A speaker positioning jig

Abstract

The application discloses a loudspeaker positioning jig used for positioning a loudspeaker semi-finished product, wherein the loudspeaker semi-finished product comprises a basket, a voice coil, silk wire and a spider; the loudspeaker positioning jig comprises a seat body and an assembling structure; the seat body has a top end and a bottom end; the assembling structure is arranged at the top end of the seat body; the assembling structure comprises at least three positioning structures which are arranged at intervals from the center of the seat body to the edge; one of the positioning structures is arranged at the center of the seat body and is used for positioning and assembling the spider; another positioning structure is used for abutting against the voice coil; and the other positioning structure is used for positioning and assembling the basket and positioning the curvature of the silk wire. According to the technical scheme, the loudspeaker positioning jig can position multiple parts of the loudspeaker simultaneously, the number of related jigs is reduced, and the assembling difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and in particular to a loudspeaker positioning fixture. Background Technology

[0002] Currently available speaker positioning fixtures have relatively limited functionality. Multiple fixtures are needed to position various parts of the speaker. These fixtures are only used to position voice coils, spiders, and nylon wires individually and are not compatible. This setup not only increases the number of fixtures but also raises the cost of fixture manufacturing.

[0003] Meanwhile, the manufacturing process of loudspeakers is complex. A typical production process requires first assembling the voice coil and tone gauge, then installing the spider, followed by a pressing fixture to form a semi-finished loudspeaker. Finally, a fixture for correcting the curvature of the nylon wire is inserted. The entire process requires waiting for the glue to dry at various points, resulting in a lengthy production line, a large workforce, and low production efficiency. Furthermore, the variety of fixture specifications increases the corresponding fixture management costs. Summary of the Invention

[0004] The main objective of this invention is to provide a speaker positioning fixture, which aims to provide a speaker positioning fixture that can simultaneously position multiple speaker parts and reduce assembly difficulty.

[0005] To achieve the above objectives, the present invention provides a loudspeaker positioning fixture, comprising:

[0006] The base has a top and a bottom; and,

[0007] An assembly structure is provided at the top of the base body. The assembly structure includes at least three positioning structures spaced apart from the center to the edge of the base body. One of the positioning structures is located at the center of the base body and is used to assemble with the spring coil. Another positioning structure is used to engage with the voice coil and abut against it. A third positioning structure is used to position and install the basket frame and to position the curvature of the brocade thread.

[0008] The positioning structures are arranged concentrically.

[0009] Optionally, the positioning structure includes a first mounting member, the first mounting member comprising:

[0010] A central positioning protrusion is located at the center of the base body. A positioning boss is provided at the end of the central positioning protrusion away from the bottom of the base body. The outer edge of the positioning boss abuts against the central protrusion of the spring wave.

[0011] A peripheral positioning protrusion is provided on the periphery of the central positioning protrusion, and the peripheral positioning protrusion is used to abut against the outer periphery of the elastic wave.

[0012] Optionally, the positioning boss has multiple abutment protrusions at the end away from the bottom of the base; and / or,

[0013] The central positioning protrusion and the positioning boss are hollow.

[0014] Optionally, the size of the mating gap between the outer edge of the positioning boss and the contact point of the spring is D1, where 0mm≤D1≤0.4mm.

[0015] Optionally, the end face of the peripheral positioning protrusion away from the bottom end of the seat is a free end, and the free end of the peripheral positioning protrusion is configured as an inclined surface that is inclined towards the bottom end of the seat in the direction from the center outward.

[0016] Optionally, the positioning structure further includes a second mounting member, the second mounting member including an annular groove at the top of the base, the annular groove being used to engage with the voice coil, the bottom of the annular groove being used to abut against the bottom of the voice coil, for positioning the height of the voice coil.

[0017] Optionally, the size of the mating gap between the groove wall of the annular groove near the center of the seat and the inner wall of the voice coil is D2, where 0mm≤D2≤0.2mm.

