Drill bit jam releasing structure

Abstract

The invention belongs to a drill bit for coal mine well drilling, and particularly relates to a drill bit jam releasing structure which comprises a drill rod. The drill bit is connected with the drill rod; the drill bit comprises a connecting section and a cutting section; the outer diameter of the connecting section is consistent with that of the drill rod; the connecting section and the cutting section are clamped through a limiting mechanism; under the conditions of drill jamming and drill burying accidents in drilling construction under a mine, if a drill rod is not completely jammed but a drill bit is jammed by resistance, under the condition that the drill rod can rotate or the rotation pressure is large, the limiting mechanism is started through the controller, the limiting mechanism drives the positioning pin to displace and be gradually separated from the pin groove, and the drill rod is locked. After the positioning pin is completely separated from the pin groove, the drilling rod is forcefully pulled through drilling equipment, so that the drilling rod and the connecting section are smoothly withdrawn from the mine; it is guaranteed that the drill rod can still retreat from a mine smoothly even if the drill rod can still rotate or the drill rod is not completely clamped due to the fact that the drill bit is blocked and clamped.

Description

Technical Field

[0001] This invention pertains to drill bits for coal mine drilling, specifically a drill bit unblocking structure. Background Technology

[0002] In coal mine drilling, the drill bit is the primary tool for breaking rocks, and the wellbore is formed by the drill bit breaking the rocks. Driven by machinery, the drill bit rotates, causing the entire bit to move centripetally. Through cutting and grinding, it cracks and breaks the rock, thus achieving the purpose of drilling downwards. The drill bit is one of the main drilling equipment. Depending on the working environment and geographical location, the specifications and shape of the drill bit should vary. In oil drilling operations, the drill bit should be selected rationally and scientifically based on specific needs and design schemes.

[0003] However, the above-mentioned technologies often have the following defects. When encountering drill jamming or drill burial accidents during underground drilling in coal mines, the drill rod is often not completely stuck, but the drill bit is blocked and stuck, which means that even if the drill rod can rotate or the rotation pressure is high, the drill rod cannot be smoothly removed. Therefore, a drill bit unblocking structure is proposed to address the above problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem mentioned in the background art has been solved.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a drill bit unblocking structure, including a drill rod; and a drill bit connected to the drill rod; the drill bit includes a connecting section and a cutting section; the outer diameter of the connecting section is the same as the outer diameter of the drill rod.

[0006] The cutting section has a slot that matches the outer diameter of the connecting section. The bottom of the connecting section is fixedly connected to a snap-fit ​​key. The cutting section has a keyway that matches the snap-fit ​​key. Multiple snap-fit ​​keys and keyways are provided and are arranged in a one-to-one correspondence. The snap-fit ​​keys and keyways are arranged in a circumferential array. The connection between the snap-fit ​​key and the keyway is similar to gear meshing and can transmit rotational torque.

[0007] The connecting section and the cutting section are engaged by a limiting mechanism;

[0008] The limiting mechanism is connected to a positioning pin. The connecting section has a through hole for the positioning pin to pass through, and the cutting section has a pin groove that engages with the positioning pin.

[0009] In the event of a stuck drill or buried drill bit during underground drilling operations, if the drill rod is not completely stuck but the drill bit is obstructed, and the drill rod can still rotate or the rotational pressure is high, the limit mechanism is activated by the controller. The limit mechanism drives the positioning pin to move and gradually separate from the pin groove until the positioning pin is completely separated from the pin groove. Then, the drilling equipment is used to forcefully pull up the drill rod, allowing the drill rod and connecting section to be smoothly removed from the mine. This ensures that even if the drill rod can still rotate or the rotational pressure is high and it is not completely stuck due to the drill bit being obstructed, the drill rod can still be smoothly removed from the mine.

[0010] Preferably, the limiting mechanism includes a mounting groove formed in the connecting section, a motor connected to the connecting section is disposed inside the mounting groove, a bidirectional lead screw is connected to the output end of the motor, a bearing adapted to the bidirectional lead screw is connected to the connecting section, nuts are symmetrically connected to the bidirectional lead screw, a positioning pin is connected to the bottom of the nut, and a sealing sleeve is provided between the through hole and the pin groove, the sealing sleeve being made of rubber; the motor is electrically connected to the controller, and during the separation operation, the controller starts the motor to rotate, which in turn drives the bidirectional lead screw to cause the two nuts to move towards each other, and during the process of the two nuts moving towards each other, the positioning pin is driven to separate from the pin groove; the rubber sealing sleeve facilitates a tighter connection and prevents the positioning pin from shaking.

