EP0724486A1

EP0724486A1 - Spraying-tool head

Info

Publication number: EP0724486A1
Application number: EP94930927A
Authority: EP
Inventors: Rudolf Wollin
Original assignee: WOTEC Automationssysteme GmbH
Current assignee: WOTEC Automationssysteme GmbH
Priority date: 1993-10-23
Filing date: 1994-10-24
Publication date: 1996-08-07
Anticipated expiration: 2014-10-24
Also published as: DE4336250A1; WO1995011092A1; ATE168905T1; US5916367A; ES2122343T3; EP0724486B1; DE59406571D1

Abstract

PCT No. PCT/DE94/01253 Sec. 371 Date Jun. 19, 1996 Sec. 102(e) Date Jun. 19, 1996 PCT Filed Oct. 24, 1994 PCT Pub. No. WO95/11092 PCT Pub. Date Apr. 27, 1995Proposed is a spraying-tool head (1), for use in particular in foundries, which has a distribution plate (9) fitted to an adapter (7) and, screwed onto the distribution plate, a nozzle plate (11) equipped with spray nozzles (4). The adapter as well as the distribution plate and the nozzle plate can be extended by adding screw-on or insertable modules.

Description

Spray block of a spray tool

State of the art

The invention relates to a spray block of a spraying tool for spraying spraying agents, in particular release agents, onto foundry molds according to the preamble of the main claim.

For spray quality. d. H. The quality of the release agent layer on the foundry mold after spraying has a considerable influence on where and how the spray nozzles are positioned in relation to the surface to be sprayed during spraying. This can be particularly problematic if the foundry mold has deep cavities. In order to counter this problem in particular, the known spray tools are designed very differently.

In a known generic spray block (DE-OS 40 16 368) the adapter is by a connector and a Spacer formed, which are connected to one another in a T-shape, and as a result of which the spray plates on the back and on the top are almost covered. While the connecting piece of the adapter can be shorter than the spacer, the latter must have approximately the length of the spray plates so that the required connection between the supply channels of the adapter and the connecting channels of the spray plates leading to the main channels is possible. Depending on the foundry shape, in this known spray block the foundry mold appropriately suitable spray plates are mounted on the spacer, in most cases the spacer also having to be replaced at the same time with the connecting piece in order to obtain the required covering length. Although the spray tool not only moves the spray block into the mold, but also within the mold, particularly transversely to the stroke direction, additional extension tubes are required for the spray nozzles due to the different designs of the foundry molds compensate. Such extension tubes have the disadvantage, particularly if they are relatively long, that their preset spray position can be easily adjusted in continuous operation. Especially when pushing the spray block into and out of the foundry mold, but also when removing and storing it, a slight tapping on the extension tubes can cause them to bend and change their position.

When using this generic spray block, considerable storage of spray plates and possibly spacers is required, although savings were made in the way of approaching the foundry wall and the weight of the spray block due to the construction kit selected. By another spray block (DE-AS 25 35 578 and DE-PS 37 09 666) it is known to clamp a number of spray plates together to form a spray block, in which the spraying is carried out on two sides facing away from one another, by the end faces of these spray plates facing away from one another the nozzles are arranged. The main channels run transversely to the plates, the branch channels leading to the nozzles each in the plates, throttle elements being arranged in the branch channels leading to the respective nozzles. Since the total length of the spray block is determined by the number of individual spray plates, and these each have the height and depth of the entire spray block in their extension, such a spray block is relatively heavy. In addition, depending on the number of spray plates, there are a corresponding number of parting planes with the sealing surfaces provided. A flat gasket, which extends over the parting plane and has recesses for the channel connection, is usually used as the gasket, which, in order to obtain the adequate tightness, requires relatively high clamping forces for clamping the individual spray plates of the spray block. Due to the unchangeable depth of such a block, the transverse paths to be traveled by the spraying tool are relatively long. It is advantageous that the total length of the spray block can be changed easily, but at the expense of weight. For such a spray block, it is also known to provide the end plate with spray nozzles on its wide surface or to provide the central block carried by the adapter with a minimum number of spray nozzles spraying on both sides, whereby spray plates for extending this block can be fitted on both longitudinal end faces of the central block (DE-OS 37 41 474). Flat seals are usually used as the seal between the plates assigned to one another, for which not only a very good contact plane is required, but also high clamping forces are required because of the relatively large contact surface and thus low Hertzian pressures. The use of o-rings. which can be placed in corresponding depressions arranged around the channel mouths is less common because when the plates are removed the O-rings can easily fall out and be lost.

