A control system and method for leaf filament drying outlet moisture content

Abstract

This invention discloses a leaf drying outlet moisture control system and method, comprising: a material equalization device, an anti-sticking device, and a dehumidification control device arranged sequentially. The material equalization device includes: an adjustable chute and a material equalization plate above the discharge hopper; a first trough and material equalization nails below the discharge hopper; and a distributor at the front end of the first trough. The anti-sticking device includes: a first dehumidification pipe and a second dehumidification pipe respectively located on the upper parts of the inlet hood and the outlet hood; a first spray pipe, a filter screen, and a second spray pipe inside the outlet hood. The dehumidification control device includes: a roller; a dehumidification rotating screen is located on the upper part of the outlet hood; a second negative pressure pipe is located at the inlet of the dehumidification box; and a rectangular pipe with a rectangular adjusting plate is located between the second negative pressure pipe and the outlet pipe of the dehumidification rotating screen. The leaf drying outlet moisture control system and method provided by this invention improve the post-drying moisture standard deviation and deviation pass rate, enhance the product quality of leaf elasticity, curl, and filling value, and reduce the labor intensity of operators.

Description

Technical Field

[0001] This invention relates to the field of tobacco production technology, and in particular to a tobacco leaf drying outlet moisture control system and method. Background Technology

[0002] Currently, in the cigarette manufacturing industry, after the shredded leaves are cut on the production line, they are heated and humidified in a tunnel-type rehumidifier, and their volume expands rapidly to a moisture content of (22-25)%. Then, they are sent by a vibrating conveyor to a thin-plate drying machine, where they exchange heat with the cylinder wall and hot air after being heated by steam. After absorbing heat, the moisture in the shredded leaves evaporates, and the high-temperature and high-humidity process exhaust gas formed inside the drum is discharged outdoors through the dehumidification pipe. This completes the dehydration and drying of the shredded leaves, with the moisture content controlled at (13±0.5)%, in order to meet the inherent process requirements of leaf elasticity, curl, and filling value.

[0003] During the drying process, the cylinder wall and hot air temperatures, as well as the frequency of the exhaust fan, are essentially fixed. Moisture control is primarily achieved by adjusting the opening of the exhaust duct damper using a pneumatic actuator to control the amount of moisture drawn from the cylinder. The pneumatic actuator uses compressed air as its air source. Due to the compressibility of gas, the negative pressure created within the cylindrical duct during exhaust fan operation causes significant resistance during flap adjustment, resulting in incomplete and inaccurate execution. The controller feedback consistently shows fluctuating values, causing moisture levels at the dryer outlet to fluctuate. This leads to persistently unacceptable moisture content deviations and process control issues, severely impacting product quality and compliance with standardization requirements, and increasing the workload of operators.

[0004] Therefore, there is an urgent need for a control system and method for the moisture content of leaf filament drying outlet. Summary of the Invention

[0005] The purpose of this invention is to provide a leaf drying outlet moisture control system and method to solve the problems in the prior art, improve the moisture content deviation and pass rate after drying, enhance the elasticity, curl and filling value of leaf products, and reduce the labor intensity of operators.

[0006] This invention provides a leaf filament drying outlet moisture control system, comprising:

[0007] The following components are sequentially installed: a material distribution device for the electronic scale used for feeding filaments, a moisture-removing hood and anti-sticking device for the tunnel-type rehumidifier for filaments, and a moisture control device for the thin-plate filament drying machine.

[0008] The blade electronic scale material distribution device includes: an electronic scale belt for conveying blades, a measuring tube at the top of one end of the electronic scale belt, and a material hopper at the side of the other end of the electronic scale belt; a discharge hopper inside the discharge hopper, an adjustable chute with an adjustable tilt angle above the discharge hopper, a material distribution plate above the adjustable chute, the cross-sectional area of ​​the material distribution plate being smaller than the cross-sectional area of ​​the adjustable chute so that the blades on the material distribution plate can slide onto the adjustable chute; an openable and closable gate at the front end of the discharge hopper; a first trough below the discharge hopper, a plurality of height-adjustable material distribution nails arranged at the upper part of the first trough along the blade forward direction, and a material distributor at the front end of the outlet of the first trough.

[0009] The anti-sticking device for the leaf-filament tunnel-type rehumidifier includes: a tunnel-type rehumidifier, wherein a second trough inclined downwards from the inlet to the outlet is provided inside the tunnel-type rehumidifier; a tunnel-type rehumidifier inlet hood is provided above the inlet end of the tunnel-type rehumidifier; a tunnel-type rehumidifier outlet hood is provided at the outlet end of the tunnel-type rehumidifier; a first dehumidification pipe is provided above the inlet hood of the tunnel-type rehumidifier; a second dehumidification pipe is provided above the outlet hood of the tunnel-type rehumidifier; the second dehumidification pipe is connected to the first dehumidification pipe; and a first [missing information - likely a type of drainage system] is provided between the inlet hood of the tunnel-type rehumidifier and the first dehumidification pipe. A second desiccation damper is provided between the discharge hood of the tunnel rehumidifier and the second desiccation pipe. Inside the discharge hood of the tunnel rehumidifier, from top to bottom, are arranged a first spray pipe, a filter screen, and a second spray pipe. The first spray pipe is used to spray the filter screen, and the second spray pipe is liftable and used to spray the inner wall of the discharge hood. A heat exchanger is provided outside the discharge hood of the tunnel rehumidifier, connected to the first and second spray pipes, to provide hot air to them. An outlet vibration groove is provided below the discharge hood of the tunnel rehumidifier.

[0010] The dehumidification control device for the thin-plate drying machine includes: a roller, with a drying machine feed hood at the inlet end and a drying machine discharge hood at the outlet end; a dehumidification rotating screen is installed above the drying machine discharge hood; a first dehumidification fan and a dehumidification box are sequentially installed on the second floor, connected by a first negative pressure pipe; a second negative pressure pipe is installed at the inlet of the dehumidification box; a rectangular pipe is installed between the second negative pressure pipe and the outlet pipe of the dehumidification rotating screen; a sliding rectangular... A rectangular adjusting plate is provided, with a lead screw vertically mounted above it. An electric converter is located on one side of the upper part of the rectangular pipe. A retractable scale is mounted horizontally on the upper part of the electric converter, and the retractable scale is used to detect the vertical movement distance of the lead screw. A worm wheel is located at the top of the lead screw, and a worm shaft is located at the end of the worm wheel. A worm is located outside the worm shaft, and the worm is coaxial with the worm shaft. A swing arm is connected to the worm shaft, and a second cylinder is connected to the top of the swing arm. A tension spring is connected to the lower end of the swing arm.

[0011] The material distribution device at the electronic scale for the filament falling position is connected to the tunnel-type rehumidifier of the filament tunnel-type rehumidifier through the material distributor; the anti-sticking device of the filament tunnel-type rehumidifier is connected to the feed hood of the drying machine of the thin plate drying machine through a vibrating conveyor that is set below the outlet vibrating groove and inclined upwards.

[0012] In the leaf drying outlet moisture control system described above, preferably, the leaf electronic scale material feeding device further includes a first protective cover, the electronic scale belt is disposed inside the first protective cover, and the limiting tube is disposed above the first protective cover; a first support is disposed below the first protective cover, the first support is located on the ground and is connected to the first protective cover by a first bolt; the feeding hopper is fixed to the internal thread of the first protective cover by a first screw located on the upper part of the first protective cover; a second support is disposed below the first trough, the first trough... The body is connected to the frame and the balance body via a rocker arm. The second support is located on the ground and is connected to the balance body via a second bolt. The material distribution plate is fixed to the upper part of the adjustable chute by a second screw. The adjustable chute is fixed to the upper part of the feed hopper via a first hinge. An adjusting screw is provided on the outer side of the adjustable chute, passing through the feed hopper and the discharge hopper and extending to the outside of the discharge hopper. A handle is provided at the end of the adjusting screw. An adjusting nut is provided on the outer side of the adjusting screw at the connection position with the feed hopper. The angle between the adjustable chute and the vertical direction is in the range of 30°-75°.

[0013] In the leaf drying outlet moisture control system described above, preferably, the valve is fixed to the hopper by a second hinge, wherein the second hinge is welded to the upper front end of the hopper and is arranged horizontally; sealing plates are provided on the left and right sides of the valve, and each sealing plate is fixed to the hopper by a third screw; a photoelectric bracket is provided on the side of the hopper, and the photoelectric bracket is fixed to the side of the hopper by a fourth screw; a photoelectric detector is installed on the photoelectric bracket, the photoelectric detector is connected to a controller, and a first circular hole is provided at the lower end of the photoelectric bracket, and the photoelectric detector is locked in the first circular hole of the photoelectric bracket by a first nut; a first cylinder is provided at the front end of the valve, the first cylinder is connected to the controller, one end of the first cylinder is connected to a piston rod, and the other end of the first cylinder is fixed to the base. The base is located at the lower part of the fixing frame and is fixed to the fixing frame by a fifth screw. Second circular holes are respectively provided at corresponding positions on both sides of the connection between the first cylinder and the base. A first through pin is provided in the second circular hole of the first cylinder and the base. The upper end of the first through pin is locked to the base and the first cylinder by a first locking piece. A fixing seat is provided on the end face of the valve. The fixing seat is fixed to the end face of the valve by a sixth screw. A U-shaped groove is provided in the middle of the fixing seat. The piston rod is located in the U-shaped groove of the fixing seat and is connected to the fixing seat by a second through pin. A third circular hole is provided at the corresponding position of the fixing seat and the piston rod. The second through pin is located in the third circular hole of the fixing seat and the piston rod, and the second through pin is connected and locked to the fixing seat and the piston rod by a second locking piece.

[0014] In the blade drying outlet moisture control system described above, preferably, there are four equal-spaced material distribution nails, staggered in all directions, each nail is arc-shaped with its arc surface facing the blade's forward direction; each nail has a lead screw at its tail end, and a second nut is provided at the bottom of the first trough corresponding to the lead screw of each nail. Each lead screw is screwed into the corresponding second nut and fixed to the first trough. By screwing in the second nut, the height of the material distribution nail in the first trough can be adjusted. The distributor consists of multiple steel bars arranged parallel to the blade's forward direction, each steel bar having a diameter of 1.5mm-2.5mm and made of stainless steel. The spacing between adjacent steel bars is 40mm-50mm, and one end of each steel bar is bent at 45° and uniformly welded to the upper part of the first trough along its width.

[0015] In the leaf drying outlet moisture control system described above, preferably, the first spray pipe includes a main pipe located outside the discharge hood of the tunnel rehumidifier and having a downwardly bent right-angle structure, and four branch pipes located inside the discharge hood of the tunnel rehumidifier and evenly distributed horizontally. Each branch pipe of the first spray pipe has a plurality of first conical holes evenly distributed vertically downwards, wherein the diameter of the first conical holes is 1.5mm-2.5mm. The second spray pipe consists of one pipe distributed horizontally, and the second spray pipe has a plurality of second conical holes evenly distributed downwards at an angle of 30°-60° between the second conical holes and the inner wall of the discharge hood of the tunnel rehumidifier. The branch pipes are inserted through a round hole on one side of the tunnel rehumidifier discharge hood and into a groove on the other side of the tunnel rehumidifier discharge hood to limit and fix the first jet pipe. The connections of the four branch pipes of the first jet pipe to the main pipe and the tunnel rehumidifier discharge hood are sealed with felt. The filter screen is rectangular in shape and has multiple round holes evenly distributed on its surface. Reinforcing ribs are welded around the filter screen. The connection between the filter screen and the tunnel rehumidifier discharge hood is sealed with a brush. The filter screen is inserted through a long hole on one side of the tunnel rehumidifier discharge hood and into a groove on the other side of the tunnel rehumidifier discharge hood to limit and fix the filter screen. A solenoid valve is installed on the main pipe of the first jet pipe. The solenoid valve is connected to a controller, which controls the intermittent opening of the solenoid valve.

