Safety valve group for hydraulic servo system

Abstract

The utility model relates to the field of hydraulic servo systems, and discloses a safety valve group for a hydraulic servo system, which comprises a valve block and is characterized in that a servo valve is mounted on the upper surface of the valve block, and a first fully-adjustable throttle valve is mounted on the upper surface of the valve block close to the left end of the servo valve. A second full-adjustment type throttling valve is installed at the position, close to the right end of the servo valve, of the upper surface of the valve block, an electromagnetic direction valve is installed on the upper surface of the valve block, a first balance type normally-open logic valve is installed on the left surface of the valve block, and a first balance type normally-closed logic valve is installed on the left surface of the valve block. And a second balance type normally-closed logic valve is mounted on the right surface of the valve block. According to the utility model, by adopting a new oil way design, the whole device has the advantages of simple structure, small valve body size, safety, reliability and the like, and meanwhile, the whole device can take pressure relief protection measures on a system in time according to working conditions, so that the safety of system equipment and operators is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic servo systems, in particular to a safety valve group for hydraulic servo systems. Background Art

[0002] The hydraulic servo system has the advantages of small size, light weight, high power ratio, high control accuracy, easy to achieve reciprocating motion and wide range of stepless speed change, smooth transmission, long service life and easy operation. It is widely used in many industrial fields such as aerospace, transportation, military industry, mining, and shipbuilding. The hydraulic servo system often works under high pressure, high load or high speed operation state, and its stability and safety are very important.

[0003] In the prior art, once an abnormality occurs in the hydraulic servo system, it often leads to system loss of control, which will cause the actuator to malfunction and cause damage to the operator and the system. Therefore, a safety valve group for a hydraulic servo system is proposed to solve the above problem. Utility Model Content

[0004] In order to make up for the above deficiencies, the utility model provides a safety valve group for a hydraulic servo system, aiming to improve the problem in the prior art that "abnormalities in the hydraulic servo system may cause the system to lose control, which may cause damage to the operator and the system."

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a safety valve group for a hydraulic servo system, including a valve block, characterized in that: a servo valve is installed on the upper surface of the valve block, a first fully adjustable throttle valve is installed on the upper surface of the valve block near the left end of the servo valve, a second fully adjustable throttle valve is installed on the upper surface of the valve block near the right end of the servo valve, an electromagnetic directional valve is installed on the upper surface of the valve block, a first balanced normally open logic valve is installed on the left surface of the valve block, a first balanced normally closed logic valve is installed on the left surface of the valve block, a second balanced normally closed logic valve is installed on the right surface of the valve block, and a second balanced normally open logic valve is installed on the right surface of the valve block, the bottom end of the valve block is provided with oil ports in four groups, and the multiple groups of oil ports are respectively a first oil port, a second oil port, an oil return port, and an oil inlet port, and a plug is installed on the front surface of the valve block.

[0006] As a further description of the above technical solution:

[0007] The A chamber of the servo valve is connected to the first oil port via a first balanced normally closed logic valve, and the front end of the A chamber of the servo valve is connected to the oil inlet.

[0008] As a further description of the above technical solution:

[0009] The B chamber of the servo valve is connected to the second oil port through a second balanced normally closed logic valve, and the front end of the B chamber of the servo valve is connected to the oil return port.

[0010] As a further description of the above technical solution:

[0011] The B chamber of the first balanced normally open logic valve is connected to the first oil port, and the A chamber of the first balanced normally open logic valve is connected to the B chamber of the first fully adjustable throttle valve.

[0012] As a further description of the above technical solution:

[0013] The B chamber of the second balanced normally open logic valve is connected to the second oil port, and the A chamber of the second balanced normally open logic valve is connected to the B chamber of the second fully adjustable throttle valve.

[0014] As a further description of the above technical solution:

[0015] The first balanced normally open logic valve, the first balanced normally closed logic valve, the second balanced normally closed logic valve and the second balanced normally open logic valve can form a complete hydraulic circuit, and the solenoid directional valve is installed on the outer wall of the hydraulic circuit.

[0016] As a further description of the above technical solution:

[0017] An anti-collision rib is fixedly connected to the upper surface of the valve block.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, by adopting a new oil circuit design, the overall device has the advantages of simple structure, small valve body volume, safety and reliability. At the same time, the overall device can take pressure relief protection measures for the system in time according to the working conditions to ensure the safety of system equipment and operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view schematic diagram of the overall device of the present utility model;

[0021] Figure 2 This is a bottom view schematic diagram of the overall device of the present invention;

[0022] Figure 3 This is a schematic diagram of the pipeline connection of the overall device in the present utility model.

