X-ray tube, shaft bearing and spindle assembly

Abstract

The present application discloses an X-ray tube, a shaft-connected bearing and a mandrel device. The X-ray tube comprises: an anode target plate, a support and a shaft-connected bearing arranged between the anode target plate and the support, the shaft-connected bearing comprises: a mandrel device and a bearing mechanism arranged between the support and the mandrel device, wherein the mandrel device comprises: a connecting member, the front end of which is connected to the anode target plate; and a mandrel, which is sleeved on the connecting member from the rear side of the connecting member and is rotatably connected to the support through the bearing mechanism, and wherein at least one of a first surface of the connecting member opposite to the mandrel and a second surface of the mandrel opposite to the connecting member is provided with a heat-insulating coating.

Description

Technical Field

[0001] The present application relates to the technical field of X-ray tubes, and in particular to an X-ray tube, a shaft-connected bearing and a spindle device. Background Art

[0002] The shaft-connected bearing is a common bearing support form for ordinary rotating anode X-ray tubes. It simplifies the double-support ball bearing and opens the inner grooves of the front and rear support bearings on the same shaft to improve the bearing assembly accuracy, performance and service life.

[0003] In a rotating anode X-ray tube, the shaft-connected bearing can be divided into a front bearing and a rear bearing according to the distance between the supporting bearing and the anode target disk. When the X-ray tube is working, the temperature load of the bearing mainly comes from the heat transfer from the target disk. Since the front bearing is closer to the target disk, it bears a temperature load of nearly 500 degrees, which is much higher than the rear bearing. Excessive temperature load leads to reduced strength of the front bearing, premature cracking and deterioration of the solid lubricant on its surface, which ultimately affects the service life of the bearing and causes the bearing to fail prematurely. By decomposing the faulty X-ray tube, it was found that the failure and jamming of the front bearing is one of the main causes of X-ray tube bearing failure.

[0004] With regard to the technical problem in the prior art that the front bearing of the existing shaft-connected bearing arranged in the rotating anode X-ray tube, which is close to the anode target plate, withstands a temperature much higher than that of the rear bearing, so that the front bearing fails prematurely compared with the rear bearing, thus seriously shortening the service life of the X-ray tube, no effective solution has been proposed so far. Summary of the invention

[0005] The present disclosure provides an X-ray tube, a shaft-connecting bearing and a spindle device, so as to at least solve the technical problem in the prior art that a front bearing of an existing shaft-connecting bearing arranged in a rotating anode X-ray tube and close to an anode target plate withstands a temperature much higher than that of a rear bearing, so that the front bearing fails prematurely compared with the rear bearing, thereby seriously shortening the service life of the X-ray tube.

[0006] According to one aspect of the present application, an X-ray tube is provided, comprising: an anode target plate, a support, and a shaft-connected bearing arranged between the anode target plate and the support, the shaft-connected bearing comprising: a core shaft device and a bearing mechanism arranged between the support and the core shaft device, wherein the core shaft device comprises: a connecting member, the front end of the connecting member is connected to the anode target plate; and a core shaft, the core shaft is sleeved on the connecting member from the rear side of the connecting member and is rotatably connected to the support through the bearing mechanism, and wherein a thermal insulation coating is provided on at least one of a first surface of the connecting member opposite to the core shaft and a second surface of the core shaft opposite to the connecting member.

[0007] According to another aspect of the present application, a shaft-connected bearing is provided, comprising: a spindle device and a bearing mechanism arranged between a support and the spindle device, wherein the spindle device comprises: a connecting member, a front end of the connecting member is connected to the anode target plate; and a spindle, the spindle is sleeved on the connecting member from the rear side of the connecting member and is rotatably connected to the support through the bearing mechanism, and wherein a thermal insulation coating is provided on at least one of a first surface of the connecting member opposite to the spindle and a second surface of the spindle opposite to the connecting member.

[0008] According to another aspect of the present application, a core shaft device is provided, comprising: a connecting member, a front end of which is connected to an anode target plate; and a core shaft, which is sleeved on the connecting member from a rear side thereof and rotatably connected to a support via a bearing mechanism, and wherein a thermal insulation coating is provided on at least one of a first surface of the connecting member opposite to the core shaft and a second surface of the core shaft opposite to the connecting member.

