CN111188169A - Motor abnormal condition detection module, detection method, abnormal condition reminding system and clothes drying system - Google Patents

Abstract

The invention discloses a motor abnormal condition detection module, a detection method, an abnormal condition reminding system and a clothes drying system, wherein the abnormal condition reminding system comprises an MCU (microprogrammed control Unit) controller, a lifting motor, a motor rotating speed detection module, a motor overheating protection module and a reminding module; the motor rotating speed detection module is used for sensing the rotation of the lifting motor, and the MCU controller detects the rotating speed of the motor and performs multi-stage judgment by receiving and processing a rotating signal sent by the motor rotating speed detection module so as to judge whether the motor is in an overweight state or an overheated state; the motor overheating protection module is used for cutting off a power supply when the working temperature of the lifting motor exceeds a threshold value, and the reminding module sends a reminding signal that the lifting motor is in an overweight state or an overheated state to a user according to an instruction sent by the MCU controller.

Description

Motor abnormal condition detection module, detection method, abnormal condition reminding system and clothes drying system

Technical Field

The invention relates to a motor condition detection method of a clothes drying machine, in particular to a clothes drying machine motor abnormal condition detection module, a detection method and a clothes drying machine abnormal condition reminding system.

Background

The clothes airing machine comprises a main machine part and a clothes airing rack, wherein the main machine part is installed on a ceiling, the clothes airing rack is located below the main machine part, a power assembly in the main machine part is used for winding and unwinding a steel wire rope, and the main machine part is connected with the clothes airing rack through the steel wire rope so as to achieve lifting of the clothes airing rack.

The power assembly comprises a motor, a winding drum, a line pressing component and the like, wherein the motor rotates forwards and backwards to drive the winding drum to enable a steel wire rope on the winding drum to be wound and unwound so as to realize the lifting of the clothes hanger.

The clothes airing machine overweight detection system and overweight protection system among the prior art, wherein the content is: when the airing rod rises, the rotating speed of the motor is detected, and when the rotating speed of the motor is smaller than a set threshold value, the motor is judged to be in overweight running. For example, the normal upward motor rotation speed is 2800rpm, and when the upward motor rotation speed is greatly reduced, for example, 1400rpm, it is determined that the motor is overweight.

The motor overweight detection method is characterized in that on the premise that the default motor has enough torque and can drive the airing rod; when the torque of the motor is insufficient and the airing rod is difficult to drive to move upwards, the condition of the motor can be divided into an overweight state or an overheat state, and a user cannot easily take different countermeasures according to different states in the actual use process.

Disclosure of Invention

The invention aims to solve the technical problem of providing a motor abnormal condition detection module and a detection method of a clothes airing machine, wherein when a lifting motor cannot drive an airing rod to move upwards, the lifting motor is detected to be in an overweight state or an overheat protection state; the special condition reminding system of the clothes airing machine and the clothes airing system with the special condition reminding system are further provided to remind a user that the clothes airing machine is in an overweight or overheated state, so that the user can take different countermeasures conveniently.

The technical scheme adopted by the invention for solving the technical problems is as follows: the abnormal condition reminding system is used in the clothes airing machine and comprises an MCU controller, a lifting motor, a motor rotating speed detection module, a motor overheating protection module and a reminding module, wherein the MCU controller is respectively connected with the lifting motor, the motor rotating speed detection module and the reminding module, and receives and processes a rotating signal detected by the rotating speed detection module; the motor overheating protection module is connected with the lifting motor and used for cutting off a power supply when the working temperature of the lifting motor exceeds a threshold value; the reminding module sends out a reminding signal that the lifting motor is in an overweight state or an overheated state to a user according to an instruction sent by the MCU controller.

The further optimized scheme of the invention is that the motor rotating speed detection module comprises a magnetic element and a Hall sensor or a magnetic-sensitive sensor which are arranged on the rotating shaft of the lifting motor so as to detect the rotating signal of the lifting motor.

The further optimization scheme of the invention is that the MCU controller receives and processes the rotation signal to obtain the rotation speed data of the lifting motor.

