System comprising a screw device, a nut, and a screw part having a threaded region

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.

Description

[0001] System with screw device, nut and a screw part with a threaded area

[0002] Description:

[0003] The invention relates to a system with a screw device, a nut and a screw part having a threaded area.

[0004] It is generally known that a nut can be screwed onto a threaded area using a tool.

[0005] From DD 1 44222 A1 a device for providing and positioning screw elements is known.

[0006] A device for automatically screwing on nuts is known from DD 2 24260 A1.

[0007] The invention is therefore based on the object of further developing an automated unscrewing process that can be carried out safely.

[0008] According to the invention, the object is achieved in the system according to the features specified in claim 1.

[0009] Important features of the invention in the system with screw device, nut and a screw part having a threaded area, in particular a threaded pin or bolt, are that the screw device has a housing part in which a driven toothed part is rotatably mounted, wherein the driven toothed part has an internal polygonal recess, in particular a hexagonal socket-shaped recess, in which the nut is received, wherein in particular two sides, in particular side surfaces, of the internal 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 driven toothed part in a form-fitting manner in the circumferential direction relative 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 driven toothed part.

[0010] The advantage here is that the nut is magnetically held and thus securely held in the drive gear of the screwing device, regardless of the screwing device's spatial orientation. A slider can also be used optionally for additional security.

[0011] Preferably, the permanent magnets are recessed into the recesses of the side surfaces of the inner polygonal recess, thus safely spaced from the nut. The porous material of the permanent magnets is thus not subjected to any significant mechanical stress. The nut therefore only touches the side surfaces of the inner polygonal recess in the area outside the recesses.

[0012] In an advantageous embodiment, the inner polygonal recess has a hexagon socket 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.

[0013] In an advantageous embodiment, the nut is made of a ferromagnetic material, particularly steel. The advantage here is that the nut is magnetically durable.

[0014] In an advantageous embodiment, the nut has a collar region that projects radially toward the external hexagon area, in particular for axially limiting the nut, in particular wherein the collar region adjoins the external hexagon area, in particular wherein the axial direction is related to the axis of rotation of the output gear part. It is advantageous that the nut is axially limited when received in the output gear part, in particular the gear.

[0015] In an advantageous embodiment, the output gearing part can be driven by an input gearing part via further meshing gears. The gears and the input gearing part are rotatably mounted in the screwing device, and the input gearing part can be driven by an electric motor of the screwing device. This allows for the use of a cost-effective drive type and allows for high torque to be transmitted from the input to the output gearing part.

[0016] In an advantageous embodiment, the output gearing part is driven by a toothed belt, which is driven by a drive gearing part rotatably mounted in the screw device. This is advantageous in that a simple, cost-effective drive of the output gearing part can be achieved by the drive gearing part.

[0017] In an advantageous embodiment, the system comprises a robot arm that holds the screwing device. This is advantageous because the screwing device can be used in different spatial orientations.

[0018] In an advantageous embodiment, the internal polygonal recess extends continuously through the driven gearing part and / or through the screw device. This is advantageous because no air cushion prevents the nut from being inserted.

[0019] In an advantageous embodiment, the inner polygonal recess is enclosed by a recess extending through the screw device. This is advantageous because no air cushion prevents the nut from being inserted.

[0020] In an advantageous embodiment, the permanent magnets are cylindrical, and the recesses in which the permanent magnets are accommodated and glued are correspondingly cylindrical, in particular internally cylindrical. This is advantageous because it enables simple manufacturing.

[0021] In an advantageous embodiment, the side surfaces of the inner polygonal recess, where no indentations are eroded, are in contact with the outer surfaces of the nut, in particular in contact. This is advantageous because a large torque can be transmitted from the driven gear part to the nut.

