Special-shaped glass edge grinding machine

Abstract

The utility model provides a special-shaped glass edge grinding machine which comprises a bearing assembly, and glass to be subjected to edge grinding is arranged on the bearing assembly. The grinding assembly and the bearing assembly are correspondingly arranged, the grinding assembly comprises a first mounting base structure, a first driving motor structure, a driving gear, a driven gear structure, a protective cover structure and a grinding wheel structure, the first driving motor structure is fixed to the first mounting base structure, and the driving gear is connected with an output shaft of the first driving motor structure; the driven gear structure is meshed with the driving gear, the grinding wheel structure is partially arranged in the protective cover structure, and the protective cover structure is provided with an opening. According to the technical scheme, the problem that the grinding wheel flies out due to high-speed rotation in the edge grinding process of the special-shaped glass in the prior art is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of glass processing, and in particular to a special-shaped glass edge grinding machine. Background Art

[0002] In order to meet people's daily needs, flat glass is often processed into special shapes to meet various needs, such as car windshields.

[0003] The edges of the cut glass are sharp, and improper handling during subsequent transportation can easily cause injuries to workers, so the glass needs to be edged. Usually, a grinding wheel is used to grind the glass edges.

[0004] In the prior art, the grinding wheel of the special-shaped edge grinding device is usually exposed to the outside. If the grinding wheel rotates too fast, the grinding wheel is easy to fly out along the tangential direction under the action of centrifugal force, such as CN205096973U. Utility Model Content

[0005] A technical problem to be solved by the present application is that during the edge grinding process of special-shaped glass, there is a problem that the grinding wheel may fly out due to high-speed rotation.

[0006] In order to solve the above technical problems, the present application provides a special-shaped glass edge grinding machine.

[0007] A special-shaped glass edge grinding machine provided according to the present application includes: a bearing assembly, on which the glass to be edged is arranged; a grinding assembly, which is arranged corresponding to the bearing assembly, and the grinding assembly includes a first mounting seat structure, a first drive motor structure, a driving gear, a driven gear structure, a protective cover structure and a grinding wheel structure. The first drive motor structure is fixed on the first mounting seat structure, the driving gear is connected to the output shaft of the first drive motor structure, the driven gear structure is meshed with the driving gear, and the grinding wheel structure is partially arranged in the protective cover structure, and the protective cover structure has an opening.

[0008] In some embodiments, the driven gear structure includes a driven gear and a connecting portion, the driven gear is meshed with the driving gear, the connecting portion is connected to the driven gear, and the connecting portion is connected to the protective cover structure.

[0009] In some embodiments, the grinding assembly further includes a bearing structure, which is disposed in the connecting portion and sleeved on the grinding wheel structure.

[0010] In some embodiments, the bearing structure includes an outer ring, an inner ring and balls. The balls include a plurality of balls, which are rotatably disposed between the outer ring and the inner ring. The outer diameter of the outer ring is greater than the inner diameter of the protective cover structure.

[0011] In some embodiments, the angle between the two ends of the opening and the line connecting the center of the protective cover structure is greater than the maximum inner angle of the glass to be ground.

[0012] In some embodiments, the grinding wheel structure includes a second drive motor and a grinding wheel. The second drive motor is connected to the first mounting seat structure. The output end of the second drive motor structure is connected to the grinding wheel. The grinding wheel is arranged in the protective cover structure.

[0013] In some embodiments, the second drive motor structure includes a first shaft segment and a second shaft segment, the first shaft segment is inserted into the bearing structure, the second shaft segment is connected to the first shaft segment, and the second shaft segment is inserted into the grinding wheel structure.

[0014] In some embodiments, the grinding assembly further includes a horizontal drive structure, and the first mounting seat structure is connected to the horizontal drive structure.

[0015] In some embodiments, the bearing assembly includes a fixed structure, a third drive motor structure and a second mounting seat structure, the fixed structure is connected to the output end of the third drive motor structure, and the third drive motor structure is connected to the second mounting seat structure.

[0016] In some embodiments, the fixing structure includes a negative pressure groove, and the negative pressure groove is arranged on a side of the fixing structure away from the second mounting seat structure.

