DE2362405A1 - VIBRATING ROLLER FOR SOIL COMPACTION - Google Patents

Description

DiPL-ING. HANS W. SCHDNi ^ G a « n _O7 4q7 *

PATENT ADVERTISER 2000 HAMBURG 1 ■ ^J · ^{υνί> J3} '*

Mönckebergstrasse 31

(at Rathausmarkt) Telephone (0411) 33 80 85

13 500 County Road 6
Minneapolis, Industrial Park-Minneapolis, Minnesota / USA Attorney's file: 3296

Vibrating roller for soil compaction

The invention "relates to machines for compacting fresh applied asphalt floor covering * soil or similar Materials. In particular, the invention relates to a soil compaction machine in which the desired compaction not only achieved by overflowing a heavy V-fold over the surface to be compacted, but also additionally by causing the roller to vibrate.

Such vibrating rollers are generally designed to be self-propelled. The vibrating roller consists of at least a roller running over the ground and, in most cases, two drive wheels. If the drive

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The actual roller is responsible for the feed generally arranged to be freely rotatable. On some soil compaction machines, the drive wheels are auoh replaced by a second roller, then one or but also both rollers can be provided with a drive can »As an example of execution of the invention, naoh-» following a soil compaction maeohine discussed »dl · is provided with a freely rotating roller and arwei drive wheels,

In the case of the vibration valse according to the invention, exactly as it is known from older machines, the oscillation * · movement of the drum with eccentric gauges generates the eobnell revolve around an axis, dl · sioh parallel to the Roller axis extends »During di · £ xeent # raaas # n sohnell the roller slowly rolls over the surface of the £ U compacting material. If you set the whales in motion, the result is, as is well known, an eehr fast and complete compaction. It is also known that the amplitude of the vibrations has a considerable influence on those with such a Bodenverdiobtungsmaschioe has caused the quality of work. Vibrations with large amplitudes quickly generate the usual · Sight · In dam material to be compacted, but leave the surface

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fluted or rough surtlok »vibrations with lower Amplitude, on the other hand, ensure extraordinarily smooth surfaces o With the previously known soil compaction «- maBobinen, however, the amplitude of the vibrations was constant, so the machine was either special for one Initially, or for a final one smoothing compaction were suitable. It is well known - and this applies to most known soil compaction »achinen eu - to make a compromise with regard to the vibration amplitudes, so that neither a fast strong compaction and a smoothing compaction could be sufficient.

The object of the present invention is to provide a Vibratlon whale, which has both an intense engagement as well as a smoothing laob compaction highest possible efficiency, well with the Vibrationswalse according to the invention, selectively vibrations can be ercougt with large or small amplitude.

In the above context, it is necessary to provide cheap and effective means of taxation. with which the operator controls the oscillation can change amplitude. This means inventions

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This causes the centrifugal force of the vibration generating eccentric mass itself with but changing the oscillation amplitude while the vibrating roller screen is in operation.

IHiroh such an inventive training is ee the Operator of such a floor engagement machine Possibly, shortly before the completion of an introductory rapid compression with high vibration amplitude, switch to a mode of operation with low vibration amplitude without stopping the hasofcine or the vibration-generating components of the machine. Here can also a fuse is provided which ensures that In Operation not by incorrect operation or automatically by compression with low vibration amplitude is switched to a compression with a high oscillation amplitude. That way it can be taken care of that an almost finished, smooth, compacted surface is not unintentionally destroyed again afterwards will.

A further feature of the invention is aimed at re-forming the Bodenverdlohtungsmaeohine so that the Operator both the frequencies and the amplitude

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the vibration; can adjust to βίο »fast adaptation to different Bodenverdίohtungarequire! aae to enable Ig this i ^? all laaaen eich Schwingunija »provide amplitude controls that allow a fast» turning of the vibration generating channels! impede.

