Method for operating a construction-material and/or viscous-material pump for conveying construction material and/or viscous material, and construction-material and/or viscous-material pump for conveying construction material and/or viscous material

A method for operating a construction material and/or thick matter pump for conveying construction material and/or thick matter, wherein

• the construction material and/or thick matter pump comprises:
• a conveying cylinder being configured to receive and discharge the construction material and/or thick matter, and
• a conveying piston, the conveying piston being arranged movably in the conveying cylinder in order to take in the construction material and/or thick matter into the conveying cylinder and in order to displace taken-in construction material and/or thick matter out of the conveying cylinder,
• the method comprising:
• conveying the construction material and/or thick matter by movement of the conveying piston in order to take in and displace the construction material and/or thick matter;
• detecting a position variable during the movement, the position variable characterizing a position of the conveying piston along a conveying piston stroke in the conveying cylinder;
• detecting a conveying variable during the movement, the conveying variable being distinct from the position variable and representing a value of a pressure acting on the construction material and/or thick matter in the conveying cylinder;
• determining a displacement start position, at which the conveying piston starts to displace the taken-in construction material and/or thick matter out of the conveying cylinder, by correlating the detected position variable during the movement for the displacement and the detected conveying variable during the movement for the displacement, with one another, wherein the displacement start position is determined as the position of the conveying piston at which the pressure and/or a chronological increase the pressure reaches or overshoots a specified limit value;
• adapting a profile for a subsequent movement of the conveying piston based on the determined displacement start position, by:
• (a) decreasing a speed and/or increasing a standstill duration of a profile from a preceding intake to a subsequent intake until the displacement start position no longer approaches an intake end position, or
• (b) increasing the speed and/or decreasing the standstill duration of the profile from the preceding intake to the subsequent intake until the displacement start position moves away from the intake end position;
• and
• controlling the subsequent movement in accordance with the adapted profile.