Straight stroke driving type electric actuating mechanism

Abstract

The utility model relates to the technical field of electric actuating mechanisms, in particular to a straight stroke driving type electric actuating mechanism which comprises a speed reducer and a motor, the motor is installed on one side of the speed reducer, a support is fixedly installed at the bottom end of the speed reducer, a limiting plate is welded and fixed to the inner side of the support, and the upper end face of the limiting plate is fixedly connected with a stabilizing assembly. An output shaft is inserted into the stabilizing assembly and fixedly connected with a fixing ring and a positioning ring in a penetrating mode, the stabilizing assembly comprises a hollow pipe, a columnar groove and a strip-shaped groove are formed in the inner side of the hollow pipe, a holding mechanism is slidably connected into the columnar groove, a compression spring is arranged at the bottom end of the holding mechanism, the holding mechanism comprises a sliding ring, and a ring groove and a mounting groove are formed in the sliding ring. According to the utility model, when the output shaft retracts after extending to the maximum stroke, multi-stage buffering and dynamic constraint can be carried out on the retraction motion of the output shaft, and radial movement caused by inertia force is effectively inhibited.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically a linear drive electric actuator. Background Technology

[0002] An electric actuator is an automated drive device that uses an electric motor as a power source to convert electrical energy into mechanical motion. It typically consists of an electric motor, a reduction gear, a control circuit, and a position feedback device to achieve automatic control and regulation of industrial equipment such as valves and dampers.

[0003] Linear drive electric actuators are a common type of electric actuator. They output linear reciprocating motion and convert rotational power into smooth linear thrust or pull through a motor-driven reduction mechanism. They are characterized by high positioning accuracy and fast response speed.

[0004] In linear drive electric actuators, some applications require a large linear stroke, which in turn requires a long extension length of the output shaft. When the long output shaft extends to its maximum stroke and then retracts, it will oscillate radially due to its large mass and the inertial force generated during the movement. This instability not only affects the positioning accuracy but may also cause the actuator to jam or malfunction. Therefore, a linear drive electric actuator is proposed to address the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a linear drive electric actuator to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A linear-stroke driven electric actuator includes a reducer and a motor. The motor is mounted on one side of the reducer, and a bracket is fixedly mounted on the bottom of the reducer. A limit plate is welded and fixed to the inner side of the bracket. A stabilizing component is fixedly connected to the upper surface of the limit plate. An output shaft is inserted into the stabilizing component. A fixing ring and a positioning ring are fixedly connected through the output shaft. The stabilizing component includes a hollow tube. A columnar groove and a strip-shaped groove are formed on the inner side of the hollow tube. A clamping mechanism is slidably connected in the columnar groove. A compression spring is provided at the bottom end of the clamping mechanism. The clamping mechanism includes a sliding ring. An annular groove and a mounting groove are formed in the sliding ring. A rotating shaft is fixedly installed in the mounting groove. A torsion spring is sleeved on the outer side of the rotating shaft. A locking rod is fixedly connected through the torsion spring. A rubber ring is embedded in the annular groove. A short rod is inserted into the rubber ring. A pressure plate is fixedly connected to the upper end of the short rod.

[0008] As a further optimization of this utility model, the outer diameter of the fixing ring is equal to the inner diameter of the hollow tube, the fixing ring is disposed in the hollow tube, and the fixing ring and the hollow tube form a sliding pair, and the upper end face of the positioning ring is in contact with the bottom end face of the limiting plate.

[0009] As a further optimization of this utility model, the diameter of the columnar groove is equal to the outer diameter of the clamping mechanism, the edge of the clamping mechanism is arc-shaped, and the columnar groove and the strip groove are connected.

[0010] As a further optimization of this utility model, a plurality of locking blocks are fixedly connected to the side wall of the strip groove. The locking blocks are quarter-circles projected along the axial direction, and the plurality of locking blocks are distributed equidistantly in the strip groove along the longitudinal direction.

[0011] As a further optimization of this utility model, the compression spring is sleeved on the outside of the output shaft, and the inner circumferential surface of the compression spring contacts the outer circumferential surface of the output shaft. The upper and lower ends of the compression spring respectively abut against the bottom end surface of the clamping mechanism and the upper end surface of the limiting plate.

[0012] As a further optimization of this utility model, the sliding ring is slidably sleeved on the output shaft, there is a gap between the inner side of the rubber ring and the outer surface of the output shaft, a cavity is opened on the inner side of the rubber ring, and the upper end face of the rubber ring is in contact with the bottom end face of the pressure plate.

