Key Factors to Consider When Purchasing a Screw Jack Lifting System

Introduction

What is a Screw Jack Lifting System? A screw jack system is a mechanical system that precisely converts the rotary motion of a motor/manual operation into linear lifting/pushing motion through a worm gear reducer and screw nut helical transmission. Its core advantages are heavy load capacity, self-locking, stability, and reliable positioning, making it widely used in industrial lifting and precision positioning. Traditionally, it refers to worm gear jacks, but through continuous upgrades, it has evolved into rack and pinion jacks, electric linear actuators, and electric servo cylinders.

Typical Applications in Industrial Fields (Automation Equipment, Heavy-Duty Lifting, Platform Adjustment, etc.)

Automation equipment, such as the lifting device on a large piece of equipment. Logistics lifting platforms, sluice gate lifting devices, and many other industrial applications utilize this system.

Potential Problems Caused by Improper Selection (Low Efficiency, Short Lifespan, Safety Risks)

During the selection process, salespeople may repeatedly ask many questions, such as the lift's load, stroke, and speed. These data need to be technically calculated to ensure the lift can operate normally and its lifespan can be calculated. Regarding the head of the lifting platform, he determined the connection method between the lifting platform and the load. Anti-rotation ensures that the lifting platform can be used normally even when not fixedly connected to the load. A self-locking function ensures that the load remains stable and does not fall in the event of a sudden power outage, preventing personal injury and property damage. So how do you choose a suitable lifting platform? Consider the following aspects:

Define your application requirements (first step in selection)

1. Load Capacity

Load capacity is the most critical factor in determining the lifting platform model, determining whether the chosen lifting platform can be used normally under your working conditions.

Difference between Static Load and Dynamic Load

Static load (static load) is the load borne by the lifting platform when it is stationary and moving at a very slow, uniform speed. It is only subject to gravity, without impact or acceleration.

Dynamic load lifts bear loads during lifting operations that include their own weight, inertial forces, and impacts, resulting in greater and more complex stresses.

Generally, a lift's static load capacity is greater than its load capacity. Therefore, when selecting a lift, you cannot determine the load capacity solely based on the weight of the object you are lifting; you must consider inertial and impact forces. You can provide the weight and a description of the working conditions, and Lude Transmission has a professional team to help you select the appropriate model.

The Importance of the Safety Factor (Generally Recommended: 1.5–2 times)

Typically, the load you provide will be multiplied by a safety factor to ensure the selected lift model is safe and stable.

2. Lifting Stroke and Height

Lifting Stroke: Effective travel distance (S) of the lead screw from lowest to highest position

Installation Height / Total Height: Equipment installation space + lift body length + stroke allowance

Impact of Stroke Length on Structural Design

Lead screw stability (slenderness ratio): Prone to instability, swaying, and eccentric bending. Therefore, it is necessary to increase the lead screw diameter, add guides, and reduce the operating speed.

Overall rigidity and positioning accuracy: Under long strokes:

Repeated positioning accuracy decreases. Sensitive to lateral forces, prone to tilting and jamming. The structure needs reinforced support, guide rail guidance, and multi-machine synchronization.

3. Operating Speed Requirements

Speed requirements for different applications (low-speed heavy load vs. high-speed light load)

Low-speed heavy load scenarios (mainstream applications of screw jacks)

Typical speed: 0.1～0.5 m/min (6～30 mm/s)

Characteristics: High load, accurate positioning, self-locking required, smooth and shock-free operation

Typical speed: 1～5 m/min or even higher (60～300 mm/s and above)

High-speed light load scenarios (efficiency priority, rapid reciprocating motion)

Characteristics: Smaller load, frequent movements, pursuit of efficiency

Choosing the appropriate screw jack type

1. Trapezoidal Screw Jack (Machine Screw Jack)

Advantages: Good self-locking, low cost

Applications include photovoltaic furnace lifting, automotive tooling positioning, gate opening and closing, long-term pressure holding support, and other low-speed heavy load applications requiring safe self-locking.

2. Ball Screw Jack

Advantages: High transmission efficiency (over 90%), low heat generation; high positioning accuracy, low wear, and long lifespan.

Applicable Scenarios: Automated production lines, precision testing equipment, high-speed reciprocating mechanisms, servo linkage platforms, and other high-frequency, high-speed, and high-precision applications.

Selecting the appropriate ball screw based on different working conditions requires considering factors such as efficiency, lifespan, price, and maintenance costs.

In addition, it's necessary to consider whether the system configuration is suitable for single-unit or multi-unit operation. Choose between a standard motor and a servo motor based on budget, and between manual and electric drives based on working conditions.

Environmental factors must also be considered, including the effects of temperature and humidity, dustproof, corrosion-resistant, and protective levels, installation space limitations, maintenance, and service life.

Can it be customized?

Lude Transmission supports customization.materials, stroke, and head can all be customized.

What is the delivery time?

Generally, it's 30 business days after placing the order. Rush orders can be arranged.