Film attaching apparatus

Abstract

The application provides a film pasting device. The film pasting device is used for pasting a film on a device to be pasted with a film. The film pasting device comprises a base, an elastic member and a moving block. The base is provided with a support table for supporting the film. The moving block is provided with a limiting portion on the side away from the support table for limiting the device to be pasted with the film. The elastic member has a first state and a second state. When the elastic member is in the first state, the support table and the limiting portion have a gap portion therebetween. When the elastic member is in the second state, the support table and the limiting portion are flushly arranged.

Description

Technical Field

[0001] This application relates to the field of processing fixture technology, and in particular to a film application device. Background Technology

[0002] A lens is an optical element used to correct vision, protect the eyes, or enhance visual function. It is widely used in eyeglasses, mobile phones, cameras, microscopes, telescopes, virtual reality (VR) devices, and other devices.

[0003] In related technologies, lenses are easily damaged and scratched. Usually, a film is added to the lens to protect it. When applying the film, a film application device is usually used to assist in the application. However, existing film application devices have shortcomings in terms of quickly and accurately aligning the lens and the film, and further improvements are needed. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a film application device.

[0005] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows:

[0006] This application provides a film-applying device for applying a film to a device to be coated.

[0007] The film application device includes a base. The base includes a bottom wall and a support platform protruding from the bottom wall along a first direction.

[0008] The film-applying device further includes an elastic element. The elastic element abuts against the bottom wall and has an elastic force along the first direction.

[0009] The film-applying device further includes a movable block. The movable block is located on the side of the base near the support platform and abuts against the end of the elastic element away from the bottom wall; the movable block has a through hole, the support platform is located in the through hole, and the support platform and the through hole together define a receiving groove for accommodating the film; the inner wall of the movable block defining the through hole has a limiting part on the side away from the support platform for limiting the film-applying device.

[0010] The device to be applied to the film is placed on the limiting part. The elastic element has a first state and a second state. When the elastic element is in the first state, there is a gap between the support platform and the limiting part. When the elastic element is in the second state, the support platform and the limiting part are flush.

[0011] Optionally, in some embodiments of this application, the movable block defines a limiting groove on the inner wall of the through hole, and the limiting groove is correspondingly provided with the diaphragm.

[0012] Optionally, in some embodiments of this application, the limiting part is a limiting step, the film-applying device is provided with a fixing part, the fixing part is engaged with the limiting step, and the side of the film-applying device near the film is flush with the side of the limiting step near the support platform.

[0013] Optionally, in some embodiments of this application, the base is further provided with a positioning post protruding from the bottom wall along the first direction, and the elastic element is sleeved on the positioning post; the moving block is provided with a positioning hole extending along the first direction, and the positioning post is located in the positioning hole.

[0014] Optionally, in some embodiments of this application, the positioning post is provided with a locking groove with an opening facing the moving block, and the film application device further includes a locking member. One end of the locking member has an outer diameter larger than the outer diameter of the positioning hole and is located on the side of the moving block away from the base. The other end of the locking member is located in the locking groove and is locked in place with the locking groove.

[0015] Optionally, in some embodiments of this application, the locking element is a bolt, the outer diameter of the bolt head is larger than the outer diameter of the positioning hole and is located on the side of the moving block away from the base, the shank of the bolt is located in the locking groove, the locking groove is provided with an internal thread, and the external thread of the bolt shank is screwed into the internal thread.

[0016] Optionally, in some embodiments of this application, the height of the positioning post protruding from the bottom wall is greater than the height of the support platform protruding from the bottom wall.

[0017] Optionally, in some embodiments of this application, a plurality of positioning posts are protruding on the bottom wall, and the positioning posts are spaced apart on the periphery of the support platform; the movable block is provided with a plurality of positioning holes, and the positioning holes are spaced apart on the periphery of the through hole; the plurality of positioning posts and the plurality of positioning holes are connected in a one-to-one manner.

[0018] Optionally, in some embodiments of this application, the moving block is further provided with a gripping groove, which communicates with the through hole.

[0019] Optionally, in some embodiments of this application, the movable block defines an opening on the side of the inner wall of the through hole away from the support platform, the limiting part is located between the opening and the support platform, and the opening is provided with a guide chamfer.

[0020] In summary, due to the adoption of the above technical solution, this application includes at least the following beneficial effects:

[0021] The film application device provided in this application embodiment has a simple structure, first positioning and then applying, which is convenient to operate, and the film application is fast and accurate, improving the film application efficiency. Moreover, by applying force, the speed and effect of the film application process can be more controllable, thereby improving the accuracy of film application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application and are not intended to limit this application, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a film application device, a device to be film applied, and a film sheet provided in an embodiment of this application;

[0024] Figure 2 This is an exploded structural diagram of a film-applying device, a device to be applied to, and a film, provided in an embodiment of this application.

