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LY/T 1934-2020: (Garden machinery Mounted lawn trimmer powered by gasoline (diesel) engine)
Status: Valid LY/T 1934: Evolution and historical versions
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| LY/T 1934-2020 | English | 259 |
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(Garden machinery Mounted lawn trimmer powered by gasoline (diesel) engine)
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LY/T 1934-2020
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| LY/T 1934-2010 | English | 439 |
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Garden machinery. Ride-on machines with lawn mowers
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LY/T 1934-2010
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PDF similar to LY/T 1934-2020
Basic data | Standard ID | LY/T 1934-2020 (LY/T1934-2020) | | Description (Translated English) | (Garden machinery Mounted lawn trimmer powered by gasoline (diesel) engine) | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B95 | | Word Count Estimation | 11,186 | | Date of Issue | 2020-12-29 | | Date of Implementation | 2021-06-01 | | Older Standard (superseded by this standard) | LY/T 1934-2010 | | Regulation (derived from) | Announcement No. 25 (2020) of the State Forestry and Grassland Administration | | Issuing agency(ies) | State Forestry and Grassland Administration | LY/T 1934-2020: (Garden machinery Mounted lawn trimmer powered by gasoline (diesel) engine)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Garden machinery-Petrol (diesel) engine powered ride-on lawnmowers
People's Republic of China Forestry Industry Standard
Replace LY/T 1934-2010
Garden machinery powered by gasoline (diesel) diesel engine
Mounted lawn trimmer
2020-12-29 released
2021-06-01 implementation
Issued by the State Forestry and Grassland Administration
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces LY/T 1934-2010 "Garden Machinery Mounted Lawn Mower". Compared with LY/T 1934-2010, except for editing
The main technical differences outside of the sexual modification are as follows.
- The name of the document is changed from "Garden Machinery Mounted Lawn Mower" to "Garden Machinery is powered by gasoline (diesel) diesel engines
Mounted lawn trimmer", and revise its English name;
-Modified the content of the "Normative Reference Documents" (see Chapter 2, Chapter 2 of the.2010 Edition);
-Modified the method of product model compilation (see Chapter 4, Chapter 4 of the.2010 edition);
---Added the requirements and inspection content of "mowing height" (see 6.3.1);
-Amend the "Radio Disturbance Characteristics Limit" to "Electromagnetic Compatibility" and modify its content (see 6.4.1,.2010 edition 6.4.2);
---Added the requirements and inspection contents of "gasoline engine emission performance" (see 6.4.2);
--Modified the content of "safety requirements" (see 6.4.4, 6.9 in.2010 edition);
---Added "reliability" requirements and inspection methods (see 6.5);
--The content of "Anti-aging test of warning labels and nameplates" has been newly added (see 7.1.1.3).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed and managed by the National Forestry Machinery Standardization Technical Committee (SAC/TC 61).
Drafting organizations of this document. Fujian Jinjiang Sanli Locomotive Co., Ltd., Ningbo Daye Garden Equipment Co., Ltd., Zhejiang Changjiang Machinery
Machinery Co., Ltd., Zhejiang Zhongjian Technology Co., Ltd., Yangzhou Weibang Garden Machinery Co., Ltd., Lvyou Machinery Group Co., Ltd.,
South German Certification and Testing (China) Co., Ltd. Shanghai Branch.
The main drafters of this document. Liu Qingguo, Hu Dingsheng, Wu Wenming, Jiang Jinbiao, Yang Haiyue, Ke Zhongyu, Cao Huichang, Chen Long.
This document was first published in February.2010, and this is the first revision.
Garden machinery powered by gasoline (diesel) diesel engine
Mounted lawn trimmer
1 Scope
This document specifies the model of a mounted rotary blade lawn trimmer powered by a gasoline (diesel) engine (hereinafter referred to as "mounted lawn mower")
Preparation, technical requirements and test methods, signs, instructions for use, packaging, transportation and storage.
This document applies to mount-type rotary knife lawn trimmers and mount-type hob lawn trimmers powered by gasoline (diesel) diesel engines.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated reference documents,
Only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document
file.
