DE9417665U1 - Device for processing and dispensing at least two pasty components - Google Patents

Description

Description: Wegener GmbH, Vaalser Str. 81, D-52074 Aachen

Device for processing and dispensing at least two pasty components

The invention relates to a device for processing and dispensing at least two pasty components, which are pre-portioned separately in containers, with storage cylinders, in each of which a container can be placed in receiving spaces between a head plate and an ejection piston, the ejection pistons being movable in the direction of the head plates by means of an ejection drive and the head plates having outlet openings which continue in outflow channels, which open into a mixing device for mixing the components, which is connected to a mixing drive.

Such a device is disclosed in EP-A-0 603 492. It has two storage cylinders arranged next to one another, in which ejection pistons are slidably guided. The storage cylinders end in head plates, which are combined to form a one-piece head plate. The head plates have outlet openings with adjoining outflow channels, which open into a mixing device.

The storage cylinders are used to hold containers, for example cartridges, in which the components are pre-portioned. With the help of the ejection pistons, which are pneumatically actuated from the back, the components are pressed out of the containers and pass through the outlet openings and the outflow channels into the mixing device, where they come into contact with each other for the first time. The mixing device is connected to a mixing drive, which

simultaneously drives a screw conveyor to discharge the mixed components.

With the help of such devices, adhesives and sealants can be processed that only acquire their intended properties when their individual components are brought together. High demands are placed on the handling of the individual components within the device. For example, it must be prevented that the individual components come into contact with air. It must also be ensured that the individual components enter the mixing device in the correct mixing ratio. Finally, it is not unimportant that the entire device is lightweight so that it can be handled comfortably and precisely on the construction site.

The known device still required development in the aforementioned points. The invention is therefore based on the task of designing a device of the type mentioned at the beginning in such a way that precise mixing of the individual components is achieved with a simple and lightweight design.

This object is fundamentally achieved according to the invention in that the outflow channels have volumes whose volume ratio corresponds to the ratio of the volume displacement per unit of time when the ejection pistons move. The term outflow channel is not only to be understood as a single channel, but also as a system of several channels running parallel, each of which is connected to only one storage cylinder and therefore only serves to transport a specific component.

The basic idea of the invention is therefore that for a reproducible mixing of the individual components in a desired mixing ratio it is important that the volumes of the outflow channels are in a certain ratio, namely the ratio

ratio of volume displacement per unit of time when the ejection pistons are moving. It has been shown that this measure alone could significantly improve the function of the previously known device. The volumes of the outflow channels can correspond to the cross-sectional areas of the storage cylinders if the ejection pistons are each driven at the same speed, i.e. are synchronized to that extent.

In the embodiment of the invention, it is provided that the ejection pistons are seated on piston rods that emerge from the side of the storage cylinders facing away from the head plates and are connected to one another in such a way that their movement is synchronized. It has proven to be expedient that the receiving spaces for the containers are ventilated in order to avoid air build-up when the containers are inserted. This can be achieved by the ejection pistons having a ventilation opening, to which ventilation channels leading to the outside are connected. The piston rods can be used to guide the ventilation channels to the outside.

Independently of the invention described above, but preferably in combination with it, it is proposed that the head plates be mounted about a pivot axis transverse to the longitudinal axes of the storage cylinders, whereby it is expedient for the pivot axes to run outside the area of the storage cylinders, i.e. to extend above, below or next to the storage cylinders. In particular, if there are only two storage cylinders, it is advisable to arrange the storage cylinders parallel and next to each other and to have the pivot axis(es) run parallel to a plane that passes through the longitudinal axes of the storage cylinders. The hinged head plates allow for the pressed containers to be removed quickly and easily and for new containers to be inserted quickly and easily into the storage cylinders' receiving spaces. It is particularly expedient if the head plates are connected to each other or assembled in one piece and are mounted on a common

same pivot axis, so that when the head plates are pivoted, all the storage cylinders are opened. A particularly advantageous design has been achieved by arranging the storage cylinders horizontally next to one another and providing the pivot axis below the storage cylinders.

