Low-voltage electrician operation practical training device

Abstract

The utility model discloses a low-voltage electrician operation practical training device, which overcomes the problems that the low-voltage electrician operation practical training device in the prior art is only provided with one operating platform, cannot move, is inconvenient to use during practical operation, cannot meet all practical training requirements and is low in practical training efficiency, and comprises a device main body and universal wheels arranged at the bottom of the device main body, an operation table and a storage cabinet are arranged in the device body, an electrical part module is arranged on the operation table, the operation table comprises a main board and an auxiliary board installed below the main board, and the main board and the auxiliary board are connected through a sliding device. The operating table and the storage cabinet are integrated in one cabinet body, all necessary tools and safety equipment for practical training are effectively integrated, the operating table can extend, different practical training requirements are met, and the practical training efficiency is improved; and universal wheels are mounted on the device main body, so that the device is convenient to move, and different site requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of electrical practical examination simulation training technology, and in particular to a low-voltage electrical work training device. Background Technology

[0002] Low-voltage faults in power distribution networks are complex and diverse, and they are characterized by their suddenness and unpredictability. Upon arrival at the fault site, low-voltage power distribution repair personnel may encounter various wiring errors and faults. These personnel must be able to quickly identify, troubleshoot, and resolve the faults and restore power. Different types of faults require different handling methods, demanding that repair personnel possess solid theoretical and practical skills to quickly eliminate faults. According to relevant regulations, employees in this field should receive safety production education and training, master the safety production knowledge required for their jobs, improve their safety production skills, and enhance their accident prevention and emergency response capabilities. Therefore, electricians working in related positions must hold a valid certificate to work.

[0003] Extensive practical training is required before obtaining a low-voltage electrician's certificate, and the examination necessitates the use of low-voltage electrical work training equipment. However, most existing low-voltage electrical work training and assessment equipment consists of a panel with electrical components mounted on it and an operating table. This design is difficult to move and update, and the accessories are stored separately in a designated location. Moving the training equipment requires carrying these accessories separately, making it inconvenient to use, unsuitable for all site requirements, and resulting in low training efficiency and practicality. Furthermore, the operating table has limited width, failing to meet usage needs. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of existing low-voltage electrical work training devices, which only have one movable operating table with limited width that cannot be adjusted according to usage needs, resulting in inconvenience and low training efficiency during actual operation. This invention provides a low-voltage electrical work training device with an extendable operating table to meet different training needs and improve training efficiency. Furthermore, casters are installed on the main body of the device for easy movement and to meet different site requirements.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-voltage electrical work training device includes a main body and casters installed at the bottom of the main body. The main body is equipped with an operating table and a storage cabinet. The operating table is equipped with an electrical component module. The operating table includes a main board and a sub-board installed below the main board. The main board and the sub-board are connected by a sliding device.

[0007] The control panel and storage cabinets are integrated into one unit, effectively consolidating all necessary tools and safety equipment for practical training, meeting diverse training needs, and improving training efficiency. Casters are installed on the main body of the device for easy movement, accommodating different site requirements. Furthermore, the control panel is extendable, solving the problem of limited width that prevents adjustment according to user needs, thus improving usability.

[0008] Preferably, the sliding device includes a first slide rail mounted on the bottom of the main board and a second slide rail mounted on the upper surface of the sub-board, with a slider provided between the first slide rail and the second slide rail, and the slider being fixedly mounted on the second slide rail.

[0009] A limiting device can also be installed to fix the sub-board after it has been moved to the desired position. The limiting device can be a roller at the bottom of the sub-board leg or a slider.

[0010] Preferably, the electrical component module includes a housing mounted on the back panel of the control panel and a panel mounted on the housing. A power supply and a PCB board are installed inside the housing, and electrical components are mounted on the panel and connected to the PCB board.

[0011] Preferably, the panel is provided with an indicator light, which is connected to the PCB board, and the indicator light forms a current loop with the corresponding electrical components through the PCB board.

[0012] Preferably, the device also includes a lighting device, which includes brackets installed on the front and rear sides of the top of the device body, with a crossbeam between the brackets and an energy-saving lamp installed on the crossbeam.

