Capacitor aluminum shell convenient to assemble

Abstract

The utility model is suitable for the technical field of capacitor shells, and provides a capacitor aluminum shell convenient to assemble, which comprises a bottom plate on which a capacitor inner shell is fixedly arranged, and a protective shell which is arranged on the outer side of the capacitor inner shell and is detachably and fixedly arranged on the outer side of the capacitor inner shell through a connecting mechanism, according to the device, each outer side wall of the capacitor inner shell is oppositely provided with two protruding parts, and the inner side wall of the protective shell is provided with a concave groove capable of accommodating the protruding parts, so that when the protective shell moves downwards from the upper part of the capacitor inner shell and covers the outer side of the capacitor inner shell for assembly, the protruding parts are inserted into the inner sides of the concave grooves; on one hand, guiding and limiting effects during installation of the protective shell can be achieved, and on the other hand, stable assembly between the protective shell and the inner shell of the capacitor is achieved through the fact that the threaded section of the locking bolt penetrates through the through hole and then is in threaded connection with the threaded hole formed in the protruding part.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitor shells, and in particular relates to an aluminum shell of a capacitor which is easy to assemble. Background Art

[0002] Capacitor casings are typically made of aluminum and generally consist of an outer shell, a top cover, and a bottom plate. Various capacitor casings currently available on the market still fail to address the cumbersome, time-consuming, and labor-intensive issue of opening and closing the outer shell, top cover, and bottom plate during assembly and disassembly, thereby reducing user assembly efficiency.

[0003] The Chinese utility model patent, publication number CN213366393U, discloses a novel capacitor housing that is easy to assemble. The housing comprises an inner housing, an outer housing, a top plate, and a bottom plate. The outer housing has mounting slots at the four corners, and connecting rods are provided at the four corners of the lower end of the top plate. The connecting rods are inserted into the mounting slots and slideably connected thereto. Side plates are provided at the lower ends of the front and rear sides of the top plate, and the side plates slideably connect to the outer surface of the housing. A connecting plate is provided at the bottom end of the connecting rod, and the bottom of the connecting plate contacts the upper surface of the bottom plate. A third screw hole is provided on the connecting plate, and a third connecting hole is provided above the bottom plate. The connecting plate and the bottom plate are connected by screws passing through the third screw hole and the third connecting hole. This utility model overcomes the shortcomings of the prior art, features a reasonable design, is easy to install, and facilitates quick alignment and assembly, thereby improving assembly efficiency.

[0004] However, the above device still has the following technical problems when actually used:

[0005] 1. When the outer shell is sleeved on the outer side of the inner shell in the above-mentioned device, due to the lack of an alignment calibration device between the inner shell and the outer shell, the outer shell needs to be manually rotated after the outer shell is sleeved so that the mounting groove on the outer shell is aligned with the second connecting hole opened on the outer wall of the inner shell, so that after the connecting rod is subsequently inserted into the mounting groove, the second screw hole and the second connecting hole are aligned to facilitate the insertion of the screw to realize the assembly of the outer shell and the inner shell. The process of manually rotating the outer shell to align the mounting groove and the second connecting hole greatly increases the labor workload and also slows down the assembly efficiency between the outer shell and the inner shell.

[0006] 2. In addition, in the above-mentioned device, after the outer shell and the inner shell are assembled, the multiple connecting rods at the bottom of the top cover are inserted into the corresponding installation grooves, and then the top cover and the outer shell are assembled using multiple screws that penetrate the second screw hole-the second connecting hole and the first screw hole-the first connecting hole. This method requires manual assembly of multiple screws, the assembly process is long, and the assembly steps are relatively cumbersome, requiring manual labor costs. Utility Model Content

[0007] The utility model provides an aluminum capacitor housing that is easy to assemble, aiming to solve the problem mentioned in the above-mentioned background technology that, after the outer shell is placed on the outside of the inner shell, the outer shell needs to be manually rotated to align the mounting groove and the second connection hole, which greatly increases the manual labor and slows down the assembly efficiency of the inner and outer shells. In addition, when assembling the top cover of the above-mentioned device, multiple screws need to be tightened manually, resulting in a long assembly process and complicated steps.