[0009] Therefore, according to an X-ray tube provided in an embodiment of the present application, a ceramic heat-insulating coating is provided on any one surface of the connection between the connector of the mandrel device connected to the anode target disk and the mandrel. Therefore, when the heat of the anode target disk is transferred to the mandrel device, the ceramic heat-insulating coating can prevent the heat from being directly transferred to the ball, and increase the path of heat conduction, thereby reducing the temperature on a longer heat conduction path. Therefore, the technical effect of avoiding the front bearing from being subjected to excessive temperature load and increasing the service life of the X-ray tube is achieved. This further solves the technical problem in the prior art that the front bearing of the existing shaft-connected bearing arranged in the rotating anode X-ray tube, which is close to the anode target disk, will fail prematurely compared to the rear bearing due to the temperature it is subjected to being much higher than the rear bearing, thereby seriously shortening the service life of the X-ray tube.

[0010] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0012] Figure 1 is a schematic diagram of an X-ray tube according to the first aspect of an embodiment of the present application;

[0013] Figure 2 yes Figure 1 A schematic diagram of the connector shown;

[0014] Figure 3 yes Figure 1 A schematic diagram of the mandrel shown;

[0015] Figure 4 yes Figure 1 Another schematic diagram of the connector shown;

[0016] Figure 5 yes Figure 1 Another schematic diagram of the mandrel shown;

[0017] Figure 6 yes Figure 1 A schematic diagram of a shaft-connected bearing is shown; and

[0018] Figure 7 It is a schematic diagram of the heat flow in the connecting member according to the first aspect of the embodiment of the present application. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to enable those skilled in the art to better understand the scheme of the present disclosure, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present disclosure.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Figure 1 Schematic diagram of an X-ray tube according to the first aspect of the embodiment of the present application. Figure 1 As shown, the X-ray tube comprises: an anode target plate 10, a support 20 and a shaft-connected bearing 30 arranged between the anode target plate 10 and the support 20, the shaft-connected bearing 30 comprises: a spindle device 310 and a bearing mechanism 320 arranged between the support 20 and the spindle device 310, wherein the spindle device 310 comprises: a connecting member 311, the front end of the connecting member 311 is connected to the anode target plate 10; and a spindle 312, the spindle 312 is sleeved on the connecting member 311 from the rear side of the connecting member 311, and is rotatably connected to the support 20 through the bearing mechanism 320, and wherein a thermal insulation coating 313 is arranged on at least one of a first surface 3111 of the connecting member 311 opposite to the spindle 312 and a second surface 3121 of the spindle 312 opposite to the connecting member 311.

[0024] As mentioned in the background technology, in a rotating anode X-ray tube, the shaft-connected bearing can be divided into a front bearing and a rear bearing according to the distance between the supporting bearing and the anode target disk. When the X-ray tube is working, the temperature load of the bearing mainly comes from the heat transfer from the target disk. Since the front bearing is closer to the target disk, it bears a temperature load of nearly 500 degrees, which is much higher than the rear bearing. Excessive temperature load leads to reduced strength of the front bearing, premature cracking and deterioration of the solid lubricant on its surface, and ultimately affects the service life of the bearing and causes the bearing to fail prematurely. By decomposing the failed X-ray tube, it was found that the failure and jamming of the front bearing was one of the main causes of X-ray tube bearing failure.

[0025] In view of this, the embodiment of the present application provides an X-ray tube (which may be a rotating anode X-ray tube), and a heat-insulating coating 313 is provided on any corresponding surface of the connecting piece 311 and the mandrel 312 of the mandrel device 310 connected to the anode target disk 10. Therefore, when the heat of the anode target disk 10 is transferred to the mandrel device 310, the heat-insulating coating 313 increases the path of heat conduction, reduces the temperature on the longer heat conduction path, and prevents the heat from being directly transferred to the ball of the bearing mechanism 320. Therefore, it is avoided that the front bearing of the bearing mechanism 320 is subjected to excessive temperature load, and the technical effect of increasing the service life of the X-ray tube is achieved. In addition, it solves the technical problem in the prior art that the front bearing of the existing shaft-connected bearing arranged in the rotating anode X-ray tube, which is close to the anode target disk, will fail prematurely compared with the rear bearing due to the temperature being much higher than the rear bearing, which seriously shortens the service life of the X-ray tube.

