Limiting mechanism of electric actuator and electric actuator

Abstract

The application discloses a limiting mechanism of an electric actuator and the electric actuator, which comprises a rotating disc and a switch unit, and the rotating disc touches the switch unit after rotating by a preset angle; the limiting mechanism comprises a lower clutch disc, an upper clutch disc, a mounting plate and a shell; the lower clutch disc is rotatably mounted on the mounting plate, the upper clutch disc is mounted on the upper end of the lower clutch disc, the shell is fixed on the mounting plate and encloses the mounting plate to form a mounting cavity, and at least part of the upper end of the lower clutch disc and the upper clutch disc is located in the mounting cavity of the shell; the upper clutch disc drives the rotating disc to rotate; and at least one set of clutch assemblies for separating or combining the lower clutch disc and the upper clutch disc is arranged between the lower clutch disc and the upper clutch disc. The problem that the rotating disc collides with the switch unit when the electric actuator is faulty and the rotating disc continuously rotates or the lower clutch disc is manually driven to rotate is solved. The lower clutch disc is separated from the upper clutch disc and the rotating disc through the clutch assemblies, the rotating disc is stopped from rotating, and the purpose of protecting the switch unit is finally achieved.

Description

Technical Field

[0001] This invention application relates to the field of electric actuators, specifically to a limiting mechanism for an electric actuator and an electric actuator. Background Technology

[0002] With the increasing adoption of automation in industrial production, manual operation is gradually being replaced by machinery or automated equipment. Among these, electric actuators are widely used in daily operations due to their high stability, and people are constantly enhancing their safety performance while using them. The main function of the output shaft limit device is to control the rotation angle of the actuator's output shaft, thereby controlling the opening and closing position of the driven valve.

[0003] The existing output shaft limiting device for electric actuators mainly consists of an output shaft, a rotary disk, an open-position micro switch, and a closed-position micro switch. A rotary disk is mounted on the upper part of the output shaft. Open-position and closed-position micro switches are respectively installed on the radial sides of the rotary disk. When the output shaft rotates in the valve-opening direction, the rotary disk rotates with the output shaft. When the contact pin on the rotary disk touches the open-position micro switch, the output shaft stops and is fully open. When the output shaft rotates in the valve-closing direction, the rotary disk rotates with the output shaft. When the contact pin touches the closed-position micro switch, the output shaft stops and is fully closed. This device is convenient to debug, highly efficient, and suitable for mass production.

[0004] Existing technology also provides an output shaft positioning device for an electric actuator, including an output shaft, a cam, an open-position micro switch, and a closed-position micro switch. The cam is mounted on the output shaft and can rotate together with it. An open-position micro switch and a closed-position micro switch are respectively mounted on both sides of the cam. When the output shaft rotates in the valve-opening direction, the cam touches the open-position micro switch, and the output shaft stops and is fully open. When the output shaft rotates in the valve-closing direction, the cam touches the closed-position micro switch, and the output shaft stops and is fully closed.

[0005] However, both of the above-mentioned existing electric actuators have obvious drawbacks:

[0006] (1) After the output shaft of the first type of electric actuator is in the open or closed position, if the electric actuator malfunctions or the output shaft is manually driven to rotate, the output shaft will continue to rotate in the original direction, and the micro switch may be damaged.

[0007] (2) The disadvantage of the latter type of existing electric actuator is that the cam is more troublesome to debug and has lower working efficiency.

[0008] Therefore, there is an urgent need for a simple and easy-to-adjust electric actuator limit device to prevent the output shaft from exceeding the limit protection position when the electric actuator malfunctions or is operated manually. Summary of the Invention

[0009] This invention application provides a limiting mechanism for an electric actuator and an electric actuator to solve the problems existing in the prior art.

[0010] To achieve the above objectives, the first aspect of this application provides a limiting mechanism for an electric actuator, including a rotating disk and a switching unit. The rotating disk touches the switching unit after rotating by a preset angle. The mechanism further includes: a lower clutch disk, an upper clutch disk, a mounting plate, and a housing. The lower clutch disk is rotatably mounted on the mounting plate, and the upper clutch disk is mounted on the upper end of the lower clutch disk. The housing is fixedly mounted on the mounting plate and forms a mounting cavity with the mounting plate. The upper end of the lower clutch disk and at least a portion of the upper clutch disk are located within the mounting cavity of the housing. The upper clutch disk drives the rotating disk to rotate. At least one set of clutch components for separating or engaging the lower and upper clutch disks is provided between them.

