A rock breaking device

Abstract

The present application provides a rock breaking device, including: an access part, connected to a fluid supply device and a compression part, including an upper joint, in which an input flow channel is arranged; the compression part, connected to the upper joint and the output part, including an outer cylinder, in which a jet element, a motion mechanism with reciprocating motion capability and a boosting mechanism connected in sequence are arranged, and the boosting mechanism includes a turbine group, and the turbine group includes a turbine compression chamber and a booster turbine arranged in the turbine compression chamber; the output part, connected to the outer cylinder, including a lower joint, in which a leakage flow channel, an output flow channel and a drill bit with a nozzle are arranged. Therefore, the present application utilizes a motion mechanism with a reciprocating function and cooperates with a booster turbine for fluid supercharging, realizes a jet-based rock breaking method, avoids direct force between the drill bit and the rock, improves the rock breaking speed, and reduces the wear of the drill bit.

Description

Technical Field

[0001] The present application relates to the field of drilling technology, and in particular to a rock breaking device. Background Art

[0002] During the drilling process of deep and ultra-deep wells, the plastic strength of rock increases with depth, strengthening its ability to resist damage. This requires the drill bit to consume more energy and time to break the rock, which directly leads to a decrease in mechanical penetration rate (ROP), and thus a decrease in drilling efficiency. Furthermore, the drill bit's constant friction and crushing of the hard rock also causes significant wear. Therefore, the development of a high-speed, low-loss rock breaking device has become an urgent issue. Summary of the Invention

[0003] In order to solve the above technical problems, the present application provides a rock breaking device.

[0004] According to a first aspect of the present application, a rock breaking device is provided, comprising: an access portion, connected to a fluid supply device and a compression portion, comprising an upper joint, in which an input flow channel is provided; the compression portion, connected to the upper joint and the output portion, comprising an outer cylinder, in which a jet element, a motion mechanism with reciprocating motion capability and a boosting mechanism connected in sequence are provided, the boosting mechanism comprising a turbine group, the turbine group comprising a turbine compression chamber and a booster turbine provided in the turbine compression chamber; the output portion, connected to the outer cylinder, comprising a lower joint, in which a discharge flow channel, an output flow channel and a drill bit with a nozzle are provided.

[0005] According to one embodiment of the present application, the boost turbine includes multiple groups of blades arranged from large to small, two connected groups of blades are alternately rotatable, and the front end of each blade is thicker than the rear end.

[0006] According to one embodiment of the present application, the boost mechanism further includes a high-pressure output spiral tube, which is connected to the turbine group, and has a rotating thread in the high-pressure output spiral tube that rotates in the same direction as the boost turbine.

[0007] According to one embodiment of the present application, the jet element includes a jet channel, which is connected to the input channel and includes a first switching channel and a second switching channel; the motion mechanism includes an inner cylinder, a piston group is provided at the center of the inner cylinder, and the piston group includes an input piston cylinder, an output piston cylinder, a piston rod, an input piston, an output piston and a combination valve; one end of the piston rod is connected to the input piston, and the other end is connected to the output piston; the input piston seal is provided in the input piston cylinder, dividing the input piston cylinder into an upper chamber of the input piston cylinder and a lower chamber of the input piston cylinder, and the upper chamber of the input piston cylinder is connected to the first switching channel; the output piston is provided in the output piston cylinder, and the output piston cylinder is connected to the boosting mechanism; the combination valve is respectively connected to the lower chamber of the input piston cylinder, the second switching channel and the leakage channel.

[0008] According to one embodiment of the present application, the combination valve is a two-position three-way combination valve, the valve core of the combination valve is connected to the input piston, the inlet is connected to the lower chamber of the input piston cylinder, and the channel is connected to the second switching channel and the leakage channel respectively.

[0009] According to one embodiment of the present application, the rock breaking device further includes a throttle valve, which is arranged between the lower chamber of the input piston cylinder and the second switching flow channel.

[0010] According to one embodiment of the present application, the rock breaking device further includes a one-way valve, one end of which is connected to the lower chamber of the input piston cylinder, and the other end of which is connected to the fluid supply device.

[0011] According to one embodiment of the present application, the input piston cylinder, the output piston cylinder and the inner cylinder are sealed by a sealing ring.

