EP3225738B1 - Fraiseuse de sol, en particulier engin de fraisage de chaussée destiné à enlever de la matière du sol et son procédé de fonctionnement - Google Patents

Fraiseuse de sol, en particulier engin de fraisage de chaussée destiné à enlever de la matière du sol et son procédé de fonctionnement Download PDF

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Publication number
EP3225738B1
EP3225738B1 EP17000478.2A EP17000478A EP3225738B1 EP 3225738 B1 EP3225738 B1 EP 3225738B1 EP 17000478 A EP17000478 A EP 17000478A EP 3225738 B1 EP3225738 B1 EP 3225738B1
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EP
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Prior art keywords
electrostatic precipitator
dust
milling machine
conveyor belt
machine
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EP17000478.2A
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German (de)
English (en)
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EP3225738A1 (fr
Inventor
Robert Laux
Rafael Schomaker
Joachim Ponstein
Matthias SCHAAF
Bernd Lubischer
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Bomag GmbH and Co OHG
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Bomag GmbH and Co OHG
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
    • E01C23/088—Rotary tools, e.g. milling drums
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
    • E01C23/127—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus rotary, e.g. rotary hammers
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/50—Methods or devices for preventing dust by spraying or sucking
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/22—Equipment for preventing the formation of, or for removal of, dust
    • E21C35/223—Equipment associated with mining machines for sucking dust-laden air from the cutting area, with or without cleaning of the air

Definitions

  • the invention relates to a ground milling machine, in particular a road milling machine, for removing soil material and to a method for operating a ground milling machine.
  • the invention is generally concerned with the control of dust in the working operation of a ground milling machine, especially in the environment of the machine operator. This is for example in the DE102012022879B4 described in more detail, which is incorporated herein by reference.
  • the resulting during operation of such Bodenfräsmaschinen dust pollution is disadvantageous for the machine operator and for persons in the immediate vicinity of the construction machine for safety and health reasons.
  • a particularly intense dust development occurs especially in ground milling machines of the type road milling machine, in particular road cold milling machine, and so-called surface miners.
  • Such ground milling machines comprise a machine frame with a running gear, a milling drum mounted on a machine frame, a transporting device with at least one conveyor belt, which is arranged on the machine frame and for the removal of removed soil material, the milled material, in a conveying direction away from the Milling roller is formed towards a discharge point.
  • Soil milling machines of the generic type thus have at least one milling drum as a working device, which mills with its axis of rotation horizontally and transversely to the working direction rotating soil material.
  • the milled material is then removed from the Fräswalzenkasten inside which the milling drum is arranged, transported by a transport device, usually comprising at least one conveyor belt away from the milling drum in the conveying direction to a transfer point, in which the milled material, for example, in a means of transport, especially a truck, or is dropped on the ground next to the construction machine.
  • the conveying direction in the present case thus denotes the transport direction of the milled material away from the milling drum.
  • the central point of the dust development is in particular the area of the milling drum or of the milling drum box with the rotating milling drum arranged therein as well as the transport device.
  • Typical ground milling machines are road milling machines, stabilizers, recyclers or surface miners.
  • suction devices are already known for ground milling machines, which generate a negative pressure in the milling drum box and extract from there the dusts and vapors produced during the milling work.
  • a suction device connected to a channel via a suction opening for extracting dust is provided, wherein the suction opening is arranged between the channel inlet and the channel outlet.
  • the channel designates the conveying path of the material to be milled from the point of delivery thereof to the transport device up to the delivery point, wherein the channel in this region is usually formed at least partly enveloping the transport device.
  • the suction opening is mounted in the vicinity of the channel entrance.
  • Such a construction machine is for example in the DE 102 23 819 A1 described, which is hereby incorporated into the construction and operation of a generic construction machine in reference.
  • the attachment of rubber mats is described at the channel exit, which at least partially seal the channel exit in the conveying direction to the outside.
  • these rubber mats are extremely susceptible to wear, in particular due to the sharp-edged nature of the milled material.
  • An alternative, virtually wear-free option is in the DE102012022879B4 described, after which a blocking flow is generated with a Fluidausström founded to allow a defined flow guidance of the dust-laden air.
  • An essential basic idea of the invention is to provide an electrostatic precipitator on the ground milling machine, via which dust emerging from the dust-laden air can be separated via the dust arising during the milling operation and / or during the transport of milled material.
  • an electrostatic precipitator or electrostatic precipitator in the present case is generally understood a device, which allows separation of airborne particles, especially particulate matter, by the electrostatic principle.
  • dust particles with an aerodynamic diameter of not more than 50 ⁇ m and in particular of not more than 30 ⁇ m are understood to mean, for example, the charging of the dust particles and subsequent deposition in a manner basically known per se in the prior art.
  • the advantage of using an electrostatic precipitator in the present case is that, in particular with respect to the fine dust content significantly improved filter results can be achieved and in this way the dust load of the operator of the ground milling machine and bystanders can be reduced.
  • the electrostatic precipitator can be integrated particularly favorably into a ground milling machine and can also be operated reliably there. At the same time the deposition results are very good, so that with the arrangement according to the invention a particularly efficient reduction of dust is possible.
  • An electrostatic precipitator itself is for example in the WO2013 / 070078 A1 describe, which is incorporated herein by reference.
  • the electrostatic precipitator is arranged there or at least in the vicinity where the dust pollution occurs or is relatively high compared to the environment.
  • This arrangement has the advantage that the electrostatic precipitator is integrated directly into the machine body, thereby enabling a particularly compact design of the entire machine.
  • the electrostatic precipitator is arranged on the transport device, in particular on a trailer conveyor belt.
