FeaturesBest mini hand crank screw jacks, Manual Worm Gear Screw Jack for Crank TableThe longer the stroke, the less load it can lift, considering the compression limit of the screw. It can powered by motor, belt or handwheel. Can be mounted uprightly, horizontally or inverted for different applications with different screw end. It is stable, accurate and space saving.
A manual screw jack is consist of a hand wheel and a complete worm gear screw jack. The screw jack makes it possible to transform the rotary motion provided by a handwheel, into linear motion that allows push or pull vertical lifting and horizontal positioning. They can be used to lift, pull, move, or align any type of load with perfect synchronism, which is difficult to achieve with other types of actuators.They can be applied either with vertical mountings facingup or down, or with horizontal mountings.
All screw jacks can be moved manually via a handwheel. To do this, 1 input shaft shall be available on the screw jack for the connection of the handwheel. Manual screw jacks are available in load capacity 0.25 ton, 0.5 ton, 1 ton, 2 ton, 2.5 ton, 3 ton, 5 ton, 10 ton, 15 ton and 20 ton, heavy load larger than 20 ton capacity, manual operated screw jack is not recommended. They are ideal solutions for applications where electricity or power generators is inconvenient or dangerous, or in case of power failure, light weight, low duty cycle, low speed, low target cost, short stroke, and intermittent positioning applications. If must be not backdriving, a self locking machine screw jack with handwheel is the best choice. If high speed ball screw jack with handwheel, locking mechanisms need to be considered. If a brake motor is used, the brake shall be un-clamped firstly, so to allow for movement.

Cast Iron Handwheel Diameter 125mm, 160mm, 200mm, 250mm, 300mm and 400mm, larger diameter handwheel is available, please consult CZPT Industry. The recommended screw jack with 0.25 ton, 0.5 ton, 1 ton, 2 ton, 2.5 ton, 5 ton, 10 ton, 15 ton, 20 ton capacities are available in matching cast iron handwheel for hand-operation application.

Aluminum Handwheel with Folding Handle Diameter 125mm, 160mm and 200mm. The recommend screw jack 0.25 ton, 0.5 ton, 1 ton, 2 ton, 2.5 ton, 5 ton capacities are available in matching aluminum handwheel for hand-operation application.

In order to precise position display of the travel length, the worm shaft adds a digital position indicator which measures the rotation and display a corresponding position in a counter window. There are 3 sizes position indicators: 04 series position indicator 4 numbers with 14mm hollow shaft, 09 series position indicator 5 numbers with 20mm hollow shaft, 10 series position indicator 5 numbers with 25mm or 30mm hollow shaft. Note: inapplicable motorized screw jacks.

Miniature Hand Wheel Manual Screw Jack with Clevis End, or Top Plate End
Mini compact CZPT screw jack 2.5 KN capacity, translating screw configuration, upright mount, gear ratios 1/5 (one rpm input travel length 0.8 mm), 14mm diameter lifting screw and 4mm screw leads(pitch) as standard, stroke 65mm, clevis end, or top plate, 2 input shafts, attached handwheels 125mm diameter.
Hand Operated Screw Jack 50 kN
Cubic manual screw jacks load capacity 50 kN, self locking trapezoidal screw diameter 40mm, pitch 7mm, upright mount, translating screw type, stroke 500mm, ratio 7:1 (one rpm input travel length 1mm), threads end attaches rod end bearing, double input shafts, attached protect pipe, and hand wheels diameter 300 mm.

5 ton stainless steel hand crank screw jack for lifting tables. Stainless steel worm gear screw jack 5 ton capacity, translating screw configuration, inverted mount, gear ratios 1/12 (one rpm input travel length 0.59 mm), 40mm diameter lifting screw and 7mm screw leads(pitch) as standard, stroke 1200mm, clevis end fitting, right input shaft and left motor flange, attached handwheel 200mm dia., and electric motor with motor flange.

