DE4420679A1 - Spray element, especially for shaped-spray appliances - Google Patents

Abstract

What is proposed is a spray element 20, especially for shaped-spray appliances 10, which comprises a feed 42 for liquid working medium and, if appropriate, a feed 50 for control air, an atomiser device 78/80b connected to the feed 42 for working medium and a switching valve 62 controllable in a pressure-dependent manner, with an elastically pretensioned valve body 68 for selectively making or breaking the connection in the feed 42 for working medium and the atomiser device 78/80b. In the spray element 20, the valve body 68 is designed with internal elastic pretension. <IMAGE>

Description

The invention relates to a spray element, in particular for Mold spraying devices, comprising a feed for rivers working medium and possibly a supply for control air, a Zer connected to the supply for working medium dusting device, a pressure-dependent controllable switching valve with an elastically preloaded valve body for optionally establishing or breaking the connection between feeding the working medium and the atomizer Facility.

Such spray elements are, for example, in spray tools from Mold spraying devices used, such as those used in die casting, in drop forging and other manufacturing processes the hot and cold forming are needed to look after a Work the molded parts to the next work step prepare. To do this, after opening the mold, spray tool inserted between the molded parts, which then using compressed air from metal residues, lubricant residue stands and other contaminants, with lubrication sprayed fabric and also cooled by water that can.

Generic spray elements are, for example, from US Pat. No. 4,714 199 and U.S. Patent 4,365,754. With this spray ment is the valve body of the switching valve of one Pistons formed. The piston is of a screw pressure which is biased into a closed position of the switching valve, in which it prevents liquid working medium from the switching valve gets into the atomizing device. Ge According to the above, US Pat. No. 4,714,199 and US Pat US Pat. No. 4,365,754 known spray elements complex and thus expensive construction.

Another generic spray element is from the US-PS 3,807,641 known. In this spray element is the valve  body of the switching valve is made of a flexible membrane det, which is pre-selected by a helical compression spring cocked piston in a closed position of the switching valve is biased. Consequently, this also shows from US Pat. No. 3 807 641 known spray element complex and therefore cost intensive build up.

In contrast, the object of the invention is a Spray element of the generic type to specify which is more simply constructed and therefore manufactured more cost-effectively can be.

This object is achieved in that the Valve body with internal elastic preload det. By the measure specified according to the invention the valve body takes over in addition to its actual radio tion, namely as the valve body, the valve seat of the switch valve in the closed position of the valve and to prevent the passage of working medium or in the Lift open the valve from this and the Allow passage of working medium, even the radio tion, the valve body (i.e. itself) into the closing or to bias the opening direction of the switching valve. Since thus according to the invention several functions in one building are partially united, the number of sprühele drops necessary components. The spray element therefore points simple structure and can therefore be manufactured inexpensively become.

If the valve body is essentially elastic, before preferably rubber-elastic, plastic or rubber is tigt, so the valve body in a simple manner the desired properties. Here can by appropriate selection and design of the material the desired internal preload for the valve body be set specifically.  

To replace the switching valve as a unit during maintenance To be able to, it is proposed that a valve seat element is provided, which together with the valve body Switch valve forms.

A particularly simple manufacture of the valve seat element can be achieved if the valve seat element as a spray casting is made. The injection molding partially occurring and relative to a production, for example. by turning and drilling possibly larger manufacturing tolerances can be easily achieved by a elastic valve body, especially by a rubber elastic valve body.

The switching valve can be easily sprayed into the spray ment are used when in a first housing part of the spray element has a recess for receiving the switch valve is provided. Here, in the first housing also the supply for liquid working medium and control air may be formed.

The manufacture of the spray element can thereby further unite be made sure that the atomizing device a second, with the first housing part releasably connectable housing part assigned. If here the second housing part in the assembled state of the spray element, the switching valve firmly in the recess formed in the first housing part can, in the case of maintenance or repair easy access to the switching valve can be ensured.

For the simple manufacture of the spray element will continue proposed that at least one of the housing parts as Injection molded part is made.

Basically, it is conceivable to work electrostatically or to atomize through pressure nozzles or by it hits a baffle at high speed leaves, or by other methods. To work medium  To be able to atomize using compressed air is the inventor spray element according to the invention also one with the atomizer device connectable supply for working air pre see. The atomization can be done both internally mixing principle as well as the external mixing principle. Both mixing principles are known per se. Easier to open Construction of the spray element can be achieved if in the first housing part a first section of the feed for working air and a second in the second housing part Section of the supply for working air is formed.

To all with the spray element according to the invention To be able to achieve conventional spray properties will struck that the atomizer device for connection is formed with a conventional nozzle assembly.

In a preferred embodiment of the invention is before seen that the valve seat element from cylindrical symmetry is formed and on its outer circumference two of a Ven tilsitz ring projection has separate ring recesses, each in the axial direction of the valve seat element a support ring projection are limited, and each via an associated cross hole with an associated of in opposite end faces of the valve seat element trained blind holes are connected, one of the Blind holes with the feed for working medium and one whose blind hole can be connected to the atomizing device is that the valve body is cylindrical symmetrical is with a central opening in the axial direction tion that has substantially the same diameter like the support ring projections of the valve seat member, wherein the valve body both in the open and in the closed state of the switching valve with its inner circumferential surface che on the support ring projections of the valve seat element sealingly rests, and that the lifting of the valve body pers of the valve seat element and possibly with the Supply for control air connected chamber is provided. In this preferred embodiment, this stands out  Switching valve with a particularly simple design. The Ven tilkörper also takes on the function that Switch valve against leakage of liquid working medium to seal.

Basically, it is conceivable that the lifting of the valve body enabling an undercut in the first housing part is formed. Easy to achieve Chen structure of the spray element is proposed that this chamber from one in the outer peripheral surface of the Valve body provided ring recess is formed.

There are different ways of working the switching valve think bar. E.g. the switching valve can be a normally ge closed and to be opened by the pressure of the control air Valve. In training of those described above preferred embodiment, the support ring projections here to achieve simple construction essentially the same outer diameter as the valve seat ring projection have and enable the lifting of the valve body Chamber can ver with the supply for control air be bindable, the valve body in the open state of the switching valve with its inner peripheral surface as a result a control air vacuum at a distance from the valve seat Ring projection is arranged and thus the passage of Working medium allows, and wherein the valve body in closed state of the switching valve as a result of its inner preload with its inner peripheral surface on the Valve seat ring projection lies sealingly and a through prevents from working medium.

Alternatively, however, it is also possible for the valve seat element in the axial direction following the two Support ring projections on two further ring recesses points that in the area of the associated axial end of the Valve seat element each from a further ring projection are limited, with both the further ring projections as the support ring projections are essentially the same  Outer diameter as the valve seat ring projection sen that in the area of the further ring recesses of Ven tilsitzelements two with the supply for control air ver bindable control chambers are provided, between which the chamber allowing the lifting of the valve body is net, which in the open state of the switching valve Inner peripheral surface of the valve body in the area of the Ab lifting the valve body enabling chamber due to a control air overpressure prevailing in the control chambers the valve seat ring projection is lifted off and thus the Allows passage of working medium, and in the ge closed state of the switching valve of the valve body in follow its inner bias with its inner circumference surface rests sealingly on the valve seat ring projection and prevents the passage of working medium. This out leadership form has the advantage that with easier to handle working and available control air pressure that can.

To ensure in this alternative embodiment too can that the valve body reliably from the valve seat ment lifts, it is proposed that the valve body in assigned essential rigid insert elements, preferably embedded in these are that differ from the control chambers assigned control chamber sections of the valve body each Weil in an intermediate section of the valve body ken, which make it possible to lift the valve body is assigned to the chamber, one from a compression of the control chamber sections due to control air pressure re resulting deflection of the insert elements on the intermediate section is transferred and here to an expansion of the Valve body leads, which lifts it from the valve seat.

To realize an alternative way of working, this can Switch valve a normally open and by the Steuer air pressure valve to be closed. In further training the preferred embodiment discussed above the support ring projections can be larger  Have the outside diameter as the valve seat ring projection and the chamber allowing the valve body to lift off can be connected to the control air supply where with the valve body in the open state of the Schaltven tils due to its internal bias at a distance from that Valve seat ring projection is arranged and thus the Allows passage of working medium, and the Ven valve body when the switching valve is closed infol ge of a control air pressure with its inner peripheral surface on the valve seat ring projection of the valve seat element fits tightly and a passage of working medium prevented. This embodiment also has the advantage fold structure.

Realizing another alternative way of working can the switching valve be a normally closed and valve to be opened by the working medium pressure. At this embodiment can on the control air supply be dispensed with, which leads to a further simplified structure leads. In development of the be described above preferred embodiment, the support ring projections here essentially the same outer diameter as have the valve seat ring projection, the valve body in the open state of the switching valve with its Inner circumferential surface due to a working medium overpressure is arranged at a distance from the valve seat ring projection and thus allows the passage of working medium, and the valve body in the closed state of the switch valve due to its internal preload with its In sealing peripheral surface on the valve seat ring projection is present and prevents the working medium from passing through.

To ensure that the Schaltven always functions properly To ensure tils, it is proposed that the chamber allowing the lifting of the valve body a compensation line is connected to the environment.  

To increase the operational safety of the invention Spray element is further proposed that in the feed a control device for control air is seen. Depending on one of these pressure monitors device detected abnormal value of the control air pressure can interrupt the supply of working medium, for example become. This is especially the case with a normally open one switch valve to be closed by control air pressure advantageous.

The invention further relates to a valve seat element, a Valve body and a switching valve for an inventive Spray element.

Furthermore, the invention relates to a spray element, in particular for mold spraying devices, comprising a Feeder for liquid working medium, a feeder for Working air and one with the supply for working medium and atomizing device connected to working air, which a pivotable nozzle element is assigned.

Such spray elements are known and are, for example, in the mold spraying devices used by the applicant in order to these mold spraying devices on site the specific Requirements of the respective application by setting the spray direction of the individual spray elements if possible to be able to adapt well. However, it has been in practice shown that the known spray elements a relatively star ke have noise, so that the operator must work with hearing protection.

In contrast, the further object of the invention is a To provide spray element of the type described above len, which is while maintaining the pivotability of the nozzle element by a quiet operation draws.  