[0016] In the leaf drying outlet moisture control system described above, preferably, the heat exchanger is connected to the second jet pipe via a hot air duct and a metal hose arranged sequentially, and the metal hose is located inside the discharge hood of the tunnel rehumidifier. The joint between the metal hose and the second jet pipe is sealed by a first locking nut. A hot air fan is provided between the hot air duct and the heat exchanger, and the heat exchanger and the hot air fan are connected to a controller. The hot air duct is also connected to the first jet pipe. A first electric damper is provided on the hot air duct and is connected to the controller. The hot air duct is connected to the first jet pipe via a first flange. A steam coil is provided inside the heat exchanger. An anemometer is provided inside the second exhaust duct and is connected to the controller. The controller is used to control the opening degree of the first electric damper based on the detection result of the anemometer. A second electric damper is provided inside the hot air duct and is connected to the controller.

[0017] In the leaf drying outlet moisture control system described above, preferably, the tunnel-type rehumidifier is provided with a second trough sloping downwards from the inlet to the outlet. The discharge hood of the tunnel-type rehumidifier is equipped with two rodless cylinders respectively located at both ends of the second jet pipe for driving the second jet pipe to rise and fall. Each rodless cylinder is connected to a controller, and a slider is provided on the upper part of each rodless cylinder. Both ends of the second jet pipe are respectively fixed to the upper part of the slider of each rodless cylinder by fixing clamps. The tunnel-type rehumidifier is provided with a top cover plate, and an inspection door is provided on the side of the tunnel-type rehumidifier. A third support is provided below the machine to support the tunnel-type rehumidifier or the outlet vibrating trough. The inner and outer sides of the discharge hood of the tunnel rehumidifier are provided with first sealing brushes. The starting end of the first exhaust pipe is a downward-curved arc structure, and the end of the first exhaust pipe is an upward-curved elbow structure. The end of the elbow structure is connected to a second exhaust fan. A condensate drain pipe is provided below the elbow structure, and a water collection box is provided below the condensate drain pipe. The water collection box is connected to a drain hose. A fixing lug is provided on the inner edge of the top of the water collection box. The fixing lug is fixed to the surface of the first exhaust pipe by fixing screws.

[0018] In the leaf filament drying outlet moisture control system described above, preferably, the roller is mounted on a fourth support located on the ground; the inner ring of the worm gear is threaded and engages with the screw thread; the outer thread of the worm gear meshes with the worm; the worm and the worm shaft are connected by a key; the swing arm is located in the square hole on the end face of the worm shaft, and the square hole of the swing arm is connected to the worm shaft by a key; a first fixing frame is provided on the upper part of the rectangular pipe opposite to the electric converter; the first fixing frame is welded to the rectangular pipe as a whole; the two ends of the tension spring are respectively located in the circular holes of the swing arm and the first fixing frame; A second fixed frame is installed above the outlet pipe of the de-icing and netting system. A second cylinder is located above the second fixed frame and is fixed to it with bolts. The piston rod of the second cylinder is connected to the circular hole of the swing arm via a pin and a locking plate. An arc-shaped hole is provided on the edge of the second cylinder near the swing arm, allowing adjustment of the swing arm's position within the arc-shaped hole. After adjustment, the swing arm is fixed with a second locking nut. A second protective cover is installed on the upper part of the rectangular pipe, and the second protective cover is connected to the rectangular pipe with screws. Acrylic glass plates are installed on both sides of the second protective cover. The plexiglass plate is connected to the second protective cover by screws; the worm gear, the worm, the swing arm, the worm shaft, the tension spring, the first fixing frame, and the lead screw are located inside the second protective cover, and one end of the worm shaft is fixed to the second protective cover by a bearing seat; a desiccant motor is provided on one side of the first desiccant fan to drive the first desiccant fan to rotate, and the desiccant motor is coaxially connected to the first desiccant fan; the first negative pressure pipe is connected to the inlet of the first desiccant fan and the outlet of the desiccant box through a second flange; both ends of the rectangular pipe are connected to the second negative pressure pipe and the desiccant box through a third flange. The outlet pipe of the dehumidification and transfer screen is connected, and the third flange is bolted to the second negative pressure pipe. Several flange holes are provided around the third flange, and the second negative pressure pipe is connected to the rectangular pipe by bolts passing through these flange holes. U-shaped graphite grooves are provided on the inner walls of both sides of the rectangular pipe, and the rectangular adjusting plate can slide within the U-shaped graphite grooves. The dehumidification and transfer screen is fixed to the discharge hood of the drying machine via bearing seats. The second negative pressure pipe is sealed to the dehumidification box via a flange located inside the second negative pressure pipe. A rotary joint for providing steam and discharging condensate is provided at the middle of the outer side of the discharge hood of the drying machine.

[0019] In the leaf drying outlet moisture control system described above, preferably, a U-shaped groove is provided on the upper part of the rectangular adjusting plate; a copper sleeve is provided in the inner hole of the rectangular adjusting plate and the U-shaped groove, and the copper sleeve is interference-fitted with the inner hole of the rectangular adjusting plate and the U-shaped groove; a smooth axis screw is provided in the circular hole of the U-shaped groove and the copper sleeve, and the smooth axis screw is interference-fitted with both the U-shaped groove and the copper sleeve; a special-shaped nut and an externally threaded screw are provided on the outer side of the U-shaped groove, and the special-shaped nut and the externally threaded screw are connected by a thread. The screw is screwed in and locked; a cotter pin is provided in the groove of the shaped nut, and the cotter pin passes through the screw hole of the external threaded screw and locks into the groove opening; a butterfly spring is provided on the optical axis of the optical axis screw at the slot position of the U-shaped groove, and the inner ring of the butterfly spring is located on the optical axis of the optical axis screw; a sealing chamber is provided on the upper part of the U-shaped groove, and the sealing chamber is machined integrally with the U-shaped groove; an optical axis is provided vertically inside the sealing chamber, the optical axis is located below the screw, and is machined integrally with the screw. The optical axis is integrally formed; a pair of rolling bearings spaced vertically on the optical axis, and the rolling bearings are interference-fitted with the optical axis; a spacer is fitted on the optical axis between the two rolling bearings, and the spacer is clearance-fitted with the optical axis; a retaining ring is provided below the lower rolling bearing, and a retaining ring groove is formed on the lower end sidewall of the optical axis, with the retaining ring disposed in the retaining ring groove; two thrust ball bearings are arranged horizontally below the optical axis, and the thrust ball bearings roll and rub against the optical axis; the upper part of the sealing chamber is provided with A split-type pressure cap has screws on both sides of the optical axis on its upper part. The screws are threadedly connected to the sealing chamber to seal the split-type pressure cap to the sealing chamber. The interface between the rectangular adjusting plate and the rectangular pipe is sealed by a second sealing brush. The second sealing brush has a grooved support. An adjusting screw is provided on the upper part of the rectangular pipe, and the adjusting screw is screwed into the internal threaded hole of the grooved support of the second sealing brush. The electric converter and the second cylinder are connected to the controller.

[0020] The present invention also provides a method for controlling the moisture content at the outlet of leaf drying, comprising the following steps:

[0021] After being cut, the leaf filaments enter the limiting tube of the equalization device at the leaf filament electronic scale. When the leaf filaments reach the preset thickness, they follow the direction of the electronic scale belt and enter the discharge hopper. After the pile of leaf filaments enters the discharge hopper, they are loosened and evenly distributed in different ways by the equalization plate, equalization nails and distributor. Under the action of the distributor, they slide down into the leaf filament tunnel type rehumidifier dehumidification hood anti-sticking device.

[0022] After being cut, the leaf filaments enter the second tank of the tunnel rehumidifier through the feed hood. They come into contact with high-temperature, high-humidity steam, causing the filaments to expand rapidly. Excess steam and soot are discharged outdoors through the first and second exhaust pipes. The pressure balance within the chamber is maintained by adjusting the opening of the first and second exhaust dampers. The rapidly expanding filaments fall onto the outlet vibrating trough below the discharge hood of the tunnel rehumidifier as the tank reciprocates, entering the dehumidification control device of the thin-plate drying machine. Simultaneously, hot air is generated through the heat exchanger and splits into two paths. One path enters the first blowpipe to blow air onto the filter screen; the other path enters the second blowpipe, blowing air onto the entire inner wall of the discharge hood of the tunnel rehumidifier as it moves up and down. This rapidly dries the steam condensate on the inner wall of the discharge hood, reducing the adhesion of leaf filaments and soot to the inner wall.

[0023] Before the filaments enter the dehumidification control device of the thin-plate drying machine, the drum is preheated. The dehumidification motor drives the first dehumidification fan to rotate. As the drum rotates, the hot air fan starts, and the rectangular adjustment plate opens to a preset degree to maintain the gas balance inside the drum. When the temperature of the drum reaches the set value, the machine switches from preheating to production mode. The filaments enter the high-temperature drum through the tunnel-type rehumidifier and exchange heat with the drum wall and hot air. The first dehumidification fan rotates and creates negative pressure in the first and second negative pressure pipes, drawing the moisture and dust generated by the filaments during heat exchange into the dehumidification box, where they are filtered through a cloth bag and discharged outdoors. At the same time, the opening of the rectangular adjustment plate is adjusted according to the comparison between the set outlet moisture value and the actual moisture meter reading to automatically regulate the outlet moisture of the drying machine.

[0024] This invention provides a moisture control system and method for leaf drying outlet. Through uniform distribution and timely loosening, the system addresses the problem of uneven moisture absorption and insufficient volume expansion caused by inconsistent supply of leaf fibers during the descent of piled-up leaf fibers into the tunnel rehumidifier. This is achieved by using orderly installed material distribution plates, nails, and distributors on the leaf fiber electronic weighing drop position, which disperse and distribute the fibers evenly and promptly. This solves the problem of inconsistent supply during the descent of piled-up leaf fibers, leading to uneven moisture absorption and insufficient volume expansion, resulting in substandard leaf fiber filling value after drying. Furthermore, the system rapidly dries the steam condensate on the inner wall of the discharge hood by orderly installed dehumidification filters and a spray device on the inner wall of the discharge hood, reducing the adhesion of leaf fibers and dust to the inner wall. This also prevents the filter from clogging and affecting the smooth flow of the dehumidification system, reducing steam overflow. This successfully solves the long-standing problem of filter blockage caused by steam carrying leaf fibers and dust into the discharge hood of tunnel rehumidifiers, thus reducing the impact on the dehumidification system. Steam overflow ensures a clean and tidy work environment; it also solves the problem of steam condensing on the inner wall of the discharge hood due to the temperature difference between the inside and outside, causing it to adhere to the blades and fall off, thus reducing the flow of defective products into the next process; the high integration of electrical and mechanical systems serves as the power source for the rectangular regulating plate, and adds the function of damper on / off detection and feedback. The actuator has been changed from a circular flap to a rectangular regulating plate, ensuring more precise on / off control within the rectangular pipe, allowing for timely and accurate discharge of moisture from the drying machine drum, thereby ensuring stable moisture content at the drying machine outlet. This successfully solves the problem of the negative pressure state in the dehumidification pipe during the drying machine production process, which affects the control accuracy of the dehumidification damper, ensuring timely and accurate discharge of moisture from the drying machine drum, thus ensuring stable moisture content at the drying machine outlet; it improves the post-drying moisture content deviation and pass rate, while significantly improving the product quality of blade elasticity, curl, and filling value, reducing the labor intensity of operators frequently intervening and adjusting moisture control. Attached Figure Description

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the dehumidification damper control system for a thin-plate wire drying machine provided by the present invention;

[0027] Figure 2 A schematic diagram of the material distribution device at the feeding position of the electronic scale for leaf wires;

[0028] Figure 3 for Figure 3 A schematic diagram of direction A;

[0029] Figure 4 for Figure 3 A schematic diagram of direction B;

[0030] Figure 5A schematic diagram of the structure of an embodiment of the anti-sticking material device for the dehumidification hood of a blade tunnel type rehumidifier;

[0031] Figure 6 for Figure 6 A schematic diagram of direction C;

[0032] Figure 7 for Figure 6 A schematic diagram of direction B;

[0033] Figure 8 for Figure 6 A schematic diagram of direction A;

[0034] Figure 9 A schematic diagram of a moisture control device for a thin sheet drying machine;

[0035] Figure 10 for Figure 10 A cross-sectional view along direction D;

[0036] Figure 11 A flowchart illustrating an embodiment of the leaf drying outlet moisture control system and method provided by the present invention.

