Wharf low-voltage junction box

Abstract

The wharf low-voltage junction box comprises a box body and a box door, the box body is defined by a front plate, a rear plate, a first side plate, a second side plate, a top plate and a bottom plate, a box opening is formed in the top plate, the box door is arranged at the box opening, the two adjacent edges of the bottom plate are a long edge and a short edge respectively, the length of the long edge is larger than or equal to that of the short edge, and the vertical distance from the top plate to the bottom plate is smaller than that of the long edge; a mounting cavity, a mounting frame and a conveying pipe are arranged in the box body, a gas fire extinguisher and a control part are arranged in the mounting cavity, the mounting frame comprises a long stand column and a short stand column, and a mounting hole and a fixing hole are formed in the long stand column; the conveying pipe is annular, penetrates through the mounting hole and surrounds the outer wall of the mounting cavity, and an air outlet hole is formed in the conveying pipe; according to the invention, initial prevention and control and rapid disposal of a junction box fire are realized; the long stand columns and the short stand columns not only can stably support the box body, but also can be used for fixing conveying pipes and various electrical elements; and a horizontal structure is adopted, so that wharf cargo hoisting is facilitated, and meanwhile, the internal space utilization rate is optimized.

Description

Technical Field

[0001] This invention belongs to the field of junction box technology, specifically relating to a low-voltage junction box for docks. Background Technology

[0002] When ships are docked at a pier or undergoing maintenance in dry dock, they usually need to be connected to shore power. For liner ships with fixed routes, the piers where they dock are equipped with shore power connection devices. After the ship docks, it can directly use shore power, and the ship's generator sets can be completely shut down. This can reduce the number of on-site personnel and create conditions for the routine maintenance and repair of the generator sets.

[0003] Low-voltage junction boxes used at docks typically consist of a box body, a door, sockets installed on the box, and various integrated electrical components. Existing standard low-voltage junction boxes include circuit breakers, limit switches, surge protectors, indicator lights, and other electrical components. Intelligent modules can also be selected based on actual usage requirements; these modules usually feature remote monitoring, data logging, alarm management, access control, and integration with port management systems. To ensure electrical safety, existing junction boxes are equipped with multiple safety protection measures. For example, the box body uses specialized materials suitable for the high humidity, heat, and salt spray environment of coastal areas; the electrical components are made of weather-resistant, flame-retardant, moisture-resistant, and mildew-resistant materials; and short-circuit protection, overload protection, and leakage protection devices are also included.

[0004] Although the safety design of existing low-voltage junction boxes at docks is relatively sound, the following problems still exist in practical applications: 1. In terms of structural design, most existing junction boxes adopt a vertical structure, which results in a relatively high overall installation height. During cargo hoisting operations at the dock, the hoisted cargo may collide with the box, causing equipment damage or operational safety hazards. 2. Regarding emergency response, even with multiple electrical safety protection measures in place, junction boxes can still cause fires due to electrical faults. Most existing junction boxes rely on manual inspections to detect potential fire hazards. This method is significantly delayed, failing to detect and address fires in their early stages. Furthermore, existing junction boxes only have fire alarm functions and lack active fire suppression capabilities. After a fire breaks out, personnel must rely on fire extinguishers and other firefighting equipment available at the dock to conduct manual firefighting operations. There is a time lag between receiving the alarm and arriving at the scene to complete the response, during which time the fire can easily spread and escalate, causing not only severe property damage but also potential casualties and posing significant safety hazards. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a low-voltage junction box for docks that can promptly respond to sudden fires.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a low-voltage junction box for a dock, comprising a box body and a box door. The box body is formed by a front plate, a rear plate, a first side plate, a second side plate, a top plate, and a bottom plate. The front plate and rear plate are arranged opposite to each other, the first side plate and the second side plate are arranged opposite to each other, and the top plate and the bottom plate are arranged opposite to each other. The first side plate and the second side plate are each provided with side mounting holes. The front plate is provided with a front mounting hole. The top plate is provided with a box opening. The box door is located at the box opening and is rotatably connected to the box opening. The box door is fixed to the front plate by a latch. The bottom plate has a long side and a short side on two adjacent sides, with the length of the long side being greater than or equal to the length of the short side. The vertical distance from the top plate to the bottom plate is less than the length of the long side. An integrally formed mounting cavity is formed at the connection between the front plate and the first side plate. The mounting cavity includes an opening and a connecting hole located on the adjacent side wall. The opening is located on the front plate and / or the first side plate. A gas fire extinguisher and control components are installed within the mounting cavity. The gas fire extinguisher includes a solenoid valve and a nozzle. The solenoid valve is a normally closed solenoid valve. A mounting bracket and a delivery pipe are provided inside the housing. A connecting delivery pipe is installed within the connecting hole. The mounting bracket includes three long columns and one short column, both of which are square tubular. The three long columns are respectively positioned at the connections between side plate one and the rear plate, side plate two and the rear plate, and side plate two and the front plate. The short column is positioned at the connection between side plate one and the front plate, with its end facing the mounting cavity abutting against the outer wall of the mounting cavity facing the top plate. Each long column has mounting holes and multiple fixing holes. The conveying pipe is generally annular and passes through the mounting holes of the three long columns sequentially, surrounding the mounting cavity. The outer wall of the conveying pipe has multiple air vents evenly arranged along its extension direction. The control unit includes a power supply, a temperature sensor, a communication module, and a main control module. The temperature sensor is installed on the inner wall of the housing and is electrically connected to the main control module. The power supply includes a battery and an external power supply, which simultaneously supplies power to the solenoid valve, the temperature sensor, the communication module, and the main control module. The main control module is electrically connected to the temperature sensor, the communication module, and the solenoid valve, respectively. The main control module has pre-stored normal operating temperature threshold, temperature rise rate threshold, and predetermined monitoring time.

[0007] With the above solution, after being put into use, the base plate is laid facing the ground; the side mounting holes are used to install sockets, and there are multiple front mounting holes of different shapes to accommodate the installation and fixing of different types of electrical components such as displays, indicator lights, and buttons.

