Metering device having a plug valve

Abstract

In order to be able to exactly dispense even very small quantities, at least the outlet valve (16) of the metering apparatus (1) - usually a piston-type metering apparatus (1) - is designed as a plug valve (55) having an axially displaceable or rotatable valve body (52). The inlet valve (15) can likewise be a plug valve (55) or else a diaphragm valve. The design with a displaceable valve body (52) is preferred,

Description

[0001] Dosing device with plug valve

[0002] I. Area of ​​application

[0003] The invention relates to dosing devices, in particular piston dosing devices, for pasty materials with a valve, in particular an outlet valve.

[0004] II. Technical background

[0005] For non-continuously operating dosing devices, the inlet line and / or the outlet line must usually be closable by a valve.

[0006] In piston dosing systems, the desired dosing quantity is drawn into a dosing cylinder when the dosing piston is retracted. The material, usually pasty, is drawn from a storage container via a connected inlet line by retracting the dosing piston, or flows into the dosing cylinder by gravity, filling the dosing cylinder. The dosing quantity contained in the dosing cylinder is then metered out by pushing the dosing piston forward, and the material is fed via an outlet line to the desired outlet opening, usually a nozzle or an upstream mixing tube.

[0007] This is often done for two dosing cylinders next to each other at the same time, for example for binder and hardener of a two-component adhesive.

[0008] For this purpose, an inlet valve is usually installed in each inlet line and an outlet valve, usually I / O valves, is installed in each outlet line to keep the outlet line closed when filling the dosing cylinder and to keep the inlet line closed when dosing towards the outlet opening.

[0009] The inlet and outlet valves are often designed as diaphragm valves, where the component to be metered is located on only one side of the diaphragm, which can be pressed against a sealing surface from the other side of the diaphragm by means of a closing cylinder to block the flow of material through the valve. Since the material flows only slightly across the surface of the diaphragm, its wear is minimal, even with abrasive materials.

[0010] However, with very small dosing volumes compared to the volume of the working space of the open diaphragm valve, the dosing becomes too inaccurate, since the diaphragm can stretch slightly due to age or change its stiffness and thus the dosing volume can change.

[0011] III. Description of the invention a) Technical problem

[0012] It is therefore the object of the invention to provide a dosing device, in particular a piston dosing device, with a valve, in particular an outlet valve, which avoids this disadvantage. b) Solution to the problem

[0013] This object is achieved by the features of claim 1. Advantageous embodiments emerge from the subclaims.

[0014] In a generic dosing device with one or more dosers, in particular piston dosers, each having an inlet valve and an outlet valve, at least one of these two valves is designed according to the invention as a plug valve. For the purposes of the present invention, a plug valve is understood to mean a valve in which a particularly truncated-cone or cylindrical valve body is arranged in a base body so as to be pivotable about its axial direction and tightly sealed, or in which a valve body with any cross-section can be displaced axially, transversely to the direction of the passage channel for the material penetrating it, in a base body, in each case to such an extent that the openings of the passage channel, on the one hand, at least partially overlap with the adjoining extension channels (open position) or completely do not overlap with the adjoining extension channels (closed position).

[0015] Both the base body and the valve body have a through opening that usually runs radially, i.e. in a transverse direction.

[0016] (Rotatable valve body:)

[0017] By such a displacement or rotation of the valve body, the so-called plug, the orifices of its radial through-opening are brought into a partially or completely overlapping position with the orifices of the radial through-opening of the base body, the valve is partially or completely opened and the material can flow radially through the base body from one side to the other.

[0018] At least one annular surface around the respective orifice of the base body serves as the seating surface, i.e. the contact surface for the sealing surface of the valve body, at least one annular surface around the respective orifice of the valve body serves as the sealing surface, or the entire inner circumferential surface of the base body in the axial region in which its orifices are located or the entire outer circumferential surface of the valve body in the axial region in which its orifices are located. If the valve body is rotated about its axial axis relative to the base body or displaced in the axial direction to such an extent that the alternating orifices of the radial through-openings of the valve body and base body no longer overlap, the valve is closed because the outer circumference of the valve body lies tightly against the inner circumference of the base body.

