Milk powder box structure capable of being opened by vertically pressing key

Abstract

The utility model relates to a milk powder box structure capable of being opened by vertically pressing a key. The technical problem that an existing milk powder box is low in opening and closing efficiency is solved. Comprising a box body with an opening in the upper end, an upper cover body is arranged at the upper end of the box body, an opening is formed in the upper cover body, a dustproof cover capable of sealing the opening is movably arranged at the upper end of the upper cover body, one side of the dustproof cover is rotationally arranged on one side of the upper cover body through a cover body rotating structure, and a mounting groove is formed in the other side of the upper cover body; a mounting groove is formed in the dustproof cover, a swing arm body is arranged in the mounting groove through an elastic hinge connection structure, one side, close to the dustproof cover, of the swing arm body is provided with a clamping part which is clamped with a buckle body on the other side of the dustproof cover, a key is vertically and movably arranged in the mounting groove, and an unlocking structure is arranged between the key and the swing arm body. The dustproof cover has the advantages that the swing arm body can be rotationally arranged in the mounting groove through the hinge connecting assembly, and the swing arm body can be conveniently driven to rotate through the key and the unlocking structure, so that the swing arm body is separated from and unlocked from the dustproof cover, and a user can conveniently open the dustproof cover.

Description

Technical Field

[0001] This utility model belongs to the field of milk powder box technology, specifically relating to a milk powder box structure with a vertically press-button opening mechanism. Background Technology

[0002] Currently, most milk powder is stored in milk powder cans, which ensure a tight seal. However, once the can is opened, the seal is compromised, making the milk powder susceptible to moisture and affecting its preservation. To address this, a milk powder box has emerged, offering convenient storage and retrieval while maintaining a tight seal. However, the lids of these boxes, designed to ensure a tight seal, often have inefficient opening and closing mechanisms, impacting the user experience. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a milk powder box structure with a vertically press-button opening mechanism.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A milk powder box structure with a vertically press-button opening includes a box body with an opening at the top. The upper part of the box body is provided with an upper cover capable of closing the opening. The upper cover has an opening, and a dust cover is movably provided at the upper end of the upper cover to close the opening. One side of the dust cover is rotatably mounted on one side of the upper cover via a cover rotation structure. The other side of the upper cover has a mounting groove, and a swing arm is provided within the mounting groove via an elastic hinge connection structure. The side of the swing arm near the dust cover has a latching element that engages with the other side of the dust cover. The mounting groove of the mounting part has a vertically movable button, and there is an unlocking structure between the button and the swing arm body. When the button is subjected to external force and moves downward, the swing arm body can swing circumferentially, thereby disengaging the mounting part from the buckle body. The cover rotation structure can fix one side of the dust cover to the upper cover body and rotate it on the upper cover body, which facilitates the installation control of the dust cover. The buckle body and the mounting part can ensure the connection and sealing effect between the upper cover body and the dust cover. The unlocking structure allows the user to control the locking relationship between the buckle body and the mounting part, making it easy to unlock and open the dust cover.

[0005] In the above-mentioned structure of a milk powder box with a vertically press-button opening mechanism, the elastic hinge connection structure includes a hinge connection component and an elastic pressing component disposed between the swing arm body and the mounting groove. The hinge connection component allows the swing arm body to rotate and be disposed in the mounting groove, and the elastic pressing component ensures the locking effect between the locking part of the swing arm body and the buckle body, and facilitates quick unlocking by the unlocking structure.

[0006] In the above-mentioned structure of a milk powder box with a vertically press-button opening mechanism, the hinge connection assembly includes a hinge shaft located at the lower end of the swing arm body and near the dust cover. The bottom of the mounting groove has hinge seats on both sides that cooperate with the hinge shaft. The hinge shaft is rotatably disposed between the hinge seats. Through the hinge shaft and the hinge seats, the two sides of the swing arm body can be inserted and connected to the mounting groove, and the swing arm body can be moved and rotated within the mounting groove, which facilitates the control of the swing arm body and ensures the unlocking effect and the locking effect.

