Maintenance device for electric actuating mechanism

Abstract

The invention relates to a maintenance device for an electric actuating mechanism. The power supply commutation module is used for controlling the phase line connection relation between the electric actuating mechanism and the power supply according to the commutation and power supply control instruction; the measuring module is used for measuring current change data and voltage change data when the electric actuating mechanism executes the set action process; the feedback module is electrically connected with the electric actuating mechanism so as to output a feedback signal capable of feeding back the real-time state of the electric actuating mechanism; and the processing module is used for inputting a mode setting instruction and an action control instruction capable of setting the working mode of the electric actuating mechanism to the electric actuating mechanism, outputting a commutation and power supply control instruction to control the electric actuating mechanism to execute a set action flow, and generating a diagnosis report according to the current change data, the voltage change data and the feedback signal. The performance of the electric actuating mechanism can be overhauled during the overhaul power failure period of the nuclear power plant, and the overhaul efficiency of the electric actuating mechanism is improved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant equipment maintenance, and in particular to an electric actuator maintenance device. Background Art

[0002] The maintenance of electric actuators (also called electric heads) needs to be completed when there is power supply. Therefore, during the overhaul of nuclear power plant units, the nuclear island power supply system needs to be shut down for maintenance, resulting in no power supply to downstream power-consuming equipment, making it impossible to repair the electric heads during the power outage. The electric heads can only be repaired after the power is restored, thus affecting the overhaul period. Moreover, during the maintenance process, the staff needs to operate the relevant systems to control the electric heads to perform corresponding actions (including opening and closing valves, etc.), which is cumbersome to operate. Moreover, after the power supply is restored, the operation of each system involves the safety of the nuclear power plant. Therefore, the relevant safety manual must be followed during operation, which increases the difficulty of maintenance and further affects the overhaul period. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an electric actuator maintenance device.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct an electric actuator maintenance device, comprising:

[0005] Power supply;

[0006] A power commutation module, whose input end is electrically connected to the power supply, and whose output end can be electrically connected to the electric actuator, and is used to control the phase line connection relationship between the electric actuator and the power supply according to the commutation and power supply control instructions;

[0007] A measuring module, connected to the power commutation module, for measuring current change data and voltage change data when the electric actuator executes a set action process;

[0008] A feedback module, used for electrically connecting to the electric actuator to output a feedback signal capable of feeding back a real-time state of the electric actuator; and

[0009] A processing module is electrically connected to the power commutation module, the measurement module and the feedback module, and is used to input mode setting instructions and action control instructions that can set the working mode of the electric actuator, and output the commutation and power supply control instructions to control the electric actuator to execute the set action process, and also generate a diagnostic report based on the current change data, voltage change data and feedback signal.

[0010] Preferably, the power switching module includes a first control switch D01, a second control switch D02, a first contactor KM1 and a second contactor KM2;

[0011] The input end of the first control switch D01 is electrically connected to the power supply to obtain a DC power supply, and the control end of the first control switch D01 is electrically connected to the processing module. When controlling the electric actuator to perform a valve opening action, the processing module controls the first control switch D01 to close;

[0012] The input end of the second control switch D02 is electrically connected to the input end of the first control switch D01, and the control end of the second control switch D02 is electrically connected to the processing module. When controlling the electric actuator to perform the valve closing action, the processing module controls the second control switch D02 to close;

[0013] The first contactor KM1 includes a first excitation coil, a first normally closed contact circuit, a first normally open contact circuit, a second normally open contact circuit and a third normally open contact circuit, the first end of the first excitation coil is electrically connected to the output end of the first control switch D01, the first ends of the first normally open contact circuit, the second normally open contact circuit and the third normally open contact circuit are electrically connected to the A phase, B phase and C phase of the AC power output by the power supply, and the second ends of the first normally open contact circuit, the second normally open contact circuit and the third normally open contact circuit are respectively used to electrically connect the A phase, B phase and C phase of the electric actuator;

[0014] The second contactor KM2 includes a second excitation coil, a second normally closed contact loop, a fourth normally open contact loop, a fifth normally open contact loop and a sixth normally open contact loop. The first end of the second excitation coil is electrically connected to the output end of the first control switch D01, and the second end is electrically connected to the ground via the first normally closed contact loop. The second normally closed contact loop is connected between the second end of the first excitation coil and the ground. The first ends of the fourth normally open contact loop, the fifth normally open contact loop and the sixth normally open contact loop are electrically connected to the first ends of the first normally open contact loop, the second normally open contact loop and the third normally open contact loop in sequence. The second ends of the fourth normally open contact loop, the fifth normally open contact loop and the sixth normally open contact loop are electrically connected to the second ends of the third normally open contact loop, the second normally open contact loop and the first normally open contact loop in sequence.

[0015] Preferably, the feedback module comprises a first relay SL1, a second relay ST1, a third relay SL2 and a fourth relay ST2;

[0016] The normally closed contact circuit of the first relay SL1 is electrically connected between the second end of the second normally closed contact circuit and the ground, the first end of the normally open contact circuit of the first relay SL1 is electrically connected to the DC power supply, the second end of the normally open contact circuit of the first relay SL1 is electrically connected to the processing module, and can be electrically connected to the open position switch of the electric actuator, the excitation coil of the first relay SL1 is electrically connected to the processing module, and is excited when the electric actuator is set to the torque working mode and performs the valve opening action;

[0017] The normally closed contact circuit of the second relay ST1 is connected in parallel with the normally closed contact circuit of the first relay SL1, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the first relay SL1. The excitation coil of the second relay ST1 is electrically connected to the processing module and is excited when the electric actuator is set to the stroke working mode and performs the valve opening action.

[0018] The normally closed contact circuit of the third relay SL2 is electrically connected between the second end of the first normally closed contact circuit and the ground, the first end of the normally open contact circuit of the third relay SL2 is electrically connected to the DC power supply, the second end of the normally open contact circuit of the third relay SL2 is electrically connected to the processing module, and can be electrically connected to the closed position switch of the electric actuator, the excitation coil of the third relay SL2 is electrically connected to the processing module, and is excited when the electric actuator is set to the torque working mode and performs the valve closing action;

[0019] The normally closed contact circuit of the fourth relay ST2 is connected in parallel with the normally closed contact circuit of the third relay SL2, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the third relay SL2. The excitation coil of the fourth relay ST2 is electrically connected to the processing module and is energized when the electric actuator is set to the stroke working mode and performs the valve closing action.

