Modular stand for juicer, modular base and base modular juicer

By using a modular bracket and base design, the core components of the juicer are integrated into the inner bracket and fixed with a sealed structure and screws. This solves the problems of complex assembly and difficult maintenance of the juicer, improves the structural integration and safety of the juicer, and is suitable for portable juicing equipment.

CN224344772UActive Publication Date: 2026-06-12SHENZHEN PANACON TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN PANACON TECH CO LTD
Filing Date
2025-05-23
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing juicers suffer from low modularity, complex assembly, difficult maintenance, and insufficient safety in their structural design, which affects user experience and production efficiency.

Method used

The modular bracket and base design integrates the motor, motherboard, and battery onto the inner bracket. Combined with a sealed structure and screw fixing method, it enables overall disassembly and assembly, facilitating replacement and maintenance, and improving structural integration and sealing performance.

Benefits of technology

It significantly improves the ease of assembly, product versatility, and safety of use of juicers, reduces maintenance difficulty, meets aesthetic requirements, and is suitable for portable juicing equipment.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224344772U_ABST
    Figure CN224344772U_ABST
Patent Text Reader

Abstract

The utility model relates to juicer technical field especially relates to a modular support for juicer, modular base and base modular juicer. A kind of modular support for juicer, it include: inner support;And motor, mainboard and battery installed on inner support, battery is used to provide power supply for motor and mainboard. The utility model realizes the innovation of the assembly mode of juicer by the introduction of modular structure, significantly improves the maintainability, versatility and safety of product, and has good popularization value in portable juicing equipment field.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model relates to the field of juicer technology, and in particular to a modular support, modular base, and modular juicer for a juicer. Background Technology

[0002] With increasing attention to healthy eating, portable juicers have become widely popular due to their portability and ease of use. However, existing juicers still have some structural design flaws that affect user experience and product maintenance efficiency.

[0003] For example, Chinese utility model patent CN208551051U, entitled "Juicing Head and Juicer," discloses an improved juicing head structure. By setting up a combination of a stirring paddle and a filter screen, it improves juicing efficiency and reduces filter screen clogging. However, this patent mainly focuses on the combination structure of the juicing head and the filter screen and does not involve the modular design of the internal electrical components of the juicer.

[0004] Furthermore, Chinese invention patent application CN108784277A, entitled "Juicing Component and Juicing Equipment for Juicing Equipment," proposes a juicing component structure that is easy to clean, simplifying the disassembly process of the filter. Although this design improves cleaning and maintenance, it still does not solve the problems of low integration and complex assembly of core components such as the motor, motherboard, and battery inside the juicer.

[0005] In summary, while existing juicers have made some progress in improving juicing efficiency and ease of cleaning, they still have shortcomings in the modular and standardized design of their internal structure, resulting in cumbersome assembly and maintenance processes, which affect product production efficiency and user experience. Utility Model Content

[0006] The purpose of this utility model is to provide a modular bracket, modular base, and modular juicer for a juicer, addressing the shortcomings of existing technologies. By introducing a modular structure, it aims to innovate the assembly method of the juicer, significantly improving the maintainability, versatility, and safety of the product, and has good promotional value in the field of portable juicing equipment.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: a modular support for a juicer, comprising:

[0008] Internal stents; and

[0009] The motor, motherboard, and battery are mounted on the inner bracket, with the battery providing power to the motor and motherboard.

[0010] This solution sets up a modular bracket inside the juicer's base, with the motor, motherboard, and battery all integrated and installed on the inner bracket, forming an integrated modular inner bracket. This makes it easy to assemble and easy to change to different shell models, base models, etc. All that is needed is to transfer the integrated modular inner bracket to the new assembly body.

[0011] Furthermore, the motor has a motor shaft, and a sealing plug is installed on the motor shaft.

[0012] Furthermore, the inner support is provided with two battery slots; there are two batteries, and each battery is installed in one of the two battery slots.

