DE2007444A1 - Engine control - Google Patents

Description

Pr. 0. Dittmann KL Schiff Dr. A. ν. Füner Dipl. Ing.P. Streh)

- .... Patontanwäita

8 Munich 90, Mariahilfplatz 2 & 3, phone 45 40 40

Automation Industries, Ine ° j g

Los Angeles, California, U.S ", A"

Our mark DA-K552 KLS / PS / hö

'' Motor control (priority? 19 _e February 1969, UoS.Ao, No. ₀ 800 869)

The invention relates to an electrical control system for controlling synchronous pulses for stepper motors with different transmission ratios and relates in particular to a new and improved electrical control system which is used in ultrasonic test tanks to control the speed of the paper feed and the sub-gear of the scanning system used in it . to control "

In UItr & sound test facilities where workpiece®, especially large® workpieces, on gravel, defects or other © internal imperfections are checked, it is Usually ^ the workpiece in a large® »tank with water or a sonorous Fluidma with good ultrasonic coupling «in> sut & iidtieiw Pabei is an ultrasound 1 examination device * in d @ s eioh an ultraechall ^ transducer is located, räimüah salt Car and a bridge v ^ rbusntden and in a wing

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The coupling agent is immersed in the tank ο The examination device is then scanned back and forth over the workpiece to carry out the examination and test cycle «

In these non-destructive electrical test systems, the examination device comprises a transformer which usually has a piezoelectric crystal "The transformer is used to detect irregularities in the workpiece UIt quickly" to send vibrations into the workpiece immersed in the liquid coupling agent. O An oscillator sends pulses of electrical energy to the examination device, which excite the transducer. When excited, the transducer sends appropriate beams of ultrasonic energy into the workpiece to be tested. The transducer is generally coupled to the workpiece via the liquid coupling agent, and the beam ν -d is reflected back onto the transducer at the front and rear surfaces of the workpiece. There the ultrasonic energy is converted back into electrical energy _t > The electrical energy reflected in this way is then picked up by a receiver and then displayed on the display device, such as an oscilloscope with a cathode ray tube. »The returned energy is usually displayed in the form of spikes on the display device.

If a randomly occurring point is found in a generally regular sequence of repeatedly displayed points, this is usually the result of an irregularity in the workpiece caused by a crack, flaw or the like i the location of the crack or defect in the workpiece, Fti % τ the distance between the regularly repeating spikes is an indication of the workpiece thickness. A change in this distance indicates a disc fluctuation.

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During the tactile process, the examination device is used guided over the workpiece until the end of the workpiece is reached. The examination device is then switched on and felt in the opposite direction. and practicing leading as well as indexing repeatedly faich the entire workpiece to be tested, never the complete test is finished.

A pen and a recording paper are synchronized with the movement of the examination device driven, which makes the pen ajf the paper visual recording voriffart »

With the devices according to the state of the art technology, if a large workpiece is closed. check was that the image recorded on the paper was normally reduced in a beetinaton ratio by means of a mechanical translation, which consisted of an arrangement of gears, rollers and clutches, does to reduce the size of the recorded image. This was especially true when very long workpieces were to be tested, whereby it turned out that a single tactile movement of the transducer in the direction of the longitudinal axis of the work piece is easier to carry out than many repeated tactile movements along the short axis of the, Werket Uclce o.

This mechanically driven over-the-counter in the prior art have proven to be impractical, since "expensive and complicated" mechanical equipment is required to achieve precise image reproduction is. This elaborate equipment is not <* «r quite expensive but also requires a lot of space. To solve these problems, electrical systems have also been proposed, the Senromeoha, which is normally fed back for each axis

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mechanisms required and synchronized had · This electrical Servosysteue have _o also proved to be quite expensive, too rtickführungsloae Digital Systems sum to "drive are elektromechaniache Übersetzungegetriebe be" Ride been considered. These systems required a separate gearbox for each gear ratio These known systems have again proven to be both extensive and expensive, especially when multiple gear ratios are required

Briefly, the present invention deals with a non-destructive examination "system for workpiece testing". A container or tank with a liquid coupling agent is provided in which the workpiece to be tested is immersed. An examination device with a transducer is also immersed in the liquid coupling agent, which scans the workpiece for defects, pillows or other irregularities or measures the workpiece thickness. The examination device transmits relevant information to the test instrument, where the information is recorded by a pen on a medium which is switched on with each scanning step. During the scanning process, a motor drives the examination device and another motor drives the pen across the paper or other medium in question. In addition, a device in the form of a digital circuit is provided in order to reduce the step size of the image steps executed by the pen in proportion to the actual step size of the sub- book .

A! Ferteaeu of the invention eliminates the need for an electromechanical transmission for the paper * vor8e ::: "±, as was the case with the devices according to the state of the art, and thereby lowers the costs for the over-jet sungetmhsltni β considerable.

