Hydraulic system of valve electro-hydraulic actuating mechanism

Abstract

The utility model relates to a hydraulic system of a valve electro-hydraulic actuating mechanism, a motor is used for driving a gear pump to pump hydraulic oil in an oil tank into an energy accumulator, an actuating oil cylinder and the oil tank are arranged on the upper portion of a supporting frame, and the motor, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, the gear pump and a hydraulic loop are arranged on the lower portion of the supporting frame. An energy accumulator is arranged on the side face of the supporting frame, a piston rod of the execution oil cylinder is connected with a valve rod of the valve through a connecting piece, an oil level sensor is arranged on the oil tank cover, and the execution oil cylinder is provided with a valve position sensor. The utility model has the advantages that the energy accumulator is used as a power source and can provide power energy for the actuating mechanism; the opening action electromagnetic valve, the quick-closing electromagnetic valve, the ESD emergency action electromagnetic valve, the motor, the valve position sensor, the oil level sensor, the temperature sensor and the pressure sensor are connected with the PLC, maintenance personnel can check the running state of equipment at any time through the HMI human-computer interaction screen, operation is easy, maintenance is convenient and fast, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a hydraulic system of a valve electro-hydraulic actuator. Background Art

[0002] The tank root valve is a physical isolation device between the oil depot tank body and the connecting pipeline. When a fire or pipeline leakage occurs around the tank area, it can timely isolate the connection between the tank and the outside world. The tank root valve is driven by an actuator, which includes a pneumatic actuator and an electric actuator. Most existing oil depots use actuators on site, which have the following problems:

[0003] 1) Pneumatic actuators require power energy, but there is no oil depot on site with air compressors and cold dryers, so it is impossible to provide power energy for pneumatic actuators;

[0004] 2) The electric actuator does not have the ability to shut off in an emergency when the power is off;

[0005] There is an urgent need to improve the existing executive agencies. Summary of the invention

[0006] The utility model aims to provide a hydraulic system of a valve electro-hydraulic actuator, which can provide power energy for the actuator without providing an air compressor or a cold dryer at the oil depot site. The actuator has the ability to be emergency cutoff in the event of a power outage to meet emergency needs.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A hydraulic system of a valve electro-hydraulic actuator comprises an oil tank, a support frame, a motor, a gear pump, an accumulator, an actuator cylinder, a valve position sensor, an oil level sensor and a hydraulic circuit. The motor is used to drive the gear pump to pump the hydraulic oil in the oil tank into the accumulator. The hydraulic circuit comprises solenoid valve 1, solenoid valve 3 and solenoid valve 2. The upper part of the support frame is provided with an actuator cylinder and an oil tank. The lower part of the support frame is provided with a motor, solenoid valve 1, solenoid valve 2, solenoid valve 3, a gear pump and a hydraulic circuit. The side of the support frame is provided with an accumulator. The piston rod of the actuator cylinder is connected to the valve stem of the valve through a connecting piece. The oil level sensor is provided on the oil tank cover. The actuator cylinder is provided with a valve position sensor. The solenoid valve 1, solenoid valve 3, solenoid valve 2, the valve position sensor and the oil level sensor are connected to a PLC.

[0009] The hydraulic circuit also includes a pressure sensor, a temperature sensor, a balance valve 1, a balance valve 2, a check valve 1 to a check valve 6, an oil return port, an oil inlet, a main oil port of the hydraulic circuit, and an accumulator working oil port. The oil inlet of the solenoid valve 1, the oil inlet of the solenoid valve 2, the oil inlet of the solenoid valve 3, the oil inlet of the check valve 1, the oil inlet of the check valve 3, and the oil inlet of the check valve 5 are respectively connected to the accumulator working oil port of the hydraulic circuit through an oil delivery channel, the oil outlet of the solenoid valve 3 is respectively connected to the control oil port of the check valve 1 and the control oil port of the check valve 2 through the oil delivery channel, the oil outlet of the solenoid valve 1 is respectively connected to the control oil port of the check valve 3 and the control oil port of the check valve 4 through the oil delivery channel, and the oil outlet of the solenoid valve 2 is respectively connected to the control oil port of the check valve 5 and the control oil port of the check valve 6 through the oil delivery channel;

[0010] The oil outlet of the one-way valve 1, the oil inlet of the one-way valve 4, and the oil outlet of the one-way valve 5 are all connected to the oil inlet of the balance valve 1 through the oil delivery channel, and the oil inlet of the one-way valve 2, the oil outlet of the one-way valve 3, and the oil inlet of the one-way valve 6 are all connected to the oil inlet of the balance valve 2 through the oil delivery channel; the oil outlet of the balance valve 1 is connected to the oil return port of the hydraulic circuit through the oil delivery channel, and the oil outlet of the balance valve 2 is connected to the oil inlet of the hydraulic circuit through the oil delivery channel; the oil outlet of the one-way valve 2, the oil outlet of the one-way valve 4, and the oil outlet of the one-way valve 6 are respectively connected to the main oil port of the hydraulic circuit through the oil delivery channel via the corresponding speed regulating relief valve;

[0011] The pressure sensor is arranged at the output end of the gear pump, the temperature sensor is used to detect the ambient temperature, and the pressure sensor and the temperature sensor are connected to the PLC;

[0012] The accumulator is connected to the accumulator working oil port of the hydraulic circuit, the rod chamber of the actuator cylinder is connected to the oil return port of the hydraulic circuit, the rodless chamber of the actuator cylinder is connected to the oil inlet of the hydraulic circuit, and the oil tank is connected to the hydraulic circuit main oil port of the hydraulic circuit.

