CN116417307A

CN116417307A - Filament calibrating device for cathode assembly of X-ray tube

Info

Publication number: CN116417307A
Application number: CN202310386108.8A
Authority: CN
Inventors: 杜小琴; 黄靖; 焦婷婷
Original assignee: Kunshan Yiyuan Medical Technology Co ltd
Current assignee: Kunshan Yiyuan Medical Technology Co ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-07-11

Abstract

The invention discloses a device for calibrating a cathode assembly filament of an X-ray bulb tube, which comprises a bedplate, a support frame, a calibration mirror and a positioning angle code, wherein a first calibration line is arranged on the upper side of the bedplate along the horizontal central line of the bedplate; the support frame is vertically arranged on the upper side of the bedplate and used for supporting the cathode bottom plate, and a projection line of the horizontal center line of the support frame on the upper side of the bedplate coincides with the first calibration line; the calibrating mirror is also vertically arranged on the upper side of the platen and is opposite to the supporting frame, a second calibrating line which is vertically arranged is arranged on the calibrating mirror, and projection lines of the second calibrating line on the upper side of the platen are also coincident with the first calibrating line, namely the first calibrating line and the second calibrating line are matched to calibrate the filament; the positioning angle code can position the cathode bottom plate and the supporting frame on the supporting frame along the same central line. The calibrating device is simple in structure and convenient to operate, not only can improve the assembly efficiency, the assembly precision and the yield, but also can effectively protect the lamp filament, reduce the assembly precision requirement on the previous working procedure and improve the assembly yield of the subsequent working procedure.

Description

Filament calibrating device for cathode assembly of X-ray tube

Technical Field

The invention relates to the technical field of cathode assembly of X-ray tube, in particular to a filament calibration device for cathode assembly of an X-ray tube.

Background

The X-ray tube comprises a cathode and an anode, wherein a filament of the cathode generates electrons and bombards an anode target material under the action of an electric field to generate bremsstrahlung, so that X-rays are generated. As the filament of the electron emission source of the X-ray tube, the installation position of the filament in the X-ray tube can directly influence the convergence of electron beams and the size and shape of a focus, the size and shape of the focus are closely related to the image, the image is unclear due to the overlarge focus, and the X-ray tube is invalid due to the fact that the anode target disc material is easily melted due to the overlarge focus. The installation position of the filament in the X-ray tube is one of the key factors affecting the focus calibration and image quality of the X-ray tube on the CT scanner.

In the manufacturing process of the tube core of the X-ray tube, as shown in fig. 1, a filament 11 is firstly assembled on a cathode part assembly 10, the position of the filament 11 relative to the cathode part assembly 10 is adjusted, and then the cathode part assembly 10 is mounted and welded on a cathode bottom plate 12 to form a cathode assembly; and finally, welding the cathode assembly and the X-ray shell window 13 assembly to form the X-ray ball tube core. In the process of welding the cathode assembly 10 to the cathode base plate 12, it is necessary to ensure that the filament 11 is aligned with the center line of the cathode base plate 12 so as to ensure that the filament is properly positioned in the X-ray tube 1.

In the ideal case of the above-mentioned X-ray tube 1 assembly, i.e. when the line in which the filament 11 is located coincides with the center line of the cathode base plate 12 (see fig. 2), the rectangular electron beam impinges on the surface of the target disc to form a rectangle, and the obtained effective focal plane will also form a rectangle. And X-rays emitted by the X-ray tube 1 received by the detector 3 on the CT whole machine are shown in figure 3, and the X-ray range just covers the detector 3.

However, in the actual production and assembly process, the line where the filament 11 is located is not coincident with the center line of the cathode bottom plate 12 due to the limitation of the assembly precision (see fig. 4), at this time, the rectangular electron beam bombards on the surface of the target plate to form a parallelogram, and correspondingly, the obtained effective focal plane also forms a parallelogram. However, in calculating the focal size, the focal size is usually obtained by measuring the distance between the two points farthest in the width direction of the focal image and the distance between the two points farthest in the length direction, and multiplying the two points. However, since the focal image is in a parallelogram shape, the width dimension is elongated, which inevitably results in a focal dimension that does not meet the design requirements. When the filament position is shifted, the X-ray range received by the detector 3 will also change, as shown in fig. 5, and when the X-ray range cannot cover the detector 3, the X-ray tube 1 will not pass through the calibration on the CT whole machine.

