An interactive emergency landing gear switch detection system

Abstract

The present invention provides an interactive emergency landing gear switch detection system, comprising a microprocessor module, a relay module, a band switch group, and a touch screen module. Through the multiplexing technology of relays, the same relay module can be used to complete the switching functions of different circuits, that is, it can complete whether the conductivity of the emergency landing gear switch to be tested meets the requirements, and can also complete the insulation resistance test of the preset points on three groups of micro switches, which greatly reduces the size of the detection system and is easy to carry; at the same time, the detection system of the present invention realizes an interactive operation mode through the touch screen module, reduces the labor intensity of workers and inspectors, is easy to operate, runs reliably and stably, and reduces human errors.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation equipment maintenance, and in particular relates to an interactive emergency landing gear switch detection system. Background Art

[0002] The emergency landing gear switch installed on the aircraft is used to lower the landing gear door and the aircraft landing gear when the aircraft cannot lower the landing gear during normal landing to ensure the safe landing of the aircraft. Its repair and inspection is a very important part of aircraft overhaul.

[0003] When an aviation repair company overhauls this product for a military aircraft, first of all, Figure 1 As shown, it is necessary to test the on and off states of the three sets of switches inside the emergency landing gear switch (hereinafter referred to as the "product") when the handle on the emergency landing gear switch is in the following five states (original state, pull the handle out to the stop state, rotate the handle 90° counterclockwise to pull it out to the stop state, press the handle state, and rotate the handle 90° clockwise to press the state). The conductivity should meet the technical requirements shown in Table 1. Secondly, it is necessary to test the insulation resistance between the power-on circuit (point C, point D, point E, point F, point G) of the product and the product shell, which should meet the requirement of not more than 20MΩ. Finally, it is necessary to test whether a set of 4.5V light guide plates on the product are lit.

[0004] Table 1 Three groups of switch states when the handle is in five states

[0005]

[0006]

[0007] At present, the testing of products by aviation maintenance enterprises is still limited to the manual multimeter circuit testing method. The current process testing methods are as follows:

[0008] First, according to the requirements of "five states of the handle" in Table 1, put the product into five states respectively through the conversion handle on the product, and use the conduction gear of a digital multimeter to manually test the on and off states of the three groups of micro switches inside the product in five states (a total of 15 on and off states). The values ​​should meet the requirements of "three groups of micro switches" in Table 1.

[0009] Secondly, use the two test leads of the insulation resistance meter to measure the insulation resistance between the product's points C, D, E, F and G and the shell, which should be no less than 20MΩ.

[0010] Finally, a 4.5V DC power supply is needed to power pins A and B of the product to check the performance of the product's light guide plate.

[0011] It should be noted that the testing of products by aviation maintenance companies often requires two people to check, one worker is responsible for operation, and the other is an inspector for supervision. When the worker clicks a certain point with a test lead, the inspector also needs to determine whether to click a certain point. It takes at least 15 manual tests to complete the on-off test of the product in five states. Each point needs to be measured multiple times with two test leads of a multimeter. Each test must be compared with the test results of the process. The pin numbers in the aviation plug are not easy to identify, and the distance between the pins is close. In addition, factors such as the slipping of the test leads and repeated tests make it very easy for workers or inspectors to miss or make mistakes, resulting in human errors. Therefore, how to complete the interactive automatic test of the switch status of the product in five states, reduce the labor intensity of workers and inspectors, and allow workers and inspectors to focus more on testing the performance of the product itself, reducing the occurrence of human errors is one of the technical problems to be solved by the present invention.

[0012] Secondly, the product insulation resistance test requires the use of a test lead of an insulation resistance meter to identify points C, D, E, F, and G from the aviation plug. The aviation plug is small, the internal pins are not clearly marked, and workers who are not skilled in operation often waste time on identification. At the same time, when the worker clicks to a certain point for testing, the inspector also needs to determine whether to click a certain point in order to record the test value, which invisibly wastes test time. Therefore, how to reduce the time for workers and inspectors to identify test points from the aviation plug without repeatedly determining the test points is the second technical problem to be solved by the present invention.

