How to calculate the breaking force of wire rope
F0 = k '* D2 * R0 / 1000
where
F0 is the minimum breaking force of wire rope, in kn
d nominal diameter of wire rope, in mm
R0 nominal tensile strength of wire rope, unit: MPa
k 'the minimum breaking force coefficient of a certain type of wire rope
in the conventional engineering construction, the most commonly used is 6 × 19 and 6 × Steel wire rope of 37 structure. six × 19 is relatively hard and the monofilament is relatively thick. It is generally used as wave wind rope and stay wire; six × 37 is relatively soft, and the monofilament is relatively thin. It is generally used for grinding rope and hoist rope, and needs to pass through the parts with large bending angle of pulley
For example, calculate 6 × 37 the minimum breaking force of fiber core wire rope with nominal diameter of 18mm and tensile strength of 1770mpa{rrrrrrr}
extended data:
steel wire rope is a standard proct in various instrial countries. Its diameter, number of strands, number of steel wires per share, tensile strength and sufficient safety factor can be selected according to the needs of application. Its specifications and models can be found in relevant manuals
in addition to the wear of the outer steel wire, the steel wire rope is graally broken e to metal fatigue caused by repeated bending when bypassing the pulley and drum. Therefore, the ratio of pulley or drum to the diameter of the steel wire rope is an important factor determining the service life of the steel wire rope. The ratio is large, the bending stress of steel wire is small, the service life is long, but the mechanism is huge
The appropriate ratio must be determined according to the application situation. The wire rope shall be scrapped when the wear and corrosion degree of the surface layer or the number of broken wires in each screw pitch exceeds the specified valuethe steel wire rope is mainly used in the transportation of high strength wire rope, such as lifting and pulling
scrap standard of wire rope sling:
in case of one of the following situations, the wire rope sling shall be stopped using, repaired or scrapped:
1, the wire rope is broken by one strand, or the surface steel wire abrasion reaches more than 40% of the wire diameter, or the wire rope diameter is reced by more than 7%
2
3. The broken wire of wire rope in a lay distance exceeds the standard (Table 9): (1) when the broken wire phenomenon occurs locally, and the broken wire occurs on one strand in a section of 6 times the diameter, it shall be scrapped when it reaches half of the specified number of broken wires 2) When the wire rope is corroded or worn, the number of discarded broken wires shall be multiplied by the rection factor (Table 9)
4. Broken wires were found in some parts of the wire rope (more than three broken wires gathered together)
5. The broken wires appeared on the surface of the eyelet, or the broken wires were concentrated in the metal sleeve, near the joint and in the joint strand
6. The strength of the wire rope decreases e to the burning of the wire rope, the immersion of molten metal, or the long-term exposure to high temperature
7. The socket was severely squeezed and worn; The metal casing is damaged (such as crack, serious deformation, corrosion) or the diameter is reced to 95% of the original diameter
8. The metal sleeve or plug-in part of the rope end fixed connection slipped out
24x24x50 / 1000 = 28.8t
we need to calculate the safety factor in actual work, so we need to divide it by safety factor 4 ~ 6
24x24x50 / 1000 = 28.8t, for example, divide it by 528.8t/5 = 5.76t
the higher the number of safety ties, the less the lifting
these terms:
A) breaking strength (also known as complete English calculation of breaking load of wire rope: Calculation of breaking load, CBL for short)
it is defined as: the tensile strength of wire rope of theoretical wire rope, and the corresponding metal cross-sectional area? Breaking force of steel wire< br />
Σ{ Metal cross section area? (wire) x (tensile strength of steel wire)} = (total breaking strength)
note: e to specific changes in the structure of the rope and wire, the tensile strength of the rope and wire is within a certain range, which can be two different strength tolerances, as well as the wires of different strength selected by the worker ring design. So, where is the cross-sectional area of the cross-sectional area? Filament, tensile strength of each wire. The total breaking force of the wire rope is the sum of all wires of the breaking force of the wire rope
it is not recommended to use the method of (nominal diameter of wire rope) x (nominal tensile strength of wire rope) to calculate the total breaking force
b). English: minminum breaking load (MBL)
it is defined as the sum of the breaking forces of the wire rope multiplied by the twist factor (also known as the minimum breaking force factor) of the wire rope structure
