CN220467368U - Main lifting delay protection circuit of bridge crane - Google Patents

Abstract

The utility model discloses a main lifting delay protection circuit of a bridge crane, which is additionally provided with a phase-change delay protection device, wherein the phase-change delay protection device comprises two delay contacts LAD R0 0-30s; two intermediate relays CAD 50 m7c; the length of the mounting guide rail is 20mm; the 10 m single-core insulated wire YC1 is 2.5mm, so that the phase-change delay is put into use, the coil of the contactor is connected with a forward and reverse delay relay coil in parallel, a forward delay protection and a reverse delay protection are connected, the forward delay protection relay is used as a base coil to be connected with the forward contactor in parallel for synchronous power supply, the reverse delay relay is used as a base to be connected with the reverse contactor coil in parallel for synchronous action, and a delay contact is buckled on the corresponding relay to realize the forward and reverse interlocking protection to be connected in series with a forward and reverse control single-loop circuit to ensure the delay action.

Description

Main lifting delay protection circuit of bridge crane

Technical Field

The utility model relates to a main lifting delay protection circuit of a bridge crane.

Background

The delay protection is widely applied to the field of bridge cranes and is an indispensable part in industrial manufacturing protection. The device has the main function of preventing the three-stage tripping accident of overcurrent of equipment due to the fact that the contactor is not effectively extinguished after being released due to the protection of ascending two-gear reverse connection during the reverse driving or descending during the operation. In the prior art, bridge cranes for steelmaking are mostly controlled by contactors to complete the commutation or speed change control of travelling cranes, and the travelling cranes with frequent actions lacking commutation delay protection are frequently adhered due to different operation methods of control often appearing due to personal operation differences, so that the service lives of a large number of online commutation control contactors are shortened. Therefore, the phase change delay protection of the contactor in the lifting mechanism of the bridge crane is a problem to be solved urgently.

Disclosure of Invention

The utility model aims to provide a main lifting delay protection circuit of a bridge crane, which can prevent three-stage tripping of a circuit breaker or contact adhesion failure of an overcurrent contactor caused by no effective arc extinction and no delay protection in the process of commutation or stopping of a contactor-controlled commutation motor.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows: a main lifting delay protection circuit of a bridge crane is characterized in that a phase-change delay protection device is additionally arranged in the circuit, and the circuit comprises two delay contacts LAD R0 0-30s; two intermediate relays CAD 50 m7c; the length of the mounting guide rail is 20mm; the 10 m single-core insulated wire YC1 is 2.5mm, so that the phase-change delay is put into use, the coil of the contactor is connected with a forward and reverse delay relay coil in parallel, a forward delay protection and a reverse delay protection are connected, the forward delay protection relay is used as a base coil to be connected with the forward contactor in parallel for synchronous power supply, the reverse delay relay is used as a base to be connected with the reverse contactor coil in parallel for synchronous action, and a delay contact is buckled on the corresponding relay to realize the forward and reverse interlocking protection to be connected in series with a forward and reverse control single-loop circuit to ensure the delay action.

Compared with the prior art, the utility model has the advantages that: the utility model can effectively delay in the lifting protection of the steelmaking bridge crane, realizes reverse connection after the contactor is extinguished, is beneficial to personnel operation in the production process, prevents the contactor from being stuck or falling or overlarge current in the phase change process, causes three-stage tripping of the circuit breaker, prolongs the service life of the contactor after the delay protection is additionally arranged on the contactor, and reduces the equipment failure rate.

Drawings

Fig. 1 is a schematic diagram of the protection circuit of the present utility model after installation.

Fig. 2 is a schematic diagram of the protection wiring of the present utility model.

Description of the embodiments

The main lifting delay protection circuit of the bridge crane is provided with a phase-change delay protection device as shown in figures 1 and 2, and comprises two delay contacts LAD 0 0-30s; two intermediate relays CAD 50 m7c; the length of the mounting guide rail is 20mm; the 10 m single-core insulated wire YC1 is 2.5mm, so that the phase-change delay is put into use, the coil of the contactor is connected with a forward and reverse delay relay coil in parallel, a forward delay protection and a reverse delay protection are connected, the forward delay protection relay is used as a base coil to be connected with the forward contactor in parallel for synchronous power supply, the reverse delay relay is used as a base to be connected with the reverse contactor coil in parallel for synchronous action, and a delay contact is buckled on the corresponding relay to realize the forward and reverse interlocking protection to be connected in series with a forward and reverse control single-loop circuit to ensure the delay action.

The protection implementation process of the utility model is as follows: the 20cm guide rail prepared is arranged in the main lifting distribution board cabinet of the bridge crane, the two intermediate relays ZC1 and FC1 are arranged on the guide rail, when the inspection schematic diagram shown in figure 1 is consistent with the on-site real object wiring, wiring is carried out according to the wiring diagram 2, the main power supply is not needed to be sent after the inspection is error-free, the control loop power supply is only sent, the single machine test is carried out, the time delay contact time can be adjusted to confirm that the time delay input is reliable and effective, the time is adjusted to 0.4 second, and the main power supply can be sent to carry out the electrified load test. The existing part of bridge cranes are technically improved due to frequent tripping of the circuit breaker, the use effect is good, the equipment accident rate is greatly reduced, the service life of the on-line contactor is prolonged, and the three-level tripping accident of the bridge cranes caused by reverse connection or reverse vehicle action is controlled.

Claims (1)

1. A main lifting delay protection circuit of a bridge crane is characterized in that a phase-change delay protection device is additionally arranged in the circuit, and the circuit comprises two delay contacts LAD R0 0-30s; two intermediate relays CAD 50 m7c; the length of the mounting guide rail is 20mm; the 10 m single-core insulated wire YC1 is 2.5mm, so that the phase-change delay is put into use, the coil of the contactor is connected with a forward and reverse delay relay coil in parallel, a forward delay protection and a reverse delay protection are connected, the forward delay protection relay is used as a base coil to be connected with the forward contactor in parallel for synchronous power supply, the reverse delay relay is used as a base to be connected with the reverse contactor coil in parallel for synchronous action, and a delay contact is buckled on the corresponding relay to realize the forward and reverse interlocking protection to be connected in series with a forward and reverse control single-loop circuit to ensure the delay action.