Screw Jacks
Screw Jacks
Series BD Screw Jacks are mechanical worm gear screw jacks suitable for diverse applications such as food, energy, mining, automotive, aerospace, and marine propulsion. The company offers custom-engineered transmission solutions and repair services for critical transmissions across various industries.
The document details various series of mechanical drive products, including:
- Series X: Cone Ring, Torque Limiter, Grid, Nylicon, and Gear couplings.
- Series J: Shaft mounted helical speed reducers.
- Series C: Right angle drive helical worm geared motors & reducers.
- Series BD: Screwjack worm gear unit.
- Series G: Helical parallel shaft & bevel helical right angle drive gear units.
- Series M: In-line helical geared motors & reducers.
- Series H: Large helical parallel shaft & bevel helical right angle drive units.
- Roloid Gear Pump: Lubrication and fluid transportation pump.
- Series BS: Worm gear unit.
- Series A: Worm Gear units and geared motors in single & double reduction types.
- Series K and F: Right angle helical bevel helical geared motors & reducers.
The products comply with the ATEX Directive 94/9/EC, ensuring safe use in potentially explosive atmospheres. Certification includes CE Mark and Ex mark, mandatory for equipment used in hazardous locations.
The Series BD includes mechanical worm gear screw jacks with trapezoidal lifting screws, available in standard and variant executions. Key specifications include:
- Capacities up to 1000 kN (100 tonne), with higher capacities on request.
- Lifting speeds up to 2.4 m/min, with double speed options available.
- Standard lifting screw lengths up to 4 m, extendable on request.
- Self-locking in non-vibrating conditions, with small side loads accepted on type BD.
The selection guide provides criteria for choosing the appropriate screw jack, including:
- Axial load, environmental conditions, and operating cycle.
- Options for safety nuts, stop nuts, and anti-backlash features.
- Motor specifications and mounting options.
The document provides technical data for BD and BDL types, including:
- Max capacities, lifting screw specifications, and gear ratios.
- Running and starting efficiencies, torque requirements, and power ratings.
Instructions for mounting and maintaining the screw jacks are provided, emphasizing consulting application engineers for specific conditions and requirements.
The document provides detailed technical specifications and dimensions for the BD series of ball screw jacks, including models BDK and BDKL. It covers both versions with and without bellows, and includes information on motor flanges, power ratings, and load capacities.
The BD series includes sizes 27, 40, 58, and 66, with maximum capacities ranging from 8 kN to 125 kN. The lifting screws have different dimensions and ratios, affecting the raise per revolution and starting torque. The allowable working temperature range is from -30°C to +100°C.
Detailed dimensions are provided for each size, including diameters, lengths, and other critical measurements. The document also includes dimensions for versions with bellows and motor flanges, accommodating various motor sizes.
Power ratings are given for different sizes and conditions, with specific notes on running power and efficiency. The document emphasizes the need for additional power at startup and provides guidelines for adjusting power based on intermittence factors.
Compression load tables are provided for different stroke lengths, with safety factors against breaking. The document includes tables for free and guided loads, as well as supported spindle configurations.
The ball screw jacks are constructed with components such as thrust and radial bearings, nodular cast iron housing, and tin bronze worm wheels. They are painted with alkyd paint and filled with EP-quality grease.
The document mentions the availability of single and double trunnion options, as well as compatibility with IEC motors. It also provides examples of combination arrangements with other products for low lifting speeds.
Universal joint shafts are designed to span any distance and compensate for larger radial offset misalignments. The X-G type is torsionally stiff, free from play, and offers bending elasticity with axial and angular flexibility. It is oil-resistant and can withstand temperatures up to 150°C. The selection of shafts is based on torque capacity, permissible angular misalignment, and maximum permissible length, which depends on speed.
The shafts are available in seven sizes, supporting nominal torques from 10 to 550 Nm with a single element, or up to 1100 Nm with two elements in tandem. The permissible torques and speeds vary by size, with maximum speeds ranging from 4500 to 10000 RPM.
