Coaxial transmission line with axis capable of being adjusted and centered, adjusting tool and adjusting method

Abstract

The invention aims to solve the technical problem that the axial centers of inner and outer conductors of a coaxial transmission line deviate due to size errors of a supporting piece caused by defects of a preparation process, and provides a coaxial transmission line with an adjustable and centered axial center, an adjusting tool and an adjusting method. Comprising the following steps: designing a crimping nut for connecting an inner conductor with a cathode lead rod, a tool centering block for assisting centering and an internal hexagonal wrench; the other end of the cylinder of the centering block is provided with an inner hole matched with the shaft diameter of the cathode guide rod, a plurality of through holes are formed around the inner hole, and each through hole and the inner hole are connected through a smooth inclined surface to form a guide groove; the crimping nut is internally provided with a limiting cavity and one side of the crimping nut is open, and the open side is in threaded connection with the threaded tail end of the inner conductor. A limiting hole is formed in the other side wall of the crimping nut, and a plurality of inner hexagonal flat-end jackscrews corresponding to the through holes in number and position are arranged on the periphery of the limiting hole; the cross section of the internal hexagonal wrench working section is of a regular hexagon structure, and the size and the shape of the internal hexagonal wrench working section are matched with those of the internal hexagonal flat-end jackscrew.

Description

Technical Field

[0001] The present invention relates to a coaxial transmission line, in particular to a coaxial transmission line with an adjustable center, and an adjusting tool and an adjusting method for the coaxial transmission line with an adjustable center. Background Art

[0002] Coaxial transmission lines, with their unique three-layer coaxial structural design, have demonstrated significant advantages in the field of high-voltage pulse power technology. This structure includes an inner conductor, an outer conductor tube, a cathode lead rod disposed within the outer conductor tube and connected to the inner conductor at one end, and an insulating support member supporting the inner and outer conductor tubes. The cathode lead rod is used to stabilize the axial position of the inner conductor and ensure the coaxiality of the inner and outer conductor tubes. This structure has high power carrying capacity and low high-frequency attenuation characteristics, can flexibly achieve impedance matching, and can ensure uniform electric field distribution. Therefore, coaxial transmission lines have become the core transmission components in high-voltage pulse power devices. Because there is a high potential difference between the inner conductor and the outer conductor tube of the coaxial transmission line in high-voltage pulse power devices, the insulating support member supporting the inner and outer conductor tubes needs to be made of a material with excellent insulation properties, such as alumina ceramic material.

[0003] Alumina ceramic materials have the dual advantages of low dielectric constant and high breakdown field strength, but the engineering application of alumina ceramic supports still faces technical bottlenecks for the following reasons:

[0004] On the one hand, the preparation of alumina ceramic supports relies on high-temperature sintering process. Uneven particle distribution of raw materials or fluctuations in sintering parameters will lead to inconsistent local shrinkage of the ceramic body, ultimately causing a dimensional deviation of 1% to 2%. On the other hand, alumina ceramics lack the ductility of metals and are prone to brittle fracture and damage during subsequent mechanical processing, which greatly increases the difficulty of dimensional correction.

[0005] As a result, these process defects lead to dimensional errors in the manufactured alumina ceramic support, causing the installation position of the inner conductor and the cathode lead rod connected to it to shift, which in turn causes the axial center offset between the inner and outer conductor tubes of the coaxial transmission line. For example, in an application scenario where the high-voltage pulse of a high-voltage pulse power device serves as the input source for an electron beam emitter, the axial center offset of the coaxial transmission line can further cause the electron beam emission axis of the electron beam emitter to deviate from the designed direction, seriously affecting the performance and operational stability of the electron beam emitter. Summary of the Invention

[0006] The purpose of the present invention is to solve the technical problem that the alumina ceramic support has dimensional errors due to defects in the manufacturing process of the insulating support, which causes the axial center offset of the inner conductor and the outer conductor tube of the coaxial transmission line, and to provide a coaxial transmission line with adjustable axis alignment, adjustment tooling and adjustment method.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A coaxial transmission line with adjustable axis alignment comprises an inner conductor, an outer conductor barrel, a cathode lead rod disposed within the outer conductor barrel and having one end threadedly connected to the inner conductor via a crimping nut, and an insulating support member supported between the inner conductor and the outer conductor barrel. The invention is characterized in that:

