WO1997024210A1

WO1997024210A1 - Process for the treatment of surfaces

Info

Publication number: WO1997024210A1
Application number: PCT/EP1996/005851
Authority: WO
Inventors: Olaf Höppe; Peter Reinschütz
Original assignee: Betonwerke Munderkingen Reinschütz GmbH
Priority date: 1995-12-27
Filing date: 1996-12-27
Publication date: 1997-07-10
Also published as: EP0873227A1; DE19548932A1; DE59607695D1; ATE205436T1; EP0873227B1

Abstract

The invention relates to a tool for the treatment of flat stone and concrete surfaces, which comprises two impact shafts (10) driven in counter-rotation and supporting impact chains (11) which strike the surface of the stones (32) transported under the rotating impact shafts by a conveyor. Said conveyor comprises three conveyor belts (22, 24, 26) arranged downstream of each other and operating at intermittently different speeds. The stones are pushed through, while closely packed together, under the rotating impact shafts.

Description

Surface treatment device

The invention relates to a device with a tool for processing flat rock and concrete surfaces according to the preamble of claim 1.

Such tools for processing the surfaces of materials, in particular stone and concrete goods, are widely known. A rough distinction is made between whether the devices are intended to create a uniform, uniform surface structure or a patterned surface structure. In the case of a patterned surface, it is usually the incorporation of grooves and grooves using impact tools, as are known from DE-PS 622110, DE-OS 1909193, US-PS 3575155 and US-PS 38585761. Striking tools for processing surfaces in order to produce a surface structure that is as constant as possible are known from US Pat. No. 3,380094 and DE-GM 9006049.

Another device for processing flat rock and concrete surfaces with impact tools is known from DE-OS 4142396, with which the effect of a bushhammered surface is to be achieved. However, it has been shown that the effect of a bush hammered surface is achieved only unsatisfactorily, since the rotating striking tool provided with chains has an undesirable directional effect, which can be recognized from the finished product. Another disadvantage of this striking tool, which is also a result of the directional effect, results from the fact that the leading edge of the stone breaks out completely differently than the trailing edge and also the side edges of the stone struck by the striking chains show a different fracture pattern. The invention has for its object to provide a striking tool of the type mentioned, with a directional effect and uneven chipping edges is avoided. Care should be taken, in particular when working on small surfaces such as paving stones or the like, that all edges delimiting the surface are knocked out evenly.

This object is achieved in that two counter-driven shock waves provided with the impact chains are used, that the conveyor consists of three series-connected and at least at times different speeds running conveyor belts, and that the stones are packed tightly under the rotating, with the shock waves provided with the impact chains are displaceable.

In order to ensure that the stones to be machined are shifted tightly packed under the shock waves, one embodiment of the invention provides that the three conveyor belts consist of a feed-side infeed conveyor belt, a middle machining conveyor belt and a removal conveyor belt, that the middle machining conveyor belt has a constant Transport speed is running so that the infeed conveyor belt can be switched between a speed corresponding to the transport speed of the processing conveyor belt and a higher rapid speed.

In order to ensure that the individual stone packages placed discontinuously on the conveyor device are pushed together on the processing conveyor belt to form a densely packed sequence of stones, the invention provides that a light barrier is attached to the processing conveyor belt which detects a gap in the stones supplied to the shock waves and to the Control of the feed conveyor belt gives a control pulse that switches the feed conveyor belt to rapid speed until the stones are transported close to each other again to the shock waves. The switch back from rapid speed to normal

Transport speed happens in that the control pulse Counter starts, which counts the transport distance corresponding to a stone layer width that has been deposited and then switches the rapid speed of the feed conveyor belt back to the low normal transport speed and releases the new loading of the feed conveyor belt.

Another measure of the invention provides that a further light barrier is provided in the upstream area of the take-off conveyor belt, which scans the stone layer running onto the take-up conveyor belt and emits a control pulse to a counter on the processing conveyor belt which, as soon as the number of stones corresponding to a stone layer width, is pushed onto the take-off conveyor belt is, the take-off conveyor belt switches to a rapid speed in order to transport the stone layer closed against a contact rail and to cause the stone layer to be removed from the conveyor belt.

