CN201389855Y - Parallel mechanism with three freedom degree of two-rotation and one-shifting - Google Patents
Parallel mechanism with three freedom degree of two-rotation and one-shifting Download PDFInfo
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- CN201389855Y CN201389855Y CN200920117054U CN200920117054U CN201389855Y CN 201389855 Y CN201389855 Y CN 201389855Y CN 200920117054 U CN200920117054 U CN 200920117054U CN 200920117054 U CN200920117054 U CN 200920117054U CN 201389855 Y CN201389855 Y CN 201389855Y
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Abstract
The utility model relates to a parallel mechanism with three freedom degree of two-rotation and one-shifting, which is characterized in that the kinematics model is simple, and the mechanism is easily controlled and has simple structure, high rigidity and low manufacturing cost. The utility model adopts the technical solution that the parallel mechanism comprises a parallel mechanism with three degree freedom of two-rotation and one-shifting, a movable platform, a framework, a first, a second and a third branches which are connected in parallel between the movable platform and the framework, in the three branches, each of the branches is orderly connected with a first single-degree-of-freedom kinematic pair, a second single-degree-of-freedom kinematic pair and a universal hinge from the framework to the movable platform, wherein a rotating pair is further added between the second single-degree-of-freedom kinematic pair and the universal hinge in the third branch, the axial cords of first rotation shafts of the two universal hinges in the first and the second branches are parallel to each other, the central points of three universal hinges in the three branches share the same line, the axial cord of the first rotation shaft of the universal hinge in the third branch is vertical to or parallel to the axial cords of the first rotation shafts of the two universal hinges in the first and the second branches.
Description
Technical field
The utility model relates to a kind of robot mechanism, particularly a kind of parallel institution with two commentaries on classics, one shift three degrees of freedom.
Background technology:
It is the focus that present international parallel robot academia and industrial quarters are paid close attention to that the institution freedom number of degrees are less than 6 lower-mobility parallel robot.Have the desired number of degrees of freedom, of a considerable amount of operation tasks to be less than 6 in actual applications, use suitable lower-mobility parallel robot this moment, and saving system effectively designs, makes, controls and safeguard the cost of aspect.
3DOF parallel institution with two rotational freedoms and one-movement-freedom-degree (being called for short 2 commentaries on classics 1 moves) is the very important class of lower-mobility parallel manipulator philtrum.3-PRS/RPS class parallel institution is that two typical cases that change a shift three degrees of freedom parallel institution represent, and the main shaft that is used as telescope focusing arrangement, motion simulator, microoperation manipulator, coordinate measuring machine, machining center is first-class.
All there is the kinematics model complicated problems in disclosed two commentaries on classics one shift three degrees of freedom parallel institutions (as US6431802, WO0025976, ZL200610013608.3, EP1123175, CA2349579, DE59905578D, ES2198991T, ZL200710057179.4), causes real-time control, demarcates difficulty on the existing publication.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of two to change a shift three degrees of freedom parallel institution, and it is simple that this mechanism has a kinematics model, is easy to control, and is simple in structure, rigidity is high, the characteristics of low cost of manufacture.
The technical scheme that the utility model provides is:
Have two parallel institutions that change a shift three degrees of freedom, comprise moving platform, frame and be connected in moving platform in parallel and frame between first, second and the 3rd branch; It is characterized in that described the 3rd branch is connected with the first single dof mobility pair, the second single dof mobility pair, revolute pair and universal hinge in turn from the frame to the moving platform, in described first branch, second branch, each branch is connected with the first single dof mobility pair in turn from the frame to the moving platform, second single dof mobility is secondary and universal hinge; Universal in described first branch is hinged the revolute pair axis of moving platform and the universal revolute pair axis that is hinged moving platform in second branch is parallel to each other; The universal hinge central point in first branch and the line of the universal hinge central point in second branch are through the universal hinge central point in the 3rd branch, and the universal revolute pair axis that is hinged moving platform is vertical or parallel to two universal revolute pair axis that are hinged moving platform in first branch, second branch in the 3rd branch.
