Rear loading road milling machine with height adjustable sealing device

0001The present invention relates to a rear loader road milling machine with a Milling roller which is arranged in a downwardly open cylinder housing, wherein pointing in the direction of travel opening between the front part of the Roller housing and the road surface with a height adjustable Sealing device may be closed.

0002In the area of ​​road construction, especially in the repair and maintenance traffic areas, mainly road milling machines are now to Processing of traffic areas used.

0003The known road milling machines have substantially the hereafter -described structure. The road milling machine comprising a chassis, which on is supported wheels or crawler tracks. Further, in the chassis a Milling roller is provided which is disposed within a roller housing, which is downward, ie in the direction of the road surface, open. To the milled Material, which is hereinafter referred to as milled material, transported the known road milling machines often a transport device via which the milled material an accompanying truck with appropriate loading area can be supplied. If the milled material on the rear of the road milling machine supplied to the truck, then one speaks of a rear loader, while from a front loader is used when the milled material via the front Road milling machine is transported to the truck.

0004To edit the road surface, the known road milling machines lowered towards the road surface, so that the rotating and from the Roller housing protruding milling roller in engagement with the road surface comes, the lowering is generally carried out via a lifting of the wheels on where the chassis of the road milling machine is supported.

0005Due to the sometimes relatively high rotation speeds of the milling drum that is removed from the Pavement out milled milled material greatly accelerated. This involves in particular in work safety standpoint problems because umstehendes Working personnel can be injured by hurled milled material. Moreover, it is possible that the milled material ejected under the Chassis unit bearing wheels, whereby not only the wheels damage itself, but also the cutting depth and the milling pattern can be changed. If that ejected milled material comes to lie outside of the milling track, it is no longer covered by the stripping. The milled material then has a Sweeper be included, what an additional operation requires. In order to overcome these drawbacks, have been in the Past diverse attempts thrown out to prevent the milled material, which are explained below.

0006To prevent lateral ejection of the milled material, come today mainly road milling machines used whose roller housing on both sides Height-adjustable side plates, having the so-called edge protection. This System has proven itself, especially since the lateral ejection of the milled material on Due to the rotation direction of the milling drum only of minor importance.

0007To prevent the cut material to the rear, so the rearward direction is thrown out, stripping are used in various applications, consisting essentially of a plate-shaped scraper behind the Milling drum is located, and their main task is on the milled surface strip backward milled material, making it the Transport means can be supplied and not on the machined surface remains.

0008One problem is the area turns in the direction of travel in front of the milling drum. Here is particularly at low cutting depths a large opening between the front part of the roller housing and the road surface, through which the Milled material may be thrown forward and to the sides. Around To overcome this problem, were described in the following taken action.

0009So for example, describes the DE 197 39 915 C2 a Bankettfräsaggregat in the rigidly in the direction of travel in front of the milling drum, a protective and baffle arranged that a large part of the thrown forward milled material intercepting or redirecting toward the rear of the known unit. The However, known unit has the disadvantage that the cutting depth on the basis of is restricted rigid arrangement of the protection and baffle. Furthermore remains between the lower edge of the protection and the baffle plate and the Ground pointing in the direction of travel opening through which further milled material may be thrown forward and to the sides.

0010To address the above problem, were rubber aprons developed, which, starting from a front part of the roller housing by extend below. Such rubber aprons are designed to be flexible, so that they in response to the lowering of the road milling machine, and thus the can deform milling depth. The rubber aprons should mentioned during Milling process always rest against the road surface regardless of the depth of cut, so that there is no opening between the front part of the roller housing and the Pavement remains. A disadvantage, however, that the said skirt particular at low cutting depths - in practice only an inadequate provide sealing against the milled material ejected. To tilt the Aprons thereto to deform wave, so that a dense not plant given is. Incidentally, the aprons are subject to high wear.

0011Since rubber skirts ensure an inadequate seal, were developed plate arrangements in which a rigid, generally metallic shield in vertical guides perpendicular to the to be processed before the pavement Opening between the front part of the roller housing and the road surface can be performed. The shields are known depends on the Cutting depth adjustable in height, the adjustment via plug pins or the suspension is achieved on a chain. Although, the use Shields, particularly at low cutting depths, greater stability to the apparent swirled milled material on, but always remains a - albeit low - distance between the sign and the road surface so that further Parts of the milled material being thrown forward and to the sides can. This is due to the fact that the known signs not directly may rest against the road surface, as this case of irregularities Road surface, eg for ripple of the road surface or when crossing existing milling tracks, one to a disability, if not to Blocking of the feed leads what the on tilting the shield with Pavement is due.

