CN-121990427-A - Automatic cable recovery control system for overhaul of thermal power plant

CN121990427ACN 121990427 ACN121990427 ACN 121990427ACN-121990427-A

Abstract

The invention discloses an automatic cable recovery control system for overhaul of a thermal power plant, and relates to the technical field of cable overhaul of the thermal power plant. The invention greatly improves the maintenance operation efficiency of the power plant, realizes the automatic telescopic recovery of the cable, can complete the whole-flow operation by a single person, saves the labor cost, flexibly adapts to multiple operation scenes by the movement of equipment, avoids the damage of the cable, reduces the damage rate, prolongs the service life by the tension self-adaptive winding and the accurate length metering locking, is compatible with the cables with multiple specifications, improves the universality of the equipment, simultaneously integrates a multiple safety protection structure, greatly reduces the safety risk of the field operation, and has the advantages of accurate control, simple and convenient operation and visual state, and comprehensively ensures the high efficiency, safety and convenience of the maintenance operation.

Inventors

ZHOU YUFEI
LIU QUNFENG
WANG KUN
DU HAO
ZHANG CHENG
Sun Gaigai

Assignees

大唐三门峡电力有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260403

Claims (10)

1. The automatic cable recovery control system for overhaul of the thermal power plant is characterized by comprising a main body frame, a power supply module, an automatic telescopic recovery module, a guiding and protecting module, an operation control module and a PLC (programmable logic controller), wherein the PLC is respectively and electrically connected with the main body frame, the power supply module, the automatic telescopic recovery module, the guiding and protecting module and the operation control module to realize linkage control of all the modules; the main body frame and the power supply module provide mounting foundation, power supply and moving functions for the device, the shell of the device is of an insulating protection structure, a power supply assembly is built in the device, a moving fixing structure is arranged at the bottom of the device, and adjustable armrests are arranged at two sides of the device; the automatic telescopic recovery module is a device core execution module and comprises a power mechanism, a clutch control assembly, a tension monitoring assembly and a length metering assembly, so that the non-resistance pulling out, power driving recovery, tension self-adaptive adjustment and length accurate metering of the cable are realized; the guiding and protecting module comprises a guiding component and a safety protecting component, plays a role in guiding and restraining cable winding and unwinding, and realizes multiple safety protection of preventing false touch, overload clamping stagnation and winding; The operation control module is provided with a man-machine interaction interface for realizing parameter setting, mode switching, state display and instruction input of the equipment, and the output end of the operation control module is electrically connected with the PLC controller, receives an operation instruction and transmits the operation instruction to the PLC controller; The PLC controller is used as a control core, receives the collected data of the tension monitoring assembly and the length measuring assembly and the instruction signals of the operation control module, outputs control instructions to each execution module after operation processing, and feeds back equipment state data to the operation control module.
2. The automatic recovery control system for the cable for overhauling the thermal power plant according to claim 1, wherein a breaker and a leakage protector are arranged in a power supply assembly of the main body frame and the power supply module, an industrial-level protection plug is arranged at the input end, a plurality of power supply sockets with misplug prevention dust covers are arranged at the output end, state signals of the breaker and the leakage protector are transmitted to a PLC (programmable logic controller), the PLC only allows the automatic telescopic recovery module to be started when the breaker and the leakage protector are closed, and the movable fixing structure is a universal wheel with a brake function.
3. The automatic cable recovery control system for overhaul of a thermal power plant according to claim 1, wherein the power mechanism of the automatic telescopic recovery module comprises a servo motor and a speed reducer, the servo motor is in transmission connection with the speed reducer, the speed reducer is in transmission connection with a reel spindle, the reel adopts a replaceable structure, a cable clamping groove is formed in the inner wall of the reel, the servo motor supports dual-mode switching of a position mode and a speed mode, the speed mode is adopted during recovery, the position mode is adopted during pulling limiting, and the PLC controller outputs a rotating speed adjusting instruction to the servo motor to realize dynamic control of the winding speed.
4. The automatic cable recovery control system for overhaul of a thermal power plant according to claim 1, wherein the clutch control assembly of the automatic telescopic recovery module is connected with the reel spindle and is electrically connected with the PLC, when the cable is pulled out, the PLC controls the clutch control assembly to be disconnected and separated, so that the power mechanism is disconnected from the reel spindle, the cable can be pulled out independently, and when the cable is recovered, the PLC controls the clutch control assembly to be electrified and attracted, so that the power mechanism drives the reel spindle to rotate through the speed reducer, and power recovery of the cable is realized.
5. The automatic cable recovery control system for overhaul of a thermal power plant according to claim 1, wherein the tension monitoring assembly of the automatic telescopic recovery module comprises symmetrically arranged tension sensors, the tension sensors are in communication connection with a PLC (programmable logic controller) to transmit real-time cable tension data to the PLC at preset frequency, the PLC is internally provided with a tension self-adaptive algorithm, the target winding speed of a servo motor is calculated through a formula, and closed-loop control of the tension and the winding speed is realized, wherein the formula is as follows: ; Wherein, the For the target winding speed of the servo motor, Is used as a reference speed of the motor, In order to adjust the coefficient of the velocity, For the cable tension value acquired by the pressure sensor in real time, The upper limit reference value of the safety tension of the cable is obtained.
6. The automatic cable recovery control system for thermal power plant maintenance according to claim 5, wherein the PLC receives tension data every 0.1s and substitutes the tension data into formula operation, and simultaneously sets tension threshold control logic as follows: When (when) When the PLC controller will Down to Triggering an alarm; When (when) When the PLC controller will Rise to ; When (when) When the PLC controller maintains ; And The cable diameter is larger according to the specification of the cable, The greater the value.
7. The automatic recovery control system for cables for overhaul of a thermal power plant according to claim 1, wherein the length metering assembly of the automatic telescopic recovery module comprises an encoder coaxially connected with a reel spindle, the encoder is connected with a high-speed counter interface of a PLC (programmable logic controller), the PLC calculates the actual pulled-out length of the cables through the accumulated pulse number of the encoder, and the length calculation formula is as follows: ; Wherein, the For the actual pull-out length of the cable, The number of pulses is accumulated for the encoder, For the effective diameter of the spool to be the same, In order for the encoder resolution to be high, Is the transmission ratio of the speed reducer.
8. The automatic cable recovery control system for thermal power plant maintenance according to claim 7, wherein said operation control module supports a preset pull-out length of the input cable , The cable is stored in an internal register of the PLC, and the PLC is connected with the cable in real time in the cable pulling process And (3) with Comparing; When (when) When the speed of the servo motor is reduced, the PLC outputs a speed reducing signal; When (when) = When the clutch control assembly is in a closed state, the PLC controller simultaneously controls the clutch control assembly to be completely sucked and the servo motor to be suddenly stopped, so that the accurate locking of the cable length is realized; Can be input again through the operation control module during unlocking Or pressing the unlock key.
9. The automatic cable recovery control system for overhauling a thermal power plant according to claim 1, wherein the guiding assembly of the guiding and protecting module comprises a rotatable guiding bracket and a guiding wheel set arranged on the bracket, and the width of a wheel groove of the guiding wheel set is adjustable and is suitable for cables with different specifications; The safety protection assembly comprises an error touch prevention structure, an overload clamping stagnation protection structure and an anti-winding baffle plate, and multiple safety protection in the cable winding and unwinding process is realized.
10. The automatic cable recovery control system for overhauling a thermal power plant according to claim 1, wherein the man-machine interaction interface of the operation control module comprises a display screen, function keys and a status indicator lamp, equipment parameter setting, working mode switching and running state visual display are achieved, and the PLC synchronizes sensor acquisition data and equipment state data to the display screen in real time and supports uploading of the data to an external management system.

