CN212825379U - Three-branch parallel mechanism with two operation modes - Google Patents
Three-branch parallel mechanism with two operation modes Download PDFInfo
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- CN212825379U CN212825379U CN202021645460.7U CN202021645460U CN212825379U CN 212825379 U CN212825379 U CN 212825379U CN 202021645460 U CN202021645460 U CN 202021645460U CN 212825379 U CN212825379 U CN 212825379U
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Abstract
The utility model relates to a robotechnology field. The three-branch parallel mechanism with two operation modes has the advantages of high movement speed, high rigidity, high load capacity, good dynamic performance, multiple operation modes and the like. The technical scheme is as follows: a three-branch parallel mechanism having two modes of operation, characterized by: the mechanism comprises a rack, a movable platform, a first branch and two second branches, wherein the first branch and the two second branches are connected between the rack and the movable platform in parallel; the first branch comprises a first moving pair guide rail, a first moving pair sliding block, a first upper hook hinge, a first connecting rod and a first lower hook hinge which are sequentially connected between the rack and the moving platform; the first rotating shaft axis of the first upper hook joint is parallel to the first rotating shaft axis of the first lower hook joint, and the second rotating shaft axis of the first lower hook joint is vertical to the first rotating shaft axis of the first lower hook joint; the first moving pair axis is perpendicular to the second rotating shaft axis of the first upper Hooke hinge.
Description
Technical Field
The utility model relates to the technical field of robot, specifically a three-branch parallel mechanism with two mode of operation.
Background
The parallel mechanism refers to a closed-loop mechanism formed by connecting a movable platform (end effector) and a fixed platform (fixed frame) through two or more kinematic chains. Compared with the traditional serial mechanism, the parallel mechanism has better precision, rigidity, load capacity, dynamic performance and the like, and is increasingly used in the fields of motion simulation, sorting and grabbing, parallel machine tools and the like. The parallel mechanism with less freedom degrees, namely the parallel mechanism with less than six freedom degrees, has the advantages of low manufacturing cost, simple structure, easy control and the like, and is deeply researched by vast scholars at home and abroad.
With the rapid development of modern technology, many modern production processes require a mechanism to have multiple functions and multiple operation modes. The existing three-degree-of-freedom parallel mechanism utility model published patents (such as CN111113384A and CN110480604A) only have a single working mode and cannot meet the requirements in the modern production field. Therefore, it is necessary to provide a three-branch parallel mechanism with two modes of operation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above-mentioned background art, provide a three-branch parallel mechanism with two mode of operation, this mechanism has that the rate of motion is fast, rigidity is high, load capacity is big, the dynamics can be good, have advantages such as a plurality of mode of operation.
The utility model provides a technical scheme is:
a three-branch parallel mechanism having two modes of operation, characterized by: the mechanism comprises a rack, a movable platform, a first branch and two second branches, wherein the first branch and the two second branches are connected between the rack and the movable platform in parallel;
the first branch comprises a first moving pair guide rail, a first moving pair sliding block, a first upper hook hinge, a first connecting rod and a first lower hook hinge which are sequentially connected between the rack and the moving platform; the first rotating shaft axis of the first upper hook joint is parallel to the first rotating shaft axis of the first lower hook joint, and the second rotating shaft axis of the first lower hook joint is vertical to the first rotating shaft axis of the first lower hook joint; the axis of the first moving pair is vertical to the axis of a second rotating shaft of the first upper Hooke hinge;
the second branch comprises a second moving pair guide rail, a second moving pair sliding block, a second rotating pair, a second connecting rod and a second hook hinge which are sequentially connected between the rack and the moving platform; or the second branch comprises a second sliding pair guide rail, a second sliding pair sliding block, a second rotating pair, a second connecting rod and a second ball pair which are sequentially connected between the rack and the movable platform; the first rotating shaft axis of the second hook joint is parallel to the rotating shaft axis of the second revolute pair; the second moving pair axis is perpendicular to the rotating shaft axis of the second rotating pair.
