Rock breaking device, rock breaking method and mining machine using ultrasonic mechanical compound vibration

Abstract

The application discloses an ultrasonic mechanical compound vibration rock breaking device, a rock breaking method and a mine machinery, relates to the technical field of rock breaking devices and breaking methods, and comprises an inner cylinder, an outer cylinder, a cutting element, a mechanical vibration device and an ultrasonic vibration device. The outer cylinder is arranged outside the inner cylinder and is fixedly connected with the inner cylinder. The cutting element is installed at the distal end of the inner cylinder and the outer cylinder. The mechanical vibration device is used for generating periodic mechanical vibration. The ultrasonic vibration device is used for generating ultrasonic vibration. The mechanical vibration device and the ultrasonic vibration device are sequentially arranged in the inner cylinder in the axial direction. The distal end of the ultrasonic vibration device is connected with the cutting element, so that the cutting element can break rocks under the cooperation of the mechanical vibration device and the ultrasonic vibration device, a compound effect of 'first weakening and then breaking' is formed, the rock breaking efficiency is improved, the tool wear is reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the technical field of rock crushing devices and methods, and in particular to an ultrasonic mechanical composite vibration rock crushing device, rock crushing method, and mining machinery. Background Technology

[0002] In mining and tunneling construction, the efficiency of hard rock breaking directly affects the project progress and construction costs. Currently, underground hard rock tunneling mainly uses equipment such as tunnel boring machines (TBMs) or cantilever tunneling machines, which break rock strata by squeezing with disc cutters or cutting with pick-shaped cutting teeth.

[0003] However, in actual construction, the following technical defects were found in the existing rock breaking methods: First, the rock breaking efficiency is low. Due to the high strength and abrasiveness of the rock, the cutting tools have difficulty effectively penetrating the rock mass, resulting in slow equipment advance speed and short cycle advance, which seriously affects the construction progress. Second, the cutting tools wear out quickly. Under high pressure and high friction conditions, the cutting tools wear out quickly and have a short lifespan. Frequent tool replacements not only increase spare parts costs but also extend equipment downtime, seriously affecting the continuity of construction. Third, the working environment is harsh. The strong vibration and high decibel noise generated during rock breaking not only affect the physical and mental health of the operators but also accelerate the fatigue damage of the equipment's structural components.

[0004] In summary, existing rock-breaking equipment faces technical challenges when dealing with high-strength, highly abrasive hard rock formations, including low rock-breaking efficiency, rapid tool wear, and harsh operating environments. These challenges severely restrict the development of mining and tunneling engineering. Therefore, developing a new type of rock-breaking equipment that can effectively improve rock-breaking efficiency and reduce tool wear has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an ultrasonic-mechanical composite vibration rock breaking device, a rock breaking method, and mining machinery to solve the problems existing in the prior art, thereby improving rock breaking efficiency, reducing tool wear, and extending equipment service life.

[0006] To achieve the above objectives, the present invention provides the following solution: An ultrasonic-mechanical composite vibration rock-breaking device includes an inner cylinder; A cutting element, wherein the cutting element is installed at the distal end of the inner cylinder; A mechanical vibration device for generating periodic mechanical vibration; The device includes an ultrasonic vibration device for generating ultrasonic vibrations. The mechanical vibration device and the ultrasonic vibration device are sequentially arranged axially inside the inner cylinder. The distal end of the ultrasonic vibration device is connected to the cutting element, enabling the cutting element to break rock under the synergistic action of the mechanical vibration device and the ultrasonic vibration device.

[0007] In an exemplary embodiment, the mechanical vibration device is an exciter; the exciter includes an exciter shaft and an eccentric block mounted on the exciter shaft; the exciter shaft is connected to a drive device through a transmission assembly, and the eccentric block generates periodic centrifugal force under the drive of the exciter shaft, causing the ultrasonic-mechanical composite vibration rock breaking device to generate periodic circular oscillation.

[0008] In one exemplary embodiment, the ultrasonic vibration device includes an ultrasonic generator, a transducer, and an amplitude transformer; the ultrasonic generator is integrally disposed with the transducer, the proximal end of the amplitude transformer is fixedly connected to the transducer, and the distal end of the amplitude transformer is connected to the cutting element.

[0009] In one exemplary embodiment, an outer cylinder is further included, which is sleeved on the outside of the inner cylinder and fixedly connected to the inner cylinder.