[0008] The utility model is implemented as follows: a capacitor aluminum shell that is easy to assemble, comprising: a bottom plate, on which a capacitor inner shell is fixedly mounted, a placement groove is provided in the capacitor inner shell, a capacitor body is placed in the placement groove, a protective shell is arranged on the outside of the capacitor inner shell, and the protective shell is detachably fixed to the outside of the capacitor inner shell through a connecting mechanism, wherein a top cover is also provided in parallel with the top of the capacitor inner shell, a locking mechanism is provided on the outer wall of the protective shell, and is detachably connected to the top cover, and the locking mechanism is used to achieve the connection and fixation between the top cover and the protective shell; in this solution, the device Two protrusions are arranged opposite to each other on each outer side wall of the capacitor inner shell, and a recessed groove for accommodating the protrusions is opened on the inner side wall of the protective shell. When the protective shell moves downward from above the capacitor inner shell and is covered on the outer side of the capacitor inner shell for assembly, the protrusions are inserted into the inner side of the recessed groove. On the one hand, it can realize the guiding and limiting effect during the installation of the protective shell. On the other hand, the threaded section of the locking bolt passes through the through hole and is screwed into the threaded hole opened in the protrusion to realize stable assembly between the protective shell and the capacitor inner shell. No manual secondary installation is required, which reduces the manual workload. At the same time, the use of multiple locking bolts also prevents the protective shell and the capacitor inner shell from being separated.

[0009] In addition, when assembling the top cover of the present device, the plug plate on the side wall of the top cover is inserted into the locking groove opened on the top of the mounting box on the side wall of the protective shell. The plug plate is provided with a double fixing method in the locking groove. One is to use the end of the locking pin to pass through the first locking hole opened on the front side wall of the mounting box and then pass through the second locking hole on the plug plate, and then insert its end into the first locking hole on the rear side wall of the mounting box to prevent the plug plate and the mounting box from being separated. At the same time, when the plug plate is inserted into the locking groove, the position of the limit groove and the limit block on its side wall corresponds to that of the limit block. The limit block is inserted into the limit groove and cooperates with the locking pin to complete the installation and fixation of the plug plate in the mounting box. The installation of the top cover of the present device does not adopt bolt connection but plug-in connection, which can greatly improve the time of disassembly and reduce the labor required during manual disassembly.

[0010] Preferably, the connecting mechanism includes: a limiting member arranged on each side wall of the capacitor inner shell, and each limiting member has: two protrusions symmetrically arranged along the width of the capacitor inner shell, the protrusions and the capacitor inner shell are integrally formed, and the protrusions and the capacitor inner shell are of the same height, and recessed grooves are provided on the inner side wall of the protective shell corresponding to the multiple protrusions, and when the protective shell cover is arranged on the outside of the capacitor inner shell, the protrusions are inserted into the recessed grooves; in this scheme, when assembling the protective shell on the outside of the capacitor inner shell, the protective shell is first placed above the capacitor inner shell so that the placement cavity opened in the middle of the protective shell corresponds to the capacitor inner shell, and then the protective shell is moved downward so that the protective shell cover is arranged on the outside of the capacitor inner shell. During the downward movement, the protrusions are gradually inserted into the recessed grooves, and the stable assembly of the protective shell and the capacitor inner shell is achieved through the mutual cooperation of the recessed grooves and the protrusions.

[0011] Preferably, at least one through hole connected to the recessed groove is provided on the outer wall of the protective shell corresponding to each of the recessed grooves, and a locking bolt passes through the through hole, and a threaded hole is further provided on the side wall of the protrusion corresponding to the through hole, and the threaded section of the locking bolt is screwed into the threaded hole; in this scheme, after the protective shell cover is arranged on the outside of the capacitor inner shell, the through hole provided on the protective shell and the threaded hole on the protrusion are aligned, and then the threaded section of the locking bolt is passed through the through hole and screwed into the threaded hole, thereby realizing rapid assembly between the protective shell and the capacitor inner shell.

