DE1815522A1 - Sensor arrangement - Google Patents

Description

Sensing arrangement The invention relates to a sensing arrangement for Establishing the presence of a body.

According to a feature of the invention, the device comprises radiation generating means to direct a jet of fluid on a predetermined path such that that the body that touches the ray block that ray or turn it into one Can reject deflection path to which the beam adheres to the body, and that beam sensor aligned on at least one of the paths to the presence or absence of the beam.

The arrangement preferably has a housing with an interior space for receiving the body and the beam generating means are arranged in such a way that the fluid is directed so that the predetermined path is over it Space stretches.

Several beam generating means can also be provided.

At least some of the latter can be parallel to one another in this way be aligned so that parallel beams are generated. Besides, at least w can some of the beam generating means may be inclined relative to one another so that they are non-parallel Rays are generated.

Several beam detectors can also be provided, if more is provided as a jet generator. In this case, by appropriate choice The number, size, and spacing of the rays ensure that the body is one Deflection causes at least one beam if it is anywhere within the zone is located, which is traversed by the rays. By suitable seat of the Ray detectors can detect this deflection wherever it occurs in the zone, so cause at least one beam detector to stop receiving a beam. In certain pelts, a reduction in the current can be all that occurs on the beam detector is required.

The beam detector can be of any suitable shape to an output signal (e.g. a fluid pressure signal) according to the flow or to generate the pressure of the fluid jet emanating from the fluid. Through a suitable connection of the outputs of the radiation detectorsj e.g. via a pure Fluidic-8system, can then change the number of jets which the Fluidic reach, be determined. Such a logical system can be designed in this way that it shows which beam detector .tor was affected, and the resulting Information can be interpreted in terms of the position of the body within the zone will. Any known suitable form of the logical system can be used.

In certain cases, e.g. when the body is exactly on the center line of the beam, the beam is blocked, i.e. dispersed, and not into one Deflected path.

The body can be stationary or move in any direction relative move to the rays.

According to a preferred embodiment of the invention, the Apparatus jet curtain generating means comprising a fluid curtain direct in such a way that it encircles the ray or rays within a Includes zone which is at least partially defined by the curtain.

The detector zone can resist draft or contamination from undesired solid or liquid particles. be protected by having any or all Sides of the zone are enclosed by such fluid curtains.

The device preferably contains such a beam curtain generating device, which directs a curtain of fluid over the ptad of the body, ao that the body must pass through the curtain before reaching the ray or rays can.

Such jet generating means preferably have a fluid outlet on. which is arranged in the housing around an inlet end of the interior to the To straighten the curtain around the inlet end.

The fluid outlet can be from the inlet end of the space through a Surface of the housing to be spaced, which is arranged so that by adhesion of the fluid exiting the outlet on this the fluid from the outlet via the inlet end. This arrangement is advantageous when the body can exert a severe shock on the curtains and if there is damage the fluid outlet can cause.

The priority also helps protect the detector from damage to protect.

The jets can be laminar or turbulent. When the body of If a beam is hit, the latter becomes turbulent if it has not already been is, and it is deflected by turbulent clinging to the body or the jet becomes locked from the body as described above.

The logical system, if provided, can be arranged in this way be that an output from the system indicating the presence of the body in the predetermined Zone is only obtained if more than one beam is deflected or blocked is. Accordingly, any small object that only has a single ray would distracts or blocks, not determined. Separate outputs from the same logical system can be used to create such small objects, if necessary, establish and so between them and the body that passes through the main system to be determined is to distinguish.

According to a further feature of the invention, a bar mill at least one detector according to the invention, which has a passage channel in the Has housing, which represents the interior, through which one in the rolling mill to rolling rod passes, the passage of this rod through the channel is detected.

According to a further feature of the invention, such a system two detectors in the path of the rod in front of and behind a part of the System are arranged, a first such arrangement having beam detectors, connected to control means which operate in accordance with the fluid signals which indicate the presence of the rod and activate means, to interrupt the forward movement of the rod after a predetermined one Time delay has elapsed. The second of the assemblies is with their beam detector connected to the same control device and the control device is according to Effective fluid inlets, which arise from the second detector and the presence of the rod during this time delay and an actuation of the means to stop the rod from moving forward.

