CN115472476A - Dynamic balance correction method and system for anode assembly of X-ray tube liquid metal bearing - Google Patents

Abstract

The application discloses a dynamic balance correction method and system for an anode assembly of a liquid metal bearing of an X-ray tube. The method comprises the following steps: providing a process device for performing a dynamic balance test on an anode assembly of an X-ray tube, wherein the anode assembly is an anode assembly rotating based on a liquid metal bearing, and the process device comprises a mandrel and a rolling bearing sleeved on the mandrel; assembling the anode assembly to the process device such that the anode assembly is rotatable relative to the mandrel supported by the rolling bearing; fixing the mandrel, and carrying out dynamic balance test on the anode assembly; and carrying out dynamic balance correction on the anode assembly according to the result of the dynamic balance test.

Description

Dynamic balance correction method and system for anode assembly of X-ray tube liquid metal bearing

Technical Field

The application relates to the technical field of X-ray tubes, in particular to a dynamic balance correction method and a test system for an anode assembly of a liquid metal bearing of an X-ray tube.

Background

The anode assembly is a core rotating component inside the X-ray tube, and referring to fig. 1, the anode assembly 210 generally includes parts such as an anode target disk 211, an adapter rod 212, a rotating outer sleeve 213, and a rotating flange 214, which are fixed together by screws 215 or welding. In addition, for heat dissipation, a heat dissipation metal sleeve 217 is further arranged outside the rotating outer sleeve 213; and the rotating flange 214 is provided with a reservoir 216 that prevents liquid metal from leaking. Under the working state of the X-ray tube, the rotating speed of the anode assembly reaches 9000r/min, and some anode assemblies even reach 12000r/min.

Due to uneven material quality of parts, deviation of machining precision, deviation of assembling of rotating assemblies and the like, the mass of the anode assembly is eccentric. When the anode assembly is rotated at high speed, the mass eccentricity produces a periodic centrifugal force excitation and acts on the bearings, eventually causing the X-ray tube to vibrate. In order to ensure the safe and reliable operation of the X-ray tube, the mass eccentricity of the anode assembly must be reduced as much as possible to make the vibration value of the X-ray tube in the operating state meet the use requirements. Dynamic balance correction is therefore an important process in the production of X-ray tubes as a primary means of reducing mass eccentricity of the entire anode assembly. Specifically, the dynamic balance correction first performs a vibration test on the anode assembly to determine the angle and weight of mass eccentricity of the anode assembly, and then performs de-weighting at the corresponding position of the anode assembly, thereby reducing the mass eccentricity of the anode assembly.

Typically, the anode assembly is mounted to the X-ray tube by a liquid metal bearing. Fig. 2 shows a schematic view of a dynamic balance correction apparatus for performing dynamic balance correction on an anode assembly. Referring to fig. 2, before performing dynamic balance correction, the anode assembly 210 is first assembled with the bearing core 220, and filled with liquid metal 230 to form a liquid metal bearing; then, fixing the bearing core 220 on the dynamic balance test platform 311, driving the anode assembly 210 to repeatedly start and stop by using the coil 312, and performing vibration test by using the rotating speed sensor 313 and the vibration sensor 314; the dynamic balance correction of the anode assembly 210 is completed through multiple times of de-weighting.

However, the prior art has the following problems when the anode assembly is subjected to dynamic balance correction:

1) In order to reduce the mass eccentricity of the anode assembly to a qualified range, multiple times of counterweight and repeated start and stop are needed in dynamic balance correction. Because during dynamic balance correction, liquid metal is filled into the bearing, and the surface of the liquid metal bearing is abraded when the liquid metal bearing is started and stopped for a plurality of times during dynamic balance correction, so that the service life of the liquid metal bearing is shortened.

2) Under the condition that the initial vibration of the anode assembly is overlarge, the liquid metal bearing is directly started to carry out the dynamic balance correction of the anode assembly, and the liquid metal bearing is easy to be blocked.

3) During the dynamic balance correction process, liquid metal is easy to leak from the bearing gap into a liquid storage tank of a rotating flange of the anode assembly, and the leaked liquid metal is used as an additional mass to cause the eccentric position of the dynamic balance correction mass to deviate from the actual position. Therefore, the process of dynamic balance correction needs to be repeatedly balanced and started and stopped, so that the efficiency of dynamic balance correction is reduced, and the bearing abrasion is further worsened.