[0018] Optionally, the positioning structure further includes a third mounting member, which includes a plurality of mounting protrusions for correspondingly abutting against the mounting notch at the lower edge of the basin stand. Each mounting protrusion is located on the edge of the base body for cooperating with the basin stand for installation. The side of each mounting protrusion away from the center of the base body is set as an arc surface, which is used to allow the brocade thread to bend and fit snugly.

[0019] Optionally, the third mounting member further includes an annular protrusion located on the edge of the seat body, with each mounting protrusion located at the annular protrusion, the annular protrusion being used to engage and abut against the inner diameter of the lower edge of the basin frame.

[0020] Optionally, the size of the fitting clearance between the outer edge of the annular protrusion and the inner diameter of the lower edge of the basin frame is D3, where 0mm≤D3≤1mm.

[0021] In the technical solution of this invention, the loudspeaker positioning fixture includes a base and an assembly structure. The base has a top end and a bottom end for supporting the assembly structure. The assembly structure is located at the top end of the base. Specifically, the assembly structure includes at least three positioning structures spaced apart from the center to the edge of the base. One positioning structure is located at the center of the base for positioning and assembling with the spring, thereby achieving positioning and assembly of the spring. Another positioning structure is used to engage with the voice coil to position the height of the voice coil. Furthermore, since the positioning structures are concentrically arranged, the concentricity of the voice coil and the spring can be determined, avoiding eccentricity in the semi-finished loudspeaker, which could lead to problems such as coil rubbing and wire breakage. In addition, a positioning structure is provided for positioning and installing the frame, further ensuring the concentricity of the frame and the voice coil, facilitating the subsequent centering assembly of the magnetic circuit. The positioning structure is also used to position the curvature of the nylon wire, ensuring the consistency of the nylon wire curvature and facilitating the subsequent assembly of the nylon wire and terminals. In the technical solution of the present invention, the speaker positioning fixture replaces the existing nylon wire arc fixture, voice coil gauge fixture, and spider fixture, reducing the number of fixtures required for assembling speaker semi-finished products, thereby reducing production steps and labor costs. Moreover, the speaker positioning fixture in this solution can provide an accurate positioning solution, which reduces the defect rate and also reduces the difficulty of assembly. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of a speaker positioning fixture provided in an embodiment of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of a speaker positioning fixture and a speaker semi-finished product assembly provided in an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Cross-sectional view at point A in the middle;

[0026] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0028] Figure 6 for Figure 3 Enlarged diagram of point D in the middle.

[0029] Explanation of icon numbers:

[0030]

[0031]

[0032] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0036] Currently available speaker positioning fixtures have relatively limited functionality. Multiple fixtures are needed to position various parts of the speaker. These fixtures are only used to position voice coils, spiders, and nylon wires individually and are not compatible. This setup not only increases the number of fixtures but also raises the cost of fixture manufacturing.

[0037] Meanwhile, the manufacturing process of loudspeakers is complex. A typical production process requires first assembling the voice coil and tone gauge, then installing the spider, followed by a pressing fixture to form a semi-finished loudspeaker. Finally, a fixture for correcting the curvature of the nylon wire is inserted. The entire process requires waiting for the glue to dry at various points, resulting in a lengthy production line, a large workforce, and low production efficiency. Furthermore, the variety of fixture specifications increases the corresponding fixture management costs.

[0038] To address the aforementioned problems, this invention proposes a speaker positioning fixture, which aims to provide a speaker positioning fixture capable of simultaneously positioning multiple speaker components and reducing assembly difficulty. Figures 1 to 6 This is a schematic diagram of one embodiment of the speaker positioning fixture provided by the present invention.