[0009] The crimping nut includes a disc-shaped nut body, one side of the nut body is open and a limiting cavity is arranged inside; the diameter of the opening is smaller than the diameter of the limiting cavity and larger than the diameter of the flange on the cathode lead rod, and a threaded section is arranged on the inner wall of the open side for connecting with the threaded end on the inner conductor; the limiting cavity is used to accommodate the flange on the cathode lead rod, and an adjustment gap is left between the inner wall of the limiting cavity and the outer wall of the flange; a limiting hole is opened in the center of the side wall of the other side of the nut body, the diameter of the limiting hole is smaller than the diameter of the opening and larger than the rod diameter of the cathode lead rod, and the gap between the outer wall of the lead rod neck of the cathode lead rod and the inner wall of the limiting hole is not less than the adjustment gap, and the size of the adjustment gap is the radial adjustment range for axial alignment of the cathode lead rod and the outer conductor tube; a plurality of hexagonal flat-end top screws are evenly arranged on the nut body around the outer circumference of the limiting hole, for fastening the flange on the cathode lead rod in the limiting cavity.

[0010] Furthermore, the axial length of the limiting cavity of the compression nut is greater than the thickness of the flange on the cathode lead rod;

[0011] Definition: The axial length of the limiting cavity is L, and the thickness of the flange of the cathode lead rod is l, both in millimeters. Then, 0.3≤Ll≤0.5. This gap can minimize the deflection angle between the cathode lead rod and the axis of the outer conductor tube while allowing the flange of the cathode lead rod to move radially and smoothly in the limiting cavity of the crimping nut.

[0012] Furthermore, it is defined that the diameter of the limiting cavity is M1, the diameter of the flange is M2, and the adjustment gap is ΔM, with the unit being millimeters, then: ΔM=1 / 2(M1-M2), 0≤ΔM≤10.

[0013] Furthermore, it is defined that: the difference between the rod diameter of the lead rod neck of the cathode lead rod and the diameter of the limiting hole is m, then m≤Ll.

[0014] Furthermore, a straight mouth is provided at the threaded end of the inner conductor to prevent the crimping nut connected thereto from loosening, and to ensure that the axial length of the limiting cavity of the crimping nut is slightly longer than the thickness of the flange of the cathode lead rod after the thread is fixed, so that the flange of the cathode lead rod can move radially and smoothly in the limiting cavity of the crimping nut.

[0015] At the same time, the present invention also provides an adjustment tool for the above-mentioned coaxial transmission line with adjustable axis alignment; the special feature of the tool is that it includes:

[0016] Centering block and Allen wrench;

[0017] The centering block is composed of a cylinder and a push rod vertically connected to one end of the cylinder, and the other end of the cylinder is provided with an inner hole along the central axis, the size of the inner hole is adapted to the rod diameter of the cathode lead rod, and the outer diameter of the cylinder is adapted to the inner diameter of the flange end of the outer conductor tube; a plurality of through holes are uniformly opened on the cylinder along the axial direction around the inner hole, and the number of the plurality of through holes is the same as the number of the plurality of hexagonal flat-end top screws, and the positions correspond one to one; the outer end of the inner hole is provided with a tapered surface with the large end facing outward, and a notch of the same shape and size is formed between the tapered surface and the inner sides of the plurality of through holes, and the tapered surface constitutes a guide groove;

[0018] The hexagonal wrench includes a horizontal gripping portion and a longitudinal working portion; the longitudinal working portion includes an integrally formed connecting section and a working section, one end of the connecting section is vertically connected to the middle position of the horizontal gripping portion, and the other end is connected to the working section; the cross-section of the connecting section is larger than the cross-section of the working section, and the cross-section of the working section is a regular hexagonal structure, and the size and shape match the hexagonal flat-end top screw.

[0019] Furthermore, the centering block and the flange end of the outer conductor tube are matched with a base hole axis, and the matching accuracy is H7 / g6;

[0020] The inner hole of the centering block and the rod body of the cathode lead rod are matched with each other using a basic hole-making axis, and the matching accuracy is H7 / g6.

