A rock drill and a flushing system thereof

Abstract

The invention provides a rock drill and a flushing system thereof, and belongs to the technical field of rock drills. The rock drill flushing system comprises a machine head, a water jacket arranged in the inner hole of the machine head, a stop ring arranged at the rear end of the machine head, and a drill bit passing through the machine head, the stop ring and the water jacket. A sealing structure is arranged between the water jacket and the drill bit. The stop ring and the machine head are separately arranged and are in blocking cooperation in the front-rear direction through a step structure, or the stop ring and the machine head are an integral part. A buffer is arranged in the inner hole of the machine head between the rear end of the water jacket and the front end of the stop ring. The impact force of the drill bit acts on the stop ring and the machine head, and does not directly act on the water jacket. After buffering by the buffer gasket, the water jacket is not subjected to axial impact force, effective protection is formed on the water jacket, the risk of damage to the water jacket itself and the sealing structure caused by multiple impacts is reduced, the problem of easy failure of the water jacket sealing is effectively solved, the flushing system is kept stable and reliable for a long time, the reliability of the rock drill is increased, and the production and maintenance costs of the rock drill are reduced.

Description

Technical Field

[0001] This invention relates to a rock drill and its flushing system, belonging to the field of rock drill technology. Background Technology

[0002] Hydraulic rock drills are key equipment in drill-and-blast tunneling. A hydraulic rock drill includes systems for propulsion, impact, rotation, flushing, lubrication, and buffering. The structure of a common flushing system is as follows: Figure 1 As shown, the system includes a drill shank 10, a drill head 20, a drill shank guide sleeve 30, a shaped sealing ring 40, an O-ring 50, a water jacket 60, and a stop ring 70. The water jacket 60 achieves a good sealing effect through the O-ring 50 and the shaped sealing ring 40. Flushing water is transported forward through the drill shank 10 to remove debris during rock drilling, keep the borehole clean, and cool the drill bit. During rock drilling, the drill shank 10 impacts the stop ring 70, which in turn impacts the water jacket 60. Because the front end of the water jacket 60 is positioned and engaged with the step inside the drill head 20, the water jacket 60 can withstand the impact force from the drill shank 10. However, since the water jacket 60 is made of stainless steel, its strength is relatively weak. Coupled with frequent direct impacts, its seal is prone to failure, leading to damage to the water jacket 60 and related parts, shortening the rock drill's maintenance cycle, and reducing the reliability of the flushing system.

[0003] In response, Chinese utility model patent CN201334868Y discloses a side water injection mechanism for a hydraulic rock drill, including a side water injection housing (i.e., the drill head), a connecting sleeve (i.e., a stop ring), a drill tail, a water distribution sleeve assembly, a connector, and a washer. The water distribution sleeve assembly includes a water distribution sleeve, a water seal, a spring retainer for the hole, and a support sleeve. The drill tail passes through the side water injection housing, the connecting sleeve, and the water distribution sleeve assembly. The water distribution sleeve is fitted onto the drill tail and placed within the side water injection housing. The connecting sleeve is located at the rear end of the side water injection housing, and the connecting sleeve has a stepped surface that engages with the end face of the side water injection housing for a stop. When the rod tip is subjected to a forward impact force, the force is transmitted to the connecting sleeve and the side water injection shell. That is, the side water injection shell also participates in bearing the impact force. However, since the connecting sleeve is in direct contact with the water jacket, the impact force still acts directly on the water jacket and cannot form an effective protection for the water jacket. The water jacket itself and the sealing structure are still easily damaged. Therefore, it is necessary to design a flushing system that can effectively protect the water jacket. Summary of the Invention

[0004] The purpose of this invention is to provide a rock drill flushing system to solve the problem that the water jacket in the existing rock drill flushing system is directly subjected to the impact force transmitted by the retaining ring, which causes the water jacket itself and the sealing structure to be easily damaged; the purpose of this invention is also to provide a rock drill to solve the above problems.

[0005] To achieve the above objectives, the rock drill flushing system of this invention adopts the following technical solution:

[0006] A rock drill flushing system includes a drill head, a water jacket disposed in the inner hole of the drill head, a stop ring disposed at the rear end of the drill head, and a drill tail passing through the drill head, the stop ring, and the water jacket. A sealing structure is provided between the water jacket and the drill tail. The stop ring and the drill head are separately disposed and are mutually stopped in the front-rear direction by a stepped structure, or the stop ring and the drill head are an integral part. A buffer is provided in the inner hole of the drill head between the rear end of the water jacket and the front end of the stop ring.

