CN219300064U - Limiting mechanism of electric actuator and electric actuator - Google Patents

Abstract

The utility model discloses a limiting mechanism of an electric actuator and the electric actuator, which comprise a rotating disk and a switch unit, wherein the rotating disk rotates for a preset angle and then touches the switch unit; comprising the following steps: the device comprises a lower clutch disc, an upper clutch disc, a mounting plate and a shell; the lower clutch disc is rotationally arranged on the mounting plate, the upper end part of the lower clutch disc is provided with the upper clutch disc, the shell is fixedly arranged on the mounting plate and is enclosed with the mounting plate to form a mounting cavity, and the upper end part of the lower clutch disc and at least part of the upper clutch disc are positioned in the mounting cavity of the shell; the upper clutch disc drives the rotating disc to rotate; at least one group of clutch components for separating or connecting the lower clutch plate and the upper clutch plate are arranged between the lower clutch plate and the upper clutch plate. The problem that when the electric actuator breaks down and the rotating disc continuously rotates or the clutch disc is manually driven to rotate in the related art is solved, the rotating disc bumps the switch unit. The lower clutch disc, the upper clutch disc and the rotating disc are separated through the clutch assembly, so that the rotating disc stops rotating, and finally the aim of protecting the switch unit is fulfilled.

Description

Limiting mechanism of electric actuator and electric actuator

Technical Field

The utility model belongs to the field of electric actuators, and particularly relates to a limiting mechanism of an electric actuator and the electric actuator.

Background

As industrial production increasingly employs automated control, manual operations are increasingly being replaced by mechanical or automated equipment. Among them, electric actuators are widely used in daily work with high stability, and people use electric actuators while continuously enhancing their work safety. The main function of the output shaft limiting device is to control the rotation angle of the output shaft of the actuator, and then control the switch position of the driven valve.

The output shaft limiting device of the existing electric actuator mainly comprises an output shaft, a rotating disc, an opening micro switch and a closing micro switch. The rotary disk is installed on the upper portion of the output shaft, the radial side edge of the rotary disk is provided with an opening micro switch and a closing micro switch respectively, when the output shaft rotates in the valve opening direction in the axial direction, the rotary disk rotates along with the output shaft, and after the touch column on the rotary disk touches the opening micro switch, the output shaft stops and is opened in place. When the output shaft rotates in the valve closing direction, the rotary disk rotates along with the output shaft, and when the touch column touches the closing micro switch, the output shaft stops and closes in place. The device is convenient to debug, high in efficiency and suitable for mass production.

The prior art also provides an output shaft positioning device of the electric actuator, which comprises an output shaft, a cam, an opening micro-switch and a closing micro-switch, wherein the cam is arranged on the output shaft and can rotate together, the opening micro-switch and the closing micro-switch are respectively arranged on two sides of the cam, and when the output shaft rotates in the axial valve opening direction, the cam touches the opening micro-switch, and then the output shaft stops and is opened in place. When the output shaft rotates in the valve closing direction, the output shaft stops and closes in place after the cam contacts the closing position micro switch.

However, both of the above-mentioned conventional electric actuators have significant drawbacks:

(1) When the output shaft of the electric actuator is in place after being opened or closed, if the electric actuator fails or is manually driven to rotate, the output shaft can continue to rotate along the original direction, and the micro switch has the risk of being crushed;

(2) The latter existing electric actuator has the disadvantage that the cam is troublesome in debugging and has low working efficiency.

Therefore, there is a need for an electric actuator limiting device that is easy to operate and convenient to debug, and is used for preventing the output shaft from exceeding the limit protection position when the electric actuator fails and is manually operated.

Disclosure of Invention

The utility model provides a limiting mechanism of an electric actuator and the electric actuator, so as to solve the problems in the prior art.

