Coupling adjustment structure and filter

Abstract

The utility model relates to the technical field of communication, and provides a coupling adjustment structure and a filter. The coupling adjusting structure comprises a coupling sheet, a bending sheet, a first mounting sheet and a second mounting sheet, the coupling sheet has a height direction, a thickness direction and a width direction which are vertical in pairs, the projection area of the coupling sheet in the thickness direction is larger than that of the coupling sheet in the width direction, and the bending sheet is connected to the side part of the coupling sheet in the width direction; the first mounting piece and the second mounting piece are connected to the bending piece at intervals in the height direction, and the first mounting piece and the second mounting piece protrude out of the outer side wall of the bending piece. The first mounting piece and the second mounting piece protrude out of the outer side wall of the bending piece and can clamp the two ends of a mounting hole of the cover plate, and the coupling adjusting structure can be rotatably arranged on the cover plate. The coupling adjustment structure is a sheet body structure, the structure is simple, the number of parts is small, the weight is greatly reduced, and concise and lightweight design of the coupling adjustment structure and the filter can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of communication, in particular to a coupling adjustment structure and a filter. Background Art

[0002] As a radio frequency device, the filter can allow signals in a certain frequency band to pass through with minimum loss and suppress signals in other frequency bands, thereby selecting the signals in the required frequency band.

[0003] Some existing filters include a cavity, a resonator, a cover plate and a coupling adjustment structure. Two or more resonators are installed in the cavity. The cavity has an opening. The cover plate covers one end of the cavity with the opening. The cover plate has a mounting hole. The coupling adjustment structure is installed in the mounting hole of the cover plate and is located between the two resonators. It is used to adjust the coupling strength between the two resonators or to adjust the position of the transmission zero point in the passband. However, the existing coupling adjustment structure has a complex structure, many components, and a large weight, which is not conducive to the simplification and lightweight design of the filter. Utility Model Content

[0004] The utility model aims to provide a coupling adjustment structure and a filter, aiming to solve the technical problem that the existing coupling adjustment structure is heavy.

[0005] In the first aspect, the present application provides a coupling adjustment structure, which includes a coupling plate, a bending plate, a first mounting plate and a second mounting plate, the coupling plate having a height direction, a thickness direction and a width direction that are perpendicular to each other, the projection area of ​​the coupling plate in the thickness direction is larger than the projection area of ​​the coupling plate in the width direction, the bending plate is connected to the side of the coupling plate in the width direction, the first mounting plate and the second mounting plate are connected to the bending plate at intervals along the height direction, and the first mounting plate and the second mounting plate protrude from the outer side wall of the bending plate.

[0006] In the second aspect, the present application provides a filter, which includes a cavity, a cover plate, a resonator and a coupling adjustment structure as described in any one of the above items, the number of the resonator is more than two, and the more than two resonator components are installed in the cavity, the cavity has an opening, the cover plate covers one end of the cavity having the opening, the cover plate has a mounting hole, the first mounting plate and the second mounting plate are respectively clamped at both ends of the mounting hole, and the coupling plate is located between the two resonator components.

[0007] The coupling adjustment structure and the filter provided by the utility model have the following beneficial effects: the first mounting plate and the second mounting plate protrude from the outer side wall of the bending plate, and can clamp the two ends of the mounting hole of the cover plate, that is, the first mounting plate and the second mounting plate respectively abut against the two ends of the mounting hole, instead of being fixedly installed at the two ends of the mounting hole by welding, fastener connection, clamping or bonding, etc., and the ends of the mounting hole are not provided with convex points that block rotation, so the first mounting plate and the second mounting plate can rotate along the circumference of the mounting hole under the drive of external force, so that the coupling adjustment structure can be rotatably arranged on the cover plate; because the projection area of ​​the coupling plate in the thickness direction is larger than the projection area of ​​the coupling plate in the width direction, the area of ​​the coupling plate facing the two adjacent resonators changes during the rotation process, so as to adjust the coupling strength between the two resonators or adjust the position of the transmission zero point in the passband; the coupling adjustment structure is a sheet structure, which has a simple structure, fewer components, and greatly reduced weight, thereby solving the technical problem of the existing coupling adjustment structure having a large weight, and facilitating the realization of a simplified and lightweight design of the coupling adjustment structure and the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0009] Figure 1 A schematic diagram of the first structure of the coupling adjustment structure provided in this application;

[0010] Figure 2 for Figure 1 Schematic diagram of the assembly of the coupling adjustment structure;

[0011] Figure 3 A second structural schematic diagram of the coupling adjustment structure provided in this application;

[0012] Figure 4 for Figure 3 Schematic diagram of the assembly of the coupling adjustment structure;

[0013] Figure 5 A third structural schematic diagram of the coupling adjustment structure provided in this application;

[0014] Figure 6 for Figure 5 Schematic diagram of the assembly of the coupling adjustment structure;

[0015] Figure 7 A fourth structural schematic diagram of the coupling adjustment structure provided in this application;

[0016] Figure 8 for Figure 7 Schematic diagram of the assembly of the coupling adjustment structure;

[0017] Fig. 9 for Figure 7 Schematic diagram of the projection of the coupling adjustment structure in the height direction;

[0018] Fig.10 A schematic diagram of the structure of the filter provided in this embodiment;

[0019] Fig.11 An exploded view of the filter provided for this embodiment.

[0020] Among them, the reference numerals in the figure are:

[0021] X, thickness direction; Y, width direction; Z, height direction;

[0022] 10. cavity; 11. opening;

[0023] 20. Cover plate; 21. Mounting hole; 211. First chamfer; 212. Second chamfer;

[0024] 30. Resonant element;

[0025] 40. Coupling adjustment structure; 41. Coupling plate; 411. Pressing portion; 42. Bending plate; 421. First bending section; 422. Second bending section; 423. First connecting section; 424. Second connecting section; 425. Bending window; 426. Second window; 43. First mounting plate; 44. Second mounting plate; 45. Clamping interval. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] Combination Figure 1 , Figure 3 , Figure 5 and Figure 7 The coupling adjustment structure 40 provided in the present application includes a coupling piece 41, a bending piece 42, a first mounting piece 43 and a second mounting piece 44. The coupling piece 41 has a height direction Z, a thickness direction X and a width direction Y which are perpendicular to each other. The projection area of ​​the coupling piece 41 in the thickness direction X is larger than the projection area of ​​the coupling piece 41 in the width direction Y. The bending piece 42 is connected to the side of the coupling piece 41 in the width direction Y. The first mounting piece 43 and the second mounting piece 44 are connected to the bending piece 42 at intervals along the height direction Z. The first mounting piece 43 and the second mounting piece 44 protrude from the outer side wall of the bending piece 42.

[0033] Among them, combined Figure 2 , Figure 4 , Figure 6 and Figure 8 The cover plate 20 of the filter has a through mounting hole 21. The mounting hole 21 has openings at both ends in the hole depth direction (see the height direction Z), and the ends of the mounting hole 21 refer to the edge of the opening and the surrounding surface.

[0034] In this embodiment, the first mounting piece 43 abuts against the end of the mounting hole 21 in the positive direction of the height direction Z, and in the absence of a downward external force, limits the negative movement of the coupling adjustment structure 40 in the height direction Z; the second mounting piece 44 abuts against the end of the mounting hole 21 in the negative direction of the height direction Z, and in the absence of an upward external force, limits the positive movement of the coupling adjustment structure 40 in the height direction Z, preventing the coupling adjustment structure 40 from being separated from the mounting hole 21 in the positive and negative directions of the height direction Z, thereby achieving a stable position of the coupling adjustment structure 40 in the height direction Z. At the same time, the first mounting piece 43 and the second mounting piece 44 abut against both ends of the mounting hole 21, obtaining the support force of the cover plate 20 on the coupling adjustment structure 40, and enhancing the stability of the installation. The first mounting piece 43 and the second mounting piece 44 form a clamping gap 45, and the coupling adjustment structure 40 clamps the two ends of the mounting hole 21 through the clamping gap 45, that is, the first mounting piece 43 and the second mounting piece 44 are respectively against the two ends of the mounting hole 21, instead of being fixedly installed at the two ends of the mounting hole 21 by welding, fastener connection, clamping or bonding, etc., and the end of the mounting hole 21 is not provided with a convex point to block rotation, so the first mounting piece 43 and the second mounting piece 44 can rotate along the circumference of the mounting hole 21 under the drive of external force, so that the coupling adjustment structure 40 can be rotatably arranged on the cover plate 20. Since the projection area of ​​the coupling piece 41 in the thickness direction X is larger than the projection area of ​​the coupling piece 41 in the width direction Y, the area of ​​the coupling piece 41 facing the two adjacent resonators 30 changes during the rotation process, so as to adjust the coupling strength between the two resonators 30 or adjust the position of the transmission zero point in the passband. The coupling adjustment structure 40 is a sheet structure with a simple structure, fewer components, and greatly reduced weight, which is conducive to the simplification and lightweight design of the coupling adjustment structure 40 and the filter.

