Weather-resistant side monitoring box
By designing an inverted V-shaped support air guide channel, solar panel power supply, and stainless steel structure in the ship monitoring device, the instability and power supply problems of the monitoring device in harsh environments have been solved, resulting in a weather-resistant side monitoring box with high reliability and convenient maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY 12TH BUREAU GRP HAINAN ENG CO LTD
- Filing Date
- 2025-10-14
- Publication Date
- 2026-07-21
AI Technical Summary
Existing ship monitoring devices degrade in performance under high temperature, high salt spray and high humidity environments, and are not securely fixed under strong wind impact or violent shaking, posing a risk of water and air leakage, affecting the stability and reliability of use.
Design a weather-resistant side monitoring box, which uses an inverted V-shaped support and a wind deflector to form an air channel, combined with solar panel power supply, uses stainless steel structural components with mirror-passive surface, inner liner partition to divide the chamber, and is equipped with wiring holes and emergency drainage holes. The ship's side bracket is adjustable to support the box, achieving windproof, pressure-resistant, heat-insulating and independent power supply.
It improves the stability and reliability of the monitoring device in harsh environments, solves the power supply problem, facilitates equipment replacement and maintenance, extends service life, and enhances sealing and ease of installation.
Smart Images

Figure CN224528915U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of ship monitoring structure technology, specifically relating to a weather-resistant side monitoring box. Background Technology
[0002] The monitoring devices for ships or marine facilities on the market suffer from problems such as insufficient protection, strong dependence on energy supply, and inconvenient maintenance. Especially during long-term deployment in tropical or subtropical waters, the monitoring devices are easily affected by environmental factors such as high temperature, high salt spray, and high humidity, which can lead to performance degradation or even failure to work properly. At the same time, the ship's side mounting structure may also be prone to problems such as insecure fixation, water ingress, and air leakage when subjected to strong winds or violent shaking, which can affect the stability and reliability of its use to a certain extent, making it difficult to meet market demands. Utility Model Content
[0003] The purpose of this invention is to provide a weather-resistant side-mounted monitoring box with a reasonable structural design that is conducive to improving the stability and reliability of use.
[0004] The technical solution to achieve the purpose of this utility model is a weather-resistant side monitoring box, including a ship side bracket installed and fixed on the ship side, a monitoring box structure fixed on the ship side bracket, and a solar panel structure set on the top of the monitoring box structure. The monitoring box structure includes a monitoring box body and a monitoring module set inside the monitoring box body. The solar panel structure includes several pillars, inverted V-shaped supports, and several solar panel bodies; The bottom end of the support column is fixed to the top end of the monitoring box, and the top end of the support column is fixed to the bottom surface of the inverted V-shaped support. The edge of the inverted V-shaped support protrudes from the side of the monitoring box; The top side of the monitoring box is fixed with a downwardly inclined air guide plate. An air guide channel is formed between the bottom surface of the inverted V-shaped support and the top surface of the monitoring box. An air inlet is formed between the inverted V-shaped support and the air guide plate, which is connected to the air guide channel. The solar panel is embedded and fixed on the top slope of the inverted V-shaped support, and the solar panel is connected to the monitoring module.
[0005] A further preferred embodiment is that the monitoring enclosure includes an outer shell, a door, an inner liner, and partitions; The inner liner is located inside the outer shell, and a heat insulation plate is provided between the inner liner and the outer shell; The box door is connected to the side opening of the outer shell via a damping hinge, and the bottom and sides of the outer shell are fixed to the ship's side support. The partition is disposed in the inner liner and divides the inner liner into different chambers; The monitoring modules are installed in different chambers; The air guide plate is fixed to the top edge of the side of the outer casing, and the upper part of the side wall of the outer casing is provided with ventilation holes, which are located in the bottom shielding area of the air guide plate.
[0006] A further preferred embodiment is that the heat insulation board is a honeycomb heat insulation board.
[0007] A further preferred embodiment is that the bottom wall of the outer casing is provided with a wire hole and an emergency drainage hole; A corrugated fluororubber sealing ring and an epoxy waterproof adhesive sealing layer are provided between the wire hole and the data cable.
