CN222067738U - High-precision electric actuator - Google Patents

Abstract

The utility model relates to the technical field of actuators, and in particular to a high-precision electric actuator, including a housing, a motor, a transmission mechanism and an actuator, wherein the motor and the transmission mechanism are both assembled in the housing, the output shaft of the motor is connected to the transmission mechanism for accurately transmitting the motion state of the motor, one end of the actuator is assembled in the housing and connected to the transmission mechanism, and the other end rotates out of the housing for accurately executing the motion state of the motor; the actuator includes a driven gear, an actuator shaft and a feedback member, the driven gear is rotatably assembled in the transmission mechanism and connected to the transmission mechanism, one end of the actuator shaft is fixedly assembled on the driven gear, the feedback member is assembled at the actuator shaft and connected to the motor signal. The purpose is to not only achieve high precision, but also to prevent the influence of water/gas on precision instruments and reduce the requirements for waterproofness and sealing.

Description

High-precision electric actuator

Technical Field

The utility model relates to the technical field of actuators, in particular to a high-precision electric actuator.

Background

The most broad definition for an actuator is: a driving device capable of providing linear or rotary motion, which uses a driving energy and operates under a control signal. The actuator uses a liquid, gas, electric or other energy source and converts it into a driving action by a motor, cylinder or other means, the basic actuator being used to drive the valve to a fully open or fully closed position. The actuator for controlling the valve can accurately move the valve to any position.

Currently, some actuators control the accuracy of the actuator by controlling the rotation angle of the motor, or some actuators control the accuracy of the actuator by providing a micro switch, or improve the accuracy of the actuator by improving the accuracy of a control circuit. However, when the motor outputs power, a working gap exists, so that the influence of water/gas on the relatively precise instruments is easy to cause, the service life is influenced, and the requirements on water resistance and tightness are higher.

Disclosure of utility model

In view of the above, an object of the present utility model is to provide a high-precision electric actuator which is high in precision, can prevent water/gas from affecting a precision instrument, and reduces the requirements for water resistance and sealing.

The utility model solves the technical problems by the following technical means:

The high-precision electric actuator comprises a shell, a motor, a transmission mechanism and an actuating mechanism, wherein the motor and the transmission mechanism are assembled in the shell, an output shaft of the motor is in transmission connection with the transmission mechanism and used for precisely transmitting the motion state of the motor, one end of the actuating mechanism is assembled in the shell and in transmission connection with the transmission mechanism, and the other end of the actuating mechanism rotates to penetrate through the shell and is used for precisely actuating the motion state of the motor;

The actuating mechanism comprises a driven gear, an actuating shaft and a feedback piece, wherein the driven gear is rotationally assembled in the transmission mechanism and is in transmission connection with the transmission mechanism, one end of the actuating shaft is fixedly assembled on the driven gear, and the feedback piece is assembled at the actuating shaft and is in signal connection with the motor.

Further, the transmission mechanism comprises a mounting plate and a transmission assembly, wherein the mounting plate is assembled in the shell, and the transmission assembly is assembled on one side of the mounting plate and is in transmission connection with an output shaft of the motor.

According to the technical means, the stable installation of the transmission assembly is facilitated through the cooperation of the installation plate and the shell.

Further, the transmission assembly comprises a first fixed plate, a second fixed plate and a gear set, wherein the gear set is assembled between the first fixed plate and the second fixed plate, and an output shaft of the motor is in transmission connection with the gear set.

According to the technical means, the first fixing plate and the second fixing plate provide a mounting base for the gear set and a mounting base for the actuating mechanism.

Further, the gear set includes a main gear fixedly mounted on an output shaft of the motor, a pinion gear rotatably mounted between the first and second fixed plates, and a ring gear engaged between the main gear and the ring gear.

According to the technical means, the transmission of the motor is more accurate through the mutual matching of the main gear, the auxiliary gear and the gear ring.

Further, the execution shaft is sleeved with an installation seat, and one end of the feedback piece is assembled on the installation seat in a sealing mode.

According to the technical means, on one hand, the installation of the execution block is convenient; on the other hand, the sealability at the actuating shaft is improved.

Further, the feedback piece includes drive block, sleeve, shutoff piece and detection piece, it has the screw thread to carry out epaxial, drive block spiro union is epaxial in the execution, the shutoff piece cup joints epaxial in the execution to form the enclosure with the execution, it has liquid to pour into in the enclosure, sleeve cover is established at drive block and shutoff piece, sleeve fixed connection is on drive mechanism, the one end intercommunication of detection piece is in the enclosure, and the other end sets up in the casing, and with motor signal connection.