[0013] Preferably, the device also includes a voltage testing device, which includes a tray mounted on an operating table. A voltage tester and a multimeter are fixed on the tray via an aviation connector, and the voltage tester and the multimeter are connected to a host computer.

[0014] Preferably, an aviation plug fastener is installed on the back panel of the control panel, and the aviation plug fastener is connected to the instrument via a spring wire.

[0015] Preferably, the system also includes a power distribution cabinet and a safety barrier, the safety barrier being equipped with safety markings.

[0016] Preferably, the main body of the device includes a base plate and a side plate mounted on the base plate. The side plate includes an aluminum profile frame and a perforated plate mounted on the aluminum profile frame. Electrical components and instruments are hung on the perforated plate.

[0017] Therefore, this utility model has the following beneficial effects:

[0018] 1. The storage cabinet and operating table are integrated into one device. The storage cabinet can be used to store various supporting items and interference items during training. Various training contents can be completed in one device without having to go to a designated location to retrieve items. It has a wide range of uses and high training efficiency.

[0019] 2. The device integrates a storage cabinet and an operating table, and is equipped with casters at the bottom, allowing it to be moved to any location. Training can be conducted using a single device in any setting, making it convenient to move and use.

[0020] 3. By setting the control panel as a main board and a sub-board installed below the main board, and connecting the main board and the sub-board through a sliding device, the control panel can be extended, solving the problem of limited control panel width and inability to be adjusted according to usage needs, thus improving the user experience. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal distribution of the training device in this utility model.

[0022] Figure 2 This is a schematic diagram of the operating table in this utility model.

[0023] Figure 3 This is a schematic diagram of the main body of the device in this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the cover in this utility model.

[0025] Figure 5 This is a schematic diagram of the panel structure in this utility model.

[0026] In the diagram: 1. Main body of the device; 2. Casters; 3. Operating table; 4. Storage cabinet; 5. Electrical module; 6. Main board; 7. Sub-board; 8. First leg; 9. Second leg; 10. First slide rail; 11. Second slide rail; 12. Slider; 13. Roller; 14. Safety fence; 15. Distribution cabinet; 16. Side panel; 17. Bracket; 18. Crossbeam; 19. Panel; 20. Cover; 21. Hinge; 22. Slotted hole. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example

[0028] This embodiment is a low-voltage electrical work training device, and its overall layout is as follows: Figure 1As shown, the device includes a main body 1, casters 2, a control panel 3, a storage cabinet 4, and an electrical module 5. The casters are installed at the bottom of the main body. The control panel, storage cabinet, and electrical module are all installed inside the main body. The control panel is installed in the upper left corner, the storage cabinet is installed in the lower left corner, and the electrical module is installed on the control panel.

[0029] The lockers are used to store various supporting items and interference items used during practical training. These items include low-voltage detectors, insulating gloves, insulating shoes (boots), safety helmets, voltage testers, protective glasses, insulating pliers, insulating mats, portable grounding wires, foot buckles, safety belts, climbing boards, and safety signs, etc.

[0030] By integrating storage cabinets and workbenches into a single device, various training activities can be completed within one unit, eliminating the need to retrieve items from designated locations. This broadens its application range and increases training efficiency. Furthermore, the inclusion of casters at the bottom allows for easy movement to any location, eliminating the need to carry additional items. This convenient and easy-to-use design makes the device suitable for training in any setting.

[0031] Specifically:

[0032] like Figure 2 As shown, the control panel includes a main board 6, a sub-board 7, a first leg 8, a second leg 9, a back panel, and electrical modules. The main board and the sub-board are connected by a sliding device. The first leg is installed below the main board, the back panel is installed above the main board, the second leg is installed below the sub-board, and the electrical modules are installed on the back panel.

[0033] The sliding device includes a roller 13, a slider 12, a first slide rail 10, and a second slide rail 11. The first slide rail is installed on the lower surface of the main board, and the second slide rail is installed on the upper surface of the sub-board. The first slide rail and the second slide rail are arranged opposite to each other. The upper surface of the slider is connected to the first slide rail, and the lower surface of the slider is connected to the second slide rail. The slider is fixed to the right end of the second slide rail and slides freely in the first slide rail. The roller is installed at the bottom of the second support leg.