[0008] During normal operation of the junction box, the control components are powered by an external power supply, which is shared with other electrical components inside the box, thus achieving integrated power utilization. The temperature sensor on the inner wall of the box continuously collects temperature data. Regardless of whether the junction box is in a normal power supply state or a fault power failure state, the temperature monitoring work is uninterrupted. The main control module always maintains real-time data transmission to ensure timely detection of abnormal temperatures inside the box.

[0009] The entire process of troubleshooting a junction box malfunction, from its initial occurrence to its resolution, is shown below: Step 1: When the junction box experiences localized heating and rapid temperature rise due to electrical faults such as internal short circuits, overloads, or poor contact at the wiring terminals, the main control module receives real-time temperature data from the temperature sensor and automatically calculates the temperature change slope according to the preset monitoring time. It compares the actual temperature rise rate with a pre-stored temperature rise rate threshold (e.g., a temperature rise ≥20℃ within 1 minute) to determine if there is a fire hazard. During this period, if an electrical fault causes a power supply abnormality, the power supply automatically switches from external power to battery power. The battery can be a disposable battery (replaced periodically by staff) or a rechargeable battery (charged by an external power source during normal operation of the junction box) to ensure continuous operation of the control components. Step 2: If the actual temperature rise rate is less than the pre-stored temperature rise rate threshold, it indicates that there is only a slight temperature abnormality inside the box and there is no fire risk. The main control module maintains a low-power standby state and continuously monitors temperature changes. If the actual temperature rise rate is greater than or equal to the pre-stored temperature rise rate threshold, it indicates that there are initial signs of fire inside the box. The main control module immediately sends a continuous electrical signal to the solenoid valve to ensure that the solenoid valve opens stably and avoids the solenoid valve from failing midway due to signal interruption, which would affect the fire extinguishing effect. Step 3: After the solenoid valve is fully opened, the gas fire extinguisher uses its own stored pressure to spray the extinguishing agent from the nozzle and quickly deliver it through the delivery pipeline. It is then sprayed into the interior of the box through the gas outlet. The extinguishing agent can quickly cover all areas inside the box, effectively isolating oxygen and inhibiting the combustion reaction. In the early stage of a fire (without open flames or small flames), it can quickly suppress and extinguish the fire, effectively curbing the spread of the fire and preventing the fire from damaging the electrical components inside the box and the equipment around the dock. Step 4: After the fire is extinguished, the temperature inside the junction box gradually drops. The temperature sensor continuously monitors the temperature change. When it is confirmed that the temperature inside the box has dropped to the preset normal operating temperature and the temperature rise rate has returned to 0, the main control module stops outputting trigger electrical signals to the solenoid valve and sends a fire extinguishing completion notification to the dock staff through the communication module. The preset normal operating temperature threshold is determined by the manufacturer after the device is delivered to the site and installed, taking into account factors such as actual on-site test data and the temperature change patterns of the installation site over the years, to ensure the accuracy of temperature judgment. Step 5: After the solenoid valve loses the electrical signal from the main control module, it automatically resets to the normally closed state through its own reset mechanism, cutting off the extinguishing agent discharge circuit, so that the gas fire extinguisher stops delivering extinguishing agent, avoiding excessive consumption of extinguishing agent, and facilitating subsequent equipment maintenance and extinguishing agent replenishment. Step Six: After receiving the notification and arriving at the scene, the staff will first conduct a comprehensive investigation into the cause of the junction box fire, complete the fault repair work, and completely eliminate the risk of secondary fire. Then, they will check the remaining amount of extinguishing agent in the gas fire extinguisher, the integrity of the external power supply wiring, the closed status of the solenoid valve, the sealing of the delivery pipe, and the reliability of the temperature sensor to ensure that all the performance of the device is restored to normal. Step 7: After completing all maintenance and reset operations, the staff manually switches the power supply to external power. The main control module re-enters low-power standby mode, and the temperature sensor continues to collect temperature data inside the chamber.

[0010] Compared with the prior art, the present invention has the following advantages: 1. It enables the initial prevention and rapid response to junction box fires, and can promptly trigger the fire extinguishing process in the early stages of a fire, effectively preventing the disaster from escalating and ensuring the safety of electrical equipment and personnel at the dock. 2. Adopting a dual power supply mode ensures that the main control module, temperature sensor, and solenoid valve can still work normally at all times when the junction box loses power, solving the shortcomings of traditional junction boxes that cannot monitor fire hazards or automatically extinguish fires after power loss, and improving the stability and reliability of fire prevention and control. 3. Using the "temperature rise rate within a predetermined time" as the fire extinguishing trigger condition, instead of the traditional constant temperature triggering method, it can effectively avoid false triggering caused by non-fire factors such as high ambient temperature and short-term overload, and accurately capture the rapid temperature rise process after the junction box catches fire, so as to achieve timely response and handling in the early stage of fire. 4. The long and short columns of the mounting frame can provide stable support for the box, and the mounting holes and fixing holes on them can be used to fix the conveying pipes and various electrical components. It has a high degree of integration and strong practicality. 5. The independently designed installation chamber prevents the gas fire extinguisher from being affected by the extinguishing agent, ensuring its normal operation. The location of the chamber opening facilitates the installation and maintenance of the gas fire extinguisher and control components, allowing staff to check the status of the gas fire extinguisher without opening the cabinet door, and enabling timely replacement if it fails.

[0011] 6. Adopting a horizontal structure, it has a low center of gravity and strong stability, making it suitable for the vibration environment of the dock. With a moderate height and reasonable footprint, it not only facilitates the hoisting and transfer of cargo at the dock, but also reduces the workload of operators in installation and maintenance, improves the safety and convenience of operation, optimizes the utilization of internal space, and enhances the adaptability to harsh environments.

