Ultrathin power adapter

Abstract

The utility model relates to an ultrathin power adapter, which comprises a shell, a control panel arranged in the shell, and a pin assembly, part of the pin assembly is arranged in the shell, part of the pin assembly is arranged outside the shell so that the pin assembly can rotate relative to the shell, a conducting strip for connecting the control panel with the pin assembly is arranged in the shell, and the conducting strip is connected with the control panel. A square groove is formed in the middle of the control panel, the transformer is arranged in the square groove, and the two sides of the transformer are arranged on the two sides of the control panel respectively, so that the thickness of the interior of the shell is slightly larger than that of the transformer. A square groove is formed in a control panel, a transformer is arranged in the square groove to reduce the thickness of the power adapter, meanwhile, an isolation cavity is formed in a shell through an isolation plate, large electronic elements are arranged in the isolation cavity to be connected with the control panel, and small electronic elements are arranged on the two sides of the control panel, so that the thickness of the power adapter is reduced as much as possible. Therefore, the ultrathin power adapter is formed.

Description

Technical Field

[0001] The utility model relates to the field of power adapters, in particular to an ultra-thin power adapter. Background Art

[0002] An adapter is an interface converter. It can be a standalone hardware interface device that allows hardware or electronic interfaces to connect to other hardware or electronic interfaces, or it can be an information interface. In computers, adapters are typically built into a card that plugs into a slot on the motherboard. The adapter information in the card is exchanged between the processor and the device supported by the adapter. A power adapter is a power conversion device for small portable electronic devices and electrical appliances. It generally consists of a housing, a power transformer, and a rectifier circuit. It can be categorized by output type: AC or DC; and by connection method: wall-mounted or desktop. Power adapters are particularly important for mobile PCs, as they lack batteries. The need for a transformer and numerous electronic components makes power adapters thick, preventing them from fully utilizing the space inside the housing.

[0003] At the same time, since the plug specifications of different countries are different, the plug pins are also different. In order to use the charger in different countries, you must carry a charger with the corresponding country specifications, otherwise you cannot use the socket. Sometimes when using, some sockets only provide two or three holes. At this time, the traditional power adapter will not be able to be inserted and used, which brings great inconvenience.

[0004] Chinese patent publication number CN216794832U discloses an ultra-thin power adapter, comprising an adapter chassis and a connecting cable mounted on one side of the adapter chassis. An adjustment unit is provided on the other side of the adapter chassis. The adjustment unit includes an adjustment gear and a transmission gear meshingly mounted on one side of the adjustment gear. Adjustment screws are provided on both sides of the transmission gear. A transmission thread block is provided at the upper end of the adjustment screw. A telescopic member is provided on one side of the transmission thread block. A fixed clamp is provided at one end of the telescopic member. The desired connecting wire is inserted into a connecting jack. Once the connection is secure, the adjustment gear drives the transmission gear to rotate. The adjustment screws on both sides of the transmission gear rotate, driving the transmission thread block to move, which in turn drives the telescopic member fixed on one side to move, extending the fixed clamp from the inside of the connecting jack to secure the connected wire. This prevents loosening and falling off during use, providing a more secure installation. The patent also does not describe how to achieve an ultra-thin power adapter. Furthermore, the power adapter has limited usage scenarios and cannot be used in multiple scenarios. It cannot be used in different countries or with sockets of different specifications, which presents certain deficiencies.

