This standard specifies the performance test and production test methods for pellet feed presses. This standard applies to the test of ring die hard pellet feed presses. Test items may be increased or decreased according to the characteristics of the machine model and the purpose of the test. Other types of pellet presses may also be used as a reference. JB/T 5169-1991 Test methods for pellet feed presses JB/T5169-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5169-1991
Test Methods for Pellet Feed Press
Published on May 18, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1992
Mechanical Industry Standard of the People's Republic of China
Test Methods
Pellet Feed Press,
1 Subject Content and Scope of Application
JB/T5169-1991
This standard specifies the performance test and production test methods for pellet feed press (hereinafter referred to as pellet press). This standard is applicable to the test of ring die hard pellet feed press. The test items are allowed to be increased or decreased according to the characteristics of the machine model and the purpose of the test, and other types of pellet presses can also be used as a reference. 2 Reference standards
GB6971
GB3768
GB5667
3 Performance test
3.1 Test purpose
Test method for feed mill
Determination of sound power level of noise source
Simplified method
Test method for agricultural machinery production
The purpose of the performance test is to assess the performance index and technical and economic index of the machine. 3.2 Test conditions and requirements
The technical characteristics of the test prototype are recorded in Table 1. 3.2.2
The test site and prototype installation should meet the requirements of performance measurement. 3.2.3
The test power shall be an electric motor, and its power shall comply with the provisions of the instruction manual or the supporting requirements. 3.2.4
The test voltage is 380V, and the deviation is ±5%. The average load of the motor during the test shall not exceed 110% of the rated power. The materials, water, steam and power supply used in the test shall meet the requirements of the test. 3.2.7 The test instruments, meters, measuring tools and tools are shown in Appendix C (reference). They must be calibrated and qualified before the test as required. The feed formula used in the test is shown in Appendix A (supplement). 3.2.8
3.3 Preparation before performance test
3.3.1 Determination of physical properties of mixed powder, the results are recorded in Table 2. 3.3.1.1 Moisture content
Select 3 evenly distributed points in the mixed powder for sampling, 50g of each sample, put the samples into aluminum boxes and weigh them immediately, dry them at a constant temperature of 105℃ until the weight remains unchanged, and weigh them again (weighing accuracy ± 0.1g). Calculate the moisture content according to the following formula and find its average value. w.-w
Wherein: H
Relative moisture content, %;
Weight of sample before drying, g;
Weight of sample after drying, g.
Approved by the Ministry of Machinery and Electronics Industry on May 18, 1991 W
Implemented on January 1, 1992
3.3.1.2 Particle size
JB/T5169-1991
Measured according to Appendix B (Supplement) of GB6971. 3.3.1.3 Density
Select 3 evenly distributed points in the mixed powder for sampling, calculate the density according to the following formula, and find the average value. p=
Wherein: e
Density of mixed powder, g/cm2;
mSample weight, g;
L—Sample volume, cm.
3.3.2 Measure the ambient humidity and temperature of the test site and record them in Table 3(2)
3.3.3 Adjust the prototype to the best technical state according to the requirements of the instruction manual, record the running time of the prototype before the test, measure the gap between the die and roller, and record the measurement results in Table 3.
3.3.4 Measure the pressure and temperature of the steam before entering the pellet press, and record the results in Table 3. 3.4 No-load test
Measure the following items after idling for 10 minutes, and record the results in Table 4. 3.4.1 The no-load power, voltage and current of the main and auxiliary motors and the whole machine shall be measured 3 times in total. 3.4.2 The main shaft, agitator shaft, feeder shaft and speed shall be measured 3 times in total. 3.4.3 Noise shall be measured in accordance with Article 6.4 of GB3768. 3.5 Load test
After 10 minutes of load operation, the following measurements are carried out at the same time, and the measurement results are recorded in Table 4. 3.5.1 The pressure and temperature of the steam before entering the pelletizing machine are measured every 5 minutes, for a total of 3 measurements, and the average value is calculated. 3.5.2 Moisture uniformity of materials before pelletizing
Take 50g of the water-containing mixed powder before pelletizing from the cover plate of the pelletizing chamber hopper every 5 minutes, for a total of 3 samples, and measure the moisture content according to 3.3.1.1 of this standard, calculate the average value, and calculate the standard deviation according to the following formula. Sh
Where: S
Standard deviation, %;
(H,-H,)
HThe moisture content of the water-containing mixed powder is measured each time, %; H
-Average moisture content, %;
Number of samplings.