[0011] Preferably, the jetting mechanism includes a delivery pipe extending through the drill pipe, the connecting section, and into the slot. The cutting section is connected to a connecting pipe, and the output end of the connecting pipe is connected to a high-pressure nozzle. The jetting end of the high-pressure nozzle faces outward from the cutting section. The input end of the connecting pipe is engaged with the output end of the delivery pipe. The delivery pipe is connected to a booster pump, and liquid is introduced into the delivery pipe through an external pipeline. During underground drilling, the liquid enters the delivery pipe, is pressurized by the booster pump, flows into the connecting pipe, and is finally jetted into the mine through the high-pressure nozzle. The high-pressure jetting liquid has an impact effect; this jet can directly impact, tear, and break the rock, complementing the mechanical breaking action of the cutting section and improving breaking efficiency. Furthermore, the high-pressure jetting liquid can impact and lift some of the broken rock, preventing the broken rock from depositing outside the cutting section and reducing the risk of stuck drill bit accidents.

[0012] The liquid is a cutting fluid with lubricating, cooling and rust-preventing properties; it facilitates improved lubrication during underground drilling operations, while also enhancing the cooling effect and rust prevention of the cutting section.

[0013] The bottom outer side of the delivery pipe and the top inner side of the connecting pipe are both V-shaped, and a sealing ring is provided between the delivery pipe and the connecting pipe; this facilitates insertion and effectively ensures sealing performance, preventing leakage when liquid flows from the delivery pipe into the connecting pipe.

[0014] Preferably, the atomizing spray mechanism is provided in two sets and symmetrically arranged above and below the bidirectional lead screw. The atomizing spray mechanism includes a transfer pipe connected to the conveying pipe, the transfer pipe is connected to a spray pipe, and the spray pipe is connected to an atomizing nozzle. In the dark and humid environment of the mine, in order to avoid the outer surface of the bidirectional lead screw from rusting and affecting the movement of the nut, if the liquid is a cutting fluid with anti-rust function, it flows into the transfer pipe and the spray pipe through the conveying pipe, and then is atomized and sprayed towards the bidirectional lead screw through the atomizing nozzle, so as to avoid the nut movement being affected by the outer surface of the bidirectional lead screw from rusting.

[0015] The mounting groove is equipped with a collection plate that is sealed to the inner wall of the connecting section. The collection plate is funnel-shaped and connected to a recovery pipe. The recovery pipe is connected to a solenoid valve, and the output end of the recovery pipe is connected to the inside of the delivery pipe. The solenoid valve is electrically connected to the controller. Part of the cutting fluid sprayed through the atomizing nozzle adheres to the outer surface of the bidirectional lead screw, while the remaining scattered cutting fluid gradually falls onto the upper surface of the collection plate and then flows into the recovery pipe. By opening the solenoid valve, the cutting fluid flowing into the recovery pipe is allowed to merge into the delivery pipe for reuse, thus avoiding resource waste.

[0016] Preferably, multiple clearance grooves are provided between the drill rod and the connecting section, and a connecting plate is bolted into the clearance groove; this facilitates further strengthening of the connection between the drill rod and the connecting section, while avoiding increasing the outer diameter of the drill rod and the connecting section.

[0017] Preferably, the drill bit is a directional drill bit;

[0018] Preferably, the drill bit is a milling drill bit;

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The drill bit unblocking structure of the present invention uses a controller to activate a limiting mechanism to drive the positioning pin to move and gradually separate from the pin groove until the positioning pin is completely separated from the pin groove. Then, the drill rod is forcefully pulled out by the drilling equipment, so that the drill rod and the connecting section can be smoothly withdrawn from the mine. This ensures that even if the drill bit is blocked and stuck, but the drill rod can still rotate, or if the rotation pressure is high and it is not completely stuck, the drill rod can still be smoothly withdrawn from the mine.

[0021] 2. The drill bit unjamming structure of the present invention delivers cutting fluid into a transfer pipe and a spray pipe through a delivery pipe, and then sprays it onto the bidirectional lead screw through an atomizing nozzle, so as to avoid the nut movement being affected by the corrosion of the outer surface of the bidirectional lead screw. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a cross-sectional view of the storage plate in this invention;

[0025] Figure 3 This is a cross-sectional view of the drill pipe in this invention;

[0026] Figure 4 This is a cross-sectional view of the injection mechanism in this invention;

[0027] Figure 5 This is the present invention. Figure 4 Enlarged view of the structure at point A in the middle;

[0028] Figure 6 This is a three-dimensional structural diagram of the spraying mechanism and the atomizing spraying mechanism in this invention;

[0029] Figure 7 This is a three-dimensional structural diagram of the drill pipe and connecting section in this invention;

[0030] Figure 8 This is a top view of the cutting section in this invention.