The two second branches are arranged symmetrically to the first branch; in the two second branches, the axes of the rotating shafts of the two second revolute pairs are parallel, and the axes of the second rotating shafts of the two second hooke joints are collinear; the second rotating shaft axis of the first upper hook hinge is parallel to the rotating shaft axis of the second rotating pair; two second moving pair axes in the two second branches are parallel to the first moving pair axis of the first branch.
A three-branch parallel mechanism having two modes of operation, characterized by: the mechanism comprises a rack, a movable platform, a third branch and two fourth branches, wherein the third branch and the two fourth branches are connected between the rack and the movable platform in parallel;
the third branch comprises a third upper hook hinge, a third sliding pair sleeve, a third sliding pair sliding rod and a third lower hook hinge, wherein the third upper hook hinge, the third sliding pair sliding sleeve, the third sliding pair sliding rod and the third lower hook hinge are sequentially connected between the rack and the movable platform; the first rotating shaft axis of the third upper Hooke joint is parallel to the first rotating shaft axis of the third lower Hooke joint and is perpendicular to the third moving pair axis;
the fourth branch comprises a fourth revolute pair, a fourth sliding sleeve of the sliding pair, a fourth sliding slide bar of the sliding pair and a fourth hook hinge, wherein the fourth revolute pair and the fourth sliding sleeve of the sliding pair are sequentially connected between the rack and the movable platform; or the fourth branch comprises a fourth revolute pair, a fourth sliding sleeve of the sliding pair, a fourth sliding slide of the sliding pair and a fourth ball pair, wherein the fourth revolute pair and the fourth sliding sleeve of the sliding pair are sequentially connected between the rack and the moving platform; the rotating shaft axis of the fourth rotating pair is parallel to the first rotating shaft axis of the fourth Hooke hinge and is perpendicular to the fourth moving pair axis.
The two fourth branches are arranged symmetrically to the third branch; in the two fourth branches, the axes of the rotating shafts of the two fourth revolute pairs are parallel, and the axes of the second rotating shafts of the two fourth hooke joints are collinear; and a second rotating shaft axis of a third upper Hooke hinge in the third branch is parallel to a rotating shaft axis of a fourth rotating pair in the fourth branch.
The utility model has the advantages that: the utility model provides a parallel mechanism has a plurality of mode of operation, and the moving speed is fast, rigidity is high, load capacity is big, advantages such as dynamic performance is good, can be used to require the mechanism to have multi-functional, many mode of operation's production field.
Drawings
Fig. 1 is a schematic perspective view of a first embodiment of the present invention.
Fig. 2 is a schematic perspective view of a second embodiment of the present invention.
Fig. 3 is a schematic perspective view of a third embodiment of the present invention.
Fig. 4 is a schematic perspective view of a fourth embodiment of the present invention.
Fig. 5 is a schematic perspective view of a first branch in the first and second embodiments of the present invention.
Fig. 6 is a schematic perspective view of a second branch according to a first embodiment of the present invention.
Fig. 7 is a schematic perspective view of a second branch according to a second embodiment of the present invention.
Fig. 8 is a schematic perspective view of a third branch in a third embodiment and a fourth embodiment of the present invention.
Fig. 9 is a schematic perspective view of a fourth branch in the third embodiment of the present invention.
Fig. 10 is a schematic perspective view of a fourth branch according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments shown in the drawings, but the present invention is not limited to the following embodiments.
Example one
The three-branch parallel mechanism with two operation modes as shown in fig. 1, 5 and 6 comprises a frame (omitted in the figures), a movable platform 1 and a first branch and two second branches connected between the frame and the movable platform in parallel.
The first branch comprises a first moving pair guide rail 11, a first moving pair sliding block 12 (namely the first moving pair guide rail and the first moving pair sliding block are matched to form a first moving pair), a first upper hook hinge 13, a first connecting rod 14 and a first lower hook hinge 15 which are sequentially connected between the rack and the moving platform.
