A universal wheel load signal detection device

Abstract

The present application belongs to signal detection technology, and relates to a universal wheel load signal detection device. The device comprises a detection control box and replaceable switching cable; a logic conversion circuit and a self-checking circuit are arranged in the detection control box.

Description

TECHNICAL FIELD

[0001] The present application belongs to signal detection technology, and relates to a universal wheel load signal detection device. BACKGROUND

[0002] The wheel load signal of an airplane or a helicopter is provided by a wheel load switch, which is generally installed on a landing gear. Generally, the wheel load switch has two groups of contacts, each group of contacts has two states of being connected and disconnected, corresponding to the "air" and "ground" states of the airplane or the helicopter, but the definitions of the air-ground states of different models are different, as shown in Figure 1 Because the installation mode, triggering mode or electrical interface of the wheel load switches of landing gears of different models are different, and the principles of the wheel load switches of landing gears are different or the connection and disconnection logic is different, the connectors of the wheel load switch detection devices of a single model cannot match multiple models. Even if the connectors of the wheel load switch detection devices of different models match, the detection results may be wrong, or even completely opposite to the actual situation. Therefore, a wheel load signal detection device supporting multiple models is needed. SUMMARY

[0003] The purpose of the present application is that the air / ground state is often needed to be collected during the working process of each system of an airplane or a helicopter, the working states of each system of the airplane or the helicopter are different under different air / ground states, for example, the retraction and extension of the landing gear needs a correct air / ground signal, so the accuracy of the air / ground signal is very important. The air / ground signal is usually provided by the wheel load switch on the landing gear, and the wheel load switch is usually adjustable, so the state of the wheel load switch needs to be adjusted after the landing gear is assembled and before the test flight. The principles of the wheel load switches of different models are different, and currently there are contact type micro switches, approach type photoelectric switches and the like. Even if the same principle wheel load switch is used, the connection logic and the electrical interface are different due to the difference in the installation direction and the use method, so a universal wheel load signal detection device for multiple models is needed to assist in accurately and quickly adjusting the wheel load switches of different models.

[0004] TECHNICAL SCHEME

[0005] A universal wheel load signal detection device comprises a detection control box and a replaceable adapter cable.

[0006] A knob is installed on the detection control box, and the knob has three gears, namely, on, off and self-checking, and the three gears correspond to the power on, the power off and the self-checking function of the detection control box 1 respectively.

[0007] A logic conversion switch is installed on the detection control box, and the logic conversion switch has two gears, namely, logic A and logic B. The logic A and logic B gears correspond to the logic of a wheel load signal respectively, and when the wheel load signal test device is used for testing on different models, the logic conversion switch needs to be switched to the corresponding position.

[0008] Four light emitting diodes and four current limiting resistors are installed on the wheel load signal detection control box, the light emitting diodes are used to indicate the ground state of the wheel load signal,

[0009] The replaceable adapter cable is matched with the socket of the detection control box, and the second plug is matched with the wheel load switch.

[0010] The logic conversion circuit and the self-checking circuit are arranged in the detection control box.

[0011] The detection control box is also installed with four current limiting resistors; the current limiting resistors are used to protect the light emitting diodes.

[0012] The logic conversion circuit includes five solid state relays, ten current limiting resistors and three power supplies.

[0013] The solid state relay includes two driving ends and two load ends, the load end corresponds to the driving end, when the driving current is added to the driving end, the load end is connected;

[0014] When the driving current disappears, the load end is disconnected, the load characteristics of the solid state relay, and the current limiting resistor is added to the driving end to prevent the solid state relay from overloading;

[0015] When the wheel load switch connector is connected with the adapter cable connector, the positive and negative ends of the light emitting diode are turned on according to the on-off state of the wheel load switch.

[0016] When the logic conversion switch is switched to logic A, the driving power supply loads the driving current to the 1, 2 and 3, 4 ports of the 3rd and 4th solid state relays, the internal photoelectric coupler of the 3rd and 4th solid state relays works, the 5, 6 and 7, 8 ports of the 3rd and 4th solid state relays are connected, the F, A, C and E, B, D three contacts of the connector are in the on state respectively, which is used to detect the two groups of contacts of the wheel load switch, when the measured contacts are in the air state, two corresponding light emitting diodes are lit, and when the measured contacts are in the ground state, two corresponding light emitting diodes are lit.

