ROSTA oscillating mountings type AB are maintenance-free elastic rockers for the support or suspension of freely oscillating vibrating equipment with a wide variety of designs and drive systems. They assist the driving forces in the conveying direction and assure good linear guidance of the oscillating part of the machine. The pantograph structure of the oscillating mounting allows large spring deflection under load, which results in low natural frequencies (down to approx. 2.2 Hz) and hence exceptionally high insulation efficiency towards the support structure. The great lateral stability of ROSTA oscillating mountings prevents the wobbling of the screen casing typical of helical spring mountings on passing through the resonant frequency.
ROSTA AB50 TWIN and 50-2 TWIN offer very high loading capacities as a result of the special twin construction of the parallel rubber suspension units arranged on each side of the support arms. The loading values are doubled compared to the versions AB 50 and AB 50-2.
The TWIN versions are eminently suitable for mounting large-scale screen plant and screens including counter-oscillating frames, where the overall weight of the machine is ten or more tones. The TWIN versions, owing to the identical guide geometry and natural frequency, may also be combined with the standard AB 50/50-2, and installed at the feed or discharge ends of the screen, depending on the supported weight.
The mountings are bolted directly at the spheroidal graphite iron feet to the screen and the support structure.
The AB-D offers a much higher loading capacity than the AB for the same compact design. The linear spring deflection under load is still sufficient to assure for this oscillating unit the respectably low natural frequency of approx. 3.2 Hz. At a vibrator or wave frequency of approx. 16 Hz, this is sufficient for a high insulation efficiency of approx. 95%. As with all screening machine mountings from ROSTA, the characteristic of the AB-D assists the linear oscillation motion of the screen. No lateral guides are necessary for passing through resonance in a controlled manner; the mounting is laterally stable. This low-cost oscillating unit offers sufficient insulation for all plants that are not mounted on high screen platforms or steel structures "above ground".
The units are mounted by directly bolting the steel supports to screen and support structure.
The housings of the double rubber suspension units are of aluminium profile for sizes
AB-D 18 to AB-D 45, and in spheroidal graphite iron for the three sizes AB-D 50.
The oscillating mounting type AB-HD is the "Heavy Duty" version in the AB mount family of the ROSTA screen suspensions. For example the AB-HD type 50-2 offers 40 % more load capacity compared to the standard version AB 50-2 (14′000 instead of 10′000 N) by a slightly higher natural frequency (f = approx. 2,7 Hz instead of 2,3 Hz).
The AB-HD screen mount is the ideal suspension for mining- and aggregate screen working under variable charging capacities and are less sensitive on possibly occurring overload situations. Furthermore, due to the high load capacity, these mountings are also predestined for screens submitted to impact loading situations (e.g. charged by front-end loaders).
All AB-HD oscillating mountings are also available in stainless steel (AISI 304) and interchangeable with the blue AB-HD oscillating mountings!
ROSTA oscillating mountings type ABI are maintenance-free elastic rockers for the support or suspension of freely oscillating vibrating equipment with a wide variety of designs and drive systems. They assist the driving forces in the conveying direction and assure good linear guidance of the oscillating part of the machine. The pantograph structure of the oscillating mounting allows large spring deflection under load, which results in low natural frequencies (down to approx. 2.2 Hz) and hence exceptionally high insulation efficiency towards the support structure. The great lateral stability of ROSTA oscillating mountings prevents the wobbling of the screen casing typical of helical spring mountings on passing through the resonant frequency.
The oscillating mounting type ABI-HD is the "Heavy Duty" version in the AB mount family of the ROSTA screen suspensions. For example the ABI-HD type 50-2 offers 40 % more load capacity compared to the standard version AB 50-2 (14′000 instead of 10′000 N) by a slightly higher natural frequency (f = approx. 2,7 Hz instead of 2,3 Hz).
The ABI-HD screen mount is the ideal suspension for mining- and aggregate screen working under variable charging capacities and are less sensitive on possibly occurring overload situations. Furthermore, due to the high load capacity, these mountings are also predestined for screens submitted to impact loading situations (e.g. charged by front-end loaders).
All ABI-HD oscillating mountings are in stainless steel (AISI 304) and interchangeable with the blue AB-HD oscillating mountings!
