Emergency braking system for harvester and braking method thereof

Abstract

The invention discloses an emergency braking system for a harvester. The emergency braking system for the harvester comprises a hydraulic pump. The hydraulic pump is connected with an oil supplementing pump, and an inclined disc of the hydraulic pump is connected with a hydraulic pump servo cylinder. The oil supplementing pump is connected with an oil inlet of a hydraulic pump servo proportion valve through an oil path. An oil tank is connected with an oil outlet of the hydraulic pump servo proportion valve through an oil path. A first cavity of the hydraulic cylinder servo cylinder is connected with a first work oil port of the hydraulic pump servo proportion valve through a third oil path, and a second cavity of the hydraulic cylinder servo cylinder is connected with a second work oil port of the hydraulic pump servo proportion valve through a fourth oil path. The emergency braking system further comprises a two-position two-way electromagnetic valve, a work oil port of the two-position two-way electromagnetic valve is connected with the first cavity of the hydraulic pump servo cylinder through a first oil path, a work oil port on the opposite side of the two-position two-way electromagnetic valve is connected with the second cavity of the hydraulic pump servo cylinder through a second oil path, and the two-position two-way electromagnetic valve is electrically connected with an electric control system. The emergency braking system guarantees that the harvester can still be reliably braked and automatically controlled when the harvester has a circuit fault, so that the operation safety of the harvester is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical braking systems, in particular to an emergency braking system for a harvester. [0002] At the same time, the invention also discloses an emergency braking method for the harvester. Background technique [0003] Harvesting machinery is an indispensable equipment in agricultural production. It can be divided into two types of equipment: traction and self-propelled. Among them, the self-propelled equipment relies on the engine installed on the equipment itself to provide power, and the self-propelled harvester depends on the driving mode of walking. The difference is divided into traditional mechanical drive mode and hydrostatic drive mode. [0004] The transmission part of the existing hydrostatic drive harvester is mainly composed of engine, hydraulic pump, hydraulic motor, solenoid valve, transmission box, drive axle and other parts. The hydrostatic drive harvester is powered by the engine, a...

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Problems solved by technology

[0005] However, the above-mentioned hydrostatic system has the following problems in operation. When braking is required, the hydraulic pump is returned to the center by energizing the normally closed solenoid valve connected to the two ends of the hydraulic pump servo cylinder to achieve braking. If the circuit has poor contact, etc. Fault, the solenoid valve cannot be energized, the swash plate of the hydraulic pump cannot be returned to the center, and the hydraulic pump continues to output power. Although there are brake pads for braking, the output power of the hydraulic pump is greater than the braking force of the brake pads, so the vehicle cannot be braked. There is a very big security risk

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