CN-224229005-U - Hydraulic rock drill provided with hydraulic stop piston

Abstract

The utility model relates to the technical field of rock drills, in particular to a hydraulic rock drill with a hydraulic stop piston, which comprises a rock drill body, a sleeve assembly, an impact piston, a hydraulic stop piston and a drill shank, wherein the sleeve assembly is arranged in the rock drill body, the hydraulic stop piston is arranged in the sleeve assembly, the impact piston penetrates through the hydraulic stop piston, the drill shank is arranged in the rock drill body and is positioned at the front end of the hydraulic stop piston, a first control chamber, a second control chamber and a third control chamber for buffering are formed between the hydraulic stop piston and the sleeve assembly, and a lubrication chamber is formed between the impact piston and the drill shank. The utility model solves the technical problem that the rebound energy generated after the drill tool impacts the rock can not be absorbed completely, so that the internal parts of the rock drill are damaged.

Inventors

• XU AIFENG
• YI DAYUN
• GAN SHIYU
• XIAO ZHENGHANG
• TIAN JIAN
• ZHOU SHENG
• AN JINKAI

Assignees

• 中国铁建重工集团股份有限公司

Dates

Publication Date

20260512

Application Date

20250526

Claims (7)

1. 1. The hydraulic rock drill with the hydraulic stop piston is characterized by comprising a rock drill body (1), a sleeve assembly, an impact piston (5), a hydraulic stop piston (13) and a drill shank (15), wherein the sleeve assembly is installed inside the rock drill body (1), the hydraulic stop piston (13) is installed in the sleeve assembly, the impact piston (5) penetrates through the hydraulic stop piston (13), the drill shank (15) is installed in the rock drill body (1) and is located at the front end position of the hydraulic stop piston (13), a first control chamber (30), a second control chamber (22) and a third control chamber (24) for buffering are formed between the hydraulic stop piston (13) and the sleeve assembly, and a lubrication chamber (14) is formed between the impact piston (5) and the drill shank (15).
2. 2. The hydraulic rock drill provided with the hydraulic stop piston according to claim 1, characterized in that the sleeve assembly comprises a first inner sleeve (2), a second inner sleeve (3) and a third inner sleeve (4) which are sequentially butted from the drill shank (15) to the inside of the rock drill body (1), the first control chamber (30) is formed by surrounding between the hydraulic stop piston (13) and the first inner sleeve (2), the second control chamber (22) is formed by surrounding between the hydraulic stop piston (13) and the first inner sleeve (2) and the second inner sleeve (3), and the third control chamber (24) is formed by surrounding between the rear end face of the hydraulic stop piston (13) and the second inner sleeve (3).
3. 3. Hydraulic rock drill provided with a hydraulic stop piston according to claim 2, characterized in that a first connecting channel (16) is provided in the hydraulic stop piston (13), which first connecting channel (16) communicates with the first control chamber (30) and the second control chamber (22) when the shank (15) is in an impact state, which second control chamber (22) is intended to be connected to a first high-pressure oil source (9).
4. 4. Hydraulic rock drill provided with a hydraulic stop piston according to claim 2, characterized in that a signal channel (37) and a control channel are provided in the hydraulic stop piston (13) which are in communication, the control channel being in communication with the third control chamber (24), the first inner sleeve (2) being provided with an annular groove (34) inside, the annular groove (34) being intended for connection to a low pressure oil source (11), the signal channel (37) being in communication with the annular groove (34) when the hydraulic stop piston (13) is in a neutral position.
5. 5. Hydraulic rock drill provided with a hydraulic stop piston according to claim 2, characterized in that a fourth control chamber (6) is formed between the second inner sleeve (3), the third inner sleeve (4) and the percussion piston (5), which fourth control chamber (6) is connected to a first high-pressure oil source (9), and that the percussion piston (5) is provided with a control end surface (19) in contact with the third inner sleeve (4).
6. 6. Hydraulic rock drill provided with a hydraulic stop piston according to claim 2, characterized in that a fifth control chamber (7) is formed between the third inner sleeve (4) and the impact piston (5), the third inner sleeve (4) being provided with a reversing valve (8), the reversing valve (8) being intended to be connected to a first high pressure oil source (9) and a low pressure oil source (11), the reversing valve (8) being connected to the fifth control chamber (7).
7. 7. Hydraulic rock drill provided with a hydraulic stop piston according to claim 1, characterized in that the front end of the hydraulic stop piston (13) is provided with a backstop bushing (20).

