Directional fracturing device for coal mine

Abstract

The invention relates to the technical field of coal mining, in particular to a directional fracturing device for a coal mine, which comprises an infusion communicating pipe, the lower end of the infusion communicating pipe is fixedly connected with a sealing top cover, and the outer surface of the infusion communicating pipe is fixedly connected with a sealing sleeve shell. According to the device, an upper moving ring can be pushed by utilizing an extrusion ring through extension of a telescopic rod, so that the upper moving ring moves downwards, an upper folding plate and a lower folding plate are extruded, the upper folding plate and the lower folding plate are folded and unfolded outwards, and the folded upper folding plate and the folded lower folding plate can push a barrier near a liquid outlet; the lower folding plate can be used for blocking and controlling the fracturing devices at different positions to work, so that the high-pressure liquid can be discharged from the planned liquid outlet, and the working efficiency of the fracturing devices is improved. The problem that when a liquid outlet is directly blocked by a hard object, the liquid discharging direction is easily dispersed, and fracturing operation cannot be conducted by pressing a preset route is solved.

Description

Technical Field

[0001] The present application relates to the technical field of coal mining, and in particular to a directional fracturing device for coal mines. Background Art

[0002] In coal mining, mine gas disasters have always been one of the main disasters threatening coal mine safety production. At present, the most common and effective technical means for mine gas control is coal seam gas extraction, which extracts the gas in the coal seam in advance and reduces the gas content in the coal seam to meet the safe and efficient mining of coal mines. Most of the coal seams in my country are broken and soft, with low permeability. It is difficult to drill holes in this coal seam, and it is easy to drill holes in the roof (bottom) of the coal seam, but the direction of fracturing cracks is difficult to control. The directional perforating device is an important means to ensure that the cracks start to crack into the coal seam. Directional fracturing is an important means and development direction for coal seam gas control in the future.

[0003] Through searching, Chinese patent announcement number CN115596422B discloses a continuous oil pipe horizontal well shale oil directional fracturing device and method, the former includes a connector, a motor head assembly, a straightener, a pulse generator, a self-adjusting director, a spray gun and a guide shoe connected together from top to bottom. The invention has a reasonable and compact structure. The pulse generator enables the pulse fluid at the nozzle outlet to achieve energy enhancement in the perforation hole during the fracturing process. The fluid acts on the inner side of the upper part of the track pipe to move the track pipe downward in the upper outer tube. After the self-adjusting director enters the horizontal well section, the guide ball first rolls to the lowest point of the outer ring groove under the action of gravity. When the guide ball moves to the end of the guide groove away from the outer ring groove, the guide ball and the fluid in the track pipe act on the track pipe together, causing the spray gun and nozzle connected to the track pipe to rotate;

[0004] With respect to the above-mentioned related technologies, it is believed that the following defects exist:

[0005] 1 After the traditional fracturing device injects high-pressure liquid, when the discharge port is directly blocked by hard objects such as underground rocks, the high-pressure liquid will not flow in the predetermined direction due to the influence of flow velocity pressure at the discharge port, and a lot of financial and material resources will be consumed in pushing the blocking rocks.

[0006] 2. The traditional fracturing device needs to be dragged in the preset pipeline for positioning fracturing operations. During the dragging and retracting process, the expansion block of the sealing device will damage the preset holes.

[0007] 3. It is troublesome to change the liquid output direction of the fracturing device, and it is not possible to change the liquid output direction simply and quickly. Summary of the invention

[0008] In order to solve the problems raised in the background technology, the present application provides a directional fracturing device for coal mines.