[0011] In the engaged state: the upper clutch disc is connected to the lower clutch disc as one unit through the clutch assembly, and the lower clutch disc and the upper clutch disc rotate together and drive the rotating disc to rotate;

[0012] In the disengaged state: the upper clutch disc separates from the lower clutch disc through the clutch assembly, the lower clutch disc rotates, and the upper clutch disc and the rotating disc stop rotating;

[0013] A positioning component is provided between the upper clutch disc and the inner wall of the housing, and the upper clutch disc makes frictional contact with the housing through the positioning component.

[0014] Furthermore, the clutch assembly includes an elastic element and an insert, the elastic element being located within the lower clutch disc, and the insert being disposed on the top of the elastic element; in the engaged state: the lower portions of the elastic element and the insert are located within the lower clutch disc, and the upper portion of the insert is located within the upper clutch disc;

[0015] In the disengaged state: the elastic element and the insert are completely located within the lower clutch disc.

[0016] Furthermore, the elastic element is a clutch spring, the insert is a clutch ball, the clutch spring is embedded in the lower clutch groove formed on the upper end face of the lower clutch disc, the clutch ball is placed on the top of the clutch spring, and the lower end face of the upper clutch disc is formed with an upper clutch groove for accommodating the clutch ball.

[0017] In the engaged state: some clutch balls are embedded in the upper clutch groove of the upper clutch disc, so that the upper clutch disc and the lower clutch disc are engaged as one unit;

[0018] In the disengaged state: the clutch balls disengage from the upper clutch groove in the upper clutch disc, the clutch balls come into contact with the lower end plane of the upper clutch disc, and the lower clutch disc separates from the upper clutch disc.

[0019] Furthermore, the upper clutch groove can be an arc-shaped structure, a conical structure, a long groove structure, or a through-hole structure.

[0020] Furthermore, the clutch assembly is either a ball screw or a ball plunger.

[0021] Furthermore, a portion of the positioning component is embedded in the upper clutch disc, and another portion of the positioning component is in contact with the housing. The positioning component includes a positioning spring and a positioning ball. The positioning spring is embedded in a positioning groove provided in the upper clutch disc, and a positioning ball is provided on the top of the positioning spring, with the positioning ball abutting against the inner wall of the housing.

[0022] Furthermore, the positioning component is an elastic O-ring, which is embedded in the upper end face of the upper clutch disc, or at the edge of the upper end face, or in an annular groove formed on the side.

[0023] Furthermore, the inner wall surface of the housing that abuts against the positioning component is a rough surface.

[0024] Furthermore, the upper clutch disc drives the rotating disc to rotate through at least one stage of transmission mechanism.

[0025] A second aspect of the present invention provides an electric actuator, including the limiting mechanism of the electric actuator provided above, wherein the lower clutch disc is connected to the output shaft of the electric actuator through at least one stage of transmission mechanism.

[0026] The advantages and positive effects of this invention are:

[0027] 1. The limiting mechanism of the electric actuator provided by this invention realizes two states of "disengagement" and "engagement" between the lower clutch plate and the upper clutch plate through a clutch assembly. In normal operation, the lower clutch plate drives the upper clutch plate and ultimately drives the rotating disk to rotate. When the actuator malfunctions and the rotating disk continues to rotate, or when the lower clutch plate is manually driven to rotate, the lower clutch plate separates from the upper clutch plate and the rotating disk, and the rotating disk stops rotating to prevent damage to the switching unit. This limiting mechanism ensures that the rotating disk stops rotating in the event of a malfunction, thereby protecting the switching unit from damage. Finally, the lower clutch plate and the rotating disk are reset by rotation of the lower clutch plate, effectively reducing maintenance costs and improving maintenance efficiency.

[0028] 2. The limiting mechanism of the electric actuator provided by the present invention has a clutch spring and a clutch ball in the clutch assembly. The axial displacement of the clutch ball realizes the two states of "disengagement" and "engagement" of the lower clutch disc and the upper clutch disc. The structure is simple, low in cost and easy to implement.

