Dustproof filter easy to assemble

Abstract

The invention discloses an easy-to-assemble dustproof filter, and relates to the technical field of filters, and the easy-to-assemble dustproof filter is characterized in that a heat dissipation hole is formed in the top end of a shell in a penetrating manner, an annular groove is formed in the top of the shell, mounting grooves are formed in the two sides of the top of the shell, and a bottom shell is connected to the bottom end of the shell in an abutting manner; the inner wall of the ring is fixedly connected with the top of the dustproof cylinder, the ring is connected with the inner wall of the ring groove in an abutting mode, the two sides of the ring are fixedly connected with mounting plates respectively, the top end of the ring is higher than the top end of the shell, and the mounting plates are connected with the inner wall of the mounting groove in an abutting mode. And the mounting plate enables the dustproof cylinder to slide along the inner wall of the heat dissipation hole through the circular ring, so that the dustproof cylinder is taken down from the shell, and vibration is prevented from being transmitted to an electronic element of the filter when the dustproof cylinder is cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to an easy-to-assemble dust-proof filter. Background Art

[0002] A filter is a device or circuit used for signal processing. It can selectively pass or suppress signal components within a specific frequency range, thereby removing noise, interference and clutter, and improving the quality and stability of the signal.

[0003] In the prior art, the electronic components of the filter are installed in a housing, and the housing is fixed to a connecting rod on the housing by bolts and threads. A dustproof net is fixed in the heat dissipation holes opened in the housing, thereby achieving the effect of dustproof and heat dissipation for the filter.

[0004] However, when the filter is used for a long time, dust will accumulate on the surface of the dust net, and staff will be required to clean the dust on the dust net. Staff need to be careful and use force during the cleaning process to avoid damage to electronic components caused by the vibration of the filter due to improper operation, which will make cleaning the dust on the filter time-consuming and laborious. Summary of the invention

[0005] The purpose of the present invention is to provide an easy-to-assemble dust-proof filter to solve the technical problem in the prior art that when the filter is used for a long time, dust will accumulate on the surface of the dust-proof net, requiring staff to clean the dust on the dust-proof net. The staff needs to be careful and use force during the cleaning process to avoid damage to electronic components caused by vibrations generated by the filter due to improper operation, thereby causing time-consuming and labor-intensive technical problems in cleaning the dust from the filter.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] An easy-to-assemble dust-proof filter, comprising:

[0008] The outer shell has a heat dissipation hole formed through the top of the outer shell, a circular groove formed on the top of the outer shell, mounting grooves formed on both sides of the top of the outer shell, and a bottom shell formed on the bottom end of the outer shell;

[0009] The dustproof cylinder is cylindrical in shape, the dustproof cylinder is slidably connected to the inner wall of the heat dissipation hole, and a plurality of dustproof holes are opened around the periphery and bottom of the dustproof cylinder around the axis;

[0010] The circular ring has an inner wall fixedly connected to the top of the dustproof cylinder, the circular ring is butted against the inner wall of the circular ring groove, mounting plates are fixedly connected on both sides of the circular ring, the top of the circular ring is higher than the top of the shell, and the mounting plates are butted against the inner wall of the mounting groove.

[0011] As a further solution of the present invention: a protective shell is provided on the top of the dustproof cylinder, and a plurality of support columns are provided between the circular ring and the protective shell. The plurality of support columns are equidistantly distributed around the axis of the circular ring and are fixedly connected to the circular ring and the protective shell at the upper and lower ends respectively.

[0012] As a further solution of the present invention: the cross section of the protective shell is in the shape of a truncated cone, the diameter of the protective shell is larger than the diameter of the circular ring, and a plurality of protective holes are formed through the protective shell around the axis.

[0013] As a further solution of the present invention: a connecting hole is formed through the side end of the mounting plate, a circular tube-shaped protective tube is fixedly connected to the bottom end of the mounting plate, a connecting rod is slidably connected to the inner wall of the connecting hole, the connecting rod is arranged in the protective tube, a limiting assembly is fixedly connected to the bottom end of the connecting rod, a control panel is fixedly connected to the top end of the connecting rod, bases are respectively fixedly connected to both ends of the outer shell, two groups of bases are respectively abutted and connected to two sides of the outer shell, the limiting assembly is abutted and connected to the inner wall of the base, and the bottom end of the protective tube is abutted and connected to the outer shell.

