This standard applies to the steel legs for disc-shaped suspension porcelain and glass insulators for AC overhead power lines (hereinafter referred to as steel legs). JB/T 9677-1999 Steel legs for disc-shaped suspension insulators JB/T9677-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 9677-1999
Disc Suspension Insulator Steel Leg
Published on August 6, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T9677-1999
This standard is a revision of ZBK50001-87 "Disc Suspension Insulator Steel Leg". The ball head dimensions of this standard are equivalent to IEC60120 (1984) "Ball and Socket Connection Dimensions of Insulator String Components". Appendix A of this standard is a prompt appendix.
Appendix B of this standard is a standard appendix.
This standard will replace ZBK50001-87 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Insulators. The drafting units of this standard are Xi'an Electric Ceramics Research Institute and Chengdu Standard Parts Factory No. 3. The main drafters of this standard are Cai Meicheng, Yin Heqing, He Weiyi, Liu Shuheng and Ding Jingling. Xi'an Electric Ceramics Research Institute is entrusted with the interpretation of this standard. 1 Scope
Machinery Industry Standard of the People's Republic of China
Steel Legs for Disc Suspension Insulators
JB/T9677-1999
Replaces ZBK50001-1987
This standard applies to steel legs for disc suspension porcelain and glass insulators for AC overhead power lines (hereinafter referred to as steel legs). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard: the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T699—1988
GB/T700—1988
GB/T1591-1994
GB/T1804—1992
GB/T2900.8—1995
GB/T 3077—1988
GB/T3177—1997
GB/T4056-1994
JB/T3384—1999
JB/T8177—1999
3 definitions
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Technical conditions for low-alloy structural steel
General tolerancesUnspecified tolerances for linear dimensions
Electrical termsInsulators
Technical conditions for alloy structural steel
Inspection of smooth workpiece dimensions
Connection structure dimensions of high-voltage line suspension insulatorsSampling plan for high-voltage insulators
General technical conditions for hot-dip galvanized coating of insulator metal accessoriesThe definitions of terms used in this standard shall comply with the provisions of GB/T2900.8. For definitions of appearance quality, see Appendix B (Appendix to the standard).
4 Grades and type dimensions
4.1 Steel feet are divided into 8 grades according to the corresponding electromechanical destructive strength grades of suspension insulators: 70, 100, 120, 160, 210, 300, 400 and 530 kN.
4.2 Steel feet are divided into two categories according to the connection structure type: ball-type connection steel feet and groove-type connection steel feet, as shown in Figures 1 and 2. 4.3 Steel feet should be manufactured according to the drawings approved by the prescribed procedures. The dimensions of the steel feet are all hot-dip galvanized. The connection dimensions and tolerances of the steel feet should comply with the provisions of GB/T4056. Other dimensions and tolerances for ball-type connection steel feet should comply with the provisions of Figure 1 and Table 1, and for groove-type connection steel feet should comply with the provisions of Figure 2.
Approved by the State Machinery Industry Bureau on August 6, 1999 and implemented on January 1, 2000
JB/T9677-1999
1) The rs dimension in the figure can be appropriately adjusted as needed. Figure 1
@17.5±0.8
22.3±1.1
Steel foot model
Q16×98-70||t t||Q16×104-70
Q16×106-70
Q16×109-70
Q16×104-1 00
Q16×106-100
Q16×122--100
Q16X109-120||tt| |Q20×109-160
Q20×116-160
Q20×120-160
Q20X134- 160
Q24×126-210
Q24X130-210
Q24×133-210
Q24X152-300
Q24×150300
(To be determined)
(To be determined)
JB/T9677-1999
Size of ball-type connecting steel feet
17-1.233.3-1.513.4-.2
122±#8
120±±8
133±18
1Q24×126-210 and Q24×130-210 are transitional products. 2 Within the dimension range of H, the dimension shall meet the tolerance specified in the table. Inch
Cone head size
28±0.550
5.73.5±:42.536±1.0
42±1.980
46.542±1.0
48±1.d100
48±1.980
15-1:552.0
3 For self-produced steel feet, the total length of the steel feet and the cone head size in the table are recommended dimensions. 4 Steel foot model description:
Q—indicates ball-type connection steel foot, C—indicates groove-type connection steel foot. The number before the "symbol" is the connection mark × the total length of the steel foot, followed by the strength grade of the steel foot. 5 Technical requirements
Applicable to insulation
Sub-model example
LXP--70
LXP1-70
LXP-100
XP-100
XP-120
LXP-120
XP-160
XP-160
LXP-160
XP-210
XP-210
LXP-3 00
XP-300
XP-400
XP-530
5.1 The physical and chemical properties of the steel used to make the steel feet shall comply with the requirements of GB/T700, GB/T1591, GB/T699 and GB/T3077 respectively. The recommended steel grades are shown in Appendix A (suggestive appendix). 5.2 Appearance quality of steel feet
5.2.1 The entire surface of the steel feet shall be evenly coated with a layer of hot-dip galvanized. In addition to complying with this standard, the appearance quality of the zinc layer shall comply with the relevant provisions of JB/T8177.
5.2.2 Overburning and disassembly are not allowed on any part of the steel feet. 5.2.3 Cracks are not allowed on the steel feet. If the steel itself has hairline, it shall comply with this The national standard for steel materials stipulates that the mechanical strength and zinc layer quality of the steel feet should meet the requirements of this standard.
