A BTM antenna unit for EMUs that is resistant to harsh environments

Abstract

The present invention provides a BTM antenna unit for EMUs that is resistant to harsh environments, and solves the problems of poor reliability, easy damage and short life of the BTM antenna of the existing EMUs under harsh working conditions. The technical solution is: it includes an internal circuit board assembly of the BTM antenna, an outer shell, a waterproof socket and a wire protection box, the outer shell is composed of an upper shell made of corrosion-resistant metal and a lower shell made of glass fiber reinforced plastic that are mutually buckled, the upper shell and the lower shell are connected and fixed by main bolts near the end corners, the butt joint surfaces of the upper shell and the side walls of the lower shell are provided with mutually matching plug-in interfaces, and are bonded by sealant; a polyester foam sealant layer is filled between the outer shell and the circuit board assembly, the outer surface of the lower shell is a smooth surface, and the wire protection box is a glass fiber reinforced plastic wire protection box. It has good functions of preventing loosening, waterproofing, corrosion, preventing ice accumulation in winter, and impact resistance.

Description

Technical Field

[0001] The invention relates to train signal transmission equipment, in particular to a BTM antenna unit for EMUs that resists harsh environments and is suitable for being arranged at the bottom of high-speed railway trains to transmit signals. Background Art

[0002] At present, China's high-speed railway is developing rapidly, and the technology of high-speed trains is constantly improving. Among them, the BTM antenna unit is a signal transmission device installed at the bottom of the EMU, and is one of the key equipment on the vehicle. Most of the BTM antenna units for EMUs are domestically produced using imported technology from abroad, and their product structure cannot fully adapt to the actual use conditions of China's high-speed railways. Since the BTM antenna unit equipment is installed at the bottom of the EMU, the operating environment is harsh. Problems such as ice accumulation at the bottom of the product in winter, loose equipment, easy corrosion, and poor product sealing often occur, affecting the normal operation of the equipment and causing great trouble to railway bureau users. The occurrence of these problems has brought a lot of maintenance work to users, wasted a lot of manpower and material resources, and brought potential risks to the safe operation of the railway. The market urgently needs a domestic product that can overcome the above shortcomings and completely replace foreign technology. Summary of the invention

[0003] The purpose of the present invention is to provide a BTM antenna unit for EMUs that is resistant to harsh environments, which solves the problems of poor reliability, easy damage and short life of the BTM antenna of existing EMUs under harsh working conditions. The unit has good anti-loosening, waterproof, anti-corrosion, anti-ice accumulation in winter and impact resistance functions.

[0004] The technical solution adopted by the present invention is: the BTM antenna unit for EMUs that is resistant to harsh environments includes a BTM antenna internal circuit board assembly, an outer shell, a waterproof socket and a wire protection box. The technical key points are: the outer shell is composed of an upper shell made of corrosion-resistant metal material and a fiberglass lower shell that are interlocked with each other, the upper shell and the lower shell are connected and fixed by main bolts near the end corners, the butt joint surfaces of the upper shell and the side walls of the lower shell are provided with mutually matching plug interfaces, and are bonded by sealant; a polyester foam sealing layer is filled between the outer shell and the circuit board assembly, the outer surface of the lower shell is a smooth surface, and the wire protection box is a fiberglass wire protection box.

[0005] The side wall of the upper shell is provided with a trapezoidal plugging plate, and the lower shell is provided with a trapezoidal socket that cooperates with the trapezoidal plugging plate.

[0006] The plug-in end face of the trapezoidal plug-in board is provided with a groove or a convex ridge, and the end face of the trapezoidal socket is provided with a convex ridge or a groove that cooperates with the plug-in end face of the trapezoidal plug-in board.

[0007] The outer shell is a rectangular outer shell, and the main bolts are close to the four corners.

[0008] The lower shell body is provided with a reserved opening for glue injection.

[0009] The bolt is coated with thread glue.

[0010] The corrosion-resistant metal is cast aluminum or stainless steel.

[0011] The upper shell is made of cast aluminum.