This object is achieved in that the Atomizer device works according to the external mixing principle and that a leading to the pivotable nozzle element cut the supply for working medium as a flexible pipe piece is formed. To atomize the working medium according to the external mixing principle is with the same atomization characteristics a lower air pressure value is required than when atomizing according to the internal mixing principle, according to which the conventional spray elements with swiveling nozzle work. According to the internal mixing principle, one must Mixing chamber can be provided, from which the compressed air high flow velocity emerges to the working atomize dium sufficiently and the achieved Atomization properties until after exiting the Maintain nozzle element. With the outside mixing principle the working medium is only broken up after exiting the nozzle dusting. At this point, the working air is on the one hand too without the support of high working air pressure strongly swirled, leading to good atomization of labor dium leads. On the other hand, enough to supply the working air a relatively low working air pressure to the outlet opening because the nozzle element has large passage cross sections can be designed for the compressed air. The latter is possible Lich, since there is no back pressure in the atomizing device must be overcome. The ones described above effects that support their effects lead to a significant reduction in noise consistently good atomization properties. Through the Use of a flexible piece of pipe is included at the same time maintaining the pivotability of the Nozzle element ensured.

The pipe section can be manufactured inexpensively if it is is made of hard plastic.

In addition to the spray direction, the spray pattern of the spray nozzle the requirements of the respective application to be able to fit, it is proposed that the relative position  a mouth opening of the feed for working medium and an outlet opening of the nozzle element in the longitudinal direction tion of the supply for working medium is adjustable.

According to an alternative further training of the Erfin dung can be achieved, for example, that the nozzle element egg ne central hole through which the flexi ble pipe section up to the area of the outlet opening stretches. In this case, the mouth of the pipe piece by simply moving the pipe piece in the Central bore adjusted relative to the outlet opening the. The pipe section can be in the central bore by Rei be kept as a result of a tight tolerance. However, it is also possible to use a suitable piece of pipe Locking means, for example a grub screw, in the central to hold the hole in position.

According to another alternative professional development from Erfin manure is provided that the nozzle element with a Inner ring rib provided central bore has that flexible pipe piece in the central bore essentially can be used up to the ring rib, and that a tube adjustable in the longitudinal direction of the central bore shaped end piece from the outlet opening into the Zen tral bore can be used. The tubular end piece can here for adjustment in the longitudinal direction of the central bore be screwed into the central bore. The End piece can also by suitable locking means, for example. a grub screw in the central hole in position ge to be hold.

A further noise reduction can be achieved if in A baffle for supplied in the area of the outlet opening Working air is provided. Through such a baffle the supplied working air is swirled more, which leads to leads to better atomization of the working medium same atomization, working with less work air pressure enables with corresponding noise reduction.  

The invention further relates to a nozzle element for use dung in a spray element according to the invention.

The invention is described below with reference to the accompanying Drawing explained in some embodiments become. It shows:

Figure 1 is a schematic view of a Formsprüheinrich device, in whose spray tool the spray element of the invention can be used.

Figure 2 is a schematic view of a spraying tool equipped with spraying elements according to the invention;

Fig. 3 shows a first embodiment of a spray element according to the invention;

Fig. 4 shows a second embodiment of a spray element according to the invention;

Fig. 5 shows a third embodiment of a spray element according to the invention;

Fig. 6 shows a fourth embodiment of a spray element according to the invention with a closed switching valve;

Approximate shape 7 is a view similar to Figure 6 of the fourth exporting, but with an open switching valve..;

Fig. 8 is a sectional view of a valve body for the fourth embodiment on an enlarged scale;

Figure 9 is a schematic and perspective view of an insertion element assembly for a valve body according to FIG. 8. FIG.

Fig. 10 shows a first embodiment of a spray nozzle element;

Fig. 11 shows a second embodiment of a Sprühdüsenele member; and

Fig. 12 shows a third embodiment of a spray nozzle element.

In Fig. 1, a mold spray device designated 10 below is shown schematically, which can be used, for example, to be used in the manufacture of components by means of a die-casting process, for. B. the aluminum pressure casting process, mold parts 12 a and 12 b to prepare a mold 12 for the next operation.

In such a die-casting a filling chamber 15a of a filling device 15 b through a filling port 15 with filled to be processed, liquid metal. At closing the metal is pressed into the mold 12 by a plunger 15 c. After the construction part thus hardened, it is removed from the mold. The molded parts 12 a, 12 b of the mold 12 are attached to a stationary clamping plate 13 a and a movable platen 13 b. The movable platen 13 b can be adjusted to open and close the mold 12 in the direction of the double arrow F. Although only two clamping plates 13 a, 13 b with two molded parts 12 a, 12 b are shown in FIG. 1, the use of more part shapes with a corresponding number of mounting plates is of course also conceivable.

The mold spraying device 10 comprises a first drive unit 14 which is fixedly arranged on an upper edge 13 c of the stationary clamping plate 13 a. With the first driving unit 14 , a second driving unit 16 is connected, which can be moved in and out horizontally relative to the first driving unit 14 in the direction of the double arrow A by means of an arm 16 a guided in the first driving unit 14 by a drive (not shown). In an analogous manner a spray tool 18, having a plurality spraying members 20, by means of a Ge in the second driving unit 16 led arm 18 a by a (drive also not shown) relative to the second driving unit 16 in the direction of the double arrow B vertically retracted and extended become.

The first driving unit 14 is connected to supply lines 22 for liquid working medium, a supply line 24 for working or blown air and a supply line 26 for control air. These supply lines 22 , 24 , 26 are guided from the first drive unit 14 to the spray tool 18 . In FIG. 1, however, for the sake of simplicity, only the sections of these lines leading to the first driving unit 14 are shown.

The supply lines 22 for working medium comprise a supply line 22 a for water and a supply line 22 b for lubricant. However, further supply lines 22 for working medium, for example for a second type of lubricant or the like, can also be provided, as indicated in FIG. 1 by the dash-dotted line 22 c. A valve device 28 is provided in the spray tool 18 or immediately upstream of it, in order to be able to switch between the different supply lines 22 a, 22 b, etc. for the working medium.

To prepare the mold 12 for the next operation, after opening the mold 12 and removing the component produced, the spraying tool 18 is moved in with the arms 16 a and 18 a between the two molded parts 12 a, 12 b. Then the molded parts 12 a, 12 b are, for example, blown air to remove metal residues, lubricant residues and other contaminants, cooled by spraying water, sprayed with lubricant in preparation for the next operation and, if necessary, dried using blown air.

The structure of the spraying tool 18 is shown in detail in FIG. 2. In the present example, six spray elements 20 are attached to the spray tool 18 . The number and orientation of the spray elements can be varied as required, depending on the particular application.

In the spraying tool 18 , a working medium main line 30 is formed, from which branch lines 32 branch off, which run in the illustration according to FIG. 2 in the plane of the drawing. From these secondary lines 32 branch in turn Ar working medium branch lines 34 which push the spraying tool in the illustration according to FIG. 2 orthogonally to the plane of the drawing. In addition, stub lines 36 for blowing or working air and 38 for control air are provided in the spraying tool 18 orthogonal to the drawing plane. These stub lines 36 and 38 are connected to corresponding (not shown) main and secondary lines for working air or control air, which lines 30 and 32 are designed accordingly. The open ends of the branch lines 34 , 36 and 38 are closed by cover plates 18 b (see FIG. 1).

The spray elements 20 can be assigned to a plurality of control circuits. For example, in Fig. 2, the Sprühele elements 20 ₁ and 20 ₄ to a control circuit S1, the Sprühelemen te 20 ₂ and 20 ₅ to a control circuit S2 and the Sprühelemen te 20 ₃ and 20 ₆ to a control circuit S3.

This assignment can be realized in a simple manner in that the spray elements 20 ₁ and 20 ₄ of the control circuit S1, the spray elements 20 ₂ and 20 ₅ of the control circuit S2 and the spray elements 20 ₃ and 20 ₆ of the control circuit S3 associated stub lines 38 for Control air are each connected to a separate main line for control air, the control air main lines of the individual control circuits being able to be supplied with control air independently of one another, for example by means of a valve device (not shown).

From the stub lines 34 for working medium supply holes 40 lead to corresponding supply lines 42 for Ar beitsmedium the spray elements 20 , from the stub lines 36 for working air supply holes 44 lead to corresponding supply lines 46 for working air of the spraying elements 20 , and from the stub lines 38 for control air lead supply holes 48 to corresponding supply lines 50 for control air of the spray elements 20 .

The inlet opening 30 a of the main line 30 shown in FIG. 2 for working medium is connected to an output line 28 d of the valve device 28 . At input lines 28 a, 28 b and 28 c of the valve device 28 , the United supply lines 22 a, 22 b and 22 c are connected. In the input lines 28 a, 28 b and 28 c are each a flow control valve 22 a1, 22 b1 and 22 c1 and a check valve 22 a2, 22 b2 and 22 c2 are arranged.

The passage opening of the control valves 22 a1, 22 b1 and 22 c1 can be set independently of one another by means of a control unit 52 via control lines 54 a, 54 b, 54 c. For example, only water can be opened by opening valve 22 a1 and valves 22 b1 and 22 c1, and only lubricant by opening valve 22 b1 and valves 22 a1 and 22 c1, or by opening valves 22 a1 and 22 accordingly b1 and closing the valve 22 c1 a lubricant mixture in a desired mixing ratio be supplied as working medium. Here, different dispensing quantities, viscosities or the like of the working media to be mixed can be taken into account by the control unit 52 , for example by different degrees of opening of the valves 22 a1, 22 b1 and 22 c1.

FIG. 3 shows a first embodiment of a spray element 20 according to the invention. The spray element 20 to a first housing part 56 and a second housing part 58 , which are preferably made as injection molded parts, with surfaces 56 a and 58 a abut each other and are screwed together by means of (not shown) bolt connections ver. In the first housing part 56 , the supply lines 42 for liquid working medium, 46 for working air and 50 for control air are formed.

The supply line 42 for working medium extends from a surface 56 a oppositely directed surface 56 b toward the surface 56 a and opens into a recess 60 of circular cross-section which is open towards a surface to 56th The recess 60 serves to receive a Schaltven valve 62 , the structure of which will be described in detail below. The supply line 46 for working air connects the two surfaces 56 a and 56 b to one another, and the supply line 50 for control air, which also starts from the surface 56 b, opens into a transverse bore 50 a, which has an outer peripheral surface 56 c of the spray element with an inner peripheral surface 60 a of the recess 60 connects. The outer end of the transverse bore 50 a is sealed by a plug 64 .

In the ready-to-use state of the spray element 20, a switching valve 62 is arranged in the recess 60 of the first housing part 56 , as described above, which comprises a valve seat element 66 and a valve body 68 . Both the valve seat element 66 and the valve body 68 are of essentially cylindrical symmetry.