Two types of bevel gears are recommended for screw jack arrangements: DZ-Range for smaller loads and lower speeds, and C-Range for larger loads and higher speeds. The DZ-Range features sand-cast aluminum housing and hardened bevel gears, while the C-Range offers high resistance aluminum alloy housing and spiral bevel gears. Both ranges support various mounting positions and have specific lubrication requirements.
Proper lubrication is crucial for the longevity of screw jacks and bevel gears. Different types of grease are recommended based on ambient temperature. Regular maintenance includes checking for wear and ensuring proper alignment during installation. Lubrication intervals vary based on duty conditions, with more frequent lubrication required for arduous duties.
Safety precautions are essential when handling power transmission equipment. Potential hazards include fire/explosion risks from oil mists, the need for guards on rotating parts, and noise levels from high-speed machinery. Proper selection, installation, and maintenance are critical to ensure safe operation.
Personnel should be provided with noise defenders in high noise environments, following the Department of Employment Code of Practice.
Use only designated lifting points or eyebolts for lifting operations to prevent injury or damage. Refer to maintenance manuals for lifting point locations.
Prolonged skin contact with lubricants should be avoided. Follow manufacturer instructions for handling and check lubrication status before commissioning to prevent mechanical damage or injury.
Always observe hazard warnings and isolate power before working on electrical equipment to prevent accidental machinery start-up.
Consult for special preservation requirements if storing equipment for over six months. Rotate gears monthly to prevent bearing damage. Follow manufacturer instructions for installation and ensure qualified personnel perform the tasks. Remove load and isolate power before maintenance.
Gear units may become hot during operation. Avoid contact and allow cooling before servicing.
Ensure backup systems are in place for backstop facilities. Select equipment to avoid critical speeds and vibrations. Do not operate beyond designed parameters.
The document provides contact details for Benzlers and Radicon offices across various countries for further assistance.
Catalog excerpts
Series BD Screw Jacks Technical Up to - 100Te / 5m/min Screw Jacks CBD-2.00GB1211
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PRODUCTS IN THE RANGE Serving an entire spectrum of mechanical drive applications from food, energy, mining and metal; to automotive, aerospace and marine propulsion, we are here to make a positive difference to the supply of drive solutions. Series A Worm Gear units and geared motors in single & double reduction types Series BD Screwjack worm gear unit Series BS Worm gear unit Series C Right angle drive helical worm geared motors & reducers Series F Parallel angle helical bevel helical geared motors & reducers Series G Helical parallel shaft & bevel helical right angle drive gear units Series...
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ATEX Compliance Assured Total compliance with the ATEX Directive safeguarding the use of industrial equipment in potentially explosive atmospheres is assured for users of our geared products. Certification is available for standard gearboxes and geared motors with badging displaying the CE Mark and the Ex mark, name and location of the manufacturer, designation of series or type, serial number, year of manufacture, Ex symbol and equipment group/category. ATEX directive 94/9/EC (also known as ATEX 95 or ATEX 100A) and the CE Marking Directive are enforced in all EC member states. Compliance is...
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SERIES BD CONTENTS Introduction____________________________________________________________________ 3 Standard and variant executions___________________________________________________ 4 Selection guide_________________________________________________________________ 6 Determination of type____________________________________________________________ 7 Selection of jacks_______________________________________________________________ 8 Technical data BD - BDL__________________________________________________________ 9 Power ratings BD - BDL__________________________________________________________...
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SERIES BD INTRODUCTION We are a company in the transmission field with comprehensive experience in manufacturing and marketing MECHANICAL WORM GEAR SCREW JACKS, and complete screw jack systems. Mechanical worm gear ball screw jack, available with translating lifting screw or lifting nut. Capacities up to 125 kN (12.5 tonne). 200 kN (20 tonne) with ball screw available on request. With this catalogue we have made it easy to select a screw jack or screw jack system suitable for your application. You can also consult our Technical Sales and Engineering department. They will help you with computer...
