A combined air-cooled shell

Abstract

The present invention discloses a combined air-cooled housing, which relates to the field of air-cooling technology for new energy products. It comprises a box body, a top plate is installed on the top of the box body by bolts, a heat dissipation fin is installed on the bottom of the box body, a first cover is installed on the bottom of the box body, and a second cover is installed on the bottom of the first cover. In the present invention, when the heat dissipation fins generate high temperature locally, there may be a lot of dust attached to the surface thereof. By providing the first cover, the second cover, the fan, the adjustment plate and the cooling and cleaning assembly, the heat dissipation fins can be locally cooled while the dust on the surface of the heat dissipation fins can be cleaned. The high-temperature area of ​​the heat dissipation fins is concentratedly cooled, thereby avoiding the energy waste that may be caused by the overall heat dissipation, and ensuring that the high-temperature area is cooled in a timely and effective manner. The dust on the surface of the heat dissipation fins is removed during the heat dissipation process to prevent dust accumulation from affecting the heat dissipation effect and maintain the best working state of the heat dissipation fins.

Description

Technical Field

[0001] The present invention relates to the technical field of air cooling of new energy products, in particular to a combined air cooling housing. Background Art

[0002] With the rapid development of 5G communications, data centers, industrial control, and new energy equipment, the power density and integration of power electronic equipment (such as inverters, frequency converters, servers, and power modules) are continuously increasing, significantly increasing the amount of heat generated per unit volume. For example, the high-frequency switching power supplies of communication base stations and the high-density server clusters in data centers generate a large amount of heat during operation. If this heat cannot be dissipated in a timely manner, it will cause the equipment to overheat. Air cooling (forced air convection) is one of the most important heat dissipation methods for small and medium-power electronic and electrical equipment (such as communications equipment, servers, frequency converters, inverters, power modules, industrial computers, charging stations, LED lighting, etc.) due to its relatively low cost, simple implementation, mature technology, and easy maintenance.

[0003] The heat generated by the air-cooled housing is different, which will cause the heat absorbing areas of the heat sink fins to be different. Due to the fixed installation of the fan on the surface of the housing, the output direction of the airflow is fixed. At this time, the airflow generated in the gaps between the multiple sets of fans is small, which is not convenient for cooling the heat sink fins. In addition, the airflow generated by the fan during cooling may bring external dust into the housing, causing the dust to gradually accumulate on the surface of the heat sink fins, forming a heat insulation layer, which hinders the effective transfer of heat, thereby reducing the heat dissipation efficiency of the fan and causing the temperature inside the housing to rise.

[0004] In response to the above problems, it is urgent to carry out innovative design based on the original foundation. Summary of the Invention

[0005] The purpose of the present invention is to provide a combined air-cooled housing to solve the problem in the above-mentioned background technology that the airflow generated in the gaps between multiple groups of fans is small, which makes it inconvenient to cool the heat dissipation fins. The airflow generated by the fans during cooling may bring external dust into the housing, causing the dust to gradually accumulate on the surface of the heat dissipation fins. The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a combined air-cooled housing, comprising a box body, a top plate is installed on the top of the box body by bolts, a heat dissipation fin is installed on the bottom of the box body, a first cover shell is installed on the bottom of the box body, a second cover shell is installed on the bottom of the first cover shell, a first adjustment platform is installed on the bottom of the first cover shell away from the second cover shell, a fan is limitedly slidably provided inside the first cover shell, an adjustment plate is limitedly slidably provided at the bottom end of the first cover shell, a first electric push rod is installed on the front surface of the first cover shell, the protruding end of the first electric push rod is connected to the adjustment plate, a cooling and cleaning component is provided inside the first cover shell and the second cover shell, and a dust removal and cleaning mechanism is provided on the left side of the first cover shell;

[0007] The cooling and cleaning component includes a rotating plate rotatably connected to the inside of the first cover shell, and also includes an opening and closing plate rotatably connected to the notch in the bottom end of the first cover shell. The rear end of the first cover shell is rotatably connected to the first gear and the second gear. A second electric push rod is installed on the rear end surface of the first cover shell, and a rack is installed on the protruding end of the second electric push rod. The rack is meshed with the first gear and the second gear. A second adjustment platform is installed inside the second cover shell, and a blocking plate is provided at the top end of the second cover shell for limiting sliding. The interior of the blocking plate is threadedly connected to the internal screw rod of the second adjustment platform.

