EP3029320A1 - Pump device and method for conveying viscous fluids, in particular adhesives - Google Patents

Abstract

A pump device (1, 1a) and a method for conveying viscous media, in particular adhesives, are disclosed. The pump device (1, 1 a) has a cylinder unit (20) and a piston unit (22) accommodated at least in sections by the cylinder unit (20), which together form a conveyor (2) operating on the reciprocating piston principle. Furthermore, the pump device (1, 1a) has at least one drive shaft (7), which is connected to a motor and via which the cylinder unit (20) and the piston unit (22) are rotatably movable about a common axis and one with the conveyor (2). positive guidance in mechanical coupling, by means of which, for pumping the respective viscous medium, the rotary movement of the conveyor (2) can be converted into an alternating lifting and return stroke movement of the piston unit (22).

Description

The present invention relates to a pumping device and a method for conveying highly viscous or viscous media, in particular adhesives.

Devices or methods of the type mentioned can be used, for example, to promote hot glue from a storage store and provide for a labeling process. Known here are devices that can be placed on a container and perform the glue via appropriate line connections a Beleimungswalze and / or other facilities.

A heatable pump for viscous media is for example from the DE 35 42 848 A1 known. The disclosed there pump has a piston rod, a pump piston and a concentrically arranged to the piston rod riser. A radiator is helically guided around the piston rod. By means of a linear drive, a pump piston is moved up and down to convey glue.

Such devices are complicated in the technical implementation, since they require a complex mechanism for generating a linear movement of the pump piston. Also, in the devices known from the prior art, a regular and frequent maintenance necessary to prevent a defect of the pump can. If, for example, hot glue is to be made available for a labeling process by means of such pumps, the pumps must be replaced during maintenance or repair, whereby the labeling process must be interrupted. For a labeling device or for a labeling process, therefore, pump devices would be desirable which are subject to the least possible signs of wear and are also easy to maintain.

The object of the invention is therefore to provide a pumping device and a labeling device with such a pumping device, which are characterized by a simple structure and a low-maintenance operation. It is another object of the present invention to provide a method for the delivery of viscous medium, which can be implemented easily and with no or minor complications.

The above objects are achieved by a pumping apparatus, a method and a labeling apparatus comprising the features in claims 1, 9 and 10. Further advantageous embodiments are described by the subclaims.

The pumping device according to the invention is intended for conveying highly viscous or viscous media, in particular adhesives. For example, preferred embodiments of the present invention may be provided for the promotion of cold glue, in particular casein glue or solutions of adhesives. It is also conceivable that hot glue and / or other glues are conveyed by means of the pump device according to the invention. Processing temperatures of about 15 to 36 ° C are suitable for the preferably to be conveyed cold glues, wherein a reasonable viscosity range at about 20,000 to 200,000 [mPa · s] can be at a temperature of about 20 ° C.

The pump device comprises a cylinder unit and a piston unit accommodated at least in sections by the cylinder unit, which together form a conveying device operating on the reciprocating piston principle. The cylinder unit is mounted here on the piston unit. The piston unit is driven in rotation while the cylinder unit is taken from the piston and set in rotation by this.

Furthermore, the pump device according to the invention comprises at least one drive shaft which is connected to a motor and via which the cylinder unit and the piston unit are rotatably movable about a common axis. The drive shaft may have a vertical orientation during operation of the pumping device. To drive the drive shaft in rotation, the motor may be formed, for example, as a geared motor and in particular as an electric motor. Other drive variants are also conceivable, for example hydraulic drives or the like. Such motors have lower maintenance costs and lower signs of wear than the linear drives used in known pump devices. The engine and the drive shaft may be interposed between a corresponding clutch.

Also, there is provided a positive guide in mechanical coupling with the conveyor, by means of which the rotary movement of the conveyor is converted into an alternating lifting and return stroke movement of the cylinder unit for pumping the respective viscous medium. As the piston unit at least is received in sections by the cylinder unit, rotate the piston unit and the cylinder unit with the same rotational frequency. In particular, it may be that the rotational frequencies of the drive shaft and the conveyor are the same. It is also conceivable that the positive guide leads the conveyor such that the cylinder unit performs a stroke movement and a return stroke during a complete revolution of the conveyor.

