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| A brief introducton to eng ineering plastic cable drag chains |
Characterstics and Applications of Drag Chains:
¡ôThe product can be used for such locations where repciprocating motions are required sothatinternallyinstalled cables.oil pipes,gas tubes and water tubes can be draged and protected.
¡ô Eachjoint ofthe chain Can be opened up so astofacilitate repairs and maintenance It gives low noises and is of anti-wearing while running.It can also be operated under high speed.
¡ô The drag chains have already extensively used in digital-controlled machine tooIs£¬eIectronic epuipement£¬machinery for stone industry£¬machinerfor glass industry£¬machinery for doors and windows,moulding injectors,manipulators,lifting and transport equipment and automatic warehouses,etc.
Construction of the drag chains:
¡ô The appearance of the chain looks Iike the crawler of a tank consisting of certain mumber of Joints. The Jo]nts of crawlerare freely turned round.
¡ô The same series of chain has same inner height and out height and same pitch but the inner height and bend radius R can be made per different specifications.
¡ô A unit chain loint is consisting of aleft right chain plate and a updown cover. Each chainjointcan be opened up soastofacilitate assembly and dismantal without threading. Cables£¬oil pipes and gas pipes can be put into the drag chain after the cover plate is opened.
¡ô Spacers are available for use, which are able to divide the space inside the chain into divisions according to requirements.
Basic parameters of drag chains:
¡ô Material:reinforced nylon It can stand with high pressure and has
good tensile strength,toughness and elasticity,wearing and
falmable resistance.
¡ô Resistances:It is oil and salt resistant.
¡ô Operating speed and acceleration:Max operating speed is 5m/sec .and max. acceeleration is 5m/sec.(specfic speed and
acceleration depends on specific situation).
¡ô Service life:Under normal conditions, 5 million reciprocating
motions can be reached(which is also related to the operating
conditions.) |
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| Technical data: |
| Tensile strength |
180N/mm2 |
Volume resistance |
1010~1015 |
| Impact strength |
50KJ/m2 |
Water Absorption £¨23¡æ£© |
4% |
| Temperature |
-40¡æ¡«130¡æ |
Friction factor |
0.3 |
| Surface resistance |
1010¡«1012¦¸ |
Falme resistance |
HB(UL94) |
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| Operating Mode of chain: |
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H=Installed height
T=Pitch
Ha=Outside height
FL=Suspended ienght
P=Deviation from center at the fixed end
S=Travel range
R=Bending radius
When the fixed point being located at the middle point of the travel range(P=0),the length of drag chain will be optimized. |
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| Caculations for chail's length and installation height: |
Chain's length L=S/2+pR+P+£¨2¡«3£©T
Drag chain' installation heigth H=2R+Ha+0.1Ha
Please ask by telephone or fox about the length and installation of the drag chain in coast operation. |
Principle for selecting drag chains:
¡ô Inner height:Take the most thick piece of the internally installed
cable,oil pipe,gas pipe or water pipe as the reference height plus
10£¥ of the space height at least as the inner height Hi.lf overlapping,take the ovedapped height as the actual height.
¡ô lnner width:Take the sum of the outside diameter of the thicker
cables,oil pipes,gas pipes or water pipes as the reference of the
inner width and leave at least 10£¥of the space as a margin.
¡ô Radius of a bend:Take the biggest radius of a bend of a cable,oil
pipe,gas pipe orwater pipe as a reference value andleavel0£¥
of the spaceas a margin.
¡ô Installation principles for internally laid cable,oil pipe water pipe
or gas pipe£º
¡ô 15£¥of the space should be reserved as a margin so that the
internalty laid cables and oil pipes can move freely and there will
not be any stress on the drag chains in the direction of radius.
¡ô For those cables that are quite different in diameter, they shoud
be laid separately and the weight should be balanced evenly.
They can also be separated from one another by using spacers if
necessary.
¡ô When operating in high speed or high frequency the horizontally
laidcables should be in a parted way and should notbe overlapped
If too many cables,gas pipes and oil pipes laid together,Jt is
recommended that spacers be used.
Installation for cable drag chains:
¡ô Put a screw driver vertically into the opening hole at both ends of
the cover and then open the cover. Put the drag chain for cables
and oip pipes according to the instructions provided. Putthe cover
back Note that the fixed end and the moving end ofacable should
be fixed by using a tension device.
¡ôWhen used in a long sliding service, it is recommedned to use a
guiding grove. Please ask our technical personnel about the
usage of the guiding grove. |
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