Electric cylinder emergency passive unloading structure and control method thereof
By introducing an electromagnetic clutch into the electric cylinder, the power control between the reducer and the mechanical transmission structure is achieved, and the problem of long unloading time of the electric cylinder during emergency passive unloading is solved, and the effect of rapid unloading and improved test safety is achieved.
Patent Information
- Application Number
- CN202510237013.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-01
- Publication Date
- 2025-04-15
AI Technical Summary
In the static/fatigue strength test of aircraft structure, when existing electric cylinders are passively unloaded in emergency, it is difficult for the push rod and its ball screw to quickly return to their initial position, resulting in a long unloading time and affecting the safety of the test.
An emergency passive unloading structure of electric cylinder is designed, and a electromagnetic clutch is provided between the reducer and the mechanical transmission structure, and the engagement and separation are controlled by power, so as to achieve rapid unloading.
Through engagement and separation of the electromagnetic clutch, the resistance that the push rod and ball screw needs to overcome is reduced, allowing it to quickly return to its initial position, shortening the unloading time, and improving the safety and efficiency of the test.
Smart Images
Figure CN119825845A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of electric cylinder design, and specifically relates to an electric cylinder emergency passive unloading structure and a control method thereof. Background Art
[0002] Aircraft structure static / fatigue strength tests are mostly loaded with electric cylinders, which usually include a servo motor, a reducer, a mechanical transmission structure and a cylinder body. The servo motor is connected to the reducer, and the reducer is connected to the ball screw set in the cylinder body through the mechanical transmission structure. The mechanical transmission structure includes structures such as synchronous belts and synchronous wheels. The servo motor drives the reducer to rotate, and the ball screw is driven to rotate through the mechanical transmission structure, converting the rotational motion into the linear motion of the push rod set in the cylinder body, so that the push rod is extended or retracted.
[0003] During the test loading, the servo motor provides power, which allows components such as the ball screw to easily overcome frictional resistance, and the push rod can achieve efficient loading of the aircraft structure. However, when emergency passive unloading is required, the servo motor is powered off, and the push rod moves in the direction of load reduction under the reaction force and returns to the zero-load position, that is, the initial position. During this process, the push rod and its ball screw need to overcome the large resistance of the servo motor and reducer power system, making it difficult to achieve rapid unloading. The unloading time is long, affecting the safety of the test.
[0004] This application is proposed in view of the above-mentioned technical defects. Summary of the invention
[0005] The purpose of the present application is to provide an electric cylinder emergency passive unloading structure and a control method thereof, so as to overcome or alleviate at least one aspect of the known technical defects.
[0006] The technical solution of this application is:
[0007] On the one hand, an electric cylinder emergency passive unloading structure is provided, including an electromagnetic clutch;
[0008] The electromagnetic clutch is set between the reducer of the electric cylinder and the mechanical transmission structure, and can be engaged and disengaged by electric control;
[0009] When the electromagnetic clutch is engaged, the reducer and the mechanical transmission structure are engaged. At this time, the servo motor of the electric cylinder can drive the reducer to rotate, and the ball screw of the electric cylinder is driven to rotate through the electromagnetic clutch and the mechanical transmission structure, so that the push rod of the electric cylinder is extended or retracted;
[0010] When the electromagnetic clutch is disengaged, the reducer and the mechanical transmission structure are separated. At this time, the servo motor of the electric cylinder can only drive the reducer to rotate, and can no longer drive the ball screw of the electric cylinder to rotate through the electromagnetic clutch and the mechanical transmission structure to extend or retract the push rod of the electric cylinder.
[0011] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, the engagement and disengagement of the electromagnetic clutch are controlled by 24V direct current.
[0012] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, the electromagnetic clutch is engaged when power is off and disengaged when power is on.
[0013] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, the electromagnetic clutch includes two half-clutches, wherein one half-clutch is connected to the output end of the reducer and can slide along the output end of the reducer, and the other half-clutch is connected to the input end of the mechanical transmission structure;
[0014] The electromagnetic clutch adopts a tooth-type structure, with teeth on the two half-clutches. When the power is off, the half-clutch connected to the output end of the reducer slides toward the other half-clutch, so that the teeth on the two half-clutches mesh together, and the electromagnetic clutch is engaged. When the power is on, the half-clutch connected to the output end of the reducer slides back to the other half-clutch, so that the teeth on the two half-clutches separate, and the electromagnetic clutch is disconnected.