Description

Automatic cable recovery control system for overhaul of thermal power plant Technical Field The invention relates to the technical field of cable overhaul of a thermal power plant, in particular to an automatic cable recovery control system for overhaul of a thermal power plant. Background Temporary power sources are frequently used in a power plant overhaul field, most of the existing power supply equipment is a traditional power supply disc, the reels are manually stirred after cables are pulled out, and obvious pain points exist in that the maintenance operation is needed to be suspended during single operation, and the cable is specially recovered, so that the efficiency is low; When a plurality of persons cooperate, the additional arrangement personnel are required to stir the reel, which wastes labor cost, and the uneven manual stirring force causes the cable to be wound loosely, knotted and wound, and even causes the abrasion of an insulating layer; The cable pulling-out length cannot be accurately controlled, the winding equipment is easy to drag due to overlong length, the operation range is affected due to overlong length, the cable lacks guide constraint in the recovery process, the cable is easy to scratch with the electrified equipment of the power plant, and potential safety hazards exist. In the prior art, the common automatic winding roll is designed for civil small-specification cables, so that the power output of large-section cables of an electric power plant is not suitable, the core requirements of tension control, safety protection and the like of a maintenance site are not met, meanwhile, the support of a clear PLC control algorithm is not available, the accurate tension adjustment and length locking cannot be realized, and the complex operation environment of the electric power plant cannot be adapted. Disclosure of Invention The invention aims to solve the problems that the traditional power supply equipment cable for power plant overhaul is dependent on manual work, is easy to wind and damage, is inaccurate in length and tension control, and is insufficient in power of a civil automatic winding roll, free of adaptive safety protection and algorithm support and incapable of meeting the complex overhaul operation requirement of a power plant. The invention adopts the following technical scheme for realizing the purposes: The automatic cable recovery control system for overhaul of the thermal power plant comprises a main body frame, a power supply module, an automatic telescopic recovery module, a guiding and protecting module, an operation control module and a PLC (programmable logic controller), wherein the PLC is electrically connected with the main body frame, the power supply module, the automatic telescopic recovery module, the guiding and protecting module and the operation control module respectively, so that linkage control of the modules is realized; the main body frame and the power supply module provide mounting foundation, power supply and moving functions for the device, the shell of the device is of an insulating protection structure, a power supply assembly is built in the device, a moving fixing structure is arranged at the bottom of the device, and adjustable armrests are arranged at two sides of the device; the automatic telescopic recovery module is a device core execution module and comprises a power mechanism, a clutch control assembly, a tension monitoring assembly and a length metering assembly, so that the non-resistance pulling out, power driving recovery, tension self-adaptive adjustment and length accurate metering of the cable are realized; the guiding and protecting module comprises a guiding component and a safety protecting component, plays a role in guiding and restraining cable winding and unwinding, and realizes multiple safety protection of preventing false touch, overload clamping stagnation and winding; The operation control module is provided with a man-machine interaction interface for realizing parameter setting, mode switching, state display and instruction input of the equipment, and the output end of the operation control module is electrically connected with the PLC controller, receives an operation instruction and transmits the operation instruction to the PLC controller; The PLC controller is used as a control core, receives the collected data of the tension monitoring assembly and the length measuring assembly and the instruction signals of the operation control module, outputs control instructions to each execution module after operation processing, and feeds back equipment state data to the operation control module. Further, the circuit breaker and the leakage protector are arranged in the main body frame and the power supply assembly of the power supply module, the input end is provided with an industrial protection plug, the output end is provided with a plurality of power supply sockets with anti-misplug dustproof covers, state sign