[0007] In the above-mentioned structure of a milk powder box with a vertically press-button opening mechanism, the elastic top-pressing component includes a spring mounting post located at the lower end of the swing arm body and away from the hinge axis. The spring mounting post is provided with a top-pressing spring that abuts against the bottom of the mounting groove. The spring mounting post ensures that the top-pressing spring abuts against the swing arm body. Under normal conditions, the top-pressing spring pushes the swing arm body upward to ensure the locking effect between the locking part and the buckle body. When the top-pressing spring is compressed, the locking part of the swing arm body and the buckle body lose their locking effect. When the top-pressing spring is decompressed, the top-pressing spring drives the swing arm body to automatically reset.

[0008] In the above-mentioned structure of a milk powder box with a vertically pressable button for opening the lid, the button is located on the side of the swing arm away from the dust cover. The button has extensions on both sides extending to both sides of the swing arm. The mounting groove has vertically arranged guide ribs on both sides, and the button has vertically arranged guide grooves on both sides corresponding to the guide ribs. The guide ribs and guide grooves are vertically slidably connected. A vertical movement limiting structure is provided between the mounting groove and the button. The guide ribs and guide grooves allow the button to be vertically and movably mounted within the mounting groove, and the vertical movement limiting structure restricts the button's lifting height, ensuring effective button control.

[0009] In the aforementioned structure of a milk powder box with a vertically pressable button for opening the lid, the vertically movable limiting structure includes a movable hole vertically disposed on the button. The mounting groove has a limiting part movably disposed within the movable hole on the side away from the swing arm body. The vertical height of the movable hole is greater than the vertical height of the limiting part. When the button moves up and down, the limiting part moves up and down relative to the movable hole, and the limiting part can limit the range of motion of the movable hole, ensuring that the button is not pressed too deeply, which could lead to problems such as malfunction and ensure the stability of the button.

[0010] In the aforementioned structure of a milk powder box with a vertically pressable button for opening the lid, the unlocking structure includes a swing arm receiving groove located on the side of the button near the swing arm body. The swing arm body is movably disposed within the swing arm receiving groove. The inside of the swing arm receiving groove has vertically arranged top pressing parts on both sides. On the side of the swing arm body away from the hinge axis, there is a swing force-bearing step that abuts against the top pressing part. The swing arm receiving groove facilitates the movable placement of the swing arm body. The top pressing part and the swing force-bearing step enable the top pressing part to apply pressure to the swing force-bearing step when the button is subjected to downward force, causing the swing arm body to swing, thereby disengaging the locking part from the buckle body and ensuring the button control effect.

[0011] In the above-mentioned structure of a milk powder box with a vertically press-button opening mechanism, the rotating structure of the lid includes a rotating groove on one side of the upper lid, a rotating part movably disposed in the rotating groove on one side of the dust cover, a rotating shaft extending to both sides of the rotating part, rotating holes corresponding to the rotating shaft on both sides of the rotating groove, and the rotating shaft extending into the rotating holes. The rotating groove facilitates the placement of the rotating part, and the rotating part is inserted into the rotating holes via the rotating shaft, so that the rotating part is rotatably disposed on the rotating groove, thereby causing the dust cover to rotate on the rotating groove.

[0012] In the above-mentioned structure of a milk powder box with a vertically press-button opening mechanism, a first sealing component is provided between the inner circumferential side of the box body and the outer circumferential side of the upper cover, and a second sealing component is provided between the upper cover and the dust cover. The first sealing component includes a first sealing groove provided on the outer circumferential side of the lower end of the upper cover and extending inward. A first sealing ring is provided in the first sealing groove. One side of the first sealing ring abuts against the box body. The first sealing groove facilitates the installation and placement of the first sealing ring, and the first sealing ring ensures a sealing effect between the outer circumferential side of the lower end of the upper cover and the inner circumferential side of the upper end of the box body.

[0013] In the above-mentioned structure of a milk powder box with a vertically press-button opening, the second sealing component includes a second sealing groove disposed on the outer circumference of the opening, a second sealing ring disposed on the second sealing groove, one side of the second sealing ring extending onto the upper cover, and a dustproof ring disposed inside the dustproof cover that abuts against the second sealing ring. The second sealing groove facilitates the placement of the second sealing ring, and the second sealing ring and the dustproof ring ensure a sealing effect on the opening, further improving the protection of the milk powder.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] 1. The elastic top pressing component can lock the dust cover into the swing arm body under normal conditions, ensuring the dust cover's dustproof effect.

