AN UNMANNED VEHICLE FOR DISPLACING MANURE

Abstract: The invention relates to an unmanned vehicle for displacing manure over a stable floor, comprising a steering unit for steering the vehicle and a frame (1) and first, second and third supporting means for supporting the frame on the floor, the first and second supporting means being rollable relative to the floor and the third supporting means comprising manure displacing means for displacing manure, while the first supporting means comprise a propelling unit (2) for propelling the vehicle, said propelling unit comprising two independently driven propelling members and the steering unit being constituted by the propelling unit.

Description: AN UNMANNED VEHICLE FOR DISPLACING MANURE The invention relates to an unmanned vehicle according to the preamble of claim 1. In modern stables there is usually applied a stable floor in which there are provided apertures for letting through cow manure. Under the stable floor there is provided a receptacle in which the manure passed through is collected. Generally there is provided in the stable a so-called manure slide which moves through the stable at fixed points of time and displaces the manure partially to the dung pit and partially through the apertures in the stable floor. A new development is an unmanned vehicle for displacing manure. Such an implement is known from e.g. Messrs. Joz B.V. as the JOZTECH (Landbouw Rai (Agricultural Rai), Amsterdam, January 1999). This implement is provided with a first propelling unit comprising two freely rotatable wheels and a second propelling unit comprising one driven and controllable wheel. The disadvantage of said implement is that the construction of the driven and controllable wheel is complicated and therefore expensive. Moreover, the construction is very sensitive to dirt, which is not desirable in the stable environment. Finally, the JOZTECH is driven by only one controllable wheel, so that wheel skidding often occurs on the stable floor which is very slippery due to the presence of manure. As a result thereof it is not possible to determine the exact position of the vehicle on the basis of the number of revolutions of the driven wheel. The invention aims at obviating the above-mentioned drawbacks by means of an unmanned vehicle according to the characterizing part of claim 1. The advantage of this unmanned vehicle is that the drive unit of the propelling members also constitutes the steering unit of the unmanned vehicle. Accordingly, there is achieved a compact construction which is insensitive to dirt and which, besides, is less complicated, so that lower manufacture costs are involved. According to a further inventive feature, at least one of the supporting means is provided with pressure setting means for setting the pressure with which the manure displacing means press on the floor. Therefore, the invention relates to an unmanned vehicle for displacing manure over a stable floor, comprising a steering unit for steering the vehicle and a frame with first, second and third supporting means for supporting the frame on the floor, while the first and second supporting means are rollable relative to the floor and the third supporting means comprise manure displacing means for displacing manure, the first supporting means comprising a propelling unit for propelling the vehicle, characterized in that at least one of the supporting means is provided with pressure setting means for setting the pressure with which the manure displacing means press on the floor. The second propelling unit comprises at least one freely rotatable propelling member. The propelling members are preferably designed as a wheel and/or a caterpillar track. In a preferred embodiment the rotatable propelling member consists of a castor wheel as a result of which the unmanned vehicle has an excellent manoeuvrability. Caterpillar tracks have the advantage of being less sensitive to skidding than wheels. In accordance with another inventive feature, the unmanned vehicle is equipped with orientation means for following a path in a space, or determining the position of the vehicle in a space, such as a stable or a meadow. The orientation means comprise floor detection means for detecting apertures in the floor and/or detecting a guide means in the floor, such as the reinforcement in the concrete or an electricity conducting wire. The apertures in the floor are usually provided for removing the manure as described above. When the stable floor is made of concrete, there is usually applied a metal grid in the floor for giving it extra strength. Said grid can be detected by means of the floor detection means with the aid of e.g. an induction coil. Additional orientation means may comprise a compass and/or a gyroscope and/or a spirit level and/or a clinometer and/or an acceleration meter. These orientation means are nowadays available in a form which is suitable for being applied in electronic circuits, so that integrated orientation means can easily be composed from the various components. Besides, the orientation means also comprise wall following means for detecting and following a wall, such as a fixed stable wall or the edge of a cubicle. These wall following means extend over at least part of the circumference of the unmanned vehicle. The wall following means may also be disposed on the manure displacing means. In a preferred embodiment, the wall following means consist of a freely rotating substantially round element, such as preferably a wheel and/or a disc and/or a sphere. According to another inventive feature, the unmanned vehicle is equipped with protective facilities for protecting the vehicle against obstacles, such as cows' legs, or fixed objects, such as supporting pillars in the stable. The protective facilities may comprise a bumper and/or a sensor for detecting cows. The protective facilities may also comprise wall following means. The protective facilities may also comprise positioning means for determining the position of an obstacle relative to the unmanned vehicle. The positioning means may also comprise a clinometer and/or an acceleration meter. The positioning means are preferably disposed on the wall following means. In this manner it is possible to determine the angular deflection and angular acceleration of e.g. the wall following means, so that information is obtained regarding the position of the obstacle. The signal from the positioning means is used for actuating the steering unit. The manure displacing means preferably comprise at least one brush and/or at least one manure slide and/or at least one spraying unit. In accordance with a last inventive feature, the unmanned vehicle is equipped with anti-bumping means for preventing the manure displacing means from moving too far away from the floor. The anti-bumping means comprise a bumper and/or a bracket. The anti-bumping means preferably comprise an anti-bumping sensor for detecting the movement of the manure displacing means away from the floor, which anti- bumping sensor is coupled to the propelling unit. Such an anti-bumping sensor may consist of a switch which is disposed on the bumper or bracket. When the manure slide moves too far away from the stable floor, the switch touches the stable floor, whereupon the unmanned vehicle is caused to run in an opposite direction and bears again with all its supporting means on the stable floor. The invention will now be explained in further detail with reference to the accompanying drawing, in which Figure 1 is a plan view of the unmanned vehicle. The unmanned vehicle as shown in Figure 1 consists of a frame 1 to which there are fitted a castor wheel 5, the propelling unit 2 and the manure slide 3. The steering unit is constituted by the propelling unit 2, which propelling unit 2 comprises two independently driven wheels 4. In this embodiment manoeuvring the vehicle is possible by varying the drive torque or the peripheral velocity of the wheels 4. The wheels 4 may comprise a wheel and/or a caterpillar track.