[0013] Both the motor and the motherboard are secured to the inner bracket with screws.

[0014] A modular base for a juicer, comprising the modular support frame for a juicer as described in any one of the preceding claims, and further comprising:

[0015] The base is hollow inside, open at the bottom, and equipped with a motor-driven stirring blade at the top; and

[0016] Motor pressing parts;

[0017] The internal support is located inside the base body.

[0018] Furthermore, the motor shaft is connected to the stirring blade;

[0019] The stirring blade is a six-blade steel blade;

[0020] The motor clamping component rests against the bottom of the motor, and is locked to the bottom of the base body by screws.

[0021] Furthermore, the base also includes:

[0022] The bottom cover is sealed and installed at the bottom of the base body;

[0023] A waterproof ring is placed between the bottom cover and the bottom of the base body to seal the bottom cover.

[0024] Furthermore, the bottom cover is provided with countersunk holes, and the bottom cover is threaded to the bottom of the base body by screws passing through the countersunk holes;

[0025] The bottom cover is also equipped with a bottom cover plug that seals the countersunk hole;

[0026] The base is also equipped with a switch device controlled by the mainboard and used to start and stop the motor.

[0027] A modular juicer base, comprising the modular base for juicers as described in any one of the foregoing claims, and further comprising:

[0028] Cup lid;

[0029] A double-mouthed cup with an open top and bottom. The top of the double-mouthed cup is sealed by a threaded connection of the lid, and the bottom of the double-mouthed cup is sealed by a threaded connection of the top of the base.

[0030] Furthermore, the juicer also includes a waterproof ring for sealing the top of the double-mouthed cup and a waterproof ring for sealing the bottom of the double-mouthed cup.

[0031] Furthermore, the bottom of the cover is provided with a decorative frame.

[0032] Through the above technical solutions, this utility model can realize the modularization, standardization and sealing optimization of the juicer structure, and greatly improve the ease of assembly, product reusability and safety of use.

[0033] The beneficial effects of this utility model are:

[0034] 1. Improve structural integration and standardization.

[0035] Through a structural design that integrates an internal support frame with the motor, motherboard, and battery, multiple core components are grouped into a unified module. This module can be installed or disassembled as a whole, and is suitable for different models of juicer bases and juicers. Only the base shell needs to be replaced, eliminating the need for repeated disassembly and reassembly of the electrical components. The modular support frame for the juicer can still be reused, eliminating the need for repeated production and reassembly of different specifications of motors, motherboards, and batteries. This significantly improves product standardization and versatility, and enhances factory assembly efficiency. The double-mouth cup and lid can also be directly replaced while retaining the entire modular base, demonstrating strong adaptability and versatility.

[0036] 2. Reduce maintenance difficulty and improve replaceability

[0037] The motor shaft and mixing blade are securely connected via a clamping mechanism and screws, allowing for quick assembly and disassembly and facilitating future maintenance. Users or maintenance personnel can replace the entire module instead of individual components, significantly reducing maintenance complexity.

[0038] 3. Enhanced sealing performance to ensure safe use.

[0039] By incorporating a motor shaft sealing plug, a bottom cover waterproof ring, and a bottom cover plug, the overall waterproof sealing performance of the machine is further enhanced. This effectively isolates the liquid from contact with electrical components, preventing electrical short circuits caused by liquid leakage and improving operational safety.

[0040] 4. Combining aesthetics and practicality

[0041] By introducing decorative elements to the mid-frame, the aesthetic appeal is enhanced without compromising functionality, thus meeting the market's demand for aesthetically pleasing and portable products.

[0042] 5. Easy to drink and clean, enhancing the user experience.

[0043] Featuring a double-mouth cup design, with a screw-on cap at the top and a threaded connection between the bottom and base, it offers convenient drinking and disassembly. It is particularly suitable for mobile use, such as during outdoor activities or commutes.