Manual Operated Worm Gear Jack Screw 5tonnes

Hand Worm Screw Lift Jacks 2.5 tonnes

Manual Screw Jack 5 ton
Crank screw jacks with 5 ton capacity, anti-rotation keyed screw configuration, GJF axle shaft drive shafts for CZPT Fiesta AT spare parts 2013- C-FD073-8H upright mount, gear ratios 1/7 (one rpm input travel length 1 mm), 40mm diameter lifting screw and 7mm screw leads(pitch) as standard, stroke 350mm, thread end screwed into rod end(set screws fix), right shaft and left shaft, attached handwheels 300mm diameter, rod end bearings, protective pipe and digital counters.

2.5 ton hand operated screw jack lift for industrial vintage cast iron crank dining crank table base. Hand wheel screw jack with 2.5 ton capacity, upright installation, translating screw configuration, gear ratios 1/6 (one rpm input travel length 2 mm), 30mm diameter CZPT screw and 12mm(2P) screw leads(pitch) as standard, stroke 300mm(12″), top plate(flange) end fittings, 2 input shafts, attached handwheel 200mm(8″) or 300mm(12″) diameter, couplings and drive shafts.

2.5ton Stainless Steel Manual Operate Screw Jack with Traveling Nut for Hand Crank Lift Systems. Stainless Steel Machine Screw Jack 2.5 ton capacity, rotating screw configuration, upright mount, gear ratios 1/6 (one rpm input travel length 1 mm), 30mm diameter lifting screw and 6mm screw leads(pitch) as standard, stroke 500mm, plain end fitting, 2 input shafts, attached handwheels 200mm dia., and copper travel nut.

10 ton hand wheel worm gear screw jack for screw jacks platform lift. Hand-operated machine screw jack (or linear actuator) type device 10 tons capacity, upright installation, translating screw configuration, gear ratios 1/8 (one rpm input travel length 1.5 mm), 58mm diameter machine screw and 12mm screw leads(pitch) as standard, stroke 500mm, top plate(flange) end fitting, 2 input shafts, attached handwheels 300mm(12″) diameter.

5ton hand operated lifting screw jacks for mechanical hand crank lift table. Manual machine screw jack 5 tons capacity, translating screw configuration, upright mount, gear ratios 1/6 (one rpm input travel length 1.167 mm), 40mm diameter lifting screw and 7mm screw leads(pitch) as standard, stroke 150mm, clevis end fitting, 2 input shafts, attached handwheels 300mm(12″) diameter, protect tube and bellows boots.

1 Ton Manual Worm Gear Screw Jack for Llifting

Mechanical screw jacks can be operated by manually or by electrical motor. More than 1 screw jacks can be connected together to move simultaneously.Mechanical Lifting and Pulling Screw Jacks These models are used instead of hydraulic jacks where pushing and pulling is neeed between heavy components espacially in industrial building construction works, industrial machinery installations, bridge constructions.Working principle of screw jacksTravelling Screw Type: Main components of screw jacks are; trapezoidal lifting screw, worm screw, worm gear and gear housing. Worm screw is rotated manually or by motor. Worm gear is rotated by worm screw. The lifting screw moves through the rotating worm gear. If free load connected to screw jack, screw will rotate circularly and move up ande down. If it is constantly load, screw will move vertical ways linearly. The linear motion speed of lifting screw depends on thread size and rotation ratio of worm gears.Anti-rotation Keyed Screw Type: Main components of screw jacks are; trapezoidal lifting screw, worm screw, worm gear and gear housing. Worm screw is rotated manually or by motor. Worm gear is rotated by worm screw. The lifting screw moves through the rotating worm gear. In order to prevent/block screw’s rotation, wedge should be opened to screw. By this way, the screw can just move vertically. Screw connection type’s importance will be put away. The linear motion speed of lifting screw depends on thread size and rotation ratio of worm gears.Travelling Nut Type: Main components of screw jacks are; trapezoidal lifting screw, worm screw, lifting nut and gear housing. Worm screw is rotated manually or by motor. With the rotation of the gear, the screw that is inside the screw jack only makes its rotation about its axis. The flange, which is produced from the bronze material on the screw shaft moves linearly upwards or downwards. One of the purposes of using such systems is the lack of ducting or storage for the movement of the screw used in the screw type and screw type cockp. Although screw jack doesn’t lift down from bottom. The linear motion speed of lifting screw depends on thread size and rotation ratio of worm gears.
Manual screw jack (hand wheel screw jacks, hand crank screw jacks, hand operated screw jacks) is driven by a hand wheel or crank or handle. The best advantage is suitable for heavy load, low speed, low service frequency. Our manual screw jacks have different configuration form and assembly type,and the lifting height can highly customized according to users’ demand, low cost and easy operation.
Our standard jacks use Trapezoidal screw and have self-locking function which is very safe for manually operated by hand. We have different models for your selection, our jtw series machine screw jack is the most cost-effective selection for this application. You can also use digital position indicators if you need more precise position display. It can measure the rotations of the input shaft and display the corresponding position in the digital counter window. The display value per input shaft revolution is variable and is achieved through a series of gear reductions configured to accommodate different worm gear screw jack ratios, screw pitch, and travel length.
Packaging & ShippingShipping:1. CZPT freight: seaport to seaport, price terms CIF, FOB, EXW, CFR etc.2. Air freight: airport to airport, price terms EXW, CRF etc.3. Air courier: DHL, FEDEX, UPS, Car Front Drive Shaft for CZPT Ncp9# Vios Yaris1.3R 08- NSP151 ZSP9192 C-TO073-8H TNT door to door shipment, price terms DDU, CPT etc.Packing: 100% standard exporting plywood cases.
Note: International Exporting Standard Wooden Material with Free Fumigation.

