A manual tuning aid mechanism for a cavity filter

Abstract

The utility model discloses a kind of manual debugging auxiliary mechanism of cavity filter, including debugging cover plate and debugging screwdriver;Auxiliary positioning hole is opened in debugging cover plate, the auxiliary positioning hole of debugging cover plate is consistent with the tuning screw rod arrangement of filter cover plate, debugging cover plate is parallelly arranged with filter cover plate;Debugging cover plate is located just above the filter cover plate, and the auxiliary positioning hole of debugging cover plate overlaps with the tuning screw rod of filter cover plate;Debugging screwdriver includes handle, scale shaft, sword shaft and tool bit in length direction in sequence, sword shaft is set with the adaptation auxiliary positioning hole, the top of debugging cover plate is extended and is provided with the first positioning slot of adaptation scale shaft, the first positioning slot is annular groove set around auxiliary positioning hole, scale mark is set on scale shaft, scale mark is set on scale shaft, cooperate first positioning slot top surface to form reading datum, can be directly read depth, without relying on pitch conversion, solve the problem of no intuitive quantization of adjustment amount.

Description

Technical Field

[0001] This utility model relates to the field of cavity filter technology, and in particular to a manual adjustment auxiliary mechanism for cavity filters. Background Technology

[0002] Cavity filters, as key devices in the field of radio frequency communication, optimize filtering performance by adjusting the depth of their internal tuning screws, ensuring low-loss transmission of in-band signals and filtering out out-of-band interference. The depth accuracy of the tuning screw directly determines key parameters of the filter, such as center frequency and bandwidth; therefore, precise adjustment is required during production and debugging.

[0003] In the prior art, specialized auxiliary devices have emerged for adjusting tuning screws. For example, the utility model patent with authorization announcement number CN211629274U discloses a tuning screw depth adjustment device. This device, by setting an adjustment cover plate that matches the arrangement of tuning screws on the filter cover plate, allows the adjustment screwdriver to accurately align with the tuning screw without repeated alignment. This solves to some extent the problem of cumbersome and inefficient alignment of the screwdriver and the screw in traditional manual adjustment. At the same time, it ensures the relative position of the adjustment cover plate and the filter cover plate by fixing the screw or the adjustment cover plate fixing bracket, thus improving positioning stability.

[0004] However, the aforementioned existing technologies still have obvious limitations: First, the adjustment amount of the screwdriver lacks intuitive quantitative indicators. Although some solutions record the rotation angle through a marking mechanism or rely on the electric screwdriver to record the number of turns, time, and speed, the conversion between angle and depth depends on the pitch parameter. Second, the axial limit of the auxiliary positioning hole is limited, and in order to facilitate the passage of the screwdriver shaft, there is a certain gap between the shaft and the auxiliary positioning hole, which may lead to accuracy deviation during fine adjustment. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a manual adjustment auxiliary mechanism for cavity filters. The scale axis is marked with scale marks, which, together with the top surface of the first positioning groove, form a reading reference. The depth can be read directly without relying on pitch conversion, thus solving the problem of no intuitive quantification of adjustment amount.

[0006] Technical solution:

[0007] A manual adjustment auxiliary mechanism for a cavity filter includes an adjustment cover plate and an adjustment screwdriver. The adjustment cover plate has an auxiliary positioning hole, which is aligned with the tuning screw of the filter cover plate. The adjustment cover plate is parallel to the filter cover plate. The adjustment cover plate is located directly above the filter cover plate, and the auxiliary positioning hole overlaps with the tuning screw. The adjustment screwdriver passes through the auxiliary positioning hole and the tuning screw from top to bottom, adjusting the depth of the tuning screw at the corresponding position on the filter cover plate. The adjustment screwdriver includes a handle, a scale shaft, a cutter shaft, and a cutter head along its length. The cutter shaft is adapted to the auxiliary positioning hole. The top of the adjustment cover plate extends upwards to form a first positioning groove adapted to the scale shaft. The first positioning groove is an annular groove surrounding the auxiliary positioning hole. The length of the scale shaft is greater than the depth of the first positioning groove, and the scale shaft has graduation markings.

[0008] Furthermore, the lower end of the debugging cover plate extends downward to provide a second positioning groove. The second positioning groove is an annular groove surrounding the auxiliary positioning hole. The diameter of the second positioning groove is the same as that of the auxiliary positioning hole. The diameter of the cutter shaft matches the diameter of the second positioning groove and the diameter of the auxiliary positioning hole.

