CN219622627U

CN219622627U - Buffering system of hydraulic rock drill without one-way valve

Info

Publication number: CN219622627U
Application number: CN202320241247.7U
Authority: CN
Inventors: 丁河江; 郭建飞; 马建乐; 姜鑫; 周忠尚; 刘赛; 王英赫
Original assignee: Xuzhou XCMG Foundation Construction Machinery Co Ltd
Current assignee: Xuzhou XCMG Foundation Construction Machinery Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-09-01
Anticipated expiration: 2033-02-17

Abstract

The utility model discloses a hydraulic rock drill buffer system without a one-way valve, wherein an oil return assembly is not provided with the one-way valve, the oil return assembly comprises an oil return oil duct, the upper part of the oil return oil duct is communicated with a buffer oil inlet duct, and the lower part of the oil return oil duct is communicated with an impact oil return duct; the upper half part of the oil return duct is assembled in the gear box body, and the lower half part is assembled in the impact box body; the joint of the upper half and the lower half is provided with a damping pin body which is of a hollow structure, and the aperture of the upper half is larger than that of the lower half. The problem of overlarge oil return amount is prevented by adopting the structure form of the damping pin body instead of the one-way valve, so that the problem that the drill shank is influenced by overlarge oil return amount due to the blocking of the one-way valve in the use process is avoided, the service life of the drill shank is effectively prolonged, and the working efficiency is improved; the damping pin body also plays a role of a positioning pin, has the function of connecting and positioning the end faces of the two boxes, effectively simplifies the structure of the whole machine and reduces the cost of the whole machine.

Description

Buffering system of hydraulic rock drill without one-way valve

Technical Field

The utility model relates to the field of hydraulic rock drills, in particular to a buffer system of a hydraulic rock drill without a one-way valve.

Background

The hydraulic rock drill is a key device for tunneling by a drilling and blasting method, and a buffer system is needed to absorb the rebound kinetic energy in the drilling process of the hydraulic rock drill, so that the service life of the rock drill is prolonged, and the working efficiency of the rock drill is improved. The impact piston makes high-frequency reciprocating motion during working, and continuously impacts the drill shank, and the buffer system is required to continuously absorb rebound kinetic energy generated by collision between the piston and the drill shank in the process.

The buffer system is used as an important component of the hydraulic rock drill, wherein the drill shank thrust sleeve is propped against the end face of the drill shank spline, so that rebound kinetic energy is absorbed. In the oil return process of the buffer system, the inner pore canal of the damping pin plays a role of a one-way valve, and meanwhile, the damping pin is cylindrical in shape and plays a role of a positioning pin. The commonly used check valve comprises a valve core, a valve body, a spring and other parts, the structure is complex, the check valve is easy to be blocked in the use process, and the oil return quantity is too large, so that a gap is reserved between the drill bit end thrust sleeve and the end face of the drill bit end spline, the condition that the drill bit end strikes the drill bit end thrust sleeve through the rebound force can be caused, the service life of the drill bit end can be greatly shortened, and meanwhile, the working efficiency is reduced.

Disclosure of Invention

The utility model aims to: in order to solve the problems in the prior art, the utility model provides the hydraulic rock drill buffer system without the check valve, which effectively prolongs the service life of the drill shank and improves the working efficiency.

The technical scheme is as follows: in order to achieve the above purpose, the present utility model adopts the following technical scheme: the hydraulic rock drill buffering system without the check valve comprises an oil inlet assembly and an oil return assembly, wherein the oil return assembly is not provided with the check valve, and the oil inlet assembly comprises a buffering oil inlet passage, a buffering cavity, a buffering piston, an impact piston, a drill shank and a drill shank thrust sleeve;

the buffer oil inlet channel is communicated with a buffer cavity, and the buffer cavity is arranged at the outer side of the buffer piston; the buffer piston is sleeved outside the drill shank thrust sleeve; the drill bit tail thrust sleeve is abutted against the end face of the drill bit tail spline; an impact piston is arranged below the end face of the drill shank spline;

the oil return assembly comprises an oil return oil duct, wherein the upper part of the oil return oil duct is communicated with the buffer oil inlet duct, and the lower part of the oil return oil duct is communicated with the impact oil return oil duct; the upper half part of the oil return duct is assembled in the gear box body, and the lower half part of the oil return duct is assembled in the impact box body; the joint of the upper half and the lower half is provided with a damping pin body which is of a hollow structure, and the aperture of the upper half is larger than that of the lower half.