  • the transport device follows in relation to the material flow of the material to be milled to the milling drum or the Fräswalzenkasten, so that the dust load in this area is usually also relatively high.
  • the transport device and in particular the trailer conveyor belt is particularly suitable for space-technical reasons for the arrangement of the electrostatic precipitator, especially since the electrostatic precipitator at this point (trailer conveyor) from the outside, for example, for maintenance and / or cleaning purposes, is easily accessible.
  • This area is also particularly suitable for mounting a retrofitted electrostatic precipitator.
  • the transport device may comprise a transfer conveyor belt and, in the conveying direction behind, a loading conveyor belt.
  • the transfer conveyor belt is often arranged inside the ground milling machine or inside the machine body, whereas it is regularly in the loading conveyor belt is a so-called trailer conveyor belt, which is attached to the machine frame of the ground milling machine.
  • the transfer conveyor Primarily the conveying of the milled material from the milling drum or from the milling drum box takes place to the downstream in the conveying direction Verlade antiband.
  • the loading conveyor With the loading conveyor, however, the actual loading of the material to be milled takes place, for example, on a corresponding transport vehicle.
  • the ground milling machine is as small as possible in total with respect to its longitudinal extent.
  • the loading conveyor foldable with a machine part and a folding part, wherein the folding part to the machine part, in particular preferably coming from below, is foldable.
  • the loading conveyor belt is connected with the rest of the ground milling machine via the machine part, and the folding part forms the drop-off area of the loading conveyor belt that can be folded for transport purposes.
  • the electrostatic precipitator on the loading conveyor belt and especially if a foldable loading conveyor belt is used is arranged on the machine part of the loading conveyor belt. This place is on the one hand for reasons of space especially for the arrangement of this additional module.
  • the arrangement at this point is particularly suitable for guiding the dust-laden air and a sufficient reduction of dust pollution, especially in the range of a control station of the ground milling machine and in the discharge area of the loading conveyor allows.
  • the loading conveyor is designed such that the folding part is foldable from below to the machine part and the electrostatic precipitator is mounted on top of the machine part accordingly.
  • the electrostatic precipitator is disposed within the machine body.
  • the electrostatic precipitator is thus not attached to the outside of the machine, but positioned in the interior thereof. In this way, the external dimensions of the machine are not additionally increased by the inventively provided electrostatic precipitator.
  • the Bodenfräsmaschine has at least one transfer conveyor on which out of the Fräswalzenkasten milled material is transferred directly and over which the milled material is transported out of the machine inside, wherein for receiving the transfer conveyor belt a storage shaft is present, and wherein the Elektroabscheider at least is partially disposed within this storage shaft.
  • the storage shaft thus denotes an existing inside the machine elongated tunnel-like recess into which, for example, the transfer conveyor belt can be inserted coming from outside.
  • This storage shaft is particularly well suited for accommodating the electrostatic precipitator, since the already existing for conventional machines Space is already large enough for additional inclusion of Elektroabscheiders or at least only slightly increased must.
  • a pump device in particular a suction device, is provided, with which the dust-laden air can be conveyed.
  • pumping devices for example corresponding blowers, are known in principle in the prior art, such as in the DE 10223819 A1 and DE 102012022879B4 disclosed.
  • the pumping device in particular in the form of a suction device, is designed such that it supplies dust-laden air to the electrostatic precipitator. This makes it possible, in particular, to achieve targeted dust extraction from dust-laden areas and guidance of the dust-laden air toward the electrostatic precipitator, in order to allow particularly efficient separation of dust particles from the air.
  • the flow guidance of the dust-laden air can be made use of various alternatives. It is advantageous, for example, if the pump device has a suction device, via which dust-laden air is sucked off the milled material and its immediate surroundings, wherein the suction device is designed in particular such that the suction direction on the input side to the suction device runs at least partially counter to the conveying direction of the milled material.
  • the dust-laden air is thus deflected once compared to the conveying direction of the milled material, in particular by more than 90 °.
  • a flow shaft is present through which the dust-laden air is guided by means of the pumping device.
  • a flow shaft thus designates a channel-like, in particular static, flow-guiding section, in particular with one or more shaft walls, comprising an air inlet, a dedusting section and an air outlet.
  • the electrostatic precipitator is now arranged with at least one charging stage and at least one separation stage within this flow shaft.
  • the charge level of the electrostatic precipitator refers to the area responsible for the electrostatic charge of the dust particles.
  • the separation stage designates that part of the electrostatic precipitator from which the electrostatically charged dust particles be attracted and deposited on this.
  • the flow shaft itself can be varied manifold in an advantageous manner.
  • the flow shaft for example, as housing around at least part of the transport device.
  • the conveying channel of the transport device and the flow shaft of the electrostatic precipitator then form a common space, wherein a mechanical barrier between the subspace of the electrostatic precipitator and the subspace of the conveying channel is additionally preferably provided, for example a grid, in order to prevent damage to parts of the electrostatic precipitator by components of the milled material ,
  • the flow shaft is at least partially formed spatially separated from a conveying channel surrounding the conveyor belt.
  • the flow shaft of the electrostatic precipitator is preferably designed such that it opens on the output side into the conveyor channel, in particular above the conveyor belt.
  • the dust-laden air is thus sucked first, for example, in the field of Fräswalzenkastens and / or the transfer conveyor belt, branched off and fed to the electrostatic precipitator.
  • the now cleaned air is returned to the conveyor channel, in particular above the conveyor belt.
  • at least one connecting line is present beyond the flow shaft, which adjoins, for example, in the flow direction.
  • the flow shaft of the electrostatic precipitator is arranged on the conveying channel of the transporting device or is placed thereon.
