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Analysis of the Types and Characteristics of Rodless Cylinders

Author : TAIXI Date : 2019-01-04 Views : 20

The rodless cylinder has rope cylinder, steel belt cylinder, mechanical contact cylinder and magnetic coupling cylinder. They do not have rigid piston rod of common cylinder, but use piston to connect external actuator directly or indirectly, follow piston directly or indirectly to realize reciprocating linear motion. This kind of OSP Rodless Cylinder has the greatest advantages of simple structure and saving installation space, and is especially suitable for small diameter and long stroke occasions.

Mechanical contact rodless cylinder has similar advantages as rope cylinder, but mechanical contact rodless cylinder occupies less space and does not need anti-rotation mechanism. Load and piston are connected by slider moving in cylinder groove. Radial and axial loads must be paid attention to in use. In order to increase the carrying capacity, a guide mechanism must be added.

Rope cylinder and steel belt cylinder, which use rope and steel belt instead of rigid piston rod to connect piston, transfer the thrust of the piston outside the air cylinder actuator, and drive the actuator to move back and forth. This kind of cylinder is also called flexible cylinder. Its main feature is that under the same piston stroke, the installation length is half smaller than that of the ordinary air cylinder actuator. The magnetic coupling rodless cylinder is characterized by small size, lightweight, no external leakage and convenient maintenance. When the speed is high and the load is large, the inner and outer magnetic rings are easily detached, that is, the load size is affected by the speed, and it is impossible to increase the support point in the middle of the magnetic coupling rodless cylinder, and the maximum stroke is limited.

Common parts of compression leakage in OSP Rodless Cylinder:

1. Air leakage between cylinder liner and piston and piston ring.
2. Air leakage between intake and exhaust valves and valve seat.
3. Air leakage of cylinder gasket.
4. Leakage of nozzle mounting hole.
5. Because of the excessive clearance at the edge of the gas ring, the reverse of the twisted ring or conical ring, the wear of the oil ring, the excessive clearance between the cylinder liner and the piston, and the excessive amount of oil added to the oil pan, a large amount of oil enters the combustion chamber and burns, which causes the piston ring, especially the first ring, to accumulate serious carbon and cement in the annular groove, thus losing its elasticity, and greatly weakening its sealing and channeling gas to the lower part of the cylinder.
6. Because the engine works at high temperature for a long time, the elasticity of the piston ring is weakened or disappeared. Because of the incorrect installation of the piston ring or the scratch in the work, the piston ring rotates itself, resulting in the overlap of the adjacent two or more rings and the serious leakage of air to the crankcase.

The working principle of OSP Rodless Cylinder: refers to the cylinder which connects the external execution platform directly by the piston and makes it follow the piston to achieve reciprocating motion. Without the piston rod, it moves through the piston inside the cylinder while driving the external platform. The mechanical rodless cylinder is pulled by the steel belt connected with the platform.

Mechanical rodless cylinder structure: There is a slot in the axial direction of the air cylinder actuator tube, and the piston and slider move on the upper part of the slot. In order to prevent leakage and dust-proof, sealing belt and dust-proof stainless steel belt are used at the opening part to fix on the cylinder head at both ends. The piston frame passes through the groove and connects the piston with the slider. The piston is connected with the slider to drive the actuator fixed on the slider to achieve reciprocating motion.