DE1413498B2

DE1413498B2 - ADJUSTMENT DEVICE FOR AN ROENTGEN APPARATUS WITH A CONTROL TRANSFORMER

Info

Publication number: DE1413498B2
Application number: DE19631413498
Authority: DE
Inventors: Willi Kurt 8520 Erlangen Schwarzer
Original assignee: Fritz Hofmann GmbH für Elektrotech nik, 8000 München
Priority date: 1963-04-13
Filing date: 1963-04-13
Publication date: 1971-09-09
Also published as: DE1413498A1

Description

1 21 2

Es sind Stelltransformatoren bekannt, bei denen Antrieb auf einem Schlitten beweglich geführt ist, die Einstellung der am Transformator abgenomme- der selbst durch einen Antrieb längs der Kontaktnen Spannung mittels eines vorzugsweise als Kohle- bahn verschiebbar ist. Der Stromabnehmer ist als rolle ausgebildeten, längs einer Kontaktbahn, z. B. Wälzrad ausgebildet, das sich beim Verschieben des einer blankgemachten Bahn auf der Windung des 5 Schlittens außer auf der Kontaktbahn auch auf einer Transformators, verstellbaren Stromabnehmers er- federnden Wälzbahn des Schlittens abwälzt, von der folgt. Solche Stelltransformatoren werden auch in aus die Stromabnahme erfolgt. Diese Anordnung hat Röntgenapparaten zur Einstellung der Röntgenröh- den Zweck, eine Stromableitung am Lager des Wälzrenspannung verwendet. Hier besteht in vielen Fäl- rades zu vermeiden und außerdem durch die doppelte len die Aufgabe, bei der Röhrenspannungseinstellung io Abwälzung beim Verschieben des Schlittens dafür den durch die Größe des Röntgenröhrenstromes be- zu sorgen, daß sich das Wälzrad auch wirklich dreht dingten Spannungsabfall zu kompensieren; d.h. der und nicht womöglich auf der Kontaktbahn schleift. Stromabnehmer des Stelltransformators muß einer- Um auf jeden Fall die Drehbewegung des Wälzrades seits in Abhängigkeit von dem Einstellglied für die beim Verschieben des Schlittens sicherzustellen und Röntgenröhrenspannung, andererseits in Abhängig- 15 eine ungewollte Verlagerung des Wälzrades gegen keit von dem Einstellglied für die Röntgenröhren- den Schlitten bei Erschütterungen od. dgl. zu verstromstärke verstellbar sein. hindern, ist ein von dem Antrieb betätigter SeilzugVariable transformers are known in which the drive is movably guided on a slide, the setting of the ones picked up on the transformer itself by a drive along the contacts Tension can be displaced by means of a carbon track, preferably as a carbon track. The pantograph is as role trained, along a contact path, z. B. formed rolling gear, which is when moving the a blanked path on the winding of the 5 carriage not only on the contact path but also on one Transformer, adjustable pantograph rolls the resilient roller path of the slide, from the follows. Such variable transformers are also done in from the current draw. This arrangement has X-ray apparatus for setting the X-ray tubes, the purpose of which is to conduct current at the bearing of the rolling voltage used. Here there is a lot of falsehood to be avoided and, moreover, by doubling it len the task, with the tube voltage setting io shifting when moving the slide for it to ensure through the size of the X-ray tube current that the rolling wheel actually turns to compensate for any voltage drop; i.e. that and not possibly dragging on the contact path. The current collector of the variable transformer must be a on the other hand, depending on the adjusting member for ensuring and when moving the carriage X-ray tube voltage, on the other hand, as a function of an unwanted displacement of the rolling wheel against ability of the adjustment member for the X-ray tube carriage to generate electricity in the event of vibrations or the like be adjustable. prevent is a cable operated by the drive