[0029] 3. The limiting mechanism of the electric actuator provided by this invention achieves the goal of keeping the upper clutch disc stationary after it separates from the lower clutch disc through a positioning component. The positioning component may include metal springs and balls, non-metallic elastic rubber rings, etc. The purpose is to increase the motion resistance between the upper clutch disc and the housing, thereby achieving the goal of quickly bringing the upper clutch disc to a stop after it disengages from the lower clutch disc.

[0030] 4. The limiting mechanism of the electric actuator provided by the present invention can be designed as an arc-shaped structure, a conical structure, a long groove structure or a through hole structure, so as to realize the lower clutch disc and the upper clutch disc can be quickly positioned and "engaged" together, and can effectively drive the upper clutch disc to rotate.

[0031] 5. The limiting mechanism of the electric actuator provided by the present invention has long grooves radially spaced on the inner wall surface of the housing that abuts against the positioning component, so as to enhance the positioning effect of the upper clutch disc.

[0032] 6. The limiting mechanism of the electric actuator provided by the present invention, wherein the upper clutch disc drives the rotating disc through a transmission mechanism, thereby achieving the smooth operation of the mechanism and improving the transmission accuracy of the limiting mechanism of the electric actuator.

[0033] 7. The electric actuator provided by the present invention, due to the adoption of the above-mentioned limit mechanism, has the advantages of stable and reliable operation, high output shaft positioning accuracy, and effectively protects the switching unit from damage.

[0034] 8. The electric actuator provided by the present invention has a transmission mechanism installed at the lower clutch plate to drive the output shaft of the electric actuator to rotate, thereby achieving the smooth operation of the electric actuator.

[0035] 9. This invention has a simple structure, a scientific and reasonable design, an ingenious concept, accurate positioning, and simple maintenance. The transmission mechanism operates smoothly and reliably, effectively protecting the switching unit from damage. It has the value of widespread application. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the "engaged state" of the limiting mechanism of the electric actuator in this invention application;

[0037] Figure 2 This is a schematic diagram of the "separated state" of the limiting mechanism of the electric actuator in this invention application;

[0038] Figure 3 yes Figure 2 Top view;

[0039] Figure 4 This is a cross-sectional view of the lower clutch disc in this invention application;

[0040] Figure 5 This is a schematic diagram of the clutch assembly in this invention application;

[0041] Figure 6 This is a cross-sectional view of the first type of upper clutch disc in this invention application;

[0042] Figure 7 This is a cross-sectional view of the second type of upper clutch disc in this invention application;

[0043] Figure 8 This is a cross-sectional view of the third type of upper clutch disc in this invention application;

[0044] Figure 9 This is a cross-sectional view of the fourth type of upper clutch disc in this invention application;

[0045] Figure 10 This is a cross-sectional view of the fifth type of upper clutch disc in this invention application;

[0046] Figure 11 This is a schematic diagram of the positioning component in this invention application;

[0047] Figure 12 This is a perspective view of the shell in this invention application;

[0048] Figure 13 This is another perspective view of the shell in this invention application.

[0049] Explanation of reference numerals in the attached figures

[0050] 1. Lower clutch disc; 101. Lower clutch groove; 2. Clutch assembly; 201. Clutch spring; 202. Clutch ball; 3. Upper clutch disc; 301. Positioning groove; 302. Upper clutch groove; 303. Annular groove; 4. First transmission mechanism; 5. Second transmission mechanism; 6. Rotary disc; 7. Contact post; 8. Switch unit; 9. Housing; 901. Long groove; 10. Positioning assembly; 1001. Positioning spring; 1002. Positioning ball; 11. Mounting plate; 12. Output shaft; 13. Third transmission mechanism. Detailed Implementation

[0051] The specific embodiments of this invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this disclosure.

[0052] In the technical solutions disclosed in this invention application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to those defined based on the drawing direction of the corresponding figures, while "inner" and "outer" refer to those inside and outside relative to the outline of the component or structure itself. Furthermore, it should be noted that these terms do not have sequential or importance. Additionally, in the description with reference to the figures, the same reference numerals in different figures denote the same elements.

