Signal detection circuit of actuator cylinder travel switch

Abstract

The invention relates to the technical field of aviation equipment circuit signal detection, in particular to a signal detection circuit of an actuator cylinder travel switch. The power socket switch module is connected with a power grid to supply power; a first voltage conversion module, an extension end travel switch detection module, a second voltage conversion module and a retraction end travel switch detection module which are mutually independent are arranged; the on-off signals of the travel switches at the extending end and the retracting end of the actuating cylinder are detected through power-on work at the same time, whether the undercarriage is retracted or put down or not is judged according to the signal feedback of the travel switches, the working efficiency is improved, on-off detection of each loop is achieved, and the credibility of the detection result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation equipment circuit signal detection, in particular to a signal detection circuit of an actuator stroke switch. Background Art

[0002] In the field of aviation, the retraction and extension of the aircraft landing gear, wheel well cover, flaps, speed brakes, nozzle adjustment, etc. are all achieved through the actuator. The extension and retraction ends of the actuator are respectively installed with travel switches. When the aircraft issues a down command, the execution system passes hydraulic oil to the actuator nozzle, and the piston rod of the actuator drives the attachment to extend. When it extends to a specific position, it triggers the paddle to press the travel switch. The state of the travel switch contact changes and sends a down signal, indicating that the actuator of the execution structure is in the down position; when the aircraft issues a retraction command, the execution system passes hydraulic oil to the actuator nozzle, and the piston rod of the actuator retracts. When it retracts to a specific position, it triggers the paddle to press the travel switch. The state of the travel switch contact changes and sends a retraction signal, indicating that the actuator of the execution structure is in the retracted position.

[0003] During the installation, commissioning and reliability test of the actuator, it is necessary to detect whether the travel switch signals at both ends of the actuator are normally connected and disconnected. The internal signal line of the socket electrical connector of the double redundant travel switch at the retracting end of the actuator has six pins, and the redundant travel switch has more pins, which are numbered 1-2-3-4-5-6 in sequence. Among them, 1-2 is connected, 1-3 is disconnected, and 4-5 is connected, 4-6 is disconnected, indicating that the piston rod is in the retracted position state, which is displayed as the retracted position signal. The existing detection circuit is as follows Figure 1 The figure shows a temporary jumper circuit composed of an excitation power supply, a multimeter, an adapter and connecting wires. During measurement, the multimeter is used to perform on-off detection on several signals at the same time. This method is difficult to detect because it is necessary to ensure a one-to-one correspondence between the pin numbers and the detection channel numbers, and the reliability of the detection results is low. For example, when the high and low temperature test products are taken out of the test box, the temperature cannot be maintained at a constant temperature for on-off signal inspection, and the measurement efficiency of the jumper circuit is low. Summary of the invention

[0004] Aiming at the problems that the existing on-off signal detection circuit of the travel switch is difficult to detect and the credibility of the detection result is low, the present invention proposes a signal detection circuit of the travel switch of the actuator cylinder; power is supplied by setting a power socket switch module connected to the power grid; a first voltage conversion module, an extension end travel switch detection module and a second voltage conversion module, a retracted end travel switch detection module are set independently of each other; the on-off signals of the travel switches at the extension end and the retracted end of the actuator cylinder are detected by powering on at the same time, and whether the landing gear is retracted / lowered is judged according to the signal feedback of the travel switch, thereby improving the work efficiency, realizing the on-off detection of each circuit, and increasing the credibility of the detection result.

[0005] The specific implementation contents of the present invention are as follows:

[0006] A signal detection circuit for an actuator stroke switch, comprising a power socket switch module, a first voltage conversion module, an extension end stroke switch detection module, a second voltage conversion module, and a retraction end stroke switch detection module;

[0007] The input end of the power socket switch module inputs AC power, and the output end is connected to the input end of the extension end travel switch detection module through the first voltage conversion module and connected to the input end of the retraction end travel switch detection module through the second voltage conversion module;

[0008] The output end of the extension end travel switch outputs an extension end travel switch on-off signal;

[0009] The output end of the retracted end travel switch outputs an on-off signal of the retracted end travel switch;

