A heating wire abnormality detection method and a blow-drying device thereof

Abstract

A heating wire abnormality detection method is applied to a blower drying device, including an MCU and a heating wire detection circuit. Before the heating wire operates normally, a first voltage is applied to the heating wire, and then the calculated electrical parameters of the heating wire are detected to see if they are within a preset electrical parameter threshold range or threshold. If the calculated electrical parameters are not within the preset electrical parameter threshold range or threshold, the fan is started to blow air, and the electrical parameters are detected again to see if they are within the preset electrical parameter threshold range or threshold. If the calculated electrical parameters are within the preset electrical parameter threshold range or threshold, a second voltage is applied to the heating wire to ensure normal operation. If they are still within the preset electrical parameter threshold range or threshold, the device is stopped and an alarm is triggered.

Description

Technical Field

[0001] This invention relates to a method for detecting abnormal heating wires, specifically, to a method for detecting abnormal heating wires in a blower drying device and the blower drying device itself, belonging to the field of blower drying of vehicle mats. Background Technology

[0002] Existing blower drying devices typically include a fan. The air generated by the fan passes through a heating wire at the air outlet to produce hot air for drying mats, blankets, towels, etc. When blower drying devices are used in car washes to dry floor mats inside vehicles, the high humidity in car washes can cause water to spray into the blower drying device during car washing or mat washing. This water can then enter the heating wire at the air outlet, causing a short circuit in the heating wire, resulting in equipment failure and personal safety hazards. This problem can also occur if very humid air enters the blower drying device.

[0003] In addition, the heating wires of this type of high-power hot air blower have high power and high voltage, and are usually installed at the air outlet of the blower. During use, foreign metal objects may enter the heating wire or metal fragments may fall into the heating wire, causing short circuits between the heating wire turns. Alternatively, when children are playing, they may throw foreign metal objects such as nails from the air outlet pipe and they may fall onto the surface of the heating wire, which may also cause short circuits between the heating wire turns, creating personal safety hazards and equipment failures.

[0004] Furthermore, the heating wire may also break or slightly break due to other reasons, causing it to malfunction and preventing the hot air drying function of the blower from starting properly. This requires manual disassembly and wire disconnection to troubleshoot the problem, rather than directly pinpointing the exact location of the malfunction. If the heating wire becomes thinner or shorter due to physical reasons, it can also affect its resistance, leading to a short circuit. Summary of the Invention

[0005] This technical solution provides a method for detecting abnormal heating wires in a blower drying device. Before the heating wires operate normally, it can detect whether the heating wires are abnormal in advance. If an abnormality occurs, it can automatically control and eliminate the first factor causing the abnormality. If the abnormality is caused by other reasons, it will issue a warning. It has a high degree of automation, can ensure the normal operation of the equipment and eliminate personal safety hazards, and does not require additional hardware. It can be controlled by software program only.

[0006] To achieve the above objectives, a method for detecting abnormal heating wires, comprising an MCU and a heating wire detection circuit, is applied to a blower drying device, characterized in that...

[0007] Step 1: Before the heating wire is working normally, a first voltage is applied to the heating wire detection circuit for a period of time. The heating wire detection circuit detects the electrical parameters at both ends of the heating wire at each sampling time obtained according to the sampling interval during the time period.

[0008] Step 2: Based on the electrical parameters at both ends of the heating wire at each sampling time within the time period, obtain the measured electrical parameters representing the electrical parameters of the heating wire throughout the entire time period;

[0009] Step 3: Determine the next action based on the comparison result between the calculated electrical parameters and the preset electrical parameters;

[0010] Step 4: If the comparison result shows that the measured electrical parameters are not within the preset electrical parameter threshold range, then the heating wire is determined to be abnormal. The MCU controls the start of the gas generator in the blowing and drying device. The gas generator stops blowing after a predetermined time, and then steps 1, 2 and 3 are repeated.

[0011] Step 5: After executing Step 4, if the electrical parameters are within or within the preset electrical parameter threshold range, the MCU will automatically eliminate the first abnormal factor. At this time, a second voltage higher than the first voltage can be applied to the heating wire to ensure normal operation.

[0012] Step six: After executing step four, if the electrical parameters are still not within the preset electrical parameter threshold range or threshold, it indicates that the heating wire is still in an abnormal state, and the MCU will issue an abnormal warning. The preset electrical parameter threshold range or threshold is determined based on the fact that the heating wire can work normally.

[0013] In the above-described technical solution, before the heating wire operates normally, a first voltage is applied to the heating wire for a period of time to activate it. The heating wire detection circuit detects the electrical parameters at both ends of the heating wire at each sampling time interval within this period. Based on the resistance or current parameters at both ends of the heating wire at each sampling time within this period, the calculated electrical parameters representing the electrical parameters of the heating wire throughout the entire period are obtained. Because the electrical parameters of the heating wire at each moment within a whole period may fluctuate, sampling the electrical parameters at both ends of the heating wire at each moment to obtain the calculated electrical parameters for the entire period ensures high accuracy. The next step is determined based on the comparison between the calculated electrical parameters and a pre-set electrical parameter threshold. If the calculated electrical parameters... If the electrical parameters are outside the normal operating threshold range of the heating wire, indicating an abnormality, the MCU will activate the gas generator in the drying device. The gas generator will blow air for a predetermined time and then stop. The first voltage will be applied to the heating wire again for another test. If the measured electrical parameters are within or outside the normal operating threshold range of the heating wire, the abnormality caused by the first factor will be automatically eliminated. At this point, a second voltage higher than the first voltage can be applied to the heating wire to ensure normal operation. If, after the MCU activates the gas generator to blow air onto the heating wire and the first voltage is applied again, the measured electrical parameters are still outside or outside the normal operating threshold range of the heating wire, the MCU will issue an abnormality warning, requiring manual shutdown to eliminate the abnormality caused by the second factor. This heating wire malfunction detection method detects potential abnormalities in the heating wire in advance and automatically controls the system to eliminate the primary cause of the malfunction and allow the heating wire to return to normal operation. This factor does not require manual intervention. Furthermore, it can detect other factors causing the heating wire malfunction and issue an alert to stop the machine. It utilizes the hardware of the blowing and drying device itself (i.e., the gas generator of the blowing and drying device itself, which is activated when blowing air onto the heating wire), without the need for additional hardware. Software control is sufficient, resulting in low equipment cost, high automation, and safety and reliability.

[0014] In this technical solution, in step four, if the measured electrical parameter is not within or within the preset electrical parameter threshold range, or if the measured electrical parameter is less than the lower limit threshold of the preset electrical parameter threshold range or less than the preset threshold, then the heating wire is determined to be short-circuited, and the MCU controls the start of the gas generator in the blowing and drying device to blow for a predetermined time.

[0015] In the above-described technical solution, the MCU only controls the gas generator in the blowing and drying device to start blowing when a short circuit in the heating wire is detected. Since a short circuit in the heating wire is usually caused by water entering the heating wire, metal debris falling in, or iron nails, starting the gas generator can blow away the metal debris between the heating wires or dry the moisture, thus eliminating this abnormal factor. In other cases, the MCU starting the gas generator to blow cannot eliminate this abnormal factor. For example, if the heating wire is open-circuited, this factor cannot be automatically eliminated. This can avoid the waste of electricity caused by frequently starting the gas generator in the blowing and drying device.