[0005] Chinese patent publication number CN207968340U discloses an ultra-thin power adapter that addresses the issue of components being easily affected during installation. The key technical solution is: it includes a PCB board, components are provided on the surface of the PCB board, and a first protective plate is provided on the surface of the PCB board facing away from the components. The first protective plate covers the surface of the PCB board, a second protective plate is fixed to the side of the first protective plate, and a third protective plate is fixed to the side of the second protective plate relative to the first protective plate. The surface of the third protective plate facing the first protective plate contacts the surface of the component facing away from the first protective plate. A connector is fixed between the sides of the first and third protective plates facing away from the second protective plate, thereby protecting the components. Although the patent is titled "Ultra-thin Power Adapter," its structure does not reflect how it achieves ultra-thinness. Furthermore, due to the large number of components provided on both sides of the PCB board, its thickness is often relatively large. Utility Model Content

[0006] The technical problem to be solved by the present invention is that power adapters require a transformer and numerous electronic components, resulting in a large thickness and inability to fully utilize the internal space of the housing. Furthermore, when using a charger in different countries, one must carry a charger with the corresponding country specifications, otherwise the socket cannot be used. Sometimes, some sockets only have two or three prongs, and conventional power adapters cannot be inserted into them, causing great inconvenience. To address the above-mentioned shortcomings of the prior art, an ultra-thin power adapter is provided.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An ultra-thin power adapter is constructed, comprising a shell and a control board arranged in the shell. The power adapter also includes a pin assembly, part of which is placed in the shell, and part of which is placed outside the shell so that the pin assembly can rotate relative to the shell. A conductive sheet is also provided in the shell to connect the control board and the pin assembly. A transformer is provided on the control board, which is connected to the mains power through the pins and then transmitted to the control board for output by the transformer at a reduced voltage. A square slot is provided in the middle of the control board, and the transformer is placed in the square slot. The two sides of the transformer are respectively placed on both sides of the control board so that the inner thickness of the shell is slightly greater than the thickness of the transformer.

[0009] Preferably, a cover plate is further provided in the shell, the pin assembly includes two groups of pins, and connecting columns connecting the two groups of pins, the connecting columns are placed between the cover plate and the shell, and can rotate between the cover plate and the shell, two groups of isolation plates are also provided in the shell, the pin assembly and the cover plate are placed between the two groups of isolation plates, and an isolation cavity is formed between the isolation plate and the inner wall of the shell, electronic components of different sizes are provided on the control board, large electronic components are placed in the isolation cavity, and small electronic components are placed on both sides of the control board, and one side of the square groove is connected to an oblique groove.

[0010] Preferably, the facing surfaces of the cover plate and the bottom shell are each provided with at least one set of press-fit columns, and the connecting column is placed between the press-fit columns and can rotate between the press-fit columns.

[0011] Preferably, two groups of pressing columns are provided on the opposite surfaces of the cover plate and the bottom shell, and arc grooves are provided on the pressing columns. The connecting columns are placed in the arc grooves and can rotate in the arc grooves. The pressing columns opposite to the cover plate and the bottom shell are in contact with each other.

[0012] Preferably, the conductive sheet includes a horizontal portion, a vertical portion connected to one end of the horizontal portion, and a movable portion connected to the other end of the horizontal portion, the movable portion maintains contact with the pin, the vertical portion is electrically connected to the control board, and a pressing portion is provided on the cover corresponding to the horizontal portion.

[0013] Preferably, a rotating block is provided at one end of the pin, the connecting column is connected via the rotating block, the rotating block rotates as the pin rotates, and the end of the pin passes through the rotating block and maintains contact with the movable part of the conductive sheet.

[0014] Preferably, the movable part is arranged at an angle, and the rotating block is provided with an inclined surface corresponding to the movable part. When the pin assembly is closed, the inclined surface is parallel to the movable part. The movable part is provided with an inner concave surface, and the cover plate is provided with a raised portion corresponding to the inner concave surface, and the raised portion provides a stopping force on the inner concave surface.

[0015] Preferably, at least two groups of fixing columns are provided in the shell, and at least one group of fixing holes are provided on the conductive sheet and the cover plate. The fixing columns pass through the fixing holes to connect the conductive sheet and the cover plate, and the height of the fixing columns is greater than the sum of the heights of the conductive sheet and the cover plate. A locking column is also provided in the shell, and the shell and the cover plate are locked by screws. The cover plate is provided with locking holes corresponding to the locking columns, and a countersunk hole is provided on the locking hole, and a nut is placed in the countersunk hole. An extension column is provided at the other end of the locking hole, and the extension column is sleeved on the outside of the locking column.