0012The present invention is thus based on the object, a rear loader road milling machine with a sealing device for a forward facing facing opening between the front part of the roll housing and the to provide pavement which vibrated a secure protection against forward Milled material in compliance with the predetermined feed of the milling drum guaranteed.

0013The problem is solved with the features specified in claim 1 Features. Advantageous embodiments of the invention are the subject of Subclaims.

0014The road milling machine according to the invention is a so-called rear loader formed, ie the milled material is on the rear of the road milling machine via a corresponding transport device removed. The road milling machine has a milling drum, in which a downwardly open cylinder housing is arranged. A pointing in the direction of opening between a front Part of the roller housing and the road surface can with a Sealing device are closed. The sealing device may be adjusted in height. According to the invention, the sealing device for vertical adjustment about an axis in the direction of travel in front of the milling drum, are pivoted.

0015Due to the pivotability of the sealing means about an axis, which in Direction is arranged in front of the milling drum, it is possible that to pivoting sealing device down to the pavement, so that no gap between the front part of the roller housing and the Pavement remains to be ejected through the cut material forward could. Moreover, the sealing device according to the invention can in Unlike the prior art vertically displaceable baffles not with the Pavement tilt. Rather, the sealing device is through the special suspension slidably pulled over the road surface, so that during Irregularities such as roughness of the road surface or by existing milling tracks, the course of these irregularities by pre- and Swinging back follows. An interruption or even blocking the Feed by canting characterized. Even compared to the Rubber aprons, the inventive sealing device benefits. So is not the contact pressure on the road surface of the sealing device more dependent on the depth of cut, as in deformable rubber apron the case is. Rather, with the sealing device of Road milling machine according to the invention independently of the routing depth constant pressure on the road surface are applied, so that even at low cutting depths being thrown out of the milled material is prevented.

0016In an advantageous embodiment of the invention Road milling machine, the sealing means a opening facing baffle plate on. Such a baffle plate may be made, for example, Metal, as well as the roller housing.

0017In a particularly preferred embodiment of the invention Road milling machine, the sealing device on an arm. The swing arm is a part fixed to the baffle plate and extending on the other hand to the axis about which pivots the sealing device can be. Of course instead of a swivel arm can also two or more pivot arms be provided. For example, could a his arrangement makes sense in the two pivot arms are provided, one of which End of which extends respectively to the side ends of the impact shield and their other end of which is guided rotatably on the ends of the axis.

0018In an advantageous embodiment of the invention, the baffle plate a circular arc-shaped cross-section. Particular preference here is that the Radius of the circular arc-shaped cross-section the distance between the axis and the baffle plate corresponds. In this way, the baffle plate in each Point to the same distance to the axis. Thus, the baffle plate regardless of the pivot position is always in contact with the stimseitigem front part of the roll housing stand without additional aids would be required, the amended and a distance between the drum housing would compensate baffle plate.

0019In a particularly preferred embodiment of the invention Road milling machine, the sealing device under constant Forming a line of contact with the front part of the roller housing to the Axis can be pivoted.

0020In order to increase the density in the range of the aforementioned line of contact or to prevent wear of the adjacent parts is on the roll housing along the contact line in a particularly preferred Embodiment an elongated sealing or stripping provided. This may be for example, a rubber band, wherein the sealing or stripping advantageously exchangeable should be to replace worn elements to new ones.

0021In a further advantageous embodiment of the invention Road milling machine, the sealing means at least one of the Pavement facing on skid. One or more skids allow for easier sliding of the sealing means over the Pavement. It is particularly advantageous when the skid or Skids in the direction of travel of the road milling machine extend.

0022To any unevenness on the road surface with the skid capture can, the runner extends in a preferred embodiment of Invention over the entire width of the sealing device.

0023In a further advantageous embodiment of the invention Road milling machine is curved down the skid. is In this way, ensured that the skid during pivoting over their entire length to the pavement rolls and not by leaps and bounds only on one of its ends rests, as would be the case with straight skids. Thus, a uniform wear on the skids ensures that increased to a Life of the skids leads.

0024In a further advantageous embodiment of the invention, the Sealing means to form a line of contact with the Pavement against the pavement are pivoted.

0025In order to keep the wear of the sealing device low is in a further preferred embodiment, along the contact line of the Sealing device and the road surface provided a sliding bar.

0026In a further embodiment of the invention, the sliding skid and / or Sliding bar to be substituted to worn skids or sliding strips to exchange with new runners or sliding strips.

0027Preferably, the skid and / or wear strip is made of hardened Material which has a greater hardness than the material of the other constituents having sealing means, so that with the road surface in contact Related skid or slide strip is subject to little wear.

