Sensor verification device of steam turbine monitoring protection instrument

Abstract

The utility model discloses a sensor verification device of a steam turbine monitoring protection instrument. The sensor verification device comprises an operation unit, a control and feedback circuit, an acquisition circuit and an execution mechanism. The output end of the control and feedback circuit is connected with the execution mechanism, and the control and feedback circuit controls operation of the execution mechanism. The input end of the acquisition circuit is connected with the sensor; the sensor detects the change of the execution mechanism and converts the change into a measurement signal, the sensor outputs the measurement signal to the acquisition circuit, and the acquisition circuit acquires and processes the measurement signal; the arithmetic unit is connected with the control and feedback circuit and the acquisition circuit, and the arithmetic unit sends a control instruction to the control and feedback circuit and receives a measurement signal processed by the acquisition circuit. According to the utility model, the functions are comprehensive, the measurement of various sensor signals of the TSI can be realized, and a user does not need to combine by himself / herself; and execution and sampling are integrated to form a closed loop of an inspection process, so that complexity and errors of manual operation are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a check technical field, especially a kind of sensor check device of turbine supervisory protection instrument. BACKGROUND

[0002] Turbine supervisory protection instrument (Turbine Supervisory Instruments, referred to as TSI instrument) is one of the key equipment to ensure the safe operation of rotating machinery.TSI instrument needs to monitor and protect many parameter signal types, commonly used measurement physical parameters include: vibration, axial displacement, expansion difference, eccentricity, speed, cylinder expansion, stroke and so on, corresponding sensor includes eddy current sensor, direct current type LVDT sensor, magneto-electric sensor, piezoelectric sensor and so on.In prior art, the following two ways are usually adopted to check sensor: one, using vernier caliper, multimeter, frequency measuring instrument and other general equipment to manually detect, manually record data and analyze, but operation is tedious, and precision is poor.Two, some manufacturers design test device for specific sensor, but function is less, and applicable sensor types are less, and user often needs to purchase multiple devices, and use cost and learning cost are high. SUMMARY

[0003] According to the utility model embodiments, a kind of sensor check device of turbine supervisory protection instrument is provided, include: operation unit, control and feedback circuit, acquisition circuit and actuating mechanism;

[0004] The output end of control and feedback circuit is connected with actuating mechanism, and control and feedback circuit controls the operation of actuating mechanism;

[0005] The input end of acquisition circuit is connected with sensor;

[0006] Sensor detects the change of actuating mechanism and is converted into measurement signal, and sensor outputs measurement signal to acquisition circuit, and acquisition circuit collects and processes measurement signal;

[0007] Operation unit is connected with control and feedback circuit and acquisition circuit, and operation unit sends control instruction to control and feedback circuit, and receives measurement signal after processing by acquisition circuit.

[0008] Further, control and feedback circuit is equipped with motor control output interface, encoder input interface, oscillation circuit output interface, switching value input interface and switching value output interface.

[0009] Further, it further include: USB interface and RS485 interface, and operation unit is communicated with computer by USB interface, and operation unit is communicated with third party equipment by RS485 interface.

[0010] Further, the execution mechanism comprises a stepper motor, a screw rod, a sliding table and a grating ruler.

[0011] Further, the execution mechanism comprises a stepper motor, a screw rod, a sliding table and a grating ruler.

[0012] The stepper motor is connected with the control and feedback circuit and the screw rod, and the sliding table is threadedly connected on the screw rod.

[0013] The stepper motor receives the driving signal output by the control and feedback circuit, drives the screw rod to rotate, and drives the sliding table to slide along the screw rod.

[0014] The grating ruler comprises a scale grating and a reading head, the reading head is connected with the sliding table, the scale grating is parallel with the screw rod, the grating ruler is connected with the control and feedback circuit, and the output signal is output to the control and feedback circuit.

[0015] The target plate is arranged on the sliding table, and the target plate is arranged opposite to the sensor.

[0016] Further, limit switches are arranged at two ends of the screw rod, and the limit switches are connected with the control and feedback circuit.

[0017] Further, the execution mechanism comprises an electric mode modal exciter, and the electric mode modal exciter is connected with the control and feedback circuit.

[0018] Further, the execution mechanism comprises a servo controller, a servo motor and a gear piece.

[0019] The servo controller is connected with the servo motor and the control and feedback circuit, and the servo motor is connected with the gear piece.

[0020] The control and feedback circuit controls the servo motor to operate through the servo controller, and drives the gear piece to rotate.

[0021] The sensor calibration device for the turbine monitoring and protection instrument according to the embodiment of the utility model, function is comprehensive, can realize the measurement of TSI various sensor signal, need not user to combine personally, execution and sampling integration, form the closed loop of inspection process, reduce the tediousness and error of manual operation.

[0022] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the subject technology claimed. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the subject technology claimed.

[0024] Figure 2 It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the subject technology claimed.