Durch die deutsche Patentschrift 931 305 ist be- für die Verschiebung des Schlittens mit einem weitereits ein Röntgenapparat bekanntgeworden, bei dem ren Seilzug gekoppelt, der für die gleichzeitige Bewediese Aufgabe dadurch gelöst ist, daß zur Verstel- 20 gung des sich auf der Kontaktbahn und der federnlung des Stromabnehmers ein von der Einstellvor- den Wälzbahn des Schlittens abwälzenden Wälzrades richtung für die Röhrenspannung betätigter Seilzug sorgt. Die bei diesem bekannten, nur mit einem eindient, der über eine an einem schwenkbaren Hebel zigen Antrieb ausgerüsteten, Stelltransformator vorangebrachte Seilrolle geführt ist; der Hebel wird gesehene bewegliche Führung des Stromabnehmers über einen Kurventrieb in Abhängigkeit von der 25 auf dem mittels des Antriebes längs der Kontakt-Einstellvorrichtung für die Röntgenröhrenstrom- bahn verschiebbaren Schlitten hat also einen völlig stärke so geschwenkt, daß der Stromabnehmer um anderen Zweck als die gemäß der Erfindung voreinen solchen Betrag verstellt wird, daß der durch geschlagene Ausbildung der Einstellvorrichtung, bei die Größe des Röhrenstromes bedingte Spannungs- der durch den einen von zwei voneinander unababfall kompensiert wird. Diese bekannte Anordnung 30 hängigen Antrieben der Schlitten zusammen mit dem hat den schwerwiegenden Nachteil, daß die Verstel- Stromabnehmer längs der Kontaktbahn, durch den lung des Sttromabnehmers nicht durch lineare GHe- anderen Antrieb dagegen nur der Stromabnehmer der, sondern über eine Kurve oder ein Differential- (also bei stillstehendem Schlitten) längs der Kontaktgetriebe erfolgt. bahn verstellt wird. Der bekannte StelltransformatorThe German patent specification 931 305 is suitable for the displacement of the slide with a further bit an X-ray machine became known, coupled with the ren cable, which is responsible for the simultaneous evidence The object is achieved in that to adjust the 20 on the contact track and the spring suspension of the current collector is a rolling wheel rolling from the adjustment front of the rolling path of the slide direction for the tube tension is operated cable pull. Which with this well-known, only serves with one, which is advanced via a variable transformer equipped with a swiveling lever Pulley is guided; the lever is seen mobile guidance of the pantograph via a cam drive depending on the 25 on the means of the drive along the contact setting device for the X-ray tube current path displaceable carriage has therefore pivoted a completely strong one so that the current collector is used for a different purpose than that according to the invention such amount is adjusted that the hit by training the adjustment device at the size of the tube current determined by the voltage of the one of two independent of each other is compensated. This known arrangement 30 pending drives the carriage together with the has the serious disadvantage that the adjusting current collector along the contact path through the The current collector is not controlled by a linear GHe other drive, on the other hand, only the pantograph the, but via a curve or a differential (i.e. with the slide at a standstill) along the contact gear he follows. track is adjusted. The well-known variable transformer

Das ist sehr aufwendig; auch läßt sich ein solcher 35 kann daher dem Fachmann auch keine AnregungThis is very time-consuming; Such a 35 can therefore also not provide a suggestion to the person skilled in the art

Antrieb mit dem Stelltransformator nur sehr schwie- in Richtung der Erfindung geben, da sowohl dieDrive with the variable transformer only give very difficult in the direction of the invention, since both the

rig, wenn überhaupt, organisch verbinden. Aufgabe als auch deren Lösung in beiden Fällenrig, if at all, organically connect. Task as well as its solution in both cases

Die Erfindung betrifft ebenfalls eine Einstellvor- grundsätzlich anders sind.The invention also relates to a setting mechanism that is fundamentally different.

