EP2558649A2

EP2558649A2 - Arrangement for providing a pulsing compressive force

Info

Publication number: EP2558649A2
Application number: EP10714159A
Authority: EP
Inventors: Roland Anderegg; Martin Gerhard; Kuno Kaufmann; Dominik Anton Von Felten
Original assignee: Ammann Schweiz AG
Current assignee: Ammann Schweiz AG
Priority date: 2010-04-16
Filing date: 2010-04-16
Publication date: 2013-02-20
Anticipated expiration: 2030-04-16
Also published as: WO2011127611A2; US20130058717A1; AU2010351124A1; US8727660B2; WO2011127611A3; EP2558649B1; BR112012026543A2

Abstract

The invention relates to a soil compacting device. The device comprises an exciter part (1), which has an unbalance exciter (2) for producing an intermittent exciter force and which has a contact surface (3) for transmitting a force component of the exciter force directed perpendicularly to the contact surface (3) to the soil surface (4) to be compacted as a pulsing compressive force. The device also comprises a damper part (5), which is connected to the exciter part (1) by means of a spring-damper unit (15). The spring stiffness of the spring-damper unit (15), the damping of the spring-damper unit (15), the spring pre-load of the spring-damper unit (15), the mass of the damper part (5), the mass moment of inertia of the damping part (5), the mass of the exciter part (1), and/or the mass moment of inertia of the exciter part (1) can be varied during operation. It is thereby possible for the first time to provide soil compacting tools functioning according to the damper principle that can always be operated at the optimal operating point for different soil types and during progressing compaction and that have corresponding advantages regarding the compacting performance and durability of the tools.

Description

Arrangement for providing a pulsating

Druckkraf

TECHNICAL AREA

The invention relates to an arrangement for Be ^¬ provision of a pulsating compressive force, a soil compacting device comprising such an arrangement, a method for operating such an arrangement or such a soil compacting device and the use of such a device for soil compaction according to the preambles of the independent claims.

STATE OF THE ART

In particular in the soil compaction compression devices are used, which work according to the so-called absorber principle. Here, a flat plate or a roller body (bandage), which forms the ground contact surface, excited by means of an unbalance exciter to vibrate. The plate or the roller body is connected via a spring-damper system with an absorber mass arranged above it, which is also excited via the spring-damper system to vibrate. If the absorber mass oscillates in phase with the same frequency (1: 1 resonance) or half the frequency (2: 1 resonance) of the plate or the roller body, this machine concept (absorber principle) results in a maximum soil compaction force, which significantly increases or even reduces the power Machines without absorber mass corresponds.

Due to the system, however, the problem arises in such soil compaction equipment that the vibration behavior of the plate or the roller body, which or which excites the absorber mass to vibrate, is influenced by the rigidity of the soil to be compacted, which may be locally different and also changes during compacting of the soil. In practice, this means that simpler devices with fixed excitation frequencies can seldom be operated at the optimum operating point (1: 1 or 2: 1 resonance) and thus can not exploit their performance potential. Also, prolonged operation in the suboptimal range may result in premature wear or ga destruction of the equipment.

In technically more finite devices with controllable unbalance exciters, the desired resonance state can be produced by changing the excitation frequency in a wide range, so that at least the latter problem can be avoided. However, this gives rise to the disadvantage that the excitation frequency required to produce the resonant state is often energetically sub-optimal, which in turn means that even these devices can not fully exploit their power potential.

PRESENTATION OF THE INVENTION

It is therefore the object to provide technical means available with which the previously described disadvantages of the prior art can be at least partially overcome.

This object is solved by the subject matter of claim 1.

Accordingly, a first aspect of the invention relates to an arrangement for providing a pulsating compressive force. The arrangement comprises an exciter part with an unbalance exciter for generating an intermittent excitation force and with a contact surface for transmitting a perpendicular to the contact surface force component of the excitation force as a pulsating pressure force on a tool or on a force to be acted upon by the pressure working surface. Furthermore, the arrangement comprises a Tilgerteil, which is connected to the exciter part via a spring-damper unit, for Bil- tion of an oscillatory system that can be excited by the unbalance exciter to resonant oscillations.

According to the invention, the arrangement is such that the spring stiffness (also called the spring constant) of the spring-damper unit, the damping of the spring-damper unit, the spring preload of the spring-damper unit, the mass of the absorber part, at the spring Damper unit becoming effective mass moment of inertia of Tilgerteils, the mass of the excitation part and / or acting on the spring-damper unit mass moment of inertia of the excitation part is changed in operation or are.

This makes it possible to keep the oscillatory system formed of excitation part, spring-damper unit and Tilgerteil at a given excitation frequency for different coupling stiffness of the contact surface to a tool or a work surface in resonance and thus an energetically optimal operation with a maximum at the To provide contact surface provided pulsating pressure force at different or changing conditions of use. Accordingly, with the arrangement according to the invention, it becomes possible for the first time to provide functioning soil compaction equipment according to the absorber principle, which can always be operated at optimum operating point for different soil types and progressive compaction, with corresponding advantages in terms of compaction performance and durability of the equipment.

