A measuring device and method for the retracting and extending parameters of a swinging mechanism

Abstract

The present invention discloses a device and method for measuring the retraction and extension parameters of an oscillating mechanism, belonging to the field of parameter measurement technology. The device comprises a timing module and a distance measurement module. The timing module includes a photoelectric switch A, a photoelectric switch B, a photoelectric switch C, and a timer. The oscillating mechanism includes a swinging rod. The light beams of photoelectric switches A and B abut the swinging end of the oscillating rod in the initial position, and the light beam of photoelectric switch C overlaps the swinging end of the oscillating rod in the final position. The swinging end of the oscillating rod is provided with a measuring hole for the light beam of photoelectric switch C to pass through. The distance measurement module includes a laser distance sensor A. The light beam of laser distance sensor A is emitted from the initial position to the final position. The method includes the following steps: S1, calculating the release time; S2, calculating the recovery time; and S3, calculating the amplitude and frequency. The use of non-contact light beam measurement not only achieves high measurement accuracy but also avoids the influence of magnetic fields, temperature, and vibration of the oscillating mechanism, reducing measurement errors and increasing service life.

Description

Technical Field

[0001] The present invention relates to the technical field of parameter measurement, and in particular to a device for measuring the retraction and extension parameters of a swing mechanism and a measuring method thereof. Background Art

[0002] The retraction and extension of the landing gear mainly depends on the swing mechanism, which usually includes a hydraulic spring actuator, a swing rod, a locking rocker arm and a connecting rod mechanism. Its working principle is as follows: the hydraulic system of the landing gear provides working pressure to the hydraulic spring actuator and the locking rocker arm at the same time. The locking rocker arm rotates from the locked position to the unlocked position to unlock the connecting rod mechanism. The hydraulic spring actuator compresses the internal spring under hydraulic drive. When the spring stores working kinetic energy, it drives the swing rod through the connecting rod mechanism from the "initial position" (i.e., the recovery state) to the "end position" (i.e., the lowering state), and then the external hydraulic pressure is removed. When the spring of the compression spring actuator is unloaded, the swing arm immediately rebounds from the "end position" to the "initial position". During this movement, the release time, recovery time, vibration frequency and vibration amplitude of the swing arm are important parameters that need to be measured. The release time is the time it takes for the swing end of the swing arm to move from the "initial position" to the "end position", and the recovery time is the time it takes for the swing end of the swing arm to return from the "end position" to the "initial position". The vibration frequency and vibration amplitude are the vibration frequency and vibration amplitude generated after the swing end of the swing arm is recovered to the "initial position" after the hydraulic system no longer provides hydraulic pressure.

[0003] Existing measurement methods typically use an inclinometer, which is fixed to a swinging rod via a mounting bracket. The release time, recovery time, vibration frequency, and vibration amplitude are obtained by measuring the change in the swinging rod's tilt angle relative to the horizontal plane. However, the inclinometer is easily affected by the external environment during measurement, resulting in insufficient measurement accuracy. For example, there are magnetization issues: electronic components are typically used inside the inclinometer, and these components may be affected by the magnetic field and produce angles, resulting in deviations in the measured angle; temperature changes: both excessively high and low temperatures may affect the sensitivity and accuracy of the inclinometer; and mechanical vibration: The static measurement accuracy of the inclinometer is generally high, but during dynamic measurement, due to differences in sensor performance, the measurement error is around ±0.5 degrees. Therefore, under the vibration of the swinging mechanism, the accuracy of the inclinometer's measurement results will be severely reduced. Long-term oscillations can also easily damage the internal components of the inclinometer, severely reducing the service life of the inclinometer. The system also has high maintenance and calibration costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and provide a device and method for measuring the retraction and extension parameters of a swing mechanism. By cooperating with a photoelectric switch and a laser ranging sensor, the retraction and extension parameters (amplitude, frequency, and retraction and extension time) of the swing rod in the swing mechanism can be effectively measured. This is a non-contact measurement technology that does not need to be installed on the swing mechanism, can completely avoid the vibration influence caused by the swing mechanism, and ensures the service life. In addition, the photoelectric switch and the laser ranging sensor use light beam measurement, which not only has high measurement accuracy, but is also not affected by magnetic fields and temperature.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention discloses a device for measuring the retraction and extension parameters of a swing mechanism, wherein the swing mechanism includes a swing rod capable of reciprocating from an initial position to an end position, and includes a timing module and a distance measurement module;