The filament deflection is mostly caused by analysis of bad products, and the current cathode assembly process is as follows: referring to fig. 6, the cathode bottom plate 12 is first placed on the positioning fixture 4, then the cathode assembly 10 is inserted into the matching hole on the cathode bottom plate 12, meanwhile, two positioning pins on the positioning fixture 4 need to be inserted into two positioning holes on the cathode assembly 10 until the cathode assembly 10 is completely in place, and finally argon arc welding is performed at the matching position of the cathode assembly 10 and the cathode bottom plate 12, so as to finish the sealing of the cathode assembly 10 and the cathode bottom plate 12.

However, the cathode assembly has the following defects: 1) In the whole assembly process, operators cannot observe the position of the filament, and the operators need to pay caution in the assembly process, otherwise accidents that the filament is broken or deformed due to the fact that the positioning pin is inserted into the filament easily occur, so that the whole cathode part is scrapped to cause great loss; 2) If the conditions of clamp abrasion, unqualified matching size of parts, misoperation and the like occur, the position of the filament is deviated, but operators cannot judge whether the filament is positioned at the correct assembly position, only after cathode welding is finished and even after product focus testing is finished, a large amount of reworking and waste are caused; 3) The positioning fixture and the positioning part and the parts are required to be tightly matched, so that the filament just positioned on the central line of the bottom plate after assembly can be ensured, the dimensional accuracy of the matched parts and the fixtures is required to be high, and the manufacturing cost of the product is increased.

In view of this, the present invention has been made.

Disclosure of Invention

In order to overcome the defects, the invention provides the calibration device for the cathode assembly filament of the X-ray tube, which has the advantages of simple structure and simple and convenient operation, not only can improve the assembly efficiency, the assembly precision and the assembly yield, but also can effectively protect the filament, reduce the assembly precision requirement on the previous process and improve the assembly yield of the subsequent process.

The technical scheme adopted by the invention for solving the technical problems is as follows: the calibration device comprises a platen, a support frame, a calibration mirror and a positioning angle code, wherein the platen is horizontally arranged, and a first calibration line is arranged on the upper side of the platen along the horizontal center line of the platen; the support frame is vertically arranged on the upper side of the bedplate and used for supporting the cathode bottom plate, and a projection line of the horizontal central line of the support frame on the upper side of the bedplate coincides with the first calibration line; the calibrating mirror is also vertically arranged on the upper side of the bedplate and is oppositely arranged with the supporting frame, a second calibrating line vertically arranged is arranged on the calibrating mirror, and the projection line of the second calibrating line on the upper side of the bedplate is also coincident with the first calibrating line, namely: the second calibration line is matched with the first calibration line together to calibrate the coincidence ratio between the straight line of the filament and the central line of the cathode bottom plate; the positioning angle code can position the cathode bottom plate and the supporting frame on the supporting frame in a concentric line.

As a further improvement of the present invention, the supporting frame has a base portion, the base portion is of a plate-like structure with a regular shape, the base portion is erected and fixedly arranged on the upper side of the platen, and a horizontal center line of the base portion is a horizontal center line of the supporting frame;

in addition, the base body part is downwards sunken from the top side of the base body part to form a supporting groove matched with the shape of the cathode bottom plate, a supporting step is formed on the base body part and positioned at the periphery of the supporting groove, and the supporting step and the supporting groove are matched together to support and limit the cathode bottom plate;

in addition, the base body part is also recessed upwards from the bottom side to form a slot for being matched with the positioning angle code in an inserting way.

As a further improvement of the invention, the supporting type groove is divided into three sections, namely a first supporting section, a second supporting section and a third supporting section, wherein the first supporting section and the second supporting section are arc-shaped and are arranged in mirror symmetry relative to the horizontal center line of the base body part; the third support section is U-shaped and is positioned between the bottom ends of the first support section and the second support section, and the top ends of the two side walls of the third support section are respectively connected with the bottom ends of the first support section and the second support section;

in addition, the support steps are respectively formed beside the opposite outer sides of the first support section and the second support section, and the two support steps are also arranged in mirror symmetry relative to the horizontal center line of the base body part.

As a further development of the invention, the slot is of inverted U-shape, the projection line of the horizontal center line of the slot on the upper side of the platen also falling on the first alignment line.

