DE1623663B1 - ELECTRIC LIGHT SENSING DEVICE FOR DIGITAL DISPLAY OF THE RELATIVE POSITION OF A MOVING ELEMENT - Google Patents

Description

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The invention relates to a photoelectric scanning during the loading and transport processes device for digital display of the relative position must be kept such a temperature that the a movable element with one of which sodium remains liquid.

moving element synchronously driven encoding The loading machine and in particular the layered Element that are a plurality of parallel tracks 5 determining device serving scanning device has, each of which has a binary code in the between the upper part of the Reaktorais Bears identification mark, with a solid container and the free surface of the sodium standing light source and a fixed photo-provided, highly "heated inert gas cushion, between which the coded element and a classifies.

The scanning device, which is a relatively simple element with a high relative speed, works more easily in this extreme environment and the individual tracks on the encoded longer and more reliably than those previously used to scan the element in a constant sequence for position determination electrical or magnetic sensors are uniformly offset to one another in the direction of movement and are largely insensitive to changes in the movement speed of the corresponding number of markings due to changes in the number of tracks of the coded element,
■ the lane voters are provided. The invention is illustrated by the following

Such a device is from the German description of an AusPatentschrift cited only as an example 896165 known and enables the leadership form. The description refers to the Scanning "in series", whereby the 20 drawings; shows therein

NEN containing location information of only one Fig. 1 is a very schematic view of a loading detector "Read" and digitally displayed a machine in a nuclear reactor that can be which offers advantages over such a scanning device according to the invention is equipped by devices that scan “parallel” and consequently only those for determining the position of the swing bridge of the need a separate detector for each lane. 25 loading machine serving part in section along the

Since the offset markings of the track selector axis of the swing bridge is shown,

successive without interruption, they must each Fig. 2 and 3 in plan a part of the

always to the binary code markings of the assigned coded disc and the path selector of the scanning

Neten tracks must be exactly centered when the photo device of Fig. 1,

cell each has a consistently strong healing signal 30 FIG. 4 is a schematic section along the

■ should receive and deliver (the dark signal is the axis of the swing bridge of Fig. 1, the one with the

always constant). A consistently strong wagon-related part of the scanning device

The output signal (»bright« or »1«) is for reliable digging shows

tale display required. The constant Zen Fig. 5 schematically shows the device in the

tration of the markings to each other is optics used in 35 Fig. 1,

heavy mechanical loads, e.g. B. by Fig. 6 similar to FIG. 2 in plan a part of the

Vibrations and high thermal stresses of the coded strip of the device of FIG. 4,

not guaranteed. FIG. 7 is similar to FIG. 4, a schematic one

The invention is now based on the object of providing a section along the axis of the swing bridge in FIG

to remedy this disadvantage and a photoelectric 40 with a modified scanning device and

To create scanning device for digital display, FIG. 8 schematically the form and time sequence

"with the reception and the display always during the different impulses.

a period of time where the illumination of the scanning photocell shown as an example in the figures is maximum, so that no errors can occur between device for use with a load of the signals "0" and "1". 45 machine for sodium-cooled nuclear reactors

According to the invention, this object is achieved, as is described in the German patent application “a photoelectric scanning device of the initially P 15 89 610.3. For the purposes of the specified type, which is characterized in that this description, however, only the main inventory and the coded element are specified as also the track selector parts of the loading machine, as far as the club has additional tracks with the same markings on the special training and work • have the scanning device required to trigger the identification pulses,
in precise assignment to the identification mark- The loading machine has a carrier 10, the xings of which are arranged. ...... end section the axis of rotation of a swing bridge 12

The reading is therefore carried out in the event of coincidence, i.e. H. to carry, on which a carriage 14 runs. The carrier 10 is

the time when the signals are clearest. 55 into the container 16 of the nuclear reactor through a feed

Preferably, stepping aisle 18 can be introduced to establish the reference point. The combination of the

the size of the path selector to be displayed over its side of the swing bridge 12 around its axis, which is shown in FIG

A drive coupled with a pulse generator. the operating position of the carrier 10 with the axis of the

Such a facility can be used to collapse the reactor vessel, and the shift tim the controlled displacements of a movable 60 exercises of the carriage 14 on the swing bridge enables element to track or to the displacements borrowed the setting on each one of the focal, ■ of the element according to a predetermined program fabric elements of the core (not shown) of the core automatically to control. - Reaktors appropriate place.