Exemplary embodiments of the invention are described below with reference to the drawing described. In the drawing both: FIG. 1 shows a detector in which. a fluid jet directed towards a receiver »Fig. 2 shows the arrangement according to Fig.l, in which a body causes a deflection of the beam, Fit. 3 a simple one Detector in another embodiment according to the invention, the in Fig.l and the principle illustrated in FIG. 2 is used, FIG. 4 is an end view of a detector In a further embodiment of the invention, FIG. 5 shows a section along the line V-V according to FIG. 4, FIG. 6 shows a section of a modified embodiment of the The arrangement according to Fig. 4 and 5 can be seen and runs along the line VI-VI of Fig. 7, FIG. 7 shows a section along the line VIT-VIl according to FIG. 6, FIG. 8 shows a section according to the line VIII-VIII according to Figure 9, with part of a detector in a modified Embodiment can be seen, Fig. 9 shows a section along the line IX-IX according to 8, 10 and 11 two further modifications, FIG. 12 a schematic representation, which shows a part of a bar rolling mill, in dc-m the sensing arrangement is used according to the invention.

1 and 2 illustrate the principle of beam deflection.

A fluid jet 1 is from a DUF, e 2 after a receiver 3 directed towards. When a body 4 enters the zone defined by ray 1, wi.rd the beam deflected by the receiver 2 by the so-called Coanda effect, whereby the fluid jet 1 becomes turbulent and adheres to the body 4.

In Fig. 3 three nozzles 10 are shown, from which three jets 11,12 and 13 emerge, each of which normally look for a separate recipient 14,15,16 is directed towards. In this embodiment, a body 17 in which defined the rays introduced by the three zones and the distances between them /, this body being hit by the left ray 11. This will this beam 11 is deflected so that it merges with the central beam 12, whereby this is also distracted will. All three rays are now directed towards the right receiver 16 and the other two receivers receive no fluid.

The device shown in Figure 4 and 5 consists of a tube 20 with an aerodynamically designed inlet 21 around which an annular jet curtain nozzle 22 is arranged with a pressurized fluid from a in the tubular body 20 arranged annular chamber 23 is fed. Current underside of the Inlet 21 two parallel main jet nozzles 24, 25 are arranged. These are with the same distance on both sides of the center plane V-V (Fig.4), although they could also be located in any other suitable place and they are arranged to have parallel fluid main jets 26 on fluidic detectors 27 align, which is arranged on the opposite side of the bore of the tube 20 are. The detectors 27 are of a type by which the presence or the absence of the principal ray 26 can be ascertained, i.e. an interaction with a fluid jet 28 emerging from a ring 29 of the detector, and this causes the fluid pressure in the central tube 30 of the detector changes. However, any suitable receivers can be used, which respond to the presence or absence of the principal rays 26 or to a Decrease in the current reaching the recipient.

The tubes 30 are connected to a suitable pure fluidic system (not shown), which provides a resulting output signal depending on the Relationship between the pressures in the pipes 30.

Air or other suitable fluid emerges from the curtain jet nozzle 22 and is due to the Coanda effect around the curved inlet section 21 of the tube 20 deflected so that a profiled curtain -31 over the inlet of the Device is formed. The body to be determined must go through the curtain 31 pass before the main rays 26 react, one or the other of which is interrupted by the body 32, whereby the respective detector 27 can generate a corresponding output signal.

The number and spacing of the main rays 26 depend on the size of the body 32 in relation to the size of the zone. There can be more than two rays in each Transverse plane exist and there know two or more groups of rays in different levels can be provided. In the embodiment according to FIG. 6 and 7, for example, two transverse groups are provided, each of four Nozzles 60 and 61 respectively. The DU nozzles 60 overlap the nozzles 61 and are relative staggered to the latter so that an object has a predetermined size, passing through the detector, certainly at least one of the beams meets that emerge from the nozzles. Several detectors 62, which are shown schematically in Pig. 6 are each facing each other.

Nozzle 60 or 61 in the normal path of the nozzle emerging from this nozzle Beam.

The device shown in Fig. 8 to 11 is similar to the device 4 to 7 in principle, but differs from this in the arrangement the main jet nozzles. As can be seen from FIGS. 8 and 9, in this arrangement the main nozzles 70 radially inwards and at the same distance by part the circumference of the detector tube 20 arranged around, so that main rays are generated are (indicated by the arrows in FIG. 9), which are at the same angular distance from one another lie.

The nozzles 70 are axially staggered to prevent mutual interference To avoid jets and diametrically opposite each nozzle 70 is a detector 71.

In the arrangement shown in FIG a rectangular cross-section and there is a single slot nozzle 5 for jet generation provided the opposite is inclined to the axial direction. This nozzle is located in a wall of the body 74. Opposite the nozzle 75 are not shown Detectors arranged. In Figure 11, a single slot nozzle 76 is provided, the Direction perpendicular to the axial direction.

