Steam turbine valve characteristics test device

Abstract

The present invention discloses a steam turbine valve characteristic testing device, comprising a box body, and within the box are arranged: a control card, an acquisition card connected to the control card, an acquisition interface connected to the acquisition card and a pressure sensor in an oil motor, and an industrial control computer connected to the control card and the acquisition card. The present invention enables a staff member to comprehensively and intuitively monitor the operation of a proportional valve and diagnose faults. Not only can the occurrence of a fault be predicted in advance and prompt the fault personnel to take corresponding measures, but the device can also replace the control system to control the proportional valve when the control system of the steam turbine valve is under maintenance, thereby improving the reliability of the steam turbine valve system.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment maintenance, and in particular to a steam turbine valve characteristic testing device. Background Art

[0002] In related technology, the steam turbines of a nuclear power plant are controlled by proportional control valves (proportional valves). Multiple faults, such as a stuck pilot valve, a stuck main valve, a faulty control component, or a signal transmission failure, can cause the proportional valves to momentarily close and open. Therefore, to maintain stable nuclear power plant operation, regular monitoring and testing of the proportional valves is necessary. While existing steam turbine valve systems monitor some proportional valve data, fault diagnosis methods are limited, making it difficult to effectively determine the cause of the fault or predict it in advance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a steam turbine valve characteristic testing device in view of at least one defect in the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a steam turbine valve characteristic test device, including a box body, and the box body is equipped with: a control card, an acquisition card, an acquisition interface and an industrial control computer;

[0005] The control card is used to control the operation of the proportional valve;

[0006] The acquisition card is connected to the control card and is used to acquire feedback signals and control signals from the control card; wherein the feedback signal includes at least one of a pilot valve feedback signal, a main valve feedback signal, and an oil motor feedback signal; and the control signal includes at least one of a coil current signal, a zero point command signal, a conditional command signal, a PID control signal, and an integrator output signal;

[0007] The acquisition interface is connected to the acquisition card and is also connected to the pressure sensor in the oil motor to send the oil pressure signal to the acquisition card;

[0008] The industrial computer is connected to the control card and the acquisition card, and is used to control the operation of the control card and process the feedback signal, control signal and oil pressure signal to generate corresponding characteristic curves.

[0009] Preferably, the box is a flip-top box, and an operation panel for controlling the industrial computer is further provided in the flip-top box;

[0010] The operation panel is provided with a selection switch unit for controlling the on and off of the feedback signal, realizing an enabling function and setting an operating mode.

[0011] Preferably, it also includes a touch screen provided on the inner side of the flip cover of the flip-cover box, the touch screen is connected to the industrial computer, and the touch screen is used to display the characteristic curves of the feedback signal, control signal and oil pressure signal in real time, and to obtain control instructions.

[0012] Preferably, the control card includes a zero-point command signal processing unit, which includes: a resistor R124, a resistor R123, an operational amplifier N10B, a resistor R126, a resistor R125, a resistor R122, a voltage regulator D15, a resistor R77, an inverter N6E, a diode T19A, an operational amplifier N10A, a resistor R111, a resistor R112, a resistor R110, a diode T19B, a resistor R78, an inverter N6D, a resistor R76, an NPN tube T20, a resistor R75, a PNP tube T17, a resistor R84, a diode D14, a resistor R85, a voltage regulator D52 and a resistor R7;

[0013] The second end of the resistor R124 is used to receive a zero control signal. The second end of the resistor R124 is also connected to the non-inverting input of the operational amplifier N10B via the resistor R123. The inverting input of the operational amplifier N10B is connected to ground via the resistor R126. The inverting input of the operational amplifier N10B is also connected to the positive end of the first DC voltage via the resistor R125. The output of the operational amplifier N10B is connected to the non-inverting input of the operational amplifier N10B via the resistor R122. The output of the operational amplifier N10B is also connected to the anode of the voltage regulator tube D15. The cathode of the voltage regulator tube D15 is connected to the second DC voltage via the resistor R77. The cathode of the voltage regulator tube D15 is also connected to the input of the inverter N6E. The output of the inverter N6E is connected to the anode of the diode T19A.

[0014] A first end of the resistor R124 is connected to the non-inverting input of the operational amplifier N10A, an inverting input of the operational amplifier N10A is connected to the negative terminal of the first DC voltage via the resistor R111, the inverting input of the operational amplifier N10A is further connected to ground via the resistor R112, a non-inverting input of the operational amplifier N10A is connected to the output of the operational amplifier N10A via the resistor R110, and the output of the operational amplifier N10A is connected to the anode of the diode T19B;

[0015] The cathode of the diode T19A is connected to the cathode of the diode T19B, the cathode of the diode T19B is connected to the ground via the resistor R78, the cathode of the diode T19B is also connected to the input end of the inverter N6D, the output end of the inverter N6D is connected to the base of the NPN transistor T20 via the resistor R76, the emitter of the NPN transistor T20 is grounded, the collector of the NPN transistor T20 is connected to the base of the PNP transistor T17 via the resistor R75, the base of the PNP transistor T17 is connected to the third DC voltage via the resistor R84, and the collector of the PNP transistor T17 is connected to the third DC voltage via the resistor R84. The resistor R85 is connected to ground, the collector of the PNP tube T17 is also connected to the anode of the diode D14, the cathode of the diode D14 and the emitter of the PNP tube T17 are connected to a third DC voltage, the anode of the diode D14 is also connected to the cathode of the voltage-stabilizing tube D52, the anode of the voltage-stabilizing tube D52 is grounded, the anode of the diode D14 is also connected to the first end of the resistor R7, and the second end of the resistor R7 is connected to the acquisition card as a zero point command signal output end, and the zero point command signal output end is used to connect to the proportional valve.

[0016] Preferably, the control card further includes a conditional instruction signal setting unit, which includes: a diode D18, a resistor R96, a voltage regulator tube D4, an adjustable resistor P3, a resistor R14, a resistor R113, a diode D2, a resistor R12, an adjustable resistor P2, a voltage regulator tube D3, a resistor R13, a resistor R114, a voltage regulator tube D20, a voltage regulator tube D19, a resistor R121, a resistor R15, an adjustable resistor P1, a resistor R117, an operational amplifier N10C, a resistor R120, a resistor R196 and a protection tube D43;

[0017] The anode of the diode D18 is connected to the output terminal of the operational amplifier N10A, the cathode of the diode D18 is connected to the cathode of the voltage regulator tube D4 via the resistor R96, the anode of the voltage regulator tube D4 is grounded, the cathode of the voltage regulator tube D4 is also connected to the second end of the adjustable resistor P3, the first end of the adjustable resistor P3 is connected to the ground via the resistor R14, and the adjustable end of the adjustable resistor P3 is connected to the first end of the resistor R113;

[0018] The cathode of the diode D2 is connected to the output terminal of the operational amplifier N10B, the anode of the diode D2 is connected to the second terminal of the adjustable resistor P2 via the resistor R12, the second terminal of the adjustable resistor P2 is connected to the anode of the voltage regulator diode D3, the cathode of the voltage regulator diode D3 is grounded, the first terminal of the adjustable resistor P2 is connected to ground via the resistor R13, and the adjustable terminal of the adjustable resistor P2 is connected to the first terminal of the resistor R114;

[0019] The second end of the resistor R114 is connected to the second end of the resistor R113 and the anode of the voltage-stabilizing tube D20, the cathode of the voltage-stabilizing tube D20 is connected to the cathode of the voltage-stabilizing tube D19, the second end of the resistor R114 is connected to the anode of the voltage-stabilizing tube D19 and the output end of the operational amplifier N10C via the resistor R121, the second end of the resistor R114 is connected to the adjustable end of the adjustable resistor P1 via the resistor R15, the first end of the adjustable resistor P1 is connected to the positive end of the first DC voltage, the second end of the resistor R114 is also connected to the second end of the resistor R117 and the inverting input end of the operational amplifier N10C, the first end of the resistor R117 is connected to the industrial computer, the non-inverting input end of the operational amplifier N10C is connected to the ground via the resistor R120, the output end of the operational amplifier N10C is connected to the first end of the resistor R196, the second end of the resistor R196 is connected to the ground via the protective tube D43, and the second end of the resistor R196 is connected to the acquisition card as the output end of the conditional command signal.

