Microwave-assisted impact rock-breaking drilling tool and method suitable for deep hard rock formations

Abstract

The present invention discloses a microwave-assisted impact rock-breaking drill tool and method suitable for deep hard rock formations, which aims to use microwaves to pre-weaken hard rocks, so that rocks are easier to break under impact loads, and effectively solve the problem of drill bit wear. To this end, the microwave-assisted impact rock-breaking drill tool provided by the present application includes a hollow drill rod, a piston and a rock-breaking drill bit, the piston is slidably installed in the hollow drill rod, a waveguide is provided on the drilling surface of the rock-breaking drill bit, a pneumatic propulsion chamber is formed between the piston and the hollow drill rod, a propulsion baffle ring is provided on the piston, the propulsion direction of the pulse propulsion airflow is from back to front, and after the pulse propulsion airflow enters the rear pneumatic chamber, it will push the propulsion baffle ring together with the piston to move forward, so that the rock-breaking drill bit applies a pulse impact load to the rock mass, and a vortex tube is provided on the piston for converting the pulse propulsion airflow entering the front pneumatic chamber into a hot airflow and a cold airflow, and the cold airflow is guided to the drilling surface of the rock-breaking drill bit.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave-assisted impact rock breaking, and in particular relates to a microwave-assisted impact rock breaking drilling tool and method suitable for deep hard rock formations. Background Art

[0002] Crushing of deep hard rock formations is a prerequisite for deep engineering (such as mining of mineral resources, construction of nuclear waste disposal sites, and development of geothermal energy), and is also one of the key and difficult issues in underground rock engineering. Impact drills are commonly used tools for crushing hard rock formations, but engineering practice shows that the inefficiency and high wear of drill bits in deep mining are serious. On the one hand, traditional mining tools are inefficient in crushing deep high-hardness rocks; on the other hand, existing alloy drill bits cannot avoid wear during long-term work, but the development of harder and more wear-resistant tools has reached a bottleneck and is difficult to break through in a short period of time. In recent years, microwave rock breaking technology has been found to have the advantages of not introducing new media, low risk, easy shielding, and convenient energy transmission. As microwave rock breaking has received more and more attention, the theoretical and experimental support for its technical application has become more and more perfect, and it is considered to be one of the effective technical development paths for efficient crushing of hard rocks.

[0003] The characteristics of microwaves are as follows: (1) fast heating speed and high energy utilization rate; (2) instantaneous electronic control, which means that the microwave heating process is fast and flexible and can be remotely operated; (3) selectivity, which depends on the dielectric properties of the mineral components; (4) easy to shield and less derivative hazards. In the engineering application of microwave-assisted rock breaking, firstly, the input energy of microwaves is electrical energy, which is convenient for energy transmission compared with other technologies that rely on fuel for heating; secondly, microwaves are easy to generate and shield, especially microwaves can achieve full reflection on the surface of metal materials, and will not cause direct damage to the tool, so they are highly controllable; at the same time, microwaves have strong penetrability and can achieve large-scale rock damage in front of the rock breaking tool. There is no sequence of microwave pre-damage and rock breaking process, so there is hope to achieve continuous rock crushing.

[0004] In addition, the temperature sensitivity of rock mechanical strength is an important reason for the application of microwave-assisted rock breaking and rock crushing. Specifically, the ground temperature generally increases with the depth at a gradient of 25-30℃ / km. The current mine depth has reached more than 4000m, and the ground temperature is more than 100℃. Generally, rocks begin to weaken significantly at 200℃. Therefore, microwave-based thermal rock breaking technology can make rocks reach a weakening temperature with less energy. In summary, the above characteristics of microwaves are very consistent with the needs of deep hard rock crushing. However, the existing microwave-assisted rock breaking technology is mainly concentrated in microwave-assisted TBM cutter rock breaking, microwave-assisted ore grinding, microwave-assisted drilling fracturing, microwave-assisted cutting and other static load-based rock breaking technologies. The design and application of microwaves in the field of impact rock breaking technology has not been reported. Summary of the invention

[0005] The main purpose of the present invention is to provide a microwave-assisted impact rock-breaking drill tool and method suitable for deep hard rock formations. The impact rock-breaking drill tool uses microwaves to pre-weaken hard rock, making the rock easier to break under impact loads, effectively solving the problem of drill bit wear and improving drilling efficiency.