[0021] Furthermore, the inner hole is a blind hole.

[0022] Furthermore, the centering block is made of brass.

[0023] Furthermore, the hexagonal wrench is T-shaped as a whole.

[0024] At the same time, the present invention also provides an adjustment method, which uses the above-mentioned adjustment tool for the above-mentioned coaxial transmission line with adjustable axis alignment; the special feature of the method is that it includes the following steps:

[0025] S1. Insert the cathode lead rod into the opening of the compression nut and extend it out of the limiting hole of the compression nut, so that the flange on the cathode lead rod is located in the limiting cavity of the compression nut;

[0026] S2, fastening the compression nut with the cathode lead rod to the threaded end of the inner conductor through the threaded section on the open side;

[0027] S3, inserting the centering block from the flange end of the outer conductor tube, guiding the cathode lead rod into the inner hole of the centering block through the guide groove of the centering block, so that the cathode lead rod is aligned with the axis of the outer conductor tube;

[0028] S4. Insert the hexagonal wrench from the flange end of the outer conductor tube, pass it through any through hole on the centering block, and adjust the hexagonal flat-end screw on the compression nut corresponding to the through hole until the hexagonal flat-end screw is inserted into the limiting cavity of the compression nut and tightens the flange on the cathode lead rod;

[0029] S5. Use the hexagonal wrench to adjust all other hexagonal flat-end screws on the centering block until all the hexagonal flat-end screws are pressed tightly against the flange on the cathode lead rod, so that the side of the cathode lead rod flange away from the cathode lead rod body is in close contact with the end face of the inner conductor;

[0030] S6. Take out the hexagonal wrench and use the push rod to remove the centering block from the flange end of the outer conductor tube to complete the axis centering adjustment of the coaxial transmission line.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The present invention relates to a coaxial transmission line with adjustable axis centering. One end of the cathode lead rod is positioned by a compression nut designed to accommodate a cathode lead rod flange. A plurality of inner hexagonal flat-end top screws are provided on the compression nut. The adjustment gap between the inner wall of the limiting cavity and the outer wall of the flange, as well as the gap between the outer wall of the lead rod neck of the cathode lead rod and the inner wall of the limiting hole, are provided so that the cathode lead rod and the outer conductor tube have an adjustment gap for axis centering. The plurality of hexagonal flat-end top screws can be adjusted by using corresponding tools so that the hexagonal flat-end top screws can fix the angle of the cathode lead rod flange to achieve axis centering. The structure is simple.

[0033] (2) The present invention provides a coaxial transmission line with adjustable axis centering, which connects the cathode lead rod to the inner conductor by using a compression nut with multiple adjustable inner hexagonal flat-end top screws. By designing the diameter difference between the flange of the cathode lead rod and the limiting cavity of the compression nut, the line has the characteristics of a large radial adjustment range, and the axial length of the limiting cavity of the compression nut is greater than the thickness of the flange of the cathode lead rod. While minimizing the axial center offset angle between the cathode lead rod and the outer conductor tube, the flange of the cathode lead rod can move radially and smoothly in the limiting cavity of the compression nut. This can solve the problem of axial center offset of the inner and outer conductors of the coaxial transmission line caused by the engineering problem of the inner and outer surfaces not being in axial alignment after sintering of alumina ceramics.

[0034] (3) The present invention provides an adjustment tool, which assists in aligning the cathode lead rod with the outer conductor tube axis by designing a centering block with an inner hole size adapted to the cathode lead rod body, and evenly arranges multiple through holes around the inner hole so that a hexagonal wrench can pass through the through holes to adjust the multiple hexagonal flat-end top screws on the crimping nut to perform axis centering adjustment, thereby avoiding axis deviation of the coaxial transmission line caused by dimensional errors due to defects in the manufacturing process of the insulating support member. The tool has a simple structure and is easy to operate;

[0035] (4) The present invention has a high centering accuracy feature, which can reach 0.05-0.1 mm, by adjusting the tooling design to ensure the accuracy of the hole-axis fit between the centering block and the flange end of the outer conductor tube, and between the inner hole of the centering block and the cathode lead rod.