[0017] Through the above technical scheme, the shaped glass edge grinding machine provided by the present application sets the glass to be ground on the bearing assembly, controls the grinding wheel structure and the protective cover structure to be close to the glass, and the glass extends into the protective cover structure from the opening of the protective cover structure to contact the grinding wheel, and the glass is edged. According to the shape of the outer edge of the glass, the first driving motor structure is used to drive the active gear to rotate, and the driven gear structure rotates accordingly and drives the protective cover structure to rotate, so that the protective cover structure will not interfere with the glass when grinding at various positions. The setting of the protective cover structure prevents the grinding wheel from flying out when it falls off. The technical scheme of the present application effectively solves the problem of the grinding wheel flying out due to high-speed rotation in the process of shaped glass edge grinding in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The structure schematic diagram of the special-shaped glass edge grinding machine disclosed in the embodiment of the present application is shown;

[0020] Figure 2 Shows Figure 1 A schematic diagram of the structure of the fixed structure of the special-shaped glass edge grinding machine;

[0021] Figure 3 Shows Figure 1 The back structure diagram of the special-shaped glass edge grinding machine;

[0022] Figure 4 Shows Figure 1 A schematic diagram of the structure of the grinding assembly of the special-shaped glass edge grinding machine;

[0023] Figure 5 Shows Figure 1 A schematic cross-sectional view of a grinding assembly of a special-shaped glass edge grinding machine;

[0024] Figure 6 Shows Figure 1 A schematic diagram of the main cross-sectional structure of the grinding assembly of the special-shaped glass edge grinding machine.

[0025] Description of reference numerals:

[0026] 10. Bearing assembly; 11. Fixed structure; 111. Negative pressure groove; 12. Third drive motor structure; 13. Second mounting seat structure; 20. Grinding assembly; 21. First mounting seat structure; 22. First drive motor structure; 23. Driving gear; 24. Driven gear structure; 241. Driven gear; 242. Connecting part; 25. Protective cover structure; 251. Opening; 26. Grinding wheel structure; 261. Second drive motor; 2611. First shaft section; 2612. Second shaft section; 262. Grinding wheel; 27. Bearing structure; 271. Outer ring; 272. Inner ring; 273. Ball; 28. Horizontal drive structure. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments of the present application, but includes all technical solutions that fall within the scope of the claims.

[0028] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0029] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, 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 specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0031] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0032] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] like Figures 1 to 6As shown, the special-shaped glass edge grinding machine disclosed in the embodiment of the present application includes a bearing assembly 10 and a grinding assembly 20. The glass to be edged is set on the bearing assembly 10, and the grinding assembly 20 is arranged corresponding to the bearing assembly 10. The grinding assembly 20 includes a first mounting seat structure 21, a first driving motor structure 22, a driving gear 23, a driven gear structure 24, a protective cover structure 25 and a grinding wheel structure 26. The first driving motor structure 22 is fixed on the first mounting seat structure 21, the driving gear 23 is connected to the output shaft of the first driving motor structure 22, the driven gear structure 24 is meshed with the driving gear 23, and the grinding wheel structure 26 is partially arranged in the protective cover structure 25, and the protective cover structure 25 has an opening 251.

[0035] By applying the technical solution of this embodiment, the glass to be ground is set on the bearing assembly 10, the grinding wheel structure 26 and the protective cover structure 25 are controlled to be close to the glass, the glass extends into the protective cover structure 25 from the opening 251 of the protective cover structure 25 and contacts the grinding wheel 262, and the glass is edged. According to the outer shape of the glass, the first driving motor structure 22 is used to drive the driving gear 23 to rotate, and the driven gear structure 24 rotates accordingly and drives the protective cover structure 25 to rotate, so that the protective cover structure 25 will not interfere with the glass when grinding at various positions. The setting of the protective cover structure 25 prevents the grinding wheel from flying out when it falls off. The technical solution of this embodiment effectively solves the problem of the grinding wheel flying out due to high-speed rotation in the prior art during the edge grinding of special-shaped glass.

[0036] like Figures 1 to 6 As shown, in the technical solution of this embodiment, the driven gear structure 24 includes a driven gear 241 and a connecting portion 242. The driven gear 241 is meshed with the driving gear 23, the connecting portion 242 is connected to the driven gear 241, and the connecting portion 242 is connected to the protective cover structure 25. The driven gear 241 rotates with the rotation of the driving gear 23 and drives the connecting portion 242 to rotate, and the protective cover structure 25 rotates with the connecting portion 242. The outer diameter of the connecting portion 242 is smaller than the minor diameter of the driven gear 241. This structure avoids the friction caused by the contact between the driving gear 23 and the connecting portion 242 when the driving gear 23 and the driven gear 241 are meshed and rotated, thereby improving the service life of each component.