[0010] In an exemplary embodiment, the inner cylinder includes a first cylinder, a second cylinder, and a third cylinder arranged sequentially from the distal end to the proximal end along the axial direction of the cylinder. The first cylinder is fixedly connected to the second cylinder, and the second cylinder is fixedly connected to the third cylinder. The ultrasonic vibration device is located inside the first cylinder and the second cylinder, and the mechanical vibration device is located inside the third cylinder. The proximal end of the ultrasonic vibration device is disconnected from the distal end of the mechanical vibration device to avoid interference between the two vibrations. A sound-absorbing pad is provided between the first inner sleeve and the second inner sleeve to prevent ultrasonic vibration from propagating towards the side closer to the mechanical vibration device.

[0011] In one exemplary embodiment, the inner cylinder and the outer cylinder are coaxially arranged, and the axis of the cutting element is inclined relative to the axis of the inner cylinder.

[0012] In one exemplary embodiment, the device further includes a connecting shaft with an eccentric structure installed at the far end of the inner cylinder and the outer cylinder. The connecting shaft with the eccentric structure is fixedly connected to the far end of the amplitude transformer. The cutting element is rotatably connected to the connecting shaft with the eccentric structure, so that the axis of the cutting element can be tilted relative to the axis of the inner cylinder.

[0013] In one exemplary embodiment, the cutting element is a single cutter head, the outer edge of which is provided with a plurality of cutting teeth evenly distributed along the circumferential direction of the cutter head, all of which together form a serrated annular cutting profile; or the cutting element is a composite cutting structure, the composite cutting structure including a base, cutting teeth and annular cutter head, the central region of the base is provided with the cutting teeth, and a plurality of annular cutter heads are provided along the circumferential direction of the base; along the radial direction of the base, the annular cutter heads are located outside the cutting teeth.

[0014] A rock-breaking method includes a mechanical vibration device and an ultrasonic vibration device arranged sequentially along the axial direction from the proximal end to the distal end within a cylinder, and a cutting element rotatably mounted at the distal end of the cylinder; activating the ultrasonic vibration device to generate ultrasonic vibration near the cutting element; activating the mechanical vibration device to generate periodic mechanical vibration at the cutting element; pressing the cutting element against the rock mass to be broken, causing the mechanical vibration from the mechanical vibration device and the ultrasonic vibration from the ultrasonic vibration device to superimpose at the cutting element, generating a composite vibration excitation on the rock mass cutting zone, forming a composite effect of "weakening first, then breaking"; continuously advancing the ultrasonic-mechanical composite vibration rock-breaking device and adjusting the ultrasonic output power, mechanical vibration frequency, and advancing speed according to the lithological conditions to promote crack propagation and rock fragment spalling, thus completing the breaking of the rock mass.

[0015] A mining machine includes the aforementioned ultrasonic mechanical composite vibration rock breaking device and a propulsion mechanism, wherein the ultrasonic mechanical composite vibration rock breaking device is mounted on the propulsion mechanism.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention significantly improves rock-breaking efficiency by superimposing ultrasonic vibration and periodic mechanical vibration within the same axis system, enabling the cutting element to generate multi-frequency composite excitation on the rock mass during operation. Specifically, ultrasonic vibration can generate numerous microcracks and fatigue damage within the rock mass, weakening the rock before it is fully stressed. Subsequently, mechanical vibration and cutting action promote the rapid propagation of these microcracks within the rock mass, making the rock fragments easier to break off. Therefore, the device and method of this application can significantly reduce the rock-breaking specific energy and improve the rock-breaking performance of the device.

[0017] Furthermore, because the rock strength is pre-weakened, the cutting force and torque required by the cutting element to achieve the same rock-breaking effect are significantly reduced, and the peak load on the tool decreases. This not only effectively reduces tool wear and lowers the risk of failures such as chipping and tooth breakage, but also reduces the average stress level of the transmission system, which helps to extend the overall service life of the equipment.

