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The working principle of the rodless cylinder and the difference with the rod cylinder

Update:25 Sep 2020
Summary:

Working principle of rodless cylinder The working princ […]

Working principle of rodless cylinder

The working principle of the rodless cylinder is the same as the ordinary cylinder, except that the external connecting seal is different. Both sides of the cylinder are hollow. The permanent magnet in the piston rod drives another magnet (moving part) outside the piston rod. What I want to say is It has very high requirements for cleanliness. The rodless cylinder of the magnetic couple is often removed for gasoline cleaning, which may be related to its working environment.

There is a piston in the rodless cylinder, but there is no piston rod, the piston is installed in the guide rail, the external load is connected to the piston, and the actuation depends on the air intake. The magnetic coupling movement is realized by using the permanent magnet in the hollow piston rod to drive another magnet outside the piston rod. Because of its high speed and high load, the inner and outer magnetic rings are easy to disengage, so it is less used now. The size of its load mass needs to find the characteristic curve of its mass and speed. Now the mechanical type is more used.
The working principle of the rodless cylinder and the difference with the rod cylinder


Classification of rodless cylinders

Rodless cylinders are divided into magnetic couple rodless cylinders and mechanical contact rodless cylinders. A rodless cylinder refers to a cylinder that uses a piston to directly or in a way connects to the outside world and makes it follow the piston to achieve reciprocating motion. The biggest advantage of this cylinder is to save installation space.
1. Magnetically coupled rodless cylinder: The piston drives the moving body outside the cylinder to move synchronously through magnetic force. Its working principle: A set of high-strength magnetic permanent magnet rings are installed on the piston, and the magnetic lines of force pass through the thin-walled cylinder tube to interact with another set of magnet rings sleeved outside. Because the two sets of magnetic rings have opposite magnetic properties, they have strong attraction. When the piston is pushed by air pressure in the cylinder, under the action of magnetic force, the magnetic ring sleeve outside the cylinder is driven to move together. The thrust of the cylinder piston must match the suction of the magnetic ring.

2. Mechanical contact rodless cylinder: A groove is opened in the axial direction of the cylinder tube, and the piston and Shangzhi move on the upper part of the groove. In order to prevent leakage and dustproof needs, stainless steel sealing tape and dustproof stainless steel tape are used at the opening to fix the cylinder heads at both ends. The piston frame passes through the groove to connect the piston and Shangzhi into one. The piston is connected with Shangzhi to drive the actuator fixed on Shangzhi to reciprocate.

The difference between a rodless cylinder and a rod cylinder

1. Rodless cylinder: space saving, high direct load, self-guided, cantilever load, variable stroke, end cover can be rotated by 4 x 90°; the same driving force at both ends, air intake at one end, light weight, The magnetic piston is a standard part, and the sensor can be installed on three sides. Built-in adjustable air buffer, long-term effective lubrication, good running and stopping performance, avoid crawling like a low-speed cylinder, poor sealing performance, and prone to external leakage. Large driving force can reach 3450 N, high reliability and running performance, easy to maintain, long life (8000 km), inexpensive, easy to install, easy to operate, widely used for clamping, push-pull lifting, and the cylinder extends longer than the cylinder Twice the stroke.

2. Rod cylinder: The bending of the piston rod will cause faster wear, no self-guided, different speeds of extension and retraction; poor positioning performance, because the force area on both sides of the piston is different, it is generally designed for The short-stroke piston rod rotates and cannot directly support the load.

 

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