[0053] According to the first aspect of this application, a limiting mechanism for an electric actuator is provided, such as... Figure 2 and Figure 3As shown, the device includes a rotating disk 6 and a switch unit 8. The rotating disk 6 touches the switch unit 8 after rotating at a preset angle. It also includes a lower clutch disk 1, an upper clutch disk 3, a mounting plate 11, and a housing 9. The lower clutch disk 1 is rotatably mounted on the mounting plate 11. The upper clutch disk 3 is mounted on the upper end of the lower clutch disk 1. The housing 9 is fixed on the mounting plate 11 and surrounds the mounting plate 11 to form a mounting cavity. The upper end of the lower clutch disk 1 and at least a portion of the upper clutch disk 3 are located within the mounting cavity of the housing 9. The upper clutch disk 3 drives the rotating disk 6 to rotate. At least one set of clutch components 2 for separating or engaging the two is provided between the lower clutch disk 1 and the upper clutch disk 3.

[0054] like Figure 1 As shown, in the engaged state: the upper clutch disc 3 is connected to the lower clutch disc 1 as one unit through the clutch assembly 2, and the lower clutch disc 1 and the upper clutch disc 3 rotate together and drive the rotating disc 6 to rotate;

[0055] like Figure 2 As shown, in the separated state: the upper clutch disc 3 is separated from the lower clutch disc 1 through the clutch assembly 2, the lower clutch disc 1 rotates, and the upper clutch disc 3 and the rotating disc 6 stop rotating;

[0056] like Figure 1 , Figure 2 As shown, a positioning component 10 is provided between the upper clutch disc 3 and the inner wall of the housing 9, and the upper clutch disc 3 makes frictional contact with the housing 9 through the positioning component 10.

[0057] In the above technical solution, the upper clutch disc 3 is engaged with the lower clutch disc 1 via the clutch assembly 2, realizing two states: "disengaged" and "engaged" between the lower clutch disc 1 and the upper clutch disc 3. Under normal circumstances, the upper clutch disc 3 drives the rotating disk 6 to rotate. The switching unit 8 is a limit switch or a micro switch, wherein the angle between the open and closed micro switches is usually 90°. When the rotating disk 6 rotates to a preset angle and touches the switching unit 8, the switching unit 8 sends a signal to the control terminal of the actuator, and the lower clutch disc 1, the upper clutch disc 3, and the rotating disk 6 immediately stop rotating or rotate in the opposite direction. Similarly, when the rotating disk 6 rotates in the opposite direction to a preset angle and touches the switching unit 8, it stops operating or rotates in the opposite direction.

[0058] When the lower clutch disc 1 malfunctions and continues to rotate, or when the lower clutch disc 1 is manually driven to rotate: the lower clutch disc 1 connects to the upper clutch disc 3 and drives the rotating disk 6 to rotate. After the contact post 7 fixed on the rotating disk 6 touches the switch unit 8, the lower clutch disc 1 continues to rotate. At this time, the upper clutch disc 3 stops rotating due to the resistance of the switch unit 8 and disengages from the lower clutch disc 1. The rotating disk 6 also stops rotating to prevent it from damaging the switch unit 8, while the lower clutch disc 1 continues to rotate. This limiting mechanism solves the problem of damage to the switch unit 8 caused by the continuous rotation of the contact post 7 due to the malfunction of the lower clutch disc 1 during the operation of related equipment.

[0059] like Figure 1 , Figure 2 As shown, this technical solution also includes a positioning component 10, which is disposed between the upper clutch disc 3 and the inner wall of the housing 9. The purpose of this design is to increase the friction between the upper clutch disc 3 and the inner wall of the housing 9 by using the positioning component 10, that is, the resistance exerted by the housing 9 on the upper clutch disc 3 during its rotation. This ensures that when the lower clutch disc 1 malfunctions and continues to rotate or is manually driven to rotate, after the upper clutch disc 3 disengages from the lower clutch disc 1, the housing 9 uses the positioning component 10 to prevent the upper clutch disc 3 from continuing to rotate in the same direction as the lower clutch disc 1, thus achieving the purpose of stopping the rotation of the upper clutch disc 3 as quickly as possible. The purpose of the housing 9 is also to prevent other parts from accidentally falling onto the upper clutch disc 3 and affecting its rotation, thereby causing equipment malfunction, when the upper clutch disc 3 and the lower clutch disc 1 are rotating.