GB/T 191 Packaging, storage and transportation pictorial signs
GB/T 1147.1 Medium and small power internal combustion engines Part 1.General technical conditions
GB/T 1147.2 Medium and small power internal combustion engines Part 2.Test methods
GB/T 6388 Transport packaging receiving and dispatching signs
GB/T 9480 Rules for the compilation of manuals for agricultural and forestry tractors and machinery, lawn and garden power machinery
GB 10396 General rules for safety signs and hazard graphics for agricultural and forestry tractors and machinery, lawn and garden power machinery
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 15706 General Principles of Mechanical Safety Design Risk Assessment and Risk Reduction
GB 20891 Limits and measurement methods of exhaust pollutants from diesel engines for non-road mobile machinery
GB/T 21398 Electromagnetic compatibility test methods and acceptance rules for agricultural and forestry machinery
GB 26133 Limits and measurement methods for exhaust pollutants from small ignition engines for non-road mobile machinery
GB/T 38364.1 Garden machinery. Safety requirements for lawn trimmers powered by internal combustion engines. Part 1.Terminology and general tests
GB/T 38364.3 Garden machinery. Safety requirements for lawn trimmers powered by internal combustion engines. Part 3.Mounted lawn trimmers
JB/T 5135.1 General Small Gasoline Engine Part 1.Technical Conditions
JB/T 5135.2 General Small Gasoline Engine Part 2.Bench Performance Test Method
JB/T 5135.3 General small gasoline engine Part 3.Reliability and durability test and evaluation method
LY/T 1621 Garden Machinery Product Model Compilation Method
QC/T 518 Specification for tightening torque of threaded fasteners for automobiles
3 Terms and definitions
The following terms and definitions defined in GB/T 15706 and GB/T 38364.1 apply to this document.
4 Model preparation method
The preparation method of the product model of the mounted lawn mower is carried out in accordance with the regulations of LY/T 1621.
Mounted lawn mowers use cutting width (in millimeters) as the main performance parameter, rounded up to the nearest decimal point; based on engine displacement (single
The position is cubic centimeters) as the main power parameter, which is rounded to the nearest whole number. The specific method of model preparation is shown in Figure 1.
5 basic parameters
The main performance parameters and structural parameters of the mounted lawn mower, as well as the main technical parameters of the supporting power, should be included in the manual or provided for the user.
Given in other technical documents of the user. Mass-produced mounted lawn mowers should conform to the technical parameters given by them, and the main technical parameters should be at least
include.
a) Engine displacement, cm3;
b) Maximum engine power, kW;
c) Fuel tank volume, L;
d) Cutting width, mm;
e) Adjusting range of mowing height, mm;
f) The number of mowing height gears;
g) The maximum no-load speed of the tool, r/min;
h) Maximum driving speed, km/h;
i) Front and rear wheel specifications;
j) Overall dimensions (length×width×height), mm;
k) Net weight of the whole machine, kg;
l) The volume of the grass collector (if applicable), m3;
m) The minimum turning circle diameter, m.
6 Technical requirements and test methods
General requirements
6.1.1 The mounted lawn mower should be able to operate normally under the following environmental conditions.
a) The height of grass on the lawn does not exceed 300 mm;
b) The slope of the site is not more than 15º;
c) The altitude does not exceed 1,000 m;
d) Ambient temperature -5 ℃～40 ℃;
e) Humidity ≤90%, no rain;
f) Lawn without stones, wires, sticks, metal objects and other foreign objects.
6.1.2 During the inspection, relative to the specified value or actual value, the accuracy of all control values or measured values should be within the following tolerance range.
a) Size. ±0.5 mm;
b) Speed. ±10 r/min;
c) Displacement. ±1%;
d) Volume. ±1%;
e) Time. ±0.1 s;
f) Quality. ±1%.
Performance of matching gasoline (diesel) diesel engine
6.2.1 Requirements
The performance of the diesel engine for the mounted lawn mower should meet the requirements of GB/T 1147.1.
The performance of the gasoline engine matched with the mounted lawn mower should meet the requirements of JB/T 5135.1.
6.2.2 Inspection
The performance test of the diesel engine is carried out in accordance with the provisions of GB/T 1147.2.
The performance test of the gasoline engine is carried out in accordance with the regulations of JB/T 5135.2 and JB/T 5135.3.
Overall performance
6.3.1 Mowing height and gear
6.3.1.1 Requirements
Mounted lawn mowers should have at least 3 mowing height gears, and should be easy to adjust; the actual mowing height measurement at any cutting position
The deviation between the value and the given value in the manual should be within ±5 mm.
6.3.1.2 Inspection
By controlling the shift mechanism, check whether the clutch of each gear is flexible and reliable. When checking the height of the mowing, place the mounted lawn mower on a level ground
On the surface, adjust to each cutting gear according to the method given in the manual, and measure (with an accuracy of ±0.5 mm) the tip of the knife at each cutting position.
For the distance from the ground, take the minimum value measured as the mowing height value, and calculate whether the deviation is within the set range.
