阅读说明：本技术 一种冲击液压控制系统及凿岩台车 (Impact hydraulic control system and drill jumbo ) 是由 刘伟 廖金军 康磊 柳得帅 张玉良 曾庆峰 胡鑫乐 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种冲击液压控制系统,包括：液压泵、第一换向阀、第二换向阀、非平衡锥阀、梭阀和多路阀,液压泵通过出油管路与多路阀连接,执行机构通过非平衡锥阀连接在出油管路上,液压泵的负载敏感油路通过梭阀与第一换向阀连接,第一换向阀与第二换向阀连接,第二换向阀连接在出油管路上,第二换向阀还与非平衡锥阀连接。通过第一换向阀和第二换向阀的换向,结合非平衡锥阀的启闭动作,可实现臂架模式与凿岩模式两种不同压力等级的工作模式,在切换至凿岩模式时,执行机构可以开启液压冲击,而且压力损失较小,减少了系统发热,提高了系统效率。在凿岩模式下,执行机构冲击的同时可进行凿岩台车的其它辅助动作。(The invention discloses an impact hydraulic control system, comprising: the hydraulic pump is connected with the multi-way valve through an oil outlet pipeline, the actuating mechanism is connected with the oil outlet pipeline through the unbalanced cone valve, a load sensitive oil circuit of the hydraulic pump is connected with the first reversing valve through the shuttle valve, the first reversing valve is connected with the second reversing valve, the second reversing valve is connected with the oil outlet pipeline, and the second reversing valve is further connected with the unbalanced cone valve. The reversing of first switching-over valve and second switching-over valve combines the action of opening and close of unbalanced cone valve, can realize the mode of cantilever crane mode and rock drilling mode two kinds of different pressure levels's operating mode, and when switching over to rock drilling mode, actuating mechanism can open hydraulic shock, and pressure loss is less moreover, has reduced the system and has generated heat, has improved system efficiency. In the drilling mode, the actuator impacts while other auxiliary actions of the drill jumbo are performed.)

1. An impact hydraulic control system, comprising: the hydraulic pump (2), a first reversing valve (7), a second reversing valve (9), a non-balance cone valve (5), a shuttle valve (3) and a multi-way valve (13), wherein the hydraulic pump (2) is connected with the multi-way valve (13) through an oil outlet pipeline, an actuating mechanism is connected to the oil outlet pipeline through the non-balance cone valve (5), a load sensitive oil circuit of the hydraulic pump (2) is connected with the first reversing valve (7) through the shuttle valve (3), the first reversing valve (7) is connected with the second reversing valve (9), the second reversing valve (9) is connected to the oil outlet pipeline, and the second reversing valve (9) is further connected with the non-balance cone valve (5);

when the first reversing valve (7) and the second reversing valve (9) are not communicated and the second reversing valve (9) is communicated with the oil outlet pipeline, pressure oil of the oil outlet pipeline closes an oil inlet and an oil outlet of the unbalanced cone valve (5) through the second reversing valve (9), and a load sensitive oil way of the hydraulic pump (2) is communicated with an oil tank (14) through the shuttle valve (3) and the first reversing valve (7);

when the first reversing valve (7) is communicated with the second reversing valve (9) and the second reversing valve (9) is communicated with the oil outlet pipeline, pressure oil of the oil outlet pipeline closes an oil inlet and an oil outlet of the unbalanced cone valve (5) through the second reversing valve (9), and is conveyed to the first reversing valve (7) through the second reversing valve (9) and fed back to a load sensitive oil way of the hydraulic pump (2) through the shuttle valve (3);

when the first reversing valve (7) is communicated with the second reversing valve (9) and the second reversing valve (9) is not communicated with the oil outlet pipeline, pressure oil of the oil outlet pipeline is communicated with an oil inlet and an oil outlet of the unbalanced cone valve (5) so as to be conveyed to the actuating mechanism.

2. The percussion hydraulic control system according to claim 1, further comprising a first overflow valve (8), the first overflow valve (8) being connected to the first direction changing valve (7), the first overflow valve (8) being connected to the tank (14), the shuttle valve (3) being connected between the first overflow valve (8) and the first direction changing valve (7).

3. The impact hydraulic control system according to claim 1, further comprising a proportional overflow valve (10), wherein an oil inlet of the proportional overflow valve (10) is connected to an oil path between the unbalanced cone valve (5) and the actuator, and an oil outlet of the proportional overflow valve (10) is connected to an oil tank (14).

4. A percussion hydraulic control system according to claim 3, further comprising a second spill valve (11) connected in parallel with the proportional spill valve (10).

5. The percussion hydraulic control system according to claim 3, characterized in that the oil inlet of the proportional relief valve (10) is connected to the oil path between the unbalanced cone valve (5) and the actuator via a first damping valve (4).