[0060] The limit mechanism of this electric actuator ensures that the rotating disk 6 stops rotating in time when the relevant equipment malfunctions, thereby protecting the switch unit 8 from being crushed. Finally, the rotation of the lower clutch disk 1 resets the lower clutch disk 1 and the rotating disk 6, effectively reducing maintenance costs, improving maintenance efficiency, and facilitating mass production. The lower clutch disk 1 can be used directly as an output shaft or connected to an output shaft through other transmission mechanisms. Similarly, the upper clutch disk 3 can directly drive the rotating disk 6 or drive it through other transmission mechanisms; no specific limitations are made herein.

[0061] In this embodiment, such as Figure 1 , Figure 2 As shown, the clutch assembly 2 may specifically include an elastic element and an insert, wherein the elastic element is located inside the lower clutch disc 1, and the insert is provided on the top of the elastic element;

[0062] In the engaged state: the lower part of the elastic element and the insert is located in the lower clutch disc 1, and the upper part of the insert is located in the upper clutch disc 3;

[0063] In the disengaged state: the elastic element and the insert are completely located within the lower clutch disc 1.

[0064] In the above scheme, the elastic force of the elastic element is used to compress or extend the elastic element, thereby achieving axial displacement of the embedded element, and ultimately realizing the two states of "disengagement" and "engagement" of the lower clutch disc 1 and the rotating disc 6.

[0065] In this embodiment, specifically, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the elastic element is a clutch spring 201, and the embedded element is a clutch ball 202. The clutch spring 201 is embedded in the lower clutch groove 101 formed on the upper end face of the lower clutch disc 1. The clutch ball 202 is placed on the top of the clutch spring 201. The lower end face of the upper clutch disc 3 is formed with an upper clutch groove 302 for accommodating the clutch ball 202.

[0066] like Figure 3 As shown, after the rotating disk 6 rotates to a preset angle and touches the switch unit 8,

[0067] like Figure 1 As shown, in the engaged state: the clutch ball 202 is embedded in the upper clutch groove 302 of the upper clutch disc 3, the lower clutch disc 1 is coaxially connected with the upper clutch disc 3, and the lower clutch disc 1, the upper clutch disc 3 and the rotating disc 6 all stop rotating.

[0068] like Figure 2 As shown, in the separated state: the rotating disk 6 is resisted by the switching unit 8, the clutch ball 202 disengages from the upper clutch groove 302 in the upper clutch disk 3, the clutch ball 202 contacts the lower end plane of the upper clutch disk 3, the lower clutch disk 1 separates from the upper clutch disk 3, both the upper clutch disk 3 and the rotating disk 6 stop rotating, and the lower clutch disk 1 continues to rotate.

[0069] In the above technical solution, the clutch assembly 2 includes a clutch spring 201 and a clutch ball 202, which cooperate with each other. The axial displacement of the clutch ball 202 realizes the two states of "disengagement" and "engagement" between the lower clutch disc 1 and the rotating disc 6, ensuring the safety of each component and having a simple structure. In some other embodiments, the clutch assembly 2 can also use a ball screw or a ball plunger to replace the clutch spring 201 and the clutch ball 202. Relevant personnel can select appropriate components based on the actual situation of the site environment.

[0070] In this embodiment, such as Figures 6 to 10 As shown, the upper clutch groove 302 can be designed into an arc-shaped structure, a conical structure, a long groove structure, a through hole, or other structures to match the specific shape of the clutch assembly 2, so that the two can be better installed or joined together. This enables the lower clutch disc 1 and the upper clutch disc 3 to be quickly positioned and "engaged" together, effectively driving the upper clutch disc 3 to rotate.

[0071] In this embodiment, such as Figure 1 , Figure 2 As shown, a portion of the positioning component 10 is embedded in the upper clutch disc 3, and another portion contacts the housing 9. The positioning component 10 specifically includes a positioning spring 1001 and a positioning ball 1002. The positioning spring 1001 is embedded in a positioning groove 301 formed in the upper clutch disc 3, and the positioning ball 1002 is positioned on top of the positioning spring 1001. The positioning ball 1002 abuts against the inner wall of the housing 9 by the elastic force of the positioning spring 1001. The positioning groove 301 is typically arranged axially around the upper clutch disc 3 (e.g., ...). Figure 6 (as shown) or a radial arrangement around the upper clutch disc 3 (such as...) Figure 7 As shown in the diagram, correspondingly, the positioning spring 1001 and the positioning ball 1002 are axially or radially embedded in the upper clutch disc 3. In other embodiments, the positioning assembly 10 may also be a ball screw or a ball plunger, etc., and relevant personnel can select the appropriate assembly according to the actual situation on site.

