Crane Limit Switch

 The crane limit switch is a safety device which including traveling limit switch and load limit switch. Traveling limit switch used both on crane and hoist or trolley. Load limit switch used on hoist and trolley.Traveling limit switch control the travel of the working machine, while the limit switch control the position of the working machine, and often the terminal position or limit position.

 

Limit Switch on Crane

Limit switches on crane usually cut the power to the drive motor when the crane moves beyond the travel limit. Usually installed traveling limit switch or cross limit switch.

Traveling limiter is an insurance device that prevents a crane from colliding or restricting the travel within a certain range. It is usually installed on the inside of the active platform, mainly to install a stroke switch that can be pushed. Another at the end of the track (running limit position) to install a fixed limit position of the baffle. When the crane operation to the position, limit baffle will touch the limit switch, cut off the control of the power of walking, then crane can only traveling to the opposite direction when closing.

Traveling Limit Switch on Crane

Electric single-girder crane travel limiter adopts adjustable mechanical memory structure so that it has reliable performance. Also,it has advantages of small size, multi-function, high precision, adjustable limit, versatility and maintenance of the installation and use of convenient adjustment and so on.

Traveling Limit Switch on Crane

Cross Limit Switch on Crane

Cross Limit Switch on Crane

Limit Switch on Hoist

Limit switches on hoist are safety devices that can cut power to certain functions of your hoist. hoist limit switches can be custom built to work with load limits, upper limits, and slack rope limits.

Traveling Limit Switch on Hoist

The electric hoist limit switch is used to limit the operation of the hoist crane in a certain safety range, and to install the protective electrical appliances which are controlled by the motor. The electric hoist limit device is installed on the hoist motor seat, which is used with the limit rod of the electric hoist itself, so as to achieve the purpose of rising and falling two-way limit.

Limit device by the fire limiter and guide rod composition. The stopper is installed on the lifting motor junction box for upper and lower limit protection of the hoisting mechanism. Its working principle is as follows: the wire rope guide board pushes the guide rod and then drives the fire limit switch to cut off the power of the lifting motor.

Traveling Limit Switch on Hoist

Load Limit Switch on Hoist

The load limit switch can be installed onto a hoist at the rope's dead end or equalizer sheave. It can be designed for other installations with a power reel or remote control.

The load limit device is activated from the deflection of the rope when the hook lifts the load. This increases the tension of the rope, which activates the limit device. The device can be electrically connected with the hoist's switch for either up or down motion, depending on the motion to be controlled. As well, it can work as both an upper limit switch and load limit switch as a special order.