A hydraulic fracturing drilling sealing device for underground coal mines

Abstract

The present invention discloses a hydraulic fracturing borehole sealing device for underground coal mines, and relates to the technical field of borehole sealers. The borehole sealing device includes a No. 1 borehole sealer, a No. 2 borehole sealer, a connecting pipe, and a connector. One end of each of the No. 1 and No. 2 borehole sealers is provided with a connecting pipe, and a connector is provided between the two sets of connecting pipes. The connector includes a sleeve, a connecting ring, and a movable pipe. The middle portion of the inner surface of the sleeve is fixedly connected to the connecting ring, and the interior of the connecting ring is provided with a movable pipe. The present invention provides an installation assembly, rotates the rotating ring, and rotates it clockwise. Since the gear is engaged with tooth 2, the gear drives the rotating rod to rotate under the action of the rotating ring, and tooth 1 drives the movable pipe to rotate under the drive of the gear, thereby facilitating the simultaneous threaded connection of the sleeve and the connecting pipes at both ends.

Description

Technical Field

[0001] The invention relates to the technical field of hole sealers, in particular to a hydraulic fracturing drilling hole sealing device in an underground coal mine. Background Art

[0002] As gas-fired power generation technology matures, demand for this clean energy source will continue to grow. Improving gas extraction efficiency, minimizing leakage during extraction, and increasing extracted gas concentration are fundamental to gas utilization. Simple, reliable sealing equipment and processes underpin hydraulic fracturing's efforts to improve gas extraction efficiency.

[0003] People often use sealers to break coal, which can effectively prevent coal and gas explosions. Using high-pressure water injection to break the coal body can reduce pyrotechnic products, reduce costs, and increase workers' sense of safety.

[0004] In the existing technology, the drilling and sealing technologies in hydraulic fracturing technology mainly include cement slurry one-time grouting and hydraulic fracturing special sealing capsule sealing. The sealing devices mainly include gas extraction sealing devices and coal seam water injection sealing devices.

[0005] The existing patent (publication number: CN212428775U) is a new type of hydraulic fracturing sealer, including a No. 1 sealer, one end of which is fixedly provided with a water injection joint, and the end of the water injection joint away from the water injection port is provided with an expansion hose, the water injection joint and the expansion hose are fixedly connected by a locking tube iron sheet, and the end of the expansion hose away from the water injection joint is provided with an intermediate core, and the intermediate core and the expansion hose are fixedly connected by a locking tube iron sheet.

[0006] Although the above-mentioned hydraulic fracturing sealer has achieved the effects of simple structure, easy operation, time and cost saving, the docking and installation process between the sealer and each joint is very complicated. In the prior art, a pipe connection mechanism is usually used to connect the two. However, although the existing pipe connection mechanism can ensure the sealing of the connection, the installation process is relatively cumbersome, and it is impossible to install both ends of the connector at the same time. It cannot be used repeatedly, which is very inconvenient. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem that during the use of the existing hole sealer, the docking and installation process between the hole sealer and each joint is very complicated. In the prior art, the two are usually connected by a pipe connection mechanism. However, although the existing pipe connection mechanism can ensure the sealing of the connection, the installation process is relatively cumbersome and it is impossible to install both ends of the connector at the same time, which is very inconvenient. A hydraulic fracturing drilling sealing device for coal mines is proposed.

[0008] The object of the present invention can be achieved through the following technical solutions: A coal mine underground hydraulic fracturing drilling sealing device, comprising a No. 1 sealing device, a No. 2 sealing device, a connecting pipe and a connector, one end of each of the No. 1 sealing device and the No. 2 sealing device is provided with a connecting pipe, a connector is provided between the two groups of connecting pipes, the connector comprises a casing, a connecting ring and a movable pipe; the middle part of the inner surface of the casing is fixedly connected with a connecting ring, and the interior of the connecting ring is provided with a movable pipe, the two ends of the movable pipe respectively penetrate to the outside of the connecting ring, and the outer surface of the movable pipe is provided with a first thread near the two ends, the outer surface of the connecting pipe is provided with a second thread at a position corresponding to the movable pipe, and the connecting pipe is threadedly connected to the corresponding movable pipe;

[0009] A mounting assembly is provided at a position inside the connecting ring corresponding to the movable tube, and a limiting assembly is provided at positions on both sides of the connecting ring on the inner surface of the sleeve, and the limiting assembly is connected to the mounting assembly.

