A fixed-point hole sealing device for coal mine drilling

Abstract

The application discloses a fixed-point hole sealing device for coal mine drilling and relates to the technical field of coal mine drilling and sealing. The fixed-point hole sealing device comprises a fixed shaft, a positioning and locking device fixed on the fixed shaft, an adjusting assembly rotatably arranged at the middle part of the fixed shaft, a driving assembly rotatably arranged at one end of the positioning and locking device and connected with the adjusting assembly, a hole sealing device fixed on the positioning and locking device and rotatably connected with the adjusting assembly, and a pushing shaft controllably connected with the fixed shaft. The fixed-point hole sealing device can adaptively change the hole diameter, has the active embedded sealing capacity and is convenient to operate.

Description

Technical Field

[0001] This invention relates to the field of coal mine borehole sealing technology, and more specifically, to a fixed-point sealing device for coal mine boreholes. Background Technology

[0002] In the field of coal mine borehole sealing, traditional sealing devices generally suffer from poor adaptability, low sealing reliability, and complex operation. Due to the large differences in borehole diameter and the development of coal seam fractures, conventional sealing devices struggle to dynamically adapt to changes in borehole diameter, easily leading to media leakage (such as gas leakage or seepage) due to incomplete sealing surface contact. Furthermore, existing technologies largely rely on rigid support structures, lacking the ability to actively embed seals into borehole wall fractures, and the need to destroy the sealing structure during device recovery results in material waste and low operational efficiency. In addition, traditional sealing processes require multi-step coordinated operations and high construction precision, further limiting the stability of the sealing effect. There is an urgent need for a point-sealing device that can adapt to changes in borehole diameter, possesses active embedding sealing capabilities, and is easy to operate, to solve the technical challenges of poor dynamic adaptability, insufficient sealing reliability, and high operating costs in coal mine borehole sealing. Therefore, it is necessary to provide a point-sealing device for coal mine boreholes to address the problems mentioned in the background. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a fixed-point sealing device for coal mine drilling, comprising:

[0004] Fixed shaft;

[0005] A positioning and locking device is fixed on a fixed shaft;

[0006] The adjustment component is rotatably positioned in the middle of the fixed shaft;

[0007] The drive component is rotatably mounted at one end of the positioning and locking device and connected to the adjustment component;

[0008] The sealing device is fixed on the positioning and locking device and is rotatably connected to the adjusting component;

[0009] The push axis is controllably connected to the fixed axis.

[0010] Furthermore, as a preferred embodiment, the positioning and locking device consists of a first positioning and locking component and a second positioning and locking component symmetrically distributed about the middle of the fixed shaft. The first positioning and locking component and the second positioning and locking component are respectively fixed at both ends of the fixed shaft and have the same structure.

[0011] Furthermore, preferably, the first positioning and locking component includes:

[0012] A limiting bushing is fitted onto the end of a fixed shaft, and the limiting bushing has multiple annularly distributed sliding grooves inside.

[0013] A connector connects a fixed shaft and a limiting bushing, and the connector is offset from the slide groove;

[0014] Multiple movable locking mechanisms are arranged in a ring and are slidably connected to the sliding grooves in the limiting bushing.

[0015] Furthermore, preferably, the movable locking mechanism includes:

[0016] The adjusting component is slidably disposed in the limiting bushing and consists of an outer semi-cylinder and an inner rack.

[0017] The positioning wedge is fixed on the adjusting component, and one vertical surface is slidably connected to the end of the sealing device.

[0018] Furthermore, preferably, the adjustment component includes:

[0019] The rotating sleeve is rotatably positioned in the middle of the fixed shaft;

[0020] Two threaded shafts are symmetrically distributed about the rotating sleeve shaft and fixed at both ends of the rotating sleeve shaft. The threads of the two threaded shafts at both ends are opposite and are respectively connected to the corresponding moving locking mechanism.

[0021] Rotate the gear and fix it to the threaded shaft near the drive assembly.

[0022] Furthermore, preferably, the driving component includes:

[0023] The drive shaft is rotatably mounted within the second positioning and locking assembly, with one end of its outer side connected to an external control shaft;

[0024] The drive gear is fixedly connected to the drive shaft and meshes with the rotating gear.

[0025] Furthermore, preferably, the sealing device includes:

[0026] Two limiting ring surfaces are symmetrically distributed and rotatably connected to the rotating sleeve shaft, and slidably mounted on the rotating sleeve shaft. The outer side is slidably connected to the corresponding moving locking mechanism.

