This standard specifies the technical requirements and test methods for the speed monitor of grain combine harvesters. This standard applies to speed monitors used to monitor the speed of each shaft of self-propelled and towed grain combine harvesters. JB/T 5671-1991 Speed ​​monitor for grain combine harvesters JB/T5671-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5671-1991
Speed ​​monitor for grain combine harvesters
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
Mechanical Industry Standard of the People's Republic of China
Speed ​​monitor for grain combine harvesters
Subject content and scope of application
JB/T5671-1991
This standard specifies the technical requirements and test methods for speed monitors for grain combine harvesters (hereinafter referred to as speed monitors). This standard applies to speed monitors used to monitor the speed of each axis of self-propelled and towed grain combine harvesters. 2 Reference standards
General technical conditions for instrument packaging
ZBY003
3 Type
3.1 Speed ​​monitors are divided into: magnetic control type:
b. Magnetic induction type:
c. Contact switch type:
d. Light needle type.
3.2 Speed ​​monitors are divided into: a. Header type:
b. Digital type:
c. Indicator light and buzzer alarm type according to the display mode.
4 Basic parameters
4.1 Measuring range
150~1500r/min; 300~3000r/min. 4.2 Alarm speed range
150~1500r/min.
5 Technical requirements
Measurement error is shown in Table 1.
Technical indicators
Basic error
Linearity error
Repeatability error
Approved by the Ministry of Machinery and Electronics Industry on September 13, 19910.5
Implemented on July 1, 1992
5.2 Average time between failures 2400h.
5.3 Sensitivity
JB/T5671-1991
When the speed monitor uses the meter display, its sensitivity is the minimum scale value: when it uses the digital display, the sensitivity is ±1 word. 5.4 The power supply requires DC12±1.2V or DC24±2.4V, with the negative pole grounded. 5.5 The speed monitor will not be damaged if the power polarity is reversed. 5.6 The speed monitor will not be damaged if all external wires are short-circuited or open-circuited. 5. 7
The speed monitor sensor should be suitable for installation on the transmission shaft of Φ20~50mm. 5.8 Insulation resistance
When conducting insulation resistance test, its insulation resistance should comply with the provisions of Table 2. Table 2
Sensor output terminal-sensor housing
Monitor output terminal-housing
Monitor power supply terminal-housing
The accuracy of the monitor and sensor should remain unchanged after 0.3MPa pressure washing and degreasing with detergent. 5.9
5.10The monitor and sensor should be able to work normally in dust and rain. 5. 11
The sensor should be able to work normally in the presence of splashing fuel and oil. The cable-plug socket adopts dust-proof, waterproof and splash-proof connectors. The cable adopts oil-resistant, plastic braided jacket special multi-core cable. 5.14 Environmental conditions
Storage range: -40~+55℃;
b. Extreme working range: -10~+60℃:
Rated use range: 0~50℃.
5.14.2 Humidity
a. Rated use range: 40℃; 20%~90%RH: b. Storage range: 50℃; ≤85%RH. 5.14.3 Vibration
The speed monitor should be able to adapt to the field vibration and impact resistance. 5.14.4 Workbench tilt drop
The drop height of the tested instrument: 100mm.
Number of drops: Take the four sides of the bottom as the axis, drop once each, a total of 4 times. 5.15 Appearance
The housing of the sensor and monitor, the coating on the surface of the parts, the panel and the nameplate should be smooth and intact, without peeling and scratches. The fasteners should not be loose or damaged, and the movable parts should be flexible and reliable. 6 Test method
6.1 Basic error, linearity error and repeatability error test 2
6.1.1 Basic error
JB/T5671-1991
Take 1/5 of the range as one test point, measure 11 points in the upper and lower strokes of the full range, and measure 3 cycles. The basic error (a;) is calculated according to formula (1):
n;-n×100%
Where: n—test point speed, r/min
n.—test point nominal speed, r/min:
Upper limit of the range, r/min.
6.1.2 Linearity error
The linearity error is measured simultaneously with the basic error, and the linearity error (a,) is calculated according to formula (2). ay.
×100%
Wherein: f is the difference between the arithmetic mean n of the actual speed of the upper and lower strokes measured three times at the same test point and the nominal speed n. 6.1.3 Repeatability error
The repeatability error can be measured simultaneously with the basic error. The maximum difference △f between the actual speeds measured three times at the same test point at the same stroke is obtained, and then the repeatability error (a) is calculated according to formula (3): a,
6.2 Sensitivity test
The monitor sensitivity test is carried out on the speed test bench. When the speed is adjusted to the minimum scale value, the monitor should have a display. 6.3 Monitor adaptability to power supply
The test voltage is carried out according to the requirements of Article 5.4. When the test voltage is fed, it should be gradually increased from 10.8V (or 21.6V) to 13.2V (or 26.4V) within 5~10s, and the monitor can work normally. 6.4 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%.