Further, the oil inlet assembly further comprises a buffer piston sleeve, and the buffer piston is arranged in the buffer piston sleeve.

Furthermore, a driving sleeve for providing circumferential acting force is arranged on the circumferential outer side of the drill shank.

In order to prevent leakage generated at the joint of the end surfaces of the two box bodies of the oil return duct, the damping pin body and the inner wall of the oil return duct are provided with sealing parts at the joint of the two end surfaces.

Further, the sealing component is a sealing ring.

In order to simultaneously have the connection positioning function of the two box end faces, the damping pin body is a positioning pin at the same time, so that the design of redundant parts is reduced, the whole structure is simplified, and the whole cost is reduced.

Furthermore, the damping pin body is of a hollow cylinder structure with thick upper part and thin lower part.

The beneficial effects are that: the utility model has the following advantages:

the hydraulic rock drill buffer system does not use a one-way valve, but adopts a damping pin structure form to prevent the problem of overlarge oil return amount, so that the problem of influence on the drill shank caused by the blocking of the one-way valve in the use process due to the overlarge oil return amount is avoided, the service life of the drill shank is effectively prolonged, and the working efficiency is improved; the damping pin body also plays a role of a positioning pin, has the function of connecting and positioning the end faces of the two boxes, effectively simplifies the structure of the whole machine and reduces the cost of the whole machine.

Drawings

FIG. 1 is a schematic cross-sectional view of an oil intake assembly and an oil return assembly of a hydraulic rock drill buffering system without a check valve of the present utility model;

FIG. 2 is a schematic cross-sectional view of an oil return assembly of the present utility model;

fig. 3 is a schematic view of the oil passage line structure of the present utility model.

Detailed Description

Referring to fig. 1-3, the utility model discloses a hydraulic rock drill buffer system without a check valve, which comprises an oil inlet component and an oil return component, wherein the oil return component is not provided with a check valve design, and the oil inlet component comprises a buffer oil inlet channel 11, a buffer cavity 12, a buffer piston 13, an impact piston 14, a drill shank 15, a drill shank thrust sleeve 16, a driving sleeve 17 and a buffer piston sleeve 18;

the buffer oil inlet channel 11 is communicated with the buffer cavity 12, and the buffer cavity 12 is arranged at the outer side of the buffer piston 13; the buffer piston 13 is sleeved outside the drill shank thrust sleeve 16; the buffer piston 13 is simultaneously arranged in the buffer piston sleeve 18. The drill shank thrust sleeve 16 is abutted against the spline end face of the drill shank 15; an impact piston 14 is arranged below the spline end face of the drill shank 15; the circumferential outer side of the drill shank 15 is also provided with a driving sleeve 17 for providing circumferential acting force.

The oil return assembly comprises an oil return oil duct 21, wherein the upper part of the oil return oil duct 21 is communicated with the buffer oil inlet duct 11, and the lower part of the oil return oil duct is communicated with the impact oil return duct; the upper half part of the oil return duct 21 is assembled in the gear box body 3, and the lower half part is assembled in the impact box body 4; the joint of the upper half and the lower half is provided with a damping pin body 22, the damping pin body 22 is of a hollow cylinder structure with a thick upper part and a thin lower part, and the aperture of the upper half is larger than that of the lower half. In order to simultaneously have the connecting and positioning functions of the two box end faces, the damping pin body 22 is a positioning pin at the same time, so that the design of redundant parts is reduced, the whole structure is simplified, and the cost of the whole machine is reduced. In order to prevent leakage generated at the joint of the end surfaces of the two boxes of the oil return duct, sealing rings 23 of sealing parts are arranged at the joint of the two end surfaces of the damping pin body 22 and the inner wall of the oil return duct 21.

