DE102021200922A1 - Device for receiving and setting a screw, manipulation unit with such a device, and assembly system - Google Patents

Abstract

A device (16, 16') for receiving and setting a screw (8) with screw head (8a) and screw shank (8b) in a screw socket (7) of an external screw unit (6), with an outer sleeve (23) is proposed, among other things. , and with an inner sleeve (26) mounted in the same. The inner sleeve (26) is adjustably mounted in the outer sleeve (23) via a pair of threads with a corresponding outer thread (27) and inner thread (28). The inner sleeve (26) is axially supported at one end by means of at least one spring element (29) on a first sleeve end (24) of the outer sleeve (23) and at the other end has a receiving opening (31) for axially receiving a screw shank (8b) of a screw shank (8b ) in front of the screw (8) which is or can be inserted into the receiving opening (31) and which is or can be supported axially on the end face of the inner sleeve (26) by means of the screw head (8a). At least one clamping means (32) arranged on the inner sleeve (26) is assigned to the screw shank (8b) for frictionally locking the screw (8) in the inner sleeve (26).

Description

The invention relates to a device for receiving and setting a screw in an external screw unit according to the combination of features of claim 1 of the invention. According to claim 8 of the invention, the same also relates to a manipulation unit with at least one such device. According to claim 10 of the invention, this also relates to an assembly plant with, inter alia, such a manipulation unit.

For example, when mounting a chassis on the body of a vehicle, so-called modular assembly frames, referred to here as chassis carriers, are used. These are mechanical support structures that circulate in a system and hold and position all the necessary technical components that have to be installed under the vehicle until the so-called "marriage", in which the chassis and engine are screwed to the body. These include, without claiming completeness, for example said motor, an exhaust system, an axle and an axle damping. The purpose of these modular assembly frames or chassis carriers is to design the assembly processes in such a way that both the components to be assembled and the corresponding screws as fastening elements can be easily and inexpensively inserted from above before the screw sockets in the form of screw nuts may no longer or are very difficult to access. The usual vehicle separation of body and chassis helps with the efficient design of the assembly processes. About 50 of these modular assembly frames or chassis supports are used in a normal vehicle assembly line with about 1000 vehicles per day, which rotate in a cycle and are constantly being re-equipped

As already indicated above, one of the first operations is to insert the corresponding screws, which are then to be used to fasten the individual modules, into screw sockets of screw units. The screw head of each suitable screw must be inserted with the screw shank upwards into the relevant screw socket on the modular assembly frame or chassis carrier. So that the screws, which can be up to 120 cm long, do not get lost when transporting the assembly frame or chassis carrier, the screw sockets contain magnets that hold the screws at the head with the screw shank pointing upwards. This means that components that have to be screwed tight can be placed on these screws in subsequent stations. Once all the components have been positioned, the assembly frame or chassis support is moved under the appropriate body and automatic screwing units then gradually and according to a defined schedule tighten all screws with the appropriate torque.

1. 1. Der Montagewerker nimmt sich die für seinen Arbeitsvorgang notwendige Schraubenmenge in eine seiner Hände auf. Eine jede Schraube weist einen Schraubenkopf mit einem sogenannten Antrieb auf, überwiegend in Form eines Außensechskant;
2. 2. Der Montagewerker greift mit der anderen Hand beispielsweise eine Schraube schon positionsrichtig, insbesondere mit dem Schraubenkopf nach unten;
3. 3. Die besagte, eine Schraube aufweisende Hand wird über die betreffende Schraubnuss geführt;
4. 4. Der Schraubenkopf wird auf die Schraubnuss mit zum Schraubenkopf korrespondierenden Innensechskant gesetzt und dabei um eine vertikale Achse von beispielsweise 25° gedreht, damit der Schraubenkopf von der Schraubnuss formschlüssig aufgenommen und in dieselbe einrasten kann;
5. 5. Die Schraubnuss weist einen Magneten (Permanent- oder Elektromagnet) auf, welcher die Schraube in der Schraubnuss kraftschlüssig hält;
6. 6. In gleicher Weise werden nacheinander alle weiteren ursprünglich aufgenommenen Schrauben gesetzt.

