SG SJA SJB Screw Jack

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SG screw jacks, also known as SJ screw jacks, are divided into SJA and SJB types.

SJA screw jacks (SJA screw lifters) are widely used in industries such as machinery, construction, water conservancy, and metallurgy equipment. They have many functions, including lifting, lowering, and, with the aid of auxiliary parts, propulsion, tilting, and height adjustment. SJA worm gear screw jacks (SJA screw lifters) are a basic lifting component with many advantages, including compact structure, small size, light weight, wide range of power sources, convenient installation, no noise, multiple functions, various matching types, flexible use, high reliability, and long service life.

SJA Screw Jacks (SJA Helical Jacks) Features:

Thrust Range: 0.5-30 tons

–Stroke up to 8m, but screw stability and guide mechanism must be considered.

–Duty cycle 30%, which can be increased appropriately for lower load rates.

–Lifting speed less than 1500mm/min (23mm/s), up to 46mm/s in special cases.

–Efficiency less than 33%, with self-locking function; high reduction ratio L1 guarantees self-locking.

–Precise positioning; with an anti-backlash device, accuracy can reach 0.05mm.

–High synchronization; the same motor can drive multiple screw jacks simultaneously, achieving mechanical synchronization.

–Can be equipped with encoders, limit switches, dust covers, safety nuts, reducers, ordinary motors, servo motors, stainless steel materials, etc.

–Simple operation and maintenance, low noise.

The jack's square recessed housing increases heat dissipation and extends grease life. The ductile iron housing material significantly improves the housing's strength and performance, and allows for wide application in high/low temperature conditions. A square tail cover design prevents the screw from rotating on its own. Processing equipment and assembly processes guarantee high product quality, featuring strong impact resistance, high strength, low noise, long lifespan, and compact size.

Modular design enriches product versatility; screw jacks can be directly combined with motors/gear motors/non-standard accessories in any way. The integrated design provides customers with thousands of easy options.

The SJB series worm gear screw jacks are widely used in machinery, metallurgy, construction, and water conservancy equipment industries, offering numerous functions including lifting, lowering, auxiliary component propulsion, reversing, and various height adjustments. The JWM worm gear screw jack is a basic lifting component with advantages such as compact structure, small size, light weight, wide range of power sources, no noise, easy installation, flexible use, multiple functions, various matching forms, high reliability, and long service life. It can be used individually or in multiple units, accurately controlling and adjusting the lifting or propulsion height according to a specific program. It can be directly driven by an electric motor or other power source, or manually. It has different structural and assembly forms, and the lifting height can be customized according to user requirements.

Product Data

Applications

1. Lifting, displacement, clamping, and tilting actuators in production lines

2. Devices and clamping, lifting, and tilting devices in metallurgical equipment

3. Car lifts, flexible tooling, and welding lifts in the vehicle manufacturing industry

4. Lifting devices for monocrystalline and polycrystalline silicon ingot furnaces and solar power tracking devices in the photovoltaic industry

5. Remote control actuators for aerospace, defense, and astronomical telescopes

6. Lifting devices for lifting stages

7. Various actuators in shipbuilding, water conservancy, food and warehousing, casting, medical machinery, woodworking machinery, and food machinery industries

8. Lifting devices on vertical lathes and gantry milling machines

Advantages

Low speed, low frequency: Primarily used in applications requiring high loads, low speeds, and infrequent operation.

Load holding: The trapezoidal lead screw has an automatic locking function, maintaining the load even without a braking device.

Note: Under significant vibration or impact loads, the self-locking function may fail; in this case, an external braking device should be added.