Filament height adjusting structure, system and device

Abstract

The utility model provides a filament height adjusting structure, system and device. The filament height adjusting structure comprises an annular support, a connecting column, an adjusting base, two adjusting pieces and two supporting pieces. The adjusting base comprises an upper base and a lower base; the lower base is arranged to be a door-shaped cylindrical body; the annular support is fixedly connected with the upper base through a connecting column. A boss is arranged on an upper base plate of the lower base, a groove is formed in the bottom of the upper base, and the boss is matched with the groove. The boss is provided with two through holes, and the two through holes also penetrate through the upper substrate. The adjusting pieces are arranged on the lower base plate of the lower base and correspondingly penetrate through the through holes; two through holes are formed in the upper base; a supporting piece is correspondingly arranged in each through hole; the bottom of the supporting piece makes contact with the top of the adjusting piece. According to the utility model, the relative distance between the top of the filament assembly and the bottom of the focusing groove is finely regulated by arranging the fine tuning thread pair, thereby ensuring the controllability of the relative distance between the top of the filament and the bottom of the focusing groove in the assembling process.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially is a kind of filament height adjusting structure, system and device. BACKGROUND

[0002] Rotary anode X-ray tube is a kind of tubular device using high-speed electron emitted by cathode to impact heavy metal target (anode target) surface to generate X-ray.Rotary anode X-ray tube connects target material with bearing, maintains high-speed movement of target material when electron bombardment, shortens the time of target material single face to bear electron bombardment, increases target material heat receiving area, greatly improves the ability and heat dissipation efficiency of target material to resist electron bombardment.The filament cathode of rotary anode X-ray tube is generally made of tungsten wire doped with trace metal elements which help to improve electron emission performance.Under certain heating power, the temperature of filament rises, so that the internal electron obtains energy and escapes from the surface, forming an electron cloud with certain density around the filament, high voltage is applied between the anode and the cathode outside the tube core, and the electron is accelerated to impact the anode target under the action of high-voltage electric field, and less than 1% of the energy is converted into X-ray radiation outside after collision.Among the influencing factors of rotary anode X-ray tube focus, the relative position between the top end of filament and the bottom of focusing groove has greater influence. That is, when the top end of filament gradually protrudes into the focusing groove, the focus point becomes smaller and gradually defocuses; when the top end of filament gradually sinks into the focusing groove, the focus point changes slightly, but when the top end of filament completely sinks into the focusing groove, the emission of filament will be inhibited due to space charge limitation. Therefore, when assembling the cathode component, the relative distance between the top end of filament and the bottom of focusing groove should be strictly controlled, and the tolerance should be controlled within 0.03mm.

[0003] In the prior art, the relative position of the cathode part of rotary anode X-ray tube is generally positioned directly by tool contact, that is, the relative distance between the top end of filament and the focusing groove can only be measured after positioning is completed, and real-time adjustment of the relative distance is not possible. Moreover, tungsten wire and tool are in direct contact, and when filament is deformed under force, the tool is removed after positioning is completed, which makes filament return to the state without force, which may cause the size of the relative distance between the top end of filament and the focusing groove to be out of tolerance, resulting in that the filament cannot be used, causing waste of parts.

[0004] Therefore, it is necessary to further improve the filament height adjusting device of rotary anode X-ray tube.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application and facilitating the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art just because it is described in the background section of the present application. CONTENT OF THE UTILITY MODEL

[0006] In view of the above-mentioned prior art defects, the purpose of the utility model is to provide a lamp filament height adjusting structure, system and device for solving the problem that the relative distance between the lamp filament top end and the focusing groove of the rotating anode X-ray tube cannot be adjusted in real time in the prior art. Moreover, the tungsten filament and the tooling are in direct contact, and when the lamp filament is deformed under force, the tooling is removed after positioning, so that the lamp filament will return to the state of no force, resulting in the inability to use, causing the dilemma and technical problem of waste of parts.

[0007] To achieve the above-mentioned purpose and other related purposes, the utility model provides a lamp filament height adjusting structure, which comprises: an annular support, a connecting column, an adjusting base, two adjusting pieces and two supporting pieces.

