This standard specifies the technical determination of the braided mesh and barbed wire of the braided mesh fence, the tension determination, the braided mesh elasticity test and the material test methods. This standard applies to the braided mesh fence erected with steel columns (hereinafter referred to as the fence). According to different test purposes, the test items may be increased or decreased. JB/T 7138.4-1993 Braided mesh fence test method JB/T7138.4-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7138.4-1993
Plain Mesh Fence
Published on November 21, 1993
Test MethodsWww.bzxZ.net
Implemented on March 1, 1994
Ministry of Machinery Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Plain Mesh Fence
1 Subject Content and Scope of Application
Test Methods
JB/T7138.41993
Replaces ZBB92003-87
This standard specifies the technical determination of the braided mesh and barbed wire of the braided mesh fence, the determination of tension, the elasticity test of the braided mesh and the material test methods.
This standard applies to braided mesh fences erected with steel columns (hereinafter referred to as fences). According to different test purposes, the test items may be increased or decreased.
Referenced standards
GB/T2973
GB2976
ZB/TB91022
ZBB92005
Metal tensile test method
Galvanized steel wire zinc layer weight test method
Metal wire winding test method
Knitted mesh fence erection specification
Fence terminology
The terminology used in this standard shall comply with the provisions of ZBB92005. 4 Test instruments, equipment and tools
The test instruments, equipment and tools are shown in Appendix A (reference parts) and must be within the calibration period. 5 Technical determination of knitted mesh
Each technical determination is measured 3 times in total, and the arithmetic average is taken. The results are recorded in Table 1. 5.1 Measure the unfolded length of the knitted mesh.
5.2 Measure the number of joints of a single weft in the knitted mesh. 5.3 In the selected braided net samples, each roll of braided net is set up for 30m as the measurement area. When setting up, the average tension on each latitude line is 600~800N, and the columns at both ends should be installed firmly and reliably. Test the following items: 5.3.1 Determination of wave depth
Randomly select 1.5m in the measurement area, measure the wave depth one by one, the wave depth shall not be less than 1.80mm, and calculate the qualified rate. 5.3.2 Determination of knot displacement
Randomly select 6m in the measurement area, use a force of 100N to act on the knot one by one along the latitude and warp directions respectively, and the displacement shall not exceed 10mm, and calculate the qualified rate respectively.
5.3.3 Determination of side line knots
Select any 10m in the measurement area, and apply 100N force to the knot points one by one along the latitude direction. The displacement shall not exceed 10mm, and the qualified rate shall be counted; and the number of knots shall be checked and the qualified rate shall be counted. Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
4 Determination of wave distance
Select any 6m in the measurement area and measure the wave distance one by one. 5.3.5 Determination of warp spacing
JB/T7138.4-1993
Continuously measure 30 warp spacings in the measurement area and count the qualified rate. Measure the width of the network and measure the spacing of each latitude from top to bottom at the same time (except the spacing of the upper latitude). 5.3.6
Measure the tension of each weft wire and calculate the difference between the maximum tension and the minimum tension of the weft wire. Barbed wire technical determination
Measure 3 times in total, take the arithmetic mean, and record the results in Table 2.6.1Measure the unfolded length of the barbed wire mesh roll. 6.2Measure the number of joints in a roll of barbed wire. 6.3Measure the number of turns of the barbed wire around the strand.
6.4In the selected barbed wire coils, each roll of barbed wire is randomly selected to be 7.6m long, and measure the following items:Measure the barb distance and calculate the barb distance pass rate. 6.4.1
Continuously measure the barb length of 20 barbed wires and calculate the pass rate. 6.4.2
Continuously measure the number of twists between 40 spikes on a double-strand barbed wire, and record the number of twists less than the specified number. 6.4.3
Continuously measure 30 spikes on a single-strand barbed wire, and use a force of 50N to act on the spikes along the strand direction. The displacement is no more than 10mm, and the number of movements is recorded.
Determination of the tension of braided nets and barbed wires
Measure 3 times in total, take the arithmetic mean, and record the results in Table 3. 7.1 Purpose of tension determination
To assess whether the erection of the braided net meets the use requirements. 7.2 Measuring device and measurement method
Use the force measuring device shown in Figure 1 to measure at any 3 measuring points in the tensioning area. When a single weft or barbed wire of the knitted net is pulled to point A, record the reading of the tubular dynamometer and calculate the tension of the single weft or barbed wire using formula (1): F=KT
Wherein: F is the tension of the weft or barbed wire, N; T is the reading of the tubular dynamometer, N;
K is a constant, K=13.5.
