EP2987909B1 - Soil compactor - Google Patents

Description

The present invention relates to a soil compactor comprising at least one compressor roller rotatable about a roller rotation axis, at least one edge processing device and a liquid storage / dispensing system for storing and dispensing fluid to at least one compressor roller and at least one edge processing device.

Such soil compactors, generally self-propelled soil compactors, are used, for example, in road construction to compact the road surface or the road surface, in particular an asphalt surface. When compacting easily adhering materials such. As asphalt, care must be taken that the coming into contact with this material areas of the soil compactor, in particular so the compressor rollers are treated so that the material to be compacted does not adhere to these.

From the US 8,500,363 B2 a self-propelled soil compactor according to the preamble of claim 1 is known, which comprises in each of a front and a rear portion of a machine frame a compressor roller, which are provided in this embodiment example by a group of adjacent to each respective compressor roller rotation axis adjacent wheels with pneumatic tires. Also within the meaning of the present invention, such a group of adjacent wheels may be considered as providing a compacting roller.

This known soil compactor comprises a liquid storage / dispensing system with a liquid storage. By a pump, the liquid stored in this liquid store, ie water, is conveyed in the direction of a first liquid dispensing unit, through which the liquid is applied to the surface of one of the compressor rolls, ie the tire or wheels providing said compacting roll. Further, this pump promotes fluid to a arranged next to one of the rollers Edge processing device, which serves to smooth or bevel the edge region of a roadway to be built up from asphalt material to be compacted. This edge processing device is associated with a second liquid dispensing unit. The supply of liquid to the first liquid dispensing unit or the second liquid dispensing unit can be interrupted by respective valves which are arranged in respective liquid discharge lines from the liquid pump to the liquid dispensing units.

Since in this known soil compactor, the discharge of liquid to the one or more compressor rollers and the edge processing device on the other hand preferably via a common fluid pump, there is a strong interdependence in the operation of this system areas to be fed with liquid. Basically, the liquid pump must be designed so that its delivery capacity is sufficient to feed all system areas at the same time. This means that when, for example, only one edging device has to be supplied with liquid, a liquid pump is to be operated which is clearly oversized for this operation. In case of failure of the only existing liquid pump neither the compressor rollers, nor the edge processing can be fed with liquid, so that further operation of the soil compactor is practically impossible. In an alternative embodiment, in this known soil compactor two independent pumps for feeding liquid to a compressor roller on the one hand and a peripheral processing device on the other hand can be used.

From the JP 2004 244883 A For example, a fluid supply system for supplying fluid to the two compressor rollers of a soil compactor is known. In this known device, the liquid contained in two liquid reservoirs is conveyed by the liquid spokes separately associated pumps to the compressor rollers associated liquid dispensing units.

The US 2004/0018053 A1 discloses a soil compactor in which, in association with respective compressor rollers provided on a front end and a rear carriage, independently operating fluid storage / dispensing systems are provided with a liquid pump conveying a liquid from a reservoir to a liquid to a compressor roller dispensing liquid dispensing unit. The liquid storage / dispensing systems may each comprise auxiliary systems having a stand-alone liquid pump and a liquid dispensing unit fed by it.

It is the object of the present invention, a soil compactor with the structure specified above in such a way that with a simple structure an improved operating characteristics and increased reliability of the liquid storage / discharge system is achieved.

According to the invention, this object is achieved by a soil compactor according to claim 1. This comprises at least one rotatable about a roller rotation axis compressor roller, at least one edging device and a liquid storage / dispensing system for storing and dispensing liquid to at least one compressor roller and at least one edge processing device of the soil compactor ,

In this case, it is further provided that the liquid storage / dispensing system comprises two first liquid pumps for conveying liquid to at least one first liquid dispensing unit associated with a compressor roller and a second liquid pump for conveying liquid to at least one second liquid dispensing unit associated with an edge processing device.

The construction is further such that the two first liquid pumps and the second liquid pump receive liquid in parallel from one another from an intermediate liquid line, and that the two first liquid pumps are in parallel to one another in at least a first liquid Dispensing liquid discharge unit leading first liquid discharge line and the second liquid pump emits liquid in a leading to at least a second liquid discharge unit second liquid discharge line. All liquid pumps can thus absorb liquid via a common liquid intermediate line and then deliver it separately via respective discharge lines to the system areas to be supplied with liquid.