[0025] Figure 3 Figure 2 is an embodiment two schematic diagram of a sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application;

[0026] Figure 4 Figure 3 is an embodiment three schematic diagram of a sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application;

[0027] Figure 5 Figure 4 is a control and feedback circuit schematic diagram of a sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, and the present application will be further described.

[0029] Firstly, the sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application will be described in combination with Figures 1-5 The sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application is used for calibrating sensors, and has a wide application scenario.

[0030] As shown in Figures 1-5 The sensor calibration device of a turbine monitoring and protection instrument according to the embodiment of the present application comprises: an operation unit 1, a control and feedback circuit 2, an acquisition circuit 3 and an execution mechanism 4.

[0031] Specifically, as shown in Figures 1-5As shown, in this embodiment, the output of the control and feedback circuit 2 is connected to the actuator 4, and the control and feedback circuit 2 controls the operation of the actuator 4; the input of the acquisition circuit 3 is connected to the sensor 5; the sensor 5 detects changes in the actuator 4 and converts them into measurement signals, and the sensor 5 outputs measurement signals to the acquisition circuit 3, which acquires and processes the measurement signals. The acquisition circuit 3 uses existing technology; the arithmetic unit 1 is composed of a CPU chip, and the arithmetic unit 1 is connected to the control and feedback circuit 2 and the acquisition circuit 3. The arithmetic unit 1 sends control commands to the control and feedback circuit 2 and receives the measurement signals processed by the acquisition circuit 3. Through a set of control and feedback circuits 2, servo motor control, stepper motor control, relay control, oscillation signal output, and feedback of grating ruler and motor stepping signals can be realized. Through a set of general acquisition circuits 3, the measurement of eddy current sensor 5, LVDT sensor 5, magnetoelectric sensor 5, and piezoelectric sensor 5 can be realized, and various types of sensor signals 5 can be effectively acquired and processed, corresponding to DC signals, AC signals, AC / DC mixed signals, and frequency signals. The entire device can comprehensively measure signals from various TSI sensors, eliminating the need for users to assemble different devices themselves. It covers sensors capable of measuring various parameters such as vibration, axial displacement, differential expansion, eccentricity, and rotational speed, including eddy current sensors, DC LVDT sensors, magnetoelectric sensors, and piezoelectric sensors. The execution and sampling processes are integrated into a closed-loop system. Through the design of control and feedback circuits, it achieves control of servo motors, stepper motors, relays, etc., and, in conjunction with feedback from the grating ruler and motor stepping signals, effectively reduces the tediousness and errors of manual operation. This closed-loop system ensures high accuracy and efficiency in the calibration process.

[0032] Furthermore, such as Figures 1-5 As shown, in this embodiment, the control and feedback circuit 2 is provided with a motor control output interface 21, an encoder input interface 22, an oscillation signal output interface 23, a switch input interface 24, and a switch output interface 25.

[0033] Specifically, the motor control output interface 21 includes an RS485 communication port as a servo motor interface, used to send running commands and read back feedback information, and a transistor output circuit used to control the stepper motor. The configuration varies depending on the motor interface and is generally for stepping pulse, direction, and enable.

[0034] Encoder input interface 22: Provides a set of encoder interfaces and quadrature signal decoding circuits, and can also be directly decoded by software. When used with a grating ruler, it can achieve micron-level displacement.

[0035] Oscillation signal output interface 23: Provides an oscillation signal output interface 23 with programmable frequency and amplitude. After power amplification, it controls the movement of the exciter to generate a vibration signal.

[0036] Digital input interface 24: used for limit switches, motor alarms, etc., with a total of four channels, which are dry contact signals.

[0037] Digital output interface 25: Used for start / stop signals, status information, etc., four channels in total, all dry contact signals. Further, such as... Figures 1-5 As shown, this embodiment also includes a USB interface and an RS485 interface. The processing unit 1 communicates with the computer via the USB interface and with third-party devices via the RS485 interface, acquiring, processing, and analyzing the signals from the sensor 5 in real time, and automatically generating a detection report. This not only improves work efficiency but also reduces errors from manual recording and analysis, ensuring the accuracy and reliability of the detection results. The overall control actuator 4 operates to generate the measured signal, acquire and process the measured signal, analyze the signal, and generate diagnostic information, thus achieving functional integration.

[0038] Furthermore, such as Figures 1-5 As shown, in this embodiment, it also includes a touch screen 6, which is connected to the computing unit 1. The touch screen 6 is used to display information and receive user input, which facilitates human-computer interaction.

[0039] Example 1: As Figure 2 As shown, the actuator 4 includes: a stepper motor 411, a lead screw 412, a slide 413, and a grating ruler 414. The stepper motor 411 is connected to the control and feedback circuit and the lead screw 412. The slide 413 is threadedly fitted onto the lead screw 412. The stepper motor 411 receives the drive signal output from the control and feedback circuit, drives the lead screw 412 to rotate, and causes the slide 413 to slide along the lead screw 412. The grating ruler 414 includes a scale grating and a reading head. The reading head is connected to the slide 413. The scale grating is parallel to the lead screw 412. The grating ruler 414 is connected to the control and feedback circuit 2 and outputs a signal to the control and feedback circuit 2. The grating ruler 414 is used to acquire position information. A target plate is provided on the slide 413, and the target plate is positioned opposite to the sensor 5. Limit switches 415 are provided at both ends of the lead screw 412. The limit switches 415 are connected to the control and feedback circuit and are used to protect the motor. This embodiment is used to verify displacement signals, including an eddy current displacement sensor 5 and an LVDT displacement sensor 5.

