ETX-ZS type LED railway signal bulb

Abstract

The utility model discloses a kind of ETX-ZS type LED railway signal bulb, including shell, and LED aluminum base circuit board, alarm circuit board, power input bolt terminal, power transformer, main circuit board are set on shell;LED aluminum base circuit board, alarm circuit board, power input bolt terminal, power transformer are electrically connected with main circuit board;Rectifier circuit, voltage stabilizing circuit, control circuit are integrated in sequence electrically connected on main circuit board, power input bolt terminal is electrically connected with the rectifier circuit of main circuit board by power transformer, the control circuit of main circuit board is electrically connected with LED aluminum base circuit board, main circuit board also includes electrically connected current detection circuit and current compensation circuit, current detection circuit is electrically connected with power input bolt terminal, current detection circuit is electrically connected with control circuit.By using the above setting, can effectively avoid contact bad, rust and other problems, thereby prevent the emergence of black lamp, disorderly alarm and other faults caused thereby.

Description

Technical Field

[0001] This utility model is an LED point light source specifically designed for railway signaling systems, belonging to the technical field of railway signal lights, and specifically relates to an ETX-ZS type LED railway signal bulb. Background Technology

[0002] In existing technology, the outdoor portion of a railway signal light system consists of railway signal bulbs and matching lighting units and a fixed-focus plate base. For example... Figure 1 The image shows the outdoor equipment of a traditional signal system: (1) railway color light signal mechanism, (2) ground XB box, (3) lighting unit, (4) fixed focus plate base, and (5) railway signal bulb. The box supplies AC220V power, depending on the actual site conditions. Figure 2 As shown, the lighting unit is installed inside the box or the color light signal mechanism, while the fixed-focus plate base and the railway signal bulb are installed inside the color light signal mechanism.

[0003] Among them, the connecting wires between (3) the lighting unit and (4) the fixed-focus plate base are often incorrectly connected or mixed up during equipment installation or replacement; under long-term use, the main and auxiliary springs of the fixed-focus plate base will fatigue and lose elasticity, causing poor contact between (5) the railway signal bulb and the main and auxiliary springs of the fixed-focus plate base, resulting in faults such as blackout lights and false alarms. In addition, when working in harsh outdoor environments for a long time, the main and auxiliary springs will rust and increase resistance, which will lead to poor conduction with the bulb, resulting in faults such as blackout lights and false alarms. Therefore, there is still room for improvement. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an ETX-ZS type LED railway signal bulb, which can effectively avoid a series of problems such as poor contact and corrosion, thereby preventing the occurrence of faults such as blackout lights and false alarms.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An ETX-ZS type LED railway signal bulb includes a housing, and an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer, and a main circuit board disposed on the housing. The LED aluminum-based circuit board, the alarm circuit board, the power input bolt terminal, and the power transformer are all electrically connected to the main circuit board. The main circuit board integrates a rectifier circuit, a voltage regulator circuit, and a control circuit that are electrically connected in sequence. The power input bolt terminal is electrically connected to the rectifier circuit of the main circuit board through the power transformer. The control circuit of the main circuit board is electrically connected to the LED aluminum-based circuit board. The main circuit board also includes an electrically connected current detection circuit and a current compensation circuit. The current detection circuit is electrically connected to the power input bolt terminal and the control circuit.

[0007] Furthermore, it also includes a heat sink disposed on the housing, the LED aluminum-based circuit board is attached to the heat sink, the heat sink has a channel, and the channel is directly opposite the LED light of the LED aluminum-based circuit board.

[0008] Furthermore, the housing includes a base and an upper housing disposed on the base. The upper housing has a storage groove on its side, and the alarm circuit is disposed in the storage groove. The heat sink and the LED aluminum-based circuit board cover the opening of the storage groove. The bottom surface of the base has a receiving groove, and the power transformer and the main circuit board are both disposed in the receiving groove. The bottom surface of the storage groove has a through hole, and the top surface of the base has a cable routing hole corresponding to the through hole. The cable routing hole is connected to the receiving groove.

[0009] Furthermore, the alarm circuit is connected to a main / secondary switching test button and a blackout double-off test button. The inner bottom surface of the storage slot has two through holes, which correspond to the main / secondary switching test button and the blackout double-off test button, respectively.

