Some standard content:
ICS-65.060.99
Machinery Industry Standard of the People's Republic of China
JB/T5681-2000
Small Roller Mill
Test Method
Testmethod forsmall-sized rollermill2000-11-28 Issued
National Bureau of Machinery Industry
2001-06-01 Implementation
JB/T5681-20B0
This standard is a revision of JB/T5681-1991 "Small Roller Mill Test Method". The main revisions of this standard to JB/T5681-1991 are as follows: In addition to some provisions;
- Clarified the evaluation and calculation method of reliability indicators;- Modified some test conditions and requirements;- Simplified and improved some test record forms. This standard replaces JB/T56811991 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 Technical Committee for Agricultural Machinery Standardization. The responsible drafting unit of this standard: Shandong Agricultural Machinery Science Research Institute. The participating drafting units of this standard: Henan Nanyang Guanghui Machinery Factory, Shandong Hushan Grain and Oil Machinery Co., Ltd. The main drafters of this standard: Zhou Qingnong, Ma Nailan, Sun Zhongpei, Li Shanwen, Niu Baozhen. This standard was first issued in 1984 as NJ342-84, and was revised for the first time in 1991 as JB/T5681-91. This is the second revision.
1 Scope
Machinery Industry Standard of the People's Republic of China
Small Roller Mill
Test Method
Testmethodforsmall-sizedrollermillJB/T5681-2000
Replaces 3B/T5681-1991
This standard specifies the test conditions, test items and test methods for the performance test and production test of small roller mill. This standard applies to the performance test and production test of small roller mill, i.e. small roller mill and sieve combination machine (including single-machine automatic feeding mill, hereinafter referred to as mill). 2 Referenced 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 version of the following standards. GB1351—1999
GB/T5492-1985
GB/T5497—1985
GB/T 5504—1985
GB/T5505—1985
GB/T5506—1985
GB/T5507—1985
GB/T5509—1985
JB/T5680——2000
JB/T8838.2-—2000
JB/T50149—2000
3 Performance test
3.1 Test purpose
Grain and oilseed inspection color, odor, Taste identification method Grain and oil inspection Moisture determination method
Grain and oil inspection Wheat flour processing precision inspection method Grain and oil inspection Ash determination method
Grain and oil inspection
Gluten determination method
Grain and oil inspection Flour coarseness determination method Grain and oil inspection Flour magnetic metal content determination method Technical conditions for small roller mills
Test methods for small flour processing complete equipment Reliability assessment method for small roller mills Test the technical performance of the mill to assess whether it meets the design or improvement requirements. 3.2 Test conditions and requirements
3.2.1 The test site and prototype installation should be able to meet the requirements for the determination of various indicators of the performance test. 3.2.2 The operation of the prototype, the determination of performance indicators and the inspection of wheat flour samples should be equipped with designated skilled personnel. 3.2.3 The instruments and meters used [see Appendix A (Appendix to the standard) should be calibrated and verified before use, and the certificate of conformity should be obtained and within the validity period.
3.2.4 The test voltage is 380V, and the deviation should be within the range of ±5%. 3.2.5 The average load of the motor during the test should be within the range of 90%~110% of the rated power. 3.2.6 Before the test, investigate the basic situation of the prototype and fill in the basic parameters of the prototype in Table 1. Approved by the State Machinery Industry on November 28, 2000 and implemented on June 1, 2001
JB/T5681-2000
3.2.7 Before the test, the quality of the wheat used for the test should be inspected, and the results should be filled in Table 2. 3.2.8 The wheat used for the test should be the same variety of wheat of the third grade or above that meets the requirements of GB1351. Before the test, the wheat should be cleaned and properly regulated for moisture. 3.2.9 The amount of wheat processed for each test is calculated by adding 70% of the amount of wheat for each qualified prototype. Prepare the wheat for the test for each prototype according to three tests.
3.2.10 The test means should include test equipment or corresponding measures that synchronize the start of the prototype machine entering the test condition and the power consumption and time measurement, and synchronize the stop of the flour processing after the predetermined amount is produced.
3.3 Test measurement items and methods
3.3.1 No-load test
3.3.1.1 The prototype machine idles for 15 minutes and observes whether the operation is normal. 3.3.1.2 After the idle operation is completed, measure the milling machine's fast roller speed, powder screen rotor speed, voltage, current and no-load power. The no-load power is measured twice, each time for 3 minutes. Fill in the results in Table 3. 3.3.2 Load test
3.3.2.1 The load test is carried out once, and each time it should be carried out under full load conditions. The first test data is only for the reference of the prototype operator, and the second and third test data are the prototype performance data. Among them, the maximum bearing temperature rise and the maximum temperature of the milled material are taken as the maximum value, and the power consumption per ton of flour, the milling mill centimeter per hour and the noise are taken as the average value.