6. The percussion hydraulic control system according to claim 5, characterized in that the oil inlet of the proportional relief valve (10) is also connected to a load-sensitive oil circuit of the hydraulic pump (2) via the shuttle valve (3).

7. The percussion hydraulic control system according to claim 1, characterized in that the first directional control valve (7) is connected to the second directional control valve (9) via a second damping valve (6).

8. The percussion hydraulic control system according to claim 1, characterized in that the first and second directional valves (7, 9) are two-position three-way valves.

9. The percussion hydraulic control system according to claim 1, characterized in that the first and second directional valves (7, 9) are electromagnetic directional valves.

10. A rock drilling rig comprising an impact hydraulic control system as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of engineering machinery, in particular to an impact hydraulic control system and a drill jumbo comprising the impact hydraulic control system.

Background

The drill jumbo is important drilling equipment in modern drilling and blasting method tunnel construction, has advantages such as drilling efficiency height, factor of safety height, operation environment are good, low in labor strength, and the drill jumbo needs to match different drilling pressure according to different rock operating modes, and often need carry out the posture fine adjustment of cantilever crane in the drill jumbo operation process to guarantee the fashioned accuracy of tunnel.

The hydraulic system of the existing drilling jumbo generally provides power for a single hydraulic pump for a boom system and an impact system at the same time, because the required pressure levels of the two systems are different, and the pressure of the boom system is far greater than the pressure of the impact system, most of the existing drilling impact control systems are valve control systems, namely, a pressure reducing valve is added on an impact loop, the control of different impact pressures is realized by controlling the pressure of an outlet of the pressure reducing valve, and due to the throttling effect of a valve port of the pressure reducing valve, the pressure reducing valve generates large pressure loss, the system generates heat, the system efficiency is reduced, and due to the limitation of mining equipment on the installed power, the rock drill efficiency cannot be furthest exerted by the valve control impact system, so that the mine construction efficiency is influenced.

Disclosure of Invention

It is an object of the present invention to provide an impulse hydraulic control system that reduces the pressure loss of the impulse oil circuit, reduces the heating of the system and improves the efficiency of the system, and a rock-drilling rig comprising such an impulse hydraulic control system.

In order to solve the technical problems, the invention provides the following technical scheme:

an impact hydraulic control system comprising: the hydraulic pump is connected with the multi-way valve through an oil outlet pipeline, the actuating mechanism is connected with the oil outlet pipeline through the unbalanced cone valve, a load sensitive oil circuit of the hydraulic pump is connected with the first reversing valve through the shuttle valve, the first reversing valve is connected with the second reversing valve, the second reversing valve is connected with the oil outlet pipeline, and the second reversing valve is further connected with the unbalanced cone valve;

when the first reversing valve and the second reversing valve are not communicated and the second reversing valve is communicated with the oil outlet pipeline, the pressure oil in the oil outlet pipeline closes the oil inlet and the oil outlet of the unbalanced cone valve through the second reversing valve, and the load sensitive oil way of the hydraulic pump is communicated with the oil tank through the shuttle valve and the first reversing valve;

when the first reversing valve is communicated with the second reversing valve and the second reversing valve is communicated with the oil outlet pipeline, the pressure oil of the oil outlet pipeline closes the oil inlet and the oil outlet of the unbalanced cone valve through the second reversing valve, and the pressure oil of the oil outlet pipeline is conveyed to the first reversing valve through the second reversing valve and then fed back to the load sensitive oil way of the hydraulic pump through the shuttle valve;

when the first reversing valve is communicated with the second reversing valve and the second reversing valve is not communicated with the oil outlet pipeline, the pressure oil of the oil outlet pipeline is communicated with the oil inlet and the oil outlet of the unbalanced cone valve so as to be conveyed to the actuating mechanism.

Preferably, the hydraulic control system further comprises a first overflow valve, the first overflow valve is connected with the first reversing valve, the first overflow valve is connected with the oil tank, and the shuttle valve is connected between the first overflow valve and the first reversing valve.

Preferably, the hydraulic control system further comprises a proportional overflow valve, an oil inlet of the proportional overflow valve is connected to an oil path between the unbalanced cone valve and the actuating mechanism, and an oil outlet of the proportional overflow valve is connected with an oil tank.

Preferably, the proportional pressure control device further comprises a second pressure control valve connected in parallel with the proportional pressure control valve.

Preferably, an oil inlet of the proportional overflow valve is connected to an oil path between the unbalanced cone valve and the actuating mechanism through a first damping valve.

Preferably, the oil inlet of the proportional overflow valve is also connected with the load-sensitive oil circuit of the hydraulic pump through the shuttle valve.

Preferably, the first direction valve is connected with the second direction valve through a second damping valve.