In order to achieve the above object, a first aspect of the present utility model provides a limiting mechanism of an electric actuator, including a rotating disc and a switch unit, wherein the rotating disc rotates a preset angle and then touches the switch unit, and further includes: the device comprises a lower clutch disc, an upper clutch disc, a mounting plate and a shell; the upper end part of the lower clutch disc and at least part of the upper clutch disc are positioned in the mounting cavity of the shell; the upper clutch disc drives the rotating disc to rotate; at least one group of clutch components for separating or connecting the lower clutch disc and the upper clutch disc are arranged between the lower clutch disc and the upper clutch disc;

under the state of connection: the upper clutch plate is connected with the lower clutch plate into a whole through the clutch assembly, and the lower clutch plate and the upper clutch plate rotate together and drive the rotating disc to rotate;

in the separated state: the upper clutch plate is separated from the lower clutch plate through the clutch assembly, the lower clutch plate rotates, and the upper clutch plate and the rotating disc stop rotating;

a positioning component is arranged between the upper clutch disc and the inner wall of the shell, and the upper clutch disc is in friction contact with the shell through the positioning component.

Further, the clutch assembly comprises an elastic piece and an embedded piece, the elastic piece is positioned in the lower clutch disc, and the embedded piece is arranged at the top of the elastic piece; under the state of connection: the elastic piece and the lower part of the embedded piece are positioned in the lower clutch disc, and the upper part of the embedded piece is positioned in the upper clutch disc;

in the separated state: the elastic member and the insert are located entirely within the lower clutch plate.

Further, the elastic piece is a clutch spring, the embedded piece is a clutch ball, the clutch spring is embedded in a lower clutch groove formed in the upper end face of the lower clutch disc, the clutch ball is placed at the top of the clutch spring, and an upper clutch groove for accommodating the clutch ball is formed in the lower end face of the upper clutch disc;

under the state of connection: part of clutch balls are embedded into an upper clutch groove of an upper clutch disc so as to enable the upper clutch disc and a lower clutch disc to be connected into a whole;

in the separated state: the clutch ball is separated from the upper clutch groove in the upper clutch disc, the clutch ball is contacted with the lower end plane of the upper clutch disc, and the lower clutch disc is separated from the upper clutch disc.

Further, the upper clutch groove can be of an arc-shaped structure, a conical structure, a long groove structure or a through hole structure.

Further, the clutch component is a ball screw or a ball plunger.

Further, one part of the positioning component is embedded in the upper clutch disc, the other part of the positioning component is in contact with the shell, the positioning component comprises a positioning spring and a positioning ball, the positioning spring is embedded in a positioning groove formed in the upper clutch disc, the top of the positioning spring is provided with the positioning ball, and the positioning ball abuts against the inner wall of the shell.

Further, the positioning component is an elastic O-shaped ring, and the elastic O-shaped ring is embedded in an annular groove formed in the upper end face of the upper clutch disc, or at the edge of the upper end face, or on the side face.

Further, the surface of the inner wall of the shell, which is abutted against the positioning component, is a rough surface.

Further, the upper clutch plate drives the rotating plate to rotate through at least one stage of transmission mechanism.

The second aspect of the utility model provides an electric actuator, comprising the limiting mechanism of the electric actuator, wherein the lower clutch disc is connected with an output shaft of the electric actuator through at least one stage of transmission mechanism.

The utility model has the advantages and positive effects that:

1. according to the limiting mechanism of the electric actuator, two states of 'off' and 'on' of the lower clutch disc and the upper clutch disc are realized through the clutch assembly, and in a normal working state, the lower clutch disc drives the upper clutch disc and finally drives the rotating disc to rotate; when the actuator fails, the rotary disk continuously rotates or manually drives the lower clutch disk to rotate, the lower clutch disk is separated from the upper clutch disk and the rotary disk, and the rotary disk stops rotating to prevent the rotary disk from damaging the switch unit. The limiting mechanism ensures that the rotating disc stops rotating when a fault occurs, so that the switch unit is protected from being damaged, and finally, the lower clutch disc and the rotating disc reset through the lower clutch disc rotation, so that the maintenance cost is effectively reduced, and the maintenance efficiency is improved.

2. According to the limiting mechanism of the electric actuator, the clutch spring in the clutch assembly is matched with the clutch balls, and the two states of 'off' and 'on' of the lower clutch disc and the upper clutch disc are realized through axial displacement of the clutch balls.

3. According to the limiting mechanism of the electric actuator, the upper clutch disc is kept static after the lower clutch disc is separated from the upper clutch disc through the positioning assembly, and the positioning assembly can comprise a metal spring, a ball, a nonmetal elastic rubber ring and the like. The purpose is to increase the movement resistance between the upper clutch plate and the shell, thereby realizing the purpose of enabling the upper clutch plate to be rapidly stationary after being separated from the lower clutch plate.