[0037] Reference numerals: 30-First protective cover, 31-Limiting tube, 32-First screw, 33-Feed hopper, 34-Sealing plate, 35-Base, 36-First through pin, 37-First cylinder, 38-Valve, 39-Photoelectric bracket, 40-Photoelectric detector, 41-Equalizing plate, 42-Adjustable chute, 43-Adjusting screw, 44-Feed hopper, 45-Electronic scale belt, 46-Handle, 47-Adjusting nut, 48-First bracket, 49-First trough, 50-Second bracket, 51-Equalizing nail, 52-Second nut, 53-Distributor, 54-Second hinge, 55-Fixed seat, 56-Second through pin, 57-Piston rod, 58-Tunnel rehumidifier feed hood, 59-First dehumidification damper 60-First exhaust pipe, 61-Top cover plate, 62-Inspection door, 63-Tunnel rehumidifier discharge hood, 64-Second exhaust pipe, 65-Second exhaust damper, 66-Fixing screw, 67-Fixing lug, 68-Condensate drain pipe, 69-Water collection box, 70-First spray pipe, 71-Filter screen, 72-Second spray pipe, 73-First sealing brush, 74-Solenoid valve, 75-First flange, 76-Heat exchanger, 77-First electric damper, 78-Fixing clamp, 79-Rodless cylinder, 80-First locking nut, 81-Metal hose, 82-Hot air pipe, 83-Hot air fan, 84-Steam coil, 85-Outlet vibrating trough, 86-Third support, 87-Tunnel rehumidifier 88-Anemometer, 91-Second Electric Damper, 92-Desiccation Motor, 93-First Desiccation Fan, 94-First Negative Pressure Pipe, 95-Second Flange, 96-Desiccation Box, 97-Second Negative Pressure Pipe, 98-External Threaded Screw, 99-Butterfly Spring, 100-Second Protective Cover, 101-Acrylic Glass Plate, 102-Worm Gear, 103-Worm, 104-Swing Arm, 105-Worm Shaft, 106-Tension Spring, 107-Second Cylinder, 108-First Fixing Frame, 109-Third Flange, 110-Screw, 111-Extendable Scale, 112-Electric Converter, 113-Screw, 114-Split Cover, 115-Sealed Chamber, 116-Rolling Bearing, 117-Rectangular Adjusting plate, 118-U-shaped graphite trough, 119-Second sealing brush, 120-Adjusting screw, 121-Dehumidifying rotating screen, 122-Drying machine discharge hood, 123-Roller, 124-Fourth bracket, 128-Copper sleeve, 129-Spacer sleeve, 130-Irregular nut, 131-Cotter pin, 132-Optical shaft, 133-Snap ring, 134-Thrust ball bearing, 135-U-shaped trough, 136-Optical shaft screw, 137-Rectangular pipe, 138-Second locking nut, 139-Arc-shaped hole, 140-Flange hole, 141-Second dehumidifying fan, 142-Second trough body, 143-Vibrating conveyor, 144-Drying machine feed hood, 145-Rotary joint, 146-Second fixed frame. Detailed Implementation

[0038] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0039] The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as “including” or “contains” mean that the element preceding the term encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as “above” and “below” are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0040] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0041] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0042] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0043] Currently, in the cigarette manufacturing industry, the cut tobacco leaves on the production line are fed into the limiting tube by a belt conveyor and reach the upper part of the electronic scale belt. As the belt conveyor operates, the leaves fall onto the trough of the vibrating conveyor below. Through the reciprocating motion of the vibrating conveyor, the tobacco leaves are sent into the tunnel-type rehumidifier for expansion treatment by exchanging heat with steam.

[0044] Because the electronic scale operates in constant flow control mode, the blades are required to be stored at a certain height within the limiting tube to ensure continuous and stable flow. However, due to flow limitations, the scale operates at a relatively slow speed. The compacted blades reach a stack height of 300mm on the scale belt. Influenced by thickness and speed, the blades clump together during their descent, falling onto the vibrating conveyor trough. The 1000mm height difference between the scale belt and the vibrating conveyor trough further slows the blade descent, disrupting the proper sequence of descent. This results in intermittent supply of the clumped blades as the conveyor reciprocates. The unevenly thick blades enter the blade tunnel-type rehumidifier, where steam is introduced into the tunnel-type vibrating trough cavity via steam coils. The trough's bottom plate has numerous precision-machined steam nozzles arranged in a crisscross pattern. Under the combined effects of mechanical vibration and saturated steam injection, the blades rapidly tumble and absorb heat, mixing thoroughly with the steam. This uneven steam absorption by the blades prevents sufficient expansion during heating and humidification, affecting the fluctuation of the outlet moisture temperature.

[0045] Meanwhile, during the expansion of the blades and steam within the tunnel-type rehumidifier cavity, the process requires a steam pressure of no less than 4 MPa. The high-temperature, high-humidity steam comes into contact with the blades within the tunnel-type rehumidifier channel. The blades cannot absorb all the steam; excess steam is drawn into a centralized deodorization treatment system via the exhaust fan in the discharge hood. Because the steam's pressure is not fully released upon entering the discharge hood, it still possesses a certain pressure and high heat. Inside the discharge hood, the steam mixes with some blade material and dust, partially clogging the filter mesh of the dehumidification system. This leads to poor ventilation, causing excessive steam to remain in contact with the blades for an extended period within the dehumidification hood, resulting in the blades absorbing excessive moisture. Simultaneously, steam overflows, affecting the surrounding environment.

[0046] Because some filters were clogged, steam inside the dehumidification hood was not completely removed. Simultaneously, the high temperature and temperature difference with the outside created condensation, causing the steam to rapidly condense on the inner wall of the discharge hood. Some floating tobacco leaves quickly adhered to the inner wall, absorbing moisture over time to form water-stained tobacco. Once this water reached a certain thickness, it quickly detached, reaching a moisture content of approximately 30%, severely exceeding the standard. The high-moisture tobacco leaves and dust then tumbled inside the drying machine, forming water-stained balls, causing fluctuations in outlet moisture content and the formation of yellow-stained tobacco after rolling.

[0047] After passing through a tunnel-type rehumidifier, the filaments rapidly expand in volume, reaching a moisture content of (22-25)%. They are then conveyed by a vibrating conveyor into a thin-plate drying machine where they exchange heat with the steam-heated drum wall and hot air. The filaments absorb heat, causing the moisture to evaporate. High-temperature, high-humidity process exhaust gas is generated inside the drum and discharged outdoors through an exhaust pipe. The moisture content of the filaments is controlled within (13±0.5)%. During the drying process, the drum wall and hot air temperatures, as well as the exhaust fan frequency, remain relatively constant. Moisture control is achieved by adjusting the opening of the exhaust pipe damper using a pneumatic actuator to regulate the amount of moisture drawn from the drum. The pneumatic actuator uses compressed air as its air source. Due to the compressibility of gas, the negative pressure formed in the cylindrical pipe during the operation of the dehumidifying fan causes the flap to experience significant resistance during switching and adjustment, resulting in incomplete and inaccurate execution. The controller feedback values ​​always show fluctuations, causing fluctuations in the moisture content at the outlet of the drying machine, as well as differences in the elasticity, crimp, and filling value of the filaments. This fails to meet the process requirements, leading to deviations in the process control moisture content from the acceptable level. This seriously affects product quality and homogenization requirements, and increases the labor intensity of operators.

[0048] like Figure 1 As shown, the leaf filament drying outlet moisture control system provided in this embodiment of the invention includes: a leaf filament electronic scale material feeding position equalization device, a leaf filament tunnel-type rehumidifier dehumidification hood anti-sticking device, and a thin plate drying machine dehumidification control device arranged sequentially, wherein,

[0049] like Figures 2-4 As shown, the leaf wire electronic scale material distribution device includes: an electronic scale belt 45 for conveying leaf wires, a measuring tube 31 at the top of one end of the electronic scale belt 45, and a dropping hopper 33 on the side of the other end of the electronic scale belt 45; a discharge hopper 44 is provided inside the dropping hopper 33, the two sides of the discharge hopper 44 are fixedly connected to the dropping hopper 33, the top of the discharge hopper 44 is located at the lower right of the electronic scale belt 45, the discharge hopper 44 is used to receive the leaf wires falling from the electronic scale belt 45, and a material distribution device is provided above the discharge hopper 44. An adjustable chute 42 with an adjustable tilt angle is provided. A material distribution plate 41 is provided above the adjustable chute 42. The cross-sectional area of ​​the material distribution plate 41 is smaller than that of the adjustable chute 42, so that the blades on the material distribution plate 41 can slide onto the adjustable chute 42. The front end face of the discharge hopper 33 is provided with an openable and closable gate 38. A first trough 49 is provided below the discharge hopper 33. Several height-adjustable material distribution nails 51 are provided on the upper part of the first trough 49 along the blade forward direction. A distributor 53 is provided at the front end of the outlet of the first trough 49.

[0050] like Figures 5-8As shown, the anti-sticking device for the dehumidification hood of the leaf filament tunnel rehumidifier includes: a tunnel rehumidifier 87, wherein a second trough 142 inclined downward from the inlet to the outlet is provided inside the tunnel rehumidifier 87; a tunnel rehumidifier inlet hood 58 is provided at the upper part of the inlet end of the tunnel rehumidifier 87; a tunnel rehumidifier outlet hood 63 is provided at the outlet end of the tunnel rehumidifier 87; a first dehumidification pipe 60 is provided at the upper part of the tunnel rehumidifier inlet hood 58; a second dehumidification pipe 64 is provided at the upper part of the tunnel rehumidifier outlet hood 63; the second dehumidification pipe 64 is connected to the first dehumidification pipe 60; and a first dehumidification damper is provided between the tunnel rehumidifier inlet hood 58 and the first dehumidification pipe 60. 59. A second dehumidification damper 65 is provided between the tunnel rehumidifier discharge hood 63 and the second dehumidification pipe 64; inside the tunnel rehumidifier discharge hood 63, a first spray pipe 70, a filter screen 71, and a second spray pipe 72 are arranged from top to bottom. The first spray pipe 70 is used to spray the filter screen 71, and the second spray pipe 72 is liftable and used to spray the inner wall of the tunnel rehumidifier discharge hood 63. A heat exchanger 76 is provided outside the tunnel rehumidifier discharge hood 63. The heat exchanger 76 is connected to the first spray pipe 70 and the second spray pipe 72 and is used to provide hot air to the first spray pipe 70 and the second spray pipe 72; an outlet vibration groove 85 is provided below the tunnel rehumidifier discharge hood 63.

[0051] like Figures 9-10As shown, the dehumidification control device of the thin plate drying machine includes: a roller 123, with a drying machine feed hood 144 at the inlet end of the roller 123, a drying machine discharge hood 122 at the outlet end of the roller, and a dehumidification rotating screen 121 on the upper part of the drying machine discharge hood 122; a first dehumidification fan 93 and a dehumidification box 96 are sequentially arranged on the second floor, connected by a first negative pressure pipe 94, with a second negative pressure pipe 97 at the inlet of the dehumidification box 96, and a rectangular pipe 137 between the second negative pressure pipe 97 and the outlet pipe of the dehumidification rotating screen 121; the rectangular pipe 137 is internally arranged with... A sliding rectangular adjustment plate 117 is provided, and a lead screw 110 is vertically arranged above the rectangular adjustment plate 117. An electric converter 112 is arranged on one side of the upper part of the rectangular pipe 137. A telescopic scale 111 is arranged horizontally on the upper part of the electric converter 112. The telescopic scale 111 is used to detect the vertical movement distance of the lead screw 110. A worm wheel 102 is arranged at the top of the lead screw 110. A worm shaft 105 is arranged at the end of the worm wheel 102. A worm 103 is arranged outside the worm shaft 105, and the worm 103 is coaxial with the worm shaft 105. A swing arm 104 is connected to the worm shaft 105. A second cylinder 107 is connected to the top of the swing arm 104, and a tension spring 106 is connected to the lower end of the swing arm 104.