[0031] In the diagram: 1. Drill rod; 2. Connecting section; 3. Cutting section; 41. Delivery pipe; 42. Connecting pipe; 43. High-pressure nozzle; 44. Booster pump; 45. Sealing ring; 5. Snap-fit ​​key; 6. Snap-fit ​​groove; 7. Keyway; 81. Motor; 82. Bearing; 83. Double-acting screw; 84. Positioning pin; 85. Sealing sleeve; 86. Through hole; 87. Pin groove; 88. Nut; 91. Transfer pipe; 92. Spray pipe; 93. Atomizing nozzle; 94. Collection plate; 95. Recovery pipe; 96. Solenoid valve; 10. Clearance groove; 11. Connecting plate; 12. Bolt; 20. Mounting groove; 21. Liquid. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] like Figures 1 to 8 As shown in the embodiment of the present invention, a drill bit unjamming structure includes a drill rod 1; a drill bit connected to the drill rod 1; the drill bit includes a connecting section 2 and a cutting section 3; the outer diameter of the connecting section 2 is the same as the outer diameter of the drill rod 1; the cutting section 3 has a slot 6 that matches the outer diameter of the connecting section 2; a snap-fit ​​key 5 is fixedly connected to the bottom of the connecting section 2; the cutting section 3 has a keyway 7 that matches the snap-fit ​​key 5; multiple snap-fit ​​keys 5 and keyways 7 are provided and are arranged in a one-to-one correspondence; the snap-fit ​​keys 5 and keyways 7 are arranged in a circumferential array; the connection between the snap-fit ​​key 5 and the keyway 7 is similar to gear meshing and can transmit rotational torque;

[0034] Connecting section 2 and cutting section 3 are engaged by a limiting mechanism;

[0035] The limiting mechanism is connected to a positioning pin 84. The connecting section 2 has a through hole 86 for the positioning pin 84 to pass through, and the cutting section 3 has a pin groove 87 that engages with the positioning pin 84.

[0036] When encountering stuck or buried drill accidents during underground drilling operations, if drill rod 1 is not completely stuck but the drill bit is obstructed and stuck, and drill rod 1 can rotate or the rotational pressure is high, the limit mechanism is activated by the controller (a known prior art, not shown in the figure). The limit mechanism drives the positioning pin 84 to move and gradually separate it from the pin groove 87 until the positioning pin 84 is completely separated from the pin groove 87. Then, the drilling equipment (a known prior art, not shown in the figure) is used to forcefully pull out drill rod 1, so that drill rod 1 and connecting section 2 can be smoothly withdrawn from the mine. This ensures that even if the drill bit is obstructed and stuck, but drill rod 1 can still rotate or the rotational pressure is high and it is not completely stuck, drill rod 1 can still be smoothly withdrawn from the mine.

[0037] Furthermore, the limiting mechanism includes a mounting groove 20 formed in the connecting section 2. A motor 81 connected to the connecting section 2 is installed inside the mounting groove 20. A bidirectional lead screw 83 is connected to the output end of the motor 81. A bearing 82 adapted to the bidirectional lead screw 83 is connected to the connecting section 2. Nuts 88 are symmetrically connected to the bidirectional lead screw 83. A positioning pin 84 is connected to the bottom of each nut 88. A sealing sleeve 85, made of rubber, is provided between the through hole 86 and the pin groove 87. The motor 81 is electrically connected to a controller (a known technology, not shown in the figure). During the separation operation, the controller starts the motor 81, which in turn drives the bidirectional lead screw 83, causing the two nuts 88 to move towards each other. During this movement, the positioning pin 84 separates from the pin groove 87. The rubber sealing sleeve 85 facilitates a tighter connection and prevents the positioning pin 84 from shaking.

