EP2583000A1

EP2583000A1 - Vibrating plate with v-belt stabilizing means

Info

Publication number: EP2583000A1
Application number: EP11723875.8A
Authority: EP
Inventors: Hermann Schennach; Bernhard Spies
Original assignee: Wacker Neuson Produktion GmbH and Co KG
Current assignee: Wacker Neuson Produktion GmbH and Co KG
Priority date: 2010-06-18
Filing date: 2011-05-20
Publication date: 2013-04-24
Anticipated expiration: 2031-05-20
Also published as: DE202010009261U1; WO2011157344A1; EP2583000B1

Abstract

A vibrating plate for ground compacting has an upper mass (O) with a drive motor (7) and a lower mass (U) with a ground contact plate (1) and with a vibration generator device (2, 3, 4). The drive motor (7) drives a driving pulley (8) in rotation, such that the rotational movement is transmitted via a belt (9) to a driven pulley (10) coupled to the vibration generator device. A limitation device (B1, B2, B3, B4, B5, B6) is provided which is arranged laterally on the belt (9) in a region in which the belt (9) is not in contact with the driving pulley (8) or the driven pulley (10). The limitation device has a contact region on a side facing towards the outer surface and/or inner surface of the belt (9).

Description

Vibration plate with V-belt calming

The invention relates to a vibrating plate for soil compaction.

Predominantly smaller vibrating or vibrating plates have an upper mass with a drive motor, which drives a belt drive mounted on a bottom contact plate vibration excitation device, which may have, for example, one or more belonging to a lower mass unbalance shafts. By the vibration excitation device, for example by rotation of the unbalanced shafts, vibrations are generated, which act in the soil to be compacted. The upper mass and the lower mass are movable relative to each other by spring elements arranged between them.

Larger vibratory plates use a hydraulic drive instead of a belt drive for the vibration exciter drive. However, the invention is concerned with vibrating plates, in which the drive energy is transmitted via a belt drive on the vibration exciter.

The belt drive usually has a V-belt which extends between a driving disk driven by the drive motor and a driven disk coupled to one of the imbalance shafts. In addition, a centrifugal clutch can be arranged between the drive motor and the drive disk so that torque is transmitted from the drive motor to the V-belt only when a predefined engagement speed is exceeded. The driven pulley usually transmits the torque of the drive motor directly to the vibration excitation device, such as, for example, a shaft end of the imbalance shaft to which the driven pulley is mounted.

During operation of such a vibrating plate, strong vibration movements of the ground contact plate and thus of the entire lower mass occur as desired. Due to the inherent relative mobility between the lower mass and the upper mass, however, the center distance between the drive pulley belonging to the upper mass and the driven pulley belonging to the lower mass and subject to the lower mass is subject to permanent fluctuations in the range of a few millimeters. As a result of this, the V-belts used during normal operation of such a vibration plate achieve a considerably shorter service life than would be the case with a fixed axle distance application. The reason for this is that V-belts are generally designed for use with a constant center distance. When used in a vibration plate, however, the V-belt is exposed by the forces generated by the vibration excitation strong fluctuating, jerky tensile loads. Furthermore, the V-belt is subject to constantly changing rotational speeds of the driven pulley, which are due to the exchange of kinetic energy between the lower mass, the vibration generating device and a machined soil. As a result, the V-belt experiences high abrasive wear on its side flanks. Furthermore, the V-belt performs whip-like movements that cause a curvature of the V-belt towards the back of the belt. For such curvatures, however, the V-belt is not designed so that it can tear in the sequence by overstretching the flank sides or the inside.

The significant reduction in the service life of a V-belt used in a vibrating plate can entail undesirably high costs, in particular when the V-belt breaks during use of the machine, by delaying the working process and the subsequent construction site processes.

The invention has for its object to provide a vibrating plate with a belt drive, in which the life of a belt used to transmit the drive energy can be increased.

According to the invention the object is achieved by a vibration plate according to protection claim 1. Advantageous developments are specified in the dependent claims.

