Testing device and testing method for sensor
By designing a testing device that includes an air knife, a rotating mechanism, and a thermistor, the problems of detecting the sensitivity of the wind vane and the uniformity of heating of the angle of attack sensor were solved, realizing continuous testing and efficient detection of the angle of attack sensor and ensuring aviation flight safety.
Patent Information
- Application Number
- CN202610285548.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-10
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies lack a dynamic testing mechanism for the sensitivity of angle-of-attack sensors and weather vanes. The testing devices have poor thermal insulation performance, making continuous testing impossible. Furthermore, insufficient detection of heating uniformity leads to low testing efficiency and poses a potential safety hazard to aircraft flight.
A testing device was designed, comprising a support, a test chamber, an air knife, a rotating mechanism, a positioning mechanism, a driving mechanism, and an angle adjustment mechanism. It simulates an airflow environment using a fan, performs multi-point temperature measurement using a thermistor, and achieves continuous testing by combining a motor drive and a positioning mechanism. It also has a heat preservation function and can detect the sensitivity of the wind vane and the uniformity of heating in real time.
Dynamic testing of the angle-of-attack sensor's wind vane sensitivity was achieved, ensuring stable test chamber temperature, improving testing efficiency, reducing potential aircraft flight safety hazards, and enhancing the accuracy of heating uniformity testing.
Smart Images
Figure CN121995081A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of sensor detection technology, specifically to a testing device and method for sensors. Background Technology
[0002] Angle of attack (AOA) sensors are core sensing components in aircraft flight control systems. They sense the angle of airflow through a weather vane, providing accurate AOA data for aircraft attitude control and flight navigation. The weather vane's response sensitivity directly determines the accuracy of the AOA detection. The uniformity of the sensor's heating system is crucial for ensuring the weather vane rotates flexibly and preventing detection failure due to frost buildup in low-temperature flight environments. Therefore, accurate testing of the weather vane sensitivity and heating uniformity during the factory testing and installation maintenance phases of AOA sensors is an important step in avoiding potential aircraft flight safety hazards and ensuring aviation safety.
[0003] Currently, in the field of aviation testing, dedicated testing equipment for aircraft angle-of-attack sensors still has many technical shortcomings, making it difficult to meet the needs of actual testing. The specific problems are as follows: 1. There is a lack of dynamic testing mechanism for the sensitivity of the angle of attack sensor wind vane. The existing testing device cannot simulate the wind environment in actual flight and can not dynamically adjust the angle of the sensor. There is also no real-time wind vane response feedback and abnormal alarm structure. It cannot accurately detect the response sensitivity of the wind vane under different angles and stable wind forces. Some sensors with substandard sensitivity have entered the use stage, which poses a serious safety hazard to aircraft flight. 2. The test device has poor thermal insulation performance. When changing the angle of attack sensor to be tested, the temperature control gas inside the test chamber is prone to rapid loss, causing a sudden change in the temperature inside the chamber. After each sensor test is completed, the temperature of the test chamber needs to be readjusted, which makes it impossible to continuously test the angle of attack sensor, greatly reducing the overall testing efficiency and increasing the testing time and cost. 3. There are significant deficiencies in the detection methods for the heating uniformity of the angle of attack sensor. Existing detection methods mostly adopt a single-point temperature measurement mode, which cannot perform multi-point synchronous temperature measurement on the sensor body. It is difficult to accurately determine the working status and heating uniformity of the sensor heater. The problem of uneven heating cannot be detected in time. Local overheating or underheating of the sensor will directly lead to increased resistance to the rotation of the wind vane and decreased sensitivity, affecting its actual use effect. 4. The installation and fixing structure of the angle of attack sensor has poor adaptability and integration. The traditional clamping structure is cumbersome to operate, and the temperature measuring component is independent of the fixing structure. During the test, the sensor fixing and temperature measuring point layout need to be completed separately, which increases the detection operation steps and further reduces the detection efficiency. At the same time, the single-point temperature measurement method cannot reflect the overall temperature distribution of the sensor.
