Flexible control variable-frequency electric actuator

Abstract

The utility model discloses a flexible control frequency conversion electric actuator, and belongs to the technical field of electric actuators. A flexible control assembly is fixedly installed on the bottom face of an electric actuator through screws, an output shaft of the electric actuator is in transmission connection with a rotating shaft assembly in the flexible control assembly, fixing grooves are formed in the two sides of the interior of a shell correspondingly, and first-stage buffering mechanisms are inserted into the fixing grooves correspondingly; the end of the first-stage buffering mechanism is slidably connected with the side wall of the oval plate, the second-stage buffering mechanism is arranged at the bottom of the rotating shaft assembly, through the first-stage buffering mechanism and the second-stage buffering mechanism, impact force is effectively buffered in the starting and stopping process of the electric actuator, the problems of tooth surface abrasion, lead screw deformation and the like are avoided, and in the industrial production scene of frequent starting and stopping, the service life of the electric actuator is prolonged. Transmission parts such as the gear and the lead screw can work in a relatively stable stress environment, so that the service life of key mechanical parts is greatly prolonged, and the maintenance and replacement cost of equipment is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric actuators, in particular to a flexible control variable-frequency electric actuator. BACKGROUND

[0002] The variable-frequency electric actuator is an important device applied to industrial automation and control systems, and is mainly used for adjusting movement and force in a mechanical system. The variable-frequency electric actuator is generally composed of a motor, a frequency converter and an actuator. The frequency converter can adjust the rotating speed of the motor by changing the input frequency of the motor, so as to control the movement of the actuator.

[0003] However, during the starting and stopping processes of the electric actuator, the sudden stop without flexible control will generate a large impact force on the mechanical parts of the actuator, such as gear, screw rod and other transmission parts. Frequent sudden stop may cause problems such as gear surface wear and screw rod deformation. During the process of adjusting the valve opening, if there is no flexible control, the electric actuator may overshoot due to rapid action, so that the valve opening exceeds the set value, which leads to inaccurate control and also reduces the service life and causes damage to the electric actuator.

[0004] Therefore, it is necessary to provide a flexible control variable-frequency electric actuator to solve the above problems.

[0005] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, it can contain information which does not constitute prior art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a flexible control variable-frequency electric actuator to solve the problems raised in the above background.

[0007] The technical scheme adopted by the application to solve the technical problems is:

[0008] A flexible control variable-frequency electric actuator, the bottom surface of the electric actuator is fixedly installed with a flexible control assembly through screws, the output shaft of the electric actuator is in transmission connection with a rotating shaft assembly inside the flexible control assembly, the flexible control assembly comprises a shell, a shaft hole, a buffer mechanism and a fixed disc, the two sides of the shell are fixedly installed on the bottom surface of the electric actuator through screws, the bottom surface of the shell is integrally formed with the fixed disc, the top surface of the shell is provided with a shaft hole, the rotating shaft assembly is rotatably connected in the shaft hole, the rotating shaft assembly comprises an input shaft, a rotating shaft body and an elliptical plate, the input shaft is integrally formed with the top surface of the rotating shaft body, the side wall of the rotating shaft body is integrally formed with the elliptical plate, and the elliptical plate is rotatably connected in a rotating groove formed in the shell and taking the rotating shaft body as the center;

[0009] The inside of the shell is provided with a fixed groove on both sides, a first buffer mechanism is respectively inserted and installed in the fixed groove, the end of the first buffer mechanism is slidably connected with the side wall of the elliptical plate, and the elastic element in the first buffer mechanism is slidably connected in the buffer mechanism.

[0010] The bottom of the rotating shaft assembly is provided with a second buffer mechanism, and the second buffer mechanism is rotatably connected in the rotating groove formed in the inside of the fixed disc.

[0011] Preferably, the elastic element comprises a sleeve, a piston rod, a limiting disc, a spring and a pulley, the sleeve is inserted into the fixed groove in the inside of the shell, the inside of the sleeve is slidably connected with the piston rod, the end of the piston rod is fixedly connected with the limiting disc, the limiting disc is slidably connected in the inside of the sleeve, the spring is sleeved on the side wall of the piston rod between the limiting disc and the sleeve, the end of the piston rod is provided with a groove, the pulley is rotatably connected in the groove through a shaft, and the pulley is slidably connected on the side wall of the elliptical disc.