[0037] like Figure 5 and Figure 6 As shown, in the technical solution of this embodiment, the grinding assembly 20 also includes a bearing structure 27, which is arranged in the connecting portion 242, and the bearing structure 27 is sleeved on the grinding wheel structure 26. The bearing structure 27 has the advantages of reducing friction and vibration, so that the rotation of the connecting portion 242 and the grinding wheel structure 26 is more stable.

[0038] like Figure 5 and Figure 6As shown, in the technical solution of this embodiment, the bearing structure 27 includes an outer ring 271, an inner ring 272 and a ball 273. The ball 273 includes a plurality of balls 273, which are rotatably arranged between the outer ring 271 and the inner ring 272. The outer diameter of the outer ring 271 is larger than the inner diameter of the protective cover structure 25. The outer ring 271 and the connecting portion 242 are in interference fit, and the outer ring 271 and the connecting portion 242 rotate together. The inner ring 272 and the grinding wheel structure 26 are in interference fit, and the inner ring 272 and the grinding wheel structure 26 rotate together. The balls 273 between the inner ring 272 and the outer ring 271 roll so that the inner ring 272 and the outer ring 271 are both subjected to rolling friction, with small friction and stable rotation. Since the outer diameter of the outer ring 271 is larger than the inner diameter of the protective cover structure 25, the bearing structure 27 is always located between the protective cover structure 25 and the driven gear 241 and will not slip. The arrangement of this structure further avoids structural failure of the entire device.

[0039] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, in the technical solution of this embodiment, the angle between the two ends of the opening 251 and the center line of the protective cover structure 25 is greater than the maximum inner angle of the glass to be ground. This ensures that each inner angle of the glass can extend from the opening 251 into the protective cover structure 25 to contact the grinding wheel 262 and complete the edge grinding.

[0040] like Figures 4 to 6 As shown, in the technical solution of this embodiment, the grinding wheel structure 26 includes a second drive motor 261 and a grinding wheel 262. The second drive motor 261 is connected to the first mounting seat structure 21. The output end of the second drive motor 261 is connected to the grinding wheel 262, and the grinding wheel 262 is arranged in the protective cover structure 25. In this embodiment, the grinding wheel includes a grinding groove arranged along the circumferential direction, and the upper and lower edges of the glass are polished at the same time, and the polishing efficiency is high. The output shaft of the second drive motor 261 passes through the first mounting seat structure 21 and is connected to the grinding wheel 262, thereby driving the grinding wheel 262 to rotate. Since the grinding wheel 262 is arranged in the protective cover structure 25, even if the grinding wheel 262 falls off, the grinding wheel 262 will not fly out in the tangential direction, causing injuries to the staff.

[0041] like Figures 1 to 6As shown, in the technical solution of this embodiment, the second drive motor 261 structure includes a first shaft segment 2611 and a second shaft segment 2612, the first shaft segment 2611 is inserted into the bearing structure 27, the second shaft segment 2612 is connected to the first shaft segment 2611, and the second shaft segment 2612 is inserted into the grinding wheel structure 26. There is an interference fit between the first shaft segment 2611 and the bearing structure 27, and the inner ring 272 of the bearing structure 27 rotates with the first shaft segment 2611, and there is an interference fit between the second shaft segment 2612 and the grinding wheel 262, and the grinding wheel 262 rotates with the rotation of the second shaft segment 2612. The diameter relationship between the first shaft segment 2611 and the second shaft segment 2612 can be greater than, less than or equal to.

[0042] like Figures 1 to 4 As shown, in the technical solution of this embodiment, the grinding assembly 20 also includes a horizontal driving structure 28, and the first mounting seat structure 21 is connected to the horizontal driving structure 28. The horizontal driving structure 28 includes a slide rail and a slider, the slider is movably connected to the slide rail, and the slider is connected to the first mounting seat structure 21. The setting of the horizontal driving structure allows the first mounting seat structure 21 to move in the horizontal direction, thereby changing the position of the grinding wheel structure 26 on the horizontal plane. The grinding wheel structure 26 has a grinding state close to the bearing assembly 10 and a state to be ground away from the bearing assembly 10. The use of slide rails and sliders for transmission ensures smooth movement during the transmission process, is not prone to vibration, and has high equipment stability.