[0072] In some other embodiments, the positioning component 10 may also be an elastic O-ring, such as an elastic rubber ring, which is embedded in the annular groove 303 provided in the upper clutch disc 3. Specifically, the arrangement of the annular groove 303 may include:

[0073] ①For example Figure 8 As shown, the annular groove 303 includes an axial arrangement around the upper clutch disc 3;

[0074] ②For example Figure 9 As shown, the annular groove 303 includes a radial arrangement surrounding the upper clutch disc 3;

[0075] ③ For example Figure 10 As shown, the annular groove 303 is arranged around the edge of the upper end face of the upper clutch disc 3.

[0076] In this embodiment, the inner wall surface of the housing 9 that abuts against the positioning component 10 is a rough surface. For example, multiple elongated grooves (901) may be spaced apart on the inner wall surface of the housing 9, specifically: Figure 7 , Figure 12 As shown, when the positioning assembly 10 is arranged radially around the upper clutch disc 3, several elongated grooves 901 are evenly spaced on the inner wall side of the housing 9; as Figure 6 , Figure 13 As shown, when the positioning component 10 is arranged axially around the upper clutch disc 3, several long grooves 901 are evenly spaced on the upper end face of the inner wall of the housing 9; the uneven design of the inner surface of the housing 9 increases the resistance between the housing 9 and the upper clutch disc 3, thereby enhancing the positioning effect of the upper clutch disc 3.

[0077] In this embodiment, the upper clutch disc 3 may be configured to drive the rotating disc 6 to rotate via at least one stage of transmission mechanism. In some embodiments, such as Figure 1 As shown, the upper clutch disc 3 is connected to the rotary disc 6 via a first transmission mechanism 4 and a second transmission mechanism 5. The multi-stage transmission between the upper clutch disc 3 and the rotary disc 6 ensures smooth operation of the limit mechanism of this electric actuator, thereby improving transmission accuracy. The first transmission mechanism 4 and the second transmission mechanism 5 can be gears, pulleys, sprockets, etc., and are not specifically limited herein.

[0078] Based on the above technical solutions, the second aspect of this application also provides an electric actuator, including all the features of the limiting mechanism of the electric actuator described above, and the lower clutch disc 1 is connected to the output shaft 12 of the electric actuator through at least one stage of transmission mechanism. For example, as Figure 1 As shown, the electric actuator includes a third transmission mechanism 13, which drives the lower clutch disc 1 to rotate and the output shaft 12 to rotate. In this embodiment, the output shaft 12 is used to control the opening and closing of the electric actuator valve, a design that makes this solution more refined and complete. The third transmission mechanism 13 can also be a gear, pulley, sprocket, etc., and this disclosure does not specifically limit it.

[0079] Based on the above technical solution, the method of using the electric actuator is described exemplarily, specifically as follows:

[0080] S1. Start the electric actuator to make the lower clutch plate 1 rotate. The lower clutch plate 1 is connected to the upper clutch plate 3 through the clutch assembly 2 and drives the rotating plate 6 and the contact post 7 fixed on the rotating plate 6 to rotate together towards the switch unit 8. When the contact post 7 touches the switch unit 8, the switch unit 8 sends a signal to the control terminal of the electric actuator, which causes the lower clutch plate 1 to stop rotating.

[0081] S2. When a malfunction occurs or the lower clutch disc 1 is manually driven to rotate, after the contact post 7 touches the switch unit 8, the lower clutch disc 1 continues to rotate in the original direction. At this time, under the resistance of the switch unit 8 on the rotating disc 6, the clutch assembly 2 will disengage from the upper clutch groove 302. Neither the rotating disc 6 nor the upper clutch disc 3 will continue to rotate with the lower clutch disc 1. At the same time, the housing 9 stops the upper clutch disc 3 from rotating through the positioning assembly 10, and only the lower clutch disc 1 continues to rotate in the original direction to avoid the switch unit 8 being damaged by the contact post 7.

[0082] S3. The lower clutch disc 1 is reset. The lower clutch disc 1 is rotated in the forward or reverse direction, and finally reconnected with the upper clutch disc 3 under the action of the clutch assembly 2.

[0083] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details of the above embodiments. Within the scope of the disclosed technical concept, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present application.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0085] Furthermore, various different embodiments of this invention can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this invention.