[0006] The timing module includes a photoelectric switch A, a photoelectric switch B, a photoelectric switch C, and a timer; the light beams of the photoelectric switches A and B are adjacent to the swing end of the swing rod at the initial position, the light beam of the photoelectric switch A is located behind the swing rod in the swing direction from the initial position to the final position, the light beam of the photoelectric switch B is located in front of the swing rod in the swing direction from the initial position to the final position, and the light beam of the photoelectric switch C coincides with the swing end of the swing rod at the final position. A measuring hole is provided on the swing end of the swing rod, and the measuring hole allows the light beam of the photoelectric switch C to pass through when the swing rod is in the final position. The timer is electrically connected to the photoelectric switches A, B, and C.

[0007] The ranging module includes a laser ranging sensor A. The light beam of the laser ranging sensor A is emitted from the initial position of the swing rod to the end position. The light beam of the laser ranging sensor A is parallel to the line connecting the photoelectric switch A and the photoelectric switch B. The light beam of the laser ranging sensor A passes through the center of the measuring hole at the initial position.

[0008] Preferably, the timing module also includes a laser ranging sensor B, the light beam of the laser ranging sensor B is emitted from the initial position of the swing rod to the end position, and the line connecting the centers of the measuring holes at the initial position and the end position coincides with the light beam of the laser ranging sensor B17.

[0009] Preferably, the aperture of the measuring hole is larger than the light beam of the photoelectric switch C, the light beam of the photoelectric switch C is located on the circumference of the swing path of the center of the measuring hole, and the light beam of the photoelectric switch C is in contact with the inner wall of the measuring hole at the end position away from the initial position.

[0010] Preferably, the swing mechanism is a swing mechanism on the landing gear, the hinged end of the swing rod is hinged on the landing gear column, the hinge axis of the hinged end of the swing rod is horizontally arranged, the initial position of the swing end of the swing rod is above the end position, and the light beam of the laser ranging sensor A is vertically downward.

[0011] Preferably, the swing mechanism also includes a hydraulic spring actuator and a lock rocker arm that can swing back and forth from a locked position to an unlocked position. The hydraulic spring actuator drives the swing rod through a connecting rod mechanism. The connecting rod mechanism realizes locking and unlocking by switching the lock rocker arm between a locked position and an unlocked position. The lock rocker arm and the hydraulic spring actuator are connected to the hydraulic system of the landing gear.

[0012] Preferably, the timing module further comprises a photoelectric switch D, the light beam of the photoelectric switch D is located on the swing path of the lock rocker arm, and the light beam of the photoelectric switch D coincides with the lock rocker arm in the locking position.

[0013] Preferably, the photoelectric switch A, the photoelectric switch B, the photoelectric switch C, the photoelectric switch D, the laser ranging sensor A and the laser ranging sensor B are all installed on a mounting fixture.

[0014] Also disclosed is a method for measuring the retraction and extension parameters of a swing mechanism, which uses the above-mentioned retraction and extension parameter measuring device of the swing mechanism, and includes the following steps:

[0015] S1. Release time calculation: The swing end of the swing rod is at the initial position. At this time, photoelectric switches A, B, and C are all on, driving the swing end of the swing rod to swing to the end position. When photoelectric switch B is off, the timer starts timing. When photoelectric switch C is off and turned on again, the timer stops timing.

[0016] S2. Calculate the recovery time; drive the swing end of the swing rod to the initial position. At this time, photoelectric switches A, B, and C are all in the on state. When photoelectric switch C is off, the timer starts timing. When photoelectric switch B is off and then turned on again, the timer stops timing.

[0017] S3. Calculation of vibration amplitude and vibration frequency. After the timer in step S2 stops, when the photoelectric switch B is disconnected for the first time and then turned on again, the timer starts timing and records the measurement value of the laser ranging sensor A and the number of times the photoelectric switch B and the photoelectric switch A are turned on and off respectively in real time. When the photoelectric switch B and the photoelectric switch A are both in the on state and no longer change, the timer stops timing and calculates the vibration frequency based on the recorded number of times and the recorded time. The real-time amplitude of the swing end of the swing rod is obtained based on the measurement value of the laser ranging sensor A.

