Rail transit line section UB box

Abstract

The utility model relates to a rail transit line section UB box, which comprises a box body, a box door and a base, the thickness of a steel plate of the box body is not less than 2mm, and reinforcing ribs are at least arranged at the right-angle break angle of the box body; the box door is installed on one side of the box body through a hinge, the axial direction of the hinge is the vertical direction, and meanwhile the box door is locked on the box body through eight stainless steel M8 inner hexagonal locking bolts which are evenly distributed on the periphery of the box door. The thickness of the base steel plate is not smaller than 2.5 mm. The base and the box body are welded into a whole in a full-length welding mode. And the mounting plate in the box body is mounted by adopting a standby mother process, namely, a screw is fixed on the back surface of the mounting plate by adopting a nut, and each device in the box body is provided with a damping rubber mat. According to the utility model, based on the problems of the existing UB box, the structural design, the installation mode, the device type selection and the electrical protection design of the box body are optimized, so that the novel UB box can adapt to the severe working environment in the trackside section of the rail traffic line, the service life is greatly prolonged, the operation safety of the rail vehicle is ensured, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to rail transit line auxiliary equipment technical field, concretely relates to a rail transit line section UB box. BACKGROUND

[0002] With the need and development of modern management, the closed circuit television monitoring system is an important means for city rail transit maintenance and guaranteeing transportation safety, which can provide visual information about train operation, disaster prevention and rescue, passenger diversion and social security.

[0003] A certain subway line in Beijing is the first self-developed fully automatic subway line in China. There are 79 closed circuit television monitoring system integrated control boxes in the whole line section, which mainly function to collect video images of section cameras, transmit them to the equipment room by optical fiber, restore the video images through video coding and decoding technology, guarantee the safety of line operation, and serve the operation company and the public security department.

[0004] The section camera of the line is installed on a trackside mounting bracket, and a UB box is arranged below the camera. The UB box is internally provided with power circuit breakers, surge protectors, transformers, DC power supplies, ONUs, optical fiber boxes, optical splitters, combined surge protectors and other power supply and video signal transmission equipment related to the camera, as shown in Figure 15 .

[0005] The existing UB box of the line is made of carbon steel, and a mounting base is welded at the bottom of the case. The surface of the case is sprayed with gray protective paint, and the case is internally provided with a mounting plate for installing electrical equipment. The door of the case is connected to the case body through a hinge, and the hinge is arranged above the case body. The door is locked through a tongue lock.

[0006] Since the section UB box is installed in the section of the trackside of the subway line, it is subjected to wind, sun, rain and snow for a long time, and the running vibration and impact of the subway train, so it has high requirements for its firmness, waterproof performance, corrosion resistance and shock resistance. Since the line was opened, some section integrated control boxes have defects such as poor waterproof performance, poor shock resistance, unreasonable internal component design, high failure rate, boundary intrusion and fire hazards, which endanger the safety of train operation and bring great pressure to the daily subway operation and maintenance work.

[0007] The existing UB box has the following defects:

[0008] I. External problem of integrated control box:

[0009] Serial number Problem description Legend 1 The bottom of the box is painted outside, causing the base to rust seriously. Figure 16-1 2 The sheet metal of the box is cracked. Figure 16-2 3 During the inspection, it was found that some of the fixing screws of the base support of the integrated control box were loose. Figure 16-3 4 Some locks of the box are damaged or missing, causing the door to be unable to open and close. Figure 16-4 5 The hinge of the box is broken, the door is loose, and there is a risk of boundary violation. Figure 16-5

[0010] II. Internal problem of integrated control box:

[0011] Serial number Problem description Legend 1 The internal cable routing of the integrated control box is not standardized. Figure 17-1 2 The screws of the internal fixed equipment are missing or loose, causing the equipment to be damaged. Figure 17-2 3 The positioning hole of the ring transformer is damaged, the ring transformer is loose, causing the cable to be damaged. Figure 17-3 4 The optical fiber interface is loose, causing the optical fiber to be damaged. Figure 17-4 5 The internal modular connection terminal is not fixed, the terminal is inclined, causing the cable to be virtually connected. Figure 17-5

[0012] III. Equipment problems:

[0013] Serial number Problem description Legend 1 The ring transformer has no authentication information, and the quality cannot be guaranteed. Figure 18-1 2 The output side of the transformer has no overload protection. Figure 18-2 3 The internal power module of the ONU has no insulation protection, causing the power module to burn out. Figure 18-3 4 The internal inductance of the combined surge protector is affected by vibration, causing the inductance pin to break. Figure 18-4 5 The power module has design defects, causing the power module to work unstably. Figure 18-5

[0014] Based on the above problems, it is urgent to develop a CCTV system UB box suitable for the track interval of the subway line to meet the actual use requirements. SUMMARY

[0015] In view of the deficiencies of the prior art, the main purpose of the utility model is to provide a rail transit line interval UB box, based on the problems existing in the current UB box, the box structure design, installation method, device selection and electrical protection design are optimized, so that the new UB box can adapt to the harsh working environment of the rail transit line interval.

[0016] The technical scheme of the utility model is as follows: a rail transit line interval UB box, comprising:

[0017] The box body is made of steel plate with a thickness of not less than 2mm, and at least a reinforcing rib is arranged at the right angle corner of the box body;

[0018] The box door is made of steel plate with the same thickness as the box body, and the box door is installed on one side of the box body by a hinge, and the axial direction of the hinge is vertical, and the box door is locked on the box body by eight evenly distributed stainless steel M8 internal hexagonal locking bolts around the box door, wherein one is arranged at each corner of the box door, and one is arranged at the middle of each side of the box door;

[0019] The base is made of steel plate with a thickness of not less than 2.5mm, and the base and the box body are integrally welded by full welding; and

[0020] The mounting plate in the box body is installed by a backup nut process, that is, the nut is used to fix the screw on the back of the mounting plate, and each device in the box body is provided with a damping rubber pad.

[0021] As a specific improvement that can be realized, the surfaces of the box body, the box door and the base are subjected to professional paint spraying in a paint spraying room.

[0022] As a specific improvement that can be realized, each device in the box body is fixed by a combination of stainless steel M6 internal hexagonal screw and self-locking lock nut.

[0023] As a specific improvement that can be realized, the steel plate thickness of the transformer mounting plate in the box body is not less than 2mm, and the plane of the transformer mounting plate is annular, the elevation is few type, the few type mounting plate has foot on both sides, and the width of the foot is 20mm, and four mounting holes are symmetrically distributed at the four corners of the foot.

[0024] As a specific improvement that can be implemented, the combined surge protector in the box adopts a constant SV-2-24V combined surge protector, and the PCB thereof is subjected to potting treatment.

[0025] As a specific improvement that can be implemented, the wiring terminal in the box adopts a straight insertion spring terminal to press the core of the cable by metal elasticity.

[0026] As a specific improvement that can be implemented, the transformer in the box adopts an LTC300 type transformer, and the transformer shell is provided with a protective cover with a UL94-V0 flame retardant level and an IP67 protection level.

[0027] As a specific improvement that can be implemented, the transformer output in the box is provided with a fuse to burn out the corresponding fuse when a short circuit occurs in the power supply of a certain camera, so as to protect the normal power supply of the transformer and the work of other cameras.

[0028] As a specific improvement that can be implemented, the mounting base plate of the UB box is reserved with mounting hole positions of two specifications, which can be compatible with the installation of two types of ONU and auxiliary equipment, so as to adapt to two types of ONU of the video monitoring system.

[0029] As a specific improvement that can be implemented, the UB box has an overall size of 600mm*580mm*200mm, and a weight of not less than 30kg, and an overall bearing capacity of 150KG, so as to be stepped on by maintenance personnel.

[0030] The utility model discloses relative to prior art beneficial effect is: the utility model discloses a rail transit line section UB box, through reasonable modification design, can greatly prolong the service life of UB box, reduce maintenance cost.Specifically, at least one or more of the following beneficial effects can be achieved:

[0031] (1) by optimizing the structure design of the box, reduce the failure rate of the hinge of the box door falling off and damage;

[0032] (2) by optimizing the structure design of the box, reduce the possibility of the box door falling off and abnormally opening;

[0033] (3) by optimizing the processing and rust prevention design of the box, reduce the probability of the box rusting, and prevent the base and the box from cracking;

[0034] (4) by optimizing the anti-vibration and equipment damping design of the UB box, reduce the probability of the screw of the equipment in the UB box falling off and the equipment falling off;

[0035] (5) by optimizing the selection design of the device, prevent the internal components of the combined surge protector from being shaken off;

[0036] (6) through the optimization of the selection of the device design, reduce the UB box cable loose failure rate;

[0037] (7) through the improvement of electrical protection design, put an end to the transformer burnout, a camera internal short circuit, will not cause other camera power failure;

[0038] (8) through the optimization of the new UB box internal equipment layout design, can be compatible with two types of ONU installation and use;

[0039] (9) through the above various targeted improvements, the new UB box of the utility model eliminates the hidden danger of invasion, fire and endangering driving safety, and guarantees the safe operation of rail vehicles.

