EP0816031A1 - Device for grinding the two opposed sides of stone blocks - Google Patents

Abstract

A horizontal continuous conveyor carries the stones along during their machining. Above the conveyor is a holder (3) holding down the stones on the conveyor. On both sides of the conveyor are grinder discs (4). At least two spaced apart parallel synchronously moving narrow conveyor elements (6) carry the stones forward. The conveyor elements have a side guide to prevent lateral deflection. The space between the conveyor elements and between the grinders is adjustable. The conveyor elements run over two deflector rollers (12). The inside of the conveyor elements have inward protruding strips, arms or protuberances.

Description

The invention relates to a device for grinding on both sides of stones or artificial stones, in particular of bricks or Stone blanks, i.e. also unfired stones, or of refractory Stones or the like, in particular ceramic components especially with plane-parallel side surfaces, with an as horizontal endless conveyor trained means of transport on the the stones during their processing - parallel to theirs grinding side surfaces - arranged and movable forward are, with a hold-down for Press the stones on the means of transport and to fix them during the feed movement and processing and on both sides of the means of transport and the transport path of the stones, grinding tools, in particular grinding wheels are arranged on which the stones can be moved past during processing.

Such a device or machine is from DE-OS 20 08 265 known. This makes it possible to use stones of the same width Continuous flow system on two parallel side surfaces simultaneously grind and bring it to an exact size. As A conveyor belt is used as a means of transport over its longitudinal edges the blank to be machined protrudes slightly from the side. As Grinding wheels serve so-called cut-off wheels, in which the grinding surface is arranged at right angles to the axis of rotation. By The hold-downs are the stones or stone blanks to be processed pressed on this conveyor belt, so that the feed despite of the resistance emanating from the grinding tools is possible.

Because such workpieces, especially bricks, not always very much are worked precisely, they often result in an uneven surface Support surface, that is, the support surface is in many cases crowned and / or warped. This results in the disadvantage that the spherical surface of the workpiece to an inclined position of the workpiece can lead on the conveyor belt, so that the actually rectangular to the contact surface standing and to be machined can be ground at an impermissible angle.

There is therefore the task of a device of the beginning to create the type mentioned, in which an edition of stones with a vertical arrangement of the side surfaces to be cut is possible if the surface to be placed on this stone or Blank is inaccurate, in particular crowned and / or warped.

To solve this problem is the device mentioned characterized in that as a means of transport for the feed at least two spaced parallel, synchronous movable narrow transport element for taking up their distance bridging stones are provided that these transport elements are supported in their supporting area and that they are a Have side guides to prevent lateral deflections.

Due to the apparent additional effort with two parallel narrow Transport elements have the considerable advantage that the capturing stones only in their two parallel ones Edge areas are gripped and worn so that in between existing inaccuracies of the lower contact surface do not become one Guide the stones on their means of transport. Convex Find deviations of the contact surface in particular downwards space between the two narrow transport elements, so that the Stones exactly with their side surfaces to be machined aligned can be fed to the grinding wheels themselves if there are significant inaccuracies on the underside.

In addition, the use of two according to the invention enables transport elements arranged parallel to each other, each and also together a smaller width than the one to be processed Stone have a particularly advantageous design option of the invention, which is that the distance between the two parallel transport elements to each other and the distance of the Grinding tools are adjustable. This makes it possible Changes in the width of the workpieces easily consider. With such a device or machine can be stones or blanks of very different widths on one each desired dimension can be ground, what with a single Conveyor belt with a fixed width, if at all, in very little Scope would be possible. It is known that it is mainly bricks different dimensions there because of the adjustability of the transport elements and the grinding wheels all nevertheless can be processed with the same device.

A simple design option is that to change the distance of at least one of the transport elements and a grinding tool adjacent to or associated therewith are adjustable to the feed direction. So it can vary One of the two parallel transport elements is sufficient together with the associated grinding tool or tools to adjust the distance between the transport elements and adapt and change the grinding tools as necessary.

