This standard specifies product varieties, technical requirements, test methods and inspection rules for shearer shielding and monitoring enhanced flexible cables with rated voltage 0.66/1.14 kV. This standard applies to copper core rubber insulated rubber sheathed shielded and monitored reinforced flexible cables for rated voltage 0.66/1.14 kV coal shearers and similar equipment. This standard should be used together with GB 12972.1. GB 12972.3-1991 Rubber-sheathed flexible cables for mining use Part 3: Rated voltage 0.66. 14 kv shearer shielding and monitoring enhanced flexible cable GB12972.3-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Mining rubber-sheathed flexible cables
Part 3: Rated voltage 0.66/1.14kV coal shearer shielding monitoring reinforced flexible cables
Flexible rubber-sheathed cables for mining purposes Part 3: Trailing coalcutters with monitoring core and semiconducting screens for rated voltage of 0.66/1.14kv Subject content and scope of application
GB12972.3--91
Replaces GB1170-74
This standard specifies the rated voltage 0.66 Product varieties, technical requirements, test methods and inspection rules for /1.14kV shearer shielding and monitoring enhanced flexible cables.
This standard applies to copper core rubber insulated rubber sheath shielded and monitored reinforced flexible cables for rated voltage 0.66/1.14kV coal shearers and similar equipment.
This standard should be used together with GB12972.1. 2Usage characteristics
2.1 Rated voltage U/U is 0.66/1.14kV. 2.2 The long-term allowable operating temperature of cable conductors is 90°C. 2.3 The minimum bending radius of the cable is 15 times the cable diameter. 2.4 Cables must not be exposed to sunlight for long periods of time. 3 model
3.1
cable models are shown in Table 1.
Table 1
Type
No.
UCPJB-0.66/1.14||UCPJR-0.66/1.14
Name

Coal shearer shielding and monitoring braided reinforced rubber
Sleeve soft cable
Coal shearer shielding and monitoring wrapped reinforced rubber
Set soft cable||tt| |2The cable type is shown in Figure 1. | |tt | . The cable can be directly towed and used
for power connections of coal shearers and similar equipment with rated voltages of 0.66/1.14kV and below. But the cable must be used within the protective chain plate 1992-03-01 Implementation
4 Specifications
GB12972.3--91
UCPJR-0.66/1.14
Figure 1
UCPJB-0.66/1.14
1 - power core conductor; 2 - control core conductor; 3 - insulation; 4 - semi-conductive shielding layer; 5 - inner sheath; 6 - monitoring line Core; 7-= is the wrapping reinforcement layer, ≠ is the braided reinforcement layer (also used as ground wire); 8 The specifications of the outer sheath cable should comply with the requirements in Table 2.
Table 2
Number of cores × conductor nominal cross-section, mm
Power wire core
3×35
3×50
3×70
3×39
Ground core
16
25
35
50
Control wire Core
2×2.5
2×2.5
2×2.5
2×2.5
Power line core
Absolute||tt ||edge
nominal thickness
1.4
1.6
1.6
1.8
Note: The nominal cross-section of the monitoring line conductor should not be Less than 1.5mm2. 5 Technical Requirements
5.1 The technical requirements of cables should comply with Table 3. 5.2 Conductor
Inner sheath
Calculated thickness
1.8
2.0
2.0
2. 4
Outer protection Sleeve
Nominal thickness
3.0
3.5
3.5
4.0
Cable outer diameter
UCPJR-0.66/ 1.14
Minimum
40.0
45.5
50.5
56.0
5.2.1 Single wires in conductors shall be tinned. In addition to monitoring the core, the surface of the conductor should be covered with an isolation layer. 5.3 Insulation
Maximum
44.5
50.5
55.0
61.5
mm
UCPJB-0.66/1.14| |tt||Minimum value
42.0
47.5
51.0
58.0
Maximum value
47.0
52.0| | tt | .
5.3.2 The insulation shield adopts the Class A structure in Table 5 of GB12972.1. 5.4 Cable core
5.4.1 The position of the control wire core complies with the provisions of Article 7.2a of GB12972.1. 5.4.2 The position of the monitoring wire core shall comply with the provisions of Article 7.3a of GB12972.1. 5.4.3 The position of the ground core complies with the requirements of GB12972.1 Article 7.4d. 5.4.4 The stranded pitch diameter ratio of the cable core should not be greater than 85.5 Sheath
GB12972.3-91
5.5.1 The inner sheath should comply with the XH-31A regulations in GB7954.10. 5.5.2 The outer sheath should be made of neoprene-based sheath rubber, and its performance should comply with the provisions of Appendix B of this standard. 5.5.3 The outer sheath should be yellow.
