DE968508C - Sandblasting machines for cleaning the inner walls of containers, in particular barrels, canisters or the like. - Google Patents

Description

The cleaning and derusting of sheet metal containers, especially barrels, z. B. petrol barrels, oil barrels, Petrol cans or the like with the bunghole on one end of the container a relatively difficult task, which so far has only been solved in an unsatisfactory manner has been. .

One often used chemical cleaning agents for this purpose, their effect through rolling was supported and accelerated by chains inside the barrels. This cleaning method has however, the following disadvantages:

i. It takes a fair amount of time

2. It requires careful adjustment to reliably get a good result the chemical agent used to the very different types of pollution,

3. It is necessary to use the chemical cleaning agent after cleaning to neutralize a counter-reagent in order to avoid corrosion of the inner walls.

In order to avoid these disadvantages, people have already started using smaller petrol cans to clean the inside walls as well as the outside by sandblasting. The sandblasting as nozzle was inserted by hand. Submitted

709 891/3

see from the fact that this method is only feasible for smaller containers, depends on the The quality of its execution depends entirely on the skill and reliability of the executor away.

It is true that barrel jackets have already been mechanically used to create a metallically pure surface To get cleaned by sandblasting before painting. The barrel coats were in one ίο closed sanding room attached to a rotating horizontal plate washer and the sand blasting nozzles on the inside and outside of the barrel jacket always at an even distance and passed with a constant angle of inclination. A was used as the jet nozzle Nozzle fork, which carried the inner and outer nozzles, with the up and down movement of the respective The height of the barrel jacket to be cleaned could be adjusted and accordingly selfao actively switched.

This for a very specific purpose, namely only to clean the barrel jacket in the train the new creation of barrels, applied cleaning method by means of sandblasting fulfills their Task only within the narrow framework on which it is based; however, she would not care for cleaning the inside of barrels and containers that are already in use or the like., for which this method in itself was not intended; are suitable, once because in this way only the wall of the barrel jacket would be cleaned completely inadequately, if 'this method for such purposes would be used, on the other hand it would be - for such barrels, for example which does not use one whole face as a filling and emptying opening, but only one in one the bunghole provided for the end walls · - · not feasible.

In the case of sandblasting machines for workpieces, the difference is the workpiece container one at the end of essentially closed containers revolving around a horizontal axis an inclined shaft revolving, upwardly open drum used, in which over the whole A circumferential sandblasting nozzle protrudes into the end face extending opening.

It is achieved that the workpieces to be irradiated essentially on the rest on the lower end of the container, while the shell of the drum only has a supportive effect, whereby a better cleaning effect is achieved.

This method using sandblasting, which, generally speaking, also works Cleaning purposes, in this case cleaning the surface, especially of castings Serves smaller in scope, offered no suggestion for solving the problem of the present invention underlying.

The object that the invention has set itself is to create a device with which mechanically and automatically the inside of containers, in particular barrels, canisters or the like., both the side and the bottom surfaces by blasting with sand or steel gravel be cleaned intensively and thoroughly. To this end, "the invention also uses sandblasting, whereby the sandblasting head moves up and down in relation to the container to be cleaned emotional.

According to the invention is for this purpose for clamping the container to be cleaned one around the open and downwardly movable sandblasting head rotatable, inclined to the direction of movement of the sandblasting head, for the passage of the sandblasting head off-center drilled plate on which the to be cleaned Container is attached with the opening pointing downwards, is provided.

The cleaning and derusting of the barrels with a machine designed in this way has opposite the following significant advantages over the previous methods: The fact that the jet head is around it passes through the rotating barrel in a diagonal direction, all inner surfaces, both the Keep the coat and its floor surfaces, irradiated with sand or steel gravel with the same intensity and thus automatically achieves even and sufficient cleaning. It requires Only a small amount of time is required (for a 200 l barrel, for example, S minutes). Since no chemicals are used, no subsequent cleaning or neutralization of the container is required.

The just mentioned advantageous effect of the machine is made even more particularly by the inventive Supported training of the sandblasting head. It has three outlets for the sand, which result in such jet directions that two of them in an axial plane of the head and the third lies in an axial plane perpendicular to this plane.

