Custom hydraulic system principle selection taboo

Custom hydraulic system principle selection taboo

Custom hydraulic systems are a new technology for mechanical transmission. China's hydraulic industry began in the 1950s, and its products were first applied to machine tools and forging equipment, and then applied to tractors and construction machinery. Since the introduction of some hydraulic components production technology from abroad in 1964, while designing hydraulic products on their own, China's hydraulic components have formed a system from low pressure to high pressure, widely used in a variety of mechanical equipment, then, let's understand the principle of custom hydraulic system selection taboo!

1. Safety design of customized hydraulic system

Hydraulic systems and equipment must be limited (specified) maximum pressure, that is, rated pressure 1 or maximum working pressure, nominal pressure, and the use of the following conditions. In addition to the hydraulic power source using the pressure compensated variable pump, the general system must be equipped with one or more relief valves to limit the pressure of all parts of the hydraulic system. In particular, consider setting the relief valve in the piston rod chamber of the cylinder to ensure that the pressurization caused by the difference in piston area does not exceed the rated pressure limit of the cylinder.

The relief valve is used to control the pressure value in the chamber. When the pressure exceeds the set pressure, the pressure is usually reduced through the relief valve, and the overflow hydraulic oil is directly returned to the tank.

The hydraulic system has no pressure limiting device and pressure indicating (indicating) device.

2. Custom hydraulic system practical design taboo

The hydraulic system should not have redundant circuits. The control function of the hydraulic system, including the control accuracy, can only be selected and designed within the range that the existing parts can achieve, and excessive control design may exist "redundancy".

Taking throttle circuit as an example, the general inlet throttling (inlet throttling), reflux speed regulation, and by-pass speed regulation must not appear in a hydraulic system at the same time, and two identical throttle valves can not be set and installed in a pipeline.

The design of hydraulic systems with "redundancy" is prohibited, except for those designed to improve the safety of hydraulic systems.

The applicability of the hydraulic system must be checked and maintainable, and the necessary pressure, flow, temperature and other instruments must be installed; Necessary inspection and inspection ports must be ensured; The necessary disassembly space shall be sufficient.

Taboo Hydraulic system can not be checked, can not be maintained.

The hydraulic transmission device and control itself also has many shortcomings such as speed range, response time (speed) control accuracy, hydraulic shock, ambient temperature, noise and vibration, so it should be combined with other transmission devices and control forms as needed to optimize and improve the practical performance of the whole machine

It is forbidden to design hydraulic systems and circuits that are unstable (operating conditions and conditions).

3. Economy and design taboo of customized hydraulic system

In addition to the simple and practical design of the hydraulic system and circuit, the selection of hydraulic components must also meet the premise of function, the selection of low-cost components. For example, the hydraulic pump should give priority to the gear pump, throttle speed regulation should give priority to the throttle valve, and the back pressure circuit should give priority to the check valve.

The form of connection between hydraulic components is very important, high pressure, large flow hydraulic system in addition to the priority to use 2-port plug-in hydraulic valves, there are plate valves, tubular valves, insert valves, threaded insert valves, etc., the number of pipelines is small, less bending hydraulic equipment brand is also very important, generally in the contract between the supply and demand parties clearly defined. In addition, in order to support the development and progress of national industry, the use of domestic independent brands of hydraulic products. By choosing simple connection form and convenient purchase of hydraulic components, the manufacturing period of the hydraulic system can be shortened, which helps to reduce costs and improve economic benefits.

The above is the principle of custom hydraulic system selection taboo, if you need to know more, you can feel free to contact us!