The ROSTA double suspension units type AD-P/AD-C are used for suspending and supporting two-mass shaker systems. The centre point, for frame fixation, is in the middle of the double rocker arm.
The ROSTA double suspension units type AD-P/AD-C are used for suspending and supporting two-mass shaker systems. The centre point, for frame fixation, is in the middle of the double rocker arm.
The AD-P suspension units are mounted by means of fixing flanges.
The ROSTA double suspension units type AD-PV/AD-C are used for suspending and supporting two-mass shaker systems. The centre point, for frame fixation, is in the middle of the double rocker arm.
The AD-PV suspension units are mounted by means of fixing flanges.
The ROSTA universal joints type AK are maintenance-free elastic joints which can be moved in any direction. They are used as universal joint supports for mounting or suspending gyratory screens, screening tables, tumbling oscillators, sorters and screening machines positively driven by eccentrics or freely oscillating with unbalanced drive.
The types AK 27 until AK 100-4 have got housings made of SC iron, all the other sizes are made of welded steel structures. The types AK 15 to AK 50 have got aluminium square sections, the other sizes have steel cores.
The ROSTA oscillating mountings type AR are maintenance-free elastic joints used for the same purposes as our other oscillating mounting types AU, AS or AD. The distance between the centres can be freely chosen. The commercial circular tube (connection between the two elements) must be supplied by the customer. The inner square profile is frictionally engaged to the machine frame, analogously to type AS-C and AD-C.
The ROSTA rocker suspension units type AS-P and AS-C are maintenance-free elastic guide arms used for the same purposes as the oscillating mountings type AU. This low cost model is suitable for fixed distances between the two bearings (rocker length A). The AS-C types are designed to be frictionally engaged to the machine frame. The central mounting allows an easy adjustment of the rocking angle.
The ROSTA rocker suspension units type AS-P and AS-C are maintenance-free elastic guide arms used for the same purposes as the oscillating mountings type AU. This low cost model is suitable for fixed distances between the two bearings (rocker length A). The AS-P types are mounted on the trough or the machine frame by means of fixing flanges.
The ROSTA rocker suspension units type AS-PV and AS-C are maintenance-free elastic guide arms used for the same purposes as the oscillating mountings type AU. This low cost model is suitable for fixed distances between the two bearings (rocker length A). The AS-PV types are mounted on the trough or the machine frame by means of fixing flanges.
ROSTA oscillating mountings type AU are maintenance-free elastic joints for suspending or supporting conveying troughs, screens, sorters and all devices excited by eccentric drives or unbalanced motors with directed oscillations. They are primarily used for installations with an effective distance between the single units (rocker length A) in special designed small serie shakers and troughs, i.e. in cases the spacing of the AS type does not fit the construction.
ROSTA oscillating mountings type AUI are maintenance-free elastic joints for suspending or supporting conveying troughs, screens, sorters and all devices excited by eccentric drives or unbalanced motors with directed oscillations. They are primarily used for installations with an effective distance between the single units (rocker length A) in special designed small serie shakers and troughs, i.e. in cases the spacing of the AS type does not fit the construction.
The ROSTA oscillating mountings type AV are maintenance-free elastic joints designed for guiding circular motions of hanging screens such as gyratory sifters and screens in flour mills, chemical processing plants and paper mills.
The rubber inserts of these oscillating mountings are larger than the ones of the other ROSTA elements. Therefore they intensively absorb the vibrations of the hanging sifters and better protect the building structures and ceilings.
All these mounting types have got housings made of cast aluminium; only type AV 50 has got an SC-cast-iron housing.
The cores are all made of aluminium profiles, also the size AV 40 and AV 40L. We start to produce the elements with the inner square made of light metal profile approx. within February 2014. All the dimensions are kept, that means the elements are fully adaptable with the previous version. The previous version is still available as a special element.
ROSTA anti-vibration mounts type AWI are intended for the absorption of medium and low frequency vibrations. The AWI elements are used in pairs (type R and L) in most applications and provide good linear guidance of the vibrating machine part.
These elements are maintenance-free, resistant to water and dirt and suitable for temperatures from -40°C to +80°C. The housing and the inner part are made of stainless steel (AISI 304).
ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!
ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!
The high-quality rider is made of friction resistant industrial plastic and allows the use on both rider sides. The max. permissible chain speed should not exceed 1.5 m / sec.
