WO2023273225A1

WO2023273225A1 - Signal oil output structure of impact cylinder of hydraulic rock drill

Info

Publication number: WO2023273225A1
Application number: PCT/CN2021/140409
Authority: WO
Inventors: 何清华; 丁河江; 宋磊
Original assignee: 山河智能装备股份有限公司
Priority date: 2021-06-29
Filing date: 2021-12-22
Publication date: 2023-01-05
Also published as: CN113236112A

Abstract

A signal oil output structure of an impact cylinder of a hydraulic rock drill. The impact cylinder (4) is merely provided with one signal oil port (41) communicated with a control cavity (S) of a reversing valve (5); during a return stroke of an impact piston (3), the impact piston (3) completes return stroke control travel (Sc) before the left side of the signal oil port (41), and the signal oil port (41) is communicated with a piston front cavity (7); during a forward stroke of the impact piston (3), the impact piston (3) starts from the right side of the signal oil port (41) and completes forward stroke control travel (Sic), and the signal oil port (41) is communicated with a piston middle cavity (8).

Description

A signal oil output structure of the impact cylinder of a hydraulic rock drill

technical field

The invention relates to a hydraulic rock drill, in particular to a signal oil output structure of an impact cylinder of a hydraulic rock drill.

Background technique

At present, the reversing action of the reversing valve of the hydraulic rock drill is controlled by the movement position feedback of the impact piston, that is, the reversing valve is driven by the feedback signal oil of the movement position of the impact piston, and then the return stroke and stroke of the impact piston are controlled by the reversing valve. As shown in Fig. 1 and Fig. 2, at present, the movement position feedback of the impact piston 3 is provided by respectively setting the return reversing signal oil port 1 and the stroke reversing signal oil port 2 on the cylinder body 4 of the impact piston 3, and switching the return stroke The direction signal oil port 1 and the stroke reversing signal oil port 2 communicate with the control cavity S of the reversing valve 5 . In this way, when the impact piston 3 controls the stroke Sc through the return stroke, the return reversing signal oil port 1 will be opened, the piston front chamber 7 of the impact piston 3 communicates with the return reversing signal oil port 1, and the return reversing signal oil port 1 flows out of high pressure The signal oil enters the control chamber S of the reversing valve 5, and pushes the spool of the reversing valve 5 to move to make the piston rear chamber 9 of the impact piston 3 input high-pressure oil, even if the return braking of the impact piston 3 is switched to a stroke; when the impact When the piston 3 controls the stroke Sic through the stroke, the stroke reversing signal oil port 2 will be opened, the piston cavity 8 of the impact piston 3 is connected with the stroke reversing signal oil port 2, and the stroke reversing signal oil port 2 flows out of the low-pressure signal oil and enters The control chamber S of the reversing valve 5 pushes the spool of the reversing valve 5 to move so that the piston rear chamber 9 of the impact piston 3 stops inputting high-pressure oil, and the oil in the piston rear chamber 9 returns to the oil tank, so that the stroke of the impact piston 3 Brake and switch to backhaul.

Due to the different performance parameter requirements of different hydraulic rock drills, the size of the return control stroke Sc and the stroke control stroke Sic is often changed. A plurality of return stroke reversing signal oil port 1 and stroke reversing signal oil port 2 are arranged on the top. This makes the design and processing of the impact cylinder block have the following difficulties:

1) The structure of the impact cylinder 4 becomes more complicated. In many cases, due to the interference of each signal oil port or the limitation of the structure, the design scheme cannot be realized, which increases the complexity and difficulty of the design;

2) Multiple signal oil ports increase the processing difficulty of the impact cylinder, because adding one signal oil port will increase many grooves and holes, which will double the processing difficulty and increase the occurrence of burrs and flashes at the staggered holes Risk, these burrs and flashes are very difficult to deal with during processing, and will bring many failures to the use of hydraulic rock drills in the future;

3) Due to the increase in the number of signal oil ports, there are many tees, crosses or blind spots at the signal oil port, resulting in a complicated hydraulic flow process, increased damping and compressible volume, and increased product design complexity. It is more difficult to eliminate when a fault occurs during use.

