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Select the hydraulic cylinder control valve. Why is the engineering cylinder worn

In the hydraulic cylinder, whether the selection of control valve is reasonable or not will have a great impact. When selecting control valve, it is mainly considered from two aspects: the first is the selection of proportional direction valve, and the other is the selection of inlet pressure compensator.


Usually, we can combine different valves as needed. For example, we can use the throttling control proportional directional valve of the hydraulic cylinder with the constant differential pressure reducing valve to form a differential pressure compensated proportional directional flow valve. The controlled flow of this flow valve mainly depends on the input electrical signal, It will not be affected by the change of oil supply pressure and load pressure. Generally, the differential pressure of constant differential pressure reducing valve is 1.ompa.


After the differential pressure is determined, the flow of the proportional direction valve of the hydraulic cylinder can be determined in this way: the input signal corresponding to the maximum flow actually passing through the proportional direction valve should be close to 90% of the rated input signal, and the input signal corresponding to the minimum flow actually passing through the proportional direction valve of the truck cylinder should be greater than the dead zone of the proportional direction valve, which can not only improve the resolution of the flow, It can also avoid crawling problems.


So, what should be considered when selecting the inlet pressure compensator? At present, the inlet pressure compensator of hydraulic cylinder mostly uses two-way and three-way structure, especially the two-way structure. However, it should be noted that the normal operation of this compensator requires a minimum control differential pressure, and the constant differential pressure reducing valve can play the role of constant differential pressure reduction.


If the actuator is under negative load, it will lose this effect. In order to prevent such problems, we can use the balance valve with back pressure, so as to ensure that the differential pressure at the valve port of the proportional valve does not change with the fluctuation of load.


The engineering oil cylinder is connected by high-pressure rubber hose and threaded joint, which has the advantages of fast use and overcomes the oil leakage of the joint of fast transmission hydraulic tilt oil cylinder. It is mainly used for equipment installation, jacking and disassembly in various industries such as electric power, construction, machinery manufacturing, mining, railway bridge, shipbuilding and so on.


The engineering oil cylinder is divided into double rod telescopic cylinder, high temperature cylinder, light pull rod cylinder, multi cylinder and various heavy cylinders.


1. The scars on the sliding surface of the piston are transferred. Before the installation of the piston, there are scars on the sliding surface of the piston. It is installed intact without treatment. These scars will scratch the inner surface of the cylinder wall in turn. Therefore, these scars must be fully repaired before installation.


2. The sintering phenomenon caused by excessive pressure on the sliding surface of the piston will cause the piston to tilt due to the self weight of the piston rod, or the pressure on the sliding surface of the piston will rise due to the action of transverse load, which will cause the sintering phenomenon.


In the design of hydraulic cylinder, its working conditions must be studied, and full attention must be paid to the length and clearance of piston and bushing.


The company specializes in the production of various truck accessories, mainly including cab lifting oil pump, cab lifting oil cylinder, forklift tilt oil cylinder and steering oil cylinder. At present, the company is dominated by European truck accessories, such as Vlvo Volvo truck, Benz Benz truck, Scania skenia truck, man man truck, Renault Truck, Iveco truck, DAF Duff truck, etc http://www.hualongjx.cn/ 。


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