Sharp 32L-X2000 Manual de Instruções descarregar pdf (Página 72)

9) WIRE ROPE SPECIFICATION TIRAK

There seems to be some question as to selection of wire rope due to the many people offering wire rope today

Before Tractel chooses a supplier of wire rope we run an endurance test or cycle test to make certain that the rope func-

tions well in the hoist and has good life. The European norms require 1000 cycles minimum, UL testing requires 500

cycles. We require 2000 cycles and test with a high-speed hoist 60 ft./ min. to give a more severe dynamic load to the

wire rope during starts and stops. After 2000 cycles we allow a certain number of broken wires ( not strands ) in a given

length of rope. Too many breaks are a test failure. We have no idea how or if other rope suppliers test a rope with our

hoist. We generally do not test other peoples ropes because it is time consuming and expensive to conduct. We would

be inundated with samples.

5 X 19 vs. 5 X 26 Construction 5 strands of 26 wires have smaller wires making up the strands. This provides greater

flexibility but smaller outside wires wear out faster during normal use. Smaller wires are less resistant to abrasion.

Therefore we primarily recommend 5 X 19. PI equipment often uses 5 X 26 because winders are part of the system and

it coils better.

Quality of Manufacture- If a good control is not made on the tension during manufacture, then a loose strand can

occur. This shows when lowering a load. It can cause a jam. Preforming requires that tension be monitored. To get a

high quality rope requires that high quality wires be used creating very tight tolerances. A poor zinc plating process can

cause slippage. Ropes must be lubricated properly or the friction coefficient is poor between the wire rope and the

sheave.There should not be a change in the diameter of the wire rope when worn.

Summary- There is much more to wire rope selection than number of strands and number of wires. Tractel supplies

only high quality and rigorously tested wire rope from a very few carefully selected and monitored manufacturers.

9-1 Wire Rope Specifications - XE301P (Page 1 of 2)

Table 1001

1st Choice 2nd Choice

Hoist Types: Tirak Tirak

Construction: 5 x 19 5 x 26

Strands 5 5

Wires per strand 19 26

Core Type Polypropylene splitfilm same

Type Warrington Seale same

Diameter:

8.4 mm +0 -0.3mm{8.1 - 8.4 mm} 5/16" approx.

{0.319 - 0.326” }

same

Minimum Breaking Load: 10,000 lbs. [4590 kg] same

Material of Construction: Galvanized Steel wire rope XIPS 200/220 n/ sq. mm same

Rope Lay: Right hand Regular Lay same

Lubrication: Core Lubricated same

Preformed: Yes same

1 2 ... 67 68 69 70 71 72 73 74 75 76 77

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