[0010] This utility model has the following beneficial effects:

[0011] This utility model incorporates an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer, and a main circuit board on the housing. The alarm circuit promptly transmits alarm information to the indoor alarm control panel when the main or auxiliary LED light sources malfunction or go black, alerting railway signaling personnel to replace the equipment in a timely manner. The power input bolt terminal connects to a 220V power supply. The input power is converted to a suitable voltage range by a power transformer, and then rectified and regulated by a rectifier circuit and a voltage regulator circuit to power the LEDs on the LED aluminum-based circuit board. Simultaneously, the current detection circuit monitors the external power supply in real time. When the input power is normal, the control circuit controls the constant current and lighting circuit of the LED aluminum-based circuit board, and the main filament LED chip on the circuit board starts working. When the main filament LED chip is damaged, the main filament detection circuit detects an abnormal main filament voltage. At this time, the control circuit switches the constant current and lighting circuit to the auxiliary filament chip on the LED aluminum-based circuit board, and the alarm circuit transmits the fault information back to the indoor system, reminding railway signal personnel to replace the equipment in time. When the auxiliary filament LED chip is damaged, the auxiliary filament detection circuit detects that the auxiliary filament LED chip is de-energized, and the device will be in a blackout state and an alarm will sound. Meanwhile, the current compensation circuit can compensate the power supply current in real time to meet the reliable current requirements of the indoor filament monitoring relay. As can be seen, this utility model integrates the functions of a traditional lighting unit, a railway signal incandescent bulb (equivalent to the LED aluminum-based circuit board of this utility model), and a fixed-focus plate base (equivalent to the housing of this utility model) into one unit, making the overall structure compact. At the same time, it eliminates the snap-fit ​​installation method to prevent the light from going out due to structural aging and loosening. Furthermore, the LED aluminum-based circuit board, alarm circuit board, main circuit board, power input bolt terminals, power transformer, and other components are connected by electrical connection, avoiding a series of problems such as poor contact and corrosion, thereby preventing the occurrence of faults such as blackout lights and false alarms. Attached Figure Description

[0012] Figure 1 This is the outdoor equipment for this traditional signal system.

[0013] Figure 2 This paper compares the installation structure of the outdoor equipment of the traditional signaling system with the installation structure and principle of the ETX-ZS type LED railway signal light bulb.

[0014] Figure 3 This is a schematic diagram of the structure of the ETX-ZS type LED railway signal bulb of this utility model.

[0015] Figure 4 This is an exploded view of the ETX-ZS type LED railway signal bulb of this utility model.

[0016] Figure 5 This is a structural schematic diagram of the ETX-ZS type LED railway signal bulb of this utility model from another perspective.

[0017] Figure 6 This is a schematic diagram illustrating the working principle of the ETX-ZS type LED railway signal bulb of this utility model.

[0018] Figure 7 This is a schematic diagram of the control circuit for the ETX-ZS type LED railway signal bulb of this utility model.

[0019] Figure 8 This is a schematic diagram of the LED aluminum-based circuit board of the ETX-ZS type LED railway signal bulb of this utility model.

[0020] In the picture:

[0021] 1. Base; 11. Receiving slot; 12. Cable routing hole; 13. Step; 131. Power interface;

[0022] 2. Upper shell; 21. Storage slot; 22. Cable guide hole; 23. Through hole;

[0023] 3. Main circuit board; 31. Rectifier circuit; 32. Voltage regulator circuit; 33. Control circuit; 34. Current detection circuit; 35. Current compensation circuit;

[0024] 4. LED aluminum-based circuit board;

[0025] 5. Alarm circuit board; 51. Main / auxiliary switching test button; 52. Double blackout test button;

[0026] 6. Power input bolt terminal;

[0027] 7. Power transformer;

[0028] 8. Heatsink; 81. Channel;

[0029] 9. Terminal protective housing; 91. Clearance groove;

[0030] 10. Base bracket; 101. Groove; 102. Reinforcing plate; 103. Insert; 104. Container box. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Terms such as “upper,” “inner,” “middle,” “left,” “right,” and “one” used in this specification are merely for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0032] This invention addresses the common problems of corrosion and increased resistance in traditional outdoor signaling systems operating in harsh environments for extended periods. These corrosions can lead to poor conductivity with the bulb, resulting in blackouts and false alarms. The ETX-ZS LED railway signal bulb integrates the functions of a lighting unit, a fixed-focus base 1, and a railway signal incandescent bulb into a single unit. It eliminates the need for wiring connections and clip-on installation methods, preventing these issues. Furthermore, its internal components, including the LED aluminum-based circuit board 4, alarm circuit board 5, main circuit board 3, power input bolt terminal 6, and power transformer 7, are electrically connected, avoiding problems such as poor contact and corrosion, thus preventing blackouts and false alarms.

