DE102009021256A1 - Actively driven screwing device has rotary screw drive, where linear drive is provided, by which inner screwing unit and outer screwing unit are moved relatively in coaxial manner - Google Patents

Abstract

The actively driven screwing device has a rotary screw drive, where a linear drive is provided, by which an inner screwing unit and an outer screwing unit are moved relatively in a coaxial manner. The common axial direction is considered between a relative position of the inner screwing unit and the outer screwing unit, where the inner screwing unit is active. An independent claim is also included for a method for deploying a screwing medium.

Description

The The present invention relates to an actively driven screw device with a, in particular electric, rotary screw drive and a method for providing a screwing means.

For screwing with electrical screw systems, a nut is used. The Nut has the same wrench size like the screw head to be screwed on. Should now several and different sizes Screws must be tightened on the screw spindle of the electric Screwing the tool to be changed.

For automated Applications, such as B. screwdrivers, will be for different models as well different sizes Wheel bolts or nuts used. The handling of the different Sizes required Measures are consuming, expensive, time-consuming and error-prone.

The previously known solutions are primarily for a manual operation intended. There is a smaller wrench size inside the nut spring-mounted. It will start with the manual if necessary by the Screw head pushed back. The Lifespan is very low. Likewise, the torque to be transmitted is more likely for the designed for manual assembly. A process monitoring does not take place.

It The object of the present invention is an improved active driven screwing device as well as an improved method to provide for providing a screw means.

These The object is achieved by an actively driven screwing device according to claim 1 and a method of providing a screw means according to claim 9 solved.

Of the The present invention is based on the finding that with a screwing device comprising an inner and an outer screw means has, a change in the screw size of the screw simplified can be. In addition, the possibility created that a change of the screw size less error-prone, in particular process-safe, can be represented.

Of the inventive approach can be beneficial in automatic and semi-automatic assembly and used in automatic and semi-automatic assembly lines become. Through automation, different, adapted to the screw size Torques are created. Furthermore, the automation is no manual change required.

there There are a number of advantages. That's a safe attitude the needed Key-width (SW) possible. The controlled presetting of the wrench size enables the screw head to be reliable being found. It results in an easier threading on the screw head. There is no counterforce to overcome since a waiver of the spring used in known systems is made possible. additionally is to achieve a long service life with high torques.

One Changing the screw can according to the invention with only one screw and performed without time-consuming tool change. With the screwing tool according to the invention This requirement can be automated and, in particular, monitored reliably Fulfills become. So it will be a fast and especially reliable monitored Switching the wrench size on the screwing tool, z. For example Screws and nuts, possible.

The The present invention provides an actively driven screwdriver with a, in particular electric, rotary screw drive, characterized that a linear drive is provided, by means of which an inner Screw means which coaxially in or partially in an outer screw means is arranged, and the outer screw means in terms of coaxially relative to their common axial direction to move between a first relative position in which the inner screw means is active, and a second relative position in which the outer screw means is active.

active may mean that the respective screw / screw nut is in an engaged position. In the engaged position is a Screw the appropriate size through the screw, in particular process reliable, ie z. B. in terms of Intervention reproducible and measurable or by simple measurement verifiable, recorded and can be screwed in or unscrewed.

According to one embodiment can the drive shaft of the rotary screw drive against the Screw axis of the screw to be moved radially parallel, wherein a transmission means may be provided which the drive torque on at least one of the screw transmits. This makes it easier in or on the drive shaft to provide a switch, with the between the first and the second relative position can be switched.

When Gear means may be provided an attachment gear.

As a rotary screw drive, a pneuma be provided table, hydraulically or electrically driven spindle drive. It can be used on known spindle drives, for example, are already used in automatic or semi-automatic assembly systems.

When Linear actuator can be a pneumatic cylinder, a hollow shaft motor, a electric linear drive or an electric solenoid provided be. A corresponding selection for the linear drive can accordingly be selected according to the respective requirements or circumstances.

According to one embodiment At least one sensor may be provided, which, in particular, is reliable, can detect the first and the second relative position and in particular to an evaluation unit, for. As a controller can communicate. In this way, a changeover between the relative positions can be monitored and displayed.