[0020] Preferably, the control card further includes a coil current signal processing unit, which includes: a switch control unit, a resistor R162, an NPN transistor T6, a resistor R161, a resistor R154, a resistor R164, a PNP transistor T8, an NPN transistor T9, a resistor R205, a voltage regulator D28, a PMOS transistor T2, an inductor L4, a diode D34, a capacitor C5, a resistor R173, an operational amplifier N16A, a resistor R183, a resistor R172, a resistor R181, a resistor R188, an NMOS transistor T3, a resistor R163, a resistor R174, a diode D35 and an inductor L3;

[0021] The switching signal output terminal of the switch control unit is connected to the base of the NPN transistor T6 via the resistor R162. The base of the NPN transistor T6 is also connected to the ground via the resistor R161. The emitter of the NPN transistor T6 is connected to the ground via the resistor R154. The collector of the NPN transistor T6 is connected to the third DC voltage via the resistor R164. The collector of the NPN transistor T6 is also connected to the base of the PNP transistor T8 and the base of the NPN transistor T9. The collector of the NPN transistor T9 is connected to the third DC voltage. The emitter of the NPN transistor T9 is connected to the PNP transistor T8. The emitter of the PNP transistor T8 is connected to the ground, the collector of the PNP transistor T8 is also connected to the anode of the voltage regulator tube D28 via the resistor R205, the anode of the voltage regulator tube D28 is connected to the gate of the PMOS transistor T2, the cathode of the voltage regulator tube D28 and the source of the PMOS transistor T2 are connected to a third DC voltage, the drain of the PMOS transistor T2 is connected to the first end of the inductor L4 and the cathode of the diode D34, the second end of the inductor L4 is connected to the ground via the capacitor C5, the second end of the inductor L4 is the first coil current signal output end and can be connected to the electromagnet coil of the pilot valve;

[0022] The anode of the diode D34 is connected to the inverting input terminal of the operational amplifier N16A via the resistor R173, and the anode of the diode D34 is also connected to the ground via the resistor R183. The inverting input terminal of the operational amplifier N16A is connected to the output terminal of the operational amplifier N16A via the resistor R172. The output terminal of the operational amplifier N16A is connected to the acquisition card as the error signal sampling terminal. The non-inverting input terminal of the operational amplifier N16A is connected to the ground via the resistor R181. The non-inverting input terminal of the operational amplifier N16A is also connected to the ground via the resistor R182. R188 is connected to the source of the NMOS transistor T3, the source of the NMOS transistor T3 is connected to the ground via the resistor R174, the gate of the NMOS transistor T3 is connected to the switch signal output end of the switch control unit via the resistor R163, the drain of the NMOS transistor T3 is connected to the anode of the diode D35, the cathode of the diode D35 is connected to the third DC voltage, the drain of the NMOS transistor T3 is also connected to the first end of the inductor L3, and the second end of the inductor L3 is the second coil current signal output end that can be connected to the electromagnet coil of the pilot valve.

[0023] Preferably, the control card further includes an oil motor feedback signal processing unit and an integrator output signal processing unit;

[0024] The hydraulic motor feedback signal processing unit is used to collect the voltage and current signals fed back by the proportional valve, and process the voltage and current signals to obtain current and voltage feedback signals;

[0025] The integrator output signal processing unit includes: an adjustable resistor P4, a resistor R25, a resistor R23, an operational amplifier N3A, a resistor R1, a resistor R40, a voltage regulator D2, a voltage regulator D1, a capacitor C6, a selection switch K2F, a diode D3 and a resistor R10;

[0026] The first end of the adjustable resistor P4 is connected to the oil motor feedback signal processing unit to receive the current and voltage feedback signals. The second end of the adjustable resistor P4 is connected to the ground via the resistor R25. The adjustable end of the adjustable resistor P4 is connected to the inverting input end of the operational amplifier N3A via the resistor R23. The inverting input end of the operational amplifier N3A is connected to the second end of the resistor R1. The second end of the resistor R1 is connected to the enabling unit in the control card. The non-inverting input end of the operational amplifier N3A is connected to the ground via the resistor R40. The inverting input end of the operational amplifier N3A is also connected to the anode of the voltage regulator tube D2, and the cathode of the voltage regulator tube D2. The cathode of the voltage regulator tube D1 is connected, the anode of the voltage regulator tube D1 is connected to the output end of the operational amplifier N3A, the anode of the voltage regulator tube D1 is used to connect to the enabling unit, the inverting input end of the operational amplifier N3A is connected to the output end of the operational amplifier N3A via the capacitor C6, the inverting input end of the operational amplifier N3A is also connected to the anode of the diode D3 via the selection switch K2F, the cathode of the diode D3 is connected to the output end of the operational amplifier N3A, the output end of the operational amplifier N3A is connected to the first end of the resistor R10, and the second end of the resistor R10 is connected to the acquisition card as the output end of the integrator output signal.

[0027] Preferably, the control card further comprises an oil motor feedback signal acquisition unit and / or a controller output signal processing unit;

[0028] The hydraulic motor feedback signal acquisition unit is connected to the hydraulic motor feedback signal processing unit and the acquisition card to filter the current and voltage feedback signals and then send them to the acquisition card;

[0029] The controller output signal processing unit is connected to the integrator output signal processing unit and the oil motor feedback signal processing unit to perform calculations based on the integrator output signal and the current and voltage feedback signals output by the integrator output signal processing unit to obtain the PID control output signal, and send the PID control output signal to the acquisition card.

[0030] Preferably, the control card further comprises two valve feedback signal processing units;

[0031] An input end of the valve feedback signal processing unit is connected to the acquisition card and can be connected to the pilot valve feedback signal output end of the proportional valve, and an output end of the valve feedback signal processing unit is connected to the industrial computer;

[0032] The input end of the other valve feedback signal processing unit is connected to the acquisition card and can be connected to the main valve feedback signal output end of the proportional valve, and the output end of the other valve feedback signal processing unit is connected to the industrial computer.

[0033] Preferably, each of the valve feedback signal processing units includes: a voltage regulator tube D51, a resistor R74, an operational amplifier N3A, a resistor R83, a resistor R41, a resistor R27, a resistor R28, an adjustable resistor P8, a resistor R26, an operational amplifier N3B, a resistor R58, a resistor R25 and a protection tube D42;

[0034] The cathode of the voltage regulator tube D51 is the input end of the valve feedback signal processing unit. The cathode of the voltage regulator tube D51 is connected to the inverting input end of the operational amplifier N3A via the resistor R74. The cathode of the voltage regulator tube D51 is also connected to the ground via the resistor R83. The anode of the voltage regulator tube D51 is grounded. The inverting input end of the operational amplifier N3A is connected to the output end of the operational amplifier N3A via the resistor R41. The non-inverting input end of the operational amplifier N3A is connected to the positive end of the first DC voltage via the resistor R27. The non-inverting input end of the operational amplifier N3A is also connected to the positive end of the first DC voltage via the resistor R27. The resistor R28 is connected to the first end of the adjustable resistor P8, the second end and the adjustable end of the adjustable resistor P8 are grounded, the output end of the operational amplifier N3A is connected to the inverting input end of the operational amplifier N3B via the resistor R26, the non-inverting input end of the operational amplifier N3B is grounded, the inverting input end of the operational amplifier N3B is also connected to the output end of the operational amplifier N3B via the resistor R58, the output end of the operational amplifier N3B is also connected to the first end of the resistor R25, and the second end of the resistor R25 is connected to the industrial computer as the output end of the valve feedback signal processing unit.

