Robust and economically efficient room linear robot
The goal of development was to create a robust system that was easy to operate and could reproducibly dispense different volumes and viscosities at an appropriate speed with as much precision as possible. The system can be fitted out with four trays. The trays are manufactured to match the respective type of bottle. This makes it possible to fill any kind of receptacle and, if necessary, modify the system with minimum effort years later. The positioning accuracy is +/- one millimetre. At the present time, up to 1,400 bottles can be filled in one run through the system. The axis system positions the filling needles precisely in the neck of each bottle. The maximum travel speed is 300 m/s. "Previously, the entire process was carried out manually and tied up an employee", reports Ulf Niedergesäß. "It is not only the cost factor for an employee that counts but, also and above all, the quality. This is now ensured at all times, with the result that filling errors no longer occur. “
The lubrication-free room linear robot has a simple design. Two robust, horizontally aligned toothed belt axes of the type drylin® ZLW-0630 with a motor are used as the x axis. This is the appropriate solution for simple moving and positioning tasks in environments where space is restricted. The installation height is only 31 millimetres. Given a stroke length of 1,100 millimetres, of which the actual travel distance is 1,040 millimetres, the axis is a special design in terms of its length, which is normally a maximum of 1,000 millimetres. "Here, we received a flexible response to our wishes based on reliable calculations regarding the overall solution", confirms Ulf Niedergesäß. For the y direction, two 600 millimetre long, mechanically coupled, side-mounted parallel axes of the size ZLW-0630 are used. A drylin® GRQ toothed rack axis was chosen as the z axis for the dispensing module. The stroke is 240 millimetres, which is made use of over the entire height and, when necessary, can be scaled to meet other requirements at any time. This increases the flexibility of the entire system. "It is a robust, compact and economically efficient solution that performs its positioning tasks fully and precisely", says Ulf Niedergesäß in clarification. Another benefit is the quiet operation of the axes. "This was yet another thing that convinced us", confirmed the design engineer.
The accessories are also important for the filling system. The motors are stepper motors of the sizes NEMA 11, 17 and 23 with optical incremental encoders in the closed-loop control circuit. Precision inductive proximity switches were chosen as the end switches. Further igus® products such as chainflex® motor cables and plastic energy chains of the E2 series were also used in the project. "We offer a cost-effective, ready-to-connect linear robot system that is derived from the modular system and can be ordered immediately via the catalogue", explains the responsible igus® sales consultant, Benjamin Neumann. "Solutions for automation tasks where highly precise movements are not necessarily required can thus be created quickly and effectively. “