A method for detecting the state of an actuating cylinder by using a special-shaped magnetic conductive target and a proximity signal device
By combining an irregularly shaped magnetic target with a proximity signal, and using an angle position detection method, the problems of spatial coordination and critical point control in actuator detection are solved, and accurate detection in a limited space is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUI ZHOU LONG FEI HANG KONG FU JIAN YOU XIAN GONG SI
- Filing Date
- 2023-11-30
- Publication Date
- 2026-06-16
AI Technical Summary
Existing proximity signals have problems such as high spatial coordination requirements, inconsistent detection methods, and difficulty in controlling the critical point when detecting the status of the actuator. In particular, when the space of the actuator structure is limited, it is difficult to effectively detect the position status of the actuator.
By combining an irregularly shaped magnetic target with a proximity signal, and using angular position detection, the relative position change of the irregularly shaped magnetic target and the proximity signal is utilized to design an end-point switch indicator mechanism, ensuring convenient gap adjustment and minimizing the sensing area during connection and disconnection.
It enables accurate detection of the actuator's position status within a limited space, reducing the requirements for installation space, simplifying the debugging process, and avoiding misjudgments of the connection and disconnection critical points.
Smart Images
Figure CN117382907B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aircraft structural design technology, specifically to a method for detecting the state of an actuator using a non-circular magnetic target and a proximity signal. Background Technology
[0002] On aircraft, the actuator is a very common and important drive component. Whether the actuator moves correctly directly affects the aircraft's operation. To detect whether the actuator has moved correctly, a termination switch is usually installed on it. Currently, the termination switch generally uses the GE-59A series proximity signal. The proximity signal is based on the principle of magnetic induction. The magnetic induction sensor in the proximity signal detects the parameter changes caused by the approach of an external magnetically conductive object, sensing the distance change of the detected target. The internal signal processing circuit converts the changes in the magnetic element parameters into changes in the approach state of the detected target, outputting a corresponding signal (position signal) for use by the control circuit. The GE-59A series proximity signal has an effective detection distance of approximately 0.5–3 mm for magnetically conductive objects, with high detection sensitivity in the range of 0.5–2 mm. Therefore, the set distance for axial proximity detection is usually 0.5–2 mm. The detection mechanism of the proximity signal is generally installed outside the actuator and driven by the piston rod of the actuator. Existing proximity signal detection methods include axial displacement detection, radial displacement detection, angular position detection, and speed measurement conversion detection. Figure 1 The principle diagram of the detection method is shown.
[0003] According to the functional requirements of the actuator, a positioning signal needs to be given after the actuator is retracted to its final position. Since the actuator operates on a linear reciprocating motion, to track the positioning status of the actuator, the above four detection methods (corresponding to...) are used. Figure 1 An analysis of the advantages and disadvantages of the ad graph (in the example) is conducted, and the specific analysis is as follows:
[0004] a) Axial displacement detection more directly reflects the movement of the actuator. When the proximity signal is fixed, the magnetic target needs to move axially with the piston rod of the actuator in order to achieve axial displacement detection. However, the working stroke of the actuator is long, and the axial displacement stroke of the magnetic target is also long. Therefore, the actuator requires a large amount of space after installation. After installation, the position of the magnetic target needs to be adjusted according to the intersection size of each aircraft. This detection method has high requirements for the coordination of aircraft space and is not adopted.
[0005] b) The radial displacement detection method is inconsistent with the actuator cylinder's retraction and extension motion method, and therefore will not be adopted.
[0006] c) The speed measurement and detection method is inconsistent with the actuator cylinder's retraction and extension motion method, and therefore will not be adopted.
[0007] d) While the angle position detection method cannot directly reflect the movement of the actuator cylinder, it can achieve angle position detection by pressing an eccentric shaft to rotate after the linear movement reaches its position. The shaft then drives the magnetic target to rotate. This method requires little space, which is beneficial for the coordination of the installation space. Furthermore, it eliminates the need for field debugging, hence its adoption. However, this detection method requires the design of different cams based on the rotatable angle and radius of the product being detected. Due to space limitations, the critical points for starting to connect and disconnect are difficult to control. In one case, a UAV wheel-mounted status monitoring system using this structure experienced a failure to connect after reaching the designated position.
