Heavy equipment often needs small, deliberate adjustments during installation, production or maintenance. A screw jack provides progressive movement through a geared mechanical drive, helping operators bring a supported assembly to the required position.

Typical tasks include adjusting a machine bed, setting the height of a work platform or positioning a fabrication fixture. In each case, the jack must work with a suitable supporting structure and load guidance arrangement. The screw should carry the intended axial load without being forced to guide an unstable or sideways-moving assembly.

Working Principle

A worm gear screw jack combines a worm shaft, worm wheel and threaded lifting mechanism. Turning the input shaft drives the worm wheel, and the screw arrangement converts this rotation into linear travel.

The movement depends on the jack design:

• Translating screw arrangement: The lifting screw moves through the housing while being restrained against rotation.
• Rotating screw arrangement: The screw rotates, and a suitably restrained travelling nut moves along its length.

The gear ratio and screw lead determine how much travel occurs for each input revolution. These values also influence the required input speed and torque. Confirm the arrangement supplied with the Jyoti Hydraulic model before designing its mounting and drive system.

Key Features

• 20-ton nominal capacity designation: Intended for heavy-load applications, subject to configuration-specific operating limits.
• Worm gear transmission: Uses gear reduction to drive the lifting screw.
• Mechanical linear movement: Converts rotary input into controlled lifting, lowering or positioning.
• Progressive adjustment: Allows movement in increments determined by the screw lead and drive rotation.
• Machine integration: Can form part of a properly engineered lifting or positioning assembly.
• Application-based selection: Stroke, speed, drive and mounting requirements should be specified for the intended installation.

Technical Specifications and Selection Details

• Product name: Worm Gear Screw Jack 20 Ton
• Brand: Jyoti Hydraulic
• Nominal capacity: 20 ton; confirm the rated force and operating conditions in the quotation.
• Operating mechanism: Worm gear and screw drive
• Movement: Linear lifting or positioning
• Stroke length: Confirm according to the required travel.
• Gear ratio and screw lead: Confirm for the selected configuration.
• Input drive: Confirm manual or motor-driven compatibility.
• Lifting speed: Specify the required speed under load.
• Mounting orientation: Confirm suitability for the proposed installation.
• Screw end connection: Select to suit the load attachment.
• Duty cycle: Confirm permitted operating and resting periods.
• Construction materials and dimensions: Refer to the approved technical drawing.
• Load-holding provisions: Confirm self-locking characteristics and any brake or locking requirements.

Potential Applications

Subject to engineering checks, a 20-ton worm gear screw jack may be considered for:

• Height adjustment of industrial machinery and equipment.
• Lifting and positioning of guided work platforms.
• Alignment of heavy fabrication fixtures.
• Adjustment of conveyor sections and transfer assemblies.
• Positioning of tooling and machine beds.
• Maintenance arrangements requiring controlled movement.
• Mechanically linked lifting systems with multiple support points.

Suitability depends on the complete system, including its frame, guides, drive components and load distribution.

How to Select the Right Configuration

Check the Load at Each Lifting Point

The total weight does not always divide equally between several jacks. An offset centre of gravity, uneven loading or a flexible platform can place more force on one lifting point. Selection should account for the highest expected load at each jack, including forces caused by starting, stopping or vibration.

Consider Stroke and Unsupported Screw Length

A longer stroke increases the distance over which the screw may be unsupported. Under compression, this affects its resistance to buckling. The nominal capacity should therefore not be treated as the allowable load at every extension.

Specify both the required travel and the maximum extended position so the screw can be checked for the application.

Match Speed to Operating Frequency

A jack used occasionally for height adjustment has different requirements from one that cycles repeatedly throughout a shift. Load, speed and running time influence heat generation and wear.

Provide the required travel time, number of cycles per hour and expected daily operating hours when requesting a quotation.

Keep Side Loads Away from the Screw

External guides should control lateral movement and maintain alignment. The screw jack should not be used to compensate for a misaligned frame or to restrain a load that can tilt freely.

Confirm the Load-Holding Method

Self-locking must be verified for the actual screw and gear configuration. It should not be assumed simply because the unit uses a worm gear. Where the application requires secure load retention, the system design may need a brake, mechanical lock or separate support.

Installation and Maintenance

Mount the jack on a rigid, correctly aligned structure using the approved fixing arrangement. Check that the lifting screw, load connection and guides remain aligned throughout the full travel.

Routine maintenance should follow the supplied instructions and include lubrication, inspection of mounting fasteners, checks for thread wear and examination of protective covers. Unusual noise, rising operating effort or irregular movement should be investigated before further use.

Where maintenance places personnel beneath a raised load, provide suitable independent mechanical support.

Request a Quotation from Jyoti Hydraulic

To enquire about the Worm Gear Screw Jack 20 Ton, share your load details, required stroke, lifting speed, mounting orientation and operating frequency. For a system using several jacks, also provide the platform dimensions, lifting-point positions and load distribution.

These details help establish the required configuration and provide a clear basis for reviewing the quotation and installation drawing.

Frequently Asked Questions

Can this screw jack lift 20 tons at any stroke length?

The 20-ton designation does not establish the allowable load at every extension. Stroke, unsupported screw length, mounting conditions and operating duty must be checked against the model’s technical limits.

Is the screw jack hydraulic?

A worm gear screw jack uses gears and a threaded mechanism to produce movement. The Jyoti Hydraulic brand name does not mean this product operates through a hydraulic cylinder.

Can it be operated with an electric motor?

Motor-driven operation depends on the supplied configuration. Motor selection requires the input torque, speed, load and duty-cycle requirements.

Can several screw jacks lift one platform?

Multiple jacks can be incorporated into an engineered lifting system. The design must address synchronisation, unequal loading, shaft alignment, platform rigidity and overload protection.

Does it hold the load automatically when the drive stops?

Confirm the model’s self-locking behaviour with Jyoti Hydraulic. Depending on the configuration and application, additional braking or mechanical locking may be necessary.

What determines the price?

The quotation depends on the confirmed configuration, including stroke, screw arrangement, drive requirements, mounting details and accessories. Share the application requirements to obtain an appropriate offer.