The high-quality rider is made of friction resistant industrial plastic and allows the use on both rider sides. The max. permissible chain speed should not exceed 1.5 m / sec.
Round housing and inner square section made of light alloy profiles, inner square section with four "throughbores", the lever arms can be bolted on and, if necessary, the bores can be tapped, too.
Round housing and inner square section made of light alloy profiles, inner square section with four "throughbores", the lever arms can be bolted on and, if necessary, the bores can be tapped, too.
Housing up to size 45 made out of light alloy profile, size 50 made out of spheroidal graphite cast iron, inner square section made out of light alloy profile with four "throughbores".
Steel housing with inner square section made of light alloy with four small bores. Levers can be mounted on one or on both sides by means of bolts.
Steel housing with inner square section made of light alloy with one big through bore. Levers can be mounted on one or on both sides by means of bolts. Type DR-C with central bore.
Housing made out of steel, inner square section made out of steel tube for mounting "plug-in" lever arms on one or both sides. The inserted part should be at least three times longer than the clearance "C".
The housings of the element sizes DW-A 15 to 38 are made out of light alloy profile and are equipped with lateral fixation flanges, including the required fixation bores for direct mounting on customers machine part. Inner square sections made out of light alloy profile with four small through bores or one central through bore.
The housings of the element sizes DW-A 45 and 50 are made out of light alloy profile, with inner square sections made out of aluminum. The inner square can be used for mounting "plug-in" lever arms on one or both sides.
The housings of the element sizes DW-A 45 to 50 are made out of spheroidal cast iron, with inner square sections made out of light alloy profile. Up from size 60, with housings made out of welded steel construction, with inner steel square sections including four threaded bores on each side for the easy fixation of levers and machine parts.
The housings of the element sizes DW-C 15 to 38 are made out of light alloy profile and are equipped with lateral fixation flanges, including the required fixation bores for direct mounting on customers machine part. Inner square sections made out of light alloy profile with four small through bores or one central through bore.
The housings of the element sizes DW-C are made out of light alloy profile and are equipped with lateral fixation flanges, including the required fixation bores for direct mounting on customers machine part. Inner square sections made out of light alloy profile with four small through bores or one central through bore.
The housings of the element sizes DW-S 15 to 38 are made out of light alloy profile and are equipped with lateral fixation flanges, including the required fixation bores for direct mounting on customers machine parts.
The housings of the element sizes DW-S 45 and 50 are made out of spheroidal cast iron, with inner square sections made out of steel tube. The inner square can be used for mounting "plug-in" lever arms on one or both sides.
ROSTA anti-vibration mounts type ESL are intended for the absorption of medium and low frequency vibrations and are designed to accept compression, tension and shear loading as well as combined loadings. They can be installed in any desired position and are also ideal for ceiling and wall mounting.
The ROSTA Type AB oscillating mountings have created a good name for themselves as screen box suspensions in screening technology thanks to their high isolation effect, high level of lateral stability, security against overload and high resistance to corrosion.
The ROSTA Type AB oscillating mountings have created a good name for themselves as screen box suspensions in screening technology thanks to their high isolation effect, high level of lateral stability, security against overload and high resistance to corrosion.
The new HSI suspensions (hanging screen) have a guide arm geometry that is designed for tensile loads. With ideal loading, the natural frequency of this suspension thereby sinks from its former 5.5 Hz to only approx. 3.5 Hz, which guarantees an isolating effect > 97 %. All HSI oscillating mountings are in stainless steel (AISI 304) and interchangeable with the blue HS oscillating mountings!
Customer benefits:
The self-adjusting universal Motor base for friction belt drives with drive power in the 90 kW to 250 kW range (motor frame sizes 315 M to 355 L or NEMA frame sizes 449T and 586/7 = 200-350 HP).
The ideal standardized motor base for smaller belt drives with electric motors from 0.75 to 4.0 kW (frame size dimensions 90 S/L to 112 M). This base is delivered completely assembled. Thanks to its extremely compact overall dimensions, the type MB 27 can be installed everywhere without any major design changes.
The new ROSTA motor base type MB 38 for motor frame sizes from 132 S to 160 L (3 to 15 kW) is now available on the drive component market - compact, operatorfriendly, ready for immediate installation and cost-effective. Its new features are, above all, the price, the ready-to-install design and the simplest-possible installation procedure with the new pre-tensioning device.
