Rear cover assembly

Abstract

The utility model provides a rear cover assembly, comprising a rear housing which is provided with a combination port; the connecting piece is provided with a passing opening, a cylindrical matching piece is arranged on the inner side of the connecting piece, one end of the matching piece is connected with the passing opening, the outer wall of the matching piece is attached to the inner wall of the combining opening, and the outer wall of the matching piece is provided with a buckling piece with the triangular section. One end of the buckling piece abuts against the inner side of the rear shell, and the outer side of the rear shell and the inner side of the connecting piece are arranged in a spaced mode. The covering piece is connected with the connecting piece, and the inner side of the covering piece and the outer side of the connecting piece are arranged in a spaced mode. The rear cover assembly provided by the utility model can improve the assembly efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of beauty instruments and relates to a rear cover component. Background Art

[0002] A beauty instrument is a machine that adjusts and improves the body and face according to the physiological functions of the human body. It has many functions such as whitening, skin rejuvenation, freckle removal, wrinkle removal, hair removal, and weight loss. According to the name, it has ultrasonic introduction, photon skin rejuvenation, high-frequency electrotherapy, RF radio wave skin tightening, electronic spot removal, E-light permanent hair removal and skin rejuvenation, Jafani nutrition introduction and export, etc. The beauty medical industry was born in the 1990s and is based on the expansion of medicine, optics, electricity, chemistry and other fields. Professional researchers engaged in these fields seized business opportunities and entered the beauty industry with professional technology, allowing the beauty industry to adapt to the development of the times from traditional medical care, skin protection, massage and other projects, and become the new darling of high technology. More and more high-tech instruments are entering beauty salons, and beauty instruments have also experienced repeated updates. The size of large instruments has gradually developed from medium and small-sized instruments. Nowadays, small and micro instruments have gradually become a trend. The functions have gradually developed from single hair removal and whitening to multi-purpose machines, and the functions are becoming more and more perfect. The development of science and technology and its application in beauty instruments have made the functions of products more and more diverse and sophisticated.

[0003] At present, the common beauty devices on the market mainly include an outer shell and various electronic components located in the outer shell. When in use, the electronic components will generate a lot of heat, so there is also a fan in the outer shell for heat dissipation; when the fan is started, the outside air enters the outer shell, and the air passes through the heat-generating electronic components and is blown out to the outside, thereby achieving the effect of cooling the inside of the outer shell. The outer shell includes a front shell and a rear shell. The front shell acts on the skin when in use, and the back of the rear shell (also called the rear cover) has an air outlet on the back to discharge the hot air to the outside. Due to the production process, the rear shell usually includes several independent parts, and finally the parts are assembled by screw connection, which leads to low assembly efficiency. Utility Model Content

[0004] The utility model aims to provide a rear cover assembly, aiming to solve the problem of low assembly efficiency.

[0005] In order to solve the above technical problems, the utility model provides a back cover assembly, including:

[0006] A rear shell body, wherein a joint opening is formed on the rear shell body;

[0007] A connecting piece, wherein a through hole is formed on the connecting piece, a cylindrical matching piece is disposed on the inner side of the connecting piece, one end of the matching piece is connected to the through hole, the outer wall of the matching piece is fitted to the inner wall of the joint hole, a fastening piece with a triangular cross section is disposed on the outer wall of the matching piece, one end of the fastening piece is in contact with the inner side of the rear shell, and a gap is formed between the outer side of the rear shell and the inner side of the connecting piece;

[0008] The covering member is connected to the connecting member, and an inner side of the covering member and an outer side of the connecting member are spaced apart from each other.

[0009] The utility model is further configured that a receiving groove is provided on the outer side of the rear shell, and the connecting member and the covering member are both located in the receiving groove.

[0010] The utility model is further configured that a bending portion is provided on the outer side of the edge of the connecting member, the outer side of the bending portion abuts against the inner wall of the accommodating groove, and there is a gap between the outer edge of the covering member and the inner side of the bending portion.

[0011] The utility model is further configured as follows: a through opening is opened on the connecting member, a positioning portion is arranged on the inner side of the connecting member, the positioning portion is located on the side of the through opening, a buckling arm is arranged on the inner side of the covering member, the buckling arm passes through the through opening, the inner end of the buckling arm is bent to be provided with a buckling portion, and the outer side of the buckling portion abuts against the inner end of the positioning portion.

