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Anonymous users2024-02-061.The viscosity is appropriate, and the change with temperature is small: the viscosity of the working medium is too large, the pressure loss of the system is large, the efficiency is reduced, and the oil absorption condition of the pump deteriorates, which is easy to produce cavitation and cavitation, which makes the pump difficult to operate.
If the viscosity is too small, the system leaks too much, the volume loss increases, the system efficiency is low, and the rigidity of the system becomes poor. In addition, the temperature of the working medium will change when the season changes, as well as before and after the start of the machine and during the normal operation, so in order for the hydraulic system to work normally and stably, the viscosity of the working medium is required to change less with temperature.
2.Good lubrication: The working medium lubricates the moving parts in the hydraulic system to reduce friction and wear to ensure that the system can work normally for a long time.
Recently, hydraulic systems and components are developing in the direction of high performance, and many friction parts are in a state of boundary lubrication, so it is required that the hydraulic working medium has good lubricity.
3.Anti-oxidation: the working medium in contact with the air will produce oxidation deterioration, high temperature, high pressure, and some substances, such as copper, zinc, aluminum, etc., will accelerate the oxidation process, the acid value of the medium after oxidation increases, the corrosiveness is enhanced, and the viscous matter generated by oxidation will block the pores and gaps of the element, affecting the normal operation of the system, therefore, the working medium is required to have good oxidation resistance.
4.Good shear stability:
5.Rust-resistant and non-corrosive metal:
6.Compatible with sealing materials:
7.Good defoaming resistance:
8.Anti-demulsification:
9.Other:
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Anonymous users2024-02-0580% of the problems of the hydraulic system are caused by pollution, so cleanliness is the primary requirement of the hydraulic working medium, which generally reaches level 7. Secondly, the correct choice of hydraulic oil grade, such as: 32 or 46 or.
The low-pressure system can choose No. 32 high-pressure system can choose No. 46, mainly the viscosity of the oil, but also take into account the temperature of the working environment, such as in the Northeast, even the high-pressure system can also use No. 32 hydraulic oil.
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Anonymous users2024-02-04This depends on your system requirements, usually there are certain requirements for the viscosity of the hydraulic oil, the commonly used is LH46 wear-resistant hydraulic oil.
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Anonymous users2024-02-03Hydraulic transmission refers to a transmission mode that uses liquid as the working medium for energy transmission and control. In liquid transmission, according to its different forms of energy transmission, it is divided into hydraulic transmission and hydraulic transmission. Hydraulic transmission is mainly a transmission mode that uses liquid kinetic energy for energy conversion, such as hydraulic coupling and hydraulic torque converter.
Hydraulic transmission is a transmission method that uses liquid pressure energy to convert. The use of hydraulic transmission technology in machinery can simplify the structure of the machine, reduce the quality of the machine, reduce material consumption, reduce manufacturing costs, reduce labor intensity, and improve work efficiency and reliability.
The basic principle of hydraulic transmission: the hydraulic system uses the hydraulic pump to convert the mechanical energy of the prime mover into the pressure energy of the liquid, transmits the energy through the change of the liquid pressure energy, and converts the liquid pressure energy into mechanical energy with the help of hydraulic actuators (hydraulic cylinders or motors) with the help of hydraulic actuators (hydraulic cylinders or motors), so as to drive the working mechanism and realize linear reciprocating motion and rotary motion. The liquid is called the working medium, which is generally mineral oil, and its function is similar to that of transmission elements such as belts, chains and gears in mechanical transmission.
In hydraulic transmission, the hydraulic cylinder is the simplest and more complete hydraulic transmission system, and the analysis of its working process can clearly understand the basic principle of hydraulic transmission.
Hydraulic transmission has many outstanding advantages, so it is widely used, such as plastic processing machinery, pressure machinery, machine tools, etc. for general industrial use; construction machinery, construction machinery, agricultural machinery, automobiles, etc. in mobile machinery; metallurgical machinery, lifting devices, roll adjustment devices for the iron and steel industry, etc.; Flood control gates and embankment devices, riverbed lifting devices, bridge control mechanisms for civil engineering and water conservancy projects, etc.; power plants, turbines, speed control devices, nuclear power plants, etc.; Deck hoisting machinery (winch), bow door, bulkhead valve, stern thruster, etc.
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Anonymous users2024-02-02The commonly used working media of hydraulic systems are mainly divided into the following types:
Mineral hydraulic oil, commonly used is also this type of hydraulic oil, such as HL, HM hydraulic oil anti-flame fluid, used in the need for flame retardant fluid, various emulsions, water-glycol hydraulic fluid synthesis, phosphate ester hydraulic fluid, halide hydraulic fluid, etc.
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Anonymous users2024-02-01Hydraulic oil is used as an intermediate medium in the transmission system, playing the role of transmitting and converting energy, and also plays the role of lubrication, anti-corrosion, cooling and flushing of various parts in the hydraulic system.