[0022] In an advantageous embodiment, the screw device has a movably arranged slide which has a locking tab, wherein the locking tab is arranged below the nut in a first position of the slide in the direction of gravity, in particular such that the nut is delimited by the locking tab in the direction of gravity, and the locking tab does not delimit the nut in a second position of the slide, in particular so that the vertical projection of the nut in the direction of gravity into 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 slide in this plane. It is advantageous in this case that the nut received in the screw device can be secured against falling out by means of the locking tab.Only at the beginning of the screw connection between the nut and the threaded area is the locking tab retracted and thus the nut is released for screw connection to the threaded area.

[0023] By accommodating the nut in a gear part, the externally toothed gear part can be driven by another gear, which in turn is driven by a gear that is driven directly or via other gears by a driving gear part.

[0024] In an advantageous embodiment, the inner polygonal recess is a hexagon socket, and the nut has an outer hexagon area. This provides a positive fit in the circumferential direction, allowing the nut to be set in rotation by the screwing device.

[0025] In an advantageous embodiment, the nut has a collar region that projects radially toward the external hexagon region, in particular for axially limiting the nut, in particular wherein the collar region borders the external hexagon region, in particular wherein the axial direction is related to the rotational axis of the output gear part. It is advantageous that the nut can only be inserted up to the stop of the collar region on the end face of the output gear part or up to the stop of the collar region on the housing part.

[0026] In an advantageous embodiment, the slider can be driven by a linear actuator, in particular a pneumatic drive, of the screwing device, in particular in a linear and / or reciprocating manner, in particular wherein the linear actuator, in particular a pneumatic drive, is attached to and / or supported on the housing part. It is advantageous that the screwing device, including the linear actuator, can be designed compactly.

[0027] In an advantageous embodiment, the output gearing part can be driven by an input gearing part via further meshing gears, wherein the input gearing part can be driven by an electric motor of the screwing device. Advantageously, this drive can be carried out with a high torque.

[0028] In an advantageous embodiment, the output gearing part is driven by a toothed belt, which is driven by a drive gearing part rotatably mounted in the screw device. The advantage here is that the drive can be implemented simply and cost-effectively.

[0029] In an advantageous embodiment, the system comprises a robotic arm that holds the screwing device. This allows the nut to be screwed on in different orientations and positions.

[0030] In one advantageous embodiment, the inner polygonal recess extends continuously through the driven toothed part and / or through the screw device. In another advantageous embodiment, the inner polygonal recess is enclosed by a recess extending continuously through the screw device. This is advantageous because no air cushion is created when inserting the nut into the recess, which would make insertion more difficult.

[0031] In an advantageous embodiment, the slider is arranged for linear movement, with a linear guide formed or attached to the housing part, which guides the slider linearly. It is advantageous that the slider can be guided on the housing part.

[0032] In an advantageous embodiment, a slide bracket is connected to the housing part. The slide is connected to a slide block by means of slide side parts, on which the linear actuator, in particular a plunger of the linear actuator, is supported. In particular, the slide block has a cylindrical projection that is guided in an elongated hole in the slide bracket. Advantageously, the slide bracket is easy to construct and, together with the housing part, functions as a guide. Furthermore, a stable slide block is provided, into which forces can be introduced from the linear actuator, in particular the pneumatic drive.

[0033] In an advantageous embodiment, the slide bracket has a non-circular recess into which a correspondingly shaped elevation of the housing part protrudes, particularly to achieve a play-free and precise connection between the slide bracket and the slide device. This is advantageous because a rigid connection between the housing part and the slide bracket can be achieved.

[0034] In an advantageous embodiment, the slide is arranged so as to be rotatable relative to the housing part, with a pivot joint for the slide being formed or attached to the housing part. This has the advantage that the system's installation space is larger in the lateral direction but smaller in the direction of the connecting line between the input and output gear parts. In an advantageous embodiment, 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. This has the advantage of achieving a stable structure.