Conventionally, said loading process with screws is carried out manually. A typical human hand sequence for loading the screw nuts is as follows:

1. 1. The assembly worker takes the number of screws required for his work process in one of his hands. Each screw has a screw head with a so-called drive, mainly in the form of an external hexagon;
2. 2. With the other hand, the assembly worker grasps a screw, for example, in the correct position, in particular with the screw head pointing downwards;
3. 3. Said hand holding a screw is passed over the nut in question;
4. 4. The screw head is placed on the screw socket with the hexagon socket corresponding to the screw head and is rotated about a vertical axis of, for example, 25° so that the screw head can be positively received by the screw socket and snap into place;
5. 5. The screw socket has a magnet (permanent or electromagnet) which holds the screw in the screw socket in a non-positive manner;
6. 6. In the same way, all the other originally picked up screws are set one after the other.

Depending on the size of the vehicle and the additional modules (e.g. all-wheel drive), the number of screws to be positioned on a chassis is around fifty screws per chassis carrier. The screw placement process is preferably carried out at several stations during chassis assembly.

There is a need to automate the loading of the screw sockets with screws or the setting of the screws in said screw sockets.

Measures for automating assembly processes per se have been known in a variety of designs for some time.

That's it DE 10 2008 018 848 A1 a robot-supported screwing device for the simultaneous screwing of several wheel bolts a wheel assembly on a vehicle is known. For this purpose, the wheel bolts are arranged in advance on the vehicle wheel or in the screwing tool and are held in the latter by means of suction and/or magnet systems. This should be done automatically. However, this publication is silent on the concrete means for the automated arrangement of the screws on the vehicle wheel or in the screwing tool. Alternatively, the robot-assisted screwing device should also be able to be used to assemble a body component, in particular an external add-on part, on the body of a vehicle.

From the DE 10 2009 053 130 A1 a device for guiding screws when screwing them in is known. In particular, it is provided that when a screw is being screwed in, it is first guided by one or more guide rings in such a way that its degrees of freedom in movement are limited to rotation and axial displacement. For this purpose, the guide rings are inserted into an outer shell or an enveloping body and are also designed in such a way that they expand and release a sufficiently large opening for the screw head to pass through as soon as they have enough space to do so. This should occur as soon as the guide rings leave the constricting area of the enveloping body when the screw is being screwed in and reach a non-constricting area of the same.

From the DE 10 2010 007 175 A1 discloses a device for feeding screws from tubular magazines with a rotatable receiving device for transferring the screw into the area of a screwdriver, the tubular magazine and the screwdriver being arranged paraxially in a common housing pivotable about a likewise paraxial axis of rotation.

From the DE 10 2012 224 045 A1 discloses a screwing system with, inter alia, a screwing tool and a tubular feeding device for automatically feeding screws. The screw system also includes a holding mechanism for the screws, which holds them in a defined alignment with the components to be screwed. For this purpose, the holding mechanism has two jaws which can be rotated in the manner of pliers.

From the DE 20 2011 103 223 U1 a robot is known that can be installed “overhead”, so to speak, and has a turning tool for this purpose. The robot automatically picks up a screw to be screwed from a screw magazine by means of a holding device of the turning tool. The holding device can be designed as a controllable gripper, sucker or tensioner for grasping and holding the screw head of the screw. This publication is silent on the specific design of the holding device.

From the EP 2 665 580 B1 a device for the automated feeding of connecting elements, such as screws, to a processing unit, such as a robot-supported screw driver, is known. The device has a feed hose through which the screw is fed to the screwdriver by means of compressed air.

None of the publications acknowledged above deals with loading a screw into a screw socket of an external screwing unit or with setting a screw in the screw socket of a screwing unit.

According to a first aspect of the invention, it is the object of the same to provide a simple and inexpensive device for receiving and securely setting a screw with a screw head and screw shank in a screw nut of an external screw unit. According to a second aspect of the invention, it is the object of the same to provide a manipulation unit with such a device. According to a third aspect of the invention, it is the object of the same to provide an assembly system with said manipulation unit.