As a further improvement of the invention, the calibration mirror is a plane mirror with regular shape, the calibration mirror is inclined and fixedly arranged on the upper side of the bedplate, and meanwhile, the calibration mirror and the base body part are opposite to each other along the extending direction of the first calibration line and are distributed at intervals; in addition, the central line on the calibration mirror and extending along the inclined direction is the second calibration line.

As a further development of the invention, the inclination angle of the calibration mirror relative to the upper side of the platen is 30-60 °, and correspondingly the angle at which the second calibration line intersects the first calibration line is also 30-60 °.

As a further development of the invention, the angle at which the second calibration line intersects the first calibration line is 45 °.

As a further improvement of the invention, the bedplate is of a rectangular plate body structure, and the center line of the broadside on the upper side of the bedplate is the first calibration line; the calibration mirror is a rectangular plane mirror, and the broadside center line of the calibration mirror is the second calibration line.

As a further improvement of the invention, the positioning angle code is provided with a plug-in part and a connecting part, the plug-in part is an L-shaped structure body formed by connecting a transverse section A and a vertical section A, the connecting part is an inverted L-shaped structure body formed by connecting a transverse section B and a vertical section B, one end of the transverse section B, which is away from the vertical section B, is fixedly connected with the top end of the vertical section A, and one side of the vertical section B, which is away from the transverse section B, is provided with a clamping point;

the transverse section A can be tightly inserted into the slot, and the transverse section B and the vertical section B can be matched and inserted into the third supporting section, so that the clamping point can be clamped with the positioning groove on the cathode bottom plate.

As a further improvement of the invention, the plug-in connection is integrally formed with the connection; and an avoidance inclined plane which is used for avoiding the cathode bottom plate is formed on the upper part of the vertical section A.

As a further improvement of the invention, the calibration device further comprises a light emitting element capable of emitting light spots, wherein the light emitting element is positioned and arranged beside one side of the calibration mirror, which is opposite to the support frame, and the light spots emitted by the light emitting element can fall on the second calibration line and can irradiate the filament.

As a further improvement of the present invention, the light emitting member employs a laser pen.

The beneficial effects of the invention are as follows: (1) by means of the calibration device, an operator only needs to observe the relative position relation between the filament image projected by the filament on the calibration mirror and the second calibration line of the calibration mirror to rotate the cathode assembly until the filament image coincides with the second calibration line of the calibration mirror, so that the line where the filament is located coincides with the vertical central line of the cathode bottom plate, and the position of the filament relative to the cathode bottom plate after assembly is ensured to be accurate. The operation is simple and convenient, and the assembly efficiency is high; and the assembly accuracy is high, and the assembly yield is improved. (2) In the process of assembling the cathode of the X-ray tube by using the calibrating device, on one hand, the lamp filament is not close to any object, and the whole assembling process is visible, so that the risk of breaking or deforming the lamp filament can be effectively avoided, the assembling yield is further improved, and the production waste is reduced; on the other hand, the assembly position of the filament can be adjusted and confirmed in the assembly process, so that the problem that the filament deviates from the center line of the cathode bottom plate due to various reasons is solved, the stability of the focus quality of the X-ray tube is further improved, the assembly position of the filament on each cathode assembly flowing into the subsequent process is ensured to be correct, and a large amount of reworking and waste caused by the cathode assembly problem are avoided. (3) The calibration device of the invention can also reduce the assembly precision requirement of the previous working procedure, namely: the position accuracy requirement of the filament installed in the cathode part assembly is reduced in the previous working procedure; because the position of the filament in the cathode part assembly in the previous working procedure is offset, the calibration device can be accurately adjusted, thereby reducing the assembly difficulty of the X-ray tube.

Drawings

FIG. 1 is a schematic cross-sectional view of an X-ray tube core;

FIG. 2 is a schematic diagram of the positional relationship between the filament and the cathode base plate centerline in the case of an acceptable X-ray tube core assembly;

FIG. 3 is a schematic view of the optical path of X-rays (emitted by the filament) received by the detector in the case of an acceptable assembly of the tube core of the X-ray tube;

FIG. 4 is a schematic diagram of the positional relationship between the filament and the cathode base plate centerline in the case of a failed tube core assembly of an X-ray tube;

FIG. 5 is a schematic view of the optical path of X-rays (emitted by the filament) received by the detector in the event of a defective assembly of the tube core of the X-ray tube;

