GB2081779A

GB2081779A - An Apparatus for Coating Milled-off or Peeled-off Road Surfaces

Info

Publication number: GB2081779A
Application number: GB8118977A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-06-19
Filing date: 1981-06-19
Publication date: 1982-02-24
Also published as: GB2081779B; IT8167856A0; IT1145156B; JPS5729705A; FR2485058B1; JPS6254922B2; FR2485058A1

Abstract

The invention relates to an apparatus for reconstituting road surface material comprising a chassis with an engine, and a storage container 8 for the new material arranged in the front area and a blending device 12 arranged behind it, which is fed with the new material via a first conveyor device 10 assigned to said storage container and with the milled-off material via a second conveyor device 13 assigned to a device 17 collecting the milled-off material from the ground, and at least one heating device 21, 22, 23 for heating the milled-off road surface and means for applying the blended coating material. The device collecting the milled-off road surface material from the ground is provided in front of said storage container and said second conveyor device is guided to the rear close by said storage container and spaced relative to the milled-off road surface level. <IMAGE>

Description

SPECIFICATION An Apparatus For Coating Milled-Off or Peeled Off Road Surfaces The present invention relates to an apparatus for coating milled-off or peeled-off road surfaces with a layer, the apparatus comprising a chassis including an own drive engine, on which chassis a storage container for the new material to be applied is arranged in the front area and a blending device is arranged behind it as seen in the direction of motion, which is directly or indirectly fed the new material via a first conveyor device assigned to the storage container and the milled-off or peeled-off material via a second conveyor device assigned to a device collecting the milled-off or peeled-off road surface material from the ground, and at least one heating device for heating the milled-off or peeled-off road surface and means for applying the coating material taken from the blending device and consisting of new material and-milled-off or peeled-off material.

When renewing road surfaces damaged by the influence of the weather and/or a high vehicle density, the road surface to be repaired is, in general, first milled-off or peeled-off by means of a milling or peeling apparatus and subsequently a new road surface is applied by means of a further apparatus of the kind described in the beginning.

The milled-off or peeled-off material of the old road surface is, in general, insofar applied anew as the old milled-off or peeled-off material is intimately blended with the new coating material, which is in a storage container provided on the coating apparatus and subsequently the coating material so blended is applied as the new coating onto the milled-off or peeled-off road underground.

In order to make sure that the new and the old coating combine with one another and the new coating will in this way withstand also greater loads exerted by the rolling traffic, an increased heating of the milled-off or peeled-off underground is necessary prior to the application of the new coating. It is for this reason that the prior art apparatuses for coating milled-off or peeled-off road surfaces are provided with heating devices extending over part of the length of the apparatus.Nevertheless it might happen that particularly in road surfaces, which in the course of their renewal have to be milled-off or peeled-off to a relatively great depth, the peeledoff or milled-off material lying on the road underground covers the underground so tightly and to such an extent that the heating devices provided on the apparatus are no longer sufficient to heat the underground to the desired temperature. In such cases, an additional heating device resting on a chassis is pushed in front of the normal coating apparatus over the milled-off or peeled-off road surface, which of course leads to an increase of the costs per road length unit.

Another possibility of obtaining the temperature necessary for coating the milled-off or peeled-off road surface underground consists in performing the milling or peeling operation and the coating operation immediately one after the other thus employing the heat produced when milling or peeling the road surface for the subsequent coating process. Considering however that the milling or peeling process and the coating process require different velocities per road length unit, the two machines cannot be exploited at an optimum so that this method, too, leads to increased repair costs per road length unit.

Finally, there would be a possibility to enlarge the coating machine for the heating area required.

This however has the disadvantage that an excessively long apparatus will result, for the transport of which from one place of destination to the other, be it by semitrailer or by its own power, a special travelling permit will be necessary, which has to be applied for by the respective authorities. This has an extremely unfavourable effect on the mobility and hence the applicability of the apparatus.

It is therefore the aim of the invention to so improve an apparatus for coating milled-off or peeled-off road surfaces of the kind described in the beginning that it may also be used when coating road surfaces milledoff or peeled-off to a relatively great depth without the use of an additional movable heating device and that with the aid of it a constant compound of old and new road surface withstanding also greater loads of the rolling traffic may be obtained.

