Digital network set top box without metal fastener

Abstract

The invention discloses a digital network set top box without a metal fastener, which relates to the technical field of set top boxes, and comprises a shell, a cover body and a circuit board, a mounting space is formed in the shell; the cover body is detachably connected with the shell, and the cover body can cover the opening of the mounting space; the shell is provided with a plurality of supporting tables at the bottom of the installation space, and when the circuit board abuts against the supporting tables in a contact mode, the circuit board is located in the installation space. The shell is provided with a plurality of positioning pieces, and a plurality of positioning grooves are correspondingly formed in the edge of the circuit board; the cover body extends outwards to form a plurality of elastic plug connectors, and the shell is correspondingly provided with a plurality of plug grooves; one end, far away from the cover body, of the plug connector is provided with a clamping part, and the shell is provided with a clamping groove at one side of the plug groove. The set top box is stable in connection, can effectively ensure the structural stability of the set top box, and is convenient to disassemble and assemble and convenient for subsequent maintenance.

Description

Technical Field

[0001] The present application relates to the technical field of set-top boxes, and in particular to a digital network set-top box without metal fasteners. Background Art

[0002] At present, with the rapid development of Internet technology, digital network set-top boxes have become an indispensable part of modern families. Such devices are not only used to receive satellite TV signals, but also support various online video services, greatly enriching people's audio-visual experience.

[0003] However, in the traditional set-top box design, in order to ensure a stable connection between the outer shell and the internal components, several common solutions on the market include but are not limited to: 1. Screw fixing method, by presetting holes in different parts of the set-top box and then fastening with screws. This method is simple and reliable, but it increases the difficulty and cost of assembly, and also makes later maintenance more difficult. 2. Adhesive fixing, this method can achieve seamless connection and beautiful appearance, but the glue is prone to aging and falling off in high temperature or humid environment, which also affects product quality.

[0004] Although the above two solutions have their unique advantages, they are also accompanied by obvious limitations. Therefore, there is an urgent need for a digital network set-top box with stable connection and convenient assembly and disassembly. Summary of the invention

[0005] The present application provides a digital network set-top box without metal fasteners, which has a stable connection and can effectively ensure the structural stability of the set-top box, while being easy to disassemble and assemble and facilitate subsequent maintenance.

[0006] The present application provides a digital network set-top box without metal fasteners, which adopts the following technical solution: A digital network set-top box without metal fasteners, comprising a shell, a cover and a circuit board; The housing has an installation space for installing the circuit board, and the installation space passes through the top of the housing to form an opening; the cover body is detachably connected to the housing, and the cover body can cover the opening of the installation space; The housing has a plurality of support platforms at the bottom of the installation space for supporting the circuit board. When the circuit board contacts and abuts against the support platforms, the circuit board is located in the installation space. The housing has a plurality of positioning members at the edge of the installation space, and the edge of the circuit board is correspondingly provided with a plurality of positioning grooves for the positioning members to be inserted into, and a plurality of the positioning members can be inserted into a plurality of the positioning grooves at the same time; A plurality of elastic plug-in parts extend outward from the cover body, and a plurality of corresponding plug-in slots for the plug-in parts to be inserted are provided on the shell; the plug-in part has a snap-in portion at one end away from the cover body, and the shell has a snap-in slot on one side of the snap-in slot for the snap-in portion to be snapped into.

[0007] By adopting the above technical solution, the screwless design can effectively improve the aesthetics of the set-top box, facilitate the disassembly and assembly of the set-top box while improving its durability, and can also simplify the production and maintenance process of the set-top box, thereby reducing overall costs and improving user experience; in addition, it can effectively improve the position stability of the circuit board in the installation space, thereby effectively ensuring the structural stability of the set-top box.

[0008] Optionally, the positioning member is elastic, and the positioning member and the positioning groove are interference fit.

[0009] By adopting the above technical solution, the positioning effect of the circuit board after installation in the installation space can be improved, and at the same time, the probability of damage to the circuit board or the positioning member due to friction between the positioning member and the positioning groove can be effectively reduced.