[0016] Preferably, the shell includes a bottom shell and an upper cover, and the bottom shell and the upper cover are connected by a sealing structure. A socket is provided on the bottom shell, and the pin assembly passes through the socket and can rotate in the socket. A plug-in area is provided on the outside of the bottom shell corresponding to the socket. When the pin assembly is closed, an adapter is inserted into the plug-in area to make the power adapter suitable for different scenarios.

[0017] Preferably, an isolation block is provided in the plug-in area, a slot is provided in the middle of the isolation block, the slot makes the direction of the adapter inserted into the pin assembly different from the direction of the adapter inserted into the socket, and a limiting hole is provided on the side of the bottom shell.

[0018] The beneficial effects of the present invention are as follows: by providing a square slot on the control panel, the transformer is placed in the square slot to reduce the thickness of the power adapter, and an isolation plate is provided to form an isolation cavity in the shell, large electronic components are placed in the isolation cavity and connected to the control panel, and small electronic components are placed on both sides of the control panel to reduce the thickness of the power adapter as much as possible, forming an ultra-thin power adapter. The countersunk hole provided on the cover plate allows the nut to be placed therein, which further reduces the thickness of the assembled power adapter. The outer flange at the end of the pin assembly contacts the movable part of the conductive sheet to ensure stable contact between the pin assembly and the conductive sheet, thereby improving the stability of the power adapter. The inner recess and protrusion provided at the same time further ensure the contact between the pin and the conductive sheet. A plug-in area is provided on the outside of the bottom shell, which connects to the adapter to expand the use scenarios of the power adapter. At the same time, due to the provision of the slot, the moving direction of the plug connector and the pin is different from the direction of inserting the power adapter into the socket, ensuring the safety of the adapter connection and use, making it safer and more reliable to use. At the same time, the ultra-thin power adapter is more convenient to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a power adapter according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded structure of a power adapter according to a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the power adapter of a preferred embodiment of the utility model with the pins in the open state;

[0023] Figure 4This is a schematic structural diagram of a power adapter (without the upper cover) according to a preferred embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of a control panel in a preferred embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the axial perspective structure of a cover plate of a preferred embodiment of the present utility model;

[0026] Figure 7 This is another axial perspective structural diagram of the cover plate of a preferred embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the axial perspective structure of the pin assembly of a preferred embodiment of the present utility model;

[0028] Figure 9 This is a schematic structural diagram of a power adapter (without the upper cover and cover plate) according to a preferred embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of a conductive sheet according to a preferred embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the axial perspective structure of the bottom shell of a preferred embodiment of the present utility model;

[0031] Figure 12 This is another axial perspective structural diagram of the bottom shell of a preferred embodiment of the present invention;

[0032] Figure 13 This is another axial perspective structural diagram of the bottom shell of a preferred embodiment of the present utility model;

[0033] Figure 14 For the preferred embodiment of the utility model Figure 13 A in the figure shows the enlarged structural diagram;

[0034] Figure 15 This is a schematic diagram of the axial structure of the upper cover of a preferred embodiment of the utility model;

[0035] Figure 16 For the preferred embodiment of the utility model Figure 15 A schematic diagram of the structure at point B in FIG.

[0036] Figure 17 This is a schematic top view of the power adapter of a preferred embodiment of the present utility model;

[0037] Figure 18 For the preferred embodiment of the utility model Figure 17 Schematic diagram of the cross-section structure in the AA direction;

[0038] Figure 19 For the preferred embodiment of the utility model Figure 18 The enlarged structural diagram at C in FIG. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] An ultra-thin power adapter according to a preferred embodiment of the present invention; Figure 1-3 As shown, it includes a housing 1 and a pin assembly 2 rotatably connected to the housing. A control board 5 and two sets of conductive plates 3 connected to the control board are disposed within the housing. The conductive plates 3 are fixed within the housing via a cover plate 4. One end of the conductive plate 3 is connected to the control board via a connecting wire, and the other end is electrically connected to the pin assembly. The pin assembly is inserted into a socket to supply power to the power adapter, which is then transmitted through the conductive plates to the control board. The output port 50 of the control board is connected to the data cable for output. A through hole 100 is provided on the bottom housing corresponding to the output port. To reduce the input voltage, a transformer 51 is provided on the control board. The input voltage is stepped down by the transformer before being output.