[0009] The directional fracturing device for coal mines provided in the present application adopts the following technical scheme: it comprises an injection connecting pipe, the lower end of the injection connecting pipe is fixedly connected to a sealing top cover, the outer surface of the injection connecting pipe is fixedly connected to a sealing sleeve shell, the inner side of the sealing sleeve shell is fixedly connected to a direction adjustment motor, the output end of the direction adjustment motor is fixedly connected to a direction adjustment gear, the outer surface of the direction adjustment gear is meshed with a direction adjustment mechanism, the outer surface of the injection connecting pipe is provided with an expansion mechanism, the expansion mechanism comprises a first positioning ring, the first positioning ring is fixedly connected to the outer side of the injection connecting pipe, the surface of the injection connecting pipe is fixedly connected to a second positioning ring, and the same group The second positioning ring of the expansion mechanism is arranged above the first positioning ring, a sealing motor is fixedly connected to the inner side of the second positioning ring, a sealing gear is fixedly connected to the output end of the sealing motor, a linkage mechanism is meshed on the surface of the sealing gear, an expansion component is slidably connected to the inner side of the linkage mechanism, a guide ring is fixedly connected to the surface of the infusion connecting pipe, the expansion component is slidably connected to the guide ring, the expansion mechanism array is distributed on the outer side of the infusion connecting pipe, the upper and lower expansion mechanisms form a group, a bursting component is fixedly connected to the end face of the expansion mechanism, a bursting pressure ring is arranged on the upper end of the bursting component, and the bursting pressure ring is connected to the expansion mechanism

[0010] Optionally, the adjustment mechanism includes an adjustment gear ring and a masking plate. The adjustment gear ring has a circular ring shape, and teeth are arranged on the outer peripheral surface of the adjustment gear ring. The teeth of the adjustment gear ring are meshed with the adjustment gear. The inner peripheral surface of the adjustment gear ring is connected to the masking plate through a round rod. The round rod between the adjustment gear ring and the masking plate passes through the infusion connecting tube. The masking plate is a bent arc plate, and the outer surface of the masking plate is in contact with the inner surface of the infusion connecting tube.

[0011] Optionally, the linkage mechanism includes an upper pushing ring, a lower pushing ring, a connecting plate and a linkage rack. The upper and lower ends of the connecting plate are fixedly connected to the upper pushing ring and the lower pushing ring respectively. The end face of the upper pushing ring is provided with a movable groove. The lower surface array of the upper pushing ring is provided with a first sliding push rod. The upper surface array of the lower pushing ring is provided with a second sliding push rod. The linkage rack is arc-shaped and fixedly arranged on the surface of the connecting plate. The linkage rack passes through the movable groove and meshes with the sealing section gear.

[0012] Optionally, the expansion assembly is divided into an upper expansion block and a lower expansion block, an arc-shaped groove is arranged on the upper surface of the upper expansion block, a first sliding rod is on the inner side of the arc-shaped groove of the upper expansion block, an arc-shaped groove is arranged on the lower surface of the lower expansion block, and a second sliding rod is on the inner side of the arc-shaped groove of the lower expansion block. Both the upper expansion block and the lower expansion block are formed into a circular ring shape by several groups of circular arrays, the upper expansion block and the lower expansion block are staggered, and a guide groove is arranged on the side where the upper expansion block and the lower expansion block are close to each other.

[0013] Optionally, the inner side of the guide ring is a circular ring fixedly connected to the surface of the infusion connecting tube, and the outer surface of the circular ring of the guide ring is fixedly connected to a guide plate, and the guide plate is slidably connected to the guide groove.

[0014] Optionally, the bursting assembly includes a lower fixing ring, which is fixedly connected to the upper surface of the second positioning ring, the upper end of the lower fixing ring is fixedly connected to a lower reinforcement ring, the upper end of the lower reinforcement ring is connected to a lower folding plate, the inner side of the lower folding plate is provided with a lower elastic hoop, the upper end of the lower folding plate is hinged to an upper folding plate, the inner side of the upper folding plate is provided with an upper elastic hoop, the upper end of the upper folding plate is connected to an upper reinforcement ring, and the upper end of the upper reinforcement ring is fixedly connected to an upper movable ring.

[0015] Optionally, the bursting pressure ring includes a telescopic rod and an extrusion ring, the upper end of the telescopic rod is fixedly connected to the lower surface of the first positioning ring, the lower end of the telescopic rod is fixedly connected to the extrusion ring, and the extrusion ring is fixedly connected to the upper movable ring.