Claims

1. A limiting mechanism for an electric actuator, comprising a rotary disk (6) and a switching unit (8), wherein the rotary disk (6) rotates by a preset angle and then contacts the switching unit (8), characterized in that, It also includes: lower clutch disc (1), upper clutch disc (3), mounting plate (11), and housing (9); The lower clutch disc (1) is rotatably mounted on the mounting plate (11), and an upper clutch disc (3) is mounted on the upper end of the lower clutch disc (1). The housing (9) is fixed on the mounting plate (11) and surrounds the mounting plate (11) to form a mounting cavity. The upper end of the lower clutch disc (1) and at least a portion of the upper clutch disc (3) are located in the mounting cavity of the housing (9). The upper clutch disc (3) drives the rotating disc (6) to rotate; At least one clutch assembly (2) is provided between the lower clutch disc (1) and the upper clutch disc (3) for separating or engaging the two. In the engaged state: the upper clutch disc (3) is connected to the lower clutch disc (1) through the clutch assembly (2), and the lower clutch disc (1) and the upper clutch disc (3) rotate together and drive the rotating disc (6) to rotate; In the disengaged state: the upper clutch disc (3) is separated from the lower clutch disc (1) through the clutch assembly (2), the lower clutch disc (1) rotates, and the upper clutch disc (3) and the rotating disc (6) stop rotating; A positioning component (10) is provided between the upper clutch disc (3) and the inner wall of the housing (9), and the upper clutch disc (3) makes frictional contact with the housing (9) through the positioning component (10); A portion of the positioning component (10) is embedded in the upper clutch disc (3), and another portion of the positioning component (10) is in contact with the housing (9). The positioning component (10) includes a positioning spring (1001) and a positioning ball (1002). The positioning spring (1001) is embedded in a positioning groove (301) provided in the upper clutch disc (3). The positioning ball (1002) is disposed on the top of the positioning spring (1001), and the positioning ball (1002) abuts against the inner wall of the housing (9).

2. The limiting mechanism of the electric actuator according to claim 1, characterized in that: The clutch assembly (2) includes an elastic element and an insert, the elastic element being located within the lower clutch disc (1), and the insert being disposed on the top of the elastic element; In the engaged state: the lower part of the elastic member and the lower part of the insert are located in the lower clutch disc (1), and the upper part of the insert is located in the upper clutch disc (3); In the separated state: the elastic element and the embedded element are completely located within the lower clutch disc (1).

3. The limiting mechanism of the electric actuator according to claim 2, characterized in that: The elastic element is a clutch spring (201), the insert is a clutch ball (202), the clutch spring (201) is embedded in a lower clutch groove (101) formed on the upper end face of the lower clutch disc (1), the clutch ball (202) is placed on the top of the clutch spring (201), and an upper clutch groove (302) for accommodating the clutch ball (202) is formed on the lower end face of the upper clutch disc (3). In the engaged state: some of the clutch balls (202) are embedded in the upper clutch groove (302) of the upper clutch disc (3) so that the upper clutch disc (3) and the lower clutch disc (1) are engaged as one unit; In the disengaged state: the clutch ball (202) disengages from the upper clutch groove (302) in the upper clutch disc (3), the clutch ball (202) contacts the lower end plane of the upper clutch disc (3), and the lower clutch disc (1) separates from the upper clutch disc (3).

4. The limiting mechanism of the electric actuator according to claim 3, characterized in that: The upper clutch groove (302) can be an arc-shaped structure, a conical structure, a long groove structure, or a through hole structure.

5. The limiting mechanism of the electric actuator according to claim 2, characterized in that: The clutch assembly (2) is a ball screw or a ball plunger.

6. The limiting mechanism of the electric actuator according to claim 1, characterized in that: The inner wall surface of the housing (9) that abuts against the positioning component (10) is a rough surface.

7. The limiting mechanism of the electric actuator according to any one of claims 1-6, characterized in that: The upper clutch disc (3) drives the rotating disc (6) to rotate through at least one stage of transmission mechanism.

8. An electric actuator, characterized in that, include: The limiting mechanism of the electric actuator as described in any one of claims 1-7, wherein the lower clutch disc (1) is connected to the output shaft (12) of the electric actuator through at least one stage of transmission mechanism.

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