[0010] Furthermore, the mounting assembly includes an annular groove 1, an annular block, a tooth 1, a notch, a rotating rod and a gear; an annular groove 1 is provided on the inner surface of the connecting ring, and an annular block is rotatably connected inside the annular groove 1, the annular block is fixedly connected to the movable tube, and a plurality of groups of teeth 1 are fixedly connected at equal distances on the outer surface of the annular block, two groups of notches are symmetrically provided on the upper and lower sides of the inner surface of the annular groove 1, and a rotating rod is rotatably connected inside the notch, the two ends of the rotating rod respectively penetrate into the interior of the sleeve and are rotatably connected thereto, the outer surface of the rotating rod is fixedly connected to a gear at a position inside the notch, and the gear is meshed with tooth 1.

[0011] Furthermore, a second annular groove is provided at a position corresponding to the slot on the outer surface of the sleeve, and a rotating ring is connected to the interior of the second annular groove. The inner surface of the second annular groove is connected to the inner surface of the slot, and the gear passes through the outside of the slot and then extends to the inside of the second annular groove.

[0012] Furthermore, limiting grooves are provided on both sides of the inner surface of the annular groove 2, and the limiting grooves are annular. The inner surfaces of the two groups of limiting grooves are rotatably connected to limiting rings, the limiting rings are fixedly connected to the rotating ring, and the outer surface of the rotating ring extends to the outside of the annular groove 2. The outer surface of the sleeve is fixedly connected to annular blocks at positions on both sides of the annular groove 2, and the outer diameter of the cross section of the annular block is larger than the outer diameter of the cross section of the rotating ring. Several groups of teeth 2 are equidistantly arranged on the inner surface of the rotating ring, and the teeth 2 are meshed with the gear.

[0013] Furthermore, the limit assembly includes a mounting ring, a guide column, a block, a movable groove, a limit block and a spring; the outer surfaces of the two groups of rotating rods are provided with spirals with opposite rotation directions near both ends, and the two groups of spirals corresponding to the same group of rotating rods have opposite rotation directions. Two groups of mounting rings are symmetrically arranged between the two groups of rotating rods, and the mounting rings are spirally connected to the two groups of rotating rods.

[0014] Furthermore, guide columns are fixedly connected to the upper and lower sides of the inner surfaces of the two groups of mounting rings, and one end of the guide column is fixedly connected to the mounting ring, and the other end is movably connected to a clamping block. A movable groove is provided on the outer surface of the upper end of the clamping block, and the interior of the movable groove is movably connected to a limit block. The end of the guide column away from the mounting ring passes through the interior of the movable groove and is fixedly connected to the limit block.

[0015] Furthermore, a spring is provided on the outer surface of the guide column, and one end of the spring is fixedly connected to the mounting ring, and the other end is fixedly connected to the limit block. A slot is provided on the outer surface of the connecting tube near one end of the sleeve, and the cross-section of the slot is annular, and the inner surface of the slot fits with the outer surface of the block.

[0016] Furthermore, the installation method of the hydraulic fracturing drilling sealing device includes the following steps:

[0017] Step 1: Initially, the two sets of installation rings are located at the two ends of the casing away from the connecting ring. Therefore, when installing, first push the No. 1 and No. 2 hole sealers toward the connector until both sets of connecting tubes enter the casing and the clamping blocks are locked into the slots.

[0018] Step 2: After the card block is inserted into the card slot, rotate the rotating ring clockwise. Since the gear is engaged with tooth 2, the gear drives the rotating rod to rotate under the action of the rotating ring, and tooth 1 drives the movable tube to rotate under the drive of the gear.

[0019] Step 3: During the rotation of the rotating rod, the mounting ring moves toward the movable tube, and the connecting tube also moves toward the inside of the movable tube under the drive of the mounting ring. Since the outer surface of the movable tube and the inner surface of the connecting tube are both provided with threads, the movable tube and the connecting tube are threadedly connected until the rotating ring cannot rotate. At this time, the connection between the movable tube and the connecting tube is completed, and the No. 1 hole sealer and the No. 2 hole sealer are quickly connected at the same time.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, by setting up an installation component, the rotating ring is rotated to rotate clockwise. Since the gear is meshed with the tooth 2, the gear drives the rotating rod to rotate under the action of the rotating ring, and the tooth 1 drives the movable tube to rotate under the drive of the gear, thereby facilitating the simultaneous threaded connection of the casing and the connecting tubes at both ends; the transmission mode of the gear, tooth 1 and tooth 2 driving the movable tube has accurate transmission and high transmission efficiency, and long service life, thereby improving the assembly efficiency and service life of the fracturing drilling and sealing device.