richtung für einen Röntgenapparat mit einem Stell- Die Einstellvorrichtung nach der Erfindung kann transformator, bei der zur Einstellung der Röntgen- 40 ferner so ausgebildet sein, daß zur Verschiebung des röhrenspannung ein längs einer Kontaktbahn des Schlittens ein über Seilräder geführter Seilzug, zur Transformators verstellbarer Stromabnehmer vor- Verschiebung des Stromabnehmers in dem Schlitten gesehen ist, der einerseits in Abhängigkeit von einem Bowdenzüge vorgesehen sind, die so angeordnet sind, Einstellglied für die Röntgenröhrenspannung, ande- daß sie den Bewegungen des Schlittens leicht folgen rerseits in Abhängigkeit von einem Einstellglied für 45 können. Zweckmäßig wird die Wicklung des Stelldie Röntgenröhrenstromstärke verstellbar ist, um bei transformators mit unterschiedlichen Kupferquerder Röhrenspannungseinstellung den durch die Größe schnitten so abgestuft, daß bei konstantem Netzdes Röhrenstromes bedingten Spannungsabfall zu widerstand der Netzspannungsabfall, der Spannungskompensieren. Die eingangs geschilderte Aufgabe abfall im Hochspannungstransformator und der läßt sich auf überraschend einfache Art und Weise 50 Spannungsabfall in sonstigen der Röntgenröhre vorunter Vermeidung des bei dem vorbekannten Rönt- geschalteten Lastkreisteilen durch eine nur von der genapparat auftretenden Nachteiles erfindungsgemäß Röhrenstromstärke abhängige Zusatzspannung bei dadurch lösen, daß für die Verstellung des in einem allen einstellbaren Werten der Röntgenröhrenspanlängs der Kontaktbahn verschiebbaren Schlitten be- nung kompensierbar ist. Wie im folgenden noch erweglich geführten Stromabnehmers zwei voneinander 55 läutert wird, kann es in bestimmten Fällen vorteilunabhängige Antriebe vorgesehen sind, von denen haft sein, zwischen den beiden Einstellgliedern eine der eine mit dem Einstellglied für die Röhrenspan- ein- und ausrückbare Kupplung vorzusehen, so daß nung fest gekoppelt ist und die Verschiebung des bei eingerückter Kupplung die Verstellung eines EinSchlittens zusammen mit dem dabei seine Lage in Stellgliedes sowohl die Verschiebung des Schlittens dem Schlitten nicht ändernden Stromabnehmer längs 60 als auch die Verschiebung des Stromabnehmers im der Kontaktbahn bewirkt, während der andere An- Schlitten bewirkt. Eine lösbare Kupplung zwischen trieb mit dem Einstellglied für die Röhrenstromstärke den Einstellmitteln für die Röhrenspannung und den fest gekoppelt ist und die Verschiebung des Strom- Röhrenstrom vorzusehen, ist bei Röntgenapparaten abnehmers längs der Kontaktbahn in dem dabei an sich schon bekannt (deutsche Auslegeschrift seine Lage gegenüber der Kontaktbahn nicht ändern- 65 1 102 917).
den Schlitten bewirkt. Röntgendiagnostikapparate unterscheiden sich inDirection for an X-ray apparatus with an adjusting The adjusting device according to the invention can transformer, in which the setting of the X-ray 40 can also be designed so that to shift the tube voltage, a cable run along a contact path of the carriage via cable wheels, to the transformer adjustable pantograph before displacement of the pantograph is seen in the carriage, which are provided on the one hand as a function of a Bowden cable, which are arranged so as to adjust the X-ray tube voltage, on the other hand, that they can easily follow the movements of the carriage, on the other hand, depending on an adjustment member for 45 . Appropriately, the winding of the X-ray tube current is adjustable in order to compensate for the voltage drop caused by the voltage drop caused by the constant network of the tube current in the case of transformers with different copper cross sections of the tube voltage setting. The above-mentioned problem of the drop in the high-voltage transformer and the voltage drop in the rest of the X-ray tube can be solved in a surprisingly simple manner while avoiding the additional voltage in the previously known X-ray-switched load circuit parts due to a disadvantage that only occurs from the apparatus according to the invention, tube current intensity dependent additional voltage in that can be compensated for the adjustment of the slide, which can be displaced in one of all adjustable values of the X-ray tube span along the contact path. As will be explained in the following pantograph two from each other, independent drives may be provided in certain cases that voltage is firmly coupled and the displacement of a single slide with the clutch engaged causes both the displacement of the slide and the slide does not change the current collector along 60 and the displacement of the current collector in the contact path, while the other causes its position in the actuator On slide causes. A releasable coupling between the drive with the setting member for the tube current intensity and the setting means for the tube voltage and which is firmly coupled and to provide for the shifting of the current tube current is already known per se in X-ray apparatus along the contact path (German interpretation document opposite its position do not change the contact path - 65 1 102 917).
causes the slide. X-ray diagnostic apparatus differ in

