DE19845716A1 - Mounting arrangement for regular maintenance prone components on a viscous fluid, especially resin, metering unit has a holding plate for the pumps and clamps for the valves - Google Patents

Abstract

Component storage vessels(11,12) have a rectangular cross-section with metering units(13,14) in the base and drive units(21) for the latter in the cover(19). The base includes a plate which holds both the metering pump cylinders(17,18) inside the base and also clamps for holding non-return valves(27,28) and a three way valve(29) on the plate.

Description

The invention relates to an assembly device for maintenance units a metering device for viscous substances, such as casting resin, the metering device consisting of at least one evacuable, optionally with a mixing device equipped storage container for the substance, and one assigned to this container Metering pump device, the metering piston of which forms a valve which is located at Pushing the piston into the dosing piston cylinder closes as well as Driving devices for the piston.

Such a metering device is already known from DE 38 03 418 A1. These described device uses two reservoirs, one for resin, one second for hardener, each container having an associated metering pump. The quantities of resin or hardener delivered by the two metering pumps are in mixed in a mixer and then used to cast components.

A disadvantage of the known device is that units requiring maintenance, such as metering pumps, check valves, three-way valves and the like. difficult to access are, so that their exchange is associated with longer downtimes.  

The problem increases if the metering device is compact because z. B. is a movable system. The compactness that for the Movability is cheap, namely the accessibility of the individual deteriorates Units.

The object of the invention is therefore to develop the arrangement such that this Time loss when replacing components is eliminated.

The object is achieved in that the storage container is rectangular in cross section Containers are provided, in the bottom of which the metering devices are integrated, and whose cover carries drive devices for the metering devices, and that the Bottom comprises a holding plate, on the one hand, the cylinders of the metering pumps holds within the base plate, on the other hand has clamping devices that the Dosing pumps subordinate units, such as check valve, three-way valve press on the holding plate. Rectangular containers are easier to assemble than e.g. B. round containers, the arrangement of drive devices on the lid makes it easily accessible and the clamping devices allow quick access Change of units held with it.

The clamping devices can be on two opposite sides of the Hold bracket-mounted bracket, which is bent obliquely at its free end are and hold a clamping bolt, the clamping force approximately to the middle of the Holding plate is directed. This arrangement results in particularly simple assembly and particularly convenient access. This also applies to further training according to the two the units held by the clamping device (check valves) the shape a box with an obliquely cut edge to form an attack surface for the clamping bolt end.

One of the units held by the clamping device (three-way valve) can have the shape of a box, the one of the two adjoining ones box-shaped units (check valves) is held.  

A screwable holder for drive devices can be mounted on the cover his.

The metering pump device of the one reservoir can have two metering pumps have, the dosing piston with a piston rod pressure-tight through the Lid of the storage container is guided and each connected to a rack, which are arranged axially displaceable in a common gear housing and by the drive mounted on the cover of the housing can be driven in opposite directions. This enables the drive units to be easily accessible. This is especially true if the two racks are driven by a single common gear become.

The assembly is also simplified if, according to a training between Piston rod end and rack end a removable coupling member is arranged. This particularly simplifies the exchange of the Sealing sleeves for the piston rods exposed to wear.

The drive devices preferably comprise a servo motor or a Stepper motor, possibly with a downstream reversing gear, the movement of is controlled by a microprocessor. This type of drive makes it particularly easy interchangeable units. It is also favorable if according to another one Development of the invention, the metering piston cylinder in a the bottom of Storage container forming block are arranged, of which also the side walls of the storage container.

The same applies if the piston rods are inserted into the cover of the Storage container are guided, which can be mounted from the outside.

The invention is explained in more detail below on the basis of exemplary embodiments, which are shown in the drawings.

It shows:  

Fig. 1 shows schematically an arrangement in which the mounting means according to the invention can be used;

Figure 2 is an axial sectional view of a reservoir designed in accordance with the invention with two metering pumps.

Fig 3 is rotated in an axial sectional view with respect to FIG 2 to 90 °, a similar arrangement to Figure 2, in addition to a mixing device...;

Fig. 4 is an enlarged axial sectional view of the drive of the two dosing pistons;

FIG. 5 is an axial sectional view of the two dosing with downstream check valves and three-way valve;

Fig. 6 is a view on two together on a movable frame mounted according to the invention equipped metering devices;

FIG. 7 is a top view of the arrangement according to FIG. 6;

Fig. 8 is a left side view of the arrangement of FIG. 6;

Fig. 9 is a sectional view taken along line AA of Fig. 5; and

Fig. 10 is a sectional view taken along the line BB of Fig. 5.