4. According to the limiting mechanism of the electric actuator, the clutch groove can be designed into an arc-shaped structure, a conical structure, a long groove structure or a through hole structure, so that the lower clutch disc and the upper clutch disc can be rapidly positioned and are combined together, and the upper clutch disc can be effectively driven to rotate.

5. According to the limiting mechanism of the electric actuator, the long grooves are formed in the inner wall surface of the shell, which abuts against the positioning assembly, at radial intervals, so that the positioning effect of the upper clutch disc is enhanced.

6. According to the limiting mechanism of the electric actuator, the upper clutch disc drives the rotating disc through the transmission mechanism, so that the running stability of the mechanism is realized, and the transmission precision of the limiting mechanism of the electric actuator is improved.

7. The electric actuator provided by the utility model has the advantages of stable and reliable operation and high positioning precision of the output shaft due to the adoption of the limiting mechanism of the electric actuator, and the switch unit is effectively protected from being damaged.

8. According to the electric actuator provided by the utility model, the transmission mechanism is arranged at the lower clutch disc to drive the output shaft of the electric actuator to rotate, so that the running stability of the electric actuator is realized.

9. The utility model has simple structure, scientific and reasonable design, ingenious conception, accurate positioning, simple maintenance, stable and reliable operation of the transmission mechanism, effectively protects the switch unit from being damaged and has wide popularization and application values.

Drawings

FIG. 1 is a schematic view of the structure of a limiting mechanism "on-state" of an electric actuator according to the present utility model;

FIG. 2 is a schematic view of the structure of the limiting mechanism of the electric actuator in the "separated state" of the present utility model;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a cross-sectional view of the lower clutch plate of the present utility model;

FIG. 5 is a schematic view of the clutch assembly of the present utility model;

FIG. 6 is a cross-sectional view of a first upper clutch plate of the present utility model;

FIG. 7 is a cross-sectional view of a second upper clutch plate of the present utility model;

FIG. 8 is a cross-sectional view of a third upper clutch plate of the present utility model;

FIG. 9 is a cross-sectional view of a fourth upper clutch plate of the present utility model;

FIG. 10 is a cross-sectional view of a fifth upper clutch plate of the present utility model;

FIG. 11 is a schematic view of a positioning assembly of the present utility model;

FIG. 12 is a perspective view of the housing of the present utility model;

fig. 13 is another perspective view of the housing of the present utility model.

Description of the reference numerals

1. A lower clutch plate; 101. a lower clutch groove; 2. a clutch assembly; 201. a clutch spring; 202. clutch balls; 3. an upper clutch plate; 301. a positioning groove; 302. an upper clutch groove; 303. an annular groove; 4. a first transmission mechanism; 5. a second transmission mechanism; 6. a rotating disc; 7. touching the column; 8. a switching unit; 9. a housing; 901. a long groove; 10. a positioning assembly; 1001. a positioning spring; 1002. positioning the ball; 11. a mounting plate; 12. an output shaft; 13. and a third transmission mechanism.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the technical solutions disclosed in the present utility model, unless otherwise stated, terms such as "upper, lower, left and right" are generally defined with reference to the direction of the drawing plane of the corresponding drawing, and "inner and outer" are defined with reference to the inner and outer sides of the outline of the component or structure itself. In addition, the sequence and the importance are not possessed. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

According to the first aspect of the present utility model, as shown in fig. 2 and 3, a limit mechanism of an electric actuator includes a rotating disc 6 and a switch unit 8, and the rotating disc 6 rotates a preset angle and then touches the switch unit 8, and further includes: a lower clutch plate 1, an upper clutch plate 3, a mounting plate 11 and a shell 9; the lower clutch disc 1 is rotatably arranged on the mounting plate 11, the upper end part of the lower clutch disc 1 is provided with the upper clutch disc 3, the shell 9 is fixedly arranged on the mounting plate 11 and forms a mounting cavity with the mounting plate 11 in a surrounding manner, and the upper end part of the lower clutch disc 1 and at least part of the upper clutch disc 3 are positioned in the mounting cavity of the shell 9; the upper clutch disc 3 drives the rotary disc 6 to rotate; at least one group of clutch components 2 for separating or connecting the lower clutch disc 1 and the upper clutch disc 3 are arranged between the two;