According to the technical means, through the mutual matching of the transmission block, the sleeve, the plugging block and the detection piece, the motion of the execution shaft can be accurately detected when the execution shaft works.

Further, sliding blocks are symmetrically arranged on the transmission blocks, sliding grooves are symmetrically arranged on the inner walls of the sleeves, and the sliding blocks are located in the sliding grooves.

According to the technical means, the transmission block is more stable when moving up and down along the execution shaft.

Further, the detecting piece includes pipeline, detection head and detection seat, the one end intercommunication of pipeline is in the enclosure space, and the other end is assembled in the casing, detection seat fixed assembly is in the casing, the detection head is assembled on detecting the seat for detect the liquid position in the pipeline.

According to the technical means, through the mutual matching of the pipeline, the detection head and the detection seat, the liquid quantity in the closed space can be accurately detected when the shaft is operated, so that the motor is feedback controlled, and the control precision of the motor is improved.

Further, the pipeline is provided with scale marks.

According to the technical means, the detection is more accurate.

Further, the shell comprises an upper shell and a lower shell, the upper shell and the lower shell are detachably and fixedly connected, and the tail end of the executing shaft penetrates out of the upper shell.

According to the technical means, the assembly of the motor, the transmission mechanism and the execution mechanism is facilitated.

The application adopting the scheme has the following advantages:

1. Through the mutual matching of the motor, the transmission mechanism and the execution mechanism, on one hand, the transmission precision of the motor output shaft can be improved through the transmission mechanism, the working progress of the execution mechanism can be improved through the high-precision transmission of the transmission mechanism, and the motion precision of the electric actuator can be further improved through the high-precision motion of the execution mechanism; on the other hand, the shell is matched, so that the influence of water/gas on a precise instrument can be prevented, and the requirements on water resistance and tightness are reduced;

2. The transmission mechanism is arranged to be the mounting plate, the first fixing plate, the second fixing plate and the gear set, so that on one hand, the assembly is convenient; on the other hand, the transmission precision of the motor output shaft can be enhanced, and the practicability is enhanced;

3. Through setting up actuating mechanism into driven gear, actuating shaft and feedback spare, at the drive mechanism during operation, can drive the actuating shaft work through driven gear, at the actuating shaft during operation, through the rotation of feedback spare further feedback control motor output shaft to further promote the work precision of executor, and through setting up the cooperation of actuating shaft and feedback spare, can reduce the actuating shaft at the during operation, reduce the influence of water/gas to the feedback spare, reduce the requirement to waterproof nature and leakproofness.

Drawings

The utility model can be further illustrated by means of non-limiting examples given in the accompanying drawings;

FIG. 1 is a schematic diagram of a high-precision electric actuator in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a high-precision electric actuator in accordance with an embodiment of the present application;

FIG. 3 is an enlarged schematic view of the structure of FIG. 2 at A;

FIG. 4 is a schematic illustration of a portion of an actuator assembly according to an embodiment of the present application;

FIG. 5 is a second schematic view of a portion of an actuator assembly according to an embodiment of the present application;

a prime symbol description;

1. A housing; 11. an upper housing; 12. a lower housing; 2. a motor; 3. a mounting plate; 4. a transmission assembly; 41. a first fixing plate; 42. a gear set; 421. a main gear; 422. a pinion gear; 423. a gear ring; 43. a second fixing plate; 5. a driven gear; 50. positioning columns; 51. an execution shaft; 511. a thread; 52. a first sealed bearing; 53. a mounting base; 54. a transmission block; 55. a block; 551. a second sealed bearing; 56. a sleeve; 57. a closed space; 58. a pipe; 59. a detection seat; 591. and a detection head.

Detailed Description

The following embodiments of the present utility model are described in terms of specific examples, and those skilled in the art will appreciate the advantages and capabilities of the present utility model from the disclosure herein. It should be noted that, the illustrations provided in the following embodiments are for illustration only, and are shown in schematic drawings, not physical drawings, and are not to be construed as limiting the utility model, and in order to better illustrate the embodiments of the utility model, certain components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limiting the present utility model, and that the specific meanings of the terms described above may be understood by those of ordinary skill in the art in view of the specific circumstances, and that the terms such as "first", "second", etc. are merely used for distinguishing the description in the description of the present utility model and are not to be construed as indicating or implying relative importance.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

As shown in fig. 1-5, an embodiment of the present application provides a high-precision electric actuator, which includes a housing 1, a motor 2, a transmission mechanism, and an actuator. The motor 2 and the transmission mechanism are assembled in the shell 1, and an output shaft of the motor 2 is in transmission connection with the transmission mechanism and used for precisely transmitting the motion state of the motor 2. One end of the actuating mechanism is assembled in the shell 1 and is in transmission connection with the transmission mechanism, and the other end of the actuating mechanism rotates to penetrate out of the shell 1 and is used for precisely actuating the motion state of the motor 2, so that precise control of the valve is realized.