[0040] It should be understood that the implementation of any embodiment of the utility model does not mean that multiple or all of the above beneficial effects are simultaneously achieved or reached. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be derived from the provided drawings without creative labor.

[0042] The structure, proportion, size, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model.

[0043] Figure 1 It is a three-dimensional structure schematic diagram of the new UB box of the embodiment of the utility model;

[0044] Figure 2 It is a front structure schematic diagram of the new UB box of the embodiment of the utility model;

[0045] Figure 3 It is a schematic diagram of the appearance of the existing UB box;

[0046] Figure 4 It is a schematic diagram of the bottom rust of the existing UB box;

[0047] Figure 5 It is a schematic diagram of the damping structure of the new UB box of the embodiment of the utility model;

[0048] Figure 6 The structure schematic diagram of the novel UB box transformer mounting plate of the embodiment of the present application, wherein (a) is a plan view, (b) is an elevation view, and (c) is an elevation view of the transformer being mounted;

[0049] Figure 7 The structure schematic diagram of the novel UB box of the embodiment of the present application, wherein (a) is an existing combined surge protector, and (b) is the combined surge protector of the novel UB box of the embodiment of the present application;

[0050] Figure 8 The structure schematic diagram of the novel UB box of the embodiment of the present application, wherein (a) is an existing combined surge protector, and (b) is the combined surge protector of the novel UB box of the embodiment of the present application;

[0051] Figure 9 The structure schematic diagram of the novel UB box of the embodiment of the present application, wherein (a) is an existing combined surge protector, and (b) is the combined surge protector of the novel UB box of the embodiment of the present application;

[0052] Figure 10 The single-way short-circuit principle diagram of the UB box camera of the embodiment of the present application;

[0053] Figure 11-1 The equipment layout schematic diagram of the novel UB box large ONU machine case of the embodiment of the present application;

[0054] Figure 11-2 The equipment layout schematic diagram of the novel UB box small ONU machine case of the embodiment of the present application;

[0055] Figure 12 The actual object display diagram of the novel UB box of the embodiment of the present application;

[0056] Figure 13 The on-site installation diagram (closed state) of the novel UB box of the embodiment of the present application;

[0057] Figure 14 The on-site installation diagram (closed state) of the novel UB box of the embodiment of the present application;

[0058] Figure 15 The structure schematic diagram of the UB box structure of an existing certain track line trackside section;

[0059] Figure 16-1 The schematic diagram of the existing UB box external bottom paint peeling leading to the base being seriously rusted;

[0060] Figure 16-2 The schematic diagram of the existing UB box external sheet metal cracking phenomenon;

[0061] Figure 16-3 The schematic diagram of the existing UB box base support fixing screw loosening phenomenon;

[0062] Figure 16-4 Existing UB box body lock damage or loss diagram;

[0063] Figure 16-5 Existing UB box hinge fracture damage diagram;

[0064] Figure 17-1 Existing UB box internal cable wiring is not standardized diagram;

[0065] Figure 17-2 Existing UB box internal fixed equipment screw loss or loose caused by equipment damage diagram;

[0066] Figure 17-3 Existing UB box internal ring transformer positioning hole damage caused by ring transformer loose and cable damage diagram;

[0067] Figure 17-4 Existing UB box internal optical fiber interface loose caused by optical fiber damage diagram;

[0068] Figure 17-5 Existing UB box internal module line terminal without fixed caused by terminal tilt and cable virtual connection diagram;

[0069] Figure 18-1 Existing UB box ring transformer without authentication information diagram;

[0070] Figure 18-2 Existing UB box transformer output side without overload protection diagram;

[0071] Figure 18-3 Existing UB box ONU internal power module without insulation protection caused by power module burning diagram;

[0072] Figure 18-4 Existing UB box combination surge protector internal inductance affected by vibration caused by inductance pipe pin broken diagram;

[0073] Figure 18-5 Existing UB box power module design defects caused by unstable power module working diagram.

