摘要:
Provided is a method of driving a joint device suitably used for a robot joint with improved back drivability. A first motor and a second motor are fixedly connected to a first link. An output shaft of the first motor is coupled to an internal gear of a differential speed reducer. An output shaft of the second motor is coupled to an external gear of the differential speed reducer. A second link is coupled to the internal gear of the differential speed reducer. When the first link and the second link are relatively stopped to keep a joint angle fixed, both of the first motor and the second motor are rotated with a rotational speed larger than zero, and the rotational speed of the first motor and that of the second motor are differentiated to stop the second link.
摘要:
A parallel link mechanism arranged between a fixed base and a movable base includes a harmonic drive gear reducer, a first arm, a second arm, a connection base, a first auxiliary link, and a second auxiliary link. The harmonic drive gear reducer has a body, an input shaft, a first output shaft, and a second output shaft. The first arm has a proximal end pivotally connected to the fixed base and a distal end connected to the body of the reducer. The second arm has a proximal end connected to the second output shaft and a distal end pivotally connected to the movable base. The connection base is arranged outside the second arm with respect to the reducer and connected to the first output shaft. The first auxiliary link is arranged parallel with the first arm and has an end pivotally connected to the fixed base and an end pivotally connected to the connection base. The second auxiliary link is arranged parallel with the second arm and has an end pivotally connected to the connection base and an end pivotally connected to the movable base.
摘要:
An improved robotic arm system for servicing the tubesheet located within the channel head of a nuclear steam generator is provided. The system includes a robotic arm whose shoulder and elbow joints are rotatable only in the plane parallel to the tubesheet in order to eliminate the imposition of cantileverly-induced torques on the electric motors driving these joints, as well as to minimize the possibility of mechanical interference between the arm and the walls of the channel head. Each of the motorized joint assemblies of the arm includes resolvers connected not only to the output of the drive train that moves the joint, but also to the drive shaft of the electric motor that drives the drive train, wherein the feedback signal generated by the resolver connected to the drive shaft of the electric motor is the primary signal used to modulate the amount of electric power conducted to the motor of the joint. Such a configuration advantageously results in smoother robotic arm movement. Finally, the control circuit assembly of the robotic arm system includes a control processing unit (CPU) which is capable of simultaneously driving not only the joint assemblies of the robotic arm, but also any computer-operated mechanisms associated with a variety of end effectors which the arm is capable of delivering. The CPU, power supply and other components of the control circuit assembly are installable in the containment area surrounding the steam generator in order to eliminate the number of cable penetrations through the containment walls that are necessary to operate the system.
摘要:
A digitally controlled industrial robot comprises a set of unitized and integrated joint drive modules which can be assembled in series to form an arm. The joints are of two basic types, pitch joints and roll joints, with the roll joints providing rotation about the longitudinal axis of the manipulator and the pitch joints providing rotation about axes which are substantially perpendicular to and offset from the roll joint axes. Any number of joints may be assembled to comprise the manipulator, permitting the configuration of a kinematically redundant manipulator. A servocontrol derives feedback from sensing the motive force on a driven member and compensates the drive signal accordingly. More particularly, the torque exerted on each roll and pitch joint is measured and used for feedback to provide stability and optimum bandwidth for the servomechanism.
摘要:
A robot joint has a support carrying a rotary robot arm. An electric drive motor is mounted on the support and its drive shaft is coupled to the robot arm by harmonic drive-type reduction gears. The reduction gears include an elastically deformable, externally toothed ring whose elliptical shape is rotated by the drive shaft. The externally toothed ring itself is stationary and is firmly connected to the support by a flexible sleeve provided at its free end with a rigid mounting flange. The annular mounting face of the flange and the opposite mounting face on the support is each provided with radial teeth, preferably in the form of Hirth-type gears, which guarantee an accurate centering of the sleeve and safeguard the same against turning. Preferably, the flange is fastened to the end face of a steel bushing which is pressed into a bore in the support and secured against turning by knurled serrations. The robot arm is mounted for rotation in a pretensioned cross-roller bearing which provides a compact and bend resistant connection to the support.
