초록 ▼

A weighing device with several weighing cells which are rigidly interconnected, and which have a load sensor with a predetermined load insertion direction, with at least one acceleration sensor and with at least one evaluating unit to which the weight signals generated by the weighing cells and the

A weighing device with several weighing cells which are rigidly interconnected, and which have a load sensor with a predetermined load insertion direction, with at least one acceleration sensor and with at least one evaluating unit to which the weight signals generated by the weighing cells and the disturbance signals generated by the acceleration sensors can be transmitted. The evaluating unit uses a predetermined rule for each weighing cell to determine a correcting quantity from the disturbance signal of the acceleration sensor(s) as a function of the weighing cell geometric location relative to the geometric location of the acceleration sensor(s), and in that the weight signal, which is affected by the acceleration disturbance(s), of the relevant weighing cell is combined, with the correcting quantity in such a way that the influence of the acceleration disturbance(s) on the weight signal is substantially compensated.

대표청구항 ▼

The invention claimed is: 1. A weighing device comprising: (a) several weighing cells, which are mechanically rigidly interconnected and each have a load sensor that can be acted on by a load, and which have a predetermined load insertion direction; (b) at least one acceleration sensor for the dete

The invention claimed is: 1. A weighing device comprising: (a) several weighing cells, which are mechanically rigidly interconnected and each have a load sensor that can be acted on by a load, and which have a predetermined load insertion direction; (b) at least one acceleration sensor for the detection of at least one acceleration disturbance; (c) at least one evaluating unit to which weight signals generated by the weighing cells and disturbance signals generated by the acceleration sensors are adapted to be transmitted; and (d) wherein the at least one evaluating unit is configured so that: (i) using a predetermined rule for each respective weighing cell, a correcting quantity is determined from the disturbance signal of the at least one acceleration sensor as a function of the geometric location of the respective weighing cell relative to the geometric location of the at least one acceleration sensor where the correcting quantity takes into account an influence, operating at the geometric location of the relevant weighing cell, of the at least one acceleration disturbance; and (ii) the weight signal of the respective weighing cell, that is affected by the at least one acceleration disturbance, is combined with the correcting quantity, or processed computationally, so that the influence of the at least one acceleration disturbance on the weight signal is substantially compensated. 2. The weighing device of claim 1, wherein the at least one acceleration sensor is rigidly connected to the weighing cells. 3. The weighing device of claim 1, wherein the weighing cells are rigidly connected mechanically with a rigid support element. 4. The weighing device of claim 1, wherein load insertion directions of the weighing cells run substantially parallel to each other. 5. The weighing device of claim 1, wherein the number and type of the acceleration sensors is established so that it is possible to detect or determine both a component of a purely translational acceleration disturbance that exists in the load insertion direction of each weighing cell, and also those components of rotational acceleration disturbances that exist in the load insertion direction, where the components are generated by a one-axis or multiple-axis rotational disturbance movement of the weighing cells. 6. The weighing device of claim 5, wherein the at least one evaluating unit is configured so that: (a) using a predetermined rule for each respective weighing cell, a second correcting quantity is determined from the disturbance signals of the acceleration sensors as a function of the geometric location of the relevant weighing cells relative to the geometric locations of the acceleration sensors, where the second correcting quantity takes into account an influence, operating at the geometric location of the relevant weighing cell, of those components of the acceleration disturbances which are in the load insertion direction of the relevant weighing cell; and (b) the weight signal of the respective weighing cell affected by a disturbing quantity of the relevant weighing cell is combined with the second correcting quantity, or processed computationally, such that the influence on the weight signal of the components of the acceleration disturbances in the load insertion direction of the relevant weighing cell, is substantially compensated. 7. The weighing device of claim 5, characterized in that the number and type of the acceleration sensors are fixed so that, in addition to said components of the acceleration disturbances in the load insertion direction of each weighing cell, at the location of each weighing cell, single-axis or multiple-axis rotational acceleration disturbances can be detected or determined that have an effect on the inertial moment(s) of parts of the weighing cells that are movable about corresponding axes with respect to a fixed foundation body. 8. The weighing device of claim 7, wherein the at least one evaluating unit is configured so that: (a) using a predetermined rule for each respective weighing cell, a third correcting quantity is determined from the disturbance signals of the acceleration sensors as a function of the geometric location of the relevant weighing cells with respect to the geometric locations of the acceleration sensors, where the third correcting quantity in addition takes into account the influence, operating at the geometric location of the relevant weighing cell, of the single-axis or multiple-axis rotational acceleration disturbances on the inertial moment(s) of the measurement mechanisms of the relevant weighing cell about corresponding axes; and (b) the weight signal, affected by the disturbance, of the relevant weighing cell is combined, or processed computationally, with the third correcting quantity in such a way that the influence of the rotational acceleration disturbances on the weight signal is substantially compensated. 