Impact hydraulic control valve group of rock drill and rock drill

Abstract

The utility model provides a rock drill impact hydraulic control valve group and a rock drill, the valve group comprises a hydraulic control reversing valve, a first throttling hole, an electric proportional overflow valve, an overflow valve, a second throttling hole, a valve body and an electromagnetic reversing valve, the valve body is provided with a pressure oil port P, an oil return port T, an oil drainage port L, an LS oil port and a working oil port A; the pressure oil port P is communicated with an oil inlet of the overflow valve and an oil inlet of the second throttling hole through a hole channel in the valve body. An oil outlet of the second throttling hole is communicated with an oil inlet of the electromagnetic reversing valve; a working oil port of the electromagnetic reversing valve is communicated with a control oil port of the hydraulic control reversing valve; the oil return port T is communicated with an oil outlet of the overflow valve; and the oil drainage port L is communicated with an oil drainage port of the electromagnetic reversing valve, and is communicated with an oil drainage port of the hydraulic control reversing valve, an oil outlet of the electric proportional overflow valve and a control oil port at the same time. Damage of pressure building to a system and elements is eliminated, and residual impact pressure existing after oil cut-off is eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery and equipment, and in particular, to a rock drill impact hydraulic control valve group and a rock drill. Background Art

[0002] The existing rock drill impact hydraulic valve group mainly realizes the on-off of the pressure oil of the impact action through the control of the control valve, so as to realize the switching of the action and stop of the rock drill impact mechanism. In the specific control, a hydraulically controlled reversing valve is used to realize the connection and disconnection of the impact oil circuit, and the control oil circuit of the valve body spring chamber is connected and disconnected with the pressure oil through the electromagnetic reversing valve. Therefore, the electromagnetic reversing valve plays the role of enabling control. When the electromagnet on the electromagnetic valve is energized, the impact mechanism performs the impact action. When the electromagnet on the electromagnetic valve loses power, the impact mechanism stops the impact action.

[0003] When the rock drill is in operation, the impact hydraulic system may experience overshoot or high impact pressure fluctuations, or the variable pump swash plate may become stuck when drilling is stopped, causing pressure buildup. The principle of the existing rock drill impact hydraulic valve group cannot eliminate the damage to the system and components caused by pressure buildup; in addition, after the hydraulically controlled reversing valve connected to the actuator oil port cuts off the pressure oil, pressure oil will leak from the clearance between the valve core and the valve body, resulting in a smaller impact pressure after the actuator pressure is cut off, and the rock drill is accompanied by a slight knocking sound, which is not conducive to the safety of construction operations and the smooth progress of construction. Utility Model Content

[0004] On the one hand, the present application provides a rock drill impact hydraulic control valve group to solve the technical problems that the existing rock drill impact hydraulic valve group cannot eliminate the damage to the system and components caused by the pressure build-up and there is residual impact pressure after the oil is cut off.

[0005] The technical solutions adopted in this application are as follows:

[0006] A rock drill impact hydraulic control valve group includes a hydraulically controlled reversing valve, a first throttle hole, an electric proportional relief valve, a relief valve, a second throttle hole, a valve body, and an electromagnetic reversing valve, wherein:

[0007] The valve body is provided with a pressure oil port P, an oil return port T, an oil drain port L, an LS oil port, and a working oil port A. The pressure oil port P is connected with the oil inlet of the overflow valve and the oil inlet of the second throttle hole through the hole on the valve body; the oil outlet of the second throttle hole is connected with the oil inlet of the electromagnetic reversing valve; the working oil port of the electromagnetic reversing valve is connected with the control oil port of the hydraulic control reversing valve; the oil return port T is connected with the oil outlet of the overflow valve; the oil drain port L is connected with the oil drain port of the electromagnetic reversing valve, and is also connected with the oil drain port of the hydraulic control reversing valve, the oil outlet and the control oil port of the electric proportional overflow valve; the LS oil port is connected with the oil outlet of the first throttle hole and the oil inlet of the electric proportional overflow valve; the working oil port A is connected with the working oil port of the hydraulic control reversing valve and the oil inlet of the first throttle hole.

[0008] Preferably, the valve body is also provided with a detection oil port MP1 connected to the pressure oil port P, which is convenient for pressure detection and helpful for troubleshooting.

[0009] Preferably, the valve body is also provided with a detection oil port MP2 connected to the working oil port A, which is convenient for pressure detection and helpful for troubleshooting.

[0010] Preferably, the overflow valve is an adjustable overflow valve.