[0008] Due to the limited space in the actuator cylinder structure, the rotation angle of the magnetic target is limited. If a regular umbrella-shaped cam is used, the radius of curvature of the umbrella-shaped cam needs to be very large if the required connection gap is to be guaranteed. However, the structure does not meet the space requirements. Therefore, it is necessary to design an end-point switch indicator mechanism to solve the above problems. Summary of the Invention
[0009] To address the aforementioned problems, the present invention aims to provide a method for detecting the state of an actuator cylinder using a non-circular magnetic target and a proximity signal. Through this auxiliary connection mechanism, when the proximity signal is connected, the sensing area of the magnetic target and the proximity signal is ensured, and the gap is easily adjustable. When the proximity signal is disconnected, the disconnection gap is ensured, and the sensing area is minimized.
[0010] The objective of this invention is achieved through the following technical solutions:
[0011] A method for detecting the state of an actuator cylinder using a non-circular magnetic target and a proximity signal includes the following steps:
[0012] S1. Determine the detection method: Use the angle position detection method, that is, rotate the magnetic target in the forward or reverse direction to make the magnetic target move closer to or away from the proximity signal, so that the proximity signal is turned on or off.
[0013] S2. Determination of the connection and disconnection gaps: When the gap between the magnetic target and the proximity signal is less than or equal to 0.5 mm, the proximity signal is connected; when the gap between the magnetic target and the proximity signal is greater than 4 mm, the proximity signal is disconnected.
[0014] S3. Installation of the endpoint switch indicator mechanism: The endpoint switch indicator mechanism includes an actuator, an end cover, a proximity signal, a rotating shaft, a magnetic target, a return lever, a return spring, and a lever; the end cover is detachably connected to the tail end of the actuator, and when the piston rod inside the actuator retracts to its position, the tail end of the piston rod can extend into the end cover; the proximity signal is detachably connected to the side of the end cover; the rotating shaft is rotatably installed inside the end cover along the diameter direction of the end cover, and both ends of the rotating shaft extend outside the end cover; the magnetic target has an irregular structure and is fixed to one end of the rotating shaft, the magnetic target corresponds to the detection end face of the proximity signal and can move closer to or away from the proximity signal under the drive of the rotating shaft; the return lever is fixed to the other end of the rotating shaft; the two ends of the return spring are respectively fixed to the return lever and the end cover; the lever is set inside the end cover and fixed in the middle of the rotating shaft, directly opposite the tail end of the piston rod.
[0015] S4. Installation and Position Adjustment of the Magnetic Target:
[0016] During the installation of the magnetic target, the gap of the actuator cylinder is eliminated under working pressure before the magnetic target is installed, so that the connection gap is close to the detection sensitivity range of the signal device.
[0017] S5. Arrival Status Detection:
[0018] When the piston rod inside the actuator retracts, the tail end of the piston rod moves linearly and strikes the dial block. The dial block rotates around the rotating shaft, which in turn drives the magnetic target to rotate. When the magnetic target rotates to the proximity signal's detection sensitivity range, the proximity signal is activated.
[0019] When the piston rod inside the actuator extends, the tail end of the piston rod moves linearly away from the dial, the return spring resets and drives the rotating shaft to rotate in the opposite direction. The rotation of the rotating shaft then drives the dial and the magnetic target to rotate in the opposite direction and reset. When the magnetic target rotates to outside the detection sensitivity range of the proximity signal, the proximity signal is disconnected.