Contents of the invention

The technical problem to be solved by the present invention is to provide a signal oil output structure of the impact cylinder of the hydraulic rock drill that can simplify the structure of the impact cylinder in view of the design and processing difficulties caused by the multi-signal oil ports of the impact cylinder of the existing hydraulic rock drill.

In order to solve the above technical problems, the present invention provides a signal oil output structure of the impact cylinder of a hydraulic rock drill, which includes an impact cylinder, an impact piston and a reversing valve, the impact piston is installed in the impact cylinder, and the impact The piston is provided with a first annular boss and a second annular boss in cooperation with the impact cylinder, so that the impact piston and the impact cylinder form a piston front cavity, a piston middle cavity and a piston rear cavity, There is only one signal oil port connected to the control chamber of the reversing valve on the impact cylinder, and when the impact piston returns, the impact piston completes the return control stroke before the left side of the signal oil port After Sc, the signal oil port communicates with the front chamber of the piston; when the impact piston strokes, the impact piston starts from the right side of the signal oil port and completes the stroke control stroke Sic, the signal oil The port communicates with the cavity of the piston.

In the present invention, only one signal oil port connected to the control chamber of the reversing valve is provided on the impact cylinder, and when the impact piston returns, the impact piston completes the return stroke before the left side of the signal oil port After the control stroke Sc, the signal oil port communicates with the front chamber of the piston; when the impact piston strokes, the impact piston starts from the right side of the signal oil port and completes the stroke control stroke Sic, the The signal oil port is connected with the piston cavity to control the return stroke, which not only ensures the return control stroke Sc and the stroke control stroke Sic required by the design of the hydraulic rock drill, but also when the impact piston passes the return control stroke Sc during the return stroke, the signal The oil port can be gradually opened and the high-pressure oil in the front chamber of the piston is output to the control chamber of the reversing valve, so that the spool of the reversing valve moves, and then the piston rear chamber of the impacting piston realizes oil intake and maintains a high pressure state, making the impact The return stroke of the piston brakes and reverses the stroke, and the signal oil port is gradually closed; when the impact piston 3 passes the stroke control stroke Sic during the stroke, the signal oil port is gradually opened again and the hydraulic oil in the piston cavity is connected to the reversing valve The control chamber of the reversing valve is connected to the control chamber of the reversing valve with low-pressure oil, and the spool of the reversing valve moves in the reverse direction, thereby depressurizing the piston rear chamber of the impacting piston, braking the stroke of the impacting piston and commutating to start the return stroke. Repeat this until the movement of the impact piston is interrupted.

In order to adapt to the performance parameters (return control stroke Sc and stroke control stroke Sic) requirements of different hydraulic rock drills, one of the following schemes can be further adopted:

1) The signal oil port includes a first groove provided on the impact cylinder, and the signal oil port communicates with the first groove;

2) A second groove communicating with the piston front cavity is provided on the left side of the first annular boss;

3) A third groove communicating with the piston cavity is provided on the right side of the first annular boss.

When a bush is arranged between the impact piston and the impact cylinder, the piston front chamber, piston middle chamber and piston rear chamber are arranged between the bush and the impact piston, and the first A groove is provided on the bush.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention reduces the processing difficulty of the cylinder block of the hydraulic rock drill by setting only one signal oil port, and improves the processing yield of the cylinder block.

2. Due to the reduction of the signal oil port, the present invention avoids the malfunction of the product caused by the cylinder body burr caused by the multi-signal oil port processing.

3. The setting of a signal oil port in the present invention prolongs the life of the cylinder body and the service interval, and improves the product quality.

4. The solution of the present invention is not limited by the structural size of the cylinder body, and the overall performance of the hydraulic rock drill can be easily changed, which is beneficial to the modularization and platformization of the hydraulic rock drill.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of a reversing valve of a traditional hydraulic rock drill.

