Auxiliary rock breaking device based on ultrasonic excitation and using method thereof

Abstract

The invention discloses an auxiliary rock breaking device based on ultrasonic excitation and a using method of the auxiliary rock breaking device. The whole auxiliary rock breaking device is arranged, and the auxiliary rock breaking device is fastened to a rock drill through a fastening device; a hydraulic propelling device is adopted to ensure that the compaction ring is tightly attached to the rock mass, and the length of the auxiliary rock breaking device is adjusted; performing natural frequency detection on the rock mass through a rock mass natural frequency detection system, and inputting corresponding high-frequency alternating current into an ultrasonic generator according to a detection result; the high-frequency alternating current is input into the ultrasonic transducer through the circuit control system and concentrated on the compaction ring at the top end through the amplitude-change pole, and the construction rock mass is effectively excited. The method has the beneficial effects that the existing rock drill is utilized; the drill rod is separated from the ultrasonic excitation device, so that excitation damage of ultrasonic waves to the drill rod and energy loss caused by high-frequency impact are avoided; the auxiliary rock breaking device is tightly attached to the rock mass, the excitation range is large, power is high, large-volume rock mass fracture development can be promoted, and the rock mass breaking strength is reduced.

Description

Technical Field

[0001] This invention pertains to hard rock breaking tools in fields such as tunnel excavation and metal mining, specifically relating to the design and usage of an auxiliary rock breaking device based on ultrasonic excitation. Background Technology

[0002] The ever-increasing demand for mineral resources forces mines to continuously improve mining efficiency and intensity. Low efficiency in hard rock breaking and high drill bit wear are common problems faced in deep tunnel excavation and metal deposit mining. Introducing ultrasonic vibration excitation technology into the field of rock breaking can provide new ideas for hard rock breaking.

[0003] Ultrasonic vibration rock breaking technology was first applied in space drilling and polar drilling by European and American countries, leading to the development of ultrasonic drilling samplers and ultrasonic vibrating rotary samplers. Subsequently, ultrasonic technology was introduced into the fields of ceramic and gemstone drilling and rock breaking, with researchers developing ultrasonic drilling machines and ultrasonic drilling rigs. These devices typically mount the ultrasonic transducer, amplitude transformer, drill rod, and drill bit on the same axis. The high-frequency vibration generated by ultrasonic excitation is concentrated on the drill bit, achieving the goal of breaking materials with minimal energy. However, this device essentially breaks the surface of the material through high-frequency impact, with less ultrasonic excitation inside the material, resulting in minimal crack development. Simultaneously, the high-frequency vibration friction of the impact drill causes some ultrasonic vibration energy to be converted into heat energy and dissipated. When using an ultrasonic pressure machine to subject rock specimens to compressive loading, the rock specimen exhibits layered failure from top to bottom, rather than developing through-the-part cracks. The temperature of the rock specimen rises rapidly, and only the area in contact with the pressure machine shows powder and grooves on the upper surface, while the rest of the upper surface remains relatively intact until cracks appear in the upper part of the specimen.

[0004] The natural frequencies of intact, dense, hard rock are generally between 20 kHz and 40 kHz. Exciting vibrations in the rock with ultrasound can cause rapid internal cracking and a significant decrease in rock strength, achieving ultrasonic-induced fatigue-resonance failure. If a rock specimen is first subjected to ultrasonic excitation and then subjected to compressive loading, the compressive strength and elastic modulus of the rock specimen will be significantly reduced, and cracks will form through the specimen. Ultrasonic vibration excitation can effectively weaken the mechanical properties of rock. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary rock-breaking device based on ultrasonic excitation, which utilizes ultrasonic excitation in conjunction with a rock drill to improve rock-breaking efficiency.

