Synchronously controlled hydraulic system for attachment of forklift truck

Abstract

The invention relates to a synchronously controlled hydraulic system for an attachment of a forklift truck, and belongs to the technical field of forklift trucks. The synchronously controlled hydraulic system comprises an oil tank, an oil pump, a multi-way valve, a right fork pitch adjusting oil cylinder and a left fork pitch adjusting oil cylinder, wherein the multi-way valve comprises a first attachment reversing valve plate, a second attachment reversing valve plate and a safety valve; the first attachment reversing valve plate and the second attachment reversing valve plate are connected in parallel; an oil inlet P1 of the multi-way valve is divided into two paths; one path is connected to an inlet of the safety valve; an outlet of the safety valve is connected to the oil tank; the other path is connected to oil inlets of the first attachment reversing valve plate and the second attachment reversing valve plate which are connected in parallel; a synchronization valve is additionally arranged and is a flow splitting and concentration valve; when oil enters an inlet P of the synchronization valve, oil simultaneously goes out of a first working oil port A and a second working oilport B, and thus, the flow splitting effect is achieved; when oil simultaneously enters the first working oil port A and the second working oil port B of the synchronization valve, the oil goes out ofthe inlet P, and thus, the flow concentration effect is achieved. The synchronously controlled hydraulic system can not only realize the side shift of a pair of forks, but also realize the synchronous pitch adjustment of the pair of forks.

Description

technical field [0001] The invention belongs to the technical field of forklifts, and in particular relates to a hydraulic system of a forklift attachment. Background technique [0002] Forklifts mainly use forks to pick up materials and realize material handling. Forklifts are usually configured with different attachments to expand the range of use of the forklift to meet the requirements of different working environments. The side shift distance adjusting fork is a commonly used attachment for forklifts. It supplies oil to the adjustment cylinder through a multi-way valve, and pushes the fork to realize the left and right side shift of the fork and the adjustment of the distance between a pair of forks. The existing hydraulic system for side-shifting and distance-adjusting forks has the following disadvantages: 1. The lateral movement of the fork needs to be controlled by a separate oil cylinder, and two oil cylinders are set up for control of the distance adjustment. The...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of sideways movement of a pair of forks, complex distance adjustment structure, and asynchronous movement, the present invention provides a synchronously controlled forklift attachment hydraulic system

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