For example a first sensor, the first relative position and / or a second Sensor detect the second relative position. Such an arrangement is easy to realize.

Further can the drive shaft substantially in the manner of a hollow shaft be configured and through the hollow shaft, an actuator of the Linear drive passed be or vice versa. This way is a simple and secure Operation possible.

The The present invention further provides a method of providing a screw means of an actively driven screwing device with a, in particular electric, rotary screw drive, wherein the screw device an internal screw means, an external screw means and a linear drive, wherein the inner screw means coaxially disposed in or partially within the outer screw means is, and wherein the inner screw means in a first relative position and the outer screw means is active in a second relative position, wherein the method the following steps include: receiving information about whether the outer screwdriver or the inner screw means to be activated; Press the Rotary Schraubantriebs around the inner screw means and the outer screw means with respect to them move common axial direction coaxially relative to each other, so the inner screw means and the outer screw means are dependent on the information either the first relative position or the second Assume relative position.

According to the invention, several necessary steps to be done in one. It is not a constant tool change necessary and a secure finding of the screw head is guaranteed.

The Invention will be exemplified below with reference to the accompanying drawings explained in more detail. It demonstrate:

1 a schematic representations of a screwing device, according to an embodiment of the invention; and

2 a flowchart of a method, according to an embodiment of the invention.

Same or similar Elements can provided in the following figures by the same or similar reference numerals be. Further included in the figures of the drawings, their description and the requirements numerous features in combination. It is clear to a person skilled in the art that these features are also considered individually or to others, summarized here not explicitly described combinations can be.

1 shows a schematic representation of a screw device according to an embodiment of the present invention. It may be an actively driven screwdriver with a rotary screw drive.

According to this embodiment, the screwing device has a tool 1 and a deliverable tool 2 on. The tool 1 is as an internal screw and the deliverable tool 2 is designed as an external screw. Here is the deliverable tool 2 so in the tool 1 It integrates it completely or partially from the tool 1 is enclosed. The screwing device further comprises an actuator 3 , a drive shaft 4 , a gearbox 5 in the form of an attachment gear and a screw spindle 6 on. The tool 1 , the deliverable tool 2 and the drive shaft 4 are arranged coaxially with each other. The tool 1 can be at one end of the drive shaft 4 fixed or exchangeable attached.

The actuator can be inside the drive shaft 4 be arranged and by one, the tool 1 opposite end of the drive shaft 4 be served from. The actuator may be configured to receive the deliverable tool 2 between a first relative position and a second relative position to move back and forth. To take the first relative position, the deliverable tool 2 from the drive shaft 4 be moved away. In the first relative position, a nut to be screwed or a screw head to be screwed into the deliverable tool 2 be introduced. To enable this, one, the drive shaft 4 opposite first end the deliverable tool in the first relative position with a corresponding first end of the tool 1 complete or project beyond this. Alternatively, the first end of the deliverable tool may be 2 in the first relative position still within the tool 1 ensuring that the deliverable tool 2 to be taken mother or the male screw head sufficiently far into the deliverable tool 2 can be introduced to safely transmit the required torque. In the second relative position, a nut to be screwed or a screw head to be screwed sufficiently far into the tool 1 be introduced to safely transmit the required torque. To take the second relative position, the deliverable tool 2 within the tool 1 in the direction of the drive shaft 4 to be moved. For example, one of the drive shaft 4 facing end of the deliverable tool 2 in the second relative position on the drive shaft 4 or on one of the drive shaft 4 facing the end of the tool 1 abut or be a gap away.

The tool 1 and the deliverable tool 2 can each be designed as a nut and at the opposite end of the drive shaft each have an opening. In the opening, a screw head or a nut can be inserted. The deliverable tool has an outer diameter that is smaller than an inner diameter of the tool 1 is. Thus, between the tool 1 and the deliverable tool 2 There may be a gap large enough to accommodate the deliverable tool 2 in the tool 1 to be able to move back and forth and which may be small enough to allow torque transmission between the tool 1 and the deliverable tool 2 to enable.