[0012] According to one embodiment of the present application, the cross-sectional area of ​​the input piston is larger than that of the output piston.

[0013] According to one embodiment of the present application, the working mode of the combination valve includes a first working mode and a second working mode; when the working mode of the combination valve is the first working mode, the channel in the combination valve connected to the second switching flow channel is closed, and the channel connected to the leakage flow channel is opened; when the working mode of the combination valve is the second working mode, the channel in the combination valve connected to the second switching flow channel is opened, and the channel connected to the leakage flow channel is closed.

[0014] The embodiment of the present application provides a rock breaking device, which receives fluid through an input flow channel of the access part by providing an access part, a compression part and an output part, and pressurizes and increases the speed of the fluid by cooperating with the jet element, the motion mechanism and the boost turbine in the boost mechanism of the compression part. Finally, the output flow channel of the output part and the drill bit carrying the nozzle are coordinated to realize a jet-based rock breaking method, thereby avoiding direct force between the drill bit and the rock, improving the rock breaking speed and reducing drill bit wear.

[0015] It should be understood that the teachings of this application do not necessarily achieve all of the beneficial effects described above, but that specific technical solutions can achieve specific technical effects, and other embodiments of this application can also achieve beneficial effects not mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an illustrative and non-limiting manner, in which:

[0017] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.

[0018] Figure 1 A schematic diagram of the structure of a rock breaking device according to an embodiment of the present application is shown;

[0019] Figure 2 A schematic structural diagram of a booster turbine of a rock breaking device according to an embodiment of the present application is shown;

[0020] Figure 3 A schematic structural diagram of a high-pressure output spiral tube of a rock breaking device according to an embodiment of the present application is shown.

[0021] Figure markings: 100, access part; 200, compression part; 300, output part; 1, upper joint; 2, outer cylinder; 3, jet element; 4, input piston cylinder; 5, input piston; 6, piston rod; 7, combination valve; 8, output piston cylinder; 9, output piston; 10, supercharger turbine; 11, high-pressure output spiral tube; 12, one-way valve; 13, throttle valve; 14, lower joint; A, input flow channel; B, second switching flow channel; C, first switching flow channel; D, turbine compression chamber; E, leakage channel; F, output flow channel. DETAILED DESCRIPTION

[0022] The principles and spirit of the present application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided solely to enable those skilled in the art to better understand and implement the present application, and are not intended to limit the scope of the present application in any way. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] The technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 A schematic diagram of the composition structure of the rock breaking device according to an embodiment of the present application is shown.

[0025] refer to Figure 1 The rock breaking device of the embodiment of the present application includes an access part 100, a compression part 200 and an output part 300.

[0026] The access portion 100 includes an upper connector 1, which is provided with an input channel A, connected to the fluid supply device and the compression portion 200, and is used to transmit the fluid provided by the fluid supply device to the compression portion 200 based on the input channel A;

[0027] The compression part 200 is connected to the upper joint 1 and the output part 300 respectively, and includes an outer cylinder 2. The outer cylinder 2 is provided with a jet element 3, a motion mechanism and a supercharging mechanism. The supercharging mechanism includes a turbine group, which includes a turbine compression chamber D and a supercharging turbine 10 arranged in the turbine compression chamber D. The jet element 3, motion mechanism and supercharging mechanism of the compression part 200 are the main parts of the rock breaking device, which are used to convert the fluid connected to the access part 100 based on the fluid supply device into a jet based on the jet element 3, and periodically compress the jet based on the cyclic reciprocating motion of the motion mechanism and the supercharging turbine 10 to obtain a high-pressure jet for rock breaking, and transmit the high-pressure jet to the output part 300.

[0028] The output part 300 is connected to the compression part 200 and includes a lower joint 14. The lower joint 14 is provided with a discharge flow channel E, an output flow channel F and a drill bit with a nozzle. The lower joint 14 is used to discharge flow based on the discharge flow channel E, and when rock breaking is required, the high-pressure jet generated by the compression part 200 is ejected through the nozzle of the drill bit based on the output flow channel F.

