Motor fault detection device

Abstract

The invention provides a motor fault detection device which comprises a proximity switch sensor used for detecting the rotating speed of a motor and outputting a corresponding high-level or low-level signal based on the detected rotating speed; the trigger comprises a positive trigger input end and a negative trigger input end, the positive trigger input end is connected with the proximity switch sensor, and the negative trigger input end is grounded; the trigger correspondingly outputs a high level or a low level according to a level signal output by the proximity switch sensor; one end of the light-emitting diode is connected with the output end of the trigger, and the other end is grounded; when the trigger outputs a high level, the light emitting diode is lightened to indicate a fault state of the motor. Through automatic detection, the running state of the laminar flow roller way motor is monitored in real time, faults are found and processed in time, subjective influences and omissions caused by manual inspection are avoided, and the timeliness and accuracy of fault detection are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a detection device, in particular to a motor fault detection device. BACKGROUND

[0002] Laminar flow roller motors play a vital role in the steel industry, especially in the roller conveyor between the finishing mill and the coiler. These motors are responsible for transferring the cooled steel strip from the finishing mill to the coiler for coiling, and are key equipment in the hot rolling production line, directly affecting product quality, yield and production efficiency. However, due to the harsh environment of the laminar flow roller area, including high humidity and temperature, and the easy overheating of the roller, these motors are in a high-temperature and humid environment for a long time, resulting in a high failure rate and frequent dead roller phenomenon, which seriously affects the surface quality of the strip.

[0003] In such a harsh working environment, the lubricating grease is easily lost or the motor is flooded, which in turn causes the roller to be stuck and the motor to be short-circuited. Damage to the laminar flow roller motor not only leads to a decline in product quality, but also causes huge economic losses to the strip production enterprise. Therefore, timely detection and handling of these faults is crucial to improve the operating efficiency of the steel plate and strip conveying area, reduce damage to other equipment, and reduce the use and operating costs of the motor.

[0004] However, due to the large number of laminar flow roller motors, usually more than 400, and the harsh environment in which they are used, current detection of the motors mainly relies on regular inspections by personnel to determine faults by sight and sound. This method lacks timeliness, is prone to omissions, and is labor-intensive. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide a motor fault detection device that automatically and timely detects faults in laminar flow roller motors to improve production efficiency and reduce economic losses.

[0006] The first aspect of the present disclosure provides a motor fault detection device, comprising a proximity switch sensor for detecting the rotational speed of the motor and outputting a corresponding high or low level signal based on the detected rotational speed; a flip-flop including a positive trigger input and a negative trigger input, wherein the positive trigger input is connected to the proximity switch sensor and the negative trigger input is grounded; the flip-flop outputs a high or low level signal according to the level signal output by the proximity switch sensor; a light-emitting diode connected to the output end of the flip-flop at one end and grounded at the other end; when the flip-flop outputs a high level, the light-emitting diode is lit.

[0007] In an embodiment of the first aspect, further comprising an intermediate relay and an alarm; a coil end of the intermediate relay is connected with an output end of the trigger, and a contact end of the intermediate relay is connected with the alarm; when the output of the trigger is high, the intermediate relay is closed to turn on the alarm to give an alarm.

[0008] In an embodiment of the first aspect, the alarm is an audible and light alarm.

[0009] In an embodiment of the first aspect, the alarm further comprises a manual reset end; the manual reset end is connected with a power supply.

[0010] In an embodiment of the first aspect, further comprising a decoupling diode; one end of the diode is connected with the output end of the trigger, and the other end is connected with the coil end of the intermediate relay.

[0011] In an embodiment of the first aspect, the trigger further comprises an external capacitor end, an external resistance-capacitor common end, and a direct clearing end; wherein the external capacitor end is connected with an adjustable capacitor; the direct clearing end is connected to a power supply; an adjustable resistance is connected between the power supply and the external resistance-capacitor common end; the adjustable capacitor and the adjustable resistance are used to adjust the transient pulse width period of the trigger, so that the transient pulse width period is greater than the rotation period of the motor.

[0012] In an embodiment of the first aspect, the trigger is a 74 or 54 series repeatable trigger monostable trigger.

[0013] In an embodiment of the first aspect, further comprising a current limiting resistance; wherein the light emitting diode is a high brightness LED; the LED is connected with the output end of the trigger through the current limiting resistance, to prevent the LED from being damaged due to overcurrent.

[0014] In an embodiment of the first aspect, the intermediate relay further comprises a holding end; the holding end is connected with a power supply; after the intermediate relay is activated, the holding end keeps the intermediate relay in the activated state until the next output signal of the trigger arrives.