[0017] When the logic conversion switch is switched to logic B, the driving power supply loads the driving current to the 1, 2 and 3, 4 ports of the 1st and 2nd solid state relays, the internal photoelectric coupler of the 1st and 2nd solid state relays works, the 5, 6 and 7, 8 ports of the 1st and 2nd solid state relays are connected, the F, A, C and E, B, D three contacts of the connector are in the on state respectively, which is used to detect the two groups of contacts of the wheel load switch; when the measured contacts are in the air state, two corresponding light emitting diodes are lit, and when the measured contacts are in the ground state, two corresponding light emitting diodes are lit.

[0018] For self-checking circuit, the power knob is turned to self-checking, the driving power supplies driving current to load 1, 2 and 3, 4 ports of the detection solid-state relay, the internal photo-coupler of the detection solid-state relay works, and the 5, 6 and 7, 8 ports of the detection solid-state relay are connected.

[0019] The knob is a three-position knob with two-way normally open contact with left rebound function. When the knob is in the middle position, the internal logic conversion circuit of the detection control box is in the off state. When the knob is in the right position, the internal logic conversion circuit of the detection control box is powered on and works. When the knob is in the left position, the internal self-checking circuit of the detection control box is powered on and works.

[0020] The self-checking position is the rebound position. After the test is completed, it automatically rebounds to the off position to prevent the knob from being mistakenly triggered to the self-checking position and causing power consumption.

[0021] The wheel load switch includes but is not limited to the ground switch, the tail wheel lock micro switch, and the landing gear up and down lock micro switch.

[0022] The beneficial effects are:

[0023] The use of logic conversion switch and logic conversion circuit can quickly switch the internal wiring logic of the wheel load signal detection device. According to the different installation directions of the wheel load switch, two opposite logic conversions can be realized. In combination with three replaceable adapter cables, the wheel load signal of more than 10 models of three series can be detected. In addition to the helicopter wheel load signal, the wheel load signal detection device can detect the wheel load signal of other types of aircraft, micro wheel lock signal and other types of micro switch signals by using different adapter cables, which is versatile. Compared with traditional relays, the use of solid-state relays to build the logic conversion circuit can improve the reliability by 3 times, reduce the space by 90%, reduce the weight by 95%, and reduce the cost by more than 60%. The use of the knob with rebound function can effectively reduce the loss of power caused by mistakenly touching the knob. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The figure is the logic diagram of the ground switch.

[0025] Figure 2 The figure is the detection principle diagram of the ground switch.

[0026] Figure 3 The figure is the structure diagram of the detection control box.

[0027] Figure 4 The figure is the structure diagram of the replaceable adapter cable.

[0028] Figure 5 The figure is the use example. DETAILED DESCRIPTION

[0029] The wheel load signal testing device includes a detection control box 1 and a replaceable adapter cable 2.

[0030] The knob 3 is installed on the wheel load signal detection control box 1, and the knob 3 has three gears, namely, on, off and self-checking, and the three gears correspond to the power on, power off and self-checking function of the detection control box 1 respectively.

[0031] The logic conversion switch 4 is installed on the wheel load signal detection control box 1, and the logic conversion switch 4 has two gears, namely, logic A and logic B. The logic conversion switch 4 can be used to switch the drive of the logic conversion circuit, and the logic A and logic B gears correspond to the logic of one wheel load signal respectively. When the wheel load signal testing device is used for testing different models, the logic conversion switch 4 needs to be switched to the corresponding position.

[0032] Four light emitting diodes 11 and four current limiting resistors 10 are installed on the wheel load signal detection control box 1, and the light emitting diodes 11 are used to indicate the space state of the wheel load signal, and the current limiting resistors 10 are used to protect the light emitting diodes 11.

[0033] The replaceable adapter cable 2 is matched with the wheel load signal testing device, the plug 5 of the replaceable adapter cable is matched with the socket 6 of the detection control box, and the plug 7 is matched with the wheel load switch 8. According to the number of models to be tested, multiple sets of adapter cables 2 are provided, and when the testing device is used for different models, the adapter cable 2 needs to be replaced.