[0012] It should be noted that the types, quantities, and arrangement of electrical components in the junction box can be flexibly configured according to the actual situation such as the low-voltage power supply requirements and installation space at the dock site; the delivery pipe can be assembled from multiple straight and bent pipes, and the delivery pipe and the connecting pipe are connected by a tee pipe, and the pipes are connected by quick connectors. The specific connection method is the existing conventional technology. This invention does not involve any improvement to the pipe connection structure. Installers can connect them according to conventional methods.

[0013] As a further feature of the present invention, the mounting holes include mounting hole one and mounting hole two disposed on adjacent side walls of the long column. The conveying pipe passes through both mounting hole one and mounting hole two. Mounting hole one is a circular hole with the same outer diameter as the conveying pipe. Mounting hole two is an elongated hole. Mounting hole two has a mounting groove smaller than or equal to a semicircle on the hole wall away from the top plate. The distance between the hole wall of mounting hole two near the top plate and the hole wall away from the top plate is greater than twice the outer diameter of the conveying pipe.

[0014] Using the above scheme, mounting hole one and mounting hole two adopt a differentiated hole shape design, which facilitates the assembly and positioning of the conveying pipe; the conveying pipe can be pre-assembled with the mounting frame and then assembled into the box as a whole, which significantly improves assembly efficiency and structural stability.

[0015] As a further feature of the present invention, the outer wall of the conveying pipe is provided with a plurality of sleeves, and a limiting structure is provided between the sleeves and the conveying pipe to restrict the sleeves from moving along the axial direction of the conveying pipe. The length of the sleeves along the extension direction of the conveying pipe is greater than the width of the air outlet along the extension direction of the conveying pipe, and less than the distance between two adjacent air outlets.

[0016] By applying force to the sleeve, the constraint of the limiting structure can be released, and the position of the sleeve along the extension direction of the delivery pipe can be adjusted. By moving the sleeve, the air outlet can be covered or opened accordingly, thereby controlling the spray position and spray area of ​​the extinguishing agent.

[0017] Because the layout of electrical components inside the container varies depending on the actual usage environment at the dock, some vents are easily blocked by electrical components, leading to poor extinguishing agent ventilation and reduced extinguishing effectiveness. This invention addresses this by flexibly adjusting the pipe sleeve position to avoid blocked vents and open unobstructed vents, allowing the extinguishing agent to diffuse more evenly and efficiently into key areas within the container, significantly improving the early response speed and extinguishing effect.

[0018] As a further feature of the present invention, the limiting structure is an internal thread provided on the inner wall of the sleeve and an external thread provided on the outer wall of the conveying pipe that can mate with the internal thread. The external thread is provided in segments along the extension direction of the conveying pipe, and external threads are provided on both sides of the air outlet. The length of the sleeve along the extension direction of the conveying pipe is greater than the distance between the two external threads on both sides of the corresponding air outlet.

[0019] The above solution features a simple overall structure and is easy to assemble and operate. Through the cooperation of internal and external threads, the position of the sleeve along the extension direction of the conveying pipe can be quickly adjusted and reliably positioned, ensuring stability and reliability during use.

[0020] As a further feature of the present invention, the mounting frame also includes an upper crossbeam and a lower crossbeam, both of which are square tubular. The upper crossbeam is arranged around the edge of the box opening and its ends are connected to form a ring. The upper crossbeam is fixedly connected to the ends of three long columns away from the bottom plate and the end of one short column away from the bottom plate. The upper crossbeam has multiple upper connecting holes along its extension direction. The lower crossbeam extends along the edge of the bottom plate, and its two ends abut against the two outer walls adjacent to the mounting cavity. The lower crossbeam is fixedly connected to the ends of the three long columns away from the top plate. The lower crossbeam has lower connecting holes corresponding to the upper connecting holes.

[0021] By adopting the above solution, the mounting bracket can be installed in close contact with the inner wall of the enclosure, which effectively improves the load-bearing capacity and stability of the entire mounting bracket. At the same time, it provides convenient conditions for flexibly designing the routing and fixing position according to the actual layout of electrical components inside the enclosure. It has strong adaptability and greatly facilitates the subsequent assembly and installation of electrical components, thereby improving the overall assembly efficiency.

[0022] As a further feature of the present invention, the mounting frame also includes a movable column, which includes an upper connecting end, a lower connecting end, and a mating hole. The movable column is fixed to the upper crossbeam by upper bolts passing through the upper connecting end and the upper connecting hole, and the movable column is fixed to the lower crossbeam by lower bolts passing through the lower connecting end and the lower connecting hole. At least one of the movable columns is positioned opposite the front plate. When the movable column is fixed to both the upper and lower crossbeams, the distance between the movable column and the inner wall of the box opposite to it is greater than the outer diameter of the conveying pipe.

[0023] Using the above scheme, the movable columns can reliably support the upper and lower crossbeams without interfering with the normal layout of the conveying pipes, effectively improving the overall rigidity and structural stability of the mounting frame, preventing deformation during use, and ensuring the stable and reliable relative positions of the electrical components inside the enclosure. The mating holes are used to fix the electrical components. The number and installation position of the movable columns can be flexibly adjusted according to the enclosure size, the number, specifications, and layout of the electrical components, facilitating the subsequent installation, fixing, and wiring of various electrical components, significantly improving the adaptability and assembly versatility of the device.

[0024] As a further feature of the present invention, a fixing seat is provided on the surface of the movable column facing the inner wall of the box, and a fixing groove less than or equal to a semicircle is provided on the surface of the fixing seat facing the top plate, and the outer wall of the conveying pipe abuts against the groove wall of the fixing groove.

[0025] The above solution is particularly suitable for larger enclosures. The movable support column, while facilitating the installation and fixing of electrical components, provides reliable support and restraint for the delivery pipe via the fixed base. This effectively prevents problems such as collapse and deformation of the delivery pipe during long-term use, ensuring stable and smooth delivery of the extinguishing agent within the pipe and guaranteeing the reliability and response stability of the fire extinguishing system.