.. (1)
Force plate
Tubular dynamometer
Elasticity test of knitted net
JB/T7138.4—1993
Measure three times in total, take the arithmetic mean, and record the results in Table 4. 8.1 The purpose of the elasticity test of knitted net is to evaluate the ability of the knitted net to recover deformation. 8.2 The measuring device and measuring method are shown in Figure 2. According to the provisions of Chapter 7 of ZB/TB91022 and Article 7.2 of this standard. A 30m braided net was set up and the tension of each weft of the braided net was measured. According to the number of wefts n of the braided net, 143nN, 214nN, and 286nN were applied to the braided net respectively. After 1 minute, the external force was removed and the tension of each weft was measured again. The rate of change of the tension of the braided net was calculated using formula (2):
Where: α
Tension change rate, %;
f——The total tension of each weft of the braided net after the external force is applied, N; f
——The total tension of each weft of the braided net in the initial state, N. (2)
9 Material test
9.1 Purpose of material test
Knitted mesh
JB/T 7138.41993
Force gauge
Through the test, the mechanical properties and galvanizing quality of the steel wire used for the knitted mesh and barbed wire are tested. 9.2 Selection of test specimens
9.2.1 The steel wire sample for knitted mesh is a section of mesh containing 4 warps cut from the end of the knitted mesh roll sample. 9.2.2 The steel wire sample for barbed wire is a 1.5m barbed wire cut from the end of the barbed wire roll sample. 9.3 Test items
Each test item is measured 3 times, and the average value is taken. The results are recorded in Table 5. Support rod
9.3.1 Determination of the diameter of galvanized steel wire: Use a measuring tool with an accuracy of 0.01mm to measure the wire diameter at any part of the sample in two directions perpendicular to each other.
9.3.2 The tensile strength shall be determined in accordance with the provisions of GB228. 9.3.3
The winding test of steel wire shall be carried out in accordance with the provisions of GB2976. When evaluating the mechanical properties of steel wire, the steel wire shall be tightly wound 6 times on a core sample equal to its own diameter; when evaluating the firmness of the zinc layer, the steel wire shall be tightly wound 6 times on a core rod equal to 4 times the diameter of the steel wire, and the winding speed shall not exceed 20r/min.
The weight test of the zinc coating of steel wire shall be carried out in accordance with the provisions of GB2973. When there is a dispute, the weight method shall be used for arbitration test. 10 Test report
After the test, a test report shall be submitted, and its contents are as follows a. Test purpose:
b. Test time, location, host unit and participating units; c. Introduction and technical characteristics of the fence;
d. Overview of the test situation;
e. Analysis of test results;
f. User opinions and existing problems;
g. Conclusion.
Specifications of braided net:
Number of braided net:
Qualified rate of knot displacement
Qualified rate of edge winding
Qualified rate of wave depth
Qualified rate of warp spacing
Maximum number of joints for a single weft
Unrolled length of net roll
Maximum deviation of weft spacing
Measurer:
Specifications of barbed wire:
Number of barbed wire:
|Qualified rate of barbed wire:
-Unfolded length of barbed wire
Number of barbed wire joints
Qualified rate of remaining distance
Qualified rate of barbed length
Number of coils of barbed wire
Along the weft
Along the warp
Displacement along the weft
Number of coils
Unqualified twist number of double barbed wire
Number of barbed wire movements of single barbed wire
Measurer:
JB/T 7138.41993
Recorder:
Recorder:
Technical measurement table of braided net
Design requirements
Technical measurement table of barbed wire
Design requirements
Test location:
Test date:
Auditor:
Test location:
Test date:
Auditor:
Measured results
Measured results
Specifications of braided net:
Number of braided net:
Specifications of barbed wire:
Tension force of braided net
Tension force of barbed wire
Measurer:
Specifications of braided net:
Number of braided net:
Dynamometer reading
Initial state Tension
JB/T7138.41993
Test table for tension of braided net and barbed wire
Barbed wire number:
Test location:
Test time:
Tension
Dynamometer reading
Recorder:
Tension
Dynamometer reading
Tension| |tt||Reviewer:
Table 4 Woven mesh elasticity measurement table
Test location:
Test date:
Tension
Difference between the maximum tension and the minimum tension on a single warp
Tension after stress
Tension change rate
Note: \ in the table is the number of warp threads in the knitted mesh. Determiner:
Specification:
No.:
Wire diameter
Edge weft
Middle weft
Warp, buckle wire
Barbed wire
Barbed wire
Gate wire
Determiner:
JB/T7138.4-1993
Recorder:
Auditor:
Mechanical properties and galvanizing quality record sheet of steel wireTest location:
Test date:
Mechanical properties
Tensile strength
Recorder:
Self-winding
Auditor:
Galvanizing quality
Weight of zinc layer
Winding test
Tube shape test Dynamometer (0~100N)
Tension meter (0~5000N)
Vernier caliper (0.05×125)
Steel ruler (300mm)
Steel tape measure (3m)
Meter ruler (0~50m)
Calculator
Iron chain (3m)
XLL-100 tensile testing machine
Measuring tool with accuracy of 0.01mm
Force plate
Tensioner
Additional instructions:
JB/T7138.41993
Appendix A
Test instruments, equipment and tools
(reference)
This standard is proposed and managed 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, Wu Genyuan and Zhao Weiyu. People's Republic of China
Mechanical Industry Standard
Test Method for Knitted Mesh Fence
JB/T 7138.41993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Word Count 14.000
1/16 Print Sheet 3/4
Format 880×1230
First Edition in January 1994
First Printing in January 1994
Print Quantity 1-500
Price 6.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn68
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