[0016] In this technical solution, preferably, in step four, if the measured electrical parameter is not within or outside the preset electrical parameter threshold range, or if the measured electrical parameter is greater than the upper limit threshold of the preset electrical parameter threshold range or greater than the preset threshold, then the heating wire is determined to be open-circuited, the MCU prohibits the start of the gas generator in the blowing drying device, and steps one, two, and three are not repeated, and the MCU directly issues an abnormal warning.

[0017] In the above-described technical solution, when the MCU determines that the heating wire is open-circuited, starting the gas generator in the blowing and drying device to blow air can no longer automatically eliminate the first abnormal factor. At this time, an abnormality reminder can be issued directly, indicating that an open-circuit abnormality has occurred and manual troubleshooting is required. The abnormality type is more clearly identified, concise and clear, and highly interactive with humans. In this technical solution, preferably, the heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. Applying a first voltage to the heating wire detection circuit for a period of time constitutes applying a first voltage to the voltage divider resistor and the heating wire. The measured electrical parameter is a measured voltage parameter. The preset electrical parameter threshold range or threshold is a voltage parameter threshold range or voltage parameter threshold. The first voltage is set to V1. If the measured voltage parameter is less than the lower limit of the preset voltage parameter threshold range and greater than N×V1, or if the measured voltage parameter is less than the preset voltage parameter threshold and greater than N×V1, the MCU determines that the heating wire is a first type of short circuit. If the measured voltage parameter is less than or equal to N×V1 and greater than or equal to zero, the MCU determines that the heating wire is a second type of short circuit, where N is a number in the interval (0, 1).

[0018] In the above-described technical solution, the heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. The voltage divider resistor can limit excessive current in the detection circuit. A first voltage is applied to the voltage divider resistor and the heating wire, and the voltage parameter across the heating wire is calculated by dividing the voltage through the voltage divider resistor. The calculated voltage parameter is compared with a lower limit threshold or a set threshold value within a set voltage parameter threshold range, as well as another set value that is greater than or equal to zero and less than the lower limit threshold or a set threshold value within the voltage parameter threshold range, to determine which interval it falls into, thereby classifying the degree of short circuit and determining the short circuit level. This results in a richer short circuit anomaly detection result, which can meet practical needs. In this technical solution, preferably, the heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. Applying a first voltage to the heating wire detection circuit for a period of time means applying a first voltage to the voltage divider resistor and the heating wire. The measured electrical parameter is a measured voltage parameter. The preset electrical parameter threshold range or threshold is a voltage parameter threshold range or voltage parameter threshold. The first voltage is set to V1. If the measured voltage parameter is greater than the upper limit threshold of the preset voltage parameter threshold range and less than N1×V1, or if the measured voltage parameter is greater than the preset voltage parameter threshold and less than N1×V1, the MCU determines that the heating wire is a first type of open circuit. If the measured voltage parameter is greater than or equal to N1×V1 and less than or equal to V1, the MCU determines that the heating wire is a second type of open circuit, where N1 is a number in the interval (0, 1).

[0019] In the above-described technical solution, the heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. The voltage divider resistor can limit excessive current in the detection circuit. A first voltage is applied to the voltage divider resistor and the heating wire. The voltage parameter across the heating wire is calculated by dividing the voltage through the voltage divider resistor. The calculated voltage parameter is compared with the upper limit threshold or the lower limit threshold of the voltage parameter in the set voltage parameter threshold range, as well as another set value that is greater than the upper limit threshold or the lower limit threshold and less than or equal to the first voltage V1 range, to determine which range it falls into, thereby classifying the degree of open circuit and determining the open circuit level. This results in a more comprehensive open circuit anomaly detection, allowing users to determine the degree of open circuit in advance and take appropriate measures based on the open circuit detection level.

[0020] In this technical solution, preferably after the MCU automatically eliminates the first abnormal factor and applies a second voltage higher than the first voltage to the heating wire to ensure normal operation, the MCU also automatically controls the gas generator in the blowing and drying device to work normally.

[0021] In the above-described technical solution, after the MCU automatically eliminates the first abnormal factor, the heating wire can work normally. At this time, the MCU can automatically control the gas generator in the blower drying device to work normally. The gas generator produces gas and generates hot air through the heating wire for blower drying. After eliminating this abnormal factor, the user does not need to manually start the gas generator in the blower drying device. The MCU controls the automatic start-up, which has a high degree of automation, avoids frequent user operation, and reduces user actions.

[0022] In this technical solution, it is preferred to further include a voltage converter, which is connected to the MCU signal. The MCU sends a first signal to the voltage converter to apply a first voltage to the heating wire, or the MCU sends a second signal to the voltage converter to apply a second voltage to the heating wire.

[0023] In the above-described technical solution, the MCU generates a first signal or a second signal to the voltage converter. The voltage converter applies a first voltage to the heating wire or applies a second voltage to the heating wire according to the first signal or the second signal. The MCU controls the voltage converter to apply high voltage or low voltage to the heating wire. This method is safer and simpler to control than directly applying low voltage or high voltage to the heating wire.

[0024] In this technical solution, a first warning signal is issued when the MCU determines that the heating wire is short-circuited of the first type, and a second warning signal is issued when the MCU determines that the heating wire is short-circuited of the second type; and / or a third warning signal is issued when the MCU determines that the heating wire is open-circuited of the first type, and a fourth warning signal is issued when the MCU determines that the heating wire is open-circuited of the second type.

[0025] In the above-described technical solution, short circuits and open circuits can be detected to different degrees. Based on the detected short circuit and open circuit levels, the MCU can issue four different signals to warn the user of four different abnormalities, which is intuitive, clear, and highly alert.

[0026] In this technical solution, a blower drying device is also provided, including a memory, characterized in that the memory stores a program for the heating wire abnormality detection method as described above.

[0027] After the program for detecting abnormal heating wires is stored in the memory of the air-blowing drying device, the detection of abnormal heating wires can be completed using the hardware facilities of the air-blowing drying device itself, without the need for additional hardware.

[0028] In this technical solution, a blower drying device is also provided, including a circuit and a controller, characterized in that the controller uses the heating wire abnormality detection method described above to detect the heating wire.

[0029] The above-mentioned air-blowing drying device includes circuitry and a controller. After the controller uses the heating wire abnormality detection method described above to detect the heating wire, it can automatically control and eliminate the heating wire abnormality caused by the first factor in advance. If the heating wire abnormality is caused by other reasons, an alarm will be issued. This air-blowing drying device has a high degree of automation, can ensure the normal operation of the equipment and eliminate personal safety hazards, does not require additional hardware, and can be controlled by software program only, making it extremely commercially valuable. Attached Figure Description

[0030] Figure 1 This is a diagram illustrating a method for detecting abnormalities between heating wire coils in the air-blowing drying device of the present invention.

[0031] Figure 2 This is a flowchart of the abnormal detection process for the heating wire in the blower drying device of the present invention;

[0032] Figure 3 This is a circuit diagram for detecting abnormal heating wires in the blower drying device of the present invention.