[0015] As described above, the motor fault detection device provided in the embodiments of the present disclosure can monitor the running state of the laminar flow roller motor in real time through automatic detection, discover and handle faults in time, avoid the subjective influence and omissions of manual inspection, and improve the timeliness and accuracy of fault detection. At the same time, the dependence on inspection personnel is reduced, the labor intensity is reduced, and the work efficiency is improved. In addition, timely discovery and handling of faults can reduce quality problems such as strip scratches caused by faults and improve product quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic diagram showing the working of the laminar flow roller motor.

[0017] Figure 2 A schematic diagram showing the motor fault detection device in an embodiment of the present disclosure.

[0018] Figure 3 A schematic diagram showing the connection of the alarm in an embodiment of the present disclosure.

[0019] Figure 4 A schematic diagram showing the structure of the multiple motor fault detection in an embodiment of the present disclosure.

[0020] Element Number Description

[0021] Motor 1

[0022] Proximity switch sensor K

[0023] Flip-flop FF

[0024] Light emitting diode VD

[0025] Diode D

[0026] Adjustable capacitor Ce

[0027] External resistance Re

[0028] Resistance R

[0029] Alarm A DETAILED DESCRIPTION

[0030] The present disclosure will be described with respect to the particular embodiments illustrated herein in detail. The skilled artisan can readily recognize the other advantages and purposes of the present disclosure based on the disclosure contained herein. The present disclosure can be implemented in its embodiments with additional elements or omit certain elements, or some of the elements in the present disclosure can be used in combination with each other to achieve a variety of modifications. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] Although not defined differently, the technical terms and scientific terms used herein include the technical terms and scientific terms used herein, all terms have the same meaning as generally understood by the skilled person in the technical field to which the present disclosure belongs. The terms defined in the commonly used dictionary are additionally explained to have a meaning consistent with the relevant technical literature and the currently disclosed information, and should not be interpreted as an ideal or very formal meaning unless defined.

[0032] In the laminar flow roller system in the steel industry, the motor is a crucial component, which is responsible for transporting the cooled strip from the finishing mill to the coiler, such as Figure 1The working schematic diagram of the laminar flow roller motor is shown. Since the working environment is poor, the failure rate of the motor is high, and therefore it is crucial to monitor the running state of the motor in real time. In order to achieve this purpose, the motor fault detection device is disclosed, which objectively detects the running fault of the laminar flow roller motor, realizes the timely discovery and elimination of the fault, and avoids the further development of the fault to cause serious influence and greater economic loss.

[0033] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.

[0034] As Figure 2 The schematic diagram of the motor fault detection device in the present application is shown, which includes a proximity switch sensor K, a flip-flop FF and a light-emitting diode VD.

[0035] The proximity switch sensor K is used to detect the rotating speed of the motor 1 and output corresponding high or low level signals based on the detected rotating speed.

[0036] The flip-flop FF includes a positive trigger input end and a negative trigger input end, wherein the positive trigger input end is connected to the proximity switch sensor K, and the negative trigger input end is grounded; the flip-flop FF outputs high or low level signals according to the level signals output by the proximity switch sensor K.

[0037] The light-emitting diode VD has one end connected to the output end of the flip-flop FF and the other end grounded; when the flip-flop FF outputs high level, the light-emitting diode VD is lit.

[0038] Specifically, metal monitoring points are installed on the rotating part of each laminar flow roller motor 1. These metal monitoring points can be mechanical protrusions, metal sheets or other forms of metal components, which serve as trigger points for sensor detection. The positions of these monitoring points are carefully designed to ensure that they can periodically approach the proximity switch sensor K installed on the bracket of the motor 1 when the motor 1 is running normally.

[0039] The proximity switch sensor K is capable of detecting the distance between the metal monitoring point and itself. When the metal monitoring point approaches the sensor, the proximity switch sensor K outputs a pulse signal, which indicates that the motor 1 is running normally. The pulse signal is sent to the flip-flop FF, which outputs a high or low level according to the signals. If the motor 1 rotates normally, the interval time of the pulse signals will meet the expected periodicity, and the flip-flop FF will continuously output a low level signal. However, if the motor 1 rotates at a low speed or stops rotating, the interval time of the pulse signals output by the proximity switch sensor will exceed the expected periodicity, and the flip-flop FF will output a high level signal. The high level signal is connected through a circuit to light up the light emitting diode VD, which sends an alarm signal to the operator to indicate that the motor 1 may have a fault.