[0014] As a further solution of the present invention: a tension spring is sleeved and connected to the outer wall of the connecting rod, and the upper and lower ends of the tension spring are respectively fixedly connected to the mounting plate and the limit assembly.

[0015] As a further solution of the present invention: the limit assembly includes: a limit column and a limit plate, the top of the limit column is fixedly connected to the connecting rod, the limit plate is provided with two groups and are respectively fixedly connected to the two sides of the limit column, the top of the base is provided with an entry groove, the inside of the base is provided with a rotation groove, and the two sides of the inner wall of the base are respectively provided with limit grooves, the limit groove is located between the entry groove and the rotation groove and is respectively interconnected with the entry groove and the rotation groove, the inner wall of the limit groove is abutted against the limit plate, the inner wall of the rotation groove is rotationally connected to the limit plate, and the inner wall of the entry groove is slidingly connected to the limit column and the limit plate respectively.

[0016] As a further solution of the present invention: the bottom end of the limit column is connected to a supporting plate, a storage groove is opened at the bottom of the base, the storage groove is located at the bottom of the rotating groove, a supporting spring is arranged between the inner wall of the storage groove and the supporting plate, the inner diameter of the storage groove is larger than the diameter of the supporting plate, and the upper and lower ends of the supporting spring are respectively fixedly connected to the supporting plate and the inner wall of the storage groove.

[0017] As a further solution of the present invention: a positioning groove is opened along the outer edge of the bottom of the shell, and a sealing gasket is fixedly connected to the inner wall of the positioning groove. The bottom end of the sealing gasket is abutted and connected with a positioning plate, the positioning plate is slidably connected to the inner wall of the positioning groove, and the bottom end of the positioning plate is fixedly connected to the bottom shell.

[0018] As a further solution of the present invention: a positioning seat in a hemispherical shape is fixedly connected to the top end of the positioning plate along the direction of the outer edge, and the positioning seat is abutted and connected to the positioning groove.

[0019] Beneficial effects of the present invention:

[0020] 1. Install the electronic components of the filter on the casing. When the filter is running to dissipate heat, the heat is dissipated through the heat dissipation holes. The dustproof tube can block the dust from the heat dissipation holes, and the heat flows out through the dustproof holes opened in the dustproof tube. The dustproof tube blocks the dust. When dust accumulates on the surface of the dustproof tube, the shape of the dustproof tube can collect the dust. Dust begins to accumulate on the inner wall of the dustproof tube. Since dustproof holes are opened around the dustproof tube, the accumulated dust will not affect the heat from flowing out through the dustproof holes, thereby ensuring that the dustproof tube blocks the dust without affecting the heat dissipation of the filter, increasing the working time of the dustproof tube to block the dust, and avoiding the need for staff to constantly clean the dust on the surface of the dustproof tube.

[0021] 2. When the dustproof cylinder needs to be cleaned, the staff controls the mounting plate to move vertically upward, and the mounting plate slides the dustproof cylinder along the inner wall of the heat dissipation hole through the circular ring, thereby removing the dustproof cylinder from the outer shell to avoid the vibration being transmitted to the electronic components of the filter when the dustproof cylinder is cleaned, thereby protecting the electronic components. The mounting plate abuts against the inner wall of the mounting groove to serve as a limiting support for the circular ring and the dustproof cylinder, and the circular ring abuts against the inner wall of the circular ring groove to seal the dustproof cylinder and the heat dissipation hole to avoid dust from entering the outer shell through the gap between the dustproof cylinder and the heat dissipation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a top view of the overall structure of the present invention;

[0025] Figure 3 It is the AA cross-sectional view of the overall structure of the present invention;

[0026] Figure 4 It is a cross-sectional view of the overall structure BB of the present invention;

[0027] Figure 5 For the present invention Figure 3 A schematic diagram of the structure at A;

[0028] Figure 6 It is a schematic diagram of the shell structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the base structure of the present invention;

[0030] Figure 8 It is a schematic diagram of the protective shell structure of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the limiting component of the present invention.