[0052] The material distribution device at the electronic scale for the filament falling position is connected to the tunnel-type rehumidifier 87 of the filament tunnel-type rehumidifier dehumidification hood anti-sticking device via the material distributor 53; the filament tunnel-type rehumidifier dehumidification hood anti-sticking device is connected to the drying machine feed hood 144 of the thin plate drying machine dehumidification control device via a vibrating conveyor 143 located below the outlet vibrating trough 85 and inclined upward.

[0053] The material distribution device for the electronic scale's blade sheath also includes a first protective cover 30, which is connected to the electronic scale frame via a hinge and is only opened during routine maintenance. The electronic scale belt 45 is located inside the first protective cover 30 and transmits load between the drive and driven shafts. A limiting tube 31 is positioned above the first protective cover 30 and is connected to the flange of the feed conveyor hopper. Cut blade sheaths enter the limiting tube 31, and a photoelectric detection device controls the accumulation of sheath sheaths within the limiting tube 31 to a certain height to ensure the weight distribution is maintained. The flow rate of the blades on the electronic scale belt 45 is stable during weighing; a first support 48 is provided below the first protective cover 30, the first support 48 is located on the ground and is connected to the first protective cover 30 by a first bolt; the discharge hopper 33 is fixed to the internal thread of the first protective cover 30 by a first screw 32 located on the upper part of the first protective cover 30; a second support 50 is provided below the first trough 49, the first trough 49 is connected to the frame and the balance body by a rocker arm, the second support 50 is located on the ground and is connected to the balance body by a second bolt.

[0054] Furthermore, the material distribution plate 41 and the adjustable chute 42 are located inside the discharge hopper 33. The width of the adjustable chute 42 is the same as the width of the discharge hopper. The material distribution plate 41 is dovetail-shaped, and its width is 1 / 3 to 2 / 3 of the width of the adjustable chute 42. The material distribution plate 41 is centrally located above the adjustable chute 42. The horizontal length of the material distribution plate 41 is the same as the length of the adjustable chute 42 and is 1 / 2 to 2 / 3 of the width of the discharge hopper 33. The material distribution plate 41 is fixed to the upper part of the adjustable chute 42 by a second screw. The bottom of the adjustable chute 42 is arc-shaped (the arc can be, for example, 30°) to facilitate the sliding of the blades. The blades entering the discharge hopper 33 first fall on the dovetail of the material distribution plate 41. The blades slide down the spine to both sides of the equalizing plate 41. After being distributed by the equalizing plate 41, the blades fall along the adjustable chute 42. The adjustable chute 42 is fixed to the upper part of the feed hopper 44 by the first hinge. An adjusting screw 43 is provided on the outside of the adjustable chute 42, passing through the feed hopper 44 and the discharge hopper 33 and extending to the outside of the discharge hopper 33. A handle 46 is provided at the end of the adjusting screw 43. An adjusting nut 47 is provided on the outside of the adjusting screw 43 at the connection position with the feed hopper 44. The adjusting nut 47 is located on the outside of the feed hopper 44 and is welded to the outer surface of the round hole of the feed hopper 44. The angle between the adjustable chute 42 and the vertical direction is in the range of 30°-75°. In practice, by rotating the handle 46, the adjusting screw 43 is screwed into the adjusting nut 47 welded to the panel of the hopper 44, which can adjust the tilt angle of the adjustable slide 42. By moving the adjustable slide 42 back and forth, the material distribution plate 41 fixed on the upper part of the adjustable slide 42 also moves along with it, which can limit the contact range with the blades and achieve the purpose of adjusting the contact depth with the blades according to the thickness of the blades to meet the purpose of uniform distribution, thus ensuring that the falling blades are evenly distributed.

[0055] Furthermore, the valve 38 is fixed to the hopper 33 by a second hinge 54, wherein the second hinge 54 is welded to the upper front end of the hopper 33 and is arranged horizontally; sealing plates 34 are provided on the left and right sides of the valve 38, and each sealing plate 34 is fixed to the hopper 33 by a third screw. By adding the sealing plates 34, the valve 38 can be sealed, reducing dust leakage; a photoelectric bracket 39 is provided on the side of the hopper 33, and the photoelectric bracket 39 is fixed to the side of the hopper 33 by a fourth screw; a photoelectric detector 40 is installed on the photoelectric bracket 39, and the photoelectric detector 40 is connected to a controller. A first circular hole is provided at the lower end of the photoelectric bracket 39, and the photoelectric detector 40 is locked in the first circular hole of the photoelectric bracket 39 by a first nut. The photoelectric detector 40 can be, for example, a... A through-beam phototube; a first cylinder 37 is provided at the front end of the valve 38, the first cylinder 37 is connected to the controller, one end of the first cylinder 37 is connected to a piston rod 57, and the other end of the first cylinder 37 is fixed to a base 35, the base 35 is located at the lower part of the fixing frame, and the base 35 is fixed to the fixing frame by a fifth screw; a second round hole is provided at the corresponding position on both sides of the connection between the first cylinder 37 and the base 35, and a first through pin 36 is provided in the second round hole of the first cylinder 37 and the base 35, the upper end of the first through pin 36 is locked to the base 35 and the first cylinder 37 by a first locking piece; wherein, the controller is a programmable logic controller (PLC), in one embodiment of the present invention, the PLC model is S7-300, it should be noted that the present invention does not specifically limit the type and model of the controller. When the photoelectric detector 40 detects that a blade is obstructing the material flow, it sends a signal to the PLC. The PLC then instructs the first cylinder 37, which pushes the piston rod 57 into the cavity. The piston rod 57 is connected to the fixed seat 55 on the valve 38 via the pin 56, opening the valve 38 and instantly increasing the space for the blade within the hopper 33. When the photoelectric detector 40 does not detect any material obstruction, it sends a signal to the PLC, which in turn instructs the first cylinder 37 to move the piston rod 57 forward, closing the valve 38. Therefore, the photoelectric detector 40, the controller, and the first cylinder 37 work together to prevent the blade from blocking the material in the hopper 33 and causing the machine to stop.

[0056] Furthermore, a fixing seat 55 is provided on the end face of the valve 38. The fixing seat 55 is fixed to the end face of the valve 38 by a sixth screw. A U-shaped groove is provided in the middle of the fixing seat 55. The piston rod 57 is located in the U-shaped groove of the fixing seat 55 and is connected to the fixing seat 55 by a second through pin 56. A third round hole is provided at the corresponding position of the fixing seat 55 and the piston rod 57. The second through pin 56 is located in the third round hole of the fixing seat 55 and the piston rod 57, and the second through pin 56 is used to lock the fixing seat 55 and the piston rod 57 together by a second locking piece.

[0057] Furthermore, there are four material distribution nails 51, arranged at equal intervals in a staggered pattern. Each material distribution nail 51 is arc-shaped, with its arc surface facing the direction of blade movement. A lead screw is provided at the tail end of each material distribution nail 51. A second nut 52 is provided at the bottom of the first groove 49 at a position corresponding to the lead screw of each material distribution nail 51. Each lead screw is screwed onto the first groove 49 after engaging with the corresponding second nut 52. By engaging the second nut 52, the height of the material distribution nail 51 in the first groove 49 can be adjusted. In specific implementation, the height of the material distribution nail 51 is adjusted according to the accumulation of blades on the first groove 49. If the blades are too thick, the material distribution nail 51 is raised slightly to effectively intercept them; if the blades are too thin, the material distribution nail 51 is lowered slightly.

[0058] Furthermore, the feeder 53 is composed of multiple steel bars arranged parallel to each other along the direction of blade advance. The number of steel bars is 6-10, for example, 8. The diameter of each steel bar is 1.5mm-2.5mm, for example, 2mm. The material of each steel bar is stainless steel. The spacing between adjacent steel bars is 40mm-50mm, for example, 45mm. One end of each steel bar is bent at 45° and uniformly welded to the upper part of the first groove 49 along the width direction of the first groove 49.

[0059] Furthermore, the tunnel rehumidifier feed hood 58 of the anti-sticking device for the tunnel rehumidifier is located on the upper part of the tunnel rehumidifier 87 and is bolted to the frame of the tunnel rehumidifier 87; the tunnel rehumidifier discharge hood 63 is located at the discharge end of the tunnel rehumidifier 87 and is bolted to the frame of the tunnel rehumidifier 87; the heat exchanger 76 is located on the ground and outside the tunnel rehumidifier discharge hood 63.

[0060] Furthermore, the first exhaust damper 59 is located above the tunnel rehumidifier feed hood 58 and inside the first exhaust pipe 60, and is fixed to both ends of the first exhaust pipe 60 by a long shaft; the first exhaust pipe 60 is located above the tunnel rehumidifier feed hood 58 and is connected to the flange of the tunnel rehumidifier feed hood 58; the second exhaust pipe 64 is located above the tunnel rehumidifier discharge hood 63 and is connected to the flange of the tunnel rehumidifier discharge hood 63; the second exhaust damper 65 is located above the tunnel rehumidifier discharge hood 63 and inside the second exhaust pipe 64, and is fixed to both ends of the second exhaust pipe 64 by a long shaft, in specific... In practice, the opening of the first row of damp air dampers 59 and the second row of damp air dampers 65 is adjusted by rotating the handle to observe the steam extraction situation in the cavity of the tunnel-type rehumidifier 87. This maintains the pressure balance in the cavity of the tunnel-type rehumidifier 87 and prevents the blades from being sucked away and steam from overflowing. If the opening of the first row of damp air dampers 59 and the second row of damp air dampers 65 is too large, the steam at the inlet and outlet of the tank in the cavity and the blades will be sucked away, thus affecting the expansion effect. Conversely, if the opening of the first row of damp air dampers 59 and the second row of damp air dampers 65 is too small, the steam cannot be discharged from the inlet and outlet of the tank in the cavity, resulting in overflow and affecting the on-site environment.

[0061] Furthermore, such as Figure 6 As shown, the first jet pipe 70 includes a main pipe located outside the discharge hood 63 of the tunnel rehumidifier and having a downwardly bent right-angle structure, and four branch pipes located inside the discharge hood 63 of the tunnel rehumidifier and evenly distributed in the horizontal direction. Each of the branch pipes of the first jet pipe 70 has a plurality of first conical holes evenly distributed vertically downward. The diameter of the first conical hole is 1.5mm-2.5mm, for example, 2mm. Setting the opening of the first jet pipe 70 as a conical hole can increase the spray coverage of the first jet pipe 70.

[0062] Furthermore, such as Figure 5 As shown, the first blowpipe 70 is located above the filter screen 71 and installed in the circular hole of the tunnel rehumidifier discharge hood 63. Specifically, the four branch pipes of the first blowpipe 70 are inserted through the circular hole on one side of the tunnel rehumidifier discharge hood 63 and into the groove on the other side of the tunnel rehumidifier discharge hood 63 to limit and fix the first blowpipe 70. The connection between the four branch pipes of the first blowpipe 70 and the main pipe and the tunnel rehumidifier discharge hood 63 is sealed with felt. It should be noted that the present invention does not specifically limit the number of branch pipes of the first blowpipe 70, the number, distribution, or size of the first conical circular holes on the branch pipes of the first blowpipe 70.

[0063] Furthermore, such as Figure 8As shown, there is one second jet pipe 72, distributed horizontally. Multiple second conical holes are evenly distributed downwards on the second jet pipe 72. The diameter of the second conical holes is 1.5mm-2.5mm, for example, 2mm. Setting the openings of the second jet pipe 72 as conical holes increases the spray coverage area. The angle between the second conical holes and the inner wall of the tunnel rehumidifier discharge hood 63 is 30°-60°, for example, 45°. It should be noted that this invention does not specifically limit the number, distribution, size, or inclination angle of the second conical holes.