The valve seat member 66 has on its outer circumferential surface two ring recesses 66 a and 66 b, which are separated in the axial direction by a ring projection 66 c forming a valve seat and are limited by two further ring projections 66 d and 66 e. The ring projections 66 c, 66 d and 66 e have essentially the same outer diameter. From the axial end faces of the valve seat member 66 , blind holes 66 f and 66 g start, the bag ends of which are connected via transverse bores 66 h and 66 i to the ring recesses 66 a and 66 b. To center the valve seat element 66 in the recess 60 , it engages with a tubular extension 66 k in the supply line 42 for the working medium. The axial length of the valve seat element 66 is dimensioned such that it is essentially flush with the surface 58 a when the spray element 20 is ready for operation. The Ven tilsitzelement 66 is preferably taken as an injection molded part.

The valve body 68 is tubular and closes the valve seat element 66 . For this purpose, an inner diameter of its passage 68 a is substantially equal to or slightly smaller than the outer diameter of the ring projections 66 c, 66 d and 66 e of the valve seat element 66 . On the outer circumference of the valve body 68 , an annular recess 68 b is formed which, together with the inner circumferential surface 60 a of the recess 60, defines a chamber 70 which enables the valve body 68 to be lifted off the valve seat 66 c. The outside diameter of the valve body 68 is substantially equal to the inside diameter of the recess 60 .

As an alternative, the chamber 70 could also be formed by an undercut 56 d indicated by dashed lines in FIG. 3. In this case, the ring recess 68 b on the outer circumference of the valve body 68 could be dispensed with.

The valve seat member 68 is of the spray element 20 in the operational status on the surface 56 a over and engages in a recess formed in the second housing portion 58 annular groove 72, which serves to center the switching valve 62nd The supply line 46 for blown air continues in the second housing part 58 in a line 74 which opens into a mixing chamber 76 via a transverse bore 74 a which is sealed at its outer end by means of a plug 74 b. The chamber 76 opens on a surface 58 b of the second housing part which is opposite the surface 58 a. In this mouth 76 a, a nozzle assembly 80 is received.

The nozzle assembly 80 comprises a tubular main part 80 a, at one end of which an external thread section 80 a1 is provided. The main part 80 a is screwed by means of the outer thread section 80 a1 into the mouth 76 a of the second housing set 58 . At its other end, the main part 80 a is formed with an external thread section 80 a2. In the area of this external thread section 80 a2, an interior 80 b of the main part 80 a is provided with an essentially spherical inner surface 80 c. On this inner surface 80 c there is a spherical cap 80 d1 of a nozzle element 80 d which is held in position by a union nut 80 e screwed to the external thread section 80 a2.

A with the blind hole 66 g of the valve seat member connected pipe section 78 extends through the chamber 76 and protrudes into the inner space 80 b of the main portion 80 a into it. In this interior 80 b, working medium emerging from the pipe section 78 is atomized by compressed air supplied from the mixing chamber 76 and blown out of the nozzle element 80 d according to the so-called internal mixing principle.

The function of the spray element 20 according to FIG. 3 will be explained below. The switching valve 62 of the spray element 20 is a normally closed valve that can be opened by a control air vacuum. In Fig. 3, the normal state of the switching valve 62 is shown, that is, its closed state. In this state, the valve body 68 lies with its inner circumferential sealing surface on the valve seat 66 c and thus binds the supply of working medium from the line 42 through the blind hole 66 f and the transverse bore 66 h, from the annular recess 66 a, between the valve seat 66 c and Ventilkör by 68 into the ring recess 66 b and further through the transverse bore 66 i, the blind hole 66 g and the pipe section 78 into the interior 80 b of the nozzle assembly 80 .

If, however, a control air negative pressure is applied to the chamber 70 via the line 50 for control air, the valve body 68 is lifted from the valve seat 66 c by this negative pressure and allows a passage of working medium between the valve seat 66 c and the valve body 68 . Now liquid working medium passes from the supply line 42 into the interior 80 b of the nozzle assembly 80 , in which it is atomized by the blown air conducted via the supply lines 46 , 74 and 74 a and the chamber 76 into the interior 80 b and carried further to the nozzle element 80 d from which it emerges as a spray.

The valve body 68 is made of an elastic material, for example rubber, and with an internal bias that biases it into the closed position, ie in the position in which it prevents the passage of working medium between the valve seat 66 c and valve body 68 .

The formation of the switching valve 62 as a normally closed valve has the advantage that if the control fails, for example due to a power failure, any further leakage of working medium is reliably prevented. However, it is also possible to form the switching valve as a normally open valve to be closed by control air pressure.

Fig. 4 shows a spray element, which is equipped with such a normally open and to be closed by control air pressure switching valve. In FIG. 4, analog parts are provided with the same reference numerals as in FIG. 3, but increased by the number 100. The spray element 120 will only be described in the following in that it differs from the spray element 20 according to FIG. 3. Otherwise, reference is hereby expressly made to the description of the spray element 20 .

The spray element 120 differs from the Sprühele element 20 shown in FIG. 3 only in that the valve seat ring protrusion 166 c of the valve seat member 166 of the switching valve 162 a smaller external diameter has, as the annular projections 166 d and 166 e. Since the diameter of the tube opening of the valve body 168 has the same or only a slightly smaller diameter than the ring projections 166 d and 166 e, in the normal state, ie in the state not acted upon by control air pressure, the switching valve 162 has a gap Sp between the inner circumferential surface the valve body 168 and the outer peripheral surface of the valve seat 166 c available. Through this gap Sp liquid working medium from the line 142 through the blind hole 166 f and the transverse bore 166 h, from the ring recess 166 a, between valve seat 166 c and valve body 168 through into the ring recess 166 b and further through the transverse bore 166 i, the blind hole 166 g and the pipe section 178 reach the interior 180 b of the nozzle assembly 180 . Here, the working medium is atomized by the blowing air conducted via the supply lines 146 , 174 and the chamber 176 into the interior 180 b of the nozzle assembly 180 and carried further to the nozzle element 180 d, from which it emerges as a spray.

To shut off the passage of working medium between valve seat 166 c and valve body 168 of the lifting of the valve body chamber 170 via the supply line 150 for control air, an excess pressure is supplied, which presses the valve body 168 against the valve seat 166 c. By controlling the control air pressure, the amount of working medium supplied can also be metered in a targeted manner. The from an elastic, preferably rubber-elastic, Ma material manufactured valve body 168 is so excited in itself that it automatically returns to its normal position in Fig. 4 Darge or open after the pilot air pressure has been switched off.

A pressure sensor 184 is arranged in the supply line 150 for control air, which detects the value of the pressure prevailing in the supply line and forwards it to the control unit 52 (see FIG. 2). If the pressure switch 184 in the supply line 150 detects an unintentional pressure drop, the control unit 52 closes the control valves 22 a1, 22 b1 and 22 c1 (see FIG. 2), so that no working medium can be supplied through the control line 142 .

In Fig. 5, a third embodiment of a spray element according to the invention is shown, which is equipped with a normally closed and by the pressure of the working medium to open the switching valve. In Fig. 5, analog parts are provided with the same reference numerals as in Fig. 3, but increased by the number 200. The Sprühele element 220 will be described in the following only insofar as it differs from the spray element 20 according to FIG. 3. Otherwise, reference is hereby expressly made to the description of the spray element 20 .

The spray element 220 differs from the Sprühele element 20 according to FIG. 3 mainly in that none of the supply line 50 for control air corresponding line is provided. The annular projection 266 c forming the valve seat has essentially the same diameter as the annular projections 266 d and 266 e. Thus, the valve body 268 in the normal or shown in Fig. 5 stood the switching valve 262 due to its inner bias voltage with its inner circumferential surface firmly on the valve seat 266 c.

If now over the supply line 242 , the blind hole 266 f, the transverse bore 266 h working medium is introduced into the annular recess 266 a, this cannot pass through the valve seat 266 c into the annular recess 266 b, since the pressure of the working medium on the valve body Hydraulic force exerted 268 is initially less than the internal biasing force of the valve body 268 . If the pressure of the working medium ever rises above a limit pressure P _G , the valve body 268 is lifted by the hydraulic force against its internal preload from the valve seat 266 c, so that working medium into the annular recess 266 b and further through the transverse bore 266 i, the blind hole 266 g and the pipe section 278 can get into the interior 280 b of the nozzle assembly 280 . Here, the working medium is atomized from the blown air via the supply lines 246 , 274 and the mixing chamber 276 into the interior 280 b of the nozzle assembly group 280 and carried further to the nozzle element 280 d, from which it emerges as a spray.

In order to be able to ensure that the valve body 268 is always lifted off the valve seat 266 c at the same limit pressure P _G , a compensating bore 282 is provided which connects the annular space 268 b on the outer circumference of the valve body 268 to the surroundings. The valve body 268 only returns to its closed position shown in FIG. 5 at a second limit pressure P _G ', which is smaller than the limit pressure P _G , since the area of the valve body 268 acted upon by the hydraulic pressure in the opening state is larger than that in the closed state acted area.

In FIG. 6, a fourth embodiment is illustrated of a contemporary spraying OF INVENTION dung, in which similar parts are given the same reference numerals as in Fig. 3, but increased by the numeral 300. The spray element 320 will only be described in the following insofar as it differs from the spray element 20 according to FIG. 3. Otherwise, reference is hereby expressly made to the description of the spray element 20 .

The spray element 320 , like the spray element 20 according to FIG. 3, is equipped with a normally closed switching valve 362 which can be opened by control air. The switching valve 362 is designed such that it can be opened with control air pressure.

The valve seat member 366 has on its outer circumferential surface in addition to the ring projections 366 d and 366 e bounded by the blind holes 366 f and 366 g ring recesses 366 a and 366 b two further ring recesses gene 366 m and 366 n, which of the Ring projections 366 d and 366 e and by further ring projections 366 o and 366 p are limited. The ring projections 366 c, 366 d, 366 e, 366 o and 366 p all have essentially the same outer diameter.

The valve body 368 is tubular. Its inner diameter is substantially equal to or slightly smaller than the outer diameter of the ring projections 366 c, 366 d, 366 e, 366 o and 366 p of the valve seat element 366 .