[0015] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, the output end of the reducer and the half-clutch are connected by a guide flat key, and the input end of the mechanical transmission structure and the half-clutch are connected by a countersunk bolt.
[0016] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, a spring is connected to the half-clutch connected to the output end of the reducer and a coil is provided. When the power is off, the spring relies on its elastic force to push the half-clutch connected to the output end of the reducer to slide toward the other half-clutch, so that the teeth on the two half-clutches mesh together, so that the electromagnetic clutch is engaged. When the power is turned on, current flows into the coil, generating magnetic force, which adsorbs the half-clutch connected to the output end of the reducer to overcome the elastic force of the spring and slide back to the other half-clutch, so that the teeth on the two half-clutches separate and the electromagnetic clutch is disconnected.
[0017] According to at least one embodiment of the present application, in the above-mentioned electric cylinder emergency passive unloading structure, the electromagnetic clutch also includes a centering ring, which is connected to a half-clutch, and is centered and positioned with the half-clutch through a stopper, and a plurality of guide pins are arranged on the centering ring, and a plurality of guide holes are arranged on the other half-clutch, and when the electromagnetic clutch is engaged, each guide pin is inserted into each guide hole, and when the electromagnetic clutch is disengaged, each guide pin is removed from each guide hole.
[0018] On the other hand, a control method of an electric cylinder emergency passive unloading structure is provided, which is used to control the above-mentioned electric cylinder emergency passive unloading structure, comprising:
[0019] When loading the structure, the electromagnetic clutch is de-energized, so that the electromagnetic clutch is engaged;
[0020] When performing emergency passive unloading, power is supplied to the electromagnetic clutch to disconnect it.
[0021] This application has at least the following beneficial technical effects:
[0022] An electric cylinder emergency passive unloading structure is provided. The design uses electricity to control the engagement and disengagement of the electromagnetic clutch, so that the electric cylinder can be switched between loading and emergency passive unloading. The structure has a high response speed, can ensure a rapid response to the test control, and improve the efficiency and safety of the test. When performing emergency passive unloading, the electromagnetic clutch can be set to separate. Since the reducer is separated from the mechanical transmission structure, the movement of the push rod and its ball screw no longer needs to overcome the large resistance of the servo motor and the reducer power system. The push rod only needs to overcome a small friction resistance to quickly return to the initial position, which can achieve rapid unloading and a short unloading time. It is used in static / fatigue strength tests of aircraft structures and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a schematic diagram of an emergency passive unloading structure of an electric cylinder provided in an embodiment of the present application;
[0024] Figure 2 is a schematic diagram of an electromagnetic clutch provided in an embodiment of the present application;
[0025] in:
[0026] 1-Electromagnetic clutch; 2-Electric cylinder;
[0027] 11-half clutch; 12-centering ring; 13-guide nail;
[0028] 21-reducer; 22-mechanical transmission structure; 23-servo motor; 24-ball screw; 25-push rod.
[0029] In order to better illustrate the present embodiment, some contents of the drawings may be omitted, enlarged or reduced, which is only used for illustrative purposes and should not be construed as limiting the present application. DETAILED DESCRIPTION
[0030] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that for the sake of ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.
[0031] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the common meanings understood by those skilled in the art in the field to which this application belongs. The term "include" used in the description of this application means that the concepts appearing before the term include the concepts listed after the term and their equivalents, without excluding other related concepts.
[0032] In addition, the words indicating orientation used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the object being described changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and other similar words used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.
[0033] An electric cylinder emergency passive unloading structure, such as Figure 1 As shown, it includes an electromagnetic clutch 1.
[0034] The electromagnetic clutch 1 is provided between the speed reducer 21 of the electric cylinder 2 and the mechanical transmission structure 22, and can be engaged and disengaged by electric control.
[0035] When the electromagnetic clutch 1 is engaged, the reducer 21 is engaged with the mechanical transmission structure 22. At this time, the servo motor 23 of the electric cylinder 2 can drive the reducer 21 to rotate, and the ball screw 24 of the electric cylinder 2 is driven to rotate through the electromagnetic clutch 1 and the mechanical transmission structure 22, so that the push rod 25 of the electric cylinder 2 is extended or retracted.
[0036] When the structure is loaded, the electromagnetic clutch 1 may be arranged to engage.
