A kind of automatic back-off protection structure of meeting resistance for roller shutter door motor

Abstract

The utility model relates to a roller shutter door motor technology field discloses a kind of automatic backoff protection structures of resistance encountered for roller shutter door motor, including motor body, torque monitoring module, execution module and safety alarm module;Motor body is connected with the reel of roller shutter door by transmission mechanism, for driving the lifting of roller shutter door;Torque monitoring module is installed on transmission mechanism, for real-time monitoring the torque change of motor output shaft;Execution module includes controller and backoff driving device, controller is electrically connected with torque sensor, for receiving the torque signal transmitted by torque sensor, and sends control signal to backoff driving device, controls backoff driving device and drives motor reverse rotation, makes roller shutter door backoff certain distance.The device improves the safety and reliability of roller shutter door motor, avoids motor overload damage and possible safety accident.

Description

Technical Field

[0001] This utility model relates to the field of roller shutter door motor technology, specifically to an automatic retraction protection structure for roller shutter door motors when encountering obstacles. Background Technology

[0002] Roller shutters are widely used in daily life and commercial spaces, making the reliability and safety of their motors crucial. However, traditional roller shutter motors often fail to react promptly to obstructions during operation, easily leading to motor overload and damage, and potentially even causing safety accidents.

[0003] Existing roller shutter door motors mostly use limit switches or infrared sensors to achieve the anti-pinch function, but they have the following drawbacks: contact sensors are prone to failure due to mechanical wear, non-contact sensors have a high false alarm rate in strong light / dust environments, cannot distinguish between normal load and obstacle resistance, and response delays lead to the risk of secondary injury. Utility Model Content

[0004] In view of this, the present invention provides an automatic retraction protection structure for a roller shutter door motor to solve the technical problems in the prior art, such as the failure of contact sensors due to mechanical wear, the high false alarm rate of non-contact sensors in strong light / dust environments, the inability to distinguish between normal load and obstacle resistance, and the risk of secondary injury due to response delay.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It mainly provides an automatic retraction protection structure for a roller shutter door motor, which mainly includes: a motor body, a torque monitoring module, an execution module, and a safety alarm module.

[0006] The motor body is connected to the roller shaft of the roller shutter door through a transmission mechanism, and is used to drive the roller shutter door to rise and fall; The torque monitoring module includes a torque sensor, which is mounted on the transmission mechanism to monitor the torque changes of the motor output shaft in real time. The execution module includes a controller and a reversing drive device. The controller is electrically connected to a torque sensor to receive the torque signal transmitted by the sensor and sends a control signal to the reversing drive device when the torque signal is abnormal. The reversing drive device is connected to the motor body, and the controller can control the reversing drive device to drive the motor to rotate in the opposite direction, causing the roller shutter door to retract a certain distance, thereby achieving automatic reversing protection upon encountering an obstacle. The safety alarm module includes an audible and visual alarm device, which is electrically connected to the controller and is used to trigger an audible and visual alarm based on the controller's control signals.

[0007] As a further embodiment of this utility model: the transmission mechanism includes a gear set and a coupling. The output shaft of the motor body is connected to the gear set through the coupling, and the gear set is then connected to the roller shutter door's roller shaft to realize the power transmission between the motor and the roller shutter door's roller shaft.

[0008] As a further aspect of this invention, the torque sensor is a strain gauge torque sensor, which calculates the torque by measuring the strain of the drive shaft.

[0009] As a further embodiment of this utility model: the safety alarm module includes an audible and visual alarm device, which is electrically connected to the controller and is used to provide audible and visual alarms according to the control signal of the controller. The execution module also includes a filter amplifier circuit. When the motor encounters an obstacle, the controller controls the alarm device to issue an audible and visual alarm signal to remind the user to handle it in time. The filter amplifier circuit is used to filter and amplify the detected torque signal. The input terminal of the filter amplifier circuit is electrically connected to the output terminal of the torque sensor, and the output terminal of the filter amplifier circuit is electrically connected to the signal input terminal of the controller. The filter amplifier circuit consists of a first-stage amplifier circuit, a second-stage amplifier circuit, and a filter circuit. The audible and visual alarm device includes a 555 timer chip, a speaker A1, an LED D0, resistors Rn1, Rn2, and Rn3, and capacitors Cn1 and Cn2. The fifth pin of the 555 timer chip is connected to the positive terminal of LED D0 and one end of resistor Rn1. The negative terminal of LED D0 is grounded. The other end of resistor Rn1 is electrically connected to the signal output terminal of the controller. The sixth pin of the 555 timer chip is connected to one end of resistor Rn2, one end of capacitor Cn1, and the second pin of the 555 timer chip. The seventh pin of the 555 timer chip is connected to the other end of resistor Rn2 and one end of resistor Rn3. The other end of resistor Rn3 is connected to the power supply. The third pin of the 555 timer chip is connected to one end of capacitor Cn2. The other end of capacitor Cn2 is connected to one end of speaker A1. The other end of speaker A1 is grounded.

