Underground plugging device for blasting permeation enhancement of low-permeability sandstone uranium ore

Abstract

The invention provides an underground plugging device for blasting and permeation enhancement of a low-permeability sandstone uranium mine, and belongs to the technical field of mining, the underground plugging device for blasting and permeation enhancement of the low-permeability sandstone uranium mine comprises a lifting device, a plugging cylinder, a pusher, an elastic piece, an abutting block, a pressure sensor and a plugging assembly, and the plugging cylinder is connected with the lifting device; the pusher is connected to the plugging barrel in a sliding mode in the vertical direction, and the pusher comprises a stress disc extending out of the bottom of the plugging barrel and a driving disc located in the plugging barrel; the elastic piece is arranged in the plugging cylinder, and the elastic piece abuts against the top face of the driving disc; the abutting block is movably connected to the plugging barrel, and the abutting block abuts against the driving disc; the pressure sensor is arranged at the end, away from the driving disc, of the elastic piece. The plugging assembly comprises an inflation and deflation mechanism in communication connection with the pressure sensor and an air bag arranged on the periphery of the plugging barrel.

Description

Technical Field

[0001] The invention belongs to the technical field of mining, and in particular relates to an underground plugging device used for blasting and permeability enhancement of low-permeability sandstone uranium mines. Background Art

[0002] Natural uranium is an important nuclear power fuel. The current method of natural uranium mining is in-situ leaching. The permeability of the reservoir can be effectively improved through physical methods such as hydraulic fracturing technology, perforation technology, high-energy gas fracturing technology, and chemical technologies such as acidification. The existing deep hole blasting mainly involves filling the top of the explosive with materials such as gun mud after the explosive is placed in the deep hole. However, the sealing of this method is poor, resulting in unsatisfactory blasting permeability enhancement effect. Summary of the invention

[0003] The embodiment of the present invention provides an underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium mines, aiming to solve the technical problem that the existing deep hole blasting uses materials such as gun mud to seal the explosives, which has poor sealing performance and leads to unsatisfactory blasting permeability enhancement effect.

[0004] To achieve the above object, the technical solution adopted by the present invention is to provide an underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium mines, comprising: A lifting device, used to be located at the wellhead; A plugging cylinder connected to the lifting device; A pusher is slidably connected to the blocking cylinder in an up-down direction, and the pusher includes a force-bearing disk extending out from the bottom of the blocking cylinder and a driving disk located in the blocking cylinder; An elastic member, disposed in the blocking cylinder, the elastic member abutting against the top surface of the driving disk; An abutment block, movably connected to the blocking cylinder, the abutment block abuts against the driving disk; A pressure sensor is arranged at one end of the elastic member away from the driving disk; A plugging assembly, comprising an inflation and deflation mechanism communicatively connected to the pressure sensor and an air bag arranged on the outer periphery of the plugging tube, wherein the inflation and deflation mechanism is used to inflate and deflate the air bag; Among them, the driving disk is used to overcome the elastic force of the elastic member and push the abutment block so that the abutment block rotates to open and protrude from the outer circumferential surface of the sealing tube. The pressure sensor is used to detect the pressure at the top of the elastic member. When the pressure value reaches a preset value, the inflation and deflation mechanism inflates the airbag so that the airbag abuts against the well wall.

[0005] In a possible implementation, the elastic member includes: A fixed cylinder is fixedly connected to the bottom of the pressure sensor, and a cavity is provided in the fixed cylinder and passes through the fixed cylinder from top to bottom; A spring, disposed in the fixing cylinder; A trigger block is slidably connected to the cavity, and the trigger block contacts the bottom end of the spring.

[0006] In a possible implementation, a first limiting ring is provided at the bottom end of the fixed cylinder, and a second limiting ring is provided at the top end of the trigger block. The second limiting ring is located above the first limiting ring, and the outer diameter of the second limiting ring is greater than the inner diameter of the first limiting ring.

[0007] In a possible implementation, a plurality of the airbags are spaced apart along the axial direction of the blocking cylinder.

[0008] In a possible implementation, a through hole is provided on the bottom surface of the blocking cylinder, and the pusher further includes: A connecting rod connected between the force-bearing disk and the driving disk, wherein the connecting rod is slidably matched with the through hole; A limiting plate is arranged on the connecting rod, the limiting plate is located between the force-bearing plate and the driving plate, and is located in the blocking cylinder, and the outer diameter of the limiting plate is greater than the diameter of the through hole.

