Limit Switch
Limit Switch

Limit Switch

Limit switch, also known as travel limit switch, is used to control the travel and limit protection of mechanical equipment. In the actual production, the travel limit switch is installed in the pre-arranged position. When the module installed on the moving parts of the production machinery hits the travel limit switch, the contact action of the travel limit switch realizes the switch of the circuit.
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Lift Elevator Parts



Elevator Switches


Limit switch, also known as travel limit switch, is used to control the travel and limit protection of mechanical equipment. In the actual production, the travel limit switch is installed in the pre-arranged position. When the module installed on the moving parts of the production machinery hits the travel limit switch, the contact action of the travel limit switch realizes the switch of the circuit.
Therefore, the limit switch is a kind of position according to the moving parts of the trip and switching circuit of the electric equipment, its action principle and button similar to limit switches are widely used in various types of machine tools and lifting machinery, used to control the schedule for terminal limit protection in the elevator control circuit, also use travel limit switch to control switch of the speed of the car door automatic doors limit, the capsules Lower limit of a protection limit switch is used to limit the movement limit position of machinery and equipment of electrical switches

This switch contact type and non-contact contact is more intuitive, on the moving parts of mechanical equipment, installation of limit switch, and its relative motion block is installed on the fixed point of the limit position, or the opposite position When the mechanical contact of the limit switch touches the block, the control circuit is cut off (or changed), and the machine stops running or changes operation. Due to the inertia movement of the machine, the travel switch has a certain amount of overtravel to protect the switch from damage

Generally at the top and bottom of the elevator shaft are equipped with a row of control switches, used to slow down and control the elevator stop.
According to the direction of the elevator running first hit the forced deceleration switch ———— upper (lower) limit switch
———— limit switch.

If the speed of the higher elevator deceleration switch will be divided into a deceleration switch and two deceleration switch or more. The elevator car hit the deceleration switch to perform deceleration action.

When the elevator car hits the upper (lower) limit switch, it immediately stops moving up (or down), but can still move down (or up).

When the elevator car touches the limit switch, the control circuit will be cut off immediately and the car will stop running. Neither upper nor lower can be operated. The elevator can only operate after the car is removed by external force and the limit switch is reset.

To control the speed of the door, the micro-switch was used to control the serial resistance to realize the change of speed, and the micro-switch was used to disconnect the power supply of the door machine at the terminal. Most elevators now use variable frequency door machine to control the speed of the door and the limit of automatic opening and closing. This is only the general principle, the specific form of each manufacturer will have some differences

Ningbo Lilong Elevator limit switch, including shell and oscillating rod, installed on the switch bracket shell including installation and setup in the installation of the plastic cover on the body, as described in the plastic cap body on one side of the card after the installation seat, on the other side by locking a lock on the installation seat, described in the middle of the oscillating rod with its installation installed in the seat of the piece, one end of the swinging rod set described in Ann In the mounting seat, the other end is arranged outside the mounting seat, and one end of the swinging rod is arranged in the mounting seat. The utility model has the advantages of small space, convenient disassembly, convenient maintenance, stable overall structure and high safety performance..


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