[0006] To this end, an embodiment of the present application provides a microwave-assisted impact rock-breaking drill tool suitable for deep hard rock formations, comprising a hollow drill rod, a piston and a rock-breaking drill bit, wherein the piston is slidably installed in the hollow drill rod and extends from the front end of the hollow drill rod to be connected to the rock-breaking drill bit, and an open waveguide is provided on the drilling surface of the rock-breaking drill bit;

[0007] A pneumatic propulsion chamber is formed between the piston and the hollow drill rod, a propulsion baffle ring is provided on the piston, the propulsion baffle ring divides the pneumatic propulsion chamber into a front pneumatic chamber and a rear pneumatic chamber, an air flow gap exists between the propulsion baffle ring and the pneumatic propulsion chamber, and the propulsion direction of the pulse propulsion airflow is from back to front;

[0008] After the pulse propulsion airflow enters the rear air pressure chamber, it will push the propulsion baffle ring together with the piston to move forward, so that the rock breaking drill bit applies a pulse impact load to the rock mass, and then enters the front air pressure chamber from the air flow gap;

[0009] The piston is provided with a vortex tube for converting the pulse propulsion airflow entering the front air pressure chamber into a hot airflow and a cold airflow, and the cold airflow is guided to the drilling surface of the rock breaking drill bit.

[0010] Specifically, a drill exhaust hole is provided inside the rock breaking drill bit. After the cold air flows through the drill exhaust hole and is guided to the drilling surface of the rock breaking drill bit, the broken rock debris is discharged back to the ground along the slag discharge channel at the edge of the rock breaking drill bit.

[0011] Specifically, a pressure equalizing ring is provided on the rock breaking drill bit.

[0012] Specifically, the drilling surface of the rock breaking drill bit is provided with drilling teeth.

[0013] Specifically, an air hole connecting the front air pressure chamber and the air inlet of the vortex tube is opened on the side wall of the piston.

[0014] Specifically, the rear end surface of the propulsion retaining ring is an inclined surface facing forward and outward.

[0015] Specifically, an annular groove for limiting the movement stroke of the piston is provided on the inner wall of the pneumatic propulsion chamber, and the propulsion retaining ring extends into the annular groove.

[0016] Specifically, a thrust stopper for buffering the rebound of the piston is fixedly provided in the hollow drill rod.

[0017] Specifically, the piston and the thruster are provided with a reflux channel connected to each other for reflux of the hot gas flow.

[0018] A microwave-assisted impact rock breaking method, using the microwave-assisted impact rock breaking drill tool to break rocks, characterized by comprising:

[0019] An open waveguide is used to continuously output heating microwaves to the rock mass in front of the rock breaking drill bit, thereby heating the rock mass in front and damaging and weakening the rock mass;

[0020] The pulse propulsion air flow is injected into the rear air pressure chamber through the drill pipe, pushing the propulsion baffle ring to drive the piston to move forward, so that the rock breaking drill bit applies a pulse impact load to the weakened rock mass, and then enters the front air pressure chamber from the air flow gap;

[0021] The pulse propulsion airflow entering the front pressure chamber flows into the vortex tube. The high-pressure vortex tube separates the pulse propulsion airflow at room temperature into hot airflow and cold airflow. The cold airflow is guided to the drilling surface of the rock breaking drill bit to intermittently cool the rock mass at a certain frequency, causing fatigue damage to the rock mass.

