Multifunctional instrument synchronous calibration table

Abstract

The invention belongs to the technical field of instrument calibration, and relates to a multifunctional instrument synchronous calibration table. The invention relates to a multifunctional instrument synchronous calibration table, which comprises a main control circuit board, a device operation button; a power supply module; a gas source interface; an instrument gas source interface; an instrument signal interface; a signal output interface; and the microcontroller is arranged on the main control board. The instrument calibration device has the remarkable effects that the instrument calibration efficiency can be improved by applying the instrument calibration device, so that the unit income is improved, the repeated physical labor is reduced, the personnel cost is reduced, the effects of reducing cost and increasing efficiency are achieved, and the instrument calibration device has popularization value in the nuclear power industry and other industries adopting a large number of instruments.

Description

Technical Field

[0001] The present invention belongs to the technical field of instrument calibration, and relates to a multi-functional instrument synchronous calibration bench. Background Art

[0002] In process systems of industries such as nuclear power plants, a large number of instruments such as pointer pressure gauges, pressure transmitters, and pressure switches are used to monitor system parameters. During the installation stage of the unit (or other industry projects, hereinafter referred to as the unit), each instrument needs to be calibrated and can only be installed after passing the calibration; during the operation stage of the unit, the instruments need to be calibrated daily according to the program requirements. According to the data of VVER units, the number of pressure-type instruments in a dual-unit reaches several thousand. The large number of instruments and the long calibration process are common problems.

[0003] As shown in the appendix Figure 1 At present, the conventional method for calibrating instruments is to calibrate each instrument one by one through a calibrator. During each instrument calibration process, generally 5 pressure points are selected, and the pressure stabilization and holding time at each pressure point is relatively long. It is necessary to repeatedly adjust the pressure test bench to make the pressure stable at the selected pressure point. The average calibration time for each instrument is about 25 minutes, of which the total time for pressurization and pressure stabilization is 20 minutes, accounting for 80% of the total time. The time distribution diagram is as shown in the appendix Figure 2 shown.

[0004] If multiple instruments are calibrated by one pressurization and pressure stabilization, if the number of instruments calibrated simultaneously is N, then equivalently, the pressurization and pressure stabilization time of each instrument is shortened to 1 / N of the original.

[0005] According to daily work, especially in the nuclear power field (taking the VVER reactor type as an example), there are many instruments with the same parameters (the same range or the same pressure setting value). At the same time, it is summarized that the pressure-type instruments to be calibrated include pressure transmitters, pressure switches, and conventional pointer pressure gauges. If multiple instruments with the same parameters can be calibrated simultaneously, that is, one pressurization and pressure stabilization can serve multiple instruments at the same time, it will indirectly shorten the pressurization and pressure stabilization time of instrument calibration and achieve the effect of significantly improving work efficiency.

[0006] For simultaneous calibration of multiple instruments, there are still the following two problems in the prior art: 1) For pressure transmitters, each time power is applied, the instrument needs to wait for initialization. If a conventional mechanical switch is used to supply power to the transmitter and switch, only one transmitter is powered on and connected to the external calibrator each time. This scheme is obviously not feasible, and there will be no obvious efficiency improvement after overall time calculation. The calibration bench is required to have the function of not interrupting the power supply to the transmitter when switching the signal output and after switching; 2) For multiple types of instruments (pressure transmitters, pressure switches, and conventional pointer pressure gauges), it is necessary to replace the calibration bench frame or wiring, which causes a lot of trouble, affects the efficiency to a certain extent, and occupies a lot of space. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides a multifunctional instrument synchronous calibration bench.

[0008] The present invention is implemented as follows: A multifunctional instrument synchronous calibration bench, which includes

[0009] Main control circuit board: Supplies power to the transmitter and receives the output signal of the transmitter; is used to receive the input signal of the operation button, perform logical judgment, make a working mode switch, select the corresponding transmitter signal and connect it to the calibration bench signal output interface, and perform the corresponding display signal output. The same signal input interface can receive the analog signal of the transmitter and the digital signal of the pressure switch. When switching channels, continuous power supply to the instruments of each channel is maintained.