[0035] The present invention has at least the following beneficial effects: a steam turbine valve characteristic testing device is provided, comprising: a box body, and within the box body are arranged: a control card, an acquisition card, an acquisition interface and an industrial computer; relevant control instructions can be sent through the industrial computer, so that the control card controls the operation of the proportional valve; during the operation of the proportional valve, the acquisition card is used to collect feedback signals, control signals and oil pressure signals; finally, the industrial computer issues corresponding characteristic curves based on the feedback signals, control signals and oil pressure signals, so that the staff can comprehensively and intuitively monitor the operation of the proportional valve and diagnose faults; the device can not only predict the occurrence of faults in advance and prompt the fault personnel to take corresponding measures, but also replace the control system to control the proportional valve when the control system of the steam turbine valve is under maintenance, thereby improving the reliability of the steam turbine valve system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0037] Figure 1 It is a structural schematic diagram of the steam turbine valve characteristic testing device provided by the present invention;

[0038] Figure 2 It is a structural schematic diagram of a box in the steam turbine valve characteristic testing device provided by the present invention;

[0039] Figure 3 It is a structural diagram of a control card in the steam turbine valve characteristic testing device provided by the present invention;

[0040] Figure 4 This is a circuit diagram of a zero-point instruction signal processing unit provided by the present invention;

[0041] Figure 5 This is a circuit diagram of a feedforward input arithmetic unit provided by the present invention;

[0042] Figure 6 It is a circuit diagram of a conditional instruction signal setting unit provided by the present invention;

[0043] Figure 7 is a circuit diagram of a coil current signal processing unit provided by the present invention;

[0044] Figure 8 This is a circuit diagram of a switch control unit in a coil current signal processing unit provided by the present invention;

[0045] Figure 9 is a circuit diagram of an integrator output signal processing unit provided by the present invention;

[0046] Figure 10 This is a circuit diagram of the oil motor feedback signal processing unit provided by the present invention;

[0047] Figure 11 This is a circuit diagram of the oil motor feedback signal acquisition unit provided by the present invention;

[0048] Figure 12 This is a circuit diagram of the valve feedback signal processing unit provided by the present invention. DETAILED DESCRIPTION

[0049] 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.

[0050] In a certain nuclear power plant, the turbine valve system includes an oil motor for controlling the valve opening, a proportional valve for controlling the operation of the oil motor, and a control system for controlling the operation of the proportional valve.

[0051] refer to Figure 1 The present invention constructs a turbine valve characteristic testing device, which can replace the turbine valve control system to control the proportional valve, realize the control of the oil motor, and realize the characteristic test of the proportional valve. The turbine valve characteristic testing device includes a box body, and the box body is equipped with: a control card 1, an acquisition card 2, an acquisition interface 3 and an industrial computer 4.

[0052] Control card 1 is used to control the operation of the proportional valve. Specifically, control card 1 generates control instructions for the proportional valve based on control signals from the nuclear power plant's control system or industrial computer 4, combined with feedback signals from the proportional valve. Feedback signals include pilot valve feedback signals, main valve feedback signals, and hydraulic motor feedback signals. Control signals include coil current signals, zero-point command signals, conditional command signals, PID control signals, and integrator output signals.

[0053] The pilot valve feedback signal is used to reflect the pilot valve stroke position information in the proportional valve. The signal is sent to the control card 1 by the displacement sensor in the pilot valve.

[0054] The main valve feedback signal is used to reflect the main valve stroke position information in the proportional valve. The signal is sent to the control card 1 by the displacement sensor in the main valve.

[0055] The hydraulic motor feedback signal is used to reflect the stroke position information of the hydraulic motor. The signal is sent to the control card 1 by the displacement sensor in the hydraulic motor.

[0056] The coil current signal is used to drive the electromagnet in the pilot valve to control the pilot valve and further control the opening and closing of the main valve. The signal is sent by the control card 1 to the electromagnet in the pilot valve.

[0057] The zero-point command signal is a signal for controlling the stroke of the proportional valve generated after the input signal of the control system or the industrial computer 4 is processed (such as PID operation).

[0058] The conditional command signal is used to set the stroke position of the main valve. This signal participates in related calculations with the main valve feedback signal to control the generation of the coil current signal, thereby controlling the final stroke position of the main valve. In addition, the calculation of this signal is obtained by performing related calculations based on the zero-point command signal.

[0059] The PID control signal is the control signal output after the zero-point command signal participates in the PID operation. The conditional command signal can be obtained through the operation of the control signal.

[0060] The integrator output signal is the signal output after the zero-point command signal participates in the PID operation process and performs the integral operation.

[0061] Acquisition card 2 is connected to control card 1 and is used to collect feedback signals and control signals from control card 1. This allows industrial computer 4 to synchronously and accurately acquire these signals, accurately and faithfully reflecting the operating conditions of the proportional valve, thereby improving the accuracy of characteristic testing. The feedback signal includes at least one of a pilot valve feedback signal, a main valve feedback signal, and an oil motor feedback signal. The control signal includes at least one of a coil current signal, a zero command signal, a conditional command signal, a PID control signal, and an integrator output signal.

[0062] The acquisition interface 3 is connected to the acquisition card 2 and is also connected to the pressure sensor in the hydraulic motor to send the oil pressure signal to the acquisition card 2.

[0063] In some embodiments, the oil pressure signal includes the proportional valve inlet oil pressure signal, the oil pressure after the pressure reducing valve, the oil pressure signal of the pressure reducing valve A port, the oil pressure signal of the pressure reducing valve B port, and the oil pressure signals of several other locations (such as PT4 oil pressure signal, PT5 oil pressure signal, PT7 oil pressure signal, etc.).

[0064] Furthermore, the acquisition interface 3 includes several plugs, which are not only used to connect to the pressure sensor in the oil motor, but also to connect to the displacement sensors in the oil motor and the proportional valve respectively to receive feedback signals from the main valve, pilot valve and oil motor; these plugs also include four communication plugs.

[0065] Industrial computer 4 is connected to control card 1 and acquisition card 2, and is used to control the operation of control card 1 and process feedback signals, control signals, and oil pressure signals to generate corresponding characteristic curves. Correspondingly, the corresponding characteristic curves include at least one of a pilot valve feedback signal characteristic curve, a main valve feedback signal characteristic curve, an oil motor feedback signal characteristic curve, a coil current signal characteristic curve, a zero-point command signal characteristic curve, a conditional command signal characteristic curve, a PID control signal characteristic curve, and an integrator output signal characteristic curve. By observing the characteristic curves, a worker can determine whether the proportional valve is operating properly.

[0066] In some embodiments, as Figure 2 As shown, the box body is a flip-type box body 5, and an operation panel 51 for controlling the industrial computer 4 is also provided in the flip-type box body 5. The operation panel 51 can be operated after opening the flip cover of the flip-type box body 5; the operation panel 51 is provided with a selection switch unit 511 for controlling the on and off of the feedback signal, realizing the enabling function and setting the working mode.

[0067] In some embodiments, the selection switch unit 511 includes several selection switches; among them, some selection switches are connected in series between each feedback signal and the control card 1, so as to simulate the failure of the feedback signal through the selection switch; at least one selection switch is connected to the enable end of the controller output signal processing unit 17 in the control card 1, which is used to control whether the controller output signal processing unit 17 is enabled; and some selection switches are connected to the industrial computer 4 for selecting the working mode of the characteristic test.

