CN217335064U

CN217335064U - Steel rolling feeding rack double-loop protection system

Info

Publication number: CN217335064U
Application number: CN202123447459.0U
Authority: CN
Inventors: 孙宏亮; 杨俊虎; 张磊; 杨昌峰; 许益锋; 金红梅
Original assignee: Zenith Steel Group Co Ltd; Zenith Steel Group Nantong Co Ltd
Current assignee: Zenith Steel Group Co Ltd; Zenith Steel Group Nantong Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-08-30
Anticipated expiration: 2031-12-31

Abstract

The utility model relates to a double-loop protection system of a steel rolling feeding rack, which comprises a main motor, a first contactor and a second contactor which are arranged in parallel and control the main motor to rotate positively and negatively, wherein a protection contactor is arranged on a circuit between the first contactor, the second contactor and the main motor, and the circuit is connected with a third contactor and a fourth contactor which control the positive and negative rotation of the main motor, and the circuit in front of the protection contactor is provided with a double-power transfer switch, when the main contact of the first contactor or the second contactor is dead-sucked, the frequency sensitive resistor and the main motor can be prevented from being burnt out due to overlarge current by disconnecting the protection contactor, meanwhile, the operation of the main motor is controlled by switching to the third contactor and the fourth contactor through the dual-power transfer switch, and the normal operation and stability of the operation of the feeding rack are ensured by controlling the protection system through the double loops.

Description

Steel rolling feeding rack double-loop protection system

Technical Field

The utility model relates to a steel rolling material loading rack double-circuit protection system.

Background

In the steel rolling process, a feeding rack is used for conveying a steel blank on a cooling bed to a furnace roller way, a control driving mode based on a wound rotor motor rotor loop series frequency sensitive rheostat is adopted, the arc discharge phenomenon of a main contact of a motor control contactor of the feeding rack is serious in daily use, the main contact can be roughened by electric arcs, the risk that the contactor is sucked to be dead exists in equipment operation, once the main contact of a motor of the feeding rack is sucked to be dead, the steel blank on the feeding rack can be jacked by a stop mechanism, and finally, the frequency sensitive resistance current is burnt to be excessive, even the motor is burnt to be damaged, the existing control driving mode only has one loop, once a fault occurs, the steel blank needs to be stopped to be overhauled, and the production rhythm is influenced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: in order to overcome the defects in the prior art, the utility model provides a double-loop protection system for a steel rolling feeding rack, which ensures the normal operation and stability of the feeding rack.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a steel rolling material loading rack double loop protection system, is including the main motor of drive material loading rack motion, main motor be connected with the master control return circuit, the master control return circuit has first contactor, the second contactor of the positive and negative rotation of control main motor that sets up in parallel, first contactor, second contactor and main motor between be equipped with protection contactor on the circuit, be equipped with dual power change over switch on the circuit before the protection contactor, be connected with the spare circuit on the circuit before the dual power change over switch, the spare circuit includes third contactor, the fourth contactor of the positive and negative rotation of control main motor that sets up in parallel, when the main contact of first contactor or second contactor appears inhaling the dead condition, dual power change over switch switches to the spare circuit, third contactor, fourth contactor action control main motor operation.

The utility model has the advantages that: the utility model discloses a set up protection contactor and reserve circuit, when the main contact of first contactor or second contactor appears inhaling the phenomenon of dying, in time break off protection contactor to ensure that frequently quick resistance and main motor can not burn out because of the electric current is too big, dual supply change over switch switches to reserve circuit simultaneously, by the operation of third contactor, fourth contactor action control main motor, normal operation and the stability of material loading rack work have been guaranteed to two loop control protection system.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic view of the structural principle of the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

A double-circuit protection system for a steel rolling feeding rack as shown in fig. 1 comprises a main motor M for driving the feeding rack to move, the main motor M is connected with a main control loop, a power supply inlet wire of the main control loop is provided with a first main breaker QS1, the main control loop is provided with a first contactor KM1 and a second contactor KM2 which are arranged in parallel and used for controlling the positive and negative rotation of a main motor M, a protection contactor KM5 is arranged on a line between the first contactor KM1, the second contactor KM2 and the main motor M, a dual-power transfer switch is arranged on a line positioned in front of the protection contactor KM5, a standby loop is connected on the line in front of the dual-power transfer switch, a second main breaker QS2 is arranged on a power inlet wire of the standby loop, the standby loop comprises a third contactor KM3 and a fourth contactor KM4 which are arranged in parallel and used for controlling the positive and negative rotation of the main motor M, and the dual-power transfer switch can be switched between the main control loop and the standby loop.

When the main contact of the first contactor KM1 or the second contactor KM2 is in a dead-suction state, the dual-power transfer switch is switched to a standby loop, and the third contactor KM3 and the fourth contactor KM4 act to control the main motor M to operate.

In the implementation process, the first contactor KM1 and the second contactor KM2 control the main motor M to rotate forward and backward, the protection contactor KM5 added below keeps in a pull-in state all the time, when the operation period of the feeding rack exceeds the set time, a system program does not detect an opening signal of the first contactor KM1 or the second contactor KM2, the program can think that the main contact of the first contactor KM1 or the second contactor KM2 is in a suction state, and the program can timely open the protection contactor KM5 to protect the frequency sensitive resistor and the main motor from being damaged by overcurrent.

When the first contactor KM1 or the second contactor KM2 of the main control loop breaks down, the standby loop can be switched to through the dual-power transfer switch, and the standby loop controls the main motor M to rotate forward and backward through the third contactor KM3 and the fourth contactor KM4, so that a dual-loop protection system is realized, and the normal operation of the feeding rack is ensured.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a steel rolling material loading rack dual-circuit protection system, includes the main motor of drive material loading rack motion, main motor be connected with main control circuit, main control circuit has the first contactor, the second contactor of the positive and negative rotation of control main motor of parallel arrangement, characterized by: the circuit between first contactor, second contactor and the main motor on be equipped with protection contactor, be located and be equipped with dual power change over switch on the circuit before the protection contactor, be connected with the standby circuit on the circuit before the dual power change over switch, the standby circuit is including parallelly connected third contactor, the fourth contactor that sets up control main motor just reversing, when the main contact of first contactor or second contactor appears inhaling the die condition, dual power change over switch switches over to the standby circuit, third contactor, fourth contactor action control main motor operation.