A laser ultrasonic coaxial composite rock breaking device

Abstract

The present invention provides a laser-ultrasonic coaxial composite rock-breaking device, which relates to the technical field of drilling equipment and includes: a housing; a laser irradiation module, including an optical isolator and a lens arranged coaxially; and an ultrasonic drilling module, including an ultrasonic transducer, a helical groove horn, a first elastic member, and a drill bit. The upper end of the helical groove horn is connected to the ultrasonic transducer, and the lower end is connected to the drill bit. The first elastic member is connected to the lower end of the helical groove horn. A plurality of helical grooves are provided on the outer wall of the helical groove horn. Both the helical groove horn and the drill bit are hollowly arranged to form a laser channel. The beneficial effects of the present invention are as follows: While the drill bit is driven by the ultrasonic transducer to drill at the drilling point, the laser spot output by the optical isolator irradiates the drilling point through the lens and the laser channel. The rock is broken by using the composite method of the laser thermal effect and the ultrasonic vibration effect. The drill bit has achieved rock breaking before the molten material on the rock surface is formed, solving the problem that the secondary effect reduces the efficiency of laser rock breaking.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and particularly to a laser ultrasonic coaxial composite rock breaking device. Background Art

[0002] In the process of oil and gas resources and mineral exploitation, with the increase of drilling depth, the problem of high-hardness rock breaking becomes increasingly prominent, and the rock breaking efficiency greatly affects the overall operation efficiency. The traditional method adopted in geological exploration and oil and gas exploitation is mechanical rock breaking, which uses the high torque, high speed and high pressure of the drill bit to increase the drilling speed. Therefore, the wear of the drill bit is relatively serious and the working life is short. Due to the limitation of the existing mechanical rock breaking method in improving the drilling speed, new rock breaking methods have emerged continuously. Using methods such as plasma, electron beam, laser, microwave and ultrasonic wave to assist mechanical rock breaking can reduce the cost required for frequent drill tool replacement in the mechanical rock breaking method, save time and effectively improve the efficiency of rock breaking. However, each rock breaking method has some limiting factors in the actual working process.

[0003] Laser rock breaking is a non-contact physical and chemical rock breaking method, which uses a high-energy laser beam to act on the rock surface, causing local thermal breaking, melting and gasification of the rock. During the process of laser rock breaking, secondary effects will occur. With the increase of drilling depth, a large amount of molten matter will be generated due to the rock absorbing laser heat. Due to the limitation of laser energy, the molten matter cannot be completely gasified, but will recondense or accumulate around the hole wall and at the bottom to form residues, continuously absorbing laser energy and hindering further laser drilling; in addition, the gasified rock material will be heated by the laser to form an ionized plasma, which absorbs laser energy and hinders the further contact action between the laser and the rock surface material. Therefore, the holes drilled by laser are generally in an inverted conical shape with a wider top and a narrower bottom. The secondary effects will cause the loss of laser energy and reduce the efficiency of laser rock breaking. Summary of the Invention

[0004] In view of this, in order to solve the problem that the secondary effects generated during the process of laser rock breaking reduce the efficiency of laser rock breaking, an embodiment of the present invention provides a laser ultrasonic coaxial composite rock breaking device.

[0005] An embodiment of the present invention provides a laser ultrasonic coaxial composite rock breaking device, including:

[0006] A housing;

[0007] A laser irradiation module, which is arranged inside the housing, and the laser irradiation module includes an optical isolator and a lens arranged coaxially, and the lens is arranged below the laser irradiation module;

[0008] and an ultrasonic drilling module disposed inside the housing. The ultrasonic drilling module includes a ultrasonic transducer, a horn with spiral grooves, a first elastic member, and a drill bit. The ultrasonic transducer is disposed below the lens. The upper end of the horn with spiral grooves is connected to the ultrasonic transducer, and the lower end is connected to the drill bit. The first elastic member is fixedly disposed around the drill bit and connected to the lower end of the horn with spiral grooves. The horn with spiral grooves is conical with a gradually decreasing diameter from top to bottom. The outer wall of the horn with spiral grooves is provided with a plurality of spiral grooves. The horn with spiral grooves and the drill bit are both hollow to form a laser channel coaxially disposed with the lens;

[0009] While the ultrasonic transducer drives the drill bit to drill at the drilling point, the laser spot output by the optical isolator irradiates the drilling point through the lens and the laser channel. The laser heats the drilling point to reduce the rock strength, thereby increasing the drilling speed of the drill bit.

