A coal mine gas extraction hole drill bit

Abstract

This utility model relates to the field of drill bit technology and discloses a drill bit for coal mine gas extraction holes, including a drill rod and a connecting block. An installation mechanism is provided on both sides of the connecting block. The installation mechanism includes two limiting blocks. A cavity is formed on the inner wall of each limiting block away from the center of the connecting block. A threaded rod is rotatably connected to the inner wall of each cavity near the center of the connecting block. A threaded sleeve is fitted on the outer wall of each threaded rod. Two connecting rods are fixedly connected to the outer wall of each threaded sleeve near the center of the connecting block. A protrusion is fixedly connected to the outer wall of each adjacent connecting rod near the center of the connecting block. In this utility model, the threaded rod and threaded sleeve cooperate to drive the connecting rod and protrusion to retract synchronously, disengaging them from the clamping block. Subsequently, a return spring automatically pushes the clamping block back, quickly releasing it from the slot. The connection between the drill bit and the drill rod then separates, shortening drilling rig downtime and improving downhole operation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a drill bit for coal mine gas extraction holes. Background Technology

[0002] Coal mine gas drainage boreholes are key equipment in the modern coal mine safety production and resource efficiency utilization technology system. Their emergence and development are closely linked to the deepening understanding of coal mine gas hazards and the advancement of control technologies. In the early days, coal mine gas was considered a pure safety threat, and control methods were relatively crude, mainly relying on ventilation and dilution. With the increase in mining depth and intensity, the gas emission volume has increased dramatically, and traditional ventilation methods are no longer sufficient to meet safety requirements. Pre-drainage of coal seam gas has become a fundamental measure to ensure safe production. Against this backdrop, gas drainage borehole technology has emerged.

[0003] Traditional drill bits are usually welded as a whole. Disassembly requires the use of strong methods such as cutting and hammering, which is complicated, consumes a lot of downtime, and affects the continuity and overall efficiency of drilling operations.

[0004] Therefore, those skilled in the art have provided a coal mine gas drainage hole drill bit to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a coal mine gas extraction hole drill bit. Through the cooperation of the threaded rod and the threaded sleeve, the connecting rod and the protrusion move backward synchronously, so that they are freed from the squeezing of the jamming block. Then, the return spring automatically pushes the jamming block back and quickly disengages from the jamming slot. The connection between the drill bit and the drill rod is then separated, which shortens the drilling rig downtime and improves the efficiency of underground operations.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A coal mine gas extraction hole drill bit includes a drill rod and a connecting block. The connecting block has an installation mechanism on both sides. Each installation mechanism includes two limiting blocks. A cavity is formed on the inner wall of each limiting block away from the center of the connecting block. A threaded rod is rotatably connected to the inner wall of each cavity near the center of the connecting block. A threaded sleeve is fitted onto the outer wall of each threaded rod. Two connecting rods are fixedly connected to the inner wall of each threaded sleeve near the center of the connecting block. A protrusion is fixedly connected to the inner wall of each adjacent connecting rod near the center of the connecting block. A rotating block is fixedly connected to the inner wall of each threaded rod away from the center of the connecting block. A groove is formed on the inner wall of each limiting block near the center of the connecting block. Sliding grooves are formed at both ends of the inner wall of each groove. Two sliding blocks are slidably connected to the inner wall of each sliding groove. A locking block is fixedly connected to each adjacent sliding block. A return spring is fixedly connected to both ends of each adjacent locking block. Locking slots are formed on both sides of the connecting block.

[0008] The above technical solution uses the engagement of the threaded rod and the threaded sleeve to move the connecting rod and the protrusion, causing the protrusion to move away from the locking block. Then, with the help of the return spring, the locking block retracts and disengages from the slot, thereby quickly releasing the locking connection between the drill bit and the drill pipe. The entire disassembly process requires no additional tools, is simple and quick to operate, shortens the downtime of the drilling rig, and improves the overall efficiency of downhole operations.

[0009] Furthermore, a slot is provided at the upper end of the inner wall of the drill rod, and filter screens are provided on both sides of the lower end of the inner wall of the slot. A connecting pipe is connected through the other side of the upper end of the drill rod.

[0010] The above technical solutions reduce the difficulty and labor intensity of docking and improve the standardization of operations.

[0011] Furthermore, a drill bit is fixedly connected to the lower end of the connecting block;

[0012] The above technical solution ensures the reliability and integrity of force transmission between the drill bit and the connecting block.

[0013] Furthermore, all of the aforementioned card blocks engage with the card slots;

[0014] The above technical solution has extremely high mechanical strength and reliability, and can withstand severe vibration and impact loads during drilling operations, preventing the major safety risk of the drill bit falling out of the hole.

[0015] Furthermore, the side of each adjacent connecting rod near the center of the connecting block extends through the cavity to the outside of the cavity;

[0016] The above technical solution ensures that the thrust generated by the internal thread transmission can be converted into a lateral clamping force on the block, thereby improving the transmission efficiency and response accuracy of the mechanism.