[0016] Optionally, the infusion connecting tube has a cylindrical shape, a limited movement groove is provided on the surface of the infusion connecting tube, the connecting plate is slidably connected inside the limited movement groove, a drainage port is provided on the surface of the infusion connecting tube, the drainage port is blocked and sealed by the lower folding plate, and an arc groove through which the adjustment mechanism passes is provided on the surface of the infusion connecting tube.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] 1. The directional fracturing device for coal mines uses an extrusion ring to push the upper movable ring by extending the telescopic rod, so that the upper movable ring moves downward, so that the upper folding plate and the lower folding plate are squeezed, so that the upper folding plate and the lower folding plate are folded and opened outward, so that the folded upper folding plate and the lower folding plate can push the obstruction near the discharge port, so that the obstruction outside the retention position of the discharge port can be pushed out, so that the high-pressure liquid can be discharged from the predetermined position, and at the same time, the lower folding plate can be used to block and control the fracturing device at different positions to work, so that the high-pressure liquid can be discharged from the planned discharge port, which solves the problem that when the discharge port is directly blocked by a hard object, the discharge direction is easily dispersed and the fracturing operation cannot be performed according to the predetermined route.

[0019] 2. The directional fracturing device for coal mine drives the sealing gear to rotate through the sealing motor, so that the sealing gear drives the linkage mechanism to rotate, so that the upper push ring drives the upper expansion block to slide outward along the guide ring, and the lower push ring drives the lower expansion block to slide outward along the guide ring, so that the upper expansion block and the lower expansion block are slid and expanded and then clamped on the inner side of the hole wall. By starting the upper and lower expansion mechanisms of the same group at the same time, a relatively sealed space is formed in the hole, the position of the fracturing device is fixed, and a closed space is formed to prepare for the injection of high-pressure liquid, which solves the problem that the expansion device cannot expand in time to form a closed space or cannot be retracted in time to damage the preset hole wall during movement.

[0020] 3. The directional fracturing device for coal mines drives the steering gear to rotate through the steering motor, so that the steering gear drives the steering mechanism to rotate, so that the shielding plate can rotate inside the infusion connecting pipe, so that the shielding plate blocks the discharge ports in different directions, so that the liquid inside the infusion connecting pipe can be discharged in a direction, so that the fracturing device achieves a directional effect, and solves the problem that it is troublesome to change the liquid output direction of the fracturing device and it is difficult to change the liquid output direction simply and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the expansion mechanism structure in the embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the structure of the lower folding plate in the embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the structure of the upper expansion block in an embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the upper push ring structure in an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the guide ring structure in an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the linkage mechanism structure in the embodiment of the present application;

[0028] Figure 8 This is a schematic diagram of the structure of the adjustment mechanism in the embodiment of the present application;

[0029] Fig. 9 This is a schematic diagram of the structure of the shielding plate in an embodiment of the present application;

[0030] Fig.10 It is a schematic diagram of the structure of the infusion connecting pipe in the embodiment of the present application.

[0031] Description of the drawings: 1. Infusion connecting pipe; 101. Limiting movable groove; 102. Discharge port; 103. Arc groove; 2. Sealing top cover; 3. Sealing casing; 4. Adjustment motor; 5. Adjustment gear; 6. Adjustment mechanism; 61. Adjustment gear ring; 62. Shielding plate; 7. Expansion mechanism; 71. First positioning ring; 72. Second positioning ring; 73. Sealing motor; 74. Sealing gear; 75. Linkage mechanism; 751. Upper push ring; 7511. Movable groove; 7512. First sliding push rod; 752. Lower push rod Moving ring; 7521, second sliding push rod; 753, connecting plate; 754, linkage rack; 76, expansion assembly; 761, upper expansion block; 762, lower expansion block; 763, guide slide groove; 77, guide ring; 8, bursting assembly; 81, lower fixed ring; 82, lower reinforcement ring; 83, lower folding plate; 84, lower elastic hoop; 85, upper folding plate; 86, upper elastic hoop; 87, upper reinforcement ring; 88, upper movable ring; 9, bursting pressure ring; 91, telescopic rod; 92, extrusion ring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-10 This application is described in further detail.