The lifting and return stroke movement of the cylinder unit takes place in each case by a movement in which the cylinder unit and the piston unit are adjusted relative to one another. It is conceivable here that the relative movement is effected by an active adjustment of the piston unit, but also that the relative movement is effected via an active adjustment of the cylinder unit.

It may be that, as described in more detail below, the piston unit is firmly connected to the drive shaft in connection or is mechanically coupled directly to the drive shaft. In addition, the cylinder unit may be coupled to the positive guide or be in operative connection with the positive guide and be adjusted relative to the piston unit with rotating movement of the conveyor. The invention is not limited to such embodiments, so that the person skilled in the further possibilities are available to effect a relative movement of a piston unit and a cylinder unit by means of positive guidance.

Furthermore, the piston unit may be guided in the cylinder along an oriented at least approximately perpendicular to the axis of rotation of the drive shaft direction. The conveyor may thus have a horizontal orientation during operation of the pumping device or be disposed horizontally in a storage container for the adhesive. Thus, the longitudinal axes of the cylinder unit and / or the piston unit can be oriented perpendicular to the axis of rotation of the drive shaft. An axis along which the lifting movement and the return stroke movement of the cylinder unit can thus be oriented perpendicular to the axis of rotation of the drive shaft.

In particularly preferred embodiments, the cylinder unit of the conveyor has an inlet oriented at least approximately perpendicular to the axis of rotation of the drive shaft or a plurality of at least approximately perpendicular to the axis of rotation of the drive shaft oriented inlets for the highly viscous or viscous medium to be promoted. In conceivable embodiments, it may be that the cylinder unit has exactly one inlet, over which viscous Medium or adhesive in a return stroke movement of the piston unit enters the cylinder unit. The viscous medium can be sucked in here due to the return stroke by the conveyor. As the conveyor rotates, the inlet may rotate around the drive shaft.

In further conceivable embodiments, the cylinder unit may have on opposite sides at least two inlets for the highly viscous or viscous medium, which are each oriented at least approximately perpendicular to the axis of rotation of the drive shaft and aligned with each other. If the cylinder unit has at least two such inlets, these can rotate together with the moving movement of the conveyor together about the drive shaft. The piston unit may then preferably be fully received in the cylinder unit and alternately reciprocate between the at least two inlets. The alternating movement of the piston unit can be further effected by a mechanical coupling of the cylinder unit to the forced operation. Thus, the cylinder unit can be actively adjusted, thereby causing the lifting and Rückhubbewegung the piston unit, whereas the piston unit remains firmly connected to the drive shaft.

The pumping device may also have one or more valves or check valves. The one or more valves may be formed, for example, as ball valves. In particular, at least one valve may be associated with the one or more inlets, and at least one further valve may be associated with one or more outlets of the conveyor. In this case, the valves associated with the one or more inlets can close during a stroke movement of the piston unit or during a compression of the viscous medium and open during a return stroke movement of the piston unit or during suction of the viscous medium.

Furthermore, the valves assigned to one or more outlets can open during a stroke movement of the piston unit or during a compression of the viscous medium and close during a return stroke movement of the piston unit or during an aspiration of the viscous medium.

As previously mentioned, it may be that the drive shaft rotatably connected to the piston unit of the conveyor in communication. In particular, have themselves Such embodiments are proven when the drive shaft at least partially provides a channel for transporting the viscous medium, which is in fluid communication with the piston unit. Via the channel, the drive shaft can supply the viscous medium to an annular chamber in which annular chamber one or more heating media, such as spiral heating spirals or the like, are arranged in order to temper the viscous medium. The helical heating coils can be guided at least in sections around the drive shaft. The drive shaft may have an opening through which the viscous medium enters the annular channel. The annular channel may be formed between a delivery housing of the pumping device and the drive shaft, wherein the delivery housing receives the drive shaft at least in sections.

Further, the pumping device may comprise at least one connecting rod mechanically coupled to the conveyor, which communicates with an eccentrically acting adjusting mechanism. The connecting rod unit may be oriented parallel to the conveyor, wherein the connecting rod unit maintains its parallel orientation to the conveyor during a rotary movement of the conveyor.

