Closed-loop control electric push rod with built-in limit

Abstract

The utility model relates to the technical field of electric push rods, in particular to a closed-loop control electric push rod with a built-in limiting device, which comprises a controller, an encoder, a stepping motor, a shell, a speed reducer, a screw rod, a nut, a hollow pipe and an optocoupler, the controller and the encoder are sequentially mounted at the rear end of the stepping motor, and the shell is fixed at the front end of the stepping motor. The lead screw is in power connection with an output shaft of the stepping motor through the speed reducer, the nut is in threaded connection with the lead screw and is axially connected into the shell in a sliding mode, one end of the hollow pipe is fixed to the nut, the other end of the hollow pipe extends out of the shell, and the optocoupler is installed on the end face abutting against the nut when the nut is located at the initial position. According to the scheme, the optocoupler limit switch is integrated at the limit position of the electric push rod and used for detecting whether the push rod reaches the preset position or not, and the problem that under the condition that an effective tail end position detection mechanism does not exist, a motor may be damaged due to excessive driving or cannot be stopped in time under the emergency situation, and consequently potential safety hazards are caused is solved.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically a closed-loop control electric actuator with built-in limit. Background Technology

[0002] In modern automation and control systems, linear actuators serve as key actuating components, finding widespread application across various fields, from industrial manufacturing to smart homes. However, traditional linear actuators face several challenges in practical applications:

[0003] Traditional linear actuators typically employ open-loop control systems, meaning they lack real-time feedback on actual position and load conditions. This design leads to poor performance in applications requiring precise position control, such as precision machining or medical equipment, where positioning errors can occur, impacting overall performance. Many existing linear actuators rely on externally mounted limit switches to prevent overtravel, which not only increases system complexity and cost but can also cause malfunctions due to improper installation. More importantly, without an effective end-effector position detection mechanism, the motor may be damaged by overdrive or fail to stop in time in emergencies, creating safety hazards. Utility Model Content

[0004] The present invention aims to provide a closed-loop control electric actuator with built-in limit to solve the problem that the motor may be damaged due to overdrive or fail to stop in time in an emergency when there is no effective end position detection mechanism, thus causing safety hazards.

[0005] To achieve the above objectives, the basic solution of this utility model is as follows: A closed-loop control electric actuator with built-in limit includes a controller, an encoder, a stepper motor, a housing, a reducer, a lead screw, a nut, a hollow tube, and an optocoupler. The controller and encoder are sequentially installed at the rear end of the stepper motor, the housing is fixed at the front end of the stepper motor, the lead screw is poweredly connected to the output shaft of the stepper motor through the reducer, the nut is threaded onto the lead screw, and the nut is axially slidably connected inside the housing. One end of the hollow tube is fixed to the nut, and the other end of the hollow tube extends out of the housing. The optocoupler is installed on the end face that abuts against the nut when it is in its initial position.

[0006] Furthermore, it also includes a connecting flange, the housing is connected to the stepper motor through the connecting flange, the inner side of the connecting flange can abut against the nut, and the optocoupler is fixed on the end face of the inner side of the connecting flange that abuts against the nut.

[0007] Furthermore, it also includes a flange, through which the reducer is connected to the stepper motor.

[0008] Furthermore, it also includes several guide rails, which are axially fixed inside the housing, and the nut is slidably connected to the several guide rails.

[0009] The beneficial effects of this solution are: (1) This solution integrates an optocoupler limit switch at the extreme position of the electric push rod to detect whether the push rod has reached the predetermined position. This design can not only respond quickly, but also provide accurate position feedback signals to ensure the safe operation of the equipment.

[0010] (2) This scheme uses an encoder to monitor the actual position of the electric actuator in real time and compare it with the target position. Based on the error signal, the control system can automatically adjust the speed and direction of the motor to achieve precise position control.

[0011] (3) This solution uses high-strength materials to manufacture the lead screw and nut, and optimizes the transmission ratio to significantly improve the output torque, so that it can maintain stable operation even under high load conditions. Attached Figure Description

[0012] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0014] Figure 3 This is a schematic diagram of the connection between the guide rail and the nut in an embodiment of this utility model. Detailed Implementation

[0015] 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.

[0016] The reference numerals in the accompanying drawings include: controller 1, encoder 2, stepper motor 3, connecting flange 4, housing 5, flange plate 6, reducer 7, lead screw 8, nut 9, guide rail 10, hollow tube 11, optocoupler 12.

[0017] Example

[0018] The basics are as follows: Figure 1 , Figure 2 , Figure 3The diagram shows a closed-loop control electric actuator with built-in limit switches, comprising a controller, encoder, stepper motor, connecting flange, housing, flange plate, reducer, lead screw, nut, two guide rails, hollow tube, and optocoupler. The controller and encoder are sequentially installed at the rear end of the stepper motor. The housing is fixed to the front end of the stepper motor via the connecting flange. The lead screw is poweredly connected to the output shaft of the stepper motor via the reducer, which is connected to the stepper motor via the flange plate. The nut is threaded onto the lead screw and axially slidably connected inside the housing. The two guide rails are axially fixed inside the housing, and the nut is slidably connected to the two guide rails. One end of the hollow tube is fixed to the nut, and the other end extends out of the housing, with the inner side of the connecting flange abutting against the nut. The optocoupler is fixed to the end face of the connecting flange abutting against the nut.

[0019] The specific implementation process is as follows: The stepper motor drives the lead screw to rotate, and the rotation of the lead screw drives the nut to move along the lead screw, thereby driving the hollow tube to extend and retract. When the nut reaches the limit position close to the stepper motor, the end of the nut triggers the optocoupler. At this time, the push rod reaches the predetermined position and the motor stops working.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A closed loop control electric push rod with built-in limit, characterized in that: The utility model discloses a control ware, encoder, step motor, shell, speed reducer, screw rod, nut, hollow pipe and photoelectric coupler, the control ware and encoder are installed in step motor rear end in proper order, the shell is fixed in step motor front end, the screw rod is power connected with the output shaft of step motor through speed reducer, the nut is screwed on the screw rod, the nut is axially slidingly connected in the shell, one end of the hollow pipe is fixed with the nut, the other end of the hollow pipe is out of the shell, and the photoelectric coupler is installed on the end face with the nut in the initial position.

2. The closed loop control electric push rod with built-in limit according to claim 1, wherein: It also includes a connecting flange, the shell is connected with the step motor through the connecting flange, the inside of the connecting flange can be in abutment with the nut, and the photoelectric coupler is fixed on the end face of the inside of the connecting flange in abutment with the nut.

3. The closed loop control electric push rod with built-in limit according to claim 2, characterized in that: It also includes a flange piece, the speed reducer is connected with the step motor through the flange piece.

4. The closed loop control electric push rod with built-in limit according to claim 3, characterized in that: It also includes several guide rails, the nut is slidingly connected on the several guide rails, and the several guide rails are axially fixed on the inside of the shell.

Images