Assembling device based on circumferential X-ray tube cathode module

Abstract

The invention provides an assembling device based on a cathode module of a circumferential X-ray tube, which is characterized in that the cathode module is positioned in a second positioning module and is positioned in a first positioning module along with the second positioning module, and a support rod in the cathode module is in contact positioning with a first positioning rod; in the welding process of the cathode and the supporting rod, the positioning fixity of the cathode can be guaranteed, after welding is completed, the cathode module is taken down from the first positioning module along with the second positioning module, the pressing plate and the supporting base are taken down in a translation mode in sequence, the translation operation can avoid touch interference on the cathode in the mold opening process, and the welding efficiency is improved. And the flatness of the cathode is ensured. According to the assembling device based on the circumferential X-ray tube cathode module, the touch interference of various operations on the cathode disc surface in the assembling process can be effectively reduced, the flatness of the cathode disc surface is improved, the performance of an X-ray tube is improved, and the imaging quality of an imaging system based on the X-ray tube is improved.

Description

Technical Field

[0001] This invention relates to the field of X-ray tube technology, and in particular to an assembly device based on a circumferential X-ray tube cathode module. Background Technology

[0002] An X-ray tube releases electrons through a thermionic cathode, which are then accelerated by an electric field and bombard the anode, generating X-rays. A focusing electrode is located at the cathode to provide the accelerating electric field and guide the electrons to focus at the anode focal point. In a circumferential X-ray tube, the functional area of ​​the cathode is arranged in a disk shape, with the disk surface facing the anode focal point, so that under the accelerating electric field provided by the focusing electrode, the electrons can be accurately bombarded at the anode focal point.

[0003] In particular, the flatness of the cathode disk is generally difficult to achieve ideal conditions, and the assembled cathode disk has a certain tilt. This tilt will interfere with the distribution of the accelerating electric field, causing the electron focusing point to deviate from the anode focus, which in turn leads to problems such as deviation in the radiation direction of the excited X-rays and reduced uniformity.

[0004] In the existing technology, the cathode and focusing electrode are directly assembled after being positioned by a simple fixture. The flatness of the assembled disk surface is in the range of 250μm~300μm, which is low precision. This results in a large performance deviation of the X-rays emitted by the X-ray tube, which leads to poor imaging quality of the X-ray tube-based imaging system. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an assembly device based on a circumferential X-ray tube cathode module to solve the problem that the low cathode assembly accuracy in the prior art leads to large performance deviations of the X-ray tube and reduces the imaging quality of the X-ray tube-based imaging system.

[0006] This invention provides an assembly device based on a circumferential X-ray tube cathode module. The cathode module includes a focusing electrode and a cathode. A support rod is coaxially mounted in the focusing electrode, the support rod passing through the focusing electrode. The cathode is welded and fixed to the support rod. The assembly device includes: The first positioning module includes a first base and a first positioning rod that is upright and fixed on the first base. The first base is provided with a first positioning groove. The second positioning module includes a second base, a support, and a pressure plate, wherein... The second base is erected in the first positioning groove, and the second base has a second positioning groove opened laterally. The focusing electrode can be fixedly installed in the second positioning groove by screws. When the cathode module is fixedly installed in the second positioning module, the support rod can be positioned against the top of the first positioning rod; The support is a hat-shaped structure and can be installed outside the focusing electrode to form an operating space outside the focusing electrode. One side of the hat-shaped structure is open to form an operating window. The connection area between the support rod and the cathode is located in the operating space and exposed through the operating window. The pressure plate is disposed outside the plate surface of the support. The pressure plate and the support can be fixed to the focusing electrode by screws. A third positioning groove is provided in the clamping space between the support and the pressure plate. The thickness of the clamping area formed by the third positioning groove is less than or equal to the thickness of the cathode disk surface. The support plate surface is also provided with a through hole, which connects to the third positioning groove, and the through hole is straight out from the side of the operation window so that after the cathode module is assembled, the support can be moved and removed along the plate surface of the focusing electrode while maintaining the fixed posture of the cathode.

[0007] Optionally, the third positioning groove is provided on the support, and the pressure plate is provided with a protrusion that can be embedded in the third positioning groove.

[0008] Optionally, the focusing electrode protrudes from the center of one side of the cathode to form a focusing functional body, and the inner sidewall of the pressure plate fits and matches the sidewall of the focusing functional body, with the fitting area spanning less than or equal to 180 degrees.