[0020] Preferably, the feedback module further includes a first switch and a second switch;

[0021] The first end of the first switch is electrically connected to the DC power supply, and the second end of the first switch is electrically connected to the processing module and can be electrically connected to the opening process feedback switch of the electric actuator; wherein the first switch is the seventh normally open contact loop included in the first contactor KM1;

[0022] The first end of the second switch is electrically connected to the DC power supply, the second end of the second switch is electrically connected to the processing module, and can be electrically connected to the closing process feedback switch of the electric actuator; wherein, the second switch is the eighth normally open contact circuit included in the second contactor KM2.

[0023] Preferably, the measurement module includes a current transformer and a voltage transformer;

[0024] The current transformer is coupled to a connecting cable between the power supply phase-changing module and the electric actuator, and the current transformer is also electrically connected to the processing module to transmit the measured current change data to the processing module;

[0025] The voltage transformer is coupled to a connection cable between the power supply phase-changing module and the electric actuator, and the voltage transformer is also electrically connected to the processing module to transmit measured voltage change data to the processing module.

[0026] Preferably, the power supply includes a generator and a voltage conversion module;

[0027] The generator is used to output AC power;

[0028] The voltage conversion module is electrically connected to the generator to convert AC power into DC power.

[0029] Preferably, the processing module includes a first input unit, a second input unit, a first output unit, a second output unit and a data processing unit;

[0030] The first input unit is electrically connected to the feedback module and is used to process the feedback signal;

[0031] The second input unit is electrically connected to the measurement module and is used to process the current change data and the voltage change data;

[0032] The first output unit is electrically connected to the power commutation module, and is used to output the mode setting instruction and the commutation and power supply control instruction; wherein the working mode includes a torque working mode and a stroke working mode;

[0033] The second output unit may be electrically connected to the electric actuator and is used to output the motion control instruction;

[0034] The data processing unit is electrically connected to the first input unit, the second input unit, the first output unit and the second output unit, and is used to determine whether the electric actuator has an abnormal operating condition based on the processed current change data, the voltage change data and the feedback signal. When the electric actuator has an abnormal condition, the electric actuator is shut down by controlling the first output unit to operate. When the electric actuator is normal, a diagnostic report is generated based on the current change data and the voltage change data; wherein the abnormal operating condition includes overcurrent and / or reversal.

[0035] Preferably, the data processing unit comprises an abnormality analysis unit, a control unit and a report generation unit;

[0036] The abnormality analysis unit is electrically connected to the first input unit and the second input unit, and is used to perform the following analysis: determine whether the current change data is greater than the set current, and when the current change data is greater than the set current, determine whether the duration of the current change data being greater than the set current is greater than the set time, and when the duration is greater than the set time, determine that the electric actuator is overcurrent; determine the actual execution action of the electric actuator according to the feedback signal, and determine whether the actual execution action is consistent with the theoretical execution action controlled by the control unit, and when the actual execution action is inconsistent with the theoretical execution action, determine that the electric actuator is reversed;

[0037] The control unit is electrically connected to the first output unit, the second output unit and the abnormality analysis unit, and is used to control the operation of the first input unit and the second input unit according to the maintenance instruction to set the operation mode and control the electric actuator to open or close the valve, and when it is determined that the electric actuator is overcurrent or reversed, the electric actuator is stopped by controlling the operation of the first output unit;

[0038] The report generating unit is electrically connected to the first input unit and the second input unit, and is used to compare the current change data and the voltage change data with the predicted corresponding historical maintenance data, and determine technical parameters based on the current change data, the voltage change data and the feedback signal, so as to generate a diagnostic report based on the comparison result and the technical parameters; wherein the technical parameters include at least one of starting current, active power, reactive power, three-phase current imbalance, runaway stroke and lead time.

[0039] Preferably, the electric actuator maintenance device further includes a human-machine interaction unit;

[0040] The human-computer interaction unit is electrically connected to the control unit and the report generating unit, and is used to generate the maintenance instruction according to the operation and display the diagnosis report.

[0041] Preferably, the electric actuator maintenance device further comprises a housing for accommodating the power commutation module, the feedback module and the processing module, wherein the housing comprises a first side surface, and the first side surface is provided with a power input interface, a power output interface and a plurality of connectors;

[0042] The power input interface is electrically connected to the power supply, the power output interface can be electrically connected to the electric actuator, the measurement module is electrically connected to the processing module through a connector, and the electric actuator can be electrically connected to the feedback module and the processing module through a connector.

[0043] The technical solution of the present invention can automatically inspect the performance of the electric actuator during the overhaul power outage of the nuclear power plant and obtain a diagnosis report, which helps to improve the maintenance efficiency of the electric actuator and shorten the overhaul period. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0045] Figure 1 is a circuit structure block diagram of an electric actuator maintenance device in some embodiments of the present invention;

[0046] Figure 2 is a partial circuit schematic diagram of a power commutation module in some embodiments of the present invention;

[0047] Figure 3 is a circuit schematic diagram of a power commutation module, a measurement module and a feedback module in some embodiments of the present invention;

[0048] Figure 4 is a circuit structure block diagram of a processing module in some embodiments of the present invention;

[0049] Figure 5 is a circuit structure block diagram of a data processing unit in some embodiments of the present invention;

[0050] Figure 6 It is a schematic diagram of the structure of the electric actuator maintenance device in some embodiments of the present invention. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0052] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0053] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0054] The present invention provides an electric actuator maintenance device, which can be used to perform maintenance on the performance of the electric actuator during a power outage during overhaul of a nuclear power plant, thereby helping to improve the maintenance efficiency of the electric actuator and shorten the overhaul period. Figure 1 As shown, the electric actuator maintenance device may include a power supply 1 , a power supply phase change module 2 , a measurement module 3 , a feedback module 4 and a processing module 5 .

[0055] The function of the power supply 1 is to provide the power required for the maintenance of the electric actuator during the power outage during the overhaul of the nuclear power plant.

[0056] In some embodiments, the power supply 1 may include a generator and a voltage conversion module.

