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® ®
EMDG 198
Airstroke actuators/Airmount isolators
R
IRSTROKE IRSTROKE IRSTROKE
ACTUA ACTUA ACTUATORS TORS TORS
R
IRM IRM IRMOUNT OUNT OUNT
I IIS S SOLA OLA OLATORS TORS TORS
Engineering Manual
& Design Guide
EMDG 198
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TABLE OF CONTENTS Table of Contents and Introduction...............................2 Airmount Vibration Isolation Selection Procedure and Isolation Formula .......21-22 Advantages of Airstroke Actuators ...............................3 Dynamic Spring Rate Formula ................................22 Advantages of Airmount Isolators.................................4 Natural Frequency Formula.....................................22 Air Spring Bellows Construction .................................
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ADVANTAGES OF FIRESTONE ® AIRSTROKE ACTUATORS Why use an Airstroke actuator (rather than air or hydraulic cylinder) for actuation? LOW COST Generally, initial cost is one-half or less than conventional pneumatic or hydraulic cylin- ders of the same force capabilities. This initial cost advantage is many times greater in the larger sizes. WIDE SIZE RANGE Airstroke actuators are available in sizes ranging from 2.2 inches to 37 inches in diameter. The force capability is 100,000 pounds. Strokes of
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ADVANTAGES OF FIRESTONE ® AIRMOUNT ISOLATORS Why use an Airmount isolator rather than a coil CONSTANT ISOLATION EFFICIENCY spring or other type of isolator? Airmount isolators are unique in that the system’s natural fre- quency does not change significantly with changes in load. UNSURPASSED ISOLATION CAPABILITY This unique feature, combined with accurate height control, will Airmount isolators can provide the highest degree of isolation allow the use of the same Airmount isolator at each mount
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AIR SPRING BELLOWS CONSTRUCTION OUTER COVER SECOND PLY FIRST PLY INNER LINER An air spring is a carefully designed rubber/fabric bellows The two ply air spring is standard. Where high strength con- which contains a column of compressed air. The rubber bel- struction is available, it is so noted in the selection guide lows itself does not provide force or support load. This is done (page 32), on the individual Data sheets, and in the index by the column of air. (page 107). If the high strength s
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END CLOSURE OPTIONS Each individual air spring data sheet shows a cross sectional attachment is shown. For convoluted air springs 17 inches in view of the most popular end closure option for that part. For diameter and larger, a Bead Ring attachment is shown. An air convoluted air springs 16 inches in diameter and less, and for spring of each variety, with proper terminology for each, is the reversible sleeve air springs, the Crimped Bead Plate shown on the following pages. CRIMPED BEAD PLATES C
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CRIMPED BEAD PLATE MOUNTING HARDWARE CRIMPED BEAD PLATE AIR SPRINGS Use the blind customer supplied mountIng plate and tightening into the nuts for attachment. This is accomplished by bringing bolts blind nut. If this bolt is too long, it may fracture the bottom (two or four depending upon air spring size) through the out of the blind nut. To Air Supply 3 /8-16 UNC Blind Nut, 5 /8" Deep Customer Supplies Mounting Plates Bolts & Washers 5 /8" 5 /8" Tightening Torque on the blind nut: 15 to 20
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END CLOSURE OPTIONS STEEL BEAD RINGS MOUNTING PLATE is not included. See page 10 for CONVOLUTED AIR SPRINGS (#22 is shown, with bead rings instead of material, machining recommendations, and installation crimped bead plates) instructions. BEAD RING BOLT May be one of four varieties. See page 10. Also refer to the data sheet order block on each individual part for bolt lengths. NUTS AND LOCKWASHERS are included with the part. (Except for socket head type bead rings). 1 BELLOWS Wall gauge is appro
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END CLOSURE OPTIONS LARGE PARTS WITH ALUMINUM BEAD RINGS All of the parts that are shown with crimped bead plates 3. When used as an Airmount isolator with an auxiliary are also available with bead rings. (Bead plates are not reservoir (See page 24). suitable for some applications.) Typical examples of 4. When air must move in or out of the unit at an extremely where bead rings are often used follow: 3 fast rate (and a /4" NPT air inlet is too small). 1. Where parts are stacked to increase strok
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END CLOSURE OPTIONS THE FOUR TYPES OF BEAD RINGS BUTTON HEAD STEEL COUNTERSUNK STEEL SOCKET HEAD RIBBED NECK BEAD RING BEAD RING ALUMINUM ALUMINUM BEAD RING* BEAD RING Used on 4.5 in. Bolt Circles Use M6 Cap Screws, (Not Included) Bolt Bolt Bolt Length Length Length Customer Customer Customer Customer Effective Effective Effective Supplies Plate Supplies Plate Supplies Plate Length Supplies Length Length Plate Optional Shorter Length Ribbed Neck Bolt Standard Bolt Length (in.) Standa
