X-ray tube cathode assembly assembling method, tool and X-ray tube

Abstract

The application provides an X-ray tube cathode assembly assembling method, a tool and an X-ray tube. The method comprises the following steps: S100: pre-positioning a filament and a pin, so that the filament and the pin reach an assembling distance, to obtain a pre-assembled filament assembly; pre-positioning the filament assembly and a ceramic assembly and assembling the filament assembly to the ceramic assembly; S200: inspecting and adjusting the filament concentricity of the pre-assembled filament assembly, so that the concentricity is consistent with a cathode focusing electrode to be assembled; S300: assembling the cathode focusing electrode to the filament assembly whose concentricity has been adjusted, to obtain a cathode assembly in which the filament is concentric with the cathode focusing electrode. By using the assembling method and the tool, the assembling position of the filament can be accurately controlled, the concentricity of the filament and the cathode focusing hole is ensured, efficient assembly and welding of the cathode assembly are realized, the filament assembling time is greatly shortened, and the production efficiency and product performance are improved.

Description

Technical Field

[0001] This application belongs to the field of X-ray tube technology, and relates to an X-ray tube cathode assembly method, tooling and X-ray tube. Background Technology

[0002] An X-ray tube is a device that generates X-rays. Its main working principle is that electrons emitted from the cathode in a vacuum bombard the anode target under the influence of a high-voltage electric field, thus emitting X-rays. An X-ray tube mainly consists of a cathode, an electron focusing structure, an anode target, and a tube shell structure that ensures vacuum and insulation. In the field of X-ray tube technology, the filament is the key emission source, and its installation position has a significant impact on the performance of the X-ray tube. Specifically, the filament's installation position directly determines the focal spot size and focusing effect of the X-ray tube, and these parameters further affect the imaging quality and lifespan of the X-ray tube.

[0003] However, controlling the assembly position of the filament during actual research and production presents numerous challenges. First, the extremely small size of the filament and the compact structure of its tightly wound section make assembly extremely delicate and complex. Second, the small size of the focusing aperture requires a very high degree of concentricity between the filament and the aperture, undoubtedly increasing the assembly difficulty. Furthermore, the difficulty in adjusting the concentricity between the filament and the focusing stage aperture can easily lead to filament misalignment, thus affecting the focusing and emission capabilities of the electron beam. Improper assembly at the tightly wound filament section can cause short circuits, which not only reduces the performance of the X-ray tube but may also lead to equipment malfunction or even damage.

[0004] Therefore, how to accurately control the installation position of the filament, ensure its concentricity with the focusing aperture, and prevent short circuits at the tightly wound points has become a pressing technical challenge in the field of X-ray tube technology. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this application is to provide an X-ray tube cathode assembly method, tooling and X-ray tube, to solve one or more problems existing in the X-ray tube manufacturing process of the prior art.

[0006] To achieve the above and other related objectives, in a first aspect, this application provides a method for assembling an X-ray tube cathode assembly, comprising the following steps:

[0007] S100: Pre-position the filament and the pin to achieve an assembly distance between them to obtain a pre-assembled filament assembly; pre-position the filament assembly and the ceramic assembly and assemble the filament assembly onto the ceramic assembly;

[0008] S200: Inspect and adjust the concentricity of the filaments of the pre-assembled filament assembly so that its concentricity is consistent with that of the cathode focusing electrode to be assembled.

[0009] S300: Assemble the cathode focusing electrode onto the filament assembly that has been concentrically adjusted to obtain a cathode assembly in which the filament and the cathode focusing electrode are concentric.

[0010] In some embodiments, the filament assembly includes pins disposed on the ceramic assembly and a filament located at the end of the pins connecting a plurality of the pins; in step S100, the ceramic assembly is first positioned to determine the assembly reference position of the filament assembly, and then the filament and the pins are adjusted to reach the assembly distance by means of a filament welding fixture, and the ceramic assembly and the filament assembly are pre-assembled.

[0011] In some embodiments, the filament welding fixture includes a welding base having a first receiving cavity recessed from its surface and an isolation portion protruding from its surface, the isolation portion having a groove that coincides with the filament pre-assembly position of the filament assembly.

[0012] The ceramic component is snapped into and positioned inside the first receiving cavity of the filament welding fixture. The filament component contacts the upper surface of the welding base. The pins are spaced apart by the isolation part and the filament at the end of the pins is placed in the groove to determine the assembly distance between the filament and the pins, thus completing the pre-assembly of the filament component.