  • the flow shaft of the electrostatic precipitator then forms a compact unit with the conveying channel of the transport device. This may in particular be the loading conveyor belt or even the inner area of a storage shaft, as described above, in particular for a transfer conveyor belt.
  • the electrostatic precipitator is designed such that the air to be cleaned is guided in a substantially straight line through it.
  • the air duct in the electrostatic precipitator takes place such that the air is once again diverted several times within the electrostatic precipitator, for example by suitable guide surfaces, etc., whereby in particular not directly impinged conducting surfaces can in particular also be used as separating elements of the electrostatic precipitator ,
  • the electrostatic precipitator is preferably designed such that the charging stage is an anode, in particular in the form of a corona electrode , and the deposition stage is a cathode.
  • the electrostatic charge of the dust particles is thus preferably such that they are positively charged.
  • This type of charging has proven to be particularly efficient for the present application.
  • the separation stage is accordingly preferably negatively charged. In this way, a particularly efficient agglomeration of dust particles and subsequent deposition takes place on the separation stage.
  • the charging stage is the cathode and the deposition stage is the anode. This too can lead to satisfactory deposition results.
  • the separation stage it is possible to adapt the separation stage at will to the respective room conditions.
  • the separation stage may be, for example, a plate and / or a grid.
  • the separation stage is a, in particular designed as a flow well, housing, at least the inner housing, of the electrostatic precipitator. The separation stage thus fulfills a dual function in this embodiment.
  • the separation stage may in particular also comprise a plurality of individual separation surfaces and / or be formed in a three-dimensionally deformed manner, in particular curved.
  • the charging stage can be used on a variety of variants.
  • the charging stage is a wire, a wire mesh or even a plate-like structure. It is essential that certain minimum distances are kept to Abscheideix to prevent as possible a rollover between charging and separation stage. It is further preferred if the charging step extends in the longitudinal direction of the separation stage, in particular along the flow shaft and / or in the direction of the flow direction of the air. In this way it is possible to maximize the charge path to be passed by the dust-laden air and thereby achieve optimum deposition rates. This therefore means that the charging stage preferably extends in the flow direction of the dust-laden air.
  • the charging step may additionally or alternatively be designed such that it comprises at least one subregion which runs essentially transversely to the flow direction of the dust-laden air.
  • the charging step then constitutes a type of flow obstruction and / or turbulence stage, which also ensures a high ionization rate of the dust particles in the dust-laden air. Additional turbulence devices, such as, for example, swirl sheaths, can also be provided to improve the charging process.
  • the electrostatic precipitator comprises a cleaning device with which material adhering to the electrostatic precipitator can be removed therefrom.
  • the advantage of the cleaning device is that the cleaning of the electrostatic precipitator can be performed, for example, automatically and / or without time-consuming manual work.
  • the cleaning device can, for example, have a switch-off device, via which voltages applied to the separating stage and the charging stage are switched off during the operation of the conveying device.
  • the electrostatic precipitator is then blown free by means of the pumping device.
  • This effect can be further enhanced if, for example, a pressure pulse can be generated by means of the pumping device.
  • the electrostatic precipitator can also be a separate cleaning device with, for example, cleaning nozzles, in particular for Air and / or water, the actuation of which triggers the charging stage and / or separation stage with compressed air and / or water.
  • Water has the advantage here that it binds the separated dust particles.
  • Another possibility consists in a mechanically acting cleaning device, with the deposited on the separation stage dust particles are removed. This may be, for example, a vibrating and / or knocking device, in particular by means of a motor-operated plunger and / or eccentric, so that the separated dust material is cut off from the separating step.
  • a Abschab- and / or Bürst is possible.
  • the cleaning device has an ejection opening or flap, through which material removed from the separation stage can be removed from the electrostatic precipitator, in particular onto the conveyor belt or into a separate collecting container.
  • the ejection opening and flap thus a connection between the electrostatic precipitator and the conveyor belt / the collecting container is obtained, via which the separated dust material can be returned to the conveyor belt or can be disposed of separately via the collecting container.
  • the ejection opening or flap is preferably designed such that material separated from the separation stage falls through the latter onto the conveyor belt / into the collecting container.
  • a collecting container this can be provided, for example, to be able to carry a suitable container compartment in order to be able to carry the container or to use an ideally sealed connecting device via which an external collecting container is dust-tight for cleaning purposes at the ejection opening or flap can be connected.
  • Part of the electrostatic precipitator is preferably also a housing with at least one maintenance flap, through which the access to the interior of the electrostatic precipitator, in particular the charging stage and / or the separation stage, is possible.
  • the maintenance flap is thus closed during regular operation of the electrostatic precipitator.
  • the maintenance flap thus allows access from the outside to the interior of the electrostatic precipitator, for example for cleaning and / or maintenance purposes.
  • the electrostatic precipitator can be completely and permanently installed in the floor milling machine as a functional unit.
  • the electrostatic precipitator form as a module, comprising at least one connection means for connecting a, in particular the machine side, electrical power supply.
  • This variant has the advantage that the electrostatic precipitator can be removed and / or replaced comparatively quickly, which may be desirable, for example, if defects occur at the electrostatic precipitator.
  • a module is thus referred to as a component unit which can be installed as a contiguous component in the rest of the machine and can be removed again.
  • the electrostatic precipitator for this purpose comprises a releasable holding device for attachment to the ground milling machine, in particular comprising at least one of the features rail guide and / or positive locking and / or clamping fixation.
  • the expansion of the electrostatic precipitator succeeds particularly well, since the attachment of the electrostatic precipitator can be solved quickly.
  • the electrostatic precipitator reliably assumes its defined end position during installation due to the holding device, which in turn accelerates and simplifies the installation of the electrostatic precipitator.
