Intelligent monitoring device for shear signal of shear pin

Abstract

The utility model discloses an intelligent monitoring device for a shear signal of a shear pin, comprising a 24VDC power supply which is electrically connected with the input end of a PLC controller; the PLC is electrically connected with the shear pin signal acquisition module; the output end of the PLC is electrically connected with the alarm device, and the PLC is electrically connected with the touch screen. The device solves the problems that a monitoring device in the prior art cannot position a specific fault point, a fault signal cannot be self-held, and fault indication is lacked, and has the characteristics that the position of a misoperation signal can be captured, historical data can be stored, and the fault point can be accurately positioned.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to an intelligent monitoring device for shearing signals of shear pins. Background Art

[0002] Guide vane safety protection device: The guide vane adopts a copper sleeve clamping friction device to protect it from floating back and forth in the water flow after the shear (pull) pin breaks. Dongfang Electric and Harbin Electric units use shear pins, and ALSTOM units use pull pins to prevent the guide vanes from being damaged when abnormal blocking occurs during the closing process; when the turbine generator is running, the shear pin is cut and the unit speed is >105%, and the monitoring system starts the "Class I mechanical accident process" at the same time, and the fast door is lowered. The shear pin shearing signal is an important guarantee for the safety protection of the guide vane; at present, the shear pin of the Dongfang Electric unit: 24 guide vane auxiliary crank arms are equipped with a limit switch for sending signals after the shear pin is cut, and each group of 6 limit switches is 4 groups in total, and the contact signals are sent to the 4 terminal boxes BU86-BU89 in the machine pit. Each limit switch has 1 normally open and 1 normally closed contact; the normally closed contacts are connected in series, and after any contact is actuated, a "shear pin cut" signal is sent to the monitoring system and the overspeed signal is ANDed to the fast door. The turbine instrument cabinet is equipped with a white light PL04 ​​indicating the shear pin fault signal to indicate that the shear pin has been cut; ALSTOM unit break pin: 24 guide vane auxiliary arms are equipped with a limit switch to send a signal after the break pin is broken. Each limit switch has 1 normally open and 1 normally closed contact. 24 normally closed contacts are connected in series, and after any contact is actuated, a "break pin cut" signal is sent to the monitoring system and the overspeed signal is ANDed to the fast door.

[0003] Therefore, the shear pin signal monitoring of the hydro-turbine generator set is mostly judged by hard wiring. The specific principle is: the displacement signal of the shear pin is converted into a switch electrical signal by a position travel switch. When the shear pin is cut, the position travel switch changes position and sends its signal to the nearby transfer section box. After logical judgment is made through the hard wiring in the terminal box, the shear pin alarm status is output, as shown in the instruction manual. Figure 3 As shown; the prior art has the following disadvantages:

[0004] 1. When the shear pin signal alarm malfunctions, the fault signal has no self-holding and historical data, which makes it difficult to locate the fault point; 2. The number of shear pin signals (24 for a single machine) is huge, and there is no status indication. When individual signal switches fail, they need to be checked one by one, and the fault point cannot be located quickly, which results in a large workload; therefore, it is necessary to design an intelligent monitoring device for shear pin shearing signals to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an intelligent monitoring device for the signal of a shear pin being cut, which is used to solve the problems that the existing monitoring devices cannot locate the specific fault points, the fault signals cannot be self - held, and there is a lack of fault indication. It has the characteristics of being able to capture the position of false - action signals and save historical data, and can accurately locate the fault points.

[0006] To solve the above - mentioned technical problems, the technical solution adopted by the utility model is as follows: An intelligent monitoring device for the signal of a shear pin being cut includes a 24VDC power supply, and the 24VDC power supply is electrically connected to the input end of a PLC controller; the PLC controller is electrically connected to a shear - pin signal acquisition module; the output end of the PLC controller is electrically connected to an alarm device, and the PLC controller is electrically connected to a touch screen.

[0007] Further, the PLC controller selects a Siemens S7 - 200PLC controller.

[0008] Preferably, the shear - pin signal acquisition module includes multiple outlet relays, and each outlet relay is arranged on an independent guide - vane auxiliary crank arm to collect the signal of the shear pin being cut; the multiple outlet relays are all electrically connected to a signal acquisition device, and the signal acquisition device is electrically connected to the input end of the PLC controller.

[0009] Further, the outlet relay selects an outlet relay with the model YSA - SS - 124L, and sends the action state and normal state signals of the shear pin to the signal acquisition device in the form of switch quantities.

[0010] Further, the signal acquisition device selects a multi - channel signal acquisition device with the model DAM - 3232M, which is used to collect the switch - quantity signals sent by the outlet relays, convert them into digital signals, and then transmit them to the PLC controller.

[0011] Preferably, the alarm device includes an audible and visual alarm.

[0012] Preferably, the touch screen is electrically connected to both the input end and the output end of the PLC controller; there are status indicators and numbers of multiple outlet relays arranged on the surface of the touch screen; a fault reset button is arranged on the surface of the touch screen.