[0004] In summary, there is a need for a dedicated testing device that can dynamically test the sensitivity of angle-of-attack sensors, has a heat preservation function for continuous testing, and can perform multi-point temperature measurement on the sensor to detect heating uniformity. This device would solve the problems existing in the current technology, improve the testing accuracy and efficiency of aircraft angle-of-attack sensors, and ensure aviation flight safety. Summary of the Invention
[0005] The purpose of this invention is to provide a testing device and method for sensors, in order to solve the problems of existing technologies that cannot test the wind vane sensitivity of angle-of-attack sensors, require temperature control for each angle-of-attack sensor, and cannot measure temperature uniformly.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing device for sensors, comprising a bracket, a test chamber fixedly connected to the top of the bracket, the front of the test chamber being transparent, allowing observation of the interior of the test chamber, an air knife and a rotating mechanism respectively installed on the left and right sides of the test chamber, a positioning mechanism embedded in the right end of the front of the test chamber, which positions the rotated mechanism after movement, a driving mechanism installed on the left side of the rotating mechanism, an angle adjustment mechanism installed on the front of the driving mechanism, a vertical plate installed on the front left side of the top of the test chamber, an alarm light and a controller respectively installed at the top and bottom ends of the front of the vertical plate, and the alarm light and the controller being electrically connected, a fan electrically connected to the controller being installed on the upper surface of the test chamber, the air inlet and outlet of the fan being connected to the rotating mechanism and the air knife respectively through air pipes, providing gas to the air knife under the suction of the fan, and the air knife blowing air horizontally from left to right.
[0007] Preferably, the rotating mechanism includes a corner plate connected to the top of the right side wall of the test chamber by a pin. The corner plate is right-angled, and slots are provided at both ends of the front side of the corner plate. The positioning mechanism cooperates with the slots to position the corner plate. A wind hood is installed on the right side wall of the corner plate, and the wind hood is connected to the air inlet of the fan through an air pipe.
[0008] Preferably, the purpose is to position the diagonal plate after rotation, preventing heat loss inside the test chamber when replacing the angle of attack sensor. The positioning mechanism includes a box embedded in the right side of the front of the test chamber. A first guide rod is vertically installed in the inner cavity of the box. Springs and push plates are respectively sleeved at the upper and lower ends of the outer wall of the first guide rod. Under the action of the spring force, the push plate is pushed down. A guide groove is opened on the rear side of the outer wall of the push plate. A plug rod that can slide back and forth is inserted into the rear side of the box. The rear end of the plug rod is inserted into the slot for positioning of the diagonal plate. The rear side of the plug rod is triangular to facilitate the insertion of the plug rod into the slot. A guide post that is inserted into the inner cavity of the guide groove is installed at the front end of the plug rod.
[0009] Preferably, the guide grooves are inclinedly distributed on the outer wall of the push plate.
[0010] Preferably, the purpose is to allow the angle adjustment mechanism to swing up and down to test the aircraft angle of attack sensor under constant wind conditions. The drive mechanism includes a drive box installed on the left side wall of the corner plate. A motor electrically connected to the controller is installed on the right side of the upper surface of the drive box. A rotating drum is installed at the output end of the motor. A sliding groove is opened on the outer wall of the rotating drum. A second guide rod is vertically installed in the middle of the inner cavity of the drive box. A rack that can slide up and down is sleeved on the outer wall of the second guide rod. A pin that inserts into the inner cavity of the sliding groove is installed on the right side wall of the rack. The pin is cylindrical in shape and can slide smoothly in the sliding groove due to the curvature of the pin itself. A first rotating shaft is installed on the left side of the front of the drive box through a bearing. A first spur gear that meshes with the rack is installed at the rear end of the first rotating shaft. When the rack rises or falls, the first spur gear drives the first rotating shaft to rotate back and forth.
[0011] Preferably, the sluices are elliptical and connected end to end on the outer wall of the rotating cylinder.