[0022] The drill bit rebounds after impacting and cutting the rock mass, driving the piston and the thrust retaining ring to move backward and reset;

[0023] Repeat the above process until all rock masses are broken.

[0024] Compared with the prior art, at least one embodiment of the present invention has the following beneficial effects: the microwave-assisted impact rock-breaking drill, on the one hand, the microwave waveguide on the drill bit can continuously output microwave radiation to damage and weaken the rock mass; on the other hand, the vortex tube outputs a cold air flow toward the drill bit, intermittently cooling the rock mass at a certain frequency, so that the rock mass produces fatigue damage under the alternating action of cold and heat, thereby promoting the crushing of the rock under the impact load of the drill.

[0025] In summary, the present application integrates microwave-assisted fracturing, cutting, and impact rock breaking technologies. The microwave-assisted rock breaking technology weakens the hard rock in advance, making it easier to break under impact loads. It is a very potential solution to effectively solve the problem of drill bit wear and improve drilling efficiency. Moreover, the power source only needs to be provided by a pulsed propulsion airflow, which is of fundamental significance for the efficient crushing of deep hard rock formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 Schematic diagram of the structure of a microwave-assisted impact rock-breaking drill tool provided in an embodiment of the present invention;

[0028] Among them: 1. hollow drill rod; 2. piston; 3. rock breaking drill bit; 4. pulse propulsion airflow; 5. open waveguide; 6. front air pressure chamber; 7. rear air pressure chamber; 8. propulsion baffle ring; 9. hot airflow; 10. cold airflow; 11. vortex tube; 12. drill bit exhaust hole; 13. equalizing ring; 14. drill tooth; 15. thruster; 16. return flow channel; 17. annular groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] See also Figure 1A microwave-assisted impact rock-breaking drilling tool suitable for deep hard rock formations comprises a hollow drill rod 1, a piston 2 and a rock-breaking drill bit 3. The piston 2 is slidably installed in the hollow drill rod 1 and extends from the front end of the hollow drill rod 1 to be connected with the rock-breaking drill bit 3. An open waveguide 5 is provided on the drilling surface of the rock-breaking drill bit 3. An air pressure propulsion chamber is formed between the piston 2 and the hollow drill rod 1. A propulsion baffle ring 8 is provided on the piston 2. The propulsion baffle ring 8 divides the air pressure propulsion chamber into a front air pressure chamber 6 and a rear air pressure chamber 7. There is an air flow gap between the propulsion baffle ring 8 and the air pressure propulsion chamber, and the pulse propulsion air flow 4 is propulsed in a direction from back to front. After the pulse propulsion airflow 4 enters the rear air pressure chamber 7, it will push the propulsion baffle ring 8 together with the piston 2 to move forward, so that the rock breaking drill bit 3 applies a pulse impact load to the rock mass, and then enters the front air pressure chamber 6 from the air flow gap. The piston 2 is provided with a vortex tube 11 for converting the pulse propulsion airflow 4 entering the front air pressure chamber 6 into a hot airflow 9 and a cold airflow 10. The cold airflow 10 is guided to the drilling surface of the rock breaking drill bit 3. The open waveguide 5 embedded in the rock breaking drill bit 3 is connected to an external microwave generating device through a coaxial cable.

[0033] The process of rock breaking using the microwave-assisted impact rock breaking drill tool is as follows:

[0034] Step 1: Use the open waveguide 5 to continuously output heating microwaves to the rock mass in front of the rock breaking drill bit 3 to heat the rock mass in front so as to damage and weaken the rock mass;

[0035] Step 2: Then, a pulse propulsion airflow 4 of a set frequency is injected into the rear air pressure chamber 7 through the drill pipe, thereby pushing the propulsion baffle ring 8 to drive the piston 2 to move forward, so that the rock breaking drill bit 3 hits the weakened rock, exerts a pulse impact load on the rock, and then enters the front air pressure chamber 6 from the airflow gap;

[0036] Step 3: The pulse propulsion airflow 4 entering the front air pressure chamber 6 further flows into the vortex tube 11. The high-pressure vortex tube 11 separates the pulse propulsion airflow 4 at room temperature into a hot airflow 9 and a cold airflow 10. The cold airflow 10 is guided to the drilling surface of the rock breaking drill bit 3 to intermittently cool the rock mass at a certain frequency, so that the rock mass produces fatigue damage under the alternating action of hot and cold.

