JB/T 11963-2014 English PDF (JBT11963-2014)

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JB/T 11963-2014: Air hoists
JB/T 11963-2014
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 53.020.99
J 80
Filing No.: 45922-2014
Air hoists
气动葫芦
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Type and basic parameters ... 6
4.1 Type ... 6
4.2 Basic parameters ... 9
5 Technical requirements ... 11
5.1 Working environment conditions ... 11
5.2 Basic requirements ... 11
5.3 Use performance ... 11
5.4 Safety and hygiene ... 13
5.5 Main components ... 14
5.6 Surface coating and appearance ... 15
5.7 Life of lifting mechanism ... 15
5.8 Explosion-proof performance ... 16
6 Test methods ... 17
6.1 Test conditions ... 17
6.2 Test method ... 18
7 Inspection rules ... 28
7.1 Inspection classification ... 28
7.2 Exit-factory inspection ... 28
7.3 Type inspection ... 28
7.4 Life test ... 29
8 Marking, packaging, transportation, storage ... 29
8.1 Marking... 29
8.2 Packaging ... 30
8.3 Transportation and storage ... 30
Appendix A (Normative) The cycle, operation time, test load, total use time of different
working levels of lifting mechanisms ... 31
Air hoists
1 Scope
This standard specifies the terms and definitions, types and basic parameters, technical
requirements, test method, inspection rules, marking, packaging, transportation and
storage of air hoists.
This standard applies to air hoists used in general environments, explosive gas
environments, explosive dust environments. Air hoists used in other special
environments can make reference to this document.
2 Normative references
The following documents are essential for the application of this document. For all
referenced documents with dates, only the versions with dates apply to this document.
For all undated referenced documents, the latest versions (including all amendments)
apply to this document.
GB/T 783 Lifting appliances - Range of maximum capacities for basic models
GB/T 3811 Design rules for cranes
GB 3836.1-2010 Explosive atmospheres - Part 1: Equipment - General requirements
GB/T 4205 Basic and safety principles for man-machine interface (MMI), marking
and identification - Actuating principles
GB/T 5972 Cranes - Wire ropes - Care, maintenance, installation, examination and
discard
GB 6067.1 Safety rules for lifting appliances - Part 1: General
GB/T 7932 Pneumatic fluid power - General rules relating to systems
GB 8918 Steel wire ropes for important purpose
GB/T 9286 Paints and varnishes - Cross cut test for films
GB/T 10051.1 Lifting hooks - Part 1: Mechanical properties, lifting capacities,
stresses and materials
GB/T 13306 Plates
5.3.2 When the air hoist is subjected to a static load test, it shall be able to withstand a
test load of 1.25 times the rated lifting capacity. After the test, a visual inspection is
carried out. The metal structural parts that bear the force shall be free of cracks,
permanent deformation, paint peeling, or damage that affects the performance and
safety of the air hoist. The joints shall also be free of looseness or damage; there shall
be no oil leakage.
5.3.3 When the air hoist is subjected to the dynamic load test, it shall be able to
withstand a test load of 1.1 times the rated lifting capacity. During the test, each
component shall be able to complete its functional test; the brake and other safety
devices shall operate sensitively and reliably. After the test, a visual inspection shall be
carried out, to ensure that each mechanism or structural component is free of damage,
each connection is free of looseness or damage, meanwhile there shall be no oil leakage.
5.3.4 When the hook is lowered and there is no other external force acting on the wire
rope, the wire rope can still be discharged freely from the rope outlet of the rope guide;
when the rated load is lifted and lowered, the angle of the wire rope centerline deviating
from the centerline of the spiral tip by no more than 3.5° on both sides shall be able to
work normally.
5.3.5 Air hoists with running mechanisms shall be able to meet the following
performance requirements under rated air pressure and rated load:
a) There shall be no abnormal phenomenon during the operation process;
b) There shall be no abnormal phenomenon in the 1/200 climbing test;
c) The allowable deviation of the operating speed shall be ±15% of the nominal value
(slow speed is not tested).
5.3.6 Under rated load, when the lifting speed is less than or equal to 0.5 m/min, the
lifting mechanism’s braking slippage shall not be greater than 5 mm; when the lifting
speed is greater than 0.5 m/min, the lifting mechanism’s braking slippage shall not be
greater than v/100 (v is the stable lifting distance within 1 min under rated air pressure
and rated load); meanwhile it shall not be greater than 200 mm.
5.3.7 Under the condition that the rated load and the air pressure deviation of the air
motor inlet are ±10%, the air hoist shall work normally.
5.3.8 The lifting height shall not be less than the nominal value.
5.3.9 The minimum hook spacing shall not be greater than the nominal value.
5.3.10 Under rated air pressure and rated lifting weight, the allowable deviation of the
lifting speed shall be ±10% of the nominal value; the allowable deviation of the
lowering speed shall be -10% ~ 25% of the nominal value (slow speed is not tested).
5.4 Safety and hygiene
5.4.1 For air hoists with a rated lifting capacity of 1 t ~ 10 t, the lifting mechanism shall
be equipped with a safety clutch; for air hoists with a rated lifting capacity greater than
10 t, the lifting mechanism shall be equipped with a safety clutch or the air hoist body
shall be limited in air pressure to prevent overloading. The load limit value shall be
within the range of 1.1 ~ 1.3 times the rated lifting capacity.
5.4.2 Air chain hoists shall be equipped with chain guides, to ensure that the lifting
chain is smoothly engaged with the lifting sprocket and loose pulley, that the lifting
chain does not get stuck, climb, or have other abnormal conditions. A limiting device
shall be set at the end of the lifting chain, that is not under stress, to prevent the lifting
chain from overwinding and detaching from the lifting sprocket.
5.4.3 For air hoists with single-layer winding wire ropes, rope guides shall be set or
other measures shall be taken to prevent rope tangling.
5.4.4 When the hook is lowered to the lower limit position, the number of safety turns
of the wire rope on the drum shall be no less than two turns (excluding the number of
turns for fixing the rope tail). Under this safety winding, the rope end fixing device shall
not deform to cause looseness, when it is subjected to 2.5 times the maximum working
static tension of the wire rope.
5.4.5 The air hoist shall have a stroke limiting function. When the hook rises or falls to
the limit position or the set position, the movement of the hook in the original direction
shall be automatically stopped; however, the movement of the hook in the opposite
direction shall not be affected.
5.4.6 Where there are more than two air hoists on the same track, anti-collision buffer
devices shall be installed between the air hoists.
5.4.7 The operating mechanism shall run smoothly without abnormal noise.
5.4.8 Air hoists shall be ...