Preferably, the unbalance exciter of the inventive arrangement is designed as a directional oscillator or as a circular oscillator. Depending on the intended use, one or the other alternative may be more advantageous. So it is for example in the event that with the arrangement of a vibrating plate is to be formed for soil compaction, advantageous if the unbalance exciter is designed as a directional oscillator, because so By tilting the direction of vibration relative to the vertical at the same time the drive of the vibrating plate can be realized. If, however, a roller train with a separate drive is to be formed with the arrangement, then it is preferable to design the unbalance exciter as a simple circular oscillator since such unbalance exciters are structurally simple to implement and correspondingly robust and cost-effective.

In a preferred embodiment, the arrangement is designed such that the Tilgerteil the arrangement during normal operation in the direction of gravity force exclusively on the exciter part is supported by means of the spring-damper unit. Preferably, the Tilgerteil this is arranged over the exciter part, so that there is a simple structure. Such embodiments of the arrangement are preferably used for the formation of vibrating plates for soil compaction, in which the entire device unit is supported exclusively on the ground via the bottom plate.

In another preferred embodiment, the arrangement is designed such that the Tilgerteil part of the intended operation is partially supported by the spring-damper unit on the exciter part and partly on support means, which are formed separately from the excitation part. In this way, the Tilgerteil performs the intended operation, an intermittent tilting oscillation about a tilt axis in the region of the vibration moderately decoupled from the exciter part support means around. In such an embodiment, the mass moment of inertia of the absorber part which becomes effective on the spring-damper unit and the spring preload of the spring-damper unit can be changed in a simple manner and thus influence the oscillation behavior of the arrangement, in that the weight distribution between that of the exciter part to be carried weight fraction of the absorber part and that of the support means to be carried weight fraction of the absorber part is changed. This can be done for example by moving a weight on the absorber part and is possible with simple means, such as a motor spindle, even during operation.

In yet a further preferred embodiment, the arrangement comprises a rest part, which is connected to the excitation part or the absorber part, such that it forms a coherent unit with this part, but is substantially decoupled from it in terms of vibration. This has the advantage that the arrangement has a partial area which is exposed during operation only relatively low accelerations and therefore as mechanical

Interface to operating personnel and as installation location for any control components.

It is provided in a first preferred variant of this embodiment that the rest part is fully worn during normal operation as intended by the exciter part or by the Tilgerteil. If, for example, the inventive arrangement as hand. guided vibration plate formed for soil compaction, the guide shaft of the vibrating plate, which also carries the controls, such a rest part by being mounted with a vibration-isolating bearing gerger arrangement on the Tilgerteil or on the exciter part and is supported by this.

In a second preferred variant of this embodiment, the rest part is worn during intended operation completely by support means, which are substantially decoupled from the excitation part and the absorber part in terms of vibration. For example, it is envisaged that the arrangement according to the invention as a soil compaction device consisting of a soil compaction attachment and an associated wheel loader or excavator, which in normal operation exclusively the guidance and the drive of the arrangement in horizontal direction but takes over in the vertical direction, the arrangement neither supports nor exerts a force on them to train. The Bodenverdichtungs-Vorsat zgerät can be formed as a vibrating plate or as a vibratory roller body.

In a third preferred variant of this

Embodiment, it is provided that the rest part is carried in the intended operation partially by the exciter part or the absorber part and partly by support means, which are vibration decoupled substantially from the exciter part and the Tilgerteil. If, for example, the arrangement according to the invention is designed as a compactor for compacting the soil, the drive unit forms such a resting part with the driver's cab by supporting itself on one end with vibration isolating bearings on the exciter part designed as a roller body or on the absorber part and on the other end Driving wheels on the ground.

In this third preferred variant, it is advantageous that the arrangement is embodied such that, during operation, a change in the weight distribution between the weight portion of the rest portion to be supported by the exciter portion or the absorber portion and the weight portion of the weight portion to be supported by the suspension elements Resting part is possible, preferably by pushing a weight on the rest part. As a result, it is easy to influence the vibration behavior of the arrangement.

Furthermore, it is preferred in embodiments of the inventive arrangement with rest part that the arrangement is designed such that a change in the mass of the absorber part, the moment of inertia of the absorber part, the mass of the exciter part and / or the moment of inertia of the exciter part is thereby possible, that one or more fluid volumes between the rest part and the excitation part and / or the

Tilgerteil is or will be replaced. In this way can influence the Schwingungsver ^¬ keep the arrangement in many areas. Likewise, it is also conceivable to change the mass moment of inertia of the exciter part and / or the absorber part in that one or more liquid volumes are displaced within the exciter part and / or within the absorber part in each case.

If the arrangement according to the invention is designed such that a change in the mass of the absorber part, the mass moment of inertia of the absorber part, the mass of the excitation part and / or the mass moment of inertia of the exciter part is possible because one or more liquid volumes are exchanged between the absorber part and the exciter part which is preferred, the vibration behavior of the arrangement can be influenced in wide ranges even without the presence of a rest part.