[0012] Preferably, the angle adjustment mechanism includes a second rotating shaft connected to the front end of the first rotating shaft. A second spur gear and a rotating rod are respectively installed at the front and rear ends of the outer wall of the second rotating shaft, and the second spur gear is hidden inside the rotating rod. A third spur gear that meshes with the second spur gear is connected to the right side of the front of the rotating rod via a pin. A fixing rod is installed at the left end of the front of the rotating rod. An installation assembly is installed at the front end of the fixing rod for installing the aircraft angle of attack sensor. A bushing and a turntable are respectively sleeved on the outer wall of the fixing rod from front to back, and the front of the turntable is connected to the rear end of the bushing. One end of a connecting rod is connected to the outer side of the front of the turntable via a pin, and the other end of the connecting rod is connected to the outer side of the front of the third spur gear via a pin. The connecting rod enables the third spur gear to move in conjunction with the turntable. One end of a swing arm is installed on the outer wall of the bushing, and a proximity switch electrically connected to the controller is installed at the other end of the swing arm. As the rotating rod swings, the pendulum remains horizontal, and the sensitivity of the wind vane on the angle of attack sensor is tested using a proximity switch.
[0013] Preferably, the second spur gear and the third spur gear have the same shape.
[0014] Preferably, the mounting assembly includes a hollow ring mounted on the front end of a fixed rod. The inner cavity of the hollow ring is fitted with an aircraft angle-of-attack sensor. A rotatable rotating ring is inserted into the inner cavity of the hollow ring. One end of a tension spring is snapped onto the front of the rotating ring, and the other end of the tension spring is snapped onto the inner wall of the hollow ring. Under the tension of the tension spring, the rotating ring is pulled to rotate clockwise. Several traction rods are equidistantly mounted on the front of the rotating ring along the circumference via pins. Several clamping blocks are equidistantly inserted into the inner wall of the hollow ring along the circumference. A stop bar is installed in the middle of each clamping block to limit the movement distance of the clamping block. The other end of the traction rod is sleeved on the outer wall of the stop bar. A thermistor electrically connected to the controller is embedded inside the clamping block. The resistance of the thermistor is proportional to the temperature, and the temperature is measured by the change in the thermistor current. By measuring the temperature at multiple points on the aircraft's angle-of-attack sensor using thermistors at different locations, the integrity of the sensor's heater can be tested.
[0015] Preferably, the inner side of the front of the clamping block is a slope.
[0016] A testing method for sensors includes the following steps: S1. Clamp the aircraft angle of attack sensor onto the mounting assembly so that the thermistor contacts the side wall of the sensor; S2. Start the fan. The fan draws in air through the rotating mechanism and supplies air to the air knife. The air knife blows air horizontally to simulate the airflow environment. At the same time, the condenser is started to control the temperature of the test chamber to simulate the temperature and humidity environment of an aircraft flight. S3. Start the drive mechanism, drive the angle adjustment mechanism to make the angle of attack sensor swing, the swing arm always stays horizontal, and detect the sensor wind vane response status through the proximity switch. If the wind vane swing lags behind the swing arm, the proximity switch triggers the controller to start the alarm light. S4. Use the thermistor on the mounting assembly to perform multi-point synchronous temperature measurement on the angle of attack sensor, and obtain the temperature measurement data through the controller to detect the heating uniformity of the sensor. S5. When replacing the sensor to be tested, operate the positioning mechanism to release the positioning of the rotating mechanism, rotate the rotating mechanism to move the drive mechanism and angle adjustment mechanism out of the test box, and at the same time, the rotating mechanism closes the test box. After the sensor replacement is completed, reverse the operation of the positioning mechanism to reset the rotating mechanism and reposition it, and continue to perform sensor testing.
[0017] The present invention provides a testing device for sensors, which has the following advantages: 1. This invention uses a motor to drive a rotating drum, which, in conjunction with a sliding groove and a pin, causes a rack to reciprocate upwards or downwards. The rack, driven by a first spur gear, allows the first and second rotating shafts to rotate synchronously. Because the second and third spur gears mesh, the turntable moves in the opposite direction to the second spur gear under the traction of a connecting rod. Therefore, the swing arm on the bushing swings in the opposite direction to the rotating rod. As the swing arm drives the angle-of-attack sensor to swing, the swing arm remains horizontal. If the angle-of-attack sensor's wind vane swings out of sync with the swing arm, a proximity switch triggers an alarm light on the controller, causing the alarm to illuminate and thus enabling the angle-of-attack sensor's wind vane sensitivity test, significantly reducing safety hazards during aircraft flight.