Starting from the apparatus of the kind described in the beginning, this problem is solved in accordance with the present invention in that the device collecting the milled-off or peeled-off road surface material from the ground is provided in front of the storage container as seen in the direction of motion and the second conveyor device assigned to the collector device in guided to the rear close by the storage container and spaced relative to the milled-off or peeled-off road surface level.

By this measure it is reached that the area on the chassis provided for the heating devices is increased without substantially increasing the total area and hence the length of the apparatus.

In other words, by the measure of the invention, the area on the apparatus available for the heating devices is increased while the manoeuvrability and seviceability is not impaired in any way. In this connection, it should be noted that by arranging the collector device in front of the storage container and of the convayor device assigned to the collector device tightly by the side, or under, respectively, the storage container, the position of the latter is not changed, which means that it may, as before, without any difficulties be fed from a truck and does not blur the truck driver's view. A particular advantage of the solution according to the invention is seen in that it may also be applied in apparatuses already in operation, where only a few alterations are necessary.

In a preferred embodiment of the invention the conveyor device assigned to the collector device is guided to the rear at the side of the storage container. Such an embodiment is of advantage particularly in a case when the storage container provided on the chassis extends relatively deep to the ground, that is that only relative little space is left between the bottom of the storage container and the milled-off or peeled-off road level.

Particularly in the latter embodiment it is advisable to provide a collector device collecting the milled-off or peeled-off material and conveying it to the side and to design the conveyor device as a worm conveyor including a worm conveyor operating in a tube. A system including such a conveyor device and such a collecting device may particularly compactly and space savingly be arranged on the coating machine.

It has shown to be suitable to design the collector device transporting the peeled-off or milled-off material to the side as at least one worm conveyor having a spiral walk running in one direction over the total length. Instead of such a worm conveyor a collector device may as well be employed, which includes only guiding or pushing sheet metals; such a collector device however has the disadvantage relative to the one described above that when conveying, the milled off or peeled-off material is not extensively crushed at the same time, which is the case in a worm conveyor.

In order to also remove milled-off or peeled-off material of smaller fractional size as extensively as possible from the milled-off or peeled-off underground and so to increase the efficiency of subsequently following heating devices, it is advisable to provide behind the worm conveyor as seen in the direction of motion a rotating roller steel brush oblique relative to the worm conveyor such that the milled-off or peeled-off material of smaller fractional size is conveyed from the brush to the end of the collector device at the side of the conveyor device.

In accordance with another advantageous embodiment of the invention, the conveyor device assigned to the collector device is guided to the rear under the bottom of the storage container.

Such an embodiment has the advantage relative to the above-described one that it may be built more cost savingly so that it will always be used when, as is generally the case, between the storage container and the milled-off or peeled-off road level a sufficiently great space is left, which permits the arrangement of the conveyor device as well as a heating device provided under it. A further advantage of this embodiment relative to the one described above is seen in that it does not influence the width of the vehicle, which might be the case in the above-described embodiment.

It has shown to be suitable to provide in such an embodiment of the invention a collector device collecting the milled-off or peeled-off material and transporting it to the middle and to design this conveyor device as a belt conveyor. The use of a collector device transporting the material to the middle and of a belt conveyor permits a structure having a particularly small height, which for instance would not be the case with a worm conveyor and a collector device transporting to the side.

The collector device transporting the peeled-off or milled-off material to the side includes advantageously at least one worm conveyor including two opposite spiral walks each extending about half of the length of the worm conveyor. Two individual worms arranged either coaxial or axial parallel relative to each other may selfevidently be employed as well. Such a solution however is more costly and that is why it should be employed only in special cases for instance if an increased grinding effect of the worm(s) is desired.

In order to be able to also remove, also in case of this embodiment, the milled-off or peeled-off material of smaller fractional size from the milledoff or peeled-off road surface, two roller steel brushes are most suitably provided behind the worm conveyor as seen in the direction of motion, which roller steel brushes rotate under an angle relative to each other such that the milled-off or peeled-off material of smaller fractional size is transported by the brushes to the middle of the collector device.

The collector device may directly be secured to the chassis of the apparatus or, which is more advantageous for constructional reasons, directly to the storage container.

