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1、 Main uses of the product:

The Military standard sand and dust testing machine is suitable for conducting experiments on mechanical and electrical equipment, seals, and other products to prevent sand and dust from entering the casing in a sand and dust environment. To test the performance of the test sample in the use, storage, and transportation of sand and dust environments. This device meets the relevant national standards and shell protection levels.

2、 Main technical features:

1.1 Effective volume: 2197 liters

1.2 Effective internal dimensions: 1300 × 1300 × 1300mm (width × depth × height)

1.3 Section size of air duct: 1300 × 1300mm (width × height)

1.4 External dimensions of the box: 7800 × 5300 × 2500mm (width × depth × height)

1.5 Structure: Horizontal type

1.6 Wind speed: adjustable between 1.2m/s and 8.9m/s, and between 18m/s and 30m/s.

1.7 Temperature range: adjustable from room temperature to+80 ℃

1.8 Relative humidity range: ≤ 22%RH

1.9 Dust blowing experiment:

1.9.1 Dust blowing air velocity: 1.2m/s to 8.9m/s

1.9.2 Dust blowing concentration: 0.1g~100.6 ± 7g/m3 (sand particle diameter ≤ 149um); (including sand and dust concentration sensor)

1.9.3 Composition of Sand and Dust (Small particles in the experiment can be composed of any combination of the following components by weight):

Use common red porcelain clay or widely used quartz powder. Among them, quartz powder contains 97-99% (by weight), and the main components of red porcelain clay include:

Calcium carbonate, magnesium carbonate, magnesium oxide, titanium dioxide, etc. 5%

Iron oxide (Fe2O3) 10 ± 5%

Aluminum oxide (alumina) 20 ± 5%

The other components are silicon dioxide.

1.10 Sand blowing experiment

1.10.1 Wind speed 0.1-30m/s; Interval adjustable

1.10.2 Sand blowing concentration: 1.1g/m3 ± 0.25/m3 to 100g/m3 ± 0.5/m3; 100g/m3/d (including sand and dust concentration sensor)

1.10.3 Sand and dust composition: If there are no other specific regulations, quartz sand (with silica content above 95% specific gravity) is used for large sand particles.

1.10.4 Sand particle diameter: 150um ≤ sand particle diameter ≤ 850um;

1.11 Collection System: The system can automatically collect falling sand particles and enter the box for further circulation.

1.12 Box sealing: There is no dust leakage during operation, which can effectively protect the surrounding environment from pollution.

1.13 Noise:<70 dB (A) measured 10m in front

1.14 Inner liner material: AISI304 stainless steel

The outer body is sprayed with RAL7047 gray white and decorated with RAL5015 blue.

1.16 Box door: Fully open single wing type (1300 × 1300mm), with double-layer silicone rubber seal and door lock.

1.17 Observation window (400 × 600mm) with heating protective film.

1.18 Automatic vacuum cleaning system.

1.19 Wind speed simulation system: Strong winds are generated by high-power centrifugal fans, and the wind speed is automatically adjusted by a frequency converter.

The 1.20 rotary table (diameter 800mm) rotates counterclockwise at a rate of 1 revolution per minute, providing some slots to secure the specimen. The motor shaft of the rotary table is sealed with an O-ring.

The 1.21 collector (funnel-shaped) is located at the lower part of the testing space.

The 1.22 air compressor controls the switch and air purification through the pneumatic valve on the machine.

1.23 50 kg sand can operate normally for 5 years

1.24 Equipment weight: approximately 3000Kg

1.25 Box control functions: temperature in Celsius, relative humidity, wind speed in meters per second, sand density in grams per cubic meter

2. Configuration Description

2.1 The upper computer control system includes: one Dell computer (mainstream market configuration), as well as RS232 serial port and other configurations.

2.2 The control functions of the upper computer include:

The rise and fall of each program curve and its maintenance

Store test data on a USB drive

Experimental process display

Programming experiment monitoring

Practical print settings

Preset alarm conditions

Start the experiment at a scheduled time

Vibration test switch

2.3 HP Laser Printer

2.4 Sand meter

2.5 Automatic feedback control: Wind speed automatic feedback control regulation. There are two anemometers inside the box, one is a "hot wire" type and the other is a "rotating" type. Ultrasonic wind speed and direction sensors measure horizontal wind speed and direction through ultrasound. The measurement is based on ultrasound transmission time, and the transmission time of ultrasound from one probe to another depends on the wind speed. The transmission time is measured in two directions of a pair of probes. Take two measurements from each position of the three ultrasonic paths at a 60 ° angle to each other, and calculate the wind speed and direction. The calculation method of wind measurement values can completely eliminate the influence of installation height, temperature, and humidity. The accuracy of the anemometer can reach 0.5m/s.

3、 Security protection measures:

3.1 Safe and reliable grounding protection device;

3.2 Power undervoltage, leakage and phase loss protection;

3.3 Independent studio overheating protection;

3.4 Compressor overload protection;

3.5 Heater short circuit/overload protection;

3.6 Overload protection for blower motor;

3.7 The system detects the activation of a protective device, which automatically shuts down and displays an alarm.

4、 Usage conditions:

4.1 Venue: The ground is flat and well ventilated. There is no strong vibration or electromagnetic field around the equipment. There are no flammable, explosive, corrosive substances or dust around the equipment. Ground bearing capacity: not less than 800kg/㎡. Reserve approximately 1500mm of operation and maintenance space around the equipment.

4.2 Working environment: Temperature: 5 ℃~35 ℃; Relative humidity: ≤ 85%; Air pressure: 86kPa~106kPa;

4.3 Power supply conditions: Installation power: 125kW, equipped with independent air circuit breakers; Supply voltage: 380 V ± 10%/50Hz/3ph+N+G; Grounding resistance: ≤ 4 Ω.

4.4 Circulating cooling water: pressure 2-4 bar, temperature ≤ 30 ℃, flow rate ≥ 10m&sup3/ h。

4.5 Compressed air: pressure 6-8 bar, dew point ≤ -10 ℃, flow rate ≥ 40m&sup3/ h。

5、 Technical data and attachments provided:

5.1 Technical Data: Product Qualification Certificate, Factory Inspection Report, User Manual, Electrical Schematic Diagram, Refrigeration System Diagram, etc.

5.2 Attachment: One set of vulnerable parts (including 2 PT100 platinum resistors)

6. The product meets the experimental methods: IEC 60068-2-68 and MIL-STD-810G method 510.5