| 摘要 |
a counterweight arm mechanism having an adjustable dragline tension system capable of adjusting tension; the system comprising a dragline, an extension spring, and a dragline adjustment mechanism; the dragline adjustment mechanism adjusted the overall length of the dragline as a function of the rotation angle of a counterweight arm; the overall length of the dragline including the lengths of the extension spring and the dragline; the dragline length adjustment mechanism being implemented according to the two legs of a right-angled Δ ABC and the property of a+b=2√{square root over (2)}R sin (A+π/4), and in the aforementioned formula, a and b are the sides opposing ∠A and ∠B in the Δ ABC, ∠C is a right angle, R is the circumradius of the right-angled Δ ABC. Using the above-mentioned property of the sum of the two legs of a right-angled triangle, when the two legs are a portion of the dragline of the dragline tension system of the counterweight arm, and when the counterweight arm rotates, the mechanical structure can be used to drive the vertex of the right angle of the right-angled Δ ABC to rotate along with the counterweight arm, and synchronously move in line with the circumcircle of the right-angled Δ ABC, thus the tension on the counterweight arm from the adjustable dragline tension system changes with the rotation angle of the counterweight arm. |
| 主权项 |
1. A counterweight arm mechanism, comprising:
a counterweight arm, a counterweight arm rotating shaft, a the counterweight arm mechanism main frame, a base, and an adjustable dragline tension system; said counterweight arm rotating shaft defined as a horizontal rotating shaft that is perpendicular to the rotation plane of the counterweight arm, configured on the counterweight arm mechanism main frame; said counterweight arm constituted by combining the counterweight arm rotating shaft and the counterweight arm mechanism main frame, said counterweight arm rotating shaft also having a facility to adjust the frictional force, and said the counterweight arm mechanism main frame fixed on the base; said adjustable dragline tension system including a dragline, an extension spring, and a dragline adjusting mechanism; a drive mechanism configured between the adjustable dragline tension system and the counterweight arm; said dragline adjusting mechanism comprising a dragline torque support, a dragline torque support pulley, a dragline adjusting mechanism fixed arm, a dragline adjusting mechanism fixed arm pulley, a dragline adjusting mechanism movable arm, a dragline adjusting mechanism movable arm pulley, and a dragline adjusting mechanism movable arm shaft; said dragline adjusting mechanism movable arm shaft defined as a horizontal rotating shaft parallel to the counterweight arm rotating shaft, and said dragline adjusting mechanism movable arm fixed on the dragline adjusting mechanism movable arm shaft; said dragline torque support, dragline adjusting mechanism fixed arm, and dragline adjusting mechanism movable arm having equal length, and being radially configured with the dragline adjusting mechanism movable arm shaft as the axis, and their terminal positions respectively provided with a dragline torque support pulley, a dragline adjusting mechanism fixed arm pulley, and a dragline adjusting mechanism movable arm pulley, wherein the dragline torque support and the dragline adjusting mechanism fixed arm are fixed on the structure of the counterweight arm mechanism main frame, forming a symmetric linear structure with the dragline adjusting mechanism movable arm shaft as the center; the adjusting mechanism located at the central position of the adjustable dragline tension system, with two ends thereof being the extension spring and the dragline; the dragline turning around the dragline adjusting mechanism fixed arm pulley, the dragline adjusting mechanism movable arm pulley, and the dragline torque support pulley in the dragline adjusting mechanism by sequence; one end of the adjustable dragline tension system connected to the rotary counterweight arm, the other end of the adjustable dragline tension system fixed on the structure of the counterweight arm mechanism main frame, and the extension spring of the adjustable dragline tension system configured on either end of the adjustable dragline tension system; the total length of the dragline and extension spring of the adjustable dragline tension system being adjustable; the dragline adjusting mechanism defined as the adjusting mechanism for the total length of the dragline and extension spring of the adjustable dragline tension system; the tension of the adjustable dragline tension system varied with the adjustment of the total length of the dragline and extension spring by the dragline adjusting mechanism; wherein said dragline adjusting mechanism is a right angle triangle mechanism, and the catheti of the right angle triangle mechanism are made up of part of the dragline, respectively being the dragline between the dragline adjusting mechanism fixed arm pulley and the dragline adjusting mechanism movable arm pulley and the dragline between the dragline torque support pulley and the dragline adjusting mechanism movable arm pulley; said dragline adjusting mechanism movable arm shaft is the center of the circumscribed circle of the right angle triangle mechanism of the dragline adjusting mechanism; the hypotenuse of the right angle triangle mechanism of the dragline adjusting mechanism is the diameter of the circumscribed circle; the hypotenuse is made up of the dragline torque support and the dragline adjusting mechanism fixed arm; the dragline torque support and the dragline adjusting mechanism fixed arm are in a symmetric linear arrangement with the center of the circumscribed circle of the right angle triangle mechanism as the symmetric center; wherein said dragline adjusting mechanism movable arm is fixed on the dragline adjusting mechanism movable arm shaft; the relative positions of the dragline adjusting mechanism movable arm and the counterweight arm are: when the counterweight arm stays at the horizontal position, the dragline adjusting mechanism movable arm is perpendicular to the hypotenuse of the right angle triangle mechanism of the dragline adjusting mechanism, i.e., when the counterweight arm stays at the horizontal position, the dragline adjusting mechanism movable arm is perpendicular to the linear structure integrating the dragline torque support and the dragline adjusting mechanism fixed arm, so that the right angle triangle mechanism of the dragline adjusting mechanism forms an isosceles right angle triangle; wherein said dragline adjusting mechanism movable arm pulley is located at the right angle vertex of the right angle triangle mechanism; the dragline adjusting mechanism movable arm can rotate with the counterweight arm for an equal angle; when the dragline adjusting mechanism movable arm rotates, the dragline adjusting mechanism movable arm pulley moves on part of the circular arc of the circumscribed circle of the right angle triangle mechanism. |
