9 - AHP Merkle GmbH
9 - AHP Merkle GmbH 9 - AHP Merkle GmbH
4.5 Assembly and commissioning of hydraulic cylinders ! Tip ! 88 Mounting screws for cylinders and add-on parts have to be designed and mounted in such a way that they can absorb all foreseeable forces. As much as possible the screws should be free of shear forces. (see also „General safety instructions“) When installing cylinders it must be ensured that no distortion of the cylinder occurs. This can always happen when the machine or system does not meet the mounting specifi cations due to improper mechanical construction or excessive manufacturing tolerances. The result of this is that mounting points are not properly aligned or undesirable side forces occur. Before commissioning of hydraulic cylinders hydraulic systems, the technical personnel must make sure that there is no contamination or residue from manufacture or assembly of the component parts (e.g. chips) remaining in the system. To do this, it is advisable to clean the hydraulic system several times with rinsing fl uid, while also using fi lter equipment. Once all of the hydraulic supply lines have been cleaned and fi tted pressure-tight, the actual commissioning can begin. The subsequent fi lling of the hydraulics with the specifi ed pressure fl uid should be performed using separate fi lling units that clean the new hydraulic fl uid already. This is because practice has shown that new oil is in no way clean enough to meet the requirements of certain hydraulic systems. The same also applies, naturally, whenever hydraulic fl uid is added later. Before the hydraulic system is brought up to the system pressure, the entire system has to be vented. Venting of the hydraulic system is performed via suitable ports. The hydraulic cylinders have optional dedicated venting screws. At idle pressure, simply loosen the venting screw and the fi ttings at the bottom and rod ends. This is done by unscrewing the screw by not more than a half turn (image 1). Close them again only when the escaping oil is free of bubbles (image 2). After that, move the system only in the low-pressure range. This process has to be repeated several times in order to guarantee that the hydraulic system is completely free of air and gases. Finally, re-seal all venting screws and fi ttings so that they are pressure-tight. The function of the cylinder can be checked by moving it in and out several times under low pressure. Because under certain circumstances the air dissolved in the hydraulic fl uid can be desorbed, it is advisable to vent the system again when maintenance is performed at the latest. Before the hydraulic system is brought to operating pressure, all components should be checked again for proper installation. 1 2
! 4.6 Adjusting the cushioning For cylinders with non-adjustable cushioning, the cushioning characteristics are determined by the design. In the case of adjustable cushioning, the cross sections of fl ow in the hydraulic cylinder can be adjusted for the specifi c requirements. To do this, turn the adjusting screw as far as it will go, and then back again until the desired cushioning intensity is reached. The adjusting screw of the cushioning in the cylinder should not be screwed out too far (maximum of 1.5 turns), so as to prevent free travel to the end position. The minimum cushioning intensity is reached at this point. 4.7. Proper handling of switches and linear position transducers Tip High pressure inductive proximity switches: If required, hydraulic cylinders from AHP Merkle are equipped with inductive proximity switches that are pressure-tight up to 500 bar (7250 PSI). The switches are protected against polarity reversal and short-circuit as standard. If hydraulic cylinders are ordered with inductive proximity switches, the sensors are mounted and adjusted ready for operation. It is not permitted to tamper with the proximity switches, otherwise all warranties will become void. If such a proximity switch has to be exchanged in the course of maintenance work, it is essential to ensure that it is adjusted properly. To do this, move the piston to the position to be monitored, turn the new proximity switch with its front side carefully to the stop, and then turn it back again 360°. This achieves the required switching distance of 1 mm (0.039 inches) Then lock it using the lock nut. With hydraulic cylinders from AHP Merkle, the standard sensing point is the cylinder end position. It is possible to shift the sensing point up to 5 mm (0.2 inches) before the piston end position. The customer has to specify such special requirements clearly already when the hydraulic cylinder is ordered, because no subsequent adaptations are possible. Operating and maintenance instructions en 89
- Page 42 and 43: ! 38 Montage der Stangendichtung Be
- Page 44 and 45: ! Tipp ! 40 Montage von Führungsb
- Page 46 and 47: 4.5 Montage und Inbetriebnahme von
- Page 48 and 49: 44 Einstellbare induktive Näherung
- Page 50 and 51: 46 8 10 1,51 1,23 10 12 2,36 2,01 1
- Page 52 and 53: STZ 250 40-63 2 80-100 125-200 RZ 5
- Page 55 and 56: ahp informiert. 1 Basic information
- Page 57: 2.7 Centering collar . . . . . . .