Various modifications can be made with regard to the jet generating nozzles are taken and also with regard to the detectors interacting with them. A plurality of slits corresponding to the slits 75, 76 in a detector can be provided will.

The detector body of each device according to Fig. 4 to 11 can be cylindrical, square, rectangular, or any other suitable internal cross-section be.

The rays can run parallel to one another as in the exemplary embodiment according to Fig. 4 to 7 or in the arrangement in which several slots of the in Fig. 10 and 11 are arranged parallel to each other, or they can run inclined to one another, as for example in the embodiment according to FIG. 8 and 9.

The detectors according to the invention have a wide range of applications. A typical application is that in an 8-bar rolling mill, as shown schematically in Fig .12 shown. The bar mill shown in Fig. 12 has several pairs of rollers, to roll a long bar 80 down to a small diameter. Just that The last few pairs of rollers are identified by the reference numbers 81 and 82, respectively. The five pairs of rollers 82 are located within a cage 825, as the danger is that the front end of the rod 80, its speed in the order of magnitude of 240 m / min (8000 ft / min) as it leaves the rollers 81, shoots up and consequently does not enter between the rollers of the first pair 82. if If this is the pall, a guillotine 84 is actuated to sever the rod immediately and the rolling mill is shut down as quickly as possible. The bedding device for the guillotine is indicated at 85.

Two pick-up devices 86, 87 are arranged behind the rollers 82, each consisting of a tube that is aligned with the path of the rod 80 and into which water is injected through an inlet 81 under very high pressure.

The tendency of the bar 80 to snap up when the front end is the second picking device 87 approaches is made more difficult by the forces that are exerted between the pickling devices by jets of water that meet each other, after they have left the pickling devices, as indicated by the arrows 89 It is therefore also necessary to operate the guillotine 84, if the rod 80 does not run into the second pickling device 87.

In the arrangement shown in Fig. 12, the guillotine operating stage 85 set into action by a control stage 90, which reacts to signals from three pressure switches 91, 92 and 93 responds.

The pressure switch 91 responds to the output of the first rod detector 94, which lies in the path of movement of the rod 80 directly in front of the roller pairs 82. The switch 92 responds to a second rod detector 95 in the movement path of FIG Rod immediately in front of the pickling device 86 in close proximity to it and switch 99 is responsive to pressure signals from a third rod detector 96 within of the inlet of the second deletion device 87.

The bar detectors 94 and 95 are of some type according to FIG of the invention. In particular, the detectors according to Figure 6 and 7 or 8 and 9 appropriate.

The rod detector 96 can also be of any type as described above. In the embodiment shown in FIG it consists only of a pressure tap in the wall of the pickling device 870 The static pressure in the High speed water jet in the picker is changed considerably when the rod 80 enters and exits the pickling device. This can be felt at the tap. the Device 96 is connected to pressure switch 93 via a pipe 97 and to a Cleaning water source 98. via a constriction 99, which is used to control the cleaning water pressure to change in accordance with the static pressure in the pickling device.

The control stage 90 is arranged such that when a signal is received from the pressure switch 91, which indicates that the rod 80 has entered the detector 94 will cause the guillotine to operate unless a signal from Pressure switch 92 is received within a predetermined time interval that indicates that the bar is safely passing through rollers 82 to bar detector 95 and therefore enters the pickling device 66.

When a signal from the pressure switch 92 is within the predetermined time interval is obtained, the control stage 90 delays the operation of the guillotine until another predetermined time interval has passed. A signal from the pressure switch 93 during this further time delay prevents the control stage from operating the guillotine actuated. In the absence of such a signal, the guillotine is actuated.

The pressure signals from detectors 94, 95 and 96 can also be used for any other purpose for which the moment must be known at which the Rod 60 has reached or passed through a certain position.

Other applications are self-evident. A sensing arrangement according to the invention need not serve one end at a time body passing through and consequently need the means to Generation and sensing of the beams not arranged in a through channel to become.

For example, an arrangement according to the invention, which is suitable as a limit switch, which have the shape shown in Fig.1 and 2, wherein the body 4 is a projecting member that is straight at the limit of its movement interrupts beam 1. If it is desired, the beam against the effects from train or the like. shield (especially if the jet is gaseous, but even if it is liquid), this would preferably be done in this case by using reached by shields that are only open on one side or one end and allow the entry and exit of the body 4.