Our Advantages* One of the biggest orders with 1750 units screw jacks.* Standard products with 2D Drawings(DXF, DWG, PDF) and 3D CAD Model(STEP).* 100% quality assured with double quality inspections. Original Inspection Reports, Operation Manual, and Book Catalogue are put into the packages. * 100% safety transportation with strong standard export plywood cases materials (free fumigation). * International standard materials for all standard products. * Custom design available, OEM service available, Free engineering advice and Customer label available.

Finished Projects1. Theatrical solutions stage and orchestra platform lifts projects. Customers are from France, Australia, Netherlands, United Kingdom, Spain and Canada. 2. Hydroelectric power station projects and water conservancy projects. Customers are from Vietnam, Australia, Malaysia, Belgium, United States and United Kingdom. 3. Aircraft maintenance platforms and docking systems projects. Customers are from Singapore. 4. Solar panel tracking system projects. Customers are from Spain, India and Canada. 5. Bolted steel storage tanks and silos lifting solutions. Customers are from South Africa, United States, Mexico and Vietnam. 6. Dish antenna elevation and azimuth positioning projects. Customers are from Singapore, Malaysia and United States. 7. Railway wagon projects. Customers are from South Africa. 8. Beverage can production lines. Customers are from Netherlands, United States, Thailand and Indonesia. 9. Steel factories production lines. Customers are from United States. 10. Continuous PU sandwich panel production lines. Customers are from Thailand and United Kingdom.
Other Products* Manual Screw Jacks.* Electric Screw Jacks.* Worm Gear Screw Jacks Series.* Bevel Gear Screw Jack Series.* Electric Cylinders Series.* Spiral Bevel Gearboxes Series.* Lifting Systems and Accessories.* Electric Linear Actuators Series.* Geared Motor and Gear Reducers Series.

Clients Countries1. American Countries: United States, Mexico, Canada, Chile.2. European Countries: Germany, France, United Kingdom, Italy, Spain, Poland, Romania, Netherlands, Belgium, Greece, Czech Republic, Portugal, Sweden, Hungary, Austria, Switzerland, Bulgaria, Denmark, Finland, Slovakia, Norway, Ireland, Georgia, Slovenia.3. Asian Countries: Malaysia, Indonesia, Singapore, Philippines, Vietnam, Thailand, India, Israel.4. Oceanian Countries: Australia, New Zealand.5. African Countries: South Africa, Egypt.

