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Mechanical Industry Standard of the People's Republic of China
JB5116--91
Sprayer Nozzle
Published on May 18, 1991
Test Method
Implemented on January 1, 1992
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Sprayer Nozzle
Test Method
Subject Content and Scope of Application
This standard specifies the test procedures and methods for hydraulic sprayers, air-driven hydraulic sprayers, and pneumatic sprayer nozzles. JB5116-91
This standard applies to hydraulic nozzles of suspended, traction, self-propelled, stretcher-type agricultural sprayers and backpack spray powder sprayers for plant protection and fertilization and auxin application.
2 Reference standards
GB6959 Terminology of plant protection machinery
GB3101 General principles of quantity, unit and symbol 3 Test liquid
3.1 Clean water without solid suspended matter.
3.2 Clean water, add abrasive (clay powder, clean water and clay powder in a weight ratio of 50:1, and add 0.1% washing powder as a suspending agent). 3.3 Clean water must be added with soluble dye (black aniline dye or similar product) on time, and the surface tension of the mixed liquid should be measured at 20℃ and recorded in the test report.
4 Instruments and equipment
4.1 Instruments
Pressure gauge or pressure sensor, within the effective working pressure range, the accuracy is ±1.0%. 4.1.1
Rubber or plastic pressure hose.
Liquid collector.
Graduating cylinder, balance or flow sensor.
Stopwatch, accuracy ±0.5s.
Scale, accuracy 1mm.
Angle ruler, accuracy ±0.5°.
Sampling dish.
Microscope with micrometer, measuring accuracy 10um; or laser droplet spectrum measuring device. Camera with flash.
Liquid surface (No. 10 motor oil) or solid surface (such as magnesium oxide layer) suitable for collecting droplets. Device to move the nozzle at a specified speed. Ministry of Machinery and Electronics Industry 1991-05-18
1992-01-01
Metal measuring rod (see Figure 1).
4.2 Test bench for the distribution of the amount of spray (see Figures 2 and 3). 100
4.2.1 Requirements for the collection trough:
a. Each trough wall should be upright;
JB5116-91
b. The upper edge of each trough wall should be on the same plane. The deviation from the horizontal plane in the longitudinal direction (perpendicular to the trough) is 1% (10mm/1m); the deviation in the transverse direction (parallel to the trough) is 2% (see Figure 4); c.
The maximum thickness of the trough wall is not more than 4mm;
JB511691
The distance between the tops of adjacent trough walls: 50±0.5mm for a single nozzle test bench and 100±2mm for a multi-nozzle test bench; d.
The minimum height of the upright wall of the trough should be twice the width of the trough, and the total width of the fog distribution test bench should not be affected by the cumulative value of the allowable deviation between the ends of each trough wall.
The upper part of the groove wall is composed of symmetrical bevels or thin walls, the top can be rounded, and should have the following characteristics: the height of the bevel or thin wall should not be less than 3 times the wall thickness; the thickness of the upper end of the bevel or thin wall should not be greater than 1mm; the radius of the rounding should not be greater than 0.5mm;
The distance between any point on the top of the groove wall and the plane formed by the median deviation of the top of each groove wall should not exceed 2mm above or below. 5 General test conditions
5.1 Temperature and relative humidity
During the test, the test temperature and the air temperature of the test air should be between 10 and 25℃, and the relative humidity in the test air should not be less than 50%. The temperature and relative humidity values should be recorded in the test report. 5.2 Pressure
During the test, if the change in pressure value is within ±2.5% of the average pressure value, the test pressure should be recorded in the test report. 6 Method for determination of hydraulic nozzle characteristics
General test conditions shall comply with the provisions of Article 5. For a group of nozzles, the tests of Articles 6.2 to 6.6 shall use nozzles with a spray volume closest to the average value in the test of Article 6.1.
6.1 Determination of consistency of hydraulic nozzle spray volume
6.1.1 Sampling
Randomly select 20 nozzles of the same model and record the sampling conditions, especially the inventory and sampling location, in the test report. All markings of nozzle pieces, water vortex cores and nozzles shall be recorded in the test report. 6.1.2 Test liquid
Use liquid that meets the requirements of Article 3.1.
6.1.3 Determination
Measure the amount of liquid sprayed by each nozzle at the maximum working pressure specified by the manufacturer. The measurement error shall be less than 1%; the measurement time shall be no less than 60s, and the measurement error shall be less than 1s.
6.1.4 Results
The test results shall be recorded in the test report in the form of a curve (50 mm length represents 100%) or a table, where the spray volume of each nozzle is expressed as a percentage of the average spray volume of 20 nozzles. 6.2 Determination of the spray volume of hydraulic nozzles (change of spray volume under different pressures) 6.2.1 Test liquid
Use liquid that meets the requirements of Article 3.1.