[0026] As a further feature of the present invention, two symmetrically arranged fixing ends are fixed on the inner wall of the mounting cavity, and the ends of the two fixing ends away from the mounting cavity are connected by hooks, and the two fixing ends and the hooks surround the periphery of the gas fire extinguisher.

[0027] Using the above-mentioned design, the gas fire extinguisher generates a certain recoil force when spraying the extinguishing agent. The symmetrically arranged fixed ends provide circumferential restraint, effectively preventing tilting or displacement during spraying. This ensures a stable spray direction and smooth spray path, avoiding any impact on extinguishing effectiveness due to extinguisher deviation. Simultaneously, the hooks allow for quick opening, closing, and locking, facilitating installation, inspection, and replacement by personnel, thus improving the convenience and operability of equipment maintenance.

[0028] As a further feature of the present invention, a cylindrical groove is provided on the surface of the mounting cavity away from the top plate, and the groove is disposed opposite to the fixing end.

[0029] By adopting the above scheme, the cylindrical groove can cooperate and work together with the fixed end to form multi-point positioning and constraint for the gas fire extinguisher, further improving the installation stability of the gas fire extinguisher and enhancing the overall working reliability of the fire extinguishing device.

[0030] As a further feature of the present invention, a safety door is provided at the opening of the mounting cavity, and the safety door is provided with a handle and an observation window closed by a transparent panel.

[0031] Using the above solution, the safety door can effectively protect the gas fire extinguisher and related components inside the installation cavity, preventing external impacts, dust or moisture from entering and affecting the normal operation of the device; the transparent observation window allows staff to directly view the pressure gauge reading of the gas fire extinguisher without opening the safety door, quickly confirming whether the gas fire extinguisher pressure is normal, greatly improving the convenience and efficiency of daily equipment inspection.

[0032] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0033] Appendix Figure 1 This is an external schematic diagram of a specific embodiment of the present invention; Appendix Figure 2This is a schematic diagram of the internal structure of a specific embodiment of the present invention; Appendix Figure 3 This is a schematic diagram of the casing according to a specific embodiment of the present invention; Appendix Figure 4 This is a diagram showing the fit between the gas fire extinguisher and the mounting cavity in a specific embodiment of the present invention; Appendix Figure 5 This is a schematic diagram of the mounting bracket according to a specific embodiment of the present invention; Appendix Figure 6 This is a schematic diagram of the long column and the conveying pipe in a specific embodiment of the present invention; Appendix Figure 7 This is a schematic diagram of the cooperation between the movable column and the conveying pipe in a specific embodiment of the present invention; Appendix Figure 8 This is a schematic diagram showing the air outlet open in a specific embodiment of the present invention; Appendix Figure 9 This is a schematic diagram showing the vent shielding in a specific embodiment of the present invention.

[0034] Box body 1, front panel 11, rear panel 12, side panel 13, side panel 2 14, top panel 15, box opening 151, bottom plate 16, side mounting hole 17, front mounting hole 18, mounting cavity 19, cavity opening 191, connecting hole 192, fixing end 193, hook 194, groove 195, box door 2, gas fire extinguisher 3, solenoid valve 31, nozzle 32, control components 4, connecting pipe 5, mounting bracket 6, long column 61, mounting hole 1 611. Mounting hole 612, mounting groove 6121, fixing hole 613, short column 62, upper crossbeam 63, upper connecting hole 631, lower crossbeam 64, lower connecting hole 641, movable column 65, upper connecting end 651, lower connecting end 652, mating hole 653, fixing seat 654, fixing groove 655, conveying pipe 7, air outlet 71, external thread 72, pipe sleeve 8, internal thread 81, safety door 9, handle 91, observation window 92. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that, unless otherwise specified, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, to more clearly show the various components and the mating relationships between them, some components in the accompanying drawings may be enlarged, reduced, or simplified; the dimensional relationships and shapes in the accompanying drawings should not be directly interpreted as actual dimensions and shapes.

[0037] Specific embodiments of the present invention are shown in the accompanying drawings.

[0038] A low-voltage junction box for a dock includes a box body 1 and a door 2. The box body 1 is formed by a front plate 11, a rear plate 12, a first side plate 13, a second side plate 14, a top plate 15, and a bottom plate 16. The front plate 11 and the rear plate 12 are arranged opposite each other, the first side plate 13 and the second side plate 14 are arranged opposite each other, and the top plate 15 and the bottom plate 16 are arranged opposite each other. The top plate 15 has a box opening 151, and the door 2 is located at the box opening 151. The door 2 is rotatably connected to the box opening 151. The door 2 is fixed to the front plate 11 by a latch. The first side plate 13 and the second side plate 14 are each provided with a side mounting hole 17, and the front plate 11 is provided with a front mounting hole 18. The side mounting holes 17 are used to install sockets. There are multiple front mounting holes 18 with different shapes to accommodate the installation and fixing of different types of electrical components such as displays, indicator lights, and buttons.

[0039] The two adjacent sides of the bottom plate 16 are the long side and the short side, respectively. The length of the long side is greater than or equal to the length of the short side. The vertical distance from the top plate 15 to the bottom plate 16 is less than the length of the long side. In this embodiment, a horizontal structure is adopted. After being put into use, the bottom plate 16 is laid facing the ground. Compared with the existing vertical junction box, this structure has the following advantages: (1) The overall center of gravity is lower, which can effectively resist the vibration generated by the hoisting of cargo and the passage of vehicles at the dock and reduce the risk of tipping over; (2) It is suitable for the narrow installation space at the dock and avoids interference with cargo hoisting operations, which facilitates the normal hoisting and circulation of cargo at the dock; (3) It can make the layout of electrical components in the box 1 more reasonable, optimize the utilization rate of internal space, and ensure the long-term stable and reliable operation of the equipment.