[0010] Calibration bench operation buttons: Realize the human-computer interaction function. Power switch: Turn on and off the power of the calibration bench through this button, and display the power status through the indicator light. Mode selection: Select the working mode of the calibration bench through the mode selection button. The selectable modes include pressure transmitter and pressure switch, and the current mode is displayed through the indicator light. Channel selection: Channels 1 - 5 are shown in the attached drawing of the calibration bench. The transmitter signal of the corresponding channel can be selected to be output from the calibration bench signal output port to the external calibrator through 5 buttons, and the current output signal channel is displayed through the indicator light integrated on the button.

[0011] Power supply module: Supplies power to the main control circuit board.

[0012] Gas source interface: Connects to an external gas source, such as a pressure calibrator, to introduce the gas source pressure into the calibration bench.

[0013] Instrument gas source interface: Connects to the gas source interface of the instrument to be calibrated.

[0014] Instrument signal interface: Supplies power to the instrument and receives the output signal of the instrument at the same time.

[0015] Signal output interface: Outputs the signal of the selected instrument channel to the calibration standard, such as a pressure calibrator.

[0016] Microcontroller on the main control board: Receives external button signals, performs logical operations, outputs control signals, and controls the changeover switch and indicator lights.

[0017] Changeover switch on the main control board: Receives the microcontroller signal and switches the instrument signal to the calibration bench signal output interface.

[0018] A multifunctional instrument synchronous calibration bench as described above, which further includes

[0019] Calibration bench housing: Serves as a bearing platform for various mechanical and electrical and electronic accessories, and is used to install various accessories of the calibration bench.

[0020] A multifunctional instrument synchronization calibration bench as described above, further comprising

[0021] Floor screws: used to support the calibration bench housing.

[0022] A multifunctional instrument synchronization calibration bench as described above, further comprising

[0023] Gas source pipe: Connects the gas source interface to an external gas source to transmit gas source pressure.

[0024] Gas source valve: Connects or isolates the gas source of the corresponding transmitter.

[0025] A multifunctional instrument synchronization calibration bench as described above, further comprising

[0026] Instrument signal line: Connects the signal terminals of the instrument to be calibrated to the instrument signal interface of the calibration bench.

[0027] A multifunctional instrument synchronization calibration bench as described above, further comprising

[0028] Calibration bench printed text: Used to explain the functions of buttons or sockets.

[0029] The remarkable effect of the present invention is that the application of this calibration bench can improve the instrument calibration efficiency, thereby increasing the unit revenue, reducing repetitive manual labor, lowering personnel costs, achieving the effect of "cost reduction and efficiency improvement", and having promotion value in the nuclear power industry and other industries that widely use instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of conventional pressure transmitter / pressure switch calibration

[0031] Figure 2 Conventional pressure transmitter calibration time distribution diagram (P1 - P5 represent five pressure test points)

[0032] Figure 3 is the external view of the multi-channel instrument calibration bench;

[0033] Figure 4 is the schematic diagram of the principle of the multi-channel instrument calibration bench.

[0034] In the figure, 1. Calibration table housing, 2. Calibration table operation button (with indicator light), 3. Floor screw, 4. Main control circuit board, 5. Power supply module, 6. Gas source interface, 7. Gas source valve, 8. Gas source pipe, 9. Instrument gas source interface, 10. Instrument signal interface, 11. Instrument signal line, 12. Signal output interface, 13. Printed text on the calibration table, 14. Instrument to be calibrated, 15. Microcontroller on the main control board, 16. Toggle switch on the main control board, 101. Pressure calibrator, 102. Pressure transmitter, 103. Current signal line, 104. Gas source pipe. Detailed implementation

[0035] The structure of the calibration table is as follows:

[0036] The calibration table is processed from metal plate material into a cuboid housing. Various mechanical, electrical, and electronic accessories are installed by opening holes on the panel of the housing. The power supply module and the main control circuit board are installed inside the housing, and the floor screws are installed at the bottom of the housing. The functions of each component are described in detail as follows:

[0037] 1. Calibration table housing: As a bearing platform for various mechanical, electrical, and electronic accessories, it is used to install various accessories of the calibration table;

[0038] 2. Calibration table operation button (with indicator light): Realize the human-machine interaction function. Power switch: Turn on and off the power supply of the calibration table through this button, and display the power status through the indicator light. Mode selection: Select the working mode of the calibration table through the mode selection button. The selectable modes include pressure transmitter and pressure switch, and the current mode is displayed through the indicator light. Channel selection: Channels 1 - 5 are shown in the attached drawing of the calibration table. The transmitter signal of the corresponding channel can be selected through 5 buttons to be output from the signal output port of the calibration table to the external calibration table, and the channel of the current output signal is displayed through the indicator light integrated with the button.

[0039] 3. Floor screw: Used to support the calibration table housing.

[0040] 4. Main control circuit board: Supply power to the transmitter and receive the output signal of the transmitter; used to receive the input signal of the operation button, perform logical judgment, make a working mode switch, select the corresponding transmitter signal to be connected to the signal output interface of the calibration table, and output the corresponding display signal.

[0041] 5. Power supply module: Supply power to the main control circuit board.

[0042] 6. Gas source interface: Connect to an external gas source, such as a pressure calibrator, to introduce gas source pressure into the calibration table.

[0043] 7. Gas source valve: Connect or isolate the gas source of the corresponding transmitter.

[0044] 8. Gas source pipe: Transmit gas source pressure.

[0045] 9. Instrument air supply interface: Connects to the air supply interface of the instrument to be calibrated.

[0046] 10. Instrument signal interface: Supplies power to the instrument and receives the output signal of the instrument.

[0047] 11. Instrument signal line: Connects the signal terminal of the instrument to be calibrated (such as a pressure transmitter) to the instrument signal interface of the calibration bench.

[0048] 12. Signal output interface: Outputs the signal of the selected instrument channel to the calibration standard, such as a pressure calibrator.

[0049] 13. Printed text on the calibration bench: Used to explain the functions of buttons or sockets.

[0050] 14. Instrument to be calibrated: Installed on the instrument air supply interface and connects the signal line to the instrument signal interface of the calibration bench.

[0051] 15. Microcontroller on the main control board: Receives external key signals, performs logical operations, and outputs control signals to control the changeover switch and indicator lights.

[0052] 16. Changeover switch on the main control board: Receives the microcontroller signal and switches the instrument signal to the signal output interface of the calibration bench.

[0053] The circuit functions of the calibration bench are as follows:

[0054] The calibration bench integrates the circuit part for instrument signal switching selection, realizing the functions of both expandable air supply interface and signal switching. The new type of calibration bench can meet the calibration requirements of instruments with signal output such as transmitters and pressure switches, and also meet the calibration requirements of conventional pointer pressure gauges.

[0055] The usage method of the calibration bench is as follows:

[0056] The operation steps and action principles are as follows:

[0057] 1) Connect the mechanical and electrical parts of the instrument to the calibration bench;

[0058] 2) Connect the external power supply to the calibration bench, press the "Switch" button on the front panel to power on the control part of the calibration bench, and the calibration bench software starts running and completes initialization;

[0059] 3) After power-on, the transmitter mode is default and the first channel is selected. Select the "Transmitter" or "Pressure Switch" mode through the mode selection button. After the main control board recognizes the key signal, it automatically runs the program of the corresponding mode and lights up the corresponding mode indicator light;

[0060] 4) In the transmitter mode, the action principle is:

[0061] a. Initialize the corresponding software in this mode;

[0062] b. Select the instrument signal output of the corresponding channel through the channel selection button;

[0063] c. After reading the signal value of this channel, switch to the instrument signal of other channels for output through the channel selection button;

