ETX-ZS type LED railway signal bulb

Abstract

The invention discloses an ETX-ZS type LED railway signal bulb which comprises a shell, an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer and a main circuit board, wherein the LED aluminum-based circuit board, the alarm circuit board, the power input bolt terminal, the power transformer and the main circuit board are arranged on the shell. The LED aluminum-based circuit board, the alarm circuit board, the power input bolt terminal and the power transformer are all electrically connected with the main circuit board. A rectifying circuit, a voltage stabilizing circuit and a control circuit which are electrically connected in sequence are integrated on the main circuit board, the power input bolt terminal is electrically connected with the rectifying circuit of the main circuit board through a power transformer, the control circuit of the main circuit board is electrically connected with the LED aluminum base circuit board, and the main circuit board further comprises a current detection circuit and a current compensation circuit which are electrically connected. The current detection circuit is electrically connected with the power supply input bolt terminal, and the current detection circuit is electrically connected with the control circuit. By adopting the above arrangement, the problems of poor contact, corrosion and the like can be effectively avoided, so that the occurrence of faults such as black lights, disordered alarms and the like caused by the problems is prevented.

Description

Technical Field

[0001] The invention discloses an LED point light source specially used in a railway signal system, belongs to the technical field of railway signal lamps, and specifically relates to an ETX-ZS type LED railway signal lamp. Background Art

[0002] In the prior art, the outdoor part of the railway signal light system consists of a railway signal light bulb and a matching lighting unit and a fixed focus plate base. Figure 1 The figure shows the outdoor equipment of the traditional signal system, (1) is the railway color light signal mechanism, (2) is the ground XB box, (3) is the lighting unit, (4) is the fixed focus plate base, and (5) is the railway signal bulb. The box distributes AC220v power according to the actual situation on site. Figure 2 As shown, the lighting unit is installed in a box or a color light signal mechanism, and the focus plate base and the railway signal bulb are installed in the color light signal mechanism.

[0003] Among them, the connecting wires between (3) the lighting unit and (4) the focus plate base are often connected incorrectly or mixed up when installing or replacing equipment; the main and auxiliary wire reeds of the focus plate base will become fatigued and lose their elasticity after long-term use, causing poor contact between (5) the railway signal bulb and the main and auxiliary wire reeds of the focus plate base, resulting in black lights, random alarms and other faults. Moreover, when working in harsh outdoor environments for a long time, the main and auxiliary wire reeds will rust and increase in resistance, which will lead to poor conduction with the bulb, resulting in black lights, random alarms and other faults. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an ETX-ZS type LED railway signal bulb, which can effectively avoid a series of problems such as poor contact and rust, thereby preventing the occurrence of faults such as black lights and random alarms caused by the above.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] An ETX-ZS type LED railway signal bulb comprises a shell, and an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer, and a main circuit board arranged on the shell; 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 stabilizing 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 current detection circuit is electrically connected to the control circuit.

[0007] Furthermore, it also includes a heat sink arranged on the shell, the LED aluminum-based circuit board is attached to the heat sink, the heat sink is provided with a channel, and the channel is directly opposite to the LED lamp of the LED aluminum-based circuit board.

[0008] Furthermore, the shell includes a base and an upper shell arranged on the base, a storage groove is provided on the side of the upper shell, the alarm circuit is arranged in the storage groove, and the heat sink and the LED aluminum-based circuit board cover the notch of the storage groove; a receiving groove is provided on the bottom surface of the base, and the power transformer and the main circuit board are both arranged in the receiving groove; a wire passing hole is provided on the bottom surface of the storage groove, and a wire arrangement hole is provided on the top surface of the base corresponding to the wire passing hole, and the wire arrangement hole is connected to the receiving groove.

[0009] Furthermore, the alarm circuit is connected to a main-sub switch test button and a black light double break test button, and the inner bottom surface of the storage slot is provided with two through holes, which respectively correspond to the main-sub switch test button and the black light double break test button.

