When accurate parking is required, there is no stable low-speed crane, and its speed regulation performance is poor. The driver can only use the "point car" operation mode, which not only increases the labor intensity of the driver, but also greatly shortens the service life of electrical appliances and motors. Due to the increase of electrical connection and motor starting times, it has a serious impact on the mechanical structure.
Some bridge cranes have high requirements for accurate parking, and implement stable low speed to buy time for control to meet the standard requirements. Some cranes need to adopt program control, numerical control, remote control, etc. the application of these technologies must often realize the speed regulation requirements before it is possible to avoid the advantages and disadvantages of the speed regulation mode of bridge crane
Changing the parameters of the motor is that most of the speed regulation of bridge crane needs to be carried out during operation, and there are many times of transformation, so the mechanical speed regulation is generally not very suitable, and most of them need to adopt electrical speed regulation. Electrical speed regulation is divided into two categories: DC speed regulation and AC speed regulation.
The vast majority of Cranes use winding rope to lift goods, which leads to poor following performance (swing) of "goods". It is difficult to achieve high-precision positioning, resulting in the low automation level of the handling process. Therefore, anti swing and anti swing are also an index of crane speed regulation. Using slow speed and small acceleration to overcome swing is the primary stage of anti swing, which sacrifices production efficiency. It is a general situation of high-efficiency bridge crane to use the speed regulation system to control the acceleration of the running mechanism and destroy the swing cycle to stop the swing. A better speed regulation system uses angle detection equipment to form an angle closed-loop link, and uses the excellent speed regulation performance of dynamic indicators to follow the angle change of steel wire rope in the speed regulation process and keep the steel wire rope from swinging. This is called anti swing system, which can greatly improve the automation level and improve the system.
The speed of the bridge crane is uniform, stable, and the time is accurate. The speed adjustment is not the only condition for accurate displacement. It needs the support of perfect control system and a variety of software and hardware.
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