Auxiliary shielding tool for film coating

Abstract

The invention relates to an auxiliary shielding tool for film coating, which is used for shielding a functional groove on a shell when an interference film is coated on the shell of a product, and comprises a shielding component, a first shielding component, a second shielding component and a third shielding component, and the shielding component is used for being arranged at the middle position of the functional groove; the first end shielding block is used for being arranged at one end, in the first direction, of the functional groove, and the shielding assembly is tightly matched with the first end shielding block so that the first end shielding block can be tightly pressed in the functional groove, and the first end shielding block can be tightly attached to the groove wall of the functional groove; the first end shielding block is used for being arranged at one end of the functional groove in the first direction, the second end shielding block is used for being arranged at the other end of the functional groove in the first direction, and the shielding assembly is tightly matched with the second end shielding block so that the second end shielding block can be tightly pressed in the functional groove, and the second end shielding block can be tightly attached to the groove wall of the functional groove.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of product coating processing, and in particular to a coating auxiliary shielding tool. BACKGROUND

[0002] In order to improve the optical and physical properties of products, an interference film coating process is performed on the product shell during manufacturing. The interference film can change the transmission characteristics of light waves by coating one or more thin films on the surface of the shell, so as to realize the regulation and control of the functions such as transmission, reflection, absorption, scattering, polarization and phase change of light. A slot is designed on the shell of some products. In order to avoid the color problem in the slot during the coating of the interference film, a shielding piece is inserted into the slot in the traditional solution.

[0003] However, due to the influence of manufacturing size and installation size errors, etc., after the shielding piece is inserted into the slot, there is still a gap between the two ends of the shielding piece and the slot walls near the two ends of the slot, which cannot be completely fitted, so the shielding effect of the slot cannot be achieved, resulting in the overflow and color problem at the two ends of the slot during the coating of the interference film, which affects the appearance and use performance of the product. SUMMARY

[0004] Therefore, it is necessary to provide a coating auxiliary shielding tool in view of the poor shielding effect of the traditional technology and the overflow and color problem caused after coating.

[0005] The application provides a coating auxiliary shielding tool for shielding a functional slot on a product shell during the coating of an interference film on the shell, which comprises:

[0006] a shielding assembly, which is arranged at a middle position of the functional slot;

[0007] a first end shielding block, which is arranged at one end of the functional slot in a first direction, and the shielding assembly and the first end shielding block are tightly fitted to press the first end shielding block in the functional slot, so that the first end shielding block is tightly fitted with the slot wall of the functional slot; and

[0008] a second end shielding block, which is arranged at the other end of the functional slot in the first direction, and the shielding assembly and the second end shielding block are tightly fitted to press the second end shielding block in the functional slot, so that the second end shielding block is tightly fitted with the slot wall of the functional slot.

[0009] The first end shielding block is placed at one end of the functional groove of the product shell in a first direction, the second end shielding block is placed at the other end of the functional groove of the product shell in a second direction, and finally the shielding assembly is installed at the middle position of the functional groove. At this time, the shielding assembly can simultaneously play a role of fastening and installing the first end shielding block and the second end shielding block, eliminating the influence of manufacturing size and installation size errors, so as to press the first end shielding block and the second end shielding block at both ends of the functional groove, and then tightly fit with the groove wall of the functional groove. In this way, the cooperation gap between the first end shielding block and the second end shielding block and the groove wall of the functional groove can be eliminated, so that the first end shielding block and the second end shielding block can play a truly excellent shielding effect on the functional groove. After the product shell is subjected to the subsequent film plating operation, no overflow plating and color phenomenon will occur at both ends of the functional groove, thereby ensuring that the appearance of the product shell after film plating is good and the use performance is excellent.

[0010] The technical scheme of the present application will be further described below:

[0011] In one of the embodiments, the shielding assembly is provided with a first mounting portion, the first end shielding block is provided with a first matching portion, and the first mounting portion and the first matching portion are assembled in interference fit, so that the shielding assembly presses the first end shielding block at one end of the functional groove.

[0012] In one of the embodiments, the shielding assembly is further provided with a second mounting portion, the second end shielding block is provided with a second matching portion, and the second mounting portion and the second matching portion are assembled in interference fit, so that the shielding assembly presses the second end shielding block at the other end of the functional groove.

