Rotary ascending electric actuator

Abstract

The utility model discloses a rotary rising electric actuator which comprises an equipment host, the bottom of the equipment host is a linear driving end, and the linear driving end is connected with a control end of external equipment; the driving mechanism is arranged in the equipment host; the transmission screw rod is driven by the driving mechanism to rotate circumferentially; the transmission nut is mounted on the transmission lead screw, and the transmission lead screw drives the transmission nut to rotate; and the fixing nut is fixedly mounted at the linear driving end of the equipment host. The transmission lead screw is driven by the motor, conversion from rotary motion to linear motion is achieved through a spiral pair structure between the lead screw and the transmission nut, and then an external valve is driven to conduct automatic opening and closing control. The structure not only has good self-locking capability and can still keep the current position in a power-off state, but also realizes higher displacement control precision through a precise thread transmission mechanism, and meets the automatic control requirement in a high-requirement scene.

Description

Technical Field

[0001] This utility model relates to an electric actuator, specifically a rotary lifting electric actuator. Background Technology

[0002] Currently, in the field of industrial automation control, external equipment such as valves in pipeline systems often require actuators to open and close. Common types of actuators include manual actuators, electro-hydraulic actuators, and some pneumatic actuators. Among these, electro-hydraulic actuators are widely used in high-load conditions due to their high driving force and control precision. However, electro-hydraulic actuators rely on hydraulic systems for their power source, resulting in complex structures, high costs, and demanding maintenance requirements. Furthermore, they still exhibit response lag and fluctuations in control precision in precision applications.

[0003] On the other hand, most traditional electric actuators adopt a linear drive structure with push rods, which generally suffers from defects such as low positioning accuracy, limited stroke, and lack of self-locking function, making it difficult to meet the requirements of working conditions with high control accuracy and operational reliability. Especially in valve control scenarios of certain critical equipment, actuators with traditional structures cannot maintain their output position when not powered on, which can easily lead to system operation risks. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a rotary lifting electric actuator, which can effectively overcome the shortcomings of the prior art.

[0005] This utility model is achieved through the following technical solution: a rotary lifting electric actuator, comprising:

[0006] The device host has a linear drive end at its bottom, which is connected to the control end of an external device.

[0007] The drive mechanism is located inside the main unit of the device;

[0008] The lead screw is driven to rotate circumferentially via the drive mechanism;

[0009] A transmission nut is mounted on the transmission screw, and the transmission screw drives the transmission nut to rotate.

[0010] A fixing nut is fixedly installed on the linear drive end of the main unit of the device. The outer side of the transmission nut is threadedly engaged with the inner side of the fixing nut, thereby converting the rotational motion of the transmission nut into up-and-down lifting motion.

[0011] As a preferred technical solution, the output end of the fixing nut forms a connecting end, which is connected to the valve stem of an external device through a connecting block.

[0012] As a preferred technical solution, the drive mechanism uses a motor to drive the transmission screw to rotate.

[0013] As a preferred technical solution, the motor is a DC brushless motor.

[0014] As a preferred technical solution, the output end of the brushless DC motor is connected to the transmission lead screw via a coupling.

[0015] This utility model discloses a rotary lifting electric actuator, comprising:

[0016] The device host has a rotary drive end at its bottom, which is connected to the control end of an external device.

[0017] The drive mechanism is located inside the main unit of the device;

[0018] The lead screw is driven to rotate circumferentially via the drive mechanism;

[0019] A transmission nut is mounted on the transmission screw, and the transmission screw drives the transmission nut to rotate.

[0020] The piston sleeve is fixedly installed on the bottom outer side of the main unit of the equipment. The outer side of the transmission nut is smoothly fitted with the inner side of the piston sleeve. The transmission nut rotates through the drive mechanism.

[0021] As a preferred technical solution, the external device is provided with a lead screw and nut mechanism, and the transmission nut is fixedly connected to the lead screw and nut mechanism through a connecting block.

[0022] The beneficial effects of this utility model are as follows: This utility model proposes a rotary lifting electric actuator. This actuator uses a motor to drive a transmission screw, and the conversion of rotary motion to linear motion is achieved through the helical pair structure between the screw and the transmission nut, thereby driving an external valve for automatic opening and closing control. This structure not only has good self-locking capability, maintaining its current position even in the event of a power outage, but also achieves high displacement control accuracy through a precision thread transmission mechanism, meeting the automation control requirements of demanding scenarios. Compared with traditional hydraulic or push-rod type electric actuators, this utility model has significant advantages such as simple structure, fast control response, high accuracy, low cost, and easy maintenance, making it particularly suitable for intelligent transformation applications in fields such as precision valve control. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. DC brushless motor; 2. Coupling; 3. Drive screw; 4. Drive nut; 5. Fixing nut; 6. Piston sleeve. Detailed Implementation

[0028] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0029] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0030] Example 1:

[0031] like Figure 1 As shown, this embodiment provides a rotary lifting electric actuator, including a main unit. The bottom of the main unit has a linear drive end for connecting to the control end of an external device, such as the valve stem structure of an external valve. The main unit contains a drive mechanism, preferably driven by a motor, which can be a DC brushless motor 1, offering advantages such as low noise, fast control response, and long service life.

[0032] The motor is connected to a transmission screw 3 via a coupling 2. The coupling 2 not only helps compensate for axial assembly errors but also stably transmits the motor's output torque. The transmission screw 3 is arranged along the axial direction of the electric actuator and can achieve continuous circumferential rotation under the drive of the motor.