[0013] It also includes an oil circuit block, which is in the shape of a rectangular block and is arranged at the lower part of the support frame. An oil delivery channel is arranged in the oil circuit block for guiding the hydraulic oil. Solenoid valve 1, solenoid valve 3, solenoid valve 2, a pressure sensor, balancing valve 1, balancing valve 2, check valve 1 to check valve 6, and a speed regulating relief valve are integrated and installed on the oil circuit block. An oil return port, an oil inlet port, a main oil port of the hydraulic circuit, and a working oil port of the accumulator are arranged on the surface of the oil circuit block.

[0014] It also includes a hot melt device, which includes a valve body and a hot melt metal sheet. The valve body includes a valve block, a first mounting plate, a second mounting plate, a mounting plate, a baffle, a limit plate, and a valve core. The first mounting plate and the second mounting plate are arranged in parallel on both sides of the valve block. The bottoms of the first mounting plate and the second mounting plate are fixedly connected to the valve block, and the tops of the first mounting plate and the second mounting plate are fixedly connected to the mounting plate.

[0015] The baffle is slidably connected to the guide rail, the guide rail is fixedly connected to the second mounting vertical plate, one end of the baffle return spring is connected to the baffle, the other end of the baffle return spring is connected to the second mounting vertical plate, the valve core return spring is sleeved on the outside of the valve core, the limit baffle is fixed on the valve core, and the two ends of the valve core return spring abut against the limit baffle and the valve block; the bottom end of the valve core is in the valve block, and the valve block is provided with oil port A and oil port B. After the valve core rises, oil port A is connected to oil port B, oil port A is connected to the rod chamber of the actuator cylinder, and oil port B is connected to the return oil port of the hydraulic circuit;

[0016] The other end of the hot-melt metal sheet is connected to one end of the connecting rod, the other end of the connecting rod is fixedly connected to the mounting plate, one end of the hot-melt metal sheet is connected to the other end of the connecting sheet, one end of the connecting sheet is fixedly connected to one end of the thrust rod, the bottom end of the thrust rod is fixedly connected to the top end of the starting rod, a spring is sleeved on the starting rod, one end of the spring abuts against the bottom end of the thrust rod, the other end of the spring abuts against the mounting plate, the top end of the valve core abuts against the baffle, a through hole is provided on the baffle, and the bottom end of the starting rod extends into the through hole.

[0017] It also includes a switching power supply, the input end of which is connected to a battery, and the switching power supply is used to provide a working power supply.

[0018] The gear pump is a bidirectional gear pump, the accumulator is a piston accumulator, solenoid valve one, solenoid valve three, and solenoid valve two are all pilot solenoid valves, solenoid valve one and solenoid valve two are energized conduction solenoid valves, and solenoid valve three is a de-energized conduction solenoid valve.

[0019] Check valve 1 to check valve 6 are all hydraulically controlled check valves.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. Start and stop the equipment individually through the HMI human-machine interaction screen, which is simple and intuitive to operate;

[0022] 2. As a power source, the accumulator can provide power energy for the actuator;

[0023] 3. The opening solenoid valve, closing solenoid valve, ESD emergency solenoid valve, motor, valve position sensor, oil level sensor, temperature sensor, and pressure sensor are connected to the PLC. Maintenance personnel can check the equipment operation status at any time through the HMI human-machine interactive screen. The operation is simple, maintenance is convenient, and time-saving and labor-saving;

[0024] 4. The CPU module is connected to the corresponding solenoid valve through the relay group to prevent the solenoid valve from short-circuiting and damaging the CPU module;

[0025] 5. If the valve position sensor, oil level sensor, temperature sensor, and pressure sensor exceed the set value, an alarm will be displayed on the HMI human-machine interaction screen;

[0026] 6. The electro-hydraulic actuator is equipped with a manual plunger hydraulic pump to shut off the valve in case of power failure. The operation is simple and easy to implement;

[0027] 7. There are many hydraulic circuit devices and the pipeline connections take up a lot of space. The use of oil circuit blocks can save space under the support frame, facilitate maintenance, and save time and effort in troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the principle of the hydraulic system of the valve electro-hydraulic actuator.

[0029] Figure 2 This is the schematic diagram of the oil block structure Figure 1 .

[0030] Figure 3 This is the schematic diagram of the oil block structure Figure 2 .

[0031] Figure 4 It is the front view of the electro-hydraulic actuator.

[0032] Figure 5 It is a side view of the electro-hydraulic actuator.

[0033] Figure 6 It is the front view of the electro-hydraulic actuator with valve.

[0034] Figure 7 It is a side view of an electro-hydraulic actuator with a valve.

[0035] Figure 8 It is the front view of the hot melt device.

[0036] Fig. 9 It is a side view of the hot melt device.

[0037] Fig.10 It is a schematic diagram of PLC control principle.

[0038] Fig.11 It is a valve control flow chart.

[0039] Fig.12 It is a schematic diagram of the structure of the increased safety explosion-proof box.