The eccentric adjustment mechanism can provide storage for the connecting rod unit. In particular, the eccentrically acting adjustment mechanism itself may be formed as a stationary component of the pumping device. With eccentric adjusting movement of the connecting rod unit, this can be moved relative to the adjusting mechanism or rotate eccentrically about the adjusting mechanism. The eccentrically acting adjusting mechanism can be immovably connected to a housing portion of the pumping device. Furthermore, the drive shaft can pass through the eccentrically acting adjusting mechanism and, if appropriate, be connected to the conveying device at its free end pointing downwards or mechanically coupled to the conveying device.

In particular, the connecting rod unit may be formed as a disc which is in mechanical coupling with the conveyor. A broad side surface of the disc may face the conveyor, a further opposite broad side surface of the disc may be facing away from the conveyor. In a conceivable embodiment, the disk or the connecting rod unit can be moved via the drive shaft in a rotating manner and preferably at the same rotational frequency as the conveying device.

In particularly preferred embodiments, there is no direct mechanical connection between the drive shaft and the conveyor. For example, it may be that the connecting rod unit is mechanically coupled to the conveyor and a rotary movement of the connecting rod unit is transmitted from the conveyor via the mechanical coupling to the connecting rod unit. By connecting the connecting rod unit with the eccentric adjusting mechanism and the mechanical coupling of the connecting rod to the conveyor can be effected with rotating movement of the conveyor and the connecting rod, the lifting movement and the return stroke of the piston unit. It is also possible to mechanically couple the connecting rod unit to the drive shaft, so that the connecting rod unit is moved in rotation via the drive shaft. Upon rotation of the connecting rod unit, the eccentrically acting adjusting mechanism can cause a radial displacement of the connecting rod unit and thus a lifting movement and a return stroke movement of the piston unit.

In particular, it may be the case that the piston unit and the connecting rod unit are mechanically coupled directly to one another via a spigot connection. The pin joint may engage the connecting rod unit and guide the connecting rod unit with the conveyor when the conveyor is rotating. The spigot connection may have a parallel orientation to the drive shaft.

During operation of the pumping device, it may be that a torque is transmitted to the entire pumping device via the conveying device or via the rotating cylinder unit. In order to reduce this moment and to continue to ensure a stable storage during operation of the pumping device, it may be that the pumping device has at least one preferably all around the conveyor guided housing, which is immovably mounted and on its upper and / or lower side has at least one opening. For example, the housing for immovable storage with the eccentric adjusting mechanism and / or with a fixed portion or component of the pumping device may be mechanically fixed. In particularly preferred embodiments, an upper side and / or a lower side of the housing is designed to be completely open. Thus, the housing may be formed as an open on its upper side and its lower side hollow cylinder, which is guided around the conveyor or receives the conveyor.

Since during operation of the pumping device, its conveyor is mounted in the viscous medium or adhesive, the viscous medium or the glue can serve as a lubricant for moving parts of the conveyor. The wear is thereby further reduced.

To further reduce the torque, the pumping device may have one or more webs and / or blades, which in particular extend radially in the direction away from the drive shaft. Also, the webs and / or blades may be immovably mounted and this may be mechanically connected to the eccentric adjustment mechanism and / or with a fixed lot or component of the pumping device, if necessary.

The present invention also includes a labeling device. The labeling device according to the invention is provided for applying labels to objects such as beverage containers or the like. For this purpose, the labeling device comprises an application unit for adhesive, which application unit is coupled via fluidic line connections to a previously described pumping device. The application unit may be formed, for example, as a glue roller or the like. The objects can be designed, for example, as beverage containers.

The present invention further relates to a method for conveying viscous media. Features that were previously described for the pumping device or the labeling device can also be provided in conceivable embodiments of the method according to the invention. Furthermore, features that are described below for various embodiments of the method according to the invention may be present in conceivable embodiments of the pumping device or labeling device according to the invention.

