9 - AHP Merkle GmbH

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60 Buckling strength Proper dimensioning of hydraulic cylinders with pushing load makes use of the four so-called Euler buckling modes. Because the following calculations already include a quintuple safety margin, the results can be used directly. d: Piston rod diameter [mm] F: Axial force [N] L: Mounting distance [mm] First Euler buckling mode: piston rod is neither guided nor fastened – cylinder fi xed L = Second Euler buckling mode: piston rod and cylinder with rotating bearing L = Third Euler buckling mode: piston rod with rotating bearing – cylinder fi xed L = Fourth Euler buckling mode: piston rod guided and fastened – cylinder fi xed L = π 3 • d 4 • 164.06 F π F 3 • d4 • 656.25 π F 3 • d4 • 1312.5 π F 3 • d4 • 2625
! 1.4 Pressures in hydraulic cylinders Tip Pressure spikes In the operation of hydraulic cylinders, it is a basic rule that the permitted pressure values must not be exceeded, even for a short time. It must be ensured that no pressure spikes occur in the system, either caused by the pump, nor due to external mechanical infl uences. Otherwise damage may result in the seals or the cylinder. Pressure spikes due to highly dynamic motions must always be absorbed by means of separate cushioning measures in the cylinder (cushioning) or outside of the cylinder (shock absorbers). It must always be ensured that the momentum of the motion process is NOT dissipated in the end positions of the cylinder. In special applications such pressure spikes are unavoidable. Thus, for example, pressure spikes can occur during stamping whose level is many times that of the system pressure. Normal hydraulic cylinders are not suitable in this case; for such applications there are special stamping (block) cylinders that are designed for such extreme loads. 1.5 Drag flow pressure AHP Merkle designs the cylinders in such a manner that under normal conditions there is no drag fl ow pressure. However, in unfavorable operating conditions it is possible for a drag pressure, which is higher than the pressure in the cylinder chamber, to build up on the rod end between the primary and secondary seal of the rod system. This can happen, for example, if external forces cause the piston rod to retract in such a way that the seal is not able to return the leak oil – e.g. due to vibrations or impacts. If the drag pressure increases excessively, damage to the primary seal and thus failure of the sealing system may result. 1.6 Seal systems Tip ! Modern sealing system are composed of various individual components (e.g. sealing ring, supporting ring, wiper, etc.), each of which has its corresponding purpose. Adapting them properly to the particular operational requirements has a decisive effect on how long hydraulic cylinders can operate without faults. Among other things, this means that seals that provide proper sealing under high pressures are not necessarily suitable for low pressures. AHP Merkle‘s years of experience in the development and production of hydraulic cylinders resulted in the selection of seals that cover the widest range of applications possible. The compatibility of the hydraulic fl uid with the seal material has to be tested. 1.7 Operating temperature Tip ! Basic information about hydraulic cylinders en For standard hydraulic cylinders, the upper limit for the operating temperature is 80 °C (176 °F). This is based on the selection of seals, which are composed of the elastomers polyurethane (PU), polytetrafl uorethylene (PTFE) or nitrile butadiene rubber (NBR). With temperature-resistant seals such as fl uororubber (FKM) it is possible to achieve as a maximum operating temperature of up to 200 °C (392 °F) in special cases. Short strokes lead to a very small oil exchange in the cylinder chambers and thus to heating of the pressure fl uid, which also has a negative effect on the seals. The resulting lack of oil circulation results in increased oil contamination (e.g. due to wear) and reduction of the oil additivization. With regard to the temperatures arising during operation of hydraulic cylinders it must be noted that all of the design elements have been dimensioned for this temperature. These include not just seals, guides, switches, etc., but also the hydraulic fl uid itself. Furthermore, the compatibility of the hydraulic fl uid with the seal materials has to be tested. 61
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ahp.book 3.0 BZN 250 1/60 ahp.plus
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ahp.plus Schnelllieferprogramm Für
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ahp informiert. 1 Grundlegendes zu
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2.7 Zentrierbund . . . . . . . . .
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Page 16 and 17: 1.3 Allgemeine Berechnungen ! 12 Um
Page 18 and 19: 14 Knickfestigkeit Zur richtigen Di
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Page 28 and 29: 2 Zylinder Merkmale 2.1 Bauteildefi
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Page 32 and 33: 28 Mehrstellungszylinder Der Mehrst
Page 34 and 35: 2.7 Zentrierbund 2.8 Nut ! 30 Wird
Page 36 and 37: Tipp 2.10 Korrosionsbeständige Aus
Page 38 and 39: ! 3.2 Magnetfeldsensoren 34 Magnetf
Page 40 and 41: 4 Betriebs- und Wartungshinweise 4.