[0043] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the bearing assembly 10 includes a fixed structure 11, a third drive motor structure 12 and a second mounting seat structure 13, the fixed structure 11 is connected to the output end of the third drive motor structure 12, and the third drive motor structure 12 is connected to the second mounting seat structure 13. The third drive motor structure 12 drives the fixed structure 11 to rotate, thereby driving the glass to be polished to rotate. The third drive motor structure 12 is used in conjunction with the horizontal drive structure 28 to achieve polishing of each side of the glass. Before polishing, the program is designed according to the outer dimensions of the glass, and the first drive motor structure 22, the second drive motor 261, the third drive motor structure 12 and the horizontal drive structure 28 are controlled respectively. The second drive motor 261 drives the grinding wheel 262 to rotate to polish the edge of the glass. The horizontal drive structure 28 controls the grinding wheel 262 to move closer to or away from the glass. The third drive motor structure 12 drives the glass to rotate, so that different sides are polished toward the grinding wheel structure 26. The first drive motor structure 22 drives the protective cover structure 25 to rotate to avoid interference between the protective cover structure 25 and the glass, which plays an adjustment role.

[0044] like Figures 1 to 3As shown, in the technical solution of this embodiment, the fixed structure 11 includes a negative pressure groove 111, and the negative pressure groove 111 is arranged on the side of the fixed structure 11 away from the second mounting seat structure 13. The glass is placed on the fixed structure 11, and the glass is fixed by negative pressure adsorption, and the glass is not easy to move. The projection of the fixed structure 11 in the vertical direction is located within the projection of the glass in the vertical direction, so as to avoid the grinding wheel 262 from contacting the fixed structure 11 during the grinding process, resulting in damage to the fixed structure 11.

[0045] Based on the above, it can be known that the patented technology mainly consists of a linear module (horizontal drive structure 28), a support seat (first mounting seat structure 21), a follower driven gear (driven gear structure 24), a base (second mounting seat structure 13), a grinding head motor (second drive motor 261), a glass adsorption plate (fixed structure 11), a rotating motor seat, a rotating motor (third drive motor structure 12), a coupling, a grinding head cover (protective cover structure 25), a grinding wheel 262, a grinding wheel pressure cover, a grinding head cover following the motor (first drive motor structure 22), a follower drive gear (active gear 23), a bearing (bearing structure 27), a bearing seat, a bearing pressure cover, a rotating seat, etc. The linear module and the base are fixed on the frame. The support seat is installed on the slider of the linear module, and the grinding head motor and the grinding head cover follow the motor and the bearing seat are installed thereon. The bearing is set in the bearing seat and is pressed by the bearing pressure cover. The follower driven gear is fixed above the grinding head cover, and the grinding head cover is set on the bearing seat through the bearing. The following drive gear is installed on the output shaft of the grinding head cover following motor. The grinding wheel 262 is installed on the output shaft of the grinding head motor and is pressed by the grinding wheel pressure cover. The rotating motor is connected to the base through the rotating motor seat. The glass adsorption plate is fixed on the rotating shaft in the rotating seat. The coupling connects the rotating motor and the rotating shaft in the rotating seat. The core technical elements of the technology of this application are: the grinding head assembly completes the grinding and grinding feed functions; the glass rotating assembly completes the grinding position change function; the linear feed motion of the grinding head assembly and the rotational motion of the glass rotating assembly constitute the grinding motion; a notch is opened at the lower part of the grinding head cover, and the glass to be ground extends from it to contact the outer periphery of the grinding wheel 262; a number of spray water interfaces are opened above the notch of the grinding wheel 262, and the center line of the water spray hole below is just aligned with the circumferential grinding groove of the grinding wheel 262, and has a certain inclination angle with the horizontal plane. This inclination angle is as small as possible, as long as the notch leaves space without interfering with the glass to be ground; the function of the grinding head cover following motor is to follow The driving gear and the follower driven gear rotate the grinding head cover so that the notch of the grinding head cover is always parallel to the tangent line at the grinding point of the glass to be ground; the function of the linear module is to keep the grinding wheel 262 always close to the edge of the glass to be ground; the function of the rotary motor is to drive the glass to be ground to rotate so as to complete the grinding process around the entire glass to be ground; the function of the grinding head motor is to drive the grinding wheel 262 to rotate at high speed to complete the glass cutting work; the linear module is mainly composed of a servo motor, a linear guide rail, a ball screw, etc.; the linear module, the rotary motor, and the grinding head cover follower motor are controlled as a whole by the motion controller according to the edge geometry of the glass to be ground. At the beginning of the work, the linear module, the glass adsorption plate, the rotary motor, and the grinding head cover follower motor are all at the initial origin position. Subsequently, the glass to be ground is positioned at the previous station and then transferred to the glass adsorption plate by the robot, and then the vacuum adsorption tank is connected to the vacuum air source, and the glass to be ground is adsorbed and fixed on the glass adsorption plate. Start the grinding head motor and spray water supply, and the motion controller controls the linear module, rotary motor, and grinding head cover to follow the motor for grinding according to the pre-programmed program.When the glass adsorption plate drives the glass to be ground to rotate one circle, the grinding work is completed. The motion controller is used to control the movement of each mechanism, with stable and reliable performance and high production efficiency. It can be directly transferred from the previous process by the robot, eliminating the positioning link; the mechanical structure is simple and easy to use and maintain.