[0064] Furthermore, such as Figure 5 As shown, the four branch pipes of the first blow pipe 70 are inserted through the round holes on one side of the tunnel rehumidifier discharge hood 63 and into the grooves on the other side of the tunnel rehumidifier discharge hood 63 to limit and fix the first blow pipe 70. The connection between the four branch pipes of the first blow pipe 70 and the main pipe and the tunnel rehumidifier discharge hood 63 is sealed with felt.

[0065] Furthermore, such as Figure 7 As shown, the filter screen 71 is rectangular in shape, and its surface is evenly distributed with multiple round holes. Reinforcing ribs are welded around the filter screen 71. The connection between the filter screen 71 and the tunnel rehumidifier discharge hood 63 is sealed with a brush. The filter screen 71 is held and fixed by an elongated hole at one end and a groove on the inner side of the tunnel rehumidifier discharge hood 63. Specifically, the filter screen 71 is inserted through the elongated hole on one side of the tunnel rehumidifier discharge hood 63 and into the groove on the other side of the tunnel rehumidifier discharge hood 63 to limit and fix the filter screen 71.

[0066] Furthermore, a solenoid valve 74 is provided on the main pipe of the first spray pipe 70. The solenoid valve 74 is connected to a controller, which controls the solenoid valve 74 to open intermittently. In one embodiment of the present invention, the controller controls the solenoid valve 74 to open intermittently at preset time intervals (e.g., 3-5 seconds), and closes it after a preset spraying time (1-2 seconds), so that the hot air sprayed out has a certain pulse effect. The solenoid valve 74 is threadedly connected to the first spray pipe 70.

[0067] The heat exchanger 76 is connected to the second jet pipe 72 via a hot air duct 82 and a metal hose 81 arranged in sequence. The metal hose 81 is located inside the discharge hood 63 of the tunnel rehumidifier and is used for sealing the joint between the second jet pipe 72 and the hot air duct 82. The joint between the metal hose 81 and the second jet pipe 72 is sealed by a first locking nut 80 located inside the discharge hood 63 of the tunnel rehumidifier. The metal hose 81 moves with the second jet pipe 72 and is threadedly sealed with the second jet pipe 72 to send hot air into the pipe of the second jet pipe 72, so that the hot air comes into contact with the inner wall of the discharge hood 63 of the tunnel rehumidifier and quickly dries the steam condensate on the inner wall of the discharge hood 63 of the tunnel rehumidifier, reducing the adhesion of blades and smoke to the inner wall.

[0068] A hot air fan 83 is provided between the hot air duct 82 and the heat exchanger 76. The heat exchanger 76 and the hot air fan 83 are connected to a controller. The hot air fan 83 is located at the outlet of the heat exchanger 76 and is connected to the flange of the heat exchanger 76. The hot air duct 82 is also connected to the first spray pipe 70. The hot air duct 82 is located at the outlet of the hot air fan 83. A first electric damper 77 is provided on the hot air duct 82. The first electric damper 77 is connected to the controller. The hot air duct 82 is connected to the first spray pipe 70 through a first flange 75. A second electric damper 91 is provided inside the hot air duct 82. The second electric damper 91 is connected to the flange of the hot air duct 82 and is connected to the controller. The controller can adjust the opening of the second electric damper 91, thereby adjusting the spray volume of the second spray pipe 72. Specifically, the hot air duct 82 includes a main hot air duct and an outlet duct that are interconnected. The main hot air duct consists of a U-shaped structure with the opening facing downwards and a U-shaped structure with the opening facing upwards. The outlet duct is located on the U-shaped structure of the main hot air duct, and the first electric damper 77 is located on the outlet duct. The outlet duct and the first jet pipe 70 are connected by the first flange 75, and the first flange 75 is connected to the first jet pipe 70 and the hot air duct 82 by bolts. A second flange and a third flange are installed on the hot air duct 82 for easy maintenance and installation. The first electric damper 77 is located on a branch duct at the outlet end of the hot air duct 82, and the first electric damper 77 is connected to the first jet pipe 70 and the flange of the hot air duct 82. At the start of production, the hot air fan 83 is controlled to run by the controller; after production ends, the hot air fan 83 is stopped by the controller, and the first electric damper 77 and the second electric damper 91 automatically close.

[0069] Furthermore, a steam coil 84 is installed inside the heat exchanger 76, and the steam coil 84 is clamped by a fixing frame inside the heat exchanger 76. Cold air can be drawn in by the hot air fan 83 and exchange heat with the steam coil 84 through the heat exchanger 76 to form hot air; an anemometer 88 is installed inside the second exhaust pipe 64, and the anemometer 88 is connected to the flange of the second exhaust pipe 64. The anemometer 88 is connected to a controller, which is used to control the opening degree of the first electric damper 77 according to the detection result of the anemometer 88. In one embodiment of the present invention, if the anemometer 88 detects that the wind speed inside the second dehumidification pipe 64 reaches a preset threshold (e.g., 10 m / s), it indicates that the air permeability of the filter screen 71 is good, and the PLC does not need to adjust the opening of the first electric damper 77; if the anemometer 88 detects that the negative pressure gas inside the second dehumidification pipe 64 is lower than the preset threshold (e.g., 10 m / s), it indicates that the filter screen 71 is blocked. At this time, the PLC sends an increase command to the first electric damper 77 to increase the opening of the first electric damper 77, so as to ensure that the blowing air volume of the filter screen 71 reaches the best effect. If the air volume is too large, it will conflict with the steam discharged from the tunnel rehumidifier discharge hood 63, and if the air volume is too small, the blowing of the filter screen 71 mesh will not be thorough.

[0070] Furthermore, the tunnel-type rehumidifier 87 is equipped with a second trough 142 that slopes downwards from the inlet to the outlet. The tunnel rehumidifier outlet hood 63 contains two rodless cylinders 79, respectively located at both ends of the second spray pipe 72, used to drive the second spray pipe 72 up and down. Each rodless cylinder 79 is bolted to the inner wall of the tunnel rehumidifier outlet hood 63 and connected to a controller. In one embodiment, the PLC sends a working command to the rodless cylinder 79 to drive it to move up and down, thereby causing the second spray pipe 72 to spray at a preset tilt angle (30°-60°) onto the inner wall of the tunnel rehumidifier outlet hood 63. Each rodless cylinder 79 has a slider on its upper part. The two ends of the second blow pipe 72 are respectively fixed to the upper part of the slider of each rodless cylinder 79 by fixing clips 78. Therefore, the second blow pipe 72 is located inside the discharge hood 63 of the tunnel rehumidifier and is locked on the slider of the rodless cylinder 79 by fixing clips 78. The fixing clips 78 are connected to the slider of the rodless cylinder 79 by screws.

[0071] Furthermore, the upper part of the tunnel-type rehumidifier 87 is provided with an upper cover plate 61, which is hinged to the tunnel-type rehumidifier 87. After the daily production task is completed, the upper cover plate 61 is opened to clean the vibrating conveyor inside the tunnel-type rehumidifier 87. The side of the tunnel-type rehumidifier 87 is provided with an inspection door 62, which is hinged to the tunnel-type rehumidifier 87. By opening the inspection door 62, the transmission mechanism at the lower part of the vibrating conveyor and the steam pipeline valve control system installed inside the tunnel-type rehumidifier 87 can be routinely maintained. Below the tunnel-type rehumidifier 87, a third support 86 is provided for supporting the tunnel-type rehumidifier 87 or the outlet vibrating trough 85. The third support 86 is located on the ground, and the tunnel-type rehumidifier 87 is located on the upper part of the ground and is bolted to the third support 86. The outlet vibrating trough 85 is located below the discharge hood 63 of the tunnel-type rehumidifier and is bolted to the third support 86. The inner and outer sides of the inner wall of the discharge hood 63 of the tunnel-type rehumidifier are provided with first sealing brushes 73, wherein the first sealing brushes 73 are screwed to the discharge hood 63 of the tunnel-type rehumidifier.

[0072] Furthermore, the starting end of the first drainage pipe 60 is a downward-curved arc structure, and the end of the first drainage pipe 60 is an upward-curved elbow structure. The end of the elbow structure is connected to the second drainage fan 141. A condensate drain pipe 68 is provided below the elbow structure, and the condensate drain pipe 68 is welded to the first drainage pipe 60 as a whole. A water collection box 69 is provided below the condensate drain pipe 68, and a drain hose is connected to the water collection box 69. The steam condensate formed by the first drainage pipe 60 and the second drainage pipe 64 is collected and discharged into the water collection box 69 through the condensate drain pipe 68, and then discharged into the ditch through the drain hose below the water collection box 69.

[0073] Furthermore, a fixing ear 67 is provided on the inner edge of the top of the water receiving box 69. For example, the fixing ear 67 is welded to the edge of the water receiving box 69. The fixing ear is fixed to the surface of the first drainage pipe 60 by fixing screws 66. The fixing ear 67 is located at the lower part of the first drainage pipe 60 and is welded to the water receiving box 69 as a whole. The fixing screws 66 are located at the lower part of the first drainage pipe 60 and are screwed to the fixing ear 67.

[0074] Furthermore, the discharge hood 122 of the thin sheet drying machine's moisture control device is flange-connected to the roller 123, and the roller 123 is driven to rotate via a reducer chain drive. For example... Figure 9As shown, the dehumidifying screen 121 is installed inside the discharge hood 122 of the filament drying machine to draw in and filter the moisture generated during the filament drying process inside the drum 123. A first fixing frame 108 is provided on the upper part of the rectangular pipe 137 opposite to the electric converter 112. The drum 123 is supported for rotation by a fourth bracket 124. The first fixing frame 108 is welded to the rectangular pipe 137. A second fixing frame 146 is provided above the outlet pipe of the dehumidifying screen 121, and a second cylinder 107 is located above the second fixing frame 146. The second cylinder 107 is fixed to the second fixing frame 146 by bolts.

[0075] Furthermore, such as Figure 9 As shown, the left end of the telescopic scale 111 is mounted on the electric converter 112, and the right end is mounted on the top of the lead screw 110. Serving as the actuator of the electric converter 112, it is used to detect the rotational operation of the lead screw 110 in real time. Specifically, it detects the engagement of the internal thread of the worm gear 102 with the lead screw 110, which in turn moves the rectangular adjusting plate 117 up and down within the rectangular pipe 137. The electric converter 112 serves as the signal power source for the telescopic scale 111. The rectangular pipe 137 provides space for the convenient installation of the rectangular adjusting plate 117.

[0076] Furthermore, the roller 123 is mounted on the fourth support 124 located on the ground. The inner ring of the worm gear 102 is threaded and screws into the lead screw 110. The outer thread of the worm gear 102 meshes with the worm 103. The worm 103 and the worm shaft 105 are separate components connected by a key. The swing arm 104 is located in the square hole on the end face of the worm shaft 105. The square hole of the swing arm 104 is connected to the worm shaft 105 by a key. The piston rod of the second cylinder 107 is connected to the round hole of the swing arm 104 by a pin and a locking plate. During operation, the second cylinder 107 is driven by compressed air to pull the swing arm 104 to swing at a certain angle, thereby driving the worm gear 102 to rotate. The first fixing frame 108 is welded to the rectangular pipe 137 as a whole; the openings at both ends of the tension spring 106 are connected to the lower hole of the swing arm 104 and the round hole of the first fixing frame 108 to prevent external factors from interfering with the transmission.

[0077] Furthermore, a second fixing frame 146 is provided above the outlet pipe of the desiccation and deflection screen 121. The second cylinder 107 is located above the second fixing frame 146. The second cylinder 107 and the second fixing frame 146 are fixed by bolts. The piston rod of the second cylinder 107 is connected to the round hole of the swing arm 104 by a pin and a locking plate. The second cylinder 107 has an arc-shaped hole 139 on the edge near the swing arm 104. The position of the swing arm 104 in the arc-shaped hole 139 is adjustable. After the position of the swing arm 104 is adjusted, it is fixed by the second locking nut 138.