Fig. 1 shows schematically a first reservoir 10 , for example for resin, a second reservoir 11 , for example for hardeners, each of which forms a valve 15 , 16 via metering pump devices 13 , 14 , which valve closes when the piston is inserted into the metering piston cylinder 17 , 18 , a drive unit 21 being provided for the metering pumps 13 , 14 above the cover 19 , which closes the storage container in a pressure-tight manner. As can already be seen in the diagram, each storage container 10 , 11 has two metering pumps 13 , 14 , the metering piston rods 70 , 74 of which are pressure-tightly guided through the cover 19 of the storage container (for example 10) and are each connected to a rack 23 , 24 . The drive of these two racks 23 , 24 is preferably carried out by a single common gear 25 which meshes with the two racks 23 , 24 and thus leads to an opposite drive of the two piston racks 70 , 74 when the gear 25, for example by a servo or Stepper motor 26 is driven. Fig. 1 also reveals that the two metering pumps 13 , 14 of the storage container 10 shown in the figure on the left a check valve 27 , 28 is connected downstream, the outputs of which via a three-way valve 29 to a common dispensing point (line 30 ) for the substance of the container 10 is performed. The structure of the storage container 11 shown on the right in FIG. 1, the content of which is metered out via line 130 , is quite analogous. The lines 30 , 130 are connected, for example, to a mixing stage 31 in order to z. B. a static mixer and possibly other metering devices within a vacuum space 32 components that may be set up on a movable plate 33 .

If the storage container is filled with a substance that has sedimenting constituents, a stirring and mixing device is necessary, as is shown schematically at 34 with respect to the storage container 10 . It is a wing protruding into the stock material, which can be set in motion by a drive device 35 .

A vacuum device 36 can evacuate the two storage containers 10 , 11 and the vacuum chamber 32 . The corresponding vacuum lines or valves are shown schematically in FIG. 1. It can also be seen in FIG. 1 that the metering piston cylinders 17 , 18 are connected to funnel surfaces 37 , 38 and ensure that no substance gets stuck in any corners of the container when the metering pumps 13 , 14 pump off the stock.

A feed line 39 is used, for example, to supply material for filling the container 10 .

Structural details are explained with the aid of the following figures. Thus, FIG. 2 in an axial sectional view of a reservoir 10 with metering devices, wherein like reference numbers are selected for the same components. Of particular interest here is the shape of the container, which consists of a rectangular base block 42 , are inserted into the cylinders 17 , 18 from below and are held in this position by a plate 44 , which also
via clamp brackets 46 check valve blocks 48 and one
Three-way valve block 50 holds. The base block 42 is in turn held by supports 52 , which can be part of a movable carriage 54 , as shown in FIG. 6. This carriage 54 comprises, for example, two arrangements according to FIG. 2, see also the top view of the arrangement according to FIG. 6 in FIG. 7, and it is clear that here the containers are not round, but have a rectangular shape. The rectangular base blocks 42 each have walls 56 connected to one another at the edges (welded or braced to one another) and bear a rectangular cover 19 at their upper end in a pressure-tight manner. In the cover 19 , as can be seen in FIG. 2, sleeves 58 are provided which can be inserted from the outside and are held by a sleeve holder 60 . A piston rod 70 or 74 is inserted through each of these sleeves. A T-piece 62 is screwed onto the cover and serves as a support for a gear block 64 , in which on the one hand the racks 23 , 24 connected to the piston rods 70 , 74 are guided axially displaceably, and on the other hand with the racks 23 , 24 Intermeshing gear 25 is mounted, which is connected to a drive motor 26 flanged to the block 64 via a deflection gear (not shown here).

As can be seen in FIG. 3, a mounting device 66 can also be mounted on the cover 19 , which carries the motor 35 of a stirring and mixing device, which mixing device extends sealed through a corresponding opening in the cover 19 , the motor 35 with a drive shaft 34 is connected, which extends between the two piston drive rods 70 , 74 and is connected to a drive propeller or drive wing 68 and enables the contents of the container 10 to be thoroughly mixed. The wing 68 is advantageously located near the funnel-shaped inlet openings for the two metering pumps and therefore ensures that only well-mixed material is conveyed by these metering pumps.