[0010] The present invention has the following beneficial effects:

[0011] The present invention arranges 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 can timely transmit alarm information to an indoor alarm host when the main and auxiliary LED light sources are damaged or black light fails, so as to remind railway signal staff to replace the equipment in time. The power input bolt terminal is connected to a 220V power supply. The input power is converted into a suitable voltage range through a power transformer, and then the power voltage is rectified and stabilized after passing through a rectifier circuit and a voltage regulator circuit, and the LED lamp of the LED aluminum-based circuit board is powered; at the same time, the current detection circuit will monitor the input power of the external power supply in real time. When the detection result of the input power is normal, the control circuit will control the constant current and lighting circuit of the LED aluminum-based circuit board to operate, and the main wire LED chip of the LED aluminum-based circuit board will start to work; 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 will control the constant current and lighting circuit to switch to the auxiliary wire chip of the LED aluminum-based circuit board, 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 powered off. At this time, the device will be in a black light state and alarm. At the same time, the current compensation circuit can compensate the power supply current in real time to meet the current requirements of the indoor filament supervision relay to be reliably absorbed. It can be seen from this that the present invention integrates the functions of the traditional lighting unit and the railway signal incandescent bulb (equivalent to the LED aluminum-based circuit board of the present invention) and the fixed-focus disk base (equivalent to the shell of the present invention) to make the overall structure compact, and at the same time cancels the snap-on installation connection to prevent the occurrence of black lights due to structural aging and loosening. At the same time, the LED aluminum-based circuit board, alarm circuit board, main circuit board, power input bolt terminal, power transformer and other components are connected using an electrical connection method, avoiding a series of problems such as poor contact and rust, thereby preventing the occurrence of black lights, random alarms and other faults caused by this. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is outdoor equipment of this traditional signal system.

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

[0014] Figure 3 It is a schematic diagram of the structure of the ETX-ZS type LED railway signal bulb of the present invention.

[0015] Figure 4 It is an exploded schematic diagram of the ETX-ZS type LED railway signal bulb of the present invention.

[0016] Figure 5It is a structural schematic diagram of the ETX-ZS type LED railway signal bulb of the present invention from another perspective.

[0017] Figure 6 The figure is a working principle diagram of the ETX-ZS type LED railway signal bulb of the present invention.

[0018] Figure 7 The schematic diagram of the control circuit of the ETX-ZS type LED railway signal bulb of the present invention.

[0019] Figure 8 The schematic diagram is a schematic diagram of an LED aluminum-based circuit board of an ETX-ZS type LED railway signal bulb of the present invention.

[0020] In the figure:

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

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

[0023] 3. Main circuit board; 31. Rectification circuit; 32. Voltage stabilization 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 and auxiliary switching test button; 52. Black light double break test button;

[0026] 6. Power input screw terminal;

[0027] 7. Power transformer;

[0028] 8. heat sink; 81. channel;

[0029] 9. Terminal protection shell; 91. Air-avoiding groove;

[0030] 10. Base bracket; 101. Notch; 102. Reinforcement plate; 103. Socket; 104. Accommodation box. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of their relative relationship shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0032] The present invention aims at the traditional outdoor equipment of the signal system, which will rust and increase the resistance after working in a harsh environment for a long time, and at the same time make it difficult to conduct well with the bulb, thereby causing faults such as black light and random alarms. The present invention has developed and designed the ETX-ZS type LED railway signal bulb, which integrates all the functions of the lighting unit, the fixed focus disk base 1, and the railway signal incandescent bulb, and cancels the line wire connection and the snap-on installation method to prevent such situations from occurring. At the same time, the internal LED aluminum-based circuit board 4, the alarm circuit board 5, the main circuit board 3, the power input bolt terminal 6, the power transformer 7 and other components are connected by an electrical connection method, avoiding a series of problems such as poor contact and rust, thereby preventing the occurrence of faults such as black light and random alarms caused by them.

[0033] Based on this, the structure and principle of the ETX-ZS type LED railway signal bulb of the present invention are described in detail below:

[0034] An ETX-ZS type LED railway signal bulb, such as Figures 3 to 8 As shown, it includes a shell, 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 arranged on the shell. 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 stabilizing circuit 32, and a control circuit 33 that 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, and the main circuit board 3 also includes an electrically connected current detection circuit 34 and a current compensation circuit 35, the current detection circuit 34 is electrically connected to the power input bolt terminal 6, and the current detection circuit 34 is electrically connected to the control circuit 33.

[0035] As for the LED aluminum-based circuit board 4, it is provided with an LED light source chip and a peripheral circuit, wherein the LED light source chip includes a main filament LED chip and a secondary filament LED chip, and the peripheral circuit includes a constant current control and lighting circuit.

[0036] In this embodiment, the shell includes a base 1 and an upper shell 2 installed on the top surface of the base 1 by screws. A storage groove 21 is provided on the side of the upper shell 2. The alarm circuit is installed on the inner bottom surface of the storage groove 21 by screws. The alarm circuit is connected with a main-sub conversion test button 51 and a black light double break 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-sub conversion test button 51 and the black light double break test button 52 respectively, so that the main-sub conversion test button 51 and the black light double break test button 52 can be adapted to the through holes 23, so as to facilitate the main-sub conversion, alarm test, black light double break test and other detection operations during installation and maintenance operations, and has the advantage of simple operation.