In the present embodiment, as shown in fig. 1-2, the housing 1 includes an upper housing 11 and a lower housing 12. The upper case 11 and the lower case 12 are detachably and fixedly connected by bolts. To enhance the sealability between the upper case 11 and the lower case 12, a sealing strip may be provided at the lower case 12. The end of the actuator passes out of the upper housing 11 for precise control of the valve.

In the present embodiment, the upper case 11 and the lower case 12 may be molded by plastic injection molding, or may be molded by integral die casting using an alloy material. The alloy material can be aluminum alloy material, magnesium aluminum alloy and the like.

In some embodiments, as shown in fig. 2, the transmission mechanism includes a mounting plate 3 and a transmission assembly 4. The mounting plate 3 is assembled in the housing 1, and the transmission assembly 4 is assembled on one side of the mounting plate 3 and is in transmission connection with the output shaft of the motor 2. The motor 2 is fixedly assembled in the lower shell 12 through bolts, and an output shaft of the motor 2 rotates to penetrate out of the mounting plate 3, so that the transmission assembly 4 can be driven to work when the motor 2 works.

In this embodiment, a controller is fixedly mounted on the mounting plate 3, and the controller is in signal connection with the motor 2 and is used for controlling the operation of the motor 2. In actual use, the controller may also be connected to the motor 2 via a data line. The controller can be a PLC controller, a microcomputer controller or a selection according to actual conditions.

In this embodiment, as shown in fig. 2-5, the drive assembly 4 includes a first stationary plate 41, a second stationary plate 43, and a gear set 42. The gear set 42 is fitted between the first and second fixing plates 41, 43, and the output shaft of the motor 2 is in driving connection with the gear set 42, on the one hand providing a mounting basis for the gear set 42 and, on the other hand, for the actuator.

In the present embodiment, as shown in fig. 5, the gear set 42 includes a main gear 421, a sub gear 422, and a ring gear 423. The main gear 421 is fixedly assembled on the output shaft of the motor 2 by a spline. The gear ring 423 is rotatably assembled between the first fixing plate 41 and the second fixing plate 43, the pinion 422 is engaged between the main gear 421 and the gear ring 423, the number of the pinion 422 is three, the three pinion 422 are equiangularly arranged between the main gear 421 and the inner side of the gear ring 423, and a planetary gear is formed so that the main gear 421 can drive the gear ring 423 to rotate through the pinion 422 when the main gear 421 rotates. The outer side of the gear ring 423 is provided with teeth, and the teeth on the inner side of the gear ring 423 have the same number of teeth with the outer side, so that the synchronous driving of the actuating mechanism can be kept when the gear ring 423 rotates.

In the present embodiment, the first fixing plate 41 and the second fixing plate 43 are fixed by bolts at the time of assembly, so that the ring gear 423 is stably mounted. The transmission mechanism and the actuating mechanism are stably installed by fixedly installing the mounting plate 3 and the second fixing plate 43 through bolts.

In some embodiments, as shown in fig. 2-5, the actuator includes a driven gear 5, an actuator shaft 51, and a feedback member. The driven gear 5 is rotatably fitted between the first fixing plate 41 and the second fixing plate 43 and is engaged with teeth on the outer side of the ring gear 423, so that the driven gear 5 can be rotated when the ring gear 423 is rotated. One end of the actuating shaft 51 is fixedly fitted to the middle of the driven gear 5 and passes through the second fixing plate 43 and the upper housing 11. The feedback member is fitted at the actuator shaft 51 and is in signal connection with the motor 2 and the controller for controlling the operation of the motor 2.

In the present embodiment, a first sealing bearing 52 is installed between the actuating shaft 51 and the second fixing plate 43, so that the actuating shaft 51 rotates more smoothly, and a seal is formed to prevent water/air in the valve from entering. The execution shaft 51 is sleeved with a mounting seat 53, and one end of the feedback piece is hermetically assembled on the mounting seat 53, so that on one hand, the installation of the execution block is facilitated; on the other hand, the sealability at the actuating shaft 51 is improved, and leakage of the liquid in the feedback member is avoided.