[0018] Preferably, in step S1 and step S2, the rotation angle of the swing arm is measured in real time by a laser ranging sensor B.

[0019] Preferably, when the photoelectric switch D is in the off state, the lock rocker arm is located in the locked position, and when the photoelectric switch D is in the on state, the lock rocker arm is located in the unlocked position.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The present invention can measure the release time, recovery time, vibration frequency, vibration amplitude and other retraction parameters of the vibration mechanism of the swing rod through a photoelectric switch, a timer and a laser ranging sensor. There is no need to install the measuring device on the swing rod of the vibration mechanism to be measured. It is a non-contact measurement method. The vibration of the swing rod will not affect the measuring device, avoiding inaccurate measurement and damage caused by vibration. Photoelectric monitoring and laser ranging have high reliability, high precision and strong anti-interference ability when measuring the motion parameters of the swing rod. They are not affected by temperature and magnetic field, have a long service life and the device will not be damaged due to frequent experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a side structural schematic diagram of the swing mechanism retraction and extension parameter measurement device;

[0024] Figure 2 This is a front view structural diagram of the swing mechanism retraction and extension parameter measurement device;

[0025] Figure 3 This is the principle diagram of amplitude and frequency detection.

[0026] Explanation of the accompanying symbols: 1. Swing arm; 2. Hydraulic spring actuator; 3. Lock rocker arm; 4. Connecting rod mechanism; 5. Landing gear column; 6. Measuring hole; 7. Installation tool; 8. Photoelectric switch A transmitting part; 9. Photoelectric switch A receiving part; 10. Photoelectric switch B transmitting part; 11. Photoelectric switch B receiving part; 12. Photoelectric switch C transmitting part; 13. Photoelectric switch C receiving part; 14. Photoelectric switch D transmitting part; 15. Photoelectric switch D receiving part; 16. Laser ranging sensor A; 17. Laser ranging sensor B. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides a swing mechanism retraction and extension parameter measurement device, which is mainly used to measure the retraction and extension parameters of the swing mechanism. The swing mechanism should be understood as a swing mechanism in a broad sense, that is, it can be a swing mechanism on an aircraft landing gear or a swing mechanism on other devices, such as Figures 1 to 3 As shown, the swing mechanism includes a swing rod 1, which can swing from an initial position to an end position and then swing back to the initial position from the end position. The measuring device mainly includes a timing module and a distance measurement module.

[0030] The timing module includes a photoelectric switch A, a photoelectric switch B, a photoelectric switch C and a timer, and the timer (not shown) is electrically connected to the photoelectric switch A, the photoelectric switch B and the photoelectric switch C. The photoelectric switch A, the photoelectric switch B, the photoelectric switch C and the timer are used to measure the release time and the recovery time of the swing rod 1. The photoelectric switch A, the photoelectric switch B and the photoelectric switch C are each composed of a light beam emitting part and a light beam receiving part. The light beam emitting part emits a light beam to the light beam receiving part. When the light beam receiving part receives the light beam, the photoelectric switch is in the on state. If the light beam is blocked and the light beam receiving part cannot receive the light beam, the photoelectric switch is in the off state. Therefore, the photoelectric switch A emitting part 8 and the photoelectric switch A receiving part 9 of the photoelectric switch A, the photoelectric switch B emitting part 10 and the photoelectric switch B receiving part 11 of the photoelectric switch B, and the photoelectric switch C emitting part 12 and the photoelectric switch C receiving part 13 of the photoelectric switch C are all located on both sides of the swing rod 1, that is, the light beams of the photoelectric switches A, the photoelectric switch B and the photoelectric switch C are all perpendicular to the swing plane of the swing rod 1.