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Another feature of the present invention is; that the Briioken drive and the pen * drive take place synchronously from a main »speed generator o Between the speed generator and the pen« drive, a decade divider network with a selector switch is switched on in order to reduce the speed of the pen drive by a certain factor _β

These and other features and advantages of the invention result from the following detailed description of an exemplary embodiment in conjunction with FIG Drawing in the

FIG _o 1 is a representation showing a perspektivisohe erfindunge * gem ss & executed Ultrasohall-inspection tank; and

Fig. 2 is a schematic block diagram for an illustration » realization of the basic idea of the present invention is »

According to FIG. 1, a generally rectangular tank or container 10 is filled with a liquid coupling agent 12, for example water. A workpiece 14 to be tested is immersed in the water coupling means in the tank 10. Sine bridge 13, which spans the tank 10 between its horizontal edges, runs on rails 18 and 20 provided thereon. Around the bridge 16 in the direction of the longitudinal axis To move tanks 10 further at certain times, a corresponding unit is provided for the motor 22. A carriage 24 is mounted on the Brück® 16, and a further unit in the form of a motor 26 and a roller 28, by means of emefis 27, causes the carriage 24 to be occupied over the width of the hori · Spsuxi. the tank 10 · In the in the tank 'befindii * φ'- fl® @ "a2r * K @ pplungeaittel 12 extends one to 38 Φm ~ & m Ifegsm %% saontieft let"te' lower Sude de ©

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a transducer «examination device 38 is attached, which is inserted into the Waseer coupling agent 12 is immersed. In the investigations * - rftt 38 is a known type of device; it usually includes a piezoelectric crystal that is used for ultrasonic testing of workpiece 14

The motor 22 iat via a clutch Sl with a Gear 54 connected, which engages in a mounted on the rail 18 rack 56. Pas gear 54 sits on a shaft 58 which forms part of the bridge 16 and a Wheel 60 on the opposite side of the tank The wheel 60 and the shaft 58 are connected to a frame 62 which supports the roller 28 and the motor 26 and a motor control 64 which controls the speed of the motor 26 controls. After each tactile movement of the carriage 24 over the workpiece 14, the motor 22 receives a pulse and switches the gear 54 on the rack 56 further. This causes the examination device 38 to be indexed along the workpiece 14.

A recorder 42 includes a platen 68, around which a wire-shaped writing pen 70 is helical is wrapped around. The roller 68 also has a roller which is connected directly to the whale via a shaft 76 is. The belt 27 runs around the roller 74, around the orphan 68 and the associated helical pen 70 in synchronism with the rotation of the roller 28 by the motor 26, see below turn.

A paper roll 80 containing a roll of electrically sensitive paper 48 × ^T * i rotation of the Wals · 68 causes the stylus 7Ό, dai "£ on the paper 48 a · straight line corresponding to the probe movement of the examination · -" Are is gerfttet 38 recorded by , since · investigation «·

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if any errors are found «then the results are on the paper 48 by interrupting the straight line Line recorded.

A motor 50 has a roller 84, the About a Gills 86 is connected to a roller 88. The role is 88 coupled to a feed roller 90 driven by the motor 50 is advanced when it receives continuation impulses «, Every time a pulse is applied to the motor SO old the orphan 90 moves the paper 48 one step ter.

Is the scanning process of the examination device working? 38 in the ratio lsi with the tactile movement on the paper 48, the motor 50 is thus acted upon with step pulses of the same size as the motor 22, however, it will Sometimes required, the paper 48 slower than the tactile device 38 continue to move to the ones drawn on paper 48 β Figure exceptionally further when carried out To reduce tactile movements.

\ ); ■■■ In FIG. 2, an oscillator 100 is tilted, which is on

a / Umset ^ s ¹ .102 coupled -is ». wsihai & ®t in turn ® & am, 'fetor 22 gokc ^ pslt is® lacloa the gate 100 XmpuXe ©: am d®n converter MM βϋ & φΜ, _β s @ siel © t this. in turn 'di® © ntrespondende MmMk -w & m Ispmls ^ in © a the motor 22, "um ite sas @ im®n step
"the Xtosüits © !? 102" opens directly
des Wag @ them '24c la the most
«With a-V ^ jfialltKiB lsi works ^ 'k®mn of impulses & m laset zer. 104

ife gate. SO g®fe © ^ p © l, t and this, "fe" eats around ■ the same "Θβ · Schwindi§k © tt w & m with the motor 22 S © ifts @ toa3,4 the 0s« ill @ & 3B ⁷ E (SS) wid a switch 10i let

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Divider 106 switched on, which may be such that it provides output signals in various multiples to switch 108 · The number of YQn to the oscillator to the converter 104 supplied pulses is thus through the decadent part » ler 106 determined via the switch 108. Every output signal of the decade divider 106 thus represents a subdivided multiple of the oscillator output. The switch 108 connects the selected output of the divider 106 with the converter 104, which in turn the motor 50 for the feed roller 90 from · » controls.