The first moving pair guide rail is fixedly connected with the rack, a first rotating shaft axis 16 of the first upper hook joint (namely, a rotating shaft axis of the first upper hook joint connected with the first connecting rod) is parallel to a first rotating shaft axis 17 of the first lower hook joint (namely, a rotating shaft axis of the first lower hook joint connected with the first connecting rod), a second rotating shaft axis of the first upper hook joint (namely, a rotating shaft axis of the first upper hook joint connected with the first moving pair sliding block) is vertical to the first rotating shaft axis of the first upper hook joint, and a second rotating shaft axis of the first lower hook joint (namely, a rotating shaft axis of the first lower hook joint connected with the moving platform) is vertical to the first rotating shaft axis of the first lower hook joint. The first moving pair axis is perpendicular to the second rotating shaft axis of the first upper hook joint (namely the rotating shaft axis of the first upper hook joint connected with the first moving pair sliding block).
The second branch comprises a second moving pair guide rail 21, a second moving pair sliding block 22 (the second moving pair guide rail and the second moving pair sliding block form a second moving pair), a second revolute pair 23, a second connecting rod 24 and a second hook joint 25 which are sequentially connected between the rack and the moving platform. The second sliding pair guide rail is fixedly connected with the rack, and a first rotating shaft axis of the second hook joint (namely a rotating shaft axis of the second hook joint connected with the second connecting rod) is parallel to a rotating shaft axis of the second sliding pair; a second rotating shaft axis of the second hook joint (namely the rotating shaft axis of the second hook joint connected with the movable platform) is vertical to the first rotating shaft axis of the second hook joint; the axis of the rotating shaft of the second rotating pair is vertical to the axis of the second moving pair.
The two second branches are arranged symmetrically to the first branch. In the two second branches, the axes of the rotating shafts of the two second revolute pairs are parallel, and the axes of the second rotating shafts of the two second hooke joints are collinear. And the second rotating shaft axis of the first upper Hooke's hinge is parallel to the rotating shaft axis of the second rotating pair. The second moving pair axes of the two second branches are parallel to the first moving pair axis of the first branch.
When the first hook is in the initial position, the second rotating shaft axis of the first upper hook is parallel to the second rotating shaft axis of the first lower hook, and the first rotating shaft axis of the first upper hook is parallel to the second rotating shaft axis of the second hook.
In this embodiment, the driving pair is a revolute pair formed by connecting three moving pairs on three branches and a first upper hooke joint and a first moving pair sliding block. The driving method of the sliding pair can be a ball screw driven by a motor (the prior art is omitted in the figure), and the driving method of the rotating pair can be a servo motor (the figure is omitted). From the initial position, by appropriately controlling the movement of the driving pair, the parallel mechanism can enter two three-degree-of-freedom operation modes, namely a two-movement-one-rotation operation mode and a one-movement-two-rotation operation mode.
Example two
The three-branch parallel mechanism with two operation modes as shown in fig. 2, 5 and 7 comprises a frame (omitted in the figure), a movable platform 1 and a first branch and two second branches connected between the frame and the movable platform in parallel. The second embodiment has a similar structure to the first embodiment, except that: in the second embodiment, the second link is connected with the movable platform through the second ball pair 26. When the two spherical pairs are in the initial position, the second rotating shaft axis of the first upper Hooke joint is parallel to the second rotating shaft axis of the first lower Hooke joint, and the connecting line of the centers of the two spherical pairs in the two second branches is parallel to the first rotating pair axis of the first upper Hooke joint.
