Rock drilling percussion hydraulic control valve group and rock drill

Abstract

The utility model discloses a kind of rock drilling impact hydraulic control valve groups and rock drill, including valve body and the electromagnetic reversing valve of being arranged in valve body, one-way flow limiting unit, on-off control unit and first overflow control unit, pressure oil port P1 with the P port of electromagnetic reversing valve, the oil inlet of on-off control unit and the oil inlet of first overflow control unit are communicated, drain port L with the T port of electromagnetic reversing valve, the oil outlet of one-way flow limiting unit, the oil outlet of first overflow control unit are communicated, working oil port A1 with the oil outlet of on-off control unit and the oil inlet of one-way flow limiting unit are communicated, the B port of electromagnetic reversing valve is respectively with the control oil port LS of one-way flow limiting unit, the control oil port LS of on-off control unit is communicated, the A port of electromagnetic reversing valve is blocked, electromagnetic reversing valve is used to control the unloading and loading of the control oil of on-off control unit and the unloading and loading of the control oil of one-way flow limiting unit respectively, one-way flow limiting unit is used to close when control oil is high pressure oil and open when no pressure.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular, to a rock drilling impact hydraulic control valve assembly. Furthermore, this utility model also relates to a rock drill including the aforementioned rock drilling impact hydraulic control valve assembly. Background Technology

[0002] In existing technologies, hydraulic directional valves with a slide valve structure are mainly used to control the on / off of the rock drill impact oil circuit. After the rock drill impact oil circuit is cut off, there will be residual pressure. Furthermore, after long-term use, the gap between the valve core and the valve body of the hydraulic directional valve will increase, resulting in a large amount of hydraulic oil leakage. The high-pressure oil in the rock drill buffer oil circuit will leak through the inside of the rock drill to the rock drill impact oil circuit, resulting in a slight impact problem even after drilling stops.

[0003] For example, the existing technology, such as the technical solution disclosed in announcement number CN222277067U, effectively solves the problem of residual pressure in the working oil circuit and slight impact after drilling stops due to valve core leakage or leakage in the rock drill's buffer oil circuit by connecting a throttle valve and an electro-proportional relief valve in parallel after the hydraulic directional valve. However, the following problems exist:

[0004] (1) Because the LS control oil is taken from the hydraulic directional valve, the pump outlet pressure is controlled by the electro-proportional relief valve after the hydraulic directional valve. When the hydraulic directional valve is in the normal position, there is no pressure at the LS port. After the electromagnetic directional valve is switched, the hydraulic directional valve cannot be switched due to insufficient control oil pressure, and the LS port still has no pressure, which leads to the inability to establish the pump outlet pressure.

[0005] (2) Adjusting the pressure of the relief valve requires blocking the working oil port A1 pipeline, which increases the difficulty of debugging and troubleshooting. Utility Model Content

[0006] This utility model provides a rock drilling impact hydraulic control valve group and a rock drill to solve the technical problems in the prior art where, after the electromagnetic directional valve of the rock drill hydraulic control valve group is switched, the hydraulic directional valve cannot be switched due to insufficient control oil pressure, resulting in no pressure at the LS port, which in turn leads to the inability to establish pump outlet pressure, residual pressure in the working oil circuit after the on-off valve is cut off, and leakage of the rock drill buffer oil and on-off valve, resulting in impact.

[0007] According to one aspect of this utility model, a rock drilling impact hydraulic control valve assembly is provided, comprising a valve body serving as a structural carrier and an electromagnetic directional valve, a one-way flow limiting unit, an on / off control unit, and a first overflow control unit disposed on the valve body. The valve body is provided with a pressure port P1, a control port LS, a return port T1, a drain port L, and a working port A1. The pressure port P1 is connected to the P port of the electromagnetic directional valve, the inlet port of the on / off control unit, and the inlet port of the first overflow control unit. The drain port L is connected to the T port of the electromagnetic directional valve and the outlet port of the one-way flow limiting unit. The oil port is connected to the oil outlet of the first overflow control unit. The working oil port A1 is connected to the oil outlet of the on / off control unit and the oil inlet of the one-way flow limiting unit. The B port of the electromagnetic reversing valve is connected to the control oil port LS of the one-way flow limiting unit and the control oil port LS of the on / off control unit, respectively. The A port of the electromagnetic reversing valve is blocked. The electromagnetic reversing valve is used to control the unloading and loading of the control oil of the on / off control unit and the unloading and loading of the control oil of the one-way flow limiting unit, respectively. The one-way flow limiting unit is used to close when the control oil is high pressure oil and open when there is no pressure.

