DE1531786A1 - Method and device for conveying powdery substances in pipes - Google Patents

Description

Method and device for conveying powdery substances in tubes »

The invention relates to a method and a device for conveying powdery substances in Pipes and affects such actions on the formation a suspension of the powdery substance in a gas are based. Gas mixtures are also regarded as gas, ZoB. Air, hereinafter referred to as the gas is used.

A particular application of the invention relates to the application of powdery coating material Objects «. A feature of the invention is the development of a particularly effective method and one corresponding device for feeding the powdery Coating material that is in air in a handheld device., For electro static powder application is suspended.

In one aspect the invention resides in a method for conveying powdery substances, in which a suspension of the powder in a line for supplying Compressed air is formed by means of a nozzle which protrudes into the end of a line and at least one Part of the line in the vicinity of the nozzle end is arranged essentially vertically and set in vibration will.

In another aspect, the invention resides in one Device for conveying powdery material with

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a container for this material, with a pipe that extends from top to bottom in this container with a nozzle, which protrudes somewhat into the end of the line in the container, with a device for supplying compressed air to the nozzle and with means for vibrating the end of the conduit and optionally also the nozzle.

In a further aspect the invention resides in a method of applying powdery coating material on an object, creating a powder-air suspension in a conduit by supplying compressed air through a nozzle and at least a portion of the conduit is substantially vertical near one end and in Vibrations. After that, the suspended powder passed through the line to a manifold head, with a electrostatic field is maintained between the head or part of the head and the object. The one with The object to be coated with powder lies in such a way that the powder emerging from the head is drawn onto the object.

Preferably the lower end of the line vibrates along its Armpit and is arranged so that it is substantially vertical ends above a vibrating plate that forms the bottom surface of the powder container. The vibration of the plate can be electromagnetic or pneumatically ^ and lies preferably in the sounding! frequency range «,

The top of the nozzle is roughly in the same plane as the lower end of the tube, but can also protrude a short distance into the tube. Usually the nozzle and the tube is equiaxed, the cross-sectional area of the lower end of the tube, for example, at least thirty times the cross-sectional area the nozzle is. The inner surface of the tube is preferably designed like a venturi tube. The air can do it Nozzle, for example, with a pressure of 3.5 at, the cross-sectional ratio of the line and the nozzle can be dimensioned so that the pressure in the line is about 0.07 at.

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It is understandable that the nozzle supplied and in compressed air entering the pipe creates a negative pressure zone at the Muzzle of the pipe and in its vicinity causes. the Titration of the plate on which the tube is attached calls partial flowability of the powder in this zone, so that the negative pressure pulls the powder into the tube and mixes it with the air emerging from the nozzle. The air and the powder that has been carried along pass through a line to a distributor head or other utilization device.

An embodiment of the device is to be used below with reference to of the drawing * In this is:

Fig. 1 is a vertical section through the device with the powder container and the vibrator, wherein the air supply lines are omitted,

! Fig. 2 shows a plan view of the vibrating floor. Fig. T after the powder container has been removed is,

S ¹ Ig. 3 shows a plan view of the lower part of the device in the direction of plane y-y in FIG. 1 after the vibrator has been removed, and FIG

4 shows a plan view of the upper part of the vibrator, di0 the arrangement of the supply pipes to the Vibrator shows after the membrane is removed.

The device according to Fig. Λ consists of a funnel-shaped powder container Λ and a vibrator housing 2, which is attached to the base of the funnel 1 by screw bolts 3 and '

Nuts 4 is attached, with an annular seal 5 lies between the funnel T and the vibrator housing 2. The housing of the vibrator consists of an upper cylinder and a lower cylinder 7 Eiit a bottom plate 8, the are connected to each other by 5 screws 9 (Fig. 2). , The upper and lower cylinders are made of solid plastic, while the base has the shape of a metal bowl « A thin membrane 10 made of resilient material is between the upper cylinder 6 and the lower cylinder 7 clamped.

A pipe section 11 made of metal lies above the membrane 10 a sewing cap 12 at its end and with a deform-

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"cash metal insert 13 for attaching the lower end of a Äustrxttsleitung 14 · The Eohrstück 11 is supported by. a spider Vj with three legs, which is welded to the sentimental, .wobei each leg is provided at its free end with a support ring 16» On Three pins 17 are attached to the membrane 10 with flat nuts; they pass through the support rings 16 at the ends of the legs, the spider 15 being held at a certain distance from the membrane by spacer sleeves 19 _o the hinge at the ends of two legs of the spider are freely movable and can move on their pins, whereas the third sing on its pin is fixed by a ψ nut 20.