[0032] In the figure: 1. outer shell; 2. bottom shell; 3. circular ring; 4. supporting column; 5. protective shell; 6. protective hole; 7. mounting plate; 8. control board; 9. protective tube; 10. base; 11. dustproof cylinder; 12. dustproof hole; 13. connecting hole; 14. connecting rod; 15. tensioning spring; 16. limiting column; 17. limiting groove; 18. limiting plate; 19. entry groove; 20. rotating groove; 21. supporting plate; 22. supporting spring; 23. storage groove; 24. positioning plate; 25. positioning seat; 26. sealing gasket; 27. positioning groove; 28. circular ring groove; 29. ​​mounting groove; 30. heat dissipation hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0034] like Figure 1-Figure 9 As shown, an easy-to-assemble dust-proof filter comprises: a housing 1, a dust-proof cylinder 11 and a ring 3,

[0035] A heat dissipation hole 30 is opened through the top of the shell 1, a circular groove 28 is opened on the top of the shell 1, and mounting grooves 29 are opened on both sides of the top of the shell 1. The bottom end of the shell 1 is abutted and connected with the bottom shell 2. The dustproof cylinder 11 is cylindrical in shape, and the dustproof cylinder 11 is slidably connected to the inner wall of the heat dissipation hole 30. A plurality of dustproof holes 12 are opened around the dustproof cylinder 11 and the bottom around the axis. The inner wall of the ring 3 is fixedly connected to the top of the dustproof cylinder 11, and the ring 3 is abutted and connected to the inner wall of the circular groove 28. The two sides of the ring 3 are respectively fixedly connected with mounting plates 7. The top of the ring 3 is higher than the top of the shell 1, and the mounting plate 7 is abutted and connected to the inner wall of the mounting groove 29. The electronic components of the filter are installed on the shell 1. When the filter is running to dissipate heat, the heat is dissipated through the heat dissipation holes 30. Heat, wherein the dust-proof tube 11 can block dust from the heat dissipation holes 30, and heat flows out through the dust-proof holes 12 opened in the dust-proof tube 11. The dust-proof tube 11 blocks dust. When dust accumulates on the surface of the dust-proof tube 11, the shape of the dust-proof tube 11 can collect dust. Dust begins to accumulate on the inner wall of the dust-proof tube 11. Since the dust-proof holes 12 are opened around the dust-proof tube 11, the accumulated dust will not affect the heat from flowing out through the dust-proof holes 12, thereby ensuring that the dust-proof tube 11 blocks dust without affecting the heat dissipation of the filter, increasing the working time of the dust-proof tube 11 to block dust, and avoiding the need for staff to constantly clean the dust on the surface of the dust-proof tube 11;

[0036] When the dust tube 11 needs to be cleaned, the staff controls the mounting plate 7 to move vertically upward, and the mounting plate 7 slides the dust tube 11 along the inner wall of the heat dissipation hole 30 through the circular ring 3, so that the dust tube 11 is removed from the outer shell 1 to avoid the vibration being transmitted to the electronic components of the filter when the dust tube 11 is cleaned, thereby protecting the electronic components. The mounting plate 7 is supported by the inner wall of the mounting groove 29 to serve as a limiting support for the circular ring 3 and the dust tube 11. The circular ring 3 is connected by being supported by the inner wall of the circular groove 28 to seal the dust tube 11 and the heat dissipation hole 30, so as to avoid dust from entering the outer shell 1 through the gap between the dust tube 11 and the heat dissipation hole 30.

[0037] In some specific embodiments, a protective shell 5 is provided on the top of the dustproof tube 11, and a plurality of support columns 4 are provided between the ring 3 and the protective shell 5. The plurality of support columns 4 are equidistantly distributed around the axis of the ring 3 and the upper and lower ends are fixedly connected to the ring 3 and the protective shell 5 respectively. In order to prevent debris from falling into the dustproof tube 11 and causing damage to the dustproof tube 11, the protective shell 5 fixed to the top of the ring 3 by the support columns 4 can block the debris.