[0044] In summary, this utility model, through the introduction of a modular structure, achieves innovation in the assembly method of juicers, significantly improving the maintainability, versatility, and safety of the product, and has good promotional value in the field of portable juicing equipment. Attached Figure Description

[0045] Figure 1 This is an exploded view of the structure of this utility model.

[0046] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0047] The reference numerals in the figures include:

[0048] 1-Cup lid, 2-Cup lid waterproof ring, 3-Double-mouth cup, 4-Six-blade steel knife, 5-Base waterproof ring,

[0049] 6-Base body, 7-Switch device, 8-Motor shaft rubber plug, 10-Inner bracket, 12-Motor, 13-Battery, 14-Main board, 16-Motor pressing part, 18-Middle frame decorative part, 19-Bottom cover waterproof ring, 20-Bottom cover, 22-Bottom cover plug. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection method.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. The terminology used in this specification of this utility model is only for the purpose of describing specific embodiments and is not intended to limit this utility model.

[0052] like Figures 1-2 As shown, a modular support for a juicer includes:

[0053] Internal stent 10; and

[0054] The motor 12, mainboard 14, and battery 13 are mounted on the inner bracket 10. The battery 13 provides power to the motor 12 and mainboard 14. This structure integrates the core drive and control components of the juicer onto a standardized inner bracket 10, forming a modular assembly that improves the standardization and versatility of the product structure, and significantly reduces assembly complexity and manufacturing costs.

[0055] In this design, the juicer's base is configured as a modular support, and the motor 12, mainboard 14, and battery 13 are all integrated and installed on the inner support 10, forming an integrated modular inner support 10. This makes it easy to assemble and easy to change to different shell models, appearances, base models, etc. It is only necessary to transfer the integrated modular inner support 10 to the new assembly body.

[0056] Furthermore, the motor 12 has a motor shaft with a sealing plug installed on it. By setting the sealing plug on the motor shaft, liquid is effectively prevented from seeping into the motor 12 along the gaps in the motor shaft, improving the waterproof sealing of the electrical components, thereby enhancing the safety of the juicer and its product lifespan.

[0057] Furthermore, the inner support 10 is provided with two battery slots 13; there are two batteries 13, and they are installed in the two battery slots 13 respectively.

[0058] Both the motor 12 and the main board 14 are secured to the inner bracket 10 with screws. By pre-setting battery slots 13 on the inner bracket 10 and installing the batteries 13 one-to-one, not only is wiring and installation convenient and the stability of the electrical system improved, but the screws also enhance the overall seismic performance and structural stability by securing the main board 14 and the motor 12.

[0059] A modular base for a juicer, comprising the modular support frame for a juicer as described in any one of the preceding claims, and further comprising:

[0060] The base body 6 is hollow inside, open at the bottom, and equipped with a stirring blade driven by a motor 12 at the top; and

[0061] Motor pressing component 16;

[0062] The inner support 10 is located inside the base body 6. The modular support is embedded into the base body 6 as a whole, and is mechanically limited and fixed by the motor clamping component 16, which improves the stability of the whole machine assembly, and at the same time realizes the disassembly, replacement and universal installation of the internal structure, which facilitates maintenance and product upgrades.

[0063] Furthermore, the motor shaft is connected to the stirring blade;

[0064] The stirring blade is a six-blade steel blade.

[0065] The motor clamping component 16 rests against the bottom of the motor 12 and is locked to the bottom of the base body 6 by screws. The stirring blade is directly driven by the motor shaft, and the use of a six-blade steel blade 4 structure effectively improves the food crushing ability; the motor clamping component 16 stably presses the motor 12 to the bottom to avoid vibration and displacement, ensuring stirring efficiency and structural safety.

[0066] Furthermore, the base also includes:

[0067] The bottom cover 20 is sealed and installed at the bottom of the base body 6;

[0068] A bottom cover waterproof ring 19 is located between the bottom cover 20 and the bottom of the base body 6 to seal the bottom cover 20. The bottom cover 20 works in conjunction with the bottom waterproof ring to achieve a good seal at the bottom of the machine base, preventing liquid from flowing back into the bottom electrical parts during juicing, and improving the overall waterproof capability and reliability of the machine.