[0034] The logic conversion circuit is arranged in the detection control box 1. Due to different installation methods, the space logic of the wheel load switch 8 with the same electrical interface may be opposite. The logic conversion circuit is responsible for switching the on-off logic of the wheel load switch under different models.

[0035] The self-checking circuit is arranged in the detection control box 1. Since it is necessary to confirm whether the detection control box 1 has a fault before testing the wheel load signal, the corresponding self-checking circuit is designed to perform self-checking on the function of the detection control box 1.

[0036] The shell of the wheel load signal detection device is provided with a red warning sign. Since the wheel load signal detection device needs to be used on an aircraft, the safety needs to be improved to prevent it from being left on the aircraft after use.

[0037] The connector 5 of the replaceable adapter cable and the connector 6 of the detection control box adopt J599 series composite material connectors, which can be quickly plugged and replaced. The connector 7 at the other end of the replaceable adapter cable is selected according to different models to be tested. When testing different models, the same detection control box 1 can be used, and only the logic conversion switch 4 needs to be switched and the replaceable adapter cable 2 needs to be replaced. In theory, as long as the appropriate connector 7 is selected, the wheel load signal detection device can be applied to the detection of two-group contact micro switches of all models.

[0038] The knob 3 is installed on the detection control box 1, and the wiring of the knob 3 is connected with the logic conversion circuit and the self-checking circuit. The knob 3 is a three-position knob with two-way normally open contact with left rebound function. When the knob 3 is in the middle gear (off gear), the internal logic conversion circuit of the detection control box 1 is in the off state. When the knob 3 is in the right gear (working gear), the internal logic conversion circuit of the detection control box 1 is powered on and works. When the knob 3 is in the left gear (self-checking gear), the internal self-checking circuit of the detection control box 1 is powered on and works. The self-checking gear set therein is the rebound gear. After the test is completed, it automatically rebounds to the off gear after being released, preventing the knob from being mistakenly triggered to the self-checking position to cause power consumption.

[0039] The logic conversion switch 4 is installed on the detection control box 1. When the knob 3 is in the right gear (working gear) or the left gear (self-checking gear), the logic conversion switch 4 can be switched to the logic A or logic B gear to switch the working state of the solid-state relays 9, 12, 13, 14, 15 in the logic conversion circuit.

[0040] The logic conversion circuit is composed of 5 solid state relays 9, 12, 13, 14, 15, 10 current limiting resistors 10 and 3 power supplies 16. The solid state relay is composed of 2 driving ends and 2 load ends, and the load end corresponds to the driving end. When the driving current is added to the driving end, the load end is connected, and when the driving current disappears, the load end is disconnected. The load characteristics of the solid state relay are that the current limiting resistor 10 is added to the driving end to prevent the solid state relays 9, 12, 13, 14, 15 from overloading. When the wheel load switch 8 connector is connected to the adapter cable connector 7, the positive and negative ends of the light emitting diode 11 are turned on according to the on-off state of the wheel load switch. When the logic conversion switch 4 is switched to logic A, the driving power supplies the 1, 2 and 3, 4 ports of the 3rd solid state relay 12 and the 4th solid state relay 13 with driving current, the internal optical coupling of the 3rd solid state relay 12 and the 4th solid state relay 13 works, the 5, 6 ports and the 7, 8 ports of the 3rd solid state relay 12 and the 4th solid state relay 13 are connected, the F, A, C and E, B, D three contacts of the connector 6 are in the on state respectively, and can be used to detect two groups of contacts of the wheel load switch 8. When the measured contact is in the air state, two corresponding light emitting diodes 11 are lit, and when the measured contact is in the ground state, two corresponding light emitting diodes 11 are lit. When the logic conversion switch 4 is switched to logic B, the driving power supplies the 1, 2 and 3, 4 ports of the 1st solid state relay 9 and the 2nd solid state relay 14 with driving current, the internal optical coupling of the 1st solid state relay 9 and the 2nd solid state relay 14 works, the 5, 6 ports and the 7, 8 ports of the 1st solid state relay 9 and the 2nd solid state relay 14 are connected, the F, A, C three contacts and the E, B, D three contacts of the connector 6 are in the on state respectively, and can be used to detect two groups of contacts of the wheel load switch 8. When the measured contact is in the air state, two corresponding light emitting diodes 11 are lit, and when the measured contact is in the ground state, two corresponding light emitting diodes 11 are lit.