[0013] Finally, the light guide plate test on the product requires manually passing a 4.5V power supply between pins A and B in the product's aviation plug. Before each test, the power supply and the adapter wire must be prepared, which virtually increases the test preparation time. How to integrate the power supply into the interactive device is the third technical problem to be solved by the present invention. Summary of the invention

[0014] To solve the above problems, the present invention provides an interactive emergency landing gear switch detection system. Through the multiplexing technology of relays, the same relay module can be used to complete the switching functions of different circuits, which greatly reduces the size of the detection system and reduces human errors.

[0015] An interactive emergency landing gear switch detection system, when the handle of the emergency landing gear switch to be tested is in different preset states, three groups of micro switches in the emergency landing gear switch to be tested correspond to different theoretical on-off states, the detection system comprises a microprocessor module, a relay module, a 2-knife 6-speed band switch, and a touch screen module, wherein the microprocessor module stores the corresponding relationship between the preset state and the theoretical on-off state;

[0016] The touch screen module is used to set the preset state of the handle; the relay module is used to collect the actual on-off state of the three groups of micro switches when the handle is in different preset states, and the microprocessor module determines whether the conductivity of the emergency landing gear switch to be tested meets the requirements according to whether the actual on-off state is the same as the theoretical on-off state, and displays the judgment result through the touch screen module;

[0017] The relay module is also used to transfer the preset points on the three groups of micro switches to the first level of the 2-blade 6-speed band switch, and then the first level of the gear leads each preset point to the insulation resistance test hole for insulation resistance testing; the second level of the 2-blade 6-speed band switch is used to synchronize the preset points currently undergoing insulation resistance testing to the microprocessor module, and then the microprocessor module sends the test results to the touch screen module for display.

[0018] Further, the preset points are 5 and are respectively defined as point C, point D, point E, point F and point G, and the relay module includes relays K1 to K5;

[0019] The test circuit for the continuity of the emergency landing gear switch to be tested is:

[0020] Point C and point D are connected to the common contacts of relay K1 and relay K2 respectively, and then connected to the 3.3V power supply through the normally closed contacts of relay K1 and relay K2 respectively; Point E, point F and point G are connected to the common contacts of relay K4, relay K5 and relay K3 respectively, and then connected to the programmable I / O ports PA1, PA4 and PA6 of the microprocessor module through the normally closed contacts of relay K4, relay K5 and relay K3 respectively, wherein the programmable I / O ports PA1, PA4 and PA6 are set to a high-level effective receiving mode, and at the same time, the control ends of relays K1 to K6 are connected to the programmable I / O ports PB6, PB7, PB8, PB9, PB10 and PB11 of the microprocessor module respectively, and the microprocessor module is connected to the touch screen module through a dedicated flat cable; the microprocessor module monitors the actual on-off state of the three groups of micro switches in real time through PA1, PA4 and PA6, and judges whether the conductivity of the emergency landing gear switch to be tested meets the requirements according to whether the actual on-off state is the same as the theoretical on-off state.

[0021] Further, the preset points are 5 and are respectively defined as point C, point D, point E, point F and point G, and the relay module includes relays K1 to K5;

[0022] The test circuit for the insulation resistance of the emergency landing gear switch to be tested is:

[0023] Point C, point D, point E, point F and point G are connected to the common contacts of relay K1, relay K2, relay K4, relay K5 and relay K3 respectively. At the same time, the normally open contacts of relay K1, relay K2, relay K4, relay K5 and relay K3 are connected to the 2nd, 3rd, 5th, 4th and 6th gears of the 2-blade 6-gear band switch on the first layer respectively. The common point of the first layer is connected to the insulation resistance test hole on the measuring hole panel, and then tested by an external insulation resistance meter; the corresponding 2nd, 3rd, 4th, 5th and 6th gears of the 2nd layer of the 2-blade 6-gear band switch are connected to the programmable I / O ports PA8, PA7, PA0, PA6 and PA14 of the microprocessor module respectively, and the common point of the second layer is connected to the 3.3V signal source; the microprocessor module is connected to the touch screen module through a dedicated cable. At the same time, the shell of the emergency landing gear switch to be tested is connected to the insulation resistance test hole ground of the measuring hole panel through a wire;