In a further preferred embodiment, the arrangement according to the invention is designed such that the absorber part and / or the excitation part has at least two masses which are movable against one another when the absorber part or excitation part is accelerated in a direction perpendicular to the contact surface, wherein the spring force is changeable during operation. As a result, at a constant mass of the absorber or excitation part in a simple manner, the mass moment of inertia of the absorber part or of the exciter part, which is effective on the spring-damper system, can be changed.

In yet another preferred embodiment, the inventive arrangement is designed such that a change in the spring stiffness of the spring-damper unit by stiffening of spring elements of the spring-damper unit and / or by changing the application of force in spring elements of the spring-damper unit possible is. In the former case, it is provided, for example, to use elastomeric hollow springs, the spring stiffness by applying their Interior can be changed with a pressurized fluid via a change in the fluid pressure. In the latter case, the change of the force is preferably carried out by changing a translation of the introduced forces, eg by means of length-variable toggle.

If the arrangement according to the invention is designed in such a way that the frequency of the excitation force, the magnitude of the excitation force and / or the effective direction of the excitation force of the unbalance exciter can be changed during operation, which is likewise preferred, the advantage arises that the arrangement has a maximum Has flexibility to adapt to different or changing operating conditions.

Further, it is preferred that the arrangement comprises a particular electronic control unit with which the spring stiffness of the spring-damper unit, the damping of the spring-damper unit, the spring bias of the spring-damper unit, the mass of Tilgerteils, the mass moment of inertia of Tilgerteils, the mass of the excitation part and / or the moment of inertia of the excitation part in operation is automatically adjustable depending on measured system variables or are, preferably such that the Tilgerteil resonates with the exciter part, advantageously with the same Frequency or at half the frequency of the excitation part.

If the arrangement according to the invention is designed in such a way that the frequency of the excitation force, the magnitude of the excitation force and / or the direction of action of the excitation force of the unbalance exciter can be changed during operation, which is preferred, it is advantageous that the Control or regulation. In addition, the frequency of the excitation force, the magnitude of the excitation force and / or the effective direction of the excitation force of the unbalance exciter in operation are automatically and automatically adjusted as a function of measured system variables. is adjustable or are, preferably such that the Tilgerteil resonates with the exciter part, advantageously with the same frequency or at half the frequency of the exciter part.

With such an inventive arrangements, it is possible to provide soil compaction devices for Ver ^¬ addition which always work automatically in the optimum operating point.

A second aspect of the invention relates to a soil compaction device with an arrangement according to the first aspect of the invention, in which the designated contact surface of the arrangement serves as a tool for compaction of the soil in the intended operation. In such devices, the advantages of the invention are particularly evident.

In a preferred embodiment, the

Soil compacting device a vibrating plate or a roller, in particular a roller with one or two in the rolling direction successively arranged vibration-excited roller bodies (bandages).

A third aspect relates to a method for

Operating the arrangement according to the first aspect of the invention or the soil compacting device according to the second aspect of the invention. According to the method, the arrangement is intended with the contact surface in contact with a work performing tool or a work surface to be processed, preferably to be compacted, such as e.g. a floor area to be compacted.

The spring stiffness (also called spring constant) of the spring-damper unit, the damping of the spring-damper unit, the spring preload of the spring-damper unit, the mass of the absorber part, the mass moment of inertia of the absorber part, the mass of the exciter part and / or the mass moment of inertia of the exciter part is changed so that the oscillation behavior of the oscillatable system is formed by excitation part, changed the damper unit and Tilgerteil. In this way it is possible to optimize the arrangement or the soil compaction device for a wide variety of applications or operating situations.

In a preferred embodiment of the method, the frequency of the excitation force, the magnitude of the excitation force and / or the effective direction of the excitation force of the unbalance exciter is also changed during normal operation, whereby an even better adaptation of the arrangement or soil compaction device to a variety of operating conditions is possible.

Preferably, in the inventive method, the spring stiffness of the spring-damper unit, the damping of the spring-damper unit, the spring preload of the spring-damper unit, the mass of the Tilgerteils, the moment of inertia of the absorber part, the mass of the exciter part and / or the moment of inertia of the exciter part, and / or, where applicable, the frequency of the excitation force, the magnitude of the excitation force and / or the effective direction of the excitation force of the unbalance exciter changed such that the absorber part resonates with the exciter part, preferably with the same Frequency or at half the frequency of the excitation part. As a result, a pulsating pressure force of maximum size can be made available at the contact surface of the arrangement according to the invention.

