This standard specifies the type and size, technical requirements, test methods, inspection rules, marking and packaging of porcelain shafts for electrostatic precipitators. JB/T 6746.2-1993 Porcelain insulators for electrostatic precipitators Porcelain shafts JB/T6746.2-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Porcelain Insulators for Electrostatic Precipitators
Subject Content and Scope of Application
Porcelain Rotating Shaft
JB/T 6746. 293
This standard specifies the type and size, technical requirements, test methods, inspection rules, marking and packaging of porcelain shafts for electrostatic precipitators (hereinafter referred to as shafts).
This standard applies to DC rated voltages of 72, 80, 90, and 100 kV, operating temperatures of 150 and 250 °C, and installation locations not exceeding 1000 m above sea level.
This standard does not apply to insulators used in working environments that are sufficient to reduce the performance of the shaft and cause exposure to the surface of the shaft porcelain. Reference standards
Technical conditions for high-voltage insulator porcelain parts
GB775.1~775.3
Test methods for insulators
JB/Z262
JB/Z94
3 Terminology
Electrical terminology Insulators
Ultrasonic detection of internal defects in porcelain parts
Insulators Product packaging
The terms used in this standard comply with the provisions of GB2900.8. 4 Type and size
4.1 The shaft shall be manufactured according to the drawings approved by the prescribed procedures. Its type and main dimensions shall comply with the provisions of Figures 1 to 4 and Table 1 respectively. dShenL
Approved by the Ministry of Machinery Industry on August 21, 1993
Implemented on October 1, 1993
JN-07 201A
JN-07202A
JN-07203A
JN-08001C
JB/T6746.2—93
Table 1 Main dimensions of the shaft
JN-08002C
JN-10001C
The shaft model is expressed as follows:
5 Technical requirements
JB/T 6746.2—93
Continued Table 1
The working temperature is divided into two types: A and C, which represent 150℃ and 250℃ respectively.
Product design sequence number, represented by two Arabic numerals. DC rated voltage: kV
Ceramic shaft for electrostatic precipitator
5.1 The shaft shall be made of heat-resistant porcelain material. The appearance quality of its porcelain parts shall comply with the corresponding provisions of GB772. 5.2 The cross section of the shaft shall be homogeneous and dense, and there shall be no penetration after the porosity test. During the porosity test, the pressure The force is not less than 20MPa, and the product of pressure and time is not less than 180MPa·h. 5.3 The shaft should be glued with high temperature resistant adhesive. When gluing, the exposed surface of the adhesive should be flat. 5.4 The exposed surface of the metal accessories of the shaft should be rust-proofed, and the screw holes should be coated with anti-rust oil. 5.5 The parallelism of the two end surfaces of the metal accessories of the shaft and the coaxiality of the center of the mounting hole should not exceed 2mm. 5.6 The shafts should be ultrasonically inspected one by one before gluing, and there should be no defects (such as cracks, pores and interlayers) that can be detected by ultrasound inside the porcelain parts.
5.7 The shaft should be able to withstand 10s of torsion load test one by one without damage. The load during the test is 600N·m. 5.8 The torsional failure load of the shaft should be not less than 1000N·m. 5.9 The shaft should be able to withstand 3 temperature cycle tests with a temperature difference of 60K without damage. 5.10 The shaft should be able to withstand a 1-hour high-temperature electromechanical load test without damage or flashover. The temperature, torsion load and DC test voltage during the test should comply with the provisions of Table 2. When the AC voltage is used instead of the DC voltage test, the qualified range of the rated voltage value is the DC voltage value divided by 2.
5.11 Within 2 years from the date of delivery (i.e. the date on which the refurbishment factory issues a notice of delivery), if the user complies with this standard and the transportation, installation and operation conditions approved according to the prescribed procedures, if the shaft is found to be non-compliant with the provisions of this standard, the manufacturer must replace it free of charge. Table 2 High temperature electromechanical load test values
JN07201A
JN-07202A
JN-07203A
JN-08005C
JN-09015C
JN10026C
DC rated voltage
Test temperature
DC test voltage
Torsional load
6 Test methods
JB/T 6746.2—93
Except for the test methods specified in this standard, the remaining test methods shall be carried out in accordance with the corresponding provisions of GB775.1. 6.1 Torsion load test
The test piece shall be installed on the testing machine and the test piece shall not be subjected to bending moment. During the test, the load shall be raised to the rated torsional load evenly and without impact. For each test, the load is maintained for 10 seconds. The specimen should not be damaged, the adhesive cracked, or the metal accessories should not have obvious permanent deformation, and there should be no obvious displacement between the components. For the torsional damage negative test, the load is increased until it is damaged. The load at this time is the torsional damage load value.