[0019] In the case of a cylindrical valve body and a correspondingly cylindrical seat surface in the base body, this is achieved by correspondingly precise manufacturing tolerances, especially the diameter; in the case of the truncated cone-shaped design of the valve body and a similar seat surface in the base body, this can be achieved by axial preloading of the valve body in the direction of the tapered cross-section of the valve seat in the base body.

[0020] The basic advantage of a plug valve is that by moving or turning the valve body from the open to the closed position on the outlet side of the base body, no additional material is forced into the outlet line that connects to the valve body on the outlet side, so that very precise dosing of even very small dosing quantities is possible - especially in comparison to the volume of the radial through opening of the valve body - in contrast to other valve shapes such as a diaphragm valve.

[0021] The disadvantage of a plug valve is that the material on the seat surface of the valve can get caught between the valve body and the base body, causing relatively rapid wear on both due to their relative movement.

[0022] In order to reduce wear, a material pairing is selected between the seat surface on the base body and the sealing surface on the valve body, the materials of which have a significantly different hardness, in particular the valve body is made of the softer material, preferably a plastic such as HPU, PTFG or polyethylene, at least on its outer circumference, while the seat surface of the base body is made of a harder material, be it a harder plastic or preferably metal, in particular hardened metal.

[0023] At this point, it should be clarified that the seating surface and the sealing surface do not have to be surfaces in the geometric sense that have no extension transverse to the surface, but rather surfaces whose thickness can be different from zero.

[0024] In particular, the outer peripheral surface of the valve body, at least on its sealing surfaces, consists of a softer material with a shore hardness of at most 96, in particular at most 70, in particular at most 55 and / or a tensile strength of at most 60 MPa, in particular at most 50 MPa and / or an elongation at break of at least 350%, in particular at least 400%

[0025] This measure ensures that, on the one hand, abrasive, hard particles of the mass to be conveyed can be pressed into the softer material of this material pairing and thus do not cause any wear on this softer material and, on the other hand, the wear that occurs primarily occurs on the softer material of this material pairing, preferably the valve body, which, however, can be replaced more easily than the base body of the plug valve, which is firmly installed in the surrounding structure.

[0026] One possibility is that the outermost layer of the circumferential surface of the valve body - especially in the case of a truncated cone design - is formed as a replaceable sleeve made of soft material, and can be easily replaced on the valve body after the valve body has been removed from the base body.

[0027] Another possibility is for the valve body to be made, preferably over its entire cross-section, from the soft material of its outer circumferential surface, i.e., a solid valve body with respect to the soft material, penetrated only by the transverse bore. However, with a truncated cone design, wear can be compensated for over a long period by adjusting the valve body in the axial direction with a sufficiently large overlap of the orifices in the open valve position - if the largest diameter of the transverse bore in the valve body is relatively large compared to the cone angle of the truncated cone, for example, the cone angle to the axial direction is at least 10°, preferably at least 20°, or even better at least 30°.

[0028] This advantage does not exist with a cylindrical valve body. In this case, a wear-related diameter difference between the sealing surface of the valve body and the seat surface in the base body can only be reduced by selecting a softer material of the material pairing, particularly the sealing surface on the valve body side, that is so soft and elastic that axial compression can increase the diameter of the circumferential surface of the valve body in the axial area of ​​the orifices. This is particularly possible if the valve body is made of this softer, elastic material across its entire cross-section in the area of ​​the through-hole.

[0029] In addition, quick and easy changing of the valve body must be ensured by making the valve body easy to disassemble and assemble, preferably in less than 1 minute and without special tools, ideally completely without tools.

[0030] In the case of a rotatable, i.e. pivotable, valve body, this is operatively connected, particularly at one of its end areas, to a pivoting actuator which causes the pivoting from the open position to the closed position.