[0013] In some embodiments, in step S200, the concentricity of the filament is inspected using a filament inspection fixture. The filament inspection fixture has a calibration part with an opening that faces the tightly wound section of the filament and is coaxial and equal in diameter with the focusing hole of the cathode focusing electrode. The filament concentricity is inspected by verifying whether the center of the tightly wound section is concentric with the center of the opening.

[0014] In some embodiments, step S300, the step of assembling the cathode focusing electrode, includes:

[0015] A first pressure ring is provided, the first pressure ring having a through hole for receiving a cathode focusing electrode and a stepped structure for engaging a cathode assembly;

[0016] Position the sealing component by engaging the stepped structure inside the first pressure ring, then assemble the cathode focusing electrode onto the sealing component, and assemble the filament assembly that has completed the concentricity test onto the cathode focusing electrode.

[0017] A pressure plate is provided and placed on top of the cathode assembly. A second pressure ring is provided and sleeved on the outside of the cathode assembly and the first pressure ring to fix the cathode assembly, thereby completing the overall assembly of the X-ray tube cathode assembly.

[0018] Secondly, this application also provides an X-ray tube cathode assembly tooling, comprising at least:

[0019] A filament welding fixture is used to position the ceramic component and filament component of the cathode assembly. The filament component completes a pre-assembly process with the ceramic component on the filament welding fixture.

[0020] The filament inspection fixture is equipped with a calibration section for inspecting the concentricity of the filament assembly after the pre-assembly process.

[0021] The filament assembly fixture includes a first pressure ring and a second pressure ring coaxial with the first pressure ring. The first pressure ring has a through hole for accommodating the cathode focusing electrode and a stepped structure for engaging the cathode assembly. The second pressure ring is sleeved on the outside of the cathode assembly and the first pressure ring to fix the cathode assembly and complete the overall assembly of the X-ray tube cathode assembly.

[0022] In some embodiments, both the filament welding fixture and the filament inspection fixture include clamps and fasteners. The clamps are used to fix the ceramic components to the corresponding fixtures, and the fasteners are used to lock the clamps to the corresponding fixtures.

[0023] In some embodiments, the calibration section of the filament inspection fixture may be movable relative to the extension direction of the pins of the filament assembly.

[0024] In some embodiments, the filament assembly fixture further includes a pressure plate disposed inside the second pressure ring and abutting against the exhaust end of the cathode assembly to fix the cathode assembly.

[0025] Thirdly, this application also provides an X-ray tube, which includes a cathode assembly, and the cathode assembly is obtained by assembling the X-ray tube cathode assembly method described in any one of the above technical solutions.

[0026] As described above, the X-ray tube cathode assembly method and tooling provided by this application can precisely control the assembly position of the filament, ensure its concentricity with the cathode focusing hole, realize efficient assembly and welding of the cathode assembly, greatly shorten the filament assembly time, and improve production efficiency and product performance. Attached Figure Description

[0027] Figure 1 The diagram shows the structure of the X-ray tube cathode assembly.

[0028] Figure 2 The diagram shown is a structural schematic of the filament welding fixture provided in this application.

[0029] Figure 3 Displayed as Figure 2 A magnified view of a portion of the image;

[0030] Figure 4 This is a schematic diagram illustrating the principle of positioning using a filament welding fixture;

[0031] Figure 5 The diagram shown is a structural schematic of the filament inspection fixture provided in this application.

[0032] Figure 6 The diagram shows the principle of using a filament inspection fixture for concentricity calibration.

[0033] Figure 7 This is a structural schematic diagram showing one perspective of the filament assembly tooling provided in this application;

[0034] Figure 8 This is a structural schematic diagram showing another perspective of the filament assembly tooling provided in this application;

[0035] Figure 9 The diagram shown is a schematic representation of the internal structure of the filament assembly tooling provided in this application.