[0025] Figure 3 for Figure 1 A sectional view;

[0026] Figure 4 This is a schematic diagram of the structure of a film application device and a film provided in an embodiment of this application;

[0027] Figure 5 for Figure 3 A sectional view;

[0028] Figure 6 This is a schematic diagram of the film-applying device when the elastic element provided in the embodiment of this application is in the first state;

[0029] Figure 7 for Figure 6 A sectional view;

[0030] Figure 8 This is a schematic diagram of the film-applying device when the elastic element provided in the embodiment of this application is in the second state;

[0031] Figure 9 for Figure 8 A sectional view.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 - Film application device;

[0034] 10-Base; 11-Bottom wall; 12-Support platform; 13-Positioning post; 131-Locking groove;

[0035] 20 - Elastic element;

[0036] 30 - Moving block; 31 - Through hole; 311 - Limiting groove; 312 - Limiting part; 313 - Opening part; 3131 - Guide chamfer; 32 - Positioning hole; 33 - Gripping groove; 34 - Gap part;

[0037] 40 - Locking element;

[0038] 200 - Equipment to be coated with film; 210 - Fixing part;

[0039] 300-membrane. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and comprehensively described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a unique orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as exemplary in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles disclosed in this application.

[0043] To facilitate understanding of the present application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: spline curves without arrows indicate solid parts, that is, parts with solid structures; spline curves with arrows indicate virtual parts, that is, parts without solid structures.

[0044] With the development of technology, virtual reality (VR) technology allows users to experience the most realistic sensations in a virtual reality world. It boasts a powerful simulation system, truly realizing human-computer interaction, allowing users to operate freely and receive the most realistic feedback from the environment. It is precisely these characteristics of VR technology—its immediacy, multi-sensory perception, and interactivity—that have made it so popular with users.

[0045] As a core component of VR products, the optical engine lens plays a decisive role in the presentation of the display effect. The optical engine lens contains multiple sets of optical lenses. The outermost lens is directly exposed outside the housing and is easily scratched and worn. Therefore, a high-hardness film is usually attached to the surface of the outer lens for protection.

[0046] Existing technologies suffer from misalignment when applying films to lenses, causing displacement between the lens and the film, which affects the film's protective effect on the lens. Furthermore, existing film application devices have complex structures and low efficiency in aligning and applying films.

[0047] Please see Figure 1 , Figure 2 and Figure 3 This application provides a film-applying device 100 for applying a film 300 to a film-applying device 200.

[0048] The film application device 100 includes a base 10. The base 10 includes a bottom wall 11 and a support platform 12 protruding from the bottom wall 11 along a first direction.

[0049] The film application device 100 also includes an elastic element 20. The elastic element 20 abuts against the bottom wall 11 and has an elastic force along a first direction.

[0050] The film application device 100 also includes a movable block 30. The movable block 30 is located on the side of the base 10 near the support platform 12 and abuts against the end of the elastic member 20 away from the bottom wall 11. The movable block 30 is provided with a through hole 31, and the support platform 12 is located in the through hole 31. The support platform 12 and the through hole 31 together define a receiving groove for receiving the film 300. The movable block 30 defines a limiting part 312 on the side of the inner wall of the through hole 31 away from the support platform 12 for limiting the film application device 200.

[0051] The device 200 to be applied is placed on the limiting part 312. The elastic element 20 has a first state and a second state. When the elastic element 20 is in the first state, there is a gap 34 between the support platform 12 and the limiting part 312. When the elastic element 20 is in the second state, the support platform 12 and the limiting part 312 are flush.

[0052] It should be noted that the first direction can be the vertically upward direction of the film application device 100 in use.

[0053] It should be noted that you should refer to [link / reference]. Figure 4 and Figure 5 The diaphragm 300 is located in the receiving groove defined by the support platform 12 and the through hole 31. The bottom of the diaphragm 300 can be attached to the support platform 12, and the side wall of the diaphragm 300 can abut against the inner wall of the through hole 31 defined by the moving block 30, thereby effectively supporting and positioning the diaphragm 300.