0028In a particularly preferred embodiment of the present invention , the sealing means with a predetermined pressure against the Pavement are pivoted. This has the advantage that the Sealing means not already in every small obstacle, such as For example, on the pavement remaining parts of milled material, upwards is pivoted. Rather, the softer barriers by the be crushed or squashed applied pressure. The pressure itself can for example by a spring element, which acts on the sealing means, be or simply applied by the weight of the sealing device.

0029In addition, to the above-mentioned embodiment Sealing means in a further embodiment of the invention in Exceeding the predetermined pressure to be swung back. Thus follows the sealing means the harder and larger bumps and Obstacles, but without lifting the pavement.

0030It is particularly preferred, the sealing device by means of a hydraulic to be able to pivot about the axis. In a particularly advantageous Embodiment of the road milling machine according to the invention may be a constant hydraulic pressure can be set, the hydraulics Pivoting back of the sealing device allows, when the predetermined pressure is exceeded. This can, for example, with reference to a Pressure relief valve within the hydraulic occur.

0031Advantageously, the sealing device in different Pivot positions are locked. Thus, the sealing means pivoted back, for example, in a transport position and locked, in which the sealing device is not resting on the road surface. The Locking can be effected by conventional means such as a chain suspended or Stakeout with bolts. Preferably can carried out the locking by means of hydraulics.

0032The invention on the basis of embodiments, with Reference to the accompanying figures incoming explained.

0033Show it:<dl tsize="6" compact="compact"><dt>Fig. 1</dt><dd>a schematic representation of one embodiment of the invention Rear loader road milling machine in side view,</dd><dt>FIG. 2</dt><dd>a section of Fig. 1 in partial cross section, said Position the sealing device is shown at low milling depth,</dd><dt>Fig. 3</dt><dd>a section of Fig. 1 in partial cross section, said Position the sealing device is shown at a larger depth of cut, and</dd><dt>Fig. 4</dt><dd>a perspective view of the sealing device of Figs. 1 to 3.</dd></dl>

0034Fig. 1 shows the schematic representation of an embodiment of the inventive rear loader road milling machine 2. The road milling machine 2 comprises a chassis 4, which in the present embodiment three is wheels 6, 6, 8 supported, wherein the two rear wheels 6, 6 (only one in FIG. 1 see) laterally in the area at the rear and the front wheel 8 centrally in Area of ​​the front side of the road milling machine 2 is arranged. The rear wheels 6, 6 are adjustable in height by means of a hydraulic, the regulation of Road milling machine 2 via the front wheel 8, the vertical to a Axis A can be rotated. Alternatively, such a road milling machine 2 in place of the wheels 6, 6, 8 are also supported by chain drives. Also can vary the number of foreseen wheels or crawler tracks.

0035Within the chassis is also at least one drive device for a Milling roller, the wheels 6, 6, 8 and the hydraulic is provided, as well as from the Prior art known ancillaries, which made their presentation Clarity is to be dispensed.

0036The platform 10 is provided above the rear of the road milling machine 2, where among other things, a seat 12 for the operator and a Steering device 14 to steer the front wheel 8 is.

0037Below the driver's cab 10 is a roller housing 16, thus is arranged in the region of the rear end of the road milling machine the second The Roller housing 16 is a downward, ie in the direction of the road surface 18, open housing in which a milling drum is located 20 wherein the Longitudinal axis of the milling roller 20 extends transversely to the driving direction, which in Fig. 1 is shown hand of the arrow a. The milling roller 20 projects out of the cylinder housing 16 projecting downward toward the pavement 18th

0038The road milling machine 2 according to the invention can, for example, with a be provided Fräswalzenschnellwechselsystem, with the replacement of the Milling drum 20 by a milling drum with lesser or greater milling width or other by a milling drum assembly with little time and assembly costs is possible.

0039At the rear in the driving direction a the end of the cylinder housing 16 is a height-adjustable stripping means 22 is provided. In the direction of a past the scraper 22 is again provided a transport device 24, on the milled milled material an accompanying truck with appropriate Loading area can be fed (not shown). Since the milled material via the Heck the road milling machine is supplied to the truck, it is - as mentioned - a so-called rear loader road milling machine.

0040In the direction of a front of the milling 20, a sealing device 26 provided that detail with particular reference to Figs. 2 to 4 will be explained.

0041The roller housing 16 has a direction of travel on in a front part 28, which in usually formed by a continuous plate. As this front part 28 must not come into contact with the road surface 18, which inevitably leads to damage to the front part 28 or disability of would result in feed direction a, remains between the front Part 28 and the road surface 18 is always a forward opening B. This opening B is inventively achieved by the sealing device 26 closed.

0042The sealing device 26 is adjustable in height, while the Height adjustment about an axis C, the forward facing a front of the milling 20 is disposed, can be pivoted, as at hand of the arrow b is shown.

