Circuit board charging and discharging protection board

Abstract

The utility model relates to a circuit board charging and discharging protection board, which comprises a heat dissipation board and a main control board, the main control board is provided with an installation assembly used for limiting the relative position between the heat dissipation board and the main control board, the heat dissipation board is provided with a heat dissipation assembly, the heat dissipation assembly comprises a heat dissipation fin plate and a heat dissipation fan, and the heat dissipation fin plate is provided with a heat dissipation groove. The heat dissipation fin plate is detachably connected to the heat dissipation plate, a heat dissipation cavity, an installation opening, an air inlet and an air outlet are formed in the heat dissipation fin plate, the air inlet is formed in one end of the heat dissipation fin plate, the air outlet is formed in the other end of the heat dissipation fin plate, the heat dissipation fan is installed at the installation opening, and the heat dissipation fin plate is detachably connected to the heat dissipation plate. The surface of the heat dissipation fan is flush with the surfaces of the heat dissipation fin plates, and the heat dissipation fan is a turbine fan. The circuit board charging and discharging protection board has the effect of improving the practicability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of circuit board protection plates, in particular to a circuit board charging and discharging protection plate. BACKGROUND

[0002] The circuit board protection plate is a circuit control device for providing protection for overcharging, overdischarging and temperature of a circuit board provided with charging and discharging elements, controlling charging and discharging of the circuit board and monitoring the state of the circuit board, and is mainly used for ensuring the safety and performance of a battery pack on the circuit board.

[0003] A Chinese patent with the publication number CN214429286U discloses an active heat dissipation protection plate, which comprises a protection plate, an outer cover, a fan and a heat sink. At least one side of the protection plate is in thermal contact with the heat sink. The outer cover is arranged outside the heat sink and forms a heat dissipation air duct with the heat sink. The outer cover is provided with an air inlet and an air outlet. The fan is arranged in the heat dissipation air duct and located between the air inlet and the air outlet. The fan is electrically connected with the protection plate. The active heat dissipation protection plate has the advantages of good heat dissipation effect, improved performance and prolonged service life.

[0004] The above-mentioned technology uses the cooperation of the fan and the heat sink to dissipate heat from the circuit board. However, the fan in the above-mentioned technology is a common fan, and the airflow direction of the fan is parallel to the axial direction of the fan. Therefore, an additional fan mounting space and a ventilation space between the fan and the heat sink need to be set. In the two embodiments of the above-mentioned patent, the mounting position of the fan is changed, and the mounting space of the fan is adjusted accordingly. However, these changes do not fundamentally change the design and function of the protection plate, resulting in a large overall size of the protection plate, which increases the installation space of the protection plate on the application device, thereby affecting the overall component layout of the device and reducing the practicability of the circuit board charging and discharging protection plate. Practical new type content

[0005] In order to improve the practicability of the circuit board charging and discharging protection plate, the application provides a circuit board charging and discharging protection plate.

[0006] The circuit board charging and discharging protection plate provided by the application adopts the following technical scheme:

[0007] The application discloses a circuit board charging and discharging protection plate which comprises a heat dissipation plate and a main control plate, wherein the main control plate is provided with a mounting assembly for limiting the relative position between the heat dissipation plate and the main control plate, and the heat dissipation plate is provided with a heat dissipation assembly comprising a heat dissipation fin plate and a heat dissipation fan; the heat dissipation fin plate is detachably connected to the heat dissipation plate; the heat dissipation fin plate is provided with a heat dissipation cavity, a mounting hole, an air inlet and an air outlet; the air inlet is arranged at one end of the heat dissipation fin plate; the air outlet is arranged at the other end of the heat dissipation fin plate; the heat dissipation fan is mounted at the mounting hole; the surface of the heat dissipation fan is flush with the surface of the heat dissipation fin plate; and the heat dissipation fan is a turbine fan.