Preferably, the first direction valve and the second direction valve are two-position three-way valves.

Preferably, the first direction valve and the second direction valve are electromagnetic direction valves.

A rock drilling rig comprising a percussion hydraulic control system as claimed in any one of the preceding claims.

Compared with the prior art, the technical scheme has the following advantages:

1. the reversing of first switching-over valve and second switching-over valve combines the action of opening and close of unbalanced cone valve, can realize the mode of cantilever crane mode and rock drilling mode two kinds of different pressure levels's operating mode, and when switching over to rock drilling mode, actuating mechanism can open hydraulic shock, and pressure loss is less moreover, has reduced the system and has generated heat, has improved system efficiency.

2. Through the proportional overflow valve, the multi-stage control can be carried out to hydraulic pump outlet pressure, and the highest output pressure of hydraulic pump can be restricted through the second overflow valve, and then the rock drill is protected.

3. In the rock drilling mode, the actuating mechanism can perform other auxiliary actions of the rock drilling jumbo while impacting, namely, the impact hydraulic control system is a single-pump multi-actuator system, so that the system cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a hydraulic schematic diagram of an impact hydraulic control system according to an embodiment of the present invention.

The reference numbers are as follows:

the hydraulic control system comprises a motor 1, a hydraulic pump 2, a shuttle valve 3, a first damping valve 4, an unbalanced cone valve 5, a second damping valve 6, a first reversing valve 7, a first overflow valve 8, a second reversing valve 9, a proportional overflow valve 10, a second overflow valve 11, a rock drill 12, a multi-way valve 13 and an oil tank 14.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Referring to fig. 1, fig. 1 is a hydraulic schematic diagram of an impact hydraulic control system according to an embodiment of the present invention.

One embodiment of the present invention provides an impact hydraulic control system that may be applied to a drill jumbo, wherein the impact hydraulic control system includes: the hydraulic pump 2, the first switching-over valve 7, the second switching-over valve 9, the unbalanced cone valve 5, the shuttle valve 3 and the multiple-way valve 13 and connecting line, the hydraulic pump 2 is driven by the electrical machinery 1, the hydraulic pump 2 is connected with the multiple-way valve 13 through the oil outlet pipeline, can control the rock drill to push into the cylinder to advance or retreat and other movements of the cantilever crane through the multiple-way valve 13, the actuating mechanism is connected on the oil outlet pipeline through the unbalanced cone valve 5, the actuating mechanism is the action output device of the hydraulic control system, can be the rock drill 12, the connection relation of the above-mentioned hydraulic parts is as follows: the load sensitive oil circuit of the hydraulic pump 2 is connected with a first reversing valve 7 through a shuttle valve 3, the first reversing valve 7 is connected with a second reversing valve 9, the second reversing valve 9 is connected on an oil outlet pipeline, and the second reversing valve 9 is also connected with an unbalanced cone valve 5. The first direction valve 7 and the second direction valve 9 may be electromagnetic direction valves, hydraulic control direction valves, or manual direction valves, preferably electromagnetic direction valves, as shown in fig. 1, and the first direction valve 7 and the second direction valve 9 are two-position three-way valves.

Further, the device also comprises a first overflow valve 8, a second overflow valve 11 and a proportional overflow valve 10, wherein the first overflow valve 8 is connected with the first reversing valve 7, the first overflow valve 8 is connected with an oil tank 14, and the shuttle valve 3 is connected between the first overflow valve 8 and the first reversing valve 7; an oil inlet of the proportional overflow valve 10 is connected to an oil path between the unbalanced cone valve 5 and the actuating mechanism, an oil outlet of the proportional overflow valve 10 is connected with an oil tank 14, the second overflow valve 11 is connected with the proportional overflow valve 10 in parallel, and an oil inlet of the proportional overflow valve 10 is also connected with a load sensitive oil path of the hydraulic pump 2 through the shuttle valve 3. In order to reduce the influence of load fluctuation on the output pressure of the hydraulic pump 2, the oil inlet of the proportional overflow valve 10 is connected to the oil path between the unbalanced cone valve 5 and the actuating mechanism through the first damping valve 4, and the first reversing valve 7 is connected to the second reversing valve 9 through the second damping valve 6.

In order to better understand the working principle of the impact hydraulic system provided by the embodiment of the invention, the working principle is explained as follows with reference to fig. 1:

the motor 1 is started to drive the hydraulic pump 2 to rotate, when the first reversing valve 7 and the second reversing valve 9 are not powered, pressure oil at an X port of a load sensitive oil path of the hydraulic pump 2 is communicated with the oil tank 14 through an I port and an III port of the shuttle valve 3 and a P port and an A port of the first reversing valve 7, the first reversing valve 7 and the second reversing valve are in an unconnected state at the moment, the oil controlled by the X port of the hydraulic pump 2 is in an unloading state, the hydraulic pump 2 is unloaded and started, the hydraulic pump 2 outputs lower pressure oil through an oil outlet pipeline due to lower set pressure of the load sensitive valve of the hydraulic pump 2, and the second reversing valve 9 is communicated with the oil outlet pipeline, so the pressure oil can close an I port of an oil inlet and an II port of an oil outlet of the unbalanced cone valve 5 through the P port and the A port of the second reversing valve, and the rock drill 12 does not have impact action at the moment.

