A lifting actuator connecting device with unloading and trigger stop functions

Abstract

The present application belongs to the field of unmanned aerial vehicle, and particularly relates to a lifting actuator connecting device with unloading and triggering stop functions. The lifting actuator connecting device comprises a lifting actuator (1) and a pull rod mechanism (5), and through the cooperation of mechanical structure unloading and travel switch triggering, the automatic unloading and precise stop of the lifting actuator (1) under specific working conditions are realized.

Description

Technical Field

[0001] This invention belongs to the field of unmanned aerial vehicles (UAVs), and specifically relates to a lifting actuator connection device with unloading and trigger stop functions. Background Technology

[0002] Typically, large unmanned cargo aircraft use an active-drive door opening mechanism. According to research, the core logic of conventional door opening methods relies on the power source carried by the drone itself, such as motors, hydraulic pumps, and pneumatic devices, to drive the door lock mechanism to complete the unlocking action through power transmission, and further control the cabin door to open.

[0003] The existing door opening method requires the lifting actuator to continuously output power to drive the door during the opening phase. Once the door reaches the open position and is held, most of the force is concentrated on the lifting actuator, which is in a "force-suspended" state. At this time, the weight of the door and the friction of the mechanism are concentrated on the lead screw or transmission components of the lifting actuator, and it is prone to vibration during cargo loading and unloading. Therefore, it is very easy to cause overload damage to the lifting actuator, which not only increases the equipment maintenance cost, but also makes it impossible to repair the door state through the power system later. Summary of the Invention

[0004] Purpose of the invention: A lifting actuator connection device with unloading and trigger stop functions is provided. Through the coordinated design of mechanical structure unloading and limit switch triggering, the actuator can be automatically unloaded and precisely stopped under specific working conditions.

[0005] Technical solution: A lifting actuator connection device with unloading and trigger stop functions includes a lifting actuator 1 and a lever mechanism 5. Through the coordination of mechanical unloading and limit switch triggering, the lifting actuator 1 can automatically unload and precisely stop under specific working conditions.

[0006] Furthermore, it includes: a lifting actuator 1, a joint support 2, a limit switch 3, a joint bearing 4, and a tie rod mechanism 5. The output end of the lifting actuator 1 is connected to the hatch support, and the fixed end is connected to the joint support 2 through the spherical bearing 4. The joint support 2 is fixed on the fuselage beam 6. The movable end of the lever mechanism 5 is connected to the hatch support; the fixed end of the lever mechanism 5 is connected to the fuselage. Limit switch 3 is mounted on joint support 2, and the target of limit switch 3 is integrated on joint bearing 4.

[0007] Furthermore, the lifting actuator 1 is located on the front side of the hatch, and the lever mechanism 5 is installed on the rear side of the hatch.

[0008] Furthermore, the lifting actuator 1 is located in the middle section of the hatch, and the lever mechanism 5 is installed on the front and rear sides of the hatch.

[0009] Furthermore, the trigger stroke of limit switch 3 is 4-6mm.

[0010] Furthermore, the spherical bearing 4 is a self-lubricating radial spherical bearing.

[0011] Furthermore, the inner ring of the spherical bearing 4 is interference-fitted with the lifting actuator 1.

[0012] Furthermore, when the hatch is lowered to the position supported by the lever mechanism 5, the mechanical unloading lifting actuator 1 is activated.

[0013] Furthermore, when the hatch is lowered to the point where it is supported by the lever mechanism 5, the lifting actuator 1 continues to operate. Under the reaction force, the outer shell of the lifting actuator 1 drives the spherical bearing 4 to slide upward relative to the spherical support 2, thereby achieving mechanical unloading. At this time, the weight of the hatch is borne by the lever mechanism 5. When the bearing moves to the preset unloading position, the target integrated on the spherical bearing 4 contacts the limit switch 3 and sends a trigger signal. The control system immediately stops the actuator operation. At this time, the door load is completely borne by the lever mechanism 5. The spherical bearing 4 is used to bear the axial load during operation and adapt to the swing of the actuator during operation.