FIG. 6 is a schematic cross-sectional view of an assembly structure for assembling an X-ray tube core using a positioning jig according to the prior art;

FIG. 7 is a schematic view showing an exploded structure of the calibration device according to the embodiment 1 of the present invention at a first viewing angle;

FIG. 8 is a schematic diagram showing an exploded structure of the calibration device according to embodiment 1 of the present invention at a second view angle;

FIG. 9 is an exploded view of the calibration device according to embodiment 1 of the present invention at a third viewing angle;

fig. 10 is a schematic structural view of a supporting frame according to embodiment 1 of the present invention;

fig. 11 is a schematic structural diagram of a positioning angle code according to embodiment 1 of the present invention at a first view angle;

fig. 12 is a schematic structural diagram of the positioning angle code according to embodiment 1 of the present invention at a second view angle;

FIG. 13 is a schematic diagram showing an operation state of the calibration device according to the embodiment 1 of the present invention when calibrating the tube core of the X-ray tube;

FIG. 14 is a second schematic diagram of the calibration apparatus according to embodiment 1 of the present invention when calibrating the tube core of the X-ray tube;

fig. 15 is an exploded view of the calibration device according to embodiment 2 of the present invention.

The following description is made with reference to the accompanying drawings:

1. an X-ray tube; 10. cathode part assembly; 11. a filament; 12. a cathode base plate; 13. an X-ray housing window; 3. a detector; 4. positioning a clamp; 50. a platen; 51. a support frame; 510. a base portion; 511. a support type groove; 5110. a first support section; 5111. a second support section; 5112. a third support section; 512. a support step; 513. a slot; 52. calibrating the mirror; 53. positioning the angle code; 530. a plug-in part; 5300. a transverse section A; 5301. a vertical section A; 5302. avoidance slope; 531. a connection part; 5310. a transverse section B; 5311. a vertical section B; 5312. a stuck point; 54. a light emitting member.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1:

as is known, as shown in fig. 1, an X-ray tube 1 includes a cathode assembly 10, a filament 11 mounted in the cathode assembly 10, and a cathode base plate 12 connected to one side of the cathode assembly 10. Embodiment 1 provides a calibration device for a cathode assembly filament of an X-ray tube, which is used for calibrating the coincidence ratio between a straight line where the filament 11 is located and the central line of the cathode bottom plate 12. The calibration device is used for calibrating the coincidence degree between the straight line (vertical state) where the filament 11 is located and the vertical center line of the cathode base plate 12, based on the placement state/calibration state of the X-ray tube 1 shown in fig. 1, 13 and 14.

Please refer to fig. 7-9. The calibration device provided in this embodiment 1 includes a platen 50, a support frame 51, a calibration mirror 52, and a positioning angle code 53, where the platen 50 is placed horizontally, and a first calibration line L1 is provided on an upper side of the platen 50 along a horizontal center line thereof; the support frame 51 is vertically arranged on the upper side of the platen 50 and is used for supporting the cathode bottom plate 12, and a projection line of a horizontal center line of the support frame 51 on the upper side of the platen 50 coincides with the first calibration line L1; the calibration mirror 52 is also vertically disposed on the upper side of the platen 50 and is opposite to the supporting frame 51, a second calibration line L2 vertically disposed is disposed on the calibration mirror 52, and a projection line of the second calibration line L2 on the upper side of the platen 50 is also coincident with the first calibration line L1, that is: the second calibration line L2 can cooperate with the first calibration line L1 to calibrate the coincidence ratio between the straight line of the filament 11 and the vertical center line of the cathode bottom plate 12; the positioning bracket 53 is capable of positioning the cathode base plate 12 and the support frame 51 on the support frame 51 at the same center line (horizontal center line).

The specific configuration of the calibration device and the calibration method according to the present embodiment are described in detail below.

In this embodiment 1, the support frame 51 and the calibration mirror 52 may be disposed vertically or obliquely according to the requirements of use. It will be appreciated that in this embodiment 1, the support frame 51 is preferably disposed vertically, and the calibration mirror 52 is preferably disposed obliquely.