[0008] The adjusting base comprises an upper base and a lower base; the lower base is provided in the shape of a door-shaped cylindrical body; the annular support is fixedly connected with the upper base through the connecting column;

[0009] A boss is arranged on the upper base plate of the lower base, and a groove is arranged on the bottom of the upper base, and the boss matches the groove; two through holes are arranged on the boss, and the two through holes also penetrate the upper base plate of the lower base; each adjusting piece is arranged on the lower base plate of the lower base, and the top of each adjusting piece passes through each through hole; two through holes are arranged on the upper base, and each supporting piece is correspondingly arranged in each through hole; the bottom of the supporting piece is in contact with the top of the adjusting piece.

[0010] Optionally, the through hole is provided in the shape of a cuboid.

[0011] Optionally, the supporting piece is provided in the shape of a cuboid.

[0012] Optionally, the adjusting piece is provided in the shape of a fine adjustment threaded pair.

[0013] Optionally, the precession amount of the fine adjustment threaded pair rotating one circle is set to 0.2mm-0.3mm.

[0014] Optionally, the upper base and the lower base are fixedly connected through laser spot welding.

[0015] The utility model also provides a lamp filament height adjusting system, which at least comprises: a cathode porcelain bead assembly, a lamp filament assembly and the lamp filament height adjusting structure.

[0016] The cathode porcelain bead assembly is arranged on the upper base through the annular fixing support;

[0017] The cathode porcelain bead assembly comprises two focusing grooves, and the two focusing grooves are symmetrically arranged based on the longitudinal center line of the lamp filament height adjusting structure.

[0018] The filament assembly is arranged in the cathode porcelain bead assembly; the filament assembly comprises a large filament assembly and a small filament assembly; the bottom of the large filament assembly is in contact with the top of the corresponding support; the bottom of the small filament assembly is in contact with the top of the corresponding support.

[0019] Optionally, the filament height adjusting system further comprises N fixing members; the annular support is provided with N threaded holes in the circumferential direction, and the fixing members are in contact with the outer sidewall of the cathode porcelain bead assembly through the threaded holes; wherein N is a natural number greater than 2.

[0020] Optionally, the inclined base and the filament height adjusting system are provided; the bottom of the lower base is provided with a limiting groove; the inclined surface of the inclined base is provided with a limiting member, and the limiting member and the limiting groove cooperate to fix the filament height adjusting system on the inclined base; the bottom of one focusing groove is parallel to the horizontal plane.

[0021] Optionally, the filament height adjusting device further comprises a measuring member for measuring the relative distance between the bottom of each focusing groove and the top end of the corresponding filament assembly, and the filament height adjusting system is arranged below the measuring member.

[0022] As described above, the filament height adjusting structure, system and device have the following beneficial effects:

[0023] The filament height adjusting structure, system and device of the present application finely adjust and control the relative distance between the top of the filament assembly and the bottom of the focusing groove through the fine adjustment threaded pair, and realize real-time measurement of the relative distance through the measuring member. The controllability of the relative distance between the top of the filament assembly and the bottom of the focusing groove in the assembly process is ensured, the measurement is error-free, the height consistency of the product is further ensured, the product quality reliability is improved, the use efficiency is improved, and the production cost is reduced. By arranging the inclined base, the bottom of the focusing groove is parallel to the horizontal plane, and the accuracy of the measurement is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structure schematic view of the filament height adjusting structure of the present application is shown.

[0025] Figure 2 A structure schematic view of the fine adjustment threaded pair of the present application is shown.

[0026] Figure 3 A sectional view of the fine adjustment threaded pair of the present application is shown.

[0027] Figure 4 A structure schematic view of the filament height adjusting system of the present application is shown.

[0028] Figure 5 An explosion schematic diagram of a filament height adjusting system is shown.

[0029] Figure 6 A structure schematic diagram of a cathode head assembly is shown.

[0030] Figure 7 A top view of a cathode head assembly is shown.

[0031] Figure 8 A structure schematic diagram of a filament height adjusting device is shown.