[0024] When the insulation resistance test is performed, the microprocessor module controls relays K1 to K5 to be energized. At this time, point C, point D, point E, point F, and point G are respectively connected to the common contacts of relay K1, relay K2, relay K4, relay K5, and relay K3, and then enter the 1st layer 2, 3, 4, 5, and 6 of the 2-blade 6-speed band switch through their normally open contacts, and enter the insulation resistance test hole on the measuring hole panel through the common point of the 1st layer of the 2-blade 6-speed band switch; at the same time, the 3.3V signal source is connected to the common contact of the 2nd layer of the 2-blade 6-speed band switch, and the 2nd layer contact of the 2-blade 6-speed band switch is synchronized with the 1st layer contact of the 2-blade 6-speed band switch, so that the preset point of the current insulation resistance test is introduced into the programmable I / O port PA8, PA7, PA0, PA14 or PA6 corresponding to the microprocessor module.

[0025] Furthermore, the microprocessor module is also used to perform an on-off test on the light guide plate of the emergency landing gear switch to be tested through the relay module to test whether the on and off functions of the light guide plate are normal.

[0026] Furthermore, the test point A of the light guide plate is connected to the common contact of one of the relays K6 in the relay module, the normally open contact of relay K6 is connected to the positive pole of the 4.5V power supply, and the other test point B of the light guide plate is connected to the negative pole of the 4.5V power supply. The control end of relay K6 is connected to the programmable I / O port PB11 of the microprocessor module. The microprocessor module can control the conduction and closing of the light guide plate by controlling the attraction of relay K6.

[0027] Further, an interactive emergency landing gear switch detection system further includes a 12V power module and a secondary power module;

[0028] The 12V power supply module is used to power the microprocessor module; the secondary power supply module is used to convert the 12V power provided by the 12V power supply module into 3.3V, 4.5V and 5V power supplies respectively, wherein the 5V power supply is used to power the relay module, the 4.5V power supply is used to power the light guide plate of the emergency landing gear switch to be tested, and the 3.3V power supply is used to provide high and low level signals to the microprocessor module through a 2-blade 6-speed band switch.

[0029] Beneficial effects:

[0030] 1. The present invention provides an interactive emergency landing gear switch detection system. Through the multiplexing technology of relays, the same relay module can be used to complete the switching function of different circuits, that is, it can not only complete whether the conductivity of the emergency landing gear switch to be tested meets the requirements, but also complete the insulation resistance test of the preset points on the three groups of micro switches, which greatly reduces the size of the detection system and is easy to carry; at the same time, the detection system of the present invention realizes an interactive operation mode through a touch screen module, reduces the labor intensity of workers and inspectors, is easy to operate, runs reliably and stably, and reduces human errors.

[0031] 2. The present invention provides an interactive emergency landing gear switch detection system, which uses a microprocessor to store five states of three groups of switches in an emergency landing gear switch to be tested, process test content, etc. in the microprocessor, and can complete interactive automatic testing of the switch states of the emergency landing gear switch to be tested under multiple preset states through a dedicated test circuit containing 6 relays and controlling the general I / O port of the microprocessor; that is, the present invention only uses 5 relays, dedicated wires, a 3.3V power supply and a microcontroller to form a test circuit to complete the test of 15 states of the emergency landing gear switch to be tested, which greatly reduces the labor intensity of workers and inspectors, allowing workers and inspectors to use more energy on testing the performance of the emergency landing gear switch to be tested, thereby reducing the occurrence of human errors.

[0032] 3. The present invention provides an interactive emergency landing gear switch detection system, which introduces the test point of the emergency landing gear switch to be tested into the test panel fixing hole of the detection system through a special test wire, 6 relays and a band switch, and then performs the test through an external insulation resistance meter; when the band switch is rotated, the first layer of the band switch introduces the test point into the insulation resistance test hole of the measuring hole panel, and the 3.3V signal provided by the second layer of the band switch will inform the microprocessor module operator of the point currently undergoing the insulation resistance test, and the microprocessor displays the test point and the next operation to be performed by the band switch through the screen of the touch screen module; that is, the present invention only adopts a test circuit composed of 5 relays, a special connection line, a 2-knife 6-speed band switch and a microcontroller, and can complete the insulation resistance test of the product in an interactive form, so that workers and inspectors no longer need to identify the test points from the aviation plug, which greatly improves the test efficiency.