[0029] Specifically, the fluid supply device is used to provide fluid, and the fluid usually refers to drilling fluid. By connecting the access part 100 of the rock breaking device with the fluid supply device, when the fluid supply device outputs the fluid in a controlled manner, the fluid flows into the input flow channel A of the access part 100, and the input flow channel A introduces the fluid into the compression part 200. The compression part 200 can be controlled to perform jet conversion based on the jet element 3 to obtain a high-speed jet, and to supercharge the jet based on the motion mechanism and the supercharging mechanism to obtain a high-pressure jet, so that when breaking rock, a high-pressure and high-speed jet can be output from the drill bit nozzle to assist in rock breaking, thereby realizing a jet-based rock breaking method, improving the rock breaking speed, and reducing drill bit wear.

[0030] In one embodiment of the present application, the upper joint 1 and the outer cylinder 2 as well as the outer cylinder 2 and the lower joint 14 are connected by threads.

[0031] In one embodiment of the present application, the jet element 3 is a bistable jet element, and the jet element 3 includes a jet channel, which is connected to the input channel A and includes a first switching channel C and a second switching channel B;

[0032] The motion mechanism includes an inner cylinder, and a piston group is arranged at the center of the inner cylinder. The piston group includes an input piston cylinder 4, an output piston cylinder 8, a piston rod 6, an input piston 5, an output piston 9 and a combination valve 7; one end of the piston rod 6 is connected to the input piston 5, and the other end is connected to the output piston 9; the input piston 5 is sealed and arranged in the input piston cylinder 4, dividing the input piston cylinder 4 into an upper chamber of the input piston cylinder (excluding the chamber of the piston rod 6) and a lower chamber of the input piston cylinder (including the chamber of the piston rod 6); the upper chamber of the input piston cylinder is connected to the first switching flow channel C; the output piston 9 is arranged in the output piston cylinder 8, and the output piston cylinder 8 is connected to the boosting mechanism; the combination valve 7 is respectively connected to the lower chamber of the input piston cylinder, the second switching flow channel B and the discharge flow channel E.

[0033] In one embodiment of the present application, the combination valve 7 is a two-position three-way combination valve, the valve core of the combination valve 7 is connected to the input piston 5, the inlet is connected to the lower chamber of the input piston cylinder, and the channels are connected to the second switching channel B and the leakage channel E respectively.

[0034] Specifically, the inlet of the combination valve 7 is connected to the lower chamber of the input piston cylinder, and the channel is connected to the second switching channel B and the leakage channel E respectively. Based on the combination valve 7, the channel control between the lower chamber of the input piston cylinder and the second switching channel B can be realized, and the channel control between the lower chamber of the input piston cylinder and the leakage channel E can be realized.

[0035] In one embodiment of the present application, the rock breaking device further includes a throttle valve 13 , which is disposed between the lower chamber of the input piston cylinder and the second switching flow channel B.

[0036] Specifically, the throttle valve 13 is disposed between the lower chamber of the input piston cylinder and the second switching flow channel B. The pressure in the lower chamber of the input piston cylinder can be controlled by controlling the throttle valve 13. For example, the fluid pressure in the lower chamber of the input piston cylinder can be lower than that in the upper chamber of the input piston cylinder due to the action of the throttle valve 13.

[0037] In one embodiment of the present application, the rock breaking device further includes a one-way valve 12 , one end of the one-way valve 12 is connected to the lower chamber of the input piston cylinder, and the other end is connected to the fluid supply device.

[0038] Specifically, by arranging the one-way valve 12 between the fluid supply device and the lower chamber of the input piston cylinder, it is possible to obtain fluid from the fluid supply device for flow replenishment based on the control of the one-way valve 12 .

[0039] In one embodiment of the present application, the outer cylinder 2 is connected to the inner cylinder based on threads, and the input piston cylinder 4 and the output piston cylinder 8 are sealed to the inner cylinder via sealing rings.

[0040] Specifically, the outer cylinder 2 is connected to the inner cylinder through threads and positioned using a retaining spring. The input piston cylinder 4 and the output piston cylinder 8 are sealed with sealing rings at the upper and lower joints of the inner cylinder respectively.

[0041] In one embodiment of the present application, the cross-sectional area of ​​the input piston 5 is larger than that of the output piston 9 .

[0042] Specifically, the input piston 5 may be configured to be larger than the output piston 9 so as to achieve pulse supercharging based on the area difference between the large and small pistons.