[0033] Figure 4 This is a side perspective view of the air-blowing drying device of the present invention;

[0034] Figure 5 This is a side perspective view of the heating component in the invention;

[0035] Figure 6 This is a side perspective view of the blower drying module of the present invention;

[0036] Figure 7 This is a view showing the motion state of the gas generator in this invention;

[0037] Figure 8 This is a top view showing the connection between the gas generator, the distributor, and the air outlet in this invention;

[0038] Figure 9 This is the logic control diagram of the air-blowing drying device of the present invention. Detailed Implementation

[0039] To facilitate understanding of the principles and objectives of the present invention, reference will now be made to the embodiments illustrated in the accompanying drawings described herein. The embodiments disclosed herein are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Rather, the embodiments were chosen and described so that others skilled in the art could utilize these teachings. Therefore, it is not intended to limit the scope of the claimed invention. The present invention includes any modifications and further alterations to the illustrated apparatus and described methods, as well as further applications of the principles of the invention, that will generally be understood by those skilled in the art. It should be noted that, for ease of explanation, the following description uses only a vehicle interior mat used in the blower-drying device of the present invention for blower-drying, and the mat is the footrest under the seat in the vehicle, but is not limited thereto.

[0040] See Figure 1 , Figure 2 and Figure 3 A method for detecting abnormal heating wire in a blower drying device includes an MCU and a heating wire detection circuit. Before the heating wire operates normally, in step one (S01), a first voltage is applied to the heating wire detection circuit for a period of time, during which the heating wire detection circuit detects the electrical parameters at both ends of the heating wire at each sampling time interval within the time period. In step two (S02), based on the electrical parameters at both ends of the heating wire at each sampling time within the time period, a calculated electrical parameter representing the electrical parameters of the heating wire throughout the entire time period is obtained. In step three (S03), the next action is determined based on the comparison result between the calculated electrical parameter and a preset electrical parameter threshold range or threshold. In step four (S04), if the comparison result indicates that the calculated electrical parameter is not within the preset electrical parameter threshold range... If the measured electrical parameters are within the pre-set threshold range or threshold after step four, the MCU controls the start of the gas generator in the blowing and drying device. The gas generator stops blowing after a predetermined time, and then steps one, two, and three are repeated. In step five (S05), after step four, if the measured electrical parameters are within the pre-set threshold range or threshold, the MCU automatically eliminates the first abnormal factor. At this time, a second voltage higher than the first voltage can be applied to the heating wire for normal operation. In step six (S06), after step four, if the measured electrical parameters are still not within the pre-set threshold range or threshold, it indicates that the heating wire is still in an abnormal state. The MCU issues an abnormal warning. The pre-set threshold range or threshold is determined based on the heating wire's ability to work normally.

[0041] When detecting the electrical parameters of the heating wire, the current or voltage parameters of the heating wire fluctuate at each moment throughout a given time period. Sampling the current or voltage at each moment to obtain the calculated current or voltage parameters for the entire time period will yield a more accurate result. In this specific embodiment, by accumulating the electrical parameters at each sampling moment within the time period to obtain the average electrical parameter value for the entire time period, the obtained electrical parameter calculation parameters will be more accurate and better reflect the changes in the electrical parameters of the heating wire throughout the time period. This ensures that the subsequent comparison of the calculated electrical parameters with a pre-set electrical parameter threshold is accurate and avoids misjudgments.

[0042] The heating wire abnormality detection method described above can detect whether the heating wire is abnormal in advance. After the heating wire is abnormal, it can automatically control and eliminate the first abnormal factor causing the abnormality and allow the heating wire to work normally. This factor does not need to be eliminated manually. It can also detect other factors causing the heating wire abnormality and issue an alarm that the machine needs to be stopped and the fault needs to be eliminated manually. It utilizes the hardware facilities of the blowing and drying device itself (that is, when blowing air on the heating wire, the gas generator of the blowing and drying device itself is activated). No additional hardware is needed. It can be controlled by software program. The equipment has low cost, high degree of automation, and is safe and reliable.

[0043] In this embodiment, the aforementioned electrical parameters are voltage parameters, the calculated electrical parameters are calculated voltage parameters, and the preset electrical parameter threshold range is the voltage parameter threshold range. The voltage parameter threshold range is a closed interval from the lower threshold of the voltage parameter to the upper threshold of the electrical parameter, and the preset threshold is a fixed threshold. When the calculated electrical parameter is not within the preset electrical parameter threshold range or threshold, it means that the calculated voltage parameter is not within the closed interval from the lower threshold of the voltage parameter to the upper threshold of the voltage parameter. The calculated electrical parameter not being within the preset electrical parameter threshold means that the calculated voltage parameter is not equal to the preset fixed voltage parameter threshold. In a constant temperature and humidity working environment for the heating wire, a fixed voltage threshold is typically set for the heating wire to operate normally. However, in a non-constant temperature and humidity working environment for the heating wire, the resistance of the heating wire will be affected by the ambient temperature. Typically, a closed interval range is set for the voltage threshold for the heating wire to operate normally. The voltage threshold range or the fixed voltage threshold is stored in the memory of the MCU.

[0044] The initial voltage applied to the heating wire is usually a relatively low voltage, such as 3V, 5V, 7V, or 7.6V. Even if the heating wire is found to be abnormal after testing, it will not pose a danger to the human body.

[0045] In step four (S04) above, if the measured voltage parameter is not within or outside the preset voltage parameter threshold range, the heating wire is determined to be abnormal. If the measured electrical parameter is less than the lower limit threshold of the preset electrical parameter threshold range or less than the preset threshold, the abnormality of the heating wire is determined to be a short circuit. Only then does the MCU control the gas generator in the blowing and drying device to blow for a predetermined time. Since a short circuit in the heating wire is usually caused by water entering the heating wire, metal debris falling into it, or nails, starting the gas generator can blow away the metal debris between the heating wires or dry the moisture, thus eliminating this abnormal factor. In other cases, the MCU starting the gas generator to blow cannot eliminate this abnormal factor. For example, if the heating wire is open-circuited, this factor cannot be automatically eliminated. This avoids the waste of electricity caused by frequently starting the gas generator in the blowing and drying device. After eliminating this abnormal factor, the gas generator applies the first voltage to the heating wire again for another test. If the measured voltage parameter is within or within the preset voltage parameter threshold range, the short circuit abnormality of the heating wire caused by the first abnormal factor is automatically eliminated. Then, a second voltage higher than the first voltage (the second voltage is usually much higher than the first voltage, typically 110V, 220V, or 380V, as long as it is higher than the first voltage and meets the normal operating voltage) can be applied to the heating wire to ensure normal operation. The first abnormal factor that usually affects the short circuit abnormality of the heating wire is water ingress or the presence of metal debris. When water enters the heating wire, the water will lower the surface temperature of the heating wire. Since the resistance of a metal conductor generally increases with increasing surface temperature and decreases with decreasing temperature, the resistance of the heating wire will suddenly decrease after water enters the wire. If a high voltage is applied normally at this time, the instantaneous current generated will be very large, and the heating wire will burn out. On the other hand, when metal shavings fall onto the surface of the heating wire, the shavings are connected in parallel between the turns of the heating wire. The total resistance of the shavings and the heating wire is smaller than the original resistance of the heating wire. If a high voltage is applied directly without detection, the current passing through will be very large, causing a short circuit and the heating wire will also burn out. However, after blowing air, the moisture on the surface of the heating wire is dried and evaporated, or the metal shavings are blown away. This allows for automatic fault identification and control to eliminate the fault. The degree of automation is high, no manual operation is required, and it is very user-friendly.

[0046] After determining that the heating wire is abnormally short-circuited, the gas generator is started to blow air onto the heating wire. If the first voltage is repeatedly applied to the heating wire for detection, and the calculated voltage parameter is still not within or outside the preset voltage parameter threshold range, the MCU will issue an abnormal warning (the warning signal can be an audible, visual, or tactile signal, such as an alarm sound or a flashing red light).