[0012] The utility model is further configured such that a bending portion is provided on one side of the inner end of the positioning portion close to the buckling arm, and when the covering member and the connecting member are close to each other, the outer side of the bending portion can act on the inner side of the buckling portion and drive the buckling arm to undergo elastic deformation, and when the buckling portion passes over the bending portion, the buckling arm elastically rebounds and causes the outer side of the buckling portion to contact the inner end of the bending portion.

[0013] The utility model is further configured that the rear shell is provided with a clearance opening for the buckle arm and the positioning portion to pass through.

[0014] The utility model is further configured that a plurality of the fastening members are arranged on the mating member, at least two of the fastening members are located outside the two ends of the mating member, and a plurality of the positioning parts are arranged on the connecting member, and the plurality of the positioning parts are distributed on the periphery of the mating member.

[0015] The utility model is further configured that the inner wall of the connecting piece is provided with a plurality of first protrusions, the inner wall of the covering piece is provided with a plurality of second protrusions, the first protrusions abut against the outer side of the rear shell body, the second protrusions abut against the outer side of the connecting piece, and the first protrusions and the second protrusions are both distributed on the periphery of the through-port.

[0016] The utility model is further configured such that a middle body is provided in the middle of the through port, the middle body divides the through port into two air outlets, the outer edges of the air outlets are chamfered or rounded, the inner edge of the rear shell body is provided with a plurality of external connection parts, and an external connection port is opened in the middle of the external connection parts.

[0017] The utility model is further configured that the inner wall of the rear housing is provided with an unlocking anti-slip portion, the unlocking anti-slip portion is located on the outer side of the matching piece, and there is a set distance between the unlocking anti-slip portion and the matching piece, the unlocking anti-slip portion is inclined on the side close to the matching piece, and the free end of the inclined part of the unlocking anti-slip portion faces the outer side of the matching piece, the buckle is located between the unlocking anti-slip portion and the matching piece, the rear housing is provided with an auxiliary port, the auxiliary port is directly opposite to the inner wall of the connecting piece, and the unlocking anti-slip portion is located between the auxiliary port and the matching piece. .

[0018] Compared with the prior art, the utility model provides a back cover assembly, first of all, the rear shell, connecting piece and covering piece are produced separately, and then when assembling the back cover assembly, the connecting piece needs to be snapped onto the rear shell; when snapping, it is only necessary to bring the connecting piece close to the rear shell and make the matching piece pass through the joint; when the matching piece moves in the joint, the outer wall of the snapping piece will hit the inner wall of the joint; but since the rear shell, connecting piece, matching piece and snapping piece are all made of plastic material, they have a certain elastic deformability, so that the matching piece can pass through the joint normally, until the snapping piece just crosses the joint, and each structure rebounds under the elastic restoring force, at this time making the outer end of the snapping piece hit the inner end of the rear shell, thus completing the connection between the rear shell and the connecting piece; subsequently, it is only necessary to connect the covering piece to the connecting piece; since the assembly is the combination of the connecting piece and the rear shell, it is only necessary to bring the two close to each other, so the operation is more convenient and the assembly efficiency is higher. Moreover, since the cross-section of the fastener is triangular, the fastener can be stably fastened to the inner side of the rear shell, and the connection between the connecting member and the rear shell has sufficient stability, which can effectively prevent the two from detaching, thereby improving the stability of the rear cover assembly.

[0019] During use, the rear cover assembly needs to assemble the rear shell and the front shell together, and the space formed between the two is used to install various electrical components and a cooling fan. When the cooling fan dissipates the heat inside, the external air preferably enters the space between the rear shell and the front shell through the front shell, and then passes through the matching parts, the gap between the rear shell and the connecting parts, and the gap between the connecting parts and the covering parts, and is blown out to the outside, thereby dissipating heat and cooling the internal electrical components. At the same time, the covering part can also play a role in dust prevention, etc., which can better extend the service life of the beauty instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of a rear cover assembly of the utility model. Figure 1 ;