[0043] In one embodiment of the present application, the jet element 3 is installed above the input piston cylinder 4 through a sleeve.

[0044] In one embodiment of the present application, the main parameter of the outer cylinder 2 is the connection buckle type.

[0045] Specifically, a suitable buckle shape can ensure connection strength and meet the requirements of the rock breaking device combination. Therefore, to ensure the connection strength of the rock breaking device, improve the convenience of installation and maintenance, expand the scope of application, and enhance overall performance, the main parameters of the outer cylinder 2 can be designed to be buckle-shaped. Preferably, the main body buckle shape of the rock breaking device can be 521 / 520, and the joint buckle shape can be 430, with an outer diameter of 182mm.

[0046] In one embodiment of the present application, the rock breaking device of this embodiment is preferably suitable for drilling wells with a diameter greater than 215.9 mm. The designed pressure increase ratio can be configured to be greater than 7:1, the input displacement can be 20 L / s, the output displacement can be configured to be greater than 1 L / s, the output pressure drop can be configured to be 60 MPa, and the jet pulsation output frequency can be configured to be 3 Hz. It should be noted that the specific values ​​of the above parameters are not specifically limited in this application, but are only preferred. As long as the parameter settings can meet the rock breaking requirements, they are within the scope of protection of this application.

[0047] Figure 2 A schematic structural diagram of a booster turbine of a rock breaking device according to an embodiment of the present application is shown.

[0048] refer to Figure 2 In one embodiment of the present application, the supercharger turbine 10 includes multiple groups of blades arranged from large to small, each group of blades is the same size, two connected groups of blades are alternately rotatable, and the front end of each blade is thicker than the rear end.

[0049] Specifically, the supercharger turbine 10 is composed of multiple groups of blades, which are arranged from large to small. Each group of blades is composed of multiple blades and the multiple blades have the same diameter. The front end of each blade is thicker than the rear end, that is, the shape of the blade is similar to the shape of an airplane wing with a thick front and thin back structure. Moreover, in the multiple groups of blades arranged from large to small, every two adjacent groups of blades are configured to rotate alternately, that is, the first group is rotatable blades, the second group is non-rotatable, the third group is rotatable, the fourth group is non-rotatable, and so on. Therefore, based on the blades with a front-thick and back-thin structure similar to the shape of an airplane wing, when the fluid passes through the rotatable blade group, it can first form a flow velocity difference on the upper and lower surfaces of the blades through the thick front end, thereby driving the blades to rotate, superimposing the impact force of the fluid, and further increasing the kinetic energy of the fluid. Then, combined with the alternating rotatable design, the non-rotatable blades are used to guide the fluid to the next rotatable blade group, driving the next blade to move, further increasing the kinetic energy, and so on.

[0050] In one embodiment of the present application, to accommodate the large-to-small configuration of the turbocharger 10 and to ensure the kinetic energy of the jet transmitted from the compression section 200 and avoid kinetic energy loss, the diameter of the turbine compression chamber D where the turbocharger 10 resides is also designed to have a large inlet and a small outlet. The inlet of the turbocharger 10 is connected to the output piston cylinder 8.

[0051] In one embodiment of the present application, the number of fan blade groups of the supercharged turbine can be configured according to actual needs, such as 7, 8, 9 groups, etc., and this application does not make specific limitations.

[0052] Figure 3 A schematic structural diagram of a high-pressure output spiral tube of a rock breaking device according to an embodiment of the present application is shown.

[0053] refer to Figure 3 In one embodiment of the present application, the supercharging mechanism further includes a high-pressure output spiral tube 11, which is connected to the turbine group. The high-pressure output spiral tube 11 has a rotating thread in the same direction as the supercharged turbine 10.

[0054] Specifically, the high-pressure output spiral tube 11 is internally machined with rotating threads that rotate in the same direction as the supercharged turbine 10. This ensures that the turbine jet's rotational state is not disrupted as it passes through the high-pressure output spiral tube 11, preserving the jet's kinetic energy to the greatest extent possible and enhancing its rock-breaking effectiveness.