In a further preferred embodiment of the method, during the intended operation of the arrangement, system parameters of the system excited by the unbalance exciter are determined from exciter part, spring-damper unit and absorber part, in particular the accelerations of the exciter part and / or the absorber part in the direction perpendicular to the contact surface and the rotational frequency of the unbalance exciter. Changing the spring stiffness of the spring-damper unit, the damping of the spring-damper unit, the spring Preload the spring-damper unit, the mass of the absorber part, the mass moment of inertia of the absorber part, the mass of the excitation part and / or the moment of inertia of the exciter part, and / or, where applicable, the frequency of the excitation force, the size of the excitation force and / or The effective direction of the excitation force of the unbalance exciter takes place as a function of one or more of the determined system parameters. In this way, a specific vibration behavior of the oscillatory system formed from exciter part, spring-damper unit and Tilgerteil can be set specifically.

Preferably, in the method according to the invention, the spring stiffness of the spring-damper unit, the damping of the spring-damper unit, the spring preload of the spring-damper unit, the mass of the absorber part, the mass moment of inertia of the absorber part, the mass of the excitation part, are changed and / or the mass moment of inertia of the excitation part and / or, where applicable, the frequency of the excitation force, the size of the excitation force and / or the effective direction of the excitation force of the unbalance exciter and, where appropriate, the determination of the system parameters automatically via a particular electronic control or control unit. This makes it possible to design the arrangement or the soil compaction device in such a way that it automatically adapts to the operating situation encountered during normal operation, for example, always adjusted in such a way that the absorber part resonates with the exciter part, with the highest possible exciter frequency.

A fourth aspect of the invention relates to

Use of the arrangement according to the first aspect of the invention for soil compaction. In such use, the advantages of the invention are particularly evident. BRIEF DESCRIPTION OF THE DRAWINGS

Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:

1 shows a side view of a first vibrating plate according to the invention for ground compaction;

FIG. 2 shows the vibration control model of the oscillatory system of the vibration plate from FIG. 1; FIG.

Figures 3a to 3c sections through an elastomeric hollow spring of the oscillatory system of the vibrating plate of Figure 1 at different internal cavity pressures.

4 shows a side view of a second vibrating plate according to the invention for ground compaction;

5 shows the vibration control model of the oscillatory system of the vibration plate of FIG. 4;

6 shows a side view of a first compactor according to the invention for soil compaction;

FIG. 7 shows the vibration control model of the oscillatory system of the roller according to FIG. 6; FIG.

8 shows a side view of a second compactor according to the invention for soil compaction;

9 shows a side view of a third compactor according to the invention for soil compaction;

10 is a schematic representation of a spring-damper system with adjustable spring stiffness; and

11 shows a section through a Tilgerteil with adjustable moment of inertia.

WAYS FOR CARRYING OUT THE INVENTION

Fig. 1 shows a first inventive, designed as a vibration plate soil compaction device in side view. Fig. 2 shows schematically the vibration control model of the oscillatory system of this vibrating plate. As can be seen, the vibrating plate on an undercarriage 1 (demanding Erregerteil) and a superstructure 5 (claims Tilgerteil) on.

The undercarriage 1 comprises a ground contact plate 13, which has on its underside a contact surface 3 for the initiation of the vibrating plate generated by the pulsating pressure force in the bottom 4 to be compacted, and designed as a directional vibrator unbalance exciter 2 with a hydraulic motor, which is a substantially vertically directed generates intermittent excitation force, which is introduced into the ground contact plate 13.

The uppercarriage 5 comprises a drive unit 14 with a diesel engine which drives a hydraulic pump and an air compressor. The hydraulic pump supplies the hydraulic motor of the unbalance exciter 2 via hydraulic hoses with a stream of pressurized hydraulic fluid to drive the unbalance exciter 2. The chassis of the superstructure 5 is dimensioned in terms of weight such that, together with the drive unit 14, a certain total mass of the Superstructure as absorber mass results.

The superstructure 5 is supported in the direction of gravity via four in their spring stiffness and their damping behavior changeable elastomeric hollow springs 15 (claimed spring-damper unit) on the undercarriage 1 from. Another support of the superstructure 5 in the direction of gravity does not exist.

2, the elastomeric hollow springs 15 are represented by the spring 15a with the spring stiffness k2 and the damper 15b with the damping d2. The mass of the superstructure 5 is designated m2g and that of the undercarriage 1 mlg, the movements of the upper and lower carriage vertically x2 and xl. The spring stiffness of the bottom 4 is denoted by kl and its damping with dl. Next is in Fig. 2 denotes the rotational frequency of the unbalance exciter 2 with Ω1 and its excitation force with Fl.

The construction of the elastomeric hollow springs 15 can be seen from FIGS. 3 a to 3 c, which show sections through one of the elastomeric hollow springs 15 at an overpressure in the interior 16 of 0 bar (FIG. 3 a), 2 bar (FIG. 3 b) ) and 4 bar (Figure 3c). As can be seen, the elastomeric body 17 of the elastomeric hollow spring 15 increasingly stretches in the axial direction (loading direction) with increasing pressure in the interior 16 and bulges progressively in the radial direction. It increases with increasing pressure in the interior 16, the stiffness of the elastomeric hollow spring 15.