[0020] Furthermore, when the rotating shaft drives the magnetic target close to the detection end face of the proximity signal, the return lever pulls the return spring to extend. The return spring stretches and stores energy. When the piston rod extends from the actuator cylinder, the paddle block loses the obstruction of the piston rod. The return spring contracts and resets, pulling the return lever to reset, causing the rotating shaft to rotate. The rotating shaft drives the paddle block and the magnetic target to reset. The magnetic target moves away from the detection end face of the proximity signal, and the proximity signal disconnects.
[0021] Furthermore, the magnetic target has an irregular shape. The magnetic target is composed of a mounting cylinder and an irregular block. The mounting cylinder is fixed outside the rotating shaft and located on the side of the detection end face of the proximity signal. The irregular block is fixed on the outer wall of the mounting cylinder and located between the mounting cylinder and the detection end face of the proximity signal. The irregular block has a sensing end face on the side facing the detection end face of the proximity signal. The sensing end face can move closer to or away from the detection end face of the proximity signal under the action of the magnetic target, so that the proximity signal is turned on or off.
[0022] Furthermore, when the irregularly shaped block approaches the proximity signal and activates the proximity signal, the surface of the irregularly shaped block closest to the proximity signal becomes the sensing end surface. At this time, the distance between the sensing end surface and the proximity signal is less than or equal to 0.5 mm. When the irregularly shaped block moves away from the proximity signal and deactivates the proximity signal, the distance between the surface of the irregularly shaped block closest to the proximity signal and the proximity signal is greater than 4 mm.
[0023] Preferably, when the proximity signal is activated, the sensing end face is parallel to the detection end face of the proximity signal, and the sensing area between the sensing end face and the proximity signal is maximized. With this setting, it is less likely that the proximity signal will not be activated after the target position is reached.
[0024] Preferably, when the sensing end face is parallel to the detection end face of the proximity signal, the sensing end face is directly opposite the detection end face of the proximity signal, and the area of the sensing end face is greater than or equal to the area of the detection end face of the proximity signal.
[0025] Furthermore, the mounting sleeve is mounted on the rotating shaft and fixed to the rotating shaft by a fixing screw assembly. The fixing screw assembly includes a bolt and a nut. The bolt shank penetrates the rotating shaft from one side of the mounting sleeve and then exits from the other side of the mounting sleeve, and is threaded onto the nut. Tightening the nut fixes the mounting sleeve to the rotating shaft.
[0026] Furthermore, the irregularly shaped block rotates in the forward direction so that the rotation angle when the proximity signal is turned on is 15-45°; the irregularly shaped block rotates in the reverse direction so that the rotation angle when the proximity signal is turned off is 15-45°.
[0027] Furthermore, the end cap is threadedly connected to the tail end of the actuator cylinder.
[0028] Furthermore, the proximity signal is connected to a pre-set mounting bracket on the outer wall of the end cap by means of a threaded connection. The mounting bracket is fixed on the outer wall of the end cap and has a threaded hole thereon. The proximity signal is fitted into the threaded hole and threadedly connected to it, which facilitates the adjustment of the distance between the proximity signal and the magnetic target during the installation and testing process.
[0029] Furthermore, in order to facilitate the adjustment of the axial installation position of the end switch, an ear plate is installed at the tail end of the end cover. The ear plate is sleeved on a pre-set shaft inside the aircraft body and can move back and forth along the shaft. Locking nuts with threads connected to the shaft are provided on both sides of the ear plate.
[0030] The endpoint switch indicator mechanism of this invention requires little movement space and does not require designing different magnetic targets based on the rotation angle and radius of the product being tested. It is also easier to control the critical points for starting to connect and disconnect. Based on the structural dimensions and rotation angle characteristics of the actuator cylinder, this invention designs the magnetic target into an irregular shape. When the proximity signal is connected, it ensures both the sensing area between the magnetic target and the proximity signal and the gap can be easily adjusted. When the proximity signal is disconnected, it ensures both the disconnection gap and minimizes the sensing area. Attached Figure Description
[0031] Figure 1 The diagrams show the principles of four existing detection methods, where diagram a is the principle of axial displacement detection, diagram b is the principle of radial displacement detection, diagram c is the principle of rotational speed measurement detection, and diagram d is the principle of angular position detection.