The method is suitable for conveying viscous media and in particular of adhesives or glues. In the method according to the invention, a cylinder unit and a piston unit accommodated at least in sections in the cylinder unit form a conveying device for the viscous medium. The conveyor or the cylinder unit and the piston unit are rotated via a drive shaft about a common axis. With the conveyor a positive guide is mechanically coupled, which from the rotating movement an alternating lifting and return stroke of the piston unit on the conveyor transfers. As part of the lifting and Rückhubbewegung the cylinder unit and the piston unit are moved relative to each other.

In particularly preferred embodiments, the positive guidance causes in the course of a complete rotation of the conveyor by 360 ° at least one stroke and at least one return stroke of the piston unit.

Furthermore, the drive shaft can be connected in a rotationally fixed manner to the piston unit and the cylinder unit can be taken along by the piston unit when the drive shaft rotates. In this case, the drive shaft can be coupled directly to the piston unit.

It is also conceivable that the lifting and Rückhubbewegung the piston unit is effected via a connecting rod, which is moved eccentrically via an adjusting mechanism and has a mechanical coupling to the conveyor. The lifting movement and the return stroke movement can thus result from an eccentric adjustment of the connecting rod unit with rotating movement of the conveyor.

It is also conceivable that the connecting rod unit is acted upon by its mechanical connection to the conveyor with a torque and as a result experiences an eccentric rotational movement. The connecting rod unit can thus be moved in its rotation with the same rotational frequency as the conveyor and / or the drive shaft. Thus, torque can be transmitted from the drive shaft via the conveyor to the connecting rod unit.

Furthermore, the lifting movement and the return stroke movement of the piston unit can be effected with the aid of a journal or a journal connection, which mechanically couples the cylinder unit and the connecting rod unit. Via the bearing pin, a torque can be transmitted from the conveyor to the connecting rod unit.

In particular, it may be that the conveyor is rotated about an at least approximately vertically oriented axis. The lifting movement and the return stroke movement can thus run in the horizontal direction or at least approximately in the horizontal direction.

The promotion of the viscous medium may be provided in an appropriate connection for a labeling process. So it is conceivable that the viscous medium is conveyed in the direction of an application unit of a labeling and the objects are applied via the application unit with the viscous medium.

• Figur 1 zeigt einen schematischen und perspektivischen Längsschnitt einer Ausführungsform einer erfindungsgemäßen Pumpvorrichtung;
• Figur 2 zeigt eine Detailansicht einer unteren Partie des Ausführungsbeispiels einer Pumpvorrichtung aus Figur 1;
• Figur 3 zeigt eine weitere Detailansicht einer unteren Partie des Ausführungsbeispiels einer Pumpvorrichtung aus den Figuren 1 und 2;
• Figur 4 zeigt eine schematische Perspektivansicht einer weiteren Ausführungsform einer erfindungsgemäßen Pumpvorrichtung;
• Figur 5 zeigt eine Detailansicht einer unteren Partie des Ausführungsbeispiels einer Pumpvorrichtung aus Figur 4.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

• FIG. 1 shows a schematic and perspective longitudinal section of an embodiment of a pump device according to the invention;
• FIG. 2 shows a detailed view of a lower portion of the embodiment of a pumping device FIG. 1 ;
• FIG. 3 shows a further detailed view of a lower portion of the embodiment of a pumping device of the FIGS. 1 and 2 ;
• FIG. 4 shows a schematic perspective view of another embodiment of a pump device according to the invention;
• FIG. 5 shows a detailed view of a lower portion of the embodiment of a pumping device FIG. 4 ,

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are merely examples of how the device or method of the invention may be configured and are not an exhaustive limitation.

FIG. 1 shows a schematic and perspective longitudinal section of an embodiment of a pump device according to the invention 1. The pump device 1 has a bearing housing 5, which for receiving a in FIG. 1 not shown coupling 55 (see. FIG. 4 ) is trained. On the bearing housing 5, for example, an electric motor or another drive motor such as a mechanical drive connection or a hydraulically operating motor o. The like. Placed or flanged, which drives the drive shaft 7 rotating. An exemplary embodiment of an electric motor 50 is in the embodiment of FIG. 4 shown and can be used in the same or equivalent manner also for the embodiment, which in the FIGS. 1 to 3 is illustrated.