[0039] Please refer to Figure 1 The speaker positioning fixture 100 proposed in this invention includes a base 1 and an assembly structure 2. The base 1 has a top end and a bottom end. The assembly structure 2 is located at the top end of the base 1. The assembly structure 2 includes at least three positioning structures 2a spaced apart from the center to the edge of the base 1. One positioning structure 2a is located at the center of the base 1 for positioning and assembling with the spider 300. Another positioning structure 2a is used to engage and abut with the voice coil 400. A third positioning structure 2a is used to position and install the frame 600 and to position the curvature of the nylon wire 500. The positioning structures 2a are concentrically arranged.

[0040] In the technical solution of this application, the loudspeaker positioning fixture 100 includes a base 1 and an assembly structure 2. The base 1 has a top end and a bottom end for supporting the assembly structure 2. The assembly structure 2 is located at the top end of the base 1. Specifically, the assembly structure 2 includes at least three positioning structures 2a spaced apart from the center to the edge of the base 1. One positioning structure 2a is located at the center of the base 1 for positioning and assembling with the spring 300 to achieve positioning and assembly of the spring 300. Another positioning structure 2a is used to cooperate and abut with the voice coil 400 to position the spring 300. The height of the voice coil 400 is determined by the fact that the positioning structures 2a are concentrically arranged, thus enabling the concentricity of the voice coil 400 and the spider 300 to be positioned, preventing the speaker semi-finished product from becoming eccentric and causing problems such as coil rubbing and wire breakage. In addition, a positioning structure 2a is provided to position and install the frame 600, further ensuring the concentricity of the frame 600 and the voice coil 400, facilitating the subsequent centering assembly of the magnetic circuit. The positioning structure 2a is also used to position the curvature of the nylon wire 500, ensuring the consistency of the curvature of the nylon wire 500, facilitating the subsequent assembly of the nylon wire 500 and the terminals. In the technical solution of the present invention, the speaker positioning fixture 100 replaces the existing 500 arc fixture of the brocade wire, the 400 gauge fixture of the voice coil, and the 300 spring coil fixture, thereby reducing the number of fixtures required for assembling the speaker semi-finished product, thus reducing production steps and labor costs. Moreover, the speaker positioning fixture 100 in this solution can provide an accurate positioning solution, which reduces the defect rate and also reduces the difficulty of assembly.

[0041] Please refer to Figure 1 and Figure 3The positioning structure 2a includes a first mounting member 21, which includes a central positioning protrusion 211 and a peripheral positioning protrusion ring 213. The central positioning protrusion 211 is located at the center of the base 1. A positioning boss 212 is provided at one end of the central positioning protrusion 211 away from the bottom of the base 1. The outer edge of the positioning boss 212 abuts against the central protrusion of the spring wave 300. The peripheral positioning protrusion ring 213 is provided on the periphery of the central positioning protrusion 211 and is used to abut against the outer periphery of the spring wave 300. In this embodiment, the first mounting member 21 is used to position and install the spring wave 300. It can be understood that the central positioning protrusion 211 has a certain height, so the positioning protrusion 212 that cooperates with the spring wave 300 can limit the center of the spring wave 300 to the corresponding height, which facilitates the subsequent fitting and positioning of the center of the spring wave 300 and the center of the drum paper 200 body. In addition, the peripheral positioning protrusion 213 fits with the periphery of the spring wave 300, which can prevent the periphery of the spring wave 300 from warping, so as to correct the flatness of the periphery of the spring wave 300, which facilitates the subsequent bonding of the periphery of the spring wave 300 to the sub-washer, and prevents the periphery of the spring wave 300 and the sub-washer from warping or becoming uneven.