[0069] Furthermore, the bottom cover 20 is provided with a countersunk hole, and the bottom cover 20 is threaded to the bottom of the base body 6 by passing a screw through the countersunk hole;

[0070] The bottom cover 20 is also provided with a bottom cover plug 22 that seals the countersunk hole;

[0071] The base body 6 is also equipped with a switch device 7 controlled by the main board 14 and used to start and stop the motor 12. The countersunk hole and screw structure improves the fixing strength between the bottom cover 20 and the base body 6, while the bottom cover plug 22 seals the screw hole to further improve the overall sealing performance; the switch device 7 on the base body 6 improves the ease of operation and the user-friendliness of human-machine interaction.

[0072] A modular juicer base, comprising the modular base for juicers as described in any one of the foregoing claims, and further comprising:

[0073] Cup lid 1;

[0074] The double-mouthed cup 3 has an open top and bottom. The top of the double-mouthed cup 3 is sealed by a threaded connection to the lid 1, and the bottom of the double-mouthed cup 3 is sealed by a threaded connection to the top of the base body 6. The double-mouthed cup 3 design allows the juicer to be unscrewed for direct drinking or disassembled for cleaning. The threaded connection ensures a secure assembly and allows users to quickly open or replace parts, improving ease of use and user experience.

[0075] Furthermore, the juicer also includes a waterproof ring 2 for sealing the top of the double-mouthed cup 3 and a waterproof ring 5 for sealing the bottom of the double-mouthed cup 3. By providing waterproof rings at the connection between the cup lid 1 and the base, the liquid sealing performance of the entire juicer is further improved, preventing internal electrical short circuits or beverage contamination caused by water leakage, thus enhancing product safety and durability.

[0076] Furthermore, the bottom of the bottom cover 20 is provided with a middle frame decorative piece 18. The middle frame decorative piece 18 not only beautifies the appearance of the juicer and enhances the overall design and market competitiveness of the product, but also plays a protective or cushioning role, reducing structural damage caused by drops.

[0077] Through the above technical solutions, this utility model can realize the modularization, standardization and sealing optimization of the juicer structure, and greatly improve the ease of assembly, product reusability and safety of use.

[0078] The beneficial effects of this utility model are:

[0079] 1. Improve structural integration and standardization.

[0080] Through a structural design of "internal support 10 + integrated installation of motor 12, mainboard 14, and battery 13", multiple core components are integrated into a unified module. This module can be installed or disassembled as a whole, and is suitable for different models of juicer bases and juicers. Only the base shell (base body 6) needs to be replaced, without repeated disassembly and reassembly of the electrical parts. The modular support for the juicer can still be reused, eliminating the need for repeated production and reassembly of different specifications of motor 12, mainboard 14, and battery 13. This significantly improves product standardization and versatility, and enhances factory assembly efficiency. The double-mouth cup 3 and cup lid 1 can also be directly replaced, while retaining the entire modular base, demonstrating strong adaptability and versatility.

[0081] 2. Reduce maintenance difficulty and improve replaceability

[0082] The motor shaft and mixing blade are secured with screws via the motor clamp 16, ensuring a more stable connection and allowing for quick disassembly and assembly for easy maintenance. Users or maintenance personnel can replace the entire module instead of individual components, significantly reducing maintenance complexity.

[0083] 3. Enhanced sealing performance to ensure safe use.

[0084] By incorporating a motor shaft sealing plug, a bottom cover waterproof ring 19, and a bottom cover plug 22, the overall waterproof sealing performance of the machine is further enhanced, effectively isolating the liquid from contact with electrical components, preventing electrical short circuits caused by liquid leakage, and improving safety during use.

