Crane

Abstract

The invention provides a crane, and relates to the technical field of construction machinery. The crane includes a turntable and two sets of counterweight displacement assemblies; the counterweight displacement assemblies include swing frames and linear drive parts. The two swing frames are directly connected to the side walls on the left and right sides of the turntable, and the side walls extendin the front and back directions of the turntable. The two swing frames are used to connect counterweight. The linear drive parts of each group of the counterweight displacement assemblies simultaneously rotate the swinging frames of the same group connected to the turntable, and the linear drive parts of the two sets of the counterweight displacement assemblies are used for driving the two swingframes in an one-to-one corresponding mode to enable the two swing frames to rotate relative to the turntable correspondingly to change the position of the counterweight. According to the crane withthe counterweight displacement assemblies, the problem of super-long structure in the front-rear direction is solved, improving of the adaptability to different working environments is facilitated, and saving of costs is facilitated.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane. Background technique [0002] In order to adjust the counterweight of the crane conveniently, a counterweight displacement component can be installed on the turntable, and the position of the counterweight displacement component relative to the turntable can be changed, thereby changing the position of the counterweight to adjust the center of gravity of the vehicle more flexibly, so as to better adapt to The operation requirements of the crane can improve the safety and stability of the crane. [0003] For example, CN109279521A discloses a counterweight mobile device and a crane. The counterweight frame is installed behind the tail of the turntable. center of gravity. However, since the counterweight frame is connected to the rear of the turntable, that is, the tail of the turntable, the counterweight frame itself needs to occupy an additional space behi...

AI Technical Summary

Problems solved by technology

However, since the counterweight frame is connected to the rear of the turntable, that is, the tail of the turntable, the counterweight frame itself needs to occupy an additional space behind the rear of the turntable, and the connecting component adjusts the position by adjusting the distance between the counterweight and the counterweight frame, thereby When the counterweight moves back and forth, it can only move in the extra space behind the turntable, which may easily cause the structure of the crane to be too long in the front and rear directions.

Moreover, the driving part can only drive the counterweight to move through the transmission assembly composed of multiple connecting rods and the connecting assembly. The structure of the counterweight moving device is complicated, which is not conducive to cost saving

[0004] CN102229415A discloses a crane and a mobile counterweight mechanism. The displacement cylinder drives the connecting frame to drive the counterweight to move. The connecting frame is hinged to the vertical rod and the oblique rod. The vertical rod and the oblique rod are hinged to the hoist box fixed at the tail of the turntable The bracket at the tail of the turret itself needs to occupy the space behind the turntable. In addition, when the counterweight moves back and forth, the bracket at the tail of the winch box is used as the center position. The back and forth movement of the counterweight needs to occupy more space behind the turntable, resulting in the structure in the front and rear directions being difficult. super long

However, the swing arm is installed directly under the driver without other connections and supports, and it is directly driven by the rotary drive to swing, which requires extremely high strength requirements for the drive and swing arm as well as the rotational driving force of the drive, which is not conducive to saving cost

[0006] It can be seen that the structure of existing cranes with counterweight displacement devices tends to be super long in the front and rear directions, which is not conducive to improving the adaptability of the crane to different working environments and is not conducive to saving costs

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