[0040] In principle, the flip-flop FF also includes an external capacitor terminal, an external resistance capacitor common terminal, and a direct clear terminal. These terminals are designed to provide fine-grained control over the performance of the flip-flop FF.

[0041] Specifically, the external capacitor terminal is connected to an adjustable capacitor Ce. The capacitance value of the adjustable capacitor Ce can be adjusted within a certain range by a manual or electric adjustment mechanism. In the flip-flop FF circuit, the adjustable capacitor Ce and the external resistance Re together determine the transient pulse width period of the flip-flop FF. The external resistance capacitor common terminal is connected between the power supply and the external resistance Re, making it possible to control the transient pulse width period of the flip-flop FF by adjusting the value of the external resistance Re. When the power supply voltage and the value of the external resistance Re are determined, the value of the adjustable capacitor Ce can be adjusted manually or electrically to achieve the desired transient pulse width period.

[0042] To achieve the purpose of the present application, the value of the external resistance and the value of the adjustable capacitor are adjusted so that the transient pulse width period of the flip-flop FF is greater than the rotation period of the motor 1. When the motor 1 is running normally, the interval between the pulse signals output by the proximity switch sensor K is very short, which makes the transient pulse width period of the flip-flop FF not reach before the pulse signal is received again. Therefore, the output terminal of the flip-flop FF always remains at a low level, and the light emitting diode VD does not light up, indicating that the motor 1 is in a normal operating state. When the motor 1 rotates at a low speed or stops rotating, the interval between the pulse signals output by the proximity switch sensor K will exceed the transient delay time of the flip-flop FF. This means that no pulse signal is received again within the transient delay time of the flip-flop FF. Therefore, the output terminal of the flip-flop FF will jump from a low level to a high level, causing the light emitting diode VD to light up and prompting the operator that the motor 1 may have a fault.

[0043] Through this design, the motor 1 fault detection device can accurately identify the normal operation and fault state of the motor 1. It not only improves the accuracy of fault detection, but also ensures the stability and continuity of the production process.

[0044] Further, the direct clear end of the flip-flop FF is connected to the power supply. When it is necessary to clear the state of the flip-flop FF, a high-level signal can be directly applied to the direct clear end, and the flip-flop FF will immediately output a low-level signal and return to the initial state. This design can avoid false alarms caused by long-time high-level output.

[0045] Illustratively, the flip-flop FF is a 74 or 54 series repeatable monostable trigger FF.

[0046] In some embodiments, the motor 1 fault detection device further comprises a resistor R, one end of which is connected to the positive trigger input end of the flip-flop FF, and the other end is grounded. The purpose of this design is that when the proximity switch sensor K is disconnected due to some reason (such as mechanical failure, electrical failure or external interference), the resistor R can play a protective role to prevent the positive trigger input end of the flip-flop FF from being suspended.

[0047] In the circuit, a suspended input end may cause signal interference or noise amplification, resulting in false triggering or damage. By connecting a resistor R to the positive trigger input end of the flip-flop FF and grounding it, a low-impedance loop can be formed to effectively absorb the interference signals that may be generated, thereby protecting the flip-flop FF from damage. When the proximity switch sensor K is disconnected, due to the presence of the resistor R, the positive trigger input end will not be suspended, but will form a stable connection between the ground. In addition, this design also improves the anti-interference ability of the circuit and enhances the stability of the system.

[0048] In some embodiments, in order to more effectively prompt the staff that the motor 1 has failed, the motor fault detection device further comprises an alarm A and an intermediate relay J, as shown in Figure 3 , which is an electronic device added on the basis of Figure 2 .

[0049] Illustratively, the alarm A can be an audible and visual alarm A, which can emit sound and / or flashing light to attract the attention of the operator when the motor 1 fails. The audible and visual alarm A usually includes a buzzer and an LED light. When the flip-flop FF outputs a high level, the intermediate relay J is closed, thereby turning on the power supply of the audible and visual alarm A and making it start working to emit sound and light signals.

[0050] The intermediate relay J is responsible for amplifying the output signal of the flip-flop FF and transmitting it to the alarm A. The coil end of the intermediate relay J is connected to the output end of the flip-flop FF, while its contact end is connected to the alarm A. When the flip-flop FF outputs a high level, the intermediate relay J is activated, and its contact is closed, thereby connecting the power supply to the alarm A, enabling it to issue an alarm.