In view of the above technical problems of inefficiency and easy damage to the liquid metal bearing in the course of performing dynamic balance correction on the anode assembly based on the liquid metal bearing, no effective solution has been proposed at present.

Disclosure of Invention

The present disclosure provides a dynamic balance correction method and a test system for an anode assembly of a liquid metal bearing of an X-ray tube, in order to at least solve the technical problems of low efficiency and easy damage to the liquid metal bearing in the process of performing dynamic balance correction on the anode assembly of the liquid metal bearing.

According to one aspect of the present application, there is provided a method of dynamic balance correction of an X-ray tube liquid metal bearing anode assembly, comprising: providing a process device for performing a dynamic balance test on an anode assembly of an X-ray tube, wherein the anode assembly is an anode assembly rotating based on a liquid metal bearing, and the process device comprises a mandrel and a rolling bearing sleeved on the mandrel; assembling the anode assembly to the process device such that the anode assembly is rotatable relative to the mandrel supported by the rolling bearing; fixing the mandrel, and carrying out dynamic balance test on the anode assembly; and carrying out dynamic balance correction on the anode assembly according to the result of the dynamic balance test.

According to another aspect of the present application, there is provided a dynamic balance testing system for an X-ray tube liquid metal bearing anode assembly, wherein the anode assembly is a liquid metal bearing rotation based anode assembly. The system comprises: the process device is used for carrying out dynamic balance test on the anode assembly, and comprises a mandrel and a rolling bearing sleeved on the mandrel; the dynamic balance test platform is used for fixing a mandrel of the process device; the coil is used for driving the anode assembly to rotate under the condition that the anode assembly is sleeved on the process device; a rotation speed sensor for detecting a rotation speed of the anode assembly; and the vibration sensor is arranged on the dynamic balance test platform and used for detecting the vibration of the anode assembly under the condition that the anode assembly rotates.

Accordingly, the technical solution of the present disclosure provides a process device provided with a rolling bearing, so that an anode assembly is assembled with the process device and dynamic balance correction is performed before the anode assembly is assembled to form a liquid metal bearing. Damage to the liquid metal bearing during dynamic balance correction of the anode assembly is thus avoided. And the situation that the dynamic balance correction process is low in efficiency due to liquid metal leakage in the dynamic balance correction process is avoided. Therefore, the technical problems that the efficiency is low and the liquid metal bearing is easy to damage in the process of performing dynamic balance correction on the anode assembly based on the liquid metal bearing are solved.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

figure 1 shows a schematic view of an anode assembly for an X-ray tube based on a liquid metal bearing;

FIG. 2 shows a schematic diagram of a prior art dynamic balance test for an anode assembly based on a liquid metal bearing;

fig. 3 shows a flow diagram of a method of dynamic balance correction of an anode assembly of an X-ray tube according to an embodiment of the present disclosure;

FIG. 4 illustrates a process arrangement for dynamic balance testing of an anode assembly according to an embodiment of the present disclosure;

FIG. 5 shows a schematic view of the anode assembly in a state assembled to the process device;

FIG. 6 illustrates a schematic diagram of a dynamic balance test on a liquid metal bearing based anode assembly according to an embodiment of the present disclosure;

FIG. 7 shows a schematic view of an anode assembly being filled with liquid metal and assembled with a bearing core to form a liquid metal bearing; and

fig. 8 shows a schematic view of an anode assembly assembled to an X-ray tube according to an embodiment of the present disclosure.

Detailed Description

It should be noted that, in the present disclosure, the embodiments and the features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts shall fall within the protection scope of the present disclosure.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing the embodiments of the disclosure herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

According to a first aspect of embodiments of the present disclosure, a method for dynamic balance correction of an anode assembly of an X-ray tube liquid metal bearing is provided, wherein fig. 3 shows a flow diagram of the method. Referring to fig. 3, the method includes:

s302: providing a process device for performing a dynamic balance test on an anode assembly of an X-ray tube, wherein the process device comprises a mandrel and a rolling bearing sleeved on the mandrel;

s304: assembling the anode assembly to the process device such that the anode assembly is rotatable relative to the mandrel supported by the rolling bearing;

s306: fixing the mandrel, and carrying out dynamic balance test on the anode assembly; and

s308: and according to the result of the dynamic balance test, performing dynamic balance correction on the anode assembly.