[0010] Optionally, a plurality of expansion members are disposed on the cover body, and the plurality of expansion members correspond one-to-one to the plurality of positioning members; The positioning member is provided with an expansion slot for inserting the expansion member. After the cover body is connected to the shell, the expansion member is inserted into the corresponding expansion slot, and both sides of the expansion member close to the expansion slot expand outwards.

[0011] By adopting the above technical solution, the connection stability between the cover and the housing can be effectively improved, and the position stability of the circuit board in the installation space can be further improved.

[0012] Optionally, a limiting member is provided on the positioning member; The limiting member is rotatably connected to the positioning member, and the rotation axis of the limiting member is perpendicular to the direction in which the expansion member is inserted into the expansion slot; a matching slot for the positioning member to pass through is provided on the limiting member, and the positioning member and the matching slot are interference-fitted; When the limiting member rotates to a limit position in a direction close to the expansion slot, the limiting member can contact and abut against the top of the circuit board.

[0013] By adopting the above technical solution, the limiting member can effectively limit the upward and downward movement of the circuit board in the installation space, thereby further effectively improving the position stability of the circuit board in the installation space.

[0014] Optionally, a first elastic member is connected between the limiting member and the positioning member, and the first elastic member has a tendency to drive the limiting member to rotate to a limit position in a direction close to the expansion slot.

[0015] By adopting the above technical solution, the limiting effect of the limiting member on the circuit board can be effectively improved, thereby further effectively improving the position stability of the circuit board in the installation space.

[0016] Optionally, after the limiting member rotates in a direction away from the expansion slot until the positioning member leaves the matching slot, the limiting member can maintain contact and abutment with the positioning member under the action of the first elastic member.

[0017] By adopting the above technical solution, the position stability of the limiting member after the limiting effect on the circuit board is released can be improved, so that the user can easily disassemble, replace and repair the circuit board, making the use of the limiting member more convenient and quick.

[0018] Optionally, the plug-in slot is located inside the peripheral structure of the shell, one end of the snap-in slot is communicated with the bottom of the plug-in slot, and the other end of the snap-in slot passes through the peripheral surface of the shell to form an opening.

[0019] By adopting the above technical solution, while facilitating the user to release the connection between the cover and the shell, the appearance of the set-top box can be effectively guaranteed, and the probability of the cover and the shell being mistakenly separated due to external force on the set-top box can be effectively reduced.

[0020] Optionally, a plurality of sliders are further provided on the housing, and the plurality of sliders correspond one-to-one to the plurality of clamping grooves; The slider is located in the snap-in groove and can slide along the snap-in groove; when the slider slides to an extreme position in a direction away from the installation space, the snap-in portion can be snapped into the snap-in groove; when the slider slides to an extreme position in a direction close to the installation space, the slider can drive the snap-in portion to leave the snap-in groove.

[0021] By adopting the above technical solution, it can be further convenient for users to release the connection between the cover body and the shell body, and at the same time, the aesthetic appearance of the set-top box can be further improved.

[0022] Optionally, a plurality of second elastic members are connected between the slider and the shell, and the second elastic members have a tendency to drive the slider to slide to an extreme position in a direction away from the installation space.

[0023] By adopting the above technical solution, the appearance of the set-top box can be further effectively guaranteed, and at the same time, the shell can be kept in a state where the cover body is installed and connected thereto.

[0024] Optionally, a side of the sliding block close to the installation space has a contact surface for contacting the clamping portion, the contact surface is an inclined surface, and an end of the contact surface close to the installation space is an inclined lower end.