  • a closing state sensor is present, via which the closed state of the maintenance flap can be monitored.
  • a closure state sensor may be, for example, a contact switch, in particular a reed contact switch, or the like, which is actuated when the maintenance cover is closed.
  • the closing state sensor is preferably connected to a control unit.
  • the control unit is designed such that it prevents the separating stage and / or charging stage from being supplied with electrical energy when the maintenance cover is open. As a result, the safety for the operating personnel can be increased.
  • the electrostatic precipitator In principle, it is possible to use electrical energy for the supply of the electrostatic precipitator to its own energy source, such as a battery. However, it is preferred if the electrostatic precipitator is connected to the electrical system of the ground milling machine for the supply of electrical energy. This is ideally done with the interposition of a converter.
  • At least two electrostatic precipitators are connected in parallel or at least two flow shafts are provided. In this way, the deposition results can be further improved. Additionally or alternatively, two electrostatic precipitators can also be connected in series.
  • additional purification stages are provided in addition to the electrostatic precipitator.
  • a centrifugal separator cyclone filter
  • cyclone filter in particular in the flow direction of the dust-laden air in front of the electrostatic precipitator.
  • coarser particle before the electrostatic precipitator are removable from the dust-laden air.
  • a grid and / or at least one labyrinth filter stage may be provided.
  • an upstream filter stage it is ideally designed to cause only a small pressure drop across that filter stage.
  • a Nachfilterme is present for the deposition of particulate matter in particular, which is downstream of the electrostatic precipitator in the flow direction, wherein the Nachfilterme is in particular a further electrostatic precipitator.
  • the Nachfilterme is in particular a further electrostatic precipitator.
  • This increased effort is particularly useful when working with problematic materials, such as asbestos, and / or indoors.
  • it is also possible to provide a Wasserberieselungs in addition to the electrostatic precipitator. This is arranged in particular in relation to the flow direction of the air moved through the pumping device in the area behind the electrostatic precipitator, especially in the region of the loading conveyor belt.
  • the sprinkler can be, for example, one or more nozzles and / or a spray bar.
  • the water sprinkler With the help of the water sprinkler, an efficient capture of dust particles that are still present in the air after passage of the electrostatic filter succeeds. It is optimal if measures are taken to charge the water discharged from the water sprinkling device in an analogous manner to the separation stage, which can be achieved, for example, by means of a corresponding ground connection. In this way, the cleaning effect achieved with the sprinkler can be further improved.
  • the sprinkler is optimally arranged such that the water discharged from it is collected by the conveyor belt, in particular the Verladefördeband. In operation, the discharged water is then ejected together with the milled material.
  • Another aspect of the invention lies in a method for operating a ground milling machine, in particular for reducing the dust load during operation of a ground milling machine.
  • the method relates to the operation of a ground milling machine according to the invention.
  • Essential steps of the method according to the invention are A) performing a milling operation, B) passing dust-laden air towards an electrostatic precipitator, C) charging and separating dust particles in the electrostatic precipitator and D) blowing out the cleaned air. It is thus essential for the method according to the invention for operating a ground milling machine that an electrostatic precipitator be used to reduce the dust load, the dust-laden air is supplied for cleaning.
  • step B) in particular, the dust-laden air is extracted from the area of the milling drum box, in particular via a suitable suction fan. The dust-laden air is then preferably led out of the interior of the ground milling machine and forwarded to the electrostatic precipitator.
  • step C) the positive charge of the dust particles is provided in particular.
  • step D) the purging is particularly preferably carried out by returning the air into the conveying channel of the transport device and not at a separate location on the ground milling machine, which is also possible and included in the invention.
  • the inventive method can also be further improved if in step B) a suction of the dust-laden air from the Fräswalzenkasten and / or a conveying channel for milled material takes place and / or if in step C) the charging and depositing in a separate from the conveyor channel flow shaft he follows.
  • Essential in these preferred developments is first the targeted extraction of dust-laden air from the Fräswalzenkasten and / or a conveyor channel for milled material.
  • the extracted dust-laden air is then fed to the electrostatic precipitator in a spatially separate area for deposition. In this way, therefore, a separate Entustaubungsumble is obtained, which is spatially separated from the transport path of the material to be milled (conveyor channel).
  • this enables a particularly efficient separation of the dust contained in the dust-laden air.
  • the work train 1 in FIG. 1 In milling operation, the ground milling machine 2 drives its own drive behind the transport vehicle 3 in the direction of A. Essential elements of the transport vehicle 3 are a control station 4 and a loading area 5 for receiving milled material ,
  • the ground milling machine 2 comprises, in addition to a control station 6, a machine frame 46 (FIG. Fig. 2 ), Chassis (crawler tracks or wheels), a drive motor, a milling device 7 and a transport device 8, with which the milled material obtained from the milling device 7 to the discharge point 9 of the transport device 8 is transportable.
  • the transport device 8 comprises a transfer conveyor belt 10 arranged inside the ground milling machine 2 and a loading conveyor belt 11.
  • the ground milling machine 2 has an electrostatic precipitator 12 which is arranged on the loading conveyor belt 11 of the transport device 8.
  • the electrostatic precipitator 12 is connected to a pumping device 13, specifically a blower.
  • FIG. 2 clarifies further details of the structure of the ground milling 2 from FIG. 1 , Specifically, the milling device 7 comprises a milling roller box 14 and a milling roller 15. Within the milling roller box 14, the milling roller 15 can be moved in a known manner about a horizontal axis of rotation perpendicular to the working direction A.
  • the milled from the milling drum 15 soil material is loaded from the Fräswalzenkasten 14 out on the transfer conveyor belt 10 and transported within a conveyor channel 16 within the ground milling machine 2 to the loading conveyor belt 11.
