Electric hoist can be divided into wire rope electric hoist and chain electric hoist. Compared with chain electric hoist, chain electric hoist has smaller volume, wider application range, more detailed details and higher price.
Comparison of braking types: the ring chain electric hoist adopts a newly designed generator, which is characterized by magnetic generation. It can brake while the power supply is cut off to ensure safety during lifting; The wire rope electric hoist adopts mechanical braking, and the brake pad is bonded in the aluminum brake drum for friction braking, which is easy to slide and noisy, and needs to be replaced regularly.
Comparison of structural features: the ring chain hoist is driven by gear box, and the coupling, connecting rod, fixed bearing, drum and rope guide are reduced compared with the steel wire rope hoist. The mechanism is compact, the instantaneous start is gentle, and the noise is less than 85dB, while the instantaneous start impact of steel wire rope hoist is large, and the noise is greater than 130dB; The total length is shorter and the left and right utilization space is larger.
There are many differences between ring chain electric hoist and wire rope electric hoist in terms of shape, characteristics, application and modification. Today, we will make a detailed comparison from the following aspects
The main components of the chain hoist are motor, transmission mechanism and sprocket, and the winding device is ring chain; The main components of wire rope electric hoist are motor, transmission mechanism and drum, and the winding device is wire rope. Among them, the sprocket width is 1.6 times of the ring chain width, and when the lifting height of the steel wire rope is the maximum, it needs at least three turns to be completely wound on the drum to ensure safety and stability. Therefore, in terms of volume, the steel wire rope electric hoist is much larger than the ring chain hoist of the same specification, sometimes even more than ten times larger.
Электрическая Цепная Лебедка
The wire rope electric hoist drives the wire rope to rise and fall by the rotation of the drum. In this process, one side of the wire rope close to the drum bears pressure and the other side bears tension. Under the action of the two forces, the wire rope is easy to deform, and this deformation is inversely proportional to the drum diameter. Therefore, according to the design specifications, the drum diameter is at least 20 times of the wire rope diameter. The ring chain hoist is different from this. Because it relies on the rotation of the sprocket to drive the lifting of the ring chain, the ring chain is mainly subject to tension. Therefore, the extrusion strength can be reduced by setting more sprocket sockets. Generally, there are 5 to 6 sprocket sockets. Comparing the two, it can be seen that the diameter of the drum and pulley block of the steel wire rope electric hoist is much larger than the sprocket and combination diameter of the ring chain hoist, that is, under the premise of the same specification, the lifting height of the rail ring chain hoist with the same height will be greater than that of the steel wire rope electric hoist.
The wire rope electric hoist must be parallel to the center line of the running track. If the ring chain hoist is installed in parallel, the running distance will be much larger than that of the wire rope electric hoist due to its volume and size advantages. In addition, the axis of the ring chain hoist can be 90 degrees to the center line of the track during installation, which is convenient and flexible. Especially when the lifting height is large, the drum size of the wire rope electric hoist is large, This difference will be more obvious.
The wire rope electric hoist relies on the winding of the wire rope on the drum for lifting control. With the axial arrangement and winding process of the wire rope, the hook will also produce horizontal displacement along the axis, and the displacement is directly proportional to the lifting height. When the lifting height is large, the error will become more and more obvious. The hook of the chain hoist always follows the plumb line of the chain, with little horizontal displacement, which can achieve accurate positioning.
The refitting of the chain hoist is very convenient, which has nothing to do with the lifting height. The design of different chain hoist models is the same. During refitting, it can be realized only by changing the length of the chain. It can also be directly extended by welding on the short chain by professional technicians. This design operation is very simple. In contrast, the wire rope electric hoist model is closely related to the lifting height, so it can not easily realize the refitting work like the former. If the lifting height changes, the corresponding model will be idle, resulting in waste and increasing the depreciation.
According to the relevant technical specifications, the electric hoist should be in a vertical or horizontal state during use to avoid the inclined pulling of heavy objects. However, in the summary of practical application, the inclined pulling of the electric hoist is inevitable. The connection mode between the steel wire rope electric hoist and the running trolley is rigid, which is very easy to cause damage to the rope guide under the condition of excessive inclined tension, If the device fails to shut down in time, the motor may be broken and the whole steel wire rope electric hoist may be damaged. Therefore, the general manufacturer will expressly stipulate in the product manual that the inclined angle of the steel wire rope electric hoist to the rope groove shall be within 3.5 degrees.
The winding device of steel wire rope electric hoist is steel wire rope, which has certain rigidity. It is easy to get out of the groove under no-load. This situation is more likely to occur when small weight is lifted or heavy objects are transported outside the support, resulting in rope disorder. The winding device of the chain hoist is a ring chain, the winding mode is hinged, there is no rigidity, and the above phenomenon will not occur.
During the lifting process of the electric hoist, one side of the steel wire rope bears tension and the other side bears pressure. In order to avoid repeated nest folding, weaken the performance of the steel wire rope and ensure its service life, the winding direction of the steel wire rope on the drum and sheave shall be consistent, so that the side bearing pressure is always under pressure and the side bearing tension is always under tension. The ring chain hoist does not need to consider this problem. The winding direction of the ring chain on the sprocket can be set at will, with high flexibility and reasonable structure, which is also one of the reasons for the small overall volume of the ring chain hoist.
The steel wire configured for the wire rope electric hoist is often thin, and the lifting equipment itself may work in extreme environmental conditions, such as humidity, acid mist and high temperature. In this case, the thin steel wire is very easy to break, shorten the service life of the steel wire rope, and may also lead to safety accidents. The steel wire section of the chain hoist is relatively large, and its core material is often high temperature resistant Antioxidant type, which is not easy to produce great changes in harsh environment.
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