[0006] This invention includes a fastening device, a hydraulic propulsion device, a rock mass natural frequency detection system, and an ultrasonic excitation system; The fastening device is cylindrical in shape and is fitted over the outside of the rock drill, with the drill rod passing through the middle of the fastening device. The hydraulic propulsion device includes an annular hydraulic cylinder, a piston that cooperates with the hydraulic cylinder, and an annular steel ring fixed to the front section of the piston; the hydraulic cylinder is mounted on the fastening device. The rock mass natural frequency detection system includes a ring connector I, a piezoelectric accelerometer, a detection frequency output line, and a natural frequency analyzer; the ring connector I is mounted on the annular steel ring and has a circuit control device installed inside; the piezoelectric accelerometer is electrically connected to the natural frequency analyzer through the detection frequency output line. The ultrasonic excitation system includes a ring connector II, a compaction ring, an amplitude transformer, an ultrasonic generator, and a high-frequency current input line. The ring connector II is fixedly installed on the ring connector I. Multiple ultrasonic transducers are evenly arranged in a ring inside the ring connector II. The compaction ring is fixedly installed on the ring connector II through amplitude transformers of the same number as the ultrasonic transducers. The bottom of each amplitude transformer is connected to the corresponding ultrasonic transducer. The ultrasonic generator is electrically connected to the circuit control device via the high-frequency current input line, and the circuit control device is electrically connected to the ultrasonic transducer. The piezoelectric accelerometer is mounted on the ring connector II.

[0007] Preferably, the ring connector I and the ring connector II are an integral structure.

[0008] Preferably, the annular connector II has multiple mounting slots distributed in a ring, the ultrasonic transducer is located at the bottom of the mounting slot, and the amplitude transformer is fitted onto the mounting slot.

[0009] Furthermore, the ultrasonic generator is a frequency-adjustable ultrasonic generator, which adjusts the emitted ultrasonic frequency according to the natural frequency of different rocks.

[0010] Preferably, the number of amplitude rods is 6 to 10; Preferably, the hydraulic propulsion device further includes a pressure sensor and a hydraulic control system. The pressure sensor is used to detect the force state of the piston, and the hydraulic control system controls the oil pressure of the hydraulic propulsion device to ensure that the compaction ring can always be tightly attached to the rock surface with a certain pressure, while not interfering with the rock drill's forward drilling.

[0011] The auxiliary rock-breaking device is cylindrical in shape. The drill rod passes through the middle of the auxiliary rock-breaking device. The fastening device is fitted on the outside of the rock drill and is fastened by clamps or other means to fix the auxiliary rock-breaking device on the rock drill.

[0012] The hydraulic propulsion device can apply thrust in the drilling direction. As the drilling depth increases, the piston of the hydraulic propulsion device contracts to ensure that the compaction ring is tightly attached to the surface of the rock mass. The length of the piston of the hydraulic propulsion device meets the construction requirements for loading and unloading drill rods of the rock drill.

[0013] The rock drill applies impact vibration to the rock mass through the drill rod. The rock mass vibration signal is transmitted to the piezoelectric accelerometer through the compaction ring and the amplitude transformer, and is converted into an electrical signal. The signal is then output to the natural frequency analyzer through the detection frequency output line to determine the natural frequency of the rock mass. The detection result is input to the adjustable frequency ultrasonic generator to generate a corresponding high-frequency current. The current is input to the circuit control device through the high-frequency current input line.

[0014] The aforementioned adjustable frequency ultrasonic generator produces a high-frequency alternating current, which is input into multiple ultrasonic transducers arranged in a ring through a circuit control system. The electrical signal is converted into a vibration signal, which is concentrated onto the compaction ring at the top through an amplitude transformer. The compaction ring provides a wide-range, high-power excitation to the rock mass under construction, promoting the development of internal fissures in the rock mass.