[0013] In one of the embodiments, the shielding assembly includes a main shielding block and a fixed plug, the fixed plug is used to be installed into a fixed hole of the shell, and the fixed hole is communicated with the functional groove; one of the fixed plug and the main shielding block is provided with a positioning hole, and the other of the fixed plug and the main shielding block is provided with a positioning column, the positioning hole is used to be aligned with the fixed hole, and the positioning column is inserted into the positioning hole.

[0014] In one of the embodiments, the shielding assembly further includes a first elastic sheet, one end of the first elastic sheet is installed in the main shielding block, and the other end of the first elastic sheet abuts against the first end shielding block.

[0015] In one of the embodiments, the first end shielding block is provided with a first limiting groove, and one end of the first elastic sheet abutting against the first end shielding block is arranged in the first limiting groove.

[0016] In one of the embodiments, the shielding assembly further comprises a second elastic sheet, one end of the second elastic sheet is arranged on the main shielding block, and the other end of the second elastic sheet is in abutment with the second end shielding block.

[0017] In one of the embodiments, the second end shielding block is provided with a second limiting groove, and the end of the second elastic sheet in abutment with the second end shielding block is arranged in the second limiting groove.

[0018] In one of the embodiments, at least one end of the main shielding block in the length direction is provided with an operation part.

[0019] In one of the embodiments, the main shielding block is provided with a first profiled surface matched with the profiled shape of the groove wall of the functional groove.

[0020] In one of the embodiments, the first end shielding block is provided with a second profiled surface matched with the profiled shape of the groove wall of the functional groove.

[0021] In one of the embodiments, the second end shielding block is provided with a third profiled surface matched with the profiled shape of the groove wall of the functional groove. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings which form a part of this application are intended to provide further understanding of this application and are incorporated herein in connection with this application. The schematic embodiments of this application and the description thereof are used to explain this application and do not constitute improper limitation of this application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of this application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort based on these accompanying drawings.

[0024] Figure 1 The assembly structure schematic diagram of the film-coating auxiliary shielding tool and the shell according to an embodiment of this application.

[0025] Figure 2 The exploded structure schematic diagram of the film-coating auxiliary shielding tool and the shell according to an embodiment of this application. Figure 1

[0026] The structure schematic diagram of the film-coating auxiliary shielding tool and the shell according to an embodiment of this application. Figure 3 Figure 1 The structure schematic diagram of the film-coating auxiliary shielding tool and the shell according to an embodiment of this application.

[0027] Figure 4 Figure 3 The local enlarged structure schematic diagram of the film-coating auxiliary shielding tool and the shell according to an embodiment of this application.

[0028] Figure 5 The structure schematic diagram of the shielding assembly according to an embodiment of this application.

[0029] ​​Reference Signs List:

[0030] 100, coating auxiliary shielding tool; 10, shielding assembly; 11, main shielding block; 111, positioning hole; 112, operation part; 113, first profiling surface; 12, fixed plug; 121, positioning column; 13, first elastic sheet; 14, second elastic sheet; 20, first end shielding block; 21, first limiting groove; 22, second profiling surface; 30, second end shielding block; 31, second limiting groove; 32, third profiling surface; 200, shell; 210, functional groove; 220, fixed hole. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those described herein, and the skilled person can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless specifically defined and limited otherwise, if there is a description of "mounting", "connection", "connecting", "fixing" and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the present application, unless specifically defined and limited otherwise, if there is a description of "mounting", "connection", "connecting", "fixing" and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0037] Reference Figure 1 An embodiment of the present application shows a structure schematic diagram of a product shell 200 after being assembled with a coating auxiliary shielding tool 100. The coating auxiliary shielding tool 100 is used to shield the functional groove 210 on the shell 200 when the shell 200 is coated with an interference film, so as to ensure the coating quality of the shell 200.

[0038] The shape of the shell 200 is not limited. In an alternative embodiment, the shell 200 has a structure similar to a square column, which has two sides arranged in the vertical direction, the two sides are oppositely arranged, and a long groove is recessed on each of the two sides and extends in the horizontal direction, and the long groove is a through groove structure with both ends penetrating, that is, the functional groove 210.

[0039] Optionally, other functional components can be installed in the functional groove 210, including but not limited to light components, communication components, touch components, etc., which can be selected flexibly according to actual needs. Of course, the functional groove 210 can also be used without installing other components.

[0040] In order to improve the optical and physical properties of the shell 200, the surface of the shell 200 is usually subjected to an interference film plating process, but the plating part does not include the groove wall of the functional groove 210. Therefore, the functional groove 210 needs to be shielded by means of the film plating auxiliary shielding tool 100.