[0027] The adjusting springs are arranged in a ring, with each end locked inside the limiting ring surface.

[0028] A rubber ring is fitted on the outside of the adjusting spring, with both ends fixedly connected to the limiting ring, and an array of protrusions is provided on the outer surface of the rubber ring.

[0029] Furthermore, as a preferred embodiment, both the fixed shaft and the drive shaft are provided with a connecting groove at one end near the outside of the borehole. The fixed shaft is controllably connected to the push shaft through the connecting groove, and the drive shaft is controllably connected to an external control shaft through the connecting groove.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] In this invention, the symmetrical dual-component design of the positioning and locking device enables bidirectional active clamping of the borehole inner wall, ensuring precise positioning of the sealing device.

[0032] By adjusting the gear-thread linkage mechanism between the component and the drive component, the moving locking mechanism moves synchronously to the center, pushing the sealing device to expand radially and adapt to different hole diameters;

[0033] By using the combination structure of rubber annular surface and honeycomb micro-protrusions in the sealing device, the rubber penetrates into the micro-fractures of the coal seam through the stress concentration effect of extrusion, forming an embedded seal, which significantly improves the sealing contact area and leakage resistance.

[0034] By controlling the forward and reverse rotation of the drive components, the sealing device can be quickly erected and retracted, simplifying the operation process and reducing the workload.

[0035] The wedge-shaped interlocking design between the positioning wedge and the inner wall of the borehole effectively resists the pressure of the internal medium and enhances the stability of the sealing.

[0036] The modular connection slot design enables quick assembly and disassembly of the push shaft and drive shaft, improving the device's turnover efficiency. Attached Figure Description

[0037] Figure 1 A schematic diagram of the overall structure of a fixed-point sealing device for coal mine drilling;

[0038] Figure 2 A schematic diagram of the positioning and locking device and the adjustment device;

[0039] Figure 3 A schematic diagram of the positioning and locking component structure;

[0040] Figure 4 This is a schematic diagram of the movable locking mechanism.

[0041] Figure 5 This is a schematic diagram of the driver component structure;

[0042] Figure 6 This is a schematic diagram of the sealing device structure;

[0043] Figure 7 This is a schematic diagram showing the connection between the limiting ring and the moving locking mechanism;

[0044] Figure 8 This is a schematic diagram of the connecting groove;

[0045] In the diagram: 1. Fixed shaft; 2. Positioning and locking device; 3. Adjusting component; 4. Drive component; 5. Sealing device; 6. Pushing shaft; 7. Connecting groove; 21. First positioning and locking component; 22. Second positioning and locking component; 31. Rotating sleeve shaft; 32. Threaded shaft; 33. Rotating gear; 41. Drive shaft; 42. Drive gear; 51. Limiting ring surface; 52. Adjusting spring; 53. Rubber ring surface; 54. Protrusion array; 211. Limiting bushing; 212. Connecting piece; 213. Moving locking mechanism; 2131. Adjusting piece; 2132. Positioning wedge. Detailed Implementation

[0046] Please see Figures 1 to 8 In this embodiment of the invention, a fixed-point sealing device for coal mine drilling includes:

[0047] Fixed shaft 1;

[0048] Positioning and locking device 2 is fixed on fixed shaft 1;

[0049] Adjustment component 3 is rotatably positioned at the center of fixed shaft 1;

[0050] The drive component 4 is rotatably mounted at one end of the positioning and locking device 2 and is connected to the adjustment component 3;

[0051] The sealing device 5 is fixed on the positioning and locking device 2 and is rotatably connected to the adjusting component 3;

[0052] Push axis 6 is controllably connected to fixed axis 1.

[0053] In this embodiment, the positioning and locking device 2 consists of a first positioning and locking component 21 and a second positioning and locking component 22 symmetrically distributed about the middle of the fixed shaft 1. The first positioning and locking component 21 and the second positioning and locking component 22 are respectively fixed at both ends of the fixed shaft 1 and have the same structure.

[0054] In other words, under the action of the first positioning and locking component 21 and the second positioning and locking component 22, the sealing position in the borehole is determined. The entire sealing device is placed at the sealing position by the push shaft 6, so that the sealing position is between the positioning and locking components. Then, the driving component 4 controls the operation of the adjusting component 3, controlling the first positioning and locking component 21 and the second positioning and locking component 22 to move towards the center, squeezing and supporting the sealing device 5. Under the squeezing action and the reverse force of the inner wall of the borehole, the sealing device 5 is completely attached to the borehole, sealing the borehole. Furthermore, the sealing device 5 is dynamically adjustable to adapt to boreholes of different diameters.