[0015] Another object of the present invention is to provide a method of using an ultrasonic-excited assisted rock-breaking device, as follows: 1. Fix the rock drill to the construction area using the support structure, put the fastening device on the outside of the rock drill, pass the drill rod through the middle of the fastening device, fix the auxiliary rock breaking device on the rock drill, inject fluid into the hydraulic propulsion device, extend the piston, so that the compaction ring is tightly attached to the rock surface, place the natural frequency analyzer and ultrasonic generator on the ground, and connect the high frequency current input line and the detection frequency output line. 2. Start the rock drill. The drill rod applies impact vibration to the rock mass. The piezoelectric accelerometer receives the vibration signal of the rock mass and converts it into an electrical signal, which is then input to the natural frequency analyzer to determine the natural frequency of the rock mass. The ultrasonic generator generates a corresponding high-frequency current based on the detection results. The ultrasonic transducer converts the high-frequency current into high-frequency mechanical vibration. The amplitude transformer amplifies the amplitude of the mechanical vibration. Finally, the high-frequency mechanical vibration is applied to the rock mass through the compaction ring, and the auxiliary rock breaking device begins to excite the rock mass with ultrasonic waves. Third, during the construction of the rock drill, the hydraulic propulsion device automatically retracts the piston according to the drilling depth and drill rod wear. At the same time, the hydraulic pressure is controlled to ensure that the compaction ring is always in close contact with the rock mass. The rock mass natural frequency detection system detects the natural frequency of the rock mass in real time, and the output current frequency of the adjustable ultrasonic generator is adjusted in real time to provide large-scale and efficient excitation to the rock mass. Under the combined action of the rock drilling impact drill and ultrasonic excitation, efficient crushing of hard rock is achieved. 4. After the hard rock is broken, rotate the rock drill to select a new rock breaking position. The piston of the hydraulic propulsion device extends, and the compaction ring is pressed tightly against the rock mass. Repeat the construction steps in steps two and three. When the construction is completed, retract the piston, turn off the auxiliary rock breaking device and the rock drill in sequence, remove the high-frequency current input line and the detection frequency output line, loosen the clamps of the fastening device, remove the auxiliary rock breaking device from the rock drill, and tidy up the construction area.

[0016] Preferably, the hydraulic propulsion device monitors the stress state of the piston rod at a frequency of 20-40 times per minute, and adjusts the hydraulic pressure to ensure that the compaction ring is always in close contact with the rock surface.

[0017] The beneficial effects of this invention are that the auxiliary rock-breaking device can be directly installed on existing drilling rigs via a fastening device, making it convenient to use; the rock drilling rod and ultrasonic excitation device are separated, so that ultrasonic excitation and drill rod impact are applied to the rock respectively, which significantly reduces the energy loss caused by high-frequency vibration and friction of the drill rod, and avoids ultrasonic excitation damage to the drill rod; the auxiliary rock-breaking device has multiple ultrasonic transducers arranged in a ring, with a large ultrasonic excitation range and high power. The hydraulic propulsion device makes the compaction ring fit tightly against the rock mass, ensuring the excitation effect of ultrasonic waves on the rock, which can effectively promote the development of fractures in large-volume rock masses, reduce the rock mass crushing strength, improve rock breaking efficiency, and reduce costs.

[0018] This invention separates the ultrasonic excitation device from the rock drilling rod, allowing for separate ultrasonic excitation and impact-induced rock breaking. This ensures effective rock excitation, promotes fracture development, and effectively reduces rock strength. Simultaneously, it significantly reduces high-frequency vibration friction of the impact drill rod, drastically lowering energy loss and operating temperature. Therefore, it breaks free from the constraints of existing ultrasonic drilling rig design, developing an auxiliary rock-breaking device based on ultrasonic excitation. This device combines ultrasonic excitation and drill rod impact to achieve efficient hard rock breaking, aligning with the development trend of modern drilling rigs. Attached Figure Description

[0019] Figure 1 This is a plan view of the ultrasonic excitation-assisted rock breaking device of the present invention; Figure 2 This is a three-dimensional schematic diagram of the ultrasonic excitation-assisted rock breaking device of the present invention; Figure 3 This is a schematic diagram of the hydraulic propulsion device of the present invention; Figure 4 This is a schematic diagram of the ultrasonic frequency modulation excitation device of the present invention.