[0026] In addition, reference Figure 1 As shown, the connecting member 311 is not limited to being directly connected to the anode target disk 10 , wherein the connecting member 311 can be connected to the anode target disk 10 via a transfer rod 40 .

[0027] In addition, according to the diameter of the connector 311 and the heat insulation effect, the thickness of the heat insulation coating 313 can be 250-650 um. When the heat insulation coating 313 of this thickness is used in a high temperature environment, no gas will be generated. And the surface roughness of the heat insulation coating 313 is less than Ra1.6.

[0028] Optionally, refer to Figure 2 As shown, the front end of the mandrel 312 is provided with a first mounting hole 3122, and the connector 311 includes a connecting rod 3112 disposed in the first mounting hole 3122, wherein the first surface 3111 includes an outer surface 31111 of the connecting rod 3112, and the second surface 3121 includes an inner surface 31211 of the first mounting hole 3122. Thus, a heat-insulating coating 313 can be provided on the first surface 3111 or the second surface 3121 of the connector 311 and the mandrel 312 relative to each other. After the heat of the anode target 10 is transferred to the connector 311, the heat-insulating coating 313 can increase the length of the heat conduction path and prevent the heat from being directly transferred to the ball of the bearing mechanism 320. This prevents the front bearing from being subjected to excessive temperature load, thereby achieving the technical effect of increasing the service life of the X-ray tube. In addition, the heat can be transferred to the rear side through the connecting rod 3111 of the connector 311, and the heat will gradually decrease during the process of heat transfer to the rear.

[0029] Optionally, refer to Figures 2 to 5As shown, the rear end of the connecting rod 3112 is provided with an external thread 31121, and the first mounting hole 3122 is provided with an internal thread 31221 corresponding to the external thread 31121. Thus, the connecting rod 3112 of the connecting member 311 and the first mounting hole 3122 of the mandrel 312 can be fixedly connected through the external thread 31121 and the internal thread 31221.

[0030] Optionally, refer to Figure 2 and Figure 3 As shown, the rear end of the connecting rod 3112 is connected to the rear end of the first mounting hole 3122 by brazing. The connecting rod 3112 and the first mounting hole 3122 are fixedly connected by the external thread 31121 and the internal thread 31221. However, in order to prevent the thread from loosening, after the connecting rod 3112 and the first mounting hole 3122 are connected by threads, the rear end of the connecting rod 3112 is brazed with the rear end of the first mounting hole 3122. Thus, the technical effect of the connecting rod 3112 and the first mounting hole 3122 being firmly connected is achieved.

[0031] Optionally, refer to Figure 2 and Figure 3 As shown, the connector 311 also includes a first flange portion 3113 disposed at the front end of the connecting rod 3112 and connected to the anode target disk 10, and the front end of the mandrel 312 is provided with a second flange portion 3123 opposite to the first flange portion 3113, wherein the first surface 3111 includes a third surface 31112 where the first flange portion 3113 and the second flange portion 3123 are opposite, and the second surface 3121 includes a fourth surface 31212 where the second flange portion 3123 and the first flange portion 3113 are opposite. Thus, a heat-insulating coating 313 can be provided on the first surface 3111 or the second surface 3121 where the connector 311 and the mandrel 312 are opposite. After the heat of the anode target disk 10 is transferred to the connector 311, the heat-insulating coating 313 can increase the length of the heat conduction path and prevent the heat from being directly transferred to the ball of the bearing mechanism 320. The front bearing is prevented from being subjected to excessive temperature load, thereby achieving the technical effect of increasing the service life of the X-ray tube.