[0041] Please continue to refer to Figures 1 to 3 , for example, the film plating auxiliary shielding tool 100 includes a shielding assembly 10, a first end shielding block 20, and a second end shielding block 30.

[0042] The shielding assembly 10 is used to be installed at the middle position of the functional groove 210. That is, after the shielding assembly 10 is installed in the functional groove 210, the groove segment portions near both ends of the functional groove 210 in the length direction are still in an empty state; in other words, the length of the shielding assembly 10 is less than the length of the functional groove 210.

[0043] For example, the length of the shielding assembly 10 is half of the length of the functional groove 210. After the shielding assembly 10 is installed in the functional groove 210, the functional groove 210 still has a length of one quarter on the left and right sides of the shielding assembly 10, respectively, for accommodating the first end shielding block 20 and the second end shielding block 30, respectively.

[0044] The first end shielding block 20 is used to be installed at one end of the functional groove 210 in the first direction, and the shielding assembly 10 is tightly fitted with the first end shielding block 20 to press the first end shielding block 20 tightly in the functional groove 210, so that the first end shielding block 20 tightly abuts the groove wall of the functional groove 210; the second end shielding block 30 is used to be installed at the other end of the functional groove 210 in the first direction, and the shielding assembly 10 is tightly fitted with the second end shielding block 30 to press the second end shielding block 30 tightly in the functional groove 210, so that the second end shielding block 30 tightly abuts the groove wall of the functional groove 210.

[0045] For example, the first direction of the functional groove 210 specifically refers to the length direction of the functional groove 210, that is Figure 2 the direction of the arrow S in the middle. Of course, in other optional embodiments, according to the shape of the functional groove 210, the first direction can also be any one of the width direction, the thickness direction, etc.

[0046] In summary, the implementation of the technical scheme of the embodiment will have the following beneficial effects: when the film coating auxiliary shielding tool 100 is used, the first end shielding block 20 is placed at one end of the functional groove 210 of the product shell 200 in the first direction, the second end shielding block 30 is placed at the other end of the functional groove 210 of the product shell 200 in the second direction, and finally the shielding assembly 10 is installed at the middle position of the functional groove 210. At this time, the shielding assembly 10 can simultaneously play a role in fastening and installing the first end shielding block 20 and the second end shielding block 30, eliminating the influence of manufacturing and installation size errors, so as to press the first end shielding block 20 and the second end shielding block 30 at both ends of the functional groove 210, and then tightly fit with the groove wall of the functional groove 210. In this way, the fitting gap between the first end shielding block 20 and the second end shielding block 30 and the groove wall of the functional groove 210 can be eliminated, so that the first end shielding block 20 and the second end shielding block 30 can play a truly excellent shielding effect on the functional groove 210, so that after the product shell 200 is subjected to the subsequent film coating operation, no overflow and color phenomenon will occur at both ends of the functional groove 210, thereby ensuring that the appearance of the product shell 200 after film coating is good and the use performance is excellent.

[0047] In one embodiment, the shielding assembly 10 is provided with a first mounting portion, the first end shielding block 20 is provided with a first matching portion, and the first mounting portion and the first matching portion are assembled in interference fit, so that the shielding assembly 10 presses the first end shielding block 20 at one end of the functional groove 210.

[0048] Similarly, the shielding assembly 10 is also provided with a second mounting portion, the second end shielding block 30 is provided with a second matching portion, and the second mounting portion and the second matching portion are assembled in interference fit, so that the shielding assembly 10 presses the second end shielding block 30 at the other end of the functional groove 210.

[0049] That is, the shielding assembly 10 is assembled in interference fit with the first end shielding block 20 and the second end shielding block 30 respectively, so as to press the first end shielding block 20 and the second end shielding block 30 at both ends of the length direction of the functional groove 210 respectively, so that the first end shielding block 20 and the second end shielding block 30 can tightly fit with the groove wall of the functional groove 210, avoiding the existence of the fitting gap, thereby ensuring that the end of the functional groove 210 will not appear the overflow and color phenomenon during the subsequent film coating.