[0010] As a further embodiment of this utility model: the retraction drive device includes an electromagnetic brake and a motor driver; the electromagnetic brake maintains a braking state during normal operation and releases during retraction; the motor driver drives the motor to rotate in the opposite direction under the control of the controller.

[0011] As a further aspect of this invention, it also includes a temperature detection module, which includes a temperature sensor. The temperature sensor is used to monitor the temperature of the motor windings in real time. The temperature sensor is electrically connected to the controller and is an NTC thermistor.

[0012] As can be seen from the above technical solution, the main advantages of this utility model include: This invention provides an automatic retraction protection system with millisecond-level response, achieved by real-time monitoring of changes in the motor output shaft torque to identify obstacles. The alarm device emits audible and visual alarm signals upon encountering an obstruction, alerting the user and further enhancing the safety of the roller shutter door. Furthermore, the controller can reverse the motor upon encountering an obstruction, ensuring rapid retraction and effectively preventing motor malfunctions. It also avoids false infrared detection, effectively protecting both equipment and personnel safety. Attached Figure Description

[0013] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the composition structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the circuit structure of the audible and visual alarm device and the filter amplification circuit in this embodiment. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] This embodiment provides a fast-responding, highly sensitive, and more secure and precise automatic retraction protection structure for roller shutter door motors when encountering obstacles. For example... Figure 1 and Figure 2 As shown, the automatic retraction protection structure for the roller shutter door motor is composed of multiple key modules working together, closely connected to each other. Specifically, it includes: a motor body, a torque monitoring module, an execution module, a safety alarm module, and a temperature detection module. The motor body is connected to the roller shutter door's shaft via a transmission mechanism to drive the door's lifting and lowering. The transmission mechanism includes a gear set and a coupling. The motor body's output shaft is connected to the gear set via the coupling, and the gear set is then connected to the roller shutter door's shaft, realizing power transmission between the motor and the roller shutter door's shaft. The torque monitoring module includes a torque sensor mounted on the transmission mechanism to monitor the torque changes of the motor's output shaft in real time. In this embodiment, the torque sensor is a strain gauge torque sensor, which calculates the torque by measuring the strain of the transmission shaft, featuring high accuracy and fast response. The temperature detection module includes a temperature sensor mounted on the motor body to monitor the temperature of the motor windings in real time. The temperature sensor is electrically connected to the controller and uses an NTC thermistor. When the temperature is abnormal, the controller forces the motor to stop and triggers an alarm to prevent the motor from burning out.

[0017] The execution module includes a controller and a reversing drive device. The controller is electrically connected to a torque sensor to receive the torque signal transmitted by the sensor. When the torque signal is abnormal, the controller sends a control signal to the reversing drive device, controlling the motor of the reversing drive device to rotate in the opposite direction, causing the roller shutter door to retract a certain distance, thereby achieving automatic reversing protection upon encountering an obstacle. The reversing drive device is mounted on the motor body. The reversing drive device includes an electromagnetic brake and a motor driver. The electromagnetic brake maintains a braking state during normal operation and releases during reversal. The motor driver drives the motor to rotate in the opposite direction under the control of the controller.

[0018] Specifically, the safety alarm module includes an audible and visual alarm device, which is electrically connected to the controller and is used to trigger an audible and visual alarm based on the controller's control signals. The controller and the audible and visual alarm device are mounted on the protective housing of the roller shutter door motor. The execution module also includes a filtering and amplification circuit. When the motor encounters an obstruction, the controller activates the alarm device to emit an audible and visual alarm signal to remind the user to take timely action. The filtering and amplification circuit filters and amplifies the detected torque signal before transmitting it to the controller.