[0036] Component designation explanation

[0037] 1. Filament welding fixture

[0038] 10 Welding base

[0039] 101 First accommodating cavity

[0040] 102 Limiting Part

[0041] 103 Isolation Department

[0042] 104 Grooves

[0043] 11 Welding clamps

[0044] 12 First fastener

[0045] 2. Filament inspection fixture

[0046] 20 Inspection base

[0047] 201 Second accommodating cavity

[0048] 202 Calibration Department

[0049] 21. Inspect the clamps

[0050] 22 Second fastener

[0051] 3 Filament assembly fixture

[0052] 30 pressure plate

[0053] 31 First pressure ring

[0054] 311 Through Hole

[0055] 32 Second pressure ring

[0056] 4. Cathode assembly

[0057] 40 Ceramic Components

[0058] 41 Filament

[0059] 42 pins

[0060] 43 Exhaust Structure

[0061] 44 Sealing components

[0062] 5. Cathode Focusing Electrode Detailed Implementation

[0063] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of this application. For ease of explanation, when detailing the embodiments of this application, the cross-sectional views illustrating the device structure are partially enlarged and not proportional to the general scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this application. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0064] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0065] Please see Figures 1 to 9 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0066] Example 1:

[0067] See Figure 1 The X-ray tube cathode assembly 4 structure includes at least a ceramic assembly 40 and a filament assembly. The ceramic assembly 40 is cylindrical and has a through hole that runs vertically through the ceramic assembly 40. The filament assembly includes pins 42 disposed on the through hole of the ceramic assembly 40 and a filament 41 located at the end of the pins 42 and connecting several pins 42. The pins 42 are made of Kovar alloy 4J34. In this embodiment, the X-ray cathode assembly 4 has two pins 42 arranged parallel to each other, corresponding to the two core through holes of the ceramic assembly 40. Component 40 ensures a stable connection between pin 42 and filament 41. The ceramic component 40 is also provided with an exhaust structure 43, which is inserted into the tail end of the ceramic component 40 to ensure that the tube is in a high vacuum state and maintain the normal operation of the X-ray tube. The exhaust structure 43 is a metal exhaust pipe, which is welded to the exhaust through hole of the ceramic component 40 for venting and vacuuming the X-ray tube cavity. The exhaust structure 43 is a thin-walled metal pipe, such as oxygen-free copper material that is easy to seal. The metal exhaust pipe and the exhaust through hole are welded by vacuum brazing.

[0068] See Figures 2-9 This embodiment provides a method for assembling an X-ray tube cathode assembly, including the following steps:

[0069] S100: See also Figures 2-4 The filament 41 and the pin 42 are pre-positioned so that the filament 41 and the pin 42 reach a preset assembly distance to obtain a pre-assembled filament assembly; the filament assembly and the ceramic assembly 40 are pre-positioned and the filament assembly is assembled onto the ceramic assembly 40.

[0070] Specifically, see [link to relevant documentation] Figures 2-4 The filament welding fixture 1 includes a welding base 10, which has a first accommodating cavity 101 recessed from its surface and an isolation portion 103 protruding from its surface. The isolation portion 103 is oriented in the same direction as the pins 42 and separates the two pins 42 to prevent short circuits during welding. In addition, the isolation portion 103 also has an auxiliary positioning function to ensure that the pins 42 are placed accurately. A groove 104 is formed on the isolation portion 103, which is aligned with the pre-assembly position of the filament 41 of the filament assembly and is perpendicular to the extending direction of the isolation portion 103.

[0071] The method of using the filament welding fixture 1 is as follows: First, position the ceramic component 40, snap the ceramic component 40 into the first receiving cavity 101 of the filament welding fixture 1 and position it to determine the assembly reference position of the filament component. The filament component contacts the upper surface of the welding base 10. The pins 42 are separated by the isolation part 103 and the filament 41 at the end of the pins 42 is placed in the groove 104 to determine the assembly distance between the filament 41 and the pins 42. When the filament 41 is placed in the groove 104, the relative position between the filament 41 and the pins 42 is the appropriate assembly position of the cathode component 4. Different models of cathode components have different assembly distances. The setting position of the groove 104 can be adjusted and changed according to the actual use. Then, the pre-assembly of the filament component and the ceramic component 40 is completed. Understandably, due to the extremely small diameter of the filament in the miniature filament assembly, typically around 0.06 mm, and the extremely small size of the tightly wound section of the filament 41, typically around 1 mm, controlling the welding positioning of the filament 41 and the pin 42 is quite difficult. Misalignment in the welding position will lead to a decrease in the focusing and emission capabilities of the X-ray tube's electron beam. However, by providing the filament welding fixture 1 to determine the relative distance between the filament 41 and the pin 42, as well as the relative position of the filament assembly and the ceramic assembly 40, the assembly accuracy of the product can be well controlled, improving the working performance of the X-ray tube.

