Projection calibration process and projection calibration tooling for magnetron cathode assembly

Abstract

The present invention provides a projection calibration process and a projection calibration tool for a magnetron cathode assembly. The projection calibration tool comprises a base, a workbench, a light source part, and a projection screen. The workbench comprises a sleeve part and a light-transmitting part. The sleeve part is used to sleeve the part to be calibrated of the cathode assembly. The projection calibration tool also comprises a reflector group for projecting the part to be calibrated onto the projection screen. The objective lens magnification of the reflector group is N, wherein N>1. The projection calibration process comprises projection calibration of the filament assembly: the filament assembly is placed in the projection calibration tool of the magnetron cathode assembly and rotated, and the positional relationship of the lower end cap, the upper end cap, and the filament in the filament assembly is calibrated and adjusted with reference to the standard workpiece drawing on the projection screen of the projection calibration tool. Through the projection calibration process and the projection calibration tool of the present invention, the stringent requirements on assembly accuracy of parts such as long leads, lower end caps, filaments, and upper end caps are effectively guaranteed and met, thereby ensuring the concentricity between the cathode assembly and the anode assembly.

Description

Technical Field

[0001] The invention relates to the technical field of magnetrons of microwave equipment, and in particular to a projection calibration process and a projection calibration tool for a magnetron cathode assembly. Background Art

[0002] A magnetron is an electric vacuum device used to generate microwave energy. It is essentially a diode placed in a constant magnetic field. Under the control of mutually perpendicular constant magnetic fields and constant electric fields, the electrons in the tube interact with the high-frequency electromagnetic field, converting the energy obtained from the constant electric field into microwave energy, thereby achieving the purpose of generating microwave energy. The characteristics of a magnetron are high power, high efficiency, low operating voltage, small size, light weight and low cost.

[0003] In the prior art, the magnetron mainly includes an anode assembly, a cathode assembly, and an exhaust pipe assembly, etc., and the concentricity and vacuum degree of each component are important indicators for determining whether the magnetron is qualified. After the magnetron is assembled, in order to cut off the part of the magnetron into a vacuum state, a cathode assembly is set at the lower end of the magnetron, and the cathode assembly is connected to the anode cylinder through a K side tube. Before the connection, the assembly accuracy between the various parts in the cathode assembly must be guaranteed.

[0004] The cathode assembly has many parts, which usually include terminals, a support body, a K side tube, a lower end cap, a long lead, a filament, an upper end cap, etc. Any slight displacement of each part during assembly may cause the cathode assembly to have substandard assembly accuracy, and further cause the concentricity between the cathode assembly and the anode assembly to not meet the standards. In particular, the long lead, the lower end cap, the filament, the upper end cap and other parts have extremely stringent requirements on assembly accuracy. How to efficiently ensure the assembly accuracy of each part in the cathode assembly has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is: the first aspect is to propose a projection calibration process for the cathode assembly of a magnetron, which effectively guarantees and meets the stringent requirements on the assembly accuracy of parts such as long leads, lower end caps, filaments, and upper end caps, thereby ensuring the concentricity between the cathode assembly and the anode assembly.

[0006] In order to solve the above-mentioned technical problem in the first aspect, the present invention proposes a projection calibration process for a magnetron cathode assembly, including projection calibration of a filament assembly, and the specific steps are as follows:

[0007] S4: Place the filament assembly into the projection calibration fixture of the magnetron cathode assembly and rotate it. Using the standard filament assembly drawing on the projection screen of the projection calibration fixture as a reference, calibrate and adjust the positional relationship between the lower end cap, the upper end cap, and the filament in the filament assembly, and select defective products in the filament assembly.

[0008] Among them, the filament assembly includes a pre-installed assembly, a filament, and an upper end cap. The pre-installed assembly consists of a terminal assembly, a supporting body, a solder plate, a reflector, a K side tube, a lower end cap, and a long lead.