[0022] In the present invention, by arranging the limit assembly and the installation assembly to cooperate with each other, during the rotation of the rotating rod, the installation ring moves in the direction close to the movable tube, and the connecting tube is also moved toward the inside of the movable tube under the drive of the installation ring until the rotating ring cannot rotate. At this time, the connection between the movable tube and the connecting tube is completed, thereby ensuring the sealing of the connection between the No. 1 hole sealer and the No. 2 hole sealer, and the No. 1 hole sealer and the No. 2 hole sealer can be quickly connected at the same time, and are easy to disassemble, and the connector can be reused. In this process, the connecting tube is driven by the card block to move in the direction of the movable tube, and there is no need to manually push the connecting tube, thereby realizing automatic threaded connection between the connecting tube and the movable tube, which is very convenient and easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the connector of the present invention;

[0026] Figure 3 For the present invention Figure 2 A magnified view of area A;

[0027] Figure 4 For the present invention Figure 2 A magnified view of area B;

[0028] Figure 5 This is a combined view of the card block and the card slot of the present invention;

[0029] Figure 6 It is a combined view of the gear and the notch of the present invention.

[0030] Figure numerals: 1. Sealer No. 1; 2. Sealer No. 2; 3. Connecting pipe; 4. Connector; 401. Sleeve; 402. Connecting ring; 403. Movable pipe; 5. Mounting assembly; 501. Annular groove 1; 502. Annular block; 503. Tooth 1; 504. Notch; 505. Rotating rod; 506. Gear; 507. Annular groove 2; 508. Rotating ring; 509. Limiting groove; 510. Limiting ring; 511. Annular block; 512. Tooth 2; 6. Limiting assembly; 601. Mounting ring; 602. Guide column; 603. Block; 604. Movable groove; 605. Limiting block; 606. Spring; 607. Slot. Implementation Method

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0032] like Figure 1-6 As shown, the present invention proposes a coal mine underground hydraulic fracturing drilling sealing device, including a No. 1 sealing device 1, a No. 2 sealing device 2, a connecting pipe 3 and a connector 4, one end of the No. 1 sealing device 1 and the No. 2 sealing device 2 are both provided with a connecting pipe 3, and a connector 4 is provided between the two groups of connecting pipes 3, and the connector 4 includes a casing 401, a connecting ring 402 and a movable pipe 403; the middle part of the inner surface of the casing 401 is fixedly connected with the connecting ring 402, and the interior of the connecting ring 402 is provided with a movable pipe 403, and the two ends of the movable pipe 403 respectively pass through the outside of the connecting ring 402, and the outer surface of the movable pipe 403 is provided with a thread 1 near the two ends, and the outer surface of the connecting pipe 3 is provided with a thread 2 at a position corresponding to the movable pipe 403, and the connecting pipe 3 is threadedly connected to the corresponding movable pipe 403. During the installation process, the No. 1 sealing device 1 and the No. 2 sealing device 2 are respectively connected to the two ends of the casing 401;

[0033] An installation assembly 5 is provided inside the connecting ring 402 at a position corresponding to the movable tube 403 , and a limiting assembly 6 is provided on the inner surface of the sleeve 401 at positions on both sides of the connecting ring 402 , and the limiting assembly 6 is connected to the installation assembly 5 . Example

[0034] like Figure 2 、 Figure 3 and Figure 6As shown, the difference between this embodiment and embodiment 1 is that the mounting assembly 5 includes an annular groove 501, an annular block 502, a tooth 503, a notch 504, a rotating rod 505 and a gear 506; an annular groove 501 is provided on the inner surface of the connecting ring 402, and an annular block 502 is rotatably connected inside the annular groove 501, the annular block 502 is fixedly connected to the movable tube 403, and a plurality of groups of teeth 503 are fixedly connected to the outer surface of the annular block 502 at equal distances, two groups of notches 504 are symmetrically provided on the upper and lower sides of the inner surface of the annular groove 501, and a rotating rod 505 is rotatably connected inside the notch 504, and both ends of the rotating rod 505 respectively penetrate into the interior of the sleeve 401 and are rotatably connected thereto, and a gear 506 is fixedly connected to the position of the outer surface of the rotating rod 505 inside the notch 504, and the gear 506 is meshed with the tooth 503.

