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Screw Jacks

Product catalog summary

Introduction
NIASA N/W/R Series screw jacks are mechanical devices designed for precise, safe, and efficient linear movement, particularly for medium-heavy loads at medium-low speeds. They are available in three configurations (N, W, R) and offer advantages over pneumatic or hydraulic systems, such as greater precision, safety, energy efficiency, and modular design.

Specifications
The screw jacks range supports axial load capacities from 5 kN to 500 kN, with various advance speeds and gear ratios from 4:1 to 56:1. Options include trapezoidal and ball screws, fastening accessories, control and safety systems, and materials suitable for different environmental conditions.

Applications
Applications include manual positioning systems, machine tilting systems, platform elevation systems, tilting elevation systems, and photovoltaic installations, each utilizing different configurations and components to meet specific operational needs.

Screw Jack Sizes
NIASA offers screw jack sizes from M1 to J5, with load capacities up to 500 kN. Each size can be configured with different screw types and gearboxes to suit specific requirements, with custom configurations available upon request.

General Product Overview
The document details components and configurations for N, W, and R series screw jacks, including nuts, flanges, protective bellows, and mounting options. Technical specifications include screw diameter, pitch, maximum axial strength, reduction ratios, and performance metrics.

Technical Document Summary

Specifications:
Detailed specifications include screw diameter and pitch, maximum axial strength, reduction travel, performance, drive torque, start-up torque, and weight. Specifications are tabulated for different models with varying parameters like maximum axial strength (up to 500 kN) and reduction ratios (e.g., 10:1, 40:1).

Procedures:
Instructions for calculating power requirements and ensuring dynamic loads do not exceed critical values to prevent overheating and mechanical failures are provided, with references to specific chapters for detailed calculations and nut dimensions.

Standards and Norms:
The document adheres to DIN standards for greasing mechanisms and key dimensions, ensuring compatibility and reliability in mechanical applications.

Recommendations:
Users are advised to consult the calculation chapter for speeds other than the standard 1,000 or 1,500 rpm and ensure dynamic loads do not surpass critical values to avoid overheating and resonance issues.

Key Data from Tables:
Tables provide critical data such as maximum axial strength ranging from 250 kN to 500 kN, drive torque and start-up torque calculations based on load, and weight specifications for different stroke lengths.

Additional Notes:
Notes indicate that nut dimensions should be referred to in the corresponding chapter, and alternative configurations can be ordered upon request. The importance of specifying the orientation of the nut for certain configurations is highlighted.

System Drive Torque
The torque of a system composed of multiple screw jacks is influenced by the torque required for each individual drive and the efficiency of the connecting transmission parts. A safety coefficient of 1.3 to 1.5 is recommended, or a factor of 2 for smaller installations. For loads less than 10% of the elevator's nominal load, use that value for calculations. Load distribution is assumed to be uniform across all units of the same size.

System Start-up Torque
For loads between 25% and 100% of the screw jack's nominal value, a specific formula is used to calculate start-up torque. For loads below 25%, multiply the system drive torque by 2.

Product Selection
Various screw jack models (MD1/MD2/MD3) are available with different drive torques and gearbox efficiencies. The standard drive uses AC motors, with power options ranging from 0.06 kW to 22 kW. Motors should ideally include a brake to prevent position loss.

Lubrication
Screw jacks are lubricated with DIVINOL LITHOGREASE G421, a semi-synthetic lithium compound grease. A complete grease change is recommended every five years, with lubrication intervals depending on usage. Over-lubrication should be avoided.

Protection Against Corrosion and Environmental Factors
Corrosion protection is based on DIN EN ISO 12944-2 standards. For environments with high corrosion categories or durability requirements, consult NIASA for appropriate surface protection. Standard IP54 protection is provided against solid and liquid ingress, with higher levels available upon request.

Optional Configurations
NIASA offers customization options for screw jacks, including anti-rotating screws, special ends, and worm gear modifications. Special configurations can be requested for specific applications.

Ordering and Accessories
Detailed specifications for ordering include size, configuration, gearbox type, protection level, screw type, and various accessories. Customization options are available for specific needs.

Catalog excerpts

“THERE IS A DRIVING FORCE MORE POWERFUL THAN STEAM, ELECTRICITY AND ATOMIC ENERGY: THE WILL.” ALBERT EINSTEIN Physicist Niasa actuators in the Tonopah thermo-solar plant, Nevada, USA.

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SCREW JACKS introduction NIASA N/W/R Series screw jacks are a combination of a screw with a gearbox. There are three types of configurations that can be adapted to different requirements: …… N: The screw moves when the gearbox input shaft (worm shaft end) is activated. It includes a rounded screw protection tube on the back. …… W: The screw engages, as in configuration N but with the difference that the back protective tube is square section, which means it can be an anti-rotating screw. …… R: The screw does not move with the driving of the worm shaft, it only turns; it is the corresponding nut...