3.5.3 Quality of pellet feed
3.5.3.1 Moisture content
Take 50g of pellet feed every 5 minutes at the outlet of the pellet press, take samples 3 times in total, measure the moisture content according to the method described in 3.3.1.1 of this standard, and calculate the average value.
3.5.3.2 Temperature
Take pellet feed once every 5 minutes at the outlet of the pellet press, not less than 1kg each time, and immediately measure the temperature of the pellet feed, measure it 3 times in total, and calculate the average value.
3.5.3.3 Bulk density
JB/T 51691991
Take a certain amount of pellet feed with a length of about 1.5 to 2 times the diameter at the outlet of the pellet press, and directly measure the bulk density of the pellet after cooling with a bulk density meter. If the conditions are not met, the method of measuring the sampling volume and sampling weight can be used to calculate the bulk density of the pellet feed using the following formula. Measure 3 times in total and find the average value.
Wherein: V
bulk density of pellet feed, g/cm2;
sample weight, g;
sample volume, cm.
3.5.3.4Density
Measure according to the device in Figure 1.
1—cylindrical glass container; 2—glass tube; 3—moving ruler; 4—pillar; 5—plumb bob (4)
Add about half of gasoline to a vertical cylindrical container and use a plumb bob to determine whether the device is horizontal. Determine the zero position of the moving ruler based on the gasoline level in the inclined glass tube. Weigh a certain mass of finished pellets and put them into the container. Then use the moving ruler to measure the movement of the gasoline level 1. The volume V occupied by the finished pellets is calculated according to the following formula. V.
Where: V is the volume occupied by the finished pellets, cm; the displacement of the gasoline level is measured with a ruler, cm; K
- measuring equipment constant, 1/cm2;
The K value is determined by the parameters of the measuring equipment and is calculated as follows. K=
π(Dsina+d)
Where: D
The inner diameter of the vertical cylindrical container, cm;
The inner diameter of the inclined tube, cm;
The inclination angle of the inclined tube, (").
JB/T5169-1991
The finished pellet density P, (kg/m) is calculated as follows. P
Where: m is the mass of the finished pellet feed sample, kg; Correction for the dry matter content in the pellet feed: m
Pa=P, (1-W)
Wherein: Pe—dry matter content in finished pellets, kg/m; W pellet feed moisture, %;
Measure 3 times in total and calculate the average value.
3.5.3.5 Compression ratio
Calculate according to the following formula:
Compression ratio of pellet feed;
Wherein: u
P——average density of mixed powder, g/cm2; p
Average density of pellet feed, g/cm2.
3.5.3.6 Firmness
According to Appendix B (Supplementary The firmness of pellet feed is measured by the rotary box specified in the test kit. The pellet feed with a moisture content of 12% to 13% after cooling and drying is placed on a woven sieve with a mesh smaller than the particle diameter by about 1mm. 50g of the sieved material is placed in the rotary box. The rotary box is operated continuously at a speed of 50r/min for 10 minutes. Then the sample is taken out and sieved again with the above woven sieve. After weighing, calculate according to the following formula. X,
Where: Xz—firmness of pellet feed, %; ma
Weight of pellet feed on the sieve after the test, g.
3.5.4 Pure working hour productivity
+×100
At the exit of the pellet press, take pellet feed once every 5 minutes, each time for no less than 1 minute, and then weigh it, for a total of 3 times. Calculate according to the following formula and find the average value.