[0008] Preferably, the heat dissipation fins are located inside the first housing, a cover plate is installed on the left side of the first housing, and a ventilation groove is provided on the surface of the cover plate.

[0009] Preferably, the number of the fans is three groups, and the three groups of fans are equidistantly distributed inside the first housing. The bottom end protrusion of the fan is threadedly connected to the internal screw rod of the first adjustment platform, and a temperature sensor is installed on the surface of the fan output end.

[0010] Preferably, a vent hole is provided at the bottom end of the first cover shell, and a vent hole of the same specification as that of the first cover shell is provided inside the adjustment plate, and the vent hole at the bottom end of the first cover shell and the vent hole inside the adjustment plate are staggered.

[0011] Preferably, the internal rotating shaft of the rotating plate passes through the side end of the first housing and is connected to the first gear, and the internal rotating shaft of the opening and closing plate passes through the side end of the first housing and is connected to the second gear.

[0012] Preferably, an extension plate is provided in the internal slide groove of the rotating plate for limiting sliding, a spring is installed on the inner wall of the internal slide groove of the extension plate, and the other end of the spring is connected to the extension plate. An arc groove is provided on the inner side wall of the first cover shell, and a protrusion is installed on the side end of the extension plate, and the protrusion is limited to sliding in the arc groove inside the first cover shell.

[0013] Preferably, the dust removal and cleaning mechanism includes a scraper that slides in a limited position on the surface of the cover plate, and also includes a cleaning table installed in the groove at the bottom of the box body, a first oil chamber is opened inside the bottom end of the cleaning table, a first piston rod is limitedly slid inside the first oil chamber, a scraper is installed at the bottom end of the first piston rod, a second oil chamber is opened inside the top end of the cleaning table, and a second piston rod is limitedly slid inside the second oil chamber.

[0014] Preferably, a movable platform is installed at the side end of the first cover shell, the scraper is connected to the internal screw of the movable platform by a thread, and the scraper is tightly attached to the surface of the cover plate.

[0015] Preferably, the cleaning table slides within a limited position in a groove at the bottom of the box body, the end of the second piston rod is connected to a side wall of the groove at the bottom of the box body, and the first oil chamber is communicated with the second oil chamber.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The first fan, the second fan, the second adjustment means, and the like which are used to clear the heat from the fans have done a lot, so as to make the fans have a clearer and clearer appearance, thereby significantly shortening the service life of the heat sink.

[0018] The present invention can clean the fan air inlet through the provided fan, cover plate and dust removal and cleaning mechanism, avoid dust accumulation at the air inlet, and reduce the problem of dust adhering to the surface of the heat dissipation fins. Since the accumulation of dust at the fan air inlet will gradually form a blockage, affecting the air circulation, the dust removal and cleaning mechanism can timely remove the dust, thereby ensuring that the air inlet is unobstructed, increasing the air circulation speed, and thus improving the heat dissipation efficiency. In addition, by cleaning the air inlet, the adhesion of dust on the heat dissipation fins is indirectly reduced, further improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural diagram of the present invention from one perspective;

[0020] Figure 2 For the present invention Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 3 A structural diagram of another perspective of the present invention;

[0022] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at B in the middle;

[0023] Figure 5 This is a schematic diagram of the explosion structure of the first cover of the present invention;

[0024] Figure 6 Schematic diagram of the cross-sectional structure of the first cover shell and the second cover shell of the present invention;

[0025] Figure 7 For the present invention Figure 6 The enlarged structural diagram at C in the middle;

[0026] Figure 8 This is a schematic diagram of the partial structure of the dust removal and cleaning mechanism of the present invention;

[0027] Figure 9 For the present invention Figure 8 The enlarged structural diagram at D in the middle;

[0028] Figure 10 Schematic diagram of the cross-sectional structure of the cleaning table of the present invention;

[0029] Figure 11 It is a schematic diagram of the explosion structure of the adjustment plate of the present invention.

