Source: https://patents.google.com/patent/ES2373086T3/en
Timestamp: 2019-12-15 20:29:16
Document Index: 249841920

Matched Legal Cases: ['art 56', 'art 57', 'art 58', 'art 54', 'art 58', 'art 62', 'art 58', 'art 56', 'art 57', 'art 58']

ES2373086T3 - Device for moving and positioning an object in space. - Google Patents
Device for moving and positioning an object in space. Download PDF
ES2373086T3
ES2373086T3 ES09734337T ES09734337T ES2373086T3 ES 2373086 T3 ES2373086 T3 ES 2373086T3 ES 09734337 T ES09734337 T ES 09734337T ES 09734337 T ES09734337 T ES 09734337T ES 2373086 T3 ES2373086 T3 ES 2373086T3
ES09734337T
2012-01-31 Publication of ES2373086T3 publication Critical patent/ES2373086T3/en
Device for moving and positioning an object in space, with at least three actuating arms (18) that can rotate around a transmission / motor shaft (s), each connected to a transmission / motor unit (16), the free end of each actuating arm (18) acting articulated by bars (36, 38) connecting with a support element (26) with at least one grip means (50) connectable through a hose being articulated (54, 54a, 54b) of vacuum to a vacuum source with an aspiration opening (52) to grip the object by aspiration, characterized in that the vacuum hose (54, 54a, 54b) is conducted from the element (26) supporting up to the drive / motor shaft (s) of one of the drive / engine units (16) and can be connected to the vacuum source through a hose joint (60) arranged essentially on the drive / engine shaft (s) and that can revolve around the drive shaft / engine (s).
Device to move and position an object in space
The invention relates to a device for moving and positioning an object in space, with at least three actuating arms that can rotate around a transmission / motor shaft, each connected to a transmission / motor unit, being connected articulated form the free end of each actuating arm through connecting bars with a support element with at least one gripping means connectable through a vacuum hose to a vacuum source with a suction opening to suction grip the object. In the case of the device for moving and positioning an object in space it is a device called in the scientific world as a robot with parallel kinematics, also known by the term "delta robot".
The hose lines from the gripping tool to the vacuum supply are carried out in the case of delta robots conventionally through the connecting rods and through a hose section approximately 1500 mm long, freely suspended. This hose without support requires stability on the one hand, to be suspended in a self-supporting way in space, and on the other hand flexibility, to guarantee the extreme movements of the robot. The hose is subjected to both torsional and flexural stresses and may begin to vibrate. When robot and hose move in opposite directions, it can cause a pull, which not only damages the accuracy of the robot, but also puts the hose under great effort. For this reason the hose is exposed to great wear and therefore must be replaced after a short time.
From EP 1 129 829 A1 a robot is already known to handle products in a three-dimensional space. The robot comprises a base, on which three arms are arranged so that they can rotate. Each arm is attached to a tree of a servomotor. The gripping mechanisms can be joined through a vacuum hose with a vacuum source.
The invention is based on the objective of proposing a hose conduit for a device of the type mentioned at the beginning, which with respect to the conduction of hose with hose without support known by the prior art has a lower tendency to wear.
The solution according to the invention of the objective is that the vacuum hose is driven from the support element to the transmission / engine shaft of one of the transmission / engine units and can be connected to the vacuum source through a joint of hose arranged essentially on the drive / motor shaft and which can rotate around the drive / engine shaft.
The twist of the hose is released by a coupling piece that can rotate. Since a delta robot on the drive shaft / motor of the actuation arms has only a pure rotation movement, this coupling piece is placed on the rotation axis of one of the actuation arm drives. The hose must therefore only be able to compensate for the angular movements between the actuator arm and the connecting rods as well as the support element, which still gives rise to only small moments of flexion in the hose. With this, the hose can be carried very close to the actuator arm and the connecting rods.
Since the actuation arm moves, the hose is installed more in the direction of the motor shaft. At the end of the actuating arm, the hose is provided with an angular piece, which forms the part that can rotate from a "hose joint". The axis of rotation is in this respect almost on the drive / motor axis of the actuation arm.
Preferably the vacuum hose is driven along the connecting rods and the actuating arms and is detachably fixed by means of fasteners.
The clamping element in the actuating arm is preferably mounted so as to dampen the vibrations and compensate the game.
So that the swivel hose joint can be quickly and without tool removal, it is preferably provided with a quick seal, in particular a threaded bulkhead joint or a bayonet seal.