So that it is also ensured that the stones lying on the respective outer edge experience a uniform edge processing and do not have to be sorted out as a second choice, the invention further provides that guide rails are attached on both sides of the conveyor belts, which in the processing area under the shock waves Wear a height-adjustable guide rail. The upper edge of the guide bar can be adjusted to a height between 5 mm and 10 mm below the surface level of the stones.

An advantageous embodiment also provides that the guide rails in the area of the feed conveyor belt are designed as push rails with which the stones can be displaced in stone layers lying close to one another laterally.

In order to ensure that the processed stones can be gripped in closed stone packages, the invention provides that the removal conveyor belt is provided at the end on the removal side with a transverse and height-adjustable stop rail, on which the stones each run in closely adjacent stone packages, and that the stop rail can be pushed away from the gripper when gripping a stone package. To ensure that the pallets required for packaging are available on the removal side, a chain conveyor runs under the conveyor belts according to the invention, which transports the empty stone pallets from the loading side to the delivery side, the chain conveyor always moving an empty pallet into the loading position when a loaded pallet has been removed.

For easy handling of the shock waves and quick retrofitting, the invention provides that the shock waves consist of a cylindrical tube with a relatively large diameter, onto which rings are welded at a distance assigned to the chain link size, that along a central circular line with respect to the radial ring width A large number of bores for pushing through steel bars carrying the percussion chains is provided such that a split flange ring corresponding to the rings can be clamped onto the two ends of the tube and clamped onto the tube. Removing and hanging in the percussion chain is simplified in that the steel rods for hanging the percussion chains are divided and can be inserted from both sides through the holes in the rings and the respective flange ring, the inner ends being able to mesh with one another lying on a gap, and in that the percussion chains in a repeated distribution pattern are hung in the steel rods. When hanging up percussion chains of relatively large length, with which a soft percussion pattern can be achieved, tangling of the chains is avoided in that the percussion chains are each hung on the steel rods with a free ring spacing. This measure is supported in that the percussion chains are hung from the steel rod to the steel rod lying on a gap.

It has proven to be particularly advantageous for achieving a uniform surface impact structure if the impact chains are attached to the two counter-rotating impact shafts in a same arrangement and distribution pattern with repeating repetition, and that each revolution of the impact wave has an equal number of Chains hit the stone surface in the same pattern. In the event that a structured impact pattern is to be achieved, it is provided that the impact patterns of the individual impact waves are different, or that the impact patterns of the individual waves are offset from one another.

The advantages and features of the invention also result from the following description of an exemplary embodiment in conjunction with the claims and the drawing. Show it:

Figure 1 is a schematic side view of a shock wave together with a right and left side end view.

Figure 2 is a schematic view of a device for processing flat rock and concrete surfaces according to the invention.

3 shows a schematic development of two shock waves to generate a uniform beat pattern;

Fig. 4 is a schematic development of two shock waves to generate a structured beat pattern.

In Fig. 1, a shock wave 10 is shown together with two front views shown on the right and left thereof. The shock wave consists of a cylindrical tube 12 with stub axles 13 attached to both sides. Rings 14, which are preferably welded onto the cylindrical tube, are attached to hold impact chains 11 over the axial length of the cylindrical tube 12. At the two front ends, a split clamping ring 15 is also placed, which can be fixed on the cylindrical tube 12 with a clamping device, not shown. A plurality of bores 18 are provided over the rings 14 and 15 along a central circular line, through which steel rods 19 can be inserted. These steel rods 19 carry the percussion chains 11 (not shown in FIG. 1), only one percussion chain being arranged between two rings 14 during assembly. The steel rods 19 can run over the entire length of the shock wave and end in the fully inserted position within the split clamping rings 15 To hold the operating position and to prevent the steel rods from slipping out, after inserting the steel rods through the aligned bores 18, the outer clamping rings 15 are rotated by a hole width and fixed in this rotated position by tensioning on the cylindrical tube. This ensures easy assembly and a high level of security against the steel rods falling out during operation.