In conjunction with the pivoting arrangement of the head plates, it is possible for the outflow channels from the head covers to open into the pivot axis (es) designed as stationary hollow axis (es), and from there to have outlets to the mixing device run via pivot axes. With this design, it can be easily achieved that the transition from the outflow channels to the hollow axes is designed in such a way that they are closed when the head plates are pivoted in the opening direction . This measure serves to prevent any possible air contact with the components . The pivot axis outlets can be designed as hollow bolts, by means of which the pivot axis(es) is or are held stationary. The hollow bolts can be fastened to a holding plate in which the outflow channels continue from the hollow bolts to the mixing device. The outflow channels can each open into their own, concentric ring outflow channels, which have access to the mixing device. Each outflow channel can be divided into a number of individual channels, which are connected at one end to the respective ring outflow channel and at the other end to the mixing device. The ring outflow channels expediently surround a drive shaft, which is connected at one end to the mixing device and at the other end to the mixing drive.

Another feature of the invention is that the outflow openings are designed as piercing nozzles that protrude from the inside of the head plates. They should have sharp points or edges at the end , for example be cut at an angle , so that they can pierce the containers and enter them. This measure also serves to

to avoid any contact with air when opening the containers. It is particularly advantageous if the head plates have displacement bodies on the inside, preferably offset from the piercing nozzles, which tension the outer skin of the containers in such a way that they cannot move out of the way when the piercing nozzles are approached.

In a further embodiment of the invention, it is provided that the outflow channels within the head plates are designed as ring channels. They can be milled out, whereby they are covered on the inside by the displacement bodies.

In a manner known per se, it is provided that the supply cylinders on the sides of the ejection pistons facing away from the head plates have pressure chambers belonging to the ejection drive, which can be connected to an air pressure source. The pressure chambers can be connected to an air supply device which has a switching valve which is connected to the mixing drive in such a way that the switching valve is opened when the mixing drive is switched on.

According to a further feature of the invention, it is proposed that the pressure pistons are seated on piston rods and are axially adjustable relative to them in order to be able to adapt the receiving space exactly to the size of the containers.

It is also intended that guide pistons are present behind the pressure pistons, and the piston rods should be guided in the end covers of the pressure chambers.

In a manner known per se, it is expedient for the mixing drive to be designed as an electric drive. The storage cylinders should be arranged above the mixing drive and the mixing drive should be connected to the storage cylinders in the area of the head plates. Finally, it is expedient for the mixing device to be installed in the axial extension of the mixing drive.

arranged so that it sits below the storage cylinders and their head plates are exposed.

The invention is illustrated in more detail using an embodiment in the drawing. They show:

Figure 1 is a side view of the inventive

device with partial sections in the plane A-A (Figure 3)?

Figure 2 a plan view of the device

according to Figure 1;

Figure 3 a front view of the device

according to Figures 1 and 2;

Figure 4 a section through the device

according to Figures 1 to 3 in plane C-C (Figure 1);

Figure 5 shows a cross section through the device

according to Figures 1 to 4 in plane B-B (Figure 1);

Figure 6 shows a partial section through the device

according to Figures 1 to 5 in plane D-D (Figure 5).

As can be seen in particular from Figures 1 and 2, the device 1 has a commercially available electric motor 2, as is also used for drills or the like, so that a more detailed explanation is not necessary. It has a handle 3 with a button 4 for operating the electric motor 2.

At the front end , a drive motor 2 emerges from the electric motor

shaft 5, which projects into a shaft housing 6. In this shaft housing 6 there is an axial bearing 7, with which axial forces directed at the electric motor 2 are intercepted and passed on to the shaft housing 6. In this way, the electric motor 2 is relieved of axial loads.