[0072] S200: See also Figures 5-6 Inspect and adjust the concentricity of the filaments in the pre-assembled filament assembly so that its concentricity is consistent with that of the cathode focusing electrode 5 to be assembled.

[0073] Specifically, see [link to relevant documentation] Figures 5-6 The concentricity of the filament 41 is inspected using a filament inspection fixture 2. The fixture 2 includes an inspection base 20 with a second recessed cavity 201. A calibration section 202 is located at the end of the second cavity 201, with an opening directly opposite the tightly wound section of the filament 41 and coaxial with the focusing aperture of the cathode focusing electrode 5. The concentricity of the filament is checked by verifying whether the center of the tightly wound section is concentric with the center of the opening. When the center of the tightly wound section and the center of the opening are concentric, it indicates that the filament 41 and the cathode focusing electrode 5 to be assembled are also concentric. The X-rays emitted by the cathode assembly 4 can then exit smoothly from the cathode focusing electrode 5, resulting in good focusing performance and extending the product's lifespan.

[0074] S300: See also Figures 7-9 The cathode focusing electrode 5 is assembled onto the filament assembly that has been concentrically adjusted to obtain a cathode assembly 4 in which the filament 41 and the cathode focusing electrode 5 are concentric.

[0075] Specifically, see [link to relevant documentation] Figures 8-9 The steps for assembling the cathode focusing electrode 5 include:

[0076] A first pressure ring 31 is provided, the first pressure ring 31 having a through hole 311 for accommodating the cathode focusing electrode 5 and a stepped structure for engaging the cathode assembly 4;

[0077] The sealing member 44 is positioned by engaging the stepped structure inside the first pressure ring 31, and then the cathode focusing electrode 5 is assembled onto the sealing member 44, and the filament assembly that has completed the concentricity test is assembled onto the cathode focusing electrode 5.

[0078] A pressure plate 30 is provided and placed on top of the cathode assembly 4. A second pressure ring 32 is provided and sleeved on the outside of the cathode assembly 4 and the first pressure ring 31 to fix the cathode assembly 4, thereby completing the overall assembly of the X-ray tube cathode assembly 4.

[0079] In an optional implementation, after each of the above-mentioned processes is completed, the automatic gripping system determines the product's position and picks it up for processing in the next process. The gripping system operates on a similar principle to multi-stage robotic arms in existing technologies, and will not be elaborated upon here. It is understood that after each process is completed, the product can also be manually picked up and moved to the next process. The specific operations between processes are freely selected based on a comprehensive judgment of various factors, including the actual processing scenario and the tooling setup.

[0080] Example 2:

[0081] See Figures 2-9 This embodiment provides an X-ray tube cathode assembly fixture, which includes at least a filament welding fixture 1, a filament inspection fixture 2, and a filament assembly fixture 3, specifically:

[0082] See Figures 2-4 The filament welding fixture 1 is used to position the ceramic component 40 of the cathode assembly 4 and the filament assembly. The filament assembly completes the pre-assembly process with the ceramic component 40 on the filament welding fixture.

[0083] The filament welding fixture 1 includes a welding base 10, which has a first receiving cavity 101 recessed from its surface and an isolation portion 103 protruding from its surface. A groove 104 is formed on the isolation portion 103, which corresponds to the pre-assembly position of the filament 41 of the filament assembly. First, the ceramic assembly 40 is positioned and engaged inside the first receiving cavity 101 of the filament welding fixture 1, thus determining the assembly reference position of the filament assembly. The filament welding fixture 1 also includes a welding clamp 11, which is fastened to the welding base 10 and locks the ceramic assembly 40 precisely in place with the first receiving cavity 101. A first fixing member 12 is provided on the welding clamp 11 and the welding base 10 to lock the welding clamp 11 and prevent displacement during welding. In an optional embodiment, the first fixing member 12 is a bolt fastener. After the ceramic assembly 40 is locked, the filament assembly contacts the upper surface of the welding base 10. The pins 42 are spaced apart by the isolation portion 103, and the filaments 41 at the ends of the pins 42 are placed in the groove 104 to determine the assembly distance between the filaments 41 and the pins 42. When the filaments 41 are placed in the groove 104, the relative position between the filaments 41 and the pins 42 is the appropriate assembly position for the cathode assembly 4. The pre-assembly of the filament assembly and the ceramic assembly 40 is then completed. It is understood that different models of cathode assemblies have different assembly distances, and the setting position of the groove 104 can be adjusted and changed according to actual usage.

