Fast speed, high frequency, long stroke operating conditions crane accident control

 Some  overhead gantry crane  main and running faster, and frequent starts and lifting height often close to or reach the limit height, in this case the work of the crane, must require limiting devices that can be both sensitive and reliable and accurate positioning. Now for the overhead crane L × 7-1 type limit switch is superior to the ordinary foot-in limits and rope touch the swing rod limit device, because it and the cylinder between the gears to avoid foot-in limits and swinging rod limit means some shortcomings, however, the switch is used for such work under the conditions of inadequacies,bridge gantry crane which can not be permanently accurate positioning, prone to sudden failure caused by "over volume" accidents. This is due to its positioning means is the slice modular adjust positioning is by spring pressure to keep the recovery position. However, relying on a small spring pressure, in this fast speed, often touching the conditions it is impossible to maintain long-term change. So, how to resolve this contradiction? The analysis research, the switch can be a positioning link from the original combined into the overall style, you can ensure that in any case for a long time, accurate positioning.hoist crane Attendant brought unable to adjust positioning by volume unscrew three foot screws, it will switch rotate an angle so that the passive wheel and driving wheel disengagement, adjust positioning and then reset robust methods to solve (this switch Dimensions little as 16cm × 9cm × 18cm, easy to operate). This approach by the practice works well.