[0025] By adopting the above technical solution, after the slider drives the clamping part to leave the clamping slot, the contact surface can exert an upward force on the clamping part, thereby facilitating the plug-in part to leave the plug-in slot, and further facilitating the separation of the cover body and the shell.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. Make the set-top box easy to disassemble and assemble, and facilitate subsequent maintenance; 2. The structures of the set-top box are firmly connected, thus effectively ensuring the structural stability of the set-top box; 3. It can effectively improve the position stability of the circuit board in the installation space, so that the set-top box can remain stable in use; 4. While ensuring the aesthetic appearance of the set-top box, it is convenient for users to remove and separate the cover and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a digital network set-top box without metal fasteners according to an embodiment of the present application; Figure 2 It is an exploded view of a digital network set-top box without metal fasteners according to an embodiment of the present application; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the internal structure of a digital network set-top box without metal fasteners according to an embodiment of the present application; Figure 5 It is a schematic diagram of the partial structure of the interior of a digital network set-top box without metal fasteners according to an embodiment of the present application.

[0028] Explanation of the accompanying drawings: 1. Shell; 11. Installation space; 12. Support platform; 13. Positioning member; 131. Expansion slot; 14. Limiting member; 141. Matching slot; 15. Plug-in slot; 16. Clamping slot; 2. Cover body; 21. Expansion member; 22. Plug-in member; 23. Clamping part; 3. Circuit board; 31. Positioning slot; 4. First elastic member; 5. Slider; 51. Contact surface; 6. Second elastic member. DETAILED DESCRIPTION

[0029] The following combination Figure 1-Figure 5 This application is described in further detail.

[0030] The embodiment of the present application discloses a digital network set-top box without metal fasteners, which can effectively facilitate users to disassemble and assemble the set-top box while ensuring the beautiful appearance of the set-top box, and can effectively ensure the structural stability of the set-top box during use.

[0031] Reference Figure 1 and Figure 2 The set-top box includes a housing 1, a cover 2 and a circuit board 3. After the housing 1 and the cover 2 are installed and connected, they can provide stable and effective protection for the circuit board 3; the circuit board 3 is used to implement digital network-related functions of the set-top box.

[0032] The housing 1 is a rectangular parallelepiped structure as a whole. The housing 1 has an installation space 11 inside for installing the circuit board 3 . The installation space 11 runs through one side of the housing 1 in the height direction to form an opening for facilitating the installation of the circuit board 3 in the installation space 11 .

[0033] The circuit board 3 is a rectangular plate-shaped structure as a whole. After being installed in the installation space 11, the length direction of the circuit board 3 is parallel to the length direction of the housing 1, and the width direction of the circuit board 3 is parallel to the width direction of the housing 1. In this embodiment, the circuit board 3 is preferably centered in the installation space 11 after being installed.

[0034] The housing 1 has a plurality of support platforms 12 at the bottom of the installation space 11 for supporting the circuit board 3. After the circuit board 3 is installed in the installation space 11, the bottom of the circuit board 3 will contact and abut against the plurality of support platforms 12 at the same time. In this embodiment, it is preferred that the housing 1 has a total of four support platforms 12, which are distributed in pairs at both ends of the installation space 11 along the length direction of the housing 1 and are distributed symmetrically.

[0035] Reference Figure 2 and Figure 3 The housing 1 has a plurality of elastic positioning members 13 at the edge of the installation space 11, and a plurality of positioning grooves 31 adapted to the positioning members 13 are correspondingly provided at the edge of the circuit board 3; when the circuit board 3 is installed in the installation space 11, the plurality of positioning members 13 are respectively engaged with the plurality of positioning grooves 31 on the circuit board 3 in an interference fit manner. In this embodiment, preferably, the housing 1 has a total of four positioning members 13, and preferably, the four positioning members 13 are respectively located above the four support platforms 12; correspondingly, preferably, the circuit board 3 has a total of four positioning grooves 31.

[0036] The limiting member 14 is rotatably mounted on the positioning member 13, and the rotation axis of the limiting member 14 is parallel to the width direction of the housing 1; the limiting member 14 is provided with a matching groove 141 for the top of the positioning member 13 to be inserted into, and during the rotation of the limiting member 14 relative to the positioning member 13, the matching groove 141 can be engaged with the top of the corresponding positioning member 13 and can also be released from the engagement with the top of the corresponding positioning member 13. In this embodiment, the top of the positioning member 13 is preferably engaged with the matching groove 141 by interference fit.