[0033] 4. The present invention provides an interactive emergency landing gear switch detection system, which has an internal integrated 4.5V power supply, and is input to the light guide plate of the emergency landing gear switch to be tested through a relay control input. That is to say, the present invention can complete the test of the on / off function of the light guide plate of the emergency landing gear switch to be tested through a test circuit composed of a relay, a 4.5V power supply and a power supply connecting wire, which can reduce the preparation time before the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is the schematic diagram of the internal structure of the emergency landing gear switch;

[0035] Figure 2 A device hardware cross-link diagram of an interactive emergency landing gear switch detection system provided by the present invention;

[0036] Figure 3 A test main program diagram of an interactive emergency landing gear switch detection system provided by the present invention;

[0037] Figure 4 A switch performance test flow chart of an interactive emergency landing gear switch detection system provided by the present invention;

[0038] Figure 5 An insulation resistance test flow chart of an interactive emergency landing gear switch detection system provided by the present invention;

[0039] Figure 6 A schematic diagram of a device connection circuit of an interactive emergency landing gear switch detection system provided by the present invention;

[0040] Figure 7 The program effect diagram of the performance test touch screen module provided by the present invention;

[0041] Figure 8 This is a program design diagram for the insulation resistance touch screen provided by the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0043] like Figure 2 As shown, an interactive emergency landing gear switch detection system, when the handle of the emergency landing gear switch to be tested is in different preset states, three groups of micro switches in the emergency landing gear switch to be tested correspond to different theoretical on-off states, the equipment hardware of the detection system includes an embedded microprocessor module, a relay module, a 2-blade 6-speed band switch, a touch screen module, a 12V power supply module and a secondary power supply module, wherein the microprocessor module stores the correspondence between the preset state and the theoretical on-off state.

[0044] The touch screen module is used to set the preset state of the handle; the relay module is used to collect the actual on-off states of the three groups of micro switches when the handle is in different preset states, and the microprocessor module determines whether the conductivity of the emergency landing gear switch to be tested meets the requirements based on whether the actual on-off state is the same as the theoretical on-off state, and displays the judgment result through the touch screen module.

[0045] The relay module is also used to transfer the preset points on the three groups of micro switches to the first level of the 2-blade 6-speed band switch, and then the first level of the gear leads each preset point to the insulation resistance test hole for insulation resistance testing; the second level of the 2-blade 6-speed band switch is used to synchronize the preset points currently undergoing insulation resistance testing to the microprocessor module, and then the microprocessor module sends the test results to the touch screen module for display.

[0046] The 12V power supply module is used to power the microprocessor module; the secondary power supply module is used to convert the 12V power provided by the 12V power supply module into 3.3V, 4.5V and 5V power supplies respectively, wherein the 5V power supply is used to power the relay module, the 4.5V power supply is used to power the light guide plate of the emergency landing gear switch to be tested, and the 3.3V power supply is used to provide high and low level signals to the microprocessor module through a 2-blade 6-speed band switch.

[0047] It should be noted that the interactive emergency landing gear switch detection system provided by the present invention has its equipment software developed based on a microcontroller, including touch screen interactive program interface design, I / O port working status program design, Figure 3 The test main program design software design shown in Figure 4 The performance test subroutine software design shown in Figure 5The insulation resistance subroutine software design and the light guide plate subroutine software design are shown.

[0048] Furthermore, in response to the technical problem to be solved, the present invention provides one of the circuit implementation methods of the interactive emergency landing gear switch detection system, and finally determines to use a microcontroller to control 6 relays, and switch 6 lines through a 2-blade 6-speed band switch to complete the product performance test, insulation resistance circuit switching and light guide plate power supply switching function circuit design.