According to a further optimized scheme of the invention, the lifting motor drives the airing rod to lift, and the MCU controller receives and processes the rotation signal to obtain the lifting stroke data of the airing rod.

According to a further optimized scheme of the invention, the motor overheating protection module comprises a temperature controller, and when the temperature of the lifting motor exceeds a threshold value, the temperature controller cuts off a power supply of the lifting motor.

According to a further optimized scheme of the invention, the motor overheating protection module comprises a temperature sensor for detecting a temperature signal of the lifting motor.

The further optimization scheme of the invention is that the MCU controller receives and processes the temperature signal of the lifting motor, and when the temperature of the lifting motor exceeds a threshold value, the power supply of the lifting motor is disconnected through the electronic switch.

The invention further optimizes the scheme that the reminding module is a display screen for displaying reminding information or a sound-producing element for playing reminding sound.

The further optimized scheme of the invention is that the MCU controller controls the lifting of the lifting motor through an electronic switch.

Another subject of the invention is: the clothes drying system comprises the abnormal condition reminding system.

Another subject of the invention is: the motor abnormal condition detection module is used in the clothes airing machine and comprises an MCU (microprogrammed control Unit) controller, a lifting motor, a motor rotating speed detection module and a motor overheating protection module; the MCU controller is respectively connected with the lifting motor and the motor rotating speed detection module; the MCU controller controls the lifting motor, the motor rotating speed detection module detects a rotating signal of the lifting motor, and the MCU controller receives and processes the rotating signal detected by the rotating speed detection module; the motor overheating protection module is connected with the lifting motor and used for cutting off a power supply when the working temperature of the lifting motor exceeds a threshold value.

Another subject of the invention is: the motor abnormal condition detection method of the clothes drying system comprises the following specific steps;

the MCU controller receives an airing rod ascending instruction, the lifting motor drives the airing rod to ascend, and the rotating speed V1 of the lifting motor is detected;

if the rotating speed V1 of the lifting motor is greater than 0, the lifting motor works normally; if V1 is equal to 0, detecting an airing rod position L1;

if the airing rod position L1 is at a lower limit position, the lifting motor is in an overweight state, the lifting motor stops running and overweight reminding is carried out; if the position L1 of the drying rod is not at the lower limit, the drying rod descends, and the rotating speed V2 of the lifting motor is detected;

if the rotating speed V2 of the lifting motor is equal to 0, the lifting motor is in an overheating state, the operation of the lifting motor is stopped, and overheating reminding is carried out; if V2 is greater than 0, then the elevator motor is in overweight state, and the elevator motor descends to lower limit and is overweight to remind.

Compared with the prior art, the clothes airing machine has the advantages that the motor rotating speed detection module is used for detecting the motor rotating signal, the MCU controller receives and processes the rotating signal to judge whether the clothes airing machine is in an overweight state or an overheated state, sends a corresponding instruction to the reminding module, and sends the reminding signal to a user through the reminding module, so that when the lifting motor stops rotating, the user can quickly distinguish whether the motor is in the overweight state or the overheated state through the reminding signal, takes corresponding measures, and quickly eliminates faults to enable the clothes airing machine to be recovered to be normally used.

Drawings

The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a block diagram of the organization of a preferred embodiment of the present invention;

fig. 2 is a first structural block diagram of a clothes airing machine abnormal condition reminding system according to a preferred embodiment of the invention;

fig. 3 is a structural block diagram ii of a clothes airing machine abnormal condition reminding system according to a preferred embodiment of the present invention;

FIG. 4 is a block diagram of a motor speed detection module according to a preferred embodiment of the present invention;

FIG. 5 is a flow chart of motor speed data detection in accordance with a preferred embodiment of the present invention;

FIG. 6 is a flow chart of the detection of the travel of the airing bars according to a preferred embodiment of the invention;

fig. 7 is a first flowchart of a method for detecting abnormal conditions of a motor of a clothes drying machine according to a preferred embodiment of the invention;

fig. 8 is a second flowchart of a method for detecting abnormal conditions of a motor of a clothes drying machine according to a preferred embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.

