Dump truck body hoisting state display device

Patent metadata

Field	Value
Publication number	US-9242589-B2
Application number	US-201314380243-A
Country	US
Kind code	B2
Filing date	Feb 7, 2013
Priority date	Feb 22, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A body hoisting state display device to be mounted on a dump truck includes: an angle detection unit that detects a rotation angle of the body with respect to the frame; a seating detection unit that detects whether or not the body is seated on the frame; a calculation unit that causes an inclination angle of the body at which the body is rotated with respect to the frame from a seated state of the body to be calculated, based on the rotation angle detected by the angle detection unit, as a ratio to an angle of a rotatable range that is defined between the seated state and a state in which the hydraulic cylinder is stopped at the position short of the position at which the hydraulic cylinder is extended to the maximal extent; and a display control unit that causes the ratio of the inclination angle of the body that is calculated by the calculation unit to be displayed on a display screen.

First claim

The invention claimed is:

1. A body hoisting state display device to be mounted on a dump truck comprising:
a body mounted on a frame;
a hydraulic cylinder that moves up and down the body with respect to the frame between a seating position and a standing position;
an operating member that operates up-and-down movement of the body;
a hydraulic control controller that controls the up-and-down movement of the body by supplying or discharging pressure oil to or from the hydraulic cylinder, respectively, to extend or retract the hydraulic cylinder, respectively, according to an operation amount of the operating member; and
the hydraulic control controller causes an extension and retraction operation of the hydraulic cylinder to be stopped at a shockless stop position short of the standing position at which the hydraulic cylinder is extended to a maximal extent,
wherein the dump truck body hoisting state display device further comprises:
a body angle sensor that detects a rotation angle of the body with respect to the frame;
a seating switch that detects whether or not the body is seated on the frame;
wherein the hydraulic control controller causes an inclination angle of the body at which the body is rotated with respect to the frame from a seated state of the body to be calculated, based on a rotation angle detected by the body angle sensor, as a ratio to an angle of a rotatable range that is defined between the seated state and a shockless stop state in which the hydraulic cylinder is stopped at the shockless stop position short of the standing position at which the hydraulic cylinder is extended to the maximal extent; and
a display control controller that causes a ratio of the inclination angle of the body that is calculated by the hydraulic control controller to be displayed on a display screen.

2. The dump truck body hoisting state display device according to claim 1 , wherein:
when the seating switch detects that the body is non-seated with respect to the frame, the display control controller causes the ratio of the inclination angle of the body and an icon, which indicates that the body is during the up-and-down movement, to be displayed on the display screen, and
when the seating switch detects that the body is seated with respect to the frame, the display control controller causes the display of the ratio of the inclination angle of the body and the icon to be interrupted.

3. The dump truck body hoisting state display device according to claim 1 , further comprising:
the hydraulic control controller that causes the hydraulic cylinder to stop an extension operation thereof at the shockless stop position short of the standing position at which the hydraulic cylinder is extended to the maximal extent, wherein
the display control controller causes the ratio of the inclination angle of the body calculated by the hydraulic control controller to be displayed numerically as 0 percent on the display screen when the seating switch detects that the body is seated with respect to the frame, and
when the body is stopped at the shockless stop position short of the position at which the hydraulic cylinder is extended to the maximal extent, the display control controller causes the ratio of the inclination angle of the body calculated by the hydraulic control controller to be displayed numerically as 100 percent on the display screen, and when the body is at any angular position within the rotatable range, the display control controller causes the ratio of the inclination angle of the body to the angle at the shockless stop position short of the standing position at which the hydraulic cylinder is extended to the maximal extent to be displayed numerically on the display screen.

4. The dump truck body hoisting state display device according to claim 3 , further comprising:
a non-transitory storage medium that stores a seating angle based on a first signal value output from the body angle sensor when the body is seated and a shockless stop angle based on a second signal value output from the body angle sensor when the hydraulic cylinder stops extension and retraction operation thereof at the shockless stop position short of the standing position at which the hydraulic cylinder is extended to the maximal extent so that the body is stopped at a shockless stop position short of the standing position, wherein:
the hydraulic control controller calculates a rotatable angle of the body based on a difference between the seating angle and the shockless stop angle, and a rotation angle of the body based on a difference between a third signal value output from the body angle sensor at any rotating position of the body and the first signal value, and divides the rotation angle of the body by the rotatable angle of the body, and
the display control controller causes the inclination angle of the body to be displayed on the display screen in ratio based on a result of division by the hydraulic control controller.

5. The dump truck body hoisting state display device according to claim 1 , wherein:
the display control controller causes the ratio of the inclination angle of the body to be displayed in a form of a bar graph on the display screen.

Assignees

• Hitachi Construction Machinery

Inventors

• Itai Yudai
• Minoshima Toshikazu
• Yagyu Takashi
• Ikari Takanobu
• Kurosawa Takao

Classifications

• B60P1/283 Primary

  Elements of tipping devices · CPC title