Some standard content:
ICS65.060.99
Machinery Industry Standard of the People's Republic of China
JB/T8838.2—2000
Small-sized complete set equipment for processing wheat flour
Test method
Test method for small-sized complete set equipmentfor processing wheat flour
Issued on July 19, 2000
State Bureau of Machinery Industry
Implementation on August 1, 2000
JB/T8838.2-2000
This standard is a revision of JB/T8838.2-1999 "Test method for small-sized complete set equipment for processing wheat flour". Compared with JB/T8838.2-1999, the main technical content of this standard has been changed as follows: 1. The scope of application of the original standard has been expanded to include the test methods for small-scale grade flour processing equipment; 1. The dust concentration measurement and calculation methods applicable to old dust samplers have been deleted; 1. The productivity index of the daily wheat processing volume of the complete set of equipment has been added; 1. The reliability index assessment method has been specifically stipulated. This standard replaces JB/T8838.2--1999 from the date of implementation. Appendix A of this standard is the appendix of the standard.
Appendix B of this standard is the appendix of the reminder.
This standard is proposed and managed by the National Agricultural Machinery Standardization Technical Committee. The responsible drafting unit of this standard: Shandong Agricultural Machinery Science Research Institute. The participating drafting units of this standard: Shandong Hushan Grain and Oil Machinery Co., Ltd., Henan Nanyang Guanghui Machinery Factory. The main drafters of this standard: Zhou Qingnong, Sun Zhongpei, Ma Nailan, Sun Yulong, Zhang Yucai. This standard was first issued in 1987 as ZBX91002.2-87, and the standard number was adjusted to JB/T8838.2-1999 in 1999. 1 Scope
Machinery Industry Standard of the People's Republic of China
Small-sized complete set equipment for processing wheat flour
Test method
Test method for small-sized complete set equipment for processing wheat flour
This standard specifies the conditions and methods for performance test and production test of small-sized complete set equipment for processing wheat flour. This standard applies to small-sized complete set equipment for processing wheat flour (hereinafter referred to as complete set equipment) 2 Referenced standards
JB/T8838.2-2000
Replaces JB/T8838.2-1999
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 version of the following standards. GB/T 5492--1985 5
GB/T5506—1985
GB/T 5507—1985
GB/T5508—1985
GB/T5509—1985
JB/T8838.1—2000
JB/T50195-2000
3 Performance test
3.1 Test purpose
Simplified method of measuring surface by envelope above reflecting surface Acoustic sound pressure method for measuring sound power level of noise source Electrical and acoustic performance and test method of sound level meter Color, odor and taste identification method
Grain and oil inspection
Grain and oil inspection Moisture determination method
Grain and oil Material inspection Wheat flour processing precision inspection method Grain and oil inspection
Ash determination method
Grain and oil inspection
Gluten determination method
Flour coarseness determination method
Grain and oil inspection
Grain and oil inspection
Flour sand content determination method
Grain and oil inspection
Flour magnetic metal content determination method
Technical conditions for small flour processing complete equipment Product reliability assessment method for small flour processing complete equipment Determine the working performance and related technical and economic indicators of the complete equipment to assess whether it meets the design or improvement requirements. 3.2 Test conditions and requirements
3.2.1 The test site and the installation of the complete equipment should be able to meet the requirements for the determination of various indicators of the performance test. 3.2.2 The operation and determination of the complete equipment, the sampling and inspection of wheat and flour should be equipped with fixed skilled personnel. 3.2.3 The power of the complete set of equipment is an electric motor, and its power matching should meet the design requirements. Approved by the State Bureau of Machinery Industry on July 19, 2000 and implemented on August 1, 2000
JB/T8838.2-2000
3.2.4 The test instruments and meters [see Appendix A (Appendix to the standard)] must be calibrated and qualified before use. And within the validity period. 3.2.5 Before the test, the complete set of equipment shall be fully inspected and adjusted according to the design and use requirements to ensure normal and stable operation. The basic parameters of the complete set of equipment shall be recorded in Table 1.
3.2.6 The test voltage is 380V, and the deviation should be within the range of ±5%. 3.2.7 The average load of each motor in the test should be within the range of 90%~110% of the rated power. 3.2.8 The wheat used for the test should meet the requirements of GB1351 for wheat of grade 3 or above (including grade 3). The wheat shall be cleaned between wheat and reasonably regulated for moisture before entering the mill.
