How Vehicle Electric Telescopic Mast Works
June 17,2022
Vehicle electric telescopic mast
1. The efficiency of the pump is low.
The total efficiency of the pump refers to the part of the input power that is delivered to the system. The difference between 100% and total efficiency refers to mechanical losses such as friction and air resistance, and hydraulic losses due to eddy currents and leakage.
2. The compressibility of the oil.
All hydraulic fluids are compressible to some extent. Just as gases, such as air, tend to rise in temperature when they are pressurized (this is where diesel ignition comes from), the temperature of the hydraulic oil will rise as the system pressure of the pump increases. It may be argued that this temperature rise can be compensated for by the expansion of the hydraulic oil after it leaves the valve and actuator. However, this compressive effect must be taken into account in the calculation of the temperature rise, since the diffusion of heat is affected by the total temperature difference.
3. Loss of motor and cylinder.
A motor works similarly to a pump, with the same inefficiencies. Most of the cylinders have some internal and external leakage, and if the design is correct, the frictional resistance will not be very large. However, some cylinders used in servo control systems need to be specially designed to have very low friction losses. Such cylinders can have considerable internal leakage.
4. Valve leakage Internal leakage of the valve.
For example, when the valve is in the neutral or closed position, leakage from the pressure side to the tank port can generate heat. Flow with valve fully open center position For fully open center or "overloaded" valves, when the valve is in the neutral or closed position, system flow is lost due to pressure drop across the line and valve. To avoid excessive heat generation, a maximum of three such valves are typically used in such systems.
The flow rate of the servo valve in the middle position is fully open. Most of the two-stage servo valves, especially the electro-hydraulic valve, the first stage is fully open in the middle position. All flow through this stage that is not used to drive the second stage is a power loss that becomes heat. In some systems, such as flight control systems on large aircraft, this power loss can be substantial.
5. Throttle of the valve.
The price the system designer pays for maintaining precise control of the valve is the throttling loss through the valve's throttling shoulder.
This is especially true for proportional or servo valves. These losses account for a large percentage of the available input pressure because of the essential characteristics of the control valve to regulate flow.
6. Losses in the pipeline.
It is well known that there is a pressure drop in the supply and return lines. But designers are rarely aware that these pressure drops can cause the system to heat up.
For military vehicles and aircraft, where space and weight are often at a premium, piping dimensions are kept to a minimum, and a comprehensive balance between these factors and piping pressure drop is necessary.
Check whether the power supply of the control system is connected. If the power supply is correctly selected according to the regulations, press the power switch "ON" to proceed to the next step.
Check whether the pressure gauge indicates normal or not. If the pressure gauge is completely normal, proceed to the next inspection.
Check whether the intake pipe of the Vehicle electric telescopic mast is unobstructed, and must not be stuck or folded, and whether there is air leakage in the trachea. If there is air leakage, replace the trachea. If there is no problem with the trachea, go to the next step.
Remove the air pump, turn on the power supply of the air pump, no compressed gas is produced at the air pump outlet, and the air pump is damaged, replace the air pump, otherwise go to the next step.
Remove the mast air intake pipe and turn on the air pump. If there is compressed gas spouting out and the mast is damaged, please contact us immediately. If no compressed gas is ejected, the control board is damaged and needs to be replaced.
During operation, if there is any abnormal situation, you can check and deal with the following phenomena before contacting our company.
Check whether there is gas discharged from the air outlet, whether the exhaust pipe is unblocked, and there must be no jamming, folding, pressing, etc. If the gas path is normal, proceed to the next step.
There may be debris on the section sleeve, use a brush to clean the debris on the section sleeve, and tap the part of the mast that cannot be lowered with the palm of your hand, the mast can be lowered.
If the Vehicle electric telescopic mast cannot be lowered after the above treatment, it means the mast is damaged, please contact us immediately.
Vehicle electric telescopic mast equipment maintenance refers to the technical activities carried out to restore its functions after the technical state of the equipment deteriorates or fails, including various planned repairs and unplanned failure repairs and accident repairs. Also known as equipment repair. The basic contents of equipment maintenance include: equipment maintenance, equipment inspection and equipment repair.