[0018] 2. This invention uses an upward-lifting push plate to push the insertion rod out of the slot with the cooperation of the guide groove and guide post, releasing the diagonal plate positioning. The diagonal plate is rotated 90 degrees, and the spring force pushes the push plate down. With the cooperation of the guide groove and guide post, the insertion rod moves backward and inserts into another slot, rotating out the drive mechanism and angle adjustment mechanism and closing the test chamber. When replacing the angle of attack sensor, the test chamber will not experience heat loss, has a heat preservation function, and can perform continuous testing of the angle of attack sensor, improving the testing efficiency of the angle of attack sensor.
[0019] 3. This invention uses the tension of a spring to pull the rotating ring to rotate clockwise, causing the traction rod to pull the clamping block to move inward. The thermistor contacts the side wall of the aircraft angle of attack sensor, and multiple temperature measurements are taken when the aircraft angle of attack sensor is heated to test the heating uniformity of the aircraft angle of attack sensor and prevent uneven heating from reducing the sensitivity of the weather vane. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the rotating mechanism. Figure 3 This is a schematic diagram of the positioning mechanism. Figure 4 Left sectional view of the positioning mechanism; Figure 5 This is a schematic diagram of the drive mechanism and the angle adjustment mechanism. Figure 6 This is a front sectional view of the drive mechanism; Figure 7 This is the main view of the rotating drum; Figure 8 This is a schematic diagram of the angle adjustment mechanism. Figure 9 This is a front sectional view of the angle adjustment mechanism; Figure 10 Main view for installing components; Figure 11 This is a schematic diagram of the clamping block structure.
[0021] In the diagram: 1. Bracket; 2. Test box; 3. Air knife; 4. Rotation mechanism; 5. Positioning mechanism; 6. Drive mechanism; 7. Angle adjustment mechanism; 8. Vertical plate; 9. Alarm light; 10. Controller; 11. Fan; 12. Condenser; 41. Angle plate; 42. Slot; 43. Air hood; 51. Box body; 52. First guide rod; 53. Spring; 54. Push plate; 55. Guide groove; 56. Insert rod; 57. Guide column; 61. Drive box; 62. Motor; 63. Rotary drum; 64. Slide groove; 65. 66. Second guide rod; 67. Rack; 68. Pin; 69. First rotating shaft; 70. First spur gear; 71. Second rotating shaft; 72. Second spur gear; 73. Rotating rod; 74. Third spur gear; 75. Fixed rod; 76. Mounting assembly; 77. Bushing; 78. Turntable; 79. Connecting rod; 710. Swing rod; 711. Proximity switch; 761. Hollow ring; 762. Rotary ring; 763. Tension spring; 764. Traction rod; 765. Clamping block; 766. Stop bar; 767. Thermistor. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Please see Figures 1-11 This invention provides a technical solution: a testing device for sensors, including a support 1, a test box 2 fixedly connected to the top of the support 1, the front of the test box 2 being transparent, allowing observation of the interior of the test box 2, an air knife 3 and a rotating mechanism 4 respectively installed on the left and right sides of the test box 2, a positioning mechanism 5 embedded in the right end of the front of the test box 2, which positions the rotated mechanism 4 after it has moved, a driving mechanism 6 installed on the left side of the rotating mechanism 4, an angle adjustment mechanism 7 installed on the front of the driving mechanism 6, a vertical plate 8 installed on the front left side of the top of the test box 2, an alarm light 9 and a controller 10 respectively installed at the top and bottom ends of the front of the vertical plate 8, and the alarm light 9 and the controller 10 being electrically connected, a fan 11 electrically connected to the controller 10 installed on the upper surface of the test box 2, the air inlet and outlet of the fan 11 being connected to the rotating mechanism 4 and the air knife 3 respectively through air pipes, providing gas to the air knife 3 under the suction of the fan 11, and the air knife 3 blowing air horizontally from left to right.
[0024] As a preferred embodiment, the rotating mechanism 4 further includes a corner plate 41 connected to the top of the right side wall of the test chamber 2 by a pin. The corner plate 41 is right-angled, and slots 42 are provided at both ends of the front of the corner plate 41. The positioning mechanism 5 cooperates with the slots 42 to position the corner plate 41. A fan shroud 43 is installed on the right side wall of the corner plate 41, and the fan shroud 43 is connected to the air inlet of the fan 11 through an air pipe.