[0046] So far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the present application.

[0047] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A special-shaped glass edge grinding machine, characterized in that: include: A bearing assembly (10), on which the glass to be edge-polished is arranged; A grinding assembly (20), the grinding assembly (20) being arranged corresponding to the bearing assembly (10), the grinding assembly (20) comprising a first mounting seat structure (21), a first driving motor structure (22), a driving gear (23), a driven gear structure (24), a protective cover structure (25) and a grinding wheel structure (26), the first driving motor structure (22) being fixed on the first mounting seat structure (21), the driving gear (23) being connected to the output shaft of the first driving motor structure (22), the driven gear structure (24) being meshed with the driving gear (23), the grinding wheel structure (26) being partially arranged in the protective cover structure (25), and the protective cover structure (25) having an opening (251).

2. The special-shaped glass edge grinding machine according to claim 1, characterized in that: The driven gear structure (24) comprises a driven gear (241) and a connecting portion (242); the driven gear (241) is meshed with the driving gear (23); the connecting portion (242) is connected to the driven gear (241); and the connecting portion (242) is connected to the protective cover structure (25).

3. The special-shaped glass edge grinding machine according to claim 2, characterized in that: The grinding assembly (20) further comprises a bearing structure (27), wherein the bearing structure (27) is arranged in the connecting portion (242), and the bearing structure (27) is sleeved on the grinding wheel structure (26).

4. The special-shaped glass edge grinding machine according to claim 3, characterized in that: The bearing structure (27) includes an outer ring (271), an inner ring (272) and a ball (273), wherein the ball (273) includes a plurality of balls (273), and the plurality of balls (273) are rotatably arranged between the outer ring (271) and the inner ring (272), and the outer diameter of the outer ring (271) is greater than the inner diameter of the protective cover structure (25).

5. The special-shaped glass edge grinding machine according to claim 1, characterized in that: The angle between the two ends of the opening (251) and the line connecting the center of the protective cover structure (25) is greater than the maximum inner angle of the glass to be ground.

6. The special-shaped glass edge grinding machine according to claim 3, characterized in that: The grinding wheel structure (26) comprises a second drive motor (261) and a grinding wheel (262); the second drive motor (261) is connected to the first mounting seat structure (21); the output end of the second drive motor (261) structure is connected to the grinding wheel (262); and the grinding wheel (262) is arranged in the protective cover structure (25).

7. The special-shaped glass edge grinding machine according to claim 6, characterized in that: The second drive motor (261) structure comprises a first shaft section (2611) and a second shaft section (2612), wherein the first shaft section (2611) is inserted into the bearing structure (27), the second shaft section (2612) is connected to the first shaft section (2611), and the second shaft section (2612) is inserted into the grinding wheel structure (26).

8. The special-shaped glass edge grinding machine according to claim 1, characterized in that: The grinding assembly (20) further comprises a horizontal driving structure (28), and the first mounting seat structure (21) is connected to the horizontal driving structure (28).

9. The special-shaped glass edge grinding machine according to any one of claims 1 to 8, characterized in that: The bearing assembly (10) comprises a fixed structure (11), a third drive motor structure (12) and a second mounting seat structure (13); the fixed structure (11) is connected to an output end of the third drive motor structure (12), and the third drive motor structure (12) is connected to the second mounting seat structure (13).

10. The special-shaped glass edge grinding machine according to claim 9, characterized in that: The fixed structure (11) comprises a negative pressure groove (111), and the negative pressure groove (111) is arranged on a side of the fixed structure (11) away from the second mounting seat structure (13).

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