This standard specifies the test method for the mixing performance and power consumption of vertical feed mixers. JB/T 7320-1994 Test method for vertical feed mixers JB/T7320-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7320-94
Test Methods for Vertical Feed Mixers
Published on 1994-07-18
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1995-07-01
Mechanical Industry Standard of the People's Republic of China
Test Methods for Vertical Feed Mixers
Subject Content and Scope of Application
JB/T 7320-94
This standard specifies the determination method for the mixing performance and power consumption of vertical feed mixers (hereinafter referred to as vertical mixers). This standard applies to the mixing performance test and production test of vertical mixers. 2 Reference standards
GB1353
GB3768
GB5667
GB5918
GB6971
3 Test content
Determination of sound power level of noise source-simple method Agricultural machinery production test method
Determination of mixed uniformity of compound feed
Test method of feed crusher
Mixing performance test;
Production test.
4 Test conditions
Test material Corn flour is processed from the second-grade corn specified in GB1353. The geometric mean diameter of corn flour is not more than 1.004.1
mm, and the geometric particle uniformity is not more than 2.5. The particle size determination shall comply with the provisions of GB6971. 41.1
4.1.2 The moisture content of corn flour shall not exceed 20%, and its determination method shall comply with the provisions of GB6971. 4.1.3 The loose density of corn flour shall comply with the provisions of GB6971. 4.2 Tracer
Methyl violet is ground and sieved through a 0.1mm (150 mesh/inch) standard cylindrical woven sieve. The mass of tracer added in a batch is one hundred thousandth of the mass of the batch mixture. bZxz.net
4.3 After adding the test corn flour, add the tracer at the additive inlet at one time. Pre-mixing is not allowed. 4.4 Other types of test materials and tracers can be used equivalently. 4.5 The physical property parameters of the test materials are recorded in Table 1. 5 Performance test of vertical mixer
The purpose of the performance test is to assess whether the machine meets the design requirements, whether the mixing quality meets the requirements of feed production and the rationality of the power matching.
5.1 Performance measurement
The mixing performance is measured according to the optimum mixing time and rated batch mixing quality in the instruction manual. The measuring sample is adjusted to the best technical state.
Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
JB/T7320-94
Measure the no-load speed and load speed of the vertical mixer and record them in Table 2. 5.1.1
5.1.2 The mixing cycle is calculated according to formula (1) and the results are recorded in Table 2. T, = T, + T; + T,
Where: T. Mixing cycle, min;
T. Time required for the sample to be loaded into the mixer, min; (1)
T; - Mixing time (the time when the tracer is added to the mixer is the mixing start time, and the time when the discharge door is opened is the mixing end time), min; T. - Discharge time, min.
5.1.3 Vertical mixer power consumption, continuously measure three mixing cycles, record the power consumption in each cycle respectively, and record the average mixing power in Table 2.
Where: N—vertical mixer power, kW; N.
Power consumption in any mixing cycle, kW·h: T——any mixing cycle, min.
5.1.4Productivity is calculated according to formula (3), and the results are recorded in Table 2. 60m.
--Productivity, t/h;
Where: Q
Rated batch mixing mass of mixer.t;
-Number of measurements, n≥3.
5.1.5 Natural residual rate of materials in mixing chamber
After each natural discharge of materials, the mixing chamber is thoroughly cleaned. Record the mass of residual materials, calculate the natural residual rate according to formula (4), and record it in Table 2.
Natural residual rate, %;
Where P
Residual weight of material in mixing chamber. t.
5.1.6·Vertical mixer noise is measured according to the method specified in GB3768. 5.2 Sampling
Samples are taken at equal intervals at the mixer outlet, or other equivalent methods are used for sampling. 5.2.1 Number of samples
5.2.2 Sampling weight
5.2.3 Number of tests
5.3 Sample analysis
The number of samples taken for each batch of test materials shall not be less than 10. The weight of each sample is 100-150g.
At least three tests shall be conducted under the same working conditions, and the results shall be recorded in Table 3. (4)
Measured in the laboratory by chemical or physical methods, see Appendix (Supplement). It can also be measured by other proven effective methods with the same effect, and recorded in Table 3.
5.4 Calculation of mixing uniformity
5.4.1 Sample standard deviation
Where: X, - tracer dosage value (concentration or extinction value) of each analyzed sample: X,)2
X, - tracer mean value (concentration or extinction value mean) of the analyzed sample, which should have no significant difference with the standard sample (significance level 2
is 5%);
Number of samples;
Sample standard deviation.
