Some standard content:
ICS65.060.50
Machinery Industry Standard of the People's Republic of China
JB/T9700-1999
Forage Harvesting Machinery
General Rules of Test Methods
Rules of test methods for machines of hay harvestingPublished on August 6, 1999
National Bureau of Machinery Industry
Implementation on January 1, 2000
JB/T9700-1999
This standard is a revision of NJ417-86 "General Rules of Test Methods for Forage Harvesting Machinery". During the revision, the original standard was edited, and the main technical content remained unchanged. This standard replaces NJ417-86 from the date of implementation. This standard was proposed and managed by Hohhot Animal Husbandry Machinery Research Institute. The drafting unit of this standard: Hohhot Animal Husbandry Machinery Research Institute. The main drafter of this standard: Yang Tiejun.
This standard was first issued on July 30, 1986. 1 Scope
Machinery Industry Standard of the People's Republic of China
Forage Harvesting Machinery
General Rules of Test Methods
Rules of Test Methods for Machines of Hay Harvesting This standard specifies the general test methods for forage harvesting machinery. This standard is applicable to field tests of forage harvesting machinery. 2 Referenced Standards
JB/T9700-1999
Replaces NJ417—86
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T5667—1985 Agricultural Machinery Production Test Methods 3 General Requirements
3.1 Select test instruments with corresponding accuracy according to the requirements of the tested machine, and inspect and calibrate them before the test. 3.2 The supporting power should be consistent with the requirements of the tested machine, the test unit should be adjusted to the best state, and the working conditions should not be changed during the test.
3.3 When there is no special requirement in the test area, sampling shall be carried out at five points selected by the diagonal method. 3.4 The length of the measurement area shall not be less than 20m. For baling and stacking machines, the length of the measurement area shall fully meet the amount of grass required to form a bale or stack.
4 Determination of test conditions
4.1 Meteorological conditions
Weather conditions such as air temperature, relative humidity, wind speed and wind direction are obtained from meteorological stations near the test site. If the specific meteorological conditions have a great impact on the test results, observations should be made at the test site. 4.2 Selection of test sites
4.2.1 The selection of test sites should comply with local ecological protection regulations. 4.2.2 The growth status of the test sites and plants should be representative. 4.3 Surface conditions
4.3.1 Select a plot of land of appropriate size according to the test project, measure and calculate its area. 4.3.2 Describe the undulating conditions of the surface in words, whether there are furrows, earth mounds, grass mounds (tower heads), stones, etc., and explain their size, density and direction of furrows.
4.3.3 The terrain slope is measured by an inclinometer or a level, and the relationship between the slope and the forward direction of the unit is explained. 4.4 Soil conditions
4.4.1 Describe the soil type of the test site in words. Approved by the State Bureau of Machinery Industry on August 6, 1999, implemented on January 1, 2000
JB/T9700-—1999
4.4.2 Soil firmness: Each point is divided into 0~5cm, 5~10cm, and 10~15cm layers, and measured with a soil firmness meter. 4.4.3 The absolute soil moisture content shall be determined in layers according to 4.4.2. Samples of no less than 30 g (excluding stones, plant residues and other debris) shall be taken from each layer and weighed immediately. Then, the samples shall be dried at a constant temperature of 105°C until the weight remains unchanged and then weighed dry. The absolute soil moisture content shall be calculated according to formula (1): H.
Ws—wet weight of soil, g:
Wg—dry weight of soil, g.
4.5 Plant conditions
Wts-Wig
4.5.1 Describe in words the grassland type, vegetation conditions and the growth and development period of the main forage grasses, as well as the row spacing of the forage grasses. (1)
4.5.2 Natural height of forage grasses and stem diameter: The natural height of forage grasses is the vertical distance from the ground to the highest part of the forage grasses (excluding awns) under natural conditions. The stem diameter refers to the diameter at the specified cutting height. For natural grassland, 30 plants are selected at each point, and for planted grassland, 10 plants are selected at each point, and the average value is calculated.
4.5.3 Degree of lodging: Use words to describe how much of the test area the lodging area accounts for, and select representative forage grasses in the lodging area to measure their lodging angles. For forage grasses with a natural height of more than 30 cm, measure the angle between the line connecting the main stem base 30 cm upward and the base and the vertical line to the ground: For forage grasses with a natural height of less than 30 cm, measure the angle between the line connecting the top of the main stem and the base and the vertical line to the ground. A lodging angle of less than 20 indicates no lodging, 21 to 50 indicates moderate lodging, and more than 50 indicates severe lodging. 4.5.4 Moisture content of forage grass: The sample taken at each point shall not be less than 100g, and shall be dried at a constant temperature of 105°C until the weight remains unchanged, and calculated according to formula (2): W-We(100% *
Where: H. Moisture content of grass:
Wet weight of grass, g:
WeDry weight of grass, g.