[0074] Markings in the figure:

[0075] Box 1, door 2, base 3, hinge 4, locking bolt 5, transformer mounting plate 6, foot 7, mounting hole 8, transformer 9.

[0076] The same or corresponding marks in the figure represent the same or corresponding parts. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings. Herein, the illustrative embodiments of the present application and the description thereof are used to explain the present application, but are not used as a limitation of the present application.

[0078] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0079] It should be understood that the terms "including", "comprising", "consisting of" or any other variants are intended to cover non-exclusive inclusion, so that the product, device, process or method including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes the elements inherent to such product, device, process or method. Without more limitations, the elements defined by the statement "including", "comprising", "consisting of" do not exclude the presence of other identical elements in the product, device, process or method including the elements.

[0080] It should also be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices, components or structures referred to must have a particular orientation, be constructed or operated in a particular orientation, and cannot be understood as a limitation of the present application.

[0081] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0082] In view of the external problems, internal problems and equipment problems of the existing UB box, the utility provides a rail transit line section UB box, which comprises a box body, a box door and a base, and is optimized from aspects of box body structure design, component itself, installation mode, device selection and electrical protection design, so that the new UB box can adapt to the harsh working environment of the rail transit line section.

[0083] Noun explanation: UB box, i.e. rail transit line section equipment comprehensive box, for video monitoring system.

[0084] The implementation of the utility model will be described in detail in combination with the preferred embodiments.

[0085] Reference Figure 1 , 2 , the UB box comprises a box body 1, a box door 2 and a base 3, and specific improvements will be described one by one as follows.

[0086] I. Optimize the box body structure

[0087] (1) The existing UB box has a relatively thin box body plate, which is prone to screw loosening and plate deformation under the long-term vibration of vehicles, especially when the on-site maintenance personnel need to step on the camera for maintenance, which is prone to deformation, distortion and even instability damage.

[0088] The box body 1 of the new UB box is made of 2mm thick steel plate and is additionally provided with a reinforcing rib. By using a relatively thick 2mm steel plate, the new UB box can avoid damage during daily use and stepping, thereby prolonging the service life.

[0089] (2) As shown in Figure 3 , the hinge of the existing UB box is located on the upper side of the case, and since the hinge bears the main weight (about 3.5kg) of the box door, the gravity generates pressure in the radial direction of the hinge. According to the principle of leverage, the stress at the joint of the hinge is amplified, so the joint of the hinge is prone to deformation or even breakage, which makes the box door difficult to open and close or even fall off, causing serious boundary invasion risk.

[0090] The hinge 4 of the new UB box is arranged on one side of the box body, such as the left side or the right side. The stress direction of the hinge is axial, and the axial pressure has a smaller effect on the hinge. In addition, the new UB box uses eight M8 internal hexagonal locking bolts 5 to lock the box door 2 and the box body 1, which makes the hinge basically not stressed, so the hinge will not be damaged or broken. At the same time, the locking bolt 5 is used to lock the box door, which greatly improves the reliability of the box door locking. When the on-site maintenance personnel need to open the box door, they use the wrench carried on their body to unscrew the locking bolt 5.

[0091] The new UB box completely solves the problems of hinge and lock damage and falling off, effectively prevents the abnormal falling and opening of the box door, and eliminates the boundary invasion risk of the box door.

[0092] II. Optimizing the base structure

[0093] The existing UB box body and base are welded by spot welding. Due to imperfect corrosion treatment at the welding site, the welding site is prone to rust in harsh environments (long-term attack of rain, snow and humid weather, strong wind, train vibration impact), and may cause the welding point to crack, and even cause the box body to fall off, as shown in Figure 4

[0094] The new UB box base 3 is made of 2.5 mm steel plate, and the box body and the base are welded together by full welding. The welding strength is better than that of the existing UB box. The 2.5 mm thick steel plate base has greater weight, is more stable after installation, and has higher strength.

[0095] In addition, the new machine case is sprayed in a paint spraying room, and the paint quality is better than that of the existing UB box. There is no phenomenon of welding point not being sprayed. Therefore, the problems of machine case rust and welding point cracking are effectively solved, and the risk of UB box falling off is eliminated.