[0047] Alternatively, the display screen may show abnormal information, including the resistance value of the heating wire. Typically, this type of abnormality is caused by a metal object such as a nail falling between the heating wire coils. The gas generator cannot blow this object away, and the system cannot automatically eliminate this factor. Therefore, manual intervention (removing the nail) is required to address the second factor causing the short circuit between the heating wire coils. The heating wire abnormality detection method described above detects short circuits in advance and automatically controls the system to eliminate some of the factors causing the short circuit, allowing the heating wire to return to normal operation. This eliminates the need for manual intervention. Furthermore, it can detect other factors causing short circuits between the heating wire coils, issuing a warning that manual intervention is required, resulting in a high degree of automation.

[0048] In step four (S04) above, when the calculated electrical parameter is not within or outside the preset electrical parameter threshold range, if the calculated electrical parameter is greater than the upper limit threshold of the preset electrical parameter threshold range or greater than the preset threshold, then the heating wire is determined to be open-circuited. The MCU prohibits the start of the gas generator in the blowing drying device, and steps one, two, and three are not repeated. The MCU directly issues an abnormal warning. When the MCU determines that the heating wire is open-circuited, starting the gas generator in the blowing drying device to blow air can no longer automatically eliminate the first abnormal factor. At this time, it can directly issue an abnormal warning that an open-circuit abnormality has occurred, requiring manual troubleshooting of the open-circuit fault. The abnormality type is more clearly identified, concise and clear, and the human-machine interaction is strong.

[0049] After the MCU automatically eliminates the first abnormal factor, the heating wire can work normally. At this time, the MCU can automatically control the gas generator in the blower drying device to work normally. The gas generator produces gas and generates hot air through the heating wire for blower drying. After eliminating this abnormal factor, the user does not need to manually start the gas generator in the blower drying device. The MCU controls the start-up automatically, which has a high degree of automation, avoids frequent user operation, and reduces user operation actions.

[0050] The determination of whether the calculated electrical parameters of the heating wire are within or within the preset threshold range can be made directly or indirectly. The calculated electrical parameters of the heating wire can be voltage or current parameters, and the preset threshold range can be either voltage or current. Under certain ambient temperatures, when the heating wire is exposed to water or metal debris, nails, etc., especially when this blower drying device is used to wash car floor mats, due to complex environments or improper operation, municipal water may enter the heating wire or metal debris, nails, etc., may fall onto the surface of the heating wire. In the above situations, according to the aforementioned analysis, the resistance value of the heating wire will be lower than its normal operating resistance value. When the first voltage is applied across the heating wire, the current passing through it will be higher than normal. Typically, the normal operating current value of the heating wire is set as a threshold range. When the calculated current parameter detected by the heating wire detection circuit exceeds the upper limit of this threshold range, that is, when it is outside the normal operating current threshold range, it indicates that the heating wire is short-circuited. When the voltage across the heating wire is detected, the calculated voltage parameters across the heating wire are obtained. In this embodiment, refer to... Figure 3 A voltage divider resistor R3 is connected in series with the heating wire. A first voltage is applied across the voltage divider resistor and the heating wire. Under normal operation, the resistance value of the heating wire is equal to the resistance value of the voltage divider resistor R3, and the voltage across the heating wire is equal to the voltage across the voltage divider resistor R3. When the heating wire is short-circuited, the voltage across the voltage divider resistor increases, while the voltage across the heating wire decreases. The normal operating voltage value of the heating wire is set to a threshold range. If the voltage across the heating wire is directly detected and fed back to the MCU, then if the calculated voltage parameter is smaller than or equal to the lower limit of the normal operating voltage threshold range, it indicates that the heating wire is short-circuited. Another detection method is to indirectly detect the voltage across the voltage divider resistor R3. If the voltage across the voltage divider resistor R3 is greater than the original normal operating value, it indirectly indicates that the heating wire is short-circuited. That is, if the calculated voltage parameter is smaller than or equal to the lower limit of the normal operating voltage threshold range, it also indicates that the heating wire is short-circuited. The threshold values ​​for the current parameter that allow the heating wire to operate normally can be either a range of current threshold values ​​or a fixed current threshold. Similarly, the threshold values ​​for the voltage parameter that allow the heating wire to operate normally can be either a range of voltage threshold values ​​or a fixed voltage threshold. When the heating wire is in the detection phase, the upper limit of the voltage threshold range that allows the heating wire to operate normally must be less than the applied first voltage value, or the fixed voltage threshold must be less than the applied first voltage value. Electrical parameters that are outside the threshold range or within the threshold values ​​for normal heating wire operation are generally referred to as abnormal heating wire electrical parameters.

[0051] Continue reading Figure 3The voltage converter C includes a signal conversion control circuit and a relay. The signal conversion control circuit includes a protection resistor R1, a pull-down resistor R2, a transistor b, and an electromagnetic coil. One end of the protection resistor R1 is connected to a signal output port RA5 of the MCU. The common point of the protection resistor R1 and the pull-down resistor R2 is connected to the base of the transistor. The emitter of the transistor b is grounded, and the collector of the transistor b is connected to the first voltage input terminal VCC through the electromagnetic coil. When the base voltage of transistor b is too high, the protection resistor R1 can limit the current to prevent excessive current from damaging the transistor b. In addition, the protection resistor R1 can also prevent the transistor b from generating excessive voltage changes during switching, thereby protecting the stability of the circuit. The pull-down resistor R2 prevents the base voltage from being pulled low when the signal logic level is abnormal, avoiding malfunction.

[0052] The relay is a double-pole double-throw relay, which includes pin 2, pin 3, pin 4, pin 5, pin 6, and pin 7. Pin 3 is selectively connected to conduct pin 2 or pin 4, and pin 6 is selectively connected to conduct pin 5 or pin 7. When the MCU outputs a high-level first signal to one end of the protection resistor R1, transistor b conducts. The voltage VCC passes through pin 1 and pin 8 of the electromagnetic coil, and then through the collector and emitter of the transistor to ground (GND), forming a conducting loop. Pin 2 and pin 3 of the double-pole double-throw relay are engaged, and pin 6 and pin 7 are engaged. The common node a of the voltage divider resistor R3 in the heating wire detection circuit B is connected to pin 7 of the double-pole double-throw relay, and conducts. After pin 7 conducts and pin 6 conducts, the heating wire 151 is connected in series, and then through pin 3 and pin 2 conducts and is grounded to GND, forming a loop. The common node a of the voltage divider resistor R3 is connected to pin MCU-IN1 of the MCU. At this time, the first voltage VCC-1 is applied across the heating wire and the voltage divider resistor R3, and the MCU receives the voltage value U at the common node a of the voltage divider resistor R3. C Since the resistance of the voltage divider resistor R3 is equal to the resistance of the heating wire during normal operation, let the resistance of the heating wire be RA, and the voltage of the first voltage VCC-1 be V1. According to the voltage divider formula... The fixed voltage threshold for heating wire 151 to operate normally is set as follows: Or voltage threshold range When water enters the heating wire 105, or when debris or iron nails fall into it, the heating wire 105 short-circuites. Based on the aforementioned analysis, the resistance R of the heating wire 105... A If it decreases, then the voltage parameter U is measured. a It will also become smaller, when or When the MCU determines that the heating wire has short-circuited. or When this happens, the MCU determines that the heating wire is open. The heating wire detection circuit uses a voltage-dividing resistor connected in series with the heating wire. The voltage-dividing resistor can limit the excessive current in the detection circuit. Apply a first voltage to the voltage-dividing resistor and the heating wire, and calculate the measured voltage parameter across the heating wire by voltage division through the voltage-dividing resistor. By detecting in the way of connecting the voltage-dividing resistor in series with the heating wire, the circuit is simple, with fewer required components and no complex control. Of course, in this part, a mature operational amplifier detection circuit and a current transformer can also be used to detect the current parameter and calculate the measured current parameter for comparison and judgment, which is also feasible. The above electrical parameters can also be compared in the way of current parameters.