Page 42 and 43: ! 38 Montage der Stangendichtung Be
Page 44 and 45: ! Tipp ! 40 Montage von Führungsb
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Page 52 and 53: STZ 250 40-63 2 80-100 125-200 RZ 5
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Page 60 and 61: 56 Circular block cylinder (RZ) Cir
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Page 72 and 73: 68 Leakage oil As a special design
Page 74 and 75: 2 Cylinder parameters 2.1 Component
Page 76 and 77: 2.4 Hydraulic cylinders with specia
Page 78 and 79: 74 Multiposition cylinders Multipos
Page 80 and 81: 2.7 Centering collar 76 If the cyli
Page 82 and 83: Tip 2.10 Corrosion-resistant design
Page 84 and 85: ! 3.2 Magnetic field sensors 80 Mag
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Page 88 and 89: ! 84 Installing the rod seal If the
Page 90 and 91: ! Tip ! 86 Installing the guide rin
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Page 94 and 95: 90 Adjustable inductive proximity s
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Page 98 and 99: STZ 250 40-63 2 80-100 125-200 RZ 5
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Page 109 and 110: ! Info Pour les charges de poussée
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! Les HFC sont ce que l‘on appell
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! Info La mise en place de diviseur
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! Pour obtenir une durée de vie la
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2.2 Qualité de finition des tiges
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! Vérin double effet - poussée Il
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! Info Conclusion Les vérins hydra
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2.9 Extrémités de tige de piston
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3 Capteurs et systèmes d‘interro
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3.3 Capteurs mécaniques Les princi
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! ! Info Lorsque tous les travaux d
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Info ! Montage du joint de piston L
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4.4 Obtenir des pièces de rechange
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! 4.6 Réglage de l‘amortissement
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! 4.8 Consignes générales de séc
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Vérin-bloc BZ 500 BZ 320 BRB 250 B
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Fichier Unité tire-noyau KZE 251 V
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ahp produziert. 1 Blockzylinder Blo
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Blockzylinder Block cylinder Vérin
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Typ Type Type BZ BZ 250 BZN BZN 250
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36 01 02 04 05 ... .9 Typ Type Type
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N m Z G4 Mit Nut With keyway Avec r
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Optionen Options Options V E… N m
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Nenndruck, statisch Nominal pressur
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BZ 500 BZ 500.50/32 BZ 500.63/40 BZ
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Optionen Options Options V E3 G4 Si
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Optionen Options Options V E… N m
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BZN 500.06 BZN 500.36 201 206 40 44
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BZN 500.50/32.N20 Hub Stroke Course
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Optionen Options Options V E3 G4 Si
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Mit Magnetfeld-Sensoren With magnet
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Wegmesssysteme für Blockzylinder (
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MBZ 160.32/20 Hub Stroke Course 10
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MBZ 160 MBZ 160.50/32 MBZ 160.63/40
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Schalterposition Position of switch
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Optionen Options Options V E... H20
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Optionen Options Options BRB / BRBN
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Optionen Options Options V E... N m
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Dichtsatz komplett Seal kit complet
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Verschraubung komplett mit Dichtung
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Ersatzschalter Replacement sensor D
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Ersatzschalter Replacement sensor D
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1/139
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Stanzzylinder Stamping cylinder Vé
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Bauform Style Forme 01 02 03 04 05
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N m Z Mit Nut With keyway Avec rain
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2/11
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Rundblockzylinder Circular block cy
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Bauform Style Forme 3/4 01 05 Ab La
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RZ 500.63/40 Hub Stroke Course 30 6
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Schiebereinheit Push unit Pousseur
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Typ Type Type BSE BSE XL BSEP ZSE Z
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Ausführung Mode Mode Mit Führungs
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Schalterdaten Switch data Caractér
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BSE 250 BSE 250.50/32 BSE 250.63/40
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Bauform Style Forme 1 2 1 2 201 V A
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4/35
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Standardzylinder Standard cylinder
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Typ Type Type UZ 100 * UZN 100 HZ 1
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Funktionsarten Operation mode Mode
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M1 M2 M T Kolbenstange mit Innengew
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Position der Näherungsschalter, D
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5/11
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Optionen Options Options V E… BAO
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Grundlagen Basic principles Princip
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Spare parts MHZ 160 Pièces de rech
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Normzylinder DIN standard cylinder
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Befestigungsarten Mounting modes Mo
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Lage der Anschlüsse Position of co
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Hydraulikzylinder mit äußerer Fü
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Funktionsarten Operation mode Mode
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Nenndruck Nominal pressure Pression
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7/7
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Kurzhubzylinder Short-stroke cylind
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Typ Type Type WKHZ KHZ WKHZ Seite P
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Schnelllieferprogramm KHZ und WKHZ
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8/11
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Einschraubzylinder Screw-in cylinde
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Funktionsarten Operation modes Mode
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9/7
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Kernzugeinheit Core pull unit Unit
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Typ Type Type KZE KZEP 204 V PR PL
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Zulässiges Drehmoment [Nm] Permitt
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Ersatzschalter Replacement Sensor D
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Flanschzylinder Flanged cylinder V
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Bauform Style Forme 01 Ab Lager Fro
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Doppelrohrzylinder Double-lined cyl
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Bauform Style Forme 05 15 12 02 Fun
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12/9
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Spannelemente Clamping elements El
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Typ Type Type BZK 250 BZF 500 SZ 25
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13/11
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Drehantrieb Rotary drive unit Servo
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Funktionsarten Operation modes Mode
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ahp.spezial 15/1 15
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Mehrstellungszylinder Der Mehrstell
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Zweikraftzylinder - ziehend Bei die
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Zubehör Accessories Accessoires 16
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Kupplung Coupling Accouplement Arti
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Schutzrohr Protection tube Tube pro
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018883 GEG. M16 . 20 Artikelnummer
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Lagerbock LB-LD Bearing pedestals L
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Bolzen BO-PP Bolts BO-PP Axes de fi
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Gelenk RC Joint RC Articulation RC
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Haltewinkel Fixation angle Equerre
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Artikelnummer Part number Numéro d
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Abb. A Abb. B 021701 156897 021699
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Schaltertester Switch tester Testeu
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28 B A 80 132 132 M8 Schalter Ansch
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Einmaulschlüssel (passend für AHP
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ahp.international North America Eur
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9 - AHP Merkle GmbH

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