[0010] Further, the ultrasonic drilling module further includes a cylindrical impact head. The upper end of the drill bit is provided with a cylindrical receiving slot, and the lower end of the horn with spiral grooves is provided with an insertion joint. The insertion joint is inserted into the receiving slot. The impact head is fixedly sleeved around the periphery of the receiving slot, and the upper end of the impact head abuts against the lower end of the horn with spiral grooves and the lower end is connected to the first elastic member.

[0011] Further, the ultrasonic drilling module further includes a rotor rotatably disposed in the receiving slot and in contact with the insertion joint at the upper end. The rotor is coaxially disposed with the lens. The rotor has an inner hole axially penetrating along the rotor and located on the laser channel.

[0012] Further, the rotor is a hollow cylinder. The outer diameter of the rotor is the same as the diameter of the insertion joint and smaller than the inner diameter of the receiving slot. The upper end of the rotor abuts against the insertion joint.

[0013] Further, the ultrasonic drilling module further includes a support cylinder coaxially disposed with the horn with spiral grooves. The support cylinder includes an upper cylinder body, a connecting disk, and a lower cylinder body connected in sequence. The lower cylinder body is rotatably connected to the housing, and the connecting disk is rotatably supported inside the housing. The first elastic member is a first spring. The upper end of the first spring is sleeved and fixed to the lower end of the impact head, and the lower end is sleeved and fixed to the upper cylinder body.

[0014] Further, the ultrasonic drilling module further includes a second elastic member. The second elastic member is disposed around the drill bit. The upper end of the second elastic member is connected to the bottom of the receiving slot, and the lower end is connected to the middle of the connecting disk.

[0015] Further, the ultrasonic drilling module further includes a hollow screw, the upper end of the screw is connected to the ultrasonic transducer, and the lower end is inserted into the inner hole of the helical groove horn and threadedly connected to the helical groove horn.

[0016] Further, the ultrasonic transducer includes a piezoelectric ceramic stack, a gland and a nut. The upper end of the helical groove horn is provided with a support disc. The edge of the support disc is fixedly connected to the housing. The support disc is provided with an annular cut groove. The annular cut groove surrounds the helical groove horn, so that the thickness of the connection between the support disc and the helical groove horn is reduced. The piezoelectric ceramic stack is supported on the support disc. The gland is arranged on the upper part of the piezoelectric ceramic stack. The upper end of the screw penetrates through the support disc, the piezoelectric ceramic stack and the gland, and is fixedly connected to the nut.

[0017] Further, a head is provided at the front end of the inner hole of the drill bit, and the head is made of a light-transmitting material.

[0018] Further, it further includes a control system, a laser and an ultrasonic generator connected to the control system. The laser is connected to the optical isolator, and the ultrasonic generator is connected to the ultrasonic transducer.

[0019] The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are as follows:

[0020] 1. In a laser-ultrasonic coaxial composite rock breaking device of the present invention, the laser irradiation module and the ultrasonic drilling module are coaxially arranged. While the ultrasonic transducer drives the drill bit to drill into the drilling point, the laser spot output by the optical isolator irradiates the drilling point through the lens and the laser channel. The composite method of laser thermal effect and ultrasonic vibration effect is used to break rocks. When the melt has not yet formed when the laser irradiates the rock surface, the drill bit has achieved the rock breaking effect and reached the interior of the rock, avoiding a large amount of melt re-solidification or accumulation to form residues due to the rock absorbing laser heat, and solving the problem of reducing the laser rock breaking efficiency caused by the secondary effect in the process of laser rock breaking.

[0021] 2. In a laser-ultrasonic coaxial composite rock breaking device of the present invention, the ultrasonic drilling module generates longitudinal harmonic vibration through the ultrasonic transducer to drive the helical groove horn to move. The helical groove horn converts the longitudinal harmonic vibration into longitudinal harmonic vibration and circumferential torsional movement under the action of the helical groove on its surface, so as to drive the drill bit to vibrate longitudinally and twist at the same time. And the helical groove horn is constrained by the impact head and the first elastic member, so that the laser channel and the lens are still coaxial during the drilling process of the drill bit, ensuring that the laser spot output by the optical isolator can accurately irradiate the drilling point.

