Load weight indicating system for load moving machine
First Claim
1. A load weight indicating system for a load moving machine including a support, and a front attachment supported by said support for pivotal movement about a first pivot, said front attachment having a first linkage element supported by said support for pivotal movement about said first pivot, a second linkage element supported by said first linkage element for pivotal movement about a second pivot, a loading section supported by said second linkage element, and first and second hydraulic actuator means mounted for pivotally moving the first linkage element and the second linkage element, respectively;
- said load weight indicating system comprising;
first and second displacement detector means for detecting displacement α
1 and β
1 of at least the first linkage element and the second linkage element, respectively, of said front attachment;
pressing force sensor means for obtaining values Pb, Pr associated with a pressing force K1 exerted by at least one of the first and second hydraulic actuator means of said front attachment;
weight calculating means for calculating the weight of a load carried by the loading section based on the values α
1, β
1, Pb and Pr obtained at least by the first and second displacement detector means and the pressing force sensor means, respectively;
weight indicating means for indicating a value associated with the load weight obtained by said weight calculating means; and
position setting means for setting an arbitrarily selected position of said front attachement;
said weight calculating means including;
(a) a first means for calculating a moment of rotation M0 of the front attachment about the first pivot when the loading section carries no load, based on the values α
1, Pb and Pr obtained at least by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through a set position set by said position setting means with the loading section carrying no load,(b) a second means for calculating a moment of rotation M1 of the front attachment about the first pivot when the loading section carries a load, based on the values α
1, Pb and Pr obtained by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through the set position with the loading section carrying the load,(c) a third means for calculating a horizontal distance LJ between a position of the center of gravity of the load in the loading section and the first pivot, based on the values α
1 and β
1 obtained at least by said first and second displacement detector means when the front attachment is moved and passes through the set position, and(d) a fourth means operative to calculate (M1 -M0)/LJ based on the results of the calculation performed by said first, second and third means.
1 Assignment
0 Petitions
Accused Products
Abstract
A load weight calculating system for a load moving machine, such as a hydraulic excavator, including a support, and a front attachment pivotably supported by the support. The front attachment includes a first linkage element pivotably supported by the support, a second linkage element pivotably supported by the first linkage element, a loading section supported by the second linkage element, and first and second hydraulic actuators for moving the first and second linkage elements, respectively. The load weight calculating system includes a first displacement detector and a second displacement detector for obtaining displacements α1 and β1 of at least the first and second linkage elements, respectively, a pressing force sensor for obtaining a pressing force K1 exerted by at least one of the first and second hydraulic actuators, a weight calculating unit for calculating the weight of a load carried by the loading section based on the values α1, β1 and K1 obtained at least by the first and second displacement detector and pressing force sensor, and a weight indicating unit for indicating a value associated with the load weight obtained by the weight calculating unit.
-
Citations
14 Claims
-
1. A load weight indicating system for a load moving machine including a support, and a front attachment supported by said support for pivotal movement about a first pivot, said front attachment having a first linkage element supported by said support for pivotal movement about said first pivot, a second linkage element supported by said first linkage element for pivotal movement about a second pivot, a loading section supported by said second linkage element, and first and second hydraulic actuator means mounted for pivotally moving the first linkage element and the second linkage element, respectively;
-
said load weight indicating system comprising; first and second displacement detector means for detecting displacement α
1 and β
1 of at least the first linkage element and the second linkage element, respectively, of said front attachment;pressing force sensor means for obtaining values Pb, Pr associated with a pressing force K1 exerted by at least one of the first and second hydraulic actuator means of said front attachment; weight calculating means for calculating the weight of a load carried by the loading section based on the values α
1, β
1, Pb and Pr obtained at least by the first and second displacement detector means and the pressing force sensor means, respectively;weight indicating means for indicating a value associated with the load weight obtained by said weight calculating means; and position setting means for setting an arbitrarily selected position of said front attachement; said weight calculating means including; (a) a first means for calculating a moment of rotation M0 of the front attachment about the first pivot when the loading section carries no load, based on the values α
1, Pb and Pr obtained at least by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through a set position set by said position setting means with the loading section carrying no load,(b) a second means for calculating a moment of rotation M1 of the front attachment about the first pivot when the loading section carries a load, based on the values α
1, Pb and Pr obtained by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through the set position with the loading section carrying the load,(c) a third means for calculating a horizontal distance LJ between a position of the center of gravity of the load in the loading section and the first pivot, based on the values α
1 and β