In the case of comparatively long shock waves, correspondingly long steel rods are required in the construction illustrated, which have to be pushed through the rings 14 over the entire length when threading the impact chains. This handling is relatively cumbersome and therefore it is also provided to halve the steel rods and to push them from both sides through the split clamping rings 15 and the further rings 14. In a central region, the steel rods run against one another when the bores 18 are provided in the rings 14 in alignment over the entire shock wave 10. However, it is also provided that the rings 14 on one side of the shock wave are offset relative to the rings on the other side of the shock wave by approximately a diameter of the bore 18, so that the inserted steel rods 19 come to lie in the overlap area.

When loading the shock wave, it is possible to provide a wide variety of arrangement and distribution patterns for the impact chains 11 suspended in the steel rod 19, depending on which surface structure is to be obtained during the processing of the stones. In the event that an identical impact pattern is desired over the entire surface, the same number of impact chains in the same distribution must be suspended in each of the two impact waves, whereby the impact chains can each be suspended in the steel rods with a free ring spacing.

If the percussion chains are in the next following steel rod and at the same time suspended on a gap, a distribution pattern results, as is indicated schematically in FIG. 3. In this representation is a settlement of the two running against each other Shock waves are shown, from which the distribution can be seen. This type of distribution results in a very even and uniform striking pattern over the entire surface of the stones.

If, on the other hand, a striking pattern is desired in which an uneven structure is to be provided on the surface of the stones, then e.g. a distribution as in FIG. 4 is used, in which a uniform structuring, but a streak structuring is achieved by a larger number of striking chains striking the stone surface in certain areas than in adjacent areas during processing. It is obvious that a wide variety of arrangement and distribution patterns for the percussion chains on the steel bars are possible, and accordingly the percussion chains also produce a corresponding number of structures that can be produced.

2 shows the entire structure of the device for processing flat rock and concrete surfaces with a striking tool according to the invention. The device comprises three conveyor belts connected in series, namely a feed conveyor belt 22, a processing conveyor belt 24 and a removal conveyor belt 26. Above the processing conveyor belt 24, the striking tool is arranged in the form of two striking shafts 10 with striking chains 11. The two shock waves rotate in opposite directions to one another and are located at a height-adjustable distance above the machining conveyor belt 24.

The stones 32 supplied in the stack via pallets 30 are gripped in layers with the gripper 34 of a gripper robot 33 and placed on the feed conveyor belt 22. In normal operation, this feed conveyor belt runs at the transport speed of the processing conveyor belt 24 and, as will be explained in more detail below, is to be switched over to a rapid speed in order to push the stones close together onto the processing conveyor belt so that they pass tightly packed under the shock waves. In order to ensure this tight abutment, a light barrier 36 is provided on the one hand, which detects gaps between the stones in the upstream area of the processing conveyor belt 24 and emits control pulses which switch the feed conveyor belt 22 to the rapid speed, so that the stones are shifted against each other and the gaps become conclude.

Since the rapid speed is only required for a certain time for this purpose, it is further provided that the control pulse from the light barrier 36 starts a counter that counts the transport route corresponding to a stone layer width that has been deposited and only switches on the rapid speed for a period corresponding to this route. The feed conveyor belt 22 is then switched back to the low normal transport speed. As soon as the gripping robot 33 determines that there is enough space on the feed conveyor belt 22, a new stone layer is gripped with the gripper 34 and placed on the feed conveyor belt 22.

For an error-free processing of the surface of the stones, it is not only necessary to transport them close together in the transport direction on the processing conveyor belt 24, but also that there are no free gaps in the transverse direction between the stones, in the areas of which the edges can break out when the striking chains are opened. For this purpose, a guide rail 38 is provided, which runs on both sides of the stone layer above the processing conveyor belt into the removal conveyor belt and is designed as a bumper rail 40 in the area of the feed conveyor belt. With the help of this bumper rail 40, the stones can be moved transversely to the direction of conveyance, so that they also run close to one another under the shock waves 10. In the area of the striking tool, a guide bar is also provided on the guide rails 38, which is adjustable in height and whose upper edge is set to a level which is slightly below the surface level of the z-processing stones.