On the outer circumference of the valve body 368 , a ring recess 368 b is formed, which together with the inner circumferential surface of the recess 360 defines a lifting of the valve body 368 from the valve seat 366 c enabling chamber 370 a. In the assembled state of the switching valve 362 , the chamber 370 a extends substantially in the area of the annular recesses 366 a and 366 b of the valve seat elements 366 . The valve body 368 also has two ring recesses 368 c and 368 d, which together with the inner circumferential surface of the recess 360 define two chambers 370 b and 370 c. The chambers 370 a and 370 b and 370 c are separated from one another by annular projections 368 e and 368 f of the valve body 368 . In the assembled state of the switching valve 362 , the chambers 370 b and 370 c extend essentially in the region of the ring recesses 366 m and 366 n of the valve seat element 366 .

The chambers 370 b and 370 c are connected via cross bores 350 b and 350 a to the supply line 350 for control air. The chambers 370 b and 370 c could alternatively also each be formed by an undercut of the first housing part 356 .

The function of the switching valve 362 will be explained in more detail below with reference to FIGS. 6 and 7.

The switching valve 362 of the spray element 320 is a normally closed valve which can be opened by control air pressure. In contrast to the switching valve 62 according to FIG. 3, the switching valve 362 can, however, be opened by a control air overpressure.

In Fig. 6, the normal state of the switching valve 362 is set, that is, its closed state. In this state, the valve body 368 lies with its inner circumference sealingly on the valve seat 366 c and thus prevents the supply of working medium from the line 342 to the nozzle assembly 380 .

However, if a control air pressure is applied to the chambers 370 b and 370 c via the control air line 350 , the valve body 368 , as shown in FIG. 7, is pressed by this pressure into the ring recesses 366 m and 366 n. This deformation of the valve body 368 continues in the region of the valve body 368 arranged in the region of the chamber 370 a, its ring projections 368 e and 368 f acting as pivot lines, so that the valve body 368 is lifted from the valve seat 366 c in the region of the chamber 370 a is and and the passage of working medium between valve seat 366 c and valve body 368 enables.

In Fig. 8 a further embodiment of a valve body is shown, with the help of which the function described above can be realized in a particularly effective manner.

In the valve body 368 'elongated insert elements 386 are embedded, for example. Made of steel or other suitable rigid material. A longitudinal end 386 a of each insert element 386 is arranged in a section of the valve body 386 ', which is assigned to one of the outer annular grooves 368 c' and 368 d ', and the other longitudinal end 386 b of each insert element 386 is in a section from the valve body 386 'arranged, which is associated with the middle ring groove 368 b'.

As is shown in particular in FIG. 9, the insert elements 386 have expressions 386 c1, 386 c2 and 386 c3 in a central section 386 c, which are expressed in alternating directions with respect to the surface normal of each insert element 386 . The alternating expressions 386 c1, 386 c2 and 386 c3 form a through channel 386 d through which a wire bracket 388 is drawn. On the wire bracket 388 six insert elements 386 are lined up in the example shown; however, any desired, suitable number of insert elements can be provided. The wire bracket 388 is arranged in the region of the ring projection 368 e 'or 368 f' (see Fig. 8).

With a compression of the annular grooves 368 c 'and 368 d' to the arranged section of the valve body 368 'due to a control air pressure applied to the chambers 370 b and 370 c (see FIG. 7), the insert elements 386 pivot with their ends 386 a around the as Swivel axis serving wire bracket 388 inwards. As a result of the rigid nature of the insert elements 386 , the other ends 386 b of the insert elements 386 pivot outward and thereby lead to an expansion of the annular groove 386 b 'associated portion of the valve body 368 '. Thus, the lifting of the valve body 368 'from the valve seat 366 c (see FIG. 7) is reliably ensured by the insert elements 386 in a simple manner.

Alternatively, it is also possible to not insert the insert elements 386 into the valve body 368 ', but to place them on the inner circumferential surface thereof, so that they are arranged in the mounted state of the switching valve 362 between the valve seat element 366 and the valve body 368 '.

The spray element 320 according to FIG. 6 differs from the spray element 20 according to FIG. 3 further by the feedings to the nozzle assembly and the structure of the nozzle element.

The supply line 346 for blown air continues in the two-th housing part 358 in a line 374/374 a, which opens into a chamber 376 . In a mouth 376 a of this Kam mer 376 , a nozzle assembly 380 is used, whose construction corresponds essentially to that of the nozzle assembly 80 according to FIG. 3. In contrast to this, the nozzle assembly group 380, however, operates on the outside mixing principle of the nozzle element 380 d, in which working medium is atomized by swirled compressed air outside the nozzle element. A piece of pipe 378 connected to the blind hole 366 g of the valve seat element 366 for supplying working medium therefore extends to the nozzle element 380 d and through it to an outlet opening 380 f.

The structure of the nozzle element 380 d will be explained in detail below with reference to FIG. 10.

In a spherical cap 380 d1 of the nozzle member 380 is d at the outlet opening 380 for the opposite side of the nozzle member 380 has a recess 390 formed d. At its outlet end, the nozzle element 380 d has a swirl chamber 392 , into which the pipe section 378 opens. The recess 390 and the swirl chamber 392 are connected to one another via longitudinal bores 394 . The pipe section 378 is inserted into a central longitudinal bore 398 of the nozzle element 380 d and is held in this by frictional forces. Additionally or alternatively, it is possible to provide a (not shown) grub screw in the nozzle element 380 d for fastening the pipe section. In order to enable the nozzle element 380 d to be pivoted, the tube piece 378 is formed from a flexible material, for example hard plastic or the like.

As can be seen in FIGS. 6 and 7, the recess 390 is connected to the compressed air chamber 376 . Compressed air supplied from there passes through the holes 394 into the swirl chamber 392 . Again with reference to FIG. 10, the compressed air is passed through the bores 394 to a boundary wall 392 a on the outlet side of the swirl chamber 392 , which serves as a baffle for swirling the air flow. Working medium emerging from the pipe section 378 is atomized by the swirled compressed air outside the outlet opening 380 f to form a spray mist 396 .

With the above-described embodiment according to FIG. 10, a pivotable nozzle element working according to the external mixing principle can be provided in a simple manner. The external mixing principle has the advantage over the internal mixing principle that clogging of the outlet opening 380 f is almost, if not completely, closed since the working medium is atomized outside the outlet opening 380 f.

In addition, the nozzle element 380 d is characterized by its low noise level. This stems from the fact that a lower air pressure value is sufficient to atomize a predetermined amount of working medium according to the external mixing principle than to achieve predetermined atomization properties than when atomizing according to the internal mixing principle. According to the internal mixing principle, a mixing chamber must be provided, from which the compressed air emerges at high speed to atomize the working medium to a sufficient extent and to maintain these atomizing properties until after they exit the nozzle element. In contrast to this, the working medium in the external mixing principle is only atomized after it has emerged from the nozzle opening, for which a lower flow velocity is sufficient due to the better swirling of the compressed air at this outlet. Furthermore, since no back pressure has to be overcome, the nozzle element can be designed with larger passage cross sections for the compressed air. A significantly lower air pressure value is therefore required to achieve the same air throughput with the same atomization, which has a favorable effect on the noise development. The use of a baffle additionally supports the swirling of the compressed air, so that properties can be worked with the same atomization properties with an even lower flow velocity and accordingly with even lower air pressure, which leads to a further reduction in noise generation.

This is due to the fact that one uses the external mixing principle working nozzle element no mixing chamber provided that must and therefore with the same air flow with size ren passage cross-sections and accordingly lower Flow rate can work.

In the nozzle element 380 d 'shown in Fig. 11', the pipe section 378 'protrudes slightly from the outlet opening 380 f'. Otherwise, the nozzle element 380 d 'has a structure identical to the nozzle element 380 d.

Due to the different positioning of the mouth end 378 a or 378 a 'of the pipe section 378 or 378 ' relative to the outlet end 380 f or 380 f 'of the nozzle element 380 d or 380 d', a change in the spray pattern of the spray element is achieved. Based on the arrangement shown in Fig. 10, with which an opening angle α of the spray is achieved, the opening angle α 'of the spray decreases the more the pipe section 378 ' protrudes from the central bore 398 'of the nozzle element 380 d' .

In addition to the advantages already discussed above with reference to FIG. 10, the additional advantage of the free adjustability of the spray pattern of the spray element is thus achieved.

Another embodiment of the nozzle element is shown in FIG. 12. In this embodiment, the central bore 398 '' is divided by an annular flange 380 d2 '', on which the pipe section 378 '' from the side of the recess 390 '' is applied. On the outlet side is formed 'as the female threaded portion 398 a'', the central opening 398', in which an externally threaded further pipe piece screwed 399 ''. To enable the twisting of the pipe section 399 '', this can be formed, for example. With an hexagon socket section 399 a ''. The further pipe piece 399 '' can be secured against rotation, for example, by a (not shown) Ma screw in the nozzle element 380 d ''.

10 and 11, taking into account the above discussion of FIGS. 10 and 11, can easily be changed by rotating the further pipe section 399 '' relative to the nozzle element 380 d '' the opening angle α '' of the spray in a simple manner.

Although in the above embodiments the annular spaces 66 a, 66 b, 166 a, 166 b, 266 a, 266 connected to the transverse bores 66 h, 66 i, 166 h, 166 i, 266 h, 266 i, 366 h and 366 i b, 366 a and 366 b and the annular spaces 366 m and 366 n as shown in the outer peripheral surface of the valve seat element are shown and described, it is in principle also possible to form these annular spaces in the inner peripheral surface of the valve body.

In another aspect, the invention relates a method of applying a liquid mold wall agent on mold wall areas of a molding device using at least one spray element below Dosage of the flow rate of the mold wall treatment agent through a metering valve, which has a flow metering cross cut for the liquid mold wall treatment agent flows and can be influenced by a secondary fluid.  

Such a method is known from DE 36 44 184 A1 knows. Control air acts on these spray elements the valve body of the metering designed as a needle valve valve in the opening direction and moves it against the Effect of a screw that prestresses it in the closing direction compression spring until it abuts against a stop reaches. The mold wall treatment agent acts on the ven tilnadel in the radial direction and thus does not exercise any of these Force in opening or closing direction. The passage dosing cross section of only between one completely closed and a fully open position adjustable dosing valve is by means of an dosing screw adjusted and during of the spraying process kept constant.

But it is now the case that the individual sections of For men to achieve a fitting with optimal surface different properties of the mold wall need means of action. For example, when spraying a mold with lubricant or mold release agent in the Area of recesses a larger amount of lubricant needed as in the area of flat mold wall sections, because in the former case due to the peripheral surfaces of the depression a larger area must be sprayed.