[0017] Furthermore, both of the limiting blocks have their sides near the center of the connecting block extending through the drill rod and the slot into the slot;

[0018] The above technical solution simplifies the operation steps and ensures that the locking force can be applied directly and stably to the connecting block through the limit block.

[0019] Furthermore, the outer wall of the connecting block is fitted to the lower end of the drill rod;

[0020] The above technical solutions reduce vibration gaps and enhance the overall rigidity of the connection.

[0021] Furthermore, both threaded sleeves are threadedly connected to the threaded rod, and the side of each of the two rotating blocks near the center of the connecting block is slidably connected to the inner wall of the limiting block.

[0022] Through the above technical solutions, the threaded connection can ensure that the locked state will not loosen on its own under vibration, and the rotating block ensures that the rotation action can effectively drive the threaded rod.

[0023] This utility model has the following beneficial effects:

[0024] This utility model proposes a coal mine gas extraction hole drill bit, which uses the cooperation of a threaded rod and a threaded sleeve to drive the connecting rod and the protrusion to move the protrusion away from the locking block. Then, with the cooperation of a return spring, the locking block retracts and disengages from the slot, thereby quickly releasing the locking connection between the drill bit and the drill rod. The entire disassembly process requires no additional tools, is simple and quick to operate, shortens the downtime of the drilling rig, and improves the overall efficiency of underground operations. Attached Figure Description

[0025] Figure 1 This is an isometric view of a coal mine gas extraction hole drill bit proposed in this utility model;

[0026] Figure 2 An exploded view of a coal mine gas extraction hole drill bit proposed in this utility model;

[0027] Figure 3 This is a partial structural diagram of a coal mine gas extraction hole drill bit proposed in this utility model;

[0028] Figure 4 This is a partial exploded view of the structure of a coal mine gas extraction hole drill bit proposed in this utility model;

[0029] Figure 5 This is a front sectional view of a coal mine gas extraction hole drill bit proposed in this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Mounting mechanism; 101. Limiting block; 102. Cavity; 103. Threaded rod; 104. Threaded sleeve; 105. Connecting rod; 106. Protrusion; 107. Rotating block; 108. Groove; 109. Slide groove; 110. Sliding block; 111. Locking block; 112. Return spring; 113. Locking slot;

[0032] 2. Drill rod; 3. Drill bit; 4. Connecting block; 5. Filter screen; 6. Connecting pipe; 7. Empty slot. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides a specific implementation method:

[0035] A coal mine gas extraction hole drill bit includes a drill rod 2 and a connecting block 4. An installation mechanism 1 is provided on both sides of the connecting block 4. The installation mechanism 1 includes two limiting blocks 101. A cavity 102 is formed on the inner wall of each limiting block 101 away from the center of the connecting block 4. A threaded rod 103 is rotatably connected to the side of each cavity 102 near the center of the connecting block 4. A threaded sleeve 104 is fitted onto the outer wall of each threaded rod 103. Two connecting rods 105 are fixedly connected to the side of each threaded sleeve 104 near the center of the connecting block 4. Adjacent connecting rods 105 are close to the connecting block. A protrusion 106 is fixedly connected to one side of the center of the connecting block 4. A rotating block 107 is fixedly connected to one side of the two threaded rods 103 away from the center of the connecting block 4. A groove 108 is opened on one side of the two limit blocks 101 near the center of the connecting block 4. A sliding groove 109 is opened at both ends of the middle part of the inner wall of the two grooves 108. Two sliding blocks 110 are slidably connected to the inner wall of the multiple sliding grooves 109. A locking block 111 is fixedly connected to each adjacent sliding block 110. A return spring 112 is fixedly connected to both ends of the adjacent locking block 111. A locking groove 113 is opened on both sides of the connecting block 4.

[0036] The threaded rod 103 and the threaded sleeve 104 work together to move the connecting rod 105 and the protrusion 106, causing the protrusion 106 to move away from the locking block 111. Then, with the help of the return spring 112, the locking block 111 retracts and disengages from the slot 113, thereby quickly releasing the locking connection between the drill bit 3 and the drill pipe 2. The entire disassembly process requires no additional tools, is simple and quick to operate, shortens the downtime of the drilling rig, and improves the overall efficiency of downhole operations.

[0037] Reference Figure 3 , Figure 4 and Figure 5 The upper end of the inner wall of the drill rod 2 is provided with a slot 7, and the two sides of the lower end of the inner wall of the slot 7 are provided with filter screens 5. The other side of the upper end of the drill rod 2 is connected to a connecting pipe 6. The connecting pipe 6 reduces the difficulty of docking and the labor intensity, and improves the standardization of the operation. The lower end of the connecting block 4 is fixedly connected to the drill bit 3, which ensures the reliability and integrity of the force transmission between the drill bit 3 and the connecting block 4. Multiple locking blocks 111 are engaged with the locking slots 113, which have extremely high mechanical strength and reliability, and can withstand the severe vibration and impact loads during drilling operations, preventing the major safety risk of the drill bit 3 falling out of the hole. The side of the adjacent connecting rod 105 near the center of the connecting block 4 passes through the cavity 102 to the outside of the cavity 102.

