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EP-4739460-A1 - SYSTEM COMPRISING A SCREW DEVICE, A NUT, AND A SCREW PART HAVING A THREADED REGION

EP4739460A1EP 4739460 A1EP4739460 A1EP 4739460A1EP-4739460-A1

Abstract

The invention relates to a system comprising a screw device, a nut, and a screw part having a threaded region, wherein the screw device has a housing part in which an output gearing part is rotatably mounted, wherein the output gearing part has an internal polygonal recess in which the nut is or can be accommodated, wherein the nut is interlockingly accommodated in the output gearing part in the peripheral direction relative to the rotational axis of the output gearing part, wherein a movably arranged slider has a locking tab, wherein, in a first position of the slider, the locking tab is positioned below the nut in the direction of gravity, and, in a second position of the slider, the locking tab does not restrict the nut.

Inventors

  • NAGEL, GERD

Assignees

  • SEW-EURODRIVE GmbH & Co. KG

Dates

Publication Date
20260513
Application Date
20240603

Claims (15)

  1. 1. System, in particular screw system, with screw device, nut and a screw part having a threaded area, in particular a threaded pin or bolt, wherein the screw device has a housing part in which a driven toothed part is arranged in a rotatable manner, characterized in that the driven toothed part has an inner polygonal recess, in particular a hexagon socket-shaped recess, in which the nut is received, wherein in particular two sides, in particular side surfaces, of the inner polygonal recess of the driven toothed part, recesses, in particular radially, in particular radially outwardly extending and/or directed recesses are eroded into the driven toothed part, into each of which a respective permanent magnet is inserted and glued, in particular so that the nut is magnetically held in the driven toothed part, in particular wherein the nut is received in the peripheral direction in the driven toothed part in a form-fitting manner with respect to the axis of rotation of the driven toothed part, in particular wherein the radial direction, the axial direction and/or the circumferential direction, is related to the axis of rotation of the output gear part.
  2. 2. Screwing device according to claim 1, characterized in that the inner polygonal recess is a hexagon socket and the nut has an outer hexagon area.
  3. 3. Screw device according to one of the preceding claims, characterized in that the nut is made of a ferromagnetic material, in particular steel, and/or that the nut has a collar region projecting radially towards the external hexagon region, in particular for axially limiting the nut, in particular wherein the collar region adjoins the external hexagon region, in particular wherein the axial direction is related to the axis of rotation of the driven toothed part.
  4. 4. Screwing device according to one of the preceding claims, characterized in that the output gear part can be driven by a driving gear part via further gear wheels which mesh with one another, wherein the gear wheels and the driving gear part are arranged rotatably mounted in the screwing device, wherein the driving gear part can be driven by an electric motor of the screwing device, or that the output gear part can be driven by a toothed belt which can be driven by a driving gear part rotatably mounted in the screwing device.
  5. 5. Screwing device according to one of the preceding claims, characterized in that the system has a robot arm by which the screwing device is held.
  6. 6. Screw device according to one of the preceding claims, characterized in that the inner polygonal recess is formed continuously through the driven toothed part and/or through the screw device or that the inner polygonal recess is enclosed by a recess that extends through the screw device.
  7. 7. Screw device according to one of the preceding claims, characterized in that the permanent magnets are cylindrical and the recesses in which the permanent magnets are received and glued are correspondingly cylindrical, in particular internally cylindrical.
  8. 8. Screwing device according to one of the preceding claims, characterized in that Side surfaces of the inner polygonal recess, on which no depressions are eroded, rest against the outer surfaces of the nut, in particular rest in a touching manner.
  9. 9. Screwing device according to one of the preceding claims, characterized in that the screwing device has a movably arranged slider which has a locking tab, wherein the locking tab is arranged in a first position of the slider in the direction of gravity below the nut, in particular so that the nut is delimited in the direction of gravity by the locking tab, and the locking tab does not delimit the nut in a second position of the slider, in particular so that the vertical projection of the nut in the direction of gravity in a plane whose normal direction is aligned parallel to the direction of gravity is spaced from the vertical projection of the locking tab and/or the slider in this plane.
  10. 10. Screwing device according to one of the preceding claims, characterized in that the slide can be driven by a linear actuator, in particular a pneumatic drive, of the screwing device, in particular can be moved linearly and/or back and forth, in particular wherein the linear actuator, in particular a pneumatic drive, is fastened to the housing part and/or is supported.
  11. 11. Screwing device according to one of the preceding claims, characterized in that the slider is arranged to be linearly movable, wherein a linear guide is formed or attached to the housing part, which guides the slider linearly.
  12. 12. Screw device according to one of the preceding claims, characterized in that a slide bracket is connected to the housing part, wherein the slide is connected by means of slide side parts to a slide block on which the linear actuator, in particular a plunger of the linear actuator, is supported, in particular wherein the slide block has a cylindrical projection which is guided in an elongated hole in the slide bracket.
  13. 13. Screw device according to one of the preceding claims, characterized in that the slide bracket has a non-circular recess into which a correspondingly shaped elevation projects, in particular to achieve a play-free and precisely fitting connection between the slide bracket and the slide device, and/or that the slide is arranged to be rotatable relative to the housing part, wherein a swivel joint for the slide is formed or attached to the housing part.
  14. 14. Screwing device according to one of the preceding claims, characterized in that the slide is screwed and/or pinned to the slide side parts and/or the slide block is screwed and/or pinned to the slide side parts.
  15. 15. Screw device according to one of the preceding claims, characterized in that the slider has the locking tab and two lateral guide tabs which rest on the housing part and limit the slider in the transverse direction to the linear movement and thus guide it, in particular wherein the guide tabs on the locking tab are bent at a vertical bending angle, and/or that the slider bracket is designed as a flat stamped sheet metal part, and/or that the linear actuator is attached to the slider bracket.