Sample coefficient of variation
Where: Cv
Sample coefficient of variation,%.
5.4.3 Mixing uniformity
Where: M-
Mixing uniformity,%.
Production test
JB/T7320-94
M=(1-C)×100
The purpose of production test is to assess the reliability, economical use and regional adaptability of the prototype. 6.1 The pure working time of the production test shall not be less than 300h for at least one machine. 6.2 The production assessment shall be carried out in accordance with the provisions of GB5667. Test report
The test results shall be sorted and recorded in a summary table, analyzed comprehensively, and a report shall be submitted (relevant figures and photos may be attached). Test report content:
Test purpose and requirements;
Structural introduction and technical characteristics of the test prototype; Test start and end time;
Test conditions;
Test conclusions and suggestions;
Test unit.
Table 1 Test material properties table
Geometric mean diameter d
Particle uniformity
Loose density
Moisture content
Measurement time:
Manufacturer:
Total volume
Effective volume
Continuous mixing time
No-load speed
Load speed
Test time:
Basic test material
Tracer
Tracer dosage
JB/T7320-94
Table 2 Mixer parameters and performance measurement table
Measurement serial number:
Measurement location.
Productivity t/h
Vertical mixer parameters
Equipped power
Load starting power
Residual rate
Rate (or torque)
Mixing power
Batch mixing weight
kg/batch
Feeding time
Table 3 Mixing uniformity measurement table
Mixing time
Discharging time
Tester:
Test serial number:
Tester Test location:
Mixed batch
kg/batch
Approved sample quantity
Number of determinations
Tester:
A1 Methyl violet method
A1.1 Instruments and reagents
JB/T7320-94
Appendix A
Test method for sample uniformity of mixing
(Supplement)
The reagent is methyl violet, the colorimetric blood is 0.5cm, and the spectrophotometer test wavelength is 590nm. A1.2 Sample processing
Each sample drawn is divided into four parts for analysis. A1.2.1 Pour the sample onto a smooth table or glass plate, hold a sample divider in each hand, scoop up the sample from the opposite side and pour it down, repeat 4 to 5 times, use the sample divider to divide the inverted cone finally formed by the sample material into four equal parts from the center, take out two triangular cone parts with opposite vertices, and repeat the above method to divide the remaining sample until the mass of the two triangular cone samples with opposite vertices is slightly more than the analytical sample. A1.2.2 Weigh 10.0g of analytical sample from each sample. A1.3 Inspection procedure
Take 50.0g of the same batch of corn flour without tracer is placed in a 500mL Bessel's triangular flask, and then 150mL A1.3.1 Blank Reagent
Ethanol is shaken and left to stand, shake once every 10 minutes, repeat 2 to 3 times, and filter out through quantitative filter paper after about 30 minutes. It is used as a blank reagent.
A1.3.2 Standard Sample
Use an analytical balance with a sensitivity of 0.01mg to weigh 1.00mg of methyl violet (the same batch as the one added in the test), place it in a 500mL Bessel's triangular flask, then add 100g of corn flour and 300mL of ethanol, shaken and left to stand, shake once every 10 minutes, repeat 2 to 3 times, and filter out through quantitative filter paper after about 30 minutes, adjust to zero with blank reagent, and measure the tracer dosage value (extinction value and concentration value) of the standard sample. A1.3.3 Other methods can be used to prepare standard samples equivalently. A1.3.4 Sample test Place the sample for analysis in a 100mL Bessel's triangular flask, add 30mL ethanol, shake it and then place it still. Shake it every 10 minutes or so, repeat 2~3 times for about 30 minutes, filter it out through quantitative filter paper and place it in a test tube, and then place the filtrate in a cuvette. Use a spectrophotometer adjusted with standard samples to measure the tracer dose value (extinction value or concentration) of each analytical sample, and record the measurement results in Table 3.
Additional Notes:
This standard was proposed and managed by the Chinese Academy of Agricultural Mechanization Sciences. This standard was drafted by the Chinese Academy of Agricultural Machinery. The main drafters of this standard are Zhao Heping and Chen Shuzheng. 5
People's Republic of China
Machinery Industry Standard
Vertical Feed Mixer Test Method
JB/T 7320-94
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (PO Box 8144, Beijing
Copyright reserved
Postal Code 100081)
No Reprinting
Sheet 1/2 Words 10,000
Format 880×1230
First Edition April 1995
First Printing April 1995
Print Quantity 00,001-500
Price RMB 4.00
Serial No. 94-084
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