DE8815494U1 - Device for detecting glowing rolled goods - Google Patents

Description

Description Device for detecting glowing rolled goods

The innovation relates to a device with at least one photoelectric infrared detector for detecting self-luminous rolling stock, which is transported on a roller table and can be cooled and whose rollers are cooled with water.

On rolling mills through which self-luminous, e.g. glowing, rolled material is moved, detectors are required to determine the position of the rolled material at various points in order to prepare or initiate the work processes required for further processing of the rolled material. Infrared detectors can be used to detect rolled material, particularly the ends of the rolled material.

The rollers of the roller table on which the rolling stock is moved are heated up considerably by the high temperatures of the rolling stock. In order to prevent any impairment of the strength or shape of the rollers, they are cooled by spraying them with water after and during the rolling stock's passage. More frequent cooling is necessary for high throughputs. This can be achieved, for example, by a large number of spray stations arranged at short intervals. Under certain production conditions, it is necessary to spray or cool the rolling stock itself.

Spray mists, which, depending on the humidity, remain for a certain time even after the water supply has been switched off, impair the correct detection of the rolled goods with infrared detectors. On the other hand,

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Infrared detectors are particularly suitable for the contactless detection of self-luminous rolling stock.

The innovation is therefore based on the task of further developing a device of the type described at the beginning so that the rolling stock can be reliably detected even in the vicinity of spraying and cooling devices with mist formation.

, The object is achieved according to the invention in that a below or above the transport level of the roller conveyor between adjacent rollers arranged optics via an optical fiber with the remote» from the roller table

\ arranged infrared detector is connected so that the optics in the middle of the ' mouth of a cooling air duct surrounding the optical fiber, which is connected to a compressed air source <=ät, and that the cooling air duct is its mouth at 90' or an angle other than 90" to the

' transport plane is inclined. In this device, the light wave

X conductor and the optics are cooled. At the same time, the

' Cooling air leaving the cooling air duct is largely prevented from accumulating dirt on the optics and in the muzzle opening, which can impair the proper functioning of the device. In order to keep the opening at the muzzle as small as possible, the muzzle is closed off in particular in the form of a nozzle.

Depending on the system, the free end of the ^cooling air duct or the optics with their

&bull;j optical axis is inclined at an angle of preferably 45° to the transport plane . It has been shown that with such an inclination, little deposits of scale, moisture or dirt occur on the optics.

It is not important to maintain the angle exactly. The angle

can be between 40" and 90".

It is particularly advantageous if the optical fiber is surrounded by a tube that is arranged inside the cooling air duct. The optical fiber is guided through the tube and fixed in its position. Since cooling air flows along the tube, the inside of the tube and thus also the optical fiber is cooled. However, the optical fiber is not cooled by the cooling air flow.

t subjected to mechanical stress, e.g. caused to vibrate.

In a" practical embodiment, the cooling air duct has a branch with a mouth including a nozzle, which is in the middle

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contains another optic and is at the same level as the optic arranged in the first opening, whereby the other optic is connected to another infrared detector via another optical waveguide. If in this embodiment a detection unit fails, the other unit ensures the detection of the rolled material, in special cases the cooling air duct can be provided with a third branch, in this branch with opening and optic a third optical waveguide opens.

The innovation is illustrated below using a drawing of a Implementation plan described in detail, Features and benefits.

Show it

Fig. 1 a device with a photoelectric infrared detector for detecting rolling stock from the front,

Fig. 2 the device according to Fig. 1 from the right side, partly in longitudinal section.

From a rolling stand (not shown in detail), the rolling stock 1 is transferred to a roller table 2, of which rollers 3, 4, 5, 6 are shown. A device 7 is provided for detecting the rolling stock 1, which is arranged partly between the rollers 3 and 4 below, optionally also above the transport level 8 for the rolling stock 1. The transport level 8 is shown in dashed lines in Fig. 1. A pre-feeding device arranged above is designated with ?5.

The device 7 or 7a contains a photoelectric infrared radiation detector 9 which is set up away from the rollers 3 to 6. The infrared radiation detector 9 is preferably a known device which has a photoelectric receiver which converts infrared light into electrical signals which are monitored for a predeterminable threshold value. The threshold value can be adapted to the respective conditions of the rolling stock 1, e.g. the temperature range which normally occurs.

The infrared radiation detector 9 is coupled with units 9a, 9b to light waveguides 10, 11 and possibly others. For this purpose, an optical device (not shown in detail) can be used, which is located in or on the housing of the infrared radiation detector 9 between the ends of the light waveguides.

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Conductor 10/ 11 and possibly others and the photoelectric receivers are arranged / whose sensitivity range lies predominantly in the infrared

The optical waveguides 10/11 and possibly others are laid in a cylindrical tube 12 which protects them from mechanical damage. The tube 12 runs into the space below or above the roller table, e.g. between the two rollers 3/4. Branches (e.g. 13) extend from the tube 12, in which the optical waveguide (e.g. 10) is guided. At the end of the branch 13 there is an optic 14. The optic 14 directs the incident light to the end of the optical waveguide 10, which is arranged a short distance from the optic U. The branch 13 and the optical axis 15 of the optic 14 are inclined to the transport plane 8 at an angle of approximately 90" to 45'.