[0035] An annular groove 2 507 is provided at a position corresponding to the notch 504 on the outer surface of the sleeve 401, and a rotating ring 508 is rotatably connected inside the annular groove 2 507. The inner surface of the annular groove 2 507 is communicated with the inner surface of the notch 504. The gear 506 passes through the outside of the notch 504 and then extends to the inside of the annular groove 2 507. The rotating ring 508 is rotated to rotate clockwise. Several groups of teeth 2 512 are equidistantly provided on the inner surface of the rotating ring 508, and the teeth 2 512 are meshed with the gear 506. Therefore, the gear 506 drives the rotating rod 505 to rotate under the action of the rotating ring 508, and the teeth 1 503 drives the movable tube 403 to rotate under the drive of the gear 506, thereby facilitating the simultaneous threaded connection of the sleeve 401 and the connecting tubes 3 at both ends.

[0036] Limiting grooves 509 are provided on both sides of the inner surface of the annular groove 507, and the limiting grooves 509 are annular. The inner surfaces of the two sets of limiting grooves 509 are rotatably connected to the limiting rings 510. The limiting rings 510 are fixedly connected to the rotating ring 508, and the outer surface of the rotating ring 508 extends to the outside of the annular groove 507. The outer surface of the sleeve 401 is fixedly connected to the positions on both sides of the annular groove 507, and the outer diameter of the cross section of the annular stopper 511 is larger than the outer diameter of the cross section of the rotating ring 508, so as to prevent the rotating ring 508 from contacting the ground and causing it to be unable to rotate. Example

[0037] like Figure 2-5 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the limiting assembly 6 includes a mounting ring 601, a guide column 602, a blocking block 603, a movable groove 604, a limiting block 605 and a spring 606; the outer surfaces of the two groups of rotating rods 505 are provided with spirals with opposite rotation directions near both ends, and the two groups of spirals corresponding to the same group of rotating rods 505 have opposite rotation directions, and two groups of mounting rings 601 are symmetrically arranged between the two groups of rotating rods 505, and the mounting rings 601 are spirally connected to the two groups of rotating rods 505.

[0038] The upper and lower sides of the inner surfaces of the two sets of mounting rings 601 are fixedly connected with guide columns 602, and one end of the guide column 602 is fixedly connected to the mounting ring 601, and the other end is movably connected to a clamping block 603. A movable groove 604 is provided on the outer surface of the upper end of the clamping block 603, and the inner movability of the movable groove 604 is connected to a limit block 605. The end of the guide column 602 away from the mounting ring 601 passes through the inner part of the movable groove 604 and is fixedly connected to the limit block 605. A spring 606 is provided on the outer surface of the guide column 602, and one end of the spring 606 is fixedly connected to the mounting ring 601, and the other end is connected to the limit block 605 is fixedly connected, and a slot 607 is provided on the outer surface of the connecting tube 3 near one end of the sleeve 401, and the cross section of the slot 607 is annular. The inner surface of the slot 607 fits the outer surface of the block 603. During installation, first push the No. 1 hole sealer 1 and the No. 2 hole sealer 2 toward the connector 4 until both sets of connecting tubes 3 enter the interior of the sleeve 401. The block 603 is squeezed by the connecting tube 3 and moves upward along the guide column 602 and squeezes the spring 606. When the block 603 corresponds to the slot 607, the block 603 enters the interior of the slot 607 under the action of the spring 606;

[0039] During the rotation of the rotating rod 505, the mounting ring 601 moves toward the direction close to the movable tube 403, and the connecting tube 3 also moves toward the inside of the movable tube 403 under the drive of the clamping block 603. Since the outer surface of the movable tube 403 and the inner surface of the connecting tube 3 are both provided with threads, the movable tube 403 is threadedly connected to the connecting tube 3 until the rotating ring 508 cannot rotate. At this time, the connection between the movable tube 403 and the connecting tube 3 is completed. In this process, the clamping block 603 is used to drive the connecting tube 3 to move in the direction of the movable tube 403. There is no need to manually push the connecting tube 3, thereby realizing automatic threaded connection between the connecting tube 3 and the movable tube 403, which is very convenient and easy to disassemble.