[0030] In the figure: 1. box body; 2. top plate; 3. heat dissipation fins; 4. first cover shell; 5. second cover shell; 6. first adjustment platform; 7. fan; 8. first electric push rod; 9. adjustment plate; 101. rotating plate; 102. extension plate; 103. opening and closing plate; 104. first gear; 105. second gear; 106. second electric push rod; 107. rack; 108. second adjustment platform; 109. blocking plate; 11. cover plate; 121. moving platform; 122. scraper; 123. cleaning platform; 124. first oil chamber; 125. first piston rod; 126. scraper platform; 127. second oil chamber; 128. second piston rod. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1-11 The present invention provides a technical solution: a combined air-cooled housing, comprising a housing 1, a top plate 2 being mounted on the top of the housing 1 by bolts, a heat dissipation fin 3 being mounted on the bottom of the housing 1, a first cover shell 4 being mounted on the bottom of the housing 1, a second cover shell 5 being mounted on the bottom of the first cover shell 4, a first adjustment platform 6 being mounted on the bottom of the bottom of the first cover shell 4 away from the second cover shell 5, a fan 7 being limitedly slidably provided inside the first cover shell 4, an adjustment plate 9 being limitedly slidably provided at the bottom end of the first cover shell 4, a first electric push rod 8 being mounted on the front surface of the first cover shell 4, an extended end of the first electric push rod 8 being connected to the adjustment plate 9, a cooling and cleaning assembly being arranged inside the first cover shell 4 and the second cover shell 5, and a dust removal and cleaning mechanism being arranged on the left side of the first cover shell 4;

[0033] The cooling and cleaning component includes a rotating plate 101 rotatably connected to the inside of the first cover shell 4, and also includes an opening and closing plate 103 rotatably connected to the notch in the bottom end of the first cover shell 4. The rear end of the first cover shell 4 is rotatably connected to the first gear 104 and the second gear 105. A second electric push rod 106 is installed on the rear end surface of the first cover shell 4, and a rack 107 is installed on the protruding end of the second electric push rod 106. The rack 107 is engaged with the first gear 104 and the second gear 105. A second adjustment platform 108 is installed inside the second cover shell 5. A blocking plate 109 is provided for sliding at the top end of the second cover shell 5. The inside of the blocking plate 109 is threadedly connected to the screw rod inside the second adjustment platform 108. The cooling and cleaning component can locally cool the heat dissipating fins 3 while cleaning the dust on the surface of the heat dissipating fins 3, and concentrate the heat dissipation on the high temperature area of ​​the heat dissipating fins 3, thereby avoiding the energy waste caused by overall heat dissipation.

[0034] As an embodiment of the present invention, the heat dissipation fins 3 are located inside the first housing 4. A cover plate 11 is installed on the left side of the first housing 4. A ventilation groove is opened on the surface of the cover plate 11. The ventilation groove on the surface of the cover plate 11 forms an air inlet for the fan 7, which can initially block external dust.

[0035] As an embodiment of the present invention, the number of fans 7 is three groups, and the three groups of fans 7 are evenly distributed inside the first housing 4. The bottom end protrusions of the fans 7 are threadedly connected to the screw rod inside the first adjustment platform 6. A temperature sensor is installed on the surface of the output end of the fan 7. The three groups of fans 7 can evenly cool the interior of the first housing 4, thereby improving the cooling effect of the heat sink 3.

[0036] As an embodiment of the present invention, a vent hole is opened at the bottom end of the first housing 4, and a vent hole of the same specification as that of the first housing 4 is opened inside the adjustment plate 9. The vent hole at the bottom end of the first housing 4 and the vent hole inside the adjustment plate 9 are staggered. The opening of the vent holes inside the first housing 4 and the adjustment plate 9 can flexibly adjust the caliber of the output airflow.