It finds a particularly important application for The photoelectric scanning device according to the invention

Display of the location of the parts of an inside a 65 direction consists of two separate arrangements,

Loading machine located in the nuclear reactor vessel, one of which with the swing bridge 12 together-

Tv acts during reactor operation and with loading machines and the other works together with the carriage 14.

of sodium-cooled nuclear reactors, which also acts and shows its position on the swing bridge.

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In this way, the position of the carriage 14 in the actuator container 16 is arranged photocell 26

Container 16 is defined in terms of polar copinates. The embodiment shown in Fig. 5 consists of the optics

The in Fi g. 1 shown, belonging to the swing bridge 12, made up of ten interacting with lenses 42, total

The device has a light source 20. The reflective prisms 40 which represent the ten of the Opposite this, the coded element is a bundle coming with the 5 elementary sources 44 in the opti-

Swivel bridge non-rotatably connected coded disk 22 see beam path 39 steer.

arranged (Fig. 2). If one assumes that the track selector has openings 23 which rotate in several concentric circles and - for simplicity - the coded tracks are arranged. The openings represent Mar disk 22 in a position immovable, with markings, each in binary code a radial iö which faces a radial beam 24 of the light source, beam under a row at regular angles, the photocell receives ten information intervals of successive radial beams one after the other Identify 24 of the functions (light or dark pulses) according to the T-coded disc. The angular distance from the swing bridge 12 at the time under consideration between two successive radial rays assumed angular position. Since the photocell 26 24 depends on the desired accuracy of the angle 15 is repeatedly actuated in the same way, the angle of the swing bridge 12 is determined. The number required to determine the beginning of the reproduced binary radial rays 24 defines the number to be determined. The determination of this reference number of circular paths, which must be sufficient to point, is done in a simple manner by coupling the all radial rays to be identified in the binary code shaft 32 with a pulse generator 46 ", the ren. With ten successive code paths (in 20 : every time a radial Fig. 2 is labeled I, II ... X) one can identify a maximum beam of the path selector 30, which identifies a radial beam on the circle 1024. Apart from this path I. 36 has, between which the encoded disc carries an additional (eleventh) light source 20 and the photocell 26 passes through.
Railway, the task of which is described below. Because of the rotation of the path selector 30 and the this eleventh path has a slot 25 in the line 25 connected to the rotary bridge coded disc of each radial beam 24. 22, the light intensity fed to the photocell 26

In the embodiment shown, there is a maximum for each healing impulse. The markings from light passage openings 23, each additional (eleventh) circular paths, which the openings, but one can obviously also carry markings 25 and 34, now serve to optimally control the light beam left from different areas in order to be flexible exist, but generate a very clear signal,
Loss of light intensity accepted As stated above, the encoded disc has to be accepted. 22 as many slots 25 in the eleventh circular path

The information and radial rays 24 corresponding to each of the ten tracks are present. The train-

tion is one after the other in the form of light pulses 35 selector or cover has for each opening