[0053] When N×V1 < Ua < V1 / 2 or N×V1 < Ua < (V1 / 2 - △1), the MCU determines it as a general short circuit. When 0 ≤ Ua ≤ N×V1, the MCU determines it as a severe short circuit (where N is a number in the range of (0, 1), and specifically N is set as a number in the range of (0, 0.3)); when N1×V1 > Ua > V1 / 2 or N1×V1 > Ua > (V1 / 2 + △2), the MCU determines it as a general open circuit. When V1 ≥ Ua ≥ N1×V1 (where N1 is a number in the range of (0, 1), and N1 is set as a number in the range of [0.8, 1]), the MCU determines it as a severe open circuit. Here, N and N1 can be set as coefficients according to actual requirements, not limited to the above range. When the heating wire is completely short-circuited, the voltage U a at the common node a of the voltage-dividing resistor is 0, and at this time it is a severe short circuit. When the heating wire is completely disconnected, the voltage U a at the common node a of the voltage-dividing resistor is V1, and at this time it is a severe open circuit. Of course, when the heating wire has been used for a long time and becomes thin and long or breaks due to aging, it can also be detected whether it is a short circuit or an open circuit and its level. At this time, the machine needs to be disassembled to check the situation of the heating wire to troubleshoot the problem.

[0054] By comparing the measured voltage parameter with the lower threshold of the voltage parameter in the set voltage parameter threshold range or the voltage parameter threshold, and another set value greater than or equal to zero and less than the lower threshold of the voltage parameter or within the voltage parameter threshold range, to determine which interval it is in, thereby distinguishing the degree of short circuit and classifying the short circuit level, and thus obtaining the degree of short circuit abnormality. The short circuit abnormality detection result is more abundant and can meet the actual requirements.

[0055] By comparing the measured voltage parameters with the upper limit of the voltage parameter range or the voltage parameter threshold within the set voltage parameter threshold range, as well as another set value that is greater than the upper limit of the voltage parameter threshold or the voltage parameter threshold but less than or equal to the first voltage V1 range, the open circuit is determined to be in which range, thus classifying the degree of open circuit and determining the degree of open circuit anomaly. The open circuit anomaly detection results are more comprehensive, and users can judge the degree of open circuit in advance and take corresponding measures based on the open circuit detection level.

[0056] Since the heating wire is wound up one turn at a time, short circuits in the heating wire usually occur between turns. The aforementioned short circuit usually refers to a short circuit between the turns of the heating wire.

[0057] When the MCU determines that the heating wire is short-circuited of type 1, it issues a first warning signal; when the MCU determines that the heating wire is short-circuited of type 2, it issues a second warning signal; when the MCU determines that the heating wire is open-circuited of type 1, it issues a third warning signal; and when the MCU determines that the heating wire is open-circuited of type 2, it issues a fourth warning signal. Type 1 short circuit is a general short circuit, type 2 short circuit is a severe short circuit, type 1 open circuit is a general open circuit, and type 2 open circuit is a severe open circuit. When there is a general short circuit, the MCU controls the red light to illuminate once; when there is a severe short circuit, the MCU controls the red light to illuminate twice. When there is a general open circuit, the MCU controls the blue light to illuminate once; when there is a severe open circuit, the MCU controls the blue light to illuminate twice. Alternatively, the MCU can control the display screen to show "General Short Circuit" for general short circuits, "Severe Short Circuit" for severe short circuits, "General Open Circuit" for general open circuits, and "Severe Open Circuit" for severe open circuits, allowing for different warning prompts depending on the usage scenario.

[0058] When the MCU outputs a low-level second signal to one end of the protection resistor R1, transistor b is cut off, meaning the collector and emitter of transistor b are disconnected. The third pin 3 and fourth pin 4 of the double-pole double-throw relay are engaged, and the sixth pin 6 and fifth pin 5 are engaged. The heating wire detection circuit is disconnected, and AC-L and AC-N apply a second voltage, higher than the first voltage, to both ends of the heating wire 151 for normal operation. By default, when the blower drying device is first turned on, the MCU controls and applies a high-level first signal to the voltage converter. In this embodiment, transistor b is an NPN type, conducting at high levels and cutting off at low levels. After changing the circuit structure, a PNP type transistor can be used, cutting off at high voltages and conducting at low levels. Of course, a MOSFET can also be used to achieve the same function. The MCU sends a first or second signal to the voltage converter, which then applies a first voltage or a second voltage to the heating wire based on the signal. The first voltage is low, and the second voltage is high. This MCU-controlled voltage converter, which applies either a high or low voltage to the heating wire, is safer and simpler to control than directly applying a low or high voltage to the heating wire. Using a first voltage detection circuit instead of directly applying the second voltage would cause the heating wire to burn out, trip, or even potentially start a fire if the second voltage were applied directly without this detection circuit.

[0059] In this specific embodiment, the MCU-related power supply, filtering, and hardware reset are conventional circuits and are not shown in this diagram. The relay is a high-power double-pole double-throw relay (using the Hongfa brand, model HF115F / 005-2ZS3AFXXX) to meet the overcurrent requirements of the heating wire. The heating wire 151 has a power of 2200W, a voltage of 220V, and a room temperature resistance of 22Ω. R3 is set to 22Ω. The first voltage VCC-1 can be set to 5V. When the heating wire 151 is at its normal resistance value: MCU-I N1 connects to the MCU's AD function port, MCU-I N1 is divided to obtain the standard threshold of 2.5V. AC-L and AC-N are the L and N phases of the AC input. Q1 is an NPN transistor, which conducts when the MCU's RA5 outputs a high level. When the MCU's RA5 outputs a high level, Q1 conducts, and relay K1 is energized. At this time, HOT-A ​​is connected to RA (pins 6 and 7 of the relay are connected), and HOT-B is connected to RB (pins 3 and 2 of the relay are connected), (the heating wire resistance detection circuit is working). When the MCU's RA5 outputs a low level, the base of Q1 is pulled down to ground through R2, Q1 is cut off, relay K1 is disconnected, and HOT-A ​​is connected to AC-N (pins 6 and 5 of the relay are connected), and HOT-B is connected to AC-L (pins 3 and 4 of the relay are connected), (at this time, AC-L and AC-N are connected to the heating wire and work normally). Q1 is a conventional switching transistor, but a MOSFET can also be used. D1 is a reverse protection diode. R1 is a current-limiting resistor. R3 is a voltage divider detection resistor.

[0060] The voltage divider resistor R3 has a resistance of 22Ω. The spiral heating wire has 50 turns. When the heating wire 151 is working normally, the total resistance is calculated to be 22Ω. The resistance per turn (per loop) is 22 / 50 = 0.44Ω. The voltage threshold range when the heating wire 151 is working normally is set to [2.45V, 2.55V]. The second threshold is set to 1.5V and the third threshold is set to 4.5V.