Pure working hour productivity, kg/h;
Where: Ec
Ec=xW(-H)
WThe weight of pellet feed taken each time, kg; The time of taking pellet feed each time, min
3.5.5 Load power, current, voltage
Measure the load power, current, and voltage of the whole machine and the main and auxiliary motors, once every 5 minutes, for a total of 3 times. 3.5.6 Speed
Measure the speed of the main shaft, agitator shaft, and feeder shaft, for a total of 3 times. 3.5.7 Pure working time ton power consumption
Where: E.
E.=1000
Power consumption per ton of pure working time, kW
--Load power of the whole machine, kW.
3.5.8 Load degree
JB/T 51691991
Measured under rated productivity conditions. Calculate the load degree of the motor according to the following formula. N
n×100
Where:
Load degree, %;
N—Motor load power, kW;
--Motor rated power, kW;
Motor efficiency, %.
3.5.9 Temperature of die and roller
Stop the pellet press after working for 1 hour, and immediately measure the temperature of the inner wall of the die and the roller, then restart it, measure it once every 1 hour of work, and measure it 3 times in total, and calculate the average value.
3.5.10 Forming rate
Take 1~2kg of sample at the exit of pellet press, screen out formed particles and weigh them. When using round hole sieve, the ratio of sieve hole diameter to particle diameter is 0.8; when using square hole sieve, the ratio of side length of each hole to particle diameter is 0.8. Take samples every 5 minutes, do it 3 times in total, calculate according to the following formula, and find the average value.
In the test, the vibration frequency of the sieve is 2Hz, the amplitude is 10mm, and the screening time is 60s. ×100
Where: C
Forming rate, %;
-Forming particle weight, g;
Sampling weight, g.
3.5.11 Noise
The determination method is the same as that of Article 3.4.3.
3.5.12 Dust concentration
Filter membrane preparation: Use tweezers to place the filter membrane on a clean white paper, separate each sheet and do not overlap, then place it in a desiccator, balance for 24 hours, record the temperature and humidity of the laboratory, and weigh it in the balance room. Weigh it again after 1 hour. When the difference between the two weighings does not exceed 0.4mg, the weight is considered constant.
3.5.12.2 Number the weighed filter membrane and record the mass, place it on a special filter membrane clip with tweezers, and put it into the filter membrane box for use. 3.5.12.3 When sampling, first open the filter membrane box, take out the filter membrane clip, and install it on the sampling head. Then open the sampler and adjust the flow meter flow. Generally, the air extraction volume should be selected within the range of 20~60L/min. The sampling time should be determined according to the dust concentration, generally 10min. 3.5.12.4 The measurement can be carried out in an ordinary laboratory, and the measurement starts after the machine has been running for 15min under the calibration condition. 3.5.12.5 The sampling head should face the dust source of the sample machine and keep it parallel to the horizontal plane. The position should be placed where the staff often works, 1m away from the surface of the machine where the dust is generated, and 1.2m above the ground. 3.5.12.6 Remove the filter membrane after sampling with tweezers, place it on a clean white paper, separate it, and do not overlap it. Put it in a dryer to balance for 24 hours, weigh and record,
3.5.12.7 Take two parallel samples at each measuring point. When the concentration deviation of the two samples is less than 20%, the test is valid, and the average value can be taken as the dust concentration at that point. The deviation value of parallel samples is calculated as follows: N,-NwwW.bzxz.Net
N.=(N.+N.)/2
Where: N.
Parallel sample deviation value, %;
N, N2—respective dust concentrations of two parallel samples, mg/m*. 3.5.12.8 The number of measuring points depends on the operating position, and the maximum value measured at the measuring point is taken as the dust concentration of the prototype. (15)
In the formula: N-
Dust concentration calculation
Dust concentration, mg/m;
Weight of filter membrane before sampling, mg;
Weight of filter membrane after sampling, mg;
JB/T51691991
100(W,-W)
After conversion, the volume of the air extraction under standard conditions, L. Ve=V×273+*
actual sampling volume, L;
where: V
temperature recorded during sampling, ℃;
standard atmospheric pressure, Pa;
standard atmospheric pressure=101325Pa;
Patometric pressure recorded during sampling, Pa.