In a floor seal according to the invention, the carrier is circulated around an ikcaenkeraohae., Which extends parallel to the v / alsenachoe and, in advance, coincides with the roll ache?, Uflamiaen ;, in circulation. wherein an eccentric aase ho is mounted on the carrier. since it circulates together with the girder uad sioh opposite the aem within defined limits radially beKüglloh the teracnse vers-fcellen. The centrifugal force generated by the outward movement of the movable eyelet aros a releasable lock "for example, a hydraulic system" * syliaäer, Bntg © geo ₃ which can also be mounted on the carrier circumferentially, by closing a manually operated control valve for the hydraulic cylinder Prevent an outflow of pressure medium from the cylinder, so that the movable sxzeatenaaase is prevented from a centrifugal movement which is slightly outside. This movable mass works a wide

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ÄcBentenaasee arranged diametrically opposite one another against, which is firmly connected to the carrier and tin Moment creates the greater let ale the greatest moment that can be exercised by the agile hatred «Thus one can reduce the oscillation amplitude by »that the aforementioned valve is opened so that the movable one Hate to move outside because of centrifugal force. Sin pressure-dependent locking device in the hydraulic circuit dee Hydraullfcaylindere -prevented an over-turning of the stimulating means.

Further details and features of the invention result from the following detailed description and the accompanying drawings, in which a precautionary Embodiment of the invention exemplified eats.

In the drawings «specially Jig. 1 is a front perspective view of a

Inventive soil compactionexaaeohine, 2 a longitudinal section through the vibrating roller of the soil compaction machine of

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make a rope section along the cutting line 3-3 of Figo 2 on an enlarged scale with the vibration generator set for high amplitude vibrations

Pig _o 4 a representation similar to Figo 3 with partially broken open and cut pressure generator with a setting for vibrations of low amplitude,

Fig, $ a schematic circuit diagram of the <slectro-

hydraulic control of the according to the invention Soil compacting machine to enable adjustment of the amplitude and the Frequency of vibrations and

6 shows a sectional partial view along the section line 6-6 of FIG.

The self-propelled soil compacting machine 5 according to FIG Invention includes a single freely rotatable twisting roller 6 and two motor-driven running wheels 7 »that are part of a tractor the Maeohine cares. When running over, that which is to be condensed Material can be steered the machine because the compaction roller arrangement is articulated with the tractor connected and provided with a vertical joint axle

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let Dae convenient for the Malchin operator accessible steering wheel θ enables the required steering, details of this steering and the adjustable Drive systems are conventionally designed and therefore not shown la individual.

Conventionally, the roller arrangement includes the Machine a rigid yoke whose arms 9 chamfer the whale and, like the jig. 2 εftigt, are provided with bearing mounting plates 10 via elastic abutment bearings 11 · Di · Bearing retaining plates 10 are located at the ends of the Vfale and wear the Äuftcren races of the bearings 12, over the the catfish freely dretfbar bit the bearing plates and over the sto-positioning 11 with dm amen 9 the yoke τ «* ~ are bound. The vibrations of the orphan thus do not digest transferred to the other ropes of the machine.

The Yardlohtungsvalea 6 is hollow. 2) 1 · Bohvingungaereeuger 13 are located within the Wals · and run among other things an Exeanteraohee us, the old of the whale sensen se susaasasnffall · Aua the following droning will still be It becomes clear that the present invention can also be applied to YibratlonBwaleen according to 33BP (German patent application P 20 02 763.8 of January 22, 1970). Bai

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These last-mentioned vibratory whales are provided with four terdiohtun whales, of which at least one is otorisob is driven, but the axes of the Sonvingungs « ereeuger above the rollers in parallel alignment lie under the roller axes.

In the case of the soil compaction shown here The inner race of each roller bearing 12 is located in a housing part, the axially outer wall 14 of a concentric housing 15. Tuck housing 15 are provided at both ends and each connected to the adjacent end wall 16 of the V / alee, each of these Housing 15 around the surface of the vibration absorber 13 according to the invention o Each of these Uehttu »· is with one Inner wall 18 is provided opposite the outer wall 14 axially inwardly offset is "The walls 14 and 18" In · * each Oehttusee wear the outer race · 19 for · XxzentertrSgsrwelle 20, which in this way «coaxially lur SranBelaohse is rotatably mounted. Each of these door waves 20 carries the ones described below Sxsenteraaseen, the catfish as they circumnavigate the Convey vibrations ο