[0021] Figure 2 yes Figure 1 A magnified view of part A;

[0022] Figure 3 It is a cross-sectional view of an embodiment of a rear cover assembly of the utility model;

[0023] Figure 4 yes Figure 3 A magnified view of part B;

[0024] Figure 5 This is a schematic diagram of the structure of an embodiment of a rear cover assembly of the utility model. Figure 2 ;

[0025] Figure 6 The utility model is a back cover assembly of an embodiment of the explosion Figure 1 ;

[0026] Figure 7 yes Figure 6 Enlarged view of part C;

[0027] Figure 8 yes Figure 6 A magnified view of part D in the middle;

[0028] Fig. 9 yes Figure 6 Enlarged view of part E in the middle;

[0029] Fig.10 The utility model is a back cover assembly of an embodiment of the explosion Figure 2 ;

[0030] Fig.11 yes Fig.10 Enlarged view of part F.

[0031] Among them, 1. rear shell body; 2. combining mouth; 3. connecting part; 4. through mouth; 5. matching part; 6. buckling part; 7. covering part; 8. accommodating groove; 9. bending part; 10. passing mouth; 11. positioning part; 12. buckling arm; 13. buckling part; 14. bending part; 15. giving way mouth; 16. first protrusion; 17. second protrusion; 18. middle body; 19. external connection part; 20. external connection mouth; 21. unlocking anti-slip part; 22. auxiliary mouth. DETAILED DESCRIPTION

[0032] The following is a further detailed description of a rear cover assembly proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the accompanying drawings represent the same or similar components.

[0033] A back cover assembly, such as Figures 1 to 11 As shown, including:

[0034] A rear housing 1, wherein a joint 2 is formed on the rear housing 1;

[0035] A connecting member 3, wherein a through hole 4 is formed on the connecting member 3, a cylindrical fitting member 5 is disposed on the inner side of the connecting member 3, one end of the fitting member 5 is connected to the through hole 4, the outer wall of the fitting member 5 is fitted to the inner wall of the joint 2, a fastening member 6 with a triangular cross section is disposed on the outer wall of the fitting member 5, one end of the fastening member 6 abuts against the inner side of the rear housing 1, and a gap is formed between the outer side of the rear housing 1 and the inner side of the connecting member 3;

[0036] The covering member 7 is connected to the connecting member 3 , and an inner side of the covering member 7 and an outer side of the connecting member 3 are spaced apart from each other.

[0037] The outer side of the rear housing 1 is provided with a receiving groove 8 , and the connecting member 3 and the covering member 7 are both located in the receiving groove 8 .

[0038] A bending portion 9 is provided on the outer side of the edge of the connecting member 3 , and the outer side of the bending portion 9 abuts against the inner wall of the accommodating groove 8 . There is a gap between the outer edge of the covering member 7 and the inner side of the bending portion 9 .

[0039] The connecting member 3 is provided with a through opening 10, and a positioning portion 11 is provided on the inner side of the connecting member 3. The positioning portion 11 is located on the side of the through opening 10. A snap-fit ​​arm 12 is provided on the inner side of the covering member 7. The snap-fit ​​arm 12 passes through the through opening 10. A snap-fit ​​portion 13 is bent at the inner end of the snap-fit ​​arm 12, and the outer side of the snap-fit ​​portion 13 abuts against the inner end of the positioning portion 11.

[0040] A bending portion 14 is provided on one side of the inner end of the positioning portion 11 close to the buckling arm 12. When the covering member 7 and the connecting member 3 approach each other, the outer side of the bending portion 14 can act on the inner side of the buckling portion 13 and drive the buckling arm 12 to undergo elastic deformation. When the buckling portion 13 passes over the bending portion 14, the buckling arm 12 elastically rebounds and causes the outer side of the buckling portion 13 to contact the inner end of the bending portion 14.

[0041] The rear housing 1 is provided with a clearance opening 15 for the buckling arm 12 and the positioning portion 11 to pass through.

[0042] There are several buckling parts 6 on the matching part 5, at least two of which are located outside the two ends of the matching part 5, and there are several positioning parts 11 on the connecting part 3, which are distributed around the periphery of the matching part 5. The wider distribution of buckling parts 6 and positioning parts 11 can make the connection between the rear housing 1, the connecting part 3 and the cover 7 more stable.