Specifically, referring to FIG. 4, to perform a dynamic balance correction on the anode assembly 210 shown in FIG. 1, the present disclosure provides a process device 240 for performing a dynamic balance test on the anode assembly 210. Referring to fig. 4, the process apparatus 240 includes: a mandrel 241 and rolling bearings 243a and 243b sleeved on the mandrel 241 (S302).

Then, referring to fig. 5, the anode assembly 210 is assembled to the process device 240 such that the anode assembly 210 can rotate with respect to the mandrel 241 of the process device 240 while being supported by the rolling bearings 243a and 243b of the process device 240 (S304).

Then, referring to fig. 6, the mandrel 241 is fixed on the dynamic balance test stage 311, the anode assembly 210 is driven to rotate by the coil 312, and then a dynamic balance test is performed by the rotation speed sensor 313 and the vibration sensor 314 during the rotation of the anode assembly 210 (S306).

Then, the anode assembly 210 is deduplicated a plurality of times according to the result of the dynamic balance test of the anode assembly 210, thereby completing the dynamic balance correction of the anode assembly 210 (S308).

As described in the background, the anode assembly is typically mounted to the X-ray tube by a liquid metal bearing. Therefore, the prior art has the following problems when the anode assembly is subjected to dynamic balance correction:

1) In order to reduce the mass eccentricity of the anode assembly to a qualified range, multiple times of counterweight and repeated start and stop are required in dynamic balance correction. Because during dynamic balance correction, liquid metal is filled into the bearing, and the surface of the liquid metal bearing is abraded when the liquid metal bearing is started and stopped for a plurality of times during dynamic balance correction, so that the service life of the liquid metal bearing is shortened.

2) Under the condition that the initial vibration of the anode assembly is overlarge, the liquid metal bearing is directly started to carry out the dynamic balance correction of the anode assembly, and the liquid metal bearing is easy to be blocked.

3) During the dynamic balance correction process, liquid metal is easy to leak from the bearing gap into a liquid storage tank of a rotating flange of the anode assembly, and the leaked liquid metal can be used as an additional mass to cause the eccentric position of the dynamic balance correction mass to deviate from the actual position. Therefore, the process of dynamic balance correction needs to be repeatedly started and stopped by balancing weights for many times, so that the efficiency of dynamic balance correction is reduced, and the bearing abrasion is further aggravated.

In view of the above, the technical solution of the present disclosure provides a process device provided with a rolling bearing, so that an anode assembly is assembled with the process device and a dynamic balance correction is performed before the anode assembly is assembled to form a liquid metal bearing. Damage to the liquid metal bearing during dynamic balance correction of the anode assembly is thus avoided. And the situation that the dynamic balance correction process is low in efficiency due to liquid metal leakage in the dynamic balance correction process is avoided. Therefore, the technical problems that the efficiency is low and the liquid metal bearing is easy to damage in the process of performing dynamic balance correction on the anode assembly based on the liquid metal bearing are solved.

Alternatively, referring to fig. 4, the processing device 240 further includes shaft sleeves 242a, 242b sleeved on the spindle 241, and the rolling bearings 243a, 243b include a first rolling bearing 243a and a second rolling bearing 243b, wherein the shaft sleeves 242a, 242b are disposed between the first rolling bearing 243a and the second rolling bearing 243 b.

Thus, the technical solution of the present disclosure may adjust the distance between the first rolling bearing 243a and the second rolling bearing 243b through the shaft sleeve 242a and the shaft sleeve 242b. In this way, the process device 240 is thus adapted to different lengths of the rotating outer casing 213 of different sizes of anode assemblies 210. And preferably, the process device 240 of the present disclosure includes a first sleeve 242a and a second sleeve 242b. Wherein the second sleeve 242b has a reference length and the first sleeve 242a has a shorter length than the second sleeve 242b. Therefore, by replacing the first shaft sleeve 242a with a different length, the distance between the first rolling bearing 243a and the second rolling bearing 243b can be adjusted, thereby saving the manufacturing cost of the process device 240.

