250 (9.84) 170 (6.69) 225 (8.85) 75 (2.95) 300 (11.81)

Transcription

1 Air bellows, single acting Ø... / inch Suitable for applications on rail vehicels Almost frictionless operation No maintenance or lubrication Weather/corrosion resistant metal parts Approvals for fire and smoke restistance Typical applications; actuator, air spring, or vibration isolation Technical features Medium: Compressed air lubricated or unlubricated, Nitrogen, water (with glycol) Operation: Single acting Operating pressure:, bar (79 psi) recommanded dynamic pressure ( psi) max. Technical data Operating temperature: Static -... (+7 C) see Note Static -... (+ F) Dynamic -... (+ C) Dynamic -... (+ F) The numbers in brackets represent the maximum permissible operating temperature. NB. When operated at this temperature for pro-longed periods, the bellow will experience a reduce working life. Nominal diameters:,,, / inches Strokes: From... mm max., depending on diameters and number of convolutions Important instructions: see page Note When operated at +7 C (+ F) for pro-longed periods, the bellow will experience a reduce working life. Static = constant/unchanging external load Dynamic = vibration or a changing internal pressure as a result of changing external load Materials: End plates: steel, chromplated Studs: steel, zinc plated Central ring: aluminium or steel, chromplated, partly moulded in Bellow: NR/BR, SBR compound rubber Models M/ M/ M/ M/ M/ M/ M/ M/ M/ M/ M/ Norminal Ø / / / Air port G / G / G / G / G / G / G / G / G / G / G / Norminal Ø x convolutions x x x x x x x x / x / x / x Recommended max. stroke in mm Stroke in mm Installation height min. in mm Installation height max. in mm Recommended max. working height in mm Retracting force in N (lbs) to reach min. height Clearance around the air bellow in mm Weight in kg (lb) Theor. thrust in N (lbs) at (7 psi) at installation height min. Theor. thrust in N (lbs) at (7 psi) at installation height max. Vibration height in mm (.) (.97) (.9) (.) (.97) (9.) (.) () (9) (.9) (.7) (.9) (9.) (.) (9.) (9.), (.) (7) () (7.7) (.) (.9) (.97) (.9) (.) (.7), (9.) () (79) (.7) 7 (.9) (.) (9.) (.7),7 (.) () (9) (.) (9.) () (.9) (.9) (.7) (.), (.) (97) 7 (7) (.) (.9) (.97) (.9) (.) (.9) (.7), (.9) 9 (77) (7) * (.7) 7 (.9) (.) (9.) (.) (.7), (.) 97 (9) (7) (9.) (9.) () (.9) (.9) (.7) (.) (.7),9 (.) (97) () (.9) (.9) (.97) (.9) (.9) (.7) (.7) 7, (.) 9 () 7 () * (.) (.7) (.) (.9) 9 (.) (.9) (.7), (.9) 9 (7) (9) (9.) at vibration height,, 7, *, * 9,, * Stiffness at bar ( psi) in N/mm 7, * 7 9 * * (lbs/inch) () () () () () () () () Airspring natural fn frequency (Hz),,, *,,9 *,, * at bar ( psi) Isolation rate I in % at Hz and bar ( psi) 9, 9, 9, 9, * 9, 9,7 * 9,9 97, * Max. torque in Nm (inch/lbs) for mounting studs or holes (7.) (7.) (.) (.) (.) (.) (.) (.) (.) (.) (.) (.9) (.9) (.9) (.) (7.) (.7) 9, (.) 9 () () * (.) N/rw/en...

2 Options selector M/ Nominal diameters (inches) Substitute / Number of convolutions Substitute Ordering example To order a compact air bellow in standard rubber material, a nominal diameter of inches and convolutions quote: M/ Important instructions: Thrust: The thrust depends on the height of the bellow. When height increases - the thrust decreases. - Before installing the air bellow, check it carefully for any damage it may have suffered from transport or improper storage. - Do not inflate the air bellow until it has been secured properly. Clearance: There must be enough clearance around the air bellow. - The full surface of the metal parts is to be used to bear the forces. - Air bellows must be equipped with lateral guides. - Deflate the air bellows fully before removing. - Ensure that the bellows is not constantly in contact with hydraulic oil, lubricants, solvents, metal cuttings and welding sparks. Stops: To avoid damage when the bellow is compressed or extended mechanical stops at both end positions have to be used. - Should the air bellow be subjected to special media in an application, ask Norgren for further information, specifying the medium, temperature and concentration N/rw/en...

3 Basic dimensions M/... M/ Dimensions shown in mm A, M A ø N B C F D E G / Installation diameter min. Installation height min. Installation height max. Stroke Recommended max. working hight Norminal Ø Recommended Recommended Stroke Installation Installation Max. torque for Ø E Ø D Ø F Ø N Weight Models x convolutions max. stroke (mm) max. working height B (mm) (mm) height A min. (mm) height C max. (mm) mounting studs (Nm) (kg) x, M/ x,, M/ x 7, M/ x 7 7,7 M/ x 7, M/ x, M/ x 7, M/ x,9 M/ / x, 7, M/ / x 9,, M/ / x, 9, M/ N/rw/en...

4 Thrust (at,,, ), volume (at ) M/ M/ M/ M/, 7, 7, bar bar,, bar bar bar bar bar bar M/ M/ M/ M/ bar bar bar bar bar bar bar bar Caution! Ensure that all applications are within the max. installation height. For applications in the grey area please contact Norgren technical service. N/rw/en...