[0016] 2. The hinged connection assembly allows the swing arm to rotate within the mounting groove, and the button and unlocking mechanism facilitate the rotation of the swing arm, allowing the dust cover to disengage and be unlocked, making it easy for the user to open the dust cover.

[0017] 3. The vertical movable limiting structure can limit the button, allowing the button to move vertically up and down within the mounting groove, and limiting the height of the button's movement to ensure the button's control effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a structural cross-sectional view of the present invention.

[0020] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle.

[0021] Figure 4 This is an exploded view of the structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the elastic hinge connection structure in this utility model.

[0023] Figure 6 This is a schematic diagram of the rotating cover structure in this utility model.

[0024] In the diagram: 1. Box body; 11. Opening; 2. Top cover; 21. Opening; 22. Mounting groove; 221. Guide rib; 3. Dust cover; 3. Snap-on body; 4. Cover rotating structure; 41. Rotating groove; 42. Rotating part; 43. Rotating shaft; 44. Rotating hole; 5. Elastic hinge connection structure; 51. Hinge connection assembly; 511. Hinge shaft; 512. Hinge seat; 52. Elastic top pressure assembly; 52. Spring mounting post; 521. Top pressure spring; 522. Swing arm body; 6. Snap-on part; 61. Button; 7. Extension part; 71. Guide groove; 72. Unlocking structure; 8. Swing arm receiving groove; 81. Top pressure part; 82. Swing force-bearing step; 83. Vertical movement limiting structure; 9. Movement hole; 91. Limiting part; 92. First sealing assembly; 10. Second sealing assembly; 100. First sealing groove; 101. First sealing ring; 102. Second sealing groove; 1001. Second sealing ring; 1002. Dust cover; 1003. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 5As shown, this is a milk powder box structure with a vertically press-button opening. It includes a box body 1 with an opening 11 at the top, allowing milk powder to be easily placed inside. The box body 1 has an upper cover 2 that can close the opening 11. The upper cover 2 has an opening 21, and a dust cover 3 is movably mounted on its upper end to close the opening 21. The upper cover 2 and dust cover 3 facilitate dustproof sealing of the milk powder inside the box body 1, ensuring its protective effect. One side of the dust cover 3 is rotatably mounted on one side of the upper cover 2 via a cover rotation structure 4. The other side of the upper cover 2 has a mounting groove 22. A swing arm 6 is provided within the mounting groove 22 via an elastic hinge connection structure 5. The side of the swing arm 6 closest to the dust cover 3 has a connection with the dust cover 3. On the other side, the latching parts 61 of the latching bodies 31 are interlocked. A button 7 is vertically movable in the mounting groove 22. There is an unlocking structure 8 between the button 7 and the swing arm 6. When the button 7 is subjected to external force and moves downward, the swing arm 6 can swing circumferentially, thereby disengaging the latching part 61 from the latching body 31. The cover rotation structure 4 can fix one side of the dust cover 3 to the upper cover 2 and rotate it on the upper cover 2, which is convenient for the installation and control of the dust cover 3. The latching body 31 and the latching part 61 can ensure the connection and sealing effect between the upper cover 2 and the dust cover 3. The unlocking structure 8 can make it easy for the user to control the locking relationship between the latching body 31 and the latching part 61, and to unlock and open the dust cover 3.

[0027] Specifically, the elastic hinge connection structure 5 includes a hinge connection component 51 and an elastic pressing component 52 disposed between the swing arm body 6 and the mounting groove 22. The hinge connection component 51 enables the swing arm body 6 to be rotatably disposed in the mounting groove 22, and the elastic pressing component 52 ensures the snapping effect between the snapping part 61 of the swing arm body 6 and the snapping body 31 and facilitates the quick unlocking of the unlocking structure 8.