[0012] Preferably, the locking mechanism comprises: an installation box symmetrically fixedly installed on the two side walls of the protective shell, a locking groove is opened on the top wall of the installation box, and a first locking hole connected to the locking groove is opened on the front side wall and the rear side wall of the installation box. A plug-in plate is fixedly installed on the side wall of the top cover, and the plug-in plate is partially inserted into the locking groove, and a second locking hole and a locking pin are opened on the plug-in plate. When the plug-in plate is inserted into the locking groove, one end of the locking pin passes through the second locking hole, and both ends are located in the first locking holes on both sides. In this scheme, when the top cover is assembled, , place the top cover above the protective shell and the capacitor inner shell, and at the same time insert the plug-in plate on the side wall of the top cover into the locking groove on the top of the installation box set on the two side walls of the protective shell. After the top cover is pressed onto the protective shell, the plug-in plate is partially located in the locking groove, and at the same time, the second locking hole on the plug-in plate is aligned with the first locking hole on the front side wall and the rear side wall of the installation box. Insert one end of the locking pin along the first locking hole on the front side wall of the installation box, then pass through the second locking hole and then insert it into the first locking hole opened on the rear side wall of the installation box. Use the locking pin to fix the plug-in plate in the locking groove to prevent the top cover and the protective shell from separating.

[0013] Preferably, limit slots are symmetrically provided on both side walls of the plug board, and slot holes are also provided on both side walls of the installation box, in which limit blocks are slidably connected, and the limit blocks are detachably fixedly connected to the limit slots; in this scheme, a second method of limiting and fixing the plug board is also provided, wherein before the plug board is inserted into the locking slot, the limit blocks on both sides are pulled out of the locking slot along the slot holes, and then after the plug board is inserted into the locking slot, after the bottom end of the top cover is pressed against the protective shell, the limit slot and the slot hole are aligned, and then the limit block is inserted into the locking slot along the slot hole and inserted into the limit slot to cooperate with the locking pin to achieve double fixation of the plug board.

[0014] The lockhole that is formed on the two ends of the support frame is formed on the upper surface of the support frame, and the lockhole that is formed on the two ends of the support frame is formed. The lockhole that is formed on the two ends of the support frame is formed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an aluminum housing for capacitors that is easy to assemble:

[0016] 1. The device is provided with two protrusions on each outer side wall of the capacitor inner shell, and a recessed groove for accommodating the protrusions is provided on the inner side wall of the protective shell. When the protective shell moves downward from the top of the capacitor inner shell and is covered on the outside of the capacitor inner shell for assembly, the protrusion is inserted into the inner side of the recessed groove. On the one hand, it can achieve a guiding and limiting effect on the installation of the protective shell. On the other hand, the threaded section of the locking bolt passes through the through hole and is screwed into the threaded hole provided in the protrusion to achieve stable assembly between the protective shell and the capacitor inner shell. No manual secondary installation is required, which reduces the workload. At the same time, the use of multiple locking bolts also prevents the protective shell and the capacitor inner shell from detaching.

[0017] 2. When assembling the top cover of the device, the plug-in plate on the side wall of the top cover is inserted into the locking groove opened on the top of the mounting box on the side wall of the protective shell. The plug-in plate is provided with a double fixing method in the locking groove. One is to use the end of the locking pin to pass through the first locking hole opened on the front side wall of the mounting box and then pass through the second locking hole on the plug-in plate, and then insert its end into the first locking hole on the rear side wall of the mounting box to prevent the plug-in plate and the mounting box from being separated. At the same time, when the plug-in plate is inserted into the locking groove, the position of the limit groove and the limit block on its side wall corresponds to the position of the limit block. The limit block is inserted into the limit groove and cooperates with the locking pin to complete the installation and fixation of the plug-in plate in the mounting box. The installation of the top cover of the device does not adopt bolt connection but plug-in connection, which can greatly improve the time of disassembly and reduce the labor required during manual disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the utility model;