When the first reversing valve 7 is electrified and the second reversing valve 9 is not electrified, the first reversing valve 7 is located at the lower position shown in the figure 1, a port P of the first reversing valve 7 is communicated with a port B, the first reversing valve 7 and the second reversing valve 9 are in a communicated state, pressure oil at the outlet of the hydraulic pump 2 reaches a port III of the unbalanced cone valve 5 through the port P and the port A of the second reversing valve 9, so that the port I and the port II of the unbalanced cone valve 5 are closed, and the rock drill 12 does not have impact action. Meanwhile, pressure oil at the port III of the unbalanced cone valve 5 passes through the second damping valve 6, the port B and the port P of the first reversing valve 7 reach the inlet of the first overflow valve 8, high-pressure oil at the inlet of the first overflow valve 8 is fed back to the port X of the load sensitive oil circuit of the hydraulic pump 2 through the port I and the port III of the shuttle valve 3, the set pressure of the first overflow valve 8 regulates the pressure at the outlet of the hydraulic pump 2, the inlet of the multi-way valve 13 is in a high-pressure state at the moment, the rock drilling trolley can perform forward and backward movement of a rock drilling machine propulsion oil cylinder and normal arm support action posture adjustment, and the system is in an arm support mode at the moment.

When the first reversing valve 7 is electrified, namely the first reversing valve 7 is positioned at the lower position of the figure, after the second reversing valve 9 is electrified, the second reversing valve 9 is reversed to be positioned at the left position of the figure, the pressure oil at the inlet of the first overflow valve 8 passes through the port P and the port B of the first reversing valve 7, the port A and the port T of the second damping valve 6 and the second reversing valve 9 are communicated with an oil tank, and at the moment, the end III control oil of the unbalanced cone valve 5 passes through the port A and the port T of the second reversing valve 9 to be communicated with the oil tank for unloading. The pressure oil at the outlet of the hydraulic pump 2 reaches the I port of the unbalanced cone valve 5, the pressure oil overcomes the spring force to open the valve port of the unbalanced cone valve 5, thus, the pressure oil reaches the rock drill 12 through the I port and the II port of the unbalanced cone valve 5, the rock drill 12 starts the impact action, meanwhile, pressure oil at the second port of the unbalanced cone valve 5 reaches inlets of a proportional overflow valve 10 and a second overflow valve 11 through a first damper 4, pressure oil at the inlet of the proportional overflow valve 10 reaches an X port of a hydraulic pump 2 through the second port and a third port of a shuttle valve 3, by giving different currents to the proportional relief valve 10 different pressures can be controlled to be delivered by the hydraulic pump 2, the outlet pressure of the hydraulic pump 2 can be controlled in multiple stages, so that the rock drill 12 can obtain different rock drilling pressures to adapt to different rock working conditions, the pressure loss of an impact oil way is reduced, the heating of a hydraulic system is reduced, and the efficiency of the hydraulic system is improved. And the outlet of the hydraulic pump 2 is communicated with the multi-way valve 13, so that other auxiliary actions of the rock drilling jumbo, such as the advancing and retreating of the advancing oil cylinder of the rock drilling machine, the fine adjustment of the posture of the arm support and the like, can be performed while rock drilling. The second overflow valve 11 limits the maximum output pressure of the hydraulic pump 2 in the mode so as to avoid that the output pressure of the hydraulic pump 2 is too high and the rock drilling machine 12 is damaged due to the fact that the proportional overflow valve 10 is in failure or the given current is too large, and the system is in a rock drilling mode at the moment.

In addition, the switching between the boom mode and the rock drilling mode of the impact hydraulic control system can be realized through the first reversing valve 7 and the second reversing valve 9, the opening and the closing of the unbalanced cone valve 5 are used for controlling the starting and the stopping actions of the rock drill 12, and in the rock drilling mode, the rock drill 12 can impact and simultaneously perform other auxiliary actions of the drill jumbo, namely the hydraulic system is a single-pump multi-actuator system, so that the cost of the hydraulic system is reduced.

The embodiment of the invention also provides a drill jumbo, which comprises the impact hydraulic control system provided by any one of the embodiments, and the beneficial effects of the drill jumbo can be achieved by referring to the impact hydraulic control system, which is not described herein again.

In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.