Since in particular the supply of the compressor roller / s with liquid is of outstanding importance, two first liquid pumps and one second liquid pump are provided according to the invention. In the event of failure of a first liquid pump, liquid can then be conveyed to the compressor roller (s) via the other first liquid pump, thus continuing the compacting operation of a soil compactor, in particular when compacting asphalt. Since the failure of the liquid supply to the edge processing device (s) does not fundamentally affect the operability of the soil compactor, as is the case with the liquid supply to compressor rolls, the provision of only a single second liquid pump, ie the lack of redundancy in this region, the structure of the overall system are kept simple and compact.

In the soil compactor constructed according to the invention, therefore, the system areas compressor roller (s) on the one hand and edge treatment device (s) on the other hand can be supplied with fluid independently of one another by liquid pumps which can also be operated autonomously. On the one hand, this allows the dimensioning of the liquid pumps assigned to these different system areas in such a way that they are designed for the respectively required quantity of liquid, thus overdimensioning can be avoided. On the other hand, there is no mutual interaction in operation, which also increases the reliability, since, for example, a defect of a second liquid pump does not affect the supply of liquid to the compressor or the rollers.

In order to make the liquid line system in the ground compactor according to the invention as simple as possible, it is proposed that the two first liquid pumps and the second liquid pump are connected in parallel to each other.

The provision of independently operable liquid pumps in association with the compressor roller (s), on the one hand, and to the edge treatment device (s), on the other hand, makes it possible to design or dimension these fluid pumps independently of each other. Since there is generally a greater fluid requirement in the compressor roller (s), it can therefore be provided that the second fluid pump has a lower maximum flow rate than at least one first fluid pump.

In order to be able to store a sufficient amount of liquid in the ground compactor according to the invention on the one hand, but on the other hand to ensure a suitable delivery to the system areas to be fed It is proposed that the liquid storage / dispensing system comprise at least one main liquid reservoir and a liquid main line associated therewith and leading to a liquid reservoir. In this case, it can be provided, in particular, that the liquid intermediate line leads from the liquid intermediate store to at least one first liquid pump and at least one second liquid pump.

According to a further particularly advantageous aspect, it is proposed that at least one, preferably all, of the main liquid reservoirs can be filled and emptied via the associated main liquid lines. In particular, it may be provided that the liquid intermediate store is assigned a filling connection for filling at least one liquid main store in communication with it via the liquid intermediate store. In this way, the filling process, for example, as Druckbefüllvorgang is easy and fast to carry out.

Further, the soil compactor according to the invention is advantageously constructed with two compressor rolls, wherein each compacting roll is assigned a liquid discharge unit. According to a further very advantageous aspect, a liquid main memory can be arranged above each compressor roller, so that a uniform weight distribution in the soil compactor can be ensured.

If two compactor rolls are provided in the soil compacter constructed according to the invention, an edge processing device can advantageously be provided in association with each compacting mill. In order to be able to work on a road to be built in both side areas of the respective edge, it is further proposed that in this case the edge processing devices are provided on different sides of the soil compactor in the direction of the compressor roller axes of rotation. When moving the soil compactor in a first direction of travel can thus a first of the edge processing devices be used for editing a roadway edge. If the compressor moves in the opposite direction, then the edge processing device provided on its other side can be used to machine the other edge of the roadway.

Fig. 1

in prinzipartiger Seitenansicht einen Bodenverdichter mit zwei Verdichterwalzen an einem Maschinenrahmen;

Fig. 2

ein Flüssigkeits-Speicher/Abgabe-System für den in Fig. 1 dargestellten Bodenverdichter.

The present invention will be described below in detail with reference to the accompanying drawings. It shows:

Fig. 1

in principle side view of a soil compactor with two compressor rollers on a machine frame;

Fig. 2

a liquid storage / dispensing system for the in Fig. 1 shown soil compactor.