That there is too little lubricant when spraying the mold For example, for locally welding the casting to the mold is easy to see. But also a saying hen the mold with too much lubricant affects the Quality of the fitting. Just consider that the Lubricant from contained in a carrier fluid Lubricants exist, as in a similar way, for example. is also the case with paints where the actual Dyes are contained in a solvent. Meets now the lubricant on the mold wall, evaporated the carrier fluid and the lubricants beat each other down on the mold wall. If there is too much lubricant sprayed a mold wall area, so the lubricant runs  and thus also the lubricants under the influence of gravity downwards without using the mold wall to a sufficient extent Cover lubricant.

In the known spraying systems, the Durchlaßdo cross-section of the metering valve to a compromise value set that both mold wall areas with low loading may use mold wall treatment agents as well as mold wall preparation with high demand for mold wall treatment agents wore. The possibility of reducing the passage cross-section to one set very low value and areas with high Need for mold wall treatment agent by repeated loading spray covering was due to the need for this Time and the resulting lack of productivity in practice only for products with very high quality requirements are taken into account.

In contrast, the object of the invention is a method for applying a liquid mold wall treatment agent ready for mold wall areas of a shaping device place, which allows one spraying, inside half a short time according to your needs Deliver amount of mold wall treatment agent.

This object is achieved in that

• a) a metering valve with a leading friction in the we Substantially free-form valve diaphragm is used;
• b) the valve membrane on one side of the mold wall means of action and on the other side of the sekun därfluid is applied;
• c) the pressure on at least one side of the membrane Flow rate setting means is affected, which at certain reproducible settings this repro flow rates which can be assigned in a ductable manner; and
• d) the different flow rates by difference The floating states of the membrane can be determined.

Air is preferably used as the secondary fluid, since this is easy to use and is available at low cost. in the The method according to the invention will therefore always follow discussed with reference to air as the secondary fluid become.

In the method according to the invention, the Durchlaßdo cross-section of the metering valve in a game of forces two pressures that set the valve membrane in ent opposite directions, opening direction and closing direction. This allows the membrane defined power relations are generated, which the Keep membrane in defined suspended states and so the reproducible and continuous adjustment ge desired flow rates between a fully open neten and a completely closed state of Do enable valve. As a result of using one of Guide friction essentially free membrane records the method according to the invention by a very short time response times of the dosing valve to a desired opening flow rate change.

A control fluid is preferably used as the secondary fluid, which does not mix with the molding liquid becomes.

It is possible to control the pressure of the mold wall treatment agent to keep constant and the pressure of the secondary fluid through Influence on the flow rate setting means too variie ren. This has the advantage of a wider range the amount of mold wall let through by the metering valve treatment agent.

However, it is also possible to control the pressure of the secondary fluid to keep constant and the pressure of the mold wall treatment by acting on the flow rate setting to vary medium. When using air as a secondary fluid can here on a separate air supply line  waived and the atmospheric pressure as a secondary fluid pressure be used.

Adjust the pressure of the mold wall treatment agent Requirement for monitoring the impact behavior of the form wall treatment agent on the respective mold wall areas and introduces the pressure of the secondary fluid according to the desired flow rate by setting the Flow rate adjusting means the pressure of the mold wall treatment after the control of the dispensed amount of mold wall treatment agent also the Properties of the spray jet by varying the pressure of the mold wall treatment agent can be changed.

In this way, for example, the Leidenfrost phenomenon can be encountered be net, which when a mold wall treatment droplet of solvent on a hot mold wall by formation of a steam cushion the wetting of the mold wall by the Droplets and therefore sufficient coverage of the shape wall with mold wall treatment agent prevented. One increases now the pressure of the mold wall treatment agent increases thereby causing the kinetic energy of the droplets to increase reduced vapor cushion formation and thus to improved Wetting the mold wall leads. So far, suffering frost'schen phenomenon only by more cooling the ent speaking mold wall areas are met. Compared to the mate, which significantly reduces the service life of the mold rial load due to the strong cooling their deterrent is that from the "harder" spray resulting increase in load by far preferred effect. In addition, by increasing the Pressure of the mold wall treatment agent due to the shortening th, possibly completely omitted cooling step Productivity of the process can be further increased.

The membrane has essentially constant pressure impact areas, so the desired flow advise be adjusted by using the through  flow rate setting means the respective pressure difference between pressure of the mold wall treatment agent and Secondary fluid is specified.

The fact that the mold wall treatment liquid is a gas Miges atomizer downstream of the flow meter cross-section is fed such that by this Zer the pressure downstream of the flow meter cross-section is not significantly influenced, can in a ensure that knowledge of the Supply pressure of the mold wall treatment agent and the pressure of the secondary fluid for the reproducible adjustment of the Flow metering cross section is sufficient. This procedure The variant is particularly important when the shape is mixed wall treatment agents and atomizers, e.g. blown air, applicable according to the external mixing principle. In one after the External mixing principle working spray element must be current Always defined pressure ratio downstream of the metering valve nisse prevail, because possible repercussions of the blowing air pressure on the pressure of the mold wall treatment agent would the proper mixing of blown air and mold wall agent outside the spray element impaired gene.

However, it is also possible to liquidate the mold wall treatment speed a gaseous atomizer with variable inflow rate downstream of the flow metering cross section such to supply the pressure downstream of the flow meter cross-section is affected, and the pressure of the mold wall treatment agent and / or the pressure of the secondary fluid according to the pressure so affected. The This process variant is particularly suitable for inside Mixing principle working spray elements applicable, at wel Chen the mixing of mold wall treatment agent and Blown air takes place in a mixing chamber. More advantageous the pressure so influenced is therefore wise in this mixture Chamber of the spray element monitored.  

By using a metering valve with a Hose membrane, which on one side, preferably the Inside, from the mold wall treatment liquid and on the other side is acted upon by the secondary fluid and together with an annular contact surface flow metering cross section defined, the Mold wall treatment agent and the secondary fluid large Areas of exposure are presented. This can the influence of essentially constant forces in terms of size, For example, one of an elasticity or an inner front tension of the membrane resulting additional clamping force, in Ratio to the pressure force that they add to be weakened, which means more precise control of itself resulting pressure forces and thus an extremely sensitive one position of the flow metering cross-section enabled.

The precise adjustability of the flow metering cross section can be achieved by using a metering valve, the Pressure of the mold wall treatment liquid and the pressure of the Pressurization surfaces of secondary fluids exposed to the operationally variable membrane shape essentially Chen are independent, can be further improved.

In another aspect, the invention relates a method of applying a liquid mold wall agent on mold wall areas of a molding device using at least one spray element below Dosage of the flow rate of the mold wall treatment agent through a metering valve, which has a flow metering cross cut for the liquid mold wall treatment agent flows, in which the spray element during a spray operation relative to the shaping device along one predetermined path is moved and the flow metering cross cut depending on the respective position on the Path specified and when passing through the path in each case current position is inevitably set.  

This process is characterized in that everyone Mold wall area of the shaping device for education a fitting with optimal properties in each case required amount of mold wall treatment agent regardless the topography of the mold wall can be precisely fed, because by the movement of the spray element relative to the shape Giving device can for example also undercut shape Wall areas are approached and sprayed precisely.

The invention further relates to a method for application of a liquid mold wall treatment agent on mold wall range at least one shaping device with the help a spray element in which the spray element during of a spray process 27915 00070 552 001000280000000200012000285912780400040 0002004420679 00004 27796ngs relative to the shaping device is moved along a predetermined path and that of the spraying element dispensed amount of the river per unit of time sigen mold wall treatment agent depending on the given position on the web and at through run the web inevitably in the respective position is set.

This method can also match the respective topography of the Take shape precisely into account. In addition, at This method also uses simple on-off valves become a constant through in the open state have flow rate. The flow rate is varied in this case a change in the duty cycle, d. H. the ratio of the length of time during the mold wall treatment agent is expelled at total time. To the For this purpose, valves can also be used that are not can be controlled via a secondary fluid, for example tromagnetically actuated valves are suitable for this. It ver it is clear that the duration of the individual valve opening intervals depending on the speed of movement of the spraying tool must be dimensioned so short along the path must be a quasi-continuous spray gives.  

Is preferred with variable web speed amount of liquid mold wall delivered per unit of time means of action taking into account the rail speed determined and / or taking Be drive parameters such as local mold temperatures caused by appropriate sensor means can be queried. It is easy see that at a certain position of the web amount of liquid mold wall delivered per unit of time means of action in a first approximation of the chosen one Path speed is proportional. The faster the train is run through, the more mold wall treatment agent must are delivered per unit of time. In a more precise approach you will still be a certain time reserve value must take into account the flight time of the droplets and which due to the movement of the spray element along the Movement component awarded to the web.

The method according to the invention is described below several process variants with reference to the attached Drawing will be explained in more detail. Show it:

Fig. 13 is a schematic representation of a Schaltungsan order for operation of a zip after Außenmischprin spray element operating according to a first variant of the method according to the invention;

Fig. 14 is a schematic representation of a Schaltungsan order for operation of a zip after Außenmischprin spray element operating according to a second variant of the method according to the invention;

Fig. 15 is a schematic representation of a Schaltungsan order for operation of a zip after Außenmischprin spray element working according to a third variant of the method according to the invention;

Fig. 16 is a schematic representation of a Schaltungsan order for operation of a zip after Innenmischprin spray element working according to a further variant of the method according to the invention.

The method according to the invention will be described in the following with reference to a spray element 20 , which is part of a mold spraying device 10 , as was described in detail above with reference to FIG. 1. The mold spray device 10 in accordance comprises FIG. 1 is an X-driving unit 14, a Y-driving unit 16 and a Z-drive unit 11 which serves for the displacement of the spraying tool 18 in a plane of the drawing in the direction substantially orthogonal.

The mold spraying device 10 serves, as was also described above, in the manufacture of components by means of a die casting process, for. B. the aluminum pressure casting process, the molded parts 12 a and 12 b of the mold 12 to prepare for the next operation. For this purpose the mold 12 and the removal of the manufactured component is after opening the spray tool 18 by means of the XYZ Fahreinhei th 14, 16, moved into the form 12 11 and there along a path C (in Fig. 1 by dash-dotted line indicated) are moved, the mold 12, for example. Blown air to remove metal residues, lubricant residues and the like, cooling by spraying with water, and sprayed with lubricant and optionally dried by means of blown air.