[0040] The front panel 11 and the side panel 13 are integrally formed with an installation cavity 19. The installation cavity 19 includes a cavity opening 191 and a connecting hole 192 provided on the adjacent side wall. The cavity opening 191 is provided on the front panel 11. A gas fire extinguisher 3 and a control component 4 are provided in the installation cavity 19. The gas fire extinguisher 3 includes a solenoid valve 31 and a nozzle 32. The solenoid valve 31 is a normally closed solenoid valve 31. A connecting pipe 5 connecting the delivery pipe 7 and the nozzle 32 is provided in the connecting hole 192.

[0041] The housing 1 contains a mounting frame 6 and a conveying pipe 7. The mounting frame 6 includes a long column 61, a short column 62, an upper crossbeam 63, a lower crossbeam 64, and a movable column 65. The long column 61, short column 62, upper crossbeam 63, and lower crossbeam 64 all adopt a square tubular structure, which is structurally regular and has excellent load-bearing capacity. There are three long columns 61, which are respectively located at the connection between side plate 13 and rear plate 12, side plate 2 14 and rear plate 12, and side plate 2 14 and front plate 11. There is one short column 62, which is located at the connection between side plate 13 and front plate 11. The end of the short column 62 facing the mounting cavity 19 is connected to the top plate of the mounting cavity 19. The outer wall of the 15 abuts against the long column 61, which is provided with mounting hole 1 611, mounting hole 2 612 and multiple fixing holes 613. In this embodiment, the fixing holes 613 have multiple sizes. Mounting hole 1 611 and mounting hole 2 612 are provided on the adjacent side walls of the long column 61. The conveying pipe 7 is generally annular and passes through the mounting holes 1 611 and mounting holes 2 612 of the three long columns 61 in sequence, and surrounds the outer wall of the mounting cavity 19. In this embodiment, the two adjacent outer walls of the mounting cavity 19 are provided with bosses that play a role in positioning and supporting the conveying pipe 7. The side wall of the conveying pipe 7 is provided with multiple air outlet holes 71 evenly arranged along its extension direction. The upper crossbeam 63 is arranged around the edge of the box opening 151, and its ends are connected to form a ring. The upper crossbeam 63 is fixedly connected to the ends of the three long columns 61 away from the bottom plate 16 and the end of the short column 62 away from the bottom plate 16. The lower crossbeam 64 extends along the edge of the bottom plate 16, and its two ends abut against the two outer walls adjacent to the mounting cavity 19. The lower crossbeam 64 is fixedly connected to the ends of the three long columns 61 away from the top plate 15. The upper crossbeam 63 has multiple upper connecting holes 631 along its extension direction, and the lower crossbeam 64 has lower connecting holes 641 corresponding to the upper connecting holes 631.

[0042] The long column 61, short column 62, upper crossbeam 63, and lower crossbeam 64 work together to ensure that the mounting frame 6 fits tightly against the inner wall of the enclosure 1, effectively improving the load-bearing capacity and stability of the entire mounting frame 6. At the same time, it provides convenience for subsequent installation. The installation direction and fixed position can be flexibly designed according to the actual layout of electrical components inside the enclosure 1. It has strong adaptability and greatly improves the efficiency of subsequent assembly and installation of electrical components.

[0043] The movable column 65 includes an upper connecting end 651, a lower connecting end 652, and a mating hole 653. The movable column 65 is fixed to the upper crossbeam 63 by upper bolts passing through the upper connecting end 651 and the upper connecting hole 631. The movable column 65 is fixed to the lower crossbeam 64 by lower bolts passing through the lower connecting end 652 and the lower connecting hole 641. In this embodiment, four movable columns 65 are provided, which are evenly distributed in positions opposite to the front plate 11 and opposite to the rear plate 12. When the movable column 65 is fixed to both the upper crossbeam 63 and the lower crossbeam 64, the distance between the movable column 65 and the inner wall of the box 1 opposite to it is greater than the outer diameter of the conveying pipe 7, so as to reserve sufficient space for the layout of the conveying pipe 7. The movable columns 65, without interfering with the normal arrangement of the conveying pipes 7, can reliably support the upper crossbeam 63 and the lower crossbeam 64, effectively improving the overall rigidity and structural stability of the mounting frame 6, preventing deformation of the mounting frame 6 during use, and ensuring the stable and reliable relative positions of the electrical components inside the housing 1. The mating holes 653 are used to fix the electrical components. The number and installation position of the movable columns 65 can be flexibly adjusted according to the size of the housing 1, the number, specifications, and layout of the electrical components, facilitating the subsequent installation, fixing, and wiring of various electrical components, significantly improving the adaptability and assembly versatility of the device.

[0044] Furthermore, a fixing seat 654 is provided on the surface of the movable column 65 facing the inner wall of the housing 1, and a fixing groove 655 of equal size to a semicircle is provided on the surface of the fixing seat 654 facing the top plate 15. The outer wall of the delivery pipe 7 abuts against the groove wall of the fixing groove 655. The structure of the movable column 65 is particularly suitable for housings 1 with larger dimensions. While facilitating the installation and fixing of electrical components, the movable column 65, through the fixing seat 654, provides reliable support and limitation for the delivery pipe 7, effectively preventing problems such as collapse and deformation of the delivery pipe 7 during long-term use, ensuring stable and smooth delivery of the extinguishing agent within the pipe, and guaranteeing the operational reliability and response stability of the fire extinguishing system.

[0045] Mounting hole 1 611 is a circular hole with the same outer diameter as the conveying pipe 7, and mounting hole 2 612 is an elongated hole. Mounting hole 2 612 has a semi-circular mounting groove 6121 on its wall away from the top plate 15. The distance between the wall of mounting hole 2 612 near the top plate 15 and the wall away from the top plate 15 is greater than twice the outer diameter of the conveying pipe 7. The differentiated hole design of mounting hole 1 611 and mounting hole 2 612 facilitates the assembly and positioning of the conveying pipe 7. The conveying pipe 7 can be pre-assembled with the mounting bracket 6 and then assembled into the housing 1, significantly improving assembly efficiency and structural stability.