[0007] The beneficial effects of the above technical solution are as follows: Since the stop ring and the drill head are separately set and the two are stopped and engaged in the front-to-back direction by a stepped structure, or the stop ring and the drill head are an integral part, when the drill shank is subjected to a forward impact force, the force will be transmitted to the stop ring and the drill head; at the same time, since a buffer is set in the inner hole of the drill head between the rear end of the water jacket and the front end of the stop ring, the impact force transmitted to the stop ring will not act directly on the water jacket, but will act on the buffer. After buffering, the water jacket can be protected from axial impact force, effectively protecting the water jacket, reducing the risk of damage to the water jacket itself and the sealing structure caused by multiple impacts, effectively solving the problem of easy failure of the water jacket seal, maintaining the long-term stability and reliability of the flushing system, reducing the risk of flushing system failure, increasing the reliability of the rock drill, improving the working efficiency of the rock drill, and reducing the production and maintenance costs of the rock drill.

[0008] Furthermore, the buffer is a buffer pad fitted onto the outside of the drill bit.

[0009] The advantages of the above technical solution are: the buffer structure is simple, easy to configure and install, and has good performance.

[0010] Furthermore, the outer diameter of the buffer pad is the same as the outer diameter of the water jacket.

[0011] The beneficial effect of the above technical solution is that it maximizes the buffering effect.

[0012] Furthermore, the stop ring and the machine head are separately configured, and the inner hole of the machine head is provided with a stop step for stopping and cooperating with the front end face of the water jacket, so that the water jacket can be installed into the inner hole of the machine head from back to front.

[0013] The advantages of the above technical solution are as follows: the stop ring and the machine head are set separately, which facilitates processing and assembly; the inner hole of the machine head is provided with a stop step for stopping and cooperating with the front end face of the water jacket, so that the water jacket can be installed into the inner hole of the machine head from back to front, which facilitates installation.

[0014] Furthermore, the inner bore of the drill head includes a first inner bore section, a second inner bore section, and a third inner bore section whose inner diameter gradually increases from front to back. The stepped surface between the second inner bore section and the third inner bore section constitutes the aforementioned stop step. The rock drill flushing system also includes a guide copper sleeve disposed in the inner bore of the drill head. The drill bit passes through the guide copper sleeve and the two are guided and engaged. The guide copper sleeve includes a small diameter section and a large diameter section from front to back. The small diameter section is located in the first inner bore section, and the large diameter section is located in the second inner bore section. The stepped surface between the small diameter section and the large diameter section is engaged with the stepped surface between the first inner bore section and the second inner bore section.

[0015] The beneficial effects of the above technical solution are as follows: the inner hole of the machine head is a stepped hole, which facilitates the formation of a stop step and also facilitates the installation of a guide copper sleeve to guide the drill bit. The guide copper sleeve is set in a stepped shape, and the step surface formed by itself is used to stop and cooperate with the step surface in the inner hole of the machine head, which facilitates positioning and assembly.

[0016] Furthermore, the inner bore of the machine head also includes a fourth inner bore section located behind the third inner bore section and having an inner diameter larger than that of the third inner bore section. The stepped surface between the third inner bore section and the fourth inner bore section is in stop-fitting engagement with the front end face of the stop ring. The stepped structure is formed by the stepped surface between the third inner bore section and the fourth inner bore section.

[0017] The beneficial effects of the above technical solution are as follows: the inner hole of the machine head also includes a fourth inner hole section, which facilitates the formation of the stepped structure, and allows the retaining ring to be installed using the inner hole of the machine head, which facilitates assembly and also facilitates the processing and manufacturing of the overall parts.

[0018] Furthermore, the stop ring and the machine head are separate components, and the stepped structure is disposed in the inner hole of the machine head, with the front end face of the stop ring engaging with the stepped structure for a stop.

[0019] The advantages of the above technical solution are: it facilitates processing and assembly.

[0020] Furthermore, the wall thickness of the machine head is more than twice the wall thickness of the water jacket.