In Fig. 1 is an example used for compacting asphalt material for a roadway self-propelled soil compactor 10 in principle representation shown in side view. The soil compactor 10 includes a machine frame 12 formed, for example, as a hinged frame, on which two compressor rolls 14, 16 are rotatably supported about respective compressor roll rotation axes. The two compressor rollers 14, 16 are arranged on the machine frame 12 in a direction of movement of the soil compactor 10 consecutively. For example, one of them may be provided on a front end and one of them on a rear end of the machine frame. It should be noted in this context that for the purposes of the present invention, each of the compressor rolls 14, 16 may be constructed as a roll formed with a roll shell of steel material passing through the compressor roll rotational axis direction. However, one or both of the compressor rolls 14, 16 could in principle also be formed with a plurality of individual wheels following one another in the direction of the respective compressor roller rotation axis, for example with pneumatic tires, which in their entirety define a compactor roller in the sense of the present invention. In principle, however, could also each wheel of such a group of juxtaposed Wheels are considered as a compressor roller in the context of the present invention.

In the area between the two compressor rolls 14, 16, a driver's cab 18, for example a driver's cab, is provided on the machine frame 12. From the cab 18, an operator may control the soil compactor 10 during a work operation. In a region 20 under the driver's cab 18, the drive unit, ie for example a diesel drive unit, may be carried on the machine frame 12. About this drive unit, the various system areas to be driven of the soil compactor 10 with corresponding drive energy, for example via a pressurized fluid circuit, a generator / motor or the like can be fed.

The soil compactor 10 includes a liquid storage / dispensing system, generally designated 22. From this liquid storage / dispensing system, its structure and operation with reference to the following Fig. 2 described in detail are in Fig. 1 two liquid main tanks 24, 26 are visible, which are each supported on a compressor roller 14, 16 on the machine frame 12. Furthermore, in Fig. 1 schematically a liquid intermediate storage 28 recognizable, which is supported on the machine frame 12 in the area 20 under the driver's cab 18, ie in that area in which the drive unit can be accommodated. Furthermore, in Fig. 1 schematically from the liquid main memories 24, 26 to the intermediate liquid storage 28 leading liquid main lines 30, 32 recognizable. Via the liquid main lines 30, 32, the liquid contained in the liquid main memories 24, 26 can be delivered to the intermediate liquid storage 28 and then passed in the manner described below to be fed to liquid system areas of the soil compactor 10. These system areas include the two compressor rolls 14, 16, the surface of which, in particular, has to be wetted with liquid during an asphalt compacting operation in order to prevent the adhesion of asphalt material to the compacting rolls 14, 16 to avoid. Another with systemic fluid, so for example water, to be fed system area is in Fig. 1 shown in association with the compressor roller 14. This system area comprises an edge processing device 34, which is arranged laterally next to the compressor roller 14 and can be used for processing a roadway edge. This edge processing device 34 comprises an edge-machining wheel 38 that can be adjusted, for example, by a hydromechanical drive 36 in the vertical direction, which can be formed as a bevel gear and can press and beveled in contact with the roadway edge to be machined. The edge processing wheel 38 can be brought into a suitable height positioning and driven for rotation for performing such edge processing operation. The soil compactor 10 may include two such edgers 34, each on one side thereof, as viewed in the direction of the compressor roller axes of rotation. For example, it may be provided that the compressor roller 16 provided at the other end region of the machine frame 12 is also attached to the compressor roller 16 in FIG Fig. 1 unrecognizable side of the soil compactor 10 is associated with such a peripheral processing device, so that regardless of the orientation or of the direction of movement of the soil compactor 10 each have an edge region can be processed with the associated edge processing device.

Hereinafter, referring to the Fig. 2 the structure and operation of the liquid storage / dispensing system 22 described.

In Fig. 2 are the two main liquid storage 24, 26 can be seen, each in its upper region, for example by a closure 40, 42, z. B. screw lockable opening 41, 43 may have. These openings 41, 43 or the respective associated closure 40, 42 can serve on the one hand for venting the respective main liquid storage 24, 26 in a filling process, on the other hand could basically via these openings 41, 43 with each removed closure 40, 42 and a filling of the main liquid storage 24, 26 take place.

