DE2853601A1 - ASPHALT PAVER - Google Patents

Description

Asphalt paver

The invention relates to a machine for laying asphalt pavements with a rear unit for compacting and smoothing the asphalt sheet to be laid with the machine, in front of the rear unit a device is provided for spreading the asphalt material, which is formed with the aid of a scraping plate a flat track is dressed before the Asphalt material with the help of the rear unit

25 is sealed and smoothed.

They are rear units with a relatively slow working unit located at the front of the unit Known stamping rail, which moves in a plane at right angles to the longitudinal direction of the asphalt track. It are also known units of this type with a plate, the plank, which in the vertical direction vibrates quickly = Finally, there are units with a combination of the aforementioned compacting and smoothing devices known »The invention relates to rear

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Deutsche Bank (Munich) Account '51 / 61070

Dresdner Bank (Munich) Account 3939844

Postal check (Munich) account 670-43-604

28 6j601

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Compaction and smoothing units with vibration drive.

The rear units of ceiling pavers are usually extendable in the transverse direction, so that asphalt sheets in a width of up to 12m can be relocated. The problem here, however, is that in the previously known machines only for the main screed, but not a vibration drive is provided for the connectable widening parts by the previously known machines are constructed as rigid units. This has the consequence that in the broad back Unit standing vibrations can occur, which vibrate maximally in some places, in other places but not at all. The asphalt surface produced is therefore inhomogeneous.

The purpose of the present invention is to provide an asphalt paver with which one is similar compacted and smoothed asphalt track can be produced.

This purpose is achieved according to the invention in that the compaction and smoothing unit is in sections is divided, each connected to the machine via vibration-damping organs and each with independent Vibrating organs are provided. By dividing the rear unit into several terms the vibration work, independent sections, standing vibrations in the unit are prevented.

The features specified in claim 2 ensure that the amplitude of vertical vibrations increases the front edge of a section is greatest where the asphalt has not yet been compacted, while the The amplitude at the rear edge of the section is smaller,

where the asphalt material is already compacted. 35

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ORIGINAL

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] Since each section can vibrate parallel to the longitudinal direction of the asphalt pavement, those at the front Edge and the vibration damper provided on the rear edge have the same amplitudes in the longitudinal direction

/ j the asphalt track ensure what is expedient by the embodiment according to claim 3 is achieved.

In the construction characterized in claim 4, the amplitude is still at the front edge of the section larger compared to the amplitude at the rear edge.

In the embodiment of the vibration eccentric specified in claim 5, the vibration amplitude is the Section according to the thickness of the ceiling and the consistency of the asphalt material can be easily regulated.

The measures specified in claim 6 further improve the evenness of the asphalt track, by this shape of the scraper plate in connection with the special vibration direction both as a rail for Dressing the asphalt acts like a plow, which gives the asphalt material an overturning motion, whereby the Always avoid piling up the same material in front of the plate. This will result in the laid asphalt material a constant temperature and consequently a more even ceiling membrane is guaranteed.

The guide plates specified in claim 7 further promote the even distribution of the ceiling material before compacting and smoothing it.

The invention is explained in more detail below with reference to the drawing. Show it:

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Fig. 1 schematically and in side view a

Embodiment of the machine according to the invention for laying asphalt sheets,

. Fig. 2 schematically shows the rear unit of the

Machine, seen from behind,

Fig. 3 is a section along the line III-III in

Fig. 2, and
10

4 shows an embodiment of the vibration device.

Fig. 1 shows schematically an asphalt paver known design, with a vehicle 1 with a drive, which is preferably partly the machine moves in the direction of travel K and partly a hydraulic Pressure generated to control the moving parts mentioned below. The machine is by means of controlled by a control panel 2 and has a platform for the Äsphaltmaterial 3. One in the machine provided conveyor belt feeds material from the material supply 3 obliquely downwards to a distribution screw 4, behind the one that extends over the entire width of the machine rear unit 5 of the machine for compaction and smoothing the material is provided to form the finished asphalt sheet. The back unit • 5 is attached to a spar 6 on both sides of the machine, the free end of which can be swiveled on the machine base frame

3Ö bar is stored that the rear unit 5 with Can be adjusted in height with the aid of a hydraulic cylinder that swivels the handlebar Fig. 2 can be seen symmetrically around the machine center plane M in the direction of travel and has both sides

^ tig the line M a basic screed 8 and one itself laterally to this adjoining side plank 9, the

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for example, to increase the width of the laid asphalt sheet in the lateral direction hydraulically and is retractable.

