An unmanned aerial vehicle conveying device for power grid maintenance

Abstract

The utility model relates to unmanned aerial vehicle conveying technical field, and disclose an electric network overhauls unmanned aerial vehicle conveying device, the unmanned aerial vehicle rack outer end four quarters are installed respectively with fan wheel group, is provided with main control box at unmanned aerial vehicle rack lower extreme, is connected with fixed block respectively at main control box lower extreme surface both sides, wherein the central place has box in main control box lower extreme, in the electric network overhauls work, through the collaborative work of fan wheel group, motor and storage box, realized the steady aerial flight, can reach the overhauls area of remote or artificial difficultly, main control box is equipped with infrared sensor, photosensitive sensor and camera, make it have accurate positioning and environmental perception ability, can find overhauls target quickly, reduce search time, simultaneously, the clamping assembly can carry out the clamping and release operation of box fast, accurate, the transportation and the putting of equipment are convenient, have promoted the efficiency of whole overhauls operation, make overhauls personnel can more efficiently complete the work task.

Description

Technical Field

[0001] This utility model relates to the field of drone delivery technology, specifically a drone delivery device for power grid maintenance. Background Technology

[0002] As a key infrastructure for energy supply in modern society, the stable operation of the power grid is crucial to social production and life. Regular power grid maintenance, timely detection and elimination of potential faults, are necessary measures to ensure the safe and reliable power supply of the power grid. In traditional power grid maintenance work, equipment transportation and installation mainly rely on manual operation. However, the power grid is widely distributed, and some lines and equipment are located in mountainous areas, jungles, or water areas with complex terrain and inconvenient transportation. Manual transportation and maintenance of equipment is not only time-consuming and labor-intensive, but also inefficient, and poses significant safety risks. Maintenance personnel are prone to slipping, falling, and other accidents during transportation. At the same time, manual handling makes it difficult to ensure that the equipment remains intact during transportation.

[0003] With the development of drone technology, drones, due to their flexibility, convenience, and adaptability to complex environments, are gradually being applied to the field of power grid maintenance. However, existing drones have many problems when used for transporting power grid maintenance equipment. On the one hand, they lack precise positioning and environmental awareness capabilities, making it difficult to accurately avoid obstacles in complex power grid environments, which can easily lead to collisions, drone crashes, and equipment damage. On the other hand, the equipment transportation and deployment process is not stable and reliable enough. Traditional drone mounting methods are prone to shaking during flight, affecting equipment safety. Moreover, once the equipment arrives at the maintenance location, it is impossible to accurately and quickly load and unload it, which seriously affects the progress of maintenance work.

[0004] To address the aforementioned issues and meet the demands for efficient, safe, and reliable power grid maintenance, it is imperative to develop a drone delivery device for power grid maintenance. This device should enable stable flight, precise positioning, safe transportation, and convenient loading and unloading, providing more advanced and reliable technical support for power grid maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a drone delivery device for power grid maintenance, which solves the aforementioned problems.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a drone conveying device for power grid maintenance, comprising a drone frame, fan wheel sets installed around the outer perimeter of the drone frame, a main control box located at the lower end of the drone frame, infrared sensors installed on both sides of the outer end of the main control box, a photosensitive sensor installed on one side of each infrared sensor, a camera installed on the front surface of the main control box, fixing blocks connected to both sides of the lower surface of the main control box, clamping plates installed at the lower ends of both fixing blocks, and casters installed on the lower surfaces of the clamping plates, wherein a housing is placed in the center of the lower end of the main control box, and further comprising:

[0007] The clamping assembly is configured in two sets, and is installed inside the two fixing blocks respectively, and is used to clamp and fix the outer end of the box.

[0008] Preferably, a battery storage box is installed at the center of the lower end of the drone frame, and the lower end of the battery storage box is fixedly connected to the center of the upper end of the main control box. Motors are installed in the center of the fan wheel assembly, and impellers are connected to the upper output ends of the motors.

[0009] Preferably, the fixing block has limit plates on both sides inside, and a sliding groove is provided on both sides of the lower surface of the fixing block. A connecting rod is provided at the lower end of each sliding groove, and the lower end of the connecting rod is connected to the upper surface of the clamping plate.