  • the loading conveyor belt 11 is also surrounded by a housing 17, so that the loading conveyor belt 11 extends within a conveying channel 18.
  • the loading conveyor belt 11 or the conveying channel 18 opens into the discharge point 9, from which the milled material, for example on a transport vehicle, is dropped.
  • the device for dust further comprises a suction channel 19, a connecting line 20, a charging stage 21, a separation stage 22, a cleaning device 23, a supply source 24 for electrical energy and an outlet 25 of the electrostatic precipitator 12.
  • a suction channel 19 Via the intake channel, dust-laden air is sucked in from the area of the milling drum box 14 and, in particular, also from the region of the conveyor channel 16.
  • the suction fan 13 generates a negative pressure in this area, so that the dust-laden air is drawn in.
  • the suction device 13 is connected via the connecting line 20 with the electrostatic filter 12.
  • the charged particles are first charged by the charging stage 21 and then the charged dust particles are deposited at the separating stage 22.
  • the charging stage 21 and the separating stage 22 are connected via suitable connecting lines with the electrical energy source 24, which in the present embodiment is a high voltage source (HVPS) connected via a converter to the vehicle electrical system of the ground milling machine 2.
  • HVPS high voltage source
  • the now cleaned air is blown from the electrostatic precipitator 12 via the outlet 25 into the delivery channel 18 and thus also leaves the transport device 8 via the discharge point 9.
  • the electrostatic filter 12 is arranged on the loading conveyor belt 11. Specifically, it is at the loading conveyor belt 11 to a foldable conveyor belt with a machine part 26 and a folding part 27, which are pivotally connected to each other via a pivot joint 28. In other words, the electrostatic precipitator sits on the "non-foldable" portion of the loading conveyor belt 11.
  • FIG. 2 are the flow of air with the dashed arrows B and the conveying direction of the milled material indicated by the arrows C.
  • FIG. 2 makes it clear that the dust-laden air is first separated from the milled material through the intake channel 19 and the dedusting thus takes place at a spatially separate location for conveying the milled material.
  • the electrostatic precipitator 12 can be protected from damage by the milled material, for example.
  • the cleaning device 23 can be actuated, for example, from outside the electrostatic precipitator 12, automatically triggered after certain operating intervals and / or automatically triggered in certain operating situations, for example when the loading conveyor 11 is put into operation.
  • FIG. 2 not shown may be provided, via which the operation of the cleaning device 23, in particular automatically, is controllable.
  • a connection opening between the bottom of the electrostatic precipitator 12 and the delivery channel 18 can also be present, through which cleaned-up dust from the electrostatic precipitator 12 can fall onto the conveyor belt of the loading conveyor belt 11.
  • FIG. 2 further clarifies that in the present embodiment, in addition to the electrostatic precipitator 12, a further device for dedusting is available.
  • a sprinkler 29 (can optionally also in the other embodiments, in particular according to the FIGS. 5 to 7 , be provided in addition), which extends over the width of the conveyor belt or the loading conveyor belt 11 just before the discharge point 9.
  • the sprinkler 29 may, for example, be a spray bar with a plurality of outlet openings or nozzles, with which a kind of water curtain is produced.
  • the supply of the sprinkler 29 takes place via a supply line 30 a water tank 31 at the ground milling machine 2.
  • the water discharged from the sprinkler 29 falls in the present embodiment on the transported over the loading conveyor milled material.
  • the sprinkler 29 intercepted dust particles are thus unloaded accordingly along with the milled material on the discharge point 9.
  • the cleaning of the dust-laden air of the ground milling machine 2 is thus carried out in two stages in the present embodiment, wherein the electrostatic precipitator 12 of the sprinkler 29 is upstream in the flow direction of the dust-laden air.
  • FIG. 3 Finally, the structure and the arrangement of the electrostatic precipitator 12 are further illustrated in a schematic representation.
  • the electrostatic precipitator 12 itself is shown in solid lines.
  • Essential elements of the electrostatic precipitator 12 are a box-like housing 32 and disposed within the housing 32 charging plates 33, which form the charging stage 21.
  • the housing 32 is formed with a longitudinal extent parallel to the longitudinal extent of the loading conveyor belt 11 indicated by dashed lines and thus forms a parallel to the conveyor channel 18 extending flow shaft 47 for the dust-laden air to be cleaned.
  • the charging plates 33 extend in the longitudinal extent of the housing 32 and the flow shaft 47.
  • the charging plates are connected as the anode 34 and the housing 32 accordingly as the cathode 35. The charging plates thus form the charging stage 21 and the housing 32 of the electrostatic precipitator the separation stage 22 of the electrostatic precipitator 12th
  • the supply of sucked on the pumping device 13 dust-laden air takes place from the top of the housing 32 via a corresponding feed opening 36.
  • the supply from the side via an optional opening 36 ' is possible.
  • the electrostatic charge of the dust particles thus takes place via the charging plates 33, which extend sufficiently spaced from the housing 32 also in the longitudinal direction of the housing 32. Accordingly, the electrostatically charged dust particles are attracted to the housing 32 and thus separate therefrom within the electrostatic precipitator 12.
  • the purified air is blown out of the electrostatic precipitator 12 via the outlet opening 37 into the delivery channel 18 above the loading conveyor belt 11.
  • maintenance flaps 38 are also attached to the long sides.
  • the maintenance flaps 38 can be opened so that access from the outside in the interior of the electrostatic precipitator 12 is possible. This may be desired, for example, for maintenance and / or cleaning purposes.
  • a closing state sensor 39 is provided, which is connected via a connecting line 40 to a corresponding control unit.
