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GB/T 8697-1988 Test method for primary screening of grains

Basic Information

Standard ID: GB/T 8697-1988

Standard Name: Test method for primary screening of grains

Chinese Name: 粮食初清筛试验方法

Standard category:National Standard (GB)

state:Abolished

Date of Release1988-03-11

Date of Implementation:1988-06-01

Date of Expiration:2005-10-14

standard classification number

Standard ICS number:Food Technology >> 67.260 Food Industry Plants and

Standard Classification Number:Food>>Food Processing Machinery>>X91 Grain and Oil Processing Machinery

associated standards

alternative situation:Adjusted to LS/T 3519-1988

Procurement status:ISO 2395-1972,REF;GOST 3949-1974,REF

Publication information

other information

Review date:2004-10-14

Drafting unit:Zhengzhou Grain Research Institute

Focal point unit:National Technical Committee on Grain and Oil Standardization

Publishing department:National Bureau of Standards

competent authority:State Grain Administration

Introduction to standards:

This standard specifies the purpose, conditions, test items, test methods and content and requirements of the test summary report for the performance test and production test of grain primary cleaning screens. This standard is applicable to the performance test and production test of grain primary cleaning screens. The test items in this standard may be increased or decreased according to the characteristics of different machine models and test purposes. GB/T 8697-1988 Test method for grain primary cleaning screens GB/T8697-1988 standard download decompression password: www.bzxz.net

Some standard content:

National Standard of the People's Republic of China
Testing methods for grain
pre-cleaning machine
UDC664.71/72
GB8697—88
This standard adopts the international standard ISO2395-1972 "Test sieves and screening - terminology" Chapter 3: "Test sieves". 1 Subject content and scope of application
1.1 Subject content
This standard specifies the purpose, conditions, measurement items, measurement methods and content and requirements of the test summary report of the performance test and production test of grain pre-cleaning sieves.
1.2 Scope of application
This standard is applicable to the performance test and production test of grain pre-cleaning sieves. The test and measurement items of this standard may be increased or decreased according to the characteristics of different machine models and test purposes. 2 Reference standards
GB5667-85 Test methods for agricultural machinery production GB5983-86 Test methods for seed cleaning machines
LS58-82 Test methods for primary grain cleaning screens
LS59-80 Test methods for self-balancing and eccentric vibrating screens LS60-80 Test methods for high-speed vibrating screens
3 Performance test
3.1 Test purpose
Through the performance test, the working performance, structural characteristics, and relevant technical and economic indicators of the prototype are measured and evaluated to see whether they meet the design or improvement requirements.
3.2 Test conditions and requirements
3.2.1 The test site and prototype installation should comply with the requirements of the product manual and meet the needs of various measurements in the performance test. 3.2.2 The operation, measurement, and inspection of the prototype should be equipped with fixed skilled personnel. 3.2.3 The test instruments and meters (see Appendix A) should be calibrated and qualified before use. 3.2.4 The test shall select rice or wheat of medium quality and sufficient quantity that meets the standards of GB1350 "Rice" or GB1351 "Wheat", which shall contain about 0.05% of large impurities (matters on the test sieve). When the content of large impurities is insufficient, it is allowed to mix the large impurities cleaned out from the same batch of raw grain. 3.2.5 Test sieve
3.2.5.1 The test sieve is a high sieve installed in the test process of the prototype, so that the angle between the sieve surface and the horizontal plane is 30~33°, and the material under the sieve of the prototype is processed. Its sieve hole configuration shall be the same as the sieve hole of the large impurity sieve surface of the prototype. 3.2.5.2 The width of the test sieve is calculated as follows: B = 10002
Approved by the Ministry of Commerce of the People's Republic of China on March 11, 1988 (1)bzxz.net
Implemented on June 1, 1988
Wherein, B is the width of the test sieve, cm,
Q is the processing capacity, t/h;
q is the processing capacity per unit sieve width, kg/cm·h. GB8697-88
For different series of primary cleaning sieves, the g value is different, see Table 1. Table 1 g value of different series of primary cleaning sieves
Product series
TCQS series
Shulong primary cleaning sieve
*This value is only used for manufacturing test sieves.
TCQW Series
Mesh Belt Primary Screen
3.2.5.3 The length of the test screen is (12)B; the smaller value is taken for the larger width. 3.2.6 During the primary screen test, the fan and dust collector shall be installed according to the design requirements. 3.3 Test Items and Methods
TQLZ Series
Self-balancing Vibrating Screen
250~500
TCQY Series
Circular Primary Screen
3.3.1 Before the test, conduct a comprehensive inspection according to the design requirements and adjust it to a good technical state, and measure its main specifications, dimensions and parameters, and fill in Tables 2 to 5.
3.3.2 No-load test. Run the empty vehicle for 15 minutes, observe and measure, record the following conditions, and fill in Tables 6 and 8. a.
Spindle and fan speed:
Screen surface linear speed, screen speed, amplitude, frequency; unit no-load power, fan no-load power, voltage, current; prototype operation, vibration, noise, etc. Performance test should be carried out under full load conditions of the prototype. In the test process, except for necessary operations, adjustments should be made as little as possible. 3.3.3
3.3.4 The same batch of materials of each variety shall be measured at least twice, and the test time is about 2 hours. And record the variety and origin of the materials and fill in Table 7.3.3.5 Process performance measurement items, methods and calculations3.3.5.1 Measurement and calculation of large impurity removal rate For each test, a batch of materials shall be measured three times. The first measurement shall be carried out about 20 minutes after the start of the test, and each measurement time shall be no less than 30 minutes. Collect all the large impurities leaving the machine, weigh the mass, and record it in sample tag B1; all the materials leaving the machine shall pass through the inspection sieve, collect all the large impurities on the sieve, weigh the mass, and record it in sample tag B1.
Calculation formula for the removal rate of large impurities:
n(%) =
Where.--Removal rate of large impurities, %,
Mass of large impurities leaving the machine during the measurement time, kg; m2Mass of large impurities on the inspection sieve, kg.
Take the average of the three removal rates of large impurities. 3.3.5.2Calculation formula for the content of large impurities: mi
β(%)=1000ml
Where: β is the content of large impurities, that is, the percentage of the mass of full grains in the large impurities during the measurement time, %; m3 is the mass of full grains in the large impurities during the measurement time, g. 3.3.5.3Determination and calculation of processing capacity