Presentation of the invention

The spray block according to the invention with the characterizing features of the main claim has the advantage that the spray block can be expanded in all spatial directions with the simplest assembly in the manner of a modular system and can thus be flexibly adapted to the foundry shape to be sprayed in each case, in order thereby to keep the spacing as small and uniform as possible between the spray nozzles and the surface to be sprayed. A plug-in assembly system is created by the use of pins and holes associated therewith in the respective division area. In addition, you can use the k a b a re n a d d a n a c h fe s t s c h r a u b b e

Extension modules both the distance of the spray plate from the adapter can be increased, and the area next to the spray plate already provided with spray nozzles can be specifically increased by using spray modules or distributor modules with additional spray plates arranged thereon. Although this can reduce the distance of the spray nozzles from the mold surface. this does not exclude that in the case of particularly deep cavities, extension tubes are used, or that the other advantages of the known systems are retained. Appropriately, the individual modules can have different heights or widths, so that, for example, the adapter modules on both sides of the adapter are of different widths, or adapter modules of different widths are available at all. The distributor module can also have different dimensions than the distributor plate, and the spray module can also have different dimensions than the spray plate. So it is quite possible that the spray module in the spray direction protrudes closer to the surface to be sprayed over the spray plate. Another advantage of the inventive solution is the weight saving, since both the adapter and the adapter modules only have to have the width that is required for the passage of the different media channels and the arrangement of the connecting means in the form of bores, threaded bores, pins, etc. The distributor plate also need not be wider than the adapter or the adapter modules are long and, at best, requires a length given in the stroke direction corresponding to the width of the spray plate. This also minimizes the area to be sealed between the distributor plate and the spray plate. Of course, such material savings also lead to a cost reduction. The spray plates are usually arranged in such a way that spraying is carried out in two directions facing away from one another. The spray nozzles can also be adjusted in relation to their spray cone, so that the spray area can also be significantly enlarged as a result. Of course, the adapter can also be designed so that spray plates can be mounted on four sides. It is particularly advantageous that, irrespective of the number of spray plates and modules, several spray circuits with correspondingly separate media channels, depending on the design, are separate to one spray side or else to different spray sides, or also sections on one of the spray sides can stand, which in turn are separated by appropriate means such as solenoid valves. Chokes and the like are controllable. This can be determined by the channel routing both in the spray plates or modules and in the distributor plates or modules or the adapter modules.

According to an advantageous embodiment of the invention, a spacer module can be used between the distributor plate or distributor module on the one hand and the spray plate or spray module on the other hand, as a result of which the S test levels of spray plates or spray modules assigned to one another can be shifted parallel to one another. This also makes it possible for the spray nozzles to come closer to the respective molding surface to be sprayed.

According to a further advantageous embodiment of the invention, the overlap area in the division level between the adapter or adapter module and the distributor plate is less than 1/2 as large as the overlap area between the distribution board and the test board. An overlap area means half the weight and half the required clamping forces.

According to a further advantageous embodiment of the invention, the pins and bores form a plug-in connection in the manner of a modular system, the assignment of the individual pins and bores per type of plate being different, so that only the mutually assigned expansion modules can be used at the corresponding points. This prevents the wrong plates or extension modules from being inadvertently installed, which could lead to considerable damage, for example spray failure, and thus damage to the foundry. According to a further advantageous embodiment of the invention, only two screws are used for fastening per plate or per expansion module, the distances between these screws also differing depending on the type of plate. As a result, not only is a clear assignment of the individual parts which are to be mountable to one another achieved, but it is also possible to optimize the clamping force by predetermining or determining the point of application of the screw. After all, a spray plate itself can weigh up to 20 kg, whereby shear forces arise in the parting plane, which are absorbed on the one hand by the pins and on the other hand by the two screws.