3.3.2.2 Calculate the theoretical flour extraction rate based on the quality of the wheat used for the test. The actual flour extraction rate during the load test should be consistent with the theoretical flour extraction rate, and the actual flour extraction rate should not be 1% lower than the theoretical flour extraction rate. The theoretical flour extraction rate of clean wheat shall be calculated with reference to Appendix B (suggested Appendix). 3.3.2.3 Determination of noise. Measure once in the early, middle and late stages of each test (per the provisions of 3.3.5 in JB/T8838.2-2000). Fill in the measurement results in Table 4. 3.3.2.4 Measurement of the temperature of the milled material. Use an automatic measuring device or a handheld measuring device to measure the temperature of the ground material under the two grinding rollers in the grinding chamber. Measure at least once for each T increase, and take the highest temperature as the highest temperature of the milled material. Fill in the measurement results in Table 5. 3.3.2.5 Determination of bearing temperature rise. At the end of each test, immediately use a semiconductor point thermometer to measure the surface temperature of the middle of the outer shell of the mill bearing seat, and take The maximum bearing temperature is used to calculate the maximum bearing temperature rise. Fill in the measurement results in Table 5. The maximum bearing temperature rise (°C) = the maximum bearing temperature (°C) - the room temperature during the test (°C).., ·(1)
3.3.2.6 Sampling and inspection of finished powder. After each test, mix the added T. flour evenly and sample 1.5kg at multiple points. Mix the samples taken from the two tests and divide them into two samples. One sample is used to test the flour quality, and the other is sealed as a parallel sample for future reference.
3.3.2.7 Inspection of the powder quality of finished powder. The inspection items must comply with JB/T568 02000, and perform the test according to the test methods specified in GB/T5492, GB/T5504~5507 and GB/T5509. Fill in the results in Table 6. 3.3.3 After the load test, perform another 3-minute no-load test on the unit, and compare the measured no-load power with the value before the load test. It is normal if the no-load power after the load test is between 95% and 105% of the no-load power before the load test. 3.3.4 Fill in the measured data and test results of the load test in Table 5. 3.4 Calculation of several indicators
3.4.1 Pure T as hourly generator Production capacity, calculated according to formula (2): JB/T5681-2000
Where: E
Pure working hour production capacity, kg powder/h; Q—the amount of finished powder added, kg;
T grinding mill.T. working time, h.
3.4.2 The output of milling mill centimeters per hour is calculated according to formula (3): E. or E
-milling roller centimeters per hour, kg powder/(cm·h) Where: E-
L, grinding roller contact length, cm.
3.4.3 The power consumption per ton of powder is calculated according to formula (4): o
G,-1000Gm
Where: G is the power consumption per ton of powder, i.e. the power consumed by the mill for grinding one ton of powder, kW·h/t: G is the power consumed during the mill test, kW·h. 3.4.4 The load degree is calculated according to formula (5): K
Where: K is the load degree of the motor;
P is the rated power of the motor, kW;
n is the efficiency of the motor, %.
n×100%
3.5 After the performance test is completed, the test data should be verified, the test results should be calculated and analyzed, conclusions should be drawn, and a performance test report should be written. 4 Production test
4.1 Test purpose
To assess the economy, reliability, performance stability, suitability of materials of different qualities, durability of main components and wearing parts, convenience and safety of use and maintenance of the prototype under actual use conditions. 4.2 Test conditions and requirements
4.2.1 Test conditions shall comply with the provisions of 3.2.1, 3.2.2 and 3.2.3. 4.2.2 Test wheat shall be properly treated with moisture adjustment. 4.2.3 There shall be no less than two test prototypes, and the test shall be conducted at different points. The technical status of the prototype shall comply with the provisions of relevant documents. 4.2.4 The test time for each machine shall be 150 pure working hours, and the total average milling mill-hour output shall not be less than 5.0kg powder/(cm·h). When the main parts need to be replaced, the test time shall be recalculated. 4.2.5 The test must be assigned to a specific person, and the test and operation personnel shall be equipped according to the standard requirements and the provisions of the instruction manual. The work records of each shift must be filled in Table 7, Table 8 and Table 9 as required. 4.2.6 The determination of the basic parameters of the prototype, the no-load test and various records during the test shall be carried out in accordance with the relevant provisions of the performance test of this standard.
4.2.7 During the test, the prototype shall be subjected to at least three performance tests at the beginning, middle and end. The specified items and methods shall be carried out in accordance with the relevant provisions of the load test in 3.3.2. The wheat used for the test shall comply with the provisions of 3.2.9. JB/T5681--2000
4.2.8 During the test, it shall be checked that there shall be no less than three shifts, and the continuous working time of each shift shall not be less than 6 hours. The working time, number and time of failures, power consumption, and amount of processed flour of each shift shall be recorded. The results shall be filled in Table 10. 4.2.9 During the test, the working condition of the prototype shall be observed or measured, and the degree of running stability, flour leakage, bran leakage, oil leakage, etc. shall be recorded. The results shall be filled in Table 9.
4.2.10 For the main wearing parts, measurements shall be made at the same position before and after the test. When replacing parts during the test, wear measurement shall be made, the service time and amount of processed flour of the replaced parts shall be counted, and the deformed or damaged parts shall be analyzed. Fill in the measured data and cause analysis in Table 11.