[0013] As a further optimization of this utility model, the torsion spring is fixedly connected to the two side walls of the mounting groove at both ends, and the bottom end of the short rod is inserted into the mounting groove and abuts against the outside of the clamp rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, by setting a stabilizing component, when the output shaft retracts after extending to its maximum stroke, it can perform multi-level buffering and dynamic constraint on the retraction motion of the output shaft, effectively suppressing radial movement caused by inertial force. While ensuring the normal extension and retraction motion of the output shaft, it improves the stability and positioning accuracy of the retraction process, and avoids jamming or control failure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the limiting plate of this utility model;

[0018] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0019] Figure 4This is a cross-sectional structural diagram of the stabilizing component of this utility model;

[0020] Figure 5 This is a schematic diagram of the exploded structure of the stabilizing component of this utility model;

[0021] Figure 6 This is a schematic diagram of the clamping mechanism of this utility model;

[0022] Figure 7 This is a schematic diagram of the explosive structure of the clamping mechanism of this utility model.

[0023] In the diagram: 1. Reducer; 2. Motor; 3. Bracket; 4. Limiting plate;

[0024] 5. Stabilizing component; 51. Hollow tube; 52. Columnar groove; 53. Strip groove; 54. Clamping block; 55. Clamping mechanism; 551. Sliding ring; 552. Ring groove; 553. Mounting groove; 554. Rotating shaft; 555. Torsion spring; 556. Clamping rod; 557. Rubber ring; 558. Short rod; 559. Pressure plate; 56. Compression spring;

[0025] 6. Output shaft; 7. Retaining ring; 8. Positioning ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Please see Figures 1-7 This utility model provides a technical solution:

[0029] A linear-stroke driven electric actuator includes a reducer 1 and a motor 2. The motor 2 is mounted on one side of the reducer 1, and a bracket 3 is fixedly mounted on the bottom end of the reducer 1. A limit plate 4 is welded and fixed to the inner side of the bracket 3. A stabilizing component 5 is fixedly connected to the upper end face of the limit plate 4. An output shaft 6 is inserted into the stabilizing component 5. A fixing ring 7 and a positioning ring 8 are fixedly connected through the output shaft 6. The stabilizing component 5 includes a hollow tube 51. A columnar groove 52 and a strip groove 53 are formed on the inner side of the hollow tube 51. A locking block 54 is fixedly installed in the strip groove 53. A clamping mechanism 55 is slidably connected in 52. The bottom end of the clamping mechanism 55 is provided with a compression spring 56. The clamping mechanism 55 includes a sliding ring 551. The sliding ring 551 has an annular groove 552 and a mounting groove 553. A rotating shaft 554 is fixedly installed in the mounting groove 553. A torsion spring 555 is sleeved on the outside of the rotating shaft 554. A locking rod 556 is fixedly connected through the torsion spring 555. A rubber ring 557 is embedded in the annular groove 552. A short rod 558 is inserted into the rubber ring 557. A pressure plate 559 is fixedly connected to the upper end of the short rod 558.

[0030] As a further implementation of this solution, the outer diameter of the fixing ring 7 is equal to the inner diameter of the hollow tube 51. The fixing ring 7 is set in the hollow tube 51, and the fixing ring 7 and the hollow tube 51 form a sliding pair. The upper end face of the positioning ring 8 is in contact with the bottom end face of the limiting plate 4. The design of the mutual cooperation between the fixing ring 7 and the hollow tube 51 allows the axial movement of the fixing ring 7 in the hollow tube 51 to be guided by the hollow tube 51. The design of the upper end face of the positioning ring 8 being in contact with the bottom end face of the limiting plate 4 allows the positioning ring 8 to form a stable axial limit with the limiting plate 4 in the reset state, ensuring effective restriction of the axial displacement of the positioning ring 8.

[0031] As a further implementation of this scheme, the diameter of the columnar groove 52 is equal to the outer diameter of the clamping mechanism 55, the edge of the clamping mechanism 55 is arc-shaped, the columnar groove 52 and the strip groove 53 are connected, the columnar groove 52 provides guidance and limiting fit for the clamping mechanism 55, and at the same time, the arc-shaped edge of the clamping mechanism 55 can reduce the resistance when the two are in relative displacement, avoid stress concentration, and reduce wear. The design of the columnar groove 52 and the strip groove 53 being connected is conducive to avoiding the internal structure of the clamping mechanism 55 and reserving movement space.