[0037] As an embodiment of the present invention, the internal rotating shaft of the rotating plate 101 passes through the side end of the first housing 4 and is connected to the first gear 104, and the internal rotating shaft of the opening and closing plate 103 passes through the side end of the first housing 4 and is connected to the second gear 105. When the rack 107 drives the first gear 104 and the second gear 105 to rotate synchronously, the rotating plate 101 and the opening and closing plate 103 can be driven to rotate synchronously.

[0038] As an embodiment of the present invention, an extension plate 102 is limitedly slid in the internal slide groove of the rotating plate 101, a spring is installed on the inner wall of the internal slide groove of the extension plate 102, and the other end of the spring is connected to the extension plate 102. An arc-shaped groove is opened on the inner side wall of the first cover shell 4, and a protrusion is installed on the side end of the extension plate 102. The protrusion is limitedly slid in the arc-shaped groove inside the first cover shell 4. When the rotating plate 101 rotates, the extension plate 102 can be extended to allow airflow to enter the second cover shell 5;

[0039] As an embodiment of the present invention, the dust removal and cleaning mechanism includes a scraper 122 that is limited and slides on the surface of the cover plate 11, and also includes a cleaning table 123 installed in the groove at the bottom of the box body 1, a first oil chamber 124 is opened inside the bottom end of the cleaning table 123, a first piston rod 125 is limited and slides inside the first oil chamber 124, a scraper 126 is installed at the bottom end of the first piston rod 125, a second oil chamber 127 is opened inside the top end of the cleaning table 123, a second piston rod 128 is limited and slides inside the second oil chamber 127, and the dust removal and cleaning mechanism can clean the air inlet of the fan 7, avoid dust accumulation at the air inlet, and reduce the problem of dust adhering to the surface of the heat sink fin 3;

[0040] As an embodiment of the present invention, a movable platform 121 is installed at the side end of the first cover shell 4, and a scraper 122 is threadedly connected to the internal screw of the movable platform 121. The scraper 122 is tightly attached to the surface of the cover plate 11. The cleaning platform 123 slides within the groove at the bottom of the box body 1. The end of the second piston rod 128 is connected to the side wall of the groove at the bottom of the box body 1. The first oil chamber 124 is connected to the second oil chamber 127. When the cleaning platform 123 moves, it can clean the scraper 122.

[0041] The airflow generated in the gaps between the multiple sets of fans 7 is small, which is not convenient for cooling the heat dissipation fins 3. The airflow generated by the fans 7 when cooling may bring external dust into the shell, causing the dust to gradually accumulate on the surface of the heat dissipation fins 3. The specific implementation is as follows: when the heat dissipation fins 3 absorb the heat generated inside the box body 1, the controller drives the fans 7 to work, and drives the internal screw rod of the first adjustment platform 6 to rotate through the motor, and the screw rod drives the fans 7 to move back and forth inside the first cover 4 to evenly cool the heat dissipation fins 3. While the motor drives the internal screw rod of the first adjustment platform 6 to rotate, the controller drives the internal screw rod of the moving platform 121 to rotate back and forth through the motor, driving the internal screw rod of the moving platform 121 to rotate back and forth, driving the scraper 122 to move on the surface of the cover plate 11. When the scraper 122 hits the scraper platform 126, the scraper 122 The platform 126 squeezes the first piston rod 125 to inject the oil in the first oil chamber 124 into the second oil chamber 127. The oil in the second oil chamber 127 increases and squeezes the second piston rod 128, causing the second piston rod 128 to extend from the second oil chamber 127. The extension of the second piston rod 128 drives the cleaning platform 123 to slide within the groove at the bottom of the box body 1. The movement of the cleaning platform 123 drives the scraping platform 126 to move synchronously to clean the dust on the top of the scraper 122. When the scraper 122 moves downward, the scraping platform 126 loses its resistance force, and the spring drives the scraping platform 126 to automatically reset. The scraping platform 126 resets and transfers the oil in the second oil chamber 127 back to the first oil chamber 124. At this time, the oil in the second oil chamber 127 returns to its original state, so that the second piston rod 128 drives the cleaning platform 123 to automatically reset.