[0096] III. Optimizing the anti-vibration and equipment damping of the UB box

[0097] The existing UB box has poor damping performance, and most UB boxes have the problems of internal equipment fixing screw falling off and equipment falling off. The main reason is that the screw is not properly selected, and there is a lack of flat and elastic pads. In addition, the installation hole of the equipment is only coned (without spare mother) on the installation plate. The original installation plate is only 1.5 mm, and the thread is only 2-3 turns, so the installation is not firm.

[0098] As shown in Figure 5 , the new UB box is equipped with shock-absorbing rubber pads for equipment installation to alleviate the vibration impact caused by train operation. The spare mother process is used for equipment installation in the UB box, and the nut is used to fix the screw on the back of the installation plate to enhance the firmness of the equipment installation. The fixing screw of the equipment is made of stainless steel hexagonal combination screw and self-locking lock nut to fix each equipment and improve the anti-vibration performance.

[0099] IV. Optimizing the transformer installation plate structure

[0100] The installation hole of the existing UB box transformer installation plate is damaged, which causes the transformer to fall off and cannot be normally installed. The main reason is that the transformer installation plate steel plate is relatively thin, and the installation hole is too close to the edge of the steel plate, which is prone to damage the installation hole after being disassembled and assembled several times.

[0101] As shown in Figure 6 ​As shown, the mounting plate 6 of the new UB box transformer adopts a ring-shaped mounting plate, which is made of 2mm thick steel plate. The ring-shaped mounting plate is shaped like a "Z" on the vertical surface. The "Z"-shaped mounting plate 6 has feet 7 on both sides, each foot 7 being 20mm wide. Four mounting holes 8 are symmetrically distributed at the four corners of the feet 7 on both sides. In use, the transformer 9 is installed on the ring-shaped mounting plate 6, and the feet 7 on both sides are fixed to the box body with four screws. The four mounting holes are reasonably arranged, and the feet 7 have sufficient width so that the mounting holes are not too close to the edge of the steel plate, preventing damage due to repeated disassembly and assembly or vibration.

[0102] V. Optimize Component Selection

[0103] (1) Existing combined surge protectors have poor shock resistance, and frequent occurrences of broken or detached internal inductor pins lead to camera image signal interruption faults, such as... Figure 7 As shown in (a) in the figure.

[0104] The new UB box uses Henglixin SV-2-24V combined surge protector. The circuit board inside this protector is well-manufactured, and the component pins are robust. To further enhance its shock resistance, the PCB is potted, thereby reducing the failure rate of components desoldering and damage caused by vibration, and improving the reliability of equipment operation. Figure 7 As shown in (b) of the diagram.

[0105] (2) The existing UB box wiring terminals are screw-press type. These terminals are not suitable for environments with strong vibrations, are prone to loosening, causing poor power contact, and the terminal blocks may burn out due to overheating, resulting in a power outage for the camera. Figure 8 As shown in (a) in the figure.

[0106] The new UB box uses direct-insertion spring terminals, which rely on the metal spring force to crimp the cable cores, providing good shock resistance. By optimizing the terminal block selection, its shock resistance is improved, reducing the failure rate caused by loose wiring. Figure 8 As shown in (b) of the diagram.

[0107] (3) The existing UB box transformers are of poor quality and lack manufacturer and certification information, such as... Figure 9 As shown in (a) in the figure.

[0108] The new UB box replaces the original toroidal transformer with an LTC300 transformer. The replacement transformer has a protective casing, a flame retardant rating of UL94-V0, an IP67 protection rating, and CE certification, making it relatively reliable. Figure 9 As shown in (b) of the diagram.

[0109] VI. Improve electrical protection

[0110] The existing UB box has occurred transformer burnout failure many times. The analysis of the failure reason is that when the surge protector, camera cable or camera internal short circuit occurs, it will not cause the transformer input current to increase, so the UB box power circuit breaker will not trip, which leads to the transformer overheating and burning out.

[0111] The new UB box installs an insurance at the output of the transformer. Once a camera power supply short circuit occurs, the corresponding insurance will burn out, thereby protecting the normal power supply of the transformer, and the work of other normal cameras is not affected, as shown in Figure 10 .

[0112] Seven, optimize the internal equipment layout

[0113] The new UB box uses two types of ONU in the CCTV system of a subway line in Beijing, and their sizes are different. In order to improve the universality, the installation bottom plate of the new UB box is optimized and designed, one is for large ONU cabinet equipment layout, and one is for small ONU cabinet equipment layout, which can be compatible with the installation of two types of ONU and auxiliary equipment, as shown in Figure 11-1 , 11-2 .