[0022] 3. A laser ultrasonic coaxial composite rock breaking device of the present invention is particularly suitable for hard rock drilling. It utilizes the heat generated by single-point laser irradiation and the drill bit to act on the designated drilling point of the rock, reducing the strength of the rock while achieving the drilling effect, thereby effectively improving the drilling speed of the ultrasonic transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of a laser ultrasonic coaxial composite rock breaking device of the present invention;

[0024] Figure 2 is an exploded view of a laser ultrasonic coaxial composite rock breaking device of the present invention;

[0025] Figure 3 is a sectional view of a laser ultrasonic coaxial composite rock breaking device of the present invention;

[0026] Figure 4 is Figure 3 a partial enlarged view of part A in

[0027] Figure 5 is a schematic diagram of a helical groove horn;

[0028] Figure 6 is a schematic diagram of the connection at the upper end of the drill bit;

[0029] Figure 7 is a schematic diagram of another embodiment of a laser ultrasonic coaxial composite rock breaking device of the present invention.

[0030] In the figure: 1. Outer shell; 2. Helical groove horn; 3. Drill bit; 4. Upper outer shell; 5. Middle outer shell; 6. Lower outer shell; 7. Extension tube; 8. Optical isolator; 9. Lens; 10. Fixed tube; 11. Piezoelectric ceramic stack; 12. Compression gland; 13. Nut; 14. Screw rod; 15. Support disc; 16. Annular cutting groove; 17. Laser channel; 18. Plug connector; 19. Impact head; 20. Rotor; 21. First elastic member; 22. Second elastic member; 23. Upper cylinder; 24. Connection disc; 25. Lower cylinder; 26. Bearing; 27. Helical groove; 100. Laser; 200. Ultrasonic generator; 300. Control system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in conjunction with the drawings. The following introduces a relatively optimal one among multiple possible embodiments of the present invention, aiming to provide a basic understanding of the present invention, but not aiming to identify the key or decisive elements of the present invention or limit the scope to be protected.

[0032] In all the examples shown and discussed here, any specific values should be construed as merely exemplary, rather than as limitations. Thus, other examples of the exemplary embodiments may have different values.

[0033] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be regarded as part of the specification.

[0034] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further discussed in subsequent figures. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the figures are not drawn in actual proportional relationships.

[0035] It should be noted that, unless otherwise clearly specified and defined, the terms "installed" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please refer to Figure 1 、 2 FIG. 1, FIG. 2 and FIG. 3, embodiments of the present invention provide a laser ultrasonic coaxial composite rock breaking device, including a housing 1, a laser irradiation module, and an ultrasonic drilling module.

[0037] The housing 1 is used for encapsulating and protecting the laser irradiation module and the ultrasonic drilling module. The shape of the housing 1 can be flexibly set according to the actual application scenario, and is generally set as a cylindrical shape. As described in this embodiment, the housing 1 includes an upper housing 4, a middle housing 5, and a lower housing 6 that are connected in sequence. The upper housing 4, the middle housing 5, and the lower housing 6 are cylindrical shapes with diameters decreasing in sequence.

[0038] The laser irradiation module is disposed inside the housing 1, specifically disposed in the upper part inside the housing 1. As described in this embodiment, the laser irradiation module is mainly disposed in the upper housing 4. The laser irradiation module includes an optical isolator 8 and a lens 9 that are coaxially disposed. The optical isolator 8 is disposed in the upper part inside the upper housing 4, and the lens 9 is disposed at the lower end of the upper housing 4, below the laser irradiation module. A fixed cylinder 10 is provided below the optical isolator 8. The fixed cylinder 10 penetrates the lower end of the upper housing 4, and the lens 9 is installed in the fixed cylinder 10. The laser output by the optical isolator 8 forms a laser beam with a predetermined spot diameter after passing through the lens 9.