  • the control unit (not shown in the figures) is designed such that it forcibly interrupts the operation of the electrostatic precipitator 12 or its supply of electrical energy when the closure state sensor 39 signals that the maintenance flaps 38 are open. In other words, operation of the electrostatic precipitator 12 in the present embodiment is possible only when the maintenance flaps 38 are closed.
  • Fig. 3 illustrates the schematic structure of a single electrostatic precipitator 12. Included in the invention are also expressly variants in which two or more of these electrostatic precipitators 12 are arranged in particular connected in parallel, so that the extracted dust-laden air to the individual electrostatic precipitators 12 is supplied split. This also includes embodiments in which the plurality of electrostatic precipitators 12 are surrounded by a common housing.
  • the electrostatic precipitator 12 is further designed as a structural unit or as a module 55.
  • the module 55 comprises the housing 32, the charging stage 21, the separation stage 22 and unspecified connections for supply lines to the anode 34 and to the cathode 35 for connection to the machine 1.
  • the electrostatic precipitator 12 is on both sides or on two mutually releasable holding means 56 opposite sides on the conveying channel 18 (also the arrangement within the machine itself, as shown below, in particular also on or in the conveying channel 16, is possible) surrounding the housing.
  • the holding devices 56 may be, for example, screw connections, rail bearings, form-locking bearings, detent bearings, etc., or combinations thereof.
  • the electrostatic precipitator 12 can therefore also be easily dismantled or, conversely, retrofitted to existing machines. But it is also possible to obstruct the electrostatic precipitator 12 for permanent retention in the machine.
  • FIG. 4 illustrates the flow of a method according to the invention for operating a ground milling machine, in particular for reducing the dust load.
  • This method particularly relates to the operation of a ground milling machine, as in the FIGS. 1 to 3 shown.
  • Essential steps of the method according to the invention are first performing 42 of a milling process. During this milling process, considerable amounts of dust are produced.
  • conduction 43 of dust-laden air to an electrostatic precipitator 12 takes place. This can be done in particular via a suitable pumping device 13, in particular a suction fan, as described above, and corresponding connecting lines. Subsequently, charging and depositing of dust particles in the electrostatic precipitator 12 takes place within the electrostatic precipitator in step 44.
  • the method according to the invention provides particularly good cleaning results, in particular, when the charging and depositing of the dust particles in the air takes place in a space compartment separate from the conveying channel of the material to be milled.
  • the method according to the invention thus also includes a step in which the dust-laden air is separated, for example sucked, away from the milled material.
  • the cleaning result of the method according to the invention can be increased if the separation of dust particles by means of the electrostatic precipitator according to the steps 42 to 45 is followed by an additional cleaning stage 46, in which the air, for example, a water curtain, in particular a corresponding sprinkler, as described above, happens.
  • the air for example, a water curtain, in particular a corresponding sprinkler, as described above.
  • a pre-cleaning of the dust-laden air according to step 49 for example by a cyclone filter and / or a filter grid and / or a labyrinth filter stage.
  • a pre-cleaning of the dust-laden air according to step 49 for example by a cyclone filter and / or a filter grid and / or a labyrinth filter stage.
  • coarse-grained particles can be sucked in with the dust-laden air and reach the electrostatic precipitator 12.
  • the electrostatic precipitator 12 is here inserted into the interior of the machine 2.
  • the electrostatic precipitator 12 is thus surrounded by the body 50 or the outer skin of the machine 2 (the loading conveyor 11 is not part of the body 50).
  • the electrostatic precipitator in relation to the conveying path of the milled material has moved considerably closer to the milling drum box 14. He sits concretely above the transfer conveyor belt 10 within the machine-side conveyor channel 16 and thus substantially in the cavity within the body 50, in which the transfer conveyor belt 10 is arranged.
  • a protective grid 51 is further provided, which prevents coarser Fräsgutp
  • the protective grid 51 extends in a substantially horizontal plane.
  • the protective grid 51 thus represents a physical barrier for coarser particles of milled material for the protection of the electrostatic precipitator 12.
  • the electrostatic precipitator further comprises an apron 52 on its underside facing the transfer conveyor belt 10. This is reinforced and protects the overlying Elektroabscheider 12 from damage by the milled material.
  • the fender 52 extends over the entire length of the electrostatic precipitator 12 in the conveying direction of the milled material.
  • the pump device 13 is positioned behind the electrostatic precipitator 12 in the conveying direction of the dust-laden air.
  • FIG. 6 Another alternative embodiment is in FIG. 6 illustrated.
  • the electrostatic precipitator 12 is arranged on the machine side in the surrounded by the body 50 interior of the machine 2 integrated.
  • the electrostatic precipitator 12 is not seated within the delivery channel 16 but is placed above the delivery channel 16 without direct contact therewith in the interior of the machine.
  • a deflecting device 53 via which the dust-laden air is fed to the electrostatic precipitator 12, is also connected upstream of the electrostatic precipitator 12. It is essential that seen in the conveying direction of the milled material, a deflection of the dust-laden air using the deflection takes place. In fact, the dust-laden air is sucked in by the deflecting device 53 counter to the conveying direction of the milled material.
  • the deflection angle (angle between the conveying direction of the material to be milled and the direction of entry the dust-laden air in the deflection 53 ideally greater than 90 ° and especially greater 120 °.
  • a collection container 54 is further provided below the electrostatic precipitator 12. This can be used to clean the electrostatic precipitator 12. Tapped, deposited on the electrostatic precipitator 12 dusts can fall during cleaning by an unspecified connection opening between the electrostatic precipitator 12 and the reservoir 54 in this. By removing the collection container 54 from inside the machine, the separated dusts can then be disposed of separately.
