L68B2 Mast SectionLifting Height limiter of tower crane, rotating position limiter of tower crane
The Tower Crane raises the height limiter, the tower crane turns the role of the limiter. Lifting Height limiter: the lifting height limiter is used to avoid possible control errors. Avoid lifting the crane boom structure damage, falling to prevent the drum on the rope loose or even in the opposite direction around the drum. For the boom type luffing tower crane, the lifting height limiter is usually composed of a touch lever, a lever, a spring and a stroke switch, and is usually fixed at the end of the boom. The weight is connected to the lever of the terminal switch by a steel wire rope of the hook ring and the restrictor. When the weight is in a malformed position, the terminal switch contacts are closed. If the hook comes back up, holding the weight and rising slightly to get rid of the weight, the lever of the terminal switch moves at an angle under the action of the spring, causing the control loop contacts of the lifting mechanism to break off and the hook to rise. The lifting height limiter is individually installed at the end of the reel shaft of the lifting mechanism for the lifting tower crane of the boom of the car's amplitude changing degree. The multi-function position limiter is composed of transmission system speed-down installation and travel switch.
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The position limiter is mounted at one end of the reel and driven directly by the reel. It can also be driven by the cogs and pinions fixed on the reel. Rotary limit device: the most commonly used rotary limit device is a device with a reduction device limit switch and pinion composition, the limit device fixed in the tower crane slewing support structure, pinion and large gear slewing support. When the upper part of the tower crane is moved by the electric idea of the turning structure, the Pinion of the rotary positioner is driven to roll by the big gear ring, and the number of turning turns of the tower crane is recorded. The speed reducer of the positioner drives the CAM The bump on the CAM presses down the fretting switch, thus blocking the corresponding rotary control loop and ending the rotary activity.
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