[0035] In some embodiments, in combination Figures 1 to 6The first mounting piece 43 and the second mounting piece 44 are located between the end of the bending piece 42 close to the coupling piece 41 and the end of the bending piece 42 away from the coupling piece 41. The outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is an arc surface, which is conducive to the arc surface fitting with the hole wall of the mounting hole 21. On the one hand, the bending piece 42 is limited in the radial direction of the mounting hole 21 to prevent the coupling adjustment structure 40 from moving radially along the mounting hole 21, which can ensure the installation stability and position stability and avoid changes in product indicators due to movement. On the one hand, the contact area and supporting force between the bending piece 42 and the mounting hole 21 are enhanced, which is conducive to the stable and rotatable installation of the coupling adjustment structure 40 in the mounting hole 21. On the other hand, the arc surface can reduce the resistance encountered by the coupling adjustment structure 40 during the rotation process, which is conducive to the rotation adjustment of the coupling adjustment structure 40. In other embodiments, the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is a plane. In this case, when the coupling adjustment structure 40 is installed in the mounting hole 21, the plane may not contact the hole wall of the mounting hole 21 and will not affect the rotation of the coupling adjustment structure 40. Alternatively, the edge of the plane contacts the hole wall of the mounting hole 21 to increase the rotation support force, which can also prevent the coupling adjustment structure 40 from moving in the radial direction and ensure the stable rotation of the coupling adjustment structure 40.

[0036] In some other embodiments, combined with Figure 7 and Figure 8 The first mounting piece 43 and the second mounting piece 44 are located on the end surface of the bending piece 42 away from the coupling piece 41. In the height direction Z, there is no other structure between the first mounting piece 43 and the second mounting piece 44. The interval between the first mounting piece 43 and the second mounting piece 44 forms a clamping interval 45. The side wall of the clamping interval 45 is in line contact with the hole wall of the mounting hole 21, which improves the rotation support force and can also prevent the coupling adjustment structure 40 from moving in the radial direction and ensure the stable rotation of the coupling adjustment structure 40.

[0037] It should be noted that, combined with Figure 1 , Figure 3 , Figure 5 and Figure 7 , the number of the bending pieces 42 can be one or two. When the number of the bending pieces 42 is two, the two bending pieces 42 are respectively located on opposite sides of the coupling piece 41 in the width direction Y, wherein each bending piece 42 can be connected to the first mounting piece 43 and the second mounting piece 44, or one bending piece 42 is connected to the first mounting piece 43, and the other bending piece 42 is connected to the second mounting piece 44, or one bending piece 42 is connected to the first mounting piece 43 and the second mounting piece 44, and the other bending piece 42 may be connected to or not connected to the first mounting piece 43 or the second mounting piece 44, which is not limited here.

[0038] For example, combined with Figures 1 to 9 The two bending pieces 42 are connected to a first mounting piece 43 and a second mounting piece 44 spaced apart along the height direction Z, so that the two bending pieces 42 are stably positioned in the height direction Z and are stably clamped at both ends of the mounting hole 21, further ensuring that the coupling adjustment structure 40 is stably assembled in the mounting hole 21 and preventing the coupling adjustment structure 40 from loosening and falling off.

[0039] For example, there are two bending pieces 42, the first mounting piece 43 is connected to one of the bending pieces 42, the number of the first mounting pieces 43 can be one, two or more than two, the second mounting piece 44 is located at the other bending piece 42, the number of the second mounting pieces 44 can be one, two or more than two, so that the two bending pieces 42 are respectively pressed against the end of the mounting hole 21 through the first mounting piece 43 and the second mounting piece 44, which is conducive to the coupling piece 41 to remain stable during rotation. Furthermore, the first mounting piece 43 and the second mounting piece 44 are respectively connected to different bending pieces 42, thereby increasing the operating space for the split connection or integral molding of the first mounting piece 43 and the second mounting piece 44. At the same time, since one bending piece 42 is only provided with the first mounting piece 43 or the second mounting piece 44, that is, one bending piece 42 is only limited to the positive or negative position in the height direction Z, when the coupling adjustment structure 40 is assembled and disassembled, only one bending piece 42 needs to be elastically bent to release the unidirectional restriction in the height direction Z, so that it can pass through the mounting hole 21, without the need to elastically bend the two bending pieces 42, thereby simplifying the assembly and disassembly operations.

[0040] For example, there are two bent pieces 42, one of which is connected to the first mounting piece 43 and the second mounting piece 44, and the other bent piece 42 is against the hole wall of the mounting hole 21 and is not connected to the first mounting piece 43 and the second mounting piece 44. During assembly, the operator only needs to assemble the first mounting piece 43 and the second mounting piece 44 on one bent piece 42 to the two ends of the mounting hole 21, and the outer wall of the other bent piece 42 naturally abuts against the hole wall of the mounting hole 21, and there is no need to perform a clamping operation with the mounting hole 21, thereby simplifying the assembly operation.

[0041] For example, there are two bending pieces 42, one of which is connected to the first mounting piece 43 and the second mounting piece 44 spaced apart along the height direction Z, so that the bending piece 42 is stably positioned in the height direction Z and is stably clamped at both ends of the mounting hole 21, ensuring that the coupling adjustment structure 40 is stably assembled in the mounting hole 21; the other bending piece 42 is connected to the first mounting piece 43 or the second mounting piece 44, which can increase the supporting force between the bending piece 42 and the end of the mounting hole 21, and only performs unidirectional limiting in the positive or negative direction in the height direction Z, which is convenient for the assembly and disassembly of the bending piece 42.

[0042] For another example, there is one bending piece 42, which is connected to a first mounting piece 43 and a second mounting piece 44. The bending piece 42 abuts against the end of the mounting hole 21 through the first mounting piece 43 and the second mounting piece 44, respectively, to achieve position stability of the coupling adjustment structure 40 in the height direction Z.

[0043] Furthermore, the number of first mounting plates 43 may be two or more than two, and more than two first mounting plates 43 abut against the upper end portions of the mounting hole 21 in different radial directions, thereby improving the circumferential stability of the coupling adjustment structure 40; and / or, the number of second mounting plates 44 may be two or more than two, and more than two second mounting plates 44 abut against the lower end portions of the mounting hole 21 in different radial directions, thereby improving the circumferential stability of the coupling adjustment structure 40; or, the bending plate 42 abuts against the hole wall of the mounting hole 21 to prevent the coupling adjustment structure 40 from moving radially along the mounting hole 21, thereby improving the circumferential stability of the coupling adjustment structure 40.

[0044] In some embodiments, in combination Figure 1 , Figure 3 , Figure 5 and Figure 7 There are two bending pieces 42, and the two bending pieces 42 are located on opposite sides of the coupling piece 41 in the width direction Y, so that the overall structural shape of the coupling adjustment structure 40 is symmetrical or roughly symmetrical, which is conducive to the center of gravity falling on the axial line in the height direction Z. The center of gravity is stable and does not shift, ensuring that the coupling adjustment structure 40 has a good clamping effect and installation stability and position stability.

[0045] Specifically, the two bending pieces 42 directly abut against the hole wall of the mounting hole 21 along the radial direction of the mounting hole 21, or abut against the two ends of the mounting hole 21 along the depth direction of the mounting hole 21 through the first mounting piece 43 and the second mounting piece 44, which is beneficial to uniform force on the coupling adjustment structure 40 and improves the installation stability.

[0046] Specifically, the bending piece 42 is located at the top of the coupling piece 41, the bending piece 42 and the coupling piece 41 are roughly flush, and the first mounting piece 43 connected to the bending piece 42 is located at the upper end of the mounting hole 21, that is, the first mounting piece 43 and the outer surface of the cover plate 20 are roughly flush, so as to avoid the coupling piece 41 being higher than or too higher than the bending piece 42, thereby reducing or avoiding the coupling piece 41 being higher than the cover plate 20, which can ensure that the filter and other products are simple and beautiful on one side of the cover plate 20, and can basically avoid collision with other structures when the filter and other products are assembled with other structures to affect the product indicators, and can reduce the overall height of the filter and other products.

[0047] In some embodiments, the number of the first mounting pieces 43 may be one, two, or more than two, which is not limited herein. When the number of the first mounting pieces 43 is more than two, the more than two first mounting pieces 43 are spaced apart along the circumference of the coupling adjustment structure 40, and can abut against the upper end of the mounting hole 21 in different radial directions, thereby increasing the abutment position of the coupling adjustment structure 40 with the end of the mounting hole 21 in the circumferential direction of the mounting hole 21, and improving the circumferential stability of the coupling adjustment structure 40.

[0048] In some embodiments, the number of the second mounting pieces 44 may be one, two, or more than two, which is not limited here. When the number of the second mounting pieces 44 is more than two, the more than two second mounting pieces 44 are spaced apart along the circumference of the coupling adjustment structure 40, and can abut against the lower end of the mounting hole 21 in different radial directions, thereby increasing the abutment position of the coupling adjustment structure 40 with the end of the mounting hole 21 in the circumferential direction of the mounting hole 21, and improving the stability of the coupling adjustment structure 40 in the circumferential direction.

[0049] It should be noted that, in the coupling adjustment structure 40 , the number of the first mounting pieces 43 and the number of the second mounting pieces 44 may be the same or different, which is not limited here.