1 obtained at least by said first and second displacement detector means when the front attachment is moved and passes through the set position, and(d) a fourth means operative to calculate (M1 -M0)/LJ based on the results of the calculation performed by said first, second and third means. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A load weight indicating system for a load moving machine including a support, and a front attachment supported by said support for pivotal movement about a first pivot, said front attachment having a first linkage element supported by said support for pivotal movement about said first pivot, a second linkage element supported by said first linkage element for pivotal movement about a second pivot, a loading section supported by said second linkage element, and first and second hydraulic actuator means mounted for pivotally moving the first linkage element and the second linkage element, respectively;
-
said load weight indicating system comprising; first and second displacement detector means for detecting displacement α
1 and β
1 of at least the first linkage element and the second linkage element, respectively, of said front attachment;pressing force sensor means for obtaining values Pb, Pr associated with a pressing force K1 exerted by at least one of the first and second hydraulic actuator means of said front attachment; weight calculating means for calculating the weight of a load carried by the loading section based on the values α
1, β
1, Pb and Pr obtained at least by the first and second displacement detector means and the pressing force sensor means, respectively;weight indicating means for indicating a value associated with the load weight obtained by said weight calculating means; and position setting means for setting an arbitrarily selected position of said front attachment; said weight calculating means including; (a) a first means for calculating a moment of rotation M20 of the front attachment about the first pivot when the loading section carries no load, based on the values α
1, Pb and Pr obtained at least by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through a first set position set by said position setting means with the loading section carrying no load,(b) a second means for calculating a moment of rotation M1 of the front attachment about the first pivot when the loading section carries a load, based on the values α
1, Pb and Pr obtained by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through a second set position set by said position setting means with the loading section carrying the load,(c) a third means for calculating a horizontal distance LJ between a postion of the center of gravity of the load in the loading section and the first pivot, based on the values α
1 and β
1 obtained at least by said first and second displacement detector means when the front attachment is moved and passes through the second set position with the loading section carrying the load, and(d) a fourth means operative to calculate (M1 -M0)/LJ based on the results of the calculation performed by said first, second and third means. - View Dependent Claims (7, 8, 9, 10, 11, 12)
-
-
13. A load weight indicating system for a load moving machine including a support, and a front attachment supported by said support for pivotal movement about a first pivot, said front attachment having a first linkage element supported by said support for pivotal movement about said first pivot, a second linkage element supported by said first linkage element for pivotal movement about a second pivot, a loading section supported by said second linkage element, and first and second hydraulic actuator means mounted for pivotally moving the first linkage element and the second linkage element, respectively;
-
said load weight indicating system comprising; first and second displacement detector means for detecting displacement α
1 and β
1 of at least the first linkage element and the second linkage element, respectively, of said front attachment;first pressing force sensor means for obtaining values Pb, Pr associated with a pressing force K1 exerted by at least one of the first and second hydraulic actuator means of said front attachment; weight calculating means for calculating the weight of a load carried by the loading section based on the values α
1, β
1, Pb and Pr obtained at least by the first and second displacement detector means and the first pressing force sensor means, respectively;weight indicating means for indicating a value associated with the load weight obtained by said weight calculating means; said weight calculating means being operative to preform, based on the values α
1, β
1, Pb and Pr obtained at least by the first and second displacement detector means and the first pressing force sensor means, the operations of;(a) calculating a moment of rotation M1 of the front attachment about the first pivot when the loading section carries a load, (b) calculating a moment of rotation M2 of the front attachment about the first pivot when the loading section carries no load, (c) calculating a horizontal distance Lx between a position of the center of gravity of a load in the loading section and the first pivot, and (d) calculating (M1 -M2)/Lx ; and second pressing force sensor means for obtaining values Ph, P'"'"'r associated with a pressing force K'"'"'1 of the other of said first and second hydraulic actuator means of said front attachment; said weight calculating means being further operative to perform, based on the values α
1, β
1, Ph and Pr obtained at least by said first and second displacement detector means and said second pressing force sensor means, the following operation in addition to the operations (a), (b), (c) and (d) performed with regard to the moment about the first pivot;(e) calculating a moment of rotation M1B of the front attachment about the second pivot when the loading section carries a load, (f) calculating a moment of rotation M2B of the front attachment about the second pivot when the loading section carries no load, (g) calculating a horizontal distance Lx -LB between the position of the center of gravity of the load in the loading section and the second pivot, (h) calculating (M1B -M2B)/Lx -LB, and (i) erasing the horizontal distance Lx between the position of the center of gravity of the load and the first pivot based on the formulas of (d) and (h) to thereby obtain a weight of the load in the loading section. - View Dependent Claims (14)
-
Specification