[0012] Preferably, the tail of the sleeve is provided with a hydraulic cylinder, the hydraulic cylinder is inserted into the fixed groove in the inside of the shell, the tail of the piston rod is provided with a piston, and the piston rod is slidably connected in the inside of the hydraulic cylinder; the side wall of the hydraulic cylinder is fixedly connected with a mounting disc, and the mounting disc is fixedly mounted on the side wall of the shell through screws.

[0013] Preferably, the second buffer mechanism comprises an upper jaw, an elastic body, a lower jaw and a driving shaft, the top surface of the upper jaw is integrally formed with the bottom surface of the rotating shaft body, the upper jaw and the lower jaw are inserted into each other, the elastic body is clamped between the upper jaw and the lower jaw, and the bottom surface of the lower jaw is integrally formed with the driving shaft for driving the valve.

[0014] Preferably, the elastic element is in the shape of a plum blossom.

[0015] Preferably, the inside of the fixed disc is provided with a mounting groove, a bearing is mounted in the mounting groove, and the side walls of the upper jaw and the lower jaw are inserted into the inner ring of the bearing.

[0016] The beneficial effects of the present application are:

[0017] Through the first buffer mechanism and the second buffer mechanism, the impact force is effectively buffered during the starting and stopping of the electric actuator, the problems such as tooth surface wear and screw deformation are avoided, in the industrial production scene of frequent start and stop, the transmission components such as gears and screws can work in a relatively stable stress environment, the service life of these key mechanical components is greatly prolonged, and the maintenance and replacement cost of the equipment is reduced.

[0018] When adjusting the opening degree of the valve, flexible control can prevent the actuator from overshooting due to rapid action, and ensure that the opening degree of the valve accurately reaches the set value.

[0019] In addition to the objects, features and advantages described above, this application has other objects, features and advantages. These and other objects, features and advantages of the present application will become apparent with reference to the drawings, in which: BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The embodiments of the application illustrated in the drawings serve to explain the application and do not constitute any limitation of the same.

[0021] In the drawings:

[0022] Figure 1 It is an overall schematic diagram of the flexible control variable frequency electric actuator of the utility model;

[0023] Figure 2 It is a flexible control assembly structure schematic diagram of the utility model;

[0024] Figure 3 It is a flexible control assembly internal structure schematic diagram of the utility model;

[0025] Figure 4 It is a first class buffer mechanism structure schematic diagram of the utility model;

[0026] Figure 5 It is a rotating shaft assembly structure schematic diagram of the utility model;

[0027] Figure 6 It is a rotating shaft assembly and first class buffer mechanism overhead structure schematic diagram of the utility model.

[0028] In the drawings, various reference signs:

[0029] 1, electric actuator;

[0030] 2, flexible control assembly;

[0031] 21, shell;

[0032] 22, shaft hole;

[0033] 23, rotating groove;

[0034] 24, first class buffer mechanism; 241, sleeve; 242, mounting disc; 243, hydraulic cylinder; 244, piston rod; 245, limit disc; 246, spring; 247, pulley;

[0035] 25, mounting groove;

[0036] 26, bearing;

[0037] 3, fixed disc;

[0038] 4. Rotary shaft assembly; 41. Input shaft; 42. Rotary shaft body; 43. Elliptical plate; 44. Upper protruding claw; 45. Elastomer; 46. Lower protruding claw; 47. Drive shaft. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0041] Please see Figures 1-6 The embodiments provided by this utility model are as follows:

[0042] A flexible control variable frequency electric actuator is disclosed. A flexible control component 2 is fixedly mounted on the bottom surface of the electric actuator 1 by screws. The output shaft of the electric actuator 1 is connected to the rotating shaft assembly 4 inside the flexible control component 2. The flexible control component 2 is fixedly mounted on the bottom surface of the electric actuator 1 by screws to ensure that the two are tightly connected. This allows the output shaft of the electric actuator 1 to be stably connected to the rotating shaft assembly 4 inside the flexible control component 2, thereby transmitting the power of the electric actuator 1 to the rotating shaft assembly 4 and providing a power basis for subsequent flexible control actions.