[0038] This ensures that the thrust generated by the internal threaded transmission can be converted into a lateral clamping force on the locking block 111, improving the transmission efficiency and response accuracy of the mechanism. The two limiting blocks 101, on the side near the center of the connecting block 4, penetrate through the drill rod 2 and the slot 113 to the inside of the slot 113, simplifying the operation steps and ensuring that the locking force can be directly and stably applied to the connecting block 4 through the limiting blocks 101. The outer wall of the connecting block 4 fits against the lower end of the drill rod 2, reducing the vibration gap and enhancing the overall rigidity of the connection. The two threaded sleeves 104 are threadedly connected to the threaded rod 103. The two rotating blocks 107, on the side near the center of the connecting block 4, are slidably connected to the inner wall of the limiting block 101. The threaded connection ensures that the locked state will not loosen on its own under vibration, and the rotating blocks 107 ensure that the rotation action can effectively drive the threaded rod 103.

[0039] Working principle: The operator first aligns the connecting block 4 of the drill bit 3 with and inserts it into the interface at the lower end of the drill rod 2. Then, the limiting rod passes through the drill rod 2 and into the slot 113. Next, the operator rotates the rotating blocks 107 on both sides. The rotating blocks 107 drive the threaded rod 103 to rotate. Since the threaded sleeve 104 is threadedly connected to the threaded rod 103, the rotational motion is converted into linear motion of the threaded sleeve 104. The threaded sleeve 104 moves towards the center of the connecting block 4, pushing the protrusion 106 through the connecting rod 105. The protrusion 106 then presses against the locking block 111 for sliding. It will slide into the slot 113 to form a lock, making the drill bit 3 and the drill rod 2 form a rigid integrated connection, which is sufficient to withstand the severe torque and vibration during drilling. When disassembly is required, the rotating block 107 is rotated in the opposite direction to move the threaded sleeve 104 outward. The pressure of the protrusion 106 on the locking block 111 is released. Under the elastic force of the return spring 112 or the action of a slight external force, the locking block 111 is removed from the slot 113. Then the limiting block 101 is taken out from the inside of the drill rod 2, and the drill bit 3 can be separated from the drill rod 2. The operator can then directly remove the old drill bit 3 and install the new drill bit 3.

[0040] The following points should be noted in this article:

[0041] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coal mine gas extraction hole drill bit, comprising a drill rod (2) and a connecting block (4), characterized in that: The connecting block (4) is provided with mounting mechanisms (1) on both sides; The installation mechanism (1) includes two limiting blocks (101). A cavity (102) is provided on the inner wall of each limiting block (101) away from the center of the connecting block (4). A threaded rod (103) is rotatably connected to the inner wall of each cavity (102) near the center of the connecting block (4). A threaded sleeve (104) is fitted onto the outer wall of each threaded rod (103). Two connecting rods (105) are fixedly connected to the inner wall of each threaded sleeve (104) near the center of the connecting block (4). A protrusion (106) is fixedly connected to the inner wall of each adjacent connecting rod (105) near the center of the connecting block (4). Each of the threaded rods (103) is fixedly connected to a rotating block (107) on the side away from the center of the connecting block (4). Each of the two limiting blocks (101) is provided with a groove (108) on the side near the center of the connecting block (4). Each of the two grooves (108) is provided with a sliding groove (109) at both ends of the inner wall of the inner wall of the two grooves (108). Each of the sliding grooves (109) is slidably connected to two sliding blocks (110). Each of the adjacent sliding blocks (110) is fixedly connected with a locking block (111). Each of the adjacent locking blocks (111) is fixedly connected with a return spring (112) at both ends. Each of the connecting blocks (4) is provided with a locking groove (113) on both sides.

2. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: The upper end of the inner wall of the drill rod (2) is provided with a slot (7), and the two sides of the lower end of the inner wall of the slot (7) are provided with filter screens (5). The other side of the upper end of the drill rod (2) is connected to a connecting pipe (6).

3. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: The lower end of the connecting block (4) is fixedly connected to a drill bit (3).

4. A coal mine gas extraction hole drill bit according to claim 1, characterized in that: All of the aforementioned card blocks (111) engage with the card slots (113).

5. A coal mine gas extraction hole drill bit according to claim 1, characterized in that: The side of the adjacent connecting rod (105) near the center of the connecting block (4) all penetrates through the cavity (102) to the outside of the cavity (102).

6. A coal mine gas extraction hole drill bit according to claim 1, characterized in that: Both of the limiting blocks (101) have one side near the center of the connecting block (4) that penetrates the drill rod (2) and the slot (113) into the slot (113).

7. A coal mine gas extraction hole drill bit according to claim 1, characterized in that: The outer wall of the connecting block (4) is attached to the lower end of the drill rod (2).

8. A coal mine gas extraction hole drill bit according to claim 1, characterized in that: Both of the threaded sleeves (104) are threadedly connected to the threaded rod (103), and the two rotating blocks (107) are slidably connected to the inner wall of the limiting block (101) on the side near the center of the connecting block (4).

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