[0037] The limiting member 14 is limited in its rotation relative to the positioning member 13 . When the limit member 14 rotates to the extreme position in the direction close to the center of the installation space 11, the matching groove 141 on the limit member 14 can be interference fit with the top of the corresponding positioning member 13. At this time, the friction between the limit member 14 and the corresponding positioning member 13 can keep the limit member 14 fixed relative to the corresponding positioning member 13. At this time, if the circuit board 3 is installed in the installation space 11, the end of the limit member 14 away from its own rotation axis will contact and abut against the top of the circuit board 3. After the circuit board 3 is subjected to the force of the limit member 14, the limit member 14 will limit the displacement of the circuit board 3 along the height direction of the shell 1; when the limit member 14 rotates to the extreme position in the direction away from the center of the installation space 11, the matching groove 141 on the limit member 14 will release the interference fit with the top of the corresponding positioning member 13, and the limit member 14 as a whole will be located on the side of the corresponding positioning member 13 away from the center of the installation space 11, so that the circuit board 3 can be positioned and installed in the installation space 11 through four positioning members 13.

[0038] Reference Figure 4 and Figure 5 Furthermore, in order to improve the limiting effect of the limiting member 14 on the circuit board 3 installed in the installation space 11, a first elastic member 4 is preferably installed between the limiting member 14 and the positioning member 13.

[0039] Reference Figure 3 and Figure 5 The first elastic member 4 is installed at the rotation connection position of the limit member 14 and the positioning member 13, and its two ends are fixedly connected to the limit member 14 and the positioning member 13 respectively, and it has a tendency to drive the limit member 14 to rotate to the limit position in the direction close to the center of the installation space 11. In this embodiment, the first elastic member 4 is preferably a torsion spring; since the torsion spring is a common prior art, it is not described here, and only the installation position of the first elastic member 4 is shown in the drawings.

[0040] When the limit member 14 rotates to a state where it releases the snap fit with the top of the corresponding positioning member 13, the limit member 14 will maintain a state of contact and abutment with the corresponding positioning member 13 under the action of the first elastic member 4, that is, the limit member 14 is at the critical point of opening a snap fit with the top of the corresponding positioning member 13, and at this time the limit member 14 can maintain its current position state under the action of the first elastic member 4.

[0041] Reference Figure 1 and Figure 2 The cover body 2 is a rectangular plate-shaped structure as a whole, and the size of the cover body 2 is adapted to the size of the shell 1; the cover body 2 is detachably connected to the shell 1, and when the cover body 2 is connected to the shell 1, the cover body 2 can cover the opening of the installation space 11.

[0042] Reference Figure 2 and Figure 3 , one side of the cover body 2 in the thickness direction extends outward along its own thickness direction with four expansion pieces 21, and the four expansion pieces 21 correspond to the four positioning pieces 13 one by one; the positioning piece 13 is provided with an expansion slot 131 for the expansion piece 21 to be inserted, and the expansion piece 21 is inserted into the expansion slot 131 and has an interference fit with the expansion slot 131, and can expand the part of the positioning piece 13 on both sides of the expansion slot 131; when the positioning piece 13 is engaged with the positioning slot 31 on the circuit board 3, the expansion of the positioning piece 13 can further improve the stability of the engagement between the positioning piece 13 and the positioning slot 31 on the circuit board 3. In this embodiment, the expansion slot 131 is preferably located on the side of the positioning piece 13 close to the center of the installation space 11, and the expansion slot 131 is preferably formed through the side of the positioning piece 13 close to the center of the installation space 11 to form an opening and through both ends of the positioning piece 13 in the vertical direction to form openings.

[0043] When the limiting member 14 has a limiting effect on the circuit board 3, after the cover body 2 is connected to the shell body 1 so that the expansion member 21 is inserted into the corresponding expansion groove 131, the interference fit between the corresponding positioning member 13 and the corresponding matching groove 141 on the limiting member 14 can be strengthened, thereby further improving the position stability of the limiting member 14 relative to the positioning member 13 at this time, and at the same time, the interference fit between the corresponding positioning member 13 and the positioning groove 31 on the circuit board 3 can be strengthened, thereby further improving the position stability of the circuit board 3 in the installation space 11 at this time, thereby further improving the position stability of the circuit board 3 in the installation space 11.