Next, the pump device 1 has a pump cover 3. The pump cover 3 is before commissioning of the pumping device 1 to a in FIG. 1 not shown storage container for adhesive or glue and closes the storage container from the top down. The storage container, not shown here, may normally be designed as a pot or barrel o. The like., In the interior of the pumping device 1 dips with its length to promote the highly viscous medium therein, in particular the glue or adhesive up to an outlet 15, which may be connected to a hose line or other delivery line (not shown).

Another component of the pumping device 1 is designated by the reference numeral 10 and in FIG. 1 conveying housing exemplified, which provides an annular channel formed between the drive shaft 7 and the inner circumferential surface of the conveyor housing 10 for transporting the viscous or highly viscous medium or the adhesive and the drive shaft 7 at least partially accommodates coaxially enveloping.

The drive shaft 7 is normally oriented approximately concentrically to the hollow cylindrical conveyor housing 10 and can thus rotate in the conveyor housing 10 in the manner shown. In addition, a heating coil 9 can be seen, which is guided helically around the drive shaft 7 and thus within the annular channel and is completely received by the conveyor housing 10. The heating coil 9 causes, as needed, a heating of the along the conveyor housing 10 and along the annular channel in the upward direction transported adhesive or transported therein high-viscosity medium.

The conveyor housing 10 or the annular channel formed between the drive shaft 7 and the inner lateral surface of the conveyor housing 10 opens at the top into a pipe socket 15, so that the glue or adhesive heated by the heating coil 9 is pumped from the annular channel into the pipe socket 15. The pipe socket 15 is preferably coupled to a gluing unit or an application unit for glue or the like. Application device (not shown). The pumping device 1 can thus be formed as part of a labeling and a job unit of Labeling device Apply adhesive in controllable quantity. Via an opening 32 of the pipe socket 15 is guided through the pump cover 3.

As can be seen in the lower part of the pumping device 1, the drive shaft 7 is fixed at its downwardly pointing end with a horizontal piston unit 22 in connection. The drive shaft 7 is in this case directly and non-rotatably coupled to the piston unit 22. If the drive shaft 7 is rotated, then the piston unit 22 is rotated together with the drive shaft 7. The drive shaft 7 and piston unit 22 rotate synchronously due to the direct mechanical connection.

In addition, a cylinder unit 20 is shown, which form together with the piston unit 22 a working on the Hubkolbenprinzip conveyor 2 for the adhesive. The transport or the promotion of the adhesive takes place here by a relative movement of the cylinder unit 20 and the piston unit 22 according to the reciprocating piston principle. The direction of the lifting movement and the return stroke movement between the piston unit 22 and the cylinder unit 20 are each oriented perpendicular to the axis of rotation of the drive shaft 7 due to the arrangement of the piston unit 22 and the associated cylinder unit 20.

At the same time, the piston unit 22 supplies a linear guide for the cylinder unit 20, so that the cylinder unit 20 can execute its lifting movement as well as its return stroke movement in the linear direction. A direct mechanical coupling between the drive shaft 7 and the cylinder unit 20 is not present. Thus, the cylinder unit 20 is carried along for its rotational movement of the piston unit 22 and thereby applied via the piston unit 22 with a torque.

In order to effect suction and conveying of the adhesive during stroke movement and return movement of the cylinder unit 20, two ball valves 24 and 26 are presently provided. The function of the two ball valves 24 and 26 is in this case such that during a return movement of the piston unit 22 and the cylinder unit 20, the valve 24 positioned in the region of the inlet 23 opens, so that adhesive is sucked into the cylinder unit 20 through the inlet 23. At the same time, the valve 26 closes, so that a negative pressure in the cylinder unit 20 is built up to suck in the adhesive. The inlet 23 for the adhesive is introduced into the cylinder unit 20 perpendicular to the axis of rotation of the drive shaft 7. Vice versa closes on a return stroke of the piston unit 20 arranged in the region of the inlet 23 valve 24, whereas the other valve 26 opens.

