CN217633717U

CN217633717U - External insertion type electric linear actuator

Info

Publication number: CN217633717U
Application number: CN202220304500.4U
Authority: CN
Inventors: 郑森辉; 林鹏; 王炳鑫
Original assignee: Xiamen Insvac Intelligent Equipment Co ltd
Current assignee: Xiamen Insvac Intelligent Equipment Co ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-10-21
Anticipated expiration: 2032-02-15

Abstract

The utility model relates to an external inserting electric linear actuator which is inserted in a vacuum box body provided with an installation jack, and a driving mechanism is in transmission connection with a transmission mechanism; the driving mechanism, the transmission mechanism and the sealing connecting seat are positioned outside the box body; the sealing connecting seat is fixedly arranged on the outer side surface of the box body in a sealing way; one end of the cylinder body is fixedly connected with the sealing connecting seat in a sealing way, and the other end of the cylinder body is positioned in the box body; the front end cover is fixedly arranged at the other end of the cylinder body in a sealing way; the lead screw is in transmission connection with the transmission mechanism; the screw rod penetrates through the cylinder body; the piston in the rod is fixedly arranged at the tail end of the screw rod; the screw nut is fixedly sleeved on the screw; the cylinder piston is fixedly sleeved on the screw nut; the hollow piston rod movably penetrates through the front end cover and is sleeved outside the screw rod, the hollow piston rod is movably and hermetically connected with the front end cover, and the hollow piston rod is fixedly connected with the cylinder piston. The environment in this application cylinder body is sealed with the environment in the box and is kept apart, has avoided the influence that the mechanism spare part in the cylinder body received the box internal environment.

Description

External insertion type electric linear actuator

Technical Field

The utility model relates to a straight line actuating mechanism, in particular to electronic straight line executor of extrapolation formula.

Background

In the field of process industrial equipment, a mechanism is often required to perform linear reciprocating motion in a closed box body or a tank body, because the working environment in the closed box body or the tank body is often greatly different from the environment under the external atmospheric pressure, such as vacuum, pressure, viscous medium volatile matters and the like, the linear actuating mechanism is often poor in execution precision and short in service life in the complex environment in the box body or the tank body.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide an external-insertion electric linear actuator that solves one or more of the problems associated with the prior linear actuators described above.

In order to achieve the purpose, the inventor provides an external insertion type electric linear actuator which is inserted in a vacuum box body provided with an installation jack and comprises a driving mechanism, a transmission mechanism, a sealing connecting seat, a cylinder body, a lead screw nut, a lead screw, a cylinder body piston, a hollow piston rod, a front end cover and an in-rod piston; the driving mechanism is in transmission connection with the transmission mechanism; the driving mechanism and the transmission mechanism are fixedly connected with the sealing connecting seat; the driving mechanism, the transmission mechanism and the sealing connecting seat are positioned outside the box body; the sealing connecting seat is fixedly arranged on the outer side surface of the box body in a sealing manner, and the mounting insertion hole is surrounded by a sealing surface between the sealing connecting seat and the box body; one end of the cylinder body is fixedly connected with the sealing connecting seat in a sealing way; the cylinder body penetrates through the installation jack, and the other end of the cylinder body is positioned in the box body; the front end cover is fixedly arranged at the other end of the cylinder body in a sealing way; one end of the lead screw is connected with the transmission mechanism; the lead screw penetrates through the cylinder body; the piston in the rod is fixedly arranged at the other end of the screw rod; the screw rod nut is fixedly sleeved on the screw rod; the cylinder piston is fixedly sleeved on the lead screw nut; the hollow piston rod movably penetrates through the front end cover and is sleeved outside the lead screw, the hollow piston rod is movably and hermetically connected with the front end cover, and one open end of the hollow piston rod is fixedly connected with the cylinder piston; when the hydraulic cylinder works, the driving mechanism drives the lead screw to rotate through the transmission mechanism, and the lead screw nut drives the cylinder piston and the hollow piston rod to do linear motion under the driving of the lead screw.

Be different from prior art, the environment in the technical scheme cylinder body of this application realizes sealed the isolation with the environment in the box, has avoided the influence that the mechanism spare part in the cylinder body received the box internal environment effectively.