[0032] Figure 2 This is a schematic diagram of the end point indicator mechanism described in this invention;
[0033] Figure 3 This is a schematic diagram of the auxiliary connection device described in this invention;
[0034] Figure 4 This is a front view of the auxiliary connection device described in this invention;
[0035] Figure 5 for Figure 4 A cross-sectional view along the AA direction;
[0036] Figure 6 This is a schematic diagram of the auxiliary connection device of the present invention in the connection state;
[0037] Figure 7 This is a schematic diagram of the auxiliary connection device of the present invention in the disconnected state;
[0038] Figure 8 This is a structural diagram of the rotating shaft, its magnetic target, return rod, return spring, and toggle block in the auxiliary connection device of the present invention.
[0039] Figure 9 for Figure 8 The left view;
[0040] The figure shows: 1-end cap, 2-magnetic target, 21-mounting cylinder, 22-irregular block, 221-sensing end face, 3-proximity signal, 4-return rod, 5-return spring, 6-rotating shaft, 7-toggle block, 8-fixed screw assembly, 9-mounting bracket, 10-ear plate, 11-actuating cylinder, 12-piston rod. Detailed Implementation
[0041] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely 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.
[0042] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.
[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1
[0044] like Figure 2-9 As shown, this embodiment provides a method for detecting the state of an actuator cylinder using a non-circular magnetic target and a proximity signal, including the following steps:
[0045] S1. Determine the detection method: The angle position detection method is adopted, that is, by rotating the magnetic target 2 in the forward or reverse direction, the magnetic target 2 is brought closer to or away from the proximity signal 3, so that the proximity signal 3 is turned on or off.
[0046] S2. Determination of the connection and disconnection gaps: When the gap between the magnetic target 2 and the proximity signal 3 is less than or equal to 0.5 mm, the proximity signal 3 is connected; when the gap between the magnetic target 2 and the proximity signal 3 is greater than 4 mm, the proximity signal is disconnected.
[0047] S3. Install the endpoint switch indicator mechanism: The endpoint switch indicator mechanism includes an actuator 11 and an auxiliary switching device. The auxiliary switching device includes an end cover 1, a proximity signal 3, a rotating shaft 6, a magnetic target 2, a return lever 4, a return spring 5, and a toggle block 7.
[0048] The piston rod 12 of the actuator 11 extends or retracts from the head end of the actuator 11. It is a commonly used drive mechanism in aircraft, used for the retraction and extension of landing gear and aircraft doors.
[0049] The head end of the end cap 1 is detachably connected to the tail end of the actuator cylinder 11 by means of a threaded connection, and the tail end of the end cap 1 is installed in the aircraft body.
[0050] The proximity signal 3 is detachably connected to a pre-set mounting bracket 9 on the outer wall of the end cover 1 via a threaded connection. The mounting bracket 9 is fixed to the outer wall of the end cover 1 and has a threaded hole thereon. The proximity signal 3 is fitted into the threaded hole and threadedly connected to it, which facilitates the adjustment of the distance between the proximity signal 3 and the magnetic target 2 during installation and testing. Moreover, the sensing end of the proximity signal 3 faces the tail end of the end cover 1, corresponding to the position of the magnetic target 2.
[0051] The rotating shaft 6 is installed inside the end cover 1 in a radial direction, and both ends of the rotating shaft 6 extend out of the end cover 1.
[0052] The magnetic target 2 is fixedly installed on one end of the rotating shaft 6 and corresponds to the sensing end of the proximity signal 3. The magnetic target 2 can move closer to or further away from the sensing end of the proximity signal 3 as the rotating shaft 6 rotates. The magnetic target 2 has an irregular shape and is composed of a mounting cylinder 21 and an irregular block 22. The mounting cylinder 21 is sleeved on the rotating shaft 6 and fixed to the rotating shaft 6 by a fixing screw assembly 8. The fixing screw assembly 8 includes a bolt and a nut. The bolt shank penetrates the rotating shaft 6 from one side of the mounting cylinder 21 and then exits from the other side of the mounting cylinder 21 and is threaded onto the nut. Tightening the nut will secure the mounting cylinder 21 to the rotating shaft 6.
