EP0582191A1 - Apparatus and method for the treatment of sensitive surfaces, especially sculptures - Google Patents

Apparatus and method for the treatment of sensitive surfaces, especially sculptures Download PDF

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Publication number
EP0582191A1
EP0582191A1 EP93112046A EP93112046A EP0582191A1 EP 0582191 A1 EP0582191 A1 EP 0582191A1 EP 93112046 A EP93112046 A EP 93112046A EP 93112046 A EP93112046 A EP 93112046A EP 0582191 A1 EP0582191 A1 EP 0582191A1
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EP
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Prior art keywords
jet
treatment
mixing chamber
mixing
axis
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EP93112046A
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German (de)
French (fr)
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EP0582191B1 (en
Inventor
Johann Szücs
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Johann Szücs
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Priority to DE19924225590 priority Critical patent/DE4225590C2/en
Priority to DE4225590 priority
Application filed by Johann Szücs filed Critical Johann Szücs
Publication of EP0582191A1 publication Critical patent/EP0582191A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0076Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier the blasting medium being a liquid stream
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00Devices or accessories for generating abrasive blasts
    • B24C5/02Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04Nozzles therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0084Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas

Abstract

A device for the treatment, for example the cleaning of sensitive, in particular strongly contoured surfaces, such as that of sculptures made of wood, plaster, bronze and the like, has a mixing head (1) for mixing media supplied to the mixing head (1) and for spraying a medium therefrom treatment beam (50) formed. The mixing head (1) has a mixing chamber (30) into which, under pressure, a first jet with a liquid treatment agent is introduced via an inlet (12) through an inlet (12) and a second jet, the second jet, via a second inlet (20) Beam axis (22) is inclined at an angle (γ) with respect to the beam axis (11) of the first beam and extends eccentrically thereto. In this device, the inlet (12) for the first jet has a slit-shaped inlet opening (14) which is oriented such that the first jet essentially covers the cross-sectional area of the second jet in the cutting area. Sensitive, strongly contoured surfaces are treated according to the invention and in particular using this device by means of a treatment jet (50) rotating about its generating jet axis (11) with at least one treatment agent which is liquid before it is atomized. Despite its rotation, the treatment beam opens at an angle (α) of less than 30 °. <IMAGE>