[0040] The installation process and working principle of the present invention:

[0041] Step 1: In the initial state, the two sets of installation rings 601 are respectively located at the two ends of the sleeve 401 away from the connecting ring 402. Therefore, during installation, first push the No. 1 hole sealer 1 and the No. 2 hole sealer 2 toward the connector 4 until both sets of connecting tubes 3 enter the interior of the sleeve 401. The clamping block 603 is squeezed by the connecting tube 3 and moves upward along the guide column 602 and compresses the spring 606. When the clamping block 603 corresponds to the clamping groove 607, the clamping block 603 enters the interior of the clamping groove 607 under the action of the spring 606;

[0042] Step 2: After the clamping block 603 is inserted into the clamping slot 607, the rotating ring 508 is rotated clockwise. Since the gear 506 is meshed with the second tooth 512, the gear 506 drives the rotating rod 505 to rotate under the action of the rotating ring 508. The first tooth 503 is driven by the gear 506 to rotate the movable tube 403.

[0043] Step 3: During the rotation of the rotating rod 505, the mounting ring 601 moves toward the movable tube 403, and the connecting tube 3 also moves toward the inside of the movable tube 403 under the drive of the mounting ring 601. Since the outer surface of the movable tube 403 and the inner surface of the connecting tube 3 are both provided with threads, the movable tube 403 is threadedly connected with the connecting tube 3 until the rotating ring 508 cannot rotate. At this time, the connection between the movable tube 403 and the connecting tube 3 is completed, thereby ensuring the sealing of the connection between the No. 1 hole sealer 1 and the No. 2 hole sealer 2, and the No. 1 hole sealer 1 and the No. 2 hole sealer 2 can be quickly connected at the same time, and are easy to disassemble, and the connector 4 can be reused;

[0044] Step 4. After the installation is completed, the drilling and sealing device is sent into the working position in the coal seam and rock formation hole, and then water and other media are injected. The No. 1 sealer 1 and the No. 2 sealer 2 expand and seal. Continue to inject water to make the pressure between the No. 1 sealer 1 and the No. 2 sealer 2 and the coal seam, rock formation, water and other media reach the coal seam fracturing pressure, which can achieve the effect of fracturing the coal seam and rock formation.

[0045] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

[0046] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A coal mine underground hydraulic fracturing drilling sealing device, comprising a No. 1 sealing device (1), a No. 2 sealing device (2), a connecting pipe (3) and a connector (4), wherein one end of each of the No. 1 sealing device (1) and the No. 2 sealing device (2) is provided with a connecting pipe (3), and a connector (4) is provided between the two groups of the connecting pipes (3), characterized in that: The connector (4) comprises a sleeve (401), a connecting ring (402) and a movable tube (403); the middle portion of the inner surface of the sleeve (401) is fixedly connected to the connecting ring (402), and the interior of the connecting ring (402) is provided with a movable tube (403), both ends of the movable tube (403) respectively penetrate the exterior of the connecting ring (402), and the outer surface of the movable tube (403) is provided with a first thread at positions near both ends, the outer surface of the connecting tube (3) is provided with a second thread at a position corresponding to the movable tube (403), and the connecting tube (3) is threadedly connected to the corresponding movable tube (403); A mounting assembly (5) is provided at a position inside the connecting ring (402) corresponding to the movable tube (403), and a limiting assembly (6) is provided on the inner surface of the sleeve (401) at positions on both sides of the connecting ring (402), and the limiting assembly (6) is connected to the mounting assembly (5); The mounting assembly (5) comprises an annular groove (501), an annular block (502), a tooth (503), a notch (504), a rotating rod (505) and a gear (506); an annular groove (501) is provided on the inner surface of the connecting ring (402); two groups of notches (504) are symmetrically provided on the upper and lower sides of the inner surface of the annular groove (501); and the rotating rod (505) is rotatably connected to the interior of the notch (504); The limiting assembly (6) includes a mounting ring (601), a guide column (602), a clamping block (603), a movable groove (604), a limiting block (605) and a spring (606), and two groups of mounting rings (601) are symmetrically arranged between the two groups of rotating rods (505); The upper and lower sides of the inner surfaces of the two sets of mounting rings (601) are fixedly connected with guide pillars (602), and one end of the guide pillar (602) is fixedly connected to the mounting ring (601), and the other end is movably connected to a clamping block (603); A spring (606) is provided on the outer surface of the guide column (602), and one end of the spring (606) is fixedly connected to the mounting ring (601), and the other end is fixedly connected to the limit block (605). A slot (607) is provided on the outer surface of the connecting tube (3) near one end of the sleeve (401), and the cross section of the slot (607) is annular, and the inner surface of the slot (607) is in contact with the outer surface of the block (603).