[0053] The irregularly shaped block 22 is integrally fixed to the outer wall of the mounting cylinder 21 and located between the mounting cylinder 21 and the detection end face of the proximity signal. The irregularly shaped block rotates forward, so that the rotation angle when the proximity signal is on is approximately 30°; the irregularly shaped block rotates in the reverse direction, so that the rotation angle when the proximity signal is off is approximately 30°. While ensuring the on / off gap, the smaller rotation detection angle saves space. Figure 6 ,7 as well as Figure 9 As shown, the irregular block 22 has a structure similar to a triangular plate with a broken corner. One end of the broken corner is fixed integrally with the mounting cylinder 21. It has five faces, namely the front face, the rear face, the upper face, the lower face, and the sensing face. The upper face, the lower face, and the sensing face 221 surround the front face and the rear face. The upper face is an inclined surface that is connected to the upper side of the mounting cylinder 21 and inclined towards the mounting cylinder 21. The lower face is an inclined surface that is connected to the lower side of the mounting cylinder 21 and faces away from the sensing end of the proximity signal 3. The sensing face 221 is located between the upper face and the lower face and faces the sensing end of the proximity signal 3. The sensing face 221 can move closer to or away from the sensing end of the proximity signal 3 under the action of the magnetic target 2, so that the proximity signal 3 is turned on or off.
[0054] like Figure 7 As shown, initially (i.e., when the proximity signal 3 is off), the upper surface of the irregularly shaped block 22 and its sensing end surface 221 both face the sensing end surface of the proximity signal 3. The closest part of the irregularly shaped block 22 to the sensing end of the proximity signal 3 is the intersection of the upper surface of the irregularly shaped block 22 and its sensing end surface 211, and the distance from this intersection to the sensing end of the proximity signal 3 is greater than 4mm. When the irregularly shaped block 22 rotates forward (counterclockwise) 30° to approach the proximity signal 3, causing the proximity signal 3 to be turned on (the irregularly shaped block 22 rotates forward to its final position), the irregularly shaped block... The surface of block 22 closest to proximity signal 3 is the sensing end surface 221. At this point, the distance between the sensing end surface 221 and proximity signal 3 is less than or equal to 0.5mm, and the sensing end surface 221 is parallel to the sensing end of proximity signal 3. The sensing area between the sensing end surface 221 and proximity signal 3 is maximized. Simultaneously, the sensing end surface 221 is directly opposite the sensing end of proximity signal 3, and the area of the sensing end surface 221 is greater than or equal to the area of the sensing end of proximity signal 3. With this configuration, it is less likely that the proximity signal 3 will not activate after the target position is reached. When the irregular block 22 moves from... Figure 6 As shown, rotate 30° in the opposite direction from the activation position to move away from the proximity signal 3 until you reach the desired position. Figure 7 The disconnection position shown ensures that when the proximity signal 3 is disconnected (the irregular block 22 rotates in the reverse direction to its final position), the distance between the part of the irregular block 22 closest to the proximity signal 3 (i.e., the intersection of the upper end face and the sensing end face 221) and the proximity signal 3 is greater than 4mm. This configuration allows for accurate control of the critical points at which the magnetic target 2 begins to connect and disconnect.
[0055] One end of the return lever 4 is fixed to one end of the rotating shaft 6 via a spline.
[0056] One end of the return spring 5 is connected to the outer wall of the end cover 1, and the other end is connected to the other end of the return pull rod 4, which is used to pull the magnetic target 2 and the toggle block 7 to reset.
[0057] The lever 7 is fixed to the rotating shaft 6 by a spline and located inside the end cover 1. The lever 7 corresponds to the tail end of the piston rod 12 of the actuator cylinder 11.