[0031] The rotary actuator is preferably a pneumatic cylinder which acts off-center and in a tangential direction on the valve body or a flange radially extending therefrom and whose piston can be retracted and extended between two end positions, or any other rotary actuator such as a gear drive or a drive by means of a threaded spindle, which in particular has a very large pitch.

[0032] As a rule, for reasons of better bearing, especially rotary bearing, the valve body is part of a plug shaft, which is mounted on both sides of the valve seat in the base body.

[0033] In the case of a truncated cone-shaped valve body, the plug shaft can be supported by roller bearings on the side of the smaller cross-section of the valve body, preferably both radially and axially, in particular in a combined radial-axial bearing, and on the side of the larger cross-section of the valve body only by a radial bearing, which enables axial adjustment, therefore often no world bearing, but only a plain bearing, whereby in particular a seal that is already present there can serve as a plain bearing.

[0034] In the design with a cross-section that remains constant in the area of ​​the sealing surface, in particular a cylindrical design, of the valve body, a bearing, in particular a rolling bearing, can be provided at least at one end area in both the radial and the axial direction, but at the other end at most in the radial direction, which enables a relative movement in the axial direction between the two end areas of the plug shaft to compress the elastic valve body or at least its circumferential surface in the axial direction.

[0035] The valve body, which is made of the softer material, is detachably connected at its end faces, preferably opposite the two adjacent end parts of the plug shaft, and can thus be easily replaced - with the plug shaft removed from the base body - by loosening the connection with the two adjacent end parts of the plug shaft and inserting a new valve body between them.

[0036] For this purpose, the connection is made, for example, by axial screwing away from the through-opening through the valve body or by radially inserting the valve body between the two end parts of the plug shaft, preferably along form-fitting, in particular undercut, reciprocal guides which hold the valve body firmly in the axial direction as well as in the direction of rotation to the rest of the plug shaft.

[0037] In addition, with this design with a constant cross-section of the valve body, at least in the area of ​​its sealing surface, an axial stop for the plug shaft is necessary with a rotatable plug shaft in order to be able to apply an axial force to the plug shaft and thus the valve body from the opposite side of the sealing body.

[0038] In the case of a plug shaft that can be moved axially for opening and closing, such a stop is not useful; instead, the two end areas of the plug shaft are preferably pre-tensioned against each other in order to cause a permanent compression and thus transverse expansion of the valve body.

[0039] This can be achieved using one or more axially extending clamping screws that pass the through-hole through the valve body—which does not necessarily have to be centrally located. With a single central clamping screw, this can be designed as a threaded bolt at one end and as a threaded hole in the opposite end, provided the through-hole runs eccentrically past the dispensing clamping screw.

[0040] In addition, a tensioning element such as a spring is preferably installed, which maintains the axial preload on the valve body over a wide wear range, for example in the form of a disc spring. It should be clarified that, despite the term "plug shaft," the cross-section of this plug shaft does not have to be rotationally symmetrical in the design in which the valve body is axially displaced between an open and a closed position, but can also be polygonal, particularly rectangular, for example.

[0041] In order to ensure that the swivel position of the plug shaft and thus of the valve body is known at all times in the case of a swivelling plug shaft, a swivel position monitoring device is provided for the valve body.

[0042] For this purpose, the plug shaft preferably has - in the axial direction away from the valve body - a radially striving extension, in particular a flange, the pivoting position of which is monitored, preferably without contact, by an angle sensor at least with regard to the two end positions and is reported to the control of the dosing device.

[0043] This can be the same radially strutted extension or flange to which the rotary actuator also engages, preferably off-center in a tangential direction.

[0044] In order to prevent the material, especially abrasive material, from penetrating between the seat surface and the sealing surface and in particular from the valve towards its bearings on both sides, flushing pockets are arranged around the plug shaft in the valve seat, i.e. in the base body.