The working process comprises the following steps:

in the oil inlet assembly, oil enters from the buffer oil inlet passage 11 and then enters the buffer cavity 12, and the buffer piston 13 is pressed against the drill shank thrust sleeve 16 under the pressure of the oil inlet in the cavity, so that the drill shank thrust sleeve 16 is propped against the spline end face of the drill shank 15. In the rock drilling process, the acting force from the continuous striking of the impact piston 14 is arranged below the drill shank 1, and the drill shank thrust sleeve 2 can be always propped against the spline end face of the drill shank 1 under the pressure of the buffer oil inlet 5, so that the resilience force of the drill shank 1 is absorbed. In the oil return process of the buffer system, the inner pore canal of the damping pin body 22 in the oil return oil duct 11 of the oil return assembly plays a role of a one-way valve, and meanwhile, the outer shape of the damping pin body is a cylinder and plays a role of a positioning pin; meanwhile, the inner hole of the damping pin body is designed into a structure with a large front part and a small rear part, and oil return back pressure can be formed, so that the drill shank thrust sleeve 16 is always propped against the spline end face of the drill shank 15. And gaps are avoided between the drill shank thrust sleeve 16 and the spline end face of the drill shank 15.

The hydraulic rock drill buffer system does not use a one-way valve, but adopts the structure form of the damping pin body to prevent the problem of overlarge oil return amount, so that the problem of influence on the drill shank caused by the blocking of the one-way valve in the use process due to overlarge oil return amount is avoided, the service life of the drill shank is effectively prolonged, and the working efficiency is improved; the damping pin body also plays a role of a positioning pin, has the function of connecting and positioning the end faces of the two boxes, effectively simplifies the structure of the whole machine and reduces the cost of the whole machine.

Claims

1. The hydraulic rock drill buffering system without the check valve comprises an oil inlet assembly and an oil return assembly, and is characterized in that the oil return assembly is not provided with the check valve, and the oil inlet assembly comprises a buffering oil inlet passage (11), a buffering cavity (12), a buffering piston (13), an impact piston (14), a drill shank (15) and a drill shank thrust sleeve (16);

the buffer oil inlet channel (11) is communicated with the buffer cavity (12), and the buffer cavity (12) is arranged at the outer side of the buffer piston (13); the buffer piston (13) is sleeved outside the drill shank thrust sleeve (16); the drill shank thrust sleeve (16) is abutted against the end face of the spline of the drill shank (15); an impact piston (14) is arranged below the spline end face of the drill shank (15);

the oil return assembly comprises an oil return oil duct (21), wherein the upper part of the oil return oil duct (21) is communicated with the buffer oil inlet duct (11), and the lower part of the oil return oil duct is communicated with the impact oil return oil duct; the upper half part of the oil return duct (21) is assembled in the gear box body (3), and the lower half part is assembled in the impact box body (4); the joint of the upper half and the lower half is provided with a damping pin body (22), the damping pin body (22) is of a hollow structure, and the aperture of the upper half is larger than that of the lower half.

2. The valveless hydraulic rock drill buffering system of claim 1, wherein: the oil inlet assembly further comprises a buffer piston sleeve (18), and the buffer piston (13) is arranged in the buffer piston sleeve (18).

3. The valveless hydraulic rock drill buffering system of claim 1, wherein: the circumferential outer side of the drill shank (15) is also provided with a driving sleeve (17) for providing circumferential acting force.

4. The valveless hydraulic rock drill buffering system of claim 1, wherein: the damping pin body (22) and the inner wall of the oil return duct (21) are provided with sealing parts at the joint of the two end surfaces.

5. The valveless hydraulic rock drill buffering system of claim 4, wherein: the sealing component is a sealing ring (23).

6. The valveless hydraulic rock drill buffering system of claim 1, wherein: the damping pin body (22) is also a locating pin.

7. The valveless hydraulic rock drill buffering system of claim 6, wherein: the damping pin body (22) is of a hollow cylinder structure with thick upper part and thin lower part.