DE29606991U1 - Device for heating profiled surfaces by means of thermal radiation - Google Patents

Description

Device for heating profiled surfaces by means of thermal radiation

The invention relates to a device for contactless heating of, in particular, profiled surfaces by means of heat radiation according to the preamble of claim 1.

Heating of profiled surfaces (workpieces), for example door panels, parcel shelves or dashboards of motor vehicles, may be necessary before they are laminated.

In the devices known from the state of the art, such as laminating systems, flat infrared radiators were mounted on supports whose distance from the workpiece surface to be heated was adjustable and whose inclination with respect to the workpiece surface could be adjusted by tilting around one or two mutually perpendicular axes. The flat infrared radiators were arranged at a distance over the entire surface to be heated, whereby curved tubular heaters had to be arranged in addition in order to be able to heat even poorly located surfaces.

The known heating devices had to be individually adapted to the contour of the workpieces (surfaces) to be _heated due to the tubular heating elements being bent specifically for the specific application. This meant that, on the one hand, the heating device was not flexible enough to accommodate modified profiled surfaces. On the other hand, a large number of specially manufactured radiators were necessary, which meant that the investment costs for setting up the heating device and the cost of spare parts in the event of failure of individual radiators, particularly the specially bent tubular heating elements, were very high. Since the specially bent tubular heating elements in particular were not manufactured in sufficient quantities in stock, a failure of these radiators could result in the system being down for a long time.

The object of the invention is to create a device for contactless heating of profiled surfaces in particular, which enables uniform and targeted heating even of the surfaces in poorly positioned areas, which is flexible, can be adapted quickly and easily to a changed contour of the profiled workpiece to be heated and which also enables the heating field to be reused on other workpieces or systems. A further object is to create a device in which the need for specially shaped heating elements can be dispensed with in order to minimize the investment costs.

These objects are achieved by a device designed according to the subject matter of claim 1. In a device according to the invention, the radiation bodies are each arranged in a matrix-like manner on a base plate so that they can be moved relative to one another by means of an adjustment device, with at least some of the radiation bodies emitting three-dimensionally. The use of radiation bodies emitting three-dimensionally has the advantage that on a tilting device

for the individual radiation bodies can be dispensed with. The three-dimensionally radiating radiation bodies can be used in particular to heat those areas of the profiled goods (workpiece) where the contour deviates from a flat, two-dimensional shape. Unirradiated areas, which can occur due to the sometimes necessary, extreme inclination of the two-dimensionally radiating radiators, are avoided with the device according to the invention.

Preferably, the individual radiation bodies move parallel to one another. Advantageously, the radiation bodies are detachably mounted at one end of a lifting element, so that the radiation bodies can be easily adapted to the profiled contour of the workpiece using the adjustment device and the lifting element. Preferably, the movement of the lifting element is electromagnetic, so that the entire device mounted on the base plate can only be operated electrically, since in this case both the energy for operating the radiation bodies and the energy for moving the radiation bodies are provided by the same form of energy (electrical). Alternatively, the lifting elements can also be adjusted pneumatically, mechanically or hydraulically.

A further advantageous embodiment can be achieved if each radiation body has a screw socket with which the radiation bodies can be attached to the lifting element. A screw socket enables simple and quick replacement of defective radiation bodies or radiation bodies that need to be replaced.

In order to achieve the best possible adaptation even with heavily profiled or multi-profiled workpieces, it is preferable that the number of radiation bodies is made as large as possible, for which the transverse dimension of the radiators in relation to the base plate should be as small as possible

should. Point-shaped beam sources that are spherical or pear-shaped can be used advantageously. With these beams, the number and thus the adaptability of the device to the contour of the workpiece to be heated can be optimized.

In order to reduce the energy required to heat the workpiece, some or all of the radiators can have reflectors that limit or focus the radiation direction. A further advantageous design is achieved if the spherical or pear-shaped surface on the radiation side of the point radiation sources has radiation-influencing depressions that can be used to further deflect the heat rays used for heating.

For the purposes of the invention, radiation bodies are understood to mean in particular dark radiators, but also lamps with which energy is emitted using thermal radiation, preferably infrared radiation, which is transferred contactlessly to the workpieces to be heated and absorbed by them.

Further advantages of the invention will become apparent from the following description of a preferred embodiment. The drawing shows:

Fig. 1 is a sectional side view of a device according to the invention;
30

Fig. 2 shows a device according to the invention in the unactuated state;

Fig. 3 shows a device according to the invention in plan view; and 35

Fig. 4 shows an example of a usable heat radiator.

