A directional drilling rig drill bit for rapid drilling assisted by ultrasonic vibration

Abstract

The invention discloses a directional drilling rig drill bit for ultrasonic vibration-assisted rapid drilling, comprising a drill bit body that can be screwed and fixed on the front end of a drill rod, the drill bit body being a hollow structure, the front end of the drill bit body being a multi-claw structure, and a drill tooth being installed on each claw tooth through a mounting seat; an ultrasonic actuator is provided inside the front end of the drill bit body, and the ultrasonic actuator has a radial extension portion embedded in the tooth grooves of adjacent claw teeth; the ultrasonic actuator is used to convert and amplify the ultrasonic signal generated by the ultrasonic generator through an energy converter and an amplitude converter, and then act on the rock mass; the ultrasonic generator, the energy converter and the amplitude converter are all arranged through the mounting hole in the middle of the drill bit body; and the ultrasonic generator is a rechargeable structure of a DC power supply, and has a remote control unit. The beneficial effects of the invention are that it has an ultrasonic-assisted cracking function; there is no need to set a power supply and a control line, the drilling process is safe, the hole-forming speed is fast, and the drilling efficiency is high, and it is particularly suitable for long-distance directional drilling in the coal mining industry.

Description

Technical Field

[0001] The invention relates to a hard rock directional drilling tool, in particular to a directional drilling rig drill bit for rapid drilling assisted by ultrasonic vibration. Background Art

[0002] At present, hydraulic fracturing technology in coal mines is a reliable and practical technology for mine gas control. Since ordinary hydraulic fracturing technology has the characteristics of large drilling volume and high cost, coal mines gradually introduced directional drilling rigs for large-diameter and long-distance drilling construction, and used them as fracturing holes for hydraulic fracturing, achieving a series of relatively good results. However, there are corresponding applicable conditions when using directional drilling rigs for long-distance directional drilling. It requires that the hardness of the coal rock layer should not be too small or too large. If the hardness is too small, the hole is easy to collapse during drilling. If the hardness is too large, the drilling and hole-forming speed is too slow and the efficiency is too low.

[0003] Studies have shown that under the action of high-frequency vibration, internal cracks in rocks are rapidly generated and expanded, and their strength is greatly reduced in a short period of time. The natural frequency of coal-bearing strata rocks is mostly between 20kHz and 50kHz, and the frequency range of ultrasound can just meet the frequency of rock resonance. Introducing ultrasound into engineering rock crushing for related conversion and application can increase the drilling speed of the drill bit and extend the service life of the drill bit.

[0004] Although ultrasonic-assisted rock breaking has been used in oil well drilling or tunnel excavation, it usually uses AC power from a wired power supply or has a self-generating structure. Since the power supply needs to be laid along the drill pipe, and the self-generating structure requires a large installation space, both are not suitable for long-distance drilling construction of directional drilling rigs in the coal mining industry. Therefore, it is urgent to develop a new type of drilling machine that can assist in drilling and forming holes for long-distance drilling construction of directional drilling rigs in the coal mining industry. Summary of the invention

[0005] The purpose of the present invention is to address the defect of slow hole-forming speed in long-distance directional drilling in the coal mining industry in the prior art, and to provide a directional drilling rig drill bit for rapid drilling assisted by ultrasonic vibration. The drill bit is combined with an ultrasonic component through a drill bit body to form a drill bit with ultrasonic-assisted cracking. The ultrasonic power supply is designed as a rechargeable DC power supply structure, and remote control is achieved by setting a remote control unit, thereby avoiding the laying of AC power lines and control signal lines along the drill rod, thereby ensuring a safe and smooth drilling process.

[0006] To achieve the aforementioned purpose, the present invention adopts the following scheme.

[0007] A directional drilling rig drill bit for ultrasonic vibration-assisted rapid drilling comprises a drill bit body that can be screwed and fixed on the front end of a drill rod, the drill bit body is a hollow structure, the front end of the drill bit body is a multi-claw structure, and a drill tooth is installed on each claw through a mounting seat; an ultrasonic actuator is provided inside the front end of the drill bit body, and the ultrasonic actuator has a radial extension portion embedded in the tooth grooves of adjacent claws; the ultrasonic actuator is used to convert and amplify the ultrasonic signal generated by the ultrasonic generator through an energy converter and an amplitude transformer, and then act on the rock mass; the ultrasonic generator, the energy converter and the amplitude transformer are all arranged through a mounting hole in the middle of the drill bit body; and the ultrasonic generator is a rechargeable structure of a DC power supply, and has a remote control unit, and the remote control unit is electrically connected to a remote signal receiving unit.