Further, the first rolling bearing 243a and the second rolling bearing 243b are preferably angular contact bearings. The first rolling bearing 243a and the second rolling bearing 243b are rated P2, and the bearing lubrication method is grease lubrication. The common load-bearing capacity of the first and second rolling bearings 243a, 243b is greater than the weight of the anode assembly 210, and the first and second rolling bearings 243a, 243b support a rotational speed higher than the operating rotational speed of the anode assembly 210.

Further, the outer diameters of the first and second sleeves 242a and 242b are slightly smaller than the outer diameters of the first and second rolling bearings 243a and 243b by 0.05 to 0.1mm.

Furthermore, the first rolling bearing 243a and the second rolling bearing 243b may also be rigidly preloaded in the axial direction.

In the processing apparatus 240, the runout and the runout of the first rolling bearing 243a and the second rolling bearing 243b are controlled to be within 0.01mm with respect to the axis of the mandrel 241.

Alternatively, referring to fig. 1, the anode assembly 210 includes an anode target disk 211, a rotating outer sleeve 213 connected to the anode target disk 211, and a rotating flange 214 connected to the rotating outer sleeve 213. And with reference to fig. 5, the assembly of anode assembly 210 to process device 240 includes: the rotating outer sleeve 213 is sleeved outside the first rolling bearing 243a and the second rolling bearing 243b from the front end of the process device 240, and the inner hole of the rotating outer sleeve 213 is radially positioned through the first rolling bearing 243a and the second rolling bearing 243b; a spring 244 is fitted from the rear end of the spindle 241, and the spring 244 is abutted against the rear end of the second rolling bearing 243b; and sleeving the rotating flange 214 on the mandrel 241 from the rear side of the mandrel 241, and connecting and fixing the rotating flange 214 to the rear end of the rotating outer sleeve 213, wherein the rotating flange 214 applies an axial preload to the second rolling bearing 243b by the spring 244.

The solution of the present disclosure thus applies an axial preload between the anode assembly 210 and the process device 240 through the spring 244, thereby maintaining stability between the anode assembly 210 and the process device 240 and preventing the anode assembly 210 from moving.

Further alternatively, the outer diameters of the rolling bearings 243a and 243b of the process device 240 are fit-machined with the inner bore of the rotating outer casing 213 of the anode assembly 210, thereby achieving a small clearance fit after assembly. In the case where the inner bore of the rotating outer sleeve 213 of the anode assembly 210 has a diameter of 20 to 40mm, the fitting clearance between the outer diameters of the rolling bearings 243a and 243b and the inner bore of the rotating outer sleeve 213 is 0.02 to 0.03mm. In this way, the outer sleeve 213 can thus be positioned with the outer diameter of the rolling bearings 243a and 243 b.

Optionally, the operation of performing a dynamic balance test on the anode assembly 210 includes: fixing the mandrel 241 and driving the anode assembly 210 to rotate; and detecting vibration of the anode assembly 210 during rotation of the anode assembly 210. And, according to the result of the dynamic balance test, the operation of performing dynamic balance correction on the anode assembly 210 includes: the anode assembly 210 is subjected to dynamic balance correction according to the vibration of the anode assembly 210 during rotation.

Specifically, referring to fig. 6, when the anode assembly 210 is subjected to the dynamic balance test, the anode assembly 210 is fixed to the dynamic balance test platform 311. The anode assembly 210 is then driven to rotate by the coil 312 and the anode assembly 210 is driven to an operating rotational speed (e.g., 7800 rpm). Then, vibration (e.g., vibration speed) of the anode assembly 210 is detected using the vibration sensor 314 during the rotation of the anode assembly 210. So that the anode assembly 210 can be dynamically balance-corrected according to the vibration of the anode assembly 210.

Optionally, the method further comprises: a second vibration velocity threshold of anode assembly 210 with assembly to process device 240 is determined based on the first vibration velocity threshold of anode assembly 210 with assembly to the liquid metal bearing. And, the operation of performing dynamic balance correction on the anode assembly 210 according to the vibration condition of the anode assembly 210 during rotation includes: detecting a vibration speed of the anode assembly 210 using the vibration sensor during the rotation of the anode assembly 210; and performing a deduplication operation on the anode assembly 210 in the case that the detected vibration speed is greater than the second vibration speed threshold.