[0018] Furthermore, this invention efficiently arranges ultrasonic vibration devices and mechanical vibration devices within a limited space without increasing the external dimensions, making it easy to integrate and apply in various equipment such as tunnel boring machines and tunneling machines. It has comprehensive advantages such as compact structure, low energy consumption, strong adaptability, and convenient maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the isometric structure of an ultrasonic-mechanical composite vibration rock-breaking device disclosed in a specific embodiment of the present invention. Figure 2 This is a bottom view of the ultrasonic-mechanical composite vibration rock-breaking device disclosed in a specific embodiment of the present invention. Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 This is a schematic diagram of the cutting element used in an ultrasonic-mechanical composite vibration rock breaking device disclosed in another specific embodiment of the present invention.

[0021] Among them, 1. First spur gear; 2. Second spur gear; 3. Coupling; 4. Fourth connecting flange; 5. Fifth rolling bearing; 6. Fifth annular bushing; 7. Fifth connecting flange; 8. Fourth rolling bearing; 9. Eccentric block; 10. Vibrator shaft; 11. Third cylinder; 12. Third rolling bearing; 13. Fourth annular bushing; 14. Second cylinder; 15. Transducer; 16. Sound-absorbing pad; 17. First threaded connector; 18. First 19. Cylinder body; 20. Amplifier rod; 21. Outer cylinder body; 22. Second threaded connector; 23. Second rolling bearing; 24. Third annular bushing; 25. First connecting flange; 26. Second connecting flange; 27. Connecting shaft with eccentric structure; 28. Third connecting flange; 29. ​​Second annular bushing; 30. First annular bushing; 31. First rolling bearing; 32. Washer; 33. Cutting element; 34. Annular cutter head; 35. Base; 36. Cutting tooth. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figures 1 to 4 This embodiment provides an ultrasonic-mechanical composite vibration rock breaking device, including an inner cylinder, an outer cylinder 20, a cutting element 32, a mechanical vibration device, and an ultrasonic vibration device.

[0025] The inner cylinder is used to install the mechanical vibration device and the ultrasonic vibration device. For ease of assembly, the inner cylinder includes a first cylinder 18, a second cylinder 14, and a third cylinder 11 arranged sequentially from the distal end to the proximal end along the axial direction of the cylinder. The first cylinder 18 and the second cylinder 14 are fixedly connected by threaded connectors, and the second cylinder 14 and the third cylinder 11 are also fixedly connected by threaded connectors. The ultrasonic vibration device is installed inside the first cylinder 18 and the second cylinder 14, and the mechanical vibration device is installed inside the third cylinder 11. An annular sound-absorbing pad 16 is provided between the mating surfaces of the first cylinder 18 and the second cylinder 14. The sound-absorbing pad 16 is made of an elastic material capable of absorbing vibrations. In one specific embodiment, the sound-absorbing pad 16 is made of polytetrafluoroethylene (PTFE) material, used to block the ultrasonic vibration from being transmitted to the side closer to the mechanical vibration device. The distal end of the mechanical vibration device and the proximal end of the ultrasonic vibration device are disconnected, i.e., they are in a non-contact, suspended state to avoid interference between the two vibrations.

[0026] It should be noted that, with reference to the working state of the rock-breaking device, the side closer to the rock mass to be broken is the far end, and the side farther from the rock mass to be broken and closer to the operator is the near end.

[0027] The outer cylinder 20 is fitted onto the outside of the inner cylinder and is fixedly connected to the inner cylinder via a connecting flange. Specifically, the outer cylinder 20 is connected to the first cylinder 18 via a first connecting flange 24 and a threaded connector, and the outer cylinder 20 is connected to the third cylinder 11 via a fifth connecting flange 7 and a threaded connector.

[0028] The cutting element 32 is the end-effector that directly acts on the fractured hard rock mass. The cutting element 32 is installed at the far end of the inner and outer cylinders 20. The inner and outer cylinders 20 are coaxially arranged, and the axis of the cutting element 32 is inclined relative to the axis of the inner cylinder. Specifically, the ends of the inner and outer cylinders 20 are provided with a connecting shaft 26 with an eccentric structure. The connecting shaft 26 with the eccentric structure is connected to the first connecting flange 24 via a second connecting flange 25, thus being installed at the end of the outer cylinder 20. This connecting shaft 26 with the eccentric structure is a stepped shaft. The cutting element 32 is rotatably connected to the small end of this stepped shaft via a third connecting flange 27 and a first rolling bearing 30. The connecting shaft 26 with the eccentric structure allows the cutting element 32 to have a fixed eccentricity, which is then transformed into a circular oscillation with a variable eccentricity by a mechanical vibration device. During operation, the cutting element 32 presses against the hard rock. When the mining machinery moves, the cutting element 32 passively performs non-circular oscillation, thereby adjusting the angle of the cutting element 32, preventing the cutting element 32 from being worn off-center, and improving its service life.