Preferably, the driving mechanism is a driving motor and a motor base, and the transmission mechanism comprises a coupling, a round nut, a bearing seat and a thrust bearing; the bearing seat is further configured as the sealed connection seat; the driving motor is fixedly arranged on the motor base; the motor base is fixedly arranged on the bearing block; the bearing block is fixedly arranged on the outer side surface of the box body in a sealing manner, the mounting insertion hole is surrounded by a sealing surface between the bearing block and the box body, and one end of the cylinder body is fixedly connected with the bearing block in a sealing manner; the thrust bearing is embedded in an installation groove formed by combining the motor base and the bearing seat; the shaft coupling is inserted into an inner hole of the thrust bearing, and a shaft shoulder surface of the shaft coupling is tightly attached to an inner end surface of an inner ring of the thrust bearing; the round nut is tightly attached to the outer end face of the thrust bearing inner ring to firmly lock the coupling and the thrust bearing inner ring; the driving motor is in transmission connection with the coupling to drive the coupling to rotate; the shaft head of the screw rod is tightly connected with the coupling in an inserting way, and the screw rod rotates along with the rotation of the coupling; when the screw rod driving device works, the driving motor drives the screw rod to rotate through the coupling.

Preferably, a slide rail is fixedly arranged on the inner surface of the cylinder body, a slide block is fixedly arranged on the piston of the cylinder body, the slide block is provided with a slide groove, the slide rail is embedded into the slide groove, and the slide block can slide along the slide rail.

Preferably, the slide rail is in a strip shape, a plurality of slide rail fixing screws penetrate through small through holes in the cylinder body to lock and fix the slide rail on the inner surface of the cylinder body, and a fixing screw sealing ring is arranged between the shaft shoulder surface of the head part of each slide rail fixing screw and the cylinder body to form sealing; the slider is the rectangular piece that the cross section is "concave" font, the slide rail imbeds in the recess of slider.

Preferably, the inner side wall of the front end cover is provided with three grooves, and the three grooves are respectively provided with a piston rod guide sleeve, a piston rod dynamic seal and a piston rod scraping ring.

Preferably, the outer side wall of the cylinder piston is provided with two grooves, and two cylinder piston guide rings are embedded in the two grooves; the outer side wall of the piston in the rod is provided with a groove for embedding a guide ring of the piston in the rod, and the guide ring of the piston in the rod is arranged in the groove.

Preferably, an end cover plane sealing ring and an end cover radial sealing ring are arranged on the mounting sealing surface between the cylinder body and the bearing seat and the mounting sealing surface between the front end cover and the cylinder body to form sealing; and a sealing surface between the bearing seat and the box body is provided with a bearing seat sealing ring to form sealing.

Preferably, the driving motor, the motor base, the shaft coupling, the bearing seat, the thrust bearing, the cylinder body, the screw nut, the screw, the cylinder body piston, the hollow piston rod, the front end cover and the rod inner piston are all coaxially arranged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a linear actuator according to the present application;

FIG. 2 is a schematic cross-sectional view taken along line B-B of FIG. 1;

description of reference numerals:

1. the driving motor, 2, a motor base, 3, a coupling, 4, a round nut, 5, a bearing seat, 6, a thrust bearing, 7, a bearing seat sealing ring, 8, an end cover plane sealing ring, 9, an end cover radial sealing ring, 10, a cylinder body, 11, a sliding rail, 12, a sliding rail fixing screw, 13, a fixing screw sealing ring, 14, a screw nut, 15, a screw rod, 16, a cylinder piston, 17, a sliding block, 18, a hollow piston rod, 19, a front end cover, 20, a piston rod guide sleeve, 21, a piston rod dynamic seal, 22, a piston rod scraping ring, 23, a cylinder piston guide ring, 24, an in-rod piston, 25 and an in-rod piston guide ring.

Detailed Description

In order to explain technical contents, structural features, objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in combination with the embodiments.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.

