Shearing pin signal monitoring system

Abstract

The utility model belongs to the technical field of hydro-generators, and particularly relates to a shear pin signal monitoring system which comprises an ARM, a first I2C expansion circuit, a second I2C expansion circuit, a nixie tube driving circuit, an RS485 communication module, a first optocoupler, a second optocoupler, a light emitting diode, a nixie tube and an alarm relay. The shear pin annunciator is connected to the first I2C expansion circuit through the first optocoupler, the first I2C expansion circuit is connected to the first I2C serial port bus of the ARM, the second I2C serial port bus of the ARM is connected to the second I2C expansion circuit, and the second I2C expansion circuit is connected to the light emitting diode. An IO port of the ARM is connected with an alarm relay through a second optocoupler, an SPI serial port bus of the ARM is connected with a nixie tube through a nixie tube driving circuit, and an ARM serial port is connected with a far-end receiver through an RS485 module. The system can simultaneously monitor 40 paths of shear pins at most.

Description

Technical Field

[0001] The utility model belongs to the technical field of water turbine generators, and in particular relates to a shear pin signal monitoring system. Background Art

[0002] The turbine water guide structure is one of the core components of the hydro-generator set. It is a device that controls the direction and size of the water flow entering the unit during operation. It is crucial to the stability and safety of the operation of each unit.

[0003] The main functions of the shear pin in the mechanical rotation of the water-conducting structure are protection, monitoring and signal transmission. When the guide vanes in the water-conducting structure are stuck by foreign objects or cannot be turned closed, the required operating force will increase, and the shear pin will break at the weakest surface of its structure, thereby protecting other rotating parts from damage. This design allows the hydroelectric generator to automatically close the guide vanes when encountering problems, preventing more serious failures from occurring. Once the shear pin breaks, it triggers the equipped signal device to send an alarm signal, which helps to promptly detect and deal with potential problems and ensure the normal operation of the equipment. The Chinese utility model patent with publication number CN214464630U proposes a shear pin monitoring device, but it can only monitor a maximum of 24 shear pins and requires on-site personnel to be on duty. Once a temporary power outage occurs, the alarm data will be cleared, causing inconvenience to the subsequent investigation of related situations. Utility Model Content

[0004] The utility model aims to provide a shear pin signal monitoring system to solve the problems in the prior art that the serial port of the monitoring device cannot be expanded, the number of shear pins that can be monitored is limited, and the function is single.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A shear pin signal monitoring system, comprising an ARM, an I2C expansion circuit 1, an I2C expansion circuit 2, a digital tube drive circuit, an RS485 communication module, an optical coupler 1, an optical coupler 2, a light emitting diode, a digital tube, and an alarm relay;

[0007] The shear pin annunciator is connected to I2C expansion circuit 1 through optocoupler 1, I2C expansion circuit 1 is connected to I2C serial port bus 1 of ARM, I2C serial port bus 2 of ARM is connected to I2C expansion circuit 2, and I2C expansion circuit 2 is connected to a light emitting diode; one IO port of ARM is connected to the alarm relay through optocoupler 2, the SPI serial port bus of ARM is connected to the digital tube through the digital tube driving circuit, and the ARM serial port is connected to the remote receiver through the RS485 module.

[0008] Furthermore, three digital tubes are provided, which are used to display the number of monitored shear pins, RS485 address and normally open or normally closed type of the shear pin signaler, and three buttons are also provided for setting monitoring parameters.

[0009] Furthermore, it also includes a switching power supply and a voltage stabilizing circuit. The switching power supply is used to convert the 220V AC voltage into +5V and +24V, and the voltage stabilizing circuit is used to convert the 5V voltage into a 3.3V voltage.

[0010] Furthermore, the model of the ARM is STM32F103T6C8.

[0011] Furthermore, the models of the I2C expansion circuit 1 and the I2C expansion circuit 2 are PCF8574.

[0012] Furthermore, the model of the digital tube driving circuit is ZLG7289.

[0013] Furthermore, the model of the RS485 communication module is TD301D485.

[0014] Furthermore, the model of the voltage stabilizing circuit is AS1117-3.3.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0016] The utility model system can monitor 40 shear pins at most at the same time through the cooperation of I2C expansion circuit and ARM, and has the function of data parameter memory protection after power failure, avoiding the loss caused by unexpected situations. It is connected to the remote receiver through RS485 communication interface, with long transmission distance and strong anti-interference, realizing remote monitoring without on-site supervision, saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the principle diagram of the utility model system.

