Some standard content:
Chemical Industry Standard of the People's Republic of China
HG 2331-92
Capsule for hydraulic isolated accumulator
Published on 1992-06-01
Ministry of Chemical Industry of the People's Republic of ChinawwW.bzxz.Net
Implemented on 1992-07-01
Chemical Industry Standard of the People's Republic of China
Capsule for hydraulic isolated accumulator
HG 2331 —92
，Subject content and scope of application
This standard specifies the classification, technical requirements, test methods, inspection rules, packaging, storage, etc. of rubber capsules for isolated accumulators in hydraulic and pneumatic systems (hereinafter referred to as capsules). This standard is applicable to hydraulic isolated accumulator rubbers whose working medium is petroleum-based hydraulic oil or emulsion and whose operating temperature is -10 to 70°C.
2 Reference standards
Ordinary thread tolerances and fits (diameter 1 to 355mm) GB197
GB528 Determination of tensile properties of vulcanized rubber
GB/T529 Determination of crack strength of vulcanized rubber (trouser-shaped, right-angled and crescent-shaped specimens) GB 531
GB 1682
GB1688
Test method for Shore A hardness of rubber
Test method for brittle temperature of vulcanized rubber
Determination of elongation fatigue of vulcanized rubber
Test method for liquid resistance of vulcanized rubber
GB1690
GB 3512
GB5721
GB5722
GB6031
GB6032
GB 7759
GB 9865
Test method for hot air aging of rubber
General provisions for marking, packaging and transportation of rubber sealing productsGeneral provisions for storage of rubber sealing products
Determination of international hardness of vulcanized rubber (30-85 IRHD)Determination of international hardness of vulcanized rubber (30-85.IRHD)Conventional test method
Micro test method
Determination of fixed deformation and compression set of vulcanized rubber at room temperature and high temperaturePreparation of vulcanized rubber samples and test specimens
Determination method for bond strength of vulcanized rubber to metal-Tensile method GB 11211
3.1 Structure and dimensions
The structure of the energy-saving rubber is shown in Figure 1, and the main dimensions of the rubber are listed in Table 1. The thread dimensions comply with the provisions of GB197. Approved by the Ministry of Chemical Industry of the People's Republic of China on 1992-06-01 and 1993-07-01, actual photo
HG 2331—92
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3.2 Marking
HG 2331 — 92
Use Chinese pinyin initials and numbers to mark the product, that is, "name, capacity × length, standard number" Example:
4 Technical requirements
0. 4× 74
HG 2231
Standard No.
-Capsule body length (Lg), mro
Basic volume of capsule, dm3
Encapsulator rubber wing
The type, main dimensions and tolerances of rubber shall comply with the requirements of rate 1 and table 1. The wall thickness of rubber shall comply with the specifications of the specific drawing. 4.1
The physical properties of the rubber used for capsule shall comply with the requirements of table 2. 4.2
Hardness (compression hardness or Shore A hardness), tensile strength, MPa
Tensile elongation, %
Compression set (70℃ × 22 h), % Durability (pulling the child according to 100% of the working torque), Wanqiu low temperature running performance (-30℃)
Hot air aging (100℃×70h) The rate of change of the clock length is reduced, % No. 1 standard oil (100℃×70h) Volume change rate, % No. 10 water-in-oil (M-10 emulsion) (70×70h) Rest area change rate, % Tear strength, kN/m
Rubber and 45 steel bonding strength, MPa
-12~+s
-5~+10
HG2331- 92
4.3 The physical properties of the rubber shall conform to the requirements of Table 3. However, for rubber with a base volume not exceeding 2.5dm3, only hardness and liquid resistance tests shall be performed.
Hardness (international hardness or Shore A), tensile strength, MPa
Elongation at break, %
Volume change of No. 1 standard oil (100℃×70h), %Volume change of No. 10 water-in-oil (70℃×70h), % +5
-5~+10
4.4 The outer surface of the capsule shall be smooth, and the thread shall not be damaged or rusted. Its appearance defects shall comply with the provisions of Table 4. Table 4
Appearance defects
Debonding of rubber and metal
Spongy
Mold misalignment
Model traces
Not allowed
Capsules larger than 0.2mm and smaller than 10dm are not allowed, and no more than 3 places; capsules equal to or larger than 10dm, no more than 5 places||tt| |Not allowed to be larger than 0.3mm
Slight marks are allowed
No bubbles are allowed on the surface of one-third of the length of the glue from the tail end: bubbles no larger than 1.5mm are allowed on the surface of the other two-thirds of the length of the capsule, and the depth is not allowed to exceed the tolerance of the wall thickness. The number of bubbles is not allowed to exceed 3
Allowed to exist, and the lower limit is not allowed to exceed the tolerance of the wall thickness. On the surface of 25cm\, no more than 2 places are allowed, and no more than 5 places are allowed for the entire glue load
45 In the airtightness test of the capsule, no leakage is allowed. 4.6 Durability (life) test of rubber magic; under the specified conditions, after three test stages, namely high temperature 1000 times, impact 50 (autumn and reciprocating action 100,000 times, there is no crack, no stickiness, and the accumulator inflation pressure drop rate shall not exceed 9%. 5 Test method
51 Determination of crushing strength, according to GB.6031 or GB6032 or GB531, GB6031 and GB6032 are arbitration methods, 5.2 Tensile strength, determination of elongation at break, according to GB528, 5.3 Determination of compression permanent deformation, according to GB7759, 5.4 Test of low moisture content, according to GB1682. 5.5 Determination of tear strength, according to GB/T529, using a right-angled specimen. 5.6 Determination of elongation fatigue, according to GB1688. HG 2331 92
5.7 Determination of the strength of rubber and No. 45 shall be in accordance with GB11211. 5.8 Hot air aging test shall be in accordance with GB3512. 5.9 Liquid resistance test shall be in accordance with GB 1G90. 5.10 Preparation of test specimens shall be in accordance with GB9865. For the tensile properties of rubber with a basic capacity equal to or greater than 4dm2, samples shall be taken along its axial direction.
