to release the force constraining the spring sheet and restore the spring sheet to its original arc shape. The restored spring sheet props up the wire mesh cloth and then protects the surrounding of the flower tube body, which in disguise increases the contact area between the flower tube body and the coal body, increases the gas flow, and is conducive to the transformation of adsorbed gas into free gas.

[0016] 2. The outer periphery of the flower tube body is supported by several (six) arc-shaped spring sheets. The spring sheets are naturally bent. According to the mechanical characteristics and arrangement characteristics of the spring sheets, they have a certain compressive strength. Even if the coal seam collapses, they can still support the normal extraction of the flower tube body. A layer of wire mesh is set around the spring sheet to effectively block the coal slag outside the flower tube body; in this way, the probability of encountering blockage of the flower tube body is reduced. Effectively solve the problem of gas extraction blockage.

[0017] 3. The left and right ends of the spring sheet are respectively inserted and connected with the annular fixed connector and the annular movable connector, which is convenient for installation. In particular, the right limit protrusion structure in contact with the right positioning clamp ring is set on the front and rear sides of the inner wall of the right plug-in channel, which effectively fixes the position of the spring sheet and prevents radial expansion failure caused by the disorder of the spring sheet position. When one of the spring sheets is stressed, the remaining spring sheets can share part of the force for support, effectively resolving the problem of extraction difficulties caused by uneven expansion due to uneven stress.

[0018] 4. Both the annular fixed connector and the annular movable connector are used to fix the arrangement position of the spring pieces around the flower tube body, presenting a regular shape, and providing a supporting force for the spring pieces with recovery type deformation to resist pressure; the annular fixed connector determines the position of the left end of the spring piece, and the annular movable connector is used to cooperate and engage with the right positioning pin of the expansion valve assembly when pulling the spring piece flat to the right. When the right positioning pin of the expansion valve assembly disengages from the right positioning ring groove, with the elastic force of the spring piece itself, the deformation is restored, and then the left positioning pin of the expansion valve assembly is inserted into the right positioning ring groove to position the annular movable connector.

[0019] In summary, the present invention mainly solves the problem that during the gas drainage in soft coal seams, due to the softness of the coal seams, the collapse of the coal seams causes the blockage of the flower tube, resulting in the reduction of the drainage efficiency and the waste of resources. Through the elastic deformation of the spring pieces, the wire mesh cloth expands to create an expanded space inside the drill hole to protect the flower tube and solve the problem of flower tube blockage; at the same time, the contact area between the flower tube and the coal is increased, which is conducive to the gas drainage. The problem of borehole blockage caused by the contact between the flower tube and the coal seam is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present invention before extending into the drill hole;

[0021] Figure 2 is a schematic structural view of the present invention with radial expansion when extending into the drill hole;

[0022] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0023] Figure 4 is Figure 1 the enlarged view of the annular fixed connector in

[0024] Figure 5 is Figure 4 the right view of

[0025] Figure 6 is Figure 1 the enlarged view of the annular movable connector in

[0026] Figure 7 is Figure 6 the left view of

[0027] Figure 8 is Figure 1 the enlarged view of the expansion valve assembly in DETAILED DESCRIPTION OF THE INVENTION

[0028] As Figure 1-8As shown in the figure, the self-expanding hole-protecting and compression-resistant perforated pipe for gas drainage of the present invention includes a perforated pipe body 1 uniformly provided with a plurality of perforations 4. An annular fixed socket 2 is fixedly arranged on the outer circumference of the left end of the perforated pipe body 1. An annular movable socket 3 is slidably arranged on the outer circumference of the right end of the perforated pipe body 1. A expandable and breathable support structure covering the perforations 4 is arranged between the annular fixed socket 2 and the annular movable socket 3. Inside the right end of the perforated pipe body 1, a telescopic valve assembly 6 for positioning the axial extension or radial expansion position of the annular movable socket 3 is provided. The telescopic valve assembly 6 is connected with a rope 5 for driving the telescopic valve assembly 6 to be in positioning cooperation with the positioning of the annular movable socket 3. The rope 5 extends leftward along the inside of the perforated pipe body 1 out of the drill hole.

[0029] The annular fixed socket 2 includes an internal thread sleeve 38 threadedly connected to the outer circumference of the perforated pipe body 1. A left annular clamping groove 7 with an open right side is formed inside the internal thread sleeve 38. On the outer side wall of the right port of the left annular clamping groove 7 on the internal thread sleeve 38, a left positioning clamping ring 8 with an L-shaped cross-section is fixedly arranged. There is a left accommodating cavity 9 between the left end of the left positioning clamping ring 8 and the left groove bottom of the left annular clamping groove 7. A left insertion channel 10 is formed between the left positioning clamping ring 8 and the inner side wall of the left annular clamping groove 7. A left limiting convex ring 11 protruding into the left insertion channel 10 is arranged at the left end of the left positioning clamping ring 8. The distance between the left limiting convex ring 11 and the inner side wall of the left annular clamping groove 7 gradually increases from left to right.