[0061] When a metal fragment or nail falls into heating wire 151, a short circuit occurs between the two turns, and the total resistance of the heating wire becomes 22 - 0.44 = 21.56Ω. Through resistor R3 in series, according to the voltage divider formula, the theoretical detection value of the corresponding MCU-IN1 is 2.475V. When a nail is placed between the two turns of heating wire 151 to simulate a metal foreign object entering the heating wire, a first voltage of 5V is applied to the heating wire detection circuit for detection. The actual detection value received by the MCU-IN1 of the MCU is 2.478V. When iron filings are placed between the two turns of heating wire 151, and a first voltage of 5V is applied to the heating wire detection circuit for detection, the actual MCU-IN1... The detection value received by N1 is 2.471V, which is judged as an inter-turn short circuit anomaly. The actual detected voltage value is greater than 1.5V and less than 2.45V, specifically judged as a general short circuit anomaly. When a short circuit occurs between ten turns, the total resistance of heating wire 151 becomes 22 - (0.44 * 30) = 8.8Ω. Calculated using the voltage divider through resistor R3, the theoretical detection value of MCU-I N1 is 1.429V. When an iron nail is placed between thirty turns of heating wire 151 and a first voltage of 5V is applied to the heating wire detection circuit, the actual detection value received by MCU-I N1 of the MCU is 1.423V. When iron filings are placed between thirty turns of the heating wire and a first voltage of 5V is applied to the heating wire detection circuit, the actual MCU-I N1... The detected value received by N1 is 1.433V, while the actual detected voltage is less than 1.5V. At this point, it is specifically judged as a serious short circuit abnormality. When the MCU detects an inter-turn short circuit abnormality, it starts the gas generator to run the blowing for a certain period of time and detects the heating wire again. If the inter-turn short circuit is still detected, the alarm prompt program is started. If the inter-turn short circuit is detected to be cleared, it means that the abnormal metal debris has been removed by blowing, and the normal operation program is entered.

[0062] When a 5V detection voltage is applied to both ends of the heating wire detection circuit for actual testing, if moisture enters the heating wire (since the heating wire is placed horizontally), and a small amount of water is sprayed onto the surface of the heating wire 105 to simulate this environment, the actual detection voltage is 2.345V. Since the detected value is less than 2.45V but greater than 1.5V, the MCU judges it as a general short circuit anomaly. However, if a large amount of moisture enters the heating wire, and the actual testing simulates pouring a large amount of water onto the heating wire, the detection voltage is 1.4V. Since the detected value is less than 1.5V, the MCU judges it as a severe short circuit.

[0063] When the heating wire 151 is completely disconnected, the actual voltage detected when a 5V detection voltage is applied to both ends of the heating wire detection circuit is 4.989V, which is greater than 4.5V. At this time, the MCU judges it as a serious open circuit. When the heating wire 151 is slightly disconnected, in a state of being almost disconnected, the actual voltage detected when a 5V detection voltage is applied to both ends of the heating wire detection circuit is 3V, which is greater than 2.55V but less than 5V. At this time, the MCU judges it as a general open circuit.

[0064] Figure 4 The diagram shown is a schematic of the blower-drying device 1000 and the blower-drying module in Example 1 of the technical solution. (See attached diagram.) Figure 2 and Figure 3The air drying device 1000 includes a gas generator 10, a cover 20, a distributor 30, an air outlet 40, a housing 50, casters 60, and a cover 70. The casters 60 are fixedly mounted on the bottom surface of the housing 50, allowing the air drying device 1000 to be moved and turned easily. The casters 60 roll against the ground, saving effort. The cover 70 can be closed on top of the housing 50 and is hinged to the upper edge of the rear panel of the housing 50. When the air drying device 1000 is used to dry cleaned mats, it can be closed on top of the housing to prevent dust and debris from falling into the housing. The front panel of the cover 70 also has a handle 701, which allows the cover 70 to be flipped open and closed quickly and easily. The left and right side panels of the housing 50 are also equipped with ventilation openings 80. When the gas generator 10 is working, air can be drawn out from the ventilation openings 80 on both sides and enter through the air inlet 102 of the gas generator 10, flowing out through the air outlet 104 to generate fluid. The ventilation openings 80 on both sides can also be fitted with louvers to prevent dust and other contaminants from entering, or moisture-absorbing cotton can be installed to prevent heavy moisture from entering when air is drawn in and affecting the operation of the heating element 150, thereby avoiding leakage. In addition, the bottom plate of the housing 50 is hollow, so that the moisture generated when the air is blown to dry the pad 90 can flow out from the bottom to prevent water accumulation. The pad 90 is placed in the support module 100, which supports and holds the pad 90 to prevent it from moving. The specific shape and structure of the support module 100 are disclosed in CN220541591 U, and are incorporated herein by reference only.

[0065] See Figure 5 The blowing and drying device 1000 also includes a heating component 150. The gas generator 10 and the heating component 150 form a gas working module. The gas generator 10, the diverter 30 and the air outlet 40 are connected in sequence. The gas generator 10 generates hot air after passing through the heating component 150. The diverter divides the hot air to the air outlet 40. There are two air outlets 40, which are respectively arranged on both sides of the reciprocating motion mechanism.

[0066] See Figure 6The reciprocating motion mechanism includes a rack and pinion drive mechanism 120 and a sliding assembly 130. The rack and pinion drive mechanism 120 is connected to the sliding assembly 130. The controller communicates with the rack and pinion drive mechanism 120 and controls it to drive the sliding assembly 130 to move back and forth linearly, thus moving back and forth linearly with the gas generator. The gas generator 10 is fixed on the sliding assembly 130. When the sliding assembly 130 is driven to move back and forth linearly, the gas generator 10 moves back and forth linearly synchronously with the sliding assembly 130. Alternatively, the rack and pinion drive mechanism 120 can also be connected to the gas generator 10, in which case the gas generator 10 is fixed on the sliding assembly 130, and it can also be driven to move back and forth linearly synchronously with the sliding assembly.

[0067] The rack and pinion drive mechanism 120 includes a rack 121, a gear 122, a fixing plate 124, and a motor 123. The rack 121 is vertically fixed to the convex strip 141 of the base plate 142 of the frame 140. The gear 122 meshes with the rack 121. The motor 123 is fixed to the fixing plate 124 and is also rotatably connected to the gear 122. The sliding assembly 130 includes a slide rail 131 and a slider 132. The slider 132 is slidably connected to the slide rail 131. The slide rail 131 is fixed to the base plate 142 of the frame 140. Two slide rails are arranged on the left and right sides of the slide rail 131, and the sliders 132 are also arranged on the left and right sides respectively. The fixing plate 124 is fixed to the slider 132 (fixed by screws, which are shown in the figure). The base of the gas generator 10 is also fixed to the fixing plate 124.

[0068] See below Figure 9 Since the base of the gas generator 10 is fixed on the fixed plate 124, and the fixed plate 124 is fixed on the slider 132, and the motor 123 is fixed on the fixed plate 124, when the controller communicates with the motor 123 and controls the motor 123 to drive the gear 122 to rotate, the rotation of the gear 122 itself is converted into linear motion of the gear 122 on the rack 121, thereby driving the gas generator 10, the fixed plate 124, and the motor 123 to drive synchronously and smoothly. By controlling the speed of the motor through the controller, the speed of the linear motion of the gas generator can be controlled to meet the actual needs. The gas generator 10 generates hot air through the heating component 150. When the cleaned mat 90 is placed in the support module 100, the hot air moves back and forth on the surface of the mat 90 to cover the entire surface of the mat 90 and dry it. The gear and rack drive mechanism 120 is more stable, transmits greater power, has a longer lifespan, works stably, and can ensure a constant transmission ratio. It has a large load-bearing capacity, especially when the gas generator 10 is heavy, it can bear a large weight and move smoothly.