[0032] Optionally, refer to Figure 2 and Figure 3As shown, a first boss 31131 is provided on the periphery of the side opposite to the second flange 3123 of the first flange 3113, and a second boss 31231 corresponding to the first boss 31131 is provided on the periphery of the side opposite to the first flange 3113 of the second flange 3123, wherein the first boss 31131 and the second boss 31231 are connected by welding. The first boss 31131 and the second boss 31231 are provided at the external connection between the first flange 3113 of the connector 311 and the second flange 3123 of the mandrel 312, and are fixedly connected by welding. The technical effect of a stable connection between the connector 311 and the mandrel 312 is achieved.

[0033] Optionally, the bearing mechanism 320 includes: a first bearing 321 disposed adjacent to the front end of the mandrel device 310 and a second bearing 322 disposed adjacent to the rear end of the mandrel device 310, and the first bearing 321 and the second bearing 322 are fixed in a second mounting hole 210 disposed in the support 20. Relative rotation between the mandrel device 310 and the bearing mechanism 320 is achieved through the first bearing 321 and the second bearing 322. In addition, the support 20 is provided with a second mounting hole 210, so that the support 20 can be nested on the bearing mechanism 320 from the rear side.

[0034] Optionally, refer to Figure 6 As shown, the bearing mechanism 320 further includes: a sleeve 323, which is arranged between the first bearing 321 and the second bearing 322; and a C-shaped snap ring 324, which is arranged between the second bearing 322 and the sleeve 323 or between the first bearing 321 and the sleeve 323. The sleeve 323 is arranged between the first bearing 321 and the second bearing 322, but since the length of the sleeve 323 is pre-set, after the first bearing 321, the sleeve 323 and the second bearing 322 of the bearing mechanism 320 are installed, there is a gap between the sleeve 323 and the first bearing 321 and the second bearing 322. Therefore, an appropriate C-shaped snap ring 324 is added between the second bearing 322 and the sleeve 323 or between the first bearing 321 and the sleeve 323, so that the bearing mechanisms 320 are tightly connected to avoid affecting the use of the shaft-connected bearing 30.

[0035] In addition, the C-shaped snap ring 324 is added according to the size of the gap between the sleeve 323 and the first bearing 321 and the second bearing 322 . After adding the C-shaped snap ring 324 , the sleeve 323 and the first bearing 321 and the second bearing 322 are tightly connected.

[0036] In addition, reference Figure 5As shown, the first bearing 321 can be disposed at the front first groove 3124 of the outer surface of the core shaft 312, and the second bearing 322 can be disposed at the rear second groove 3125 of the outer surface of the core shaft 312. Thus, the balls of the first bearing 321 and the second bearing 322 can rotate along the first groove 3124 and the second groove 3125.

[0037] Optionally, refer to Figure 1 and Figure 6 As shown, the rear end of the connecting rod 3112 is nested and connected with the rear end of the first mounting hole 3122 by interference fit. The outer diameter of the connecting rod 3112 and the inner diameter of the mandrel 312 are the dimensions after the thickness of the heat insulation coating 313 is included, and the outer diameter of the connecting rod 3112 is slightly larger than the inner diameter of the mandrel 312. Therefore, under high temperature conditions, the outer diameter of the connecting rod 3112 and the inner diameter of the mandrel 312 are interference fit, wherein the interference amount is 0-0.02mm.

[0038] Optionally, refer to Figure 7 As shown, the heat-insulating coating 313 is a ceramic heat-insulating coating, wherein the ceramic heat-insulating coating can be an ultra-thin ceramic heat-insulating coating, thereby achieving the technical effect of preventing heat transfer.

[0039] In addition, reference Figure 7 As shown in the figure, the arrow indicates the transfer direction of the heat transferred from the anode target disc 10 to the connecting member 311. Due to the presence of the thermal insulation coating, the heat conduction path is increased, and the temperature load of the first bearing 321 (front bearing) will be significantly reduced. Therefore, by providing the thermal insulation coating 323, heat is prevented from being directly transferred to the first bearing 321 through the connecting member 311, thereby avoiding the shortening of the service life of the first bearing 321.

