In the field of industrial transmission, screw jacks, as an important type of reducer, play an indispensable role. They are widely used in lifting and lowering operations and can achieve functions such as pushing, overturning, and precise adjustment of various height positions with the help of accessories.

Screw jacks usually have a fixed lifting and lowering speed, which is not set randomly but is obtained through rigorous calculation. Specifically, it is determined based on key factors such as the input rotational speed of the motor, the speed ratio of the worm gear and worm of the jack, and the size of the screw thread.

For example, taking the standard model of jack SWL5 – P – 1A – II – 500 – FZ as an example, if a common four-pole motor is used as the input, the calculation method of its lifting speed is as follows:

The rotational speed of a four-pole motor is generally 1450 revolutions per minute.
It is known that the speed ratio of the worm gear and worm of this jack is 8, and the lead of the screw thread is 7.
According to the calculation formula, the lifting speed = the input rotational speed of the motor ÷ the speed ratio of the worm gear and worm × the lead of the screw thread, that is, 1450 ÷ 8 × 7 = 1268 mm/min. This is the standard lifting speed of this model of jack under the conventional configuration.

First, adjustments can be made to the reduction ratio.

For example, if the original speed ratio is reduced. Taking the example mentioned above, if the speed ratio is changed from 8 to 6, then the lifting speed is recalculated according to the new speed ratio: 1450 ÷ 6 × 7 = 1691 mm/min.

Through such an adjustment, we can find that the lifting speed is increased by more than 400 mm per minute, achieving a relatively obvious speed increase effect.

If you want to further increase the speed, for example, to achieve a lifting speed of more than 3000 mm/min, then the lead of the screw can be modified.

The specific practice is to make the screw double-ended, so that the lead will change from the original 7 to 14.

Recalculate according to the lifting speed calculation formula again: 1450 ÷ 6 × 14 = 3383 mm/min.

At this time, the lifting speed can already meet the needs of a higher speed. However, it should be noted that such a lifting speed is already close to the maximum lifting capacity of the screw jack. Because when the speed is further increased, the heating and wear conditions of the jack during operation will become very serious, which will not only affect the service life of the equipment but also may cause the equipment to malfunction. Therefore, in this case, it is not recommended to continue to increase the speed for use.

Shanghai Dianmai Transmission Technology Co., Ltd. has been focusing on the field of transmission equipment for a long time. Currently, it supplies various models of screw jacks in stock, which can meet the diverse needs of different customers for screw jacks. If you have any questions about screw jacks or have ordering requirements, you are welcome to contact us at any time. We will wholeheartedly provide you with high-quality products and professional services!