This standard specifies the technical requirements, test methods, inspection rules and product marking, packaging, transportation, storage, etc. of pneumatic pipe joints. JB/T 7056-1993 General Technical Requirements for Pneumatic Pipe Joints JB/T7056-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7056-1993
Pneumatic Pipe Fittings
General Technical Conditions
Published on September 23, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1994
Mechanical Industry Standard of the People's Republic of China
Pneumatic Pipe Fittings
General Technical Conditions
Subject Content and Scope of Application
JB/T 70561993
This standard specifies the technical requirements, test methods, inspection rules and product marking, packaging, transportation, storage, etc. of pneumatic pipe fittings. This standard applies to plug-in type, ferrule type and other pneumatic pipe fittings (hereinafter referred to as fittings) with compressed air as the working medium. Cited standards
GB2351
GB7932
GB7937
GB/T14513
JB/JQ207017
Hydraulic and pneumatic systems and componentsHose nominal inner diameter seriesGeneral technical conditions for pneumatic systems
Hydraulic and pneumatic pipe joints and accessories
Determination of flow characteristics of pneumatic components
Pneumatic Technical conditions for packaging of pneumatic components
3 Product classification, symbols and codes
3.1 Classification
3.1.1 Pneumatic pipe joints are classified according to the structural type: plug-in pneumatic pipe joints;
card sleeve pneumatic pipe joints;
cone locking pneumatic pipe joints;
clamp pneumatic pipe joints;
quick-change pneumatic pipe joints;
speed-adjusting pneumatic pipe joints.
3.1.2 Pneumatic pipe joints are classified according to their functions:
nominal inner diameter series
ordinary pipe joints: pipe joints used to connect various components and pipes in pneumatic systems; functional pipe joints: pipe joints that not only connect pipelines in pneumatic systems, but also have certain adjustment and control functions. 3.2 Symbols
Pneumatic pipe joints can be represented by general drawing methods plus classification feature elements or codes (see Table 1). 3.3 Code
The codes for the categories, series and varieties of pneumatic pipe fittings are shown in Table 2. Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
Name of pneumatic pipe fittings
Pneumatic pipe fittings (general drawing method)
Insert pipe fittings
Compression fittings
Cone locking pipe fittings
Clamp fittings
Quick-change pipe fittings (without check valve)
(with check valve)||tt ||Speed-adjustable pipe joint
Pneumatic pipe joint classification name
Insert type
Card sleeve type
Cone locking type
Clamp type
Quick change type
Speed-adjustable type
4 models
Pneumatic pipe joint model representation method:
JB/T70561993
System name
Straight-through plate
× ××××-××
Connection representation
Product name
Intermediate terminal
Long terminal
Marking example:
JB/T70561993
Manufacturer code (or standard number)
Specification (nominal diameter)
Product code
Series code
Classification code
Pneumatic pipe fittings
Pneumatic pipe fittings, plug-in type, right-angle terminal, 96 diameter:. QJA24Z6××
5 Technical requirements
5.1 Working conditions
5.1.1 The working medium is dehydrated and filtered air. 5.1.2
The medium temperature and ambient temperature range is 5~60℃. 5.1.3
Relative humidity of working environment shall not exceed 85%.
Nominal pressure classification shall comply with the provisions of Table 3.
Nominal pressure
5.2 Performance
5.2.1 Flow characteristics
The flow characteristics of the joint are expressed by the effective cross-sectional area, which shall not be lower than the provisions of Table 4. Table 4
Nominal diameter mm
Effective load area mm2
5.2.2 Leakage
The joint shall not have leakage and other abnormal phenomena within the nominal pressure range. 5.2.3 Pressure resistance
≥190
After the joint is subjected to a 1-minute pressure resistance test at 1.5 times the nominal pressure, there shall be no leakage, cracking, deformation or other damage. 5.2.4 Pull-out strength
The pull-out strength of the joint shall not be lower than the requirements of Table 5. After pulling, the test piece and the piping shall not leak. Table 5
Nominal diameter
Tensile force
Reliability
Pneumatic pipe joints shall be tested for reliability.
5.2.6 Repeated assembly and disassembly
JB/T7056-1993
After repeated assembly and disassembly of pneumatic pipe joints for 5 times, there shall be no leakage or other abnormal phenomena. 6 Manufacturing requirements
6.1 Parts processing
6.1.1All parts of pneumatic pipe joints shall be manufactured according to the specified drawings and process documents. The materials of all parts shall comply with the requirements of the drawings, and the performance of the materials shall comply with the relevant standards. 6.1.2
The machined surface of the parts shall not have rust, scratches, bumps, roughness, burns, cracks and defects that affect the appearance. The surface treatment and heat treatment of castings, die castings, plastic parts and parts shall meet the relevant standards or technical requirements. 6.2 Assembly
Assembly must be carried out in accordance with the requirements of the drawings and technical documents. 6.2.1
Parts that fail the inspection shall not be used for assembly, and purchased parts must have a certificate of conformity. If the seal has scratches, strains, cuts, aging and other phenomena that affect the quality of the pneumatic pipe joint, it shall not be used for assembly. 6.2.4
Before assembling the parts, the burrs shall be removed and the parts shall be cleaned. The cleanliness of the products shall meet the requirements of relevant standards. 6.2.5
The seams between the assembled parts shall be smooth.
