JB/T 8406—2001 This standard is a revision of JB/T 8406—1996 "Low-pressure oil hose for construction machinery". The revised standard is different in the use temperature of the hose, product structure and hose material, and the medium transported by the low-pressure hose. This standard specifies the structure and size, technical requirements, inspection rules, marking, packaging, transportation, storage, and use of high-temperature and low-pressure oil hoses for construction machinery. This standard is applicable to high-temperature and low-pressure oil pipelines in the hydraulic system of construction machinery, and other mechanical products can refer to it. This standard was first issued in September 1996, and this is the first revision. JB/T 8406-2001 High-temperature and low-pressure oil hose for construction machinery JB/T8406-2001 Standard download decompression password: www.bzxz.net

ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T8406—2001
Construction machinery
High temperature and low pressure oil hose
Construction machineryHigh temperatureandlowpressureoil-carryingpipe2001-06-22Released
China Machinery Industry Federation
2001-10-01Implementation
JB/T8406—2001
This standard is a revision of JB/T8406-1996 "Engineering Machinery Low-pressure Oil-carrying Hose". The revision referred to Japanese Industrial Standard JIS K6343-1982 "Rubber Hose for Oil Transport", but this standard has greatly improved the performance of the hose. The main differences are as follows 1. Different operating temperatures of the hose
Engineering machinery products are mainly operated in the field, with harsh environmental conditions, and are often constructed under (-20~+40)℃ conditions. Generally, the return oil pipeline needs to withstand 80℃ high-temperature oil, while the JIS K6343 standard is only applicable to the static indoor temperature of (-15~+45)℃, therefore, it cannot meet the use requirements of engineering machinery.
2. Product structure and hose materials are different
The Japanese standard reinforcement layer uses cloth material, while this standard uses high-grade chemical fiber material, which has greatly improved pressure resistance, strength and service life.
3. The medium transported by low-pressure hoses is different
The JIS K6343 standard is used to transport gasoline, kerosene, diesel, engine oil, etc., while this standard stipulates the transport of hydraulic oil, and its physical properties and test conditions have been greatly improved. The difference between this standard and JB/T84061996 is: 1. The A type and B type specified in the original standard are merged into A type. According to the use temperature requirements, a new B type hose is added. The high temperature aging performance test temperature of the hose layer is increased from 70℃ to 90℃. 1. The name of the standard is changed to "High-temperature and Low-pressure Oil Transport Hose for Engineering Machinery". This standard replaces JB/T8406-1996 from the date of implementation. This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Hebei Jizhou Engineering Machinery Hose Factory. The main drafters of this standard are: Wang Cheng, Chen Jun, Xie Zangzhou, Zhou Defeng. This standard was first issued in September 1996, and this is the first revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Construction Machinery
High Temperature and Low Pressure Oil-Carrying Hose
Construction machinery High temperature and low pressure oil-carrying pipe JB/T8406—2001
Replaces JB/T8406—1996
This standard specifies the structure and size, technical requirements, inspection rules, marking, packaging, transportation and storage, and use of high temperature and low pressure oil-carrying hoses (hereinafter referred to as hoses) for construction machinery. This standard is applicable to high temperature and low pressure oil pipelines of hydraulic systems of construction machinery, and other mechanical products can refer to it. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T528 — 1998 | | tt | | GB/T5311999 | | tt | /T 5562—1985
GB/T5563—1994
GB/T9573—1988
GB/T9575—1988
GB/T 95T7——1988www.bzxz.net
GB/T149051994
HG/T 2185—1991
HG/T3040—1988
3 Structure and dimensions
3.1 Structure
Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber Rubber pocket hardness test method for indentation hardness Determination of adhesion strength of vulcanized rubber or thermoplastic rubber to fabric Test method for liquid resistance of vulcanized rubber
Batch-by-batch inspection Sampling procedure and sampling table by count (applicable to inspection of continuous batches) Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens Rubber hot air aging test Test methods
Physical test methods for rubber hose rubber layer
Hydraulic test methods for rubber, plastic hoses and hose assembliesMethods for measuring the dimensions of rubber, plastic hoses and hose assembliesInner diameter dimensions and length tolerances for rubber, plastic hoses and hose assembliesMarking, packaging and transportation rules for rubber, plastic hoses and hose assembliesDetermination of the bonding strength between the layers of rubber and plastic hosesAppearance quality of rubber hoses
Guidelines for selection, storage, use and maintenance of rubber, plastic hoses and hose assembliesHose is divided into type A and type B according to the ambient temperature and the temperature of the conveying medium. Its working pressure is not more than 1.0MPa. The hose consists of an inner rubber layer, a reinforcement layer and an outer rubber layer, as shown in Figure 1.3.2 Dimensions
Hose dimensions shall comply with the provisions of Table 1.