[0040] In the figure: 1- oil tank 2- support frame 3- motor 4- hot melt device 5- gear pump 6- accumulator 7- oil circuit block 8- valve position sensor 9- oil level sensor 10- pressure sensor 11- actuator cylinder 12- oil tank cover 13- ESD emergency action solenoid valve 14- closing action solenoid valve 15- opening action solenoid valve 16- valve 17- piston rod 18- connecting piece 19- manual plunger hydraulic pump 20- manual pump reversing valve 21- valve stem 41- connecting metal sheet 1 42- connecting metal sheet 2 43- housing 44- thrust rod 45- compression spring 46- mounting plate 47- valve core 48- valve block 49- oil port A 50- oil port B 51-valve core return spring 52-baffle return spring 53-baffle 54-temperature sensor 55-increased safety explosion-proof box 57-control chamber 58-power chamber 59-valve body 60-middle shaft shoulder of valve core 61-guide rail 62-O-ring 63-installation plate 1 64-installation plate 2 65-middle shaft shoulder of thrust rod 71-closing action hydraulic control check valve 1 72-closing action hydraulic control check valve 2 73-opening action hydraulic control check valve 1 74-opening action hydraulic control check valve 2 75-ESD action hydraulic control check valve 1 76-ESD action hydraulic control check valve 2 77-hydraulic main circuit balance valve 1 78-hydraulic main circuit balance valve 2 79-manual pump circuit balance valve 1 80-manual pump circuit balance valve 2 81-gear pump Overflow valve 82-manual pump overflow valve 91--accumulator isolation stop valve 92-accumulator pressure relief stop valve 93-accumulator overflow valve 94-manual pump check valve 95-opening speed control throttle valve 96-closing speed control throttle valve 97-ESD speed control throttle valve 101-ESD emergency action solenoid valve oil inlet 102-ESD emergency action solenoid valve oil outlet 201-opening action hydraulic control check valve one oil inlet 202-opening action hydraulic control check valve one oil outlet 203-opening action hydraulic control check valve one control oil port 301-hydraulic circuit opening oil port 302 hydraulic circuit closing oil port 303-accumulator working oil port 304-hydraulic circuit main oil port 308-opening action hydraulic control check valve control oil circuit. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0042] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0043] [Example 1]

[0044] Most oil depots do not have air compressors, cold dryers and other equipment, which cannot provide power for pneumatic actuators. Electric actuators do not have the ability to shut down in an emergency when the power is off. Therefore, electro-hydraulic actuators with built-in hydraulic power sources meet the installation conditions and have the ability to shut down in an emergency. They are a better choice for the transformation of oil depot pipelines and tank root valves. Figure 1 ,See Figures 4 to 7A hydraulic system of a valve electro-hydraulic actuator includes an oil tank 1, a support frame 2, a motor 3, a gear pump 5, an accumulator 6, an actuator cylinder 11, a valve position sensor 8, an oil level sensor 9, a pressure sensor 10, a temperature sensor 54, a hydraulic circuit, a hot melt device 4, and a switch power supply. The hydraulic circuit includes an opening action solenoid valve 15, a closing action solenoid valve 14, and an ESD emergency action solenoid valve 13. The pressure sensor 10 is used to detect the filling oil pressure in the accumulator 6. The motor 3 is used to drive the gear pump 5 to push the hydraulic oil in the oil tank 1. The accumulator 6 is driven into the accumulator 6, the input terminal 1 of the switching power supply is connected to the AC power supply AC220V, and the input terminal 2 of the switching power supply is connected to the battery. When a power outage occurs, the battery is used to provide power, and the switching power supply is used to provide working power. The upper part of the support frame 2 is provided with an execution cylinder 11 and an oil tank 1, the lower part of the support frame 2 is provided with a motor 3 and an oil circuit block 7, and the side of the support frame 2 is provided with an accumulator 6. The piston rod 17 of the execution cylinder 11 is connected to the valve stem 21 of the valve 16 through a connecting piece 18, and an oil level is provided on the oil tank cover 12. Sensor 9, oil level sensor 9 is used to detect the oil level of the oil tank 1, and the actuator cylinder 11 is provided with a valve position sensor 8 for detecting the valve position; the opening action solenoid valve 15 is used to drive the valve opening oil circuit, and the valve opening oil circuit is connected, so that the hydraulic oil in the accumulator 6 pushes the piston rod 17 of the actuator cylinder 11 to move through the valve opening oil circuit, and the valve 16 is opened; the closing action solenoid valve 14 is used to drive the fast closing oil circuit, and the fast closing oil circuit is connected, so that the hydraulic oil in the accumulator 6 pushes the piston rod 17 of the actuator cylinder 11 to move through the fast closing oil circuit, and the valve 16 is closed: The ESD emergency action solenoid valve 13 is used to drive the slow closing oil circuit. The slow closing oil circuit is connected, so that the hydraulic oil in the accumulator 6 pushes the piston rod 17 of the actuator cylinder 11 to move through the slow closing oil circuit, and the valve 16 is closed; the gear pump 5 is a bidirectional gear pump 5, and the opening action solenoid valve 15, the ESD emergency action solenoid valve 13, and the closing action solenoid valve 14 are all pilot solenoid valves, the opening action solenoid valve 15 and the closing action solenoid valve 14 are energized and connected, and the ESD emergency action solenoid valve 13 is de-energized and connected; the accumulator 6 is a piston accumulator 6.Working process of accumulator: Working principle of piston accumulator 6: It works on the principle of accumulating liquid by using the compressibility of gas (nitrogen). Piston accumulator 6 is composed of oil part and gas part with piston as gas sealing isolator. The gas cavity is pre-filled with nitrogen. The oil part is connected with the hydraulic circuit. Therefore, when the pressure rises, accumulator 6 absorbs liquid and gas is compressed. When the pressure drops, the compressed gas expands and pressurizes the accumulated pressure oil into the hydraulic circuit. Accumulator 6 is used as an emergency power source. In the case of sudden loss of external power, accumulator 6 can provide enough energy to complete the actuator and restore valve 16 to a safe position; Accumulator pressure replenishment process: Motor 3 The manual plunger hydraulic pump 19 is driven to pump oil, and the hydraulic oil enters the accumulator 6 to store energy through the gear pump one-way valve 53 and the accumulator isolation stop valve 91. When the hydraulic oil pressure in the accumulator 6 is lower than the lower pressure limit setting value detected by the pressure sensor 10, the motor 3 works, and when the hydraulic oil pressure in the accumulator 6 is higher than the upper pressure limit setting value detected by the pressure sensor 10, the motor 3 stops working; the gear pump one-way valve 53 is used to prevent the accumulator 6 from releasing the hydraulic oil through the manual plunger hydraulic pump 19 to return to the hydraulic oil tank 1, and the overflow valve 93 is used to prevent the manual plunger hydraulic pump 19 from having too high a pressure. When it is higher than the set pressure value of the overflow valve 93, the hydraulic oil pumped out by the manual plunger hydraulic pump 19 returns to the hydraulic oil tank 1 through the overflow valve 93.

