Loading and lifting hydraulic system of semitrailer

Abstract

The invention discloses a loading and lifting hydraulic system of a semitrailer. The system comprises a gooseneck hydraulic system, a power source hydraulic system and a trailer hydraulic system. The power source hydraulic system is connected with the gooseneck hydraulic system and used for providing hydraulic oil needed by work of the gooseneck hydraulic system. A multi-way valve in the gooseneck hydraulic system is connected with a first dual-effect multi-stage oil cylinder and a second dual-effect multi-stage oil cylinder, and separation of a gooseneck from a tractor is achieved through the cooperation of the multi-way valve and a switch ball valve. The multi-way valve is connected with the first dual-effect oil cylinder and the second dual-effect oil cylinder. pitching operation of the gooseneck is achieved through the cooperation of the multi-way valve and the switch ball valve. The trailer hydraulic system is connected with the gooseneck hydraulic system. Multiple single-effect oil cylinders in the trailer hydraulic system are made communicated and matched with the switch ball valve to achieve switching between semitrailer three-point bearing and four-point bearing. The first dual-effect oil cylinder and the second dual-effect oil cylinder are connected with the single-effect oil cylinder in the front of trailer suspension, and different loading modes are selected according to the load and road surface working conditions to achieve fifth round of gooseneck loading.

Description

technical field [0001] The invention relates to the technical field of hydraulic transmission, in particular to a loading and lifting hydraulic system for a semi-trailer. Background technique [0002] The gooseneck of an ordinary semi-trailer is separated from the tractor by hand-cranking the mechanical outriggers with the gooseneck belt. After the outriggers touch the ground, the gooseneck is separated from the tractor. This operation takes a long time and is inefficient. [0003] The suspension of ordinary semi-trailers generally adopts leaf springs, which cannot be lifted independently. The road surface cannot be adjusted through the minimum height, and the road compensation ability is weak. The suspension is prone to overload on rough roads. At the same time, ordinary trailers use leaf spring suspensions. , the bearing center of gravity is fixed, and it cannot adapt to the transportation of goods with different centers of gravity. Customers need to purchase trailers of d...

AI Technical Summary

Problems solved by technology

The radial load of the rear axle of the tractor is determined by the center of gravity of the vehicle and the ground support point of the trailer. Therefore, in order to transport goods with a rearward center of gravity, it is necessary to lengthen the trailer or add additional counterweight to the gooseneck to meet the radial load of the tractor rear axle. Load requirements, this kind of operation increases the weight of the vehicle, increases fuel consumption, and at the same time has a large workload, takes a long time and is inefficient

In addition, for ordinary semi-trailer trains during transportation, since the radial load on the rear axle of the tractor cannot be changed, the rear axle of the tractor is still prone to slipping on bad roads or climbing.

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