According to a further advantageous embodiment of the invention, screws of only one nominal width are used, so that the assembly tool only has to have a wrench size. For example, a hexagon socket screw that can be turned using a socket wrench can be used as a screw, which makes installation much easier.

According to a further embodiment of the invention, also claimed for itself, in which, as a seal between two mutually facing surfaces of two mutually resting parts, of which at least one part in the sealing region has an opening of a channel running in the part, with a bottom and Sink having a sidewall in the corresponding area around the mouth for receiving an O-ring as a sealant, the cord diameter of which is slightly thicker than the depth of the depression, and which lies against the bottom and radially against the side wall of the depression in the installed state, is according to the invention a section of the side wall facing away from the bottom of the depression or oriented towards the surface of the part that repels the mouth is pulled inwards, so that the O-ring is automatically held by this partial engagement even when the two parts are disassembled in the lowering. As a result, an O-ring can be used instead of a flat seal even in those cases in which the risk of losing the O-ring during dismantling is particularly great, as is the case with such spray blocks. In addition to the fact that the sealing by means of an O-ring requires far less clamping forces than a flat gasket, the requirements for the quality of the surfaces facing each other are also much lower, and the sealing quality is also particularly good due to the elasticity of the O-ring.

According to a further embodiment of the invention in this regard, the circumference of the O-ring in its central O-ring plane is greater than the longest circumferential length of the side wall of the depression. This results in a natural radial tension or a certain preload in the O-ring when it is inserted into the depression.

According to a further advantageous embodiment of the invention, there is a rounded transition between the side wall and the bottom of the depression, in a further embodiment the side wall with its transitions can have a curvature corresponding to the radial outer jacket of the O-ring. The main result of this is that, in addition to preventing the O-ring from falling out of the lowering during repeated assembly and disassembly, the flexing work within the O-ring is reduced while at the same time increasing the sealing quality.

Further advantages and advantageous embodiments of the invention can be found in the following description, the drawing and the claims. drawing

Two embodiments of the object of the invention are shown in the drawing and described in more detail below. Show it:

Fig. 1 The side view of a spray block within a cut foundry mold;

Fig. 2, the in Fig. 1 shown spray block in an exploded view. and

3, .4 u. 5 two variants of installing an O-ring.

Description of the embodiments

In Fig. 1, a spray block 1 is shown in the spray function, in which it is immersed in the cavity 2 of a foundry mold 3 and sprayed the surface 5 with release agents via spray nozzles 4, with the aid of compressed air.

The spray block 1 is arranged on a support arm 6 which can move the spray block 1 in and out of the foundry mold in the stroke direction in accordance with the double arrow I and can also move the spray block 1 transversely within the mold in the spray direction in accordance with the double arrow II.

On the support arm 6, an adapter 7 is attached, on the right and left for the lateral expansion of the spray block 1 in each case two adapter modules 8 are arranged. A distributor plate 9 is in turn screwed eccentrically to the right and left of these adapter modules 8, which thus plunges far into the foundry mold 3 and onto which a spray plate 11 is screwed, on which the spray nozzles 4 are arranged. Above the distributor plates 9 - and therefore shown in dash-dot lines - at least one distributor module 12 can be fastened, on which in turn a further spray plate 11 can be mounted.

The individual plates and modules, as well as the spray nozzles, can be screwed together as required, with the aim of spraying a uniform separating layer onto the surface 5. It is achieved via the adapter modules 8 that the path II is as short as possible or not at all, in order to save especially spray energy, and that the weight of the entire spray block 1 is as small as possible.

In the exploded view of the spray block 1 shown in FIG. 2, further details of the invention can be found. So it can be clearly seen here that the distributor plate 9 corresponds in its length (in the stroke direction I) approximately to the width of the spray plate 11, but that its width is considerably shorter than half the length of the spray plate 11. This results in that the with the spray plate 11 in contact pad 13 is relatively small. In addition, the width of this distributor plate 9 corresponds to the length of the extension modules 8 or the adapter 7. These are all measures which, in addition to the better spray quality, result in a considerable saving in weight. The distributor module 12 corresponds in the illustrated embodiment in its entire dimensions to the distributor plate 9, so it is identical in construction, so that a spray plate 11 can be attached to it without any problems. also using a pad the size of that Pad 13. Of course, as stated above, the distributor module can also have other dimensions than the distributor plate. A module can therefore also be used which has only one spray circuit.