[0009] Optionally, the side of the first positioning groove away from the first positioning rod is an open structure.

[0010] Optionally, a fourth positioning groove is provided at the top of the first positioning rod, and the fourth positioning groove fits and matches the support rod.

[0011] Optionally, the support is provided with two sets of mounting holes, which are used for screwing the focusing electrode and the pressure plate, respectively.

[0012] Optionally, the cathode module further includes a ceramic ring and a sleeve, the support rod is sleeved in the sleeve, the sleeve is disposed in the ceramic ring, and the ceramic ring is coaxially fixed with the focusing electrode.

[0013] Optionally, it also includes a cathode shaping module for high-temperature shaping before cathode assembly. The cathode shaping module includes a left shaping fixture, a right shaping fixture, and a pressure block. Cathode pin holes are provided on the mold closing surfaces of the left and right shaping fixtures; The mold closing structure of the left and right shaping fixtures is a stepped structure. A shaping groove is provided on the upper step of the stepped structure for positioning the cathode disk. The side of the shaping groove facing the lower step of the stepped structure is an open structure. The pressure block fits and matches the upper step surface.

[0014] Optionally, the cathode shaping module is made of molybdenum, and the corresponding cathode shaping process includes: In the hydrogen atmosphere of the hydrogen furnace, the temperature of the hydrogen furnace is raised from the first temperature to the second temperature according to the first heating time, and then held for the first holding time. After that, the temperature of the hydrogen furnace is raised to the third temperature according to the second heating time, and then held for the second holding time to complete the shaping.

[0015] Optionally, the cathode shaping module is made of stainless steel, and the corresponding cathode shaping process includes: In the vacuum environment of the vacuum furnace, the temperature of the vacuum furnace is raised from a first temperature to a second temperature according to a first heating time, and held at the temperature for a first holding time to remove water vapor; The vacuum furnace temperature is raised to the third temperature according to the second heating time, and the temperature is held for a second holding time. The gas is removed so that the vacuum degree meets the preset vacuum degree conditions. The vacuum furnace temperature is raised to the fourth temperature according to the third heating time, and then held for a third holding time to equalize the temperature inside the vacuum furnace. The vacuum furnace temperature is raised to the fifth temperature according to the fourth heating time, and the shape is completed after the fourth holding time.

[0016] The assembly device for a circumferential X-ray tube cathode module provided by this invention positions a second positioning module within a first positioning module. When the cathode module is positioned within the second positioning module and subsequently within the first positioning module, the support rod in the cathode module contacts and positions itself with the first positioning rod. This avoids the impact of end-effector jitter on the assembly accuracy of the cathode fixed to the support rod. The second positioning module clamps the cathode disk surface using a support and a pressure plate, and positions it onto the focusing electrode using screws. During the welding of the cathode to the support rod, this ensures the cathode's positioning stability. After welding, the cathode module is vertically removed from the first positioning module along with the second positioning module. The pressure plate and support are then moved horizontally to remove the cathode. This horizontal movement avoids interference with the cathode during mold opening, ensuring the cathode's flatness. This assembly device for a circumferential X-ray tube cathode module effectively reduces interference from various operations during assembly, improves the flatness of the cathode disk surface, enhances the performance of the X-ray tube, and improves the imaging quality of the X-ray tube-based imaging system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the assembly device in an embodiment of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the local structure; Figure 3 This is a schematic diagram of an intermediate state of the assembly device in an embodiment of the present invention; Figure 4 This is an exploded view of the assembly device in an embodiment of the present invention; Figure 5 This is a partial structural schematic diagram of the cathode module in an embodiment of the present invention; Figure 6 This is a schematic diagram of the cathode shaping module of the assembly device in an embodiment of the present invention; Figure 7 This is an exploded view of the cathode shaping module of the assembly device in an embodiment of the present invention.

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] To address the problem of low cathode assembly precision in existing technologies, which leads to significant performance deviations in X-ray tubes and reduces the imaging quality of X-ray tube-based imaging systems, this invention provides an assembly device for a circumferential X-ray tube cathode module. The device positions the cathode module within a second positioning module, which in turn positions it within a first positioning module. A support rod within the cathode module contacts and positions the cathode with the first positioning rod. The second positioning module clamps the cathode's disk surface using a support and a pressure plate, and positions it onto the focusing electrode using screws. During the welding of the cathode to the support rod, the cathode's positioning stability is ensured. After welding, the cathode module is removed from the first positioning module along with the second positioning module. The pressure plate and support are then moved and removed sequentially. This translational operation avoids interference with the cathode during mold opening, ensuring the cathode's flatness. Overall, this effectively reduces interference from various operations during assembly on the cathode disk surface, improves the cathode disk surface flatness, and enhances the X-ray tube's performance.