[0045] See Figure 1The hydraulic circuit includes an opening solenoid valve 15, an ESD emergency solenoid valve 13, a closing solenoid valve 14, a pressure sensor 10, a temperature sensor 54, a balancing valve, a hydraulically controlled one-way valve, an oil return port, an oil inlet, a hydraulic circuit main oil port 304, an accumulator working oil port 303, and a gear pump overflow valve 81. The gear pump overflow valve 81 is connected in parallel with the gear pump through an oil pipeline. The balancing valve includes a hydraulic main circuit balancing valve 1 77 and a hydraulic main circuit balancing valve 2 78. The hydraulically controlled one-way valve is used to ensure that when the corresponding solenoid valve is not working, the hydraulic oil of the accumulator 6 cannot enter the hydraulic cylinder. The hydraulically controlled one-way valve includes a closing hydraulically controlled one-way valve 1 71, a closing hydraulically controlled one-way valve 2 72, an opening hydraulically controlled one-way valve 1 73, an opening hydraulically controlled one-way valve 2 74, an ESD hydraulically controlled one-way valve 1 75, and an ESD hydraulically controlled one-way valve 2 76. The oil inlet of the opening solenoid valve 15 , the oil inlet of the closing action solenoid valve 14, the oil inlet of the ESD emergency action solenoid valve 13, the oil inlet of the ESD action hydraulically controlled check valve 175, the oil inlet of the opening action hydraulically controlled check valve 173, and the oil inlet of the closing action hydraulically controlled check valve 171 are respectively connected to the accumulator working oil port 303 of the hydraulic circuit through an oil pipeline, the oil outlet of the ESD emergency action solenoid valve 13 is respectively connected to the control oil port of the ESD action hydraulically controlled check valve 175 and the control oil port of the ESD action hydraulically controlled check valve 2 76 through an oil pipeline, the oil outlet of the opening action solenoid valve 15 is respectively connected to the control oil port of the opening action hydraulically controlled check valve 173 and the control oil port of the opening action hydraulically controlled check valve 2 74 through an oil pipeline, and the oil outlet of the closing action solenoid valve 14 is respectively connected to the control oil port of the closing action hydraulically controlled check valve 171 and the control oil port of the closing action hydraulically controlled check valve 2 72 through an oil pipeline.

[0046] The oil outlet of the ESD-acting hydraulically-controlled non-return valve 1 75, the oil inlet of the opening-acting hydraulically-controlled non-return valve 2 74, and the oil outlet of the closing-acting hydraulically-controlled non-return valve 1 71 are all connected to the oil inlet of the hydraulic main circuit balance valve 1 77 through an oil pipeline. The oil inlet of the ESD-acting hydraulically-controlled non-return valve 2 76, the oil outlet of the opening-acting hydraulically-controlled non-return valve 1 73, and the oil inlet of the closing-acting hydraulically-controlled non-return valve 2 72 are all connected to the oil inlet of the hydraulic main circuit balance valve 2 78 through an oil pipeline. The oil outlet of the hydraulic main circuit balance valve 1 77 is connected to the hydraulic circuit opening oil port 301 through an oil pipeline, and the oil outlet of the hydraulic main circuit balance valve 2 78 is connected to the hydraulic circuit closing oil port 302 through an oil pipeline. The oil outlet of the ESD-acting hydraulically-controlled non-return valve 2 76 and the ESD speed regulating throttle valve 97 are connected to the hydraulic circuit. The main oil port 304 is connected through an oil pipeline, the oil outlet of the opening hydraulically controlled one-way valve 2 74 and the opening speed regulating throttle valve 95 are connected to the main oil port 304 of the hydraulic circuit through an oil pipeline, and the oil outlet of the closing hydraulically controlled one-way valve 2 72 and the closing speed regulating throttle valve 96 are connected to the main oil port 304 of the hydraulic circuit through an oil pipeline; the pressure sensor 10 is arranged at the input end of the accumulator 6, the temperature sensor 54 is used to detect the ambient temperature, and the pressure sensor 10 and the temperature sensor 54 are connected to the PLC; the accumulator 6 is connected to the accumulator working oil port 303 of the hydraulic circuit, the rod chamber of the executing cylinder 11 is connected to the opening oil port 301 of the hydraulic circuit, the rodless chamber of the executing cylinder 11 is connected to the closing oil port 302 of the hydraulic circuit, and the oil tank 1 is connected to the hydraulic circuit main oil port 304 of the hydraulic circuit.