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SCREW JACKS APPLICATIONS Machine TILTING system Set of two M4-N screw jacks made up of a three-phase motor drive system and joined together with a GX universal joint shaft. Tilt on the top of the gearbox with a ZKM joint adapter, SB tip supports, GKB series double clevis rod, FB protective bellow, inductive sensor and electro-magnetic brake. Manual positioning system. 22 Set of three M2-N screw jacks made up of a manual drive system with a VE series wheel and joined together with GX universal joint shafts. LCM-series mounting feet underneath the box, GKB series double clevis rod, manual brake...

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Photovoltaic installation M5-W screw jack with IPX protection for outdoor weather made up of a three-phase motor drive system, tilt underneath the gearbox with a ZKM joint adapter, clevis rod with GIR series ball joint on the screw, EPDM special protection bellow and inductive sensor. Platform elevation system. Set of four M5-N screw jacks made up of a three-phase motor drive system and joined together with EZ universal joint shafts and bevel gearboxes. LCM-series mounting feet underneath the box, BPS flange fastening on the screw, FB series protective bellow and PR series worm shaft protector....

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SCREW JACKS On all the sizes there are trapezoidal and screw drive options (see chapter 07 for further information), as well as normal speed (S) and reduced speed (H) gearboxes. The screw moves. page 28 page 30 page 32 page 34 screw. page 28 page 30 page 32 page 34 The nut moves. page 29 page 31 page 33 page 35 In addition to the standard range of screw jacks, NIASA can specifically develop the unit that best meets your application requirements. Contact NIASA.

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SCREW JACKS GENERAL PRODUCT OVERVIEW 11 17 Flange with ZKV 90º bolts 19 FCM mechanical limit switch 20 FCI inductive limit switch 07 Wheel with VE grip 15 Flange with ZKM bolts 08 PR worm gear protector 16 Flanges with ZKH bearings

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18 Flange with ZKM bolts 11 Flange with BPR bearing 19 Flanges with ZKH bearings 20 Flange with ZKV 90º bolts 22 Flange with KAR bolts 07 Wheel with VE grip 08 PR worm gear protector

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The screw sizes indicated correspond to the basic configurations. Other configurations may be ordered (size, type, etc.) on request. Ø30 (Ø48) M5x8 Prof. On both sides Greasing mechanism Screw diameter and pitch (mm) Maximum axial strength (kN) M8x13 Prof. On both sides NOTES: - The values in brackets correspond to the versions with KG screw. * Version W. Travel (mm/revol. input) F (kN), load to move in dynamic Approx. weight each 100mm of stroke (kg) … Power required: PD (kW) = 0.157 x MD (Nm). … All the data in the table correspond to an input speed of 1,500 rpm. For other speeds, please see...

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The screw sizes indicated correspond to the basic configurations. Other configurations may be ordered (size, type, etc.) on request. Ø12j6 15 Greasing mechanism DIN71412 Inclined 45° MT508 = M5x8 Prof. On both sides Screw diameter and pitch (mm) Maximum axial strength (kN M8x13 Prof. On both sides Travel (mm/revol. input) F (kN), load to move in dynamic Approx. weight each 100mm of stroke (kg) … Power required: PD (kW) = 0.157x MD (Nm). … All the data in the table correspond to an input speed of 1,500 rpm. For other speeds, please see the calculation chapter (page 47). ... Ensure that the dynamic...

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The screw sizes indicated correspond to the basic configurations. Other configurations may be ordered (size, type, etc.) on request. M6x9 Prof. On both sides Screw diameter and pitch (mm) NOTES: - The values in brackets correspond to the versions with KG screw. * Version W. Maximum axial strength (kN) M8x15 Prof. On both sides Travel (mm/revol. input) F (kN), load to move in dynamic Approx. weight each 100mm of stroke (kg) … Power required: PD (kW) = 0.157x MD (Nm). … All the data in the table correspond to an input speed of 1,500 rpm. For other speeds, please see the calculation chapter (page...

Open the catalog to page 15

The screw sizes indicated correspond to the basic configurations. Other configurations may be ordered (size, type, etc.) on request. Ø15j6 Greasing mechanism DIN71412 Inclined 45° MT508 = M6x9 Prof. On both sides Screw diameter and pitch (mm) Maximum axial strength (kN) Travel (mm/revol. input) F (kN), load to move in dynamic Approx. weight each 100mm of stroke (kg) … Power required: PD (kW) = 0.157x MD (Nm). … All the data in the table correspond to an input speed of 1,500 rpm. For other speeds, please see the calculation chapter (page 47). ... Ensure that the dynamic load of the application...

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The screw sizes indicated correspond to the basic configurations. Other configurations may be ordered (size, type, etc.) on request. M8x10 Prof. On both sides Greasing mechanism DIN71412 Screw diameter and pitch (mm) Maximum axial strength (kN) M10x14 Prof. On both sides Travel (mm/revol. input) F (kN), load to move in dynamic Approx. weight each 100mm of stroke (kg) … Power required: PD (kW) = 0.157x MD (Nm). … All the data in the table correspond to an input speed of 1,500 rpm. For other speeds, please see the calculation chapter (page 48). ... Ensure that the dynamic load of the application...

Open the catalog to page 17

Screw Jacks

Screw Jacks

Catalog excerpts

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