[0012] The advantages and positive effects of the present invention are as follows: since the present invention is an exposed accessory, its upper and lower shells are respectively made of corrosion-resistant metal or stainless steel, and the wire protection box is a fiberglass wire protection box, which eliminates the potential safety hazards caused by equipment corrosion; the upper and lower shells are connected by socket-type buckles, and the top corners are fastened with bolts, which plays a role in preventing the shell connection from loosening due to its own vibration when the high-speed train is running; by sealing the upper and lower shell sockets with sealant, the connection between the parts that do not need to be disassembled is sealed, which plays a role in the full sealing of the whole machine equipment, improves the sealing effect, and avoids the problem of similar equipment being poorly sealed and electronic components being damp and causing equipment failure; a polyester foam sealing layer is filled between the shell and the circuit board assembly, which eliminates the potential safety hazards of electronic components loosening due to vibration and impact environment; the outer surface of the lower shell adopts a smooth surface, and the adhesion of foreign matter is very low, which reduces the accumulation of ice at the bottom of the equipment in winter and avoids the problem of affecting the signal transmission of the equipment. Therefore, it has the advantages of good anti-loosening, waterproof, anti-corrosion, anti-ice accumulation in winter, and impact resistance, effectively improves reliability, is not easy to damage, reduces the workload of equipment maintenance, and increases service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 yes Figure 1 Schematic diagram of the decomposed state structure;

[0016] Figure 3 It is a schematic diagram of the enlarged structure of the A part of the present invention;

[0017] Figure 4 It is a schematic diagram of the enlarged structure of part B of the present invention.

[0018] Explanation of the serial numbers in the figure: 1 upper shell, 2 lower shell, 3 sealing layer, 4 wire protection box, 5 BTM antenna internal circuit board assembly, 6 reserved opening for glue pouring, 7 glue plug, 8 trapezoidal plug board, 9 waterproof socket, 10 trapezoidal socket, 11 main bolt, 12 groove, 13 convex ridge. DETAILED DESCRIPTION

[0019] according to Figures 1 to 4The specific structure of the present invention is described in detail, and the implementation example Figure 1 and Figure 2 As shown, a BTM antenna unit for EMUs that is resistant to harsh environments, Figure 1 and Figure 2 All of them are inverted state diagrams of the BTM antenna unit resistant to harsh environments for the EMU, including the BTM antenna internal circuit board assembly 5, the outer shell, the waterproof socket 9 and the wire protection box 4, wherein the outer shell is composed of an upper shell 1 and a lower shell 2 that are interlocked with each other. The material of the upper shell 1 can be selected from corrosion-resistant metal, which is cast aluminum or stainless steel. The material of the lower shell 2 is selected from fiberglass. The upper shell where the equipment hoisting hole is located is preferably cast aluminum to meet the equipment hoisting strength. The lower shell and the wire protection box 4 on the equipment magnetic circuit transmission path are made of non-metallic SMC fiberglass to eliminate the interference of the metal area on the magnetic circuit transmission and ensure the normal operation of the equipment. The upper shell is preferably made of cast aluminum or stainless steel, which is easy to assemble accessories. The lower shell is preferably made of fiberglass, which is easy to process the outer surface into a high-gloss smooth surface, effectively preventing the adhesion of dirt, especially preventing the adhesion of ice and snow in winter. The upper shell and the lower shell are fixedly connected by main bolts 11 near the end corners. The bolts can be coated with thread glue to increase the sealing, and can also be fixed by adding multiple auxiliary screws. The butt joints between the upper shell and the side wall of the lower shell are provided with mutually matching plug-in interfaces, and the plug-in interfaces are sealed by sealant to effectively form a closed shell. Figure 1 As shown, a polyester foam sealing layer is filled between the outer shell and the circuit board assembly. Figure 2 As shown (polyester foam sealant layer is not shown), the lower shell 2 is provided with a glue injection reserved port 6 with a glue plug 7, and the polyester foam can be injected through the glue injection reserved port to prevent vibration, achieve sealing and impact resistance. The side edge of the internal circuit board assembly 5 is connected to the waterproof socket 9, and an external cable fixing card is provided near the rear of the waterproof socket. A wire protection box 4 is provided outside the waterproof socket to effectively protect the waterproof socket. The fiberglass wire protection box that needs to be disassembled on site is fastened with screws that have been treated with anti-loosening screws. A shielding aluminum plate can also be provided between the internal circuit board assembly of the BTM antenna and the upper shell.