[0019] Figure 2 For this utility model Figure 1 's expanded diagram;

[0020] Figure 3 For the utility model Figure 2 A magnified view of the structure at center A;

[0021] Figure 4 A top view of the assembly of the protective shell and the capacitor inner shell in the utility model;

[0022] Figure 5 This is a front view of the inner shell of the capacitor in the utility model;

[0023] Figure 6 For this utility model Figure 4 A magnified view of the structure at B in the middle;

[0024] In the picture:

[0025] 1. Bottom plate;

[0026] 2. Capacitor inner shell; 21. Placement slot;

[0027] 3. Protective shell;

[0028] 4. Connecting mechanism; 41. Protrusion; 42. Recessed groove; 43. Through hole; 44. Locking bolt; 45. Threaded hole;

[0029] 5. Top cover;

[0030] 6. Locking mechanism; 61. Mounting box; 62. Locking slot; 63. First locking hole; 64. Insert plate; 641. Limiting slot; 642. Limiting block; 65. Second locking hole; 66. Locking pin; 67. Reset assembly; 671. Connecting plate; 672. Connecting rod; 673. Slide plate; 674. Reset spring; 675. Pull rod. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0033] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] See also Figure 1-6The utility model provides a technical solution: a capacitor aluminum shell that is easy to assemble, comprising: a bottom plate 1, on which a capacitor inner shell 2 is fixedly mounted, a placement groove 21 is provided in the capacitor inner shell 2, and a capacitor body is placed in the placement groove 21, a protective shell 3, which is arranged on the outside of the capacitor inner shell 2, and the protective shell 3 is detachably fixed to the outside of the capacitor inner shell 2 through a connecting mechanism 4, wherein a top cover 5 is also provided in parallel with the top of the capacitor inner shell 2, a locking mechanism 6, which is provided on the outer wall of the protective shell 3 and is detachably connected to the top cover 5, and the locking mechanism 6 is used to realize the connection and fixation between the top cover 5 and the protective shell 3.

[0037] Specifically, in this device, a heat dissipation component can also be installed on the protective shell 3 to quickly dissipate the heat generated by the capacitor body during operation, wherein the heat dissipation component has: an air inlet slot opened on one side wall of the protective shell 3, an air outlet slot opened on the other side wall of the protective shell 3 corresponding to the air inlet slot, an air intake fan is fixedly installed in the air inlet slot, and at the same time, a number of air holes are opened on the side walls of the capacitor inner shell 2 corresponding to the air inlet slot and the air outlet slot. When the air intake fan works to draw the outside cold air into the inside of the protective shell 3, the cold air enters the interior of the capacitor inner shell 2 along the air holes on this side, and is discharged from the air holes on the other side after the heat is converted, and then discharged from the protective shell 3 along the air outlet slot to ensure the ambient temperature inside the capacitor inner shell 2 and prevent the capacitor body from being damaged by high temperature.

[0038] It needs to be explained that in order to prevent dust and impurities in the outside air from entering the capacitor inner shell 2 through the air inlet slot, air outlet slot and air vent, a filter screen is installed on the air inlet slot and the air outlet slot. The filter screen is provided with a number of fine sieve holes, which can filter out fine particles in the air and ensure that the placement slot 21 inside the capacitor inner shell 2 is clean.

[0039] Furthermore, the connecting mechanism 4 includes: a limit member arranged on each side wall of the capacitor inner shell 2, and each limit member has: two protrusions 41 symmetrically arranged along the width of the capacitor inner shell 2, the protrusions 41 and the capacitor inner shell 2 are integrally formed, and the protrusions 41 and the capacitor inner shell 2 are at the same height, and recessed grooves 42 are provided on the inner side wall of the protective shell 3 corresponding to the multiple protrusions 41. When the protective shell 3 is covered on the outside of the capacitor inner shell 2, the protrusions 41 are inserted into the recessed grooves 42.

