Detection device and control method for curing barn equipment

Abstract

The invention discloses a curing barn equipment detection device and a control method, the curing barn equipment detection device comprises central control equipment, the central control equipment is connected with an alternating current voltage regulation and measurement circuit and / or a direct current measurement circuit, the alternating current voltage regulation and measurement circuit is connected with alternating current equipment of curing barn equipment, and the central control equipment controls the alternating current voltage regulation and measurement circuit to input corresponding voltage to the alternating current equipment. The central control equipment detects the voltage and current of the alternating-current equipment through an alternating-current voltage regulation and measurement circuit and calculates the resistance of the alternating-current equipment to judge whether the alternating-current equipment has faults or not; the direct-current measuring circuit is connected with direct-current equipment of curing barn equipment, the central control equipment controls the direct-current measuring circuit to input corresponding voltage to the direct-current equipment, and the central control equipment detects voltage and current of the direct-current equipment through the direct-current measuring circuit and calculates resistance of the direct-current equipment to judge whether the direct-current equipment breaks down or not. Fault detection of various devices of the curing barn is achieved through the central control device, detection is more detailed, and device faults are easier to find.

Description

Technical Field

[0001] This invention relates to the field of drying equipment testing and maintenance technology, and in particular to a testing device and control method for drying oven equipment. Background Technology

[0002] Curing barns, commonly used drying facilities for agricultural products such as tobacco leaves and grains, are widely used in rural areas. During the off-season, these barns are largely idle, and many rural areas lack professional maintenance personnel, resulting in a high equipment failure rate, typically exceeding 20% ​​annually. Before the curing season, users often need to conduct a comprehensive overhaul of the equipment. For example, in the tobacco curing industry, where biomass burners are primarily used for heating, manufacturers are usually required to conduct a unified overhaul of the equipment before the curing season. Current overhaul methods have the following problems:

[0003] (1) The drying room equipment includes multiple devices such as a burner, a cold air damper, a dry and wet bulb temperature sensor, and a blower. Among them, the DC equipment includes a cold air damper, a 24V DC slag discharge motor, and a 12V DC slag discharge motor; the AC equipment includes a feeding motor and a discharge motor; an ignition rod; a blower; an AC slag discharge motor; and a dry and wet bulb temperature sensor for temperature detection. In the existing technology, there is no unified central control equipment to centrally detect the DC equipment, AC equipment, and temperature detection equipment.

[0004] (2) The equipment for the baking room is often purchased from different manufacturers. Since the burner is one of the equipment with the highest failure rate and is also a relatively complex piece of equipment, the power supply and fuel supply of the baking room have not yet started before the start of the baking season. For burners without self-testing function, manufacturers can only perform simple and rough hardware checks and it is difficult to carry out operational tests, resulting in some failures not being discovered.

[0005] (3) High maintenance costs. Due to the large number of manufacturers and models of burners, it is necessary to contact multiple manufacturers to arrange for technicians to come and repair them, resulting in high labor costs.

[0006] (4) During the baking process, if the baking room equipment malfunctions, farmers on site will find it difficult to diagnose the malfunction themselves in the absence of professional technicians and fault detection equipment, which will make equipment maintenance difficult.

[0007] Therefore, it is evident that providing a simple-to-operate detection device that can quickly diagnose faults in drying room equipment has certain practical value. Summary of the Invention

[0008] In view of at least one deficiency of the prior art, the purpose of the present invention is to provide a detection device and control method for curing barn equipment, which realizes fault detection of various equipment in the curing barn through a central control device, and is an effective tool for curing barn equipment maintenance.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: It includes a central control device, which is connected to an AC voltage regulating and measuring circuit and / or a DC measuring circuit. The AC voltage regulating and measuring circuit is connected to the AC equipment of the drying oven. The central control device controls the AC voltage regulating and measuring circuit to input a corresponding voltage to the AC equipment. The central control device detects the voltage and current of the AC equipment and calculates its resistance to determine if there is a fault. A DC measuring circuit is connected to the DC equipment of the drying oven. The central control device controls the DC measuring circuit to input a corresponding voltage to the DC equipment. The central control device detects the voltage and current of the DC equipment and calculates its resistance to determine if there is a fault.

[0010] The DC measurement circuit includes a DC measurement module and a relay module. Both the DC measurement module and the relay module are connected to the central control equipment. One end of the relay module's switch SW1 is connected to a 24VDC power supply, and the other end of switch SW1 is connected to the input power supply terminal of the DC measurement module via resistor R2. Resistor R2 is connected in parallel with the relay module's switch SW4. One end of the relay module's switch SW2 is connected to a 12VDC power supply, and the other end of switch SW2 is connected to the common terminal of switch SW1 and resistor R2. The ground terminal of the DC measurement module is grounded. The output power supply terminal and ground terminal of the DC measurement module are connected to the DC equipment.

[0011] The AC voltage regulation and measurement circuit includes an AC voltage regulation module, an AC measurement module, and a relay module. All three modules are connected to a central control unit. The AC voltage regulation module's input live wire and input neutral wire are connected to the AC power supply. The AC voltage regulation module's output live wire is connected to the AC measurement module's input live wire via resistor R1. Resistor R1 is connected in parallel with the relay module's switch SW3. The AC voltage regulation module's output neutral wire is connected to the AC measurement module's input neutral wire. The AC measurement module's output live wire and output neutral wire are connected to the AC equipment.

[0012] To simplify the circuit, the DC measurement circuit and the AC voltage regulation and measurement circuit share a single relay module.

[0013] A cross switch circuit is also provided, which is equipped with a relay module. The central control equipment is connected to the relay module. The AC voltage regulating and measuring circuit is connected to the AC equipment of the baking oven through the cross switch circuit. The output terminal group of the AC voltage regulating and measuring circuit is connected to the intermediate node M1 and intermediate node M2 ​​respectively through the switches of the corresponding relay modules. The intermediate node M1 and intermediate node M2 ​​are then connected to the AC equipment through the switches of the corresponding relay modules. The DC measurement circuit is connected to the DC equipment of the baking oven via a cross switch circuit, including: the output terminal group of the DC measurement circuit is connected to intermediate node M1 and intermediate node M2 ​​through the switches of the corresponding relay modules, and intermediate node M1 and intermediate node M2 ​​are then connected to the DC equipment through the switches of the corresponding relay modules.

[0014] The central control unit is connected to a temperature measurement module, which in turn connects to the dry and wet bulb temperature sensors of the drying oven equipment. The dry and wet bulb temperature sensors consist of four sensors: the upper dry bulb temperature sensor, the upper wet bulb temperature sensor, the lower dry bulb temperature sensor, and the lower wet bulb temperature sensor. The central control unit reads the values ​​from the four temperature sensors through the temperature detection module and determines whether there is a malfunction based on the reading results. The testing process includes three fault detection steps: (1) Read the temperature values ​​of the four temperature sensors. If a temperature sensor does not return a temperature value, it indicates that the temperature sensor is faulty. (2) For a temperature sensor that reads the temperature value correctly, determine whether the temperature value of the temperature sensor is within a reasonable range. Here, the reasonable range is set to [0, T1], in degrees. If a temperature value exceeds this range, it indicates that the temperature sensor is faulty. (3) If all four temperature values ​​are read correctly and within a reasonable range, then determine whether the logical relationship between the temperature values ​​of the four temperature sensors is reasonable. If the logical relationship meets any of the following criteria, it indicates that there is a logical error in the logical relationship between the temperature values ​​of the temperature sensors. Logical condition 1: Upper dry-bulb temperature - Lower dry-bulb temperature ∉ [T2, T3];

[0015] Logical condition 2: Upper dry-bulb temperature - Lower dry-bulb temperature + Lower wet-bulb temperature - Upper wet-bulb temperature ∉ [T4, T5].

[0016] Preferably, T1 is 80, T2 is -4, T3 is 4, T4 is -2, and T5 is 2, in degrees. If the judgment logic does not meet any of these conditions, it indicates that the logical relationship of the temperature values ​​of the temperature sensor is correct.

[0017] A control method for a drying oven equipment testing device, wherein the DC device is equipped with a cold air damper and the cold air damper is equipped with a cold air damper motor, and the testing process includes the following steps: Step A1: The central control equipment detects short circuit and open circuit faults in the cold air damper. If the detection is normal, proceed to step A2; otherwise, determine that the cold air damper has a short circuit or open circuit fault and end. Step A2: The central control equipment detects a cold air damper angle reset fault. If the detection is normal, proceed to step A3; otherwise, determine that the cold air damper angle reset is faulty and end. Step A3: The central control equipment detects the cold air damper's travel cycle fault. If the detection is normal, the cold air damper is determined to be working normally, and the process ends; otherwise, the cold air damper's travel cycle is determined to be faulty, and the process ends. Step A1 includes connecting the output power terminal of the DC measurement module to intermediate node M1 via relay module switch SW10, and connecting intermediate node M1 to the positive terminal of the cold air damper motor via relay module switch SW24; connecting the ground terminal of the DC measurement module to intermediate node M2 ​​via relay module switch SW11, and connecting intermediate node M2 ​​to the negative terminal of the cold air damper motor via relay module switch SW27; Step A1 for detecting short circuit and open circuit faults includes the following steps: Step A11: The central control equipment first disconnects all switches of the relay module, and then closes switches SW1, SW10, SW11, SW24 and SW27 of the relay module. The 24VDC power supply is then supplied to the cold air door motor through resistor R2 and then through the DC measurement module. Step A12: The central control equipment reads the voltage and current through the DC measurement module, calculates the resistance of the cold air door motor, and then disconnects switches SW1, SW10, SW11, SW24 and SW27. Step A13: The central control equipment judges the detection results as follows: if the resistance of the cold air damper motor is greater than its open circuit resistance threshold, it is judged as an open circuit fault of the cold air damper motor; if the resistance of the cold air damper motor is less than its short circuit resistance threshold, it is judged as a short circuit fault of the cold air damper motor; otherwise, it is judged as normal for open circuit and short circuit detection; End. Step A2 includes connecting intermediate node M1 to the negative terminal of the cold air damper motor via switch SW26 of the relay module; connecting intermediate node M2 ​​to the positive terminal of the cold air damper motor via switch SW25 of the relay module; Step A2 for detecting angle reset faults includes the following steps: Step A21: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25 and SW26 of the relay module to power the cold air door motor with 12VDC power and reverse it. Wait 3 seconds. Step A22: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW24, and SW27 to power the cold air door motor with 12VDC and make it rotate in the forward direction. Step A23: The central control equipment reads its current through the DC measurement module, records it as the forward and stall current, and waits for 1 second; Step A24: The central control equipment reads its current through the DC measurement module, records it as the forward running current, and waits for 1 second; Step A25: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25, and SW26 to power the cold air door motor with 12VDC and reverse it. Step A26: The central control equipment reads the current through the DC measurement module, records it as the reverse stall current, and waits for 1 second; Step A27: The central control equipment reads the current of the cold air damper motor through the DC measurement module, records it as the reverse operation current, and waits for 5 seconds; Step A28: The central control unit disconnects all switches of the relay module to complete the reverse reset; Step A29: The central control equipment determines whether the angle reset is normal (i.e., whether the proportional relationship between the forward running current, forward stall current, reverse running current, and reverse stall current is normal); if not, it is determined that the angle reset is faulty and the process ends; if yes, it is determined that the angle reset is normal and the process ends. Step A29 includes the following: when the forward operating current, forward stall current, reverse operating current, and reverse stall current meet any of the following conditions, the cold air damper angle reset fault is considered to be present. Condition a. Forward running current / Reverse running current ∉ [0.95, 1.05]; Condition b. Forward stall current / Reverse stall current ∉ [0.95, 1.05]; Condition c. Forward running current / Forward stall current ∉ [0.35, 0.85]; Condition d. Reverse running current / reverse stall current ∉ [0.35, 0.85]; Step A3, detecting stroke cycle faults, includes: Step A31: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW24, and SW27 to power the cold air door motor with 12VDC and make it rotate in the forward direction. Start timing and wait for 1 second. Step A32: The central control equipment reads and records the current of the cold air damper motor through the DC measurement module; Step A33: The central control device determines whether the cold air damper motor is stalled. If so, record the forward rotation cycle; proceed to step A35; if not, proceed to step A33. Step A33: The central control device determines whether the cold air damper motor has timed out. If not, proceed to step A32; if yes, proceed to step A34. Step A34: The central control equipment determines that the forward rotation cycle has timed out; Step A35: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25, and SW26 to power the cold air door motor with 12VDC and reverse it. The timing restarts, and the device waits for 1 second. Step A36: The central control equipment reads and records the current of the cold air damper motor through the DC measurement module; Step A37: The central control device determines whether the cold air damper motor is stalled. If yes, record the reverse stroke cycle and proceed to step A39; if no, proceed to step A38. Step A38: The central control device determines whether the cold air damper motor has timed out in reverse. If not, proceed to step A36. If so, the central control device determines that the reverse stroke cycle of the cold air damper motor has timed out; Step A39: The central control unit disconnects all switches of the relay module and determines whether the stroke cycle of the cold air damper motor is normal; if not, the central control unit determines that the stroke cycle of the cold air damper motor is faulty; if yes, the central control unit determines that the stroke cycle of the cold air damper motor is normal and ends. If the test result meets any of the following conditions, it is determined to be a stroke cycle failure of the cold air door motor; a. Forward rotation cycle ∉ [3, 6] (unit: seconds); b. Reverse stroke period ∉ [3, 6] (unit: seconds); c. Forward stroke cycle / Reverse stroke cycle ∉ [0.9, 1.1].