[0032] Element number explanation

[0033] 1 filament height adjusting structure

[0034] 10 annular support

[0035] 11 connecting column

[0036] 12 adjusting base

[0037] 120 upper base

[0038] 121 lower base

[0039] 121a upper base plate

[0040] 121b lower base plate

[0041] 121c supporting column

[0042] 121d boss

[0043] 121e limiting groove

[0044] 13 adjusting piece

[0045] 130 precision threaded rod

[0046] 131 hexagonal belt locking nut

[0047] 132 screw-in knob

[0048] 14 supporting piece

[0049] 2 filament height adjusting system

[0050] A cathode head assembly

[0051] 20 cathode porcelain bead assembly

[0052] 200 focusing groove

[0053] 21 filament assembly

[0054] 210 filament assembly

[0055] 211 filament assembly

[0056] 212 clamping rod of filament assembly

[0057] H1 first relative distance

[0058] H2 second relative distance

[0059] 22 fixing member

[0060] 3 filament height adjusting device

[0061] 30 tilting base

[0062] 300 limiting member DETAILED DESCRIPTION

[0063] The embodiments of the present application will be described in detail by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification.

[0064] Please refer to Figures 1 to 8 . It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are only used to cooperate with the contents disclosed in the present specification for understanding and reading by those skilled in the art, and do not have technical substantial meaning to limit the implementation conditions of the present application, so any change in decoration, proportional relationship or adjustment in size does not affect the effects and purposes that can be achieved by the present application, and should still fall within the scope of the technical contents disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for the convenience of clear description, and are not used to limit the implementation range of the present application, and the change or adjustment of the relative relationship without substantial change in technical content is also considered as the implementation scope of the present application.

[0065] As shown in Figure 1 , the present embodiment provides a filament height adjusting structure 1, which comprises a ring-shaped support 10, a connecting column 11, an adjusting base 12, two adjusting members 13 and two supporting members 14.

[0066] As shown in Figure 1 , the adjusting base 12 comprises an upper base 120 and a lower base 121; the lower base 121 is provided as a door-shaped cylindrical body.

[0067] Specifically, in the embodiment, the lower base 121 is arranged as a door-shaped cylindrical body, that is, two support columns 121c are arranged at two ends of the upper base plate 121a and the lower base plate 121b of the lower base 121 to form the lower base 121 of the door-shaped cylindrical body, the upper base plate 121a and the lower base plate 121b are supported by the support columns 101c, the adjusting member 13 is further conveniently placed between the upper base plate 121a and the lower base plate 121b, and the adjusting operation of the adjusting member 13 is also convenient. In actual use, the shape of the lower base can be arranged at will according to the needs, which is not described here.

[0068] As shown in Figure 1 The annular support 10 is fixedly connected with the upper base 120 through the connecting column 11.

[0069] Specifically, in the embodiment, the annular support 10 and the upper base 120 are connected into an integrated body through the connecting column 11. The connecting column 11 is arranged at the center position of the annular support 10 and the upper base plate 121a of the upper base 120. In actual use, the position of any connecting column which can integrally connect the annular support and the upper base can be arranged at will according to the needs, which is not described here. The connecting column 11 is arranged to form a gap between the annular support 10 and the upper base 120, that is, an operation opening is reserved, so that after the relative distance between the top of the filament assembly and the bottom of the focusing groove is adjusted, the cathode porcelain bead assembly and the filament assembly are fixed by pincers at the operation opening. In actual use, any method which can fix the cathode porcelain bead assembly and the filament assembly at the position of the reserved operation opening is applicable to the utility model, which is not limited to the embodiment.

[0070] As shown in Figure 1 The upper base plate 121a of the lower base 121 is provided with a boss 121d, and the lower surface of the upper base 120 is provided with a groove matched with the boss 121d. The boss 121d is provided with two through holes which also penetrate the upper base plate 121a of the lower base 121. Each adjusting member 13 is arranged on the lower base plate 121b of the lower base 121 and corresponds to each through hole. The upper base 120 is provided with two through holes which correspond to the positions of the two filament pins of the cathode porcelain bead assembly. In actual use, the positions of the through holes can be arranged at will according to the needs, which is not described here. Each through hole is correspondingly provided with a support member 14, and the bottom of the support member 14 is in contact with the top of the adjusting member 13.

[0071] Specifically, in the embodiment, the boss 121d is set as a circular boss, and the groove is set as a circular groove, so that the circular boss and the circular groove are arranged in a concentric manner. In actual use, the shapes of the boss and the groove can be set as needed, and are not limited to the embodiment. That is, the upper base 120 and the lower base 121 are in close contact, and then the upper base 120 and the lower base 121 are fixed by spot welding in a manner of laser welding, so as to ensure that the upper base 120 and the lower base 121 are firmly connected. In actual use, any connection mode that can fixedly connect the upper base and the lower base is applicable to the utility model, and will not be described here.