4.3 Test measurement items and calculation methods
4.3.1 The average shift milling mill centimeters per hour is calculated according to formula (6): Eb
Where: Em—shift milling mill centimeters per hour, kg flour/(cm·h); O. shift flour output, kg;
L, roller contact length, cm;
T-shift T. working time, h.
4.3.2 The power consumption per ton of flour is calculated according to formula (7): SG
Where: G. Power consumption per ton of flour, kW·h/t:
G. Total power consumption for adding flour during the test, kW·h. 4.3.3 Product reliability index
Product reliability index, mean time before first failure MTTFF, mean time between failures MTBF and reliability R shall be evaluated and calculated according to the method specified in JB/T50149.
4.3.4 The ability of producing flour per centimeter of grinding roller in one drawing Under the condition that the average output of grinding roller is not less than 5.0kg flour/(cm·h) per centimeter, the amount of flour added per centimeter of grinding roller is calculated, which is the ability of producing flour per centimeter of grinding roller in one drawing. 4.4 Test result processing
After the production test is completed, the test data should be verified, the test results should be calculated, the test situation should be analyzed, conclusions should be drawn, and a production test report should be written. 5 Test summary report
After the test is completed, the "performance test report" and "production test report" should be sorted out and summarized, comprehensively analyzed, and a test summary report should be submitted. The test summary report should include the following contents: a) Test purpose, requirements, time, location, participating units, participating personnel and test conditions, etc.: b) Model, specification, number, factory date and structural characteristics of the prototype: c) Test condition analysis:
d) Test result analysis:
e) User opinions and suggestions during the production test; f) Conclusion:
g) Attachments.
Product model and name:
Prototype number:
Equipped motor (model, power)
Overall dimensions of the whole machine (length × width × height) mm Whole machine weight kg
Investigator:
Grinding roller length
Grinding roller diameter
Fast speed r/min
Fast and slow roller speed ratio
Grinding mill bearing||t t||Speed thmin
Screening specification
Screening area m
Inspected factory
Inspection model
Inspection purpose
Sampling date
Inspection environment
Inspection date
Inspector:
JB/T5681-2000
Table 1 Basic parameters of prototype
Manufacturing order Position:
Date of manufacture:
Verification:
Table 2 Wheat inspection record
Inspection items
Volume%
Dry grain mass g
Ash%
·Imperfect grain
Minerals
Moisture%
Color, odor
Theoretical flour yield%
Verification:
Inspection Test results
Product model and name:
Matching motor (model and power)
Test location:
Voltage V
Current A
Fast roll speed
Screen speed
Feed roll speedbZxz.net
Test time
Electric meter reading
kw+h or r
Power consumption
Unit no-load power
Measurer:
Product model and name:
Prototype number:
Test location:
Background noise
Working noise
E (maximum)
Sketch of measuring point location
Measurement:
JB/T5681-2000
Table 3 No-load test record||tt ||Manufacturing unit:
Prototype number:
Test date:
Before load test
Calibration:
Table 4 Noise measurement disk record sheet
Manufacturing unit:
Matching motor:
Test date:
Calibration:
Dense powder machine
After load test
Average of the 2nd and 3rd times||t t||Product model and name:
Prototype number:
Test location:
Test wheat grade:
Clean wheat moisture%
Clean wheat weight kg
Theoretical flour extraction%
Finished flour weight kg
Bran weight kg
Actual flour extraction%
Load test voltage V
Test time Time
Electricity meter reading
kw·h or r
Power consumption kw·h
Average input power kw
Load degree%
Power consumption per ton of flour kW·h/t
Production capacity
Bearing temperature
Detection:
Mice produced per hour kg flour/h
Eggs produced per hour
kg flour/ (cm·h)
Overflow in the test room
Maximum temperature of the grinding material
Maximum temperature rise of the bearing
JB/T5681-2000
Table 5 Load test record
Manufacturer:
Matching motor model and power:
Test time:
Weather:
Verification:
Test results
Inspected factory
Inspection model
Month of inspection
Sampling date
Inspection environment
Inspection date
Inspector:
Product type No. and name:
Prototype No.:
Test location:
Working hours
Measurer:
JB/T5681-2000
Table 6 Flour inspection record
Inspection item Month
Add 1 accuracy
Ash content (based on dry matter)
Coarseness
Gluten quality (based on wet content)
Magnetic metal objects
Odor, door smell
Verification:
Table 7 Production test record
Manufacturing unit:
Factory date:
Test date:||tt ||Electricity meter
Prototype operation:
kw·h/t
Test results
Production capacity
Wheat quality
kg powder/
kg powder/h
(cm·h）
Product model and name:
Prototype number:
Test location:
Fault troubleshooter:
Product model and name:
Prototype number:
Test location:
Inspection items
Operation condition
Sealing condition
JB/T5681-20 00
Production test fault record
Manufacturing unit:
Factory date:
Test date:
Fault time
Vibration condition
Abnormal sound
Structural assessment
Inspector:
Statistical record:
Fault location
Table 9 Prototype operation inspection table
Manufacturing unit:
Factory date:
Test date:
Inspection results
Verification:
Troubleshooting measures
Fault source
Cause analysis
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