[0043] The inner wall of the connecting member 3 is provided with a plurality of first protrusions 16, and the inner wall of the covering member 7 is provided with a plurality of second protrusions 17, wherein the first protrusions 16 abut against the outer side of the rear housing 1, and the second protrusions 17 abut against the outer side of the connecting member 3, and the first protrusions 16 and the second protrusions 17 are both distributed at the periphery of the through opening 10. A middle body 18 is provided at the middle of the through opening 4, and the middle body 18 divides the through opening 4 into two air outlets, and the outer edges of the air outlets are chamfered or rounded.

[0044] The inner edge of the rear housing 1 is provided with a plurality of external connection parts 19 , and the middle of the external connection part 19 is provided with an external connection opening 20 .

[0045] The inner wall of the rear shell 1 is provided with an unlocking anti-slip portion 21, the unlocking anti-slip portion 21 is located on the outer side of the matching piece 5, and there is a set distance between the unlocking anti-slip portion 21 and the matching piece 5, the unlocking anti-slip portion 21 is inclined on the side close to the matching piece, and the free end of the inclined part of the unlocking anti-slip portion 21 faces the outer side of the matching piece 5, the buckle 6 is located between the unlocking anti-slip portion 21 and the matching piece 5, and the rear shell 1 is provided with an auxiliary port 22, the auxiliary port 22 is directly opposite to the inner wall of the connecting piece 3, and the unlocking anti-slip portion 21 is located between the auxiliary port 22 and the matching piece 5

[0046] The utility model provides a back cover assembly, firstly, the back shell 1, the connecting piece 3 and the covering piece 7 are produced separately, and then when assembling the back cover assembly, the connecting piece 3 needs to be buckled onto the back shell 1; when buckling, it is only necessary to bring the connecting piece 3 close to the back shell 1 and make the matching piece 5 pass through the joint opening 2; wherein when the matching piece 5 moves in the joint opening 2, the outer wall of the buckling piece 6 will abut against the inner wall of the joint opening 2; however, since the back shell 1, the connecting piece 3, the matching piece 5 and the buckling piece 6 are all made of plastic materials, they have a certain elastic deformation, so that the matching piece 5 can pass through the joint opening 2 normally, until the buckling piece 6 just crosses the joint opening 2, each structure rebounds under the elastic restoring force, at this time, the outer end of the buckling piece 6 abuts against the inner end of the back shell 1, so that the connection between the back shell 1 and the connecting piece 3 is completed; subsequently, it is only necessary to connect the connecting piece 3 with the covering piece 7; since the assembly is the combination of the connecting piece 3 and the back shell 1, it is only necessary to bring the two close to each other, so that the operation is more convenient and the assembly efficiency is higher. Moreover, since the cross-section of the fastener 6 is triangular, the fastener 6 can be stably fastened to the inner side of the rear shell 1, and the connection between the connector 3 and the rear shell 1 has sufficient connection stability, which can effectively prevent the two from detaching, thereby improving the stability of the rear cover assembly.

[0047] During use of the rear cover assembly, the rear shell 1 and the front shell need to be assembled together, and the space formed between the two is used to install various electrical components and a cooling fan; when the cooling fan is dissipating the heat inside, the external air preferably enters the space between the rear shell 1 and the front shell through the front shell, and then passes through the matching part 5, the gap between the rear shell 1 and the connecting part 3, and the gap between the connecting part 3 and the covering part 7, and is blown out to the outside, so that the internal electrical components can be dissipated and cooled; at the same time, the covering part 7 can also play a role in dust prevention, etc., which can better extend the service life of the beauty instrument.

[0048] During the actual assembly, after the fitting 5 passes through the joint 2, when the first protrusion 16 finally contacts the outer side of the rear housing 1, the fastening member 6 just passes over the rear housing 1, so that the outer end of the fastening member 6 contacts the inner end of the rear housing 1. At this time, under the action of the first protrusion 16 and the fastening member 6, the connecting member 3 and the rear housing 1 can be stably fastened.