Specifically, as shown in fig. 7 to 10, the supporting frame 51 has a base portion 510, the base portion 510 has a plate-like structure with a regular shape, the base portion 510 is vertically and fixedly disposed on the upper side of the platen 50, and a horizontal center line of the base portion 510 is a horizontal center line of the supporting frame 51, that is, a projection line of the horizontal center line of the base portion 510 on the upper side of the platen 50 coincides with the first calibration line L1; in addition, the base body 510 is formed with a supporting groove 511 which is matched with the shape of the cathode bottom plate 12 from the top side thereof in a downward recessed manner, a supporting step 512 is formed on the base body 510 and is positioned at the periphery of the supporting groove 511, and the supporting step 512 is matched with the supporting groove 511 to support and limit the cathode bottom plate 12; in addition, the base portion 510 is also recessed from its bottom side to form a slot 513 for mating with the positioning bracket 53.

The structure of the supporting frame 51 is further described as follows:

the base portion 510 is erected and fixedly provided on the upper side of the platen 50 in such a structure that: two mounting holes a (not limited to the two above-mentioned ones in practical application, and according to the need) are provided on the upper side of the platen 50, and the two mounting holes a are symmetrically distributed with respect to the first calibration line L1; two pins are further provided, and the base portion 510 is mounted to the two mounting holes a, i.e., to the upper side of the platen 50, through the two pins.

The specific principle of realizing that the supporting step 512 cooperates with the supporting groove 511 to support and limit the cathode bottom plate 12 is as follows: referring to fig. 10, the supporting groove 511 is divided into three sections, namely a first supporting section 5110, a second supporting section 5111 and a third supporting section 5112, wherein the first supporting section 5110 and the second supporting section 5111 are arc-shaped and are arranged in mirror symmetry with respect to the horizontal center line of the base portion 510; the third supporting section 5112 is U-shaped and is located between the bottom ends of the first supporting section 5110 and the second supporting section 5111, and the top ends of the two side walls of the third supporting section 5112 are respectively connected with the bottom ends of the first supporting section 5110 and the second supporting section 5111; in addition, the support steps 512 are formed beside the opposite outer sides of the first support section 5110 and the second support section 5111, respectively, and the two support steps 512 are also arranged in mirror symmetry with respect to the horizontal center line of the base portion 510. Thus, when the support frame 51 is used to support the cathode bottom plate 12, the first support section 5110, the second support section 5111 and the two support steps 512 play a main role in that: referring to fig. 13 and 14, the cathode bottom plate 12 is overlapped on the two supporting steps 512 through the notch on the cathode bottom plate, and the first supporting section 5110 and the second supporting section 5111 are abutted on the inner wall of the notch of the cathode bottom plate 12; the first support section 5110, the second support section 5111 and the two support steps 512 cooperate to support the cathode base plate 12 and also to limit/position the cathode base plate 12 in the horizontal direction.

The slot 513 is in an inverted U shape, and a projection line of a horizontal center line of the slot 513 on the upper side of the platen 50 also falls on the first alignment line L1.

In embodiment 1, as shown in fig. 7 to 9, the calibration mirror 52 is a regular-shaped plane mirror, the calibration mirror 52 is inclined and fixedly disposed on the upper side of the platen 50, and the calibration mirror 52 and the base portion 510 are arranged opposite to and at intervals along the extending direction of the first calibration line L1; in addition, a center line extending in the oblique direction on the calibration mirror 52 is the second calibration line L2.

Further preferably, the calibration mirror 52 is mounted in a plurality of ways by tilting and fixing the calibration mirror on the upper side of the platen 50, as follows: a bracket and a plurality of pins are provided, the calibration mirror 52 is coupled to the bracket by screw locking, glue bonding, or snap-fitting, and then the bracket is fixed to the upper side of the platen 50 by the plurality of pins.

It is further preferred that the inclination of the calibration mirror 52 is optimally controlled for the operator to observe the filament position during the assembly process, such as: the inclination angle of the calibration mirror 52 with respect to the upper side of the platen 50 is 30 to 60 °, and correspondingly, the included angle of the intersection of the second calibration line L2 and the first calibration line L1 is 30 to 60 °. Still more preferably, the angle between the second calibration line L2 and the first calibration line L1 is 45 °.

Further preferably, in order to improve the calibration accuracy, the line width of the second calibration line L2 is preferably controlled, which is: the line width of the second calibration line L2 is consistent with the width of the filament 11. Such that when the filament image projected by the filament 11 onto the collimator mirror 52 coincides with the second collimator line L2, no filament image is visible on the collimator mirror 52. Namely: an operator can accurately and quickly judge whether the filament 11 is adjusted to the ideal position by observing whether the filament image is present on the calibration mirror 52.

