APPARATUS FOR CLEANING SURFACES

Abstract

The present invention relates to an apparatus for cleaning a surface, in particular at solar collectors or photovoltaic installations. The apparatus has at least one cleaning head that comprises at least one cleaning member. The cleaning member is in particular a brush that can be set into rotation. The apparatus furthermore has a movement device for moving the cleaning head over at least a part of the surface to be cleaned. The movement device has a first movement unit movable in a first direction and a second movement unit. The cleaning head is movable transversely or obliquely to the first movement direction by means of the second movement unit along a guide means that is connected to the first movement unit. A control means that is arranged at the first and/or second movement units makes it possible to automatically move the first movement unit in dependence on a position of the second movement unit.

Claims

1. An apparatus for cleaning a surface (12), in particular at solar collectors or photovoltaic installations, having at least one cleaning head (20) that has at least one cleaning member (24), in particular a brush that can be set into rotation, and having a movement device for moving the cleaning head (20) over at least a part of the surface (12) to be cleaned, wherein the movement device has a first movement unit (16, 16′) movable in a first movement direction (R1) and a second movement unit (22), wherein the cleaning head (20) is movable transversely or obliquely to the first movement direction (R1) by means of the second movement unit (22) along a guide means (30) that is connected to the first movement unit (16, 16′), and wherein a control means is provided which is arranged at the first and/or second movement units (16, 16′ or 22) and by which the first movement unit (16, 16′) is automatically movable in dependence on a position of the second movement unit (22).

2. An apparatus in accordance with claim 1, characterized in that the control means has a proximity and/or contact switch or a corresponding sensor that effects a drive of the first movement unit (16, 16′) on an approach and/or on a contact of the movement units (16, 16′, 22).

3. An apparatus in accordance with claim 1 or claim 2, characterized in that the control means comprises a mechanical drive device (36) which is provided at the second movement unit (22) and with which the first movement unit (16, 16′) is drivable to make the movement in the first movement direction (R1) on a contact of the movement units (16, 16′, 22).

4. An apparatus in accordance with claim 3, characterized in that the drive device (38) is drive effectively coupled to a drive of the second movement unit.

5. An apparatus in accordance with claim 4, characterized in that the drive device comprises a gear (38) that is in engagement with a drive element, in particular a gear (40), of a drive of the first movement unit (16, 16′) on a contact of the movement units (16, 16′, 22).

6. An apparatus in accordance with at least one of the preceding claims, characterized in that the control means comprises a controlling means with which a drive of the first movement unit (16, 16′) can be interrupted with a time delay and/or after the traveling of a predefined distance.

7. An apparatus in accordance with at least one of the preceding claims, characterized in that the control means is configured such that a reversal of a drive of the second movement unit (22) can be effected with a time delay and/or after the traveling of a predefined distance.

8. An apparatus in accordance with at least one of the preceding claims, characterized in that the cleaning head (20) is arranged at the second movement unit (22).

9. An apparatus in accordance with claim 8, characterized in that an element (27) of the second movement unit (22) cooperating with the guide means (30) is pivotable relative to a base (25) of the second movement unit (22) carrying the cleaning head (20).

10. An apparatus in accordance with at least one of the preceding claims, characterized in that the first and/or second movement units (16, 16′ or 22) is/are electrically, hydraulically and/or pneumatically driven.

11. An apparatus in accordance with at least one of the preceding claims, characterized in that the cleaning member (24) is movable by means of an electric, hydraulic and/or pneumatic drive (26).

12. An apparatus in accordance with at least one of the preceding claims, characterized in that the apparatus comprises an energy store and/or a photovoltaic unit that is/are coupled to a drive of the first and/or second movement units (16, 16′ or 22) and/or to a drive of the cleaning member (24).

13. An apparatus in accordance with at least one of the preceding claims, characterized in that the guide means (30) is pivotable relative to the first movement unit (16, 16′).

14. An apparatus in accordance with at least one of the preceding claims, characterized in that the guide means (30) is length variable.

15. An apparatus in accordance with at least one of the preceding claims, characterized in that the guide means is a cable (30) or a ribbon.