[0041] When the self-checking of the detection control box is performed, the power knob 3 is rotated to self-checking, the driving power supplies the 1, 2 and 3, 4 ports of the detection solid state relay 15 with driving current, the internal optical coupling of the detection solid state relay 15 works, and the 5, 6 ports and the 7, 8 ports of the detection solid state relay 15 are connected. The logic conversion switch 4 is switched to logic A, the 3rd solid state relay 12 and the 4th solid state relay 13 are synchronously powered on, and four light emitting diodes 11 are all lit, which is equivalent to that when the detection logic conversion switch 4 is placed in the logic A gear, all the functions of the detection control box 1 are detected. The logic conversion switch 4 is switched to logic B, the 1st solid state relay 9 and the 2nd solid state relay 14 are synchronously powered on, and four light emitting diodes 11 are all lit, which is equivalent to that when the detection logic conversion switch 4 is placed in the logic B gear, all the functions of the detection control box 1 are detected.

[0042] Example one:

[0043] As Figure 4 , the logic switch 4 on the panel of the detection control box 1 is switched to the logic A gear, the knob 3 on the panel of the detection control box 1 is rotated to the self-checking, all the four light emitting diodes 11 are lit, indicating that the detection control box 1 is working normally, the knob 3 is automatically bounced back to the off gear after being released, the plug 5 of the replaceable adapter cable is connected to the plug 6 of the detection control box, the plug 7 of the replaceable adapter cable is connected to the measured airfield switch, the knob 3 is rotated to the on gear, the on-off state corresponding to the air and ground signals is determined according to the wheel load switch adjustment technical condition, the aircraft is lifted to make the wheels off the ground, the wheel load switch 8 is adjusted, when the two light emitting diodes 11 corresponding to the air signal on the panel of the detection control box 1 are lit, it indicates that the two groups of contacts of the wheel load switch are in the air state; after the aircraft is grounded, when the two light emitting diodes 11 corresponding to the ground signal on the panel of the detection control box 1 are lit, it indicates that the two groups of contacts of the wheel load switch are in the ground state. Through the wheel load signal detection device, the air and ground signals are both normal, that is, the adjustment of the wheel load signal is completed.

[0044] Example two:

[0045] The on-off state corresponding to the lock opening and locking of the tail wheel lock micro switch is determined, the adapter cable 2 is replaced, the logic switch 4 on the panel of the detection control box 1 is switched to the logic B gear, the tail wheel lock stroke is adjusted, and the light emitting diode lighting on the detection control box 1 is observed to complete the adjustment of the tail wheel lock.

[0046] The remaining steps are the same as step one.

[0047] Example three:

[0048] The on-off state corresponding to the lock opening and locking of the landing gear upper and lower lock micro switches is determined, the adapter cable 2 is replaced, the logic switch 4 on the panel of the detection control box 1 is switched to the logic A gear, the on-off state of the landing gear upper and lower lock micro switches is checked, and the detection of whether the landing gear is retracted in place is completed.

[0049] The remaining steps are the same as step one.

Claims

1. A universal wheel-mounted signal detection device, wherein the wheel-mounted signal is provided by a wheel-mounted switch, the wheel-mounted switch being mounted on the landing gear, characterized in that, Includes: a detection control box (1) and a replaceable adapter cable (2); A knob (3) is installed on the detection control box (1). The knob (3) has three positions: on, off, and self-test. The three positions correspond to the power on, power off, and self-test function of the detection control box (1), respectively. A logic switch (4) is installed on the detection control box (1). The logic switch (4) has two positions, namely logic A and logic B. The logic A and logic B positions correspond to the logic of a wheel load signal. When this wheel load signal testing device is used to test different models, the logic switch (4) needs to be switched to the corresponding position. Four light-emitting diodes (11) and four current-limiting resistors (10) are installed on the wheel-mounted signal detection and control box (1). The light-emitting diodes (11) are used to indicate the grounding status of the wheel-mounted signal. The first plug (5) of the replaceable adapter cable (2) is fitted with the detection control box socket (6), and the second plug (7) is fitted with the wheel-mounted switch (8); The detection control box (1) is equipped with a logic conversion circuit and a self-test circuit.