[0050] In some embodiments, in combination Figure 1 , Figure 3 , Figure 5 and Figure 8 The projections of the first mounting piece 43 and the second mounting piece 44 in the height direction Z overlap to avoid the generation of a force arm between the two. The two pieces are directly opposite to the two ends of the clamping mounting hole 21 up and down to reduce looseness or displacement caused by vibration or force.

[0051] In other embodiments, the projections of the first mounting plate 43 and the second mounting plate 44 in the height direction Z do not overlap each other, that is, the first mounting plate 43 and the second mounting plate 44 are located in different radial directions of the mounting hole 21, thereby increasing the abutment position of the coupling adjustment structure 40 in the circumferential direction of the mounting hole 21 with the end of the mounting hole 21, thereby improving the circumferential stability of the coupling adjustment structure 40.

[0052] In some embodiments, in combination Figure 1 , Figure 3 and Figure 5 In the projection along the height direction Z, the first mounting piece 43 and the second mounting piece 44 protrude outward along the radial direction of the coupling adjustment structure 40. The first mounting piece 43 and the second mounting piece 44 protruding along the radial direction will not limit the rotation direction of the coupling adjustment structure 40. The coupling adjustment structure 40 can rotate both clockwise and counterclockwise, which facilitates the flexible rotation angle of the coupling adjustment structure 40, thereby flexibly adjusting the coupling strength between the two resonators 30.

[0053] In other embodiments, in combination Figure 7 and Fig. 9 In the projection along the height direction Z, the first mounting piece 43 and the second mounting piece 44 both protrude outward in a radial direction inclined to the coupling adjustment structure 40, and the first mounting piece 43 and the second mounting piece 44 are located on the same side of the radial direction of the coupling adjustment structure 40. Figure 7 , the first mounting piece 43 and the second mounting piece 44 protrude outward along the direction P, and the direction O is obliquely intersected with the radial direction O of the coupling adjustment structure 40, and there is an angle D. In this way, the first mounting piece 43 and the second mounting piece 44 are obliquely clamped at both ends of the mounting hole 21. If the coupling adjustment structure 40 rotates along the oblique direction of the first mounting piece 43 and the second mounting piece 44, the abutment length of the first mounting piece 43 and the second mounting piece 44 with the end of the mounting hole 21 will gradually increase until the bending piece 42 collides with the hole wall of the mounting hole 21, preventing the coupling adjustment structure 40 from continuing to rotate; while the reverse rotation will not cause the bending piece 42 to collide with the hole wall of the mounting hole 21, thus limiting the unidirectional rotation of the bending piece 42, effectively preventing the coupling adjustment structure 40 from rotating in the reverse direction, avoiding misoperation by the staff, and also avoiding the coupling adjustment structure 40 from rotating along the oblique direction of the first mounting piece 43 and the second mounting piece 44 due to vibration during use. Figure 7 and Fig. 9 As shown, the coupling adjustment structure 40 can only rotate counterclockwise and cannot rotate clockwise.

[0054] Optionally, the angle D ranges from 30° to 90°.

[0055] In some embodiments, in combination Figure 1 , Figure 3 , Figure 5 and Figure 7 The bending piece 42 is elastically bent around the height direction Z. With the help of the rebound property of the bending piece 42 after bending, the first mounting piece 43, the second mounting piece 44 and the outer wall of the bending piece 42 are pressed against the hole wall of the mounting hole 21 along the radial direction of the mounting hole 21, so that the coupling adjustment structure 40 is locked in the radial direction of the mounting hole 21, thereby improving the radial position stability of the coupling adjustment structure 40.

[0056] At the same time, the outer wall of the bent piece 42 is an arc surface, which is conducive to fitting with the hole wall of the mounting hole 21, realizing the radial limitation of the bending piece 42 in the mounting hole 21, enhancing the contact area and supporting force between the bending piece 42 and the mounting hole 21, and can reduce the resistance encountered by the coupling adjustment structure 40 during rotation.

[0057] In addition, compared with the bending piece 42 that is not elastically bent, for example, the bending piece 42 is plastically bent into a plurality of connected flat pieces, the elastically bent bending piece 42 provided in this embodiment can enhance the deformation capacity of the coupling adjustment structure 40, that is, under the action of external force, the bending piece 42 can bend inward more effortlessly, so that the first mounting piece 43 and the second mounting piece 44 are separated from the end of the mounting hole 21, thereby improving the assembly and disassembly efficiency.

[0058] In one embodiment, in combination Figure 7 At least one of the first mounting plate 43 and the second mounting plate 44 is located at the end face of the bending plate 42 (i.e., the end face away from the coupling plate 41). Since the bending plate 42 is equivalent to a cantilever beam structure, the end deflection of the bending plate 42 is large and its resilience is large, so that the side wall of the clamping interval 45 is pressed tighter against the hole wall of the mounting hole 21 along the radial direction of the mounting hole 21, thereby improving the radial position stability of the coupling adjustment structure 40.

[0059] In one embodiment, in combination Figure 1 , Figure 3 , Figure 5 and Figure 7 The bending piece 42 is wound into an arc or spiral shape around the height direction Z. The winding arrangement can make the bending piece 42 occupy less space, which is beneficial to the miniaturized design of the coupling adjustment structure 40. A longer bending piece 42 can be accommodated in the mounting hole 21 with the same aperture, so that the bending piece 42 can be designed to be longer. The longer bending piece 42 has a greater resilience, thereby pressing the bending piece 42 more tightly against the hole wall of the mounting hole 21 along the radial direction of the mounting hole 21, thereby improving the radial position stability of the coupling adjustment structure 40.

[0060] Optionally, when there are two bending pieces 42, both bending pieces 42 are bent so that both bending pieces 42 have resilience, and both bending pieces 42 are pressed against the hole wall of the mounting hole 21, further improving the radial position stability of the coupling adjustment structure 40.

[0061] Optionally, when there are two bending pieces 42, one bending piece 42 is bent and the other bending piece 42 is not bent. The bent piece 42 is pressed against the hole wall of the mounting hole 21 to ensure the radial position stability of the coupling adjustment structure 40. The unbent bending piece 42 can also be pressed against the hole wall of the mounting hole 21 under the action of the rebound force applied by the other bending piece 42. At the same time, the unbent bending piece 42 is difficult to bend inward due to its poor deformation ability, so that the first mounting piece 43 and the second mounting piece 44 on the unbent bending piece 42 are firmly against the end of the mounting hole 21 and are not easy to loosen, thereby improving the installation reliability of the coupling adjustment structure 40.

[0062] In some embodiments, in combination Figure 3 and Figure 4 The coupling adjustment structure 40 has a bending window 425 that passes through the bending piece 42. The bending window 425 is located between the coupling piece 41 and the first mounting piece 43, or between the coupling piece 41 and the second mounting piece 44, or between the coupling piece 41 and the first mounting piece 43 and the second mounting piece 44, that is, the bending window 425 is closer to the coupling piece 41 than the first mounting piece 43 and the second mounting piece 44. The setting of the bending window 425 is conducive to reducing the rigidity of the bending piece 42, facilitating the elastic bending or plastic bending of the bending piece 42, and reducing the process difficulty.

[0063] When the bending piece 42 is elastically bent about the height direction Z, the bending window 425 increases the resilience of the bending piece 42 and increases the locking force of the coupling adjustment structure 40 in the radial direction of the mounting hole 21 .

[0064] In some embodiments, in combination Figure 2 and Figure 7 , when viewed in the forward direction of the height direction Z, the side surface of the first mounting piece 43 close to the second mounting piece 44 is tilted downward or horizontally arranged. Wherein, when the side surface of the first mounting piece 43 close to the second mounting piece 44 has a plane, the angle A between the plane and the height direction Z is less than or equal to 90°. Alternatively, when the side surface of the first mounting piece 43 close to the second mounting piece 44 is an arc surface, the angle A between the cut surface of the arc surface and the height direction Z is less than or equal to 90°. In this way, when the coupling adjustment structure 40 is assembled into the mounting hole 21 of the cover plate 20 from top to bottom along the height direction Z, the side surface of the first mounting piece 43 close to the second mounting piece 44 abuts against the end face of the hole 21. Since the angle A is an acute angle or a right angle, the coupling adjustment structure 40 is prevented from continuing to move downward under the action of external force, and the installation position of the coupling adjustment structure 40 is defined. At the same time, the coupling adjustment structure 40 can be prevented from being separated from the mounting hole 21 from top to bottom during use, thereby improving the position stability of the coupling adjustment structure 40.