The hose line according to the invention has, in comparison with the solution with hose without support existing so far, the following advantages:
quick disassembly of hoses for cleaning
hoses undergo less stress by releasing torsion, hoses can be used
softer, increases the shelf life
greater safety through better controlled hose driving
greater precision thanks to lower disturbing forces on the robot
vibrations of the hoses are avoided
Advantages, features and further details of the invention are obtained from the following description of preferred embodiments as well as by means of the drawing; this one shows schematically in
Figure 1 an oblique view of a delta robot;
2 shows an oblique view of a delta robot equipped with elements for hose conduction according to the invention;
Figure 3 the principle of hose installation in the delta robot of Figure 2;
Figure 4-6 oblique views of the hose joint arrangement of Figure 2 in enlarged representation;
Figure 7 an oblique view of a hose clamp to a connecting arm of Figure 2 in enlarged representation;
A delta robot 10 shown in Figure 1 has a base element 12 with a horizontal mounting plane and three mounts 14 protruding from the base element 12 to each house a transmission / engine unit 16. On each transmission shaft defining a transmission / motor shaft s of each transmission / engine unit 16 sits an actuating arm 18 that can rotate around the transmission / motor shaft s. The three drive / motor axes s are located in a plane parallel to the assembly plane of the base element 12, and their cut-off points form the corners of an equilateral triangle. At the free end of each actuating arm 18, a first articulated rod 20 is defined which defines a first articulation axis m, located parallel to the transmission / motor axis s. Each first articulated rod 20 has at its two ends respectively a first articulated piece 22 of a first spherical joint 24. The first articulated pieces 22 arranged in pairs are arranged in a mirror-like manner with respect to a vertical plane, the three vertical planes being cut into a common vertical axis that forms an axis of symmetry for the arrangement of the three transmission units 18 / motor and forming an angle of 120 ° each other respectively.
A supporting element 26 essentially configured as a plate with lateral edges 28 forming an equilateral triangle, also called a toolholder or platform, is equipped in each of the three lateral edges 28 with a second articulated rod 30 defining a second axis of articulation n. Each second articulated rod 30 has at its two ends respectively a first articulated piece 32 of a second spherical joint 34. The first articulated pieces 32 arranged in pairs of each second articulated rod 30 are arranged in a symmetrical mirror with respect to a bisector of the equilateral triangle that characterizes the supporting element 26.
The distance between the first articulated pieces 22 at the free end of each actuating arm 18 is identical to the distance between the first articulated pieces 32 on the lateral edges 28 of the supporting element 26.
To each actuating arm 18 a lateral edge 28 of the supporting element 26 is associated. Each pair of identically configured connecting rods 36, 38, also called parallelogram bars, has at its ends a tip 39 with in each case an articulated second piece 40, 42. Each second piece 40, 42 articulated forms with a first piece 22, 32 articulated at the free end of the actuating arm 18 or at the side edge 28 of the supporting element 26 a corresponding first or second spherical joint 24, 34.
A short distance from the first and second spherical joints 24, 34, the two connecting bars 36, 38 are connected to each other through a prestressing element 48 which is essentially parallel to the articulation axes m, n.
The first pieces 22, 32 articulated at the free end of the actuating arm 18 or at the lateral edge 28 of the supporting element 26 are configured as articulation joints, the second pieces 40, 42 articulated at the tips 39 of the bars 36, 38 of union, like roofs.
The two connecting bars 36, 38 of equal length together with the two articulation bars 20, 30 also of equal length are a parallelogram link 44 with a respective spherical joint 24, 34 at each vertex of the parallelogram. The union of the actuating arms 18 with the supporting element 26 through a respective parallelogram link 44 prevents the rotation of the supporting element 26 around axes in the three spatial dimensions. The supporting element 26 can thus move only parallel to itself in reaction to a movement of the actuating arms 18. The controlled rotational movement of the actuating arms 18 around its transmission / motor axes s is therefore transformed into a linear movement of the supporting element 26.
The supporting element 26 is connected to the base element 12 through a central shaft 46 telescopically movable in its length to transmit turning moments. The central shaft 46 is fixed through a gimbal joint to the supporting element 26. At its opposite end to the supporting element 26, the central shaft 46 is connected to a drive shaft of a servomotor not shown in the drawing. Through the central tree 46 a rotation of the supporting element 26 can be generated in the three-dimensional space.
As is evident from FIG. 3, a gripping element 50 is mounted on the supporting element 26, which projects downwards with an aspiration opening 52 for suctioning an object. A vacuum hose 54, 54a, 54b that attaches the suction opening 52 with a vacuum source not shown in the drawing is detachably attached to the gripping element 50. Vacuum hose 54, 54a, 54b is conducted along an upward connecting rod 36 and detachably fixed to the connecting rod 36 in hose holders 66. These hose holders 66 may be additionally configured to accommodate pneumatic hoses 55.