The drive shaft 7 has a channel 36, which is in fluid communication with the conveyor 2 and which opens into the conveyor 2. Since, by means of the return stroke movement of the piston unit 20, the adhesive sucked in through the inlet 23 and located in the interior of the cylinder unit 20 is compressed and an overpressure arises in the conveyor 2, the adhesive is transported from the conveyor 2 into the channel 36 of the drive shaft 7 ,

The channel 36 has an opening 41, via which the adhesive is guided into the annular space of the conveyor housing 10. From the annular space or from the conveyor housing 10, the adhesive is then further - as previously described - transported or pumped into the pipe socket 15.

In the in FIG. 1 shown position, the cylinder unit 20 has already carried out a return stroke, so that now adhesive is received in the conveyor 2 and the inlet 23 is closed by the ball valve 24. Further, a connecting rod 19 can be seen, which is mechanically coupled to the cylinder unit 20 via a bearing pin 17.

The connecting rod unit 19 is connected to an eccentrically acting adjusting device 30 and is mounted vertically immovable by the adjusting device 30. Due to the mechanical connection of the conveyor 2 via the bearing pin 17 with the connecting rod unit 19, the connecting rod unit 19 is guided with rotating movement of the conveyor 2 together with the conveyor 2 and acted upon by the conveyor 2 with a torque. About the adjusting device 30, the connecting rod unit 19 is offset eccentrically in its rotating movement and in this case leads the cylinder unit 20 of the conveyor 2 with it. The associated radial offset of the bearing pin 17 to the axis of rotation of the drive shaft 7 causes an adjustment of the cylinder unit 20 in the radial direction and thus the lifting movement and the return stroke of the piston unit 22nd

FIG. 1 indicates here that the lifting movement and the return stroke movement of the piston unit 22 by a rotation axis of the drive shaft 7 radial adjustment of the cylinder unit 20 is effected while the piston unit 22 is rotatably connected to the drive shaft 7 and undergoes no radial offset.

The connecting rod 19 is also formed as a disc and rotates during its rotational movement relative to the adjusting mechanism 30 which is immovably and fixedly connected to the conveyor housing 10.

Another component of the pumping device 1 is a housing 33 accommodating the conveying device 2, which housing is designed to be open as a hollow cylinder and on its upper side and on its lower side. As a result, adhesive can pass through the housing 33 and be received and transported by the conveyor 2. Since the rotating movement of the conveyor 2 with eccentric displacement of the cylinder unit 20 takes place under contact with adhesive acts during operation, a moment on the entire pumping device 1. Advantageously, by means of the housing 33, the torque acting on the pumping device 1 can be reduced or supported. The housing 33 is in this case designed as an immovable sleeve 34 and is fixedly connected to a stationary component or a fixed portion of the pumping device 1.

As an alternative or in addition to the housing 33 or the sleeve 34, the pump device 1 may have one or more webs and / or blades projecting radially away from the drive shaft 7 and designed as stationary components of the pump device 1, which reduce the moment acting on the pump device 1. For reasons of clarity, the webs or blades are not shown in the figures of this patent application.

FIG. 2 shows a detailed view of a lower portion of the embodiment of a pumping device 1 from FIG. 1 , Good to see here is again the direct and non-rotatable connection between the drive shaft 7 and the piston unit 22. With rotating movement of the drive shaft 7 rotate the drive shaft 7 and the piston unit 22 with the same rotational frequency.

Also leaves the schematic and perspective longitudinal section of FIG. 2 recognize again very well that neither the connecting rod unit 19 nor the cylinder unit 20 are in direct mechanical connection with the drive shaft 7. A torque is thus transmitted from the drive shaft 7 to the piston unit 22, wherein the cylinder unit 20 is taken by the piston unit 22 in its rotary movement. By means of the journal connection or the bearing pin 17, the connecting rod unit 19 is acted upon by the conveyor 2 or by the cylinder unit 20 with a torque, so that the conveyor 2 and connecting rod unit 19 rotate at the same rotational frequency.

The adjusting device 30 causes, as previously mentioned, a radial offset of the connecting rod unit 19, the bearing pin 17 and the cylinder unit 20th during her rotating movement. Here, the connecting rod unit 19, the bearing pin 17 and the cylinder unit 20 rotate relative to the adjusting mechanism 30, wherein the adjusting mechanism 30 is fixedly connected to the immovable conveyor housing 10 of the pumping device 1. Since the piston unit 22 is fixedly coupled to the drive shaft 7, the radial displacement of the cylinder unit 20 during rotational movement of the conveyor 2, the lifting movement and the return stroke of the piston unit 22 in the cylinder unit 20 causes.

