Date of issue: 2021/4/25 2:22:44 Hits: 1163
Hydraulic system is widely used in various machines. However, if the use method and maintenance are improper, various faults may occur, which may affect production. Therefore, correct use and maintenance is an important factor to ensure that the system can extend its service life and work stably, sensitively and reliably. Now let's introduce the daily maintenance and design of the hydraulic system. Let's have a look.
Daily maintenance and design of hydraulic system
1、 Routine maintenance of hydraulic system
1. Prevention of pollution of hydraulic oil Pollution of hydraulic oil refers to mixing air, water and various solidified substances from the outside. If rusted metal powder is mixed in use, it will damage the sealing materials, coatings and other debris. The contamination of the oil will aggravate the wear between the relative moving parts in the hydraulic components, resulting in the blockage of the orifice or the jamming of the slide valve movement range, which will make the hydraulic components unable to work normally. According to statistics, more than 75% of hydraulic system failures are caused by oil pollution. Therefore, various measures must be taken to prevent or reduce oil pollution. The main methods to prevent oil pollution are:
① Before installation, the pipes and castings must be thoroughly cleaned, and the hydraulic system must be thoroughly cleaned after the final assembly;
② During the assembly of various hydraulic components, it is prohibited to wipe them with fabrics with fibers (such as cotton yarn);
③ The oil tank shall be properly sealed, and air filter shall be set at the place where the air is ventilated;
④ The seal must be reliable. It is prohibited to use oil resistant seals and rubber hoses;
⑤ The type and installation position of the filter shall be reasonably selected. The system shall be equipped with coarse and fine oil filters as required. The oil filter shall be checked frequently and replaced in time in case of damage;
⑥ Change the oil regularly, generally during the cumulative operation
The oil should be changed after more than 10000 hours. If it continues to be used, the oil will lose its lubricating performance and may become acidic, thus causing corrosion of metal parts in the hydraulic system. If it is used intermittently, the oil can be changed every half a year or once a year according to the specific situation.
2. The oil used to prevent air from entering the hydraulic system of the hydraulic system has a very low compressibility, which can be considered as incompressible in general. However, the compressibility of air is very large, about 10000 times that of oil, so even if there is a small amount of air in the system, it has a great impact. The air dissolved in the oil will escape from the oil at low pressure, producing bubbles and forming holes. In the high pressure area, under the action of the pressure oil, these bubbles will be quickly broken and rapidly compressed, making the system produce noise, At the same time, when the gas is suddenly compressed, a large amount of heat will be released, which will cause local overheating, accelerate the oil temperature rise, and damage the hydraulic components and hydraulic oil. The high compressibility of air will also lead to crawling and other failures of working organs, which will damage the stability of work and sometimes cause vibration.
Daily maintenance and design of hydraulic system
2、 Design of hydraulic system
1. Design steps The design steps of the hydraulic system do not have a strict sequence, and the steps are often interspersed with each other. Generally speaking, after the design requirements are clarified, the following steps are roughly followed.
1) Determine the form of hydraulic actuator;
2) Analyze the working conditions and determine the main parameters of the system;
3) Formulate basic scheme and hydraulic system schematic diagram;
4) Select hydraulic components;
5) Performance checking calculation of hydraulic system;
6) Draw working drawings and prepare technical documents.
2. Specify design requirements
The design requirements are the basis for each project design. Before formulating the basic scheme and further designing each part of the hydraulic system, it is necessary to understand the design requirements and other aspects related to the design content.
1) Overview of the host: purpose, performance, process flow, operating environment, general layout, etc;
2) What actions should the hydraulic system complete, the action sequence and the interlocking relationship between them;
3) The motion form and speed of the hydraulic drive mechanism;
4) Load size and nature of each action mechanism;
5) Requirements for speed regulation range, motion stability, conversion accuracy and other performance;
6) Requirements for automation program and operation control mode;
7) Requirements for dust-proof, explosion-proof, cold proof, noise, safety and reliability;
8) Requirements for efficiency, cost, etc.
Formulate basic scheme and draw hydraulic system diagram
3. Develop basic plan
(1) Formulate speed regulation scheme
After the hydraulic actuator is determined, the control of its motion direction and speed is the core problem of the hydraulic circuit.
When designing the hydraulic system, we must proceed from the actual situation and organically combine various transmission forms. To sum up, this is the daily maintenance and design introduction of the hydraulic system. I believe you have a certain understanding of this after reading it, and I hope it can help you.
