Dust removal device

Abstract

The utility model provides a dust removal device, and relates to the field of battery surface dust removal. The dust removal device is used for removing dust on the surface of a battery, and comprises a main body which is provided with an internal space and comprises a first side wall and a second side wall, and the first side wall directly faces the second side wall; a mounting unit configured to fix the battery, the mounting unit being disposed in the internal space; the air blowing unit is configured to generate wind energy to blow dust on the surface of the battery out of the internal space through a rotating plate arranged on the first side wall, the air blowing unit is arranged on the second side wall, and the rotating plate is configured to be opened towards the outside; and the cleaning unit is configured to remove dust on the surface of the battery, and the cleaning unit is arranged in the internal space. In the using process, dust on the surface of the battery is removed through strong wind, and the dust is discharged out of the dust removing device through the dust discharging opening formed in the other side wall. The battery rotates in the horizontal direction and cooperates with the cleaning unit to enhance the dust removal effect on the surface of the battery; the device is simple in structure, low in cost and suitable for large-scale mass production.

Description

Technical Field

[0001] The present application relates to the technical field of battery surface dust removal, and in particular to a dust removal device. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Dust on the surface of lithium batteries may affect the battery's conductivity and contact resistance, thereby affecting the battery's performance. In addition, impurities in the dust may react adversely with the lithium metal or electrolyte on the battery surface, causing reactions inside the battery, affecting the battery's life and safety.

[0003] In the prior art, a dust removal device is generally used to remove dust on the surface of the battery; however, the existing dust removal device has two disadvantages: high cost or difficulty in effectively removing dust on the surface of the battery. Therefore, how to design the mechanism of the dust removal device to optimize the efficiency of dust removal on the surface of the battery is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present application provides a dust removal device to optimize the dust removal efficiency on the battery surface.

[0005] In a first aspect, the present application provides a dust removal device for removing dust from the surface of a battery, comprising: a main body, having an internal space, comprising a first side wall and a second side wall, the first side wall being opposite to the second side wall; an installation unit, configured to fix the battery, the installation unit being disposed in the internal space; a blowing unit, configured to generate wind energy to blow dust from the surface of the battery out of the internal space through a rotating plate disposed on the first side wall, the blowing unit being disposed on the second side wall, the rotating plate being configured to open toward the outside; a cleaning unit, configured to remove dust from the surface of the battery, the cleaning unit being disposed in the internal space.

[0006] Optionally, the mounting unit includes a first motor; the first motor is configured to drive the mounting unit to rotate in a horizontal direction.

[0007] Optionally, the mounting unit also includes: a mounting base plate, the first surface of the mounting base plate having an arc groove and a concave portion, a plurality of arc sliders being arranged in the arc groove, and the first motor being arranged in the concave portion; a placement plate, configured to fix the battery, the placement plate being arranged on the plurality of arc sliders, and the bottom of the placement plate being connected to the output end of the first motor.

[0008] Optionally, the dust removal device also includes: a transmission unit, configured to control the opening or closing of the rotating plate, and the transmission unit is arranged in the internal space; the transmission unit is also configured to drive the cleaning unit to remove dust on the surface of the battery when controlling the opening or closing of the rotating plate.

[0009] Optionally, the transmission unit includes a second motor, a screw rod, a threaded column and an L-shaped connecting rod; the output end of the second motor is connected to the screw rod, the threaded column is sleeved on the screw rod, the first end point of the L-shaped connecting rod is connected to the threaded column, the second end point of the L-shaped connecting rod is connected to the rotating plate, and the L-shaped connecting rod moves toward the rotating plate when the second motor is working to open the rotating plate.

[0010] Optionally, the transmission unit further includes: a guide rod configured to limit the moving path of the threaded column, the guide rod is parallel to the screw rod, and the guide rod passes through the threaded column.

[0011] Optionally, the cleaning unit includes: a brush plate configured to remove dust on the surface of the battery, and the brush plate is connected to the third end point of the L-shaped connecting rod.

[0012] Optionally, the rotating plate is connected to the first side wall via a rotating shaft; the rotating plate includes a sliding groove and a sliding block arranged in the sliding groove, and the second end point of the L-shaped connecting rod is connected to the sliding block.