[0031] The light beams emitted by both photoelectric switches A and B are adjacent to the swinging end of swinging rod 1 in its initial position. The light beam of photoelectric switch A is located behind swinging rod 1 in the direction of its swing from the initial position to the final position, while the light beam of photoelectric switch B is located in front of it in the direction of its swing from the initial position to the final position. That is, when swinging rod 1 is in its initial position, it is located between the light beams of photoelectric switch A and photoelectric switch B. The swinging end of swinging rod 1 aligns with the light beams emitted by both photoelectric switches A and B without blocking them, ensuring that both switches A and B are in the on state. The light beam of photoelectric switch C overlaps with the swinging end of swinging rod 1 in its final position. A measuring hole 6 is provided on the swinging end of swinging rod 1, allowing the light beam of photoelectric switch C to pass through when swinging rod 1 is in its final position. In other words, without the measuring hole 6, the swinging end of swinging rod 1 in its final position would block the light beam emitted by the transmitting portion 12 of photoelectric switch C. However, with the measuring hole 6 opened, the light beam can be effectively received by the receiving portion 13 of photoelectric switch C.

[0032] The distance measurement module includes a laser distance sensor A16. The light beam of laser distance sensor A16 is emitted from the initial position of swing arm 1 to the final position. The light beam of laser distance sensor A16 is parallel to the line connecting photoelectric switch A and photoelectric switch B. In other words, the line connecting photoelectric switch A's transmitting unit 8 and photoelectric switch B's transmitting unit 10 is parallel to the light beam of laser distance sensor A16. At the same time, the light beam of laser distance sensor A16 passes through the center of measuring hole 6 of swing arm 1 at the initial position. The vibration frequency and amplitude of swing arm 1 are measured by laser distance sensor A16.

[0033] Measuring principle:

[0034] ① Release time (measure the time it takes for the swing end of the swing rod 1 to move from the initial position to the final position):

[0035] Before the start, when the swing end of the swing rod 1 is at the initial position, photoelectric switch A, photoelectric switch B, and photoelectric switch C are all in the on state. Then, when the swing end of the swing rod 1 swings to the end position, it will first pass through photoelectric switch B and then move to photoelectric switch C. After passing through the photoelectric switch B, it enters between the transmitting part 10 of the photoelectric switch B and the receiving part 11 of the photoelectric switch B, blocking the light beam emitted by the transmitting part 10 of the photoelectric switch B. The receiving part 11 of the photoelectric switch B cannot receive the light beam, causing the photoelectric switch B to be in the off state. At this time, the timer will start automatically timing. Subsequently, the swinging end of the swinging rod 1 leaves between the transmitting part 10 of the photoelectric switch B and the receiving part 11 of the photoelectric switch B. The light beam emitted by the transmitting part 10 of the photoelectric switch B is received by the receiving part 11 of the photoelectric switch B again, and the photoelectric switch B is in the on state. As the swinging end of the swinging rod 1 continues to rotate, it will pass through the photoelectric switch C. The light beam of the photoelectric switch C will first be blocked and disconnected by the swinging end of the swinging rod 1, and then pass through the measuring hole 6 on the swinging end of the swinging rod 1 to be turned on again. When the photoelectric switch C is turned on again, the timer automatically stops timing. The time recorded by the timer at this time is the release time.

[0036] ② Recovery time (measure the time it takes for the swing end of the swing rod 1 to move from the final position to the initial position):

[0037] Before swinging back, the swing end of swing rod 1 is at the end position. At this time, photoelectric switches A, B, and C are all on. When the swing end of swing rod 1 swings back to the initial position, it will first move away from photoelectric switch C and then pass by photoelectric switch B. When moving away from photoelectric switch C, measuring hole 6 will first deviate from photoelectric switch C, then the swing end of swing rod 1 will block photoelectric switch C, and finally move away from photoelectric switch C. Therefore, photoelectric switch C will first be disconnected and then turned on. When photoelectric switch C is disconnected, the timer starts. Then, as swing rod 1 swings, the light beam of photoelectric switch B is first blocked and then passes freely. In other words, photoelectric switch B is first disconnected and then turned on. When photoelectric switch B is turned on again, the timer stops. The time recorded by the timer is the recovery time.

