Structure facilitating welding of tuning screw and cover plate and machining method of structure
By forming a tin ring at the contact point of the inner surface of the cover plate of the base station RF filter and the screw, the thread deformation and sharp edge problems during the debugging of the traditional filter is solved, and the intermodulation stability of the filter is improved.
Patent Information
- Application Number
- CN202510172012.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-05-30
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the debugging process of traditional base station radio frequency filters, thread deformation causes changes in filter indicators and needs to be locked repeatedly, resulting in sharp edges of the tuning screw thread, affecting the intermodulation stability of the filter.
By forming a tin ring at the contact point of the inner surface of the cover plate and the screw, covering the sharp edges generated during debugging, reducing the intermodulation product of the filter and improving the intermodulation stability.
It effectively covers the sharp edges on the tuning screw, reduces the deterioration of the intermodulation of the filter and improves the intermodulation stability of the filter.
Smart Images
Figure CN120073263A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of filters, and particularly to a structure facilitating the welding of a tuning screw and a cover plate and a processing method thereof. Background Art
[0002] Traditional base station radio frequency filters generally adopt cavity filters, and the cavity filters need to be debugged. After the debugging is completed, a relatively large torque is required to lock the tuning screw on the cover plate through a nut. In this process, the thread may be deformed, resulting in changes in the filter indexes. Therefore, it is often necessary to lock repeatedly to complete the debugging operation. However, repeated locking often makes the thread of the tuning screw produce sharp edges, which in turn leads to the deterioration of the intermodulation of the filter and affects the debugging effect of the filter. Summary of the Invention
[0003] To solve the above problems, the present invention provides a structure facilitating the welding of a tuning screw and a cover plate. By welding, a tin ring is formed at the contact place between the inner surface of the cover plate and the screw, so as to cover the sharp edges generated during debugging, reduce the intermodulation products of the filter, and improve the intermodulation stability of the filter.
[0004] According to one aspect of the present invention, there is provided a structure facilitating the welding of a tuning screw and a cover plate, including a tuning screw, a thin cover plate and a nut. The tuning screw passes through a hole on the thin cover plate, and the nut is installed on the tuning screw to lock the tuning screw and the thin cover plate. Wherein, a plurality of upwardly protruding vertical slits are formed around the hole on the thin cover plate, and a tin ring is formed at the contact place between the inner surface of the thin cover plate at the bottom of each vertical slit and the tuning screw. The center of the nut has a hollow part, and the top has a tin leakage hole communicating with the hollow part. Each vertical slit is located inside the lower part of the hollow part.
[0005] In some embodiments, the lower part of the hollow part is open. The advantage is that the specific structure of the nut is further described.
[0006] In some embodiments, all the vertical slits together form a ring. The advantage is that the shape of each vertical slit is further described, which can facilitate the formation of a tin ring.
[0007] In some embodiments, the tin leakage hole is located on the side of the tuning screw. The advantage is that the position where the tin leakage hole is opened on the nut is further described.
[0008] According to one aspect of the present invention, there is provided a processing method of the above structure facilitating the welding of a tuning screw and a cover plate, including the following steps:
[0009] S1: Process multiple slots on the thin cover plate and punch holes to form multiple vertical slits.
[0010] S2: Process the hollow part and the solder leakage hole on the nut.
[0011] S3: Assemble the tuning screw, the thin cover plate and the nut.
[0012] S4: Apply solder paste on the upper surface of the nut, then heat to melt the solder paste into solder liquid. The solder liquid passes through the solder leakage hole and flows down along the tuning screw, passes through each vertical slit and forms a solder ring at the contact position between the inner surface of the thin cover plate and the tuning screw.
[0013] In some embodiments, in step S1, one end of each slot is connected. The advantage is that the position of each slot is described, which is convenient for punching holes and forming multiple vertical slits.