[0033] The present application embodiment discloses a directional fracturing device for coal mines. Figure 1-10As shown, it includes an infusion connecting tube 1, a sealing top cover 2 is fixedly connected to the lower end of the infusion connecting tube 1, a sealing sleeve 3 is fixedly connected to the outer surface of the infusion connecting tube 1, a direction adjustment motor 4 is fixedly connected to the inner side of the sealing sleeve 3, a direction adjustment gear 5 is fixedly connected to the output end of the direction adjustment motor 4, and a direction adjustment mechanism 6 is meshed on the outer surface of the direction adjustment gear 5, and an expansion mechanism 7 is arranged on the outer surface of the infusion connecting tube 1, and the expansion mechanism 7 includes a first positioning ring 71, the first positioning ring 71 is fixedly connected to the outer side of the infusion connecting tube 1, and a second positioning ring 72 is fixedly connected to the surface of the infusion connecting tube 1, and the second positioning ring 72 of the same group of expansion mechanisms 7 is arranged above the first positioning ring 71, and a sealing motor 73 is fixedly connected to the inner side of the second positioning ring 72, and a sealing gear 74 is fixedly connected to the output end of the sealing motor 73, and a linkage mechanism 6 is meshed on the surface of the sealing gear 74. Structure 75, the expansion component 76 is slidably connected to the inner side of the linkage mechanism 75, the linkage mechanism 75 includes an upper push ring 751, a lower push ring 752, a connecting plate 753 and a linkage rack 754, the upper and lower ends of the connecting plate 753 are fixedly connected to the upper push ring 751 and the lower push ring 752 respectively, the end face of the upper push ring 751 is provided with a movable groove 7511, the lower surface array of the upper push ring 751 is provided with a first sliding push rod 7512, the upper surface array of the lower push ring 752 is provided with a second sliding push rod 7521, the linkage rack 754 is arc-shaped and fixedly arranged on the surface of the connecting plate 753, the linkage rack 754 passes through the movable groove 7511 and meshes with the sealing gear 74, the linkage mechanism 75 can rotate the upper push ring 751 and the lower push ring 752 to enable the expansion component 76 to expand and stretch.

[0034] The surface of the infusion connecting tube 1 is fixedly connected with a guide ring 77, and the expansion assembly 76 is slidably connected to the guide ring 77. The expansion assembly 76 is divided into an upper expansion block 761 and a lower expansion block 762. The upper surface of the upper expansion block 761 is provided with an arc-shaped slide groove, and the first slide rod 7512 is inside the arc-shaped slide groove of the upper expansion block 761. The lower surface of the lower expansion block 762 is provided with an arc-shaped slide groove, and the second slide rod 7521 is inside the arc-shaped slide groove of the lower expansion block 762. The upper expansion block 761 and the lower expansion block 762 are both formed into a circular ring by a plurality of groups of circular arrays. The expansion block 761 and the lower expansion block 762 are staggered, and a guide groove 763 is provided on the side where the upper expansion block 761 and the lower expansion block 762 are close to each other. The expansion assembly 76 slides outward along the guide ring 77 through the upper expansion block 761 and the lower expansion block 762, so that the upper expansion block 761 and the lower expansion block 762 are clamped on the inner side of the hole wall after sliding and expanding. By starting the upper and lower expansion mechanisms 7 of the same group at the same time, a relatively sealed space is formed in the hole, the position of the fracturing device is fixed, and a closed space is formed to prepare for the injection of high-pressure liquid.

[0035] The expansion mechanism 7 array is distributed on the outside of the infusion connecting tube 1, the inner side of the guide ring 77 is a circular ring fixedly connected to the surface of the infusion connecting tube 1, the outer surface of the circular ring of the guide ring 77 is fixedly connected with a guide plate, and the guide plate is slidably connected to the guide groove 763. The guide ring 77 can control the sliding direction of the upper expansion block 761 and the lower expansion block 762 of the expansion assembly 76.