[0014] Beneficial effects: Through an innovative mechanical unloading mechanism, after the tailgate is supported by the lever mechanism, the actuator transitions from a high-load "force-suspended" state to a fully unloaded state. The actuator no longer needs to bear the load for extended periods, significantly reducing wear on key transmission components and extending their service life. The actuator and body are connected using spherical bearings, ensuring high load-bearing capacity while allowing the actuator to swing at a certain angle during operation, ensuring the system's stability and adaptability under complex working conditions. By using custom-shaped spherical bearings, the bearing outer ring and limit switch target are integrated, improving the limit switch triggering accuracy. The radial spherical bearing design is derived from mature engineering practice, demonstrating high feasibility and reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the initial installation of the lifting actuator targeted by the present invention, showing its connection relationship with the machine body.

[0017] Figure 2This invention relates to the lifting actuator and its connecting rod mechanism.

[0018] Figure 3 This is a schematic diagram of the working process of the unloading lifting actuator system of the present invention, which intuitively illustrates the linkage principle between mechanical unloading and limit switch triggering.

[0019] Among them, the lifting actuator 1, joint support 2, limit switch 3, joint bearing 4, tie rod mechanism 5, body crossbeam 6, tailgate 7, and lead screw 8. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] This application relates to an actuation system for driving the tail hatch of a large unmanned cargo aircraft, specifically a lifting actuator connection device with unloading and trigger stop functions.

[0027] The present invention provides a lifting actuator connection device with unloading and trigger stop functions. Through the coordination of mechanical structure unloading and limit switch triggering, the lifting actuator 1 can achieve automatic unloading and precise stopping under specific working conditions.

[0028] like Figure 1-3 A lifting actuator connection device with unloading and trigger stop functions includes: a lifting actuator 1, a joint support 2, a limit switch 3, a joint bearing 4, and a pull rod mechanism 5. The output end of the lifting actuator 1 is connected to the door support, and the fixed end is connected to the joint support 2 via the joint bearing 4. The joint support 2 is fixed to the fuselage crossbeam 6. The inner ring of the joint bearing 4 is interference-fitted with the lifting actuator. When the tail door 7 is lowered to be supported by the onboard ramp tail door pull rod mechanism, the lifting actuator continues to operate. The joint bearing 4 is used to bear the axial load during operation and to accommodate the swing of the actuator during operation.

[0029] The movable end of the lever mechanism 5 is connected to the hatch support; the fixed end of the lever mechanism 5 is connected to the fuselage; the limit switch 3 is installed on the joint support 2, and the target of the limit switch 3 is integrated on the joint bearing 4. The limit switch can receive the signal that the lifting actuator has reached the designated position and send the signal to the control unit to complete the execution or judgment of the command, thus affecting the execution of the actuator.

[0030] In one possible embodiment, the lifting actuator 1 is located on the front side of the hatch, and the lever mechanism 5 is installed on the rear side of the hatch.

[0031] In one possible embodiment, the lifting actuator 1 is located in the middle of the hatch, and the lever mechanism 5 is installed on the front and rear sides of the hatch.

[0032] In one possible embodiment, the trigger stroke of limit switch 3 is 4-6 mm.

[0033] In one possible embodiment, the spherical bearing 4 is a self-lubricating radial spherical bearing.

[0034] In one possible embodiment, the inner ring of the spherical bearing 4 is interference-fitted with the lifting actuator 1.

[0035] The lever mechanism includes a telescopic connecting rod and a buffer hinge. When the hatch is lowered to be supported by the ramp tail door lever mechanism, the lever mechanism gradually takes over the hatch load through the buffer hinge, and the housing of the lifting actuator and the spherical bearing slide relative to each other.

[0036] The buffer hinge of the lever mechanism has an embedded spring assembly to compensate for the impact load during the movement of the hatch.

