JB/T 7036-1993 Technical requirements for hydraulic isolation accumulators
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7036-93
Hydraulic isolated accumulator
Published on September 23, 1993
Ministry of Machinery Industry of the People's Republic of China
Technical conditions
Implementation on July 1, 1994
Mechanical Industry Standard of the People's Republic of China
Hydraulic isolated accumulator
1 Subject content and scope of application
Technical conditions
This standard specifies the technical conditions of hydraulic isolated accumulators (hereinafter referred to as accumulators). JB/T 7036-93
This standard applies to accumulators with a nominal pressure of 6.3 to 63MPa, a nominal volume of 0.25 to 250L, an operating temperature of -10 to 70℃, and a petroleum-based hydraulic oil or emulsion as the working medium. 2 Reference standards
GB2352
GB2828
GB3868
GB7935
JB/T5058
JB/T7034
JB/T7035.1
JB/T7035.2
JB/T7037
JB/T7038
JB/JQ20502
JB/ZQ4286
3 Technical requirements
3.1 General technical requirements
Hydraulic isolation accumulator nominal pressure and volume series batch inspection counting sampling procedure and sampling Table (applicable to the inspection of continuous batches) Type and size of pressure-isolated accumulator capsule (type A) Technical conditions of pressure-isolated accumulator Gelsen General technical requirements for hydraulic components
Guidelines for the importance of quality characteristics of mechanical industry products Type and size of hydraulic diaphragm accumulator
Type and size of hydraulic accumulator type A
Type and size of hydraulic bladder accumulator Type and size of AB type hydraulic isolation accumulator Test method
Technical conditions of hydraulic isolation accumulator shell Internal cleanliness test method of hydraulic components Part II Weighing method (trial) General technical conditions for packaging
3.1.1 The nominal pressure and nominal volume series of the accumulator shall comply with the provisions of GB2352. 3.1.2 The type and size of the accumulator shall comply with the provisions of JB/T7035.1JB/T7035.2, JB/T7034. 3.1.3 The type and size of the accumulator capsule shall comply with the provisions of GB3867.1. 3.1.4 After the factory test, the accumulator capsule shall retain nitrogen at a pressure of 0.05~0.15MPa. 3.1.5 General technical requirements for accumulators In addition to the provisions of this standard, they shall comply with the provisions of Chapter 1 of GB7935. 3.2 Performance in use
3.2.1 Capsule air tightness; fill the capsule with 0.85 times the nominal pressure of rat gas (or air), maintain the pressure for 12 hours at ambient temperature, and no leakage is allowed. 3.2.2 Accumulator sealing: During the accumulator sealing test, the sealing parts shall not be slippery or leak oil. 3.2.3 After the accumulator has been repeatedly operated for 100,000 times, the drop in the inflation pressure shall not be greater than 10% of the pre-charge pressure value, and no oil shall leak from the sealing parts.
After the accumulator has been repeatedly tested for 100,000 times, it shall be checked by sea air. The oil inlet shall not leak and the pressure indication value of the pressure gauge shall not drop.
Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
JB/T7036-93
3.2.5After the accumulator has been repeatedly tested for 100,000 times, it shall be checked by oil leakage. The oil leakage at the wide seat of the capsule charging valve shall not exceed the specified value in Table 1.
Nominal volume L
Oil mixing amount (drops)
100~250
After the accumulator is disassembled and inspected, the capsule shall not have peeling, swelling, cracking and aging. All parts shall not be damaged and the matching accuracy shall not be reduced. After the cleanliness inspection, the mass of dirt inside the accumulator shall not exceed the specified value in Table 2. Table 2
Nominal volume L
Dirty mass mg
Nominal passenger volume L
Dirty mass mg
The physical and mechanical properties of the accumulator capsule shall comply with the provisions of Table 3. Table 3
Shore A hardness
Tear strength
Tear elongation
≥400
Tear deformation
3.3 The technical requirements of the accumulator shell shall comply with the provisions of JB/T7038. 3.4 The technical requirements of the accumulator capsule shall comply with the provisions of GB3868. 3.5 Processing quality
Weight change
After 48h in N32 hydraulic oil at 70°C
-10～+5
After 72h in N10 water bag oil at 70°C
—5~+10
According to JB/T5058, the importance level of processing quality characteristics is divided. Key characteristics (A level) qualified quality level AQL value is 1.0 Important characteristics (B level) qualified quality level AQL value is 6.5.3.6 Safety requirements
3.6.1 Accumulators with a nominal volume greater than or equal to 10L should be equipped with a safety valve, whose discharge capacity must be greater than or equal to the accumulator discharge volume, and the opening pressure must not exceed the design pressure of the accumulator. 3.6.2 The accumulator must be subjected to a pressure test before leaving the factory, and there must be no leakage or oil seepage. 3.6.3 The accumulator shall comply with the relevant provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" in terms of material selection, design, and manufacturing. 3.7 Assembly process requirements
3.7.1 The assembly site should be clean.
3.7.2 Before assembly, each component should be strictly cleaned and inspected piece by piece. No impurities or dirt should be left on the inner surface of the shell, and no scratches or scratches should be left on the outer surface of the rubber. The surface of the parts that have passed the re-inspection shall be cleaned with engine oil, and the tested capsules shall be filled with gas (nitrogen or air) and immersed in the water phase for air tightness test. The surface of the qualified capsules shall be cleaned and hung in a special site. They shall not be placed randomly or folded. 3.7.3 Oil inlet valve assembly
The assembled oil inlet valve shall move flexibly and reliably in the valve body, and no jamming is allowed. The inclined surface of the valve body shall match well with the inclined surface of the valve body, and no deflection is allowed.