[0037] When the electromagnetic clutch 1 is disengaged, the reducer 21 and the mechanical transmission structure 22 are separated. At this time, the servo motor 23 of the electric cylinder 2 can only drive the reducer 21 to rotate, and can no longer drive the ball screw 24 of the electric cylinder 2 to rotate through the electromagnetic clutch 1 and the mechanical transmission structure 22, so as to extend or retract the push rod 25 of the electric cylinder 2.
[0038] During emergency passive unloading, the electromagnetic clutch 1 can be set to be separated. Since the reducer 21 is separated from the mechanical transmission structure 22, the movement of the push rod 25 and its ball screw 24 no longer needs to overcome the large resistance of the servo motor 23 and the reducer 22 power system. The push rod 25 only needs to overcome a very small friction resistance to quickly return to the initial position, which can achieve rapid unloading with a short unloading time. It is used in aircraft structure static / fatigue strength tests and has high safety.
[0039] In the electric cylinder emergency passive unloading structure disclosed in the above embodiment, the design uses electricity to control the engagement and disengagement of the electromagnetic clutch 1, so that the electric cylinder 2 can switch between loading and emergency passive unloading. It has a high response speed, can ensure a rapid response to the test control, and improve the efficiency and safety of the test.
[0040] The engagement and disengagement of the electromagnetic clutch 1 can be designed to be controlled by 24V DC, and the electromagnetic clutch 1 is designed to engage when the power is off and disengage when the power is on, which can reduce unnecessary failures caused by long-term heating of the electromagnetic clutch 1. In addition, this design makes the electromagnetic clutch 1 in a normally closed state. Even if an abnormality occurs in the power supply system, the engagement between the reducer 21 and the mechanical transmission structure 22 can be guaranteed, the test loading can be guaranteed, and the position of the servo motor 23 can be guaranteed to correspond to the mechanical position of the push rod 25 in real time, which is convenient for accurately obtaining the absolute position of the load end of the electric cylinder and the deformation of the test piece.
[0041] The electromagnetic clutch 1 includes two half clutches 11, wherein one half clutch 11 is connected to the output end of the reducer 21, specifically by a guide flat key, and can slide along the output end of the reducer 21, and the other half clutch 11 is connected to the input end of the mechanical transmission structure 22, specifically by a countersunk bolt, such as Figure 2 shown.
[0042] The electromagnetic clutch 1 adopts a tooth-type structure, and the two half-clutches 11 are provided with teeth. When the power is off, the half-clutch 11 connected to the output end of the reducer 21 slides toward the other half-clutch 11, so that the teeth on the two half-clutches 11 are meshed together, so that the electromagnetic clutch 1 is engaged, and the torque is transmitted by using the mutually meshing teeth. Compared with the friction type, it can transmit a larger torque and has a higher torque transmission efficiency. When the power is on, the half-clutch 11 connected to the output end of the reducer 21 slides away from the other half-clutch 11, so that the teeth on the two half-clutches 11 are separated, and the electromagnetic clutch 1 is disconnected.
[0043] Specifically, a spring and a coil can be designed to be connected to the half-clutch 11 connected to the output end of the reducer 21. When the power is off, the spring relies on its elastic force to push the half-clutch 11 connected to the output end of the reducer 21 to slide toward the other half-clutch 11, so that the teeth on the two half-clutches 11 are meshed together, so that the electromagnetic clutch 1 is engaged. When the power is turned on, current is passed through the coil to generate magnetic force, which adsorbs the half-clutch 11 connected to the output end of the reducer 21 to overcome the elastic force of the spring and slide back to the other half-clutch 11, so that the teeth on the two half-clutches 11 are separated, and the electromagnetic clutch 1 is disconnected.
[0044] The electromagnetic clutch 1 also includes a centering ring 12, which is connected to a half-clutch 11, and is centered and positioned with the half-clutch 11 through a stopper, and a plurality of guide pins 13 are arranged on the centering ring 12, and a plurality of guide holes are arranged on the other half-clutch 11. When the electromagnetic clutch 1 is engaged, each guide pin 13 is inserted into each guide hole, and when the electromagnetic clutch 1 is separated, each guide pin 13 is removed from each guide hole.
[0045] The electric cylinder emergency passive unloading structure disclosed in the above embodiment can be controlled by referring to the following method:
[0046] When loading the structure, the electromagnetic clutch 1 is powered off, so that the electromagnetic clutch 1 is engaged;
[0047] When performing emergency passive unloading, the electromagnetic clutch 1 is energized to disconnect the electromagnetic clutch 1.
