A screen pipe hole fixing device for coal mine drilling

Abstract

The utility model discloses a kind of screen pipe hole fixing devices for coal mine drilling, setting fixed body;The one end of the fixed body is connected with guide head, and the fixed body is tubular structure, and the fixed body lateral wall opening is embedded with clamping jaw;Clamping jaw is set with torsion spring under pressure.The screen pipe hole fixing device for coal mine drilling provided by the utility model is simple in structure, reliable in fixing, which adopts the mode that torsion spring props open clamping jaw wing piece, not only increases the accommodation space of torsion spring, facilitates to adopt thicker diameter and more torsion turns torsion spring, increases torsion spring storage capacity, improves clamping jaw opening degree.It also improves the structural design of clamping jaw and the stress mode of claw tip, and the arc-shaped outer throw design of claw tip is more effective to embed hole wall by clamping jaw opening small angle, which is convenient for small aperture drilling application, and claw tip multi-tooth design is also beneficial to increase embedding firmness.

Description

Technical Field

[0001] This utility model belongs to the field of underground drilling engineering in coal mines and relates to a screen pipe hole fixing device for coal mine drilling. Background Technology

[0002] With increasing coal mining depth, coal and gas outburst hazards are becoming increasingly severe. Pre-drainage through drilling before coal seam mining is a common management method. To ensure effective gas drainage from the borehole, a screen pipe is typically used to maintain the continuous flow of the drainage channel. The screen pipe head is usually connected to a suspension device, which continuously pushes it to the bottom of the hole using the internal channel of the drill rod. After the suspension device passes through the openable drill bit, the jaws open and embed into the borehole wall to fix the screen pipe at the bottom of the hole. Then, the drill rod is pulled out, leaving the screen pipe inside the hole. Existing suspension devices mostly use a two-jaw suspension. However, due to limitations in opening force and jaw structure design, when the opening angle is small and the borehole wall is hard, the jaws often cannot effectively embed into the borehole wall. When the drill is pulled out, the screen pipe easily slips down the borehole wall due to friction, resulting in poor fixation. Utility Model Content

[0003] Based on the above, the purpose of this utility model is to provide a screen pipe hole fixing device for coal mine drilling, so as to solve the technical problems of existing screen pipe suspension devices such as incomplete opening of the claws, small opening force, and unstable embedding into the hole wall, and better meet the hole fixing requirements when the screen pipe is completed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A screen pipe hole fixing device for coal mine drilling includes a fixing body; one end of the fixing body is connected to a guide head, the fixing body is a tube structure, and a claw is embedded in the opening of the side wall of the fixing body; a torsion spring is pressed down on the claw.

[0006] Optionally, the fixing body is provided with a first mounting hole and a second mounting hole at intervals near the end of the guide head;

[0007] The first mounting hole and the second mounting hole are both symmetrically arranged on the side wall of the fixed body. The second mounting hole is used to fix the mounting claw, and the first mounting hole is used to fix the torsion spring.

[0008] Optionally, a retaining ring is also installed on the second mounting hole, and a torsion spring is fitted onto the retaining ring.

[0009] Optionally, the torsion spring includes an end of a mounting ring structure and a spring leaf extending along the tangent direction of the mounting ring.

[0010] Optionally, the claw includes a mounting ring fixed on the second mounting hole and a wing extending along the tangent of the mounting ring.

[0011] Optionally, a recessed hook structure is provided at the end of the wing, and the end of the hook has a serrated edge.

[0012] Optionally, a limiting protrusion may be provided on the edge of the mounting ring.

[0013] Optionally, the mounting ring is perpendicular to the winglet connection surface, and the thickness of the mounting ring is half the width of the winglet.

[0014] Optionally, the mounting end of the fixed body and the guide head is a male connector, and the other end is a female connector.

[0015] Preferably, the fixed body has a rectangular groove in the middle to accommodate the claw, and a second mounting hole and a first mounting hole are arranged in the rectangular groove at a 90° phase with the guide head. A pin is provided in the first mounting hole and the second mounting hole to install the torsion spring and the claw.

[0016] The device has two claws. The second mounting hole is used to install the claws. The torsion spring is sleeved on the fixing ring. The fixing ring is installed in the fixing body through the first mounting hole. The two torsion springs are respectively placed in the two claws.

[0017] The beneficial effects of this utility model are as follows:

[0018] The screen pipe fixing device for coal mine drilling provided by this utility model has a simple structure and reliable fixation. It adopts a torsion spring to open the claw wings, which not only increases the housing space of the torsion spring, making it convenient to use torsion springs with larger diameters and more torsion turns, but also increases the torsion spring storage capacity and improves the opening force of the claw. It also improves the structural design of the claw and the force distribution method of the claw tip. The arc-shaped outward projection design of the claw tip makes it easier for the claw to effectively embed into the hole wall at a small opening angle, which is convenient for small-diameter drilling applications. At the same time, the multi-tooth design of the claw tip also helps to increase the embedding firmness. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the internal fixing device for screen pipes used in coal mine drilling according to the present invention.