[0008] By adopting the above technical scheme, when the heat dissipation plate is used for heat dissipation, the heat dissipation fan is started to form a negative pressure in the heat dissipation cavity, external air enters the heat dissipation cavity from the air inlet, and the heat on the surface of the heat dissipation fin plate is discharged from the heat dissipation fin plate through the air outlet, so that the heat dissipation effect of the heat dissipation plate is realized. Since the heat dissipation fan is a turbine fan, the air direction of the heat dissipation fan is perpendicular to the main shaft direction of the heat dissipation fan, so that the heat dissipation fan can be mounted in the heat dissipation fin plate. Compared with the prior art, the installation space of the heat dissipation fan and the ventilation space between the heat dissipation fan and the heat dissipation plate do not need to be reserved additionally. Compared with the prior art, the overall size of the circuit board protection plate is reduced, the installation space of the circuit board charging and discharging protection plate on the application equipment is also reduced, the overall component layout on the application equipment is more reasonable, and the practicability of the circuit board charging and discharging protection plate is improved.

[0009] Optionally, the mounting assembly comprises a fixing column, a supporting cylinder, a plug-in column, a locking block and a limiting piece; the fixing column comprises a supporting part and a connecting part; the supporting part penetrates through the main control plate; the connecting part penetrates through the heat dissipation plate; the connecting part is connected with the supporting part; the supporting cylinder is sleeved between the connecting part and the supporting part and located between the heat dissipation plate and the main control plate; the locking block is connected to the end of the plug-in column; the plug-in column is plug-in matched in the connecting part; the connecting part is provided with a sliding groove and a rotating groove at the position corresponding to the locking block; the sliding groove is perpendicular to the rotating groove; when the locking block is locked, the locking block is located in the rotating groove; and the limiting piece is mounted on the supporting part and used for limiting the rotation of the locking block.

[0010] By adopting the above technical scheme, when the heat dissipation plate and the main control plate are mounted, the connecting part penetrates through the heat dissipation plate and the main control plate in sequence; during this period, the supporting cylinder is sleeved on the connecting part; then the plug-in column is inserted into the connecting part and rotated, so that the locking block enters the rotating groove through the sliding groove; finally, the movement of the locking block is limited by the limiting piece, so that the freedom of the plug-in column is limited, and the heat dissipation plate and the main control plate are limited, thereby realizing the mounting of the heat dissipation plate and the main control plate.

[0011] Optionally, the limiting piece is a limiting block, the supporting part is provided with a locking groove near the end of the connecting part, the limiting piece is slidingly fitted in the locking groove, the limiting piece is provided with an abutting inclined surface, the reference direction is from the locking groove to the rotating groove, the thickness of the limiting piece gradually decreases, the locking groove is provided with an ejection spring between the limiting piece and the bottom wall of the locking groove, and the locking block is provided with a connecting stripe near the side wall of the supporting part.

[0012] By adopting the above technical scheme, when the locking block is limited, the rotating locking block touches the abutting inclined surface, the limiting piece enters the locking groove, the ejection spring is compressed, and the locking block cannot rotate until the limiting piece moves reversely and abuts against the connecting stripe, thereby realizing the effect of limiting the rotation of the locking block.

[0013] Optionally, the insertion column is connected with an operation block at the end away from the locking block, and the operation block and the insertion column are circularly arc transitionally arranged.

[0014] By adopting the above technical scheme, the worker can smoothly control the movement and rotation of the insertion column by rotating the operation block, and the operability of the insertion column is improved.

[0015] Optionally, the heat dissipation plate is provided with a plurality of mounting seats, the heat dissipation fin plate is provided with a plurality of stepped holes, the stepped holes are provided with locking bolts, and the locking bolts pass through the mounting seats and are threadedly matched with the mounting seats.

[0016] By adopting the above technical scheme, when the heat dissipation fin plate is mounted, the heat dissipation fin plate is placed on the heat dissipation plate, then the locking bolts pass through the stepped holes and are threadedly matched with the mounting seats, and the mounting of the heat dissipation fin plate is realized.

[0017] Optionally, the main control board is sleeved with a shell, the inner bottom wall of the shell is provided with a mounting piece at a position corresponding to the supporting part, the mounting piece is used for limiting the supporting part, the heat dissipation fin plate is sleeved with a shell cover, the shell cover is provided with a ventilation hole at a position corresponding to the air inlet and the air outlet, and the shell cover is provided with a connecting piece for locking the shell cover on the shell.