[0008] A further preferred embodiment is that the emergency drainage hole is a U-shaped hole.
[0009] A further preferred embodiment is that the hull support includes a support plate, at least two inclined support rods, and at least two transverse support rods; The support plate is fixed to the side of the ship's side, and the support plate is provided with at least two parallel vertical adjustment grooves. The bottom end of the inclined support rod is rotatably connected to the lower part of the support plate via a universal ball joint, and the upper part of the inclined support rod is provided with a number of mounting holes in the same vertical line. One end of the horizontal support rod is fixed in the vertical adjustment groove by a nut, and the other end is fixed in different mounting holes on the inclined support rod by bolts. The inclined support rod is supported and limited by the horizontal support rod. The bottom of the outer shell is rotatably connected to the inclined support rod via a connecting shaft, and the side of the outer shell is welded and fixed to the upper part of the support plate.
[0010] A further preferred embodiment is that the monitoring module includes a battery pack, a monitoring controller, several monitoring sensors, a slide rail, and a mounting support plate; The battery pack is disposed in one of the chambers; The slide rail is fixed to the inner wall of one of the chambers; The mounting support plate is provided with a plurality of mounting holes, the monitoring controller is disposed on the mounting holes of the mounting support plate, and the mounting support plate can be slidably disposed on the slide rail; The monitoring sensor is mounted on the housing and connected to the monitoring controller via a data bus or wireless communication interface.
[0011] More preferably, the monitoring sensor includes a temperature sensor, a humidity sensor, a salt spray sensor, a vibration sensor, a tilt sensor, an image camera, and a sound sensor.
[0012] Further preferably, the support column, inverted V-shaped support, air guide plate, outer shell, box door and ship side support are all stainless steel structural parts with mirror passivation surface treatment.
[0013] A further preferred embodiment is that the monitoring module also includes a surge protection module; Furthermore, a grounding bolt is fixed to the bottom of the outer casing.
[0014] A further preferred embodiment is that a Z-shaped groove is provided along the edge of the side opening of the outer casing; The edge of the box door is provided with an L-shaped protrusion; Sealing strips are fixed on the two surfaces of the Z-shaped groove that contact the L-shaped convex edge. When the door is closed, the L-shaped convex edge is located in the Z-shaped groove to achieve double abutment.
[0015] This utility model has positive effects: The structure of this utility model is reasonably designed. The inverted V-shaped support and the top surface of the monitoring box form an air guide channel, and the inverted V-shaped support and the air guide plate form an air inlet that is connected to the air guide channel. This not only effectively diverts rainwater, but also helps to improve wind and pressure resistance. It also forms an air insulation layer to improve the heat insulation effect. Furthermore, by setting up a solar panel, it is also conducive to achieving independent power supply, which improves the independence of the structure and solves the power supply problem in the offshore environment. Moreover, the monitoring box can be quickly installed and positioned by the ship's side support, which improves the overall structural stability and reliability. Meanwhile, its partition is set in the inner liner, and the partition divides the inner liner into different chambers; the monitoring module is set in different chambers, which facilitates equipment replacement and maintenance upgrade operations, helps to extend the service life of the overall structure, and also improves the convenience and effectiveness of installation and maintenance. The bottom wall of the outer casing is equipped with a cable hole and an emergency drainage hole; a corrugated fluororubber sealing ring and an epoxy waterproof sealant layer are installed between the cable hole and the data cable, which not only helps to improve the connection operation of the data cable, but also improves the sealing of the connection of the data cable and extends the service life of the overall structure. Ventilation holes are provided on the upper side wall of the outer casing, and the ventilation holes are located in the bottom shielding area of the air guide plate, which can improve the ventilation and heat dissipation performance inside the casing, and also ensure rainproof performance, making it highly versatile. The ship's side support includes a support plate, at least two inclined support rods, and at least two transverse support rods. One end of the transverse support rod is vertically adjustable and fixed in a vertical adjustment groove by a nut, and the other end is fixed in different mounting holes on the inclined support rod by bolts. The inclined support rod is supported and limited by the transverse support rods. The inclination angle of the inclined support rod can be adjusted as needed. The support plate, in conjunction with the transverse support rods, achieves the support and positioning of the inclined support rod, ensuring the stability and reliability of the monitoring box installation. It also facilitates the adjustment and control of the installation height and has strong applicability. The support columns, inverted V-shaped supports, air guides, outer shell, box doors, and ship hull supports are all stainless steel structural components with mirror-passivated surfaces, which can also improve corrosion resistance and reflective heat insulation capabilities. Attached Figure Description
[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a schematic diagram of the monitoring box and monitoring module in this utility model; Figure 4 This is a schematic diagram of the specific structure of the ship's side support in this utility model; Figure 5 This is a schematic diagram of the structure of the ship's side support and the monitoring box in this utility model; Figure 6 This is a schematic diagram of the structure at the connection between the outer shell and the door in this utility model; Figure 7 for Figure 2 Enlarged structural diagram of the emergency drainage hole in the middle.