A vibrating plate for soil compaction has an upper mass and an upper mass resiliently movably mounted lower mass. The lower mass has a soil contact plate for processing a soil to be compacted. The ground contact plate is set into a vibrating working movement by means of a vibration exciter coupled to it. The vibration exciter device is driven by a drive motor, which is arranged on the upper mass. Furthermore, a belt drive device (also referred to below as a belt drive) is provided with a drive disk which can be driven by the drive motor and an output disk coupled to the vibration exciter device. The drive energy of the drive motor is transferable from a belt, such as a V-belt, from the drive pulley to the driven pulley. Also, the use of different belt, such as V-ribbed belts, toothed belts or flat belts, for energy transfer is possible.

Furthermore, at least one limiting device is provided, which is arranged laterally next to an outer and / or inner surface of the belt in a region in which the belt is not in contact with the drive or driven pulley. In other words, the restraining means is disposed outside and / or inside the belt driving means adjacent to an outer surface of the belt in a region where the belt is guided between the driving pulley and the driven pulley freely and without contact therewith.

Furthermore, the limiting device has a contact region on a side facing the outer and / or inner surface of the belt.

It can one or more limiting devices -. B. also in the form of one or more limiting elements - be provided on the outer and / or on the inner surface of the belt. The limiting device can have one or more contact areas at which the belt can be guided when required.

In an operation of the vibration plate for Bodenverrichtung a torque of the drive motor can be transmitted, for example via a shaft to the drive pulley of the belt drive device. The drive torque can be transmitted via the belt to the driven pulley and via the driven pulley to the vibration exciter device. For example, the vibration exciter device may have an imbalance shaft with an eccentrically mounted imbalance mass which is coupled to the driven pulley. In this embodiment, the imbalance shaft is set in rotation by the drive torque transmitted by the driven pulley. As a result, the lower mass coupled to the vibration exciter device and the ground contact plate connected thereto can be put into a vibrating working movement. The necessary relative mobility of the lower mass relative to the upper mass can be achieved by a resilient coupling of the lower mass to the upper mass by means of spring elements.

Due to the resilient relative movement between the lower mass and the upper mass, the axial distance between the drive pulley and the driven pulley changes. This allows the belt to vibrate or whip like a whip. offset, which, as already shown, on the one hand can affect the stability and thus the life of the belt and on the other hand, the transmission of the drive torque adversely. Such oscillations and whip-like movements can be mechanically limited or even largely prevented by the laterally adjacent to the outer and / or inner surface of the belt limiting device, since a deflection of the belt over the contact region of the limiting device hinau s in operation is not possible. As a result, the running smoothness of the belt is significantly improved, whereby the life of the belt is increased and the transmission of the driving torque to the vibrator is improved.

In one embodiment, the contact area perpendicular to a running direction of the belt is bounded by a rounded edge. By way of example, the contact region may have a rounded inlet edge and / or a rounded outlet edge which delimits the contact region in a direction in which the belt enters or leaves the contact region in accordance with its direction of movement. As a result, damage to the belt can be largely avoided at a contact or at an impact of the belt at the contact surface.

In one embodiment, the contact region has a width that corresponds to at least one width of the outer and / or inner surface of the belt. In particular, a contact region facing the outer surface of the belt has at least one width corresponding to the width of the outer surface of the belt and a contact region facing the inner surface of the belt has at least one width corresponding to the width of the inner surface of the belt. In this way, it can be achieved that upon impact of the belt in the contact region of the belt completely, so along its entire width, comes into contact with the contact area. As a result, damage to the belt when hitting the contact area can be additionally prevented. If vibrations of the belt are also to be expected in the direction of its width, the contact area can additionally be widened in order to ensure complete striking or touching of the belt with its entire width in the contact area even with such a swinging of the belt.

In a further embodiment, the contact area along a longitudinal side of the outer or inner surface of the belt can be characterized by rounded edges. be limited. As a result, damage to the belt at an impact in the contact area can be further avoided.

In a further embodiment, the limiting device may have a substantially cylindrical contact surface. The design of the contact surface in the form of a cylindrical surface with, for example circular or elliptical, the base side of a corresponding cylinder corresponding cut causes a uniform distribution of the movement of the belt opposing forces on the belt, so that possible damage to the belt further avoided when striking the belt become.

In a further embodiment, the limiting device may have a contact surface formed by bending a metal part. By bending the metal part, a contact area can be achieved which largely prevents damage to the belt upon impact of the belt. Furthermore, the bending allows a simple and inexpensive construction of the limiting device.