[0010] The power socket switch module is used to supply power after being connected to the power grid;

[0011] The first voltage conversion module is used to convert AC power into a first voltage signal;

[0012] The second voltage conversion module is used to convert the AC power into a second voltage signal;

[0013] The extended end travel switch detection module is used to generate an extended end travel switch on-off signal according to the first voltage signal, and judge whether the landing gear is retracted / lowered according to the extended end travel switch on-off signal;

[0014] The retracted end travel switch detection module is used to generate a retracted end travel switch on-off signal according to the second voltage signal, and determine whether the landing gear is retracted / lowered according to the retracted end travel switch on-off signal.

[0015] In order to better implement the present invention, further, the signal detection circuit of the actuator stroke switch also includes a first voltage and current meter and a second voltage and current meter;

[0016] The first voltage-current meter is arranged between the first voltage conversion module and the extension end travel switch detection module;

[0017] The second voltage-current meter is arranged between the second voltage conversion module and the retracted end travel switch detection module;

[0018] The first voltage-current meter is used to detect the contact quality of the extension end travel switch contact according to the acquired first current and voltage change signal;

[0019] The second voltage-current meter is used to detect the contact quality of the retracted end travel switch contacts according to the acquired second current and voltage change signal.

[0020] In order to better implement the present invention, further, the power switch socket module includes a socket J1, a resistor R0, and a light emitting diode power indicator light D1;

[0021] One end of the resistor R0 is connected to the first output end of the socket J1, the first input end of the first voltage conversion module, and the first input end of the second voltage conversion module, and the other end of the resistor R0 is connected to the input end of the light emitting diode power indicator D0;

[0022] The output end of the light emitting diode power indicator light D0 is connected to the second output end of the socket J1, the second input end of the first voltage conversion module, and the second input end of the second voltage conversion module;

[0023] The input end of the socket J1 inputs AC power, and the third output end is connected to the third input end of the first voltage conversion module and the third input end of the second voltage conversion module.

[0024] In order to better implement the present invention, further, the first voltage conversion module includes a first voltage conversion chip U1, a switch K1, a resistor R1, and a light emitting diode D1;

[0025] The input end of the first voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the first voltage conversion chip is connected to the switch K1, the second output end of the first voltage conversion chip is connected to the output end of the light emitting diode D1, and the third output end of the first voltage conversion chip is connected to the ground end;

[0026] One end of the resistor R1 is connected to the switch K1 and the input end of the extension end travel switch detection module, and the other end is connected to the input end of the light emitting diode D1;

[0027] The output end of the light emitting diode D1 is connected to the input end of the extension end travel switch detection module;

[0028] The first voltage conversion chip is used to convert the AC power signal into a 15V DC power signal.

[0029] In order to better implement the present invention, further, the second voltage conversion module includes a second voltage conversion chip U2, a switch K2, a resistor R2, and a light emitting diode D2;

[0030] The input end of the second voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the second voltage conversion chip is connected to the switch K2, the second output end of the second voltage conversion chip is connected to the output end of the light-emitting diode D2, and the third output end of the second voltage conversion chip is connected to the ground end;

[0031] One end of the resistor R2 is connected to the switch K2 and the input end of the retracted end travel switch detection module, and the other end is connected to the input end of the light emitting diode D2;

[0032] The output end of the light emitting diode D2 is connected to the input end of the retracted end travel switch detection module;

[0033] The second voltage conversion chip is used to convert the AC power signal into a 28V DC power signal.

[0034] In order to better implement the present invention, further, the extension end travel switch detection module includes a switch K3, a switch K4, a switch K5, a first electrical connector, and an extension end indication unit;

[0035] The input end of the switch K3 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K3 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0036] The input end of the switch K4 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K4 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0037] The input end of the switch K5 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K5 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0038] The output end of the extending end indicating unit is connected to a first voltage and current meter.

[0039] In order to better implement the present invention, further, the extended end indicating unit includes a plurality of resistors R3 and a red light emitting diode D3 connected in parallel;

[0040] The input ends of the multiple resistors R3 are connected to the output ends of the switches K3, K4 and K5 through the first electrical connector, and the output ends of the multiple resistors R3 are connected to the red light emitting diode D3;

[0041] The plurality of red light emitting diodes D3 are connected to a first voltage-current meter.