[0010] Preferably, the clamping assembly includes a sliding plate, an internal rack, and a drive gear plate. The drive gear plate is respectively disposed in the center of the interior of the two fixed blocks. A connecting rod is connected to the center of the upper end of the drive gear plate. The upper end of the connecting rod is connected to the lower end of the interior of the main control box. Sliding plates are slidably disposed on both sides inside the fixed blocks. The lower ends of the sliding plates are respectively connected to the upper surface of the connecting rod through the interior of the sliding groove. Internal racks are respectively connected to the inner opposite surfaces of the two sliding plates.

[0011] Preferably, the front ends of the two internal racks extend through the interior of the limiting plate to the center of the fixed block, and the inner outer ends of the two internal racks mesh with the outer end of the drive gear plate.

[0012] Preferably, a plurality of small device placement slots are provided on one side of the surface of the box, and a box door is connected to the outer end surface of each small device placement slot. A large device placement slot is provided on the other side of the surface of the box, and a box door is connected to the outer end surface of the large device placement slot. Fixing buckles are provided on both sides of the box, and connecting pieces are connected to the outer end of both box door one and box door two, and the connecting pieces are respectively sleeved on the outer end of the fixing buckles.

[0013] Compared with the prior art, this utility model provides a drone delivery device for power grid maintenance, which has the following advantages:

[0014] In power grid maintenance, this device achieves stable aerial flight through the coordinated operation of the fan wheel assembly, motor, and battery storage tank. It can quickly reach remote or inaccessible maintenance areas. The main control box is equipped with infrared sensors, photosensitive sensors, and cameras, giving it precise positioning and environmental awareness capabilities. It can quickly locate maintenance targets and reduce search time. At the same time, the clamping components can quickly and accurately clamp and release the box, facilitating the transportation and deployment of the equipment. This greatly shortens the transportation time of power grid maintenance equipment, improves the overall efficiency of maintenance operations, and enables maintenance personnel to complete their tasks more efficiently.

[0015] When a dangerous situation is detected, the main control box can adjust the drone's flight attitude in a timely manner to avoid collisions and ensure the safety of the drone and transportation equipment. The camera transmits the maintenance site footage to the operator in real time, allowing the operator to remotely monitor and operate without being physically present in the danger zone, reducing the safety risks of manual maintenance. The enclosure's design, including slots for small and large components and a sealed door, ensures the stability and safety of the maintenance equipment during transportation, preventing damage or loss and providing reliable safety assurance for the smooth progress of power grid maintenance work. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the fan wheel assembly structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the clamping component structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the box structure of this utility model.

[0020] In the diagram: 1. Drone frame; 2. Fan wheel assembly; 3. Main control box; 4. Infrared sensor; 5. Photosensitive sensor; 6. Camera; 7. Fixing block; 8. Clamping plate; 9. Casters; 10. Housing; 11. Battery box; 12. Motor; 13. Impeller; 14. Limiting plate; 15. Slide plate; 16. Internal rack; 17. Drive gear plate; 18. Connecting rod; 19. Small component placement slot; 20. Door 1; 21. Connector; 22. Fixing buckle; 23. Large component placement slot; 24. Door 2. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 A drone conveying device for power grid maintenance includes a drone frame 1, fan wheel sets 2 installed around the outer perimeter of the drone frame 1, a main control box 3 located at the lower end of the drone frame 1, infrared sensors 4 installed on both sides of the outer end of the main control box 3, photosensitive sensors 5 installed on one side of each infrared sensor 4, a camera 6 installed on the front surface of the main control box 3, fixing blocks 7 connected to both sides of the lower surface of the main control box 3, clamping plates 8 installed at the lower ends of both fixing blocks 7, and casters 9 installed on the lower surface of each clamping plate 8. A housing 10 is placed in the center of the lower end of the main control box 3. The device also includes:

[0023] The clamping components are configured in two sets and are respectively installed inside the two fixing blocks 7, and are used to clamp and fix the outer end of the box 10.

[0024] Furthermore, a battery storage box 11 is installed at the center of the lower end of the drone frame 1. The lower end of the battery storage box 11 is fixedly connected to the center of the upper end of the main control box 3. Motors 12 are installed in the center of the fan wheel assembly 2. Impellers 13 are connected to the upper output end of each motor 12.

