CN111697309A

CN111697309A - Cavity filter resonant rod assembling method based on limiting tool

Info

Publication number: CN111697309A
Application number: CN202010691769.8A
Authority: CN
Inventors: 潘永; 徐克兴; 谭尊林
Original assignee: Dfine Technology Co Ltd
Current assignee: Dfine Technology Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-09-22

Abstract

The invention discloses a limiting tool-based cavity filter resonant rod assembling method, which is characterized in that an assembling limiting tool is adopted for installing a resonant rod, the assembling limiting tool comprises a limiting plate with the length consistent with the length of the internal space of a filter shell, a plurality of identical arched limiting grooves are formed in the limiting plate, a comb-shaped structure is formed in the limiting plate, the number of the arched limiting grooves is identical to that of the resonant rods in a cavity filter, and the arched limiting grooves and the resonant rods in the cavity filter are in one-to-one correspondence, and the method comprises the following steps: opening a cover plate on the front side or the rear side of the filter shell; the limiting plates are sent into the filter shell, so that each resonance rod to be assembled in the limiting plates enters the top of the corresponding arched limiting groove; under the limiting action of the arched limiting groove, the assembly of the resonance rod and the filter shell is completed through the screws; and taking out the limiting plate, and mounting the cover plate to obtain the assembled cavity filter. The invention effectively avoids the deviation of the resonance rod in the assembling process.

Description

Cavity filter resonant rod assembling method based on limiting tool

Technical Field

The invention relates to assembly of a cavity filter, in particular to a method for assembling a resonant rod of the cavity filter based on a limiting tool.

Background

The internal structure of the conventional filter comprises a shell, a resonance rod, an assembly screw, a tuning screw nut and the like; because screw and resonance rod, there is certain deviation in the processing of resonance rod and casing, screw and casing etc. when cavity filter inside adoption countersunk screw installation resonance rod, consequently when the assembly, the processing deviation can lead to the fit-up gap, can't guarantee the design interval of resonance rod when leading to the assembly to coupling coefficient between the unable assurance filter resonance rod leads to the deviation to the wave filter index to appear.

The cavity filter that corresponds the resonance bar is longer, because the weight of resonance bar self, volume etc. the probability that the skew appears in the resonance bar is great when the assembly, and this problem is especially outstanding, simultaneously, because the resonance bar is the cylinder structure, the resonance bar can follow the condition that the screw tightening direction rotated in step during the assembly, adopts the precision that manual assembly is more difficult to ensure among the assembling process under the condition of instruments such as instrument not having.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a cavity filter resonant rod assembling method based on a limiting tool, and effectively avoids the deviation of a resonant rod in the assembling process.

The purpose of the invention is realized by the following technical scheme: a cavity filter resonance rod assembly method based on a limiting tool adopts the assembly limiting tool to install the resonance rod, and is characterized in that: the assembly limiting tool comprises a limiting plate which is consistent with the length of the inner space of the filter shell, a plurality of identical arched limiting grooves are formed in the limiting plate, a comb-shaped structure is formed, the number of the arched limiting grooves is identical to that of the resonant rods in the cavity filter, and the arched limiting grooves and the resonant rods in the cavity filter correspond to each other one by one, and the method comprises the following steps:

opening a cover plate on the front side or the rear side of the filter shell;

the limiting plates are sent into the filter shell, so that each resonance rod to be assembled in the limiting plates enters the top of the corresponding arched limiting groove;

under the limiting action of the arched limiting groove, the assembly of the resonance rod and the filter shell is completed through the screws;

and taking out the limiting plate, and mounting the cover plate to obtain the assembled cavity filter.

Preferably, the inner wall of the semicircular part of the limiting groove is provided with a saw-toothed protrusion.

The invention has the beneficial effects that: the invention avoids the deviation of the resonance rod in the assembling process, designs the inner side of the arch into a sawtooth shape at the arch position to ensure the friction force of the resonance rod, and reserves enough space to prevent the resonance rod from synchronously rotating along the screwing direction of the screw while ensuring the limit.

