This standard specifies the terminology, technical requirements, test methods, inspection, marking, use, inspection, scrapping, transportation and storage technical conditions for wire rope slings used in port loading and unloading. This standard applies to wire rope slings connecting port handling machinery and cargo. GB 14738-1993 Technical conditions for use of wire rope slings for port loading and unloading GB14738-1993 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Technical conditions for the use of wire rope slings used in port cargo handling1Specifications for the operation of wire ropeslings used in the port cargo handling1Subject content and scope of application
GB14738—93
This standard specifies the terminology, technical requirements, test methods, inspection, marking, use, inspection, scrapping, transportation and storage technical conditions for wire rope slings used in port loading and unloading.
This standard applies to wire rope slings connecting port loading and unloading machinery and cargo. 2 Reference standards
Round strand wire rope
GB1102www.bzxz.net
GB5974.1 Ordinary collar for steel wire rope
2 Heavy-duty collar for steel wire rope
GB5974.2| |tt||GB6067
Safety regulations for lifting machinery
GB6946
Wire rope aluminum alloy pressed joints
: Wire rope breaking tensile test method
GB8358| | tt | |tt||3.1 Wire rope sling: A loading and unloading sling formed by connecting one or both ends of a steel wire rope to metal accessories such as hooks, rings, chains, etc. It can also be made into a separate sling.
3.2 Ring eye: The ring-shaped part made from one or both ends of the wire rope. 3.3 Plug-in: One or both ends of the steel wire rope are manually or mechanically inserted into a ring eye. 3.4 Crimping: One or both ends of the steel wire rope are mechanically pressed into a ring eye with an aluminum alloy or iron alloy sleeve. 3.5 Flower: In the plug-in process, one cone of wire rope plug is called a flower. 3.6 Single flower: The inserted wire rope is inserted at intervals of one strand. 3.7
The double-spread pair of inserted wire ropes is inserted at intervals of two strands. 3.8 Single-limb wire rope sling: Only one wire rope sling is used to lift goods. This wire rope sling is called a single-limb wire rope sling. 3.9 Multi-limb wire rope sling: Two, three or four wire rope slings connected to the main ring are used to lift the cargo at the same time. This wire rope sling is called a multi-limb wire rope sling.
3.10 Inter-limb angle: In a multi-limb wire rope sling, the angle between two wire rope slings relative to a certain lifting mode. 3.11 Hoisting mode: The geometric position of the wire rope sling when suspending goods. 3.12
2 Lifting mode coefficient (M): Based on the number of sling limbs and the angle between the limbs in the lifting mode, the correction value of the maximum load that the wire rope sling can withstand.
The State Bureau of Technical Supervision approved the implementation on 1994-08-01 on December 10, 1994
GB14738-93
3.13 Rated load (Q): the maximum working load of a single-limb wire rope sling. 3.14 Ultimate working load (Q): The maximum load allowed to be suspended by a wire rope sling under general conditions of use. 3.15 Breaking tension of wire rope sling (F.): The tensile force when the wire rope sling breaks under static tensile test conditions. 3.16 Efficiency coefficient (c): The ratio of the breaking tension of the steel wire rope sling during the tensile test to the minimum breaking tension of the selected steel wire rope. 4Technical requirements
4.1 Usage performance
4.1.1 The calculation of rated load is determined according to formula (1). Q=F/n
In the formula: Q-——Maximum working load of single-limb wire rope sling, kN; F. Breaking tension of wire rope sling, kN;
n
Safety coefficient.
4.1.2 The minimum safety factor of the wire rope sling shall not be less than 5. 4.1.3 The ultimate working load shall be determined according to formula (2). Q,=Q·M
In the formula: Q, - ultimate working load, kN, M-
- lifting mode coefficient, selected according to Table 1.
Table 1 Hoisting mode coefficient
Wire rope sling
Number of limbs
Angle between limbs α
Angle with vertical line β||tt ||Mode coefficient M
4.2 Appearance requirements
Single limb
1
90°
45°
1.4||tt| |Double limbs
90120°
4560°
1
45°
2.1
Three limbs
45< 60°
1.5
4.2.1 For plugged wire rope slings, uneven braiding, wire clipping, core exposure, etc. are not allowed in the eye connection. 4.2.2 When crimping the wire rope sling, the surface of the casing should be smooth, the mold closing area should be smooth, and there should be no cracks. 4.2.3 No broken wire is allowed in the eye of the wire rope sling, 90°
45°
2.1
...(1)||tt| |(2)
limbs
90120°
4560°
1.5
4.2.4 Installed with links, chains, hooks, rings and other accessories The appearance of wire rope slings and accessories should comply with the regulations of GB6946, GB5974.1, GB14737, GB14735, and GB14736. 4.3 Material requirements
4.3.1 Selection of steel wire rope
a.