4.5.5 Fresh grass yield, grass density, proportion of main grasses, leaf-grass ratio and grass yield. Take an area of 1m2 at each point, cut the part above the specified stubble height, and obtain the following data. 4.5.5.1 Fresh grass yield: weigh the fresh grass and calculate the fresh grass yield per square meter. 4.5.5.2 Grass density: count the number of grass roots and calculate the grass density per square meter. 4.5.5.3 Proportion of main grasses: weigh the weight of each type of main grass separately and calculate their respective proportion of the total weight. Percentage. 4.5.5.4 Leaf-to-grass ratio: Take a sample of no less than 100g to separate the stem from the variegated leaves. The leaf sheath of Gramineae forage grass is included in the stem, and the spike is included in the leaf: The leaf of Leguminosae forage grass should include leaflets, leaflet stalks and receptacles. After drying, weigh the stem and variegated leaves separately, and calculate according to formula (3): B
Forage leaf-to-grass ratio:
WWherein: B
Weight of the variegated leaves after drying, g:
WWeight of the stem after drying, g.
4.5.5.5 Grass yield: Converted into the hay yield per hectare with a moisture content of 16%, calculate according to formula (4): Gsx=104gst
（3）
Where: Gx dry grass yield per hectare, kg/ha: gst
5 Performance test
JB/T9700-1999
Average fresh grass yield per square meter, kg/m2. 5.1 Mowing operation. During the test, the round trip shall be no less than twice, and two points shall be measured each time. 5.1.1 Actual cutting width: Measure the distance between the edges of two adjacent cuttings. 5.1.2 Stubble height: In a 1m square box placed flat on the ground, select five points according to the diagonal method, and measure the stubble height upward with the lower plane of the box as the reference. Measure five roots at each point and calculate the average value. 5.1.3 Cross-sectional shape of the grass swathe and weight of each meter of grass swathe: On the cross-section of the grass swathe, measure the height of one point every 10cm to determine the cross-sectional shape. And take a 1m long grass swathe and weigh it.
5.1.4 Plant length after mowing: For natural grassland, take 3 at each point 0 plants or more. For the planting grassland, take more than 10 plants at each point, measure the full length of the plants (excluding awns), and calculate the average value.
5.2 Grass floor operation. During the test, the round trip should be no less than two times, and the horizontal grass floor machine should have no less than three grass strips. Measure three points each time. During the operation, the relationship between wind speed, wind direction and the forward direction of the unit should be measured. 5.2.1 Actual floor width: Measure the distance between the edges of two adjacent floor widths. 5.2.2 Grass strip cross-sectional shape and grass strip weight per meter: Measure according to the method of 5.1.3, and calculate the average height and average cross-sectional area. 5.2.3 Use words to describe the laying quality of grass strips. Use formula (5) to formula (8) to calculate the grass strip density, standard deviation and coefficient of variation: P=
Where: P—
Grass strip density at each measuring point, kg/m:
G Grass strip weight per meter at each measuring point, kg/m:
F Cross-sectional area at each measuring point, m.
Where: P
Where: S
Average density of grass strips, kg/m:
Number of measurement points, times.
Standard deviation of grass strip density, kg/m.
Where: V.-
Coefficient of variation of grass strip density.
(100%
5.3 Determination of power index. During the measurement, the round trip shall be no less than twice. For machines such as round bale rolling machines and pick-up stacking machines, which have large changes in power consumption during operation, the measurement should be carried out when close to full load. 5.3.1 Total power consumption of traction machines
N, =N. +N. +N
Where: N——total power, kW;
Na—traction power, kW;
N—mechanical transmission power, kW
—hydraulic transmission power, kW.
5.3.1.1 Traction power N.
Where: PaWww.bzxZ.net
—traction force, N:
unit operating speed, m/s.
5.3.1.2 Mechanical transmission power N.
Where: M
Total transmission shaft torque, N·m;
Total transmission shaft speed, min-\.
5.3.1.3 Hydraulic transmission power N
Where: P
Working pressure, Pa:
-Working flow, L/min.
JB/T9700-1999
5.3.2 Total power consumption of suspended or self-propelled implements NP, V
Nz=N+N+N
Where: N
Where: M
Traveling power of the unit, kW.
-Torque of the driving wheel, N·m:
-Speed of the driving wheel, minl.
(12)
(13)
5.4 Glide rate and slip rate. For traction implements, the ratio of the difference between the actual travel distance and the theoretical travel distance (slip distance) to the theoretical travel distance is called the slip coefficient, and its percentage is the slip rate. For suspension and self-propelled implements, the ratio of the difference between the actual travel distance and the theoretical travel distance (slip distance) to the theoretical travel distance is called the slip coefficient, and its percentage is the slip rate. Calculate according to formula (15).
Where: g
L-2 yuan Rn
2 yuan Rn
(100%
slip rate or slip rate, positive value is slip rate, negative value is slip rate: L. —Actual travel distance of the wheel, m:
(15)
R is the wheel radius (from the axle center to the outer edge for steel wheels, and the dynamic radius for rubber wheels, that is, the distance from the axle center to the ground), m; n
is the number of revolutions of the wheel within the measured distance. Production test
Production test shall be carried out in accordance with GB/T5667.
People's Republic of China
Mechanical Industry Standard
Animal Husbandry General rules for test methods of grass harvesting machinery
JB/T9700-1999
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
100044)
Word count 10,000
1/16 Printing sheet 1/2
Format 880×1230
First edition in December 1999 First printing in December 1999 Price 5.00 yuan
Print run 1-500
99-1316
Mechanical Industry Standard Service Network: 661_006/
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