[0046] The outer wall of the delivery pipe 7 is provided with multiple sleeves 8. The sleeves 8 and the delivery pipe 7 are constrained by a threaded structure—the inner wall of the sleeve 8 has an internal thread 81, the outer wall of the delivery pipe 7 has a segmented external thread 72, and both sides of the vent 71 have external threads 72. The length of the sleeve 8 along the extension direction of the delivery pipe 7 is greater than the width of the vent 71 along that direction and less than the distance between two adjacent vents 71, while being greater than the distance between the two segments of external threads 72 on both sides of the corresponding vent 71. The position of the sleeve 8 along the extension direction of the delivery pipe 7 can be adjusted by rotating the sleeve 8; by moving the sleeve 8, the vent 71 can be covered or opened accordingly, thereby controlling the spray position and spray area of ​​the extinguishing agent.

[0047] Because the layout of electrical components inside the housing 1 varies depending on the actual usage environment at the dock, some vents 71 are easily blocked by electrical components, resulting in poor extinguishing agent ventilation and reduced extinguishing effect. This embodiment addresses this by flexibly adjusting the position of the sleeve 8 to avoid blocked vents 71 and open unobstructed vents 71, allowing the extinguishing agent to diffuse more evenly and efficiently to key areas within the housing, significantly improving the early response speed and extinguishing effect. The overall structure is simple, easy to assemble and operate. The internal thread 81 and external thread 72 allow for rapid adjustment and reliable positioning of the sleeve 8 along the extension direction of the delivery pipe 7, ensuring stable and reliable operation.

[0048] To ensure the stable installation of the gas fire extinguisher 3, two symmetrically arranged fixed ends 193 are fixed to the inner wall of the mounting cavity 19. The ends of the two fixed ends 193 away from the mounting cavity 19 are connected by hooks 194. The two fixed ends 193 and hooks 194 surround the gas fire extinguisher 3. When the gas fire extinguisher 3 sprays the extinguishing agent, it will generate a certain recoil force. The symmetrically arranged fixed ends 193 constrain the gas fire extinguisher 3 circumferentially, which can effectively prevent it from tilting or shifting during the spraying process, ensuring the stability of the extinguishing agent spray direction and the smoothness of the spray path, and avoiding the impact of the gas fire extinguisher 3's deviation on the fire extinguishing effect. At the same time, the hooks 194 can be quickly opened, closed and locked, which facilitates the installation, inspection and replacement of the gas fire extinguisher 3 by the staff, improving the convenience and operability of equipment maintenance. In addition, a cylindrical groove 195 is provided on the surface of the mounting cavity 19 away from the top plate 15, and the groove 195 is arranged opposite to the fixed ends 193. The cylindrical groove 195 can cooperate with the fixed end 193 to form multi-point positioning and constraint for the gas fire extinguisher 3, further improving the installation stability of the gas fire extinguisher 3 and enhancing the overall working reliability of the fire extinguishing device.

[0049] A safety door 9 is provided at the opening 191 of the installation chamber 19. The safety door 9 has a handle 91 and an observation window 92 enclosed by a transparent panel. The safety door 9 can effectively protect the gas fire extinguisher 3 and related components inside the installation chamber 19, preventing external impacts, dust or moisture from entering and affecting the normal operation of the device. The transparent observation window 92 allows the staff to directly view the pressure gauge of the gas fire extinguisher 3 without opening the safety door 9, quickly confirming whether the pressure of the gas fire extinguisher 3 is normal, greatly improving the convenience and efficiency of daily equipment inspection.

[0050] The control unit 4 includes a power supply, a temperature sensor, a communication module, and a main control module. The temperature sensor is installed on the inner wall of the enclosure 1 and electrically connected to the main control module. The power supply includes a battery and an external power source, which simultaneously supplies power to the solenoid valve 31, the temperature sensor, the communication module, and the main control module. The main control module is electrically connected to the temperature sensor, the communication module, and the solenoid valve 31. The main control module has pre-stored normal operating temperature threshold, temperature rise rate threshold, and predetermined monitoring time. In this embodiment, multiple temperature sensors are provided. In addition to being installed at the connection between the mounting cavity 19 and the inner wall of the enclosure 1, they are also installed in key areas prone to electrical faults and heat accumulation, according to the actual layout of electrical components. The wires of the temperature sensors installed in key areas inside the enclosure 1 pass through the mounting cavity 19 and run through the interior of the upper crossbeam 63 or the lower crossbeam 64. This not only achieves concealed wiring and avoids damage from exposed wires, ensuring the normal operation of the temperature sensors, but also effectively improves the utilization rate of the internal space of the enclosure and the overall neatness.

[0051] During normal operation of the junction box, the control component 4 is powered by an external power supply, which is shared with other electrical components inside the box 1 to achieve integrated power utilization. The temperature sensor on the inner wall of the box 1 continuously collects temperature data. Regardless of whether the junction box is in a normal power supply state or a fault power failure state, the temperature monitoring work is not interrupted. The main control module always maintains real-time data transmission to ensure timely capture of abnormal temperatures inside the box.

