High-efficiency anti-overload dampening device for loose dampening machine and control method thereof

Abstract

The present application belongs to the technical field of tobacco processing equipment, and particularly relates to a high-efficiency anti-overload moisture removal device for a loose re-humidifying machine and a control method thereof. The device comprises a chain mesh belt conveyor, a friction type torque limiting coupling, a speed reducer, a monitoring assembly, a flow guide cover, a dewatering waste tank and a PLC control system. The device directly guides the tobacco shreds into the waste tank through a scraper, avoids secondary pollution, combines the torque limiting coupling with the PLC graded protection, ensures flexible shutdown in case of failure, and comprehensively judges based on the current and signals; optimizes the equipment maintenance cycle; reduces the unplanned downtime, and guarantees the batch production continuity.

Description

Technical Field

[0001] This invention belongs to the technical field of tobacco processing equipment, specifically relating to a high-efficiency anti-overload dehumidification device and its control method for a loosening and rehumidifying machine, which is suitable for optimizing the dehumidification system of the loosening and rehumidifying process in a tobacco shredding production line. Background Technology

[0002] In the tobacco processing production line, the rehumidifier is one of the key pieces of equipment. Its main function is to heat and humidify the material and loosen it to meet the requirements of subsequent processing. Existing rehumidifiers typically use a rotating filter cylinder (moisture-removing roller) combined with a brush roller structure, which has the following drawbacks:

[0003] 1. Secondary pollution from fly dust: When the brush roller cleans the dehumidification screen, wet fly dust clumps may fall into the material, affecting moisture control.

[0004] 2. Risk of pipe blockage: Fine dust particles enter the exhaust and hot air ducts and adhere to the fan impeller, increasing the frequency of cleaning.

[0005] 3. Overload shutdown hazard: Insufficient bearing lubrication or inadequate maintenance can cause the dehumidification roller motor to trip, leading to material shortage and shutdown of the production line.

[0006] Therefore, there is an urgent need to design a dehumidification device with optimized structure and overload protection to improve production stability and product quality. Summary of the Invention

[0007] The purpose of this invention is to provide a high-efficiency anti-overload dehumidification device and its control method for loosening and rehumidifying machines, so as to solve the problems of dust contamination of materials, entry into pipelines, and overload shutdown in existing equipment.

[0008] To achieve the above objectives, this application employs the following technical solution:

[0009] A high-efficiency anti-overload dehumidification device for a loose rehumidifier includes a chain mesh belt conveyor, a friction torque limiting coupling, a reducer, a monitoring component, a flow guide, a drain waste trough, and a PLC control system.

[0010] The chain mesh belt conveyor is installed inside the rear chamber of the loosening and rehumidifying machine. The friction torque limiting coupling is set between the drive sprocket shaft of the chain mesh belt conveyor and the output shaft of the reducer. The monitoring component is set on one side of the chain mesh belt conveyor. The guide shroud is funnel-shaped and connects the chain mesh belt conveyor and the drain waste trough.

[0011] The PLC controller is electrically connected to the chain conveyor, the reducer, and the monitoring components.

[0012] Furthermore, the chain mesh belt conveyor includes a mesh belt, a chain, a drive sprocket, a drive sprocket shaft, a driven sprocket, a driven sprocket shaft, a small shaft, and a scraper;

[0013] The mesh belt is formed by alternating arrangement and welding of toothed strips, left mesh strips and right mesh strips to form a diamond-shaped mesh.

[0014] The small shaft is inserted into the mesh belt, and annular grooves are provided at both ends of the small shaft;

[0015] The chain is a double-pitch roller chain, and its link holes cooperate with the annular grooves at both ends of the small shaft and are limited by cotter pins;

[0016] The driving sprocket is connected to the driving sprocket shaft via a keyway, and the driven sprocket is connected to the driven sprocket shaft via a keyway.

[0017] The active sprocket shaft is connected to a friction torque limiting coupling via a keyway, and the passive sprocket shaft is tensioned via a slider seat bearing.

[0018] The scraper is fixed to the bottom support at the discharge end, and is inclined at a 45° angle to the mesh belt contact surface, with the end connected to a guide shroud.