(2)
(3)
During the measurement time of process performance, take samples of the raw grain entering the machine twice, each time for no less than 5 minutes, collect all the samples, weigh them and record them in the sample tag B3. Calculation formula for processing capacity:
·(4)
W—the total amount of raw grain entering the machine within t seconds, kg; GB8697-88
(--the time used to process the total amount W entering the machine, min. 3.3.5.4 Calculation of processing capacity per unit screen width or per unit screening area. Calculation formula for processing capacity per unit screen width:
Calculation formula for processing capacity per unit screening area:
Where: 9 processing capacity per unit screen width, kg/cm.h; q——processing capacity per unit screening area, kg/cm·h; B-—nominal total screen width, cm;
S-nominal screening area, cm2.
3.3.5.5 Calculation formula for unit power consumption|| tt||Where: P is the unit power consumption, that is, the number of degrees of electricity used to process 1 t of material; A---power consumption, kW·h;
Working time, h.
3.3.6 Mechanical properties measurement items and methods
(5)
·(6)
While measuring the process performance each time, measure and record the following items, each twice, take the average value, and fill in Table 6 and Table 8 respectively. a.
Spindle and fan speed;
Screen surface linear speed, screen shell speed, amplitude, frequency; unit power, fan power, voltage, current; measurement and calculation of wind speed (measurement point should be indicated), wind pressure, and air volume; measurement of bearing temperature rise: at the end of the test, use a semiconductor point thermometer to measure the surface temperature of each bearing housing and record the test location Room temperature, calculate the bearing temperature rise (℃);
Measure and record the dust concentration and hygiene conditions of the air around the equipment; t.
Observe and record the operation, vibration and noise of the equipment; g.
Observe and record the number of operations, content, convenience, flexibility and reliability of the adjustment system, as well as the occurrence and cause of failures, number of times and treatment methods;
Analyze and evaluate the structural rationality and manufacturing quality. 1.
Structural rationality refers to whether the structure of the main working parts, the transmission method, the arrangement of parts, etc. are reasonably designed, whether the manufacturing, operation, assembly and disassembly are convenient and the degree of standardization.
Manufacturing quality refers to the appearance evaluation of the manufacturing (casting, cutting, punching and shearing, welding) and assembly quality of the main parts. Or simple measurement and inspection, the flexibility of the main transmission parts and the reasonable degree of tightness and tightness, etc. 3.3.7 The main indicators for measuring the performance of the primary cleaning screen are arranged in order of priority: large impurity removal rate, large impurity grain content, unit screen width processing capacity or unit screening area processing capacity.
3.3.8 Performance test results, write a test report, draw conclusions on the performance characteristics of the prototype, analyze the existing problems, put forward improvement suggestions, and explain whether production tests can be carried out.
4 Production test
4.1 Test purpose
GB8697-88
Through production tests, assess the reliability, safety, economy, performance stability of the prototype under the conditions of use, the wear resistance of the main components and wearing parts, and the convenience of use and maintenance. 4.2 Test conditions and requirements
Test conditions and requirements shall comply with the provisions of the standard "Performance test conditions and requirements". 4.2.1 The production test of the prototype shall be carried out in a warehouse or processing plant with representative raw materials and installed in the normal production process, generally after three months of continuous production. At least 40 days (two shifts per day) are required to measure the performance of the same batch of raw materials at least three times.
4.2.2 During the production test, a special person shall be designated to observe, measure and record all test conditions. 4.3 Test measurement items and methods
4.3.1 The measurement, adjustment, no-load test of the basic parameters of the prototype and various table records during the test shall be carried out in accordance with the items and methods specified in the performance test part of this standard, and work records shall be made and filled in Table 10. 4.3.2 During the production test, the performance of the prototype is measured, and its items and methods are the same as those in the performance test part of this standard. 4.3.3 For the main vulnerable parts, technical measurements shall be carried out at the same position before and after the test, and the service time and material processing volume of the parts shall be counted and filled in Table 9.
If parts (including vulnerable parts) are replaced during the test, technical measurements and inspections shall be carried out on the new parts and the replaced parts, and the service time and material processing volume of the replaced parts shall be counted and filled in Table 9. 4.3.4 During the production test, the working conditions of the prototype shall be observed, measured and recorded. The working hours, adjustments, number and time of failures of each shift, power consumption, material processing volume, etc. a.