[0021] The beneficial effects of the above technical solution are: the water jacket wall thickness is smaller, which reduces the cost of maintaining and replacing the water jacket; the machine head wall thickness is larger, which improves the impact resistance of the machine head.

[0022] Furthermore, the buffer is a helical spring or disc spring sleeved on the outside of the drill bit.

[0023] The advantages of the above technical solution are: the buffer structure is simple and easy to configure, install and use.

[0024] To achieve the above objectives, the rock drill of this invention adopts the following technical solution:

[0025] A rock drill includes a flushing system. The flushing system includes a drill head, a water jacket disposed in the inner hole of the drill head, a stop ring disposed at the rear end of the drill head, and a drill tail passing through the drill head, the stop ring, and the water jacket. A sealing structure is provided between the water jacket and the drill tail. The stop ring and the drill head are separately disposed and are mutually stopped in the front-rear direction by a stepped structure, or the stop ring and the drill head are an integral part. A buffer is provided in the inner hole of the drill head between the rear end of the water jacket and the front end of the stop ring.

[0026] The beneficial effects of the above technical solution are as follows: Since the stop ring and the drill head are separately set and the two are stopped and engaged in the front-to-back direction by a stepped structure, or the stop ring and the drill head are an integral part, when the drill shank is subjected to a forward impact force, the force will be transmitted to the stop ring and the drill head; at the same time, since a buffer is set in the inner hole of the drill head between the rear end of the water jacket and the front end of the stop ring, the impact force transmitted to the stop ring will not act directly on the water jacket, but will act on the buffer. After buffering, the water jacket can be protected from axial impact force, effectively protecting the water jacket, reducing the risk of damage to the water jacket itself and the sealing structure caused by multiple impacts, effectively solving the problem of easy failure of the water jacket seal, maintaining the long-term stability and reliability of the flushing system, reducing the risk of flushing system failure, increasing the reliability of the rock drill, improving the working efficiency of the rock drill, and reducing the production and maintenance costs of the rock drill.

[0027] Furthermore, the buffer is a buffer pad fitted onto the outside of the drill bit.

[0028] The advantages of the above technical solution are: the buffer structure is simple, easy to configure and install, and has good performance.

[0029] Furthermore, the outer diameter of the buffer pad is the same as the outer diameter of the water jacket.

[0030] The beneficial effect of the above technical solution is that it maximizes the buffering effect.

[0031] Furthermore, the stop ring and the machine head are separately configured, and the inner hole of the machine head is provided with a stop step for stopping and cooperating with the front end face of the water jacket, so that the water jacket can be installed into the inner hole of the machine head from back to front.

[0032] The advantages of the above technical solution are as follows: the stop ring and the machine head are set separately, which facilitates processing and assembly; the inner hole of the machine head is provided with a stop step for stopping and cooperating with the front end face of the water jacket, so that the water jacket can be installed into the inner hole of the machine head from back to front, which facilitates installation.

[0033] Furthermore, the inner bore of the machine head includes a first inner bore section, a second inner bore section, and a third inner bore section whose inner diameter gradually increases from front to back. The stepped surface between the second inner bore section and the third inner bore section constitutes the aforementioned stop step. The flushing system also includes a guide copper sleeve disposed in the inner bore of the machine head. The drill bit passes through the guide copper sleeve and the two are guided and engaged. The guide copper sleeve includes a small diameter section and a large diameter section from front to back. The small diameter section is located in the first inner bore section, and the large diameter section is located in the second inner bore section. The stepped surface between the small diameter section and the large diameter section is engaged with the stepped surface between the first inner bore section and the second inner bore section.

[0034] The beneficial effects of the above technical solution are as follows: the inner hole of the machine head is a stepped hole, which facilitates the formation of a stop step and also facilitates the installation of a guide copper sleeve to guide the drill bit. The guide copper sleeve is set in a stepped shape, and the step surface formed by itself is used to stop and cooperate with the step surface in the inner hole of the machine head, which facilitates positioning and assembly.

[0035] Furthermore, the inner bore of the machine head also includes a fourth inner bore section located behind the third inner bore section and having an inner diameter larger than that of the third inner bore section. The stepped surface between the third inner bore section and the fourth inner bore section is in stop-fitting engagement with the front end face of the stop ring. The stepped structure is formed by the stepped surface between the third inner bore section and the fourth inner bore section.