6.21h high temperature electromechanical load test
The clean and dry specimen is installed in a closed device. The distance between the specimen and the high-voltage electrode and the inner wall of the test machine is not less than one time the dry flashover distance of the specimen. During the test, the specimen should be subjected to bending moment, and the voltage is applied between the two electrodes of the specimen. During the test, the temperature should not be applied in a local heating method that directly heats the shaft, and the temperature is increased to the value specified in this standard at a rate of no more than 100℃/h. Increase the torsional load to 1000N·m at a uniform speed without impact, and then apply the DC (or AC) voltage value specified in the standard, and maintain for 1min without flashover; continue to maintain this mechanical load for 1h, and the specimen should not be damaged. During the entire test process, the operating temperature should be maintained within the temperature range specified in this standard. 7 Inspection rules
7.1 The shaft should be inspected by the quality inspection department of the manufacturer. The manufacturer should ensure that all delivered shafts comply with the provisions of this standard. 7.2 According to the inspection rules specified in this standard, the user has the right to inspect whether the quality and indicators of the shaft comply with the provisions of this standard. 7.3 The shaft should be inspected in batches. The shafts of the same model manufactured by the same process method are considered as a batch, and the quantity of each batch shall not exceed 100. 7.4 The test of the shaft is divided into one-by-one test, sampling test and type test. 7.4.1 One-by-one test
One-by-one test should be carried out in accordance with the provisions of Table 3.
Table 3 Test items one by one
Name of test item
Appearance inspection
Dimension inspection
Ultrasonic flaw detection inspection
Remote torsional load test
7.4.2 Sampling test
Test basis
Article 5.1 of this standard
Article 4.1 of this standard
Article 5.6 of this standard
Article 5.7 of this standard
After passing the tests one by one, two specimens shall be randomly selected and the test shall be carried out in accordance with the provisions of Table 4. Table 4 Sampling test items
Test item name
Dimension and geometric tolerance inspection
Temperature cycle test
Torsional failure load test
Pore gland test
Test basis
Articles 4.1 and 5.5 of this standard
Article 5.9 of this standard
Article 5.8 of this standard
Article 5.2 of this standard
Number of test pieces (pieces)
All after item 2
Porcelain blocks after item 2
Test method Method
JB/Z262
Article 6.5 of this standard
Test method
During the test, if two samples do not meet any of the requirements specified in Table 4, the batch of products shall be unqualified; if one product fails in any item, double the number of samples shall be drawn from the same batch of products for repeated testing. If there is still one sample that does not meet any of the requirements in Table 4, the batch of products shall be unqualified; but if only the size inspection fails, only the size shall be doubled. If it still fails, the manufacturer is allowed to conduct a remote inspection.
7.4.3 Type test
JB/T 6746. 2-93
Type test must be carried out when new products are trial-formed or when the structure, raw material formula and process method of normal products are modified. The number of samples for type test shall not be less than 4, and shall be carried out according to Table 5 after each test is qualified. Table 5 Type test items
Test item name
Appearance inspection
Dimension and geometric tolerance test
Temperature cycle testWww.bzxZ.net
1h high temperature electromechanical load test
Pore rat test
Test basis
Article 5.1 of this standard
Article 4.1.5.5 of this standard
Article 5.9 of this standard
Article 5.10 of this standard
Article 5.2 Articles
Number of test samples (pieces)
All after item 1
After item 2
After item 4
Test method
Article 6.2 of this standard
When conducting type test, even if one test sample does not meet any of the requirements specified in Table 5, the type test shall be unqualified. 8
Marking and packaging
The shaft shall be packed in wooden boxes and ensure that it will not be damaged during transportation due to poor packaging. Its packaging shall refer to the corresponding specifications of JB/Z94. The packaging box shall be marked with:
Manufacturer name;
Product model:
Product quantity;
Total weight of the packaging box;
"Handle with care", "Porcelain" and other words or indication marks. The shaft porcelain part shall have a clear and firm manufacturer's trademark and manufacturing year. Each batch of shafts delivered should be accompanied by a product certificate, which should be stamped by the manufacturer's quality inspection department. Additional notes:
This standard was proposed by the National Technical Committee for Standardization of Insulators. It is under the jurisdiction of the Xi'an Electric Porcelain Research Institute, which is responsible for its interpretation.
This standard was mainly drafted by the Shaanxi Tongchuan Electric Porcelain Motor Factory. The main participants of this standard are the Jiujiang Electric Porcelain Factory.
The main drafters of this standard are Li Musen and Zhao Jincai. The main participants of this standard are Liu Jisheng and Shu Guodong. 16
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