[0042] In order to better implement the present invention, further, the retracted end travel switch detection module includes a switch K6, a switch K7, a second electrical connector, and a retracted end indication unit;

[0043] The input end of the switch K6 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K6 is connected to the input end of the retracted end indicating unit through the second electrical connector;

[0044] The input end of the switch K7 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K7 is connected to the input end of the retracted end indicating unit through the second electrical connector;

[0045] The output end of the retracted end indicating unit is connected to a second voltage and current meter.

[0046] In order to better implement the present invention, further, the retracted end indicating unit includes a plurality of resistors R4 and a green light emitting diode D4 connected in parallel;

[0047] The input ends of the multiple resistors R4 are connected to the output ends of the switches K6 and K7 through the second electrical connector, and the output ends of the multiple resistors R4 are connected to the green light emitting diode D4;

[0048] The plurality of green light emitting diodes D4 are connected to a second voltage and current meter.

[0049] The present invention has the following beneficial effects:

[0050] The present invention sets two independent step-down and voltage-transforming systems, which can realize simultaneous power-on operation to detect the on-off signals of the travel switches at the extension end and the retraction end of the actuator cylinder, with high working efficiency and good economy. The circuit of the present invention also has the function of detecting the quality of the travel switch contact connection, thereby improving the reliability of the detection quality. By changing the definition of the electrical connector pin, it can be used for on-off signal detection of different types of products, and has the characteristics of good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 The present invention is a circuit diagram of a signal detection circuit of an existing actuator stroke switch.

[0052] Figure 2 This is a principle block diagram of the signal detection circuit of the actuator stroke switch provided by the present invention.

[0053] Figure 3 The circuit diagram provided by the present invention.

[0054] Figure 4 A circuit schematic diagram of a travel switch in a non-pressed state provided by an embodiment of the present invention.

[0055] Figure 5 A schematic diagram of a circuit in a pressed state of a travel switch provided in an embodiment of the present invention.

[0056] Figure 6A circuit schematic diagram of a travel switch in a non-pressed state provided by an embodiment of the present invention.

[0057] Figure 7 A schematic diagram of a circuit in a pressed state of a travel switch provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, and therefore should not be regarded as limiting the scope of protection. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Embodiment 1:

[0061] This embodiment provides a signal detection circuit for an actuator travel switch, such as Figure 2 As shown, it includes a power socket switch module, a first voltage conversion module, an extension end travel switch detection module, a second voltage conversion module, and a retracted end travel switch detection module;

[0062] The input end of the power socket switch module inputs AC power, and the output end is connected to the input end of the extension end travel switch detection module through the first voltage conversion module and connected to the input end of the retraction end travel switch detection module through the second voltage conversion module;

[0063] The output end of the extension end travel switch outputs an extension end travel switch on-off signal;

[0064] The output end of the retracted end travel switch outputs an on-off signal of the retracted end travel switch;

[0065] The power socket switch module is used to supply power after being connected to the power grid;

[0066] The first voltage conversion module is used to convert AC power into a first voltage signal;

[0067] The second voltage conversion module is used to convert the AC power into a second voltage signal;

[0068] The extended end travel switch detection module is used to generate an extended end travel switch on-off signal according to the first voltage signal, and judge whether the landing gear is retracted / lowered according to the extended end travel switch on-off signal;

[0069] The retracted end travel switch detection module is used to generate a retracted end travel switch on-off signal according to the second voltage signal, and determine whether the landing gear is retracted / lowered according to the retracted end travel switch on-off signal.

[0070] Working principle: This embodiment is powered by connecting a power socket switch module to the power grid; by setting up a first voltage conversion module, an extension end travel switch detection module and a second voltage conversion module, and a retracted end travel switch detection module that are independent of each other; it is possible to simultaneously power on and detect the on / off signals of the travel switches at the extension end and the retracted end of the actuator, and determine whether the landing gear is retracted / lowered based on the signal feedback from the travel switches, thereby improving work efficiency, realizing on / off detection of each circuit, and increasing the credibility of the detection results.

