Method for controlling length accuracy of lifting belt

As we all know, there are many specifications of synthetic fiber hoisting belts, including flat color hoisting belts, flexible round hoisting belts, etc. In addition, in the production process of lifting belt, the length control of the lifting belt is one of the important factors in the lifting belt specifications, especially in some important large-scale lifting operations, length accuracy is crucial, which directly affects the success or failure of lifting.

With the vigorous development of the national economy and various industries, the synthetic fiber hoisting belt industry is also changing with each passing day. Synthetic fiber hoisting belts, especially circular hoisting belts, are increasingly widely used. Synthetic fiber hoisting belts have the advantages of light weight, easy to use, stable lifting, safety, corrosion resistance, and wear resistance. The application of synthetic fibers improves labor efficiency and saves costs. However, users from all walks of life are gradually demanding higher and higher requirements for the length accuracy of the hoisting belt.

How to control the accuracy of the length of the hoisting belt? This is a technical method involving the production of lifting belts. 50% of people do not know the details inside. In this article, the author of the lifting belt manufacturer Hebei Dongsheng Sling Rigging will give you a professional explanation of the precision control method of lifting belt length. The specific steps are as follows:

1. Control the length of the sub-cord

(1) Set parameters:

Rated tension of lifting belt: F

Pre-stretching tension of sub-cord: F1

Pre-stretching tension of fiber rope: F2

Number of sub-score roots: X

Number of fiber rope loops in sub-cord: Q

Effective length of lifting belt: L

Carrier core diameter: D

Where, F1 = F/X; F2 = F/XQ;

(2) Pre-stretch the fiber rope by F2 tension, measure the length L+D, and mark it. In this way, measure 2Q length L+D on the same fiber rope in sequence, and turn the Q ring around, and plug the joint into a closed ring to form a sub-cord. Multiple sub-cords are made according to this method.

2. Control the length of the bearing core

(1) Perform a tensile test of F1 load on each sub-cord, and record the length of each sub-cord separately, and mark and number according to the length of the sub-cord;

(2) Make a bearing core according to the length of the sub-cord, and then perform a rated tensile pre-tension test to measure and record the length value;

(3) Make a lifting belt with an external protective sleeve for the bearing core, and then perform a tensile test of the rated load to measure and record the length value as the final length value of the lifting belt under the rated load state.

The advantages of this control method are that the length error of the hoist belt made by this method is not greater than ±0.2%, and the error range stipulates that the domestic and foreign hoist belt standards are ±2%. The relative length error in the loading state between the multiple hoisting belts made according to this method is not greater than 0.04%.

Do you understand the length control method of lifting belt?

What will happen if the lifting loses its square inch? Be safe, choose Dongsheng!



Track Bolts

Track Bolts are used for splice bar connections and we can supply a range of fish bolts manufactured to international standards according to BS, ASTM and DIN, among Others.
Listed below are examples of some of our fish bolt manufactured over the last several years as per BS 20M, 30M, 35M, 35R, 50 O, 60A, 75R, 80R, 80A, 95RBH, and 113A; DIN S10, S14, S18, S20, S24, S30, S49, UIC54, UIC60; and AREMA

40ASCE, 60ASCE, 75ASCE, 90ARA, 115RE.

1. This fish bolt is manufactured as per ASTMA-183. Track bolts come with heavy Square Nuts and Grade 2 heat treatment, with oval neck and diamond neck.

Tensile Strength
Yield Strength Elongation

828Mpa (min) 635Mpa (min) 14%(min)

2. We produce the fish plate bolt as per AS1085.4-1999. The nominal thread diameter isM20/M22/M24 and the thread of the fish bolts are finished square. A nominal 45 degree chamfer is to be provided to a depth slightly exceeding the depth of the thread, nut shall be in accordance with AS/NZS 1252.

  • Tensile Strength

    Yield Strength

    Elongation

    800Mpa

    640Mpa

    12%

    C

    Mn

    P

    0.55(max)

    0.25(min)

    0.04(max)

    Material: Q235 and 45#
    Grade: 8.8
    Surface: Plain, black painting
    MOQ: 5000PCS
    Packing: Plastic bags and wooden pallets or according to clients' requirement

    Chemical composition and mechanical properties are shown below.


3. We produce the fish bolts according the BS standard. These fish bolts can be manufactured to mild steel or high tensile steel Grade 8.8 as well as the latest Transnet specifications. Metric and imperial sizes are available and are used for fish plate of BS50, BS60R, BS70A, BS75A, BS75R, BS80A, BS80R, BS90A, BS90R, BS95A, BS95R, and BS95N.
Adhering to our quality first policy, SUYU pays great attention to quality control management on fish plate. We have been granted ISO9001-2008 certificates and have received the production license of China's Railway Ministry on railway products. We have a full set of inspection instruments to ensure all our fish bolt products are of high quality and up to customers' requirements.
As a leading manufacturer of rail fastening based in China, SUYU also produces many other railway fasteners, such as track spike, sleeper screw, rail anchor, rail joint bar, tie plate, rail clip, elastic rail clip, SKL tension clamp, rail shoulder, and so on.


Track Bolts,Round Track Bolts,Oval Track Neck Bolt,Stainless Steel Track Bolts

Ningbo Brightfast Machinery Industry Trade Co.,Ltd , https://www.brightfastener.com

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