[0008] As a further improvement to the above technical solution, the valve body is also provided with a second overflow control unit. The oil inlet of the second overflow control unit is connected to the pressure oil port P1, and the oil return port T1 is connected to the oil outlet of the second overflow control unit. The second overflow control unit is used to limit the maximum pressure of the pressure oil port P1.

[0009] As a further improvement to the above technical solution, the valve body is provided with a first pressure measuring port MP1 for detecting the pressure of port P, a second pressure measuring port MP2 for detecting the control oil pressure of port LS, and a third pressure measuring port MP3 for detecting the pressure of working oil port A1.

[0010] As a further improvement to the above technical solution, the valve body is also provided with a first throttle valve and a second throttle valve. The two ends of the first throttle valve are respectively connected to the working oil port A1 and the oil inlet of the one-way flow limiting unit, and the two ends of the second throttle valve are respectively connected to the pressure oil port P1 and the oil inlet of the first overflow control unit.

[0011] As a further improvement to the above technical solution, the on / off control unit includes a logic valve with a cone valve structure.

[0012] As a further improvement to the above technical solution, the first overflow control unit includes an electro-proportional overflow valve.

[0013] As a further improvement to the above technical solution, the unidirectional flow limiting unit includes a pilot-operated one-way valve.

[0014] According to another aspect of the present invention, a rock drill is also provided, which includes the above-mentioned rock drilling impact hydraulic control valve group.

[0015] This utility model has the following beneficial effects:

[0016] During operation, under no-load conditions, pressurized oil enters through the pressure port P1 of the valve body. One path of pressurized oil reaches the inlet of the on / off control unit, which is in the right position as shown in the diagram, preventing the pressurized oil from passing through. Another path of pressurized oil reaches the P port of the solenoid directional valve, which is in the left position as shown in the diagram under the action of the spring force. The pressurized oil then reaches the A port through the P port of the solenoid directional valve, which is blocked. A third path reaches the first overflow control unit, and through the first overflow control unit, it reaches the drain port L and returns to the oil tank. The hydraulic system is in a standby no-load state, and the pump outlet pressure is low.

[0017] During impact operation, when switching from no-load to impact operation, the first overflow control unit and the solenoid directional valve are simultaneously energized. At this time, the solenoid directional valve operates in the right position, and the second pressure oil flows through the P port of the solenoid directional valve to the B port, and then enters the control oil port LS of the on / off control unit and the control oil port LS of the one-way flow limiting unit respectively. The on / off control unit operates in the left position under the action of the control oil, and at this time, the oil inlet and outlet of the on / off control unit are connected. The first pressure oil enters the working oil port A1 through the on / off control unit. The one-way flow limiting unit is closed under the action of the control oil, and the oil inlet and outlet of the one-way flow limiting unit are not connected. The pressure of the third pressure oil control port LS is controlled by the first overflow control unit, thereby controlling the pump outlet pressure.

[0018] When the rock drill needs to stop impact operation during shutdown, the solenoid directional valve is de-energized and switches to the left position. At this time, the control oil of the one-way flow limiting unit and the control oil of the on / off control unit enter the T port through the B port of the solenoid directional valve and then return to the oil tank. When the on / off control unit resets to the right position, the channel of the third pressure oil to the working oil port A1 is cut off, the rock drill stops working, and the hydraulic system returns to the no-load state. The one-way flow limiting unit opens, and the pressure oil in the working oil circuit returns to the oil tank through the one-way flow limiting unit. When the rock drill is working, there will be residual pressure after the working oil circuit is cut off. At the same time, the commonly used directional valve for controlling the on / off of the working oil circuit is a hydraulic control directional valve with a slide valve structure. After long-term use, the gap between the valve core and the valve hole becomes larger, and the leakage is large. The high pressure oil in the rock drill's buffer oil circuit will leak through the inside of the rock drill to the rock drill's impact oil circuit. The pressure oil is released by setting up the one-way flow limiting unit.