The type MB 50 is the most universal self-tensioning base for all friction belt drives with 7.5 to 45 kW electric motors (frame size dimensions 160 M S to 225 M). The standardized base plate can be installed on the rubber spring either "centered" or "off-set" according to the position of the driven pulley. The belt pretension can be continuously settled equivalent to the belt size and quantity.
Highlights: The new motor base type MB50 has 2 internal cardanic bushings, powerful front side pre-tensioning device(s) as well as a bolt retainer for easy and safe fixation.
The ideal standardized motor base for heavy duty belt drives with electric motors from 37 to 200 kW (frame 250 M to 315 S). This motor bases is available in four different lengths, according to the relevant motor size. The pretensioning device can be attached in 11 different positions, allowing to incline the base plate according to the ideal working angle. The belt pretension can be continuously settled, equivalent to the belt size and quantity. All steel parts are painted with a blue primer.
Machines, apparatus, installations only work as well as they stand! Both machine mount types are equipped with swivel-articulations for the compensation of ground unevenness.
The advantages of these machine mounts are:
shock absorbing, anti-slip, corrosion-resistant, with levelling system
Machines, apparatus, installations only work as well as they stand! Both machine mount types are equipped with swivel-articulations for the compensation of ground unevenness.
The advantages of these machine Mounts are:
food safe, corrosion-resistant (1.4301/1.4305), antibacterial
The roller is made of high-quality industrial plastic material with two self-lubricating ball bearings 2Z.C3.
The tensioning roller is made of industrial plastic material with two self-lubricating ball bearings 2Z.C3 and is designed for light-duty drives.
The tensioning element with the specification SE (SE 11 to SE 50) is the mostly used standard unit for tensioning of all kind of chain and belt drives. The elastomeric inserts are based on a high elastic natural rubber with a good shape memory. This unit is designed for applications in temperatures from -40° to +80°C (-40° to +180°F)
The ROSTA tensioning elements type SE-F is designed for front mounting applications on "blind" frame structures. Rubber quality, tensioning pressure, material and surface protection are identical to the type SE. The special fixation screw with distance bushing is zinc-plated and secured in the housing by means of a rubber 0-ring.
The ROSTA tensioning element type SE-FE is designed for front mounting applications on engines such as cooling compressors and fan drives. Steel parts are black painted.
Today nearly all busses for passenger transport are equipped with an air-conditioning system. The diesel engine of the bus serves thereby as energy source of the cooling compressor. The piston- or rotation compressors are driven via V- or Poly-V belts from the spur wheel of the main engine. This belt transmission requires a slippage-free power train to ensure the full capacity of the cooling compressors.
ROSTA designed for this specific application a heat resistant tensioner - powerful, compact with a long compensation travel.
The tensioning element type SE-G (marked with yellow dot) has zinc-plated steel parts and therefore is specially designed for "outdoor" applications; e.g. for building machines.
The ROSTA tensioning elements type SEI are all made out of stainless steel. They are available off-the-shelve in four different sizes: SEI 15, 18, 27, housing in SS casted version, SEI 40 (similiar to SE 38), housing in SS welded version.
The tensioning element type SE-W (marked with red dot) is equipped with heat resistant elastomeric inserts. It is developed for applications in temperatures from +80° to +120°C (+180° to 250°F), such as belt tensioners for diesel engines, chain tensioner in driers, belt scraper in hot surroundings, etc.
ROSTA oscillating drive heads type ST are flexible joints transmitting the acceleration forces from eccentric drive to the oscillating machine part - free of play, silently, reliably and without requiring maintenance. The common maintenance problems which are characteristic of these drive components are thus eliminated.
ROSTA oscillating drive heads type STI are flexible joints transmitting the acceleration forces from eccentric drive to the oscillating machine part - free of play, silently, reliably and without requiring maintenance. The common maintenance problems which are characteristic of these drive components are thus eliminated.
ROSTA anti-vibration mounts type V are multi-directional dampers and are designed to accept compression, tension and shear loading as well as combined loadings. They can be installed in any desired position and are also ideal for ceiling and wall mounting.
The ROSTA sprocket wheel set completes the tensioning element for applications in chain drives. The sprocket wheel runs on a self-lubricating ball bearing 2Z.C3.
ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!