A forward-facing nozzle of the shaft housing 6, which closely surrounds the drive shaft 5, protrudes into a flange disk 8, whereby the shaft housing 6 and the flange disk 8 are firmly connected to one another. In the upper area, the flange disk 8 has two horizontally adjacent, circular holes into which the front ends of two identically designed storage cylinders 9, 10 arranged next to one another protrude and are connected to the flange disk 8. Four stud bolts run horizontally parallel to the storage cylinders 9, 10, namely the stud bolts 11, 12 on the outside in the plane that goes through both longitudinal axes of the storage cylinders 9, 10, and the stud bolts 13, 14 in the middle, one above the other. The stud bolts 11, 12, 13, 14 extend to the rear ends of the supply cylinders 9, 10 and clamp an end plate 15 into which the supply cylinders 9, 10 extend. The supply cylinders 9, 10 therefore hang solely on the flange plate 8 and are therefore not supported by the electric motor 2 arranged underneath.

A piston rod 16, 17 extends coaxially in each of the supply cylinders 9, 10. Both piston rods 16, 17 protrude backwards from the supply cylinders 9, 10 through openings in the end plate 15 and are rigidly connected to one another there by a U-bracket 18. The openings in the end plate 15 are sealed by mechanical seals 19.

The front and inner ends of the piston rods 16, 17 are each provided with a pressing piston 20, the outer circumferences of which are in contact with the inner sides of the storage cylinders 9, 10. Immediately behind the pressing pistons 20, a guide piston 21 is provided, which guides the respective piston rod 16,

17 is guided centrally. The distance between the ejection piston 20 and the guide piston 21 can be changed by loosening an adjusting nut 22.

The guide pistons 21 and the ejection pistons 20 divide the interior of the supply cylinders 9, 10 into pressure chambers 23 at the rear and receiving chambers 24 at the front. The pressure chambers 23 are connected via inclined bores 25, 26, which run in the end plate 15, to a common pneumatic valve 27, which is flanged to the end plate 15 below and between the two supply cylinders 9, 10. It has a compressed air inlet 28, which can be connected to a compressed air source. The pneumatic valve 27 is connected to the inclined bores 25, 26 and is supplied with electrical energy from the electric motor 2 via a cable 29. The pneumatic valve 27 can be opened by pressing the button 4, which simultaneously starts the electric motor 2 and supplies the pressure chambers 23 with compressed air.

The receiving spaces 24 are ventilated to the outside atmosphere, namely via a longitudinal bore 30 in the piston rods 16, 17. They extend to the ends of the piston rods 16, 17 and there penetrate the fastening screws 31, which hold the primary bracket 18 to the piston rods 16, 17. Towards the front, the receiving spaces 24 and thus the storage cylinders 9, 10 are closed off by a cover-shaped head plate 32. As shown in particular in Figure 3, the head plate 32 has two bearing eyes 33, 34 at a distance from one another on the bottom, which surround a pivot axis 35. In this way, the head plate 32 can be pivoted forwards from the vertical position shown into a horizontal position, whereby the receiving spaces 24 of the storage cylinders 9, 10 are freely accessible. In the closed state, the head plate 32 is held by a clamping screw 36, which can be pivoted upwards after the clamping is released in order to release the head plate 32.

The swivel axis 35 is attached using two hollow bolts 37, 38, which pass through the swivel axis 35 between the bearing eyes 33, 34 and the flange disk 8 (Figure 6). Sealing hexagon screws 39, 40 are screwed into their rear ends, which are supported on the rear side of the flange disk 8 via support rings 41, 42. By tightening the hexagon screws 39, 40, the swivel axis 35 is pressed against further support rings 43a, 43b against the front side of the flange disk 8 and is thus fixed.