In a further embodiment, the limiting device may have a curved U-profile. In this way, a simultaneous limitation of the vibrations and the whipping movements of the belt on the inside and outside can be achieved by an integral component. For example, the U-profile can be arranged in the region of the belt drive such that the belt is guided between the legs of the U-profile during operation of the belt drive. The legs of the U-profile can be arranged in this arrangement, inside and outside of the belt drive and thereby opposite to an inner or outer side of the belt. A connecting arch of the U-profile may be attached to the upper or lower mass of the vibrating plate. With this arrangement, vibration or whip-like movement of the belt can be effectively limited inwardly by the inner leg and outwardly by the outer legs of the U-profile. The U-profile can be formed inexpensively, for example, by bending a metal part. In a further embodiment, the limiting device is arranged at a predetermined distance to the outer surface of the belt in a rest state of the belt, in which the drive and the driven pulley stand still. For example, the arrangement of the limiting device can be selected such that in a rest state of the belt, the outer surface of the belt mens does not touch the contact area. The distance can also be chosen so that even with a low-vibration normal operation of the vibrating plate of the belt does not touch the limiting device. In other words, the distance may be selected so that the belt does not rub against the limiting device during quiet operation. A permanent contact between the belt and the contact surface of the limiting device, in which the belt could be damaged by friction, for example, can be avoided. The distance may be predetermined such that contact of the outer surface of the belt with the contact region of the delimiter is possible when the belt is vibrating and / or whipping during operation of the vibrating plate. Thus, such vibration or whip movements can be effectively limited. The distance can also be selected so that the belt can come into contact with the contact area only in the case of strong vibrations and / or large whip movements, so that only such strong vibrations and large whip movements are intercepted and reduced.

For example, the distance may be selected to be less than twice the belt height, ie the height of a cut surface of the belt, wherein the cut surface is perpendicular to the running direction of the belt. The height may be determined in such a section, for example, by the height of the resulting in a typical V-belt as a cut surface trapezoid or by the thickness of a flat belt. In one variant, the distance may also be selected to be less than the height of the cut surface. Such a determination of the distance can be achieved that during operation of the belt only strong vibration and whip movements that can affect the life of the belt, are prevented by the contact with the contact surface of the limiting element. In one variant, in each case at least one limiting device can be arranged on both sides of the belt drive, that is to say on a load strand and an empty strand of the belt. In such an arrangement, vibratory movements or whiplash movements may take place on both sides of the belt drive and thus both in a portion of the belt which is guided on a distance from the drive to the driven pulley, as well as on a portion which is at a distance from the output - Is guided to the drive pulley, prevented or reduced. Such an arrangement of at least two limiting devices can so calm the run of the belt on both sides. On both sides of the belt drive, the limiting device can be attached to an inner and / or outer surface of the belt to intercept the deflections of the belt to the inside or outside both on the load strand and on the slack side. Also, the two-sided arrangement of the above-described U-profiles on Lasttrum and slack side of the belt is possible.

In a further embodiment, the limiting device can be structurally integrated with the upper mass and / or the lower mass. This can be achieved for example by a recess in the region of the upper and / or lower mass, in which the belt drive device is installed. Furthermore, the limiting device can also be formed by a protruding block or block with a corresponding arrangement on the upper and / or lower mass.

In a variant of this embodiment, the limiting device can be structurally integrated into a casting of the upper mass and / or the lower mass. In this embodiment, the limiting device is therefore not made as a separate part, but structurally integrated with other castings of the upper and / or lower mass. This allows a simple production with simultaneous stable positioning on the upper or lower mass. Also, the production as a casting allows a suitable, for example, as described above embodiment of the contact area.

A limiting device with configuration according to the above embodiments may also be provided for retrofitting an example, conventional belt-driven vibration plate. For example, it is possible to retrofit the restriction device on a vibration plate with belt drive means to prevent or reduce vibrations and whip movements of the belt as described. These and other advantages and features of the invention are explained in more detail below by means of examples with the aid of the accompanying figures. Show it:

Fig. 1 is a schematic side view of a vibrating plate with

Limiting devices;

Fig. 2 is a detailed side view of a belt drive device with limiting means; and Fig. 3 is a detailed side view of a belt drive device with limiting devices on an inner and Au ßenseite the belt and the slack side and Lasttrum the belt drive device.

In Fig. 1, a vibrating plate with a ground contact plate 1 is shown schematically in a sectional side view.