The first single dof mobility pair, the second single dof mobility pair in first branch are respectively moving sets and revolute pair, the first single dof mobility pair, the second single dof mobility pair in second branch are respectively moving sets and revolute pair, first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively moving sets and revolute pair, and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis; Perhaps, the first single dof mobility pair, the second single dof mobility pair in first branch are respectively revolute pair and moving sets, the first single dof mobility pair, the second single dof mobility pair in second branch are respectively revolute pair and moving sets, first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively revolute pair and moving sets, and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis.
The first single dof mobility pair, the second single dof mobility pair in first branch are respectively revolute pair and revolute pair, the universal axis normal that is hinged the revolute pair of moving platform in the axis of revolute pair and revolute pair and the same branch; The first single dof mobility pair, the second single dof mobility pair in second branch are respectively revolute pair and revolute pair, the universal axis normal that is hinged the revolute pair of moving platform in the axis of revolute pair and revolute pair and the same branch; The first single dof mobility pair, the second single dof mobility pair in the 3rd branch are respectively revolute pair and revolute pair; And revolute pair axis and revolute pair axis in the described same branch are parallel to each other.
Also increase by a revolute pair between first branch, second single dof mobility pair and the universal hinge, second single dof mobility in second branch secondary with universal hinge between also increase by a revolute pair, the revolute pair axis of each branch's increase is vertical with the universal revolute pair axis that is hinged moving platform in the same branch respectively; Second rotating shaft in the universal hinge of first branch is coaxial with second rotating shaft in the second branch universal hinge.
Have at least one to be active moving sets or active rotation pair in the single dof mobility pair in each branch, initiatively the driving mechanism of moving sets is the screw mechanism of driven by motor, or linear electric motors, the driving mechanism of active rotation pair is the reductor of driven by motor.
Have two parallel institutions that change a shift three degrees of freedom, first, second and the 3rd branch that comprise moving platform, frame and connect moving platform and frame; It is characterized in that wherein from the frame to the moving platform, being connected with the first single dof mobility pair, second single dof mobility pair and the ball pivot in turn in first branch, from the frame to the moving platform, be connected with the first single dof mobility pair, second single dof mobility pair and the ball pivot in second branch in turn; The 3rd branch is connected with the first single dof mobility pair, the second single dof mobility pair, revolute pair and universal hinge in turn from the frame to the moving platform; Ball pivot central point in described first branch and the line between the ball pivot central point in second branch are through the central point of universal hinge in the 3rd branch.
First single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively moving sets and revolute pair; First single dof mobility pair and the second single dof mobility pair in described first branch are respectively moving sets and revolute pair, first single dof mobility pair and the second single dof mobility pair in second branch are respectively moving sets and revolute pair, and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis, perhaps
First single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair and moving sets, first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair and moving sets, and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis, perhaps
First single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair and revolute pair, first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair and revolute pair, and two revolute pair axis in the described same branch are parallel to each other.
First single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair and moving sets, first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair and moving sets, first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively revolute pair and moving sets, and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis.
Have at least one to be active moving sets or active rotation pair in the single dof mobility pair in each branch, initiatively the driving mechanism of moving sets is the screw mechanism of driven by motor, or linear electric motors, the driving mechanism of active rotation pair is the reductor of driven by motor.
But two rotational freedoms and an one-movement-freedom-degree of the utility model implementation space, one of them rotational freedom is that the line of moving platform two universal hinge central points that can link to each other with moving platform in first, second branch rotates, cross the universal hinge central point that the 3rd branch links to each other with moving platform but another rotational freedom is the moving platform pile warp, and the straight line parallel with rotation secondary axis in first, second branch rotates; One-movement-freedom-degree is that moving platform can be moved in vertical direction.Its kinematics model is simple, is easy to control, demarcates; In addition because simple and reliable for structure, rigidity is high, manufacturing cost is minimized,, can be applicable to occasions such as parallel robot, parallel machine.