[0038] In some specific embodiments, the cross-section of the protective shell 5 is in the shape of a truncated cone, the diameter of the protective shell 5 is larger than the diameter of the ring 3, and a number of protective holes 6 are opened around the axis of the protective shell 5. The protective holes 6 opened in the protective shell 5 can ensure that the heat not only flows out from between the ring 3 and the protective shell 5, but also flows out through the protective holes 6, thereby achieving a better heat outflow effect. The shape of the protective shell 5 can ensure that when debris falls on the top of the protective shell 5, the debris slides along the protective shell 5 to avoid the debris blocking the protective holes 6. Among them, the height setting of the ring 3 can prevent debris from passing through the ring 3 and falling into the dustproof tube 11.

[0039] In some specific implementation schemes, a connecting hole 13 is formed through the side end of the mounting plate 7, a protective tube 9 in the shape of a circular tube is fixedly connected to the bottom end of the mounting plate 7, a connecting rod 14 is slidably connected to the inner wall of the connecting hole 13, the connecting rod 14 is arranged in the protective tube 9, a limiting assembly is fixedly connected to the bottom end of the connecting rod 14, a control panel 8 is fixedly connected to the top end of the connecting rod 14, bases 10 are respectively fixedly connected to both ends of the outer shell 1, two groups of bases 10 are respectively abutted against the two sides of the outer shell 1, the limiting assembly is abutted against the inner wall of the base 10, and the bottom end of the protective tube 9 is abutted against the outer shell 1. When the mounting plate 7 and the inner wall of the mounting groove 29 abut against each other, the staff controls the control panel 8 to move downward, and the control panel 8 is moved by the connecting rod 1 The limiting assembly is inserted into the base 10, and then the limiting assembly is rotated to abut against the inner wall of the base 10. When the limiting assembly abuts against the inner wall of the base 10, the control board 8 abuts against the top of the mounting plate 7, thereby achieving the effect of limiting and fixing the mounting plate 7. At the same time, the limiting assembly abuts against the inner wall of the base 10, thereby abutting the outer shell 1 and the bottom shell 2 together, thereby achieving the effect of fixing the outer shell 1 on the bottom shell 2. The staff only needs to operate the control board 8 to achieve the effect of disassembling and assembling the limiting assembly in the base 10, avoiding the time-consuming and laborious phenomenon of removing the outer shell 1 fixed to the bottom shell 2 by bolts. Among them, the protective tube 9 achieves the effect of protecting the connecting rod 14.

[0040] In some specific embodiments, a tension spring 15 is sleeved on the outer wall of the connecting rod 14, and the upper and lower ends of the tension spring 15 are fixedly connected to the mounting plate 7 and the limit assembly respectively. When the limit assembly and the inner wall of the base 10 are in abutment, the tension spring 15 is in a tensioned state, and the elastic tension provided by the base 10 pulls the limit assembly and the inner wall of the base 10 to be in abutment, thereby achieving a state in which the limit assembly is always locked. When the connecting rod 14 rotates, the connecting rod 14 rotates with the limit assembly, and the limit assembly rotates with the tension spring 15.

[0041] In some specific implementation schemes, the limiting assembly includes: a limiting column 16 and a limiting plate 18, the top of the limiting column 16 is fixedly connected to the connecting rod 14, the limiting plate 18 is provided with two groups and is respectively fixedly connected to both sides of the limiting column 16, an entry groove 19 is provided on the top of the base 10, a rotation groove 20 is provided inside the base 10, and limiting grooves 17 are respectively provided on both sides of the inner wall of the base 10, the limiting groove 17 is located between the entry groove 19 and the rotation groove 20 and is respectively communicated with the entry groove 19 and the rotation groove 20, the inner wall of the limiting groove 17 is abutted against the limiting plate 18, the inner wall of the rotation groove 20 is rotationally connected to the limiting plate 18, the inner wall of the entry groove 19 is respectively slidably connected to the limiting column 16 and the limiting plate 18, and when the limiting assembly is running, the limiting column 16 carries the limiting The plate 18 slides vertically downward along the inner wall of the entry groove 19. When the limit column 16 and the limit plate 18 and the inner wall of the rotation groove 20 are in abutment, the limit column 16 rotates the limit plate 18 ninety degrees along the inner wall of the rotation groove 20. Then, the limit column 16 moves vertically upward with the limit plate 18. When the limit plate 18 and the inner wall of the limit groove 17 are in abutment, the limit assembly stops running. At this time, the mounting plate 7 and the control plate 8 are in abutment and connected to the limit assembly through the connecting rod 14. At the same time, the limit plate 18 and the inner wall of the limit groove 17 are in abutment, thereby achieving the effect of fixing the mounting plate 7 at the top end of the outer shell 1 and fixing the bottom shell 2 at the bottom end of the outer shell 1. When the limit assembly is taken out from the base 10, the staff can operate the limit assembly in the reverse steps.