[0028] The hinge connection assembly 51 includes a hinge shaft 511 located at the lower end of the swing arm body 6 and near the dust cover 3. The bottom of the mounting groove 22 has hinge seats 512 on both sides that cooperate with the hinge shaft 511. The hinge shaft 511 is rotatably disposed between the hinge seats 512. The hinge shaft 511 and the hinge seats 512 enable the two sides of the swing arm body 6 to be inserted and connected to the mounting groove 22, and enable the swing arm body 6 to move and rotate within the mounting groove 22, which facilitates the control of the swing arm body 6 and ensures the unlocking effect and the locking effect.

[0029] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the elastic pressing assembly 52 includes a spring mounting post 521 located at the lower end of the swing arm body 6 and away from the hinge shaft 511. The spring mounting post 521 is provided with a pressing spring 522 that abuts against the bottom of the mounting groove 22. The spring mounting post 521 ensures that the pressing spring 522 abuts against the swing arm body 6. Under normal conditions, the pressing spring 522 pushes the swing arm body 6 upward to ensure the locking effect between the locking part 61 and the buckle body 31. When the pressing spring 522 is compressed, the locking part 61 of the swing arm body 6 and the buckle body 31 lose their locking effect. When the pressing spring 522 is decompressed, it drives the swing arm body 6 to automatically reset.

[0030] Furthermore, button 7 is located on the side of the swing arm 6 away from the dust cover 3. Both sides of button 7 have extensions 71 extending to both sides of the swing arm 6. The extensions 71 can limit the movement of the swing arm 6, ensuring that the swing arm 6 is movably positioned between the extensions 71. Both sides of the mounting groove 22 have vertically arranged guide ribs 221. Both sides of button 7 have vertically arranged guide grooves 72 corresponding to the guide ribs 221. The guide ribs 221 and guide grooves 72 are vertically slidably connected. A vertical movement limiting structure 9 is provided between the mounting groove 22 and button 7. The guide ribs 221 and guide grooves 72 can allow button 7 to be vertically movably positioned within the mounting groove 22. The vertical movement limiting structure 9 can limit the lifting height of button 7, ensuring the control effect of button 7.

[0031] The vertical movable limiting structure 9 includes a movable hole 91 vertically disposed on the button 7. The mounting groove 22 has a limiting part 92 movably disposed within the movable hole 91 on the side away from the swing arm body 6. The height of the movable hole 91 in the vertical direction is greater than the height of the limiting part 92 in the vertical direction. When the button 7 moves up and down, the limiting part 92 moves up and down relative to the movable hole 91 within the movable hole 91. The limiting part 92 can limit the range of motion of the movable hole 91, ensuring that the button 7 is not pressed too deeply, which could lead to problems such as malfunction and ensure the stability of the button 7.

[0032] Combination Figure 2 , Figure 4 , Figure 5 , Figure 6As shown, the unlocking structure 8 includes a swing arm receiving groove 81 located on the side of the button 7 near the swing arm body 6. The swing arm body 6 is movably disposed in the swing arm receiving groove 81. The swing arm receiving groove 81 has vertically arranged pressing parts 82 on both sides. On the side of the swing arm body 6 away from the hinge axis 511, there are swing force-bearing steps 83 that abut against the pressing parts 82. The swing arm receiving groove 81 facilitates the movable placement of the swing arm body 6. The pressing parts 82 and the swing force-bearing steps 83 enable the button 7 to be displaced downward under force, so that when the button 7 is displaced downward, the pressing parts 82 apply pressure to the swing force-bearing steps 83, causing the swing arm body 6 to swing, thereby disengaging the locking part 61 from the buckle body 31 and ensuring the control effect of the button 7.

[0033] The cover rotation structure 4 includes a rotation groove 41 on one side of the upper cover 2, and a rotation part 42 movably disposed in the rotation groove 41 on one side of the dust cover 3. The rotation part 42 extends to both sides with a rotation shaft 43. Rotation holes 44 corresponding to the rotation shaft 43 are provided on both sides of the rotation groove 41. The rotation shaft 43 extends into the rotation holes 44. The rotation groove 41 facilitates the placement of the rotation part 42, and the rotation part 42 is inserted into the rotation hole 44 through the rotation shaft 43, so that the rotation part 42 is rotatably disposed on the rotation groove 41, thereby allowing the dust cover 3 to rotate on the rotation groove 41.