It should be noted that: like reference numerals refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The clothes drying system provided by the embodiment is an intelligent clothes drying machine which comprises a main machine part and drying rods, wherein the main machine part and the drying rods are fixedly installed on a ceiling of an indoor balcony, and the drying rods are connected with the main machine part through steel wire ropes respectively arranged at two ends of the main machine part and hung below the main machine part.

As shown in fig. 1, the main unit part includes a main unit housing, and a built-in power supply assembly 1, an MCU controller 2, a lifting motor 5, and a wire winding device 6 for a wire rope. The power assembly 1 supplies power to the lifting motor 5, the MCU controller 2 and other built-in components, the MCU controller 2 controls the lifting motor 5 to rotate, and the lifting motor 5 drives the winding device 6 to wind and unwind the steel wire rope, so that the lifting function of the airing rod 7 is realized.

The MCU controller 2 is provided with a remote control receiving module 4, and is communicated with a remote controller, a wall switch or a voice recognition module through the remote control receiving module 4. The user controls the MCU controller 2 by operating the remote controller and the wall switch or sending voice instructions to the voice recognition module, so that the function of the clothes airing machine can be selectively controlled by the user.

The elevating motor 5 may have an over-high temperature, i.e., an overheat state, during the operation. The overheating state of the lifting motor 5 can stop the motor, and further the motor can be burnt out or components can be damaged. The reasons for the occurrence of the overheated state of the lift motor 5 include: firstly, a transmission mechanism of the lifting motor 5 is blocked due to the existence of foreign matters, so that the motor is difficult to operate and the temperature of the motor is increased; secondly, the transmission mechanism of the lifting motor 5 is lack of lubricating oil, and the motor is difficult to operate, so that the temperature of the motor is increased; thirdly, the user frequently lifts the airing bars 7, causing the motor to continuously operate and the temperature of the motor to continuously rise.

In order to protect the motor and relevant components from being damaged, the clothes airing machine is further provided with a motor overheating protection module 8 for carrying out overheating protection on the lifting motor 5. As shown in fig. 2, the motor overheat protection module 8 includes a temperature controller a, and when the temperature of the elevator motor 5 exceeds a threshold, the temperature controller turns off the power supply of the elevator motor 5, so that the motor is stopped to protect the motor.

A second version of the motor overheat protection module, shown in fig. 3, includes a temperature sensor B for detecting a temperature signal of the elevator motor. The MCU controller 3 receives and processes the temperature signal of the lifting motor, and when the temperature of the lifting motor 5 exceeds a threshold value, the power supply of the lifting motor is cut off through an electronic switch.

The lifting motor 5 of the clothes airing machine has set load capacity, when the weight of clothes hung on the airing rod 7 exceeds the set load capacity, the torque of the lifting motor 5 is small enough not to drive the airing rod 7 to ascend, and the lifting motor 5 stops rotating. However, in this state, the airing bars 7 are lowered to be operated.

Therefore, in the actual use process of the user, when the lifting motor 5 stops rotating, the user cannot rapidly distinguish whether the motor is in an overweight state or an overheated state, so that different countermeasures are difficult to be taken aiming at different states, and faults are rapidly removed to enable the clothes drying machine to recover to be normally used.

As shown in fig. 2 and 3, the clothes drying system provided by the present embodiment further includes a clothes drying machine abnormal condition reminding system, which includes a motor abnormal condition detecting module 10 and a reminding module 11. The motor abnormal condition detection module 10 comprises the MCU controller 2, the lifting motor 5, the motor overheating protection module 8 and the motor rotating speed detection module 9. The MCU controller 2 is respectively connected with the lifting motor 5 and the motor rotating speed detection module 9. The motor overheating protection module is connected with the lifting motor and used for cutting off the power supply when the working temperature of the lifting motor exceeds a threshold value.

The motor rotating speed detection module 9 is used for sensing the rotation of the lifting motor 5, and the MCU controller 2 detects the rotating speed of the motor and performs multi-stage judgment through the operation of a rotating signal sent by the motor rotating speed detection module 9, so that whether the motor is in an overweight state or not is judged.