[0009] Preferably, before the projection calibration of the filament assembly, a pre-projection calibration of the pre-installed assembly is also included, and the specific steps are as follows:

[0010] ST1: Place the pre-assembled component into the projection calibration fixture of the magnetron cathode assembly and rotate it. Using the standard filament assembly drawing and / or standard pre-assembled component drawing on the projection screen of the projection calibration fixture as a reference, perform pre-calibration adjustments on the positional relationship between the lower end cap and the long lead in the pre-assembled component. Perform the assembly process with the filament and upper end cap for the pre-calibrated qualified pre-assembled component.

[0011] The technical problem to be solved by the present invention is also: the second aspect provides a projection calibration tool for the cathode assembly of a magnetron, which effectively guarantees and meets the stringent requirements on the assembly accuracy of parts such as long leads, lower end caps, filaments, and upper end caps, thereby ensuring the concentricity between the cathode assembly and the anode assembly.

[0012] In order to solve the above-mentioned technical problem in the second aspect, the present invention provides a projection calibration tool for a magnetron cathode assembly, comprising a base, a workbench, a light source part, and a projection screen, wherein the workbench comprises a socket part and a light-transmitting part, and the socket part is used to socket the part to be calibrated of the cathode assembly, and the projection calibration tool for the magnetron cathode assembly also comprises a reflector group for projecting the part to be calibrated onto the projection screen, and the objective lens magnification of the reflector group is N, where N>1.

[0013] Preferably, the workbench includes a horizontal table top and a vertical table top arranged in an L shape, the light-transmitting portion is opened on the horizontal table top, the light source portion and the base are arranged below the light-transmitting portion in sequence, the socket portion is arranged above the light-transmitting portion, one end of the socket portion is vertically connected to the vertical table top and is at a certain distance from the light-transmitting portion.

[0014] Preferably, the sleeve connection portion includes a flange and a convex ring arranged along the inner side of the flange, the outer diameter of the convex ring is equal to the inner diameter of the K-side tube of the part to be calibrated, and the convex ring is hollow.

[0015] Preferably, the sleeve connection portion further comprises a rotating shaft seat, the rotating shaft seat is concentrically arranged with the flange and the convex ring, and the rotating shaft seat is rotatably connected to the vertical table top.

[0016] Preferably, the rotating shaft seat has a bearing built therein, and a fixed shaft is extended from one side of the vertical table surface close to the horizontal table surface, and the bearing and the fixed shaft are both concentrically arranged with the rotating shaft seat.

[0017] Preferably, the outer edge of the rotating shaft seat and the outer edge of the flange are fixedly connected by two connecting ribs, and the normal spacing between the two connecting ribs is equal to the outer diameter of the rotating shaft seat and / or the flange.

[0018] Preferably, the light-transmitting portion is in the shape of a rectangle, and the width of the side of the rectangle parallel to the vertical table surface is greater than the normal distance between the two connecting ribs.

[0019] Compared with the prior art, the projection calibration process and projection calibration tooling of the magnetron cathode assembly of the present invention have the following beneficial effects:

[0020] 1) Effectively ensure and meet the stringent requirements on assembly accuracy of long leads, lower end caps, filaments, upper end caps and other parts, thereby ensuring the concentricity between the cathode assembly and the anode assembly;

[0021] 2) At the same time, the accuracy and efficiency of assembling and calibrating the parts in the cathode assembly are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of a magnetron cathode assembly according to the present invention;

[0024] Figure 2 It is a schematic diagram of a three-dimensional exploded structure of a magnetron cathode assembly according to the present invention;

[0025] Figure 3 for Figure 2 Schematic diagram of the three-dimensional explosion structure of part A;

[0026] Figure 4 It is a simplified three-dimensional structural schematic diagram of a projection calibration tool for a magnetron cathode assembly according to the present invention;

[0027] Figure 5 It is a schematic diagram of the working principle of a projection calibration tool for a magnetron cathode assembly according to the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of a workbench described in the present invention.