[0019] like Figure 2 As shown, the audible and visual alarm device includes a 555 timer chip, a speaker A1, an LED D0, resistors Rn1, Rn2, and Rn3, and capacitors Cn1 and Cn2. The fifth pin of the 555 timer chip is connected to the positive terminal of the LED D0 and one end of the resistor Rn1. The negative terminal of the LED D0 is grounded. The other end of the resistor Rn1 is electrically connected to the signal output terminal of the controller. The sixth pin of the 555 timer chip is connected to one end of the resistor Rn2, one end of the capacitor Cn1, and the second pin of the 555 timer chip. The seventh pin of the 555 timer chip is connected to the other end of the resistor Rn2 and one end of the resistor Rn3. The other end of the resistor Rn3 is connected to the power supply. The third pin of the 555 timer chip is connected to one end of the capacitor Cn2. The other end of the capacitor Cn2 is connected to one end of the speaker A1. The other end of the speaker A1 is grounded.

[0020] The input terminal of the filter amplifier circuit is electrically connected to the output terminal of the torque sensor, and the output terminal of the filter amplifier circuit is electrically connected to the signal input terminal of the controller. The filter amplifier circuit consists of a first-stage amplifier circuit, a second-stage amplifier circuit, and a filter circuit. The amplifier circuit adopts a two-stage amplification design. The first stage is a low-noise operational amplifier circuit, used to initially amplify the weak signal output by the torque sensor. The second stage is a high-gain operational amplifier, used to further amplify the signal to a suitable amplitude for subsequent processing. The filter circuit adopts a second-order low-pass filter design to remove high-frequency noise and improve signal stability. The first-stage amplifier circuit includes resistors R1, R2, R3, and R4, capacitors C1 and C2, and operational amplifier U1. One end of resistor R1 is connected to the positive terminal of the power supply +Vcc, and the other end of resistor R1 is connected to the inverting input terminal of operational amplifier U1. One end of resistor R2 is connected to power ground (GND), and the other end is connected to the inverting input of operational amplifier U1. One end of resistor R3 is connected to the inverting input of operational amplifier U1, and the other end is connected to the output of operational amplifier U1. One end of capacitor C2 is connected to the output of operational amplifier U1, and the other end is connected to power ground (GND). The second-stage amplifier circuit includes resistors R5, R6, R7, and R8, capacitors C3 and C4, and operational amplifier U2. One end of resistor R5 is connected to the output of operational amplifier U1, and the other end is connected to the inverting input of operational amplifier U2. One end of resistor R6 is connected to power ground (GND), and the other end is connected to the inverting input of operational amplifier U2. One end of resistor R7 is connected to the inverting input of operational amplifier U2, and the other end is connected to the output of operational amplifier U2. One end of capacitor C4 is connected to the output of operational amplifier U2, and the other end is connected to power ground (GND). The filter circuit includes resistors R9, R10, and R11, and capacitors... C5, capacitor C6, and operational amplifier U3; one end of resistor R9 is connected to the output of operational amplifier U2, and the other end is connected to the inverting input of operational amplifier U3; one end of resistor R10 is connected to power ground (GND), and the other end is connected to the inverting input of operational amplifier U3; one end of resistor R11 is connected to the inverting input of operational amplifier U3, and the other end is connected to the output of operational amplifier U3; one end of capacitor C5 is connected to the output of operational amplifier OPA237, and the other end is connected to the non-inverting input of operational amplifier U3; one end of capacitor C6 is connected to the output of operational amplifier U3, and the other end is connected to power ground (GND). Operational amplifier U1 uses OPA234, operational amplifier U2 uses OPA237, and operational amplifier U3 uses OPA234. Specifically, R1, R2, R3, and R4 are used to set the amplification factor.C1, C2, C3, and C4 are coupling capacitors used to remove DC components and prevent signal distortion.