  • the collecting container can either be used permanently in the machine 1 or can be used especially for cleaning work on the electrostatic precipitator 12.
  • Both electrostatic precipitators 12 are in FIG. 7 supplied by a common supply device 24 with electrical energy. It can be provided for both electrostatic precipitators 12 but also a separate, individual supply device 24. It is equally possible for the electrodes of the electrostatic precipitator to be connected to the supply device via a common supply line 24 to connect (in Fig. 7 for the electrodes 22 the case) or to provide individual supply lines (in Fig. 7 for the electrodes 21 the case). The latter has the advantage that an individual control of the two electrostatic precipitators 12 is easier, whereas for the first variant a lower installation effort is necessary. Usually, the electrodes of the two electrostatic precipitator 12 in Fig. 7 all individually or in pairs connected to the supply device 24 together.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
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  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Separation (AREA)
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  • Processing Of Solid Wastes (AREA)

Claims (16)

  1. Engin (2) de fraisage du sol, en particulier engin de fraisage de chaussée, destiné à retirer un matériau du sol, comprenant :
    - un cadre (46) de machine ayant un châssis,
    - un tambour (15) de fraisage attache sur le cadre (46) de machine, et
    - un dispositif de transport (8) ayant au moins une courroie transporteuse, qui est configuré pour transporter le matériau retiré du sol dans une direction de transport partant du tambour de fraisage (15) et allant jusqu'à un point de décharge (9),
    caractérisé en ce que
    il comprend un précipitateur électrostatique (12), au moyen duquel la poussière générée pendant l'opération de fraisage et/ou pendant le transport du fraisat peut être précipitée, il comprend un dispositif de pompage (13), au moyen duquel de l'air chargé de poussière peut être transporté, le dispositif de pompage (13) étant configuré de telle sorte qu'il amène l'air chargé de poussière jusqu'au précipitateur électrostatique (12),
    un conduit d'écoulement (47) est présent, à travers lequel est acheminé l'air chargé de poussière en utilisant le dispositif de pompage (13),
    le précipitateur électrostatique (12) est agencé avec au moins un étage de charge (21) et au moins un étage de précipitation (22) à l'intérieur du conduit d'écoulement (47),
    l'étage de précipitation (22) est un logement (32) du précipitateur électrostatique (12).
  2. Engin (2) de fraisage du sol selon la revendication 1,
    caractérisé en ce que
    le précipitateur électrostatique (12) est disposé au niveau du dispositif de transport (8), en particulier au niveau d'une courroie transporteuse suspendue (11).
  3. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le dispositif de transport (8) comprend une courroie transporteuse de transfert (10) et, en aval de celle-ci dans la direction de transport, une courroie transporteuse de chargement (11), et en ce que la courroie transporteuse de chargement (11) comprend une partie machine (26) et une partie repliable (27), la partie repliable (27) étant repliable sur la partie machine (26), et le précipitateur électrostatique (12) étant disposé au niveau de la partie machine (26).
  4. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    il comprend un corps de machine, le précipitateur électrostatique (12) étant agencé à l'intérieur du corps de machine.
  5. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    il comprend au moins une courroie transporteuse de transfert, sur laquelle du fraisat transporté hors du caisson du tambour de fraisage est directement transféré et via laquelle le fraisat est transporté hors de l'intérieur de l'engin, un conduit étant présent pour recevoir la courroie transporteuse de transfert, et le précipitateur électrostatique étant au moins partiellement disposé à l'intérieur de ce conduit.
  6. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le dispositif de pompage (13) est un dispositif d'aspiration.
  7. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le dispositif de pompage comprend un dispositif d'aspiration au moyen duquel l'air chargé de poussière est aspiré du fraisat et du voisinage direct de celui-ci, le dispositif d'aspiration étant en particulier configuré de telle sorte que la direction d'aspiration soit au moins partiellement en sens inverse de la direction de transport du fraisat sur le côté de l'entrée vers le dispositif d'aspiration.
  8. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le conduit d'écoulement (47) comprend en particulier au moins l'une des caractéristiques suivantes :
    - le conduit d'écoulement (47) est au moins partiellement séparé spatialement d'un canal de transport (16, 18) entourant au moins partiellement la courroie transporteuse (10, 11), et/ou
    - le conduit d'écoulement est au moins partiellement intégré dans un canal de transport (16, 18) entourant la courroie transporteuse, et/ou
    - le côté sortie du conduit d'écoulement (47) aboutit dans le canal de transport (18) au-dessus de la courroie transporteuse (11), et/ou
    - le conduit d'écoulement est suivi d'une ligne de raccordement à travers laquelle l'air sortant du conduit d'écoulement est acheminé jusqu'au canal de transport (18) et/ou son entourage extérieur, et/ou
    - le conduit d'écoulement (47) est disposé sur le canal de transport (18) ou à l'intérieur d'un corps de machine.
  9. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'étage de charge (21) est une anode (34) et l'étage de précipitation (22) est une cathode (35)
  10. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'étage de précipitation (22) comprend au moins l'une des caractéristiques suivantes :
    - c'est un logement (32) du précipitateur électrostatique (12), qui est conformé en conduit d'écoulement (47) ;
    - il comprend des éléments de précipitation qui s'étendent longitudinalement à la direction d'écoulement principale ;
    - il comprend un élément de précipitation s'étendant au moins partiellement en angle par rapport à la direction d'écoulement principale ;
    - il comprend un élément de précipitation prenant la forme d'une plaque ou d'une grille ;
    et/ou l'étage de charge (21) comprend au moins l'une des caractéristiques suivantes :
    - c'est un fil métallique, un treillis métallique ou une structure en forme de plaque ;
    - il s'étend dans la direction longitudinale de l'étage de précipitation (22), en particulier le long du conduit d'écoulement (47) ;
    - il s'étend dans la direction d'écoulement de l'air chargé de poussière ;
    - il comprend au moins une sous-zone s'étendant essentiellement de manière transversale à la direction d'écoulement de l'air chargé de poussière.