3.2.9 Before the test, the quality of the wheat to be tested should be sampled and inspected in advance, and the results should be recorded in Table 2. 3.3 Test items and methods
3.3.1 Wheat inter-load test
3.3.1.1 The measured output should be controlled within the range of 100%~130% of the rated output of the complete set of equipment. 3.3.1.2 Before the formal test, the dry wheat after cleaning and before watering should be sampled three times, each sampling time is 3min, and the sampling mass is G, G2, G, (kg). The sample error should not exceed 3%, and the sampling average value is taken as the measured output. 3.3.1.3 If the measured output meets the requirements, the load test can be carried out while maintaining the original working conditions. The test is carried out twice, and each measurement records the reading of the electric meter, test time, voltage, noise and dust data. Dry wheat sampling is required for 3 minutes between the two tests and after the second test. The sampling masses are Gs and G, (kg) (the deviation between G4, G, and G, should not exceed 3%). 3.3.1.4 Calculation of wheat cleaning productivity: Em = (G, + G,) × 10
Where: Em—wheat cleaning productivity during the first load test, kg/h. Em = (G, + G,) × 10
Where: Em2—wheat cleaning productivity during the second load test, kg/h. 3.3.1.5 The test of inter-wheat load is based on the average of two tests, and the calculation results are filled in Table 3. 3.3.2 Determination of the cleaning effect of inter-wheat
(2)
3.3.2.1 During each test, the wheat before entering the first cleaning equipment and the milled wheat are sampled three times respectively. Two samples are taken from the same sampling point each time, and the mass of each sample is not less than 1kg. One is used as the original sample and the other is used as the parallel sample. The three original samples from the same sample point are evenly mixed to form the original sample, from which the average sample is obtained using a sample divider. The three parallel samples shall not be mixed and can only be processed after the test is completed and verified.
3.3.2.2 Take a sample of 100g from the wheat before entering the first cleaning equipment, wipe out the broken wheat, weigh and calculate the percentage and determine the ash content. Take two samples and take the average of the two samples as the test result. 3.3.2.3 Take 100g of sample from the clean wheat sample, separate the broken wheat, weigh and calculate the percentage and determine the ash content. Take two samples and take the average of the two samples as the test result. 3.3.2.4 Calculation of wheat broken rate
Broken rate (%) = Broken wheat content of clean wheat before milling (%) - Broken wheat content of wheat entering the mill (%) ·\: 3.3.2.5 Calculation of wheat ash reduction
Wheat ash reduction (%) = Ash content of wheat before entering the mill (%) Ash content of clean wheat before milling (%)., (4) 3.3.2.6 Fill in the results of wheat room cleaning effect test in Table 4. 3.3.3 Milling room load test
JB/T8838.2-2000
3.3.3.1 The measured output should be consistent with the rated output of the complete set of equipment, and its deviation should be within the range of ±10%. When processing standard flour, the actual flour extraction rate should not be lower than 99.% of the theoretical flour extraction rate of standard flour net wheat: When adding 1 other grades of flour, the flour extraction rate should comply with the provisions on flour extraction rate in JB/T8838.1.
3.3.3.2 Before the formal test, under the condition that the flour room unit operates normally, samples are taken three times synchronously at the flour outlet and bran outlet, each time for 2 minutes, and weighed separately. Test the output and flour extraction rate. 3.3.3.3 If the test output and flour extraction rate meet the requirements, the flour needs to be compared with the standard sample. If the flour accuracy is qualified, the load test can be carried out while maintaining the original working conditions. The test is conducted twice, each time for 30 minutes, and the reading of the electric meter and the test time, voltage, current, temperature of the material under the mill (detected by receiving the material under the roller of each mill), bearing temperature of the mill, noise, dust and other data are recorded. After the first test, the measured output and powder extraction rate are calculated. If it is still within the control range, continue the second test, otherwise, continue the test after re-adjustment. The test results are recorded in Table 5.3.3.3.4 The average value of the two tests is used as the assessment basis for the load test in the powder room. 3.3.4 Random inspection test of the load degree of the powder room
During the above load test process, if it is necessary to verify the rationality of the supporting power of a single machine, the two-wattmeter method can be used to measure the input instantaneous power of the single machine during the entire load test process, take the average value, and calculate the load degree. 3.3.5 Determination of noise
3.3.5.1 Measurement conditions and methods
The test instrument shall comply with the sound level meter of type 2 or above specified in GB/T3785, and the A-weighted network of the sound level meter shall be used. No obstacles shall be placed around the complete set of equipment, and the distance between the complete set of equipment and the wall at the noise measurement point shall generally be greater than 2m. The test instrument shall be placed in a horizontal position, with the microphone facing the noise source, the height of the microphone from the ground is 1.5m, and the distance from the complete set of equipment is 1m (measured according to the reference body surface), the slow gear shall be used, and the measurement time shall be 2~5s. The accidental change of noise shall not be considered. The number of measurement points each time shall be five points, such as the four points A, B, C, and D in the figure plus the maximum noise point measured along the rectangular path of the measurement surface. At the same time, the background noise of the corresponding point shall be measured. The location of the noise measurement point is shown in Figure 1 Grass Slippery Body Grid
Precision Body Surface
Note: h=1.5m, d=)m.