[0029] Description of reference numerals:

[0030] 1-terminal assembly, 11-first terminal, 12-second terminal, 2-support body, 3-solder plate, 4-reflection plate, 5-K side tube, 6-lead assembly, 61-lower end cap, 62-long lead, 7-filament, 8-upper end cap, 91-base, 92-workbench, 921-sleeve part, 9211-flange, 9212-convex ring, 9213-rotating shaft seat, 9214-connecting rib, 922-light-transmitting part, 923-horizontal table, 924-vertical table, 93-light source part, 94-projection screen, 95-reflector group, 951-the last reflector, 96-glass suction cup. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purpose, technical scheme and advantages of the present invention more clear and easy to understand, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments of the present invention described herein only constitute part of the embodiments of the present invention, which are only used to explain the present invention and do not constitute a limitation of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] For the convenience of explanation, the structure of the cathode assembly is first described. Figure 1-3 As shown, a cathode assembly is used for assembling a magnetron, comprising a terminal assembly 1, a support body 2, a solder plate 3, a reflector 4, a K side tube 5, a lead assembly 6, a filament 7, and an upper end cap 8, which are arranged in sequence from bottom to top. The terminal assembly 1 comprises a first terminal 11 and a second terminal 12 which are fixed on the reflector 4 after passing through the support body 2 and the solder plate 3 in sequence; the lead assembly 6 comprises a lower end cap 61 and a long lead 62 which passes through the lower end cap 61, the long lead 62 is located at the upper end of the lower end cap 61 and is used to install the filament 7 and the upper end cap 8, and the lower end of the long lead 62 and the lower end cap 61 are fixed in the support body 2 after passing through the K side tube 5, the reflector 4, and the solder plate 3 in sequence; the solder plate 3 is arranged between the support body 2 and the K side tube 5, and is used for welding and fixing the two. When the cathode assembly is assembled, the reflector 4 is located in the K side tube 5 and is abutted and connected with the solder plate 3. Preferably, there are two reflecting plates 4 and both are welded on the solder plate 3 , and each reflecting plate 4 is provided with a blind hole for plugging in the terminal assembly 1 and a through hole for socketing the lead assembly 6 .

[0033] Example 1

[0034] In order to effectively ensure and meet the stringent requirements on assembly accuracy of parts such as long leads, lower end caps, filaments, and upper end caps, and further ensure the concentricity between the cathode assembly and the anode assembly, the present invention proposes a projection calibration process for the cathode assembly of a magnetron, comprising the following steps:

[0035] S1: pre-assembly, brazing and demolding between the pre-assembled component and the mold, wherein the pre-assembled component is composed of a terminal component 1, a support body 2, a solder plate 3, a reflector 4, a K side tube 5, a lower end cap 61 and a long lead 62;

[0036] S2: Use helium to perform leak detection on the pre-installed components, determine the leak detection results, and execute step S3 for the pre-installed components that pass the leak detection;

[0037] S3: placing the filament 7 and the upper end cap 8 on the long lead 62 in sequence, tapping the filament assembly to naturally assemble it, and then welding and fixing the upper end cap 8, wherein the filament assembly includes a pre-assembled assembly, a filament 7, and an upper end cap 8;

[0038] S4: Place the filament assembly into the projection calibration fixture of the magnetron cathode assembly and rotate it. Using the standard filament assembly drawing on the projection screen of the projection calibration fixture as a reference, calibrate and adjust the positional relationship between the lower end cap 61, the upper end cap 8, and the filament 7 in the filament assembly, and select defective products in the filament assembly;

[0039] S5: welding and carbonizing the filament 7 of the filament assembly that has passed the calibration in step S4;

[0040] S6: Carbonization resistance detection and titanium powder coating.

[0041] Before welding and carbonizing the filament 7, the filament assembly is first calibrated and adjusted with the help of the projection calibration tooling of the magnetron cathode assembly. Under the magnification effect of the real-time projection of the filament assembly, by comparing with the reference of the standard filament assembly drawing, the positional relationship between the lower end cap 61, the upper end cap 8 and the filament 7 in the filament assembly is calibrated and adjusted in real time, thereby overcoming the defects of the human eye being difficult to identify and the human eyes and hands being unable to be highly coordinated and unified, and effectively ensuring and meeting the stringent requirements on the assembly accuracy of the lower end cap, filament, upper end cap and other parts, thereby ensuring the concentricity between the cathode assembly and the anode assembly.