[0018] By adopting the above technical scheme, the heat dissipation fin plate, the heat dissipation plate and the main control board are covered by the cooperation of the shell and the shell cover, and the effect of protecting and dustproofing the heat dissipation fin plate, the heat dissipation plate and the main control board is achieved.

[0019] Optionally, the mounting piece is a mounting column, the supporting part is connected with a connecting column, the connecting column is inserted into the mounting piece and is threadedly matched with the mounting piece.

[0020] By adopting the technical scheme, when the supporting part is installed, the connecting column is inserted into the mounting piece and rotated, so that the connecting column is screwed in the mounting piece, thereby limiting the supporting part and achieving installation of the supporting part.

[0021] Optionally, the connecting piece is a clamping block, an inclined surface is arranged at the end of the connecting piece, and a clamping groove is formed on the shell in an L shape, so that the connecting piece is clamped in the clamping groove during installation.

[0022] By adopting the technical scheme, when the shell cover and the shell are limited, the connecting piece is inserted into the clamping groove, in this process, the inclined surface is deformed by abutting against the edge of the clamping groove, until the shell cover abuts against the shell, the connecting piece restores, and is clamped in the clamping groove, thereby achieving installation of the shell cover and the shell.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. When dissipating heat, the heat dissipation fan is started to form a negative pressure in the heat dissipation cavity, and the external wind enters the heat dissipation cavity from the air inlet, and the heat on the surface of the heat dissipation fin is discharged through the air outlet, thereby achieving the heat dissipation effect of the heat dissipation fin. Since the heat dissipation fan is a turbine fan, the direction of the wind is perpendicular to the main shaft direction of the heat dissipation fan, so that the heat dissipation fan can be installed in the heat dissipation fin. Compared with the prior art, the present application does not need to reserve additional installation space for the heat dissipation fan and ventilation space between the heat dissipation fan and the heat dissipation fin, thereby reducing the overall size of the circuit board protection plate. Therefore, the installation space of the circuit board charging and discharging protection plate on the application device is also reduced, the overall component layout of the application device is more reasonable, and the practicability of the circuit board charging and discharging protection plate is improved.

[0025] 2. When installing the heat dissipation plate and the main control plate, the connecting part is sequentially inserted through the heat dissipation plate and the main control plate, the supporting cylinder is sleeved on the connecting part during this period, then the plug-in column is inserted into the connecting part and rotated, the locking block enters the rotating groove through the sliding groove, and finally the locking block is limited by the limiting piece to move, thereby limiting the freedom of the plug-in column to limit the heat dissipation plate and the main control plate, and achieving installation of the heat dissipation plate and the main control plate.

[0026] 3. When limiting the locking block, the rotating locking block touches the abutting inclined surface, so that the limiting piece enters the locking groove, the ejector spring is compressed, and the locking block cannot be rotated until the limiting piece moves reversely and abuts against the connecting stripe, thereby achieving the effect of limiting the rotation of the locking block. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the circuit board charging and discharging protection plate in the embodiment of the present application.

[0028] Figure 2Fig. 1 is a structural schematic diagram of a heat dissipation plate and a main control plate in an embodiment of the present application.

[0029] Figure 3 Fig. 2 is an exploded view of a mounting assembly structure in an embodiment of the present application.

[0030] Figure 4 Fig. 3 is an exploded view of a limiting member structure in an embodiment of the present application.

[0031] Figure 5 Fig. 4 is a structural schematic diagram of a connecting portion in an embodiment of the present application.

[0032] Figure 6 Fig. 5 is an exploded view of a heat dissipation assembly structure in an embodiment of the present application.

[0033] Figure 7 Fig. 6 is a sectional view of a heat dissipation fin plate structure in an embodiment of the present application.

[0034] Figure 8 Fig. 7 is a structural schematic diagram of a fixing column in an embodiment of the present application.

[0035] Figure 9 Fig. 8 is an exploded view of a connecting member structure in an embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS 1, heat dissipation plate; 11, mounting seat; 2, main control plate; 3, mounting assembly; 31, fixing column; 311, bearing portion; 3111, connecting column; 312, connecting portion; 3121, sliding groove; 3122, rotating groove; 32, supporting cylinder; 33, plug-in column; 331, operation block; 34, locking block; 341, connecting stripe; 35, limiting member; 351, ejection spring; 4, heat dissipation assembly; 41, heat dissipation fin plate; 411, locking bolt; 412, heat dissipation cavity; 413, mounting port; 414, air inlet; 415, air outlet; 42, heat dissipation fan; 5, shell; 51, mounting member; 52, shell cover; 53, connecting member. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying drawings. Figures 1-9 The present application will be further described in detail.