In the present invention, the calibration mirror 52 is a rectangular plane mirror, and the center line of the wide side of the calibration mirror 52 is the second calibration line L2; the bedplate 50 is of a rectangular plate body structure, and a broadside center line of the upper side of the bedplate 50 is the first calibration line L1.

In this embodiment 1, as shown in fig. 7 to 9 and fig. 11 to 12, the positioning bracket 53 has a plug part 530 and a connection part 531, the plug part 530 is an L-shaped structure formed by connecting a transverse segment a5300 and a vertical segment a5301, the connection part 531 is an inverted L-shaped structure formed by connecting a transverse segment B5310 and a vertical segment B5311, and an end of the transverse segment B5310 facing away from the vertical segment B5311 is fixedly connected with a top end of the vertical segment a5301, and a clamping point 5312 is disposed on a side of the vertical segment B5311 facing away from the transverse segment B5310; the transverse section a5300 may be tightly inserted into the slot 513, and the transverse section B5310 and the vertical section B5311 may be cooperatively inserted into the third support section 5112, so that the clamping point 5312 may be clamped with a positioning slot on the cathode bottom plate 12.

Description: (1) the positioning mode of combination of tight fitting (in particular, slight tight fitting, which does not affect the operator to disengage the positioning angle code 53 from the supporting frame 51) and the clamping point clamping is adopted, so that on one hand, the projection line of the horizontal center line of the cathode bottom plate 12 on the bedplate 50 can be ensured to fall on the first calibration line L1 of the bedplate 50; on the other hand, the positioning angle code 53 can be conveniently operated. (2) Since the center line of the positioning groove on the cathode base plate 12 is vertically overlapped with the center line of the entire cathode base plate 12, it is ensured that the projection line of the horizontal center line of the cathode base plate 12 on the platen 50 falls on the first alignment line L1 of the platen 50 according to the horizontal section a5300 and the insertion groove 513 and the locking point 5312 and the positioning groove on the cathode base plate 12.

Further preferably, the plugging portion 530 is integrally formed with the connection portion 531; and an avoidance slope 5302 avoiding the cathode bottom plate 12 is further formed on the upper part of the vertical section A5301.

According to the calibration device structure of this embodiment 1, the assembling method for assembling the X-ray tube core by using the calibration device is as follows: as shown in figures 13 and 14 of the drawings,

s1: placing the cathode bottom plate 12 of the X-ray tube 1 on the supporting frame 51, namely, supporting and limiting the cathode bottom plate 12 through the supporting groove 511 and the supporting step 512 of the supporting frame 51; then, the transverse section a5300 of the positioning angle code 53 is tightly inserted into the slot 513, and the connecting portion 531 is inserted into the third supporting section 5112, so that the clamping point 5312 can be clamped in the positioning groove on the cathode bottom plate 12, and the cathode bottom plate 12 can be fixed on the supporting frame 51, and meanwhile, a projection line of the horizontal center line of the cathode bottom plate 12 on the bedplate 50 is enabled to fall on the first calibration line L1 of the bedplate 50;

s2: the cathode assembly 10 is assembled at the cathode assembly assembling hole of the cathode base plate 12, and in this assembling process, an operator can rotate the cathode assembly 10 by observing the relative positional relationship between the filament image projected by the filament 11 on the calibration mirror 52 and the second calibration line L2 of the calibration mirror 52 until the filament image coincides with the second calibration line L2 of the calibration mirror 52. At this time, it is achieved that the straight line of the filament 11 coincides with the vertical center line of the cathode base plate 12, and the position of the filament 11 relative to the cathode base plate 12 after assembly is ensured to be accurate.

Description: by providing the first and second calibration lines L1 and L2, a calibration plane, which is a parallelogram plane defined by the first and second calibration lines L1 and L2, can be determined, as shown in fig. 14. When the cathode base plate 12 is fixed on the support frame 51 by using the support frame 51 and the positioning angle code 53, it is achieved that a projection line of a horizontal center line of the cathode base plate 12 on the platen 50 falls on the first calibration line L1, and an image of a vertical center line of the cathode base plate 12 projected on the calibration mirror 52 falls on the second calibration line L2. In this way, the line where the filament 11 is located can be coincident with the vertical center line of the cathode bottom plate 12 only by adjusting the filament image projected by the filament 11 on the calibration mirror 52 to coincide with the second calibration line L2 of the calibration mirror 52.