[0018] A control method including the aforementioned detection device for curing barn equipment, wherein the DC equipment is equipped with a DC slag discharge motor, pins 8 and 12 of the burner interface CN7 are respectively connected to the positive and negative terminals of the slag discharge motor, the output power terminal of the DC measurement module is connected to intermediate node M1 via relay module switch SW10, intermediate node M1 is connected to pin 8 of the burner interface CN7 via relay module switch SW14, and intermediate node M1 is also connected to pin 12 of the burner interface CN7 via relay module switch SW22; the ground terminal of the DC measurement module is connected to intermediate node M2 ​​via relay module switch SW11, intermediate node M2 ​​is connected to pin 8 of the burner interface CN7 via relay module switch SW15, and intermediate node M2 ​​is also connected to pin 12 of the burner interface CN7 via relay module switch SW23.

[0019] The main process for detecting faults in DC slag discharge motors includes the following steps: Step E1: The central control equipment checks whether the DC slag discharge motor has a short circuit fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a short circuit fault, and the process ends; otherwise, proceed to step E2. Step E2: The central control equipment checks whether the DC slag discharge motor has a reset fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a reset fault, and the process ends; otherwise, proceed to step E3. Step E3: The central control equipment checks whether the DC slag discharge motor has a stroke cycle fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a stroke cycle fault, and the process ends; otherwise, it is determined that the DC slag discharge motor is working normally, and the process ends. Step E1, the central control equipment detects a short circuit fault in the DC slag discharge motor, including the following steps: Step E11: The central control equipment first disconnects all switches of the relay module, then closes switches SW1, SW10, SW11, SW14, and SW23. The DC 24V power supply is then supplied to the DC slag discharge motor through resistor R2 and the DC measurement module. Step E12: The central control equipment reads the voltage and current of the DC slag discharge motor through the DC measurement module chip, calculates the resistance of the DC slag discharge motor, and then disconnects all switches of the relay module. Step E13: The central control equipment determines whether the resistance of the DC slag discharge motor is normal. If it is less than the short-circuit resistance threshold, it determines that the DC slag discharge motor has a short-circuit fault and ends; otherwise, it determines that the short-circuit detection of the DC slag discharge motor is normal and ends. Step E2, the central control equipment's detection of a DC slag discharge motor reset fault, includes the following steps: Step E21: The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW15, and SW22 to power the DC slag discharge motor with DC12V and start timing. Step E22: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E23: The central control equipment determines whether the current of the DC slag discharge motor is zero. If it is, it determines that the DC slag discharge motor reset is normal and proceeds to step E27; otherwise, it proceeds to step E24. Step E24: The central control equipment determines whether the current of the DC slag discharge motor is normal. If it is, proceed to step 25; if not, proceed to step E26. Step 25: The central control equipment determines whether the DC slag discharge motor has timed out. If not, proceed to step E22; if yes, proceed to step E26. Step 26: The central control equipment determines that the DC slag discharge motor has a reset fault; Step E27: The central control unit disconnects all switches of the relay module, ending the process; Step E3, the central control equipment's detection of DC slag discharge motor stroke cycle faults, includes the following steps: Step E31: The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW14, and SW23 to power the DC slag discharge motor with DC12V and make it rotate in the forward direction, and starts timing; Step E32: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E33: The central control equipment determines whether the current of the DC slag discharge motor is zero. If yes, proceed to step E36; otherwise, proceed to step E34. Step E34: The central control equipment determines whether the current of the DC slag discharge motor is normal. If not, proceed to step E41; if yes, proceed to step E35. Step E35: The central control equipment determines whether the forward rotation of the DC slag discharge motor has timed out. If not, proceed to step E32; if yes, proceed to step E41. Step E36: ​​The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW15, and SW22 to power the DC slag discharge motor with DC12V and reverse it, and starts timing. Step E37: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E38: The central control equipment determines whether the current of the DC slag discharge motor is zero; if yes, it determines that the DC slag discharge motor reset is normal and proceeds to step E42; if no, it proceeds to step E39. Step E39: The central control equipment determines whether the current of the DC slag discharge motor is normal. If not, proceed to step E41; if yes, proceed to step E40. Step E40: The central control equipment determines whether the DC slag discharge motor reverse rotation has timed out. If not, proceed to step E37; if yes, proceed to step E41. Step E41: The central control equipment determines that the DC slag discharge motor has a reset fault; Step E42: The central control unit disconnects all switches of the relay module, and the process ends.

[0020] If the DC slag discharge motor can reset normally within the stroke cycle in both forward and reverse rotation, then the stroke cycle of the DC slag discharge motor is considered normal.

[0021] The key to the control method of the detection device for the drying room equipment is that the timeout judgment logic is that the DC slag discharge motor runs continuously in one direction for more than 45 seconds, and the current has not reached 0; the normal operating current range of the DC slag discharge motor is [0.5, 2.5], in amperes; the time from one end to the other, i.e. the stroke cycle, does not exceed the set time range, and the stroke cycle is [5, 45], in seconds.

[0022] A control method including the aforementioned oven equipment detection device, the key features of which are: the AC equipment is equipped with a feeding motor and a discharging motor; pins 1 and 2 of the burner interface CN7 are respectively connected to the live wire and neutral wire of the feeding motor; the output live wire of the AC measurement module is connected to one end of the switch SW5 of the relay module; the other end of the switch SW5 is connected to pin 1 of the burner interface CN7 via node P1; the output neutral wire of the AC measurement module is connected to node P246; pin 2 of the burner interface CN7 is connected to node P246; pins 7 and 2 of the burner interface CN7 are respectively connected to the live wire and neutral wire of the discharging motor; the output live wire of the AC measurement module is connected to one end of the switch SW8 of the relay module; the other end of SW8 is connected to intermediate node M1; intermediate node M1 is connected to pin 7 of the burner interface CN7 via the switch SW12 of the relay module. The main testing process for the feeding motor and the unloading motor is the same, including the following steps: Step B1: Detect short circuit and open circuit faults; Determine if short circuit and open circuit are normal. If not, determine if there is a short circuit or open circuit fault and end; if yes, proceed to step B2. Step B2: Detect stall faults; Determine if the stall detection is normal. If not, determine if there is a stall fault; if yes, determine if the stall detection is normal. The procedure for detecting short circuit and open circuit faults in the feed motor includes the following steps: Step BA1: The central control equipment first disconnects all switches of the relay module, then closes switch SW5. The AC voltage regulator module supplies power to the feed motor through resistor R1 and then through the AC measurement module; the AC voltage regulator module outputs 10% of the rated voltage. Step BA2: The central control equipment reads the voltage and current of the feed motor through the AC measurement module, calculates the resistance of the feed motor, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module to shut off its output. Step BA3: The central control equipment checks whether the resistance value of the feeding motor is normal. If it is greater than the open circuit resistance threshold of the feeding motor, the feeding motor is determined to be open circuit fault, and the process ends; if it is less than the short circuit resistance threshold of the feeding motor, the feeding motor is determined to be short circuit fault, and the process ends; otherwise, the open circuit and short circuit detection of the feeding motor are determined to be normal. The procedure for detecting short circuit and open circuit faults in the unloading motor includes the following steps: Step BB1: The central control equipment first disconnects all switches of the relay module, then closes switches SW8 and SW12. The AC voltage regulator module supplies power to the unloading motor through resistor R1 and then through the AC measurement module; the AC voltage regulator module outputs 10% of the rated voltage. Step BB2: The central control equipment reads the voltage and current of the unloading motor through the AC measurement module, calculates the resistance of the unloading motor, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module to shut off its output. Step BB3: The central control equipment checks whether the resistance value of the unloading motor is normal. If it is greater than the open circuit resistance threshold of the unloading motor, the unloading motor is determined to be open circuit fault, and the process ends; if it is less than the short circuit resistance threshold of the unloading motor, the unloading motor is determined to be short circuit fault, and the process ends; otherwise, the open circuit and short circuit detection of the unloading motor are determined to be normal. Step B2, detecting stall faults, includes the following steps: Step B21: The central control equipment first disconnects all switches of the relay module, then closes switches SW3 and SW5, and the AC voltage regulator module outputs 100% of the rated voltage, so that the working voltage of the feeding motor is AC220V, and the timing starts. Step B22: The central control equipment reads the current of the feed motor through the AC measurement module and records its current value; Step B23: The central control equipment determines whether the feed motor has timed out. If not, proceed to step B22; if yes, proceed to step B24. Step B24: The central control equipment determines whether the feed motor is stalled. If so, it runs the alternating operation process of the feed motor and the unloading motor and ends; if not, it proceeds to step B25. Step B25: The central control equipment first disconnects all switches of the relay module, then closes switches SW3, SW8, and SW12. The AC voltage regulator module outputs 100% of the rated voltage, making the working voltage of the unloading motor AC220V, and the timing begins. Step B26: The central control equipment reads its current through the AC measurement module and records the current value; Step B27: The central control equipment determines whether the unloading motor has timed out. If not, proceed to step B26; if yes, proceed to step B28. Step B28: The central control equipment determines whether the unloading motor is stalled. If yes, it runs the alternating operation process of the feeding motor and the unloading motor, and ends; if no, it proceeds to step B29. Step B29: The central control equipment determines that there is no material blockage fault in the feeding motor and the unloading motor, and ends; The timeout period is set to 10 seconds, and the stall current is set to 0.9A. The stall judgment logic is: within 1 second before the timeout, that is, between the 9th and 10th seconds after the start of the timing, the current always exceeds 0.9A. The control method for the baking oven equipment detection device, wherein the alternating operation process of the feeding motor and the unloading motor includes the following steps: Step BC1: The central control equipment starts timing, causing the feeding motor and the unloading motor to run according to the alternating operating status data, cyclically reading and recording the current, and disconnecting all switches of the relay module when it ends; Step BC2: The central control equipment determines whether the feeding motor and the unloading motor are stalled. If not, it determines that there is no stall fault in the feeding motor and the process ends; if yes, proceed to step BC3. Step BC3: The central control equipment determines whether the alternating operation of the feeding motor and the unloading motor has exceeded the limit. If not, proceed to step BC1; if yes, proceed to step BC4. Step BC4: The central control equipment determines that the feed motor and the unloading motor still have a stall fault, and ends; Stall current detection logic: During the last alternating operation in the alternating operation data, the current of the feeding motor or the unloading motor during operation always exceeds the stall current, i.e., 0.9A; Excessive operation detection logic: Repeat the alternating operation data 5 times; When the feeding motor is running, the unloading motor stops; when the feeding motor stops, the unloading motor runs. This includes a set number of alternating processes, with the alternating interval time gradually increasing from short to long, forming an alternating operation state. The feeding motor operates as follows: run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 4 seconds, stop for 4 seconds; run for 4 seconds, stop for 4 seconds; run for 8 seconds, stop for 8 seconds; run for 8 seconds, stop for 8 seconds. The corresponding unloading motor operates as follows: stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 4 seconds, run for 4 seconds; stop for 4 seconds, run for 4 seconds; stop for 8 seconds, run for 8 seconds; stop for 8 seconds, run for 8 seconds.

[0023] Alternatively, the switching interval can be adjusted based on the measured stall current. The larger the measured stall current, the shorter the average alternation interval. If the stall current is greater than 1A, the operating status is as follows: The feeding motor's operating status is: run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 4 seconds, stop for 4 seconds; run for 4 seconds, stop for 4 seconds. The corresponding unloading motor's operating status is: stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 4 seconds, run for 4 seconds; stop for 4 seconds, run for 4 seconds.