On the ground contact plate 1, a vibration exciter is arranged, which has an imbalance mass 3, which is held by an imbalance shaft 4. The imbalance shaft 4 is stationary relative to the ground contact plate 1, but rotatably mounted together with the imbalance mass 3. The ground contact plate 1, the vibration exciter 2, the imbalance mass 3 and the imbalance shaft 4 are part of a lower mass U of the vibrating plate.

In a known manner, an upper mass O is coupled on the ground contact plate 1 via spring elements 5, 6 (eg rubber springs).

The upper mass O has a drive motor 7 (eg, a combustion or electric motor) which rotatably drives a drive pulley 8. The drive pulley 8 is designed as a known V-belt pulley and drives a V-belt 9 held by it. The V-belt 9, in turn, runs over an output disk 10, which is likewise designed as a V-belt pulley, so that the drive energy introduced into the drive pulley 8 by the drive motor 7 can be transmitted to the driven pulley 10 via the V-belt 9. The driven pulley 10 in turn is coupled to the imbalance shaft 4 in such a way that the imbalance shaft 4 also rotates with the imbalance mass 3 and generates the desired vibration of the vibration exciter 2 and thus also of the ground contact plate 1. Due to the vibration of the vibration generator 2, the lower mass U is placed in a vibrating or oscillating relative movement to the upper mass O, through which an axial distance between the drive pulley 8 and the driven pulley 10 constantly changes. In this way, the V-belt 9, in particular in the areas between the drive pulley 8 and the driven pulley 10, in which the V-belt 9 does not rest on one of the discs, be put into vibration movements and / or whip movements. In order to reduce such oscillatory movements and whip movements and to prevent large deflections of the V-belt 9, V-belt calmers B1, B2, B3, B5 and B6 are located on the upper mass O and a V-belt calmer B4 is respectively on the lower mass U. Limiting devices or limiting elements arranged inside and outside the belt drive. The V-belt calmers B l, B2, B3 and B4 are laterally adjacent to an outer surface of the V-belt 9 (adjacent to a belt back) and the V-belt calmers B5 and B6 are laterally adjacent to an inner surface of the belt with which the V-belt 9 on the input and output disks 8, 10 rests arranged. In this case, the arrangement may be selected such that a predetermined distance A between the belt back of the V-belt 9 and a contact surface of the V-belt calmers B l, B2, B3, B4 results. The distance A between the belt back of the V-belt 9 and a contact surface of the V-belt calmers B 1, B 2, B 3, B 4, B 5, B 6 can be specified or determined, for example, as the shortest distance between these surfaces in a rest state of the V-belt 9. It may, for example, be predetermined in such a way that contact of the outer surface of the V-belt 9 with the V-belt calmers B1, B2, B3, B4, B5, B6 is only possible if the belt during an operation of the vibration onsplatte a vibrational movement and / or performs a whip movement.

The contact areas of the V-belt calmers B 1 and B 2 facing the outer surface (belt back, back surface) of the V-belt 9 are designed substantially as flat surfaces which are delimited along a longitudinal side of the outer surface of the V-belt 9 by rounded edges. The sides of the contact areas of the V-belt calmers B3, B4, B5 and B6 facing the outer surface or the inner surface of the V-belt 9 are substantially cylindrical. The width of the contact regions of the V-belt calmers B 1, B 2, B 3, B 4, B 5, B 6 extending into the plane of the drawing, that is perpendicular to the drawing surface, may be selected such that it corresponds at least to the width of the outer surface or inner surface of the V-belt 9 (FIG lateral sectional view not removable).

FIG. 2 shows a side view of a further belt drive as a more detailed alternative embodiment of the belt drive of FIG. 1, shown schematically in the frame R. It is shown that arranged laterally adjacent to an outer surface of the belt 9 in a region in which the V-belt 9 does not rest on the drive pulley 8 or the driven pulley 10, the V-belt calmers B l, B2 and with fastening means 1 1, 12, such as screws , are attached. In the shown variant contact areas K l, K2 of V-belt calmers B l, B2 formed by bent metal parts.

Such an attachment of bent metal parts as the V-belt calmers B l, B2 is also suitable, for example, in the retrofitting of known vibration plates to a vibrating plate according to the invention with calmed belt drive.