9. The weighing device of claim 5, wherein two translational acceleration sensors, arranged at a predetermined separation from each other, are provided, and in that the weighing cells are arranged on the line connecting the two translational acceleration sensors. 10. The weighing device of claim 9, wherein the at least one evaluating unit is adapted to determine a weight signal Gk(t) of a weighing cell in position k according to the relation G k ⁡ ( t ) = m k ⁡ ( t ) + ( m k ⁡ ( t ) + m VL k ) · z ¨ k ⁡ ( t ) g where mk(t) denotes the mass of the load on the weighing cell, mVLk denotes the unladen mass of the relevant moved masses of the measurement mechanisms and the mass of an optional preload on the weighing cell in position k, {umlaut over (z)}k(t) denotes a total translational disturbing acceleration in the detection direction of the weighing cell at the location of the weighing cell, and g denotes the gravitational acceleration; and in that the weighing cell determines the translational disturbing acceleration according to the relation z ¨ k ⁡ ( t ) = z ¨ BA ⁢ ⁢ 1 ⁡ ( t ) · x BA ⁢ ⁢ 2 - x WZk x BA ⁢ ⁢ 2 - x BA ⁢ ⁢ 1 + z ¨ BA ⁢ ⁢ 2 ⁡ ( t ) · x WZk - x BA ⁢ ⁢ 1 x BA ⁢ ⁢ 2 - x BA ⁢ ⁢ 1 where {umlaut over (z)}BA1(t) and {umlaut over (z)}BA2(t) denote the measurement signals of the two translational acceleration sensors, and xBA1, xBA2, xWZk denote the geometric locations of the two translational acceleration sensors and of the relevant weighing cell on the line. 11. The weighing device of claim 9, further including at least one additional translational acceleration sensor having a predetermined separation from the connecting line. 12. The weighing device of claim 11, wherein the at least one translational acceleration sensor is arranged on a central normal line onto an interval between the two translational acceleration sensors. 13. The weighing device of claim 11, wherein the weighing cells are configured and arranged so that the measurement mechanisms have a rotational oscillation sensitivity essentially only about an axis that is parallel to the line x on which the weighing cells are arranged. 14. The weighing device of claim 13, wherein the at least one evaluating unit determines the weight signal Gk(t) of a weighing cell in position k according to the relation G k ⁡ ( t ) = m k ⁡ ( t ) + ( m k ⁡ ( t ) + m VL k ) · z ¨ WZk ⁡ ( t ) g + k k · φ ¨ xt ⁡ ( t ) where mk(t) denotes the mass of the load of the weighing cell, mVLk denotes the unladen mass of the relevant moved mass of the measurement mechanisms and the mass of an optional preload of the weighing cell, {umlaut over (z)}k(t) denotes the total translational disturbing acceleration in the detection direction of the weighing cell at the location of the respective weighing cell, g denotes the gravitational acceleration, kk denotes the rotational sensitivity of the measurement mechanisms of the weighing cell at the location k about a line that is parallel to the connecting line, and {umlaut over (φ)}xk(t) denotes the rotational disturbing acceleration about this axis; in that the at least one evaluating unit determines the translational disturbing acceleration according to the relation z ¨ k ⁡ ( t ) = z ¨ BA ⁢ ⁢ 1 ⁡ ( t ) · x BA ⁢ ⁢ 2 - x WZk x BA ⁢ ⁢ 2 - x BA ⁢ ⁢ 1 + z ¨ BA ⁢ ⁢ 2 ⁡ ( t ) · x WZk - x BA ⁢ ⁢ 1 x BA ⁢ ⁢ 2 - x BA ⁢ ⁢ 1 where {umlaut over (z)}BA1(t) and {umlaut over (z)}BA2(t) denote the measurement signals of the two translational acceleration sensors and xBA1, xBA2, xWZk denote geometric locations of the two translational acceleration sensors and of the relevant weighing cell on the line, and in that the at least one evaluating unit determines the rotational disturbing acceleration {umlaut over (φ)}xk(t) according to the relation φ ¨ xk ⁡ ( t ) = z ¨ BA ⁢ ⁢ 3 ⁡ ( t ) - 1 2 ⁢ z ¨ BA ⁢ ⁢ 1 ⁡ ( t ) - 1 2 ⁢ z ¨ BA ⁢ ⁢ 2 ⁡ ( t ) y BA ⁢ ⁢ 3 - 1 2 ⁢ y BA ⁢ ⁢ 1 - 1 2 ⁢ y BA ⁢ ⁢ 2 where {umlaut over (z)}BA1(t), {umlaut over (z)}BA2(t) and {umlaut over (z)}BA3(t) denote the measurement signals of the two translational acceleration sensors and of the additional translational acceleration sensor, and yBA1, yBA2 and yBA3 denote the geometric locations of the translational acceleration sensors in a direction perpendicular to the line x. 15. The weighing device of claim 1, characterized in that the acceleration sensors are formed as capacitive acceleration sensors, where the deflection of a seismic mass from a starting position is determined by using capacitance, and the seismic mass is reset to the starting position by the generation of an electrostatic force using a closed loop system, where the resetting force required for this purpose represents a measure of the detected acceleration. 16. The weighing device of claim 1, further comprising an evaluating unit for each weighing cell, or evaluating unit provided for a group of weighing cells. 17. The weighing device of claim 1, wherein the weighing cells and the at least one acceleration sensor are rigidly connected mechanically with a rigid support element. 18. The weighing device of claim 17, wherein the rigid support element is a common rigid base plate. 19. The weighing device of claim 3, wherein the rigid support element is a common rigid base plate.