[0024] The key to the control method of the aforementioned curing barn equipment detection device lies in the following: the AC equipment is also equipped with an AC slag discharge motor, which is equipped with a forward motor and a reverse motor. Pins 9 and 10 of the burner interface CN7 are respectively connected to the live wire and neutral wire of the reverse motor. The output live wire of the AC measurement module is connected to one end of the switch SW8 of the relay module. The other end of the switch SW8 is connected to one end of the switch SW16 of the relay module via intermediate node M1. The other end of the switch SW16 is connected to pin 9 of the burner interface CN7. The output neutral wire of the AC measurement module is connected to one end of the switch SW9 of the relay module. The other end of the switch SW9 is connected to one end of the switch SW19 of the relay module via intermediate node M2. The other end of the switch SW19 is connected to pin 10 of the burner interface CN7. Pins 11 and 10 of the burner interface CN7 are connected to the live wire and neutral wire of the forward motor, respectively. The other end of the switch SW8 is also connected to one end of the relay module switch SW20 via intermediate node M1. The other end of the switch SW20 is connected to pin 11 of the burner interface CN7. The fault detection methods for the forward motor and the reverse motor are the same as those for the feed motor and the retractor motor.

[0025] A control method including the aforementioned oven equipment detection device, the key features of which are: the AC equipment is equipped with an ignition rod, and pins 3 and 4 of the burner interface CN7 are respectively connected to the live wire end and the neutral wire end of the ignition rod; the output live wire end of the AC measurement module is connected to one end of the switch SW6 of the relay module, the other end of the switch SW6 is connected to node P3, node P3 is connected to pin 3 of the burner interface, and the output neutral wire end of the AC measurement module is connected to node P246, and node P246 is connected to pin 4 of the burner interface; The main process for detecting heating rod malfunctions includes the following steps: Step C1: The central control unit detects the cold resistance of the ignition rod. If the cold resistance is abnormal, the ignition rod resistance detection is determined to be faulty, and the process ends; if the cold resistance detection is normal, proceed to step C2. Step C2: The central control unit detects the hot resistance of the ignition rod. If the hot resistance detection is abnormal, the ignition rod resistance detection is determined to be faulty, and the process ends; if the hot resistance detection is normal, the ignition rod resistance detection is determined to be normal. Step C1, which involves the central control equipment detecting the cold resistance of the ignition rod, includes the following steps: Step C11: The central control unit first disconnects all switches of the relay module, then closes switch SW6. The AC voltage regulator module supplies power to the ignition rod through resistor R1 and then through the AC measurement module. The AC voltage regulator module outputs 10% of the rated voltage. Step C12: The central control unit reads the voltage and current of the ignition rod through the AC measurement module, calculates the cold resistance of the ignition rod, and then disconnects all switches of the relay module. The central control unit controls the AC voltage regulation module to shut off its output. Step C13: The central control unit determines whether the cold resistance of the ignition rod is normal. If the cold resistance of the ignition rod is greater than its open circuit resistance threshold, it is determined that the ignition rod is open circuit faulted and the process ends. If the cold resistance of the ignition rod is less than its short circuit resistance threshold, it is determined that the ignition rod is short circuit faulted and the process ends. Otherwise, it is determined that the cold resistance of the ignition rod is normal and the process ends. Step C2, which involves the central control equipment detecting the hot resistance of the ignition rod, includes the following steps: Step C21: The central control unit first disconnects all switches of the relay module, then closes switches SW3 and SW6 to power the ignition rod with the output voltage of the AC voltage regulating module and starts the timing. Step C22: The central control equipment reads the voltage and current of the ignition rod through the AC measurement module, and adjusts the output voltage of the AC voltage regulator module to make its current reach the constant current target; Step C23: The central control unit determines whether the ignition rod power-on timeout has occurred. If yes, proceed to step C26; if no, the central control unit calculates the ignition rod power and proceeds to step C24. Step C24: The central control unit determines whether the ignition rod exceeds the set power limit; if not, proceed to step C22; if yes, proceed to step C25. Step C25: The central control unit reads the voltage and current of the ignition rod through the AC measurement module, adjusts the output voltage of the AC voltage regulator module to make the power of the ignition rod reach the limit power; proceed to step C22; Step C26: The central control unit calculates the hot resistance of the ignition rod; Step C27: The central control unit determines whether the hot resistance of the ignition rod is normal. If the hot resistance of the ignition rod is greater than the upper limit of the hot resistance, it is determined that the ignition rod power is too low and the process ends. If the hot resistance of the ignition rod is less than the lower limit of the hot resistance, it is determined that the ignition rod power is too high and the process ends. Otherwise, the ignition rod power is determined to be normal and the process ends.

[0026] The key to the control method of the oven equipment detection device is as follows: the short-circuit resistance threshold of the ignition rod in the cold state is set to 30 ohms, and the open-circuit resistance threshold in the cold state is set to 150 ohms; the allowable range of the hot resistance of the ignition rod is set to [80, 132], in ohms; the constant current target is 3A, the power limit is 400W, and the timeout time is 120 seconds.

[0027] A control method including the aforementioned oven equipment detection device, the key features of which are: the AC equipment is equipped with a blower, pins 5 and 6 of the burner interface CN7 are respectively connected to the live wire and neutral wire of the blower, the output live wire of the AC measurement module is connected to one end of the switch SW7 of the relay module, the other end of the switch SW7 of the relay module is connected to node P5, node P5 is connected to pin 5 of the burner interface CN7, the output neutral wire of the AC measurement module is connected to node P246, and node P246 is connected to pin 6 of the burner interface CN7; The main process for detecting blower malfunctions includes the following steps: Step D1: The central control equipment detects short circuit and open circuit faults in the blower. If the detection is abnormal, it is determined that the blower has a short circuit or open circuit fault, and the process ends; if the detection is normal, proceed to step D2. Step D2: The central control equipment detects blower operating current faults. If the detection is abnormal, the blower operating current is determined to be faulty, and the process ends; if the detection is normal, the blower is determined to be working normally, and the process ends. Step D1, the process for detecting short circuit and open circuit faults in the central control equipment for the blower, includes the following steps: Step D11: The central control unit first disconnects all switches of the relay module, then closes switch SW7. The AC voltage regulator module supplies power to the blower through resistor R1 and then through the AC measurement module; the AC voltage regulator module outputs 10% of the rated voltage. Step D12: The central control equipment reads the voltage and current of the blower through the AC measurement module, calculates the blower resistance, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module output to shut off. Step D13: The central control equipment determines whether the resistance of the blower is normal. If the resistance of the blower is greater than its open circuit voltage threshold, it is determined that the blower has an open circuit fault and the process ends. If the resistance of the blower is less than its short circuit voltage threshold, it is determined that the blower has a short circuit fault and the process ends. Otherwise, it is determined that the open circuit and short circuit detection of the blower are normal and the process ends. Step D2, the central control equipment detects blower operating current faults, including: The central control unit first disconnects all switches of the relay module, then closes switches SW3 and SW7 of the relay module to supply power to the blower via the AC voltage regulating module. The central control unit adjusts the blower's operating voltage through the AC voltage regulating module, dividing the voltage from the starting voltage to the maximum voltage into N stages, where N is greater than or equal to 2. The voltage gradually increases according to a set step size, and the set step size increases gradually, with a fixed running time for each step size. After the maximum voltage running time is reached, the blower voltage is restored to zero. Each stage has a current acquisition time period. During the current acquisition time period, the central control equipment reads the blower's operating current through the AC measurement module, takes the current within M seconds before the voltage step as the steady-state current, and determines whether it is within the steady-state current range. If it is not within the steady-state current range, it is determined that there is an operating current fault. If it is within the steady-state range, further determine whether the current fluctuation amplitude during the current acquisition period exceeds the set amplitude threshold. If it exceeds the amplitude threshold, determine that its operating current is faulty. If it does not exceed the amplitude threshold, further determine whether the steady-state operating current of the blower increases step by step with the working voltage. If not, determine that its operating current is faulty; if so, determine that its operating current is normal.

[0028] The key to the control method of the oven equipment detection device is as follows: the blower operating current detection process includes the following steps: Step D21: The central control device disconnects all switches of the relay module, closes switches SW3 and SW7, and enables the AC voltage regulating module to supply power to the blower; Step D22: The central control device adjusts the output voltage of the AC voltage regulating module to make its output voltage the voltage of the next stage, and starts timing; Step D23: During the current acquisition period, the central control device reads the blower operating current through the AC measurement module and records its current value until the end of this stage; Step D24: The central control device determines whether the current is normal. If it is not normal, it determines that the operating current is faulty and ends; if it is normal, proceed to step D25; Step D25: The central control device determines whether it is the final voltage stage. If not, proceed to step D22; if yes, proceed to step D26; Step D26: The central control device controls the output of the AC voltage regulating module to shut off, and the central control device controls the relay module to disconnect all switches; Step D27: The central control device determines that the blower operating current is normal and ends.

[0029] N is 4, and the voltage values ​​for the four stages are [80, 90, 110, 160], in volts, with step sizes of 10, 20, and 50 respectively. The running time for each stage is 20 seconds. M is 5, and the steady-state current range is [0.3, 1.5], in amperes. If the current fluctuation exceeds 10% during the current acquisition period, it exceeds the amplitude threshold and is judged as a blower operating current fault.

[0030] Significant effects: This invention provides a detection device and control method for curing barn equipment. It enables fault detection of various equipment in the curing barn through a central control device, making the detection more detailed and easier to find equipment faults. It is an effective tool for the maintenance of curing barn equipment. Attached Figure Description

[0031] Figure 1 A circuit module structure diagram of the testing device for the drying room equipment; Figure 2 A schematic diagram showing the external connections of the testing device for the drying oven equipment; Figure 3 This is a connection structure diagram of the main components of the testing device for the drying room equipment; Figure 4 Circuit diagram for AC voltage regulation and measurement circuit; Figure 5 This is a circuit diagram of a DC measurement circuit. Figure 6 This is a diagram of the burner interface and its peripheral circuitry. Figure 7 This is a circuit module diagram of the central control equipment and its connection interfaces; Figure 8 This is a circuit diagram of the relay module and its connection interfaces. Figure 9 This is a circuit diagram of the temperature measurement module and its connection interface. Figure 10 This is a circuit module structure diagram of the power supply module; Figure 11 This is a flowchart of the operation steps of the detection device; Figure 12 This is a sequence diagram for equipment fault detection; Figure 13 Main flowchart for detecting temperature sensor faults; Figure 14 Main flowchart for detecting cold air damper malfunctions; Figure 15 A flowchart for detecting short circuit and open circuit faults in cold air dampers; Figure 16 A flowchart for detecting a cold air damper reset fault; Figure 17 A flowchart for detecting a fault in the travel cycle of a cold air damper; Figure 18 The main flowchart for detecting faults in the feed motor and unloading motor; Figure 19 Flowchart for detecting short circuit and open circuit faults in the feed motor; Figure 20 Flowchart for detecting short circuit and open circuit faults in the unloading motor; Figure 21 Flowchart for detecting stall faults in the feed motor and unloading motor; Figure 22 A flowchart for detecting the alternating operation of the feed motor and the unloading motor; Figure 23 This is a schematic diagram showing the alternating operation curves of the feed motor and the unloading motor; Figure 24 Main flowchart for detecting heating rod malfunctions; Figure 25 Flowchart for detecting short circuit and open circuit faults in a cold ignition rod; Figure 26The operating curve is used to test the hot resistance of the ignition rod; Figure 27 Flowchart for detecting the hot resistance of the ignition rod; Figure 28 Main flowchart for detecting blower malfunctions; Figure 29 Flowchart for detecting short circuit and open circuit faults in blowers; Figure 30 This is a schematic diagram of the working voltage variation curve of the blower; Figure 31 This is a schematic diagram showing the time period for collecting blower current. Figure 32 Flowchart for detecting blower operating current; Figure 33 Main flowchart for detecting AC slag discharge motor faults; Figure 34 Flowchart for detecting short circuit and open circuit faults in the forward motor; Figure 35 Flowchart for detecting short circuit and open circuit faults in the reversing motor; Figure 36 Flowchart for detecting stall faults in AC slag discharge motors; Figure 37 Flowchart for detecting alternating operation of forward and reverse motors; Figure 38 A schematic diagram showing the alternating operation curves of the forward and reverse motors; Figure 39 Main flowchart for detecting DC slag discharge motor faults; Figure 40 Flowchart for detecting short-circuit faults in DC slag discharge motors; Figure 41 Flowchart for detecting DC slag discharge motor reset fault; Figure 42 Flowchart for detecting periodic faults in DC slag discharge motors. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-42 As shown, this invention relates to a testing device and control method for curing barn equipment. This invention uses a single testing device to detect faults in multiple pieces of equipment in the curing barn, and is compatible with mainstream models of burners and other curing barn equipment on the market. The testing process data is automatically saved and uploaded to a platform, making it an effective tool for curing barn equipment maintenance. At the same time, the technical status of the curing barn and the quality of the manufacturer's equipment can be accurately grasped based on the platform data.