[0044] Reference Figure 2 and Figure 5Furthermore, in order to improve the connection stability after the cover 2 and the housing 1 are detachably connected, it is preferred that a plurality of plug-in connectors 22 extend outwardly from the edge of the cover 2 along its thickness direction, and the end of the plug-in connector 22 has a clamping portion 23 on the side away from the center of the cover 2. In this embodiment, it is preferred that the cover 2 has two plug-in connectors 22, which are respectively located at the two ends of the length direction of the cover 2; and it is preferred that the plug-in connector 22 has a certain elastic deformation capacity and can be bent and deformed within a certain degree.

[0045] The housing 1 is provided with two corresponding plug-in slots 15 for inserting the plug-in member 22 and two snap-in slots 16 for snap-in of the snap-in portion 23. The two plug-in slots 15 are respectively located at the two ends of the length direction of the housing 1, the plug-in slots 15 are opened along the height direction of the housing 1, and an opening is formed at the top of the housing 1; the two snap-in slots 16 are respectively located at the two ends of the length direction of the housing 1, and are located on the side of the adjacent plug-in slot 15 away from the installation space 11; the snap-in slot 16 is opened along the length direction of the housing 1, one end of the snap-in slot 16 is communicated with the bottom of the adjacent plug-in slot 15, and the other end of the snap-in slot 16 passes through one side of the length direction of the housing 1 to form an opening.

[0046] When the end of the connector 22 enters the corresponding plug-in slot 15, the corresponding snap-in portion 23 contacts and abuts against the side wall of the plug-in slot 15 away from the installation space 11, which can drive the end of the connector 22 to bend and deform toward the center of the cover body 2, so as to facilitate the subsequent insertion of the connector 22 into the plug-in slot 15; when the connector 22 is inserted into the plug-in slot 15 so that the cover body 2 and the shell 1 are completely in contact and abut against each other, the corresponding snap-in portion 23 can enter the corresponding snap-in slot 16, so that the connector 22 elastically deforms and recovers, so that the connector 22 contacts and abuts against the side wall of the plug-in slot 15 away from the installation space 11, and the snap-in portion 23 in the snap-in slot 16 can limit the separation of the cover body 2 and the shell 1. In this embodiment, the clamping portion 23 preferably has a wedge-shaped structure at both ends along the extension direction of the corresponding plug-in component 22, which facilitates the end of the plug-in component 22 to enter the corresponding plug-in slot 15, and at the same time facilitates the control of the movement of the cover body 2 to make the plug-in component 22 leave the corresponding plug-in slot 15 after the clamping portion 23 leaves the clamping slot 16.

[0047] Furthermore, after the cover body 2 is connected to the shell 1, in order to facilitate the user to drive the clamping part 23 to leave the corresponding clamping groove 16, thereby facilitating the user to control the plug-in component 22 to leave the corresponding plug-in groove 15 to complete the disassembly of the cover body 2, preferably two sliders 5 are correspondingly installed on the shell 1.

[0048] The two sliders 5 correspond to the two snap-in grooves 16 one by one, and the sliders 5 are installed in the corresponding snap-in grooves 16; the sliders 5 can slide in the snap-in grooves 16 along the opening direction of the snap-in grooves 16 relative to the shell 1, and there is a limit in the sliding process of the sliders 5 relative to the shell 1; when the sliders 5 slide to the extreme position in the direction away from the installation space 11, at this time, the side surface of the slider 5 away from the installation space 11 is flush with the outer surface of the shell 1, and at this time, the space of the snap-in groove 16 on the side of the slider 5 close to the installation space 11 can meet the snap-in requirements of the snap-in portion 23; when the slider 5 slides to the extreme position in the direction close to the installation space 11, at this time, the slider 5 can contact and resist the snap-in portion 23 inserted into the snap-in groove 16 and drive the snap-in portion 23 to leave the snap-in groove 16, so that the user can control the movement of the cover body 2 to make the connector 22 leave the plug-in groove 15.