Approved by China Machinery Industry Federation on June 22, 2001, implemented on October 1, 2001
3.3 Marking Example
JB/T8406—2001
The B-type hose with an inner diameter of 25mm and a length of 1000mm is marked as: Hose B25X1000JB/T84062001
-External rubber
One layer
Inner rubber layer
Figure 1 Hose structure
Table 1 Hose size
Hose inner diameter
Nominal size
Allowed tolerance
Thickness of rubber layer
Inner rubber layer
Outer rubber layer
Hose wall thickness and tolerance
60~100
Note: The thickness of rubber layer, wall thickness and working pressure can also be proposed by the user and produced after the supply and sales parties agree. 4 Technical requirements
Hose cutting
Length and tolerance
Should comply with the provisions of GB/T
9575. If the user has special requirements, the supply and demand parties can implement them by agreement. 4.1 When the hose is subjected to a water pressure test at 2 times the working pressure, it should not leak water, and there should be no local bulging, local expansion and other abnormal phenomena. The bursting pressure should not be less than 4 times the working pressure. 4.2 The physical properties of the hose should comply with the provisions of Table 2. 4.3 The applicable ambient temperature for type A hose is (-25~+45)℃, and the temperature of the hydraulic oil delivered is not higher than 100℃. The applicable ambient temperature for type B hose is (-25~+60)℃, and the temperature of the hydraulic oil delivered is not higher than 120℃. 5 Test methods 5.1 The pressure resistance test shall be in accordance with the requirements of 4.1, and the test method shall be in accordance with the provisions of GB/T5563. 5.2
The tensile test method shall comply with the relevant provisions of GB/T528, GB/T531, GB/T2941 and GB/T5562. 5.3
The oil resistance test method shall comply with the relevant provisions of GB/T1690 and GB/T5562. The aging test method shall comply with the relevant provisions of GB/T3512 and GB/T5562. 5.4
Tear strength
Tear elongation
Performance items
Oil resistance weight gain: No. 120 solvent gasoline at room temperature, 24h aging performance
(90±1)℃×24h
Adhesion strength
Tear strength reduction rate
Tear elongation reduction rate
Adhesive layer and reinforcement layer
Reinforcement layer and reinforcement layer
JB/T8406-2001
Table 2 Physical properties of hose
Note: The physical properties of hoses with inner diameter ≤19mm are not inspected as finished products. Inner rubber layer
≥280
5 The test method for adhesion strength shall comply with the relevant provisions of GB/T532, GB/T14905 and GB/T5562 5.5
5.6 The test method for appearance quality shall comply with the relevant provisions of HG/T2185 5.7 The inspection method of the dimensions of each part and the total length shall comply with the relevant provisions of GB/T9573. 6
Inspection rules
Outer rubber layer
The finished product shall be inspected by the inspection department of the manufacturer in accordance with this standard and the relevant technical documents cited, and shall be accompanied by a product certificate. If there are special requirements for the acceptance rules, the user shall negotiate with the manufacturer. 6.1 Factory inspection
Each hose shall be inspected at the factory, and the inspection items are: a) Appearance quality:
b) Dimensions of each part and total length.
6.2 Regular inspection
The hose shall be tested for physical properties and water pressure once a month. If one of the indicators in the physical property test (or water pressure test) is unqualified, double samples shall be taken from the batch of products and the unqualified items shall be retested. If one of the samples still has one indicator unqualified after the retest, the batch of products shall be unqualified.
6.3 Type inspection
6.3.1 Type inspection shall be conducted every two years, and samples shall be randomly selected from the batch. 6.3.2 Hose samples shall be subjected to appearance quality, water pressure test and various physical performance tests. 6.3.3 The measured values ​​of type inspection shall comply with the product drawings and the provisions of this standard. 6.3.4 The sampling inspection rules for hoses shall be carried out in accordance with the provisions of GB/T2828. This standard selects the following schemes: a) Batch: 500 hoses are produced as a batch: b) Inspection level: General level II:
c) Qualified quality level: AQL-4;
) Strictness of sampling plan: Normal inspection, transfer rules can be used e) Sampling plan type: One-time sampling plan is adopted. 3
Marking, packaging, transportation, storage and use JB/T8406-2001
7.1 If the user has no special requirements, the provisions of HG/3040 and GB/T9577 shall apply. Under the conditions of this standard and GB/T9576 and GB/T9577, the performance of the hose shall comply with the provisions of this standard within a storage period of no more than 12 months.
Republic
Mechanical Industry Standard
Engineering Machinery
High Temperature and Low Pressure Oil Hose
JB/T84062001
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×12301/16 Printing Sheet 1/2
Word Count 10000
First Edition in September 2001
First Printing in September 2001
Print Quantity 1-500
Price 1000 Yuan
2001-142
Mechanical Industry Standard Service Network: http:/kwwwJB.ac.cn00908
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