2. The universal wheel-mounted signal detection device according to claim 1, characterized in that, The detection control box is also equipped with four current-limiting resistors (10); the current-limiting resistors are used to protect the light-emitting diodes.

3. The universal wheel-mounted signal detection device according to claim 1, characterized in that, The logic conversion circuit includes 5 solid-state relays (9, 12, 13, 14, 15), 10 current-limiting resistors (10), and 3 power supplies (16); Solid-state relays include two drive terminals and two load terminals, with each load terminal corresponding to one of the drive terminals. When a drive current is applied to the drive terminal, the load terminal is switched on. When the drive current disappears, the load is disconnected. Due to the load characteristics of the solid-state relay, a current-limiting resistor (10) is added to the drive end to prevent the solid-state relays (9, 12, 13, 14, 15) from overloading. When the wheel switch (8) connector is connected to the second plug (7), the positive and negative terminals of the light-emitting diode (11) are turned on according to the on state of the wheel switch; When the logic switch (4) is switched to logic A, the drive power supply applies drive current to ports 1, 2 and 3, 4 of solid-state relays 3 (12) and 4 (13). The internal optocouplers of solid-state relays 3 (12) and 4 (13) are activated, and ports 5, 6 and 7, 8 of solid-state relays 3 (12) and 4 (13) are connected. The three contacts F, A, C and E, B, D of the detection control box socket (6) are in the connected state, which is used to detect the two sets of contacts of the wheel switch (8). When the tested contacts are in the air state, the two corresponding LEDs (11) are lit. When the tested contacts are in the ground state, the two corresponding LEDs (11) are lit.

4. The universal wheel-mounted signal detection device according to claim 3, characterized in that, When the logic switch (4) is switched to logic B, the drive power supply applies drive current to ports 1, 2, 3, and 4 of solid-state relay 1 (9) and solid-state relay 2 (14). The internal optocouplers of solid-state relay 1 (9) and solid-state relay 2 (14) are activated, and ports 5, 6, 7, and 8 of solid-state relay 1 (9) and solid-state relay 2 (14) are connected. The three contacts F, A, and C and the three contacts E, B, and D of the detection control box socket (6) are in the connected state, which can be used to detect the two sets of contacts of the wheel-mounted switch (8). When the tested contacts are in the air state, the two corresponding LEDs (11) are lit. When the tested contacts are in the ground state, the two corresponding LEDs (11) are lit.

5. The universal wheel-mounted signal detection device according to claim 1, characterized in that, For the self-test circuit, when the power knob (3) is turned to self-test, the drive power supply applies drive current to ports 1, 2 and 3, 4 of the detection solid-state relay (15), the internal optocoupler of the detection solid-state relay (15) works, and ports 5, 6 and 7, 8 of the detection solid-state relay (15) are connected.

6. The universal wheel-mounted signal detection device according to claim 1, characterized in that, The knob (3) is a three-position knob with two normally open contacts and a left-side rebound function. When the knob (3) is in the middle position, the internal logic conversion circuit of the detection control box (1) is in the closed state. When the knob (3) is in the right position, the internal logic conversion circuit of the detection control box (1) is powered on. When the knob (3) is in the left position, the internal self-test circuit of the detection control box (1) is powered on.

7. The universal wheel-mounted signal detection device according to claim 6, characterized in that, The self-test setting is a spring-loaded setting. After the test is completed, the knob will automatically spring back to the off setting to prevent accidental activation of the self-test position and depletion of power.

8. The universal wheel-mounted signal detection device according to claim 1, characterized in that, Wheel-mounted switches include ground-to-ground switches, tail wheel lock microswitches, and landing gear upper and lower position lock microswitches.

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