DE19921874B4 - Device for surface grinding flatware - Google Patents

Abstract

contraption for surface grinding of burnt flatware (58), in particular plates (60) from Bone China (BC) or from Vitreous China (VC), to the whole Bottom and on the entire top, where for grinding the entire surface the flatware underside a first grinding device (12) and for grinding the entire surface of the flatware top a second grinding device (14) is provided, wherein the first Grinding device (12) has a first rotary table (16) with rotating Vacuum suction devices (20) for holding the flatware to be ground (58) on its upper side and the second grinding device (14) a second turntable (18) with rotating vacuum suction means (38) for holding the flatware (58) to be ground at its Bottom, and the first turntable (16) and the second turntable (18) are arranged side by side such that they are located on a common transfer area (36) overlap, So that the Flatware Bottom and the flatware top side independently grindable are.

Description

The The invention relates to a device for surface grinding of fired Flatware, in particular plates from bone china (BC) or from Vitreous China (VC), at its entire bottom and at its entire Top.

Flatware, especially from BC or from VC, indicate after the first fire their surface, i.e. on its underside and on its top, smallpox-like elevations, which are detrimental to the subsequent decorating and glazing or lead to a production committee. This smallpox increases have to so be eliminated to prevent the aforementioned production committee. To eliminate the smallpox-like increases so far come two Grinding methods for use, namely the vibratory grinding with so-called vibratory finishing machines or the superficial to brush of the flatware. During vibratory grinding, vibration drums are used or vibration pots for use in which there are vibration blasted sliding bodies. Due to the vibration of the Gleitschliffkörper comes the corresponding Lubricant body fill in a quasi-random, i. undirected fluid state. The product flow remains in this pile undirected, automation of the grinding process is hardly possible.

At the superficial to brush of the flatware come brushes pairs For example, from diamond-coated plastic brushes for use. The brushes of the respective brush pair are arranged such that they each other are engaged. The brushes are subject to due this mutual engagement is a wear. The brushes are guide rollers assigned to which the surface to be ground flatware, especially plates while supported the grinding process becomes. The flatware to be ground is moved through the rotating brushes in Rotation offset. For this it is necessary that the brushes with a corresponding Press sanding pressure against the flatware to be ground. by virtue of This intensive contact of the brushes with the sanding Flatware becomes the above mentioned Brush wear continues elevated. The Service life of the brushes is so limited. Also this brush method is done manually, with the bottom and the top of the flatware at the same time brushed, i.e. be sanded. The cut quality leaves nothing to be desired.

The DE 36 36 602 A1 describes a grinding system for fine ceramic products with a feeder, a first and a second grinding device and a discharge device, each with a workstation. With this known grinding system plates, plates, bowls and tureens of different shape and size can be ground while improving the surface quality of the foot of the product and with an increase in the throughput of a plant. For this purpose, a clock-driven converter is arranged centrally to the workstations, which is equipped with four attached to a turnstile and offset by 90 ° arms, which are each provided with a manifold via a pressure-controlled lifting unit and a mechanically releasable directional control valve. The lifting units are in the working position with their central axis above the centers of the workstations. The four mechanically releasable directional control valves are coupled to a switching curve fixed radially to the workstation of the discharge device on the distributor block. Hubbegrenzungsanschläge are mounted in the field of work stations of each grinding device, so that by means of each lifting unit, the fine ceramic products in a certain time interval in constantly changing position regime with the four workstations simultaneously in contact. In this known grinding system, it is only about improving the surface quality of the foot of the product. For this purpose, this known grinding system on two grinding devices in the form of known per se belt grinding machines. The first grinding device has a coarse-grained grinding belt, and the second grinding device has a fine-grained grinding belt. The coarse-grained abrasive belt is used to pre-grind the product foot and the fine-grained abrasive belt is used to finish grinding the product foot.

The U.S. 4,594,768 describes a machine for grinding the peripheral edge of flatware.

