Crane main beam connecting rod lifting device

Abstract

The invention provides a crane main beam connecting rod lifting device. The crane main beam connecting rod lifting device comprises a base, a bracket, a lead screw, a power driving mechanism, a firstupper connecting rod, a first lower connecting rod, a second upper connecting rod, a second lower connecting rod, a third upper connecting rod and a third lower connecting rod. The bottom end of the first upper connecting rod is hinged to the top end of the first lower connecting rod, and the lead screw straightly moves left and right under the action of the power driving mechanism. The bottom endof the second upper connecting rod and the top end of the second lower connecting rod are hinged to the lead screw at the same time, and the bottom end of the third upper connecting rod and the top end of the third lower connecting rod are hinged to the lead screw at the same time. A parallelogram mechanism is formed by the base, the second lower connecting rod, the third lower connecting rod andthe lead screw, and a parallelogram mechanism is formed by the bracket, the second upper connecting rod, the third upper connecting rod and the lead screw. The crane main beam connecting rod liftingmechanism has the advantages that the connecting rods are hinged, the connecting rods and the other components are hinged, tooth structure do not need to be machined on the connecting rods, and machining and manufacturing are convenient; and meanwhile the problem that the tooth structures are adopted for keeping the synchronization action of the connecting rods, and consequently the use effect ispoor is avoided.

Description

Technical field [0001] The invention relates to a crane main beam connecting rod lifting device. Background technique [0002] The jack is a well-known lifting device, especially the electric scissor jack. It uses a rigid lifting piece as a working device. It lifts heavy objects within the stroke through the top pallet and the bottom base. Heavy equipment. For example, a four-link electric jack (that is, a connecting rod lifting device) disclosed in the Chinese utility model patent with the authorized announcement number CN202107479U includes a bracket, an upper connecting rod, a lower connecting rod, a base, a screw rod, and a pin The column nut, the geared motor, and the upper and lower connecting rods form a four-link mechanism. One end is hinged on the bracket and the other end is hinged on the base; the upper and lower connecting rods on the right are spliced ​​with pin nuts. There is a geared motor at the joint of the upper and lower connecting rods on the left; one end o...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lifting device for the connecting rod of the main girder of a crane, so as to solve the problems that the connecting rod of the connecting rod lifting device in the prior art is difficult to process and the use effect is poor

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