Fig. 2 is a schematic diagram of the multi-signal oil port structure of the reversing valve of the traditional hydraulic rock drill.

Fig. 3 is a structural schematic diagram of Embodiment 1 of the signal oil output structure of the percussion cylinder of the hydraulic rock drill of the present invention.

Fig. 4 is a structural schematic diagram of the reversing valve of the hydraulic rock drill of the present invention when the spool is in the left position.

Fig. 5 is a structural schematic view of the hydraulic rock drill reversing valve of the present invention when the spool is in the right position.

Fig. 6 is a flow distribution control principle diagram of the reversing valve of the hydraulic rock drill of the present invention.

Fig. 7 is a structural schematic diagram of Embodiment 2 of the signal oil output structure of the percussion cylinder of the hydraulic rock drill of the present invention.

Fig. 8 is a structural schematic diagram of Embodiment 3 of the signal oil output structure of the percussion cylinder of the hydraulic rock drill of the present invention.

In the figure: 1. Return reversing signal port; 2. Stroke reversing signal port; 3. Impact piston; 4. Impact cylinder; 5. Reversing valve; 6. Feedback oil circuit; 7. Piston front cavity; 8. Piston middle cavity; 9. Piston rear cavity; 31. First annular boss; 32. Second annular boss; 41. Signal oil port; 42. First groove; 51. Valve sleeve; 52. Valve core 53, valve body; 311, second groove; 312, third groove; 511, oil inlet; 512, oil outlet; 513, oil return port; 521, septum; A, outlet port; B, Separator; C, balance chamber; D, first oil return chamber; E, spool; F, valve body; G, first oil return chamber; P, high pressure oil supply chamber; T, oil return chamber; S, control Cavity; Sc, return stroke control stroke; Sic, stroke control stroke.

detailed description

The present invention will be further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

For the convenience of description, the relative positional relationship of each component, such as: the description of up, down, left, right, etc., is described according to the layout direction of the drawings in the specification, and does not limit the structure of this patent.

As shown in FIG. 3 , the first embodiment of the signal oil output structure of the impact cylinder of the hydraulic rock drill of the present invention includes an impact cylinder and a reversing valve 5 , and the impact cylinder includes an impact cylinder 4 and an impact piston 3 .

One end of the impact piston 3 is installed in the impact cylinder 4, and the impact piston 3 is provided with a first annular boss 31 and a second annular boss 32 that are matched with the inner cavity of the impact cylinder 4 , so that the piston front chamber 7, the piston middle chamber 8 and the piston rear chamber 9 are formed between the impact piston 3 and the impact cylinder 4, and the hydraulic effective area of the piston rear chamber on the impact piston 3 is larger than the hydraulic pressure of the piston front chamber effective area.

Only one signal oil port 41 is provided on the impact cylinder 4, and the signal oil port 41 communicates with the control chamber S of the reversing valve 5 through a pipeline. When the impact piston 3 returns, after the impact piston 3 completes the return stroke Sc before the left side of the signal oil port 41, the signal oil port 41 communicates with the piston front chamber 7; the impact piston 3 During the stroke, the impact piston 3 starts from the right side of the signal oil port 41 and completes the stroke control stroke Sic, and the signal oil port 41 communicates with the piston cavity 8 .

As shown in Figure 4 and Figure 5, the reversing valve 5 includes a valve sleeve 51, a valve core 52 and a valve body 53, and between the valve body 53 and the valve core 52, a control chamber S, a high-pressure oil supply chamber P, The outlet cavity A, the oil return cavity T and the balance cavity C, the control cavity S are set at one end of the spool 52, and the other end of the spool 52 is set with a balance cavity C, and the balance cavity C communicates with the high-pressure oil supply cavity P.