Description

  • The invention relates to a device for the treatment, for example cleaning, of sensitive surfaces, in particular of strongly contoured surfaces such as that of sculptures made of wood, plaster, bronze and the like, according to the preamble of claim 1 and a method for the treatment of sensitive, strong contoured surfaces according to the preamble of claim 11.
  • When treating sensitive, strongly contoured surfaces, such as are typically found in sculptures, for example wooden, plaster or bronze figures, there is the double problem of a gentle yet thorough treatment. On the one hand, the surfaces are sensitive, which is particularly the case with protruding surfaces, for example the nose of a human figure, and in some cases they are difficult to access because, due to the surface contouring, they recede behind protrusions, faults and the like or are hidden .
  • For cleaning essentially flat and comparatively insensitive surfaces, blasting processes with abrasive particles are known which are thrown in a straight line under high pressure onto the surface to be cleaned.
  • EP 0 171 448 B1 discloses a method and a device for the same application, namely the cleaning of essentially planar, but in contrast to the previous, sensitive surfaces, according to which or in which cleaning by means of a cleaning jet rotating about its central axis he follows. The cleaning jet contains atomized water, air and a cleaning agent consisting of solid particles. The known device is essentially formed by a mixing head, into the mixing chamber of which a mixture of water and air is introduced under pressure on the one hand via an atomizing nozzle and on the other hand a mixture of air and solid particles via a further feed. A first of the two mixture flows is introduced into the mixing chamber via a simple cylindrical bore. The second mixture stream strikes the mixing chamber at an angle and an eccentricity to the first mixture stream. The two mixture flows mix and leave the mixing head as a rotating cleaning jet.
  • The use of this gentle method for treatment, for example for cleaning or polishing or for applying a protective liquid, of strongly contoured surfaces, such as those found in wooden or plaster figures in churches, is not known. For this purpose, the jet emerging from the mixing head has an excessively large opening angle.
  • Since the two mixture streams are introduced at an angle and eccentrically to one another into the mixing chamber of the known mixing head, at least one of the two pressurized streams is thrown against the mixing chamber wall opposite its inlet mouth and can produce an undesirable material removal in the impact area with increasing use of the mixing head. This undesirable effect is particularly important because of the mutual eccentricity of the two mixture flows introduced into the mixing chamber, since the mixture flow directed onto the mixing chamber wall still has a large part of its kinetic energy on impact.
  • The invention has set itself the task of avoiding the disadvantages associated with the methods and devices known from the prior art. In particular, a gentle and thorough treatment of sensitive and strongly contoured surfaces should be made possible. In a device for generating a rotating and therefore gentle treatment jet, particularly good mixing and angular momentum transmission in the mixing chamber of a mixing head with simultaneous reduction in wear of the mixing chamber wall are to be achieved.
  • This object is solved by the subject matter of claims 1 and 11, respectively.
  • Advantageous, not smoothly self-evident embodiments of the invention are claimed by the subordinate claims.
  • By using a blasting process, namely a blasting process in which the blasting content is in its When the central axis pointing in the direction of the jet progresses, the jet particles, namely atomized liquid treatment agent and / or solid polishing or grinding particles, act in the form of a gentle wiping movement on the surface to be treated. Through the use of such a blasting method according to the invention for the treatment of sensitive, highly contoured surfaces, for example of sculptures, the restoration of such objects can be considerably simplified and because of the time saved compared to the purely manual methods commonly used, for example the scraping out of dirt with appropriate hand tools or wiping with a rag. The risk of destroying a valuable object is reduced.
  • The measure according to the invention of introducing two jets inclined towards one another and with their respective central axes eccentrically to one another into a mixing chamber of a mixing head in such a way that one jet has such an extent that it is cut by the central axis of the other jet, in particular that the cross-sectional area of the second beam is largely or even substantially covered by the first beam in the common cutting area, causes good mixing and angular momentum to produce a resulting rotating beam. At the same time, wear due to material removal from the mixing chamber wall is counteracted, since the kinetic energies of the two jets are extraordinarily effectively converted into rotational energy and translation energy of the resulting mixture jet when they meet, and none of the jets can transfer a not inconsiderable part of its kinetic energy to the mixing chamber wall before the collision .
  • According to the invention, a mixture jet, which can contain a single or also a mixture of different liquid treatment agents, is introduced via a first feed through a slot-shaped inlet opening into the mixing chamber, as a result of which a jet, which is to be referred to as a wide jet and is extended transversely to the direction of jet progress arises. In this context, slit-shaped means that the inlet opening running transversely or approximately transversely to the central longitudinal axis of the broad jet has a longer and a shorter main axis. It is preferably simply rectangular, possibly with semicircular short sides. Because of its orientation, this broad jet according to the invention covers the path of the second jet, which is introduced into the mixing chamber at an angle of inclination and eccentrically to the central longitudinal axis of the wide jet, to a greater extent or even completely or almost completely. For this purpose, the longitudinal axis of the inlet opening has a transverse component to the plane which is spanned by the parallel projections of the blasting center axes of the two jets introduced into the mixing chamber. The longitudinal axis of this opening is preferably approximately at right angles on this plane.