In order to secure a perfect and extensive removal of the milled-off or peeled-off material from the road surface underground at any milling or peeling depth, it is advisable to make the collector device height-adjustable. This may be obtained in that the collector device is secured, via a corresponding lifting system, to the storage container or in that the collector device is rigidly secured to the storage container and the storage container is height-adjustably secured to the chassis.Considering that, in general, the storage container is height adjustably pivoted to the chassis in order to swing it up from the road level area during pure travelling operation of the apparatus, that is when it is travelling from oneplace of destination to the other, and thus obtain an improvement of the manoeuvrability of the apparatus, the second solution which is to rigidly secure the collector device to the storage device has the advantage that an additional lifting system for the collector might be dispensed with.

Because in case of milled-off or peeled-off road surfaces the milled-off material is frequently distributed in greater pieces on the road surface, it is particularly advantageous in accordance with a further advantageous embodiment of the present invention if the outer periphery of the spiral walks of the worm conveyor is provided with milling chisels.

The worm conveyor extends suitably over the total width of the milled-off road surface so that with the aid of such an embodiment the whole material may be lifted up and if necessary be crushed by the milling chisels in one operation.

The kind of milling chisels which are arranged on the worm conveyor may be of any sort. It has shown to be particularly suitable to use cylindric chisels which are inserted into bores radially provided in the worm conveyor and retained therein with the aid of a snap ring.

It is particularly suitable if behind the worm conveyor, as seen in the direction of motion, a shield or mantle supporting on the milled-off road surface is provided. This increases the conveying efficiency of the worm on one hand and substantially improves the crushing effect of the worm.

It has shown to be suitable to provide the storage container with a lateral discharge opening, that is with a discharge opening provided on one of the side walls of the storage container. In this way, the space between the storage container and milled-off or peeled-off road surface level is not unnecessarily reduced by the conveyor device assigned to the storage container.

For controlling the blending ratio of milled-off or peeled-off material and new material fed from the storage container, the opening cross section of the discharge opening of the storage container is advantageously continuously adjustable by means of a slide plate. Additionally thereto, or instead of it, the discharge opening of the storage container may also be connected via the first conveyor device to the feeder opening of a dosing device provided on the chassis. In the case of such a solution, the adjustment of the blending ratio is made by the dosing device while the slide plate continuously adjusting the discharge opening controls the feeding of the new material from the storage container to the dosing device.

Such a solution is of use if the conveyor device provided between the discharge opening and the dosing device is driven with a constant velocity, that is, the feeding of the new coating material for the dosing device is not adjustable by changing the velocity of the conveyor device. If there is a dosing device, it may be of advantage to provide a third conveyor device extending from the dosing device to the blending device, which is generally provided in the rear portion of the chassis and at the end of which, at the side of the dosing device, the second conveyor device terminates.

In accordance with a particularly advantageous embodiment of the invention, the storage container is provided with a dosable discharge opening facing the second conveyor device and the first conveyor device is substituted by the second conveyor device. In this embodiment, the transport of the material milled-off or peeled-off by the collector device as well as the transport of the material taken from the storage container to the blending device is done by one single conveyor device while the blending ratio of new coating material and of milled-off or peeled-off material is adjusted by the dosingly adjustable discharge opening.

A further improvement of the adhesion of the new coating material to the milled-off or peeledoff underground may, in accordance with a further idea of the invention, be obtained in that in front, as seen in the direction of motion, of said means for applying the coating material as taken from the blending device, a device tearing the peeledoff or milled-off road surface is provided. A predetermined roughening and loosening to a little depth of the milled-off or peeled-off road surface is made thus increasing the total contact area between the old and the new coating and hence the adhesion of the new coating on the old one.

In accordance with an advantageous embodiment of the invention, the tearing device includes a free-wheeling spiked roller. This spiked roller includes a cylindric core on which a number of thin and relatively short bars are provided. In order to be able to adjust the tearing depth, the tearing device is height adjustable. Considering that after the tearing process smaller coating particles may irregularly be assembled on the milled-off or peeled-off road surface, it is advisable to provide a tearing device, which includes a worm distributor provided behind the spiked roller as seen in the direction of motion, through which the loosened coating particles are uniformly distributed over the milled-off or peeled-off road surface.

