Novel lower trolley structure of shipbuilding gantry crane

Abstract

The invention discloses a novel lower trolley structure of a shipbuilding gantry crane, comprising two end beams, wherein the bottoms of the two ends of each end beam are both provided with a travelling mechanism, a lower trolley fixed pulley beam is welded between the two end beams, two main beams and the fixed pulley beam form an H-shaped beam structure, a support is fixed on the lower end surface of the fixed pulley beam, a pulley shaft is fixed on the support, fixed pulleys are arranged on the pulley shaft. According to the invention, the output shaft of a lifting motor is connected with the input shaft of a reducer, the output shaft of the reducer is connected with one end of a floating shaft, the other end of the floating shaft is connected with a small gear, the small gear is engaged with a large gear coaxial with a drum, wherein the reducer is arranged at one end of the lower trolley, the large gear and the small gear are arranged at the other end of the lower trolley, and the lower end surface of the large gear is lower than the upper surface of the lower trolley. The lower trolley structure effectively reduces the self-weight of the trolley, lowers the drum center altimeter lower trolley total height, and can reduce the total length of the lower trolley.

Description

technical field [0001] The invention specifically relates to a lower trolley structure of a crane, in particular to a novel lower trolley structure of a shipbuilding gantry crane. Background technique [0002] The lower trolley in the shipbuilding gantry crane is used to lift heavy objects and move them to the target position, wherein the lower trolley has a lower trolley frame 20, and the lower trolley frame 20 consists of two lower trolley main beams and two end beams It is composed of mutual welding, and the two main girders all carry the load. Two lower trolley fixed pulley beams are welded between the two end beams. The lower trolley fixed pulley 30 is arranged on the two lower trolley fixed pulley beams and is located above the pulley beams. The base of the lower trolley lifting mechanism reel is placed on the two On the root end beam, the traveling mechanism of the lower trolley is respectively placed under the two main beams of the lower trolley, and its structure i...

AI Technical Summary

Problems solved by technology

[0005] 2. The center height of the reel is too high

The vibration generated when the center of the reel base of the lower trolley is relatively high will cause fatigue to the welding joint of the reel base of the lower trolley, which is very unfavorable for the safety of the trolley.

[0006] 3. The total height of the trolley is too high

The fixed pulley of the lower trolley is placed on the fixed pulley beam of the lower trolley, and is located above the pulley beam, because a certain safety distance must be left between the fixed pulley and the reel, which invisibly increases the center height of the reel base of the lower trolley

Moreover, there must be a safe distance between the machine room of the lower trolley and the reel, so the total height of the lower trolley will continue to increase, and the windward side of the machine room of the lower trolley will increase, increasing the running resistance of the lower trolley

The increase in the total height of the lower trolley will lengthen the outriggers of the upper trolley accordingly. In order to increase the stability of the upper trolley outriggers, it is often made very bulky

[0007] 4. The total length of the lower car is too long

The pinion is directly connected to the reducer through the coupling so that they are all located at the same end of the lower trolley frame, thus occupying half of the platform, increasing the length of the lower trolley, reducing the effective stroke of the span range of the lower trolley, and making the gantry crane lower The blind area of ​​the trolley increases

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