as shown in fig. 1, in the connected state: the upper clutch disc 3 is connected with the lower clutch disc 1 through the clutch assembly 2 into a whole, and the lower clutch disc 1 and the upper clutch disc 3 rotate together and drive the rotating disc 6 to rotate;

as shown in fig. 2, in the separated state: the upper clutch plate 3 is separated from the lower clutch plate 1 through the clutch assembly 2, the lower clutch plate 1 rotates, and the upper clutch plate 3 and the rotating disc 6 stop rotating;

as shown in fig. 1 and 2, a positioning assembly 10 is arranged between the upper clutch disc 3 and the inner wall between the housing 9, and the upper clutch disc 3 is in friction contact with the housing 9 through the positioning assembly 10.

In the above technical scheme, the upper clutch plate 3 is in clutch connection with the lower clutch plate 1 through the clutch assembly 2, so that two states of 'off' and 'on' of the lower clutch plate 1 and the upper clutch plate 3 are realized. Under normal conditions, the upper clutch disc 3 drives the rotating disc 6 to rotate, the switch unit 8 is a limit switch or a micro switch, wherein the included angle between the open micro switch and the close micro switch is usually 90 degrees, when the rotating disc 6 rotates to a preset angle and then touches the switch unit 8, after the switch unit 8 sends a signal to the control end of the actuator, the lower clutch disc 1, the upper clutch disc 3 and the rotating disc 6 immediately stop rotating or reversely rotate; similarly, when the rotary disk 6 rotates reversely by a predetermined angle, the switch unit 8 is touched and then stops operating or rotates reversely.

And when the lower clutch disc 1 fails to continue rotation or the lower clutch disc 1 is manually driven to rotate for operation: the lower clutch disc 1 is connected with the upper clutch disc 3 and drives the rotating disc 6 to rotate, after the touch column 7 fixedly arranged on the rotating disc 6 touches the switch unit 8, the lower clutch disc 1 still continuously rotates, at the moment, the upper clutch disc 3 stops rotating and is separated from the lower clutch disc 1 due to the resistance of the switch unit 8, the rotating disc 6 also immediately stops rotating so as to prevent the switch unit 8 from being damaged, and the lower clutch disc 1 continuously rotates. The limiting mechanism solves the problem that when special conditions occur in the operation process of related equipment, for example, when the lower clutch disc 1 fails and continuously rotates, the touch column 7 is driven to continuously rotate, so that the switch unit 8 is broken.

As shown in fig. 1 and 2, the present technical solution further includes a positioning assembly 10, wherein the positioning assembly 10 is disposed between the upper clutch disc 3 and the inner wall of the housing 9, and the purpose of the design is to increase the friction between the upper clutch disc 3 and the inner wall of the housing 9 by using the positioning assembly 10, that is, the resistance applied to the upper clutch disc 3 by the housing 9 in the rotating process of the upper clutch disc 3, so that when the lower clutch disc 1 fails to continuously rotate or the lower clutch disc 1 is manually driven to rotate, the upper clutch disc 3 is separated from the lower clutch disc 1, and then the housing 9 uses the positioning assembly 10 to make the upper clutch disc 3 not continuously rotate along with the rotating direction of the lower clutch disc 1, so as to achieve the purpose that the upper clutch disc 3 stops rotating as soon as possible. The purpose of providing the housing 9 also includes preventing other parts from accidentally falling onto the upper clutch plate 3 to affect its rotation and, in turn, causing the device to fail when the upper clutch plate 3 and the lower clutch plate 1 are rotated.

The limiting mechanism of the electric actuator ensures that the rotating disc 6 stops rotating in time when related equipment fails so as to protect the switch unit 8 from being crushed, and finally the lower clutch disc 1 and the rotating disc 6 are reset through the rotation of the lower clutch disc 1, so that the maintenance cost is effectively reduced, the maintenance efficiency is improved, and the large-scale production is convenient. The lower clutch disc 1 may be directly used as an output shaft, or may be connected to the output shaft through other transmission mechanisms, and the upper clutch disc 3 may also directly drive the rotating disc 6 to rotate, or may drive the rotating disc 6 through other transmission mechanisms, which are not particularly limited in this disclosure.