4 Production test
4.1 Purpose of production test
To assess the performance stability, reliability, economy, adaptability and wear resistance of parts and components of the pellet press. 4.2 Production test requirements
4.2.1 The pure working time of each pellet press shall not be less than 200h. 4.2.2 There must be a fixed staff in charge. 4.2.3 Time classification shall be carried out in accordance with Article 2.3 of GB5667. 4.3 Determination of production test
4.3.1 During the production test, strictly follow the provisions of the instruction manual, correctly operate, use, maintain and adjust, always pay attention to the technical status of the pellet press, and keep good work records according to Table 6. 4.3.2 During the production test, at least 3 performance checks shall be carried out according to the requirements of 3.5.3.1, 3.5.3.2, 3.5.3.6, 3.5.4, 3.5.5, 3.5.7, 3.5.8, 3.5.10, 3.5.11 and 3.5.12, with an interval of 150h each time. 4.3.3 Before and after the production test, the dimensions of the main wearing parts should be measured; when parts and components are damaged and need to be replaced, the wear of the damaged parts should be measured, and the cumulative amount of pellets pressed by the parts, the cumulative pure working hours, the cause of damage and the date should be recorded in Table 7. 4.3.4 During the normal test phase, three shifts of production inspections shall be carried out. The working time of each shift shall not be less than 6 hours. The measurements and records shall be made according to the requirements of Table 8, and the following technical and economic indicators of the pellet press shall be calculated according to Article 3 of GB5667. 4.3.4.1 Pure working hour productivity, t/h. 4.3.4.2 Shift hour productivity, t/h. 4.3.4.3 Calibrated unit power productivity, t (kWh). 4.3.5 First trouble-free operation time
Record the working time when the parts (except safety pins) are damaged for the first time, and the results shall be recorded in Table 6. 5 Test report
a. Test purpose;
b.Brief introduction of the test machine;
Test location and conditions;
Conclusion of performance test;
Conclusion of production test;
Test results and analysis;
JB/T5169-1991
Evaluate the repair, maintenance, safety and reliability, and put forward improvement opinions and suggestions; evaluate the machine structure,
performance,
test responsible units, participating units and participants. Table 1
Machine name and model:
Measurement date:
Measurer:
Main motor
Agitator motor
Agitator speed
Feeder motor
Feeder speed
Productivity
Cross-sectional dimensions
Effective length of die hole
Working width
Eccentricity
Technical features
Manufacturing unit:
Measurement location:
Overall dimensions (length × width × height)
Net weight of machine
Recorder:
Machine name and model:
Measurement date:
Feed formula:
Measurer:
Weight of sample before drying
Weight of sample after drying Quantity
Relative moisture content
Mass geometric mean diameter
Mass geometric standard deviation
Machine name and model:
Measurement date:
Measurer:
Molding gap
Relative humidity in room
Vapour pressure
Vapour temperature
Water adding temperature
Test voltage
Operation time before test
JB/T51691991
Determination of physical properties of mixed powder
Determination of performance test conditions of pellet press
Manufacturing unit:
Measurement location:
Recorder:
Manufacturing unit:
Measurement location:
Recorder:
Machine name and model:| |tt||Measurement date:
Feed formula:
No-load power
Load power
No-load power
Load power
Load degree
No-load power
Load power
Load degree
JB/T5169—1991
Table 4 Performance test measurement record
Electricity meter reading
Electricity meter reading
Text/s
Electricity meter reading
Electricity meter reading circle/s
Rated power kw
Load degree
Electricity meter reading
Electricity meter reading
Text/s
Rated power kW
Load degree
Manufacturer:|| tt||Measurement location:
No-load power
Load power
Load degree
Agitator shaft
Feeder shaft
Electric meter reading
Circle/s
Electric meter reading
Circle/s
Rated power kW
Load degree
Weight of sample before drying
Weight of sample after drying
Relative moisture content
Standard deviation
Working temperature of die
Working temperature of roller
Pure working hour productivity
Electricity consumption per ton of pure working time
Weight of sampled particles
Weight of formed particles
Weight of sample before drying
Weight of sample after drying
JB/T 51691991
Continued Table 4
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