On one of the üagernalteplatten 10 is a hydraulic motor

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attached, the old one of the Bxzentertröger waves 20 connected is »The rotary movement is transmitted to the other shaft 20 via a concentric hollow shaft 23

As shown in FIGS. 3 and 4, the eccentric mass, through the rotation of which around the shafts 20 vibrations are generated on the roller, consist of two elements which are carried by each of the shafts 20 25 Is attached to one side of the shaft and creates a substantially large eccentric moment. The other Haeaenelement 26 Utnfts together with the shaft 20 and is located on the U9T from the fixed Haeaenelement 25 remote side. The Maasenelement 26 is mounted so that it can be adjusted radially on the shaft 20 between a position of high amplitude in the hub of the eccentric aobae (Figure 3) and a position of low amplitude (flg. 4) the radial relative movement is limited by AnsohlKge. Even if the agile mase elexoent 26 rests on its outer en Greoeaneohlaf _f its Ezeentermoaent is even less than the Exaeutarmoment the "fixed Haasenelement 25" which is thus sosusagsn always oppositely larger than the movable one

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Mass element 26 ", As a result, the centrifugal force caused outward movement of the movable mass element 26 generated by the two Hasse elements Moments of marriage are set closer, so that calibrated the vibration amplitude generated by the boom compaction machine is reduced.

In the special embodiment shown here, the fixed mass element is essentially U-shaped, the yoke part being designed as a hub 27 which closely surrounds the shaft 20 and is non-rotatably connected to it by means of 7erachweiaeungen 28. The massive legs 29 of the U-shaped mass element lie at equal distances on opposite sides of a plane which contains the eccentric axis and extend one side of the shaft _; to generate the larger bxeentering moment. From the Jooh part of the larger Maaeeeleaentes extend in the opposite direction to the aforementioned mass element legs two parallel ftth «rungeatangen 50 on which the smaller Haeeeeltmente 26 are supported relative to the shaft · Fixed elements a. The radially outermost one

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Position of the small measuring elements is defined by the enlarged heads 31 at the outer ends of the guide rods 30,

When the vibration generator is in operation , the outward movement of the smaller mass elements 26 caused by centrifugal force can be prevented in order to maintain the large vibration amplitude,

one This can be done through the releasable lock is shown here as a unilaterally acting hydraulic cylinder 32 »The actual cylinder 33 is between the Legs 29 of the solid mass element mounted. the associated piston rod 34 of piston 35 let shift * borrowed through a bore 35 'of the shaft 20 (Pig »6) and runs parallel between the guide rods 30« The outer end part of the piston rod is with a nut 36 of the movable Ifeeaeelementee, by dta the piston rod is also fixed.

For the hydraulic control on which the rod-side End of each hydraulic cylinder 33 is connected, contains how the Pig. 5 shows an accumulator 37 and a control valve 38, the hydraulic circuit is essentially an enclosed system with which in series

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did cylinders 33 at one end ", the accumulator 37 em the other end and a control valve 38 with which the fluid communication between the cylinders and the Accumulator can be produced «The control valve can be operated manually directly * Preferably However, if it is about a common, normally open, solenoid valve! the slab aue in the distance with one Amplitude selection switch can be operated, which is arranged on the driver's control panel, which is not shown.

When the valve 38 is closed, the pressure medium is shut off at the end of the cylinder. If the movable Kaase-elements are in positions corresponding to a high amplitude, centrifugal force cannot cause any outward movement if the amplitude selector is operated in the holding position for a large amplitude, the solenoid valve 38 is energized and the valve is closed. If dagtgen the Amplltudenwahlsohelter iat set into position for small amplitudes, the solenoid valve is de-energized and the valve is opened "So this control valve let only shut off when the Amplltuäemmnlsohalter is in its position for large amplitudes · If the vibration generator in operation and the valve 38 ge

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-H-

opens lat _r , the centrifugal forces on the movable dimensions cause the pressure medium to be pressed out of the cylinders and flow into the accumulator. The vorbandene in Aldcumulato ^ compressed air, which "was under considerable pressure, iet nioht large enough iu prevent this caused by centrifugal motion, Eb to note here is that disturbances in the hydraulic or errors in the operation of the Ventilee 38 only can lead to »that vibrations with a low amplitude arise.