  11. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    un dispositif de nettoyage (23), en particulier un dispositif interrupteur, inverseur de polarité, à buse, vibrant et/ou secoueur, est présent, au moyen duquel la matière adhérant au précipitateur électrostatique (12) peut en être retirée, le dispositif de nettoyage (23) comprenant en particulier une ouverture de décharge ou un volet de décharge, par laquelle/lequel le matériau enlevé par l'étage de précipitation peut être retiré du précipitateur électrostatique (12), en particulier sur la courroie transporteuse (11), l'ouverture ou le volet de décharge étant très spécifiquement configuré(e) de manière à créer un passage de communication, en particulier vertical et/ou direct, entre le précipitateur électrostatique et un espace libre situé directement au-dessus de la courroie transporteuse (11).
  12. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    au moins un volet de maintenance (38) est prévu dans un logement (32) du précipitateur électrostatique (12), grâce auquel l'accès à un espace interne du précipitateur électrostatique (12) est possible.
  13. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le précipitateur électrostatique (12) comprend au moins l'une des caractéristiques suivantes :
    - il prend la forme d'un module, comportant au moins un dispositif de raccordement pour raccorder un dispositif d'alimentation en énergie, en particulier côté machine ;
    - il comprend un dispositif de maintien détachable pour l'assujettir à l'engin de fraisage du sol, comprenant en particulier au moins l'une des caractéritisques de rail de guidage, et/ou de complémentarité de forme, et/ou de dispositif de fixation par serrage.
  14. Engin (2) de fraisage du sol selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    il comprend au moins l'une des caractéristiques suivantes ;
    - le précipitateur électrostatique (12) comprend un capteur d'état de fermeture (39), par l'intermédiaire duquel l'état de fermeture d'un volet de maintenance (38) peut être contrôlé ;
    - le précipitateur électrostatique (12) est raccordé au réseau électrique de l'engin (2) de fraisage du sol afin d'être alimenté en énergie électrique, en particulier en utilisant un convertisseur interconnecté ;
    - un dispositif (29) de pulvérisation d'eau est présent, en particulier en relation avec la direction d'écoulement de l'air déplacé par le dispositif de pompage (13) dans la zone située derrière le précipitateur électrostatique (12), et tout particulièrement dans la zone de la courroie transporteuse de chargement (11) ;
    - un étage de pré-filtration pour la précipitation de particules pratiquement grossières est présent, qui est raccordé en amont du précipitateur électrostatique dans la direction d'écoulement, dans lequel l'étage de pré-filtration est tout particulièrement un séparateur à cyclone et/ou une grille et/ou un étage de filtre à labyrinthe ;
    - un étage de post-filtration pour la précipitation, en particulier de matière particulaire, est présent, qui est raccordé en aval du précipitateur électrostatique dans la direction d'écoulement, l'étage de post-filtration étant en particulier un autre filtre électrique.
  15. Procédé d'utilisation d'un engin (2) de fraisage du sol, en particulier selon l'une quelconque des revendications 1 à 14, comprenant les étapes de :
    a) réalisation (42) d'un processus de fraisage ;
    b) acheminement (43) de l'air chargé de poussière vers un précipitateur électrostatique (12) ;
    c) chargement et précipitation (44) de particules de poussière dans le précipitateur électrostatique (12) ;
    d) évacuation par soufflage (45) de l'air nettoyé.
  16. Procédé selon la revendication 15,
    caractérisé en ce que
    il comprend au moins l'une des étapes de procédé suivantes :
    - à l'étape b), l'évacuation par aspiration de l'air chargé de poussière hors du caisson (14) du tambour de fraisage et/ou d'un canal de transport (16, 18) pour du fraisat est réalisée, et/ou
    - à l'étape c), le chargement et la précipitation sont réalisés dans un conduit d'écoulement (47) du précipitateur électrostatique (12) courant séparément du canal de transport (16, 18), et/ou
    - le passage (46) à travers un silencieux à eau est réalisé en aval du chargement et de la précipitation des particules de poussière dans le précipitateur électrostatique (12) dans la direction d'écoulement de l'air, et/ou
    - une précipitation des particules grossières avec un étage de pré-filtre est réalisée en amont du chargement et de la précipitation des particules de poussière dans le précipitateur électrostatique (12) dans la direction d'écoulement de l'air.
EP17000478.2A 2016-03-31 2017-03-22 Fraiseuse de sol, en particulier engin de fraisage de chaussée destiné à enlever de la matière du sol et son procédé de fonctionnement Active EP3225738B1 (fr)

Applications Claiming Priority (1)

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DE102016003895.0A DE102016003895A1 (de) 2016-03-31 2016-03-31 Bodenfräsmaschine, insbesondere Straßenfräse, zum Abtragen von Bodenmaterial sowie Verfahren zum Betrieb einer Bodenfräsmaschine

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EP3225738A1 EP3225738A1 (fr) 2017-10-04
EP3225738B1 true EP3225738B1 (fr) 2018-11-21

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US (2) US10301782B2 (fr)
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US20170284038A1 (en) 2017-10-05
US10731304B2 (en) 2020-08-04
US10301782B2 (en) 2019-05-28
EP3225738A1 (fr) 2017-10-04
CN111945535A (zh) 2020-11-17
DE102016003895A1 (de) 2017-10-05
US20190257042A1 (en) 2019-08-22
CN107268406A (zh) 2017-10-20

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