[0049] It should be noted that the microcontroller module should have at least 64KB SRAM, 512KB FLASH, 2 basic timers, 4 general timers, 1 SDIO interface, 1 FSMC interface, 112 general I / O ports, and 1 JTAG interface;

[0050] The power module should use linear DC regulated power supply with three specifications: 3.3V, 5V and 12V;

[0051] The relay module adopts a 6-way optocoupler isolation relay module. The control end has a 19-wire interface, "DC+", "DC-", "XCOM" and "X1~X6", high-level trigger; "NO1~NO6" relay normally open interface, the relay is suspended before it is energized, and short-circuited with COM after it is energized.

[0052] The touch screen module adopts high resolution 800*480, comes with its own driver, no external driver is required, the microcontroller can be used directly, supports 8 / 9 / 12 / 16-bit 8080 parallel port connection, and supports backlight brightness control;

[0053] The power supply connection relationship is as follows:

[0054] The 12V power supply module supplies power to the microprocessor module, and the 12V power supply is converted into 3.3V, 4.5V and 5V power supplies through the secondary power supply. The 5V power supply module supplies power to 6 relays, the 4.5V power supply supplies power to the light guide plate of the emergency landing gear switch to be tested, and the 3.3V power supply provides signals to the controller through a 2-knife 6-speed band switch.

[0055] The present invention uses 6 relays K1-K6 and a group of 2-knife 6-speed band switches to complete the design of the emergency landing gear switch performance test circuit, the insulation resistance test circuit and the light guide plate power supply circuit.

[0056] The performance test circuit of the emergency landing gear switch to be tested is as follows: Figure 6 As shown:

[0057] Specifically, this part of the hardware consists of a test cable for the emergency landing gear switch to be tested, 5 relays K1 to K5, a 3.3V power supply, 3 programmable I / O ports of the microprocessor, and a touch screen module. The emergency landing gear switch to be tested and points C, D, E, F, and G of the three groups of switches to be tested are connected to the 3.3V power supply and the common contacts of the relay module through 5 wires. The specific connection relationship is that points C and D connected to the emergency landing gear switch to be tested are connected to the common contacts of relay K1 and relay K2 through wires, and are connected to the 3.3V power supply through the normally closed contacts of relay K1 and relay K2. Points E, F and G connected to the emergency landing gear switch to be tested are connected to the common contacts of relays K4, K5 and K3 respectively through wires, and are connected to the programmable I / O ports PA1, PA4 and PA6 of the microprocessor respectively through the normally closed contacts of relays K4, K5 and K3, wherein PA1, PA4 and PA6 need to be set to a high-level valid receiving mode, with 3.3V as a high level and 0V as a low level. Relays K1 to K6 are controlled by the programmable I / O ports PB6, PB7, PB8, PB9, PB10 and PB11 of the microprocessor. At the same time, the microprocessor is connected to the touch screen module through a dedicated cable.

[0058] The principle of the test is: Figure 7 As shown, the microprocessor stores the five on-off states of the three groups of micro switches in Table 1 into the microprocessor, and designs the following Figure 7 The human-computer interaction interface shown. On the basis of the above, the 3.3V power supply is connected to the C point and the D point of the emergency landing gear switch to be tested through wires. The microprocessor monitors the actual on-off state of the three groups of micro switches in real time through the programmable PA1, PA4 and PA6. Among them, if a micro switch is turned on, its corresponding programmable I / O port will be connected to the 3.3V high level and enter the effective receiving mode to determine the actual on-off state of the micro switch; when the emergency landing gear switch to be tested performs state 1 operation according to Table 1, the interactive device will display the operation information on the current interactive interface. When the first step is clicked, the microprocessor will compare the monitored PA1, PA4 and PA6 states with the states stored in the microprocessor and output the judgment result. The test can only be exited after all the tests in the fifth step are completed.

[0059] It can be seen that through Figure 7 The touch module program renderings shown allow workers and inspectors to focus more on the performance of the emergency landing gear switch to be tested. At the same time, this design has five parts of testing. If any step fails the test, it can be seen on the interface, preventing the risk of missed tests or errors. By introducing a microprocessor and a touch screen, the process operation content and technical requirements are displayed on the touch screen, reducing the time for reviewing the process, realizing the function of interactive automatic testing, and reducing the occurrence of human errors.