The screw spindle 6 can be parallel to the drive shaft 4 be arranged and over the gear 5 be coupled with this. Thus, a torque of the screw 6 over the transmission 5 on the screw spindle 4 and on the tool 1 and optionally on the deliverable tool 2 be transmitted.

In the 1 shown screwing device may further include a first sensor 7 and a second sensor 8th and a switch 9 exhibit. The switch 9 can at a the tool 1 be arranged opposite end of the drive shaft. With the switch 9 can the actuator 8th be operated according to the deliverable tool 2 move back and forth between the relative positions. A corresponding position of the deliverable tool 2 can by means of the sensors 7 . 8th be recorded. This can be done by the sensors 7 and 8th For example, be configured to a position of the actuator 3 or the switch 9 capture. For example, the first sensor 7 be formed to detect the first relative position and the second sensor 8th may be configured to detect the second relative position. The sensors 7 . 8th may have an interface to provide information about the detected relative position. Furthermore, the switch 9 have an interface over which an instruction for switching between the relative positions can be received.

The screwing device according to the invention may be suitable for automated applications. For example, the screw device can be used as a wheel screwdriver in the vehicle area. With such a wheel screwdriver wheel bolts or nuts can be screwed or loosened. Different vehicle models can have different sized wheel bolts or nuts. These may be due to the tool 1 and the integrated deliverable tool 2 be handled with one and the same helicopter, without a tool change is required. Thus, at least two different key widths can be provided by the screwing device, between which can be switched. However, the screw device according to the invention can also be provided for any other application areas in which, for example, an alternate provision of different tool sizes is required.

According to this embodiment, the screw spindle 6 instead of a straight output a front-mounted gearbox 5 on. The attachment gear 5 has a provided with a through hole Schraubabtrieb on. On this screwdriver is a screw nut 1 mounted, which has the largest required wrench size. In the cavity of the nut 1 is another screwing tool, z. As a hexagonal element, Torx, or double hexagon 2 , or a crown or a "Surface Drive" nut attached, which has the diameter for the smaller key width. This element 2 preferably has only the task of positively receiving the screw head and when tightening the counterforce generated by the screw head to the outer walls of the screw nut 1 continue to lead.

The actuator 3 can be designed as an actuator shaft and be designed to selectively use 2 to push forward or backward. With the sensors 7 . 8th the respective position can be monitored.

Through the attachment gear 5 is the screw bachse relative to the spindle axis radially and coaxially shifted so that geometric space for the arrangement of a direct linear drive for linear displacement of one of the two Schraubnussgrößen 1 . 2 is available. It is preferably the interior 2 postponed.

The torque is from the screwdriver on the outer tool 1 on the positive internal tool 2 applied.

The resulting counter torque in the final tightening phase supports the inner tool 2 so to speak, on the outer tool 1 from.

The linear drive for moving the inner tool 2 is rotatably supported, as the output shaft 4 The screwdriver should also turn or turn. Because of the two screw nut sizes 1 . 2 In particular, are arranged coaxially on one and the same axis, the tool change is reliable. The two sensors 7 . 8th also contribute to process reliability. The sensors 7 . 8th may also be omitted.

The Linear displacement can z. B. by pneumatic cylinder or solenoid or realized by means of other linear drives. A solenoid would z. B. be used if there is no compressed air at the system.

The drive shaft 4 can a hollow shaft and the screw axis of the actuator 3 be arranged coaxially in the center.

In 1 is by the reference numeral 1 the larger hexagon and by reference numerals 2 the smaller hexagon designates. Instead of a hexagon all other Schraubwerkzeugformen, z. As a crown, Torx, double hex, or other special forms are used.

Such Crowns can be inserted and in the bows the outer crown can be moved in the form of a crown, so that the use of a Change to the smaller wrench size will be produced.

The smaller screw nut 2 (eg M17) should in the embodiment shown when using the larger Schraubnuss 1 (eg M19) are retracted so far that the screw nut 1 a screw in its entire hex height completely without obstruction by the internal Schraubnuss 2 can absorb axially. This is the screw nut 1 designed accordingly deep. The sizes M17, M19 are given here only as an example. In particular, the sizes may be interchangeable. For example, that tool 1 and the deliverable tool 2 nestable and on the actuator axis 3 and drive shaft 4 be placed and removable from these.