[0068] Furthermore, the characteristic test includes four operating modes: Mode 1, simulating the GRE001 test at a stepwise variable rate of 21% / s; Mode 2, simulating the GRE001 test at a constant closing rate of 1.1% / s; Mode 3, simulating the GRE001 test at a closing rate of 8.9% / s above the 40% valve position and 1.5% / s below the 40% valve position; and Mode 4, simulating the GRE001 test at a constant closing rate of 3.3% / s. The GRE001 test process includes: controlling the proportional valve to close the regulating valve at a set closing rate. After the regulating valve is fully closed, the stop valve in the proportional valve is controlled to close. After the stop valve is fully closed, the regulating valve is controlled to open to 20% at a set opening rate. The regulating valve is then controlled to close at the set closing rate. The stop valve is then controlled to open. After the stop valve is fully opened, the regulating valve is controlled to open to the normal operating opening at the set opening rate. During the GRE001 test, industrial computer 4 generates the corresponding characteristic curve based on the relevant signals collected by acquisition card 2.

[0069] To facilitate wiring, in some embodiments, the plug in the acquisition interface 3 may be provided on the operation panel 51 , and the interface type may be an aviation plug.

[0070] In some embodiments, as Figure 2 As shown, the steam turbine valve characteristic testing device also includes a touch screen 6 arranged on the inner side of the flip cover of the flip-cover box 5. The touch screen 6 is connected to the industrial computer 4. The touch screen 6 is used to display the characteristic curves of the feedback signal, control signal and oil pressure signal in real time, and to obtain control instructions.

[0071] In order to improve portability, in some embodiments, a universal wheel 7 is provided at the bottom of the flip-top box, a telescopic rod 8 is provided on one side of the flip-top box 5, and a handle assembly (not shown) is provided on the outer side of the flip-top box 5.

[0072] In some embodiments, the steam turbine valve characteristic testing device also includes a power supply unit located on the inside of the operating panel 51, and the power supply is used to provide power to each unit in the device, including providing first, second, and third DC voltages; wherein, the first DC voltage can be ±10V, the positive end of the first DC voltage is 10V, and the negative end of the first DC voltage is -10V; the second DC voltage can be ±15V; and the third DC voltage can be 24V.

[0073] In some embodiments, as Figure 3 As shown, the control card 1 includes a zero-point instruction signal processing unit 11; further, as shown Figure 4 As shown, the zero-point instruction signal processing unit 11 includes: a resistor R124, a resistor R123, an operational amplifier N10B, a capacitor C43, a resistor R126, a resistor R125, a resistor R122, a voltage-stabilizing diode D15, a resistor R77, an inverter N6E, a diode T19A, an operational amplifier N10A, a capacitor C48, a resistor R111, a resistor R112, a resistor R110, a diode T19B, a resistor R78, an inverter N6D, a resistor R76, an NPN diode T20, a resistor R75, a PNP diode T17, a resistor R84, a diode D14, a resistor R85, a capacitor C49, a voltage-stabilizing diode D52 and a resistor R7;

[0074] Specifically, the second end of the resistor R124 is used to receive the zero control signal. The second end of the resistor R124 is also connected to the non-inverting input terminal of the operational amplifier N10B via the resistor R123. The non-inverting input terminal of the operational amplifier N10B is connected to the inverting input terminal of the operational amplifier N10B via the capacitor C43. The inverting input terminal of the operational amplifier N10B is connected to the ground via the resistor R126. The inverting input terminal of the operational amplifier N10B is also connected to the positive terminal of the first DC voltage via the resistor R125. The output terminal of the operational amplifier N10B is connected to the non-inverting input terminal of the operational amplifier N10B via the resistor R122. The output terminal of the operational amplifier N10B is also connected to the anode of the Zener diode D15. The cathode of the Zener diode D15 is connected to the second DC voltage via the resistor R77. The cathode of the Zener diode D15 is also connected to the input terminal of the inverter N6E. The output terminal of the inverter N6E is connected to the anode of the diode T19A.

[0075] A first end of resistor R124 is connected to a non-inverting input terminal of operational amplifier N10A. The non-inverting input terminal of operational amplifier N10A is further connected to an inverting input terminal of operational amplifier N10A via capacitor C48. The inverting input terminal of operational amplifier N10A is connected to a negative terminal of a first DC voltage via resistor R111. The inverting input terminal of operational amplifier N10A is further connected to ground via resistor R112. The non-inverting input terminal of operational amplifier N10A is connected to an output terminal of operational amplifier N10A via resistor R110. The output terminal of operational amplifier N10A is connected to an anode of diode T19B.

[0076] The cathode of diode T19A is connected to the cathode of diode T19B, the cathode of diode T19B is connected to ground via resistor R78, the cathode of diode T19B is also connected to the input end of inverter N6D, the output end of inverter N6D is connected to the base of NPN transistor T20 via resistor R76, the emitter of NPN transistor T20 is grounded, the collector of NPN transistor T20 is connected to the base of PNP transistor T17 via resistor R75, the base of PNP transistor T17 is connected to the third DC voltage via resistor R84, the collector of PNP transistor T17 is connected to ground via resistor R85, P The collector of the NP transistor T17 is also connected to the anode of the diode D14, the cathode of the diode D14 and the emitter of the PNP transistor T17 are connected to the third DC voltage, the anode of the diode D14 is connected to the ground via the capacitor C49, the anode of the diode D14 is also connected to the cathode of the voltage-stabilizing diode D52, the anode of the voltage-stabilizing diode D52 is grounded, the anode of the diode D14 is also connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the acquisition card 2 as the zero point command signal output end, and the zero point command signal output end is used to connect to the proportional valve.

[0077] In order to improve the sampling accuracy of the acquisition card 2, in some embodiments, the resistor R7 may be set to 100 ohms.

[0078] refer to Figure 4The working principle of the zero-point command signal processing unit 11 is as follows: the zero-point control signal enters the comparator composed of the operational amplifier N10B and the resistor R122 through the resistor R123. In this branch, when the feedforward output signal is greater than the voltage at the intersection of the resistor R125 and the resistor R126, the operational amplifier N10B outputs a high level. When passing through the inverter N6E, the signal will be inverted; the feedforward output signal enters the comparator composed of the operational amplifier N10B and the resistor R110 through the resistor R124. When the feedforward output signal is greater than the voltage at the intersection of the resistor R125 and the resistor R126, the operational amplifier N10B outputs a high level. When passing through the inverter N6E, the signal will be inverted. When the voltage at the intersection of R112 and resistor R111 is high, the operational amplifier N10A outputs a high level; the output voltages of the two paths will affect the cathode voltage of diode T19B. When the cathode voltage of diode T19B is low, the inverter N6D outputs a high level, turning on the NPN tube T20, and then turning on the PNP tube T17, and finally making the zero point command signal output end output a high level of a certain value under the action of the voltage regulator tube D52; conversely, when the cathode voltage of diode T19B is high, the zero point command signal output end outputs a low level.

[0079] In some embodiments, as Figure 5 As shown, the control card 1 also includes a feedforward input operation unit, the input end of the feedforward input operation unit is used to receive the feedforward output signal of the PID controller, and the output end of the feedforward input operation unit (corresponding to the output end of the operational amplifier N3D) is used to output the feedforward output signal to the zero-point command signal processing unit; in addition, Figure 5 When the enabling unit is enabled, it can be regarded as a closed switch.