[0036] The upper and lower expansion mechanisms 7 form a group, and the end face of the expansion mechanism 7 is fixedly connected with a bursting assembly 8. The upper end of the bursting assembly 8 is provided with a bursting pressure ring 9, which is connected to the expansion mechanism 7. The bursting pressure ring 9 includes a telescopic rod 91 and an extrusion ring 92. The upper end of the telescopic rod 91 is fixedly connected to the lower surface of the first positioning ring 71, and the lower end of the telescopic rod 91 is fixedly connected with an extrusion ring 92. The extrusion ring 92 is fixedly connected to the upper movable ring 88, and the bursting pressure ring 9 can push the bursting assembly 8 to slide downward.

[0037] The infusion connecting tube 1 has a cylindrical shape, and a limited movable groove 101 is arranged on the surface of the infusion connecting tube 1. The connecting plate 753 is slidably connected inside the limited movable groove 101. A discharge port 102 is arranged on the surface of the infusion connecting tube 1, and the discharge port 102 is blocked and sealed by the lower folding plate 83. An arc groove 103 penetrating the adjustment mechanism 6 is arranged on the surface of the infusion connecting tube 1. The infusion connecting tube 1 can facilitate the flow and discharge of high-pressure liquid.

[0038] The steering mechanism 6 includes a steering gear ring 61 and a shielding plate 62. The steering gear ring 61 has a circular ring shape, and teeth are arranged on the outer peripheral surface of the steering gear ring 61. The teeth of the steering gear ring 61 mesh with the steering gear 5. The inner peripheral surface of the steering gear ring 61 is connected to the shielding plate 62 through a round rod. The round rod between the steering gear ring 61 and the shielding plate 62 passes through the infusion connecting pipe 1. The shielding plate 62 is a bent arc plate. The outer surface of the shielding plate 62 fits the inner surface of the infusion connecting pipe 1. The steering mechanism 6 can rotate through the shielding plate 62, so that the shielding plate 62 blocks the discharge port 102 in different directions, so that the liquid inside the infusion connecting pipe 1 can be discharged in a direction, so that the fracturing device can achieve a directional effect.

[0039] The bursting assembly 8 includes a lower fixing ring 81, which is fixedly connected to the upper surface of the second positioning ring 72, a lower reinforcing ring 82 is fixedly connected to the upper end of the lower fixing ring 81, a lower folding plate 83 is connected to the upper end of the lower reinforcing ring 82, a lower elastic hoop 84 is arranged inside the lower folding plate 83, an upper folding plate 85 is hinged to the upper end of the lower folding plate 83, an upper elastic hoop 86 is arranged inside the upper folding plate 85, an upper reinforcing ring 87 is connected to the upper end of the upper folding plate 85, and the upper end of the upper reinforcing ring 87 is fixed The upper movable ring 88 is connected, and the bursting assembly 8 can be folded and opened outward through the upper folding plate 85 and the lower folding plate 83, so that the folded upper folding plate 85 and the lower folding plate 83 can push the obstruction near the discharge port 102, so that the obstruction outside the position where the discharge port 102 stays can be pushed out, so that the high-pressure liquid can be discharged from the predetermined position and direction, and at the same time, the lower folding plate 83 can be used to block and control the fracturing devices at different positions to work, so that the high-pressure liquid can be discharged from the planned discharge port 102.