[0013] Further, the touch screen selects a domestic self - controllable liquid - crystal touch screen. The states of the 1# - 24# shear pins are displayed on the liquid - crystal touch screen, and it has the functions of action recording and viewing; the indicators use red and green to represent the action and normal corresponding states of the 1# - 24# shear pins respectively.

[0014] The beneficial effects of the utility model are as follows:

[0015] The device improves the processing efficiency of the shear pin shear travel switch fault defects, saves time costs, solves the problem that the instantaneous accidental faults of the shear pin shear travel switch cannot be located, improves the safety and stability of the equipment, solves the problems that the monitoring device of the existing technology cannot locate the specific fault point, the fault signal cannot be self-held, and there is a lack of fault indication, and has the characteristics of being able to capture the position of the misoperation signal and save historical data, and can accurately locate the fault point. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0017] Figure 1 is a schematic structural connection diagram of the present utility model;

[0018] Figure 2 is a schematic external structure diagram of the present utility model;

[0019] Figure 3 is a circuit diagram for collecting shear pin signals of the prior art in the background art of the present utility model;

[0020] Figure 4 is a schematic flow diagram in the specific implementation of the present utility model;

[0021] In the figure: 24VDC power supply 1, PLC controller 2, signal acquisition module 3, alarm device 4, touch screen 5, status indicator light 6, fault reset button 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiment 1:

[0023] As Figure 1 shown, an intelligent monitoring device for shear pin shear signals includes a 24VDC power supply, and the 24VDC power supply is electrically connected to the input end of the PLC controller 2; the PLC controller 2 is electrically connected to the shear pin signal acquisition module 3; the output end of the PLC controller 2 is electrically connected to the alarm device 4, and the PLC controller 2 is electrically connected to the touch screen 5.

[0024] Furthermore, the PLC controller 2 is a Siemens S7-200 PLC controller 2.

[0025] Preferably, the shear pin signal acquisition module 3 includes a plurality of outlet relays, and each outlet relay is arranged on an independent guide vane auxiliary crank arm for collecting shear pin shear signals; the plurality of outlet relays are all electrically connected to the signal acquisition device, and the signal acquisition device is electrically connected to the input end of the PLC controller 2.

[0026] Further, an outlet relay with the model number YSA-SS-124L is selected, and the action status and normal status signals of the shear pin are sent to the signal acquisition device in the form of switch quantities.

[0027] Further, a multi-channel signal acquisition device with the model number DAM-3232M is selected as the signal acquisition device, which is used to collect the switch quantity signals sent by the outlet relay, convert them into digital signals, and then transmit them to the PLC controller 2; the interface of the signal acquisition device is set on the back of the device shell for wiring.

[0028] Preferably, the alarm device 4 includes an audible and visual alarm.

[0029] As Figure 2 shown, the touch screen 5 is electrically connected to both the input end and the output end of the PLC controller 2; a plurality of status indicators 6 and numbers of the outlet relay are arranged on the surface of the touch screen 5; a fault reset button 7 is arranged on the surface of the touch screen 5.

[0030] Further, the touch screen 5 is a domestic independent and controllable liquid crystal touch screen 5. The states of the 1#-24# shear pins are displayed on the liquid crystal touch screen 5, and it has the functions of action record and viewing; the indicator lights use red and green to represent the action and normal corresponding states of the 1#-24# shear pins respectively.

[0031] Embodiment 2:

[0032] As Figure 4 shown, the control logic of this device is as follows:

[0033] 1. Determine the action status of each shear pin respectively.

[0034] 2. Comprehensively determine the system status. Respectively determine the action status of each shear pin. If all shear pins are in the non-action state, it is determined that the shear pin system is in the normal state; if any shear pin is in the action state, it is determined that the shear pin system is in the action state, and the action number, frequency and time are recorded.

[0035] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An intelligent monitoring device for shear pin shearing signal, characterized in that: The device comprises a 24VDC power supply (1), the 24VDC power supply (1) being electrically connected to an input end of a PLC controller (2); the PLC controller (2) being electrically connected to a shear pin signal acquisition module (3); the output end of the PLC controller (2) being electrically connected to an alarm device (4); and the PLC controller (2) being electrically connected to a touch screen (5).

2. The shear pin shear signal intelligent monitoring device according to claim 1, characterized in that: The shear pin signal acquisition module (3) comprises a plurality of output relays, each of which is arranged on an independent guide vane auxiliary arm and is used to collect the shear pin shear signal; the plurality of output relays are electrically connected to the signal acquisition device, and the signal acquisition device is electrically connected to the input end of the PLC controller (2).

3. The shear pin shearing signal intelligent monitoring device according to claim 1, characterized in that: The alarm device (4) comprises an audible and visual alarm.

4. The shear pin shearing signal intelligent monitoring device according to claim 1, characterized in that: The touch screen (5) is electrically connected to the input end and the output end of the PLC controller (2); the surface of the touch screen (5) is provided with a plurality of output relay status indicator lights (6) and numbers; the surface of the touch screen (5) is provided with a fault reset button (7).

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