[0045] For this purpose, flushing pockets can be arranged around the plug shaft at a distance from the actual plug valve, i.e. the seat surface, in the axial direction.

[0046] Preferably, however, the flushing pockets are arranged in the axial region of the seat surface and the sealing surface, but offset in the circumferential direction from the orifices, in particular the seat surfaces surrounding the orifices. The flushing pockets are technically connected to a flushing circuit flow and are traversed by a flushing fluid, which carries away any material entering the flushing pockets.

[0047] c) Examples of implementation

[0048] Embodiments of the invention are described in more detail below by way of example. They show:

[0049] Figures 1a, b: a section through a piston dosing device, the inlet and outlet valves of which are designed as plug valves, in different functional positions,

[0050] Figure 2a - c: a first design of the plug valve with a rotatable, truncated cone-shaped valve body cut in the axial direction of the valve body,

[0051] Figure 3a, b: a second design of the plug valve with a rotatable, cylindrical valve body in analogous views according to Figure 2a, b,

[0052] Figure 4: a 3rd design of the plug valve with a sliding

[0053] Valve body in analogous view according to Figure 3a, also with enlarged detail.

[0054] Figures 1a, b show a piston dosing device 1 in which a valve device 50 according to the invention with a plug valve 55 is used both as outlet valve 16 and as inlet valve 15, in the various movement phases.

[0055] Often, two or even more piston dosing devices 1 are arranged side by side in a dosing device for dosing several material components to be mixed together, such as the binder and hardener of an adhesive. These devices can be driven jointly, for example, by a common drive with synchronous movements of their piston rods. As shown in Figures 1a and b, an inlet line 5 opens into the dosing cylinder 3, specifically into its lower end face, via which the material M to be dosed is fed from a storage container 17 to the dosing cylinder 3 formed in the base body 2, and an outlet line 6, via which the defined dosing volume of material M contained therein after filling the dosing cylinder 3 is expelled by the dosing piston 4 toward the outlet opening 7.

[0056] Figure 1a shows the drawing of the dosing volume into the dosing cylinder 3:

[0057] The outlet valve 16 is closed and the inlet valve 15 is open, so that when the dosing piston 4 - which is moved by means of a motor 18 - is moved back in the direction of increasing volume of the working space in the dosing cylinder 3, the medium to be dosed is sucked in or flows into the dosing cylinder 3 from the storage container until the dosing piston is in the fully retracted position, which corresponds to the desired dosing volume in the dosing cylinder 3.

[0058] In this position of the dosing piston 4, the inlet valve 15 is closed and, as shown in Figure 1b, the dosing piston 4 is moved forward by means of the motor 18. The material M contained in the dosing cylinder 3 can therefore only leave the dosing cylinder 3 via the outlet line 6, which, of course, must be open for this purpose.

[0059] By pushing the dosing piston 4 forward almost to the bottom of the dosing cylinder 3, the dosing volume corresponding to the stroke volume of the dosing piston 4 is pressed out via the outlet line 6, since the outlet line 6 is constantly filled up to the outlet opening 7.

[0060] Figures 2a, b show a first design of a plug valve 55 with a truncated cone-shaped, conical valve body 52, the plug, which is rotatable about the axial direction, in the open position in axial section in Figure 2a and in the frontal plan view in Figure 2b as well as in Figure 2c in the closed position cut transversely to the axial direction 52':

[0061] As can be seen better in the detailed illustration of Figure 2a, in the open position the passage channel 52A2, which runs transversely to the axial direction and is usually designed as a transverse bore and which runs radially through the valve body 52, is aligned with the supply channels 51A2 adjoining it on both sides in the surrounding seat body 51, in that one opening 52A1 in the valve body 52 overlaps as completely as possible with the opposite opening 51A1 in the seat body 51.

[0062] If the valve body 52, which can be part of a plug shaft 53 by being axially connected between its two end regions 53a, 53b, is pivoted by means of the pivot drive 54, in this case a pneumatic cylinder, until there is no longer any overlap, the plug valve 55 is in the closed position, as can be seen in the cross-sectional view of Figure 2c.

