Self-contained integrated electro-hydraulic actuator

Abstract

The utility model relates to a self-contained integrated electro-hydraulic actuator which comprises a rack and an actuating shaft, the actuating shaft is provided with a crank, and the tail end of the crank is provided with a heavy hammer. The driving assembly comprises a driving hydraulic cylinder and a hydraulic control assembly, the driving hydraulic cylinder comprises a cylinder body and a cylinder bottom base, the hydraulic control assembly comprises a valve block, an oil pump, an expansion oil tank, a reversing electromagnetic valve and a one-way valve, a hammer lifting oil way and a hammer falling oil way are arranged in the valve block, and the hammer lifting oil way is connected with the oil pump and the one-way valve in series; the other end of the hammer lifting oil way communicates with a rodless cavity of the driving hydraulic cylinder, one end of the hammer falling oil way communicates with the rodless cavity of the driving hydraulic cylinder, and the other end of the hammer falling oil way communicates with a port B of the reversing electromagnetic valve. The hydraulic control assembly is integrated on the driving hydraulic cylinder, and meanwhile, the heavy hammer is arranged on the execution shaft, so that the whole structure is compact; the compactness is further improved by installing all hydraulic components on the same valve block, and installation and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and in particular to a self-contained integrated electro-hydraulic actuator. Background Technology

[0002] In the current water treatment valve industry, there is a type of safety valve that requires rapid action and can maintain operation and function even in the event of a power outage. These are angle-rotation type valves, such as pump downstream fast-closing and slow-closing protection valves, pipe rupture protection valves, turbine inlet safety valves, and quick-opening steam traps. Their actuators are typically accumulator actuators, usually either counterweight electro-hydraulic actuators or nitrogen accumulator electro-hydraulic actuators. Both types of actuators are generally bulky and have disadvantages such as complex structure, high cost, and difficult maintenance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a self-contained integrated electro-hydraulic actuator.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a self-contained integrated electro-hydraulic actuator, including a frame, an actuator shaft rotatably connected to the frame, and a drive assembly disposed on the frame for driving the actuator shaft to rotate. The actuator shaft is provided with a crank, and a counterweight is provided at the end of the crank. The crank is perpendicular to the axis of the actuator shaft. The drive assembly includes a drive hydraulic cylinder and a hydraulic control assembly connected to the drive hydraulic cylinder. The drive hydraulic cylinder includes a cylinder body connected to the frame and a cylinder bottom base disposed at the tail end of the cylinder body. The hydraulic control assembly includes a valve block, an oil pump, an expansion tank, a reversing solenoid valve, and a check valve. The oil pump, expansion tank, reversing solenoid valve, and check valve are mounted on the valve block. The valve block has an internal oil passage. The reversing solenoid valve is a two-position three-way solenoid valve, including port A, port B, and port C. Port A connects to the expansion tank and the rod-side chamber of the driving hydraulic cylinder. The valve block has a hammer-lifting oil passage and a hammer-dropping oil passage. The hammer-lifting oil passage is connected in series with the oil pump and the check valve. One end of the hammer-lifting oil passage connects to port C of the reversing solenoid valve, and the other end connects to the rodless chamber of the driving hydraulic cylinder. One end of the hammer-dropping oil passage connects to the rodless chamber of the driving hydraulic cylinder, and the other end connects to port B of the reversing solenoid valve.

[0005] As a further improvement to this design, a speed regulating valve is connected in series in the drop hammer oil circuit.

[0006] As a further improvement to this design, a normally open shut-off valve is connected in series in the falling hammer oil circuit, and a normally closed shut-off valve is connected between the A port and the B port of the reversing solenoid valve. A manual pump is provided on the cylinder body of the driving hydraulic cylinder. The two ends of the manual pump are respectively connected to the rodless chamber and the rod chamber of the driving hydraulic cylinder, and the hydraulic oil in the manual pump can only flow from the rod chamber to the rodless chamber.

[0007] As a further improvement to this design, a one-way throttle valve is connected in series between the lifting hammer oil circuit and the falling hammer oil circuit and the rodless chamber of the driving hydraulic cylinder.