[0060] Product insulation resistance test circuit Figure 6 As shown:

[0061] In order to reduce the number of relays used, the circuit designed in this part still uses the 5 relays and transfer cables of the performance test circuit part, and introduces a 2-knife 6-speed band switch. The hardware connection relationship is shown in the figure. Points C, D, E, F, and G connected to the product are connected to the common contacts of relays K1, K2, K4, K5, and K3 through wires. The normally open contacts of relays K1, K2, K4, K5, and K3 are connected to the 2nd, 3rd, 5th, 4th, and 6th gears of the 2nd layer of the 6-speed band switch, and the common point of the 1st layer is connected to the insulation resistance test jack on the measuring hole panel; the corresponding 2nd, 3rd, 4th, 5th, and 6th gears of the 2nd layer of the 6-speed band switch are connected to the programmable control I / O ports PA8, PA7, PA0, PA6, and PA14 of the microprocessor, where these ports are initialized as receiving ports, the default is 0, and at the same time, the common point of the 2nd layer is connected to the 3.3V signal source. The microprocessor is connected to the touch screen through a dedicated flat cable, and the housing of the emergency landing gear switch to be tested is connected to the insulation resistance test hole ground of the measuring hole panel through a wire.

[0062] The principle of the test is: when the interactive device performs an insulation resistance test, the microprocessor controls relays K1 to K5 to be energized. At this time, point C, point D, point E, point F, and point G connected to the emergency landing gear switch to be tested are respectively connected to the common contacts of relays K1, relay K2, relay K4, relay K5, and relay K3 through wires, and then enter the 1st layer 2, 3, 4, 5, and 6th gears of the 2-knife 6-gear band switch through their normally open contacts, and enter the insulation resistance test hole on the measurement hole panel through the common point of the 2-knife 6-gear band switch; at the same time, the 3.3V signal source is connected to the common contact of the 2nd layer of the 2-knife 6-gear band switch, and the 2nd of the 2-knife 6-gear band switch is The layer contact is synchronized with the first layer contact of the 2-pole 6-speed band switch in the same gear position, and is introduced into the programmable I / O ports PA8, PA7, PA0, PA14, and PA6 of the microprocessor respectively. The function of the 2-layer contact of the 2-pole 6-speed band switch is that when the 1st layer of the 2-pole 6-speed band switch is in the 2nd gear position, the 1st layer 2nd gear of the 2-pole 6-speed band switch can connect the C point of the emergency landing gear switch to be tested to the insulation resistance test hole of the measuring hole panel to be measured by the insulation resistance tester. At the same time, the 2nd layer of the 2-pole 6-speed band switch is synchronized with the 2nd gear position to introduce the 3.3V signal into PA8 of the microprocessor. At this time, PA8 is high level. At this time, the microprocessor can determine that the point C is being tested, such as Figure 8As shown, the screen can be touched to prompt "Workers can judge whether the insulation resistance of point C is qualified by observing the test value of the external insulation resistance meter". At the same time, the screen will prompt the next action and test point of the band switch. By analogy, other gear tests can be completed, such as Figure 8 As shown. So far, the interactive measurement of product insulation resistance is completed. In order to prevent the risk of missed measurement, the present invention can also add a gear monitoring program, that is, each receiving port must receive 1 before exiting the test, otherwise, it will prompt that there is a missed measurement point.

[0063] Power connection and principle of the light guide plate test of the emergency landing gear switch to be tested:

[0064] Point A on the light guide plate of the emergency landing gear switch to be tested is connected to the common contact of relay K6 through a wire, the normally open contact of relay K6 is connected to the positive pole of the secondary power supply 4.5V, and point B of the light guide plate is connected to the negative pole of the secondary power supply through a wire. The control end of relay K6 is connected to the programmable I / O port PB11 of the microprocessor module, and the microprocessor controls the contact of relay K6 to control the on and off of the light guide plate.

[0065] Furthermore, the microcontroller controls the relays and the connection relationships of the pathways are summarized as follows:

[0066] like Figure 6 As shown, the high level trigger ports of the six relays are respectively connected to the six I / O ports PB6, PB7, PB8, PB9, PB10 and PB11 of the microcontroller. The six I / O ports are all set as output ports and initialized to 0. When at a high level, the corresponding relays are activated.