[0020] In the diagram: 1—rock drill, 2—fastening device, 3—hydraulic propulsion device, 4—ring connector I, 5—ring connector II, 6—amplifier rod, 7—drill rod, 8—compacting ring, 9—high-frequency current input line, 10—detection frequency output line, 11—natural frequency analyzer, 12—ultrasonic generator, 13—hydraulic cylinder, 14—piston, 15—ring steel ring, 16—circuit control system, 17—ultrasonic transducer, 18—accelerometer. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings, but this does not limit the invention to the scope of the embodiments described.

[0022] The present invention includes a fastening device, a hydraulic propulsion device, a rock mass natural frequency detection system, and an ultrasonic excitation system; it is compatible with existing rock drills.

[0023] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The fastening device 2 is cylindrical in shape and is fitted onto the outside of the rock drill 1. It can be installed using clamps or by setting or installing a flange on the outside of the rock drill 1. The fastening device is installed on the outside of the rock drill 1 through the flange, thus completing the adaptation to the existing rock drill. The drill rod 7 passes through the middle of the fastening device 2.

[0024] The hydraulic propulsion device 3 is a ring-shaped hydraulic jack, including a hydraulic cylinder 13, a piston 14, and a ring-shaped steel ring 15. Specifically, the hydraulic cylinder 13 is a ring-shaped structure that cooperates with the fastening device 2, the piston 14 is also ring-shaped, and the top of the ring-shaped steel ring 15 is used to install or connect other components of the present invention. This structure is mainly to avoid affecting the operation of the drill rod 7.

[0025] The rock mass natural frequency detection system includes a ring connector I4, a piezoelectric accelerometer 18, a detection frequency output line 10, and a natural frequency analyzer 11. The ring connector I4 is mounted on a ring-shaped steel ring 15 and primarily serves to connect and assist in the installation of other components. An internal circuit control device is installed; the piezoelectric accelerometer 18 is electrically connected to the natural frequency analyzer 11 via the detection frequency output line 10.

[0026] The ultrasonic excitation system includes a ring connector II5, a compaction ring 8, an amplitude transformer 6, an ultrasonic generator 12, and a high-frequency current input line 9. The ring connector II5 is fixedly mounted on the ring connector I4. The ring connector II5 also serves to connect and assist in the installation of other components. Therefore, the ring connector I4 and the ring connector II5 can also be designed as a single piece.

[0027] The annular connector II5 contains a ring of uniformly arranged ultrasonic transducers 17. A compaction ring 8 is fixedly mounted on the annular connector II5 via amplitude transformers 6, the same number as the ultrasonic transducers 17. The bottom of each amplitude transformer 6 is connected to the corresponding ultrasonic transducer 17, allowing the ultrasonic transducers 17 to transmit ultrasonic energy to the amplitude transformer 6. As a further embodiment, the annular connector II5 has multiple mounting slots arranged in a ring. The ultrasonic transducers 17 are located at the bottom of these slots, and the amplitude transformers 6 are mounted on these slots. After amplifying the ultrasonic energy, the amplitude transformers 6 transmit the ultrasonic energy to the rock surface through the compaction ring 8.

[0028] The ultrasonic generator 12 is electrically connected to the circuit control device through the high-frequency current input line 9, and the circuit control device is electrically connected to the ultrasonic transducer 17. The piezoelectric accelerometer 18 is mounted on the ring connector II5. The piezoelectric accelerometer 18 monitors the vibration of the rock surface, detects the vibration signal of the rock, and feeds the vibration signal back to the natural frequency analyzer 11 for analysis of the natural frequency of the rock.

[0029] Furthermore, the ultrasonic generator 12 is a frequency-adjustable ultrasonic generator 12, which adjusts the emitted ultrasonic frequency according to the natural frequency of different rocks.

[0030] Preferably, there are 6 to 10 amplitude transformers 6; thereby ensuring that the ultrasonic waves are transmitted to the compaction ring 8 with higher efficiency.