[0029] In an exemplary embodiment, the angle between the axis of the cutting element 32 and the axis of the connecting shaft 26 with the eccentric structure is 2.36°.

[0030] The cutting element 32 has two different structural forms. Figure 3 The first type of cutting element 32 is shown, which adopts a single cutter head structure. The outer edge of the cutter head is provided with a number of cutting teeth evenly distributed along the circumference of the cutter head. All these cutting teeth together form a sawtooth-shaped annular cutting profile. In an exemplary embodiment, 60 cutting teeth are evenly arranged along the circumference of the cutter head. Figure 4 The second type of cutting element 32 is shown, which adopts a composite cutting head structure. This cutting element 32 includes a base 34, cutting teeth 35, and annular cutter heads 33. The cutting teeth 35 are located in the central area of ​​the base 34, and several annular cutter heads 33 are arranged along the circumference of the base 34. The annular cutter heads 33 are located outside the cutting teeth 35 along the radial direction of the base 34. The cutting teeth 35 are used for localized crushing and fracturing of the rock mass, while the multiple annular cutter heads 33 are used for continuous cutting and extended stripping of the pre-crushed rock mass, thus forming a composite rock-breaking mode of "point crushing—surface cutting".

[0031] A mechanical vibration device is used to generate periodic mechanical vibrations to drive the entire auxiliary rock-breaking device to perform periodic circular oscillations. The mechanical vibration device is an exciter; the exciter includes an exciter shaft 10 and an eccentric block 9; the exciter shaft 10 is a solid stepped shaft, which is connected to the drive device via a transmission assembly. The eccentric block 9 is fixedly mounted on the exciter shaft 10. In use, the drive device drives the exciter shaft 10 to rotate, and the eccentric block 9, driven by the exciter shaft 10, generates periodic centrifugal force, causing the ultrasonic-mechanical composite vibration rock-breaking device to produce periodic circular oscillations. In this example, the periodic centrifugal force generated by the eccentric block 9 is... Where m is the mass of eccentric block 9, taken as m = 4 kg. Let ω be the angular velocity and e be the eccentricity. Take e = 1 mm. The mechanical vibration device can generate radial mechanical vibration with a frequency range of 20-100 Hz at the cutting element 32.

[0032] It should be noted that mechanical vibration devices are not limited to exciters; they can also be other devices capable of generating periodic circular oscillations.

[0033] In one exemplary embodiment, the vibrator shaft 10 is connected to the drive device (motor) via a coupling 3 and a first spur gear 1 and a second spur gear 2 that mesh with each other. The connection method between the vibrator shaft 10 and the drive device is not limited to gear connection, but can also be other transmission structures such as belt drive and chain drive.

[0034] The ultrasonic vibration device includes an ultrasonic generator, a transducer 15, and an amplitude transformer 19. The ultrasonic generator and transducer 15 are integrally formed. The proximal end of the amplitude transformer 19 is fixedly connected to the transducer 15 via a first threaded connector 17, and the distal end of the amplitude transformer 19 is fixedly connected to a cutting element 32 via a second threaded connector 21, so as to amplify the ultrasonic vibration and transmit it to the cutting element 32. The amplitude transformer 19 is a stepped rod, and the diameter of the proximal end of the amplitude transformer 19 is larger than the diameter of the distal end. In an exemplary embodiment, the total length of the amplitude transformer 19 is 140 mm, and its amplitude ratio is: Where D1 is the diameter of the near end of the amplitude transformer 19, and D1=40mm; D2 is the diameter of the far end of the amplitude transformer 19, and D2=25mm. The calculated amplitude ratio is 1.6.

[0035] It should be noted that the mechanical vibration device and the ultrasonic vibration device are not connected. Specifically, the proximal end of the transducer 15 is disconnected from the distal end of the exciter shaft 10 and is in a non-contact, suspended state.