[0058] S4. Installation and Position Adjustment of Magnetic Target 2:
[0059] During the installation of the magnetic target 2, the clearance of the actuator cylinder should be eliminated under working pressure before the installation and position adjustment (tuning) of the magnetic target 2 are carried out, so that the connection gap is within the detection sensitivity range of the proximity signal device. It is necessary to ensure that when the piston rod 12 is in the locked state at the upper end under 6.5MPa pressure, the connection gap (i.e., the connection distance) is 0.3-0.6mm; when the piston rod is in the locked state at the upper end without pressure, the connection gap (i.e., the connection distance) is less than 1.6mm, and the disconnection gap (i.e., the disconnection distance) is greater than 4mm. The disconnection distance refers to the minimum distance between the magnetic target 2 and the detection end face of the proximity signal device 3 after the piston rod 12 is extended. In order to ensure the disconnection distance, it is permissible to file the magnetic target 2. After filing, the surface treatment should be carried out according to the drawing requirements.
[0060] S5. Arrival Status Detection:
[0061] When the piston rod 12 inside the actuator cylinder 11 retracts, the tail end of the piston rod 12 moves linearly and strikes the lever 7. The lever 7 rotates around the rotating shaft 6, which in turn rotates the magnetic target 2. When the magnetic target 2 rotates into the detection sensitivity range of the proximity signal 3, that is, when the gap between the magnetic target 2 and the proximity signal 3 is less than or equal to 0.5mm, the proximity signal 3 is activated. At the same time, the return rod 4 pulls the return spring 5 to extend, and the return spring 5 stretches and stores energy. At this time, the sensing end face 221 and the proximity signal 3 are parallel to each other and the sensing area is at its maximum.
[0062] When the piston rod 12 inside the actuator cylinder 11 extends, the tail end of the piston rod 12 moves linearly away from the dial block 7. The return spring 5 contracts and resets, pulling the return lever 4 to reset and causing the rotating shaft 6 to rotate in the opposite direction. The rotation of the rotating shaft 6 causes the dial block 7 and the magnetic target 2 to rotate in the opposite direction and reset. When the magnetic target 2 rotates to outside the detection sensitivity range of the proximity signal 3, that is, when the gap between the magnetic target 2 and the proximity signal 3 is greater than 4mm, the proximity signal 3 is disconnected. Example 2
[0063] To facilitate adjustment of the axial installation position of the end-point switch mechanism, this embodiment is configured as follows based on Embodiment 1:
[0064] A lug plate 10 is installed at the tail end of the end cover 1. The lug plate 10 is sleeved on a pre-set shaft inside the aircraft body and can move back and forth along the shaft. Locking nuts threaded onto the shaft are provided on both sides of the lug plate 10. After adjusting the axial installation position of the end switch, tighten the nuts at both ends of the lug plate 10 on both sides of the lug plate 10.
[0065] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.
[0066] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0067] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.