[0009] In a possible implementation, a plurality of installation windows are evenly arranged on the outer circumference of the sealing cylinder, the top end of the abutment block is rotatably connected to the sealing cylinder via a rotating shaft, the rotating shaft is perpendicular to the axial direction of the sealing cylinder, the outer circumferential surface of the driving disk is a conical surface, and the diameter gradually decreases from bottom to top, and the inner circumference of the abutment block is provided with an arc surface adapted to the conical surface.

[0010] In a possible implementation, the rotating shaft includes a main threaded rod and a secondary threaded rod connected at both ends of the main threaded rod, the secondary threaded rod is a hollow rod, the main threaded rod is a solid rod, the secondary threaded rod is fixed on the sealing cylinder, and the main threaded rod passes through the abutment block and rotates with the abutment block.

[0011] In a possible implementation, the lifting device includes: A support, arranged at the wellhead; A rotating roller, rotatably connected to the bracket; A lifting rope is wound around the rotating roller, and a free end of the lifting rope is connected to the blocking cylinder; The motor has an output shaft which is fixedly connected to the rotating roller.

[0012] In a possible implementation, a lifting ring is provided on the top of the plugging cylinder, and a lifting hook connected to the lifting ring is provided on the free end of the lifting rope.

[0013] In a possible implementation, the method further includes: A ground controller is connected to the motor and the pressure sensor for controlling the lowering depth of the plugging tube, detecting the pressure value during blasting, and controlling the detonation of explosives.

[0014] Compared with the prior art, the scheme shown in the embodiment of the present application is that the underground plugging device in the embodiment of the present application can use the impact force of the explosives to realize the automatic opening of the abutment block and the airbag when the explosives explode, thereby automatically forming a blockage. The abutment block is stuck on the inner wall of the well, which can prevent the plugging tube from rushing out of the wellhead, thereby improving safety; the lifting device can facilitate the arrangement of the plugging tube in the well and the recovery of the plugging tube after use, thereby reducing the cost of use; the airbag and the abutment block can be fully opened when the explosion occurs to realize underground plugging, and the plugging effect is better, which is beneficial to the blasting and permeability enhancement effect of uranium ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the use structure of an underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore provided by an embodiment of the present invention; Figure 2 A schematic diagram of the cross-sectional structure of a plugging cylinder used in an embodiment of the present invention; Figure 3 A schematic diagram of a blocking tube in use (a state where both the abutment block and the airbag are opened) used in an embodiment of the present invention; Figure 4 A schematic cross-sectional structure diagram of a plugging cylinder used in another embodiment of the present invention; Figure 5 A schematic diagram of the matching structure of the rotating shaft and the abutment block used in an embodiment of the present invention.

[0016] Description of reference numerals: 10-lifting device; 11-bracket; 12-rotating roller; 13-lifting rope; 14-motor; 15-hook; 20-blocking cylinder; 21-installation window; 22-rotating shaft; 221-main threaded rod; 222-secondary threaded rod; 23-lifting ring; 30-thruster; 31-force plate; 32-driving plate; 33-connecting rod; 34-limiting plate; 40-elastic member; 41-fixing cylinder; 411-first limiting ring; 42-spring; 43-trigger block; 431-second limiting ring; 50- abutment block; 60-pressure sensor; 70-blocking assembly; 71-inflating and deflation mechanism; 72-airbag; 80 - Ground controls. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0019] Unless otherwise expressly defined, the directional words in the claims, specification and the above-mentioned drawings of the present invention, such as the use of terms such as "upper", "lower", "top", "bottom", "front", "back", "inside", "outside", "center", "lateral", "longitudinal", "horizontal", "vertical", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0020] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0021] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0022] Please also read Figures 1 to 5The downhole plugging device for blasting and permeability enhancement of low-permeability sandstone uranium mines provided by the present invention is now described. The downhole plugging device for blasting and permeability enhancement of low-permeability sandstone uranium mines comprises a lifting device 10, a plugging tube 20, a pusher 30, an elastic member 40, an abutment block 50, a pressure sensor 60 and a plugging assembly 70. The lifting device 10 is used to be arranged at the wellhead; the plugging tube 20 is connected to the lifting device 10; the pusher 30 is connected to the plugging tube 20 in a sliding manner in the up-down direction, and the pusher 30 comprises a force plate 31 extending from the bottom of the plugging tube 20, and a pressure sensor 60 located inside the plugging tube 20. The driving disk 32; the elastic member 40 is arranged in the blocking tube 20, and the elastic member 40 abuts against the top surface of the driving disk 32; the abutment block 50 is movably connected to the blocking tube 20, and the abutment block 50 abuts against the driving disk 32; the pressure sensor 60 is arranged at one end of the elastic member 40 away from the driving disk 32; the blocking assembly 70 includes an inflation and deflation mechanism 71 that is communicatively connected to the pressure sensor 60 and an air bag 72 arranged on the outer periphery of the blocking tube 20, and the inflation and deflation mechanism 71 is used to inflate and deflate the air bag 72; Among them, the driving disk 32 is used to overcome the elastic force of the elastic member 40 to push the abutment block 50, so that the abutment block 50 rotates to open the outer peripheral surface of the protruding sealing tube 20, and the pressure sensor 60 is used to detect the pressure at the top of the elastic member 40. When the pressure value reaches a preset value, the inflation and deflation mechanism 71 inflates the airbag 72 so that the airbag 72 abuts against the well wall.