[0034] 1. External Connections of the Detection Device

[0035] External connection relationships of the detection device are as follows Figure 2 As shown, the equipment being tested includes a burner, a blower (circulating fan), a cold air damper, and a dry-bulb and wet-bulb temperature sensor. The test results are sent to the platform, which allows for remote parameter setting and software updates.

[0036] Note: This invention applies to both coal-fired and biomass curing barns. The equipment in a coal-fired curing barn includes a blower, a cold air damper, and dry-bulb and wet-bulb temperature sensors, while the equipment in a biomass curing barn includes a burner, a cold air damper, and dry-bulb and wet-bulb temperature sensors. Because the burner integrates a blower, a feed motor, a discharge motor, an ignition rod, and a slag discharge motor, the testing requirements for biomass curing barn equipment include those for coal-fired curing barn equipment. Therefore, this invention only discusses the testing of biomass curing barn equipment. The curing barn equipment testing device is detachably connected to the aforementioned curing barn equipment.

[0037] 2. Main components of the detection device

[0038] like Figures 1-10 As shown, the detection device is centered around a central control unit, with peripheral circuits consisting of various hardware functional modules and power supply modules. The central control unit is connected to an AC voltage regulating and measuring circuit and / or a DC measuring circuit. The AC voltage regulating and measuring circuit connects to the AC equipment of the drying oven, controlling the central control unit to input the corresponding voltage to the AC equipment. The central control unit then uses the AC voltage regulating and measuring circuit to detect the voltage and current of the AC equipment and calculate its resistance to determine if there is a fault. The DC measuring circuit connects to the DC equipment of the drying oven, controlling the central control unit to input the corresponding voltage to the DC equipment. The central control unit then uses the DC measuring circuit to detect the voltage and current of the DC equipment and calculate its resistance to determine if there is a fault. The AC voltage regulating and measuring circuit includes an AC voltage regulating module and an AC measuring module; the DC measuring circuit includes a DC measuring module.

[0039] (1) Central control equipment: Industrial configuration screens or industrial smart screens can be selected, combining the functions of touch screen, control board, and communication module. The touch screen is used for human-machine interaction, the control board is used to communicate with peripheral functional modules and execute detection actions, and the communication module is used to send the detection process data to the Internet of Things (IoT) platform. Current detection technologies lack process records. During the manufacturer's detection process, there is generally no supervision, making it difficult for users to accurately evaluate the detection process and results, such as how many devices were tested, what faults were found, and whether the faults were repaired in accordance with regulations. The inability to obtain accurate records of the drying room's technical status hinders the selection of high-quality suppliers and fails to provide a reliable basis for formulating and revising equipment technical standards. By sending the detection process data to the IoT platform, it is easier to supervise and evaluate the detection process and results.

[0040] The industrial configuration screen uses the TPC1031NT configuration screen, which is 10.1 inches in size, 1024×600 pixels, 800MHz main frequency, 128M memory, RS485×2 interfaces, RS232×1 interfaces, and adopts 4G communication.

[0041] (2) Power supply modules: including DC24V power supply, DC12V power supply, and central control equipment power supply. The DC24V and DC12V power supplies are used to power the various functional modules, slag discharge motor, and cold air door, while the central control equipment power supply is used to power the central control equipment. The central control equipment is powered separately to prevent failures of peripheral functional modules and curing equipment from affecting the normal operation of the central control equipment. Since the three AC / DC power supply modules are conventional and mature technologies, their specific models and circuit diagrams are omitted.

[0042] (3) DC Measurement Module: Collects the voltage and current of DC equipment, including the cold air damper and DC slag discharge motor, as a basis for judging whether they are faulty. DC Measurement Module: Uses ZS-DCC1 DC voltage and current acquisition module, RS485 interface, voltage accuracy 0.1%, current accuracy 2%.

[0043] (4) AC Measurement Module: Collects the voltage and current of AC equipment, including the feed motor, discharge motor, ignition rod, blower, and AC slag discharge motor, as a basis for judging whether they are faulty. AC Measurement Module: Uses ZS-ACS1 single-phase AC voltage and current acquisition module with RS485 interface, voltage accuracy 0.1%, current accuracy 2%.

[0044] (5) Relay Module: Contains several relay switches, positioned between the power supply and the equipment in the circuit connection. Based on the pin order of the drying oven equipment, certain relay switches are turned on and off according to certain rules to ensure correct connection and disconnection of the power supply and equipment. For example, if the cold air door is powered by DC12V, the positive and negative terminals of the DC12V power supply need to be connected to both ends of the cold air door according to a certain procedure to achieve forward rotation, reverse rotation, and stop of the cold air door. The relay module model is ZS-HF32, a 32-channel single-pole single-throw relay with a rated current of 8A, a rated voltage of 250VAC / 30VDC, an RS485 interface, and MODBUS communication protocol. Figures 4-6 In the diagram, SW1-SW27 are the switches for the relay module.

[0045] (6) AC voltage regulation module: AC equipment is generally powered by AC220V during operation. This invention adjusts the output voltage according to the needs of different stages of the detection process to achieve functions such as reducing power consumption, measuring resistance, detecting short circuits, and overcurrent protection. Among them, the AC voltage regulation module adopts the YF-73 AC voltage regulation module. The YF-73 AC voltage regulation module is a 220V thyristor stepless voltage regulation control module with RS485 control interface, rated current of 5A, and voltage regulation PWM range of 0-100%.

[0046] (7) Temperature measurement module: reads the temperature value of the wet and dry bulb temperature sensor and judges whether it is faulty according to certain rules; Temperature measurement module: its model is DAM-DS04, which is a 4-channel DS18B20 temperature acquisition module with RS485 interface, acquisition frequency of 10Hz, resolution of 0.0625℃, and built-in digital filtering algorithm to eliminate interference.

[0047] 3. Detection device circuit; circuit principle is shown in [link to circuit diagram]. Figures 4-10 .

[0048] (1) The central control equipment and each functional module are connected by RS485 communication. The network labels in the circuit diagram are A and B. CN1~CN6 are the interfaces between each RS485 functional module and the central control equipment.

[0049] (2) Figures 4-10 Each switch represents a relay switch in the relay module, which supplies power to the curing oven equipment through a certain combination of switch states (see the detection process of each device below).

[0050] (3) The burner integrates a blower, a feed motor, a discharge motor, an ignition rod, and a slag discharge motor. The burner interface CN7 has 12 pins, of which pins 5 and 6 are blower pins and are connected to socket U3 for testing the blower in the coal-fired oven.

[0051] (4) Power supply interface U1 is an AC220V power input interface. Network label L is the live wire and N is the neutral wire. AC220V is output through three AC / DC modules to output DC24V power, DC12V power and central control equipment power respectively.

[0052] (5) The wet and dry bulb temperature sensor is connected to the temperature measurement module, and the temperature measurement module sends the measurement results to the central control equipment.

[0053] 4. Relay module connection circuit

[0054] (1) Overall structure: The AC220V power supply passes through the AC voltage regulation module, then through the circuit consisting of resistor R1 and switch SW3 in parallel, the AC measurement module, and the cross switch circuit, and connects to the burner and the cold air damper. The DC24V and DC12V power supplies are selected as DC power supplies by switches SW1 and SW2 respectively, and then pass through the circuit consisting of resistor R2 and switch SW4 in parallel, the DC measurement module, and the cross switch circuit, and connect to the burner and the cold air damper.

[0055] (2) A circuit with a resistor and a switch connected in parallel has two operating states:

[0056] When the switch is off, a resistor is connected to prevent excessive current from causing power failure in the event of a short circuit in the subsequent circuit.

[0057] When the switch is turned on, the parallel resistor is short-circuited, and the power supply path bypasses the resistor, directly supplying power to the subsequent circuits.

[0058] (3) Cross switch circuit

[0059] A cross switch circuit connects the AC power supply's live wire and neutral wire, and the DC power supply's positive and negative terminals, respectively, to intermediate nodes (network labels M1 and M2) via switches. These intermediate nodes are then connected to the drying oven equipment interface via switches. Figures 4-6 Several switches: SW8~SW27. The intermediate nodes have only two power supply options, as shown in the table below.

[0060] Table of power supply combinations for cross switch circuits

[0061] Serial Number Network label M1 Network label M2 1 Fireline neutral wire 2 DC positive terminal DC negative terminal

[0062] The reason for using a cross-switch circuit is to enable the detection of different burner models, as their pin orders are not entirely the same. The pin orders of several common burner models are shown in the table below:

[0063] Feeding indicates the feeding motor, ignition indicates the ignition rod, blowing indicates the blower, DC slag discharge indicates the DC slag discharge motor, slag discharge backward indicates the AC slag discharge backward motor, and slag discharge forward indicates the AC slag discharge forward motor; L indicates the live wire, N indicates the neutral wire, + indicates the DC positive terminal, and - indicates the DC negative terminal.

[0064] As can be seen from the table, the pin order of the different models of feeding motor, ignition rod, and blower is consistent, including 6 pins: feeding L, feeding N, ignition L, ignition N, blower L, and blower N. However, the corresponding pin order of the unloading motor and slag discharge motor is not exactly the same.

[0065] Common Combustion Engine Interface Pin Sequence Table

[0066]

[0067] 5. Operating Procedures for the Detection Device

[0068] The preparation work before operation involves powering on the testing device and connecting it to the drying oven equipment. The central control unit of the testing device has a touch screen, which is used for operation. The steps are as follows: Figure 11 As shown, it includes 3 steps:

[0069] (1) Selecting the burner model: The testing device software saves the known burner models and their configuration parameters on the market. A burner model selection list is provided on the operation interface. The testing personnel select the corresponding model on the operation interface according to the burner model installed in the curing barn.

[0070] (2) Start Testing: There is a "Start Testing" button on the touch screen interface. After clicking, the testing device will automatically test the drying oven equipment in sequence. The equipment testing sequence is as follows: Figure 12 As shown, this order conforms to the arrangement habits of most manufacturers and users.

[0071] (3) Output test results: After testing all the oven equipment, save the test results, display them on the touch screen interface, and send the test data (time, location, model, test process data, fault data) to the platform through the communication module.

[0072] After the test is completed, disconnect the connection between the curing oven equipment and the testing device. If you need to continue testing other curing oven equipment, connect the equipment for the next curing oven and repeat steps 1-3 above. Otherwise, turn off the power to the testing device and end the testing work. The equipment fault testing sequence is as follows: Figure 12 As shown.

[0073] 6. Testing the wet and dry bulb temperature sensor

[0074] The dry-bulb and wet-bulb temperature sensor system comprises four temperature sensors: the upper dry-bulb temperature sensor, the upper wet-bulb temperature sensor, the lower dry-bulb temperature sensor, and the lower wet-bulb temperature sensor. The central control unit reads the values ​​from these four temperature sensors via a temperature detection module and determines whether any sensor is malfunctioning based on the readings.

[0075] The main process for detecting sensor faults is as follows: Figure 13 As shown, it includes three fault detection steps:

[0076] (1) Read the temperature values ​​of the four temperature sensors. If a temperature sensor does not return a temperature value, it indicates that the temperature sensor is faulty.

[0077] (2) For sensors that correctly read temperature values, determine whether the temperature value of the temperature sensor is within a reasonable range. Here, the reasonable range is set to [0, 80], in degrees. If a temperature value exceeds this range, it indicates that the temperature sensor is faulty.

[0078] (3) If all four temperature values ​​are read correctly and within a reasonable range, then determine whether the relationship between the temperature values ​​of the four temperature sensors is reasonable. If the judgment logic meets any of the following criteria, it indicates that the temperature sensor temperature relationship logic is faulty.

[0079] Upper shed dry bulb temperature - lower shed dry bulb temperature ∉ [-4, 4]

[0080] Upper shed dry bulb temperature - lower shed dry bulb temperature + lower shed wet bulb temperature - upper shed wet bulb temperature ∉ [-2, 2]

[0081] Note: Current oven controllers lack fault diagnosis functions based on temperature value relationships, and there is no universally accepted, clearly defined judgment logic in the industry. The judgment logic of this invention takes into account the oven's baking status, idle status, and temperature sensor water shortage status, and is used to diagnose common sensor value relationship faults.