[0065] It can be understood that in other embodiments, Figure 4 and Figure 6, when viewed in the positive direction of the height direction Z, the side surface of the first mounting piece 43 close to the second mounting piece 44 is inclined upward. When the side surface of the first mounting piece 43 close to the second mounting piece 44 has a plane, the angle A between the plane and the height direction Z is greater than 90°. Alternatively, when the side surface of the first mounting piece 43 close to the second mounting piece 44 is an arc surface, the angle A between the cut surface of the arc surface and the height direction Z is greater than 90°. When disassembling, the coupling adjustment structure 40 is pulled from top to bottom to move the coupling adjustment structure 40 downward and out of the mounting hole 21, without the need to press the bending piece 42 together to separate the first mounting piece 43 and the second mounting piece 44 from the end of the mounting hole 21 along the radial direction of the mounting hole 21, so as to avoid the coupling adjustment structure 40 being plastically deformed and unusable or broken due to the pressing of the bending piece 42. At the same time, a side surface of the first mounting piece 43 close to the second mounting piece 44 is inclined upward, and the inclined surface can adapt to the upper hole diameter of the mounting hole 21 within a certain range, which is beneficial to reducing the processing accuracy requirements of the mounting hole 21, and the upper hole of the mounting hole 21 does not need to be chamfered, thereby reducing the processing steps and processing costs of the mounting hole 21.

[0066] In some embodiments, in combination Figure 2 , when viewed in the positive direction of the height direction Z, the side surface of the second mounting piece 44 away from the first mounting piece 43 is arranged to be inclined upward. That is, the angle B between the side surface of the second mounting piece 44 away from the first mounting piece 43 and the height direction Z is greater than 90°. In this way, when the coupling adjustment structure 40 is assembled into the mounting hole 21 of the cover plate 20 from top to bottom along the height direction Z, the side surface of the second mounting piece 44 away from the first mounting piece 43 first contacts the upper hole end surface of the mounting hole 21. Since the surface is arranged to be inclined upward, a guiding surface is formed, which is conducive to reducing the resistance of the second mounting piece 44 to move downward relative to the mounting hole 21, facilitating the second mounting piece 44 to move downward to the lower hole end surface of the mounting hole 21, and simplifying the assembly operation of the coupling adjustment structure 40.

[0067] Optionally, a surface of the second mounting piece 44 that is away from the first mounting piece 43 may be an inclined plane or a curved surface.

[0068] It can be understood that in other embodiments, Figure 4 and Figure 6, when viewed in the positive direction of the height direction Z, the side surface of the second mounting piece 44 away from the first mounting piece 43 extends obliquely downward or horizontally. That is, the angle B between the side surface of the second mounting piece 44 away from the first mounting piece 43 and the height direction Z is less than or equal to 90°, preventing the coupling adjustment structure 40 from being assembled into the mounting hole 21 of the cover plate 20 from top to bottom along the height direction Z. At this time, in order to facilitate the assembly of the coupling adjustment structure 40 into the mounting hole 21, a chamfer can be set at the upper end of the mounting hole 21 to guide the second mounting piece 44 to elastically shrink into the mounting hole 21; or, the bending piece 42 of the coupling adjustment structure 40 can be clamped by a clamp to close and shrink, and when the second mounting piece 44 reaches the lower end of the mounting hole 21 and the first mounting piece 43 reaches the upper end of the mounting hole 21, the clamp is removed to restore the shape of the coupling adjustment structure 40, and the first mounting piece 43 and the second mounting piece 44 clamp the two ends of the mounting hole 21 respectively to complete the assembly.

[0069] In some embodiments, in combination Figure 4 , when viewed in the positive direction of the height direction Z, the side surface of the second mounting piece 44 close to the first mounting piece 43 gradually tilts downward, that is, the angle C in the figure is greater than 90°, which is conducive to pulling the coupling adjustment structure 40 from the mounting hole 21 from bottom to top under the action of external force, simplifying the disassembly operation, and there is no need to separate the first mounting piece 43 and the second mounting piece 44 from the end of the mounting hole 21 along the thickness direction X by pressing and closing the bending piece 42, so as to avoid the coupling adjustment structure 40 being plastically deformed and unusable or broken due to the pressing of the two coupling pieces 41. At the same time, the side surface of the second mounting piece 44 close to the first mounting piece 43 gradually tilts downward, and the inclined surface can adapt to the lower hole diameter of the mounting hole 21 within a certain range, which is conducive to reducing the processing accuracy requirements of the mounting hole 21, and the lower hole of the mounting hole 21 does not need to be chamfered, reducing the processing procedures and processing costs of the mounting hole 21.

[0070] Optionally, a surface of one side of the second mounting piece 44 close to the first mounting piece 43 may be an inclined plane or a curved surface.

[0071] In some embodiments, the first mounting piece 43 can be connected to the top of the bending piece 42, the outer side wall of the bending piece 42, or the end face of the bending piece 42 away from the coupling piece 41, so that the first mounting piece 43 is arranged close to the outer periphery of the bending piece 42. On the one hand, the split connection or integrated molding of the first mounting piece 43 has a larger operating space, and it is convenient for the first mounting piece 43 to extend to the outer periphery of the bending piece 42 at a shorter distance to abut against the upper end of the mounting hole 21, which is conducive to reducing the size of the first mounting piece 43. On the other hand, the first mounting piece 43 is arranged in the height direction Z There is no structural obstruction, that is, the first mounting piece 43 can be elastically deformed when squeezed in the height direction Z, so that it is convenient to be squeezed by the upper end of the mounting hole 21 during assembly and bend and deform in the direction away from the second mounting piece 44. Even if there are processing tolerances in the first mounting piece 43 and / or the mounting hole 21, the first mounting piece 43 and the upper end of the mounting hole 21 can adaptively elastically deform and cooperate to absorb the processing tolerance and achieve a tight fit, thereby ensuring and improving the axial position stability and state stability of the coupling adjustment structure 40 after being installed in the mounting hole 21.

[0072] In one embodiment, reference may be made to Figure 1 The coupling adjustment structure 40 has a first window that passes through the bending piece 42, one end of the first mounting piece 43 is connected to the side wall of the first window, and the other end of the first mounting piece 43 extends outward along the radial direction of the coupling adjustment structure 40. On the one hand, the first mounting piece 43 has rebound elasticity, can elastically clamp the upper end of the mounting hole 21, and adaptively elastically deform with the mounting holes 21 of different apertures; on the one hand, the first mounting piece 43 is located on the side wall of the bending piece 42, which will not increase the size of the coupling adjustment structure 40 in the height direction Z, which is conducive to the miniaturization design of the coupling adjustment structure 40, and on the other hand, the setting of the first window is conducive to the coupling adjustment structure 40 to achieve lightweight and simplification. In addition, the setting of the first window can realize the first mounting piece 43 integrally stamped and formed on the side wall of the bending piece 42, that is, the first mounting piece 43 and the bending piece 42 of the coupling adjustment structure 40 can be integrally formed based on a sheet substrate, the overall consistency of the coupling adjustment structure 40 is better, which is conducive to simplifying the processing and manufacturing of the coupling adjustment structure 40, and is conducive to the coupling adjustment structure 40 to achieve lightweight and simplification.

[0073] The first mounting piece 43 can be located on any side wall of the first window, which is not limited here. Optionally, the first mounting piece 43 is located on the upper side wall of the first window, so that when the first mounting piece 43 abuts against the upper end of the mounting hole 21, it is subjected to an upward moment, and the upper side wall of the first window can provide support for the first mounting piece 43 to prevent the first mounting piece 43 from plastic deformation, so that the first mounting piece 43 can be pressed downward along the height direction Z to the upper end of the mounting hole 21.

[0074] Optionally, the unfolded area of ​​the first mounting piece 43 is smaller than the area of ​​the first window, so that the first mounting piece 43 can be integrally bent and formed on the first window.

[0075] It can be understood that in other embodiments, the bending piece 42 is not provided with the first window. In this case, the first mounting piece 43 can be separately connected or integrally formed on the top of the bending piece 42 or on the end surface of the bending piece 42 away from the coupling piece 41. The first mounting piece 43 can also be separately connected to the outer wall of the bending piece 42, which is not limited here.

[0076] In one embodiment, in combination Figure 7 One end of the first mounting piece 43 is connected to an end surface of the bending piece 42 away from the coupling piece 41, and the other end of the first mounting piece 43 extends in a direction away from the bending piece 42, so that the first mounting piece 43 is suspended, and the bottom of the first mounting piece 43 is not blocked by the bending piece 42. The bottom of the first mounting piece 43 can more freely and easily abut against the upper end of the mounting hole 21, thereby facilitating the installation of the coupling adjustment structure 40.

[0077] It can be understood that the first mounting piece 43 can also be connected to the inner wall of the bending piece 42 (i.e., the side away from the hole wall of the mounting hole 21), and the first mounting piece 43 protrudes out of the outer periphery of the bending piece 42 by extending around the top or end of the bending piece 42, thereby being able to abut against the upper end of the mounting hole 21.

[0078] In some embodiments, the second mounting piece 44 can be connected to the bottom of the bending piece 42, the outer side wall of the bending piece 42 or the end face of the bending piece 42 away from the coupling piece 41, so that the second mounting piece 44 is arranged close to the outer periphery of the bending piece 42. On the one hand, the second mounting piece 44 has a larger operating space for the split connection or integral molding, which is convenient for the second mounting piece 44 to extend to the outer periphery of the bending piece 42 at a shorter distance to abut against the lower end of the mounting hole 21; on the other hand, the second mounting piece 44 has no structural obstruction in the height direction Z, that is, the second mounting piece 44 can be elastically deformed under force in the height direction Z, so that it is convenient to be squeezed by the lower end of the mounting hole 21 during assembly and bend and deform in a direction away from the first mounting piece 43. Even if there is a processing tolerance in the second mounting piece 44 and / or the mounting hole 21, the second mounting piece 44 and the lower end of the mounting hole 21 are adaptively elastically deformed to absorb the processing tolerance and achieve a tight fit, thereby ensuring and improving the axial position stability and state stability of the coupling adjustment structure 40 after being installed in the mounting hole 21.