[0084] In an optional embodiment, the isolation section 103 includes a first isolation section and a second isolation section separated by a groove 104. The first isolation section is located between the pins 42. Both the first isolation section and the second isolation section are detachable structures to facilitate adjustment of the position of the groove 104, thereby broadening the application range of the tooling to meet the assembly and use of different types of cathode assemblies.

[0085] See Figures 5-6 The filament inspection fixture 2 is equipped with a calibration unit 202, which is used to inspect the concentricity of the filament assembly after the pre-assembly process.

[0086] The filament inspection fixture 2 includes an inspection base 20, which has a second recessed cavity 201. It also includes a welding clamp 21, which is fastened to the welding base 20 and locks the ceramic assembly 40 precisely in place with the second recessed cavity 201. A second fixing member 22 is provided on the welding clamp 21 and the welding base 20 to lock the welding clamp 21 and prevent displacement during welding. In an optional embodiment, the second fixing member 22 is a bolt fastener. A calibration part 202 is provided at the end of the second recessed cavity 201. The calibration part 202 has an opening that faces the tightly wound section of the filament 41 and is coaxial and has the same diameter as the focusing hole of the cathode focusing electrode 5. The filament concentricity is checked by verifying whether the center of the tightly wound section is concentric with the center of the opening. When the center of the tightly wound section and the center of the opening are concentric, it indicates that the filament 41 and the cathode focusing electrode 5 to be assembled are also concentric, and the X-rays emitted by the cathode assembly 4 can be smoothly emitted from the cathode focusing electrode 5. When they are not concentric, it is necessary to adjust the pin 42 in time or further adjust the soldering of the filament 41 to fine-tune the concentricity of the tightly wound section of the filament 41.

[0087] In an optional embodiment, the calibration part 202 of the filament inspection fixture 2 can be moved relative to the extension direction of the pin 42 of the filament assembly to meet the assembly and use of different types of cathode assemblies.

[0088] See Figures 7-9 The filament assembly fixture 3 includes a first pressure ring 31 and a second pressure ring 32 coaxial with the first pressure ring 31. The first pressure ring 31 has a through hole 311 for accommodating the cathode focusing electrode 5 and a stepped structure for engaging the cathode assembly 4. The sidewall of the cathode focusing electrode 5 is arranged around the periphery of multiple pins 42 for focusing the electron beam. In an optional embodiment, the cathode focusing electrode 5 is made of stainless steel 316L with a polished surface, and is welded to the sealing member 44 using resistance welding or laser welding.

[0089] The second pressure ring 32 is sleeved on the outside of the cathode assembly 4 and the first pressure ring 31 to fix the cathode assembly 4, thus completing the overall assembly of the X-ray tube cathode assembly 4. In some embodiments, the filament assembly fixture further includes a pressure plate 30, which is disposed inside the second pressure ring and abuts against the exhaust end of the cathode assembly 4 to fix the cathode assembly 4.

[0090] In an optional embodiment, the filament welding fixture 1 and the filament inspection fixture 2 are designed as separate units or as an integrated unit arranged side by side, with the two fixtures sharing a base to save space and facilitate operation. The filament assembly fixture 3 can be set up independently according to the actual processing environment.

[0091] This embodiment also provides an X-ray tube, which includes a cathode assembly 4, an anode assembly, and a tube shell. The cathode assembly 4 is obtained by assembling the X-ray tube cathode assembly 4 using the assembly methods and tooling described in Embodiments 1 and 2. The anode assembly and tube shell structures are common product component structures and will not be described in detail here.

[0092] In summary, the X-ray tube cathode assembly method and tooling provided in this application can precisely control the assembly position of the filament 41, ensuring its concentricity with the cathode focusing hole, achieving efficient assembly and welding of the cathode assembly, greatly shortening the filament assembly time, and improving production efficiency and product performance. Therefore, this application effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0093] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. An X-ray tube cathode assembly tooling, characterized by, At least comprising: A filament welding tool, comprising a welding base, the welding base having a first accommodating cavity recessed from the surface thereof and a partition protruding from the surface thereof, a groove being formed on the partition, the groove being consistent with the filament pre-assembly position, for positioning the ceramic assembly and the filament assembly of the cathode assembly, the filament assembly being pre-assembled with the ceramic assembly on the filament welding tool; A filament inspection tool, comprising an inspection base, the inspection base having a second accommodating cavity recessed from the surface thereof, an end of the second accommodating cavity being provided with a calibration portion, the calibration portion being provided with an opening, the opening being opposite to the tightly wound portion of the filament and coaxial with the focusing hole of the cathode focusing electrode, for inspecting the concentricity of the filament assembly after the pre-assembly process; A filament assembly tool, comprising a first compression ring and a second compression ring coaxial with the first compression ring, the first compression ring having a through hole for accommodating the cathode focusing electrode and a stepped structure for clamping the cathode assembly, the second compression ring being sleeved outside the cathode assembly and the first compression ring, for fixing the cathode assembly, to complete the overall assembly of the X-ray tube cathode assembly.