16. An apparatus in accordance with at least one of the preceding claims, characterized in that a third movement unit (16′) is provided that is movable in a third direction (R3) that in particular extends in parallel with the first direction (R1) and that is connected to the guide means (30), with a further control means being provided which is arranged at the third and/or at the second movement unit (16′ or 22) and with which the third movement unit (16′) is automatically movable in dependence on a position of the second movement unit (22).

17. An apparatus in accordance with at least one of the preceding claims, characterized in that the first and/or—if present—the third movement unit (16, 16′) is provided with a holding device (46, 48) that is configured to engage around a component, in particular a frame (14), of the solar collectors or photovoltaic installation in a state arranged at the solar collectors or photovoltaic installation and to permit a limited tiltability of the movement unit (16, 16′).

18. A system having solar collectors or a photovoltaic installation and having an apparatus in accordance with at least one of the preceding claims.

19. A system in accordance with claim 18, characterized in that the first and/or—if present—the third movement unit (16, 16′) is guided along a frame (14), in particular an outer frame, of the surface (12) to be cleaned, in particular on the frame (14), with in particular the frame (14) being an outer framing, an outer boundary and/or an outer enclosure of the respective surface (12) to be cleaned, and/or the frame (14) being a component of the solar collectors or photovoltaic installation.

Description

[0027] The present invention will be described in the following by way of example with reference to an advantageous embodiment and to the enclosed drawings. There are shown:

[0028] FIG. 1 an embodiment of a cleaning apparatus in accordance with the invention in a schematic representation; and

[0029] FIG. 2 the apparatus of FIG. 1 in different operating states.

[0030] FIG. 1 schematically shows a cleaning apparatus 10 in accordance with the invention at a surface to be cleaned that belongs, for example to solar collectors or to a photovoltaic installation.

[0031] The surface 12 is bounded by a frame 14. The cleaning apparatus 10 comprises two wagons 16, 16′ that are arranged at the longitudinal sides of the frame 14. The wagons 16, 16′ each have a plurality of rollers 18 by means of which the wagons 16, 16′ are guided in a travelable manner at the frame 14.

[0032] A cleaning head 20 of the apparatus 10 is arranged at a carriage 22. The cleaning head 20 comprises two cleaning rolls 24 that can be driven with the aid of a motor 26 via a belt 28 to make rotary movements to clean the surface 12. The rolls 24 are held by a carrier frame-like base 25 of the carriage 22 and the base also carries a guide element 27 supported pivotably with respect to the base 25. The structure and the function of the guides 27 will be explained more precisely in the following.

[0033] As was already initially mentioned, it is important for an efficient operation of solar collectors or photovoltaic installations to regularly clean the corresponding collector surfaces. This should take place automatically where possible to keep the operating costs of the installation low. I.e. the interventions required by an operator for the cleaning of the surfaces 12 should be as minimal as possible.

[0034] To be able to clean the surface 12 step-wise and with a minimum use of staff, not only the wagons 16, 16′ are movable, but the carriage 22 can also be traveled. It is travelable along a cable 30 (movement direction R2) that is connected to both wagons 16, 16′. The cable 30 cooperates with a roller 32 of the guide element 27. It loops around the roller 32 so that a rotation of the roller 32 results in a travel of the carriage 22. A drive of the roller 32 is not shown in FIG. 1. It is, however, also arranged at the carriage 22.

[0035] The roller 32 is rotationally fixedly coupled to a coaxially arranged roller 34 that is in turn drive-effectively connected to gears 38 via a belt 36. I.e. not only a movement of the carriage 22 along the cable 30 guiding the movement of the carriage 22 is effected by a drive of the roller 32 to make a rotary movement, but a rotary movement of the gears 38 is also generated.

[0036] If the carriage 22—unlike as shown in FIG. 1—is located in a region between the wagons 16, 16′, the rotation of the gears 38 has no particular effect. The carriage 22 is guided at the desired speed over the surface 12 by the rotary movement of the roller 32, with the cleaning rolls 24 of the cleaning head 20 carrying out their cleaning work. It is conceivable to decouple the roller 34 from the roller 32 in this situation.