[0042] Preferably, after step S2 and before step S3, the process further comprises the following steps:

[0043] ST1: Place the pre-installed component into the projection calibration tooling of the magnetron cathode component and rotate it. Using the standard filament component drawing and / or the standard pre-installed component drawing on the projection screen of the projection calibration tooling as a reference, perform pre-calibration adjustment on the positional relationship between the lower end cap 61 and the long lead 62 in the pre-installed component, pick out defective products from the pre-installed component, and execute step S3 for the pre-calibrated qualified pre-installed components.

[0044] Before placing the filament 7 and the upper end cap 8 on the long lead 62 and welding the upper end cap 8, the pre-assembled assembly is first pre-calibrated and adjusted with the help of the projection calibration tooling of the magnetron cathode assembly. On the one hand, it can greatly reduce the labor intensity in step S4, and on the other hand, it is conducive to early correction and thus reduce defective products in step S4.

[0045] It should be noted that step S4 corresponds to a specific projection calibration step for the filament assembly, and step ST1 corresponds to a specific pre-projection calibration step for the pre-installed assembly, that is, the magnetron cathode assembly, and the part to be calibrated can be a filament assembly or a pre-installed assembly. In addition, the specific description of steps S1, S2, S3, S5, and S6 in this embodiment should be understood to facilitate the understanding of the present invention, and does not constitute a limitation of the present invention.

[0046] Example 2

[0047] In order to effectively ensure and meet the stringent requirements of assembly accuracy for long leads, lower end caps, filaments, upper end caps and other parts, and thus ensure the concentricity between the cathode assembly and the anode assembly, such as Figure 4-6 As shown, the present invention provides a projection calibration tool for a magnetron cathode assembly, comprising a base 91, a workbench 92, a light source portion 93, and a projection screen 94, wherein the workbench 92 comprises a sleeve portion 921 and a light-transmitting portion 922, wherein the sleeve portion 921 is used for sleeve-fitting the part to be calibrated of the cathode assembly, and the projection calibration tool for the magnetron cathode assembly further comprises a reflector group 95 for projecting the part to be calibrated onto the projection screen 94, wherein the objective lens magnification of the reflector group 95 is N, wherein N>1.

[0048] Specifically, the projection calibration tooling of the magnetron cathode assembly has a projection working principle as follows: Figure 5 As shown, the light source unit 93 emits a light signal, which is irradiated onto the part to be calibrated that is socketed on the socket part 921 through the light-transmitting portion 922. Under the refraction of the reflector group 95, the projection of the part to be calibrated is finally projected onto the projection screen 94 with an N-fold magnification effect.

[0049] More specifically, the calibration working principle of the projection calibration tool of the magnetron cathode assembly is as follows: the overall size of the cathode assembly is relatively small, and the strict requirements on the assembly accuracy of the long lead, lower end cap, filament, upper end cap and other parts during assembly are difficult to meet only through naked eye recognition of the human body. By using the projection calibration tool of the magnetron cathode assembly, on the one hand, the part to be calibrated is sleeved on the sleeve portion 921, which is convenient for operators to calibrate and adjust the part to be calibrated. On the other hand, under the multiple magnification effect of the projection, during the calibration and adjustment of the part to be calibrated, the projection of the part to be calibrated is projected on the projection screen 94 in real time with an N-fold magnification effect, that is, it is achieved on the basis of being facilitating naked eye observation and also magnifying the naked eye recognition of the human body, so that when the cathode assembly is assembled, with the help of the projection calibration tool of the magnetron cathode assembly, the strict requirements on the assembly accuracy of the long lead, lower end cap, filament, upper end cap and other parts can be effectively guaranteed and met, thereby ensuring the concentricity between the cathode assembly and the anode assembly.

[0050] Preferably, the objective lens magnification of the reflector group 95 is: 5≤N≤10.