[0038] The present application discloses a circuit board charge and discharge protection plate. Referring to Figure 1 , Figure 2 and Figure 3The circuit board charging and discharging protection plate comprises a heat dissipation plate 1 and a main control plate 2, and the main control plate 2 is located directly below the heat dissipation plate 1. An installation assembly 3 is arranged on the main control plate 2, and the installation assembly 3 comprises a fixing column 31, a supporting cylinder 32, a plug-in column 33, a locking block 34 and a limiting piece 35. The fixing column 31 comprises a supporting part 311 and a connecting part 312, the supporting part 311 penetrates through the main control plate 2, the connecting part 312 penetrates through the heat dissipation plate 1, and the connecting part 312 is fixedly connected to the supporting part 311.

[0039] With reference to Figure 3 , Figure 4 and Figure 5 , the supporting cylinder 32 is sleeved on the supporting part 311 and the connecting part 312 and located between the heat dissipation plate 1 and the main control plate 2. The locking block 34 is fixedly connected to one end of the plug-in column 33, the plug-in column 33 is inserted into the connecting part 312, the connecting part 312 is provided with a sliding groove 3121 and a rotating groove 3122 at a position corresponding to the locking block 34, the sliding groove 3121 is parallel to the connecting part 312, the rotating groove 3122 is perpendicular to the sliding groove 3121, and the sliding groove 3121 is in communication with the rotating groove 3122. The other end of the plug-in column 33 is integrally formed with an operation block 331, and the operation block 331 is used for improving the operability of the plug-in column 33.

[0040] With reference to Figure 4 , the limiting piece 35 is a limiting block, the end of the supporting part 311 is provided with a locking groove, the limiting piece 35 is slidingly fitted in the limiting piece 35, the limiting piece 35 is provided with an abutting inclined surface, the reference direction is from the bottom wall of the locking groove to the rotating groove 3122, and the thickness of the limiting piece 35 gradually decreases. The locking groove is provided with an ejection spring 351 located between the limiting piece 35 and the bottom wall of the locking groove. A plurality of connection stripes 341 are arranged on the side wall of the locking block 34 close to the supporting part 311.

[0041] During installation, the connecting part 312 penetrates through the main control plate 2, the supporting cylinder 32 is sleeved on the connecting part 312, the connecting part 312 penetrates through the heat dissipation plate 1, then the plug-in column 33 is inserted into the connecting part 312 and rotated, the locking block 34 enters the rotating groove 3122 through the sliding groove 3121, in this process, the locking block 34 touches the abutting inclined surface, the limiting piece 35 enters the locking groove, the ejection spring 351 is compressed, until the locking block 34 cannot be rotated, the locking block 34 moves reversely and abuts against the connection stripes 341 to limit the locking block 34, thereby limiting the freedom degree of the plug-in column 33, and the installation of the main control plate 2 and the heat dissipation plate 1 is realized.

[0042] With reference to Figure 6The heat dissipation plate 1 is provided with a heat dissipation assembly 4, and the heat dissipation assembly 4 comprises a heat dissipation fin plate 41 and a heat dissipation fan 42. The heat dissipation fin plate 41 is provided with a plurality of stepped holes, the heat dissipation plate 1 is fixedly connected with a mounting seat 11 at positions corresponding to the stepped holes, and the heat dissipation fin plate 41 is provided with locking bolts 411 in the stepped holes, the locking bolts 411 penetrating through the mounting seat 11 and being in threaded connection with the mounting seat 11.