Fig. 4 shows in greater detail the drive of the metering pump device according to the invention. Of particular interest here is a coupling piece 71 which is arranged between the upper end 72 of the piston drive rod 74 on the one hand and the lower end 76 of the rack 24 on the other hand. A long bolt 78 penetrates a central bore 80 in the rack 24 , a bore 82 in the coupling piece 71 and is received by a blind threaded bore 84 in the upper end of the piston drive rod 74 . The drive pin 78 holds these three components together. The advantage of this arrangement is that, for example, when the sealing sleeve 58 is worn, it can be replaced without having to remove the lid 19 from the container 10 . For this purpose, only the bolt 78 needs to be removed, whereupon the flange parts 76 and the piston drive rod 74 can then be pushed apart, whereupon the coupling piece 71 can then be removed between them. The sleeve component 58 can now be pulled upward from the piston drive rod 74 . A new cuff component can then be pushed back on and, after the coupling piece 71 has been reinserted and the screw 78 has been inserted, the arrangement can be brought back into the operating state.

The operation of the dosing pump device described is as follows:
It is assumed that the storage container 10 is at least partially filled with substance and that this substance has already been mixed (if it is, for example, resin containing sedimenting substances) or does not require a mixture (if it is, for example, a hardener ). In the illustrated in Fig. 5 position of the pistons 86, 88 into the cylinder 16, 17 material 137 where it is in the position shown on the left in Fig. 5 runs from the reservoir 10 along the funnel surface 37 into the region of the cylinder 17, the Piston 88 can pass through this piston and thus flows into the underlying cylinder space 90 , including the underlying areas 92 , 94 , 96 , which are formed by the plate 44 , the distributor block 98 and the check valve 27 and 28 , respectively. The filling process continues until all empty spaces are filled.

In the piston device 86 , a sealing cover 100 is placed on a piston edge, as a result of which material cannot flow through the piston 86 from above, as was described for the piston device 88 of the cylinder 17 shown on the left in FIG. 5. Nevertheless, 100 material has also accumulated above this cover, and it is assumed that material from previous piston strokes is also contained below the cover 100 in the spaces 92 , 94 , 96 . If in this moment, gear 25 of FIG. 4. As rotated by the motor 26 under control of a microprocessor device or the like that it moves in the counterclockwise direction, the meshing with the wheel 25 the rack 23 moves upward and at the same time the opposite rack 24 by below. First of all, a certain dead course T must be overcome, which is determined by the distance of the cover 100 from the edge of the piston 88 on the left-hand side of FIG. 5. During this piston movement, the cover 100 of the left-hand piston device 88 in FIG. 5 moves towards the corresponding edge of the piston 88 and thereby closes the flow path 104, indicated by arrows, between the upper region of the container 10 and the cylinder space 90 . At the same time, with the right-hand piston arrangement 86, the cover 100 moves away from the piston 86 and opens up such a flow path. Upon further movement, which goes beyond the lost motion T, moves the now of the left piston 88 in the cylinder 17 to the cylinder chamber 90 downwards and presses there mass in or fabric through the regions 92, 94, 96 against the force of the check valve arrangement 27 into the channel 106 and from there to the three-way valve 29 , which in this position leads the material to an outlet opening 108 , where a screw connection to a hose 30 , as shown in FIG. 1, may exist. While the piston 88 moves downward in the cylinder 17 by a certain amount, mass is displaced in accordance with the piston cross section and this amount and now reaches the outlet 108 . The quantity is precisely defined by the path of the piston and can therefore be metered. In the same period of time, the piston 86 shown on the right in FIG. 5 and in a flow path similar to that of the arrangement on the left labeled 104 moves upward and during this movement allows material to flow through into the space below the piston device 86 . Since this flow occurs without pressure, the check valve underneath is not opened and material cannot reach the area of the three-way valve 29 . The piston movement can be interrupted several times during the downward or upward movement, for example in order to dispense different amounts during this time. The downward movement can also be continuous if a large amount is to be metered, which, for. B. exceeds the volume of the cylinder space 90 . In this case, the left piston 88 will travel, for example, to the lower end of the cylinder arrangement 17 shown on the left in FIG. 5 and then stop, while at the same time the right piston 86 reaches an upper position according to FIG. 5. Now the direction of rotation of the gear 25 is reversed, ie it runs in the clockwise direction, whereupon the left piston 88 begins to move upwards and at the same time the right piston 86 downwards. After overcoming the dead path T, the sequence described is repeated, only that the roles are now reversed, ie that the right-hand check valve now conveys material down to the three-way valve 29 , while the left-hand valve enables the piston volume 90 to be filled. During this movement, which now takes place in the opposite direction, material is again conveyed, continuous operation being made possible, apart from the short dead period for the movement around the path T.

The double-acting pump described here eliminates waiting times between the filling stroke and the dosing stroke, resulting in a time saving of more than 50% can lead.