Claims
1. A method for detecting the state of an actuator cylinder using a non-circular magnetic target and a proximity signal, characterized in that: Includes the following steps: S1. Determine the detection method: Use the angle position detection method, that is, rotate the magnetic target in the forward or reverse direction to make the magnetic target move closer to or away from the proximity signal, so that the proximity signal is turned on or off. S2. Determination of the connection and disconnection gaps: When the gap between the magnetic target and the proximity signal is less than or equal to 0.5 mm, the proximity signal is connected; when the gap between the magnetic target and the proximity signal is greater than 4 mm, the proximity signal is disconnected. S3. Install the endpoint switch indicator mechanism: The endpoint switch indicator mechanism includes an actuator, an end cover, a proximity signal, a rotating shaft, a magnetic target, a return lever, a return spring, and a lever; the end cover is detachably connected to the tail end of the actuator, and when the piston rod inside the actuator retracts to the position, the tail end of the piston rod can extend into the end cover; the proximity signal is detachably connected to the side of the end cover; the rotating shaft is rotatably installed inside the end cover along the diameter direction of the end cover, and both ends of the rotating shaft extend out of the end cover; The magnetic target is composed of a mounting cylinder and a shaped block, forming an irregular structure and fixed to one end of a rotating shaft. The mounting cylinder is sleeved outside the rotating shaft and located on the side of the detection end face of the proximity signal. The shaped block is fixed on the outer wall of the mounting cylinder and located between the mounting cylinder and the detection end face of the proximity signal. The side of the shaped block facing the detection end face of the proximity signal has a sensing end face. The sensing end face can move closer to or away from the detection end face of the proximity signal under the action of the magnetic target, thus turning the proximity signal on or off. When the proximity signal is on, the sensing end face is parallel to the detection end face of the proximity signal, and the sensing area between the sensing end face and the proximity signal is at its maximum. The return lever is fixed to the other end of the rotating shaft; the two ends of the return spring are fixed to the return lever and the end cover respectively; the lever is set inside the end cover and fixed in the middle of the rotating shaft, directly opposite the end of the piston rod. S4. Installation and Position Adjustment of Magnetic Target: During the installation of the magnetic target, the movement gap of the actuator cylinder is eliminated under working pressure before the installation of the magnetic target is carried out, so that the connection gap is close to the detection sensitivity range of the signal device. S5. Position Detection: When the piston rod inside the actuator retracts, the tail end of the piston rod moves linearly to strike the lever. The lever rotates around the shaft, which in turn rotates the magnetic target. When the magnetic target rotates into the proximity signal's detection sensitivity range, the proximity signal is activated. When the piston rod inside the actuator extends, the tail end of the piston rod moves linearly away from the lever. The return spring resets and drives the shaft to rotate in the opposite direction. The shaft rotation then drives the lever and the magnetic target to rotate in the opposite direction and reset. When the magnetic target rotates outside the proximity signal's detection sensitivity range, the proximity signal is deactivated.
2. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 1, characterized in that... When the rotating shaft drives the magnetic target close to the detection end face of the proximity signal, the return rod pulls the return spring to extend, and the return spring stretches and stores energy.
3. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 2, characterized in that... When the irregularly shaped block approaches the proximity signal and activates the proximity signal, the surface of the irregularly shaped block closest to the proximity signal is the sensing end surface. At this time, the distance between the sensing end surface and the proximity signal is less than or equal to 0.5mm. When the irregularly shaped block moves away from the proximity signal and deactivates the proximity signal, the distance between the surface of the irregularly shaped block closest to the proximity signal and the proximity signal is greater than 4mm.
4. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 3, characterized in that... When the sensing end face is parallel to the detection end face of the proximity signal, the sensing end face is directly opposite the detection end face of the proximity signal, and the area of the sensing end face is greater than or equal to the area of the detection end face of the proximity signal.
5. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 1, characterized in that... The mounting sleeve is mounted on the rotating shaft and fixed to the rotating shaft by a fixing screw assembly. The fixing screw assembly includes a bolt and a nut. The bolt shank passes through the rotating shaft from one side of the mounting sleeve and then passes out from the other side of the mounting sleeve. The nut is then threaded onto the bolt and tightened to fix the mounting sleeve to the rotating shaft.
6. The method for detecting the state of an actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 1, characterized in that... The irregularly shaped block rotates in the forward direction so that the rotation angle when the proximity signal is turned on is 15-45°; the irregularly shaped block rotates in the reverse direction so that the rotation angle when the proximity signal is turned off is 15-45°.
7. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 1, characterized in that... The proximity signal is connected to the outer wall of the end cap by a threaded connection.
8. The method for detecting the state of the actuator cylinder using a non-circular magnetic target and a proximity signal as described in claim 1, characterized in that... A lug is installed at the tail end of the end cover. The lug is fitted onto a pre-set shaft inside the aircraft body and can move back and forth along the shaft. Locking nuts threaded onto the shaft are provided on both sides of the lug.