The spray plates 1 1 have end faces 14 which can be locked by closure plates 15, 1 1 spray modules 16 being inserted between the narrow end faces 14 and the closure plates 15 to expand the spray plate. The narrow end face 17 of the distributor plate 9 or the distributor module 12 can also be covered by a closure plate 15.

In the individual plates and modules there are channels for the media, namely separating agents, spray and blown air or switching air (control air), which run separately for the individual media, but also run separately for different spray circuits with the same media, and whose inputs or Mouths on the plates or modules are assigned to one another. The entire length of the plate penetrating main channels 18, which correspond to correspondingly corresponding main channels 19 of the spray modules, are present in the spray plate 11. From these main channels 18 and 19 branch channels branch off inside the plates, which lead to the spray nozzles 4, or connecting channels (not shown) also open into these main channels 18, specifically from the connecting surface facing the distributor plate 9, these connecting channels going straight through continue the distributor plate 9, the adapter modules 8 and the adapter 7. The channels can be seen in the drawing as dashed lines 21. While these channels only penetrate the adapter modules smoothly, they are crossed in the distributor plate 9 by distributor channels 22, also shown only as a dash-dotted line. In this way, the Media from the distributor plate 9 in the distributor module 12 of identical construction in this example, the upper narrow end face 17 of which is closed by a closure plate 15. The only difference between the distributor plate 9 and the distributor module 12 is that the rear of the connecting channels 23 leading to the upper spray plate and crossing the distributor channels 22 are closed at the end facing away from the spray plate 11.

The individual plates are clamped together using Allen screws 24, two of which are used per plate or module. On one of the mutually facing surfaces of these parts, pins 25 are inserted to adjust the parts to one another, which engage in correspondingly corresponding bores 26 of the other part.

3 and 5, the second embodiment of the development is shown, namely the type of installation of an O-ring 31 between two mutually opposite parallel surfaces having components 32 and 33, whereby either the mouth of a channel 34 is to be sealed to the outside or one Seal should be achieved, as a connection from a channel 34 in the component 33 to a channel 35 in the component 32, the latter being only indicated by dashed lines.

The O-ring is inserted in a depression of the component 33, which has a bottom wall 36 and a side wall 37. The mouth edge 38 of this depression is drawn inward in the direction of the O-ring 31, so that when the component 32 is separated from the component 33, the O-ring 31 remains self-retaining in the depression.

While in FIG. 3 the component 32 only lies flush against the O-ring 31, it is firmly pressed onto the component 33 in FIG. 4, as a result of which the O-ring now seals inwards is bruised. In the variant of the invention shown in FIG. 5, not only is the mouth edge 38 drawn inwards, but also the transition 39 between the side wall 37 and the base 36 is rounded, so that the O-ring is also supported on this transition area during the sealing process .

All the features shown in the description of the following claims and the drawings can be essential to the invention both individually and in any form.

LIST OF REFERENCE NUMBERS

1 spray block 3 0 -

2 cavity 3 1 O-ring

3 Foundry mold 3 2 components

4 spray nozzles 3 3 components

5 surface 34 channel

6 support arm 3 5 channel

7 adapter 3 6 bottom wall

8 adapter module 3 7 side wall

9 distributor plate 38 mouth rim

10 39th transition

11 spray plate

12 Distribution module I double arrow stroke direction

13 Connection surface I I double arrow spray direction

14 narrow face of 1 1

15 closure plate

16 spray module

17 narrow face of 9 and 12

18 main channel in 11

19 main channel in 16

20th

21 channel lines

22 distribution channel lines

23 connection channel

24 Inside hexagon screw

25 cones

26 hole

27

28

29

Claims

claims

Spray block of a spraying tool for spraying on spraying agents, in particular release agents by means of air foundry molds, which can be moved in and out of the foundry mold (3) in the stroke direction (I) and can be moved in the foundry mold (3) in or transversely to the spraying direction (II),