[0035] In an advantageous embodiment, the slider has the locking tab and two lateral guide tabs of the slider, which rest against the housing part and limit the linear movement of the slider in the transverse direction, in particular, and thus guide it, in particular, with the guide tabs on the locking tab being bent at a vertical bending angle. It is advantageous that the slider can be designed as a stamped and bent part from a single piece of sheet metal, in particular in one piece, and supports the locking function as well as the guiding function.

[0036] In an advantageous embodiment, the slider bracket is designed as a flat stamped sheet metal part. This is advantageous in that it is simple and cost-effective to manufacture.

[0037] In an advantageous embodiment, the linear actuator is attached to the slider bracket. This is advantageous because, while the slider device requires a long installation space, its lateral expansion is limited.

[0038] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0039] The invention will now be explained in more detail using schematic illustrations:

[0040] Figure 1 shows a first screwing device according to the invention in an oblique view.

[0041] Figure 2 shows a sectional view of the screwing device.

[0042] Figure 3 shows a side view of the screwing device.

[0043] Figure 4 shows a top view of the screwing device.

[0044] Figure 5 shows an oblique view of the exploded screw device.

[0045] Figure 6 shows a second screwing device in an oblique view.

[0046] Figure 7 shows an oblique view of a driven toothed part 70 of a third screw device.

[0047] Figure 8 shows a plan view corresponding to Figure 7.

[0048] Figure 9 shows a sectional view corresponding to Figure 7.

[0049] Figure 10 shows an oblique view of a driven toothed part 70 of a fourth screw device.

[0050] In Figure 11, the nut, which can be inserted into the driven toothed part 70, is shown in an oblique view.

[0051] In Figure 12, an output gear part 70 of a fifth screw device is shown in an oblique view, wherein a spring ring 120 is inserted into the output gear part 70.

[0052] Figure 13 shows a plan view corresponding to Figure 12. Figure 14 shows a sectional view corresponding to Figure 12.

[0053] Figure 15 shows an exploded oblique view corresponding to Figure 12.

[0054] As shown in Figures 1 and 2, the screwing device has a housing part 1 on which a pneumatic drive 6 is arranged, which drives a slide 3, which has a locking tab 7, via a plunger 5, so that this slide 3 can be moved linearly, in particular back and forth.

[0055] In the housing part 1, a particularly continuous recess is formed, in which a nut 2 can be received, wherein the nut 2 is positively connected to a driving gear of the screwing device.

[0056] In a first linear position of the slider 3, the locking tab 7 secures the nut 2 in a form-fitting manner, in particular against falling out of the recess of the housing part 1. In particular, the locking tab 7 is arranged below the recess

[0057] In a second linear position of the slider 3, the locking tab 7 is retracted from the recess, and thus the nut 2 is not secured against falling out. Therefore, the nut 2 begins to move downward and can thus be screwed onto a threaded portion of a screw component located below the recess, such as a threaded pin or screw, by driving the driven gearing part.

[0058] For this purpose, gears are rotatably mounted within the housing part and are in engagement with one another, wherein a first of the gears is in engagement with the driving gear part 8, in particular gear, and a last of the gears is in engagement with the driving gear part, in which the nut 2 is received in a form-fitting manner in the circumferential direction.

[0059] By means of a driving electric motor, which is not shown in the figures, the input gearing 8 can be set in rotational motion, and thus also the output gearing 8. The nut 2, which is placed on the threaded area and driven by the output gearing 8, is thus set in rotational motion by the output gearing 8 and is thereby screwed onto the threaded area.

[0060] The screwing device is held and moved by a robotic arm, allowing screw connections to be operated fully automatically.

[0061] The slide 3 can be arranged on the side of the housing part 1 facing away from the pneumatic drive.

[0062] The area covered by the slide 3 in the direction of the linear axis overlaps with the area covered by the pneumatic drive in the direction of the linear axis.

[0063] In the embodiment shown in Figures 3 to 5, in contrast to the embodiment according to Figures 1 and 2, the pneumatic drive is spaced from the locking tab 7 in the direction of the linear axis.