[0019] This rock drilling impact hydraulic control valve group integrates the hydraulic valves controlling the rock drill impact into the valve body, achieving a high degree of integration and reducing the number of connected hydraulic pipelines, thereby effectively reducing leakage and malfunctions. Through the combined use of electromagnetic directional valves, logic valves, and pilot-operated check valves, it enables no-load, impact operation, and drilling stop of the rock drill impact. A parallel one-way flow limiting unit at working port A1 releases residual pressure in the working oil circuit and impact pressure caused by valve core leakage or rock drill buffer circuit leakage during drilling stop, ensuring normal operation, operational stability, and service life. The control oil circuit for pump pressure and the first overflow control unit draw oil from the valve before the on / off control unit, facilitating adjustment and troubleshooting of the second overflow control unit. Simultaneously, when switching from no-load to impact operation, it effectively controls the pump outlet pressure, preventing situations where insufficient pressure at control port LS prevents the logic valve from switching, resulting in no hydraulic pressure at control port LS and the inability to build up pump outlet pressure.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a simplified structural diagram of the rock drilling and impact hydraulic control valve group according to a preferred embodiment of the present invention.

[0023] Legend:

[0024] 1. Valve body; 2. Second overflow control unit; 3. Solenoid directional valve; 4. One-way flow limiting unit; 5. First throttle valve; 6. On / off control unit; 7. Second throttle valve; 8. First overflow control unit; P1, pressure port; LS, control port; T1, return port; L, drain port; A1, working port; MP1, first pressure test port; MP2, second pressure test port; MP3, third pressure test port. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0026] Figure 1 This is a simplified structural diagram of the rock drilling and impact hydraulic control valve group according to a preferred embodiment of the present invention.

[0027] like Figure 1As shown, the rock drilling impact hydraulic control valve group of this embodiment includes a valve body 1 serving as a structural carrier and an electromagnetic directional valve 3, a one-way flow limiting unit 4, an on / off control unit 6, and a first overflow control unit 8 disposed on the valve body 1. The valve body 1 is provided with a pressure port P1, a control port LS, a return port T1, a drain port L, and a working port A1. The pressure port P1 is connected to the P port of the electromagnetic directional valve 3, the inlet port of the on / off control unit 6, and the inlet port of the first overflow control unit 8. The drain port L is connected to the T port of the electromagnetic directional valve 3 and the outlet port of the one-way flow limiting unit 4. The oil outlet of the first overflow control unit 8 is connected, the working oil port A1 is connected to the oil outlet of the on / off control unit 6 and the oil inlet of the one-way flow limiting unit 4, the B port of the electromagnetic reversing valve 3 is connected to the control oil port LS of the one-way flow limiting unit 4 and the control oil port LS of the on / off control unit 6 respectively, the A port of the electromagnetic reversing valve 3 is blocked, the electromagnetic reversing valve 3 is used to control the unloading and loading of the control oil of the on / off control unit 6 and the unloading and loading of the control oil of the one-way flow limiting unit 4 respectively, and the one-way flow limiting unit 4 is used to close when the control oil is high pressure oil and open when there is no pressure.

[0028] In some embodiments, such as Figure 1 As shown, a second overflow control unit 2 is also provided on the valve body 1. The oil inlet of the second overflow control unit 2 is connected to the pressure oil port P1, and the oil return port T1 is connected to the oil outlet of the second overflow control unit 2. The second overflow control unit 2 is used to limit the maximum pressure of the pressure oil port P1. Specifically, when the pressure of the pressure oil port P1 reaches the set pressure of the second overflow unit, the excess oil returns to the oil tank through the second overflow unit. The second overflow unit limits the maximum pressure of the pressure oil port P1 to protect the hydraulic system. The second overflow control unit 2 is implemented using an overflow valve of existing technology.

[0029] This rock drilling impact hydraulic control valve assembly is used in rock drills, and its working principle is as follows:

[0030] During operation, under no-load conditions, pressurized oil enters through the pressure port P1 of valve body 1. One path of pressurized oil reaches the inlet of the on / off control unit 6, which is in the right position as shown in the diagram, preventing the pressurized oil from passing through. Another path of pressurized oil reaches the P port of the solenoid directional valve 3, which is in the left position as shown in the diagram under the action of spring force. The pressurized oil then reaches port A through the P port of the solenoid directional valve 3, which is blocked. A third path reaches the first overflow control unit 8, and then returns to the oil tank through the drain port L. The hydraulic system is in a standby no-load state, and the pump outlet pressure is low.