For processing stones of different distances between the two parallel surfaces to be ground can be advantageous be when facing the transport elements and the grinding tools a longitudinal median plane located between them is preferred each by the same amount transversely to the feed direction from each other way and towards each other, in particular mirror-symmetrical, adjustable are. This can be achieved that the grinding tools from the longitudinal center plane together with the transport elements in each case can be adjusted sideways to different stone dimensions to consider. Above all, can be achieved that the grinding tools from the longitudinal median plane and thus the In the middle of the stone to be worked the same adjustable Have a distance, so that the grinding and processing of the two parallel side faces of such a stone to one the longitudinal median plane leads to symmetrical shape and dimensions. At the same time, the advantage remains that a crown the bottom of each workpiece does not become an unstable Edition leads because the transport elements are adjusted in this way that the crowned area of the workpiece is arranged essentially between them.

For high precision when feeding stones or workpieces it is useful if the transport elements each have two Deflection rollers or rollers guided and at least one of these Deflection rollers are driven conveyor chains that run on their rotating Outside in particular with an elastic pad if necessary surface profiling to increase friction the stone on top. A conveyor chain can be proportionate be narrow and still have relatively high weight take over, so that conveyor chains are particularly well suited as two parallel transport elements to the stones to be ground reach under and carry. At the same time, they allow precise Movement and easy support using rails when the conveyor chains are roller chains. If you have an elastic pad if necessary with surface profiling, the each stone transported was not only guided exactly, but through the hold-down also set so that no grinding Slip against the feed movement occurs.

It is important for a precise processing of the two each other opposite parallel side faces of a stone or Blanks that no lateral deflections of the means of transport or the transport elements can occur. Even minor Sideways movements, for example, due to a slightly different one Grinding pressure of one grinding wheel against the others would no longer tolerate dimensional deviations on one cut stone. It is therefore useful if the transport elements or conveyor chains projecting inwards on their inside Have projections or webs that are at least in the by a Guide rail-supported support area are guided laterally, especially in a groove-shaped longitudinal guide of these guide rails intervention. This can rule out that in the supporting area between the grinding wheels Conveyor chain is deflected laterally and / or downwards, so that during the ongoing processing of the stone one maintains a very precise and exact position relative to the grinding wheels.

It is for the smoothest possible movement advantageous if the groove-shaped longitudinal guides for the Webs arranged on the inside of the conveyor chain provide a lining for Have example made of plastic. On the one hand, this results in an exact lateral guidance and on the other hand less friction than if metallic projections, webs or tabs in a metal rail have to be moved. Also can be generated by the grinding process Vibrations or the like are dampened in this way on the guide will.

A particularly useful constructive implementation of the invention can consist of two side by side on a machine bed arranged stands are provided, each one of the Transport elements and a grinding tool carries, and that this Stand for changing the distance transverse to the feed direction relative to each other, for example, via a spindle drive or the like are adjustable on guides of the machine bed. This results in a very simple adjustment of the grinding tools and the Transport elements away from or towards each other by simple the two stands are pushed further apart or closer together can be. The corresponding adjustment movements take place exactly at right angles to the feed direction. Because the axes of the Align grinding wheels with each other and at right angles to Feed direction are arranged by the displacements the two stands in opposite directions Grinding wheels apart or moved together, but keep theirs aligned position so that the grinding pressure on between them processed stones regardless of their dimensions can be neutralized. Above all, it is ensured that the Transport elements and the grinding tools simultaneously on the respective dimension of a stone to be machined not individually on different sized stones have to be adjusted.

For pressing the stones onto the transport elements or Conveyor chains can be held down in the middle be enough. However, it is particularly advantageous if the Hold-down device made of two parallel hold-down elements or Printing parts is formed, which is an endless belt in the feed direction with its lower run at the top of one or more revolve processing stones at feed speed. With only A hold-down could cause problems if the two Stand can be adjusted in distance because of the hold-down device expediently would have to remain on one of the stands so that then he may no longer attack exactly in the middle and thus its pressure force no longer evenly on both transport elements would transfer. Two parallel hold-down elements now enable their effect on the two transport elements to transfer, resulting in an exact clamping of the passing stone during its passage. Especially It is advantageous if vertically above one Transport element a hold-down element is arranged. The for Define the compressive force of the respective hold-down element is then directly vertically from top to bottom in the Transport element initiated.