6.2.2 Pressure
Use the maximum or minimum pressure specified by the manufacturer and at least two pressures in between. The difference between two adjacent pressures should not exceed 0.5 MPa.
6.2.3 Determination
Measure the spray volume at the pressure specified in Article 6.2.2. The unit is L/min. 6.2.4 Results
The test results shall be recorded in the test report in the form of a graph (spray volume on the Y axis and pressure on the X axis) or a table with the accuracy specified in 6.1.3.
6.3 Determination of the mist distribution of hydraulic nozzles
6.3.1 Test liquid
Liquids that meet the requirements of 3.1 shall be used.
6.3.2 Pressure
The test shall be carried out at the maximum, minimum and operating point pressures specified by the manufacturer. 6.3.3 Position of nozzle
During the test, the nozzle shall be placed vertically on the mist distribution test bench in its normal working state and placed above the top of a slot wall so that the mist flow sprays into the test bench.
Note: If the manufacturer specifies the nozzle position, the test shall be carried out at this position. The nozzle height is measured between the top of the slot wall and the nozzle hole. If the manufacturer specifies the optimum height, the test is conducted at this height and 150 mm above and below; if the manufacturer does not specify the height, the test is conducted at the following heights: 400, 500, 600, 700 mm. If necessary, it can be conducted at 300 mm and 800 mm. Slit nozzles are generally conducted at 500 mm; diversion and conical mist nozzles are generally conducted at 300 mm. The fan-shaped mist nozzle should be placed in an appropriate position for testing so that the long axis of the mist shape is at right angles to the mist collecting groove. The conical mist nozzle should be tested at 2 to 3 positions (see Figure 5). Water sheet or water swirl core
Initial position
Initial position.
Second position
Nozzle sheet
Third position
b. Second position. The nozzle sheet or nozzle cap with spray holes is rotated 90° in their assembly. e, third position. When the swirl plate or swirl core can rotate relative to the nozzle plate, the nozzle should be reinstalled so that the swirl plate or swirl core rotates 90° relative to the nozzle plate below the second position. 6.3.4 Determination
When the amount of liquid collected in a measuring cylinder reaches 90% of the capacity of the measuring cylinder, stop collecting liquid immediately and record the amount of liquid collected in each measuring cylinder. 4
JB5116—91
6.3.5 Results
The distribution of the amount of mist should be expressed in a curve chart (it is recommended to use 50mm length on the Y axis to represent 100% and 10mm length on the X axis to represent 100mm) or a table, and the amount of liquid collected in each slot should be expressed as a percentage of the average amount of liquid in all slots. 6.4 Determination of the change in the amount of mist distribution
The amount of mist distribution of the hydraulic nozzle changes due to nozzle wear or corrosion. This test should be carried out on 5 nozzles. 6.4.1 Test liquid
Use the liquid containing suspended particles specified in Article 3.2. During the test, the temperature of the liquid should be 20±3℃. Ensure that the abrasive is evenly distributed in the test liquid. If necessary, conduct preliminary tests to ensure that the test liquid maintains the grinding efficiency of the nozzle material during the entire test period specified in Article 6.4.3. Otherwise, the grinding liquid should be replaced as often as necessary. 6.4.2 Test pressure
Use the minimum pressure specified by the manufacturer as the test pressure. 6.4.3 Measurement
Measure the spray volume at the beginning of the test and every 1h thereafter or at regular intervals selected according to the nozzle wear rate. Carry out the spray volume distribution test at the beginning and end of the test, and when the spray volume increases by about 10%, 15% and 20% (see 6.3). 6.4.4 Results
The measured spray volume increase value is expressed as its percentage of the initial spray volume. The spray volume distribution values of nozzles with different degrees of wear measured in 6.4.3 are expressed in the graph and table in 6.3.5 and recorded in the test report. 6.5 Determination of the spray angle of hydraulic nozzles
The spray angle is determined by photography or calculation, that is, the angle formed by the outer edge of the jet at the top of the jet. The obvious streamline segment of the outer edge of the jet is used as the reference. The measurement principle is shown in Figure 6.
Figure 6 Schematic diagram of spray angle determination
6.6 Determination of droplet size of hydraulic nozzle
Droplet size is determined by oil pan method or magnesium oxide method, or by laser particle spectrometer. 6.6.1 Test liquid
Use liquid that meets the requirements of 3.1 or 3.3. 6.6.2 Pressure
At least the following pressures shall be used:
The maximum pressure and minimum pressure specified by the sprayer or nozzle manufacturer; a.
b. The best pressure recommended by the sprayer or nozzle manufacturer. 6.6.3 Sampling method
Sampling can be carried out by moving the nozzle (such as working on a spray test vehicle) or the cover plate. It should be able to collect enough droplets without causing the droplets to merge with each other. The maximum horizontal moving speed is 3m/s. 6.6.4 Droplet quantity and size classification range
Collect enough droplets. If sampling is performed at 5 points (conical mist flow or flat mist flow), the total number shall not be less than 2G00; if sampling is performed in a chessboard pattern (cylindrical mist flow, conical mist flow horizontal injection), the total number shall not be less than 10,000. Make representative samples. The size classification range shall be selected according to the size of the collected droplets. It can be classified according to the minimum resolution size of the micrometer or according to natural numbers, but it should not exceed 100μm.