In the lower area, a distribution disk 44 is flanged to the front of the flange disk 8 by means of screws 45, 46, 47, 48. This is followed by a mixing device 49, which is surrounded by a mixer housing 50. The mixer housing 50 is attached to the flange disk 8 by screws 51, 52 in such a way that it can be removed after loosening the screws 51, 52 and turning it anti-clockwise, without the screws 51, 52 having to be removed for this purpose. The mixer housing 50 surrounds a mixing cone rotor 53 with axially extending mixing webs 54 and a conveyor screw 55 connected to the mixing cone rotor 53. The mixing cone rotor 53 and conveyor screw 55 are connected in a rotationally fixed manner to the drive shaft 5 of the pneumatic motor 2, and are therefore driven by it. At the front end, a plastic nozzle 56 is placed on the mixer housing 50, which has an outlet opening 57 at its free end.

The receiving spaces 24 are each connected to the interior of the mixer housing 50 via an outflow channel 58, 59. The two outflow channels 58, 59 have no connection with each other until they enter the mixer housing 50 and have identical total volumes. In detail, they are composed as follows.

The inside of the head plate 32 has a central recess for each storage container 9, 10, in which an insert 62, 63 is fastened by means of central screws 60, 61.

The inserts 62, 63 are shaped in such a way that an annular channel 64, 65 is formed in the head plate 32, which is located centrally to the longitudinal axis of the respective storage container 9, 10. The annular channels 64, 65 are connected to the respective receiving space 24 via obliquely cut out nozzles 66, 67.

Branch channels 68, 69 extend from the ring channels 64, 65, each of which is directed essentially vertically downwards and opens into blind holes 71, 72 via openings 70, which are formed axially into the pivot axis 35 from the outside. The blind holes 71, 72 have no connection in the middle and are closed by cover screws 73, 74 - which is not shown in Figure 6. The circumferential extent of the openings 70 in the pivot axis 35 is such that they are only aligned with the respective branch channel 68, 69 when the head plate 32 is in the vertical position shown. If the head plate 32 is pivoted forwards into the horizontal, the openings 70 are sealed by the bearing eyes 33, 34.

The blind hole 71 opens into the hollow bolt 37 and the blind hole 72 into the hollow bolt 38. A branch channel 76, 77 extends from each of the hollow bolts 37, 38, which penetrate the flange disk 8, directed obliquely towards the longitudinal axis of the drive shaft 5 (see Figure 5). They end at different heights, with the branch channel 76 on the left in Figure 6 connecting to an inner ring channel 78 and the branch channel 77 on the right connecting to an outer ring channel 79. The inner ring channel 78 and outer ring channel 79 run concentrically to the drive shaft 5 within the distribution disk 44 and are closed off by the contact with the flange disk 8. The branch channels 76, 77 as well as the inner ring channel and outer ring channel 79 have cross-sections such that the volumes of the branch channels 76, 77 on the one hand and the volumes of the inner ring channel 78 and outer ring channel 79 are equal.

A large number of outlet bores 80, 81 extend alternately in the circumferential direction from both the inner ring channel 78 and the outer ring channel 79, which open into the space between the mixer housing 50 and the mixing cone rotor 53. These outlet bores 80, 81 also belong to the system of the two outflow channels 58, 59, whereby they are each assigned to the outflow channel 58, 59 via which they are connected to the relevant storage cylinders 9, 10.

The device described above is operated as follows.

First, the clamping screw 36 is swiveled upwards so that the head plate 32 is released and can be swiveled downwards. Cartridges made of flexible plastic film are then inserted into the front openings of the receiving spaces 24, each of which contains an individual component, for example of a two-component adhesive. The piston rods 16, 17 with the associated ejection pistons 20 and guide pistons 21 are in the retracted, i.e. pushed backwards, end position. The cartridges and this end position are coordinated with one another in such a way that the cartridges just fit into the receiving spaces 24 and the head plate 32 can be swiveled upwards.

During this upward pivoting movement, displacement bodies 82, 83 protruding from the inserts 62, 63 come into effect. These displacement bodies are mounted below the cutting nozzles 66, 67 and compress the cartridges and strongly tension their film material. As the head plate 32 continues to swing upwards, the cutting nozzles 66, 67 then come into contact with the cartridges, pierce them and move into them. In this way, any air contact with the individual components contained in the cartridges is avoided.