In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present application are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The utility model provides an electronic sharp executor of extrapolation, cartridge in the vacuum box that is provided with the installation jack, please refer to fig. 1 to fig. 2:

an external insertion type electric linear actuator comprises a driving mechanism, a transmission mechanism, a sealing connecting seat, a cylinder body 10, a lead screw nut 14, a lead screw 15, a cylinder body piston 16, a hollow piston rod 18, a front end cover 19 and an in-rod piston 24; the driving mechanism is in transmission connection with the transmission mechanism; the driving mechanism is fixedly connected with the sealing connecting seat, and the transmission mechanism is fixedly connected with the sealing connecting seat; the driving mechanism, the transmission mechanism and the sealing connecting seat are positioned on the outer side of the box body; the sealing connecting seat is fixedly arranged on the outer side surface of the box body in a sealing way, and the mounting insertion hole is surrounded by a sealing surface between the sealing connecting seat and the box body; one end of the cylinder body 10 is fixedly connected with the sealing connecting seat in a sealing way; the cylinder body 10 penetrates through the installation jack, and the other end of the cylinder body 10 is positioned in the box body; the front end cover 19 is fixedly arranged at the other end of the cylinder body 10 in a sealing way, and the front end cover 19 and the cylinder body 10 are coaxially arranged; one end of the screw rod 15 is connected with the transmission mechanism; the lead screw 15 is arranged in the cylinder body 10 in a penetrating way; the piston 24 in the rod is fixedly arranged at the other end of the screw rod 15; the screw nut 14 is fixedly sleeved on the screw 15, and the screw nut 14 and the screw 15 are coaxially arranged; the cylinder piston 16 is fixedly sleeved on the lead screw nut 14; the hollow piston rod 18 movably penetrates through the front end cover 19 and is sleeved outside the screw rod 15, the hollow piston rod 18 is movably and hermetically connected with the front end cover 19, one open end of the hollow piston rod 18 is fixedly connected with the cylinder piston 16, and the hollow piston rod 18 and the cylinder piston 16 are coaxially arranged; when the hydraulic cylinder works, the driving mechanism drives the screw rod 15 to rotate through the transmission mechanism, and the screw rod nut 14 drives the cylinder piston 16 and the hollow piston rod 18 to do linear motion under the driving of the screw rod 15.

Specifically, the driving mechanism of the embodiment includes a driving motor 1 and a motor base 2, and the transmission mechanism includes a coupling 3, a round nut 4, a bearing seat 5 and a thrust bearing 6; the bearing housing 5 is also configured as a sealing connection seat; namely, the bearing seat 5 is used as a bearing mounting seat and a sealing connecting seat; the driving motor 1 is fixedly arranged on the motor base 2, and the driving motor 1 and the motor base 2 are coaxially arranged; the motor base 2 is fixedly arranged on the bearing block 5, and the motor base 2 and the bearing block 5 are coaxially arranged; the bearing seat 5 is fixedly arranged on the outer side surface of the box body in a sealing manner, a sealing surface between the bearing seat 5 and the box body surrounds the mounting insertion hole, one end of the cylinder body 10 penetrates through the mounting insertion hole to be fixedly connected with the bearing seat 5 in a sealing manner, and the cylinder body 10 and the bearing seat 5 are coaxially arranged; the thrust bearing 6 is coaxially embedded in an installation groove formed by combining the motor base 2 and the bearing seat 5; the shaft coupling 3 is coaxially inserted into an inner hole of the thrust bearing 6, and a shaft shoulder surface of the shaft coupling 3 is tightly attached to an inner end surface of an inner ring of the thrust bearing 6; the round nut 4 is tightly attached to the outer end face of the inner ring of the thrust bearing 6 to firmly lock the coupling 3 and the inner ring of the thrust bearing 6; the driving motor 1 is in transmission connection with the coupling 3 to drive the coupling 3 to rotate; the shaft head of the screw rod 15 is tightly connected with the coupling 3 in a plug-in manner and rotates along with the rotation of the coupling 3; in operation, the driving motor 1 drives the screw 15 to rotate through the coupling 3.

Specifically, a slide rail 11 is fixedly disposed on the inner surface of the cylinder 10, a slide block 17 is fixedly disposed on the cylinder piston 16, the slide block 17 has a slide groove, the slide rail 11 is embedded in the slide groove, and the slide block 17 can slide along the slide rail 11.

Specifically, in the present embodiment, a plurality of slide rail fixing screws 12 pass through small through holes on the cylinder body 10 to lock and fix the elongated slide rail 11 on the inner surface of the cylinder body 12, and a fixing screw sealing ring 13 is arranged between a shaft shoulder surface of the head of each slide rail fixing screw 12 and the cylinder body 10 to form a seal; the sliding block 17 is a long strip block with a concave cross section, and the sliding rail 11 is embedded into a groove of the sliding block 17.