[0042] Further, please refer to Figure 1 The positioning boss 212 has multiple abutment protrusions 212a at one end away from the bottom of the base 1. It is understood that since the positioning boss 212 and the spring 300 are centrally inserted and assembled, and the center of the spring 300 needs to be glued to the body of the paper drum 200, to prevent glue from overflowing from the center of the spring 300 and sticking to the positioning boss 212, multiple abutment protrusions 212a are provided on the end face of the positioning boss 212 near the spring 300. These abutment protrusions 212a fit snugly against the spring 300, thereby reducing the contact area between the first mounting member 21 and the spring 300. The contact area is minimized to avoid the risk of adhesion between the positioning boss 212 and the spring 300, facilitating the subsequent detachment of the speaker positioning fixture 100. In addition, the central positioning protrusion 211 and the positioning boss 212 are hollow. Similarly, the hollow positioning boss 212 can also reduce the contact area between the positioning boss 212 and the spring 300. When the positioning boss 212 is also provided with abutment protrusion 212a and is hollow, it can further reduce the contact area, making it easier for the speaker fixture to be removed after the speaker semi-finished product is assembled.

[0043] In addition, please refer to Figure 3 and Figure 4The size of the fitting gap between the outer edge of the positioning boss 212 and the spring 300 is D1, where 0mm ≤ D1 ≤ 0.4mm, preferably 0mm ≤ D1 ≤ 0.02mm. Specifically, in a general embodiment, the size of the fitting gap between the outer edge of the positioning boss 212 and the spring 300 is D1, and D1 should be at least less than 0.4mm. However, in the preferred embodiment of this application, in order to avoid eccentricity caused by the assembly gap between the positioning boss 212 and the spring 300 as much as possible, the outer diameter of the side edge of the positioning boss 212 is larger than the inner diameter of the inner edge of the central protrusion of the spring 300. The minimum size is 0.02mm. It is understandable that in the actual assembly process, the size of the center of the spring 300 may be smaller than the specified size. Therefore, if the outer diameter of the positioning boss 212 is too large, it will damage or lift the spring 300. This will increase the risk of the spring 300 being off-center and also change the assembly height of the spring 300. It will also affect the subsequent assembly of other components. Therefore, the size of the positioning boss 212 should be slightly smaller than the size of the center of the spring 300. However, the size of the positioning boss 212 cannot be too small, otherwise it will not be able to fit with the center of the spring 300, causing the spring 300 to be off-center. Therefore, when the size of the fitting gap is less than or equal to 0.02mm, it is possible to position the spring 300 and leave a certain gap size to fit the springs 300 with slightly different sizes, making the applicability of the speaker positioning fixture 100 more extensive. Furthermore, since each of the positioning structures 2a is concentrically arranged, the positioning of the spring 300 can also achieve the concentricity positioning of the center of the spring 300 and the central hole of the frame 600, which can avoid the eccentricity after the drum 200 is installed, thereby reducing the risk of subsequent vibration imbalance and ring rubbing.

[0044] It is understood that the end face of the peripheral positioning protrusion 213 away from the bottom end of the base 1 is a free end. The free end of the peripheral positioning protrusion 213 is set as an inclined surface that is inclined towards the bottom end of the base 1 in the direction from the center outward. This is so that when the peripheral positioning protrusion 213 contacts the edge of the spring 300, the edge of the spring 300 can also be corrected to a certain extent with the tilt angle. After the speaker positioning fixture 100 is disassembled, it can be assembled with the sub-wafer under a certain tilt angle, which can effectively avoid the edge of the sub-wafer sticking and improve the quality of the assembled speaker semi-finished product.

[0045] Please refer to Figure 1 and Figure 3The positioning structure 2a further includes a second mounting member 22, which includes an annular groove 223 located at the top of the base 1. The annular groove 223 is used to engage with the voice coil 400, and the bottom of the annular groove 223 abuts against the bottom of the voice coil 400 to position the height of the voice coil 400. It is understood that the annular groove 223 has a groove wall near the center of the base 1, and this groove wall abuts against the inner wall of the voice coil 400. Furthermore, since the positioning structures 2a are concentrically arranged, the annular groove 223 can achieve the concentric arrangement of the voice coil 400, the spider 300, and the frame 600, effectively preventing the voice coil 400 from being off-center. In addition, the bottom of the annular groove 223 abuts against the bottom of the voice coil 400, and simultaneously positions the height of the voice coil 400, ensuring that the coil width of the voice coil 400 is in a suitable position, which facilitates subsequent cooperation with magnetic components, ensures the sensitivity of the speaker semi-finished product, and reduces the risk of ring rubbing.