From the US 2,587,271 a system is known which allows grinding of the top and bottom of dishes; There, the dishes are rotated in the system by 180 degrees, ie there are no two turntables arranged side by side such that they overlap at a common transfer area, so that the bottom and the top of flatware are mutually independently sandable.

From the DE 38 38 898 A1 is a grinding machine for ceramic material is known in which turntables are arranged side by side such that they overlap at respective common transfer areas. However, this known grinding machine is also provided only for grinding the feet of the ceramic Guts, the grinding stations are assigned to a single of these turntables.

The U.S. 3,399,498 discloses a facility for Editing the edges of ceramic objects, such as plates or the like, with two hubs, which are arranged side by side spaced from each other. These two hubs have no common overlap area. Rather, there is a turntable interposed, which takes over the objects from the first hub and passes to the second hub. The turntable has a grinding device, by means of which the peripheral edge of the respective ceramic article is ground.

Of the Invention is the object of a device of the initially with a high level of productivity. a good cut quality is achieved.

These The object is achieved with a device having the features of claim 1 solved. Preferred embodiments or further developments of the device according to the invention are characterized in the subclaims.

While usually the bottom and the top of the flatware are ground simultaneously takes place according to the invention a spatial and temporal separation of the grinding of the bottom and the top of the flatware, which in particular is plates from BC or from VC.

at the device according to the invention can the first grinding device have at least one rotating brush. Likewise, it is possible that the first grinding device has at least one vibration pot with Gleitschliffkörpern.

According to the invention the first grinding device a first rotary table with rotating Vacuum suction devices for holding the flatware to be ground on top of it.

The / each brush the first grinding device and the vacuum suction devices of first turntable are preferably driven in such a way that at the respective contact area between the brush and the flatware to be ground opposite each other Tangential speeds occur.

On this way it is possible the brush or To increase grinding speed accordingly, because the self-rotation the respective vacuum suction device and thus the internal rotation the flatware to be ground in particular plate from BC or out of VC the grinding power added to the rotational movement of the corresponding brush.

at the device according to the invention it is advantageous if the first turntable, a feed conveyor for the associated with grinding flatware to the degree of automation increase accordingly. For the same purpose, i. the further increase in productivity, it is helpful when the rotating vacuum suction devices are provided in groups at the first turntable because it is then possible Simultaneously grind several plates on their underside optimally.

Similarly Is it possible, that the rotating brushes the first grinding device are provided in groups: thereby can the rotating brushes of the different brush groups the same grinding properties of the first grinding device or preferably have different abrasive properties to in a first step, as it were, a preliminary grinding and in one Subsequent step to perform a fine grinding can.

The second grinding device of the device according to the invention preferably has at least one rotating brush on.

In Adaptation to the first grinding device according to the invention has the second Grinding device a second turntable with rotating vacuum suction devices for holding the flatware to be ground on its underside on. As already mentioned above in connection with the first grinding device accomplished has been able to the / each brush the second grinding device and the vacuum suction devices the second turntable are driven in such a way that at the respective contact area between the appropriate brush and the tangential flatware to be ground opposite tangential speeds occur, reducing the grinding speed at the flatware top is correspondingly large.

As on the first turntable can also the rotating vacuum suction devices on the second turntable be provided in groups: the same applies to the rotating brushes of second grinding device, these can also be in groups be provided.

Around also on the top of the flatware a pre-grinding and a Carry out fine grinding to be able to can the rotating brushes of the different brush groups of the second grinder - like the Brush groups the first grinding device - different Own grinding properties.

Characterized in that in the apparatus according to the invention, the first turntable and the second turntable are arranged side by side such that they overlap at a common transfer area, there is the advantage of an optimal product flow or product passage of the flatware to be ground. By such a design, there is the advantage that the flatware to be ground, in particular to be ground plates from BC or VC, can be automatically transferred from the first turntable to the second turntable to follow the grinding of the flatware bottom flatware To grind top. After grinding the top of the flatware this is removed from the second turntable at a take-off position. Thereafter, the brushed or ground flatware, for example, decorated and glazed.