[0025] As a preferred embodiment, the positioning mechanism 5 further includes a box 51 embedded in the right side of the front of the test box 2. A first guide rod 52 is vertically installed in the inner cavity of the box 51. A spring 53 and a push plate 54 are respectively sleeved at the upper and lower ends of the outer wall of the first guide rod 52. Under the elastic force of the spring 53, the push plate 54 is pushed down. A guide groove 55 is opened on the rear side of the outer wall of the push plate 54. A plug rod 56 that can slide back and forth is inserted into the rear side of the box 51. The rear end of the plug rod 56 is inserted into the diagonal plate 41 in the slot 42 for positioning. The rear side of the plug rod 56 is triangular to facilitate the insertion of the plug rod 56 into the slot 42. A guide post 57 that is inserted into the inner cavity of the guide groove 55 is installed at the front end of the plug rod 56. The guide groove 55 is inclinedly distributed on the outer wall of the push plate 54. When the push plate 54 moves up and down, the inclined surface of the guide groove 55 can press the guide post 57 forward or backward, thereby achieving the purpose of moving the plug rod 56 back and forth.
[0026] As a preferred embodiment, the drive mechanism 6 further includes a drive box 61 mounted on the left side wall of the corner plate 41. A motor 62 electrically connected to the controller 10 is mounted on the right side of the upper surface of the drive box 61. A rotating drum 63 is mounted on the output end of the motor 62. A groove 64 is formed on the outer wall of the rotating drum 63. The groove 64 is elliptical and distributed end to end on the outer wall of the rotating drum 63. The groove 64 is divided into two parts by a vertical plane. When the rotating drum 63 rotates, if the inclined surface of one part of the groove 64 presses the pin 67 upward, the inclined surface of the other part presses the pin 67 downward, thereby realizing the up and down movement of the rack 66. The drive housing 61 has a reciprocating motion. A second guide rod 65 is vertically installed in the middle of the inner cavity. A rack 66 that can slide up and down is sleeved on the outer wall of the second guide rod 65. A pin 67 that is inserted into the inner cavity of the slide groove 64 is installed on the right side wall of the rack 66. The pin 67 is cylindrical in shape. The curved surface of the pin 67 allows it to slide smoothly in the slide groove 64. A first rotating shaft 68 is installed on the left side of the front of the drive housing 61 through a bearing. A first spur gear 69 that meshes with the rack 66 is installed at the rear end of the first rotating shaft 68. When the rack 66 rises or falls, the first spur gear 69 drives the first rotating shaft 68 to rotate back and forth.
[0027] As a preferred embodiment, the angle adjustment mechanism 7 further includes a second rotating shaft 71 connected to the front end of the first rotating shaft 68. A second spur gear 72 and a rotating rod 73 are respectively installed at the front and rear ends of the outer wall of the second rotating shaft 71, with the second spur gear 72 hidden inside the rotating rod 73. A third spur gear 74, meshing with the second spur gear 72, is connected to the right side of the front of the rotating rod 73 via a pin. The second spur gear 72 and the third spur gear 74 have the same shape, allowing them to rotate synchronously in opposite directions, thereby causing the turntable 78 to rotate in the opposite direction to the second spur gear 72. A fixing rod 75 is installed at the left end of the front of the rotating rod 73, and an installation assembly 76 is installed at the front end of the fixing rod 75. An angle-of-attack sensor is installed on the mounting assembly 76. The mounting assembly 76 and the wind knife 3 are in the same plane, so that the wind force generated by the wind knife 3 directly acts on the angle-of-attack sensor on the mounting assembly 76. The outer wall of the fixing rod 75 is fitted with a bushing 77 and a turntable 78 from front to back. The front of the turntable 78 is connected to the rear end of the bushing 77. The outer side of the front of the turntable 78 is connected to one end of the connecting rod 79 by a pin. The other end of the connecting rod 79 is connected to the outer side of the front of the third spur gear 74 by a pin. The connecting rod 79 enables the third spur gear 74 to move in conjunction with the turntable 78. One end of the swing arm 710 is installed on the outer wall of the bushing 77. The other end of the swing arm 710 is equipped with a proximity switch 711 that is electrically connected to the controller 10.