As you can see, by appropriately setting the switch 108, a considerable reduction can be achieved for the Generate engine 50. This reduces the advance of the paper 48 in the recorder 42 in proportion to the indexing of the bridge 16. It can be seen that with the same width of the paper 48, a scanning lengthways is extraordinary wide workpieces 14 or lateral scanning over narrow workpieces can be carried out without the need for it would be to move to wide paper recorders.

Expectations

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Claims (1)

DA-K552 Expectations 1 · Non-destructive sub-booking system for Workpiece inspection, g e k e η η ζ e i ch net through a container (10) containing a liquid coupling agent (12) contains and in which the workpiece to be examined (14) immerse yourself; an examination device (38) with a. Converter, which is immersed in the liquid coupling agent in the container and is subjected to an investigation. instead of bringing a connection with the workpiece Information about the workpiece is to be determined by a holding device (16, 24), the two movements of the examination device in two dimensions along certain tactile lines the workpiece mediates; means (22) for indexing the holding means at predetermined intervals; a recording device (42) responsive to the examination device and marked on a movable medium records which represent the information transmitted by the examination device, the recording device using a pen (70) for the markings by * summarizes, which scans the medium (48) in a certain ratio to the scanning movement of the examination device on the workpiece; means (50) for advancing the medium of the recording exercise means; as well as a sub-heating device (106,1Od), which is connected to the device "for port switching of the EsIt" device and the device for switching on the "calibration" is coupled in order to switch responsibly » 0098A2 / T08Q DA-K552 - 10 ο . lceit of the image generated by the recording device compared to the actual switching speed of the To reduce the examination device. 2. System according to claim 1, characterized in that net that the reduction device has an electrical pulse source (100) coupled to the drive (22) of the holding device (16, 24), which feeds the holding device device effected at a speed determined by the frequency of the supplied pulses, as well as a frequency divider (106) connected to the pulse source, which is connected to the Switching device (50) of the recording device (42) is connected to this with a by the frequency of its to advance the supplied pulses at a certain speed, 3. System according to claim 1, characterized net that the device for advancing the holding device (16,24) has a first electric motor (22) and the device for advancing the recording device (42) comprises a second electric motor (50). 4. System according to claim 3, characterized by an electrical pulse source (100); a first electrical converter (102) connected to the pulse source and supplying follow-up pulses to the first electric motor (22); a frequency divider (106) connected to the source and providing output pulses of variable frequencies; 009842/1000 DA-K552 - 11 - and a second electrical converter (104) operating on responds to the output pulses of the divider and supplies the second electric motor (50) with follow-up pulses. of motors, g e k e η η ζ e i c h η e t by ej electrical pulse source (100); a first cfiectric Converter (102), which is caused by the source and the one (22) of the two motors supplies follow-up pulses; a Frequency divider (106) connected to the source and emits output pulses> variable frequencies; as a second electrical converter (104) responsive to the output pulses of the divider and the other (50) of the ν t 6. Non-destructive testing system for testing of workpieces immersed in a container with a liquid coupling agent by a bridge (16) spanning the container (10); a carriage (24) mounted on the bridge with an examination device (38) for the determination of information about the investigation, where the car and the investigation council can feel the workpiece (14); a record means (42) for recording the examination information stations on a medium (48); a first facility (22) to advance the bridge after each signal from the 009842 / iOBO DA-K552 »12 - Examination equipment and the car; second means (SO) for advancing the medium after each signal from the Examination device; as well as an electrical modulation device (102,104,106), which is connected to the two switching devices is coupled to apply them at certain intervals. 7. System according to claim 6, characterized gekennzeich- W net that the modulation means comprises means (106) for varying the Fort switching sequences between the first and second indexing means (22,50). 8th. ; System according to claim 6 or 7, characterized in that the device for changing the Stepping sequences is a frequency divider (106). 9. System according to claim 6, 7 or 8, characterized in that that the two switching devices "are electric motors (22,50). 10. System according to claim 9, characterized in that the control device has an electrical pulse source (100) coupled to the first electric motor (22) " which " continued to see the bridge (16) with a ": by the frequency of the first motor supplied pulses causes a certain speed, as well as a frequency divider (106) which is connected to the pulse source and connected to the two 0098 A 2/1080 DA-K552 - 13 ■ ■ - ' th electric motor (50) is coupled in order to effect a Foxt switching of the medium (48) at a speed determined by the frequency of the pulses supplied to the second electric motor. 11 · System according to claim 1, 2, 4, ^ or 10, characterized by a device C108) for changing the frequency of the pulses emitted by the frequency divider (106),. 009842/1080 Blank page