This standard specifies the technical requirements and test methods for loss monitors for grain combine harvesters. This standard applies to loss monitors installed on self-propelled and trailed grain combine harvesters. JB/T 5672-1991 Loss Monitor for Grain Combine Harvesters JB/T5672-1991 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 5672-1991
Loss Monitor for Grain Combine Harvester
Issued on September 13, 1991
Implemented on July 1, 1992 by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Loss Monitor for Grain Combine Harvester
1 Subject Content and Scope of Application
JB/T5672-1991
This standard specifies the technical requirements and test methods for loss monitors for grain combine harvesters (hereinafter referred to as loss monitors). This standard applies to loss monitors installed on self-propelled and towed grain combine harvesters. Reference Standards
ZBY003
3 Technical Requirements
General Technical Conditions for Instrument Packagingwww.bzxz.net
3.1 The loss monitor can transmit and amplify the impact frequency of about 40Hz. 3.2 The loss monitor can distinguish the impact of grains and other debris. 3.3
The installation position and structural dimensions of the loss monitor sensor should enable the grain loss rate displayed by the loss monitor to represent the total grain loss.
The monitoring data of the loss monitor should not be affected by mechanical vibration or noise. The reliability requires an average trouble-free working time of 2400h. 3.5
The power supply requires DC12±1.2V or DC24±2.4V, with the negative pole grounded. The loss monitor will not be damaged if the power polarity is reversed. The loss monitor will not be damaged if all external wires are short-circuited or open-circuited. The insulation resistance of the loss monitor should comply with the provisions of Table 1. Table 1
Sensor output terminal-sensor housing
Monitor output terminal-housing
Monitor power terminal-housing
3.10 The loss monitor and sensor should be able to work normally in the presence of dust. 3.11
The cables and plugs used in the loss monitor shall be dustproof, waterproof, splashproof and oil-resistant. The cables used in the loss monitor shall be special cables with oil-resistant plastic braided jackets. 3.13 Environmental conditions
3.13.1 Temperature
Storage range: -40~+55℃;
Extreme working range: -10~+60℃;
Rated use range: 0~50℃.
3.13.2 Humidity
Rated use range: 20%~90%RH;
Approved by the Ministry of Machinery and Electronics Industry on September 13, 1991, 50
Implemented on July 1, 1992
Storage range: ≤85%RH.
JB/T5672—1991
3.13.3 The loss monitor should be able to adapt to field conditions with vibration and impact. 3.13.4 Workbench tilt drop
The test instrument drop height: 100mm, angle 45°. Mechanical components should not have cracks and obvious deformation; electrical components should not have obvious displacement or falling off.
3.14 Appearance
The shell of the loss monitor, the coating on the surface of the parts, the panel and the nameplate should be smooth and intact, without peeling and scratches, and the fasteners should not be loose or damaged.
4 Test method
4.1 The test voltage of the loss monitor's adaptability to the power supply should be DC12±1.2V or DC24±2.4V. When the test voltage is fed, it should gradually increase from 10.8V (or 21.6V) to 13.2V (or 26.4V) within 5~10s, and the monitor can work normally. 4.2 Insulation resistance
The insulation resistance should be measured with a megohmmeter with a rated voltage of DC500V under the conditions of temperature of 15~35℃ and relative humidity not more than 75%.
4.3 Laboratory calibration
4.3.1 Input a 40Hz audio signal into the loss monitor, and the display should show. Input a signal below 5Hz into the loss monitor, regardless of the signal strength, the display should not show anything.
4.3.2 Let the grains fall evenly and hit the sensor, and the loss monitor can measure it correctly. 4.3.3 The output signal generated by a single grain (wheat) falling freely from a height of 100~300mm and hitting the sensor can trigger the circuit well and display the impact signal of each grain. 4.3.4 Short stems or husks fall on the sensor, and the loss monitor does not display. 4.4 Field calibration
Field calibration is carried out when the combine harvester is working in the field. The grain loss rate is first measured manually and then matched with the loss rate displayed on the loss monitor.
4.4.2 Grain loss rate
The grain loss rate N is calculated according to formula (1):
N;=n. +ne ×100%..