Figure 1 Location of noise measurement points
3.3.5.2 Data processing
JB/T8838.2-2000
According to GB/T3768, measure and calculate the surface average sound pressure level LpA according to formula (5): L10ig
10°(Lp-K,))
Where: LpA—average A sound level of the measured surface, dB (A); K—noise correction value of the i-th point;
LpAi——A sound level measured at the i-th point;
N Total number of measurement points.
Note: When the value range of Lp-K, does not exceed 5.0dB, the arithmetic mean can be used instead of the energy mean. (5)
When measuring the A sound level at each measuring point, if the difference with the A sound level of the background noise is less than 3dB (A), the measurement result is invalid; if the difference is greater than 10dB (A), the influence of the background noise can be ignored; when the difference is less than 10dB (A) but greater than 3dB (A), the measured A sound level should be corrected according to the correction value specified below. The noise measurement results are recorded in Table 6. The difference between the two noise levels dB (A)
3.3.6 Determination of dust concentration
Db (A) should be subtracted from the measurement
When measuring the wheat room, place the dust sampler near the cleaning screen or wheat thresher in the wheat room. When measuring the flour room, place the sampler near the flour receiving port of the flour room, about 1.5m away from the equipment, with the center of the sampling head 1.4~1.5m above the ground, and measure two points to take the average value. Finally, the highest dust concentration in the wheat room and the flour room is taken as the dust concentration value of the complete set of equipment. 3.3.7 Sampling and inspection of finished powder
At the end of the load test in the flour room, take a certain amount of flour from each bag of flour obtained from the two tests as a powder sample, and take out a total of 3kg of powder sample. Spread it flat on a square glass plate, divide it diagonally, take 1.5kg of powder as the original sample to test the powder quality, and put another 1.5kg into a ground-mouth bottle for future reference. After the test is completed, it can be processed only after verification. The inspection of the finished powder quality should be carried out according to the inspection methods specified in GB/T5492, GB/T5497 and GB/T5504~5509. The inspection results are recorded in Table 7.3.4 Calculation of technical and economic indicators
3.4.1 Pure working hour productivity (measured in flour output) E
Where: E. ——Pure working hourly productivity, that is, the mass of flour ground by the milling unit per unit time, kg/h; Or———actually measured flour mass during the test, kg; T—time used for grinding materials during the test, h. 3.4.2 Grinding roller centimeter-hour output
Where: E——Hourly productivity per centimeter of grinding roller contact length, kg flour/(cm·h); -Total grinding roller contact length, cm.
3.4.3 Flour extraction rate (calculated as flour-bran ratio)
Where: g
—actual flour extraction rate;
JB/T8838.2-2000
Q2——actually measured bran mass during the test, kg. x1000%
Note: The calculation of the theoretical flour extraction rate of standard flour and clean wheat for performance test shall refer to Appendix B (Suggested Appendix). 3.4.4 Productivity
Where: P
P=2n+Q2
1000T.
-Productivity of complete equipment, i.e. the amount of wheat processed in 24 hours, t/24h. 3.4.5 Power consumption per ton of flour
3.4.5.1 Power consumption in wheat room
=×1000
Where: G.-Power consumption per ton of flour in wheat room: i.e. the power consumed for cleaning wheat equivalent to 1 ton of flour, kW·h/t; Actual power consumption in wheat room, i.e. the power consumed from the start to the stop of wheat room measurement. kW·h: Gmz
-Actual wheat mass, kg.