[0036] (5) The present invention provides an adjustment method, which adjusts the axial centering of the cathode lead rod and the outer conductor tube by using a centering block, and then uses an internal hexagonal wrench to pass through the through hole designed on the centering block to adjust the multiple internal hexagonal flat-end top screws on the crimping nut connecting the inner conductor and the cathode lead rod in turn, so that the flange is crimped on the end face of the inner conductor. After fixing, the centering block and the internal hexagonal wrench are recovered to complete the axial centering of the coaxial transmission line. The centering method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic cross-sectional view of a coaxial transmission line embodiment of the present invention with adjustable axis centering, using an adjustment tool embodiment of the present invention when performing coaxial adjustment;

[0038] Figure 2 A cross-sectional view of a compression nut in an embodiment of a coaxial transmission line with adjustable axis alignment according to the present invention;

[0039] Figure 3 This is a schematic diagram of the three-dimensional structure of a cathode lead rod in an embodiment of a coaxial transmission line with adjustable axis centering according to the present invention;

[0040] Figure 4 This is a schematic diagram of the three-dimensional structure of the centering block in an embodiment of the adjusting tool of the present invention;

[0041] Figure 5 This is a schematic diagram of the three-dimensional structure of a hexagonal wrench in an embodiment of an adjustment tool of the present invention.

[0042] In the figure: 1-centering block, 2-pressing nut, 3-hexagonal wrench, 4-push rod, 5-inner hole, 6-through hole, 7-guide groove, 8-limiting cavity, 9-threaded section, 10-limiting hole, 11-hexagonal flat-end top screw, 12-cathode lead rod, 13-flange, 14-inner conductor, 15-outer conductor tube, 16-insulating support, 17-lead rod neck. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 As shown, this embodiment provides a coaxial transmission line with adjustable axis centering, including an inner conductor 14, an outer conductor tube 15, a cathode lead rod 12 disposed in the outer conductor tube 15 and connected to the inner conductor 14 at one end, and an insulating support 16 supported between the inner conductor 14 and the outer conductor tube 15. The structure of the cathode lead rod 12 is as shown in FIG. Figure 3 As shown;

[0045] In order to realize the adjustable centering of the coaxial transmission line, a compression nut 2 is designed to connect and fix the cathode lead rod 12 and the inner conductor 14; and the structure of the compression nut 2 is as follows: Figure 2 As shown, it includes a disc-shaped nut body, one side of the nut body is open and a limiting cavity 8 is provided inside for accommodating the flange 13 on the cathode lead rod 12; the diameter of the opening is smaller than the diameter of the limiting cavity 8, and the diameter of the opening is larger than the diameter of the flange 13 on the cathode lead rod 12, so that the flange 13 can pass through the opening into the limiting cavity 8; a threaded segment 9 for connecting with the threaded end of the inner conductor 14 is provided on the inner wall of the opening side of the nut body, and the inner wall provided with the threaded segment 9 is connected to the inner wall of the limiting cavity 8 through a stepped structure; the thread A limiting hole 10 is opened at the center of the side wall on the other side of the mother body. The diameter of the limiting hole 10 is smaller than the diameter of the opening and larger than the diameter of the rod body of the cathode lead rod 12, so that the rod body of the cathode lead rod 12 can pass through the limiting hole 10 smoothly and limit the cathode lead rod 12 at the same time. The axial diameter of the lead rod neck 17 between the rod body of the cathode lead rod 12 and the flange 13 is smaller than the diameter of the limiting hole 10, and the difference between the two is m, then m≤Ll; a plurality of hexagonal flat-end top screws 11 are evenly arranged on the nut body around the outer periphery of the limiting hole 10.