5.11 Appearance of rubber shall be measured by visual inspection or with a measuring tool with a graduation value of 0.02mm. 5.12 Size of capsules, M and 5 shall be measured with a graduation value of 0.02mm. The L value is measured by a measuring tool with a graduation value of 0.1 mm. When the secretion volume is 5, at least three places in different parts are measured and the average value is calculated. The difference between the maximum and minimum values is 45. L is measured by a tool with a graduation value of 0.1 mm and L is measured by a measuring tool with a graduation value of 0.5 mm. The average value of at least 3 measured values is taken as the result. The R value is generally not tested. It is negotiated by both parties and verified by the actual size of the model.
5.13 The air tightness test of the capsule is to fill the capsule with nitrogen or air with a pressure equal to or less than 0.05 MPa: fill it into the water tank to check for leaks, or apply soapy water on the entire surface of the rubber hair for inspection. The capsule is not allowed to leak. 5.14 The durability test of the capsule is carried out on a special test bench with reference to the relevant conditions specified in Appendix A. The reciprocating action test is carried out every 1 time to check the original inflation. The pressure drop rate shall not exceed 1%. For 10 consecutive cycles, the total pressure drop shall not exceed 9% for a total of 100,000 times.
6 Inspection rules
6.1 Factory inspection
6.1.1 The appearance and air tightness of the rubber shall be inspected piece by piece. 6.1.2 The physical properties of the capsule and its rubber compound shall be inspected for sampling. 6.1.2.1 The rubber compound shall be batched with the production volume of the same shift and the same machine. One sample shall be taken from each batch. The inspection items shall be silicon content, tensile strength, elongation at break, tensile fatigue, low temperature brittleness, hot air aging, compression permanent deformation, and liquid resistance (either No. 1 standard oil or No. N10 water-in-oil)
6.1.2.2 The tear strength of the rubber compound and the bonding strength between rubber and No. 45 steel shall be inspected at least once every six months. 61.2.3 If one physical property does not meet the requirements of Table 2, it is allowed to take double samples to re-test the unqualified items. If it still fails, the rubber compound of the batch or period is unqualified, and the capsules produced with this rubber compound should also be unqualified. 6. 1.2.4 Capsules are made of the same rubber compound, manufactured in the same period and delivered at one time as a batch. Take one sample from each batch to test its hardness, tensile strength, elongation at break and liquid resistance (either No. 1 standard oil or No. N10 water-based oil). If one of the items does not meet the requirements of Table 3, it is allowed to re-test once. If it still fails, the batch of capsules is unqualified. 6.1.3 The size and male stem (M, 5, Lo, L, etc.) of the capsules are inspected. The same specification products are considered as a batch. Three products are inspected in the batch. If one size or tolerance fails, the product is unqualified. If two products fail, the batch of capsules is unqualified. 6.2 Type inspection
6.2.1 All technical requirements specified in this standard shall be inspected. 6.2.2 The durability inspection cycle shall be agreed upon by the supply and demand parties. 7 Marking, packaging, transportation, storage
Marking, packaging, transportation, shall comply with the relevant provisions of GB5721. 7.1
7.2 Each capsule shall be individually packaged and packed into a suitable packaging box according to the specifications. 7.3 The threaded part of the capsule shall be properly protected. 7.4 Storage shall comply with GB5722.
7.5 During the packaging, transportation and storage of the capsule, a certain amount of nitrogen (to ensure that the capsule is bulging) shall be filled. 7.6 Under the above conditions, the storage period of the capsule is two years. 5
HG 2331—92
Appendix A
Hydraulic accumulator bladder durability (life) test conditions (reference)
The durability test conditions of accumulator rubber are shown in Qiu A1. Table A1
Test phase
Additional instructions:
Nominal pressure
Inflating pressure
Actuating pressure
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry, and this standard is drafted by the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Su Guirong, Lai Yongzhi, Peng Xianze, and Wang Ying. Charge and discharge frequency
Reciprocating number
100000
From the date of implementation of this standard, the original national standards GB3867.183 "Hydraulic isolation accumulator (type A) type and size" and GB3868-83 "Hydraulic isolation accumulator accumulator technical conditions" are used as the reference standard of the People's Republic of China
Chemical industry standard
Capsule for hydraulic isolation accumulator
HG 2331 —92.
Editor: Chemical Industry Standards Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry):
Postal Code: 100013
Printer: Standardization Research Institute of the Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Booklet name: 80×12301/16 Number of words on a sheet: 12000 First edition: December 1992 First printing: December 1992 Number of copies: 1—500
Cost: RMB 2.50
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