JB/T 9869-1999 This standard is a revision of ZB J93 001-87 "Technical Conditions for Exhaust Mufflers of Internal Combustion Engines for Construction Machinery". During the revision, editorial changes were made according to relevant regulations, term definitions were added, and vibration test and inspection rules were revised. This standard specifies the technical requirements, test methods, inspection rules, packaging and storage of exhaust mufflers of internal combustion engines for construction machinery. This standard is applicable to exhaust mufflers of internal combustion engines for construction machinery. This standard was first issued on April 4, 1987. JB/T 9869-1999 Technical Conditions for Exhaust Mufflers of Internal Combustion Engines for Construction Machinery JB/T9869-1999 Standard download decompression password: www.bzxz.net

Ics 53.100
Machinery Industry Standard of the People's Republic of China
JR/T9869—1999
Construction machineryExhaust silencers of internal combustion engines--Technical specifications1999-08-06Promulgated
State Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T98691999
This standard is a revision of ZD39 "Technical specifications for exhaust silencers for internal combustion engines of construction machinery": During the revision, major changes were made to the original standard, the definition of the technology was added, and the vibration test and inspection rules were adopted. This standard replaced ZBJ93001—87 from the date of implementation. This standard contains 1 mechanical standardization technology. The drafting units of this standard are: Tianlu Engineering Machinery Research Institute, Shanghai Zihua Internal Combustion Engine Parts Factory, and Bei'an Xinxian Duanqing Duan Factory. The authors of this standard are: Chang Chengshan, Wu Daoqiu, Fang Lianguo, and Li Jiazeng. This standard was first issued on April 4, 1987. 1 Scope
Mechanical Industry Standard of the People's Republic of China
Exhaust Mufflers for Internal Combustion Engines for Engineering Machinery
Technical Conditions
Consiructin nachineryFxhaus1silencers ninternalcombustion-Teehnteal speeifleatlollsIB/T 9869-t999
7.BJ93001-3
This standard specifies the technical requirements, test methods, inspection rules, packaging and storage of exhaust mufflers for internal combustion engines for engineering machinery. Standard applies: 1. Exhaust mufflers for micro-engines (hereinafter referred to as muffler groups 2
Cited standards
The provisions contained in the following standards constitute the provisions of this standard through the use of numbers in this standard. When this standard is published, the version requested is effective. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the following standards. GA/T 282X,-[957
GR/T17591995
50188199
3 Terms
: The following definitions are used in this technical description.
3.1 Exhaust silencer
Batch inspection set counting sample procedure effective sample table (applicable to the following reverse batch inspection internal combustion engine exhaust muffler test method
engineering machine propulsion diesel engine can carry, durability test method sticky exhaust muffler is a device with sound absorbing village or special form of air flow duct, which can effectively reduce the air flow noise: Note. Internal combustion engine exhaust muffler is the entire muffler component from the attached air intake knife to the air package plate, excluding the internal combustion engine 3.2 Insertion loss
The insertion loss of the muffler is the difference in sound power level radiated by the exhaust gas before and after the installation of the muffler. Symbol: D: Unit: dB. Juice: 4 In this case, the size, shape, and sound field of the pipe mouth remain approximately the same. At this time, the insertion loss is equal to the difference in sound power level before and after the installation of the muffler at a given measuring point.
3.3 Power loss ratio
The power loss ratio of the muffler is the percentage of the difference in the dynamic range before and after the use of the muffler and the average power value when the muffler is not used under the calibrated working conditions of the internal combustion engine. Symbol: factory.