[0031] During impact operation, when switching from no-load to impact operation, the first overflow control unit 8 and the solenoid directional valve 3 are simultaneously energized. At this time, the solenoid directional valve 3 operates in the right position, and the second pressure oil reaches the B port through the P port of the solenoid directional valve 3, and then enters the control oil port LS of the on / off control unit 6 and the control oil port LS of the one-way flow limiting unit 4 respectively. The on / off control unit 6 operates in the left position under the action of the control oil. At this time, the oil inlet and outlet of the on / off control unit 6 are connected. The first pressure oil enters the working oil port A1 through the on / off control unit 6. The one-way flow limiting unit 4 is closed under the action of the control oil, and the oil inlet and outlet of the one-way flow limiting unit 4 are not connected. The pressure of the third pressure oil control port LS is controlled by the first overflow control unit 8, thereby controlling the pump outlet pressure.

[0032] When the rock drill needs to stop impact operation under shutdown conditions, the solenoid directional valve 3 is de-energized and switches to the left position. At this time, the control oil of the one-way flow limiting unit 4 and the control oil of the on / off control unit 6 enter the T port through the B port of the solenoid directional valve 3 and then return to the oil tank. The on / off control unit 6 resets to the right position, at which time the channel of the third pressure oil to the working oil port A1 is cut off, the rock drill stops working, and the hydraulic system returns to the no-load state. The one-way flow limiting unit 4 opens, and the pressure oil in the working oil circuit returns to the oil tank through the one-way flow limiting unit 4. When the pressure oil port P When the pressure of 1 reaches the set pressure of the second overflow unit, the excess oil returns to the oil tank through the second overflow unit. The second overflow unit limits the maximum pressure of the pressure port P1 to protect the hydraulic system. When the rock drill is working, there will be residual pressure after the working oil circuit is cut off. At the same time, the commonly used directional valve for controlling the opening and closing of the working oil circuit is a hydraulic control directional valve with a slide valve structure. After a long period of use, the gap between the valve core and the valve hole becomes larger, and the leakage is large. The high pressure oil in the rock drill buffer oil circuit will leak through the inside of the rock drill to the rock drill impact oil circuit. The pressure oil is released by setting the one-way flow limiting unit 4.

[0033] This rock drilling impact hydraulic control valve group integrates the hydraulic valves controlling the rock drill impact into the valve body 1, achieving a high degree of integration and reducing the number of connected hydraulic pipelines, thereby effectively reducing leakage and malfunctions. Through the combined use of the solenoid directional valve 3, logic valve, and pilot-operated check valve, it enables the rock drill impact during no-load, impact operation, and drilling stop. The parallel one-way flow limiting unit 4 at the working port A1 releases residual pressure in the working oil circuit and impact pressure caused by valve core leakage or rock drill buffer oil circuit leakage during drilling stop, ensuring normal construction, operational stability, and service life. The control oil circuit controlling the pump pressure and the first overflow control unit 8 draw oil from the valve in front of the on / off control unit 6, facilitating the adjustment and troubleshooting of the second overflow control unit 2. Simultaneously, when switching from no-load to impact operation, it effectively controls the pump outlet pressure, preventing situations where insufficient pressure at the control port LS prevents the logic valve from switching, resulting in no hydraulic pressure at the control port LS and the inability to build up pump outlet pressure.

[0034] In some embodiments, such as Figure 1 As shown, the valve body 1 is equipped with a first pressure test port MP1 for detecting the pressure at port P, a second pressure test port MP2 for detecting the control oil pressure at port LS, and a third pressure test port MP3 for detecting the pressure at working port A1. By setting pressure test ports at each key port, it is easier to troubleshoot in subsequent applications.

[0035] In some embodiments, such as Figure 1 As shown, the valve body 1 is also provided with a first throttle valve 5 and a second throttle valve 7. The two ends of the first throttle valve 5 are respectively connected to the working oil port A1 and the oil inlet of the one-way flow limiting unit 4, and the two ends of the second throttle valve 7 are respectively connected to the pressure oil port P1 and the oil inlet of the first overflow control unit 8.