[0040] It should be noted that the two protrusions 41 installed on the outer wall of each side of the capacitor inner shell 2 are arranged opposite to each other, and each protrusion 41 is located at the edge of the side wall, that is, the two protrusions 41 are symmetrically arranged at the two ends of the capacitor inner shell 2 along the length of the side. The purpose is to increase the distance between the two protrusions 41 to facilitate the subsequent installation of other working parts (such as the air inlet slots, air outlet slots, and air vents mentioned above) on the protective shell 3 and the capacitor inner shell 2, so as to avoid affecting the assembly of other working parts.

[0041] Furthermore, at least one through hole 43 connecting to the recessed groove 42 is provided on the outer wall of the protective shell 3 corresponding to each recessed groove 42, and a locking bolt 44 passes through the through hole 43. A threaded hole 45 is also provided on the side wall of the protrusion 41 corresponding to the through hole 43, and the threaded section of the locking bolt 44 is screwed into the threaded hole 45.

[0042] Furthermore, the locking mechanism 6 comprises: an installation box 61 symmetrically fixedly mounted on the two side walls of the protective shell 3, a locking groove 62 being provided on the top wall thereof, and first locking holes 63 communicating with the locking groove 62 being provided on the front side wall and the rear side wall of the installation box 61; an insert plate 64 is fixedly mounted on the side wall of the top cover 5, the insert plate 64 is partially inserted into the locking groove 62, and a second locking hole 65 and a locking pin 66 are provided on the insert plate 64. When the insert plate 64 is inserted into the locking groove 62, one end of the locking pin 66 passes through the second locking hole 65, and both ends are located in the first locking holes 63 on both sides.

[0043] Furthermore, limiting grooves 641 are symmetrically provided on both side walls of the plug board 64, and slots are also provided on both side walls of the installation box 61, in which limiting blocks 642 are slidably connected, and the limiting blocks 642 are detachably fixedly connected in the limiting grooves 641.

[0044] Furthermore, it also includes a reset component 67, which has: connecting plates 671 are symmetrically arranged on both sides of the installation box 61, each connecting plate 671 is fixedly connected to the side wall of the installation box 61 through two connecting rods 672, and the two connecting rods 672 are respectively located on both sides of the slot, and a slide plate 673 is slidably connected to the two connecting rods 672, and is fixedly connected to the limit block 642. A reset spring 674 is sleeved on the connecting rod 672 on the side of the slide plate 673 away from the installation box 61, and a pull rod 675 runs through the connecting plate 671, one end of which is fixedly connected to the slide plate 673.

[0045] Specifically, it should be noted that the reset spring 674 is sleeved on the outside of the connecting rod 672 and is located between the slide 673 and the connecting plate 671. At the same time, the two ends of the reset spring 674 respectively abut against the side wall of the connecting plate 671 close to the installation box 61 and the side wall of the slide 673 away from the installation box 61.

[0046] The working principle and use process of this utility model:

[0047] When assembling the protective shell 3, the protective shell 3 is placed above the capacitor inner shell 2 and then moved downward. The mutual cooperation between the recessed groove 42 and the protruding portion 41 serves to limit and guide the assembly of the protective shell 3. When the protective shell 3 is assembled, the through hole 43 on the protective shell 3 and the threaded hole 45 on the protruding portion 41 are aligned. The threaded section of the locking bolt 44 is passed through the through hole 43 and then screwed into the threaded hole 45 to complete the assembly of the protective shell 3 and the capacitor inner shell 2.