[0057] The generator is used to output AC power. The generator can be a diesel generator that can output 380V three-phase AC power, which is used to power the electric actuator. It can be understood that the diesel generator is not limited by the factory power supply and can supply power at any time, which can ensure that the electric actuator maintenance device is provided with power for maintenance during the overhaul power outage.

[0058] The voltage conversion module is electrically connected to the generator to convert the AC power into a DC power. The voltage conversion module can be an existing switching voltage conversion module or circuit, which can convert the AC power into a DC power of a certain voltage (such as 24V), and the DC power is used to power the feedback module 4 and the processing module 5.

[0059] See also Figure 1 The input end of the power phase-changing module 2 is electrically connected to the power supply 1, and the output end of the power phase-changing module 2 can be electrically connected to the electric actuator. The power phase-changing module 2 is used to control the phase line connection relationship between the electric actuator and the power supply 1 according to the phase-changing and power supply control instructions. The power phase-changing module 2 can quickly change the phase of the AC power phase line input to the electric actuator based on the phase-changing and power supply control instructions to prepare for controlling the electric actuator to perform a valve opening action or a valve closing action. When the electric actuator is abnormal, the power phase-changing module 2 can also disconnect the connection between the power supply 1 and the electric actuator to protect the electric actuator.

[0060] In some embodiments, Figure 2 and Figure 3 As shown, the power switching module 2 may include a first control switch D01, a second control switch D02, a first contactor KM1 and a second contactor KM2.

[0061] See also Figure 3, the input end of the first control switch D01 is electrically connected to the voltage conversion module in the power supply 1 to obtain the DC power outputted therefrom, the control end of the first control switch D01 is electrically connected to the processing module 5 (not shown), and when the electric actuator is controlled to perform the valve opening action, the processing module 5 controls the first control switch D01 to close. The input end of the second control switch D02 is electrically connected to the input end of the first control switch D01, and the control end of the second control switch D02 is electrically connected to the processing module 5 (not shown), and when the electric actuator is controlled to perform the valve closing action, the processing module 5 controls the second control switch D02 to close. Wherein, both the first control switch D01 and the second control switch D02 can be relays, and accordingly, the control end of the first control switch D01 (or the second control switch D02) corresponds to the excitation coil of the relay, and the input end and the output end of the first control switch D01 (or the second control switch D02) correspond to the two ends of the normally open contact loop of the relay. It can be understood that the processing module 5 can control the input end and the output end of the first control switch D01 (or the second control switch D02) to be closed or opened by controlling whether the relay is excited.

[0062] See also Figure 2 and Figure 3 The first contactor KM1 includes a first excitation coil 101, a first normally closed contact circuit 102, a first normally open contact circuit 103, a second normally open contact circuit 104 and a third normally open contact circuit 105. The first end of the first excitation coil 101 is electrically connected to the output end of the first control switch D01, the first ends of the first normally open contact circuit 103, the second normally open contact circuit 104 and the third normally open contact circuit 105 are electrically connected to the A phase, B phase and C phase of the AC power output by the power supply 1, and the second ends of the first normally open contact circuit 103, the second normally open contact circuit 104 and the third normally open contact circuit 105 are respectively used to electrically connect to the A phase, B phase and C phase of the electric actuator G1. The second contactor KM2 includes a second excitation coil 201, a second normally closed contact loop 202, a fourth normally open contact loop 203, a fifth normally open contact loop 204 and a sixth normally open contact loop 205. The first end of the second excitation coil 201 is electrically connected to the output end of the first control switch D01, and the second end is electrically connected to the ground via the first normally closed contact loop 102. The second normally closed contact loop 202 is connected between the second end of the first excitation coil 101 and the ground. The first ends of the fourth normally open contact loop 203, the fifth normally open contact loop 204 and the sixth normally open contact loop 205 are electrically connected to the first ends of the first normally open contact loop 103, the second normally open contact loop 104 and the third normally open contact loop 105 in sequence. The second ends of the fourth normally open contact loop 203, the fifth normally open contact loop 204 and the sixth normally open contact loop 205 are electrically connected to the second ends of the third normally open contact loop 105, the second normally open contact loop 104 and the first normally open contact loop 103 in sequence. In addition, if Figure 3As shown, the first normally closed contact loop 102 and the second normally closed contact loop 202 also form a circuit structure that restricts each other, which can prevent the first excitation coil 101 and the second excitation coil 201 from being excited at the same time.

[0063] It should be noted that the function of the power phase switching module 2 is to control the connection phase sequence between the electric actuator and the power supply 1, and to control the on-off between the electric actuator and the power supply 1, and the execution action of the electric actuator is controlled by the action control instruction.

[0064] To avoid overcurrent damage to the electric actuator, in some embodiments, Figure 2 As shown, the power switching module 2 also includes three first fuses FU1, which are electrically connected one-to-one between phase A, phase B and phase C of the AC power supply and the first ends of the first normally open contact circuit 103, the second normally open contact circuit 104 and the third normally open contact circuit 105.

[0065] See also Figure 2 and Figure 3 The working principle of the processing module 5 controlling the phase line connection relationship between the power supply source 1 and the electric actuator G1 through the power phase switching module 2 is as follows:

[0066] Valve opening operation: the processing module 5 controls the first control switch D01 to close and the second control switch D02 to open, so that the first excitation coil 101 is excited and the second excitation coil 201 is demagnetized, thereby closing the first normally open contact circuit 103, the second normally open contact circuit 104 and the third normally open contact circuit 105. Therefore, the A phase, B phase and C phase of the electric actuator G1 are respectively electrically connected to the A phase, B phase and C phase of the generator in the power supply source 1, and the motor in the electric actuator G1 rotates forward, and the electric actuator G1 performs the valve opening action;

[0067] Valve closing operation: the processing module 5 controls the first control switch D01 to be disconnected and the second control switch D02 to be closed, so that the first excitation coil 101 is demagnetized and the second excitation coil 201 is excited, thereby closing the fourth normally open contact circuit 203, the fifth normally open contact circuit 204 and the sixth normally open contact circuit 205. Therefore, the A phase, B phase and C phase of the electric actuator G1 are respectively electrically connected to the C phase, B phase and A phase of the generator in the power supply source 1, and the motor in the electric actuator G1 rotates in the reverse direction, and the electric actuator G1 performs the valve closing action;

[0068] Shutdown operation: the processing module 5 controls the first control switch D01 and the second control switch D02 to be disconnected, so that the first excitation coil 101 and the second excitation coil 201 are demagnetized, and the first to sixth normally open contact loops are disconnected, so that the electric actuator G1 loses power and stops operating.

