The structure of hydraulic cylinders is diverse, and its classification methods are also diverse: according to the movement mode, it can be divided into linear reciprocating type and rotary swing type; according to the hydraulic function, it can be divided into single-acting and double-acting; according to the structure, it can be Divided into piston type, plunger type, multi-stage telescopic sleeve type, rack and pinion type, etc.
Telescopic hydraulic cylinder has two or more pistons. The extension sequence of the telescopic hydraulic cylinder piston is from large to small, and the no-load retraction sequence is generally from small to large. The telescopic cylinder has long stroke, short telescopic length and compact structure. This hydraulic cylinder is often used in construction machinery and agricultural machinery. When each piston moves continuously, the output speed and output force of the multi-motion piston are variable.
Piston hydraulic cylinders are divided into single rod type and double rod type. The fixing method is cylinder and piston rod type. According to the role of hydraulic pressure, there are single-acting and double-acting. In a single-acting hydraulic cylinder, pressure oil is only supplied to one chamber of the hydraulic cylinder. The hydraulic cylinder can move on one side, while the reverse movement is achieved by external force (such as spring force, dead weight or external load), while the piston of a double-acting hydraulic cylinder can pass through two air chambers and alternate hydraulic directions in two Ds. sports. The piston cylinder has only one piston rod on one side of the piston, so the effective areas of the two chambers are different. When the fuel supply is the same, the piston moves at different speeds in different chambers; when the load to be overcome is the same, the fuel supply pressures of different chambers are different, or after adjusting the system pressure, the two hydraulic cylinders of the garbage truck The load to be overcome is different in the direction.
Swing hydraulic cylinder is an actuator that outputs torque and realizes reciprocating motion. It has several forms such as single blade, double blade and spiral swing. Blade type: The stator base is fixed on the cylinder, and the blades are connected to the rotor. According to the oil inlet direction, the blade drives the rotor to swing back and forth. The spiral swing type is divided into a single spiral swing type and a double spiral swing type. Now the double helix is commonly used. The linear motion of the piston in the twin-screw hydraulic cylinder is converted into a compound motion of linear motion and rotary motion, so as to realize the oscillating motion.