[0009] Furthermore, the scale markings include large scale lines arranged in a ring and small scale lines equidistantly distributed along the circumferential and axial directions of the scale axis.

[0010] Furthermore, the spacing between adjacent minimum scale lines is 0.1 mm, the width of the minimum scale line is 0.1 mm, the spacing between adjacent maximum scale lines is 0.5 or 1 mm, and the scale lines are painted with black or red paint.

[0011] Furthermore, the scale markings on the adjustment screwdriver's axis at the adjustment time form a reading reference line with the edge of the top surface of the first positioning groove.

[0012] Furthermore, the total length of the scale markings is greater than the maximum stroke of the tuning screw, and the zero point of the scale markings on the scale axis is exactly flush with the top surface of the first positioning groove when the adjusting screw abuts against the tuning screw at the highest position.

[0013] Furthermore, the upper end of the filter cover is provided with multiple positioning holes, and the lower end of the debugging cover is provided with positioning posts corresponding to the positioning holes.

[0014] Furthermore, the positioning hole and the positioning post are magnetically coupled; an iron sheet is embedded at the bottom of the positioning hole, and a permanent magnet is embedded at the end of the positioning post.

[0015] Beneficial effects: The scale axis is marked with scale markings, which, together with the top surface of the first positioning groove, form a reading reference, allowing direct reading of depth without relying on pitch conversion, thus solving the problem of no intuitive quantification of adjustment amount; the auxiliary positioning hole and the second positioning groove simultaneously match the cutter shaft to form a double limit, which, together with the first positioning groove, limits the radial movement of the adjusting screw at multiple positions along the length direction, ensuring the accuracy of the scale corresponding to the depth and improving adjustment precision. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a perspective view of the debugging cover plate of this utility model;

[0018] Figure 3 This is a three-dimensional view of the cavity filter of this utility model;

[0019] Figure 4 This is a perspective view of the present invention after the adjustment cover has been removed;

[0020] Figure 5 This is a cross-sectional view of the scale markings of this utility model. Detailed Implementation

[0021] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1-5As shown, a manual adjustment auxiliary mechanism for a cavity filter includes an adjustment cover plate 1 and an adjustment screwdriver 2. The adjustment cover plate 1 has an auxiliary positioning hole 11, which is aligned with the tuning screw 31 of the filter cover plate 3. The adjustment cover plate 1 and the filter cover plate 3 are arranged parallel to each other. The adjustment cover plate 1 is located directly above the filter cover plate 3, and the auxiliary positioning hole 11 of the adjustment cover plate 1 overlaps with the tuning screw 31 of the filter cover plate. The adjustment screwdriver 2 passes through the auxiliary positioning hole 11 and the tuning screw from top to bottom. 31. Adjusting the depth of the tuning screw at the corresponding position of the filter cover plate, characterized in that the tuning screw 2 includes a handle 21, a scale shaft 22, a cutter shaft 23 and a cutter head 24 in sequence along the length direction, the cutter shaft 23 is adapted to the auxiliary positioning hole 11, the top of the tuning cover plate 1 extends upward and is provided with a first positioning groove 12 adapted to the scale shaft 22, the first positioning groove 12 is an annular groove arranged around the auxiliary positioning hole 11, the length of the scale shaft 22 is greater than the depth of the first positioning groove 12, and the scale shaft 22 is provided with scale markings 25. The adjustment cover 1 is aligned with and overlaps the tuning screw 31 of the filter cover 3 through the auxiliary positioning hole 11, achieving precise pre-alignment of the adjustment screw 2 and the tuning screw 31 and avoiding repeated alignment. The handle 21 of the adjustment screw 2 is easy to grip and apply force, the scale axis 22 is used to quantify the depth, the blade shaft 23 serves as a guide, and the blade head 24 is used to tighten the tuning screw. The first positioning groove 12 is set around the auxiliary positioning hole 11, which forms a radial limit on the scale axis 22 and prevents the scale axis from shifting, thus preventing reading errors. At the same time, the length of the scale axis is greater than the depth of the first positioning groove, ensuring that the scale markings are always visible during the adjustment process.