[0054] The film-applying device 100 provided in this embodiment includes a base 10, an elastic element 20, and a movable block 30. Both ends of the elastic element 20 abut against the bottom wall 11 of the base 10 and the side of the movable block 30 closest to the base 10, respectively. The support platform 12 of the base 10 supports the film 300, and the limiting part 312 of the movable block 30 limits the film-applying device 200. The support platform 12 and the limiting part 312 quickly and effectively position the film 300 and the film-applying device 200, respectively. This solution utilizes the elasticity of the elastic element 20. When the film-applying device 200 is placed on the movable block 30 without any other force applied, the elastic element 20 is in a first state. The elastic force of the elastic element 20 can support the weight of the film-applying device 200 and the movable block 30, allowing the support platform 12 and the film-applying device 200 to be positioned quickly and effectively. A gap 34 is formed between the limiting parts 312, that is, a gap is left between the diaphragm 300 and the device 200 to be applied with film. This prevents the device 200 to be applied from falling directly and damaging the diaphragm 300 due to gravity when it is placed, and prevents displacement that would affect the film application effect if it is applied before it is aligned with the diaphragm 300. After the device 200 to be applied with film is fixed in the limiting part 312, a force can be applied to press the device 200 to be applied with film. The elastic element 20 is compressed under the action of external force, so that the moving block 30 moves toward the direction closer to the base 10. The gap 34 gradually narrows until the elastic element 20 is in the second state. The support platform 12 is flush with the limiting part 312. At this time, the device 200 to be applied with film comes into contact with the diaphragm 300 and is bonded to achieve film application.

[0055] The film application device 100 provided in this application embodiment has a simple structure, first positioning and then applying, which is convenient to operate, and the film application is fast and accurate, improving the film application efficiency. Moreover, by applying force, the speed and effect of the film application process can be more controllable, thereby improving the accuracy of film application.

[0056] It should be noted that the device 200 to be coated can be selected from, but is not limited to, VR lenses, eyeglass lenses, camera lenses, or mobile phone lenses.

[0057] The diaphragm 300 has a silicone adhesive on the side near the device 200 to be coated. A protective film may be provided on the diaphragm 300. During the coating process, the protective film is removed to expose the silicone adhesive, and the device 200 to be coated is bonded to the diaphragm 300 by the silicone adhesive.

[0058] Please refer again to some embodiments of this application. Figure 4 The movable block 30 defines a limiting groove 311 on the inner wall of the through hole 31, which corresponds to the diaphragm 300. It can be understood that the limiting groove 311 corresponds to the diaphragm 300 because its shape mimics the shape of the diaphragm 300. This allows for precise positioning of the diaphragm 300, preventing displacement between the diaphragm 300 and the device 200 during the application process, thus avoiding any impact on the application effect.

[0059] Furthermore, since the support platform 12 needs to pass through the through hole 31 to support the diaphragm 300, the shape of the support platform 12 is also set to correspond with the limiting groove 311 and the diaphragm 300, so that the diaphragm 300 is stably fixed on the support platform 12.

[0060] For example, the shape of the diaphragm 300 can be circular, elliptical, square, rounded square, or a circle cut by a chord, etc.

[0061] Please refer again to some embodiments of this application. Figure 2 The limiting part 312 is a limiting step, and the film-applying device 200 is provided with a fixing part 210. The fixing part 210 is engaged with the limiting step, and the side of the film-applying device 200 near the film 300 is flush with the side of the limiting step near the support platform 12. The cooperation between the limiting step and the fixing part 210 can fix the film-applying device 200 on the limiting step, effectively positioning it and preventing the film-applying device 200 from falling directly to the film 300 and causing displacement.

[0062] Furthermore, a gap 34 is provided between the support platform 12 and the limiting part 312, that is, a gap 34 is provided between the film-applying device 200 and the film 300. The gap 34 is generated for positioning the film-applying device 200 and the film 300 respectively. After positioning, the film is applied by applying force, which can improve the accuracy of film application.

[0063] Please refer again to some embodiments of this application. Figure 3The base 10 is further provided with a positioning post 13 protruding from the bottom wall 11 along a first direction, and an elastic element 20 is sleeved on the positioning post 13. For example, the elastic element 20 can be a spring, which is sleeved on the positioning post 13 and has an elastic force along the first direction. More specifically, the length of the spring in the first state is greater than the length of the spring in the second state, and the elastic force of the spring in the first state is less than the elastic force of the spring in the second state.