[0018] Figure 2 Schematic diagram of the overall circuit relationship of the system in the embodiment.

[0019] Figure 3 Schematic diagram of the circuit relationship of the shear pin signaler in the embodiment.

[0020] Figure 4 Schematic diagram of the circuit relationship of the switching power supply in the embodiment.

[0021] Figure 5 This is a schematic diagram of the relationship between the digital tube and the driving circuit in implementation.

[0022] Figure 6 It is a schematic diagram of the connection through the parallel port expansion circuit in implementation. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific implementation methods.

[0024] like Figure 1 As shown, the utility model discloses a shear pin signal monitoring system, including ARM, I2C expansion circuit 1, I2C expansion circuit 2, digital tube driving circuit, RS485 communication module, optocoupler 1, optocoupler 2, light emitting diode, digital tube, and alarm relay; the shear pin signal device is connected to I2C expansion circuit 1 through optocoupler 1, I2C expansion circuit 1 is connected to I2C serial port bus 1 of ARM, I2C serial port bus 2 of ARM is connected to I2C expansion circuit 2, and I2C expansion circuit 2 is connected to light emitting diode; one IO port of ARM is connected to the alarm relay through optocoupler 2, the SPI serial port bus of ARM is connected to the digital tube through the digital tube driving circuit, and the ARM serial port is connected to the remote receiver through the RS485 module.

[0025] Example:

[0026] In this embodiment, the ARM model is STM32F103T6C8; Figure 3 As shown, the shear pin signaler is connected to the I2C parallel port expansion circuit 1 through an optical coupler, and the I2C expansion circuit 1 is connected to the ARM through the I2C serial port bus 1. Each I2C parallel port expansion circuit 1 is connected to 8 shear pin signalers, and 40 shear pin signalers are connected to 5 I2C parallel port expansion circuits 1 through 40 optical couplers; 5 I2C parallel port expansion circuits 1 are connected to 40 light-emitting diodes, and 40 light-emitting diodes correspond to 40 shear pin signalers. The optical coupler model in this embodiment is P181.

[0027] The digital tube driving circuit drives three digital tubes. The model of the digital tube driving circuit in this embodiment is ZLG7289, which has an SPI serial interface function and can drive 8 digital tubes at the same time. The intelligent display driver chip is connected to ARM through the SPI serial bus. Figure 5 shown.

[0028] like Figure 2 As shown, the ARM serial port transmits the shear pin signal to the remote receiver through the RS485 module, and one IO port of the ARM is connected to the alarm relay through an optical coupler.

[0029] The I2C parallel port expansion circuit model is PCF8574, which can realize IO port expansion of ARM through two bidirectional I2C serial port buses. The device contains an 8-bit quasi-bidirectional port and an I2C bus interface, and the output port latch can drive LED.

[0030] The RS485 module model is TD301D485, which converts the TTL level signal of the ARM serial port into an RS485 level signal. It has input and output voltage isolation and dual-channel isolation, and has the characteristics of long transmission distance and strong anti-interference.

[0031] like Figure 4 As shown, the switching power supply converts the AC 220V into +5V and +24V, +5V provides the working voltage for PCF8574 and ZLG7289, the voltage regulator circuit AS1117-3.3 converts the 5V voltage into 3.3V voltage, provides the working voltage for ARM, and +24V provides the working voltage for the shear pin signal device.

[0032] The working principle of the utility model is:

[0033] After the device is powered on, it performs initialization settings, including the number of monitored shear pins, the RS485 address of the device and the normally open or normally closed type of the shear pin signal. These three parameters can be set through 3 buttons and 3 digital tubes; the 3 digital tubes display the number of monitored shear pins, the RS485 address and the normally open or normally closed type of the shear pin signal.

[0034] like Figure 3 As shown, every 8 shear pin signal detectors convert the shear pin signals into TTL level signals through 8 optocouplers and transmit them to an I2C parallel port expansion circuit PCF8574 through an 8-bit parallel port, 40 optocouplers convert 40 shear pin signals (1# shear pin signal detector ~ 40# shear pin signal detector) into 40 parallel port signals (IB1 ~ IB40), 5 I2C parallel port expansion circuits PCF8574 convert 40 parallel port signals (IB1 ~ IB40) into I2C serial port signals, and ARM reads 40 shear pin signals from 5 I2C parallel port expansion circuits PCF8574 (I2C parallel port expansion circuit 1 ~ I2C parallel port expansion circuit 5) through I2C bus 1 respectively.