[0017] Reference numerals: 1. Side bracket; 1-1. Support plate; 1-2. Inclined support rod; 1-3. Lateral support rod; 1-4. Vertical adjustment groove; 1-5. Universal ball joint; 1-6. Mounting hole; 1-7. Bolt. The monitoring box structure 2 includes a monitoring box body 21, an outer shell 211, a door 212, an inner liner 213, a partition 214, a monitoring module 22, a battery pack 221, a slide rail 222, and a mounting support plate 223. Solar panel structure 3, support column 31, inverted V-shaped support 32, solar panel body 33. 4. Air guide plate, 5. Air guide channel, 6. Air inlet, 7. Heat insulation plate, 8. Damping hinge, 9. Ventilation hole, 10. Wiring hole, 11. Emergency drainage hole, 12. Z-shaped groove, 13. L-shaped protrusion, 14. Sealing strip. Detailed Implementation
[0018] 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.
[0019] Example See Figures 1 to 7 As shown, a weather-resistant side monitoring box includes a ship's side bracket 1 fixed to the ship's side, a monitoring box structure 2 fixed to the ship's side bracket, and a solar panel structure 3 set on top of the monitoring box structure. The monitoring box structure 2 includes a monitoring box body 21 and a monitoring module 22 set inside the monitoring box body. In this embodiment, the ship's side bracket is fixed to the ship's side, and the dimensions of the monitoring box body are approximately 400mm long × 600mm wide × 400mm high. In this embodiment, the solar panel structure includes several pillars 31, inverted V-shaped supports 32, and several solar panel bodies 33. The pillars are mainly used for support, while the inverted V-shaped supports are mainly used for installing the solar panel bodies. The use of inverted V-shaped supports can also increase drainage and wind resistance. The above structure is specifically a stainless steel structure with a mirror-passivated surface, which can improve corrosion resistance and reflective heat insulation capabilities. During assembly, the bottom end of the pillar is fixed to the top end of the monitoring box, and the top end of the pillar is fixed to the bottom surface of the inverted V-shaped support. The edge of the inverted V-shaped support protrudes from the side of the monitoring box. Through the above structure, the upper side of the monitoring box can be protected. Meanwhile, a downwardly inclined air guide plate 4 is fixed to the top side of the monitoring box. An air guide channel 5 is formed between the bottom surface of the inverted V-shaped support and the top surface of the monitoring box. An air inlet 6 connected to the air guide channel is formed between the inverted V-shaped support and the air guide plate. The air guide plate is a stainless steel structure with a mirror-passive surface. The air guide plate is parallel to the edge of the inverted V-shaped support. It can not only waterproof and shield the upper part of the monitoring box, but also guide the air in conjunction with the inverted V-shaped support, thereby improving wind resistance. At the same time, it can also form an air insulation layer to improve the heat insulation effect. The air inlet can guide the air.
[0020] In this embodiment, the solar panel is embedded and fixed on the top slope of the inverted V-shaped support, and the solar panel is connected to the monitoring module. The monitoring module can be powered by the solar panel, solving the power supply problem in offshore environments and improving the structure's independence.