The invention will now be explained in more detail based on the drawing which includes, partly in a schematic representation, exemplified embodiments.

Figure 1 shows a lateral view of an apparatus for coating milled-off or peeled-off road surfaces.

Figure 2 shows a front view of a coating apparatus including a collector device collecting the milled-off or peeled-off material in the middle.

Figure 3 shows a front view of a coating apparatus including a collector device collecting the milled-off or peeled-off material on its side.

Figure 4 shows a top view of the collector device according to Figure 3.

Figure 5 shows a front view of a coating machine including a collector device collecting the milled-off or peeled-off material in the middle and having a single conveyor device.

Figure 6 shows a partial view of the worm conveyor provided with milling chisels.

Figure 7 shows in a partial side view of the apparatus the worm conveyor and the arrangement of the shield or mantle supporting on the road surface.

The apparatus for coating milled-off or peeledoff road surfaces with a new coating comprises a chassis 1 including a steerable front wheel pair 2 and a rear wheel pair 3, which is driven by means of a diesel engine 4 provided on chassis 1. Behind diesel engine 4, the driver's stand 5 of the apparatus is provided.

In the front of chassis 1 , swivel arm pair 6 is rotatably hinged while two hydraulic operating cylinders 7 are provided for swivelling swivel arm pair 6. At the end averted from chassis 1, swivel arm pair 6 carries a storage container 8 for coating material 9 newly to be applied. Coating material 9 passes through a lateral discharge opening not shown onto a conveyor device 10, of which in the lower portion only the bearings 11 for the support rollers are shown. Conveyor device 10, designed as a belt conveyor, terminates above the drop opening of a dosing device 12, the continuously adjustable discharge opening of which is provided above a second conveyor device 1 3 extending from storage container 8 to shortly before the rear wheel pair 3, where a blending device 14 is provided.Conveyor device 13 is also designed as a belt conveyor the conveyor belt running above a plurality of support rollers supported in bearings 1 5 in chassis 1 and in the swivel arm pair 6. The end of conveyor device 1 3 averted from blending device 14 is assigned to a collector device 1 6 rigidly secured to container 8.

Collector device 16 includes a worm conveyor 17 transporting the milled-off or peeled-off material to the middle of the worm conveyor from where it is taken up by conveyor device 13. The milled-off or peeled-off material is subsequently transported by conveyor device 13 to the rear where it is added, at the location of the dosing device 12 and from it, new coating material 9 in the desired blending ratio. The milled-off or peeled-off material together with the new coating material 9 stemming from the dosing device 12 arrives then at the blending device 14 wherein the two materials are intimately blended. The material intimately blended is then discharged from the blending device 14 to the milled-off or peeled-off road surface and uniformly distributed, by means of a worm distributor 18, over the underground of the milled-off or peeled-off road surface.By means of a stamper 19, the coating material is pressed into the underground and subsequently subjected to a preconsolidation by means of a screed 20. Final consolidation of the material is brought about by means of a road roller moving behind the coating machine. The material discharge from the blender may also be implanted by means of a common finisher secured to the apparatus.

In order to obtain a constant compound of the new road surface with the milled-off or peeled-off underground withstanding also heavy loads of the rolling traffic, heating devices 21,22 and 23 are provided along the length of the apparatus and operated with liquid gas from two liquid gas containers 24 and 25. The evaporator required for the operation of heating devices 21, 22 and 23 is also provided on chassis 1 but is not shown here.

Heating device 21 as well as heating device 22 are rigidly secured to swivel arm pair 6 while heating device 23 is height-adjustably provided, by means of four hydraulic operating cylinders 26, to chassis 1.

Between heating device 23 and blending device 14, furtheron, a tearing device 27 is provided comprising a spiked roller not shown rotating in a housing 28 and a worm distributor arranged behind it. Tearing device 27 may be lifted and lowered by means of a heightadjustable support wheel 30.

It should be noted that conveyor device 13 may also be subdivided into two conveyor devices, viz. one which transports the milled-off or peeled-off material from collector device 16 until in front of the dosing device 12 and into a second one, which takes up from this location the milledoff or peeled-off material discharge from the first conveyor device and transports the material discharged from the dosing device and this one to blending device 14.