[0051] By setting 5≤N≤10, the stringent requirements on assembly accuracy of parts such as long leads, lower end caps, filaments, and upper end caps can be effectively guaranteed and met. At the same time, it is beneficial to reasonably control the size of the projection screen 94 and the selection and layout of the reflector group 95, thereby reducing the production cost of the projection calibration tooling of the magnetron cathode assembly.

[0052] Preferably, the projection screen 94 is located above the workbench 92 and is opened in a direction perpendicular to the workbench 92 , and the endmost reflector 951 of the reflector group 95 is located behind the projection screen 94 .

[0053] Due to the strict requirements of the cathode assembly itself on assembly accuracy, it is obvious that sitting-type operation is more conducive to the operator to concentrate on the lean calibration of parts such as long leads, lower end caps, filaments, and upper end caps. By arranging the projection screen 94 to be located above the workbench 92 and opened in a direction perpendicular to the workbench 92, the end reflector 951 of the reflector group 95 is located behind the projection screen 94. The operator can maintain a sitting posture to meet the working state of efficient coordination between both hands and eyes, which is conducive to improving the accuracy and efficiency of assembly calibration.

[0054] Preferably, glass suction cups 96 are evenly arranged around the projection screen 94 .

[0055] By arranging glass suction cups 96 evenly around the projection screen 94, a pre-prepared standard drawing enlarged in the same proportion can be placed under the glass suction cup 96 and pressed tightly, so that the standard drawing is unfolded and flattened at a specific position on the projection screen 94. During the assembly and calibration process of the cathode assembly, the projection of the part to be calibrated is projected on the projection screen 94 in real time with an N-fold magnification effect. Under the transmission of the light signal of the projection screen 94, the real-time projection of the part to be calibrated is directly compared with the standard position relationship of its parts on the standard drawing, thereby further improving the accuracy and efficiency of assembly and calibration.

[0056] Example 3

[0057] This embodiment is a further optimization made on the basis of the second embodiment with respect to the specific structural shapes of the workbench and the sleeve portion.

[0058] like Figure 6 As shown, the workbench 92 includes a horizontal table top 923 and a vertical table top 924 arranged in an L shape, the light-transmitting portion 922 is opened on the horizontal table top 923, the light source portion 93 and the base 91 are arranged below the light-transmitting portion 922 in sequence, and the socket portion 921 is arranged above the light-transmitting portion 922, one end of the socket portion 921 is vertically connected to the vertical table top 924 and is at a certain distance from the light-transmitting portion 922.

[0059] By arranging the workbench 92 in an L-shape, on the one hand, the projection calibration tooling of the magnetron cathode assembly can be made simple and practical when assembling and calibrating the cathode assembly, which is convenient for operators to perform calibration operations; on the other hand, when assembling and calibrating the part to be calibrated, the K-side tube of the part to be calibrated is sleeved on the opening end of the sleeve portion 921 away from the vertical table surface 924, and the light signal emitted by the light source portion 93 will be more concentrated in the area of ​​the sleeve portion 921 under the reflection effect of the vertical table surface 924, thereby making the real-time enlarged projection of the part to be calibrated finally projected on the projection screen 94 appear clearer.

[0060] Preferably, the sleeve portion 921 includes a flange 9211 and a convex ring 9212 arranged along the inner side of the flange 9211, the outer diameter of the convex ring 9212 is equal to the inner diameter of the K-side tube of the part to be calibrated, and the convex ring 9212 is hollow.

[0061] Specifically, Figure 3As shown, in the cathode assembly, the long lead 62 is provided with a bayonet at the bend to ensure that the upper end of the long lead 62 can also maintain concentricity with the support body 2 and the K side tube 5 while the lower end of the long lead 62 is sleeved on the reflector 4. Through the arrangement of the flange 9211 and the convex ring 9212, when the concentricity of the upper end of the long lead 62 is calibrated and adjusted, the K side tube of the part to be calibrated is sleeved on the convex ring 9212, and the upper end of the long lead 62 can pass through the convex ring 9212, which is conducive to the projection calibration of the long lead 62 in terms of concentricity.

[0062] Preferably, the sleeve portion 921 further includes a shaft seat 9213 , the shaft seat 9213 is concentrically arranged with the flange 9211 and the convex ring 9212 , and the shaft seat 9213 is rotatably connected to the vertical table 924 .

