This standard specifies the field test method for rotary mowers. This standard applies to field tests for rotary mowers. JB/T 5154.1-1999 Test method for rotary mowers JB/T5154.1-1999 Standard download decompression password: www.bzxz.net

ICS 65.060.50
Machinery Industry Standard of the People's Republic of China
JB/T5154.1-1999
Rotary Mowers
Test Methods
Test methods for rotary mowers
Published on August 6, 1999
State Machinery Industry Bureau
Implemented on January 1, 2000
JB/T 5154.1—1999
This standard is a revision of NJ27782 "Field Test Method for Rotary Mowers". Compared with NJ277-82, the main technical content of this standard has been changed as follows: In the test conditions and pre-test preparation, JB/T9700—1999 "General Rules for Test Methods for Forage Harvesting Machinery" is directly quoted
In the production test, GB/T5667--1985 "Production Test Methods for Agricultural Machinery" is directly quoted. This standard replaces NJ277--82 from the date of implementation. Appendix A of this standard is a reminder appendix.
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 drafters of this standard: Yang Tiejun, Qian Xin. This standard was first issued on December 14, 1982. Scope
Machinery Industry Standard of the People's Republic of China
, Test Methods
Rotary Mowers
Test methods for rotary mowers
This standard specifies the field test methods for rotary mowers. This standard applies to field tests of rotary mowers. 2 Referenced Standards
JB/T 5154.1—1999
Replaces NJ 27782
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 all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T56671985 Test methods for agricultural machinery production JB/T97001999
General rules for test methods for forage harvesting machinery
3 Test conditions and preparation before the test
The determination of meteorological conditions, surface conditions, soil conditions, plant conditions, as well as the selection of test requirements and test sites shall be in accordance with the provisions of JB/T9700
The main instruments, meters and tools required for the test are shown in Appendix A (Suggested Appendix) 4 Performance test
The purpose of the performance test is to assess whether the performance of the machine meets the design requirements. 4.1 The performance test should be carried out in a relatively flat plot with representative forage growth. The length of the measuring area should not be less than 20m, and the length of the stable areas at both ends should not be less than 20m respectively. During the test, the round trip should be measured twice. In order to eliminate the influence of the side row or the front machine, one trend should be harvested before the measurement, and then the measurement should be started.
4.2 Cutting quality includes cutting width, cutting height, re-cutting rate, grass breakage rate, over-stubble loss rate and width of grass strips laid after cutting. 4.2.1 Determination of cutting width
For each stroke, measure at least two locations equidistantly within the measuring area, and calculate the cutting width utilization coefficient according to formula (1): A
Where: K is the cutting width utilization coefficient;
A is the average actual cutting width, m;
A is the theoretical cutting width, m.
4.2.2 Determination of cutting height
While measuring the cutting width, take a 1m long steel ruler placed flat on the ground as the reference, measure the cutting height of the whole cutting width one by one, and measure 10 plants at equal intervals each year
Approved by the State Machinery Industry Bureau on August 6, 1999 and implemented on January 1, 2000
4.2.3 Determination of grass fragmentation
JB/T5154.1-I999
Grass sections below 7cm are grass fragmentation. Check at least two places at equal intervals in each stroke within the measuring area. In the forward direction of the machine, take 1m for a width of less than 2m, and take 0.5m for a cutting width greater than 2m. The ratio of the weight of the broken grass in the whole radiation range to the weight of the grass cut in this range is the grass cutting rate, which is calculated according to formula (2):
In the formula: S—
-grass cutting rate:
G,—grass cutting weight, g:
G.——weight of cut grass, easy.
4.2.4 Determination of recutting rate
×100%
In the measurement area of ​​4.2.3, the ratio of the average number of dead grass nodes per square meter at each measurement point to the average number of grass plants per square meter is the recutting rate, which is calculated according to formula (3):
Grass recutting rate:
In the formula: S-wwW.bzxz.Net
×100%
Z——the average number of dead grass nodes per square meter at each measurement point, nodes/m; Z
——the average number of plants per square meter at each measurement point, plants/m. In the formula: z.—
-the average number of dead grass nodes per square meter at each measuring point, node/m; - the sum of the number of dead grass nodes per square meter at the measuring point, node/m; - the number of measuring points.
In the formula: Z—the number of dead grass nodes per square meter at the measuring point, node/m\; Z——the number of dead grass nodes within the measuring point, node;
F. The area of ​​the measuring point, m
4.2.5 Determination of excess stubble loss rate
(4)
In the measuring area of ​​4.2.3, the ratio of the actual loss caused by stubble cutting that exceeds the local animal husbandry technical requirements to the total weight of grass to be cut is the excess stubble loss rate, which is calculated according to formula (6):
Formula Where: S. Over-stubble loss rate;
G. Increased stubble loss, g;
-total weight of forage to be cut, easy
×100%
Where: G. Weight of cut forage, easy
4.2.6 Width of grass strips
Measure at two locations equidistantly within the measurement area
4.3 Power measurement of rotary mower
4.3.1 No-load power measurement of rotary mower
JB/T 5154.11999
The power of the rotary mower at rated speed when no-load is calculated according to formula (8): N
-no-load power, kW;
Where: N-
M-+-T total transmission shaft torque of working parts when no-load, N·m; n-T total transmission shaft speed of working parts, r/min. 4.3.2 Determination of load power of rotary mower
When the rotary mower is operating at the working speed specified in the manual, the power measured at its rated speed is calculated according to formula (9): N,
Where: N, load power, kW:
nT. Total transmission shaft speed of working parts, r/min; -T. Total transmission shaft torque of working parts, N·m. M.-
4.3.3 The traction power of the rotary mower is calculated according to formula (10): N.
Where: N
Traction power, kW:
P, — Traction force. N;
Machine T. Operating speed, m/s.
4.3.4 The total power consumed by the mower during operation is calculated according to formula (11): N= N,+N.
Where: N-
Total power, kW:
N, — Load power, kW:
Traction power, kW.
4.3.5 The power consumed per unit width is calculated according to formula (12): N.
Where: N—Power consumed per unit width, kW/m; N—Total power, kW;
5Production test
—Average actual cutting width, m.
Production test is carried out in accordance with GB/T5667
The operation volume of production test: planting grass, cutting radius per meter is not less than 53ha; natural grass per mu is not less than 67ha81
6 Test report
JB/T 5154.1—1999
6.! After the test: the test measurement and observation results should be sorted out and summarized, and the test report (with relevant photos attached) should be written after full discussion and comprehensive analysis by the test participants and relevant personnel of the user department3. 6.2 The test report should include:
a) Test purpose:
b) Structural introduction and technical characteristics of the test prototype:
c) Local animal husbandry technical requirements and test conditions:
d) Test results and analysis;
e) User opinions:
|) Problems and improvement suggestions:
g) Conclusions and opinions.
Soil static load bearing instrument
Soil moisture meter
Drying box
Balance (sensitivity 0.1g)
Anglometer
Vernier caliper
50m tape measure
2m steel tape measure
Steel ruler (30cm)
Steel ruler (1m)
100m measuring rope
Camera
Command flag, E1 sentry
Calculator
Sample box
JB/T5154.1-1999
Appendix A
(Indicative Appendix)
Main instruments, meters and tools required for the test Instruments for measuring power and traction
1 each
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