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Views: 0 Author: Site Editor Publish Time: 2026-09-28 Origin: Site
Choosing a screw jack by tonnage alone can cause serious sizing problems.
An SWL Worm Gear Screw Jack must match load, stroke, lifting speed, screw stability, and drive method. These factors also affect motor size, duty cycle, and service life.
This guide explains how to select the right SWL configuration.
Correct SWL Worm Gear Screw Jack selection starts with the machine load.
Do not begin by choosing SWL5, SWL20, or SWL50. First define how much weight must move and how far it must travel.
Determine the maximum load carried by each jack.
Separate normal working load from short shock loads.
Also identify the load direction.
A screw jack may work in compression, tension, or both.
Compression loads require special attention because long screws can buckle.
For a multi-jack platform, do not simply divide the total weight equally. The load may shift because of an uneven center of gravity.
Machine frames can also deflect during lifting.
If four jacks carry a platform, each unit should be sized for realistic load distribution rather than exactly 25% of total weight.
Compare the calculated working load against the manufacturer's rated capacity.
The supplied reference products show that SWL ranges can cover very different load levels. One supplier lists model-specific lifting forces from 10 kN upward, while another lists SWL2.5 through SWL120 with different capacities.
These values are supplier-specific.
They should not become universal SWL ratings.
HUAKE currently lists SWL2.5, SWL5, SWL10, SWL15, SWL20, SWL25, SWL35, SWL50, and SWL100 models. Its product page also states that lifting height and structural configuration can be customized.
HUAKE SWL Screw Jack product page
Tip： Always size each jack for the highest realistic load it may carry.
Stroke is the actual linear travel required by the machine.
For example, a lifting table may need 300 mm of vertical movement.
Do not automatically order a 500 mm stroke for extra margin.
Longer screws affect more than installation height.
They can reduce stability under compression.
They can also increase deflection and critical-speed concerns.
HUAKE states that SWL lifting height can be customized for the application.
Before defining the stroke, confirm:
Required working travel
Fully retracted position
Fully extended position
Available installation space
Required end clearance
Screw support arrangement
A screw can fail by buckling before reaching the jack's nominal load rating.
This risk increases as unsupported screw length grows.
The problem is especially important under compression.
You should evaluate:
Screw diameter
Unsupported length
Compression load
End support
Stroke
Mounting arrangement
The supplied engineering outline highlights column-strength verification as an essential check for long compression-loaded screws.
A longer stroke may therefore require a larger screw jack.
This can be necessary even when the working load stays unchanged.
Next, define how fast the load should move.
Express the requirement in millimeters per minute.
The correct SWL screw jack lifting speed depends on screw lead, worm ratio, and input speed.
Higher speed is not always better.
It can increase motor power demand.
It also increases friction and heat.
Choose the speed needed by the process rather than the highest available value.
An SWL screw jack may be driven manually or electrically.
HUAKE states that its SWL range supports electric motor drive and manual operation. The units may work independently or as part of combined systems.
For occasional adjustment, a handwheel may be enough.
For repeated automatic operation, an electric motor normally makes more sense.
A multi-jack platform may require several jacks driven from one motor through shafts and couplings.
We will compare these options in detail below.
Finally, confirm the real operating conditions.
Record:
Cycles per hour
Operating time per cycle
Daily operating hours
Mounting position
Ambient temperature
Dust and moisture
Lubrication access
Screw and worm contact create friction.
Frequent operation can therefore cause significant heat.
Tip： Rated lifting capacity alone does not confirm acceptable continuous-duty performance.
The selected jack needs enough capacity for both normal and abnormal operating conditions.
Working load is the actual force seen during normal operation.
Rated load is the manufacturer's permitted capacity under defined conditions.
Do not treat them as identical.
Your selection should account for dynamic effects and load imbalance.
The final safety factor should follow the equipment design requirements.
Compression pushes the screw inward.
Tension pulls it outward.
Long compression-loaded screws are more sensitive to instability.
Tension loads do not create the same column-buckling problem.
However, mounting points still require proper verification.
Use separate lifting and pulling ratings where the manufacturer provides them.
Stroke and load must be evaluated together.
A screw that safely supports a short stroke may become unsuitable at a much longer extension.
This is why SWL screw jack load capacity cannot be selected independently from travel length.
Multiple screw jacks can lift one large platform.
However, equal load sharing is not guaranteed.
Consider:
Center-of-gravity offset
Platform stiffness
Manufacturing tolerances
Shaft synchronization
Installation alignment
A conservative load distribution should be used during initial sizing.
Stroke should match the machine movement without creating unnecessary screw length.
Working travel is only one part of the screw length.
The system also needs space for mounting and internal engagement.
Check the fully retracted and extended dimensions.
This is especially important in compact machines.
Longer screws become more flexible.
They may deflect more easily.
Compression stability also decreases as unsupported length grows.
This means an SWL jack with adequate nominal tonnage may still need to move up one size.
Very long screws may need additional support.
Horizontal installations deserve extra attention because gravity creates bending.
End support can improve screw stability.
It can also increase the allowable operating speed.
A long rotating screw can begin to whip or vibrate.