[0069] See also Figure 1 The measuring module 3 is connected to the power switching module 2, and the measuring module 3 is used to measure the current change data and the voltage change data when the electric actuator G1 executes the set action process.

[0070] In some embodiments, Figure 2 As shown, the measuring module 3 may include a current transformer 31 and a voltage transformer 32. The current transformer 31 may be sleeved on the connecting cable between the power commutation module 2 and the electric actuator, and then coupled with the connecting cable to sense the real-time current change data input to the electric actuator. The current transformer 31 is also electrically connected to the processing module 5 to transmit the measured current change data to the processing module 5. The voltage transformer 32 may also be sleeved on the connecting cable between the power commutation module 2 and the electric actuator, and then coupled with the connecting cable to sense the real-time voltage change data input to the electric actuator. The voltage transformer 32 is also electrically connected to the processing module 5 to transmit the measured voltage change data to the processing module 5.

[0071] See also Figure 1 The feedback module 4 is used to electrically connect to the electric actuator to output a feedback signal that can feed back the real-time status of the electric actuator.

[0072] It should be noted that the electric actuator generally includes two working modes, namely the torque working mode and the stroke working mode. The torque working mode means that when the output of the electric actuator reaches a certain torque (such as when the valve reaches the fully open position, the torque will increase due to the limited stroke of the electric actuator), the electric actuator will stop operating. Accordingly, the electric actuator is internally configured with corresponding open position switches that can reflect whether the valve has reached the fully open position, closed position switches that can reflect whether the valve has reached the fully closed position, open process feedback switches that can reflect that the valve is performing the valve opening action, and closed process feedback switches that can reflect that the valve is performing the valve closing action. The function of the feedback module 4 is to obtain the corresponding feedback signal by being electrically connected to the relevant state feedback switches in the electric actuator.

[0073] In some embodiments, Figure 3 As shown, the feedback module 4 includes a first relay SL1, a second relay ST1, a third relay SL2 and a fourth relay ST2.

[0074] See also Figure 3, the normally closed contact circuit of the first relay SL1 is electrically connected between the second end of the second normally closed contact circuit 202 and the ground, the first end of the normally open contact circuit of the first relay SL1 is electrically connected to the voltage conversion module in the power supply 1 to obtain the DC power outputted therefrom, the second end of the normally open contact circuit of the first relay SL1 is electrically connected to the processing module 5, and can be electrically connected to the fully opened switch DI 02 of the electric actuator, the excitation coil of the first relay SL1 is electrically connected to the processing module 5 (not shown), when the electric actuator is set to the torque working mode and is performing the valve opening action, the processing module 5 controls the excitation of the excitation coil of the first relay SL1, so that the processing module 5 can determine whether the electric actuator opens the valve to the fully opened position according to the level of the second end of the normally open contact circuit of the first relay SL1, further, when the second end of the normally open contact circuit of the first relay SL1 is at a high level, it indicates that the fully opened switch DI 02 is disconnected, indicating that the electric actuator has opened the valve to the fully opened position, and when the second end of the normally open contact circuit of the first relay SL1 is at a low level, it indicates that the fully opened switch DI 02 is closed, indicating that the electric actuator has not opened the valve to the fully open position.

[0075] See also Figure 3 The normally closed contact circuit of the second relay ST1 is connected in parallel with the normally closed contact circuit of the first relay SL1, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the first relay SL1. The excitation coil of the second relay ST1 is electrically connected to the processing module 5 (not shown). When the electric actuator is set to the stroke working mode and is performing the valve opening action, the processing module 5 controls the excitation of the excitation coil of the second relay ST1. In this way, the processing module 5 can determine whether the electric actuator opens the valve to the fully open position according to the level of the second end of the normally open contact circuit of the second relay ST1. Further, when the second end of the normally open contact circuit of the second relay ST1 is at a high level, it indicates that the open position switch DI 02 is disconnected, indicating that the electric actuator has opened the valve to the fully open position. When the second end of the normally open contact circuit of the second relay ST1 is at a low level, it indicates that the open position switch DI 02 is closed, indicating that the electric actuator has not opened the valve to the fully open position.

[0076] See also Figure 3, the normally closed contact circuit of the third relay SL2 is electrically connected between the second end of the first normally closed contact circuit 102 and the ground, the first end of the normally open contact circuit of the third relay SL2 is electrically connected to the voltage conversion module in the power supply 1 to obtain the DC power outputted therefrom, the second end of the normally open contact circuit of the third relay SL2 is electrically connected to the processing module 5, and can be electrically connected to the fully closed switch DI 04 of the electric actuator, the excitation coil of the third relay SL2 is electrically connected to the processing module 5 (not shown), when the electric actuator is set to the torque working mode and is performing the valve closing action, the processing module 5 controls the excitation of the excitation coil of the third relay SL2, so that the processing module 5 can determine whether the electric actuator has closed the valve to the fully closed position according to the level of the second end of the normally open contact circuit of the third relay SL2, further, when the second end of the normally open contact circuit of the third relay SL2 is at a high level, it indicates that the fully closed switch DI 04 is disconnected, indicating that the electric actuator has closed the valve to the fully closed position, and when the second end of the normally open contact circuit of the third relay SL2 is at a low level, it indicates that the fully closed switch DI 04 is closed, indicating that the electric actuator has not closed the valve to the fully open position.

[0077] See also Figure 3 The normally closed contact circuit of the fourth relay ST2 is connected in parallel with the normally closed contact circuit of the third relay SL2, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the third relay SL2. The excitation coil of the fourth relay ST2 is electrically connected to the processing module 5 (not shown). When the electric actuator is set to the stroke working mode and is performing the valve closing action, the processing module 5 controls the excitation of the excitation coil of the fourth relay ST2. In this way, the processing module 5 can determine whether the electric actuator closes the valve to the fully closed position according to the level of the second end of the normally open contact circuit of the fourth relay ST2. Further, when the second end of the normally open contact circuit of the fourth relay ST2 is at a high level, it indicates that the closed position switch DI 04 is disconnected, indicating that the electric actuator has closed the valve to the fully closed position. When the second end of the normally open contact circuit of the fourth relay ST2 is at a low level, it indicates that the closed position switch DI 04 is closed, indicating that the electric actuator has not closed the valve to the fully open position.