[0055] Therefore, the embodiment of the present application, based on the specially designed supercharger turbine 10 and high-pressure output spiral tube 11, achieves an increase in the jet's kinetic energy when compressing the jet, thanks to the supercharger turbine 10. Furthermore, the high-pressure output spiral tube 11, with threads that rotate in the same direction as the supercharger turbine 10, retains kinetic energy, minimizing the loss of jet kinetic energy and thereby enhancing the jet's rock-breaking capability. Furthermore, the supercharging mechanism of the embodiment of the present application comprises only the specially designed supercharger turbine 10 and high-pressure output spiral tube 11, resulting in a simple structural design, ample flow path design space, and ease of modification and upgrade.

[0056] To further illustrate the rock breaking device according to the embodiment of the present application, the working principle of the rock breaking device according to the embodiment of the present application is described below.

[0057] In one embodiment of the present application, the working mode of the combination valve 7 includes a first working mode and a second working mode. When the working mode of the combination valve 7 is the first working mode, the channel connected to the second switching channel B in the combination valve 7 is closed, and the channel connected to the leakage channel E is opened. When the working mode of the combination valve 7 is the second working mode, the channel connected to the second switching channel B in the combination valve 7 is opened, and the channel connected to the leakage channel E is closed.

[0058] Specifically, based on the different working modes of the combination valve 7 and in combination with the throttle valve 13 and the one-way valve 12, the reciprocating motion of the piston can be completed, thereby realizing the compression and output of the fluid and completing the jet-assisted rock breaking.

[0059] Furthermore, the working process of the rock breaking device in the embodiment of the present application is mainly divided into a jet process and a piston reset process. The specific working principle of the rock breaking device in the embodiment of the present application includes:

[0060] Jet process: Assume that the input piston 5 is located at the upper position of the upper chamber of the input piston cylinder (i.e., the top dead center). At this time, the combination valve 7 is controlled to close the communication channel between the lower chamber of the input piston cylinder and the second switching flow channel B and open the communication channel between the lower chamber of the input piston cylinder and the leakage flow channel E. At this time, the second switching flow channel B of the jet element 3 is affected by the back pressure, and the fluid pressure increases, causing the fluid to adhere to the wall on one side of the first switching flow channel C and enter the upper chamber of the input piston cylinder through the first switching flow channel C. As a result, the input piston 5 moves downward under the action of the pressure difference, while driving the blades of the turbocharger 10 of the turbine group to rotate. The fluid in the output piston cylinder 8 is output from the nozzle of the drill bit through the output flow channel F as a high-pressure jet, while the fluid in the lower chamber of the input piston cylinder is discharged through the leakage flow channel E.

[0061] Piston reset process: When the input piston 5 of the input piston cylinder 4 moves to the lower position (i.e., bottom dead center), the combination valve 7 is controlled to reverse, closing the communication channel between the lower chamber of the input piston cylinder and the drain channel E and opening the communication channel between the lower chamber of the input piston cylinder and the second switching channel B. At this time, the pressure in the upper chamber of the input piston cylinder increases due to back pressure, causing the pressure in the first switching channel C connected to the upper chamber of the input piston cylinder to increase. The fluid input from the input channel A is switched to the second switching channel B and flows into the lower chamber of the input piston cylinder through the second switching channel B. The pressure differential between the lower and upper chambers of the input piston cylinder pushes the input piston 5 upward, and the output piston 9 of the output piston cylinder 8 moves upward accordingly. The output piston cylinder 8 also receives working fluid through the one-way valve 12. When the input piston 5 moves to the upper position (i.e., top dead center), the combination valve 7 is controlled to reverse, closing the communication channel between the lower chamber of the input piston cylinder and the second switching channel B and opening the communication channel between the lower chamber of the input piston cylinder and the drain channel E, starting the next high-pressure jet output cycle.

[0062] Specifically, the working process of the rock breaking device in the embodiment of the present application can be divided into a jet process and a piston reset process. During the jet process, the jet output is realized based on the downward movement of the piston through the control of the combination valve 7 to perform rock breaking. After the piston reaches the bottom end of the piston cylinder, the combination valve 7 is controlled again, and the piston enters the piston reset process to perform piston reset. After the piston is reset to the top end of the piston cylinder, based on the control of the combination valve 7, the piston enters the jet process again, and this is repeated, thereby forming a periodic compression and output of the jet, thereby realizing a jet rock breaking method.