摘要:
A wrist driving mechanism for an industrial robot has a first base wrist unit (13) supported on the free end of a robot arm (11) and capable of rotating about a first axis (.gamma.). The first base wrist unit (13) is mounted with a second base wrist unit (14) capable of rotating about a second axis (.beta.). The second base wrist unit (14) is mounted with a fore wrist unit (15) capable of rotating about a third axis (.alpha.). The robot arm (11) is provided along the longitudinal direction thereof with a first power transmitting unit (16) for transmitting a rotative power to the first base wrist unit (13). A second power transmitting unit (19) for transmitting a rotative power to the second base wrist unit (14) is formed along the robot arm (11) and the first base wrist unit (13). A motor (25) for driving the fore wrist unit (15) for rotation is mounted on the first base wrist unit (13). The driving shaft of the motor (25) is coupled with a first transmission shaft (26) extended along the second axis (.beta.). The first transmission shaft (26) is connected through a gear train (27) to the second transmission shaft (28) extended along the third axis (.alpha.) and the second transmission shaft (28) is connected to the fore wrist unit (15). The second transmission shaft (28) is associated with a reduction gear mechanism (31).
摘要:
An industrial robot is constituted by a plurality of series connected arm units each composed of a driving unit from among a plurality of driving units having different driving powers and different driving speeds, a joint unit from among a plurality of joint units having different driving speeds and power transmitting capacities, and an arm from among a plurality of arms having different sizes and load capacities. The joint units, driving units and arms each have connecting surfaces thereon having positioning parts and setting-fixing parts in a predetermined pattern for enabling the joint units, driving units and arms to be detachably connected to other joint units, driving units and arms at corresponding connecting surfaces to form arm units with the desired joint units, driving units and arms. The joint units each have a stationary frame and a follower frame rotatably connected to each other and driving power transmitting mechanism connected between said frames and including reduction gears. The driving units each have a motor and an output member fixed to the motor shaft which, when a driving unit is connected with a joint unit, is engaged with power transmitting mechanism.
摘要:
A powered wrist joint consisting of a base having a pitch member mounted thereon for rotation about a pitch axis and a pitch drive mounted on the base for driving the pitch member about the pitch axis and a yaw shaft mounted on the pitch member on a yaw axis which is disposed at right angles to and intersects the pitch axis. A housing is mounted on the yaw shaft for rotation about the yaw axis. A yaw drive is mounted in the housing for driving the housing about the yaw axis and a roll shaft is mounted for rotation in the housing about the roll axis which is disposed at right angles to the pitch and yaw axes and intersects the pitch and yaw axes at their point of intersection thereby to provide a common center of pitch, yaw and roll gyration.
摘要:
A strain wave gear comprising an outer ring and an inner ring rotatably arranged in the outer ring. The inner ring comprises an internally toothed gear and a flex spline is arranged in the inner ring and comprise a flexible part comprising an external toothed gear. A wave generator is rotatable in relation to the flex spline and is configured to flex the flexible part in a radial direction to partly mesh the external toothed gear with the internally toothed gear causing rotation of the inner ring in relation to the outer ring. A part of said inner ring extends out of said outer ring and comprises an outwardly protruding output flange. An encoder reader can be disposed on the outer ring and an encoder track can disposed on the inner ring. A robot joint comprising the strain wave gear is also disclosed.
摘要:
An example robot includes: a motor disposed at a joint configured to control motion of a member of the robot; a transmission including an input member coupled to and configured to rotate with the motor, an intermediate member, and an output member, where the intermediate member is fixed such that as the input member rotates, the output member rotates therewith at a different speed; a pad frictionally coupled to a side surface of the output member of the transmission and coupled to the member of the robot; and a spring configured to apply an axial preload on the pad, wherein the axial preload defines a torque limit that, when exceeded by a torque load on the member of the robot, the output member of the transmission slips relative to the pad.