[0013] Optionally, the main body further includes a top cover, and the upper portion of the top cover includes a handle.

[0014] Optionally, the main body also includes a third side wall and a fourth side wall, and the dust removal device also includes: a first locking member, a second locking member and a limiting rod; the first locking member is arranged on the third side wall, the second locking member is arranged on the fourth side wall, the limiting rod is arranged on the upper part of the top cover, and the two ends of the limiting rod are respectively connected to the first locking member and the second locking member.

[0015] During use of the above structure, the blowing unit provides strong wind to remove dust from the surface of the battery, and a dust discharge port can be formed by a rotating plate arranged on the other side wall opposite to the blowing unit to directly discharge the dust from the internal space of the dust removal device; and the battery is driven by a motor to rotate in the horizontal direction, which can further enhance the dust removal effect on the battery surface in conjunction with the cleaning unit; in addition, the structure of the present application is simple and the cost is low, so it is suitable for large-scale mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief introduction to the drawings used in describing the embodiments of the present application:

[0017] Figure 1 It is a structural schematic diagram of a dust removal device provided in an embodiment of the present application;

[0018] Figure 2 is a schematic structural diagram of another dust removal device provided in an embodiment of the present application;

[0019] Figure 3 is a structural schematic diagram of another dust removal device provided in an embodiment of the present application;

[0020] Figure 4 It is a structural schematic diagram of another dust removal device provided in an embodiment of the present application.

[0021] In the figure: 100-dust removal device, 110-installation unit, 120-blowing unit, 130-rotating plate, 140-cleaning unit, 150-transmission unit, 111-first motor, 112-installation base plate, 113-arc-shaped slider, 114-placing plate, 141-brush plate, 151-second motor, 152-screw rod, 153-threaded column, 154-L-shaped connecting rod, 160-handle, 170-first locking member, 180-second locking member, 190-limiting rod. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other accompanying drawings and other implementation methods can be obtained based on these drawings without creative work. Adjustments and improvements made without departing from the concept of the present application are all within the scope of protection of the present application.

[0023] In order to simplify the drawings, only the parts related to the corresponding embodiments are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, only part of the components with the same structure or function in some figures are schematically drawn, and there may be more or fewer components with the same structure or function in reality.

[0024] In this application, unless otherwise clearly specified and limited, ordinal numbers, such as "first", "second", etc., are only used to distinguish and describe associated objects, and cannot be understood as indicating or implying the relative importance or order between associated objects; in addition, they do not represent the number of associated objects. "Multiple" includes two or more, and other quantifiers are similar. " / " is used to describe the relationship between associated objects, which indicates the "or" relationship between associated objects. "And / or" is used to describe the relationship between associated objects, which includes any combination relationship between associated objects, such as "a and / or b" includes: "alone a", "alone b", or "a and b". "One or more" or "at least one" in multiple objects refers to any object or any combination of multiple objects, such as "one or more of a1, a2, a3" or "at least one of a1, a2, a3" includes: "alone a1", "alone a2", "alone a3", "a1 and a2", "a1 and a3", "a2 and a3", or "a1, a2 and a3".

[0025] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. In recent years, lithium batteries have been widely used in various fields due to their good safety performance, high energy density, light weight, long life and low self-discharge. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have now become mainstream. In the daily use of lithium batteries, in order to stabilize battery performance, prevent chemical reactions, improve safety and product quality, and prevent battery aging, dust removal on the battery surface is a key step.