In the middle of the membrane 10 a nozzle tube 21 is arranged, the lower end of which is provided with a thread, on the above the diaphragm 10 a flat nut and under the diaphragm a solid disk-shaped body 23 is screwed on are. On the lower surface of the solid body 23 is a Recessed cavity 24. In the body 23 are two radial Holes drilled (see Fig. 4), one of which has a passage 25 that forms part of the lower part of the nozzle tube 21 and the other forms a passage 26 which terminates with an opening 27 in cavity 24. In the part 23 are Connections 28 and 29 screwed in with the diameter 25 and 26 are connected »

The lower limit of the cavity 24 is formed by the surface of a second solid body 30 which is pressed against the hand of the body 23 by a spring 31 which, with its upper end around a pin 32 of the body 30 and with its lower end in a recess 33 of the base plate 8 engages. The body $ 0 is movable with respect to the body 23, the two being held against one another by a plug connection 34 which is fixed in the body 30 and can slide in a bore in the central pin 35 of the body 23 _{or the like}

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As Fig. 3 shows, the base plate 8 is with two connections 36 and 37 which are connected to the connections 28 and 29 by rubber hoses 38 and 39 (see FIG. 4). So the connection 36 forms an air supply to the nozzle tube 21 and the connection 37 an air supply to the cavity

When using the device, the Trisiiter 1 is filled with powder and the outer end of the line 14 is provided with the use device. This utilization means may be 'in particular a hand-held device for spraying powder according to a previous "proposal of the applicant (A 56693 / LFC 75a). At the two terminals 36 and 37 are compressed air lines is connected with the effect that the membrane g is vibrated 10 and the air supplied through the nozzle 21 entrains the powder which is set in motion by the vibration of the membrane 10. The air directs the powder through the pipe 11 into the connecting line 14 to the use device 11 is designed as a Venturi tube and thus supports the removal of the powder by the air emerging from the nozzle 2-1

The air line connected to port 37 calls an air pressure in the cavity 24 emerges, which after a provided time is sufficient to the two bodies 23 and 30 ge.;, en the effect of the membrane 10 and the spring 31 to stand out from each other. The air then escapes at the Um- ™

catch the cavity and emerge from the vibrator housing the holes 40 in the recess 33 (see Fig. 1). As a result of the pressure drop in the cavity 24, the bodies 23 and 30 brought together again by the spring 31 and the diaphragm 10. This process repeats itself periodically and causes the membrane 10 to vibrate. The vibration is applied to the pipe 11, to the nozzle 21 and to the access of the powder transferred into the funnel 1, so that the powder is in a more or less flowable state is held. The air supplied through the nozzle calls a negative pressure zone protrudes from under the end of the pipe 11,

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while the vibrations bring about an uninterrupted flow of the easily agitated powder in this zone, from which the powder is drawn into the Eohr 11. The line 14 is loosely fitted to the upper part of the Hopper 1 held so that the vibrations are also Extend over a substantial part of the pipe and prevent blockages in the pipe

Instead of the pneumatic vibration device on the Diaphragm 10 can also be provided with an electromagnetic device, the bodies 23 and 30 by the magnetic core of a solenoid coil to be replaced, the frequency corresponding to an alternating current. is excited »

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Claims (1)

Claims. y 1 · "Process for conveying powdery substances in a pipe characterized by supplying compressed air, that in thorn i'ulverb he keeps (1) protruding End of the tube (11) and this bypassing powder in Vibrations are displaced, through which the powder protrudes into the pipe end under the suction effect of a Air nozzle (21) is conveyed as a suspension into the pipe (11) 2. The method according to claim 1, characterized in that the pipe end (11) vibrates in its axial direction. | 3ο method according to claim 1 or § characterized in that that the number of oscillations of the vibrator is in the tone range. 4, device for practicing the method according to claims 1-3 with a funnel-shaped container for the powder characterized by a circular i-membrane (10) which forms the bottom of the container (1) and is under the action of a vibrator, in its center outlet nozzle (21) for compressed air and keeps these on the exhaust pipe (11) for the air-powder suspension, for example ₀ by a spider (15). " 5ο device according to claim 4, characterized in that the pipe end (11) over the membrane (10) essentially f is arranged upright. 6. Apparatus according to claim 4 and 5, characterized in that that the circular membrane (10) on its periphery clamped in the housing of the device and. in their midst connected to the vibrator. 7 · Device according to spoke 4-6, characterized in that the cross-sectional area of the pipe end is at least thirty times the cross-sectional area of the nozzle. Device according to claim 4-7 characterized by a pneumatic vibrator consisting of one under the - 8 909839/06 2 5 BATH Membrane (10) attached disc-shaped body (23) with a downwardly open cavity (24 ·), which is connected to the compressed air supply by two flexible lines (38, 39) is connected, of which the line (39 »26,27) opens into the cavity (24) and the line (38,25) leads to the air nozzle (21), as well as from a resiliently arranged body (3d) which is opposite the body (23) covers the cavity (24). 9. Apparatus according to claim 4-7 characterized by an electromagnetic vibrator, which consists of a magnetic core in a coil, which acts on the membrane (10) 10. Apparatus according to claim 4-9 characterized by the connection of the pipe end (1 ^) to a distributor head, through which the powder-air suspension is applied to an object, with between the distributor head and the object is exposed to an electrostatic field that guides the suspended powder onto the object » Patent attorneys Rpl.-lng.W.iNAeisener U. H. Tischer OFtIGtNAL 909839/0625 - 9- blank page