[0011] On the other hand, the present application also provides a rock drill, including the rock drill impact hydraulic control valve group.

[0012] Compared with the prior art, this application has the following beneficial effects:

[0013] 1. This application simplifies the hydraulic system, making the system more integrated, avoiding complex hydraulic pipeline connections, and reducing the probability of system oil leakage and failure;

[0014] 2. This application can avoid component damage caused by the variable pump swash plate stuck and pressure accumulation by limiting the peak pressure of the pressure oil port through the overflow valve, making the construction safer;

[0015] 3. This application solves the problem of pressure remaining after stopping impact due to valve leakage during actual construction by setting an electric proportional relief valve, ensuring safe construction and enabling the rock drill to better adapt to the construction environment.

[0016] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the composition principle of the rock drill impact hydraulic control valve group according to the preferred embodiment of the present application.

[0019] As shown in the figure: 1. hydraulically controlled reversing valve; 2. first throttle hole; 3. electric proportional relief valve; 4. relief valve; 5. second throttle hole; 7. valve body; 6. electromagnetic reversing valve. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Reference Figure 1 The preferred embodiment of the present application provides a rock drill impact hydraulic control valve group, including a hydraulically controlled reversing valve 1, a first throttle hole 2, an electric proportional relief valve 3, a relief valve 4, a second throttle hole 5, a valve body 7, and an electromagnetic reversing valve 6, wherein:

[0022] The valve body 7 is provided with a pressure oil port P, an oil return port T, an oil drain port L, an LS oil port, and a working oil port A. The pressure oil port P is connected with the oil inlet of the relief valve 4 and the oil inlet of the second throttle hole 5 through the hole on the valve body 7; the oil outlet of the second throttle hole 5 is connected with the oil inlet of the electromagnetic reversing valve 6; the working oil port of the electromagnetic reversing valve 6 is connected with the control oil port of the hydraulic control reversing valve 1; the oil return port T is connected with the oil outlet of the relief valve 4; the oil drain port L is connected with the oil drain port of the electromagnetic reversing valve 6, and is also connected with the oil drain port of the hydraulic control reversing valve 1, the oil outlet and the control oil port of the electric proportional relief valve 3; the LS oil port is connected with the oil outlet of the first throttle hole 2 and the oil inlet of the electric proportional relief valve 3; the working oil port A is connected with the working oil port of the hydraulic control reversing valve 1 and the oil inlet of the first throttle hole 2.

[0023] Preferably, the valve body 7 is also provided with a detection oil port MP1 connected to the pressure oil port P, which is convenient for pressure detection and helpful for troubleshooting.

[0024] Preferably, the valve body 7 is also provided with a detection oil port MP2 connected to the working oil port A, which is convenient for pressure detection and helpful for troubleshooting.

[0025] Preferably, the relief valve 4 is an adjustable relief valve, which can flexibly limit the peak pressure of the pressure oil port.

[0026] In the above embodiment, the function of the relief valve 4 is to limit the peak pressure of the oil inlet and protect the system;

[0027] The function of the electromagnetic reversing valve 6 is to realize the loading and unloading of the control oil of the hydraulic control reversing valve 1 by controlling the opening and closing of the oil inlet and the working oil port; the function of the hydraulic control reversing valve 1 is to realize the connection and disconnection of the pressure oil and the working oil port A by reversing, thereby controlling the operation and stop of the impact mechanism; the function of the electric proportional relief valve 3 is to control the Ls pressure, thereby realizing the pump outlet pressure control; at the same time, when the hydraulic control reversing valve 1 is in the initial position, the leakage flow of the hydraulic control reversing valve 1 is discharged; the first throttle hole 2 and the second throttle hole 5 play a throttling role, so that the hydraulic flow matches the set flow of the connected related valve group, which can reduce flow loss and heat, and at the same time ensure the stability of the hydraulic oil flow and pressure in the main flow path during operation.

