Rope parallel device based on translation constraint structure

A constrained structure and translational motion technology, applied in manipulators, program-controlled manipulators, manufacturing tools, etc., can solve problems such as increasing manufacturing costs and system complexity, restricting the configuration of cable parallel mechanisms, increasing the number of driving cables, etc. Manufacturing cost and control complexity, avoidance of attitude errors, effects of reducing redundant control requirements

Active Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the rope can only bear tension but not pressure, the configuration of the cable parallel mechanism is subject to many restrictions: 1) In order to ensure that the rope fully constrains the terminal motion, the number of ropes must be greater than the number of terminal degrees of freedom, thus introducing redundant drives and cable force distribution, the control system must include a cable force detection and adjustment module to avoid false pulling of the rope
2) The rope must be pulled in pairs to keep the rope always tensioned
The above-mentioned mechanism is used in translational working conditions, and the redundant rotational degrees of freedom will not only increase the number of driving cables, push up manufacturing costs and system complexity, but also easily introduce terminal attitude errors

Method used

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  • Rope parallel device based on translation constraint structure
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  • Rope parallel device based on translation constraint structure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the space three-translation cable parallel mechanism based on the translation constraint structure consists of a static platform 1, a drum and a driving unit 2, a rope 3, a moving platform 4, a Hooke hinge 5, a ball hinge 6, a rigid rod 7, a spring 8, Intermediate platform 9 constitutes;

[0037] One end of the two rigid rods 7 is connected to the static platform 1 through the Hooke hinge 5, and the other end is connected to the intermediate platform 9 through the Hooke hinge 5, ensuring that the rotation axes of the four Hooke hinges 5 are parallel and the rigid rods 7 are parallel, forming a parallel structure. quadrilateral body. Outside the parallelogram plane, one end of the third rigid rod 7 is connected to the static platform 1 through the ball joint 6, and the other end is connected to the intermediate platform 9 through the ball joint 6, and the three rods 7 are parallel and equal to each other in the initial state. long. At this t...

Embodiment 2

[0040] Such as figure 2 As shown, the parallel mechanism of two translational cables based on the translational restraint structure is composed of a static platform 1, a drum and a driving unit 2, a rope 3, a moving platform 4, a rotary hinge 10, a rigid rod 7, a spring 8, and an intermediate platform 9 ;

[0041] One end of the two rigid rods 7 is connected to the static platform 1 through a rotary hinge 10, and the other end is connected to the intermediate platform 9 through a rotary hinge 10 to ensure that the rotation axes of the four rotary hinges 10 are parallel to each other and the rigid rods 7 are equal in length and parallel to form a parallel structure. quadrilateral body. At this moment, it can be ensured that the intermediate platform 9 is always parallel to the static platform 1 . Similarly, the rotary hinge 10 and the rigid rod 7 are used to connect the moving platform 4 and the intermediate platform 9 to form a planar translation constraint structure to ensur...

Embodiment 3

[0044] Such as image 3 As shown, the parallel mechanism of two translational cables based on the translational restraint structure is composed of a static platform 1, a drum and a driving unit 2, a rope 3, a moving platform 4, a rotary hinge 10, a rigid rod 7, a spring 8, and an intermediate platform 9 ;

[0045] One end of the two rigid rods 7 is connected to the static platform 1 through a rotary hinge 10, and the other end is connected to the intermediate platform 9 through a rotary hinge 10 to ensure that the rotation axes of the four rotary hinges 10 are parallel to each other and the rigid rods 7 are equal in length and parallel to form a parallel structure. quadrilateral body. At this moment, it can be ensured that the intermediate platform 9 is always parallel to the static platform 1 . Similarly, the rotary hinge 10 and the rigid rod 7 are used to connect the moving platform 4 and the intermediate platform 9 to form a planar translation constraint structure to ensu...

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Abstract

The invention discloses a rope parallel device based on a translation constraint structure. The device comprises a static platform, an intermediate platform and a moving platform, wherein rollers and driving units are arranged on the static platform; ropes wind around the rollers and the driving units and are connected with the moving platform; the intermediate platform is connected with the static platform and the moving platform by the aid of rigid rod pieces, each rigid rod piece comprises rigid rods and hinge devices at two ends, and the rigid rods which are equal in length and are parallel constitute parallelogram mechanisms; and springs are connected on diagonal lines of the parallelogram mechanisms and are in the stretched state to provide tension for the ropes. The terminal degree of freedom of a rope parallel mechanism is constrained by the aid of a translation mechanism, and the device inherits the advantages of simple structure, high carrying capacity, easy mounting and dismounting and the like of the rope parallel mechanism and effectively avoids terminal attitude errors, so that the terminal trajectory accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of parallel devices, and relates to a cable parallel device based on a translational restraint structure. Background technique [0002] The research and application of the cable parallel mechanism originated in the late 1980s. It is a special flexible mechanism in the parallel mechanism, and its driving branch chain is a flexible cable. Compared with the rigid rod-supported parallel mechanism, the cable parallel mechanism has the advantages of simple structure, large working space, high load capacity, easy disassembly, reorganization, high degree of modularization and fast movement speed. [0003] However, since the rope can only bear tension but not pressure, the configuration of the cable parallel mechanism is subject to many restrictions: 1) In order to ensure that the rope fully constrains the terminal motion, the number of ropes must be greater than the number of terminal degrees of freedom, thus introd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25J9/00
CPCB25J9/0072
Inventor 邵珠峰唐晓强王立平李彤宇张兆坤李煜琦夏圣悦
Owner TSINGHUA UNIV
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