In the vibrating plate shown in Fig. 1, the interiors 16 of the elastomeric spring elements 15 are connected via lines and control valves to the air compressor of the drive unit 14 and can be targeted so with an overpressure between 0 bar and 6 bar, to change the spring stiffness of the elastomer Spring elements 15.

Attached to the superstructure 5 by means of vibration-isolating fastening elements 8 is a guide tongue 9 (demanding rest part) which carries the operating elements and serves to guide the vibration plate by an operator. The vibration-isolating fasteners 8 are designed such that the guide tongue 9 forms a coherent unit with the superstructure 5, but is substantially decoupled from this vibrationally.

Furthermore, the vibration plate comprises an electronic control or regulation unit, by means of which in operation the accelerations of the undercarriage 1 and the undercarriage 1 in the vertical direction, ie perpendicular to the contact surface 3, and the rotational frequency Ω1 of the unbalance exciter 2 can be determined and in dependence from these determined system parameters, the stiffness and damping of the elastomeric spring elements 15 by Change in the pressure in the interior 16 can be changed automatically such that the superstructure 5 always resonates with the undercarriage 1. In addition, the control unit can automatically regulate the rotational frequency of the unbalance exciter 2 during operation in such a way that a maximum compaction power is achieved.

Fig. 4 shows a second invention, designed as a vibrating plate soil compaction device in side view and Fig. 5 shows schematically the vibration control model of the oscillatory system of this second vibrating plate.

As can be seen, this vibration plate except for a few details of the same structure as the first vibrating plate according to Figures 1 and 2. A major difference, however, is that in the vibrating plate shown here the superstructure 5 not changeable in their rigidity Elastomeric springs 18 supported on the undercarriage 1. In the vibration-technical model according to FIG. 5, the elastomer springs 18 are represented by the spring 18a with the spring stiffness k2 and the damper 18b with the damping d2.

Another essential difference is that in this case the masses mlg, m2g of the undercarriage 1 and the uppercarriage 5 can be selectively changed during operation by exchanging liquid between the upper 5 and the undercarriage 1 via a connecting hose 12. For this purpose, ballast tanks designed as piston accumulators are provided both in the undercarriage 1 and in the superstructure 5, the volume of which can be selectively and oppositely changed by means of hydraulic drives and an associated control or regulation unit.

In the present case, the electronic control unit is also designed in such a way that during operation the accelerations of the upper carriage 5 and the lower carriage 1 are moved in vertical direction. tion, ie perpendicular to the contact surface 3, as well as the rotational frequency Ω1 of the unbalance exciter can determine. In contrast to the control or regulation unit of the vibrating plate according to FIGS. 1 and 2, however, the control or regulating unit changes the masses mlg, m2g of undercarriage 1 and superstructure 5 automatically in operation in dependence on these determined system parameters such that the Uppercar 5 resonates with the undercarriage 1.

6 shows a first embodiment of a ground compaction device according to the invention designed as a compactor in side view, and FIG. 7 shows schematically the oscillation-technical model of the oscillatory system of this compactor.

As can be seen, the compactor comprises a front part 19 and a rear part 20, which are connected to one another via an articulated joint 21.

The front part 19 of the roller compactor consists essentially of a roller body 23 (demanding Erregerteil) and a chassis frame 25 (claim damper Tilgerteil).

The roller body 23 comprises a bandage 11, which has the contact surface 3 for the initiation of the generated pulsating pressure force in the bottom 4 to be compacted, and formed as a circular vibrator unbalance exciter 2 with a hydraulic motor which generates a respect to their direction of action intermittent excitation force in the Bandage 11 is initiated.

The chassis frame 25 is supported in the direction of gravity via two spring-damper arrangements 22 (spring-damper unit according to the requirements) with constant rigidity and damping on the two end-side bearings of the roller body 23 and is provided with vibration-isolating fastening elements 8 connected to the articulated joint 21, which is supported by the rear part 20 of the compactor. The vibration isolating fasteners 8 are designed such that the rear part 20 of the compactor with the chassis frame 25 forms a coherent unit, but is vibrationally decoupled substantially from this and thus represents a claim according Ruheteil.

The rear part 20 of the roller compactor consists essentially of a drive unit 14 with a diesel engine, which drives a hydraulic pump, and a driver's cab 6. It is supported by two drive wheels 10 driven by hydraulic motors on the floor 4. During operation, the hydraulic pump supplies the hydraulic motor of the unbalance exciter 2 by means of hydraulic hoses

Roller body 23 and the hydraulic motors of the drive wheels 10 each having a flow of pressurized hydraulic fluid, for driving the drive wheels 10 and the unbalance exciter 2 of the roller body 23rd

In the rear part 20 and in the chassis frame 25 of the

Front part 19 of the compactor liquid tanks are arranged, between which liquid can be exchanged via a hose line 7. This makes it possible to change the mass m2g of the chassis frame 25 during operation.

Depending on the weight distribution, the chassis frame 25 is additionally supported via the articulated joint 21 on the rear part 20 of the compactor, or the rear part 20 is additionally supported on the chassis frame 25 via the articulated joint 21.