[0026] Existing battery dust removal devices may require complex mechanical structures and high-precision control systems so that dust can be effectively removed without damaging the battery surface. Such complex equipment generally requires high-cost design, manufacturing and maintenance. Moreover, since lithium batteries have high requirements for cleanliness, dust removal equipment has high requirements for precision so that dust can be completely removed, which may require expensive components such as high-end sensors and precision actuators. In addition, in order to avoid damage to the surface of lithium batteries, the material selection of dust removal devices is also very particular, and some high-cost materials may need to be used to make them. It can be seen that the cost of existing battery dust removal devices is high and is not conducive to large-scale production. On the other hand, since dust may be firmly attached to the surface of lithium batteries through electrostatic force or other means, ordinary dust removal methods are difficult to effectively remove. Moreover, there may be some tiny bumps or other complex shapes on the surface of lithium batteries, which makes it easy for dust to accumulate in these difficult-to-reach locations, increasing the difficulty of dust removal. In addition, the surface of lithium batteries may absorb more dust due to the electrostatic effect, and the electrostatic interaction between these dust and the surface makes it difficult to be removed by ordinary mechanical or airflow dust removal methods. It can be seen that the existing battery dust removal device is not easy to clean the dust attached to the surface of the battery.

[0027] Based on the above discussion, the present application improves the dust removal capacity by cleverly designing the internal structure of the dust removal device, thereby reducing the manufacturing cost of the dust removal device and optimizing the dust removal efficiency on the battery surface.

[0028] Please refer to Figure 1 , which shows a schematic diagram of the structure of a dust removal device provided in an embodiment of the present application. Figure 1 As shown, the dust removal device 100 is used to remove dust on the surface of the battery, including: a main body, having an internal space, including a first side wall and a second side wall, the first side wall is opposite to the second side wall, for example Figure 1In the figure, the first side wall is represented as the side wall on the left side, and the second side wall is represented as the side wall on the right side; the mounting unit 110 is configured to fix the battery, and the mounting unit 110 is arranged in the internal space. During the dust removal process, the battery to be dusted will be fixed on the mounting unit 110; the blowing unit 120 is configured to generate wind energy to blow the dust on the surface of the battery out of the internal space through the rotating plate 130 arranged on the first side wall, and the blowing unit 120 is arranged on the second side wall, and the rotating plate 130 is configured to open toward the outside, that is, Figure 1 The rotating plate 130 shown is opened in the direction away from the first side wall; the cleaning unit 140 is configured to remove dust from the surface of the battery. The cleaning unit 140 is arranged in the internal space, and the lower surface of the cleaning unit 140 can be in contact with the upper surface of the battery; the cleaning unit 140 can be designed to be in a fixed state, and the battery and the cleaning unit 140 can be moved relative to each other by the movement of the battery to remove dust from the surface of the battery, or the battery can be kept fixed, and the cleaning unit 140 can be moved relative to each other by the movement of the cleaning unit 140 to remove dust from the surface of the battery, or the battery and the cleaning unit 140 can be moved together, and the dust on the surface of the battery can be removed by the relative movement between the two.

[0029] During the use of the dust removal device, the battery to be dusted is first fixed on the mounting unit 110, and then the blowing unit 120 is started to use wind energy to remove dust on the surface of the battery. Compared with other dust removal methods, using wind energy to remove dust can reduce the impact on the battery surface. During the blowing process, the rotating plate 130 located on the first side wall is opened, so that the dust can be directly discharged from the rotating plate 130 to the internal space of the dust removal device 100, thereby improving the cleanliness of the internal space and preventing the dust blown off by the wind from reattaching to the battery surface due to factors such as static electricity. In addition, such a design can reduce the time used to clean the internal space of the dust removal device 100 after the dust removal is completed. For the dust removal device in the prior art, even if it also has a design similar to the blowing unit in this embodiment, most of the dust blown off is accumulated inside the dust removal device, so it takes a certain amount of time to clean the internal space of the dust removal device after use, which undoubtedly reduces the efficiency of the entire battery dust removal process. The rotating plate 130 can be opened by an additional external control, or can be opened by setting a transmission structure inside the dust removal device 100, or when the wind energy provided by the blowing unit 120 is large enough, the rotating plate 130 can be opened directly by wind energy. Exemplarily, the blowing unit 120 can be a blower or a fan. In addition, the cleaning unit 140 can also remove dust on the surface of the battery by relative motion with the battery.

[0030] During use of the above structure, the blowing unit provides strong wind to remove dust from the surface of the battery, and a dust discharge port can be formed by a rotating plate arranged on the other side wall opposite to the blowing unit to directly discharge the dust into the internal space of the dust removal device, thereby improving the efficiency of dust removal; in addition, the structure disclosed in this embodiment is relatively simple and low in cost, and there are no special requirements for the materials of each component, so it is suitable for large-scale mass production.

