Measuring device for bridge crane, bridge crane and measuring method

Abstract

The invention discloses a measuring device for a bridge crane and a bridge crane measuring method. The measuring device comprises a length measuring device and a first transmission part, the first transmission part is used for winding a first lifting rope, one end of the first lifting rope is connected with a rotating shaft of a lifting motor, the other end of the first lifting rope is connected with a lifting appliance, and after the rotating shaft of the lifting motor is started, the lifting appliance can ascend and descend; a second transmission part, wherein a second lifting rope is wound on the second transmission part; any one of the first transmission part and the second transmission part can rotate after being driven by the outside and drive the other one to rotate; a cylindrical pole plate connected with a free end of the second lifting rope; a first cylindrical pole plate sleeved on the cylindrical pole plate; a second cylindrical pole plate sleeved on the cylindrical pole plate; and when the cylindrical pole plate moves up and down in the first cylindrical pole plate and the second cylindrical pole plate, the capacitance value of a first differential capacitor changes, and the ascending or descending length of the lifting appliance can be calculated according to the changed capacitance value.

Description

technical field [0001] The invention relates to the field of bridge cranes, in particular to a measuring device for bridge cranes, bridge cranes and a measuring method. Background technique [0002] Since the annual throughput of various port terminals is increasing rapidly, in order to expand the carrying speed and efficiency of port containers, simply increasing the port berths is far from meeting the transportation demand. Therefore, a double-lift double-slinger bridge crane device was proposed. Compared with the traditional single-slinger bridge crane, it can lift two 40-foot or four 20-foot containers at a time, greatly reducing The loading and unloading efficiency of the container is improved. The double spreader bridge crane requires synchronous and coordinated operation of the double spreaders when loading and unloading goods, but due to the coupling effect between the double spreaders and external interference and friction, there is an error between the double spre...

AI Technical Summary

Problems solved by technology

These measurement methods have many disadvantages, such as visual errors and low detection accuracy.

[0004] At the same time, due to the complex structure of the double-lift double-sling bridge crane, various working methods and coupling, coupled with the wind force in the real environment and the movement of the trolley will cause the suspension rope to sway, it is necessary to anti-sway the bridge crane Control, and one of the key issues in the anti-sway control of bridge cranes is the detection of the swing angle

Most of the existing swing angle detection methods can be divided into contact and non-contact measurement. The contact swing angle detection method is measured by an encoder, but this measurement method is not accurate and has a dead zone problem, which affects the accuracy of the measurement. effect, maintenance is inconvenient; the non-contact pendulum angle detection method often uses a laser angle meter, which has high requirements on the working environment and is expensive

At the same time, the existing bridge crane operators often obtain the swing condition by visually observing the spreader and the load, which has low accuracy and potential safety hazards, which affects work efficiency and work quality

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