JPS58135555A - Rotary anode of x-ray tube - Google Patents

Abstract

PURPOSE:To obtain a long life by molding a target plate and a stanchion with a heat resisting metal in one body and by inserting a collar-like binder between a stanchion base and a rotor end so as to fix the coupled binding section by brazing. CONSTITUTION:A target plate 1' and a stanchion 2' are molded with molybdenum in one body, and a stanchion base 2a' is screwed into the center of a collar-like binder 9, then this portion is fixed by brazing. Next, the end of a rotor outside cylinder 4' is coupled with the collar-like binder 9, and the coupled section is fixed by brazing. Iron, nickel, molybdenum, or a heat resisting alloy made of them as a principal constituent are used for the material of the collar- like binder 9, and the binder 9 is heated locally by high frequency induction heating or other measures so as to melt the brazing material, thus a temperature rise outside the brazed section can be avoided.

Description

[Detailed description of the invention] According to the present invention, X is used for large-capacity tubes to obtain a long rolling hemorrhoid life.
Regarding the limbal tube rotation positive lIi.

FIG. 1 shows a conventional X-ray tube rotating anode. Electrons emitted from a cathode (not shown) are accelerated by a high voltage between the cathode and anode, become a high-speed electron beam, and strike the target plate IK to emit X-rays. Large capacity tubes require large diameter and thick target plates. Insert the end of the support column 2 into the center hole of the target plate 1 and tighten it with a nut 3 to attach it. The other end of the pillar 2 is
It is cast and integrated into the steel rotor 4. Rotor 4
A coil that generates a rotating magnetic field is placed outside the tube around the
The rotor 4 rotates as an induction motor rotor. Further, the rotor 4 is fastened to a rotating shaft 5 supported by a fixed portion 8 via bearings 7, 7 with a screw 6. However, as the target plate 1 becomes larger and heavier, the part where the target plate 1 is attached to the column 2 with the nut 3 tends to loosen during high-speed rotation during use. Although the balance was maintained, the balance became unbalanced, the rotation noise became louder, and the bearings were damaged. The problem was that it ended up having a short lifespan.

An object of the present invention is to provide a rotary rotor with a long rotation life that allows stable rotation for a long period of time even when a large target plate is used.

In order to achieve the above object, in the present invention, the target plate and the support column are integrally molded from a heat-resistant metal such as molybdenum, so that there is no loosening at the joint between the two, and the support base and the rotor end are connected to each other. A collar-like joint is interposed between the strut bases of this joint.

The fitting joint with the rotor base is soldered and fixed, and the target plate and support column are integrally molded. The outer cylinder has a double structure consisting of an outer cylinder and an inner cylinder that fits into this cylinder, and is rotatably supported via a fixed ik shaft bearing. Cover it and fit it inside.

Place the outer cylinder far from the large-diameter target plate, with the open end facing away from the target plate. I tried to make it stick by touching it.

Figure llm2 is a diagram of one embodiment of the present invention. It is integrally molded with Targera etc. Connect the strut base 2JI to the collar-like joint body 9
Screw it into the center of the hole, and solder this part to secure it in place.

Next, the collar-shaped joint 9K is fitted to the end of the outer cylinder 4 of the rotor, and this fitted part is fixed by brazing. In this case, the material of the brim-like joint 9 is iron, nickel, molybdenum, or a heat-resistant alloy containing these as main components, and the joint 9 is locally heated by high-frequency induction heating or other methods. By melting the filler metal and avoiding temperature rises in areas other than the brazing part, unnecessary heat history of the material is eliminated and problems such as a decrease in material strength can be avoided. It is more durable than a steel rotor top with a strut base cast in it. In this way, if the assembly dimensional accuracy of the structure that integrates the target plate, struts, collar-like joints, and outer cylinder of the rotor is insufficient for high-speed rotation use, the required dimensional accuracy can be achieved by cutting after fixing the assembly. Finish processing. In such an integrated structure, as in the example shown in FIG. 1, it is impossible to screw the w4 portion of the rotor 4 onto the top of the rotating shaft 5 because the target plate 1' becomes an obstacle.

Therefore, as mentioned above, in the present invention.

It has a double structure consisting of an outer rotor cylinder and an inner cylinder.

In this embodiment, as shown in FIG. The outer cylinders 4' of the integrated structure consisting of the outer cylinders of the target plate are integrally supported, and both cylinders are fixed by Sat at a suitable end welding part 11 from the target plate. The beam/gut plate l does not get in the way of this work.

FIG. 3 shows another embodiment of the invention. In this embodiment, the inner cylinder lO of the rotor is rotatably attached to a fixed shaft 8m via a bearing 7,7'.

That is, in the embodiment shown in the second percent, the outer ring of the bearing is fixed and the inner ring rotates, whereas in this embodiment the inner ring is fixed and the outer ring rotates. Also, due to the difference in structure, a nut 12 is tightened on the end of the fixed shaft 8a to fix it to the fixed shaft, which is the inner ring of the bearing, while an inner ring 10'', which is the outer ring of the bearing 7, is located at the upper end of the fixed shaft 8a'. The axial position of the inner cylinder 10' is determined by gripping the inner cylinder 10' with a set screw 6. Other points are similar to the embodiment shown in FIG.

As explained above, according to the present invention, the joint part between the target plate and the column, which was easily caused by loss of balance in the conventional structure and a shortened life per rotation, has been improved by adopting an integral molding method. Since various defects are not caused and the assembly work can be easily performed without being affected by the integrated structure, a rotating anode X-ray tube with a large capacity and a long life can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a conventional X-ray tube rotating anode, and FIGS. 2 and 3 are side sectional views of different embodiments of the present invention. 1/, 2/... integrally molded target plate and strut, 4'... outer cylinder of rotor, 7.7'... bearing, 8.8... fixing part, 9... rib-like connection body, 10.
10... Inner cylinder of the rotor, 11... Welded portions of the inner and outer cylinder ends of the rotor.

Claims (1)

[Claims] An X-ray tube rotation system consists of a target plate that is centered on an electron beam and emits X-rays, a column that supports the plate, and a rotor that rotates the target plate via the column.
The target plate and the strut are integrally molded from heat-resistant metal, and the periphery of the collar-shaped joint that fits into the center hole of the strut base is fitted to the outer cylindrical end of the rotor that generates rotational force, and the The inner fitting joint part of the combined body is brazed and fixed to be integrated, and the outer cylinder of the integrated structure is fitted and supported by the inner cylinder of a rotor rotatably supported by the fixed part via a bearing. , an Xm tube rotating anode characterized in that both of these cylinders are fixed with #* at the end farthest from the target plate.