[0078] In some embodiments, Figure 3As shown, the feedback module 4 also includes a first switch 41 and a second switch 42. The first end of the first switch 41 is electrically connected to the voltage conversion module in the power supply 1 to obtain the DC power outputted by it, and the second end of the first switch 41 is electrically connected to the processing module 5, and can be electrically connected to the opening process feedback switch DI 01 of the electric actuator. The first end of the second switch 42 is electrically connected to the voltage conversion module in the power supply 1 to obtain the DC power outputted by it, and the second end of the second switch 42 is electrically connected to the processing module 5, and can be electrically connected to the closing process feedback switch DI 03 of the electric actuator. Among them, the first switch 41 can be the seventh normally open contact loop included in the first contactor KM1, and the second switch 42 can be the eighth normally open contact loop included in the second contactor KM2. When the electric actuator performs the valve opening action, the seventh normally open contact circuit will be closed due to the excitation of the first contactor KM1, so that the processing module 5 can determine whether the electric actuator is performing the valve opening action according to the second end level of the first switch 41. When the second end of the first switch 41 is at a high level, it indicates that the opening process feedback switch DI01 is closed, indicating that the electric actuator is performing the valve opening action. Conversely, when the second end of the first switch 41 is at a low level, the opening process feedback switch DI01 is disconnected, indicating that the electric actuator is not performing the valve opening action.

[0079] When the electric actuator performs the valve closing action, the eighth normally open contact circuit will be closed due to the excitation of the second contactor KM2, so that the processing module 5 can determine whether the electric actuator is performing the valve opening action according to the second end level of the second switch 42. When the second end of the second switch 42 is at a high level, it indicates that the closing process feedback switch DI 03 is closed, indicating that the electric actuator is performing the valve closing action. Conversely, when the second end of the second switch 42 is at a low level, the closing process feedback switch DI 03 is disconnected, indicating that the electric actuator is not performing the valve closing action.

[0080] It should be noted that some electric actuators include state feedback switches that have a certain conduction resistance (greater than 1 kiloohm) when turned on, so each normally open contact circuit can be directly electrically connected to each state feedback switch. Of course, to ensure that the state feedback switch is closed, the DC power supply is pulled down. A resistor with a certain resistance (greater than 1 kiloohm) can also be connected in series on the connection cable between each state feedback switch and the corresponding normally open contact circuit.

[0081] See also Figure 1 The processing module 5 is electrically connected to the power commutation module 2, the measurement module 3 and the feedback module 4. The processing module 5 is used to input a mode setting instruction that can set the working mode of the electric actuator, and output a commutation and power supply control instruction to control the electric actuator to execute the set action process, and also generate a diagnostic report based on the current change data, the voltage change data and the feedback signal.

[0082] In some embodiments, Figure 4 As shown, the processing module 5 may include a first input unit 51 , a second input unit 52 , a first output unit 53 , a second output unit 54 and a data processing unit 55 .

[0083] See also Figure 4 , the first input unit 51 is electrically connected to the feedback module 4, and the first input unit 51 is used to process the switch quantity feedback signal included in the feedback signal. Since the voltage amplitude of the switch quantity feedback signal is relatively high (such as the second terminal voltage of the first switch 41 and the second switch 42, up to 24V), and the working voltage of the data processing unit 55 in this embodiment is relatively low (below 5V), it is necessary to reduce the amplitude of the switch quantity feedback signal through the first input unit 51, thereby facilitating the detection of the data processing unit 55 and avoiding overvoltage damage to the data processing unit 55. The first input unit 51 can be an existing step-down circuit or a voltage divider circuit.

[0084] See also Figure 4 , the second input unit 52 is electrically connected to the measurement module 3, and the second input unit 52 is used to process the analog feedback signal, current change data and voltage change data included in the feedback signal. For the current change data and the voltage change data, the current transformer 31 and the voltage transformer 32 in the measurement module 3 output analog signals, and a large amount of noise is usually superimposed on the analog signals. In order to improve the signal quality, the current change data and the voltage change data are first filtered by the second input unit 52 to filter out the noise, and then the current change data and the voltage change data are amplified, and then the amplified signals are converted into digital signals, and finally the digital signals are sent to the data processing unit 55. For the analog feedback signal, its function is to characterize the real-time stroke of the electric actuator. In this embodiment, the analog feedback signal is converted into a digital signal by the second input unit 52, and the corresponding digital signal is sent to the data processing unit 55.

[0085] Furthermore, the second input unit 52 may include an existing bandpass filter, an amplifier circuit, a first AD conversion circuit, and a second AD conversion circuit. The bandpass filter is used to filter out the noise in the current change data and the voltage change data except for the set frequency range (45Hz to 55Hz) to obtain the filtered current change data and the voltage change data; the amplifier circuit is used to amplify the amplitude of the filtered current change data and the voltage change data to obtain the amplified current change data and the voltage change data; the first AD conversion circuit is used to convert the amplified current change data and the voltage change data into digital signals, and send the converted current change data and the voltage change data to the data processing unit 55. The second AD conversion circuit is used to convert the analog feedback signal into a digital signal, and send the converted analog feedback signal to the data processing unit 55, so that the data processing unit 55 can learn the real-time stroke of the electric actuator.

[0086] See also Figure 4 , the first output unit 53 is electrically connected to the power phase-changing module 2, and the first output unit 53 is used to output mode setting instructions and phase-changing and power supply control instructions; wherein, the working mode includes torque working mode and stroke working mode. Since the working voltage of the data processing unit 55 in this embodiment is relatively low, the voltage that can be output is not higher than the working voltage (5V), so it is impossible to directly drive the relay (the working voltage of the relay is generally 12V, 24V, etc.), so it is necessary to amplify the voltage amplitude of the digital signal output by the data processing unit 55 through the first output unit 53, so as to meet the demand of driving the relay excitation coil to work. The first output unit 53 can be an existing amplifier circuit, such as a digital signal amplifier circuit composed of a Darlington tube. It can be understood that the function of the first output unit 53 is to output the phase-changing and power supply control instructions according to the control of the data processing unit 55, so as to control the on and off of the first control switch D01 and the second control switch D02, and then control the phase line connection relationship between the electric actuator and the power supply 1, and output the mode setting instruction (as a switch signal) to the electric actuator, so as to set the working mode of the electric actuator.