[0041] Specifically, such as Figure 2 and Figure 4-5 As shown, in order to reduce the thickness of the power adapter, a square groove 53 is provided on the side of the control board 5, and the transformer 51 is connected to the control board at the square groove. Since the transformer is relatively thick and the other electronic components 54 are relatively thin and need to be distributed on both sides of the control board, the control board is connected to the middle of the transformer. An oblique groove 52 is also provided on the control board, which is connected to the square groove. Glue injection in the square groove also facilitates the installation and fixation of the transformer at the square groove of the control board.

[0042] Furthermore, if Figure 3-4 As shown, the housing 1 comprises a base 10 and an upper cover 11, ultrasonically welded together. The base is open only at its upper end. The upper cover 11 is positioned at this opening and connects to the base, securing the control board within the housing. Two sets of partitions 101 are located at the upper end of the base 10. These partitions form an isolation cavity 102 with the inner wall of the base, where some large electronic components connected to the control board can be placed. Two sets of jacks 105 are formed between the two sets of partitions. The pin assembly partially passes through the jacks and is located outside the housing, while the other portion resides inside. The pin assembly can be rotated relative to the housing to open and close.

[0043] Furthermore, if Figure 6-9and Figure 11 As shown, the pin assembly 2 includes two sets of pins 20, each connected to a rotating block 21. The pin assembly also includes connecting posts 22 that connect the two rotating blocks. The pin ends extend through the rotating block, forming a protruding end 200. A cover plate 4 is also provided within the housing, connecting the pin assembly to the bottom shell. The two sets of pins are inserted through the sockets 105. A compression post 42 is provided between the two sets of partitions, and two sets of compression posts 42 are also provided on the corresponding cover plate. These four sets of compression posts compress the upper and lower sides of the connecting posts, allowing the rotating post to rotate in the space between the compression posts, thereby driving the pins to rotate. To further prevent the rotating post from moving forward and backward, the compression posts are provided with arcuate grooves 420. The rotating post is positioned in the arcuate grooves, and the compression posts on the cover plate and the compression posts on the bottom shell contact each other, allowing the rotating post to rotate freely within the arcuate grooves.

[0044] Furthermore, if Figure 6-11 As shown, the conductive sheet 3 is also arranged between the cover plate 4 and the bottom shell 10, and the cover plate 4 includes a pressing portion 40, on which four groups of fixing holes 400 are provided. The conductive sheet 3 is provided with a horizontal portion 30 corresponding to the pressing portion, and the horizontal portion is fixed by the pressing portion and the bottom shell, and four groups of fixing columns 104 are provided on the bottom shell, and four groups of fixing holes 400 are provided on the horizontal portion corresponding to the fixing columns. The fixing columns are inserted into the fixing holes, and each group of conductive sheets corresponds to two groups of fixing holes, which can avoid the rotation of the conductive sheet. It should be noted that the height of the fixing column should be greater than the superimposed height of the conductive sheet and the fixing portion, that is, when the fixing column is inserted into the fixing hole of the conductive sheet and the pressing portion, part of the fixing column still protrudes. One end of the horizontal portion 30 is integrally connected to a handle portion 31. The vertical portion is perpendicular to the cover plate and connected to the control board through-hole connection line. The other end of the horizontal portion is integrally connected to a movable portion 32. The movable portion is inclined, and a bevel 210 is provided on the rotating block corresponding to the movable portion. When the plug assembly is closed, the bevel and the inclined portion remain parallel. When the rotating plug drives the rotating block, the outer protrusion exerts a compressive force on the movable portion, ensuring stable contact between the plug and the conductive sheet. The parallel arrangement also reduces the rotational force during the rotation of the plug assembly, facilitating the opening of the plug. To reduce the excessive pressure exerted by the outer protrusion on the movable end, the movable portion is provided with an inner recess 33, on which the outer protrusion rotates and maintains contact. A raised portion 41 is provided on the cover plate corresponding to the movable end. This raised portion provides a stopping force on the movable portion, preventing the movable portion from excessive movement and losing contact with the connection block. Therefore, when the movable portion is fully in contact with the raised portion, the outer protrusion maintains contact with the inner recess, allowing electrical conduction.