The valve body 53 is provided with an oil inlet 511 communicated with the high pressure oil supply chamber P, an oil outlet 512 communicated with the outlet chamber A and an oil return port 513 communicated with the oil return chamber T, the oil inlet 511 and The piston front chamber 7 is connected to the system oil supply port, the oil outlet 512 is connected to the piston rear chamber 9 , and the oil return port 513 is connected to the piston middle chamber 8 .

Only one partition 521 is set on the valve core 52, and the partition 521 is arranged between the high-pressure oil supply chamber P and the oil return chamber T. When the partition 521 moves to different positions with the valve core 52, the outlet The mouth A is separated from or communicated with the high-pressure oil supply chamber P and the oil return chamber T.

As shown in Figure 6, when the return stroke of the impact piston 3 begins, the spool 52 is in the left position, the oil outlet 512 is closed, and the high-pressure oil supplied to the hydraulic rock drilling machine system enters the high-pressure oil supply chamber P and the piston front chamber 7 through the pipeline. The high-pressure oil supply chamber P communicates with the balance chamber C. Under the action of the balance chamber C, the spool 52 keeps the left position still. At the same time, the piston middle chamber 8, the oil return chamber T and the piston rear chamber 9 return oil, that is, the piston The hydraulic pressure in the rear cavity 9 is close to 0, and the impact piston 3 is accelerated in the return stroke under the action of the high-pressure oil in the piston front cavity 7 . When the impact piston 3 accelerates through the return stroke Sc, the signal oil port 41 communicates with the piston front chamber 7, and the high-pressure oil in the piston front chamber 7 is fed back to the control chamber of the reversing valve 5 through the signal oil port 41 and the feedback oil circuit 6 S, so that the hydraulic force of the control chamber S plus the hydraulic force of the high-pressure oil supply chamber P is greater than the hydraulic force of the balance chamber C, and the spool 52 moves to the right under the action of the hydraulic pressure to start the return commutation until the valve When the core 52 moves to the right limit position, during this process, the channel between the outlet cavity A and the oil return cavity T is gradually closed, and at the same time, the septum 521 gradually opens the channel between the outlet cavity A and the high-pressure oil supply cavity P, The outlet chamber A outputs high-pressure oil to the piston rear chamber 9 through the oil outlet 512, and when the spool 52 moves to the neutral position, the impact piston 3 starts backstroke braking. As the spool 52 continues to reverse direction, the outlet cavity A communicates with the high-pressure oil supply cavity P, so that both the piston front cavity 7 and the piston rear cavity 9 are connected with high-pressure oil, because the hydraulic effective area of the piston rear cavity is larger than the piston front cavity hydraulic pressure The effective area of action makes the differential connection between the piston front chamber 7 and the piston rear chamber 9, and the impact piston 3 continues the return braking. When the spool 52 completes the return commutation and is at the right limit position and is still, the return speed of the impact piston 3 drops to zero.

When the spool 52 is at the right limit position and remains still, the piston front chamber 7 and the piston rear chamber 9 are still differentially connected, but since the hydraulic effective area of the piston rear chamber is larger than the piston front chamber hydraulic effective area, the piston rear chamber 9 The hydraulic pressure is greater than the hydraulic pressure of the front chamber 7 of the living chamber, and the impact piston 3 starts to accelerate its stroke. When the first annular boss 31 of the impact piston 3 crosses the right side of the signal oil port 41 to control the stroke Sic, the signal oil port 41 It communicates with the piston middle chamber 8, and the low-pressure oil in the piston middle chamber 8 enters the control chamber S of the reversing valve 5 through the feedback oil circuit 6. Since the hydraulic force of the high-pressure oil supply chamber P is smaller than that of the balance chamber C, the spool 52 moves to the left so that the channel between the outlet cavity A and the high-pressure oil supply cavity P is gradually closed, and the outlet cavity A and the oil return cavity T are gradually connected. At the same time, the septum 521 gradually closes the outlet cavity A and the high-pressure oil supply cavity P, When the spool 52 moves to the neutral position, the impact piston 3 obtains the maximum speed and completes striking, and the spool 52 continues to move to the left extreme position to complete the stroke reversing. Then start the next return journey.