[0030] The annular movable socket 3 includes a sliding sleeve 12 slidably connected to the outer circumference of the perforated pipe body 1. A left positioning ring groove 13 and a right positioning ring groove 14 are respectively formed on the left side and the right side of the inner circumference of the sliding sleeve 12. A left guiding tapered opening 15 is arranged on the left side of the inner circumference of the sliding sleeve 12 in the left positioning ring groove 13. A right guiding tapered opening 16 is arranged on the right side of the inner circumference of the sliding sleeve 12 in the right positioning ring groove 14.

[0031] A right annular clamping groove 17 with an open left side is formed inside the sliding sleeve 12. On the outer side wall of the left port of the right annular clamping groove 17 on the sliding sleeve 12, a right positioning clamping ring 18 with an L-shaped cross-section is fixedly arranged. There is a right accommodating cavity 19 between the right end of the right positioning clamping ring 18 and the right groove bottom of the right annular clamping groove 17. A right insertion channel 20 is formed between the right positioning clamping ring 18 and the inner side wall of the right annular clamping groove 17. A right limiting convex ring 21 protruding into the right insertion channel 20 is arranged at the left end of the left positioning clamping ring 8. The distance between the right limiting convex ring 21 and the inner side wall of the right annular clamping groove 17 gradually decreases from left to right.

[0032] The telescopic valve assembly 6 includes a fixed sleeve 22, a connecting plate 23, a first connecting rod 24, a second connecting rod 25, a compression spring 26, a left positioning pin 27 and a right positioning pin 28.

[0033] The outer diameter of the fixed sleeve 22 is equal to the inner diameter of the flower tube body 1. The fixed sleeve 22 is fixedly installed inside the right end of the flower tube body 1 along the central axis. A right guide hole that penetrates through from the inside to the outside is provided in the radial direction at the corresponding connection of the outer circles of the flower tube body 1 and the fixed sleeve 22. A left guide hole is provided on the flower tube body 1 on the left side of the fixed sleeve 22. The central connection line of the left guide hole and the right guide hole, the length direction of the connecting plate 23, and the central axis of the flower tube body 1 are arranged in parallel. The left positioning pin 27 is inserted into the left guide hole, and the right positioning pin 28 is inserted into the right guide hole. The outer ends of the left positioning pin 27 and the right positioning pin 28 are both spherical head structures. The outer end of the left positioning pin 27 can be inserted into the left positioning ring groove 13, and the outer end of the right positioning pin 28 can be inserted into the right positioning ring groove 14. The inner ends of the left positioning pin 27 and the right positioning pin 28 are respectively fixedly connected to the left end and the right end of the connecting plate 23. The outer end of the first connecting rod 24 is hinged to the inner side surface of the connecting plate 23 inside the fixed sleeve 22 through the first hinge 29. The outer end of the second connecting rod 25 is hinged to the inner wall of the fixed sleeve 22 through the second hinge 30. The connection line of the first hinge 29 and the second hinge 30 coincides with the central axis of the right positioning pin 28. The two ends of the compression spring 26 are respectively connected to the first hinge 29 and the second hinge 30. The inner ends of the first connecting rod 24 and the second connecting rod 25 are connected through the pin shaft 31. One end of the rope 5 is connected to the pin shaft 31.

[0034] The expandable breathable support structure includes a cylindrical wire mesh cloth 35 and six spring pieces 32 evenly arranged along the circumferential direction of the flower tube body 1. Each spring piece 32 is an arc-shaped strip structure. The length direction of each spring piece 32 is arranged along the left-right direction. The left end of the spring piece 32 is provided with a left barbed plug 33. The left barbed plug 33 extends into the left accommodation cavity 9 along the left insertion channel 10 and is clamped and matched with the left positioning snap ring 8. The right end of the spring piece 32 is provided with a right barbed plug 34. The right barbed plug 34 extends into the right accommodation cavity 19 along the right insertion channel 20 and is clamped and matched with the right positioning snap ring 18. The cylindrical wire mesh cloth 35 is wrapped outside several spring pieces 32 between the annular fixed plug connector 2 and the annular movable plug connector 3.

[0035] On the front and rear sides of the inner side wall of the left insertion channel 10, there are left limiting convex structures 36 that contact the left positioning snap ring 8. On the front and rear sides of the inner side wall of the right insertion channel 20, there are right limiting convex structures 37 that contact the right positioning snap ring 18.