[0050] Please continue to refer to Figure 1 and Figure 2In the present application, the shielding assembly 10 can be firmly installed in the housing 200, which is an important condition for the shielding assembly 10 to effectively press and fix the first end shielding block 20 and the second end shielding block 30 in the functional groove 210. Thus, in an alternative embodiment, the shielding assembly 10 comprises a main shielding block 11 and a fixed plug 12, the fixed plug 12 is arranged in the fixed hole 220 of the housing 200, the fixed hole 220 is communicated with the functional groove 210; one of the fixed plug 12 and the main shielding block 11 is provided with a positioning hole 111, and the other one of the fixed plug 12 and the main shielding block 11 is provided with a positioning column 121, the positioning hole 111 is used for alignment with the fixed hole 220, and the positioning column 121 is inserted into the positioning hole 111.

[0051] During installation, the main shielding block 11 is arranged in the middle position of the functional groove 210 and is pressed with the first end shielding block 20 and the second end shielding block 30, and then the fixed plug 12 is inserted into the fixed hole 220, at this time the positioning column 121 is inserted into the positioning hole 111 synchronously, the plug-in positioning structure formed by the positioning column 121 and the positioning hole 111 can realize physical locking of the main shielding block 11 in the functional groove 210, and provide sufficient rigidity to the main shielding block 11, so that the first end shielding block 20 and the second end shielding block 30 can be effectively pressed and closely fitted to the groove wall of the functional groove 210.

[0052] Please continue to refer to Figure 2 and Figure 5 Further, on the basis of any of the above embodiments, the main shielding block 11 is provided with a first profiled surface 113 which is matched with the profile shape of the groove wall of the functional groove 210;

[0053] And / or, the first end shielding block 20 is provided with a second profiled surface 22 which is matched with the profile shape of the groove wall of the functional groove 210;

[0054] And / or, the second end shielding block 30 is provided with a third profiled surface 32 which is matched with the profile shape of the groove wall of the functional groove 210.

[0055] Optionally, in the present application, the main shielding block 11 is provided with the first profiled surface 113, the first end shielding block 20 is provided with the second profiled surface 22, and the second end shielding block 30 is provided with the third profiled surface 32, and the first profiled surface 113, the second profiled surface 22 and the third profiled surface 32 are combined to form a continuous long strip profiled surface, so that the main shielding block 11, the first end shielding block 20 and the second end shielding block 30 can better fit the groove wall of the functional groove 210, and avoid the generation of fitting gaps after assembly.

[0056] For example, the groove wall of the functional groove 210 in the present application is an inner concave arc surface, and correspondingly, the first profiling surface 113, the second profiling surface 22 and the third profiling surface 32 all adopt an outer convex arc surface matched with the inner concave arc surface.

[0057] Of course, in other optional embodiments, the groove wall of the functional groove 210 can also be any one of a U-shaped, L-shaped, V-shaped and the like, which can be flexibly selected according to actual needs.

[0058] In the present application, the material of the first end shielding block 20 and the second end shielding block 30 can be PPS (Phenylenesulfide, polyphenylene sulfide) + 10% GF (Glass Fiber, glass fiber), which is processed by an injection molding method.

[0059] In other embodiments, the material of the first end shielding block 20 and the second end shielding block 30 can also be, but is not limited to, fluororubber and the like.

[0060] The material of the main shielding block 11 can be, but is not limited to, stainless steel.

[0061] Please continue to refer to Figures 3 to 5 In addition, in another embodiment, the shielding assembly 10 further comprises a first elastic sheet 13, one end of the first elastic sheet 13 is arranged on the main shielding block 11, and the other end of the first elastic sheet 13 abuts against the first end shielding block 20.

[0062] Further, the shielding assembly 10 further comprises a second elastic sheet 14, one end of the second elastic sheet 14 is arranged on the main shielding block 11, and the other end of the second elastic sheet 14 abuts against the second end shielding block 30.

[0063] The first elastic sheet 13 exerts an elastic pressure on the first end shielding block 20 towards the direction of the groove wall of the functional groove 210, and the second elastic sheet 14 exerts an elastic pressure on the second end shielding block 30 towards the direction of the groove wall of the functional groove 210, so as to press the first end shielding block 20 and the second end shielding block 30 tightly against the groove wall of the functional groove 210, thereby avoiding the formation of a fitting gap and affecting the plating quality of the shell 200.

[0064] Optionally, the first elastic sheet 13 and the second elastic sheet 14 are assembled and fixed with the main shielding block 11 by any one of welding, clamping, screwing and the like. For example, in the present application, the three are assembled into one by welding, so as to obtain higher connection strength and structural stability.

[0065] Optionally, the first elastic sheet 13 and the second elastic sheet 14 adopt a stainless steel material.