[0008] As a further improvement to this design, the A port of the reversing solenoid valve is also connected to a temperature sensor, an oil injection check valve, and an oil-gas release valve. The valve block is provided with interfaces for the temperature sensor, the oil injection check valve, and the oil-gas release valve.

[0009] As a further improvement to this design, a pressure transmitter, a pressure accumulator, and a pressure switch are also connected to the rodless chamber of the driving hydraulic cylinder, and the valve block is provided with a connection port for connecting the pressure transmitter, the pressure accumulator, and the pressure switch.

[0010] As a further improvement to this design, a vacuum switch is connected to the C port of the reversing solenoid valve, and an interface connected to the vacuum switch is provided on the valve block; an overflow valve is connected between the inlet and outlet of the oil pump, and an oil filter is connected in series between the oil pump outlet and the check valve.

[0011] As a further improvement to this design, the cylinder base is provided with a manual port connected to the outlet of the manual pump and an oil inlet connected to the lifting hammer oil circuit. A one-way throttle valve is provided on the cylinder base, with one end of the one-way throttle valve connected to the oil inlet and the other end of the one-way throttle valve connected to the rodless chamber of the driving hydraulic cylinder.

[0012] As a further improvement to this design, an angle sensor is provided on the crank, and a limit switch for detecting the rotation angle of the actuator shaft is provided on the frame.

[0013] The beneficial effects of this utility model are: by integrating hydraulic control components on the drive hydraulic cylinder and setting a counterweight on the actuator shaft, the overall structure is compact; by installing each hydraulic component on the same valve block, the compactness is further improved, and installation and maintenance are convenient. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a three-dimensional structural diagram of the entire utility model from one direction.

[0016] Figure 2This is a three-dimensional structural diagram of the entire utility model from another perspective.

[0017] Figure 3 This is a hydraulic schematic diagram of this utility model.

[0018] In the diagram: 1. Frame; 2. Crank; 3. Angle sensor; 4. Counterweight; 5. Limit switch; 6. Actuator shaft; 7. Manual pump; 8. Drive assembly; 80. Drive hydraulic cylinder; 800. Cylinder body; 801. Cylinder base; 81. Hydraulic control assembly; 810. One-way throttle valve; 811. Speed ​​control valve; 812. Valve block; 813. Reversing solenoid valve; 814. Normally closed shut-off valve; 815. Pressure gauge; 816. Pressure transmitter; 8 17. Normally open shut-off valve; 818. Oil pump; 819. Expansion tank; 8190. Pressure accumulator; 8191. Check valve; 8192. Pressure switch; 8193. Vacuum switch; 8194. Relief valve; 8195. Oil filter; 8196. Temperature sensor; 8197. Oil injection check valve; 8198. Oil-gas mixture release valve; 90. Lifting hammer oil circuit; 91. Falling hammer oil circuit; 10. Port B; 11. Port C; 12. Port A. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Example

[0020] Please see Figure 1 and Figure 2This embodiment provides a self-contained integrated electro-hydraulic actuator, including a frame 1, an actuator shaft 6 rotatably connected to the frame 1, and a drive assembly 8 mounted on the frame 1 for driving the actuator shaft 6 to rotate linearly. The actuator shaft 6 has a crank 2, and a counterweight 4 is located at the end of the crank 2. The crank 2 is perpendicular to the axis of the actuator shaft 6. The drive assembly 8 includes a drive hydraulic cylinder 80 and a hydraulic control assembly 81 connected to the drive hydraulic cylinder 80. The drive hydraulic cylinder 80 includes a cylinder body 800 connected to the frame 1 and a cylinder bottom base 801 located at the tail end of the cylinder body 800. The hydraulic control assembly 81 includes a valve block 812, an oil pump 818, an expansion tank 819, a reversing solenoid valve 813, and a check valve 8191. The oil pump 818, expansion tank 819, and reversing solenoid valve 812... Valve 813 and check valve 8191 are mounted on valve block 812. Valve block 812 has an internal oil passage. The reversing solenoid valve 813 is a two-position three-way solenoid valve, including port A12, port B10, and port C11. Port A12 connects to expansion tank 819 and the rod chamber of driving hydraulic cylinder 80. Valve block 812 has a hammer lifting oil passage 90 and a hammer dropping oil passage 91. The hammer lifting oil passage 90 is connected in series with oil pump 818 and check valve 8191. One end of the hammer lifting oil passage 90 is connected to port C11 of the reversing solenoid valve 813, and the other end is connected to the rodless chamber of driving hydraulic cylinder 80. One end of the hammer dropping oil passage 91 is connected to the rodless chamber of driving hydraulic cylinder 80, and the other end is connected to port B10 of the reversing solenoid valve 813.