6.6.5 Test devices and instruments
Several microscope slides (25mm×75mm) fumigated with magnesium oxide powder or punching plates with 2~3mm thick No. 10 engine oil. Several rod-shaped objects or combined spray tanks 0.5m above the ground. Laser particle spectrometer or microscope.
6.6.6 Determination
Fix several microscope slides (25mm×75mm) or oil pans fumigated with magnesium oxide powder horizontally on several rods, 0.5m above the ground, so that the long sides of the slides (or oil pans) are arranged in a row, and are placed equidistantly on the entire width of the recruitment belt, perpendicular to the forward direction of the nozzle. The vertical distance between the nozzle and the fog collecting surface is the value specified by the manufacturer or selected by sampling. This vertical distance is recorded in the test report. Size classification should be carried out in several rectangles of equal size along the same axis of each slide, and the measurement length is not less than 50mm. Take the microscope measurement method as an example. The nozzle moves above a row of sampling dishes or slides, or moves with a cover plate above the sampling dishes or slides, and each sampling blood or slide collects part of the droplets of the fog flow. Under the microscope, all droplets within the field of view and the area under the movement should be measured and recorded according to size classification. Calculate the total volume of droplets collected and the distribution of the droplets expressed as the percentage of each size class. 6.6.7 Results
Draw a droplet distribution curve on Gaussian logarithmic curve coordinate paper. The cumulative volume value is indicated on the X-axis (Gaussian scale) and the droplet diameter is indicated on the Y-axis (logarithmic scale).
In particular, the values of the diameters corresponding to 16%, 50% (volume median diameter) and 84% of the cumulative volume should be indicated. 7 Method for determining the characteristics of pneumatic nozzles
The general test conditions shall comply with the provisions of Article 5. For pneumatic nozzles, the tests in Articles 7.2 to 7.6 shall use nozzles with a spray volume closest to the average value in the test in Article 7.1.
7.1 Consistency of spray volume of pneumatic nozzles and its spray volume measurement 7.1.1 Sampling
Randomly select 5 nozzles of the same model, record the sampling conditions, especially the inventory and sampling location, in the test report, and attach a complete machine. ·
All the markings of the nozzles and nozzles should be recorded in the test report. 7.1.2 Test liquid
The test liquid shall be in accordance with the provisions of Article 3.1.
7.1.3 Measurement
Each nozzle is under the best working conditions specified by the manufacturer, the liquid tank is filled with water, and the liquid regulating device is set to the maximum opening (or other different openings) at the specified working pressure, and the spray volume changes during the entire spray time are measured. The measurement points should include 5 to 7 o'clock including the start and end time (the end time refers to the time when normal continuous spraying cannot be carried out). During the test, the nozzle is placed horizontally and vertically respectively, and repeated three times. The liquid level sensor or table operation is used, and the standard deviation and coefficient of variation of the average spray volume are calculated and recorded in the test report. 7.2 Determination of the distribution of the spray volume of the pneumatic nozzle
The test is carried out indoors, and the nozzle is placed horizontally and at the center line of the slot, with its center 1000mm or 500mm above the slot surface. 7.2.1 Test liquid
The test liquid is in accordance with the provisions of Article 3.1.
7.2.2 Regulating valve
The test should be carried out under the various gears of the regulating valve provided by the manufacturer. 7.2.3 Nozzle device
During the test, the nozzle should be placed vertically above the top of the first slot wall of the combined spray slot in its normal horizontal working state, and placed at the 6
center line position on the slot, with the longest side of the mist shape at right angles to each mist collecting slot. 7.2.4 Determination
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On the premise of wetting the spray slot in advance, the whole tank of water in the liquid medicine tank is sprayed and measured, and the mist volume of each slot is recorded. 7.2.5 Results
The distribution of the amount of spray shall be expressed as a curve (it is recommended that 50 mm on the Y axis represent 100%; on the X axis, each 10 mm represents 1 m) or a table, as the percentage of the amount of liquid collected in each slot to the average amount of liquid in all slots. 7.3 Determination of droplet size of pneumatic nozzles
7.3.1 Test liquid
Use a liquid that meets the requirements of 3.1 or 3.3. 7.3.2 Working conditions
The test shall be carried out under the optimum working conditions recommended or specified by the sprayer manufacturer. 7.3.3 Spray head movement speed
When moving the spray head, the horizontal speed and height selected shall be used to collect enough droplets without causing the droplets to merge. The general spray head movement speed is set at 3 m/s, and its height is selected as 500, 800, and 1.000 mm, and recorded in the test report. 7.3.4 Droplet quantity and size classification range
Collect enough droplets, but not less than 2000. The size classification range is selected according to the size of the collected droplets, generally classified by the difference between each grid of the micrometer. 7.3.5 Test devices and instruments
Same as 6.6.5.