Example 2:

embodiment 2 also provides a calibration device for a cathode assembly filament of an X-ray tube, and compared with embodiment 1, the main difference of the calibration device provided in embodiment 2 is that: as shown in fig. 15, in embodiment 2, in addition to the platen 50, the support frame 51, the calibration mirror 52 and the positioning angle code 53, the calibration device further includes a light emitting element 54 capable of emitting a light spot, where the light emitting element 54 is positioned at a side of the calibration mirror 52 opposite to the support frame 51, and the light spot emitted by the light emitting element 54 can fall on the second calibration line L2 and can be irradiated onto the filament 11. Namely: the light emitting member 54 can assist the second calibration line L2 to calibrate the position of the filament 11, so as to further improve the assembly accuracy of the filament and the cathode of the X-ray tube.

Further preferably, the illuminating member 54 is a laser pen, and the number of the laser pens is two. The two laser pens are arranged in parallel up and down, and the distance between the two light spots emitted by the two laser pens is consistent with the length (height) of the filament 11.

The positioning structure of the laser pen may be realized by a structure such as a bracket or a cantilever, which is a technical means known to those skilled in the art, and thus is not described in detail herein.

In addition, in the calibration device provided in embodiment 2, the structures of the platen 50, the support frame 51, the calibration mirror 52 and the positioning angle code 53 are the same as those of embodiment 1 except for the light emitting element 54, so that the description thereof will be omitted.

In summary, the calibrating device has simple structure and simple operation, and an operator only needs to observe the relative position relationship between the filament image projected by the filament on the calibrating mirror and the second calibrating line of the calibrating mirror to rotate the cathode part assembly until the filament image coincides with the second calibrating line of the calibrating mirror, so that the line where the filament is located coincides with the vertical central line of the cathode bottom plate, and the position of the filament relative to the cathode bottom plate after assembly is ensured to be accurate; thereby greatly improving the assembly efficiency, the assembly precision and the assembly yield. In addition, by means of the calibrating device, filaments can be effectively protected, the assembly yield is improved, and the production waste is reduced; and the assembly precision requirement on the previous process can be reduced, and the assembly yield of the subsequent process can be improved.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only of a preferred embodiment of the invention, which can be practiced in many other ways than as described herein, so that the invention is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An X-ray tube cathode assembly filament calibration device, the X-ray tube (1) comprising a cathode assembly (10), a filament (11) mounted in the cathode assembly (10), and a cathode base plate (12) connected to one side of the cathode assembly (10), characterized in that: the calibrating device comprises a bedplate (50), a supporting frame (51), a calibrating mirror (52) and a positioning angle code (53), wherein the bedplate (50) is horizontally placed, and a first calibrating line is arranged on the upper side of the bedplate (50) along the horizontal central line of the bedplate; the support frame (51) is vertically arranged on the upper side of the bedplate (50) and is used for supporting the cathode bottom plate (12), and a projection line of a horizontal center line of the support frame (51) on the upper side of the bedplate (50) coincides with the first calibration line; the calibration mirror (52) is also vertically arranged on the upper side of the platen (50) and is simultaneously arranged opposite to the supporting frame (51), a second calibration line vertically arranged is arranged on the calibration mirror (52), and a projection line of the second calibration line on the upper side of the platen (50) is also coincident with the first calibration line, namely: the second calibration line is matched with the first calibration line together to calibrate the coincidence degree between the straight line of the filament (11) and the central line of the cathode bottom plate (12); the positioning angle code (53) can position the cathode bottom plate (12) and the supporting frame (51) on the supporting frame (51) in a concentric manner.

2. The X-ray tube cathode assembly filament calibration apparatus of claim 1, wherein: the support frame (51) is provided with a base body part (510), the base body part (510) is of a plate-shaped structure with a regular shape, the base body part (510) is vertically and fixedly arranged on the upper side of the bedplate (50), and the horizontal center line of the base body part (510) is the horizontal center line of the support frame (51);

in addition, the base body part (510) is downwards sunken from the top side of the base body part to form a supporting groove (511) matched with the shape of the cathode bottom plate (12), a supporting step (512) is further formed on the base body part (510) and positioned at the position of the periphery of the supporting groove (511), and the supporting step (512) is matched with the supporting groove (511) to support and limit the cathode bottom plate (12);

in addition, the base body (510) is also recessed from the bottom side thereof to form a slot (513) for plugging and matching with the positioning angle code (53).