Description of drawings
Fig. 1 is the perspective view of the utility model embodiment 1.
Fig. 2 is the perspective view of the utility model embodiment 2.
Fig. 3 is the perspective view of the utility model embodiment 3.
Fig. 4 is the perspective view of the utility model embodiment 4.
Fig. 5 is the perspective view of the utility model embodiment 5.
Fig. 6 is the perspective view of the utility model embodiment 6.
Fig. 7 is the perspective view of the utility model embodiment 7.
Fig. 8 is the perspective view of the utility model embodiment 8.
Fig. 9 is the perspective view of the utility model embodiment 9.
Figure 10 is the perspective view of the utility model embodiment 10.
Figure 11 is the structure diagram of the universal hinge among each embodiment of the utility model.
Among the figure: 11-frame, 21-frame, 31-frame, 4-moving platform;
In first branch: 12-moving sets, 13-connecting rod, 14-revolute pair, 15-connecting rod, 16-revolute pair, the 17-connecting rod, the universal hinge of 18-, first rotating shaft of the universal hinge 18 of 18a-, second rotating shaft of the universal hinge 18 of 18b-, 111-revolute pair, the 112-connecting rod, 113-moving sets, 114-connecting rod, 116-revolute pair;
In second branch: 22-moving sets, 23-connecting rod, 24-revolute pair, 25-connecting rod, 26-revolute pair, the 27-connecting rod, the universal hinge of 28-, first rotating shaft of the universal hinge 28 of 28a-, second rotating shaft of the universal hinge 28 of 28b-, 211-revolute pair, the 212-connecting rod, 213-moving sets, 214-connecting rod, 216-revolute pair;
In the 3rd branch: 32-moving sets, 33-connecting rod, 34-revolute pair, 35-connecting rod, 36-revolute pair, the 37-connecting rod, the universal hinge of 38-, first rotating shaft of the universal hinge 38 of 38a-, second rotating shaft of the universal hinge 38 of 38b-, 311-revolute pair, the 312-connecting rod, 313-moving sets, 314-connecting rod, 316-revolute pair.
The specific embodiment
Further specify below in conjunction with embodiment shown in the drawings.
Below among each embodiment, the axis of two revolute pairs in the universal hinge of described each branch is vertical mutually and intersect; The central point of described universal hinge is the intersection point of two revolute pair axis in the universal hinge; First rotating shaft in described universal hinge 18, universal hinge 28 and the universal hinge 38 is revolute pair 18a, revolute pair 28a and the revolute pair 38a that universal hinge directly connects moving platform respectively; Second rotating shaft in universal hinge 18, universal hinge 28 and the universal hinge 38 (being revolute pair 18b, revolute pair 28b and revolute pair 38b) then with each branch in secondary connection of second single dof mobility, or be connected with second single dof mobility pair in each branch by a revolute pair; Described moving sets axis is meant the straight line parallel with the direction of motion of moving sets, and the revolute pair axis is meant and centers on the center line that rotates when revolute pair is rotated.In addition, have at least one to be active moving sets or active rotation pair in the single dof mobility pair in each branch, the driving mechanism of described active moving sets is the screw mechanism of driven by motor, or linear electric motors, and the driving mechanism of active rotation pair is the reductor of driven by motor.The above is the conventional design of general robot mechanism.