[0023] Specifically, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the cathode module includes a focusing electrode 110 and a cathode 120. A support rod 130 is coaxially mounted in the focusing electrode 110. The support rod 130 passes through the focusing electrode 110 and has a groove at its mating end. The pins of the cathode 120 are arranged in the groove at the end of the support rod 130 so that the cathode 120 can be welded and fixed to the support rod 130.

[0024] In this embodiment, the cathode 120 and the support rod 130 are welded by laser welding, which has a small impact on the stress changes of the components, reduces stress deformation interference introduced by the welding operation, and ensures assembly accuracy. Brazing can be used for welding other non-threaded fixed parts.

[0025] The assembly device includes a first positioning module and a second positioning module. The second positioning module includes a second base 210, a support 220 and a pressure plate 230, which are used for positioning the cathode 120 to the focusing electrode 110 and for positioning the cathode module as a whole. The first positioning module is used for positioning the support rod 130 and includes a first base 310 and a first positioning rod 320 that is upright and fixed on the first base 310. A first positioning groove 311 is provided on the first base 310.

[0026] After the cathode module is positioned and fixed on the second positioning module, it is transferred as a whole to the first positioning module. At this time, the second base 210 of the second positioning module is upright and embedded in the first positioning groove 311, and the top of the first positioning rod 320 contacts and matches the support rod 130. The corresponding state is as follows: Figure 2 As shown, this can effectively ensure the fixation effect of the support rod 130 during assembly and improve the assembly accuracy of the support rod 130 and the cathode 120.

[0027] The second base 210 has a second positioning groove 211 laterally formed. A mounting hole is provided on the side of the second positioning groove 211 for screwing the focusing electrode 110 to the second positioning groove 211. The second positioning groove 211 extends through the second base 210 to allow for confirmation of the back structure of the cathode module from the back, and also facilitates the assembly of the focusing electrode 110 and the support rod 130. In this embodiment, the port of the second positioning groove 211 matches the step of the focusing electrode 110, ensuring the flatness of the connection between the focusing electrode 110 and the second base 210 through the step surface, thereby ensuring the levelness of the support rod 130 during assembly and ensuring the reliability of the first positioning rod 320's orientation positioning of the support rod 130.

[0028] The support 220 has a cap-shaped structure and can be installed over the focusing electrode 110 to form an operating space outside the focusing electrode 110. One side of the cap-shaped structure is open to form an operating window. The connection area between the support rod 130 and the cathode 120 is located in the operating space and exposed through the operating window so that welding can be performed through the operating window.

[0029] The pressure plate 230 is set outside the plate surface of the support 220. The pressure plate 230 and the support 220 can be fixed to the focusing electrode 110 by screws. A third positioning groove is provided in the clamping space between the support 220 and the pressure plate 230. The thickness of the clamping area formed by the third positioning groove is less than or equal to the thickness of the cathode 120 disk surface, so that after the support 220 and the pressure plate 230 are clamped and fixed, the cathode 120 can be flattened and pressed into shape.

[0030] The plate surface of the support 220 is also provided with a through hole, which connects to the third positioning groove. The through hole is straight out from the side of the operation window so that after the cathode module is assembled, the support 220 can be moved and removed along the plate surface of the focusing electrode 110 while maintaining the fixed posture of the cathode 120. The direction of the removal operation is parallel to the direction of the through hole on the plate surface of the support 220 to avoid touching the cathode 120 during the removal of the support 220, thereby ensuring the reliability of the posture positioning of the cathode 120.

[0031] After the cathode module is assembled, it can be removed from the first positioning module along with the second positioning module. After removal, lay it horizontally on the operating table. First, remove the pressure plate 230. The corresponding state is as follows: Figure 3 As shown, move and remove the support 220, then remove the cathode module to obtain the assembled cathode module.