[0040] In addition, a second aspect of the present embodiment provides a shaft-connected bearing 30, which includes: a core shaft device 310 and a bearing mechanism 320 arranged between the support 20 and the core shaft device 310, wherein the core shaft device 310 includes: a connecting member 311, the front end of which is connected to the anode target plate 10; and a core shaft 312, which is sleeved on the connecting member 311 from the rear side of the connecting member 311 and is rotatably connected to the support 20 through the bearing mechanism 320, and wherein a thermal insulation coating 313 is provided on at least one of a first surface 3111 of the connecting member 311 opposite to the core shaft 312 and a second surface 3121 of the core shaft 312 opposite to the connecting member 311.

[0041] Specifically, the description of the shaft-connecting bearing 30 refers to the contents described in the first aspect of the embodiment of the present application, and will not be repeated here.

[0042] In addition, a third aspect of the present embodiment provides a mandrel device 310, comprising: a connecting member 311, a front end of which is connected to the anode target plate 10; and a mandrel 312, the mandrel 312 is sleeved on the connecting member 311 from the rear side thereof, and is rotatably connected to the support 20 via a bearing mechanism 320, and wherein a thermal insulation coating 313 is provided on at least one of a first surface 3111 of the connecting member 311 opposite to the mandrel 312 and a second surface 3121 of the mandrel 312 opposite to the connecting member 311.

[0043] Specifically, the description of the core shaft device 310 refers to the contents described in the first aspect of the embodiment of the present application, and will not be repeated here.

[0044] Thus, according to an X-ray tube provided in an embodiment of the present application, a heat-insulating coating 313 is provided on any one surface of the connection between the connector 311 and the mandrel 312 of the mandrel device 310 connected to the anode target disk 10. Thus, when the heat of the anode target disk 10 is transferred to the mandrel 320 structure, the heat-insulating coating 313 can prevent the heat from being directly transferred to the ball 330, and increase the path of heat conduction, so that the temperature is reduced on a longer heat conduction path. Therefore, the technical effect of avoiding the front bearing from being subjected to excessive temperature load and increasing the service life of the X-ray tube is achieved. This solves the technical problem in the prior art that the front bearing of the existing shaft-connected bearing arranged in the rotating anode X-ray tube, which is close to the anode target disk, will fail prematurely compared with the rear bearing due to the temperature it bears being much higher than the rear bearing, thus seriously shortening the service life of the X-ray tube.

[0045] In addition, the left and right ends of the connector 311 and the mandrel 312 are connected by welding and threading, and the middle part is connected by interference fit, which significantly improves the strength of the entire assembly. In this way, the temperature load of the first bearing 321 (front bearing) can be reduced and the service life of the X-ray tube can be increased while taking into account the connection strength of the entire X-ray tube assembly and the structural strength of the shaft-connecting bearing 30.

[0046] In addition, the present invention improves the mandrel device 310 of the shaft-connected bearing 30, and divides the traditional mandrel device 310 into two parts: a connector 311 and a mandrel 312. Heat-insulating coatings are applied to the contact surfaces of the connector 311 and the mandrel 312, respectively. The left and right ends of the connector 311 and the mandrel 312 are connected by welding and threading, and the middle part is connected by interference fit. In this way, the temperature load of the first bearing 321 can be significantly reduced without affecting the structural strength of the X-ray tube and the parts of the shaft-connected bearing 30. It has a good effect on reducing the failure rate of the front bearing of the X-ray tube, extending the failure time of the front bearing, and further improving the service life of the first bearing 321 and the X-ray tube.

[0047] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0050] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An X-ray tube, comprising: An anode target plate (10), a support (20), and a shaft-connected bearing (30) disposed between the anode target plate (10) and the support (20), characterized in that the shaft-connected bearing (30) comprises: a spindle device (310) and a bearing mechanism (320) disposed between the support (20) and the spindle device (310), wherein The mandrel device (310) comprises: a connecting member (311), the front end of which is connected to the anode target plate (10); and a mandrel (312), which is sleeved on the connecting member (311) from the rear side of the connecting member (311) and is rotatably connected to the support (20) via the bearing mechanism (320), and wherein: A thermal insulation coating (313) is provided on at least one of a first surface (3111) of the connecting member (311) opposite to the core shaft (312) and a second surface (3121) of the core shaft (312) opposite to the connecting member (311), wherein the thickness of the thermal insulation coating (313) is 250 to 650 μm.