FIG. 3 shows a further detailed view of a lower portion of the embodiment of a pumping device 1 of the FIGS. 1 and 2 , Again shown is the inlet 23 of the cylinder unit 20, which can be opened and closed in operative connection with the ball valve 24. The bearing pin 17 is presently formed as an integral part of the cylinder unit 20, but may be formed in other conceivable embodiments as a separate component or as an integral part of the connecting rod 19.

In addition, shows FIG. 3 Again, a firm connection between the housing 33 and the sleeve 34 and the eccentric adjusting mechanism 30. Since the eccentric adjusting mechanism 30 is in communication with the stationary conveyor housing 10, the eccentrically acting adjusting mechanism 30 and the housing 33 and the sleeve 34th formed as immovable part of the pumping device 1. In addition, the conveyor housing 10 is placed on the adjusting mechanism 30, wherein the adjusting mechanism 30 is partially inserted into the conveyor housing 10.

FIG. 4 shows a schematic perspective view of another embodiment of a pump device 1 a according to the invention. The pumping device 1 a according to embodiment of the FIGS. 4 and 5 has on opposite sides of the cylinder unit 20 each have an inlet 23 and 25 for adhesive, wherein the inlets 23 and 25 are aligned perpendicular to the axis of rotation of the drive shaft 7 with each other.

The other components of the pump device 1a, which are not formed as part of the conveyor 2, have an identical structure according to the pumping device 1 of the previous embodiment of FIGS. 1 to 3 so that the individual components are not dealt with repeatedly.

The piston unit 22, which in the embodiment of the FIGS. 4 and 5 is completely absorbed in the cylinder unit 20, between the two Inlets 23 and 25 with rotating movement of the conveyor 2 moves back and forth. For this purpose, the bearing pin 17, which is formed as an integral part of the cylinder unit 20, engages in the connecting rod unit 19. Upon rotation of the cylinder unit 20, the connecting rod unit 19 is moved in rotation with the conveyor 2 and caused due to the mechanical connection between the connecting rod unit 19 and the cylinder unit 20 via the bearing pin 17, a radial displacement of the cylinder unit 20 with rotating movement of the conveyor second

The first inlet 23 is associated with the first ball valve 24, while the second inlet 25 is associated with the second ball valve 24 '. In the course of a complete revolution of the conveyor 2, the ball valves 24 and 24 'are alternately opened and closed, so that depending on the respective position of the piston unit 22, either adhesive is sucked in via the first inlet 23 or via the second inlet 25. In a partial region of the cylinder unit 20, a compression of adhesive takes place continuously over the course of time, whereas in a further partial region and depending on the position or direction of movement of the piston unit 22, adhesive is sucked in via the inlet 23 or 25.

With embodiments according to the example of the FIGS. 4 and 5 can promote high throughput rates of adhesive per unit time, the pumping device 1a can also be operated wear.

FIG. 5 shows a detailed view of a lower portion of the embodiment of a pumping device 1a FIG. 4 , With are shown again already in FIG. 4 shown ball valves 26 and 26 '. Depending on the relative position of the piston unit 22 in the cylinder unit 20 or in dependence on the rotational position of the conveyor 2 is always one of the two ball valves 26 or 26 'open, whereas the other of the two ball valves 26 and 26' is closed. Also in the embodiment according to the FIGS. 4 and 5 When the adhesive or glue in the conveyor 2 is compressed, the adhesive or glue can pass the opened ball valve 26 or 26 'and from the piston unit 22 into the channel 36 the drive shaft 7 occur. From the channel 36, the adhesive or glue then passes via the opening 41 in the annular space of the conveyor housing 10, is tempered there and then via the pipe socket 15 (see. FIG. 4 ) fed in the direction of a downstream application unit of a labeling device.