[0047] See Figure 1The hand pump oil circuit includes a manual plunger hydraulic pump 19, a manual reversing valve 20, a manual pump overflow valve 82, a manual pump one-way valve 94, a manual pump circuit balancing valve 1 79, and a manual pump circuit balancing valve 2 80. One end of the manual plunger hydraulic pump 19 is connected to the hydraulic circuit main oil port 304 of the hydraulic circuit through an oil pipeline, the other end of the manual plunger hydraulic pump 19 is connected to the working oil port 1 of the manual reversing valve 20 through the manual pump one-way valve 94 through the oil pipeline, the working oil port 2 of the manual reversing valve 20 is connected to the hydraulic circuit main oil port 304 of the hydraulic circuit through the oil pipeline, the working oil port 3 of the manual reversing valve 20 is connected to the oil inlet of the manual pump circuit balancing valve 1 79 through the oil pipeline, and the oil outlet of the manual pump circuit balancing valve 1 79 is connected to the hydraulic circuit The opening oil port 301 is connected through an oil pipeline, the working oil port four of the manual reversing valve 20 is connected to the oil inlet of the manual pump circuit balancing valve 2 80 through an oil pipeline, the oil outlet of the manual pump circuit balancing valve 2 80 is connected to the hydraulic circuit closing oil port 302 through an oil pipeline, the manual pump circuit balancing valve is used to keep the oil pressure in the hydraulic cylinder from being depressurized, and the manual pump overflow valve 82 is connected in parallel with the manual plunger hydraulic pump 19; the manual reversing valve 20 is used to change the flow direction of the oil pumped out by the manual plunger hydraulic pump 19 to open or close the valve; the manual pump circuit balancing valve 1 79 and the manual pump circuit balancing valve 2 80 are used to keep the oil pressure in the actuator cylinder 11 from being depressurized; the manual pump check valve 94 is used to prevent the hydraulic oil from returning to the hydraulic oil tank 1 through the manual plunger hydraulic pump 19.

[0048] See Figure 2 and Figure 3 The lower part of the support frame 2 is provided with an oil circuit block 7, and an oil delivery channel is provided in the oil circuit block 7 to guide the hydraulic oil. The oil circuit block 7 is integrated with an opening action solenoid valve 15, an ESD emergency action solenoid valve 13, a closing action solenoid valve 14, a pressure sensor 10, a manual plunger hydraulic pump 19, a manual pump reversing valve 20, a manual pump overflow valve 82, a manual pump check valve 94, a manual pump circuit balancing valve 79, a manual pump circuit balancing valve 2 80, a gear pump overflow valve 81, a manual pump overflow valve 82, a closing speed regulating throttle valve 96, an ESD speed regulating throttle valve 97, an opening speed regulating throttle valve 95, a manual Pump check valve 94, ESD action hydraulic control check valve 1 75, ESD action hydraulic control check valve 2 76, closing action hydraulic control check valve 1 71, closing action hydraulic control check valve 2 72, hydraulic main circuit balance valve 1 77, opening action hydraulic control check valve 1 73. The surface of the oil circuit block 7 is provided with an oil return port, an oil inlet port, a hydraulic circuit main oil port, and an accumulator working oil port. The movement of the hydraulic oil in the oil circuit block 7 is controlled by the solenoid valve and the manual reversing valve 20. There are many hydraulic circuit equipments, and the pipeline connection occupies a large space. The use of the oil circuit block 7 can save the space at the bottom of the support frame. When the equipment fails, it is convenient for maintenance and troubleshooting saves time and effort.

[0049] Working process:

[0050] The electro-hydraulic actuator drives valve 16 to open: PLC receives the valve opening command, the opening relay drives the opening solenoid valve 15 to be energized, and the valve opening oil circuit is connected. The hydraulic oil in the accumulator 6 drives the opening hydraulic control one-way valve 1 73 and the opening hydraulic control one-way valve 2 74 to open through the opening solenoid valve 15. The hydraulic oil in the accumulator 6 enters the rodless chamber of the actuator cylinder 11 through the opening hydraulic control one-way valve 1 73 and the hydraulic main circuit balancing valve 2 78, pushing the piston rod 17 of the actuator cylinder 11 to move, so that the valve 16 is opened. At the same time, the hydraulic oil in the rod chamber of the actuator cylinder 11, under the action of the piston, passes through the hydraulic main circuit balancing valve 1 77 and the opening hydraulic control one-way valve 2 78. Valve 2 74 and closing speed regulating throttle valve 95 return to oil tank 1; electro-hydraulic actuator drives valve 16 to close: PLC receives valve closing command, valve 16 is a two-stage action, first quickly closes to a certain valve position, and then slowly closes; fast closing: the fast closing relay drives the closing action solenoid valve 14 to be energized, the ESD emergency action solenoid valve 13 loses power, the fast closing oil circuit and the slow closing oil circuit are both connected, fast closing oil circuit: the hydraulic oil in the accumulator 6 drives the closing action hydraulic control check valve 1 71 and the closing action hydraulic control check valve 2 72 to open through the closing action solenoid valve 14, the hydraulic oil in the accumulator 6 enters the rodless chamber of the actuator cylinder 11 through the closing action hydraulic control check valve 1 71 and the hydraulic main circuit balance valve 1 77, and pushes The piston rod 17 of the actuator cylinder 11 moves, so that the valve 16 is closed. At the same time, the hydraulic oil in the rod chamber of the actuator cylinder 11 returns to the oil tank 1 through the hydraulic main circuit balance valve 2 78, the closing action hydraulic control one-way valve 2 72, and the closing speed regulating throttle valve 96 under the action of the piston; slow closing: the ESD emergency action solenoid valve 13 loses power, the closing action solenoid valve 14 loses power, the fast closing oil circuit is closed, and the slow closing oil circuit is connected. Slow closing oil circuit: the hydraulic oil in the accumulator 6 drives the ESD action hydraulic control one-way valve 1 75 and the ESD action hydraulic control one-way valve 2 76 to open through the ESD emergency action solenoid valve 13, and the hydraulic oil in the accumulator 6 ESD action hydraulic control one-way valve 1 75 and the hydraulic main circuit balance valve A 77 enters the rodless chamber of the actuator cylinder 11, pushing the piston rod 17 of the actuator cylinder 11 to move, so that the valve 16 is closed. At the same time, the hydraulic oil in the rod chamber of the actuator cylinder 11 is returned to the oil tank 1 through the hydraulic main circuit balance valve 2 78, the ESD action hydraulic control one-way valve 2 76, and the ESD speed control throttle valve 97 under the action of the piston; the emergency cut-off signal provided by the upstream equipment controls the conduction and closure of the slow closing oil circuit: when there is no fault in the upstream equipment and the emergency cut-off signal is closed, the slow closing relay drives the ESD emergency action solenoid valve 13 to connect or close the slow closing oil circuit; when the upstream equipment fails and the ESD signal is disconnected, the ESD emergency action solenoid valve 13 loses power, making the slow closing oil circuit conductive.

[0051] Working process of the pressure-operated manual plunger hydraulic pump:

[0052] Pressing the manual plunger hydraulic pump drives the valve 16 to open / close through the manual pump oil circuit; manually operating the valve to open: put the manual reversing valve 20 in the open direction (the manual reversing valve 20 is in the right position and is turned on), press the manual plunger hydraulic pump 19, and the hydraulic oil enters the rodless chamber of the actuator cylinder 11 through the manual pump one-way valve 94, the manual reversing valve 20, and the manual pump circuit balancing valve 2 80, pushing the piston rod 17 of the actuator cylinder 11 to move and drive the valve 16 to open; at the same time, the hydraulic oil in the rod chamber of the actuator cylinder 11, under the action of the piston, successively passes through the manual pump circuit balancing valve 1 79 and the manual reversing valve 20 to return to the hydraulic oil tank 1; manually operating the valve to close: put the manual reversing valve 20 in the Closed (manual reversing valve 20 is in the left position and is open), pressing the manual plunger hydraulic pump 19, and the hydraulic oil enters the rod chamber of the actuator cylinder 11 through the manual pump one-way valve 94, the manual reversing valve 20, and the manual pump circuit balancing valve 1 79, pushing the piston rod 17 of the actuator cylinder 11 to move and drive the valve 16 to close; at the same time, the hydraulic oil in the rod chamber of the actuator cylinder 11, under the action of the piston, passes through the manual pump circuit balancing valve 2 80 and the manual reversing valve 20 and returns to the hydraulic oil tank 1; when the pressure of the manual plunger hydraulic pump 19 is higher than the set pressure value of the manual pump overflow valve 82, the hydraulic oil pumped out by the manual plunger hydraulic pump 19 returns to the hydraulic oil tank 1 through the manual pump overflow valve 82.

[0053] [Example 2]

[0054] In this embodiment, a hydraulic system of a valve electro-hydraulic actuator is the same as that of embodiment 1, and a hot melt device 4 is added on the basis of embodiment 1. Figure 8 ,See Fig. 9 The hot melt device 4 includes a valve body 59 and a hot melt metal sheet 42. The valve body 59 includes a valve block 48, a mounting plate 1, a mounting plate 2, a mounting plate 46, a baffle, a limit plate 60, and a valve core 47. The mounting plate 1 63 and the mounting plate 2 64 are arranged in parallel on both sides of the valve block 48. The bottoms of the mounting plates 1 63 and 64 are fixedly connected to the valve block 48, and the tops of the mounting plates 1 63 and 64 are fixedly connected to the mounting plate 46; the baffle is slidably connected to the guide rail 61, and the guide rail 61 is fixedly connected to the mounting plate 462. One end of the baffle return spring 52 is connected to the baffle, and the other end of the baffle return spring 52 is connected to the baffle. The second end is connected with the mounting plate 46, the guide rail 61 is composed of two straight plates arranged parallel to each other, the baffle is arranged between the two straight plates, and the baffle can slide along the straight plates, the valve core return spring 51 is sleeved on the outside of the valve core 47, the limit baffle is fixed on the valve core 47, and the two ends of the valve core return spring 51 are against the limit baffle and the valve block 48; the bottom end of the valve core 47 is in the valve block 48, and the valve block 48 is provided with an oil port A49 and an oil port B50. After the valve core 47 rises, the oil port A49 is connected with the oil port B50, the oil port A49 is connected with the rod chamber of the actuator cylinder 11, and the oil port B50 is connected with the hydraulic circuit opening oil port 301;

[0055] The other end of the hot-melt metal sheet 42 is connected to one end of the connecting rod 43, the other end of the connecting rod 43 is fixedly connected to the mounting plate 46, one end of the hot-melt metal sheet 42 is connected to the other end of the hot-melt metal sheet 41, one end of the hot-melt metal sheet 41 is fixedly connected to one end of the thrust rod 44, the bottom end of the thrust rod 44 is fixedly connected to the top end of the starting rod 62, a spring is sleeved on the starting rod 62, one end of the spring rests on the bottom end of the thrust rod 44, the other end of the spring rests on the mounting plate 46, the top end of the valve core 47 rests on the baffle, a through hole is provided on the baffle, and the bottom end of the starting rod 62 extends into the through hole.