[0038] ③Vibration frequency (number of vibrations of the swing end of the swing rod 1 per unit time):

[0039] After the timer stops timing during the swinging process of the swinging rod 1, the swinging process will generate vibrations, so the swinging rod 1 will swing back and forth between the photoelectric switch B and the photoelectric switch A, and will pass back and forth between the photoelectric switch B and the photoelectric switch A. The photoelectric switch B and the photoelectric switch A will be intermittently opened and closed. Therefore, according to the number of times the photoelectric switch B and the photoelectric switch A are opened and closed, combined with the final stop time, the number of vibrations of the swinging end of the swinging rod 1 per unit time is calculated to obtain the vibration frequency. The initial time of the stop time is the node where the timer starts timing again after the first time it stops timing during the swinging process of the swinging rod 1. This timing node is when the photoelectric switch B is turned on again after the first time it is turned off. The end time of the stop time is the node where the timer stops timing again. This timing node is when the photoelectric switch B and the photoelectric switch A are both in the on state and no longer change, that is, when the swinging end of the swinging rod 1 stops between the photoelectric switch B and the photoelectric switch A.

[0040] ④ Vibration amplitude: It is mainly obtained by converting the distance between the swing end of the swing rod 1 and the laser distance sensor A16. Because the swing end of the swing rod 1 reciprocates between the photoelectric switch A and the photoelectric switch B, the distance between the swing end of the swing rod 1 and the laser distance sensor A16 will also change periodically. Therefore, the vibration amplitude of the swing rod 1 will also change periodically. As time passes, the vibration energy of the swing rod 1 will gradually weaken. Therefore, the vibration amplitude of the swing end of the swing rod 1 will gradually decrease until it disappears completely. The vibration amplitude change process can be plotted as a curve, as shown in the figure below. Figure 3 The upper part of the curve, the maximum and minimum values, are the maximum vibration amplitudes. Figure 3 The lower half shows the periodic on / off changes of photoelectric switches A and B. Laser ranging sensor A16 cannot directly measure the amplitude of swing rod 1; conversion is required. First, the distance between the swing end of swing rod 1 in its initial position and laser ranging sensor A16 is used as the initial distance. The vibration amplitude is then calculated by subtracting the initial distance from the measured detection distance.

[0041] The use of light beams to non-contactly measure the retraction and extension parameters not only has high measurement accuracy, but also avoids the influence of magnetic fields, temperature and vibration of the swing mechanism, reduces measurement errors and increases service life.

[0042] Furthermore, in this embodiment, if Figures 1 to 3 As shown, the timing module also includes a laser ranging sensor B17. Its beam is directed from the initial position of the swinging rod 1 to the final position. The line connecting the centers of the measuring holes 6 at the initial and final positions coincides with the beam of laser ranging sensor B17. Laser ranging sensor B17 can measure and calculate the rotation angle of the swinging rod 1, thereby obtaining retraction and extension parameters in addition to amplitude, frequency, and retraction time.

[0043] Measuring principle:

[0044] ⑤ Rotation angle: With the swing arm 1 at the initial or final position as the fixed side, when the swing arm 1 rotates to any position between the initial and final positions, the swing arm 1 and the swing arm 1 at the initial or final position can form a triangle. Because the length of the swing arm 1 is known, two sides of the triangle are fixed. The laser ranging sensor B17 can measure the distance a between the swing end of the swing arm 1 and the position of any point when switching between the initial and final positions and the laser ranging sensor B17. The distance b from the swing arm 1 at the final position to the laser ranging sensor B17 is then calculated by subtracting a from b to obtain the length of the third side of the triangle. Using the lengths of the three sides of the triangle, the rotation angle of the swing arm 1 can be calculated.

[0045] Furthermore, in this embodiment, Figures 1 to 3 As shown in FIG, the aperture of the measuring hole 6 is larger than the light beam of the photoelectric switch C, which facilitates the light beam of the photoelectric switch C to pass through. The light beam of the photoelectric switch C is located on the circumference of the swing path of the center of the measuring hole 6. When the swing end of the swing rod 1 is at the end position, the inner wall of the measuring hole 6 on the swing rod 1 away from the initial position is aligned with the light beam of the photoelectric switch C, that is, the light beam of the photoelectric switch C just passes through the measuring hole 6. Figure 1 For example, the lower edge of the inner wall of the measuring hole 6 is aligned with the light beam of the photoelectric switch C. When the swing rod 1 rotates, the light beam of the photoelectric switch C just coincides with the inner wall of the measuring hole 6 away from the initial position, the timer stops, and the swing end of the swing rod 1 also reaches the end position. The purpose of this setting is to reduce the timing error, because the light beam of the photoelectric switch C passes through the center of the measuring hole 6 or the inner wall of the measuring hole 6 close to the initial position (with Figure 1 For example, if the upper edge of the measuring hole 6 is used as the timer to stop timing, an angle error will occur relative to the angle of the center of the circle. For example, when the diameter of the measuring hole 6 is 2 cm, the angle error is 0.5° to 1°, which will lead to timing errors.