[0063] As Figure 2b shows, the pneumatic cylinder 54 engages in an articulated manner at a fastening point of the valve body 52 or a flange 59 radially extending therefrom, or of the entire encoder shaft 53, in particular its drive-side end 53a, which is located eccentrically to the pivot axis 52', and can pivot the valve body 52 back and forth between the open and the closed pivot position when the pneumatic cylinder 54 can be acted upon from both sides.

[0064] As the enlargement in Figure 2a shows, the valve body 52, which is rotationally symmetrical about its pivot axis 52', its longitudinal extension, has a truncated cone-shaped outer peripheral contour at least in the axial region of the orifices 52A1 of its transverse bore 52A2 - which are preferably located at the same axial position, merely in different rotational positions, in particular opposite one another with respect to the pivot axis 52', the axial direction - and the seat body 51 has a similarly shaped inner peripheral contour. This inner peripheral contour 51AA consists, at least around the orifices 51A1, of a hard material as a seat surface, preferably along the entire inner peripheral contour with an axial extension that is greater than the axial extension of the orifices 51A2, in particular over the entire extension of the truncated cone-shaped region.

[0065] As can be seen in the enlargement of Figure 2a, when wear occurs on the outer circumferential surface of the truncated cone-shaped valve body 52, it can still be held in tight contact with the inner circumferential surface of the seat body 51 by further axial displacement to the right, even if the orifices 51A1 and 52A1, which are opposite one another in the open position, no longer completely overlap but only partially in the axial direction 52' in the open position.

[0066] For this reason, the plug shaft 53 is preloaded axially in the direction of the narrow end of the truncated cone-shaped area by means of the preloading element 56, such as a spring.

[0067] In this case, a wear sensor 61, for example a distance sensor 61, which is fixedly mounted and directed against the end face at the right end 53b of the plug shaft 53, can detect the wear condition and report it to the control (not shown) of the valve device 50 or the higher-level unit, for example the piston dosing 1.

[0068] The plug shaft 53 can then be pulled out axially to the left and the worn valve body 52 can be replaced.

[0069] As shown, in this case the valve body 52, which represents approximately the frustoconical region of the entire plug shaft 53 and is made of a softer material over its entire cross section than the seat body 51 - which is usually made of metal that is additionally hardened on the seat surface 51A - can be pushed in in a form-fitting manner by means of T-grooves running transversely to the longitudinal direction 52', which are formed, for example, in the end faces of the regions 53a, b of the plug shaft 53 facing it, and can therefore no longer detach from these regions 53a, b when the plug shaft 53 is in the assembled state.

[0070] The plug shaft 53 is supported on the end region 53b adjacent to the smaller diameter of the frusto-conical section by a radial roller bearing, in the opposite end region 53a, here the end region adjacent to the pivot drive 54, however, it is only supported in an elastic circumferential seal 58a, which is arranged in the seat body 51, in order to always ensure a tight connection between the valve body 52 and the seat surface 5A of the seat body 51.

[0071] In addition, the plug shaft is sealed on both sides relative to the seat body 51 by further seals 58b, c surrounding it circumferentially, closer to the truncated cone-shaped area.

[0072] From the supply channel 51 A2, further seals 58b, c, which are further axially spaced apart, a preferably annularly circumferential flushing pocket 57 is formed in the inner circumference of the seat body 51 around the plug shaft 53, which are connected to a flushing circuit via openings visible therein and are constantly or at intervals flowed through by a flushing liquid in order to remove material which reaches there from the supply channels 51 A2 despite the seals.

[0073] Furthermore, in the inner circumference of the base body 51, in the axial region of the orifices 51A1, i.e. in the truncated cone-shaped region, there are flushing pockets 57 which are shown in Figure 2c, but which only extend over a part of the circumference, namely in the region in which the orifices 52A1 of the transverse bore 52A2 are located in their rotational position of the valve body 52 corresponding to the closed valve position. These valve pockets 57 are also connected to the flushing circuit via the supply channels shown and are regularly flushed, so that for this reason alone, no material, nor any abrasive particles contained therein, can permanently deposit over a large part of the outer circumference of the valve body 52.