[0019] Furthermore, the friction torque limiting coupling includes an output sprocket, a double-row chain, an input sprocket, friction plates, a disc spring, and a bushing;

[0020] The output sprocket is connected to the drive sprocket shaft via a keyway, and the bushing is connected to the reducer output shaft via a keyway; the disc spring is located on one side of the friction plate, and the double-row chain is located on the output sprocket.

[0021] Furthermore, the friction torque limiting coupling also includes a pressure plate, bushing, adjusting bolts, and guide pressure plate.

[0022] Furthermore, the monitoring component includes a rubber block, a sensing iron, a proximity switch, and a proximity switch bracket; the rubber block is coaxially mounted on the driven sprocket shaft, and the sensing iron is fixed to the rubber block; the proximity switch is fixed to the slider seat bearing via an L-shaped bracket.

[0023] Furthermore, the drain waste tank is equipped with a detachable filter screen with an inclination angle of 15-25 degrees, and a drain outlet is provided at the bottom of the drain waste tank.

[0024] A control method based on any one of the above-described devices includes the following steps:

[0025] S1, the PLC control system collects the periodic high-level signals of the proximity switch and the current data of the reducer motor in real time;

[0026] S2 and PLC control system judge that if the proximity switch signal is periodically triggered and the current is less than the normal current threshold, it is in normal operation state;

[0027] If the proximity switch signal is lost for less than 5 seconds, or if the normal current threshold is ≤ current < current warning threshold, a Level 1 warning state is activated. Abnormal data is recorded, and a reminder is issued that maintenance will be performed after all batches for the day are completed.

[0028] If the proximity switch signal is lost for ≥5 seconds or the current is ≥ the current warning threshold, it is in the secondary protection state, and the machine will be shut down for maintenance after the current batch ends.

[0029] Furthermore, in step S2, if the current does not return to the normal threshold within the set time after the first-level warning is triggered, the protection will be upgraded to the second-level protection state.

[0030] If the first-level warning is triggered ≥ the set number of times in a single day, the PLC control system will generate a maintenance work order prompting lubrication or tension adjustment.

[0031] Furthermore, the proximity switch signal period is calculated by the PLC control system timer, and the signal loss determination logic is based on the continuous pulse interval timeout trigger.

[0032] Furthermore, it also includes an overload protection mechanism. When the torque limiting coupling disengages, the PLC control system records the current and duration at the moment of disengagement, and requires manual reset of the coupling and clearing of fault codes.

[0033] The beneficial effects of this invention are:

[0034] This device uses a scraper to directly guide the pulverized smoke into the waste trough, avoiding secondary pollution. It combines a torque limiting coupling with PLC-based graded protection to ensure flexible shutdown in case of failure, based on a comprehensive judgment of current and signals. This optimizes equipment maintenance cycles, reduces unplanned downtime, and ensures the continuity of batch production. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the high-efficiency anti-overload dehumidification device for the loose rehumidifier of the present invention.

[0036] Figure 2 This is a schematic diagram of the structure of the high-efficiency anti-overload dehumidification device for the loose rehumidifier of the present invention.

[0037] Figure 3 This is a schematic diagram of the chain mesh belt conveyor structure of the present invention.

[0038] Figure 4 This is a schematic diagram of the friction-type torque limiting coupling of the present invention.

[0039] Figure 5 This is a cross-sectional view of the friction-type torque limiting coupling of the present invention.

[0040] Figure 6 This is a schematic diagram of the monitoring component structure of the present invention.

[0041] Figure 7 This is a schematic diagram of the proximity switch bracket structure of the monitoring component of the present invention.

[0042] Figure 8 This is a schematic diagram of the equipment operation process of the present invention.

[0043] Figure 9 This is a schematic diagram of the control logic flow of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Chain mesh belt conveyor; 2. Friction torque limiting coupling; 3. Reducer; 4. Monitoring components; 5. Flow guide; 6. Stainless steel pipe; 7. Waste drain trough; 8. PLC control system; 11. Mesh belt; 12. Chain; 13. Drive sprocket; 14. Drive sprocket shaft; 15. Driven sprocket; 16. Driven sprocket shaft; 17. Small shaft; 18. Scraper; 201. Output sprocket; 202. Double row chain; 203. Input sprocket; 204. Friction plate; 205. Pressure plate; 206. Liner ring; 207. Bushing; 208. Adjusting bolt; 209. Nut; 210. Butterfly spring; 211. Guide pressure plate; 41. Rubber block; 42. Induction iron; 43. Proximity switch; 44. Proximity switch bracket. Detailed Implementation

[0046] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and should not be construed as limiting the technical solution of the present invention.