[0046] Furthermore, it is understandable that reference Figure 3 and Figure 5 The size of the mating gap between the groove wall of the annular groove 223 near the center of the base 1 and the inner wall of the voice coil 400 is D2, where 0mm ≤ D2 ≤ 0.2mm, preferably 0mm ≤ D2 ≤ 0.01mm. Therefore, in a general embodiment, it is necessary to ensure that the gap between the annular groove 223 and the groove wall at the center of the base 1 is less than 0.2mm. However, in the preferred embodiment of this application, in order to ensure the proper installation of the voice coil 400 and the annular groove 223, the size of the groove wall of the annular groove 223 near the center of the base 1 is at most less than the inner diameter of the voice coil 400 by 0.01mm. This setting is to avoid dimensional errors in the voice coil 400 and to prevent the inner wall of the annular groove 223 from being too large, which could damage or lift the voice coil 400. At the same time, the inner wall of the annular groove 223 cannot be too small, otherwise it will cause the voice coil 400 to become eccentric, thereby affecting the sensitivity of the speaker and increasing the risk of ring rubbing.

[0047] In addition, please refer to Figures 1 to 3The positioning structure 2a further includes a third mounting member 23, which includes a plurality of mounting protrusions 231 for correspondingly abutting the mounting notch at the lower edge of the basin frame 600. Each mounting protrusion 231 is located on the edge of the base 1 and is used to cooperate with the basin frame 600 for installation. The side of each mounting protrusion 231 away from the center of the base 1 is set as an arc surface, which is used to allow the nylon thread 500 to bend and fit. It can be understood that the positioning structure 2a, including the first mounting member 21, the second mounting member 22 and the third mounting member 23, are all concentrically arranged, thus ensuring the concentricity of the spring coil 300, the voice coil 400 and the basin frame 600 and reducing the risk of eccentricity. Furthermore, the lower edge of the basin frame 600 is provided with an installation notch. The number of installation notches is set to multiple. In an embodiment of the present invention, the number of installation notches is set to two. The two installation notches are positioned opposite each other at the lower edge of the basin frame 600. The third mounting member 23 includes an installation protrusion 231 corresponding to the installation notch. The installation protrusion 231 is used to pass through the installation notch to fix the basin frame 600 and prevent the basin frame 600 from rotating. Specifically, the two installation protrusions 231 are positioned opposite each other at the base 1, which can better achieve the positioning of the basin frame 600 and ensure the concentricity of the basin frame 600, the spring coil 300, and the voice coil 400.

[0048] Furthermore, since the side of the mounting protrusion 231 away from the center of the base 1 is set as an arc surface, the mounting protrusion 231 can be used to bend the brocade wire 500. In the embodiment of the present invention, the mounting protrusions 231 are arranged opposite each other, so the position of the voice coil 400 can be adjusted so that the brocade wires 500 at both ends of the voice coil 400 are wound around the arc surface, so as to realize the adjustment and positioning of the curvature of each brocade wire 500, which facilitates the subsequent threading of the brocade wire 500 to the terminal.

[0049] Furthermore, in order to better achieve the positioning effect of the basin stand 600, the third mounting member 23 also includes an annular protrusion 232 provided on the edge of the base 1. Each mounting protrusion 231 is located at the annular protrusion 232. The annular protrusion 232 is used to abut against the inner diameter of the lower edge of the basin stand 600. The annular protrusion 232 can abut against the inner edge of the basin stand 600 to achieve a larger contact area and limiting effect, thereby achieving a better positioning effect and preventing the basin stand 600 from being eccentric.