[0039] The ultrasonic drilling module is disposed inside the housing 1, specifically at the lower part inside the housing 1. As shown in Figure 4 , 5 Figures 5 and 6, in this embodiment, the ultrasonic drilling module is mainly disposed in the middle housing 5 and the lower housing 6. The ultrasonic drilling module includes a ultrasonic transducer, a spiral groove horn 2, a first elastic member 21, and a drill bit 3. The ultrasonic transducer is disposed inside the middle housing 5, below the lens 9. The upper end of the spiral groove horn 2 is connected to the ultrasonic transducer, and the lower end is connected to the drill bit 3. The first elastic member 21 is fixedly disposed around the drill bit 3 and connected to the lower end of the spiral groove horn 2. The spiral groove horn 2 is in a conical shape with a gradually decreasing diameter from top to bottom. The outer wall of the spiral groove horn 2 is provided with a plurality of spiral grooves 27. The spiral groove horn 2 and the drill bit 3 are both hollow to form a laser channel 17 coaxially disposed with the lens 9.

[0040] When the ultrasonic transducer works, it can generate high-frequency longitudinal simple harmonic vibration. When the simple harmonic vibration is transmitted to the spiral groove horn 2, the spiral groove horn 2 performs elliptical motion due to the spiral grooves 27 on its surface, realizing longitudinal amplitude and torsional amplitude, thereby driving the drill bit 3 to perform longitudinal vibration and torsional vibration.

[0041] The ultrasonic drilling module further includes a hollow screw rod 14. The upper end of the screw rod 14 is connected to the ultrasonic transducer, and the lower end is inserted into the inner hole of the spiral groove horn 2 and threadedly connected to the spiral groove horn 2. Specifically, the ultrasonic transducer includes a piezoelectric ceramic stack 11, a gland 12, and a nut 13. The upper end of the spiral groove horn 2 is provided with a support disk 15. The piezoelectric ceramic stack 11 is supported on the support disk 15. The gland 12 is disposed on the upper part of the piezoelectric ceramic stack 11. The upper end of the screw rod 14 penetrates through the support disk 15, the piezoelectric ceramic stack 11, and the gland 12, and is fixedly connected to the nut 13. The inner hole of the screw rod is located on the laser channel 17.

[0042] In some embodiments, the support disk 15 is a flange disk. The edge of the support disk 15 is clamped and fixed by the upper ends of the middle housing 5 and the lower housing 6. The support disk 15 is provided with an annular cut groove 16. The annular cut groove 16 is disposed around the spiral groove horn 2, reducing the thickness of the connection between the support disk 15 and the spiral groove horn 2. Thus, the amplitude of the edge of the support disk 15 can be reduced, the amplitude of the spiral groove horn 2 can be increased, and the drilling efficiency can be improved.

[0043] In some embodiments, the ultrasonic drilling module further includes a cylindrical impact head 19. Specifically, a downwardly extending extension cylinder 7 is provided at the lower end of the lower housing 6, a cylindrical receiving slot is provided at the upper end of the drill bit 3, the receiving slot is located at the upper end of the extension cylinder 7, a plug connector 18 is provided at the lower end of the helical groove horn 2, the plug connector 18 is inserted into the receiving slot, the impact head 19 is fixedly sleeved around the periphery of the receiving slot, and the upper end of the impact head 19 abuts against the lower end of the helical groove horn 2 and the lower end is connected to the first elastic member 21. The impact head 19 ensures that when the drill bit 3 vibrates longitudinally and torsionally, the inner holes of the drill bit 3 and the helical groove horn 2 are coaxially arranged, ensuring the coaxiality of the laser channel 17.

[0044] In some embodiments, the ultrasonic drilling module further includes a support cylinder coaxially arranged with the helical groove horn 2. The support cylinder includes an upper cylinder body 23, a connecting disk 24 and a lower cylinder body 25 which are connected in sequence. The lower cylinder body 25 is rotatably connected to the housing 1. As described herein, a bearing 26 is sleeved outside the lower cylinder body 25, and the bearing 26 is installed at the lower end of the extension cylinder 7. The connecting disk 24 is rotatably supported inside the housing 1 and is arranged around the drill bit 3. The first elastic member 21 is a first spring. The upper end of the first spring is sleeved and fixed to the lower end of the impact head, and the lower end is sleeved and fixed to the upper cylinder body 23. The support cylinder restricts the lower end of the helical groove horn 2, enabling the helical groove horn 2 to only perform axial movement and rotation. By restricting the movement direction of the helical groove horn 2, the coaxiality of the laser channel 17 is ensured to a greater extent.