[0023] The underground plugging device provided in this embodiment for blasting permeability enhancement of low-permeability sandstone uranium ore has the following specific use process: First, explosives for blasting are arranged underground, and then the sealing tube 20 is placed into the preset depth underground by the lifting device 10. After the explosives are operated to explode, the impact force of the blasting will push the force disk 31, and the force disk 31 drives the driving disk 32 to move upward. When the blasting force is small, the elastic force of the elastic member 40 is not overcome, and the abutment block 50 and the airbag 72 will not open at this time. When the blasting force is large, the driving disk 32 will overcome the elastic force of the elastic member 40 and push the abutment block 50 to open. At this time, the pressure value detected by the pressure sensor 60 also exceeds the preset value, so that the airbag 72 is also opened at the same time. After opening, the abutment block 50 will abut against the inner wall of the well, and the airbag 72 will also abut against the inner wall of the well to achieve short-term blocking. Then the airbag 72 is deflated, and the sealing tube 20 can be lifted out by the lifting device 10, and the airbag 72 and the abutment block 50 can be replaced and used again.

[0024] Compared with the prior art, the underground plugging device of the embodiment of the present application can use the impact force of the explosives to automatically open the abutment block 50 and the airbag 72 when the explosives explode, thereby automatically forming a plug. The abutment block 50 is stuck on the inner wall of the well, which can prevent the plugging tube 10 from rushing out of the wellhead, thereby improving safety; the lifting device 10 can be used to conveniently arrange the plugging tube 20 in the well and recycle the plugging tube 20 after use, thereby reducing the cost of use; the airbag 72 and the abutment block 50 can be fully opened when the explosion occurs to achieve underground plugging, and the plugging effect is better, which is beneficial to the blasting and permeability enhancement effect of uranium ore.

[0025] In some embodiments, a specific implementation of the elastic member 40 may be as follows: Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4 The elastic member 40 includes a fixed cylinder 41, a spring 42 and a trigger block 43. The fixed cylinder 41 is fixedly connected to the bottom of the pressure sensor 60, and a cavity is provided in the fixed cylinder 41 which passes through the fixed cylinder 41 from top to bottom. The spring 42 is provided in the fixed cylinder 41. The trigger block 43 is slidably connected to the cavity, and the trigger block 43 contacts the bottom end of the spring 42. After the spring 42 is placed in the cavity in the fixed cylinder 41, it can provide guidance for the expansion and contraction process of the spring 42, so that the spring 42 will not bend when being squeezed, ensuring that the value transmitted to the pressure sensor 60 is more accurate; similarly, the cavity also provides guidance for the sliding process of the trigger block 43, ensuring that the extrusion effect of the trigger block 43 on the spring 42 is more uniform, and the extrusion force applied to the spring 42 is more concentrated, further increasing the accuracy of the numerical measurement of the pressure sensor 60, thereby ensuring the opening of the airbag 72.