2. The X-ray tube cathode assembly tooling of claim 1, wherein, The filament welding tool and the filament inspection tool both comprise a clamp and a fixing member, the clamp being used for fixing the ceramic assembly to the corresponding tool, and the clamp being locked with the corresponding tool through the fixing member.

3. The X-ray tube cathode assembly tooling of claim 1, wherein, The calibration portion of the filament inspection tool is relatively movable relative to the extension direction of the pin of the filament assembly.

4. The X-ray tube cathode assembly tooling of claim 1, wherein, The filament assembly tool further comprises a pressing plate, the pressing plate being arranged inside the second compression ring and abutting against the exhaust end of the cathode assembly, for fixing the cathode assembly.

5. A method of assembling an X-ray tube cathode assembly, characterized by, The X-ray tube cathode assembly tool of any one of claims 1 to 4 is used for assembly, comprising the following steps: S100: pre-positioning the filament and the pin, so that the filament and the pin reach an assembly distance, to obtain a pre-assembled filament assembly; pre-positioning the filament assembly and the ceramic assembly and assembling the filament assembly to the ceramic assembly; S200: inspecting and adjusting the filament concentricity of the pre-assembled filament assembly, so that the concentricity is consistent with the cathode focusing electrode to be assembled; S300: assembling the cathode focusing electrode to the filament assembly after the concentricity adjustment, to obtain a cathode assembly in which the filament is concentric with the cathode focusing electrode.

6. The X-ray tube cathode assembly assembly method of claim 5, wherein, The filament assembly comprises a pin arranged on the ceramic assembly and a filament at the end of the pin for connecting a plurality of pins; in step S100, the ceramic assembly is first positioned, the assembly reference position of the filament assembly is determined, and then the filament and the pin are adjusted to reach an assembly distance through the filament welding tool, to pre-assemble the ceramic assembly and the filament assembly.

7. The method of claim 6, wherein the method further comprises: The filament welding tool comprises a welding base, the welding base having a first accommodating cavity recessed from the surface thereof and a partition protruding from the surface thereof, a groove being formed on the partition, the groove being consistent with the filament pre-assembly position of the filament assembly; The ceramic assembly is clamped inside the first accommodating cavity of the filament welding tooling and positioned, the filament assembly contacts the upper surface of the welding base, the pins are spaced by the isolation part and the filament ends are placed in the groove to determine the assembly distance of the filament and the pin, and the pre-assembly of the filament assembly is completed.

8. The method of claim 5, wherein the method further comprises: In step S200, the concentricity of the filament is inspected by a filament inspection tooling; the filament inspection tooling has a calibration part with an opening, the opening is opposite to the densely wound part of the filament and coaxial with the focusing hole of the cathode focusing electrode, and the concentricity of the filament is inspected by verifying whether the center of the densely wound part is concentric with the center of the opening.

9. The method of claim 5, wherein, In step S300, the assembly of the cathode focusing electrode includes: a first compression ring is provided, the first compression ring has a through hole for accommodating the cathode focusing electrode and a stepped structure for clamping the cathode assembly; a sealing element is clamped inside the stepped structure of the first compression ring for positioning, then the cathode focusing electrode is assembled on the sealing element, and the filament assembly that has completed the concentricity detection is assembled on the cathode focusing electrode; a compression plate is provided, the compression plate is placed on the top of the cathode assembly, a second compression ring is provided, the second compression ring is sleeved outside the cathode assembly and the first compression ring to fix the cathode assembly, and the overall assembly of the X-ray tube cathode assembly is completed.

10. An X-ray tube, characterized by The X-ray tube includes a cathode assembly, and the cathode assembly is obtained by the X-ray tube cathode assembly assembly method in any one of claims 5-9.

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