Drive control device for construction machine and construction machine provided with same

1 . A drive control device for a construction machine including: a body; and a work device including a boom supported by the body to allow a derricking movement and a pivoting member pivotably supported by the boom,

the drive control device comprising a controller that controls a movement of the work device,

wherein the controller:

sets a target land leveling angle that is a target for a land leveling angle in land leveling work performed by the work device;

calculates a pivoting member gravity center velocity that is a velocity of a center of gravity of the pivoting member;

calculates a target velocity that is a target for a velocity of a composite center of gravity of the entire work device by using the pivoting member gravity center velocity and the target land leveling angle; and

controls a movement of the boom to make an actual velocity of the composite center of gravity closer to the target velocity,

wherein the controller determines a contribution level that the movement of the pivoting member accounts for in the movement of the entire work device in the land leveling work to have a larger value when the target land leveling angle is small than when the target land leveling angle is large, and calculates the target velocity by using the pivoting member gravity center velocity and the contribution level.

2 . The drive control device according to claim 1 , further comprising a compacting pressure input device that receives input to adjust compacting pressure that is strength of force applied to ground by the pivoting member in the land leveling work,

wherein the controller increases or decreases the contribution level based on the input to the compacting pressure input device.

3 . The drive control device according to claim 1 , wherein

the pivoting member includes an arm pivotably supported by the boom, and a tip member pivotably supported by the arm, and

the controller calculates a composite center of gravity of the arm and the tip member as the center of gravity of the pivoting member.

4 . The drive control device according to claim 3 , further comprising a setting input device that receives input for setting the target land leveling angle,

wherein the controller sets the target land leveling angle based on an angle of the tip member when the input is made to the setting input device.

5 . The drive control device according to claim 1 , further comprising

a boom operation device to which a boom operation to move the boom is given,

wherein the controller calculates a boom correction value to move the boom to make the actual velocity of the composite center of gravity closer to the target velocity, and controls the movement of the boom by using a boom operation value according to an operation amount of the boom operation and the boom correction value.

6 . The drive control device according to claim 5 , wherein the controller uses the boom operation value and the boom correction value to calculate a control input value for controlling the movement of the boom to make a ratio of the boom correction value to the boom operation value higher when an operating skill of the operator regarding the land leveling work is low as compared with when the operating skill is high.

7 . A drive control device for a construction machine including: a body; and a work device including a boom supported by the body to allow a derricking movement and a pivoting member pivotably supported by the boom, the drive control device comprising:

a controller that controls a movement of the work device,

wherein the controller:

sets a target land leveling angle that is a target for a land leveling angle in land leveling work performed by the work device;

calculates a pivoting member gravity center velocity that is a velocity of a center of gravity of the pivoting member;

calculates a target velocity that is a target for a velocity of a composite center of gravity of the entire work device by using the pivoting member gravity center velocity and the target land leveling angle; and

controls a movement of the boom to make an actual velocity of the composite center of gravity closer to the target velocity; and

a boom operation device to which a boom operation to move the boom is given,

wherein the controller calculates a boom correction value to move the boom to make the actual velocity of the composite center of gravity closer to the target velocity, and controls the movement of the boom by using a boom operation value according to an operation amount of the boom operation and the boom correction value, and

wherein the controller uses the boom operation value and the boom correction value to calculate a control input value for controlling the movement of the boom to make a ratio of the boom correction value to the boom operation value higher when an operating skill of the operator regarding the land leveling work is low as compared with when the operating skill is high.

8 . A construction machine comprising:

a body;

a work device including a boom supported by the body to allow a derricking movement and a pivoting member pivotably supported by the boom; and

a drive control device comprising a controller that controls a movement of the work device,

wherein the controller:

sets a target land leveling angle that is a target for a land leveling angle in land leveling work performed by the work device;

calculates a pivoting member gravity center velocity that is a velocity of a center of gravity of the pivoting member;

calculates a target velocity that is a target for a velocity of a composite center of gravity of the entire work device by using the pivoting member gravity center velocity and the target land leveling angle; and

controls a movement of the boom to make an actual velocity of the composite center of gravity closer to the target velocity, and

wherein the controller determines a contribution level that the movement of the pivoting member accounts for in the movement of the entire work device in the land leveling work to have a larger value when the target land leveling angle is small than when the target land leveling angle is large, and calculates the target velocity by using the pivoting member gravity center velocity and the contribution level.