The task is therefore solved by a device for receiving and setting a screw with a screw head and screw shank in a screw nut of an external screw unit, with an outer sleeve, which has a first sleeve end and a second sleeve end, and with an inner sleeve mounted in the same, which inner sleeve is mounted adjustably via a pair of threads with a corresponding outer thread and inner thread in the outer sleeve in such a way that the latter performs a superimposed movement consisting of an axial and a rotary movement, with the inner sleeve being supported axially at one end by means of at least one spring element on the first sleeve end of the outer sleeve The inner sleeve at the other end has a receiving opening for axially receiving a screw shank of a screw that is or can be inserted into the receiving opening with the screw shank first and that is or can be supported axially on the end face of the inner sleeve by means of the screw head e has, and wherein the screw shank is assigned at least one arranged on the inner sleeve clamping means for frictionally locking the screw in the inner sleeve.

With this simple and inexpensive device, automated loading of the screw nut of an external screw is advantageous heit made possible by, based on a relatively complex manual handling of the screw when inserting the same in a screw nut, a movement consisting of an axial and a rotary movement can be carried out, which makes it possible to complete the insertion movement in one step. The screw head is threaded into the corresponding screw socket simply by pressing the device together with the screw held onto the screw socket to be fitted. If required, ie if the screw head and screw nut are not aligned in a form complementary to one another, the screw undergoes a rotational movement about a longitudinal axis of the screw due to the special kinematics inherent in the device.

The dependent claims describe preferred developments or refinements of the invention.

In order to enable smooth handling of the device, the pair of threads has such a thread pitch that solely as a result of the spring force of the at least one spring element on the inner sleeve, the inner sleeve can be automatically adjusted within the outer sleeve.

In order to enable the device to be fitted with a screw to be set without complications, the outer sleeve has a centering cone for the screw to be received on its second sleeve end or forms such a centering cone.

In order to meet the limited accessibility of the screw nut to be loaded, the inner sleeve has a sleeve section that extends axially beyond the second sleeve end of the outer sleeve.

In order to ensure that the screw is held securely in the device, according to a practical embodiment, the clamping means for frictionally locking the screw in the inner sleeve is formed by at least one frictional connection part or elastomer part arranged inside the inner sleeve and/or the sleeve section thereof.

With regard to said inner sleeve with a sleeve section extending beyond the outer sleeve, according to an alternative second embodiment, the clamping means for frictionally locking the screw in the inner sleeve can be formed by at least one frictional connection part or elastomer part arranged within the sleeve section of the same, which can be formed by a radial opening in the wall of the Sleeve portion is biased through by means of an elastomer element or a spring element against the screw shank.

As the invention further provides, the clamping means is set up in such a way that its clamping force is less than the holding force acting on the screw set in the external screw unit or its screw nut.

The invention also relates to a manipulation unit with at least one device of the type described above.

According to a preferred embodiment of the manipulation unit, this is formed by an industrial robot for feeding the screw to the external screwing unit.

The invention also relates to an assembly system with a manipulation unit of the type described above and with an assembly frame for fixing components in the exact position, the assembly frame having at least one screw unit for joining the components to one another using screw(s).

Advantageously, the assembly system has at least one pre-sorting station in which pre-sorted screws are arranged with the screw head down on a pallet in defined positions and are held magnetically by means of permanent magnets or electromagnets. The magnetic mounting of the screws on the pallet opens up the possibility of automated handling of the same, in particular by means of a manipulation unit, such as an industrial robot.