[0037] Working principle: The lifting actuator includes a motor, braking device, torque limiter, reduction gear, nut housing, lead screw, pin, rod end bearing, and hatch support. The output end of the lifting actuator 1 is connected to the hatch support, and the fixed end is connected to the joint support 2 via a spherical bearing 4. The joint support 2 is fixed to the fuselage crossbeam 6. The core feature is the use of the spherical bearing 4 to assemble the lifting actuator 1 and the joint support 2 together. The inner ring of the bearing is interference-fitted with the actuator. When the lifting actuator drives the tail door 7 to be lowered to the position supported by the onboard ramp tail door pull rod mechanism 5, the lifting actuator 1 continues to operate. At this time, the position of the lead screw 8 remains unchanged. Under the reaction force, the housing of the lifting actuator 1 drives the spherical bearing 4 to slide upwards along the Z-axis relative to the joint support 2, achieving mechanical unloading. At this time, the weight of the hatch is borne by the pull rod mechanism 5. The spherical bearing 4 integrates a target, and a limit switch 3 is provided at a corresponding position on the joint support 2. When the bearing moves to the preset unloading position with a Z-axis displacement of 4-6mm, the target integrated on the outer ring of the spherical plain bearing 4 contacts the limit switch 3 and sends a trigger signal. The control system immediately cuts off the power to the lifting actuator motor, stopping its operation. At this point, the actuator achieves complete mechanical unloading. The door load is now entirely borne by the lever mechanism 5. The spherical plain bearing 4 is used to withstand axial loads during operation and to accommodate the actuator's oscillation during operation.

[0038] like Figure 3 As shown, in a preferred embodiment of the invention, the lifting actuator is connected to the joint support via a spherical bearing. When the actuator lowers the tailgate 7 to the position supported by the on-machine pull rod mechanism, the actuator motor continues to operate. At this time, the position of the lead screw 8 remains unchanged. Under the reaction force, the actuator housing drives the spherical bearing to slide upward relative to the joint support along the Z-axis. When the sliding distance reaches a preset 5mm (this distance can be finely adjusted according to the limit switch parameters within the range of 4-6mm), the target integrated in the outer ring of the bearing contacts the limit switch, and the limit switch immediately generates a positioning signal. This signal is transmitted to the control system, which immediately cuts off the power to the actuator motor, stopping its operation. Thus, the actuator achieves complete mechanical unloading.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lifting actuator connection device with unloading and trigger stop functions, characterized in that, include: The lifting actuator and lever mechanism, through the coordination of mechanical unloading and limit switch triggering, enable the lifting actuator to automatically unload and precisely stop under specific working conditions.

2. The lifting actuator connecting device according to claim 1, characterized in that, Specifically, it includes a lifting actuator, a joint support, a limit switch, a joint bearing, and a tie rod mechanism. The output end of the lifting actuator is connected to the hatch support, and the fixed end is connected to the joint support through a spherical bearing. The joint support is fixed on the fuselage crossbeam. The movable end of the lever mechanism is connected to the hatch support. The fixed end of the lever mechanism is connected to the fuselage. The limit switch is installed on the joint support, and the target of the limit switch is integrated on the spherical bearing.

3. The lifting actuator connecting device according to claim 1, characterized in that, The lifting actuator is located on the front side of the hatch, and the lever mechanism is installed on the rear side of the hatch.

4. The lifting actuator connecting device according to claim 1, characterized in that, The lifting actuator is located in the middle of the hatch, and the lever mechanism is installed on the front and rear sides of the hatch.

5. The lifting actuator connecting device according to claim 1, characterized in that, The trigger stroke of the limit switch is 4-6mm.

6. The lifting actuator connecting device according to claim 1, characterized in that, The spherical plain bearing is a self-lubricating radial spherical plain bearing.

7. The lifting actuator connecting device according to claim 1, characterized in that, The inner ring of the spherical bearing is interference-fitted with the lifting actuator.

8. The lifting actuator connecting device according to claim 1, characterized in that, When the hatch is lowered to the position supported by the lever mechanism, the mechanical unloading lifting actuator is activated.

9. The lifting actuator connecting device according to claim 2, characterized in that, When the hatch is lowered to the point where it is supported by the lever mechanism, the lifting actuator continues to operate. Under the reaction force, the outer shell of the lifting actuator drives the spherical bearing to slide upward relative to the spherical support, thereby achieving mechanical unloading. At this time, the weight of the hatch is borne by the lever mechanism. When the bearing moves to the preset unloading position, the target integrated on the spherical bearing contacts the limit switch and sends a trigger signal. The control system immediately stops the actuator. At this time, the door load is completely borne by the lever mechanism. The spherical bearing is used to bear the axial load during operation and to adapt to the swing of the actuator during operation.

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