This condition is often called screw whirling.
Critical speed depends on length, screw diameter, and end support.
It matters most for rotating-screw designs running at higher rpm.
Tip： For long strokes, ask the supplier to verify both buckling load and critical speed.
The best SWL screw jack drive method depends on operating frequency and system layout.
Manual operation works well for occasional adjustments.
Common examples include machine setup and maintenance positioning.
The operator supplies input torque through a handwheel.
Check the required handle force before approving this option.
Heavy loads may make manual operation impractical.
An electric drive suits repeated or automated motion.
It provides consistent speed and reduces operator effort.
Motor selection should consider:
Required input torque
Input rpm
Starting torque
Lifting speed
Number of jacks
Duty cycle
HUAKE's SWL products support both manual and electric operation.
HUAKE Heavy-Duty SWL Worm Screw Jack
Large platforms often use two or four screw jacks.
They can be linked mechanically.
A typical system may include:
One electric motor
Drive shafts
Flexible couplings
Bevel gearboxes
Multiple screw jacks
The mechanical connection helps each jack move at the same rate.
Long drive shafts also require torque and critical-speed checks.
Two basic arrangements are common.
In a translating screw system, the screw moves axially.
In a rotating screw design, the screw rotates while the nut moves.
The correct choice depends on available space and machine structure.
A traveling-nut design can be useful where long travel must fit within limited installation space.
These three parameters should be evaluated together.
Start with process requirements.
How many millimeters should the load move each minute?
A setup mechanism may move slowly.
An automated production machine may need faster motion.
Do not specify more speed than the process requires.
The worm gear ratio affects screw travel for each input revolution.
A slower configuration often provides higher mechanical advantage.
A faster configuration moves the load more quickly.
The supplied SWL selection information distinguishes different transmission ratios and screw movement per worm revolution.
Larger loads require more input torque.
Faster lifting also increases power demand.
Motor sizing should include mechanical losses and startup conditions.
Do not select the motor from lifting capacity alone.
Repeated movement generates heat.
This can limit how often the screw jack operates.
A jack suitable for occasional positioning may not suit continuous lifting.
If the system cycles frequently, thermal performance should be checked during selection.
Mechanical layout often decides which structural form works best.
The screw moves through the jack housing.
It is simple and widely used.
The machine must provide enough clearance for screw movement.
The screw stays in a fixed axial position.
It rotates while the traveling nut moves.
This arrangement can reduce space problems in long-stroke systems.
A translating screw may try to rotate under load.
The machine structure often needs to prevent this rotation.
The supplied reference material also identifies anti-rotation as an important design requirement for certain SWL configurations.
Check corrosion and contamination risks.
Moisture, chemicals, outdoor exposure, or washdown environments may require additional protection.
Material and surface-treatment requirements should be specified during the RFQ.
This ignores stroke, buckling, speed, and duty.
A jack rated for the load may still be unsuitable.
Long travel increases unsupported screw length.
Always check compression buckling.
Adequate lifting capacity does not guarantee an adequate motor.
The complete drive system needs enough input torque.
Frequent operation increases heat.
This can reduce allowable performance.
Some worm screw jacks may resist backdriving.
This characteristic depends on the actual design and operating conditions.
Never rely on assumed self-locking for personnel safety.
A separate certified brake may still be required.
A complete RFQ allows much more accurate selection.
| Category | Information to Provide |
|---|---|
| Load | Total load and load per jack |
| Load direction | Compression, tension, or both |
| Shock load | Maximum temporary load |
| Stroke | Required linear travel |
| Speed | Required mm/min |
| Quantity | Number of screw jacks |
| Drive | Manual or electric |
| Motor | Power and rpm if already selected |
| Configuration | Translating screw or traveling nut |
| Duty | Cycles per hour and operating time |
| Mounting | Orientation and screw support |
| Environment | Temperature, dust, moisture, corrosion |
HUAKE currently offers a wider range of industrial reducers and screw-jack products in its main product catalogue.
HUAKE gearbox and screw jack product range
For lighter applications, the company also provides an SWL2.5 product page.
Higher-capacity projects can reference the SWL100 configuration.
HUAKE states that its SWL series supports customized lifting height and multiple structural configurations.
Choosing the right SWL Worm Gear Screw Jack requires checking load, stroke, screw stability, lifting speed, drive method, and duty cycle. Proper selection improves lifting reliability and reduces buckling or overheating risks.
HUAKE Gearbox provides SWL screw jacks for industrial lifting systems. Its products support multiple load ranges, customized strokes, manual or electric drive, and synchronized multi-jack applications.
A: An SWL Worm Gear Screw Jack lifts, lowers, or positions industrial loads through worm gearing.
A: Select an SWL Worm Gear Screw Jack by working load, peak load, and load direction.
A: Longer SWL Worm Gear Screw Jack stroke increases buckling and stability concerns.
A: Manual drive suits occasional use, while electric drive supports repeated operation.
A: Gear ratio, screw lead, motor speed, load, and duty cycle affect lifting speed.
A: High load, frequent cycles, fast travel, or poor lubrication can increase heat.