[0034] Specifically, a first sealing component 10 is provided between the inner side of the box body 1 and the outer side of the upper cover 2, and a second sealing component 100 is provided between the upper cover 2 and the dust cover 3. The first sealing component 10 includes a first sealing groove 101 provided on the outer side of the lower end of the upper cover 2 and extending inward. A first sealing ring 102 is provided in the first sealing groove 101. One side of the first sealing ring 102 abuts against the box body 1. The first sealing groove 101 facilitates the installation and placement of the first sealing ring 102, and the first sealing ring 102 ensures the sealing effect between the outer side of the lower end of the upper cover 2 and the inner side of the upper end of the box body 1.

[0035] Combination Figure 3 , Figure 5 , Figure 6 As shown, the second sealing assembly 100 includes a second sealing groove 1001 disposed on the outer periphery of the opening 21, a second sealing ring 1002 disposed on the second sealing groove 1001, one side of the second sealing ring 1002 extending onto the upper cover 2, and a dustproof ring 1003 disposed inside the dustproof cover 3 abutting against the second sealing ring 1002. The second sealing groove 1001 facilitates the placement of the second sealing ring 1002, and the second sealing ring 1002 and the dustproof ring 1003 ensure the sealing effect on the opening 21, further improving the protection effect on the milk powder.

[0036] The principle of this embodiment is as follows: the milk powder inside the box 1 is sealed and protected by the upper cover 2 and the dust cover 3. The dust cover 3 can be rotatably mounted on the upper cover 2 through the cover rotation structure 4. The upper cover 2 can be locked with the buckle body 31 of the dust cover 3 through the swing arm body 6 to ensure the locking and sealing effect. The upper cover 2 is provided with an elastic hinge connection structure 5 that can control the movement of the swing arm body 6. The elastic hinge connection structure 5 can be controlled by the button 7 to control the locking part 61 of the swing arm body 6, so that the locking part 61 is disengaged from the buckle body 31, which makes it convenient for the user to control the opening and closing of the dust cover 3. The first sealing component 10 and the second sealing component 100 can further ensure the sealing effect inside the box 1.

[0037] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0038] Although this article uses a lot of terms such as box body 1, opening 11, upper cover 2, vent 21, mounting groove 22, guide rib 221, dust cover 3, snap fastener 31, cover rotation structure 4, rotation groove 41, rotation part 42, rotation shaft 43, rotation hole 44, elastic hinge connection structure 5, hinge connection assembly 51, hinge shaft 511, hinge seat 512, elastic top pressure assembly 52, spring mounting post 521, top pressure spring 522, swing arm body 6, snap fastener 61. Button; 7. Extension; 71. Guide groove; 72. Unlocking structure; 8. Swing arm receiving groove; 81. Top pressing part; 82. Swinging force-bearing step; 83. Vertical movement limiting structure; 9. Movable hole; 91. Limiting part; 92. First sealing assembly; 10. Second sealing assembly; 100. First sealing groove; 101. First sealing ring; 102. Second sealing groove; 1001. Second sealing ring; 1002. Dustproof ring; 1003, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A milk powder box structure with a vertically press-button opening, comprising a box body (1) with an opening (11) at the top, wherein the box body (1) is provided with an upper cover (2) capable of closing the opening (11), the upper cover (2) having an opening (21) and a dust cover (3) movably provided at the upper end of the upper cover (2) capable of closing the opening (21), characterized in that, The dust cover (3) is rotatably mounted on one side of the upper cover (2) via the cover rotation structure (4). The other side of the upper cover (2) has an installation groove (22). A swing arm (6) is provided in the installation groove (22) via an elastic hinge connection structure (5). The side of the swing arm (6) near the dust cover (3) has a locking part (61) that locks into the buckle body (31) on the other side of the dust cover (3). A button (7) is vertically movable in the installation groove (22). An unlocking structure (8) is provided between the button (7) and the swing arm (6) so that the swing arm (6) can swing circumferentially when the button (7) is subjected to external force and moves downward, thereby disengaging the locking part (61) from the buckle body (31).