EXAMPLE III
The three-branch parallel mechanism with two operation modes as shown in fig. 3, 8 and 9 comprises a frame (omitted in the figure), a movable platform 1 and a third branch and two fourth branches connected between the frame and the movable platform in parallel;
the third branch comprises a third upper hook hinge 33, a third sliding pair sleeve 34, a third sliding pair sliding rod 35 (the third sliding pair is formed by the third sliding pair sleeve and the third sliding pair sliding rod) and a third lower hook hinge 36, which are sequentially connected between the frame and the movable platform. The front hinge seat 31 and the rear hinge seat 32 of the third upper hook joint are fixedly connected with the rack, and the first rotating shaft axis 37 of the third upper hook joint (namely, the rotating shaft axis of the third upper hook joint connected with the third sliding pair sleeve) is parallel to the first rotating shaft axis 38 of the third lower hook joint (namely, the rotating shaft axis of the third lower hook joint connected with the third sliding pair sliding rod) and is perpendicular to the third sliding pair axis; and a second rotating shaft axis of the third upper hook joint (namely a rotating shaft axis of the third upper hook joint connected with the rack) is vertical to the first rotating shaft axis of the third upper hook joint. And a second rotating shaft axis of the third lower hooke joint (namely a rotating shaft axis of the third lower hooke joint connected with the movable platform) is vertical to the first rotating shaft axis of the third lower hooke joint.
The fourth branch comprises a fourth revolute pair 47 (comprising a front supporting seat 41, a rear supporting seat 42 and a rotating shaft matched with the front supporting seat and the rear supporting seat) connected between the rack and the moving platform in sequence, a fourth sliding pair sleeve 43, a fourth sliding pair slide bar 44 (comprising a fourth sliding pair sleeve and a fourth sliding pair slide bar) connected to the fourth sliding pair sliding sleeve in a sliding manner, and a fourth hooke hinge 45. Wherein, the fourth sliding sleeve is connected to the frame through the rotating shaft and the front support base 41 and the rear support base 42. The axis of the rotating shaft of the fourth rotating pair is parallel to the first axis of the rotating shaft of the fourth hook joint (namely the axis of the rotating shaft of the fourth hook joint connected with the sliding rod of the fourth moving pair) and is perpendicular to the axis of the fourth moving pair; and a second rotating shaft axis of the fourth hook joint (namely the rotating shaft axis of the fourth hook joint connected with the movable platform) is vertical to the first rotating shaft axis of the fourth hook joint.
The two fourth branches are arranged symmetrically to the third branch. In the two fourth branches, the axes of the rotating shafts of the two fourth revolute pairs are parallel, and the axes of the second rotating shafts of the two fourth hooke joints are collinear; and a second rotating shaft axis of a third upper Hooke hinge in the third branch is parallel to a rotating shaft axis of a fourth rotating pair in the fourth branch.
When the first hook is in the initial position, the second rotating shaft axis of the third upper hook is parallel to the second rotating shaft axis of the third lower hook, and the first rotating shaft axis of the third upper hook is parallel to the second rotating shaft axis of the fourth hook.
In this embodiment, the driving pair is a revolute pair formed by connecting three moving pairs on three branches and a third upper hooke joint with the frame. The driving method of the sliding pair can be a ball screw driven by a motor (the prior art is omitted in the figure), and the driving method of the rotating pair can be a servo motor (the figure is omitted). From the initial position, by appropriately controlling the movement of the driving pair, the parallel mechanism can enter two three-degree-of-freedom operation modes, namely a two-movement-one-rotation operation mode and a one-movement-two-rotation operation mode.
Example four
The three-branch parallel mechanism with two operation modes as shown in fig. 4, 8 and 10 comprises a frame (omitted in the figure), a movable platform 1 and a third branch and two fourth branches connected in parallel between the frame and the movable platform. The fourth embodiment has a similar structure to the third embodiment, except that: in the fourth embodiment, the fourth sliding pair sliding rod is connected with the movable platform through a fourth ball pair 46. When the first rotary shaft of the first upper hook joint is in an initial position, the axis of the first rotary shaft of the first upper hook joint is parallel to the axis of the first rotary shaft of the first lower hook joint, and the connecting line of the centers of the two spherical pairs in the two first branches is parallel to the axis of the first rotary pair of the first upper hook joint.