  • The inlet with the slit-shaped opening can be designed, for example, as a slit diaphragm or, in a particularly advantageous embodiment, as the narrowest passage opening of a nozzle which tapers towards this narrowest opening and then reopens.
  • The second jet, which can contain a mixture of compressed gas and solid particles, is introduced into the mixing chamber via a second feed, the passage cross section of which according to the invention widens in its course towards the inlet into the mixing chamber. As a result, the kinetic energy of this second beam can be reduced with an otherwise identical mass throughput.
  • This effect is particularly advantageously brought about by the inventive design of a sudden widening. This is the only way to ensure that the second jet in its core area, which is eccentric to the central axis of the first jet and could shoot past the first jet, no longer has a pronounced speed peak, but instead has an overall turbulent, comparatively blunt speed profile. The second beam or its components therefore point when they meet the first beam in the direction of the beam advance at a lower speed than would be the case if the course of the second feed was even or gradually widened. As a result of the turbulence that occurs after the sudden widening, the jet content has cross-speed components, which in turn contribute to the good mixing and thus also to the improvement of the angular momentum imprinting or generation.
  • According to a preferred embodiment of the invention, the widening takes place from a first to a second circular-cylindrical passage cross section, the diameter ratio of which is in the range between 2: 3 and 4: 5, particularly preferably around 3: 4.
  • In this context, the ratio of the mixing chamber diameter, the mixing chamber preferably also having a circular cylindrical cross section, to the diameter of the inlet of the second feed into the mixing chamber being of particular interest. This ratio is preferably between 4: 3 and 6: 5, in particular 5: 4, so that in the preferred embodiment of the invention, the ratio chain of approximately 3: 4: from the diameter of the first section of the second feeder via its second section to the mixing chamber diameter. 5 results.
  • A protrusion is advantageously formed behind the area of the mixing chamber wall which is at the level of the intersection of the two mixing jets, in particular behind the area which lies in the extension of the central axis of the second jet. This projection is advantageously made as sharp as possible. This prevents or at least reduces the beam components hitting the chamber wall at an angle to the chamber wall and at the same time promotes the early formation of rotation.
    The mixture jet formed in this way and already rotating is preferably guided through a section of the mixing head which is tapered gradually, in particular continuously, and adjoins the mixing chamber and is constricted in the process. The geometry of this The section is dimensioned according to the invention such that the stretch formed as the quotient of the length and - in the case of a preferred circular-cylindrical cross-sectional shape - the inlet diameter of the section is between 4: 1 and 8: 1 and is particularly preferably 5: 1. At the same time, the taper as the quotient of the inlet and outlet diameter should be at most 4: 1 and preferably only about 2.3: 1.
  • Said projection is preferably formed in that the tapered section has a smaller diameter than the mixing chamber at its mixing chamber end and an annular projection or a circumferential shoulder is formed. The tapered section preferably abuts a sintered ring at this transition point. The diameter of the mixing chamber should be reduced by a ratio of about 5: 4, but at least the protrusion should protrude half a millimeter into the opening cross-section.
  • Advantageously, the tapered section, like the inner walls of the mixing head that preferably come into contact with the jet components, is formed by a material that has a surface that is wear-resistant but at the same time has sufficient roughness to allow the jet components to slide along easily to prevent. Basically, the desired properties can be achieved by using different ceramic materials, so that in particular the tapered section has at least one ceramic surface, but the projection itself is particularly wear-resistant as a sintered ring.
  • Furthermore, it proves to be advantageous to connect a section with an approximately constant passage cross section to the tapering section on the beam exit side. In this last section there is a further equalization and calming of the jet content.
  • In the latter two sections, the mixture jet is stabilized and stabilized in the rotation, as a result of which, in particular, a treatment jet which is particularly suitable for the main use and cone-shaped with a small opening angle can be generated.
  • The ratio of the lengths of these two sections lying one behind the other is also important. The length of the outlet-side section is advantageously at least a sixth, in particular a fifth to a quarter, of the length of the tapered section.
  • The liquid treatment agent is in most cases water. Depending on the type of treatment, the water can also be replaced by a special washing liquid or a protective liquid, for example against rust. If necessary, a corresponding mixture of different treatment agents can also be used. In the case of cleaning, solid particles are additionally fed to the mixing head as polishing or grinding particles. In principle, ice particles can also form these solid particles, with ice particles that have already crystallized being fed to the mixing head, or these ice particles are only generated in the already atomized mixture jet following the mixing chamber.
  • According to the invention, a rotating treatment jet is used which has an opening angle of less than 30 °, in particular even less than 20 °, in order to reach behind the protruding surfaces and possibly even partially hidden surfaces with the wiping movement To let the beam content act as specifically as possible only in such an area.
  • The invention is explained below with reference to a preferred embodiment with reference to the drawings. Show it:
  • Fig. 1
    a mixing head in longitudinal section; and
    Fig. 2
    an inlet with a slot-shaped inlet opening according to the cross section AA of FIG. 1st
  • 1, generally referred to as mixing head 1, a first jet of a mixture of a liquid treatment agent and a pressurized gas is fed via a first feed 10 and a second jet is fed via a second feed 20, which is a pressurized gas, an example of which is given below always called compressed air, and contains solid particles. The central axis 22 of the second feed 20 is inclined at an angle γ to the central axis 11 of the first jet introduced through the first feed 10 via an inlet 12 into the mixing chamber 30. In addition, the central axes 11 and 22 of the two beams run eccentrically past one another, so that the mixture jet formed from the two beams is set in rotation about its beam advancement direction, which coincides with the axis 11 of the first beam.
  • In the exemplary embodiment, the central axis 11 of the first jet introduced into the mixing chamber 30 via the inlet 12 points to the outlet of the mixing chamber 30. In this example, the central steel axis 11 even coincides with the axis of symmetry of the rotationally symmetrical mixing chamber 30. In a suitable arrangement of the two feeds 10 and 20 in connection with suitably selected mass or volume ratios of the two jets mixed in the mixing chamber 30, other arrangements for the jet introduction into the mixing chamber are also conceivable while maintaining an inclination angle γ and an eccentricity.
  • The mixture of compressed air and the atomized, liquid treatment agent, for which water is exemplified, which is set in rotation in the mixing chamber 30, comes after constriction in a gradually tapered section 42 adjoining the mixing chamber 30 to an outlet section 44 of the mixing head 1 Outlet section 44 is a section with an approximately constant cross-sectional profile educated. The treatment jet 50 emerging from the outlet 44 opens conically at an opening angle α of approximately 20 °, so that the treatment jet opens at the usual working distance to a cone surface which is at most five marks in size.
  • In order to achieve the most intimate possible mixing of the first and the second jet introduced into the mixing chamber and, at the same time, the best possible impulse of angular momentum, the first jet supplied via the first feed 10 is in the form of an extended one in a direction transverse to its center axis 11 and therefore as a wide jet referred to the beam introduced into the mixing chamber 30. It is thereby achieved that the cross-sectional area of the second beam, which strikes the wide beam with an eccentricity, is largely covered by the wide beam and its kinetic energy is thus absorbed in the best possible way. At the same time, the broad jet protects the area 34 of the mixing chamber wall which lies in a straight extension of the central axis 22 of the second feed 20. Without such a shielding by the wide jet, the second jet shooting past would strike the chamber wall in area 34, as could be the case, for example, with a mixing head designed according to EP 0 171 448 B1. The smaller the dimensions of a mixing head, the better. Depending on the type of the beam components contained in the second beam, including in particular solid polishing or grinding particles, without the shielding described by the first beam designed as a wide beam, a not insignificant material removal from the wall region 34 would be feared.
  • In Fig. 2, the nozzle 12 is shown at its narrowest point in cross section AA. This narrowest point is formed by a slot-shaped nozzle opening 14, which is rectangular in the exemplary embodiment, the longitudinal axis 16 of which is approximately perpendicular to the plane defined by the central longitudinal axis 11 of the nozzle 12 or of the first jet and the parallel projection 22 'of the central axis 22 of the second feed , so the direction of the second jet introduced into the mixing chamber 30. The longitudinal axis 16 of the nozzle opening 14 could, however, also extend to a predetermined extent at a different, suitable angle of inclination to this plane.
  • As shown in FIG. 1, the second feed 20 is widened toward the inlet to the mixing chamber 30. The widening is designed as a sudden widening 27, so that a first section 26 of the second feed 20 with a constant passage cross section suddenly widens to a subsequent further section 28 with a likewise constant but larger passage cross section. Turbulence occurs at the widening 27, which opens at an angle of approximately 60 ° for production reasons, but is ideally designed to be seamless, as a result of which the pulse component of the second beam pointing in the direction of the central axis 22 is reduced. An opening angle of 60 ° is the lower limit. The second jet therefore strikes the flat side of the wide jet with a pronounced turbulent flow profile. This measure contributes significantly to the reduction in wear of the area 34, while at the same time the mixing in the mixing chamber 30 is intensified due to the transverse velocity components of the jet content generated by the turbulence mentioned and the angular momentum is not adversely affected. If necessary, in the formation of such a second jet, in particular in the case of the geometry of the mixing head which will be specified in the following, even a first jet generated in a known manner, for example in accordance with the teaching of EP 0 171 448 B1, could be used.
  • The second feed 20 is formed by a circular cylindrical pipe socket 24 with the first section 26 at the connection end, which can be inserted into a feed 21 for treatment agents and has an outer diameter A which is at least 1.5 times, to form a sudden cross-sectional constriction 23. in particular approximately twice the diameter of the first section 26.
  • The described design of the mixing head 1 particularly benefits its use for treating strongly contoured surfaces such as sculptures or figures made of wood, plaster, bronze and the like, which often have strongly jagged and strongly disrupted surfaces, so that the tool used, i.e. the mixing head 1 must be designed in the correspondingly small dimensions, which can certainly be described as miniature. If the two beams hitting each other in the mixing chamber were bundled comparatively strongly, the eccentricity of their respective central axes would scarcely be preventable because of the fact that they missed each other.
