Indirect suspended load weighing apparatus
First Claim
1. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket, said system comprising:
- a swing drive torque determination circuit for determining a torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of an instantaneous swing drive motor torque;
a radius sensing circuit for sensing a radius of the load bucket with respect to the swing axis and providing a radius signal;
a speed sensing circuit for determining an angular speed of the load bucket with respect to the swing axis and providing an angular speed signal; and
a computation circuit responsive to the instantaneous swing drive torque signal, the radius signal and the angular speed signal, said computation circuit computing a weight of the moving load.
1 Assignment
0 Petitions
Accused Products
Abstract
An indirect suspended load weight measuring system that is suitable for use with an excavator that has a moving load bucket rotating about a swing axis. The load bucket has a load therein, and the excavator has a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket. The system comprises a torque determination circuit for determining a torque of the swing drive motor and for outputing a motor torque signal having a parameter representative of an instantaneous motor torque. A radius sensing circuit senses a radius of the load bucket with respect to the swing axis and provides a radius signal. A speed sensing circuit determines an angular speed of the load bucket with respect to the swing axis and provides an angular speed signal. A computation circuit responsive to the instantaneous torque signal, the radius signal and the angular speed signal, computes a weight of the moving load.
41 Citations
31 Claims
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1. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket, said system comprising:
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a swing drive torque determination circuit for determining a torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of an instantaneous swing drive motor torque; a radius sensing circuit for sensing a radius of the load bucket with respect to the swing axis and providing a radius signal; a speed sensing circuit for determining an angular speed of the load bucket with respect to the swing axis and providing an angular speed signal; and a computation circuit responsive to the instantaneous swing drive torque signal, the radius signal and the angular speed signal, said computation circuit computing a weight of the moving load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket, said system comprising:
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a swing drive torque determination circuit for determining an instantaneous torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of the instantaneous swing drive motor torque; a radius sensing circuit for sensing a radius of the load bucket with respect to the swing axis, said radius sensing circuit providing a first radius signal at a first point during rotation of the bucket, and providing a second radius signal at a second point during rotation of the bucket; a speed sensing circuit for determining an angular speed of the load bucket with respect to the swing axis, said speed sensing circuit providing a first angular speed signal at the first point during rotation of the bucket, and providing a second angular speed signal at the second point during rotation of the bucket; and a computation circuit for computing a weight of the load as a function of the instantaneous swing drive torque signal, the first and second radius signals, and the first and second angular speed signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, said system comprising:
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a rope supporting the load bucket, said rope having a variable extended length; a swing drive torque determination circuit for determining a torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of an instantaneous swing drive motor torque; a radius sensing circuit for sensing a radius of the load bucket with respect to the swing axis and providing a radius signal; a speed sensing circuit for determining an angular speed of the load bucket with respect to the swing axis and providing an angular speed signal; and a computation circuit responsive to the instantaneous swing drive torque signal, the radius signal and the angular speed signal, said computation circuit computing a weight of the moving load as a function of a variable inertia of the extended lengths of the rope. - View Dependent Claims (24)
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25. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket, said system comprising:
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torque determination means for determining a torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of an instantaneous swing drive motor torque; radius sensing means for sensing a radius of the load bucket with respect to the swing axis and providing a radius signal; speed sensing means for determining an angular speed of the load bucket with respect to the swing axis and providing an angular speed signal; and computation means responsive to the instantaneous swing drive torque signal, the radius signal and the angular speed signal, said computation means for computing a weight of the moving load as a function of a variable angular momentum of the moving load. - View Dependent Claims (26, 27)
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28. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for rotating the bucket, and a hoist rope for supporting the load bucket, said system comprising:
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torque determination means for determining an instantaneous torque of the swing drive motor and for outputing a swing drive motor torque signal having a parameter representative of the instantaneous swing drive motor torque; radius sensing means for sensing a radius of the load bucket with respect to the swing axis, said radius sensing means providing a first radius signal at a first point during rotation of the bucket, and providing a second radius signal at a second point during rotation of the bucket; speed sensing means for determining an angular speed of the load bucket with respect to the swing axis, said speed sensing means providing a first angular speed signal at the first point during rotation of the bucket, and providing a second angular speed signal at the second point during rotation of the bucket; and computation means for computing a weight of the load as a function of the instantaneous swing drive torque signal, the first and second radius signals, and the first and second angular speed signals. - View Dependent Claims (29, 30)
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31. An indirect suspended load weight measuring system suitable for use with an excavator having a moving load bucket rotating about a swing axis, the load bucket having a load therein, and the excavator having a swing drive motor for moving the bucket, and a hoist rope for supporting the load bucket, said system comprising:
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a swing drive torque determination circuit for determining a torque of the swing drive motor and for outputing a motor torque signal having a parameter representative of an instantaneous swing drive motor torque; a radius sensing circuit for sensing a radius of the load bucket with respect to the swing axis and providing a radius signal; a speed sensing circuit for determining an angular speed of the load bucket with respect to the swing axis and providing an angular speed signal; and a computation circuit responsive to the instantaneous swing drive torque signal, the radius signal and the angular speed signal, said computation circuit computing a weight of the moving load as a function of a variable angular momentum of the moving load.
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Specification