[0037] Step 4: The drill bit impacts and cuts the rock mass and then rebounds, driving the piston and the thrust retaining ring to move backward and reset;

[0038] Step 5: Repeat the above process until all rock masses are broken.

[0039] The microwave-assisted impact rock-breaking drill provided in this embodiment, on the one hand, the microwave waveguide on the drill bit can continuously output microwave radiation to damage and weaken the rock mass; on the other hand, the vortex tube 11 outputs a cold air flow 10 in the direction of the drill bit, intermittently cools the rock mass at a certain frequency, so that the rock mass produces fatigue damage under the alternating action of cold and heat, thereby promoting the crushing of the rock under the impact load of the drill bit.

[0040] The present application integrates microwave-assisted fracturing and cutting-impact rock-breaking technology. The microwave-assisted rock-breaking technology weakens the hard rock in advance, making it easier to break under impact load. It is a very potential solution to effectively solve the problem of drill bit wear and improve drilling efficiency. Moreover, the power source only needs to be provided by the pulse propulsion airflow 4, which is of fundamental significance for the efficient crushing of deep hard rock formations.

[0041] See also Figure 1 Specifically, the piston 2 is directly connected to the rock breaking drill bit 3, and the rock breaking drill bit 3 is contained in the hollow drill rod 1 and can slide freely. The piston 2 is connected to the vortex tube 11 at the connection. The vortex tube 11 contains a threaded flow channel. The streamline of the airflow is converted from a straight line to a spiral streamline. The vortex tube 11 is embedded in the connection between the piston 2 and the rock breaking drill bit 3. The vortex tube 11 can separate the pulse propulsion airflow 4 flowing in through the outside of the piston 2 into cold and hot airflows. The hot airflow 9 flows back through the inside of the piston 2, and the cold airflow 10 flows out through the internal cavity and exhaust hole of the rock breaking drill bit 3.

[0042] See also Figure 1 In some embodiments, a drill exhaust hole 12 is provided inside the rock-breaking drill bit 3, and a slag discharge channel is provided on the outer wall of the rock-breaking drill bit 3. The cold air flow 10 is guided to the drilling surface of the rock-breaking drill bit 3 through the drill exhaust hole 12 to intermittently cool the rock mass in front, and then the broken rock slag is discharged back to the ground along the slag discharge channel at the edge of the rock-breaking drill bit 3. In this embodiment, the driving of the piston 2, the cooling of the rock-breaking drill bit 3 and the slag discharge are all achieved by a single pulse propulsion airflow 4, without the need to add other mechanisms, and the entire drilling tool has a simple structure and low cost.

[0043] See also Figure 1 It is understandable that, in actual design, a pressure equalizing ring 13 is also provided on the rock breaking drill bit 3. The pressure equalizing ring 13 contained in the rock breaking drill bit 3 can maintain the stability of the electric field on the drill bit surface, and prevent the plasma discharge generated by the tip discharge in the microwave field from damaging the drill bit. In addition, in order to improve the rock breaking efficiency, drill teeth 14 are evenly distributed on the drilling surface of the rock breaking drill bit 3.

[0044] See also Figure 1In other embodiments, the rear end face of the propulsion baffle ring 8 can be designed as an inclined surface facing forward and outward, and the propulsion direction of the pulse propulsion airflow 4 is horizontal propulsion from back to front. Such a design allows the pulse propulsion airflow 4 to smoothly enter the airflow gap under the guidance of the inclined surface after impacting the propulsion baffle ring 8. In addition, an air hole that connects the front air pressure chamber 7 and the air inlet of the vortex tube 11 can also be opened on the side wall of the piston 2 in the front air pressure chamber 7.