[0042] In some specific embodiments, the bottom end of the limiting column 16 is abutted and connected with a supporting plate 21, and a storage groove 23 is opened at the bottom of the rotating groove 20. A supporting spring 22 is provided between the inner wall of the storage groove 23 and the supporting plate 21. The inner diameter of the storage groove 23 is larger than the diameter of the supporting plate 21, and the upper and lower ends of the supporting spring 22 are fixedly connected to the supporting plate 21 and the inner wall of the storage groove 23 respectively. In order to avoid the lack of limiting effect at the bottom end of the limiting column 16, when the limiting plate 18 and the inner wall of the limiting groove 17 are abutted, the elastic tension increased by the supporting spring 22 is transmitted to the bottom end of the limiting column 16 through the supporting plate 21, thereby ensuring that the limiting plate 18 is always abutted against the inner wall of the limiting groove 17. When the limiting column 16 contacts the rotating groove 20, the limiting column 16 compresses the supporting plate 21 and the supporting spring 22 in the storage groove 23 by abutting against the supporting plate 21, and the storage groove 23 achieves the effect of storing the supporting plate 21 and the supporting spring 22.

[0043] In some specific embodiments, a positioning groove 27 is opened along the outer edge of the bottom of the shell 1, and a sealing gasket 26 is fixedly connected to the inner wall of the positioning groove 27. The bottom end of the sealing gasket 26 is abutted and connected with a positioning plate 24, and the positioning plate 24 is slidably connected to the inner wall of the positioning groove 27. The bottom end of the positioning plate 24 is fixedly connected to the bottom shell 2. When the shell 1 is installed on the bottom shell 2, the positioning plate 24 is slidably connected along the positioning groove 27. The positioning plate 24 abuts against the sealing gasket 26, and the sealing gasket 26 is squeezed and deformed, thereby achieving the function of sealing the gap between the shell 1 and the bottom shell 2.

[0044] In some specific embodiments, a hemispherical positioning seat 25 is fixedly connected to the top of the positioning plate 24 along the direction of the outer edge, and the positioning seat 25 is abutted against the positioning groove 27. In order to further achieve the effect of squeezing and deforming the sealing gasket 26 by the positioning plate 24, the positioning seat 25 fixed by the positioning plate 24 can further squeeze the sealing gasket 26 to fill the positioning groove 27.

[0045] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An easy-to-assemble dust-proof filter, characterized in that: include: A shell (1), wherein a heat dissipation hole (30) is formed through the top of the shell (1), a circular groove (28) is formed on the top of the shell (1), mounting grooves (29) are formed on both sides of the top of the shell (1), and the bottom end of the shell (1) is butted and connected to a bottom shell (2); A dustproof cylinder (11), the dustproof cylinder (11) is in a cylindrical shape, the dustproof cylinder (11) is slidably connected to the inner wall of the heat dissipation hole (30), and a plurality of dustproof holes (12) are opened around the circumference and bottom of the dustproof cylinder (11) around the axis; A circular ring (3), the inner wall of the circular ring (3) is fixedly connected to the top of the dustproof cylinder (11), the circular ring (3) is butted against the inner wall of the circular ring groove (28), and mounting plates (7) are fixedly connected to both sides of the circular ring (3), the top of the circular ring (3) is higher than the top of the housing (1), and the mounting plate (7) is butted against the inner wall of the mounting groove (29).