[0034] During operation, the sub-plate is pushed, the rollers slide on the floor, and the slider slides in the first slide rail, pulling the sub-plate out and extending the width of the worktable. In other embodiments, a locking device can be provided on the first slide rail to fix the sub-plate when it moves to the appropriate position. In other embodiments, a locking device can also be provided on the rollers to fix the sub-plate when it moves to the appropriate position.

[0035] like Figure 3 As shown, the main body of the device includes a base plate and four side plates 16. The four side plates are connected end to end on the base plate. Three of the side plates are identical, and the remaining one has an entrance / exit so that trainees can enter and exit the training device.

[0036] The side panel consists of an aluminum profile frame and a perforated plate. The perforated plate is installed on the aluminum profile frame and can be used to hang various instruments and electrical components.

[0037] The electrical module includes a housing 20 and a panel 19. The housing is mounted on a back panel, the panel is mounted on the housing, and the electrical components are mounted on the panel.

[0038] Specifically, such as Figure 4 As shown, the power supply and PCB board are installed inside the housing. The PCB microcontroller pins are connected to the ports for reading the status of each port. The interior of the housing is mainly used to house various circuit wires and power supplies. The overall panel is relatively heavy. To facilitate single-person maintenance of the rear signal lines, a hole is made on the left side of the housing for installing hinge 21. The panel can be rotatably mounted on the housing via the hinge.

[0039] In this embodiment, three hinges are installed to distribute the weight of the panel, ensuring smooth opening and preventing hinge deformation. By installing the hinges in reverse, the panel can be opened 180° and closed flush with the cover.

[0040] Meanwhile, to prevent the panel from deforming due to excessive force when connecting the wires, a square steel bar is added at the top, middle, and bottom of the panel as a reinforcing rib.

[0041] like Figure 5 As shown, the electrical components are arranged on the panel. The circuit breaker and electricity meter are placed in the top row on the front of the panel, the residual current device is placed in the middle row, and the switches and sockets are placed in the bottom row, which makes it easier to connect the wires (the main circuit is connected from top to bottom).

[0042] All terminal blocks are through-wall type, which reduces losses and optimizes the identification of terminal blocks.

[0043] Traditional electrical components are directly connected to their terminals. Because this is training and assessment equipment, the frequent and potentially violent use of these components can easily damage them, leading to high losses. Using through-wall terminal blocks, the wires for each component enter the panel through pre-drilled holes at the top and bottom, connecting to the terminal blocks on the back of the panel. This allows for signal and port replacement, extending the original component connections to the through-wall terminal blocks on the front, reducing visual clutter. Wire connections are only required at the terminal blocks; if a terminal block is damaged, it only needs to be replaced, significantly reducing costs. Signal cables can be connected to the terminal blocks on the back, concealing them and making the front appearance more realistic, clearly indicating the connection status with the host computer's identification port.

[0044] Indicator lights can also be installed on the panel. The indicator lights are connected to the PCB board, and the indicator lights form a current loop with the corresponding electrical components through the PCB board so that the display is made when the corresponding electrical components are correctly connected.

[0045] The training device provided in this embodiment also includes a lighting device, which includes a bracket 17, a crossbeam 18, and an energy-saving lamp. There are two brackets, which are respectively installed on the top of the front and rear side plates of the main body of the device. The crossbeam is installed in the middle of the bracket and connected to the two brackets. The energy-saving lamp is installed on the crossbeam.

[0046] The training device provided in this embodiment also includes a voltage testing device, which includes a tray, a voltage tester, and a multimeter. The voltage tester and the multimeter are installed in the tray for easy storage and to prevent accidental activation of the voltage tester.

[0047] The tray has aviation plugs for securing the voltage tester and multimeter, and spring wires for communication between the voltage tester, multimeter, and host computer.

[0048] A voltage testing device is installed. The training device provided in this embodiment has a voltage testing function, ensuring that trainees are aware that the objects they operate on are not energized. Furthermore, the voltage tester must have a self-test function to verify its integrity. Therefore, a self-test is performed at the live wire port on the upper end of the circuit breaker. When the upper computer scanning port is in self-test mode (the voltage tester touches the live testing point, and the finger lightly touches the tail of the voltage tester), the internal light of the voltage tester will illuminate. At this time, the circuit breaker on the panel is in the open state. Before operation, ensure that the downstream circuit is not energized. Trainees use the voltage tester to test the voltage at the neutral and live wire ports on the lower end of the circuit breaker. The scoring system needs to obtain scores for both holding the voltage tester by hand and testing the voltage at the L and N terminals on the lower end of the circuit breaker with the pen tip.