[0080] In some embodiments, as Figure 3 and Figure 6 As shown, the control card 1 also includes a conditional command signal setting unit 12, which includes: a diode D18, a resistor R96, a voltage regulator tube D4, an adjustable resistor P3, a resistor R14, a resistor R113, a diode D2, a resistor R12, an adjustable resistor P2, a voltage regulator tube D3, a resistor R13, a resistor R114, a voltage regulator tube D20, a voltage regulator tube D19, a resistor R121, a resistor R15, an adjustable resistor P1, a resistor R117, an operational amplifier N10C, a resistor R120, a resistor R196 and a protection tube D43;

[0081] Specifically, the anode of the diode D18 is connected to the output terminal of the operational amplifier N10A, the cathode of the diode D18 is connected to the cathode of the voltage regulator tube D4 via the resistor R96, the anode of the voltage regulator tube D4 is grounded, the cathode of the voltage regulator tube D4 is also connected to the second end of the adjustable resistor P3, the first end of the adjustable resistor P3 is connected to the ground via the resistor R14, and the adjustable end of the adjustable resistor P3 is connected to the first end of the resistor R113;

[0082] The cathode of the diode D2 is connected to the output terminal of the operational amplifier N10B, the anode of the diode D2 is connected to the second terminal of the adjustable resistor P2 via the resistor R12, the second terminal of the adjustable resistor P2 is connected to the anode of the voltage regulator tube D3, the cathode of the voltage regulator tube D3 is grounded, the first terminal of the adjustable resistor P2 is connected to the ground via the resistor R13, and the adjustable terminal of the adjustable resistor P2 is connected to the first terminal of the resistor R114;

[0083] The second end of the resistor R114 is connected to the second end of the resistor R113 and the anode of the voltage regulator tube D20, the cathode of the voltage regulator tube D20 is connected to the cathode of the voltage regulator tube D19, the second end of the resistor R114 is connected to the anode of the voltage regulator tube D19 and the output end of the operational amplifier N10C via the resistor R121, the second end of the resistor R114 is connected to the adjustable end of the adjustable resistor P1 via the resistor R15, the first end of the adjustable resistor P1 is connected to the positive end of the first DC voltage, and the second end of the adjustable resistor P1 is connected to the negative end of the first DC voltage. The second end of the resistor R114 is also connected to the second end of the resistor R117 and the inverting input end of the operational amplifier N10C, the first end of the resistor R117 is connected to the industrial computer 4, the non-inverting input end of the operational amplifier N10C is connected to the ground via the resistor R120, the output end of the operational amplifier N10C is connected to the first end of the resistor R196, the second end of the resistor R196 is connected to the ground via the protective tube D43, and the second end of the resistor R196 is connected to the acquisition card 2 as the output end of the conditional command signal.

[0084] refer to Figure 6 The working principle of the conditional instruction signal setting unit 12 is as follows: the operational amplifier N10C, the resistor R121, the resistor R117 and the resistor R120 form an amplifier circuit, the output voltage of the amplifier circuit is related to the resistance ratio of the resistor R121 and the resistor R117, the voltage at the first end of the resistor 117 and the voltage at the inverting input terminal of the operational amplifier N10C; and the voltage at the inverting input terminal of the operational amplifier N10C is the output voltage of the adjustable resistor P1, the adjustable resistor P2, the adjustable resistor P3 and the operational amplifier N10A (the high level output of N10A will affect the resistor R96, the adjustable resistor P3, and the operational amplifier N10A composed of R14). The output voltage of the voltage-divider circuit at the adjustable end of the adjustable resistor P3) is related to the output voltage of the operational amplifier N10B (the high level output by N10B will affect the output voltage of the voltage-divider circuit composed of resistors R12, adjustable resistors P2, and R13 at the adjustable end of the adjustable resistor P2). Therefore, in this embodiment, the output voltage of the operational amplifier N10C can be controlled by adjusting the voltages of the adjustable resistors P1, P2, P3, and the first end of the resistor 117. In addition, the output end of the operational amplifier N10C is also connected to a related operational circuit (not shown, mainly used to participate in the generation operation of the coil current signal).

[0085] In some embodiments, as Figure 3 and Figure 7 As shown, the control card 1 also includes a coil current signal processing unit 13, which includes: a switch control unit, a resistor R162, an NPN transistor T6, a resistor R161, a resistor R154, a resistor R164, a PNP transistor T8, an NPN transistor T9, a resistor R205, a voltage regulator D28, a PMOS transistor T2, an inductor L4, a diode D34, a capacitor C5, a resistor R173, an operational amplifier N16A, a resistor R183, a resistor R172, a resistor R181, a resistor R188, an NMOS transistor T3, a resistor R163, a resistor R174, a diode D35, an inductor L3 and a capacitor C4;

[0086] Specifically, the switching signal output terminal of the switching control unit is connected to the base of the NPN tube T6 via the resistor R162, the base of the NPN tube T6 is further connected to the ground via the resistor R161, the emitter of the NPN tube T6 is connected to the ground via the resistor R154, the collector of the NPN tube T6 is connected to the third DC voltage via the resistor R164, the collector of the NPN tube T6 is also connected to the base of the PNP tube T8 and the base of the NPN tube T9, the collector of the NPN tube T9 is connected to the third DC voltage, and the emitter of the NPN tube T9 is connected to the emitter of the PNP tube T8. The emitter and collector of the PNP transistor T8 are grounded. The emitter of the PNP transistor T8 is also connected to the anode of the voltage regulator transistor D28 via the resistor R205. The anode of the voltage regulator transistor D28 is connected to the gate of the PMOS transistor T2. The cathode of the voltage regulator transistor D28 and the source of the PMOS transistor T2 are connected to a third DC voltage. The drain of the PMOS transistor T2 is connected to the first end of the inductor L4 and the cathode of the diode D34. The second end of the inductor L4 is connected to the ground via the capacitor C5. The second end of the inductor L4 is the first coil current signal output end and can be connected to the electromagnet coil of the pilot valve.

[0087] The anode of the diode D34 is connected to the inverting input terminal of the operational amplifier N16A via the resistor R173. The anode of the diode D34 is also connected to the ground via the resistor R183. The inverting input terminal of the operational amplifier N16A is connected to the output terminal of the operational amplifier N16A via the resistor R172. The output terminal of the operational amplifier N16A is connected to the acquisition card 2 as the error signal sampling terminal. The non-inverting input terminal of the operational amplifier N16A is connected to the ground via the resistor R181. The non-inverting input terminal of the operational amplifier N16A is also connected to N The source of the MOS transistor T3 and the source of the NMOS transistor T3 are connected to ground via a resistor R174. The gate of the NMOS transistor T3 is connected to the switch signal output terminal of the switch control unit via a resistor R163. The drain of the NMOS transistor T3 is connected to the anode of the diode D35. The cathode of the diode D35 is connected to the third DC voltage. The drain of the NMOS transistor T3 is also connected to the first end of the inductor L3. The second end of the inductor L3 is connected to ground via a capacitor C4. The second end of the inductor L3 is the second coil current signal output terminal and can be connected to the electromagnet coil of the pilot valve.

[0088] In some embodiments, the circuit diagram of the switch control unit can refer to Figure 8 , where the coil control instruction is obtained by performing relevant operations based on the valve feedback signal (including the pilot valve feedback signal and the main valve feedback signal) and the conditional instruction signal; the 10th pin of the switching power supply chip N13 is the switching signal output end of the switching control unit.

[0089] refer to Figure 7 The working principle of the coil current signal processing unit 13 is as follows: When the switching signal output by the switch control unit is at a high level: one path of the switching signal is input to the base of the NPN transistor T6 via the resistor 162, turning on the NPN transistor T6, thereby turning on the PNP transistor T8 and the NPN transistor T9, and further turning on the PMOS transistor T2; another path of the switching signal is input to the gate of the NMOS transistor T3 via the resistor 163, turning on the NMOS transistor T3, and ultimately forming a loop through the PMOS transistor T2, the inductor L4, the electromagnet coil of the pilot valve, the inductor L3, the NMOS transistor T3, and the resistor R174, thereby exciting the electromagnet coil of the pilot valve and starting the pilot valve to operate.