Is recognizable in Fig. 2 also the liquid main line 30 assigned to the main liquid storage 24, which leads from a lower region of the main liquid storage 24 to the liquid intermediate storage 28. In a corresponding manner, the liquid main line 32 assigned to the main liquid store 26 leads from a lower area of the main liquid store 26 to the intermediate liquid store 28. It can be seen that the two liquid main lines 30, 32 in an upper area of the liquid intermediate store 28 open into this. Since the intermediate liquid reservoir 28 is arranged below the two main liquid reservoirs 24, 26 in the vertical direction, it is ensured that the main liquid reservoirs 24, 26 can be completely emptied out to the liquid intermediate reservoir 28 via the liquid main lines 30, 32.

The intermediate liquid reservoir 28 is further associated with a filling connection 44 provided in a lower region at this. This filling connection 44, which is designed, for example, as an inclination angle connection or pressure pipe connection, preferably so-called C-pipe connection, can be used to fill the two main liquid reservoirs 24, 26 via the liquid intermediate store and the main liquid lines 30, 32 leading to it , This means that the liquid main line 30 or 32 assigned to a respective main liquid storage 24 or 26 can be used not only for emptying the main liquid storage 24 or 26, but also for filling it. Since the filling port 44 is constructed so that it is suitable for pressure filling, it is thus possible to fill the two main liquid storage parallel to each other in a very short time. The air displaced from the main liquid reservoirs 24, 26 can escape via the openings 41, 43 provided in the upper region of these main liquid reservoirs 24, 26 or the closures 40, 42 assigned to them and respective venting arrangements.

At the intermediate liquid reservoir 28, which may be formed, for example, of plastic material, preferably PE material, as a rotary injection molded part and fastened by Spanngurtbefestigung the machine frame 12, a closable by a closure 46 liquid discharge opening 45 is also provided. Via this liquid discharge opening 45, liquid contained in the main liquid reservoirs 24, 26 or the main liquid lines 30, 32 can be drained off. Furthermore, a liquid filter arrangement can be carried on the closure 46 closing off the liquid discharge opening 45, which can be designed as a screw closure, so that it can be easily removed from the liquid intermediate store 28 and cleaned when the closure 46 is removed.

At the intermediate liquid reservoir 28, a fluid delivery device 48, which is designed, for example, as a water tap, is furthermore provided. This can be used to make it possible for personnel working in the area of the soil compactor 10, for example, to clean their hands with the liquid stored in the liquid main storages 24, 26 or also in the liquid intermediate store 28.

The liquid buffer 28 may be further associated with a level sensing arrangement. The latter can, for example, operate in a pressure-dependent manner in the intermediate liquid reservoir 28, so that it can be concluded on the basis of the detected liquid pressure to what extent the liquid main reservoirs 24, 26 positioned above the liquid intermediate reservoir 28 are still filled with liquid.

In order to ensure that after carrying out a pressure filling operation via the filling connection 44 and removing a hose used for pressure filling and connected to the filling connection 44, the liquid contained in the liquid intermediate storage 28 or the liquid main storage 24, 26 does not recycle via the filling connection 44 The filling connection 44 preferably has a valve arrangement, preferably a non-return valve arrangement, which ensures only an inflow of liquid into the intermediate liquid reservoir 28, but prevents liquid from the intermediate liquid reservoir 28 from escaping through the filling connection 44. The draining off of liquid, as already explained above, can take place via the liquid discharge opening 45 closed by the closure 46.

From the lower region of the intermediate liquid reservoir 28, a liquid intermediate line 50 leads away to two first liquid pumps 52, 54 and a second liquid pump 56. These three liquid pumps 52, 54, 56 are connected in parallel to the liquid intermediate line 50 and thus take liquid in parallel from the liquid intermediate line 50 on. The first two fluid pumps 52, 54 are connected to each other in parallel to a first fluid discharge line 58. The first liquid discharge line 58 leads away from the first two liquid pumps 52, 54 and is branched into two first branch lines 60, 62. Each first branch line 60, 62 leads to a respective first liquid dispensing unit 64, 66. The first liquid dispensing unit 64 is associated with the compacting roller 14 and comprises a plurality of liquid in the direction of the compressor roller axis of rotation and in the conveying operation of the first liquid pumps 52, 54 liquid on the surface These may be provided on a distributor tube 70 positioned along the compressor roller 14, preferably along a stripper also associated with the compressor roller 14, the compressor roller 14. The sprayed through the liquid discharge nozzles 68 in a region above a scraper on the compressor roller 14 liquid is additionally distributed by the voltage applied to the surface of the compressor roller 14 scraper, so that a full-surface wetting of the compressor roller 14 is ensured with the output from the first liquid discharge unit 64 liquid ,

Likewise, the first liquid dispensing unit 66 is associated with the other compressor roller 16. This first liquid dispensing unit 66, which interacts with the compacting roller 16, also comprises a distributor tube 72, which preferably extends over one of the compactor roller 16 and has a plurality of liquid dispensing nozzles 74 provided thereon.