[0036] The beneficial effects of the above technical solution are as follows: the inner hole of the machine head also includes a fourth inner hole section, which facilitates the formation of the stepped structure, and allows the retaining ring to be installed using the inner hole of the machine head, which facilitates assembly and also facilitates the processing and manufacturing of the overall parts.

[0037] Furthermore, the stop ring and the machine head are separate components, and the stepped structure is disposed in the inner hole of the machine head, with the front end face of the stop ring engaging with the stepped structure for a stop.

[0038] The advantages of the above technical solution are: it facilitates processing and assembly.

[0039] Furthermore, the wall thickness of the machine head is more than twice the wall thickness of the water jacket.

[0040] The beneficial effects of the above technical solution are: the water jacket wall thickness is smaller, which reduces the cost of maintaining and replacing the water jacket; the machine head wall thickness is larger, which improves the impact resistance of the machine head.

[0041] Furthermore, the buffer is a helical spring or disc spring sleeved on the outside of the drill bit.

[0042] The advantages of the above technical solution are: the buffer structure is simple and easy to configure, install and use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of a rock drill flushing system in the prior art;

[0044] Figure 2 This is a schematic diagram of the rock drill flushing system in this invention.

[0045] In the diagram: 10, drill bit shank; 20, drill head; 30, drill bit shank guide sleeve; 40, irregular sealing ring; 50, O-ring; 60, water jacket; 70, stop ring; 1, drill bit shank; 2, drill head; 3, guide sleeve; 4, irregular sealing ring; 5, sealing ring; 6, O-ring; 7, water jacket; 8, buffer pad; 9, stop ring. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] An embodiment of the rock drill flushing system of the present invention:

[0051] like Figure 2As shown, the rock drill flushing system includes a shank 1, a drill head 2, a guide sleeve 3, a shaped sealing ring 4, a sealing ring 5, an O-ring 6, a water jacket 7, a buffer gasket 8, and a stop ring 9. The guide sleeve 3, water jacket 7, buffer gasket 8, and stop ring 9 are installed in the inner hole of the drill head 2. The shank 1 passes through the drill head 2, stop ring 9, buffer gasket 8, water jacket 7, and guide sleeve 3. The shank 1 and guide sleeve 3 are guided and fitted together, and sealed by the shaped sealing ring 4. The water jacket 7 and the inner hole of the drill head 2 are sealed by the O-ring 6, which forms a sealing structure between the water jacket 7 and the drill head 2. The water jacket 7 and shank 1 are sealed by the sealing ring 5, which also forms a sealing structure between the water jacket 7 and shank 1.

[0052] The guide copper sleeve 3, water jacket 7, buffer pad 8, and stop ring 9 are sequentially installed into the inner hole of the machine head 2 from back to front. The inner hole of the machine head 2 is a stepped hole, including a first inner hole section, a second inner hole section, a third inner hole section, and a fourth inner hole section whose inner diameter gradually increases from front to back. The guide copper sleeve 3 includes a small diameter section and a large diameter section from front to back. The small diameter section is located in the first inner hole section, and the large diameter section is located in the second inner hole section. The stepped surface between the small diameter section and the large diameter section and the stepped surface between the first inner hole section and the second inner hole section stop and cooperate to achieve positioning of the guide copper sleeve 3 and facilitate assembly.

[0053] The water jacket 7 is located in the third inner bore section. The front end face of the water jacket 7 is in a stop-fitting engagement with the stepped surface between the second and third inner bore sections. That is, the stepped surface between the second and third inner bore sections forms a stop-fitting step, thereby achieving the positioning of the water jacket 7 and facilitating assembly. The stop ring 9 is separately located at the rear end of the machine head 2. The outer diameter of the stop ring 9 is larger than the outer diameter of the water jacket 7, and the front end face of the stop ring 9 is in a stop-fitting engagement with the stepped surface between the third and fourth inner bore sections. Therefore, the stepped surface between the third and fourth inner bore sections forms a stepped structure that stops the stop ring 9 in the front-rear direction. The buffer pad 8 is sleeved on the outside of the drill bit 1, and the buffer pad 8 is located in the third inner bore section between the rear end of the water jacket 7 and the front end of the stop ring 9, forming a buffer between the water jacket 7 and the stop ring 9. The outer diameter of the buffer pad 8 is the same as the outer diameter of the water jacket 7.

