CN202322063U - Crane safety protection guarantee device - Google Patents

Abstract

The utility model discloses a crane safety protection guarantee device. The crane safety protection guarantee device comprises a programmable logic controller, a control circuit and a flow contactor, wherein the programmable logic controller is connected with the flow contactor through the control circuit. The crane safety protection guarantee device transmits a safety protection device on-off signal to the programmable logic controller through the control circuit and guarantees safe operation of the equipment.

Description

Device is guaranteed in the crane safety protection

Technical field

The utility model relates to a kind of hoisting crane, and device is guaranteed in particularly a kind of crane safety protection.

Background technology

At present, general bridge-type, lifting mechanism of gantry crane, big wheeling mechanism adopt frequency converter and programmable logic controller (PLC) to control, and in control path, moving the lashed cable control path especially often has induction electricity to produce in some occasion.General safety guard make-and-break signal is imported programmable logic controller through control path by the alternating current 220V intermediate relay; Because alternating current 220V intermediate relay coil hold current is less, control path induction electricity voltage is more than 150V usually, and inducing current is during greater than the coil hold current; Safety guard is like the outage of the spacing grade of the limit that hoists; But the intermediate relay of controlling this device still keeps sticking, causes the signal misinformation, and programmable logic controller can not send cutoff command; The suspension hook etc. of hoisting continues up, causes safety misadventures such as steel rope is broken, suspension hook whereabouts.

The utility model content

The utility model technical matters to be solved provides a kind of crane safety protection and guarantees device, and it accurately transfers to programmable logic controller with the safety guard make-and-break signal through control path, guarantees the safe operation of equipment.

For solveing the technical problem; The utility model provides a kind of crane safety protection to guarantee device; It is characterized in that it comprises programmable logic controller, control path, stream contactless switch, programmable logic controller is connected with the stream contactless switch through control path.

The positive progressive effect of the utility model is: the utility model accurately transfers to programmable logic controller with the safety guard make-and-break signal through control path, guarantees the safe operation of equipment.

Description of drawings

Fig. 1 is the functional block diagram of the utility model one embodiment.

The specific embodiment

Lift a preferred embodiment below, and combine accompanying drawing to come the clearer the utility model of intactly explaining.

As shown in Figure 1, the protection of the utility model crane safety guarantees that device comprises programmable logic controller 1, control path 2, stream contactless switch 3, and programmable logic controller 1 is connected with stream contactless switch 3 through control path 2.The utility model accurately transfers to programmable logic controller with the safety guard make-and-break signal through control path, guarantees the safe operation of equipment.

Bridge-type, safety of gantry crane fender guard make-and-break signal exist under the induction electricity situation at control path, can accurately be transferred to programmable logic controller, and the device security fender guard is just really played a protective role.In the collection of important safety fender guard make-and-break signal, do not use the less intermediate relay of hold current, and adopt the AC contactor of 9A ~ 12A.Like this; Even in the occasion that has induction electricity to exist, the control path signal of also can therefore not misinformating, inducing current is much smaller than the coil hold current of AC contactor; Safety guard is like the outage of the spacing grade of the limit that hoists; Control the yet outage immediately of ac contactor coil of the 9A ~ 12A of this device, the inducing current in the control path does not have influence to acquisition of signal, can generation signals erroneous judgement and cause accident.This scheme is applied at multiple devices; Bridge-type, the transfer crane of miniature intermediate relay adopted in the collection of original design important safety fender guard make-and-break signal; Once because of above-mentioned reason acquisition of signal mistake wire cable rupture and then the suspension hook accident that drops took place; Good through condition of service after the design improvement, and during analogue designs afterwards, all adopted this programme.Therefore generation signals misinformation phenomenon more not.This conceptual design cost increases less, but efficiently solves the big problem that bridge-type, safety of gantry crane fender guard are reliably guaranteed, be one both economical, practical again safety is guaranteed device.

Though more than described the specific embodiment of the utility model; But those skilled in the art is to be understood that; These only are casehistorys, under the prerequisite of principle that does not deviate from the utility model and essence, can make numerous variations or modification to these embodiments.Therefore, the protection domain of the utility model is limited appended claims.

Claims (1)

1. a crane safety protection is guaranteed to it is characterized in that device, and it comprises programmable logic controller, control path, stream contactless switch, and programmable logic controller is connected with the stream contactless switch through control path.