• 1 eine perspektivische Einzeldarstellung eines in einer Montageanlage des Fahrzeugbaus umlaufenden Montagerahmens nach dem Stand der Technik, welcher Montagerahmen mit auswechselbaren Rahmenmodulen bestückt ist,
• 2 eine erste mögliche Ausführungsform einer in ein Rahmenmodul des Montagerahmens nach 1 integrierten Schraubeinheit mit einer Schraubnuss zur Aufnahme einer Schraube,
• 3 eine weitere mögliche Ausführungsform einer in ein Rahmenmodul des Montagerahmens nach 1 integrierten Schraubeinheit mit einer Schraubnuss zur Aufnahme einer Schraube,
• 4 eine schematische Darstellung eines Ausschnittes einer ersten möglichen Ausführung einer erfindungsrelevanten Montageanlage,
• 5 eine schematische Darstellung eines Ausschnittes einer weiteren möglichen Ausführung einer erfindungsrelevanten Montageanlage,
• 6 eine perspektivische Einzeldarstellung eines Industrieroboters der Montageanlage mit mehreren erfindungswesentlichen Vorrichtungen zur Aufnahme und zum Setzen von Schrauben in je eine Schraubnuss einer Schraubeinheit eines Rahmenmoduls des Montagerahmens nach 1 (Ausführungsvariante 1 der besagten Vorrichtung),
• 7 im Hinblick auf eine Vorrichtung nach 5 bzw. 6 eine beispielgebende Versuchsanordnung,
• 8 eine Explosionsdarstellung der Vorrichtung nach 6 bzw. 7,
• 9 die Vorrichtung nach 8 teilweise montiert,
• 10 eine Schnittdarstellung der vollständig montierten Vorrichtung nach 6 bis 9 mit einer aufgenommenen Schraube,
• 11 eine zweite Ausführungsvariante einer Vorrichtung zur Aufnahme und zum Setzen einer Schraube in eine Schraubnuss einer Schraubeinheit eines Rahmenmoduls, 12 eine Schnittdarstellung der Vorrichtung nach 11, und
• 13a-c eine Versuchsanordnung mit der Darstellung der Funktionsweise der erfindungswesentlichen Vorrichtung zur Aufnahme und zum Setzen einer Schraube in eine Schraubnuss einer Schraubeinheit eines Rahmenmoduls.

The invention is explained in more detail below with reference to the exemplary embodiments shown schematically in the drawings. However, it is not limited to these, but covers all configurations defined by the patent claims. Show it:

• 1 a perspective individual representation of a mounting frame rotating in an assembly plant for vehicle construction according to the prior art, which mounting frame is equipped with exchangeable frame modules,
• 2 a first possible embodiment in a frame module of the mounting frame 1 integrated screw unit with a screw nut to take a screw,
• 3 another possible embodiment in a frame module of the mounting frame 1 integrated screw unit with a screw nut to take a screw,
• 4 a schematic representation of a section of a first possible embodiment tion of an assembly system relevant to the invention,
• 5 a schematic representation of a section of another possible embodiment of an assembly system relevant to the invention,
• 6 a perspective individual representation of an industrial robot of the assembly plant with several devices essential to the invention for receiving and for setting screws in a screw nut of a screw unit of a frame module of the assembly frame 1 (Embodiment variant 1 of said device),
• 7 in terms of a device 5 or. 6 an exemplary test arrangement,
• 8th an exploded view of the device 6 or. 7 ,
• 9 the device 8th partially assembled,
• 10 a sectional view of the fully assembled device 6 until 9 with a captured screw,
• 11 a second variant of a device for receiving and for setting a screw in a screw socket of a screw unit of a frame module, 12 a sectional view of the device 11 , and
• 13a-c an experimental arrangement showing the functioning of the device essential to the invention for receiving and setting a screw in a screw nut of a screw unit of a frame module.

1 shows a mounting frame 1 with an example of three interchangeable frame modules 2, 3, 4 for the precise positioning of components not shown in the drawing. This can be an assembly frame 1, which is installed in an assembly plant 5 (cf. 4 and 5 ) of vehicle construction is guided around and used, for example, as already mentioned in the so-called "marriage", in which the chassis and engine are screwed to the body of a vehicle that is not shown in the drawing.

The assembly frame 1 and/or the frame modules 2, 3, 4 comprise several screw units 6 integrated into the same, each of which has a screw socket 7 known per se with a hexagon socket on a free, upper end for receiving a screw 8 or the screw head in a positive and non-positive manner 8a of the same with an external hexagon. As is known, the form-fitting results from the corresponding form-fitting contours of screw socket 7 and screw head 8a, whereas the frictional connection is effected magnetically by the screw socket 7 being assigned a permanent or electromagnet. The screw 8 is placed with its screw shank 8b upwards in the relevant nut 7 before the components to be screwed are placed on the assembly frame 1 and the frame modules 2, 3, 4 of the same as part of the said "marriage" and these are joined together using screws 8 will.

2 shows a screwing unit 6 with a screw socket 7, which screw socket 7 is arranged so to speak in a free-standing manner, ie is fully accessible from the side as well as from above. In contrast, shows 3 a screwing unit 6 with a screw socket 7, which screw socket 7 is bordered laterally by means of two supporting and/or fixing elements 9 arranged opposite one another.

