Electric push rod travel switch signal feedback system

Abstract

The utility model provides an electric push rod travel switch signal feedback system. The system comprises a driving motor, an optocoupler plate, a switch plate, an extension state indicating lamp and a retraction state indicating lamp. The driving motor is electrically connected with the optocoupler plate, and the optocoupler plate is electrically connected with the switch plate; the first circuit is used for controlling the operation of the optocoupler plate; the second circuit is used for detecting the work of the switch plate; the first circuit receives a signal that the driving motor drives the extending end of the electric push rod to extend to the maximum stroke position or retract to the minimum stroke position and transmits the signal to the second circuit, and whether the electric push rod runs to the maximum stroke position or the minimum stroke position is displayed in real time through the indicator lamp. The technical problem that whether the electric push rod reaches the limit position or not cannot be visually checked in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, and in particular to an electric linear actuator limit switch signal feedback system. Background Technology

[0002] Electric linear actuators are equipped with two built-in limit switches to limit the extension end of the actuator, preventing it from extending or retracting excessively and causing it to malfunction. The extension / retraction displacement of the electric linear actuator cannot be directly observed by the operator. Usually, the operator will start the drive motor multiple times until the drive motor can no longer drive the extension end to continue moving, which is when the extension end of the electric linear actuator is considered to have reached the correct position.

[0003] Chinese patent CN216699719U discloses a linear electric linear actuator, including a housing, a linear actuator sleeved inside the housing with its front end extending through the housing, a transmission device for driving the linear actuator to perform telescopic movement, a drive device connected to the transmission device, and a limiting device; the limiting device stops the linear actuator from moving to the corresponding position, making the linear actuator structure more compact while improving the safety of the linear actuator in use.

[0004] However, the operator cannot directly observe the extended and retracted positions of the electric actuator in this technical solution, and cannot directly determine whether the electric actuator has moved to the position corresponding to the limit switch. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an electric push rod limit switch signal feedback system. The system receives signals from the drive motor that cause the electric push rod to extend to its maximum stroke position or retract to its minimum stroke position, and transmits these signals to a second circuit. The system also displays the status of the push rod in real time via indicator lights, thus solving the technical problem in existing technologies where it is impossible to visually check whether the electric push rod has reached the corresponding position of the limit switch.

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

[0007] An electric actuator limit switch signal feedback system includes a drive motor, an optocoupler board, a switch board, and extension and retraction status indicator lights; the drive motor is electrically connected to the optocoupler board, and the optocoupler board is electrically connected to the switch board.

[0008] It also includes a first circuit for controlling the operation of the optocoupler board and a second circuit for detecting the operation of the switch board;

[0009] The first circuit receives a signal from the drive motor that drives the electric push rod to extend and touch the extension limit switch / retract and touch the retraction limit switch, and transmits it to the second circuit. The second circuit controls the extension status indicator / retraction status indicator to light up and determines whether the extension end of the electric push rod has effectively touched the extension limit switch / retraction limit switch.

[0010] As an improvement, the first circuit includes a first branch, which includes a first resistor and a first optocoupler. The input terminal of the first optocoupler is connected to the output signal of the drive motor, and its output terminal outputs the signal when the drive motor rotates to the correct position, and illuminates the extension status indicator light.

[0011] As an improvement, the first circuit further includes a second branch, which includes a second resistor and a second optocoupler; the input terminal of the second optocoupler is connected to the output signal of the drive motor, and its output terminal outputs the signal when the drive motor reverses to the correct position, and illuminates the retraction status indicator.

[0012] As an improvement, the first circuit also includes a reserved pin that connects to the second end of the second optocoupler.

[0013] As an improvement, the reserved pins are connected to the filter protector.

[0014] As an improvement, the reserved pins are connected to an overcurrent protector.

[0015] As an improvement, the second circuit includes a third branch, which includes a diode a and a third resistor; the input terminal of the diode a is connected to the output signal of the first optocoupler.

[0016] As an improvement, the second circuit further includes a fourth branch, which includes a diode b and a fourth resistor; the input terminal of the diode b is connected to the output signal of the second optocoupler.

[0017] As an improvement, the extended status indicator and the retracted status indicator are light-emitting diodes.

[0018] The beneficial effects of this utility model are as follows:

[0019] (1) The present invention receives the signal of the electric push rod extending to the maximum stroke / retracting to the minimum stroke position through the first circuit and transmits it to the second circuit, and displays whether it has reached the maximum / minimum stroke position in real time through the indicator light.

[0020] (2) By setting up filter protection pins, this utility model avoids noise or interference that may be encountered during signal transmission and improves signal transmission accuracy.

[0021] (3) This utility model achieves current limiting protection for electric push rod by setting overcurrent protection pins, thus avoiding damage to the motor caused by excessive current.

[0022] In summary, this utility model has the advantage of being able to visually indicate whether the electric push rod has reached its limit position through light. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the first circuit of this utility model;

[0025] Figure 3 This is a schematic diagram of the second circuit of this utility model. 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] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Example 1

[0029] like Figures 1-3As shown, this embodiment provides an electric actuator travel switch signal feedback system, including a drive motor 1, an optocoupler board 2, a switch board 3, and an extension status indicator 4 and a retraction status indicator 5; the drive motor 1 is electrically connected to the optocoupler board 2, and the optocoupler board 2 is electrically connected to the switch board 3; the switch board 3 is provided with limit switches 31 that limit the maximum and minimum travel of the electric actuator; the extension status indicator 4 and the retraction status indicator 5 can be connected to an external operation panel through signal transmission for easy observation by the operator;

[0030] It also includes a first circuit 6 for controlling the operation of the optocoupler 2 and a second circuit 7 for detecting the operation of the switch board 3;

[0031] The first circuit 6 receives a signal from the drive motor 1 that the extended end of the electric push rod extends and touches the extension limit switch / retracts and touches the retraction limit switch, and transmits it to the second circuit 7. The second circuit 7 controls the extension status indicator 4 / retraction status indicator 5 to light up, and determines whether the extended end of the electric push rod effectively touches the extension limit switch / retraction limit switch, that is, whether the travel of the extended end of the electric push rod has reached the maximum travel position / minimum travel position.