[0067] When the performance test of the emergency landing gear switch to be tested is carried out, relays K1 to K6 do not operate, that is, PB6, PB7, PB8, PB9, PB10 and PB11 are all 0; the emergency landing gear switch to be tested is tested according to the performance test circuit; PA1, PA4 and PA6 are initialized as receiving ports with an initial value of 0, and these three paths are used as detection ports for performance testing. When the microprocessor receives 3.3V, it proves that this path is connected, otherwise it is disconnected.

[0068] When the insulation resistance test of the emergency landing gear switch is being conducted, relays K1 to K5 are actuated, i.e. PB6, PB7, PB8, PB9, and PB10 are 1. At this time, the circuit is switched according to the insulation resistance test circuit and the corresponding operation is completed according to the screen prompts;

[0069] When testing the light guide plate, relay K6 is activated, that is, PB11 is 1, and other relays are not activated. Switch the 4.5V power supply to the light guide plate, and then check the light guide plate as required.

[0070] It can be seen that the present invention introduces the test point of the emergency landing gear switch to be tested into the interactive emergency landing gear switch detection system by making a special connection cable. The microprocessor used in the detection system stores the five states of the three groups of switches in the emergency landing gear switch to be tested, the test content of the process, etc. in the microprocessor. Through the special test circuit containing 6 relays designed by the present invention and the control of the general I / O port of the microprocessor, the interactive automatic test of the switch state of the emergency landing gear switch to be tested under five preset states can be completed, which greatly reduces the labor intensity of workers and inspectors, allowing workers and inspectors to spend more energy on the test of the performance of the product itself, reducing the occurrence of human errors.

[0071] The present invention designs a special test circuit composed of a special test wire, 6 relays, a 2-knife 6-speed band switch and a microprocessor. The test point of the emergency landing gear switch to be tested is introduced into the test panel fixing hole of the detection system through the special test wire, 6 relays and the band switch, and tested by an external insulation resistance meter. When the band switch is rotated, the first layer of the band switch introduces the test point into the panel fixing hole, and the 3.3V signal provided by the second layer of the band switch 1 will notify the microprocessor module operator of the point where the insulation resistance test is being performed. The microprocessor displays the point being tested and the next operation to be performed by the band switch through the screen of the touch screen module. Workers and inspectors no longer need to identify the test points from the aviation plug, which greatly improves the test efficiency.

[0072] The detection system integrates a 4.5V power supply, which is input to the light guide plate of the emergency landing gear switch to be tested through a relay control, which can reduce the preparation time before testing.

