Inspection machine

Abstract

The application relates to an inspection machine, comprising a box assembly, a general substrate assembly and a plurality of second fasteners, wherein a bottom wall of the box assembly is provided with a plurality of mounting holes, the general substrate assembly is arranged in the box assembly and comprises a plurality of circuit boards arranged in layers, the circuit board at the bottom layer is connected with the plurality of first fasteners, at least part of each second fastener is arranged outside the box assembly, the first fastener and one of the corresponding second fasteners are connected with the other one through the mounting hole, when the circuit board at the bottom layer of the general substrate assembly fails, the second fastener can be detached from the first fastening assembly outside the box assembly, so that the general substrate assembly and the first fastener can be integrally detached from the box assembly, and the circuit board at the bottom layer can be conveniently maintained, without sequentially and individually removing each circuit board from the top of the box assembly, so that the operation process can be greatly shortened, the maintenance cost can be reduced, and the maintenance efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of product testing technology, and in particular to an inspection machine. Background Technology

[0002] With the development of technology, the technical requirements for electronic products are getting higher and higher, especially the clarity of display modules, which poses a greater challenge. However, in order to ensure that the manufactured display modules are free of defects and that the clarity reaches the expected level, inspection machines are essential for testing them.

[0003] Typically, inspection machines contain multiple circuit boards, which are assembled in layers and stacked sequentially to form the complete operating system of the inspection machine. The bottom circuit board is fixedly connected to the machine. However, when the bottom circuit board malfunctions, repairs require disassembling each circuit board from top to bottom before repairing the bottom one. This results in a lengthy process, significantly increasing repair costs and reducing efficiency. Utility Model Content

[0004] In view of this, and in response to the aforementioned problems that exist when existing inspection machines malfunction and require repair, this application provides an inspection machine that aims to reduce repair costs and improve repair efficiency.

[0005] According to one aspect of this application, an inspection machine is provided, comprising:

[0006] A housing assembly, wherein the bottom wall of the housing assembly has a plurality of mounting holes;

[0007] A main substrate assembly is disposed within the housing assembly. The main substrate assembly includes several stacked circuit boards, and the bottommost circuit board is connected to a plurality of first fasteners.

[0008] A plurality of second fasteners correspond one-to-one with a plurality of first fasteners, at least a portion of each second fastener being disposed outside the housing assembly, wherein one of the first fasteners and the corresponding second fastener passes through the mounting hole and is connected to the other, so that the main base plate assembly is fixed inside the housing assembly.

[0009] In one embodiment, the stacked circuit boards include a power substrate at the bottom layer and a signal board group on top of the power substrate. The signal board group is electrically connected to the power substrate. A first fastener is disposed on the side of the power substrate facing away from the signal board group. A plurality of third fasteners corresponding one-to-one with the first fastener are disposed between the power substrate and the signal board group. One end of the third fastener is connected to the power substrate and the corresponding first fastener, and the other end is connected to the signal board group.

[0010] In one embodiment, the signal board assembly includes a main signal board and a secondary signal board. The main signal board and the secondary signal board are stacked and interconnected by a plurality of fourth fasteners that correspond one-to-one with the third fasteners. One end of the fourth fastener is connected to the main signal board and the secondary signal board that is closer to the power supply substrate and is connected to the corresponding third fastener. The other end of the fourth fastener is connected to the main signal board and the secondary signal board that is farther away from the power supply substrate.

[0011] In one embodiment, the main signal board and the secondary signal board are partially stacked and interconnected by a fourth fastener. One end of the fourth fastener is connected to the one of the main signal board and the secondary signal board that is closer to the power supply substrate and is connected to the corresponding third fastener. The other end of the fourth fastener is connected to the one of the main signal board and the secondary signal board that is farther away from the power supply substrate.

[0012] The remaining parts of the main signal board and the remaining parts of the secondary signal board are stacked on the power supply substrate and are connected to the power supply substrate by the remaining third fasteners.

[0013] In one embodiment, a fifth fastener is provided on the one of the main signal board and the secondary signal board that is away from the power supply substrate. The fifth fastener connects the main signal board and the one of the secondary signal boards that is away from the power supply substrate, and is connected to the fourth fastener.

[0014] The main signal board is further provided with a sixth fastener, which is connected to the main signal board and connected to the corresponding third fastener; the secondary signal board is further provided with a seventh fastener, which is connected to the secondary signal board and connected to the corresponding third fastener.

