Airplane smoke detector test board

Abstract

The utility model relates to an airplane smoke detector testboard, and belongs to the technical field of airplane smoke detector testing. Comprising a test panel, a power supply input module, a voltage stabilization module, a CAN bus address selection module, a CAN bus debugging module, an LED indication module, a discrete signal input module, a relay load module, a signal voltage conversion module, a display module and a main control module, the power supply input module is connected with the voltage stabilization module, and the voltage stabilization module is connected with the CAN bus debugging module and a control module. The CAN bus debugging module is connected with the main control module through the signal voltage conversion module, and the test panel is provided with a connector and a band switch; according to the utility model, the testboard is connected with a machine part through the connector, the machine part is powered, test signals are input and controlled through each module, communication, control and signal transmission between the testboard and the machine part are carried out, whether the machine part carries out corresponding driving or not is checked, functions of the machine part are verified, fault detection is carried out, and normal use of the testboard and the machine part is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft smoke detector testing, and particularly relates to an aircraft smoke detector test bench. Background Technique

[0002] With the continuous development of aviation technology, the requirements for the aircraft cabin smoke detection system are getting higher and higher; only by giving an early warning of a fire can the aircraft cabin smoke detection system minimize losses to the greatest extent and ensure the safety of the aircraft. Aircraft cabin smoke detectors are generally installed in the cargo holds and toilets of aircraft. When a malfunction occurs or regular inspections are required, maintenance personnel will remove the on-board smoke detectors for maintenance and testing, eliminate faults, and ensure their normal use; therefore, an aircraft smoke detector test bench is needed to test aircraft smoke detectors. Summary of the Invention

[0003] In order to overcome the problems mentioned in the background technique, the utility model provides an aircraft smoke detector test bench. The utility model connects the test bench with the machine parts through a connector, supplies power to each module of the machine parts, inputs test signals and controls, conducts communication, control and signal transmission between the test bench and the machine parts, checks whether the machine parts perform corresponding drives, verifies the functions of the machine parts and conducts fault detection to ensure their normal use.

[0004] To achieve the above object, the utility model is realized by the following technical solution: An aircraft smoke detector test bench includes a test panel 1, a power input module 2, a voltage stabilizing module 3, a CAN bus address selection module 4, a CAN bus debugging module 5, an LED indication module 6, a discrete signal input module 7, a relay load module 8, a signal voltage conversion module 9, a display module 10 and a main control module 11. The power input module 2 is connected to the voltage stabilizing module 3, the voltage stabilizing module 3 is connected to the CAN bus debugging module 5 and the main control module 11. The CAN bus debugging module 5 is connected to the main control module 11 through the signal voltage conversion module 9. The LED indication module 6, the discrete signal input module 7, the relay load module 8 and the display module 10 are all connected to the main control module 11. A connector 12 and a wave switch 17 are installed on the test panel 1.

[0005] Further, a plurality of connectors 12 are installed on the test panel 1. The connectors 12 include a nine-pin CAN bus connector 13, a fifteen-pin aviation connector 14 and a twenty-five-pin general connector 15. The nine-pin CAN bus connector 13 is connected to the CAN bus debugging module 5. The fifteen-pin aviation connector 14 and the twenty-five-pin general connector 15 are connected to the main control module 11.

[0006] Further, the LED indication module 6 includes a plurality of indicator lights 16, and the indicator lights 16 include nine indicator lights for indicating the operation of the relay and two indicator lights for indicating the functions of the components.

[0007] Further, a plurality of toggle switches 17 are also installed on the test panel 1. The toggle switches 17 include a three-position TEST SELECT status selection switch, a four-position COMMON SELECT selection switch, and a twelve-position TP test point selection switch. The toggle switches 17 are connected to the main control module 11.

[0008] Further, the MCU of the main control module 11 uses an STM32F407 single-chip microcomputer.

[0009] Further, the power input module 2 includes a double-pole double-throw switch S2.

[0010] Advantages of the present utility model:

[0011] The present utility model connects the test bench to the components through a connector, and supplies power to the components through the power input module, voltage stabilization module, CAN bus address selection module, CAN bus debugging module, discrete signal input module, relay load module, signal voltage conversion module, and main control module, inputs test signals and controls, conducts communication, control, and signal transmission between the test bench and the components, checks whether the components perform corresponding drives, verifies the functions of the components, and conducts fault detection to ensure its normal use. Description of the drawings

[0012] Figure 1 is a schematic diagram of the test system of the present utility model.

[0013] Figure 2 is a schematic diagram of the power input module circuit of the present utility model.

[0014] Figure 3 is a schematic diagram of the voltage stabilization module circuit of the present utility model.

[0015] Figure 4 is a schematic diagram of the LED indication module circuit of the present utility model.

[0016] Figure 5 is a schematic diagram of the discrete signal input module circuit of the present utility model.

[0017] Figure 6 is a schematic diagram of the relay load module circuit of the present utility model.