[0046] Among them, the diameter of the limiting cavity 8 is M1, and the diameter of the flange 13 on the cathode lead rod 12 is M2. There is a difference between the two, which is the radial adjustment gap ΔM of the cathode lead rod 12 axial center, the unit is millimeter, then ΔM=1 / 2(M1-M2), and 0≤ΔM≤10; and the axial length of the limiting cavity 8 is L, and the thickness of the flange 13 is l, the unit is millimeter, then 0.3≤Ll≤0.5, that is, there is a gap, this gap can minimize the deflection angle of the cathode lead rod 12 and the axis of the outer conductor tube 15 while allowing the flange 13 of the cathode lead rod 12 to move radially and smoothly in the limiting cavity 8.

[0047] In order to facilitate the axis centering adjustment of the coaxial transmission line with adjustable axis centering, this embodiment provides an adjustment tool, including a centering block 1 and an Allen wrench 3, the specific structures of which are as follows:

[0048] like Figure 4 As shown, the centering block 1 is composed of a cylinder and two push rods 4 vertically connected to one end of the cylinder, the two push rods 4 are symmetrically distributed, and an inner hole 5 is provided along the center axis at the other end of the cylinder. The size of the inner hole 5 is adapted to the rod diameter of the cathode lead rod 12, and a plurality of through holes 6 are uniformly opened axially around the inner hole 5 on the cylinder, and the number of the plurality of through holes 6 is the same as the number of the plurality of hexagonal flat-end top screws 11 on the above-mentioned crimping nut 2, and the positions correspond one to one; the outer end of the inner hole 5 is provided with a conical surface with the large end facing outward, and a notch of the same shape and size is formed between the conical surface and the inner sides of the plurality of through holes, and the conical surface constitutes a guide groove 7.

[0049] Among them, the centering block 1 is made of brass material, which has a lower hardness than the material of the cathode lead rod 12. It is not easy to wear the outer surface of the cathode lead rod 12 during the axis centering adjustment process, avoiding the risk of field emission on the outer surface of the cathode lead rod 12 due to wear such as surface scratches.

[0050] The centering block 1 and the flange end of the outer conductor tube 15 are matched with the base hole axis, and the matching accuracy is H7 / g6; the inner hole 5 of the centering block 1 and the cathode lead rod 12 are matched with the base hole axis, and the matching accuracy is H7 / g6.

[0051] like Figure 5 As shown, the hexagonal wrench 3 is T-shaped as a whole, including a horizontal gripping portion and a longitudinal working portion; the longitudinal working portion includes an integrally formed connecting section and a working section, the connecting section is vertically connected to the middle position of the horizontal gripping portion, and the other end is connected to the working section; the cross-section of the connecting section is larger than the cross-section of the working section, and the cross-section of the working section is a regular hexagonal structure and the size and shape match the hexagonal flat-end top screw 11.

[0052] This embodiment provides an adjustment method, which uses the above-mentioned adjustment tool for the above-mentioned coaxial transmission line with adjustable axis alignment; the method includes the following steps:

[0053] S1. Insert the cathode lead rod 12 through the opening of the crimping nut 2 and extend it out from the limiting hole 10 of the crimping nut 2 so that the flange 13 on the cathode lead rod 12 is located within the limiting cavity 8 of the crimping nut 2. The radial adjustment range of the axis center of the cathode lead rod 12 is designed to be ±5 mm, wherein the diameter of the flange 13 of the cathode lead rod 12 is 64 mm, and the diameter of the limiting cavity 8 of the crimping nut 2 is 74 mm.

[0054] S2. Connect and fasten the compression nut 2 with the cathode lead rod 12 to the threaded end of the inner conductor 14 through the threaded section 9 on the open side, wherein the threaded end of the inner conductor 14 is provided with a straight mouth with a depth of 3 mm, which can make the compression nut 2 not easy to loosen after being threadedly connected to the inner conductor 14, and ensure that the axial length of the limiting cavity 8 of the compression nut 2 is slightly longer than the thickness of the flange 13 on the cathode lead rod 12 by 0.3 mm. This gap can minimize the deflection angle of the cathode lead rod 12 and the axis while allowing the flange 13 of the cathode lead rod 12 to move radially and silkily in the limiting cavity 8 of the compression nut 2;

