Atos isolator servo actuator

Atos servo actuator；

ATOS piston hydraulic cylinderIt can be divided into two types of structures: single rod and double rod, which are fixed by the cylinder body and piston rod. Depending on the hydraulic pressure, there are single acting and double acting structures. In a single acting hydraulic cylinder, pressure oil is only supplied to one chamber of the cylinder, and hydraulic pressure is used to achieve unidirectional movement of the cylinder. Reverse movement is achieved by external forces such as spring force, self weight, or external loads; The movement of the piston in both directions of the double acting hydraulic cylinder is achieved through alternating oil injection into two chambers, relying on the action of hydraulic pressure.
The schematic diagram of a single rod double acting piston hydraulic cylinder is shown in the figure. It only has a piston rod on one side of the piston, so the effective working area of the two chambers is different. When the oil supply is the same, the piston's movement speed varies depending on the chamber being filled with oil; When the load force to be overcome is the same, different chambers require different oil supply pressures, or in other words, after the system pressure is set, the hydraulic cylinder of the environmental sanitation garbage truck can overcome different load forces in both directions.
ATOS hydraulic cylinder plunger type
(1) A plunger hydraulic cylinder is a single acting hydraulic cylinder that can only move in one direction by hydraulic pressure, and the return of the plunger depends on other external forces or the weight of the plunger;
(2) The plunger is only supported by the cylinder liner and does not come into contact with it, making the cylinder liner easy to machine and suitable for making long stroke hydraulic cylinders;
(3) The plunger is always under pressure during operation, so it must have sufficient stiffness;
(4) The weight of the plunger is often large, and when placed horizontally, it is prone to sagging due to its own weight, causing wear on the seals and guide on one side. Therefore, its vertical use is more advantageous.
ATOS hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy in a hydraulic system. Its faults can be basically summarized as hydraulic cylinder misoperation, inability to push the load, and piston slip or crawling. The phenomenon of equipment shutdown caused by hydraulic cylinder failure is not uncommon, therefore, the fault diagnosis and maintenance of hydraulic cylinders should be taken seriously.
1ATOShydraulic cylinderFault diagnosis and handling
1. Mistake or malfunction of action
There are several reasons and solutions as follows:
(1) The valve core is stuck or the valve hole is blocked. When the flow valve or directional valve core is stuck or the valve hole is blocked, the hydraulic cylinder is prone to misoperation or malfunction. At this time, the contamination of the oil should be checked; Check if dirt or gum deposits are stuck in the valve core or blocking the valve hole; Check the wear of the valve body, clean and replace the system filter, clean the oil tank, and replace the hydraulic medium.
(2) The piston rod is stuck with the cylinder or the hydraulic cylinder is blocked. At this point, no matter how you manipulate it, the hydraulic cylinder will not move or move very little. At this point, it is necessary to check whether the piston and piston rod seals are too tight, whether dirt and gum deposits have entered, whether the axis of the piston rod and cylinder is aligned, whether vulnerable parts and seals have failed, and whether the load carried is too high.
(3) The hydraulic system control pressure is too low. The throttling resistance in the control pipeline may be too high, the flow valve may be improperly adjusted, the control pressure may be inappropriate, and the pressure source may be disturbed. At this point, the control pressure source should be checked to ensure that the pressure is adjusted to the specified value of the system.
(4) Air enters the hydraulic system. Mainly due to leaks occurring in the system. At this time, it is necessary to check the liquid level of the hydraulic oil tank, the sealing components and pipe joints on the suction side of the hydraulic pump, and whether the suction coarse filter is too dirty. If so, hydraulic oil should be replenished, seals and pipe joints should be treated, and the coarse filter element should be cleaned or replaced.
(5) The initial movement of the hydraulic cylinder is slow. At low temperatures, hydraulic oil has high viscosity and poor fluidity, resulting in slow hydraulic cylinder movement. The improvement method is to replace the hydraulic oil with better viscosity and temperature performance. At low temperatures, a heater or the machine itself can be used to heat up the oil temperature during startup. The normal operating oil temperature of the system should be maintained at around 40 ℃.
2. Cannot drive load during operation
mainly manifested asATOS pistonThe reasons for inaccurate pole positioning, insufficient thrust, decreased speed, unstable operation, etc. are:
(1) Internal leakage of hydraulic cylinder. Internal leakage of hydraulic cylinders includes leakage caused by excessive wear of the hydraulic cylinder body seal, piston rod and seal cover seal, and piston seal.
The reason for the leakage of the piston rod and sealing cover seal is due to the wrinkling, squeezing, tearing, wear, aging, deterioration, deformation, etc. of the seal. At this time, a new seal should be replaced.
The main reasons for excessive wear of piston seals are improper adjustment of the speed control valve, resulting in excessive back pressure and improper installation of seals or hydraulic oil contamination. Secondly, there are foreign objects entering during assembly and poor quality of sealing materials. The consequence is slow and powerless movement, and in severe cases, it can also cause damage to the piston and cylinder, resulting in the phenomenon of "pulling the cylinder". The solution is to adjust the speed control valve and make necessary operations and improvements according to the installation instructions.
(2) Hydraulic circuit leakage. Including leaks in valves and hydraulic pipelines. The maintenance method is to operate the directional valve to check and eliminate leaks in the hydraulic connection pipeline.
(3) The hydraulic oil is bypassed back to the oil tank through the overflow valve. If the overflow valve gets stuck in the valve core due to dirt, causing the overflow valve to remain open, hydraulic oil will bypass the overflow valve and flow directly back to the oil tank, resulting in no oil entering the hydraulic cylinder. If the load is too large, although the regulating pressure of the relief valve has reached a large fixed value, the hydraulic cylinder still cannot obtain the thrust required for continuous operation and does not move. If the adjustment pressure is low, it will not reach the required vertebral force due to insufficient pressure, resulting in insufficient thrust. At this time, the overflow valve should be checked and adjusted.