In the vibration control model according to FIG. 7, the spring-damper arrangements 22 are represented by the spring 22a with the spring stiffness k2 and the damper 22b with the damping d2. The mass of the chassis frame 25 is designated m2g and that of the roller body 23 is designated mlg. The movement of the chassis frame 25 is denoted by x2 and that of the roller body 23 by xl. The spring stiffness of the bottom 4 is denoted by kl and its damping with dl. In addition, in FIG. 7 the rotational frequency of the unbalance exciter 2 is denoted by Ω1 and its exciter force is designated by Fl. Next, the compactor is equipped with an electronic control unit, which makes it possible to determine during operation, the accelerations of the chassis frame 25 and the roller body 23 in the vertical direction and the rotational frequency Ω1 of the unbalance exciter and in dependence on these determined system parameters Mass m2g of the chassis frame 25 automatically adjust such that the chassis frame 25 always resonates with the roller body 23.

FIG. 8 shows a side view of a second embodiment of a ground compaction device according to the invention designed as a compactor.

This second compactor differs from the first compactor shown in FIG. 6 only in that the rear part 20 of the compactor is formed by a wheel loader which is fully supported on four drive wheels 10a, 10b of two consecutively arranged axles and thus with the chassis frame 25 is connected, that in normal operation it only guides and drives it in a horizontal direction, but does not pick up any forces acting in the vertical direction or transmit them to it. Again, the rear part 20 is vibrationally decoupled from the chassis frame 25 and of the roller body 23 of the front part 19 of the drum and thus forms a

demanding rest part.

FIG. 9 shows a third embodiment of a ground compaction device according to the invention designed as a compactor in a side view. This is an unmanned compactor, which is operated via a radio remote control.

As can be seen, this third compactor comprises a roller body 23 (damaging exciter part) and a chassis frame 25 (damper damper part), which in the direction of gravity at one end via two spring-damper assemblies 22 (sophisticated spring damper). Unit) with invariable and damping on the two end-side bearings of the roller body 23 is supported and at its other end on two driven by hydraulic motors drive wheels 10th

The roller body 23 comprises a bandage 11, which has the contact surface 3 for the introduction of the generated pulsating pressure force into the bottom 4 to be compacted, and an unbalance exciter 2 designed as a circular oscillator with a hydraulic motor which generates an exciter force which is intermittent with respect to its effective direction is introduced into the bandage 11.

The chassis frame 25 carries in the area in which it is supported on the drive wheels 10, a drive unit 14 with a diesel engine, which drives a hydraulic pump. In operation, the hydraulic pump supplies the hydraulic motor of the unbalance exciter 2 of the roller body 23 via hydraulic hoses and the hydraulic motors of the drive wheels 10 each with a flow of pressurized hydraulic fluid for driving the drive wheels 10 and the unbalance exciter 2 of the roller body 23.

In the area between the drive unit 14 and the roller body 23, the chassis frame 25 carries a trim weight 26 which can be displaced in operation in the longitudinal direction L by means of a hydraulic motor and a threaded spindle. As a result, the mass moment of inertia of the chassis frame 25 which becomes active on the spring damper arrangements 22 and which during operation performs a tilting oscillation around an axis of rotation in the area of the contact surface of the drive wheels 10 can be changed and the supporting load of the spring damper mechanism can be changed. Arrangements 22, whereby the spring bias changes.

This third compactor is also equipped with an electronic control unit which makes it possible, during operation, to accelerate the chassis frame 25 and the roller body 23 in FIG vertical direction and the rotational frequency Ω1 of the unbalance exciter to determine and, depending on these determined system parameters, the mass m2g of the chassis frame 25 automatically such that the chassis frame 25 always resonates with the roller body 23.

Fig. 10 shows a conceptual representation of a spring-damper assembly 31, the spring stiffness can be changed by changing the application of force in the spring-damper unit. As can be seen, the spring-damper unit of this arrangement 31 is formed by two polymer spring elements 18, which are fastened at one end to the intended loading direction B on a first connection plate 27. At its other end, the polymer spring elements 18 are tiltably attached to spindle nuts 28, which can be moved towards or away from each other by means of an adjusting spindle 29 in a direction perpendicular to the loading direction B, so that the polymer spring elements 18 are rotated by a desired angle relative to the loading direction B can be inclined. The spindle nuts 28 are arranged in a guide 32 in a second connection plate 30, such that when the second connection plate 30 is loaded with a force acting in the intended loading direction B, this force is introduced into the polymer spring elements 18 and transmitted to the first connection plate 27. The greater the set angle of inclination α of the polymer spring elements 18 with respect to the intended loading direction B, the lower the spring stiffness of this spring-damper arrangement 31.

