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Overhead gantry crane  installation site and the work conditions is vary greatly, the use of lifting capacity and working frequency are also different. In order to use the crane economically and reasonably, it is necessary to choose the appropriate working level according to the working condition of the crane. The working level of the bridge crane is divided into A1 ~ A8, according to the level of the crane and the load state, that is, according to the frequency and load degree of the crane through the calculation to determine. The crane has a certain number of working cycles during its useful life. A working cycle of a  travelling gantry crane  is to start the process of loading the goods from the beginning to the next. The total number of working cycles represent the utilization of cranes. In order to facilitate the calculation, the total number of working cycles can be divided into 10 categories. 200-400 ton heavy duty travelling  overhead gantry crane for ...

The overhead crane in workshop should not use mechanical lifting, because the top of the rail is close to the bottom chord of roof truss, in addition, the volume and weight of the heavy duty gantry crane are large. Small and medium sized overhead travelling gantry crane used single mast upright integral hoisting, which can improve work efficiency, shorten the construction period, reduce high-altitude operations, the construction procedures are as follows. Erecting mast 1.The height of the mast The maximum height of the mast is the height from the ground to the roof, minus the operating space between the top of the mast to the roof panel and the height of the sleeper. Minimum height should meet the needs of lifting height. 2.Mast position Since the mast is to be erected at the center of gravity of the travelling gantry crane between the two main girders of the trolley, the trolley must be biased, and the mast should also deviate from the centre line of the plant. The deviatio...

1.Tap: For the need of power grid operation of the explosion proof electric hoist, the general transformer high voltage side has the tap, can not fully guarantee the synchronous switching of tap changer, so the load voltage transformer can not be parallel operation. 2.Voltage transformer: the primary winding turns more than N1, the secondary winding turns less than N2, equivalent to a step-down transformer. When PT is working, the primary winding and the secondary winding are respectively connected with the voltage loop of the primary circuit and the two control loop in parallel. So if the secondary winding short circuit, it will lead to a very large two side current. 3.Hand cart / drawer: hand cart and drawer are part of the high voltage switch cabinet and low voltage switch cabinet. They are basically the same with the fixed switch cabinet, the main difference is the convenience of maintenance and repair. WOKAITE explosion proof electric hoist Explosive-proof grade：Ex de IIB T...

Recently there are some customers inquiry  chain hoist block , but is not very clear described by the customer, and after communicating with customer patiently, we understand what customers want is the rotary hook on the  manual hoist . About the doubts about the rotating hook and chain hoist block, following by WOKAITE explains the difference of the rotary hook and the manual chain fall for you. The lever hoist is used for guiding the user to operate the gourd from any angle, so as to avoid the operation standard of the ordinary  chain pully block  which can not be oblique pulled, and leading to the user work in the dangerous area. The rotary hook relates to the internal design of the lifting hook of an arbitrary rotation angle when lifting heavy objects. For example, in the hoist lifting weights, sometimes the hook opening towards the west, and we tied rope weight is in the direction of east-west, then if the hook can not rotate, and the lifted goods is heavy, i...

Any machine has the cycle and time of operation, is not suitable for a long time continuous operation. Long time operation will cause mechanical damage and even accidents, but in general if the 3 ton electric chain hoist surface temperature is too high, we need to check what is the reason. Firstly to check whether it is because the electric hoist weight is too large, beyond the 3 ton electric chain hoist rated weight. Overweight operation will make the motor over heating, overload for a long time will cause irreparable damage to the electric chain hoists for sale.  Electric hoist motor  is not overloaded, but still heating, should check whether the motor bearing damaged; Should also check whether the motor Work according to regulations, which is one of the reasons causing the motor heating. When the electric hoist motor is running, brake clearance is too small, not completely disengaged, causing great friction, while the frictional heating is also equivalent to the additi...

Lifting height is the vertical distance from the ground to the highest lifting position. If the extraction device needs to fall to the below ground to work, the drop depth is the vertical distance between the location from the ground to the lowest position of the device. At this time, the total lifting height is the sum of the height above the ground and the depth below the ground. The lifting height is chosen according to the operating requirements. Overhead gantry crane will generally limit the lift height to less than 20m. Because if more than 20m, it is necessary to use the special wire rope winding on the hoisting mechanism, or increase the size of the drum, so that the crane trolley layout is difficult, and increase the size of the crane limit. To the crane for loading operation, when determine the lifting height, should also consider the attachment of the spreader and the height of the vehicle, in order to ensure the crane can load the items of maximum height into the vehicl...