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END CLOSURE OPTIONS LARGE PARTS WITH ROLLED PLATES LARGE CONVOLUTED AIR SPRINGS (#203 is shown, with rolled plates instead of bead rings) The convoluted parts, with 17, 20, and 22 inch diameter, Again, for the blind nut and air entrance locations of rolled are shown with bead rings as standard. We have devel- plate parts (bead rings are shown as standard on the oped a method for permanently attaching plates to these data pages), please refer to the selection guide on page larger sized Airstroke
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HOW TO USE THE STATIC DATA CHART We also refer to this chart as the load/deflection (L/D) curve for an air spring. The force [1] is given [ ] 6 on the right hand axis vs. the air spring height [2] Recommended Airmount Static Data as shown along the bottom axis; thus, load vs. Design Height 1227 deflection. The internal volume [3] is also given 9.5 Inches along the left hand axis, again vs. height [2]. It is called static data because the air spring is in a static, or non-moving, constant pressu
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(There is one exception: notice the plateau section of EXAMPLE: Support a 4,100 pound load with an air spring. reversible sleeve 1T type curves). In the example the effective Would a #22 be appropriate, and if so, at what height? The area of a #22, at 4.0 inches using the 80 psi curve, is: height isn’t much of a problem, as this part SHOULD BE USED AT 9.5 INCHES. Simply move up the darkened line to 7,180 lbs. 2 = 89.8 in where it intersects 4,100 Ibs [14]. That point falls between the 2 80 Ibs/i
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BASIC PARAMETERS APPLICABLE TO ® BOTH AIRSTROKE ACTUATORS AND ® AIRMOUNT ISOLATORS MEDIA TEMPERATURE Air springs are designed for use with compressed air. Nitrogen 1. STANDARD BELLOWS. Our standard industrial air springs is also acceptable. Air springs may be filled with water or water- should be limited to use in the range: glycol (automotive antifreeze) solutions. If water is to be used, – 35° F to + 135° F. rust inhibitors should be added to protect the end closures. Two reasons for liquid fi
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AIRSTROKE ACTUATION 2. In EXTENSION, an upstop is required to prevent the air SELECTION spring from overextending at heights into the shaded area of 1. Refer to the selection guide on page 32 for Airstroke force the graph. The reasons for this are twofold: a) the life of the and stroke capabilities. After your list of possibilities has been bellows may be reduced and b) the crimp may open up, reduced to one or two air springs, then turn to the individual allowing the bellows bead to blow out of
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Angular Capability continued Please note that the air spring forces are not additive in this configuration. A method for guiding, which also illustrates one These measurements must fall within the guide lines for that center ring concept for mounting the two parts together at the particular part. Consider style #22 in the following scissors middle, is illustrated below: arrangement: Calculate Force Here Max Ht Max Ht (Must be ≤ 10.1) Center Ring #22 (Must be ‡ 3.0) Pivot Point Reversible sleeve
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AIRSTROKE 17 INFLATION PRESSURE CHART MAXIMUM RECOMMENDED INTERNAL PRESSURES FOR CONVOLUTED ® TYPE AIRSTROKE ACTUATOR APPLICATIONS 1 BASED ON APPROXIMATELY /3 NORMAL BURST VALUES APPLICATIONS WHICH EXCEED THESE LIMITS SHOULD BE REVIEWED WITH FIRESTONE. 250 BEAD RING STYLE 200 REFER TO EACH INDIVIDUAL DATA PAGE FOR MAXIMUM 150 USABLE HEIGHT RESTRICTIONS TWO PLY 100 50 0 18 16.5 15 13.5 12 10.5 9 7.5 6 4.5 TRIPLE CONVOLUTED 12 11 10 9 8 7 6 5 4 3 DOUBLE CONVOLUTED 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2
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® AIRSTROKE ACTUATOR PROBLEM SOLVERS GATE VALVE OPERATOR GLUING PRESS DIE STRIPPER WEB TENSIONING DEVICE AIRSTROKE ACTUATOR PAPER KNIFE SPRING ACTUATOR QUENCH TANK ACTUATOR ROTATION KNIFE LOG QUENCH TANK AIRSTROKE ACTUATORS UPPER & LOWER POSITIVE STOPS PAPER SIZING PRESS PICKLING TANK ACTUATOR AIR LINES PRESS PIVOT ACID TANK ACID FRAME WIRE COILS QUICK LOCK DEVICE PRESSURE ROLL FOR CALENDER 18
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® AIRSTROKE ACTUATOR PROBLEM SOLVERS CORE STRAIGHTENER MISSILE ASSEMBLY FIXTURE AIRSTROKE ACTUATOR BELT TAKE UP ROLLER FRICTION BRAKE FRICTION PAD AIRSTROKE ACTUATOR PIPE INDEXING THREADING OSCILLATING DOCTOR FOR PAPER END VIEW OF PIPE CALENDER ROLL DOCTOR CYLINDER FORMING PRESS CABLE TENSIONING DEVICE PRESS PLATEN BAG FLATTENER TORSIONAL FRICTION BRAKE POWERED AIRSTROKE ROLLER ACTUATOR DRIVE BELT BAG OF ROLLER MATERIAL TO BE LINESHAFT SUPPORT FLATTENED FRAME TORQUE TUBE AIRSTROKE BRAKE B
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® AIRSTROKE ACTUATOR PROBLEM SOLVERS HINGED GATE HOT FOIL STAMPING PRESS AIR FITTING AIRSTROKE ACTUATOR AIRSTROKE ACTUATOR COMPRESSED POSITION WEIGH HOPPER EXTENDED POSITION CLOSED TORSION SPRING OPEN HINGE ACTUATED HEAVY DUTY SEALER PIVOTED CLAMPING DEVICE AIRSTROKE ACTUATOR AIRSTROKE ACTUATED ROLLER STOP HINGED ACTUATED GRAVITY GATE RUBBER ADJUSTABLE AIRSTROKE COLLAPSE STOP ACTUATOR HEIGHT AIRSTROKE RETURN TENSION ACTUATOR SPRING SCISSOR LIFT VERTICAL ACTUATED DRIVE TABLE TOP OF CHAIN IN