[0025] Furthermore, limit plates 14 are provided on both sides of the inside of the fixing block 7, and sliding grooves are provided on both sides of the lower surface of the fixing block 7. A connecting rod 18 is provided at the lower end of each sliding groove, and the lower end of the connecting rod 18 is connected to the upper surface of the clamping plate 8.

[0026] Furthermore, the clamping assembly includes a sliding plate 15, an internal rack 16, and a drive gear 17. The drive gear 17 is respectively disposed in the center of the interior of the two fixed blocks 7. A connecting rod is connected to the center of the upper end of the drive gear 17. The upper end of the connecting rod is connected to the lower end of the interior of the main control box 3. Sliding plates 15 are slidably disposed on both sides inside the fixed blocks 7. The lower ends of the sliding plates 15 are respectively connected to the upper surface of the connecting rod 18 through the interior of the sliding groove. The internal rack 16 is connected to the inner opposite surfaces of the two sliding plates 15.

[0027] Furthermore, the front ends of the two internal racks 16 extend through the interior of the limiting plate 14 to the center of the interior of the fixing block 7, and the inner outer ends of the two internal racks 16 mesh with the outer end of the drive gear plate 17.

[0028] Furthermore, a number of small device placement slots 19 are provided on one side of the surface of the housing 10, and a door 20 is connected to the outer end of each small device placement slot 19. A large device placement slot 23 is provided on the other side of the housing 10, and a door 24 is connected to the outer end of the large device placement slot 23. Fixing buckles 22 are provided on both sides of the housing 10, and connecting pieces 21 are connected to the outer end of both door 20 and door 24, and the connecting pieces 21 are respectively sleeved on the outer end of the fixing buckles 22.

[0029] The UAV frame 1 serves as the core load-bearing component of the entire device, supporting and securing other functional components. Mounting positions are evenly distributed around its outer perimeter to secure the fan wheel assembly 2, providing the basic structure for the UAV's flight propulsion. Simultaneously, a mounting interface is reserved at the center of the lower end of the frame for installing the battery tank 11, which is connected to the center of the upper end of the main control box 3 via a specific connection structure, ensuring the overall stability of the device structure and the coordination between its components.

[0030] Fan wheel assembly 2: Symmetrically mounted around the outer perimeter of the UAV frame 1, each fan wheel assembly 2 has a motor mounting position in the center for mounting motor 12. The output shaft of motor 12 is coaxially connected to impeller 13. When motor 12 is energized, it drives impeller 13 to rotate at high speed, generating lift and flight propulsion. The design and layout of fan wheel assembly 2 ensure that the UAV can maintain balance and stability during flight, enabling flexible aerial movement.

[0031] Main control box 3: Located at the lower end of the drone frame 1, it is the control center of the entire device. Sensor mounting slots are designed on both sides of its outer end for precise installation of infrared sensors 4 and photosensors 5 to acquire real-time environmental information. A camera mounting bracket is provided on the front surface of the main control box 3 to securely mount the camera 6, facilitating the capture of images of the power grid equipment and surrounding environment. On both sides of the lower surface of the main control box 3, there are connecting structures for fixing blocks 7, which are securely installed using bolts or other fastening methods. Simultaneously, a connection interface for a drive gear 17 is reserved inside the lower part of the main control box 3, enabling power transmission and control of the clamping components via a connecting rod.

[0032] Infrared sensor 4: Installed in sensor mounting slots on both sides of the outer end of the main control box 3, and connected to the control system inside the main control box 3 via wiring. Infrared sensor 4 can transmit and receive infrared signals in real time, detect the distance between the drone and surrounding obstacles, and transmit the data to the main control box 3, providing the main control box 3 with obstacle avoidance decision-making basis.

[0033] Photosensitive sensor 5: Also installed on both sides of the outer end of the main control box 3, adjacent to the infrared sensor 4. The photosensitive sensor 5 is mainly used to sense changes in ambient light intensity, convert the light signal into an electrical signal and transmit it to the main control box 3, helping the main control box 3 to make adjustments under different lighting conditions, and assisting in the flight and operation control of the drone.