[0052] The complete process from the occurrence of a fault in the junction box to the completion of fault handling in this embodiment is shown below: Step 1: When the junction box experiences localized heating and rapid temperature rise due to electrical faults such as internal short circuits, overloads, or poor contact at the wiring terminals, the main control module receives real-time temperature data from the temperature sensor and automatically calculates the temperature change slope according to the preset monitoring time. It compares the actual temperature rise rate with a pre-stored temperature rise rate threshold (e.g., a temperature rise ≥ 20°C within 1 minute) to determine if there is a fire hazard. If an electrical fault causes a power supply abnormality during this period, the power supply automatically switches from external power to battery power. The battery can be a disposable battery (replaced periodically by staff) or a rechargeable battery (charged by external power during normal operation of the junction box) to ensure continuous operation of control component 4. Step 2: If the actual temperature rise rate is less than the pre-stored temperature rise rate threshold, it indicates that there is only a slight temperature abnormality inside the box and there is no fire risk. The main control module maintains a low-power standby state and continuously monitors temperature changes. If the actual temperature rise rate is greater than or equal to the pre-stored temperature rise rate threshold, it indicates that there are initial signs of fire inside the box. The main control module immediately sends a continuous electrical signal to the solenoid valve 31 to ensure that the solenoid valve 31 is stably opened and to avoid the solenoid valve 31 failing midway due to signal interruption, which would affect the fire extinguishing effect. Step 3: After the solenoid valve 31 is fully opened, the gas fire extinguisher 3 uses its own stored pressure to spray the extinguishing agent from the nozzle 32 and quickly deliver it through the delivery pipe 7. It is then sprayed into the box 1 through the gas outlet 71. The extinguishing agent can quickly cover all areas inside the box 1, effectively isolate oxygen, inhibit combustion reaction, and achieve rapid fire suppression and extinguishing in the early stage of fire (no open flame or small flame stage), effectively curbing the spread of fire and preventing the fire from damaging electrical components inside the box and equipment around the dock. Step 4: After the fire is extinguished, the temperature inside the junction box gradually drops. The temperature sensor continuously monitors the temperature change. When it is confirmed that the temperature inside the box has dropped to the preset normal operating temperature and the temperature rise rate has returned to 0, the main control module stops outputting trigger electrical signals to the solenoid valve 31 and sends a fire extinguishing completion notification to the dock staff through the communication module. The preset normal operating temperature threshold is determined by the manufacturer after the device is delivered to the site and installed, taking into account factors such as actual on-site test data and the temperature change patterns of the installation site over the years, to ensure the accuracy of temperature judgment. Step 5: After the solenoid valve 31 loses the electrical signal from the main control module, it automatically resets to the normally closed state through its own reset mechanism, cutting off the extinguishing agent discharge circuit, so that the gas fire extinguisher 3 stops delivering extinguishing agent, avoiding excessive consumption of extinguishing agent, and facilitating subsequent equipment maintenance and extinguishing agent replenishment. Step Six: After receiving the notification and arriving at the scene, the staff will first conduct a comprehensive investigation into the cause of the fire in the junction box, complete the fault repair work, and completely eliminate the risk of secondary fire. Then, they will check the remaining amount of extinguishing agent in the gas fire extinguisher 3, the integrity of the external power supply wiring, the closed status of the solenoid valve 31, the sealing of the delivery pipe 7, and the reliability of the temperature sensor to ensure that all the performance of the device is restored to normal. Step 7: After completing all maintenance and reset operations, the staff manually switches the power supply to the external power supply. The main control module re-enters the low-power standby state, and the temperature sensor continues to collect temperature data inside the box, restoring normal monitoring and ensuring all-time protection of the junction box.

[0053] Compared with the prior art, this embodiment has the following advantages: 1. It enables the initial prevention and rapid response to junction box fires, and can promptly trigger the fire extinguishing process in the early stages of a fire, effectively preventing the disaster from escalating and ensuring the safety of electrical equipment and personnel at the dock. 2. The dual power supply mode is adopted to ensure that the main control module, temperature sensor and solenoid valve 31 can still work normally at all times when the junction box is powered off. This solves the shortcomings of traditional junction boxes that cannot monitor fire hazards or automatically extinguish fires after power failure, and improves the stability and reliability of fire prevention and control. 3. Using the "temperature rise rate within a predetermined time" as the fire extinguishing trigger condition, instead of the traditional constant temperature triggering method, it can effectively avoid false triggering caused by non-fire factors such as high ambient temperature and short-term overload, and accurately capture the rapid temperature rise process after the junction box catches fire, so as to achieve timely response and handling in the early stage of fire. 4. The mounting frame 6 integrates long columns 61, short columns 62, upper crossbeam 63, lower crossbeam 64 and movable columns 65, which can provide stable support for the horizontal box 1. The mounting holes 611, 612 and 613 on it can also be used to fix the conveying pipe 7 and various electrical components. It has high integration, strong practicality and flexible adaptability. 5. The independently designed installation chamber 19 can prevent the gas fire extinguisher 3 from being affected by the initial flames of a fire, ensuring the normal use of the gas fire extinguisher 3. The position of the chamber opening 191 facilitates the installation and maintenance of the gas fire extinguisher 3 and the control components 4, allowing staff to check the status of the gas fire extinguisher 3 without opening the box door 2, and facilitating timely replacement when it fails. 6. It adopts a horizontal structure with a low center of gravity and strong stability, which is suitable for the vibration environment of the dock. It has a moderate height and reasonable footprint, which not only facilitates the hoisting and transfer of cargo at the dock, but also reduces the workload of operators in installation and maintenance, improves the safety and convenience of operation, optimizes the utilization of internal space, and enhances the adaptability to harsh environments.

[0054] It should be noted that the types, quantities, and arrangement of electrical components in the junction box can be flexibly configured according to the actual situation of low-voltage power supply requirements and installation space at the dock site. The delivery pipe 7 can be assembled from multiple straight and bent pipes. The delivery pipe 7 is connected to the connecting pipe 5 via a tee, and the pipes are connected to each other via quick connectors. The specific connection method is based on existing conventional technology. This embodiment does not involve any improvement to the pipe connection structure; installers can connect them using conventional methods. Therefore, this embodiment does not elaborate on how the pipes are connected. The attached drawings only illustrate the specific routing of each pipe. Installers can complete the assembly according to the conventional pipe connection methods shown in the attached drawings.

[0055] This invention is not limited to the specific embodiments described above. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any simple changes or modifications made to the design structure and concept of this invention fall within the protection scope of this invention.