[0043] With reference to Figure 6 and Figure 7 , the heat dissipation fin plate 41 is provided with a heat dissipation cavity 412, a mounting opening 413, an air inlet 414 and an air outlet 415. The mounting opening 413 is arranged on the surface of the heat dissipation fin plate 41, the air inlet 414 is arranged at one end of the heat dissipation fin plate 41, the air outlet 415 is arranged at the other end of the heat dissipation fin plate 41, and the mounting opening 413, the air inlet 414 and the air outlet 415 are all in communication with the heat dissipation cavity 412. The heat dissipation fan 42 is a turbine fan, the heat dissipation fan 42 is installed at the mounting opening 413 and is flush with the surface of the heat dissipation fin plate 41, and the fan blades of the heat dissipation fan 42 are located in the heat dissipation cavity 412.

[0044] During heat dissipation, the heat dissipation fan 42 is started to form a negative pressure in the heat dissipation cavity 412, external air enters the heat dissipation cavity 412 through the air inlet 414, and the heat on the surface of the heat dissipation fin plate 41 is discharged through the air outlet 415, so that the heat dissipation fin plate 41 is cooled.

[0045] With reference to Figure 1 , Figure 8 and Figure 9 , in order to protect the heat dissipation fin plate 41, the heat dissipation plate 1 and the main control plate 2, a shell 5 is sleeved on the main control plate 2, the inner bottom wall of the shell 5 is fixedly connected with a mounting piece 51 at a position corresponding to the supporting portion 311, the mounting piece 51 is a mounting column, the supporting portion 311 is fixedly connected with a connecting column 3111, the connecting column 3111 enters the mounting piece 51 and is in threaded connection with the mounting piece 51. A shell cover 52 is sleeved on the heat dissipation fin plate 41, and the shell cover 52 is provided with ventilation openings at positions corresponding to the air inlet 414 and the air outlet 415. The shell cover 52 is provided with a plurality of connecting pieces 53, the connecting pieces 53 are clamping blocks, and the connecting pieces 53 are provided with guide inclined surfaces. The shell 5 is provided with clamping grooves at positions corresponding to the connecting pieces 53, the clamping grooves are L-shaped, and the connecting pieces 53 are clamped and matched in the clamping grooves.

[0046] During installation, the connecting column 3111 on the supporting portion 311 is threaded into the mounting piece 51 in advance, then the shell cover 52 is sleeved on the heat dissipation fin plate 41, in this process, the guide inclined surface abuts against the clamping groove, the connecting piece 53 is deformed, until the shell cover 52 abuts against the shell 5, the connecting piece 53 returns to normal, and is clamped and matched with the clamping groove, thereby achieving the installation of the shell 5 and the shell cover 52.

[0047] The implementation principle of the circuit board charging and discharging protection plate according to the embodiment of the application is as follows: when being installed, the connecting column 3111 on the supporting part 311 is screwed into the mounting part 51, then the main control board 2, the supporting cylinder 32 and the heat dissipation plate 1 are sequentially sleeved on the connecting part 312, then the plug-in column 33 is inserted into the connecting part 312 and is rotated, so that the locking block 34 enters the rotating groove 3122, in this process, the locking block 34 touches the inclined surface, so that the limiting part 35 enters the locking groove, the compression spring 351 is compressed, and until the locking block 34 cannot be rotated, the limiting part 35 moves reversely and abuts against the connecting stripe 341, so that the heat dissipation plate 1 and the main control board 2 are installed, then the shell cover 52 is sleeved on the heat dissipation fin plate 41, and the connecting part 53 is inserted into the clamping groove, thereby achieving the installation of the circuit board charging and discharging protection plate.

[0048] Since the heat dissipation fan 42 is a turbine fan, the wind direction is perpendicular to the main shaft direction of the heat dissipation fan 42, so that the heat dissipation fan 42 can be installed in the heat dissipation fin plate 41. Compared with the prior art, the application does not need to additionally reserve the installation space of the heat dissipation fan 42 and the ventilation space between the heat dissipation fan 42 and the heat dissipation fin plate 41, thereby reducing the overall size of the circuit board protection plate, so that the installation space of the circuit board charging and discharging protection plate on the application device is also reduced, the overall component layout on the application device is more reasonable, and the practicability of the circuit board charging and discharging protection plate is improved.