[0079] In one embodiment, in combination Figure 1The coupling adjustment structure 40 has a second window 426 that passes through the bending piece 42. One end of the second mounting piece 44 is connected to the side wall of the second window 426, and the other end of the second mounting piece 44 extends outward along the radial direction of the coupling adjustment structure 40. On the one hand, the second mounting piece 44 has rebound elasticity, and can elastically clamp the lower end of the mounting hole 21, and adaptively elastically deform with the mounting holes 21 of different apertures; on the one hand, the second mounting piece 44 is located on the side wall of the bending piece 42, which will not increase the size of the coupling adjustment structure 40 in the height direction Z, which is conducive to the miniaturization design of the coupling adjustment structure 40. On the other hand, the setting of the second window 426 is conducive to the coupling adjustment structure 40 to achieve lightweight and simplification. In addition, the setting of the second window 426 can realize the second mounting piece 44 integrally stamped and formed on the side wall of the bending piece 42, and the overall consistency of the coupling adjustment structure 40 is better, which is conducive to simplifying the processing and manufacturing of the coupling adjustment structure 40, and is conducive to the coupling adjustment structure 40 to achieve lightweight and simplification. In particular, the coupling piece 41 , the first mounting piece 43 , the second mounting piece 44 and the bending piece 42 of the coupling adjustment structure 40 may be integrally formed based on a sheet-like substrate.

[0080] The second mounting piece 44 may be located on any side wall of the second window 426, which is not limited here. Figure 1 and Figure 2 The second mounting piece 44 is located on the lower side wall of the second window 426, so that when the second mounting piece 44 abuts against the lower end of the mounting hole 21, it is subjected to a downward torque. The lower side wall of the second window 426 can provide support for the second mounting piece 44 to prevent the second mounting piece 44 from plastic deformation, so that the second mounting piece 44 can be pressed upward along the height direction Z to the lower end of the mounting hole 21.

[0081] Optionally, the unfolded area of ​​the second mounting piece 44 is smaller than the area of ​​the first window, so that the second mounting piece 44 can be integrally bent and formed on the first window.

[0082] It can be understood that in other embodiments, the bending piece 42 is not provided with the second window 426. In this case, the second mounting piece 44 can be separately connected or integrally formed at the bottom of the bending piece 42 or at an end surface of the bending piece 42 away from the coupling piece 41. The second mounting piece 44 can also be separately connected to the outer wall of the bending piece 42, which is not limited here.

[0083] In one embodiment, in combination Figure 7 One end of the second mounting piece 44 is connected to an end surface of the bending piece 42 away from the coupling piece 41, and the other end of the second mounting piece 44 extends in a direction away from the bending piece 42, so that the second mounting piece 44 is suspended, and the top of the second mounting piece 44 is not blocked by the bending piece 42. The top of the second mounting piece 44 can more freely and easily abut against the lower end of the mounting hole 21, thereby facilitating the installation of the coupling adjustment structure 40.

[0084] Furthermore, the bending piece 42, the first mounting piece 43 and the second mounting piece 44 can be integrally stamped out of a flat sheet, and the unfolded shapes of the bending piece 42, the first mounting piece 43 and the second mounting piece 44 can be directly punched out at one time, and at the same time, a notch is punched out at the end of the prototype flat sheet, and then the prototype flat sheet is plastically bent or elastically bent, and the upper part of the notch naturally forms the first mounting piece 43, and the lower part of the notch naturally forms the second mounting piece 44, with fewer processing steps, which greatly improves production efficiency.

[0085] It can be understood that the second mounting piece 44 can also be connected to the inner wall of the bending piece 42 (i.e., the side away from the hole wall of the mounting hole 21), and the second mounting piece 44 protrudes out of the outer periphery of the bending piece 42 by extending around the bottom or end of the bending piece 42, thereby being able to abut against the lower end of the mounting hole 21.

[0086] In some embodiments, in combination Figure 3 , one end of the bending piece 42 is connected to the side of the coupling piece 41 in the width direction Y, the other end of the bending piece 42 extends uniformly in height, and the first mounting piece 43 and the second mounting piece 44 are respectively connected to the top and bottom of the bending piece 42. Based on this, the bending piece 42 is located between the first mounting piece 43 and the second mounting piece 44 in the height direction Z, so that the bending piece 43 is adapted to the clamping interval 45, and the height is uniform, so that the height dimension of the bending piece 42 is small, which is beneficial to the bending processing of the bending piece 42 on the one hand, and when the bending piece 42 is bent, the bending piece 42 with a smaller height has a greater rebound force and can be more tightly pressed against the hole wall of the mounting hole 21 along the radial direction of the mounting hole 21, and on the other hand, it can reduce the material of the bending piece 42, which is beneficial to the lightweight design of the coupling adjustment structure 40.

[0087] In some embodiments, in combination Figure 5The bending piece 42 includes a first bending section 421 and a second bending section 422 connected to each other. The first bending section 421 is connected to the side of the coupling piece 41 in the width direction Y. The top of the second bending section 422 is lower than the top of the first bending section 421, and the bottom of the second bending section 422 is higher than the bottom of the first bending section 421. The first mounting piece 43 and the second mounting piece 44 are respectively connected to the top and bottom of the second bending section 422. Based on this, the height dimension of the second bending section 422 is smaller than the height dimension of the first bending section 421. On the one hand, the height dimension of the first bending section 421 is larger, which can increase the rigidity and strength of the bending piece 42, which is conducive to better ensuring the stability of the shape after bending and better supporting the first mounting piece 43 and the second mounting piece 44; on the other hand, the height dimension of the second bending section 422 is smaller, and the first mounting piece 43 and the second mounting piece 44 are respectively connected to the top and bottom of the second bending section 422, which shortens the height distance from the top of the first mounting piece 43 to the bottom of the second mounting piece 44, which is conducive to reducing the overall height of the coupling adjustment structure 40 and facilitating the miniaturization design of the coupling adjustment structure 40.

[0088] Specifically, combined Figure 5 The first bending section 421 and the second bending section 422 are arranged at intervals, and the bending piece 42 includes a first connecting section 423 and a second connecting section 424 located between the first bending section 421 and the second bending section 422. The two ends of the first connecting section 423 are respectively connected to the first bending section 421 and the first mounting piece 43, and the two ends of the second connecting section 424 are respectively connected to the first bending section 421 and the second mounting piece 44. A bending window 425 is formed between the first connecting section 423 and the second connecting section 424. Based on this, on the one hand, the bending window 425 reduces the strength of the bending piece 42 in the height direction Z, which is conducive to the bending operation. On the other hand, the first connecting section 423 and the second connecting section 424 support and connect to the circumferential position of the first mounting piece 43 and the second mounting piece 44, further improving the rigidity and strength of the first mounting piece 43 and the second mounting piece 44, so that the first mounting piece 43 and the second mounting piece 44 are stably pressed against the two ends of the mounting hole 21 and are not easy to loosen.

[0089] Specifically, the second bending section 422 is recessed inwardly relative to the first bending section 421, and the first mounting piece 43 and the second mounting piece 44 naturally protrude from the outer periphery of the recessed second bending section 422, and no outward bending process is required, that is, the first mounting piece 43 and the second mounting piece 44 do not need to withstand the stamping bending force, and the first mounting piece 43 and the second mounting piece 44 maintain the characteristics of the original material structure, are not deformed by external force, and have no processing defects, which is beneficial to maintaining the rigidity and strength of the first mounting piece 43 and the second mounting piece 44, and improving the abutment stability of the first mounting piece 43 and the second mounting piece 44 on the end of the mounting hole 21.

[0090] In some embodiments, in combination Figure 2 , Figure 6 and Figure 7 The top surface of the first mounting piece 43 has a plane. During assembly, the top surface of the first mounting piece 43 bears the pressing force applied from the outside, so that the coupling adjustment structure 40 can be assembled into the mounting hole 21 from top to bottom. The plane has a large force-bearing area, so that the coupling adjustment structure 40 is subjected to a more uniform force during press assembly, thereby avoiding damage to the sheet-like coupling adjustment structure 40 during assembly or causing the coupling adjustment structure 40 to bend and become unstable.

[0091] In some embodiments, in combination Figure 1 , Figure 5 and Figure 7 The top surface of the coupling sheet 41 has a plane. During assembly, the top surface of the coupling sheet 41 bears the pressing force applied from the outside, so that the coupling adjustment structure 40 can be assembled into the mounting hole 21 from top to bottom. The plane has a large force-bearing area, so that the coupling adjustment structure 40 is subjected to a more uniform force during press assembly, thereby avoiding damage to the sheet-like coupling adjustment structure 40 during assembly or causing the coupling adjustment structure 40 to bend and become unstable.