4 shows extremely schematically a section of a first possible embodiment of an assembly system 5 having a peripheral assembly frame 1, for example in vehicle construction. The mounting frame 1 and/or its frame modules 2, 3, 4 have a large number of screw points 10 each having a screw socket 7 and are successively transferred to an assembly area 11 in which said screw sockets 7 are fitted with screws 8. The screws 8 are removed from a screw reservoir 12 by means of a screw conveyor that is known per se and is therefore not shown in the drawing and placed in a storage area 14 that is accessible to a manipulation unit 13, presently in the form of an industrial robot 13a (also referred to as a screw setting robot), namely upright with the screw shank behind above. Four industrial robots 13a are shown here as an example, each of which is assigned a screw reservoir 12 and a storage area 14 each.

The industrial robots 13a are preferably articulated arm robots (cf. 6 ) with more preferably multiple axes of movement. A device 16 for receiving and setting a screw 8 is arranged on an end member 15 of the industrial robot 13a. By way of example, according to 4 and 6 each industrial robot 13a has an element 15, which has a holder 17 with five such devices 16. This makes it possible to take up five screws 8 at the same time and to place them in a screw socket 7 each at the same time or in succession if required or if the corresponding requirements are met.

The assembly plant 5 after 5 differs from the one described above in that a pre-sorting station 18 is assigned to two industrial robots 13a of the type described above. According to this exemplary embodiment, each pre-sorting station 18 has five screw reservoirs 19 . Such a pre-sorting station 18 is provided in particular when screws 8 of different dimensions are to be placed on said screw sockets 7 .

Each screw reservoir 19 is assigned a pre-sorting robot 20, which is known per se and is preferably also designed as an articulated-arm robot, which places screws 8 upright with the screw head 8a down and in defined positions on a pallet 21. In the present case, the pallet 21 is arranged on a conveyor means 22, as a result of which it travels, so to speak, over the pre-sorting robots 20 arranged one behind the other and opposite one another.

In order to store the screws 8 on the pallet 21 in such a way that they do not fall over during the movement and the subsequent pick-up by an industrial robot 13a (screw setting robot), they are fixed to the pallet 21 by means of magnetic force. Said magnetic force is preferably generated by means of a permanent magnet or electromagnet only in said defined positions, which advantageously makes it easier for an industrial robot 13a (screw setting robot) to detach the screws 8 from the pallet 20 simply by laterally displacing the screws 8 . 7 an experimental arrangement can be seen which shows the end member 15 of an industrial robot 13a together with a holder 17 with, for example, four devices 16 for receiving and setting four screws 8, which devices 16 for receiving the screws 8 held on a pallet 21 are arranged above the same . The 8th until 10 A first embodiment of such a device 16 with its individual parts can be seen.

The device 16 accordingly comprises an outer sleeve 23, which has a first sleeve end 24 and a second sleeve end 25, as well as an inner sleeve 26 mounted in the same. The inner sleeve 26 is connected via a thread pairing with a corresponding outer thread 27 of the inner sleeve 26 and inner thread 28 the outer sleeve 23 is mounted adjustably in the latter in such a way that it executes a superimposed movement consisting of an axial and a rotary movement. The inner sleeve 26 is also axially supported at one end by at least one spring element 29, presently in the form of a helical spring, and via a sleeve cover 30, for example in the form of a screw cap, on the first sleeve end 24 of the outer sleeve 23. The pair of threads preferably has such a thread pitch that the inner sleeve 26 can be adjusted easily and automatically within the outer sleeve 23 solely as a result of the spring force of the spring element 29 , in this case the helical spring.

At the other end, the inner sleeve 26 has a receiving opening 31 for axially receiving the screw shank 8b of a screw 8 that is or can be inserted into the receiving opening 31 with the screw shank 8b first and is supported axially on the end face of the inner sleeve 26 by means of the screw head 8a. A centering cone 33 for the screw 8 to be accommodated is formed on the free, second sleeve end 25 of the outer sleeve 23 .