After fixing the head plate 32 using the clamping screw 36

the button 4 can be pressed and the pneumatic valve 27 can be opened after its compressed air inlet 28 has been connected to a compressed air source. Due to this actuation, the pressure chambers 23 are supplied with compressed air. This results in the ejection pistons 20 being moved in the direction of the head plate 32. At the same time, the electric motor 2 drives the mixing cone rotor 53 and the conveyor screw 55 via the drive shaft 5.

Due to the displacement effect of the ejection piston 20, the components flow through the outflow channels 58, 59 into the mixing device 49, namely the one component located in the storage container 9 via the cutting nozzle 66, the ring channel 64, the branch channel 68, the opening 70, the blind hole 71, the hollow bolt 37, the branch channel 76, the inner ring channel 78 and the outlet holes 80 and the other component located in the storage cylinder 10 via the cutting nozzle 67, the ring channel 65, the branch channel 69, the opening (not visible here) in the pivot axis 35, the blind hole 72, the branch channel 77, the outer ring channel 79 and the outlet hole 81. Only after leaving the outlet holes 80, 81 do the individual components come into contact. to each other and are intensively mixed by the mixing cone rotor 53. The conveyor screw 55 then transports the mixed components to the plastic nozzle 56 and ensures that they exit from its outlet opening 57.

By releasing the button 4, the electric motor 2 is switched off. At the same time, the pneumatic valve 27 opens to the atmosphere so that the pressure chambers 23 are immediately relieved of pressure. This prevents the ejection pistons 20 from being pushed further and thus the components from flowing further.

Claims (1)