It is especially useful for a device or machine which the distance of the transport elements to adapt to different sized stones is adjustable, advantageous if the hold-down elements with the transport elements across Feed direction relative to each other to change their mutual distance are adjustable. This then leaves the Get advantage that the hold-down elements each in constant relation to the transport elements arranged remain, even if their distances are adjusted. The easiest this can be achieved in that the two hold-down elements are each mounted on one of the stands, which also carries a grinding tool and a transport element.

There is a certain problem with such a grinder or grinding machine with between at least two around horizontal Shafts rotating grinding wheels and passing through between them Stones in that the successive stones with respect to their Height may vary somewhat from their edition. So now alongside a slightly higher stone also a lower stone of that Hold-down grips and on the respective transport element sufficient downforce can be pressed down be designed as endless chains, the Presses the lower strand on the top of the stone and on the Has an elastically flexible intermediate layer on the inside preferably between one that applies the hold-down force Pressure bar and one that acts directly on the chain Slider is arranged. Thus, the hold-down elements a certain approximately vertical flexibility built in, the one Adaptation to different heights allowed. This as a hold-down element serving chain can give way over short distances, so that height tolerances of the workpieces or stones are compensated are, but still these stones on the machining grinding wheels drove past, pressed against the transport elements and flawlessly and with no avoidance with great precision can be edited. The elastic, flexible intermediate layer can be foam rubber, a compressed air hose, springs or the like.

The two hold-down elements can each in the vertical direction individually resiliently supported against a restoring force. Thereby is an even better adjustment to the irregularities of the processing stones possible.

The driven deflection rollers for the hold-down elements can be coupled with one another via a cardan shaft and one have a common drive motor. The cardan shaft allows something different height arrangements of the two hold-down elements depending on the dimensions of the stones to be machined without a synchronous drive of both hold-down elements with the help of a single drive motor must be dispensed with. Here is in Transversely a sliding sleeve expedient, with which the lateral adjustment of the two hold-down elements when changing the distance between the grinding wheels can be carried out.

The two separate stands can face a longitudinal median plane of the entire device or machine in stages or continuously be adjustable. An adjustment in stages is then sufficient when workpieces of different widths are processed one after the other should be and these widths and thus the adjustable distances are specified. A stepless adjustability allows one Adaptation to any dimensions of stones to be processed regardless of any given dimensions, including that Processing of special sizes.

The transport elements can each be double roller chains, the one in the processing and transport area Guide rail run, with the respective upper contact surfaces the transport elements can be arranged at the same height. This means that the load-bearing capacity can also be maintained for large stones at the same time several arranged one behind the other in the feed direction Stones are raised.

An expedient embodiment of the invention can consist in that the transport elements are designed as cam chains those on the outside in particular at equal intervals and on protrude the same height cams, so that the cross of the cams back of a stone acted on in the direction of advance is arranged at right angles to the feed direction. In this way It is possible to machine workpieces with two or three sides must be perpendicular to each other or where the width exceeds the pass length.

It is advantageous if the cams for adjusting the Angularity adjustable in the longitudinal direction of the transport elements are. Thus, inaccuracies in the transport elements and / or the stones are balanced so that the stones with the to grinding surfaces exactly at an angle to that on the cams supported surface are arranged.

It is particularly favorable if the cams are in two parts are formed and their upper part relative to that with the chain connected holding part is adjustable in the feed direction. The Attachment of the cam to the chain can then remain unchanged remain and yet the effective surface of the cam with which this can strikes a stone, in the feed direction and in the opposite direction are adjusted and adjusted.

The device according to the invention can not only with a pair of two facing grinding wheels work, but in Feed direction one behind the other can also be several Grinding tools and grinding wheels each arranged in pairs be, so that then the first pair of grinding wheels in the feed direction does a pre-grinding while with the next pair of grinding wheels an even stronger grinding can be carried out can. Such a gradual grinding in the feed direction is especially advantageous when there is a large amount of grinding to be performed with a single grinding operation cannot be achieved in one pass.