[0024] Furthermore, a second positioning groove 13 extends downward from the lower end of the adjustment cover plate 1. The second positioning groove 13 is an annular groove surrounding the auxiliary positioning hole 11. The diameter of the second positioning groove 13 is the same as that of the auxiliary positioning hole 11. The diameter of the cutter shaft 23 matches the diameter of the second positioning groove and the diameter of the auxiliary positioning hole. The second positioning groove 13 is coaxial with the auxiliary positioning hole 11 and has the same diameter, forming a "double radial constraint" with the cutter shaft 23: the auxiliary positioning hole 11 restricts the upper part of the cutter shaft from shaking, and the second positioning groove 13 restricts the lower part of the cutter shaft from shaking. Compared with a single positioning hole, this can significantly reduce the radial offset of the cutter shaft during the adjustment process, ensure the coaxiality of the cutter head 24 and the tuning screw 31, and improve the stability of fine adjustment.

[0025] Furthermore, the scale markings 25 include large scale lines arranged in a ring and small scale lines equidistantly distributed along the scale axis in both the circumferential and axial directions.

[0026] Furthermore, the spacing between adjacent minimum scale lines is 0.1 mm, the width of the minimum scale line is 0.1 mm, and the spacing between adjacent maximum scale lines is 0.5 or 1 mm. The scale lines are painted with black or red paint. Under natural light or normal workshop lighting, the human eye can clearly distinguish them (the visual resolution threshold is approximately 0.05 mm, and the 0.1 mm size meets the requirements for human eye recognition). The large scale lines (in this embodiment, a 1 mm spacing) are used for quickly reading integer adjustment values, and the circular scale lines ensure that they can be observed from any angle, adapting to the multi-angle operation requirements during manual adjustment.

[0027] Furthermore, the scale mark 25 on the adjustment axis 22 of the adjusting screwdriver 2 forms a reading reference line with the edge of the top surface of the first positioning groove 12. The edge of the top surface of the first positioning groove 12 is a fixed physical reference point. The scale mark 25 moves axially with the adjusting screwdriver 2. The reading reference line formed by the two can eliminate the reading deviation caused by changes in the hand position, ensure the consistency of different operators when reading the same adjustment amount, and improve the reliability of the adjustment data.

[0028] Furthermore, the total length of the scale markings 25 is greater than the maximum stroke of the tuning screw, and the zero point of the scale markings 25 on the scale axis 22 is exactly flush with the top surface of the first positioning groove 12 when the adjusting screw 2 abuts against the highest-positioned tuning screw. The total length of the scale markings covers the entire stroke of the tuning screw, avoiding scale overflow during adjustment; the zero point is flush with the top surface of the first positioning groove when it abuts against the highest-positioned tuning screw (initially not screwed in), so that the scale value directly corresponds to the screw-in depth of the tuning screw (the zero point is the starting point, and the scale value increases downwards), without the need for additional calculations, achieving an intuitive "what you see is what you get" reading.

[0029] Furthermore, the upper end of the filter cover plate 3 is provided with multiple positioning holes 32, and the lower end of the debugging cover plate 1 is provided with positioning posts 14 corresponding to the positioning holes 32. The precise fit between the positioning posts 14 and the positioning holes 32 can strictly limit the relative displacement between the debugging cover plate 1 and the filter cover plate 3, ensuring that the auxiliary positioning hole 11 and the tuning screw 31 always accurately overlap, providing a stable guiding foundation for the debugging screw 2, and avoiding debugging misalignment caused by cover plate offset.

[0030] Furthermore, the positioning hole 32 and the positioning post 14 are magnetically engaged; an iron sheet is embedded at the bottom of the positioning hole 32, and a permanent magnet is embedded at the end of the positioning post 14. The attraction force between the permanent magnet and the iron sheet can stably attach the adjustment cover 1 to the filter cover 3, preventing the cover from loosening due to vibration or hand contact during the adjustment process; at the same time, the magnetic attraction strength is moderate, which facilitates manual disassembly, replacement or adjustment, taking into account both stability and ease of operation.

[0031] This organization is suitable for cavity filters with tuning accuracy requirements of 0.1mm (medium to low precision), including but not limited to: miniaturized cavity filters for 5G base stations (operating frequency band 3.5GHz-5GHz), multi-cavity cavity filters in microwave communication equipment (bandwidth 50MHz-200MHz), and cavity filters for radar systems.