2. The milk powder box structure with a vertically press-button opening mechanism according to claim 1, characterized in that, The elastic hinge connection structure (5) includes a hinge connection assembly (51) and an elastic pressing assembly (52) disposed between the swing arm body (6) and the mounting groove (22).

3. The milk powder box structure with a vertically press-button opening mechanism according to claim 2, characterized in that, The hinge connection assembly (51) includes a hinge shaft (511) disposed at the lower end of the swing arm body (6) and on the side near the dust cover (3). The bottom sides of the mounting groove (22) are respectively provided with hinge seats (512) that cooperate with the hinge shaft (511), and the hinge shaft (511) is rotatably disposed between the hinge seats (512).

4. The milk powder box structure with a vertically press-button opening mechanism according to claim 3, characterized in that, The elastic top pressure assembly (52) includes a spring mounting post (521) disposed at the lower end of the swing arm body (6) and on the side away from the hinge axis (511), and the spring mounting post (521) is provided with a top pressure spring (522) that abuts against the bottom of the mounting groove (22).

5. A milk powder box structure with a vertically press-button opening mechanism according to claim 3 or 4, characterized in that, The button (7) is located on the side of the swing arm (6) away from the dust cover (3). The button (7) has extensions (71) extending to both sides of the swing arm (6). The mounting groove (22) has vertically arranged guide ribs (221) on both sides. The button (7) has vertically arranged guide grooves (72) on both sides corresponding to the guide ribs (221). The guide ribs (221) and guide grooves (72) are vertically slidably connected. A vertically movable limiting structure (9) is provided between the mounting groove (22) and the button (7).

6. The milk powder box structure with a vertically press-button opening mechanism according to claim 5, characterized in that, The vertical movable limiting structure (9) includes a movable hole (91) vertically disposed on the button (7), and the mounting groove (22) has a limiting part (92) movably disposed in the movable hole (91) on the side away from the swing arm body (6), and the height of the movable hole (91) in the vertical direction is greater than the height of the limiting part (92) in the vertical direction.

7. The milk powder box structure with a vertically press-button opening mechanism according to claim 6, characterized in that, The unlocking structure (8) includes a swing arm receiving groove (81) disposed on the side of the button (7) near the swing arm body (6). The swing arm body (6) is movably disposed in the swing arm receiving groove (81). The swing arm receiving groove (81) has vertically arranged top pressing parts (82) on both sides inside. On the side of the swing arm body (6) away from the hinge axis (511), there are swing force-bearing steps (83) that abut against the top pressing parts (82).

8. The milk powder box structure with a vertically press-button opening mechanism according to claim 1, characterized in that, The cover rotation structure (4) includes a rotation groove (41) on one side of the upper cover (2), and a rotation part (42) movably disposed in the rotation groove (41) on one side of the dust cover (3). The rotation part (42) extends to both sides and is provided with a rotation shaft (43). The rotation groove (41) is provided with rotation holes (44) on both sides corresponding to the rotation shaft (43). The rotation shaft (43) extends into the rotation hole (44).

9. The milk powder box structure with a vertically press-button opening mechanism according to claim 1, characterized in that, A first sealing assembly (10) is provided between the inner circumferential side of the box body (1) and the outer circumferential side of the upper cover body (2). A second sealing assembly (100) is provided between the upper cover body (2) and the dust cover (3). The first sealing assembly (10) includes a first sealing groove (101) provided on the lower outer circumferential side of the upper cover body (2) and extending inward. A first sealing ring (102) is provided in the first sealing groove (101). One side of the first sealing ring (102) abuts against the box body (1).

10. A milk powder box structure with a vertically press-button opening mechanism according to claim 9, characterized in that, The second sealing assembly (100) includes a second sealing groove (1001) disposed on the outer side of the opening (21), a second sealing ring (1002) is provided on the second sealing groove (1001), one side of the second sealing ring (1002) extends and is disposed on the upper cover (2), and a dustproof ring (1003) is provided inside the dustproof cover (3) that abuts against the second sealing ring (1002).

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