Further Details will be apparent from the following description of a in the drawing schematically illustrated embodiment of the device according to the invention for surface grinding of flatware, especially plates.

It demonstrate:

1 a side view of the device for surface grinding of flatware, in particular of plates,

2 a view of the device according to 1 in the direction of view from above,

3 a detail of 1 to illustrate a portion of the first grinding device,

4 one of the 3 similar representation of a second embodiment of the first grinding device, and

5 in one of the 3 Similarly, a portion of the second grinding device of the device according to the 1 and 2 ,

The 1 and 2 show a schematic representation of an embodiment of the device 10 for surface grinding of flatware, in particular of plates, on its underside and on its upper side. The device 10 has a first grinding device 12 for surface grinding of the flatware bottom and a second grinder 14 for surface grinding of flatware topside. The first and the second grinding device 12 and 14 are from each other. spatially separated. The first grinding device 12 has a first turntable 16 and the second grinding device 14 has a second turntable 18 on.

The first turntable 16 is with rotating vacuum suction devices 20 provided, which serve to hold the sanding flatware at its top. How out 2 it can be seen, are the vacuum suction devices 20 at the first turntable 16 in groups, ie in pairs in the illustrated embodiment, provided.

The first grinding device 12 has brushes 22 on, like the vacuum suction devices 20 the first turntable 16 are provided in groups or in pairs. Every brush 22 is with a drive motor 24 connected. Each vacuum suction device 20 the first turntable 16 is with a drive 26 connected. The example. Against the horizontal slightly inclined brushes 22 and the vertical vacuum suction devices 20 the first grinding device 12 or the first turntable 16 are driven in such a way that at the contact surface between the respective brush 22 and the bottom flatware to be ground or its bottom side encounter opposite tangential velocities. Is in 1 through the arcuate arrows 28 indicated.

The first turntable 16 is by means of a drive device 30 about a vertical axis 32 rotatably driven. Out 2 it can be seen that the first turntable 16 a feed conveyor 34 assigned. With the help of the feed conveyor 34 becomes sanding flatware, especially plates, the device 10 gradually fed automatically and with the help of the first turntable 16 gradually to the brushes 22 the first grinding device 12 emotional. With the help of brushes 22 The underside of the flatware is ground on its entire surface. After this sanding of the flatware bottom, the flatware is at a common transfer area 36 from the first turntable 16 automatically to the second turntable 18 to hand over. In this case, the vacuum suction devices 20 the first turntable 16 deactivated and at the same time vacuum suction devices 38 of the second turntable 18 activated, ie subjected to vacuum, to hold the ground on their bottom plate and with the help of brushes 40 the second grinding device 14 abrading flat on its upper side. The brushes 40 the second grinding device 14 are - like the brushes 22 the first grinding device 12 - Connected to drive motors and group - ie provided in pairs. Accordingly, the vacuum suction devices 38 of the second turntable rotating stepwise about a vertical axis 18 provided in groups or in pairs.

After grinding the top of the flatware this is a removal position 42 of the second turntable 18 fed and there from the second turntable 18 for further processing handed over the ground flatware. This can be a decoration and glazing of the flatware. For this purpose, the second turntable 18 with a drive device 44 connected.

The first turntable 16 is using his drive device 30 in the direction of the arrow 46 and the second turntable 18 is using the drive device 44 in the direction of the arcuate arrow 48 moving gradually, with the incremental movements of the first and second turntables 16 and 18 adapted to each other.

While the 3 and 5 Training of grinding equipment 12 respectively. 14 with brushes 22 respectively. 40 clarify, shows the 4 a first grinding device 12 with vibration pots 50 , in which there are Gleitschliffkörper 52 in a bed. During the vibration of the vibration pots 50 form the Gleitschliffkörper 52 a randomly moving fluid 56 which is the bottom of the flatware 58 abrade. Such a flatware 58 in the form of plates 60 is also from the 3 and 5 seen.