[0071] Embodiment 2:

[0072] This embodiment is based on the above embodiment 1. Figure 3 As shown, the signal detection circuit of the actuator stroke switch also includes a first voltage and current meter and a second voltage and current meter;

[0073] The first voltage-current meter is arranged between the first voltage conversion module and the extension end travel switch detection module;

[0074] The second voltage-current meter is arranged between the second voltage conversion module and the retracted end travel switch detection module;

[0075] The first voltage-current meter is used to detect the contact quality of the extension end travel switch contact according to the acquired first current and voltage change signal;

[0076] The second voltage-current meter is used to detect the contact quality of the retracted end travel switch contacts according to the acquired second current and voltage change signal.

[0077] Working principle: In this embodiment, a voltage and current meter is set to detect the contact quality of the contacts after the state of the travel switch changes. One end of the ammeter is connected between the switch and the current limiting resistor, and the other end is divided into two paths and connected to the two pin terminals of the electrical connector respectively. The voltmeter is connected in parallel at both ends of the electrical connector and the light-emitting diode.

[0078] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1, and thus will not be described in detail.

[0079] Embodiment 3:

[0080] This embodiment is based on any one of the above embodiments 1 to 2. Figure 3 As shown, the power switch socket module includes a socket J1, a resistor R0, and a light-emitting diode power indicator light D1;

[0081] One end of the resistor R0 is connected to the first output end of the socket J1, the first input end of the first voltage conversion module, and the first input end of the second voltage conversion module, and the other end of the resistor R0 is connected to the input end of the light emitting diode power indicator D0;

[0082] The output end of the light emitting diode power indicator light D0 is connected to the second output end of the socket J1, the second input end of the first voltage conversion module, and the second input end of the second voltage conversion module;

[0083] The input end of the socket J1 inputs AC power, and the third output end is connected to the third input end of the first voltage conversion module and the third input end of the second voltage conversion module.

[0084] Working principle: In this embodiment, after the power socket switch module is connected to the power grid through a three-pin plug and a wire, the current passes through the 500Ω current limiting resistor R0 to light up the light emitting diode D0 power indicator light and send out a power-on signal.

[0085] The other parts of this embodiment are the same as any one of the above-mentioned embodiments 1-2, so they will not be repeated here.

[0086] Embodiment 4:

[0087] This embodiment is based on any one of the above embodiments 1 to 3. Figure 3 As shown, the first voltage conversion module includes a first voltage conversion chip U1, a switch K1, a resistor R1, and a light emitting diode D1;

[0088] The input end of the first voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the first voltage conversion chip is connected to the switch K1, the second output end of the first voltage conversion chip is connected to the output end of the light emitting diode D1, and the third output end of the first voltage conversion chip is connected to the ground end;

[0089] One end of the resistor R1 is connected to the switch K1 and the input end of the extension end travel switch detection module, and the other end is connected to the input end of the light emitting diode D1;

[0090] The output end of the light emitting diode D1 is connected to the input end of the extension end travel switch detection module;

[0091] The first voltage conversion chip is used to convert the AC power signal into a 15V DC power signal.

[0092] The second voltage conversion module includes a second voltage conversion chip U2, a switch K2, a resistor R2, and a light emitting diode D2;

[0093] The input end of the second voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the second voltage conversion chip is connected to the switch K2, the second output end of the second voltage conversion chip is connected to the output end of the light-emitting diode D2, and the third output end of the second voltage conversion chip is connected to the ground end;

[0094] One end of the resistor R2 is connected to the switch K2 and the input end of the retracted end travel switch detection module, and the other end is connected to the input end of the light emitting diode D2;

[0095] The output end of the light emitting diode D2 is connected to the input end of the retracted end travel switch detection module;

[0096] The second voltage conversion chip is used to convert the AC power signal into a 28V DC power signal.

[0097] Working principle: In this embodiment, a closed loop is formed by connecting the first voltage conversion module, the switch K1, the current limiting resistor R1 and the light emitting diode D1 in series in sequence, and the current limiting resistor R1 is used to control the current passing through the light emitting diode;

[0098] The first voltage conversion module input end is connected to 220V AC power, and after internal voltage transformation and voltage reduction processing, the output end outputs the DC28V rated working voltage required by the actuator retraction end stroke switch.