It has been shown that distances between 5 mm and 10 mm below the upper edge of the stones to be processed are to be regarded as the optimal setting, in which the outer edges of the respective outer row of stones are the same Processing is experienced like the edges of the individual stones that lie against each other within a stone layer. This means that surface processing can be carried out almost without rejects, and only small quantities of second-choice stones are left. The height adjustment of the guide bar 42 is necessary because the device is to be used to process stones of different heights, and thus not only the shock waves are set to a correct distance from the processing surface, but also the upper edge of the guide bars to a predetermined distance from the surface of the stones have to.

For the quality of the surface and the surface structure obtained by machining, the distance of the shock waves from the surface plane of the stones is of major importance. For this reason, it is provided that the shock waves are also adjustable in height. Depending on whether a light blow, a strong blow or a rubbing blow is desired, the shock waves should be set to such a height that e.g. only one or two chain links at the end come into contact with the stone surface or three or more and up to about 7 chain links touch the surface, so that the chain links pulled over the surface exert a grinding effect in addition to the impact effect.

When leaving the processing station, the stones still lie on the processing conveyor belt 24 in tightly closed stone layers and are moved from the processing conveyor belt 24 onto the removal conveyor belt 26. The removal conveyor belt runs at the same transport speed as the processing conveyor belt.

A further light barrier 46 is provided on the removal conveyor belt 26, which responds as soon as the front edge of the stones taken into the light barrier. Following this, care must now be taken to ensure that the exact number of stones that are provided for a stone package and that can be gripped by the gripper 34 of a further gripping robot 33 collects during further transport to a stop rail. For this purpose, either the removal conveyor 26 can be switched to a rapid traverse, the light barrier is used to determine when the number of stones required for a stone package has been displaced by the light barrier. Then the take-off conveyor belt is switched back to normal transport speed. This change in speed creates a new gap between the stone package pushed together on the stop rail 48 and the subsequent stones. In this process, an appropriate setting of the light barrier must ensure that the layer width of the stones is taken into account in order to obtain a full stone package.

A further possibility for pushing the stones together to form a stone package that can be gripped by the gripper 34 is that as soon as the first stone is detected by the light barrier 46 after a gap, a counter 50 on the machining conveyor belt 24 is started and one corresponding to the stone size Counts the conveyor route and switches the removal conveyor 26 to the rapid speed for this time. The take-off conveyor belt is thus switched to the rapid speed for exactly the time required to move the stones belonging to a stone package up to the stop 48 and to create a new gap before the take-off conveyor belt 26 is switched back to normal speed. With the help of the counter, it is easy to determine the transport distance required for a given stone width

To count the processing conveyor belt in order to transport the number of stones corresponding to a stone package onto the receiving conveyor belt 26.

When picking up the stone package lying against the stop rail 48, the gripping robot moves the gripper 24 from above over the stone package and at the same time pushes the contact rail 48 downward against spring tension in order to be able to grip the stone package from the side. The stone package is lifted off and placed adjacent to a pallet 30 for subsequent removal.

In order to ensure that a pallet 30 is always available on the output side, the pallets which have become empty on the loading side are placed on one Chain conveyor 52 is pushed, which runs below the processing system and conveys the pallets in sequence to the output side. The chain conveyor is controlled in such a way that a new pallet is brought into the loading position from the chain conveyor whenever a fully loaded pallet is removed on the take-off side. The control is carried out with the help of the gripping robot which detects the unloading and the full loading of the pallet and controls the transport to and from it.

Claims

claims

1. Device with a tool for processing flat rock and concrete surfaces with at least one rotating and height-adjustable shock wave, on the circumference of which a multiplicity of impact chains arranged on rods are interchangeably attached, which, when the tool rotates, onto the surface of the one below the rotating tool hitting stones transported along with a conveyor device, characterized in that two impact shafts (10) driven in opposite directions and provided with the impact chains (11) are used; that the conveyor device comprises three conveyor belts (22, 24, 26) connected in series and running at at least different speeds at times; and that the stones (32) are packed tightly under the rotating shockwaves provided with the impact chains.