And performing primary judgment when the abnormal conditions occur in the rising process of the airing rod 7, wherein if the rotating speed of the motor is zero, the motor load is overweight or the motor is subjected to overheat protection. The motor abnormal condition detection module 10 can also detect the position of the airing rod 7, and the airing rod 7 is driven to further operate through the MCU controller 2 so as to carry out secondary and tertiary judgment. When the airing rod 7 descends, the rotating speed of the motor is detected, if the rotating speed of the motor is still zero, the airing rod 7 cannot operate when ascending and descending, and the motor is subjected to overheat protection. If the descending rotation speed of the motor is not zero, the airing rod 7 cannot ascend and can descend, the motor load is overweight, and the MCU controller 2 judges that the motor load is in an overweight state.

The reminding module 11 communicates with the MCU controller 2, and corresponding instructions are sent to the reminding module 11 after the MCU controller 2 judges the state. The reminding module 11 sends out a reminding signal that the lifting motor 5 is in an overweight state or an overheated state to a user according to an instruction sent by the MCU controller 2.

Preferably, the reminding module 11 is a display screen for displaying reminding information or a sound-producing element for playing reminding sound. The display screen or sound generating element may be mounted on the main unit part, the airing bar 7 or other external part communicating with the airing machine.

Preferably, the MCU controller 2 controls the elevation of the elevation motor 5 through an electronic switch. The electronic switch can be a relay, a silicon controlled rectifier and other components.

Further, as shown in fig. 4, the motor rotation speed detection module 9 includes a magnetic element 12 and a hall sensor 13. Specifically, the magnetic member 12 is mounted on the shaft of the elevator motor 5 to rotate with the motor. The hall sensor 13 is fixedly installed at a corresponding position of the magnetic element 12 to sense the magnetic field strength of the magnetic element 12. Preferably, the hall sensor 13 may be installed inside the main machine case.

As shown in fig. 5, when the magnetic element 12 rotates with the rotating shaft of the lifting motor 5 to approach the hall sensor 13, the hall sensor 13 senses the magnetic field of the magnetic element 12 and sends the sensed magnetic field signal to the MCU controller 2, and the MCU controller 2 receives and records the magnetic field signal sent by the hall sensor 13.

When the magnetic element 12 rotates along with the motor rotating shaft and is far away from the hall sensor 13, the hall sensor 13 cannot sense the magnetic field of the magnetic element 12, and at the moment, the hall sensor 13 senses that a magnetic field-free signal is sent to the MCU controller 2. Therefore, when the motor rotates one turn, the hall sensor 13 will only output one magnetic field signal to the MCU controller 2. Thus, the MCU controller 2 can judge the number of rotations S of the elevating motor 5 by recording and calculating the number H of magnetic field signals output from the hall sensor 13.

Furthermore, the MCU controller 2 further comprises a timer for recording the operation time T of the elevator motor 5. The MCU controller 2 obtains the rotating speed data of the lifting motor 5 through the analysis and the processing of the rotating number S of the motor and the running time T of the motor: the rotating speed V is S/T and H/T.

As shown in fig. 6, the signal detected by the motor rotation speed detection module 9 can detect the rotation speed V of the lifting motor 5 and can also calculate the travel of the airing rod 7 to determine the position of the airing rod 7.

The stroke of the primary gear of the lifting motor 5 rotating for one circle is the circumference of the gear, C is pi D, and D is the diameter of the primary gear. The travel L of the airing rod 7 is calculated by taking the limit L0 as a reference, L0+ SC/N-L0 + S pi D/N, and N is the reduction ratio of the motor gear. Above, pi and D, N are invariable constants, and the upper limit L0 is set when the product is installed, so that the stroke of the airing rod 7 can be calculated by the MCU controller 2 through the number of turns of the motor, and the position L1 of the airing rod 7 can be determined.

It should be noted that the hall sensor 13 of the motor speed detection module 9 may also be replaced by other magnetic-sensing sensors to detect the rotation signal of the motor rotating shaft.

As shown in fig. 7, the specific steps of the method for detecting the abnormal condition of the motor of the clothes drying system of the clothes drying machine will be explained.