[0046] In this embodiment, Figures 1 to 3 As shown, the swing mechanism is that of the landing gear. The hinged end of the swing lever 1 is hinged to the landing gear column 5. The hinge axis of the swing lever 1 is horizontal, and the initial position of the swing end of the swing lever 1 is above the final position. The beam of the laser ranging sensor A16 points vertically downward. The corresponding photoelectric switches A and B are arranged vertically, and the laser ranging sensor B17 is tilted downward. The release time and recovery time measured in the retraction and extension parameters are the lowering time and the raising time.

[0047] The above describes the measurement setup for a swing mechanism used on landing gear. If the swing mechanism is used on other equipment, the measurement setup will need to be adjusted accordingly. For example, if the landing gear column 5 is replaced with a horizontally positioned bar bracket and the pivot axis of the swing arm 1 is vertically positioned, the corresponding laser rangefinder A16 beam is parallel to the bar bracket, the laser rangefinder B17 is tilted horizontally, and the photoelectric switches A and B are positioned horizontally.

[0048] The swing mechanism is used as the retractable device of the landing gear. In this embodiment, Figures 1 to 3 As shown, the swing mechanism also includes a hydraulic spring actuator 2 and a locking rocker arm 3. The hydraulic spring actuator 2 drives the swing rod 1 to swing through the connecting rod mechanism 4. The locking rocker arm 3 is used to lock the connecting rod mechanism 4. The locking rocker arm 3 can swing back and forth from the locked position to the unlocked position. When the locking rocker arm 3 swings to the locked position, it locks the column connecting rod mechanism 4. At this time, the hydraulic spring actuator 2 cannot drive the connecting rod mechanism 4. When the locking rocker arm 3 swings to the unlocked position, it will be unlocked. At this time, the hydraulic spring actuator 2 can drive the connecting rod mechanism 4, and then drive the swing rod 1. The locking rocker arm 3 and the hydraulic spring actuator 2 are both connected to the hydraulic system of the landing gear, and the hydraulic system provides hydraulic power to the locking rocker arm 3 and the hydraulic spring actuator 2.

[0049] Furthermore, in this embodiment, Figures 1 to 3 As shown, the timing module also includes a photoelectric switch D. The light beam of the photoelectric switch D is located in the swing path of the lock rocker arm 3 and overlaps with the lock rocker arm 3 in the locked position. Specifically, the photoelectric switch D includes a photoelectric switch D transmitter 14 and a photoelectric switch D receiver 15. The photoelectric switch D transmitter 14 and the photoelectric switch D receiver 15 are located on either side of the lock rocker arm 3. The light beam between the photoelectric switch D transmitter 14 and the photoelectric switch D receiver 15 is perpendicular to the rotation plane of the lock rocker arm 3. When the lock rocker arm 3 rotates to the locked position, it rotates between the photoelectric switch D transmitter 14 and the photoelectric switch D receiver 15, thereby blocking the light beam. The photoelectric switch D is in the off state, indicating that the lock rocker arm 3 is in the locked position. As the lock rocker arm 3 moves from the locked position to the unlocked position, the light beam of the photoelectric switch D gradually clears the blockage of the lock rocker arm 3. When the photoelectric switch D is in the on state, it indicates that the lock rocker arm 3 is unlocked.

[0050] In this embodiment, Figures 1 to 3As shown, photoelectric switch A, photoelectric switch B, photoelectric switch C, photoelectric switch D, laser rangefinder A16, and laser rangefinder B17 are all mounted on mounting fixture 7. Mounting fixture 7 can be mounted directly on landing gear column 5 or fixed elsewhere on the landing gear. Mounting fixture 7 is preferably a portal frame. Photoelectric switch A transmitter 8, photoelectric switch B transmitter 10, photoelectric switch C transmitter 12, and photoelectric switch D transmitter 14 are located on the same side arm of the portal frame. Photoelectric switch A receiver 9, photoelectric switch B receiver 11, photoelectric switch C receiver 13, and photoelectric switch D receiver 15 are located on the other side arm of the portal frame.