[0066] Please continue to refer to Figures 2 to 4In addition, on the basis of the above embodiment, the first end shielding block 20 is provided with a first limiting groove 21, and the first elastic sheet 13 is arranged in the first limiting groove 21.

[0067] Similarly, the second end shielding block 30 is provided with a second limiting groove 31, and the second elastic sheet 14 is arranged in the second limiting groove 31.

[0068] Through the abutment of the first elastic sheet 13 and the groove wall of the first limiting groove 21 and the abutment of the second elastic sheet 14 and the groove wall of the second limiting groove 31, the limiting effect of the first end shielding block 20 and the second end shielding block 30 can be formed, so as to prevent the first end shielding block 20 and the second end shielding block from falling off from the functional groove 210 in the coating process.

[0069] Since the profiled design is adopted, the main shielding block 11 is assembled with the groove wall of the functional groove 210 very tightly, and in an embodiment, at least one end of the main shielding block 11 in the length direction is provided with an operation part 112. The operation part 112 is arranged to facilitate the operation of the main shielding block 11 by hand or tool, so as to take out the main shielding block 11 from the functional groove 210 more labor-saving and effectively.

[0070] Optionally, the operation part 112 is provided with two and is formed on the two ends of the main shielding block 11 in the length direction one by one.

[0071] For example, the operation part 112 can adopt any one of the structure forms of groove, hole, protrusion, etc.

[0072] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0073] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A coating-aided masking fixture, used to mask functional grooves on a product housing during interference film coating, characterized in that, The coating-aided masking fixture includes: A shielding assembly for mounting to the center of the functional slot; A first end-shielding block is installed at one end of the functional slot in a first direction. The shielding assembly is fastened to the first end-shielding block to press the first end-shielding block into the functional slot, so that the first end-shielding block is tightly fitted against the slot wall of the functional slot; and The second end shielding block is used to be installed at the other end of the functional slot in the first direction. The shielding component is fastened to the second end shielding block to press the second end shielding block into the functional slot, so that the second end shielding block is tightly fitted to the slot wall of the functional slot.

2. The coating auxiliary masking fixture according to claim 1, characterized in that, The shielding component is provided with a first mounting part, and the first end shielding block is provided with a first mating part. The first mounting part and the first mating part are assembled with an interference fit, so that the shielding component presses the first end shielding block against one end of the functional slot.

3. The coating auxiliary masking fixture according to claim 1, characterized in that, The shielding component is further provided with a second mounting part, and the second end shielding block is provided with a second mating part. The second mounting part and the second mating part are assembled with an interference fit, so that the shielding component presses the second end shielding block against the other end of the functional slot.

4. The coating auxiliary masking fixture according to claim 1, characterized in that, The shielding assembly includes a main shielding block and a fixing block. The fixing block is used to be installed in a fixing hole in the housing, and the fixing hole communicates with the functional slot. One of the fixing block and the main shielding block is provided with a positioning hole, and the other of the fixing block and the main shielding block is provided with a positioning post. The positioning hole is used to align with the fixing hole, and the positioning post is inserted into the positioning hole.

5. The coating auxiliary masking fixture according to claim 4, characterized in that, The shielding assembly further includes a first spring, one end of which is mounted on the main shielding block, and the other end of which abuts against the first end shielding block.

6. The coating auxiliary masking fixture according to claim 5, characterized in that, The first end shielding block is provided with a first limiting groove, and the first spring piece is used to abut one end of the first end shielding block and is provided in the first limiting groove.

7. The coating auxiliary masking fixture according to claim 4, characterized in that, The shielding assembly further includes a second spring, one end of which is mounted on the main shielding block, and the other end of which abuts against the second end shielding block.

8. The coating auxiliary masking fixture according to claim 7, characterized in that, The second end shielding block is provided with a second limiting groove, and the second spring piece is used to abut one end of the second end shielding block and is provided in the second limiting groove.

9. The coating auxiliary masking fixture according to claim 4, characterized in that, An operating part is provided at least one end of the main shielding block along its length.

10. The coating auxiliary masking fixture according to any one of claims 4 to 9, characterized in that, The main shielding block is provided with a first contour surface that matches the contour shape of the groove wall of the functional groove; And / or, the first end shielding block is provided with a second contoured surface that matches the contour shape of the groove wall of the functional groove; And / or, the second end shielding block is provided with a third contoured surface that matches the contour shape of the groove wall of the functional groove.

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