[0072] More specifically, in the embodiment, the size of the through hole should be set to be larger than the size of the support 14, so that the support 14 can freely move in the through hole 121f, and the bottom of the support 14 is in contact with the top of the adjusting part 13. The through hole 121f is set as a cuboid through hole, and the support 14 is set as a cuboid support, and the cuboid support is placed in the cuboid through hole. In actual use, the shapes of the through hole and the support can be set as needed, and will not be described here.

[0073] More specifically, in the embodiment, as shown in Figure 2 and Figure 3 , the adjusting part 13 is set as a fine adjustment threaded pair, which includes a precision threaded rod 130, a hexagonal band locking nut 131, and a screw-in knob 132. The hexagonal band locking nut 131 is arranged on the outer sidewall of the precision threaded rod 130, and the screw-in knob 132 is arranged at the bottom of the precision threaded rod 130. The amount of precession of the fine adjustment threaded pair is changed by the screw-in knob 132. The fine adjustment threaded pair can finely adjust the relative distance between the top of the filament assembly and the bottom of the focusing groove without changing the overall structure of the device, so as to achieve very fine adjustment, and further improve the sensitivity and stability of the device. In actual use, any adjusting part that can adjust the relative distance between the top of the filament and the bottom of the focusing groove can be set as needed, and is not limited to the embodiment. The amount of precession of one rotation of the fine adjustment threaded pair is set to 0.2 mm to 0.3 mm, such as 0.22 mm, 0.24 mm, 0.26 mm, or 0.29 mm. In actual use, any amount of precession of the fine adjustment threaded pair can be selected as needed, and will not be described here.

[0074] As shown in Figure 4 and Figure 5 , the utility model also provides a filament height adjusting system 2 for precisely adjusting the relative distance between the top of the filament assembly and the bottom of the focusing groove. The filament height adjusting system 2 includes a cathode porcelain bead assembly 20, a filament assembly 21, and a filament height adjusting structure 1.

[0075] AsFigure 4 and Figure 5 As shown in

[0076] Specifically, in the embodiment, as shown in Figure 6 and Figure 7 The cathode porcelain bead assembly 20 includes two focusing grooves 200, which are obliquely arranged on the cathode porcelain bead assembly 20 and symmetrically arranged based on the longitudinal center line of the filament height adjusting structure 1. That is, the two focusing grooves 200 are axisymmetrically arranged, and the two focusing grooves 200 form an angle α, and the included angle between the two focusing grooves 200 and the horizontal plane is β = 90°-α / 2, so the filament height adjusting structure 1 needs to be placed on an inclined base. That is, to ensure that the bottom of one of the focusing grooves 200 is parallel to the horizontal plane, to accurately measure the relative distance between the top of the filament assembly 21 and the bottom of the corresponding focusing groove 200, and to further ensure the accuracy of the measurement.

[0077] As shown in Figure 4 and Figure 5 The filament height adjusting system 2 further includes N fixing members 22; the annular support 10 is provided with N threaded holes in the circumferential direction, and the fixing member 22 is in contact with the outer side wall of the cathode porcelain bead assembly 20 through the threaded hole; wherein N is a natural number greater than 2.

[0078] Specifically, in the embodiment, the fixing member 22 is set as a clamping screw, and in actual use, any structure that can fix the cathode porcelain bead assembly is suitable for the fixing member of the utility model, which will not be described one by one. That is, the annular fixing support 10 is provided with three threaded holes in the circumferential direction, and the three threaded holes are correspondingly provided with three clamping screws, and the cathode porcelain bead assembly 20 is fixed by the three clamping screws, and in actual use, the number of fixing members can be arbitrarily set as needed, which is not limited by the embodiment.

[0079] As shown in Figure 6 and Figure 7 The filament assembly 21 is arranged in the cathode porcelain bead assembly 20 to form a cathode head assembly A. The filament assembly 21 includes a large filament assembly 210 and a small filament assembly 211; the bottom of the large filament assembly 210 is in contact with the top of the corresponding support 14; and the bottom of the small filament assembly 211 is in contact with the top of the corresponding support 14.