5.6 Reinforcement layer
5.6.1 The reinforcement layer of UCPJB-0.66/1.14 type shall comply with the provisions of GB12972.1 Article 9.2b; UCPJR-0.66/1.14 type shall comply with GB12972.1 Article 9.2c Provisions.
5.6.2 The coverage rate of UCPJB-0.66/1.14 type should not be less than 70%, and the coverage rate of UCPJR type should not be less than 90%. 6 Testing and Inspection Rules
Products are tested as specified in Table 3.
Table 3
Serial number
1
1.1
1.2
1.3
1.4
1.5| |tt||1.6
1.7
2
2.1
2.2
2.3
2.3.1
2.3. 2
2.4
2.5
2.6
3
4
Project name
Structural size
Conductor
Insulation thickness
Shielding layer
Cable core
Sheath thickness
Reinforcement layer
Cable outer diameter
Cable performance
Conductor resistance
Transition resistance
Power frequency AC voltage
Test
Type test
Factory test
Combustion test
Insulation physical machinery
Performance
Sheath physical machinery
Performance
Identification mark
Delivery length||tt| |Technical requirements
GB12972.1 Article 4.1 and this standard Article 5.2 GB12972.1 Article 5.2 and this standard Table 2
This standard Article 5.3.2
GB12972. 1 Article 7 and Article 5.4 of this standard GB12972.1 Article 8 and Table 2 of this standard
Article 5.6 of this standard
Table 2 of this standard
Table 1 of GB12972.1
Not more than 500Q
GB12972.1 Table 8
3kV5min insulation without breakdown
GB12972.1 Article 11.6
Article 5.3 of this standard| |tt||Article 5.5 of this standard
Article 10 of GB12972.1
Article 11.12 of GB12972.1
Note: St means periodic testing, which should be conducted at least once a year. Test type
T,s
T,s
T,s
T,s
T,s
T,s
T,s
T,R
T,s
T||tt ||R
T,St
T,St
T,St
T,s
R
Test method|| tt||GB4909.2
GB2951.2
Visual inspection
Hinging visual inspection
GB2951.3
Calculated according to Appendix C of this standard| |tt||GB2951.4
GB3048.4
Appendix E of this standard
GB3048.8
GB12666.2
GB2951||tt| |GB2951 and Appendix D of this standard
GB6995
Meter counter
Serial number
1
1.1
1.2
2
2.1
2.2
3
3.1
3.2
4
4.1
4.2| |tt||5
Serial number
1
1.1
Sample before aging
Tensile strength
Elongation at break| |tt||Air box thermal aging test
Test temperature
Test time
Change rate of tensile strength
Change rate of elongation at break
Air Elastic aging test
Test temperature
Test pressure
Test time
Change rate of tensile strength
Change rate of elongation at break
Thermal extension test
Test temperature
Mechanical stress
Loading time
Cut load elongation
Permanent deformation after cooling
Volume resistance Coefficient
Test temperature
Sample before aging
Tensile strength
GB12972.3-91
Appendix A
Rubber insulation properties Requirements
(Supplement)
Table A1
Test items
Minimum value
Minimum value
Maximum value
maximum value
maximum value
maximum value
minimum value
maximum value
maximum value
minimum value
record
Attachment
B
Rubber sheath performance requirements
(supplement)
Table B1
Test items
Minimum value
MPa
%
C
h
%
%
℃
kPa
h
%
%
kPa
min
%
%
n.cm
MPa
4.2
200
refers to
135±3
7×24
±30||tt ||±30
127±1
550±20
40
±30
±30
200±3|| tt||200
15
175
25
1012
20±5
standard
refers to|| tt||Standard
15.0
Serial number
1.2
2
2.1
2.2
2.3||tt| |3
4
4.1
4.2
5
5.1
5.2
6
Broken Elongation
Air box thermal aging test
Test temperature
Test time
Tensile strength change rate
Elongation at break||tt| |Change rate of elongation at break
Tear strength
Hot elongation test
Test temperature
Mechanical stress
Loading time
Load Elongation under load
Permanent deformation after cooling
Oil immersion test
Test temperature
Test time
Tensile strength change rate||tt| |Change rate of elongation at break
Surface resistance coefficient
Test temperature
c1
The braided layer coverage density is calculated according to the formula (C1): where: .braided layer Coverage density, %.