The working conditions, damage, deformation parts and causes, failure causes and elimination methods, operation, vibration, noise and sanitation of the prototype; b.
The convenience and flexibility of operation and use, reliability, maintenance cycle, content, convenience, time required for installation and removal of main vulnerable parts, parts c.
The quantity and labor intensity of the parts; d. The reliability of the prototype work, the stability of the work quality and adaptability, etc. 4.3.5 Calculation of several indicators
Processing capacity: Same as 3.3.5.3 of this standard.
4.3.5.2 Calculation formula for unit power consumption:
4.3.5.3 Reliability in use
×100%
Where: E—reliability in use, %;
t2—actual working time per shift within the production assessment time, h; t3—failure time per shift within the production assessment time, h. After the production test is completed, organize the test data, analyze the test results, and make a production test report. 5 Test summary report
(8)
·(9)
After the test is completed, the "performance test report" and "production test report" should be organized and summarized. After full discussion and comprehensive analysis, a summary report is proposed, the contents of which are as follows:
Test purpose, time, location, organization and test conditions;a.
Prototype introduction (purpose, main structure, process flow, technical characteristics, etc.);b.
Performance test results;
Production test results;
Comparative analysis with test data of machines of the same type;e.
Existing problems and suggestions for improvement;
Conclusion;
Test responsible unit, participating units and personnel; i
GB869788
Appendix: tables, graphs, special reports, pictures, etc. of relevant test data. Table 2 Technical characteristics of TCQS squirrel cage primary cleaning screen series products Equipment model, name:
Measurement date:
Measurement items
Nominal width of screen sleeve
Diameter of screen drum
Screen hole size
Processing capacity per unit screen width
kg/cmh
Processing capacity
Equipped power
Overall dimensions
Anchor installation dimensions
Equipment weight
Cleaning screen drum
Inspecting screen sleeve
Cleaning screen drum
Inspecting screen cylinder
Cleaning screen sleeve
Inspecting screen sleeve
Providing unit:
Measurement location:
Nominal value
Measured value
Measurer:
Equipment model, name :
Measurement date:
Measurement items
Nominal width of screen
Length of screen
Screen hole size
Screen tilt angle
Number of screen vibrations
Times/min
Processing capacity per unit screen width
kg/cm-h
Processing capacity
Overall dimensions
Equipment weight
Equipment model and name:
Measurement date:
Measurement items
First layer
Nominal width of mesh belt
Length of mesh belt conveyor
Linear speed of mesh belt
Processing capacity per unit screen width
kg/cmh
GB8697-88
Table 3 TQLZ self-balancing vibrating screen Technical characteristics of series products provided by:
Measurement location:
Nominal value
Second layer
Third layer
First layer
Measured value
Second layer
Table 4 Technical characteristics of TCQW mesh belt primary cleaning screen series products provided by:
Measurement location:
Nominal value
Measured value
Third layer
Measurer:
Measurement item
Processing capacity
Sieve hole size
Overall dimensions
Equipment weight
Equipment model and name:
Measurement date:
Measurement item
Sieve shell specification dxl
Sieve shell speed
Sieve hole size
Feed section/discharge section
Processing capacity
Sieve hole arrangement
Feed section/discharge section
Overall dimensions
Equipment weight
GB8697-88
Continued Table 4
Nominal value
Measured value
Table 5 Technical characteristics of TCQY circular primary cleaning screen series products Provided by:
Measurement location:
Nominal value
Measured value
Measurer:
Measurer:
GB8697-88
Table 6 Performance test
Test location:
Test date:
Machine model and name:
Provided by:
Dust collection system
*The measuring point should be indicated.
Test and measurement record
Measurer:
GB8697-88
Variety:
Origin:
Dust collection system
Preparer:
Test time
Power consumption
Electric meter reading
Power consumption
Machine model and name:
Providing unit:
Measurer:
Machine model:
Test date:||tt ||In the air
Material containing large impurities in the machine
GB8697--88
Performance test measurement record
Test date:
Test location:
Remove large impurities
Processing volume
Product:
Origin:
Test sieve
Remove large impurities
Processing volume
Form filler:
Grain content of large impurities%
Grain content of large impurities||tt ||Full grain mass
Machine heavy debris mass
Table 8 Performance test measurement record
Provided by:
Test location:
Operation condition (such as whether it is stable?), operation and maintenance conditions are severe
Measurement position
Bearing temperature rise measurement point
Unit power consumption
Unit screen width
Processing capacity
kg/cm+h
Structural design
Reasonableness
Manufacturing Quality
(left)
(right)
GB8697-88
Continued Table 8
Operation conditions (such as whether it is stable?), operation and maintenance conditions Bearing housing temperature
Bearing housing temperature
Sanitary conditions, working conditions, etc.
Note: The vibration column should indicate the installation conditions, Table 9 Registration form for wear, deformation and damage of parts Equipment name:
Test date:
Parts
Providing unit.
Test location:
Name code
Wear condition
Wear parts
Measurer:
Deformed parts
Deformation or
Cause of damage
Measurer:
Equipment name:
Total processing capacity
GB8697-88
Provided by:
Actual working time
Start and end
kw·h/t
Start and end of this machine
Use reliability
Failure time
Table 10 Production test
Start and end of non-machines
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