[0048] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.
Claims
1. An emergency passive unloading structure of an electric cylinder, characterized in that: It comprises an electromagnetic clutch (1); The electromagnetic clutch (1) is arranged between the reducer (21) of the electric cylinder (2) and the mechanical transmission structure (22), and can be engaged and disengaged by electric control; When the electromagnetic clutch (1) is engaged, the reducer (21) and the mechanical transmission structure (22) are engaged. At this time, the servo motor (23) of the electric cylinder (2) can drive the reducer (21) to rotate, and the ball screw (24) of the electric cylinder (2) is driven to rotate through the electromagnetic clutch (1) and the mechanical transmission structure (22), so that the push rod (25) of the electric cylinder (2) is extended or retracted; When the electromagnetic clutch (1) is disengaged, the reducer (21) and the mechanical transmission structure (22) are separated. At this time, the servo motor (23) of the electric cylinder (2) can only drive the reducer (21) to rotate, and can no longer drive the ball screw (24) of the electric cylinder (2) to rotate through the electromagnetic clutch (1) and the mechanical transmission structure (22), so as to extend or retract the push rod (25) of the electric cylinder (2).
2. The electric cylinder emergency passive unloading structure according to claim 1 is characterized in that: The engagement and disengagement of the electromagnetic clutch (1) is controlled by 24V DC.
3. The electric cylinder emergency passive unloading structure according to claim 2 is characterized in that: The electromagnetic clutch (1) is engaged when power is off and disengaged when power is on.
4. The electric cylinder emergency passive unloading structure according to claim 3 is characterized in that: The electromagnetic clutch (1) comprises two half-clutches (11), wherein one half-clutch (11) is connected to the output end of the reducer (21) and can slide along the output end of the reducer (21), and the other half-clutch (11) is connected to the input end of the mechanical transmission structure (22); The electromagnetic clutch (1) adopts a tooth-embedded structure, and two half clutches (11) are provided with teeth. When the power is off, the half clutch (11) connected to the output end of the reducer (21) slides toward the other half clutch (11), so that the teeth on the two half clutches (11) are meshed together, so that the electromagnetic clutch (1) is engaged. When the power is on, the half clutch (11) connected to the output end of the reducer (21) slides away from the other half clutch (11), so that the teeth on the two half clutches (11) are separated, so that the electromagnetic clutch (1) is disconnected.
5. The electric cylinder emergency passive unloading structure according to claim 4 is characterized in that: The output end of the speed reducer (21) is connected to the half clutch (11) via a guide flat key, and the input end of the mechanical transmission structure (22) is connected to the half clutch (11) via a countersunk bolt.
6. The electric cylinder emergency passive unloading structure according to claim 5, characterized in that: A spring and a coil are connected to the half clutch (11) connected to the output end of the reducer (21). When the power is off, the spring pushes the half clutch (11) connected to the output end of the reducer (21) to slide toward the other half clutch (11) by its elastic force, so that the teeth on the two half clutches (11) are meshed together, so that the electromagnetic clutch (1) is engaged. When the power is on, current is passed through the coil to generate magnetic force, so that the half clutch (11) connected to the output end of the reducer (21) overcomes the elastic force of the spring and slides back to the other half clutch (11), so that the teeth on the two half clutches (11) are separated, so that the electromagnetic clutch (1) is disconnected.
7. The electric cylinder emergency passive unloading structure according to claim 6, characterized in that: The electromagnetic clutch (1) also includes a centering ring (12), which is connected to one half clutch (11) and is centered and positioned with the half clutch (11) through a stopper, and is provided with a plurality of guide pins (13). The other half clutch (11) is provided with a plurality of guide holes. When the electromagnetic clutch (1) is engaged, each guide pin (13) is inserted into each guide hole, and when the electromagnetic clutch (1) is separated, each guide pin (13) is removed from each guide hole.
8. A method for controlling an emergency passive unloading structure of an electric cylinder, for controlling the emergency passive unloading structure of the electric cylinder according to claim 7, characterized in that: include: When the structure is loaded, the electromagnetic clutch (1) is powered off, so that the electromagnetic clutch (1) is engaged; When performing emergency passive unloading, the electromagnetic clutch (1) is energized to disconnect the electromagnetic clutch (1).