[0049] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A circuit board charge-discharge protection board comprising a heat dissipation board (1) and a main control board (2), characterized in that: The main control board (2) is provided with a mounting assembly (3) for limiting the relative position between the heat dissipation plate (1) and the main control board (2), the heat dissipation plate (1) is provided with a heat dissipation assembly (4), the heat dissipation assembly (4) comprises a heat dissipation fin plate (41) and a heat dissipation fan (42), the heat dissipation fin plate (41) is detachably connected to the heat dissipation plate (1), the heat dissipation fin plate (41) is provided with a heat dissipation cavity (412), a mounting port (413), an air inlet (414) and an air outlet (415), the air inlet (414) is arranged at one end of the heat dissipation fin plate (41), the air outlet (415) is arranged at the other end of the heat dissipation fin plate (41), the heat dissipation fan (42) is mounted at the mounting port (413), the surface of the heat dissipation fan (42) is flush with the surface of the heat dissipation fin plate (41), and the heat dissipation fan (42) is a turbine fan.

2. The charge and discharge protection board for a circuit board according to claim 1, characterized by: The mounting assembly (3) comprises a fixed column (31), a supporting cylinder (32), a plug-in column (33), a locking block (34) and a limiting piece (35), the fixed column (31) comprises a supporting part (311) and a connecting part (312), the supporting part (311) penetrates through the main control board (2), the connecting part (312) penetrates through the heat dissipation plate (1), the connecting part (312) is connected with the supporting part (311), the supporting cylinder (32) is sleeved between the connecting part (312) and the supporting part (311) and located between the heat dissipation plate (1) and the main control board (2), the locking block (34) is connected to the end of the plug-in column (33), the plug-in column (33) is plug-in matched in the connecting part (312), the connecting part (312) is provided with a sliding groove (3121) and a rotating groove (3122) at the position corresponding to the locking block (34), the sliding groove (3121) is perpendicular to the rotating groove (3122), when locked, the locking block (34) is located in the rotating groove (3122), and the limiting piece (35) is mounted on the supporting part (311) and used for limiting the rotation of the locking block (34).

3. The charge and discharge protection board for a circuit board according to claim 2, characterized by: The limiting piece (35) is a limiting block, the end of the supporting part (311) close to the connecting part (312) is provided with a locking groove, the limiting piece (35) is slidingly matched in the locking groove, the limiting piece (35) is provided with an abutting inclined surface, the reference direction is from the locking groove to the rotating groove (3122), the thickness of the limiting piece (35) gradually decreases, the locking groove is provided with an ejection spring (351) located between the limiting piece (35) and the bottom wall of the locking groove, and the locking block (34) is provided with a connecting stripe (341) on the side wall close to the supporting part (311).

4. The charge and discharge protection board for a circuit board according to claim 2, characterized by: An operating block (331) is connected to the end of the insertion column (33) away from the locking block (34), and the operating block (331) and the insertion column (33) are circularly arc transitioned.

5. The charge and discharge protection board for a circuit board according to claim 1, characterized by: The heat dissipation plate (1) is provided with a plurality of mounting seats (11), the heat dissipation fin plate (41) is provided with a plurality of stepped holes, the stepped holes are provided with locking bolts (411), the locking bolts (411) pass through the mounting seats (11) and are threadedly connected with the mounting seats (11).

6. The charge and discharge protection board for a circuit board according to claim 2, characterized by: The main control plate (2) is provided with a shell (5), the inner bottom wall of the shell (5) is provided with a mounting piece (51) corresponding to the position of the supporting part (311), the mounting piece (51) is used for limiting the supporting part (311), the heat dissipation fin plate (41) is provided with a shell cover (52), the shell cover (52) is provided with air vents corresponding to the positions of the air inlet (414) and the air outlet (415), and the shell cover (52) is provided with a connecting piece (53) for locking the shell cover (52) on the shell (5).

7. The charge and discharge protection board for a circuit board according to claim 6, characterized by: The mounting piece (51) is a mounting column, the supporting part (311) is connected with a connecting column (3111), the connecting column (3111) is inserted into the mounting piece (51) and is threadedly connected with the mounting piece (51).

8. The charge and discharge protection board for a circuit board according to claim 6, characterized by: The connecting piece (53) is a clamping block, the end of the connecting piece (53) is provided with a guide inclined surface, the shell (5) is provided with a clamping groove, the clamping groove is L-shaped, and when the connecting piece (53) is clamped and matched in the clamping groove during installation.

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