As one can easily see, the individual sub-areas of the molds require different treatment in preparation for the next casting process, in particular different amounts of lubricant, in order to achieve a shaped piece with optimal surface properties. Thus, when spraying a casting mold with lubricant, for example in the region of depressions 12 c, as is shown in FIG. 1, left molded part 12 b, a larger quantity of lubricant is required than in the region of flat mold wall sections.

If the mold 12 is covered with too little lubricant, the cast part may, for example, be welded locally to the mold 12 . But not only spraying the mold 12 with too little lubricant leads to insufficient lubricant covering of the mold walls, but also spraying with too much lubricant. Lubricants usually consist of lubricants dispersed in a carrier liquid, as is also known, for example, from paints in which the dyes are contained in solvents. If a droplet of lubricant hits the mold 12 , the carrier liquid evaporates and the dispersed lubricants remain on the mold wall. If the mold is sprayed with an excessive amount of lubricant, the lubricant runs downwards due to gravity, without sufficiently covering the mold wall with lubricant.

According to the foregoing, therefore, a highly individual treatment of the individual mold wall areas is desired for the production of a shaped piece that meets even the highest quality requirements. For this purpose, according to the invention, a mold spray device 10 is used, the spraying device 18 having a plurality of spray elements 20 .

The spray elements 20 can, as stated above with reference to FIG. 2, be divided into a plurality of control circuits. According to FIG. 2, all control circuits S1, S2 and S3 are fed via a single lubricant main line 30 and the separate control takes place via the separate control air supply lines 38 , which are arranged in the spray element levels 18 d arranged one behind the other in the direction orthogonal to the drawing level according to FIG. 2 (only indicated by dashed lines in Fig. 2) connect. It is of course also possible to provide separate supply lines for both control air and air for blowing as well as for lubricants for each control circuit. In addition, each spray element 20 can separately form a control circuit and can be supplied separately with control air, blown air and lubricant.

By controlling the individual control circuits in dependence on the respective XYZ position set by means of the coordinate driving units 14 , 16 , 11 along the path C, each section of the wall of the mold 12 can be sprayed in a targeted manner with work equipment or the like. By using the spray elements shown in FIGS . 3 to 12 and the method according to the invention, which will be described below with reference to FIGS . 13 to 16 using the example of some method variants, the amount of lubricant supplied to each individual wall section of the mold 12 can also be increased be metered essentially continuously metered. The lubricant quantity of the individual spray elements that is required for each coordinate unit of the XYZ driving units 14 , 16 , 11 and that is to be dispensed per unit of time can, depending on other operating parameters, such as the movement speed of the XYZ driving units, the opening angle α of the spray jet (see, for example, Fig ., are given 10 to 12) and the like. The details of the manner in which these values are specified will be discussed in more detail below.

In Fig. 13 shows a circuit arrangement for operating a working according to the external mixing principle spray element according represents a first variant of the method according to the invention Darge, wherein similar parts are seen with the same reference numerals ver as shown in Figs. 1 to 3 but increased by numeral 400.

The spray element 420 works according to the external mixing principle, which has been explained in detail above with reference to the embodiment according to FIG. 6. The metering valve 462 corresponds in structure to the metering valve 62 of the embodiment according to FIG. 3, but in contrast to this is operated as a valve which is acted upon by the pressure of the lubricant supplied to it via line 442 in the opening direction and by which the control chamber 470 Control air pressure supplied via line 450 is applied in the closing direction. A flexible tube section 478 leads from the metering valve 462 to the nozzle assembly 480 which works according to the external mixing principle.

It should be noted that the outer diameter of the Ventilkör pers 468 is substantially equal to the inner diameter of the recess 460 . The length of the valve body 468 hinge conditions is slightly greater than the sum of the depths of the recess 460 and the annular groove 472 , so that the valve body 468 when assembling the two housing parts 456 and 458 rests against the boundary walls of the recess 460 and at the same time as and downstream seal prevents the undesired escape of working medium. Of course, this also applies to the embodiments described above.

The supply line 438 for control air connected to the control line 450 is provided with a proportional valve 439 , by means of which a control unit 441 can influence the control air pressure acting on the valve body from the control chamber 470 . The control unit 441 is connected to the proportional valve via a control line 439 a. In an analogous manner, a valve unit 428 influencing the pressure of the working medium in the supply lines 430 and 442 and a proportional valve 437 influencing the pressure of the blowing air in the supply lines 436 and 446 are connected to a further control unit 452 via control lines 454 and 437 a, respectively. The structure of the valve unit 428 preferably corresponds to that of the valve unit 28 shown in FIG. 2 in order to be able to use the spray element 420 to spray different working media, in the simplest case, for example. Lubricant and water, separately or in a mixed manner. In addition, the valve unit 428 allows the pressure P _{AM of} the working medium to be varied.

When preparing the mold 12 (see FIG. 1) for the next operation, the spraying tool 18 is moved into the mold 12 by means of the XYZ driving units 14 , 16 , 11 with the aid of a computer system 481 in a program-controlled manner and there along the path C = f (X, Y, Z) is moved so that the mold 12 is completely sprayed with lubricant. In this case, the computer system 481 transmits the coordinate set (X, Y, Z) for each of an X position value, a Y position value and a Z position value of the spraying tool 18 to the control unit 452 via a data line 481 a, the operation required for each spray element 420 parameter values. These are in particular the composition and the pressure P _{AM of} the working medium to be sprayed, the pressure P _{BL of} the blown air, and the desired amount of lubricant μ _mom to be dispensed.

The kinetic energy of the sprayed droplets can be varied via the absolute pressure P _{AM of} the working medium. In the area of particularly hot mold wall areas, where the Leidenfrost phenomenon occurs increasingly, by setting a higher working fluid pressure, the wetting of the mold wall obstructing vapor cushion can be reliably pierced, so that lubricant is deposited on the mold wall to the desired extent. The setting corresponding to the desired value of the pressure P _{AM of} the working medium is transmitted to the valve 428 via the line 454 . Analogously, the setting corresponding to the desired blown air pressure P _BL is transmitted to the valve 437 .

Furthermore, the control unit 452 transfers the desired amount of lubricant μ _{mom to be} dispensed and the desired pressure P _{AM of} the working medium via two control lines 441 a and 441 b to the control unit 441 for setting the flow cross section of the metering valve 462 . The control unit 441 determines a corresponding control command from these parameters and transmits this to the valve 439 .

In a metering valve, such as. In Fig. 13 Darge presented metering valve 462 , which, when the membrane 468 has lifted from the valve seat 466 c, the pressure P _{AM of} the working medium and the pressure P _{SL of} the control air substantially constant and the same Acting surfaces, the passage metering cross section can be adjusted by influencing the difference P _AM -P _{SL of} these two pressures. If, for example, at a certain position X₀, Y₀, Z Bahn of the web C a pressure P _{AM of} the working medium higher by an amount P₀ is required, then the essentially same passage cross section Φ (X₀, Y₀, Z₀) can be achieved by the fact that the control air pressure P _{SL is} increased by the amount P₀. Since the amount of working fluid dispensed per unit of time hardly changes as a function of the pressure P _AM of the working fluid, the fluid flow rate remains essentially constant.

In determining the control command to be issued to the proportional valve 439 in each case, of course, the influence of essentially constant forces in terms of size, for example an additional closing force resulting from an elasticity or an internal tension of the membrane, is also taken into account, and also the actually existing, albeit weak Dependence of the flow rate on the working medium pressure P _AM with a constant flow cross section can be taken into account.

The supply line 438 for the control air is also provided with a pressure sensor 484 which detects the value of the pressure P _SL prevailing in this supply line and forwards it to the control unit 452 . If the pressure switch 484 detects an unintentional drop in the control air pressure, the control unit 452 issues a closing command to the valve unit 428 and possibly also to the proportional valve 437 , so that no working medium and possibly no more blown air through the supply lines 430 and 442 or 436 and 446 can be supplied.

In this context, it should be noted that the internal bias of the valve diaphragm 468 toward the closed position is not necessarily necessary to achieve the above-described control of the dispensing of working medium, but it is with regard to the fail-safe function also described above in the event of a drop of the control air pressure is advantageous since the membrane 468 in this case keeps the valve 462 closed after the supply of working medium has been shut off and prevents dripping of the working medium.

As already mentioned above, the parameters required to achieve the desired spray behavior of the spraying tool 18 , namely the pressure P _AM of the working medium to be sprayed, the pressure P _{BL of} the blown air and the desired amount of lubricant μ _mom to be dispensed for each of the spray elements 20 of the spraying tool 18 and for each position (X, Y, Z) of the web C in the computer system 481 stored.

All of these parameter values can be changed interactively by an operator with the aid of the computer system 481 . This is because, during the course of the operation of the shaping device 12, it may prove necessary to adapt some of the parameters to changed circumstances. The operator can, for example, directly from the observation of the sprayed mold 12 and the viewing device of the molded part recognize whether too much or too little working medium has been sprayed onto a specific location of the mold 12 . If too much Ar beitsmedium sprayed, this runs, as already mentioned above, on the walls 12 a, 12 b of the mold 12 downwards, and too little working medium is sprayed on, so drawing or welding points form on the molding. Furthermore, the mold 12 may have an excessive temperature in some places, which prevents proper covering of the mold wall with lubricant due to the Leidenfrost effect. It can also be thought of a sensory monitoring of the temperature of the mold walls (for example sensor 59 in FIG. 1).

If the operator has now recognized that more or less working medium has to be applied to a particular location on the mold wall, then the computer system 481 first enters this location via the keyboard 481b . Nowadays, such input is usually menu-controlled, for example. The position concerned is approached in a graphical representation of the form 12 on the monitor 481c with the aid of a computer mouse and then confirmed by pressing a key. Then the operator gives the keyboard 481 b the command to apply more or less working medium at this point. This command can be purely qualitative, but it can also contain quantitative information about the desired change. The computer system 481 then determines, based on a program predetermined for it, at which positions (X, Y, Z) of the web C for which spray elements 20 the amount of working medium sprayed per unit of time has to be changed. Entries for changing the kinetic energy of the droplets are made in an analogous manner. During the next shaping process, the operator checks whether their entries have achieved the desired result and, if necessary, changes the entries until the molded part has the desired quality.

The operator can also query the current settings for each point of the web C and each spray element 20 . The amount dispensed per unit time μ _mom on Ar beitsmedium the operator is conveniently this maximum, dispensable working medium amount indicated as a fraction of that is fully open switching valve. This display can, as shown in FIG. 13 in the detail of the display of the monitor 481c shown enlarged in the large circle, be carried out both analog (bar display) and digital. In the example shown, 75% of the maximum sprayable amount of working fluid is dispensed at the special path point (which is not shown separately).

