EP1212148A1 - Schwingungserreger für bodenverdichtungsgeräte - Google Patents
Schwingungserreger für bodenverdichtungsgeräteInfo
- Publication number
- EP1212148A1 EP1212148A1 EP00965951A EP00965951A EP1212148A1 EP 1212148 A1 EP1212148 A1 EP 1212148A1 EP 00965951 A EP00965951 A EP 00965951A EP 00965951 A EP00965951 A EP 00965951A EP 1212148 A1 EP1212148 A1 EP 1212148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phase position
- phase
- centrifugal
- vibration plate
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
- B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
- B06B1/166—Where the phase-angle of masses mounted on counter-rotating shafts can be varied, e.g. variation of the vibration phase
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/074—Vibrating apparatus operating with systems involving rotary unbalanced masses
Definitions
- the invention relates to a vibration exciter, which is used in particular in soil compaction equipment.
- Soil compaction devices in particular vibration or vibrating plates, have a ground contact plate which is movable above the ground to be compacted and which is acted upon by a vibration generated by a vibration exciter.
- the shaking movement caused by this causes the soil particles to move and shift each other, thereby closing gaps and achieving the desired soil compaction.
- phase position between the centrifugal weights or unbalanced shafts can be adjusted, as a result of which the alignment of the resulting vibration or the resulting force can be adapted to the operator's wishes.
- one of the unbalanced shafts can be rotated relative to a gear which meshes with a gear of the other unbalanced shaft and generally ensures a fixed coupling of the rotary movement.
- vibration exciters are described in DE 36 09 360 and in DE 35 45 593 C2.
- FIG. 5 shows a schematic side view of a vibration exciter known from DE 29 09 204 C2.
- Two parallel unbalanced shafts 1, 2 are driven in opposite directions and at the same speed as indicated by arrows A and B.
- Each of the unbalanced shafts 1, 2 carries a centrifugal weight 3, 4, which results in the centrifugal forces 5 and 6 shown by arrows.
- all other drawings do not repeat the reference symbols. It is always the same arrangement, but in different positions.
- Fig. 5a shows the known vibration exciter, in which the phase position by a phase adjustment device, not shown, for. B. by the relative to one of the unbalanced shafts 1, 2 rotatable gear is set so that the centrifugal forces 5, 6 extend obliquely in one direction, that is, with a vertical and a forward horizontal component.
- a force diagram is also shown in FIG. 5a.
- FIG. 6 The exact course of a 180 ° rotation of the unbalanced shafts 1, 2 with the centrifugal forces 5, 6 is shown in FIG. 6 in 45 ° steps.
- the vertical component relieves the load on the ground contact plate or even lifts it partially above the ground, while the horizontal component ensures the desired propulsion.
- FIG. 5b shows the vibration exciter with changed phase position.
- the unbalanced shaft 2 or the centrifugal weight 4 was rotated relative to the unbalanced shaft 1 with the centrifugal weight 3 by an angle of 90 ° in order to achieve the phase position shown in FIG. 5b).
- 7 shows a 180 ° cycle in 45 ° steps. From this it can be seen that in the phase position shown in FIGS. 5 b) and 7 no resulting horizontal forces occur, while the vertical forces add up to a maximum. In this phase position, the vibrating plate remains in place and causes maximum compaction of the soil due to maximum vertical vibration.
- Fig. 5c shows the phase position of the unbalanced shafts 1, 2 for the backward movement of the vibrating plate (to the right in the figure). It is common to all vibration exciters known from the prior art that the resulting centrifugal force vector is directed vertically in the so-called reversal point, ie in the phase position in which the vibrating plate is in place (FIG. 5b). The force acting on the soil to be compacted is therefore greatest in this position and decreases when the plate moves forwards or backwards and the associated pivoting of the resulting force vector by, for example, 45 ° forwards or backwards to 1 / V2 of the maximum value.