[0028] As a preferred embodiment, the mounting assembly 76 further includes a hollow ring 761 mounted on the front end of the fixed rod 75. The inner cavity of the hollow ring 761 is fitted with an aircraft angle-of-attack sensor. A rotatable rotating ring 762 is inserted into the inner cavity of the hollow ring 761. One end of a tension spring 763 is engaged with the front of the rotating ring 762, and the other end of the tension spring 763 is engaged with the inner wall of the hollow ring 761. Under the tension of the tension spring 763, the rotating ring 762 is pulled to rotate clockwise. Several traction rods 764 are equidistantly mounted on the front of the rotating ring 762 along the circumferential direction via pins. The inner wall of the hollow ring 761... Several clamping blocks 765 are inserted at equal intervals. The inner side of the front of each clamping block 765 is inclined. When the inclined surface of the clamping block 765 is squeezed by the aircraft angle of attack sensor, the clamping block 765 can automatically move outward. A stop bar 766 is installed in the middle of the clamping block 765 to limit the movement distance of the clamping block 765. The other end of the traction rod 764 is sleeved on the outer wall of the stop bar 766. A thermistor 767 is embedded in the inner side of the clamping block 765 and is electrically connected to the controller 10. The resistance of the thermistor 767 is proportional to the temperature. The temperature is measured by the change in the current of the thermistor 767.
[0029] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.
[0030] Step 1: The controller 10 starts the fan 11. The fan 11 draws in air through the shroud 43 and then delivers the air to the air knife 3. The air knife 3 blows air from left to right. The condenser 12 cools the test chamber 2 to simulate the high temperature and low temperature environment of the aircraft. Step two: The controller 10 starts the motor 62, which drives the rotating drum 63 to rotate. The slide 64 is divided into two parts: one part has the inclined surface pressing pin 67 moving upward, and the other part has the inclined surface pressing pin 67 moving downward. Therefore, the rack 66 moves up and down reciprocally, which in turn causes the first spur gear 69 to rotate counterclockwise and clockwise. The first rotating shaft 68 and the second rotating shaft 71 rotate synchronously, and the second spur gear 72 and the rotating rod 73 rotate. Under the transmission of the second spur gear 72 and the third spur gear 74, the connecting rod 79 drives the rotating drum 63 to rotate. The disc 78 and the second spur gear 72 move in opposite directions. Therefore, when the rotating rod 73 swings up and down, the swing rod 710 moves in the opposite direction, so that the swing rod 710 always remains horizontal. The wind vane on the angle of attack sensor always remains horizontal under wind conditions. The proximity switch 711 is blocked by the wind vane. During the experiment, once the wind vane rotates slowly, the proximity switch 711 is triggered when it is no longer blocked by the wind vane. The proximity switch 711 feeds back an electrical signal to the controller 10. The controller 10 makes the alarm light 9 light up and alarm, indicating that the sensitivity of the angle of attack sensor wind vane is not up to standard. Step 3: When the angle of attack sensor needs to be replaced, lift the push plate 54. The push plate 54 slides upward along the outer wall of the first guide rod 52 and squeezes the spring 53. The guide groove 55 presses the guide post 57 forward at an angle, thereby causing the insertion rod 56 to move out of the slot 42. Pull the corner plate 41 to rotate 90 degrees, so that the drive mechanism 6 and the angle adjustment mechanism 7 can be moved out of the test box 2. Release the push plate 54. Under the elastic force of the spring 53, the push plate 54 descends. The guide groove 55 presses the guide post 57 backward at an angle. The insertion rod 56 is inserted into the slot 42 on the other side of the corner plate 41. The corner plate 41 closes the test box 2, and the angle of attack sensor replacement test can be carried out. This prevents the cold air in the test box 2 from escaping and heating up when the angle of attack sensor is replaced, keeps the test box 2 at a constant temperature, and allows the angle of attack sensor to be tested continuously, improving the testing efficiency. Step four: During the replacement of the angle of attack sensor, when the angle of attack sensor enters the hollow ring 761, it presses against the inclined surface of the clamping block 765, causing the clamping block 765 to move outward. At the same time, the traction rod 764 pulls the rotating ring 762 to rotate counterclockwise. After the angle of attack sensor enters the hollow ring 761, the rotating ring 762 rotates clockwise under the pulling force of the tension spring 763, and the traction rod 764 pulls the clamping block 765 to move inward, allowing the thermistor 767 to contact the side wall of the angle of attack sensor, and testing the temperature at different points of the angle of attack sensor.