[0031] Preferably, the hydraulic propulsion device 3 also includes a pressure sensor and a hydraulic control system. The pressure sensor is used to detect the force state of the piston 14, and the hydraulic control system controls the oil pressure of the hydraulic propulsion device 3 to ensure that the compaction ring 8 can always be pressed tightly against the rock surface with a certain pressure, while not interfering with the rock drill 1 drilling forward.

[0032] The auxiliary rock breaking device is cylindrical in shape. The drill rod 7 passes through the middle of the auxiliary rock breaking device. The fastening device 2 is fitted on the outside of the rock drill 1 and is fastened by clamps or other means to fix the auxiliary rock breaking device on the rock drill 1.

[0033] The hydraulic propulsion device 3 can apply thrust in the drilling direction. As the drilling depth increases, the piston 14 of the hydraulic propulsion device 3 contracts to ensure that the compaction ring 8 is tightly attached to the surface of the rock mass. The length of the piston 14 of the hydraulic propulsion device 3 meets the construction requirements of loading and unloading the drill rod 7 of the rock drill 1.

[0034] The rock drill 1 applies impact vibration to the rock mass through the drill rod 7. The rock mass vibration signal is transmitted to the piezoelectric accelerometer 18 through the compaction ring 8 and the amplitude transformer 6, and is converted into an electrical signal. The signal is then output to the natural frequency analyzer 11 through the detection frequency output line 10 to determine the natural frequency of the rock mass. The detection result is input to the adjustable frequency ultrasonic generator 12 to generate a corresponding high-frequency current. The current is input to the circuit control device through the high-frequency current input line 9.

[0035] The adjustable frequency ultrasonic generator 12 generates a high-frequency alternating current, which is input into multiple ultrasonic transducers 17 arranged in a ring through the circuit control system 16. The electrical signal is converted into a vibration signal, which is concentrated on the top compaction ring 8 through the amplitude transformer 6. The compaction ring 8 excites the construction rock mass over a wide range and with high power, promoting the development of internal fissures in the rock mass.

[0036] The method of using this invention is as follows: 1. The rock drill 1 is fixed to the construction area by the support structure. The fastening device 2 is fitted on the outside of the rock drill 1. The drill rod 7 passes through the middle of the fastening device 2. The auxiliary rock breaking device is fixed on the rock drill 1. The hydraulic propulsion device 3 injects fluid. The piston 14 extends so that the compaction ring 8 is tightly attached to the rock surface. The natural frequency analyzer 11 and the ultrasonic generator 12 are placed on the ground and connected to the high-frequency current input line 9 and the detection frequency output line 10. 2. Start the rock drill 1. The drill rod 7 applies impact vibration to the rock mass. The piezoelectric accelerometer 18 receives the vibration signal of the rock mass and converts it into an electrical signal, which is then input to the natural frequency analyzer 11 to determine the natural frequency of the rock mass. The ultrasonic generator 12 generates a corresponding high-frequency current based on the detection results. The ultrasonic transducer 17 converts the high-frequency current into high-frequency mechanical vibration. The amplitude transformer 6 amplifies the amplitude of the mechanical vibration. Finally, the high-frequency mechanical vibration is applied to the rock mass through the compaction ring 8, and the auxiliary rock breaking device begins to perform ultrasonic excitation on the rock mass. 3. During the construction of the rock drill 1, the hydraulic propulsion device 3 automatically retracts the piston rod 14 according to the drilling depth and the wear of the drill rod 7. At the same time, the hydraulic pressure is controlled to ensure that the compaction ring 8 is always in close contact with the rock mass. The rock mass natural frequency detection system detects the natural frequency of the rock mass in real time. The frequency of the output current of the adjustable ultrasonic generator 12 is adjusted in real time to provide a wide range of efficient excitation to the rock mass. Under the combined action of the rock drilling impact drill and ultrasonic excitation, efficient crushing of hard rock is achieved. 4. After the hard rock is broken, rotate the rock drill 1 to select a new rock breaking position. The piston 14 of the hydraulic propulsion device 3 extends, and the compaction ring 8 is pressed tightly against the rock mass. Repeat the construction steps in steps two and three. When the construction is completed, retract the piston 14, turn off the auxiliary rock breaking device and the rock drill 1 in sequence, remove the high-frequency current input line 9 and the detection frequency output line 10, loosen the clamp of the fastening device 2, remove the auxiliary rock breaking device from the rock drill 1, and tidy up the construction area.