[0037] The heat sink 8 and the LED aluminum-based circuit board 4 cover the notch 101 of the storage slot 21. Regarding the installation method of the heat sink 8 and the LED aluminum-based circuit board 4, the four top corners of the heat sink 8 and the LED aluminum-based circuit board 4 are provided with corresponding holes. After the heat sink 8 and the LED aluminum-based circuit board 4 are attached and the holes of the top corners are aligned, the screws pass through the corresponding holes of the heat sink 8 and the LED aluminum-based circuit board 4, and the screws are locked on the edge of the notch 101 of the storage slot 21 to cover the notch 101 of the storage slot 21, and the heat sink 8 is used to dissipate the heat generated by the LED aluminum-based circuit board 4 during operation to ensure that the LED aluminum-based circuit board 4 works within a suitable temperature range. At the same time, the heat sink 8 is provided with a channel 81, and the channel 81 is aligned with the LED lamp of the LED aluminum-based circuit board 4 to prevent the LED lamp from being blocked.

[0038] The bottom surface of the base 1 is provided with a receiving groove 11, and the power transformer 7 and the main circuit board 3 are both arranged in the receiving groove 11. The power transformer 7 is wound with an R-type iron core, and the rated capacity is 5VA. The main circuit board 3 includes a rectifier circuit 31, a voltage stabilizing circuit 32, a control circuit 33, a current detection circuit 34, and a current compensation circuit 35. Among them, the rectifier circuit 31 and the voltage stabilizing circuit 32 are both conventional circuits in the prior art. The rectifier circuit 31 is used to rectify and reduce noise in the circuit, and the voltage stabilizing 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 and off of the LED lamp of the LED aluminum-based circuit board and the switching of the main and auxiliary lights. The current detection circuit 34 and the current compensation circuit 35 are used to detect the current of the circuit. When working, the control current compensation circuit compensates the power supply current to meet the current requirement of more than 100mA that the indoor filament supervision relay can reliably absorb. When there is a fault such as a black light, the control current compensation current is disconnected to make the indoor filament supervision relay reliably drop the current requirement of less than 40mA; the current compensation circuit 35 is used to compensate the current.

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

[0040] A step 13 is provided on the side of the base 1, and two power interfaces 131 are provided on the inner wall of the step 13. The two power interfaces 131 are electrically connected to the power transformer 7 in the accommodating groove 11, and the power input bolt terminal 6 is bolted on the power interface 131. The step 13 is plugged with a terminal protection shell 9, and the protection shell is provided with an air avoidance groove 91, and the air avoidance groove 91 is for the power input bolt terminal 6 to be inserted, so as to achieve the function of protecting the power input bolt terminal 6. The power input bolt terminal 6 is used to connect an external 220V power supply to provide power to the power transformer 7, and the power transformer 7 is electrically connected to the main circuit board 3.

[0041] In order to hide the circuits when the components between the upper shell 2 and the base 1 are electrically connected, a through hole 22 is provided on the inner bottom surface of the storage groove 21, and a cable arrangement hole 12 is provided on the top surface of the base 1 corresponding to the through hole 22, and the cable arrangement hole 12 is connected to the receiving groove 11. Therefore, when wiring, the circuits of the electronic components of the upper shell 2 and the base 1 can pass through the through hole 22 and the cable arrangement hole 12, and then be electrically connected to the corresponding electronic components, so that the circuits are hidden in the storage groove 21 and the receiving groove 11, making the overall structure beautiful and neat.

[0042] In this embodiment, a base bracket 10 is installed on the bottom surface of the base 1 by screw locking, and the base bracket 10 covers the notch 101 of the receiving groove 11, and the power transformer 7 is arranged on the base bracket 10. Regarding the installation method of the main circuit board 3 and the power transformer 7, the base bracket 10 is provided with a through opening, and the through opening is plugged with a receiving box 104, and the power transformer 7 is plugged and fitted in the receiving box 104, and the main circuit board 3 is screwed and fitted on the inner wall of the receiving groove 11.