[0033] A transmission nut 4 is fitted onto the transmission screw 3. During rotation, the transmission screw 3 drives the transmission nut 4 to rotate synchronously. The outer surface of the transmission nut 4 is threadedly connected to the inner surface of the fixing nut 5, which is fixedly installed at the bottom of the main unit of the equipment, forming a typical helical pair structure. In this structure, since the fixing nut 5 cannot rotate, the transmission nut 4 moves up and down along the axial direction of the fixing nut 5 when it rotates, thereby converting the rotational motion into linear motion and achieving precise drive of external equipment.

[0034] To enable connection with external devices, the output end of the fixing nut 5 is provided with a connecting end, which is fixedly connected to the valve stem structure of the external valve via a connecting block. Therefore, when the transmission nut 4 moves up and down within the fixing nut 5, it can drive the connecting block and the valve stem to perform corresponding linear displacements, thereby achieving automatic opening and closing control of the valve.

[0035] The entire transmission process has good self-locking properties. When the motor stops running after power failure, the threaded pair structure between the lead screw and the fixed nut 5 can maintain its current position by itself, effectively preventing the valve from malfunctioning due to inertia or external force, and improving the safety and stability of the system operation.

[0036] Example 2:

[0037] like Figure 2 As shown, in order to further optimize the actuator structure and improve its adaptability to different types of valves, this embodiment improves the structure based on embodiment 1 and proposes a rotary lifting electric actuator with a more modular structure and stronger linkage.

[0038] The electric actuator described in this embodiment also includes a main unit, the bottom of which is a rotary drive end, and is connected to external equipment (such as a valve) via a connecting block. The main unit is equipped with a drive mechanism, which is preferably a DC brushless motor 1, and the motor output end is connected to a transmission lead screw 3 via a coupling 2.

[0039] The transmission screw 3 can rotate in a circumferential direction under the drive of a motor, and a transmission nut 4 is sleeved on it. The rotation of the transmission screw 3 drives the transmission nut 4 to rotate synchronously. Unlike embodiment 1, the outer side of the transmission nut 4 has a smooth fit with the piston sleeve 6 fixedly installed at the bottom of the main unit of the equipment, that is, the transmission nut 4 can move up and down within the piston sleeve 6.

[0040] In this embodiment, the linear motion conversion is no longer achieved through the fixed nut 5 inside the main unit of the device. Instead, the threaded transmission function is transferred to an external device (i.e., the valve). The external valve structure itself has a screw-nut mechanism, meaning its valve stem is in the form of a screw, and a nut that engages with its threads is fitted externally. The transmission nut 4 in the electric actuator is fixedly connected to this external nut structure through a connecting block. During the rotation of the transmission nut 4, the valve stem is driven to rise and fall through the threaded engagement with the valve screw.

[0041] To accommodate the axial movement of the internal transmission nut 4 during rotation, the transmission mechanism within the main unit of the equipment, including the motor, coupling 2, and its supporting structure, is designed to allow for a limited range of vertical movement. This means that axial space is reserved between components to ensure that while the transmission nut 4 rotates and drives the external structure to rise and fall, the internal position of the main unit can automatically adjust. To prevent rotational misalignment, the motor body and transmission nut 4 are also radially positioned using a limiting structure, thus achieving the functional requirements of vertical mobility and circumferential locking.

[0042] Compared with Embodiment 1, this embodiment realizes the external placement of the key lifting function, which not only simplifies the internal structure of the electric actuator, but also improves the compatibility of the actuator with various types of valve systems. It is particularly suitable for industrial pipeline systems that require modular deployment or adaptation of non-standard valves.

[0043] Through the detailed description of the above embodiments, it can be clearly seen that the electric actuator of this utility model not only has high precision, high stability and good self-locking performance, but also has a flexible structure and strong adaptability, and is especially suitable for industrial automation equipment that requires precise control and frequent start-up and shutdown.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A rotary rising electric actuator characterized by, include: The device host has a linear drive end at its bottom, which is connected to the control end of an external device. The drive mechanism is located inside the main unit of the device; The lead screw (3) is driven to rotate circumferentially through the drive mechanism; A transmission nut (4) is installed on the transmission screw (3), and the transmission screw (3) drives the transmission nut (4) to rotate; The fixing nut (5) is fixedly installed on the linear drive end of the main unit of the equipment. The outer side of the transmission nut (4) is threadedly engaged with the inner side of the fixing nut (5) to convert the rotational motion of the transmission nut (4) into up-and-down lifting motion.

2. A rotary rising electric actuator according to claim 1, characterized in that: The output end of the fixing nut (5) forms a connection end, which is connected to the valve stem of the external device through a connecting block.

3. The rotary lifting electric actuator according to claim 1, characterized in that: The drive mechanism uses a motor, which drives the transmission screw (3) to rotate.

4. The rotary lifting electric actuator according to claim 3, characterized in that: The motor is a DC brushless motor (1).

5. The rotary lifting electric actuator according to claim 4, characterized in that: The output end of the brushless DC motor (1) is connected to the lead screw (3) via a coupling (2).

6. A rotary lifting electric actuator, characterized in that, include: The device host has a rotary drive end at its bottom, which is connected to the control end of an external device. The drive mechanism is located inside the main unit of the device; The lead screw (3) is driven to rotate circumferentially through the drive mechanism; A transmission nut (4) is installed on the transmission screw (3), and the transmission screw (3) drives the transmission nut (4) to rotate; The piston sleeve (6) is fixedly installed on the bottom outer side of the main unit of the device. The outer side of the transmission nut (4) is smoothly fitted with the inner side of the piston sleeve (6). The transmission nut (4) rotates through the drive mechanism.

7. The rotary lifting electric actuator according to claim 6, characterized in that: The external device is equipped with a lead screw and nut mechanism, and the transmission nut (4) is fixedly connected to the lead screw and nut mechanism through a connecting block.

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