[0042] Working principle: When the heat dissipation fins 3 absorb the heat generated inside the box body 1, the controller drives the fan 7 to work, and drives the internal screw of the first adjustment platform 6 to rotate through the motor. The screw drives the fan 7 to reciprocate inside the first cover 4 to evenly cool the heat dissipation fins 3. While the motor drives the internal screw of the first adjustment platform 6 to rotate, the controller drives the internal screw of the moving platform 121 to rotate back and forth through the motor, driving the internal screw of the moving platform 121 to rotate back and forth, driving the scraper 122 to move on the surface of the cover plate 11. When the scraper 122 hits the scraper 126, the scraper 126 squeezes the first piston rod 125 to inject the oil inside the first oil chamber 124 into the second oil chamber 127. The oil in the second oil chamber 127 increases and squeezes the second piston rod 128, causing the second piston rod 128 to extend from the second oil chamber 127. The extension of the second piston rod 128 drives the cleaning table 123 to slide within the groove at the bottom of the box body 1. The movement of the cleaning table 123 drives the scraping table 126 to move synchronously to clean the dust on the top of the scraper 122. When the scraper 122 moves downward, the scraping table 126 loses its resistance, and the spring drives the scraping table 126 to automatically reset. The scraping table 126 resets and transfers the oil in the second oil chamber 127 back to the first oil chamber 124. At this time, the oil in the second oil chamber 127 returns to its original state, so that the second piston rod 128 drives the cleaning table 123 to automatically reset.

[0043] When the surface temperature sensor of the fan 7 detects that the heat dissipation fin 3 locally generates high temperature, the controller drives the extended end of the first electric push rod 8 to push the adjustment plate 9 to move at the bottom of the first cover 4, so that the internal vent hole of the adjustment plate 9 gradually coincides with the internal vent hole of the first cover 4. After the motor drives the internal screw rod of the first adjustment platform 6 to drive the fan 7 to rotate to the high temperature area, the side motor of the first adjustment platform 6 stops working. At the same time as the side motor of the first adjustment platform 6 stops working, the controller drives the motor to drive the internal screw rod of the second adjustment platform 108 to rotate, and the rotation of the screw rod drives the blocking plate 109 to move until the blocking plate 109 moves to block the vent hole near the high temperature area. At this time, the side motor of the second adjustment platform 108 stops operating. At the same time, the controller drives the extended end of the second electric push rod 106 to extend and drive the rack 1 07 moves downward, and when the rack 107 moves downward, it drives the first gear 104 and the second gear 105 to rotate synchronously. When the first gear 104 rotates, it drives the rotating plate 101 to rotate. At this time, the internal extension plate 102 of the rotating plate 101 is limited and slides in the arc groove at the side end of the first cover shell 4. When the rotating plate 101 rotates 90°, the extension plate 102 extends from the rotating plate 101 to block the cavity at the side end of the first cover shell 4. When the second gear 105 rotates, it drives the opening and closing plate 103 to rotate to open the gap at the bottom end of the first cover shell 4. The airflow generated by the fan 7 is blocked by the rotating plate 101 and the extension plate 102, and enters the second cover shell 5 from the gap at the bottom end of the first cover shell 4, and then is discharged through the internal vents of the first cover shell 4 and the adjustment plate 9. While locally cooling the heat dissipation fins 3, the dust attached to the surface of the heat dissipation fins 3 can be cleaned.