[0021] By integrating the hydraulic control component 81 on the drive hydraulic cylinder 80 and setting the counterweight 4 on the actuator shaft 6, the overall structure is compact; the compactness is further improved by mounting each hydraulic component on the same valve block 812, making installation and maintenance convenient.

[0022] Please see Figure 1 In order to adjust the falling hammer speed, a speed regulating valve 811 and a pressure gauge 815 are connected in series on the falling hammer oil circuit 91.

[0023] Please see Figure 3 To prevent hydraulic system failure, a normally open shut-off valve 817 is connected in series on the drop hammer oil circuit 91. A normally closed shut-off valve 814 is connected between port A 12 and port B 10 of the reversing solenoid valve 813. A manual pump 7 is provided on the cylinder body 800 of the driving hydraulic cylinder 80. The two ends of the manual pump 7 are respectively connected to the rodless chamber and the rod chamber of the driving hydraulic cylinder 80, and the hydraulic oil in the manual pump 7 can only flow from the rod chamber to the rodless chamber.

[0024] Please see Figure 3A one-way throttle valve 810 is connected in series between the lifting hammer oil circuit 90 and the falling hammer oil circuit 91 and the rodless chamber of the driving hydraulic cylinder 80.

[0025] Please see Figure 3 The A port 12 of the reversing solenoid valve 813 is also connected to a temperature sensor 8196, an oil injection check valve 8197, and an oil-gas release valve 8198. The valve block 812 is provided with interfaces for the temperature sensor 8196, the oil injection check valve 8197, and the oil-gas release valve 8198.

[0026] Please see Figure 3 In order to facilitate the smooth driving of the hydraulic cylinder 80, the rodless chamber of the hydraulic cylinder 80 is also connected to a pressure transmitter 816, a pressure accumulator 8190, and a pressure switch 8192. The valve block 812 is provided with a connection port for connecting the pressure transmitter 816, the pressure accumulator 8190, and the pressure switch 8192.

[0027] Please see Figure 3 To ensure the smooth operation of the entire hydraulic system, a vacuum switch 8193 is connected to port C11 of the solenoid valve 813, and an interface connected to the vacuum switch 8193 is provided on the valve block 812; an overflow valve 8194 is connected between the inlet and outlet of the oil pump 818, and an oil filter 8195 is connected in series between the outlet of the oil pump 818 and the check valve 8191.

[0028] Please see Figure 3 To facilitate manual operation, the cylinder base 801 is provided with a manual port connected to the outlet of the manual pump 7 and an oil inlet connected to the lifting hammer oil circuit 90. The cylinder base 801 is provided with a one-way throttle valve 810, one end of which is connected to the oil inlet, and the other end of which is connected to the rodless chamber of the driving hydraulic cylinder 80.

[0029] Please see Figure 1 To facilitate automatic control, an angle sensor 3 is provided on the crank 2, and a limit switch 5 is provided on the frame 1 to detect the rotation angle of the actuator shaft 6.

[0030] When the electro-hydraulic hammer is lifted, ports A12 and C11 of the reversing solenoid valve 813 are connected, the oil pump 818 is working, and the hydraulic oil enters the rodless chamber of the driving hydraulic cylinder 80 through the oil filter 8195 and the check valve 8191. The hydraulic rod of the driving hydraulic cylinder 80 extends and drives the crank 2 to rotate, and the hammer 4 is raised to the highest point.

[0031] When manually lifting the hammer, close the normally open shut-off valve 817, open the normally closed shut-off valve 814, drive the manual pump 7, and drive the hydraulic cylinder 80 to extend.