[0055] In this embodiment, the first positioning and locking component 21 includes:

[0056] A limiting bushing 211 is sleeved on the end of the fixed shaft 1, and a plurality of annularly distributed sliding grooves are provided inside the limiting bushing 211.

[0057] The connector 212 connects the fixed shaft 1 and the limiting bushing 211, and the connector 212 is offset from the slide groove;

[0058] Multiple movable locking mechanisms 213 are arranged in a ring and are slidably connected to the sliding groove in the limiting bushing 211.

[0059] In other words, under the drive of the drive component 4, the adjustment component 3 rotates. At this time, the limiting bushing 211 is restricted by the connecting piece 212 and is fixedly connected to the fixed shaft 1, maintaining a fixed state. This drives the moving locking mechanism 213 in the first positioning locking component 21 and the second positioning locking component 22 to move towards the center on the slide groove in the limiting bushing 211, thereby squeezing and supporting the sealing device 5, so that the sealing device 5 fits against the inner wall of the borehole, and seals and fixes the target point of the borehole.

[0060] In this embodiment, the movable locking mechanism 213 includes:

[0061] The adjusting component 2131 is slidably disposed in the limiting bushing 211 and is composed of an outer semi-cylinder and an inner rack.

[0062] The positioning wedge 2132 is fixed on the adjusting member 2131, and one vertical surface is slidably connected to the end of the sealing device 5.

[0063] In other words, under the rotation of the adjusting component 3, the inner rack of the adjusting component 2131 is driven by the adjusting component 3 to move along the groove in the limiting bushing 211 toward the sealing device 5, pushing the sealing device 5 to move on the adjusting component 3 to seal the borehole. It should be noted that the moving locking mechanism 213 is set at an angle with the opening side facing the sealing device 5. When the moving locking mechanism 213 moves toward the sealing device 5 and squeezes the sealing device 5, the adjusting component 2131 drives the positioning wedge 2132 to move. While the positioning wedge 2132 pushes the sealing device 5, it slides on the sealing device 5 until the top angle of the positioning wedge 2132 is in contact with the inner wall of the borehole. The sealing device 5 is fixed in position by multiple positioning wedges 2132 to prevent the internal pressure of the borehole from causing deviation in the position of the sealing device 5 and affecting the sealing stability.

[0064] In this embodiment, the adjustment component 3 includes:

[0065] Rotate the sleeve 31, which is rotatably located in the middle of the fixed shaft 1;

[0066] Two threaded shafts 32 are symmetrically distributed about the rotating sleeve shaft 31 and fixed at both ends of the rotating sleeve shaft 31. The threads of the two threaded shafts 32 at both ends are opposite and are respectively connected to the corresponding moving locking mechanism 213.

[0067] Rotate gear 33 and fix it to the threaded shaft 32 near the drive assembly 4.

[0068] In other words, the drive assembly 4 drives the rotating sleeve shaft 31 to rotate forward through the rotating gear 33, and then, under the action of the threaded shaft 32, drives the adjusting member 2131 in the first positioning and locking assembly 21 and the second positioning and locking assembly 22 to move towards the center. The positioning wedge 2132 squeezes and supports the sealing device 5 to seal the borehole. Similarly, the drive assembly 4 can drive the rotating sleeve shaft 31 to rotate in reverse through the rotating gear 33, and drive the adjusting member 2131 in the first positioning and locking assembly 21 and the second positioning and locking assembly 22 to move towards both ends through the threaded shaft 32, so that the sealing device 5 is separated from the inner wall of the borehole, so that the fixed-point sealing device can be taken out as a whole.

[0069] In this embodiment, the driving component 4 includes:

[0070] The drive shaft 41 is rotatably disposed within the second positioning and locking assembly 22, with one end of its outer side connected to an external control shaft;

[0071] The drive gear 42 is fixedly connected to the drive shaft 41 and meshes with the rotating gear 33.

[0072] In other words, under the action of the external control shaft, the drive shaft 41 drives the drive gear 42 to rotate, and then the drive gear 42 drives the rotating sleeve shaft 31 and the threaded shafts 32 at both ends to rotate through the rotating gear 33, thereby adjusting the moving locking mechanism 213 in the positioning locking device 2, and then squeezing the sealing device 5 to seal the drill hole.