7.3.6 Measurement
All droplets with the same area along the spray width and on the area should be measured. Record the size and calculate the total volume of the collected droplets and the distribution of droplets expressed by the percentage of each size class. The measurement method is shown in 6.6.6. 7.3.7 Results
Draw a curve of the amount of fog distribution on the Gaussian logarithmic curve coordinate paper. The cumulative volume value is shown on the X-axis (Gaussian division): the droplet diameter is shown on the Y-axis (logarithmic division).
8 Test report
The test report format is shown in Appendix A (reference). A1 Test report format (content can be selected or deleted as appropriate) A1.1 Description of the tested nozzle
Complete mark:
Manufacturer name
Nozzle model
Dimensions (sample reference)
Manufacture date
A1.2 Test results of nozzle characteristics
JB5116—91
Appendix A
Test report format for sprayer nozzle
(reference)
Note: For the tests of A1.2.1 to A1.2.6, the pressure remains stable and the deviation is within 2.5%. A1.2.1 Consistency of spray volume
Temperature and relative humidity:bZxz.net
Test liquid temperature
Temperature of surrounding air
Relative humidity of air
A1.2.1.1 Sampling of test nozzles
Randomly select 20 nozzles from a batch (n) of nozzles for testing. Sampling location
Sampling date
A1.2.1.2 Test liquid
Clean water without suspended solids.
A1.2.1.3 Determination
The pressure used is the maximum working pressure, that is, the difference is less than 15.
Spray duration
s (≥60 s).
MPa, the measurement error of the spray volume is less than 1%, and the measurement error of the spray time is less than A1.2.1.4. Graph (see Figure A1) and record table (see Table A1) of the nozzle spray volume test results (expressed as a percentage of the average spray volume of all nozzles). Nozzle spray volume (% of average spray volume)
Nozzle number
Spray volume L/min
(% of average spray volume)
A1.2.2 Spray volume at different pressures
Temperature and relative humidity:
Test liquid temperature
Ambient air temperature
Relative humidity of air
A1.2.2.1 Test liquid
Clean water without suspended solids.
A1.2.2.2 Pressure
Maximum pressure specified by the manufacturer
Minimum pressure specified by the manufacturer
Intermediate pressure
A1.2.2.3 Determination of spray volume under different pressures The spray volume of the nozzle closest to the average value (test of Article A1.2.1) is tested with the selected nozzle No.
JB5116—91
MPa.
. A1.2.2.4 Results of the spray test at different pressures (see Figure A2 and Table A2) Spray volume
(L/min)
Pressure MPa
Spray volume L/min
A1.2.3 Spray volume distribution
Temperature and relative humidity:
Test liquid temperature
Temperature of surrounding air
Relative humidity of air
A1.2.3.1 Test liquid
Clean water without suspended solids.
A1.2.3.2 Pressure
Maximum pressure specified by the manufacturer
Minimum pressure specified by the manufacturer
MPa.
(MPa》
A1.2.3.3 Nozzle position
Optimal height specified by the manufacturer
A1.2.3.4 Determination of mist distribution
JB5116-91
When the amount of liquid collected by a measuring tube reaches 90% of the capacity of the measuring tube, stop collecting liquid. A1.2.3.5 Determination results of the amount of liquid distribution
Graph (see Figure A3)||tt ||Reduction (% of average spray volume)
Center line of nozzle
Position (see Table A3)
Ye Hai m
Table A3Position of mist collecting trough relative to the center line of nozzleRight
50~100
100~150
500~550
550600
Volume (% of average value)
A1.2.4 Due Changes in the distribution of mist due to nozzle wear or corrosion Note: This test is carried out on 5 nozzles.
Temperature and relative humidity:
Temperature of test liquid
Temperature of surrounding air
Relative humidity of air
A1.2.4.1 Test liquid
50~100
100~150
500550
550600
A1.2.4.1.1 Clean water, with an abrasive or corrosive agent with the following characteristics added to each liter of water: Name
Average size of particles
Volume (% of average value)
During the test, the temperature of the liquid should be maintained within the range of 20±3°C, and the concentration of the test liquid in the liquid tank should remain unchanged during the test. A1.2.4.1.2 Method used
Volume of liquid placed in the tank at the beginning of the test 10
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