According to 10 A clamping means 32 arranged on the inner sleeve 26 is assigned to the screw shank 8b for at least frictionally locking the screw 8 in the inner sleeve 26 . According to this exemplary embodiment, the clamping means 32 is formed by an elastomer part 32a, for example made of rubber or an elastomeric plastic, which is arranged inside the inner sleeve 26 and is preferably glued in for the purpose of axial fixation. In the present case, the elastomer part 32a is annular. Alternatively, the elastomer part 32a or ring-shaped elastomer part 32a can also be held axially firmly in a recess or ring groove of the inner sleeve 26 by positive locking (not shown in the drawing). In addition, the elastomer part 32a can be dimensioned in such a way that it bears against the inserted screw shank 8b of the screw 8 to be received with a specific pretensioning force, as a result of which a non-positive connection is recorded in addition to the frictional connection.

Fastening means 34 for fastening the device 16 to the manipulation unit 13, in the present case in the form of the industrial robot 13a, are arranged on the outer contour of the outer sleeve 23. According to this exemplary embodiment, the fastening means 34 are formed by two fastening flanges, each provided with a bore, in order to be able to fasten the device 16 to the end member 15 of the industrial robot 13a by means of screws, for example not shown in the drawing.

The embodiment of the device 16 'for receiving and for setting a screw 8 on a nut 7 according to the 11 and 12 differs essentially from the above-described embodiment of the same in that the inner sleeve 26 has a sleeve section 35 that extends axially beyond the second sleeve end 25 of the outer sleeve 23 . In addition, the clamping means 32 for frictionally locking the screw 8 in the inner sleeve 26 by at least a frictional engagement part or elastomer part 32a, not shown in the drawing, which is arranged inside said sleeve section 35 and is formed, which can be pushed through a radial opening, not shown in the drawing, in wall 36 of sleeve section 35 by means of an elastomer element, such as rubber, or by means of a spring element 37, present in Form of an annular spring, is biased against the screw shank 8b. Alternatively, a clamping means 32 can also be provided inside the sleeve section 34 of the inner sleeve 26 of the device 16 ′, which corresponds to that described above for the device 16 .

Based on 13a until 13d and the device 16 for receiving and for setting a screw 8 on a nut 7 according to the particular 8th until 11 the functioning of the same is described below, with a test arrangement being shown here in which the movement sequence, in particular of the end member 15 of the industrial robot 13a, is simulated by manual handling.

According to 13a a device 16 equipped with a screw 8 inserted with the screw shank 8b first into the receiving opening 31 of the inner sleeve 26 is positioned over a screw nut 7 . The nut 7 is based on 2 arranged free-standing, ie fully accessible from the side as well as from above. According to 13b the device 16 is then slipped over the nut 7 with the second sleeve end 25 of the outer sleeve 23 first, with the centering cone 33 of the outer sleeve 23 advantageously supporting the positioning here as well. When the device 16 is further pressed down in the direction of the screw nut 7 against the spring force of the spring element 29, the screw head 8a of the screw 8 ideally penetrates directly into the screw nut 7 and is held there by magnetic force. If such an ideal situation does not exist and the external hexagon of the screw head 8a is not ideally positioned to the internal hexagon of the screw nut 7, but the screw head 8a is supported with its front face on the front face of the screw nut 7, the thread pairing between the outer sleeve 23 and inner sleeve 26 comes into play Effect in that when the device 16 is pressed down, the inner sleeve 26 undergoes a rotary movement until the screw head 8a is ideally positioned to the screw socket 7 and penetrates into its hexagon socket (cf. 13c ). The device 16 can then be lifted off the nut 7 (cf. 13d ). The magnetic force for holding the screw 8 in the screw nut 7 is set so large that when the device 16 is lifted, the holding force of the clamping means 32 of the device 16 is overcome.

If, on the other hand, the screw nut 7 according to 3 edged laterally by means of two oppositely arranged support and / or fixing elements 9, the device 16 'according to 11 and 12 for use (not shown in the drawing). The sleeve section 35 of the inner sleeve 26 protruding from the outer sleeve 23 is dimensioned in such a way that it can be guided between the supporting and/or fixing elements 9 towards the screw nut 7 .