[0051] In this embodiment, Figures 1 to 3 As shown, the cold light sources of photoelectric switch A, photoelectric switch B, photoelectric switch C, and photoelectric switch D can be infrared light, red light, green light, blue light, etc., with infrared light being preferred.

[0052] Example 2

[0053] This embodiment provides a method for measuring the retraction and extension parameters of a swing mechanism, using the apparatus for measuring the retraction and extension parameters of a swing mechanism in Example 1. Figures 1 to 3 As shown, the following steps are included:

[0054] S1. Release time calculation: First, the swing end of swing rod 1 is at the initial position. At this time, photoelectric switches A, B, and C are all on. Then, the swing end of swing rod 1 is driven to swing to the end position. When photoelectric switch B is off, the timer starts. When photoelectric switch C is off and then turned on again, it means that the swing end of swing rod 1 has reached the end position, and the timer ends. The time recorded by the timer is the release time.

[0055] S2. Calculation of recovery time: The swing end of the swing rod 1 is driven to swing toward the initial position. Before the swing, photoelectric switches A, B, and C are all turned on. When photoelectric switch C is turned off during the swing, the timer starts. When photoelectric switch B is turned off and then turned on again, it means that the swing end of the swing rod 1 has returned to the initial position, and the timer ends. The time recorded by the timer is the recovery time.

[0056] S3. Calculation of vibration amplitude and vibration frequency: After the timer in step S2 stops, when photoelectric switch B is disconnected for the first time and then turned on again, the timer starts to count, and the measurement value of laser distance sensor A16 and the number of times photoelectric switch B and photoelectric switch A are turned on and off are recorded in real time. When photoelectric switch B and photoelectric switch A are both in the on state and no longer change, it means that the swing rod 1 is located between the light beams of photoelectric switch B and photoelectric switch A and no longer swings. The timer is stopped, and the vibration frequency is calculated based on the recorded number of times and the recorded time. The real-time vibration amplitude of the swing end of the swing rod 1 is obtained based on the measurement value of laser distance sensor A16. Laser distance sensor A16 cannot directly measure the amplitude of the swing rod 1, and conversion is required. First, the distance between the swing end of the swing rod 1 at the initial position and laser distance sensor A16 is used as the initial distance, and then the vibration amplitude is obtained by subtracting the initial distance from the measured detection distance.

[0057] Furthermore, in this embodiment, Figures 1 to 3 As shown, a device for measuring the retraction and extension parameters of a swing mechanism employs a ranging module including a laser ranging sensor B17. In steps S1 and S2, the laser ranging sensor B17 measures the rotation angle of the swing lever 1 in real time. The rotation angle is also not directly measured by the laser ranging sensor B17 and requires conversion. For details on this conversion, refer to the principle of rotation angle (5) in Example 1 and will not be repeated here.

[0058] Furthermore, in this embodiment, Figures 1 to 3 As shown, a timing module is used to measure the retraction and extension parameters of the swing mechanism, including a photoelectric switch D. When the photoelectric switch D is in the off state, the lock rocker arm 3 is in the locked position, and when the photoelectric switch D is in the on state, the lock rocker arm 3 is in the unlocked position.