Overall, there is a grinding machine for processing parallel surfaces of stones or stone blanks, one Machining with high precision allowed, even if the contact surface of the stone is spherical or inaccurate and where the Possibility is a constructive and easy to use easy adaptation to different dimensions of the stones carry out because the means of transport for the stones in Feed direction is not a single wide conveyor belt, but by at least two narrow and spaced apart transport elements is formed, the distance between which can be made adjustable and between which a spherical or irregular contact surface of a Stone is not supported, so not to tilt the Stone can lead.

Fig.1

eine Seitenansicht einer Vorrichtung oder Maschine zum gleichzeitigen beidseitigen Beschleifen von Steinen mit zwei spiegelsymmetrisch angeordneten Schleifaggregaten, deren Schleifscheiben auf jeweils miteinander fluchtenden horizontalen Antriebswellen angeordnet sind, zwischen denen zu beschleifende Steine auf einem horizontalen Endlosförderer mit Obertrum und Untertrum in Vorschubrichtung hindurchbewegbar sind, wobei ein oberhalb der Steine befindlicher Niederhalter die Steine an den Endlosförderer andrückt,

Fig.2

eine Draufsicht der Vorrichtung gemäß Fig.1 mit einer Draufsicht auf zwei beabstandete Niederhalterelemente, die ihrerseits oberhalb zweier als Transportmittel dienender beabstandeter Transportelemente angeordnet sind, so daß davon erfaßte Steine jeweils in der Mitte ihres Auflagebereiches freiliegen,

Fig.3

eine Draufsicht der Vorrichtung ohne die Schleifaggregate, wobei zwei beabstandete, nebeneinander angeordnete Ständer erkennbar sind, die jeweils ein Schleifaggregat, eines der Transportelemente und eines der Niederhalterelemente tragen und mittels einer quer verlaufenden Spindel in ihrem Abstand verstellbar sind,

Fig.4

eine Draufsicht des die Ständer tragenden Maschinenbettes mit parallelen Führungen zum Verstellen der beiden Ständer quer zur Vorschubrichtung, der Steine und mit einer Draufsicht auf die Verstellspindel zum gleichzeitigen gegensinnigen Verstellen der beiden Ständer mit Hilfe von gegensinnigen Gewindeabschnitten an der Verstellspindel,

Fig.5

eine Stirnansicht der erfindungsgemäßen Vorrichtung mit dem Maschinenbett und den beiden darauf quer zur Vorschubrichtung voneinander weg und zueinander hin verstellbaren Ständern, die jeweils ein Transportelement und ein Niederhalterelement tragen, wobei die Schleifaggregate der besseren Übersicht wegen weggelassen sind,

Fig.6

einen Querschnitt der Vorrichtung mit Ansicht auf die Ständer für die Niederhalterelemente, wobei zwischen den Transportelementen und den Niederhalterelementen ein zu bearbeitender Stein gehalten ist,

Fig.7

in vergrößertem Maßstab eine teilweise im Schnitt gehaltene Stirnansicht der beiden Niederhalterelemente und der Kupplung ihrer parallelen Umlenkrollen mit Hilfe einer Doppelgelenk- oder Kardanwelle, deren eines Ende mit einer Schiebebuchse verbunden ist,

Fig.8

einen Querschnitt der beiden Niederhalterelemente und insbesondere ihres Untertrums, das etwas elastisch nachgiebig ausgebildet ist,

Fig.8a

einen Querschnitt der beiden Transportelemente und insbesondere ihres Obertrums mit seiner Unterstützung und Führung im Trag- und Arbeitsbereich,

Fig.9

eine Seitenansicht einer erfindungsgemäßen Vorrichtung ohne die Schleifaggregate, wobei die Transportelemente Nockenketten sind,

Fig.10

in vergrößertem Maßstab eine Seitenansicht und

Fig.11

ebenfalls in vergrößertem Maßstand eine Draufsicht zweier Nockenketten, die mit ihren Nocken an einer quer zur Vorschubrichtung verlaufenden Längsseite eines Steines angreifen, der an den Stirnseiten beschliffen werden soll, sowie

Fig.12

in noch weiter vergrößertem Maßstab einen Längsschnitt durch einen Nocken, der mit einem unteren Halteteil an der Kette befestigt ist und einen in Förderrichtung oder entgegengesetzt dazu verstellbaren Oberteil als Anschlag gegenüber einem Stein hat.