[0044] Any content not described in detail in this specification is prior art known to those skilled in the art. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are therefore not to be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connected" are to be understood broadly, meaning, for example, fixedly connected, detachably connected, or integrally connected; mechanically connected, electrically connected; directly connected, or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention on a case-by-case basis.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. 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 combined air-cooled housing, comprising a housing (1), characterized in that: The top of the box (1) is fixed with a top plate (2) by bolts, the bottom of the box (1) is fixed with a heat dissipation fin (3), the bottom of the box (1) is fixed with a first cover (4), the bottom of the first cover (4) is fixed with a second cover (5), the bottom of the first cover (4) away from the second cover (5) is fixed with a first adjustment platform (6), the first cover (4) is provided with a fan (7) for limited sliding inside, the bottom of the first cover (4) is provided with an adjustment plate (9) for limited sliding inside the bottom end, and the front surface of the first cover (4) is fixed with a first electric push rod (8) ), the protruding end of the first electric push rod (8) is connected to the adjustment plate (9), the first housing (4) and the second housing (5) are provided with cooling and cleaning components, the left side of the first housing (4) is provided with a dust removal and cleaning mechanism, the heat dissipation fins (3) are located inside the first housing (4), a cover plate (11) is installed on the left side of the first housing (4), a ventilation groove is provided on the surface of the cover plate (11), a ventilation hole is provided at the bottom end of the first housing (4), a ventilation hole of the same specification as that of the first housing (4) is provided inside the adjustment plate (9), the first The vent holes at the bottom end of the cover (4) and the vent holes at the adjustment plate (9) are staggered. The dust removal and cleaning mechanism includes a scraper (122) that is limitedly slidable on the surface of the cover (11), and also includes a cleaning table (123) installed in the groove at the bottom of the box (1). A first oil chamber (124) is provided inside the bottom end of the cleaning table (123). A first piston rod (125) is limitedly slidable inside the first oil chamber (124). A scraper (126) is installed at the bottom end of the first piston rod (125). A second oil chamber is provided inside the top end of the cleaning table (123). (127), a second piston rod (128) is limitedly slidable inside the second oil chamber (127), a movable platform (121) is installed on the side end of the first cover shell (4), the scraper (122) is connected to the internal screw of the movable platform (121) by thread, the scraper (122) is tightly attached to the surface of the cover plate (11), the cleaning table (123) is limitedly slidable in the bottom groove of the box body (1), the end of the second piston rod (128) is connected to the side wall of the bottom groove of the box body (1), and the first oil chamber (124) is connected to the second oil chamber (127); The cooling and cleaning component includes a rotating plate (101) rotatably connected to the inside of the first housing (4), and also includes an opening and closing plate (103) rotatably connected to the notch at the bottom end of the first housing (4); the rear end of the first housing (4) is rotatably connected to a first gear (104) and a second gear (105); a second electric push rod (106) is installed on the rear end surface of the first housing (4); a rack (107) is installed on the protruding end of the second electric push rod (106); the rack (107) is connected to the first gear (104) and the second gear (105); The two gears (105) are meshed with each other, a second adjustment platform (108) is installed inside the second cover shell (5), a blocking plate (109) is provided at the top end of the second cover shell (5) for limiting sliding, the inside of the blocking plate (109) is connected to the internal screw rod of the second adjustment platform (108) through a thread, the internal rotating shaft of the rotating plate (101) passes through the side end of the first cover shell (4) and is connected to the first gear (104), and the internal rotating shaft of the opening and closing plate (103) passes through the side end of the first cover shell (4) and is connected to the second gear (105).

2. The combined air-cooled housing according to claim 1, characterized in that: The number of the fans (7) is three groups, and the three groups of fans (7) are evenly distributed inside the first housing (4). The bottom end protrusions of the fans (7) are threadedly connected to the internal screw rod of the first adjustment platform (6), and a temperature sensor is installed on the surface of the output end of the fan (7).

3. The combined air-cooled housing according to claim 2, characterized in that: An extension plate (102) is provided in the internal sliding groove of the rotating plate (101) for limited sliding. A spring is installed on the inner wall of the internal sliding groove of the extension plate (102). The other end of the spring is connected to the extension plate (102). An arc groove is provided on the inner side wall of the first cover shell (4). A protrusion is installed on the side end of the extension plate (102), and the protrusion is limited sliding in the internal arc groove of the first cover shell (4).

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