[0090] In some embodiments, as Figure 3 As shown, the control card 1 also includes an oil motor feedback signal processing unit 14 and an integrator output signal processing unit 15; the oil motor feedback signal processing unit 14 is used to collect the voltage and current signals fed back by the proportional valve, and process the voltage and current signals to obtain current and voltage feedback signals.

[0091] In some embodiments, as Figure 9 As shown, the integrator output signal processing unit 15 includes: an adjustable resistor P4, a resistor R25, a resistor R23, an operational amplifier N3A, a resistor R1, a resistor R40, a voltage regulator tube D2, a voltage regulator tube D1, a capacitor C6, a selection switch K2F, a diode D3 and a resistor R10;

[0092] Specifically, the first end of the adjustable resistor P4 is connected to the oil motor feedback signal processing unit 14 to receive the current and voltage feedback signals, the second end of the adjustable resistor P4 is connected to the ground via the resistor R25, the adjustable end of the adjustable resistor P4 is connected to the inverting input end of the operational amplifier N3A via the resistor R23, the inverting input end of the operational amplifier N3A is connected to the second end of the resistor R1, the second end of the resistor R1 is used to connect to the enabling unit in the control card 1, the non-inverting input end of the operational amplifier N3A is connected to the ground via the resistor R40, and the inverting input end of the operational amplifier N3A is also connected to the anode of the voltage regulator tube D2. The cathode of 2 is connected to the cathode of the voltage regulator tube D1, the anode of the voltage regulator tube D1 is connected to the output terminal of the operational amplifier N3A, the anode of the voltage regulator tube D1 is used to connect to the enabling unit, the inverting input terminal of the operational amplifier N3A is connected to the output terminal of the operational amplifier N3A via the capacitor C6, the inverting input terminal of the operational amplifier N3A is also connected to the anode of the diode D3 via the selection switch K2F, the cathode of the diode D3 is connected to the output terminal of the operational amplifier N3A, the output terminal of the operational amplifier N3A is connected to the first end of the resistor R10, and the second end of the resistor R10 serves as the output terminal of the integrator output signal and is connected to the acquisition card 2. When the enabling unit performs the enabling operation, it is equivalent to short-circuiting the second end of the resistor R1 and the output terminal of the operational amplifier N3A.

[0093] In order to improve the sampling accuracy of the acquisition card 2 , in some embodiments, the resistor R10 may be set to 100 ohms.

[0094] refer to Figure 9 The working principle of the integrator output signal processing unit 15 is as follows: after the current and voltage feedback signals are divided by the adjustable resistor P4 and the resistor R25, they are input to the inverting input terminal of the operational amplifier N3A through the resistor R23. When the enabling unit is activated, the operational amplifier N3A, the resistor R1, and the resistor R23 form an amplification circuit to amplify the divided current and voltage feedback signals. Finally, the amplified signal is output from the output terminal of the operational amplifier N3A, participates in the PID operation (not shown), and is input to the acquisition card 2 through the resistor R10.

[0095] In some embodiments, the circuit diagram of the hydraulic motor feedback signal processing unit 14 can be referred to Figure 10 , wherein the voltage feedback signal and the current feedback signal come from the voltage feedback signal and the current feedback signal output by the valve displacement sensor of the oil motor respectively.

[0096] In some embodiments, as Figure 3 As shown, the control card 1 further includes an oil motor feedback signal acquisition unit 16 and / or a controller output signal processing unit 17;

[0097] Specifically, the hydraulic motor feedback signal acquisition unit 16 is connected to the hydraulic motor feedback signal processing unit 14 and the acquisition card 2 to filter the current and voltage feedback signals and send them to the acquisition card 2. The controller output signal processing unit 17 is connected to the integrator output signal processing unit 15 and the hydraulic motor feedback signal processing unit 14 to perform calculations based on the integrator output signal output by the integrator output signal processing unit 15 and the current and voltage feedback signals to obtain a PID control output signal, and then send the PID control output signal to the acquisition card 2. In addition, the controller output signal processing unit 17 and the integrator output signal processing unit 15 together constitute a PID calculation circuit. The PID control output signal will ultimately be calculated with the feedforward output signal to obtain a zero-point control signal, which will then participate in the calculation of the zero-point command signal.

[0098] In some embodiments, the circuit diagram of the oil motor feedback signal acquisition unit 16 can be referred to Figure 11 .

[0099] In some embodiments, such as Figure 3 As shown, the control card 1 also includes two valve feedback signal processing units (respectively, a valve feedback signal processing unit 18a and a valve feedback signal processing unit 18b); specifically, the input end of one valve feedback signal processing unit 18a is connected to the acquisition card 2 and the pilot valve feedback signal output end that can be connected to the proportional valve, and the output end of the valve feedback signal processing unit 18a is connected to the industrial computer 4; the input end of the other valve feedback signal processing unit 18b is connected to the acquisition card 2 and the main valve feedback signal output end that can be connected to the proportional valve, and the output end of the other valve feedback signal processing unit 18b is connected to the industrial computer 4.

[0100] In some embodiments, as Figure 12 As shown, each valve feedback signal processing unit includes: a voltage regulator tube D51, a resistor R74, an operational amplifier N3A, a resistor R83, a resistor R41, a resistor R27, a resistor R28, an adjustable resistor P8, a resistor R26, an operational amplifier N3B, a resistor R58, a resistor R25 and a protection tube D42;

[0101] Specifically, the cathode of the voltage regulator tube D51 is the input end of the valve feedback signal processing unit, the cathode of the voltage regulator tube D51 is connected to the inverting input end of the operational amplifier N3A via the resistor R74, the cathode of the voltage regulator tube D51 is also connected to the ground via the resistor R83, the anode of the voltage regulator tube D51 is grounded, the inverting input end of the operational amplifier N3A is connected to the output end of the operational amplifier N3A via the resistor R41, the non-inverting input end of the operational amplifier N3A is connected to the positive end of the first DC voltage via the resistor R27, and the non-inverting input end of the operational amplifier N3A is also connected to the positive end of the first DC voltage via the resistor R27. R28 is connected to the first end of the adjustable resistor P8, the second end and the adjustable end of the adjustable resistor P8 are grounded, the output end of the operational amplifier N3A is connected to the inverting input end of the operational amplifier N3B via the resistor R26, the non-inverting input end of the operational amplifier N3B is grounded, the inverting input end of the operational amplifier N3B is also connected to the output end of the operational amplifier N3B via the resistor R58, the output end of the operational amplifier N3B is also connected to the first end of the resistor R25, and the second end of the resistor R25 is connected to the industrial computer 4 as the output end of the valve feedback signal processing unit.

[0102] refer to Figure 12 The working principle of the valve feedback signal processing unit is as follows: the input end of the valve feedback signal processing unit is used to receive the signal output by the displacement sensor of the main valve or the pilot valve, and the resistor R74, the operational amplifier N3A, the resistor R83, the resistor R41, the resistor R27, the resistor R28 and the adjustable resistor P8 form a first-stage amplifier circuit, which amplifies the output signal of the displacement sensor. The amplified signal is input to the inverting input end of the operational amplifier N3B through the resistor R26, and the operational amplifier N3B, the resistor R26 and the resistor R58 form a second-stage amplifier circuit to amplify the signal again. The output end of the operational amplifier N3B outputs the final valve feedback signal to the industrial computer 4 through the resistor 25. At the same time, the valve feedback signal also participates in the operation of the coil control instruction with the conditional instruction signal (not shown).