[0045] In some embodiments, the ultrasonic drilling module further includes a second elastic member 22. The second elastic member 22 is a second spring. The second elastic member 22 surrounds the drill bit 3 and is coaxially arranged with the drill bit 3. The upper end of the second elastic member 22 is connected to the bottom of the receiving slot, and the lower end is connected to the middle of the connecting disk 24. The second elastic member 22 and the support cylinder restrict the drill bit 3, enabling the drill bit 3 to only perform axial movement and rotation. By restricting the movement direction of the drill bit 3, the coaxiality of the laser channel 17 is ensured to a greater extent.

[0046] In some embodiments, the ultrasonic drilling module further includes a rotor 20, which is rotatably arranged in the socket and its upper end contacts the plug 18. The rotor 20 is coaxially arranged with the lens 9. The rotor 20 has an inner hole, which axially penetrates along the rotor 20 and is located on the laser channel 17. The rotor 20 is a hollow cylinder. The outer diameter of the rotor 20 is the same as the diameter of the plug 18 and is smaller than the inner diameter of the socket. The upper end of the rotor 20 abuts against the plug 18. The helical groove horn 2 transmits the harmonic vibration to the drill bit 3 through the rotor 20.

[0047] Considering that the front end of the drill bit 3 directly contacts the rock, in order to prevent the rock debris generated during the rock fragmentation from entering the interior of the drill bit 3. A head is provided at the front end of the inner hole of the drill bit 3, and the head is made of a light-transmitting material. The head has little attenuation of the light intensity, and at the same time, it can meet the requirement that the energy of the laser after passing through the head can meet the requirement for rock modification.

[0048] As Figure 3 shown, when the laser ultrasonic coaxial composite rock breaking device drills on the rock surface, the laser is input from the optical isolator 8. The laser passes through the lens 9 to form a laser beam with a predetermined spot diameter. The spot diameter of the laser beam is generally slightly smaller than the minimum diameter of the laser channel 17. The laser beam irradiates the drilling point on the rock surface through the laser channel 17.

[0049] At the same time, an ultrasonic wave is input to the ultrasonic transducer. The ultrasonic transducer generates a longitudinal harmonic vibration and transmits the longitudinal harmonic vibration to the helical groove horn 2. When the longitudinal harmonic vibration is transmitted to the section of the helical groove horn 2 located in the helical groove 27, the vibration force of the harmonic vibration is divided into an internal solid cone part and a surface helical groove 27 part. The vibration force received by the internal solid cone part is still longitudinal, but the vibration force received by the helical groove 27 part generates a tangential force at the bottom of the helical groove 27. In this way, the helical groove horn 2 twists circumferentially while vibrating longitudinally, thereby driving the drill bit 3 to vibrate longitudinally and twist at the same time, so that the drill bit 3 drills the drilling point irradiated by the laser beam. The laser heats the drilling point to reduce the rock strength, thereby increasing the drilling speed of the drill bit 3.

[0050] And the helical groove horn 2 is constrained by the impact head 19 and the first elastic member 21, that is, the torsional radius of the horn is constrained; the drill bit 3 is also constrained by the second elastic member 22 and the support cylinder, that is, the torsional radius of the drill bit 3 is constrained, so that the laser channel 17 and the lens 9 are still coaxial during the drilling process of the drill bit 3, ensuring that the laser spot output by the optical isolator 8 can accurately irradiate the drilling point.

[0051] In addition, as Figure 7 shown, in some embodiments, the laser-ultrasonic coaxial composite rock breaking device further includes a control system 300, a laser 100 and an ultrasonic generator 200 connected to the control system 300. The laser 100 is connected to the optical isolator 8, the laser emitted by the laser 100 is input to the optical isolator 8, and the control system 300 can adjust the laser parameters. The ultrasonic generator 200 is connected to the piezoelectric ceramic stack 11 of the ultrasonic transducer, and the ultrasonic wave output by the ultrasonic generator 200 generates a harmonic vibration through the ultrasonic transducer. The control system 300 can adjust the ultrasonic parameters.

[0052] In this article, the front, rear, upper, lower and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different usage and placement methods. The use of the orientation words should not limit the scope of protection claimed in this application.