[0073] In this embodiment, the sealing device 5 includes:

[0074] Two limiting ring surfaces 51 are symmetrically distributed and are rotatably connected to the rotating sleeve shaft 31, and are slidably disposed on the rotating sleeve shaft 31. The outer side is slidably connected to the corresponding moving locking mechanism 213.

[0075] Multiple adjusting springs 52 are arranged in a ring, with their two ends respectively locked inside the limiting ring surface 51;

[0076] A rubber ring surface 53 is sleeved on the outside of the adjusting spring 52, and its two ends are fixedly connected to the limiting ring surface 51. A protrusion array 54 is provided on the outer surface of the rubber ring surface 53.

[0077] In other words, when the rotating sleeve 31 drives the threaded shafts 32 at both ends to rotate clockwise, the movable locking mechanism 213 in the positioning and locking assembly at both ends moves towards the center, pushing the limiting ring surface 51 to move towards the center on the rotating sleeve 31, compressing the adjusting spring 52, supporting the rubber ring surface 53, and the positioning wedge 2132 slides on the limiting ring surface 51. After the rubber ring surface 53 is in contact with the inner wall of the drill hole, the movable locking mechanism 213 continues to push the limiting ring surface 51 until the movable locking mechanism... The positioning wedge 2132 on 213 fits against the inner wall of the borehole to fix the entire device. At this time, under the continuous reverse force applied to the inner wall of the borehole, the rubber ring surface 53 fits tightly against the inner wall of the borehole, and the protrusion array 54 on the rubber ring surface 53 generates local stress concentration during the extrusion process, which causes the rubber layer to penetrate into the micro-fractures of the coal seam to form an embedded seal, effectively increasing the sealing contact area and improving the sealing reliability. The protrusion array 54 is a honeycomb micro-protrusion (diameter 2mm, height 1mm).

[0078] In this embodiment, both the fixed shaft 1 and the drive shaft 41 are provided with a connecting groove 7 at one end near the outside of the borehole. The fixed shaft 1 is controllably connected to the push shaft 6 through the connecting groove 7, and the drive shaft 41 is controllably connected to the external control shaft through the connecting groove 7.

[0079] In other words, under the action of the connecting groove 7, the push shaft 6 is fixedly connected to the fixed shaft 1. The push shaft 6 is used to place the fixed-point sealing device in the designated position in the borehole and fix the position of the positioning locking device 2. Similarly, under the action of the connecting groove 7, the external control shaft is fixedly connected to the drive shaft 41. The drive shaft drives the drive assembly 4 to rotate, thereby controlling the adjustment assembly 3. Under the action of the positioning locking device 2, the sealing device 5 completes the sealing of the borehole. After the borehole is sealed, the control shaft and the push shaft 6 can be disengaged and withdrawn. The connecting groove 7 can be connected to the control shaft and the push shaft 6 by electromagnetic connection or by bayonet block.

[0080] In practice, the push shaft 6 is first fixedly connected to the fixed shaft 1 via the connecting groove 7, and the external control shaft is fixedly connected to the drive shaft 41. The entire fixed-point sealing device is placed at the target position inside the borehole via the push shaft 6, so that the push shaft 6, the fixed shaft 1, and the positioning and locking device 2 remain in a fixed position. Then, the control shaft rotates, and the drive shaft 41 and the drive gear 42 rotate synchronously. In turn, the rotating gear 33 drives the adjusting component 3 to rotate forward, that is, the rotating sleeve shaft 31 rotates in the limiting ring surface 51, and at the same time, the threaded shafts 32 at both ends rotate. Then, the threaded shafts 32 are adjusted by the adjusting component. The rack on the inner side of 2131 drives the movable locking mechanism 213 in the positioning and locking components at both ends to move towards the center. The positioning wedge 2132 pushes the limiting ring surface 51 to move towards the center on the rotating sleeve shaft 31, compressing the adjusting spring 52 and supporting the rubber ring surface 53. The positioning wedge 2132 slides on the limiting ring surface 51. After the rubber ring surface 53 is in contact with the inner wall of the borehole, the movable locking mechanism 213 continues to push the limiting ring surface 51 until the positioning wedge 2132 on the movable locking mechanism 213 is in contact with the inner wall of the borehole, thus securing the entire device. At this point, under the continuous reverse force applied to the inner wall of the borehole, the rubber annular surface 53 is tightly fitted to the inner wall of the borehole, and the protrusion array 54 on the rubber annular surface 53 generates local stress concentration during the extrusion process, causing the rubber layer to penetrate into the micro-fractures of the coal seam to form an embedded seal, effectively increasing the sealing contact area and improving the sealing reliability. After the borehole is sealed, the control shaft and the push shaft 6 can be disengaged and withdrawn. When it is necessary to retrieve the fixed-point sealing device, the control shaft can be rotated, the drive shaft 41 and the drive gear 42 can be rotated synchronously, and then the adjustment component 3 can be driven by the rotation gear 33. The body reverses, that is, the rotating sleeve shaft 31 rotates in the limiting ring surface 51, and at the same time the threaded shafts 32 at both ends rotate. Then, the threaded shafts 32 drive the moving locking mechanism 213 in the positioning locking assembly at both ends to move to both ends on the sliding groove in the limiting sleeve 211 through the rack on the inner side of the adjusting component 2131. The positioning wedge 2132 gradually disengages from the inner wall of the drill hole. Under the action of the adjusting spring 52, the limiting ring surface 51 at both ends is pushed to reset with the positioning wedge 2132, so that the rubber ring surface 53 disengages from the inner wall of the drill hole. Then, the entire fixed-point sealing device can be removed from the drill hole by the pushing shaft 6.