[0026] In some embodiments, an improved implementation of the elastic member 40 may be as follows: Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4 , a first limiting ring 411 is provided at the bottom end of the fixed cylinder 41, and a second limiting ring 431 is provided at the top end of the trigger block 43. The second limiting ring 431 is located above the first limiting ring 411, and the outer diameter of the second limiting ring 431 is greater than the inner diameter of the first limiting ring 411. In the initial state, the spring 42 pushes the trigger block 43 so that the second limiting ring 431 abuts against the top surface of the first limiting ring 411. When the blasting force is large, the driving disk 32 overcomes the elastic force of the spring 42 to make the trigger block 43 slide upward, and the first limiting ring 411 moves in the cavity with the trigger block 43 and then squeezes the elastic member 40. At this time, the pressure value measured by the pressure sensor 60 increases; by setting the first limiting ring 411 and the second limiting ring 431, the matching state of the trigger block 43 and the cavity can be guaranteed to prevent the trigger block 43 from falling out of the cavity and affecting the triggering of the airbag 72.

[0027] In some embodiments, an improved implementation of the above-mentioned plugging assembly 70 can be adopted as follows Figure 4 See the structure shown. Figure 4 , multiple airbags 72 are arranged at intervals along the axial direction of the plugging cylinder 20. According to the specific size and plugging effect of the airbag 72, multiple airbags 72 can be arranged on the plugging cylinder 20, and then when the pressure value detected by the pressure sensor 60 reaches a preset value, multiple airbags 72 can be opened at the same time, and the abutment block 50 is mainly used to abut against the inner wall of the well to limit the upward movement of the plugging cylinder 20, and the airbag 72 can achieve the airtightness of the space below the plugging cylinder 20. Multiple airbags 72 have better effect when they work at the same time, and can be set according to needs.

[0028] Specifically, when multiple airbags 72 are provided, the multiple airbags 72 may share one inflation and deflation mechanism 71, or each airbag 72 may correspond to one inflation and deflation mechanism 71. Regardless of whether one or multiple inflation and deflation mechanisms 71 are provided, they all need to be communicated with the pressure sensor 60; when one inflation and deflation mechanism 71 is provided, the inflation and deflation mechanism 71 may be connected to the multiple airbags 72 through multiple pipes respectively, and a switch valve may be provided on each pipe, and different numbers of airbags 72 may be opened by opening different numbers of switch valves; when multiple inflation and deflation mechanisms 71 are provided, different numbers of airbags 72 may be opened by opening different numbers of inflation and deflation mechanisms 71.

[0029] When multiple inflation and deflation mechanisms 71 are set, different trigger pressure values ​​can also be set for different inflation and deflation mechanisms 71. For example, when the pressure value reaches a preset value, only the bottom airbag 72 opens. As the pressure value gradually increases beyond the preset value range, the upper airbags 72 open in sequence from bottom to top. Then, according to the actual explosion situation and the actual detection value of the pressure sensor 60, different numbers of airbags 72 can be opened to achieve a blocking effect that is more in line with the actual situation.

[0030] Optionally, the inflation and deflation mechanism 71 may adopt an air pump. When the air pump inflates the airbag 72, the air above the blocking tube 20 is drawn into the airbag 72; when the air pump deflates the airbag 72, the gas can also be discharged into the space above the blocking tube 20.

[0031] In some embodiments, an improved implementation of the pusher 30 can be as follows: Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4The bottom surface of the blocking cylinder 20 is provided with a through hole, and the pusher 30 also includes a connecting rod 33 and a limiting plate 34. The connecting rod 33 is connected between the force disk 31 and the driving disk 32, and the connecting rod 33 is slidably matched with the through hole; the limiting plate 34 is arranged on the connecting rod 33, and the limiting plate 34 is located between the force disk 31 and the driving disk 32, and is located in the blocking cylinder 20, and the outer diameter of the limiting plate 34 is larger than the diameter of the through hole. It is easy to imagine that the diameters of the force disk 31 and the driving disk 32 are also larger than the diameter of the through hole. By setting the limiting plate 34, the up and down sliding stroke of the pusher 30, that is, the distance between the limiting plate 34 and the force disk 31, can limit the up and down sliding stroke of the pusher 30, so as to prevent the pusher 30 from being too large and crushing the abutment block 50 and the elastic member 40.