[0092] In some embodiments, in combination Figure 3 and Figure 4 The coupling piece 41 is provided with a pressing portion 201 in the height direction Z, and the top surface of the first mounting piece 43 and the top surface of the pressing portion 201 are flush in the height direction Z. During assembly, the top surface of the first mounting piece 43 and the top surface of the pressing portion 201 can simultaneously withstand the external pressing force, so that the coupling adjustment structure 40 is assembled into the mounting hole 21 from top to bottom, so that the coupling adjustment structure 40 is subjected to a more uniform force during the press assembly, and the coupling adjustment structure 40 of the sheet structure is prevented from being damaged during assembly or bending and instability of the coupling adjustment structure 40.

[0093] In addition, the setting of the pressing portion 201, on the one hand, makes it convenient for the debugging tool to clamp the pressing portion 201, thereby driving the coupling adjustment structure 40 to rotate, so as to adjust the coupling strength between the two resonant components 30 or to adjust the position of the transmission zero point in the passband, thereby facilitating the debugging operation of the coupling adjustment structure 40; on the other hand, it is convenient for the staff or the assembly and disassembly tools to pull up or press down the pressing portion 201, so as to realize that the coupling adjustment structure 40 is detached from the mounting hole 21 in the positive and negative directions along the height direction Z, thereby facilitating the assembly and disassembly operation of the coupling adjustment structure 40.

[0094] In some embodiments, in combination Figure 3 , Figure 5 and Figure 7, the top surface of the first mounting piece 43 and the top surface of the coupling piece 41 are flush in the height direction Z. During assembly, the top surface of the first mounting piece 43 and the top surface of the coupling piece 41 can simultaneously withstand the external pressing force, so that the coupling adjustment structure 40 is assembled into the mounting hole 21 from top to bottom, so that the coupling adjustment structure 40 is subjected to a more uniform force during the pressing assembly, thereby avoiding damage to the sheet-like coupling adjustment structure 40 during assembly or causing the coupling adjustment structure 40 to bend and become unstable.

[0095] In some embodiments, in combination Figure 1 , Figure 3 , Figure 5 and Figure 7 , the coupling piece 41 is in a flat plate shape. In this way, the coupling piece 41 can be directly punched out of a flat sheet without the need for bending, thereby simplifying the processing procedures of the coupling piece 41. At the same time, the flat-plate-shaped coupling piece 41 has the largest projection area in the thickness direction X and the smallest projection area in the width direction Y, so that during the rotation of the coupling piece 41, the coupling area range between the two resonators 30 is increased, thereby increasing the debugging range of the coupling adjustment structure 40.

[0096] It should be noted that the coupling sheet 41 may be made of a metal material, or may include a plastic sheet and a metal layer disposed on the surface of the plastic sheet. The present application does not limit the material of the coupling sheet 41 .

[0097] In one embodiment, the coupling sheet 41 is made of a metal sheet. Since the thermal expansion coefficient of metal is much smaller than that of plastic, the metal sheet has a smaller size change when the temperature changes compared to the plastic sheet, and can maintain a stable position in a high and low temperature environment, thereby avoiding the position change of the coupling sheet 41 as much as possible, thereby avoiding the index jump of the filter as much as possible, and ensuring the stability of the index of the filter.

[0098] In this embodiment, the bending sheet 42 can be integrally formed with the coupling sheet 41 to reduce the number of parts and assembly operations, improve connection stability and assembly consistency, and the sheet structure simplifies the one-piece molding process, improves the qualified rate of one-piece molding manufacturing, and improves the manufacturing accuracy of the one-piece molding process. The structure is compact, which is conducive to the miniaturization, simplification and lightweight design of the coupling adjustment structure 40 and the filter; the bending sheet 42 can also be separately connected to the coupling sheet 41, for example, using but not limited to bonding, welding, screw fastening, snap-on, crimping, plug-in, sleeve connection, interference fit and other split connection methods, which facilitates the separate manufacturing of the two and reduces the manufacturing difficulty, and is not limited here.

[0099] In this embodiment, the first mounting plate 43 and / or the second mounting plate 44 can be integrally formed with the bending plate 42 to reduce the number of components and assembly operations, improve connection stability and assembly consistency, and the sheet structure simplifies the one-piece molding process, improves the qualified rate of one-piece molding manufacturing, and improves the manufacturing accuracy of the one-piece molding process. The structure is compact, which is conducive to the miniaturization, simplification and lightweight design of the coupling adjustment structure 40 and the filter; the first mounting plate 43 and / or the second mounting plate 44 can also be separately connected to the bending plate 42, for example, by but not limited to bonding, welding, screw fastening, snap-on, crimping, plug-in, socketing, interference fit and other split connection methods, which are convenient for separate manufacturing and reduce manufacturing difficulty, and are not limited here.

[0100] In some embodiments, the coupling adjustment structure 40 is integrally formed, that is, the bending piece 42 , the coupling piece 41 , the first mounting piece 43 and the second mounting piece 44 are integrally formed.

[0101] In one embodiment, the bending sheet 42 and the coupling sheet 41 are an integrated metal sheet structure. The coupling adjustment structure 40 can be integrally formed by a stamping process, a casting process or an additive manufacturing process, which is conducive to realizing rapid and continuous automated production, improving production efficiency and saving production costs; the coupling adjustment structure 40 can also be integrally formed by machining.

[0102] In another embodiment, the coupling adjustment structure 40 includes a plastic sheet and a metal layer disposed on the surface of the plastic sheet, and the bending sheet 42 and the coupling sheet 41 are integrally injection molded, which ensures that the coupling sheet 41 and the bending sheet 42 including the bending sheet 42, the first mounting sheet 43 and the second mounting sheet 44 have high assembly position consistency and high connection strength, which is beneficial to improving the stability of product indicators and is more beneficial to reducing the volume and weight of the coupling adjustment structure 40 and the filter. Compared with metal materials, the plastic sheet has good plasticity and can be flexibly processed and manufactured by thermal processing or mechanical processing, that is, the coupling adjustment structure 40 can be made into various shapes by injection molding, extrusion, blow molding and other processing methods, and can also be made into various shapes by cutting, stamping, bending and other mechanical processing methods, which greatly reduces the manufacturing difficulty.

[0103] Specifically, the plastic sheet corresponding to the coupling sheet 41 does not affect the coupling area between the two resonators 30, and does not make specific requirements on the shape and size of the plastic sheet, thereby reducing the processing requirements and difficulty of the plastic sheet. The plastic sheet can be a plate-like structure with a regular shape, which reduces the types of specifications of the plastic sheet, and can form metal layers of various shapes and areas on the surface of the plastic sheet according to the actual coupling strength adjustment range. The metal layer is arranged on one side of the plastic sheet, and can also be arranged on two opposite sides of the plastic sheet along the thickness direction X, and can also be arranged on the side of the plastic sheet along the width direction Y, which is not limited here. Based on this, the staff can set metal layers of different shapes and areas according to the coupling requirements of different filters, which is conducive to improving the versatility of the plastic sheet and the specificity of the metal layer.

[0104] Specifically, the metal layer is applied to the surface of the plastic sheet by additive manufacturing, physical vapor deposition, spraying, gluing or hot pressing. Additive manufacturing, physical vapor deposition or spraying processes can accurately control the deposition thickness of the metal layer, and the size of the deposition thickness can be controlled to the micron level. The bonding process can attach the metal layer obtained by processing to the plastic sheet after the shape and size are qualified, avoiding the direct processing of the metal layer on the plastic sheet due to processing errors and other reasons that do not meet the performance requirements, resulting in the scrapping of the entire coupling adjustment structure 40, which is conducive to reducing the defective rate.

[0105] Specifically, the surface of the plastic sheet corresponding to the first mounting piece 43, the second mounting piece 44, or the bending piece 42 may or may not be provided with a metal layer, which is not limited here. When the surface of the plastic sheet corresponding to the first mounting piece 43 and the second mounting piece 44 is not provided with a metal layer, the first mounting piece 43 and the second mounting piece 44 are insulated and installed in the mounting hole 21, so that capacitive coupling of two adjacent resonators 30 can be achieved.

[0106] Optionally, the surfaces of the first mounting plate 43 and the second mounting plate 44 that are in contact with the hole wall of the mounting hole 21 are provided with a diamond coating to make their surfaces smooth, improve wear resistance, increase the service life of the coupling adjustment structure 40, and at the same time enhance the insulation setting between the bending plate 42 and the mounting hole 21.

[0107] Embodiment 2

[0108] Combination Fig.10 and Fig.11, the present application provides a filter. The filter includes a cavity 10, a cover plate 20, a resonant component 30 and a coupling adjustment structure 40 of any one of the embodiments 1, the number of the resonant components 30 is more than two, and more than two resonant components 30 are installed in the cavity 10, the cavity 10 has an opening 11, the cover plate 20 covers one end of the cavity 10 having the opening 11, the cover plate 20 has a mounting hole 21, the bending sheet 42 rotatably clamps the two ends of the mounting hole 21 through a clamping interval 45, and the coupling sheet 41 is located between the two resonant components 30, and is used to adjust the coupling strength between the two resonant components 30 or adjust the position of the transmission zero point in the passband. Among them, the coupling adjustment structure 40 can be rotatably installed in the mounting hole 21 in an electrically conductive manner to achieve coupling between the two resonant components 30, and can also be rotatably installed in the mounting hole 21 in an insulated manner to achieve capacitive coupling between the two resonant components 30.