[0085] 4. Combining aesthetics and practicality

[0086] The introduction of the mid-frame decorative component 18 enhances the aesthetic design without compromising functionality, thus meeting the market's demand for beautiful and portable products.

[0087] 5. Easy to drink and clean, enhancing the user experience.

[0088] Featuring a double-mouth, three-part structure, with a screw-on cap at the top and a six-part threaded connection between the bottom and base, it offers convenient drinking and disassembly. It is particularly suitable for mobile use, such as during outdoor activities or commutes.

[0089] In summary, this utility model, through the introduction of a modular structure, achieves innovation in the assembly method of juicers, significantly improving the maintainability, versatility, and safety of the product, and has good promotional value in the field of portable juicing equipment.

[0090] In detail:

[0091] Modular support for juicers: Includes a one-piece molded inner support 10, with pre-set mounting positions for the motor 12, mainboard 14, and two batteries 13. The two batteries 13 are respectively embedded in battery slots on both sides of the support. The mainboard 14 is fixed to the central circuit slot with three screws. The motor 12 is secured to the lower center of the support with two screws. A sealing plug is fitted onto the output shaft of the motor 12 to prevent liquid from seeping into the motor 12.

[0092] Modular base structure: The base body 6 is a hollow shell with an opening at the bottom for assembling modular brackets. After the inner bracket 10 is embedded inside the base body 6, a metal motor clamp 16 presses the motor 12 upwards from below, and two screws secure the motor clamp 16 to the bottom of the base, thus stabilizing the entire module. The motor shaft passes through the central hole at the top of the base body 6 and is mechanically connected to a six-bladed steel stirring blade.

[0093] Sealing structure design: A bottom cover 20 is encapsulated at the bottom of the base body 6. The bottom cover 20 is locked onto the base body 6 by screws passing through countersunk holes, and a waterproof ring is provided to ensure a bottom seal. At the same time, a bottom cover plug 22 is provided in the screw hole to seal the screw hole and improve the waterproof rating. The whole machine's power switch function is triggered by a button located on the outside of the base body 6. The button signal is transmitted to the main board 14 through wires to control the start and stop of the motor 12.

[0094] Juicing cup structure: The top and bottom of the double-mouthed cup 3 are both threaded. The top is sealed by rotating the cup lid 1, and the bottom is threadedly connected to the top of the base body 6 to form a complete closed structure. The cup lid 1 and the base are both equipped with corresponding waterproof rings to improve the liquid sealing ability.

[0095] Appearance and Structure: To enhance the product’s aesthetics and grip, a decorative frame 18 is provided on the outside of the bottom cover 20. Its color, material and texture can be customized according to market demand.

[0096] During use, the user only needs to press the power button. The mainboard 14 controls the motor 12 to start and drive the six-blade steel blade 4 to rotate at high speed, quickly pulverizing fruits and vegetables. After juicing, simply unscrew the top lid 1 to drink directly. If a different model of the machine base is needed, simply remove the modular support and install it into the new housing, greatly improving product versatility and replacement efficiency.

[0097] This utility model also discloses a modular juicer with a base, comprising: a double-mouthed cup 3, a base body 6, and a cup lid 1. The base body 6 is installed at the bottom of the double-mouthed cup 3. A drive device, consisting of a motor 12, two batteries 13, a main board 14, etc., is installed inside the base body 6 and mounted on an inner bracket 10. The motor 12 is secured to the inner bracket 10 by two screws 9. The two batteries 13 are placed in the battery slots of the inner bracket 10. A rubber plug 8 is installed on the drive shaft of the motor 12 to provide a seal.

[0098] The base 6 has a six-bladed steel blade 4 driven by a drive unit on its top. A switch 7 is also installed inside the base 6 to control the opening and closing of the drive unit (i.e., motor 12). The switch 7 is controlled by a main board 14, which is fixed to the inner bracket 10 by three screws. After assembly, the inner bracket 10 is fixed to the base 6 by screws 11 and locked in place with the motor clamping component 16 and screws 17.