In the compression mode, the liquid contained in the main liquid reservoirs 24, 26 and gravitationally flowing into the liquid intermediate reservoir 28 via the liquid main lines 30, 32 can be withdrawn from the liquid intermediate reservoir 28 via one of the first liquid pumps 52, 54 and via the first liquid discharge line 58 and the first two branch pipes 60, 62 are conveyed to the first liquid discharge units 64, 66. In this case, the dimensioning of the first liquid pumps 52, 54 is selected such that each one of them has a sufficient delivery capacity in order to supply both liquid discharge units 64, 66 with sufficient liquid. The provision of two mutually parallel connected first fluid pumps 52, 54 ensures that in case of failure, one of the pumps can be continued immediately with the other, so that an interruption in the fluid supply to the two fluid delivery units 64, 66 can be avoided.

The second liquid pump 56, which likewise withdraws liquid from the liquid intermediate store 58 via the liquid intermediate line 50, discharges the liquid conveyed by the latter into a second liquid discharge line 76. The second liquid discharge line 76 branches into two second branch lines 78, 80. Each second branch line 78, 80 leads to a second liquid dispensing unit 82, 84, respectively. Each of these second liquid dispensing units 82, 84 may include one or more liquid dispensing nozzles 86, 88. Via the liquid dispensing nozzles 86, 88, the liquid conveyed by the second liquid pump 56 can be discharged in the direction of a respective edge processing device 34 or 34 ' become. For example, the liquid can be sprayed onto the respective edge-machining wheel 38 or 38 'of the edge-processing device 34 or 34', while it rotates about a rotation axis in the edge-machining process. As already mentioned above, each of these two edge processing devices 34, 34 'can each be assigned to one of the two compressor rollers 14, 16, advantageously distributed to the two sides of the soil compactor 10.

By means of the second liquid pump 56 connected in parallel to the first two liquid pumps 52, 54, liquid can be conveyed to the second liquid discharge units 82, 84, independently of the operation of the first liquid pump 52, with the required or advantageous amount. Since, in general, significantly less liquid has to be conveyed to the edge processing devices 34, 34 'in the edge processing operation than is required for the two compressor rollers 14, 16, the second liquid pump 56 can be designed with a lower maximum delivery rate, ie delivery volume per unit time The result is that, if during a edge processing operation, a liquid supply to the first two liquid dispensing units 64, 66 is not required, much less energy must be expended to promote liquid, since only a comparatively small dimensioned fluid pump, namely the second fluid pump 56, is to operate. Furthermore, the second liquid feed pump 56 can also be designed or activated for another conveying operation, for example an intermittent conveying operation.

In particular, when the liquid pumps 52, 54, 56 are arranged in the height direction below the liquid reservoir 28, to be able to empty the lying below the discharge port 45 line areas, for example, from the liquid intermediate line 50 and the lowest line area through a valve or a cock shut off connection 90 lead away, on which with the valve open or cock can drain the liquid. Antifreeze can also be fed into the line system via this connection 90 in order to convey it, for example, during a short delivery operation of the liquid pumps 52, 54, 56 to the various liquid discharge nozzles 68, 74, 86, 88. Thus, it can be ensured that at low ambient temperatures when decommissioning the soil compactor 10, for example overnight, the liquid still present in the region of the liquid discharge nozzles 68, 74, 86, 88 or the line regions leading therefrom does not freeze.