In this embodiment, as shown in fig. 1 and 2, the clutch assembly 2 may specifically include an elastic member and an insert member, where the elastic member is located in the lower clutch disc 1, and the top of the elastic member is provided with the insert member;

under the state of connection: the lower parts of the elastic piece and the embedded piece are positioned in the lower clutch disc 1, and the upper part of the embedded piece is positioned in the upper clutch disc 3;

in the separated state: the elastic member and the insert are located entirely within the lower clutch disc 1.

In the above-mentioned scheme, the elastic member is compressed or extended by the elastic force of the elastic member, and thus the axial displacement of the insert is realized, so that the two states of "off" and "on" of the lower clutch disc 1 and the rotating disc 6 are finally realized.

In this embodiment, specifically, as shown in fig. 1, 2, 4 and 5, the elastic member is a clutch spring 201, the embedded member is a clutch ball 202, the clutch spring 201 is embedded in a lower clutch groove 101 formed at the upper end surface of the lower clutch disc 1, the clutch ball 202 is placed on top of the clutch spring 201, and an upper clutch groove 302 for accommodating the clutch ball 202 is formed at the lower end surface of the upper clutch disc 3;

as shown in fig. 3, after the rotary disk 6 is rotated to a preset angle and then the switch unit 8 is touched,

as shown in fig. 1, in the connected state: the clutch balls 202 are embedded into the upper clutch grooves 302 of the upper clutch disc 3, the lower clutch disc 1 and the upper clutch disc 3 are coaxially connected together, and the lower clutch disc 1, the upper clutch disc 3 and the rotating disc 6 stop rotating;

as shown in fig. 2, in the separated state: the rotating disk 6 receives the resistance of the switch unit 8, the clutch balls 202 are separated from the upper clutch grooves 302 in the upper clutch disk 3, the clutch balls 202 are contacted with the lower end plane of the upper clutch disk 3, the lower clutch disk 1 is separated from the upper clutch disk 3, the upper clutch disk 3 and the rotating disk 6 stop rotating, and the lower clutch disk 1 continues rotating.

In the above technical solution, the clutch assembly 2 includes the clutch spring 201 and the clutch ball 202, which are mutually matched, and the two states of "off" and "on" of the lower clutch disc 1 and the rotating disc 6 are realized through the axial displacement of the clutch ball 202, so as to ensure the safety of each component, and the structure is simple. In some other embodiments, the clutch assembly 2 may also replace the clutch spring 201 and the clutch ball 202 with a ball screw or a ball plunger, and the relevant staff may select appropriate components according to the actual situation of the field environment.

In this embodiment, as shown in fig. 6 to 10, the design of the upper clutch groove 302 may be designed into an arc structure, a cone structure, a long groove structure, a through hole and the like, which are matched with each other according to the specific shape of the clutch assembly 2, so that the two structures are embedded or connected with each other with better effect. The lower clutch disc 1 and the upper clutch disc 3 are quickly positioned and 'closed' together, and the upper clutch disc 3 can be effectively driven to rotate.

In this embodiment, as shown in fig. 1 and 2, a part of the positioning assembly 10 is embedded in the upper clutch disc 3, another part of the positioning assembly 10 contacts with the housing 9, the positioning assembly 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, meanwhile, the positioning ball 1002 is disposed on top of the positioning spring 1001, the positioning ball 1002 abuts against an inner wall contacting with the housing 9 by the elastic force of the positioning spring 1001, and the positioning groove 301 is disposed in a manner generally including: around the axial arrangement of the upper clutch disc 3 (as shown in fig. 6) or around the radial arrangement of the upper clutch disc 3 (as shown in fig. 7), the positioning springs 1001 and the positioning balls 1002 are embedded in the upper clutch disc 3 axially or radially, respectively. In other embodiments, the positioning assembly 10 may be a ball screw or a ball plunger, and the related staff may select a proper assembly according to the actual situation of the site.

