Pulling Device for a Pultrusion Device

Abstract

A pulling device is provided for a pultrusion device, having at least one clamping device that can be moved in a pultrusion direction. The clamping device is designed to frictionally seize a pultruded profiled strand to be conveyed, in order to apply a tensile force to the profiled strand. The clamping device has at least three clamping jaws that can be moved in relation to each other, for peripherally clamping the profiled strand.

Claims

1. A pulling device for a pultrusion device, comprising: at least one clamping device displaceable in a pultrusion direction, the clamping device being configured to grip in a force-fitting manner a pultruded profiled strand to be conveyed, in order to apply a tensile force to said pultruded profiled strand, wherein the clamping device comprises at least three clamping jaws moveable in relation to one another to peripherally clamp the pultruded profiled strand.

2. The pulling device according to claim 1, wherein each clamping jaw comprises one clamping face that contacts an external contour of the profiled strand over a surface area.

3. The pulling device according to claim 2, wherein the clamping faces of the clamping jaws define an internal contour of the clamping device configured so as to be complementary to the external contour of the profiled strand to be clamped, the internal contour of the clamping device enclosing a receptacle space for the disposition of the profiled strand.

4. The pulling device according to claim 1, wherein the clamping jaws are part of a collet comprising a cone-shaped external contour and longitudinal slots for mutually separating the clamping jaws, a collet receptacle has an internal cone configured so as to be complementary to the cone-shaped external contour, the collet receptacle being provided for closing the collet and pressing the clamping jaws in order to clamp the profiled strand.

5. The pulling device according to claim 4, wherein the clamping jaws are part of a collet comprising a cone-shaped external contour and longitudinal slots for mutually separating the clamping jaws, a collet receptacle has an internal cone configured so as to be complementary to the cone-shaped external contour, the collet receptacle being provided for closing the collet and pressing the clamping jaws in order to clamp the profiled strand.

6. The pulling device according to claim 5, wherein the internal contour defined by the clamping jaws is configured to be round, oval or polygonal.

7. The pulling device according to claim 3, wherein the internal contour defined by the clamping jaws is configured to be round, oval or polygonal.

8. The pulling device according to claim 1, wherein the clamping directions of the moveable clamping jaws converge in a common center.

9. The pulling device according to claim 6, wherein the clamping directions of the moveable clamping jaws converge in a common center.

10. The pulling device according to claim 8, wherein the clamping jaws each are moveable in a radial direction toward the common center.

11. The pultrusion device, comprising a pulling device according to claim 1.

12. The pultrusion device according to claim 11, wherein the pulling device comprises two clamping devices configured to be moveable in an alternating manner in the pultrusion direction and being configured to contact the profiled strand in an alternating manner in order to apply the tensile force.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic diagram of a pultrusion device according to the prior art.

[0028] FIG. 2 is a cross-sectional view of a clamping device for a pulling device of a pultrusion device according to the prior art.

[0029] FIG. 3 is a cross-sectional view of a clamping device having a number of clamping jaws according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0030] A pultrusion device 10 for the production of fiber-reinforced profiled components 20 is illustrated in FIG. 1. In a first step, reinforcement fibers 12, for example from glass or carbon fibers, that are kept ready on wound packages 11 are drawn off from the wound packages 11, and in an impregnation tool 13, are impregnated with a matrix, for example a resin. The impregnated fibers 12 are pre-oriented in a pre-molding tool 14, in order for said impregnated fibers 12 in a subsequent step by use of a pultrusion tool 15 to be brought into the final profiled shape and cured. A profiled strand 16 thus produced with the aid of a pulling device 17 is continuously pulled through the individual processing stations 13, 14, 15 and is finally supplied to a cutting tool 18 in order for segments of a defined length, that is to say the profiled components 20, to be severed.

[0031] The pulling device 17 comprises two clamping devices 17a, 17b, which each in the pultrusion direction P of the pultrusion device 10 are displaceable between an initial position and a terminal position. In order for the profiled strand 16 to be continuously moved through the pultrusion device 10, the two clamping devices 17a, 17b are mutually displaced in an alternating manner.

[0032] FIG. 2 shows chucking jaws 21, or clamping jaws 21, respectively, that are usually employed and are configured in pairs so as to clamp the profiled strand 16 from two opposite directions I, II, in order for a pulling force to be introduced into the profiled strand 16. The clamping jaws 21 are typically configured as flat faces, or have an internal contour 22 that is partially adapted to the profiled strand 16. By virtue of clamping on both sides, a deformation of a cross section of the profiled strand 16 can arise in that the latter yields laterally.

[0033] FIG. 3 shows a clamping device 30 having a number of clamping jaws 31a-e for a pulling device of a pultrusion device (not illustrated). The clamping device 30 is designed for gripping in a force-fitting manner the pultruded profiled strand 36 so as to apply a pulling force to the profiled strand. To this end, the clamping device 30 for peripherally clamping the profiled strand 36 has, for example, five clamping jaws 31a-e that are movable in relation to one another. Each of the clamping jaws 31a-e has one clamping face 32a-e for contacting an external contour of the profiled strand 36 over a surface area (not-punctiform).

[0034] On account thereof, it is possible for the clamping faces 32a-e of the clamping jaws 31a-e to define an internal contour of the clamping device 30 that has a round cross section and that is designed so as to be complementary to an external contour 37 of the profiled strand 36 to be clamped that has a round cross section, and that encloses a receptacle space A for the disposition of the profiled strand 36. The profiled strand 36 is thus substantially completely enclosed in the circumferential direction such that a clamping force is introduced into the profiled strand 36 all around the latter, preventing lateral yielding of the profiled strand 36 in the case of an impingement with a clamping force.

[0035] Accordingly, the clamping jaws 31a-e are disposed in a circular manner such that the clamping directions of the movable clamping jaws 31a-e converge in a common center Z. In the embodiment illustrated, the common center Z is identical to the center M of the profiled strand 36. In the case illustrated, the clamping directions K.sub.a-e are identical to the radially directed movement directions (not separately illustrated) of the clamping jaws 31a-e such that the clamping jaws 31a-e each are movable in a radial direction toward the common center.

[0036] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.