[0008] The present invention adopts the above technical solution, by combining the drill bit body with the ultrasonic component, a drill bit with ultrasonic assisted cracking is formed; and by designing the ultrasonic power supply as a rechargeable structure of a DC power supply, and by setting a remote control unit and a remote signal receiving unit, the remote signal receiving unit receives the remote control signal of the remote controller, so as to realize the remote control of the ultrasonic generator, avoid laying AC power lines and control signal lines along the drill rod, and ensure the safety and smoothness of the drilling process. It is particularly suitable for long-distance directional drilling in the coal mining industry, with fast hole-forming speed and high drilling efficiency.

[0009] Preferably, the ultrasonic generator includes a DC power supply and an inverter circuit, wherein the DC power supply is composed of a rechargeable battery with a charging interface, so as to realize energy replenishment by charging the rechargeable battery, wherein the inverter is used to convert the DC power of the rechargeable battery into AC power, and use this as the ultrasonic generating part to provide AC power of the corresponding frequency.

[0010] Preferably, the remote control unit has a frequency adjustment circuit and an on / off control circuit, so as to realize the frequency adjustment and on / off control management of remote control by utilizing the remote signal transmission technology in the prior art.

[0011] Preferably, the ultrasonic generator, energy converter and horn all have cylindrical shells, and the outer circumferential surfaces of the three cylindrical shells are circumferentially distributed with a plurality of axially straight or spirally extending heat dissipation fins, and air guide grooves are formed between adjacent heat dissipation fins; the drill body is formed with a slag blowing channel connected to the mounting hole, and the outlet of the slag blowing channel is located at the front end of the drill. The airflow of the slag blowing air is used to cool the battery, energy converter and horn, ensuring safety in use and extending the service life of the drill.

[0012] Preferably, the claw teeth of the drill body have a part of a slag blowing channel; or / and, the radial extension of the ultrasonic actuator has a part of a slag blowing channel. Slag can be discharged with the help of the drill body or / and, the ultrasonic actuator, and the drill body or / and, the ultrasonic actuator can be air-cooled at the same time, ensuring the safety of use and extending the service life of the drill bit.

[0013] Preferably, an annular groove is formed on the cylindrical shell, and the bottom diameter of the annular groove is smaller than the bottom diameter of the air guide groove, so as to form a vortex airflow by using the annular groove, increase the fan heat area, slow down the air flow speed, and enhance the air cooling effect.

[0014] Preferably, the ultrasonic actuator and the horn are screwed together, and the two are connected together by a screw hole and a stud forming a screwing relationship, so as to improve the convenience of disassembly and assembly.

[0015] The beneficial effects of the present invention are that a drill bit with ultrasonic-assisted cracking is formed by combining the drill bit body with the ultrasonic component; and by designing the ultrasonic power supply into a rechargeable DC power supply structure and providing a remote control unit to achieve remote control, thereby avoiding the laying of AC power lines and control signal lines along the drill rod, thereby ensuring a safe and smooth drilling process; the present invention is particularly suitable for long-distance directional drilling in the coal mining industry, with a fast hole-forming speed and high drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front end face structure of the drill bit of the present invention.

[0017] Figure 2 The present invention is Figure 1 AA section view in.

[0018] Figure 3 The present invention is Figure 1 BB section view in. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.

[0020] See also Figure 1 , Figure 2 , Figure 3A directional drilling rig drill bit for ultrasonic vibration-assisted rapid drilling, comprising a drill bit body 1 that can be screwed and fixed on the front end of a drill rod 7, the drill bit body 1 is a hollow structure, the front end of the drill bit body 1 is a multi-claw structure, and a drill tooth 2 is installed on each claw through a mounting seat 8; an ultrasonic actuator 3 is arranged inside the front end of the drill bit body 1, and the ultrasonic actuator 3 has a radial extension portion embedded in the tooth grooves of adjacent claws; the ultrasonic actuator 3 is used to convert and amplify the ultrasonic signal generated by the ultrasonic generator 4 through an energy converter 5 and an amplitude transformer 6, and then act on the rock mass; the ultrasonic The sonic generator 4, the energy converter 5 and the horn 6 are all arranged through the mounting hole in the middle of the drill body 1; and the ultrasonic generator 4 is a rechargeable structure of a DC power supply and has a remote control unit, and the remote control unit is connected to a remote signal receiving unit; the ultrasonic actuator 3 and the horn 6 are screwed together; wherein a screw hole is formed on the horn 6, and a stud that forms a screw relationship with the screw hole is formed on the ultrasonic actuator 3; the ultrasonic generator 4 and the energy converter 5 are connected by a wire 11, and the horn 6 is fixedly connected to the front end of the energy converter 5.