[0078] Furthermore, a second protective cover 100 is provided on the upper part of the rectangular pipe 137, and the second protective cover 100 is connected to the rectangular pipe 137 by screws; plexiglass plates 101 are provided on both sides of the second protective cover 100, and the plexiglass plates 101 are connected to the second protective cover 100 by screws; the worm gear 102, the worm 103, the swing arm 104, the worm shaft 105, the tension spring 106, the first fixing frame 108, and the lead screw 110 are located inside the second protective cover 100, and one end of the worm shaft 105 is fixed to the second protective cover 100 by a bearing seat. The adjustment mechanism and transmission mechanism of the rectangular adjusting plate 117 are sealed in the cover body by the second protective cover 100. The plexiglass plates 101 on both sides are fixed to the steel plate frame by screws for easy observation of its status during operation, and the other two sides are fixed by steel plates. An elongated hole is provided on one side (e.g., the left side) of the second protective cover 100 for raising and lowering the telescopic ruler 111.

[0079] Furthermore, a desiccant motor 92 is provided on one side of the first desiccant fan 93 to drive the first desiccant fan 93 to rotate, and the desiccant motor 92 is coaxially connected to the first desiccant fan 93, such as... Figure 9 As shown, the dehumidification motor 92 is located to the left of the first dehumidification fan 93; the first negative pressure pipe 94 is connected to the inlet of the first dehumidification fan 93 and the outlet of the dehumidification box 96 via a second flange 95, and the dehumidification box 96 is bolted to the first negative pressure pipe 94 via the second flange 95; both ends of the rectangular pipe 137 are connected to the second negative pressure pipe 97 and the outlet pipe of the dehumidification rotating screen 121 via third flanges 109, and the third flange 109 is bolted to the second negative pressure pipe 97, as shown. Figure 9 As shown, the diameter of the second negative pressure pipe 97 is larger than the diameter of the first negative pressure pipe 94; as Figure 10 As shown, the third flange 109 has several flange holes 140 around its perimeter, and the second negative pressure pipe 97 is connected to the rectangular pipe 137 by bolts passing through the flange holes 140.

[0080] Furthermore, U-shaped graphite grooves 118 are provided on the inner walls of both sides of the rectangular pipe 137, and the rectangular adjusting plate 117 can slide in the U-shaped graphite grooves 118. The inner wall of the U-shaped graphite grooves 118 is made of graphite strips. The U-shaped graphite grooves 118 facilitate the up-and-down adjustment of the rectangular adjusting plate 117 and limit the swing of the rectangular adjusting plate 117. The dehumidification rotating screen 121 and the discharge cover 122 of the drying machine are fixed by bearing seats. The second negative pressure pipe 97 is sealed to the dehumidification box 96 through a flange located inside the second negative pressure pipe 97. The rectangular adjusting plate 117 is installed inside the rectangular pipe 137, and the moisture-expelling regulating damper is the rectangular adjusting plate 117. In specific implementation, the rectangular adjusting plate 117 is inserted into the U-shaped graphite groove 118, which enables the rectangular adjusting plate 117 to move up and down, adjusting the amount of moisture passing through the moisture-expelling rotating screen 121 in the suction roller 123, thereby controlling the outlet moisture of the wire dryer. A rotary joint 145 for providing steam and discharging condensate is provided at the middle position of the outer side of the wire dryer discharge hood 122.

[0081] Furthermore, a U-shaped groove 135 is provided on the upper part of the rectangular adjusting plate 117. A copper sleeve 128 is provided in the inner hole of the rectangular adjusting plate 117 and the U-shaped groove 135, and the copper sleeve 128 is interference-fitted with the inner hole of the rectangular adjusting plate 117 and the U-shaped groove 135. A light axis screw 136 is provided in the circular hole of the U-shaped groove 135 and the copper sleeve 128, and the light axis screw 136 is interference-fitted with the U-shaped groove 135 and the copper sleeve 128 respectively. This can improve operational stability, reduce friction during movement, extend service life, and facilitate disassembly and maintenance. A circular hole is provided on the rectangular adjusting plate 117 for the light axis screw 136 to pass through, such as... Figure 9As shown in the enlarged view of part C, a copper sleeve 128 is fitted into the central circular hole of the rectangular adjusting plate 117. A copper sleeve 128 is also fitted into the circular hole of the U-shaped groove 135 and is coaxial with the circular hole of the rectangular adjusting plate 117. A special-shaped nut 130 and an external threaded rod 98 are provided on the outer side of the U-shaped groove 135, and the special-shaped nut 130 and the external threaded rod 98 are locked by threaded engagement. A cotter pin 131 is provided in the groove of the special-shaped nut 130. The cotter pin 131 passes through the circular hole of the external threaded rod 98 and locks with the groove opening. The special-shaped nut 130 has six non-through grooves evenly divided in the circumference. The cotter pin 131 passes through the circular hole left by the external threaded rod 98 and locks with the groove opening of the special-shaped nut 130. One end of the optical axis screw 136 is an external threaded screw 98. By engaging with the special-shaped nut 130, the U-shaped groove 135 is locked to the rectangular adjusting plate 117. In the specific implementation, after the special-shaped nut 130 is locked in place, the cotter pin 131 passes through the groove of the special-shaped nut 130 and the circular hole in the same direction as the external threaded screw 98 in sequence to fix it and prevent the special-shaped nut 130 from loosening.

[0082] Furthermore, a butterfly spring 99 is provided on the optical axis of the optical axis screw 136 at the slotted position of the U-shaped groove 135, and the inner ring of the butterfly spring 99 is located on the optical axis of the optical axis screw 136 to tension the distance between the U-shaped groove 135 and the rectangular adjusting plate 117. Figure 9 As shown in the enlarged view of part C, the optical axis screw 136 passes through the U-shaped groove 135, the rectangular adjusting plate 117, the circular hole of the copper sleeve 128, and the inner ring of the butterfly spring 99. The gap between the U-shaped groove 135 and the rectangular adjusting plate 117 is compensated by the butterfly spring 99. The contact positions between the inner sides of both ends of the U-shaped groove 135 and the rectangular adjusting plate 117 are limited by the butterfly spring 99 installed on the optical axis screw 136, which can prevent the rectangular adjusting plate 117 from swaying in the left and right directions during lifting or lowering, causing jamming, and also prevent hard friction between the rectangular adjusting plate 117 and the U-shaped groove 135.

[0083] Furthermore, a sealing chamber 115 is provided on the upper part of the U-shaped groove 135, and the sealing chamber 115 is machined integrally with the U-shaped groove 135; an optical axis 132 is provided vertically inside the sealing chamber 115, the optical axis 132 is located below the lead screw 110 and is machined integrally with the lead screw 110, and the optical axis 132 is screwed into the thread in the inner hole of the worm gear 102. A pair of rolling bearings 116 spaced vertically on the optical shaft 132, with the rolling bearings 116 and the optical shaft 132 having an interference fit. The sealing chamber 115 at the top of the U-shaped groove 135 provides an installation position for the rolling bearings 116, which is equivalent to a bearing seat, and also serves as a dustproof, sealing, and lubricating unit. A spacer 129 is fitted on the optical shaft 132 between the two rolling bearings 116, with the spacer 129 having a clearance fit with the optical shaft 132. The spacer 129 separates the pair of rolling bearings 116 to reduce the frictional resistance generated between the inner rings of the two bearings during the rotation of the optical shaft 132. The holes of the rolling bearings 116 and the spacer 129 are inside the sealing chamber 115 and have an interference fit with the optical shaft 132. A retaining ring 133 is provided below the rolling bearing 116 below. A retaining ring groove is provided on the lower side wall of the optical shaft 132. The retaining ring 133 is located in the retaining ring groove to limit the axial movement of the optical shaft 132 and prevent the optical shaft 132 from separating from the bearing during the rising process. It also serves to pull the U-shaped groove 135 during the rotation process. Two thrust ball bearings 134 are arranged horizontally below the optical shaft 132. The thrust ball bearings 134 roll and rub against the optical shaft 132. The lower end face of the optical shaft 132 acts on the rolling elements of the thrust ball bearings 134 to reduce the bottom frictional resistance when the optical shaft 132 rotates, thereby realizing the rapid lifting and lowering of the U-shaped groove 135, and thus automatically adjusting the opening of the rectangular adjusting plate 117.

[0084] Furthermore, a split cover 114 is provided on the upper part of the sealing chamber 115. Screws 113 are provided on both sides of the optical axis 132 on the upper part of the split cover 114. The screws 113 are threadedly connected to the sealing chamber 115 so as to seal the split cover 114 to the sealing chamber 115. The split cover 114 can play a dustproof sealing role and is locked by the screws 113. The interface between the rectangular adjusting plate 117 and the rectangular pipe 137 is sealed by a second sealing brush 119 to prevent moisture from escaping from the rectangular pipe 137. The second sealing brush 119 has a grooved bracket, and an adjusting screw 120 is provided on the upper part of the rectangular pipe 137. The adjusting screw 120 engages with the internal threaded hole of the grooved bracket of the second sealing brush 119, and the grooved bracket provides an installation position for the second sealing brush 119. The electric converter 112 and the second cylinder 107 are connected to the controller. In some embodiments of the present invention, the controller is also connected to the dehumidification motor 92.

[0085] The leaf drying outlet moisture control system provided in this invention achieves uniform distribution and timely loosening. As the vibrating conveyor reciprocates, the leaf fibers in the trough experience uneven distribution and moisture fluctuations due to clumping and interruptions. This is achieved through a material distribution device with material distribution plates, nails, and distributors installed on the electronic weighing device at the leaf fiber drop position. This solves the problem of discontinuous supply during the falling of piled leaf fibers, leading to uneven absorption of steam heat and insufficient moisture expansion, resulting in substandard filling values ​​after drying. Furthermore, the system rapidly dries the steam condensate on the inner wall of the discharge hood using a moisture-removing filter screen and a spray device installed on the inner wall of the discharge hood, reducing the adhesion of leaf fibers and smoke dust to the inner wall. This also prevents the filter screen from clogging and affecting the smooth flow of the moisture removal system, reducing steam overflow. This successfully solves the long-standing problem of filter screen clogging caused by leaf fibers and smoke dust carried by steam during the discharge process in tunnel rehumidifiers, thus reducing the impact on the moisture removal system. Steam overflow ensures a clean and tidy work environment; it also solves the problem of steam condensing on the inner wall of the discharge hood due to the temperature difference between the inside and outside, causing it to adhere to the blades and fall off, thus reducing the flow of defective products into the next process; the high integration of electrical and mechanical systems serves as the power source for the rectangular regulating plate, and adds the function of damper on / off detection and feedback. The actuator has been changed from a circular flap to a rectangular regulating plate, ensuring more precise on / off control within the rectangular pipe, allowing for timely and accurate discharge of moisture from the drying machine drum, thereby ensuring stable moisture content at the drying machine outlet. This successfully solves the problem of the negative pressure state in the dehumidification pipe during the drying machine production process, which affects the control accuracy of the dehumidification damper, ensuring timely and accurate discharge of moisture from the drying machine drum, thus ensuring stable moisture content at the drying machine outlet; it improves the post-drying moisture content deviation and pass rate, while significantly improving the product quality of blade elasticity, curl, and filling value, reducing the labor intensity of operators frequently intervening and adjusting moisture control.

[0086] Correspondingly, such as Figure 11 As shown, the leaf filament drying outlet moisture control method provided in this embodiment specifically includes the following steps in actual implementation:

[0087] Step S1: After being cut, the leaf filaments enter the limiting tube 31 of the equalization device at the leaf filament electronic scale. When the leaf filaments reach the preset thickness, they follow the running direction of the electronic scale belt 45 into the discharge hopper 33. After the pile of leaf filaments enters the discharge hopper 33, they are loosened and evenly distributed in different ways by the equalization plate 41, equalization nail 51 and distributor 53. Under the action of the distributor 53, they slide down into the leaf filament tunnel type rehumidifier 87 of the leaf filament tunnel type rehumidifier dehumidification hood anti-sticking device.