[0054] This invention achieves axial positioning of the guide copper sleeve 3, water jacket 7, buffer pad 8, and stop ring 9 through the stepped inner hole of the drill head 2, while keeping the water jacket 7 and stop ring 9 separated. Simultaneously, the thickness of the water jacket 7 is reduced, while the thickness of the drill head 2 shell increases, with the wall thickness of the drill head 2 being more than twice the wall thickness of the water jacket 7. Thus, the impact force of the drill bit during dry drilling acts on the stop ring 9 and the thick drill head 2, while the impact force transmitted to the stop ring 9 does not directly act on the water jacket 7, but rather on the buffer pad 8. This buffering process ensures that the water jacket 7 is not subjected to axial impact force, effectively protecting it and reducing the risk of damage to the water jacket 7 and its sealing structure from repeated impacts. This effectively solves the problem of easy seal failure in the water jacket 7, maintains the long-term stability and reliability of the flushing system, reduces the risk of flushing system failure, increases the reliability of the rock drill, extends the maintenance cycle of the rock drill, improves the working efficiency and utilization efficiency of the rock drill, and reduces the production and maintenance costs of the rock drill. Meanwhile, the water jacket 7 is not subjected to axial impact force, its material thickness is reduced, and maintenance and replacement costs are lower. Furthermore, the buffer pad 8 prevents direct contact between the stop ring 9 and the water jacket 7, effectively reducing the vibration between the water jacket 7 and the guide copper sleeve 3, making the flushing system more stable and significantly improving rock drilling accuracy.

[0055] In other embodiments of the rock drill flushing system: the wall thickness of the drill head can also be less than twice the wall thickness of the water jacket, for example, the wall thickness of the drill head is equal to the wall thickness of the water jacket.

[0056] In other embodiments of the rock drill flushing system: when the stop ring and the drill head are set separately, the stepped structure can also be set on the stop ring. In this case, the rear end face of the drill head and the stepped structure on the stop ring are in a blocking fit in the front-rear direction.

[0057] In other embodiments of the rock drill flushing system: the guide copper sleeve does not use its own stepped surface to stop the engagement with the stepped surface between the first inner hole section and the second inner hole section. The outer diameter of the guide copper sleeve is equal. At this time, the inner hole of the drill head where the guide copper sleeve is installed is of equal diameter, and an elastic retaining ring is installed at the front end of the inner hole of the drill head to prevent the guide copper sleeve from coming out of the inner hole of the drill head.

[0058] In other embodiments of the rock drill flushing system: a guide copper sleeve may not be provided in the inner hole of the drill head. In this case, the water jacket may not be positioned by the stop step in the inner hole of the drill head, but an elastic retaining ring may be installed in the inner hole of the drill head to position the water jacket and prevent it from coming out.

[0059] In other embodiments of the rock drill flushing system: the stop ring and the drill head are integrated, and the water jacket is inserted into the inner hole of the drill head from the front end of the drill head.

[0060] In other embodiments of the rock drill flushing system: the outer diameter of the buffer pad can be smaller than the outer diameter of the water jacket.

[0061] In other embodiments of the rock drill flushing system: the buffer can also be a helical spring or disc spring sleeved on the outside of the drill bit.

[0062] The embodiment of the rock drill in this invention is as follows: the rock drill includes a flushing system, and the specific structure of the flushing system is the same as that of the rock drill flushing system in the above embodiment, and will not be repeated here.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A rock drill flushing system, characterized in that, The machine head (2) includes a guide copper sleeve and a water jacket (7) installed in the inner hole of the machine head (2), a stop ring (9) installed at the rear end of the machine head (2), and a drill bit (1) passing through the machine head (2), the stop ring (9), the water jacket (7), and the guide copper sleeve. A sealing structure is provided between the water jacket (7) and the drill bit (1). The stop ring (9) and the machine head (2) are separate. A buffer is provided in the inner hole of the machine head (2) between the rear end face of the water jacket (7) and the front end face of the stop ring (9). The guide copper sleeve, the water jacket, the buffer, and the stop ring are installed into the machine head from back to front in sequence. The inner bore of the machine head includes a first inner bore section, a second inner bore section, a third inner bore section, and a fourth inner bore section whose inner diameter gradually increases from front to back. The small-diameter section of the guide copper sleeve is located in the first inner bore section, and the large-diameter section is located in the second inner bore section. The step surface between the small-diameter section and the large-diameter section is in stop-fit ​​with the step surface between the first inner bore section and the second inner bore section. The water jacket and buffer are located in the third inner bore section. The front end face of the water jacket is in stop-fit ​​with the step surface between the second inner bore section and the third inner bore section. The front end face of the stop ring is in stop-fit ​​with the step surface between the third inner bore section and the fourth inner bore section.