The foregoing with reference to the Fig. 1 and 2 described soil compactor 10 contains a variety of particularly advantageous in combination, but also individually positive impacting aspects. On the one hand, this provides the possibility of filling one or more main liquid reservoirs 24, 26 via a filling connection 44 assigned to them, in particular when carrying out a pressure filling operation, for which purpose the aspect that the main liquid lines 30, 32 are not only used for emptying the main liquid reservoir is utilized 24, 26, but also for filling the same can be used. Another very advantageous aspect of the ground compactor 10 according to the invention is that the various system areas to be supplied with liquid, generally water, in which there are different requirements with respect to the required amount of water, namely the compactor rolls 14, 16 on the one hand and the edge processing devices 34, 34 '. On the other hand, independently of each other by these system areas associated first liquid pumps 52, 54 and a second liquid pump 56 can be fed. Each of these system areas or each of these delivery pumps 52, 54, 56 can thus be constructed with optimum design aspects for the respective operation, in particular with a sufficient maximum delivery capacity, without any impairment in functionality in the liquid supply to a respective other system area brings.

It should be noted that the aspect that both main liquid reservoirs 24, 26 can be filled via a common filling connection 44 can also be realized if each main liquid store 24, 26 is assigned several, for example two, liquid main lines. From each main liquid storage 24, 26 could then lead, for example, a main liquid line to the liquid reservoir 28, while in each case a different main liquid line to the then, for example, not provided on the liquid reservoir 28 filling port 44 could lead, so that these liquid main main lines then the main liquid reservoir 24, 26 are filled together can.

Claims (6)

1. Soil compactor, comprising:

   - at least one compactor roller that can be rotated around a roller axis of rotation (14, 16),

   - at least one edge shaping device (34, 34'),

   - a fluid reservoir/delivery system (22) for storing and delivering fluid to at least one compactor roller (14, 16) and at least one edge shaping device (34, 34'),

   wherein the fluid reservoir/delivery system (22) comprises a first fluid pump (52, 54) for transporting fluid to at least one first fluid delivery unit (64, 66) associated to a compactor roller (14, 16) of the soil compactor and a second fluid pump (56) for transporting fluid to at least one second fluid delivery unit (82, 84) associated to an edge shaping unit (34, 34') of the soil compactor, wherein the second fluid pump (56) delivers fluid into a second fluid line (76) that leads to the at least one second fluid delivery unit (82, 84), characterized in that two first fluid pumps (52, 54) are provided for delivering fluid to the at least one first fluid delivery unit (64, 66) so that when one of the two first fluid pumps (52, 54) fails, fluid can still be delivered to the at least one first fluid delivery unit (64, 66) via the other first fluid pump (52, 54), and that the two first fluid pumps (52, 54) and the second fluid pump (56) absorb fluid from an intermediate fluid line (50) in parallel and that the two first fluid pumps (52, 54) deliver fluid to a first fluid delivery line (58) that leads to the at least one first fluid delivery unit (64, 66) in parallel.
2. Soil compactor according to claim 1,
   characterized in that the second fluid pump (56) has a lower maximum output than at least one of the two first fluid pumps (52, 54).
3. Soil compactor according to one of claims 1 to 2,
   characterized in that the fluid reservoir/delivery system (22) comprises at least one main fluid reservoir (24, 26) and a main fluid line (30, 32) associated to it that leads to an intermediate fluid reservoir (28).
4. Soil compactor according to claim 3,
   characterized in that the intermediate fluid line (50) leads from the intermediate fluid reservoir (28) to the two first fluid pumps (52, 54) and the second fluid pump (56).
5. Soil compactor according to claim 3 or 4,
   characterized in that:

   - at least one, preferably all main fluid reservoirs (24, 26) can be filled and drained via main fluid lines (30, 32) that are associated to them,
   and/or

   - a filling connection (44) is associated to the intermediate fluid reservoir (28) for filling at least one main fluid reservoir (24, 26) that is connected to it via the intermediate fluid reservoir (28),
   and/or

   - two compactor rollers (14, 16) are provided, a fluid delivery unit (64, 66) being associated to each compactor roller (14, 16) and/or a main fluid reservoir (24, 26) being arranged above each compactor roller (14, 16).
6. Soil compactor according to any of claims 1 to 5,
   characterized in that two compactor rollers (14, 16) are provided, an edge shaping device (34, 34') being provided in association to each compactor roller (14, 16), preferably on different sides of the compactor (10) in the direction of the compactor roller axes of rotation.

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