2. Apparatus according to claim 1, characterized in that the three conveyor belts consist of a feed-side feed conveyor belt (22), a central processing conveyor belt (24) and a removal conveyor belt (26); that the middle processing conveyor belt (24) runs at a constant transport speed; and that the infeed conveyor belt (22) can be switched between a speed corresponding to the transport speed of the processing conveyor belt and a higher rapid speed.

3. Apparatus according to claim 1 or 2, characterized in that a light barrier (36) is attached to the processing conveyor belt (24), which detects a gap in the stones (32) supplied to the shock waves and to the control of the feed conveyor belt (22) a control pulse there, who switches the feed conveyor to rapid speed until the stones are transported close together to the shock waves.

4. The device according to claim 3, characterized in that the control pulse starts a counter (37) which counts the transport route corresponding to a stored stone layer width, and then switches the rapid speed of the feed conveyor belt (22) back to the low normal transport speed and the new loading of the feed conveyor belt releases.

5. The device according to one or more of claims 1 to 4, characterized in that a further light barrier (46) is provided in the upstream area of the Abnahmefόrderbandes (26), which scans the accumulating stone layer on the removal conveyor and a control pulse to a counter (50 ) on the processing conveyor belt (24) which, as soon as the number of stones corresponding to a stone layer width has been pushed onto the removal conveyor belt, switches the removal conveyor belt to a rapid speed in order to transport the stone layer closed against a contact rail (48) and to initiate the removal of the stone layer from the conveyor belt .

6. Apparatus according to claim 1 and 2, characterized in that on both sides of the conveyor belts guide rails (38, 40) are attached which carry a height-adjustable guide bar (42) in the processing area under the shock waves.

7. The device according to claim 6, characterized in that the upper edge of the guide strip (42) to a height between 5mm to 10mm below the surface plane of the stones (32) is adjustable.

8. Apparatus according to claim 5 and 6, characterized in that the guide rails in the area of the feed conveyor are designed as bumper rails (40) with which the stones can be moved in laterally adjacent stone layers.

9. The device according to one or more of claims 1 to 8, characterized in that the take-off conveyor belt is provided at the take-off end with a transverse and height-adjustable stop rail (48) on which the stones run in each case in closely adjacent stone packages; and that the stop rail can be pressed downwards when gripping a stone package from the gripper (34).

10. The device according to one or more of claims 1 to 9, characterized in that a chain conveyor (52) runs under the conveyor belts, which transports the empty pallets from the loading side to the discharge side, the chain conveyor always shifting a pallet into the loading position when a loaded pallet has been removed.

11. The device according to claim 1, characterized in that the shock waves (10) consist of a cylindrical tube (12) with a relatively large diameter, onto which rings (14) are welded at a distance assigned to the chain link size; that a plurality of bores (16) are provided along a circular line that is central with respect to the radial ring width, for the passage of steel bars (19) carrying the percussion chains; and that on the two ends of the tube (12) a split clamping ring (15) corresponding to the rings (14) can be clamped and clamped on the tube.

12. The apparatus according to claim 11, characterized in that the steel rods (19) for hanging the percussion chains (11) are divided and can be inserted from both sides through the bores (16) of the rings and the respective flange ring, the inner ends lying on a gap interlock;

- And that the percussion chains (11) are suspended in a repeating distribution pattern in the steel rods (19).

13. The device according to one or more of claims 1 to 12, characterized in that the percussion chains (11) are suspended with a free ring spacing on the steel rods (19).

14. The device according to one or more of claims 1 to 13, characterized in that the percussion chains (11) from the steel rod (19) to the steel rod are suspended on a gap.

15. The device according to one or more of claims 11 to 14, characterized in that the percussion chains (11) in two counter-rotating shock waves (10) are hung in a same arrangement and distribution pattern with repeating repeat; and that for each revolution of the shock waves, an equal number of impact chains hits the stone surface with the same impact pattern.

16. The apparatus according to claim 5, characterized in that the striking patterns of the striking chains attached to the two counter-rotating shock waves are different.

17. The device according to one or more of claims 13 to 15, characterized in that the arrangement and distribution patterns of the percussion chains of the individual shock waves are offset from one another.