As can be taken from Figure 2, the structured comprising storage container and collector device secured to swivel arm pair 6 may consist of a storage container 8' having a bottom 31 oblique relative to a side wall and a collector device 16 collecting the milled-off or peeled-off material in the middle provided below and in front of storage container 9'. In the embodiment shown in Figure 2, the new coating material in container 8' is trar sported by means of a worm conveyor 32 arranged at the side of the storage container to dosing device 12.

Collector device 1 6 includes worm conveyor 33 having to oppositely directed worm walks 34 and 35 each extending over half of the worm conveyor 33. Worm conveyor 33 is supported in two side walls 36 and 37 welded to container 8'.

On the outer side of side 36, drive motor 38 for worm conveyor 33 is provided.

In the two side walls 36 and 37, furtheron, guide pulley 39 for conveyor belt 40 of conveyor device 13 is supported. Conveyor belt 40 passes under storage container 8' to the rear and then, between the two swivel arms of swivel arm pair 6 upwardly to the chassis level.

At the front edges, the two side walls 36 and 37 each pass over into a guide steel sheet 41 or 42, respectively.

In the case of this collector device, the milledoff or peeled-off material is guided by the two worm walks 34 and 35 towards the middle of the conveyor worm wherefrom it is transported off by means of the conveyor device 1 3 provided in the middle.

In the embodiment according to Figures 3 and 4, a storage container 8" is provided, which includes, at its bottom side, a discharge opening through which the new coating material 9 may; fall onto a conveyor device 10, which is designed as a belt conveyor and which transports the material to dosing device 12.

Below storage container 8" there is again a collector device 16' including a worm conveyor 43 having a worm walk 44 rotating in one direction along the total length. Worm conveyor 43 again is rotatably supported between two side walls 36' and 37'. In the direction of motion, which is indicated by arrow A, behind worm conveyor 44, there is a guide steel sheet 45, which supports the transport of the milled-off or peeled-off material by worm conveyor 44 in the direction to conveyor device 46.

Behind guide steel sheet 45 and thus behind worm conveyor 44, a roller steel brush 47 is provided rotatably supported between the two side walls 36' and 37'. Roller steel brush 47 and worm conveyor 44 are in operative connection via a gear 48 to a drive motor 49. Roller steel brush 47 is provided for collecting the milled-off or peeled-off material of smaller fractional size, which would not be caught by worm conveyor 44.

Behind roller steel brush 47, finally, a further guide steel sheet 50 is provided guiding the material caught by the roller steel brush into the direction of conveyor device 46. Conveyor device 46 is provided behind an opening 51 in side wall 36' and is designed as a worm conveyor. It transports the milled-off or peeled-off material onto a conveyor device provided on chassis 1 of the apparatus from which it is transported, together with the material stemming from storage container 8", to blending device 14.

In the embodiment shown in Figure 5, a single conveyor device 52 is provided, designed asa belt conveyor, for transporting the new coating material from container 8"' and of the collected milled-off and peeled-off material from collector device 16" to blending device 14.

Storage container 8"' again includes, at the bottom, a discharge opening 55 the cross section of which is continuously adaptable so that a dosed addition of the coating material to conveyor device 52 is possible through it.

Collector device 1 6" again includes a roller conveyor 1 6 including two oppositely directed worm walks 34 and 35 transporting the milled-off and peeled-off material to the middle wherefrom it is taken up and transported off by conveyor device 52.

Conveyor device 52 comprises a circulating conveyor belt 53 passing around a first guide pulley 54 rotatably supported between the two side walls 36" and 37" of the collector device.

The further guide pulley of conveyor device 52 is provided on chassis 1 of the apparatus.

The worm conveyor of collector device 1 6 shown in Figure 6 includes, on the outer periphery of worm walks 54, milling chisels 55, which are cyiindric chisels inserted into corresponding bores in the worm walks and retained therein by means of a snap ring.

The worm conveyor shown in Figure 7 as a lateral view of collector device 1 6 cooperates with shield or mantle 56 thus obtaining a better crushing of the milled-off material 57 and a better conveying effect.