[0099] The input end of the second voltage conversion module is connected to the power switch, and the output end is connected to the travel switch at the extension end of the actuator through an electrical connector, and its function is to convert 220V AC power into 28V DC power;

[0100] The second voltage conversion module input end is connected to 220V AC power, and after internal voltage transformation and voltage reduction processing, the output end outputs the DC28V rated working voltage required by the actuator extension end travel switch.

[0101] The second voltage conversion module, the switch K2, the current limiting resistor R2, and the light emitting diode D2 are sequentially connected in series to form a closed loop, and the current limiting resistor R2 is used to control the current passing through the light emitting diode;

[0102] When switch K is pressed, the high-potential current passes through the ammeter and then branches through the electrical connector to enter the corresponding contacts of the travel switch. After being limited by the resistor, the light-emitting diode is lit and returns to the bottom potential. In this circuit, if the light-emitting diode flashes, it means that the contacts of the travel switch are in poor contact.

[0103] The other parts of this embodiment are the same as any one of the above-mentioned embodiments 1 to 3, so they will not be repeated here.

[0104] Embodiment 5:

[0105] This embodiment is based on any one of the above embodiments 1 to 4. Figure 4 , Figure 5 As shown, the retracted end travel switch detection module includes a switch K6, a switch K7, a second electrical connector, and a retracted end indication unit;

[0106] The input end of the switch K6 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K6 is connected to the input end of the retracted end indicating unit through the second electrical connector;

[0107] The input end of the switch K7 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K7 is connected to the input end of the retracted end indicating unit through the second electrical connector;

[0108] The output end of the retracted end indicating unit is connected to a second voltage and current meter.

[0109] The retracted end indicating unit includes a plurality of resistors R4 and a green light emitting diode D4 connected in parallel;

[0110] The input ends of the multiple resistors R4 are connected to the output ends of the switches K6 and K7 through the second electrical connector, and the output ends of the multiple resistors R4 are connected to the green light emitting diode D4;

[0111] The plurality of red light emitting diodes D4 are connected to a second voltage and current meter.

[0112] Working principle: The main basis for judging whether the actuator cylinder is normally retracted / lowered is the signal feedback of the travel switch, which is also the standard for the pilot to judge whether the landing gear is retracted / lowered. For this reason, two sets of independent travel switch detection systems are designed for the retracted and lowered ends of the actuator cylinder during circuit design. The number of detection signals is determined according to the type of travel switch used at the retracted / extended ends of the actuator cylinder. In the circuit of this embodiment, the retracted end of the actuator cylinder adopts a double redundant travel switch (see Table 1). The corresponding design of the circuit is two on signals and two off signals (see Figure 4 and Figure 5 The actuator extension end uses a three-redundant travel switch, see Table 3, and the corresponding circuit design is three on signals and three off signals, see Figure 6 and Figure 7. During the signal detection process, it is necessary to accurately determine whether the mechanical lock inside the actuator is open / locked, and whether all the line signals for opening / locking are given. If not, it is necessary to determine which line is faulty, so as to facilitate quick troubleshooting. In view of these characteristics, the circuit of the present invention sets up a light-emitting diode in each pin loop to detect the open / lock signal. The circuit diagram design also ensures that the light-emitting diodes do not interfere with each other and work independently, so as to detect the on / off of each loop.

[0113] In the circuit design, light-emitting diodes are used as signal indicators, of which the power indicator is a red light-emitting diode and the signal indicator is a blue light-emitting diode, and the current passing through each is limited by a series resistor to prevent breakdown. The resistance value R of the current-limiting resistor can be calculated according to Ohm's law;

[0114]

[0115] Among them, R is the resistance of the current limiting resistor, V is the power supply voltage, VF is the forward voltage drop of the diode element in the circuit, which is generally 3V, and I is the current to be controlled, which is generally 5~10mA.