[0015] In one embodiment, the housing assembly is provided with a relay board assembly that is electrically connected to the power supply board and communicatively connected to the signal board group, and the relay board assembly is provided with a plurality of interfaces for connecting the product being inspected.

[0016] In one embodiment, the housing assembly has multiple heat dissipation holes that connect its interior and exterior.

[0017] In one embodiment, the housing assembly includes a fan.

[0018] In one embodiment, the housing assembly includes an upper housing and a lower housing that are detachably connected to each other. The upper housing covers the lower housing and forms a receiving cavity. The main base plate assembly is disposed in the receiving cavity and fixedly connected to the lower housing.

[0019] In one embodiment, at least one side of the lower housing has a first side plate, the remaining sides of the lower housing have a first opening, at least one side of the upper housing has a second side plate, the remaining sides of the lower housing have a second opening, the first side plate corresponds to and closes the second opening, and the second side plate corresponds to and closes the first opening.

[0020] The aforementioned inspection machine, by having at least a portion of the second fastener located outside the housing assembly, and one of the first fastener and the corresponding second fastener passing through a mounting hole in the housing assembly and connecting to the other, allows the main substrate assembly to be fixed inside the housing assembly. When a fault occurs in the circuit board at the bottom layer of the main substrate assembly, the second fastener can be removed from the first fastening assembly from outside the housing assembly, thereby allowing the main substrate assembly and the first fastener to be disassembled together from inside the housing assembly. This facilitates the repair of the circuit board at the bottom layer without having to remove each circuit board one by one from the top of the housing assembly, thus significantly shortening the operation process, reducing repair costs, and improving repair efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the appearance of an inspection machine provided in one embodiment of this application.

[0022] Figure 2 An explosion diagram of an inspection machine provided in an embodiment of this application. Figure 1 .

[0023] Figure 3 An explosion diagram of an inspection machine provided in an embodiment of this application. Figure 2 .

[0024] Figure 4 for Figure 2 An enlarged schematic diagram of region A in the middle.

[0025] Figure 5 An exploded view of an inspection machine provided in a revised embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Inspection machine; 100. Cabinet assembly; 100a. Heat dissipation hole; 110. Upper cabinet; 111. First side panel; 112. First opening; 120. Lower cabinet; 121. Second side panel; 122. Second opening; 200. Main baseboard assembly; 210. Power supply baseboard; 220. Signal board assembly; 221. Main signal board; 222. Secondary signal board; 230. First fastener; 240. Third fastener; 250. Fourth fastener; 260. Fifth fastener; 270. Sixth fastener; 280. Seventh fastener; 300. Relay baseboard assembly; 400. Second fastener; 500. Fan. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] One embodiment of this application provides an inspection machine for checking and testing the functionality of electronic products before they leave the factory, so as to ensure that the electronic products are qualified products when they reach the user after leaving the factory.

[0035] The structure of the inspection machine in this application will be described below using an electronic product as an example of a display module. This embodiment is only used as an example and does not limit the technical scope of this application. It is understood that in other embodiments, the inspection machine of this application is not limited to inspecting display module products, but can inspect any other electronic product, and is not limited here.

[0036] See Figure 1 and Figure 2 , Figure 1 This paper shows a schematic diagram of the appearance of an inspection machine 10 provided in one embodiment of the present application. Figure 3An exploded view of an inspection machine 10 according to an embodiment of this application is shown. The inspection machine 10 provided in this embodiment includes a housing assembly 100, a main base plate assembly 200, and a relay base plate assembly 300. The main base plate assembly 200 is disposed within the housing assembly 100, and the relay base plate assembly 300 is disposed on the housing assembly 100 and communicatively connected to the main base plate assembly 200. The main base plate assembly 200 includes several stacked circuit boards. The bottommost circuit board is connected to the bottom wall of the housing assembly 100 via a first fastener 230 to secure it within the housing assembly 100. The main base plate assembly 200 is used for signal processing of the inspection machine 10, and the relay base plate assembly 300 is used to connect to the product being inspected and to relay signals. The main base plate assembly 200 and the relay base plate assembly 300 together constitute the complete operating system of the inspection machine 10.