[0037] As soon as the carriage 22 comes into contact with one of the wagons 16, 16′, however, the drive of the gears 38 effects a movement of the corresponding wagon 16, 16′. This will be described in the following with reference to the situation shown in FIG. 1 in which the carriage 22 has reached the upper end of its “pendulum movement” between the wagons 16, 16′. The carriage 22 has in this respect approached the wagon 16 so much that the upper gear 38 comes into engagement with a gear 40 that is in drive-effective connection with the rollers 18 via gears 42 and via gears 44 acting as idler gears. A rotary drive movement generated by the drive of the carriage 22 is thus transmitted to the rollers 18, whereby the wagon 16 is traveled on the frame 14. Provision can be made that the roller 32 is actively or passively decoupled from the drive in this state and only the roller 34 is driven.

[0038] FIG. 2 shows the process of a step-wise cleaning of the surface 12. The situation represented in FIG. 1 is shown in FIG. 2A. FIG. 2B shows the situation that is adopted after a lateral travel of the wagon 16 on the frame 14 that was effected in the above-described manner. The distance by which the wagon 16 was traveled to the right can be fixed, for example, in that the direction of rotation of the drive of the carriage 22 is reversed after a predetermined time and—if it was decoupled at times—the roller 32 is again drive effectively connected to the drive associated with it. The carriage 22 then moves away from the wagon 16, whereby the gears 38 and 40 are brought out of engagement. The wagon 16 then stops, either by the inner friction of the mechanism of the wagon 16 and/or with the aid of holding or braking means.

[0039] The lower carriage 16′ has not moved on in the meantime so that the cable 30 is now tensioned obliquely over the surface 12. An accompanying extension of the cable 30 can be permitted by a corresponding configuration of a connection 39 (see FIG. 1) of the cable 30 to the wagon 16 and/or to the wagon 16′. The guide element 27 was pivoted relative to the base 25 by the cable 30 so that the orientation of the base 25 is substantially unchanged.

[0040] As can be seen in FIG. 2C, the carriage 22 is subsequently moved downwardly until it comes into contact with the wagon 16′. The lower gear 38 then drives the wagon 16′ (in an analog manner to the upper gear 38 driving the wagon 16) to make a movement to the right (movement R3) until the state shown in FIG. 2D is reached and the carriage 22 is again set into motion and is traveled along the cable 30 to the wagon 16.

[0041] The above-described movement scheme can naturally also be worked through in a reverse direction.

[0042] The cleaning apparatus 10 only needs a drive, namely the roller 32, for the movement of the carriage 22 over the surface 12. This drive can be an electric drive, for example. To minimize an external power supply or even to make it obsolete, the apparatus 10 can have its own photovoltaic installation as well as a suitable energy store associated with it. The two named components are in particular arranged at the carriage 22 and/or at the wagons 16, 16′.

[0043] Differing from the described embodiment of the cleaning apparatus 10, provision can be made that the cleaning rolls 24 are also driven by the drive of the roller 32. It is, for example, advantageous if the drive is a hydraulic drive. The water used in this respect can be applied over the surface 12 via suitable nozzles after its use as a drive means to improve the cleaning effect of the apparatus 10.

[0044] Instead of the cable 30 a rod (optionally a telescopic rod) can also be provided along which the carriage 22 moves, for example with the aid of roller pair gripping around the rod from two sides.

[0045] It can be advantageous in certain applications to have the wagons 16, 16′ associated with their own drives that are activated as soon as the carriage 22 is located in a predefined position. The activation can take place by proximity switches and/or contact switches or by suitable sensors. It is, for example, conceivable that such a contact switch establishes an electrical contact between an energy supply of the drive of the carriage 22 and the respective drive of the wagons 16, 16′. In this case, the wagons 16, 16′ do not require their own power supply.