[0034] Camera 6: Fixedly mounted on a camera mounting bracket on the front surface of the main control box 3, with the lens facing forward of the drone. Camera 6 is connected to the image transmission module inside the main control box 3 via a data cable, enabling it to capture real-time images of the power grid equipment and its surrounding environment, and transmit the image information to a remote control terminal, allowing operators to remotely monitor the maintenance site.

[0035] Fixed block 7: Installed on both sides of the lower surface of the main control box 3, with limit plates 14 on both sides inside. The limit plates 14 have guide grooves for limiting and guiding the internal moving parts. Slide grooves are formed on both sides of the lower surface of the fixed block 7, and slide plates 15 are installed inside the slide grooves. The slide plates 15 can slide in a specific direction within the slide grooves. A drive gear 17 is set in the center of the fixed block 7, and the drive gear 17 is connected to the lower end of the main control box 3 through a connecting rod.

[0036] Clamping plate 8: Located below the fixing block 7, it is connected to the sliding plate 15 via a connecting rod 18. A caster wheel 9 is mounted on the lower surface of the clamping plate 8 for easy movement of the device on the ground. When the sliding plate 15 slides within the groove, the connecting rod 18 drives the clamping plate 8 to move synchronously, thus achieving the clamping and releasing operation of the housing 10.

[0037] Casters 9: Installed on the lower surface of clamping plates 8, with at least one caster 9 installed on each clamping plate 8. Casters 9 can rotate freely 360 degrees, making the device more flexible and convenient to move on the ground, facilitating short-distance position adjustments and equipment transport for the UAV after reaching the target location.

[0038] Box 10: Located at the lower center of the main control box 3, it serves as a carrier for transporting power grid maintenance equipment. One side of box 10 has several small component placement slots 19, each with a door 20 attached to its outer end. The door 20 is opened and closed via hinges or other connecting structures. The other side of box 10 has a large component placement slot 23, with a second door 24 attached to its outer end. Fixing buckles 22 are provided on both sides of box 10. Connectors 21 on the outer ends of doors 20 and 24 can be fitted onto the fixing buckles 22, ensuring the safety of the maintenance equipment during transport.

[0039] Battery storage box 11: Installed at the center of the lower end of the UAV frame 1, with its lower end fixedly connected to the center of the upper end of the main control box 3. The battery storage box 11 contains a battery pack, which is connected to the motor 12, the main control box 3 and other electrical components through wiring, providing a stable power supply for the entire device.

[0040] Motor 12: Mounted in the central motor mounting position inside the fan wheel assembly 2, and fixed by a motor bracket. The upper output end of motor 12 is connected to impeller 13. After motor 12 is powered on, its rotor rotates, driving impeller 13 to rotate at high speed, providing flight power for the UAV. The speed and torque of motor 12 can be adjusted through the main control box 3 to adapt to different flight requirements.

[0041] Impeller 13: Coaxially connected to the upper output shaft of motor 12, impeller 13 rotates at high speed under the drive of motor 12, pushing air to generate lift, enabling the drone to take off and fly. This improves the drone's flight efficiency and stability.

[0042] Limiting plates 14: These are located on both sides inside the fixing block 7 and are installed on the inner wall of the fixing block 7 by bolts or other fixing methods. The limiting plates 14 have guide grooves that cooperate with the inner rack 16 and the sliding plate 15 to limit and guide their movement, ensuring that the inner rack 16 and the sliding plate 15 maintain linear movement during operation, thereby improving the working accuracy and stability of the clamping assembly.

[0043] Slide plate 15: Installed in the grooves on both sides of the lower surface of the fixed block 7, it can slide horizontally within the grooves. The lower end of the slide plate 15 is connected to the clamping plate 8 via a connecting rod 18, and the inner opposite surfaces are connected to the inner rack 16. When the inner rack 16 moves under the drive of the drive gear plate 17, the slide plate 15 slides synchronously within the grooves, thereby driving the clamping plate 8 to perform clamping and releasing operations on the housing 10.

