This standard specifies the technical requirements for galvanized steel wire used in the main components of woven mesh fences, the technical indicators of woven mesh, inspection rules and marking, packaging, transportation and storage. This standard applies to woven mesh fences and woven mesh. JB/T 7138.1-1993 Technical conditions for woven mesh fences and woven mesh JB/T7138.1-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Plaited Mesh Fence
Subject Content and Scope of Application
Technical Conditions for Plaited Mesh
JB/T7138.1-93
Replaces ZBB92002-87
This standard specifies the technical requirements for galvanized steel wire used for plaited mesh, the main component of plaited mesh fence, the technical indicators of plaited mesh, inspection rules and markings, packaging, transportation and storage.
This standard applies to plaited mesh fence plaited mesh. 2 Reference standards
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB/T13306 Signs
JB/T7137
Galvanized steel wire fence
JB/T7138.4
ZBB92005
3 Terminology
Knitted mesh fence
Fence terminology
Basic parameters
Test methods
The terms used in this standard shall comply with the provisions of ZBB92005. 4 General requirements
Knitted mesh shall comply with the provisions of this standard and shall be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 Without affecting the product quality and service life, it is allowed to use steel wire with other coatings for production. 4.3 Galvanized steel wire for braided mesh (hereinafter referred to as steel wire) shall comply with the following provisions: The steel wire diameter and zinc layer quality shall comply with the provisions of Table 1. 4.3.1
Steel wire and zinc coating for braided meshbZxz.net
Steel wire diameter and allowable deviation
Reverse weft
Middle weft
Warp, buckle wire
2.8±0.08
2.5±0.07
Zinc layer quality g/m2
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||t t||The mechanical properties of steel wire shall meet the following requirements: the tensile strength of the weft wire shall not be less than 900MPa, and the tensile strength of the warp and loop wire shall not be less than 550MPa; the steel wire shall not break after being tightly wound 6 times on a core rod equal to its own diameter. Approved by the Ministry of Machinery Industry of the People's Republic of China on November 21, 1993 and implemented on March 1, 1994
Technical requirements for shrinkage nets
JB/T7138.1-93
The specifications of braided nets shall comply with the provisions of Article 4.1 of JB/T7137. 5.2 Braided nets shall be supplied in rolls, and the length of each roll shall not be less than 200m, and the length of both ends excluding the warp is 400-500mm. 5.3 In a 200m long braided net, each weft is allowed to have one knotted joint, and the warp is allowed to have one knotted joint. No joints are allowed. 5.4
The technical indicators of the braided net should meet the following requirements: 5.4.1
The maximum difference in the tension of each weft line of the shrinkage net shall not exceed 400N. After the elastic test of the braided net, the rate of change of the tension shall not be greater than 30%. 5.4.3 The wave spacing on the weft line of the braided net is 150mm±30mm. 5.4.4 The width of the braided net and the spacing of the weft lines shall comply with Article 4.1.1 of JB/T7137 or the provisions of the contract between the supply and demand parties. The dimensional deviation of the width of the braided net is ±20mm. Except for the spacing of the upper weft lines, the dimensional deviation of the spacing of each weft line from bottom to top of the braided net is 8mm. 5.4.5
All technical indicators shall comply with the provisions of Table 2. Technical indicators of shrinkage net
Testing items
Edge line entanglement||tt ||Displacement along the warp
Displacement along the latitude
Displacement along the latitude
Number of winding circles
Warp spacing
Test method
Single index
Not less than 1.8mm
Displacement under 100N force is not more than 10mmDisplacement under 100N force is not more than 10mmDisplacement under 100N force is not more than 10mmNot less than 2 circles
Warp spacing deviation is ±20mm
The determination and test method of knitted nets shall be carried out in accordance with the provisions of Chapters 5, 7, 8 and 9 of JB/T7138.4. 7 Inspection rules
7.1 Factory inspection
7.1.1 Knitted nets shall be inspected and qualified by the quality inspection department of the manufacturer before they 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
7.2.1 Type inspection shall be carried out in any of the following cases: a.
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 shall be 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. Statistical indicators Qualification rate, %
7.2.2 According to the provisions of GB2828, a normal inspection sampling plan is adopted, and the batch range is the number of braided net rolls N=91～150. The type inspection judgment rules are shown in Table 3.
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. 468
Sampling plan
Judgment rules
Item name
Number of items
Inspection level
Sample code
Number of samples
Marking, packaging, transportation and storage
JB/T7138.1-93
Table 3 Judgment rules for type inspection
Class A failure
1. Zinc layer solidity
2. Mechanical properties of steel wire
3. Quality of galvanized layer
4. Change rate of tension after elastic test of braided net 5. Qualified rate of wave depth
6. Qualified rate of displacement of knot along latitude
Class B failure
1. Straightness of steel wire 1. Diameter
2. Unrolled length of net roll
3. Net width and weft spacing
4. Number of joints on a single weft
6. Maximum steam value of tension of each weft
7. Qualified rate of knot displacement along warp
8. Qualified rate of edge knot displacement
9. Qualified rate of edge knot pattern
10. Qualified rate of warp spacing
11. Marking and packaging
Each roll of braided net should have a label, which should comply with the provisions of GB/T13306 and should indicate: a,
Manufacturer name;
Product name;
Product specifications and markings;
Manufacture date or factory number.
The outer diameter of the braided net roll shall not be greater than 800mm. It shall be firmly tied with steel wire with a diameter of not less than 2.0mm, and the wire head shall not bend outward. When the braided net leaves the factory, the following documents shall be attached: a.
Product certificate;
User feedback form;
Instructions for setting up the braided net.
Avoid contact with acids, alkalis and salt substances during transportation and storage to prevent corrosion. During transportation and storage, the nets shall be stacked neatly to prevent rolling and injuring 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 the Inner Mongolia Animal Husbandry Machinery Production and Sales Joint Company and the Hohhot Animal Husbandry Machinery Research Institute. The main drafters of this standard are Shi Wenbin, Wu Manzhi, Jia Fuzeng and Wang Yixian. 469
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