This standard specifies the technical requirements for galvanized steel wire used as the main barbed wire component of woven mesh fences, the main technical indicators of double-strand and single-strand barbed wire, inspection rules and marking, packaging, transportation and storage. This standard applies to braided mesh fence supports and connectors. JB/T 7138.2-1993 Technical conditions for braided mesh fence barbed wire JB/T7138.2-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Plaited Wire Mesh Fence
1 Subject Content and Scope of Application
Technical Conditions for Barbed Wire
JB/T7138.2~93
Replaces ZBB92002-87
This standard specifies the technical requirements for galvanized steel wire used for barbed wire, the main technical indicators of double-strand and single-strand barbed wire, inspection rules and marking, packaging, transportation and storage. This standard applies to barbed wire for plaited wire fences. 2 Reference standards
GB2828 Count sampling procedures and sampling tables for batch inspection (applicable to continuous batch inspection) Signs
GB/T13306
JB/T7137
Galvanized steel wire fence
Basic parameters
JB/T 7138.4
Knitted mesh fence
ZBB92005
Fence terms
3 Terms
Test methods
The terms used in this standard shall comply with the provisions of ZBB92005. General requirements
Barbed wire for knitted mesh fences shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.1
4.2 It is allowed to use steel wire with other coatings without affecting the quality and service life of the product. 4.3 Galvanized steel wire for barbed wire (hereinafter referred to as steel wire) shall comply with the following provisions: the diameter of the steel wire, mechanical properties and quality of the zinc layer shall comply with the provisions of Table 1. 4.3.1
Steel wire for barbed wire
Wire diameter and allowable deviation
Double-strand barbed wire
Single-strand copper wire
Stranded wire and barbed wire
Shaved wire
2.5.2.2,2.0
2.8±0.08
2.0±0.07
Tensile strength
350660
900~1500
350660
Quality of zinc layer
Hot-dip galvanizing
Electro-galvanizing
4.3.2 After the steel wire is tightly wound 6 times on a mandrel equal to 4 times its own diameter, the zinc layer shall not crack and cannot be wiped off with bare fingers. 4.3.3 After the steel wire is tightly wound on the mandrel with the same diameter as itself for 6 turns, the steel wire shall not break. The Ministry of Machinery Industry of the People's Republic of China approved 470 on November 21, 1993
1994-03-01 Technical requirements for the sale of barbed wire
JB/T7138.2--93
5.1 The specifications and basic parameters of the remaining steel wire shall comply with the provisions of Article 4.2 of JB/T7137. 5.2 The barbed wire shall be supplied in rolls, and the unrolled length of each roll shall not be less than 200m or determined by agreement between the supplier and the buyer. One knot-type joint is allowed within the length of 200m.
5.3 The barb distance shall be uniform. On a barbed wire with a length of 7.6m, the qualified rate of barb distance shall not be less than 90%. Among the 30 barbed wires measured continuously, the qualified rate of barb length shall not be less than 90%. 5.4
The barbed wire should be tightly wound on the strands, and the number of windings shall not be less than 2. 5.5
5.6 There should be a specified number of stabs between two adjacent barbed wires of double-strand barbed wire. In the 40 consecutive barb distances measured, the number of stabs less than the specified number shall not exceed 2.
The barbed wire of single-strand barbed wire should not move along the strands. In the 30 consecutive barbed wires measured, the number of stabs that move shall not exceed 2. Test methodbzxZ.net
The inspection and test methods of barbed wire shall be carried out in accordance with the provisions of Chapters 6 and 9 of JB/T7138.4. 7 Inspection rules
7.1 Factory inspection
7.1.1 Barbed wire shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped. 7.1.2 The items of factory inspection shall include the contents of Article 5.1 and Chapter 8 of this standard. 7.2 Type inspection
Type inspection should be carried out in any of the following situations: trial production and identification of new products or old products transferred to the factory for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; during normal production, type inspection is carried out once a year; when the product is resumed after a long period of suspension; when the national quality supervision agency proposes type inspection requirements. According to the provisions of GB2828, a normal inspection sampling plan is adopted, and the batch range is the number of barbed wire coils N=71～1450. The type inspection judgment rules are shown in Table 2.
7.2.3 When the number of unqualified products inspected is less than or equal to A, the batch of products is judged to be qualified; when the number of unqualified products inspected is greater than or equal to R., the batch of products is judged to be unqualified. Table 2 Type inspection judgment rules
Class A unqualified
1. Zinc layer solidity
Item name
Sampling plan
Number of items
Inspection level
Sample code
Number of samples
Judgment rules
2. Mechanical properties of steel wire
3. Quality of galvanized layer
4. Pass rate of thorn distance
5. Pass rate of thorn length
Class B unqualified
1. Steel wire diameter
2. Unfolded length of mesh roll
3. Each Number of joints in the roll
4. Number of coils of the barbed wire wrapped around the strands
5. Number of unqualified double-strand barbed wires or number of single-strand barbed copper wire barbed wires along the strands
6. Marking and packaging
Marking, packaging, transportation and purchase and storage
JB/T7138.293
Each roll of barbed wire should have a label, which should comply with the provisions of GB/T13306. The label should indicate: a.
Manufacturer name;
Product name;
Product specifications and markings;
Manufacturing date or factory number.
Use steel wire with a diameter of not less than 2.0mm to evenly bind the four sides of the barbed wire coil, and the wire head shall not bend outward. When barbed wire leaves the factory, the following documents shall be attached: a.
Product certificate;
User feedback form;
Instruction manual.
Avoid contact with acid, alkali and salt substances during transportation and storage to prevent corrosion. During transportation and storage, it should be stacked neatly to prevent rolling and hitting people or objects. Additional notes:
This standard was proposed and coordinated by the Hohhot Animal Husbandry Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Inner Mongolia Animal Husbandry Machinery Production and Sales Joint Company and Hohhot Animal Husbandry Machinery Research Institute. The main drafters of this standard are Shi Wenbin, Wu Manzhi, Jia Fuzeng and Wang Suixian. 472
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