[0032] To improve the accuracy of removing the support 220 and the pressure plate 230, in this embodiment, the support 220 is provided with two sets of screw holes, which are used to fix the focusing electrode 110 and the pressure plate 230 respectively. Generally, when removing the pressure plate 230, the support 220 and the focusing electrode 110 can be fixed by one of the screws.

[0033] After removing the pressure plate 230, the support 220 can be removed while the device is in an upright position, or the second base 210 can be laid horizontally on the operating table for operation. The operating table needs to provide an opening to allow the fixing screws between the collector 110 and the support 220 to be unscrewed from below. Alternatively, the cap end of the fixing screw between the collector 110 and the pressure plate 230 can be placed on the plate surface of the support 220. Figure 3 In the corresponding posture, the fixing screws between the collector 110 and the support 220 can be released by operation from above.

[0034] The focusing electrode 110, the support 220, and the pressure plate 230 need to be pressed and fixed together. The screw connection needs to be matched with the screw hole and the through hole. The arrangement logic of the screw hole and the through hole can be determined according to the specific screw connection method. For example, if the cap end of the screw connecting the focusing electrode 110 and the support 220 is set on the support 220 side, then the screw hole is set on the focusing electrode 110; if the cap end of the screw connecting the focusing electrode 110 and the support 220 is set on the focusing electrode 110 side, then the screw hole is set on the support 220.

[0035] When the second base 210 is in an upright position, and the support 220 is removed, the empty set of screw holes after the pressure plate 230 is removed can be used to position the support 220, preventing the support 220 from falling off naturally after the other set of screws are removed. The removal of the support 220 can be achieved by equipment such as a linear robotic arm to ensure reliable translation.

[0036] To facilitate the positioning of the cathode 120 between the support 220 and the pressure plate 230, in this embodiment, a third positioning groove is provided on the support 220, and a protrusion that can be embedded in the third positioning groove is provided on the pressure plate 230, so that when the pressure plate 230 is removed, the pressure plate 230 can be prevented from touching the cathode 120 inside.

[0037] To facilitate the alignment of the support 220 to the focusing electrode 220, in this embodiment, the focusing electrode 110 protrudes from the center of the side pointing towards the cathode 120 to form a focusing functional body 111. The inner sidewall of the pressure plate 220 fits and matches the sidewall of the focusing functional body 111, enabling the assembly and positioning of the support 220 to the focusing electrode 220. After positioning, the fixing screws are installed. Furthermore, the span of the fitting area is less than or equal to 180 degrees to facilitate the translational removal of the support 220.

[0038] To facilitate the installation of the second positioning module onto the first positioning module, in this embodiment, the side of the first positioning groove 311 away from the first positioning rod 320 is an open structure. This avoids the need for precision machining of the four side walls of the first positioning groove 311, reducing production costs. Furthermore, the position of the second positioning module can be finely adjusted by sliding along the first positioning groove 311, thereby adjusting the contact position between the first positioning rod 320 and the support rod 130, which can accommodate different lead-out lengths of the support rod 130.

[0039] Depending on the span of the area surrounding the support 220, when the first positioning rod 320 needs to pass through the support 220, an opening can be provided on the surrounding side wall of the support 220.

[0040] To improve the positioning effect of the first positioning rod 320 on the support rod 130, in this embodiment, as follows: Figure 2 As shown, a fourth positioning groove is provided at the top of the first positioning rod 320, and the fourth positioning groove fits snugly against the support rod 130. To ensure the quality of the accelerating electric field, most of the cathode module has a rotationally symmetric structure. Correspondingly, the support rod 130 is cylindrical, and the fourth positioning groove is an arc-shaped groove structure.

[0041] like Figure 5 As shown, to ensure the symmetrical structure of the cathode module, in this embodiment, four mounting holes are arranged around the focusing electrode 110. Since the support 130 needs to have a window for internal welding operations, only three of the mounting holes are used to fix the support 130 to the focusing electrode 110. The actual number of mounting holes used can be determined according to the window position of the support 130. The four mounting holes on the focusing electrode 110 can also be used for the assembly of the cathode module to the X-ray tube.

[0042] To facilitate the assembly of the support rod 130 and the focusing electrode 110, in this embodiment, as follows: Figure 5 As shown, the cathode module also includes a ceramic ring 150 and a sleeve 140. The support rod 130 is sleeved in the sleeve 140, and the sleeve 140 is disposed in the ceramic ring 150. The ceramic ring 150 is coaxially fixed with the focusing electrode 110.