[0014] In some embodiments, in step S1, the number of slots is 3 - 5. The advantage is that the appropriate number of slots is described. Among them, if the number of slots is too small, it will affect the uniformity of the infiltration of the solder liquid; if the number of slots is too large, it will reduce the clamping force of the thin cover plate on the tuning screw, resulting in the eccentricity of the tuning screw and causing a short circuit of the tuning screw.
[0015] In some embodiments, in step S4, the generated solder ring can cover the sharp edges generated on the tuning screw during debugging. The advantage is that the function of the generated solder ring is described. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic cross-sectional structure diagram of a structure for facilitating the welding of a tuning screw and a thin cover plate according to an embodiment of the present invention;
[0017] Figure 2 For Figure 1 a schematic top surface structure diagram of the tuning screw and the nut of a structure for facilitating the welding of a tuning screw and a thin cover plate as shown;
[0018] Figure 3 For Figure 1 a schematic cross-sectional structure diagram of the thin cover plate before punching as shown;
[0019] Figure 4 For Figure 3 a schematic top surface structure diagram of the thin cover plate before punching as shown;
[0020] Figure 5 For Figure 1 a schematic cross-sectional structure diagram of the thin cover plate after punching as shown;
[0021] Figure 6 ForFigure 5 Schematic top view structure of the thin cover plate after punching.
[0022] In the figure: tuning screw 1, thin cover plate 2, nut 3, vertical slit 4, hollow part 5, solder leakage hole 6, slot 7. Specific implementation mode
[0023] The present invention will be further described in detail below with reference to the accompanying drawings.
[0024] As Figure 1-2 shown, in the solution of the present invention, the tuning screw 1 passes through the hole on the thin cover plate 2, and a nut 3 is also installed on the tuning screw 1 to lock the tuning screw 1 and the thin cover plate 2. Among them, a plurality of upwardly protruding vertical slits 4 are formed around the hole on the thin cover plate 2, and the plurality of vertical slits 4 together form a ring; at the same time, at the bottom of each vertical slit 4, specifically, at the place where the inner surface of the thin cover plate 2 contacts the tuning screw 1, a solder ring formed by solidified solder is provided, and the solder ring can cover the sharp edges on the thread of the tuning screw 1, thereby avoiding the deterioration of the intermodulation of the filter.
[0025] In addition, a hollow part 5 with an opening downward is provided in the center of the nut 3, each vertical slit 4 is located inside the lower part of the hollow part 5, and a solder leakage hole 6 communicating with the hollow part 5 is opened at the top of the nut 3, and the solder leakage hole 6 is located on the side of the tuning screw 1, and molten solder can leak down to the hollow part 5 and each vertical slit 4 through the solder leakage hole 6.
[0026] The present invention also provides a processing method for a structure facilitating the welding of the tuning screw 1 and the thin cover plate 2, which includes the following main steps S1 to S4.
[0027] S1: Punch holes in the thin cover plate 2 and process to form each vertical slit 4.
[0028] As Figure 3-4 shown, before punching holes in the thin cover plate 2, a plurality of slots 7 are processed around the hole to be punched on the thin cover plate 2, and one end of each slot 7 is connected, that is, the center of the hole to be punched.
[0029] Among them, if the number of slots 7 is too small, it will affect the uniformity of the infiltration of the solder, and if the number of slots 7 is too large, it will reduce the clamping force of the thin cover plate 2 on the debugging screw, and then cause the tuning screw 1 to be eccentric, resulting in a short circuit of the debugging screw. Therefore, generally, the number of slots 7 is set to 3 to 5.
[0030] As Figure 5-6 shown, after processing the slots 7, punching holes in the thin cover plate 2 can form each upwardly protruding vertical slit 4.
[0031] S2: Process the hollow part 5 and the solder leakage hole 6 on the nut 3.
[0032] In this step, the hollow portion 5 is located at the center of the nut 3 and has an opening at the bottom, and the solder leakage hole 6 is located at the top of the nut 3 and communicates with the hollow portion.
[0033] S3: Assemble the tuning screw 1, the thin cover plate 2 and the nut 3.