2. The rock drill flushing system according to claim 1, characterized in that, The buffer is a buffer pad (8) that is sleeved on the outside of the drill bit (1).

3. The rock drill flushing system according to claim 2, characterized in that, The outer diameter of the buffer pad (8) is the same as the outer diameter of the water jacket (7).

4. The rock drill flushing system according to any one of claims 1 to 3, characterized in that, The shank and guide sleeve are aligned and engaged, while also being sealed by a shaped sealing ring.

5. The rock drill flushing system according to any one of claims 1 to 3, characterized in that, The water jacket and the inner hole of the machine head are sealed together by an O-ring.

6. The rock drill flushing system according to claim 1, characterized in that, The buffer is a helical spring fitted around the outside of the drill bit.

7. The rock drill flushing system according to any one of claims 1 to 3, characterized in that, The thickness of the machine head wall is equal to the thickness of the water jacket wall.

8. The rock drill flushing system according to any one of claims 1 to 3, characterized in that, The wall thickness of the machine head (2) is more than twice the wall thickness of the water jacket (7).

9. The rock drill flushing system according to claim 1, characterized in that, The buffer is a disc spring sleeved on the outside of the rod tail (1).

10. A rock drill, comprising a flushing system, characterized in that, The flushing system includes a machine head (2), a guide copper sleeve and a water jacket (7) installed in the inner hole of the machine head (2), a stop ring (9) installed at the rear end of the machine head (2), and a drill bit (1) passing through the machine head (2), the stop ring (9), the water jacket (7), and the guide copper sleeve. A sealing structure is provided between the water jacket (7) and the drill bit (1). The stop ring (9) and the machine head (2) are separate. A buffer is provided in the inner hole of the machine head (2) between the rear end face of the water jacket (7) and the front end face of the stop ring (9). The guide copper sleeve, the water jacket, the buffer, and the stop ring are installed sequentially from back to front. The inner bore of the machine head includes a first inner bore section, a second inner bore section, a third inner bore section, and a fourth inner bore section whose inner diameter gradually increases from front to back. The small-diameter section of the guide copper sleeve is located in the first inner bore section, and the large-diameter section is located in the second inner bore section. The step surface between the small-diameter section and the large-diameter section is in stop-fit ​​with the step surface between the first inner bore section and the second inner bore section. The water jacket and buffer are located in the third inner bore section. The front end face of the water jacket is in stop-fit ​​with the step surface between the second inner bore section and the third inner bore section. The front end face of the stop ring is in stop-fit ​​with the step surface between the third inner bore section and the fourth inner bore section.

11. The rock drill according to claim 10, characterized in that, The buffer is a buffer pad (8) that is sleeved on the outside of the drill bit (1).

12. The rock drill according to claim 11, characterized in that, The outer diameter of the buffer pad (8) is the same as the outer diameter of the water jacket (7).

13. The rock drill according to any one of claims 10 to 12, characterized in that, The shank and guide sleeve are aligned and engaged, while also being sealed by a shaped sealing ring.

14. The rock drill according to any one of claims 10 to 12, characterized in that, The water jacket and the inner hole of the machine head are sealed together by an O-ring.

15. The rock drill according to claim 10, characterized in that, The buffer is a helical spring fitted around the outside of the drill bit.

16. The rock drill according to any one of claims 10 to 12, characterized in that, The thickness of the machine head wall is equal to the thickness of the water jacket wall.

17. The rock drill according to any one of claims 10 to 12, characterized in that, The wall thickness of the machine head (2) is more than twice the wall thickness of the water jacket (7).

18. The rock drill according to claim 10, characterized in that, The buffer is a disc spring sleeved on the outside of the rod tail (1).

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