[0080] Specifically, in the embodiment, as shown in Figure 6 and Figure 7As shown, the filament assembly 21 passes through the focusing groove 200 to form a cathode head assembly A, and the bottom of the filament assembly 21 is in contact with the top of the corresponding support 14. A connecting column 11 is arranged between the annular fixing support 20 and the upper base 120, that is, a reserved operation opening for fixing the cathode porcelain bead assembly 20 and the filament assembly 21 is arranged, so that after the relative distance between the top of the filament assembly 21 and the bottom of the focusing groove 200 is adjusted, the cathode porcelain bead assembly 20 and the filament assembly 21 are fixed by pressing at the reserved operation opening through the forceps.

[0081] As shown in the drawings, Figure 8 The utility model also provides a filament height adjusting device 3, which comprises: an inclined base 30 and a filament height adjusting system 2; the bottom of the lower base plate 121b is provided with a limiting groove 121e; the inclined surface of the inclined base 30 is provided with a limiting piece 300, which cooperates with the limiting groove 121e to fix the filament height adjusting system 2 on the inclined base 30; and the bottom of the focusing groove 200 is parallel to the horizontal plane. In actual use, any fixing mode that can flexibly fix the filament height adjusting system on the inclined base is applicable to the utility model, and thus will not be described here.

[0082] Specifically, in the embodiment, the filament height adjusting device 3 further comprises a measuring piece (not shown in the drawings) for measuring the relative distance between the bottom of each focusing groove 200 and the top end of the corresponding filament assembly 21. The measuring piece includes but is not limited to a projector, and the filament height adjusting system 2 is arranged below the measuring piece. In actual use, the relative position of the measuring piece and the filament height adjusting system can be arbitrarily set as required, and is not limited to the embodiment. The relative position of the measuring piece and the filament height adjusting system 2 is set to measure the relative distance between the top of each filament assembly 21 and the bottom of each focusing groove 200, and obtain the corresponding relative distance data. In actual use, any device that can measure and obtain the relative distance data between the top of each filament assembly 21 and the bottom of each focusing groove 200 is applicable to the utility model, and thus will not be described here.

[0083] The utility model also provides a filament height adjusting method, which is realized based on the filament height adjusting device 3. First, the bottom of the focusing groove 200 corresponding to the large filament assembly 210 is made parallel to the horizontal plane, and the first relative distance H1 between the top of the large filament assembly 210 and the corresponding focusing groove 200 is measured. Then, the entire filament height adjusting device 3 is rotated, so that the bottom of the focusing groove 200 corresponding to the small filament assembly 211 is made parallel to the horizontal plane, and the second relative distance H2 between the top of the small filament assembly 211 and the corresponding focusing groove 200 is measured. The specific operation steps of the filament height adjusting method are as follows:

[0084] S1, install the cathode porcelain bead assembly 20 on the upper base 120 through the annular support 10, and fix the cathode porcelain bead assembly 20 through the fixing member 22.

[0085] S2, install the large filament assembly 210 and the small filament assembly 211 into the cathode porcelain bead assembly 20 to form the cathode head assembly A, and based on the influence of gravity, the bottom of the large filament assembly 210 and the small filament assembly 211 will be in contact with the top of the support member 14.

[0086] S3, place the whole filament height adjusting system 2 on the inclined base 30, ensure that the bottom of one of the focusing grooves 200 is parallel to the horizontal plane, and place the whole filament height adjusting system 2 below the measuring member.

[0087] S4, measure the relative distance between the top of the filament assembly 21 and the bottom of the corresponding focusing groove 200, and then fine-tune the relative distance between the top of the filament assembly 21 and the bottom of the focusing groove 200 through the adjusting member 13.

[0088] S5, after adjusting to the required range, pre-fix the corresponding filament assembly 21 and the corresponding clamping rod 212 through the tweezers at the operation port.

[0089] S6, after pre-fixing, again detect the data of the relative distance between the top of the filament assembly 21 and the bottom of the corresponding focusing groove 200 through the measuring member, if the data is not within the required range, then adjust again through the adjusting member 13, until the required range is reached, and then firmly fix the corresponding filament assembly 21 and the corresponding clamping rod 212.

[0090] S7, raise the whole filament height adjusting system 2 from the inclined base 30 and rotate it by 180°, so that the bottom of the other focusing groove 200 is parallel to the horizontal plane, and repeat steps S4-S6.