Fig. 11 shows a section through a Tilgerteil with variable moment of inertia. The absorber part comprises a base plate 33 and a cover 34, which together form a closed space 35. Arranged in this space 35 are two absorber weights 36, each with a constant mass, which are connected via articulated arrangements. gene 37 and pneumatic spring elements 38 are connected to each other and with the base plate 33 so that they are against the spring force of the spring elements 38 to each other in acceleration of the absorber part in and against the direction of gravity S against each other. The spring force of the spring elements 38 can be changed during operation by the pressure in the cylinder chambers via compressed air hoses (not shown) is changed. As a result, the mass moment of inertia of this absorber part can be changed in and against the direction of gravity.

While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited to these and may be practiced otherwise within the scope of the following claims.

Claims

An arrangement for providing a pulsating compressive force, comprising

a) an excitation part (1, 23) with an imbalance exciter (2) for generating an intermittent

Excitation force and with a contact surface (3) for transmitting a perpendicular to the contact surface force component of the excitation force as a pulsating pressure force on a tool or on a force to be acted upon by the pressure working surface (4), and

b) a Tilgerteil (5, 25), which with the exciter part (1, 23) via a spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b) is connected, for forming a vibratory system which can be excited by the unbalance exciter (2) to produce resonant oscillations,

characterized in that the arrangement is such that the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring Damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the spring bias of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the mass (m2) of the absorber part (5, 25), the mass moment of inertia of the absorber part (5, 25), the mass (ml) of the exciter part (1, 23) and / or the mass moment of inertia of the exciter part (1, 23) is or can be changed during operation.

2. Arrangement according to claim 1, characterized in that the unbalance exciter (2) is designed as a directional oscillator or as a circular oscillator, for generating an intermittent excitation force.

3. Arrangement according to one of the preceding claims, characterized in that the arrangement is designed such that during normal operation of the Tilgerteil (5, 25) in the gravitational direction via the spring-damper unit (15, 15a, 15b, 18 . 18a, 18b, 22, 22a, 22b) exclusively on the exciter part (1, 23) is supported.

4. Arrangement according to one of claims 1 to 2, characterized in that the arrangement is designed such that the Tilgerteil (5, 25) during normal operation partially on the spring-damper unit (15, 15 a, 15 b, 18, 18a, 18b, 22, 22a, 22b) on the exciter part (1, 23) and partially supported on support means (8, 10), which are formed separately from the excitation part (1, 23).

5. Arrangement according to one of the preceding claims, characterized in that the arrangement has a rest part (9, 20) which is connected to the excitation part (1, 23) or the Tilgerteil (5, 25), such that it with the Exciter part (1, 23) or the Tilger- part (5, 25) forms a coherent unit, but vibration is substantially decoupled from it.

6. Arrangement according to claim 5, characterized in that the rest part (9, 20) during normal operation completely by the exciter part (1, 23) or by the Tilgerteil (5, 25) is supported.

7. Arrangement according to claim 5, characterized in that the rest part (9, 20) during normal operation completely by support means (10a, 10b) is supported, which vibrationally substantially decoupled from the excitation part (1, 23) and the absorber part (5 , 25).

8. Arrangement according to claim 5, characterized in that the rest part (9, 20) during normal operation partially by the exciter part (1, 23) or the absorber part (5, 25) is supported and partially by suspension elements (10), which vibrationally essentially decoupled from the exciter part (1, 23) and the absorber part (5, 25).

9. Arrangement according to claim 8, characterized in that the arrangement is designed such that during operation, a change in the weight distribution between the weight portion of the rest portion (9, 20) to be supported by the exciter portion (1, 23) or the absorber portion (5, 25) and the weight portion of the rest portion (9, 20) to be supported by the support means (10), in particular by shifting a weight on the rest part (9, 20).

10. Arrangement according to one of claims 5 to 9, characterized in that the arrangement is designed such that a change in the mass (m2) of the absorber part (5, 25), the moment of inertia of the absorber part (5, 25), the mass ( ml) of the exciter part (1, 23) and / or the mass moment of inertia of the excitation part (1, 23) is possible in that one or more liquid volumes between the rest part (9, 20) and the exciter part (1, 23) and / or the Tilgerteil (5, 25) is replaced or become.

11. Arrangement according to one of the preceding claims, characterized in that the arrangement is designed such that a change in the mass (m2) of the absorber part (5, 25), the moment of inertia of the absorber part (5, 25), the mass (ml) of the exciter part (1, 23) and / or the mass moment of inertia of the excitation part (1, 23) is possible in that one or more liquid volumes between the Tilgerteil (5, 25) and the exciter part (1, 23) is replaced or become.

12. Arrangement according to one of the preceding

Claims, characterized in that the Tilgerteil (5, 25) and / or the exciter part (1, 23) has at least two masses, which in acceleration of the Tilgerteils (5, 25) and the exciter part (1, 23) in one direction perpendicular to the contact surface (3) against a spring force are mutually movable, wherein the spring force is variable during operation, for changing the moment of inertia of the absorber part (5, 25) and the exciter part (1, 23).

13. Arrangement according to one of the preceding

Claims, characterized in that the arrangement is formed such that a change in the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b) by stiffening of spring elements (6) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b) and / or by changing the introduction of force into spring elements (6) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b) is possible, in particular by changing a translation of the introduced forces.