Claims (4)
1. A three-branch parallel mechanism having two modes of operation, characterized by: the mechanism comprises a rack, a movable platform (1), and a first branch and two second branches which are connected in parallel between the rack and the movable platform;
the first branch comprises a first moving pair guide rail (11), a first moving pair sliding block (12), a first upper Hooke joint (13), a first connecting rod (14) and a first lower Hooke joint (15) which are sequentially connected between the rack and the moving platform; a first rotating shaft axis (16) of the first upper Hooke joint is parallel to a first rotating shaft axis (17) of the first lower Hooke joint, and a second rotating shaft axis of the first lower Hooke joint is vertical to the first rotating shaft axis of the first lower Hooke joint; the axis of the first moving pair is vertical to the axis of a second rotating shaft of the first upper Hooke hinge;
the second branch comprises a second sliding pair guide rail (21), a second sliding pair sliding block (22), a second revolute pair (23), a second connecting rod (24) and a second hook hinge (25) which are sequentially connected between the rack and the movable platform; or the second branch comprises a second sliding pair guide rail (21), a second sliding pair sliding block (22), a second rotating pair (23), a second connecting rod (24) and a second ball pair (26) which are sequentially connected between the rack and the moving platform; the first rotating shaft axis of the second hook joint is parallel to the rotating shaft axis of the second revolute pair; the second moving pair axis is perpendicular to the rotating shaft axis of the second rotating pair.
2. A three-branch parallel mechanism having two modes of operation according to claim 1, wherein: the two second branches are arranged symmetrically to the first branch; in the two second branches, the axes of the rotating shafts of the two second revolute pairs are parallel, and the axes of the second rotating shafts of the two second hooke joints are collinear; the second rotating shaft axis of the first upper hook hinge is parallel to the rotating shaft axis of the second rotating pair; two second moving pair axes in the two second branches are parallel to the first moving pair axis in the first branch.
3. A three-branch parallel mechanism having two modes of operation, characterized by: the mechanism comprises a rack, a movable platform (1), a third branch and two fourth branches, wherein the third branch and the two fourth branches are connected between the rack and the movable platform in parallel;
the third branch comprises a third upper hook hinge (33), a third sliding pair sleeve (34), a third sliding pair sliding rod (35) and a third lower hook hinge (36), wherein the third upper hook hinge (33), the third sliding pair sliding sleeve (34), the third sliding pair sliding rod (35) and the third lower hook hinge are sequentially connected between the rack and the movable platform (1); the first rotating shaft axis (37) of the third upper Hooke joint is parallel to the first rotating shaft axis (38) of the third lower Hooke joint and is perpendicular to the third moving pair axis;
the fourth branch comprises a fourth revolute pair (47), a fourth sliding pair sleeve (43), a fourth sliding pair sliding rod (44) and a fourth hook hinge (45), wherein the fourth revolute pair and the fourth sliding pair sliding sleeve are sequentially connected between the rack and the movable platform; or the fourth branch comprises a fourth revolute pair (47), a fourth sliding pair sleeve (43), a fourth sliding pair sliding rod (44) and a fourth ball pair (46), wherein the fourth revolute pair, the fourth sliding pair sliding sleeve (43), the fourth sliding pair sliding rod (44) and the fourth ball pair are sequentially connected between the rack and the movable platform; the rotating shaft axis of the fourth rotating pair is parallel to the first rotating shaft axis of the fourth Hooke hinge and is perpendicular to the fourth moving pair axis.
4. A three-branch parallel mechanism having two modes of operation according to claim 3, wherein: the two fourth branches are arranged symmetrically to the third branch; in the two fourth branches, the axes of the rotating shafts of the two fourth revolute pairs are parallel, and the axes of the second rotating shafts of the two fourth hooke joints are collinear; and a second rotating shaft axis of a third upper Hooke hinge in the third branch is parallel to a rotating shaft axis of a fourth rotating pair in the fourth branch.
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| CN202021645460.7U CN212825379U (en) | 2020-08-10 | 2020-08-10 | Three-branch parallel mechanism with two operation modes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111923025A (en) * | 2020-08-10 | 2020-11-13 | 浙江理工大学 | Three-branch parallel mechanism with two operation modes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111923025A (en) * | 2020-08-10 | 2020-11-13 | 浙江理工大学 | Three-branch parallel mechanism with two operation modes |
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