2. The easy-to-assemble dust-proof filter according to claim 1, characterized in that: A protective shell (5) is provided on the top of the dustproof cylinder (11), and a plurality of support columns (4) are provided between the circular ring (3) and the protective shell (5). The plurality of support columns (4) are equidistantly distributed around the axis of the circular ring (3) and are fixedly connected to the circular ring (3) and the protective shell (5) at their upper and lower ends.

3. The easy-to-assemble dust-proof filter according to claim 2, characterized in that: The cross section of the protective shell (5) is in the shape of a truncated cone, the diameter of the protective shell (5) is greater than the diameter of the circular ring (3), and a plurality of protective holes (6) are formed through the protective shell (5) around the axis.

4. The easy-to-assemble dust-proof filter according to claim 1, characterized in that: A connecting hole (13) is formed through the side end of the mounting plate (7); a protective tube (9) in the shape of a circular tube is fixedly connected to the bottom end of the mounting plate (7); a connecting rod (14) is slidably connected to the inner wall of the connecting hole (13); the connecting rod (14) is arranged in the protective tube (9); a limiting assembly is fixedly connected to the bottom end of the connecting rod (14); a control panel (8) is fixedly connected to the top end of the connecting rod (14); bases (10) are fixedly connected to the two ends of the housing (1); two groups of bases (10) are respectively abutted against the two sides of the housing (1); the limiting assembly is abutted against the inner wall of the base (10); and the bottom end of the protective tube (9) is abutted against the housing (1).

5. The easy-to-assemble dust-proof filter according to claim 4, characterized in that: The outer wall of the connecting rod (14) is sleeved with a tension spring (15), and the upper and lower ends of the tension spring (15) are respectively fixedly connected to the mounting plate (7) and the limit assembly.

6. The easy-to-assemble dust-proof filter according to claim 4, characterized in that: The limiting assembly comprises: a limiting column (16) and a limiting plate (18); the top of the limiting column (16) is fixedly connected to the connecting rod (14); the limiting plate (18) is provided with two groups and is respectively fixedly connected to both sides of the limiting column (16); the top of the base (10) is provided with an entry groove (19); the inside of the base (10) is provided with a rotation groove (20); both sides of the inner wall of the base (10) are provided with limiting grooves (17); the limiting grooves (17) are located between the entry groove (19) and the rotation groove (20) and are respectively communicated with the entry groove (19) and the rotation groove (20); the inner wall of the limiting groove (17) is abutted and connected to the limiting plate (18); the inner wall of the rotation groove (20) is rotationally connected to the limiting plate (18); and the inner wall of the entry groove (19) is respectively slidably connected to the limiting column (16) and the limiting plate (18).

7. The easy-to-assemble dust-proof filter according to claim 6, characterized in that: The bottom end of the limiting column (16) is abutted and connected with a supporting plate (21); a storage groove (23) is provided at the bottom of the base (10); the storage groove (23) is located at the bottom of the rotating groove (20); a supporting spring (22) is provided between the inner wall of the storage groove (23) and the supporting plate (21); the inner diameter of the storage groove (23) is larger than the diameter of the supporting plate (21); and the upper and lower ends of the supporting spring (22) are fixedly connected to the supporting plate (21) and the inner wall of the storage groove (23), respectively.

8. The easy-to-assemble dust-proof filter according to claim 1, characterized in that: A positioning groove (27) is provided at the bottom of the housing (1) along the direction of the outer edge, and a sealing gasket (26) is fixedly connected to the inner wall of the positioning groove (27). A positioning plate (24) is abutted against the bottom end of the sealing gasket (26), and the positioning plate (24) is slidably connected to the inner wall of the positioning groove (27), and the bottom end of the positioning plate (24) is fixedly connected to the bottom housing (2).

9. The easy-to-assemble dust-proof filter according to claim 8, characterized in that: A hemispherical positioning seat (25) is fixedly connected to the top end of the positioning plate (24) along the direction of the outer edge, and the positioning seat (25) is abuttingly connected to the positioning groove (27).

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