If the hydraulic oil is polluted or improperly selected, it will affect the operation reliability of the entire hydraulic system, reduce the service life of the hydraulic components, and even affect the operation safety of the whole set of equipment, causing accidents.
All it is necessary to choose a high-quality liquid.
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Anonymous users2024-01-31In the hydraulic system, the working medium usually refers to hydraulic oil or hydraulic fluid, which is an important part necessary for the normal operation of the hydraulic system. The main functions of the working medium in the hydraulic system are as follows:
1.Energy transfer: Under the action of the hydraulic pump, the working medium is transported to each hydraulic actuator through the pipeline, and the mechanical energy is converted into hydraulic energy, so as to realize the energy transfer of the hydraulic system.
2.Transmission of power: The working medium in the hydraulic system can transmit power and drive the hydraulic actuator to complete various actions, such as pushing the brakes of the car, lifting the robotic arm, etc.
3.Transmission signal: The working medium in the hydraulic system can also transmit signals to realize the control of the hydraulic actuator by controlling the opening and closing and adjustment of the hydraulic valve.
4.Cooling and lubrication: The working medium in the hydraulic system can also play a role in cooling and lubrication, effectively controlling the temperature of the hydraulic system and reducing friction loss, thereby prolonging the service life of the hydraulic system.
To sum up, the working medium plays a vital role in the hydraulic system and is the basis for the hydraulic system to work normally.
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Anonymous users2024-01-30In the hydraulic system, why should the working medium be included as part of the system?
Hello dear, this question is answered by me in a simple argument: in the hydraulic system, why should the working medium be included in the system, the working medium is an indispensable part of the hydraulic system, mainly because it can complete the energy conversion and transfer, in addition, there is also heat dissipation, prevent rust and corrosion, reduce wear and friction, precipitation and separation of insoluble dirt slip and other functions. <>
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Anonymous users2024-01-29Hydraulic transmission uses fluid as the working medium. （）
a.Shake your hands correctly.
b.Error Liang Xi.
The correct oak hole is the answer: a
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Anonymous users2024-01-28Hydraulic transmission is a transmission method that uses fluid to transmit power and uses liquid as the working medium.
It drives mechanical transmissions such as hydraulic motors or cylinders by utilizing the pressure and flow of liquid media in pipes and valves to achieve the transmission of force and motion. Hydraulic transmission has the advantages of fast response, high precision and large bearing capacity, and is widely used in industry, agriculture, machinery, construction, mining, shipbuilding, aviation, transportation, military and other fields.
The hydraulic transmission system is composed of four parts: liquid power source, liquid transmission system, actuator and control system. The commonly used liquid medium is hydraulic oil or water, which has the characteristics of low compressibility, high viscosity and stable density. The hydraulic drive system realizes force, motion and pressure control through the liquid drive mechanism, which makes the mechanical equipment have high efficiency and reliability.
The hydraulic transmission system has several advantages:
1. Large transmission power: Compared with mechanical transmission, hydraulic transmission can transmit greater power and torque.
2. High precision: hydraulic transmission can achieve more accurate position control and speed adjustment, so it is widely used in equipment and systems with high requirements for control accuracy.
3. Good self-locking performance: the hydraulic system has strong self-locking performance, which can ensure that the hydraulic cylinder maintains its position when stopping, thereby improving the safety and reliability of the equipment.
4. Flexible and convenient operation: the layout of the hydraulic pipeline is relatively simple, and the operation, adjustment and maintenance are relatively convenient.
Disadvantages of hydraulic transmission
There are also some disadvantages of hydraulic transmission, which include: affected by temperature changes, leakage problems, high operating noise, difficult maintenance, complex control, etc. As a power transmission mode widely used in industry, agriculture, aviation, aerospace, military and other fields, hydraulic transmission has a wide range of application prospects and importance, but there are also many shortcomings and limitations in the process of use, which need to be solved and improved in a targeted manner.
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Anonymous users2024-01-27Dear users, the traditional medium of the hydraulic system is hydraulic oil, which is a special liquid with high viscosity and compressibility, which can transmit force and energy under high pressure. The main component of hydraulic oil is mineral oil, which has good lubricity and stability, and can ensure the normal operation of the hydraulic system. In addition to mineral oil, there are also different types of hydraulic oil, such as synthetic hydraulic oil and biohydraulic oil, which can be selected and used according to different needs.
The role of hydraulic oil, the traditional medium of hydraulic system, in the hydraulic system is to transmit energy and force, which increases the hydraulic oil pressure through the empty seepage of the hydraulic pump and sends it into the hydraulic or hydraulic motor, so as to achieve mechanical movement. Hydraulic oil also has the functions of cooling, sealing, shock absorption, etc., to ensure the normal operation of the hydraulic system.
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