[0043] To ensure the shaping effect of the tungsten cathode 120 itself, in this embodiment, as follows: Figure 6 and Figure 7 As shown, it also includes a cathode shaping module for high-temperature shaping before cathode 120 assembly. The cathode shaping module includes a left shaping fixture 410, a right shaping fixture 420, and a pressure block 430.

[0044] The left shaping fixture 410 and the right shaping fixture 420 are provided with cathode pin holes 402 on their mold closing surfaces; the mold closing structure of the left shaping fixture 410 and the right shaping fixture 420 is a stepped structure, and a shaping groove 401 is provided on the upper step of the stepped structure for positioning the cathode 120. The side of the shaping groove 401 facing the lower step of the stepped structure is an open structure to facilitate the arrangement of a pin. A cathode pin hole is also provided in the middle of the shaping groove 401; the pressure block 430 fits and matches the upper step to press the cathode 120 platen positioned in the shaping groove 401.

[0045] In a specific example, the cathode shaping module is made of molybdenum, and the corresponding cathode shaping process includes: In the hydrogen atmosphere of the hydrogen furnace, the temperature of the hydrogen furnace is raised from the first temperature to the second temperature according to the first heating time, and then held for the first holding time. After that, the temperature of the hydrogen furnace is raised to the third temperature according to the second heating time, and then held for the second holding time to complete the shaping.

[0046] The hydrogen environment has a dew point below -43 degrees Celsius and a purity greater than 99.99%. The first heating time is 2.5 to 3 hours, the first temperature is 10 to 30 degrees Celsius, the second temperature is 850 to 880 degrees Celsius, the first holding time is 0.5 to 1 hour, the second heating time is 20 to 30 minutes, and the third temperature is 900 to 1000 degrees Celsius, with a second holding time of 0.5 to 1 hour. After setting, it is allowed to cool naturally.

[0047] In another specific example, the cathode shaping module is made of stainless steel, and the corresponding cathode shaping process includes: In the vacuum environment of the vacuum furnace, the temperature of the vacuum furnace is raised from a first temperature to a second temperature according to a first heating time, and held at the temperature for a first holding time to remove water vapor; The vacuum furnace temperature is raised to the third temperature according to the second heating time, and the temperature is held for a second holding time. The gas is removed so that the vacuum degree meets the preset vacuum degree conditions. The vacuum furnace temperature is raised to the fourth temperature according to the third heating time, and then held for a third holding time to equalize the temperature inside the vacuum furnace. The vacuum furnace temperature is raised to the fifth temperature according to the fourth heating time, and the shape is completed after the fourth holding time.

[0048] The process involves several steps: the first heating time is 20-30 minutes, the first temperature is 10-30℃, the second temperature is 120-150℃, and the first holding time is 20-30 minutes; the second heating time is 30-60 minutes, the third temperature is 450-500℃, and the second holding time is 1-1.5 hours, with a vacuum level of 5×10E-4 Pa; the third heating time is 30-60 minutes, the fourth temperature is 700-750℃, and the third holding time is 1.5-2 hours; the fourth heating time is 30-50 minutes, the fifth temperature is 800-900℃, and the fourth holding time is 1.5-2 hours. After setting, the material is allowed to cool naturally.

[0049] The cathode module assembled by the assembly device according to the present invention was tested, and the flatness of the cathode disk surface could be controlled within 50μm~100μm. Compared with the 250μm~300μm of the prior art, the flatness of the cathode disk surface can be effectively improved, thereby improving the performance of the X-ray tube.

[0050] This invention provides an assembly device for a circumferential X-ray tube cathode module. The cathode module is positioned within a second positioning module and subsequently within a first positioning module. A support rod in the cathode module contacts and positions itself against a first positioning rod in the first positioning module. The second positioning module clamps the cathode disk surface using a support and a pressure plate, and positions it onto the focusing electrode using screws. During welding from the cathode to the support rod, the cathode's positioning stability is ensured. After welding, the cathode module is removed from the first positioning module along with the second positioning module. The pressure plate and support are then moved and removed sequentially. This translational operation avoids interference with the cathode during mold opening, ensuring the cathode's flatness. Overall, this effectively reduces interference from various assembly operations on the cathode disk surface, improves the cathode disk surface flatness, and enhances the X-ray tube's performance.