[0064] Furthermore, the movable block 30 is provided with a positioning hole 32 extending along the first direction, and the positioning post 13 is located within the positioning hole 32. It should be noted that the cooperation between the support platform 12 and the through hole 31 can be used for the initial positioning between the base 10 and the movable block 30. Through the cooperation between the positioning post 13 and the positioning hole 32, the positioning between the base 10 and the movable block 30 can be further improved. In addition, the end of the elastic member 20 that abuts against the bottom wall 11 can be fixed to the bottom wall 11 by adhesive bonding or by being sleeved on the positioning post 13. The positioning post 13 can position the elastic member 20, preventing the elastic member 20 from shifting and generating elastic force in a direction other than the first direction. Moreover, after repeated use, when the elastic force of the elastic member 20 weakens, it is also easy to replace, thereby improving the service life of the film application device 100.

[0065] It should be noted that the positioning post 13 passes through the positioning hole 32, and the elastic element 20 is sleeved on the positioning post 13. However, the elastic element 20 is still located between the moving block 30 and the bottom wall 11. In other words, the end diameter of the elastic element 20 is larger than the outer diameter of the positioning hole 32, and the elastic element 20 will not enter the positioning hole 32. In this way, the elastic element 20 can better control the distance between the base 10 and the moving block 30, thereby controlling the distance between the film-applying device 200 and the film 300.

[0066] Please refer again to some embodiments of this application. Figure 3 The positioning post 13 is provided with a locking groove 131 with an opening facing the moving block 30. The film application device 100 also includes a locking member 40. The outer diameter of one end of the locking member 40 is larger than the outer diameter of the positioning hole 32 and is located on the side of the moving block 30 away from the base 10. The other end of the locking member 40 is located in the locking groove 131 and is locked in place with the locking groove 131. It can be understood that the locking member 40 is assembled into the positioning hole 32 in a direction opposite to the first direction. The locking member 40 can connect the moving block 30 to the base 10 through its engagement with the locking groove 131, preventing the moving block 30 from being disengaged from the base 10 by the elastic force of the elastic member 20.

[0067] It should be noted that when no film application is being performed, the locking member 40 can lock the locking groove 131, and then the film application device 100 can be stored and placed to prevent the moving block 30 from falling off the base 10.

[0068] Furthermore, in some embodiments of this application, the locking member 40 is a bolt. The outer diameter of the bolt head is larger than the outer diameter of the positioning hole 32, and it is located on the side of the moving block 30 away from the base 10. The shank of the bolt is located in the locking groove 131, which is provided with an internal thread. The external thread of the bolt shank is screwed into the internal thread. The screwed connection allows for easy disassembly and installation, and is convenient to use, provides a stable connection, has a high degree of standardization, and is easy to repair in case of failure.

[0069] Please refer again to some embodiments of this application. Figure 3 The positioning post 13 protrudes from the bottom wall 11 at a greater height than the support platform 12. This facilitates the positioning between the positioning post 13 and the positioning hole 32, as well as the positioning between the locking member 40 and the locking groove 131. It can be understood that when the moving block 30 moves under pressure, the positioning hole 32 slides along the positioning post 13. The higher height of the positioning post 13 also guides the sliding of the moving block 30, further improving the accuracy of the film application by the film application device 200.

[0070] In some embodiments of this application, a plurality of positioning posts 13 protrude from the bottom wall 11, and the positioning posts 13 are spaced apart on the periphery of the support platform 12. The movable block 30 is provided with a plurality of positioning holes 32, and the positioning holes 32 are spaced apart on the periphery of the through hole 31. The plurality of positioning posts 13 and the plurality of positioning holes 32 are connected in a one-to-one manner. Correspondingly, there are a plurality of elastic members 20, and the plurality of elastic members 20 are fitted onto the positioning posts 13. The plurality of elastic members 20 can enhance the elastic force of the elastic members 20, improve the supporting effect on the movable block 30 and the film-applying device 200, and the plurality of elastic members 20 fitted onto the positioning posts 13 which are evenly distributed on the periphery of the support platform 12 can improve the uniformity of force distribution.

[0071] Please refer again to some embodiments of this application. Figure 4 and Figure 5 The movable block 30 is also provided with a gripping groove 33, which is connected to the through hole 31. The gripping groove 33 can be provided on the corresponding two sides of the movable block 30, so as to facilitate the operator to hold and pick up the film 300 and the film-to-be-applied device 200.

[0072] Please refer again to some embodiments of this application. Figure 4 and Figure 5The movable block 30 defines an opening 313 on the inner wall of the through hole 31 away from the support platform 12. A limiting part 312 is located between the opening 313 and the support platform 12. The opening 313 is provided with a guide chamfer 3131. It can be understood that both the diaphragm 300 and the film-to-be-applied device 200 enter the through hole 31 through the opening 313. The guide chamfer 3131 can guide the diaphragm 300 and the film-to-be-applied device 200 as they pass through the opening 313, so that the diaphragm 300 and the film-to-be-applied device 200 accurately enter the through hole 31 and are respectively fixed in the limiting groove 311 and the limiting part 312, thereby quickly and accurately positioning the diaphragm 300 and the film-to-be-applied device 200.

