Topless 12Ton Tower Crane Flat Top

Description Specification

Topless 12Ton Tower Crane , Flat Top 12Ton Tower Crane

Model: TCT7020 ,12Ton

Jib length: 70m

Max load: 12Ton

Tip load: 2.0Ton

Mast type: 2m , L68B2 Mast Section

Type, Stationary , Inter Climbing , Travelling.

Topless 12Ton Tower Crane , Flat Top 12Ton Tower Crane

Tower Crane Knowledge sharing：

The cause of the slide hook, a simple circuit to prevent the tower crane from idling slide hook

The hollow slide hook of tower crane is very dangerous, especially when it changes from high speed to low speed in the descending process. Once the slide hook appears, the light one will smash through the floor and destroy the equipment, and the heavy one will hurt the construction personnel. Why do slip hooks occur? In order to solve this contradiction, the tower crane manufacturers in the absorption of the advantages of the major companies on the basis of the circuit, design a simple circuit to prevent the tower crane idling slip hook.

Topless 12Ton Tower Crane ,

The reason is that there is a long time gap in the gear shift process (such as the gear shift gap of the linkage table is too long, the contactor coil is damaged, the delay head is aging and the delay time is getting longer, etc.In the control circuit of multi-speed motor, in order to prevent the occurrence of phase to phase short circuit in the process of gear shifting, must also design the neutral gear of 0.1 second or so, otherwise it will lead to circuit breaker trip or contactor burn to death.

Flat Top 12Ton Tower Crane

In the control loop of the lifting mechanisms braking motor, the normally open contactor of each gear is connected in series. Once the contactor of a gear does not close, the lifting mechanism will stop working.

There is a concern during each shift of this circuit, the brake motor will brake once due to a short power shortage. Will that cause damage to the brake motor and lifting mechanism

In our opinion, as long as the neutral time is in the appropriate range, it will not cause damage to the braking motor and lifting mechanism. Because braking mechanism has a braking distance, braking motor power in 0.5 seconds when the brakes to lock, if neutral time control under 0.2 seconds, just action without brakes, brake motor only when the gap time is greater than 0.5 seconds, the brake will truly work, also will appear everybody worries.

Flat Top 12Ton Tower Crane

Still, what does a gap of more than 0.5 seconds mean? That means a major safety hazard! Even if the brakes do damage to the lifting mechanism, that is the only option.