[0037] Preferably, the hydraulic propulsion device 3 monitors the stress state of the piston rod 14 at a frequency of 20-40 times per minute, and adjusts the hydraulic pressure to ensure that the compaction ring 8 is always in close contact with the rock surface.

[0038] The beneficial effects of this invention are that the auxiliary rock-breaking device can be directly installed on existing drilling rigs via the fastening device 2, making it convenient to use; the rock drilling rod 7 and the ultrasonic excitation device are separated, so that the rock is subjected to ultrasonic excitation and the drill rod 7 impact action respectively. On the one hand, this greatly reduces the energy loss caused by the high-frequency vibration friction of the drill rod 7, and on the other hand, it avoids the excitation damage of the drill rod 7 by the ultrasonic waves; the auxiliary rock-breaking device has multiple ultrasonic transducers arranged in a ring, with a large ultrasonic excitation range and high power. The hydraulic propulsion device 3 makes the compaction ring 8 fit tightly against the rock mass, ensuring the excitation effect of the ultrasonic waves on the rock. This can effectively promote the development of fractures in large-volume rock masses, reduce the rock mass crushing strength, improve rock breaking efficiency, and reduce costs.

[0039] This invention separates the ultrasonic excitation device from the rock drilling rod 7, allowing for separate ultrasonic excitation and impact-induced rock breaking. This ensures effective rock excitation, promotes fracture development, and effectively reduces rock strength. Simultaneously, it significantly reduces high-frequency vibration friction of the impact drill rod 7, drastically lowering energy loss and operating temperature. Therefore, it breaks free from the constraints of existing ultrasonic drilling rig design concepts, developing an auxiliary rock-breaking device based on ultrasonic excitation on the existing rock drill 1. This device combines ultrasonic excitation and impact from the drill rod 7 to achieve efficient hard rock breaking, aligning with the development trend of modern drilling rigs.

Claims

1. An auxiliary rock-breaking device based on ultrasonic excitation, characterized in that, Includes fastening device (2), hydraulic propulsion device (3), rock mass natural frequency detection system and ultrasonic excitation system; The fastening device (2) is cylindrical in shape and is fitted around the outside of the rock drill (1). The drill rod (7) passes through the middle of the fastening device (2). The hydraulic propulsion device (3) includes an annular hydraulic cylinder (13), a piston (14) that cooperates with the hydraulic cylinder (13), and an annular steel ring (15) fixed to the front section of the piston (14); the hydraulic cylinder (13) is mounted on the fastening device (2); The rock mass natural frequency detection system includes a ring connector I (4), a piezoelectric accelerometer (18), a detection frequency output line (10), and a natural frequency analyzer (11); the ring connector I (4) is installed on the annular steel ring (15) and has a circuit control device (16) installed inside; the piezoelectric accelerometer (18) is electrically connected to the natural frequency analyzer (11) through the detection frequency output line (10); The ultrasonic excitation system includes a ring connector II (5), a compaction ring (8), an amplitude transformer (6), an ultrasonic generator (12), and a high-frequency current input line (9); the ring connector II (5) is fixedly installed on the ring connector I (4), and multiple ultrasonic transducers (17) are evenly arranged in a ring inside the ring connector II (5). The compaction ring (8) is fixedly installed on the ring connector II (5) through the same number of amplitude transformers (6) as the ultrasonic transducers (17), and the bottom of each amplitude transformer (6) is connected to the corresponding ultrasonic transducer (17). The ultrasonic generator (12) is electrically connected to the circuit control device (16) through the high-frequency current input line (9), and the circuit control device (16) is electrically connected to the ultrasonic transducer (17). The piezoelectric accelerometer (18) is mounted on the ring connector II (5).