[0043] In order to realize the installation of the overall structure of the ETX-ZS type LED railway signal bulb of the present invention, a downwardly bent reinforcement plate 102 is provided on the side of the base bracket 10, and a socket 103 is provided at the bottom of the reinforcement plate 102. Therefore, when the device is installed in the railway color lamp new red mechanism, only two screws are needed to tighten it, and the installation is convenient. When replacing, there is no need to completely disassemble the screws, and only the screws need to be loosened to remove them. When installing, only the screws need to be inserted into the two sockets 103 of the base bracket 10 and the bolts are tightened, and the replacement can be completed quickly.

[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 the present invention to prevent spontaneous combustion due to excessive temperature, the upper shell 2, base 1 and terminal protective shell 9 of this embodiment are all made of flame retardant reinforced nylon material, which has better flame retardant effect.

[0045] In summary, the present invention is provided with 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. Among them, the alarm circuit can timely transmit the alarm information to the indoor alarm host when the main and auxiliary LED light sources are damaged or black light fails, so as to remind the railway signal staff to replace the equipment in time. The power input bolt terminal 6 is connected to a 220V power supply, and the input power is converted into a suitable voltage range through a power transformer 7, and then after passing through a rectifier circuit 31 and a voltage stabilizing circuit 32, the power supply voltage is rectified and stabilized, and the LED lamp of the LED aluminum-based circuit board 4 is powered; at the same time, the current detection circuit 34 will monitor the input power of the external power supply in real time. When the detection result of the input power 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 the main wire LED chip of the LED aluminum-based circuit board 4 will start to work; when the main wire LED chip is damaged, the main wire detection circuit detects that the main wire voltage is abnormal, and at this time, the control circuit 33 will control the constant current and lighting circuit to switch to the auxiliary wire chip of the LED aluminum-based circuit board 4, 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 powered off, and the device will be in a black light state and alarm. At the same time, the current compensation circuit 35 can compensate the power supply current in real time to meet the current requirements of the indoor filament supervision relay to be reliably absorbed. It can be seen from this that the present invention integrates the functions of the traditional lighting unit and the railway signal incandescent bulb (equivalent to the LED aluminum-based circuit board 4 of the present invention) and the fixed-focus disk base 1 (equivalent to the shell of the present invention) to make the overall structure compact, and at the same time cancels the snap-on installation connection to prevent the occurrence of black lights due to structural aging and loosening. At the same time, the LED aluminum-based circuit board 4, the alarm circuit board 5, the main circuit board 3, the power input bolt terminal 6, the power transformer 7 and other components are connected using an electrical connection method, avoiding a series of problems such as poor contact and rust, thereby preventing the occurrence of black lights, random alarms and other faults caused by this.

[0046] In addition, it should be noted that traditional signal system outdoor equipment, such as Figure 1As shown, it uses an external transformer with an internal rated capacity of 34VA, which outputs adjustable voltages of 13V, 14V, and 16V respectively, so that when there is line voltage loss due to the different distances between the indoor power cabinet and the signal mechanism, the output voltage of the lighting unit is adjusted to meet the working voltage requirements of 12V and 25W signal bulbs. However, the difference is that the power transformer 7 of the present invention has a rated capacity of 5VA, which only needs to meet the working requirements of the LED aluminum-based circuit board 4 of 6.5V and 2.45W. Therefore, the AC 220V input voltage used by the device is converted into 14V AC voltage through the power transformer 7, and after the rectification and voltage stabilization module, the DC 5V is output to power the chip, and the DC 12V is used to power the relay. This is more energy-efficient than the original lighting unit. Therefore, the ETX-ZS type LED railway signal bulb of the present invention can meet the working voltage requirements when installed in a long-distance signal mechanism in the interval and there is line voltage loss. The ETX-ZS type LED railway signal bulb meets the working current requirements of the indoor relay H18 in the case of an existing lighting system.

[0047] like Figures 3 to 8 As shown, based on the above description of the structure of the ETX-ZS type LED railway signal bulb of the present invention, the installation method and process of the present invention are further described below:

[0048] S10: Install the alarm circuit board 5 in the upper housing 2 and fix it to the bottom surface of the storage slot 21 with screws, and 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, fit the heat sink 8 and the LED aluminum-based circuit board 4 together, and fix them to the upper housing 2 with screws so that the LED aluminum-based circuit board 4 covers the notch 101 of the storage slot 21, and connect the LED aluminum-based circuit board 4 to the main circuit board 3 with wires; fasten the upper housing 2 to the base 1 with bolts; fix the power input bolt terminal 6 on the step 13 of the base 1, and connect it to the main circuit board 3 with wires; install the terminal protection shell 9 on the step 13;

[0049] S20: Fix the main circuit board 3 in the receiving groove 11 of the base 1 with bolts, install the power transformer 7 on the base bracket 10, and connect the main circuit board 3 with the LED aluminum-based 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 with the base 1 and fix it with screws. This completes the installation process of the ETX-ZS type LED railway signal light bubble.