[0020] As a further improvement, the outer shell is a rectangular outer shell, and the bolts are close to the four corners to facilitate installation and fixation.

[0021] As a further improvement, the side wall of the upper shell has a trapezoidal plug plate 8, and the lower shell has a trapezoidal socket 9 that cooperates with the trapezoidal plug plate, which is convenient for alignment installation. It is also possible to form a groove 12 or a ridge 13 on the plug-in end face of the trapezoidal plug plate, and form a ridge 13 or a groove 12 on the trapezoidal socket that cooperates with the trapezoidal plug plate, so that it can be tightly plugged, such as Figure 3 and 4 As shown, the plug-in end face of the trapezoidal plug board has a groove 12, and the trapezoidal plug opening has a convex ridge 13, which is convenient for sealed docking and tight plugging.

[0022] Installation process and principle: The upper and lower shells are fixed by 4 main bolts and 8 auxiliary screws with thread glue. After fixing, sealant is applied to the groove of the upper shell. The upper and lower shells are designed with ridges and grooves at the joints, and sealant is applied inside. The FRP wire protection box that needs to be disassembled on site is fastened with screws that have been treated with anti-loosening screws. The fasteners can be reused many times without affecting the anti-loosening effect. This design ensures the external anti-loosening and waterproof requirements of the equipment. After the upper and lower shells are assembled and the electrical performance of the equipment is qualified, the polyester foam glue is poured inside the whole machine through the glue filling port reserved in the FRP lower shell to form a sealing layer, thus realizing the double sealing of the inside and outside of the equipment. The internal circuit board assembly is placed in the foam glue, and the impact and vibration of the motor vehicle will not have any effect on sensitive electronic components. The FRP lower shell is made of mold, with high surface finish treatment, and the adhesion of foreign matter is very low. The ice formed by washing vehicles and condensation of water vapor in the northern region will fall off quickly due to gravity, which maximizes the solution to the problem of ice accumulation at the bottom of the product in winter, affecting the signal transmission of the equipment.

[0023] In summary, the purpose of the present invention is achieved.

Claims

1. A BTM antenna unit for EMUs that is resistant to harsh environments, comprising a BTM antenna internal circuit board assembly, an outer shell, a waterproof socket and a wire protection box, characterized in that: The outer shell is composed of an upper shell made of corrosion-resistant metal and a lower shell made of fiberglass, which are fastened to each other. The upper shell and the lower shell are connected and fixed by main bolts near the end corners. The docking surfaces of the upper shell and the side walls of the lower shell are provided with mutually matching plug-in interfaces, and are bonded by sealant; a polyester foam sealing layer is filled between the outer shell and the circuit board assembly, the outer surface of the lower shell is a smooth surface, and the wire protection box is a fiberglass wire protection box; the side wall of the upper shell has a trapezoidal plug plate, and the lower shell has a trapezoidal socket that cooperates with the trapezoidal plug plate; the plug-in end face of the trapezoidal plug plate has a groove or a convex ridge, and the end face of the trapezoidal socket has a convex ridge or a groove that cooperates with the plug-in end face of the trapezoidal plug plate.

2. The BTM antenna unit for EMUs against harsh environments according to claim 1 is characterized in that: The outer shell is a rectangular outer shell, and the bolts are close to the four corners.

3. The BTM antenna unit for EMUs against harsh environments according to claim 1 is characterized in that: The lower shell body is provided with a reserved opening for glue injection.

4. The BTM antenna unit for EMUs against harsh environments according to claim 1 is characterized in that: The main bolt is coated with thread glue.

5. The BTM antenna unit for EMUs against harsh environments according to claim 1 is characterized in that: The corrosion-resistant metal is cast aluminum or stainless steel.

6. The BTM antenna unit for EMUs against harsh environments according to claim 5 is characterized in that: The upper shell is made of cast aluminum.

7. The BTM antenna unit for EMUs against harsh environments according to claim 1 is characterized in that: The outer shell is a rectangular outer shell, and the bolts are close to the four corners; the lower shell has a reserved opening for glue injection; the bolts are connecting fasteners that are thread-resistant or coated with thread glue; the upper shell is a cast aluminum upper shell.

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