Fig. 2 shows to the left of the vertical longitudinal center plane M of the machine, a main screed 8 and a Side screed extended slightly to the left 9. The main screed 8 sits on a rigid frame 10 which is attached to the spar 6, which is over the main plank protrudes to the rear and on its protruding rear part a rigid frame 11 for the side screed 9 carries, which is thus located immediately behind the main plank and parallel to it is movable. For this purpose, one or more smooth axles are at the ends of the frame 11 18 attached, which are slidably mounted in sockets at the end of the spar 6. With the help of a not shown hydraulic drive device, the frame 11 in any position between one of the largest possible Brought width of the laid asphalt track corresponding end position and an inner end position in which the width of the asphalt track corresponds to the width of the basic screed 8. The two frames 10 and 11 are apart from the lateral displaceability of the frame 11 in relation to the frame 10 otherwise rigidly connected to one another. Of course, this also applies to those not shown two frames 10 and 11 on the right side of the vertical machine longitudinal center plane M. The smooth and Is the compaction unit of the asphalt paver according to the invention divided into several sections. In the illustrated embodiment, each frame or 11 a smooth and compacting section 12 or assigned. The sections are connected to the frame in question via vibration dampers, of which in Fig. 2 only two vibration dampers 14 and 16 for the Basic screed section and two vibration dampers 15 and 17 for the side screed section.

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places are. There is a separate vibration drive for each section intended. The vibration dampers prevent interaction between the vibrations the individual sections as well as the transmission of the vibrations to the rest of the machine the spars 6. The sections are dimensioned so that standing vibrations with nodes on the sections do not can occur, so that the asphalt material is similar from the entire smooth lower section surface is applied. The purpose of preventing the sections from overlapping on the rest of the machine is Purpose to reduce wear and tear.

Fig. 3 shows a section along the line III-III in Fig. 2 by a vibration damper, which consists of a front part 17A and a rear damper part 17B exists. Fig. 3 applies with regard to the smooth and Compression section 13 also for any corresponding section cuts, while the upper frame 11 to a of the lateral sections, showing two smooth axles 18, 19 supporting the section 13, which slide in sockets which are fixedly arranged in relation to the frame 10 according to FIG. The sockets preferably do not protrude over the main plank 8 addition, so that the smooth axes 18, 19 a little longer are than the frame 11. The difference in length corresponds to the length of the socket.

^{The smooth and compacting ou} section shown in FIG. 3 has a front, concave scraping plate 20 and a flat smooth and compacting plate 21 at the bottom. The scraping plate 20 and the bottom plate 21 are with the help of plates 22 (of which only one is shown) and by means of a longitudinal

direction extending profile body 23 struts, the carries a vibration transmitter 24 with eccentric weights,

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which revolve in the direction of arrow P, whereby the section 13 both horizontally and vertically a vibrating motion is given. According to the invention, the section 13 has vibration damping vibration dampers supported on the frame 11. Vibration dampers arranged on the front edge have the same structure all of the vibration damper 17A in Fig. 3, while rear vibration dampers in their construction all of the Vibration damper 17B correspond. The vibration damper 17A has a bushing 25 fastened to the strut plate 22 in which an elastic sleeve 26 is provided with a hole for an axle 27, which has two flanges at both ends is attached, of which, however, only one flange 28 is shown in the drawing on the frame 11. Of the Vibration damper 17B also consists of a bush 29 fastened to a flange 30 on the frame 11. Also in the socket 29 is an elastic sleeve 31 with a hole for an axis 32, the ends of which are mounted in the two legs of a fork 34. However, Fig. 3 shows only one fork leg 33. The fork 34 has a rotatable threaded pin 35 which engages in an internal thread in one end portion of the clamping piece 36 is screwed, the other end part of which is fork-shaped with fork legs is, of which only one leg 37 is visible. The two fork legs are on both sides the support plate 22 and are on an axis 38 with

this rotatably connected. Section 13 is thus on

mounted pivotably with respect to horizontal movements in FIG.

According to the invention, the cuff 26 consists of a

more elastic material than the cuff 31, so that the

Vibration amplitude at the leading edge of the section

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can be greater than the vibration amplitude at the rear edge of the section. Since the vibration damper 17B is supported pivotably in the horizontal direction, the vibration damper 17A only dampens horizontal vibrations the rigid section 13, while the vibration damping with respect to vertical movements, a greater vertical amplitude at the front edge of the section 13 is allowed than at its rear edge. This is advantageous in that the Äsphaltmaterial on the front edge of the Section 13 has a looser structure than that of the rear edge. By appropriate dimensioning of the total length of the fork 35 and the clamping piece 36 is a optimal, uniform compaction of the asphalt material is guaranteed. Due to the horizontal vibrations of the Floor plate 21, the asphalt track is effectively smoothed flat.