The tube 12 merges into an angled end piece 16 which has the same inclination as the branch 13 and which also has an optic 17 at its end. The optical waveguide 11 runs in the end piece 16. The optic 17 is located at the same level as the optic 14 and also matches it in the inclination of its optical axis.

A possible third branch with a third light guide is designed like the two branches mentioned above. In special cases, the optics (14, 17) can be omitted.

The pipe 12 is concentrically surrounded by a cooling air duct 18, which can also be a cylindrical pipe. The cooling air duct 18 does not extend to the infrared radiation detector 9, but begins near the roller table frame 2. The branch 13 is surrounded by a cooling air duct branch 19, which has an opening 20 that is located at the level of the optics 14. The optics 14 is in the middle of the opening 20. The optics 14 can also be offset slightly towards the inside of the cooling air duct branch 19. The opening 20 can be equipped with a nozzle 27 to constrict and accelerate the cooling air.

The end piece 16 is concentrically surrounded by a cooling air duct end piece 21, which has an opening 22 located at the level of the opening 20. The arrangement of the optics 17 within the opening 22 corresponds to the arrangement of the

Optics 14 within the opening 20.

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For further branches, the structure is analogous, cL h« it is also a
Nozzle 26 is provided.

The cooling air channel 18 is connected via a connector 23 and a valve 24 to a compressed air channel 25 of a compressed air source (not shown) which generates air pressure of several bar.

The pressurized cooling air fed into the cooling air duct 18 flows along the pipe 12, the branch 13 and possibly further branches (one of which is shown in dashed lines in Fig. 2 and designated mix 29 ) and the end piece 16 and leaves the device 7 through the openings 20, 22 of the nozzles 26, 27. In this process, the pipe 12, the branch 13 and others, the end piece 16, the optics 14, 17 and others and the optical fibers 10, 11 and others located in the pipe 12, the branch 13 and others and the end piece 16 are cooled. Due to the high temperatures of the rolling stock 1, it is advantageous if the optics 14, 17 and others and the optical fibers 10, 11 and others can withstand temperatures of up to at least 300 °C.

The cooling air exiting from the openings 20, 22 or 26, 27 simultaneously prevents dirt, dust, scale, moisture and other deposits from contaminating the optics 14, 17 and possibly others and thus disrupting the proper operation of the device 7.

The use of multiple optics and multiple optical fibers results in redundancy that is not necessary in some applications. In this case, branch 16 with optics 17, optical fiber 11 and cooling air duct branch 21 are sufficient, while the others can be omitted.

The tube 12 can end in front of the infrared detector input, in which case, to protect the free light guide 11, an armored protective hose 28 is mounted between the end of the tube 12 and the optical coupling device of the infrared detector 9.

Claims (1)

·· Otter <· t 4 44» 4 t I 1 « < «<< « Xi liti at Protection claims Device for detecting glowing rolled goods I 1. Device with at least one photoelectric infrared radiation " detector for the detection of self-luminous rolling stock _x that is on a roller conveyor whose rollers are cooled with water, &iacgr; characterized, ' that a below or above the transport level (8) of the roller table (2) '.. optics (17) arranged between adjacent rollers (3, 4) via a I Optical fiber (11) with the remotely located roller table (2) ,'. Infrared radiation detector (9) is connected, that the optics (17) in the i the mouth (22) of a surrounding optical waveguide (11) I cooling air duct is arranged and that the cooling air duct (18) is at its :ü
% Hinging (22) is inclined at 90' or an angle other than 90* to the transport plane (8). j 2* Device according to claim \,
' characterized, that the mouth (22) is nozzle-shaped. 3. Device according to claim 1 or 2,
characterized, that the free end of the cooling air duct (18) is inclined at an angle of up to about 45° to the transport plane (8). 4. Device according to one or more of the preceding claims,
characterized, that the optical waveguide (11) is surrounded by a tube (12) which is arranged within the cooling air duct (18). 5. Device according to one or more of the preceding claims,
characterized, that the cooling air channel (18) has a branch (19) with a beak (20) including a nozzle (27) which contains a further optic (U) in the middle and is at the same level as the optic (17) arranged in the first beak (22), and that the further optic (14) is connected to a further infrared radiation detector (9) via a further optical waveguide (10). 6. Device according to claim 5, characterized in that the infrared radiation detectors (9a, 9b) are arranged in separate housings or in a common housing. 7. Device according to one or more of the preceding claims, characterized in that the cooling air duct (18) has a third branch (29) with an additional optic and an additional light guide, which is connected to an additional infrared radiation detector. &bull; t · t I # *** Mt***« I (I ii* 1|« &igr; Il I