[0099] The bottom cover 20 is installed at the bottom of the base body 6 by screws 21. The middle frame decorative piece 18 serves only an aesthetic purpose, while the bottom cover waterproof ring 19 and the bottom cover plug 22 serve a sealing purpose.

[0100] The lid 1 is installed on top of the double-mouthed cup 3, and the waterproof ring 2 on the lid seals the lid 1 and the double-mouthed cup 3. After unscrewing the threads on the double-mouthed cup 3 to remove the lid 1, you can drink directly from the spout, making it convenient to carry and store.

[0101] In the specification and claims of this application, the terms "comprising / including" and "having / including" and variations thereof are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0102] Some features of this invention are described in different embodiments for clarity; however, these features may also be described in combination in a single embodiment. Conversely, some features of this invention are described only in a single embodiment for brevity; however, these features may also be described individually or in any suitable combination in different embodiments.

[0103] Finally, it should be noted that any cross-referencing or superposition of the various embodiments of this solution by those skilled in the art still falls within the original disclosure scope of this solution. Furthermore, the above descriptions are merely preferred embodiments of this utility model and are not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A modular support for a juicer, characterized in that, include: Internal support (10); as well as The motor (12), motherboard (14) and battery (13) are mounted on the inner bracket (10). The battery (13) is used to provide power to the motor (12) and motherboard (14).

2. The modular support for a juicer according to claim 1, characterized in that, The motor (12) has a motor shaft with a sealing plug installed on the motor shaft.

3. The modular support for a juicer according to claim 1, characterized in that, The inner bracket (10) is provided with two battery (13) slots; there are two batteries (13), and they are installed in the two battery (13) slots respectively. The motor (12) and the main board (14) are both screwed onto the inner bracket (10).

4. A modular base for a juicer, characterized in that, The modular support for a juicer as described in any one of claims 1-3 further includes: The base body (6) is hollow inside, open at the bottom, and equipped with a stirring blade driven by a motor (12) at the top; and Motor pressing component (16); The inner support (10) is located inside the base body (6).

5. The modular base for a juicer according to claim 4 of claim 2, characterized in that, The motor shaft is connected to the stirring blade; The stirring blade is a six-bladed steel blade (4); The motor clamp (16) abuts against the bottom of the motor (12), and the motor clamp (16) is locked to the bottom of the base body (6) by screws.

6. The modular base for a juicer according to claim 4, characterized in that, The base also includes: The bottom cover (20) is sealed and installed at the bottom of the base body (6); A bottom cover waterproof ring (19) is provided between the bottom cover (20) and the bottom of the base body (6) to seal the bottom cover (20).

7. The modular base for a juicer according to claim 6, characterized in that, The bottom cover (20) is provided with a countersunk hole, and the bottom cover (20) is threaded to the bottom of the base body (6) by passing a screw through the countersunk hole; The bottom cover (20) is also provided with a bottom cover plug (22) that seals the countersunk hole; The base (6) is also equipped with a switch (7) controlled by the main board (14) and used to start and stop the motor (12).

8. A modular juicer with a modular base, characterized in that, The modular base for a juicer, comprising any one of claims 4-7, further includes: Cup lid (1); The double-mouthed cup (3) has an open top and bottom. The top of the double-mouthed cup (3) is sealed by a cup lid (1) threaded connection, and the bottom of the double-mouthed cup (3) is sealed by a base body (6) threaded connection.

9. The modular juicer with a base according to claim 8, characterized in that, The juicer also includes a lid waterproof ring (2) for sealing the top of the double-mouthed cup (3) and a base waterproof ring (5) for sealing the bottom of the double-mouthed cup (3).

10. The modular juicer with a base according to claim 8, wherein when claim 8 refers to claim 6 or 7, it is characterized in that, The bottom of the cover (20) is provided with a middle frame decorative piece (18).