[0021] In this embodiment, the monitoring box 21 includes an outer shell 211, a door 212, an inner liner 213, and a partition 214. The outer shell has a wall thickness of 2mm and is made of SUS316L stainless steel with a mirror-passivated surface. The inner liner is located inside the outer shell, and a heat insulation plate 7 is provided between the inner liner and the outer shell. The heat insulation plate is a honeycomb heat insulation plate. Furthermore, the heat insulation plate is filled with a 5mm honeycomb panel inside the shell, specifically a honeycomb panel made of materials such as aluminum alloy.
[0022] Meanwhile, the enclosure door is connected to the side opening of the outer shell via a damping hinge 8, and the bottom and sides of the outer shell are fixed to the ship's side support. A partition is installed inside the inner liner, dividing it into different chambers. Monitoring modules are installed within these chambers. An air guide plate is fixed to the top edge of the outer shell's side, and ventilation holes 9 are provided on the upper part of the outer shell's side wall, located within the bottom shielding area of the air guide plate. These ventilation holes facilitate ventilation and heat dissipation inside the outer shell, improving heat dissipation performance. Furthermore, the location of the ventilation holes within the bottom shielding area of the air guide plate prevents rainwater from entering the interior, enhancing safety and effectiveness.
[0023] In this embodiment, a wiring hole 10 and an emergency drainage hole 11 are provided on the bottom wall of the outer casing. During use, a corrugated fluororubber sealing ring and an epoxy waterproof sealant layer are provided between the wiring hole and the data cable. The wiring hole achieves an IP68 protection rating, improving safety and reliability. Meanwhile, the emergency drainage hole is a U-shaped hole, ensuring drainage while also protecting the internal structure.
[0024] In this embodiment, the ship's side bracket 1 includes a support plate 1-1, at least two inclined support rods 1-2, and at least two transverse support rods 1-3. During assembly, the support plate is fixed to the side of the ship's side, and the support plate is provided with at least two parallel vertical adjustment slots 1-4. The support plate uses a strong magnetic fixing plate with self-locking screws to fix it to the side plates of different thicknesses and materials, improving the stability and reliability of the installation. The vertical adjustment slots facilitate the adjustment of the lifting position of the transverse support rods, so that the outer end of the transverse support rod can be connected to different mounting holes on the inclined support rod, changing the angle between the inclined support rod and the support plate, thereby meeting the installation requirements of different shells and expanding its applicability.
[0025] Furthermore, the bottom end of the inclined support rod is rotatably connected to the lower part of the support plate via a universal ball joint 1-5, and the upper part of the inclined support rod is provided with several mounting holes 1-6 aligned vertically. During assembly, one end of the transverse support rod is vertically adjustable and fixed in the vertical adjustment groove via a nut, and the other end is fixed in different mounting holes on the inclined support rod via bolts 1-7. The inclined support rod is supported and limited by the transverse support rod. The bottom of the outer shell is rotatably connected to the inclined support rod via a connecting shaft, and the side of the outer shell is welded and fixed to the upper part of the support plate. This structure ensures the stability and reliability of the outer shell during installation.
[0026] In this embodiment, the monitoring module 22 includes a battery pack 221, a monitoring controller, several monitoring sensors, a slide rail 222, and a mounting support plate 223. In this embodiment, the monitoring controller and monitoring sensors are conventional structures from the prior art, and therefore are not described in detail; they are simply applied. The monitoring sensors include a temperature sensor, a humidity sensor, a salt spray sensor, a vibration sensor, a tilt sensor, an image camera, and a sound sensor. In practical applications, other sensors can be selected for detection as needed. The monitoring sensors are mounted on the housing and connected to the monitoring controller via a data bus or wireless communication interface. The data bus may include RS485, CAN bus, or a power supply data line, etc. During installation, the battery pack is placed in one of the chambers; the slide rail is fixed to the inner wall of one of the chambers; the mounting support plate is provided with a number of mounting holes, the monitoring controller is placed in the mounting holes of the mounting support plate, and the mounting support plate can be slidably placed on the slide rail; through the above structure, the mounting holes on the mounting support plate facilitate the installation and maintenance of the monitoring controller, and also improve the stability and reliability of the installation.