3.4.5.2 Power consumption in the mill
Where: G
Grzx1000
-Power consumption per ton of flour in the mill, i.e., the power consumed to grind 1 ton of flour, kW·h/t; - Actual power consumption in the mill during the test, kW·h3.4.5.3 Power consumption per ton of flour in a complete set of equipment
Where: G
A complete set of equipment plus.T.The power consumed per ton of flour, kW·h/t. 3.4.6 Calculation of single machine load power and matching motor load level P,=Pn
Where: Pz——Average output power of the motor kW; -Average input power of the motor, kW;
-Efficiency of the motor, %.
Where: K—Motor load level;
P—Rated power of the motor, kW.
4 Production test
(10)
(12)
(13)
4.1 Test purpose
To assess the economy, reliability, performance stability, safety, service life of main components and wearing parts, and convenience of maintenance of the complete set of equipment under actual use conditions. 4.2 Test conditions and requirements
4.2.1 The test conditions shall comply with the provisions of 3.2.1, 3.2.2 and 3.2.3. 5
JB/T8838.2-2000
4.2.2 There shall be two complete sets of equipment for the test, which shall be tested at two test points, and their technical conditions shall comply with the provisions of the product manual. 4.2.3 The production test time for each set shall not be less than 300 hours of pure working time. 4.2.4 The test wheat shall comply with the provisions of 3.2.8. 4.2.5 The test must be assigned to a specific person, and the test personnel and operators must be equipped according to the requirements of the standard and the provisions of the instruction manual. The work of each shift must be recorded in Table 8. 4.2.6 The determination of the basic parameters of the complete set of equipment and the relevant records during the test process shall be carried out in accordance with the items and methods specified in the performance test part of this standard.
4.2.7 During the production test, the complete set of equipment shall be subjected to at least three major performance sampling tests in the early, middle and late stages. The sampling items and methods are the same as those of the performance test of this standard.
4.2.8 The main wearing parts shall be measured at the same position before and after the test (measure the maximum wear amount), and the use time and processing material volume of the parts shall be recorded in Table 9. When parts need to be replaced during the test, wear measurement (including wearing parts) shall be made, and the use time and processing material volume of the replaced parts shall be counted. 4.2.9 During the production test, the production inspection shall not be less than three shifts, and the continuous working time of each shift shall not be less than 6h. Record the working hours, number and time of adjustment failures, power consumption, processing volume, etc. for each shift and record the results in Table 8. 4.2.10 Observe or measure the working condition of the complete set of equipment, record the degree of running stability and the four leakages (leaking flour, bran, oil and air), and record the results in Table 10.
4.2.11 After the production test is completed, the measured data shall be summarized and recorded in Table 11. 4.3 Test measurement items and calculation methods
4.3.1 Shift hourly productivity
Where: E,——Average shift hourly productivity during the production test, kg/h; Q——Quality of finished flour processed by the shift during the production test, kg; T,-—Shift time during the production test, h. 4.3.2 Shift power consumption per ton of flour
Where: GAverage shift power consumption per ton of flour during the production test, kW·h/t; Gmb—Power consumption of wheat shift during the production test, kW·h; GbPower consumption of flour shift during the production test, kW·h; QFlb—Production of finished flour per shift during the production test. to4.3.3 Reliability index
（15）
The reliability index of complete equipment shall be assessed by the mean time before first failure MTTFF, mean time between failures MTBF and reliability R. The specific assessment method shall be in accordance with the provisions of JB/T50195. 5 Test summary report
After the test, the performance test report and production test report shall be collated and summarized, and a test summary report shall be put forward after comprehensive analysis. The test summary report shall include the following contents:
a) Test purpose, requirements, time, location, participating units and personnel, and test conditions, etc.:6
JB/T8838.2-7000
b) Model, specification and structural characteristics of complete equipment; c) Test condition analysis;
d) Test results and analysis;
e) User opinions and suggestions during production test; f) Conclusion;
g) Attachments.