[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A testing device for sensors, comprising a support (1), characterized in that, The test box (2) is fixedly connected to the top of the bracket (1). The front of the test box (2) is transparent, allowing observation of the interior. An air knife (3) and a rotating mechanism (4) are installed on the left and right sides of the test box (2), respectively. A positioning mechanism (5) is embedded in the right end of the front of the test box (2), which positions the rotating mechanism (4) after movement. A drive mechanism (6) is installed on the left side of the rotating mechanism (4), and an angle adjustment mechanism (7) is installed on the front of the drive mechanism (6). The test box (1) 2) A vertical plate (8) is installed on the top left front side. An alarm light (9) and a controller (10) are installed on the upper and lower ends of the front of the vertical plate (8). The alarm light (9) and the controller (10) are electrically connected. A fan (11) electrically connected to the controller (10) is installed on the upper surface of the test box (2). The air inlet and outlet of the fan (11) are connected to the rotating mechanism (4) and the air knife (3) through air pipes. Under the suction of the fan (11), gas is supplied to the air knife (3). The air knife (3) blows air horizontally from left to right. The rotating mechanism (4) includes a corner plate (41) connected to the top of the right side wall of the test box (2) by a pin. The corner plate (41) is right-angled. Slots (42) are provided at both ends of the front of the corner plate (41). The positioning mechanism (5) cooperates with the slots (42) to position the corner plate (41). A wind hood (43) is installed on the right side wall of the corner plate (41), and the wind hood (43) is connected to the air inlet of the fan (11) through an air pipe.
2. The testing device for sensors according to claim 1, characterized in that, The positioning mechanism (5) includes a box (51) embedded in the right side of the front of the test box (2). A first guide rod (52) is vertically installed in the inner cavity of the box (51). A spring (53) and a push plate (54) are respectively sleeved on the upper and lower ends of the outer wall of the first guide rod (52). The push plate (54) is pushed down by the elastic force of the spring (53). A guide groove (55) is opened on the rear side of the outer wall of the push plate (54). A plug rod (56) that can slide back and forth is inserted into the rear side of the box (51). The rear end of the plug rod (56) is inserted into the diagonal plate (41) in the slot (42) for positioning. The rear side of the plug rod (56) is triangular to facilitate the insertion of the plug rod (56) into the slot (42). A guide post (57) that is inserted into the inner cavity of the guide groove (55) is installed at the front end of the plug rod (56).
3. The testing device for sensors according to claim 2, characterized in that, The guide groove (55) is inclinedly distributed on the outer wall of the push plate (54).
4. The testing device for a sensor according to claim 3, characterized in that, The drive mechanism (6) includes a drive box (61) installed on the left side wall of the corner plate (41). A motor (62) electrically connected to the controller (10) is installed on the right side of the upper surface of the drive box (61). A rotating drum (63) is installed at the output end of the motor (62). A sliding groove (64) is provided on the outer wall of the rotating drum (63). A second guide rod (65) is vertically installed in the middle of the inner cavity of the drive box (61). A rack (66) that can slide up and down is sleeved on the outer wall of the second guide rod (65). 6) A pin (67) is installed on the right side wall and is inserted into the inner cavity of the slide groove (64). The pin (67) is cylindrical in shape. The pin (67) itself can slide smoothly in the slide groove (64) due to its curved surface. A first rotating shaft (68) is installed on the left side of the front of the drive box (61) through a bearing. A first spur gear (69) is installed at the rear end of the first rotating shaft (68) and meshes with the rack (66). When the rack (66) rises or falls, the first spur gear (69) drives the first rotating shaft (68) to rotate back and forth.
5. A testing device for sensors according to claim 4, characterized in that, The sluice (64) is elliptical and connected end to end on the outer wall of the rotating cylinder (63).