[0035] like Figure 6As shown, AMR processes and converts the read 40-channel shear pin signals into 40 light-emitting diode (LED) on or off signals (the shear pin is sheared and the LED is off), and writes to 5 I2C parallel port expansion circuits PCF8574 (I2C parallel port expansion circuit 6 to I2C parallel port expansion circuit 10) through I2C serial port bus 2. Each I2C parallel port expansion circuit PCF8574 converts the light-emitting diode on or off signals of 8 LEDs into 8-bit parallel port signals. The 5 I2C parallel port expansion circuits PCF8574 convert the light-emitting diode on or off signals of 40 LEDs into 40-bit parallel port signals (JD1 to JD40). The 40-bit parallel port signals (JD1 to JD40) control the lighting or shutting down of the 40 LEDs. The 40 LEDs correspond to 40-channel shear pin signal devices. The shear pin is sheared and the corresponding LED is lit, while the shear pin is not sheared and the corresponding LED is off.

[0036] When the shear pin is actuated, ARM drives the optocoupler to operate through an IO interface, the optocoupler drives the alarm relay to operate, and the passive contacts of the alarm relay control the external automation control loop.

[0037] ARM writes the driving signals of the three digital tubes into the digital tube driving circuit ZLG7289 through the SPI serial port. ZLG7289 drives the eight signal lines (a, b, c, d, e, f, g, DP) corresponding to the digital tube through eight IO ports to control the lighting or extinguishing of the eight-segment LED of the digital tube to form numbers and symbols. The three digital tubes are used to display the number of monitored shear pins, the RS485 communication address in the device parameters, and the normally open or normally closed display of the shear pin signal.

[0038] ARM converts the 40-way shear pin signal into a serial port signal according to the MODBUS RTU communication protocol, writes it into the RS485 module TD301D485 through the serial port of ARM, converts it into RS485 signal and transmits it to the remote receiver for remote monitoring.

[0039] The content of the utility model is not limited to the examples listed, and any equivalent changes made to the technical solution of the utility model by ordinary technicians in this field after reading the specification of the utility model are covered by the claims of the utility model.

Claims

1. A shear pin signal monitoring system, characterized in that: It includes ARM, I2C expansion circuit 1, I2C expansion circuit 2, digital tube driving circuit, RS485 communication module, optocoupler 1, optocoupler 2, light emitting diode, digital tube, and alarm relay; the shear pin signaler is connected to I2C expansion circuit 1 through optocoupler 1, I2C expansion circuit 1 is connected to I2C serial port bus 1 of ARM, I2C serial port bus 2 of ARM is connected to I2C expansion circuit 2, and I2C expansion circuit 2 is connected to light emitting diode; one IO port of ARM is connected to the alarm relay through optocoupler 2, the SPI serial port bus of ARM is connected to the digital tube through the digital tube driving circuit, and the ARM serial port is connected to the remote receiver through the RS485 module.

2. The shear pin signal monitoring system according to claim 1, characterized in that: There are three digital tubes, which are used to display the number of monitored shear pins, RS485 address and normally open or normally closed type of the shear pin signal. There are also three buttons for setting monitoring parameters.

3. The shear pin signal monitoring system according to claim 2, characterized in that: It also includes a switching power supply and a voltage stabilizing circuit. The switching power supply is used to convert the 220V AC voltage into +5V and +24V, and the voltage stabilizing circuit is used to convert the 5V voltage into 3.3V voltage.

4. The shear pin signal monitoring system according to claim 3, characterized in that: The model of the ARM is STM32F103T6C8.

5. The shear pin signal monitoring system according to claim 3, characterized in that: The models of the I2C expansion circuit 1 and the I2C expansion circuit 2 are PCF8574.

6. The shear pin signal monitoring system according to claim 3, characterized in that: The model of the digital tube driving circuit is ZLG7289.

7. The shear pin signal monitoring system according to claim 3, characterized in that: The model of the RS485 communication module is TD301D485.

8. The shear pin signal monitoring system according to claim 3, characterized in that: The model of the voltage stabilizing circuit is AS1117-3.3.

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