[0037] Specifically, in one embodiment, such as Figure 2 and Figure 3 As shown, the housing assembly 100 includes an upper housing 110 and a lower housing 120 that are detachably connected to each other. The upper housing 110 covers the lower housing 120 and together they form a receiving cavity. The main base plate assembly 200 is disposed in the receiving cavity and fixedly connected to the lower housing 120, and the relay base plate assembly 300 is connected to the upper housing 110. Figure 3 In one embodiment, the lower housing 120 has first side plates 111 on its adjacent sides, and the other two adjacent sides of the lower housing 120 have first openings 112; the upper housing 110 has second side plates 121 on its adjacent sides, and the other two adjacent sides of the lower housing 120 have second openings 122. The first side plates 111 correspond to and close the second openings 122, and the second side plates 121 correspond to and close the first openings 112, so as to form a closed receiving cavity.

[0038] It is understood that the structure of the upper box 110 and the lower box 120 is not limited to the structure shown in the embodiment in the figure. For example, the box assembly 100 is not limited to having only four sides, and the upper box 110 is not limited to having a first side plate 111 on two adjacent sides, as long as at least one side has a first side plate 111. Similarly, the lower box 120 is not limited to having a second side plate 121 on two adjacent sides, as long as at least one side has a second side plate 121, and the first side plate 111 and the second side plate 121 can jointly close the first opening 112 and the second opening 122.

[0039] It is also understood that the lower box 120 may have a first side plate 111 on all four sides, so that the top of the lower box 120 is open, and the upper box 110 may be just a cover plate that closes the top opening of the lower box 120. Alternatively, the upper box 110 may have a second side plate 121 on all four sides, so that the bottom of the upper box 110 is open, and the lower box 120 may be just a bottom plate that closes the bottom opening of the upper box 110. There are no limitations on these possibilities.

[0040] Regarding the specific structure of the total substrate assembly 200, such as Figure 2 , Figure 3 and Figure 4 As shown, the total substrate assembly 200 comprises several stacked circuit boards, including a power supply substrate 210 at the bottom and a signal board assembly 220 above the power supply substrate 210. The signal board assembly 220 is electrically connected to the power supply substrate 210, and the relay substrate assembly 300 is electrically connected to the power supply substrate 210 and communicatively connected to the signal board assembly 220. The power supply substrate 210 in the total substrate assembly 200 provides power to the signal board assembly 220 and the relay substrate assembly 300, while the signal board assembly 220 performs signal processing. The power supply board 210 is connected to the bottom wall of the housing assembly 100 (i.e., the lower housing 120) by a plurality of first fasteners 230. A plurality of third fasteners 240 corresponding one-to-one with the first fasteners 230 are provided between the signal board assembly 220 and the power supply board 210. One end of the third fastener 240 is connected to the power supply board 210 and the corresponding first fastener 230, and the other end is connected to the signal board assembly 220, so that the power supply board 210 and the bottom wall of the housing assembly 100 are fixed to each other, and the signal board assembly 220 and the power supply board 210 are fixedly connected to each other.

[0041] Optionally, both the first fastener 230 and the third fastener 240 are studs, one of which is inserted through the power supply board 210 and connected to the other of the first fastener 230 and the third fastener 240.

[0042] Further, in some embodiments, the signal board assembly 220 includes a main signal board 221 and a secondary signal board 222, which are used to process different signals respectively. In the embodiment shown in the figure, the main signal board 221 and the secondary signal board 222 are partially stacked and interconnected by a fourth fastener 250. In the figure, the main signal board 221 is located above the secondary signal board 222, that is, the main signal board 221 is farther away from the power supply substrate 210 than the secondary signal board 222. One end of the fourth fastener 250 is connected to the secondary signal board 222 and to a third fastener 240, and the other end of the fourth fastener 250 is connected to the main signal board 221. The remaining parts of the main signal board 221 and the remaining parts of the secondary signal board 222 are stacked with the power supply substrate 210 and are connected to the power supply substrate 210 by the remaining third fasteners 240. Similarly, the fourth fastener 250 can also be a stud.

[0043] Furthermore, to ensure that the main signal board 221, the secondary signal board 222, and the power supply board 210 are fixed together, such as... Figure 3 and Figure 4 As shown, the main signal board 221 is provided with a fifth fastener 260, which connects to the main signal board 221 and is connected to the fourth fastener 250, preventing the main signal board 221 from becoming detached from the secondary signal board 222. The main signal board 221 is also provided with a sixth fastener 270, which connects to the main signal board 221 and is connected to the corresponding third fastener 240, preventing the main signal board 221 from becoming detached from the power signal board. Similarly, the secondary signal board 222 is provided with a seventh fastener 280, which connects to the secondary signal board 222 and is connected to the corresponding third fastener 240. In the embodiment shown, the fifth fastener 260, the sixth fastener 270, and the seventh fastener 280 are all screws, but are not limited to these; they can also be nuts, etc., as long as they can secure the main signal board 221, the secondary signal board 222, and the power board 210 to each other.