- Page 60 and 61: 56 Circular block cylinder (RZ) Cir
- Page 62 and 63: 1.3 General calculations ! 58 Conve
- Page 64 and 65: 60 Buckling strength Proper dimensi
- Page 66 and 67: 1.8 Air in the hydraulic system 62
- Page 68 and 69: 1.11 Effect of external forces ! 64
- Page 70 and 71: 1.14 Application situations for hyd
- 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
- Page 86 and 87: 4 Operating and maintenance instruc
- Page 88 and 89: ! 84 Installing the rod seal If the
- Page 90 and 91: ! Tip ! 86 Installing the guide rin
- Page 94 and 95: 90 Adjustable inductive proximity s
- Page 96 and 97: 5 Cylinder fi nder 92 8 10 10 12 12
- Page 98 and 99: STZ 250 40-63 2 80-100 125-200 RZ 5
- Page 101 and 102: ahp informiert. 1 Notions fondament
- Page 103 and 104: 2.7 Centrage . . . . . . . . . . .
- Page 105 and 106: 1.1 Explications relatives aux diff
- Page 107 and 108: Notions fondamentales concernant le
- Page 109 and 110: ! Info Pour les charges de poussée
- Page 111 and 112: ! 1.4 Pressions dans les vérins hy
- Page 113 and 114: 1.10 Mode d‘action de l‘amortis
- Page 115 and 116: ! Les HFC sont ce que l‘on appell
- Page 117 and 118: ! Info La mise en place de diviseur
- Page 119 and 120: ! Pour obtenir une durée de vie la
- Page 121 and 122: 2.2 Qualité de finition des tiges
- Page 123 and 124: ! Vérin double effet - poussée Il
- Page 125 and 126: ! Info Conclusion Les vérins hydra
- Page 127 and 128: 2.9 Extrémités de tige de piston
- Page 129 and 130: 3 Capteurs et systèmes d‘interro
- Page 131 and 132: 3.3 Capteurs mécaniques Les princi
- Page 133 and 134: ! ! Info Lorsque tous les travaux d
- Page 135 and 136: Info ! Montage du joint de piston L
- Page 137 and 138: 4.4 Obtenir des pièces de rechange
- Page 139 and 140: ! 4.6 Réglage de l‘amortissement
- Page 141 and 142: ! 4.8 Consignes générales de séc
!<br />
4.6 Adjusting the cushioning<br />
For cylinders with non-adjustable cushioning, the cushioning characteristics are determined by the design.<br />
In the case of adjustable cushioning, the cross sections of fl ow in the hydraulic cylinder can be adjusted for<br />
the specifi c requirements. To do this, turn the adjusting screw as far as it will go, and then back again until<br />
the desired cushioning intensity is reached.<br />
The adjusting screw of the cushioning in the cylinder should not be screwed out<br />
too far (maximum of 1.5 turns), so as to prevent free travel to the end position.<br />
The minimum cushioning intensity is reached at this point.<br />
4.7. Proper handling of switches and linear position transducers<br />
Tip<br />
High pressure inductive proximity switches:<br />
If required, hydraulic cylinders from <strong>AHP</strong> <strong>Merkle</strong> are equipped with inductive proximity switches that are<br />
pressure-tight up to 500 bar (7250 PSI). The switches are protected against polarity reversal and short-circuit<br />
as standard.<br />
If hydraulic cylinders are ordered with inductive proximity switches, the sensors are mounted and adjusted<br />
ready for operation. It is not permitted to tamper with the proximity switches, otherwise all warranties will<br />
become void.<br />
If such a proximity switch has to be exchanged in the course of maintenance work, it is essential to ensure<br />
that it is adjusted properly. To do this, move the piston to the position to be monitored, turn the new proximity<br />
switch with its front side carefully to the stop, and then turn it back again 360°. This achieves the required<br />
switching distance of 1 mm (0.039 inches) Then lock it using the lock nut.<br />
With hydraulic cylinders from <strong>AHP</strong> <strong>Merkle</strong>, the standard sensing point is the<br />
cylinder end position. It is possible to shift the sensing point up to 5 mm<br />
(0.2 inches) before the piston end position. The customer has to specify such<br />
special requirements clearly already when the hydraulic cylinder is ordered,<br />
because no subsequent adaptations are possible.<br />
Operating and maintenance instructions en<br />
89
Change language