[0033] Based on this, the structure and principle of the ETX-ZS type LED railway signal bulb of this utility model will be described in detail below:

[0034] An ETX-ZS type LED railway signal bulb, such as Figures 3 to 8 As shown, the device includes a housing, and an LED aluminum-based circuit board 4, an alarm circuit board 5, a power input bolt terminal 6, a power transformer 7, a main circuit board 3, and a heat sink 8, all mounted on the housing. The LED aluminum-based circuit board 4, the alarm circuit board 5, the power input bolt terminal 6, and the power transformer 7 are all electrically connected to the main circuit board 3. The main circuit board 3 integrates a rectifier circuit 31, a voltage regulator circuit 32, and a control circuit 33, which are electrically connected in sequence. The power input bolt terminal 6 is electrically connected to the rectifier circuit 31 of the main circuit board 3 through the power transformer 7. The control circuit 33 of the main circuit board 3 is electrically connected to the LED aluminum-based circuit board 4. The main circuit board 3 also includes a current detection circuit 34 and a current compensation circuit 35, which are electrically connected. The current detection circuit 34 is electrically connected to the power input bolt terminal 6 and the control circuit 33.

[0035] Regarding the LED aluminum-based circuit board 4, it is equipped with an LED light source chip and peripheral circuits. The LED light source chip includes a main LED chip and a secondary LED chip, and the peripheral circuits include a constant current control circuit and a lighting circuit.

[0036] In this embodiment, the housing includes a base 1 and an upper housing 2 attached to the top surface of the base 1 by screws. A storage groove 21 is provided on the side of the upper housing 2. The alarm circuit is attached to the inner bottom surface of the storage groove 21 by screws. The alarm circuit is connected to a main / secondary switching test button 51 and a black light double-off test button 52. Two through holes 23 are provided on the inner bottom surface of the storage groove 21. The two through holes 23 correspond to the main / secondary switching test button 51 and the black light double-off test button 52, respectively, so that the main / secondary switching test button 51 and the black light double-off test button 52 can be adapted to the through holes 23. This facilitates the testing of main / secondary switching, alarm test, black light double-off test and other detection operations during installation and maintenance, and has the advantage of simple operation.

[0037] The heat sink 8 and the LED aluminum-based circuit board 4 cover the slot 101 of the storage groove 21. Regarding the installation method of the heat sink 8 and the LED aluminum-based circuit board 4, corresponding holes are provided at the four corners of both. After attaching the heat sink 8 and the LED aluminum-based circuit board 4 and aligning the corner holes, screws are passed through the corresponding holes on the heat sink 8 and the LED aluminum-based circuit board 4 and threaded onto the edge of the slot 101 of the storage groove 21 to cover the slot 101. The heat sink 8 dissipates the heat generated by the LED aluminum-based circuit board 4 during operation, ensuring that the LED aluminum-based circuit board 4 operates within a suitable temperature range. Simultaneously, the heat sink 8 has a channel 81 that faces the LED light on the LED aluminum-based circuit board 4 to prevent the LED light from being blocked.

[0038] The base 1 has a receiving groove 11 on its bottom surface, and the power transformer 7 and the main circuit board 3 are both housed in the receiving groove 11. The power transformer 7 is made of R-type iron core and has a rated capacity of 5VA. The main circuit board 3 includes a rectifier circuit 31, a voltage regulator circuit 32, a control circuit 33, a current detection circuit 34, and a current compensation circuit 35. The rectifier circuit 31 and voltage regulator circuit 32 are conventional circuits in the prior art. The rectifier circuit 31 is used to rectify and reduce noise in the circuit, and the voltage regulator circuit 32 is used to stabilize the input power supply. The control circuit 33 can use a control chip, such as an STM32 chip or other chips with drive control functions. The control circuit 33 can be used to control the on / off status of the LED lights on the LED aluminum-based circuit board and the switching between main and auxiliary lights. The current detection circuit 34 and the current compensation circuit 35 are used to detect the current in the circuit. During operation, the control current compensation circuit compensates the power supply current to meet the requirement of a current greater than 100mA that the indoor filament monitoring relay can reliably pick up. In case of faults such as blackout, the control current compensation current is disconnected, so that the indoor filament monitoring relay can reliably drop a current of less than 40mA, and the current compensation circuit 35 can be used to compensate the current.