[0073] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may certainly make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An interactive emergency landing gear switch detection system, wherein when the handle of the emergency landing gear switch to be tested is in different preset states, three groups of micro switches in the emergency landing gear switch to be tested correspond to different theoretical on-off states, characterized in that: The detection system includes a microprocessor module, a relay module, a 2-blade 6-speed band switch, and a touch screen module, wherein the microprocessor module stores the corresponding relationship between the preset state and the theoretical on-off state; The touch screen module is used to set the preset state of the handle; the relay module is used to collect the actual on-off state of the three groups of micro switches when the handle is in different preset states, and the microprocessor module determines whether the conductivity of the emergency landing gear switch to be tested meets the requirements according to whether the actual on-off state is the same as the theoretical on-off state, and displays the judgment result through the touch screen module; The relay module is also used to transfer the preset points on the three groups of micro switches to the first level of the 2-pole 6-level band switch, and then the first level leads each preset point to the insulation resistance test hole for insulation resistance testing; the second level of the 2-pole 6-level band switch is used to synchronize the preset points currently undergoing insulation resistance testing to the microprocessor module, and then the microprocessor module sends the test results to the touch screen module for display; the preset points are 5, and are respectively defined as point C, point D, point E, point F and point G, and the relay module includes relays K1 to K5; The test circuit for the continuity of the emergency landing gear switch to be tested is: Point C and point D are connected to the common contacts of relay K1 and relay K2 respectively, and then connected to the 3.3V power supply through the normally closed contacts of relay K1 and relay K2 respectively; Point E, point F and point G are connected to the common contacts of relay K4, relay K5 and relay K3 respectively, and then connected to the programmable I / O ports PA1, PA4 and PA6 of the microprocessor module through the normally closed contacts of relay K4, relay K5 and relay K3 respectively, wherein the programmable I / O ports PA1, PA4 and PA6 are set to a high-level effective receiving mode, and at the same time, the control ends of relays K1 to K6 are connected to the programmable I / O ports PB6, PB7, PB8, PB9, PB10 and PB11 of the microprocessor module respectively, and the microprocessor module is connected to the touch screen module through a dedicated flat cable; the microprocessor module monitors the actual on-off state of the three groups of micro switches in real time through PA1, PA4 and PA6, and judges whether the conductivity of the emergency landing gear switch to be tested meets the requirements according to whether the actual on-off state is the same as the theoretical on-off state; The test circuit for the insulation resistance of the emergency landing gear switch to be tested is: Point C, point D, point E, point F and point G are connected to the common contacts of relay K1, relay K2, relay K4, relay K5 and relay K3 respectively. At the same time, the normally open contacts of relay K1, relay K2, relay K4, relay K5 and relay K3 are connected to the 2nd, 3rd, 5th, 4th and 6th gears of the 2-blade 6-gear band switch on the first layer respectively. The common point of the first layer is connected to the insulation resistance test hole on the measuring hole panel, and then tested by an external insulation resistance meter; the corresponding 2nd, 3rd, 4th, 5th and 6th gears of the 2nd layer of the 2-blade 6-gear band switch are connected to the programmable I / O ports PA8, PA7, PA0, PA6 and PA14 of the microprocessor module respectively, and the common point of the second layer is connected to the 3.3V signal source; the microprocessor module is connected to the touch screen module through a dedicated cable. At the same time, the shell of the emergency landing gear switch to be tested is connected to the insulation resistance test hole ground of the measuring hole panel through a wire; When the insulation resistance test is performed, the microprocessor module controls relays K1 to K5 to be energized. At this time, point C, point D, point E, point F, and point G are respectively connected to the common contacts of relay K1, relay K2, relay K4, relay K5, and relay K3, and then enter the 1st layer 2, 3, 4, 5, and 6 of the 2-blade 6-speed band switch through their normally open contacts, and enter the insulation resistance test hole on the measuring hole panel through the common point of the 1st layer of the 2-blade 6-speed band switch; at the same time, the 3.3V signal source is connected to the common contact of the 2nd layer of the 2-blade 6-speed band switch, and the 2nd layer contact of the 2-blade 6-speed band switch is synchronized with the 1st layer contact of the 2-blade 6-speed band switch, so that the preset point of the current insulation resistance test is introduced into the programmable I / O port PA8, PA7, PA0, PA14 or PA6 corresponding to the microprocessor module.

2. An interactive emergency landing gear switch detection system as claimed in claim 1, characterized in that: The microprocessor module is also used to perform an on-off test on the light guide plate of the emergency landing gear switch to be tested through the relay module to test whether the on and off functions of the light guide plate are normal.

3. An interactive emergency landing gear switch detection system as claimed in claim 2, characterized in that: The point A to be tested of the light guide plate is connected to the common contact of one of the relays K6 in the relay module, the normally open contact of relay K6 is connected to the positive pole of the 4.5V power supply, and the other point B to be tested of the light guide plate is connected to the negative pole of the 4.5V power supply. The control end of relay K6 is connected to the programmable I / O port PB11 of the microprocessor module. The microprocessor module can control the on and off of the light guide plate by controlling the attraction of relay K6.

4. An interactive emergency landing gear switch detection system as claimed in claim 1, characterized in that: It also includes a 12V power module and a secondary power module; The 12V power supply module is used to power the microprocessor module; the secondary power supply module is used to convert the 12V power provided by the 12V power supply module into 3.3V, 4.5V and 5V power supplies respectively, wherein the 5V power supply is used to power the relay module, the 4.5V power supply is used to power the light guide plate of the emergency landing gear switch to be tested, and the 3.3V power supply is used to provide high and low level signals to the microprocessor module through a 2-blade 6-speed band switch.

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