[0116] The full stroke of the travel switch of the actuator is only 4 to 6 mm. In order to detect the contact quality of the travel switch contacts, an ammeter and a voltmeter are designed in the circuit. The quality of the travel switch signal output can be determined by the changes in current and voltage.

[0117] Before the power is turned on, the push switch K1 and the push switch K2 are both in the off state, and the detection circuit is a non-closed loop. After the power is turned on, press the push switch K1 and the push switch K2 to put the detection circuit in working state. At the same time, the current flows through the current limiting resistor to generate a forward voltage drop, and the red LED is in a lit state; when the piston rod of the actuator is not extended, observe the state of the blue LED of the detection circuit of the retracted end of the piston rod of the actuator. If the blue LEDs 1-2 and 4-5 are all lit, the stroke switch of the retracted end of the piston rod of the actuator works normally, otherwise it is in a fault state; observe the state of the blue LED of the detection circuit of the extended end of the piston rod of the actuator. If the blue LEDs 1-2, 4-5 and 9-8 are all lit, the stroke switch of the extended end of the piston rod of the actuator works normally, otherwise it is in a fault state; if none of the blue LEDs are lit, observe the voltage and ammeter readings. If only the voltage meter reading is obtained, the stroke switch is in a fault state. If the ammeter reading is much smaller than the normal value, the stroke switch is in a poor contact fault state; if a blue LED is in a flashing state that turns on and off, it can be determined according to its position in the circuit which specific signal has a problem.

[0118] like Figure 6-Figure 7As shown in Table 1, this is a schematic diagram of the circuit of this embodiment used alone to detect the signal of the travel switch at the retracted end of the piston rod of the actuator, wherein the electrical connector is used as a connection carrier for converting the aviation plug and the socket, and the wiring is connected according to the pin definition table 1. When the travel switch at the retracted end of the piston rod of the actuator is in a free state, the internal pin connection of the detection circuit is that the normally closed contacts 1-2 and 4-5 are connected, the light-emitting diode indicator lights 1-2 and 4-5 are lit, the normally open contacts 1-3 and 4-5 are disconnected, and the light-emitting diode indicator lights 1-3 and 4-6 on the corresponding circuit are not lit; when the aircraft operating system issues an instruction to supply pressure to the retracted nozzle of the actuator, the piston rod retracts, and the piston rod retracts to the bottom to trigger the paddle to press the travel switch, forcing the internal contact state to change, that is, contacts 1-2 and 4-5 are disconnected, and the corresponding light-emitting diode indicator lights 1-2 and 4-5 are off, and contacts 1-3 and 4-5 are connected. Figure 5 , the LED indicators 1-3 and 4-6 on the corresponding circuits light up.

[0119] In this embodiment, the circuit light emitting diode connected to the retracting end of the actuator cylinder is a green light emitting diode.

[0120] The other parts of this embodiment are the same as any one of the above-mentioned embodiments 1 to 4, so they are not repeated here.

[0121] Embodiment 6:

[0122] This embodiment is based on any one of the above embodiments 1 to 5. Figure 6 , Figure 7 As shown, the extension end travel switch detection module includes a switch K3, a switch K4, a switch K5, a first electrical connector, and an extension end indication unit;

[0123] The input end of the switch K3 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K3 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0124] The input end of the switch K4 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K4 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0125] The input end of the switch K5 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K5 is connected to the input end of the extension end indicating unit through the first electrical connector;

[0126] The output end of the extending end indicating unit is connected to a first voltage and current meter.

[0127] The extended end indicating unit includes a plurality of resistors R3 and a red light emitting diode D3 connected in parallel;

[0128] The input ends of the multiple resistors R3 are connected to the output ends of the switches K3, K4 and K5 through the first electrical connector, and the output ends of the multiple resistors R3 are connected to the red light emitting diode D3;

[0129] The plurality of red light emitting diodes D3 are connected to a first voltage-current meter.