[0082] 7. Inspect the air conditioning door

[0083] The air damper is driven by a DC motor and comes with accessories such as a gearbox, coupling, and blades. It operates at a DC voltage of 12V. The air damper motor has two pins, which are connected to the positive and negative terminals of the DC power supply, respectively. Switching the power supply direction changes the direction of motor rotation, thereby increasing or decreasing the damper angle.

[0084] The main flow of the procedure for detecting cold air door faults is as follows: Figure 14 As shown, the content includes three aspects: detecting short circuit and open circuit faults, detecting angle reset faults, and detecting stroke cycle faults.

[0085] (1) Detecting short circuit and open circuit faults. The procedure for detecting short circuit and open circuit faults in the cooling damper is as follows: Figure 15 As shown. The method involves calculating the resistance by measuring the voltage and current. The resistance R2 in the circuit is much larger than the motor resistance. After power is applied, the motor will not rotate and there is no back electromotive force. Based on the formula resistance = voltage / current, the motor resistance can be calculated.

[0086] The judgment logic is as follows:

[0087] If the resistance is greater than the open-circuit resistance threshold, then it is an open-circuit fault;

[0088] If the resistance is less than the short-circuit resistance threshold, then it is a short-circuit fault.

[0089] Based on the technical characteristics of current mainstream air conditioning door products, the short-circuit resistance threshold is set at 12 ohms and the open-circuit resistance threshold is set at 48 ohms.

[0090] Note: DC24V was used instead of DC12V during short-circuit fault detection to increase the voltage and current of the DC motor of the cold air damper, thereby improving measurement accuracy.

[0091] (2) Detect angle reset fault. The procedure is as follows: Figure 16 As shown. The method involves rotating the air vent motor forward and backward in a specific sequence, measuring the forward operating current, forward stall current, reverse operating current, and reverse stall current during this process. If any of the following conditions are met, the air vent is considered faulty. (This corresponds to the normal current judgment in the "Air Vent Reset Fault Detection Procedure")

[0092] a. Forward operating current / Reverse operating current [0.95, 1.05], theoretically should be 1. The allowable error of 5% is to take into account the measurement error of the current sensor. If it exceeds the allowable range, it is generally because there is mechanical jamming or transmission interruption in one of the rotation directions.

[0093] b. Forward locked rotor current / Reverse locked rotor current [0.95, 1.05], theoretically should be 1. The allowable error of 5% is to take into account the measurement error of the current sensor. If it exceeds the allowable range, it means that the direction with the smaller stall current is not truly stalled, but rather there is mechanical jamming.

[0094] c. Forward running current / Forward stall current [0.35, 0.85], the operating current must be less than the stall current, and the ratio range is determined based on the parameters of the mainstream air vents currently on the market.

[0095] d. Reverse running current / Reverse stall current [0.35, 0.85], for the same reason as in point c.

[0096] Note: The communication time of the relay module and DC measurement module used in this invention is much longer than the freewheeling time of the motor current; therefore, the freewheeling time of the motor current is ignored in the flowchart. Based on the operating characteristics of current air vents on the market, the air vent will stop immediately after all switches are disconnected. That is, the inertial gliding time after power failure is comparable to the communication time of the relay module; therefore, the start-stop time of the motor is ignored in the flowchart.

[0097] (3) Detect stroke cycle faults. The running time between the closed and fully open states of the cold air damper is the stroke cycle, including the forward cycle (from closed to fully open) and the reverse cycle (from fully open to closed). A reasonable stroke time range is set to [3,6], in seconds. The detection process is as follows: Figure 17 As shown, the stall condition is determined when the current is approximately equal to the stall current. For example, during forward rotation, if the current reaches within 100 ± 5% of the forward stall current, it is considered stalled, meaning the forward rotation stroke timing ends. The timeout condition is determined when the timing reaches the longest stroke cycle, i.e., exceeding 6 seconds.

[0098] This detection method measures both the forward and reverse rotation periods simultaneously and compares them, resulting in a more comprehensive analysis.

[0099] A trip cycle failure is defined as meeting any of the following conditions.

[0100] a. Forward rotation cycle ∉ [3, 6] Unit: seconds.

[0101] b. Reverse travel period ∉ [3, 6] Unit: seconds.

[0102] c. Forward stroke cycle / Reverse stroke cycle ∉ [0.9, 1.1].

[0103] Additional information: There is a more stringent fault diagnosis method. If, during the current detection process, the current fluctuation during operation (from 1 second after startup to 1 second before stall) exceeds a certain percentage, such as 10%, then the cold air damper drive is considered unstable, which is a precursor to mechanical failure.

[0104] 8. Inspect the feed motor and the unloading motor.

[0105] The feed motor and unloading motor are single-phase AC motors, sharing a neutral wire connected to pin 2. Burner interface pins 1 and 2 connect to the feed motor, corresponding to network labels P1 and P246 in the circuit diagram. The pin corresponding to the unloading motor's live wire varies depending on the burner model; for example, the live wire for the unloading motor of the YJRS-160 burner is pin 7, and the neutral wire is connected to P2. This example will be used here. Switch SW13 of the relay module is spare.

[0106] The main detection process is as follows: Figure 18 As shown, the content includes two parts: detecting short circuit and open circuit faults, and detecting stall faults.

[0107] (1) Detect short circuit and open circuit faults. Test the two motors in sequence. The testing process for the feeding motor and the unloading motor is the same, except that the switches of the control pins are different. The flowchart is as follows. Figure 19 , Figure 20 As shown. Based on the technical characteristics of current mainstream feeding motor products, the short-circuit resistance threshold is set to 30 ohms, and the open-circuit resistance threshold is set to 90 ohms. The same settings are applied to the unloading motor. The value of resistor R1 in the circuit is much larger than the motor resistance. After power is applied, the motor will not rotate, there is no back electromotive force, and the reactance factor is ignored. The motor resistance is calculated according to the formula: Resistance = Voltage / Current.

[0108] If the resistance is greater than the open-circuit resistance threshold, then it is an open-circuit fault.

[0109] If the resistance is less than the short-circuit resistance threshold, then it is a short-circuit fault.

[0110] (2) Detecting stall faults

[0111] When the feed motor is running, the feed auger rotates forward; when the unloading motor is running, the feed auger rotates in reverse. Feed motor stalling is a common fault, and its detection and troubleshooting are challenging. Because the fuel in biomass burners is solid cylindrical pellets, some of which have high hardness and toughness, or contain impurities such as stones, if these get stuck in the gap between the feed auger and the feed hopper, it can easily cause the motor to stall. In practice, it often requires manual cleaning of the feed hopper after the machine is stopped to detect and troubleshoot the problem. Furthermore, because the unloading function is rarely used, its existence is often overlooked, and it is generally not checked.

[0112] This invention combines the detection of the feeding motor and the unloading motor, with the two operating and stopping alternately, offering the following advantages:

[0113] a. By utilizing the impact force generated during the forward and reverse rotation of the feeding auger, and through repeated impacts, hard biomass pellets are cut off, thus self-repairing the stall fault and reducing manual repairs.

[0114] b. By using the forward and reverse rotation of the feeding auger, the position of impurities such as biomass pellets and stones will be continuously adjusted through back-and-forth squeezing and impact. After multiple attempts, the feeding hopper may be restored to unobstructed flow, and the blockage fault can also be repaired by itself, reducing manual repair.

[0115] The process for detecting stall in the feed motor and unloading motor is as follows: Figure 21 As shown, the timeout period is 10 seconds and the stall current is 0.9A.

[0116] The logic for determining stall is that the current always exceeds 0.9A within 1 second before the timeout (i.e., between the 9th and 10th seconds after the start of the timing).

[0117] The process for detecting the alternating operation of the feed motor and the unloading motor is as follows: Figure 22 As shown.

[0118] Locked rotor detection logic: During the last alternating operation in the alternating operation curve, the current of the feeding motor or the unloading motor when it is powered on always exceeds the locked rotor current, i.e., 0.9A.

[0119] Excessive judgment logic: The alternating running curve is repeated 5 times.

[0120] A schematic diagram of the alternating operation curve is shown below. Figure 23 As shown, when the feeding motor is running, the unloading motor stops. When the feeding motor stops, the unloading motor runs, which includes several alternating processes. The alternation interval time gradually increases from short to long, forming an alternating operation curve.

[0121] For example: the operating status of the feed motor is:

[0122] Run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds;

[0123] Run for 4 seconds, stop for 4 seconds; run for 4 seconds, stop for 4 seconds; run for 8 seconds, stop for 8 seconds; run for 8 seconds, stop for 8 seconds.

[0124] The corresponding operating status of the unloading motor is as follows:

[0125] Stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds;

[0126] Stop for 4 seconds, run for 4 seconds; stop for 4 seconds, run for 4 seconds; stop for 8 seconds, run for 8 seconds; stop for 8 seconds, run for 8 seconds.

[0127] In addition, the switching interval can be adjusted according to the measured locked-rotor current. The larger the measured locked-rotor current, the shorter the average alternation interval. For example, if the locked-rotor current is greater than 1A, the following adjustment should be made.

[0128] The operating status of the feed motor is as follows:

[0129] Run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second;

[0130] Run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds;

[0131] Run for 4 seconds, then stop for 4 seconds; run for 4 seconds, then stop for 4 seconds.

[0132] The corresponding operating status of the unloading motor is as follows:

[0133] Stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 1 second, run for 1 second;

[0134] Stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds;

[0135] Stop for 4 seconds, then run for 4 seconds; stop for 4 seconds, then run for 4 seconds.

[0136] 9. Test the ignition rod

[0137] The ignition rod is essentially a resistor; its function is to heat up the surrounding combustible material by resisting resistance, thus igniting it. Pins 3 and 4 of the burner interface are connected to the ignition rod, corresponding to network labels P3 and P246 in the circuit diagram.

[0138] The main detection process is as follows: Figure 24 As shown, the content includes two parts: detecting cold resistance and detecting hot resistance.

[0139] (1) Detecting cold resistance

[0140] The process for determining cold-state resistance by calculating resistance using voltage and current is as follows: Figure 25 As shown. Based on the technical characteristics of current mainstream ignition rod products, the short-circuit resistance threshold is set to 30 ohms, and the open-circuit resistance threshold is set to 150 ohms, that is, the allowable range of cold resistance is [30, 150], in ohms. The ignition rod resistance is calculated according to the formula resistance = voltage / current.

[0141] If the ignition rod resistance is greater than the open circuit resistance threshold, then it is an open circuit fault.

[0142] If the ignition rod resistance is less than the short-circuit resistance threshold, then it is a short-circuit fault.

[0143] (2) Detecting hot resistance

[0144] The resistance of the ignition rod is not fixed, but increases with temperature. In actual operation, the ignition rod is in a high-temperature state, so it is also necessary to test the hot resistance of the ignition rod.

[0145] To reduce the operating power of the testing equipment, this invention proposes a constant current + power limiting control method under conditions where there is no blower for cooling the ignition rod. The operating curve is shown below. Figure 26 As shown, the hot resistance of the ignition rod is dynamically measured. If the hot resistance exceeds the allowable range, the ignition rod is considered faulty. The procedure for testing the hot resistance of the ignition rod is as follows: Figure 27 As shown. Based on current mainstream products, the allowable range of hot resistance is set to [80, 132], in ohms. The constant current target in the process is 3A, the power limit is 400W, and the timeout is 120 seconds.

[0146] 10. Inspect the blower

[0147] The blower is a single-phase AC motor. The burner interface pins 5 and 6 are connected to the blower, corresponding to network labels P5 and P246 in the circuit diagram.

[0148] The main process for detecting blower malfunctions is as follows: Figure 28 As shown, the content includes two parts: detecting short circuit and open circuit faults, and detecting operating current faults.

[0149] (1) Detect short circuit and open circuit faults in the blower. The detection procedure is as follows: Figure 29 As shown. Based on the technical characteristics of current mainstream blower products, the short-circuit resistance threshold is set to 15 ohms, and the open-circuit resistance threshold is set to 90 ohms. The resistance R1 in the circuit is much larger than the motor resistance; therefore, the motor will not rotate after power is applied, and there is no back electromotive force. Ignoring the reactance factor, the blower resistance is calculated according to the formula: Resistance = Voltage / Current.

[0150] If the resistance is greater than the open-circuit resistance threshold, then it is an open-circuit fault.

[0151] If the resistance is less than the short-circuit resistance threshold, then it is a short-circuit fault.

[0152] (2) Detect the operating current

[0153] Because of the differences in volt-ampere characteristics between different models of blowers, a combined method of judging current range under multiple voltage operating conditions, current fluctuation, and current trend is adopted to test different models of oven blowers. The advantage of this testing method is that it takes into account factors such as judging the effective voltage regulation range of the blower, judging resonance and surge, and judging operating characteristics.

