Braking system of large-tonnage storage battery forktruck

Abstract

The invention relates to a braking system of a large-tonnage storage battery forktruck. The braking system comprises a service brake, a parking brake and a hydraulic braking system; the hydraulic braking system comprises a brake hydraulic oil tank, an oil pump, an energy accumulator, a charging valve mechanism, a power brake valve and a parking brake valve block. When a vehicle needs to start from a parking braking state, parking braking is released through the energy accumulator and the parking brake valve block; when the vehicle completely stops and needs parking braking, parking braking is implemented through the parking brake valve block; when service braking is needed for the vehicle, service braking is conducted through the energy accumulator and the power brake valve; when service braking is not needed for the vehicle, service braking is released through the power brake valve. In the driving process of the vehicle, when the pressure of the energy accumulator is lower than the pressure set by an energy accumulator low pressure alarm switch of the parking brake valve block, an alarm is triggered by the parking brake valve block; in the state that the energy accumulator is fully charged, the vehicle can implement effective service braking 6-7 times after the vehicle is deenergized; if service braking is conducted continuously, emergency parking braking can be implemented.

Description

technical field [0001] The invention belongs to the technical field of braking of engineering vehicles, and in particular relates to a forklift braking system. Background technique [0002] Large-tonnage battery forklifts refer to four-wheel counterbalanced battery forklifts of more than 6 tons. The multifunctional wet brake integrates the functions of service brake and parking brake. The oil source of the brake system comes from the fixed flow of the hydraulic system. Although the hydraulic system can be simplified and the cost can be reduced, due to the monostable flow, when the brake system When working at high pressure and large flow, it is easy to generate heat. [0003] The cooling and lubricating oil of the wet brake and the oil of the brake system can use different media, and hydraulic oil can also be used as the medium, but the wet brake friction plate is prone to abnormal noise during the braking process, and it is generally found in the cooling and lubricating oi...

AI Technical Summary

Problems solved by technology

The multifunctional wet brake integrates the functions of service brake and parking brake. The oil source of the brake system comes from the fixed flow of the hydraulic system. Although the hydraulic system can be simplified and the cost can be reduced, due to the monostable flow, when the brake system When working at high pressure and large flow, it is easy to generate heat

[0003] The cooling and lubricating oil of the wet brake and the oil of the brake system can use different media, and hydraulic oil can also be used as the medium, but the wet brake friction plate is prone to abnormal noise during the braking process, and it is generally found in the cooling and lubricating oil. Add special anti-wear agent to eliminate noise, but if the brake system oil source is diverted from the hydraulic system, the anti-wear agent addition metering is very large

Small-tonnage battery forklift wet brakes generally use self-cooling for heat dissipation, while large-tonnage battery forklifts have large braking torque and friction plate heat. If self-cooling is used for heat dissipation, the temperature of cooling and lubricating oil will be very high, and this will be the case for a long time , will cause attenuation of braking capacity and damage to seals

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