Explain the low speed high torque hydraulic motor "crawling" state

1, the status of

When the service platform rotates, it stops and moves suddenly, that is, the rotation does not last. Slow speed, low energy, etc.

2. Root cause

Low speed and high torque hydraulic motor is a heat transfer equipment, that is, input liquid pressure can transform mechanical kinetic energy export, if not considering the A2FE series hydraulic motor's own high efficiency, should be the kinetic energy input equivalent to export. Because of this, the lack of rotation of the hydraulic motor is definitely the reduction of the heat input of the hydraulic motor. When the kinetic energy is difficult to overcome the rotation resistance of the service platform, it produces a stop.

According to the basic principle of the hydraulic transmission system, the hydraulic motor is also operated by liquid pressure. When the control valve is connected to the working pressure oil channel, the hydraulic motor of the hydraulic press must stop because the oil pressure of the hydraulic cylinder of the piston pump of the hydraulic motor of the hydraulic press cannot get rid of the operating resistance of the service platform. When the kinetic energy of the deposit is enough to get rid of resistance, the hydraulic motor gets rid of resistance and jump rotation, the oil working pressure in the system software is steep, the motor is interrupted, so that the service platform "crawling" constantly comes down, or the resistance to block the rotation of the hydraulic motor is too large to cause "crawling". Refer to root cause and diagnosis of slow lift of arm hydraulic cylinder for total flow and pressure reduction that can be caused by typing hydraulic fluid.

In a word, the hydraulic press motor "crawling" so that the oil working pressure in the system software is not stable, the oil pressure is not stable mostly because of the gas in the system software, the system software into the gas reason and the first part of the same.

The mechanical energy of hydraulic motor is low because of the excessive rotary resistance of hydraulic motor. Such as CA70 series hydraulic motor piston pump and mutual friction pair resistance is too large, swash plate and piston pump friction resistance is too large, rolling bearings are not good enough to cause friction resistance is too large, or gear box gear transmission efficiency is low. Or is the network platform wheel mechanical equipment friction is too large.