Where: n is the weight of free grain separated from the straw discharged by the machine in the measurement section, g; n is the weight of free grain separated from the weeds discharged by the machine in the measurement section, g; - is the weight of grain collected from the grain bin in the measurement section, g. n
4.4.3 After repeating the test, the corresponding relationship between the grain loss rate and the display value of the loss monitor can be obtained. 4.5 Sand and dust test
4.5.1 The monitor power supply is turned off and placed in the sand and dust box. The air in the test box can circulate to keep the sand and dust in suspension. a. Sand and dust composition: sand 70%, chalk 15%, kaolin 15%; b. The diameter of sand and gravel particles should not be greater than 200μm; 2
JB/T 56721991
c. Sand and gravel volume: 0.1% of the effective volume of the test box; d. Temperature in the box: 40±2℃;
e. Test time: 2h.
During the test, the platform on which the instrument is placed should move horizontally. 4.5.2 Take out the instrument, wipe off the dust on the surface, and then open the case to check whether there is obvious sand and dust infiltration. 4.6 Ambient temperature test
Put the instrument in a constant temperature box and connect the power supply. After preheating, adjust the temperature in the box to 50℃ (or 0℃ in a low temperature box) and keep it warm for 4 hours (the temperature change in the box should not exceed 2℃). Then check the working status of the monitor. 4.7 Humidity test
4.7.1 Turn off the power supply of the instrument and put it in a humid box. First, adjust the temperature in the box to 40℃ and keep it for 1 hour to achieve thermal equilibrium. Then input water vapor to make the temperature reach 40℃ and the relative humidity reach 90% within 1 hour. During the 48h test time, the temperature change in the box should not exceed 2℃, and the relative humidity change should not exceed 3%. 4.7.2 After the test time is reached, immediately measure the insulation resistance in the box, then connect the power supply of the instrument, and check the working status of the instrument within the specified preheating time.
4.8 Vibration test
Same as the test method for the speed monitor of the grain combine harvester. 4.8.1 The vibration test is carried out on a vibration test bench. a. Frequency cycle range: 5~55Hz;
b. Amplitude (single amplitude): 0.19mm;
c. Holding time: 10min;
d. Working state: non-working state;
e. Vibration direction: X, Y, Z.
After the test, the instrument under test shall be visually inspected. The mechanical components shall not be damaged, cracked, deformed, or have loose fasteners, etc. 4.8.2
phenomenon.
4.9 Workbench tilt drop test
4.9.1 Place a layer of plywood with a thickness of 20mm on the cement floor. The plywood shall maintain rigid contact with the cement floor. Rotate 45° with each side of the bottom surface of the instrument under test as the axis, raise the corresponding side by 100mm, and then let the instrument fall freely. If the instrument under test is allowed to have more than one working placement state, each state shall be carried out in the same way as above. Conduct a visual inspection of the instrument under test.
4.9.3 After the vibration and drop tests, test the instrument respectively. 5 Inspection rules
1 Factory inspection
The factory inspection of the loss monitor shall be carried out in accordance with Table 2. It can only be shipped after passing the inspection, and a product certificate shall be attached. Table 2
Technical requirements Clause
Test method Clause
Power supply voltage
Insulation resistance
Laboratory calibration
Type inspection
JB/T56721991
Type inspection shall be carried out in accordance with all clauses of the test method of this standard. 6
Marking,
Packaging and storage
The loss monitor shall have a nameplate, which shall indicate: manufacturer's name or factory logo;
b. Product name and model;
c. Product number;
d. Measuring range;
e. Year and month of manufacture.
Should comply with the provisions of ZBY003.
6.3 Storage
Spare parts After the wheat harvest every year, if the machine has no cab and is stored in the open air, the loss monitor, sensor and accessories should be removed, the dirt should be cleaned, and maintenance should be carried out. Then it should be properly stored in a ventilated room with a temperature of 5~40℃ and a relative humidity of no more than 85%. The indoor air should not contain corrosive and volatile gases. Additional notes:
This standard was proposed and managed by the Chinese Academy of Agricultural Mechanization Sciences of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Chinese Academy of Agricultural Mechanization Sciences. The main drafters of this standard were Lv Yitai and Hong Liang. A
People's Republic of China
Mechanical Industry Standard
Grain Combine Harvester Loss Monitor
JB/T56721991
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
1/16 Printing Sheet 1/2 Number of Words 8.000
Format 880×1230
First Edition in December 1991
First Printing in December 1991
Print Quantity 1-500
Price 1.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_9
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