Classification and Selection of Gate Sharing Proximity Switches
Date: 2016-01-19Read: 6
Classification and selection of position switches:
In automation control equipment, it is often necessary to determine the movement position of the equipment, such as the limit and protection limit of mechanical equipment movement, the extension and retraction signals of the cylinder, etc., which are all used to determine the movement position of the equipment.
Two types of components used to determine the position of movement:
1. Contact switches, we call them travel switches or limit switches. It is mainly a master electrical device that uses the collision of certain moving parts of production machinery to issue control commands. It is mainly used as an automatic control device to control the direction, speed, stroke size or position of production machinery. Common examples include limit switches used on vehicles to change the direction of operation.
2. Non contact travel switch, we call itproximity switch，proximity switchAlso known as a contactless travel switch, it emits an action signal when an object approaches it at a certain distance. Unlike mechanical travel switches that require mechanical force, it obtains signals through changes in the energy of the medium between its probe and the object being measured.proximity switchIts application is extremely extensive and has exceeded the scope of limit and protection. Commonly used applications include measuring speed, controlling liquid level position, detecting metal objects, and so on.
The working principle and advantages and disadvantages of the travel switch:
The working principle of a contact type travel switch is relatively simple, with normally open and normally closed contacts inside. It is mainly driven by the contact rod of the switch when some moving parts of the production machinery collide with the switch, causing the closed contact to break or the open contact to close. Control the operation of circuits and mechanisms by changing the state of switch contacts.
For the use of contact type travel switches, the main advantages are as follows:
1. Regardless of the material, as long as the operating force reaches a certain value, the switch will be activated.
2. It adopts a contact output method, which can output differently with different external voltages without any leakage phenomenon.
3. Not affected by adjacent sensors, stable output.
It also has the following drawbacks:
1. Contact type, so it may cause wear and damage to the detection object. It is not recommended to use this method for precision objects
2. Contact type, with limited mechanical lifespan.
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