Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
  • B25J15/00—Gripping heads and other end effectors
  • B25J15/02—Gripping heads and other end effectors servo-actuated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
  • B25J19/00—Accessories fitted to manipulators, e.g. for monitoring, for viewing; Safety devices combined with or specially adapted for use in connection with manipulators
  • B25J19/06—Safety devices

Definitions

• the invention relates to a gripping device, in particular as
• Effector is provided for an industrial robot, and which is equipped with a mechanical backup, and a robot system comprising such a gripping device.
• Industrial robots are programmable machines which are designed for the automatic handling or processing of objects or workpieces.
• a typical representative are so-called
• Articulated robots having a plurality of links connected by joints.
• such an industrial robot on a frame on which a rotatable so-called carousel is set up.
• a first arm of the robot which is also referred to as a rocker.
• another arm is arranged on another pivot, which is provided at its free end with a receptacle for a tool.
• the tool is also called an effector.
• different tools can be provided, so that the industrial robots can have a variety of applications, such as the handling and transport of objects and workpieces, the machining of workpieces, measurement tasks, etc.
• For handling objects or workpieces a variety of gripping tools for robots previously known.
• a robot gripper is previously known, which is provided as an effector of a robot arm or can be attached to end portions of linear or rotary drives.
• the previously known gripper comprises at least one frame and an actuator element disposed thereon, the at least two
• the actuator element is formed bellows-like and can be filled with a medium, whereby it expands and acts on a suitable force transmission element on the jaws in order to move them relative to each other to access objects can.
• the gripper itself has no security devices that could prevent, for example, that a person working with the corresponding robot is injured, in particular crushed, by the gripper.
• In the open state of the jaws of the prior art gripper it is namely possible that inadvertent objects or body parts of a person are introduced into the space between the two jaws. If the actuator is actuated at this time, the jaws may be seriously injured as they move
• gripping device which can be used in particular as an effector for an industrial robot, and which is designed safer and in particular prevents the injury of persons by the gripping operation as safe as possible.
• This object is achieved with a gripping device according to claim l. It is also an object of the invention to provide a robot system that with a
• Gripping device is provided and a particularly safe operation allowed. This object is achieved with a robot system according to claim 13. 3. Detailed description of the invention
• the gripping device which can be used in particular as a tool or effector for a robot, has at least two clamping jaws, which are arranged so as to be movable relative to one another in order to grip a workpiece.
• an actuator or drive means may be provided, such as in particular electrically, hydraulically or pneumatically operated drive means.
• Securing element which is movably mounted on the jaw and is movable between a securing position and a release position.
• the securing element is designed so that it occupies at least partially in the securing position, the space between the two jaws to prevent inadvertent insertion of objects or body parts in the occupied space.
• the fuse element works without it requires an external power supply, for example by adjusting means.
• the securing element is biased by a spring element in the securing position. In this way, the gripping device is designed for safe side and the fuse element without an error-prone control device always in the correct position for the protection of people.
• the securing device according to the invention is particularly advantageous when clamping jaws are used which have two or more associated pairs of functional surfaces.
• Jaws allow the functionally correct gripping of two differently shaped workpieces.
• the first pair of functional surfaces may be formed to be round
• Functional surfaces is designed to grip an object with a cuboid structure. In such gripping devices naturally only one of the pairs of functional surfaces is used in the application, for example, the pair with the contour for receiving a round component. Because both pairs of
• the present invention thus allows safe operation of such jaws with at least two associated pairs of
• the securing element is configured such that it can be moved by the insertion of a workpiece to be gripped in a predetermined direction between the two jaws from the securing position. If, however, a workpiece or a body part is guided from a direction other than the predetermined direction between the two jaws, blocked
• the securing element is arranged, for example, on the jaw pivotally about a pivot axis and the pivot axis is perpendicular to the relative direction of movement of the jaws.
• a movement of the securing element from the securing position into the release position is possible in such a case only when the securing element is rotated about this predetermined pivot axis.
• the securing element is set up such that it can only be moved out of the securing position if a force perpendicular to the pivot axis and perpendicular to the relative
• Movement direction is not strictly mathematical to understand, but also deviations from the vertical direction are allowed, as long as a sufficiently large force component is used vertically.
• the gripping device according to the invention has exactly two clamping jaws and preferably each of the two clamping jaws has a corresponding securing element.
• the two jaws are thus preferably designed symmetrically to each other, at least in connection with the securing element.
• the jaws are provided with cutting or pressing tools, so that the jaws not only grip a workpiece, but can also cut or press.
• gripping operations in the broadest sense also mean cutting or pressing operations, since a cutting or pressing process also always involves gripping the machined workpiece.
• the present invention further relates to a robot system comprising at least one robot arm provided with a gripping device as described above or as will be described below in connection with the figures.
• the robot or the robot system preferably comprises at least one Actuator to actuate the gripping device, in particular an electrically, hydraulically or pneumatically operated actuator.
