In a first aspect, the invention relates to a drive for intermittently driving a conveyor belt, the conveyor belt partially surrounding a drum rotatable about a central axis, the drive means comprising a drive member and a motion transmitting member.
In a second aspect, the invention relates to a method of driving such a conveyor belt.
Conveyor belts of the type described can be used in many different applications. Such applications are, for example, the rearing of livestock, such as the breeding of cattle and pigs. In such applications, it has previously been known to utilize a movable floor to form a livestock rearing space that includes such a conveyor belt for use in removing feces and/or supplying feed. Therefore, in this application, the conveyor belt has a considerable width and is driven slowly and intermittently. A conveyor belt for this use is disclosed, for example, in WO 02/071836.
In many cases, the belt passing through the drum exhibits a tendency to move laterally/laterally along the drum. Sometimes a lot of force is needed to counteract this trend and keep the belt in place. If the conveyor belt is very wide and is made of steel as in the above applications, it may be particularly difficult to counteract the tendency to move and hold the belt in place. The measures for holding the conveyor belt in this way are costly and cause frictional losses and belt wear. Another possibility is to rotate the drums in opposite directions at regular intervals to allow the belt to move laterally backwards. However, the disadvantage is that the conveyor belt will also be dragged backwards in the conveying direction.
In this case, it is an object of the present invention to provide a driving device for a conveyor belt of the type described, and a method of driving such a conveyor belt, which can correct the lateral position of the conveyor belt on the drum without The defects indicated above appear
Summary of the invention
In a first aspect of the invention, the set object has been achieved by a drive device defined by the preamble of claim 1 and comprising a feature drive member arranged to perform a reciprocating motion; the motion transmitting member is The movement of the driving member in the first direction is arranged to rotate the roller in the first rotational direction and to move the conveyor belt; the motion transmitting member is arranged in the movement of the driving member in the second direction such that the roller is in the case of the conveyor belt being stationary The second direction of rotation rotates.
By thus reciprocating the drum, it is possible to correct the possible lateral movement of the conveyor belt during each return stroke. Since the conveyor belt remains stationary during the return movement of the drum, the (conveyor belt) can remain in one-way motion, thereby avoiding the rearward conveyance of the article. Since the driving device thus achieves the functions of driving the conveyor belt in the desired conveying direction and providing correction for the lateral movement, the cost is greatly reduced compared to the provision of the separate driving device and the correction device.
According to a preferred embodiment of the drive device of the invention, the degree of rotational movement of the drum in both directions of rotation is substantially (substantially) equal. Thereby, the best correction effect on the lateral movement is achieved.
According to another preferred embodiment, the drive member comprises a pressure actuated telescoping tube (corrugated tube, air duct) and a mechanical spring. This achieves the reciprocating movement of the drive member in a very simple and convenient manner. The number of active parts of the drive is minimized and becomes sturdy and less susceptible to interference. For example, the telescoping tube can be made into a woven hose similar to a fire hose, and the tension spring can be arranged in parallel with the telescopic tube. Of course, as an alternative, a compression spring can be used. In addition, the telescoping tube itself can be resilient so that no additional springs are needed.
According to a further preferred embodiment, the motion transmitting member comprises an arm connected to the driving member, a pressure member connected to the arm, a neck member disposed on at least one end surface of the drum, the arm being rotatably mounted on the neck shape a carrier mounted on the end face,
The arm is arranged to first move the pressure member against the conveyor belt as the drive member moves in the first direction, and then cause the conveyor belt to perform the movement by the adjacent pressure member while the roller edge is advanced by the neck member and the pressure member The first rotational direction is rotated, and the arm is arranged to first move the pressure member when the drive member moves in the second direction such that it no longer abuts the conveyor belt and abuts the carrier member, and then passes through the carrier member and the neck shape And rotating the drum in the second rotational direction.
This shaped motion transmission member provides the described motion pattern with very few moving parts and simple cooperation between the moving parts. This reduces the manufacturing and maintenance costs of the device. This simplicity also makes the device highly operationally reliable even in dusty environments where it is often possible.
According to a further preferred embodiment, the carrier and the connection of the drive member and the arm are located on one side of a plane passing through the central axis of the drum, while the neck and pressure member are located on the other side/opposite side. In this way, the force can be effectively transmitted by leverage.
According to a further preferred embodiment, the pressure member is rod-shaped, parallel to the drum and extends along a majority of the length of the drum. Due to this extension in the longitudinal direction, the force is distributed over a large area, thereby avoiding the concentration of the load and avoiding the inclination of the direction of the force.
According to a further advantageous embodiment, the drive is controlled such that it is alternately in an inactive state with a long duration and an active state with a short duration, wherein the drive is inactive when the drive is idle, when the drive The piece is active when it performs some itinerary. Thus, the invention can be advantageously applied to applications where material transport is only required for certain short periods of time.
According to another preferred embodiment, the conveyor belt is a movable floor of the livestock breeding unit. The invention is primarily used for such applications where the advantages of the invention are very valuable.
The above described preferred embodiment of the drive device of the invention is defined in the dependent claims of claim 1.
In a second aspect of the invention, the set object has been achieved by a method defined by the preamble of claim 9 and comprising the feature of driving while alternately performing the first phase and the second phase In the first stage, the drum moves in the first rotational direction while the conveyor belt moves; in the second phase, the drum moves in the second rotational direction while the conveyor belt remains stationary.
According to a preferred embodiment of the method of the invention, the method is implemented by means of the drive device of the invention, in particular by means of any preferred embodiment of the drive device of the invention.
Correspondingly, the corresponding types of advantages already described above with regard to the drive device of the invention are achieved.
The invention will be apparent from the following detailed description of the preferred embodiments of the invention.