[0154] The blower's operating voltage is adjusted via an AC voltage regulator module. The voltage increase from the starting voltage to the maximum voltage is divided into several stages, with the voltage gradually increasing in non-fixed steps. The running time for each step can be fixed. Here, the voltage values ​​are taken as [80, 90, 110, 160] volts, corresponding to steps of 10, 20, and 50 volts, with a running time of 20 seconds for each voltage. The voltage change curve is shown in the diagram below. Figure 30 As shown, after the operating time at the highest voltage ends, the voltage will be restored to zero.

[0155] Current range determination refers to whether the steady-state operating current of the blower remains within a certain range. Because the motor accelerates when the voltage increases dramatically, the current also increases dramatically; therefore, it is necessary to wait for the current to stabilize before taking a measurement. Figure 31 As shown, the current within a few seconds (e.g., 5 seconds) before the voltage step is taken as the steady-state current. The steady-state current range is [0.3, 1.5], and the unit is amperes.

[0156] Current fluctuation judgment refers to whether the blower maintains a stable current under stable operating conditions. Mechanical failures, surges, and obstructed airflow can cause current instability. The judgment logic here is that if the current fluctuation exceeds 10% within the current acquisition period, the motor is considered to be malfunctioning.

[0157] Current trend judgment refers to the observation that the steady-state operating current of the blower increases with the increase of the operating voltage. As the operating voltage increases, it is determined whether the steady-state operating current of the motor also increases accordingly. For example, the average current collected at 160V should be higher than the average current collected at 110V. The process for detecting the blower's operating current is as follows: Figure 32 As shown.

[0158] 11. Test the AC slag discharge motor

[0159] Different manufacturers and models of burners may use different slag discharge motors. Currently, there are three types of slag discharge motors on the market: AC slag discharge motors, 24V DC slag discharge motors, and 12V DC slag discharge motors.

[0160] The slag discharge motor is connected to the slag discharge push rod or push plate. The motor drives the push rod or push plate to move forward and backward to clean up the combustion waste slag.

[0161] The AC slag discharge motor consists of a forward motor and a reverse motor. Both motors are single-phase AC motors and share a common neutral wire. Therefore, the fault detection method is the same as that for the feeding motor and the unloading motor.

[0162] The burner interface pins corresponding to the AC slag discharge motor vary depending on the model. Taking the SWMS-IZ model as an example, pins 9, 10, and 11 are the live wire of the slag discharge backward motor, the neutral wire of the slag discharge motor, and the live wire of the slag discharge forward motor, respectively.

[0163] The main detection process is as follows: Figure 33 As shown, the content includes two parts: detecting short circuit and open circuit faults, and detecting stall faults.

[0164] (1) Detect short circuit and open circuit faults. The forward and reverse motors are tested sequentially, following the same procedure, except that the switches on the control pins are different, such as... Figure 34 and Figure 35 As shown. Based on the technical characteristics of current mainstream slag removal motors, the short-circuit resistance is set to 60 ohms and the open-circuit resistance to 240 ohms. The resistance R1 in the circuit is much larger than the motor resistance; therefore, the motor will not rotate after power is applied, and there is no back electromotive force. Ignoring the reactance factor, the motor resistance is calculated using the formula: Resistance = Voltage / Current.

[0165] If the resistance is greater than the open-circuit resistance, then it is an open-circuit fault.

[0166] If the resistance is less than the short-circuit resistance, then it is a short-circuit fault.

[0167] (2) Detecting stall faults

[0168] Slag discharge motor stalling is the most common fault in burners. This is because biomass fuels have a wide variety of raw materials and complex compositions, resulting in hard impurities and gels after combustion, which can easily cause the slag discharge motor to jam. In practice, it is often necessary to shut down the machine and manually clean the slag discharge channel to detect and troubleshoot the problem.

[0169] This invention performs joint testing on the forward and reverse motors in the AC slag discharge motor, and the testing process is similar to that of the feeding motor and the unloading motor.

[0170] The testing process is as follows Figure 36 As shown, the timeout period is set to 30 seconds and the stall current is set to 0.3A.

[0171] The alternating operation process of the forward and reverse motors is as follows: Figure 37 As shown.

[0172] Stalled rotor detection logic: During the last alternating operation in the alternating operation curve, the current of the forward or reverse motor during operation always exceeds the stalled rotor current, i.e., 0.3A.

[0173] Excessive judgment logic: The alternating running curve is repeated 5 times.

[0174] A schematic diagram of the alternating operation curve is shown below. Figure 38 As shown, when the forward motor is running, the reverse motor stops, and when the forward motor stops, the reverse motor runs. This process involves several alternating processes, with the interval between alternations gradually increasing, forming an alternating operation curve.

[0175] For example, the operating status of the forward motor is:

[0176] Run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds;

[0177] Run for 4 seconds, stop for 4 seconds; run for 4 seconds, stop for 4 seconds; run for 8 seconds, stop for 8 seconds; run for 8 seconds, stop for 8 seconds.

[0178] The corresponding operating status of the reversing motor is as follows:

[0179] Stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds;

[0180] Stop for 4 seconds, run for 4 seconds; stop for 4 seconds, run for 4 seconds; stop for 8 seconds, run for 8 seconds; stop for 8 seconds, run for 8 seconds.

[0181] In addition, the switching interval can be adjusted according to the measured locked-rotor current. The larger the measured locked-rotor current, the shorter the average alternation interval. For example, if the locked-rotor current is greater than 0.6A, the following adjustment should be made.

[0182] The forward motor is in operation as follows: Run for 0.5 seconds, stop for 0.5 seconds; run for 0.5 seconds, stop for 0.5 seconds; run for 0.5 seconds, stop for 0.5 seconds; Run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; Run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 4 seconds, stop for 4 seconds.

[0183] The corresponding operating status of the reversing motor is as follows: Stop for 0.5 seconds, run for 0.5 seconds; stop for 0.5 seconds, run for 0.5 seconds; stop for 0.5 seconds, run for 0.5 seconds; Stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; Stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 4 seconds, run for 4 seconds.

[0184] 12. Testing the DC slag discharge motor

[0185] There are two types of DC slag discharge motors: 24V DC slag discharge motors and 12V DC slag discharge motors. The testing process is the same; only the power supply voltage and operating current differ. The core of a DC slag discharge motor is a DC motor with two pins, connected to the positive and negative terminals of the DC power supply respectively. Switching the power supply direction changes the motor's rotation direction.

[0186] The burner interface pins corresponding to the DC slag discharge motor vary depending on the model. Taking the 5HGBS-60 model as an example, pins 8 and 12 are slag discharge motor + and slag discharge motor - respectively, with a power supply voltage of DC12V.

[0187] The main detection process is as follows: Figure 39 As shown, the content includes three aspects: detecting short-circuit faults, detecting reset faults, and detecting travel cycle faults.

[0188] Note: When the slag removal motor is not directly powered by DC12V or DC24V, it is normally in an open circuit state and the open circuit resistance cannot be detected. Therefore, only short circuit testing is performed here.

[0189] (1) Detect short-circuit faults. The procedure is as follows: Figure 40 As shown. Based on the technical characteristics of current mainstream DC slag discharge motors, the short-circuit resistance threshold is set to 5 ohms. The resistance R2 in the circuit is much larger than the motor resistance; therefore, the motor will not rotate after power is applied, and there is no back electromotive force. The motor resistance is calculated using the formula: resistance = voltage / current. If the motor resistance is less than the short-circuit resistance threshold, then it is a short-circuit fault.

[0190] Note: DC24V was used instead of DC12V during short-circuit fault detection to increase the voltage and current of the motor, thereby improving measurement accuracy.

[0191] (2) Fault detection and reset. Check whether the DC slag discharge motor can reset correctly within a specified time. The reset detection procedure is as follows: Figure 41 As shown.

[0192] When the DC slag discharge motor reaches the limit points at both ends, i.e. the reset point, the motor will automatically stop running under normal circumstances, and the current will drop to zero.

[0193] The DC slag discharge motor only generates current when it is running between two limit points. Here, the normal range of the operating current is taken as [0.5, 2.5], in amperes.

[0194] The time it takes for the DC slag discharge motor to travel from one limit point to the other, i.e. the stroke cycle, should not exceed the maximum stroke cycle, which is taken as 45 seconds here.

[0195] In the testing process, the logic for judging normal current is that the operating current is within the normal range, i.e., [0.5, 2.5].

[0196] The timeout judgment logic is that if the continuous running time in one direction exceeds the maximum travel time (45 seconds), the current has not yet reached 0.

[0197] Note: The DC slag discharge motor has an integrated limit switch that automatically cuts off the power when the motor reaches both ends, meaning the motor current returns to zero. Therefore, the motor will not stall under normal circumstances unless there is mechanical jamming during the stroke, causing it to stall.

[0198] (3) Detecting stroke cycle faults in the DC slag discharge motor. The procedure is as follows: Figure 42 As shown.

[0199] When the DC slag discharge motor reaches the limit points at both ends, i.e., the reset points, the current will automatically drop to zero. The normal operating current range is set here as [0.5, 2.5], in amps. The time it takes to travel from one end to the other, i.e., the stroke cycle, must not exceed the set time range, here taken as [5, 45], in seconds. If both forward and reverse rotations can reset normally within the stroke cycle, then the DC slag discharge motor's stroke cycle is considered normal.

[0200] Summarize:

[0201] (1) The present invention enables one detection device to detect multiple equipment in the curing room, is compatible with equipment from different manufacturers and models, does not require connection to the curing room controller or fuel, is plug-and-play, automatically detects and displays faults, does not require operators to have professional skills, has high detection efficiency, more comprehensive fault detection, and at the same time reduces labor costs.

[0202] (2) This invention enables automatic recording and uploading of testing process data to the Internet of Things platform, realizing automatic data storage and analysis. At the same time, the platform can automatically collect and display the fault data of the curing oven equipment, providing a reliable basis for formulating curing oven equipment replacement and procurement plans, screening high-quality suppliers, and revising technical standards. It also supervises the workload assessment of testing personnel, such as their location, work path, and number of curing ovens tested, thereby improving management efficiency.

Claims

1. A testing device for drying room equipment, characterized in that, The system includes a central control unit, which is connected to an AC voltage regulating and measuring circuit and / or a DC measuring circuit. The AC voltage regulating and measuring circuit is connected to the AC equipment of the drying oven. The central control unit controls the AC voltage regulating and measuring circuit to input the corresponding voltage to the AC equipment. The central control unit detects the voltage and current of the AC equipment and calculates its resistance to determine whether there is a fault. The DC measuring circuit is connected to the DC equipment of the drying oven. The central control unit controls the DC measuring circuit to input the corresponding voltage to the DC equipment. The central control unit detects the voltage and current of the DC equipment and calculates its resistance to determine whether there is a fault.

2. The testing device for drying room equipment according to claim 1, characterized in that: The DC measurement circuit includes a DC measurement module and a relay module. Both the DC measurement module and the relay module are connected to the central control equipment. One end of the relay module's switch SW1 is connected to a 24VDC power supply, and the other end of switch SW1 is connected to the input power supply terminal of the DC measurement module via resistor R2. Resistor R2 is connected in parallel with the relay module's switch SW4. One end of the relay module's switch SW2 is connected to a 12VDC power supply, and the other end of switch SW2 is connected to the common terminal of switch SW1 and resistor R2. The ground terminal of the DC measurement module is grounded. The output power supply terminal and ground terminal of the DC measurement module are connected to the DC equipment.

3. The testing device for drying room equipment according to claim 1, characterized in that: The AC voltage regulation and measurement circuit includes an AC voltage regulation module, an AC measurement module, and a relay module. All three modules are connected to a central control unit. The AC voltage regulation module's input live wire and input neutral wire are connected to the AC power supply. The AC voltage regulation module's output live wire is connected to the AC measurement module's input live wire via resistor R1. Resistor R1 is connected in parallel with the relay module's switch SW3. The AC voltage regulation module's output neutral wire is connected to the AC measurement module's input neutral wire. The AC measurement module's output live wire and output neutral wire are connected to the AC equipment.