[0081] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fixed-point sealing device for coal mine drilling, characterized in that: include: Fixed shaft (1); Positioning and locking device (2) is fixed on fixed shaft (1); Adjustment component (3) is rotatably set in the middle of fixed shaft (1); The drive component (4) is rotatably mounted at one end of the positioning and locking device (2) and connected to the adjustment component (3); The sealing device (5) is fixed on the positioning and locking device (2) and is rotatably connected to the adjusting component (3); The push axis (6) is controllably connected to the fixed axis (1); The positioning and locking device (2) consists of a first positioning and locking component (21) and a second positioning and locking component (22) symmetrically distributed about the middle of the fixed shaft (1). The first positioning and locking component (21) and the second positioning and locking component (22) are respectively fixed at both ends of the fixed shaft (1) and have the same structure. The first positioning and locking component (21) includes: A limiting bushing (211) is sleeved on the end of the fixed shaft (1), and a plurality of annularly distributed grooves are provided inside the limiting bushing (211); A connector (212) connects the fixed shaft (1) and the limiting bushing (211), and the connector (212) is offset from the slide groove; The movable locking mechanism (213) is provided in multiple rings and is slidably connected to the slide groove in the limiting bushing (211); The adjustment component (3) includes: Rotate the sleeve shaft (31), which is rotatably located in the middle of the fixed shaft (1); Two threaded shafts (32) are symmetrically distributed about the rotating sleeve shaft (31), fixed at both ends of the rotating sleeve shaft (31), and the threads of the threaded shafts (32) at both ends are opposite, and are respectively connected to the corresponding moving locking mechanism (213); Rotating gear (33) is fixedly connected to threaded shaft (32) near drive assembly (4); The sealing device (5) includes: Two limiting ring surfaces (51) are symmetrically distributed and are rotatably connected to the rotating sleeve shaft (31), and are slidably disposed on the rotating sleeve shaft (31), with the outer side slidably connected to the corresponding moving locking mechanism (213); Adjusting springs (52) are arranged in a ring, with both ends respectively locked inside the limiting ring surface (51); A rubber ring surface (53) is sleeved on the outside of the adjusting spring (52), and its two ends are fixedly connected to the limiting ring surface (51). A protrusion array (54) is provided on the outer surface of the rubber ring surface (53).

2. The fixed-point sealing device for coal mine drilling according to claim 1, characterized in that: The movable locking mechanism (213) includes: The adjusting component (2131) is slidably disposed in the limiting bushing (211) and is composed of an outer semi-cylinder and an inner rack; The positioning wedge (2132) is fixed on the adjusting member (2131), and one vertical surface is slidably connected to the end of the sealing device (5).

3. A fixed-point sealing device for coal mine drilling according to claim 1, characterized in that: The driving component (4) includes: The drive shaft (41) is rotatably disposed within the second positioning and locking assembly (22), with one end of its outer side connected to an external control shaft; The drive gear (42) is fixedly connected to the drive shaft (41) and meshes with the rotating gear (33).

4. A fixed-point sealing device for coal mine drilling according to claim 3, characterized in that: Both the fixed shaft (1) and the drive shaft (41) have a connecting groove (7) at one end near the outside of the borehole. The fixed shaft (1) is controllably connected to the push shaft (6) through the connecting groove (7), and the drive shaft (41) is controllably connected to the external control shaft through the connecting groove (7).

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