| 摘要 |
Eccentric loading errors of a weighing cell (1) with a parallel guiding mechanism are determined and corrected or at least reduced. The weighing cell has a test weight actuating device (14), by which at least one test weight (15) is positioned successively on at least three test weight support points (16, 17, 18, 19, 20) of the test load receiver (4) that do not lie in a straight line. A processor unit (21) uses a control signal (S1) to position the test weight on the support points. A test weighing signal (T) is generated for each support point, and from these, eccentric loading errors are ascertained. A device for correcting the eccentric loading errors uses control signals (S2) from the processor unit to make a geometrical-mechanical change in the parallel guiding mechanism, using a first and a second actuating unit. |
| 主权项 |
1. A cell for weighing a load on a weighing load receiver, the cell having weighing electronics associated therewith and a vertical load application axis, the cell comprising:
a parallel guiding mechanism which comprises:
a movable parallelogram leg connected to the weighing load receiver;a test load receiver, connected to the movable parallelogram leg, the test load receiver having at least three test weight support points, not in a straight line;a stationary parallelogram leg, connected to a supporting basic structure; andat least two parallel-guiding members, which connect the parallelogram legs by bearing points; a test weight actuating device, arranged to position at least one test weight successively at the at least three test weight support points, wherein:
the test weight actuating device displaces the at least one test weight horizontally in a sliding manner from a parking position onto the test load receiver;the test load receiver moves the at least one test weight into the at least three test weight support points along a linear displacement path on the test load receiver and by carousel-like rotation of the test load receiver, the at least one test weight continuously loading the test load receiver on the displacement path and during the intermediate stops in the test weight support points; andthe test weight actuating device displaces the at least one test weight back into the parking position, where the at least one test weight is decoupled from test load receiver; a processor unit, configured for generating control signals for the test weight actuating device, to control the positioning of the at least one test weight on the test weight support points and to receive, from the weighing electronics, a test weighing signal associated with each test weight support point concerned and also configured to ascertain eccentric loading errors of the weighing cell on the basis of the received test weighing signals, and a device for acting upon the ascertained eccentric loading errors, comprising at least a first and a second motor-operated actuating unit controlled by additional control signals from the processor unit, to generate a geometrical-mechanical change in the parallel guiding mechanism assigned to the actuating unit concerned, the geometrical-mechanical change associated with an eccentric loading error component, thereby correcting or at least reducing the eccentric loading errors. |