[0045] See also Figure 1 In other embodiments, a thrust stopper 15 for buffering the rebound of the piston 2 is fixedly provided in the hollow drill rod 1, the tail end of the piston 2 is matched and slidably assembled in the sliding cavity at the front end of the thrust stopper 15, an energy-absorbing buffer pad is provided at the bottom of the sliding cavity, a certain gap is left between the thrust stopper 15 and the hollow drill rod 1, a certain gap is left between the piston 2 and the hollow drill rod 1, a reflux channel 16 connected to the reflux of the hot air flow 9 is provided in the piston 2 and the thrust stopper 15, after the drill bit impacts and cuts the rock, it rebounds and hits the piston 2, the piston 2 rebounds to the thrust stopper 15, and is stopped by absorbing the energy of the energy-absorbing buffer pad, which can effectively avoid damage caused by the piston 2 directly colliding with the hollow drill rod 1 due to excessive rebound force.

[0046] See also Figure 1 In other embodiments, an annular groove 17 for limiting the movement stroke of the piston 2 is provided on the inner wall of the pneumatic propulsion chamber, and the propulsion baffle ring 8 extends into the annular groove 17. The propulsion baffle ring 8 is limited by the annular groove 17, which can prevent the piston 2 from slipping out of the hollow drill rod 1 or being reset in transition.

[0047] The specific process of using the microwave-assisted impact rock breaking drill tool to break rock is as follows:

[0048] Step 1: microwaves are generated on the ground and transmitted to the open waveguide 5 via a coaxial cable to heat the rock mass in front of the drill bit, thereby damaging and weakening the rock mass in front of the drill bit;

[0049] Step 2: Inject the pulse propulsion airflow 4 into the front air pressure chamber 6 through the drill pipe, thereby pushing the propulsion baffle ring 8 to drive the piston 2 to move forward, so that the rock breaking drill bit 3 applies an impact load to the weakened rock, and then enters the front air pressure chamber 6 from the airflow gap;

[0050] Step 3: The pulse propulsion airflow 4 entering the rear air pressure chamber 7 flows into the vortex tube 11. The high-pressure vortex tube 11 separates the pulse propulsion airflow 4 at room temperature into a hot airflow 9 and a cold airflow 10. The hot airflow 9 flows back along the return channel 16 in the piston 2 and the thruster 15, and the cold airflow 10 cools down the rock mass in front through the drill bit exhaust hole 12, and then discharges the broken rock debris back to the ground along the slag discharge channel at the edge of the rock breaking drill bit 3;

[0051] Step 4: After the drill bit impacts and cuts the rock, it rebounds and hits the piston 2, and the piston 2 rebounds to the thrust stopper 15 and stops;

[0052] Step 5: Repeat the above steps until all rock masses are broken.

[0053] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0054] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0055] In addition, the terms used in any technical solution disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them unless otherwise stated. Any component provided by the present invention may be assembled from multiple separate components or may be a separate component manufactured by an integrated molding process.