[0021] Figure 2 for Figure 1 A three-dimensional structural diagram;

[0022] Figure 3 for Figure 1 A 3D diagram of the claw structure in the image;

[0023] 1-Guide head, 2-Fixed body, 3-Claw, 4-Fixed ring, 5-Torsion spring;

[0024] 21-Male connector, 22-Female connector, 23-First mounting hole, 24-Second mounting hole, 25-Mounting groove;

[0025] 31-winglet, 32-hook, 33-limiting protrusion, 51-spring. Detailed Implementation

[0026] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Combination Figure 1-3 This utility model discloses a screen pipe fixing device for coal mine drilling, comprising a fixing body 2; one end of the fixing body 2 is connected to a guide head 1, and the fixing body 2 has a pipe structure. A claw 3 is embedded in the side opening of the fixing body 2; a torsion spring 5 is pressed down on the claw 3. The guide head 1 is connected to the fixing body 2 at the end; there are two claws, connected to the fixing body 2 by a pin; the pipe has two pin holes, one for the claw 3 and the other for the torsion spring 5; preferably, the torsion spring 5 is sleeved on a fixing ring 4, which is installed in the fixing body 2 through the pin hole, and the two spring plates 51 of the torsion spring 5 are respectively placed in the two claws 3; the front of the guide head 1 is a hemispherical guide head, and the rear is a female connector connected to the male connector 21 of the fixing body 2; the screen pipe for coal mine drilling provided by this utility model... The internal fixing device for pipe holes is simple in structure and reliable in fixing. It adopts the method of using a torsion spring 5 to open the wing 31 on the jaw 3. This not only increases the accommodation space of the torsion spring 5, making it convenient to use a torsion spring 5 with a larger diameter and more torsion coils, but also increases the storage capacity of the torsion spring 5 and improves the opening force of the jaw 3. It also improves the structural design of the jaw 3 and the force-bearing method of the jaw tip. The arc-shaped outward projection design of the jaw tip is more conducive to the effective embedding of the jaw into the hole wall when the jaw opens at a small angle, which is convenient for small-diameter drilling applications. At the same time, the multi-tooth design of the jaw tip also helps to increase the embedding firmness.

[0028] In this disclosure, a first mounting hole 23 and a second mounting hole 24 are provided at intervals at the end of the fixed body 2 near the guide head 1; both the first mounting hole 23 and the second mounting hole 24 are symmetrically arranged on the side wall of the fixed body 2, the second mounting hole 24 is used to fix the mounting claw 3, and the first mounting hole 23 is used to fix the torsion spring 5. The torsion spring 5 is installed at different positions on the fixed body 2, which not only increases the accommodation space of the torsion spring 5, but also facilitates the use of torsion springs 5 ​​with a larger diameter and more torsion coils, increases the storage capacity of the torsion spring 5, and improves the opening force of the claw 3;

[0029] In this disclosure, a retaining ring 4 is also installed on the second mounting hole 24, and a torsion spring 5 is fitted onto the retaining ring 4. The retaining ring 4 is cylindrical with a central through hole, the diameter of which matches the pin, and the outer diameter of the retaining ring 4 matches the inner diameter of the torsion spring 5. It is installed in a rectangular groove by a pin, and the torsion spring 5 is fitted onto it, which serves to fix and limit the torsion spring 5.

[0030] In this disclosure, the torsion spring 5 includes an end of a mounting ring structure and spring plates 51 extending along the tangential direction of the mounting ring. The torsion spring 5 is sleeved on the fixing ring 4, and the opening angle of its two spring plates 51 is greater than the maximum limiting opening angle of the pawl 3, and is embedded in the wing 31 of the pawl 3.

[0031] In this disclosure, the chuck 3 includes a mounting ring fixed to the second mounting hole 24 and a wing 31 extending along the tangential direction of the mounting ring. For example, a recessed hook 32 is provided at the end of the wing 31, and the end of the hook 32 has a serrated edge. For example, a limiting protrusion 33 is provided on the edge of the mounting ring. For example, the mounting ring is perpendicular to the connecting surface of the wing 31, and the thickness of the mounting ring is half the width of the wing 31. The head of the claw 3 is nearly circular, and a protrusion, namely the limiting protrusion 33, is provided at the top. Its function is to limit the claw 3 when the two claws 3 are opened to a certain angle, so that the protrusion part hits the wing 31 on the other claw 3. A pin hole is provided in the middle of the head for installing the claw 3 into the rectangular groove of the fixed body 2. The thickness of the circular head is half the width of the wing 31 so that they can be installed in pairs in the rectangular groove. The width of the wing 31 is slightly smaller than the width of the rectangular groove. The tail of the wing is provided with an arc-shaped claw, namely the hook 32, which faces outward. Multiple claw teeth, namely the serrated edge, are provided on the width of the wing 31 so that multiple claw teeth can be embedded into the hole wall after the claw 3 is opened to increase the embedding firmness. A rectangular groove is provided on the inner side of the wing 31 for limiting the spring 51.