[0049] Furthermore, in order to keep the surface of the set-top box as flat as possible during use and to keep the engaging groove 16 as close as possible to the engaging state of the engaging portion 23 , a plurality of second elastic members 6 are preferably installed between the slider 5 and the housing 1 .

[0050] The two ends of the second elastic member 6 are respectively fixedly connected to the slider 5 and the housing 1, and have a tendency to drive the slider 5 to slide to the limit position in a direction away from the installation space 11. In this embodiment, the second elastic member 6 is preferably a compression spring, and preferably a plurality of second elastic members 6 are respectively distributed above and below the corresponding slider 5.

[0051] Furthermore, in order to facilitate the user to control the sliding of the slider 5 to drive the snap-on portion 23 to leave the snap-on slot 16 and then control the connector 22 to leave the plug-in slot 15 to achieve separation of the cover body 2 and the shell 1, the slider 5 preferably has a contact surface 51 on the side close to the installation space 11 for contacting the snap-on portion 23 and helping the connector 22 to leave the plug-in slot 15.

[0052] The contact surface 51 is an inclined surface relative to the sliding direction of the slider 5, and the end of the contact surface 51 close to the installation space 11 is an inclined lower end. At this time, when the slider 5 slides toward the direction close to the installation space 11 until the contact surface 51 contacts and abuts against the clamping portion 23, the slider 5 continues to slide and exerts a force on the clamping portion 23 through the contact surface 51 to drive the clamping portion 23 to leave the clamping groove 16 and release the clamping fit with the clamping groove 16; after the clamping portion 23 leaves the clamping groove 16, the slider 5 continues to slide and exerts a force on the clamping portion 23 through the inclined design of the contact surface 51 to drive the clamping member to leave the clamping groove 16.

[0053] The implementation principle of a digital network set-top box without metal fasteners in the embodiment of the present application is as follows: When installing the set-top box, firstly, the plurality of limiting members 14 are all rotated in the direction away from the center of the installation space 11, so that the matching groove 141 of the limiting member 14 is released from the top of the corresponding positioning member 13, and then the circuit board 3 is respectively engaged with the plurality of positioning members 13 through its own plurality of positioning grooves 31, and then the plurality of limiting members 14 are all rotated in the direction close to the center of the installation space 11, so that the limiting member 14 contacts the circuit board 3 and has a limiting effect on the circuit board 3; then, the cover body 2 is installed on the shell body 1, so that the plurality of expansion members 21 are respectively inserted into the plurality of expansion grooves 131, so as to strengthen the positioning effect of the positioning member 13 on the circuit board 3 and improve the stability of the limiting effect of the limiting member 14 on the circuit board 3; at the same time, the plug-in member 22 is inserted into the plug-in groove 15 so that the clamping portion 23 is clamped into the clamping groove 16, and the installation of the set-top box is completed; When the cover 2 and the shell 1 need to be removed, the slider 5 is controlled to slide toward the installation space 11, so that the engaging portion 23 can be first driven to leave the engaging groove 16, and then the plug-in component 22 can be driven to leave the plug-in groove 15, thereby releasing the connection between the cover 2 and the shell 1.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A digital network set-top box without metal fasteners, characterized in that: Comprising a housing (1), a cover (2) and a circuit board (3); The housing (1) has an installation space (11) inside for installing the circuit board (3), and the installation space (11) penetrates the top of the housing (1) to form an opening; the cover (2) is detachably connected to the housing (1), and the cover (2) is capable of covering the opening of the installation space (11); The housing (1) has a plurality of support platforms (12) at the bottom of the installation space (11) for supporting the circuit board (3); when the circuit board (3) contacts and abuts against the support platforms (12), the circuit board (3) is located in the installation space (11); The housing (1) has a plurality of positioning members (13) at the edge of the installation space (11); the edge of the circuit board (3) is correspondingly provided with a plurality of positioning grooves (31) for the positioning members (13) to be inserted into; and a plurality of the positioning members (13) can be inserted into a plurality of the positioning grooves (31) at the same time; A plurality of elastic plug-in components (22) extend outward from the cover body (2), and a plurality of corresponding plug-in slots (15) are provided on the shell (1) for the plug-in components (22) to be inserted into; one end of the plug-in component (22) away from the cover body (2) has a snap-in portion (23), and the shell (1) has a snap-in slot (16) on one side of the snap-in slot (15) for the snap-in portion (23) to be snapped into.