Description

System with screw device, nut and a screw part with a threaded area Description: The invention relates to a system with a screw device, a nut and a screw part having a threaded area. It is well known that a nut can be screwed onto a threaded area using a tool. From DD 1 44222 A1 a device for providing and positioning screw elements is known. A device for automatically screwing on nuts is known from DD 2 24260 A1. The invention is therefore based on the object of further developing an automated, safe unscrewing process. According to the invention, the object is achieved in the system according to the features specified in claim 1. Important features of the invention in the system with screw device, nut and a screw part having a threaded area, in particular threaded pin or bolt, are that the screw device has a housing part in which a driven toothed part is arranged in a rotatable manner, wherein the driven toothed part has an inner polygonal recess, in particular a hexagon socket-shaped recess, in which the nut is received, wherein in particular in two sides, in particular side surfaces, of the inner polygonal recess of the driven toothed part, recesses, in particular radially, in particular radially outwardly extending and/or directed recesses are formed in the driven gear part are eroded, into each of which a respective permanent magnet is inserted and glued, in particular so that the nut is magnetically held in the driven gear part, in particular wherein the nut is positively received in the driven gear part in the circumferential direction relative to the axis of rotation of the driven gear part, in particular wherein the radial direction, the axial direction and/or the circumferential direction is related to the axis of rotation of the driven gear part. The advantage here is that the nut is held magnetically and is therefore held securely in the driven gear part of the screw device for all spatial orientations of the screw device. A slider can also be used optionally for additional security. Preferably, the permanent magnets are recessed into the recesses of the side surfaces of the inner polygonal recess and are thus safely spaced from the nut. The porous material of the permanent magnets is therefore not exposed to any significant mechanical stress. The nut therefore only touches the side surfaces of the inner polygonal recess in the area outside the recesses. In an advantageous embodiment, the inner polygonal recess has an internal hexagon and the nut has an external hexagon area. The advantage here is that the nut can be received in a form-fitting manner in the circumferential direction. In an advantageous embodiment, the nut is made of a ferromagnetic material, in particular steel. The advantage here is that the nut is magnetically durable. In an advantageous embodiment, the nut has a collar region which projects radially towards the external hexagon region, in particular for axially limiting the nut, in particular wherein the collar region adjoins the external hexagon region, in particular, the axial direction is related to the axis of rotation of the driven gear part. The advantage here is that the nut is axially limited when being received in the driven gear part, in particular gear wheel In an advantageous embodiment, the output gear part can be driven by a drive gear part via further gears that mesh with one another, the gears and the drive gear part being arranged in a rotatable manner in the screw device, the drive gear part being driven by an electric motor of the screw device. The advantage here is that a cost-effective type of drive can be used and a high torque can be passed from the drive to the output gear part. In an advantageous embodiment, the output gear part can be driven by a toothed belt, which can be driven by a driving gear part that is rotatably mounted in the screw device. The advantage here is that a simple, cost-effective drive of the output gear part can be achieved by the driving gear part. In an advantageous embodiment, the system has a robot arm that holds the screwing device. The advantage here is that the screwing device can be used in different spatial orientations. In an advantageous embodiment, the inner polygonal recess is formed continuously through the driven toothed part and/or through the screw device. The advantage here is that no air cushion counteracts the insertion of the nut. In an advantageous embodiment, the inner polygonal recess is surrounded by a recess that runs through the screw device. The advantage here is that there is no air cushion that prevents the nut from being inserted. In an advantageous embodiment, the permanent magnets are cylindrical and the recesses in which the permanent magnets are accommodated and glued are designed accordingly cylindrical, especially internally cylindrical. The advantage here is that it is easy to manufacture. In an advantageous embodiment, side surfaces of the inner polygonal recess, on which no depressions ar