  • The opening angle α of the emerging treatment beam 50 is dimensioned such that the beam impinging on the surface to be treated covers an area of less than five mark piece size, ie less than about 7 cm 2, at the typical working distance. The opening angle α of the treatment beam 50 is approximately 20 °. In any case, it is less than 30 °.
  • In order to form such a treatment jet 50, the ideally continuously tapering section 42 is formed with an extension of approximately 5: 1 following the mixing chamber 30. The term stretch is understood to mean the ratio of the length to the diameter of this circular-cylindrical section 42. Good results are achieved with extensions between 4: 1 and 8: 1.
  • On the output side, the tapered section 42 merges into a further circular-cylindrical section 44 with a constant passage cross section. In this last section 44, as it emerged in the course of the development work, the mixing is evened out again and the movements of the jet content which do not take place in the direction of rotation are calmed down.
  • The two sections 42 and 44 are inserted as a one-piece sleeve 40 made of a ceramic material in a receptacle 36 of the mixing chamber housing 32. The tapered section 42 lies on the chamber side Formation of a shoulder 39 on a sintered ring 38 with a sharp edge. The extension of the central axis 22 of the second feed 20 points into or shortly before the area 34 lying between the sintered ring 38 and the mixing chamber wall. The shoulder 39 formed behind the impact area 34 by the sintered ring 38 prevents the impinging jet components from sliding along the chamber wall, thereby the formation of rotation and further - would otherwise be undesirably delayed.
  • The coordination of the dimensions of the individual components of the mixing head 1, including the first and the second feeds 10 and 20, also plays a decisive role, in particular the length and cross-sectional area ratios of flow cross sections lying one behind the other, as well as those formed from the lengths and the cross-sectional areas or the diameters and conditions called stretch. For this purpose, reference is expressly made to FIG. 1, which is carried out in the scale 1: 1.4.
  • Thus, a connecting piece 24 forming the second feed 20 with the two sections 26 and 28 has an outer diameter, preferably of half an inch, with a suitable connection area 25 for connection to the common compressed gas sources and hoses. It has only been shown in experiments that the end face 27 at the free end of the nozzle 24 should be as flat as possible. It therefore extends flat up to the inner diameter of a pushed-on hose 21 and is only chamfered minimally on the outer edge to protect it from damage. Likewise, the end face 27 also extends as close as possible to the edge of the first section 26, which is designed as a simple bore, in order to ideally result in a sudden narrowing 23 from the cross section of the hose 23 to that of the first section 26. Experiments have shown that a rounding and even an excessive chamfering of the end face 27 surprisingly exert a not negligible, undesirable influence on the flow profile of the second jet when it is introduced into the mixing chamber 30.
  • The diameter of the first section 26 of the second feed 20 is approximately 6 mm, while the second, widened section 28 has a diameter of approximately 8 mm. The length ratio of these two sections 26 and 28 is approximately 3: 2, the length of the chamber-side section 28 being assumed to be the length of its central axis up to the cut with the mixing chamber wall and the first section 26 having a length of 20 to 40 mm, in particular of about 30 mm.
  • The diameter of the circular-cylindrical mixing chamber 30 in the exemplary embodiment is approximately 10 mm. The substantially rectangular nozzle opening 14 has a length 1 of approximately 1.2 mm and a width d of approximately 0.4 mm. The first jet also fulfills its function with a length 1 of the nozzle opening 14 of 0.8 to 1.8 mm and a width b of 0.2 to 1.2 mm. The nozzle opening 14 is at least 1.5 to at most 4 times as long as it is wide. It is preferably two to three times as long as it is wide. The length 1 of the nozzle opening 14 should not be much less than 1 tenth of the diameter of the mixing chamber 30 as a dimensioning rule, which is to be regarded as the lower limit of the ratio of the mixing chamber diameter and the opening length.
  • At its inlet on the mixing chamber side, the tapering section 42 has a diameter of approximately 8 mm, which narrows to approximately 3.5 mm towards the outlet section 44. The diameter decreases at most to a quarter of its value at the inlet on the mixing chamber side. The outlet section 44 itself then has a constant diameter of approximately 3.5 mm. Its outer outlet edge is sharp. If necessary, it is additionally designed to be particularly wear-resistant. All diameters refer to circular cylindrical cross-sectional areas.
  • It has been found that such a mixing head is also very suitable for cleaning aluminum surfaces, both for anodized aluminum and for coated aluminum, as is the case for Building facades is used.
  • Until now, such aluminum surfaces had to be cleaned by hand or with the help of chemical cleaning agents. The existing requirements according to the regulations that only a maximum of 3 µm of the aluminum surface may be removed per cleaning process could generally not be met with these conventional cleaning processes.
  • If the mixing head described here is used in conjunction with a fine-grained cleaning medium, even sensitive aluminum surfaces can be cleaned mechanically without the use of chemical cleaning agents.
  • As a fine-grained cleaning medium, the material comes into question, as described in European patent application 0 374 291, namely a mineral blasting material with a hardness (Mohs hardness) of maximum 4 and with a diameter of 0.01 to 1 mm. A particularly suitable material is dolomite.
  • As an alternative, pumice stone flour or a mixture of dolomite with pumice stone flour can also be used.
  • While cleaning around 2.3 m³ air / min. are used to clean aluminum surfaces with a much higher proportion of air, namely an air proportion that is between 3.2 and 4.2 m³ / min. lies.
  • Experiments have shown that when using dolomite as blasting material, only about 0.5 μm surface area is removed per cleaning process, ie the above-mentioned standard is met.