[0018] Figure 7 is a schematic diagram of the CAN bus address selection module circuit of the present utility model.

[0019] Figure 8It is a schematic diagram of the CAN bus debugging module circuit of the present utility model.

[0020] Figure 9 It is a schematic diagram of the signal voltage conversion module circuit of the present utility model.

[0021] Figure 10 It is a schematic diagram of the display module circuit of the present utility model.

[0022] Figure 11 It is a schematic diagram of the connector connection of the present utility model.

[0023] Figure 12 It is a schematic diagram of the TP test point selection switch of the twelve-speed of the present utility model.

[0024] Figure 13 It is a schematic diagram of the test panel of the present utility model.

[0025] Figure 14 It is Figure 13 One of the enlarged schematic diagrams.

[0026] Figure 15 It is Figure 13 One of the enlarged schematic diagrams.

[0027] Figure 16 It is Figure 13 One of the enlarged schematic diagrams.

[0028] Reference numerals: In the figure, the test panel 1, the power input module 2, the voltage stabilizing module 3, the CAN bus address selection module 4, the CAN bus debugging module 5, the LED indication module 6, the discrete signal input module 7, the relay load module 8, the signal voltage conversion module 9, the display module 10, the main control module 11, the connector 12, the CAN bus connector 13, the fifteen-pin aviation connector 14, the twenty-five-pin general connector 15, the indicator light 16, the wave band switch 17. Detailed implementation manners

[0029] In order to make the purpose, technical solutions and beneficial effects of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below in conjunction with the attached drawings for the convenience of those skilled in the art to understand.

[0030] Such as Figure 1-16, the utility model discloses a test bench for aircraft smoke detectors. The test bench for aircraft smoke detectors includes a test panel 1, a power input module 2, a voltage stabilizing module 3, a CAN bus address selection module 4, a CAN bus debugging module 5, an LED indication module 6, a discrete signal input module 7, a relay load module 8, a signal voltage conversion module 9, a display module 10 and a main control module 11. The power input module 2 is connected to the voltage stabilizing module 3, and the voltage stabilizing module 3 is connected to the CAN bus debugging module 5 and the main control module 11. The CAN bus debugging module 5 is connected to the main control module 11 through the signal voltage conversion module 9. The LED indication module 6, the discrete signal input module 7, the relay load module 8 and the display module 10 are all connected to the main control module 11. The test panel is installed on the test bench. A connector 12 and a band switch 17 are installed on the test panel 1. Other test holes, switches and buttons required for testing are also provided on the test panel. The power input module includes a power access hole provided on the test panel, and a 28VDC power supply (provided by an external voltage stabilizing power supply (HS-SB-0003)) is accessed. The voltage stabilizing module 3 includes chips LM317 and LM7805. After the power supply passes through the chips LM317 and LM7805, 12VDC and 5VDC are respectively output to supply power to the CAN bus debugging module and the main control module. When testing, two discrete signals need to be simulated through the discrete signal input module. One discrete signal controls the self-check of the smoke detector, and one discrete signal controls the disablement and enablement of the audio alarm. The discrete signal input module includes a switch S21. The switch S21 shorts two input pins together to realize the audio alarm. When testing, the output load of the relay is simulated through the relay load module for testing. The CAN bus debugging module includes chips MCP2551ESN and ADUM1201AR. The chip MCP2551ESN is used as the communication transceiver of the CAN bus, and the ADUM1201AR chip is selected as the signal isolation chip. And when testing, an independent 5VDC needs to be input to supply power to the communication transceiver of the CAN bus debugging module. The independent 5V is provided by a voltage stabilizing power supply (HS-SB-0075), and 5VDC power supply (provided by an external voltage stabilizing power supply (HS-SB-0075)) is accessed through the power access hole. The MCU of the main control module uses the STM32F407 single-chip microcomputer, the working voltage is 3.3V, and the pin output voltage is 3.3V. The level conversion needs to be carried out through the signal voltage conversion module to realize the CAN bus communication. The signal voltage conversion module uses the voltage conversion chip 74LS14. When debugging the CAN bus communication, in order to display the data information in real time, a display module (LCD1602 display screen) can be used to display the communication data.The test panel is installed on the test bench. The test bench is connected to the machine part through a connector. The machine part (test machine part, smoke detector) is powered by the power input module, voltage stabilization module, CAN bus address selection module, CAN bus debugging module, discrete signal input module, relay load module, signal voltage conversion module and main control module. Test signals and controls are input, communication, control and signal transmission between the test bench and the machine part are carried out, whether the machine part performs corresponding drives is checked, the functions of the machine part are verified and fault detection is carried out to ensure its normal use.

[0031] A plurality of connectors 12 are installed on the test panel 1. The connectors 12 include a nine-pin CAN bus connector 13, a fifteen-pin aviation connector 14 and a twenty-five-pin general connector 15. The nine-pin CAN bus connector 13 is connected to the CAN bus debugging module 5. The fifteen-pin aviation connector 14 and the twenty-five-pin general connector 15 are connected to the main control module 11. Installing a plurality of connectors on the test panel 1 facilitates connecting the test bench to the machine part and facilitates signal transmission for testing.