[0032] During debugging, the debugging cover plate 1 is first fixed directly above the filter cover plate 3 by the magnetic engagement of the positioning pin 14 and the positioning hole 32, ensuring that the auxiliary positioning hole 11 is precisely aligned with the tuning screw 31. The debugging screwdriver 2 passes through the first positioning groove 12, the auxiliary positioning hole 11, and the second positioning groove 13 in sequence, with the cutter head 24 engaging with the target tuning screw 31. When the handle 21 is turned, the cutter shaft 23 moves stably under the dual constraints of the auxiliary positioning hole 11 and the second positioning groove 13, avoiding radial wobbling. The scale shaft 22 moves synchronously with the cutter shaft, and its scale mark 25 is compared with the baseline on the top surface of the first positioning groove 12, allowing direct reading of the screw-in depth of the tuning screw 31 (minimum accuracy 0.1mm). Through this process, precise, intuitive, and stable adjustment of the tuning screw is achieved, meeting the debugging requirements of high-precision cavity filters.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A manual adjustment auxiliary mechanism for a cavity filter, comprising an adjustment cover plate (1) and an adjustment screwdriver (2); the adjustment cover plate (1) has an auxiliary positioning hole (11), the auxiliary positioning hole (11) of the adjustment cover plate (1) is arranged in the same manner as the tuning screw (31) of the filter cover plate (3), the adjustment cover plate (1) and the filter cover plate (3) are arranged parallel to each other; the adjustment cover plate (1) is located directly above the filter cover plate (3), and the auxiliary positioning hole (11) of the adjustment cover plate (1) overlaps with the tuning screw (31) of the filter cover plate; the adjustment screwdriver (2) is inserted from top to bottom through the auxiliary positioning hole (11) and the tuning screw (31) to adjust the depth of the tuning screw at the corresponding position of the filter cover plate, characterized in that, The debugging screwdriver (2) includes, in sequence along its length, a handle (21), a scale shaft (22), a cutter shaft (23), and a cutter head (24). The cutter shaft (23) is adapted to the auxiliary positioning hole (11). The top of the debugging cover plate (1) extends upward and is provided with a first positioning groove (12) adapted to the scale shaft (22). The first positioning groove (12) is an annular groove surrounding the auxiliary positioning hole (11). The length of the scale shaft (22) is greater than the depth of the first positioning groove (12). The scale shaft (22) is provided with scale markings (25).

2. The manual adjustment auxiliary mechanism for a cavity filter according to claim 1, characterized in that, The lower end of the debugging cover plate (1) extends downward and is provided with a second positioning groove (13). The second positioning groove (13) is an annular groove surrounding the auxiliary positioning hole (11). The diameter of the second positioning groove (13) is the same as that of the auxiliary positioning hole (11). The diameter of the cutter shaft (23) matches the diameter of the second positioning groove and the diameter of the auxiliary positioning hole.

3. The manual adjustment auxiliary mechanism for a cavity filter according to claim 1, characterized in that, The scale markings (25) include large scale lines arranged in a ring and small scale lines distributed at equal intervals along the circumferential and axial directions of the scale axis.

4. The manual adjustment auxiliary mechanism for a cavity filter according to claim 1, characterized in that, The spacing between adjacent minimum scale lines is 0.1 mm, the width of the minimum scale line is 0.1 mm, the spacing between adjacent maximum scale lines is 0.5 or 1 mm, and the scale lines are painted with black or red paint.

5. The manual adjustment auxiliary mechanism for a cavity filter according to claim 1, characterized in that, The scale mark (25) on the adjustment screwdriver (2) and the edge of the top surface of the first positioning groove (12) form a reading reference line.

6. The manual adjustment auxiliary mechanism for a cavity filter according to claim 5, characterized in that, The total length of the scale mark (25) is greater than the maximum stroke of the tuning screw, and the zero point of the scale mark (25) on the scale axis (22) is exactly flush with the top surface of the first positioning groove (12) when the adjusting screw (2) comes into contact with the tuning screw at the highest position.

7. The manual adjustment auxiliary mechanism for a cavity filter according to claim 1, characterized in that, The filter cover (3) has multiple positioning holes (32) at its upper end, and the debugging cover (1) has a positioning post (14) at its lower end corresponding to the positioning holes (32).

8. The manual adjustment auxiliary mechanism for a cavity filter according to claim 7, characterized in that, The positioning hole (32) and the positioning post (14) are magnetically engaged; an iron sheet is embedded at the bottom of the positioning hole (32), and a permanent magnet is embedded at the end of the positioning post (14).

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