[0087] See also Figure 4 , the second output unit 54 can be electrically connected to the electric actuator, and the second output unit 54 is used to output the action control instruction. In a nuclear power plant, some existing electric actuators communicate with the corresponding control system through a 4-20mA current signal, and the data processing unit 55 cannot output a current signal. In this embodiment, the data processing unit 55 works through the second output unit 54 to input a 4-20mA current signal to the electric actuator, thereby controlling the electric actuator to execute a set action process, such as automatically controlling the valve to open from the middle position to the fully open position, and then close from the fully open position to the fully closed position.

[0088] See also Figure 4 The data processing unit 55 is electrically connected to the first input unit 51, the second input unit 52, the first output unit 53 and the second output unit 54. The data processing unit 55 is used to determine whether the electric actuator has an abnormal operating condition based on the processed current change data, voltage change data and feedback signal. When the electric actuator has an abnormal condition, the electric actuator is shut down by controlling the first output unit 53 to operate. When the electric actuator is normal, a diagnostic report is generated based on the current change data and the voltage change data; wherein the abnormal operating condition includes overcurrent and / or reversal.

[0089] In some embodiments, Figure 5 As shown, the data processing unit 55 may include an abnormality analysis unit, a control unit, and a report generation unit.

[0090] See also Figure 5 The abnormal analysis unit is electrically connected to the first input unit 51 and the second input unit 52, and is used to perform the following analysis: determine whether the current change data is greater than the set current, and when the current change data is greater than the set current, determine whether the duration of the current change data being greater than the set current is greater than the set time, and when the duration is greater than the set time, determine that the electric actuator is overcurrent; determine the actual execution action of the electric actuator according to the analog feedback signal included in the feedback signal, and determine whether the actual execution action is consistent with the theoretical execution action controlled by the control unit, and when the actual execution action is inconsistent with the theoretical execution action, determine that the electric actuator is reversed. Among them, the set current can be 4 to 8 times the rated working current of the electric actuator, and the set current is preferably 6 times the rated working current of the electric actuator; the setting time can range from 30us to 70us, and the setting time is preferably 50us.

[0091] It should be noted that the abnormal analysis unit can determine the real-time stroke change of the electric actuator based on the analog feedback signal, and then obtain the actual execution action of the electric actuator. The abnormal analysis unit can also communicate with the control unit to obtain the mode setting instructions, action control instructions, and commutation and power supply control instructions actually output by the control unit, and then determine the theoretical execution action of the electric actuator.

[0092] See also Figure 5The control unit is electrically connected to the first output unit 53, the second output unit 54 and the abnormality analysis unit, and is used to control the operation of the first input unit 51 and the second input unit 52 according to the maintenance instruction (i.e., input mode setting instructions, action control instructions, and phase change and power supply control instructions to the relevant units) to set the working mode and control the electric actuator to open or close the valve, and when it is determined that the electric actuator is overcurrent or reversed, the electric actuator is stopped by controlling the operation of the first output unit 53.

[0093] See also Figure 5 The report generating unit is electrically connected to the first input unit 51 and the second input unit 52, and is used to compare the current change data and the voltage change data with the predicted corresponding historical maintenance data, and determine the technical parameters according to the current change data, the voltage change data and the feedback signal, so as to generate a diagnostic report according to the comparison result and the technical parameters; wherein the technical parameters include at least one of starting current, active power, reactive power, three-phase current imbalance, runaway stroke and lead time.

[0094] Specifically, the data processing unit 55 also includes a storage device, which is used to store historical maintenance data of the electric actuator, including current change history data and voltage change history data. Accordingly, the current change data will be compared with the current change history data, and the voltage change data will be compared with the voltage change history data, so as to obtain corresponding comparison results. Further, the specific comparison method may include: fitting corresponding change curves according to the current change data and the voltage change data, respectively, to obtain the current change curve and the voltage change curve, and then placing the current change curve and the current history change curve, and the voltage change curve and the voltage history change curve in the same coordinate system, respectively, to obtain the comparison result.

[0095] The step of determining the starting current may include: analyzing the current change data, and determining the current value when the current increases from a value equal to or close to zero to a certain value and tends to be stable as the starting current. When the current change rate is less than a set change rate, it is determined that the current tends to be stable, and the range of the set change rate is ±5%.

[0096] The step of determining the active power and the reactive power may include: calculating the active power and the reactive power according to the current change data, the voltage change data and the preset current and voltage phase angles.

[0097] The step of determining the three-phase current unbalance may include: analyzing the current change data, determining the maximum value and the minimum value of the three-phase current, and calculating the three-phase current unbalance according to the maximum value and the minimum value of the three-phase current. The expression of the three-phase current unbalance can be: D = [max (I A , I B , IC )-min(I A , I B , I C )] / [max(I A , I B , I C )+min(I A , I B , I C )],max(I A , I B , I C ) represents the maximum value of three-phase current, min(I A , I B , I C ) represents the minimum value of three-phase current.

[0098] The step of determining the travel distance may include: analyzing current change data, and when it is detected that the current drops to equal to or close to zero, determining the travel amount of the electric actuator after power failure according to the analog feedback signal to obtain the travel distance.

[0099] The step of determining the advance time may include: monitoring current change data to determine the moment when the current drops to equal to or close to zero, so as to obtain the power-off time; monitoring the switch feedback signal to determine the opening time (i.e. the moment when the valve is opened to the fully open position) or the closing time (i.e. the moment when the valve is closed to the fully open position), and calculating the difference between the power-off time and the opening time or the closing time to obtain the said advance time.

[0100] In order to improve the inspection and observation effect of the present invention, in some embodiments, the report generation unit is also used to output the real-time stroke change of the electric actuator in real time, and calculate the power factor based on the current change data and the voltage change data.