JB/T9677-1999
5.2.4 The surface of the steel foot should be smooth and flat. The protrusion height of burrs, flash residues, mold seams, zinc piles, zinc slag and other defects should not exceed 0.3mm. However, no protrusion defects are allowed on the spherical surface of the foot ball connection. 5.2.5 The depth of dents such as local oxidation and bruises should not exceed 0.3mm for the connection part, and should not exceed 0.4mm for other parts. The area of ​​a single defect should not exceed 0.6mm, and the total number of defects should not exceed 2. 5.3 Shape and position tolerances of steel feet:
5.3.1 Straightness tolerance of the steel foot rod: total steel foot When the length is 120mm or less, it should not be greater than 0.3mm; when the total length of the steel foot is greater than 120mm, it should not be greater than 0.4mm.
5.3.2 The tolerance of the end face circular runout of the steel foot cone head should not be greater than 0.4% of the total length of the steel foot, and the radial circular runout tolerance of the ball head and cone head with the rod axis as the reference axis should not be greater than 0.7mm
5.3.3 The roundness tolerance of the steel foot rod: when the rod diameter is 17mm or less, it should not be greater than 0.4mm; when the rod diameter is greater than 17mm, it should not be greater than 0.5mm.
5.3.4 The symmetry of the hole on the flat head of the grooved connection steel foot and its two sides to the rod axis should not be greater than 0.5mm. 5.3.5 The limit deviation of the size without tolerance shall comply with the provisions of Class C in GB/T1804. 5.4 The thickness, uniformity and unit area quality of the hot-dip galvanized zinc layer of the steel legs shall comply with the relevant provisions of JB/T8177. 5.5 The tensile breaking load of the steel foot shall comply with the provisions of Table 2 of this standard. Table 2 Mechanical tensile breaking load of steel foot
Strength grade of steel foot
Tensile breaking load
Not less than
6 Inspection rules and test methods
6.1 The steel foot shall be inspected and accepted by the technical inspection department of the manufacturer. The manufacturer shall ensure that the steel foot leaving the factory meets the requirements of this standard. 400
6.2 According to the inspection rules and test methods specified in this standard, the user has the right to inspect the quality and indicators of the steel foot in accordance with the provisions of 6.3.1 and 6.3.2 of this standard to see whether they meet the requirements of this standard. 6.3 The steel foot test is divided into individual test, sampling test and type test, and the test methods shall be carried out in accordance with the provisions of this standard. 6.3.1 Individual test
The steel foot shall be inspected one by one according to the provisions of Table 3. If the inspection does not meet any of the requirements specified in Table 3, the steel foot shall be unqualified.
Table 3 Test items one by one
Test name
Appearance quality inspection
Football connection size inspection
5.2 of this standard
Test basis and requirementsbZxz.net
Football size in 4.3 of this standard shall be checked according to the gauge specified in GB/T4056 Note: If the production process of the manufacturer can ensure that the football size meets the standard requirements, sampling inspection is allowed according to the provisions of 6.3.2 of this standard. If there are unqualified products in the first sampling, the batch of products shall be checked by gauge one by one. 6.3.2 Sampling test:
6.3.2.1 Steel feet shall be accepted in batches. The same type of steel feet made by the same process method in a similar period of time shall be counted as a batch. The quantity of each batch shall be agreed upon by the supply and demand parties.
6.3.2.2 The sampling test of steel feet shall be carried out by randomly selecting samples from a batch that has passed the individual tests. The sampling rules shall be in accordance with the provisions of JB/T3384.
a) The steel foot size, shape and position deviation and appearance quality inspection shall adopt piece-count secondary sampling plan;4
b) The zinc layer test shall adopt piece-count secondary sampling plan JB/T9677-1999
c) The steel foot mechanical strength test shall adopt the metrological secondary sampling plan. 6.3.2.3 The steel foot sampling test items shall be in accordance with Table 4. Table 4 Sampling test items
Test items
Dimension inspection
Geometric deviation inspection
Zinc layer test
1) Magnetic thickness measurement (mandatory item)
2) Uniformity test (agreement item)
3) Weight method (arbitration item)
4) Bond strength test
Tensile breaking load test
Test basis
4.3 of this standard
5.3 of this standard
5.4
5.5 of this standard
Test method
6.5 of this standard
6.6
JB/T8177
6.7 of this standard
During the test, even if one item does not meet the requirements specified in Table 4, the batch of products shall be unqualified. However, if the size, appearance and shape deviation are unqualified, the manufacturer is allowed to conduct a one-by-one inspection and resubmit for acceptance according to this sampling inspection plan. 6.3.2.4 The sample capacity and judgment criteria of the piece-rate secondary sampling plan shall comply with the provisions of Table 5. Table 5 Piece-rate secondary sampling plan
151~500
501~1200
1201~10000
10001~35000
Sample capacity
Piece-rate secondary sampling judgment procedure is as follows:
Acceptance number A
Rejection number R
Randomly select the first sample n (number of samples for each test) from the batch N for testing. If the number of unqualified products d,Ae1 in n, then the batch is accepted. If d,≥Re1, then reject the batch. If A.
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