[0103] The present invention has at least the following beneficial effects: a steam turbine valve characteristic testing device is provided, comprising: a box body, and within the box body are arranged: a control card, an acquisition card, an acquisition interface and an industrial computer; relevant control instructions can be sent through the industrial computer, so that the control card controls the operation of the proportional valve; during the operation of the proportional valve, the acquisition card is used to collect feedback signals, control signals and oil pressure signals; finally, the industrial computer issues corresponding characteristic curves based on the feedback signals, control signals and oil pressure signals, so that the staff can comprehensively and intuitively monitor the operation of the proportional valve and diagnose faults; the device can not only predict the occurrence of faults in advance and prompt the fault personnel to take corresponding measures, but also replace the control system to control the proportional valve when the control system of the steam turbine valve is under maintenance, thereby improving the reliability of the steam turbine valve system.

[0104] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A steam turbine valve characteristic testing device, characterized in that: It comprises a box body, and inside the box are arranged: a control card (1), an acquisition card (2), an acquisition interface (3) and an industrial control computer (4); The control card (1) is used to control the operation of the proportional valve; The acquisition card (2) is connected to the control card (1) and is used to acquire feedback signals and control signals from the control card (1); wherein the feedback signal includes at least one of a pilot valve feedback signal, a main valve feedback signal, and an oil motor feedback signal; and the control signal includes at least one of a coil current signal, a zero point command signal, a conditional command signal, a PID control signal, and an integrator output signal; The acquisition interface (3) is connected to the acquisition card (2) and is also connected to a pressure sensor in the oil motor to send the oil pressure signal to the acquisition card (2); The industrial computer (4) is connected to the control card (1) and the acquisition card (2) and is used to control the operation of the control card (1) and process the feedback signal, control signal and oil pressure signal to generate a corresponding characteristic curve.

2. The steam turbine valve characteristic testing device according to claim 1, characterized in that: The box body is a flip-top box body (5), and an operation panel (51) for controlling the industrial computer (4) is also provided in the flip-top box body (5); The operation panel (51) is provided with a selection switch unit (511) for controlling the on / off of the feedback signal, realizing an enabling function, and setting an operating mode.

3. The steam turbine valve characteristic testing device according to claim 2, characterized in that: The invention also includes a touch screen (6) provided on the inner side of the flip cover of the flip-cover box (5), wherein the touch screen (6) is connected to the industrial computer (4), and the touch screen (6) is used to display the characteristic curves of the feedback signal, the control signal and the oil pressure signal in real time, and to obtain control instructions.

4. The steam turbine valve characteristic testing device according to claim 1, characterized in that: The control card (1) includes a zero-point instruction signal processing unit (11), which includes: a resistor R124, a resistor R123, an operational amplifier N10B, a resistor R126, a resistor R125, a resistor R122, a voltage regulator D15, a resistor R77, an inverter N6E, a diode T19A, an operational amplifier N10A, a resistor R111, a resistor R112, a resistor R110, a diode T19B, a resistor R78, an inverter N6D, a resistor R76, an NPN transistor T20, a resistor R75, a PNP transistor T17, a resistor R84, a diode D14, a resistor R85, a voltage regulator D52 and a resistor R7; The second end of the resistor R124 is used to receive a zero control signal. The second end of the resistor R124 is also connected to the non-inverting input of the operational amplifier N10B via the resistor R123. The inverting input of the operational amplifier N10B is connected to ground via the resistor R126. The inverting input of the operational amplifier N10B is also connected to the positive end of the first DC voltage via the resistor R125. The output of the operational amplifier N10B is connected to the non-inverting input of the operational amplifier N10B via the resistor R122. The output of the operational amplifier N10B is also connected to the anode of the voltage regulator tube D15. The cathode of the voltage regulator tube D15 is connected to the second DC voltage via the resistor R77. The cathode of the voltage regulator tube D15 is also connected to the input of the inverter N6E. The output of the inverter N6E is connected to the anode of the diode T19A. A first end of the resistor R124 is connected to the non-inverting input of the operational amplifier N10A, an inverting input of the operational amplifier N10A is connected to the negative terminal of the first DC voltage via the resistor R111, the inverting input of the operational amplifier N10A is further connected to ground via the resistor R112, a non-inverting input of the operational amplifier N10A is connected to the output of the operational amplifier N10A via the resistor R110, and the output of the operational amplifier N10A is connected to the anode of the diode T19B; The cathode of the diode T19A is connected to the cathode of the diode T19B, the cathode of the diode T19B is connected to the ground via the resistor R78, the cathode of the diode T19B is also connected to the input end of the inverter N6D, the output end of the inverter N6D is connected to the base of the NPN transistor T20 via the resistor R76, the emitter of the NPN transistor T20 is grounded, the collector of the NPN transistor T20 is connected to the base of the PNP transistor T17 via the resistor R75, the base of the PNP transistor T17 is connected to the third DC voltage via the resistor R84, and the collector of the PNP transistor T17 is connected to the third DC voltage via the resistor R84. The resistor R85 is connected to the ground, the collector of the PNP tube T17 is also connected to the anode of the diode D14, the cathode of the diode D14 and the emitter of the PNP tube T17 are connected to a third DC voltage, the anode of the diode D14 is also connected to the cathode of the voltage regulator tube D52, the anode of the voltage regulator tube D52 is grounded, the anode of the diode D14 is also connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the acquisition card (2) as the zero point command signal output end, and the zero point command signal output end is used to connect the proportional valve.

5. The steam turbine valve characteristic testing device according to claim 4, characterized in that: The control card (1) further includes a conditional instruction signal setting unit (12), which includes: a diode D18, a resistor R96, a voltage regulator tube D4, an adjustable resistor P3, a resistor R14, a resistor R113, a diode D2, a resistor R12, an adjustable resistor P2, a voltage regulator tube D3, a resistor R13, a resistor R114, a voltage regulator tube D20, a voltage regulator tube D19, a resistor R121, a resistor R15, an adjustable resistor P1, a resistor R117, an operational amplifier N10C, a resistor R120, a resistor R196 and a protection tube D43; The anode of the diode D18 is connected to the output terminal of the operational amplifier N10A, the cathode of the diode D18 is connected to the cathode of the voltage regulator tube D4 via the resistor R96, the anode of the voltage regulator tube D4 is grounded, the cathode of the voltage regulator tube D4 is also connected to the second end of the adjustable resistor P3, the first end of the adjustable resistor P3 is connected to the ground via the resistor R14, and the adjustable end of the adjustable resistor P3 is connected to the first end of the resistor R113; The cathode of the diode D2 is connected to the output terminal of the operational amplifier N10B, the anode of the diode D2 is connected to the second terminal of the adjustable resistor P2 via the resistor R12, the second terminal of the adjustable resistor P2 is connected to the anode of the voltage regulator diode D3, the cathode of the voltage regulator diode D3 is grounded, the first terminal of the adjustable resistor P2 is connected to ground via the resistor R13, and the adjustable terminal of the adjustable resistor P2 is connected to the first terminal of the resistor R114; The second end of the resistor R114 is connected to the second end of the resistor R113 and the anode of the voltage regulator tube D20, the cathode of the voltage regulator tube D20 is connected to the cathode of the voltage regulator tube D19, the second end of the resistor R114 is connected to the anode of the voltage regulator tube D19 and the output end of the operational amplifier N10C via the resistor R121, the second end of the resistor R114 is connected to the adjustable end of the adjustable resistor P1 via the resistor R15, the first end of the adjustable resistor P1 is connected to the positive end of the first DC voltage, and the resistor R114 The second end of the resistor R117 is also connected to the second end of the resistor R117 and the inverting input end of the operational amplifier N10C. The first end of the resistor R117 is connected to the industrial computer (4). The non-inverting input end of the operational amplifier N10C is connected to the ground via the resistor R120. The output end of the operational amplifier N10C is connected to the first end of the resistor R196. The second end of the resistor R196 is connected to the ground via the protective tube D43. The second end of the resistor R196 is connected to the acquisition card (2) as the output end of the conditional instruction signal.