[0040] The implementation principle of the directional fracturing device for coal mines in the embodiment of the present application is as follows: when in use, firstly, the device is put into the preset hole as a whole. When the device reaches the preset position, the sealing gear 74 is driven to rotate by starting the sealing motor 73, so that the sealing gear 74 drives the linkage mechanism 75 to rotate, so that the upper push ring 751 pushes the upper expansion block 761 to slide outward along the guide ring 77, and the lower push ring 752 pushes the lower expansion block 762 to slide outward along the guide ring 77, so that the upper expansion block 761 and the lower expansion block 762 are slid and expanded and then clamped on the inner side of the hole wall, and the upper and lower expansion mechanisms 7 of the same group are started at the same time to form a relatively sealed space in the hole, so that the position of the fracturing device is fixed, and a closed space is formed to prepare for the injection of high-pressure liquid;

[0041] By starting the telescopic rod 91 of the bursting pressure ring 9, the telescopic rod 91 is extended and the squeezing ring 92 is used to push the upper movable ring 88, so that the upper movable ring 88 moves downward, so that the upper folding plate 85 and the lower folding plate 83 are squeezed, so that the upper folding plate 85 and the lower folding plate 83 are folded outward and opened, so that the folded upper folding plate 85 and the lower folding plate 83 can push the obstruction near the discharge port 102, and the lower elastic hoop 84 and the upper elastic hoop 86 are set to make the lower folding plate 85 and the lower folding plate 83 When the stacking plate 83 is reset, it can fit and block the discharge port 102. By setting the lower reinforcing ring 82 and the upper reinforcing ring 87, it is prevented that the upper folding plate 85 and the lower folding plate 83 are bent to damage the bursting assembly 8, so that the obstruction outside the position where the discharge port 102 stays can be pushed out, so that the high-pressure liquid can be discharged from the predetermined position and direction. At the same time, the lower folding plate 83 can be used to block and control the fracturing devices at different positions to work, so that the high-pressure liquid can be discharged from the planned discharge port 102.

[0042] By starting the steering motor 4 to drive the steering gear 5 to rotate, the steering gear 5 pushes the steering mechanism 6 to rotate, so that the shielding plate 62 can rotate inside the infusion connecting pipe 1, so that the shielding plate 62 blocks the discharge ports 102 in different directions, so that the liquid inside the infusion connecting pipe 1 can be discharged in a directional manner, so that the fracturing device can achieve a directional effect.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A directional fracturing device for coal mines, comprising an injection connecting pipe (1), characterized in that: The lower end of the infusion connecting pipe (1) is fixedly connected to a sealing top cover (2), the outer surface of the infusion connecting pipe (1) is fixedly connected to a sealing sleeve (3), the inner side of the sealing sleeve (3) is fixedly connected to a direction adjustment motor (4), the output end of the direction adjustment motor (4) is fixedly connected to a direction adjustment gear (5), and the outer surface of the direction adjustment gear (5) is meshed with a direction adjustment mechanism (6); The outer surface of the infusion connecting tube (1) is provided with an expansion mechanism (7), the expansion mechanism (7) comprises a first positioning ring (71), the first positioning ring (71) is fixedly connected to the outer side of the infusion connecting tube (1), the surface of the infusion connecting tube (1) is fixedly connected with a second positioning ring (72), the second positioning ring (72) of the same group of expansion mechanisms (7) is arranged above the first positioning ring (71), the inner side of the second positioning ring (72) is fixedly connected with a segment sealing motor (73), the output end of the segment sealing motor (73) is fixedly connected with a segment sealing gear (74), the surface of the segment sealing gear (74) is meshed with a linkage mechanism (75), the inner side of the linkage mechanism (75) is slidably connected with an expansion component (76), the surface of the infusion connecting tube (1) is fixedly connected with a guide ring (77), the expansion component (76) is slidably connected with the guide ring (77); The expansion mechanisms (7) are arranged in an array outside the infusion connecting tube (1), and the upper and lower expansion mechanisms (7) form a group; The end surface of the expansion mechanism (7) is fixedly connected to a bursting assembly (8), and the upper end of the bursting assembly (8) is provided with a bursting pressure ring (9), which is connected to the expansion mechanism (7).

