Construction machine
AssigneesHiroshima University, Kobelco Construction Machinery Co., Ltd.
InventorsRyota Hashimoto, Yasuhiko Shimazu, Sho Okimoto
Life of this patent
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Abstract
A construction machine is capable of preventing degradation in efficiency of excavation work while preventing an increase in excavation resistance in the excavation work. A controller of a construction machine determines an accommodation state of earth and sand accommodated in a bucket, and outputs a resistance reduction command signal that is a command signal for operating a work device such that the bucket is displaced in a resistance reduction direction that is a direction where excavation resistance acting on the bucket is capable of being reduced, in accordance with a result of determining the accommodation state.
Claims7
A construction machine, comprising:
- a machine body;
- a work device including a boom supported to the machine body to be capable of being raised and lowered, an arm rotatably supported to the boom, and a bucket supported to the arm, the bucket having a bucket base end portion that is a base end portion rotatably attached to the arm about a horizontal axis, a bucket tip portion that is a tip portion on an opposite side of the bucket base end portion, and an inner surface defining an accommodation space that is a space capable of accommodating earth and sand;
- at least one operation device including an operation lever configured to be operated by an operator, the at least one operation device being configured to cause the work device to perform excavation work so that earth and sand on a ground is excavated by displacing the bucket with respect to the ground while maintaining a state where a portion including at least the bucket tip portion is in contact with the ground at an excavation attitude that is a bucket attitude at which the bucket base end portion is disposed at a position higher than the bucket tip portion and is an attitude at which the earth and sand on the ground is capable of being excavated;
- and
- a controller,
- wherein the controller
- determines, during the excavation work, a contact state between a specific upper region and the earth and sand, the specific upper region being a portion located at an upper portion on the inner surface of the bucket at the excavation attitude, and
- outputs, in a case where the controller determines that the earth and sand is in contact with the specific upper region on the inner surface of the bucket during the excavation work, a resistance reduction command signal that is a command signal for operating the work device so that the bucket is displaced in a resistance reduction direction that is a direction where excavation resistance acting on the bucket is capable of being reduced, the resistance reduction direction being a direction in which a position of the horizontal axis which is a rotation center of the bucket base end portion is displaced upward or obliquely upward.
Dependencies are inferred from the claim text.