Like the Pig. 5 shows, the hydraulic circuit can also contain a pressure gauge 39 and a filling valve 40 which can be operated manually. The pressure sea can be detachably connected to the pressure medium inlet of the filling valve β.

The accumulator 37 and dae amplitudes are control valve 38 calibrated veretändlioherwelee is of solid components machine, whereas the cylinder 33 eueaamen old represents BxsentertrSgerwelle circulate · The Druckmittelanecblüeee for the cylinders are formed of cables of each support shaft and rotary couplings 42 · are calibrated SWEi in each wave ixlalbohrungen 43, which form flow center channel parts and at the outer ends of the shaft

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end / but only lead to just before the middle part of the shaft through which the piston rod of the hydraulic cylinder passes. The inner end of each bore is connected to the rod end of the adjacent cylinder 33 via a conduit 44 so that the two bores of each shaft are connected via the cylinder. The mouths of the bores at the axially inner ends of the shafts are connected to one another via a high-pressure hose 45 which is located inside the hollow shaft 23. The rotary coupling 42 is arranged at the end of the roller which is opposite the hydraulic motor 22. The stationary components of the rotary coupling are located in the adjacent bearing holder plate 10 _o From there a line 46 leads to the valve 38.

The stator of the hydraulic motor 22 is fastened in the adjacent bearing holder plate 10. The drive connection between the Kotor of the hydraulic motor 22 and the adjacent one Eccentric support shaft 20 consists of a cross bolt 47t the one trained by the diminished suroh knife End portion 49 of the shaft passes. The adjacent axial bore 43 * in the shaft runs eccentrically parallel to the axis and ends at a shoulder surface of the shaft end 49 *, which has a reduced diameter, here

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let the bore 43 'be sealed with a plug 50, Open the hydraulic systems for ventilation can.

5, the hydraulic motor 22 receives its pressure medium from a pump 52 depending on the control operations of the operator. For the sake of simplicity, the control with which the operator operates the hydraulic motor is shown as a four-way solenoid valve 53. The valve above of the valve 53 is held in the centralized position so that, if it is not moved, it assumes a neutral position in which the pump is separated from the motor. The 3t your β oh ieber is electromagnetically displaceable in ewei Arbeitsatellungen in which optionally the motor in one direction or the other is driven "J ¹ Ur the Pachmann 1st it obvious that it is here at the engine controller to one at eioh known arrangement acts in a closed circuit, ie motor and pump · are connected in a closed circuit, whereby the output of the pump can be changed using an auxiliary valve.

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2382405

Torzugewelse is the Drebrichtuag dee Motors 22 with the direction of the machine is coordinated so that the Horizontal component of the force caused by the vibration generators nloht counteracts the movement of the machine. Bs "there is therefore the possibility; a single one Provide control device with which the operator influenced both the direction of rotation of the machine and the direction of rotation of the motor 22

Manual control means can be provided for the operator to control a desired oscillation frequency j with this frequency understandably the speed of the motor 22 corresponds to »The control can with the animal way valve 5? (Or if, instead of the arrangement shown, a closed-loop control system Circuit is used with an auxiliary valve) to make the animal way valve 53 wholly or partially in one of the Moving working positions »PUr the frequency control a speed sensor 54 is attached to the side wall 10 remote from the hydraulic motor 22, which is connected to a Jagged wheel pulse generator 55 cooperates with the adjacent Ezaenterträgerwelle 20 connected let and with this rotates · The speed sensor 54 1st Im essentially a tachometer that detects electrical impulses

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testifies »whose frequency depends on the Vfellendrehssahl. It will be apparent to those skilled in the art that the operator can adjust the vibration frequency by having them the Torah probes generated impulses with brings a reference pulse train for comparison, then the electromagnetic four-way valve corresponding to the Result of the pulse train comparison is activated »Devices for the generation of reference ira pulse sequences and for implementation dee comparison and also to generate corresponding Exit forces are generally known.