Specifically, the inner side wall of the front end cover 19 of this embodiment is provided with three grooves, and the three grooves are respectively provided with a piston rod guide sleeve 20, a piston rod dynamic seal 21 and a piston rod scraping ring 22. When the hollow piston rod moves linearly and telescopically, the piston rod scraping ring 22 can effectively scrape viscous medium volatile matters on the rod, and the service life of the piston rod dynamic seal 21 is prolonged.

Specifically, the outer side wall of the cylinder piston 16 of the embodiment is provided with two grooves, and two cylinder piston guide rings 23 are embedded in the two grooves; the outer side wall of the piston 24 in the rod is provided with a groove for embedding a piston guide ring 25 in the rod, and the piston guide ring 25 in the rod is arranged in the groove. The piston rod guide sleeve 20, the cylinder body piston guide ring 23 and the in-rod piston guide ring 25 are all made of elastic and tough high polymer materials. The piston rod guide sleeve 20, the cylinder body piston guide ring 23 and the in-rod piston guide ring 25 are used for coaxial group positive guide of all motion related parts of the mechanism, stable and accurate operation of the mechanism is guaranteed, the service life of the piston rod dynamic seal 21 is prolonged, and errors of all motion related parts during manufacturing and assembling are compensated and eliminated.

Specifically, the mounting sealing surface between the cylinder 10 and the bearing seat 5 and the mounting sealing surface between the front end cover 19 and the cylinder 10 of the present embodiment are both provided with an end cover planar sealing ring 8 and an end cover radial sealing ring 9 to form sealing; and a sealing surface between the bearing seat 5 and the box body is provided with a bearing seat sealing ring 7 to form sealing.

When the linear motion mechanism works, the output shaft of the driving motor 1 rotates, the screw rod 15 is driven to rotate through the coupling 3, the screw rod nut 14 is driven by the screw rod 15 to conduct linear motion under the guide of the sliding block 17 and the sliding rail 11, and further the cylinder piston 16 and the hollow piston rod 18 which are fixedly connected with the cylinder piston are driven to conduct linear motion. The output shaft of the driving motor 1 rotates reversely, and then the hollow piston rod 18 is driven to move linearly reversely.

The utility model discloses a piston rod dynamic seal, end cover plane sealing washer and the end cover radial seal circle that set up for the environment of cylinder body and the environment realization of incasement are kept apart, have avoided the mechanism spare part in the cylinder body to receive the influence of jar interior (incasement) environment effectively, and it is high-efficient to save time more. And all the parts related to movement are arranged in the cylinder body, so that the whole structure is compact, and the occupied space is small.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.

Claims

1. An external insertion type electric linear actuator is inserted in a vacuum box body provided with an installation jack and is characterized by comprising a driving mechanism, a transmission mechanism, a sealing connecting seat, a cylinder body (10), a lead screw nut (14), a lead screw (15), a cylinder body piston (16), a hollow piston rod (18), a front end cover (19) and an in-rod piston (24); the driving mechanism is in transmission connection with the transmission mechanism; the driving mechanism and the transmission mechanism are fixedly connected with the sealing connecting seat; the driving mechanism, the transmission mechanism and the sealing connecting seat are positioned outside the box body; the sealing connecting seat is fixedly arranged on the outer side surface of the box body in a sealing manner, and the mounting insertion hole is surrounded by a sealing surface between the sealing connecting seat and the box body; one end of the cylinder body (10) is fixedly connected with the sealing connecting seat in a sealing way; the cylinder body (10) penetrates through the mounting jack, and the other end of the cylinder body (10) is positioned in the box body; the front end cover (19) is fixedly arranged at the other end of the cylinder body (10) in a sealing way; one end of the lead screw (15) is connected with the transmission mechanism; the lead screw (15) is arranged in the cylinder body (10) in a penetrating way; the piston (24) in the rod is fixedly arranged at the other end of the screw rod (15); the screw nut (14) is fixedly sleeved on the screw (15); the cylinder piston (16) is fixedly sleeved on the lead screw nut (14); the hollow piston rod (18) movably penetrates through the front end cover (19) and is sleeved outside the screw rod (15), the hollow piston rod (18) is movably and hermetically connected with the front end cover (19), and one open end of the hollow piston rod (18) is fixedly connected with the cylinder piston (16); when the hydraulic cylinder works, the driving mechanism drives the lead screw (15) to rotate through the transmission mechanism, and the lead screw nut (14) drives the cylinder piston (16) and the hollow piston rod (18) to do linear motion under the driving of the lead screw (15).