[0059] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for measuring the retraction and extension parameters of a swing mechanism, applied to a device for measuring the retraction and extension parameters of a swing mechanism, wherein the swing mechanism comprises a swing rod capable of reciprocating from an initial position to an end position, characterized in that: The swing mechanism retraction and extension parameter measurement device includes a timing module and a distance measurement module; The timing module includes a photoelectric switch A, a photoelectric switch B, a photoelectric switch C, and a timer; the light beams of the photoelectric switches A and B are adjacent to the swing end of the swing rod at the initial position, the light beam of the photoelectric switch A is located behind the swing rod in the swing direction from the initial position to the final position, the light beam of the photoelectric switch B is located in front of the swing rod in the swing direction from the initial position to the final position, and the light beam of the photoelectric switch C coincides with the swing end of the swing rod at the final position. A measuring hole is provided on the swing end of the swing rod, and the measuring hole allows the light beam of the photoelectric switch C to pass through when the swing rod is in the final position. The timer is electrically connected to the photoelectric switches A, B, and C. The distance measuring module includes a laser distance measuring sensor A. The light beam of the laser distance measuring sensor A is emitted from the initial position of the swing rod to the end position. The light beam of the laser distance measuring sensor A is parallel to the line connecting the photoelectric switch A and the photoelectric switch B. The light beam of the laser distance measuring sensor A passes through the center of the measuring hole at the initial position. The method for measuring the retraction and extension parameters of the swing mechanism comprises the following steps: S1. Release time calculation: The swing end of the swing rod is at the initial position. At this time, photoelectric switches A, B, and C are all on, driving the swing end of the swing rod to swing to the end position. When photoelectric switch B is off, the timer starts timing. When photoelectric switch C is off and turned on again, the timer stops timing. S2. Calculate the recovery time; drive the swing end of the swing rod to the initial position. At this time, photoelectric switches A, B, and C are all in the on state. When photoelectric switch C is off, the timer starts timing. When photoelectric switch B is off and then turned on again, the timer stops timing. S3. Calculation of vibration amplitude and vibration frequency. After the timer in step S2 stops, when the photoelectric switch B is disconnected for the first time and then turned on again, the timer starts timing and records in real time the measurement value of the laser ranging sensor A and the number of times the photoelectric switch B and the photoelectric switch A are turned on and off respectively. When both the photoelectric switch B and the photoelectric switch A are in the on state and no longer change, the timer stops timing and calculates the vibration frequency based on the recorded number of times and the recorded time. The real-time vibration amplitude of the swing end of the swing rod is obtained based on the measurement value of the laser ranging sensor A.

2. A method for measuring the retraction and extension parameters of a swing mechanism according to claim 1, characterized in that: The timing module also includes a laser ranging sensor B, the light beam of which is emitted from the initial position of the swing rod to the final position, and the line connecting the centers of the measuring holes at the initial position and the final position coincides with the light beam of the laser ranging sensor B.

3. A method for measuring the retraction and extension parameters of a swing mechanism according to claim 2, characterized in that: The aperture of the measuring hole is larger than the light beam of the photoelectric switch C. The light beam of the photoelectric switch C is located on the circumference of the swing path of the center of the measuring hole. The light beam of the photoelectric switch C is in contact with the inner wall of the measuring hole at the end position away from the initial position.

4. A method for measuring the retraction and extension parameters of an oscillating mechanism according to claim 2 or 3, characterized in that: The swing mechanism is a swing mechanism on the landing gear, the hinged end of the swing rod is hinged on the landing gear column, the hinge axis of the hinged end of the swing rod is horizontally arranged, the initial position of the swing end of the swing rod is above the end position, and the light beam of the laser ranging sensor A is vertically downward.

5. A method for measuring the retraction and extension parameters of a swing mechanism according to claim 4, characterized in that: The swing mechanism also includes a hydraulic spring actuator and a lock rocker arm that can swing back and forth from a locked position to an unlocked position. The hydraulic spring actuator drives the swing rod through a connecting rod mechanism. The connecting rod mechanism realizes locking and unlocking by switching the lock rocker arm between a locked position and an unlocked position. The lock rocker arm and the hydraulic spring actuator are connected to the hydraulic system of the landing gear.

6. A method for measuring the retraction and extension parameters of a swing mechanism according to claim 5, characterized in that: The timing module further includes a photoelectric switch D, the light beam of the photoelectric switch D is located on the swing path of the lock rocker arm, and the light beam of the photoelectric switch D coincides with the lock rocker arm in the locking position.

7. A method for measuring the retraction and extension parameters of an oscillating mechanism according to claim 6, characterized in that: The photoelectric switch A, the photoelectric switch B, the photoelectric switch C, the photoelectric switch D, the laser ranging sensor A, and the laser ranging sensor B are all installed on a mounting fixture.

8. The method for measuring the retraction and extension parameters of a swing mechanism according to claim 2, characterized in that: The rotation angle of the swing arm is measured in real time by the laser ranging sensor B.

9. A method for measuring the retraction and extension parameters of a swing mechanism according to claim 6, characterized in that: When the photoelectric switch D is in the off state, the lock rocker arm is located in the locked position, and when the photoelectric switch D is in the on state, the lock rocker arm is located in the unlocked position.

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