The lost motion caused by the closing path (path T) and any gear play (play between the teeth of the gear 25 and that of the toothed racks 23 and 24 ) can be compensated for by the electronic control system, so that no inaccuracies have to be feared.

The square shape of the container results in greater compactness at the same time larger storage volume, whereby the quickly replaceable Check valve arrangement leads to easier handling. Through the double-acting lifting device and the more compact arrangement is made possible Overall arrangement to accommodate on a movable carriage, so that it for several areas of use or in different places of resin recycling  can be used.

The four walls of the storage container can be dismantled and therefore allow good access to the interior of the storage container. This also makes the floor block easily accessible. By simply loosening the handles 16 , the block-like check valves can be exchanged in a rapid process, as can the block 50 of the three-way valve located in between.

The arrangement on a movable carriage is designed so that all hand levers are easily accessible, as are the drive and arranged on the cover Mixing devices.

Claims (11)

1.Mounting device for maintenance-requiring structural units of a metering device for viscous substances, such as casting resin, the metering device consisting of several evacuable storage containers ( 11 , 12 ) optionally equipped with a mixing device for the components of the substance, and a metering pump device ( 13 , 14 ), the metering piston ( 86 , 88 ) forms a valve ( 15 , 16 ) which closes when the piston is pushed into the metering piston cylinder ( 17 , 18 ), and with drive devices ( 21 ) for the piston, characterized in that as Storage containers ( 11 , 12 ) with rectangular cross-section are provided, in the bottom ( 42 ) of which the metering devices ( 13 , 14 ) are integrated, and whose cover ( 19 ) carries drive devices ( 21 ) for the metering devices ( 13 , 14 ), and that the bottom comprises a holding plate ( 44 ) which, on the one hand, the cylinders ( 16 , 17 ) of the metering pumps within de r holds the base plate ( 44 ), on the other hand it has clamping devices ( 46 ), which assemblies downstream of the metering pumps ( 13 , 14 ), such as check valve ( 27 , 28 , 48 , 50 ), three-way valve ( 29 , 50 ), on the holding plate ( 44 ) press on. 2. Mounting device according to claim 1, characterized in that the clamping devices ( 46 ) comprise two brackets mounted on two opposite sides of the holding plate ( 44 ), which are bent obliquely at their free end and hold a clamping bolt, the clamping force of which approximately to the middle of the Holding plate ( 44 ) is directed. 3. Mounting device according to claim 2, characterized in that two of the units held by the clamping device ( 48 ) (check valves) ( 27 , 28 ) have the shape of a box with an obliquely cut edge to form an engagement surface for the clamping bolt end. 4. Mounting device according to claim 2 or 3, characterized in that one of the clamping device ( 46 ) held units ( 50 ) (three-way valve) has the shape of a box, which is held by double-sided further box-shaped units ( 48 ) (check valves) . 5. Mounting device according to one of claims 1 to 4, characterized in that on the cover ( 19 ) a screwable bracket ( 62 ) for drive devices ( 21 ) is mounted. 6. Mounting device according to claim 5, characterized in that the metering pump device of a reservoir has two metering pumps, the metering piston with a piston rod ( 70 , 74 ) pressure-tight through the lid ( 19 ) of the reservoir ( 10 , 11 ) and each with a Rack ( 23 , 24 ) are connected, which are arranged axially displaceably in a common gear housing ( 64 ) and can be driven in opposite directions by the drive ( 25 ) mounted on the cover of the housing. 7. Mounting device according to claim 6, characterized in that the two racks ( 23 , 24 ) are driven by a single common gear ( 25 ). 8. Mounting device according to claim 7, characterized in that a removable coupling member ( 71 ) is arranged between the piston rod end ( 74 ) and the rack end ( 76 ). 9. Mounting device according to one of claims 1-8, characterized in that the drive devices ( 21 ) comprises a servo motor or a stepping motor ( 26 ), optionally with a downstream reversing gear, the movement of which is controlled by a microprocessor. 10. Mounting device according to one of claims 1-9, characterized in that the metering piston cylinders ( 16 , 17 ) in a the bottom ( 42 ) of the storage container ( 10 , 11 ) forming block ( 42 ) are arranged, of which the side walls of the Out of the reservoir ( 10 , 11 ). 11. Mounting device according to one of claims 1-10, characterized in that the piston rods ( 70 , 74 ) through sleeve inserts ( 58 ) in the lid ( 19 ) of the storage container ( 10 , 11 ) are guided, which can be mounted from the outside.