[0051] This design enables the motor 1 fault detection device to prompt the operator visually and aurally that the motor 1 may have a fault. When the motor 1 speed decreases or stops rotating, the operator can quickly identify the possible fault of the motor 1 by hearing the alarm sound or seeing the flashing light, and take appropriate measures to handle it.

[0052] Furthermore, the alarm A also includes a manual reset end connected to the power supply.

[0053] Specifically, when the motor fault detection device detects a fault in the motor 1, the alarm A starts working and issues a sound and light alarm. The operator will receive the alarm and take measures to troubleshoot and repair the fault. Once the fault is eliminated, the operator needs to stop the alarm A from working in order to restore the normal working environment. At this time, the operator can use the manual reset end of the alarm A to achieve this function. The manual reset end is usually a physical button or switch, and the operator only needs to press or operate the button / switch to reset the alarm A.

[0054] The design of the manual reset end connected to the power supply is to ensure that there is no misoperation or power supply short circuit during the reset process. When the operator presses the manual reset end, the alarm A will be disconnected from the power supply, thereby stopping working and stopping issuing sound and light alarms.

[0055] In some embodiments, the intermediate relay J also has a holding end connected to the power supply. When the holding end receives power supply from the power supply, it can ensure that the intermediate relay J remains in the activated state. In the motor fault detection device, the main function of the intermediate relay J is to transmit the output signal of the flip-flop FF to the alarm A, so as to timely issue a sound and light alarm when the motor 1 has a fault.

[0056] When the flip-flop FF outputs a high level, the intermediate relay J is activated, and its contact is closed, thereby starting the alarm A to work and issue a sound and light alarm. Once the intermediate relay J is activated, even if the output signal of the flip-flop FF disappears, the intermediate relay J can continue to remain in the activated state until the next output signal of the flip-flop FF arrives.

[0057] The advantage of this design is that even if the output signal of the flip-flop FF disappears briefly, the intermediate relay J can still remain in the active state, allowing the alarm A to continue to work and issue sound and light warnings to remind the operator that the motor 1 may have a fault. Such a design ensures that the operator will not miss the alarm before troubleshooting, thereby improving the efficiency of fault handling.

[0058] In some embodiments, the motor fault detection device further comprises a decoupling diode D. One end of the decoupling diode D is connected to the output of the flip-flop FF. When the flip-flop FF outputs a high level, the other end of the decoupling diode D is connected to the coil end of the intermediate relay J.

[0059] Due to the presence of noise and interference in the circuit, these noise and interference may affect the operation of the flip-flop FF and the intermediate relay J, resulting in a decrease in the performance of the fault detection device. The role of the decoupling diode D is to remove these noise and interference, ensuring the stability and reliability of the circuit. When the flip-flop FF outputs a high level, the decoupling diode D will be turned on, forming a low-impedance path to transfer noise and interference from the output of the flip-flop FF to the coil end of the intermediate relay J. Due to the conduction of the decoupling diode D, these noise and interference are effectively removed, thereby ensuring the stability and reliability of the circuit.

[0060] In some embodiments, the motor fault detection device further comprises a current limiting resistor; wherein the light emitting diode VD is a high brightness LED; the LED is connected to the output of the flip-flop FF through the current limiting resistor, for preventing the LED from being damaged due to overcurrent.

[0061] Specifically, the light emitting diode VD (LED) is a semiconductor device that can convert electrical energy into optical energy. If the current through the LED is too large, it may cause the LED to overheat, damage or even burn out. To avoid this situation, a current limiting resistor is introduced in the design. This resistor is connected in series between the LED and the output of the flip-flop FF, which limits the current through the LED so that it does not exceed the rated current of the LED. When the flip-flop FF outputs a high level, the current will flow into the LED through the current limiting resistor, but due to the presence of the resistor, the current through the LED will be limited to below the rated current of the LED. In this way, even if the current output by the flip-flop FF is large, the LED will not be damaged due to overcurrent.

[0062] In some embodiments, to avoid false alarms of the laminar roller motor 1 during start-up and shutdown, a switch control mechanism is designed in the present disclosure, which automatically switches the working state of the device when the roller conveyor starts and stops.

[0063] Specifically, this device automatically opens when the roller conveyor has finished starting and entered normal operation. At this time, the trigger FF starts working, monitoring the speed of motor 1 through proximity switch sensor K and outputting a corresponding level signal according to the speed. If motor 1 malfunctions, the trigger FF will output a high-level signal, the intermediate relay J will close, and the alarm A will start working, emitting an audible and visual alarm.