[0047] like Figures 1 to 7 As shown, a high-efficiency anti-overload dehumidification device for a loose rehumidifier is provided, including a chain mesh belt conveyor 1, a friction torque limiting coupling 2, a reducer 3, a monitoring component 4, a flow guide 5, a stainless steel pipe 6, a drain waste trough 7, and a PLC control system 8.

[0048] The chain mesh belt conveyor 1 consists of a mesh belt 11, a chain 12, a drive sprocket 13, a drive sprocket shaft 14, a driven sprocket 15, a driven sprocket shaft 16, a small shaft 17, and a scraper 18. It is installed inside the rear chamber of the loosening and rehumidifying machine, and its total length is greater than the width of the rear chamber of the loosening and rehumidifying machine.

[0049] In this application, the mesh belt 11 is made of 304 stainless steel and is composed of alternating toothed bars, left mesh bars (right-hand thread structure), and right mesh bars (left-hand thread structure); the toothed bars and the left and right mesh bars are connected by high-frequency welding to form a diamond-shaped mesh with a hole diameter ≤2mm and a spacing of 5mm between adjacent mesh holes.

[0050] Several small shafts 17 are inserted inside the mesh belt 11. Annular grooves with a depth of 0.5mm are machined at both ends of the small shafts.

[0051] Chain 12 adopts a double-pitch roller chain with a pitch P=25.4mm. The chain hole is matched with the slots at both ends of the mesh belt shaft 17. Through the cotter pin with a diameter of Φ3mm, the chain can synchronously drive the mesh belt.

[0052] The driving sprocket 13 is connected to the driving sprocket shaft 14 via a keyway; the driven sprocket 15 is also connected to the driven sprocket shaft 16 via a keyway; the driving sprocket shaft 14 is connected to the friction torque limiting coupling 2 via a keyway, and the other end of the friction torque limiting coupling 2 is fixed to the output shaft of the reducer 3 via a keyway.

[0053] The two ends of the drive sprocket shaft 14 are fixed to one end of the rear chamber of the loosening and rehumidifying machine via the slider seat bearing UCT206, and the driven sprocket shaft 16 is installed at the other end of the rear chamber of the loosening and rehumidifying machine via the slider seat bearing UCT206, for adjusting the chain tension.

[0054] The scraper 18 is a polyurethane scraper with a Shore hardness of 85A and a thickness of 10mm. It is fixed to the angle steel bracket at the bottom of the discharge end by bolts. The scraper 18 has a 45° inclined angle with the mesh belt. The end of the scraper is connected to a stainless steel guide shroud 5 with a wall thickness of 1.5mm. The outlet of the guide shroud 5 is connected to a Φ150mm stainless steel pipe 6 through a flange to guide the smoke into the dewatering waste tank 7.

[0055] The friction torque limiting coupling 2 is installed between the drive sprocket shaft and the output shaft of the reducer 3, and consists of an output sprocket 201, a double-row chain 202, an input sprocket 203, a friction plate 204, a pressure plate 205, a bushing 206, a bushing 207, an adjusting bolt 208, a nut 209, a disc spring 210, and a guide pressure plate 211.

[0056] In this application, the output sprocket 201 is connected to the drive sprocket shaft of the chain mesh belt conveyor 1 via a keyway, and the bushing 207 is connected to the output shaft of the reducer 3 via a keyway. During normal operation, the output shaft of the reducer 3 drives the bushing 207 to rotate. The bushing 207 transmits power to the friction plate 204 through the preload of the disc spring 210. The friction plate 204 is in close contact with the input sprocket 203. The input sprocket 203 transmits power to the output sprocket 201 through the double-row chain 202. The output sprocket 201 drives the drive sprocket shaft to rotate, thus driving the chain mesh belt conveyor 1 to run. When an overload occurs, relative sliding occurs between the friction plate 204 and the input sprocket 203 / shaft sleeve 207; the power transmission between the input sprocket 203 and the output sprocket 201 is cut off, and the drive sprocket shaft 14 of the chain mesh belt conveyor 1 stops rotating, protecting the motor and transmission system; after the overload is eliminated, the disc spring 210 automatically resets, the friction plate 204 re-fits, and the power transmission is restored.