[0044] It is understood that in other embodiments, the secondary signal board 222 may also be located above the primary signal board 221, that is, the secondary signal board 222 is farther away from the power supply substrate 210 than the primary signal board 221. Alternatively, in another embodiment, the primary signal board 221 and the secondary signal board 222 are completely stacked and connected by a plurality of fourth fasteners 250 corresponding one-to-one with the third fasteners 240. One end of the fourth fastener 250 is connected to the primary signal board 221 and the secondary signal board 222 that is closer to the power supply substrate 210 and is connected to the corresponding third fastener 240. The other end of the fourth fastener 250 is connected to the primary signal board 221 and the secondary signal board 222 that is farther away from the power supply substrate 210.

[0045] It is also understood that the total substrate assembly 200 is not limited to including only the main signal board 221, the secondary signal board 222 and the power supply board 210, but may also include more circuit boards, which is not limited here.

[0046] As can be seen from the above embodiments, the inspection machine 10 in the above embodiments has a layered assembly structure. Figure 3 In the top-to-bottom direction, the inspection machine 10 is assembled by stacking the relay board assembly 300, upper housing 110, main signal board 221, secondary signal board 222, power supply board 210, and lower housing 120 in that order. It is worth noting that when the power supply board 210 malfunctions and needs repair, due to the aforementioned stacked assembly structure, the relay board assembly 300, upper housing 110, main signal board 221, and secondary signal board 222 must be removed sequentially from top to bottom to facilitate the repair of the power supply board 210. This results in a long operation process, which not only significantly increases the repair cost but also reduces the repair efficiency.

[0047] Therefore, in order to solve this problem, the applicant thought that the above structure could be improved so that the entire main board assembly 200 and the lower cover plate can be disassembled after the relay board assembly 300 and the upper cover plate are removed, thereby facilitating the maintenance of the power board 210 located at the bottom of the main board assembly 200.

[0048] Specifically, based on the above embodiments, as an improved embodiment, such as... Figure 5 As shown, the bottom wall of the housing assembly 100 (i.e. the bottom wall of the lower housing 120) is provided with mounting holes corresponding to the number of the plurality of first fasteners 230, and the inspection machine 10 also includes second fasteners 400 corresponding one-to-one with the plurality of first fasteners 230. At least a portion of each second fastener 400 is provided outside the housing assembly 100. One of the first fasteners 230 and the corresponding second fastener 400 passes through the mounting hole and is connected to the other, so that the main base plate assembly 200 is fixed inside the housing assembly 100. For example, the first fastener 230 may be a stud with a threaded hole at one end, and the second fastener 400 may be a screw that passes through the mounting hole from the outside of the housing assembly 100 and is inserted into the threaded hole to be threadedly connected to the first fastener 230; or the first fastener 230 may have a screw at the end away from the power board 210, and the second fastener 400 may be a nut that passes through the mounting hole from the inside of the housing assembly 100 and extends to the outside of the housing assembly 100, and the nut may be fitted onto the screw to be threadedly connected to the first fastener 230.

[0049] Thus, it can be seen that since at least a portion of the second fastener 400 is located outside the housing assembly 100, when the power board 210 malfunctions, after removing the second fastener 400 from the bottom of the housing assembly 100, the main board assembly 200 and the first fastener 230 can be removed together from the housing assembly 100. This makes it convenient to repair the power board 210 located at the bottom layer, without having to remove the main signal board 221 and the secondary signal board 222 one by one from the top of the housing assembly 100. Therefore, the operation process can be greatly shortened, the maintenance cost can be reduced, and the maintenance efficiency can be improved.