[0031] In some embodiments, please refer to Figure 2 , which shows a schematic diagram of the structure of another dust removal device provided in an embodiment of the present application. Figure 2 As shown, the mounting unit 110 includes a first motor 111 ; the first motor 111 is configured to drive the mounting unit 110 to rotate in a horizontal direction.

[0032] The first motor 111 drives the mounting unit 110 to rotate in the horizontal direction, so that the battery fixed on the mounting unit 110 also rotates with the mounting unit 110. During the rotation process, the battery and the surfaces in contact with the cleaning unit 140 move relative to each other, so that the cleaning unit 140 can remove dust on these surfaces. In addition, during the rotation process, the wind energy provided by the blowing unit 120 can act on all sides of the battery, thereby reducing the dust removal blind spots and improving the cleaning ability of the dust removal device.

[0033] In some embodiments, please continue to refer to Figure 2 The mounting unit 110 further includes: a mounting base plate 112, wherein the first surface of the mounting base plate 112 has an arc-shaped groove and a concave portion, a plurality of arc-shaped sliders 113 are arranged in the arc-shaped groove, and the first motor 111 is arranged in the concave portion; a placement plate 114, which is configured to fix the battery, and the placement plate 114 is arranged on the plurality of arc-shaped sliders 113, and the bottom of the placement plate 114 is connected to the output end of the first motor 111.

[0034] Through the above connection method, the placement plate 114 and the battery fixed on the placement plate 114 can be rotated in the horizontal direction by driving the first motor 111. The arc groove on the first surface of the mounting base plate 112 is equivalent to the rotation track of the placement plate 114, which determines the rotation track of the placement plate 114; the setting of the arc slider 113 helps to reduce the friction between the mounting base plate 112 and the placement plate 114 during the rotation process, and increase the stability and service life of the device. The size of the first motor 111 matches the concave part of the first surface of the mounting base plate 112, so that the distance between the placement plate 114 and the mounting base plate 112 is within an appropriate range.

[0035] In some embodiments, please continue to refer to Figure 1The dust removal device 100 also includes: a transmission unit 150, which is configured to control the opening or closing of the rotating plate 130, and the transmission unit 150 is arranged in the internal space; the transmission unit 150 is also configured to drive the cleaning unit 140 to remove dust on the surface of the battery when controlling the opening or closing of the rotating plate 130.

[0036] By controlling the opening or closing of the rotating plate 130 through the transmission unit 150, the opening timing of the rotating plate 130 can be controlled more stably compared to the wind energy provided by the blowing unit 120, so that the dust attached to the surface of the battery and the dust inside the dust removal device 100 can be more effectively discharged from the internal space of the dust removal device 100, thereby improving the dust removal efficiency. Figure 1 As shown, there is a certain connection relationship between the transmission unit 150 and the cleaning unit 140, which can make the cleaning unit 140 produce a certain displacement while controlling the opening or closing of the rotating plate 130; in this way, relative movement can be generated between the cleaning unit 140 and the surface of the battery, which is conducive to removing dust on the surface of the battery and further improving the efficiency of dust removal. Such a structural design allows the transmission unit 150 to realize multiple functions at the same time, and each function does not affect each other; the functions of the original multiple units are integrated into one, reducing the manufacturing cost of the dust removal device 100.

[0037] In some embodiments, the connection method of the transmission unit 150 is provided. Figure 3 , which shows a structural schematic diagram of another dust removal device provided in an embodiment of the present application, Figure 3 Performance Figure 1 The partial image schematic diagram highlights the details of the transmission unit 150, the cleaning unit 140 and the rotating plate 130. The contents related to the installation unit and the blowing unit can refer to the above embodiments and will not be repeated here. Figure 3 As shown, the transmission unit 150 includes a second motor 151, a screw rod 152, a threaded column 153 and an L-shaped connecting rod 154; the output end of the second motor 151 is connected to the screw rod 152, the threaded column 153 is sleeved with the screw rod 152, the first end of the L-shaped connecting rod 154 is connected to the threaded column 153, the second end of the L-shaped connecting rod 154 is connected to the rotating plate 130, and the L-shaped connecting rod 154 moves toward the rotating plate 130 when the second motor 151 is working to open the rotating plate 130. Further, the cleaning unit 140 includes: a brush plate 141, which is configured to remove dust on the surface of the battery, and the brush plate 141 is connected to the third end of the L-shaped connecting rod 154. The setting of the brush plate can enable the cleaning unit to cover a larger area range of the battery surface, thereby achieving a better cleaning effect.