[0045] Furthermore, if Figure 6-7 and Figure 11As shown, two groups of locking posts 103 are provided on the bottom shell 10, and locking holes are provided on the cover plate 4 corresponding to the locking posts. After the pin assembly and the conductive sheet are fixed through the cover plate, the screws are locked into the locking holes and connected to the locking posts to connect the cover plate to the bottom shell. In order to prevent the height of the screw from affecting the thickness of the power adapter, a countersunk hole 401 is provided on the locking hole, and the nut end is placed in the countersunk hole, and an extension post 402 is provided at the other end of the locking hole. The extension post is sleeved on the outside of the locking post to further prevent the cover plate from moving left and right.

[0046] Furthermore, if Figure 3 and Figure 12 As shown, in order to improve the versatility of the power adapter, a plug-in area 107 is provided on the outside of the bottom shell 10 corresponding to the pin assembly 2. The pin assembly rotates in the plug-in area. An isolation block 1070 is provided in the middle of the plug-in area. Two groups of pins are placed on both sides of the isolation block. The triangular adapter and the like can be inserted into the pins through the plug-in area to achieve the adaptation of the power adapter to different scenarios. It can be adapted to plugs of different national specifications, as well as triangular plugs, etc. Slots 1071 are provided on the left and right sides of the isolation block. The setting of the slots allows the adapter to be inserted into the plug-in area in only a single direction. In the present utility model, it is inserted or removed by moving it up and down, and the power adapter installed with the adapter is inserted into the socket in the front and back direction, which avoids the loosening of the adapter during the insertion process and is safer. At the same time, in order to facilitate the perception of the plug-in of the adapter, a limiting hole 108 is provided on the side of the bottom shell. When the limiting hole on the adapter slides into the limiting hole, it indicates that it is installed in place.

[0047] Furthermore, if Figure 13-19 As shown, in order to reduce the contact area between the control board 5 and the electronic components 54 and the interior of the housing 1, support ribs 106 are provided inside the bottom shell 10 and the upper cover 11. The support ribs reduce the contact area to improve the heat dissipation effect. Sealing columns 109 are provided around the upper end of the bottom shell, and multiple groups of ultrasonic welding blocks 1090 are provided on the sealing columns. The upper cover is provided with a sealing groove 110 corresponding to the sealing columns. The sealing columns are inserted into the sealing groove and ultrasonic welding is used to achieve the connection between the upper cover and the bottom shell. An inner convex column 110 is provided on the inside of the sealing groove, and an outer convex column 113 is provided on the outside. The height of the inner convex column is greater than the height of the outer convex column, so that the inner convex column can achieve a further sealing effect. An outer convex ring 114 is provided on the outside of the outer convex column. A gap 12 is formed between the outer convex ring and the bottom shell, which facilitates the disassembly of the welded shell without the need for particularly tough means to forcibly disassemble it. After disassembly, the intact internal parts can still be reused, saving costs. At the same time, two groups of protrusions 112 are provided on one side of the outer boss 113. The protrusions correspond to the ends of the pin assemblies, and the installation direction of the upper cover can be identified by the protrusions.