[0091] In summary, the utility model provides a kind of filament height adjusting structure, system and device, it include: annular support, connecting column, adjusting base, two adjusting pieces and two support pieces;Adjusting base includes upper base and lower base;Lower base is set to door-shaped cylinder;Annular support is fixedly connected with upper base by connecting column;The upper base plate of lower base is provided with boss, and the bottom of upper base is provided with groove, and boss is matched with groove;Two through holes are arranged on boss, and two through holes also penetrate upper base plate;Each adjusting piece is arranged on the lower base plate of lower base, and each adjusting piece passes through each through hole respectively;Two through holes are arranged in upper base;Support piece is arranged in each through hole respectively;The bottom of support piece is in contact with the top of adjusting piece.The utility model is finely adjusted by setting fine adjustment screw pair to control the relative distance between the top of filament assembly and the bottom of focusing groove, and the relative distance is measured in real time by using measuring piece.The controllability of the relative distance between the top of filament assembly and the bottom of focusing groove in assembly process is guaranteed, and the measurement is error-free, the height consistency of product is guaranteed, the product quality reliability is improved, the use efficiency is improved, and the production cost is reduced.The utility model effectively overcomes the shortcomings in the prior art and has high industrial utilization value.

[0092] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model.Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model.Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical concept disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A filament height adjustment structure, characterized by, The filament height adjusting structure comprises a ring-shaped support, a connecting column, an adjusting base, two adjusting members and two supporting members. The adjusting base comprises an upper base and a lower base; the lower base is in the shape of a door-shaped cylinder; the ring-shaped support is fixedly connected with the upper base through the connecting column. A boss is arranged on the upper base plate of the lower base; a groove is arranged on the bottom of the upper base; the boss matches the groove; two through holes are arranged on the boss and also penetrate the upper base plate of the lower base; each adjusting member is arranged on the lower base plate of the lower base, and the top of each adjusting member passes through each through hole; two through holes are arranged on the upper base, and each supporting member is arranged in each through hole; the bottom of the supporting member is in contact with the top of the adjusting member.

2. The filament height adjustment structure according to claim 1, characterized by: The through hole is in the shape of a cuboid.

3. The filament height adjustment structure according to claim 1, characterized by: The supporting member is in the shape of a cuboid.

4. The filament height adjustment structure according to claim 1, characterized by: The adjusting member is a fine adjustment threaded pair.

5. The filament height adjustment structure according to claim 4, characterized in that: The precession of one rotation of the fine adjustment threaded pair is set to 0.2mm-0.3mm.

6. The filament height adjustment structure according to claim 1, characterized by: The upper base and the lower base are fixedly connected through laser spot welding.

7. A filament height adjustment system, characterized in that The filament height adjusting system comprises a cathode porcelain bead assembly, a filament assembly and the filament height adjusting structure according to any one of claims 1-6. The cathode porcelain bead assembly is arranged on the upper base through the ring-shaped support. The cathode porcelain bead assembly comprises two focusing grooves, which are symmetrically arranged based on the longitudinal center line of the filament height adjusting structure. The filament assembly is arranged in the cathode porcelain bead assembly; the filament assembly comprises a large filament assembly and a small filament assembly; the bottom of the large filament assembly is in contact with the top of the corresponding supporting member; the bottom of the small filament assembly is in contact with the top of the corresponding supporting member.

8. The filament height adjustment system of claim 7, wherein: The filament height adjusting system further comprises N fixing members; N threaded holes are arranged on the circumference of the ring-shaped support; the fixing members are in contact with the outer sidewall of the cathode porcelain bead assembly through the threaded holes; wherein N is a natural number greater than 2.

9. A filament height adjustment device, characterized in that The filament height adjusting device comprises an inclined base and the filament height adjusting system according to any one of claims 7-8; the bottom of the lower base plate is provided with a limiting groove; a limiting member is arranged on the inclined surface of the inclined base; the limiting member and the limiting groove cooperate to fix the filament height adjusting system on the inclined base; the bottom of one of the focusing grooves is parallel to the horizontal plane.

10. The filament height adjustment device of claim 9, wherein: The filament height adjusting device further comprises a measuring member for measuring the relative distance between the bottom of each focusing groove and the top end of the corresponding filament assembly; the filament height adjusting system is arranged below the measuring member.

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