[0043] The flexible control component 2 includes a housing 21, a shaft hole 22, a buffer mechanism, and a fixed plate 3. The two sides of the housing 21 are fixedly installed on the bottom surface of the electric actuator 1 by screws. The bottom surface of the housing 21 is integrally formed with the fixed plate 3. The two sides of the housing 21 are fixed to the bottom surface of the electric actuator 1, and the bottom surface is integrally formed with the fixed plate 3, forming a closed and stable structural space. The top surface of the housing 21 has a shaft hole 22, and the rotating shaft assembly 4 is rotatably connected in the shaft hole 22. The shaft hole 22 provides rotational support for the rotating shaft assembly 4. When the rotating shaft assembly 4 rotates, it rotates smoothly in the shaft hole 22, reducing the additional resistance and instability caused by shaking. The rotating shaft assembly 4 includes an input shaft 41, a rotating shaft body 42, and an elliptical plate 43. The input shaft 41 is integrally formed with the top surface of the rotating shaft body 42. The side wall of the rotating shaft body 42 is integrally formed with the elliptical plate 43. The elliptical plate 43 is rotatably connected in a rotating groove 23 opened inside the housing 21 with the rotating shaft body 42 as the center.

[0044] The inside of the shell 21 is provided with a fixing groove on each side, and a first buffer mechanism 24 is respectively inserted and installed in the fixing groove. The end of the first buffer mechanism 24 is slidably connected with the side wall of the elliptical plate 43, and the internal elastic member of the first buffer mechanism 24 is slidably connected in the buffer mechanism.

[0045] Specifically, the elastic member includes a sleeve 241, a piston rod 244, a limiting disc 245, a spring 246 and a pulley 247. The sleeve 241 is inserted in the fixing groove in the inside of the shell 21. The piston rod 244 is slidably connected in the inside of the sleeve 241. The end of the piston rod 244 is fixedly connected with the limiting disc 245. The limiting disc 245 is slidably connected in the inside of the sleeve 241. The spring 246 is sleeved on the side wall of the piston rod 244 between the limiting disc 245 and the sleeve 241. The end of the piston rod 244 is provided with a groove. The pulley 247 is rotatably connected in the groove through a shaft. The pulley 247 is slidably connected on the side wall of the elliptical plate. When the electric actuator 1 stops or the action changes, the rotation of the elliptical plate 43 will extrude the first buffer mechanism 24. The piston rod 244 slides in the sleeve 241, the limiting disc 245 compresses the spring 246, and the elastic force generated by the spring 246 resists the extrusion force of the elliptical plate 43, thereby playing a buffering role. At the same time, the pulley 247 slides on the side wall of the elliptical plate 43, thereby reducing the frictional resistance and making the buffering process more stable.

[0046] The tail of the sleeve 241 is provided with a hydraulic cylinder 243, which is inserted in the fixing groove in the inside of the shell 21. The tail of the piston rod 244 is provided with a piston. The piston rod 244 is slidably connected in the inside of the hydraulic cylinder 243. The side wall of the hydraulic cylinder 243 is fixedly connected with a mounting disc 242, which is fixedly mounted on the side wall of the shell 21 through screws. When the piston rod 244 is extruded to move into the sleeve 241, the piston at the tail of the piston rod 244 slides in the hydraulic cylinder 243, extrudes the liquid in the hydraulic cylinder 243, and the liquid flows in the hydraulic cylinder 243, thereby further consuming energy and enhancing the buffering effect.

[0047] The bottom of the rotating shaft assembly 4 is provided with a secondary buffering mechanism, which is rotationally connected in a rotating groove 23 formed in the inside of the fixing disc 3, and comprises an upper protruding jaw 44, an elastic body 45, a lower protruding jaw 46 and a driving shaft 47. The top surface of the upper protruding jaw 44 is integrally formed with the bottom surface of the rotating shaft body 42. The upper protruding jaw 44 and the lower protruding jaw 46 are inserted with each other. The elastic body 45 is clamped between the upper protruding jaw 44 and the lower protruding jaw 46. The bottom surface of the lower protruding jaw 46 is integrally formed with the driving shaft 47 for driving the valve. When the driving shaft 47 is subjected to the reaction force of the external valve and other loads, the elastic body 45 between the upper protruding jaw 44 and the lower protruding jaw 46 will be elastically deformed. The elastic member is in the shape of a plum blossom. The elastic body 45 is made of polyurethane and other elastic materials. When the upper protruding jaw 44 and the lower protruding jaw 46 are dislocated due to torque, the elastic body 45 is subjected to extrusion deformation, thereby playing a buffering role. The output end of the actuator can buffer the reaction force of the load, thereby avoiding damage to the valve and other equipment caused by overshoot or emergency stop of the actuator.