[0044] Internal rack 16: Connected to the inner opposing surfaces of the two slide plates 15, its front end passes through the guide groove of the limiting plate 14 and extends to the center of the fixed block 7, meshing with the outer end of the drive gear 17. The tooth profile and size of the internal rack 16 match the drive gear 17. When the drive gear 17 rotates, it drives the internal rack 16 to move through gear meshing, thereby realizing the motion control of the slide plates 15 and the clamping plate 8.

[0045] Drive gear 17: Located in the center inside the two fixed blocks 7, a connecting rod is connected to the center of the upper end of the drive gear 17. The connecting rod passes through the top of the fixed block 7 and is connected to the drive structure at the lower end of the main control box 3. The main control box 3 drives the drive gear 17 to rotate through the drive structure. The drive gear 17 drives the clamping assembly through meshing with the internal rack 16, thereby controlling the clamping and releasing of the clamping plate 8 on the housing 10.

[0046] Connecting rod 18: Used to connect the slide plate 15 and the clamping plate 8. Its upper end is fixedly connected to the slide plate 15, and its lower end is correspondingly connected to the upper surface of the clamping plate 8. The connecting rod 18 plays a role in force transmission. When the slide plate 15 slides in the groove, the clamping plate 8 is driven to move synchronously through the connecting rod 18, ensuring that the clamping plate 8 can accurately clamp and release the box 10.

[0047] Small component storage slot 19: Located on one side surface of the housing 10, it is used to store small power grid maintenance equipment and tools. The size and shape of each small component storage slot 19 are designed according to the characteristics of the equipment stored.

[0048] Box door 20: Installed on the outer end surface of each small component placement slot 19. When the box door 20 is closed, it can seal the small component placement slot 19 and protect the internally stored equipment from the influence of the external environment.

[0049] Connector 21: Connected to the outer end of the first door 20 and the second door 24, its shape and size match the fixing buckle 22. Connector 21 can be sleeved on the outer end of the fixing buckle 22 to ensure the safety of the maintenance equipment placed in the slot during transportation.

[0050] Fixing buckle 22: Located on both sides of the enclosure 10, it works in conjunction with the connector 21 on the first enclosure door 20 and the second enclosure door 24. The fixing buckle 22 is installed on the enclosure 10 by bolts or other fixing methods, providing a connection point for the connector 21, ensuring that the enclosure door can be securely closed on the placement slot, and achieving sealed protection for the maintenance equipment.

[0051] Large component placement slot 23: Located on the other side surface of the enclosure 10, it is used to store large power grid maintenance equipment. The large component placement slot 23 is relatively large.

[0052] Second door 24: Installed on the outer end surface of the large component placement slot 23, its structure and function are similar to that of first door 20. It is connected to the cabinet 10 via a hinge and can be opened and closed. When the second door 24 is closed, it seals the large component placement slot 23, protecting the large equipment inside, and cooperates with the fixing buckle 22 via the connector 21 to ensure the firmness of the door after it is closed.