[0034] In this step, as described above, pass the tuning screw 1 through the hole in the thin cover plate 2, and install the nut 3 on the tuning screw 1 to lock the tuning screw 1 and the thin cover plate 2.
[0035] S4: Apply solder paste on the upper surface of the nut 3 and then heat it.
[0036] In this step, the heated solder paste will melt into molten solder, and the molten solder will flow down along the tuning screw 1 through the solder leakage hole 6, and then pass through multiple vertical slits 4, and finally form a solder ring at the place where the inner surface of the thin cover plate 2 contacts the screw, so that the sharp edges generated on the tuning screw 1 during debugging can be covered.
[0037] A structure and its processing method for facilitating the welding of a tuning screw and a cover plate in the present invention mainly have the following beneficial effects:
[0038] 1. By welding, a solder ring is formed at the place where the inner surface of the thin cover plate 2 contacts the screw, so as to cover the sharp edges generated during debugging, reduce the intermodulation products of the filter, and improve the intermodulation stability of the filter;
[0039] 2. By adopting the method of flanging and punching the thin cover plate 2, the thickness of the thin cover plate 2 can be reduced on the premise of ensuring the effective thread of the thin cover plate 2, thereby reducing the weight of the filter;
[0040] 3. After welding, since the nut 3 does not stick to the solder, when the nut 3 is tightened, the thin cover plate 2 will undergo slight deformation at the hollow area of the nut 3, thereby realizing fine adjustment of the filter.
[0041] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.
Claims
1. A structure for facilitating welding of a tuning screw and a cover plate, characterized in that: The invention comprises a tuning screw (1), a thin cover plate (2) and a nut (3), wherein the tuning screw (1) passes through a hole on the thin cover plate (2), and the nut (3) is installed on the tuning screw (1) and locks the tuning screw (1) and the thin cover plate (2); wherein a plurality of vertical slits (4) protruding upward are formed around the hole on the thin cover plate (2), and a tin ring is formed at the contact point between the inner surface of the thin cover plate (2) and the tuning screw (1) at the bottom of each vertical slit (4); the nut (3) has a hollow portion (5) in the center, and a tin leakage hole (6) connected to the hollow portion (5) is provided at the top, and each vertical slit (4) is located inside the lower part of the hollow portion (5).
2. The structure for facilitating welding of a tuning screw and a cover plate according to claim 1, characterized in that: The hollow portion (5) is open at the bottom.
3. The structure for facilitating welding of a tuning screw and a cover plate according to claim 1, characterized in that: The vertical slits (4) together form a ring.
4. The structure for facilitating welding of a tuning screw and a cover plate according to claim 1, characterized in that: The tin leakage hole (6) is located on the side of the tuning screw (1).
5. A method for processing a structure for facilitating welding of a tuning screw and a cover plate according to any one of claims 1 to 4, characterized in that: The following steps are included S1: machining a plurality of slots (7) on the cover plate (1), and punching a plurality of vertical slits (4); S2: machining the hollow portion (5) and the tin leakage hole (6) on the nut (3); S3: Assembling the tuning screw (1), the thin cover plate (2) and the nut (3); S4: applying solder paste on the upper surface of the nut (3), and then heating the solder paste to melt it into liquid tin. The liquid tin flows through the tin leakage hole (6) and downward along the tuning screw (1), passes through each of the vertical slits (4) and forms a tin ring at the contact point between the inner surface of the thin cover plate (2) and the tuning screw (1).
6. A method for processing a structure that facilitates welding of a tuning screw and a cover plate according to claim 5, characterized in that: In step S1, one end of each of the slots (7) is connected.
7. A method for processing a structure that facilitates welding of a tuning screw and a cover plate according to claim 5, characterized in that: In step S1, the number of the slots (7) is 3 to 5.
8. The method for processing a structure that facilitates welding of a tuning screw and a cover plate according to claim 5, characterized in that: In step S4, the produced tin ring can cover the sharp edge produced on the tuning screw (1) during debugging.