[0130] Table 1 Pin definition of travel switch at the retracted end of the actuator piston rod

[0131] Pin number Function Definition Remark 1 Working power supply 1+ Voltage +DC(28±0.2)V 2 Output signal 1 Purple Line 3 Output signal 1 4 Working power 2+ Voltage DC (28 ± 0.2) V 5 Output signal 2 6 Output signal 2

[0132] Working principle: This embodiment is used alone to detect the principle diagram of the stroke switch signal at the extended end of the piston rod of the actuator cylinder, in which the electrical connector is used as a connection carrier for converting the aviation plug and the socket, and the wiring is connected according to the pin definition table 3. When the stroke switch at the extended end of the piston rod of the actuator cylinder is in the free state, the internal pin connection of the detection circuit is that the normally closed contacts 1-2, 4-5, and 9-8 are connected, the light-emitting diode indicator lights 1-2, 4-5, and 9-8 are lit, and the normally open contacts 1-7, 4-6, and 9-3 are disconnected, corresponding to the circuit The LED indicators 1-7, 4-6, and 9-3 are off; when the aircraft operating system issues a command to supply pressure to the actuator to extend the nozzle, the piston rod extends, and when the piston rod extends to the end, it triggers the paddle to press the travel switch, forcing the internal contacts to change state, that is, contacts 1-2, 4-5, and 9-8 are disconnected, and the corresponding LED indicators 1-2, 4-5, and 9-8 are off, and contacts 1-7, 4-6, and 9-3 are connected, and the LED indicators 1-7, 4-6, and 9-3 on the corresponding circuits are lit.

[0133] Table 3 Pin definition of travel switch at the extension end of the actuator piston rod

[0134] Pin number Function Definition Remark 1 Working power supply 1+ Voltage DC (15 ± 0.2) V, current 100 mA 2 Output signal 1 3 Output signal 1 4 Working power 2+ Voltage DC (15 ± 0.2) V, current 100 mA 5 Output signal 2 6 Output signal 2 9 Working power 3+ Voltage DC (15 ± 0.2) V, current 100 mA 8 Output signal 3 7 Output signal 3

[0135] The electrical connector provided in this embodiment is an aviation small circular electrical connector; the circuit light emitting diode connected to the extended end of the actuator cylinder in this embodiment is a red light emitting diode.

[0136] The other parts of this embodiment are the same as any one of the above-mentioned embodiments 1 to 5, so they will not be repeated here.

[0137] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A signal detection circuit for an actuator travel switch, characterized in that: It includes a power socket switch module, a first voltage conversion module, an extension end travel switch detection module, a second voltage conversion module, and a retraction end travel switch detection module; The input end of the power socket switch module inputs AC power, and the output end is connected to the input end of the extension end travel switch detection module through the first voltage conversion module and connected to the input end of the retraction end travel switch detection module through the second voltage conversion module; The output end of the extension end travel switch outputs an extension end travel switch on-off signal; The output end of the retracted end travel switch outputs an on-off signal of the retracted end travel switch; The power socket switch module is used to supply power after being connected to the power grid; The first voltage conversion module is used to convert AC power into a first voltage signal; The second voltage conversion module is used to convert the AC power into a second voltage signal; The extended end travel switch detection module is used to generate an extended end travel switch on-off signal according to the first voltage signal, and judge whether the landing gear is retracted / lowered according to the extended end travel switch on-off signal; The retracted end travel switch detection module is used to generate a retracted end travel switch on-off signal according to the second voltage signal, and determine whether the landing gear is retracted / lowered according to the retracted end travel switch on-off signal.

2. The signal detection circuit of the actuator stroke switch according to claim 1, characterized in that: The signal detection circuit of the actuator stroke switch also includes a first voltage and current meter and a second voltage and current meter; The first voltage-current meter is arranged between the first voltage conversion module and the extension end travel switch detection module; The second voltage-current meter is arranged between the second voltage conversion module and the retracted end travel switch detection module; The first voltage-current meter is used to detect the contact quality of the extension end travel switch contact according to the acquired first current and voltage change signal; The second voltage-current meter is used to detect the contact quality of the retracted end travel switch contacts according to the acquired second current and voltage change signal.