Selection,
The steel wire rope is a 6-strand structure type in GB1102, and its nominal tensile strength should be According to the reasonable strength level of the sling accessories GB14738-93
For steel wire slings used in highly corrosive environments, galvanized steel wire ropes should be used; b.
c.
Wire ropes must have quality certificates and accurate technical parameter certification documents. Wire ropes without quality certificates and unknown technical parameters shall not be used.
4.3.2 The material of the casing shall comply with the provisions of Article 2.1 of GB6946. 4.3.3 For wire rope slings equipped with accessories such as rings, chains, hooks, and rings, the materials of the accessories should comply with the provisions of Article 2.1 of GB5974.1, GB14737, GB14735, and GB14736. 4.4 Process requirements
4.4.1 Unloading
4.4.1.1 The surface of the wire rope should be kept clean. The wire rope is not allowed to drag on the ground before connection processing to avoid damage to the wire rope. 4.4.1.2 Steel wire ropes and casing bars should be cut by mechanical cutting, and should not be cut by fusing. 4.4.1.3 Before cutting, the steel wire rope should be tied tightly with thin iron wire 15 to 20mm away from both ends of the cut (see Figure 1 for the length of the bundle) to prevent loosening at the cut point. | |tt | It should be perpendicular to the axis of the casing, and the aluminum chips and burrs on the inner and outer walls of the casing should be removed. 4.4.2 Ring eye connection
4.4.2.1 Plug-in structure type (see Figure 2) Figure 2
1 - plug-in part; 2 - wire rope, 3 - wool GB14738-93||tt ||2. Wire rope slings used on a single limb should all be connected by hand with two cones and double flowers; b. The total number of flowers in the flower arrangement shall not be less than 21 flowers; the insertion length shall be 20 times the diameter of the steel wire rope; c.
d. After the insertion is completed, the remaining hair shall be no less than 25mm and no more than 30mm, and the excess part shall be Use cutting method to cut off. 4.4.2.2 Crimping structure type (see Figure 3) 0
Type A
Figure 3
1 set of rings, 2 sets of pipes, 3 one wire rope
8. The casing is selected according to the provisions of Article 1.3 of GB6946. Type B
b. After the casing and wire rope are assembled, they are extruded in the mold at one time, and the pressing force is in accordance with Table 1 in GB6946. Remove exposed flash burrs at the mold closing area and ends of the casing, but do not damage the wire rope. c.
d． Print the mark at the position specified in Figure 3. For the content of the mark, see Chapter 7. 4.4.2.3 When the wire rope sling is equipped with terminal accessories such as lifting rings and hooks, the eye part should be put into the collar before plugging or crimping. 5 Test method
5.1 Tensile test
5.1.1 Tensile test shall be conducted on 5% of the batch size of each steel wire rope diameter. The sampling quantity less than 5% shall not be less than five pieces. 5.1.2 The load for the sample tensile test is twice the rated load of the steel wire rope sling. During the test, the steel wire rope, thimble or casing is not allowed to have any abnormal phenomena such as slipping sound. If there is one unqualified product, the sampling test should be doubled. If there is another unqualified product, the batch of products should be prohibited from leaving the factory. 5.2 Breaking tensile test
5.2.1 The breaking tensile test of the wire rope sling shall comply with the relevant provisions of GB8358. 5.2.2 Remove the hooks, rings and other accessories from the wire rope sling, then install it on the tensile testing machine as shown in Figure 4, apply static tension, and measure the maximum load at break.
5.2.3 The spacing L of the stretching clamps (see Figure 4) shall not be less than 40 times the diameter of the wire rope, and the diameter D of the clamp pin shall not be less than 2 times the diameter of the wire rope.
GB14738—93
(a)
(b)
Figure 4
1 - Tensile clamp pin; 2 - Aluminum casting fixed clamp Item 5.2.4 The breaking tensile force of the wire rope sling breaking tensile test must satisfy the calculation formula (3). F,≥F. - Ke
Where: F.—
The breaking tension of the wire rope sling, kN;
F. The breaking tension of the selected wire rope, kN; c. —Efficiency coefficient, selected based on the data corresponding to the wire rope diameter in Table 2. Table 2 Wire rope diameter and efficiency coefficient
Structural type
Wire rope diameter, mm
Efficiency coefficient
d≤8
0.95
8
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