[0027] In this embodiment, the support column, inverted V-shaped support, air guide plate, outer shell, box door, and ship's side support are all stainless steel structural components with mirror-polished surfaces. Mirror-polished stainless steel structural components improve corrosion resistance and reflective heat insulation performance.
[0028] Furthermore, in practical applications, the monitoring module also includes a surge protection module; and a grounding bolt is fixed to the bottom of the housing. This improves the overall structural safety and stability.
[0029] In this embodiment, a Z-shaped groove 12 is provided along the edge of the side opening of the outer shell; an L-shaped protrusion 13 is provided along the edge of the door; sealing strips are fixed to the two surfaces of the Z-shaped groove that contact the L-shaped protrusion, respectively. When the door is closed in use, the L-shaped protrusion is positioned within the Z-shaped groove to achieve double abutment. In practical applications, sealing strips 14 are fixed to the two surfaces of the Z-shaped groove that contact the L-shaped protrusion to improve sealing performance. This is a common structure in the prior art and is therefore not described in detail.
[0030] This utility model has positive effects: The structure of this utility model is reasonably designed. The inverted V-shaped support and the top surface of the monitoring box form an air guide channel, and the inverted V-shaped support and the air guide plate form an air inlet that is connected to the air guide channel. This not only effectively diverts rainwater, but also helps to improve wind and pressure resistance. It also forms an air insulation layer to improve the heat insulation effect. Furthermore, by setting up a solar panel, it is also conducive to achieving independent power supply, which improves the independence of the structure and solves the power supply problem in the offshore environment. Moreover, the monitoring box can be quickly installed and positioned by the ship's side support, which improves the overall structural stability and reliability. Meanwhile, its partition is set in the inner liner, and the partition divides the inner liner into different chambers; the monitoring module is set in different chambers, which facilitates equipment replacement and maintenance upgrade operations, helps to extend the service life of the overall structure, and also improves the convenience and effectiveness of installation and maintenance. The bottom wall of the outer casing is equipped with a cable hole and an emergency drainage hole; a corrugated fluororubber sealing ring and an epoxy waterproof sealant layer are installed between the cable hole and the data cable, which not only helps to improve the connection operation of the data cable, but also improves the sealing of the connection of the data cable and extends the service life of the overall structure. Ventilation holes are provided on the upper side wall of the outer casing, and the ventilation holes are located in the bottom shielding area of the air guide plate, which can improve the ventilation and heat dissipation performance inside the casing, and also ensure rainproof performance, making it highly versatile. The ship's side support includes a support plate, at least two inclined support rods, and at least two transverse support rods. One end of the transverse support rod is vertically adjustable and fixed in a vertical adjustment groove by a nut, and the other end is fixed in different mounting holes on the inclined support rod by bolts. The inclined support rod is supported and limited by the transverse support rods. The inclination angle of the inclined support rod can be adjusted as needed. The support plate, in conjunction with the transverse support rods, achieves the support and positioning of the inclined support rod, ensuring the stability and reliability of the monitoring box installation. It also facilitates the adjustment and control of the installation height and has strong applicability. The support columns, inverted V-shaped supports, air guides, outer shell, box doors, and ship hull supports are all stainless steel structural components with mirror-passivated surfaces, which can also improve corrosion resistance and reflective heat insulation capabilities.
[0031] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.
[0032] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.
Claims
1. A weather-resistant side monitoring box, comprising a ship's side bracket fixed to the ship's side, a monitoring box structure fixed to the ship's side bracket, and a solar panel structure disposed on top of the monitoring box structure, characterized in that: The monitoring box structure includes a monitoring box body and a monitoring module installed inside the monitoring box body; The solar panel structure includes several pillars, inverted V-shaped supports, and several solar panel bodies; The bottom end of the support column is fixed to the top end of the monitoring box, and the top end of the support column is fixed to the bottom surface of the inverted V-shaped support. The edge of the inverted V-shaped support protrudes from the side of the monitoring box; The top side of the monitoring box is fixed with a downwardly inclined air guide plate. An air guide channel is formed between the bottom surface of the inverted V-shaped support and the top surface of the monitoring box. An air inlet is formed between the inverted V-shaped support and the air guide plate, which is connected to the air guide channel. The solar panel is embedded and fixed on the top slope of the inverted V-shaped support, and the solar panel is connected to the monitoring module.