3. The X-ray tube cathode assembly filament calibration apparatus of claim 2, wherein: the supporting type groove (511) is divided into three sections, namely a first supporting section (5110), a second supporting section (5111) and a third supporting section (5112), wherein the first supporting section (5110) and the second supporting section (5111) are arc-shaped and are arranged in mirror symmetry relative to the horizontal center line of the base body part (510); the third supporting section (5112) is U-shaped and is positioned between the bottom ends of the first supporting section (5110) and the second supporting section (5111), and the top ends of two side walls of the third supporting section (5112) are respectively connected with the bottom ends of the first supporting section (5110) and the second supporting section (5111);

in addition, the support steps (512) are respectively formed beside the opposite outer sides of the first support section (5110) and the second support section (5111), and the two support steps (512) are also arranged in mirror symmetry relative to the horizontal center line of the base body part (510).

4. The X-ray tube cathode assembly filament calibration apparatus of claim 3, wherein: the slot (513) is in the shape of an inverted U, and a projection line of a horizontal center line of the slot (513) on the upper side of the platen (50) also falls on the first alignment line.

5. The X-ray tube cathode assembly filament calibration apparatus of claim 2, wherein: the calibration mirror (52) is a plane mirror with a regular shape, the calibration mirror (52) is obliquely and fixedly arranged on the upper side of the bedplate (50), and meanwhile, the calibration mirror (52) and the base body part (510) are opposite to each other along the extending direction of the first calibration line and are distributed at intervals; in addition, a center line extending in the oblique direction of the calibration mirror (52) is the second calibration line.

6. The X-ray tube cathode assembly filament calibration apparatus of claim 5, wherein: the inclination angle of the calibration mirror (52) relative to the upper side of the platen (50) is 30-60 degrees, and correspondingly, the included angle formed by the intersection of the second calibration line and the first calibration line is also 30-60 degrees.

7. The X-ray tube cathode assembly filament calibration apparatus of claim 6, wherein: the included angle between the second calibration line and the first calibration line is 45 degrees.

8. The X-ray tube cathode assembly filament calibration apparatus of claim 5, wherein: the bedplate (50) is of a rectangular plate body structure, and the center line of the broadside on the upper side of the bedplate (50) is the first calibration line; the calibration mirror (52) is a rectangular plane mirror, and the broadside center line of the calibration mirror (52) is the second calibration line.

9. The X-ray tube cathode assembly filament calibration apparatus of claim 4, wherein: the positioning angle code (53) is provided with a plug-in connection part (530) and a connection part (531), the plug-in connection part (530) is an L-shaped structure body formed by connecting a transverse section A (5300) and a vertical section A (5301), the connection part (531) is an inverted L-shaped structure body formed by connecting a transverse section B (5310) and a vertical section B (5311), one end of the transverse section B (5310) facing away from the vertical section B (5311) is fixedly connected with the top end of the vertical section A (5301), and a clamping point (5312) is arranged on one side of the vertical section B (5311) facing away from the transverse section B (5310);

the transverse section A (5300) can be tightly inserted into the slot (513), and the transverse section B (5310) and the vertical section B (5311) can be matched and inserted into the third supporting section (5112), so that the clamping point (5312) can be clamped with the positioning groove on the cathode bottom plate (12).

10. The X-ray tube cathode assembly filament calibration apparatus of claim 9, wherein: the plug-in connection part (530) and the connecting part (531) are integrally formed; and an avoidance inclined plane (5302) for avoiding the cathode bottom plate (12) is further formed on the upper part of the vertical section A (5301).

11. The X-ray tube cathode assembly filament calibration apparatus of claim 1, wherein: the calibration device further comprises a light emitting piece (54) capable of emitting light spots, the light emitting piece (54) is positioned and arranged beside one side, opposite to the supporting frame (51), of the calibration mirror (52), and the light spots emitted by the light emitting piece (54) can fall on the second calibration line and can irradiate the filament (11).

12. The X-ray tube cathode assembly filament calibration apparatus of claim 11, wherein: the luminous element (54) adopts a laser pen.