[0057] The monitoring component 4 includes a rubber block 41, an inductive iron 42, a proximity switch 43, and a proximity switch bracket 44.

[0058] In this application, the rubber block 41 is coaxially installed with the passive sprocket shaft 16 of the chain mesh belt conveyor 1 via threads; the induction iron 42 is fixed to the rubber block 41 via threads; and the proximity switch 43 is installed on the proximity switch bracket 44 for monitoring the operating status of the chain mesh belt conveyor 1.

[0059] The proximity switch 43 is an NPN inductive sensor with a detection distance of 5-8mm, and its output signal is transmitted to the PLC control system 8.

[0060] The proximity switch bracket 44 is an irregular "L-shaped" bracket with a hole and a clamp at one end. The hole diameter is the same as the screw hole in the slider seat bearing, and the clamp distance is the same as the width of the slider seat bearing, so that the proximity switch bracket 44 can be fixed by means of the tension screw, nut 209 and slider seat bearing; the other end of the proximity switch bracket 44 has a hole for mounting the proximity switch 43.

[0061] The guide shroud 5, funnel-shaped and made of stainless steel, is placed below the scraper of the chain mesh belt conveyor 1 to guide the waste material scraped off the mesh belt.

[0062] The upper end of the stainless steel pipe 6 is connected to the flow guide shroud 5 via a flange, and the lower end is placed in the drain waste tank 7.

[0063] The waste drain trough 7 is a welded box made of 304 stainless steel, with a removable filter screen with an inclination angle of 15°-25° and a pore size of ≤1mm inside.

[0064] A drain outlet with a diameter of Φ50mm is installed below the filter screen and connected to the workshop wastewater pipe.

[0065] The PLC control system 8 includes a Siemens S7-1500 controller, a current transmitter, an audible and visual alarm, and a PLC control cabinet.

[0066] The current transmitter 82 is connected in series in the power supply circuit of the reducer 3 motor to collect motor current data in real time; the current signal is collected in real time and transmitted to the PLC via the Modbus RTU protocol. The PLC has built-in response logic to determine the operating status of the chain mesh belt conveyor 1 by the motor current value of the reducer 3 and the signal cycle of the proximity switch 43.

[0067] The audible and visual alarm 83 consists of a green light, a yellow light, a red light, and a buzzer, and is installed on the top of the PLC control cabinet.

[0068] The PLC control cabinet has an IP54 protection rating and a built-in RS485 communication module, which synchronizes the operating status with the central control system in real time.

[0069] Device installation:

[0070] 1) The chain mesh belt conveyor is installed in the rear chamber of the loosening and rehydration machine, and the length of the mesh belt is greater than the width of the rear chamber.

[0071] 2) The friction torque limiting coupling is connected to the drive sprocket shaft and the reducer output shaft through the keyway; the diameter of one end of the irregular "L-shaped" bracket matches the screw hole in the bearing of the slider seat, Φ10mm, and the distance between the jaws is consistent with the width of the bearing (50mm).

[0072] 3) The rubber block is installed coaxially with the driven sprocket shaft via threads, and the sensing iron is fixed to the surface of the rubber block with M6 screws to ensure that the detection distance between the sensing iron and the proximity switch is 5-8mm.

[0073] 4) The flow guide is connected to the Φ150mm stainless steel pipe through a flange, and the waste drain is installed next to the workshop drainage pipe.

[0074] PLC control system debugging:

[0075] 1) The current transmitter (0-20mA output) is connected in series in the power supply circuit of the reducer motor and connected to the PLC analog input module (AI0.1) through a shielded cable (cross-sectional area 0.5mm²); the current transmitter range is set to 120% of the rated current of the motor and the calibration error is ≤1%.