[0064] d. After the main control board recognizes the corresponding channel selection signal, control the corresponding switching switch (relay) to act and light up the corresponding indicator light;

[0065] e. During the operation process, the main control board monitors the current situation of each channel in real time. When it exceeds 30 mA (the maximum output current of a normal instrument is 20 mA, and it will exceed 20 mA in case of instrument failure or short - circuit caused by operation error), after software filtering processing, over - current protection is issued. After over - current protection, the power supply of this channel is immediately interrupted, 2 beeping prompts are issued, the indicator light of the corresponding channel flashes quickly, and after 2 seconds, it is allowed to reset the alarm through the key of the over - current channel and restore the power supply of this channel.

[0066] 5) In the pressure switch mode, the operation principle is as follows:

[0067] a. Initialize the corresponding software in this mode;

[0068] b. The calibration bench monitors the status of the pressure switches of each channel in real time;

[0069] c. When the pressure switch of a certain channel is closed, 1 beeping prompt is issued, and the indicator light of the corresponding channel gives an indication. When this channel is the last one to be closed, the indicator light flashes. When this channel is not the last one to be closed, the indicator light is always on. When the pressure switch of this channel is not closed, the indicator light is off.

[0070] d. In this mode, the channel selection button is invalid.

[0071] At any time, when a key is pressed, there is 1 beeping prompt sound.

Claims

1. A multifunctional instrument synchronous calibration bench, characterized in that: It includes Main control circuit board (4): Supplies power to the transmitter and receives the output signal of the transmitter; is used to receive the input signal of the operation button, perform logical judgment, make a working mode switch, select the corresponding transmitter signal to connect to the device signal output interface, and perform corresponding display signal output. Device operation buttons (2): Realize the man-machine interaction function. Power switch: Turns on and off the device power supply through this button, and displays the power status through an indicator light. Mode selection: Selects the working mode of the device through the mode selection button. The selectable modes include pressure transmitter and pressure switch, and the current mode is displayed through an indicator light. Channel selection: Channels 1 - 5 are shown in the device drawing. The transmitter signal of the corresponding channel can be selected to be output from the device signal output port to the external calibration bench through 5 buttons, and the current output signal channel is displayed through the indicator light integrated on the button. Power supply module (5): Supplies power to the main control circuit board. Gas source interface (6): Connects to an external gas source, such as a pressure calibrator. Instrument gas source interface (9): Connects to an external gas source, such as a pressure calibrator, to introduce gas source pressure into the device. Instrument signal interface (10): Supplies power to the instrument and receives the instrument output signal simultaneously. Signal output interface (12): Outputs the signal of the selected instrument channel to a calibration standard device, such as a pressure calibrator. Microcontroller (15) on the main control board: Receives external button signals, performs logical operations, and outputs control signals to control the changeover switch and indicator lights. Changeover switch (16) on the main control board: Receives the microcontroller signal and switches the instrument signal to the device signal output interface.

2. A multifunctional instrument synchronous calibration bench according to claim 1, characterized in that: It further includes Device housing (1): Serves as a carrier platform for various mechanical and electrical and electronic accessories, and is used to install various accessories of the calibration device.

3. A multifunctional instrument synchronous calibration bench according to claim 2, characterized in that: It further includes floor screws (3): Used to support the device housing.

4. A multifunctional instrument synchronous calibration bench according to claim 3, characterized in that: It further includes a gas source pipe (8): Connects the gas source interface (6) to the external gas source to transmit the gas source pressure. Gas source valve (7): Connects or isolates the gas source of the corresponding transmitter.

5. A multifunctional instrument synchronous calibration bench according to claim 4, characterized in that: It further includes an instrument signal wire (11): Connects the signal terminal of the instrument to be calibrated to the device instrument signal interface.

6. A multifunctional instrument synchronous calibration bench according to claim 5, characterized in that: It further includes device printed text (13): Used to explain the functions of buttons or sockets.

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