[0046] In an embodiment, not shown, of the cleaning apparatus in accordance with the invention, only one wagon 16 or 16′ can also be provided that is e.g. connected to a rigid guide means (e.g. to a rod). The carriage 22 having the cleaning head 20 then travels to and fro along this guide means, with said carriage effecting the movement of the wagon 16 or 16′ respectively when it reaches it, such as has been described above in different variants. On a reaching of the other end of the guide means, a reversal of the movement of the carriage 22 can be effected by suitable proximity switches and/or contact switches or sensors provided there. This end of the guide means is advantageously guided and/or supported by its own guide device in the region of the frame 14 (or by the frame 14 itself) in this embodiment. The guide means can also be supported on the surface 12, for example by means of a roller.

[0047] As already briefly mentioned above, means—e.g. holding means or braking means— can be provided that ensure that the wagons 16, 16′ each remain in their position when they should actually not move along the frame 14, that is in particular when the carriage 22 moves between the wagons 16, 16′ to carry out its cleaning work and a movement of the wagons 16, 16′ would be a disadvantage.

[0048] Such securing means can e.g. be formed by a rubber coating 18 of the rollers 18 that is configured as correspondingly soft or compressible so that the rollers 18 require a specific force or a specific torque to be set into movement that is only applied when the carriage 22 cooperates with the respective wagon 16 or 16′ for this purpose. Alternatively or additionally, a targeted stiffness and/or a latching of the rollers 18 can be provided to provide a threshold to be overcome.

[0049] Detail A in FIG. 1 shows a further possibility. Beams 46 of the respective wagon 16, 16′ and disks 48 of the rollers 18 together form a holding device engaging around the frame 14. The wagon is tiltable to a certain degree on the frame 14, as is indicated by the double arrow. A section of the beam 48 configured as a brake show 49 moves into or out of rubbing or adhering engagement with the surface 12 to be cleaned depending on whether the cable 30 is subjected to tension or not with respect to the wagon 16, 16′. The movement of the carriage 22 then therefore itself automatically ensures that the wagon 16, 16′ is either braked or movable.

[0050] The beams 48 can alternatively or additionally also serve as carriers for—mechanical, electrical and/or optical—sensors, not shown, for the end position recognition by means of which the apparatus can recognize the reaching of an end of the surface 12 to be cleaned—viewed in the respective movement direction of the wagons 16, 16′. Such sensors can alternatively or additionally also be arranged at different positions, e.g. at lateral projections 50 of the carriage 22.

[0051] The apparatus can be configured such that a direction reversal of the carriage 22 takes place automatically.

[0052] Alternatively, a switching device can be provided for the user. It can be configured as a pulse control and in particular such that a switching process is triggered at the carriage by a switching on and off of the supply of e.g. water that is supplied at pressure to the carriage 22, for example via a pressure washer to which the apparatus is connected. A switching process can also be controlled electrically, e.g. by means of one or more servo motors that are e.g. controlled via an electric line or wirelessly or are triggered mechanically via a load cable guided in parallel with a water hose between the user and the carriage 22 and to be actuated manually.

[0053] A valve manifold can e.g. be connected to the carriage 22 in a respective desired working state by means of such switching processes so that, for example, either a first impeller effecting a first movement direction of the carriage 22 or a second impeller effecting an opposite second movement direction of the carriage 22 is selectively acted on in a drive-effective manner by pressurized water via the valve manifold. These impellers can e.g. be formed by the roller 22 (FIG. 1) and can be arranged along the axis of rotation of the roller 22 at a spacing from one another.

REFERENCE NUMERAL LIST

[0054] 10 cleaning apparatus [0055] 12 surface [0056] 14 frame [0057] 16, 16′ wagon [0058] 18 roller [0059] 18a rubber coating [0060] 20 cleaning head [0061] 22 carriage [0062] 24 cleaning roll [0063] 25 base [0064] 26 motor [0065] 27 guide element [0066] 28, 36 belt [0067] 30 cable [0068] 32, 34 roller [0069] 38, 40, 42, 44 gear [0070] 46 beam [0071] 48 disk [0072] 49 brake shoe [0073] 50 projection [0074] A detail [0075] R1, R2, R3 movement device