14. Arrangement according to one of the preceding claims, characterized in that the arrangement is designed such that the frequency (Ω1) of the excitation force (Fl), the size of the excitation force (Fl) and / or the effective direction of the excitation force (Fl) of the unbalance exciter (2) is or may be changed during operation.

15. Arrangement according to one of the preceding

Claims, characterized in that they have a

Control unit comprises, with which the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring-damper Unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the spring bias of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the Mass (m2) of the absorber part (5, 25), the mass moment of inertia of the absorber part (5, 25), the mass (ml) of the exciter part (1, 23) and / or the mass moment of inertia of the exciter part (1, 23) during operation is automatically adjustable in dependence on measured system variables or are, in particular such that the Tilgerteil (5, 25) in resonance with the exciter part (1, 23) oscillates, in particular with the same frequency or with half the frequency of the exciter part (1, 23).

16. Arrangement according to claim 14 and according to claim 15, characterized in that the control unit additionally the frequency (Ω1) of the excitation force (Fl), the size of the excitation force (Fl) and / or the effective direction of the excitation force (Fl ) of the unbalance exciter (2) is automatically adjustable in operation as a function of measured system variables or are, in particular such that the Tilgerteil (5, 25) in resonance with the exciter part (1, 23) oscillates, in particular at the same frequency or at half the frequency of the exciter part (1, 23).

A soil compacting apparatus comprising an assembly according to any one of the preceding claims.

18. Soil compacting device according to claim 17, characterized in that it is a Vibra- tion plate or roller, in particular a roller with one or two vibration-excited bandages (11).

19. A method for operating an arrangement or a soil compacting device according to one of the preceding claims, characterized by the

Steps:

a) intended operation of the arrangement with the contact surface (3) in contact with a work performing tool or to be processed, in particular to be compressed working surface (4);

b) changing the spring stiffness (k2) of

Spring damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22nd , 22a, 22b), the spring preload of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the mass (m2) of the absorber part (5, 25), the mass moment of inertia of Tilgerteils (5, 25), the mass (ml) of the exciter part (1, 23) and / or the moment of inertia of the exciter part (1, 23) during the normal operation of the arrangement.

20. The method according to claim 19, characterized in that the frequency (Ω1) of the excitation force (Fl), the size of the excitation force (Fl) and / or the effective direction of the excitation force (Fl) of the unbalance exciter (2) during normal operation of the arrangement ver - changes or will be.

21. The method according to any one of claims 19 to

20, characterized in that the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring-damper unit (15 , 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the spring bias of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the mass (m2 ) of the absorber part (5, 25), the mass moment of inertia of the absorber part (5, 25), the mass (ml) of the exciter part (1, 23) and / or the mass moment of inertia of the excitation part (1, 23), and / or true, the frequency (Ω1) of the excitation force (Fl), the magnitude of the excitation force (Fl) and / or the effective direction of the excitation force (Fl) of the unbalance exciter

(2) is changed such that the absorber part (5, 25) resonates with the exciter part (1, 23), in particular at the same frequency or at half the frequency of the exciter part (1, 23).

22. The method according to any one of claims 19 to

21, characterized in that during the intended operation of the arrangement system parameters of the unbalance exciter (2) to vibrate excited system formed from exciter part (1, 23), spring-damper unit (15, 15a, 15b, 18, 18a , 18b, 22, 22a, 22b) and Tilgerteil (5, 25) are determined, in particular the accelerations of the excitation part (1, 23) and / or the Tilgerteils (5, 25) in the direction perpendicular to the contact surface

(3) and the rotational frequency (Ω1) of the unbalance exciter (2), and that the changing of the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the spring bias of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the mass (m2) of the absorber part (5, 25), the mass moment of inertia of the absorber part (5, 25), the mass (ml) of the excitation part (1, 23) and / or the mass moment of inertia of the absorber part Exciter part (1, 23), and / or, where applicable, the frequency (Ω1) of the excitatory power (Fl), the magnitude of the excitation force (Fl) and / or the effective direction of the excitation force (Fl) of the unbalance exciter (2) in dependence on one or more of the determined system parameters.

23. The method according to any one of claims 19 to 22, characterized in that the changing of the spring stiffness (k2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the damping (d2) of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the spring bias of the spring-damper unit (15, 15a, 15b, 18, 18a, 18b, 22, 22a, 22b), the mass (m2) of the absorber part (5, 25), the mass moment of inertia of the absorber part (5, 25), the mass (ml) of the excitation part (1, 23) and / or the mass moment of inertia of the absorber part Exciter parts (1, 23) and / or, where appropriate, the frequency (Ω1) of the excitation force (Fl), the size of the excitation force (Fl) and / or the effective direction of the excitation force (Fl) of the unbalance exciter (2) automates by means of a Steuerungbzw. Control unit takes place.

24. Use of the arrangement according to one of claims 1 to 16 for soil compaction.