[0101] It should be noted that the data processing unit 55 may include an existing microprocessor, and when the microprocessor executes a computer program, it can implement the data processing and analysis steps of the abnormality analysis unit, the control unit and the report generation unit.

[0102] In some embodiments, Figure 5 As shown, the electric actuator maintenance device may further include a human-machine interaction unit 6. The human-machine interaction unit 6 is electrically connected to the control unit and the report generation unit, and is used to generate maintenance instructions according to the operation, and to display the diagnostic report. In addition, the human-machine interaction unit 6 may be a tablet computer, and the staff may retrieve historical diagnostic reports, historical maintenance data, etc. according to the needs, and realize the electric control of the electric actuator by operating the tablet computer, such as controlling the opening, closing and shutdown of the valve.

[0103] In some embodiments, Figure 6As shown, the electric actuator maintenance device may also include a housing 7 for accommodating the power commutation module 2, the feedback module 4 and the processing module 5. The housing 7 includes a first side 71 and a second side 78. The first side 71 is provided with a power input interface 72, a power output interface 73 and a plurality of connectors 74. The power input interface is electrically connected to the power supply 1, the power output interface can be electrically connected to the electric actuator, the measurement module 3 can be electrically connected to the processing module 5 through the connector, the electric actuator can be electrically connected to the feedback module 4 and the processing module 5 through the connector, and the human-machine interaction unit 6 is provided on the second side 78. In order to improve the waterproof performance of the device, the connector 74 is preferably a Lemo connector.

[0104] In order to avoid overcurrent damage to the first contactor KM1 and the second contactor KM2, in some embodiments, as Figure 3 As shown, the electric actuator maintenance device may further include a second fuse FU2, which is connected in series between the voltage conversion module in the power supply 1 and the input end of the first control switch D01.

[0105] In some embodiments, the electric actuator maintenance device may further include a plurality of operation buttons 76, one of which is electrically connected between the voltage conversion module and the second fuse FU2, so that the operator can operate the button to control the on and off of the first contactor KM1 and the second contactor KM2. The remaining operation buttons 76 are connected to the first input unit 51, so that the operator can input relevant operation instructions to the control unit in the data processing unit 55 by operating these operation buttons 76, such as emergency stop of the electric head, opening the valve, closing the valve, etc.

[0106] In some embodiments, Figure 2 and Figure 6 As shown, the electric actuator maintenance device may further include a circuit breaker 75 connected in series between the power supply and each first fuse FU1, and a worker may manually operate the circuit breaker 75 to control the power supply of the electric actuator.

[0107] To improve the portability of the device, in some embodiments, Figure 6 As shown, a handle 77 is provided on the top surface of the housing 7.

[0108] It can be understood that the present invention can facilitate workers to perform wiring operations on site in the factory by arranging all components that require connection interfaces and connectors on the first side 71. Moreover, the power input interface 72 and the power output interface 73 are preferably arranged at the bottom of the first side 71 (i.e., away from the operation button 76) to minimize the risk of electric shock when the workers operate.

[0109] It can be understood that during the power outage for overhaul of a nuclear power plant, the present invention can be used to automatically inspect the performance of the electric actuator based on a preset set action process and obtain a diagnostic report. The automation process is high, which improves the maintenance efficiency of the electric actuator and helps to shorten the overhaul period of the nuclear power plant.

[0110] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0111] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0112] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0113] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. An electric actuator maintenance device, characterized in that: include: Power supply; A power commutation module, whose input end is electrically connected to the power supply, and whose output end can be electrically connected to the electric actuator, and is used to control the phase line connection relationship between the electric actuator and the power supply according to the commutation and power supply control instructions; A measuring module, connected to the power commutation module, for measuring current change data and voltage change data when the electric actuator executes a set action process; A feedback module, used for electrically connecting to the electric actuator to output a feedback signal capable of feeding back the real-time status of the electric actuator; as well as A processing module is electrically connected to the power commutation module, the measurement module and the feedback module, and is used to input mode setting instructions and action control instructions that can set the working mode of the electric actuator, and output the commutation and power supply control instructions to control the electric actuator to execute the set action process, and also generate a diagnostic report based on the current change data, voltage change data and feedback signal.

2. The electric actuator maintenance device according to claim 1, characterized in that: The power commutation module includes a first control switch D01, a second control switch D02, a first contactor KM1 and a second contactor KM2; The input end of the first control switch D01 is electrically connected to the power supply to obtain a DC power supply, and the control end of the first control switch D01 is electrically connected to the processing module. When controlling the electric actuator to perform a valve opening action, the processing module controls the first control switch D01 to close; The input end of the second control switch D02 is electrically connected to the input end of the first control switch D01, and the control end of the second control switch D02 is electrically connected to the processing module. When controlling the electric actuator to perform the valve closing action, the processing module controls the second control switch D02 to close; The first contactor KM1 includes a first excitation coil, a first normally closed contact circuit, a first normally open contact circuit, a second normally open contact circuit and a third normally open contact circuit, the first end of the first excitation coil is electrically connected to the output end of the first control switch D01, the first ends of the first normally open contact circuit, the second normally open contact circuit and the third normally open contact circuit are electrically connected to the A phase, B phase and C phase of the AC power output by the power supply, and the second ends of the first normally open contact circuit, the second normally open contact circuit and the third normally open contact circuit are respectively used to electrically connect the A phase, B phase and C phase of the electric actuator; The second contactor KM2 includes a second excitation coil, a second normally closed contact loop, a fourth normally open contact loop, a fifth normally open contact loop and a sixth normally open contact loop. The first end of the second excitation coil is electrically connected to the output end of the first control switch D01, and the second end is electrically connected to the ground via the first normally closed contact loop. The second normally closed contact loop is connected between the second end of the first excitation coil and the ground. The first ends of the fourth normally open contact loop, the fifth normally open contact loop and the sixth normally open contact loop are electrically connected to the first ends of the first normally open contact loop, the second normally open contact loop and the third normally open contact loop in sequence. The second ends of the fourth normally open contact loop, the fifth normally open contact loop and the sixth normally open contact loop are electrically connected to the second ends of the third normally open contact loop, the second normally open contact loop and the first normally open contact loop in sequence.