[0050] In addition, since the main substrate assembly 200 generates a large amount of heat during operation, in order to dissipate heat in a timely manner, such as Figure 1 As shown, the sidewalls of the housing assembly 100, namely the first sidewall of the upper housing 110 and / or the second sidewall of the lower housing 120, are provided with a plurality of heat dissipation holes 100a connecting the interior and exterior of the housing assembly 100. Heat generated by the main substrate assembly 200 during operation can be dissipated to the outside of the housing assembly 100 through the heat dissipation holes 100a. Preferably, to accelerate heat dissipation, such as... Figure 3 As shown, a fan 500 may also be provided inside the housing assembly 100. The fan 500 accelerates the airflow, thereby quickly removing heat from the heat dissipation vents 100a. The structure of the fan 500 is described in the prior art and will not be elaborated here.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An inspection machine, characterized in that, include: A housing assembly (100) has a plurality of mounting holes on its bottom wall; A main substrate assembly (200) is disposed within the housing assembly (100). The main substrate assembly (200) includes several stacked circuit boards, and the bottommost circuit board is connected to a plurality of first fasteners (230). A plurality of second fasteners (400) correspond one-to-one with a plurality of first fasteners (230), at least a portion of each second fastener (400) is disposed outside the housing assembly (100), and one of the first fasteners (230) and the corresponding second fastener (400) passes through the mounting hole and is connected to the other so that the main base plate assembly (200) is fixed inside the housing assembly (100).

2. The inspection machine according to claim 1, characterized in that, The circuit board, which is stacked in several layers, includes a power supply board (210) at the bottom layer and a signal board group (220) on the power supply board (210). The signal board group (220) is electrically connected to the power supply board (210). A first fastener (230) is provided on the side of the power supply board (210) facing away from the signal board group (220). A plurality of third fasteners (240) corresponding one-to-one with the first fastener (230) are provided between the power supply board (210) and the signal board group (220). One end of the third fastener (240) is connected to the power supply board (210) and the corresponding first fastener (230), and the other end is connected to the signal board group (220).

3. The inspection machine according to claim 2, characterized in that, The signal board assembly (220) includes a main signal board (221) and a secondary signal board (222). The main signal board (221) and the secondary signal board (222) are stacked and interconnected by a plurality of fourth fasteners (250) corresponding one-to-one with the third fastener (240). One end of the fourth fastener (250) is connected to the one of the main signal board (221) and the secondary signal board (222) that is closer to the power supply substrate (210) and is connected to the corresponding third fastener (240). The other end of the fourth fastener (250) is connected to the one of the main signal board (221) and the secondary signal board (222) that is farther away from the power supply substrate (210).

4. The inspection machine according to claim 3, characterized in that, The main signal board (221) and the secondary signal board (222) are partially stacked and connected to each other by a fourth fastener (250). One end of the fourth fastener (250) is connected to the one of the main signal board (221) and the secondary signal board (222) that is closer to the power supply board (210) and is connected to the corresponding third fastener (240). The other end of the fourth fastener (250) is connected to the one of the main signal board (221) and the secondary signal board (222) that is farther away from the power supply board (210). The remaining parts of the main signal board (221) and the remaining parts of the secondary signal board (222) are respectively stacked with the power supply substrate (210) and are respectively connected to the power supply substrate (210) through the remaining third fasteners (240).

5. The inspection machine according to claim 4, characterized in that, A fifth fastener (260) is provided on the one of the main signal board (221) and the secondary signal board (222) that is away from the power supply substrate (210). The fifth fastener (260) connects the one of the main signal board (221) and the secondary signal board (222) that is away from the power supply substrate (210) and is connected to the fourth fastener (250). The main signal board (221) is also provided with a sixth fastener (270), which is connected to the main signal board (221) and connected to the corresponding third fastener (240); the secondary signal board (222) is also provided with a seventh fastener (280), which is connected to the secondary signal board (222) and connected to the corresponding third fastener (240).

6. The inspection machine according to claim 2, characterized in that, The housing assembly (100) is provided with a relay board assembly (300) that is electrically connected to the power board (210) and communicatively connected to the signal board group (220). The relay board assembly (300) is provided with a plurality of interfaces for connecting the product being inspected.

7. The inspection machine according to claim 1, characterized in that, The housing assembly (100) has multiple heat dissipation holes (100a) that connect its interior and exterior.

8. The inspection machine according to claim 7, characterized in that, A fan (500) is provided inside the housing assembly (100).

9. The inspection machine according to claim 1, characterized in that, The housing assembly (100) includes an upper housing (110) and a lower housing (120) that are detachably connected to each other. The upper housing (110) covers the lower housing (120) and forms a receiving cavity. The main base plate assembly (200) is disposed in the receiving cavity and fixedly connected to the lower housing (120).

10. The inspection machine according to claim 9, characterized in that, The lower housing (120) has a first side plate (111) on at least one side, and the remaining sides of the lower housing (120) have a first opening (112). The upper housing (110) has a second side plate (121) on at least one side, and the remaining sides of the lower housing (120) have a second opening (122). The first side plate (111) corresponds to and closes the second opening (122), and the second side plate (121) corresponds to and closes the first opening (112).

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