2. The external electric linear actuator according to claim 1, wherein the driving mechanism comprises a driving motor (1) and a motor base (2), and the transmission mechanism comprises a coupling (3), a round nut (4), a bearing seat (5) and a thrust bearing (6); the bearing seat (5) is also configured as the sealing connection seat; the driving motor (1) is fixedly arranged on the motor base (2); the motor base (2) is fixedly arranged on the bearing seat (5); the bearing block (5) is fixedly arranged on the outer side surface of the box body in a sealing manner, a sealing surface between the bearing block (5) and the box body surrounds the mounting insertion hole, and one end of the cylinder body (10) is fixedly connected with the bearing block (5) in a sealing manner; the thrust bearing (6) is embedded in a mounting groove formed by combining the motor base (2) and the bearing seat (5); the shaft coupling (3) is inserted into an inner hole of the thrust bearing (6), and a shaft shoulder surface of the shaft coupling (3) is tightly attached to an inner end surface of an inner ring of the thrust bearing (6); the round nut (4) is tightly attached to the outer end face of the inner ring of the thrust bearing (6) to firmly lock the coupling (3) and the inner ring of the thrust bearing (6); the driving motor (1) is in transmission connection with the coupling (3) to drive the coupling (3) to rotate; the shaft head of the screw rod (15) is tightly inserted and connected with the coupling (3), and the screw rod (15) rotates along with the rotation of the coupling (3); when the device works, the driving motor (1) drives the lead screw (15) to rotate through the coupling (3).

3. An external plug-in electric linear actuator according to claim 1, characterized in that a slide rail (11) is fixedly arranged on the inner surface of the cylinder (10), a slide block (17) is fixedly arranged on the cylinder piston (16), the slide block (17) is provided with a slide slot, the slide rail (11) is embedded in the slide slot, and the slide block (17) can slide along the slide rail (11).

4. The external-plug electric linear actuator according to claim 3, wherein the slide rail (11) is a long strip, a plurality of slide rail fixing screws (12) pass through small through holes on the cylinder body (10) to tightly lock and fix the slide rail (11) on the inner surface of the cylinder body (10), and a fixing screw sealing ring (13) is arranged between a shaft shoulder surface of the head of each slide rail fixing screw (12) and the cylinder body (10) to form a seal; the sliding block (17) is a long strip block with a concave-shaped cross section, and the sliding rail (11) is embedded into a groove of the sliding block (17).

5. The external-plug electric linear actuator according to claim 1, wherein the front end cover (19) is provided with three grooves on its inner side wall, and the three grooves are respectively provided with a piston rod guide sleeve (20), a piston rod dynamic seal (21) and a piston rod scraping ring (22).

6. An external plug-in electric linear actuator according to claim 1, characterized in that the outer side wall of the cylinder piston (16) is provided with two grooves, and the two grooves are embedded with two cylinder piston guide rings (23); the outer side wall of the piston (24) in the rod is provided with a groove for embedding a piston guide ring (25) in the rod, and the piston guide ring (25) in the rod is arranged in the groove.

7. An external plug-in electric linear actuator according to claim 2, characterized in that the mounting sealing surface between the cylinder (10) and the bearing seat (5) and the mounting sealing surface between the front end cover (19) and the cylinder (10) are provided with an end cover plane sealing ring (8) and an end cover radial sealing ring (9) to form a seal; and a sealing surface between the bearing seat (5) and the box body is provided with a bearing seat sealing ring (7) to form sealing.

8. The external plug-in electric linear actuator according to claim 2, wherein the driving motor (1), the motor base (2), the coupling (3), the bearing seat (5), the thrust bearing (6), the cylinder body (10), the lead screw nut (14), the lead screw (15), the cylinder piston (16), the hollow piston rod (18), the front end cover (19) and the rod inner piston (24) are coaxially arranged.