JB/T 5243-1991 Method for determination of cleanliness of transmission box of harvesting machinery JB/T5243-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5243-1991
Method for determination of cleanliness of transmission case of harvesting machinery
Published on July 1, 1991
Implementation on July 1, 1992bzxZ.net
Method for determination of cleanliness of transmission case of harvesting machinery
1 Subject content and scope of application
JB/T5243-1991
This standard specifies the method for determination of cleanliness of transmission case of harvesting machinery (gearbox, final transmission case and other transmission gearbox) and the calculation of mass method.
This standard applies to harvesting machinery.
2 Basic requirements
2.1 The accuracy of various equipment, instruments and measuring tools used for testing should meet the requirements of measurement accuracy. Before testing, the testing equipment and instruments should be checked and calibrated.
2.2 During the test, the accuracy and reliability of each test data must be guaranteed. If abnormal data is found, the cause should be found out in time and necessary treatment should be taken.
3 Instruments and equipment
a. Filter screen, 80μm (200 mesh) standard screen b. Analytical balance, sensitivity is one ten-thousandth;
c. Oven, dryer;
d. Microscope, magnification 40 times;
e. Container (such as basin, blood vessel and bucket with lid, etc.); f. Weighing bottle;
g. Medium-speed filter paper;
h. Bottle washing and syringe, etc.;
i. Nylon round brushes and flat brushes of different specifications:
j. Tweezers:
k. Cleaning fluid, No. 120 solvent gasoline, benzene, acetone; 1. Magnet.
Operational procedures for impurity collection
Test preparation
Impurities should be collected in a clean, well-ventilated room with safety measures. 4.1.2 The operator should wear clean clothes and wash hands. Before the impurity collection operation, the non-measurement parts should be cleaned. 4.1.3
All sampling tools, containers, etc. should be cleaned. Approved by the Ministry of Machinery and Electronics Industry on July 1, 1991 and implemented on July 1, 1992
4.2 Operating procedures
JB/T5243-1991
4.2.1 Collect all the lubricating oil of each transmission box separately, 4.2.2 Clean the inner surface and parts of each box, including the surface of the magnetic screw plug, and collect the cleaning liquid with impurities separately. 5 Filtration and weighing of impurities
5.1 Filtration
Filter all the collected lubricating oil and cleaning liquid with a standard sieve of 200 mesh, or filter all the collected lubricating oil and cleaning liquid of each transmission box separately as needed.
5.2 Filter paper weighing
Put the filter paper in a clean weighing bottle, open the bottle cap and dry it in an oven at 105±5℃ for 30 minutes, close the bottle cap and take it out, put it in a dryer to cool for 60 minutes, weigh it to constant weight (the difference between two consecutive weighings is not more than 0.4mg), and then put it in a dryer for use. 5.3 Weighing impurities
5.3.1 Put the standard sieve with impurities after filtration into a container containing No. 120 solvent gasoline, benzene or acetone in turn, soak it for 20 minutes each, then take it out, then use No. 120 solvent gasoline, benzene or acetone to wash all the impurities that have been washed away from the oil into a plate, and then use the filter paper that has been weighed to filter and collect the impurities.
5.3.2 Put the filter paper with impurities in a weighing bottle, then put it in an oven at 105±5℃, open the bottle cap and dry it for 2 hours until constant weight. 6 Calculation, analysis and record of impurities and cleanliness 6.1 Weight of impurities
The weight of impurities is calculated according to formula (1):
G= G2-G
Where: G—total weight of impurities or weight of impurities in each transmission box, mg; G,—total weight of filter paper and weighing bottle before filtration or weight of filter paper and weighing bottle used in each transmission box before filtration, mg; G2—total weight of filter paper and weighing bottle with impurities after filtration, mg. 6.2 Analysis of impurities
6.2.1 Use a magnet wrapped in cellophane to separate iron filings from impurities and weigh the weight of iron filings. 6.2.2 Use a microscope to measure the size of the largest impurity particle (length × width). 6.3 Cleanliness
Cleanliness is calculated according to formula (2):
Where: c—cleanliness, mg/kW:
N—sum of rated power of each transmission box or rated power of each transmission box, kW. 6.4 Cleanliness measurement record
The cleanliness measurement record of the harvesting machinery transmission box is shown in the table below. 1)
（2）
Machine model and name:
Sampling location:
Filter screen:
Lubricating oil brand:
Transmitted power (kW):
Total weight of impurities
Including iron impurities
Cleanliness
JB/T5243-1991
Harvesting machinery transmission box cleanliness measurement record sheetManufacturer:
Machine factory number:
Test number:
Sampling date:
Measurement date:
Percentage of total impurities
Maximum impurity size (length × width)
Abnormal objects in impurities
Note: When the cleanliness of each transmission box needs to be calculated separately, the items listed in this table can be refined accordingly. Additional Notes:
This standard is proposed and managed by the Chinese Academy of Agricultural Mechanization Sciences. This standard was drafted by the Chinese Academy of Agricultural Mechanization Sciences. The main drafters of this standard are Ma Hengqi and Hong Liangchen. Measurement value
Sampling personnel:
Measurement personnel:
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