Embodiment 1:
As shown in Figure 1, moving platform 4 is by three branch and frames 11 that structure is identical, 21 are connected with 31, moving sets 12 in the branch, 22,32 be not parallel to each other and respectively with frame 11,21 are connected with 31, connecting rod 13,23, an end of 33 respectively with moving sets 12,22,32 connect, connecting rod 13,23,33 the other end respectively with revolute pair 14,24,34 connect, and revolute pair 14,24,34 axis respectively with moving sets 12,22,32 axis normal, connecting rod 15,25, an end of 35 respectively with revolute pair 14,24,34 connect, connecting rod 15,25,35 the other end respectively with revolute pair 16,26,36 connect, connecting rod 17,27, an end of 37 respectively with revolute pair 16,26,36 connect, connecting rod 17,27,37 the other end respectively with universal hinge 18,28, second rotating shaft 18b of 38,28b, 38b connects, moving platform 4 respectively with universal hinge 18,28, first rotating shaft 18a of 38,28a, 38a connects; First rotating shaft 18a of universal hinge 18, first rotating shaft 28a of universal hinge 28 be perpendicular to the plane of moving platform, second rotating shaft 18b of universal hinge 18 and second coaxial coincidence of rotating shaft 28b of universal hinge 28, and be parallel to the plane of moving platform; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of the 3rd branch first revolute pair 34, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 18 (intersection point of rotating shaft 18a and 18b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 28 (intersection point of rotating shaft 28a and 28b) and universal hinge 38 is on same straight line.
Embodiment 2:
As shown in Figure 2, moving platform 4 is by three branch and frames 11 that structure is identical, 21 are connected with 31, revolute pair 111,211,311 respectively with frame 11,21 are connected with 31, connecting rod 112,212,312 1 ends respectively with revolute pair 111,211,311 connect, connecting rod 112,212,312 other ends respectively with moving sets 113,213,313 connect, connecting rod 114,214, an end of 314 respectively with moving sets 113,213,313 connect, connecting rod 114,214,314 the other end respectively with revolute pair 16,26,36 connect, connecting rod 17,27, an end of 37 respectively with revolute pair 16,26,36 connect, connecting rod 17,27,37 the other end respectively with universal hinge 18,28, second rotating shaft 18b of 38,28b, 38b connects, moving platform 4 respectively with universal hinge 18,28, first rotating shaft 18a of 38,28a, 38a connects; First rotating shaft 18a of universal hinge 18, first rotating shaft 28a of universal hinge 28 is perpendicular to the plane of moving platform, second rotating shaft 18b of universal hinge 18 and second coaxial coincidence of rotating shaft 28b of universal hinge 28, and the plane that is parallel to moving platform, first rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 18 (intersection point of rotating shaft 18a and 18b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 28 (intersection point of rotating shaft 28a and 28b) and universal hinge 38 is on same straight line.
Embodiment 3:
As shown in Figure 3, moving platform 4 is by three branch and frames 11 that structure is identical, 21 are connected with 31, revolute pair 111,211,311 respectively with frame 11,21 are connected with 31, connecting rod 112,212,312 1 ends respectively with revolute pair 111,211,311 connect, connecting rod 112,212,312 other ends respectively with revolute pair 116,216,316 connect, connecting rod 15,25, an end of 35 respectively with revolute pair 116,216,316 connect, connecting rod 15,25,35 the other end respectively with revolute pair 16,26,36 connect, connecting rod 17,27, an end of 37 respectively with revolute pair 16,26,36 connect, connecting rod 17,27,37 the other end respectively with universal hinge 18,28, second rotating shaft 18b of 38,28b, 38b connects, moving platform 4 respectively with universal hinge 18,28, first rotating shaft 18a of 38,28a, 38a connects; First rotating shaft 18a of universal hinge 18, first rotating shaft 28a of universal hinge 28 is perpendicular to the plane of moving platform, second rotating shaft 18b of universal hinge 18 and second coaxial coincidence of rotating shaft 28b of universal hinge 28, and the plane that is parallel to moving platform, first rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 18 (intersection point of rotating shaft 18a and 18b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 28 (intersection point of rotating shaft 28a and 28b) and universal hinge 38 is on same straight line.