Description

Hydraulic rock drill provided with hydraulic stop piston Technical Field The utility model relates to the technical field of rock drills, in particular to a hydraulic rock drill with a hydraulic stop piston. Background The rock drill is characterized in that the piston rod impacts the drill shank, the kinetic energy of the piston rod is converted into stress wave energy, and the stress wave energy is transmitted into the rock, so that rock breaking is realized. However, as the drill tool and the rock have elastic characteristics, the drill tool inevitably generates severe rebound after impacting the rock, and the kinetic energy carried by the drill tool is directly transmitted to the internal parts of the rock drill if the kinetic energy is not effectively absorbed. This not only causes severe vibrations and noise, but also causes damage to the internal parts, which in turn affects the life and reliability of the rock drill. In addition, vibrations and bouncing of the drill bit under repeated impacts of the rock will result in a relative displacement of the tool supporting the drill rod on the rock, and an unstable bearing force of the drill bit on the rock will affect the positioning of the drill shank relative to the impact piston and thus the performance of the liquid drilling rock drill. Chinese patent CN115075723a discloses a hydraulic rotary impact hammer provided with a stop piston comprising a body, a shank, an impact piston for striking the shank, and a stop piston for positioning the shank in a predetermined equilibrium position. The body and the stopper piston define a first control chamber permanently connected to the high pressure fluid supply line and configured for urging the stopper piston forward, and a second control chamber configured for urging the stopper piston forward. The hydraulic rotary impact hammer drill includes a fluid communication passage open to the second control chamber, configured for supplying the second control chamber with a high pressure fluid, and provided with a calibrated orifice. However, this patent has the problem that its stop piston requires forward limiting of the body and that the stop piston is kept spaced from the block on condition that the impact piston stop plane is located at the edge of the brake chamber when the piston hits the shank. The first control chamber is in communication with the return line, in which case the damping force acting on the stopper piston is lost. The first control chamber and the second control chamber can be communicated and share one path of high-pressure oil, meanwhile, the second control chamber can be permanently connected with the main control chamber of the impact piston, a closed chamber is not formed, partial energy is lost along with leakage of fluid, and the partial energy cannot be effectively converted into impact energy, so that the energy utilization rate of the whole system is reduced. The pressure loss due to the unsealing of the chamber may subject the rock drill internals to excessive loads, thereby increasing the risk of damage to the rock drill. For example, the impact piston and the stopper piston may be damaged by lack of sufficient damping force. In view of the foregoing, there is a need for a buffer device that can absorb and utilize the rebound energy of the shank adapter to solve the problems of the prior art. Disclosure of utility model The utility model aims to provide a hydraulic rock drill with a hydraulic stop piston, which solves the technical problem that rebound energy generated after a drill tool impacts rock cannot be completely absorbed to cause damage to internal parts of the rock drill in the prior art, and the technical scheme is as follows: The utility model provides a hydraulic rock drill with a hydraulic stop piston, which comprises a rock drill body, a sleeve assembly, an impact piston, a hydraulic stop piston and a drill shank, wherein the sleeve assembly is arranged in the rock drill body, the hydraulic stop piston is arranged in the sleeve assembly, the impact piston penetrates through the hydraulic stop piston, the drill shank is arranged in the rock drill body and is positioned at the front end of the hydraulic stop piston, a first control chamber, a second control chamber and a third control chamber for buffering are formed between the hydraulic stop piston and the sleeve assembly, and a lubrication chamber is formed between the impact piston and the drill shank. The utility model provides a further improvement of a hydraulic rock drill provided with a hydraulic stop piston, which is characterized in that the sleeve assembly comprises a first inner sleeve, a second inner sleeve and a third inner sleeve which are sequentially butted from the drill shank to the inside of a rock drill body, wherein a first control chamber is formed by surrounding between the hydraulic stop piston and the first inner sleeve, a second control chamber is formed by surrounding between the hydraulic s