Reference List

1

mounting frame

2

frame module

3

frame module

4

frame module

5

assembly plant

6

screw unit

7

nut

8th

screw

8a

screw head

8b

screw shank

9

Supporting and/or fixing element

10

screw point

11

assembly area

12

screw reservoir

13

manipulation unit

13a

industrial robot

14

lead area

15

final link

16

Device for receiving and setting a screw 8

16'

Device for receiving and setting a screw 8

17

bracket

18

pre-sorting station

19

screw reservoir

20

pre-sorting robot

21

palette

22

funding

23

outer sleeve

24

first sleeve end

25

second sleeve end

26

inner sleeve

27

external thread

28

Inner thread

29

spring element

30

case cover

31

intake opening

32

clamping means

32a

elastomer part

33

centering cone

34

fasteners

35

sleeve section

36

wall

37

spring element

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102008018848 A1 [0008]
• DE 102009053130 A1 [0009]
• DE 102010007175 A1 [0010]
• DE 102012224045 A1 [0011]
• DE 202011103223 U1 [0012]
• EP 2665580 B1 [0013]

Claims (11)

Device (16, 16 ') for receiving and for setting a screw (8) with screw head (8a) and screw shank (8b) in a screw nut (7) of an external screw unit (6), with an outer sleeve (23) which has a first sleeve end (24) and a second sleeve end (25), and with an inner sleeve (26) mounted in the same, which inner sleeve (26) has a thread pairing with a corresponding outer thread (27) and inner thread (28) in the outer sleeve (23) is adjustably mounted in such a way that it performs a superimposed movement consisting of an axial and a rotary movement, with the inner sleeve (26) being supported axially at one end by means of at least one spring element (29) on the first sleeve end (24) of the outer sleeve (23), The inner sleeve (26) at the other end has a receiving opening (31) for axially receiving a screw shank (8b) that is inserted or can be inserted into the receiving opening (31) with the screw shank (8b) first and by means of the screw head (8a) axially screw (8) that supports or can be supported on the end face of the inner sleeve (26), and wherein the screw shank (8b) has at least one clamping means (32) arranged on the inner sleeve (26) for frictionally locking the screw (8) in the inner sleeve (26). assigned. device (16, 16'). claim 1 , characterized in that the thread pairing has such a thread pitch that solely as a result of the spring force of the at least one spring element (29) on the inner sleeve (26), this is automatically adjustable within the outer sleeve (23). device (16, 16'). claim 1 or 2 , characterized in that the outer sleeve (23) at its second sleeve end (25) has or forms a centering cone (33) for the screw (8) to be accommodated. device (16'). claim 1 or 2 , characterized in that the inner sleeve (26) has a sleeve section (35) extending axially beyond the second sleeve end (25) of the outer sleeve (23). Device (16, 16 ') according to one of Claims 1 until 4 , characterized in that the clamping means (32) for frictionally locking the screw (8) in the inner sleeve (26) is formed by at least one frictional locking part or elastomer part (32a) arranged inside the inner sleeve (26) and/or the sleeve section (35) thereof is. Device (16, 16 ') according to one of Claims 1 until 4 , characterized in that the clamping means (32) for frictionally locking the screw (8) in the inner sleeve (26) is formed by at least one frictional locking part or elastomer part (32a) arranged within the sleeve section (35) of the same, which is formed by a radial opening in the wall (36) of the sleeve section (35) is prestressed against the screw shank (8b) by means of an elastomer element or a spring element (37). Device (16, 16') according to one of the preceding claims, characterized in that the clamping means (32) is set up in such a way that its clamping force is less than a holding force acting on the screw (8) set in the external screw unit (6). Manipulating unit (13) with at least one device (16, 16') according to one of the preceding claims. Manipulating unit (13) after claim 8 , characterized in that it is formed by an industrial robot (13a) for feeding the screw (8) to the external screwing unit (6). Assembly system (5), with a manipulation unit (13). claim 8 or 9 and with an assembly frame (1) for fixing components in the exact position, the assembly frame (8) having at least one screw unit (6) for joining the components to one another by means of screw(s) (8). Assembly plant (5) according to claim 10 , characterized in that it also has at least one pre-sorting station (18), in which pre-sorted screws (8) are arranged with the screw head (8a) downwards on a pallet (21) in defined positions and magnetically by means of permanent magnets or electromagnets are/are held.

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