Embodiment 4:
As shown in Figure 4, moving platform 4 is by three branches and frame 11,21,31 connect, moving sets 12 in the branch, 22,32 be not parallel to each other and respectively with frame 11,21,31 connect, connecting rod 13,23, an end of 33 respectively with moving sets 12,22,32 connect, connecting rod 13,23,33 the other end respectively with revolute pair 14,24,34 connect, and revolute pair 14,24,34 axis respectively with moving sets 12,22,32 axis normal, connecting rod 15,25, an end of 35 respectively with revolute pair 14,24,34 connect, connecting rod 15,25 the other end respectively with ball pivot 19,29 connect, the other end of connecting rod 35 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38, moving platform 4 respectively with ball pivot 19,29 are connected with first rotating shaft 38a of universal hinge 38; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 34, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The centre of sphere of ball pivot 19, the central point of the centre of sphere of ball pivot 29 and universal hinge 38 (intersection point of rotating shaft 38a and 38b) is on same straight line.
Embodiment 5:
As shown in Figure 5, moving platform 4 is connected with 31 by three branches and frame 11,21, revolute pair 111,211 is connected with frame 11,21 respectively, connecting rod 112,212 1 ends are connected with revolute pair 111,211 respectively, connecting rod 112,212 other ends are connected with moving sets 113,213 respectively, one end of connecting rod 114,214 is connected with moving sets 113,213 respectively, and the other end of connecting rod 114,214 is connected with ball pivot 19,29 respectively; Moving sets 32 is connected with frame 31 in the branch, one end of connecting rod 33 is connected with moving sets 32, the other end of connecting rod 33 is connected with revolute pair 34 and the axis of revolute pair 34 and the axis normal of moving sets 32, one end of connecting rod 35 is connected with revolute pair 34, the other end of connecting rod 35 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38, and moving platform 4 is connected with first rotating shaft 38a of ball pivot 19,29 and universal hinge 38 respectively; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The centre of sphere of ball pivot 19, the central point of the centre of sphere of ball pivot 29 and universal hinge 38 (intersection point of rotating shaft 38a and 38b) is on same straight line.
Embodiment 6:
As shown in Figure 6, moving platform 4 is by three branches and frame 11,21 are connected with 31, revolute pair 111,211 respectively with frame 11,21 connect, connecting rod 112,212 1 ends respectively with revolute pair 111,211 connect, connecting rod 112,212 other ends respectively with revolute pair 116,216 connect, connecting rod 15, an end of 25 respectively with revolute pair 116,216 connect, connecting rod 15,25 the other end respectively with ball pivot 19,29 connect, moving sets 32 is connected with frame 31 in the branch, one end of connecting rod 33 is connected with moving sets 32, the other end of connecting rod 33 is connected with revolute pair 34, and the axis normal of the axis of revolute pair 34 and moving sets 32, one end of connecting rod 35 is connected with revolute pair 34, the other end of connecting rod 35 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38, moving platform 4 respectively with ball pivot 19,29 are connected with first rotating shaft 38a of universal hinge 38; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 34, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The centre of sphere of ball pivot 19, the central point of the centre of sphere of ball pivot 29 and universal hinge 38 (intersection point of rotating shaft 38a and 38b) is on same straight line.
Embodiment 7:
As shown in Figure 7, moving platform 4 is by three branches and frame 11,21 are connected with 31, revolute pair 111,211,311 respectively with frame 11,21 are connected with 31, connecting rod 112,212,312 1 ends respectively with revolute pair 111,211,311 connect, connecting rod 112,212,312 other ends respectively with moving sets 113,213,313 connect, connecting rod 114,214, an end of 314 respectively with moving sets 113,213,313 connect, connecting rod 114,214 the other end respectively with ball pivot 19,29 connect, the other end of connecting rod 314 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38, moving platform 4 respectively with ball pivot 19,29 are connected with first rotating shaft 38a of universal hinge 38; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The centre of sphere of ball pivot 19, the central point of the centre of sphere of ball pivot 29 and universal hinge 38 (intersection point of rotating shaft 38a and 38b) is on same straight line.