[0073] When the film-applying device 100 provided in this application embodiment applies film to the film-applying device 200, the assembly process is as follows:

[0074] Please see Figure 6 and Figure 7 The diaphragm 300 is placed in the receiving groove through the guide chamfer 3131 of the opening 313. The bottom of the diaphragm 300 is attached to the support platform 12, and the side wall of the diaphragm 300 is positioned by abutting against the limiting groove 311. The side of the diaphragm 300 to be attached faces upward. The side of the device 200 to be attached faces downward, and it is positioned in the limiting part 312 through the guide chamfer 3131 of the opening 313. At this time, the elastic member 20 is in the first state, and there is a gap 34 between the device 200 to be attached and the diaphragm 300.

[0075] Please see Figure 8 and Figure 9 A force is applied to press the film-applying device 200 towards the diaphragm 300. The film-applying device 200 and the moving block 30 move downward together, and the gap 34 gradually narrows until the film-applying device 200 and the diaphragm 300 come into contact and adhere. The moving block 30 moves downward to push the elastic element 20 to compress. At this time, the elastic element 20 is in the second state. The magnitude of the pressing force and the pressing and adhering time can be adjusted and controlled according to the needs to achieve fast and accurate film application to the film-applying device 200. The film-applying device 200 with the film 300 already adhered can be taken out through the gripping part to complete the film application operation.

[0076] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0077] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent application are incorporated herein by reference, except for historical application documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

Claims

1. A film-applying device for applying a film to a device to be coated, characterized in that, include: The base includes a bottom wall and a support platform protruding from the bottom wall along a first direction; An elastic element abuts against the bottom wall and has an elastic force along the first direction; as well as A movable block is located on the side of the base near the support platform and abuts against the end of the elastic member away from the bottom wall; the movable block has a through hole, the support platform is located in the through hole, and the support platform and the through hole together define a receiving groove for accommodating the film; the inner wall of the movable block defining the through hole on the side away from the support platform has a limiting part for limiting the device to be applied with film; The device to be applied to the film is placed on the limiting part. The elastic element has a first state and a second state. When the elastic element is in the first state, there is a gap between the support platform and the limiting part. When the elastic element is in the second state, the support platform and the limiting part are flush.

2. The device according to claim 1, wherein The movable block defines a limiting groove on the inner wall of the through hole, and the limiting groove is correspondingly provided with the diaphragm.

3. The device according to claim 1, wherein The limiting part is a limiting step, and the film-applying device is provided with a fixing part. The fixing part is engaged with the limiting step, and the side of the film-applying device near the film is flush with the side of the limiting step near the support platform.

4. The device according to claim 1, wherein The base is also provided with a positioning post protruding from the bottom wall along the first direction, and the elastic element is sleeved on the positioning post; the moving block is provided with a positioning hole extending along the first direction, and the positioning post is located in the positioning hole.

5. The device according to claim 4, wherein The positioning post is provided with a locking groove with an opening facing the moving block. The film application device also includes a locking member. One end of the locking member has an outer diameter larger than the outer diameter of the positioning hole and is located on the side of the moving block away from the base. The other end of the locking member is located in the locking groove and is locked in place with the locking groove.

6. The film-applying device according to claim 5, characterized in that, The locking component is a bolt. The outer diameter of the bolt head is larger than the outer diameter of the positioning hole and is located on the side of the moving block away from the base. The shank of the bolt is located in the locking groove, which is provided with an internal thread. The external thread of the bolt shank is screwed into the internal thread.

7. The film-applying device according to any one of claims 4 to 6, characterized in that, The height of the positioning post protruding from the bottom wall is greater than the height of the support platform protruding from the bottom wall.

8. The device according to claim 4, wherein The bottom wall is provided with a plurality of positioning posts, which are spaced apart on the periphery of the support platform; the movable block is provided with a plurality of positioning holes, which are spaced apart on the periphery of the through hole; the plurality of positioning posts and the plurality of positioning holes are connected in a one-to-one manner.

9. The device of claim 1, wherein, The moving block is also provided with a gripping groove, which is connected to the through hole.

10. The device of claim 1, wherein, The movable block defines an opening on the inner wall of the through hole away from the support platform. The limiting part is located between the opening and the support platform, and the opening is provided with a guide chamfer.

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