2. The directional fracturing device for coal mine according to claim 1, characterized in that: The direction adjustment mechanism (6) comprises a direction adjustment gear ring (61) and a shielding plate (62). The direction adjustment gear ring (61) is in the shape of a circular ring. The outer peripheral surface of the direction adjustment gear ring (61) is provided with teeth. The teeth of the direction adjustment gear ring (61) mesh with the direction adjustment gear (5). The inner peripheral surface of the direction adjustment gear ring (61) is connected to the shielding plate (62) via a round rod. The round rod between the direction adjustment gear ring (61) and the shielding plate (62) penetrates the infusion connecting pipe (1). The shielding plate (62) is a bent arc plate. The outer surface of the shielding plate (62) is in contact with the inner surface of the infusion connecting pipe (1).

3. The directional fracturing device for coal mine according to claim 1, characterized in that: The linkage mechanism (75) comprises an upper push ring (751), a lower push ring (752), a connecting plate (753) and a linkage rack (754); the upper and lower ends of the connecting plate (753) are fixedly connected to the upper push ring (751) and the lower push ring (752) respectively; the end surface of the upper push ring (751) is provided with a movable groove (7511); the lower surface of the upper push ring (751) is provided with a first sliding rod (7512); the upper surface of the lower push ring (752) is provided with a second sliding rod (7521); the linkage rack (754) is arc-shaped and fixedly arranged on the surface of the connecting plate (753); the linkage rack (754) passes through the movable groove (7511) and meshes with the sealing section gear (74).

4. The directional fracturing device for coal mine according to claim 3, characterized in that: The expansion assembly (76) is divided into an upper expansion block (761) and a lower expansion block (762). An arc-shaped groove is arranged on the upper surface of the upper expansion block (761). The first sliding rod (7512) is located on the inner side of the arc-shaped groove of the upper expansion block (761). An arc-shaped groove is arranged on the lower surface of the lower expansion block (762). The second sliding rod (7521) is located on the inner side of the arc-shaped groove of the lower expansion block (762). The upper expansion block (761) and the lower expansion block (762) are both formed into a circular ring by a plurality of groups of circular arrays. The upper expansion block (761) and the lower expansion block (762) are staggered. A guide groove (763) is arranged on the side where the upper expansion block (761) and the lower expansion block (762) are close to each other.

5. The directional fracturing device for coal mine according to claim 4, characterized in that: The inner side of the guide ring (77) is a circular ring fixedly connected to the surface of the infusion connecting tube (1), and the outer surface of the circular ring of the guide ring (77) is fixedly connected to a guide plate, which is slidably connected to the guide sliding groove (763).

6. The directional fracturing device for coal mine according to claim 3, characterized in that: The bursting assembly (8) comprises a lower fixing ring (81), the lower fixing ring (81) is fixedly connected to the upper surface of the second positioning ring (72), the upper end of the lower fixing ring (81) is fixedly connected to a lower reinforcing ring (82), the upper end of the lower reinforcing ring (82) is connected to a lower folding plate (83), a lower elastic hoop (84) is arranged on the inner side of the lower folding plate (83), an upper folding plate (85) is hingedly connected to the upper end of the lower folding plate (83), an upper elastic hoop (86) is arranged on the inner side of the upper folding plate (85), the upper end of the upper folding plate (85) is connected to an upper reinforcing ring (87), and the upper end of the upper reinforcing ring (87) is fixedly connected to an upper movable ring (88).

7. The directional fracturing device for coal mine according to claim 6, characterized in that: The bursting pressure ring (9) comprises a telescopic rod (91) and an extrusion ring (92); the upper end of the telescopic rod (91) is fixedly connected to the lower surface of the first positioning ring (71); the lower end of the telescopic rod (91) is fixedly connected to the extrusion ring (92); and the extrusion ring (92) is fixedly connected to the upper movable ring (88).

8. The directional fracturing device for coal mine according to claim 6, characterized in that: The infusion connecting tube (1) is cylindrical in shape, a limited displacement groove (101) is provided on the surface of the infusion connecting tube (1), a connecting plate (753) is slidably connected inside the limited displacement groove (101), a liquid discharge port (102) is provided on the surface of the infusion connecting tube (1), the liquid discharge port (102) is blocked and sealed by a lower folding plate (83), and an arc groove (103) through which a direction adjustment mechanism (6) passes is provided on the surface of the infusion connecting tube (1).

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