[0039] It should be noted that the above-mentioned rectifier circuit 31, voltage regulator circuit 32, control circuit 33, current detection circuit 34, and current compensation circuit 35 are all conventional technologies in the prior art. The circuit board formed by integrating the above circuits mainly focuses on the superposition of functions.

[0040] The base 1 has a step 13 on its side. Two power interfaces 131 are located on the inner wall of the step 13. These interfaces 131 are electrically connected to the power transformer 7 within the receiving slot 11. The power input bolt terminal 6 is bolted onto the power interface 131. A terminal protective shell 9 is inserted into the step 13. The protective shell has a clearance groove 91 for inserting the power input bolt terminal 6, thus protecting it. The power input bolt terminal 6 is used to connect to an external 220V power supply to provide power to the power transformer 7, which is electrically connected to the main circuit board 3.

[0041] To conceal the wiring present during electrical connections between the upper housing 2 and the base 1, a through-hole 22 is provided on the inner bottom surface of the storage slot 21, and a wiring hole 12 is provided on the top surface of the base 1 corresponding to the through-hole 22. The wiring hole 12 is connected to the receiving slot 11. Therefore, during wiring, the wiring of electronic components in the upper housing 2 and the base 1 can pass through the through-hole 22 and the wiring hole 12 and be electrically connected to the corresponding electronic components, so that the wiring is hidden in the storage slot 21 and the receiving slot 11, making the overall structure aesthetically pleasing and neat.

[0042] In this embodiment, a base bracket 10 is attached to the bottom surface of the base 1 by screws. The base bracket 10 covers the slot 101 of the receiving groove 11, and the power transformer 7 is mounted on the base bracket 10. Regarding the installation method of the main circuit board 3 and the power transformer 7, the base bracket 10 has an opening, and a receiving box 104 is inserted into the opening. The power transformer 7 is inserted into the receiving box 104, and the main circuit board 3 is screwed into the inner wall of the receiving groove 11.

[0043] To facilitate the installation of the ETX-ZS type LED railway signal bulb of this utility model, a downwardly bent reinforcing plate 102 is provided on the side of the base bracket 10, and an insertion port 103 is provided at the bottom of the reinforcing plate 102. Therefore, when installing this device in the railway color light new red mechanism, only two screws are needed for fastening, making installation convenient. When replacing, it is not necessary to completely remove the screws; simply loosening the screws is sufficient for removal. During installation, only the screws need to be inserted into the two insertion ports 103 of the base bracket 10 and the bolts tightened to quickly complete the replacement.

[0044] In addition, in order to improve the flame retardant effect of the overall structure of the ETX-ZS type LED railway signal bulb of this utility model and prevent spontaneous combustion due to excessive temperature, the upper shell 2, the base 1 and the terminal protective shell 9 of this embodiment are all made of flame retardant reinforced nylon material, which has a better flame retardant effect.

[0045] In summary, this utility model incorporates an LED aluminum-based circuit board 4, an alarm circuit board 5, a power input bolt terminal 6, a power transformer 7, and a main circuit board 3 on the housing. The alarm circuit promptly transmits alarm information to the indoor alarm host when the main or auxiliary LED light sources malfunction or go black, alerting railway signaling personnel to replace the equipment in a timely manner. The main power input bolt terminal 6 connects to a 220V power supply. The input power is converted to a suitable voltage range by the power transformer 7, and then rectified and regulated by the rectifier circuit 31 and the voltage regulator circuit 32 to power the LED lights on the LED aluminum-based circuit board 4. Simultaneously, the current detection circuit 34 monitors the input power of the external power supply in real time. When the input power is detected as normal, the control circuit 33 controls the constant current and lighting circuit of the LED aluminum-based circuit board 4 to operate, and the main filament LED chip of the LED aluminum-based circuit board 4 starts working. When the main filament LED chip is damaged, the main filament detection circuit detects an abnormal main filament voltage. At this time, the control circuit 33 controls the constant current and lighting circuit to switch to the auxiliary filament chip of the LED aluminum-based circuit board 4, and the alarm circuit transmits the fault information back to the indoor area, reminding railway signal personnel to replace the equipment in time. When the auxiliary filament LED chip is damaged, the auxiliary filament detection circuit detects that the auxiliary filament LED chip is de-energized. At this time, the device will be in a blackout state and an alarm will sound. Meanwhile, the current compensation circuit 35 can compensate the power supply current in real time to meet the current requirements for reliable energization of the indoor filament monitoring relay. As can be seen, this utility model integrates the functions of the traditional lighting unit, the railway signal incandescent bulb (equivalent to the LED aluminum-based circuit board 4 of this utility model), and the fixed-focus plate base 1 (equivalent to the housing of this utility model) into one unit, making the overall structure compact. At the same time, the snap-fit ​​installation method is eliminated to prevent the situation of blacking out due to structural aging and loosening. Meanwhile, the LED aluminum-based circuit board 4, alarm circuit board 5, main circuit board 3, power input bolt terminal 6, power transformer 7 and other components are connected by electrical connection, avoiding a series of problems such as poor contact and corrosion, thereby preventing the occurrence of faults such as blacking out and false alarms.