[0074] The end positions with regard to the pivoting position of the valve body 52 are monitored by monitoring one end, here the drive-side end, 53a of the plug shaft 53 by means of an angle sensor 60 for its rotational position about the pivot axis 52':

[0075] This can be done, as shown, with an angle sensor 60 directed onto the end face of the plug shaft 53 or, in this case, onto an extension 59 projecting radially relative to the plug shaft 53, in particular a contactless angle sensor, which can detect, with the aid of markings on this end face corresponding to the two end positions and spaced apart along the circumference, whether and in which end position the plug shaft 53 is located.

[0076] Figures 3a, b show, in the same viewing direction as Figures 2a, b, a second design of the plug valve 55, in which the valve body 52, which is also rotatable about the axial direction, has a cylindrical outer circumference and - preferably over its entire cross section - consists of a material which is so elastic that it expands in the radial direction when compressed in the axial direction.

[0077] In this way, in the event of wear on the cylindrical outer circumferential surface, the valve body 52, which is fastened between the end regions 5a, b of the plug shaft 53, which can be made of a hard material such as metal, can be compressed more axially, as shown here by two clamping screws 62a, b running axially and away from the transverse bore 52A2, which pull the two end regions 53a, b more strongly against each other. As can be seen in the enlargement of Figure 3a, the valve body 52 thereby expands radially and, despite wear, once again lies tightly and tightly against the seat surface 51A, the inner circumference of the seat body 51.

[0078] With such a cylindrical valve body 52, which is always axially in the same position relative to the seat body 51, the plug shaft 53 can be supported by roller bearings at both ends, as usual by means of a radial bearing each and an additional axial bearing on one side. As the valve body 52 becomes increasingly clamped, the end region 53b of the plug shaft 53 facing away from the axial bearing, which is located on the left side here, will increasingly approach the other end region 53a, as shown in Figure 3a.

[0079] Figure 4 shows, in the same viewing direction as Figures 2a and 3a, a third design of the plug valve 55, in which a valve body 52 can be axially displaced back and forth transversely to the direction of its passage 52A2, i.e. in the longitudinal direction, for opening and closing, here by means of a sliding drive 62 which acts on the left end face of the plug shaft 53 - which can have a rectangular or round cross-section.

[0080] The plug shaft 53 therefore preferably does not rest against an axial stop in any of the functional positions, but a sensor 61 detects in which of the two axial end positions - open position or closed position - the plug shaft 53 is currently located.

[0081] Here too, the valve body 52, which is made of elastic material, is to be kept under prestress in the axial direction in order to compensate for wear in the radial direction by the radial expansion caused thereby.

[0082] The preload can be generated in different ways: As shown in the enlargement in the lower half, the end part 53a connected to the sliding drive 62 has an axially projecting extension on the end face facing the valve body 52, which extension is designed as a threaded bolt and which runs past the passage channel 52A2 running transversely thereto.

[0083] It is irrelevant whether the threaded bolt is positioned centrally to the end part 53a and the passage channel 52A2 is eccentric, or whether the passage channel 52A2 is arranged centrally and such a threaded bolt extends next to it, for example on both sides thereof.

[0084] After threading on the valve body 52, which has a corresponding through-opening running in the axial direction for this purpose, an axially resilient element, for example a disc spring 64, and if necessary a sleeve-shaped end part 53b, is threaded onto the threaded bolt and then a clamping nut 63 is screwed on and tightened.

[0085] With increasing wear, the axially resilient element, such as the disc spring 64, expands from the illustrated flat state into a disc-shaped state, thereby exerting an approximately constant axial force on the valve body 52, which thereby bears radially tightly against the inner circumference 51 AA of the seat body 51.