[0109] The coupling plate 41 is located between the two resonators 30, and the projection area of ​​the coupling plate 41 on the line connecting the two resonators 30 is the coupling area of ​​the two resonators 30. Since the projection area of ​​the coupling plate 41 in the thickness direction X is greater than the projection area of ​​the coupling plate 41 in the width direction Y, that is, the projection areas of the coupling plate 41 in different directions are different. In this way, when the coupling adjustment structure 40 rotates, the coupling plate 41 rotates accordingly, and the coupling area between the two resonators 30 changes, thereby adjusting the coupling strength between the two resonators 30 or adjusting the position of the transmission zero point in the passband.

[0110] In some embodiments, in combination Figure 1 , Figure 3 , Figure 5 and Figure 7 Compared with the traditional coupling adjustment structure which requires a special operating protrusion or operating groove for the debugging device to clamp, the bending piece 42 of the coupling adjustment structure 40 provided in the present application abuts against the two ends of the mounting hole 21 through the first mounting piece 43 and the second mounting piece 44. There is a gap between the first mounting piece 43 and the coupling piece 41, and the mounting hole 21 of the cover plate 20 will not be sealed. The debugging device can easily enter the gap formed between the first mounting piece 43 and the coupling piece 41, and press and push the coupling adjustment structure 40 to rotate, so as to facilitate the debugging operation of the filter without the need to additionally set an operating protrusion or operating groove.

[0111] Optionally, after the filter is debugged, a metal film, such as tin foil, is covered on the outer wall of the cover plate 20 to further prevent signal leakage inside the cavity 10 .

[0112] In some embodiments, in combination Figure 1 , Figure 3 and Figure 5When the first mounting piece 43 abuts against the upper end surface of the mounting hole 21, the bent piece 42 is not higher than the upper end surface of the mounting hole 21, which can ensure that the filter and other products are simple and beautiful on one side of the cover plate 20, and can basically avoid colliding with other structures and affecting product indicators when the filter and other products are assembled with other structures, and can reduce the overall height of the filter and other products.

[0113] In some embodiments, in combination Fig.10 and Fig.11 , multiple resonant elements 30 are coupled in sequence to form a main signal channel. Between two adjacent resonant elements 30 located on the main signal channel, the coupling strength can be adjusted by a coupling adjustment structure 40, and coupling can also be achieved through air gaps, coupling ribs, etc., that is, a coupling adjustment structure 40 may be set between two adjacent resonant elements 30, or a coupling adjustment structure 40 may not be set, and no sole limitation is made here.

[0114] For example, combined with Fig.11 , ten resonant elements 30 coupled in sequence are installed in the cavity 10, the external RF signal is coupled to the first resonant element 30, and is transmitted to the tenth resonant element 30 in sequence to achieve filtering, and then transmitted to the outside of the cavity 10 through the tenth resonant element 30, the number of coupling adjustment structures 40 is nine, the first coupling adjustment structure 40a is located between the first resonant element 30 and the second resonant element 30, the second coupling adjustment structure 40b is located between the second resonant element 30 and the third resonant element 30, the third coupling adjustment structure 40c is located between the third resonant element 30 and the fourth resonant element 30, and the first coupling adjustment structure 40c is located between the third resonant element 30 and the fourth resonant element 30. The fourth coupling adjustment structure 40d is located between the fourth resonator 30 and the fifth resonator 30, the fifth coupling adjustment structure 40e is located between the fifth resonator 30 and the sixth resonator 30, the sixth coupling adjustment structure 40f is located between the sixth resonator 30 and the seventh resonator 30, the seventh coupling adjustment structure 40g is located between the seventh resonator 30 and the eighth resonator 30, the eighth coupling adjustment structure 40h is located between the eighth resonator 30 and the ninth resonator 30, and the ninth coupling adjustment structure 40i is located between the ninth resonator 30 and the tenth resonator 30. It can be understood that in other embodiments, a coupling adjustment structure 40 can also be arranged between two non-adjacent resonators 30 on the main signal channel to form cross coupling and generate a transmission zero point in the passband. For example, a coupling adjustment structure 40 is arranged between the second resonator 30 and the fifth resonator 30, and a coupling adjustment structure 40 is arranged between the seventh resonator 30 and the ninth resonator 30, which will not be described one by one here.

[0115] In this embodiment, combined with Figure 2 , Figure 4 , Figure 6 and Fig. 9, the first mounting piece 43 and the second mounting piece 44 realize the rotatable mounting of the coupling adjustment structure 40 by clamping the two ends of the mounting hole 21, rather than realizing the rotatable mounting in the mounting hole 21 by threaded connection, that is, the mounting hole 21 does not need to be tapped, thereby effectively simplifying the processing difficulty and precision requirements of the cover plate 20, effectively reducing the processing cost of the cover plate 20, and effectively improving the processing efficiency of the cover plate 20. In addition, when the coupling adjustment structure 40 of this embodiment rotates relative to the mounting hole 21, it can reduce or even basically avoid the risk of scratching the hole wall of the mounting hole 21 and generating burrs, debris, etc. falling into the cavity 10, thereby effectively ensuring and improving the intermodulation and power performance of the filter.

[0116] In some embodiments, in combination Figure 2 The height of the clamping interval 45 formed by the first mounting piece 43 and the second mounting piece 44 is 90% to 120% of the thickness of the mounting hole 21, so that the first mounting piece 43 and the second mounting piece 44 can gap clamp, just clamp or interference clamp the two ends of the mounting hole 21, thereby ensuring that the coupling adjustment structure 40 is stably installed in the mounting hole 21, and at the same time reducing the required accuracy of the spacing between the first mounting piece 43 and the second mounting piece 44.

[0117] The thickness of the mounting hole 21 refers to the dimension distance of the mounting hole 21 in the height direction Z, that is, the distance from the upper opening of the mounting hole 21 to the lower opening of the mounting hole 21 .

[0118] In one embodiment, in combination Figure 2 The first mounting piece 43 and the second mounting piece 44 forming the clamping interval 45 are used for interference clamping cooperation with the two ends of the mounting hole 21, and the height of the clamping interval 45 is less than the thickness of the mounting hole 21. In this way, after the first mounting piece 43 and the second mounting piece 44 abut against the upper and lower ends of the mounting hole 21, the first mounting piece 43 and the second mounting piece 44 will undergo elastic deformation, and can more reliably clamp the two ends of the mounting hole 21, thereby improving the installation stability of the coupling adjustment structure 40 at the mounting hole 21, and then improving the position stability of the coupling adjustment structure 40, and trying to avoid a large change in the indicators of the filter after debugging.

[0119] In some embodiments, in combination Figures 3 to 6The first mounting piece 43 and the second mounting piece 44 are respectively connected to the top and the bottom of the bending piece 42, and the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 abuts against the hole wall of the mounting hole 21. On the one hand, the bending piece 42 is limited in the radial direction of the mounting hole 21 to prevent the coupling adjustment structure 40 from moving radially along the mounting hole 21, thereby ensuring the installation stability and position stability and avoiding changes in product indicators due to movement. On the other hand, the contact area and supporting force between the bending piece 42 and the mounting hole 21 are enhanced, which is conducive to the stable and rotatable installation of the coupling adjustment structure 40 in the mounting hole 21.

[0120] Optionally, the hole wall of the mounting hole 21 is a spiral surface, such as a cylindrical inner wall, a conical inner wall, a truncated cone inner wall, a stepped inner wall, etc., and the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is a curved surface, which fits the hole wall of the mounting hole 21 to maximize the abutment area, further enhance the rotational stability of the coupling adjustment structure 40, reduce the friction between the bending piece 42 and the hole wall of the mounting hole 21, and further improve the rotational smoothness of the coupling adjustment structure 40.

[0121] Optionally, the hole wall of the mounting hole 21 is an irregular circular wall, such as an elliptical wall, a polygonal wall or an irregular wall, and the outer wall of the bending sheet 42 located between the first mounting sheet 43 and the second mounting sheet 44 is a non-arc surface. The outer wall of the bending sheet 42 is in line contact or point contact with the hole wall of the mounting hole 21, and the bending sheet 42 is also limited in the radial direction of the mounting hole 21 to prevent the coupling adjustment structure 40 from moving radially along the mounting hole 21. The hole wall of the mounting hole 21 provides support force to the bending sheet 42, which is conducive to the stable and rotatable installation of the coupling adjustment structure 40 in the mounting hole 21.

[0122] Optionally, the hole wall of the mounting hole 21 is an irregular circular wall, such as an elliptical wall, a polygonal wall or an irregular wall, and the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is an arc surface, as long as the coupling adjustment structure 40 can be rotatably installed in the mounting hole 21; or, the hole wall of the mounting hole 21 is a convolute surface, such as a cylindrical inner wall, a conical inner wall, a truncated cone inner wall, a stepped inner wall, etc., and the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is a non-arc surface, as long as the coupling adjustment structure 40 can be rotatably installed in the mounting hole 21.