[0038] In the above structure, when the second motor 151 is started, the screw rod 152 is driven to rotate; because the threaded column 153 is sleeved and connected to the screw rod 152, the rotation of the screw rod 152 will drive the threaded column 153 to move forward and backward along the direction of the screw rod 152; and because the L-shaped connecting rod 154 is connected to the threaded column 153, the L-shaped connecting rod 154 moves in the direction of the rotating plate 130 when the second motor 151 is working, so that the rotating plate 130 is opened. After the rotating plate 130 is opened, an ash discharge port is formed on the first side wall, so that the dust inside the dust removal device 100 can be discharged from the internal space through the ash discharge port to improve the cleanliness of the internal space. The operation of the above transmission unit 150 is realized by the drive of the second motor 151, and no additional power intervention is required, thereby saving the cost of the dust removal process.

[0039] In some embodiments, please continue to refer to Figure 3 The transmission unit 150 further includes: a guide rod 155 configured to limit the moving path of the threaded column 153 , the guide rod 155 is parallel to the screw rod 152 , and the guide rod 155 passes through the threaded column 153 .

[0040] The setting of the guide rod 155 can further guide the linear motion of the threaded column 153, so that the threaded column 153 moves smoothly and accurately along a specific path. The moving path of the threaded column 153 is limited by the surface formed by the screw rod 152 and the guide rod 155, which can improve the safety of the dust removal process and prevent the threaded column 153 from being misplaced during the movement process, resulting in structural damage.

[0041] In some embodiments, please continue to refer to Figure 3 The rotating plate 130 is connected to the first side wall through a rotating shaft; the rotating plate 130 includes a slide groove and a slider arranged in the slide groove, and the second end point of the L-shaped connecting rod 154 is connected to the slider.

[0042] For the entire dust removal device, the internal dust is blown up through the blowing unit (blower), and then the second motor is driven to start. With the cooperation of the screw rod, threaded column, L-shaped connecting plate, slider, slide groove and guide rod, the rotating plate is rotated and unfolded around the rotating shaft. The unfolded rotating plate forms an ash discharge port to discharge the dust. At the same time, in conjunction with the first motor, the arc-shaped slider at the bottom of the placement plate is driven to move in the arc-shaped slide groove, thereby rotating the battery. In conjunction with the cleaning unit (brush plate), the dust on the surface of the battery can be cleaned, further increasing the cleaning effect and forming a comprehensive cleaning without dead ends. The above structure does not involve complex components and has a simple structure, so the cost is relatively low.

[0043] In some embodiments, please refer to Figure 4 , which shows a schematic diagram of the structure of another dust removal device provided in an embodiment of the present application. Figure 4As shown, the main body also includes a top cover, and the upper part of the top cover includes a handle 160. Further, the main body also includes a third side wall and a fourth side wall, which are different from Figure 1 The first side wall and the second side wall shown in Figure 4 The side wall with the rotating plate is the first side wall, the side wall to the right of the first side wall is the third side wall, and the side wall opposite to the third side wall is the fourth side wall. The dust removal device 100 further includes: a first locking member 170, a second locking member 180, and a limiting rod 190; the first locking member 170 is arranged on the third side wall, the second locking member 180 is arranged on the fourth side wall, the limiting rod 190 is arranged on the upper part of the top cover, and the two ends of the limiting rod 190 are respectively connected to the first locking member 170 and the second locking member 180. The shape and appearance of the second locking member 180 are consistent with the first locking member 170.