Claims: CLAIMS 1. An unmanned vehicle for displacing manure over a stable floor, comprising a steering unit for steering the vehicle and a frame (1) with first, second and third supporting means for supporting the frame (1) on the floor, while the first and second supporting means are rollable relative to the floor and the third supporting means comprise manure displacing means for displacing manure, the first supporting means comprising a propelling unit (2) for propelling the vehicle, characterized in that the propelling unit comprises two independently drivable propelling members and the steering unit is constituted by the propelling unit. 2. An unmanned vehicle as claimed in claim 1, characterized in that at least one of the supporting means is provided with pressure setting means for setting the pressure with which the manure displacing means press on the floor. 3. An unmanned vehicle for displacing manure over a stable floor, comprising a steering unit for steering the vehicle and a frame (1) with first, second and third supporting means for supporting the frame (1) on the floor, while the first and second supporting means are rollable relative to the floor and the third supporting means comprise manure displacing means for displacing manure, the first supporting means comprising a propelling unit (2) for propelling the vehicle, characterized in that at least one of the supporting means is provided with pressure setting means for setting the pressure with which the manure displacing means press on the floor. 4. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the second supporting means comprise at least one freely rotatable propelling member. 5. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the propelling member comprises a wheel (4) and/or a caterpillar track. 6. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the second supporting means are disposed between the first and the third supporting means . 7. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the unmanned vehicle is equipped with orientation means for following a path in a space or determining the position of the vehicle in a space, such as a stable or a meadow. 8. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the unmanned vehicle is equipped with protective facilities for protecting the vehicle against obstacles, such as a cow's leg. 9. An unmanned vehicle as claimed in claim 8, characterized in that the protective means are provided equipped with positioning means for determining the position of an obstacle relative to the unmanned vehicle. 10. An unmanned vehicle as claimed in claim 9, characterized in that the signal from the positioning means is used for actuating the steering unit. 11. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the manure displacing means comprise at least one brush and/or at least one manure slide (3) and/or at least one spraying unit. 12. An unmanned vehicle as claimed in any one of the preceding claims, characterized in that the unmanned vehicle is equipped with anti-bumping means for preventing the manure displacing means from moving too far away from the floor.

Inventors: VAN DEN BERG KAREL, VAN DEN BERG, KAREL
Applicants: BERG KAREL VAN DEN, LELY RES HOLDING, LELY RESEARCH HOLDING AG, VAN DEN BERG, KAREL
Application year: 2000
Main classification: A01K1
IPC codes: A01K1