As shown in Figure 7, the second embodiment of the signal oil output structure of the impact cylinder of the hydraulic rock drill of the present invention is roughly the same as the first embodiment, the only difference is that the signal oil port 41 is included in the impact cylinder 4 The first groove 42 provided on the top, the signal oil port 41 communicates with the first groove 42 . When the impact piston 3 returns, when the distance between the left side of the first groove 311 and the left side of the first annular boss 31 is equal to the return control stroke Sc of the hydraulic rock drill, the return control stroke Sc starts , after the return stroke control stroke Sc ends, the piston front cavity 7 communicates with the control cavity S of the reversing valve 5 through the signal oil port 41 and the feedback oil circuit 6; When the side is flush with the right side of the signal oil port 41, the stroke control stroke Sic starts, and after the stroke control stroke Sic ends, the piston cavity 8 passes through the signal oil port 41, the feedback oil circuit 6 and the reversing valve 5. The control chamber S communicates.

As shown in Figure 8, the second embodiment of the signal oil output structure of the impact cylinder of the hydraulic rock drill of the present invention is roughly the same as the first embodiment, the only difference is that the left side of the first annular boss 31 is set to be the same as the first embodiment. There is a second groove 311 communicating with the piston front chamber 7, and a third groove 312 communicating with the piston middle chamber 8 is provided on the right side of the first annular boss 31. When the impact piston 3 returns, when the distance between the right side of the second groove 311 and the left side of the signal oil port 41 is equal to the return control stroke Sc of the hydraulic rock drill, the return control stroke Sc starts, and the return stroke After the control stroke Sc ends, the piston front chamber 7 communicates with the control chamber S of the reversing valve 5 through the second groove 311, the signal oil port 41, and the feedback oil passage 6; when the impact piston 3 strokes, when the third groove When the left side of 312 is flush with the right side of the signal oil port 41, the stroke control stroke Sic starts, and after the stroke control stroke Sic ends, the piston cavity 8 passes through the third groove 312, the signal oil port 41, the feedback The oil passage 6 communicates with the control chamber S of the reversing valve 5 .

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can utilize the technology disclosed above without departing from the scope of the technical solution of the present invention. Contents Many possible changes and modifications are made to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

A signal oil output structure of an impact cylinder of a hydraulic rock drill, comprising an impact cylinder, an impact piston and a reversing valve, the impact piston is installed in the impact cylinder, and the impact piston is arranged to cooperate with the impact cylinder The connected first annular boss and the second annular boss make the piston front cavity, piston middle cavity and piston rear cavity formed between the impact piston and the impact cylinder. It is characterized in that the impact cylinder There is only one signal oil port connected to the control chamber of the reversing valve, and when the impact piston returns, after the impact piston completes the return stroke Sc before the left side of the signal oil port, the signal The oil port communicates with the front cavity of the piston; when the impact piston strokes, the impact piston starts from the right side of the signal oil port and completes the stroke control stroke Sic, and the signal oil port is connected to the center of the piston. cavities connected.
The signal oil output structure of the impact cylinder of a hydraulic rock drill according to claim 1, wherein the signal oil port includes a first groove provided on the impact cylinder, and the signal oil port is connected to the first groove. connected by a groove.
The signal oil output structure of the impact cylinder of a hydraulic rock drill according to claim 1, wherein a second groove communicating with the piston front cavity is provided on the left side of the first annular boss.
The signal oil output structure of the impact cylinder of a hydraulic rock drill according to claim 1, wherein a third groove communicating with the piston cavity is provided on the right side of the first annular boss.
The signal oil output structure of the impact cylinder of the hydraulic rock drill according to claim 2, wherein a bushing is arranged between the impact piston and the impact cylinder, and the piston front chamber, piston middle chamber and piston rear chamber It is arranged between the bush and the impact piston, and the first groove is arranged on the bush.