The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1

pumping device

2

Conveyor

3

pump cover

5

bearing housing

7

drive shaft

9

heating coil

10

conveyor housing

15

pipe socket

17

pivot

19

connecting rod

20

cylinder unit

21

breakthrough

22

piston unit

23

inlet

24

ball valve

25

inlet

26

ball valve

30

adjustment

32

opening

33

casing

34

cuff

36

channel

41

breakthrough

50

electric motor

55

clutch

Claims (15)

Pumping device (1, 1a) for conveying highly viscous or viscous media, in particular of adhesives, comprising a cylinder unit (20) and a piston unit (22) accommodated at least in sections by the cylinder unit (20), which together form a conveyor device (2) operating according to the reciprocating piston principle, - At least one with a motor (50) in communication drive shaft (7) via which the cylinder unit (20) and the piston unit (22) are rotatably movable about a common axis, and a positive guide in mechanical coupling with the conveying device (2) which converts the rotary movement of the conveying device (2) into an alternating lifting and return stroke movement of the piston unit (22) for pumping the respective viscous medium, wherein the piston unit (22) and the connecting rod unit (19) are mechanically coupled to each other directly via a pin connection (17),
and wherein the lifting and Rückhubbewegungen the piston unit (22) via a connecting rod (19) is effected, which is eccentrically movable via an adjusting mechanism (30) and has a mechanical coupling to the conveyor (2). Pumping device according to Claim 1, in which the piston unit (22) in the cylinder unit (20) is guided along a direction oriented at least approximately perpendicular to the axis of rotation of the drive shaft (7). Pumping device according to claim 1 or claim 2, wherein the cylinder unit (20) of the conveyor (2) has one or more at least approximately perpendicular to the axis of rotation of the drive shaft (7) oriented inlet (23, 25) for the viscous medium. Pumping device according to one or more of claims 1 to 3, wherein the drive shaft (7) rotatably with the piston unit (22) of the conveyor (2) is in communication. Pumping device according to one or more of claims 1 to 4, wherein the drive shaft (7) at least partially provides a channel (36) for transporting the viscous medium, which is in fluid communication with the piston unit (22). Pump device according to one or more of claims 1 to 5, comprising at least one of the conveyor (2) mechanically coupled Pleueleinheit (19), which is for the lifting and Rückhubbewegung the piston unit (22) with an eccentrically acting adjusting mechanism (30) , Pumping device according to one or more of claims 1 to 6, comprising at least one preferably all around the conveyor guided housing (33) which is immovably mounted and has at least one opening on its upper and / or lower side. Labeling device for applying labels to objects such as beverage containers or the like, comprising at least one application unit for adhesive, which application unit is coupled via fluidic line connections to a pumping device (1, 1a) according to one or more of claims 1 to 7. Method for conveying highly viscous or viscous media, in particular adhesives, in which a cylinder unit (20) and a piston unit (22) accommodated at least in sections in the cylinder unit (20) form a conveyor (2) and via a drive shaft (7) a common axis are rotated, wherein with the conveyor (2) a positive guide is mechanically coupled, which transmits an alternating lifting and return stroke of the piston unit (22) on the conveyor (2) from the rotating movement. The method of claim 9, wherein the positive guidance in the course of a complete rotation of the conveyor (2) by 360 ° causes at least one lifting movement and at least one return stroke movement of the piston unit (22). The method of claim 9 or 10, wherein the drive shaft (7) rotatably connected to the piston unit (22) is in communication and the cylinder unit (20) with rotating movement of the drive shaft (7) of the piston unit (22) is entrained. Method according to one or more of Claims 9 to 11, in which the stroke and return movement of the piston unit (22) is effected via a connecting rod unit (19) which is eccentrically moved by means of an adjusting mechanism (30) and a mechanical coupling to the conveying device (2 ) owns. Method according to Claim 12, in which the lifting movement and the return movement of the piston unit (22) are effected with the aid of a journal connection (17) which mechanically couples the cylinder unit (20) and the connecting rod unit (19). Method according to one or more of claims 9 to 13, wherein the conveyor (2) is rotated about an at least approximately vertically oriented axis. Method according to one or more of claims 9 to 14, wherein the viscous medium is conveyed in the direction of an application unit of a labeling and objects are applied via the application unit with the viscous medium.

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