In some other embodiments, the positioning assembly 10 may also select an elastomeric O-ring, such as: an elastic rubber ring is embedded in an annular groove 303 formed on the upper clutch plate 3. Specifically, the arrangement of the annular groove 303 may include:

(1) as shown in fig. 8, the annular groove 303 includes an arrangement around the axial direction of the upper clutch disc 3;

(2) as shown in fig. 9, the annular groove 303 includes a radial arrangement around the upper clutch plate 3;

(3) as shown in fig. 10, the annular groove 303 includes a manner of being disposed around the upper end surface edge of the upper clutch disc 3.

In the present embodiment, the inner wall surface of the housing 9 abutting against the positioning member 10 is a rough surface. For example, a plurality of long grooves (901) may be formed at intervals on the inner wall surface of the housing 9, specifically: as shown in fig. 7 and 12, when the positioning assembly 10 is arranged around the radial direction of the upper clutch disc 3, a plurality of long grooves 901 are uniformly arranged at intervals on the side surface of the inner wall of the housing 9; as shown in fig. 6 and 13, when the positioning assembly 10 is arranged around the axial direction of the upper clutch disc 3, a plurality of long grooves 901 are uniformly arranged at intervals on the upper end surface of the inner wall of the housing 9; the uneven design of the inner surface of the shell 9 increases the resistance between the shell 9 and the upper clutch disc 3, thereby enhancing the positioning effect on the upper clutch disc 3.

In the present embodiment, the upper clutch plate 3 may be provided to drive the rotary plate 6 to rotate by at least one stage of transmission mechanism. In some embodiments, as shown in fig. 1, the upper clutch plate 3 is in driving connection with the rotating plate 6 through a first driving mechanism 4 and a second driving mechanism 5. The multistage transmission is arranged between the upper clutch disc 3 and the rotating disc 6, so that the running stability of the limiting mechanism of the electric actuator is realized, and the transmission precision is improved. The first transmission mechanism 4 and the second transmission mechanism 5 may be gears, pulleys, sprockets, etc., which are not particularly limited herein.

On the basis of the technical scheme, the second aspect of the utility model also provides an electric actuator, which comprises all the characteristics of the limiting mechanism of the electric actuator, and the lower clutch disc 1 is connected with the output shaft 12 of the electric actuator through at least one stage of transmission mechanism. For example, as shown in fig. 1, the electric actuator includes a third transmission mechanism 13, and the third transmission mechanism 13 is used to drive the lower clutch disc 1 to rotate and drive 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, and this design makes the present solution finer and more complete. The third transmission mechanism 13 may also be a gear, a pulley, a sprocket, etc., which is not specifically limited herein.

On the basis of the technical scheme, the use method of the electric actuator is exemplarily described, and the method specifically comprises the following steps of:

s1, starting an electric actuator to enable a lower clutch disc 1 to rotate, connecting the lower clutch disc 1 with an upper clutch disc 3 through a clutch assembly 2 and driving a rotating disc 6 and a touch column 7 fixedly arranged on the rotating disc 6 to rotate towards a switch unit 8 together, and after the touch column 7 touches the switch unit 8, the switch unit 8 sends a signal to a control end of the electric actuator, and the signal enables the lower clutch disc 1 to stop rotating;

s2, when a fault occurs or the lower clutch disc 1 is manually driven to rotate, after the touch column 7 touches the switch unit 8, the lower clutch disc 1 still keeps rotating along the original rotation direction, at the moment, under the action of the resistance of the switch unit 8 to the rotating disc 6, the clutch assembly 2 is separated from the upper clutch groove 302, the rotating disc 6 and the upper clutch disc 3 do not rotate continuously along with the lower clutch disc 1 any more, meanwhile, the shell 9 stops rotating the upper clutch disc 3 through the positioning assembly 10, and only the lower clutch disc 1 continuously rotates along the original direction, so that the switch unit 8 is prevented from being damaged by the touch column 7;

s3, resetting the lower clutch disc 1, and finally reconnecting the lower clutch disc 1 and the upper clutch disc 3 together under the action of the clutch assembly 2 through forward rotation or reverse rotation of the lower clutch disc 1.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present utility model within the scope of the disclosed technical concept, and all the simple modifications belong to the protection scope of the present application.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in detail.

Moreover, any combination of the various embodiments of the utility model can be made without departing from the spirit of the disclosure, which should also be considered as the disclosure of the utility model.