[0069] Furthermore, the tooth surface of the rack 121 is not facing upwards; instead, it is perpendicular to the plane where the sliding component 130 is located. This prevents dust and sand from falling into the tooth surface of the rack 121 during air drying, thus avoiding interference from dust and sand on the movement of the gear rack and ensuring smooth movement without interference.

[0070] See Figure 7 When the controller communicates with the gear and rack drive mechanism 120 in the reciprocating motion mechanism and controls the synchronous linear back and forth movement of the drive gas generator 10, the fixed plate 124 and the slider 132, the two ends of the bottom plate 142 of the frame 140 are also fixed with sensor 160 and sensor 270. The controller is electrically connected to sensors 160 and 170. When the rack and pinion drive mechanism 120 moves the air outlet 40 from the first position B1 to the second position B2 on the left, sensor 160 detects that the air outlet 40 has reached the first position B1 and sends a signal to the controller. The controller then drives motor 123 to rotate forward (opposite to the previous direction), and drive module 10 moves the air outlet 40 to the second position B2. At this time, sensor 170 detects that the air outlet 40 has reached the second position and sends a signal to the controller. The controller then drives motor 123 to rotate in reverse (opposite to the previous direction), and the rack and pinion drive mechanism 120 continues to drive the air outlet 40 to move in the opposite direction, thus forming a left-right linear reciprocating motion. This reciprocating motion, achieved by detecting the positions at both ends through two sensors, dries the mat 90 by blowing air. The sensors can be photoelectric sensors, optical sensors, magnetic Hall effect sensors, or proximity sensors, etc.; this invention does not limit the type of sensor. In a specific embodiment of the present invention, the sensor may be a diffuse reflection photoelectric sensor, model BX-552, brand Jingjiake; a metal proximity switch sensor, model PL-05N; or a through-beam photoelectric sensor, model E3F-20C1, brand Tushun Electric.

[0071] Continue reading Figure 8 and Figure 9The outlet of the gas generator 10 is fluidly connected to the distributor 30. After the distributor splits the air, it is fluidly connected to the air outlet 40. The two heating components 150 are respectively installed in the first distribution channel 31 and the second distribution channel 33, thus forming a blowing and drying module. The distributor 30 adopts a three-way pipe. Its main air inlet 31 is connected to the air inlet 104 of the blower gas generator 10. After the splitting, the first distribution channel 31 and the second distribution channel 33 are fluidly connected to the two air outlets 40 respectively. The angle A between the hot air flow direction of the distributor and the outlet air flow direction of the gas generator is greater than 90° and less than 180°, preferably between 110° and 155°, with an optimal angle of 135°. Other possible angles include 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, 126°, 127°, and 128°. The angles (29°, 130°, 131°, 132°, 133°, 134°, 136°, 137°, 138°, 139°, 140°, 141°, 142°, 143°, 144°, 145°, 146°, 147°, 148°, 149°, 150°, 151°, 152°, 153°, 154°, etc.) between the diverted flow direction and the horizontal direction OX are acute angles, and none are perpendicular to the horizontal direction OX. The fluid generated by the gas generator 10 passes through the heating component 150 to produce hot air. The diverter 30 smoothly transitions out from the hot air diversion point, minimizing collisions and obstructions between the fluid and the corners, resulting in minimal loss of hot air volume and pressure, ensuring that the air volume and pressure at the outlet of the gas generator 10 are essentially unaffected.

[0072] Return to reference Figure 5 The heating component 150 includes a heating wire 151 and a frame 152. The heating wire 151 is spirally wound around the outer periphery of the frame 152. The heating wire is generally about 2mm in diameter. Because of its small diameter, it reduces wind resistance and has high heat conversion efficiency. In contrast, the heating tube generally has a larger diameter, which greatly obstructs the wind. PTC heating methods generally have lower power and are difficult to install. The frame 102 adopts a cross-shaped frame and is placed vertically to further reduce wind resistance and reduce the loss of wind pressure and air volume.

[0073] See Figure 9 The controller also communicates with the gas generator 10 and the heating component 150 and controls the operation of the gas generator and the heating component 150. It can realize the start and stop control of the gas generator 10, the air volume and air pressure control, and the heating temperature control of the heating component 150. The electronic control is fast and convenient, meeting the actual needs.

[0074] Gas generator 10 produces hot air after passing through heating component 150. The heating component can be connected to the air inlet or outlet of the gas generator, or to the air outlet duct after the air is discharged. The gas generator is preferably an air pump, fan, or air compressor. When a fan is used instead of a gas generator, various types can be employed, such as cross-flow fans, centrifugal fans, comb fans, cross-flow fans, multi-blade fans, mixed-flow fans, and vortex fans. The fan structure can be based on Panasonic's patents JP1977072908A, JP1984008679B2, JP1985059491 B2, JP1983012694U, and JP1988010319B2, etc. The specific structure is described in detail in these patents and will not be repeated here. The fan in this technical solution is a CZR-370 model with an air volume of 840 m³ / h. 3 / s, weighing approximately 11kg, with a rotation speed of 2850rpm / min and an air pressure of 2100pa.

[0075] The air outlet can be made of high-temperature resistant materials to prevent the hot air from entering and causing thermoplastic deformation of the casing. PVC is preferred as it is easy to process and mold and is heat-resistant. The temperature of the hot air should generally not exceed 100°C, otherwise the pad may scorch during drying. As an alternative, the air duct can also be made of metal, such as stainless steel, cast aluminum, or aluminum alloy.

[0076] Figure 9This is the logic control diagram of the air-drying device in this technical solution. The controller sets the drying time of the air outlet, for example, 3 minutes. Within 3 minutes, the air outlet will move back and forth at a certain speed to dry the mat. It will automatically stop after the time is up. The air outlet also includes a temperature sensor and a humidity sensor. The temperature sensor and humidity sensor detect the temperature and humidity values ​​of the mat in real time. The detected temperature and humidity values ​​are transmitted to the controller and compared with temperature thresholds and humidity thresholds to determine the moisture and humidity on the mat surface, thereby controlling the start and stop of the air-drying device. The controller can also control the start and stop of the gas generator, the output power of the heating component, and the hot air outlet temperature. The controller is operated through an external control panel, which can be located on the top or front panel of the blower drying unit. The control panel displays the air temperature, air volume, and air pressure, as well as the blower drying time. The power button can start and stop the blower drying unit, and can be either a button or a knob. The temperature and air volume adjustment buttons can be used to adjust the temperature and air volume respectively. The control panel allows for stepless adjustment of temperature and air volume, enabling adjustment of the required outlet air temperature and air volume within any defined temperature and air volume range to meet the needs of drying different types of mats and mats with varying moisture content. Alternatively, the control panel can adjust the outlet air temperature and air volume in multiple levels, such as "high, medium, and low," to suit different scenarios, making it highly adaptable. The control panel uses an LCD touch screen to display temperature and air volume values, providing an intuitive and clear view.