2. The ultrasonic-excited assisted rock-breaking device according to claim 1, characterized in that, The ring connector I (4) and the ring connector II (5) are an integral structure.

3. The ultrasonic-excited assisted rock-breaking device according to claim 1, characterized in that, The ring connector II (5) has multiple mounting slots distributed in a ring. The ultrasonic transducer (17) is located at the bottom of the mounting slot, and the amplitude transformer (6) is installed on the mounting slot.

4. The ultrasonic-excited assisted rock-breaking device according to claim 2, characterized in that, The ultrasonic generator (12) is a frequency-adjustable ultrasonic generator.

5. The ultrasonic-excited assisted rock-breaking device according to claim 4, characterized in that, The number of amplitude rods (6) is 6 to 10.

6. The ultrasonic-excited assisted rock-breaking device according to claim 1, characterized in that, The hydraulic propulsion device (3) also includes a pressure sensor and a hydraulic control system. The pressure sensor is used to detect the force state of the piston (14), and the hydraulic control system controls the oil pressure of the hydraulic propulsion device (3).

7. A method of using the ultrasonic-excited auxiliary rock-breaking device as described in any one of claims 1 to 6, characterized in that, Includes the following steps:

1. Fix the rock drill (1) to the construction area through the support structure, put the fastening device (2) on the outside of the rock drill (1), pass the drill rod (7) through the middle of the fastening device (2), fix the auxiliary rock breaking device on the rock drill (1), inject fluid into the hydraulic propulsion device (3), extend the piston (14) so ​​that the compaction ring (8) is tightly attached to the rock surface, place the natural frequency analyzer (11) and ultrasonic generator (12) on the ground, and connect the high frequency current input line (9) and the detection frequency output line (10).

2. Start the rock drill (1), the drill rod (7) applies impact vibration to the rock mass, the piezoelectric accelerometer (18) receives the vibration signal of the rock mass and converts it into an electrical signal input to the natural frequency analyzer (11) to determine the natural frequency of the rock mass under construction, the ultrasonic generator (12) generates a corresponding high-frequency current according to the detection result, the ultrasonic transducer (17) converts the high-frequency current into high-frequency mechanical vibration, the amplitude transformer (6) amplifies the mechanical vibration amplitude, and finally the high-frequency mechanical vibration is applied to the rock mass under construction through the compaction ring (8), and the auxiliary rock breaking device begins to perform ultrasonic excitation on the rock mass under construction.

3. During the construction of the rock drill (1), the hydraulic propulsion device (3) automatically retracts the piston rod (14) according to the drilling depth and the wear of the drill rod (7). At the same time, the hydraulic pressure is controlled to ensure that the compaction ring (8) is always in close contact with the rock mass. The rock mass natural frequency detection system detects the natural frequency of the rock mass in real time. The frequency of the output current of the adjustable ultrasonic generator (12) is adjusted in real time to excite the rock mass in a wide range and efficiently. Under the combined action of the rock drill and ultrasonic excitation, the hard rock is efficiently broken.

4. After the hard rock is broken, rotate the rock drill (1) to select a new rock breaking position. The piston (14) of the hydraulic propulsion device (3) is extended and the compaction ring (8) is pressed against the rock mass. Repeat the construction steps of the second and third steps. When the construction is completed, retract the piston (14), turn off the auxiliary rock breaking device and the rock drill (1) in sequence, remove the high frequency current input line (9) and the detection frequency output line (10), loosen the clamp of the fastening device (2), remove the auxiliary rock breaking device from the rock drill (1), and tidy up the construction area.

8. The method of using the ultrasonic-excited auxiliary rock-breaking device according to claim 7, characterized in that, The hydraulic propulsion device (3) monitors the stress state of the piston (14) at a frequency of 20-40 times per minute, and adjusts the hydraulic pressure to ensure that the compaction ring (8) is always in close contact with the rock surface.

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