Claims (10)

1. The utility model provides a stop gear of electric actuator, includes rotary disk (6) and switch unit (8), touch behind rotary disk (6) rotatory preset angle switch unit (8), its characterized in that still includes: the clutch comprises a lower clutch disc (1), an upper clutch disc (3), a mounting plate (11) and a shell (9);

the lower clutch disc (1) is rotatably mounted on the mounting plate (11), the upper end part of the lower clutch disc (1) is provided with an upper clutch disc (3), the shell (9) is fixedly mounted on the mounting plate (11) and forms a mounting cavity with the mounting plate (11) in a surrounding manner, and the upper end part of the lower clutch disc (1) and at least part of the upper clutch disc (3) are positioned in the mounting cavity of the shell (9);

the upper clutch disc (3) drives the rotating disc (6) to rotate;

at least one group of clutch components (2) for separating or connecting the lower clutch disc (1) and the upper clutch disc (3) is arranged between the lower clutch disc and the upper clutch disc;

under the state of connection: the upper clutch disc (3) is connected with the lower clutch disc (1) into a whole 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 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;

a positioning assembly (10) is arranged between the upper clutch disc (3) and the inner wall of the shell (9), and the upper clutch disc (3) is in friction contact with the shell (9) through the positioning assembly (10).

2. The limit mechanism of an electric actuator of claim 1, wherein: the clutch assembly (2) comprises an elastic piece and an embedded piece, wherein the elastic piece is positioned in the lower clutch disc (1), and the embedded piece is arranged at the top of the elastic piece;

under the state of connection: the elastic piece and the lower part of the embedded piece are positioned in the lower clutch disc (1), and the upper part of the embedded piece is positioned in the upper clutch disc (3);

in the separated state: the elastic element and the insert are located entirely within the lower clutch disc (1).

3. The limit mechanism of the electric actuator according to claim 2, wherein: the elastic piece is a clutch spring (201), the embedded piece is a clutch ball (202), the clutch spring (201) is embedded in a lower clutch groove (101) formed in the upper end face of the lower clutch disc (1), the clutch ball (202) is placed at the top of the clutch spring (201), and an upper clutch groove (302) for accommodating the clutch ball (202) is formed in the lower end face of the upper clutch disc (3);

under the state of connection: part of the clutch balls (202) are embedded into the upper clutch grooves (302) of the upper clutch disc (3) so as to integrate the upper clutch disc (3) and the lower clutch disc (1);

in the separated state: the clutch balls (202) are separated from the upper clutch grooves (302) in the upper clutch disc (3), the clutch balls (202) are in contact with the lower end plane of the upper clutch disc (3), and the lower clutch disc (1) is separated from the upper clutch disc (3).

4. A spacing mechanism for an electric actuator as claimed in claim 3, wherein: the upper clutch groove (302) can be of an arc-shaped structure, a conical structure, a long groove structure or a through hole structure.

5. The limit mechanism of the electric actuator according to claim 2, wherein: the clutch component (2) is a wave ball screw or a ball plunger.

6. The limit mechanism of an electric actuator of claim 1, wherein: a part of the positioning component (10) is embedded in the upper clutch disc (3), the other part of the positioning component (10) is contacted with the shell (9), the positioning component (10) comprises 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), the top of the positioning spring (1001) is provided with the positioning ball (1002), and the positioning ball (1002) abuts against the inner wall of the shell (9).

7. The limit mechanism of an electric actuator of claim 1, wherein: the positioning assembly (10) is an elastic O-shaped ring, and the elastic O-shaped ring is embedded in an annular groove (303) formed in the upper end face or the edge of the upper end face or the side face of the upper clutch disc (3).

8. The limit mechanism of an electric actuator of claim 1, wherein: an inner wall surface of the shell (9) propped against the positioning component (10) is a rough surface.

9. The limit mechanism of an electric actuator according to any one of claims 1-8, wherein: the upper clutch disc (3) drives the rotating disc (6) to rotate through at least one stage of transmission mechanism.

10. An electric actuator, comprising: the limit mechanism of an electric actuator according to any one of claims 1-9, wherein the lower clutch disc (1) is connected to an output shaft (12) of the electric actuator via at least one stage of transmission mechanism.

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