Contact InformationJACTON INDUSTRY Co., Ltd (VAT No.: 9144190007026567X3) is 1 of the leading companies in the field of Screw Jacks(Mechanical Actuators), Bevel Gearboxes, Lifting Systems, Linear Actuators, Gearmotors and Speed Reducers. We are an audited professional manufacturer and supplier by SGS (Serial NO.: QIP-ASI192186) and BV (Serial NO.: MIC-ASR257162) organizations. We have a strict quality system, with senior engineers, experienced skilled workers and practiced sales teams, and consistently provide the customers with the best engineered solution for precision linear actuation, power transmission and mechanical jacking systems. CZPT Industry guarantees quality, reliability, performance and value for today′s demanding industrial applications.

FAQ
1. What type of payment methods do you accept?
We accept Wire transfer, Credit Card, Paypal, Alibaba Trade Assurance order, Western Union and L/C etc.
2. Can I get 1 sample to test?
Yes, sample can be at a normal price and welcomed. The transport fees are at your account.
3. How about the quality of your product?
Jacton industry is only focus on the field of Screw Jacks(Mechanical Actuators), Bevel Gearboxes, Lifting Systems, Linear Actuators, Gearmotors and Speed Reducers. 4. OEM/ODM Accepted?
Yes, Please send you new product drawings or sample to us if you have, and we can custom-made as your required. We will also provide professional advices of the products to make the design to be maximize the performance.
5. If you can not find the product on our website,how do you do?
Please send us inquiry with product pictures and drawings by email or other ways you prefer, we’ll check if we could produce.
6. Can I trust you?
Absolutely yes. Samples could be provided to test firstly, and we can use Alibaba trade assurance service to do business to guarantee both the seller and buyer’s benefit, and we are golden supplier for years.
7. What’s our products warranty?One year quality guarantee for the products from your purchase date, planetary reduction gearbox manufacture for concrete mixer except the human damage.

Worm Gear Motors

Worm gear motors are often preferred for quieter operation because of the smooth sliding motion of the worm shaft. Unlike gear motors with teeth, which may click as the worm turns, worm gear motors can be installed in a quiet area. In this article, we will talk about the CZPT whirling process and the various types of worms available. We’ll also discuss the benefits of worm gear motors and worm wheel.

worm gear

In the case of a worm gear, the axial pitch of the ring pinion of the corresponding revolving worm is equal to the circular pitch of the mating revolving pinion of the worm gear. A worm with one start is known as a worm with a lead. This leads to a smaller worm wheel. Worms can work in tight spaces because of their small profile.
Generally, a worm gear has high efficiency, but there are a few disadvantages. Worm gears are not recommended for high-heat applications because of their high level of rubbing. A full-fluid lubricant film and the low wear level of the gear reduce friction and wear. Worm gears also have a lower wear rate than a standard gear. The worm shaft and worm gear is also more efficient than a standard gear.
The worm gear shaft is cradled within a self-aligning bearing block that is attached to the gearbox casing. The eccentric housing has radial bearings on both ends, enabling it to engage with the worm gear wheel. The drive is transferred to the worm gear shaft through bevel gears 13A, one fixed at the ends of the worm gear shaft and the other in the center of the cross-shaft.

worm wheel

In a worm gearbox, the pinion or worm gear is centered between a geared cylinder and a worm shaft. The worm gear shaft is supported at either end by a radial thrust bearing. A gearbox’s cross-shaft is fixed to a suitable drive means and pivotally attached to the worm wheel. The input drive is transferred to the worm gear shaft 10 through bevel gears 13A, one of which is fixed to the end of the worm gear shaft and the other at the centre of the cross-shaft.
Worms and worm wheels are available in several materials. The worm wheel is made of bronze alloy, aluminum, or steel. Aluminum bronze worm wheels are a good choice for high-speed applications. Cast iron worm wheels are cheap and suitable for light loads. MC nylon worm wheels are highly wear-resistant and machinable. Aluminum bronze worm wheels are available and are good for applications with severe wear conditions.
When designing a worm wheel, it is vital to determine the correct lubricant for the worm shaft and a corresponding worm wheel. A suitable lubricant should have a kinematic viscosity of 300 mm2/s and be used for worm wheel sleeve bearings. The worm wheel and worm shaft should be properly lubricated to ensure their longevity.