[0051] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The embodiments described above are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An assembly device based on a circumferential X-ray tube cathode module, characterized in that, The cathode module includes a focusing electrode and a cathode. A support rod is coaxially mounted in the focusing electrode, and the support rod passes through the focusing electrode. The cathode is welded and fixed to the support rod. The assembly device includes: The first positioning module includes a first base and a first positioning rod that is upright and fixed on the first base. The first base is provided with a first positioning groove. The second positioning module includes a second base, a support, and a pressure plate, wherein... The second base is erected in the first positioning groove, and the second base has a second positioning groove opened laterally. The focusing electrode can be fixedly installed in the second positioning groove by screws. When the cathode module is fixedly installed in the second positioning module, the support rod can be positioned against the top of the first positioning rod; The support is a hat-shaped structure and can be installed outside the focusing electrode to form an operating space outside the focusing electrode. One side of the hat-shaped structure is open to form an operating window. The connection area between the support rod and the cathode is located in the operating space and exposed through the operating window. The pressure plate is disposed outside the plate surface of the support. The pressure plate and the support can be fixed to the focusing electrode by screws. A third positioning groove is provided in the clamping space between the support and the pressure plate. The thickness of the clamping area formed by the third positioning groove is less than or equal to the thickness of the cathode disk surface. The support plate surface is also provided with a through hole, which connects to the third positioning groove, and the through hole is straight out from the side of the operation window so that after the cathode module is assembled, the support can be moved and removed along the plate surface of the focusing electrode while maintaining the fixed posture of the cathode.

2. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, The third positioning groove is provided on the support, and the pressure plate is provided with a protrusion that can be embedded in the third positioning groove.

3. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, The focusing electrode protrudes from the center of one side of the cathode to form a focusing functional body. The inner sidewall of the pressure plate fits and matches the sidewall of the focusing functional body, and the span of the fitting area is less than or equal to 180 degrees.

4. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, The side of the first positioning groove away from the first positioning rod is an open structure.

5. The assembly apparatus based on a circumferential X-ray tube cathode module according to claim 1 or 4, characterized in that, The top of the first positioning rod is provided with a fourth positioning groove, which fits and matches the support rod.

6. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, The support is provided with two sets of mounting holes, which are used for screwing the focusing electrode and the pressure plate, respectively.

7. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, The cathode module also includes a ceramic ring and a sleeve. The support rod is sleeved in the sleeve, the sleeve is disposed in the ceramic ring, and the ceramic ring is coaxially fixed with the focusing electrode.

8. The assembly device based on the circumferential X-ray tube cathode module according to claim 1, characterized in that, It also includes a cathode shaping module for high-temperature shaping before cathode assembly. The cathode shaping module comprises a left shaping fixture, a right shaping fixture, and a pressure block. Cathode pin holes are provided on the mold closing surfaces of the left and right shaping fixtures; The mold closing structure of the left and right shaping fixtures is a stepped structure. A shaping groove is provided on the upper step of the stepped structure for positioning the cathode disk. The side of the shaping groove facing the lower step of the stepped structure is an open structure. The pressure block fits and matches the upper step surface.

9. The assembly device based on the circumferential X-ray tube cathode module according to claim 8, characterized in that, The cathode shaping module is made of molybdenum, and the corresponding cathode shaping process includes: In the hydrogen atmosphere of the hydrogen furnace, the temperature of the hydrogen furnace is raised from the first temperature to the second temperature according to the first heating time, and then held for the first holding time. After that, the temperature of the hydrogen furnace is raised to the third temperature according to the second heating time, and then held for the second holding time to complete the shaping.

10. The assembly apparatus based on a circumferential X-ray tube cathode module according to claim 8, characterized in that, The cathode shaping module is made of stainless steel, and the corresponding cathode shaping process includes: In the vacuum environment of the vacuum furnace, the temperature of the vacuum furnace is raised from a first temperature to a second temperature according to a first heating time, and held at the temperature for a first holding time to remove water vapor; The vacuum furnace temperature is raised to the third temperature according to the second heating time, and the temperature is maintained for the second holding time. The gas is removed so that the vacuum degree meets the preset vacuum degree conditions. The vacuum furnace temperature is raised to the fourth temperature according to the third heating time, and then held for a third holding time to equalize the temperature inside the vacuum furnace. The vacuum furnace temperature is raised to the fifth temperature according to the fourth heating time, and the shape is completed after the fourth holding time.

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