CN-122012850-A - Operation control device and control method for fan-shaped ash scraper

Abstract

The invention relates to the technical field of converter steelmaking flue gas purification equipment, in particular to an operation control device of a fan-shaped ash scraper, when a motor drives the fan-shaped ash scraper to move in a forward and reverse direction through a main speed reducer, the main speed reducer drives a limit sensing piece to rotate through a main speed reducer, a first limit sensing rod is arranged on the limit sensing piece, a first mounting groove is arranged on a proximity switch bracket, the first limit sensing rod swings in the first mounting groove, a left-in-place proximity switch is arranged at the left end of the first mounting groove, a right-in-place proximity switch is arranged at the right end of the first mounting groove, a second limit sensing rod is also arranged on the limit sensing piece, a second mounting groove is also arranged on the proximity switch bracket, the second limit sensing rod swings in the second mounting groove, a left-limit proximity switch is arranged at the left end of the second mounting groove, and a right-limit proximity switch is arranged at the right end of the second mounting groove. The invention also relates to a control method of the fan-shaped ash scraper operation control device.

Inventors

• LIU YANBING
• TANG ZHIYUN
• ZHANG BINGLIN
• LI SHUANG
• ZHAO KUN
• WU HAO
• DONG ZHIHUI

Assignees

• 山西太钢不锈钢股份有限公司

Dates

Publication Date

20260512

Application Date

20260319

Claims (3)

1. 1. The fan-shaped ash scraper operation control device is characterized in that a second limit induction rod is further installed on the limit induction piece, a second installation groove is further arranged on the limit induction piece, the second limit induction rod swings in the second installation groove, a left limit proximity switch is installed at the right end of the second installation groove, a right limit proximity switch is installed at the right end of the second installation groove, and a left limit proximity switch, a right limit proximity switch and a motor electrical signal are connected with a PLC.
2. 2. The operation control device of the fan-shaped ash scraper of claim 1, wherein the proximity switch support is a double-limit control device, the double-limit control device is a door opening installation structure prepared by strip steel, two parallel arc-shaped notches are formed in the top of the door opening installation structure, one of the arc-shaped notches is a first installation groove, the other arc-shaped notch is a second installation groove, the end parts of the first installation groove and the second installation groove are flat and have no burrs, and limit adjustment allowance is reserved for the length.
3. 3. A control method of a fan-shaped ash scraper operation control device as set forth in claim 1, comprising the following steps S1, normally reciprocating operation, namely, a PLC (programmable logic controller) controls a motor to start positively, when a first limit induction rod triggers a left-in-place proximity switch, the left-in-place proximity switch sends a left-in-place signal to the PLC, the PLC controls the motor to stop, the motor is reversely started after delay, when the first limit induction rod triggers a right-in-place proximity switch, the right-in-place proximity switch sends a right-in-place signal to the PLC, and the motor stops and is reversely rotated again after delay, so that the cycle is performed; S2, limit position protection, namely when a left-in-place proximity switch or a right-in-place proximity switch fails to cause the fan scraper to run continuously beyond a normal position, a second limit sensing rod triggers a corresponding left limit proximity switch or right limit proximity switch, and after the PLC receives a left limit signal or a right limit signal sent by the left limit proximity switch or the right limit proximity switch, an emergency stop instruction is immediately sent out by a phase motor, and then the motor is controlled to start in the opposite direction to enable the fan scraper to return to a safety area; And S3, signal interlocking and fault diagnosis, namely setting interlocking logic in a PLC program, wherein the left-in-place signal, the right-in-place signal, the left limit signal and the right limit signal are continuously monitored, if two signals which are mutually exclusive in theory are detected, the system logic error or the hardware fault is judged, the PLC immediately sends an interrupt instruction to enable the motor to stop emergently, an alarm is triggered, and an operator is reminded to check, and the two signals which are mutually exclusive in theory comprise the left-in-place signal and the right limit signal which are received in set time and the right-in-place signal and the left limit signal which are received in set time.

Description

Operation control device and control method for fan-shaped ash scraper Technical Field The invention relates to the technical field of converter steelmaking flue gas purification equipment, in particular to an operation control device and a control method for a fan-shaped ash scraper of an electric dust collector in a converter dry dust removal system, which are particularly suitable for precise control and safety protection of reciprocating operation of the fan-shaped ash scraper. Background In the dry dedusting process of the converter, the electric dust remover is core equipment for fine dedusting, and a fan-shaped ash scraper (hereinafter referred to as fan scraping) is responsible for removing dust deposited on an anode plate, so that the reliability of reciprocating circulating operation of the electric dust remover is directly related to the stability of the electric dust remover and even the whole converter production. The traditional fan scraper adopts a single limiting control mode, namely, a main reducer connected through a main reducer drives a limiting sensing piece to rotate, a single sensing rod on the sensing piece triggers a single in-place proximity switch on a proximity switch bracket, so that the forward and reverse rotation of the main reducer is controlled, and the reciprocating operation of the fan scraper is realized. However, the single limit control has the obvious defect that once the in-place proximity switch fails due to loosening, damage or induction rod fault, the PLC cannot receive a running direction switching signal, so that the fan-scraper motor continuously runs in one direction. The sector scraper can continue to run to the mechanical limit of the gear ring, so that the phenomena of tooth jump and tooth beating occur, and serious mechanical faults such as tooth breakage of the gear, deformation of the main shaft, bolt fracture of the bearing seat and the like are caused. Such faults all occur in the electric dust collector, and the diagnosis and treatment are required to be stopped and cooled and then enter the equipment for maintenance, so that time and labor are consumed, the converter is stopped in an unscheduled mode, and the continuous production of steel enterprises is greatly influenced, and therefore, a fan-shaped ash scraper operation control scheme capable of fundamentally preventing such single-point failure faults is needed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the fan-shaped ash scraper operation control device, which is provided with the extra-limit protection through hardware redundancy design, realizes fault diagnosis and emergency shutdown by combining software logic interlocking, builds a double safety barrier, effectively prevents equipment damage caused by single limit failure, remarkably improves the reliability and safety of fan-shaped ash scraper operation, and reduces production loss caused by equipment fault. According to the technical scheme, when the motor drives the fan-shaped ash scraper to move in forward and reverse directions through the main speed reducer, the main speed reducer drives the limit sensing piece to rotate through the main speed reducer, the first limit sensing rod is arranged on the limit sensing piece, the first mounting groove is arranged on the proximity switch bracket, the first limit sensing rod swings in the first mounting groove, the left-in-place proximity switch is arranged at the left end of the first mounting groove, the right-in-place proximity switch is arranged at the right end of the first mounting groove, the second limit sensing rod is further arranged on the limit sensing piece, the second mounting groove is further arranged on the proximity switch bracket, the second limit sensing rod swings in the second mounting groove, the left end of the second mounting groove is provided with the left limit proximity switch, the right limit proximity switch is arranged at the right end of the second mounting groove, and the left-in-place proximity switch, the right limit proximity switch and the motor are electrically connected with the PLC. The proximity switch support is a double-limit control device, the double-limit control device is a door opening installation structure prepared by strip steel, two parallel arc-shaped notches are formed in the top of the door opening installation structure, one of the arc-shaped notches is a first installation groove, the other arc-shaped notch is a second installation groove, the end parts of the first installation groove and the second installation groove are smooth and have no burrs, and limit adjustment allowance is reserved in length. A control method of a fan-shaped ash scraper operation control device comprises the following contents S1, normal reciprocating operation, namely, a PLC controls a motor to start positively (anticlockwise or clockwise is set to be positively by people, the left swing of a first limit sensing rod