[0086] In the axial region of the sleeve-shaped end part 53b, a seal or bearing can then be located opposite the seat part 51 in the assembled state, if desired.

[0087] In the upper half it is shown that there is a threaded hole in the end face of the other end part 53b facing the valve body 52, so that - again after threading on the valve body 52 and the resilient element - the end part 53b can be screwed onto the threaded bolt in order to apply an axial preload to the resilient element and thus to the valve body 52.

[0088] For this purpose, the threaded bolt and also the threaded hole should of course be centrally positioned so that, regardless of the rotational position when tightening, the two parts are aligned with each other and therefore the through-channel 52A2 must be eccentric so that the two do not touch each other.

[0089] The advantage is that this end part 53b can be designed to be as long as desired axially and thus - as in the overall view of Figure 4 - relatively far away in the

[0090] The seat body 51 can be supported—whereby the support must allow axial displacement of the plug shaft 53—and also includes flushing pockets between the seat surface 51A and the bearing points. Here, too, circumferential seals can be used simultaneously as plain bearings.

[0091] LIST OF REFERENCE SYMBOLS

[0092] 1 piston dosing device

[0093] 2 base body, seat body

[0094] 3 dosing cylinders

[0095] 4 dosing pistons

[0096] 5 Inlet line

[0097] 6 Outlet line

[0098] 7 Outlet opening

[0099] 12 Piston rod

[0100] 14 Inlet valve

[0101] 15 Exhaust valve

[0102] 17 storage containers

[0103] 18 Engine

[0104] 50 valve device

[0105] 51 seat body

[0106] 51 A Seat

[0107] 51 AA inner circumferential surface

[0108] 51 A1 estuary

[0109] 51 A2 Supply canal, extension canal

[0110] 51.1 Seat body

[0111] 52 plugs, valve bodies

[0112] 52a, b end area

[0113] 52' swivel axis, axial direction

[0114] 52A sealing surface

[0115] 52AA outer peripheral surface

[0116] 52A1 Mouth

[0117] 52A2 Passage channel, cross bore

[0118] 53 Plug shaft 53A, B Marking 53a, b Side, end 54 Rotary actuator, pneumatic cylinder 55 Plug valve 56 Preload element

[0119] 57 Flushing pocket 58a — c Seal 59 Flange

[0120] 60 Angle sensor 61 Wear sensor

[0121] 62a, b clamping screw 63 clamping nut

[0122] 64 Disc spring M material

Claims

PATENT CLAIMS 1. Dosing device, in particular for dosing viscous materials and, if necessary, simultaneous mixing of several components in the form of viscous materials, with one dosing device (1) per component, wherein - an inlet line (5) from the storage container (17) and an outlet line (6) open into the dosing cavity, - a valve device (50) with an inlet valve (15) is provided in each inlet line (5) and - a valve device (50) with an outlet valve (16) is provided in each outlet line (6), characterized in that - at least one of the valves (15, 16) is designed as a plug valve (55) with a valve body (52) as a closing element in a seat body (51), - a passage channel (52A2) for the material through the valve body (52) extends in a transverse direction to its axial direction through the valve body (52), - wherein the valve body (52) is rotatable about the axial direction or displaceable in the axial direction transverse to this transverse direction. (Piston dosing device:) 2. Dosing device according to claim 1, characterized in that - the dosing device (1 ) is a piston dosing device (1 ), - with a dosing cylinder (3) in which a dosing piston (4) is displaceable via a piston rod (12) or a plunger driven by a motor (18). (Material pairing:) 3. Dosing device according to one of the preceding claims, characterized in that - the seat surface (51 A) of the valve seat is made of a harder material, in particular of hardened metal, than the sealing surface (52 A) of the valve body (52) adjoining it, - in particular the sealing surface (52A) adjacent to the seat surface (51A) of the valve seat, in particular the entire inner peripheral surface (52AA) of the valve body (52) consists of a plastic, in particular of HPU, PTFE or polyethylene.