- Vibrating plates with vibration exciters of this type which are to be used for asphalt or composite stone compaction, prove to be problematic. If the maximum vertical force acts here at the reversing point, punctual settlements can occur that can no longer be corrected. With asphalt rollers, the vibration is therefore usually switched off in the reversing area in order to prevent the roller from penetrating too deeply into the asphalt when the direction is reversed.
- the invention has for its object to provide a vibration exciter for soil compaction equipment, in which a strong impact on certain soils, such as asphalt or composite stone can be avoided when reversing or when the machine is at a standstill.
- a vibration exciter according to the invention for soil compaction devices has unbalanced shafts which are parallel or coaxial to one another and can be driven in opposite directions at the same speed and each carry at least one centrifugal weight. It is a special feature of the invention that the phase position of the centrifugal weights can be adjusted by a phase adjustment device in such a way that the vertical components of the centrifugal forces generated by the centrifugal weights cancel each other out. According to the invention, it is thus possible to set a phase position in which the vertical components of the centrifugal weights cancel each other out, so that the force resulting from the centrifugal forces has no vertical component and no vertical vibration acts on the surface to be compacted. Despite continuous operation of the vibration exciter and thus rotation of the centrifugal forces, further compaction of the subsoil can be avoided.
- a particularly advantageous embodiment of the invention is characterized in that the horizontal components of the centrifugal forces add up in the same direction in this phase position.
- the resulting force vector thus has a maximum horizontal component. This makes it possible to have a high shear stress z. B. in the asphalt surface to smooth minor cracks or pores. Since the resulting horizontal forces are generated in one direction and in the other (forward and backward) during a 360 ° rotation of the centrifugal weights, the soil compacting device practically does not move.
- a further, particularly advantageous embodiment of the invention is characterized in that, in order to effect a movement of the soil compaction device in a first direction, the phase position defined for the standstill can be adjusted by a positive angle, while in order to bring about a movement in a direction opposite to the first Direction the phase position is adjustable by a negative angle. It is thus possible to take advantage of the advantages already present in the vibration exciters known from the prior art for driving the soil compacting devices forward and backward.
- phase position defined according to the invention for the stationary or reversing point can be temporarily assumed when changing between forward and reverse travel, ie a change between the first and second directions. If the operator then changes between driving forwards and backwards, the vertical vibrations automatically decrease to zero at the reversing point, so that the operator does not have to take any further precautions to protect the ground to be compacted.
- An advantageous further development of the invention is that the phase position can be adjusted in such a way that the horizontal components of the centrifugal forces cancel each other and the vertical components add up in the same direction.
- a phase position can also be set which affords the advantages of the vibration exciters already known from the prior art, in particular a maximum compaction performance when the machine is at a standstill.
- phase adjustment device has at least one device for rotating one of the flyweights relative to an associated other flyweight in superposition to the opposite rotation of the unbalanced shafts.
- the phase adjustment device the structure and mode of operation of which is known in principle from the prior art publications cited above, can thus be combined from several units in order to satisfy the versatile adjustment options for the phase position provided according to the invention.
- FIG. 1 shows a schematic side view of a vibration exciter according to the invention in different phase positions
- vibration exciters in various forms are known.
- phase adjustment devices e.g. B. from the cited prior art documents - known, through which the phase position of the flyweights carried by the unbalanced shafts can be changed. Since the invention does not relate to the detailed and specific design of a specific vibration exciter or a specific phase setting device, but rather to a phase position that is particularly suitable for this but not yet known, a description of a specific embodiment is not necessary.
- phase adjustment device must be suitable for adjusting the relative position of the flyweights on the unbalanced shafts by superimposing the coupled, counter-rotating movement.
- the unbalanced shafts are coupled by meshing gears, the position of a gear relative to the associated unbalanced shaft can be changed, which also changes the phase position of the flyweights.
- This principle has proven itself extremely well in practice and - as already explained - e.g. B. described in DE 29 09 204 C2, which in turn refers to further prior art, in which the present invention can be applied.