[0038] Furthermore, the jetting mechanism includes a conveying pipe 41 that runs through the drill pipe 1, connecting section 2, and into the slot 6. A connecting pipe 42 connects to the cutting section 3, and a high-pressure nozzle 43 is connected to the output end of the connecting pipe 42. The jetting end of the high-pressure nozzle 43 faces outwards from the cutting section 3. The input end of the connecting pipe 42 is connected to the output end of the conveying pipe 41. A booster pump 44 connects to the conveying pipe 41, and liquid 21 is input through an external pipe at the input end of the conveying pipe 41. During underground drilling, liquid 21 enters the conveying pipe 41, is pressurized by the booster pump 44, flows into the connecting pipe 42, and is finally jetted into the mine through the high-pressure nozzle 43. The high-pressure jetting liquid 21 has an impact effect; this jet can directly impact, tear, and break the rock, complementing the mechanical breaking action of the cutting section 3 and improving breaking efficiency. Furthermore, the high-pressure jetting liquid 21 can impact and lift some of the broken rock, preventing it from depositing outside the cutting section 3 and reducing the risk of stuck drill bits.

[0039] Liquid 21 is a cutting fluid with lubricating, cooling and rust-preventing properties; it facilitates improved lubrication during underground drilling operations and enhances the cooling and rust-preventing performance of the cutting section 3.

[0040] The bottom outer side of the conveying pipe 41 and the top inner side of the connecting pipe 42 are both V-shaped. A sealing ring 45 is provided between the conveying pipe 41 and the connecting pipe 42; this facilitates insertion and effectively ensures sealing performance, preventing leakage of liquid 21 when it flows from the conveying pipe 41 into the connecting pipe 42.

[0041] Furthermore, the atomizing spray mechanism is provided in two sets and symmetrically arranged above and below the bidirectional lead screw 83. The atomizing spray mechanism includes a transfer pipe 91 connected to the conveying pipe 41, a spray pipe 92 connected to the transfer pipe 91, and an atomizing nozzle 93 connected to the spray pipe 92. In the dark and humid environment of the mine, in order to avoid the outer surface of the bidirectional lead screw 83 from rusting and affecting the movement of the nut 88, when the liquid 21 is a cutting fluid with anti-rust function, it flows into the transfer pipe 91 and the spray pipe 92 through the conveying pipe 41, and then atomizes and sprays the liquid towards the bidirectional lead screw 83 through the atomizing nozzle 93, so as to avoid the nut 88 from being affected by the outer surface of the bidirectional lead screw 83 rusting.

[0042] The mounting slot 20 is equipped with a collection plate 94 that is sealed to the inner wall of the connecting section 2. The collection plate 94 is funnel-shaped and is connected to a recovery pipe 95. The recovery pipe 95 is connected to a solenoid valve 96, and the output end of the recovery pipe 95 is connected to the inside of the delivery pipe 41. The solenoid valve 96 is electrically connected to a controller (which is known technology and is not shown in the figure). Part of the cutting fluid sprayed by the atomizing nozzle 93 adheres to the outer surface of the bidirectional lead screw 83, while the remaining scattered cutting fluid gradually falls onto the upper surface of the collection plate 94 and then flows into the recovery pipe 95. By opening the solenoid valve 96, the cutting fluid flowing into the recovery pipe 95 is allowed to flow into the delivery pipe 41 for reuse, thus avoiding resource waste.

[0043] Furthermore, multiple clearance grooves 10 are provided between the drill rod 1 and the connecting section 2, and a connecting plate 11 is connected to the clearance groove 10 by bolts 12; this facilitates further strengthening of the connection between the drill rod 1 and the connecting section 2, while avoiding increasing the outer diameter of the drill rod 1 and the connecting section 2.

[0044] Furthermore, the drill bit is a directional drill bit. During directional drilling (conventional rotary) construction, in the event of a stuck drill or buried drill accident, if the drill rod 1 is not completely stuck, but the drill bit is obstructed and stuck, and the drill rod 1 can rotate, or the rotary pressure is high, the limit mechanism is activated by the controller (a known technology, not shown in the figure). The limit mechanism drives the positioning pin 84 to move and gradually separate from the pin groove 87 until the positioning pin 84 is completely separated from the pin groove 87. Then, the drill rod 1 is forcefully pulled out by the drilling equipment (a known technology, not shown in the figure), so that the drill rod 1 and the connecting section 2 can be smoothly withdrawn from the mine. This ensures that even if the drill bit is obstructed and stuck during directional drilling construction, but the drill rod 1 can still rotate, or the rotary pressure is high and it is not completely stuck, the drill rod 1 can still be smoothly withdrawn from the mine.