0043In the illustrated embodiment, a sealing means 26 the opening B facing baffle plate 30 which extends over the entire width of the roll housing 16 and thus over the entire width of the milling drum 20 extends. Further, the sealing device 26 includes a swing arm 32, the remote at the port B side of the baffle plate 30 is fixed and extends in the direction of travel a forward to the axis C, where the supported pivot arm 32 about the axis C in a pivotable suspension 34 is, in turn, is arranged on the chassis. 4

0044The sealing device 26 further includes a reinforcing rib 36, the transversely across the opening B of the opposite side of the baffle plate 30 extends. On this reinforcing rib means further 38 for connecting the Sealing device 26 with the piston / cylinder assembly 40 of a not shown in more detail hydraulics to raise and lower the Sealing device 26 is provided.

0045The baffle plate 30 has a circular-arc cross section, the Radius of the circular arc-shaped cross section of the distance D between the C axis and the baffle plate 30 corresponds to (see Figure 4).

0046Upon pivoting of the sealing device 26 about axis C constitutes the Sealing means 26 or its baffle plate 30 permanently a contact line 42 with the front part 28 of the roller housing 16, so that no through consists of projecting flung milled material. Under permanently in this to understand the context that the contact line 42 regardless of the Pivot position of the sealing device 26 remains in place. to to ensure particularly high sealing, is mounted to the roll housing 16 and the front part 28 along the contact line 42 an elongated Sealing or wiping element 44, which is advantageously mounted interchangeably.

0047To a particularly good sliding of the sealing means 26 on the to ensure road surface 18, the sealing means 26 a the Pavement 18 facing skid 46 which starting of from the Opening B opposite side of the baffle plate 30 in the direction of travel a extends. The preferably made of hardened material and replaceable Skid 46 is curved downward so that an unwinding of the runner 46 the road surface 18 during pivoting of the sealing device 26 and thus uniform wear is ensured. In the illustrated Embodiment extends the runner 46 along the bottom of Pivot arm 32, so that no additional support of the runner 46 is required.

0048After the sealing device 26 is pivoted against the pavement 18 was, this forms with the road surface 18 from a contact line 48th To the Wear of the sealing device 26 in the region of the contact line 48 low keep, is to the sealing device 26 has a sliding bar 50 along the Contact line 48 is provided. In the illustrated embodiment extends the slide strip 50, preferably made of hardened material and is interchangeably arranged along the bottom, the road surface 18 facing edge of the baffle plate thirtieth

0049Referring to FIGS. 2 and 3, in the following, the operation the rear loader road milling machine according to the invention 2 described.

0050In order to remove the pavement 18 by the road milling machine 2, First, the wheels 6, 6 raised to the with the cutting edges (not shown) tipped milling drum 20 to bring the road surface 18 in engagement. The Milling roller 20 is rotated in this case in a direction of rotation c, which the Direction of rotation of the wheels 6, 6, 8 opposed. Once the milling drum 20 is brought into engagement with the road surface 18, the milled material is removed, the thrown within the roller housing 16 on the milling drum 20 rearward is, as is illustrated on hand of the arrow d. From there, the milled material from entering the transport device 24 that the milled material an unspecified shown Support vehicle supplies.

0051In order to prevent milled material thrown through the opening B forward is, the sealing device 26 via the hydraulic system, which in the hand Piston / cylinder assembly 40 is indicated, with a predetermined pressure pivoted against the pavement 18th The sealing device 26 forms in this position, on the one hand the line of contact 42 with the front part 28 of the Roller housing 16, and on the other hand the line of contact 48 with the road surface 18 , whereby the opening B between the front part 28 of the roller housing 16 and the road surface 18 completely through the baffle plate 30 of Sealing device is closed 26th On both small depths of cut (Fig. 2) as well as large cutting depths (FIG. 3) is thus always a reliable seal guaranteed.

0052If the predetermined pressure between the sealing device 26 and the Pavement exceed 18, which for example in order to detect unevenness due road surface or an increase in the depth of cut (Fig. 2 to Fig. 3) is, the hydraulic system is designed so that this pivoting back the Sealing means 26 allows about the axis C.

0053Due to the ability to pivot about an axis C, the front in the direction of travel a the milling roller 20 is arranged, it is the sealing device 26 possible, To follow all the bumps in the road surface 18 and all adapt to change the milling depth, wherein neither the protection against forward vibrated milled material nor reduces a constant feed of the milling drum is hindered.

0054Advantageously, the sealing device 26 in different Pivot positions locked. So for example it is advantageous if the Sealing device 26 in a raised position in which they do not the road surface 18 rests can be locked, so that the Road milling machine 2 by means of a transport vehicle to the site can be transported. To lock the sealing means 26 are All known prior art devices used.