The thermal decay of a vehicle braking system such as a suction truck is also referred to as braking constancy. It refers to the extent to which the braking effect can be maintained when the brake temperature rises significantly during a sudden braking or continuous braking. Brake consistency also includes the degree of retention of braking performance after the brake system is flooded, ie, resistance to water decay.
In fact, the braking process is a process that transforms kinetic energy into heat energy. If the heat is slow, it will affect the performance of the braking system. However, since the thermal energy in braking cannot be dissipated immediately, any braking system will always have a thermal decay phenomenon. Any advanced braking system cannot avoid the phenomenon of thermal decay, but only to a different degree. The braking system with better performance is only a small phenomenon of thermal decay, and thermal decay is one of the most important indicators to measure braking performance.
According to international standards, it is recommended to brake 15 times continuously at a certain vehicle speed. The final braking performance should be no less than 60% of the cold brake performance, which is normal (under the condition that the brake pedal has the same force).
After foreign laws and regulations require the brake system to be flooded, it only takes 5-15 times to return to the original braking performance, which is normal. Nowadays some of the more advanced models have been equipped with a "braking self-drying system" that can automatically clear the flooding in the braking system.
Daily maintenance of excavator hydraulic cylinders
The hydraulic cylinder of an excavator is one of the important hydraulic components responsible for driving and controlling mechanical movements. In order to ensure the normal use of hydraulic cylinders and extend their service life, daily maintenance is necessary.
1. Regularly clean the hydraulic cylinder: During use, the hydraulic cylinder will be attacked by various pollutants, such as dust, sediment, oil stains, etc. These pollutants can affect the working efficiency and lifespan of the hydraulic cylinder. Therefore, it is necessary to regularly clean the hydraulic cylinder.
2. Regular inspection of seals: The seals of hydraulic cylinders are key components to ensure their normal operation. If the seals are damaged or worn, it can lead to oil leakage or unstable operation of the hydraulic cylinder. Therefore, it is necessary to regularly inspect the sealing components of the hydraulic cylinder and replace them in a timely manner if there is any damage or wear.
3. Regular inspection of hydraulic oil: The operation of hydraulic cylinders requires the support of hydraulic oil, so the quality of hydraulic oil has an important impact on the working effect of hydraulic cylinders. Regularly check the quality of hydraulic oil, and replace it promptly if there is contamination or deterioration.
4. Regularly check the hydraulic pipeline: The hydraulic pipeline is the blood vessel of the hydraulic cylinder. If there is oil leakage or damage to the pipeline, it can cause the hydraulic cylinder to not work properly. Therefore, it is necessary to regularly inspect the hydraulic pipelines and promptly repair or replace them if there is any oil leakage or damage.
5. Regularly lubricate the hydraulic cylinder: The piston rod and piston ring of the hydraulic cylinder need to be lubricated to reduce wear and friction. Therefore, it is necessary to regularly apply lubricating oil to ensure the normal operation of the hydraulic cylinder.
In short, the daily maintenance of excavator hydraulic cylinders is very important, which can extend their service life and improve work efficiency. Regular cleaning of hydraulic cylinders, inspection of seals, hydraulic oil, hydraulic pipelines, and lubrication of hydraulic cylinders are required.
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