[0114] Eight, main technical parameters of the new UB box

[0115] The main technical parameters of the new UB box provided by the utility model are as follows:

[0116] The size is 600mm*580mm*200mm, and the weight is not less than 30kg;

[0117] The door opening mode is left opening, and the hinge is externally arranged on the left side;

[0118] The door fixing mode is that the door and the cabinet are fixed by eight stainless steel M8 internal hexagonal screws around;

[0119] The protection level is IP65;

[0120] The cabinet bearing capacity is that the whole can bear the gravity of 150KG, which is enough for maintenance personnel to step on, so as to avoid the deformation, indentation and even damage of the traditional cabinet when stepping on.

[0121] The thickness of the cabinet steel plate is 2mm, and the reinforcing rib is additionally arranged, the thickness of the base steel plate is 2.5mm, and the thickness of the installation plate is 2.5mm;

[0122] Five outlet holes are reserved at the bottom, one 36mm and four 25mm, and plastic waterproof joints are arranged.

[0123] The new UB box provided by the utility model can be further referred to Figure 12-14As shown, the UB box in Beijing subway line in the field installation and use state of the case, after long-term use of the field test, confirmed that the new UB box can especially reduce the failure rate of the door, reduce the probability of the box body corrosion, the probability of internal device loose and fall off, and effectively eliminate the hidden danger of invasion, fire, endanger the safety of train operation, and protect the safety of rail vehicle operation.

[0124] The above has described various embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A rail transit line section UB box, characterized in that, include: The enclosure has a steel plate thickness of not less than 2mm and is reinforced at least at the right-angle corners of the enclosure. The door has a steel plate thickness that is the same as the box body. The door is hinged to one side of the box body, and the hinge is axially vertical. The door is secured to the box body with eight evenly distributed stainless steel M8 hexagon socket head cap screws around its perimeter, one at each of the four corners and one at the center of each of the four sides. The base, made of steel plate with a thickness of not less than 2.5mm, is fully welded to the housing as a single unit; and The mounting plate inside the enclosure is installed and fixed using a nut-mounting process, that is, screws are fixed to the back of the mounting plate with nuts. Each piece of equipment inside the enclosure is equipped with shock-absorbing pads.

2. The rail transit line section UB box according to claim 1, characterized in that, The surfaces of the box body, door, and base are all professionally painted in a spray booth.

3. The rail transit line section UB box according to claim 1, characterized in that, All equipment inside the enclosure is secured with a combination of stainless steel M6 hex socket screws and self-locking nuts.

4. The rail transit line section UB box according to claim 1, characterized in that, The steel plate of the transformer mounting plate inside the enclosure is not less than 2mm thick, and the transformer mounting plate is circular in plan and Z-shaped in elevation. The Z-shaped mounting plate has feet on both sides, and the feet are 20mm wide. Four mounting holes are symmetrically distributed in pairs at the four corners of the feet.

5. The rail transit line section UB box according to claim 1, characterized in that, The surge protector inside the enclosure is a Henglixin SV-2-24V surge protector, and its PCB is potted.

6. The rail transit line section UB box according to claim 1, characterized in that, The wiring terminals inside the enclosure are straight-insertion spring terminals, which use the metal spring force to crimp the wire core of the cable.

7. The rail transit line section UB box according to claim 1, characterized in that, The transformer inside the enclosure is an LTC300 type transformer, and the transformer shell is equipped with a protective cover with a flame retardant rating of UL94-V0 and a protection rating of IP67.

8. The rail transit line section UB box according to claim 1, characterized in that, The transformer output inside the enclosure is equipped with a fuse to blow the corresponding fuse when a short circuit occurs in the power supply of a certain camera, thus protecting the transformer from power supply disruption and ensuring that the operation of other cameras is not affected.

9. The rail transit line section UB box according to claim 1, characterized in that, The mounting base plate of the UB box has two sizes of mounting holes, which can be compatible with the installation of two types of ONUs and auxiliary equipment, so as to accommodate two models of ONUs in the video surveillance system.

10. The rail transit line section UB box according to any one of claims 1 to 9, characterized in that, The UB enclosure has external dimensions of 600mm*580mm*200mm, weighs no less than 30kg, and has an overall load-bearing capacity of 150KG, so that maintenance personnel can step on it.

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