[0064] The slide 3 is connected to the slide bracket 31 by means of two side parts 32, which connect the slide 3 to a slide block 30, wherein the slide is movable in the direction of the linear axis.

[0065] The sliding bracket 31 is attached to the housing part 1, in particular from below, i.e. on the side of the housing part 1 facing away from the driving gear part.

[0066] The slider has the two side parts 32, the slider block 30 and the locking tab 7, in particular the slider blade, in particular wherein these parts are screwed and pinned together.

[0067] The slide bracket 31 has a non-circular through-hole into which a correspondingly shaped projection of the housing part 1 projects, so that the housing part 1 is positively connected to the slide bracket at least in the direction of the linear axis. A pin projecting from the slide block projects into an elongated hole of the slide bracket 31, so that the slide is guided by the slide bracket 31 in the direction of the linear axis, i.e., the sliding direction.

[0068] The slide bracket 31 has a narrow area in which the non-circular hole is located and a wide area on which a linear actuator, such as a pneumatic drive or the like, is mounted. The linear actuator is connected to the movably arranged slide block 30 and supported on the slide bracket 31. Thus, the slide is arranged for reciprocating movement.

[0069] The elongated hole overlaps with both the narrow and the wide areas of the slide bracket 31.

[0070] When the slider is moved forward, i.e. in the direction from the wide side to the narrow side, the nut 2 is secured and is only released by moving the slider backwards before it is screwed onto the threaded area.

[0071] As shown in Figure 6, in a second embodiment, the slider 60 is rotatably mounted on the housing part 1 via a pivot joint 62. The locking tab 61 of the slider 60 is thus arranged to be movable by a rotary movement to secure the nut 2.

[0072] The drive for the rotary movement of the slide 60 can be realized by an electric motor, which is mounted either directly on the housing part 1 or behind the housing part 1, wherein the slide 60 is moved via rods or via a belt.

[0073] However, increased lateral space is required.

[0074] In the embodiment shown in Figures 7 to 11, the nut is held magnetically by permanent magnets 90 being glued into recesses of the driven toothed part.

[0075] For this purpose, the driven gear part 70 has an internal polygonal recess, in particular a hexagon socket. Radially extending recesses are eroded into two sides of the internal polygonal recess, into which the permanent magnets 90 are inserted and glued. The other sides of the internal polygonal recess are designed without eroded recesses and are therefore sufficiently load-bearing to dissipate the torque introduced when screwing the nut 2.

[0076] Preferably, the permanent magnets 90 are cylindrical and the recesses are correspondingly cylindrical.

[0077] Since the nut 2 is made of a ferromagnetic material, in particular steel, the nut 2 is magnetically held in the driven toothed part 70 and is thus secured against falling out, especially in any spatial rotational position of the screwing device. The robot-controlled trajectory of the screwing device can therefore be executed without any restriction of the spatial position.

[0078] In the embodiment shown in Figures 12 to 15, the nut 2 is held in a force-locking manner by a spring ring 120 being fastened to the driven toothed part 70.

[0079] For this purpose, continuous axial grooves 121 are machined into the output gear part 70 in two side surfaces of the inner polygonal recess of the output gear part.

[0080] The spring ring 120 has an annular base region from which radially outwardly extending, radially outwardly extending regions 151 protrude. Furthermore, spring clips 150 protrude axially from the base region, with the respective end region spaced from the base region being bent in the radial direction.

[0081] The spring clips 150 of the spring ring 120 engage in the axial grooves 121 during the insertion of the spring ring 120 into the driven toothed part 70 and are elastically tensioned so that at the end of the insertion process the end regions engage behind the driven toothed part 70, in particular and rest against the end face of the driven toothed part 70.

[0082] Preferably, the spring clips 150 have a bend directed in the radial direction.

[0083] When inserting the nut 2 into the recess of the driven gear part 70, the radial outer sides, particularly the sides of the external hexagon surface area of ​​the nut 2, rest against the spring clips 150, which are further elastically deformed. The spring clips 150 are elastically deformed by the nut 2 in the radial direction.