[0076] 2) The proximity switch output signal (NPN type, 0V / 24V) is connected to the PLC digital input module (DI0.0) and communicates with the PLC controller (Siemens S7-1500) via the Modbus RTU protocol;

[0077] 3) The proximity switch bracket is fixed by a slider seat bearing (UCT206) to ensure a stable detection distance between the sensor and the sensing iron.

[0078] 4) The audible and visual alarm (green light, yellow light, red light and buzzer) is connected to the PLC output module (DO0.0 - DO0.3) through the relay module (SM1223).

[0079] 5) The protection grade of the alarm is IP54. It is installed on the top of the PLC control cabinet, and the alarm signal uses the combination of LED indicator lights and buzzer to prompt the equipment status.

[0080] Such as Figure 8 and Figure 9 shown, this application also provides a control method for an efficient overload - proof moisture - exhaust device for a loose - leaf re - moistening machine, including the following steps:

[0081] 1. Current data acquisition and threshold setting:

[0082] 1) The PLC control system continuously acquires the current data of the reducer motor with a sampling frequency of 100 Hz, and stores the data in the memory area through the Modbus RTU protocol.

[0083] 2) The normal current threshold I1 is set to 80% - 100% of the rated current of the motor. For example, when the rated current is 5 A, I1 = 4 A - 5 A.

[0084] 3) The current warning threshold I2 is set to 120% - 130% of the rated current, and I1 < I2. For example, I2 = 6 A - 6.5 A.

[0085] 2. Proximity switch signal monitoring:

[0086] 1) The proximity switch periodically outputs a high - level signal, and the pulse frequency is proportional to the chain speed. The PLC calculates the signal period through the timer (T0 - T3) to judge the running state of the chain.

[0087] 3) If the loss of the proximity switch signal lasts for ≥5 seconds, the secondary protection logic is triggered.

[0088] 3. Execution of hierarchical control logic:

[0089] 1) In the normal operation state, when the proximity switch signal period is stable and the motor current < I1, the PLC outputs a green - light signal, and the production line continues to run; at the same time, the PLC uploads the running state to the central control system through the Modbus TCP protocol.

[0090] 2) In the first - level warning state, if the loss of the proximity switch signal lasts for < 5 seconds or I1 ≤ motor current < I2, the PLC triggers the yellow - light flashing and the buzzer intermittent alarm; the PLC records the abnormal data, including the timestamp, current value, and signal - loss duration, into the historical database.

[0091] 3) In the secondary protection state, if the proximity switch signal is interrupted for ≥5 seconds or the motor current is ≥I2, the PLC will trigger the red light to stay on and the buzzer to continuously alarm; the PLC will generate a fault code and notify the maintenance personnel through the OPC server.

[0092] 4. Overload protection and reset operation:

[0093] 1) Disengagement response of friction torque limiting coupling: When the load torque exceeds the sliding threshold, the friction plate slides relative to the input sprocket / shaft sleeve, cutting off the power transmission; the PLC determines the coupling disengagement through the current surge signal and the loss of the proximity switch signal, and records the current value and running time at the moment of disengagement.

[0094] 2) Manual reset procedure: After the maintenance personnel confirm the reset status of the coupling, they press the reset button on the control cabinet. The PLC clears the fault code and restores power transmission.

[0095] After reset, the PLC automatically starts the reverse operation program of the chain conveyor belt, using a scraper to clean up residual smoke.

[0096] 5. Execution of adaptive maintenance strategy

[0097] 1) Delayed escalation of Level 1 warning: If the system does not recover to the I1 range within 10 minutes after the Level 1 warning is triggered, the PLC will automatically escalate to Level 2 protection status.

[0098] 2) When there are ≥3 Level 1 warnings in a single day, the PLC generates a maintenance work order, prompting maintenance personnel to lubricate the bearings or adjust the chain tension.

[0099] 3) Automatic cleaning after each production batch: After each production batch ends, the PLC controls the chain conveyor belt to run in reverse for 10-15 seconds, and the scraper guides the residual smoke into the drain waste tank.

