Double acting hydraulic cylind
發(fā)布時間：2009-09-20 來源：揚子工具集團 瀏覽次數(shù):6476834
B 8354．1992
10．1 Test conditions When the test conditions are not available。these shall be
determined upon agreement between the purchaser and supplier．
10．1．1 0il for tests
32 0r VG 46 0f Class
The oil for the tests shall be the viscosity grade ISO VG
2 specified in JIS K 2213．
10．2 Test methods
The oil temperature shall be 50±5。C．
10．2．1 No load operation test In the no load operation test．set the pressure of
the test circuit to the minimum operating pressure，and carry out running at the
minimum speed of Table l over the total stroke not applying any load to the
cylinder．The speed control of the cylinder shall be the meter．in circuit or bleed．
off circuit which restricts the supply side．
10．2．2 Durability test ’The durability test shall be carried out under the oper-
ating conditions of Table 33．Each part of the sample cylinder shall not be ad-
justed during the test．
As t0，the switch，its electric circuit shall be operated at each sensing of the
piston．
Table 33．Conditions of durability test
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Travelling distance of piston
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500kmmin．
|
|
Speed of piston
|
The maximum speed ofTable l±10％
|
|
Internal pressure of cylinder
|
The oil hydraulic circuit shall be of back pressure
restriction，and the internal pressure of cylinder
at supply side shall be not less than the nominal
woring pressure．
|
|
Load mass
|
It shall be determined in accordance with At．
tached Table l an Attached Fi9.2．
|
Remarks l．The internal pressure of the cylinder shall not exceed the
permissible maximum working pressure during the test．
2．For the cylinder without cushionin9，the running direction
shall be changed over in front of the cylinder—stroke end．
10．2．3，P．．．．．r．．．．e．．．．s．．．．s．．．u．．．．．r．．．．e．．．．．．．r．．．e．．．．．s．．．i．．．s．．．．t．．．a(chǎn)．．．．n．．．．．c．．．．e．．．．．．．t．．．e．．．．s．—t— Carry out the pressure resistance test by
applying a pressure of l．5 times the nominal working pressure to the head end of
the cylinder。and l．5 times the nominal working pressure or l．05 times the maxi-
mum permissible working pressure，whichever is higher，to the rod end for 2 rain
0r more．
VV-hen the pressure is applied to the head end，the test shall be carried out
by fixing the piston at the position where the piston has just reached the rod
cover；when the pressure is applied to the rod end，the test shall be carried out
by fixing the piston at an intermediate position near the stroke end．
35
王：8354．1992
10．2．4—Oil leak—age test The oil leakage test shall be made as describe i below：
(1) External oil leakage While performing the tests specified in l0．：：．l，10．2．2
and l0．2．3，measure the amount of the oil leaking from the wiper I art of the
rod．
(2)—Internal 0—il leakage While performing the test specified in l0．2．：；，apply
the maximum permissible working pressure to one side of the pistc a，and
measure the amount of the oil leaking through the piston to the ul)loaded
pressure side．
10．2．5．T．．．．．e．．．．s．，．．t．．．．．．f．．．o．．．．r．．．．．．t．．．h．．．．．．r．．．u．．．．．s．．．．t．．．．．．e．．．．ffi．．．．．．．．c．．．．i．．e．．．．n．．．．．c．．．y—— Measure the output force at the nomi aal work--
ing pressure of a sample cylinder and calculate the ratio of it to the cyli：1der force
[Refer t0 2．Definitions(8)】．
1 1． Inspection
11．1 Type inspection The type inspection shall be carried out on the c=’linders
of new design or of remodellin9，which are considered as new design one；，for the
items enumerated below．The results shall meet the requirements of 5．·，0 8．
No loa．d operation
Durability
Pressure resistance
External oil leakage
Internal oil leakage
Thrust efficiency
Construction
Dimensions and accuracy
Appearance
Switch
11．2—Delivery i—nspection The delivery inspection shall be carried out 0‘1 the
cylinders of the same type as those which have passed the type inspectioI l and
have been ascertained as to the satisfactory performance，for the items oi(1)，(4)，
(9)and(10)specified in ll．1．The inspection items，however，may be par；ially
omitted，sumect to an agreement between the purchaser and supplier．
12．Designation The cylinder should preferably be designated by using the
number(or the title)of the standard，and names or symbols of materials)f pack．
m9，mounting type，tube bore，rod diameter symbol，nominal working Pre：；sure，
location and with or without cushionin9。stroke length and location of por l．HOW．
ever。as for the ones with the packing and gasket of which materials havf com．
bined seals，indicate the symbols of the rubber materials used．
)))))))))nv
36
B 8354．1992
Example l：
JIS B 8354 R 2 1 LA 40 8 2l N 200 A
Location of port
Location of CUShioning
and with or without
cushioning(none)
Nominal working
pressure
(21 MPa){210 k9∥cm2)
Remarks：When the material ofpiston packing and that of rod packing are the same，
2 instead of 22 may be used．
Example 2：
Double acting hydraulic cylinder SI SI TA l00 C 14 H 320 B
pressure
(14MPa)
13．—M——a—r—k—i—n—一9 The cylinder shall be clearly marked with the particulars
enumerated below or designation．However，those marked with asterisks may be
omitted．
(1) Name
(2)Tube bore
(3) Rod diameter
(4) Nominal working pressure
(5) Cushioning
(6)Length of stroke
(7) Class of external oil leakage宰
＼
(8) Shapes of piston packing and rod packin9木
(9)Type number by manufacturer*
(10)Manufacture number
(1 1)Year and month of manufacture or their abbreviations
(12)Manufacturer’S name or registered trademark
37
B 8354．1992
Exsmple：Double acting hydraulic cylinder-R-21 LA 40 8 21 N 200 A
Manufacture number or year and month of manufacture l992-4
1堪anufacturer‘S name or re西stered trademark JISC
Attached Table l．Piston speeds to be used in durability test
The piston speeds to be used in the durability test(at an actual discharg of an
oil hydraulic pump as l00 2／rain)shall be as follows：
|
Tube bore
|
Test piston speed±10％
|
Remarks
|
|
32
40
50
63
|
400
|
The maximum speed has been
restricted t0 400 mm／s．
|
|
80
|
300
|
|
|
i00
|
200
|
|
|
125
|
130
|
|
|
140
|
100
|
|
|
160
|
80
|
|
|
180
|
60
|
|
|
200
|
50
|
|
|
220
|
40
|
|
|
250
|
30
|
Informative reference：Motor capacity of pump unit for test
Approx．50 kW when 210 MPa(203．9 kgf／cm2}
Approx．30 kW when l40 MPa(142．8 kgf／cms}
Approx．15 kW when 70 MPa(71．4 kgf／cm2}
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