An embodiment of the invention is described below with reference to the drawing. It shows in a partially schematic representation:

Fig. 1

a side view of a device or machine for simultaneous grinding of stones on both sides with two mirror-symmetrically arranged grinding units, the grinding wheels of which are arranged on horizontal drive shafts that are aligned with each other, between which stones to be ground can be moved on a horizontal endless conveyor with upper run and lower run in the feed direction, one above the hold-down located on the stones presses the stones onto the endless conveyor,

Fig. 2

1 shows a top view of the device according to FIG. 1 with a top view of two spaced-down hold-down elements, which in turn are arranged above two spaced-apart transport elements serving as transport means, so that stones captured therefrom are each exposed in the middle of their support area,

Fig. 3

3 shows a plan view of the device without the grinding units, two spaced stands arranged next to one another being recognizable, each of which carries a grinding unit, one of the transport elements and one of the hold-down elements and the distance of which can be adjusted by means of a transverse spindle,

Fig. 4

1 shows a top view of the machine bed carrying the stands with parallel guides for adjusting the two stands transversely to the feed direction, the stones and with a top view of the adjusting spindle for simultaneous adjustment of the two stands in opposite directions with the aid of opposing threaded sections on the adjusting spindle,

Fig. 5

3 shows an end view of the device according to the invention with the machine bed and the two stands that are adjustable transversely to the feed direction and towards each other, each carrying a transport element and a hold-down element, the grinding units being omitted for the sake of clarity,

Fig. 6

3 shows a cross section of the device with a view of the stands for the hold-down elements, a stone to be machined being held between the transport elements and the hold-down elements,

Fig. 7

on an enlarged scale, a partially sectioned end view of the two hold-down elements and the coupling of their parallel deflection rollers with the help of a double joint or cardan shaft, one end of which is connected to a sliding bush,

Fig. 8

2 shows a cross section of the two hold-down elements and in particular their lower run, which is designed to be somewhat resilient,

Fig.8a

a cross section of the two transport elements and in particular their upper run with its support and guidance in the carrying and working area,

Fig. 9

2 shows a side view of a device according to the invention without the grinding units, the transport elements being cam chains,

Fig. 10

on a larger scale a side view and

Fig. 11

likewise on an enlarged scale, a top view of two cam chains, which engage with their cams on a longitudinal side of a stone which runs transversely to the feed direction and which is to be ground on the end faces, and

Fig. 12

on an even larger scale, a longitudinal section through a cam which is fastened to the chain with a lower holding part and has an upper part which is adjustable in the conveying direction or opposite thereto as a stop against a stone.

A device or machine designated as a whole with 1 serves for simultaneous grinding of parallel side surfaces on both sides of stones 2, which are also artificial stones or bricks or Stone blanks, for example unfired bricks, can be.

This device 1 has a horizontal endless conveyor trained means of transport to be described in more detail below, on which the stones 2 with their underside during their Machining are arranged and supported and by means of which they in the feed direction indicated by the arrow Pf1 can be moved forward by the device 1. Above the The means of transport is a hold-down device designated as a whole by 3 to press the stones 2 on the means of transport and to fix them provided during the feed movement and processing and on both sides of the means of transport and the route of the stones 2 are grinding tools, in the exemplary embodiment grinding wheels 4 arranged with their drive motors 5, on which the Stones 2 can be moved during their processing, the Grinding wheels 4 then the parallel side surfaces to be machined the stones 2 act and by a required amount remove. In the exemplary embodiment, these are grinding wheels, the one with its rotating, perpendicular to the drive axle Arrange arranged surfaces and face each other as a pair are arranged.