[0040] Example 2: Figure 3As shown, the actuator 4 includes an electric modal oscillator 42, which is connected to the control and feedback circuit 2. In this embodiment, the displacement, velocity, and acceleration signals of simulated vibration can be used for the calibration of the magnetoelectric velocity sensor 5, piezoelectric velocity sensor 5, piezoelectric accelerometer 5, and two-wire vibration sensor 5. The control and feedback circuit outputs a programmable sine wave signal with a programmable frequency and amplitude, amplified by a power amplifier, to drive the electric modal oscillator 42. The sensor 5 outputs a signal to the acquisition circuit 3.

[0041] Example 3: Figure 4 As shown, the actuator 4 includes a servo controller 431, a servo motor 432, and a gear 433. The servo controller 431 is connected to the servo motor 432 and the control and feedback circuit 2. The servo motor 432 is connected to the gear 433. The control and feedback circuit 2 controls the servo motor 432 to run through the servo controller 431, driving the gear 433 to rotate. This embodiment simulates signals such as rotational speed, overspeed, and reverse rotation, which can be used for the verification of pulse sensors 5 such as magnetoresistive speed sensors 5, Hall effect speed sensors 5, inductive speed sensors 5, and proximity switches. The control and feedback circuit communicates with the servo controller 431 to control the movement of the servo motor 432, driving the gear 433. The sensor 5 outputs a signal to the acquisition circuit 3.

[0042] Above, refer to Figures 1-5 This invention describes a sensor calibration device for a turbine monitoring and protection instrument according to an embodiment of the present invention. The device is fully functional and can measure various TSI sensor signals without requiring user assembly. It integrates execution and sampling to form a closed loop in the testing process, reducing the tediousness and errors of manual operation.

[0043] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0044] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A sensor verification device for a turbine monitoring and protection system, characterized by, It comprises an operation unit, a control and feedback circuit, a collection circuit and an execution mechanism. The output end of the control and feedback circuit is connected with the execution mechanism, and the control and feedback circuit controls the operation of the execution mechanism. The input end of the collection circuit is connected with the sensor. The sensor detects the change of the execution mechanism and converts it into a measurement signal, and the sensor outputs the measurement signal to the collection circuit, and the collection circuit collects and processes the measurement signal. The operation unit is connected with the control and feedback circuit and the collection circuit, and the operation unit sends a control instruction to the control and feedback circuit and receives the measurement signal processed by the collection circuit.

2. A sensor calibration device for a turbine monitoring and protection instrument as claimed in claim 1, characterized in that The control and feedback circuit is provided with a motor control output interface, an encoder input interface, an oscillation circuit output interface, a switching value input interface and a switching value output interface.

3. The sensor calibration apparatus for a turbine monitoring and protection instrument as recited in claim 1, wherein, It also comprises a USB interface and an RS485 interface, and the operation unit communicates with a computer through the USB interface and communicates with a third-party device through the RS485 interface.

4. The sensor calibration apparatus for a turbine monitoring and protection instrument as recited in claim 1, wherein, It also comprises a touch screen connected with the operation unit, and the touch screen is used for displaying information and receiving user input.

5. The sensor calibration apparatus for a turbine monitoring and protection instrument as recited in claim 1, wherein, The execution mechanism comprises a stepper motor, a lead screw, a sliding table and a grating ruler. The stepper motor is connected with the control and feedback circuit and the lead screw, and the sliding table is threadedly connected on the lead screw. The stepper motor receives the driving signal output by the control and feedback circuit, drives the lead screw to rotate, and drives the sliding table to move along the lead screw. The grating ruler comprises a scale grating and a reading head, the reading head is connected with the sliding table, the scale grating is parallel to the lead screw, the grating ruler is connected with the control and feedback circuit, and outputs a signal to the control and feedback circuit. The sliding table is provided with a target plate, and the target plate is arranged opposite to the sensor.

6. A sensor calibration device for a turbine monitoring and protection system as claimed in claim 5, wherein, The two ends of the lead screw are provided with limit switches connected with the control and feedback circuit.

7. The sensor calibration apparatus for a turbine monitoring and protection instrument as recited in claim 1, wherein The execution mechanism comprises an electric modal shaker connected with the control and feedback circuit.

8. The sensor verification apparatus for a turbine monitoring and protection system as recited in claim 1, wherein, The execution mechanism comprises a servo controller, a servo motor and a gear part. The servo controller is connected with the servo motor and the control and feedback circuit, and the servo motor is connected with the gear part. The control and feedback circuit controls the operation of the servo motor through the servo controller to drive the gear part to rotate.

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