6.5 Sand and gravel test
The power supply of the monitor is turned off and placed in the sand and dust box. 6.5.1
The air in the test box can circulate so that the sand and dust are in a suspended state. Sand and dust composition: sand 70%, chalk 15%, kaolin soil 15%; a.
b. The diameter of sand and gravel particles should not be greater than 200μm; c. The amount of sand and gravel is 0.1% of the effective volume of the test box; d. The temperature in the box: 40±2℃:
e. Test time: 2h.
During the test, the platform on which the instrument is placed should move horizontally. 6.5.3 Take out the instrument, wipe off the dust on the surface, then open the case and check that no sand or dust has penetrated. 6.6 Rain Test
The power supply of the instrument is disconnected and placed in the rain box. 6.6.1
JB/T5671-1991
Subject the instrument to rain spray from two directions, vertical and 45°. 6.6.21
a. Rainfall: (5±2) mm/min;
b. Temperature in the box: 5~40℃:
c. Test time: 2h.
During the test, the platform on which the instrument is placed should move horizontally. 6.6.3 Take out the instrument, wipe off the water stains on the surface, then open the case and check that no rain has penetrated into the interior. 6.7 Ambient temperature test
6.7.1 Place the instrument in a constant temperature box and connect the power supply. After the preheating time, 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℃.
6.7.2 After the test period expires, check the basic error according to Table 1 when the temperature in the box remains unchanged. 6.7.3 When it is necessary to detect the temperature effect error, the instrument should be tested after reaching thermal equilibrium at the specified temperature value. 6.8 Humidity test
6.8.1 Turn off the power supply of the instrument and place 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 48-hour test time, the temperature change in the box should not exceed 2℃, and the relative humidity change should not exceed 3%. 6.8.2 After the test period, measure the insulation resistance in the box, then turn on the power of the instrument, and detect the basic error within the specified preheating time. 6.9 Vibration test
6.9.1 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.
6.9.2 After the test, the instrument under test should be visually inspected. The mechanical components should not be damaged, cracked, obviously deformed, or have loose fasteners.
6.9.3 After testing, the instrument under test should meet the accuracy requirements of Table 1. 6.10 Workbench tilt drop test
6.10.1 Workbench tilt drop test Place a layer of plywood with a thickness of 20mm on the cement floor. The plywood should maintain rigid contact with the cement floor. Rotate 45° with each side of the bottom surface of the test instrument as the axis, raise the corresponding side to 100mm, and then let the instrument fall freely. If the test instrument is allowed to have more than one working placement state, each state should be carried out in the same way as above. 6.10.2 Visually inspect the test instrument. The mechanical components should not be broken or obviously deformed; the electrical components should not be obviously displaced or falling off.
6.10.3 After the drop test, test the instruments separately. 7 Inspection rules
7.1 Factory inspection
The factory inspection of the instrument shall be carried out in accordance with the technical requirements and test methods in Table 3. It can only be shipped after passing the inspection, and a product certificate shall be attached. 4
Measurement error
Sensitivity
Supply voltage
Type inspection
JB/T5671-1991
Factory inspection items
Technical requirements clauses
Type inspection is carried out in accordance with all clauses of this standard test method. Packaging and storage
Marking,
The instrument should have a nameplate, which should indicate:
a. Manufacturer name or factory mark:
b. Product name and model:
c. Product number:
d. Measuring range:
e. Accuracy grade;
f. Year and month of manufacture.
8.2 Packaging
Should comply with the provisions of ZBY003.
8.3 Storage
Test method clause
Instruments, sensors and accessories, spare parts After the wheat harvest each year, if the machine has no cab and is stored in the open air, the instrument should be dismantled, 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 turbid gases.
Additional instructions:
This standard was proposed and managed by the China Agricultural Mechanization Science Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the China Agricultural Mechanization Science Research Institute. The main drafters of this standard were Lv Yitai and Hong Liangchen. 5
People's Republic of China
Mechanical Industry Standard
Speed ​​Monitor for Grain Combine Harvester
JB/T 56711991
Published and issued by the China Academy of Mechanical SciencebZxz.net
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
1/16 Sheet 1/2
Word Count 10.000
Format 880×1230
First Edition in December 1991 First Printing in December 1991 Printing Quantity 1-500
Price 1.00 Yuan
Mechanical Industry Standard Service Network: http://wwwJB.ac.cn6
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