The principle of hydraulics?

Features and basic principles of hydraulic transmission 1. Introduction to hydraulic transmission Hydraulic transmission is a method of transmitting energy and enabling control by using a fluid as the working medium. Hydraulic transmission and pneumatic transmission, collectively known as fluid power transmission, are emerging technologies that have developed based on the principle of hydrostatic pressure transmission proposed by Pascal in the 17th century; they are widely used in industrial and agricultural production. In 1795, Joseph Braman in Britain applied it to industry in the form of a hydraulic press, giving birth to the world’s first hydraulic press. In 1905, changing the working medium from water to oil led to further improvements. After World War I, hydraulic transmission was widely used, and its development accelerated even more after 1920. Hydraulic components only began to enter the stage of regular industrial production during the 20 years from the end of the 19th century to the beginning of the 20th century. In 1925, F. Vikers invented the pressure-balanced vane pump, which laid the foundation for the gradual development of the modern hydraulic components industry and hydraulic transmission. In the early 20th century, G. Constantimsco’s theoretical and practical research on the transmission of energy fluctuations, along with his contributions in 1910 to hydraulic transmission (such as hydraulic couplings and torque converters), contributed to the development of these two fields. During World War II, 30% of American machine tools used hydraulic drive. Around 1955, Japan saw rapid development in hydraulic transmission, and the \"Hydraulic Industry Association\" was established in 1956. 2. Characteristics of hydraulic transmission Advantages of hydraulic transmission: (1) It has a small size and light weight, resulting in low inertial force; therefore, no significant shock occurs when there is a sudden overload or stoppage ； (2) It can smoothly adjust the traction speed automatically within a given range, and enables stepless speed control ； (3) Easy reversal: it is possible to conveniently switch between the rotation of the working mechanism and its linear reciprocating motion without changing the direction of motor rotation ； (4) The hydraulic pump and the hydraulic motor are connected by oil pipes, and there are no strict restrictions on their spatial arrangement relative to each other ； (5) Since oil is used as the working medium, self-lubrication occurs between the relatively moving surfaces of the components, resulting in low wear and a long service life ； (6) Simple operation and control, with a high degree of automation ； (7) Overload protection is easy to implement. Hydraulic transmission has many outstanding advantages, which is why it is widely used in various applications such as plastic processing machinery, pressure machinery, and machine tools in general industry ； Construction machinery, building machinery, agricultural machinery, automobiles, etc., among mobile machinery ； Metallurgical machinery, lifting devices, roll adjustment devices, etc. for the steel industry ； Flood control gates and dam devices for civil and hydraulic engineering, riverbed elevation devices, bridge control mechanisms, etc ； Power plant turbine speed control devices, etc ； Deck lifting machinery for ships, bow doors, bulkhead valves, stern propellers, etc ； Control devices for special technologies, measuring buoys, elevating and rotating stages, etc ； **Industrial artillery control systems, ship stabilizers, aircraft simulation, aircraft landing gear retraction systems, and rudder control systems, etc. Disadvantages of hydraulic transmission: (1) Using hydraulic transmission requires high maintenance standards, as the working fluid must always remain clean ； (2) High requirements are placed on the manufacturing precision of hydraulic components; the manufacturing process is complex, and the costs are high ； (3) The repair of hydraulic components is complex and requires a high level of technical expertise ； (4) Oil is used as the working medium, posing a fire hazard at the working site ； (5) Low transmission efficiency. 3. Basic principles of hydraulic transmission The basic principle of hydraulic transmission is to use pressurized oil as a working medium within a sealed container to achieve energy conversion and power transmission. The liquid in it is called the working medium, usually mineral oil; its function is similar to that of transmission elements such as belts, chains, and gears in mechanical transmissions. Hydraulic transmission makes use of Pascal’s principle! Pascal’s principle essentially states that in a closed system, when a force is applied to a liquid, this liquid transmits that force in all directions! The magnitude of the force remains unchanged! Hydraulic transmission makes use of this physical property to apply a force to an object, and the Pascal principle is used to amplify this force! Thus achieving the effect of lifting heavy objects! Hydraulic transmission is also widely used in the valve industry, such as machine tools for manufacturing and processing valves, hydraulic testing equipment for valves, and hydraulic drive systems for valves.

Hydraulic transmission makes use of this physical property to apply force to an object; according to Pascal’s principle, applying a certain pressure on a piston in a hydraulic system will result in an identical increase in pressure on another piston. If the area of the second piston is 10 times that of the first piston, then the force acting on the second piston will increase to 10 times that acting on the first piston, while the pressure on both pistons remains equal. The individual’s strength increases. So how do hydraulic shears work? How can reducing the area increase the force? Because of the 5.12 earthquake, I was in Chengdu; it was the hydraulic cutters that saved many people in Beichuan, so I really want to learn more about them.