Application of liquid particle counter in cleanliness detection of automobile parts
Application of liquid particle counter in cleanliness detection of automobile parts
The cleanliness detection of auto parts is a key quality control link in the process of auto manufacturing. The main purpose is to ensure that the surface and interior of parts are free of pollutants (such as metal chips, dust, oil, fiber, etc.) to avoid the failure of parts or affect the performance of the whole vehicle due to impurities.
According to the national standard GB/T 41481-2022 Road Vehicles: Cleanliness of Parts and Systems, there are three methods for testing the cleanliness of auto parts: standard analysis, in-depth analysis, and simplified analysis. The use of liquid particle counter for testing the cleanliness of auto parts belongs to the simplified analysis.
Note: Simplified analysis refers to an analytical technique that requires particle extraction but does not require filtration. Simplified analysis can obtain analytical results faster, that is, more parts can be tested in the same time.
liquid extraction
To test the cleanliness of auto parts, the first step is to extract particles. There are two ways to extract particles, liquid extraction and air extraction. The simplified analysis mainly involves liquid extraction.
Liquid extract particles can be extracted by four different methods, spray wash, ultrasonic vibration, internal cleaning and shaking. This paper takes internal cleaning as an example to introduce it in detail.
Internal cleaning refers to the process of removing particles from the inner surfaces of test components through liquid immersion. The internal surfaces of the test components are completely or nearly completely filled with the test liquid. To ensure effective particle separation, the test liquid flow inside the components should be turbulent rather than laminar. The use of pulsed flow effectively separates particles.
Therefore, internal cleaning, as a kind of particle separation method, is suitable for automotive parts supporting liquid flow, such as:
--Passive components, such as pipes, hoses, conduits, filters and heat exchangers;
--Active components that need to be opened when filling liquid, such as valves or injectors, and even active components that need to be driven, such as pumps.
Note: Examples of the applicability of liquid extraction methods for different component characteristics
|
Extraction Method |
Component Characteristics |
Examples |
|
Spray Washing or Ultrasonic Vibration |
Small components, with sizes from several millimeters to several centimeters, difficult to handle individually, inspected as bulk parts (fully controlled surfaces) |
Ball bearings, gaskets, bolts, springs, "O"-rings, etc. |
|
Spray Washing |
Small to large components, from several centimeters to 1 meter in length (fully controlled surfaces) |
Connecting rods, pistons, gears, parts of camshaft housings, etc. |
|
Internal Cleaning |
Components with regions of good flow characteristics, where the cross-section of connectors and internal cross-sections range from several millimeters to several centimeters (inner surfaces) |
Pipelines, pipes, filter housings, heat exchangers, etc. |
|
Spray Washing or Internal Cleaning |
Components with inner surfaces featuring connector cross-sections and internal cross-sections within a few centimeters, accessible by internal cleaning or spray guns |
Hydraulic valve groups, pipe or hose joints, turbocharger housings, oil rails, etc. |
|
Spray Washing and Internal Cleaning |
Components with partitioned functional areas, where outer surfaces use spray washing and inner surfaces use internal cleaning methods, with the two areas filtered onto different analytical filter membranes respectively |
Engine blocks, crankshafts, etc. |
|
Agitation |
Components with simple inner surface geometries, no narrow cross-sections, and only a few easily sealable openings (manual operation limitations: component and test fluid mass) |
Compressed air tanks, coolant reservoirs, etc. |
|
Agitation or Internal Cleaning |
Components with inner surfaces of good flow performance and only a few easily sealable openings (hole cross-sections and internal cross-sections within a relatively low centimeter range) |
Pipes, simple heat exchangers (with not too narrow cross-sections), etc. |
|
Agitation or Spray Washing |
Components with simple inner surface geometries, no narrow cross-sections, and only a few easily sealable openings and large cross-sectional holes |
Fuel tanks, short pipes, thick pipes, etc. |
BT8200 liquid particle counter
Liquid particle counters can be used to classify the size and number of particles in a liquid. The device can detect particles directly in the liquid and is very easy to use.
The BT8200 liquid particle counter uses the photoresist measurement principle to detect the size and quantity of particles in the liquid from 2 to 750 microns. The instrument is reliable and easy to use, with multiple particle size detection channels to meet the diverse needs of users.
Currently, the BT8200 liquid particle counter has been widely used in cleanliness testing in the electronics, heat dissipation, and precision manufacturing industries.
Note: The liquid particle counter is suitable for verifying cleanliness specifications in automotive parts cleaning, but not for process optimization, and is very suitable for process monitoring.
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