5 Thrust (at,,, ), volume (at ) M/ M/ M/ 7 7,, 7, 7, bar bar,, 7, bar bar bar, bar 7 9, 9 Caution! Ensure that all applications are within the max. installation height. For applications in the grey area please contact Norgren technical service. N/rw/en...

6 Operation angle Out of alignment α H H Table Norminal Ø x convolutions max. α max. A Models x M/ x M/ x M/ x M/ x M/ x M/ x M/ x M/ / x M/ / x M/ / x M/ Installation height min, see page Installation height max, see page A Operation angle Tilt angles from... are possible, depending on the air bellow design. Ensure application is within minimum and maximum installation heights. N/rw/en...

7 Application example - Air bellow as an actuator A kg conveyor carrying a kg pallet needs to be lifted by 9 mm (stroke) in order to transfer the pallet to another level. Four () air bellows should be used. The available operating pressure is bar. The operating temperature is C. There is a 7 mm square space to house each air bellow. Compression and extension stops are provided. The air bellows have to be mounted in a space which is mm apart. During the lifting operation the conveyor may tilt in the second half of the stroke by a max. of 9. Step : Check the thrust at at a height of mm. From the charts in the datasheet we can see that: Step : Fill in and complete the datasheet a) Total weight to be lifted: F = ( kg + kg) m/s = N b) Number of air bellows: n = c) Thrust per air bellow: f = N = N d) Operating pressure: P = bar e) Required stroke: S = 9 mm f) Vertical space: Xv = mm g) Horzontal space: Xh = 7 mm h) Operating temperature: T = C i) Operation angle: a = 9 j) Out of alignment: A = mm k) Chemical resistance: normal environment Step : From table (technical data) air bellows have to be selected, that have a min. 9 mm stroke and clearance around the air bellows smaller than Xh = 7 mm. We select: M/ Step : Calculate the total height at which the air bellow should be used, see step : Vertical space Xv mm Stroke S 9 mm Total height mm By refering to the total height of mm and the vertical space of mm, only M/ (installation height min. to recommended max. working height mm) can be used from table (technical data). The max. installation height is mm. mm installation height min. of M/ plus 9 mm stroke. N = N at bar Result: The air bellow M/ can provide the required thrust of N. Step : Check the operation angel and the out of alignment when the selected air bellow can tilt. i) max. operation angle is higher as existing operating angel 9. j) max. out of alignment is mm is higher as existing alignment mm. Result: M/ can be used. bar bar M/ will provide N at. To get the figure for bar, we have to calculate: Step : Check all remaining parameters h) At C Standard rubber material - C... (+ 7 C) Static ; - C... + C Dynamic k) No special chemical resistance is required Result: M/ is the chosen air bellow, because it meets all requirements. N/rw/en...7

8 Application example - Air bellow as a vibration isolator A hydraulic power unit with an excitation frequency (fe) between and cycles/min (= to Hz) must be vibration isolated. The total weight of the power unit is kg. The supporting area under the unit is, m x, m. The operating temperature is C. The space for the installation is mm high. Four air bellows will be used. The max. operating pressure is bar. A minimum of 97% vibration isolation has to be reached. Step : Check the thrust at bar at a height of mm. From the charts in the datasheet we can see that. Step : Fill in and complete the datasheet 7 a) Total weight to be isolated: F = kg m/s = N b) Number of air bellows: n = c) Thrust per air bellow: f = N = 9 N d) Operating pressure: P = bar f) Vertical space: Xv = mm g) Horizontal space: Xh = mm (, m /) h) Operating temperature: T = C k) Chemical resistance: normal environment m) Isolation rate: I = 97% p) Excitation frequency fe = min. Hz, max. Hz bar bar Two types of air bellows are chosen. Each one has to work with a vibration height lower than mm and fit in a horizontal space samler than mm. From table (technical data) we select:. M/ - Vibration height mm - Clearance around the air bellow (mm) - Airspring natural frequency fn at bar, (Hz). M/ - Vibration height mm - Clearance around the air bellow (mm)- Airspring natural frequency fn at bar,9 (Hz) Step : Take the air bellow with the lowest airspring natural frequency fn =, Hz in order to get the highest isolation rate refering to fe min. = Hz. Air bellow M/ is chosen. Step : Calculate the isolation rate (I) of the M/ by using the formula: M/ will provide N as a vibration height of mm at bar. Step : Check all remaining parameters h) At C Standard rubber material (- to +7 C) can be used. g) No special chemical resistance is required. Result: x M/ air bellows are chosen. They will provide 99,% vibration isolation and lift the kg weight at bar. Formula: I = - ( fe ) fn - Example: I = - ( ), - I = - =,99, I = 99,% Warning These products are intended for use in industrial compressed air and rail transport systems only. Do not use these products where pressures and temperatures can exceed those listed under Technical features. Before using these products with fluids other than those specified, for non-industrial applications, life-support systems, or other applications not within published specifications, consult NORGREN. Through misuse, age, or malfunction, components used in fluid power systems can fail in various modes. (fn) fe = Excitation frequency of load fn = Airspring natural frequency (fe) (fn) The system designer is warned to consider the failure modes of all component parts used in fluid power systems and to provide adequate safeguards to prevent personal injury or damage to equipment in the event of such failure. System designers must provide a warning to end users in the system instructional manual if protection against a failure mode cannot be adequately provided. System designers and end users are cautioned to review specific warnings found in instruction sheets packed and shipped with these products. N/rw/en...