Claims (14)

  1. Treatment device, for example cleaning sensitive surfaces, in particular strongly contoured surfaces such as those of sculptures made of wood, plaster, bronze and the like,
    a) with a mixing head (1) for mixing media supplied from the mixing head (1) and for spraying a treatment jet (50) formed therefrom,
    b) wherein under pressure into a mixing chamber (30) of the mixing head (1) via a first feed (10) through an inlet (12) a first jet containing a liquid treatment agent and
    c) a second jet, the jet axis (22) of which is inclined at an angle (γ) with respect to the jet axis (11) of the first jet and extends eccentrically thereto, is introduced via a second feed (20),
    characterized in that
    d) the inlet (12) has a slot-shaped inlet opening (14), the longitudinal axis (16) of which is oriented such that the first jet essentially covers the cross-sectional area of the second jet in the cutting area.
  2. Apparatus according to claim 1, characterized in that the longitudinal axis (16) of the inlet opening (14) is approximately at a right angle to the plane spanned by the beam axes (11; 22) of the first and second beams.
  3. Apparatus according to claim 1 or 2, characterized in that the jet axis (11) of the first jet passing through the inlet opening (14) points approximately to the outlet of the mixing chamber (30), in particular that its jet axis (11) is rotationally symmetrical with the axis of symmetry of the trained mixing chamber (30) coincides.
  4. Device according to one of claims 1 to 3, characterized in that the length (1) of the inlet opening (14) is 1.5 to 4 times its width (b).
  5. Device according to one of claims 1 to 4, characterized in that in the course of the second feed (20) the passage cross section to the inlet into the mixing chamber (30) as a sudden widening (27), in particular as a sudden widening (27) of a first section (26) to a second section (28) with a constant, cylindrical Passage cross-sectional area is formed.
  6. Device according to Claim 5, characterized in that the second feed (20) is formed by a pipe socket (24) with the first section (26) at the connection-side end, which has an almost completely flat end face (27).
  7. Device according to one of claims 1 to 6, characterized in that to reduce or prevent sliding of jet components upstream of the intersection of the two jets, a projection (38) protrudes from the chamber wall into the chamber (30).
  8. Apparatus according to claim 7, characterized in that the projection (38) is formed by a circumferential shoulder, in particular by a sintered ring, which protrudes at least half a millimeter, in particular one millimeter, into the mixing chamber (30).
  9. Device according to one of claims 1 to 8, characterized in that the mixing head (1) gradually tapers after the mixing chamber (30), in particular after the shoulder (38).
  10. Apparatus according to one of Claims 1 to 9, characterized in that the mixing head (1), following the tapered section (42), has a section (44) on the outlet side of a constant passage cross section, in particular a circular cylindrical cross section.
  11. Process for the treatment, for example cleaning, of sensitive, highly contoured surfaces such as that of sculptures made of wood, plaster, bronze and the like, in particular using a device according to one of the preceding claims,
    characterized in that
    the treatment is carried out by means of a treatment beam (50) rotating about its generating beam axis (11) with at least one treatment agent which is liquid prior to its atomization, the treatment beam (50) opening at an angle (α) of less than 30 °.
  12. A method according to claim 11, characterized in that the treatment jet (50) contains water, a special washing or protective liquid or a mixture thereof.
  13. Method according to claim 11 or 12, characterized in that the treatment jet (50) contains solid particles, in particular solid and / or ice particles.
  14. Method according to one of claims 11 to 13, characterized in that it is used for cleaning aluminum surfaces.
EP93112046A 1992-08-03 1993-07-28 Apparatus and method for the treatment of sensitive surfaces, especially sculptures Expired - Lifetime EP0582191B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19924225590 DE4225590C2 (en) 1992-08-03 1992-08-03 Device for the treatment of sensitive surfaces, in particular sculptures
DE4225590 1992-08-03