• Fig. 1 is a gripping device according to the invention in one
• FIG. 2 shows the gripping device of FIG. 1 in a side view
• Fig. 3 is a sectional view of the gripper shown in Fig. 2;
• Fig. 4 is an exploded view of the gripper of Fig. 1;
• FIG. 5 shows the gripping device of FIG. 1 in a three-dimensional
• FIG. 1 shows a gripping device 1 according to the invention in a schematic, three-dimensional view.
• the gripping device 1 comprises two clamping jaws 10 and 20, which are arranged movable relative to one another in order to grip a workpiece.
• the two clamping jaws 10 and 20 are arranged movable relative to one another in order to grip a workpiece.
• Jaws have a substantially symmetrical structure and both have a corresponding securing element 30 and 40, respectively.
• the securing elements are rotatably mounted on the jaws via bolts 13 and 23.
• the pivot axis corresponds to the longitudinal orientation of the bolts 13 and 23 and is thus perpendicular to the relative
• the illustrated gripping device 1 has two associated pairs of functional surfaces to allow the functional gripping of two differently shaped workpieces.
• the first pair of functional surfaces is defined by the concave contours of the
• the functional surfaces 14 and 24 formed.
• the functional surfaces 14 and 24 form an associated pair, which is designed in particular for gripping workpieces with a round outer contour, such as pipes or hoses.
• the second pair is from the
• Functional surfaces 15 and 25 formed.
• the two functional surfaces 15 and 25 are flat and parallel to each other and designed to grip an object or body, the plane and parallel
• Exterior walls has or has.
• a free space 2 which is partially occupied by the two securing elements 30, 40, so that unintentional introduction of objects or body parts into the occupied space Space is prevented.
• the securing elements 30, 40 are shown in their securing position. Without the two securing elements, it would be possible, for example, when gripping an object with the second pair of functional surfaces 15, 25, another object or a body part into the space between the first pair of
• Functional surfaces 14, 24 passes and there damaged by the closer together functional surfaces 14, 24 or injured.
• Embodiments with two pairs of functional surfaces limited, but can also develop their beneficial effects, for example, if the second pair of functional surfaces 15, 25 is not provided and the jaws 10, 20 so to speak at the height of the bolts 13 and 23 end. Furthermore, it can be seen in FIG. 2 that the
• Fuse elements 30, 40 do not contact. This is based on this, since this a simpler movement of
• Release position preferably by the workpiece to be gripped / pressed, is / is possible. However, one is as well
• Embodiment conceivable in which the securing elements 30, 40 at least partially touch, so that (in the securing position), a gap between the securing elements 30, 40 can be kept as low as possible or avoided.
• the two securing elements 30, 40 are shown in their securing position, in which they partially occupy the space between the two clamping jaws, namely to the extent that unintentional introduction of objects or body parts into the occupied space is prevented.
• the fuse elements fill the occupied space in all three
• Securing elements consist only of, for example, thin lock washers, of which could then be provided on each jaw two, inadvertent insertion of objects from the front or rear into the free space 2 (front here refers to the arrangement, as shown in Figure 1 1, with the side to be visible in FIG. 1 being "front.”
• front here refers to the arrangement, as shown in Figure 1 1, with the side to be visible in FIG. 1 being "front.”
• the spatial configuration of the securing element depends on the size and design of the clamping jaws and can be performed by a person skilled in the art
• the fuse elements 30 and 40 are at their respective
• the jaw 20 has a correspondingly shaped cavity 28 for receiving the
• the fuse element is in the
• the securing element 30 is rotated counterclockwise around the axis of rotation of the bolt 23 into a corresponding cavity 18 in the clamping jaw 10.
• the corresponding force component perpendicular to the axis of rotation - as the skilled artisan recognizes - can be advantageously generated in that a workpiece to be gripped is inserted in a predetermined direction between the two jaws. If the gripping device 1, for example, to grab a pipe, this must be substantially parallel to the axis of rotation of the
• the pivot or rotation axis of the securing elements is perpendicular to the relative direction of movement of the jaws. In order to move the securing elements into the release position, it is therefore necessary in the preferred embodiment shown that the workpiece is introduced perpendicular to the pivot axis as well as perpendicular to the relative direction of movement of the clamping jaws. For example, if an article or a body part is "from above" in the illustration of FIGS.
• Swivel axis and perpendicular to the relative direction of movement in the strict mathematical sense is introduced, but that it is sufficient if the workpiece is inserted so close to the mathematical perpendicular that a sufficiently large vertical force component acts on the security elements.
• FIG. 4 shows a schematic exploded view of the gripping device 1.
• the jaws 10, 20 are due to the design of several elements that can be screwed together by means of screws 19. From the exploded view also shows how the gripping device 1 is mounted.
• FIG. 5 is a three-dimensional, partially sectioned view showing the gripping device 1 attached to an actuator 60, which in turn is mounted on the end of a robot arm 70.
• Robot arm 70 is only indicated by the dashed lines and may for example be part of a joint robot.
• the actuator 60 has a housing 61 in which a motor 62 is located to the
• a motor control box of the engine 62 is designated.

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• Engineering & Computer Science (AREA)
• Robotics (AREA)
• Mechanical Engineering (AREA)
• Manipulator (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2014
  • 2014-06-02 DE DE102014210330.4A patent/DE102014210330B4/de not_active Expired - Fee Related
• 2015
  • 2015-06-01 WO PCT/EP2015/062126 patent/WO2015185493A1/de active Application Filing
  • 2015-06-01 EP EP15726946.5A patent/EP3148755A1/de not_active Withdrawn
  • 2015-06-01 CN CN201580029337.8A patent/CN106414000B/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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