[0048] Then, the top cover 5 is pressed onto the protective shell 3, and the pull rod 675 is pulled in the direction away from the installation box 61. The limit block 642 is pulled out of the locking groove 62 by the pull rod 675. When the top cover 5 is placed on top of the protective shell 3, the plug plate 64 on its side wall will be gradually inserted into the locking groove 62. When the top cover 5 is placed, the pull rod 675 is released, and the return spring 674 rebounds to drive the limit block 642 to be inserted into the limit groove 641 to complete the locking of the plug plate 64. At the same time, the second locking hole 65 on the plug plate 64 is aligned with the first locking hole 63 on the front and rear side walls of the installation box 61. Then, one end of the locking pin 66 is passed through one first locking hole 63, then passes through the second locking hole 65 and is inserted into the first locking hole 63 on the other side to achieve double fixation of the plug plate 64 in the locking groove 62.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A capacitor aluminum housing that is easy to assemble, characterized by: include: A bottom plate (1) is fixedly mounted with a capacitor inner shell (2), wherein a placement groove (21) is provided in the capacitor inner shell (2), and a capacitor body is placed in the placement groove (21); A protective shell (3) is arranged on the outside of the capacitor inner shell (2), and the protective shell (3) is detachably fixedly mounted on the outside of the capacitor inner shell (2) via a connecting mechanism (4); Wherein, a top cover (5) is also provided in parallel with the top of the capacitor inner shell (2); A locking mechanism (6) is provided on the outer wall of the protective shell (3) and is detachably connected to the top cover (5). The locking mechanism (6) is used to achieve a fixed connection between the top cover (5) and the protective shell (3).

2. The aluminum housing for capacitors that is easy to assemble as claimed in claim 1, characterized in that: The connecting mechanism (4) comprises: A limiting member is provided on each side wall of the capacitor inner shell (2), and each limiting member has: Two protrusions (41) are symmetrically arranged along the width of the capacitor inner shell (2), the protrusions (41) and the capacitor inner shell (2) are integrally formed, and the protrusions (41) and the capacitor inner shell (2) are of the same height; The inner side wall of the protective shell (3) is provided with recessed grooves (42) corresponding to the plurality of protrusions (41); when the protective shell (3) is covered on the outside of the capacitor inner shell (2), the protrusions (41) are inserted into the recessed grooves (42).

3. The capacitor aluminum housing that is easy to assemble as claimed in claim 2, characterized in that: At least one through hole (43) communicating with the recessed groove (42) is provided on the outer wall of the protective shell (3) corresponding to each recessed groove (42), and a locking bolt (44) passes through the through hole (43); A threaded hole (45) is also provided on the side wall of the protruding portion (41) corresponding to the through hole (43), and the threaded section of the locking bolt (44) is screwed into the threaded hole (45).

4. The capacitor aluminum housing that is easy to assemble as claimed in claim 1, characterized in that: The locking mechanism (6) has: A mounting box (61) is symmetrically fixedly mounted on both side walls of the protective shell (3), a locking groove (62) is provided on the top wall thereof, and first locking holes (63) communicating with the locking groove (62) are provided on the front side wall and the rear side wall of the mounting box (61); A plug plate (64) is fixedly mounted on the side wall of the top cover (5), a portion of the plug plate (64) is inserted into the locking groove (62), and a second locking hole (65) is formed on the plug plate (64); A locking pin (66), when the inserting plate (64) is inserted into the locking groove (62), one end of the locking pin (66) passes through the second locking hole (65), and both ends are located in the first locking holes (63) on both sides.

5. The capacitor aluminum housing that is easy to assemble as claimed in claim 4, characterized in that: The two side walls of the plug board (64) are symmetrically provided with limiting grooves (641), and the two side walls of the installation box (61) are also provided with slots, in which limiting blocks (642) are slidably connected, and the limiting blocks (642) are detachably fixedly connected to the limiting grooves (641).

6. The capacitor aluminum housing that is easy to assemble as claimed in claim 5, characterized in that: Also included is a reset assembly (67) having: Connecting plates (671) are symmetrically provided on both sides of the installation box (61), and each of the connecting plates (671) is fixed to the side wall of the installation box (61) through two connecting rods (672), and the two connecting rods (672) are respectively located on both sides of the slot; A slide plate (673) is slidably connected to the two connecting rods (672) and fixedly connected to the limit block (642). A return spring (674) is sleeved on the connecting rod (672) on the side of the slide plate (673) away from the installation box (61); A pull rod (675) passes through the connecting plate (671), one end of which is fixedly connected to the slide plate (673).

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