[0032] When the hammer falls, port A12 and port B10 of the reversing solenoid valve 813 are connected, the oil pump 818 stops working, and the weight of the hammer 4 drives the actuator shaft 6 to rotate.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A self-contained integrated electro-hydraulic actuator, comprising a frame, an actuator shaft rotatably connected to the frame, and a drive assembly disposed on the frame for driving the actuator shaft to rotate, characterized in that, The actuator shaft is equipped with a crank, and a counterweight is located at the end of the crank. The crank is perpendicular to the axis of the actuator shaft. The drive assembly includes a drive hydraulic cylinder and a hydraulic control assembly connected to the drive hydraulic cylinder. The drive hydraulic cylinder includes a cylinder body connected to the frame and a cylinder base located at the tail end of the cylinder body. The hydraulic control assembly includes a valve block, an oil pump, an expansion tank, a reversing solenoid valve, and a check valve. The oil pump, expansion tank, reversing solenoid valve, and check valve are mounted on the valve block, and the valve block has an internal oil passage. The reversing solenoid valve is a two-position three-way solenoid valve, which includes port A, port B, and port C. Port A is connected to the expansion tank and the rod chamber of the driving hydraulic cylinder. The valve block is provided with a hammer lifting oil circuit and a hammer dropping oil circuit. An oil pump and a check valve are connected in series on the hammer lifting oil circuit. One end of the hammer lifting oil circuit is connected to port C of the reversing solenoid valve, and the other end of the hammer lifting oil circuit is connected to the rodless chamber of the driving hydraulic cylinder. One end of the hammer dropping oil circuit is connected to the rodless chamber of the driving hydraulic cylinder, and the other end of the hammer dropping oil circuit is connected to port B of the reversing solenoid valve.

2. The self-contained integrated electro-hydraulic actuator according to claim 1, characterized in that, A speed control valve is connected in series in the drop hammer oil circuit.

3. The self-contained integrated electro-hydraulic actuator according to claim 2, characterized in that, A normally open shut-off valve is connected in series in the falling hammer oil circuit. A normally closed shut-off valve is connected between the A port and the B port of the reversing solenoid valve. A manual pump is provided on the cylinder body of the driving hydraulic cylinder. The two ends of the manual pump are respectively connected to the rodless chamber and the rod chamber of the driving hydraulic cylinder, and the hydraulic oil in the manual pump can only flow from the rod chamber to the rodless chamber.

4. A self-contained integrated electro-hydraulic actuator according to claim 3, characterized in that, A one-way throttle valve is connected in series between the lifting hammer oil circuit and the falling hammer oil circuit and the rodless chamber of the driving hydraulic cylinder.

5. A self-contained integrated electro-hydraulic actuator according to claim 4, characterized in that, The A port of the reversing solenoid valve is also connected to a temperature sensor, an oil injection check valve, and an oil-gas release valve. The valve block is provided with interfaces for the temperature sensor, the oil injection check valve, and the oil-gas release valve.

6. A self-contained integrated electro-hydraulic actuator according to claim 5, characterized in that, The rodless chamber of the driving hydraulic cylinder is also connected to a pressure transmitter, a pressure accumulator, and a pressure switch. The valve block is provided with a connection port for connecting the pressure transmitter, the pressure accumulator, and the pressure switch.

7. A self-contained integrated electro-hydraulic actuator according to claim 6, characterized in that, A vacuum switch is connected to port C of the reversing solenoid valve, and an interface connected to the vacuum switch is provided on the valve block; an overflow valve is connected between the inlet and outlet of the oil pump, and an oil filter is connected in series between the oil pump outlet and the check valve.

8. A self-contained integrated electro-hydraulic actuator according to claim 7, characterized in that, The cylinder base is provided with a manual port connected to the outlet of the manual pump and an oil inlet connected to the lifting hammer oil circuit. A one-way throttle valve is provided on the cylinder base. One end of the one-way throttle valve is connected to the oil inlet, and the other end of the one-way throttle valve is connected to the rodless chamber of the driving hydraulic cylinder.

9. A self-contained integrated electro-hydraulic actuator according to claim 1, characterized in that, An angle sensor is provided on the crank, and a limit switch for detecting the rotation angle of the actuator shaft is provided on the frame.

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