[0021] The working process for this application is as follows: During the operation of the roller shutter door, the motor body drives the roller shutter door to rise and fall through the transmission mechanism. A torque sensor monitors the torque changes of the motor output shaft in real time and transmits the signal to a filtering and amplification circuit. This circuit filters and amplifies the torque signal before transmitting it to the controller. The controller receives the processed torque signal. When the torque sensor detects an abnormal torque (such as the motor encountering an obstacle), the controller receives the abnormal signal and sends a control signal to the reversing drive device. The electromagnetic brake in the reversing drive device is released, and the motor driver, under the control of the controller, drives the motor to rotate in the opposite direction, causing the roller shutter door to retract a certain distance. This achieves automatic reversal protection when encountering an obstacle. Furthermore, when the motor encounters an obstacle, the controller activates an audible and visual alarm to alert the user. A temperature sensor monitors the temperature of the motor windings in real time and transmits the temperature signal to the controller. When the motor windings overheat, the controller forces the motor to stop and triggers an alarm to prevent the motor from burning out.

[0022] By monitoring the torque changes of the motor output shaft in real time through a torque sensor, the system can accurately determine whether the motor is encountering an obstruction, thus improving the safety and reliability of the roller shutter motor. When the motor encounters an obstruction, the reversing drive device can promptly drive the motor to rotate in the opposite direction, causing the roller shutter to retract a certain distance, avoiding motor overload damage and potential safety accidents. The controller can be flexibly adjusted according to preset torque thresholds to adapt to the needs of different roller shutter systems. The alarm device can emit audible and visual alarm signals when an obstruction is encountered, reminding the user to take timely action, further improving the safety of using the roller shutter.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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. An automatic retraction protection structure for a roller shutter door motor, characterized in that, include: Motor body, torque monitoring module, execution module and safety alarm module; The motor body is connected to the roller shaft of the roller shutter door through a transmission mechanism, and is used to drive the roller shutter door to rise and fall; The torque monitoring module includes a torque sensor, which is mounted on the transmission mechanism and is used to monitor the torque change of the motor output shaft in real time. The execution module includes a controller and a retraction drive device. The controller is electrically connected to the torque sensor and is used to receive the torque signal transmitted by the torque sensor and send a control signal to the retraction drive device to control the retraction drive device to drive the motor to rotate in the opposite direction, so that the roller shutter door retracts a certain distance. The safety alarm module includes an audible and visual alarm device, which is electrically connected to the controller and is used to trigger an audible and visual alarm based on the controller's control signals.

2. The automatic retraction protection structure for roller shutter door motors according to claim 1, characterized in that, The transmission mechanism includes a gear set and a coupling. The output shaft of the motor body is connected to the gear set through the coupling, and the gear set is then connected to the roller shaft of the roller shutter door.

3. The automatic retraction protection structure for roller shutter door motors according to claim 1, characterized in that, The torque sensor is a strain gauge torque sensor.

4. The automatic retraction protection structure for roller shutter door motors according to claim 3, characterized in that, The execution module further includes a filter amplifier circuit; the input terminal of the filter amplifier circuit is electrically connected to the output terminal of the torque sensor, and the output terminal of the filter amplifier circuit is electrically connected to the signal input terminal of the controller.

5. The automatic retraction protection structure for roller shutter door motors according to claim 1, characterized in that, The audible and visual alarm device includes a 555 timer chip, a speaker A1, a light-emitting diode D0, resistors Rn1, Rn2, and Rn3, and capacitors Cn1 and Cn2. The fifth pin of the 555 timer chip is connected to the positive terminal of the light-emitting diode D0 and one end of resistor Rn1. The negative terminal of the light-emitting diode D0 is grounded. The other end of resistor Rn1 is electrically connected to the signal output terminal of the controller. The sixth pin of the 555 timer chip is connected to one end of resistor Rn2, one end of capacitor Cn1, and the second pin of the 555 timer chip. The seventh pin of the 555 timer chip is connected to the other end of resistor Rn2 and one end of resistor Rn3. The other end of resistor Rn3 is connected to a power supply. The third pin of the 555 timer chip is connected to one end of capacitor Cn2. The other end of capacitor Cn2 is connected to one end of speaker A1, and the other end of speaker A1 is grounded.

6. The automatic retraction protection structure for a roller shutter door motor according to claim 1, characterized in that, The retraction drive device includes an electromagnetic brake and a motor driver; the electromagnetic brake maintains a braking state during normal operation and releases during retraction; the motor driver drives the motor to rotate in the opposite direction under the control of the controller.

7. The automatic retraction protection structure for a roller shutter door motor according to claim 1, characterized in that, It also includes a temperature detection module, which includes a temperature sensor for real-time monitoring of the temperature of the motor windings. The temperature sensor is electrically connected to the controller.

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