[0055] S3. Insert the centering block 1 from the flange end of the outer conductor tube 15, and guide the cathode lead rod 12 into the inner hole 5 of the centering block 1 through the guide groove 7 of the centering block 1. The centering block 1 and the flange end of the outer conductor tube 15 are matched with the base hole axis, with a matching accuracy of H7 / g6; the inner hole 5 of the centering block 1 and the rod body of the cathode lead rod 12 are matched with the base hole axis, with a matching accuracy of H7 / g6; so that the cathode lead rod 12 and the axis of the outer conductor tube 15 are aligned, and the alignment accuracy can reach 0.05-0.1mm;

[0056] S4. Insert the hexagonal wrench 3 from the flange end of the outer conductor tube 15 through any through hole 6 on the centering block 1, and adjust the corresponding hexagonal flat-end screw 11 on the compression nut 2 until the hexagonal flat-end screw 11 extends into the limiting cavity 8 of the compression nut 2 and tightens the flange 13 on the cathode lead rod 12;

[0057] S5. Use the hexagonal wrench 3 to adjust all other hexagonal flat-end screws 11 on the centering block 1 until all the hexagonal flat-end screws 11 are pressed tightly against the flange 13 on the cathode lead rod 12, so that the side of the flange 13 of the cathode lead rod 12 away from the rod body of the cathode lead rod 12 is in close contact with the end face of the threaded end of the inner conductor 14;

[0058] S6. Take out the hexagonal wrench 3 and remove the centering block 1 from the flange end of the outer conductor tube 15 through the push rod 4 to complete the axis centering adjustment of the coaxial transmission line.

[0059] The above are only embodiments of the present invention and are not intended to limit the present invention. For ordinary professionals in this field, the present invention can have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the technical solution of the present invention should be included in the protection scope of the present invention. In addition, it should be noted that the drawings are only for example, they are not drawn according to the conditions of equal proportion, and should not be used as a limitation to the actual scope of protection required by the present invention.

Claims

1. A coaxial transmission line with adjustable axis centering, comprising an inner conductor (14), an outer conductor barrel (15), a cathode lead rod (12) disposed in the outer conductor barrel (15) and having one end threadedly connected to the inner conductor (14) via a crimping nut (2), and an insulating support member (16) supported between the inner conductor (14) and the outer conductor barrel (15); characterized in that: The crimping nut (2) comprises a disc-shaped nut body, one side of which is open and a limiting cavity (8) is provided inside the nut body; the diameter of the opening is smaller than the diameter of the limiting cavity (8) and larger than the diameter of the flange (13) on the cathode lead rod (12); a threaded section (9) is provided on the inner wall of the opening side for connecting with the threaded end on the inner conductor (14); the limiting cavity (8) is used to accommodate the flange (13) on the cathode lead rod (12), and an adjustment space is left between the inner wall of the limiting cavity (8) and the outer wall of the flange (13). The nut body has a limit hole (10) at the center of the other side wall, the diameter of the limit hole (10) is smaller than the diameter of the opening and larger than the diameter of the cathode lead rod (12), and the gap between the outer wall of the lead rod neck (17) of the cathode lead rod (12) and the inner wall of the limit hole (10) is not smaller than the adjustment gap; a plurality of hexagonal flat-end top screws (11) are evenly arranged on the nut body around the outer periphery of the limit hole (10) for fastening the flange (13) on the cathode lead rod (12) in the limit cavity (8).

2. The coaxial transmission line with adjustable axis centering according to claim 1, characterized in that: The axial length of the limiting cavity (8) of the press-fit nut (2) is greater than the thickness of the flange (13) on the cathode lead rod (12); Definition: The axial length of the limiting cavity (8) is L, and the thickness of the flange (13) of the cathode lead rod (12) is l, and the unit is millimeter, then 0.3≤Ll≤0.

5.

3. The coaxial transmission line with adjustable axis centering according to claim 2, characterized in that: Definition: The diameter of the limiting cavity (8) is M1, the diameter of the flange (13) is M2, and the adjustment gap is ΔM, the unit is millimeter, then: ΔM=1 / 2(M1-M2), 0≤ΔM≤10.

4. The coaxial transmission line with adjustable axis centering according to claim 3, characterized in that: Definition: The difference between the rod diameter of the lead rod neck (17) of the cathode lead rod (12) and the diameter of the limiting hole (10) is m, then m≤Ll.