(total breaking force of steel wire rope) x (compiled twist factor) = (minimum breaking force of steel wire rope)
note: planned twist factor is a rope structure, and the coefficient from the combination of experience and theory is artificially specified, which will change in different periods. Manufacturers often use different values
corresponding to different structures of wire ropes, or procts of different periods, or different plants, or even the total breaking strength, the minimum breaking force of wire ropes is very different< It is defined as the result of the whole rope breaking test on the wire rope tensile testing machine of the real sample
conclusion: three values of breaking force of wire rope: A & gt; C> B
24x24x50 / 1000 = 28.8t
we need to calculate the safety factor in actual work, so we need to divide it by safety factor 4 ~ 6
24x24x50 / 1000 = 28.8t, for example, divide it by 528.8t/5 = 5.76t
the higher the safety factor is, the less lifting is
commonly used steel wire ropes include phosphating coated steel wire rope, galvanized steel wire rope, stainless steel wire rope or plastic coated steel wire rope, which are used in atmospheric environment. The service life of manganese phosphating coated steel wire rope proced by patented technology is the longest, and the fatigue life of phosphating coated steel wire rope is 3-4 times of that of smooth steel wire rope, up to 5 times, There is also the possibility of further improvement. The average daily cost of phosphating coated steel wire rope is only about 30% of that of smooth steel wire rope. Phosphating coated steel wire rope is the upgrading proct of smooth steel wire rope, which is only for reference.
diameter of wire rope x diameter of wire rope x 50 ÷ 1000 = T
usually, we have to divide it by 4-8 times of safety factor
the formula of breaking force of wire rope is:
F0 = k '* d ^ 2 * R0 / 1000
where
F0: the minimum breaking force of wire rope, in kn
D: nominal diameter of wire rope, in mm
R0: nominal tensile strength of wire rope, unit: MPa
k ′: the minimum breaking force coefficient of a certain type of wire rope
approximate formula of breaking force of wire rope:
breaking force ≈ 50 × diameter × Diameter
where the breaking force is in kg and the diameter is in mm
where
F0 is the minimum breaking force of wire rope, in kn
d nominal diameter of wire rope, in mm
nominal tensile strength of R0 wire rope, in MPa
k 'is the minimum breaking force coefficient of a certain type of wire rope
in the conventional engineering construction, the most commonly used is 6 × 19 and 6 × Steel wire rope of 37 structure. six × 19 is relatively hard and the monofilament is relatively thick. It is generally used as wave wind rope and stay wire; six × 37 is relatively soft, and the monofilament is relatively thin. It is generally used for grinding rope and hoist rope, and needs to pass through the parts with large bending angle of pulley
for example, calculate 6 × 37 the minimum breaking force of fiber core wire rope with nominal diameter of 18mm and tensile strength of 1770mpa
extended information:
steel wire rope is a standard proct in various instrial countries. The diameter, number of strands, number of steel wires per share, tensile strength and sufficient safety factor of steel wire rope can be selected according to the needs of application. Its specifications and models can be found in relevant manuals
in addition to the wear of the outer steel wire, the steel wire rope is graally broken e to metal fatigue caused by repeated bending when bypassing the pulley and drum. Therefore, the ratio of the diameter of the pulley or drum to the diameter of the steel wire rope is an important factor determining the service life of the steel wire rope. The ratio is large, the bending stress of steel wire is small, the service life is long, but the mechanism is huge.
commonly used wire ropes include phosphating coated wire rope, galvanized wire rope, stainless steel wire rope or plastic coated wire rope. In atmospheric environment, the service life of manganese phosphating coating steel wire rope proced by patented technology is the longest. Manganese phosphating coating can greatly improve the wear resistance and corrosion resistance of steel wire rope surface. The fatigue life of phosphating coating steel wire rope is 3-4 times that of smooth steel wire rope. With the study of wear-resistant phosphating solution, it is possible to further improve it. According to the current market price of phosphating coated steel wire rope, the average daily cost of phosphating coated steel wire rope is only about 30% of that of smooth steel wire rope. Phosphating coated steel wire rope is the upgrade proct of smooth steel wire rope, which is only for reference.
24x24x50 / 1000 = 28.8t
we need to calculate the safety factor in actual work, so we need to divide it by safety factor 4 ~ 6
24x24x50 / 1000 = 28.8t, for example, divide it by 528.8t/5 = 5.76t
the higher the safety factor is, the less lifting is