[0088] In one embodiment of the leaf filament drying outlet moisture control system and method of the present invention, step S1 may specifically include:

[0089] Step S11: After being cut, the leaf filaments fall onto the electronic scale belt 45 via the limiting tube 31 above the belt. When the photoelectric detection device on the upper part of the limiting tube 31 is blocked by the material, the blocking signal is transmitted to the electronic scale belt 45, triggering the electronic scale belt 45 to start running.

[0090] Step S12: The blade follows the electronic scale belt 45 to the metering area below the electronic scale belt 45. After receiving the weight signal from the weighing sensor and the speed signal from the speed measuring mechanism in the metering area, the controller calculates to make the instantaneous flow rate of the material reach the process requirements.

[0091] The process requirement for the instantaneous flow rate of the material is to reach a set value of 5000 kg / h. To meet the flow stability requirements, the blade thickness on the electronic scale belt 45 must be 280 mm-320 mm, for example, 300 mm, and the speed of the electronic scale belt 45 must be limited to 0.42 m / s-0.46 m / s, for example, 0.44 m / s.

[0092] Step S13: When the blades of a certain thickness are detached from the electronic weighing belt 45, they pile up and fall into the upper part of the triangular material distribution plate 41 in the hopper 33 for effective loosening. The loosened blades slide down onto the inclined surface of the adjustable slide plate 42 and enter the first trough 49. At this time, according to the thickness of the blades falling into the hopper 33, the adjusting screw 43 is engaged with the adjusting nut 47 on the back of the hopper 44 by rotating the handle 46, and the adjustable slide plate 42 is moved back and forth to change the contact area between the material distribution plate 41 and the blades.

[0093] When the photoelectric detectors 40 installed on both sides of the discharge hopper 33 are blocked, the blocking signal is transmitted to the controller. The controller then opens the two-position five-way valve of the air source control system of the first cylinder 37. The valve 38 is then quickly opened by the retraction of the piston rod installed inside the first cylinder 37 to prevent material blockage in the discharge hopper 33 and maintain production continuity. When the photoelectric detectors 40 installed on both sides of the discharge hopper 33 are transparent, the controller reverses the two-position five-way valve of the air source control system of the first cylinder 37. The first cylinder 37 drives the internal piston rod to close the valve 38, returning it to the initial position.

[0094] Step S14: When the blade slides from the adjustable slide plate 42 to the first trough 49 and is conveyed forward to a preset distance from the point where the blade falls into the trough 49, it is intercepted and impacted by multiple staggered and evenly distributed material distribution nails 51 installed along the width direction of the trough 49.

[0095] The preset distance is 180mm-220mm, for example, 200mm. Some of the blade strands sliding from the adjustable slide 42 into the first trough 49 are still clumped together and cannot be separated. Power is transmitted from the motor at the bottom of the first trough 49 to the eccentric connecting rod assembly at the bottom of the first trough 49, causing the trough 49 to reciprocate and transport the blade strands forward. After loosening, the remaining clumped blade strands are further loosened by the impact of the material distribution nails 51 during the reciprocating motion of the first trough 49.

[0096] Step S15: The blades continue to be conveyed forward through the reciprocating motion of the first trough 49 to the upper part of multiple equalizers 53 evenly installed at the discharge end of the first trough 49, so that the loosened blades are evenly distributed so that the amount of blades between adjacent equalizers 53 is equal and there is a gap for even distribution.

[0097] After being loosened by the equalizing plate 41 and equalizing nails 51, the blade filaments are conveyed forward through the first trough 49 via reciprocating motion to the upper part of the eight evenly installed equalizing devices 53 at the discharge end of the first trough 49. The distributor 53 then evenly distributes the gaps between the loosened blade filaments before they fall into the second trough 142 of the tunnel-type rehumidifier 87 for expansion. These steps improve the loosening effect of the blade filaments.

[0098] Step S2: After cutting, the blade filaments enter the second tank 142 of the tunnel rehumidifier 87 through the feed hood 58. They come into contact with high-temperature, high-humidity steam, causing the blade filaments to expand rapidly. Excess steam and smoke are discharged outdoors through the first exhaust pipe 60 and the second exhaust pipe 64. The pressure balance within the chamber is maintained by adjusting the opening of the first exhaust damper 59 and the second exhaust damper 65. The rapidly expanding blade filaments fall into the discharge hood 63 of the tunnel rehumidifier as the tank 49 reciprocates. The air enters the dehumidification control device of the thin plate drying machine above the outlet trough 85; at the same time, hot air is generated through the heat exchanger 76. The hot air is divided into two paths. One path enters the first spray pipe 70 and sprays the filter screen 71; the other path enters the second spray pipe 72. During the up and down movement of the second spray pipe 72, the entire inner wall of the tunnel rehumidifier discharge hood 63 is sprayed, which quickly dries the steam condensate on the inner wall of the tunnel rehumidifier discharge hood 63 and reduces the adhesion of leaf filaments and smoke to the inner wall.

[0099] In one embodiment of the leaf filament drying outlet moisture control system and method of the present invention, step S2 may specifically include:

[0100] Step S21: The blades (with a moisture content of 18%-20%) are continuously conveyed from the first tank 49 into the tunnel-type rehumidifier 87 for expansion treatment.

[0101] The blades move with the second tank 142 inside the tunnel-type rehumidifier 87. When the blades reach the working channel of the second tank 142, high-temperature steam is ejected through small holes on the bottom plate of the working channel and forms a vortex layer, which blows the blades into a semi-suspended state to expand the heat exchange area of ​​the blades. The steam condenses evenly on the surface of the blades, the blades rapidly increase in temperature, and the moisture penetrates evenly, causing the blades to expand to a moisture content of 22%-25% and a temperature ≥65℃.

[0102] Step S22: The waste generated during the blade expansion process in the first dehumidification pipe 60 and the second dehumidification pipe 64, which are connected between the inlet hood 58 and the outlet hood 63 of the tunnel rehumidifier, is sucked up by the second dehumidification fan 141.

[0103] The second exhaust fan 141 operates to remove excess exhaust gas generated by the expanded blades. In practice, the intake volume through the first exhaust fan 59 and the second exhaust fan 65 can be adjusted according to the actual situation to maintain the pressure balance inside the tunnel-type rehumidifier 87.

[0104] In step S23, steam enters the steam coil 84 of the heat exchanger 76 through the rotary joint 145, and at the same time, the hot air temperature is maintained within the preset temperature range by the hot air fan 83.

[0105] The hot air blower 83 operates at a speed of 18Hz-22Hz (e.g., 20Hz), with the wind speed controlled between 9.5m / s and 10.5m / s (e.g., 10m / s). The temperature of the hot air inside the hot air duct 82 is monitored in real time by a temperature sensor installed on the side of the hot air duct 82 and kept within the range of 115℃-125℃.

[0106] In step S24, the hot air generated by the hot air blower 83 enters the first blow pipe 70 through the first electric damper 77 with an opening of 100%. The solenoid valve 74 is controlled to open intermittently (for example, stop for 30 seconds and then open for 3 seconds) to intermittently blow the leaf filaments and soot adhering to the multiple air-permeable round holes of the filter screen 71 to achieve a pulse effect.

[0107] Excessive airflow in the second exhaust duct 64 will conflict with the steam discharged from the tunnel rehumidifier's outlet hood 63, while insufficient airflow will result in incomplete blowing of the filter screen 71. In practice, when the controller detects a wind speed of 10 m / s measured by the anemometer 88 installed inside the second exhaust duct 64, it indicates good air permeability of the filter screen 71. When the anemometer 88 detects a negative pressure gas velocity below 10 m / s inside the second exhaust duct 64, it indicates that the filter screen 71 is clogged. In this case, the pause time of the solenoid valve 74 should be reduced, and the frequency of blowing the filter screen 71 through the first blowpipe 70 should be increased to ensure optimal airflow to the filter screen 71.

[0108] In step S25, the hot air blower 83 generates a second path of hot air, which is controlled by the second electric damper 91 to control the total opening of the hot air duct 82 to 57%-63% (for example, 60%) and enters the second spray pipe 72 to spray the inner wall of the tunnel rehumidifier discharge hood 63.

[0109] Two sets of rodless cylinders 79 are installed on the inner walls of the left and right sides of the discharge hood 63 of the tunnel rehumidifier. The second spray pipe 72 is installed on the slider of the rodless cylinder 79 by the fixing clamp 78. The PLC drives the rodless cylinders 79 on both sides of the discharge hood 63 of the tunnel rehumidifier to move up and down at preset time intervals (2.5min-3.5min, for example, 3min) according to the set program. This causes a row of multiple trumpet-shaped conical holes with a diameter of 1.8mm-2.2mm, for example, 2mm, which are evenly distributed on the two second spray pipes 72, to be inclined at a 45° angle to the inner wall of the discharge hood 63 of the tunnel rehumidifier and spray onto the inner walls of the left and right sides of the discharge hood 63.

[0110] Step S26: The metal hose 81 moves with the rodless cylinder 79 and is threadedly sealed with the second blow pipe 72, continuously sending hot air into the pipe of the second blow pipe 72. The heated air comes into contact with the inner wall of the tunnel rehumidifier discharge hood 63, quickly drying the steam condensate on the inner wall. At the same time, it blows away the soot adhering to the inner walls on both sides of the tunnel rehumidifier discharge hood 63, keeping the inner wall of the tunnel rehumidifier discharge hood 63 clean.

[0111] Step S27: After the tunnel-type rehumidifier 87 finishes production, open the upper cover plate 61 of the tunnel-type rehumidifier 87 and clean the adhering sludge on the second tank 142 and the upper cover plate 61; at the same time, the inspection door 62 needs to be opened for maintenance before and after shifts to maintain the steam and water control cabinet located at the bottom of the tunnel-type rehumidifier 87.

[0112] Step S3: Before the filaments enter the dehumidification control device of the thin plate drying machine, the drum 123 is preheated. The dehumidification motor 92 drives the first dehumidification fan 93 to rotate, the drum 123 rotates, the hot air fan 83 starts, and the rectangular adjustment plate 117 opens to a preset degree to maintain the gas balance inside the drum 123. When the temperature of the drum 123 reaches the set value, the preheating mode is switched to production mode. The filaments enter the high-temperature drum 123 through the tunnel-type rehumidifier 87 and exchange heat with the drum wall and hot air. The first dehumidification fan 93 rotates to form a negative pressure in the first negative pressure pipe 94 and the second negative pressure pipe 97, and draws the moisture and dust generated by the filaments during the heat exchange process into the dehumidification box 96, and discharges it outdoors through the filter bag. At the same time, according to the comparison result between the outlet moisture setting value and the actual moisture meter detection value, the opening of the rectangular adjustment plate 117 is adjusted to automatically adjust the outlet moisture of the drying machine.

[0113] In one embodiment of the leaf filament drying outlet moisture control system and method of the present invention, step S3 may specifically include:

[0114] Step S31: After the leaf filaments expand through the tunnel-type rehumidifier 87, the moisture content reaches 22%-25%, and they fall into the upper part of the outlet vibrating trough 85. Then they are conveyed to the upper part of the vibrating conveyor 143 and flow through the feed hood 144 of the drying machine from left to right into the thin plate drying machine.

[0115] Specifically, the filaments enter the inclined roller 123 of the thin plate filament drying machine. The transmission device driven by the motor reducer located at the lower end of the roller 123 drives the roller 123 to rotate. The rotation speed of the roller 123 is 10r / min-12r / min, for example, 11r / min.

[0116] Step S32: Heat energy is supplied to the roller 123 by the steam supply entering the discharge hood 122 of the filament drying machine via the rotary joint.

[0117] The controller controls the opening of the pneumatic diaphragm valve located at the bottom of the drum 123 to control the steam supply of the rotary joint 145 on the outer end face of the discharge hood 122 of the filament dryer, and sends the steam into the rotating drum 123 to heat the 12 arc-shaped plates and 12 lifting plates evenly distributed in the circumference of the drum 123, so that their temperature reaches 130℃-140℃. Through the rotation of the drum 123, heat exchange with the filaments is completed in the drum 123 to achieve the purpose of drying. At the same time, the condensate water after heat exchange in the drum 123 is discharged to the outside through the internal ring pipe of the rotary joint 145.