[0063] Specifically, Figure 1-2 As shown, in the assembly and calibration of the cathode assembly, the normal spacings of the lower end cap 61 and the upper end cap 8 from the K side tube 5 are required to strictly meet the relevant assembly process standards, which are directly related to the assembly accuracy of the long lead 62 and the filament 7. In the assembly and adjustment process of the lower end cap 61 and the upper end cap 8, since the K side tube 5 is sleeved on the convex ring 9212, through the setting of the rotating shaft seat 9213, the operator can directly realize the calibration adjustment of the long lead 62 relative to the K side tube 5 by rotating the rotating shaft seat 9213, thereby realizing the matching of the lower end cap 61 and the upper end cap 8 with the corresponding position relationship on the standard drawing, so that the normal spacings of the lower end cap 61 and the upper end cap 8 from the K side tube 5 strictly meet the relevant assembly process standards.

[0064] Preferably, the rotating shaft seat 9213 has a bearing built therein, and a fixed shaft is extended from one side of the vertical table 924 close to the horizontal table 923 , and the bearing and the fixed shaft are both concentrically arranged with the rotating shaft seat 9213 .

[0065] By setting a rotational connection method between the fixed shaft and the bearing, on the one hand, the convex ring 9212 can be continuously rotated in any direction, at any angle, and for any duration relative to the vertical table 924, which greatly meets the rotation requirements of the convex ring 9212. On the other hand, the rotation flexibility of this rotational connection method is better than other rotational connection methods. The operator can complete the rotation of the shaft seat 9213 relative to the vertical table 924 with only one hand. Therefore, these two aspects can make the assembly and calibration efficiency of the parts to be calibrated higher.

[0066] Preferably, the outer edge of the rotating shaft seat 9213 and the outer edge of the flange 9211 are fixedly connected by two connecting ribs 9214 , and the normal spacing between the two connecting ribs 9214 is equal to the outer diameter of the rotating shaft seat 9213 and / or the flange 9211 .

[0067] Specifically, Figure 1-3 As shown, in the cathode assembly, the concentricity of the long lead 62 at the upper end of the lower end cap 61 will change dynamically with the relative position of the lower end cap 61 relative to the K side tube 5, which may also cause the lower end cap 61, the upper end cap 8 and the filament 7 to have a certain inclination relative to the K side tube 5. In the process of the operator completing the rotation of the shaft seat 9213 relative to the vertical table 924 with only one hand, by setting the two connecting ribs 9214, on the one hand, the operator can realize and meet the rotation requirement of the convex ring 9212 by rotating the connecting ribs 9214, that is, the rotation is easier; on the other hand, when comparing the fit with the standard drawing, the fingers of the single hand can enter the internal space of the two connecting ribs 9214 to perform necessary micro-calibration adjustment on the inclination of the lower end cap 61, the upper end cap 8 and the filament 7 relative to the K side tube 5, so that the calibration adjustment method is more flexible and diverse, and the assembly calibration efficiency is further improved.

[0068] Preferably, the light-transmitting portion 922 is in a rectangular shape, and the width of the side of the rectangle parallel to the vertical table 924 is greater than the normal distance between the two connecting ribs 9214 .

[0069] Since the K side tube 5 is sleeved on the convex ring 9212, the flange 9211 also represents the K side tube 5 in terms of the concentricity setting. By setting the light-transmitting portion 922 to be a rectangle, the side width of the rectangle parallel to the vertical table 924 is greater than the normal distance between the two connecting ribs 9214, which is conducive to observing the full image rotation of the two connecting ribs 9214 on the projection screen 94. Through the change in the positional relationship of the full image rotation, it is conducive to further improving the efficient coordination and unity between the operator's eyes and hands, thereby improving the accuracy and efficiency of assembly calibration.