In this embodiment, the first fixing plate 41 is fixedly provided with a positioning post 50, and a groove is formed in the middle of the upper end of the driven gear 5, and one end of the positioning post 50 is located in the groove for positioning and assembling the driven gear 5.

In some embodiments, as shown in fig. 3-5, the feedback member includes a drive block 54, a sleeve 56, a blocking block 55, and a sensing member. The executing shaft 51 is provided with threads 511, the transmission block 54 is in threaded connection with the executing shaft 51, sliding blocks are symmetrically arranged on the transmission block 54, sliding grooves are symmetrically arranged on the inner wall of the sleeve 56, and the sliding blocks are positioned in the sliding grooves, so that when the executing shaft 51 rotates, the transmission block 54 can be lifted and lowered along the executing shaft 51. The blocking block 55 is sleeved on the smooth section of the actuating shaft 51, and forms a closed space 57 with the actuating block, and the closed space 57 is filled with liquid. The sleeve 56 is sleeved on the transmission block 54 and the plugging block 55, the bottom of the sleeve 56 is fixedly connected to the mounting seat 53, and the sleeve 56 and the plugging block 55 are stably assembled at the execution shaft 51. One end of the detecting member is communicated in the closed space 57, the other end of the detecting member is arranged in the shell 1 and is in signal connection with the motor 2, when the executing shaft 51 rotates, the driving block 54 can be driven to move along the threads 511, so that liquid in the closed space 57 is extruded, the liquid can be detected by the detecting member, and according to the detection condition, the rotation of the output shaft of the motor 2 is reversely controlled, so that the control of the motor 2 is more accurate.

In the present embodiment, the liquid may be water, engine oil, lubricating oil, or the like, and is preferably engine oil, and it is possible to perform not only a function of detecting a medium but also a function of lubricating the execution shaft 51.

In this embodiment, the sealing block 55 is equipped with a second sealing bearing 551 at one end of the enclosed space 57, so as to avoid leakage of the liquid in the enclosed space 57; on the other hand, water/gas entry in the valve is also avoided, thereby improving the accuracy of liquid movement in the enclosed space 57 and making detection more accurate.

In this embodiment, as shown in fig. 4-5, the sensing element includes a conduit 58, a sensing head 591, and a sensing seat 59. One end of the pipe 58 penetrates out of the blocking block 55 to be communicated with the closed space 57, and the other end is assembled in the shell 1. The detecting seat 59 is fixedly assembled in the upper housing 11 by bolts, and the detecting head 591 is assembled on the detecting seat 59 and corresponds to the pipe 58 for detecting the liquid position in the pipe 58, so as to feed back to the controller according to the detection condition, thereby controlling the operation of the motor 2.

In this embodiment, the detection head 591 may be a photodetector, a grating, or the like, or may be a camera, or the like, and the position of the liquid in the pipe 58 is detected by the detection head 591, so that the rotation angle of the execution shaft 51 is fed back, the rotation condition of the output shaft of the motor 2 is fed back, the accurate control of the output shaft of the motor 2 is realized, and the high-precision control of the actuator is further realized.

In this embodiment, the pipe 58 may be a straight pipe, or may be a vortex pipe, the detecting head 591 is opposite to the straight pipe and the vortex pipe, and both the pipe 58 and the detecting head 591 are located on the inner wall of the upper housing 11, so that water/gas in the valve can be prevented from invading the detecting head 591 along the actuating shaft 51 to a certain extent, thereby being beneficial to prolonging the service life of the detecting head 591, and being convenient to assemble, and reducing the requirements for waterproofness and tightness. The scale is arranged outside the pipe body, so that the detection is more convenient.

In this embodiment, the inner diameter of the conduit 58 is 0.1-0.3mm, allowing the liquid to move rapidly along the conduit 58 as the actuator shaft 51 rotates, thus providing more accurate feedback. And because the pipeline 58 is assembled on the plugging block 55, part of the pipeline faces upwards, liquid cannot naturally flow under the action of gravity, and false detection is caused.

In this embodiment, when the opening and closing degree of the valve needs to be controlled, the output shaft of the motor 2 rotates to drive the main gear 421 to rotate, the main gear 421 rotates to drive the auxiliary gear 422 to rotate, and the auxiliary gear 422 rotates to drive the gear ring 423 to rotate, so that the first precision control is formed; the ring gear 423 rotates to drive the driven gear 5 to rotate, the driven gear 5 rotates to drive the execution shaft 51 to rotate, and in the process of rotating the execution shaft 51, the transmission block 54 is driven to lift along the execution shaft 51, so that liquid in the closed space 57 is extruded, the liquid enters the pipeline 58 and is detected by the detection head 591, the detection head 591 feeds back to the controller according to the detected liquid level, the controller compares and judges with a preset program according to the received data condition, and then the work of the motor 2 is controlled, so that the precise control of the motor 2 is realized, and the high-precision control of the electric actuator is realized.