4. The testing device for drying room equipment according to claim 1, characterized in that: The central control unit is connected to a temperature measurement module, which in turn connects to the dry and wet bulb temperature sensors of the drying oven equipment. The dry and wet bulb temperature sensors consist of four sensors: the upper dry bulb temperature sensor, the upper wet bulb temperature sensor, the lower dry bulb temperature sensor, and the lower wet bulb temperature sensor. The central control unit reads the values ​​from the four temperature sensors through the temperature detection module and determines whether there is a malfunction based on the reading results. The testing process includes three fault detection steps: (1) Read the temperature values ​​of the four temperature sensors. If a temperature sensor does not return a temperature value, it indicates that the temperature sensor is faulty. (2) For a temperature sensor that reads the temperature value correctly, determine whether the temperature value of the temperature sensor is within a reasonable range. Here, the reasonable range is set to [0, T1], unit: degrees. If a temperature value exceeds this range, it indicates that the temperature sensor is malfunctioning. (3) If all four temperature values ​​are read correctly and within a reasonable range, then determine whether the logical relationship between the temperature values ​​of the four temperature sensors is reasonable. If the logical relationship meets any of the following criteria, it indicates that there is a logical error in the logical relationship between the temperature values ​​of the temperature sensors. Logical condition 1: Upper rack dry-bulb temperature - Lower rack dry-bulb temperature [T2, T3]; Logical condition 2: Upper rack dry-bulb temperature - Lower rack dry-bulb temperature + Lower rack wet-bulb temperature - Upper rack wet-bulb temperature [T4, T5].

5. A control method including the detection device for the drying room equipment as described in claim 2, characterized in that: The DC equipment is equipped with a cold air damper, which is equipped with a cold air damper motor. The testing process includes the following steps: Step A1: The central control equipment detects short circuit and open circuit faults in the cold air damper. If the detection is normal, proceed to step A2; otherwise, determine that the cold air damper has a short circuit or open circuit fault and end. Step A2: The central control equipment detects a cold air damper angle reset fault. If the detection is normal, proceed to step A3; otherwise, determine that the cold air damper angle reset is faulty and end. Step A3: The central control equipment detects the cold air damper's travel cycle fault. If the detection is normal, the cold air damper is determined to be working normally, and the process ends; otherwise, the cold air damper's travel cycle is determined to be faulty, and the process ends. Step A1 includes connecting the output power terminal of the DC measurement module to intermediate node M1 via relay module switch SW10, and connecting intermediate node M1 to the positive terminal of the cold air damper motor via relay module switch SW24; connecting the ground terminal of the DC measurement module to intermediate node M2 ​​via relay module switch SW11, and connecting intermediate node M2 ​​to the negative terminal of the cold air damper motor via relay module switch SW27; Step A1 for detecting short circuit and open circuit faults includes the following steps: Step A11: The central control equipment first disconnects all switches of the relay module, and then closes switches SW1, SW10, SW11, SW24 and SW27 of the relay module. The 24VDC power supply is then supplied to the cold air door motor through resistor R2 and then through the DC measurement module. Step A12: The central control equipment reads the voltage and current through the DC measurement module, calculates the resistance of the cold air door motor, and then disconnects switches SW1, SW10, SW11, SW24 and SW27. Step A13: The central control equipment judges the detection results as follows: if the resistance of the cold air damper motor is greater than its open circuit resistance threshold, it is judged as an open circuit fault of the cold air damper motor; if the resistance of the cold air damper motor is less than its short circuit resistance threshold, it is judged as a short circuit fault of the cold air damper motor; otherwise, it is judged as normal for open circuit and short circuit detection; End. Step A2 includes connecting intermediate node M1 to the negative terminal of the cold air damper motor via switch SW26 of the relay module; connecting intermediate node M2 ​​to the positive terminal of the cold air damper motor via switch SW25 of the relay module; Step A2 for detecting angle reset faults includes the following steps: Step A21: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25 and SW26 of the relay module to power the cold air door motor with 12VDC power and reverse it. Wait 3 seconds. Step A22: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW24, and SW27 to power the cold air door motor with 12VDC and make it rotate in the forward direction. Step A23: The central control equipment reads its current through the DC measurement module, records it as the forward and stall current, and waits for 1 second; Step A24: The central control equipment reads its current through the DC measurement module, records it as the forward running current, and waits for 1 second; Step A25: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25, and SW26 to power the cold air door motor with 12VDC and reverse it. Step A26: The central control equipment reads the current through the DC measurement module, records it as the reverse stall current, and waits for 1 second; Step A27: The central control equipment reads the current of the cold air damper motor through the DC measurement module, records it as the reverse operation current, and waits for 5 seconds; Step A28: The central control unit disconnects all switches of the relay module to complete the reverse reset; Step A29: The central control device determines whether the angle reset is normal. If not, it is determined to be an angle reset fault, and the process ends. If so, the angle reset is considered normal, and the process ends. Step A29 includes the following: when the forward operating current, forward stall current, reverse operating current, and reverse stall current meet any of the following conditions, the cold air damper angle reset fault is considered to be present. Condition a. Forward running current / Reverse running current ∉ [0.95, 1.05]; Condition b. Forward stall current / Reverse stall current ∉ [0.95, 1.05]; Condition c. Forward running current / Forward stall current ∉ [0.35, 0.85]; Condition d. Reverse running current / reverse stall current ∉ [0.35, 0.85]; Step A3, detecting stroke cycle faults, includes: Step A31: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW24, and SW27 to power the cold air door motor with 12VDC and make it rotate in the forward direction. Start timing and wait for 1 second. Step A32: The central control equipment reads and records the current of the cold air damper motor through the DC measurement module; Step A33: The central control device determines whether the cold air damper motor is stalled. If so, record the forward rotation cycle; proceed to step A35; if not, proceed to step A33. Step A33: The central control device determines whether the cold air damper motor has timed out. If not, proceed to step A32; if yes, proceed to step A34. Step A34: The central control equipment determines that the forward rotation cycle has timed out; Step A35: The central control device first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW25, and SW26 to power the cold air door motor with 12VDC and reverse it. The timing restarts, and the device waits for 1 second. Step A36: The central control equipment reads and records the current of the cold air damper motor through the DC measurement module; Step A37: The central control device determines whether the cold air damper motor is stalled. If yes, record the reverse stroke cycle and proceed to step A39; if no, proceed to step A38. Step A38: The central control device determines whether the cold air damper motor has timed out in reverse. If not, proceed to step A36. If so, the central control device determines that the reverse stroke cycle of the cold air damper motor has timed out; Step A39: The central control unit disconnects all switches of the relay module and determines whether the stroke cycle of the cold air damper motor is normal; if not, the central control unit determines that the stroke cycle of the cold air damper motor is faulty; if yes, the central control unit determines that the stroke cycle of the cold air damper motor is normal and ends. If the test result meets any of the following conditions, it is determined to be a stroke cycle failure of the cold air door motor; a. Forward rotation cycle ∉ [3, 6] (unit: seconds); b. Reverse stroke period ∉ [3, 6] (unit: seconds); c. Forward stroke cycle / Reverse stroke cycle ∉ [0.9, 1.1].

6. A control method including the detection device for the drying room equipment as described in claim 2, characterized in that: The DC equipment is equipped with a DC slag discharge motor. Pins 8 and 12 of the burner interface CN7 are connected to the positive and negative terminals of the slag discharge motor, respectively. The output power of the DC measurement module is connected to intermediate node M1 via relay module switch SW10. Intermediate node M1 is connected to pin 8 of burner interface CN7 via relay module switch SW14. Intermediate node M1 is also connected to pin 12 of burner interface CN7 via relay module switch SW22. The ground terminal of the DC measurement module is connected to intermediate node M2 ​​via relay module switch SW11. Intermediate node M2 ​​is connected to pin 8 of burner interface CN7 via relay module switch SW15. Intermediate node M2 ​​is also connected to pin 12 of burner interface CN7 via relay module switch SW23. The main process for detecting faults in DC slag discharge motors includes the following steps: Step E1: The central control equipment checks whether the DC slag discharge motor has a short circuit fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a short circuit fault, and the process ends; otherwise, proceed to step E2. Step E2: The central control equipment checks whether the DC slag discharge motor has a reset fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a reset fault, and the process ends. Otherwise, proceed to step E3; Step E3: The central control equipment checks whether the DC slag discharge motor has a stroke cycle fault. If the detection is abnormal, it is determined that the DC slag discharge motor has a stroke cycle fault, and the process ends; otherwise, it is determined that the DC slag discharge motor is working normally, and the process ends. Step E1, the central control equipment detects a short circuit fault in the DC slag discharge motor, including the following steps: Step E11: The central control equipment first disconnects all switches of the relay module, then closes switches SW1, SW10, SW11, SW14, and SW23. The DC 24V power supply is then supplied to the DC slag discharge motor through resistor R2 and the DC measurement module. Step E12: The central control equipment reads the voltage and current of the DC slag discharge motor through the DC measurement module chip, calculates the resistance of the DC slag discharge motor, and then disconnects all switches of the relay module. Step E13: The central control equipment determines whether the resistance of the DC slag discharge motor is normal. If it is less than the short-circuit resistance threshold, it determines that the DC slag discharge motor has a short-circuit fault and ends; otherwise, it determines that the short-circuit detection of the DC slag discharge motor is normal and ends. Step E2, the central control equipment's detection of a DC slag discharge motor reset fault, includes the following steps: Step E21: The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW15, and SW22 to power the DC slag discharge motor with DC12V and start timing. Step E22: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E23: The central control equipment determines whether the current of the DC slag discharge motor is zero. If it is, it determines that the DC slag discharge motor reset is normal and proceeds to step E27; otherwise, it proceeds to step E24. Step E24: The central control equipment determines whether the current of the DC slag discharge motor is normal. If it is, proceed to step 25; if not, proceed to step E26. Step 25: The central control equipment determines whether the DC slag discharge motor has timed out. If not, proceed to step E22; if yes, proceed to step E26. Step 26: The central control equipment determines that the DC slag discharge motor has a reset fault; Step E27: The central control unit disconnects all switches of the relay module, ending the process; Step E3, the central control equipment's detection of DC slag discharge motor stroke cycle faults, includes the following steps: Step E31: The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW14, and SW23 to power the DC slag discharge motor with DC12V and make it rotate in the forward direction, and starts timing; Step E32: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E33: The central control equipment determines whether the current of the DC slag discharge motor is zero. If so, proceed to step E36. If not, proceed to step E34; Step E34: The central control equipment determines whether the current of the DC slag discharge motor is normal. If not, proceed to step E41. If so, proceed to step E35; Step E35: The central control equipment determines whether the forward rotation of the DC slag discharge motor has timed out. If not, proceed to step E32; if yes, proceed to step E41. Step E36: ​​The central control equipment first disconnects all switches of the relay module, then closes switches SW2, SW4, SW10, SW11, SW15, and SW22 to power the DC slag discharge motor with DC12V and reverse it, and starts timing. Step E37: The central control equipment reads the current of the DC slag discharge motor through the DC measurement module; Step E38: The central control equipment determines whether the current of the DC slag discharge motor is zero; if yes, it determines that the DC slag discharge motor reset is normal and proceeds to step E42; if no, it proceeds to step E39. Step E39: The central control equipment determines whether the current of the DC slag discharge motor is normal. If not, proceed to step E41. If so, proceed to step E40; Step E40: The central control equipment determines whether the DC slag discharge motor reverse rotation has timed out. If not, proceed to step E37; if yes, proceed to step E41. Step E41: The central control equipment determines that the DC slag discharge motor has a reset fault; Step E42: The central control unit disconnects all switches of the relay module, ending the process; If the DC slag discharge motor can reset normally within the stroke cycle in both forward and reverse rotation, then the stroke cycle of the DC slag discharge motor is considered to be normal. The timeout judgment logic is that the DC slag discharge motor runs continuously in one direction for more than 45 seconds beyond the maximum stroke time, and the current has not yet reached 0; the normal operating current range of the DC slag discharge motor is [0.5, 2.5], unit: Amperes; The time it takes to travel from one end to the other, i.e. the travel period, shall not exceed the set time range. The travel period is [5, 45], and the unit is seconds.