[0036] When the present invention is in use, first, the inner sleeve of the annular fixed connector 2 is threadedly connected to the outer circle of the left end of the flower tube body 1. Then, the left barb plug 33 at the left end of the spring piece 32 passes through the left insertion channel 10 and extends into the left receiving cavity 9 to be snap-fitted with the left positioning snap ring 8. Next, the annular movable connector 3 is slidably mounted on the outer circle of the right end of the flower tube body 1. Then, the expansion valve assembly 6 is installed inside the right end of the flower tube body 1. At the same time, the outer end of the left positioning pin 27 is inserted into the left positioning ring groove 13 to position the annular movable connector 3. Then, the right barb plug 34 at the right end of the spring piece 32 passes through the right insertion channel 20 and extends into the right receiving cavity 19 to be snap-fitted with the right positioning snap ring 18. At this time, the spring piece 32 is slightly stretched, that is, the spring piece 32 is subjected to a force of being stretched to the right. Then, pull the rope 5 to the left. The rope 5 drives the pin shaft 31 to move to the left. The included angle between the first connecting rod 24 and the second connecting rod 25 becomes smaller, overcoming the elastic force of the compression spring 26. The outer end of the first connecting rod 24 pulls the first hinge 29 to move towards the center of the fixed sleeve 22, thereby driving the connecting plate 23, the left positioning pin 27 and the right positioning pin 28 to retract into the flower tube body 1. Then, overcoming the elastic force of the spring piece 32 itself, the annular movable connector 3 is driven to move to the right along the outer circle of the flower tube body 1 until the right positioning ring groove 14 moves to correspond to the right positioning pin 28. Release the rope 5. Under the action of the compression spring 26, the connecting plate 23, the left positioning pin 27 and the right positioning pin 28 are driven to move outwards. The outer end of the right positioning pin 28 extends into the right positioning ring groove 14 to position the annular movable connector 3. At this time, the spring piece 32 is stretched to be basically parallel to the flower tube body 1. Then, the tubular wire mesh cloth 35 is sleeved outside several spring pieces 32 between the annular fixed connector 2 and the annular movable connector 3.

[0037] After the various components of the present invention are installed into the pressure-resistant flower tube, the left end of the pressure-resistant flower tube is connected to the right end of the extraction tube, and the rope 5 also passes through the extraction tube to the left, and the extraction tube and the pressure-resistant flower tube are inserted into the drilled hole. The flower tube stops after being inserted into the set depth, and the annular cavity between the outer circle of the extraction tube and the inner wall of the drilled hole is sealed. Then the rope 5 is pulled to the left, and the rope 5 drives the pin shaft 31 to move to the left. The first connecting rod 24 and the second connecting rod 25 become smaller at an included angle, overcoming the elastic force of the compression spring 26. The outer end of the first connecting rod 24 pulls the first hinge 29 to move toward the center of the fixed sleeve 22, and then drives the connecting plate 23, the left positioning pin 27 and the right positioning pin 28 to retract into the inside of the flower tube body 1. The outer end of the right positioning pin 28 disengages from the right positioning ring groove 14. Under the action of the elastic force of the spring sheet 32 ​​itself, the spring sheet 32 ​​drives the annular movable connector 3 to move to the left. At this time, the rope 5 is slightly loosened to make the left positioning pin 27 and the right positioning pin 2 8 At the same time, the outer diameter of the flower tube body 1 is protruded outward by 3-5mm, and the left guide cone 15 on the left side of the left positioning ring groove 13 can just pass through the outer end of the left positioning pin 27. The left positioning pin 27 has been inserted into the left positioning ring groove 13, and the outer end of the left positioning pin 27 blocks the right side of the left positioning ring groove 13. At this time, the rope 5 is completely loosened. Under the action of the compression spring 26, the connecting plate 23, the left positioning pin 27 and the right positioning pin 28 are driven to move outward, and the outer end of the left positioning pin 27 is further inserted into the left positioning ring groove 13 to position the annular movable connector 3; the spring sheet 32 ​​expands the wire mesh 35 to form an ellipsoid shape. Finally, the extraction pipe is connected to the gas extraction pipeline in the underground tunnel.