6.3 Appearance quality
The appearance of the joint shall be smooth, without harmful scratches, cracks, burrs and other defects. 7 Test method
7.1 Test conditions
7.1.1 Test environment temperature: 20±15℃. 7.1.2 Compressed air for test: filtration accuracy 50~75um, water separation efficiency not less than 80%. 7.2 Installation of test pieces
7.2.1 The test pieces for leakage test, pressure resistance test, repeated assembly and disassembly test and pull-out strength test shall be installed as shown in the figure below. Test joint
Pressure source
7.3 Test device
The test device shall be equipped with pressure relief and explosion-proof systems to ensure the safety of the test. The system error of the measuring instruments shall be in accordance with the provisions of Table 6. Test joint
Measurement level
Pressure%
7.4 Test items
7.4.1 Flow characteristic test
The test method shall be carried out in accordance with the provisions of GB/T14513. 7.4.2 Leakage test
JB/T7056—1993
The test piece is installed according to Article 7.2, the gas pressure is the nominal pressure, the pressure is maintained for 5 minutes, and no leakage shall occur. Note: It is recommended to use the method of immersing the test piece in water to collect bubbles. 7.4.3 Pressure test
The test piece is a product that has passed the leakage test. It is installed according to Article 7.2, the gas pressure is increased to 1.5 times the nominal pressure, and the pressure is maintained for 1 minute. No leakage or damage shall occur.
7.4.4 Pull-out strength test
The test piece is installed according to Article 7.2, and the pipe L=100mm. The test is carried out on a constant speed tensile testing machine. The tensile force should not be less than that specified in Table 3, and the tensile force should be stretched at a speed of 200mm/min, which meets the requirements of Article 5.2.4. 7.4.5 Appearance quality inspection
Appearance quality inspection shall be conducted by visual inspection and touch, and shall comply with the provisions of Article 6.3. 8 Inspection rules
The inspection of joints is divided into factory inspection and type inspection. 8.1 Factory inspection
Factory inspection is divided into mandatory inspection and random inspection. Each product can only be shipped after being inspected and qualified by the quality inspection department of the manufacturer and accompanied by a certificate of conformity.
8.1.1 Inspection items
The mandatory inspection items for shipment shall be carried out in accordance with Articles 7.4.2 and 7.4.5 of this standard, and the random inspection items shall be carried out in accordance with Article 7.4.3. 8.1.2 Inspection quantity
Sampling shall be conducted from the products that have passed the inspection and entered the warehouse of the manufacturer. Each mandatory inspection item shall be inspected. For random inspection items, the quantity shall be 2% of each batch but shall not be less than 3 items.
8.1.3 Judgment rules
When one of the indicators of the mandatory inspection items does not meet the requirements, the product is judged to be unqualified. When all the mandatory inspection and random inspection items meet the requirements, the product is judged to be qualified. If there are unqualified items in the random inspection items, the unqualified items should be double sampled and inspected in the same inspection batch. If all the re-inspected products meet the requirements, the products except those that failed the first inspection are judged to be qualified. If there are still unqualified products after the re-inspection, the products shall be inspected piece by piece. 8.2 Type inspection
When any of the following situations occurs, the product shall be subjected to type inspection. a. When a new product is trial-produced or an old product is transferred to another factory for production; JB/T70561993
b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, inspections shall be carried out regularly, with the interval not exceeding 3 years; d. When the product is resumed after a long period of suspension; e. When there is a significant difference between the factory inspection results and the last type inspection; f. When the national quality supervision agency proposes a requirement for type inspection. 8.2.1 Inspection quantity
The number of samples for type inspection shall not be less than 2, and a full inspection shall be carried out. 8.2.2 Judgment rules
If all the samples meet the requirements, the batch of products is considered to have passed the type inspection. If one of the performance of the samples is unqualified, the item shall be doubled for re-inspection. If all the samples meet the requirements, the batch of products is still considered to have passed the first inspection except for those that failed. If there are still unqualified samples in the re-inspection, the batch of products is considered to have failed the type inspection. 9 Marking, packaging, transportation, storage
9.1 Product marking
Each product shall be marked with the following:
a. Manufacturer name or code;
b. Product model or mark.
Packaging and transportation
Packaging shall be in accordance with the provisions of JB/TQ207017. It shall be ensured that the product will not be damaged during normal transportation. The outer surface of the packaging box shall be marked with:
a. Manufacturer name and address;
b. Product name and model;
c. Quantity, gross weight and external dimensions;
d. Receiving unit and address;
e. "Handle with care", "Pressure-proof", "Pressure-proof" and other signs; f. Date of manufacture.
Random documents
Instruction manual;
b. Product certificate;
c. Packing list.
9.2.4 Storage
Should be stored in a ventilated, dry warehouse without corrosive contamination. Additional notes:
This standard is proposed and managed by Wuxi Pneumatic Technology Research Institute. This standard was drafted by Fuxin General Pneumatic Accessories Factory, Liaoning Province. The main drafters of this standard are Wang Jinchun and Li Yingwu. 6
People's Republic of ChinabzxZ.net
Mechanical Industry Standard
General Technical Conditions for Pneumatic Pipe Fittings
JB/T70561993
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Format 880×1230
Postal Code 100044)
1/16 Printing Sheet 3/4
Word Count 12,000
First Edition in May 1994
First Printing in May 1994
Price 6.00 Yuan
Print Quantity 1-500
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_90
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