[0070] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A projection calibration tool for a magnetron cathode assembly, characterized in that: The device comprises a base (91), a workbench (92), a light source unit (93) and a projection screen (94); the workbench (92) comprises a sleeve portion (921) and a light-transmitting unit (922); the sleeve portion (921) is used for sleeve-coating a to-be-calibrated part of the cathode assembly; the projection calibration tooling of the magnetron cathode assembly further comprises a reflector group (95) for projecting the to-be-calibrated part onto the projection screen (94); the objective lens magnification of the reflector group (95) is N, wherein N>1; the sleeve portion (921) comprises a flange (9211) and a convex ring (9212) arranged along the inner side of the flange (9211); the outer diameter of the convex ring (9212) is equal to the inner diameter of the K-side tube of the to-be-calibrated part; the convex ring (9212) is hollow; and glass suction cups (96) are evenly arranged around the projection screen (94).

2. The projection calibration tool for the magnetron cathode assembly according to claim 1, characterized in that: The workbench (92) comprises a horizontal table top (923) and a vertical table top (924) arranged in an L shape, the light-transmitting portion (922) is opened on the horizontal table top (923), the light source portion (93) and the base (91) are arranged below the light-transmitting portion (922) in sequence, and the sleeve portion (921) is arranged above the light-transmitting portion (922), one end of the sleeve portion (921) is vertically connected to the vertical table top (924) and is at a certain distance from the light-transmitting portion (922).

3. The projection calibration tool for the magnetron cathode assembly according to claim 2, characterized in that: The sleeve connection portion (921) further comprises a rotating shaft seat (9213), wherein the rotating shaft seat (9213) is concentrically arranged with the flange (9211) and the convex ring (9212), and the rotating shaft seat (9213) is rotatably connected with the vertical table (924).

4. The projection calibration tool for the magnetron cathode assembly according to claim 3, characterized in that: The rotating shaft seat (9213) has a bearing built in it, and a fixed shaft is extended from one side of the vertical table surface (924) close to the horizontal table surface (923), and the bearing and the fixed shaft are both concentrically arranged with the rotating shaft seat (9213).

5. The projection calibration tool for the magnetron cathode assembly according to claim 3 or 4, characterized in that: The outer edge of the rotating shaft seat (9213) and the outer edge of the flange (9211) are fixedly connected via two connecting ribs (9214), and the normal spacing between the two connecting ribs (9214) is equal to the outer diameter of the rotating shaft seat (9213) and / or the flange (9211).

6. The projection calibration tool for the magnetron cathode assembly according to claim 5, characterized in that: The light-transmitting portion (922) is in the form of a rectangle, and the width of the side of the rectangle parallel to the vertical table surface (924) is greater than the normal distance between the two connecting ribs (9214).

7. A projection calibration process for a magnetron cathode assembly, characterized in that: A projection calibration tool for a magnetron cathode assembly as claimed in any one of claims 1 to 6, wherein the process comprises projection calibration of a filament assembly, and the specific steps are as follows: S4: Place the filament assembly into the projection calibration fixture of the magnetron cathode assembly and rotate it, and use the standard filament assembly drawing on the projection screen (94) of the projection calibration fixture as a reference to calibrate and adjust the positional relationship between the lower end cap (61), the upper end cap (8) and the filament (7) in the filament assembly, and select defective products in the filament assembly; The filament assembly comprises a pre-assembled assembly, a filament (7) and an upper end cap (8), and the pre-assembled assembly comprises a terminal assembly (1), a supporting body (2), a solder plate (3), a reflector (4), a K side tube (5), a lower end cap (61) and a long lead (62).

8. The projection calibration process of the magnetron cathode assembly according to claim 7, characterized in that: Before the projection calibration of the filament assembly, the pre-projection calibration of the pre-installed assembly is also included, and the specific steps are as follows: ST1: Place the pre-assembled component into the projection calibration fixture of the magnetron cathode component and rotate it. Using the standard filament component drawing and / or the standard pre-assembled component drawing on the projection calibration fixture projection screen (94) as a reference, perform pre-calibration adjustment on the positional relationship between the lower end cap (61) and the long lead (62) in the pre-assembled component. Perform the assembly process with the filament (7) and the upper end cap (8) on the pre-calibrated qualified pre-assembled component.

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