a single photocell 26 transmitted. 36 on a radial beam 30 a slot 34. That

For this purpose, between the photocell 26 emitted by the light source 20 and through the and the coded disk 22, a path selector 30 coaxial with the coded corresponding openings 25 or 34 is provided. The disc-shaped path selector 3D is through a beam path 48 to a second photocell 46 any device, in the embodiment shown (FIG. 5). When this photocell 46 is illuminated, nmgsforan through a spur gear 31, and one with ad. h _v when the respective radial beams of the two disks arranged outside the reactor vessel coincide, the photocell 46 triggers a drive motor-coupled shaft 32 with a constant electrical switch 50, whereby the photocell rotates constant speed, which is relative to 45 26 a Informader of the coded element corresponding to a binary number is high. The path currency can be fed to a memory 52. The latter verier 30 also has eleven concentric circular paths, a display device 54 provides for the reception of the impulse received from the Imauf, which is assigned to the pulse generator 46 "of the coded disc,
1, 4 and 7 are shown schematically angular distances from one another, radial 5p level, connected to the carriage 14, the scanning device of the track selector, whose distances from one another are similar Structure like the ones above are the same as those of the radial rays 24 of the coded single disk 22 connected to the rotating bridge 12, are on the one hand a slot 34, which direction.

corresponds to the slots 25 of the coded Seheibe 22, on the carriage 14, which is marked with a not shown

and on the other hand an opening 36 is arranged (Fig. 3). 55 drive or control mechanism is provided to him

At the transition from one to the next radial to be able to move along the swing bridge 12 is beam is also the opening 3.6 from one to the next as a coded element a circular path through reversing rollers 50 displaced so that the openings fastened in the tensioned endless belt 22 '. On the tape Fig. 3 have arrangement shown. When 22 'are several parallel longitudinal tracks, for example the High speed lane selector 30, e.g., 60 eight, and openings 24 'on each lane 300 rpm, rotates, so leave the openings 36 after a representation of the numbers 0 and 1 of the one used other, the ten of "the encoded disk 22 grain binary codes are provided, with the tracks numbers passing through the beam. "Bundle" means different weights. One in the middle of the beam path of one of the light source part of the swing bridge 12 below the coded Ban-20 Light beam sent through an opening 23 is 65 of the 22 'attached light source 20' illuminates one draws. Optics 38 receive the ten bundles from the area perpendicular to the tracks and leads them all in the same optical beam path openings 24 'and thus generates eight light bundles. As 39 to the on the underside of the cover 28 of the Re- in the above case is a from outside the reactor-

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container rotates a shaft 32 'driven track can. Either one after the other or at the same time elector disc 30 'and eme transmission optics 38' follow. Since the Ijeiden operations are planned independently of which all the emitted light bundles take place in one another and in the same way, only that becomes a single one with the axis of rotation of the swing bridge was first described.

passing the coincident beam path. This .5 The rotary bridge is by means of a light beam, not shown, is received by a photocell 26 ', which is located on the underside of the motor, preferably in the direction in which it is arranged up to the reactor vessel 16 and along its axis to the end position, the shorter way back put in motion. The scanning device, electronic system similar to that of the cell 26 then determines the position of the swing bridge and shows the cooperating system. io time intervals T corresponding to the one between two

An additional ninth track with strands 25 'following pulses of the pulse generator 46 "(Fig. 6) - provides in connection with the slots an additional position corresponding to the time interval (Fig. 5), the angles on the track selector disk 30' this swivel bridge in binary code on the Anlichen circular path for reading in the event of coincidence and indicating device S4. From time t ₀ , where an optimal control. 15 pulse is emitted by generator 46 "

The bundle of light passing through the contactors 25 'every time the photocell 46 receives a pulse

48 'rotates with the swing bridge 12. In the bottom of the catch, d. H. with each passage of a slot 34

Lid is a mirror inclined at an angle of 45 ° in front of the photocell and opening of the switch 50, a

56 provided that the bundle on a second photo binary number from the photocell 26 'through the switch

cell 46 'directs. 20 50 -transmitted to memory 52. ' In this way

The device cooperating with the car will _{transmit ten binary numbers:} what is

tion can also repeat the unified cycle shown in FIG. 7 from time t _± , the

have a multiple structure. In this embodiment, the time t _{0 is} separated by the time interval T

the coded tape 22 'is arranged vertically and is, etc;

the track selector disc by a track selector flow 25. If the displayed binary number exceeds the number

mel 30 "replaced by the shaft 32" via an in which corresponds to the desired end position of the

the swing bridge 12 rotatable hollow shaft 58 is driven rotating bridge, causes the with the help of