In the case of a hose line according to the state of the art, the vacuum hose 54, 54a, 54b is connected to the upper end of the connecting bar 36 through a hose section approximately 50 cm long, suspended freely, with the vacuum source not shown in the drawing.
As shown in Figures 2-7, the vacuum hose 54, 54a, 54b in the case of a hose line according to the invention is driven from the upper end of the connecting bar 36 along the actuating arm 18 to the drive shaft / motor s and passes to an angular part 56. The free end of the angular piece 56 is located on the drive / motor shaft s and can be used as a rotating articulated part 57 of a hose joint 60 in a support and coupling piece 58 detachably attached to the base element 12 of the 10 robot through a quick close. This support and coupling part 58 stationary disposed is connected through an additional hose part 54b, which can be detachably connected with the support and coupling part 58 through a coupling part 62 with a vacuum source Not represented in the drawing.
The hose joint 60 therefore consists of the immovable support and coupling part 58, fastened with a quick closure to a mounting plate 59 fixed to a base element 12 of the robot 10, and in the mobile angular part 56 driving the acting arm 18.
The complete hose joint 60 can be disassembled according to Figure 2 in the direction of the arrow A. The hoses are disengaged and can therefore be cleaned or replaced. This applies to both vacuum hose 54 and pneumatic hoses 55.
The angular piece 56 is detachably anchored in a slider 64 positioned slightly movable in the actuating arm 18 through damping rubbers. This slider 64 transmits at once the necessary turning moment of the actuating arm 18 to the hose joint 60 and to the hoses 54, 54a but at the same time it can compensate for small axial tolerances in position and alignment between the axis of rotation of the joint of hose and the drive shaft / motor s of the actuating arm 18. Additionally, this slider 64 acts by damping the vibrations. The slider 66 can also be configured to accommodate pneumatic hoses 55.
The swivel articulated part 57 can be joined by means of the threaded bulkhead or bayonet closure connection 61 with the support and coupling part 58 and can be easily disassembled. For this, the hose 54, 54a is removed with the angular piece 56 of the quick-acting joints and the hose joint is twisted back, so that the threaded bulkhead connection 61 releases the joint.
Additionally, all hoses can be changed by means of fitting systems.
The construction is done as “Wipe” (sweep) and “Waschdown” (drag) construction. From the point of view of fluid mechanics the construction is developed so that no mechanical part is found in the air stream, so that optimum cleaning is guaranteed.
Along the vacuum hose 54, for example, pneumatic hoses 55 can be driven (for example, for valve handling). Since these pneumatic hoses have only small diameters and high flexibility, it is not necessary in this case to separate them by means of a turning joint. These hoses can be driven rather without disadvantage by means of a corresponding length of hose suspended freely, sufficiently long, in the actuating arm.
1. Device for moving and positioning an object in space, with at least three actuating arms (18) that can rotate around a transmission shaft / motor (s), each connected to a transmission unit (16) / motor, the free end of each actuating arm (18) being articulated connected by bars (36, 38) of 5 union with a support element (26) with at least one means (50) of grip connectable through from a vacuum hose (54, 54a, 54b) to a vacuum source with a suction opening (52) for suction gripping the object, characterized in that the vacuum hose (54, 54a, 54b) is conducted from the element (26) supporting up to the transmission / engine shaft (s) of one of the transmission / engine units (16) and can be connected to the vacuum source through a hose joint (60) disposed essentially on the shaft of transmission / engine (s) and
10 which can rotate around the drive shaft / motor (s).
2. Device according to claim 1, characterized in that the vacuum hose (54, 54a, 54b) is driven along the connecting rods (36, 38) and the actuating arms (18) and is detachably fixed by means of fastening elements (66, 64).
3. Device according to claim 2, characterized in that the clamping element (64) is mounted on the actuating arm 15 (18) so as to dampen the vibrations and compensate the game.
Device according to one of claims 1 to 3, characterized in that the swivel hose joint (60) is provided with a quick closure (61), in particular a threaded bulkhead connection or a bayonet closure.
ES09734337T 2008-04-22 2009-04-01 Device for moving and positioning an object in space. Active ES2373086T3 (en)
ES2373086T3 true ES2373086T3 (en) 2012-01-31
ES09734337T Active ES2373086T3 (en) 2008-04-22 2009-04-01 Device for moving and positioning an object in space.
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