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Double-acting hydraulic cylinder: The hydraulic cylinder is an executive element in the hydraulic system, and its function is to convert hydraulic energy into mechanical energy. The input of the hydraulic cylinder is the flow and pressure of the liquid body, and the output is the linear velocity and force. The piston of the hydraulic cylinder can complete the reciprocating linear motion and output a limited linear displacement. Double-acting hydraulic cylinder refers to a hydraulic cylinder that can input pressure oil from both sides of the piston. It is often used as the driving component of the jack. The actuator of the double-acting hydraulic cylinder is the main output device of the hydraulic system. Although there are differences in size, type and design structure, this part is usually the most observable part. These actuators convert the fluid pressure into a fast, controllable linear motion or force to drive the load. Typical actuators include hydraulic cylinder blocks, throttle valve covers, pistons, piston rods, seals, and the bearing surfaces of the pistons and piston rods. Generally, it can withstand pressures within 20,000 kPa (continuous pressure) for all aspects of the industry; for stirring and pressure applications, it can reach 55,000 kPa. The stroke length can reach 3 meters, the diameter of the hydraulic cylinder can reach 20cm, and there are larger sizes that can be used for other special applications. According to the basic hydraulic relationship (Pascal's law), the linear pressure generated by the cylinder is the product of the system fluid pressure P and the effective area A of the piston, that is, F=PA. Of course, friction and other actual losses will reduce the effect of force. The simplest structure of the actuator is a simple-acting hydraulic cylinder, the hydraulic body is on one side of the piston, and the output force and movement are generated in only one direction. Gravity or an external spring can make the piston return to the starting position, and the liquid body returns to the cylinder. When the piston rod is bent and extended, a double-acting cylinder will generate force or movement from either end of the piston. The seal between the outer diameter of the piston and the special inner diameter of the cylinder must be able to deal with the problems of direction and movement at the same time. In addition, here can also be a double-ended rod cylinder, which adds a special plug rod to extend and move through the rear cover of the cylinder. In a typical double-acting hydraulic cylinder, the force generated when the piston is extended will be slightly greater than the force of contraction. Although the pressure received on each piston is the same, because the effective area exposed to the hydraulic fluid is different , So the force is also different.
Another alternative type of actuator is a piston type cylinder. The diameter of the piston rod can be adapted to various environments. The diameter of the full piston is designed for long strokes under pressure or impact. When the horizontal element or the vertical direction is loaded, it avoids the bending of the special plug rod. The piston is connected to a high-strength steel piston rod, and the other end of the piston rod is connected to the end of the piston. The surface hardening or chrome-plated rod method is usually used to make the surface treatment very delicate and ensure the long-term use of the sealing effect. The piston must be accurately fitted to the cylinder body. Each part is a strict cylinder and has been precisely processed to produce a smooth and smooth output motion. Double-acting cylinders are the most commonly used type of hydraulic cylinders, which provide special strokes for output in two directions. The industrial cylinder block also supports steering tie rods to fix the cylinder block, cylinder head and end cover. The latest industrial double-acting hydraulic cylinder also adds sensor feedback and an electronic hydraulic servo valve, which can complete complex high-speed and displacement control dictatorships. The scope of application not only includes the production of machine tools and metal processing equipment, but also can be widely used in steel actuators, nuclear power plants, passenger elevators, etc.