[0064] However, during startup and shutdown, the speed of motor 1 may fluctuate, causing trigger FF to output a high-level signal, even if motor 1 is not actually faulty. To avoid this, the device remains off during startup and shutdown, and is only turned on after motor 1 has entered normal operating condition. Similarly, the device is automatically disconnected just before the roller conveyor stops running. This prevents the device from remaining active after motor 1 has stopped, thus avoiding false alarms. After the device is disconnected, intermediate relay J and alarm A stop working, and the system returns to normal.

[0065] In practical applications, such as Figure 4 As shown, the laminar flow roller motors typically exist in multiple forms, each connected to a trigger FF. The outputs of all trigger FFs are decoupled by diode D and connected to the same intermediate relay J. Whenever any laminar flow roller motor detects a negative pulse and outputs a high-level signal (i.e., trigger FF outputs a high-level signal), the intermediate relay J closes, its contacts powering the audible and visual alarm A, triggering an audible and visual alarm.

[0066] In summary, this disclosure provides a motor fault detection device that can accurately monitor the operating status of laminar flow roller conveyor motors, enabling timely fault detection and elimination. This prevents faults from escalating and causing serious impacts and greater economic losses, avoids the subjective influence, high costs, and time associated with manual inspections, reduces maintenance costs for laminar flow roller conveyor motors, minimizes equipment maintenance work, and improves the working efficiency of laminar flow roller conveyor motors. Furthermore, it improves the accuracy of fault detection, reduces false alarms, and ensures the stability and continuity of the production process. Simultaneously, this design allows the motor fault detection device to adapt to different motor speed requirements, improving its applicability and flexibility.

[0067] The above embodiments are merely illustrative of the principles and effects of this disclosure and are not intended to limit this disclosure. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this disclosure. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this disclosure should still be covered by the claims of this disclosure.

Claims

1. An electric motor fault detection apparatus, characterized by, The application relates to a motor fault indicator. The application comprises: a proximity switch sensor for detecting the rotating speed of a motor and outputting a corresponding high or low level signal based on the detected rotating speed; a flip-flop comprising a positive trigger input end and a negative trigger input end, wherein the positive trigger input end is connected to the proximity switch sensor and the negative trigger input end is grounded; the flip-flop outputs a high or low level signal according to the level signal outputted by the proximity switch sensor; 2. The motor fault detection apparatus of claim 1, wherein a light-emitting diode (LED) having one end connected to the output end of the flip-flop and the other end grounded; when the flip-flop outputs a high level signal, the LED is lighted to indicate the fault state of the motor. The application further comprises an intermediate relay and an alarm; 3. The motor fault detection apparatus of claim 2, wherein the coil end of the intermediate relay is connected to the output end of the flip-flop, and the contact end of the intermediate relay is connected to the alarm; when the flip-flop outputs a high level signal, the intermediate relay is closed to turn on the alarm to give an alarm.

4. The motor fault detection apparatus of claim 2, wherein The alarm is an audible and light alarm.

5. The motor fault detection apparatus of claim 2, wherein The alarm further comprises a manual reset end; the manual reset end is connected to a power supply.

6. The motor fault detection apparatus of claim 1, wherein The application further comprises a decoupling diode; one end of the diode is connected to the output end of the flip-flop and the other end is connected to the coil end of the intermediate relay.

7. The motor fault detection apparatus of claim 1, wherein The flip-flop further comprises an external capacitor end, an external resistance and capacitor common end and a direct clear end; wherein the external capacitor end is connected to an adjustable capacitor; the direct clear end is connected to a power supply; an adjustable resistance is connected between the power supply and the external resistance and capacitor common end; the adjustable capacitor and the adjustable resistance are used for adjusting the transient pulse width period of the flip-flop, so that the transient pulse width period is greater than the rotating period of the motor.

8. The motor fault detection apparatus of claim 1, wherein The application further comprises a resistance; one end of the resistance is connected to the positive trigger input end of the flip-flop and the other end is grounded.

9. The motor fault detection apparatus of claim 1, wherein The flip-flop is a 74 or 54 series repeatable flip-flop monostable trigger.

10. The motor fault detection apparatus of claim 2, wherein The application further comprises a current limiting resistance; wherein the LED is a high brightness LED; the LED is connected to the output end of the flip-flop through the current limiting resistance, so as to prevent the LED from being damaged due to overcurrent. The intermediate relay further comprises a holding end; the holding end is connected to a power supply; after the intermediate relay is activated, the holding end keeps the intermediate relay in the activated state until the next output signal of the flip-flop arrives.

Images