Firstly, a user controls the MCU controller 2 by operating a remote controller and a wall switch or sending a voice instruction to a voice recognition module, and a remote control receiving module 4 of the MCU controller 2 receives a lifting instruction of the airing rod 7 so as to start a rotating instruction to the lifting motor 5, so that the lifting motor 5 operates to drive the airing rod 7 to lift.

In the rising process, the motor rotating speed detection module 9 sends a rotation signal to the MCU controller 2 when the lifting motor 5 rotates, namely, a magnetic field signal is sent to the MCU controller 2 when the motor rotating shaft rotates for one circle, the MCU controller 2 detects the rotating speed V1 of the lifting motor 5 through rotation signal operation, and the MCU controller 2 carries out primary judgment on the using state of the clothes airing machine according to the rotating speed V1 of the lifting motor 5.

And thirdly, if the rotating speed V1 is greater than 0rpm and is a working rotating speed, judging that the service state of the lifting motor 5 is normal, wherein the general working rotating speed is 2800 rpm.

And fourthly, if the rotating speed V1 is 0rpm, judging that the motor stops rotating, at the moment, the clothes drying machine is in an overweight state or an overheated state, further calculating and detecting the travel L of the drying rod 7 by the MCU controller 2, so as to judge the position L1 of the drying rod 7, comparing the position L1 of the drying rod 7 with the set lower limit of the drying rod 7, and carrying out secondary judgment on the state of the clothes drying machine according to the position L1 of the drying rod 7.

And fifthly, if the position L1 of the airing rod 7 is at the lower limit, the lifting motor 5 can be judged to be in the overweight state in the second-stage mode, at the moment, the MCU controller 2 cuts off the power supply of the lifting motor 5, stops the operation of the lifting motor 5 and sends an overweight reminding instruction to the reminding module 11, and the reminding module 11 sends a reminding signal that the clothes airing machine is in the overweight state to the user after receiving the overweight reminding instruction.

And sixthly, if the position L1 of the airing rod 7 is not at the lower limit position after being analyzed and processed by the MCU controller 2, sending a reverse operation instruction to the lifting motor 5 to drive the airing rod 7 to descend. The motor rotating speed detection module 9 sends a rotation signal to the MCU controller 2 when the lifting motor 5 rotates, namely, a magnetic field signal is sent to the MCU controller 2 when the motor rotating shaft rotates for one circle, the MCU controller 2 detects the rotating speed V2 of the lifting motor 5 through rotation signal operation, and the MCU controller 2 carries out three-level judgment on the using state of the clothes drying machine according to the rotating speed V1 of the lifting motor 5.

Seventhly, if the rotating speed V2 of the lifting motor 5 is 0rpm, the lifting motor 5 is in an overheating state, the operation of the lifting motor 5 is stopped, the MCU controller 2 finds an overheating reminding instruction to the reminding module 11, and the reminding module 11 sends a reminding signal that the clothes drying machine is in the overheating state to a user after receiving the instruction.

Eighthly, if the rotating speed V2 of the lifting motor 5 is greater than 0rpm, judging that the lifting motor 5 is in an overweight state, controlling the lifting motor 5 to operate by the MCU controller 2, enabling the airing rod 7 to descend to a lower limit position, finding an overweight reminding instruction to the reminding module 11, and sending a reminding signal that the clothes airing machine is in the overweight state to a user after the reminding module 11 receives the instruction.

When the motor load is detected to be overweight, the drying rod 7 is lowered to the lower limit position, so that a user can conveniently take clothes hung on the drying rod 7, and the motor load is reduced.

In the second solution of the motor overheating protection module shown in fig. 3, the specific steps of the method for detecting the motor abnormal condition of the clothes drying system of the clothes drying machine may also be as shown in fig. 8.

The MCU controller receives an airing rod lifting instruction, the lifting motor drives the airing rod to lift, and the motor temperature t is detected; if the temperature t of the lifting motor is greater than a set threshold value, the lifting motor is in an overheat state, the operation of the lifting motor is stopped, and overheat reminding is carried out; if the temperature t of the lifting motor is less than or equal to a set threshold value, detecting the rotating speed V1 of the lifting motor; if the rotating speed V1 of the lifting motor is greater than 0, the lifting motor works normally; if V1 is equal to 0, then the elevator motor is in overweight state, and the elevator motor descends to lower limit and is overweight to remind.