[0077] A blower-drying device includes a memory that stores a program for detecting short circuit abnormalities between heating wire turns, as described above. The memory is integrated into a controller. After the program for detecting heating wire abnormalities is stored in the memory of the blower-drying device, the detection of heating wire abnormalities can be completed using the hardware of the blower-drying device itself, without the need for additional hardware.

[0078] A blower-drying device includes a circuit and a controller. The controller employs the heating wire anomaly detection method described above to detect the heating wire. After the controller detects the heating wire using the aforementioned method, it can automatically control and eliminate heating wire anomalies caused by the primary factor in advance. For heating wire anomalies caused by other reasons, an alert is issued. This blower-drying device has a high degree of automation, ensures normal equipment operation, eliminates personal safety hazards, requires no additional hardware, and can be controlled solely by software, making it highly commercially valuable.

[0079] As used herein for the purposes of this disclosure, the term "controller" is generally used to describe various means relating to the operation of a detection device, system, or method. A controller can be implemented in a variety of ways (e.g., with dedicated hardware) to perform the various functions discussed herein. A "microcontroller" is an example of a controller, which can be programmed with software (e.g., microcode such as C language) to perform one or more microprocessors to perform the various functions discussed herein. A controller can be implemented with or without a processor, and can also be implemented as a combination of dedicated hardware performing certain functions and a processor (e.g., one or more programmable microprocessors and associated circuitry) to perform other functions. Examples of controllers that may be employed in various embodiments of this disclosure include, but are not limited to, conventional microprocessors, application-specific integrated circuits (ASICs), and programmable gate PLCs. In various embodiments, a controller may be associated with one or more storage media (collectively referred to herein as "memory," such as volatile or non-volatile computer memory). In some embodiments, the storage media may be encoded with one or more programs that, when executed on one or more processors and / or the controller, perform at least some of the functions described herein. Various storage media may be fixed to or contained within the controller or control unit, or may be transportable, thereby allowing one or more programs stored therein to be loaded onto the controller or control unit to implement the various aspects discussed in this disclosure. The terms “program” or “computer program” are used herein in a general sense to mean any type of computer code (such as software or microcode) capable of being used to program one or more controllers or control units.

[0080] Although the invention has been described in detail with reference to specific preferred embodiments, variations and modifications exist within the spirit and scope of the invention as described and defined in the appended claims.

Claims

1. A method for detecting abnormal heating wire, comprising an MCU and a heating wire detection circuit, applied to a blower drying device, characterized in that, Step 1: Before the heating wire is working normally, a first voltage is applied to the heating wire detection circuit for a period of time. The heating wire detection circuit detects the electrical parameters at both ends of the heating wire at each sampling time obtained according to the sampling interval during the time period. Step 2: Based on the electrical parameters at both ends of the heating wire at each sampling time within the time period, obtain the measured electrical parameters representing the electrical parameters of the heating wire throughout the entire time period; Step 3: Determine the next action based on the comparison results between the calculated electrical parameters and the preset electrical parameter threshold range or threshold. Step 4: If the comparison result is that the measured electrical parameter is not within or outside the preset electrical parameter threshold range, then the heating wire is determined to be abnormal. The MCU controls the start of the gas generator in the blowing and drying device. The gas generator stops blowing after a predetermined time, and then steps 1, 2 and 3 are repeated. Step 5: After executing Step 4, if the measured electrical parameters are within or within the preset electrical parameter threshold range, the MCU will automatically eliminate the first abnormal factor. At this time, a second voltage higher than the first voltage can be applied to the heating wire to ensure normal operation. Step six: After executing step four, if the electrical parameters are still not within the preset electrical parameter threshold range or threshold, it indicates that the heating wire is still in an abnormal state, and the MCU issues an abnormal warning. The preset electrical parameter threshold range or threshold is determined based on the fact that the heating wire can work normally.

2. The heating wire abnormality detection method according to claim 1, characterized by, In step four, if the measured electrical parameter is not within or outside the preset electrical parameter threshold range, or if the measured electrical parameter is less than the lower limit threshold of the preset electrical parameter threshold range or less than the preset threshold, then the heating wire is determined to be short-circuited, and the MCU controls the start of the gas generator in the blowing and drying device to blow for a predetermined time.

3. The heating wire abnormality detection method according to claim 1, characterized in that, In step four, if the measured electrical parameter is not within or outside the preset electrical parameter threshold range, or if the measured electrical parameter is greater than the upper limit threshold of the preset electrical parameter threshold range or greater than the preset threshold, then the heating wire is determined to be open-circuited. The MCU prohibits the start of the gas generator in the blowing drying device, and steps one, two, and three are not repeated. The MCU directly issues an abnormal warning.

4. The heating wire abnormality detection method according to claim 2, characterized in that, The heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. Applying a first voltage to the heating wire detection circuit for a period of time means applying a first voltage to the voltage divider resistor and the heating wire. The measured electrical parameter is a measured voltage parameter. The preset electrical parameter threshold range or threshold is a voltage parameter threshold range or voltage parameter threshold. The first voltage is set to V1. If the measured voltage parameter is less than the lower limit of the preset voltage parameter threshold range and greater than N×V1, or if the measured voltage parameter is less than the preset voltage parameter threshold and greater than N×V1, the MCU determines that the heating wire is a first type of short circuit. If the measured voltage parameter is less than or equal to N×V1 and greater than or equal to zero, the MCU determines that the heating wire is a second type of short circuit, where N is a number in the interval (0, 1).

5. The heating wire abnormality detection method according to claim 3, characterized in that, The heating wire detection circuit uses a voltage divider resistor connected in series with the heating wire. Applying a first voltage to the heating wire detection circuit for a period of time means applying a first voltage to the voltage divider resistor and the heating wire. The measured electrical parameter is a measured voltage parameter. The preset electrical parameter threshold range or threshold is a voltage parameter threshold range or voltage parameter threshold. The first voltage is set to V1. If the measured voltage parameter is greater than the upper limit threshold of the preset voltage parameter threshold range and less than N1×V1, or if the measured voltage parameter is greater than the preset voltage parameter threshold and less than N1×V1, the MCU determines that the heating wire is a first type of open circuit. If the measured voltage parameter is greater than or equal to N1×V1 and less than or equal to V1, the MCU determines that the heating wire is a second type of open circuit, where N1 is a number in the interval (0, 1).

6. The heating wire abnormality detection method according to claim 1, characterized in that, After the MCU automatically eliminates the first abnormal factor and applies a second voltage higher than the first voltage to the heating wire to ensure normal operation, the MCU also automatically controls the gas generator in the blower drying device to work normally.

7. The heating wire abnormality detection method according to claim 1, characterized in that, It also includes a voltage converter, wherein the MCU sends a first signal to the voltage converter to apply a first voltage to the heating wire, or the MCU sends a second signal to the voltage converter to apply a second voltage to the heating wire.

8. The heating wire abnormality detection method according to claim 4 or 5, characterized in that, When the MCU determines that the heating wire is short-circuited of the first type, it issues a first warning signal; when the MCU determines that the heating wire is short-circuited of the second type, it issues a second warning signal; and / or when the MCU determines that the heating wire is open-circuited of the first type, it issues a third warning signal; when the MCU determines that the heating wire is open-circuited of the second type, it issues a fourth warning signal.

9. A blower drying device, comprising a memory, characterized in that, The memory stores the program for the heating wire abnormality detection method as described in any one of claims 1-8.

10. A blower drying device, comprising a circuit and a controller, characterized in that, The controller uses the heating wire abnormality detection method as described in any one of claims 1-8 to detect the heating wire.

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