5. The coaxial transmission line with adjustable axis centering according to claim 1, characterized in that: The threaded end of the inner conductor (14) is provided with a straight opening for preventing the crimping nut (2) connected thereto from loosening.

6. An adjustment tool for a coaxial transmission line with adjustable centering according to any one of claims 1 to 5; characterized in that: include: Centering block (1) and hexagonal wrench (3); The centering block (1) is composed of a cylinder and a push rod (4) vertically connected to one end of the cylinder, and an inner hole (5) is provided at the other end of the cylinder along the central axis, the size of the inner hole (5) is adapted to the rod diameter of the cathode lead rod (12), and the outer diameter of the cylinder is adapted to the inner diameter of the flange end of the outer conductor tube (15); a plurality of through holes (6) are uniformly opened on the cylinder along the axial direction around the inner hole (5), the number of the plurality of through holes (6) is the same as the number of the plurality of hexagonal flat-end top screws (11), and the positions correspond one to one; the outer end of the inner hole (5) is provided with a tapered surface with the large end facing outward, and a notch of the same shape and size is formed between the tapered surface and the inner sides of the plurality of through holes (6), and the tapered surface forms a guide groove (7); The hexagonal wrench (3) comprises a transverse gripping portion and a longitudinal working portion; the longitudinal working portion comprises an integrally formed connecting section and a working section, one end of the connecting section is vertically connected to the middle position of the transverse gripping portion, and the other end is connected to the working section; the cross section of the connecting section is larger than the cross section of the working section, the cross section of the working section is a regular hexagonal structure, and the size and shape match the hexagonal flat-end top screw (11).

7. The adjusting tool according to claim 6, characterized in that: The centering block (1) and the flange end of the outer conductor tube (15) are matched with each other using a basic hole-making axis, and the matching accuracy is H7 / g6; The inner hole (5) of the centering block (1) and the rod body of the cathode lead rod (12) are matched with each other using a basic hole-making axis, and the matching accuracy is H7 / g6.

8. The adjusting tool according to claim 6, characterized in that: The inner hole (5) is a blind hole.

9. The adjusting tool according to claim 6, characterized in that: The centering block (1) is made of brass material.

10. An adjustment method, using an adjustment tool as claimed in any one of claims 6 to 9, for a coaxial transmission line with adjustable axis centering as claimed in any one of claims 1 to 5; characterized in that: The following steps are involved: S1. Insert the body of the cathode lead rod (12) through the opening of the crimping nut (2) and extend it out from the limiting hole (10) of the crimping nut (2), so that the flange (13) on the cathode lead rod (12) is located in the limiting cavity (8) of the crimping nut (2); S2, connecting and fastening the compression nut (2) with the cathode lead rod (12) to the threaded end of the inner conductor (14) through the threaded section (9) on the open side; S3, inserting the centering block (1) from the flange end of the outer conductor tube (15), guiding the rod body of the cathode lead rod (12) into the inner hole (5) of the centering block (1) through the guide groove (7) of the centering block (1), so that the cathode lead rod (12) and the axis of the outer conductor tube (15) are aligned; S4, insert the hexagonal wrench (3) from the flange end of the outer conductor tube (15), pass through any through hole (6) on the centering block (1), and adjust the hexagonal flat-end top screw (11) on the crimping nut (2) corresponding to the position of the through hole (6) until the hexagonal flat-end top screw (11) extends into the limiting cavity (8) of the crimping nut (2) and tightens the flange (13) on the cathode lead rod (12); S5. Adjust all other hexagonal flat-end screws (11) on the centering block (1) by using the hexagonal wrench (3) until all the hexagonal flat-end screws (11) are pressed against the flange (13) on the cathode lead rod (12), so that the flange (13) of the cathode lead rod (12) is in close contact with the end face of the inner conductor (14) on the side away from the rod body of the cathode lead rod (12); S6. Take out the hexagonal wrench (3) and remove the centering block (1) from the flange end of the outer conductor tube (15) through the push rod (4), completing the axis centering adjustment of the coaxial transmission line.

Images