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How to ensure the reliability of the self-locking switch?

How to ensure the reliability of the self-locking switch?

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  • Time of issue:2021-07-06
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(Summary description)In the application of self-locking switches, according to the characteristics and characteristics of power switch electrical equipment, normally closed is an indispensable application, and normally op

How to ensure the reliability of the self-locking switch?

(Summary description)In the application of self-locking switches, according to the characteristics and characteristics of power switch electrical equipment, normally closed is an indispensable application, and normally op

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2021-07-06
  • Views:0
Information

In the application of self-locking switches, according to the characteristics and characteristics of power switch electrical equipment, normally closed is an indispensable application, and normally open is an indispensable application. Naturally, normally open or normally closed can also be selected. Must be disassembled and replaced in accordance with the original design plan, and do not make subjective judgments. The same is true for other self-locking switches. Both start and stop normally open and normally closed switches are available. Be sure to check when disassembling and replacing!

Whether operating an AC contactor or as an insertion point for a PLC, the self-locking switch must be in the "normally closed" state. Only in this way can the reliability of the self-locking switch work be ensured.

For the self-locking switch, I think the normally closed point can still be used, and the same is true when entering the PLC. When using the normally open point to guide the route, the emergency stop power switch will fail, and the actual effect of emergency stop cannot be achieved. Nowadays, many emergency stops that enter the PLC use the normally open point, which is considered inappropriate. It should be the normally closed point + the normally open point of the program flow.

1. Self-locking switch function

The self-locking switch is an automatic switch operated by a certain part of the body (usually a finger or palm), and is calibrated by elastic energy storage technology. It is one of the most common main household appliances. The current allowed by the contact of the self-locking switch is very small, usually not more than 5A. Therefore, under normal circumstances, it will not immediately manipulate the conduction of the main power supply circuit (large current power supply circuit), but transmit command data signals in the control loop (small current power supply circuit) to manipulate AC contactors, automotive relays, etc. Household appliances. For electrical appliances, they then manipulate the conduction of the main power circuit, function changes or the interlocking of household appliances.

2. Basic principles and signs of self-locking switch structure

A self-locking switch is usually composed of a self-locking switch cap, a calibration spring, a movable contact of an energy storage chain, a static contact, a supporting crankshaft and a housing.

When the contact is opened and closed, the self-locking switch will not be subjected to external force (ie static data). It is divided into terminal self-locking switch (that is, remove the self-locking switch), start self-locking switch (that is, remove the self-locking switch) and composite self-locking switch (that is, self-locking). Combine moving contact and disconnect contact to switch).

When the self-locking switch is subjected to external force, the opening and closing conditions of the contacts will change:

3. The meaning of the color of the self-locking switch

4. The model specification and meaning of the self-locking switch

5. Self-locking switch structure number

K —open type, embedded in the operation control panel;

H-maintenance type, with a maintenance shell, which can prevent internal parts from being damaged by mechanical equipment or accidentally touched by people to generate induction electricity;

6. The model specification and meaning of the self-locking switch

S—moisture-proof type, with a sealed shell, which can avoid the intrusion of precipitation;

F—Anti-corrosion type, which can avoid the entry of corrosive steam;

J — Emergency type, with a large red mushroom-shaped self-locking switch (highlighted), used for emergency disconnection of the switching power supply;

X knob type, use the knob to rotate for operation, there are two positions of open and closed;

Y-shaped lock key operation type, use the key to insert for operation, which can avoid misoperation or operation by full-time personnel;

D-Mouse cursor self-locking switch. The self-locking switch is equipped with a signal indicator, which is also used as a data signal indicator.

7. Choose a self-locking switch

1. Select the type of self-locking switch according to the application and the actual main purpose. For example, the self-locking switch embedded in the operation control panel can select the open type; the mouse cursor type that needs to display the information running status; the key operation method should be adopted in the key place to avoid the misoperation of the personnel. Use anti-corrosion type in places with corrosive steam.

2. Select the color tone of the self-locking switch according to the operating status indication and working conditions. For example, the activation self-locking switch may be white, gray or gray-black, and milky white or emerald green may be preferred. The self-locking switch should be red. The terminal self-locking switch can be selected from black, gray or milky white, preferably gray-black, or red.

3. The total number of self-locking switches must be selected according to the control circuit. Such as single button, double button and triple button.

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