Hx, 1 Expectations; Weqener GmbH, Vaalser Str. 81, D-52074 Aachen Device for processing and dispensing at least two pasty components 1. Device (1) for processing and dispensing at least two pasty components which are pre-portioned separately in containers, with storage cylinders (9 _f 10) in each of which a container can be placed in receiving spaces (25) between a head plate (32) and an ejection piston (2), the ejection pistons (20) being movable in the direction of the head plates (32) by means of an ejection drive and the head plates (32) having outlet openings (66, 67) which continue in outflow channels (58, 59) for each component, which open into a mixing device (49) for mixing the components, which is connected to a mixing drive (2), characterized in that the outflow channels (58, 59) have volumes the volume ratio of which corresponds to the ratio of the volume displacement per unit of time during movement of the ejection pistons (20). 2. Device according to claim 1, characterized in that the ratio of the volumes of the outflow channels (58, 59) corresponds to the ratio of the cross-sectional areas of the storage cylinders (9, 10) and the ejection pistons (20) are driven at the same speed. 3. Device according to claim 2, characterized in that the ejection pistons (20) are seated on piston rods (16, 17) which emerge on the sides of the supply cylinders (9, 10) facing away from the head plates (32) and are connected to each other. 4. Device according to claim 3, characterized in that the receiving spaces (24) for the containers are ventilated. 5. Device according to claim 4, characterized in that the ejection pistons (20) have a ventilation opening to which ventilation channels (30) leading to the outside are connected. 6. Device according to claim 3 and 4 or 5, characterized in that the ventilation channels (30) run outwards through the piston rods (16, 17). 7. Device according to one of claims 1 to 6, characterized in that the head plates (32) are exposed in such a way that they can be removed from the storage cylinders (9, 10). 8. Device according to claim 7, characterized in that the head plates (32) are mounted about a pivot axis (35) transverse to the longitudinal axes of the storage cylinders (9, 10). 9. Device according to claim 8, characterized in that the pivot axis(es) (35) extend outside the area of the storage cylinders (9, 10). 10. Device according to claim 8 or 9, characterized in that the storage cylinders (9, 10) are arranged parallel and next to one another and the pivot axis(es) (35) runs parallel to a plane which passes through the longitudinal axes of the storage cylinders (9, 10). fixed. 11 12. Device according to claim 11, characterized in that the head plates (32) are connected to one another or are combined in one piece and that they sit on a common pivot axis (35). 13. Device according to claim 12, characterized in that the storage cylinders (9, 10) are arranged horizontally next to one another and the pivot axis (35) is provided below the storage cylinders (9, 10). 14. Device according to one of claims 8 to 13, characterized in that the outflow channels (58, 59) from the head plates (32) open into the pivot axis (35) designed as a stationary hollow axis(s) and from there run via pivot axis outlets (37, 38) to the mixing device (49). 15. Device according to claim 14, characterized in that the transitions of the outflow channels (58, 59) to the hollow axle(s) (35) are designed such that they are closed when the head plates (32) are pivoted in the opening direction. 16. Device according to claim 14 or 15, characterized in that the pivot axis outputs are designed as hollow bolts (37, 38) via which the pivot axis (35) is or are held stationary. 17. Device according to claim 16, characterized in that the hollow bolts (37, 38) are fastened in a holding plate (8) in which the outflow channels (58, 59) continue from the hollow bolts (37, 38) to the mixing device (49). 18. Device according to claim 17, characterized in that the outflow channels (58, 59) each f ■:·."·:. i IM ¹ ·:· because they open into their own concentric ring outflow channels {78, 79) which have access to the mixing device (49). 19. Device according to claim 18, characterized in that the ring outflow channels (78, 79) surround a drive shaft (5) which is connected on one side to the mixing device (49) and on the other side to the mixing drive (2). 20. Device according to one of claims 1 to 19, characterized in that the outflow openings are designed as piercing nozzles (66, 67) which protrude from the inside of the head plates (32). 21. Device according to claim 20, characterized in that the piercing nozzles (66, 67) are provided with sharp points or edges at the ends. 22. Device according to claim 21, characterized in that the piercing nozzles (66, 67) are cut off at an angle. 23. Device according to one of claims 1 to 22, characterized in that the head plates (32) have displacement bodies (82, 83) on the inside. 24. Device according to claim 23, characterized in that the displacement bodies (82, 83) and piercing nozzles (66, 67) are offset from one another. 25. Device according to one of claims 1 to 24, characterized in that the outflow channels (58, 59) within the head plates (32) are designed as annular channels (64, 65). 26. Device according to claim 24 or 25 and 26, IST · characterized in that the annular channels (64, 65) are covered on the inside by the displacement bodies (62, 63). 27. Device according to one of claims 1 to 26, characterized in that the supply cylinders (9, 10) have, on the sides of the ejection pistons (20) facing away from the head plates (32), pressure chambers (23) belonging to the ejection drive, which can be connected to an air pressure source. 28. Device according to claim 27, characterized in that the pressure chambers (23) are connected to an air supply device which has a switching valve (27). 29. Device according to claim 28, characterized in that the switching valve (27) is connected to the mixing drive (2) in such a way that the switching valve (27) is opened when the mixing drive (2) is switched on. 30. Device according to one of claims 1 to 29, characterized in that the ejection pistons (20) are seated on piston rods (16, 17) and are axially adjustable relative to these. 31. Device according to one of claims 1 to 30, characterized in that guide pistons (21) are provided behind the pressure pistons (20). 32. Device according to claim 30 or 31, characterized in that the piston rods (16, 17) are guided in end covers (15) of the pressure chambers (23). 33. Device according to one of claims 1 to 32, characterized in that the mixing drive is designed as an electric drive (2). ; 5! 34. Device according to one of claims 1 to 33, characterized in that the storage cylinders (9, 10) are arranged above the mixing drive (2). 35. Device according to claim 34, characterized in that the mixing drive (2) is connected to the storage cylinders (9, 10) in the region of the head plates {32}. 36. Device according to one of claims 1 to 35, characterized in that the mixing device (49) is arranged in an axial extension of the mixing drive (2).