Patent claims:

Claims (19)

P a t e n t a n s p r ü c h e: 1. Feeler device for detection the presence of a body, indicated by the beam generating means (2, Fig.1; 10, Fig.3; 24, Fig.5; 60,61 Fig.7; Fig.8; 75, Fig.10; 76, Fig.11) a Direct the fluid jet at a predetermined point so that a body (4, Fig.2; 17, Fig.3; 32, Fig.5) that touches the beam, this beam (1, Fig.2; 26, Fig.5) or deflects into a deflection path in which the beam aur the Body adheres and that beam detectors (3, Fig.1; 14 to 16, Fig.3; 27, Fig.5; 62, Figure 6; 71, Fig.8) are aligned on at least one of these paths in order that Determine the presence or absence of the beam. 2. Feeling device according to claim 1, characterized in that it is e k e n n z e i c h n e t that a housing (20, Fig. 4 to 9S 74, Fig. 10 to 11) with an interior is provided for receiving this body and that the beam generating means (24; 60.61; 70; etc.) direct the fluid so that the predetermined path sioh extends over this space. 3. Feeling device according to claim 2, characterized in that it is e k e n n z e i c h n e t that the space is a passage in the housing. 4. Feeling device according to claim 3, characterized in that it is e k e n n z e i c h n e t that the channel is substantially cylindrical. 5. Feeling device according to claim 3, characterized in that it is k e n n sO h i c h n t t that the housing is tubular. 6 .. sensing device according to claims 1 to 5, g e k e n n z e i c h n e t by a plurality of beam generating means (10; 24; etc.). 7. A sensing device according to claim 6, characterized in that it is e k e n n z e i c h n e t that at least some of the beam generating means (24; 60,61) are parallel to one another are arranged for the purpose of generating parallel beams. 8. Fühlvörrichtung according to claim 6, characterized g e k e n n z e i c h n e t that at least some of the beam generating means (70) are relative to one another is inclined to generate non-parallel beam len. 9. Fühlvörrichtung according to claims 2 and 7, thereby g e k e n It is indicated that the jet generating means (60,61) are arranged in at least two rows are arranged, which extend over the room and that they are in it coaxially Abatand to each other and staggered in the transverse direction to each other, so that a body (52) entering the space affects at least one beam, when it comes into the zone of the room in the vicinity of the beam generating means. 10. Feeler device according to claims 4 and 8, thereby g e k e n n z e i c h n e t that the jet generating means (70) are arranged radially in the channel are. 11. Fühlvorrichtzung according to claims 6 to 10, thereby g e k e n n z e 1 c h n e t that a plurality of beam detectors (14 to 16; 27; 62; 71) is provided. 12. Sensing device according to claim 11, thereby g e k e n n n z e i c h n e t that the beam detectors (14,16; 27; 62; 71) opposite each beam generator (10; 24; 60,61; 70) are arranged in such a way that they have a beam along them of the predetermined path is supplied. 13. Feeling device according to one of the preceding claims, characterized It is not noted that the jet generating means has the shape of a slot (75; 76), whereby a substantially flat fan beam is generated. 14. Feeling device according to one of the preceding claims, characterized it is not noted that the beam curtain generating means (21-23? Fig. 4 to 7) are provided through which a fluid curtain (31) is directed so that that the beam or beams (26) are confined within an enclosed zone which is at least partially defined by the curtain, 15. Feeler according to claim 14, characterized in that a beam curtain generating device (21-23) a fluid curtain (31) over the path of the body to be detected in such a way that this body must pass through the curtain before it reaches the beam or beams (26). 16. Feeling device according to claims 2 to 5 and 15, characterized in that g It is noted that the jet curtain generator has a fluid outlet (22) arranged in the housing (20) around an inlet end of the interior space is to direct the curtain (31) around the inlet end. 17. Feeling device according to claim 16, characterized in that it is e k e n n z e i c that is, the fluid outlet (22) from the inlet end of the space through a Surface (21) of the housing (20) is spaced, which is arranged such that by adhering the fluid to this fluid (31) from the outlet is passed over the inlet end. 18. Fühivorrichtung according to any one of claims 1 to 17, characterized g e it is not noted that at least one detector (94, 95, FIG. 12) is used for detection a rod (80) passing through a rolling mill. 19. Feeling device according to claim 18, characterized in that it is e it means that the two detectors (94 and 95) are in the path of movement of the rod (see above) or behind the rollers (82) are arranged, wherein the first detector (94) to a Control device (91, 90, 85) is connected, according to fluid signals is actuated by this and indicates the presence of the rod and the actuation a guillotine (84) for separating the rod in operation after a predetermined time delay has elapsed and that the second detector (95) is on the same control device is connected such that according to fluid signals from the second sensing device, which detects the presence of the rod during the time delay indicate that actuation of the guillotine is prevented.