3.7.4 Capsule assembly
JB/T7036-93
Install the inspected O-ring into the sealing groove of the inflatable seat pressed together with the capsule. 3.7.5 Overall assembly
Put the shell on the assembly table, and apply a layer of hydraulic oil film with a filtration accuracy of 20\ on the inner wall of the shell. The capsule slowly enters the shell from the large mouth end. It is not allowed to scratch the surface of the capsule, and it is not allowed to cut the O-ring on the inflatable seat. The bottom of the capsule should be concave to avoid folding at the bottom. Then send the oil inlet valve group into the shell from the large mouth end. Then send the rubber ring and the support ring into the shell respectively, and guide the valve body to reset. The body should not damage the whole body of the shell.
3.7.6 The assembled accumulators are placed on the product rack according to the specifications for factory inspection. 3.7.7 The accumulators that have passed the factory inspection should be accompanied by a certificate of qualification and mark issued by the inspection department. 3.8 Assembly quality requirements
3.8.1 Parts are not allowed to have defects such as burrs, magnetic damage, scratches, rust, etc. The internal cleanliness requirements of the components shall comply with the provisions of Article 3.2.7. 3.8.2 The sealing enclosure is not allowed to have defects such as cutting edges. 3.8.3 Assembly accuracy shall comply with the requirements of the drawings.
3.9 Appearance quality requirements
3.9.1 The shell surface shall be smooth and round, and shall not have defects such as folds, obvious waves, cracks, etc. The paint color is flat, smooth and beautiful. 3.9.2 The exposed parts are treated with rust prevention and the color is coordinated. 3.10 Other requirements shall be in accordance with the contract.
4·Test method
The test method of the accumulator shall comply with the provisions of JB/T7037. 4.1
4.2 The test method of the accumulator shell shall comply with the provisions of JB/T7038. 4.3 The test method of the drop accumulator capsule shall comply with the provisions of GB3868. 4.4 The internal cleanliness test method of the accumulator shall comply with the provisions of JB/JQ20502. 5 Inspection rules
5.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. Factory inspection refers to the various inspections that must be carried out when the product is delivered. Type inspection refers to the inspection that should be carried out to comprehensively assess the product quality. In any of the following situations, type inspection must be carried out: Finalization identification of new products or old products transferred to the factory for production: a.
When there are major changes in structure, materials, and processes that may affect product performance: When production is resumed after a production interruption of more than one year; c.
When the factory inspection results are significantly different from the last type inspection: When the national quality supervision agency proposes to conduct a type inspection. e.
5.2 Sampling
The sampling plan for batch products shall be in accordance with the provisions of GB2828. 5.2.1Qualified quality level (AQL value): 4.0. The qualified quality level (AQL value) of parts processing quality is in accordance with Article 3.5. 5.2.2 Inspection level and sampling plan type: special inspection level S-3, one normal sampling plan. 5.2.3 Number of samples: The number of sample samples for product sampling is in accordance with Table 4. The inspection batch for parts processing quality inspection sampling is 26 to 50 units (pieces), and 3 units (pieces) are randomly sampled.
5.3 Judgment rules
One sampling plan for batch production products:
According to the sample inspection results, if the number of unqualified (unqualified products) found in the sample is less than or equal to the qualified judgment number, it is judged as qualified: if the number of unqualified (unqualified products) found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 3
Number of sampleswwW.bzxz.Net
Note, when the batch is greater than 150, it shall be in accordance with the relevant provisions of GB2828. 6 Marking, packaging, storage and transportation
6.1 Marking
JB/T7036-93
6.1.1In addition to the steel stamp on the accumulator shell, a metal nameplate should be set at the end of the charging valve. The content of the nameplate is as follows:
Name:
Model:
Main technical parameters:
Graphical symbols;
Manufacturer name:
Year and month of production.
The data on the chrome plate and the shell steel stamp should be clear and complete. 6.1.2
6.2 Packaging
Accumulators should be packed in boxes. According to the product's external dimensions, the packaging can be one piece per box or multiple pieces per box. 6.2.1
Before packing, all connectors should be tightened, and dust plugs should be added to each oil port. The exposed parts should be cleaned and anti-rust oil should be applied. Put the product into a plastic bag, seal it, and then put it into the box and fix it firmly. 6.2.3
The instruction manual, certificate of conformity, and spare parts should be packed together with the product. Seal the documents and spare parts packed together with the plastic bag and fix them in the bag. 6.2.4
Fix the two ends of the packaging box with steel belts to prevent the box from breaking during lifting. 6.2.5
6.2.6The outside of the packaging box should be marked with: manufacturer name, product name, model, number of pieces, weight, outer packaging size, destination and receiving unit. It should also be marked with patterns and words such as moisture-proof, rain-proof, warm and sun-proof, and careful to scatter. 6.2.7For other packaging requirements, please refer to JB/ZQ4286. 6.3 Transportation
The accumulator should be loaded and handled with care during transportation. It is strictly forbidden to throw, slide or other methods that are likely to cause impact, and electromagnetic handling is also prohibited. 6.4 Storage
6.4.1 The accumulator should be placed horizontally and neatly to prevent rolling and bumping. 6.4.2 It is strictly forbidden to expose to the sun, moisture, rain and contact with corrosive gases. Additional remarks:
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. This standard was drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie and Hong Yanhong. 4
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