[0032] Of course, in this embodiment, if a middle position detection switch is provided in the middle or other positions of the electric push rod, the limit switch pressing signal of the middle position can also be displayed to determine whether the limit switch has reached the specified position.

[0033] As an improvement, the first circuit 6 includes a first branch 61, which includes a first resistor 611 and a first optocoupler 612. The input terminal of the first optocoupler 612 is connected to the output signal of the drive motor 1, and its output terminal outputs the signal when the drive motor 1 rotates to the forward position, and lights up the extension status indicator 4. The first resistor 611 is a pull-up resistor, which can provide a fixed level.

[0034] As an improvement, the first circuit 6 further includes a second branch 62, which includes a second resistor 621 and a second optocoupler 622. The input terminal of the second optocoupler 622 is connected to the output signal of the drive motor 1, and its output terminal outputs the signal when the drive motor 1 reverses to the correct position, and lights up the retraction status indicator 5. The second resistor 621 is a pull-up resistor that can provide a fixed level.

[0035] As an improvement, the first circuit 6 also includes a reserved pin 623 connected to the second end of the second optocoupler 622.

[0036] Preferably, pin 623 is reserved for connecting a filter protector, which is preferably a filter to avoid noise or interference that may be encountered during signal transmission and improve signal transmission accuracy.

[0037] Preferably, the reserved pin 623 can also be connected to an overcurrent protector to prevent excessive current in the circuit from damaging the motor and to ensure the safe and stable operation of the electric actuator.

[0038] Preferably, the second circuit 7 includes a third branch 71, which includes a diode a711 and a third resistor 712; the input terminal of the diode a711 is connected to the output signal of the first optocoupler 612.

[0039] Preferably, the second circuit 7 further includes a fourth branch 72, which includes a diode b721 and a fourth resistor 722; the input terminal of the diode b721 is connected to the output signal of the second optocoupler 622.

[0040] It should be noted that when the extension end of the drive motor 1 extends outward to its maximum stroke, pressing the limit switch on the switch plate 3 causes the first branch 61 to generate a high frequency and form a circuit. The first optocoupler 612 is turned on, causing the diode a711 to receive a signal and light up. The operator can determine whether the electric push rod has extended to the correct position based on the light / off state of the diode. This solves the technical problem in the prior art where there is no indicator light and the operator cannot determine the actual operating position of the electric push rod.

[0041] Similarly, when the extended end of the drive motor 1 retracts to its minimum stroke, the limit switch on the switch plate 3 is pressed, causing the second branch 62 to generate a high frequency and form a circuit. The second optocoupler 622 is turned on, causing the diode b721 to receive the signal and light up. The operator can judge whether the electric push rod has retracted to the correct position based on whether the diode b721 is on or off.

[0042] Preferably, the extended status indicator 4 and the retracted status indicator 5 are light-emitting diodes, which display signals to the operator in real time based on signal feedback, making it easier for the operator to judge the operating status of the electric push rod.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A signal feedback system for an electric actuator limit switch, characterized in that, It includes a drive motor, an optocoupler board, a switch board, and extension and retraction status indicator lights; the drive motor is electrically connected to the optocoupler board, and the optocoupler board is electrically connected to the switch board; It also includes a first circuit for controlling the operation of the optocoupler board and a second circuit for detecting the operation of the switch board; The first circuit receives a signal from the drive motor that drives the electric push rod to extend and touch the extension limit switch / retract and touch the retraction limit switch, and transmits it to the second circuit. The second circuit controls the extension status indicator / retraction status indicator to light up and determines whether the extension end of the electric push rod has effectively touched the extension limit switch / retraction limit switch.

2. The electric actuator limit switch signal feedback system according to claim 1, characterized in that, The first circuit includes a first branch, which includes a first resistor and a first optocoupler. The input terminal of the first optocoupler is connected to the output signal of the drive motor, and its output terminal outputs the signal when the drive motor rotates to the correct position, and illuminates the extension status indicator light.

3. The electric actuator limit switch signal feedback system according to claim 2, characterized in that, The first circuit also includes a second branch, which includes a second resistor and a second optocoupler. The input terminal of the second optocoupler is connected to the output signal of the drive motor, and its output terminal outputs the signal when the drive motor reverses to the correct position, and illuminates the retraction status indicator.

4. The electric actuator limit switch signal feedback system according to claim 3, characterized in that, The first circuit also includes a reserved pin that connects to the second end of the second optocoupler.

5. The electric actuator limit switch signal feedback system according to claim 4, characterized in that, The reserved pins are connected to the filter protector.

6. The electric actuator limit switch signal feedback system according to claim 4, characterized in that, The reserved pins are connected to the overcurrent protector.

7. A signal feedback system for an electric actuator limit switch according to any one of claims 1-6, characterized in that, The second circuit includes a third branch, which includes a diode a and a third resistor; the input terminal of the diode a is connected to the output signal of the first optocoupler.

8. The electric actuator limit switch signal feedback system according to claim 7, characterized in that, The second circuit also includes a fourth branch, which includes a diode b and a fourth resistor; the input terminal of the diode b is connected to the output signal of the second optocoupler.

9. The electric actuator limit switch signal feedback system according to claim 7, characterized in that, The extended and retracted status indicator lights are light-emitting diodes.

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