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SERIES BD STANDARD & VARIANT EXECUTIONS Standard Executions BD Screw jack with translating lifting screw BDL Screw jack with lifting nut Fig.2 Fig.3 Screw jack with PVC bellow Screw jack with motorflange SM Stop nut Fig.4 Fig.5 Fig.6 Variant Executions BDK Ball screw jack with translating lifting screw BDKL Ball screw jack with lifting nut Fig.7 Fig.8 4
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SERIES BD VARIANT & SPECIAL EXECUTIONS Variant Executions LR Locked against rotation LRK Locked against rotation with key ABL Antibacklash Fig.9 Fig.10 Fig.11 LS Limit switches SHM Safety nut Double Clevis Ends (with reinforced protection tube) Fig.12 Fig.13 Fig.14 Special Executions Worm gears BS 40-71 as screw jacks BSD / BSDL / BSDKL Screw jack with worm gear motor Fig.15 Fig.16 5
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SERIES BD SELECTION GUIDE SELECTION GUIDE LIFTING SCREW For the application of Worm Gear Screw Jacks Axially travelling screw or nut? (BD/BDL): Name of company: Stroke length (mm): Address: Lifting speed (mm/min): Telephone/Fax: Mounting position of screw (horizontal/upwards/inverted): Contact person: Ballscrew preferred? (yes/no): Describe the intended installation: (a sketch is advisable) Screw end (thread, top plate, clevis): Protection bellow? (yes/no): Protection tube on reverse side? (yes/no): Stainless material: OPTIONS Safety nut SHM, state safety load direction: Number of jacks per installation:...
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SERIES BD DETERMINATION OF TYPE 1. Type BD = 8. Options Screw jack with translating screw Type BDL = Screw jack with travelling nut Type BDK = Ball screw jack with translating screw Type BDKL = Ball screw jack with travelling nut SHM = Safety nut, specify load safety direction SM = Stop nut LR = Locked against rotation LRK = Locked against rotation with key ABL = Antibacklash LS = 2 limit switches including stop nut 2. Size = 27, 40, 58, 66, 86, 100, 125, 200 3. L = Low worm gear ratio with single start lifting screw 9. Stainless steel executions H = High worm gear ratio with single start lifting...
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SERIES BD SELECTION OF JACKS Symbols used: F = Force (N) (1 tonne = 10 000 N) v = Lifting speed (mm/min) s = Pitch of lifting screw (mm) n = Required input speed (rpm) i= Ratio of worm gear set ED = Intermittence factor (%) Pd = Running power of screw jack (kW) Ps = Starting power of screw jack (kW) PED = Thermal power (kW) PMnom = Nominal motor power (kW) PMst = Starting power of motor (kW) PMax = Max allowable input power of screw jack (kW) ηd = Running efficiency of screw jack ηs = Starting efficiency of screw jack 2. By compression load check stroke length for bending according to Euler I,...
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SERIES BD DESCRIPTION OF BD - BDL 1 2 3. 4. 5. 6. 7. 8. 1 3 7 2 Trapezoidal lifting screw Thrust and radial bearings Grease of EP-quality Housing of nodular cast iron Alkyd paint 85 micron thick in RAL 5015 Worm screw hardened and ground Worm wheel of centrifugally cast tin bronze Bellows in PVC, steel or other materials. Mechanical jacks have a allowable working temperature range from -30° C to +100° C. At full load the degree of utilization (ED) must not normally exceed 40% per 10 minutes, still not more than 20% per hour totally, in valid at ambient temperature +25° C. 6 4 For other conditions...
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SERIES BD TECHNICAL DATA Technical Data, Double Start Spindle SIZE 27 Lifting screw 58 66 86 100 125 200 8000 Max capacity N 40 20000 40000 120000 160000 240000 400000 800000 Tr55x18 Tr 65x20 Tr 90x24 Tr120x28 Tr160x32 Tr 20x8 Ratio (L) Tr 30x12 Tr 40x14 9:1 7:1 6.75:1 7:1 7:1 7:1 7.5:1 12:1 0.888 1.714 2.074 2.571 2.857 3.428 3.733 2.667 6 23 55 210 320 640 1280 2120 Max running power at 20% ED (kW) 0.25 0.7 1.1 1.9 3.6 4.7 6.4 16.0 Starting efficiency ηs 0.18 0.23 0.23 0.22 0.22 0.20 0.19 0.16 Ratio (H) 27:1 30:1 27:1 28:1 28:1 28:1 30:1 36:1 Raise per revolution (mm) 0.296 0.400 0.518 0.642...
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