[0050] Please refer to Figure 3 and Figure 6It is understood that the size of the fitting gap between the outer edge of the annular protrusion 232 and the inner diameter of the lower edge of the basin frame 600 is D3, where 0mm≤D3≤1mm, preferably 0mm≤D3≤0.05mm. Similarly, in a general embodiment, the gap between the annular protrusion 232 and the inner diameter of the lower edge of the basin frame 600 is D3, which is at most 1mm. In a preferred embodiment, in order to prevent the size of the annular protrusion 232 from being too large and damaging the basin frame 600 or lifting the basin frame 600, causing the height of the basin frame 600 to be outside the set range, resulting in poor fitting effect between the subsequent drum paper 200 and the spring wave 300, the size of the annular protrusion 232 should not be too small, which would result in poor locking and abutment effect on the basin frame 600, causing the basin frame 600 to be eccentric or wobbly. Therefore, when the gap size is less than or equal to 0.05mm, the best fixing effect can be achieved.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A loudspeaker positioning fixture for positioning and installing a semi-finished loudspeaker product, said semi-finished loudspeaker product comprising a frame, voice coil, nylon wire, and spring, characterized in that, include: The base has a top and a bottom; as well as, An assembly structure is provided at the top of the base body. The assembly structure includes at least three positioning structures spaced apart from the center to the edge of the base body. One of the positioning structures is located at the center of the base body and is used to assemble with the spring coil. Another positioning structure is used to engage with the voice coil and abut against it. A third positioning structure is used to position and install the basket frame and to position the curvature of the brocade thread. The positioning structures are arranged concentrically. The positioning structure includes a first mounting component, the first mounting component comprising: A central positioning protrusion is located at the center of the base body. A positioning boss is provided at the end of the central positioning protrusion away from the bottom of the base body. The outer edge of the positioning boss abuts against the central protrusion of the spring wave. A peripheral positioning protrusion is provided on the periphery of the central positioning protrusion, and the peripheral positioning protrusion is used to abut against the outer periphery of the elastic wave. The positioning structure further includes a third mounting component, which includes a plurality of mounting protrusions for corresponding abutting the mounting notch at the lower edge of the basin stand. Each mounting protrusion is located on the edge of the base body for cooperating with the basin stand for installation. The side of each mounting protrusion away from the center of the base body is set as an arc surface, which is used to allow the brocade thread to bend and fit snugly.

2. The speaker positioning fixture as described in claim 1, characterized in that, The positioning boss has multiple abutment protrusions at the end away from the bottom of the base; and / or The central positioning protrusion and the positioning boss are hollow.

3. The loudspeaker positioning fixture as described in claim 1, characterized in that, The outer edge of the positioning boss is used to make a mating gap with the spring wave, and the size of the gap is D1, where 0mm≤D1≤0.4mm.

4. The speaker positioning fixture as described in claim 1, characterized in that, The end face of the peripheral positioning protrusion ring away from the bottom end of the seat is a free end, and the free end of the peripheral positioning protrusion ring is configured as an inclined surface that is inclined towards the bottom end of the seat in the direction from the center outward.

5. The speaker positioning fixture as described in claim 1, characterized in that, The positioning structure further includes a second mounting component, which includes an annular groove at the top of the base, the annular groove being used to engage with the voice coil, and the bottom of the annular groove being used to abut against the bottom of the voice coil to position the height of the voice coil.

6. The loudspeaker positioning fixture as described in claim 5, characterized in that, The size of the mating gap between the groove wall of the annular groove near the center of the seat and the inner wall of the voice coil is D2, where 0mm≤D2≤0.2mm.

7. The loudspeaker positioning fixture as described in claim 1, characterized in that, The third mounting component also includes an annular protrusion located on the edge of the base body, with each mounting protrusion located at the annular protrusion, which is used to engage and abut against the inner diameter of the lower edge of the basin frame.

8. The loudspeaker positioning fixture as described in claim 7, characterized in that, The outer edge of the annular protrusion is used to fit with the inner diameter of the lower edge of the basin frame. The size of the fitting gap is D3, where 0mm≤D3≤1mm.

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