[0048] The inside of the fixing disc 3 is provided with a mounting groove 25, and the bearing 26 is mounted in the mounting groove 25. The side wall of the upper protruding jaw 44 and the lower protruding jaw 46 is inserted with the inner ring of the bearing 26. This reduces energy loss and component wear, improves the working efficiency and service life of the entire secondary buffering mechanism, and ensures that it can stably play a flexible buffering role in long-term operation.

[0049] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible control variable frequency electric actuator characterized by: The bottom surface of the electric actuator (1) is fixedly installed with a flexible control assembly (2) through screws, the output shaft of the electric actuator (1) is in transmission connection with a rotating shaft assembly (4) inside the flexible control assembly (2), the flexible control assembly (2) comprises a shell (21), a shaft hole (22), a buffer mechanism and a fixed disc (3), the two sides of the shell (21) are fixedly installed on the bottom surface of the electric actuator (1) through screws, the bottom surface of the shell (21) is integrally formed with the fixed disc (3), the top surface of the shell (21) is provided with the shaft hole (22), the rotating shaft assembly (4) is rotatably connected in the shaft hole (22), the rotating shaft assembly (4) comprises an input shaft (41), a rotating shaft body (42) and an elliptical plate (43), the input shaft (41) is integrally formed with the top surface of the rotating shaft body (42), the side wall of the rotating shaft body (42) is integrally formed with the elliptical plate (43), the elliptical plate (43) is rotatably connected in a rotating groove (23) formed inside the shell (21) with the rotating shaft body (42) as the center; The inside of the shell (21) is provided with a fixed groove on each side, a first-order buffer mechanism (24) is respectively inserted and installed in the fixed groove, the end of the first-order buffer mechanism (24) is in sliding connection with the side wall of the elliptical plate (43), and the elastic element inside the first-order buffer mechanism (24) is in sliding connection in the buffer mechanism; The bottom of the rotating shaft assembly (4) is provided with a second-order buffer mechanism, which is rotatably connected in the rotating groove (23) formed inside the fixed disc (3).

2. A flexible controlled variable frequency electric actuator according to claim 1 wherein: The elastic element comprises a sleeve (241), a piston rod (244), a limiting disc (245), a spring (246) and a pulley (247), the sleeve (241) is inserted into the fixed groove inside the shell (21), the inside of the sleeve (241) is in sliding connection with the piston rod (244), the end of the piston rod (244) is fixedly connected with the limiting disc (245), the limiting disc (245) is in sliding connection inside the sleeve (241), the spring (246) is sleeved on the side wall of the piston rod (244) between the limiting disc (245) and the sleeve (241), the end of the piston rod (244) is provided with a groove, the pulley (247) is rotatably connected in the groove through a shaft, and the pulley (247) is in sliding connection on the side wall of the elliptical disc.

3. A flexible controlled variable frequency electric actuator according to claim 2 wherein: The tail of the sleeve (241) is provided with a hydraulic cylinder (243), the hydraulic cylinder (243) is inserted into the fixed groove inside the shell (21), the tail of the piston rod (244) is provided with a piston, the piston rod (244) is in sliding connection inside the hydraulic cylinder (243), the side wall of the hydraulic cylinder (243) is fixedly connected with a mounting disc (242), and the mounting disc (242) is fixedly installed on the two side walls of the shell (21) through screws.

4. A flexible controlled variable frequency electric actuator as claimed in claim 1, wherein: The secondary buffering mechanism comprises an upper pawl (44), an elastic body (45), a lower pawl (46) and a driving shaft (47), the top surface of the upper pawl (44) is integrally formed with the bottom surface of the rotating shaft body (42), the upper pawl (44) and the lower pawl (46) are mutually inserted, the elastic body (45) is clamped between the upper pawl (44) and the lower pawl (46), and the bottom surface of the lower pawl (46) is integrally formed with the driving shaft (47) for driving the valve.

5. A flexible controlled variable frequency electric actuator according to claim 4 wherein: The elastic member is in the shape of a plum blossom.

6. A flexible controlled variable frequency electric actuator according to claim 5 wherein: The inside of the fixing disc (3) is provided with a mounting groove (25), the mounting groove (25) is provided with a bearing (26), and the side walls of the upper pawl (44) and the lower pawl (46) are inserted with the inner ring of the bearing (26).

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