4 shows the structure of the vibration drive 24 in more detail. A shaft 40 belonging to the drive extends over most of the total length of the associated smooth and compression section and is rotatably mounted in bearing blocks 41, 42 arranged on the profile body 23. The shaft 40 is not from one motor shown driven by a V-belt pulley 45, and carries an eccentric 43 and 44, respectively, in the vicinity of the two bearing blocks 41 and 42. Each The eccentric has a flange attached to the shaft 40

46 and linen flange 47. Between the two Flanges are two identical disks 48, 49 with in relation

^ relation to the center of gravity of the disc lying eccentrically Bores for the shaft 40 are provided. Each disc 48, 49 is provided with several through holes for through the flanges 47, 48 guided bolts 50, 51 formed so that the eccentric discs 48, 49 in the desired

° mutual angular position between the flanges 46 and

47 can be clamped. The angular rotation is through the The position of the through holes in the disks 48, 49 is specified. The effective eccentricity of the eccentrics 43, 44

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] can thus be changed, for example, according to the properties of the asphalt material to be laid. To change the eccentricity, the bolts 50, 51 are pulled out and the disks 48 , 49 are rotated in relation to one another until other holes in the disks are aligned with the through bores in the flanges 46, 47. The disks 48, 49 are then clamped again in the newly selected position with the aid of the bolts 50, 51.

Rotates shaft 40 in the direction of arrow P.

in Fig. 3, the entire section 13 is set in a vibrating, rotating movement, the amplitude of which is determined by the eccentricity of the eccentrics 43, 44 and by the action of the vibration damper. As already mentioned, the vibration movement at the front edge of the section 13 does not correspond to the vibration movement at the rear section edge, since the front section edge executes vertical movements, the amplitude of which is greater than that of the vertical movements at the rear section edge. This advantageous distribution of the vertical movement pattern is further increased by the fact that the shaft 40 is arranged so that its distance from the vibration ι 17A is smaller than the distance from the damper 17B.

The vibration movement described is a further improvement in the uniformity of the Asphalt track achievable, internally with regard to the movement pattern the front edge of the section 13 in connection with the concave scraper plate 20, that the asphalt material is not only conveyed to the outside of the section, but also circulated, so that the same pieces of asphalt material cannot accumulate in front of the scraping plate 20 and thus become cold.

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The constant circulation of the asphalt material ensures that it is compacted by the base plate 21 Material always has the same temperature, which makes the finished asphalt runway more even contributes. The transport of asphalt material in front of the scraping plate 20 can thereby be further improved be that the scraper plate is provided with several inclined guide plates, of which in Fig. 3 only two Guide plates 52 and 53 are visible. Fig. 3 shows that the guide plates from a point at the bottom End of the scraper plate 20 in the direction of the central plane M (Fig. 2) extend obliquely upward. The asphalt material is thus effectively fed to the outside of the lateral extension sections, that a lateral extension of the screw conveyor 4 shown in FIG. Over the machine width addition is not required.

The asphalt paver according to the invention offers apart from the advantages mentioned, also the advantage of an improved working environment for the operating personnel, because the vibration damping reduces the noise level. For those who are on the step the rear unit 5 is a clear control of the quality of the asphalt pavement The advantage that the footboard does not vibrate strongly, as is the case with the previously known machines.

9825 / 078S ORIGINAL INSPECTED

Claims (7)

Patent claims 1.1 Machine for laying asphalt pavements, with a vibrating smoothing and compacting unit, characterized in that the smoothing and compacting unit is divided into several sections, each of which for themselves about vibration-damping devices with the Machine are connected, and each of which is assigned separate vibration drives. 2. asphalt paver according to claim 1, characterized characterized in that each smoothing and compacting section in the production direction overhead with the machine Vibration damper is connected, which causes the vibration of the relevant section in a plane at right angles to the front edge, and that each section is connected to the rear of the machine via vibration dampers, which are less flexible than the first-mentioned vibration dampers for vibrations at right angles to the smooth and Compression level of the sections. 30th 3. Asphalt paver according to claim 2, characterized in that the front and rear of the same type of vibration damper are provided, one attached to the associated section parallel to its front edge Shaft through an elastic sleeve in one to the 90982R / 07 86 'OKlOlNM. 28536Q1 - ² - B 9367 ] Machine attached socket extends, and that the relevant shafts for the rear vibration damper via a spar that can be pivoted around the associated shaft are connected to the section. 4. asphalt paver according to claim 1,2 or 3, wherein the vibration drive comprises a rotating shaft provided with eccentric weights, which essentially parallel to the front and rear edge of the associated IQ section, characterized in that the distance between the front edge of the section and the shaft is smaller than the distance between the shaft and the rear Edge of the section. 5. asphalt paver according to claim 4, characterized in that the eccentric weights each consist of There are two blocks that have an eccentric hole for receiving the shaft and each with several Holes parallel to the bore are designed for receiving bolts, with which the blocks are in the desired position Angular position can be braced in relation to each other. 6. Asphalt paver according to claim 3 and 4, wherein a scraping plate for scraping off asphalt material is provided on the front edge of each section, characterized in that the scraper plate is concave is, and that the vibratory movement has such a direction that the section is in the machine direction moves when it is near its lowest vertical position. 7. asphalt paver according to claim 6, characterized in that the scraper plate with several inclined surfaces Leitplatfcen is provided, which of the associated 909825/0786 28536Q1 - 3 - B 9367 1 front section edge away to the next outer side are inclined towards the machine. 909 82 5/07