The motor abnormal condition detection module, the detection method, the abnormal condition reminding system and the clothes drying system provided by the invention are described in detail, specific examples are applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiments is only used for helping to understand the invention and the core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (11)

1. The abnormal condition reminding system is used in the clothes airing machine and is characterized by comprising an MCU controller, a lifting motor, a motor rotating speed detection module, a motor overheating protection module and a reminding module, wherein the MCU controller is respectively connected with the lifting motor, the motor rotating speed detection module and the reminding module, and receives and processes a rotating signal detected by the rotating speed detection module; the motor overheating protection module is connected with the lifting motor and used for cutting off a power supply when the working temperature of the lifting motor exceeds a threshold value; the reminding module sends out a reminding signal that the lifting motor is in an overweight state or an overheated state to a user according to an instruction sent by the MCU controller.

2. A malfunction alerting system according to claim 1, wherein the motor rotation speed detecting module includes a magnetic element and a hall sensor or a magnetic sensor mounted on a rotating shaft of the elevator motor to detect a rotation signal of the elevator motor.

3. A malfunction alerting system as claimed in claim 2, wherein said MCU controller receives and processes said rotational signal to obtain rotational speed data of the elevator motor.

4. The abnormal condition reminding system as claimed in claim 2, wherein the lifting motor drives the airing rod to lift, and the MCU controller receives and processes the rotation signal to obtain the lifting travel data of the airing rod.

5. The abnormal situation reminding system according to claim 2, wherein the motor overheat protection module comprises a temperature controller, and when the temperature of the elevator motor exceeds a threshold value, the temperature controller cuts off the power supply of the elevator motor.

6. A malfunction alerting system as claimed in claim 2, wherein said motor overheat protection module includes a temperature sensor for detecting a temperature signal of the elevator motor.

7. A malfunction alerting system according to claim 6, wherein the MCU controller receives and processes the temperature signal of the lift motor, and disconnects the power supply of the lift motor through the electronic switch when the temperature of the lift motor exceeds a threshold value.

8. The abnormal situation reminding system according to claim 1, wherein the reminding module is a display screen for displaying reminding information or a sound generating element for playing reminding sound; the MCU controller controls the lifting of the lifting motor through an electronic switch.

9. Laundry drying system, characterized in that it comprises a malfunction alerting system according to any one of claims 1-8.

10. The motor abnormal condition detection module is used in the clothes airing machine and is characterized by comprising an MCU controller, a lifting motor, a motor rotating speed detection module and a motor overheating protection module; the MCU controller is respectively connected with the lifting motor and the motor rotating speed detection module; the MCU controller controls the lifting motor, the motor rotating speed detection module detects a rotating signal of the lifting motor, and the MCU controller receives and processes the rotating signal detected by the rotating speed detection module; the motor overheating protection module is connected with the lifting motor and used for cutting off a power supply when the working temperature of the lifting motor exceeds a threshold value.

11. The motor abnormal condition detection method of the clothes drying system is characterized by comprising the following specific steps;

the MCU controller receives an airing rod ascending instruction, the lifting motor drives the airing rod to ascend, and the rotating speed V1 of the lifting motor is detected;

if the rotating speed V1 of the lifting motor is greater than 0, the lifting motor works normally; if V1 is equal to 0, detecting an airing rod position L1;

if the airing rod position L1 is at a lower limit position, the lifting motor is in an overweight state, the lifting motor stops running and overweight reminding is carried out;

if the position L1 of the drying rod is not at the lower limit, the drying rod descends, and the rotating speed V2 of the lifting motor is detected;

if the rotating speed V2 of the lifting motor is equal to 0, the lifting motor is in an overheating state, the operation of the lifting motor is stopped, and overheating reminding is carried out; if V2 is greater than 0, then the elevator motor is in overweight state, and the elevator motor descends to lower limit and is overweight to remind.

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