3. The electric actuator maintenance device according to claim 2, characterized in that: The feedback module includes a first relay SL1, a second relay ST1, a third relay SL2 and a fourth relay ST2; The normally closed contact circuit of the first relay SL1 is electrically connected between the second end of the second normally closed contact circuit and the ground, the first end of the normally open contact circuit of the first relay SL1 is electrically connected to the DC power supply, the second end of the normally open contact circuit of the first relay SL1 is electrically connected to the processing module, and can be electrically connected to the open position switch of the electric actuator, the excitation coil of the first relay SL1 is electrically connected to the processing module, and is excited when the electric actuator is set to the torque working mode and performs the valve opening action; The normally closed contact circuit of the second relay ST1 is connected in parallel with the normally closed contact circuit of the first relay SL1, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the first relay SL1. The excitation coil of the second relay ST1 is electrically connected to the processing module and is excited when the electric actuator is set to the stroke working mode and performs the valve opening action. The normally closed contact circuit of the third relay SL2 is electrically connected between the second end of the first normally closed contact circuit and the ground, the first end of the normally open contact circuit of the third relay SL2 is electrically connected to the DC power supply, the second end of the normally open contact circuit of the third relay SL2 is electrically connected to the processing module, and can be electrically connected to the closed position switch of the electric actuator, the excitation coil of the third relay SL2 is electrically connected to the processing module, and is excited when the electric actuator is set to the torque working mode and performs the valve closing action; The normally closed contact circuit of the fourth relay ST2 is connected in parallel with the normally closed contact circuit of the third relay SL2, and the normally open contact circuit is connected in parallel with the normally open contact circuit of the third relay SL2. The excitation coil of the fourth relay ST2 is electrically connected to the processing module and is energized when the electric actuator is set to the stroke working mode and performs the valve closing action.

4. The electric actuator maintenance device according to claim 3, characterized in that: The feedback module further includes a first switch and a second switch; The first end of the first switch is electrically connected to the DC power supply, and the second end of the first switch is electrically connected to the processing module and can be electrically connected to the opening process feedback switch of the electric actuator; wherein the first switch is the seventh normally open contact loop included in the first contactor KM1; The first end of the second switch is electrically connected to the DC power supply, the second end of the second switch is electrically connected to the processing module, and can be electrically connected to the closing process feedback switch of the electric actuator; wherein, the second switch is the eighth normally open contact circuit included in the second contactor KM2.

5. The electric actuator maintenance device according to claim 1, characterized in that: The measuring module includes a current transformer and a voltage transformer; The current transformer is coupled to a connecting cable between the power supply phase-changing module and the electric actuator, and the current transformer is also electrically connected to the processing module to transmit the measured current change data to the processing module; The voltage transformer is coupled to a connection cable between the power supply phase-changing module and the electric actuator, and the voltage transformer is also electrically connected to the processing module to transmit measured voltage change data to the processing module.

6. The electric actuator maintenance device according to claim 1, characterized in that: The power supply includes a generator and a voltage conversion module; The generator is used to output AC power; The voltage conversion module is electrically connected to the generator to convert AC power into DC power.

7. The electric actuator maintenance device according to any one of claims 1 to 6, characterized in that: The processing module includes a first input unit, a second input unit, a first output unit, a second output unit and a data processing unit; The first input unit is electrically connected to the feedback module and is used to process the feedback signal; The second input unit is electrically connected to the measurement module and is used to process the current change data and the voltage change data; The first output unit is electrically connected to the power commutation module, and is used to output the mode setting instruction and the commutation and power supply control instruction; wherein the working mode includes a torque working mode and a stroke working mode; The second output unit may be electrically connected to the electric actuator and is used to output the motion control instruction; The data processing unit is electrically connected to the first input unit, the second input unit, the first output unit and the second output unit, and is used to determine whether the electric actuator has an abnormal operating condition based on the processed current change data, the voltage change data and the feedback signal. When the electric actuator has an abnormal condition, the electric actuator is shut down by controlling the first output unit to operate. When the electric actuator is normal, a diagnostic report is generated based on the current change data and the voltage change data; wherein the abnormal operating condition includes overcurrent and / or reversal.

8. The electric actuator maintenance device according to claim 7, characterized in that: The data processing unit includes an abnormality analysis unit, a control unit and a report generation unit; The abnormality analysis unit is electrically connected to the first input unit and the second input unit, and is used to perform the following analysis: determine whether the current change data is greater than the set current, and when the current change data is greater than the set current, determine whether the duration of the current change data being greater than the set current is greater than the set time, and when the duration is greater than the set time, determine that the electric actuator is overcurrent; determine the actual execution action of the electric actuator according to the feedback signal, and determine whether the actual execution action is consistent with the theoretical execution action controlled by the control unit, and when the actual execution action is inconsistent with the theoretical execution action, determine that the electric actuator is reversed; The control unit is electrically connected to the first output unit, the second output unit and the abnormality analysis unit, and is used to control the operation of the first input unit and the second input unit according to the maintenance instruction to set the operation mode and control the electric actuator to open or close the valve, and when it is determined that the electric actuator is overcurrent or reversed, the electric actuator is stopped by controlling the operation of the first output unit; The report generating unit is electrically connected to the first input unit and the second input unit, and is used to compare the current change data and the voltage change data with the predicted corresponding historical maintenance data, and determine technical parameters based on the current change data, the voltage change data and the feedback signal, so as to generate a diagnostic report based on the comparison result and the technical parameters; wherein the technical parameters include at least one of starting current, active power, reactive power, three-phase current imbalance, runaway stroke and lead time.

9. The electric actuator maintenance device according to claim 8, characterized in that: It also includes a human-computer interaction unit; The human-computer interaction unit is electrically connected to the control unit and the report generating unit, and is used to generate the maintenance instruction according to the operation and display the diagnosis report.

10. The electric actuator maintenance device according to claim 7, characterized in that: It also includes a housing for accommodating the power switching module, the feedback module and the processing module, wherein the housing includes a first side surface, and the first side surface is provided with a power input interface, a power output interface and a plurality of connectors; The power input interface is electrically connected to the power supply, the power output interface can be electrically connected to the electric actuator, the measurement module is electrically connected to the processing module through a connector, and the electric actuator can be electrically connected to the feedback module and the processing module through a connector.

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