Especially from Figures 6 and 8a you can see that as the stones 2 supportive from below and in the feed direction forward moving means of transport two parallel at a distance Narrow transport elements that can be moved synchronously to one another 6 are provided, the distance between each of the stones 2nd is bridged. These transport elements 6 are in their carrying area each supported and have a side guide to be described to prevent lateral deflections. So if the Place on the bottom 2a of the stone that serves as a means of transport 2 crowned or warped, this does not lead to tilting of the stone 2, but usually in the middle of the Bottom 2a most pronounced irregularities between the two transport elements 6, where they are harmless stay.

Based on Figures 3 and 4 it is indicated that the distance between the two parallel transport elements 6 to each other and thus also the distance the grinding tools 4 is adjustable, the parallelism of the Transport elements 6 and the position of the grinding tools 4 relative apart from each other - apart from their distance - remains the same. This happens that separately on a in Figure 4 in plan view shown machine bed 7 two juxtaposed stands 8 are provided, which can be seen in a top view in FIG. Everyone this stand 8 carries one of the transport elements 6 and Grinding tool 4 with its drive, which is better in Fig.3 Overview is not shown, but can be seen in Fig.2. These two stands 8 can be used to change the distance across Feed direction relative to each other, in the embodiment above a spindle drive 9 with a spindle with two opposite directions Threads on guides 10 of the machine bed 7 can be adjusted. One recognizes above all when looking at the figures at the same time 4 and 6 that the guides 10 are perpendicular to the feed direction of the transport elements 6 are arranged. With a simple one Adjustment movement with only a single servomotor 11 for the Spindle drive 9 can thus the transport elements 6 and Grinding tools 4 compared to one located between them imaginary median longitudinal plane by the same amount across Feed direction away from or towards each other will. This is a convenient and effective adjustment to processing stones 2 different width dimensions possible, without having to accept the precision of the machining.

An embodiment would also be possible, however, in which Changing the distance between the transport elements 6 and the grinding tools 4 only one of the transport elements 6 and one or, if necessary, several neighboring and associated with it Grinding tools 4 are adjustable transversely to the feed direction, while the other transport element 6 and the or the associated Fixed grinding elements 4.

The transport elements 6 are in each case over two Deflection rollers or rollers 12 guided and at least one of these Conveyor chains driven by deflection rollers, in particular roller chains, which enable very precise feed and transport and allow a high load at the same time. To increase the frictional force compared to the stones 2 to be machined, they also have their an elastic support 13 all around the outside (see Fig. 8a), which, if necessary, also with a profiling of its surface to further increase the friction compared to the stones on top Can have 2.

The transport elements 6 or conveyor chains can already be for your mentioned lateral guide to prevent lateral deflections according to 8a, 10 and 12 on their inside protruding projections, Have tabs or webs 14, at least in the by one Guide rail 15 supported support area on the upper run of the Transport elements 6 are guided laterally, for example in a engage groove-shaped longitudinal guide of these guide rails 15, such as it is indicated in Fig. 6 and 8a. For example, the Guide rail 15 have a U-shaped cross section, so that the Tabs or webs 14 from above between the U-legs such guide rail 15 can engage while the edges the U-leg is the conveyor chain designed as a roller chain support. The groove-shaped longitudinal guides can be used for the webs 14 arranged on the inside of the conveyor chain 6 a Lining 15a, for example, made of plastic to avoid vibrations to dampen during grinding, which also includes already mentioned edition 13 can contribute.

For pressing the stones 2 to be machined onto the transport elements 6 a single hold-down device 3 could suffice. In the embodiment However, it is provided that the hold-down device 3 consists of two parallel ones Hold-down elements 16 is formed, each as an endless belt or chain in the feed direction with its lower strand on the top one or more stones 2 to be machined with feed rate and revolve in the feed direction. Thus the respective stone 2 between two hold-down elements 16 and two Transport elements 6 firmly clamped, the pressing force is chosen large enough to prevent slippage due to the To prevent grinding resistance.

In Figures 5 and 6 it is clear that each vertically above a holding-down element 16 of a transport element 6 is so that the clamping forces without lateral offset and thus be introduced into the stones 2 without bending stress. The pressure force of the respective can be correspondingly effective Hold-down element 16 on the one immediately below Impact transport element 6.