Instead of the metering valve 462 , the passage cross-section can be changed essentially continuously as a function of the control air pressure, can also be replaced by a valve that can only be adjusted between a maximum open and a maximum closed state and in which the amount of working fluid dispensed per unit of time Influencing the duty cycle, ie the fraction of the total time during which the valve is open, can be controlled. Such valves are usually equipped with an electromagnetic valve. It is understood that the duration of the individual valve opening intervals depending on the speed of movement of the spray tool along the path must be dimensioned so short that a quasi-continuous spray results.

In Fig. 14 is a circuit arrangement for operating a working according to the external mixing principle the spray element according to a further process variant, being provided ana loge parts with the same reference numerals as in FIGS. 1 to 3 but increased by numeral 500.

The circuit arrangement shown in FIG. 14 only in that the control unit different from that of FIG. 13 552 of the additional controller 541, although the ge desired value of the output per unit time Arbeitsmit telmenge μ _mom, but not the value of pressure P _AM of the Ar funds transferred. The circuit arrangement according to FIG. 14 is therefore suitable for an operation in which the value P _{AM of} the pressure of the working medium is kept constant in terms of operation and the quantity _.mu.m dispensed per unit of time is controlled only by influencing the control air pressure P _SL .

Otherwise, the circuit arrangement according to FIG. 14 and also the spray element 520 are identical in structure and function to those shown in FIG. 13. In this regard, reference is therefore made to the description of FIG. 13 given above. In particular, what is said about the interactive change of the operating parameter values by the operator and what has been said about the structure of the valve 562 also applies to the embodiment according to FIG. 14.

In principle, it is also possible to keep the control air pressure P _SL constant and to vary the working medium pressure P _AM . A circuit arrangement which realizes this possibility is shown in FIG. 15, analog parts being provided with the same reference numerals as in FIGS. 1 to 3, but increased by the number 600.

The circuit arrangement according to FIG. 15 differs from that according to FIG. 14 only by the following points: The control unit 652 is connected via a control line 639 b to the proportional valve 639 and ensures that the control air pressure P _{SL is} kept constant. The control unit 641 however, is c via a control line 641 connected to the valve unit 628, and affect the pressure P _AM of the working fluid such that the spray 620 per unit time is the desired amount μ _mom of working medium from. Finally, the pressure switch 684 is connected to the control unit 641 so that it can issue a lock command in the event of a fall in the control air pressure of the valve unit 628 .

Otherwise, the circuit arrangement according to FIG. 15, also with regard to the design of the spray element 620 , corresponds to the embodiment according to FIG. 14, the description of which is hereby incorporated by reference.

In Fig. 16, a circuit arrangement is shown for the operation of a spray element according to a further process variant, in which similar parts are given the same reference numerals as in FIGS. 1 to 3 but increased by numeral 700.

The circuit arrangement according to FIG. 16 differs from that according to FIG. 13 only in the following points: The spray element 720 works according to the internal mixing principle, ie the working medium supplied via the valve unit 728 and the supply lines 730 and 742 and metered by the valve 762 is combined in one Mixing chamber 780 b is atomized by the blowing air supplied via the proportional valve 737 and the feed lines 736 and 746 and then blown out of the nozzle assembly 780 . The pressure P _MK building up in the mixing chamber 780 b acts back on the metering valve 762 via the pipe section 778 and changes the pressure conditions present downstream of this. Since it may well be desired to change the blown air in throughput and thus pressure, a parameter reflecting these downstream conditions must therefore be monitored and taken into account when determining the control air pressure P _SL for setting the desired quantity of lubricant dispensed per unit of time. For this purpose, a pressure sensor 785 is provided in the mixing chamber 780 b, which is connected via a signal line 785 a to the control unit 741 , which takes into account the desired amount of lubricant μ _mom (via line 741 a) and the (via line 741 b) predetermined pressure P _{AM of} the working medium and the detected pressure P _MK prevailing in the mixing chamber 780 b determines a control command for the proportional valve 739 .

Otherwise, the circuit arrangement according to FIG. 16 is identical in structure and function to that shown in FIG. 13. In this regard, reference is therefore made to the description of this FIG. 13 given above. In particular, this applies to the interactive change of the operating parameter values by the operator and what has been said about the structure of the valve 762 also for the embodiment according to FIG. 16.

Claims (49)

1. A method for applying a liquid mold wall treatment agent to mold wall areas ( 12 a, 12 b) of a shaping device ( 12 ) with the aid of at least one spray element ( 20 ) while metering the flow rate of the mold wall treatment agent through a metering valve ( 62 ) which has a flow metering cross section for the liquid Mold wall treatment agent is influenced and can be influenced by a secondary fluid, characterized by the features

• a) a metering valve ( 62 ) is used with a form-variable valve diaphragm ( 68 ) which is kept essentially free of guide friction;
• b) the valve membrane ( 68 ) is acted on one side by the mold wall treatment agent and on the other side by the secondary fluid;
• c) the pressure on at least one side of the membrane ( 68 ) is influenced by flow rate setting means ( 452 , 441 , 428 , 439 ) which, at certain reproducible settings, result in flow rates which are reproducibly assigned to them;
• d) the different flow rates are determined by different floating states of the membrane ( 68 ).

2. The method according to claim 1, characterized, that a control fluid is used as the secondary fluid, which does not ver with the mold treatment liquid is mixed. 3. The method according to any one of claims 1 and 2, characterized in that the pressure of the mold wall treatment agent is kept constant and the pressure of the secondary fluid is varied by acting on the flow rate setting means ( 452 , 441 , 428 , 439 ). 4. The method according to claim 1 or 2, characterized in that the pressure of the secondary fluid is kept constant and the pressure of the mold wall treatment agent is varied by acting on the flow rate setting means ( 452 , 441 , 428 , 439 ). 5. The method according to any one of claims 1 to 4, characterized in that the pressure of the mold wall treatment agent according to the measurement of monitoring the impact behavior of the mold wall treatment agent range on the respective mold wall ( 12 a, 12 b) is set and that by setting the flow rate setting means ( 452 , 441 , 428 , 439 ) the pressure of the secondary fluid is tracked according to the desired flow rate to the pressure of the mold wall treatment agent. 6. The method according to claim 5, characterized in that with the aid of the flow rate setting means ( 452 , 441 , 428 , 439 ), the respective pressure difference between the pressure of the mold wall treatment agent and the secondary fluid is predetermined. 7. The method according to any one of claims 1 to 6, characterized in that the mold wall treatment liquid, a gaseous atomizer downstream of the flow metering cross section (at 380 f) is fed such that the pressure downstream of the flow metering cross section is not significantly affected by this atomizer. 8. The method according to claim 1, characterized in that the mold wall treatment liquid is a gaseous atomizing agent with a variable inflow rate downstream of the flow metering cross-section (at 80 b) such that the pressure downstream of the flow metering cross-section is influenced, and that the pressure of the mold wall treatment agent and / or the pressure of the secondary fluid is tracked in accordance with the pressure so influenced. 9. The method according to claim 8, characterized in that the pressure so influenced in a mixing chamber ( 480 b) of the spray element is monitored. 10. The method according to any one of claims 1 to 9, characterized by the use of a metering valve ( 62 ) with a hose membrane ( 68 ) which is treated on one side, preferably the inside, treatment liquid from the mold wall and on the other side of the secondary fluid and together with an annular contact surface ( 66 c) defines the flow metering cross section. 11. The method according to any one of claims 1 to 10, characterized by the use of a metering valve ( 62 ), the pressure of the mold wall treatment liquid and the pressure of the secondary fluid exposed pressurizing surfaces of the operationally variable membrane shape are substantially independent. 12. The method, in particular according to one of claims 1 to 11 for applying a liquid mold wall treatment by means of on mold wall areas ( 12 a, 12 b) of a molding device ( 12 ) with the aid of at least one spray element ( 20 ) while metering the flow rate of the mold wall treatment agent through Dosing valve ( 62 ), which influences a flow metering cross section for the liquid mold wall treatment agent, characterized in that the spray element ( 20 ) is moved during a spraying operation relative to the shaping device ( 12 ) along a predetermined path and in that the flow metering cross section depending on the particular one Position (XYZ) is specified on the path and is inevitably set when the path is run in the respective position (XYZ). 13. The method, in particular according to one of claims 1 to 12, for applying a liquid mold wall treatment by means of mold wall areas ( 12 a, 12 b) of a molding device ( 12 ) with the aid of at least one spray element ( 20 ), characterized in that the spray element ( 20 ) during a spraying process rela tively to the shaping device ( 12 ) is moved along a predetermined path and that the amount of the liquid mold wall treatment agent given off by the spray element ( 20 ) per unit of time as a function of the respective position (XYZ) on the web is predetermined and is inevitably set when passing through the path in the respective position (XYZ). 14. The method according to claim 13, characterized, that with variable web speed the pro Unit of time dispensed amount of the liquid mold wall treatment agent taking into account the railway speed is determined and / or taking into account adjustment of operating parameters such as local mold temperature doors that can be queried by appropriate sensor means are.   15. Spray element ( 20 ), in particular for mold spraying devices ( 10 ), in particular for carrying out the method according to one of claims 1 to 14, comprising:

• - A feed ( 42 ) for liquid working medium and possibly a feed ( 50 ) for control air,
• - One with the supply ( 42 ) for working medium connected atomizer device ( 78/80 b),
• - A pressure-dependent controllable switching valve ( 62 ) with an elastically biased valve body ( 68 ) for optionally establishing or interrupting the connec tion between the feed ( 42 ) for working medium and the atomizer device ( 78/80 b), characterized in that the valve body ( 68 ) is designed with an internal elastic prestress.

