One type of travel switch, position switch (also known as limit switch), is a commonly used small current main electric appliance. The collision or control circuit is realized by the collision of the moving parts of the production machinery to make the contact action to achieve a certain control purpose. Typically, such switches are used to limit the position or travel of the mechanical motion, allowing the motion machine to automatically stop, reverse, shift, or automatically reciprocate at a certain position or stroke.
The travel switch is mainly composed of an operating mechanism, a contact system and a housing 3. There are many types of stroke switches, which are generally divided into direct-acting, rotary and micro-motion according to their mechanisms. The shape, structure and symbols of the common travel switch are shown in the figure below.
1 Determine the type of the stroke switch according to the use occasion and the control object.
When the speed of the production machinery is not too fast, the general purpose travel switch is usually selected; and when the path through which the production machinery travels is not suitable for the direct-acting travel switch, the camshaft rotary type of travel switch should be selected; Proximity switches should be used when the requirements for reliability and accuracy are high.
2 Select the protection mode such as open or protective according to the environmental conditions.
3 Select the series according to the voltage and current of the control circuit.
4 According to the movement characteristics of the production machine, select the structural form of the travel switch (ie operation mode).
Use of the travel switch:
When installing the 1 stroke switch, pay attention to the direction of the roller and not reverse it. The position of the collision with the retaining iron shall comply with the requirements of the control circuit and ensure reliable collision with the retaining iron.
2 It should be checked frequently whether the action of the travel switch is flexible or reliable, whether the screw is loose or not, and the fault should be eliminated in time.
3 The contacts of the travel switch should be cleaned regularly to remove grease or grime, and the worn parts should be replaced in time to avoid accidents and accidents.
Common faults and treatment methods of the travel switch:
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