[0053] Instructions for use

[0054] The fan wheel assembly 2 is installed around the outer perimeter of the drone frame 1. The motor 12 inside the fan wheel assembly 2 drives the impeller 13 to rotate at high speed, generating lift to enable the drone to take off stably and fly in the air. The battery box 11, located at the lower center of the drone frame 1, provides power to the motor 12 and other electrical components, ensuring the drone's continuous and stable operation. In the power grid maintenance environment, the drone needs to accurately locate and avoid obstacles. The infrared sensors 4 and photosensitive sensors 5 on both sides of the main control box 3 play a crucial role. The infrared sensors 4 can detect the distance between the drone and surrounding obstacles in real time, transmitting a signal to the main control box 3 when an obstacle is detected approaching. The photosensitive sensors 5 can sense changes in light intensity, assisting the drone in making environmental judgments under different lighting conditions. The camera 6 on the front surface of the main control box 3 can capture real-time images of the power grid equipment and its surrounding environment, transmitting the image information to the operator for remote monitoring of the maintenance site and accurate operational decisions. When the drone reaches the vicinity of the maintenance target location, the carried equipment box needs to be... 10. When the device is accurately placed or removed, the clamping assembly inside the fixing block 7 begins to function. The drive structure at the lower end of the main control box 3 drives the drive gear 17 to rotate via the connecting rod. Since the inner and outer ends of the two internal racks 16 mesh with the outer ends of the drive gear 17, the rotation of the drive gear 17 will cause the two internal racks 16 to move towards or away from each other along the sliding grooves on both sides of the fixing block 7. The internal racks 16 are connected to the slide plate 15, and the slide plate 15 is connected to the connecting rod 18 via the sliding groove, thereby driving the clamping plate 8 to move. When clamping is required... When holding the box 10, the drive gear 17 rotates to make the two clamping plates 8 move towards each other until the outer end of the box 10 is firmly clamped; when it is necessary to release the box 10, the drive gear 17 rotates in the opposite direction, and the two clamping plates 8 move away from each other, releasing the box 10. The box 10 is designed with a small component placement slot 19 and a large component placement slot 23, which are used to store power grid maintenance equipment and tools of different specifications. The first box door 20 and the second box door 24 are connected to the fixing buckle 22 through the connector 21 to seal the placement slots and ensure the safety of the equipment during transportation.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A UAV conveying device for power grid maintenance, comprising a UAV frame (1), wherein fan wheel sets (2) are respectively installed around the outer end of the UAV frame (1), a main control box (3) is provided at the lower end of the UAV frame (1), infrared sensors (4) are respectively installed on both sides of the outer end of the main control box (3), and photosensitive sensors (5) are installed on one side of each infrared sensor (4), a camera (6) is installed on the front surface of the main control box (3), fixing blocks (7) are respectively connected to both sides of the lower surface of the main control box (3), clamping plates (8) are provided at the lower end of each of the two fixing blocks (7), and universal wheels (9) are installed on the lower surface of each clamping plate (8), wherein a box body (10) is placed in the center of the lower end of the main control box (3), characterized in that: Also includes: The clamping components are configured in two sets and are installed inside the two fixing blocks (7) respectively, and are used to clamp and fix the outer end of the box (10).

2. The UAV conveying device for power grid maintenance according to claim 1, characterized in that: The UAV frame (1) has a battery box (11) installed at the center of the lower end. The lower end of the battery box (11) is fixedly connected to the center of the upper end of the main control box (3). Motors (12) are installed in the center of the fan wheel assembly (2). Impellers (13) are connected to the upper output end of each motor (12).

3. The UAV conveying device for power grid maintenance according to claim 1, characterized in that: Limiting plates (14) are provided on both sides of the inside of the fixing block (7). Slide grooves are provided on both sides of the lower surface of the fixing block (7). Connecting rods (18) are provided at the lower end of each slide groove, and the lower end of the connecting rods (18) is connected to the upper surface of the clamping plate (8).

4. The UAV conveying device for power grid maintenance according to claim 1, characterized in that: The clamping assembly includes a sliding plate (15), an internal rack (16), and a drive gear (17). The drive gear (17) is respectively disposed in the center of the interior of the two fixed blocks (7). A connecting rod is connected to the center of the upper end of the drive gear (17). The upper end of the connecting rod is connected to the lower end of the interior of the main control box (3). Sliding plates (15) are slidably disposed on both sides inside the fixed blocks (7). The lower ends of the sliding plates (15) are respectively connected to the upper surface of the connecting rod (18) through the interior of the sliding groove. Internal racks (16) are respectively connected to the inner opposite surfaces of the two sliding plates (15).

5. The UAV conveying device for power grid maintenance according to claim 4, characterized in that: The front ends of the two internal racks (16) extend through the interior of the limiting plate (14) to the center of the interior of the fixing block (7), and the inner outer ends of the two internal racks (16) mesh with the outer end of the drive gear plate (17).

6. The UAV conveying device for power grid maintenance according to claim 1, characterized in that: The box body (10) has several small device placement slots (19) on one side of its surface, and a box door (20) is connected to the outer end of each small device placement slot (19). The box body (10) has a large device placement slot (23) on the other side of its surface, and a box door (24) is connected to the outer end of the large device placement slot (23). Fixing buckles (22) are provided on both sides of the box body (10), and connecting pieces (21) are connected to the outer end of both the box door (20) and the box door (24). The connecting pieces (21) are respectively sleeved on the outer end of the fixing buckles (22).

Images