MH/T 1067-2018Helicopter spray quality index and detection method (English PDF)

4.1 Flow

The spraying equipment developed or introduced should be used to measure the ground flow and air flow of the system before and during use. For the measurement method, see MH/T 6.5 in 1031-2010.The flow rate deviation should not be greater than 10%. The system flow requirements for different spraying methods are shown in Table 1.

4.2 Effective spray width

The effective spray width should be measured before and during use of the spraying equipment developed or introduced. For the measurement method, see Chapter 5: Common light helicopter See Appendix A for technical parameters such as effective spray width of machine spraying equipment.

4.3 Droplet diameter and droplet spectrum width

The spraying equipment developed or introduced should be measured before and during use of the droplet diameter and the width of the droplet spectrum. For the measurement method, see Chapter 5.different the droplet diameter requirements for spraying methods are shown in Table 2, and the droplet spectrum width requirements for different types of equipment and different spraying methods are shown in Table 3.

6.1 Detection area

It should be selected with good clearance conditions, wide field of vision, no tall obstacles, relatively horizontal ground, not less than 300 m in length, and not less than 100 m in width the area as the test site.

6.2 Meteorological conditions

When testing, the meteorological conditions of the testing area should meet the following requirements.

a) The weather is fine and the wind speed does not exceed 4 m/s;

b) The temperature is 20 °C~30 °C, and the relative humidity is not less than 50%;

c) The horizontal visibility is not less than 5 km;

d) The cloud height is not less than 1 km.

6.3 Sampling line

The setting direction of the sampling line should be perpendicular to the flying direction, and the obstacles on the surface should be avoided as much as possible when setting up. The length of the sampling line should be determined according to the test purpose degree. At least three sampling lines are set for each test item.

6.4 Samples

6.4.1 The material, specification and model of the sampling sheet should meet the requirements of the testing index, usually water-sensitive paper, thermal paper or magnesium oxide glass slides are used as sampling sheet.

6.4.2 The interval sampling method should be adopted. A sampling point is set every 1 m~5 m on the sampling line, and one or more sampling slices can be set at each point.

6.4.3 Sampling slices should be recovered 30 s after the fog drops are deposited, and sampling slices should be properly collected and stored to avoid damage and moisture.

6.4.4 Professional measuring instruments should be used to observe the sample pieces, and the measuring instruments and analysis software used should meet the measurement and analysis requirements.

6.5 Detection medium

Appropriate liquids for testing should be selected, clean water should be used for constant and low volume testing, and mines with a flash point above 70 °C should be used for ultra-low volume testing.

物油。 Material oil.

6.6 Local interview car

For local interview vehicle requirements, see 5.3 of MH/T 1031-2010.

6.7 Flight test

The flight speed and altitude should be basically the same as those during production operations; the flight direction should be parallel to the wind direction or at an angle within 20°. When testing, should Ensure that the spray control valve is open within 100 m before and after the sampling line. The time for each spray test shall be no less than 10 s.

6.8 Other

6.8.1 During testing, ensure smooth ground-air communication.

6.8.2 The abnormal situation found during the inspection shall be contacted, checked and dealt with in time, and relevant records shall be made.

7.1 Equipment performance index parameters

7.1.1 Flow

Calculate the flow of a single nozzle or atomizer and the entire system based on the test results, and repeat at least three times. Calculate the average flow rate and deviation rate.

7.1.2 Effective spray width

Calculate the effective spray width according to the method in 4.4 of MH/T 1040-2011.

7.1.3 Droplet diameter and droplet spectrum width

Use professional measuring instruments to determine the volume median diameter and number median diameter of each sampling line, and repeat at least three times. Calculate the median volume the average value of the diameter and the number median diameter and its ratio. The average volume median diameter is used to represent the droplet diameter, and the ratio is used to represent the droplet spectrum width.

degree.

7.2 Operation quality index parameters

Refer to Chapter 5 of MH/T 1002.1-2016 for the calculation method of operation quality index parameters.