[0032] As a further implementation of this solution, a locking block 54 is fixedly connected to the side wall of the strip groove 53. The locking block 54 is a quarter circle projected along the axial direction. Multiple locking blocks 54 are distributed equidistantly in the strip groove 53 along the longitudinal direction. The shape of the locking block 54 is set so that its surface forms a guide slope, so that when it comes into contact with other parts, it can avoid jamming and impact. Multiple locking blocks 54 form a multi-level locking position from top to bottom in the strip groove 53.

[0033] As a further implementation of this solution, the compression spring 56 is sleeved on the outside of the output shaft 6, and the inner circumferential surface of the compression spring 56 contacts the outer circumferential surface of the output shaft 6. The upper and lower ends of the compression spring 56 respectively abut against the bottom end surface of the clamping mechanism 55 and the upper end surface of the limiting plate 4. The design of the compression spring 56 and the setting of its relative position to the output shaft 6 can form radial positioning and guidance for the compression spring 56 itself, avoiding the compression spring 56 from deflecting, bending or becoming unstable during the extension and retraction process. The compression spring 56 is located between the clamping mechanism 55 and the limiting plate 4, and can continuously provide the clamping mechanism 55 with an upward elastic restoring force.

[0034] As a further implementation of this solution, the sliding ring 551 is slidably sleeved on the output shaft 6. There is a gap between the inner side of the rubber ring 557 and the outer surface of the output shaft 6. A cavity is opened on the inner side of the rubber ring 557. The upper end face of the rubber ring 557 is in contact with the bottom end face of the pressure plate 559. The design of the sliding ring 551 being slidably sleeved on the output shaft 6 can radially position and guide the sliding ring 551, ensuring that the sliding ring 551 makes stable axial linear movement along the output shaft 6, avoiding radial offset, jamming or tilting during the movement. When the sliding ring 551 is not pressed down, the rubber ring 557 is in an unpressurized state. In the unpressurized state, the rubber ring 557 does not contact the output shaft 6, which can avoid frictional resistance and ensure smooth movement of the output shaft 6. When the sliding ring 551 is pressed down, the rubber ring 557 will be squeezed by the pressure plate 559, producing elastic deformation, contracting inward and clamping the output shaft 6, achieving a fast and reliable clamping effect.

[0035] As a further implementation of this solution, the two ends of the torsion spring 555 are fixedly connected to the two side walls of the mounting groove 553, and the bottom end of the short rod 558 is inserted into the mounting groove 553 and abuts against the outside of the locking rod 556. The torsion spring 555 can always provide a stable reset torque for the locking rod 556, while the short rod 558 can also abut against and limit the locking rod 556. Under the mutual nesting and cooperation of the torsion spring 555 and the short rod 558, the locking rod 556 can reach a reliable locking state and has the ability to automatically switch between locking and releasing.

[0036] Working process: During operation, when the linear motion of the motor 2 main shaft is converted into the linear motion of the output shaft 6 through the motion conversion mechanism in the reducer 1, the output shaft 6 moves downward, causing the fixed ring 7 and the positioning ring 8 to move downward. After the fixed ring 7 moves downward a certain distance, it will contact the pressure plate 559 and press the pressure plate 559 downward, causing the pressure plate 559 to move downward and deform the rubber ring 557. When the rubber ring 557 deforms, the internal air distribution changes, causing the rubber ring 557 in the ring groove 552 to eliminate the gap between the inner side and the outer surface of the output shaft 6. The gap is created, thus clamping the output shaft 6. At the same time, the short rod 558 moves downward and abuts against the locking rod 556. At this time, the outer surface of the locking rod 556 contacts the outer surface of the locking block 54. As the fixing ring 7 pushes the clamping mechanism 55 downward, the locking rod 556 and the locking block 54 squeeze each other, causing the locking rod 556 to rotate around the rotating shaft 554 at a certain angle and drive the torsion spring 555 to undergo elastic deformation. When the locking rod 556 and the locking block 54 no longer squeeze each other, the locking rod 556 will reset under the elastic force generated by the elastic deformation of the torsion spring 555 and then form a locking limit with the locking block 54.