Wohl ist schon ein Stelltransformator mit einem der Bedienungsart. Es gibt die Dreiknopfeinstellung.A variable transformer with one of the operating modes is probably already there. There is the three button setting.

Stromabnehmer bekanntgeworden, der durch einen Bei dieser sind die Röhrenspannung (kV), der Roh-Pantograph has become known, which is caused by a

Claims

3 43 4

Renstrom (mA) and the exposure time (sec) or the trained wheel 15 attached. Between the wheels

Milliampere second product (mAs) regardless of 13 and 15 sits the wheel 16, which z. B. electrical

each other within the permissible load which are magnetically coupled by the magnet 17

X-ray tube adjustable. can. After coupling the wheels 13 and 15

The two-button setting only sees an adjustment 5 on the wheel 16 is adjusted when turning the

possibility for the kV and see or mAs before. The kV setting element 3, the mA setting element 4 as well

the X-ray tube supplied power is time and thus the holder 9 with carbon roller 10. In the

pending adjusted. When regulating the kV, the technical design is based on the correct

stung by inevitably opposing rules to respect the sense.

mA held constant. OK for an X-ray machine with three setting buttons

Even in the case of an X-ray apparatus with a falling load, the kV, mA and (Two-button or one-button setting) is forced to set mAs. In the exemplary embodiment that is With the high voltage of the tube current of the setting element for the mAs and the type of overload with set that the maximum permissible power protection for the X-ray tube is not shown. A at the moment of switching on the X-ray tube not exceeded 15 X-ray apparatus with one according to the invention setting device is formed by the operator

The embodiment of the invention described so far with three adjustment knobs on the operating

appropriately designed adjustment device is on art with two adjustment knobs by engaging the

Three-button adjustment tailored. Wheel 16 switched.

According to the already mentioned advantageous further 20 The coupling of the wheel 16 may, as already training the invention, the adjustment device is performed, only in a certain clutch position for an X-ray machine with two-button adjustment, so that the overload protection made suitable in that between the connection for the X-ray tube with the corresponding guide drive for the slide and the drive which is the same in the position setting, otherwise it can A sliding charcoal roller is slidable and the X-ray tube may be overloaded. Reachable Coupling, e.g. via gear wheels, preliminary electrical or mechanical means, is seen. This detachable coupling makes it easy to guarantee that only a single coupling position is possible, an X-ray machine from the operator are not shown as they are self-evident art with three setting buttons (kV, mA and mAs) are open.

an X-ray machine with two adjustment knobs, 30 Such means, which only require a single coupling which only the kV and mAs are set, guarantee the position, are not required if, to switch. When switching, there is only one as it is with the one shown in the drawing Changeover position required, d. H. The lead example is the variable transformer When a certain kV value is reached, a second changeover must be made on one in addition to the carbon roller 10 and mA value. This is attached by corresponding 35 holder 22 has carbon roller 23, which mechanical or electrical blocking means attached to a cam 18 by means of a ensure that is not shown in the figure and via a wheel 20 mounted on the axle 19 are. guided rope 21 according to the movement of the