Claims

1. A low-voltage junction box for a dock, comprising a box body and a door, wherein the box body is formed by a front panel, a rear panel, a first side panel, a second side panel, a top panel, and a bottom panel, wherein the front panel and the rear panel are arranged opposite to each other, the first side panel and the second side panel are arranged opposite to each other, and the top panel and the bottom panel are arranged opposite to each other, characterized in that: Side mounting holes are provided on both side plate one and side plate two. A front mounting hole is provided on the front plate. A box opening is provided on the top plate. A box door is located at the box opening and is rotatably connected to the box opening. The box door is fixed to the front plate by a latch. Two adjacent sides of the bottom plate are a long side and a short side, respectively. The length of the long side is greater than or equal to the length of the short side. The vertical distance from the top plate to the bottom plate is less than the length of the long side. An integrally formed mounting cavity is provided at the connection between the front plate and side plate one. The mounting cavity includes a cavity opening and a connecting hole located on the adjacent side wall. The cavity opening is located on the front plate and / or side plate one. A gas fire extinguisher and control components are provided within the mounting cavity. The gas fire extinguisher includes a solenoid valve and a nozzle. The solenoid valve is a normally closed solenoid valve. A mounting frame and a delivery pipe are provided inside the box. A connecting pipe connecting the delivery pipe and the nozzle is located in the connecting hole. The mounting frame includes three long columns and one short column. Both the long and short columns are square tubular. The three long columns are respectively provided with… The short columns are located at the connections of side plate one and the rear plate, side plate two and the rear plate, and side plate two and the front plate. The short columns are positioned at the connection of side plate one and the front plate, with one end facing the mounting cavity abutting against the outer wall of the mounting cavity facing the top plate. The long columns have mounting holes and multiple fixing holes. The conveying pipe is annular in shape and passes through the mounting holes of the three long columns sequentially, surrounding the outer wall of the mounting cavity. The side wall of the conveying pipe has multiple air vents evenly arranged along its extension direction. The control components include a power supply, a temperature sensor, a communication module, and a main control module. The temperature sensor is located on the inner wall of the housing and electrically connected to the main control module. The power supply includes a battery and an external power source, simultaneously supplying power to the solenoid valve, temperature sensor, communication module, and main control module. The main control module is electrically connected to the temperature sensor, communication module, and solenoid valve, respectively. The main control module pre-stores a normal operating temperature threshold, a temperature rise rate threshold, and a predetermined monitoring time.

2. The low-voltage junction box for a dock according to claim 1, characterized in that: The mounting holes include mounting hole one and mounting hole two, which are provided on the adjacent side walls of the long column. The conveying pipe passes through both mounting hole one and mounting hole two. Mounting hole one is a circular hole with the same outer diameter as the conveying pipe. Mounting hole two is an elongated hole. Mounting hole two has a mounting groove smaller than or equal to a semicircle on the hole wall away from the top plate. The distance between the hole wall of mounting hole two near the top plate and the hole wall away from the top plate is greater than twice the outer diameter of the conveying pipe.

3. A low-voltage junction box for a dock according to claim 2, characterized in that: The outer wall of the conveying pipe is provided with multiple sleeves. A limiting structure is provided between the sleeves and the conveying pipe to restrict the movement of the sleeves along the axial direction of the conveying pipe. The length of the sleeves along the extension direction of the conveying pipe is greater than the width of the air outlet along the extension direction of the conveying pipe, and less than the distance between two adjacent air outlets.

4. A low-voltage junction box for a dock according to claim 3, characterized in that: The limiting structure consists of an internal thread on the inner wall of the sleeve and an external thread on the outer wall of the conveying pipe that can mate with the internal thread. The external thread is segmented along the extension direction of the conveying pipe, and external threads are provided on both sides of the air outlet. The length of the sleeve along the extension direction of the conveying pipe is greater than the distance between the two external threads on both sides of the corresponding air outlet.

5. A low-voltage junction box for a dock according to claim 4, characterized in that: The mounting frame also includes an upper crossbeam and a lower crossbeam, both of which are square tubular. The upper crossbeam is arranged around the edge of the box opening and its ends are connected to form a ring. The upper crossbeam is fixedly connected to the ends of three long columns away from the bottom plate and the end of one short column away from the bottom plate. The upper crossbeam has multiple upper connecting holes along its extension direction. The lower crossbeam extends along the edge of the bottom plate, and its two ends abut against the two outer walls adjacent to the mounting cavity. The lower crossbeam is fixedly connected to the ends of the three long columns away from the top plate. The lower crossbeam has lower connecting holes corresponding to the upper connecting holes.

6. A low-voltage junction box for a dock according to claim 5, characterized in that: The mounting frame also includes a movable column, which has an upper connecting end, a lower connecting end, and a mating hole. The movable column is fixed to the upper crossbeam by upper bolts passing through the upper connecting end and the upper connecting hole, and the movable column is fixed to the lower crossbeam by lower bolts passing through the lower connecting end and the lower connecting hole. At least one of the movable columns is positioned opposite the front plate. When the movable column is fixed to both the upper and lower crossbeams, the distance between the movable column and the inner wall of the box opposite to it is greater than the outer diameter of the conveying pipe.

7. A low-voltage junction box for a dock according to claim 6, characterized in that: The movable column has a fixed seat on the surface facing the inner wall of the box, and the fixed seat has a fixed groove smaller than or equal to a semicircle on the surface facing the top plate. The outer wall of the conveying pipe abuts against the groove wall of the fixed groove.

8. A dock low-voltage junction box according to claim 5, 6, or 7, characterized in that: Two symmetrically arranged fixing ends are fixed on the inner wall of the mounting cavity. The ends of the two fixing ends away from the mounting cavity are connected by hooks. The two fixing ends and the hooks surround the periphery of the gas fire extinguisher.

9. A low-voltage junction box for a dock according to claim 8, characterized in that: The mounting cavity has a cylindrical groove on the surface away from the top plate, and the groove is positioned opposite to the fixed end.

10. A low-voltage junction box for a dock according to claim 9, characterized in that: The installation cavity is equipped with a safety door at its opening, and the safety door has a handle and an observation window enclosed by a transparent panel.

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