6.3.2 Maximum no-load speed of the tool
6.3.2.1 Requirements
In the no-load state of the mounted lawn mower, the measured maximum no-load speed of the tool should be within the range of 95% to 110% of its calibration value.
6.3.2.2 Inspection
Combine the pruning tool, the mounted lawn mower runs stably at the maximum no-load speed of the tool in situ, and the speed of the tool is directly measured by the tachometer
(Allowable measurement error ±10 r/min); for machines where the tool is directly connected to the engine output shaft, it can also be measured by the engine spindle
The speed method indirectly measures the maximum no-load speed of the tool.
6.3.3 Grass gathering performance
6.3.3.1 Requirements
For mount lawn mowers with grass collectors, the amount of fragments that can be collected in the grass collectors should not be less than 80% of the nominal volume of the grass collectors, that is, the grass catching rate
Should not be less than 80%.
6.3.3.2 Inspection
6.3.3.2.1 Test lawn
Choose warm-season obtuse-leaf grass or cold-season perennial ryegrass as the test lawn. The height of the grass is greater than 60 mm.
The rain has not been sprinkled.
6.3.3.2.2 Site preparation
The mowing height of the mounted lawn mower is set to the gear closest to 60 mm, and the commissioning is completed according to the regulations of the manual, and the grass collector is installed.
Cut out a large enough lawn to be tested in the test site. If the grass height of the lawn to be tested is 60 mm ± 5 mm, the test can be carried out directly.
6.3.3.2.3 The actual grass collecting quality measurement of the grass collector
Remove the broken grass on the surface of the lawn to be tested before the test.
The mowing height of the mounted lawn mower is set to the gear closest to 30 mm, and the grass collector is installed according to the instructions. The lawn is to be tested.
Perform normal pruning until the grass collector cannot collect grass. Stop the rotation of the cutting tool and fix the mount lawn mower in a horizontal state,
Remove the grass collector and collect the scraps of grass collected in the grass collector. Repeat the test three times or use three machines of the same specification to test each time. respectively
Weigh the mass of the grass collected in the three trials (allowable measurement error ±1%), and take the arithmetic average of the three trials as the actual grass collector
quality.
6.3.3.2.4 Nominal volume of grass collector
In addition, prepare a grass collector with the same volume as the manufacturer’s instructions (allowable error ±0.5%), and its diameter and height are the same.
For standard cylindrical containers with a tolerance of ±10%, the pieces cut from the three tests in 6.3.3.2.3 shall be broken without applying external force.
Fill the standard container with grass, weigh the mass of the grass collected in the container, repeat three times, and take the arithmetic average of the three times as the nominal volume of the grass collector
Collect grass quality.
6.3.3.2.5 Sloppy
The sloppy rate is calculated according to formula (1).
η-grass collection rate, %;
m1--the actual mass of grass collected by the grass collector, in grams (g);
m2-the nominal volume of the grass collector, the mass of the grass, the unit is grams (g).
Note. In the case of a certain grass collection density, the grass collection volume percentage is equal to the grass collection mass percentage, so the grass collection mass percentage is used instead of the grass collection volume percentage.
6.3.4 Maximum travel speed
6.3.4.1 Requirements
The actual measured value of the maximum travel speed of the mounted lawn mower should be within the range of 95% to 105% of its calibration value.
6.3.4.2 Inspection
6.3.4.2.1 Test conditions
The test conditions for the maximum travel speed are as follows.
a) Test on a pavement (or other similar test surface) with a strong, dry, smooth, and hard concrete level (gradient not exceeding 1%)
get on.
b) The distance of the test interval is 100 m, and the allowable deviation range is controlled within ±0.5%. At both ends of this test interval, there are sufficiently long
Auxiliary driving section to ensure that the machine's driving speed can reach its maximum driving speed before reaching the measurement start point.
c) Mounted lawn mower has all the devices installed according to the regulations of the manual, and the debugging is completed.
d) The weight of the operator is (75±5) kg.
e) The test environment conditions should meet the following requirements.
1) Atmospheric pressure is not less than 97 kPa;
2) The temperature is not less than 5 ℃;
3) The relative humidity is not more than 95%;
4) The wind speed is not more than 3 m/s.
e) The measurement tolerances are as follows.
1) Driving speed. ±3%;
2) Tire inflation pressure. ±5%;
3) Time. ±0.1 s.
f) Number of measurements. One round trip counts as one time.
g) If the test result does not satisfy that the difference between the round-trip speed is less than 5%, then repeat...
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