[0045] Furthermore, the drill bit is a milling drill bit; during the milling operation, in the event of a stuck drill or buried drill accident, if the drill rod 1 is not completely stuck, but the drill bit is obstructed and stuck, and the drill rod 1 can rotate, or the rotational pressure is high, the limit mechanism is activated by the controller (a known technology, not shown in the figure). The limit mechanism drives the positioning pin 84 to move and gradually separate from the pin groove 87 until the positioning pin 84 is completely separated from the pin groove 87. Then, the drill rod 1 is forcefully pulled out by the drilling equipment (a known technology, not shown in the figure), so that the drill rod 1 and the connecting section 2 can be smoothly withdrawn from the mine. This ensures that even if the drill bit is obstructed and stuck during the milling drilling operation, but the drill rod 1 can still rotate, or the rotational pressure is high and it is not completely stuck, the drill rod 1 can still be smoothly withdrawn from the mine.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drill bit un-sticking structure comprising a drill pipe (1) characterised in that: Also include the drill pipe (1) connected drill bit, drill bit includes connecting section (2) and cutting section (3), the connecting section (2) outer diameter and drill pipe (1) outer diameter consistent; The cutting section (3) is provided with a clamping groove (6) matched with the outer diameter of the connecting section (2), and the bottom of the connecting section (2) is fixedly connected with a clamping key (5), the cutting section (3) is provided with a key groove (7) matched with the clamping key (5), the clamping key (5) and the key groove (7) are provided with a plurality of and one-to-one corresponding setting, the clamping key (5) and the key groove (7) are distributed in the form of circumferential array; The connecting section (2) and the cutting section (3) are clamped by a limiting mechanism; The limiting mechanism is connected with a positioning pin (84), the connecting section (2) is provided with a through hole (86) for the positioning pin (84) to pass through, and the cutting section (3) is provided with a pin groove (87) for clamping the positioning pin (84).

2. The drill bit unjamming structure of claim 1, wherein: The limiting mechanism includes a mounting groove (20) provided in the connecting section (2), the mounting groove (20) is provided with a motor (81) connected with the connecting section (2) in the inside, the output end of the motor (81) is connected with a bidirectional screw rod (83), the connecting section (2) is connected with a bearing (82) matched with the bidirectional screw rod (83), the bidirectional screw rod (83) is symmetrically connected with a nut (88), the bottom of the nut (88) is connected with the positioning pin (84), the through hole (86) and the pin groove (87) are jointly provided with a sealing sleeve (85), and the sealing sleeve (85) is made of rubber material.

3. The drill bit unjamming structure of claim 2, wherein: The spraying mechanism includes a conveying pipe (41) penetrating through the drill pipe (1), the connecting section (2) and the clamping groove (6), the cutting section (3) is connected with a connecting pipe (42), the output end of the connecting pipe (42) is connected with a high-pressure nozzle (43), the spraying end of the high-pressure nozzle (43) faces the outside of the cutting section (3), the input end of the connecting pipe (42) is clamped with the output end of the conveying pipe (41), the conveying pipe (41) is connected with a booster pump (44), and the input end of the conveying pipe (41) is input with liquid (21) through an external pipeline.

4. The drill bit unjamming structure of claim 3, wherein: The liquid (21) is a cutting fluid, which has lubricating, cooling and rust-proof properties.

5. The drill bit unjamming structure of claim 4, wherein: The bottom outside of the conveying pipe (41) and the top inside of the connecting pipe (42) are both V-shaped, and a sealing ring (45) is arranged between the conveying pipe (41) and the connecting pipe (42).

6. The drill bit unjamming structure of claim 5, wherein: The atomizing spraying mechanism is provided with two groups and is symmetrically arranged above and below the bidirectional screw rod (83), the atomizing spraying mechanism includes a transfer pipe (91) connected with the conveying pipe (41), the transfer pipe (91) is connected with a spraying pipe (92), and the spraying pipe (92) is connected with an atomizing nozzle (93).

7. The drill bit unjamming structure of claim 6, wherein: The inside of the mounting groove (20) is provided with a storage plate (94) sealingly connected with the inner wall of the connecting section (2), the storage plate (94) is funnel-shaped, the storage plate (94) is connected with a recovery pipe (95), the recovery pipe (95) is connected with a solenoid valve (96), and the output end of the recovery pipe (95) is connected with the inside of the conveying pipe (41).

8. The drill bit unjamming structure of claim 7, wherein: A plurality of avoiding grooves (10) are formed between the drill rod (1) and the connecting section (2), and a connecting plate (11) is connected in the avoiding groove (10) by a bolt (12).

9. The drill bit unjamming structure of claim 8, wherein: The drill head is a directional drill head.

10. The drill bit unjamming structure of claim 8, wherein: The drill head is a casing drill head.

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