3. The signal detection circuit of the actuator stroke switch according to claim 1, characterized in that: The power switch socket module includes a socket J1, a resistor R0, and a light emitting diode power indicator light D1; One end of the resistor R0 is connected to the first output end of the socket J1, the first input end of the first voltage conversion module, and the first input end of the second voltage conversion module, and the other end of the resistor R0 is connected to the input end of the light emitting diode power indicator D0; The output end of the light emitting diode power indicator light D0 is connected to the second output end of the socket J1, the second input end of the first voltage conversion module, and the second input end of the second voltage conversion module; The input end of the socket J1 inputs AC power, and the third output end is connected to the third input end of the first voltage conversion module and the third input end of the second voltage conversion module.

4. The signal detection circuit of the actuator stroke switch according to claim 1, characterized in that: The first voltage conversion module includes a first voltage conversion chip U1, a switch K1, a resistor R1, and a light emitting diode D1; The input end of the first voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the first voltage conversion chip is connected to the switch K1, the second output end of the first voltage conversion chip is connected to the output end of the light emitting diode D1, and the third output end of the first voltage conversion chip is connected to the ground end; One end of the resistor R1 is connected to the switch K1 and the input end of the extension end travel switch detection module, and the other end is connected to the input end of the light emitting diode D1; The output end of the light emitting diode D1 is connected to the input end of the extension end travel switch detection module; The first voltage conversion chip is used to convert the AC power signal into a 28V DC power signal.

5. The signal detection circuit of the actuator stroke switch according to claim 1, characterized in that: The second voltage conversion module includes a second voltage conversion chip U2, a switch K2, a resistor R2, and a light emitting diode D2; The input end of the second voltage conversion chip is connected to the output end of the power switch socket module, the first output end of the second voltage conversion chip is connected to the switch K2, the second output end of the second voltage conversion chip is connected to the output end of the light-emitting diode D2, and the third output end of the second voltage conversion chip is connected to the ground end; One end of the resistor R2 is connected to the switch K2 and the input end of the retracted end travel switch detection module, and the other end is connected to the input end of the light emitting diode D2; The output end of the light emitting diode D2 is connected to the input end of the retracted end travel switch detection module; The second voltage conversion chip is used to convert the AC power signal into a 15V DC power signal.

6. The signal detection circuit of the actuator stroke switch according to claim 2, characterized in that: The extension end travel switch detection module includes a switch K3, a switch K4, a switch K5, a first electrical connector, and an extension end indication unit; the input end of the switch K3 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K3 is connected to the input end of the extension end indication unit through the first electrical connector; The input end of the switch K4 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K4 is connected to the input end of the extension end indicating unit through the first electrical connector; The input end of the switch K5 is connected to the first voltage and current meter through the first electrical connector, and the output end of the switch K5 is connected to the input end of the extension end indicating unit through the first electrical connector; The output end of the extending end indicating unit is connected to a first voltage and current meter.

7. A signal detection circuit for an actuator travel switch according to claim 6, characterized in that: The extended end indicating unit includes a plurality of resistors R3 and a red light emitting diode D3 connected in parallel; The input ends of the multiple resistors R3 are connected to the output ends of the switches K3, K4 and K5 through the first electrical connector, and the output ends of the multiple resistors R3 are connected to the red light emitting diode D3; The plurality of red light emitting diodes D3 are connected to a first voltage-current meter.

8. The signal detection circuit of the actuator travel switch according to claim 2, characterized in that: The retracted end travel switch detection module includes a switch K6, a switch K7, a second electrical connector, and a retracted end indication unit; The input end of the switch K6 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K6 is connected to the input end of the retracted end indicating unit through the second electrical connector; The input end of the switch K7 is connected to the second voltage and current meter through the second electrical connector, and the output end of the switch K7 is connected to the input end of the retracted end indicating unit through the second electrical connector; The output end of the retracted end indicating unit is connected to a second voltage and current meter.

9. The signal detection circuit of the actuator stroke switch according to claim 8, characterized in that: The retracted end indicating unit includes a plurality of resistors R4 and a green light emitting diode D4 connected in parallel; The input ends of the multiple resistors R4 are connected to the output ends of the switches K6 and K7 through the second electrical connector, and the output ends of the multiple resistors R4 are connected to the green light emitting diode D4; The plurality of red light emitting diodes D4 are connected to a second voltage and current meter.

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