[0028] The working principle of the above embodiment of the present application is described in detail below:

[0029] 1. Impact operation

[0030] The pressure oil enters from the P port and reaches the oil inlet of the hydraulic control reversing valve 1. At this time, the hydraulic control reversing valve 1 works in the right position due to the spring force, and the pressure oil cannot pass through. At the same time, another oil reaches the oil inlet of the electromagnetic reversing valve 6 through the second throttle hole 5. At this time, the electromagnet is not energized, and the electromagnetic reversing valve 6 works in the right position under the action of the spring force, and the control oil cannot pass through the electromagnetic reversing valve 6. When the impact operation starts, the electromagnetic reversing valve 6 and the electric proportional relief valve 3 are energized at the same time. At this time, the electromagnetic reversing valve 6 works in the left position. The control oil reaches the control oil port of the hydraulic control reversing valve 1 through the oil inlet and the working oil port of the electromagnetic reversing valve 6, and overcomes the spring force at the other end to switch the hydraulic control reversing valve 1 to the left position. At this time, the oil inlet of the hydraulic control reversing valve 1 is connected with the working oil port, and the pressure oil enters the working oil port A of the rock drill; the electric proportional relief valve 3 is energized to control the LS oil port pressure to achieve pump outlet pressure control. When the pressure at the pressure oil port P reaches the set pressure of the relief valve 4, the relief valve 4 opens to overflow the excess oil, limiting the maximum pressure at the pressure oil port P, thereby protecting the system.

[0031] The working principles of heavy impact operation and light impact operation are the same, the difference is that the pressure set by the electric proportional relief valve 3 is different. When the set pressure is higher, the actuator can work under heavy load conditions, and when the set pressure is lower, the actuator can work under light load conditions.

[0032] 2. Stop the operation

[0033] When the rock drill needs to stop the impact operation, the electromagnets of the electromagnetic reversing valve 6 and the electro-proportional relief valve 3 lose power, and the electromagnetic reversing valve 6 switches to the right position. At this time, the oil in the control oil port of the hydraulic control reversing valve 1 flows back to the oil tank through the electromagnetic reversing valve 6 and the oil drain port L. The hydraulic control reversing valve 1 switches to the right position under the action of the spring force. At this time, the passage from the pressure oil port P to the working oil port A is cut off, and the rock drill stops the impact operation.

[0034] In actual use, after the hydraulically controlled reversing valve 1 has been used for a long time, a slight leakage occurs between the valve core and the valve body. After the hydraulically controlled reversing valve 1 is switched to the right position to cut off the passage from the pressure oil port P to the working oil port A, due to the internal leakage of the hydraulically controlled reversing valve 1, pressurized oil will still enter the working oil port A through the hydraulically controlled reversing valve 1. At this time, the electric proportional relief valve 3 connected in parallel to the working oil circuit loses power, the valve port opens, and the oil is leaked, limiting the pressure increase at the working oil port A to prevent adverse effects on normal construction.

[0035] Another preferred embodiment of the present application further provides a rock drill, comprising the rock drill impact hydraulic control valve group.

[0036] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A rock drill impact hydraulic control valve group, characterized in that: The invention comprises a hydraulically controlled reversing valve (1), a first throttle hole (2), an electric proportional relief valve (3), a relief valve (4), a second throttle hole (5), a valve body (7), and an electromagnetic reversing valve (6), wherein: The valve body (7) is provided with a pressure oil port P, an oil return port T, an oil drain port L, an LS oil port, and a working oil port A. The pressure oil port P is connected to the oil inlet of the overflow valve (4) and the oil inlet of the second throttle hole (5) through a hole on the valve body (7); the oil outlet of the second throttle hole (5) is connected to the oil inlet of the electromagnetic reversing valve (6); the working oil port of the electromagnetic reversing valve (6) is connected to the control oil port of the hydraulically controlled reversing valve (1); the oil return port T is connected to the The oil outlet of the overflow valve (4) is connected; the oil drain port L is connected to the oil drain port of the electromagnetic reversing valve (6), and is also connected to the oil drain port of the hydraulically controlled reversing valve (1), the oil outlet of the electric proportional overflow valve (3) and the control oil port; the LS oil port is connected to the oil outlet of the first throttle hole (2) and the oil inlet of the electric proportional overflow valve (3); the working oil port A is connected to the working oil port of the hydraulically controlled reversing valve (1) and the oil inlet of the first throttle hole (2).

2. The rock drill impact hydraulic control valve group according to claim 1, characterized in that: The valve body (7) is also provided with a detection oil port MP1 which is connected to the pressure oil port P.

3. The rock drill impact hydraulic control valve group according to claim 1 or 2, characterized in that: The valve body (7) is also provided with a detection oil port MP2 which is connected to the working oil port A.

4. The rock drill impact hydraulic control valve group according to claim 1, characterized in that: The overflow valve (4) is an adjustable overflow valve.

5. A rock drill, characterized in that: The invention comprises the rock drill impact hydraulic control valve group as claimed in any one of claims 1 to 4.

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