The actuator axis 3 and the drive shaft 4 are torsionally stiff, z. B. positively, but axially displaceable to each other. For example, the actuator 3 Driving lock elements with the drive shaft 4 over part of its length or its entire length, e.g. B. hexagonal shape, have.

The drive shaft 4 can also be designed as a simple, round shaft, the only on the receiving side of the tool, for. B. a thread for attachment of the inner tool 2 can carry. The takeaway will then be carried out in particular alone by the positive connection of the tool.

2 FIG. 12 shows a flow chart of a method for providing a screw means of an actively driven screwdriver according to an embodiment of the present invention. The screwing may be, for example, based on 1 act described screwing.

In a first step 21 receiving information may be provided as to whether the outer screw means or the inner screw means should be provided and thus activated. The information can be provided as an electrical signal via an interface to the screwing device, for example. In response to the information, in a second step 22 an actuation of the rotary screw drive done. By means of the rotary screw drive, the inner screw means and the outer screw means with respect to their common axial direction can be moved coaxially relative to each other. If the information indicates that the inner screw means is to be activated, the operation of the rotary screw drive can be such that the inner screw means and the outer screw means are moved relative to each other in the first relative position. If the information indicates that the external screw means is to be activated, the operation of the rotary screw drive can be carried out so that the inner screw means and the outer screw means are moved relative to each other in the second relative position. The described steps can be repeated as required according to the required tools.

The exemplary embodiments shown are chosen only by way of example and can be combined with one another. The claims are merely formulation suggestions without any limiting effect on the disclosure. Also feature combinations from the description in each Combination, especially without the claims, is included in the disclosure. Also, the claim hierarchy does not limit the disclosure, so that each subclaim defined a separate disclosure scope and can be claimed independently or in combination with other features of the claims and / or the description.

1

Tool

2

zustellbares Tool

3

actuator

4

drive shaft

5

Reduction gear

6

screw

7

sensor 1

8th

sensor 2

9

switch

Claims (9)

Actively driven screwing device with a, in particular electric, rotary screw drive, characterized in that a linear drive is provided, by means of which an inner screw means, which is coaxially arranged in or partially in an outer screw means, and the outer screw means with respect to their common axial direction coaxially relative to shift between a first relative position in which the inner screw means is active, and a second relative position in which the outer screw means is active. Screwing device according to claim 1, characterized that the drive shaft of the rotary screw drive against the Screw axis of the screw is displaced radially parallel, wherein a transmission means is provided which the drive torque at least one of the screw transmits. Screwing device according to claim 2, characterized in that that is provided as a transmission means an attachment gear. Screwing device according to one of claims 1 to 3, characterized in that as rotary screw drive a pneumatic, provided hydraulically or electrically driven spindle drive is. Screwing device according to one of claims 1 to 4, characterized in that as linear drive a pneumatic cylinder, a hollow shaft motor, an electric linear drive or an electric Solenoid is provided. Screwing device according to one of claims 1 to 5, characterized in that at least one sensor provided is the first - in particular process-reliable and the second relative position detected and in particular to a Evaluation unit, z. As a controller communicates. Screwing device according to claim 6, characterized a first sensor is the first relative position and / or a second one Sensor detects the second relative position. Screwing device according to one of claims 1 to 7, characterized in that the drive shaft substantially is designed in the manner of a hollow shaft and through the hollow shaft an actuator of the Linear drive passed is or vice versa. Method for providing a screwdriver an actively driven screwing device with a, in particular electric, rotary screw drive, the screwing device an internal screwdriver, an external screwdriver and a linear drive, wherein the inner screw means coaxially disposed in or partially within the outer screw means is, and wherein the inner screw means in a first relative position and the outer screw means is active in a second relative position, wherein the method the following steps include: Receiving information about that, whether the outer screw means or the inner screw means to be activated; Press the Rotary screw drive around the inner screw and the outer screw in terms of move their common axial direction coaxially relative to each other, so that the inner screw means and the outer screw means are dependent on the information either the first relative position or the second Assume relative position.