[0036] Each shaft component is positioned and supported by annular bushings and rolling bearings. Specifically, the cutting element 32 is connected to the eccentric connecting shaft 26 via the first annular bushing 29, the second annular bushing 28, and the first rolling bearing 30. The distal end of the eccentric connecting shaft 26 is connected to the cutting element 32 via a washer 31. The first cylinder 18 is connected to the outer cylinder 20 via the second rolling bearing 22 and the third annular bushing 23. The distal end of the vibrator shaft 10 is connected to the third cylinder 11 via the third rolling bearing 12 and the fourth annular bushing 13. The proximal end of the vibrator shaft 10 is connected to the third cylinder 11 via the fifth connecting flange 7, and the proximal end of the vibrator shaft 10 is connected to the fifth connecting flange 7 via the fourth rolling bearing 8. The coupling 3 is connected to the fifth connecting flange 7 via the fourth connecting flange 4, and to the outer cylinder 20 via the fifth rolling bearing 5 and the fifth annular bushing 6.

[0037] Example 2: A rock-breaking method includes the following: a mechanical vibration device and an ultrasonic vibration device are arranged sequentially along the axial direction from the proximal end to the distal end of the cylinder, and a cutting element 32 is installed at the distal end of the cylinder.

[0038] The ultrasonic vibration device is activated to generate ultrasonic vibration near the cutting element 32.

[0039] Specifically, the ultrasonic vibration device includes an ultrasonic generator, a transducer 15, and an amplitude transformer 19. The ultrasonic generator is activated to provide an electrical signal with a frequency of 20-40kHz to the transducer 15, causing the transducer 15 to output axial ultrasonic vibration. This ultrasonic vibration is amplified by the stepped amplitude transformer 19 and transmitted to the vicinity of the cutting element 32.

[0040] The mechanical vibration device is activated to generate periodic mechanical vibration at the cutting element 32.

[0041] Specifically, the mechanical vibration device includes a vibrator shaft 10 and an eccentric block 9 mounted on the vibrator shaft 10. The vibrator shaft 10 is connected to the drive device. When the drive device is started, it drives the vibrator shaft 10 to rotate. The eccentric block 9 rotates with the vibrator shaft 10 and generates periodic centrifugal force, thereby generating periodic mechanical vibration at the cutting element 32.

[0042] During tunneling or rock breaking operations, the rotating cutting element 32 is pressed against the rock mass to be broken, so that the mechanical vibration from the mechanical vibration device and the ultrasonic vibration from the ultrasonic vibration device are superimposed at the cutting element 32, generating a compound vibration excitation on the rock cutting area, forming a compound effect of "weakening first and then breaking".

[0043] Specifically, the ultrasonic-mechanical composite vibration rock breaking device is installed on the propulsion mechanism. Driven by the propulsion mechanism, the cutting element 32 presses against the rock mass to be broken. The cutting element 32 is rotatably connected to the cylinder through the connecting shaft 26 with an eccentric structure, so that the cutting element 32 can passively rotate according to the surface characteristics of the rock mass it contacts during the process of contacting and breaking the rock mass, thereby adjusting the angle of the cutting element 32 in real time and preventing the cutting element 32 from being worn off-center.

[0044] By continuously advancing and adjusting the ultrasonic output power, mechanical vibration frequency, and advancement speed according to the lithological conditions, crack propagation and rock fragment spalling are promoted, thus completing the fracturing of the rock mass.

[0045] It should be noted that the rock-breaking method described in this embodiment preferably uses the ultrasonic-mechanical composite vibration rock-breaking device described in Embodiment 1, but the rock-breaking device used is not limited to Embodiment 1. Other rock-breaking devices that can be applied to this rock-breaking method are also within the scope of protection of this application.

[0046] Example 3: A mining machine includes an ultrasonic mechanical composite vibration rock breaking device and a propulsion mechanism, wherein the ultrasonic mechanical composite vibration rock breaking device is installed on the propulsion mechanism.

[0047] It should be noted that the mining machinery described in Example 3 preferentially adopts the rock-breaking device described in Example 1 and the rock-breaking method described in Example 2, which can at least achieve all the technical effects described in Example 1 and Example 2.

[0048] In the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0049] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0050] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An ultrasonic-mechanical composite vibration rock-breaking device, characterized in that, include: inner cylinder; A cutting element, wherein the cutting element is installed at the distal end of the inner cylinder; A mechanical vibration device for generating periodic mechanical vibration; The device includes an ultrasonic vibration device for generating ultrasonic vibrations. The mechanical vibration device and the ultrasonic vibration device are sequentially arranged axially inside the inner cylinder. The distal end of the ultrasonic vibration device is connected to the cutting element, enabling the cutting element to break rock under the synergistic action of the mechanical vibration device and the ultrasonic vibration device.

2. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 1, characterized in that, The mechanical vibration device is an exciter; the exciter includes an exciter shaft and an eccentric block mounted on the exciter shaft; the exciter shaft is connected to a drive device through a transmission assembly, and the eccentric block generates periodic centrifugal force under the drive of the exciter shaft, causing the ultrasonic-mechanical composite vibration rock breaking device to generate periodic circular oscillation.

3. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 1, characterized in that, The ultrasonic vibration device includes an ultrasonic generator, a transducer, and an amplitude transformer; the ultrasonic generator and the transducer are integrally formed, the proximal end of the amplitude transformer is fixedly connected to the transducer, and the distal end of the amplitude transformer is connected to the cutting element.

4. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 1, characterized in that, It also includes an outer cylinder, which is sleeved on the outside of the inner cylinder and fixedly connected to the inner cylinder.

5. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 4, characterized in that, The inner cylinder includes a first cylinder, a second cylinder, and a third cylinder arranged sequentially from the distal end to the proximal end along the axial direction of the cylinder. The first cylinder is fixedly connected to the second cylinder, and the second cylinder is fixedly connected to the third cylinder. The ultrasonic vibration device is located inside the first cylinder and the second cylinder, and the mechanical vibration device is located inside the third cylinder. The proximal end of the ultrasonic vibration device is disconnected from the distal end of the mechanical vibration device to avoid interference between the two vibrations. A sound-absorbing pad is provided between the first inner sleeve and the second inner sleeve to prevent ultrasonic vibration from propagating to the side closer to the mechanical vibration device.

6. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 4, characterized in that: The inner cylinder and the outer cylinder are coaxially arranged, and the axis of the cutting element is inclined relative to the axis of the inner cylinder.

7. The ultrasonic-mechanical composite vibration rock-breaking device according to claim 6, characterized in that: It also includes a connecting shaft with an eccentric structure installed at the far end of the inner cylinder and the outer cylinder. The connecting shaft with the eccentric structure is fixedly connected to the far end of the amplitude transformer. The cutting element is rotatably connected to the connecting shaft with the eccentric structure, so that the axis of the cutting element can be tilted relative to the axis of the inner cylinder.

8. The ultrasonic-mechanical composite vibration rock-breaking device according to any one of claims 1 to 7, characterized in that: The cutting element is a single cutter disc, and the outer edge of the single cutter disc is provided with a plurality of cutting teeth evenly distributed along the circumferential direction of the cutter disc. All the cutting teeth together form a sawtooth-shaped annular cutting profile. Alternatively, the cutting element may be a composite cutting structure, which includes a base, cutting teeth, and an annular cutter disc. The cutting teeth are provided in the central area of ​​the base, and a plurality of annular cutter discs are provided along the circumference of the base. The annular cutter discs are located outside the cutting teeth along the radial direction of the base.

9. A method for breaking rocks, characterized in that, It includes a mechanical vibration device and an ultrasonic vibration device arranged sequentially in the cylinder from the proximal end to the distal end along the axial direction, as well as a cutting element that can be rotatably installed at the distal end of the cylinder. The ultrasonic vibration device is activated to generate ultrasonic vibrations near the cutting element; The mechanical vibration device is activated to generate periodic mechanical vibration at the cutting element; The cutting element is pressed against the rock mass to be broken, so that the mechanical vibration from the mechanical vibration device and the ultrasonic vibration from the ultrasonic vibration device are superimposed at the cutting element, generating a compound vibration excitation on the rock cutting area, forming a compound effect of "weakening first and then breaking". The ultrasonic-mechanical composite vibration rock breaking device is continuously advanced, and the ultrasonic output power, mechanical vibration frequency and advancing speed are adjusted according to the rock conditions to promote crack propagation and rock fragments peel off, thereby completing the crushing of the rock mass.

10. A type of mining machinery, characterized in that, The device includes the ultrasonic-mechanical composite vibration rock-breaking device and the propulsion mechanism as described in any one of claims 1 to 8, wherein the ultrasonic-mechanical composite vibration rock-breaking device is mounted on the propulsion mechanism.

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