[0053] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A laser ultrasonic coaxial composite rock breaking device, characterized in that Comprising: A housing; A laser irradiation module disposed inside the housing, the laser irradiation module including an optical isolator and a lens coaxially arranged, and the lens being disposed below the laser irradiation module; And an ultrasonic drilling module disposed inside the housing, the ultrasonic drilling module including a ultrasonic transducer, a spiral groove horn, a first elastic member, and a drill bit. Wherein the ultrasonic transducer is disposed below the lens, the upper end of the spiral groove horn is connected to the ultrasonic transducer, the lower end is connected to the drill bit, the first elastic member is fixedly arranged around the drill bit and connected to the lower end of the spiral groove horn. The spiral groove horn is a conical shape with a gradually decreasing diameter from top to bottom, and a plurality of spiral grooves are provided on the outer wall of the spiral groove horn. Both the spiral groove horn and the drill bit are hollowly arranged to form a laser channel coaxially arranged with the lens; While the ultrasonic transducer drives the drill bit to drill the drilling point, the laser spot output by the optical isolator irradiates the drilling point through the lens and the laser channel. The laser heats the drilling point to reduce the rock strength, thereby increasing the drilling speed of the drill bit; The ultrasonic drilling module further includes a cylindrical impact head. The upper end of the drill bit is provided with a cylindrical receiving slot, the lower end of the spiral groove horn is provided with a plug connector, and the plug connector is inserted into the receiving slot. The impact head is fixedly sleeved outside the receiving slot, and the upper end of the impact head abuts against the lower end of the spiral groove horn, and the lower end is connected to the first elastic member; The ultrasonic drilling module further includes a rotor rotatably disposed in the receiving slot and in contact with the plug connector at the upper end. The rotor is coaxially arranged with the lens, and the rotor has an inner hole axially penetrating along the rotor and located on the laser channel; The rotor is a hollow cylinder, the outer diameter of the rotor is the same as the diameter of the plug connector, and is smaller than the inner diameter of the receiving slot, and the upper end of the rotor abuts against the plug connector; The ultrasonic drilling module further includes a support cylinder coaxially arranged with the spiral groove horn. The support cylinder includes an upper cylinder body, a connecting disk, and a lower cylinder body connected in sequence. The lower cylinder body is rotatably connected to the housing, the connecting disk is rotatably supported inside the housing, and the first elastic member is a first spring. The upper end of the first spring is sleeved and fixed on the lower end of the impact head, and the lower end is sleeved and fixed on the upper cylinder body.

2. The laser ultrasonic coaxial composite rock breaking device according to claim 1, characterized in that: The ultrasonic drilling module further includes a second elastic member disposed around the drill bit. The upper end of the second elastic member is connected to the bottom of the receiving slot, and the lower end is connected to the middle of the connecting disk.

3. The laser ultrasonic coaxial composite rock breaking device according to claim 1, characterized in that: The ultrasonic drilling module further includes a hollow screw rod. The upper end of the screw rod is connected to the ultrasonic transducer, and the lower end is inserted into the inner hole of the spiral groove horn and threadedly connected to the spiral groove horn.

4. The laser ultrasonic coaxial composite rock breaking device according to claim 3, characterized in that: The ultrasonic transducer includes a piezoelectric ceramic stack, a gland, and a nut. A support disk is provided at the upper end of the horn with a spiral groove. The edge of the support disk is fixedly connected to the outer shell. The support disk is provided with an annular cut groove which surrounds the horn with a spiral groove, so that the thickness of the connection between the support disk and the horn with a spiral groove is reduced. The piezoelectric ceramic stack is supported on the support disk. The gland is arranged above the piezoelectric ceramic stack. The upper end of the screw rod penetrates through the support disk, the piezoelectric ceramic stack, and the gland, and is fixedly connected to the nut.

5. The laser ultrasonic coaxial composite rock breaking device according to claim 1, characterized in that: A head is provided at the front end of the inner hole of the drill bit, and the head is made of a light-transmitting material.

6. The laser ultrasonic coaxial composite rock breaking device according to claim 1, wherein: It further includes a control system, a laser connected to the control system, and an ultrasonic generator. The laser is connected to the optical isolator, and the ultrasonic generator is connected to the ultrasonic transducer.

Images