[0023] Legend:

[0024] 1. Valve block; 2. Servo valve; 3. Solenoid directional valve; 4. First balanced normally open logic valve; 5. First balanced normally closed logic valve; 6. First fully adjustable throttle valve; 7. Second fully adjustable throttle valve; 8. Second balanced normally closed logic valve; 9. Second balanced normally open logic valve; 10. Plug; 11. Anti-collision rib; 12. First oil port; 13. Second oil port; 14. Oil return port; 15. Oil inlet. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Reference Figure 1 - Figure 3 The utility model provides an embodiment: a safety valve group for a hydraulic servo system, including a valve block 1 for supporting the entire device. The valve block 1 is a rectangular parallelepiped with a hollow interior, which is mainly used to fix and install other components. A servo valve 2 for controlling the entire device is installed on the upper surface of the valve block 1. The servo valve 2 is provided with a signal receiving element, which can receive external signals to control the entire device. A first fully adjustable throttle valve 6 for controlling the reflux flow is installed on the upper surface of the valve block 1 near the left end of the servo valve 2. A second fully adjustable throttle valve 7 is installed on the upper surface of the valve block 1 near the right end of the servo valve 2. An electromagnetic valve for controlling the system pressure relief is installed on the upper surface of the valve block 1. To valve 3, the left surface of the valve block 1 is equipped with a first balanced normally open logic valve 4, the balanced normally open logic valve will be closed when normally energized and will open when abnormal. The left surface of the valve block 1 is equipped with a first balanced normally closed logic valve 5, the right surface of the valve block 1 is equipped with a second balanced normally closed logic valve 8, the normally closed logic valve will open when normally energized and will close when the power is abnormal. The right surface of the valve block 1 is equipped with a second balanced normally open logic valve 9. The bottom end of the valve block 1 is provided with oil ports for supplying oil in and out of the valve block 1, and the number is four groups. The multiple groups of oil ports are respectively a first oil port 12, a second oil port 13, an oil return port 14, and an oil inlet port 15. The front surface of the valve block 1 is equipped with a plug 10.

[0027] Reference Figure 1 - Figure 3The A chamber of the servo valve 2 is interconnected with the first oil port 12 through the first balanced normally closed logic valve 5, and the front end of the A chamber of the servo valve 2 is interconnected with the oil inlet 15. The oil inlet 15 can be controlled by adjusting the servo valve 2. The B chamber of the servo valve 2 is interconnected with the second oil port 13 through the second balanced normally closed logic valve 8, and the front end of the B chamber of the servo valve 2 is connected with the return oil port 14. When the device is powered normally, the first balanced normally closed logic valve 5 and the second balanced normally closed logic valve 8 will be in a normally open state, so that the oil inlet and outlet can be controlled by the servo valve 2.

[0028] Reference Figure 1 - Figure 3 , the first balanced normally open logic valve 4B cavity is interconnected with the first oil port 12, the A cavity of the first balanced normally open logic valve 4 is interconnected with the B cavity of the first fully adjustable throttle valve 6, and the B cavity of the second balanced normally open logic valve 9 is interconnected with the second oil port 13. Under normal power-on conditions, the first balanced normally open logic valve 4 and the second balanced normally open logic valve 9 will be in a closed state, so that the oil flowing inside the first oil port 12 and the second oil port 13 will not enter the first balanced normally open logic valve 4 and the second balanced normally open logic valve 9, and the A cavity of the second balanced normally open logic valve 9 is interconnected with the B cavity of the second fully adjustable throttle valve 7. When the device is working normally, both sets of throttle valves do not work. When the device When an abnormality causes the entire system to perform a pressure relief operation, the throttle valve begins to play a role. By adjusting the size of its own throttle port, it can control the flow of hydraulic oil returning from the servo hydraulic cylinder to the return oil pipeline, which helps to control the pressure relief speed, avoid the impact of too fast pressure relief on the system, or too slow pressure relief to protect the system in time. The first balanced normally open logic valve 4, the first balanced normally closed logic valve 5, the second balanced normally closed logic valve 8, and the second balanced normally open logic valve 9 can form a complete hydraulic circuit. The solenoid directional valve 3 is installed on the outer wall of the hydraulic circuit. The solenoid directional valve 3 can be used to control the flow direction of the hydraulic circuit. The upper surface of the valve block 1 is fixedly connected with an anti-collision rib 11 for protecting the entire device.