[0123] It can be understood that in other embodiments, there is a gap between the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 and the hole wall of the mounting hole 21. At this time, when the coupling adjustment structure 40 is installed in the mounting hole 21, the outer wall of the bending piece 42 does not contact the hole wall of the mounting hole 21, and the bending piece 42 is rotatably supported at both ends of the mounting hole 21 by the first mounting piece 43 and the second mounting piece 44, which will not affect the rotation of the coupling adjustment structure 40.

[0124] In one embodiment, in combination Figure 2 , Figure 4 , Figure 6 and Figure 8 The first mounting piece 43 and the second mounting piece 44 abut against both ends of the mounting hole 21 in the height direction Z, and the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 fits with the hole wall of the mounting hole 21, thereby increasing the supporting area of ​​the cover plate 20 for the coupling adjustment structure 40 and improving the installation stability and rotation stability of the coupling adjustment structure 40.

[0125] Specifically, the mounting hole 21 is a smooth hole, and the outer wall of the bending piece 42 located between the first mounting piece 43 and the second mounting piece 44 is a curved surface, which fits the smooth hole wall of the mounting hole 21. On the one hand, it prevents the coupling adjustment structure 40 from moving radially along the mounting hole 21, which can ensure the installation stability and position stability, and on the other hand, it greatly reduces the friction between the bending piece 42 and the hole wall of the mounting hole 21, thereby reducing the rotation resistance of the coupling adjustment structure 40. Optionally, the inner wall of the mounting hole 21 is a convolute surface, such as a cylindrical inner wall, a conical inner wall, a truncated cone inner wall, a stepped inner wall, etc., to improve the smoothness of rotation.

[0126] In other embodiments, the first mounting piece 43 and the second mounting piece 44 abut against both ends of the mounting hole 21, and a gap is formed between the bent piece 42 located between the first mounting piece 43 and the second mounting piece 44 and the hole wall of the mounting hole 21. In this way, the mounting hole 21 can be a smooth hole or have a certain degree of roughness, which is not limited here, and will not affect the rotation performance of the connecting piece, thereby reducing the processing requirements and processing difficulty of the mounting hole 21.

[0127] Specifically, the inner wall of the mounting hole 21 can be a convolute surface, such as a cylindrical inner wall, a conical inner wall, a truncated cone inner wall, a stepped inner wall, etc., so that the contact area between the first mounting piece 43 and the second mounting piece 44 and the end face of the mounting hole 21 remains consistent during the rotation process, and the force is stable; the inner wall of the mounting hole 21 can also be a non-convolute surface, such as a hexagonal cross-section, an elliptical cross-section or an irregular cross-section, that is, the radius of the mounting hole 21 in different radial directions can be different. When the first mounting piece 43 and the second mounting piece 44 are rotated to a position where the radius of the mounting hole 21 is short, the contact area with the end face of the mounting hole 21 is large. When the first mounting piece 43 and the second mounting piece 44 are rotated to a position where the radius of the mounting hole 21 is long, the contact area with the end face of the mounting hole 21 is small. The coupling adjustment structure 40 can still be rotatably installed in the mounting hole 21, which is beneficial to further reduce the shape and size requirements and processing accuracy requirements of the mounting hole 21.

[0128] In some embodiments, in combination Figure 4 , a first chamfer 211 is provided at one end of the mounting hole 21 away from the cavity 10, thereby expanding the opening of the mounting hole 21 for accommodating the first mounting piece 43, so that the coupling adjustment structure 40 is flush with or lower than the outer side of the cover plate 20, which can ensure that the filter and other products are simple and beautiful on one side of the cover plate 20, and can basically avoid colliding with other structures when assembling the filter and other products with other structures to affect the product indicators, and can reduce the overall height of the filter and other products, which can be conducive to the miniaturization and lightweight of the filter and other products. At the same time, the design of the first chamfer 211 can increase the abutment area between the first mounting piece 43 and the end of the mounting hole 21, which is conducive to improving the position stability of the coupling adjustment structure 40, enhancing the guiding effect on the first mounting piece 43 and the second mounting piece 44, and facilitating the assembly and disassembly operation of the coupling adjustment structure 40.

[0129] In some embodiments, in combination Figure 4 The end of the mounting hole 21 close to the cavity 10 is provided with a second chamfer 212, thereby expanding the opening of the mounting hole 21 to accommodate the second mounting piece 44, so that the second mounting piece 44 does not protrude from the inner side of the cover plate 20, and reduces the occupation of the internal space of the cavity 10 by the second mounting piece 44. At the same time, the design of the second chamfer 212 can increase the abutment area between the second mounting piece 44 and the end of the mounting hole 21, which is conducive to improving the position stability of the coupling adjustment structure 40.

[0130] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coupling adjustment structure, characterized in that: The coupling adjustment structure includes a coupling piece, a bending piece, a first mounting piece and a second mounting piece, the coupling piece has a height direction, a thickness direction and a width direction that are perpendicular to each other, the projection area of ​​the coupling piece in the thickness direction is larger than the projection area of ​​the coupling piece in the width direction, the bending piece is connected to the side of the coupling piece in the width direction, the first mounting piece and the second mounting piece are connected to the bending piece at intervals along the height direction, and the first mounting piece and the second mounting piece protrude from the outer side wall of the bending piece.

2. The coupling adjustment structure according to claim 1, characterized in that: The first mounting piece is connected to the top of the bending piece, the outer side wall of the bending piece, or an end surface of the bending piece away from the coupling piece; And / or, the second mounting piece is connected to the bottom of the bending piece, the outer side wall of the bending piece, or an end surface of the bending piece away from the coupling piece.

3. The coupling adjustment structure according to claim 1, characterized in that: One end of the bending piece is connected to the side of the coupling piece in the width direction, the other end of the bending piece extends uniformly in height, and the first mounting piece and the second mounting piece are respectively connected to the top and bottom of the bending piece.

4. The coupling adjustment structure according to claim 1, characterized in that: The bending piece includes a first bending section and a second bending section connected to each other, the first bending section is connected to the side of the coupling piece in the width direction, the top of the second bending section is lower than the top of the first bending section, and the bottom of the second bending section is higher than the bottom of the first bending section, and the first mounting piece and the second mounting piece are respectively connected to the top and bottom of the second bending section.

5. The coupling adjustment structure according to claim 4, characterized in that: The first bending section and the second bending section are arranged at intervals, the bending sheet includes a first connecting section and a second connecting section located between the first bending section and the second bending section, two ends of the first connecting section are respectively connected to the first bending section and the first mounting sheet, two ends of the second connecting section are respectively connected to the first bending section and the second mounting sheet, and a bending window is formed between the first connecting section and the second connecting section at an upper and lower interval; And / or, the second bending section is recessed inwardly relative to the first bending section.

6. The coupling adjustment structure according to claim 1, characterized in that: The coupling adjustment structure has a first window penetrating the bending sheet, one end of the first mounting sheet is connected to the side wall of the first window, and the other end of the first mounting sheet extends outward in a direction away from the bending sheet; And / or, the coupling adjustment structure has a second window penetrating the bending piece, one end of the second mounting piece is connected to the side wall of the second window, and the other end of the second mounting piece extends outward in a direction away from the bending piece.

7. The coupling adjustment structure according to claim 1, characterized in that: A side surface of the first mounting piece close to the second mounting piece is arranged to be inclined downward or horizontally; And / or, a side surface of the second mounting piece away from the first mounting piece is arranged to be inclined upward.

8. The coupling adjustment structure according to claim 1, characterized in that: The bending piece is elastically bent around the height direction.

9. The coupling adjustment structure according to claim 8, characterized in that: The bending sheet is wound into an arc shape or a spiral shape.

10. The coupling adjustment structure according to claim 1, characterized in that: The number of the bending pieces is two, and the two bending pieces are located at the top of the coupling piece and at two opposite sides of the coupling piece in the width direction.

11. The coupling adjustment structure according to any one of claims 1 to 10, characterized in that: The top surface of the first mounting piece and the top surface of the coupling piece are flush in the height direction; Alternatively, the coupling piece is provided with a pressing portion in the height direction, and the top surface of the first mounting piece is flush with the top surface of the pressing portion in the height direction.

12. A filter, characterized in that: The filter includes a cavity, a cover plate, a resonator and a coupling adjustment structure according to any one of claims 1 to 11, wherein the number of the resonator is more than two, and the more than two resonators are installed in the cavity, the cavity has an opening, the cover plate covers one end of the cavity having the opening, the cover plate has a mounting hole, the first mounting plate and the second mounting plate are respectively clamped at both ends of the mounting hole, and the coupling plate is located between the two resonators.

13. The filter according to claim 12, characterized in that: The first mounting piece and the second mounting piece are respectively connected to the top and the bottom of the bending piece, and the outer side wall of the bending piece located between the first mounting piece and the second mounting piece abuts against the hole wall of the mounting hole.

Images