FR2820995A1 - Industrial extraction and measurement of pollution from fabricating mechanical items or assemblies comprises use of device containing extraction hood, dust-controlled working area and filter membrane - Google Patents

Abstract

A device has three modules: a vertical non-recycling laminar flow extraction hood (a1); a dust-controlled working area (a2) with solvent distribution and recovery, and a filter membrane (b1) with means of evacuation (b2) including or not a particle counter. A manipulating arm (c) to facilitate production and manipulation of large items in the working area can complete the modules : Each module cannot be separated from the assembly. The solvent is completely clean (filtered) and can be recovered and reused after filtration. An air intake ensures evacuation of air from the working area (taking all the solvent vapors and ensuring the safety of the operator).

Description

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.. microscopique. DESCRIPTION The present invention relates to an industrial measurement means allowing both a-to extract by inertial impact the pollution of manufacture of a part or a set of mechanical part (s) in a dust-controlled environment and, b -to quantify the pollution extracted in a-using different standardized analytical methods, namely automatic particle counting, gravimetry or counting

.. microscopic.

Whatever the place of its realization (laboratory or mechanical workshop), the measurement of the pollution of manufacturing of the parts requires a lot of handling of fluid and glassware, handling generally very unfavorable to the precision, to the repeatability and to the reproducibility measurements. These manipulations also prove to be very time consuming.

The invention presented below, incorporating a device for extracting and measuring manufacturing pollution, makes it possible to remedy these problems of representativeness of the measurement results while allowing their industrialization (no manipulation of glassware required, simple operating procedure and consuming little time). a-Extraction of manufacturing pollution
A filtered and pressurized solvent distributor is available under a laminar flow hood.

 The useful enclosure, where the room rinsing operation is carried out, consists of 3 vertical walls and a slab, access to the enclosure being free (a protective glass protects the operator against projections solvent).

 The Operator directs the solvent jet towards the surfaces of the part (s) to be characterized from the point of view of manufacturing pollution (as a general rule, these are perfectly identified surfaces, such as for example so-called wet surfaces, c '' that is to say in contact with the industrial fluid: groove of a bearing, inside of a pump body, ...).

 The solid particles are then detached from the part by inertial impact and the solvent loaded with particles recovered in the raft.

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b-Quantification of pollution
The solvent available in the raft is filtered through a membrane by simple vacuum and is automatically transferred to the recovery tank.

 A system for venting the suction line allows the vacuum to be broken to remove the membrane from its support.

 The amount of pollution thus collected on the membrane is determined either by gravimetry (carried out according to ISO 4405), or by counting under a microscope (carried out according to ISO 4407).

 A variant of this device is the online installation of an automatic particle counting system between the raft and the filter membrane.

 The diagram appended in FIG. 1 represents the device of the invention.

a-L/JEraction de la pollution defabrication 0 Hotte à flux laminaire et Enceinte de travail (al) - Hotte à flux laminaire vertical, non recyclé présentant 2 positions (position de veille et de travail). With reference to this diagram, the device comprises for:

aL / JEraction of pollution from manufacturing 0 Laminar flow hood and working enclosure (al) - Vertical laminar flow hood, non-recycled with 2 positions (standby and working position).

supérieure. - Class 4000 dust-controlled working enclosure according to AFNOR standard
NF X 44101 comprising 3 vertical panels and a Polymiroir stainless steel base. Over the entire front width, an air intake ensures the evacuation of air from the part

higher.

0 Solvent distribution and recovery (al) - Solvent distributor: spray gun fitted with interchangeable nozzles with LCF * * Last Chance Filter (Indicative filtration threshold: 3 µm absolute). - Pressurized tank under compressed air (Indicative: from 2 to 4 bars) with pollution control filter (Indicative filtration efficiency: @ 1> 1000).

- Solvent recovery tank maintained under vacuum (Indication: -0.4 bar). h-Quantification of pollution 0 Membrane with s Wor (bl) - Stainless steel membrane support with diffuser (diverging).

- U 47mm cellulose acetate filter membrane (DMPindlcatif *: 5 um) * DMP: Average Pore Diameter

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0 Dispositif de mise au vide (M) - Pompe à vide.

0 Vacuum device (M) - Vacuum pump.

- Ventilation valve

Claims (4)

 1-Device for extracting and industrially measuring pollution from the production of parts or a set of mechanical parts, composed of 3 modules: 'a laminar flow hood of non-recycled vertical type (al),' a dust-controlled work chamber with distribution and solvent recovery (a2), a filter membrane (b1) with a vacuum system (b2) incorporating or not an automatic particle counter.  A manipulator arm (c) facilitating the gripping of large parts and their manipulation in the working enclosure can complete these 3 modules. 2-Device according to claim 1-characterized in that each of the 3 modules is indivisible from the assembly. 3-Device according to claim 1-or claim 2-characterized in that the solvent distributed is completely clean (filtered) and in that the solvent used can be recovered and reused after filtration. 4-Device according to any one of the preceding claims, characterized in that an air intake ensures the evacuation of the air from the working enclosure (recovery of all vapors

 solvent Q Operator safety).