[0056] The above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A microwave-assisted impact rock-breaking drill suitable for deep hard rock formations, characterized by: The invention comprises a hollow drill rod (1), a piston (2) and a rock breaking drill bit (3); the piston (2) is slidably mounted in the hollow drill rod (1), and extends from the front end of the hollow drill rod (1) to be connected to the rock breaking drill bit (3); an open waveguide (5) is provided on the drilling surface of the rock breaking drill bit (3); A pneumatic propulsion chamber is formed between the piston (2) and the hollow drill rod (1), and a propulsion baffle ring (8) is provided on the piston (2). The propulsion baffle ring (8) divides the pneumatic propulsion chamber into a front pneumatic chamber (6) and a rear pneumatic chamber (7). An airflow gap exists between the propulsion baffle ring (8) and the pneumatic propulsion chamber, and the propulsion direction of the pulse propulsion airflow (4) is from back to front. After the pulse propulsion airflow (4) enters the rear air pressure chamber (7), it pushes the propulsion baffle ring (8) together with the piston (2) to move forward, so that the rock breaking drill bit (3) applies a pulse impact load to the rock mass, and then enters the front air pressure chamber (6) through the airflow gap; The piston (2) is provided with a vortex tube (11) for converting the pulse propulsion airflow (4) entering the front air pressure chamber (6) into a hot airflow (9) and a cold airflow (10), and the cold airflow (10) is guided to the drilling surface of the rock breaking drill bit (3).

2. The microwave-assisted impact rock-breaking drilling tool according to claim 1, characterized in that: The rock breaking drill bit (3) is provided with a drill bit exhaust hole (12) inside, and after the cold air flow (10) is guided to the drilling surface of the rock breaking drill bit (3) through the drill bit exhaust hole (12), the broken rock debris is discharged back to the ground along the slag discharge channel at the edge of the rock breaking drill bit (3).

3. The microwave-assisted impact rock-breaking drilling tool according to claim 2, characterized in that: The rock breaking drill bit (3) is provided with a pressure equalizing ring (13).

4. The microwave-assisted impact rock-breaking drilling tool according to claim 3, characterized in that: The rock breaking drill bit (3) is provided with drill teeth (14) on its drilling surface.

5. The microwave-assisted impact rock-breaking drilling tool according to claim 1, characterized in that: An air hole is provided on the side wall of the piston (2) for connecting the front air pressure chamber (6) and the air inlet of the vortex tube (11).

6. The microwave-assisted impact rock-breaking drilling tool according to claim 1, characterized in that: The rear end surface of the thrust retaining ring (8) is an inclined surface facing forward and outward.

7. The microwave-assisted impact rock-breaking drilling tool according to claim 1, characterized in that: A thrust stopper (15) for buffering the rebound of the piston (2) is also fixedly provided in the hollow drill rod (1).

8. The microwave-assisted impact rock-breaking drilling tool according to claim 7, characterized in that: The piston (2) and the thruster (15) are provided with a reflux channel (16) communicating with each other for reflux of the hot air flow (9).

9. The microwave-assisted impact rock-breaking drill according to any one of claims 1 to 8, characterized in that: An annular groove (17) for limiting the movement stroke of the piston (2) is provided on the inner wall of the pneumatic propulsion chamber, and the propulsion blocking ring (8) extends into the annular groove (17).

10. A microwave-assisted impact rock breaking method, using the microwave-assisted impact rock breaking drill tool according to any one of claims 1 to 9 to break rock, characterized in that: include: The open waveguide (5) is used to continuously output heating microwaves to the rock mass in front of the rock breaking drill bit (3), thereby heating the rock mass in front and damaging and weakening the rock mass; The pulse propulsion airflow (4) is injected into the rear air pressure chamber (7) through the drill pipe, pushing the propulsion baffle ring (8) to drive the piston (2) to move forward, so that the rock breaking drill bit (3) applies a pulse impact load to the weakened rock mass, and then enters the front air pressure chamber (6) through the airflow gap; The pulse propulsion airflow (4) entering the front air pressure chamber (6) flows into the vortex tube (11). The high-pressure vortex tube (11) separates the pulse propulsion airflow (4) at room temperature into a hot airflow (9) and a cold airflow (10). The cold airflow (10) is guided to the drilling surface of the rock breaking drill bit (3) to intermittently cool the rock mass at a certain frequency, causing fatigue damage to the rock mass. The rock breaking drill bit (3) impacts and cuts the rock mass and then rebounds, driving the piston (2) and the thrust retaining ring (8) to move backward and reset; Repeat the above process until all rock masses are broken.

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