Synchronizing circuit applicable to double suspension hoist

Abstract

The present invention relates to a synchronizing circuit applicable to a double suspension hoist, which comprises two rectifying plates, two speed-regulating valves, an electromagnetic change valve, and a double check throttle. The electromagnetic change valve and the double check throttle are connected in parallel between the two regulating valves and left and right cylinder oil circuits. The principle is that the pressure oil from an oil pump enters into the left and right oil cylinders of the hoist separately through the two speed-regulating valves and the two rectifying plates, enabling hoisting movements of the gate. By adjusting the two speed-regulating valves, the two cylinders can reach a preliminary synchronous state which is synchronous in speed. Then, by correcting the deviations through the small-sized electromagnetic directional valve and the small-sized double check throttle, the two cylinders can be in synchronous positions within an acceptable deviation range, and the route terminal will not get accumulated.

Description

technical field [0001] The invention relates to the hydraulic principle of a hoist with double hoisting points, in particular to a synchronous control circuit in a hoist with double hoisting points with large spacing between hoisting points. Background technique [0002] Large-scale hydropower stations and ship locks are often equipped with large-span and large-tonnage gates. Single lifting points can no longer make them work stably and reliably, and two-point lifting is usually required. The movement of the two oil cylinders fixedly connected with the lifting point should maintain the same displacement, and this requirement is called synchronization. [0003] What the hydraulic hoist operates is not a free-hanging heavy object, but moves up and down along the guide door slot or rotates around the hinge, so the opening and closing force of the two lifting points will be affected by the manufacturing and installation errors of the door slot. It is different from whether ther...

AI Technical Summary

Problems solved by technology

[0004] The traditional throttle valve or speed control valve synchronization circuit is simple and economical, but the synchronization accuracy is too low. It cannot meet the synchronization requirements for large-span and large-tonnage gates; When the actual flow rate is too much lower than the nominal flow rate of the valve, the splitting accuracy is significantly reduced

The synchronous circuit of the proportional valve and the servo valve can achieve high precision, but it is expensive and requires high oil cleanliness (the servo valve requires NAS6 level), so it is difficult to adapt to the working environment of the gate hoist.

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