Classification Of Rodless Cylinders
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Rodless Cylinder refers to a cylinder that uses a piston to directly or indirectly connect to an external execution platform and make it follow the piston to achieve reciprocating motion. The characteristic of this type of cylinder is that it does not have a piston rod. The piston inside the cylinder is ventilated and moves while driving the external platform, thereby saving installation space. If the installation space of a rod cylinder is about 2.2 times the stroke, the rodless cylinder can be reduced to about 1.2 times the stroke, and the positioning accuracy is also relatively high. It is generally required to be matched with a guide mechanism. According to the working principle, rodless cylinders are divided into magnetic coupling rodless cylinders (magnetic cylinders) and mechanical contact rodless cylinders.
(1) Magnetic coupling rodless cylinder: A set of high-strength permanent magnetic rings are installed on the piston of the magnetic coupling rodless cylinder, so that the magnetic lines of force pass through the thin-walled cylinder and act on another set of magnetic rings on the outside. Since the two sets of magnetic rings have opposite magnetic properties, they have strong suction. When the piston is pushed by air pressure in the cylinder, the magnetic ring in the external slider is affected by the magnetic force lines of the magnetic ring on the piston and moves synchronously. The thrust of the cylinder piston must be adapted to the suction force of the inner and outer magnetic rings. Otherwise, when the air pressure is too high or the load is too heavy, the piston thrust will be too large. When the attraction between the magnetic rings cannot be maintained, the inner and outer magnetic rings will be detached, and the cylinder will not work properly. This is called off-target in professional terms.
(2) Mechanical contact rodless cylinder: A mechanical contact rodless cylinder refers to a cylinder that uses a piston to directly connect to an external execution platform and make it follow the piston to achieve reciprocating motion. There is no piston rod. The piston inside the cylinder moves while driving the external platform. The mechanical rodless cylinder is pulled by a steel belt connected to the platform. A groove is opened in the axial direction of the cylinder tube, and the piston and slider move in the upper part of the groove. In order to prevent leakage and dust, a sealing belt and a dustproof stainless steel belt are used to fix the opening to the cylinder covers at both ends. The piston rack passes through the groove to connect the piston and the slider as one. The piston is connected to the slider, driving the actuator fixed on the slider to achieve reciprocating motion.