7. A control method including the detection device for the drying room equipment as described in claim 3, characterized in that: The AC equipment is equipped with a feeding motor and a discharge motor. Pins 1 and 2 of the burner interface CN7 are connected to the live wire and neutral wire of the feeding motor, respectively. The live wire output of the AC measurement module is connected to one end of the switch SW5 of the relay module. The other end of the switch SW5 is connected to pin 1 of the burner interface CN7 via node P1. The neutral wire output of the AC measurement module is connected to node P246. Pin 2 of the burner interface CN7 is connected to node P246. Pins 7 and 2 of the burner interface CN7 are connected to the live wire and neutral wire of the discharge motor, respectively. The live wire output of the AC measurement module is connected to one end of the switch SW8 of the relay module. The other end of SW8 is connected to intermediate node M1. Intermediate node M1 is connected to pin 7 of the burner interface CN7 via the switch SW12 of the relay module. The main testing process for the feeding motor and the unloading motor is the same, including the following steps: Step B1: Detect short circuit and open circuit faults; Determine if short circuit and open circuit are normal. If not, determine if there is a short circuit or open circuit fault and end. If so, proceed to step B2; Step B2: Detect stall faults; Determine if the stall detection is normal; if not, determine if there is a stall fault. If so, the stall detection is considered normal; The procedure for detecting short circuit and open circuit faults in the feed motor includes the following steps: Step BA1: The central control equipment first disconnects all switches of the relay module, then closes switch SW5. The AC voltage regulating module supplies power to the feed motor through resistor R1 and then through the AC measurement module. The AC voltage regulator module outputs 10% of its rated voltage. Step BA2: The central control equipment reads the voltage and current of the feed motor through the AC measurement module, calculates the resistance of the feed motor, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module to shut off its output. Step BA3: The central control equipment checks whether the resistance value of the feeding motor is normal. If it is greater than the open circuit resistance threshold of the feeding motor, the feeding motor is determined to be open circuit fault, and the process ends. If the resistance is less than the short-circuit resistance threshold of the feed motor, the feed motor is determined to be short-circuit faulted, and the process ends; otherwise, the feed motor is determined to be normal in both open-circuit and short-circuit detection. The procedure for detecting short circuit and open circuit faults in the unloading motor includes the following steps: Step BB1: The central control equipment first disconnects all switches of the relay module, then closes switches SW8 and SW12. The AC voltage regulator module supplies power to the unloading motor through resistor R1 and then through the AC measurement module; the AC voltage regulator module outputs 10% of the rated voltage. Step BB2: The central control equipment reads the voltage and current of the unloading motor through the AC measurement module, calculates the resistance of the unloading motor, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module to shut off its output. Step BB3: The central control equipment checks whether the resistance value of the unloading motor is normal. If it is greater than the open circuit resistance threshold of the unloading motor, the unloading motor is determined to be open circuit fault, and the process ends. If the resistance is less than the short-circuit resistance threshold of the unloading motor, the unloading motor is determined to be short-circuit faulted, and the process ends; otherwise, the unloading motor is determined to be normal in both open-circuit and short-circuit detection. Step B2, detecting stall faults, includes the following steps: Step B21: The central control equipment first disconnects all switches of the relay module, then closes switches SW3 and SW5, and the AC voltage regulator module outputs 100% of the rated voltage, so that the working voltage of the feeding motor is AC220V, and the timing starts. Step B22: The central control equipment reads the current of the feed motor through the AC measurement module and records its current value; Step B23: The central control equipment determines whether the feed motor has timed out. If not, proceed to step B22. If so, proceed to step B24; Step B24: The central control equipment determines whether the feed motor is stalled. If so, it runs the alternating operation process of the feed motor and the unloading motor, and then ends. If not, proceed to step B25; Step B25: The central control equipment first disconnects all switches of the relay module, then closes switches SW3, SW8, and SW12. The AC voltage regulator module outputs 100% of the rated voltage, making the working voltage of the unloading motor AC220V, and the timing begins. Step B26: The central control equipment reads its current through the AC measurement module and records the current value; Step B27: The central control equipment determines whether the unloading motor has timed out. If not, proceed to step B26; if yes, proceed to step B28. Step B28: The central control equipment determines whether the unloading motor is stalled. If so, it runs the alternating operation process of the feeding motor and the unloading motor, and then ends. If not, proceed to step B29; Step B29: The central control equipment determines that there is no material blockage fault in the feeding motor and the unloading motor, and ends; The timeout period is set to 10 seconds, and the stall current is set to 0.9A. The stall judgment logic is: within 1 second before the timeout, that is, between the 9th and 10th seconds after the start of the timing, the current always exceeds 0.9A.

8. The control method for the detection device of the drying room equipment according to claim 7, characterized in that: The alternating operation process of the feeding motor and the unloading motor includes the following steps: Step BC1: The central control equipment starts timing, causing the feeding motor and the unloading motor to run according to the alternating operating status data, cyclically reading and recording the current, and disconnecting all switches of the relay module when it ends; Step BC2: The central control equipment determines whether the feeding motor and the unloading motor are stalled. If not, it determines that there is no stall fault in the feeding motor and the process ends. If so, proceed to step BC3; Step BC3: The central control equipment determines whether the alternating operation of the feeding motor and the unloading motor has exceeded the limit. If not, proceed to step BC1. If so, proceed to step BC4; Step BC4: The central control equipment determines that the feed motor and the unloading motor still have a stall fault, and ends; Stall detection logic: During the last alternating operation in the alternating operation data, the current of the feeding motor or the unloading motor when it is powered on always exceeds the stall current, i.e., 0.9A; Excessive iteration check logic: Repeat 5 times according to the alternating data; When the feeding motor is running, the unloading motor stops. When the feeding motor stops, the unloading motor runs, which includes a set number of alternating processes. The alternation interval time gradually increases, forming an alternating operation state. The operating status of the feed motor is as follows: run for 1 second, stop for 1 second; run for 1 second, stop for 1 second; run for 2 seconds, stop for 2 seconds; run for 2 seconds, stop for 2 seconds; run for 4 seconds, stop for 4 seconds; run for 4 seconds, stop for 4 seconds; run for 8 seconds, stop for 8 seconds; run for 8 seconds, stop for 8 seconds. The corresponding operating states of the unloading motor are: stop for 1 second, run for 1 second; stop for 1 second, run for 1 second; stop for 2 seconds, run for 2 seconds; stop for 2 seconds, run for 2 seconds; stop for 4 seconds, run for 4 seconds; stop for 4 seconds, run for 4 seconds; stop for 8 seconds, run for 8 seconds; stop for 8 seconds, run for 8 seconds.

9. A control method including the detection device for the drying room equipment as described in claim 3, characterized in that: The AC equipment is equipped with an ignition rod. Pins 3 and 4 of the burner interface CN7 are connected to the live wire and neutral wire of the ignition rod, respectively. The live wire of the AC measurement module is connected to one end of the switch SW6 of the relay module. The other end of the switch SW6 is connected to node P3. Node P3 is connected to pin 3 of the burner interface. The neutral wire of the AC measurement module is connected to node P246. Node P246 is connected to pin 4 of the burner interface. The main process for detecting heating rod malfunctions includes the following steps: Step C1: The central control unit detects the cold resistance of the ignition rod. If the cold resistance is abnormal, the ignition rod resistance detection is determined to be faulty, and the process ends; if the cold resistance detection is normal, proceed to step C2. Step C2: The central control unit detects the hot resistance of the ignition rod. If the hot resistance detection is abnormal, the ignition rod resistance detection is determined to be faulty, and the process ends; if the hot resistance detection is normal, the ignition rod resistance detection is determined to be normal. Step C1, which involves the central control equipment detecting the cold resistance of the ignition rod, includes the following steps: Step C11: The central control unit first disconnects all switches of the relay module, then closes switch SW6. The AC voltage regulator module supplies power to the ignition rod through resistor R1 and then through the AC measurement module. The AC voltage regulator module outputs 10% of the rated voltage. Step C12: The central control unit reads the voltage and current of the ignition rod through the AC measurement module, calculates the cold resistance of the ignition rod, and then disconnects all switches of the relay module. The central control unit controls the AC voltage regulation module to shut off its output. Step C13: The central control unit determines whether the cold resistance of the ignition rod is normal. If the cold resistance of the ignition rod is greater than its open circuit resistance threshold, it is determined that the ignition rod is open circuit faulted and the process ends. If the cold resistance of the ignition rod is less than its short circuit resistance threshold, it is determined that the ignition rod is short circuit faulted and the process ends. Otherwise, it is determined that the cold resistance of the ignition rod is normal and the process ends. Step C2, which involves the central control equipment detecting the hot resistance of the ignition rod, includes the following steps: Step C21: The central control unit first disconnects all switches of the relay module, then closes switches SW3 and SW6 to power the ignition rod with the output voltage of the AC voltage regulating module and starts the timing. Step C22: The central control equipment reads the voltage and current of the ignition rod through the AC measurement module, and adjusts the output voltage of the AC voltage regulator module to make its current reach the constant current target; Step C23: The central control unit determines whether the ignition rod power-on timeout has occurred. If yes, proceed to step C26; if no, the central control unit calculates the ignition rod power and proceeds to step C24. Step C24: The central control unit determines whether the ignition rod exceeds the set power limit; if not, proceed to step C22; if yes, proceed to step C25. Step C25: The central control unit reads the voltage and current of the ignition rod through the AC measurement module, adjusts the output voltage of the AC voltage regulator module to make the power of the ignition rod reach the limit power; proceed to step C22; Step C26: The central control unit calculates the hot resistance of the ignition rod; Step C27: The central control unit determines whether the hot resistance of the ignition rod is normal. If the hot resistance of the ignition rod is greater than the upper limit of the hot resistance, it is determined that the ignition rod power is too low and the process ends. If the hot resistance of the ignition rod is less than the lower limit of the hot resistance, it is determined that the ignition rod power is too high and the process ends. Otherwise, the ignition rod power is determined to be normal and the process ends.

10. The control method of the drying room equipment detection device according to claim 9, characterized in that: The short-circuit resistance threshold of the ignition rod in the cold state is set to 30 ohms, and the open-circuit resistance threshold in the cold state is set to 150 ohms; the allowable range of the hot resistance of the ignition rod is set to [80, 132], in ohms; the constant current target is 3A, the power limit is 400W, and the timeout time is 120 seconds.

11. A control method including the detection device for the drying room equipment as described in claim 3, characterized in that: The AC equipment is equipped with a blower. Pins 5 and 6 of the burner interface CN7 are connected to the live wire and neutral wire of the blower, respectively. The live wire of the AC measurement module is connected to one end of the switch SW7 of the relay module. The other end of the switch SW7 of the relay module is connected to node P5. Node P5 is connected to pin 5 of the burner interface CN7. The neutral wire of the AC measurement module is connected to node P246. Node P246 is connected to pin 6 of the burner interface CN7. The main process for detecting blower malfunctions includes the following steps: Step D1: The central control equipment detects short circuit and open circuit faults in the blower. If the detection is abnormal, it is determined that the blower has a short circuit or open circuit fault, and the process ends. If the test is normal, proceed to step D2; Step D2: The central control equipment detects blower operating current faults. If the detection is abnormal, the blower operating current is determined to be faulty, and the process ends. If the test is normal, the blower is considered to be working properly, and the process ends. Step D1, the process for detecting short circuit and open circuit faults in the central control equipment for the blower, includes the following steps: Step D11: The central control unit first disconnects all switches of the relay module, then closes switch SW7. The AC voltage regulator module supplies power to the blower through resistor R1 and then through the AC measurement module; the AC voltage regulator module outputs 10% of the rated voltage. Step D12: The central control equipment reads the voltage and current of the blower through the AC measurement module, calculates the blower resistance, and then disconnects all switches of the relay module. The central control equipment controls the AC voltage regulation module output to shut off. Step D13: The central control equipment determines whether the resistance of the blower is normal. If the resistance of the blower is greater than its open circuit voltage threshold, it is determined that the blower has an open circuit fault, and the process ends. If the resistance of the blower is less than its short-circuit voltage threshold, then the blower is determined to have a short-circuit fault, and the process ends. Otherwise, the open circuit and short circuit tests of the blower are deemed normal, and the process ends. Step D2, the central control equipment detects blower operating current faults, including: The central control equipment first disconnects all switches of the relay module, and then closes switches SW3 and SW7 of the relay module to enable the AC voltage regulating module to supply power to the blower. The central control equipment adjusts the working voltage of the blower through the AC voltage regulation module. The voltage rises from the starting voltage to the maximum voltage in N stages, where N is greater than or equal to 2. The voltage increases gradually according to the set step size, and the running time of each step is fixed. When the maximum voltage is reached and the running time ends, the blower voltage is restored to zero. Each stage has a current acquisition time period. During the current acquisition time period, the central control equipment reads the blower's operating current through the AC measurement module, takes the current within M seconds before the voltage step as the steady-state current, and determines whether it is within the steady-state current range. If it is not within the steady-state current range, it is determined that there is an operating current fault. If it is within the steady-state range, further determine whether the current fluctuation amplitude during the current acquisition period exceeds the set amplitude threshold. If it exceeds the amplitude threshold, determine that its operating current is faulty. If it does not exceed the amplitude threshold, further determine whether the steady-state operating current of the blower increases step by step with the working voltage. If not, determine that its operating current is faulty; if so, determine that its operating current is normal.

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