Device and method for preventing rotary mechanism from automatically rotating

Abstract

The invention relates to a device for preventing a rotary mechanism from automatically rotating. The rotary mechanism comprises a rotary handle, an oil tank, a rotary brake (7), a rotary motor (6) and five oil holes (C-G), which form a hydraulic oil path. The device is characterized by comprising an electric proportion reducing valve (Y1), a switch valve (Y2) and a first hydraulic control part (3), wherein the first hydraulic control part (3) is arranged in the oil path from a first port (A) to the second oil hole (D), the electric proportion reducing valve (Y1) and the switch valve (Y2) are serially arranged in the oil path from the first oil hole (C) to the second oil hole (E), and the initial stages of the electric proportion reducing valve (Y1) and the switch valve (Y2) are electrically neutral stages. In addition, the invention also relates to a method for preventing the rotary mechanism from automatically rotating, and a crane comprising the device for preventing the rotary mechanism from automatically rotating.

Description

technical field [0001] The present invention relates to a device and a method for preventing automatic rotation of a slewing mechanism of a crane or the like, and in particular the invention also relates to a crane comprising the device. Background technique [0002] Solving the problem of automatic rotation of the slewing mechanism is an important problem that every hydraulic designer must face. On the existing hoisting machinery, with the increase of tonnage, the length and weight of the outrigger are also increasing, so it is inevitable that the outrigger has a certain side bend, so there is a horizontal axis with the center of rotation as the axis. Center, the projected length of the outrigger on the horizontal plane is the torque of the force arm; this leads to the phenomenon that the slewing mechanism automatically rotates when the slewing brake is turned on and the slewing handle is not actuated, and the lighter ones bring great harm to the user when installing the wo...

AI Technical Summary

Problems solved by technology

On the existing hoisting machinery, with the increase of tonnage, the length and weight of the outrigger are also increasing, so it is inevitable that the outrigger has a certain side bend, so there is a horizontal axis with the center of rotation as the axis. Center, the projected length of the outrigger on the horizontal plane is the torque of the force arm; this leads to the phenomenon that the slewing mechanism automatically rotates when the slewing brake is turned on and the slewing handle is not actuated, and the lighter ones bring great harm to the user when installing the workpiece Difficult, severe ones can lead to serious safety accidents

This phenomenon is more obvious when the crane is in the hoisting state, which will eventually bring great difficulties and dangers to the installation of the hoisted object.

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