Six-bar mechanism of dumper lifting device

Abstract

The invention provides a six-bar mechanism of a dumper lifting device. The six-bar mechanism of the dumper lifting is capable of completing functions of door opening, unloading, locking and the like through utilization of only one group of big oil cylinders and comprises a frame, a box body, a box door, an oil cylinder, a lifting arm, a door opening arm and a locking bar. The top end of the lifting arm is hinged with a corner position, far away from an overturn shaft, of the box body through a lifting shaft, and the top end of the oil cylinder is hinged with the upper section, close to the lifting shaft, of the lifting arm. The upper portion of the door opening arm is fixed on the end portion of the box door. Two ends of the locking bar are respectively hinged with the tail end of the lifting arm and the lower portion of the door opening arm. The six-bar mechanism in planar motion is formed. In a non-pressure state, the box body is flatly fallen, and the box door is closed. When a small amount of oil is fed, the box door is totally opened, and when a large amount of the oil is fed, the box body turns over and unloads. When the oil cylinder contracts to be the shortest length, pressure is relieved, a hinge joint of the tail end of the lifting arm is located below the connection line of an axial point of the lifting shaft and a hinged joint of the tail end of the door opening arm, the box door is self locked on the box body, and systematic pressure maintaining is not needed. Hydraulic control systems are simplified and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of dump trucks, in particular to a dump truck lifting device, and more specifically to a link mechanism applied to the dump truck lifting device. Background technique [0002] At present, in the domestic semi-trailer rollover dump truck industry, the structure of independent hydraulic cylinder control is commonly used, that is, the side opening door uses two small oil cylinders at the front and rear to control the opening and closing of the door independently. It is necessary to maintain a certain pressure to ensure that the side door is closed tightly, and the lifting box is independently controlled by another group of large hydraulic cylinders. The small oil cylinder pushes open the side door --> the large oil cylinder lifts the box --> the large oil cylinder drops the box --> the small oil cylinder closes the side door, and the action control is relatively complicated. [0003] For dump trucks t...

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Problems solved by technology

2. At the same time, the control system is relatively complicated and the product cost is high

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