[0050] The following further introduces the working process of the ETX-ZS type LED railway signal bulb of the present invention:

[0051] The power input screw terminal 6 of the ETX-ZS type LED railway signal bulb is connected to an external 220v AC power supply. This device uses 220v AC power supply, which is converted into 14v AC voltage by the power transformer 7 module, and outputs 5v DC to power the control chip after passing through the rectifier circuit 31 and the voltage regulator circuit 32, and 12v DC to power the relay (the relay is used to connect the current compensation circuit 35 and the current detection circuit 34 in the main circuit board 3, and the corresponding number of relays is set according to the actual situation); after the control circuit 33 detects that the rectified 14v voltage is normal, the control relay is connected to the current compensation circuit 35, so that the power input end obtains stable current compensation, ensuring that the indoor H18 relay can reliably absorb the current demand; at this time, the current detection circuit 34 detects the current input of the power supply. When the measured value is lower than the value set by the program, it means that the power supply voltage is too low or the compensation circuit is faulty, and the ETX-ZS type LED railway signal bulb will not work and will be in a black light 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 make the main wire LED chip of the LED aluminum-based circuit board 4 start to work; when the main wire LED chip is damaged, the main wire detection circuit detects that the main wire voltage is abnormal, and the control circuit 33 will control the constant current and lighting circuit to switch to 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 powered off, and the device will be in a black light state and alarm. The constant current and lighting circuit will output a constant current of 240mA to power the LED chip, and 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 signal system.

[0052] The implementation methods of the present invention are not limited to this. According to the above content of the present invention, using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the present invention, the present invention can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the present invention.

Claims

1. An ETX-ZS type LED railway signal bulb, characterized in that: It includes a shell, and an LED aluminum-based circuit board, an alarm circuit board, a power input bolt terminal, a power transformer, and a main circuit board arranged on the shell; 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 stabilizing 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 current detection circuit is electrically connected to the control circuit.

2. The ETX-ZS type LED railway signal bulb according to claim 1, characterized in that: It also includes a heat sink arranged on the shell, the LED aluminum-based circuit board is in contact with the heat sink, the heat sink is provided with a channel, and the channel is directly opposite to the LED lamp of the LED aluminum-based circuit board.

3. The ETX-ZS type LED railway signal bulb as claimed in claim 2, characterized in that: The shell includes a base and an upper shell arranged on the base, a storage groove is provided on the side of the upper shell, the alarm circuit is arranged in the storage groove, and the heat sink and the LED aluminum-based circuit board cover the notch of the storage groove; a receiving groove is provided on the bottom surface of the base, and the power transformer and the main circuit board are both arranged in the receiving groove; a wire through hole is provided on the bottom surface of the storage groove, and a wire arrangement hole is provided on the top surface of the base corresponding to the wire through hole, and the wire arrangement hole is connected with the receiving groove.

4. The ETX-ZS type LED railway signal bulb as claimed in claim 3, characterized in that: The alarm circuit is connected to a main-subswitching test button and a black light double-break test button. The inner bottom surface of the storage slot is provided with two through holes, which respectively correspond to the main-subswitching test button and the black light double-break test button.

5. The ETX-ZS type LED railway signal bulb as claimed in claim 1, characterized in that: A step is provided on the side of the base, and a power-on interface is provided on the step. The power-on interface is electrically connected to the power transformer, and the power input bolt terminal is provided on the power-on interface.

6. The ETX-ZS type LED railway signal bulb as claimed in claim 5, characterized in that: The step is provided with a terminal protection shell, and the terminal protection shell is provided with an air avoidance groove, and the air avoidance groove is used for the power input bolt terminal to be inserted.

7. The ETX-ZS type LED railway signal bulb according to claim 1, characterized in that: A base bracket is arranged on the bottom surface of the base, the base bracket covers the notch of the accommodating groove, the base bracket is provided with a through opening, the through opening is plugged into a accommodating box, the power transformer is plugged into the accommodating box, and the main circuit board is arranged on the inner wall of the accommodating groove.

8. The ETX-ZS type LED railway signal bulb as claimed in claim 7, characterized in that: A downwardly bent reinforcing plate is arranged on the side of the base bracket, and a socket is arranged at the bottom of the reinforcing plate.

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

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