Specifically, as the present disclosure introduces a new process unit 240 when performing dynamic balance correction of the anode assembly 210. In the case where the anode assembly 210 is assembled to the process device 240, the vibration speed of the anode assembly 210 may be different even at the same rotation speed, compared to the case where the liquid metal 230 is filled and the bearing core 220 is assembled to form the liquid metal bearing structure.

In order to correct the deviation of the vibration speed under the two conditions, the technical scheme of the disclosure selects 10 sets of anode assemblies of a certain model, and the following tests are respectively carried out:

firstly, after an anode assembly is assembled with a process device, performing dynamic balance correction according to the technical scheme of the disclosure, and obtaining the vibration speed of the anode assembly after the dynamic balance correction (namely the vibration speed of the anode assembly after the dynamic balance correction under the condition of assembling the process device);

and then assembling the bearing core on the anode assembly after the dynamic balance correction, filling liquid metal to form a liquid metal bearing, and then carrying out vibration test on the assembled anode assembly. Thus, test data of the anode assembly at the operating speed were obtained:

TABLE 1

Currently, the qualification criterion for the dynamic balance of the anode rotating assembly of the X-ray tube is that the vibration speed is less than 3mm/s (first vibration speed threshold).

Referring to Table 1, for the sake of clarity, the present disclosure controls the vibration speed of the anode assembly within the range of 0-1mm/s, 1-2mm/s, 2-3mm/s after assembling the process equipment with the anode assembly and performing the dynamic balance correction. The vibration speeds of 10 sets of anode assemblies after dynamic balance correction under the condition of assembling a process device are respectively 0.9mm/s, 0.5mm/s, 0.8mm/s, 1.5mm/s, 1.8mm/s, 1.7mm/s, 2.5mm/s, 2.6mm/s, 2.2mm/s and 2.8mm/s. Then, the process unit and the anode assembly are disassembled, and the bearing core, the liquid metal and the rotating outer sleeve of the anode assembly are assembled to form the liquid metal bearing structure. Then, the assembled anode assembly was subjected to a dynamic balance test at vibration speeds of 1.7mm/s, 1.1mm/s, 1.5mm/s, 2.0mm/s, 2.7mm/s, 2.3mm/s, 2.9mm/s, 3.3mm/s, 2.7mm/s, and 3.4mm/s, respectively.

From the above test data, it can be seen that the vibration speed tested after the anode assembly is assembled to form the liquid metal bearing is increased in a range of 0.4-0.9mm/s and the maximum value is not more than 1mm/s, relative to the vibration speed tested after the dynamic balance correction is performed on the assembly process device.

In addition, to accumulate more data, the present disclosure again performs dynamic balance correction and vibration testing in the same manner as described above for another 10 sets of anode assemblies of that model. During the test, the anode assembly under the condition of assembling the process device is subjected to dynamic balance correction, the vibration speed of the anode assembly is controlled within the ranges of 0-1mm/s, 1-2mm/s and 2-3mm/s, and the vibration value is closer to the upper limit of the interval. Thus obtaining test data of the anode assembly at the working rotating speed:

TABLE 2

From the above test data, it can be seen that:

as the present disclosure introduces a new process unit 240 when performing dynamic balance correction on the anode assembly 210. In the case where the process device 240 is assembled to the anode assembly 210, the vibration speed of the anode assembly 210 may be different even at the same rotation speed, compared to the case where a liquid metal bearing structure is assembled. Specifically, the vibration speed of the anode assembly 210 is generally increased in the case where the liquid metal bearing structure is formed by assembly, relative to the case where the process device 240 is assembled at the anode assembly 210. Wherein the vibration speed is increased within the range of 0.4-0.9mm/s, and the maximum value is not more than 1mm/s.

Therefore, in order to finally enable the dynamic balance correction of the anode assembly of the X-ray tube to reach the qualified standard (namely, the vibration speed is less than 3 mm/s), when the dynamic balance correction is carried out by adopting the process device disclosed by the invention, the vibration speed is controlled within 2mm/s (namely, the second vibration speed threshold).