[0044] As can be seen from the figure, the dust removal device 100 can be designed as a box-type structure as a whole, and a handle 160 is included on the upper part of the top cover, so that it is easy to carry. The first locking member 170, the second locking member 180 and the limit rod 190 can fix the overall structure during the dust removal process to avoid accidents such as falling apart. Figure 4 The first locking member 170, the second locking member 180 and the limiting rod 190 are regarded as a set of fixed structures. When designing the dust removal device 100, multiple sets of similar fixed structures can be designed, for example Figure 4 The two sets of fixing structures shown. The fixing structures are located on the third side wall and the fourth side wall, staggered with the first side wall where the rotating plate is located and the second side wall where the blowing unit is located, so that the structure is clear and will not interfere with each other. Before the dust removal begins, the top cover can be opened and the battery to be dusted can be placed in the internal space of the dust removal device 100. Furthermore, a plurality of fixings can be provided at the bottom of the dust removal device 100 so that the dust removal device 100 can be fixed during the dust removal process.

[0045] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. In addition, the above embodiments can be freely combined as needed.

Claims

1. A dust removal device, characterized in that: Used to remove dust from the battery surface, including: A main body having an inner space, including a first side wall and a second side wall, wherein the first side wall is opposite to the second side wall; An installation unit configured to fix the battery, the installation unit being disposed in the internal space; a blowing unit, configured to generate wind energy to blow dust on the surface of the battery out of the internal space through a rotating plate arranged on the first side wall, the blowing unit is arranged on the second side wall, and the rotating plate is configured to open toward the outside; The cleaning unit is configured to remove dust on the surface of the battery, and the cleaning unit is arranged in the internal space.

2. The dust removal device according to claim 1, characterized in that: The mounting unit includes a first motor; The first motor is configured to drive the mounting unit to rotate in a horizontal direction.

3. The dust removal device according to claim 2, characterized in that: The installation unit also includes: A mounting base plate, wherein a first surface of the mounting base plate has an arc-shaped groove and an inner concave portion, a plurality of arc-shaped sliders are arranged in the arc-shaped groove, and the first motor is arranged in the inner concave portion; A placement plate is configured to fix the battery, the placement plate is arranged on the plurality of arc-shaped sliders, and the bottom of the placement plate is connected to the output end of the first motor.

4. The dust removal device according to claim 1, characterized in that: Also includes: a transmission unit, configured to control the rotating plate to open or close, wherein the transmission unit is disposed in the internal space; The transmission unit is further configured to drive the cleaning unit to remove dust on the surface of the battery when controlling the rotating plate to open or close.

5. The dust removal device according to claim 4, characterized in that: The transmission unit includes a second motor, a screw rod, a threaded column and an L-shaped connecting rod; The output end of the second motor is connected to the screw rod, the threaded column is sleeved with the screw rod, the first end point of the L-shaped connecting rod is connected to the threaded column, the second end point of the L-shaped connecting rod is connected to the rotating plate, and the L-shaped connecting rod moves toward the rotating plate when the second motor is working to open the rotating plate.

6. The dust removal device according to claim 5, characterized in that: The transmission unit also includes: The guide rod is configured to limit the moving path of the threaded column, the guide rod is parallel to the screw rod, and the guide rod passes through the threaded column.

7. The dust removal device according to claim 5, characterized in that: The cleaning unit comprises: A brush plate is configured to remove dust from the surface of the battery, and the brush plate is connected to the third end point of the L-shaped connecting rod.

8. The dust removal device according to claim 5, characterized in that: The rotating plate is connected to the first side wall via a rotating shaft; The rotating plate comprises a sliding groove and a sliding block arranged in the sliding groove, and the second end point of the L-shaped connecting rod is connected to the sliding block.

9. The dust removal device according to claim 1, characterized in that: The main body further comprises a top cover, and an upper portion of the top cover comprises a handle.

10. The dust removal device according to claim 9, characterized in that: The main body further includes a third side wall and a fourth side wall, and the dust removal device further includes: a first locking member, a second locking member and a limiting rod; The first locking member is arranged on the third side wall, the second locking member is arranged on the fourth side wall, the limiting rod is arranged on the upper part of the top cover, and the two ends of the limiting rod are respectively connected to the first locking member and the second locking member.

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