[0063] Therefore, in the embodiment of the present application, the fluid is diverted based on the jet element 3, and the fluid is introduced into the piston cylinder through the operation of the throttle valve 13 and the combination valve 7, so that a strong water pressure difference is generated between the input piston cylinder 4 and the output piston cylinder 8 to drive the piston to reciprocate, and then the fluid is periodically compressed through the booster turbine 10 through the piston rod 6 to form a high-pressure jet at the drill bit nozzle, so as to assist the drill bit in breaking rock through the jet, increase the drill bit rock breaking efficiency, avoid drill bit wear, and have a simple structure. During use, under the condition of a certain jet frequency, the output pressure ratio of the jet and the output displacement of the ultra-high pressure jet can be changed by simply adjusting the diameter of the piston.

[0064] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0066] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0067] In addition, all functional units in the embodiments of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the above-mentioned integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0068] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A rock breaking device, It is characterized in that include: The access part is connected to the fluid supply device and the compression part, and includes an upper joint, in which an input flow channel is arranged; The compression part is connected to the upper joint and the output part, and includes an outer cylinder, in which are disposed sequentially a jet element, a motion mechanism with reciprocating motion capability, and a supercharging mechanism, wherein the supercharging mechanism includes a turbine group, and the turbine group includes a turbine compression chamber and a supercharging turbine disposed in the turbine compression chamber; The output part is connected to the outer cylinder and includes a lower joint, in which a leakage flow channel, an output flow channel and a drill bit with a nozzle are arranged; The supercharger turbine comprises a plurality of groups of blades arranged from large to small, two groups of blades connected are alternately rotatable, and the front end of each blade is thicker than the rear end; Wherein, the supercharging mechanism further comprises a high-pressure output spiral tube, the high-pressure output spiral tube is connected to the turbine group, and a rotating thread in the high-pressure output spiral tube rotates in the same direction as the supercharging turbine; The jet element includes a jet channel, which is connected to the input channel and includes a first switching channel and a second switching channel; The motion mechanism includes an inner cylinder, a piston group is arranged at the center of the inner cylinder, and the piston group includes an input piston cylinder, an output piston cylinder, a piston rod, an input piston, an output piston and a combination valve; one end of the piston rod is connected to the input piston, and the other end is connected to the output piston; the input piston is seal-arranged in the input piston cylinder, and the input piston cylinder is divided into an upper chamber of the input piston cylinder and a lower chamber of the input piston cylinder, and the upper chamber of the input piston cylinder is connected to the first switching flow channel; the output piston is arranged in the output piston cylinder, and the output piston cylinder is connected to the boosting mechanism; the combination valve is respectively connected to the lower chamber of the input piston cylinder, the second switching flow channel and the leakage flow channel.

2. The rock breaking device according to claim 1, It is characterized in that The combination valve is a two-position three-way combination valve, the valve core of the combination valve is connected to the input piston, the inlet is connected to the lower chamber of the input piston cylinder, and the channel is respectively connected to the second switching flow channel and the leakage flow channel.

3. The rock breaking device according to claim 1, It is characterized in that The rock breaking device further comprises a throttle valve, which is arranged between the lower chamber of the input piston cylinder and the second switching flow channel.

4. The rock breaking device according to claim 1, It is characterized in that The rock breaking device further comprises a one-way valve, one end of which is connected to the lower chamber of the input piston cylinder, and the other end of which is connected to the fluid supply device.

5. The rock breaking device according to claim 1, It is characterized in that The input piston cylinder, the output piston cylinder and the inner cylinder are sealed and connected via sealing rings.

6. The rock breaking device according to claim 1, It is characterized in that The cross-sectional area of ​​the input piston is larger than that of the output piston.

7. The rock breaking device according to claim 1, It is characterized in that The working mode of the combination valve includes a first working mode and a second working mode; When the working mode of the combination valve is the first working mode, the channel in the combination valve connected to the second switching flow channel is closed, and the channel connected to the leakage flow channel is opened; When the working mode of the combination valve is the second working mode, the channel in the combination valve connected to the second switching flow channel is opened, and the channel connected to the leakage flow channel is closed.

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