[0049] Finally, the cover 7 is brought close to the connector 3, and each buckle arm 12 is passed through the corresponding through opening 10; in the process of moving the cover 7, the inner end of the buckle portion 13 will first act on the outer side of the curved portion 14, and then under the action of the two, the buckle arm 12 and the positioning portion 11 are elastically deformed, until the second protrusion 17 hits the outer side of the connector, the buckle portion 13 just passes over the curved portion 14, and then the buckle arm 12 and the positioning portion 11 are elastically deformed, and the outer end of the buckle portion 13 hits the inner end of the curved portion 14, at this time, the cover 7 and the connector 3 are fixedly connected, and under the joint action of the buckle portion 13, the curved portion 14 and the second protrusion 17, the cover 7 and the rear shell 1 can be stably connected. In this way, the assembly of the rear cover assembly is completed, which is simple, convenient and fast, and can also ensure the stability of the rear cover assembly after assembly.

[0050] The existence of the clearance opening 15 enables the positioning portion 11 and the buckle arm 12 to have a larger length, so that they can function normally when elastic deformation occurs. Secondly, the receiving groove 8 on the back of the rear housing 1 accommodates the connecting member 3 and the cover 7, so that the length of the cover 7 extending to the outside can be prevented or reduced, and the compactness of the entire rear cover assembly can be better maintained. At the same time, the cover 7 can be better prevented from acting on the outside, thereby ensuring the functional life of each connection structure (i.e., the positioning portion 11, the buckle arm 12, etc.).

[0051] During use, after the fan blows the hot air to the air outlet, under the action of the first protrusion 16 and the second protrusion 17, there are gaps between the connector 3 and the rear shell 1, and between the cover 7 and the connector 3, so that the hot air can be discharged normally. At the same time, since the outer periphery of the air outlet is rounded or chamfered, the resistance to the air flowing outward is smaller, which is conducive to heat dissipation; secondly, the middle body 18 can improve the strength of the matching part 5, etc., and can also play a role in diverting the hot air, so that the hot air can flow in all directions, so that the heat dissipation effect is better.

[0052] When the rear shell 1 is assembled with the front shell, the inner wall of the front shell has a structure similar to the snap-on arm 12 and the snap-on portion 13, and the two can be snapped together with the external connection portion 19 and the external connection port 20. After the snapping is completed, the rear shell 1 and the front shell can be snapped together and stably connected.

[0053] When disassembling, repairing or replacing the corresponding parts, it is only necessary to insert a flat-blade screwdriver into the gap between the unlocking anti-slip portion 21 and the matching piece 5, and then rotate the screwdriver toward the matching piece 5. At this time, under the action of the screwdriver, the matching piece 5 can be elastically deformed, and the snap-fitting piece 6 can be disengaged from the joint 2; not only that, since the side of the unlocking anti-slip portion 21 close to the matching piece 5 is inclined, it can better prevent the screwdriver from sliding, etc., so that the stability of driving the matching piece 5 is better; at the same time, after rotating the screwdriver, other tools can be used to pass through the auxiliary opening 22 and then contact the inner wall of the connecting piece 3, and push the connecting piece 3 outward, so that the connecting piece 3 can be separated from the rear shell 1, that is, the unlocking anti-slip portion 21 and the auxiliary opening 22 are in a mutually coordinated relationship during the whole process, which is used to quickly and conveniently disassemble the connecting piece 3 and the rear shell 1. In this embodiment, both the top and bottom of the matching piece 5 have fastening pieces 6, but there is only one unlocking anti-slip portion 21, which is located below the matching piece 5. In this way, when the lower fastening piece 6 is disengaged from the bottom of the joint 2, the upper fastening piece 6 can also be disengaged more conveniently.

[0054] It should also be understood that the present application can be used in beauty instruments as the back cover of beauty instruments, and can also be the back cover of other small and micro electrical appliances, such as shavers, hair removal instruments, skin care instruments, etc.