Fig. 1 shows a simplified representation of a section through a device 100 according to the invention for heating a workpiece 10. Lifting elements in the form of support rods 4 are arranged on a base plate 1 on a common carrier 2 in guides 3. Radiating bodies 5', 5'', ... are detachably mounted at one end of the support rods. The guides 3 of the support rods 4 enable them to move parallel to one another relative to one another. The stroke of the support rods 4 determines the position of the radiation bodies 5', 5'', ..., which can be optimally adapted to the contour of a workpiece 10 shown as an example.

As is clear from the illustration, if the contour of the workpiece changes, only the position of the radiation bodies 5', ... needs to be changed by moving the support rods 4 in order to evenly supply the radiation energy to the areas of the workpiece to be irradiated. For this purpose, a schematically shown adjustment mechanism 6 is used, which moves the support rods 4, for example electromagnetically - up or down in the drawing. In the workpiece shown, the radiation bodies 5 ^iiix and 5 ^vi could radiate three-dimensionally (dashed), while the other radiation bodies shown only need to radiate flatly.

Fig. 2 shows a longitudinal section through the device, with all the radiators 5', 5 ^' , ... shown in a retracted position, ie drawn into the base body 1. The radiators 5 have a screw socket 8 (Fig. 4) which can be screwed into a porcelain base 7 attached to the support rod 4 and is known to the person skilled in the art.

Instead of an electromagnetic drive, the radiator carriers can also be moved manually by sliding or by

Rotating a spindle. The support rods 4 can be tubular, for example, so that the cables required to supply energy to the beam source can be guided through the inner cross-section of the support rods. The control unit, which is also used to connect the device, is designated 13. It is noted that cables, lines, etc. have been omitted in all illustrations.

Fig. 3 illustrates the matrix-like arrangement of the individual beam sources. With spherical or pear-shaped beam sources 5, the individual beam sources 5', 5''... can be arranged very close to one another. In order to increase the flexibility of the device, preferably not only the adjustment device of the individual radiation bodies 5', 5'',... but also the energy supply can be individually controlled and/or regulated via the control unit 13, so that when the device 100 is used for workpieces whose dimensions are smaller than the dimensions of the surface of the device 100 provided with the radiation bodies 5, the emitters that are not required can be switched off, thereby achieving more optimal energy utilization.

The radiation body 5 shown in Fig. 4 has a known screw socket 8 which fits together with the porcelain base 7 of the support rods 4 (Fig. 2). With an overall spherical design of the glass bulb 9, the right-hand radiation surface 11 of the glass bulb 9 in the drawing is designed with dimple-shaped depressions 12 which enable a high three-dimensional deflection of the light rays emitted by the radiation source.

List of reference symbols

1 base plate

2 carriers

3 guided tours

4 support bars

5, 5 ' , . . . Radiating body

6 Adjustment mechanism

7 Porcelain base

8 screw socket

9 glass bulbs

10 Workpiece

11 Radiating surface

12 recesses

13 Control unit

100 Radiation device

Claims (8)

1. Device for heating, in particular profiled surfaces, by means of thermal radiation, wherein radiation bodies which can be moved relative to one another by means of an adjusting device are arranged on a base plate in a matrix-like manner, characterized in that at least some of the radiation bodies (5, 5',...) have a three-dimensional radiation direction. 2. Device according to claim 1, characterized in that the radiation bodies (5, 5';...) are detachably mounted at one end of each lifting element (4), and that the lifting elements are movable by means of the adjusting device (6). 3, Device according to claim 2, characterized in that the lifting element (4) is electromagnetically movable. 4. Device according to one of claims 2 or 3, characterized in that the radiation bodies (5, 5',...) each have a screw socket (8) by means of which the respective radiation body can be fastened to the associated lifting element. 1)40210 W'SSI-l.nuUF MCI,V.\Wsilwi\&fr*2t iin.l5 ^: cSt?5*'^Hi>» M.' 40 '211 116 HS -20 40 &iacgr; 201 /84 2.TO-2O 5. Device according to one of claims 1 to 4, characterized in that the radiation bodies (5, 5',...) are point-shaped radiation sources. 6. Device according to one of claims 1 to 5, characterized in that the radiation bodies (5, 5', 5'') are spherical or pear-shaped. 7. Device according to one of claims 1 to 6, characterized in that the radiation direction of at least some of the radiation bodies is limited and/or directed, in particular by means of reflectors. 8. Device according to one of claims 5 to 7, characterized in that the radiation-side surface (11) of the radiation bodies (5, 5 ^f ,...) has depressions (12) influencing the direction of the radiation.