If the frequency control should fail for any reason, control parts respond in the machine according to the invention. Prevent the excessively high vibration frequency from lancing. _{A normally closed 9} pressure-dependent operating switch 56 »which is hydraulically connected to the amplitude control and acts on the cylinder 32 and the accumulator 37, which acts on one side, belongs to these control parts. It is obvious that when the speed of the hydraulic motor 22 increases, the force SU acting on the movable mass elements 26 leads to an increase in the pressure in the connection control system. The pressure-dependent working Sohalter 56 is set so that it opens as soon as the pressure in the

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hydraulic system exceeds a critical value. This critical value is chosen so that it is slightly higher than the highest oscillation frequency to which the Machine is adjustable. By opening the pressure-dependent working switch, the excitation circuit for the electromagnets of the animal way valve is interrupted, so that the control slide is brought into the middle position and then prevents pressure medium from the pump 52 is supplied to the engine 22. The pressure-dependent switch 56 is thus a safety device for a Overturning the vibration generator.

From the foregoing description and the accompanying drawings it will be seen that the invention discloses a vibrator for a soil digester in which both the amplitude and the frequency of the vibration can be selected by the operator of the machine can switch from vibrations with high amplitude to work with low sohwing amplitude while the machine is in operation, but that an opposite switching process is not possible, so that the machine becomes foolproof, well any abuse of the amplitude control or any malfunction on the machine at most lead to vibrations with a low amplitude "

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Claims (1)

2382405 - 20 - claims l.J Vibration roller for soil compaction with vibration generation by rotating axially parallel to the roller axis Eccentric masses characterized in that the the Eccentric »ssen (25 * 26) supporting driven shaft (20) with first mass elements (25) fixedly attached to the shaft in a predetermined radial direction Alignment and is additionally provided with oppositely aligned second mass elements, whose position can be changed in the radial direction. 2. vibrating catfish according to claim 1, characterized in that that the first mass elements (25) are designed so large that the moment they generate is greater than the maximum torque that can be generated by the radially movable mass elements (26). 5. Vibrationswalae according to claim 1 and 2 thereby marked that the the Exzenteraaseen (25 »26) supporting shaft (20) is arranged coaxially to the roller axis. 4 · Vibrating roller according to claim 1 bie ^ characterized in that the radially movable Maeeenelenente (26) mounted on guide rods (30) arranged on both sides of the shaft (20) carrying them «Iod. 509825/0180 2382405 5. Vibrating roller according to claim 1 to 4, characterized in that the fixed MaesenAlemente (25) Are U-shaped and »wipe their legs (29) receive a pressure medium cylinder (33), its Piston rod (34) through one of the mass elements (25, 26) supporting shaft (20) traversing bores (35) passed through and with the middle part of the associated movable mass element (26) is connected. 6. Vibrationswalse naoh claim 5, characterized in that that the printing press cylinder is one-sided with respect to the shaft (20) carrying the mass elements is an inwardly acting hydraulic cylinder 7. vibrating roller according to Anspruoh 5 and 6 thereby characterized in that the hydraulic cylinder (33) is in a closed hydraulic circuit (Jig. 5) lie, the one resilient hydraulic accumulator (27) and one from the operator pereon can be operated by the vibratory roller. Shut-off valve (38) contains « 3. Vibrating roller according to claim 7, characterized in that the pressure in the hydraulic accumulator (37) is set in such a way that it can hold the movable outer mass elements (26) in their limit position, vena the (25 »26) do not rotate, and that this pressure but 509825/0 180 It is insufficient if the mass elements (25, 26) rotate above a previously determined speed so that the movable mass elements ( 2 &) can move outwards under the influence of the centrifugal force. 9. Vibrationswalsse according to claim 1 to 8, characterized in that the eccentric mass shaft (20) is driven by a variable-speed reversible motor, in particular a hydraulic motor (22) . / c? .Vibration roller according to claim 9, characterized in that that a pressure-dependent switch is provided in the closed hydraulic circuit, which when a predetermined pressure caused by Zentrifugajfemi ¹ * responds to switch off the drive motor (22) of the eccentric mass shaft (20). // «Vibrating roller according to claim 9 and 10, characterized in that the drive motor (22) is provided with a speed sensor (54,55) which over :? a coupling circuit keeps the engine speed constant at a set value. 509825/0180 , * ³ ♦ Blank page