[0032] In some embodiments, a specific implementation of the above-mentioned plugging cylinder 20 and abutment block 50 can be as follows: Figures 1 to 4 See the structure shown. Figures 1 to 4 A plurality of mounting windows 21 are evenly arranged on the outer periphery of the blocking cylinder 20. The top end of the abutment block 50 is rotatably connected to the blocking cylinder 20 via a rotating shaft 22. The rotating shaft 22 is perpendicular to the axial direction of the blocking cylinder 20. The outer peripheral surface of the driving disk 32 is a conical surface, and the diameter gradually decreases from bottom to top. The inner periphery of the abutment block 50 is provided with an arc surface adapted to the conical surface. When the driving disk 32 moves upward, the contact position between the outer circumference of the driving disk 32 and the abutment block 50 gradually changes, and the bottom of the abutment block 50 gradually rotates toward the outside of the sealing tube 20 in coordination with the changing trend of the arc surface on the abutment block 50, thereby realizing the opening of the abutment block 50. After opening, the abutment block 50 abuts against the inner wall of the well, which can prevent the sealing tube 20 from moving upward under the impact of the blasting and limit the position of the sealing tube 20. When the sealing tube 20 falls, the friction between the inner wall of the well and the abutment block 50 can make the abutment block 50 further open, thereby preventing the sealing tube 20 from falling when the lifting device 10 falls off.

[0033] Specifically, see Figure 5 Each rotating shaft 22 includes a main threaded rod 221 and a secondary threaded rod 222 connected to both ends of the main threaded rod 221. The secondary threaded rod 222 is a hollow rod, and the main threaded rod 221 is a solid rod. The secondary threaded rod 222 is fixed on the sealing tube 20. The main threaded rod 221 passes through the abutment block 50 and rotates with the abutment block 50. After the main threaded rod 221 is connected to the two secondary threaded rods 222, the abutment block 50 can be fixed. This structure facilitates the disassembly and assembly of the abutment block 50.

[0034] As a modified embodiment, the abutment block 50 can also be slidably set on the sealing tube 20 along the horizontal direction. One end of the abutment block 50 located in the sealing tube 20 abuts against the outer peripheral surface of the driving disk 32. The outer peripheral surface of the driving disk 32 is still a conical surface. When the driving disk 32 moves upward, the abutment block 50 is pushed out of the sealing tube 20, thereby abutting against the inner wall of the well.

[0035] In some implementations, a specific implementation of the lifting device 10 can be as follows: Figure 1 See the structure shown. Figure 1 The lifting device 10 includes a bracket 11, a rotating roller 12, a lifting rope 13 and a motor 14. The bracket 11 is arranged at the wellhead; the rotating roller 12 is rotatably connected to the bracket 11; the lifting rope 13 is wound around the rotating roller 12, and the free end of the lifting rope 13 is connected to the plugging cylinder 20; the output shaft of the motor 14 is fixedly connected to the rotating roller 12. By turning on the motor 14 to drive the rotating roller 12 to rotate forward and reverse, the lifting rope 13 can be wound and released, and the plugging cylinder 20 can be moved up and down in the well. The operation is convenient and labor-saving, and the position control of the plugging cylinder 20 in the well is more accurate.

[0036] In some embodiments, a specific connection method between the plugging tube 20 and the lifting rope 13 can be as follows: Figure 1 See the structure shown. Figure 1 A lifting ring 23 is provided at the top of the plugging cylinder 20, and a hook 15 connected to the lifting ring 23 is provided at the free end of the lifting rope 13. The hook 15 on the lifting rope 13 is directly hooked on the lifting ring 23 of the plugging cylinder 20, which facilitates the connection between the lifting rope 13 and the plugging cylinder 20, and the structure is simple and reliable.