[0048] It should be understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. An ultra-thin power adapter comprising a housing and a control board disposed within the housing. The power adapter further comprises a pin assembly, some of which are disposed within the housing and some of which are disposed outside the housing so that the pin assembly can rotate relative to the housing. The housing further comprises a conductive sheet connecting the control board to the pin assembly, characterized in that: The control board is provided with a transformer, which is connected to the mains power through the plug pins and transmitted to the control board and output by the transformer at a reduced voltage. A square slot is provided in the middle of the control board, and the transformer is placed in the square slot. The two sides of the transformer are respectively placed on both sides of the control board so that the inner thickness of the shell is slightly larger than the thickness of the transformer.

2. The power adapter according to claim 1, wherein: A cover plate is also provided in the shell, and the pin assembly includes two groups of pins and connecting columns connecting the two groups of pins. The connecting columns are placed between the cover plate and the shell and can rotate between the cover plate and the shell. Two groups of isolation plates are also provided in the shell, and the pin assembly and the cover plate are placed between the two groups of isolation plates. An isolation cavity is formed between the isolation plate and the inner wall of the shell. Electronic components of different sizes are provided on the control board, with large electronic components placed in the isolation cavity and small electronic components placed on both sides of the control board. One side of the square groove is connected to an oblique groove.

3. The power adapter according to claim 2, wherein: At least one group of press-fitting columns are provided on the opposite surfaces of the cover plate and the bottom shell, and the connecting column is placed between the press-fitting columns and can rotate between the press-fitting columns.

4. The power adapter according to claim 3, wherein: The opposite surfaces of the cover plate and the bottom shell are each provided with two sets of pressing columns, each of which is provided with an arc groove, the connecting column is placed in the arc groove and can rotate in the arc groove, and the pressing columns opposite to the cover plate and the bottom shell are in contact with each other.

5. The power adapter according to claim 2, wherein: The conductive sheet includes a horizontal portion, a vertical portion connected to one end of the horizontal portion, and a movable portion connected to the other end of the horizontal portion. The movable portion maintains contact with the pin, the vertical portion is electrically connected to the control board, and a pressing portion is provided on the cover corresponding to the horizontal portion.

6. The power adapter according to claim 5, wherein: A rotating block is provided at one end of the pin, the connecting column is connected via the rotating block, the rotating block rotates as the pin rotates, and the end of the pin passes through the rotating block and keeps in contact with the movable part of the conductive sheet.

7. The power adapter according to claim 6, wherein: The movable part is arranged at an angle, and the rotating block is provided with an inclined surface corresponding to the movable part. When the pin assembly is closed, the inclined surface is parallel to the movable part. The movable part is provided with an inner concave surface, and the cover plate is provided with a convex part corresponding to the inner concave surface. The convex part provides a stopping force on the inner concave surface.

8. The power adapter according to claim 5, wherein: At least two groups of fixing columns are provided in the shell, and at least one group of fixing holes are provided on the conductive sheet and the cover plate. The fixing columns pass through the fixing holes to connect the conductive sheet and the cover plate, and the height of the fixing columns is greater than the sum of the heights of the conductive sheet and the cover plate. A locking column is also provided in the shell, and the shell and the cover plate are locked by screws. The cover plate is provided with locking holes corresponding to the locking columns, and a countersunk hole is provided on the locking hole. A nut is placed in the countersunk hole. An extension column is provided at the other end of the locking hole, and the extension column is sleeved on the outside of the locking column.

9. The power adapter according to claim 1, wherein: The shell includes a bottom shell and an upper cover, and the bottom shell and the upper cover are connected by a sealing structure. A socket is provided on the bottom shell, and the pin assembly passes through the socket and can rotate in the socket. A plug-in area is provided on the outside of the bottom shell corresponding to the socket. When the pin assembly is closed, an adapter is inserted into the plug-in area to make the power adapter suitable for different scenarios.

10. The power adapter according to claim 9, wherein: An isolation block is provided in the plug-in area, a slot is provided in the middle of the isolation block, the slot makes the direction of the adapter inserted into the pin assembly different from the direction of the adapter inserted into the socket, and a limiting hole is provided on the side of the bottom shell.

Images