[0056] Working process:

[0057] When the temperature of the hot melt device 4 reaches the set temperature, the hot melt metal sheet 42 of the hot melt device 4 is heated, the hot melt metal melts, and the thrust rod 44 moves upward through the action of the spring, and the starting rod 62 disengages from the through hole. Under the action of the return spring, the baffle moves horizontally until the valve core 47 can move upward under the action of the valve core return spring 51, so that the oil port A49 and the oil port B50 are connected, and the rodless chamber of the execution cylinder 11 is filled with oil, and the piston rod 17 of the execution cylinder 11 pushes the valve stem 21 to close the valve 16; a temperature sensor 54 is set on site to detect the on-site ambient temperature. When the set temperature is reached, the PLC sends a command, which can precede the hot melt device 4 to make the closing action solenoid The valve is turned on, and the accumulator 6 is released to close the valve 16; the melting temperature of the hot melt metal of the hot melt device 4 is 70°C, and the temperature sensor 54 can measure the ambient temperature in real time. The warning temperature of the temperature sensor 54 is set lower than the melting temperature of the hot melt device 4. The warning temperature of the temperature sensor 54 is 50°C. When the ambient temperature is greater than or equal to 50°C, the PLC issues an environmental high temperature warning. It takes time for the hot melt metal to melt. The temperature sensor 54 can immediately issue a warning when it reaches the warning temperature. However, there is a risk of failure of the temperature sensor 54. When the temperature sensor 54 is damaged, the hot melt metal can melt in a high temperature environment, thereby opening the oil circuit to close the valve 16.

[0058] [Example 3]

[0059] In this embodiment, a hydraulic system of a valve electro-hydraulic actuator is the same as that of embodiment 1, and a PLC system is added on the basis of embodiment 1. Fig.10 ,See Fig.12 The PLC is arranged in a control chamber 57 of the increased safety explosion-proof box 55 , and the switch power supply, the forward and reverse control module of the motor 3 , and the battery are arranged in a power chamber 58 of the increased safety explosion-proof box 55 .

[0060] Working principle of ESD relay: The slow closing oil circuit is opened by actuating the slow closing command button of the HMI human-machine interaction screen, and the slow closing oil circuit can also be opened by actuating the emergency cut-off button of the HMI human-machine interaction screen.

[0061] The utility model uses the HMI human-machine interaction screen to start and stop the device, which is simple and intuitive to operate. The accumulator serves as a power source and can provide power energy for the actuator. The opening action solenoid valve, the fast closing solenoid valve, the ESD emergency action solenoid valve, the motor, the valve position sensor, the oil level sensor, the temperature sensor, and the pressure sensor are connected to the PLC, and the maintenance personnel can check the equipment operation status at any time through the HMI human-machine interaction screen. The operation is simple, the maintenance is convenient, and it saves time and effort. The CPU module is connected to the corresponding solenoid valve through a relay group to prevent the solenoid valve from short-circuiting and damaging the CPU module. If the valve position sensor, the oil level sensor, the temperature sensor, and the pressure sensor exceed the set value, there will be an alarm prompt on the HMI human-machine interaction screen; the electro-hydraulic actuator is provided with a manual plunger hydraulic pump to shut off the valve in the event of a power outage, which is simple to operate and easy to implement. There are many hydraulic circuit devices, and the pipeline connection occupies a large space. The use of an oil circuit block can save space at the lower part of the support frame, facilitate maintenance, and save time and effort in troubleshooting.

Claims

1. A hydraulic system of a valve electro-hydraulic actuator, characterized in that: It includes an oil tank, a support frame, a motor, a gear pump, an accumulator, an actuator cylinder, a valve position sensor, an oil level sensor, and a hydraulic circuit. The motor is used to drive the gear pump to pump the hydraulic oil in the oil tank into the accumulator. The hydraulic circuit includes solenoid valve 1, solenoid valve 3, and solenoid valve 2. The upper part of the support frame is provided with an actuator cylinder and an oil tank. The lower part of the support frame is provided with a motor, solenoid valve 1, solenoid valve 2, solenoid valve 3, a gear pump, and a hydraulic circuit. The side of the support frame is provided with an accumulator. The piston rod of the actuator cylinder is connected to the valve stem of the valve through a connecting piece. The oil level sensor is provided on the oil tank cover, and the actuator cylinder is provided with a valve position sensor. Solenoid valve 1, solenoid valve 3, solenoid valve 2, the valve position sensor, and the oil level sensor are connected to the PLC.