[0029] Working principle: When the device is in normal state, the solenoid directional valve 3 is in the open state under normal power-on state. At this time, it controls the first balanced normally closed logic valve 5 and the second balanced normally closed logic valve 8 to be connected, and at the same time controls the first balanced normally open logic valve 4 and the second balanced normally open logic valve 9 to be closed. The high-pressure oil inlet 15 of the servo valve 2 is connected to the oil inlet of the external oil source. After receiving the external control signal, it can adjust the hydraulic oil entering from the external oil source. Its oil outlet A is connected to the A port of the first balanced normally closed logic valve 5, and the oil outlet B is connected to the B port of the second balanced normally closed logic valve 8. Since the first balanced normally closed logic valve 5 and the second balanced normally closed logic valve 8 are in the connected state, the hydraulic oil can flow through them to the A chamber and B chamber of the servo hydraulic cylinder respectively, thereby accurately controlling the movement of the servo hydraulic cylinder. The return oil port 14 of the servo valve 2 is connected to the return oil pipeline of the external oil source. During the operation of the servo valve 2, a part of the hydraulic oil will flow back to the external oil source through the return oil port 14, forming a complete hydraulic circuit to ensure the normal operation of the system.

[0030] When the device is in an abnormal state, the solenoid directional valve 3 is immediately closed. This action causes the first balanced normally closed logic valve 5 and the second balanced normally closed logic valve 8 to close, cutting off the oil circuit connection between the servo valve 2 and the A chamber and B chamber of the servo hydraulic cylinder; at the same time, the first balanced normally open logic valve 4 and the second balanced normally open logic valve 9 are opened. At this time, the hydraulic oil inside the servo valve 2 flows out through the opened first balanced normally open logic valve 4 and the second balanced normally open logic valve 9. The hydraulic oil first passes through the A port of the first balanced normally open logic valve 4 and the second balanced normally open logic valve 9, and flows into the B port of the first fully adjustable throttle valve 6 and the second fully adjustable throttle valve 7 respectively. The first fully adjustable throttle valve 6 and the second fully adjustable throttle valve 7 control the return oil flow by adjusting the size of their own throttle ports, so that the hydraulic oil flows out from its A port at an appropriate speed and finally flows back to the return oil pipeline to achieve system pressure relief. This pressure relief method can effectively prevent the system from being damaged due to excessive pressure and protect the safety of system equipment and operators.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A safety valve group for a hydraulic servo system, comprising a valve block (1), characterized in that: A servo valve (2) is installed on the upper surface of the valve block (1), a first fully adjustable throttle valve (6) is installed on the upper surface of the valve block (1) near the left end of the servo valve (2), a second fully adjustable throttle valve (7) is installed on the upper surface of the valve block (1) near the right end of the servo valve (2), an electromagnetic directional valve (3) is installed on the upper surface of the valve block (1), a first balanced normally open logic valve (4) is installed on the left surface of the valve block (1), a first balanced normally closed logic valve (5) is installed on the left surface of the valve block (1), a second balanced normally closed logic valve (8) is installed on the right surface of the valve block (1), and a second balanced normally open logic valve (9) is installed on the right surface of the valve block (1). The bottom end of the valve block (1) is provided with oil ports in four groups, and the multiple groups of oil ports are respectively a first oil port (12), a second oil port (13), an oil return port (14), and an oil inlet port (15). A plug (10) is installed on the front surface of the valve block (1).

2. A safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: The A chamber of the servo valve (2) is connected to the first oil port (12) via the first balanced normally closed logic valve (5), and the front end of the A chamber of the servo valve (2) is connected to the oil inlet (15).

3. The safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: The B chamber of the servo valve (2) is connected to the second oil port (13) via the second balanced normally closed logic valve (8), and the front end of the B chamber of the servo valve (2) is connected to the oil return port (14).

4. The safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: The B chamber of the first balanced normally open logic valve (4) is connected to the first oil port (12), and the A chamber of the first balanced normally open logic valve (4) is connected to the B chamber of the first fully adjustable throttle valve (6).

5. The safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: The B chamber of the second balanced normally open logic valve (9) is connected to the second oil port (13), and the A chamber of the second balanced normally open logic valve (9) is connected to the B chamber of the second fully adjustable throttle valve (7).

6. The safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: The first balanced normally open logic valve (4), the first balanced normally closed logic valve (5), the second balanced normally closed logic valve (8), and the second balanced normally open logic valve (9) can form a complete hydraulic circuit, and the solenoid directional valve (3) is installed on the outer wall of the hydraulic circuit.

7. The safety valve assembly for a hydraulic servo system according to claim 1, characterized in that: An anti-collision rib (11) is fixedly connected to the upper surface of the valve block (1).

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