Embodiment 8:
As shown in Figure 8, moving platform 4 and frame 11,21,31 by three branches' connections, moving sets 12 in the branch, 22,32 be not parallel to each other and respectively with frame 11,21,31 connect, connecting rod 13,23, an end of 33 respectively with moving sets 12,22,32 connect, connecting rod 13,23,33 the other end respectively with revolute pair 14,24,34 connect, and revolute pair 14,24,34 axis respectively with moving sets 12,22,32 axis normal, connecting rod 15,25, an end of 35 respectively with revolute pair 14,24,34 connect, connecting rod 15,25 the other end respectively with second rotating shaft 110b of universal hinge 110, second rotating shaft 210b of universal hinge 210 connects, the other end of connecting rod 35 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38, moving platform 4 respectively with first rotating shaft 110a of universal hinge 110, first rotating shaft 210a of universal hinge 210 and first rotating shaft 38a of universal hinge 38 are connected; First rotating shaft 210a of first rotating shaft 110a of universal hinge 110 and universal hinge 210 overlaps, and the plane that is parallel to moving platform, second rotating shaft 110b of universal hinge 110 and second rotating shaft 210b of universal hinge 210 are parallel, and are parallel to the axis of revolute pair 14,24; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 110 (intersection point of rotating shaft 110a and 110b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 210 (intersection point of rotating shaft 210a and 210b) and universal hinge 38 is on same straight line.
Embodiment 9:
As shown in Figure 9, moving platform 4 is connected with 31 by three branches and frame 11,21, revolute pair 111,211,311 is connected with 31 with frame 11,21 respectively, connecting rod 112,212,312 1 ends are connected with revolute pair 111,211,311 respectively, and connecting rod 112,212,312 other ends are connected with moving sets 113,213,313 respectively; One end of connecting rod 114,214,314 is connected with moving sets 113,213,313 respectively, and the other end of connecting rod 114,214 is connected with second rotating shaft 110b of universal hinge 110, second rotating shaft 210b of universal hinge 210 respectively; The other end of connecting rod 314 is connected with revolute pair 36, and an end of connecting rod 37 is connected with revolute pair 36, and the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38; Moving platform 4 is connected with first rotating shaft 110a of universal hinge 110, first rotating shaft 210a of universal hinge 210 and first rotating shaft 38a of universal hinge 38 respectively; First rotating shaft 210a of first rotating shaft 110a of universal hinge 110 and universal hinge 210 overlaps, and the plane that is parallel to moving platform, second rotating shaft 110b of universal hinge 110 and second rotating shaft 210b of universal hinge 210 are parallel, and are parallel to the axis of revolute pair 111,211; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 110 (intersection point of rotating shaft 110a and 110b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 210 (intersection point of rotating shaft 210a and 210b) and universal hinge 38 is on same straight line.
Embodiment 10:
As shown in figure 10, moving platform 4 is by three branches and frame 11,21 are connected with 31, revolute pair 111,211,311 respectively with frame 11,21 are connected with 31, connecting rod 112,212,312 1 ends respectively with revolute pair 111,211,311 connect, connecting rod 112,212,312 other ends respectively with revolute pair 116,216,316 connect, connecting rod 15,25, an end of 35 respectively with revolute pair 116,216,316 connect, connecting rod 15,25 other ends respectively with second rotating shaft 110b of universal hinge 110, second rotating shaft 210b of universal hinge 210 connects, the other end of connecting rod 35 is connected with revolute pair 36, one end of connecting rod 37 is connected with revolute pair 36, and the other end of connecting rod 37 is connected with second rotating shaft 38b of universal hinge 38; Moving platform 4 is connected with first rotating shaft 110a of universal hinge 110, first rotating shaft 210a of universal hinge 210 and first rotating shaft 38a of universal hinge 38 respectively; First rotating shaft 210a of first rotating shaft 110a of universal hinge 110 and universal hinge 210 overlaps, and is parallel to moving platform, and second rotating shaft 110b of universal hinge 110 and second rotating shaft 210b of universal hinge 210 are parallel, and are parallel to the axis of revolute pair 111,211; First rotating shaft 38a of universal hinge 38 is parallel to the plane of moving platform, and perpendicular to the axis of revolute pair 36, second rotating shaft 38b of universal hinge 38 is perpendicular to the plane of moving platform; The central point of universal hinge 110 (intersection point of rotating shaft 110a and 110b), the central point (intersection point of rotating shaft 38a and 38b) of central point of universal hinge 210 (intersection point of rotating shaft 210a and 210b) and universal hinge 38 is on same straight line.