Multi-start worms

A multi-start worm gear screw jack combines the benefits of multiple starts with linear output speeds. The multi-start worm shaft reduces the effects of single start worms and large ratio gears. Both types of worm gears have a reversible worm that can be reversed or stopped by hand, depending on the application. The worm gear’s self-locking ability depends on the lead angle, pressure angle, and friction coefficient.
A single-start worm has a single thread running the length of its shaft. The worm advances one tooth per revolution. A multi-start worm has multiple threads in each of its threads. The gear reduction on a multi-start worm is equal to the number of teeth on the gear minus the number of starts on the worm shaft. In general, a multi-start worm has two or three threads.
Worm gears can be quieter than other types of gears because the worm shaft glides rather than clicking. This makes them an excellent choice for applications where noise is a concern. Worm gears can be made of softer material, making them more noise-tolerant. In addition, they can withstand shock loads. Compared to gears with toothed teeth, worm gears have a lower noise and vibration rate.

CZPT whirling process

The CZPT whirling process for worm shafts raises the bar for precision gear machining in small to medium production volumes. The CZPT whirling process reduces thread rolling, increases worm quality, and offers reduced cycle times. The CZPT LWN-90 whirling machine features a steel bed, programmable force tailstock, and five-axis interpolation for increased accuracy and quality.
Its 4,000-rpm, 5-kW whirling spindle produces worms and various types of screws. Its outer diameters are up to 2.5 inches, while its length is up to 20 inches. Its dry-cutting process uses a vortex tube to deliver chilled compressed air to the cutting point. Oil is also added to the mixture. The worm shafts produced are free of undercuts, reducing the amount of machining required.
Induction hardening is a process that takes advantage of the whirling process. The induction hardening process utilizes alternating current (AC) to cause eddy currents in metallic objects. The higher the frequency, the higher the surface temperature. The electrical frequency is monitored through sensors to prevent overheating. Induction heating is programmable so that only certain parts of the worm shaft will harden.

Common tangent at an arbitrary point on both surfaces of the worm wheel

A worm gear consists of two helical segments with a helix angle equal to 90 degrees. This shape allows the worm to rotate with more than one tooth per rotation. A worm’s helix angle is usually close to 90 degrees and the body length is fairly long in the axial direction. A worm gear with a lead angle g has similar properties as a screw gear with a helix angle of 90 degrees.
The axial cross section of a worm gear is not conventionally trapezoidal. Instead, the linear part of the oblique side is replaced by cycloid curves. These curves have a common tangent near the pitch line. The worm wheel is then formed by gear cutting, resulting in a gear with two meshing surfaces. This worm gear can rotate at high speeds and still operate quietly.
A worm wheel with a cycloid pitch is a more efficient worm gear. It reduces friction between the worm and the gear, resulting in greater durability, improved operating efficiency, and reduced noise. This pitch line also helps the worm wheel engage more evenly and smoothly. Moreover, it prevents interference with their appearance. It also makes worm wheel and gear engagement smoother.

Calculation of worm shaft deflection

There are several methods for calculating worm shaft deflection, and each method has its own set of disadvantages. These commonly used methods provide good approximations but are inadequate for determining the actual worm shaft deflection. For example, these methods do not account for the geometric modifications to the worm, such as its helical winding of teeth. Furthermore, they overestimate the stiffening effect of the gearing. Hence, efficient thin worm shaft designs require other approaches.
Fortunately, several methods exist to determine the maximum worm shaft deflection. These methods use the finite element method, and include boundary conditions and parameter calculations. Here, we look at a couple of methods. The first method, DIN 3996, calculates the maximum worm shaft deflection based on the test results, while the second one, AGMA 6022, uses the root diameter of the worm as the equivalent bending diameter.
The second method focuses on the basic parameters of worm gearing. We’ll take a closer look at each. We’ll examine worm gearing teeth and the geometric factors that influence them. Commonly, the range of worm gearing teeth is one to four, but it can be as large as twelve. Choosing the teeth should depend on optimization requirements, including efficiency and weight. For example, if a worm gearing needs to be smaller than the previous model, then a small number of teeth will suffice.