[0055] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A back cover assembly, characterized in that: include: A rear shell (1), wherein a joint opening (2) is provided on the rear shell (1); A connecting piece (3), wherein a through hole (4) is formed on the connecting piece (3), a cylindrical matching piece (5) is arranged on the inner side of the connecting piece (3), one end of the matching piece (5) is connected to the through hole (4), the outer wall of the matching piece (5) is fitted to the inner wall of the connecting hole (2), the outer wall of the matching piece (5) is provided with a fastening piece (6) with a triangular cross section, one end of the fastening piece (6) is in contact with the inner side of the rear shell (1), and a gap is formed between the outer side of the rear shell (1) and the inner side of the connecting piece (3); A covering member (7), wherein the covering member (7) is connected to the connecting member (3), and an inner side of the covering member (7) and an outer side of the connecting member (3) are spaced apart.

2. A back cover assembly according to claim 1, characterized in that: The outer side of the rear shell (1) is provided with a receiving groove (8), and the connecting member (3) and the covering member (7) are both located in the receiving groove (8).

3. A rear cover assembly according to claim 2, characterized in that: A bending portion (9) is provided on the outer side of the edge of the connecting member (3), the outer side of the bending portion (9) abuts against the inner wall of the accommodating groove (8), and a gap is formed between the outer edge of the covering member (7) and the inner side of the bending portion (9).

4. A back cover assembly according to any one of claims 1 to 3, characterized in that: The connecting member (3) is provided with a through opening (10), the inner side of the connecting member (3) is provided with a positioning portion (11), the positioning portion (11) is located at the side of the through opening (10), the inner side of the covering member (7) is provided with a buckling arm (12), the buckling arm (12) passes through the through opening (10), the inner end of the buckling arm (12) is bent to provide a buckling portion (13), the outer side of the buckling portion (13) abuts against the inner end of the positioning portion (11).

5. A rear cover assembly according to claim 4, characterized in that: A bent portion (14) is provided on one side of the inner end of the positioning portion (11) close to the buckling arm (12); when the covering member (7) and the connecting member (3) are close to each other, the outer side of the bent portion (14) can act on the inner side of the buckling portion (13) and drive the buckling arm (12) to undergo elastic deformation; when the buckling portion (13) passes over the bent portion (14), the buckling arm (12) elastically rebounds and causes the outer side of the buckling portion (13) to contact the inner end of the bent portion (14).

6. A rear cover assembly according to claim 4, characterized in that: The rear housing (1) is provided with a clearance opening (15) for the buckle arm (12) and the positioning portion (11) to pass through.

7. A rear cover assembly according to claim 5, characterized in that: A plurality of the fastening parts (6) are arranged on the matching part (5), and at least two of the fastening parts (6) are located outside the two ends of the matching part (5). A plurality of the positioning parts (11) are arranged on the connecting part (3), and the plurality of the positioning parts (11) are distributed around the periphery of the matching part (5).

8. A rear cover assembly according to claim 4, characterized in that: The inner wall of the connecting member (3) is provided with a plurality of first protrusions (16), and the inner wall of the covering member (7) is provided with a plurality of second protrusions (17), the first protrusions (16) abut against the outer side of the rear shell (1), and the second protrusions (17) abut against the outer side of the connecting member (3), and the first protrusions (16) and the second protrusions (17) are both distributed on the periphery of the through opening (10).

9. A rear cover assembly according to claim 1, characterized in that: A middle body (18) is provided in the middle of the through opening (4), and the middle body (18) divides the through opening (4) into two air outlets. The outer edges of the air outlets are chamfered or rounded. The inner edge of the rear shell (1) is provided with a plurality of external connection parts (19), and the middle of the external connection parts (19) is provided with an external connection opening (20).

10. A rear cover assembly according to claim 1, characterized in that: The inner wall of the rear shell (1) is provided with an unlocking anti-slip portion (21), the unlocking anti-slip portion (21) is located on the outer side of the matching piece (5), and a set distance is provided between the unlocking anti-slip portion (21) and the matching piece (5), the unlocking anti-slip portion (21) is inclined on the side close to the matching piece, and the free end of the inclined part of the unlocking anti-slip portion (21) faces the outer side of the matching piece (5), the buckle (6) is located between the unlocking anti-slip portion (21) and the matching piece (5), the rear shell (1) is provided with an auxiliary opening (22), the auxiliary opening (22) is directly opposite to the inner wall of the connecting piece (3), and the unlocking anti-slip portion (21) is located between the auxiliary opening (22) and the matching piece (5).

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