Publications (2)

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EP0582191A1 true EP0582191A1 (en) 1994-02-09
EP0582191B1 EP0582191B1 (en) 1996-06-19

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EP93112046A Expired - Lifetime EP0582191B1 (en) 1992-08-03 1993-07-28 Apparatus and method for the treatment of sensitive surfaces, especially sculptures

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US (1) US5462605A (en)
EP (1) EP0582191B1 (en)
JP (1) JPH0655452A (en)
CN (1) CN1082464A (en)
AT (1) AT139472T (en)
AU (1) AU663607B2 (en)
CA (1) CA2100500A1 (en)
CZ (1) CZ155893A3 (en)
DE (1) DE4225590C2 (en)
HU (1) HU218517B (en)
IL (1) IL106556A (en)
NO (1) NO178917C (en)
NZ (1) NZ248319A (en)
PL (1) PL299914A1 (en)
SK (1) SK80393A3 (en)
ZA (2) ZA9302206B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999043470A1 (en) * 1998-02-25 1999-09-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for generating a two-phase gas-particle jet, in particular containing co2 dry ice particles
DE10145062B4 (en) * 2001-04-20 2004-10-28 Heinrich Schlick Gmbh beam head
WO2015101519A1 (en) * 2014-01-03 2015-07-09 Roland Heinz Fuchs Method for the surface treatment of objects, in particular for subsequent painting
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WO2018184798A1 (en) * 2017-04-04 2018-10-11 Robert Bosch Gmbh Device and method for a high-pressure fluid jet cutting process

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HUT75614A (en) 1997-05-28
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US5462605A (en) 1995-10-31
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CN1082464A (en) 1994-02-23
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HU9301993D0 (en) 1993-09-28
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HU218517B (en) 2000-09-28
NZ248319A (en) 1996-02-27

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