Crane ground operation position limitation control apparatus

Abstract

The present invention belongs to the technical field of crane electrical control, and particularly relates to a crane ground operation position limitation control apparatus, which comprises a control circuit comprising a crane rising contactor auxiliary contact point, a crane descending contactor auxiliary contact point and a heavy hammer position limitation device, wherein the starting button, the stopping button and the main contactor are connected into the control circuit in a series connection manner, the descending contactor contact point and the rising contactor contact point are connected into the self-stick circuit in a parallel connection manner after the descending contactor contact point is connected with the heavy hammer position limitation device in series so as to form the series connection relation with the main contactor contact point, and the crane can normally rise and descent in the case of the normal suction closing of the total contactor KM0. With the crane ground operation position limitation control apparatus of the present invention, the double position limitation control on different broken circuit devices can be achieved, and the crane ground operation position limitation control apparatus has advantages of low cost, simple wiring, accurate control, high safety, easy maintenance, work efficiency improving, and the like.

Description

technical field

[0001] The invention belongs to the technical field of crane electrical control, in particular to a crane ground operation limit control device. Background technique

[0002] Crane is a special high-risk operation equipment. Due to the wide application of foundry cranes in recent years, it is even more important in terms of safety. Especially after the Tieling Crane Incident, the General Administration of Quality Supervision, Inspection and Quarantine has raised the safety requirements for small-tonnage casting cranes below 75 tons to a new level, and changed the QD model to QDY model for small-tonnage foundry cranes below 75 tons, and therefore issued a special A document 375. Among them, Article 4 of Document No. 375 has the relevant provisions, "Double limiters (double limiters) with different forms (usually heavy hammer type and rotary type) are installed at the limit position of the rise, and different circuit breakers should be controlled. , For crane...

Examples

Embodiment 1

[0016] see Figure 1-3 , in the figure, the crane ground operation limit control device of the present invention is a control circuit composed of the auxiliary contact ZC of the lifting contactor of the crane, the auxiliary contact FC of the descending contactor and the limit of the weight. In the case of closing, the crane can be raised and lowered normally.

[0017] When starting, the main contactor KM0 is energized and closed by pressing the start button AN-1 and the stop button AN-2, and through its own normally open contact KM0, the normally closed contact ZC of the rising contactor and the normally closed contactor of the falling contactor The contact and the weight limit series circuit are self-protected and closed. The start button AN-1 can be disconnected.

[0018] The buttons used in the lifting mechanism are equipped with two gears for lifting and lowering. In both directions, the input relays K01-K03 send commands to enter the PLC, calculated by the PLC internal...

technical field

[0001] The invention belongs to the technical field of crane electrical control, in particular to a crane ground operation limit control device. Background technique

[0002] Crane is a special high-risk operation equipment. Due to the wide application of foundry cranes in recent years, it is even more important in terms of safety. Especially after the Tieling Crane Incident, the General Administration of Quality Supervision, Inspection and Quarantine has raised the safety requirements for small-tonnage casting cranes below 75 tons to a new level, and changed the QD model to QDY model for small-tonnage foundry cranes below 75 tons, and therefore issued a special A document 375. Among them, Article 4 of Document No. 375 has the relevant provisions, "Double limiters (double limiters) with different forms (usually heavy hammer type and rotary type) are installed at the limit position of the rise, and different circuit breakers should be controlled. , For crane...

Examples

Embodiment 1

[0016] see Figure 1-3 , in the figure, the crane ground operation limit control device of the present invention is a control circuit composed of the auxiliary contact ZC of the lifting contactor of the crane, the auxiliary contact FC of the descending contactor and the limit of the weight. In the case of closing, the crane can be raised and lowered normally.

[0017] When starting, the main contactor KM0 is energized and closed by pressing the start button AN-1 and the stop button AN-2, and through its own normally open contact KM0, the normally closed contact ZC of the rising contactor and the normally closed contactor of the falling contactor The contact and the weight limit series circuit are self-protected and closed. The start button AN-1 can be disconnected.

[0018] The buttons used in the lifting mechanism are equipped with two gears for lifting and lowering. In both directions, the input relays K01-K03 send commands to enter the PLC, calculated by the PLC internal...

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