Thus, referring to fig. 6, after the mandrel 241 is fixed on the dynamic balance test platform 311 and the anode assembly 210 is driven to rotate by the coil 312, the vibration velocity of the anode assembly 210 is detected by the vibration sensor 314 during the rotation of the anode assembly 210. So that when the vibration speed of the anode assembly 210 is greater than 2mm/s, the rotation of the anode assembly 210 is stopped and the anode assembly 210 is subjected to the deduplication process.

The above operation is then continued to be repeated until the vibration velocity of the anode assembly 210 detected by the vibration sensor 314 is less than 2 mm/s. The anode assembly 210 is now a dynamically balanced qualified anode assembly. Therefore, according to the technical scheme, the dynamic balance of the anode assembly can be adjusted to meet the requirements of practical application under the condition that the anode assembly is assembled to the process device according to the difference value of the vibration speeds of the anode assembly of the X-ray tube in the two conditions that the anode assembly is assembled to the process device and the liquid metal bearing is formed.

The 2mm/s vibration velocity threshold described above was tested for a certain type of anode assembly. It will be clear to those skilled in the art that the respective second vibration speed thresholds may be determined through testing for different models of anode assemblies by reference to the method described above for use in making dynamic balance corrections for the respective models of anode assemblies.

Optionally, the operation of determining a second vibration velocity threshold of the anode assembly 210 when assembled to the process device 240 based on the first vibration velocity threshold of the anode assembly 210 when assembled to the liquid metal bearing comprises: providing an anode assembly sample associated with anode assembly 210; carrying out dynamic balance correction on the anode assembly sample under the condition of being assembled to a corresponding process device; carrying out dynamic balance test on the anode assembly sample after dynamic balance correction under the condition of being assembled to a process device, and determining a second vibration speed of the anode assembly sample; carrying out dynamic balance test on the anode assembly sample after dynamic balance correction under the condition that a corresponding liquid metal bearing is formed by assembling, and determining a third vibration speed of the anode assembly sample; determining a vibration speed difference value between the third vibration speed and the second vibration speed; and determining a second vibration speed threshold according to the first vibration speed threshold and the vibration speed difference.

As described above, the technical solution of the present disclosure performs the test for two sets of 10 sets of anode assemblies (i.e., anode assembly samples), and obtains the test data shown in table 1 and table 2, which includes: the vibration speed (i.e. the second vibration speed) of the anode assembly after the dynamic balance correction under the condition of assembling the process device, the vibration speed (i.e. the third vibration speed) of the anode assembly after being assembled to form the liquid metal bearing and the difference value are tested. It was thus determined that the vibration speed of anode assembly 210 generally increased with anode assembly 210 assembled to form a liquid metal bearing structure, relative to the case where anode assembly 210 was assembled to process device 240. Wherein the vibration speed is increased within the range of 0.4-0.9mm/s, and the maximum value is not more than 1mm/s (i.e. vibration speed difference). Therefore, in order to finally make the dynamic balance correction of the anode assembly of the X-ray tube reach the qualified standard (namely, the vibration speed is less than 3 mm/s), when the dynamic balance is carried out by adopting the process device disclosed by the invention, the vibration speed is controlled within 2mm/s (namely, the second vibration speed threshold).

In this way, the anode assembly 210 can be accurately corrected for dynamic balance with the anode assembly 210 assembled to the process device 240.

Optionally, the method further comprises: the anode assembly 210 after the dynamic balance correction is filled with liquid metal 230 and the bearing core 220 is assembled, thereby forming a liquid metal bearing structure at the anode assembly 210. The anode assembly 210 is thus assembled into the X-ray tube through the liquid metal bearing after dynamic balance correction.

Fig. 7 shows a schematic diagram of anode assembly 210 after dynamic balance correction being filled with liquid metal 230 and bearing core 220 assembled to form a liquid metal bearing structure on anode assembly 210. Referring to fig. 7, the rotating outer sleeve 213 of the anode assembly 210 is sleeved outside the bearing core 220 from the front end of the bearing core 220 with the liquid metal 230 spaced between the rotating outer sleeve 213 and the bearing core 220, and the rotating flange 214 is sleeved on the bearing core 220 from the rear end of the bearing core 220 and connected to the rear end of the rotating outer sleeve 213 for sealing the liquid metal 230 against leakage of the liquid metal 230.