2. The underground hydraulic fracturing drilling and sealing device of coal mine according to claim 1, characterized in that: An annular block (502) is rotatably connected inside the annular groove (501), the annular block (502) is fixedly connected to the movable tube (403), and a plurality of groups of teeth (503) are fixedly connected at equal distances on the outer surface of the annular block (502). Both ends of the rotating rod (505) respectively penetrate the interior of the sleeve (401) and are rotatably connected thereto. A gear (506) is fixedly connected to the outer surface of the rotating rod (505) at a position inside the notch (504), and the gear (506) is meshed with the teeth (503).

3. The underground hydraulic fracturing drilling and sealing device of coal mine according to claim 2, characterized in that: A second annular groove (507) is provided at a position on the outer surface of the sleeve (401) corresponding to the notch (504), and the interior of the second annular groove (507) is rotatably connected to a rotating ring (508). The inner surface of the second annular groove (507) is in communication with the inner surface of the notch (504), and the gear (506) passes through the outside of the notch (504) and then extends to the inside of the second annular groove (507).

4. The underground coal mine hydraulic fracturing drilling and sealing device according to claim 3, characterized in that: Limiting grooves (509) are provided on both sides of the inner surface of the annular groove (507), and the limiting grooves (509) are annular. The inner surfaces of the two groups of limiting grooves (509) are rotatably connected to the limiting rings (510), and the limiting rings (510) are fixedly connected to the rotating ring (508), and the outer surface of the rotating ring (508) extends to the outside of the annular groove (507). The outer surface of the sleeve (401) is fixedly connected to the positions on both sides of the annular groove (507), and the outer diameter of the cross section of the annular stopper (511) is larger than the outer diameter of the cross section of the rotating ring (508). A plurality of groups of teeth (512) are equidistantly arranged on the inner surface of the rotating ring (508), and the teeth (512) are meshed with the gear (506).

5. The underground coal mine hydraulic fracturing drilling and sealing device according to claim 2, characterized in that: The outer surfaces of the two groups of rotating rods (505) are provided with spirals with opposite rotation directions near both ends. The two groups of spirals corresponding to the same group of rotating rods (505) have opposite rotation directions. The mounting ring (601) is spirally connected to the two groups of rotating rods (505).

6. The underground coal mine hydraulic fracturing drilling and sealing device according to claim 5, characterized in that: A movable groove (604) is provided on the outer surface of the upper end of the clamping block (603), and the movable groove (604) is internally movably connected to a limit block (605). The end of the guide column (602) away from the mounting ring (601) passes through the interior of the movable groove (604) and is fixedly connected to the limit block (605).

7. The underground coal mine hydraulic fracturing drilling and sealing device according to any one of claims 1 to 6, characterized in that: The installation method of the hydraulic fracturing drilling sealing device comprises the following steps: Step 1: In the initial state, the two sets of mounting rings (601) are respectively located at the two ends of the sleeve (401) away from the connecting ring (402). Therefore, when installing, first push the No. 1 hole sealer (1) and the No. 2 hole sealer (2) toward the connector (4) until both sets of connecting tubes (3) enter the interior of the sleeve (401) and the clamping block (603) is clamped into the clamping groove (607); Step 2: After the clamping block (603) is inserted into the clamping slot (607), the rotating ring (508) is rotated clockwise. Since the gear (506) is meshed with the second tooth (512), the gear (506) drives the rotating rod (505) to rotate under the action of the rotating ring (508), and the first tooth (503) drives the movable tube (403) to rotate under the drive of the gear (506); Step 3: During the rotation of the rotating rod (505), the mounting ring (601) moves toward the movable tube (403), and the connecting tube (3) also moves toward the inside of the movable tube (403) driven by the mounting ring (601). Since the outer surface of the movable tube (403) and the inner surface of the connecting tube (3) are both provided with threads, the movable tube (403) and the connecting tube (3) are threadedly connected until the rotating ring (508) cannot rotate. At this time, the connection between the movable tube (403) and the connecting tube (3) is completed, and the No. 1 hole sealer (1) and the No. 2 hole sealer (2) are quickly connected at the same time.

Images