Multi-joint underwater robot having complex movement functions of walking and swimming and underwater exploration system using same
First Claim
1. A multi-joint underwater robot having a complex movement function, the multi-joint underwater robot comprising:
- a streamlined body;
multi-joint walking legs mounted at left and right sides and a front side of the body, each of the walking legs having multiple joints;
a control unit mounted in the body to control a walking state and a swimming state through the multi-joint walking legs;
a walking leg driving unit controlled by the control unit and generating a driving signal to drive the multi-joint walking legs;
a sensing unit mounted in the body to sense a posture of the body and contact of the body with an external object;
a buoyancy sensing unit mounted in the body to sense buoyancy of the body; and
a communication unit to transceive wired and wireless signals with an external device,wherein the sensing unit comprises;
a force/moment sensor mounted between the body and the legs of the multi-joint underwater robot;
a landing force sensor mounted in an end portion of the legs; and
a moment sensor mounted at two front legs among the multi-joint walking legs of the multi-joint underwater robot to sense landing of the front legs, andwherein each leg of the multi-joint walking legs has a link structure of four joints, and the two front legs of the multi-joint walking legs have link structures of six joints, the joints constituting the two front legs are utilized when the two front legs are used for robot arms, which perform roll, pitch, and yaw rotation motions about X, Y, and Z axes, respectively, andwherein a joint mechanism of the multi-joint walking legs comprises;
joint driving motors including frameless BLDC motors;
harmonic drive reducers minimizing backlashes of the multi-joints and obtaining proper deceleration ratios;
electric encoders, mounted at the harmonic drive reducers output side, obtaining absolute angles of the multi-joints from the harmonic drive reducers and providing the absolute angles; and
joint limit sensors, mounted at the multi-joints, comprising magnetic proximity switches sensing feedbacks of the multi-joints.
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Accused Products
Abstract
Disclosed is an underwater exploration system using a multi-joint underwater robot having a novel complex movement concept in which the multi-joint underwater robot moves through walking or swimming with multi-joint legs closely to a seafloor, differently from a conventional underwater robot to obtain a thrust through a propeller scheme. The underwater exploration system includes the multi-joint underwater robot having the complex movement function according, a depressor, and a mother ship to store data of an underwater state transmitted from the multi-joint underwater robot and to monitor and control a movement direction of the multi-joint underwater robot. The depressor is connected to the mother ship through a primary cable, the multi-joint underwater robot is connected to the depressor through a second cable, and resistance force of the primary cable is applied to the depressor without being transmitted to the multi-joint underwater robot.
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Citations
13 Claims
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1. A multi-joint underwater robot having a complex movement function, the multi-joint underwater robot comprising:
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a streamlined body; multi-joint walking legs mounted at left and right sides and a front side of the body, each of the walking legs having multiple joints; a control unit mounted in the body to control a walking state and a swimming state through the multi-joint walking legs; a walking leg driving unit controlled by the control unit and generating a driving signal to drive the multi-joint walking legs; a sensing unit mounted in the body to sense a posture of the body and contact of the body with an external object; a buoyancy sensing unit mounted in the body to sense buoyancy of the body; and a communication unit to transceive wired and wireless signals with an external device, wherein the sensing unit comprises; a force/moment sensor mounted between the body and the legs of the multi-joint underwater robot; a landing force sensor mounted in an end portion of the legs; and a moment sensor mounted at two front legs among the multi-joint walking legs of the multi-joint underwater robot to sense landing of the front legs, and wherein each leg of the multi-joint walking legs has a link structure of four joints, and the two front legs of the multi-joint walking legs have link structures of six joints, the joints constituting the two front legs are utilized when the two front legs are used for robot arms, which perform roll, pitch, and yaw rotation motions about X, Y, and Z axes, respectively, and wherein a joint mechanism of the multi-joint walking legs comprises; joint driving motors including frameless BLDC motors; harmonic drive reducers minimizing backlashes of the multi-joints and obtaining proper deceleration ratios; electric encoders, mounted at the harmonic drive reducers output side, obtaining absolute angles of the multi-joints from the harmonic drive reducers and providing the absolute angles; and joint limit sensors, mounted at the multi-joints, comprising magnetic proximity switches sensing feedbacks of the multi-joints. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An underwater exploration system using a multi-joint underwater robot having a complex movement function, the underwater exploration system comprising:
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the multi-joint underwater robot having the complex movement function comprising; a streamlined body; multi-joint walking legs mounted at left and right sides and a front side of the body, each of the multi-joint walking legs having multiple joints; a control unit mounted in the body to control a walking state and a swimming state through the multi-joint walking legs; a walking leg driving unit controlled by the control unit and generating a driving signal to drive the multi-joint walking legs; a sensing unit mounted in the body to sense a posture of the body and contact of the body with an external object, the sensing unit comprising; a force/moment sensor mounted between the body and the legs of the multi-joint underwater robot; a landing force sensor mounted in an end portion of the leg; and a moment sensor mounted at two front legs of the multi-joint underwater robot to sense landing of the front legs; a buoyancy sensing unit mounted in the body to sense buoyancy of the body; and a communication unit to transceive wired and wireless signals with an external device, wherein each leg of the multi-joint walking legs has a link structure of four joints, and the two front legs of the multi-joint walking legs have link structures of six joints, the joints constituting the two front legs are utilized when the two front legs are used for robot arms, which perform roll, pitch, and yaw rotation motions about X, Y, and Z axes, respectively, wherein a joint mechanism of the multi-joint walking legs comprises; joint driving motors including frameless BLDC motors; harmonic drive reducers minimizing backlashes of the multi-joints and obtaining proper deceleration ratios; electric encoders, mounted at the harmonic drive reducers output side, obtaining absolute angles of the multi-joints from the harmonic drive reducers and providing the absolute angles; and joint limit sensors, mounted at the multi-joints, comprising magnetic proximity switches sensing feedbacks of the multi-joints; a depressor; and a mother ship to store data of an underwater state transmitted from the multi-joint underwater robot and to monitor and control a movement direction of the multi-joint underwater robot, wherein the depressor is connected to the mother ship through a primary cable, the multi-joint underwater robot is connected to the depressor through a second cable, and resistance force of the primary cable is applied to the depressor without being transmitted to the multi-joint underwater robot. - View Dependent Claims (11, 12, 13)
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Specification