The design criteria of green and environment-friendly hydraulic system are classified into natural environment criteria on the basis of the technical criteria, old principles and ergonomics criteria that are usually used in the design of traditional hydraulic system, and the natural environment criteria are given high priority. The design criteria of environment-friendly hydraulic system can be summarized as follows:
(1) Resource utilization rate criteria
Rarely used or scarce raw materials, although looking for alternative materials, more waste materials, surplus materials or purchased materials as raw materials; Improve the reliability and service life of products; Although the variety of materials in the product is reduced to facilitate the useful purchase after the product is burned.
(2) Zero pollution criterion
Although toxic and harmful raw materials are rarely used or not used.
(3) Very little energy consumption criterion
Although materials with good compatibility are accepted, materials that are difficult to acquire or cannot be acquired are not accepted; On the basis of ensuring the durability of the product, pay for the reasonable service life of the product, and strive to reduce the energy consumption in the application process of the product.
(4) Technical advancement criteria
Optimize the product performance, establish a "small and refined" design mind in the layout design, and reduce the product weight through the miniaturization of the product despite the application of thrifty resources, such as accepting light materials, removing redundant effects, avoiding excessive packaging, etc., under the condition of uniform performance.
Simplify the product layout and advocate the design principle of "simplicity and beauty", such as reducing the number of parts, which is convenient for installation, destruction and classification after burning; The modular design is accepted. At this time, the product is composed of various functional modules, which is not only beneficial to the installation and destruction of the product, but also convenient for the purchase and disposal after burning.
Pay attention to the variety and serialization of products in the process of hydraulic system design; Adopt reasonable process, simplify product processing flow, cut processing procedures, and simplify destruction process, such as adopting connection methods that are easy to be destroyed, reducing fastener consumption, and avoiding destructive destruction methods in layout design; Simplify product packaging as much as possible and avoid secondary pollution.
The hydraulic system is composed of two parts: light signal control and hydraulic power. The light signal control part is used to drive the control valve action in the hydraulic power part.
The hydraulic power is represented by the circuit diagram to show the relationship between different functional components. The hydraulic source comprises a hydraulic pump, a motor and hydraulic auxiliary components; Hydraulic control unilaterally contains various control valves, which are used to control the flow, pressure and deviation of working oil; The execution side contains hydraulic cylinder or hydraulic motor, which can be selected according to the actual requirements.
When analyzing and designing a realistic mission, the general acceptance block diagram shows the actual operation status of the equipment. The empty arrow represents the light signal flow, while the solid arrow represents the energy flow. The sequence of actions in the basic hydraulic circuit - master the reversing and spring return of the element (two position four-way reversing valve), the extension and retraction of the actuating element (double benefit hydraulic cylinder), and the opening and closing of the overflow valve. For the executive component and master component, the presentation is based on the symbols of the response circuit diagram, which also makes preparations for explaining the symbols of the circuit diagram.
According to the working principle of the hydraulic system, you can number all circuits sequentially. If an actuator number is 0, its associated master element identifier is 1. If the element identifier corresponding to the extension of the actuator is even, the element identifier corresponding to the retraction of the actuator is odd. Not only the hydraulic circuit but also the actual equipment should be numbered in order to find system faults.
DIN ISO1219-2 defines the numbering composition of components, which includes the following four aspects: equipment number, circuit number, component identifier and component number. If there is only one kind of equipment in all systems, the equipment number may be unknown.
In reality, another numbering method is to serial number all components in the hydraulic system. At this time, the component number should be consistent with the number in the component list. This technique is particularly suitable for complex hydraulic control systems, and each control circuit is compared with its system number.