And fig. 8 further shows a schematic view of an X-ray tube, referring to fig. 8, an anode assembly 210 is arranged inside a metal envelope 251, and on the outside of the metal envelope 251, a coil 252 is arranged around said anode assembly 210 for driving the anode assembly 210 in rotation.

Further, according to another aspect of the present embodiment, there is provided a dynamic balance testing system for an anode assembly of a liquid metal bearing of an X-ray tube, wherein the anode assembly is an anode assembly rotating based on the liquid metal bearing. The system comprises: the process device 240 is used for performing a dynamic balance test on the anode assembly, wherein the process device 240 comprises a mandrel 241 and rolling bearings 243a and 243b sleeved on the mandrel 241; a dynamic balance test platform 311 for fixing a mandrel 241 of the process device 240; a coil 312 for driving the anode assembly 210 to rotate under the condition that the anode assembly is sleeved on the process device 240; a rotation speed sensor 313 for detecting a rotation speed of the anode assembly; and a vibration sensor 314 disposed on the dynamic balance test platform 311 for detecting vibration of the anode assembly under the condition that the anode assembly rotates.

Optionally, the processing device 240 further includes shaft sleeves 242a, 242b sleeved on the spindle 241, and the rolling bearings 243a, 243b include a first rolling bearing 243a and a second rolling bearing 243b, wherein the shaft sleeves 242a, 242b are disposed between the first rolling bearing 243a and the second rolling bearing 243 b.

Alternatively, the first rolling bearing 243a and the second rolling bearing 243b are angular contact bearings.

Alternatively, the radial runout of the rolling bearings 243a, 243b relative to the axis of the spindle 241 is less than 0.01mm, and the end runout of the rolling bearings 243a, 243b relative to the axis of the spindle 241 is less than 0.01mm.

In addition, for further contents of the system, refer to the contents described in the first aspect of the present embodiment.

Accordingly, the technical scheme of the present disclosure provides a process device provided with a rolling bearing, so that an anode assembly is assembled with the process device and action balance correction is performed before the anode assembly is assembled to form a liquid metal bearing. Damage to the liquid metal bearing during dynamic balance correction of the anode assembly is thus avoided. And the situation that the dynamic balance correction process is low in efficiency due to liquid metal leakage in the dynamic balance correction process is avoided. Therefore, the technical problems that the efficiency is low and the liquid metal bearing is easily damaged in the process of carrying out dynamic balance correction on the anode assembly of the liquid metal bearing are solved.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present disclosure, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are provided only for convenience of description and for simplicity of description, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A method for dynamic balance correction of an X-ray tube liquid metal bearing anode assembly, comprising:

providing a process device (240) for performing a dynamic balance test on an anode assembly (210) of an X-ray tube, wherein the anode assembly (210) is an anode assembly rotating based on a liquid metal bearing, and the process device (240) comprises a mandrel (241) and rolling bearings (243 a, 243 b) sleeved on the mandrel (241);

-fitting the anode assembly (210) to the process device (240) such that the anode assembly (210) is rotatable relative to the mandrel (241) supported by the rolling bearing (243 a, 243 b);

fixing the mandrel (241) and performing a dynamic balance test on the anode assembly (210); and

and according to the result of the dynamic balance test, performing dynamic balance correction on the anode assembly (210).

2. The method according to claim 1, wherein the process device (240) further comprises a bushing (242 a, 242 b) sleeved on the spindle (241) and the rolling bearing (243 a, 243 b) comprises a first rolling bearing (243 a) and a second rolling bearing (243 b), wherein the bushing (242 a, 242 b) is disposed between the first rolling bearing (243 a) and the second rolling bearing (243 b).

3. The method of claim 2, wherein the anode assembly (210) comprises an anode target disk (211), a rotating outer sleeve (213) connected to the anode target disk (211), and a rotating flange (214) connected to the rotating outer sleeve (213), and wherein the operation of assembling the anode assembly (210) to the process equipment (240) comprises:

sleeving the rotating outer sleeve (213) on the outer sides of the first rolling bearing (243 a) and the second rolling bearing (243 b) from the front end of the process device (240), and radially positioning an inner hole of the rotating outer sleeve (213) through the first rolling bearing (243 a) and the second rolling bearing (243 b);

a spring (244) is sleeved from the rear end of the mandrel (241), and the spring (244) is abutted against the rear end of the second rolling bearing (243 b); and

sleeving the rotating flange (214) on the mandrel (241) from the rear side of the mandrel (241), and connecting and fixing the rotating flange (214) to the rear end of the rotating outer sleeve (213), wherein the rotating flange (214) applies axial preload to the second rolling bearing (243 b) through the spring (244).