[0038] This embodiment does not impose any formal limitation on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. Self-expanding hole-protecting and compression-resistant flower tube for gas drainage, comprising a flower tube body uniformly provided with a number of flower holes, Characterized in that: An annular fixed plug connector is fixedly arranged on the outer circle of the left end of the flower tube body, and an annular movable plug connector is slidably arranged on the outer circle of the right end of the flower tube body. An expandable and breathable support structure covering the flower holes is arranged between the annular fixed plug connector and the annular movable plug connector. Inside the right end of the flower tube body, a telescopic valve assembly for positioning the axial extension or radial expansion position of the annular movable plug connector is provided. The telescopic valve assembly is connected with a rope for driving the telescopic valve assembly to be in positioning cooperation with the annular movable plug connector. The rope extends leftward along the inside of the flower tube body and out of the drill hole; The expandable and breathable support structure includes a cylindrical wire mesh cloth and a number of spring pieces uniformly arranged along the circumferential direction of the flower tube body. Each spring piece is an arc-shaped strip structure, and the length direction of each spring piece is arranged along the left-right direction. The left end of the spring piece is provided with a left barbed plug, and the left barbed plug extends into the left accommodating cavity along the left insertion channel and is clamped and matched with the left positioning snap ring. The right end of the spring piece is provided with a right barbed plug, and the right barbed plug extends into the right accommodating cavity along the right insertion channel and is clamped and matched with the right positioning snap ring. The cylindrical wire mesh cloth is wrapped outside a number of spring pieces between the annular fixed plug connector and the annular movable plug connector; The telescopic valve assembly includes a fixed sleeve, a connecting plate, a first connecting rod, a second connecting rod, a compression spring, a left positioning pin and a right positioning pin.

2. The self-expanding hole-protecting and compression-resistant flower tube for gas drainage according to claim 1, Characterized in that: The annular fixed plug connector includes an internal thread sleeve threadedly connected to the outer circle of the flower tube body. The inside of the internal thread sleeve is provided with a left annular card slot with an open right side. On the outer side wall of the right port of the left annular card slot on the internal thread sleeve, a left positioning snap ring with an L-shaped cross section is fixedly arranged. There is a left accommodating cavity between the left end of the left positioning snap ring and the left groove bottom of the left annular card slot. The left positioning snap ring and the inner side wall of the left annular card slot form a left insertion channel. The left end of the left positioning snap ring is provided with a left limiting convex ring protruding into the left insertion channel, and the distance between the left limiting convex ring and the inner side wall of the left annular card slot gradually increases from left to right.

3. The self-expanding hole-protecting and compression-resistant flower tube for gas drainage according to claim 2, Characterized in that: The annular movable plug connector includes a sliding sleeve slidably connected to the outer circle of the flower tube body. The left side and the right side of the inner circle of the sliding sleeve are respectively provided with a left positioning ring groove and a right positioning ring groove. The left inner circle of the sliding sleeve is provided with a left guiding taper at the left side of the left positioning ring groove, and the right inner circle of the sliding sleeve is provided with a right guiding taper at the right side of the right positioning ring groove; The inside of the sliding sleeve is provided with a right annular card slot with an open left side. On the outer side wall of the left port of the right annular card slot on the sliding sleeve, a right positioning snap ring with an L-shaped cross section is fixedly arranged. There is a right accommodating cavity between the right end of the right positioning snap ring and the right groove bottom of the right annular card slot. The right positioning snap ring and the inner side wall of the right annular card slot form a right insertion channel. The left end of the left positioning snap ring is provided with a right limiting convex ring protruding into the right insertion channel, and the distance between the right limiting convex ring and the inner side wall of the right annular card slot gradually decreases from left to right.

4. The self-expanding hole-protecting and compression-resistant flower tube for gas drainage according to claim 3, Characterized in that: The outer diameter of the fixed sleeve is equal to the inner diameter of the flower tube body. The fixed sleeve is fixedly installed inside the right end of the flower tube body coaxially. A right guide hole that penetrates through the inside and outside is provided in the radial direction at the corresponding connection of the outer circles of the flower tube body and the fixed sleeve. A left guide hole is provided on the flower tube body to the left of the fixed sleeve. The central connection line of the left guide hole and the right guide hole, the length direction of the connecting plate, and the central line of the flower tube body are arranged in parallel. The left positioning pin is inserted into the left guide hole, and the right positioning pin is inserted into the right guide hole. The outer ends of the left positioning pin and the right positioning pin are both spherical head structures. The outer end of the left positioning pin can be inserted into the left positioning ring groove, and the outer end of the right positioning pin can be inserted into the right positioning ring groove. The inner ends of the left positioning pin and the right positioning pin are respectively fixedly connected to the left end and the right end of the connecting plate. The outer end of the first connecting rod is hinged to the inner side surface of the connecting plate inside the fixed sleeve through the first hinge. The outer end of the second connecting rod is hinged to the inner wall of the fixed sleeve through the second hinge. The connection line of the first hinge and the second hinge coincides with the central line of the right positioning pin. The two ends of the compression spring are respectively connected to the first hinge and the second hinge. The inner ends of the first connecting rod and the second connecting rod are connected by a pin shaft. One end of the rope is connected to the pin shaft.

5. The self-expanding hole protection and compression-resistant flower tube for gas drainage according to claim 3, characterized in that: On the front and rear sides of the inner side wall of the left insertion channel, there are left limiting convex structures that contact the left positioning snap ring. On the front and rear sides of the inner side wall of the right insertion channel, there are right limiting convex structures that contact the right positioning snap ring.

Images