[0049] The low-voltage electrical work training device provided in this embodiment can achieve the following functions:

[0050] 1. It is equipped with physical electrical components for selection and use during practical operation, and real equipment is provided as the operation objects to restore the real working environment and reduce the deviation between the training device and the actual work.

[0051] 2. Regarding the work process, commercially available equipment neglects pre-operation preparation and the selection of electrical components, failing to create a workstation capable of performing a complete workflow. This training device is equipped with real safety equipment, both good and bad. Before operation, the safety equipment can be inspected, and only those that are in good working order should be selected and used.

[0052] 3. Safety is the primary focus of the safety technology exam. More safety precautions will be incorporated into the training equipment to address the issue of a technology-driven approach with insufficient emphasis on safety.

[0053] The low-voltage electrical work training device provided in this embodiment has the following advantages:

[0054] 1. Enhanced Modularity and Flexibility: The aluminum profile frame and perforated panel design not only facilitate rapid assembly and layout adjustments but also provide a high degree of modularity and scalability. This means that training modules can be easily added or replaced according to changes in training needs, improving the diversity and adaptability of training content.

[0055] 2. Emphasis on both realism and safety in practical training: By simulating a real electrical circuit environment, combined with safety protection measures (insulating tools, safety signs, etc.), voltage testing operations, circuit testing, etc., the training not only ensures a realistic working environment but also guarantees the safety of trainees during operation, reducing the risks in actual operation.

[0056] 3. Efficient integration and utilization of resources: The centralized locker design effectively integrates all necessary tools and safety equipment, making it convenient for trainees to select as needed, and also facilitating management and maintenance, reducing resource waste and preparation time before operation.

[0057] 4. Combining theory with practice: The training station not only provides opportunities for hands-on operation, but also strengthens the integration of theoretical knowledge with the actual operation of the overall process through the identification and application of safety signs and the correct use of instruments. This helps trainees fully understand the importance and specific implementation methods of safe electrical operation.

[0058] Example 2:

[0059] This embodiment provides a low-voltage electrical work training device, which can be used in specific application scenarios.

[0060] Specialized operations personnel must receive safety production education and training, and only those who pass can be certified to work. Traditional training devices mostly consist of electrical components mounted on a panel. For example, an operating console is designed with an electrical component module panel, where electrical components are installed according to certain circuit rules, simulating a circuit environment. Operators connect and operate the electrical components on this module, serving as a training device. Alternatively, an operating console with an electrical component module panel is designed, where electrical components are installed according to certain circuit rules, simulating a circuit environment, and connectors are provided for wiring operations, serving as a training device. In the assessment station of intelligent equipment, the main method is to display images on a touchscreen and select from them, lacking the realism of preparing work items beforehand. Another type of training device, while providing pre-operation preparation items, cannot include items required for another assessment component, thus failing to form a complete integrated training and examination device.

[0061] Therefore, a well-designed, safe, and reliable training device is needed. By integrating safety equipment such as a pre-operation safety protection equipment storage device, an operating table, and realistic work objects, low-voltage electrical work training can be made safer, more reasonable, realistic, and comprehensive, enabling the training of low-voltage electricians who meet standard requirements and possess safety awareness.

[0062] The training device provided in this embodiment uses an aluminum profile frame to construct a 2m*2m*2m training space, with 1m*1m perforated panels filling the frame walls. The aluminum profiles and perforated panels facilitate the mounting of various facilities, cable trays, voltage testing points, etc., and offer high scalability.

[0063] The training device space is equipped with a storage cabinet located in the lower left corner of the front top view of the training device; an operating table located in the upper left corner of the front top view of the training device; and a power distribution cabinet 15 located in the upper right corner of the front top view of the training device. Another safety barrier 14 is installed on the front of the power distribution cabinet.