- With a, with the adapter (7) at least indirectly and via a connecting plane forming a connecting surface connected in the stroke direction (I) extending, spray plate (11), for receiving spray nozzles (4) on the side facing away from the adapter (7)

with an adapter that can be coupled to a support arm of a spraying machine,

- With separate media connections for media such as air and spray (Supply hoses) and / or

Supply channels on and in the support arm (6) or adapter (7),

- With media channels in the spray plate (11) as in the longitudinal direction of the plate transverse to the stroke direction (I) and into the narrow end faces of the spray plate (11) opening main channels, of which on the one hand branch channels lead to the spray nozzles, and on the other hand inputs on the connection surface of the connecting channels flow,

- With on the narrow end faces of the spray plate (11) mountable, closing the main channels and closing plates

with seals arranged in the parting planes of the individual plates for the radial sealing of the corresponding mouths and entrances of the media channels,

characterized,

- That on the connecting surface of the spray plate (11) to the adapter (7) a distributor plate (9) can be mounted, the width of which extends transversely to the stroke direction (I) is narrower than the parallel length of the spray plate (11),

- That in the distributor plate (9) for the media there are separate distribution channels, into the connecting channels from the adapter, from which branch channels lead to the connecting channels of the spray plate (11), and which point in the direction of stroke (I) narrow end faces of the distributor plate flow,

- That on the narrow end faces of the distributor plate (9) pointing in the stroke direction (I) Closure plates for the distribution channel mouths can be fitted,

- That in the area of the parting planes of the mutually mountable plates for their adjustment pins and receiving holes are provided in the mutually facing connection surfaces and

- That to expand the spray block in each case in the parting planes, ie between the individual plates or. between distribution plates and adapters, expansion modules (adapter module 8, spray module 16 and distribution module 12) can be used with media channels that are continuous from plate to plate or adapter to plate in the expansion module.

2. Spray block according to claim 1, characterized in that between the distributor plate or. Module and spray plate or module a distance module can be used.

3. Spray block according to claim 1 or 2, characterized in that the coverage area in the parting plane between the adapter (7) or adapter module (8) and distributor plate (9) is less than half as large as the coverage area (connection surface 13) between the distributor plate (9 ) and spray plate (1 1).

Spray block according to one of the preceding claims, characterized in that pins (25) and bores (26) form a plug connection in the manner of a modular system, and that the assignment of the individual pins (25) and bores (26) differs per type of plate , so that only those assigned to each other Expansion modules can be attached to expansion modules or panels.

5. Spray block according to one of the preceding claims, characterized in that only two screws (24) are used for fastening per plate or module, and that the screw spacings differ depending on the type of plate or module.

6. Spray block according to one of the preceding claims, characterized in that the screws (24) have only one nominal width (certain hexagon socket), so that the tool only has to have a wrench size.

7. Spray block according to one of the preceding claims, wherein between two mutually facing surfaces of two mutually resting parts, of which at least one part in the sealing region has an opening of a channel running into the part, with a bottom (36), a side wall (37 ) lowering in the mouth area for receiving an O-ring (31) as a sealant, the cord diameter of the O-ring being somewhat thicker than the depth of the lowering and the O-ring in the inserted state at the bottom (36) of the lowering and on whose side wall (37) abuts,

characterized,

that a facing away from the bottom (36) of the depression or towards the surface of the part having the mouth oriented portion (38) of the side wall (37) is pulled inwards so that the O-ring (31) is held in the depression by this partial engagement.

8. Seal according to claim 7, characterized in that the side wall (37) extends substantially perpendicular to the surface and is only pulled inward above the central O-ring plane.

9. Seal according to claim 7 or 8, characterized in that the circumference of the O-ring (31) in its O-ring center plane is greater than the longest circumferential length of the side wall (37) of the depression.

10. Seal according to claim 7, 8 or 9, characterized in that the cross section of the lowering is circular at least in the region of the O-ring center plane.

1 1. Sealing according to one of claims 7 to 10, characterized in that there is a rounded transition (39) between the side wall (37) and the bottom (36) of the depression.

12. Seal according to claim 7 to 1 1, characterized in that the side wall (37) has a section, the radial outer surface of the O-ring corresponding curvature (38,39).