2. A digital network set-top box without metal fasteners according to claim 1, characterized in that: The positioning member (13) is elastic, and the positioning member (13) and the positioning groove (31) are interference fit.

3. A digital network set-top box without metal fasteners according to claim 2, characterized in that: A plurality of expansion members (21) are provided on the cover body (2), and the plurality of expansion members (21) correspond one-to-one to the plurality of positioning members (13); The positioning member (13) is provided with an expansion slot (131) for inserting the expansion member (21); after the cover body (2) is connected to the shell body (1), the expansion member (21) is inserted into the corresponding expansion slot (131), and both sides of the expansion member (21) close to the expansion slot (131) expand outwards.

4. A digital network set-top box without metal fasteners according to claim 3, characterized in that: A limiting member (14) is provided on the positioning member (13); The limiting member (14) is rotatably connected to the positioning member (13), and the rotation axis of the limiting member (14) is perpendicular to the direction in which the expansion member (21) is inserted into the expansion groove (131); the limiting member (14) is provided with a matching groove (141) for the positioning member (13) to pass through, and the positioning member (13) and the matching groove (141) are interference-fitted; When the limiting member (14) is rotated to an extreme position in a direction close to the expansion slot (131), the limiting member (14) can contact and abut against the top of the circuit board (3).

5. A digital network set-top box without metal fasteners according to claim 4, characterized in that: A first elastic member (4) is connected between the limiting member (14) and the positioning member (13), and the first elastic member (4) has a tendency to drive the limiting member (14) to rotate in a direction close to the expansion slot (131) to an extreme position.

6. A digital network set-top box without metal fasteners according to claim 5, characterized in that: After the limiting member (14) rotates in a direction away from the expansion slot (131) until the positioning member (13) leaves the matching slot (141), the limiting member (14) can maintain contact and abutment with the positioning member (13) under the action of the first elastic member (4).

7. A digital network set-top box without metal fasteners according to claim 1, characterized in that: The plug-in slot (15) is located inside the peripheral structure of the shell (1), one end of the clamping slot (16) is in communication with the bottom of the plug-in slot (15), and the other end of the clamping slot (16) penetrates the peripheral surface of the shell (1) to form an opening.

8. A digital network set-top box without metal fasteners according to claim 7, characterized in that: The housing (1) is further provided with a plurality of slide blocks (5), and the plurality of slide blocks (5) correspond one-to-one to the plurality of clamping grooves (16); The slider (5) is located in the clamping groove (16) and is capable of sliding along the clamping groove (16); when the slider (5) slides to an extreme position in a direction away from the installation space (11), the clamping portion (23) is capable of being clamped into the clamping groove (16); when the slider (5) slides to an extreme position in a direction close to the installation space (11), the slider (5) is capable of driving the clamping portion (23) to leave the clamping groove (16).

9. A digital network set-top box without metal fasteners according to claim 8, characterized in that: A plurality of second elastic members (6) are connected between the slider (5) and the housing (1), and the second elastic members (6) have a tendency to drive the slider (5) to slide to an extreme position in a direction away from the installation space (11).

10. A digital network set-top box without metal fasteners according to claim 8, characterized in that: The sliding block (5) has a contact surface (51) on one side close to the installation space (11) for contacting the clamping portion (23); the contact surface (51) is an inclined surface, and one end of the contact surface (51) close to the installation space (11) is an inclined lower end.

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