In the foregoing description, according to the kinematic pair principle of equal effects in the theory of mechanisms, revolute pair in first branch and second branch and the length of connecting rod between the universal hinge can be zero, and revolute pair and universal hinge can substitute with a ball pivot, and this ball pivot central point is universal hinge central point.Therefore, embodiment 1 and embodiment 2 are deformed into embodiment 4 and embodiment 7 respectively.
According to the passive kinematic pair discrimination principles of theory of mechanisms, first rotating shaft perpendicular to moving platform is passive rotating shaft in the universal hinge of first branch and second branch as can be known, does not rotate, and removes the whole free degree that this rotating shaft does not influence mechanism.After removing this rotating shaft, again according to the kinematic pair principle of equal effects in the theory of mechanisms, length of connecting rod between revolute pair in first branch and second branch and original universal hinge second rotating shaft can be zero, and second rotating shaft of revolute pair and original universal hinge can substitute with a new universal hinge.Therefore, embodiment 1, embodiment 2 and embodiment 3 are deformed into embodiment 8, embodiment 9 and embodiment 10 respectively; Also can oppositely be expressed as: embodiment 8, embodiment 9 and embodiment 10 form embodiment 1, embodiment 2 and embodiment 3 after increasing by a revolute pair respectively.
Claims (10)
1, has two parallel institutions that change a shift three degrees of freedom, comprise moving platform (4), frame (11,21,31) and be connected in first, second and the 3rd branch between moving platform and the frame in parallel; It is characterized in that described the 3rd branch is connected with the first single dof mobility pair, the second single dof mobility pair, revolute pair (36) and universal hinge (38) in turn from the frame to the moving platform, in described first branch, second branch, each branch is connected with the first single dof mobility pair in turn from the frame to the moving platform, second single dof mobility is secondary and universal hinge; The revolute pair axis (18a) of universal hinge (18) the connection moving platform in described first branch is parallel to each other with the revolute pair axis (28a) that the universal hinge (28) in second branch is connected moving platform; The line of universal hinge (18) central point in first branch and universal hinge (28) central point in second branch is through the central point of the universal hinge (38) in the 3rd branch, and universal hinge (38) connects revolute pair (38a) axis normal of moving platform or is parallel to revolute pair axis (18a), (28a) that two universal hinges (18) in first branch, second branch, (28) connect moving platform in the 3rd branch.
2, parallel institution with two commentaries on classics, one shift three degrees of freedom according to claim 1, it is characterized in that the first single dof mobility pair in first branch, the second single dof mobility pair is respectively moving sets (12) and revolute pair (14), the first single dof mobility pair in second branch, the second single dof mobility pair is respectively moving sets (22) and revolute pair (24), first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively moving sets (32) and revolute pair (34), and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis; Perhaps, the first single dof mobility pair in first branch, the second single dof mobility pair are respectively revolute pair (111) and moving sets (113), the first single dof mobility pair in second branch, the second single dof mobility pair are respectively revolute pair (211) and moving sets (213), first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively revolute pair (311) and moving sets (313), and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis.
3, the parallel institution with two commentaries on classics, one shift three degrees of freedom according to claim 1, it is characterized in that the first single dof mobility pair, the second single dof mobility pair in first branch are respectively revolute pair (111) and revolute pair (116), the axis of revolute pair (111) and revolute pair (116) is connected the axis normal of the revolute pair (110a) of moving platform with the universal hinge (110) in the same branch; The first single dof mobility pair in second branch, the second single dof mobility pair are respectively revolute pair (211) and revolute pair (216), and the axis of revolute pair (211) and revolute pair (216) is connected the axis normal of the revolute pair (210a) of moving platform with the universal hinge (210) in the same branch; The first single dof mobility pair in the 3rd branch, the second single dof mobility pair are respectively revolute pair (311) and revolute pair (316); And revolute pair axis and revolute pair axis in the described same branch are parallel to each other.