An embodiment of a cam 18 according to the invention is adjusted. The cam trained adjusting device is shown in the figure 40 18 sits firmly on the axis 12 and therefore moves posed. There 1 denotes the coil and 2 denotes the iron when adjusting the setting member 3 for the tube core of the variable transformer. With 3 the setting voltage is correspondingly.

member for the kV and with 4 the setting member for the If one, as already mentioned, is designated by the operator. When turning the kv-setting member 3 voltage type with three setting knobs on the operation, the slide 5 of the cable 6, which runs over 45 type with two setting knobs or the cable wheels 7 and 8 with falling load, along the spool 1 of the passes in that one moves an electrical changeover variable transformer. At the same time device from the carbon roller 10 to the carbon roller 23 front holder 9 with the carbon roller 10 is adjusted. If it is taken in such a way that the tube voltage is set to this setting element 4 for the tube current (mA), it is no longer necessary to adjust the setting to a different value, then 50 elements for kV and mA are shifted into the above-mentioned holder 9 Coal roller 10 within the shaft to bring the correct clutch position. The transition is at least 5. With a higher tube current, depending on the voltage drop to be expected, one can set the setting elements for kV and higher voltage in any position. In the mA only take place in principle, which means a pleasant simplification for the embodiment shown for the X-ray apparatus between the one serving.
mA adjustment member 4 and the carriage 5 for adjusting the carbon roller 10 Bowden cables 11 are provided. Patent claims:
The Bowden cables 11 are arranged in the apparatus in such a way that

that they move in space when adjusting and!. Setting device for an X-ray machine

can easily follow the movement of the carriage 5. 60 with a variable transformer, in which the setting

Special guide parts are not required. At the development of the X-ray tube voltage a along a

Place the Bowden cables 11 can also be adjusted in the X-ray contact path of the transformer

Genetically engineered cables are used. Pantograph is provided, the one hand in

The extension of the kV adjusting member 3 is dependent on an adjusting member for the

formed by the axis 12, on which the wheel 13 65 X-ray tube voltage, on the other hand in dependence

I is attached, which can be designed as a gear. of an adjusting element for the X-ray

ί The mA setting element 4 sits on the drive shaft and is adjustable in the tube current

114. On this it is e.g. also as a gear tube voltage setting by the size

to compensate for the voltage drop caused by the tube current, characterized in that that for the adjustment of the slide (5) which can be displaced along the contact path guided pantograph (10) two independent drives are provided by which one (6) is firmly coupled to the adjusting member for the tube voltage (3) and the Shifting of the slide together with the not changing its position in the slide Current collector (10) caused along the contact track, while the other drive (11) with the Adjustment member for the tube current strength (4) is firmly coupled and the displacement of the pantograph (10) along the contact path in the slide (5) which does not change its position relative to the contact path.

2. Adjusting device according to claim 1, characterized in that for shifting the Slide (5) a cable (6) guided by cable wheels (7, 8) to move the pantograph (10) in the carriage (5) Bowden cables (11) are provided, which are arranged so that they can easily follow the movements of the slide (5).

3. Adjusting device according to claim 1 or 2, characterized in that between the two Adjusting members (3 and 4) an engageable and disengageable clutch (16,17) is provided so that at engaged clutch the adjustment of an adjusting member (z. B. 3) as well as the displacement of the The carriage (5) and the displacement of the current collector (10) in the carriage.

4. Adjusting device according to claim 1, characterized in that the winding (1) of the Variable transformer with different copper cross-sections is graded so that at constant Line resistance the line voltage drop, the voltage drop in the high voltage transformer and the voltage drop in other load circuit parts connected upstream of the X-ray tube an additional voltage that is only dependent on the tube current strength for all adjustable values of the X-ray tube voltage can be compensated.

1 sheet of drawings