I. Introduction

In the application scenarios of industrial transmission equipment, the selection of screw jacks is of crucial importance, and among them, the relationship between the lifting force and the lifting speed is a key point that many customers are prone to be confused about.

II. Typical Questions from Customers

Recently, a customer has raised such a rather representative question:
For the SWL10 – M – 1A – II – 500 model of screw jack, when selecting the type, it was clearly chosen to be capable of lifting a 10-ton heavy object. But why can’t it achieve the effect of lifting 1 meter in 1 minute while lifting a 10-ton heavy object? Logically speaking, it seems that it should be achievable.

III. Elaboration on the Relationship between Lifting Force and Lifting Speed

(I) Relationship Characteristics

Actually, this involves an important characteristic of screw jacks, that is, there is a close correlation between the lifting force and the lifting speed.

(II) Pattern Presentation

Simply put, once the worm gear and worm speed ratio of the screw jack is determined, such a pattern will emerge: the faster the lifting speed, the lower the actual lifting capacity of the SWL screw jack.

(III) Example Illustration

Let’s take the SWL10 – M – 1A – II – 500 model mentioned by the customer as an example to illustrate in detail.

Model Parameters:

For this model of screw jack, its reduction ratio is M = 24.

Theoretical Lifting Speed:

In this case, if the theoretical lifting effect of 10 tons is to be achieved, after precise calculation, the fastest theoretical lifting speed can be controlled at 0.288 m/min. (It should be specially noted that during the actual operation process, the influences of various external forces such as friction should also be fully considered, and the actual achievable speed may be slightly lower than this theoretical value.)

(IV) Changes in Lifting Capacity at Different Speeds

Next, let’s look at the changes in the actual lifting capacity under different lifting speeds.

If the speed is increased to 0.42 m/min, at this time, the SWL10 model of screw jack can only lift a 5-ton heavy object, which has dropped significantly compared to the originally expected 10 tons.
If the speed is further increased to 2.59 m/min, the weight of the heavy object that the SWL10 model of screw jack can lift is only 1 ton left, and its lifting capacity is only one-tenth of the initially expected.

(V) Relationship Summary

It can be seen from this that the change in the lifting speed has an extremely significant impact on the lifting capacity of the screw jack, and an obvious inverse relationship is presented between the two.

IV. Relationship between Motor Power and Lifting Weight, Lifting Speed

Moreover, in the process of selecting screw jacks, motor power is also a key factor that cannot be ignored, and it is also closely related to the lifting weight and the lifting speed.

(I) Inverse Relationship

When the motor power is determined to be a certain value, an inverse relationship will be presented between the lifting weight and the lifting speed.

(II) Influence Explanation

That is to say, on the premise that the motor power is fixed, if you want to increase the lifting speed, then correspondingly, you have to reduce the weight of the heavy object that can be lifted; conversely, if you want to lift a heavier object, you must appropriately reduce the lifting speed to ensure that the entire screw jack system can operate normally and fully exert its due performance.

V. Selection Suggestions

In view of these complex relationships among the lifting force, the lifting speed and the motor power, extra caution is required when selecting screw jacks.

(I) Acquisition of Reference Materials

If you encounter any problems during the selection process, you may as well first browse the official website of Shanghai Dianmai Transmission Technology Co., Ltd. There are abundant product information and related technical materials available for reference.

(II) Consulting Methods

Of course, you can also directly contact us by telephone. Our professional team will provide you with detailed answers and accurate selection suggestions to avoid bringing many inconveniences and potential risks to the subsequent use due to improper selection.

(III) Acquisition of Detailed Parameters

In addition, if you need to obtain more detailed parameter information of the lifting force and the lifting speed table, you are also welcome to contact us at any time. We will wholeheartedly provide you with all the materials you need to help you make the correct selection decision.

The Relationship between the Lifting Force and the Lifting Speed of Screw Jacks