2. The weather-resistant side monitoring box according to claim 1, characterized in that: The monitoring enclosure includes an outer shell, a door, an inner liner, and partitions; The inner liner is located inside the outer shell, and a heat insulation plate is provided between the inner liner and the outer shell; The box door is connected to the side opening of the outer shell via a damping hinge, and the bottom and sides of the outer shell are fixed to the ship's side support. The partition is disposed in the inner liner and divides the inner liner into different chambers; The monitoring modules are installed in different chambers; The air guide plate is fixed to the top edge of the side of the outer casing, and the upper part of the side wall of the outer casing is provided with ventilation holes, which are located in the bottom shielding area of the air guide plate. The insulation board is a honeycomb insulation board.
3. A weather-resistant side-mounted monitoring box according to claim 2, characterized in that: The bottom wall of the outer casing is provided with a wire hole and an emergency drainage hole; A corrugated fluororubber sealing ring and an epoxy waterproof adhesive sealing layer are provided between the wire hole and the data cable.
4. A weather-resistant side-mounted monitoring box according to claim 3, characterized in that: The emergency drainage hole is a ┐-shaped hole.
5. A weather-resistant side monitoring box according to claim 2, characterized in that: The ship's side support includes a support plate, at least two inclined support rods, and at least two transverse support rods; The support plate is fixed to the side of the ship's side, and the support plate is provided with at least two parallel vertical adjustment grooves. The bottom end of the inclined support rod is rotatably connected to the lower part of the support plate via a universal ball joint, and the upper part of the inclined support rod is provided with a number of mounting holes in the same vertical line. One end of the horizontal support rod is fixed in the vertical adjustment groove by a nut, and the other end is fixed in different mounting holes on the inclined support rod by bolts. The inclined support rod is supported and limited by the horizontal support rod. The bottom of the outer shell is rotatably connected to the inclined support rod via a connecting shaft, and the side of the outer shell is welded and fixed to the upper part of the support plate.
6. A weather-resistant side-mounted monitoring box according to claim 2, characterized in that: The monitoring module includes a battery pack, a monitoring controller, several monitoring sensors, a slide rail, and a mounting support plate; The battery pack is disposed in one of the chambers; The slide rail is fixed to the inner wall of one of the chambers; The mounting support plate is provided with a plurality of mounting holes, the monitoring controller is disposed on the mounting holes of the mounting support plate, and the mounting support plate can be slidably disposed on the slide rail; The monitoring sensor is mounted on the housing and connected to the monitoring controller via a data bus or wireless communication interface.
7. A weather-resistant side monitoring box according to claim 6, characterized in that: The monitoring sensors include a temperature sensor, a humidity sensor, a salt spray sensor, a vibration sensor, a tilt sensor, an image camera, and a sound sensor.
8. A weather-resistant side-mounted monitoring box according to claim 2, characterized in that: The support column, inverted V-shaped support, air guide plate, outer shell, box door and ship side support are all stainless steel structural components with mirror passivation surface treatment.
9. A weather-resistant side monitoring box according to claim 8, characterized in that: The monitoring module also includes a surge protection module; Furthermore, a grounding bolt is fixed to the bottom of the outer casing.
10. A weather-resistant side monitoring box according to claim 2, characterized in that: The side opening of the outer casing is provided with a Z-shaped groove along its edge; The edge of the box door is provided with an L-shaped protrusion; Sealing strips are fixed on the two surfaces of the Z-shaped groove that contact the L-shaped convex edge. When the door is closed, the L-shaped convex edge is located in the Z-shaped groove to achieve double abutment.