Claims

1. An apparatus for coating milled-off or peeled-off road surfaces with a layer, said apparatus comprising a chassis including an own drive engine, on which chassis a storage container for the new material to be applied is arranged in the front area and a blending device is arranged behind it as seen in the direction of motion, which is directly or indirectly fed the new material via a first conveyor device assigned to said storage container and the milled-off or peeled-off material via a second conveyor device assigned to a device collecting the milled-off or peeled-off road surface material from the ground, and at least one heating device for heating the milled-off or peeled-off road surface and means for applying the coating material taken from the blending device and consisting of new material and-milled-off or peeled-off material, wherein said device collecting the milled-off or peeled-off road surface material from the ground is provided in front of said storage container as seen in the direction of motion and said second conveyor device assigned to said collector device is guided to the rear close by said storage container and spaced relative to the milled-off or peeled-off road surface level.

2. An apparatus according to claim 1, wherein said conveyor device assigned to said collector device is guided to the rear at the side of said storage container.

3. An apparatus according to claim 2, wherein a collector device collecting the milled-off or peeled-off material and transporting it to the side is provided and said conveyor device is provided as a worm conveyor operating in a tube.

4. An apparatus according to claim 3, wherein said collector device transporting the peeled-off or milled-off material to the side includes at least one worm conveyor having a spiral walk running in one direction over the total length.

5. An apparatus according to claim 4, wherein behind said worm conveyor as seen in the direction of motion a rotating roller steel brush is provided oblique relative to said worm conveyor such that the milled-off or peeled-off material of smaller fractional size is conveyed from said brush to the end of said collector device at the side of the conveyor device.

6. An apparatus according to claim 1, wherein said conveyor device assigned to said collector device is guided to the rear under the bottom of said storage container.

7. An apparatus according to claim 6, wherein a collector device collecting the milled-off or peeled-off material and transporting it to the middle is provided and said conveyor device is provided as a belt conveyor.

8. An apparatus according to claim 7, wherein said collector device transporting the peeled-off or milled-off material to the middle comprises at least one worm conveyor including two opposite spiral walks each extending about half of the length of said worm conveyor.

9. An apparatus according to claim 8, wherein behind said worm conveyor as seen in the direction of motion two roller steel brushes are provided rotating under an angle relative to each other such that the milled-off or peeled-off material of smaller fractional size is transported by said brushes to the middle of said collector device.

1 0. An apparatus according to one of claims 1 through 9, wherein said collector device is secured to said storage device.

11. An apparatus according to one of claims 1 through 10, wherein said collector device is height adjustable.

12. An apparatus according to one of claims 1 through 11 , wherein the outer periphery of said spiral walks of said worm conveyor is provided with milling chisels.

13. An apparatus according to claim 12, wherein said worm conveyor extends over the total width of the milled-off road surface.

14. An apparatus according to claim 12 or 13, wherein behind said worm conveyor as seen in the direction of motion a shield or mantle supporting on the milled-off road surface is provided.

15. An apparatus according to claim 10 or 11, wherein said collector device is rigidly secured to said storage container and said storage container is height-adjustably provided on the chassis.

1 6. An apparatus according to one of claims 1 through 15, wherein said storage container includes a laterial discharge opening.

17. An apparatus according to claim 16, wherein the opening cross section of said discharge opening may continuously be adjusted by means of a slide plate.

18. An apparatus according to claim 16 or 17, wherein said discharge opening of said storage container is connected via said first conveyor device to the feeder opening of a dosing device provided on said chassis.

1 9. An apparatus according to claim 18, wherein a third conveyor device is provided extending from said dosing device to said blending device and at the end of which, at the side of the dosing device, the second conveyor device terminates.

20. An apparatus according to one of claims 1 through 19, wherein said storage device includes a dosable discharge opening facing said conveyor device and said first conveyor device is substituted by said second conveyor device.

21. An apparatus according to one of claims 1 through 20, wherein in front, as seen in the direction of motion, of said means for applying the coating material taken from said blending device a device tearing the peeled-off or milled-off road surface is provided.

22. An apparatus according to claim 21, wherein said tearing device includes a free wheeling spiked roller.

23. An apparatus according to claim 21 or 22, wherein said tearing device is height adjustable.

24. An apparatus according to one of claims 21 through 23, wherein said tearing device includes a worm distributor provided behind said spiked roller as seen in the direction of motion.

25. An apparatus substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.