It can be seen above all in Fig. 6 that the hold-down elements 16 in each case on one of the stands 8 via corresponding supports 17 are stored so that they together with the transport elements 6 transverse to the feed direction relative to each other and to change their mutual distance in particular to adapt to stones different dimensions are adjustable. Besides, they are height adjustable.

FIGS. 7 and 8 illustrate that the hold-down elements 6 are designed as endless chains, whereby this endless circulation with upper run and lower run is also shown in Fig. 1 and 9 recognizes. The lower run presses on the top of the or the stones 2 and has according to Fig.8 on the inside resilient intermediate layer 18, which in the embodiment between a pressure bar 19 which applies the hold-down force and a slide 20 which acts directly on the chain Plastic is arranged. It makes sense that because of this Arrangement in the longitudinal direction of the hold-down elements 16 this can yield in areas, so that they can, for example small difference in height between successive stones 2 can easily compensate, so despite different heights Stones hold them all down with sufficient pressure can.

It may still be useful if the two hold-down elements 16 individually against one another in the vertical direction Restoring force are resiliently stored to also irregularities to balance the stones themselves. That is why they are driven Deflection rollers 21 for the hold-down elements 16 according to FIG a double joint or propeller shaft 22 coupled together, so that they can still have a common drive motor. By a sliding bush 23 is still the relative adjustment to each other possible. The two separate stands 8 can be compared to the Machine bed 7 and a longitudinal median plane in steps or continuously be adjustable.

Especially in Fig.8a and 11 you can see that the transport elements 6 can be double roller chains, each one accordingly higher load and still precise cornering allow because the tabs or webs 14 each between the two Link rows can protrude down, being in the embodiment such a guide bar only on every second chain link 14 protrudes downwards. These double roller chains run each on the already mentioned guide rail 15, the according to FIG each upper contact surfaces of the transport elements 6 on the same Height are arranged so that the stone 2 on the side surfaces exactly is grinded vertically.

Fig. 10 to 12 still shows an embodiment in that the transport elements 6 simultaneously as Cam chains can be formed on the outside project cams 24 at equal distances and at the same height. Thus, a stone 2 can also be placed so that its largest Dimension arranged transversely to the feed direction according to arrow Pf1 is, so that the end faces are ground plane-parallel can be edited before or after the longer side surfaces will. The cams 24 can be used to adjust the angularity between these surfaces arranged at right angles to each other adjustable and adjustable in the longitudinal direction of the transport elements 6 be. A possible way of doing this is shown in Fig.12 shown. Accordingly, the cams 24 are formed in two parts and have a holding part 24a connected to the transport element, relative to which an upper part 24b in the feed direction or opposite is adjustable and fixable. This top 24b forms the stop on the stone 2 in the use position.

The device 1 is used to grind parallel surfaces on stones 2, which can also be blanks like unfired bricks. she For this purpose has two grinding wheels 4, their transverse to their axes of rotation arranged effective grinding surfaces in the use position vertically and are arranged on both sides of the feed path of the stones 2. Of the Feed is effected with endlessly rotating transport elements 6, which have a distance from each other, so that on the support side of the Stone irregularities do not cause them to tip over Lead stones. Hold-down elements 16 are in the same way intended. This also enables the distance to be adjusted the transport elements 6 and the grinding wheels 4, so that a Adaptation of the device 1 to different sized stones or to the different dimensions, the cuboid stones have, is easily possible.

Claims (20)