An embodiment of a sandblasting machine according to the invention is shown in the drawings shown. It shows

Fig. Ι the machine according to the invention in an overall view,

Fig. 2 the sandblasting head, cut according to H-II of Fig. 3,

Fig. 3 the sandblasting head in section according to HI-III of Fig. 2 and

* Fig. 4 shows a single part of the machine on an enlarged scale. no

The barrels to be cleaned are inclined by the clamping device 1 on such a device Plate 2 clamped that the sandblasting nozzle head 3 with vertical upward movement in Bar makes a movement in a diagonal direction. Irradiating the inside of the barrels takes the following course:

After clamping the barrels in the manner described above, the sandblasting machine switched on, d. H. by pressing an electrical Switch (which is only possible if the cabin door of the protective cabin is closed) the motor 5 is switched on, whereby the tube 6 is set in rotation via the gears 7 and 8 is and with this also the plate 2 and the clamped barrel. Once the cabin door

is opened, the sandblasting machine switches itself off again to avoid accidents will. ·

If the barrel is now in a rotating motion, the motor g must be switched on. The motor now drives the continuously variable transmission io and the transmission ii, the shaft 12, the sprocket wheel 13, the chain 14 and with this the tube 15 in the vertical direction. The transmission 10 is

ίο set so that the determined by experiment Translation the pipe 15 and the sandblasting nozzle head 3 moves only so fast that the With a single up and down movement of the sandblasting nozzle head 3, it is absolute

is cleanly cleaned and derusted.

The sandblasting itself works as follows: The pipe 15 is through a Hose connected to a free jet fan. This blows the sand through the pipe 15 and the Sandblasting nozzle head 3 as soon as the pipe 15 is driven by the motor 9. The sand will that is, blown out of the nozzle openings while the pipe 15 with the sandblasting nozzle head 3 moves up and down diagonally in the keg through the bunghole of the keg, with the keg rotating. The inner surfaces of the barrel as a result of the formation of the shown in Fig. 2 and 3 Sandblasting head 3 irradiated everywhere with the same intensity of sand.

For this purpose, the sandblasting head 3 is designed so that it has three outlet openings for the sand has such jet directions

• show that two of them lie in an axial plane of the head and the third lies in the axial plane perpendicular to this axial plane. The first and second beam direction is formed such that this third such forms with the feed direction of the head an angle of 60 to 8o ° and 130 ° to I6O and a 5-30 ^0th

So that no sand collects in the barrel, the rebounding sand is removed at the same time, and through the bunghole of the barrel, through the pipe 6, the pipe elbow 16, the suction pipe 17 into the dust pre-separator 18, from where the sand

z. B. via a bucket elevator (or directly) is fed back into the free jet fan 19 to then to be used again for blasting.

As can be seen from Figs. 1 and 4, the sand supply pipe 15 is through that of the sand discharge serving pipe elbow 16 passed through. Around the cuff located at the insertion site 21 Effective protection against the backflowing sand is above this collar a conical stripping plate 20 surrounding the supply pipe 15 is arranged. At about grains of sand still passing between the feed pipe 15 and the scraper plate 20 To keep safe away from the cuff 21 is also one below the scraper plate annular air blowing nozzle 22 is provided. The compressed air flowing out of this nozzle also blows the last grains of sand and thus reliably prevents premature wear of the sleeve and the supply pipe 15 rotating in it.

Claims (7)

Patent claims: 1. Sandblasting machine for cleaning the inner walls of containers, in particular Barrels, canisters or the like, with moving up and down in relation to the container Sandblasting head, characterized by one to the direction of movement of the sandblasting head (3) inclined rotatable plate, drilled off-center for the passage of the sandblasting head (2), on which the container to be cleaned is clamped with the opening pointing downwards. 2. Sandblasting machine according to claim 1, characterized in that the rotation of the Clamping plate (2) through a feed pipe (15) to the sandblasting head (3) concentrically surrounding hollow shaft (6) is accomplished. 3. Sandblasting machine according to claim 1 and 2, characterized by a suction device (18) known per se, which dedusts the sand discharged from the barrel via the hollow shaft (6). 4. Sandblasting machine according to claim 1 to 3, characterized in that the introduction of the sand feed pipe (15) into the sand discharge with the hollow shaft (6) connected pipe elbow (16) against the returned sand through a feed pipe (15) surrounding conical scraper plate (20) and one below the latter located annular air blowing nozzle (22) is protected. 5. Sandblasting machine according to claim 1 to 4, characterized in that the sandblasting head (3) has three outlet openings for the sand, which result in jet directions, that two of them lie in an axial plane of the head (3) and the third in one to this plane is perpendicular to the axial plane. 6. Sand-blasting machine according to claim 5, characterized in that the first and the second beam direction with the direction of the jet head (3) an angle of no 60 to 8o ° or 130 to I6O ° and the third such includes a 5-30 ⁰ . 7. Sandblasting machine according to claim 5 and 6, characterized in that the in the third jet direction effective exit opening a smaller diameter than that two others. Documents considered: German Patent Specifications Nos. 314 991, 686751. iao 1 sheet of drawings © 609 529/127 5.56 (709 891 / Ϊ 2.58)