- the vibration exciter In the vibration exciter, it can z. B. are an exciter with two parallel shafts, each carrying a flyweight, the flyweights of the two unbalanced shafts being arranged opposite one another. Such a vibration exciter is also known from DE 29 09 204 C2.
- vibration exciter In another, e.g. B. from DE 30 43 719 C2 known vibration exciter carries each of the unbalanced shafts two flyweights, which are offset coaxially. In yet another vibration exciter, it is possible to change the position of the centrifugal weights arranged coaxially on an unbalanced shaft, for example in order to bring about a steering movement of the vibrating plate.
- Fig. 1 shows an overview of the phase positions provided according to the invention, with Fig. La) a forward movement of the vibrating plate (in the Fig. To the left), Fig. Lb) a phase position in the stand or reversing point and Fig. Lc) the phase position for Backward movement of the vibrating plate affects.
- FIGS. 1b) and 2 relate to the phase position in which the vibrating plate is in place.
- the unbalanced shafts 1, 2 with the centrifugal weights 3, 4 are positioned so that the centrifugal forces 5, 6 lie in the horizontal direction and add up to a maximum value.
- the vibrating plate does not lift off the floor and does not introduce vertical vibrations into the floor. Rather, the vibrating plate is alternately pulled forward and backward without significantly changing its position, so that shear forces act on the ground and, for example, on asphalt. B. can close pores or cracks.
- Fig. 3 shows the change in the phase position when switching from the reversing point to the forward position.
- phase 3a takes up the phase position shown in FIG. 1b) for the reversing position.
- the phase position is then changed by means of the phase adjustment device, not shown, in such a way that the unbalanced shaft 2 with the flyweight 4 is rotated relative to the unbalanced shaft 1 with the flyweight 3 by an angle of -90 ° (according to the mathematical sense of rotation). It should be pointed out that this rotation takes place in addition to the permanent, coupled, counter-rotating rotation, that is to say it is superimposed.
- the switchover from the reversing position (FIG. 4a) to the reverse travel (FIG. 4b)) is also shown in FIG. 4.
- the phase position is changed such that the second unbalanced shaft 2 is adjusted by an angle of + 90 ° with respect to the first unbalanced shaft 1.
- the rotation is superimposed by the phase adjustment device on the permanently coupled counter-rotation, so that the position shown in Fig. 4c) can be achieved.
- phase positions mentioned can be set.
- the devices required for this are known in principle, but have not been used in the manner according to the invention.
- the phase adjustment device usually consists of a single unit which enables the desired adjustment of the phase position.
- phase adjustment device when the phase adjustment device is not actuated, the phase position remains constant over the entire rotation of the unbalanced shafts.
- La), lb) and lc) therefore show three different phase positions, while FIG. 2 shows only one phase position in representations a) to e), but in different rotational positions.