Table 1 Basic parameters of small flour milling equipment Product model and name:
Test location:
Prototype number
Main equipment name
Measurer:
Origin:
Inspection date:
Measurer:
Rated output t/24h
Manufacturing unit:
Measurement date:
Overall dimensions
(length×width×height)
Verification:
Table 2 Wheat inspection record
Variety:
Inspection unit ：
Inspection items
Thousand-grain weight
Crushing rate
Minerals
Color, smell
Theoretical flour yield
Crushing rate
Equipped power kw
Inspection results
Verification:
Product model and name:
Test location:
JB/T8838.2-2000
Table 3 Wheat room load test record and performance data table Manufacturing unit:
Test period:
Test items
Test voltage||tt ||Test time
Actual processing capacity (wheat)
kg/3min
Electric meter reading
Power consumption
Theoretical flour yield
Cleaning productivity
Cleaning productivity per ton of flour
Power consumption per ton of flour
Noise dB (A)
Measurer:
Product model and name:
Test location:
Measurer:
kw·h or r
kg (wheat)/h
kg (flour)/h
kW·h/t
Verification:
Table 4 Wheat Room Cleaning Effect Inspection Record
Manufacturer:
Test Date:
Verification:
Room Temperature (℃):
Number of Tests
Waste contains full grain
Product model and name:
Test Location:
Grinding Mill
Bearing Temperature
dB (A)
Test Voltage
Total Test Current
Test Time
Measured Flour
Measured Leather
JB/T 8838.2-2000
Table 5 Load test record and performance data of powder roomManufacturer:
Test date:
min, s
Electric meter reading
Power consumption
Theoretical powder yield
Actual powder yield
Maximum temperature of material under grinding
kW·h or r
Maximum temperature
Maximum temperature rise
Power consumption per ton of powder in powder room
Productivity
kw·h/t
(kg powder/h)/(t wheat/d)
Output of grinding roller in centimeters per hour
Measurer:
kg powder/(cm·h)
Calibration:
Room temperature (℃):
Number of tests2-2000
Table 3 Wheat room load test record and performance data sheetManufacturer:
Test period:
Test items
Test voltage
Test time
Measured processing capacity (wheat)
kg/3min
Electric meter reading
Power consumption
Theoretical flour yield
Cleaning productivity
Cleaning productivity per ton of flour
Power consumption per ton of flour
Noise dB (A)
Measurer:
Product model and name:
Test location:
Measurer:
kw·h or r||tt ||kg（wheat）/h
kg（flour）/h
kW·h/t
Verification:
Table 4 Wheat Room Cleaning Effect Inspection Record
Manufacturer:
Test Date:
Verification:
Room Temperature（℃）:
Number of Tests
Waste contains full grain
Product model and name:
Test Location:
Grinding Mill
Bearing Temperature
dB（A)
Test Voltage
Total Test Current
Test Time
Measured Flour
Measured Skin
JB/T 8838.2-2000
Table 5 Load test record and performance data of powder roomManufacturer:
Test date:
min, s
Electric meter reading
Power consumption
Theoretical powder yield
Actual powder yield
Maximum temperature of material under grinding
kW·h or r
Maximum temperature
Maximum temperature rise
Power consumption per ton of powder in powder room
Productivity
kw·h/t
(kg powder/h)/(t wheat/d)
Output of grinding roller in centimeters per hour
Measurer:
kg powder/(cm·h)
Calibration:
Room temperature (℃):
Number of tests2-2000
Table 3 Wheat room load test record and performance data sheetManufacturer:
Test period:
Test items
Test voltage
Test time
Measured processing capacity (wheat)
kg/3min
Electric meter reading
Power consumption
Theoretical flour yield
Cleaning productivity
Cleaning productivity per ton of flour
Power consumption per ton of flour
Noise dB (A)
Measurer:
Product model and name:
Test location:
Measurer:
kw·h or r||tt ||kg（wheat）/h
kg（flour）/h
kW·h/t
Verification:
Table 4 Wheat Room Cleaning Effect Inspection Record
Manufacturer:
Test Date:
Verification:
Room Temperature（℃）:
Number of Tests
Waste contains full grain
Product model and name:
Test Location:
Grinding Mill
Bearing Temperature
dB（A)
Test Voltage
Total Test Current
Test Time
Measured Flour
Measured Skin
JB/T 8838.2-2000
Table 5 Load test record and performance data of powder roomManufacturer:
Test date:
min, s
Electric meter reading
Power consumption
Theoretical powder yield
Actual powder yield
Maximum temperature of material under grinding
kW·h or rbzxZ.net
Maximum temperature
Maximum temperature rise
Power consumption per ton of powder in powder room
Productivity
kw·h/t
(kg powder/h)/(t wheat/d)
Output of grinding roller in centimeters per hour
Measurer:
kg powder/(cm·h)
Calibration:
Room temperature (℃):
Number of tests
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