DE2303055A1 - FACILITY FOR SURFACE TREATMENT - Google Patents

Description

Facility for surface treatment

The invention relates to a device for treating the surface of objects by means of one of a Nozzle exiting air jet, which is a surface treatment agent is enclosed, with cabin, suction device and a dust filter for cleaning the polluted air escaping from the cabin.

The device according to the invention is characterized by this from the fact that the dust filter is preceded by selective separating elements that allow dust and air to pass through, but at least the greater part of the particles

309849/0791

of the surface treatment agent, and the are arranged and designed so that the reusable particles they hold back through Gravity falling into a collecting container.

It finds new furnishings especially in the cabins Application in which the surface of the objects used is refined and not in rough work like cleaning castings by sandblasting, whereby it does not depend on the initial or nominal grain size. Under A surface refinement is a targeted treatment, for example with abrasives to understand the have the smallest possible scatter in the grain size. This means that, for example, a precisely maintained surface roughness can be achieved can be achieved, which alone the stability of e.g. cutting and punching tools increased many times, because the smear layer now adheres to the surface. Also galvanic coatings adhere better to a specifically pretreated surface. Polishing agents can also be added to the air jet or agents that cause surface densification * The latter is the so-called "Shot-Pe" ening "method.

If you want to carry out a precisely controlled surface treatment, it is important that the small ones

309849/0791

Particles of the surface treatment agent always have the same size. Their effectiveness is based on the kinetic energy given to them by the air jet. During surface treatment, they hit the surface to be treated at high speed and partially break or crumble in the process. This changes the grain size of the mass. It is therefore important to have that too
small ineffective particles not to be reused. It would therefore be conceivable to use the particles only once and then suck them off together with the air. But this is uneconomical because the used
Hittel in the desired grain size is relatively expensive
are. For example, electrical corundum costs with one
commercial nominal particle size of 320 (according to DIN standard or VSM) about Fr. 3 per kg versus cabins with a usual suction device without acting selectively separating members is achieved a saving of at least 30 i. ".

The separating organs, which act selectively, therefore offer
two things:

A economic advantage, namely by using less material of the relative
expensive surface treatment agent need to be lost and

■ - 3:

303849/0791

B a technical advance by using the new separator even the width of the after a certain processing time Size spectrum band of the particles is reduced. Contains a treatment agent with nominal grain size 320, for example, particles with an effective grain size between 300 and 400 are obtained after a certain processing time a mass with an effective grain size between 330 and 370 lies.

Exemplary embodiments of the subject matter of the invention are shown in the drawing shown:

Pig, Fig. 1 shows a vertical section through a cabin with an attached suction device;

ijjl * c other possible arrangements of sieve-like Separation devices in a schematic representation, in section;

6 shows a selectively acting separating device in the form of a cyclone in elevation and FIG

7 shows a separation device with lamellae in section.

Fig. 1 shows a cabin for surface treatment in which an object G is added by means of an air jet to which, for example, a fine abrasive,

- 4 309ΒΛ9 / 0791

is treated. The cabin 1 is combined with the suction device 2 to form a unit. In the partition 3 between these two parts selectively acting separator 4 are arranged, which here the shape of a have fine strainer, which is arranged in a frame that is detachable and replaceable in the partition 3 is attached. The booth and the suction device connected to it are on pusses 5 «Die Booth 1- comprises the following parts: a storage grate 6 on which the object G stands and one under the host arranged collecting funnel 7 »in which the abrasive used falls back after its use and accumulates at the bottom of the funnel at A. Halfway up there is a sieve 8 in the funnel 7, in which coarse parts are caught so that they do not mix with the abrasive. From above is that Cabin covered with a hinged cover 9 which is provided with a window 10. When unfolding the lid swivels around hinge 11. There are adjustable controls in the lid and in other suitable places Air inlets 12 attached because during operation the air flow is regulated so that more than is sucked off is blown in, so that there is always a slight negative pressure in the cabin and no dust can escape. The air entering through the air inlet is with

- 5 309849/0791

Advantage along the window 10 so that it remains transparent.

In the Yorderwand there are two airtight. Gloves 13 attached to fixed sleeves 14, with the help of which either the workpiece G or the jet nozzle 15 relative can be moved towards each other. Two hoses 16 and 17, through air and through air, lead to the nozzle 15 Feed loosened abrasive material from supply A to the nozzle.

The most important component of the suction device 2 is a fan 20 _f which sucks air out of the cabin through a battery of dust filters 21 and conveys it to the outside, as the arrows in FIG. 1 indicate. The dust filters are cloth filters that are stretched over stable, air-permeable supports. An electromagnetic shaker 22 is located under the filter battery, which shakes the dust off the filters during breaks in operation. This is collected in the collecting funnel 23 and can get into the dust bag 25 when the flap 24 is open.

In the case of surface treatment, the polluted air from the cabin must first act selectively Enforce separator elements 4. The separation organs shown in Fig. 1 have the shape of a mesh

- 6 309849/0791

sieves, the mesh size of which is chosen so that it Dust and air let through, the somewhat larger ones again usable particles of the abrasive, on the other hand,

separates, as indicated schematically in Fig. 1 at a. These particles trickle through the effect of gravity down from the sieve into the collecting funnel 7. The particles of the abrasive that have crumbled during processing have become so small that they penetrate the separator 4 unhindered and therefore not reusable waste or dust.

FIGS. 2 to 5 show similar separating elements as the mesh screen 4 according to FIG. 1. Their arrangement is but a little different. Because the entry surface of the selectively acting screen is no longer vertical, but is directed obliquely downwards as shown in Fig. 2, 4 and 5, the sieve can suspended particles fall off this more easily. In the arrangement according to FIG. 3, the entry surface is even directed horizontally downwards.

6 shows a separator designed as a cyclone. So that the air throughput is sufficiently large, several such cyclones can be arranged next to one another,

Finally, FIG. 7 shows a separator in form

- 7 -3098Λ9 / 0791

a lamella separator. The polluted air passing through this separator is caused by the shape of the Slats deflected, where the heavier particles carried away by the air hit the slats, where they lose speed and fall off.

In all of FIGS. 2-7, the direction of the air flow is indicated schematically by arrows.

- 8 3098A9 / 0791

Claims (6)

Expectations I.) Device for treating the surface of objects ^/ · · by means of an air jet emerging from a nozzle to which a surface treatment agent has been added Booth, suction device and a dust filter for cleaning the contaminated 'emerging from the booth Air, characterized in that selectively acting separation elements are connected upstream of the dust filter, which let through dust and air but hold back at least the greater part of the particles of the surface treatment agent, and which are arranged and designed in this way are that the particles they hold back fall into a collecting container by gravity. 2. Device according to claim 1, characterized in that the cabin and suction device are combined into one unit are, in which the selectively acting separation elements are arranged in or in front of a partition, the separates the cabin part from the pilot part. 3. Device according to claim 1, characterized in that the selectively acting separating elements are detachable and are arranged interchangeably, so that in each case such on the surface treatment agent being used and whose grain size can be used selectively effective separating elements. - 9 -, 309849/0791 4. Device according to claim 1, characterized in that the selectively acting separation elements as a sieve filter are formed, the mesh size of which is adapted to the grain size of the surface treatment agent. 5. Device according to claim 1, characterized in that that the selectively acting separation elements are formed from deflection lamellae. ■ V 6. Device according to claim 1, characterized in that the selectively acting separation elements as cyclone separators are trained. According to Αυίΐτσα of the foreign Representative urivcp ".-. * · -! .- · t v ^ itorneieitet. - 10 -309849/0791 Lee on the back