6. The steam turbine valve characteristic testing device according to claim 3, characterized in that: The control card (1) further includes a coil current signal processing unit (13), which includes: a switch control unit, a resistor R162, an NPN transistor T6, a resistor R161, a resistor R154, a resistor R164, a PNP transistor T8, an NPN transistor T9, a resistor R205, a voltage regulator D28, a PMOS transistor T2, an inductor L4, a diode D34, a capacitor C5, a resistor R173, an operational amplifier N16A, a resistor R183, a resistor R172, a resistor R181, a resistor R188, an NMOS transistor T3, a resistor R163, a resistor R174, a diode D35 and an inductor L3; The switching signal output terminal of the switch control unit is connected to the base of the NPN transistor T6 via the resistor R162. The base of the NPN transistor T6 is also connected to the ground via the resistor R161. The emitter of the NPN transistor T6 is connected to the ground via the resistor R154. The collector of the NPN transistor T6 is connected to the third DC voltage via the resistor R164. The collector of the NPN transistor T6 is also connected to the base of the PNP transistor T8 and the base of the NPN transistor T9. The collector of the NPN transistor T9 is connected to the third DC voltage. The emitter of the NPN transistor T9 is connected to the PNP transistor T8. The emitter of the PNP transistor T8 is connected to the ground, the collector of the PNP transistor T8 is also connected to the anode of the voltage regulator tube D28 via the resistor R205, the anode of the voltage regulator tube D28 is connected to the gate of the PMOS transistor T2, the cathode of the voltage regulator tube D28 and the source of the PMOS transistor T2 are connected to a third DC voltage, the drain of the PMOS transistor T2 is connected to the first end of the inductor L4 and the cathode of the diode D34, the second end of the inductor L4 is connected to the ground via the capacitor C5, the second end of the inductor L4 is the first coil current signal output end and can be connected to the electromagnet coil of the pilot valve; The anode of the diode D34 is connected to the inverting input terminal of the operational amplifier N16A via the resistor R173, and the anode of the diode D34 is also connected to the ground via the resistor R183. The inverting input terminal of the operational amplifier N16A is connected to the output terminal of the operational amplifier N16A via the resistor R172. The output terminal of the operational amplifier N16A is connected to the acquisition card (2) as the error signal sampling terminal. The non-inverting input terminal of the operational amplifier N16A is connected to the ground via the resistor R181. The non-inverting input terminal of the operational amplifier N16A is also connected to the ground via the resistor R183. Resistor R188 is connected to the source of the NMOS transistor T3, the source of the NMOS transistor T3 is connected to the ground via the resistor R174, the gate of the NMOS transistor T3 is connected to the switch signal output end of the switch control unit via the resistor R163, the drain of the NMOS transistor T3 is connected to the anode of the diode D35, the cathode of the diode D35 is connected to the third DC voltage, the drain of the NMOS transistor T3 is also connected to the first end of the inductor L3, and the second end of the inductor L3 is the second coil current signal output end that can be connected to the electromagnet coil of the pilot valve.

7. The steam turbine valve characteristic testing device according to any one of claims 1 or 6, characterized in that: The control card (1) further includes an oil motor feedback signal processing unit (14) and an integrator output signal processing unit (15); The oil motor feedback signal processing unit (14) is used to collect the voltage and current signals fed back by the proportional valve, and process the voltage and current signals to obtain current and voltage feedback signals; The integrator output signal processing unit (15) includes: an adjustable resistor P4, a resistor R25, a resistor R23, an operational amplifier N3A, a resistor R1, a resistor R40, a voltage regulator D2, a voltage regulator D1, a capacitor C6, a selection switch K2F, a diode D3 and a resistor R10; The first end of the adjustable resistor P4 is connected to the oil motor feedback signal processing unit (14) to receive the current and voltage feedback signals, the second end of the adjustable resistor P4 is connected to the ground via the resistor R25, the adjustable end of the adjustable resistor P4 is connected to the inverting input end of the operational amplifier N3A via the resistor R23, the inverting input end of the operational amplifier N3A is connected to the second end of the resistor R1, the second end of the resistor R1 is connected to the enabling unit in the control card (1), the non-inverting input end of the operational amplifier N3A is connected to the ground via the resistor R40, the inverting input end of the operational amplifier N3A is also connected to the anode of the voltage regulator tube D2, and the voltage regulator tube D2 The cathode is connected to the cathode of the voltage regulator tube D1, the anode of the voltage regulator tube D1 is connected to the output end of the operational amplifier N3A, the anode of the voltage regulator tube D1 is used to connect to the enabling unit, the inverting input end of the operational amplifier N3A is connected to the output end of the operational amplifier N3A via the capacitor C6, the inverting input end of the operational amplifier N3A is also connected to the anode of the diode D3 via the selection switch K2F, the cathode of the diode D3 is connected to the output end of the operational amplifier N3A, the output end of the operational amplifier N3A is connected to the first end of the resistor R10, and the second end of the resistor R10 is connected to the acquisition card (2) as the output end of the integrator output signal.

8. The steam turbine valve characteristic testing device according to claim 7, characterized in that: The control card (1) further includes an oil motor feedback signal acquisition unit (16) and / or a controller output signal processing unit (17); The hydraulic motor feedback signal acquisition unit (16) is connected to the hydraulic motor feedback signal processing unit (14) and the acquisition card (2) to filter the current and voltage feedback signals and then send them to the acquisition card (2); The controller output signal processing unit (17) is connected to the integrator output signal processing unit (15) and the oil motor feedback signal processing unit (14) to perform calculations based on the integrator output signal output by the integrator output signal processing unit (15) and the current and voltage feedback signals to obtain a PID control output signal, and transmit the PID control output signal to the acquisition card (2).

9. The steam turbine valve characteristic testing device according to claim 7, characterized in that: The control card (1) further comprises two valve feedback signal processing units; The input end of the valve feedback signal processing unit is connected to the acquisition card (2) and can be connected to the pilot valve feedback signal output end of the proportional valve, and the output end of the valve feedback signal processing unit is connected to the industrial computer (4); The input end of the other valve feedback signal processing unit is connected to the acquisition card (2) and can be connected to the main valve feedback signal output end of the proportional valve, and the output end of the other valve feedback signal processing unit is connected to the industrial computer (4).

10. The steam turbine valve characteristic testing device according to claim 9, characterized in that: Each of the valve feedback signal processing units includes: a voltage regulator tube D51, a resistor R74, an operational amplifier N3A, a resistor R83, a resistor R41, a resistor R27, a resistor R28, an adjustable resistor P8, a resistor R26, an operational amplifier N3B, a resistor R58, a resistor R25 and a protection tube D42; The cathode of the voltage regulator tube D51 is the input end of the valve feedback signal processing unit. The cathode of the voltage regulator tube D51 is connected to the inverting input end of the operational amplifier N3A via the resistor R74. The cathode of the voltage regulator tube D51 is also connected to the ground via the resistor R83. The anode of the voltage regulator tube D51 is grounded. The inverting input end of the operational amplifier N3A is connected to the output end of the operational amplifier N3A via the resistor R41. The non-inverting input end of the operational amplifier N3A is connected to the positive end of the first DC voltage via the resistor R27. The non-inverting input end of the operational amplifier N3A is also connected to the positive end of the first DC voltage via the resistor R27. R28 is connected to the first end of the adjustable resistor P8, the second end and the adjustable end of the adjustable resistor P8 are grounded, the output end of the operational amplifier N3A is connected to the inverting input end of the operational amplifier N3B via the resistor R26, the non-inverting input end of the operational amplifier N3B is grounded, the inverting input end of the operational amplifier N3B is also connected to the output end of the operational amplifier N3B via the resistor R58, the output end of the operational amplifier N3B is also connected to the first end of the resistor R25, and the second end of the resistor R25 is connected to the industrial computer (4) as the output end of the valve feedback signal processing unit.

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