- the invention makes it possible for the unbalances in the reversing point to produce only a resultant horizontal force vector which decreases with increasing running speed and with changing the phase position and thereby pivoting of the force vector, for example to a value from 45 ° to the front or back reaches the value 1 / A / 2 • C for the horizontal (VH) and vertical (W) component, where C corresponds to the maximum achievable force value.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Road Paving Machines (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19943391A DE19943391A1 (de) | 1999-09-10 | 1999-09-10 | Schwingungserreger für Bodenverdichtungsgeräte |
DE19943391 | 1999-09-10 | ||
PCT/EP2000/008806 WO2001019535A1 (de) | 1999-09-10 | 2000-09-08 | Schwingungserreger für bodenverdichtungsgeräte |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1212148A1 true EP1212148A1 (de) | 2002-06-12 |
EP1212148B1 EP1212148B1 (de) | 2004-07-21 |
Family
ID=7921542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00965951A Revoked EP1212148B1 (de) | 1999-09-10 | 2000-09-08 | Schwingungserreger für bodenverdichtungsgeräte |
Country Status (5)
Country | Link |
---|---|
US (1) | US6655871B1 (de) |
EP (1) | EP1212148B1 (de) |
JP (1) | JP2003509192A (de) |
DE (2) | DE19943391A1 (de) |
WO (1) | WO2001019535A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10306791A1 (de) * | 2003-02-18 | 2004-08-26 | Bomag Gmbh | Schwingungserregervorrichtung |
DE102005029432A1 (de) * | 2005-06-24 | 2006-12-28 | Wacker Construction Equipment Ag | Bodenverdichtungsvorrichtung mit automatischer oder bedienerintuitiver Verstellung des Vorschubvektors |
US7938595B2 (en) * | 2007-04-30 | 2011-05-10 | Caterpillar Paving Products Inc. | Surface compactor and method of operating a surface compactor |
DE102013021494B4 (de) | 2012-12-28 | 2023-11-30 | Bomag Gmbh | Vibrationsplatte mit einem Schwingungserreger |
DE102017000193A1 (de) * | 2017-01-11 | 2018-07-12 | Bomag Gmbh | Walze zur Bodenverdichtung sowie Verfahren zum Erzeugen eines Schwingungsbildes einer Walze zur Bodenverdichtung |
DE102022109299A1 (de) | 2022-04-14 | 2023-10-19 | Wacker Neuson Produktion GmbH & Co. KG | Unwuchterreger für Bodenverdichtungsvorrichtungen |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3736066A (en) | 1971-03-15 | 1973-05-29 | Pettibone Corp | Vibratory earth compacting apparatus |
US3878733A (en) * | 1974-01-15 | 1975-04-22 | Stone Construction Equipment | Compactor with directional control for eccentric weights |
DE2909204C2 (de) * | 1979-03-09 | 1982-08-19 | Wacker-Werke Gmbh & Co Kg, 8077 Reichertshofen | Schwingungserreger mit zwei Unwuchten |
US4398431A (en) * | 1979-04-09 | 1983-08-16 | Melnick Harry S | Mechanical power transmitting system |
US4499779A (en) * | 1982-06-07 | 1985-02-19 | M-B-W Inc. | Vibratory compactor |
DE3545593C2 (de) * | 1985-12-21 | 1994-05-05 | Ammann Duomat Verdichtung | Vibrationsplatte zur Verdichtung des Bodens |
DE3609360A1 (de) * | 1986-03-20 | 1987-09-24 | Ammann Duomat Verdichtung | Vibrationsplatte zur verdichtung des bodens |
JPH0444506A (ja) * | 1990-06-11 | 1992-02-14 | Mikasa Sangyo Kk | 振動締固め機の起振装置 |
DE19529115A1 (de) * | 1995-08-08 | 1997-03-06 | Wacker Werke Kg | Vibrationsmechanismus, insbesondere zur Verwendung zur Verdichtung von Böden |
DE19629324C1 (de) * | 1996-07-20 | 1997-10-16 | Wacker Werke Kg | Vibrationsplatte mit Besohlung |
US5825663A (en) | 1996-11-04 | 1998-10-20 | Gec-Marconi Aerospace Inc. | Vibration control system |
-
1999
- 1999-09-10 DE DE19943391A patent/DE19943391A1/de not_active Ceased
-
2000
- 2000-09-08 JP JP2001523150A patent/JP2003509192A/ja active Pending
- 2000-09-08 EP EP00965951A patent/EP1212148B1/de not_active Revoked
- 2000-09-08 WO PCT/EP2000/008806 patent/WO2001019535A1/de not_active Application Discontinuation
- 2000-09-08 DE DE50007146T patent/DE50007146D1/de not_active Revoked
- 2000-09-08 US US10/070,891 patent/US6655871B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0119535A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001019535A1 (de) | 2001-03-22 |
DE19943391A1 (de) | 2001-04-12 |
DE50007146D1 (de) | 2004-08-26 |
JP2003509192A (ja) | 2003-03-11 |
EP1212148B1 (de) | 2004-07-21 |
US6655871B1 (en) | 2003-12-02 |
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