4, according to claim 2 or 3 described parallel institutions with two commentaries on classics, one shift three degrees of freedom, it is characterized in that also increasing a revolute pair (16) between described first branch second single dof mobility pair and the universal hinge (18), also increase a revolute pair (26) between second single dof mobility pair in second branch and the universal hinge (28), the axis of revolute pair (16) is connected moving platform with universal hinge (18) in first branch revolute pair axis (18a) is vertical, and the axis of revolute pair (26) is connected moving platform with universal hinge (28) in second branch revolute pair axis (28a) is vertical; Second rotating shaft (18b) in the universal hinge of first branch (18) is coaxial with second rotating shaft (28b) in the universal hinge of second branch (28).
5, according to claim 2 or 3 described parallel institutions with two commentaries on classics, one shift three degrees of freedom, it is characterized in that having at least in the single dof mobility pair in each branch one to be active moving sets or active rotation pair, initiatively the driving mechanism of moving sets is the screw mechanism of driven by motor, or linear electric motors, the driving mechanism of active rotation pair is the reductor of driven by motor.
6, the parallel institution with two commentaries on classics, one shift three degrees of freedom according to claim 4, it is characterized in that having at least in the single dof mobility pair in each branch one to be active moving sets or active rotation pair, initiatively the driving mechanism of moving sets is the screw mechanism of driven by motor, or linear electric motors, the driving mechanism of active rotation pair is the reductor of driven by motor.
7, have two parallel institutions that change a shift three degrees of freedom, first, second and the 3rd branch that comprise moving platform (4), frame (11,21,31) and connect moving platform and frame; It is characterized in that wherein from the frame to the moving platform, being connected with the first single dof mobility pair, the second single dof mobility pair and ball pivot (19) in turn in first branch, from the frame to the moving platform, be connected with the first single dof mobility pair, the second single dof mobility pair and ball pivot (29) in second branch in turn; The 3rd branch is connected with the first single dof mobility pair, the second single dof mobility pair, revolute pair (36) and universal hinge (38) in turn from the frame to the moving platform; Line between ball pivot (19) central point in described first branch and second branch and ball pivot (20) central point is through the central point of universal hinge (38) in the 3rd branch.
8, the parallel institution with two commentaries on classics, one shift three degrees of freedom according to claim 7 is characterized in that first single dof mobility pair and the second single dof mobility pair in the 3rd branch is respectively moving sets (32) and revolute pair (34); First single dof mobility pair and the second single dof mobility pair in described first branch are respectively moving sets (12) and revolute pair (14), first single dof mobility pair and the second single dof mobility pair in second branch are respectively moving sets (22) and revolute pair (24), and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis, perhaps
First single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair (111) and moving sets (113), first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair (211) and moving sets (213), and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis, perhaps
First single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair (111) and revolute pair (116), first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair (211) and revolute pair (216), and two revolute pair axis in the described same branch are parallel to each other.
9, parallel institution with two commentaries on classics, one shift three degrees of freedom according to claim 7, it is characterized in that first single dof mobility pair and the second single dof mobility pair in the 3rd branch are respectively revolute pair (311) and moving sets (313), first single dof mobility pair and the second single dof mobility pair in first branch are respectively revolute pair (111) and moving sets (113), first single dof mobility pair and the second single dof mobility pair in second branch are respectively revolute pair (211) and moving sets (213), and the moving sets axis in the described same branch is vertical mutually with the revolute pair axis.
10, according to claim 7 or 8 or 9 described parallel institutions with two commentaries on classics, one shift three degrees of freedom, it is characterized in that having at least in the single dof mobility pair in each branch one to be active moving sets or active rotation pair, initiatively the driving mechanism of moving sets is the screw mechanism of driven by motor, or linear electric motors, the driving mechanism of active rotation pair is the reductor of driven by motor.
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