Device (1) for grinding parallel side faces of stones (2) or artificial stones, in particular bricks or stone blanks or refractory stones or the like, in particular ceramic components, with a transport means designed as a horizontal endless conveyor, on which the stones (2) are arranged during their processing and can be moved forward, with a hold-down device (3) above the transport means for pressing the stones (2) onto the transport means and for fixing during the feed movement and processing and on both sides of the transport means and the transport path of the stones (2) in each case grinding tools, in particular grinding wheels ( 4) are arranged, against which the stones (2) can be moved during their processing, characterized in that at least two, synchronously movable, narrow transport elements (6), which are arranged at a distance from one another and are parallel to one another and can be used as a transport means for the feed, for receiving their A. bridging bricks are provided that these transport elements (6) are each supported in their carrying area and that they have a side guide to prevent lateral deflections. Apparatus according to claim 1, characterized in that the Distance between the two parallel transport elements (6) and the distance between the grinding tools (4) is adjustable. Device according to claim 1 or 2, characterized in that that to change the distance between the transport elements (6) and the grinding tools (4) at least one the transport elements (6) and one or more of these assigned grinding tools (4) transverse to the feed direction are adjustable. Device according to one of claims 1 to 3, characterized characterized in that the transport elements (6) and Grinding tools (4) opposite one located between them Longitudinal median plane across the same amount Feed direction away from each other or adjustable towards each other are. Device according to one of claims 1 to 4, characterized characterized in that the transport elements (6) each over two guide rollers or rollers (12) guided and over at least one of these deflection rollers driven conveyor chains, especially roller chains that are on their rotating Outside in particular an elastic pad (13) if necessary with a surface profiling to increase the Have friction against the stone (2) on top. Device according to one of claims 1 to 5, characterized characterized in that the transport elements (6) or conveyor chains on the inside protrusions, tabs or have webs (14) which are at least in the by a Guide rail (15) supports the carrying area for the stones (2) are guided laterally, especially in a groove-shaped Intervene in the longitudinal guide of these guide rails (15). Device according to one of claims 1 to 6, characterized characterized in that the groove-shaped longitudinal guide for the webs (14) arranged on the inside of the conveyor chain (6) has a lining, for example made of plastic. Device according to one of claims 1 to 7, characterized characterized in that two on a machine bed (7) side by side arranged stands (8) are provided, each of which one of the transport elements (6) and a grinding tool (4) carries, and that this stand (8) to change the distance transversely to the feed direction relative to each other, for example via a spindle drive (9) or the like on guides (10) of the machine bed (7) are adjustable. Device according to one of the preceding claims, characterized characterized in that the hold-down device (3) consists of two parallel ones Hold-down elements (16) is formed, which form an endless belt in the feed direction with its lower run at the top of a or several stones to be machined (2) with feed speed circulate. Device according to one of claims 1 to 9, characterized characterized in that each vertically above a transport element (6) a hold-down element (16) is arranged. Device according to one of claims 1 to 10, characterized characterized in that the hold-down elements (16) with the Transport elements (6) transverse to the feed direction relative to each other to change their mutual distance are adjustable. Device according to one of claims 1 to 11, characterized characterized in that the hold-down elements (6) are endless revolving chains are formed, the lower strand of which Presses the top of the stone (s) (2) and one on the inside has resilient intermediate layer (18), which preferably between a pressure beam exerting the hold-down force (19) and one that acts directly on the chain Slider is arranged. Device according to one of claims 1 to 12, characterized characterized in that the two hold-down elements (16) in the vertical direction individually against a restoring force are resiliently stored., Device according to one of claims 1 to 13, characterized characterized in that the driven pulleys (21) for the hold-down elements (16) via a cardan shaft (22) are coupled together and a common drive motor to have. Device according to one of claims 1 to 14, characterized characterized in that the two separate stands (8) face each other a longitudinal median plane in steps or continuously adjustable are. Device according to one of claims 1 to 15, characterized characterized in that the transport elements (6) each Double roller chains are used in the machining and transport area run on a respective guide rail (15), whereby the respective upper contact surfaces of the transport elements (6) are arranged at the same height. Device according to one of claims 1 to 16, characterized characterized in that the transport elements (6) as cam chains are formed on which on the outside, in particular in protrude cams (24) at equal distances and at the same height. Apparatus according to claim 17, characterized in that the Cam (24) for adjusting the angularity in the longitudinal direction the transport elements (6) are adjustable. Device according to claim 17 or 18, characterized in that that the cams (24) are formed in two parts and you Upper part (24b) relative to that with the transport element (6) connected holding part (24a) adjustable in the feed direction is. Device according to one of the preceding claims, characterized characterized in that several in succession in the feed direction Pairs of two spaced grinding tools (4) are arranged.

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