16. Spray element ( 20 ) according to claim 15, characterized in that the valve body ( 68 ) is essentially made of elastic, preferably rubber-elastic, plastic or rubber. 17. Spray element ( 20 ) according to claim 15 or 16, characterized in that a valve seat element ( 66 ) is provided, wel ches together with the valve body ( 68 ) forms the Schaltven valve ( 62 ). 18. Spray element ( 20 ) according to claim 17, characterized in that the valve seat element ( 66 ) is made as an injection molded part. 19. Spray element ( 20 ) according to one of claims 15 to 18, characterized in that a recess ( 60 ) for receiving the switching valve ( 62 ) is provided in a first housing part ( 56 ) of the Sprühele element ( 20 ). 20. Spray element ( 20 ) according to claim 19, characterized in that in the first housing part ( 56 ) the feed ( 42 ) for liquid working medium and possibly the feed ( 50 ) for control air are formed. 21. Spray element ( 20 ) according to claim 19 or 20, characterized in that the atomizing device ( 78/80 b) is associated with a two th, with the first housing part ( 56 ) releasably connectable ren housing part ( 58 ). 22. Spray element ( 20 ) according to claim 21, characterized in that the second housing part ( 58 ) in the assembled state of the spray element ( 20 ) defines the switching valve ( 62 ) in the recess ( 60 ) formed in the first housing part ( 56 ). 23. Spray element ( 20 ) according to one of claims 19 to 22, characterized in that at least one of the housing parts ( 56 , 58 ) is made as an injection molded part. 24. Spraying element ( 20 ) according to one of claims 15 to 23, characterized in that the spraying element ( 20 ) furthermore has a feeder ( 46 ) for working air which can be connected to the sprayer device ( 78/80 b), the atomizing device ( 78 / 80 b) is designed to atomize working medium using working air. 25. Spray element ( 20 ) according to claim 24, characterized in that a first section ( 46 ) of the supply for Ar beitsluft in the first housing part ( 56 ) and a two-th section ( 74 , 74 a, 76 ) of the supply for working air in the second housing part ( 58 ) is formed. 26. Spray element ( 20 ) according to one of claims 15 to 25, characterized in that the atomizing device ( 78/80 b) for connec tion with a conventional nozzle assembly ( 80 ) is formed. 27. Spray element ( 20 ) according to one of claims 17 to 26,
characterized,
that the valve seat element ( 66 ) is formed cylindrically symmetrical and on its outer periphery two of a valve seat ring projection ( 66 c) separate Ringaus recesses ( 66 a, 66 b), each in the axial direction of the valve seat element ( 66 ) by a support ring projection ( 66 d, 66 e) for supporting the Ventilkör pers ( 68 ) are limited, and each have an associated transverse bore ( 66 h, 66 i) with an associated blind holes formed in opposite end faces of the valve seat elements ( 66 ) ( 66 f , 66 g) are connected, one ( 66 f) of the blind holes being connectable to the supply ( 42 ) for working medium and another blind hole ( 66 g) being connectable to the atomizing device ( 78/80 b),
that the valve body ( 68 ) is formed cylindrically symmetrical with an axially extending central opening ( 68 a) which has essentially the same diameter as the support ring projections ( 66 d, 66 e) of the valve seat element ( 66 ), the Ventilkör by (68) both in the open and in the closed state of the switching valve (62) with its inner circumferential surface at the support ring projections (66 d, 66 e) of the valve seat member (66) bears sealingly, and
that a chamber ( 68 b) is provided which enables the valve body ( 68 ) to be lifted off the valve seat element ( 66 ) and which can optionally be connected to the supply ( 50 ) for control air. 28. Spray element ( 20 ) according to claim 27, characterized in that the lifting off of the valve body ( 68 ) is made possible by an annular recess ( 68 b) provided in the outer peripheral surface of the valve body ( 68 ). 29. Spray element ( 20 ; 320 ) according to one of claims 15 to 28, characterized in that the switching valve ( 62 ; 362 ) is a normally closed valve which can be opened by the pressure of the control air. 30. spray element ( 20 ) according to claims 27 and 29,
characterized,
that the support ring projections ( 66 d, 66 e) essentially have the same outer diameter as the valve seat ring projection ( 66 c) and the lifting of the valve body ( 68 ) enables chamber ( 68 b) with the feed ( 50 ) is connectable for control air,
wherein the valve body ( 68 ) is arranged in the open state of the switching valve ( 62 ) with its inner circumferential surface due to a control air vacuum at a distance from the valve seat ring projection ( 66 c) and thus allows the passage of working medium, and
wherein the valve body ( 68 ) in the closed state of the switching valve ( 62 ) due to its inner bias voltage with its inner peripheral surface on the valve seat ring projection ( 66 c) sealingly and prevents passage of working medium. 31. spray element ( 320 ) according to claims 27 and 29,
characterized,
that the valve seat element ( 366 ) in the axial direction following the two support ring projections ( 366 d, 366 e) has two further ring recesses ( 366 m, 366 n), each in the area of the associated axial end of the valve seat element ( 366 ) are limited by a further ring projection ( 366 o, 366 p), both the further ring projections ( 366 o, 366 p) and the support ring projections ( 366 d, 366 e) having essentially the same outer diameter as the valve seat ring projection ( 366 c),
that in the area of the further ring recesses ( 366 m, 366 n) of the valve seat element ( 366 ) two control chambers ( 370 b, 370 c) which can be connected to the feed ( 350 ) for control air are provided, between which the lifting of the valve body ( 368 ) enabling chamber ( 370 a) is arranged,
wherein in the open state of the switching valve ( 362 ) the inner circumferential surface of the valve body ( 368 ) in the loading area of the lifting of the valve body ( 368 ) possible chamber ( 370 a) as a result of a control air pressure prevailing in the control chambers ( 370 b, 370 c) Valve seat ring projection ( 366 c) is lifted off and thus allows the passage of working medium, and
wherein in the closed state of the switching valve ( 362 ) of the valve body ( 368 ) due to its inner bias with its inner peripheral surface on the Ven tilsitz ring projection ( 366 c) sealingly and prevents passage of working medium. 32. Spraying element according to claim 31, characterized in that the valve body ( 368 ′) is assigned essentially rigid insert elements ( 386 ), preferably embedded in them, which are assigned to the control chamber sections ( 368 c ′) by the control chambers ( 370 b, 370 c). , 368 d ') of the valve body ( 368 ') each extend into an intermediate section ( 368 b ') of the valve body ( 368 '), which is associated with the lifting of the valve body ( 368 ') enabling chamber ( 370 a), one of which A compression of the control chamber sections ( 368 c ', 368 d') due to the control air pressure resulting deflection of the insert elements ( 386 ) is transferred to the intermediate section ( 368 b ') and here leads to an expansion of the valve body ( 368 '), which this from the valve seat ( 366 c) takes off. 33. spray element ( 120 ) according to any one of claims 15 to 28, characterized in that the switching valve ( 162 ) is a normally open and to be closed by the pressure of the control air Ven valve. 34. spray element ( 120 ) according to claims 27 and 33,
characterized,
that the support ring projections ( 166 d, 166 e) have a larger outer diameter than the valve seat Ringvor jump ( 166 c) and the lifting of the valve body ( 168 ) enabling chamber ( 168 b) with the guide ( 150 ) for Control air can be connected,
wherein the valve body ( 168 ) is arranged in the open state of the switching valve ( 162 ) due to its inner preload at a distance from the valve seat ring projection ( 166 c) and thus allows the passage of Arbeitsme medium, and
wherein the valve body (168) in the closed to standing of the switching valve (162) as a result of control air overpressure lies with its inner circumferential surface on the valve seat ring projection (166 c) of the valve seat member (166) sealingly and prevents passage of working medium. 35. Spray element ( 220 ) according to any one of claims 15 to 28, characterized in that the switching valve ( 262 ) is a normally closed and openable by the pressure of the working medium valve. 36. spray element ( 220 ) according to claims 27 and 35,
characterized,
that the support ring projections ( 266 d, 266 e) essentially have the same outer diameter as the valve seat ring projection ( 266 c),
wherein the valve body ( 268 ) is in the open state of the switching valve ( 262 ) with its inner circumferential surface due to a working medium overpressure at a distance from the valve seat ring projection ( 266 c) and thus allows the passage of working medium, and wherein the valve body ( 268 ) in the closed state of the switching valve ( 262 ) due to its inner bias with its inner circumferential surface on the Ven tilsitz ring projection ( 266 c) sealingly and prevents the passage of working medium. 37. spray element ( 220 ) according to claim 36, characterized in that the lifting of the valve body ( 268 ) possible chamber ( 268 b) via a compensating line ( 282 ) is connected to the environment. 38. Spray element ( 120 ) according to one of claims 15 to 37, characterized in that a pressure monitoring device ( 184 ) is provided in the feed ( 150 ) for control air. 39. Valve seat element for a spray element with the valve Seat element features according to one of claims 15 to 38. 40. Valve body for a spray element with the valve body Features according to one of claims 15 to 38. 41. Switching valve for a spray element with the switching valve Features according to one of claims 15 to 38.   42. Spray element ( 320 ), in particular for mold spraying devices, in particular for carrying out the method according to one of claims 1 to 14, comprising:

• - a feed ( 342 ) for liquid working medium,
• - A feed ( 346 ) for working air, and
• - An atomizer device ( 380 ) connected to the feed ( 342 ) for working medium and the feed ( 346 ) for working air, which is assigned a pivotable nozzle element ( 380 d), characterized in that the atomizer device ( 380 ) works according to the outside mixing principle and that a section of the feed ( 342 ) for working medium leading to the pivotable nozzle element ( 380 d) is designed as a flexible pipe section ( 378 ).

43. Spray element ( 320 ) according to claim 42, characterized in that the flexible tube piece ( 378 ) is formed from hard plastic. 44. Spray element (320) according to claim 42 or 43, characterized in that the relative position of an opening (378 a) of the feeder (342/378) for working medium and an outlet opening (380 f) of the nozzle member (380 d) in the longitudinal direction of feed ( 342/378 ) is adjustable for working medium ( 378 a / 378 a ′). 45. spray element ( 320 ) according to claim 44, characterized in that the nozzle element ( 380 d) has a central bore ( 398 ) through which the flexible pipe piece ( 378 ) extends into the region of the outlet opening ( 380 f). 46. Spray element according to claim 44, characterized in that the nozzle element ( 380 d '') with an inner ring rib ( 380 d2 '') provided central bore ( 398 '') that the flexible pipe section ( 378 '') in the Zen tralbohrung ( 398 '') can be used substantially up to the ring rib ( 380 d2 ''), and that a longitudinal end of the central bore ( 398 '') adjustable tubular end piece ( 399 '') from the outlet opening ( 380 f '') Forth in the central bore ( 398 '') can be used. 47. Spray element according to claim 46, characterized in that the tubular end piece (399 '') for adjustment in the longitudinal direction of the central bore (398 '') in the tralbohrung Zen (398 '') can be screwed. 48. Spray element according to one of claims 42 to 47, characterized in that a baffle ( 392 a) is provided for supplied working air in the region of the outlet opening ( 380 f). 49. Nozzle element for the atomizing device of a spray elements according to one of claims 42 to 48 with the Nozzle element features of one of claims 42 to 48.