SMW Autoblok SIN-S Serie Manual De Instalación, Uso Y Mantenimiento página 9

SIN- CYLINDERS USE AND MAINTENANCE INSTRUCTION
3. CYLINDER CONNECTION WITH THE DRAINING AND FEEDING
HOSES.
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3.1 All feeding and draining hoses must be flexible. Avoid using any
rigid or semirigid tube which could exercise an axial pressure on the
collector and damage the bearings.
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3.2 Only use connectors with parallel threads and suitable seal wa-
sher. NEVER USE CONNECTOS WITH TAPERED THREADS.
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3.3 The oil manifold (the non rotating part of the hydraulic cylinder) must
be kept in position by using a bracket anchored on the machine. The bra-
cket must not exert axial force and must have a 2-3mm radial clearance.
3.4 IMPORTANT
The oil seal between the fixed manifold and the rotating part of the
cylinder is made by means of rotating rubber seals; this allows SIN-
cylinders to be used for vertical applications.
As the oil drain is not made by gravity, there must not be a difference
in heght between the drain fitting and the oil level in the hydraulic
power unit, but when so is possible is preferable, in order to guarantee
to the cylinder better working temperatures.
4. HYDRALIC POWER UNIT AND RECOMMENDED OILS.
4.1 The unit's tank capacity must be at least 4 times the nominal output
of the pump measured in litres/min. (eg; with a 12 l/min pump the
power unit tank must have a capacity of at least 45-50 litres). Should
this be impossible, we recommend using oilcooling systems. The best
operating temperature for hydraulic rotating cylinders is between 35°
and 60° C (even 70° C will not cause any problem).
4.2 The hydraulic system must have an aspiration filter with links of 50-60
µ and a 10 µ feeding filter (we suggest to use filter efficiency control
systems). The delivery filter must be replaced every 6-8 months.
4.3 SIN- cylinders have large oil feeding holes; in order to take advanta-
ge of this and achieve good piston speed, the pump of the hydraulic
power unit must have adequate delivery capacity. The feeding circuit
must have the shortest pipes possible, without constrictions and the
electrovalves must have a large cross section for the oil flow.
4.4 RECOMMENDED OILS
The oil to be used with hydraulic rotating cylinders is specified in the
ISO 3448 type HM 32 regulation. For example:
– SHELL - TELLUS 32 / AGIP OSO 32 – ESSO NUTO H32 (or TE-
RESSO 32) / MOBIL DTE 24 (or DTE light).
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NOTE: We do not recommend using higher density oils be-
cause they could create serious problems in the cylinder's rota-
tion at high speeds and with cold oil.
5. PRECAUTIONS:
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5.1 Before connecting the cylinder to the machine hydraulics, en-
sure there is no foreign matter and metal parts circulating in the sy-
stem. Link the two feeding tubes directly and allow the oil to circulate
for about 30 minutes at maximum pressure so that it is completely
filtered. Then clean the filters.
5.2 During the stroke control system mounting and setting, the operator
must take care that the movement can cause the pinching of the fin-
gers and the hands in the space between the axially moving stroke
control disk and the fixed cylinder main part (see fig.5).
5.3 The piston axial position is detected by means of 2 proximity switches
located in the rear part of the cylinder. One proximity will be used to
give the confirmation of the clamped workpiece and the second for the
jaw fully open position. The optimal radial distance between the switch
and the stroke control disk is 2 mm (see fig.6). If optional stroke con-
trol systems (type PXP or LPS-X) were purchased, follow the specific
instructions written in the instruction manual supplied with the stroke
control kit purchased.
5.4 Before operating the chucking system, operated by a cylinder, carry
out the following tests:
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A) Open and close the chuck at low pressure checking that the
cylinder moves properly without hindrance and that there are no leaks.
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B) Rotate the chuck at low speed, checking that the delivery pipes,
drain tubes or the anti rotation bracket do not hamper this movement.
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C) Bring the pressure to operating level and make another 8-10
movements.
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D) Gradually increase the rotation speed and check that the feeding
oil has a minimum temperature of 35° C before attaining the max speed.
5.5 IMPORTANT
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A) Never allow the cylinder to rotate without oil pressure.
This will damage the bearings, cause seizure of the distribution ring
and the body.
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B) Never rotate the cylinder at high speed with cold oil; this could
damage the bearings and the manifold ring. We recommend making a
few movements (opening/closing) at a low speed before starting.
Fig. 5
Fig. 6
6. ANALYSIS OF THE RISKS AND SAFETY STANDARDS.
6.1 DIRECT RISKS.
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The SIN- cylinders consit of two parts: one is fixed and one rota-
tes at high speed. As a consequence, there is the possibility of a seizu-
re between the two parts in case of non-compliance with the correct
installation and maintenance instructions.
A) Installation
a1. Carefully read and follow the instructions of pos. 3 - 4 and 5 of this
manual. Special care must be given to paragraph 5.
a2. Carefully read the "guide to the solution of the problem", pos. 1 - 7.
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a3. Caution. when the cylinder is rotated for the first time,
be careful that ALL PERSONNEL STAND WELL CLEAR OF THE
CYLINDER.
B) Use and maintenance
To avoid a seizure during the operation, carefully follow the instruc-
tions of paragraph 5 of this manual.
6.2 INDIRECT RISKS.
Indirect risks are the risks that can derive from improper working or
driving of the SIN- cylinder, when clamping components with power
chucks or collets.
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A) The machine must be allowed to rotate only under the
following conditions:
a1. After having checked with a pressure gauge that the feeding circuit
has reached the requested pressure.
a2. After the proximity swithces (2 pcs or more) have confirmed the posi-
tion of "component clamped".
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B) The electric and hydraulic circuits of the machine MUST
GUARANTEE THAT THE COMPONENT CANNOT MOVE DURING THE
SPINDLE ROTATION (safety agaist an accidental opening / closing of
the workholding system).
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C) It is necessary to use double-solenoid valves with detented posi-
tions, TO ENSURE THAT THE POSITION IS KEPT IN THE CASE OF
LACK OF CURRENT (to prevent the opening of the jaws of the chuck).
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D) Inspection of the safety valves of the cylinder.
After commencing to use the cylinder, it is recommended to check
the efficiency of the safety valves at intervals of 1 year. To make this
inspection it is necessary to mount 2 gauges (not supplied) on the drain
holes A and B (see page 28-29-30) by means of suitable fittings. Bring
the pressure to about 30 bar, alternating in the two chambers of the
cylinder, to check that, when cutting off the feed, the pressure in the
chamber does not drop below 10 bar., for at least 4 - 5 minutes.
LEGEND
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Damage risk to the cylinder and/or chuck and/or machine.
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Besides damage to the cylinder and the machinary, RISK OF
PHYSICAL DAMAGE TO THE OPERATORS.
PINCHING AND
BAD INJURIES
DANGER!
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