Same details are in the 1 to 5 each with the same reference numerals, so that it is unnecessary, in conjunction with the figures, to describe all the details in detail.

10

contraption

12

first grinding device (from 10 )

14

second grinding device (from 10 )

16

first turntable (from 10 )

18

second turntable (from 10 )

20

Vacuum suction devices (on 16 )

22

Brush (from 12 )

24

Drive motor (for 22 )

26

Drive (for 20 )

28

arcuate arrow

30

Drive device (from 16 )

32

Vertical axis (from 16 )

34

Feed conveyor (on 16 )

36

Transfer area (between 16 and 18 )

38

Vacuum suction device (on 18 )

40

Brush (from 14 )

42

Acceptance position (on 18 )

44

Drive device (from 18 )

46

arcuate arrow

48

arcuate arrow

50

vibratory bowl

52

Lubricating body (in 50 )

54

Bed (in 50 )

56

Fluid (from 54 )

58

flatware

60

Plate

Claims (13)

Device for surface grinding of burnt flatware ( 58 ), in particular plates ( 60 ) from Bone China (BC) or from Vitreous China (VC), at their entire underside and at their entire upper side, wherein a first grinding device is used for grinding the entire surface of the flatware underside ( 12 ) and for grinding the entire surface of the flatware topside a second grinding device ( 14 ), wherein the first grinding device ( 12 ) a first turntable ( 16 ) with rotating vacuum suction devices ( 20 ) for holding the flatware to be ground ( 58 ) on its upper side and the second grinding device ( 14 ) a second turntable ( 18 ) with rotating vacuum suction devices ( 38 ) for holding the flatware to be ground ( 58 ) on its underside, and the first turntable ( 16 ) and the second turntable ( 18 ) are arranged side by side such that they are located at a common transfer area ( 36 ) overlap, so that the flatware bottom and the flatware topside are independently sandable. Apparatus according to claim 1, characterized in that the first grinding device ( 12 ) at least one rotating brush ( 22 ) having. Apparatus according to claim 1, characterized in that the first grinding device ( 12 ) at least one vibration pot ( 50 ) with vibratory grinding bodies ( 52 ) having. Device according to claim 2, characterized in that the / each brush ( 22 ) of the first grinding device ( 12 ) and the vacuum suction devices ( 20 ) of the first turntable ( 16 ) are driven in such a way that at the respective contact surface between the brush ( 22 ) and the flatware to be ground ( 58 ) opposite tangential speeds occur. Apparatus according to claim 1, characterized in that the first turntable ( 16 ) a feed conveyor ( 34 ) for the flatware to be ground ( 58 ) assigned. Apparatus according to claim 4, characterized in that the rotating vacuum suction devices ( 20 ) on the first turntable ( 16 ) are provided in groups. Device according to one of claims 2 to 6, characterized in that the rotating brushes ( 22 ) of the first grinding device ( 12 ) are provided in groups. Apparatus according to claim 7 characterized gekenn characterized in that the rotating brushes ( 22 ) of the various brush groups of the first grinding device ( 12 ) have different grinding properties. Apparatus according to claim 1, characterized in that the second grinding device ( 14 ) at least one rotating brush ( 40 ) having. Apparatus according to claim 9, characterized in that the / each brush ( 40 ) of the second grinding device ( 14 ) and the vacuum suction devices ( 38 ) of the second turntable ( 18 ) are driven in such a way that at the respective contact surface between the brush and the flatware to be ground ( 58 ) opposite tangential speeds occur. Apparatus according to claim 1, characterized in that the rotating vacuum suction devices ( 38 ) on the second turntable ( 18 ) are provided in groups. Device according to one of claims 9 to 10, characterized in that the rotating brushes ( 40 ) of the second grinding device ( 14 ) are provided in groups. Device according to claim 12, characterized in that the rotating brushes ( 40 ) of the different breast groups of the second grinding device ( 14 ) have different grinding properties.