6. A testing apparatus for sensors according to claim 5, characterized in that, The angle adjustment mechanism (7) includes a second rotating shaft (71) connected to the front end of the first rotating shaft (68). A second spur gear (72) and a rotating rod (73) are respectively installed at the front and rear ends of the outer wall of the second rotating shaft (71). The second spur gear (72) is hidden inside the rotating rod (73). A third spur gear (74) is connected to the right side of the rotating rod (73) via a pin and meshes with the second spur gear (72). A fixing rod (75) is installed at the left end of the rotating rod (73). An installation assembly (76) is installed at the front end of the fixing rod (75). The installation assembly (76) is used to adjust the aircraft angle of attack sensor. The fixed rod (75) is fitted with a bushing (77) and a turntable (78) from front to back on its outer wall. The front of the turntable (78) is connected to the rear end of the bushing (77). The outer side of the front of the turntable (78) is connected to one end of a connecting rod (79) by a pin. The other end of the connecting rod (79) is connected to the outer side of the front of the third spur gear (74) by a pin. The connecting rod (79) enables the third spur gear (74) and the turntable (78) to move together. One end of a swing arm (710) is installed on the outer wall of the bushing (77). The other end of the swing arm (710) is installed with a proximity switch (711) that is electrically connected to the controller (10).
7. A testing device for sensors according to claim 6, characterized in that, The second spur gear (72) has the same shape as the third spur gear (74).
8. A testing device for sensors according to claim 7, characterized in that, The mounting assembly (76) includes a hollow ring (761) mounted on the front end of a fixed rod (75). The inner cavity of the hollow ring (761) is fitted with an aircraft angle of attack sensor. A rotatable rotating ring (762) is inserted into the inner cavity of the hollow ring (761). One end of a tension spring (763) is snapped onto the front of the rotating ring (762), and the other end of the tension spring (763) is snapped onto the inner wall of the hollow ring (761). Under the tension of the tension spring (763), the rotating ring (762) is pulled to rotate clockwise. Several traction pins are equidistantly mounted on the front of the rotating ring (762) along the circumferential direction. At one end of the guide rod (764), several clamping blocks (765) are inserted equidistantly along the circumferential direction on the inner wall of the hollow ring (761). A stop bar (766) is installed in the middle of the clamping block (765) to limit the movement distance of the clamping block (765). The other end of the traction rod (764) is sleeved on the outer wall of the stop bar (766). A thermistor (767) electrically connected to the controller (10) is embedded in the inner side of the clamping block (765). The resistance of the thermistor (767) is proportional to the temperature. Temperature is measured by the change of current of the thermistor (767).
9. A testing device for a sensor according to claim 8, characterized in that, The inner side of the front of the clamping block (765) is a bevel.
10. A testing method for a sensor, applied in a testing apparatus for a sensor as described in claim 9, characterized in that, Includes the following steps: S1. Clamp the aircraft angle of attack sensor onto the mounting assembly (76) so that the thermistor (767) contacts the side wall of the sensor; S2. Start the fan (11). The fan (11) draws in air through the rotating mechanism (4) and supplies air to the air knife (3). The air knife (3) blows air horizontally to simulate the airflow environment. At the same time, the condenser (12) is started to control the temperature of the test box (2) to simulate the temperature and humidity environment of the aircraft flight. S3. Start the drive mechanism (6), drive the angle adjustment mechanism (7) to drive the angle of attack sensor to swing, the swing arm (710) always stays horizontal, and detect the sensor wind vane response status through the proximity switch (711). If the wind vane swing lags behind the swing arm (710), the proximity switch (711) triggers the controller (10) to start the alarm light (9) to alarm. S4. Use the thermistor (767) on the mounting assembly (76) to perform multi-point synchronous temperature measurement on the angle of attack sensor, and obtain the temperature measurement data through the controller (10) to detect the heating uniformity of the sensor; S5. When replacing the sensor to be tested, operate the positioning mechanism (5) to release the positioning of the rotating mechanism (4), rotate the rotating mechanism (4) to move the driving mechanism (6) and the angle adjustment mechanism (7) out of the test box (2), and at the same time, the rotating mechanism (4) closes the test box (2). After the sensor replacement is completed, reverse the operation of the positioning mechanism (5), reset the rotating mechanism (4) and reposition it, and continue to perform sensor testing.