4 Technical requirements
4.1 The equipment for muffler shall be in accordance with the regulations The drawings and technical documents approved by the program shall be made in accordance with the provisions of this standard. 4. When the muffler is changed and its performance and installation dimensions are involved, it shall be negotiated with the ordering unit and a consensus is reached before it can be carried out. 4.3 The loss of the muffler (D and the period of operation shall comply with the provisions of the table! Approved by the State Machinery Industry Bureau on August 16, 1999 and implemented on January 1, 2000
J819869-1999
Reduced loss D
>15-20
Land rate lock ratio exchange
Three: The muffler is divided by the size of the system D. The design or selection of the muffler can be based on the exhaust gas and the general concept of the program. The membrane source should be reasonably selected according to the industry requirements. 4.4 Muffler: The surface emission noise should be reduced to the exhaust noise. 4.5 The muffler should be subjected to vibration test in accordance with the provisions of 5.3. After the test, the muffler shall not be loose, leaking or deformed. .6 After the vibration test, the muffler shall be subjected to air tightness test at a force of 200kP for 1m. At this time, the appearance, joints and windings of the muffler shall not have any deflection beyond the requirements of the product drawings. 4. The impact muffler shall be subjected to durability test in accordance with the provisions of 5.4. After the test, the muffler shall not have cracking, abnormal sound, and the reduction after insertion shall not be greater than 3 (A, and the increase in dynamic loss ratio shall not be greater than %. 4.8 Components and connecting parts shall comply with the provisions of relevant standards. 4.9 According to the requirements of the supply, the exhaust port of the muffler can be equipped with a rainproof, fireproof and explosion-proof cap. If necessary, a drainage hole should be added at the appropriate position of the muffler body.
4.10 According to the requirements of the application, the muffler can be equipped with an exhaust ejector, but it must be ensured that no air will flow back into the air filter under any working condition of the internal combustion engine:
4.11 The surface of the material used for the muffler should be smooth and free of rust or other defects. 4.12 The outer surface of the muffler should be bright and flat, and should be treated with anti-rust treatment, such as high temperature resistant polyester, porcelain or aluminum spraying, etc. The outer shell can also be made of aluminum plating.
413 During the warranty period of the internal combustion engine, the muffler should not have leakage, air leakage exceeding the rated value or abnormal sound, and the loss ratio should not exceed 3 (A). The increase in the absorption loss ratio should not exceed %5. Test method bzxz.net
5. 1. Elasticity test
The performance test shall be carried out in accordance with the provisions of GBT4759, and the following parameters shall be determined as the main indicators of the price of silencers: a. The insertion loss of the silencer
The dynamic loss ratio of the silencer.
5.2 The surface radiation of the silencer shall be determined in accordance with the provisions of GBT4759, and its star rating shall comply with the provisions of 4.4. 5.3 Dynamic test
The silencer is installed in a vibration test machine in a state of use (or close to use): The vibration test includes resonance test and vibration resistance test. 5.3.1 Resonance test
The muffler shall be subjected to resonance test according to the provisions of Table 2. First, the dynamic frequency of the muffler shall be turned on from 8.3Hz, and then continuously increased to 50Hz at the same ratio; then continuously reduced to 0.3Hz at the same ratio to find the resonance frequency of the muffler. 5.3.2 Vibration resistance test
If there is no resonance frequency, the muffler shall be subjected to the resistance test according to the provisions of Test 3. If there is no resonance frequency, the muffler shall be subjected to the vibration test according to the provisions of Test 4. When the muffler has two or more resonance frequencies, the main resonance frequency shall be selected. Table 2 According to the driving frequency, the driving frequency, vibration problem, and its illumination rate are as follows: 5.4 Durability test Driving acceleration Driving acceleration Driving acceleration Driving time Vibration time The muffler can be tested with the matching machine according to the provisions of JBT501B8 and any one of the following can be carried out: a) bench durability test; h) sleeve test; s.5 Air tightness test The airtightness of the muffler should be adjusted according to the provisions of 4.6. 6 Inspection rules 6.1 Delivery inspection Each muffler must be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The inspection items include appearance and installation dimensions. 6.2 Type inspection The inspection items of type muffler include appearance, installation dimensions, gas hazard test, dynamic test and durability test. Sampling inspection shall be reported to GR/T282% of the provisions, and the sampling rate shall be determined by negotiation between the supply and demand parties. During the inspection, if the number of unqualified items in each item is equal to or less than the specified qualification judgment number (A:), then the batch of products shall be accepted, otherwise it shall be rejected. For packaging and storage, 1 Each muffler shall be marked with the factory name or product model. 3 JB/T9869—1999 7.2 Each muffler shall be packed in a box. The box must be waterproof and filled with other materials. It should be accompanied by product instructions, product certificates and packing list. External markings on packaging: a) manufacturer and product name; b) product name and model: c) quantity and total weight: d) receiving unit and place of shipment; d) "handle with care", "safety protection", "safety protection" and other signs: 9.4 The sterilizer should be stored in a well-ventilated warehouse without corrosive substances. Under normal storage conditions, the sterilizer will not break within 12 months from the date of leaving the factory.
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