[0037] In some implementations, an improved implementation of the above-mentioned downhole plugging device can be adopted as follows Figure 1 See the structure shown. Figure 1 The underground plugging device also includes a ground controller 80, which is connected to the motor 14 and the pressure sensor 60. The ground controller 80 is used to control the lowering depth of the plugging tube 20, detect the pressure value during blasting, and control the detonation of explosives. The ground controller 80 can detect the pressure value during blasting, so that the use status of the abutment block 50 and the airbag 72 can be observed according to the actual pressure value, and the preset value that is more in line with the opening of the airbag 72 can be set to optimize the use effect of the airbag 72; and the lowering depth of the plugging tube 20 is controlled by the ground controller 80, and the position of the plugging tube 20 in the underground is accurately controlled in coordination with the start-up time of the motor 14, so as to ensure that the distance from the blasting point is appropriate and improve the plugging effect; and the detonation of explosives is controlled by the ground controller 80, which can be ignited when the personnel are fully evacuated, which is safer.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore, characterized in that: include: A lifting device, used to be located at the wellhead; A plugging cylinder connected to the lifting device; A pusher is slidably connected to the blocking cylinder in an up-down direction, and the pusher includes a force-bearing disk extending out from the bottom of the blocking cylinder and a driving disk located in the blocking cylinder; An elastic member, disposed in the blocking cylinder, the elastic member abutting against the top surface of the driving disk; An abutment block, movably connected to the blocking cylinder, the abutment block abuts against the driving disk; A pressure sensor is arranged at one end of the elastic member away from the driving disk; A plugging assembly, comprising an inflation and deflation mechanism communicatively connected to the pressure sensor and an air bag arranged on the outer periphery of the plugging tube, wherein the inflation and deflation mechanism is used to inflate and deflate the air bag; Among them, the driving disk is used to overcome the elastic force of the elastic member and push the abutment block so that the abutment block rotates to open and protrude from the outer circumferential surface of the sealing tube. The pressure sensor is used to detect the pressure at the top of the elastic member. When the pressure value reaches a preset value, the inflation and deflation mechanism inflates the airbag so that the airbag abuts against the well wall.

2. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 1, characterized in that: The elastic member comprises: A fixed cylinder is fixedly connected to the bottom of the pressure sensor, and a cavity is provided in the fixed cylinder and passes through the fixed cylinder from top to bottom; A spring, disposed in the fixing cylinder; A trigger block is slidably connected to the cavity, and the trigger block contacts the bottom end of the spring.

3. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 2, characterized in that: A first limiting ring is disposed at the bottom end of the fixing tube, and a second limiting ring is disposed at the top end of the trigger block. The second limiting ring is located above the first limiting ring, and an outer diameter of the second limiting ring is greater than an inner diameter of the first limiting ring.

4. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 1, characterized in that: A plurality of air bags are arranged at intervals along the axial direction of the blocking tube.

5. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 1, characterized in that: The bottom surface of the blocking cylinder is provided with a through hole, and the pusher further comprises: A connecting rod connected between the force-bearing disk and the driving disk, wherein the connecting rod is slidably matched with the through hole; A limiting plate is arranged on the connecting rod, the limiting plate is located between the force-bearing plate and the driving plate, and is located in the blocking cylinder, and the outer diameter of the limiting plate is greater than the diameter of the through hole.

6. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 1, characterized in that: A plurality of installation windows are evenly arranged on the outer circumference of the sealing cylinder, the top end of the abutment block is rotatably connected to the sealing cylinder via a rotating shaft, the rotating shaft is perpendicular to the axial direction of the sealing cylinder, the outer circumferential surface of the driving disk is a conical surface, and the diameter gradually decreases from bottom to top, and the inner circumference of the abutment block is provided with an arc surface adapted to the conical surface.

7. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 6, characterized in that: The rotating shaft includes a main threaded rod and a secondary threaded rod connected to both ends of the main threaded rod, the secondary threaded rod is a hollow rod, the main threaded rod is a solid rod, the secondary threaded rod is fixed on the sealing cylinder, and the main threaded rod passes through the abutment block and rotates with the abutment block.

8. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 1, characterized in that: The lifting device comprises: A support, arranged at the wellhead; A rotating roller, rotatably connected to the bracket; A lifting rope is wound around the rotating roller, and a free end of the lifting rope is connected to the blocking cylinder; The motor has an output shaft which is fixedly connected to the rotating roller.

9. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 8, characterized in that: A lifting ring is provided on the top of the plugging cylinder, and a lifting hook connected to the lifting ring is provided on the free end of the lifting rope.

10. The underground plugging device for blasting permeability enhancement of low-permeability sandstone uranium ore according to claim 8, characterized in that: Also includes: A ground controller is connected to the motor and the pressure sensor for controlling the lowering depth of the plugging tube, detecting the pressure value during blasting, and controlling the detonation of explosives.

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