[0084] In this way, the nut 2 is held in a force-locking manner in the driven toothed part 70 by elastic deformation of the spring clips 150.

[0085] When the driven toothed part 70 rotates, a sufficient amount of torque is transmitted through those side surfaces of the inner polygonal recess of the driven toothed part 70 which do not have axial grooves 121.

[0086] The radial regions 151 are located in correspondingly shaped recesses in the front side of the driven toothed part 70. This enables precise positioning and alignment of the spring ring 120.

[0087] The spring ring 120 is made as a stamped and bent part from a metal sheet.

[0088] In further embodiments of the invention, an electromagnet is used instead of the permanent magnet.

[0089] In further embodiments according to the invention, the nut is held magnetically by means of the permanent magnets 90 according to Figures 7 to 11. However, to increase safety, a linearly movable or rotationally movable slider according to Figures 1 to 6 is still present.

[0090] In further embodiments according to the invention, the nut 2 is held in a force-locking manner by means of the spring ring 120 as shown in Figures 12 to 15. However, to increase safety, a linearly movable or rotationally movable slider as shown in Figures 1 to 6 is nevertheless provided.

[0091] 1 housing part

[0092] 2 mother

[0093] 3 sliders

[0094] 4 locking part

[0095] 5 pestles

[0096] 6 pneumatic drive

[0097] 7 locking tab

[0098] 8 driving gear part

[0099] 30 slide block

[0100] 31 Slider console

[0101] 32 Slider side part

[0102] 60 sliders

[0103] 61 locking tab

[0104] 62 swivel joint

[0105] 70 driven gear part

[0106] 90 permanent magnet

[0107] 100 edges

[0108] 120 spring ring

[0109] 121 axial groove

[0110] 150 spring clips

[0111] 151 radial areas

Claims

Patent claims:

1. System, in particular a screw system, with a 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 rotatably mounted, characterized in that the driven toothed part has an internal polygonal recess, in particular a hexagonal socket-shaped recess, in which the nut is received, wherein in particular two sides, in particular side surfaces, of the internal polygonal recess of the driven toothed part, depressions, in particular radially, in particular radially outwardly extending and / or directed depressions 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 driven toothed part in a form-fitting manner in the circumferential direction relative 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 driven toothed part.

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. Screwing 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. Screwing device according to one of the preceding claims, characterized in that the output toothed part can be driven by a driving toothed part via further, mutually meshing toothed wheels, wherein the toothed wheels and the driving toothed part are arranged rotatably mounted in the screwing device, wherein the driving toothed part can be driven by an electric motor of the screwing device, or that the output toothed part can be driven by a toothed belt which can be driven by a driving toothed part rotatably mounted in the screwing device.

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. Screwing 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 screwing device or that the inner polygonal recess is encompassed by a recess extending through the screwing device.

7. Screwing 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. 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, bear against the outer surfaces of the nut, in particular they bear against it in a touching manner.

9. Screwing device according to one of the preceding claims, characterized in that the screwing device has a movably arranged slide which has a locking tab, wherein the locking tab is arranged in a first position of the slide 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 in a second position of the slide the locking tab does not delimit the nut, in particular thus the vertical projection of the nut in the direction of gravity into 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 into this plane.

10. Screwing device according to one of the preceding claims, characterized in that the slider 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. 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. Screwing 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 of the slide bracket.

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 rotatably relative to the housing part, wherein a rotary joint for the slide is formed or attached to the housing part.

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. Screw device according to one of the preceding claims, characterized in that the slide has the locking tab and two lateral guide tabs which rest on the housing part and limit the slide in the transverse direction to the linear movement in particular and thus guide, in particular wherein the guide tabs on the locking tab are bent with a vertical bending angle, and / or that the slide bracket is designed as a flat stamped sheet metal part, and / or that the linear actuator is fastened to the slide bracket.

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