[0037] When the output shaft 6 retracts under the control of motor 2, the fixed ring 7 moves upward and gradually reduces the pressure applied to the sliding ring 551 by the pressure plate 559 and the rubber ring 557. When the bottom surface of the fixed ring 7 is still in contact with the upper surface of the pressure plate 559, the locking rod 556 is abutted by the short rod 558 fixedly connected to the pressure plate 559 and cannot rotate around the shaft 554, thus keeping the locking rod 556 and the locking block 54 engaged. When the bottom surface of the fixed ring 7 separates from the upper surface of the pressure plate 559, the pressure plate 559 no longer squeezes the rubber ring 557, and the rubber ring 557 no longer deforms to tighten the output shaft 6. At the same time, the locking rod 556 can rotate around the shaft 554, allowing the locking rod 556 to move freely. Separated from the locking block 54, the sliding ring 551 slides rapidly upward in the columnar groove 52 under the action of the compression spring 56 restoring its elastic deformation, causing the pressure plate 559 to contact the fixed ring 7 again and transfer the interaction force to the rubber ring 557 again, causing the rubber ring 557 to deform and tighten the output shaft 6, thus suppressing the radial sway when the output shaft 6 retracts. As the locking rod 556 continuously engages and disengages with the longitudinally equidistant locking blocks 54, the clamping mechanism 55 performs multi-stage buffering and step-by-step limiting on the retraction movement of the output shaft 6, effectively suppressing the radial movement of the output shaft 6 during the retraction process, until the positioning ring 8 contacts the limiting plate 4, and all components of the device are reset.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct stroke drive electric actuator comprising a reducer (1) and an electric motor (2), characterized in that: A motor (2) is installed on one side of the reducer (1), a bracket (3) is fixedly installed at the bottom of the reducer (1), a limit plate (4) is welded and fixed inside the bracket (3), a stabilizing component (5) is fixedly connected to the upper end of the limit plate (4), an output shaft (6) is inserted in the stabilizing component (5), and a fixing ring (7) and a positioning ring (8) are fixedly connected through the output shaft (6). The stabilizing component (5) includes a hollow tube (51), with a columnar groove (52) and a strip groove (53) opened on the inner side of the hollow tube (51). A clamping mechanism (55) is slidably connected in the columnar groove (52), and a compression spring (56) is provided at the bottom end of the clamping mechanism (55). The clamping mechanism (55) includes a sliding ring (551), in which a ring groove (552) and a mounting groove (553) are provided. A rotating shaft (554) is fixedly installed in the mounting groove (553). A torsion spring (555) is sleeved on the outside of the rotating shaft (554). A locking rod (556) is fixedly connected through the torsion spring (555). A rubber ring (557) is embedded in the ring groove (552). A short rod (558) is inserted into the rubber ring (557). A pressure plate (559) is fixedly connected to the upper end of the short rod (558).

2. A direct stroke actuator according to claim 1, wherein: The outer diameter of the fixing ring (7) is equal to the inner diameter of the hollow tube (51). The fixing ring (7) is set in the hollow tube (51) and forms a sliding pair with the hollow tube (51). The upper end face of the positioning ring (8) is in contact with the bottom end face of the limiting plate (4).

3. A direct stroke actuator as claimed in claim 1, wherein: The diameter of the columnar groove (52) is equal to the outer diameter of the clamping mechanism (55), the edge of the clamping mechanism (55) is arc-shaped, and the columnar groove (52) and the strip groove (53) are connected.

4. A direct stroke actuator as recited in claim 1 wherein: Multiple locking blocks (54) are fixedly connected to the side wall of the strip groove (53). The locking blocks (54) are projected as a quarter circle along the axial direction. The multiple locking blocks (54) are distributed equidistantly in the strip groove (53) along the longitudinal direction.

5. A direct stroke actuator as recited in claim 1 wherein: The compression spring (56) is sleeved on the outside of the output shaft (6), and the inner circumferential surface of the compression spring (56) is in contact with the outer circumferential surface of the output shaft (6). The upper and lower ends of the compression spring (56) respectively abut against the bottom end surface of the clamping mechanism (55) and the upper end surface of the limiting plate (4).

6. A direct stroke actuator as recited in claim 1 wherein: The sliding ring (551) is slidably sleeved on the output shaft (6). There is a gap between the inner side of the rubber ring (557) and the outer surface of the output shaft (6). A cavity is opened on the inner side of the rubber ring (557). The upper end face of the rubber ring (557) is in contact with the bottom end face of the pressure plate (559).

7. A direct stroke actuator as recited in claim 1 wherein: The torsion spring (555) is fixedly connected to the two side walls of the mounting groove (553) at both ends, and the bottom end of the short rod (558) is inserted into the mounting groove (553) and abuts against the outside of the clamp rod (556).

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