[0064] The lockers contain various items needed for the exam, as well as distracting items. These items include those for use in both Subject 1 and Subject 2 (preparation before the exam). This embodiment uses lockers measuring 0.4m x 0.95m x 2m, sufficient to hold all the items required for the assessment. The main function of this locker in the training device is to integrate the selection of actual (non-virtual) items into the device, enabling pre-exam preparation. Personnel can easily select the necessary items within the device. This confines the assessment process to the training device, allowing for a closed-loop assessment without leaving it. Examiners demonstrate their knowledge of safety equipment and electrical components by selecting the correct items from the lockers and placing them on the workbench or wearing and using them.

[0065] Safety signs can be hung on safety fences to demarcate work areas and serve as designated points for attaching specific safety signs. During practical training, examine the safety signs in the lockers and analyze their meanings. Select the appropriate safety signs and hang them on the front of the distribution cabinet or on the safety fence.

[0066] The first row of the distribution cabinet contains a circuit breaker on the left, with a 3-port terminal block above and below it. The right side of the first row contains three 4-port terminal blocks (SB1, SB2, and SB3). The second row contains a 5-pole fuse on the left and a 5-port terminal block above and below it, and a current transformer on the right and a 2-port terminal block. The third row contains a contactor on each side and two terminal blocks (upper 3-port + lower 3-port + 6-port). The fourth row contains a thermal relay on the left and a 3-segment + 3-port + 4-port terminal block, and a 3-port terminal block for the motor on the right. Wiring operations for electrical components are possible.

[0067] During practical training, a voltage tester can be used to test the voltage points on the distribution cabinet. The live voltage test point is located at the upper left corner of the distribution cabinet, approximately 1.8m above the ground, while the voltage test point on the outer casing of the distribution cabinet is located at the upper right corner of the left side of the cabinet. Before using the voltage tester, it should be self-tested to ensure its reliability. The trainee picks up the voltage tester and tests the voltage test points to ensure its reliability. Before operation, ensure that the outer casing of the distribution cabinet is not energized. The trainee uses the voltage tester to test the voltage points on the outer casing of the distribution cabinet to prevent electric shock when opening the cabinet door. At this time, the circuit breaker inside the distribution cabinet is in the open state to ensure that there will be no electric shock during the operation. The trainee tests the voltage on the three phases below the circuit breaker. The scoring system requires the trainee to obtain the voltage test results for the following phases: holding the voltage tester and testing the U phase below the circuit breaker with the tip; holding the voltage tester and testing the V phase below the circuit breaker with the tip; and holding the voltage tester and testing the W phase below the circuit breaker with the tip.

[0068] The multimeter, clamp meter, megohmmeter, and ground resistance tester are set up on the operating table for operation. The instruments can be placed on the tabletop or hung on the perforated plate around the table. The multimeter, clamp meter, and ground resistance tester are connected to the bow-shaped aviation plug fixing piece located on the back of the operating table using spring wires. The spring wire design function is to ensure that the instruments are used only on the operating table, preventing them from being taken away or lost, or used for test questions outside the operating table.

[0069] Simultaneously, the spring wire also serves as a conductor to facilitate communication between the instrument and the host computer, returning the instrument's status, such as its range, measurement activity, and the correct object being measured. The other end of the spring wire is an aviation connector, which facilitates quick assembly and prevents incorrect wiring from rendering the instrument unusable.

[0070] The megohmmeter is designed with a base fixed to the lower right corner of the workbench. Previously, using a megohmmeter required cranking the handle, which could easily cause it to wobble. By rigidly fixing the megohmmeter to the workbench with the base, the operator can use both hands simultaneously while measuring, eliminating the need to hold the megohmmeter steady with one hand, making it much more convenient. The crank extends beyond the workbench surface, preventing fingers from hitting the tabletop during cranking.

[0071] The signal wires are exposed through a bottom opening of the megohmmeter, with additional openings on the top and right sides of the base. The signal wires connect to the host computer below the control panel via the base openings and side holes. The right side of the megohmmeter base is against the wall, making the wires less visible and maintaining the megohmmeter's aesthetic integrity. This area integrates multimeter testing for single-phase circuit voltage, clamp meter testing for three-phase circuits, megohmmeter testing for motor drive junction boxes, and a display and demonstration of safety protection equipment.