[0021] The ultrasonic generator 4 includes a DC power supply and an inverter circuit, and the DC power supply is composed of a rechargeable battery with a charging interface. The remote control unit has a frequency adjustment circuit and an on / off control circuit.

[0022] The ultrasonic generator 4, energy converter 5 and amplitude transformer 6 all have cylindrical shells, and multiple axially extending heat dissipation fins are circumferentially distributed on the outer circumferential surfaces of the three cylindrical shells, and air guide grooves 9 are formed between adjacent heat dissipation fins; and an annular groove is formed on the cylindrical shell, and the bottom diameter of the annular groove is smaller than the bottom diameter of the air guide groove 9; a slag blowing channel 10 connected to the mounting hole is formed on the drill body 1, and the outlet of the slag blowing channel 10 is located at the front end of the drill bit.

[0023] The claws of the drill body 1 and the radially extending portion of the ultrasonic actuator 3 are both provided with a portion of a slag blowing channel 10 .

[0024] In this embodiment, the slag blowing channel 10 may be provided on only one of the claws of the drill body 1 and the ultrasonic actuator 3 .

[0025] The heat-dissipating fins in this embodiment can extend axially in a straight line or in an axial spiral; the spiral extension can increase the heat-dissipating area, prolong the airflow retention time, and enhance the air-cooling effect.

[0026] The combination of the battery and the inverter in the ultrasonic generator of this embodiment is basically similar to the combination of the battery and the inverter of the new energy electric vehicle.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A directional drilling rig drill bit for rapid drilling assisted by ultrasonic vibration, characterized in that: The drill bit comprises a drill body (1) capable of being screwed and fixed on the front end of a drill rod, the drill body (1) being a hollow structure, the front end of the drill body (1) being a multi-claw structure, and a drill tooth (2) being detachably mounted on each claw tooth via a mounting seat; an ultrasonic actuator (3) is arranged inside the front end of the drill body (1), the ultrasonic actuator (3) having a radial extension portion embedded in the tooth grooves of adjacent claw teeth; the ultrasonic actuator (3) is used to convert and amplify an ultrasonic signal generated by an ultrasonic generator (4) through an energy converter (5) and an amplitude converter (6) and then act on the rock mass; the ultrasonic generator (4), the energy converter (5) and the amplitude converter (6) are all arranged through a mounting hole in the middle of the drill body (1); and the ultrasonic generator (4) is a rechargeable structure of a DC power supply and has a remote control unit, which is electrically connected to a remote signal receiving unit; The ultrasonic generator (4), energy converter (5) and amplitude transformer (6) all have cylindrical shells, and the outer circumferential surfaces of the three cylindrical shells are circumferentially distributed with a plurality of heat dissipation fins extending in a straight line or spirally, and air guide grooves are formed between adjacent heat dissipation fins; the drill bit body (1) is formed with a slag blowing channel connected to the mounting hole, and the outlet of the slag blowing channel is located at the front end of the drill bit; The claw teeth of the drill bit body (1) are provided with a portion of a slag blowing channel; or / and the radial extension portion of the ultrasonic actuator (3) is provided with a portion of a slag blowing channel; The ultrasonic actuator (3) and the amplitude transformer (6) are screwed together.

2. The ultrasonic vibration-assisted rapid drilling directional drilling drill bit according to claim 1, characterized in that: The ultrasonic generator (4) comprises a DC power supply and an inverter circuit, wherein the DC power supply is composed of a rechargeable battery having a charging interface.

3. The ultrasonic vibration-assisted rapid drilling directional drilling drill bit according to claim 1, characterized in that: The remote control unit has a frequency adjustment circuit and an opening and closing control circuit.

4. The ultrasonic vibration-assisted rapid drilling directional drilling drill bit according to claim 1, characterized in that: An annular groove is formed on the cylindrical shell, and the bottom diameter of the annular groove is smaller than the bottom diameter of the air guide groove.

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