[0032] In this disclosure, the mounting end of the fixed body 2 and the guide head 1 is a male connector 21, and the other end is a female connector 22. The front part of the guide head 1 is hemispherical, which guides the screen pipe within the drill pipe channel during conveying, preventing it from getting stuck when encountering steps in the drill pipe channel. The rear part is a female connector that connects to the male connector 21 at the front of the fixed body 2. In this way, after removing the guide head 1, the head of the device can be connected to the tail of the previous device for series use. The head of the fixed body 2 is a male connector 21, and the tail is a female connector 22, which can realize the series connection of multiple sets of devices. A strip-shaped rectangular groove is opened in the middle part to accommodate the claw 3. Two through pin holes are arranged at 90° phase with the rectangular groove near the head direction for installing the fixed claw 3 and the torsion spring 5.

[0033] In this disclosure, a rectangular slot is provided in the middle of the fixed body 2 to accommodate the claw 3. A second mounting hole 24 and a first mounting hole 23 are arranged in the rectangular slot at a 90° phase with the guide head 1. A pin is provided in the first mounting hole 23 and the second mounting hole 24 to install the torsion spring 5 and the claw 3. There are two claws 3. The second mounting hole 24 is used to install the claw 3. The torsion spring 5 is sleeved on the fixing ring 4. The fixing ring 4 is installed in the fixed body 2 through the first mounting hole 23. The two torsion springs 5 ​​are respectively placed in the two claws 3.

[0034] During operation, the assembled fixing device is connected to the screen tube string and continuously transported from the drill rod to the bottom of the hole. During the transport, the chuck 3 compresses the torsion spring 5 under the limit of the drilling channel and retracts into the rectangular groove. After passing through the openable drill bit, the chuck 3 opens under the elastic force of the torsion spring 5. The hook 32 at the tail end of the wing 31 makes it easy for the chuck 3 to smoothly embed the claw teeth into the hole wall even when it is opened at a small angle. At this time, the drill rod is lifted out. Under the action of the friction of the drill rod, the screen tube is dragged out of the hole by the dragging force, which pulls the fixing device to further secure the claw teeth, thus completing the fixing of the screen tube inside the hole.

[0035] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A downhole screen anchoring device for use in coal drilling, characterized in that, Set a fixed body (2); One end of the fixed body (2) is connected to the guide head (1). The fixed body (2) is a tube structure. The side wall opening of the fixed body (2) is fitted with a claw (3). A torsion spring (5) is pressed down on the claw (3). The fixed body (2) is provided with a first mounting hole (23) and a second mounting hole (24) at intervals near the end of the guide head (1); the first mounting hole (23) and the second mounting hole (24) are both mounting holes symmetrically arranged on the side wall of the fixed body (2), the second mounting hole (24) is used to fix the mounting claw (3), and the first mounting hole (23) is used to fix the torsion spring (5); A retaining ring (4) is also installed on the second mounting hole (24), and a torsion spring (5) is set on the retaining ring (4); The torsion spring (5) includes the end of the mounting ring structure and a spring leaf (51) extending along the tangent direction of the mounting ring. The claw (3) includes a mounting ring fixed on the second mounting hole (24) and a wing (31) extending along the tangential direction of the mounting ring; A recessed hook (32) is also provided at the end of the wing (31), and the end of the hook (32) is provided with a serrated edge; A limiting protrusion (33) is provided on the edge of the mounting ring; The mounting ring is perpendicular to the connecting surface of the winglet (31), and the thickness of the mounting ring is half the width of the winglet (31).

2. The in-hole screen anchoring device for coal drilling according to claim 1, characterized in that, The mounting end of the fixed body (2) and the guide head (1) is a male connector (21), and the other end is a female connector (22).

3. A downhole screen anchoring device for use in coal drilling according to claim 1 or 2, characterised in that, The fixed body (2) has a rectangular groove in the middle to accommodate the claw (3). A second mounting hole (24) and a first mounting hole (23) are arranged in the direction of the rectangular groove at a phase of 90° close to the guide head (1). A pin is provided in the first mounting hole (23) and the second mounting hole (24) to install the torsion spring (5) and the claw (3). There are two claws (3). The second mounting hole (24) is used to install the claw (3). The torsion spring (5) is sleeved on the fixing ring (4). The fixing ring (4) is installed in the fixing body (2) through the first mounting hole (23). The two torsion springs (5) are respectively placed in the two claws (3).

Images