[0036] In some embodiments, such as Figure 1 As shown, the on / off control unit 6 includes a logic valve with a cone valve structure; specifically, the logic valve with a cone valve structure controls the on / off of the working oil circuit, which is equivalent to a hydraulic control check valve with a valve slide structure, with less leakage and higher reliability.

[0037] In some embodiments, such as Figure 1 As shown, the first overflow control unit 8 includes an electro-proportional overflow valve. By giving different control signals to the electro-proportional overflow valve, different overflow pressures are set, thereby controlling the pump outlet pressure and achieving the requirement of matching the rock drilling impact pressure under different working conditions, which has strong adaptability.

[0038] In some embodiments, such as Figure 1As shown, the one-way flow limiting unit 4 includes a pilot-operated one-way valve. Specifically, when the rock drill is working, there will be residual pressure after the working oil circuit is cut off. At the same time, the commonly used directional valve for controlling the opening and closing of the working oil circuit is a hydraulically controlled directional valve with a slide valve structure. After long-term use, the gap between the valve core and the valve hole becomes larger, resulting in a large leakage. The high-pressure oil in the rock drill's buffer oil circuit will leak through the inside of the rock drill to the rock drill's impact oil circuit. The pressure oil can be directly released by the pilot-operated one-way valve. In other embodiments, the one-way flow limiting unit 4 can also be other hydraulic valves that can realize the oil circuit being closed in the working state and open in the working oil circuit being cut off, such as a directional valve.

[0039] On the other hand, a preferred embodiment of the present invention also provides a rock drill that uses the above-mentioned rock drilling impact hydraulic control valve group.

[0040] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic control valve assembly for rock drilling impact, characterized in that, The system includes a valve body (1) serving as a structural carrier, and an electromagnetic directional valve (3), a one-way flow limiting unit (4), an on / off control unit (6), and a first overflow control unit (8) disposed on the valve body (1). The valve body (1) is provided with a pressure port P1, a control port LS, a return port T1, a drain port L, and a working port A1. The pressure port P1 is connected to the P port of the electromagnetic directional valve (3), the inlet port of the on / off control unit (6), and the inlet port of the first overflow control unit (8). The drain port L is connected to the T port of the electromagnetic directional valve (3), the outlet port of the one-way flow limiting unit (4), and the first overflow control unit. (8) is connected to the oil outlet. The working oil port A1 is connected to the oil outlet of the on / off control unit (6) and the oil inlet of the one-way flow limiting unit (4). The B port of the electromagnetic reversing valve (3) is connected to the control oil port LS of the one-way flow limiting unit (4) and the control oil port LS of the on / off control unit (6) respectively. The A port of the electromagnetic reversing valve (3) is blocked. The electromagnetic reversing valve (3) is used to control the unloading and loading of the control oil of the on / off control unit (6) and the unloading and loading of the control oil of the one-way flow limiting unit (4) respectively. The one-way flow limiting unit (4) is used to close when the control oil is high pressure oil and open when there is no pressure.

2. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The valve body (1) is also provided with a second overflow control unit (2). The oil inlet of the second overflow control unit (2) is connected to the pressure oil port P1, and the oil return port T1 is connected to the oil outlet of the second overflow control unit (2). The second overflow control unit (2) is used to limit the maximum pressure of the pressure oil port P1.

3. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The valve body (1) is provided with a first pressure measuring port MP1 for detecting the pressure of port P, a second pressure measuring port MP2 for detecting the control oil pressure of port LS, and a third pressure measuring port MP3 for detecting the pressure of working oil port A1.

4. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The valve body (1) is also provided with a first throttle valve (5) and a second throttle valve (7). The two ends of the first throttle valve (5) are respectively connected to the working oil port A1 and the oil inlet of the one-way flow limiting unit (4). The two ends of the second throttle valve (7) are respectively connected to the pressure oil port P1 and the oil inlet of the first overflow control unit (8).

5. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The on / off control unit (6) includes a logic valve with a cone valve structure.

6. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The first overflow control unit (8) includes an electro-proportional overflow valve.

7. The rock drilling impact hydraulic control valve assembly according to claim 1, characterized in that, The one-way flow limiting unit (4) includes a pilot-operated one-way valve.

8. A rock drill, characterized in that, The application has the rock drilling impact hydraulic control valve assembly as described in any one of claims 1-7.

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