Where: D——pitch circle diameter of braided layer, mm, d——calculated width of stranded wire, mm;
GB12972.391
Continued table B1||tt ||Test item
Min
Maximum
Maximum
Maximum
Minimum
Maximum||tt| |Maximum value
Maximum value
Maximum value
Minimum value
Appendix C
Covering density calculation method
(Supplement)| |tt||P=(2pp)×100
mnd1+
p=
D
L3
....
%
c
h
%
%
%
N/mm
℃
kPa
min
%
%
c
h
%
%
Q| |tt||℃
300
refers to
100±2
7×24
± 30
250||tt| |±40
30
200±3
200bzxZ.net
15
175
25
100±2| |tt||24
±40
±40
109
20±5
+..... .+..........
mark
.....(C1)
The number of spindles in the same direction of a knitting machine; ||tt ||The number of strands per spindle;
L braiding pitch, mm.
The wrapping density is calculated according to formula (C2): C2
where: F
D-
d
m||tt| |Covering density of the cladding layer, %;
Pitch circle diameter of the cladding layer, mm;
Calculated width of the stranded strands, mm;
Number of stranded strands;|| tt||L—winding pitch, mm.
Test equipment
D1
D1.1
GB12972.3—91
md
D2
Appendix D

Resistance tester
D1.2 DC voltage source
100V.
The temperature is 20℃ and the relative humidity is 65%. D1.3 standard environmental climate chamber
D2 test method
(C2)
3-section sheath, each 15cm long, is placed on an insulating rod with a diameter equal to the inner diameter of the sheath. Clean the surface of the sleeve with alcohol, and wrap copper wire around two places 10±0.5mm apart. The diameter of the copper wire is 0.20.6mm, clean the surface of the sheath again. The sample was placed in a standard environmental climate chamber for 24 hours. After being taken out, a 100V DC power supply was applied immediately for (60 ± 3) s, and the surface resistance R was measured. Then multiply by a/10, where a is the circumference of the sheath (cm), and the result is expressed in Q.
Note: If the surface resistance is very high and exceeds the instrument range, n samples can be connected in parallel and the measured value is multiplied by ·4/10. Appendix E
Transition resistance test method
(supplement)
E1
Testing instruments and equipment
E1.1
Resistance measurement instrument.
E1.2 copper-zinc alloy round probe with a diameter of 5mm and a radius of curvature of the end tip of 2.5mm. E1.3 DC voltage source 9V.
E2·Sample Preparation
The sample can be the entire length of the finished product or a section, but at least 5m. One end of the sample exposes the conductor and the concentric conductor. At the other end of the sample, GB12972.3-91
peels off the sheath, the concentric conductor bends outward, and the semi-conductive layer on the insulation is exposed for at least 0.1m. E3 Test Preparation
Connect the exposed conductor end to one of the terminals of the resistance meter. The drill is connected to the other terminal. E4 test steps
The probe is pressed vertically on the exposed semiconductive layer, the pressure is 30±5N, the distance is 20mm, and 5 values ??are measured. , E5 test results
take the arithmetic average of 5 measured values, and the average should not exceed the standard value. Appendix F
Tear strength test method
(supplement)
F1 test instruments and equipment
F1.1 tensile testing machine.
Both chucks of the F1.2 clamp can clamp the test piece. F1.3 punching die should be able to punch test pieces as shown in Figure F1. 75
Figure F1
S-tear length, mm
F1.4 thickness gauge
F1.5 surface treatment machine, cut flat or polish the test piece surface. F2 sample preparation
2 samples, each 100mm long, punched according to Figure F1, remove surface fiber adhesion if necessary, need to be treated with a surface treatment machine, the thickness is 2.0±0.3mm, tear along the The crack length was measured at 5 thicknesses and the average value was taken. Clamp the sample on the testing machine, as shown in Figure F2. F3 test steps
GB 12972.3-91
Figure F2
Tear the test piece, the chuck speed is about 500mm/min, and test the maximum tensile force, measured in N. F4 test results
If both measurement values ??are not less than the specified minimum value, it is considered qualified. The tear strength is equal to the maximum tensile force (N) divided by the thickness of the test piece (mm).
Tear strength is the average of 2 calculated values. Additional notes:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. This standard was drafted by Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry, Fushun Branch of the General Institute of Coal Science and Technology and other units. The main drafters of this standard are Liu Fenglin, Gu Yu and Shi Xingrui.
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