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Usually installed at either end of the size of the car.
Can be divided into positive and negative 90 ° rotation and
positive and negative 180 ° rotation, can achieve the size of the
car in single / double speed limit control.
General 1-shaped limit, a car on a single body to use 2, two-speed
to use 4, but the font limit only 1 can be used.
For example, the FCR006 limit switch is used to control the distance of the workbench on the crane, usually in the following order: When the crane moves forward to the limit distance, the ECR006 is activated to cause the motor speed to drop until the operation is completely stopped and the conversion Commutation circuit. The motor will move in the opposite direction (rear).
When crane are in the state of operation, it is inevitable to have
some driver operating errors, the phenomenon of control failure
occurred. In order In order to avoid the occurrence of such things,
must be installed in the various mechanical protection device -
limit device
Usually when the work machine reaches the end of the role. It is
also known as terminal switch. The function of limited switch and
travel switch is similar, they also have difference. The stroke
switch is to control the travel of the machine and only stop
operation, while the limited switch is to control the position of
the work machine and have two speed which means before stop
operation, limited switch will decelerate. In this way, it can
ensure waorking safety. For example, the limit switch in the gantry
planer controls the position of the planer table. When the table to
move to a close to its limit position, the limit switch will move,
change the control circuit, forcing the table reverse movement, so
as to avoid the table indefinitely move in one direction and out of
the base.
Limit switch is a commonly used small current master electrical
appliances. The use of the production of mechanical moving parts of
the collision to make its contact to achieve the opening or
breaking control circuit, to achieve a certain control purposes.
Typically, such switches are used to limit the position or stroke
of mechanical movement, so that the movement of machinery according
to a certain position or stroke automatically stop, reverse
movement, variable speed movement or automatic round-trip movement.
In the electrical control system, the limit switch is to achieve
the role of sequential control, positioning control and position of
the state detection. Used to control the travel and limit
protection of machinery and equipment. Construction: consists of an
operating head, a contact system and a housing.
In the actual production, the limit switch is installed in the
pre-arranged position, when installed in the production of
mechanical moving parts of the module hit the trip switch, the
limit switch contact action to achieve the circuit switch.
Therefore, the trip switch is a movement of the parts according to
the location of the switch circuit of electrical appliances, and
its role is similar to the principle of the button.
Limit switches are widely used in various types of machine tools
and lifting machinery, to control its travel, the terminal limit
protection. In the elevator control circuit, but also the use of
travel switch to control the speed of the car door, automatic door
opening limit, car upper and lower limit protection.
The limit switch can be mounted on objects that are relatively
stationary (such as fixed frames, door frames, etc.) or moving
objects (such as traffic, doors, etc.). When the animal is close to
still life, the contact of the switch's drive switch causes the
closed contact to break or break the contact closed. By the switch
contact opening and closing state changes to control the circuit
and the action of the body.
Maximum Actuation speed | 1.5m/s | |
Mechanical life | 200 million times | |
Minimum action force | Torque for Tripping | 0.5N.m |
Torque for Positive Opening | 0.75N.m |