4. The method of claim 1, wherein the operation of performing a dynamic balancing test on the anode assembly (210) comprises: fixing the mandrel (241) and driving the anode assembly (210) to rotate; and detecting vibrations of the anode assembly (210) during rotation of the anode assembly (210), and

-operation of dynamic balance correction of the anode assembly (210) according to the result of the dynamic balance test, comprising: and according to the vibration condition of the anode assembly (210) in the rotating process, carrying out dynamic balance correction on the anode assembly (210).

5. The method of claim 4, further comprising: determining a second vibration speed threshold of the anode assembly (210) with assembly to the process device (240) based on a first vibration speed threshold of the anode assembly (210) with assembly to a liquid metal bearing, and

the operation of dynamic balance correction of the anode assembly (210) according to the vibration condition of the anode assembly (210) in the rotating process comprises the following steps:

detecting a first vibration speed of the anode assembly (210) during rotation of the anode assembly (210); and

performing a deduplication operation on the anode assembly (210) if the detected first vibration speed is greater than the second vibration speed threshold.

6. The method of claim 5, wherein the operation of determining a second vibration velocity threshold of the anode assembly (210) with the anode assembly (210) mounted to the process device (240) from the first vibration velocity threshold of the anode assembly (210) with the anode assembly mounted to a liquid metal bearing comprises:

providing an anode assembly sample associated with the anode assembly (210);

carrying out dynamic balance correction on the anode assembly sample under the condition of being assembled to a corresponding process device;

carrying out dynamic balance test on the anode assembly sample after dynamic balance correction under the condition of being assembled to a corresponding process device, and determining a second vibration speed of the anode assembly sample;

carrying out dynamic balance test on the anode assembly sample after dynamic balance correction under the condition that a corresponding liquid metal bearing is formed by assembling, and determining a third vibration speed of the anode assembly sample;

determining a vibration velocity difference between the third vibration velocity and the second vibration velocity; and

and determining the second vibration speed threshold according to the first vibration speed threshold and the vibration speed difference.

7. The method of claim 1, further comprising: and filling the anode assembly (210) with the liquid metal (230) after the dynamic balance correction and assembling a bearing core (220), thereby forming a liquid metal bearing structure on the anode assembly (210).

8. A dynamic balance test system for an X-ray tube liquid metal bearing anode assembly, wherein the anode assembly is a liquid metal bearing rotation based anode assembly, the system comprising:

the process device (240) is used for carrying out dynamic balance test on the anode assembly, wherein the process device (240) comprises a mandrel (241) and rolling bearings (243 a, 243 b) sleeved on the mandrel (241);

a dynamic balance test platform (311) for securing a mandrel (241) of the process device (240);

a coil (312) for driving the anode assembly (210) to rotate with the anode assembly nested in the process device (240);

a rotational speed sensor (313) for detecting a rotational speed of the anode assembly; and

a vibration sensor (314) disposed on the dynamic balance test platform (311) for detecting vibration of the anode assembly when the anode assembly is rotating.

9. The dynamic balance testing system of claim 8, wherein the process device (240) further comprises a bushing (242 a, 242 b) sleeved on the mandrel (241), and the rolling bearing (243 a, 243 b) comprises a first rolling bearing (243 a) and a second rolling bearing (243 b), wherein the bushing (242 a, 242 b) is disposed between the first rolling bearing (243 a) and the second rolling bearing (243 b).

10. The dynamic balance testing system of claim 9, wherein the first rolling bearing (243 a) and the second rolling bearing (243 b) are angular contact bearings, and

the radial run-out of the rolling bearing (243 a, 243 b) relative to the axis of the mandrel (241) is less than 0.01mm, and the end-face run-out of the rolling bearing (243 a, 243 b) relative to the axis of the mandrel (241) is less than 0.01mm.

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