[0100] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine, characterized in that, Includes chain mesh belt conveyor, friction torque limiting coupling, reducer, monitoring components, flow guide, waste drain and PLC control system; The chain mesh belt conveyor is installed inside the rear chamber of the loosening and rehumidifying machine. The friction torque limiting coupling is set between the drive sprocket shaft of the chain mesh belt conveyor and the output shaft of the reducer. The monitoring component is set on one side of the chain mesh belt conveyor. The guide shroud is funnel-shaped and connects the chain mesh belt conveyor and the drain waste trough. The PLC controller is electrically connected to the chain conveyor, the reducer, and the monitoring components.

2. The high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 1, characterized in that, The chain mesh belt conveyor includes a mesh belt, chain, drive sprocket, drive sprocket shaft, driven sprocket, driven sprocket shaft, small shaft and scraper; The mesh belt is formed by alternating arrangement and welding of toothed strips, left mesh strips and right mesh strips to form a diamond-shaped mesh. The small shaft is inserted into the mesh belt, and annular grooves are provided at both ends of the small shaft; The chain is a double-pitch roller chain, and its link holes cooperate with the annular grooves at both ends of the small shaft and are limited by cotter pins; The driving sprocket is connected to the driving sprocket shaft via a keyway, and the driven sprocket is connected to the driven sprocket shaft via a keyway. The active sprocket shaft is connected to a friction torque limiting coupling via a keyway, and the passive sprocket shaft is tensioned via a slider seat bearing. The scraper is fixed to the bottom support at the discharge end, and is inclined at a 45° angle to the mesh belt contact surface, with the end connected to a guide shroud.

3. The high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 2, characterized in that, The friction-type torque limiting coupling includes an output sprocket, a double-row chain, an input sprocket, friction plates, a disc spring, and a bushing. The output sprocket is connected to the drive sprocket shaft via a keyway, and the bushing is connected to the reducer output shaft via a keyway; the disc spring is located on one side of the friction plate, and the double-row chain is located on the output sprocket.

4. The high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 3, characterized in that, Friction torque limiting couplings also include pressure plates, bushings, adjusting bolts, and guide pressure plates.

5. The high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 2, characterized in that, The monitoring components include a rubber block, a sensing iron, a proximity switch, and a proximity switch bracket; the rubber block is coaxially mounted on the driven sprocket shaft, and the sensing iron is fixed on the rubber block; the proximity switch is fixed to the slider seat bearing via an L-shaped bracket.

6. The high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 1, characterized in that, The drain waste tank is equipped with a detachable filter screen with an inclination angle of 15-25 degrees, and a drain outlet is provided at the bottom of the drain waste tank.

7. A control method for a high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine based on any one of claims 1 to 6, characterized in that, Includes the following steps: S1, the PLC control system collects the periodic high-level signals of the proximity switch and the current data of the reducer motor in real time; S2 and PLC control system judge that if the proximity switch signal is periodically triggered and the current is less than the normal current threshold, it is in normal operation state; If the proximity switch signal is lost for less than 5 seconds, or if the normal current threshold is ≤ current < current warning threshold, a Level 1 warning state is activated. Abnormal data is recorded, and a reminder is issued that maintenance will be performed after all batches for the day are completed. If the proximity switch signal is lost for ≥5 seconds or the current is ≥ the current warning threshold, it is in the secondary protection state, and the machine will be shut down for maintenance after the current production batch ends.

8. The control method for the high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 7, characterized in that, In step S2, if the current does not return to the normal threshold within the set time after the first-level warning is triggered, the protection will be upgraded to the second-level protection state. If the first-level warning is triggered ≥ the set number of times in a single day, the PLC control system will generate a maintenance work order prompting lubrication or tension adjustment.

9. The control method for the high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 7, characterized in that, The proximity switch signal period is calculated by the PLC control system timer, and the signal loss judgment logic is based on the continuous pulse interval timeout trigger.

10. The control method for the high-efficiency anti-overload dehumidification device for a loosening and rehumidifying machine according to claim 7, characterized in that, It also includes an overload protection mechanism. When the torque limiting coupling disengages, the PLC control system records the current and duration at the moment of disengagement, and requires manual reset of the coupling and clearing of fault codes.

Images