[0032] The LED indication module 6 includes a plurality of indicator lights 16. The indicator lights 16 include nine indicator lights indicating relay actions and two indicator lights indicating the functions of the machine part. The indicator lights are installed on the test panel to visually and clearly display the status of relay actions and discrete output signals. An LED lamp is connected to the output port, and by observing the on and off of the LED, it is judged whether the relay is working normally and whether the discrete output signal is normal.

[0033] A plurality of toggle switches 17 are also installed on the test panel 1. The toggle switches 17 include a three-position TEST SELECT status selection switch, a four-position COMMON SELECT selection switch and a twelve-position TP test point selection switch. The toggle switches 17 are connected to the main control module 11. Facilitating test selection through a plurality of toggle switches for corresponding functional tests.

[0034] The power input module 2 includes a double-pole double-throw switch S2. The double-pole double-throw switch S2 is used to achieve voltage inversion for power inversion testing.

[0035] Working process:

[0036] The working principle of the present utility model is as follows: The power input module includes a power access hole provided on the test panel, and a 28VDC power supply (provided by an external regulated power supply (HS-SB-0003)) is accessed. The voltage regulation module 3 includes chips LM317 and LM7805. After the power supply passes through chips LM317 and LM7805, 12VDC and 5VDC are respectively output to supply power to the CAN bus debugging module and the main control module. During the test, two discrete signals need to be simulated through the discrete signal input module. One discrete signal controls the self-check of the smoke detector, and one discrete signal controls the disabling and enabling of the audio alarm. The discrete signal input module includes a switch S21, and the switch S21 shorts two input pins together to realize the audio alarm. During the test, the output load of the relay is simulated through the relay load module for testing. The CAN bus debugging module includes chips MCP2551ESN and ADUM1201AR. The chip MCP2551ESN is used as the communication transceiver of the CAN bus, and the ADUM1201AR chip is selected as the signal isolation chip. And during the test, an independent 5VDC needs to be input to supply power to the communication transceiver of the CAN bus debugging module. The independent 5V is provided by a regulated power supply (HS-SB-0075), and a 5VDC power supply (provided by the external regulated power supply (HS-SB-0075)) is accessed through the power access hole. The MCU of the main control module uses the STM32F407 single-chip microcomputer, with a working voltage of 3.3V and a pin output voltage of 3.3V. It is necessary to perform level conversion through the signal voltage conversion module to achieve CAN bus communication. By inputting test signals and controls through each module, communication, control, and signal transmission between the test bench and the machine parts are carried out to check whether the machine parts perform corresponding drives, verify the functions of the machine parts, and perform fault detection.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model and are not restrictive. Although the present utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present utility model.

Claims

1. An aircraft smoke detector test bench, characterized in that: The aircraft smoke detector test bench comprises a test panel (1), a power input module (2), a voltage regulator module (3), a CAN bus address selection module (4), a CAN bus debugging module (5), an LED indication module (6), a discrete signal input module (7), a relay load module (8), a signal voltage conversion module (9), a display module (10) and a main control module (11); the power input module (2) is connected to the voltage regulator module (3); the voltage regulator module (3) is connected to the CAN bus debugging module (5) and the main control module (11); the CAN bus debugging module (5) is connected to the main control module (11) via the signal voltage conversion module (9); the LED indication module (6), the discrete signal input module (7), the relay load module (8) and the display module (10) are all connected to the main control module (11); and a connector (12) and a band switch (17) are installed on the test panel (1).

2. The aircraft smoke detector test bench according to claim 1, characterized in that: The test panel (1) is provided with a plurality of connectors (12), wherein the connectors (12) include a nine-pin CAN bus connector (13), a fifteen-pin aviation connector (14) and a twenty-five-pin universal connector (15), wherein the nine-pin CAN bus connector (13) is connected to a CAN bus debugging module (5), and the fifteen-pin aviation connector (14) and the twenty-five-pin universal connector (15) are connected to a main control module (11).

3. The aircraft smoke detector test bench according to claim 1, characterized in that: The LED indication module (6) comprises a plurality of indicator lights (16), wherein the indicator lights (16) comprise nine indicator lights for indicating relay action and two indicator lights for indicating component functions.

4. The aircraft smoke detector test bench according to claim 1, characterized in that: The test panel (1) is also equipped with a plurality of band switches (17), the band switches (17) comprising a three-speed TEST SELECT state selection switch, a four-speed COMMON SELECT selection switch and a twelve-speed TP test point selection switch, and the band switches (17) are connected to the main control module (11).

5. The aircraft smoke detector test bench according to claim 1, characterized in that: The MCU of the main control module (11) uses an STM32F407 single-chip microcomputer.

6. The aircraft smoke detector test bench according to claim 1, characterized in that: The power input module (2) comprises a double-pole double-throw switch S2.

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