. • is practiced. Numerator 60 a continuous comparison between

The light intensity of the light source is preferably carried out with the selected number and the number displayed a low comparator 62 that rends from the mains frequency and its 30 stops the drive harmonic Vibrations of different frequency motors of the swing bridge (arrow /), this measure modulated to the photocells of the one of them can also be done by hand once the one with the to agree to the number of the permanent night component independent of the given number, because the view into the reactor vessel is mandatory.

agile enough requires ambient lighting. 35 The achievable accuracy results from a

This measure leads to the additional advantage · Example: If the diameter of the loading area

that the current supplied by the photocells is about 3 m, you need to bring the car with you

AC voltage amplifiers can be amplified. to an accuracy of at least about 10 mm

Preferably, all tracks should be the same, a binary code with ten digits (2 ¹⁰ = 1024) light source should be illuminated, so that the output 40 for the swing bridge and with eight digits (2 ⁸ = 256) for the case of one of the individual light sources 44 to a general car. The scanning device then allows a malfunction and further actuation to differentiate between two positions which, under faulty conditions, are prevented by 9.2 mm on the circumference of the swing bridge and around the loading machine. If such a solution is not possible for the position of the carriage along the rotary, the elementary light sources 44 in row 45 bridge will distinguish. With automatic control switched, so that the failure of a single one must lead to this error nor the inaccuracy to the total failure of the device. In this case, add to the automatic system, which in the case of magnitude can, however, be used to charge and discharge! mm cherishes.

If necessary, under direct visual over- As can be seen, the device described delivers

monitoring by means of a 50 provided in the reactor vessel, a simple solution for determining the position inadmissible

TV set can be continued. more common moving elements. Of the advantages

In the following it will be described how, when the device according to the invention is used, only the scanning device according to the invention is mentioned that only simple and non-fault-prone carriages are brought into any position, parts are used which can have a temperature of. The end position of the carriage is on the one hand 55 to withstand around 200 ° C. By using the numbers for the orientation of the swing bridge 12 and other codes, which only reads "all or nothing" on the other hand through the position of the carriage 14 on it (light or dark), the influence of the swing bridge can be determined and is determined by two of these Possible deposits of sodium vapor on both coordinates reduce the corresponding binary numbers on the optical surfaces. The tax reproduced. Depending on whether the scanning device 60 motors can only provide a permanent position display outside the reactor vessel or an automatic one and are therefore not intended to bring about the conditions prevailing in the reactor (the conditions prevailing in the latter case are shown in FIG. 1) ), these two digits are finally required for the scanning according to the invention or, by means of numeric encoders in the comparator device, only four bundles of light to enter the two gates. Fig. 1 shows the numerator 60 to 65 position of the carriage defining coordinates and the comparator 62, which show with the swing bridge 12.

cooperate. The photoelectric scanning unit according to the invention

The settings of the swing bridge and the carriage direction can also be used to determine the position

Cartesian coordinates or to measure three coordinates.

Claims (2)

Patent claims: 1. Photoelectric scanning device for digital display of the relative position of a moving one Element with a coded element driven synchronously by the movable element, which has a plurality of parallel lanes, each of which is a binary code mark carries as an identification mark, with a fixed light source and a fixed Photocell between which the coded element and one associated with it, opposite the coded element moving at a high relative speed and the individual path NEN on the coded element in a constant order of scanning, evenly offset from one another in the direction of movement, one with the number of lanes of the coded element having the same number of markings Lane selectors are provided, characterized in that both the coded element (22) and the lane selector (30) an additional lane with the same markings (25, 34), which are used to trigger the identification pulses in precise assignment to the identification markings are arranged. 2. Device according to claim 1, characterized in that to determine the reference point of the size to be displayed, the path selector (30) is coupled via its drive to a pulse generator (46 "). 1 sheet of drawings 109 512/205