GB/T 39546-2020 in English
VALIDEquipment for crop protection—Knapsack motorized air-assisted sprayers—Test methods and performance limits
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$291.00
| Standard No: | GB/T 39546-2020 |
| Document status: | VALID |
| Title in English: | Equipment for crop protection—Knapsack motorized air-assisted sprayers—Test methods and performance limits |
| Title in Chinese: | 植物保护机械 背负式风送喷雾机 试验方法和性能限值 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 65.060.40-Plant care equipment |
| Chinese Classification: | B91-Farming machinery and tools |
| Professional Classification: | GB-National Standard |
| Related Keywords: | standard test items technical indicators test methods spray volume
air-assisted sprayers test methods key test methods test points immersion test |
| Related Topics: | Plant Protection Mechanical Wind Tunnel
spray machine plant protection performance plants mechanical back plant protection machinery GBT39546 GB/T 39546-2020 Salt spray testing machine service life Nanjing fan performance test bed Back test General test methods for plant protection machinery |
《GB/T 39546-2020植物保护机械 背负式风送喷雾机 试验方法和性能限值》由TC201（全国农业机械标准化技术委员会）归口，TC201SC1（全国农业机械标准化技术委员会植保与清洗机械分会）执行，主管部门为中国机械工业联合会。
Introduction
Analysis of the core requirements of the standard
| Test items | Technical indicators | Test methods |
|---|---|---|
| Spray volume | ±15% rated value deviation | 5.3 Horizontal/80° dual angle test |
| Liquid residue | ≤250mL | 5.4 Emptying weighing method |
| Droplet size | Dv0.5±5% | 5.9 Laser diffraction method |
Details of key test methods
1. Ground deposition potential test
According to the requirements of clause 5.10 of the standard, a petri dish array was used to arrange test points within a range of 12 meters, and the uniformity of fog flow distribution was determined by the weighing method. During the test, ensure:
- Nozzle center height (1000±20)mm
- Petri dish spacing 500mm (main axis)
- Additional point spacing 250mm
2. Corrosion resistance test
72-hour immersion test in accordance with Clause 5.12:
Typical failure case: The mass of a certain model of rubber sealing ring increased by 12% in 10% acetone solution, exceeding the standard limit of 10%, causing the sprayer to leak.
Implementation recommendations
Maintenance points
- Check the curvature of the air flow hose every month (Clause 4.7)
- Calibrate the scale error of the liquid tank before operation (≤5%)
- Regularly replace filters with ≤2μm filter screens
Technology evolution analysis
Compared with the 2006 version of the standard, the main improvements of the 2020 version are:
- Added technical requirements for droplet size analyzer (5.1.10)
- Refine the dimensions of the vertical deposition test frame (Appendix B)
- Strengthen environmental protection requirements (Clause 7.a)
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