2. The hydraulic system of a valve electro-hydraulic actuator according to claim 1, characterized in that: The hydraulic circuit also includes a pressure sensor, a temperature sensor, a balancing valve 1, a balancing valve 2, a check valve 1 to a check valve 6, an oil return port, an oil inlet, an accumulator pressure relief port, and an accumulator pressure replenishing port. The oil inlet of the solenoid valve 1, the oil inlet of the solenoid valve 2, the oil inlet of the solenoid valve 3, the oil inlet of the check valve 1, the oil inlet of the check valve 3, and the oil inlet of the check valve 5 are respectively connected to the accumulator pressure replenishing port of the hydraulic circuit through an oil delivery channel, the oil outlet of the solenoid valve 3 is respectively connected to the control oil port of the check valve 1 and the control oil port of the check valve 2 through the oil delivery channel, the oil outlet of the solenoid valve 1 is respectively connected to the control oil port of the check valve 3 and the control oil port of the check valve 4 through the oil delivery channel, and the oil outlet of the solenoid valve 2 is respectively connected to the control oil port of the check valve 5 and the control oil port of the check valve 6 through the oil delivery channel; The oil outlet of the one-way valve 1, the oil inlet of the one-way valve 4, and the oil outlet of the one-way valve 5 are all connected to the oil inlet of the balance valve 1 through the oil delivery channel, and the oil inlet of the one-way valve 2, the oil outlet of the one-way valve 3, and the oil inlet of the one-way valve 6 are all connected to the oil inlet of the balance valve 2 through the oil delivery channel; the oil outlet of the balance valve 1 is connected to the oil return port of the hydraulic circuit through the oil delivery channel, and the oil outlet of the balance valve 2 is connected to the oil inlet of the hydraulic circuit through the oil delivery channel; the oil outlet of the one-way valve 2, the oil outlet of the one-way valve 4, and the oil outlet of the one-way valve 6 are respectively connected to the pressure relief oil port of the accumulator through the corresponding speed regulating relief valve through the oil delivery channel; The pressure sensor is arranged at the output end of the gear pump, the temperature sensor is used to detect the ambient temperature, and the pressure sensor and the temperature sensor are connected to the PLC; The accumulator is connected to the accumulator pressure replenishing oil port of the hydraulic circuit, the rod chamber of the actuator cylinder is connected to the oil return port of the hydraulic circuit, the rodless chamber of the actuator cylinder is connected to the oil inlet of the hydraulic circuit, and the oil tank is connected to the accumulator pressure relief oil port of the hydraulic circuit.

3. The hydraulic system of a valve electro-hydraulic actuator according to claim 1, characterized in that: It also includes an oil circuit block, which is in the shape of a rectangular block and is arranged at the lower part of the support frame. An oil delivery channel is arranged in the oil circuit block for guiding the hydraulic oil. Solenoid valve 1, solenoid valve 3, solenoid valve 2, a pressure sensor, balancing valve 1, balancing valve 2, check valve 1 to check valve 6, and a speed regulating relief valve are integrated and installed on the oil circuit block. An oil return port, an oil inlet port, an accumulator pressure relief port, and an accumulator pressure replenishing port are arranged on the surface of the oil circuit block.

4. The hydraulic system of a valve electro-hydraulic actuator according to claim 1, characterized in that: It also includes a hot melt device, which includes a valve body and a hot melt metal sheet. The valve body includes a valve block, a first mounting plate, a second mounting plate, a mounting plate, a baffle, a limit plate, and a valve core. The first mounting plate and the second mounting plate are arranged in parallel on both sides of the valve block. The bottoms of the first mounting plate and the second mounting plate are fixedly connected to the valve block, and the tops of the first mounting plate and the second mounting plate are fixedly connected to the mounting plate. The baffle is slidably connected to the guide rail, the guide rail is fixedly connected to the second mounting vertical plate, one end of the baffle return spring is connected to the baffle, the other end of the baffle return spring is connected to the second mounting vertical plate, the valve core return spring is sleeved on the outside of the valve core, the limit baffle is fixed on the valve core, and the two ends of the valve core return spring abut against the limit baffle and the valve block; the bottom end of the valve core is in the valve block, and the valve block is provided with oil port A and oil port B. After the valve core rises, oil port A is connected to oil port B, oil port A is connected to the rod chamber of the actuator cylinder, and oil port B is connected to the return oil port of the hydraulic circuit; The other end of the hot-melt metal sheet is connected to one end of the connecting rod, the other end of the connecting rod is fixedly connected to the mounting plate, one end of the hot-melt metal sheet is connected to the other end of the connecting sheet, one end of the connecting sheet is fixedly connected to one end of the thrust rod, the bottom end of the thrust rod is fixedly connected to the top end of the starting rod, a spring is sleeved on the starting rod, one end of the spring abuts against the bottom end of the thrust rod, the other end of the spring abuts against the mounting plate, the top end of the valve core abuts against the baffle, a through hole is provided on the baffle, and the bottom end of the starting rod extends into the through hole.

5. The hydraulic system of a valve electro-hydraulic actuator according to claim 1, characterized in that: It also includes a switching power supply, the input end of which is connected to a battery, and the switching power supply is used to provide a working power supply.

6. The hydraulic system of a valve electro-hydraulic actuator according to claim 1, characterized in that: The gear pump is a bidirectional gear pump, the accumulator is a piston accumulator, solenoid valve one, solenoid valve three and solenoid valve two are all pilot solenoid valves, solenoid valve one and solenoid valve two are energized conduction solenoid valves, and solenoid valve three is a de-energized conduction solenoid valve.

7. The hydraulic system of a valve electro-hydraulic actuator according to claim 2, characterized in that: The one-way valve 1 to one-way valve 6 are all hydraulically controlled one-way valves.

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