FIG. 3 shows in a further side view a further belt drive as a more detailed alternative embodiment of the belt drive of FIG. 1 schematically shown in the frame R. 2, further V-belt calmers B5 and B6 arranged opposite the inner surface of the belt are shown in addition to the wedge belt depressors B 1 and B 2 opposite the outer surface of the V-belt 9.

By the inner V-belt calmers B5 and B6, a vibration or whip-like movement of the V-belt 9 can be additionally prevented or collected inward. The shown two-sided arrangement of the V-belt calmers B l, B2, B5, B6 can therefore improve smooth running of the belt and thus further reduce wear of the belt.

In order to prevent damage to the belt when the V-belt 9 is in contact with the inner V-belt calmers, a surface or contact area of the V-belt calmers B5, B6 may have rounded edges or a curved surface. A use of bent metal parts, as shown in Fig. 3, is possible.

Claims

claims

1. Vibration plate for soil compaction, with

an upper mass (O) with a drive motor (7);

a lower mass (U) mounted so as to be resiliently movable with respect to the upper mass (O), having a ground contact plate (1) and a vibration exciter device (2, 3, 4) coupled to the ground contact plate (1);

a belt drive device (8, 9, 10) with a drive pulley (8) which can be driven by the drive motor (7), an output pulley (10) coupled to the vibration exciter device (2, 3, 4) and a drive energy from the drive pulley (8) the driven pulley (9) transmitting belt (10); and with

at least one limiting device (B l, B2, B3, B4, B5, B6), which laterally next to an outer surface and / or an inner surface of the belt (9) in a region in which the belt (9) not with the drive disc (8 ) or output disk (10) is in contact, is arranged, and which on one of the outer and / or inner surface of the belt (9) side facing a contact region.

2. Vibrating plate according to claim 1, wherein the contact region in a running direction and / or against the running direction of the belt (9) is bounded by a rounded edge.

A vibration plate according to claim 1 or 2, wherein the contact portion has a width corresponding to at least a width of the outer surface of the belt (9).

4. Vibration plate according to one of the preceding claims, wherein the contact area is limited at least along a longitudinal side of the outer surface and / or the inner surface of the belt (9) by further rounded edges.

5. Vibration plate according to one of the preceding claims, wherein the limiting means (B l, B2, B3, B4, B5, B6) has a substantially cylindrical contact area.

6. The vibration plate according to any one of the preceding claims, wherein the limiting means (B l, B2, B3, B4, B5, B6) comprises a contact area formed by bending a metal part.

7. Vibration plate according to one of the preceding claims, wherein in a rest state of the belt drive means (8, 9, 10), in which the drive disc (8) and the driven pulley (10) stand still, the contact surface of the limiting means (B l, B2, B3, B4, B5, B6) is arranged at a predetermined distance (A) to the outer surface and / or to the inner surface of the belt (9).

8. Vibration plate according to one of the preceding claims, wherein the distance (A) is less than twice the height of a cut surface, which results in a section through the belt (9) perpendicular to a running direction of the belt (9).

9. vibration plate according to claim 8, wherein the distance (A) is less than the height of the cut surface.

10. Vibration plate according to one of the preceding claims, wherein the distance (A) is predetermined such that in an operation of the vibration plate in a vibratory movement and / or a whiplash movement of the belt (9), the outer surface and / or the inner surface of the belt (9). touches the contact region of the limiting device (B l, B2, B3, B4, B5, B6).

1 1. Vibrating plate according to one of the preceding claims, wherein each of a limiting device (B l, B2, B3, B4, B5, B6) on a slack side and at a load of the belt drive belt drive device (8, 9, 10) is arranged.

12. Vibration plate according to one of the preceding claims, wherein in each case a limiting device (B l, B2, B3, B4, B5, B6) is arranged laterally adjacent to an outer surface and laterally adjacent to an inner surface of the belt (9).

13. Vibration plate according to one of the preceding claims, wherein the limiting device (B l, B2, B3, B4, B5, B6) with the upper mass (O) and / or the lower mass (U) is structurally integrated.

14. Vibration plate according to one of the preceding claims, wherein the limiting device (B l, B2, B3, B4, B5, B6) in a casting of the upper mass (O) and / or the lower mass (U) is structurally integrated.

15. Limiting device (B l, B2, B3, B4, B5, B6) for retrofitting a vibration plate to a vibration plate according to protection claim 1.