[0072] To prevent operational errors due to insufficient lighting within the training equipment, energy-saving lamps were installed above the workstations. Aluminum profile brackets, 50-70cm high, were installed on the front and rear walls of the training equipment, with a 2m horizontal aluminum profile in the middle for mounting the energy-saving lamps. The lamps were installed in the center of the 2m aluminum profile. The built-in lighting function provides sufficient illumination for personnel to work in low-light conditions.

[0073] This utility model provides a comprehensive low-voltage electrical work training and examination device, establishing a work scenario where personnel can perform operations within a 2m*2m*2m work area. It comprises multiple components including a device frame, safety equipment and storage devices, an operating console module (containing instruments and their testing objects), a voltage tester module, and a real electrical component power (distribution) cabinet module. Personnel can select objects; wear protective gear and use tools; operate instruments to measure objects; check the correctness of object placement; connect and disconnect wires within the distribution cabinet, and implement safety measures before connecting and disconnecting wires; and illuminate lighting to provide feedback on the connection status during verification. This provides a safe, realistic, and complete working environment for low-voltage electrical work training.

[0074] The practical training and examination device provided in this embodiment has the following advantages:

[0075] (1) Preparations before integrated operation

[0076] Safety equipment is no longer presented in a virtual or fragmented form, but integrated into the training device, which then forms a complete work process.

[0077] (2) Use of independent electrical instruments

[0078] The pre-operation inspection and correct testing of electrical instruments are separated and incorporated into the training device modules, truly achieving an independent process for the inspection and testing of electrical instruments before operation.

[0079] (3) Realize the work objects and integrate them into the workstation.

[0080] To minimize the discrepancy between the training equipment and the actual equipment, the work should be modeled after real equipment, including wire cutting, stripping, and wiring, followed by actual testing.

[0081] (4) Safety testing contents

[0082] The addition of a voltage tester function allows the voltage tester to perform self-tests and also test the object being operated on to ensure that the object is not energized. This function can enhance the safety awareness of operators.

[0083] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A low-voltage electrical work training device, characterized in that, The device includes a main body and casters mounted on the bottom of the main body. The main body contains an operating table and a storage cabinet. The operating table has an electrical module. The operating table includes a main board and a sub-board mounted below the main board. The main board and the sub-board are connected by a sliding device. The main body includes a base plate and side plates mounted on the base plate. The side plates include an aluminum profile frame and a perforated plate mounted on the aluminum profile frame. Electrical components and instruments are hung on the perforated plate.

2. The low-voltage electrical work training device according to claim 1, characterized in that, The sliding device includes a first slide rail installed at the bottom of the main board and a second slide rail installed at the upper surface of the sub-board. A slider is provided between the first slide rail and the second slide rail, and the slider is fixedly installed on the second slide rail.

3. The low-voltage electrical work training device according to claim 1, characterized in that, The electrical module includes a housing mounted on the back panel of the control panel and a panel mounted on the housing. A power supply and a PCB board are installed inside the housing, and electrical components are mounted on the panel and connected to the PCB board.

4. The low-voltage electrical work training device according to claim 3, characterized in that, The panel is equipped with indicator lights, which are connected to the PCB board. The indicator lights and corresponding electrical components form a current loop through the PCB board.

5. A low-voltage electrical work training device according to claim 1, 2, or 3, characterized in that, It also includes a lighting device, which includes brackets installed on the front and rear sides of the top of the device body, with a crossbeam between the brackets and an energy-saving lamp installed on the crossbeam.

6. A low-voltage electrical work training device according to claim 1, 2, 3, or 4, characterized in that, It also includes a voltage testing device, which includes a tray mounted on an operating table. A voltage tester and a multimeter are fixed on the tray via an aviation connector. The voltage tester and the multimeter are connected to a host computer.

7. A low-voltage electrical work training device according to claim 1, 2, 3, or 4, characterized in that, An aviation plug fastener is installed on the back panel of the control panel, and the aviation plug fastener is connected to the instrument via a spring wire.

8. A low-voltage electrical work training device according to claim 3 or 4, characterized in that, The cover and the panel are connected by a hinge, the panel is provided with reinforcing ribs, and the bottom of the cover is provided with a slotted hole.

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