[0046] Additionally, it should be noted that traditional outdoor signal system equipment, such as Figure 1As shown, it uses an external transformer with an internal rated capacity of 34VA to output adjustable AC voltages of 13V, 14V, and 16V respectively. This allows for adjustment of the lighting unit's output voltage to meet the operating voltage requirements of a 12V, 25W signal bulb, even when there is voltage loss due to varying distances between the indoor power cabinet and the signal mechanism. In contrast, the power transformer 7 of this invention has a rated capacity of 5VA, only needing to meet the operating requirements of a 6.5V, 2.45W DC LED aluminum-based circuit board 4. Therefore, the 220V AC input voltage used in this device is converted to 14V AC voltage by the power transformer 7, and after rectification and voltage regulation, outputs 5V DC to power the chip and 12V DC to power the relay. This is more energy-efficient than the original lighting unit. Therefore, the ETX-ZS type LED railway signal bulb of this invention can meet the operating voltage requirements when installed in a long-distance signal mechanism within a section and under conditions of line voltage loss. The ETX-ZS type LED railway signal bulb also meets the operating current requirements of the indoor relay H18 in the case of an existing lighting system.

[0047] like Figures 3 to 8 As shown above, based on the structural description of the ETX-ZS type LED railway signal bulb of this utility model, the following further describes the installation method and process of this utility model:

[0048] S10: Install the alarm circuit board 5 inside the upper housing 2 and fix it to the bottom surface of the storage slot 21 with screws. Connect the alarm circuit board 5 to the main circuit board 3 with wires. Install the LED aluminum-based circuit board 4 on the upper housing 2. Attach the heat sink 8 to the LED aluminum-based circuit board 4 and fix them to the upper housing 2 with screws, so that the LED aluminum-based circuit board 4 covers the slot 101 of the storage slot 21. Connect the LED aluminum-based circuit board 4 to the main circuit board 3 with wires. Secure the upper housing 2 to the base 1 with bolts. Fix the power input bolt terminal 6 to the step 13 of the base 1 and connect it to the main circuit board 3 with wires. Install the terminal protective shell 9 on the step 13.

[0049] S20: Secure the main circuit board 3 to the receiving slot 11 of the base 1 with bolts. Install the power transformer 7 on the base bracket 10. Connect the main circuit board 3 to the LED aluminum base circuit board 4, the alarm circuit board 5, the power input bolt terminal 6, and the power transformer 7 with wires. Install the base bracket 10 together with the base 1 and secure it with screws. This completes the installation process of the ETX-ZS type LED railway signal light bulb.

[0050] The following further describes the working process of the ETX-ZS type LED railway signal bulb of this utility model:

[0051] The power input bolt terminal 6 of the ETX-ZS LED railway signal bulb connects to an external 220V AC power supply. This device uses 220V AC power, which is converted to 14V AC voltage by the power transformer module 7. After rectification circuit 31 and voltage regulator circuit 32, it outputs 5V DC to power the control chip and 12V DC to power the relays (these relays are used in the main circuit board 3 to connect the current compensation circuit 35 and the current detection circuit 34; the number of relays is set according to actual conditions). After the control circuit 33 detects that the rectified 14V voltage is normal, it controls the relays to connect the current compensation circuit 35, ensuring stable current compensation at the power input terminal and guaranteeing the reliable current requirement for the indoor H18 relay. At this time, the current detection circuit 34 detects the power input current. When the measured value is lower than the program-set value, it indicates that the power supply voltage is too low or the compensation circuit is faulty, and the ETX-ZS LED railway signal bulb will not work and will be in a blackout state. When the current detection result is normal, the control circuit 33 will control the constant current and lighting circuit of the LED aluminum-based circuit board 4 to operate, and cause the main wire LED chip of the LED aluminum-based circuit board 4 to start working. When the main wire LED chip is damaged, the main wire detection circuit detects that the main wire voltage is abnormal. At this time, the control circuit 33 will control the constant current and lighting circuit to switch the auxiliary wire chip of the LED aluminum-based circuit board 4 to work, and the alarm circuit will transmit the fault information back to the room to remind the railway signal staff to replace the equipment in time. When the auxiliary wire LED chip is damaged, the auxiliary wire detection circuit detects that the auxiliary wire LED chip is de-energized. At this time, the device will be in a blackout state and an alarm will sound. The constant current and lighting circuit will output a constant current of 240mA to power the LED chip. No matter how the external voltage fluctuates, it will not affect the brightness and intensity of the LED light, providing a stable light signal for the railway signaling system.

[0052] The embodiments of this utility model are not limited thereto. Based on the above content of this utility model, using ordinary technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, this utility model can also be modified, replaced or combined in various other forms, all of which fall within the scope of protection of this utility model.

Claims

1. An ETX-ZS type LED railway signal bulb, characterized in that, The device includes a housing, and an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer, and a main circuit board disposed on the housing. The LED aluminum-based circuit board, the alarm circuit board, the power input bolt terminal, and the power transformer are all electrically connected to the main circuit board. The main circuit board integrates a rectifier circuit, a voltage regulator circuit, and a control circuit that are electrically connected in sequence. The power input bolt terminal is electrically connected to the rectifier circuit of the main circuit board through the power transformer. The control circuit of the main circuit board is electrically connected to the LED aluminum-based circuit board. The main circuit board also includes an electrically connected current detection circuit and a current compensation circuit. The current detection circuit is electrically connected to the power input bolt terminal and the control circuit.

2. The ETX-ZS type LED railway signal bulb as described in claim 1, characterized in that, It also includes a heat sink disposed on the housing, the LED aluminum-based circuit board is attached to the heat sink, the heat sink has a channel, and the channel is directly opposite the LED light of the LED aluminum-based circuit board.

3. The ETX-ZS type LED railway signal bulb as described in claim 2, characterized in that, The housing includes a base and an upper housing disposed on the base. The upper housing has a storage groove on its side, and the alarm circuit is disposed in the storage groove. The heat sink and the LED aluminum-based circuit board cover the opening of the storage groove. The bottom surface of the base has a receiving groove, and the power transformer and the main circuit board are disposed in the receiving groove. The bottom surface of the storage groove has a through hole, and the top surface of the base has a cable routing hole corresponding to the through hole. The cable routing hole is connected to the receiving groove.

4. The ETX-ZS type LED railway signal bulb as described in claim 3, characterized in that, The alarm circuit is connected to a main / secondary switching test button and a blackout double-off test button. The inner bottom surface of the storage slot has two through holes, which correspond to the main / secondary switching test button and the blackout double-off test button, respectively.

5. The ETX-ZS type LED railway signal bulb as described in claim 3, characterized in that, The base has a step on its side, and the step has a power interface. The power interface is electrically connected to the power transformer, and the power input bolt terminal is located on the power interface.

6. The ETX-ZS type LED railway signal bulb as described in claim 5, characterized in that, The step is provided with a terminal protective shell, and the terminal protective shell has a clearance groove for the power input bolt terminal to be inserted.

7. The ETX-ZS type LED railway signal bulb as described in claim 3, characterized in that, The base has a base support on its bottom surface, which covers the opening of the receiving groove. The base support has an opening, through which a receiving box is inserted and fitted. The power transformer is inserted and fitted inside the receiving box, and the main circuit board is located on the inner wall of the receiving groove.

8. The ETX-ZS type LED railway signal bulb as described in claim 7, characterized in that, The base support has a downwardly bent reinforcing plate on its side, and the bottom of the reinforcing plate has an insertion port.

9. The ETX-ZS type LED railway signal bulb as described in claim 1, characterized in that, The shell is made of flame-retardant reinforced nylon material.

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