4. Dosing device according to one of the preceding claims, characterized in that the material of at least the sealing surface (52A), in particular the entire outer circumferential surface (52AA), of the valve body (52) has a Shore hardness of at most 96, in particular at most 70, in particular at most 55 and / or a tensile strength of at most 60 MPa, in particular at most 50 MPa and / or an elongation at break of at least 350%, in particular at least 400%. (Trunked cone, rotatable:) 5. Dosing device according to one of the preceding claims, characterized in that in the case of a rotatable valve body (52) - the plug valve (55) has a truncated cone-shaped valve body (52), - in particular the cone angle (a) of the truncated cone to the axial direction (52') is at least 10°, better at least 20°, better at least 30°.

6. Dosing device according to one of the preceding claims, characterized in that the valve body (52) is prestressed in the axial direction (52') into the valve seat, in particular the inner circumferential surface (51 AA). (rotatable or movable :) 7. Dosing device according to one of claims 1 - 4, characterized in that - in the case of a rotatable valve body (52), the plug valve (55) has a cylindrical outer peripheral surface (52AA) and the base body (51) has a cylindrical inner peripheral surface (51 AA), - in the case of an axially displaceable valve body (52), the plug valve (55) has any desired cross-sectional shape and the seat body (51) has an analogous cross-sectional shape. (Valve body elastic:) 8. Dosing device according to one of the preceding claims, characterized in that - on the side of the valve body (52), the material of at least the sealing surface (52A) is so soft and elastic that an increase in the diameter of the outer peripheral surface (52AA) of the valve body (52) in the axial region of its orifices (52A1) can be achieved by axial compression of the valve body (52). (Basic structure:) 9. Dosing device according to one of the preceding claims, characterized in that - the valve body (52) is an axial section of a plug shaft (53) rotatable about the axial direction (52'), which in particular protrudes from the seat body (51) of the plug valve (55) on both sides.

10. Dosing device according to one of the preceding claims, characterized in that - the valve body (52) including its peripheral surface (52AA) consists of the same material, in particular plastic, and is connected to the two end parts (53a, b) of the plug shaft (53) in a rotationally fixed and / or axially fixed manner, in particular is detachably connected. - in particular the valve body (52) can be subjected to axial force between the two ends (53a, b), - either by axially clamping the two ends (53a, b) against each other or by axially bearing one end against a stop, in particular an axial bearing, and applying axial force to the other end. (Drive / Bearing:) 11. Dosing device according to one of the preceding claims, characterized in that the plug shaft (53) is operatively connected to a pivoting drive (54) or a sliding drive (62), - on the preload side (53a) is only radially mounted in a circumferentially surrounding elastic seal (58) and / or - on the side (53b) facing away from the axial preload, it is supported by roller bearings at least in the radial direction, in particular also in the axial direction. (Sensory:) 12. Dosing device according to one of the preceding claims, characterized in that - a rotation angle monitoring and / or an axial position monitoring of the valve body (52), in particular of the entire plug shaft (53), is provided, - in particular in the form of a flange (59) projecting radially beyond the plug shaft (53) and an angle sensor (60) which monitors the rotational position about the axial direction (52'), in particular in a contactless manner and which can monitor at least the end positions of the plug shaft (53), in particular of the flange (59). (Dishwashing bags:) 13. Dosing device according to one of the preceding claims, characterized in that - at least one flushing pocket (57) connected to a flushing circuit is provided at the parking position of the mouth (52A1) at a distance in the circumferential direction from the seat surface (51A) in the inner circumferential surface (51AA) of the seat body (51) facing the valve body (52).

14. Dosing device according to one of the preceding claims, characterized in that - in the axial direction (52') at a distance from the seat surface (51 A), preferably on both sides, in the inner circumferential surface (51 AA) of the base body (51) facing the valve body (52), at least one flushing pocket (57) connected to a flushing circuit is provided.

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