The high-precision electric actuator provided by the utility model is described in detail above. The description of the specific embodiments is only intended to aid in understanding the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

It should be noted that references in the specification to "one embodiment," "an embodiment," "some alternative embodiments," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model. The technology, shape, and construction parts of the present utility model, which are not described in detail, are known in the art.

Claims (10)

1. High accuracy electric actuator, its characterized in that: the device comprises a shell (1), a motor (2), a transmission mechanism and an executing mechanism, wherein the motor (2) and the transmission mechanism are assembled in the shell (1), an output shaft of the motor (2) is in transmission connection with the transmission mechanism and used for precisely transmitting the motion state of the motor (2), one end of the executing mechanism is assembled in the shell (1) and in transmission connection with the transmission mechanism, and the other end of the executing mechanism rotates to penetrate out of the shell (1) and is used for precisely executing the motion state of the motor (2);

The actuating mechanism comprises a driven gear (5), an actuating shaft (51) and a feedback piece, wherein the driven gear (5) is rotationally assembled in the transmission mechanism and is in transmission connection with the transmission mechanism, one end of the actuating shaft (51) is fixedly assembled on the driven gear (5), and the feedback piece is assembled at the actuating shaft (51) and is in signal connection with the motor (2).

2. The high precision electric actuator of claim 1, wherein: the transmission mechanism comprises a mounting plate (3) and a transmission assembly (4), wherein the mounting plate (3) is assembled in the shell (1), and the transmission assembly (4) is assembled on one side of the mounting plate (3) and is in transmission connection with an output shaft of the motor (2).

3. The high precision electric actuator of claim 2, wherein: the transmission assembly (4) comprises a first fixed plate (41), a second fixed plate (43) and a gear set (42), wherein the gear set (42) is assembled between the first fixed plate (41) and the second fixed plate (43), and an output shaft of the motor (2) is in transmission connection with the gear set (42).

4. A high precision electric actuator as defined in claim 3, wherein: the gear set (42) comprises a main gear (421), a pinion (422) and a gear ring (423), wherein the main gear (421) is fixedly assembled on an output shaft of the motor (2), the gear ring (423) is rotatably assembled between the first fixed plate (41) and the second fixed plate (43), and the pinion (422) is meshed between the main gear (421) and the gear ring (423).

5. The high precision electric actuator of claim 1, wherein: the actuating shaft (51) is sleeved with a mounting seat (53), and one end of the feedback piece is hermetically assembled on the mounting seat (53).

6. The high precision electric actuator of claim 1, wherein: the feedback piece comprises a transmission block (54), a sleeve (56), a blocking block (55) and a detection piece, wherein threads (511) are formed on the execution shaft (51), the transmission block (54) is connected onto the execution shaft (51) in a screwed mode, the blocking block (55) is sleeved on the execution shaft (51) and forms a closed space (57) with the execution block, liquid is filled in the closed space (57), the sleeve (56) is sleeved on the transmission block (54) and the blocking block (55), the sleeve (56) is fixedly connected onto the transmission mechanism, one end of the detection piece is communicated into the closed space (57), and the other end of the detection piece is arranged in the shell (1) and is in signal connection with the motor (2).

7. The high precision electric actuator of claim 6, wherein: sliding blocks are symmetrically arranged on the transmission blocks (54), sliding grooves are symmetrically arranged on the inner wall of the sleeve (56), and the sliding blocks are located in the sliding grooves.

8. The high precision electric actuator of claim 6, wherein: the detection piece comprises a pipeline (58), a detection head (591) and a detection seat (59), one end of the pipeline (58) is communicated in the closed space (57), the other end of the pipeline is assembled in the shell (1), the detection seat (59) is fixedly assembled in the shell (1), and the detection head (591) is assembled on the detection seat (59) and used for detecting the position of liquid in the pipeline (58).

9. The high precision electric actuator of claim 8, wherein: the pipeline (58) is provided with graduation marks.

10. The high precision electric actuator of claim 1, wherein: the shell (1) comprises an upper shell (11) and a lower shell (12), the upper shell (11) and the lower shell (12) are detachably and fixedly connected, and the tail end of the execution shaft (51) penetrates out of the upper shell (11).