2. The X-ray tube according to claim 1, characterized in that The front end of the core shaft (312) is provided with a first mounting hole (3122), and the connecting member (311) comprises a connecting rod (3112) arranged in the first mounting hole (3122), wherein The first surface (3111) includes an outer surface (31111) of the connecting rod (3112), and the second surface (3121) includes an inner surface (31211) of the first mounting hole (3122).

3. The X-ray tube according to claim 2, characterized in that The rear end of the connecting rod (3112) is provided with an external thread (31121), and the first mounting hole (3122) is provided with an internal thread (31221) corresponding to the external thread (31121); and The rear end of the connecting rod (3112) is connected to the rear end of the first mounting hole (3122) by brazing.

4. The X-ray tube according to claim 2, characterized in that The connecting member (311) further comprises a first flange portion (3113) arranged at the front end of the connecting rod (3112) and connected to the anode target plate (10), and the front end of the mandrel (312) is provided with a second flange portion (3123) opposite to the first flange portion (3113), wherein The first surface (3111) includes a third surface (31112) where the first flange portion (3113) is opposite to the second flange portion (3123), and the second surface (3121) includes a fourth surface (31212) where the second flange portion (3123) is opposite to the first flange portion (3113).

5. The X-ray tube according to claim 4, characterized in that A first boss (31131) is provided on the periphery of the side of the first flange portion (3113) opposite to the second flange portion (3123), and a second boss (31231) corresponding to the first boss (31131) is provided on the periphery of the side of the second flange portion (3123) opposite to the first flange portion (3113), wherein The first boss (31131) and the second boss (31231) are connected by welding.

6. The X-ray tube according to claim 1, characterized in that The bearing mechanism (320) comprises: a first bearing (321) disposed adjacent to the front end of the spindle device (310) and a second bearing (322) disposed adjacent to the rear end of the spindle device (310), and The first bearing (321) and the second bearing (322) are fixed in a second mounting hole (210) provided in the support (20).

7. The X-ray tube according to claim 6, characterized in that The bearing mechanism (320) further comprises: a shaft sleeve (323), disposed between the first bearing (321) and the second bearing (322); and A C-shaped retaining ring (324) is arranged between the second bearing (322) and the shaft sleeve (323) or between the first bearing (321) and the shaft sleeve (323).

8. The X-ray tube according to claim 2, characterized in that The rear end of the connecting rod (3112) and the rear end of the first mounting hole (3122) are nested and connected by interference fit; or The thermal insulation coating (313) is a ceramic thermal insulation coating.

9. A shaft-connected bearing (30), characterized in that: include: A spindle device (310) and a bearing mechanism (320) arranged between a support (20) and the spindle device (310), wherein The mandrel device (310) comprises: a connecting member (311), the front end of which is connected to the anode target plate (10); and a mandrel (312), which is sleeved on the connecting member (311) from the rear side of the connecting member (311) and is rotatably connected to the support (20) via the bearing mechanism (320), and wherein: A thermal insulation coating (313) is provided on at least one of a first surface (3111) of the connecting member (311) opposite to the core shaft (312) and a second surface (3121) of the core shaft (312) opposite to the connecting member (311), wherein the thickness of the thermal insulation coating (313) is 250 to 650 μm.

10. A spindle device (310), characterized in that: include: A connecting member (311), the front end of which is connected to the anode target plate (10); and a mandrel (312), which is sleeved on the connecting member (311) from the rear side of the connecting member (311) and is rotatably connected to the support (20) via a bearing mechanism (320), and wherein: A thermal insulation coating (313) is provided on at least one of a first surface (3111) of the connecting member (311) opposite to the core shaft (312) and a second surface (3121) of the core shaft (312) opposite to the connecting member (311), wherein the thickness of the thermal insulation coating (313) is 250 to 650 μm.

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