Drawings

FIG. 1 is a schematic structural diagram of a limiting plate;

FIG. 2 is a schematic structural view of a limiting groove;

FIG. 3 is a flow chart of a method of the present invention;

FIG. 4 is a front view of the assembly process;

FIG. 5 is a top cross-sectional view of the assembly process;

in the figure, 1-limiting plate, 2-arched limiting groove, 3-rectangular part, 4-semicircular part, 5-filter shell, 6-resonance rod and 7-sawtooth-shaped bulge.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

A cavity filter resonance rod assembly method based on a limiting tool is characterized in that the resonance rod is installed by the aid of the limiting tool, as shown in figures 1-2, the limiting tool comprises a limiting plate 1 which is consistent with the length of an inner space of a filter shell 5, a plurality of identical arched limiting grooves 2 are formed in the limiting plate 1 and form a comb-shaped structure, the arched limiting grooves 2 are identical to and in one-to-one correspondence with resonance rods 6 in a cavity filter in number, and the limiting grooves 2 are integrally arched and are formed by a bottom rectangular part 3 and a top semicircular part 4; the height of the whole rectangular groove is half of the height of the limiting plate. The width of the rectangular part 3, the inner diameter of the semicircular part 4 and the outer diameter of the resonance rod to be installed are consistent in size. The spacing between any two adjacent limiting grooves 2 is equal to the specified spacing between adjacent resonant rods. The inner wall of the semicircular part 4 of the limiting groove 2 is provided with a sawtooth-shaped bulge 7.

As shown in fig. 3, the method comprises the steps of:

opening a cover plate on the front side or the rear side of the filter shell;

as shown in fig. 4-5, the limiting plates 1 are sent into the filter housing, so that each resonance rod 6 to be assembled in the limiting plates 1 enters the top of the corresponding arched limiting groove 2;

under the limiting action of the arched limiting groove 2, the resonant rod 6 and the filter shell 5 are assembled through screws;

and taking out the limiting plate 1, and mounting a cover plate to obtain the assembled cavity filter.

According to the invention, through the limiting effect of the limiting groove, the position and the relative distance of the resonance rod can be strictly limited in the assembling process, and deviation caused by factors such as the weight and the volume of the resonance rod can be avoided; in order to ensure the friction force of the resonance rod at the arched position, the inner side of the arch is designed to be zigzag, so that enough space is reserved to prevent the resonance rod from synchronously rotating along the screwing direction of the screw while the limit is ensured; the cavity filter assembled by the method can meet the assembly precision of the cavity filter, and simultaneously avoids the condition that the resonant rods can synchronously rotate along the screwing direction of the screws in the assembly process of the cavity filter, the comb-shaped tool is adopted to ensure the distance between the resonant rods, the coupling coefficient of the cavity filter is ensured, the assembly error of the cavity filter is obviously reduced, and the one-time success rate of assembly and debugging is improved to more than 95 percent from the original 70 percent.

The foregoing is a preferred embodiment of the present invention, it is to be understood that the invention is not limited to the form disclosed herein, but is not to be construed as excluding other embodiments, and is capable of other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A cavity filter resonance rod assembly method based on a limiting tool adopts the assembly limiting tool to install the resonance rod, and is characterized in that: the assembly limiting tool comprises a limiting plate (1) which is consistent with the length of the inner space of a filter shell (5), a plurality of identical arched limiting grooves (2) are formed in the limiting plate (1) and form a comb-shaped structure, the number of the arched limiting grooves (2) is identical to that of resonant rods (6) in a cavity filter, and the arched limiting grooves correspond to the resonant rods one by one, and the method comprises the following steps:

opening a cover plate on the front side or the rear side of the filter shell;

the limiting plates (1) are sent into the filter shell, so that each resonance rod (6) to be assembled in the limiting plates (1) enters the top of the corresponding arched limiting groove (2);

under the limiting action of the arched limiting groove (2), the resonant rod (6) and the filter shell (5) are assembled through screws;

and taking out the limiting plate (1), and mounting a cover plate to obtain the assembled cavity filter.

2. The assembly method of the cavity filter resonance rod based on the limiting tool according to claim 1, characterized in that: the limiting groove (2) is integrally arched and consists of a rectangular part (3) at the bottom and a semicircular part (4) at the top; the height of the whole rectangular groove is half of the height of the limiting plate.

3. The assembly method of the cavity filter resonance rod based on the limiting tool according to claim 2, characterized in that: the width of the rectangular part (3), the inner diameter of the semicircular part (4) and the outer diameter of the resonance rod to be installed are consistent in size.

4. The assembly method of the cavity filter resonance rod based on the limiting tool according to claim 1, characterized in that: the distance between any two adjacent limiting grooves (2) is equal to the specified distance between the adjacent resonant rods.

5. The assembly method of the cavity filter resonance rod based on the limiting tool according to claim 1, characterized in that: the inner wall of the semicircular part (4) of the limit groove (2) is provided with a sawtooth-shaped bulge (7).