[0118] Step S33: By supplying steam into the heat exchanger, the air is heated to form process hot air, which is sent into the drum 123 from the inlet and outlet of the drum 123 to provide heat energy to the drum 123.

[0119] The opening of the pneumatic diaphragm valve located at the bottom of the drum 123 is adjusted by the controller to control the amount of steam supplied to the heat exchanger 76. The air is heated by the heat exchanger 76 to a temperature of 108℃-112℃ to form process hot air. This hot air is sent into the drum 123 from the inlet and outlet respectively to dry the humid air generated after the high temperature and high humidity blades exchange heat inside the drum 123.

[0120] Step S34: When the filaments pass through the drum 123, they come into direct contact with the heated drum wall and are continuously heated. The internal moisture vaporizes to produce hot and humid air. This air exchanges heat with the hot air entering through the upper part of the filament drying machine feed hood 144 in the drum 123, producing exhaust gas. This exhaust gas is filtered through the dehumidification screen 121 and discharged outside the drum 123 to ensure that the moisture content of the filaments reaches 12.5%-13.5% after drying.

[0121] Step S35: The PID controller calculates the dehydration amount based on the difference between the moisture content of the incoming material and the moisture content at the outlet after drying, and automatically adjusts the opening of the rectangular adjustment plate 117 according to the dehydration amount.

[0122] The opening size of the rectangular adjusting plate 117 determines the exhaust air volume, which changes the relative humidity inside the drying machine. The PLC calculates the difference between the set value of the dried outlet water (SP, 13±0.5)% and the actual value (PV) detected by the moisture meter located at the outlet of the roller 123. Based on this feedback, the PLC automatically inputs the compressed air pressure to the second cylinder 107 through the PID regulating electric converter. This drives the piston rod to pull the swing arm 104, which in turn drives the worm 103 on the outer ring of the worm shaft 105 to mesh with the worm wheel 102. At the same time, the inner thread of the worm wheel 102 engages with the lead screw 110. This adjusts the moving distance of the rectangular adjusting plate 117 (this parameter is fixed during preheating and is adjusted at any time during production) to ensure that the dried outlet moisture content is close to the set value and meets the moisture requirements after drying.

[0123] Step S36: During the leaf drying and dehydration control process, the PID controller outputs parameter values ​​to control the coordinated operation of the cylinder temperature, hot air temperature, and exhaust air volume to ensure stable outlet moisture content after leaf drying.

[0124] Specifically, during the moisture adjustment process, the drum temperature and hot air temperature are generally not adjusted. The control method should prioritize adjusting the exhaust air volume, because the moisture meter is located 1m above the conveyor belt at the front end of the discharge drum 123 after the blades are dried, so it provides the most direct and fastest feedback on moisture content. If the moisture deviation is too large, then the hot air volume and drum temperature should be adjusted to ensure that the outlet moisture content is controlled within the process requirements.

[0125] Step S37: After the day's production tasks are completed, the wire drying machine is cooled down.

[0126] The controller issues a command to close the steam supply valve located on the lower part of the drum 123. With the steam valve supplying steam to the heat exchanger closed, the drum 123 continues to rotate at 6 rpm, maintaining a certain opening degree according to the PID parameter settings. Under the action of the second cylinder 107, the rectangular adjusting plate 117, according to the PID parameter values, inputs compressed air at 3 MPa pressure to the cylinder 107 via an electrical converter. This drives the piston rod to pull the swing arm 104, which in turn drives the outer ring of the worm shaft 105, where the worm 103 meshes with the worm wheel 102. Simultaneously, the inner thread of the worm wheel 102 engages with the lead screw 110, gradually opening the rectangular adjusting plate 117 to 100% opening, rapidly reducing the drum temperature. When the steam return water temperature sensor on the drum wall detects a water temperature of 60°C, it sends a signal back to the controller, prompting the controller to issue a command to stop the drum 123.

[0127] The leaf drying outlet moisture control system and method provided in this invention achieve uniform distribution and timely loosening. As the vibrating conveyor reciprocates, the leaf fibers in the trough experience uneven distribution and moisture fluctuations due to clumping and interruptions. This is achieved through a material distribution device with material distribution plates, nails, and distributors installed in an orderly manner at the leaf fiber electronic weighing drop position. This solves the problem of discontinuous supply during the falling of piled leaf fibers, leading to uneven absorption of steam heat and insufficient moisture expansion, resulting in substandard leaf fiber filling value after drying. Furthermore, the orderly installation of dehumidification filters and a spraying device on the inner wall of the discharge hood rapidly dries the steam condensate on the inner wall of the discharge hood, reducing the adhesion of leaf fibers and dust to the inner wall. Simultaneously, it prevents the filter screen inside the discharge hood from clogging, thus avoiding obstruction of the dehumidification system and reducing steam overflow. This successfully solves the long-standing problem of the filter screen inside the discharge hood of the tunnel rehumidifier becoming clogged with leaf fibers and dust carried by steam during the discharge process, thus reducing the obstruction of the dehumidification system. Minimal steam overflow ensures a clean and tidy work environment; it also solves the problem of steam condensing on the inner wall of the discharge hood due to temperature differences between the inside and outside, causing it to adhere to the blades and fall off, thus reducing the flow of defective products into the next process; the high integration of electrical and mechanical systems serves as the power source for the rectangular regulating plate, and adds damper on / off detection and feedback functions. The actuator has been changed from a circular flap to a rectangular regulating plate, ensuring more precise on / off control within the rectangular pipe, allowing for timely and accurate discharge of moisture from the drying machine drum, thereby ensuring stable moisture content at the drying machine outlet. This successfully solves the problem of negative pressure in the exhaust pipe during the drying machine production process affecting the control accuracy of the exhaust damper, ensuring timely and accurate discharge of moisture from the drying machine drum, thus ensuring stable moisture content at the drying machine outlet; it improves the post-drying moisture content deviation and pass rate, while significantly improving the product quality of blade elasticity, curl, and filling value, reducing the labor intensity of operators frequently intervening and adjusting moisture control.

[0128] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0129] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A leaf filament drying outlet moisture control system, characterized in that, include: The following components are sequentially installed: a material distribution device for the electronic scale used for feeding filaments, a moisture-removing hood and anti-sticking device for the tunnel-type rehumidifier for filaments, and a moisture control device for the thin-plate filament drying machine. The blade electronic scale material distribution device includes: an electronic scale belt for conveying blades, a measuring tube at the top of one end of the electronic scale belt, and a material hopper at the side of the other end of the electronic scale belt; a discharge hopper inside the discharge hopper, an adjustable chute with an adjustable tilt angle above the discharge hopper, a material distribution plate above the adjustable chute, the cross-sectional area of ​​the material distribution plate being smaller than the cross-sectional area of ​​the adjustable chute so that the blades on the material distribution plate can slide onto the adjustable chute; an openable and closable gate at the front end of the discharge hopper; a first trough below the discharge hopper, a plurality of height-adjustable material distribution nails arranged at the upper part of the first trough along the blade forward direction, and a material distributor at the front end of the outlet of the first trough. The anti-sticking device for the leaf-filament tunnel-type rehumidifier includes: a tunnel-type rehumidifier, wherein a second trough inclined downwards from the inlet to the outlet is provided inside the tunnel-type rehumidifier; a tunnel-type rehumidifier inlet hood is provided above the inlet end of the tunnel-type rehumidifier; a tunnel-type rehumidifier outlet hood is provided at the outlet end of the tunnel-type rehumidifier; a first dehumidification pipe is provided above the inlet hood of the tunnel-type rehumidifier; a second dehumidification pipe is provided above the outlet hood of the tunnel-type rehumidifier; the second dehumidification pipe is connected to the first dehumidification pipe; and a first [missing information - likely a type of drainage system] is provided between the inlet hood of the tunnel-type rehumidifier and the first dehumidification pipe. A second desiccation damper is provided between the discharge hood of the tunnel rehumidifier and the second desiccation pipe. Inside the discharge hood of the tunnel rehumidifier, from top to bottom, are arranged a first spray pipe, a filter screen, and a second spray pipe. The first spray pipe is used to spray the filter screen, and the second spray pipe is liftable and used to spray the inner wall of the discharge hood. A heat exchanger is provided outside the discharge hood of the tunnel rehumidifier, connected to the first and second spray pipes, to provide hot air to them. An outlet vibration groove is provided below the discharge hood of the tunnel rehumidifier. The dehumidification control device for the thin-plate drying machine includes: a roller, with a drying machine feed hood at the inlet end and a drying machine discharge hood at the outlet end; a dehumidification rotating screen is installed above the drying machine discharge hood; a first dehumidification fan and a dehumidification box are sequentially installed on the second floor, connected by a first negative pressure pipe; a second negative pressure pipe is installed at the inlet of the dehumidification box; a rectangular pipe is installed between the second negative pressure pipe and the outlet pipe of the dehumidification rotating screen; a sliding rectangular... A rectangular adjusting plate is provided, with a lead screw vertically mounted above it. An electric converter is located on one side of the upper part of the rectangular pipe. A retractable scale is mounted horizontally on the upper part of the electric converter, and the retractable scale is used to detect the vertical movement distance of the lead screw. A worm wheel is located at the top of the lead screw, and a worm shaft is located at the end of the worm wheel. A worm is located outside the worm shaft, and the worm is coaxial with the worm shaft. A swing arm is connected to the worm shaft, and a second cylinder is connected to the top of the swing arm. A tension spring is connected to the lower end of the swing arm. The material distribution device at the electronic scale for the filament falling position is connected to the tunnel-type rehumidifier of the filament tunnel-type rehumidifier through the material distributor; the anti-sticking device of the filament tunnel-type rehumidifier is connected to the feed hood of the drying machine of the thin plate drying machine through a vibrating conveyor that is set below the outlet vibrating groove and inclined upwards.

2. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The material distribution device for the electronic scale also includes a first protective cover, with the electronic scale belt disposed inside the first protective cover and the limiting tube disposed above the first protective cover. A first support is disposed below the first protective cover, located on the ground and connected to the first protective cover by a first bolt. The material hopper is fixed to the first protective cover by a first screw located on the upper part of the first protective cover and screwed into the internal thread of the first protective cover. A second support is disposed below the first trough, with the first trough connected to the frame and the balance body by a rocker arm. The second support is located on the ground and connected to the balance body by a second bolt. The material distribution plate is fixed to the upper part of the adjustable chute by a second screw. The adjustable chute is fixed to the upper part of the feeding hopper by a first hinge. An adjusting screw is disposed on the outer side of the adjustable chute, passing through the feeding hopper and the material drop hopper and extending to the outside of the material drop hopper. A handle is disposed at the end of the adjusting screw. An adjusting nut is disposed on the outer side of the adjusting screw at the connection position with the feeding hopper. The angle between the adjustable chute and the vertical direction is in the range of 30°-75°.

3. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The valve is fixed to the hopper via a second hinge, which is welded to the upper front end of the hopper and is horizontally oriented. Sealing plates are located on both sides of the valve, each fixed to the hopper by a third screw. A photoelectric bracket is mounted on the side of the hopper and fixed to the side by a fourth screw. A photoelectric detector is mounted on the photoelectric bracket and connected to a controller. A first circular hole is located at the lower end of the photoelectric bracket, and the photoelectric detector is locked into the first circular hole by a first nut. A first cylinder is located at the front end of the valve and connected to the controller. One end of the first cylinder is connected to a piston rod, and the other end is fixed to a base located below a mounting frame. The base is fixed to the mounting bracket by a fifth screw; second round holes are respectively provided at corresponding positions on both sides of the connection between the first cylinder and the base, and a first through pin is provided in the second round hole of the first cylinder and the base. The upper end of the first through pin is locked to the base and the first cylinder by a first locking piece; a fixed seat is provided on the end face of the valve, and the fixed seat is fixed to the end face of the valve by a sixth screw. A U-shaped groove is opened in the middle of the fixed seat, and the piston rod is located in the U-shaped groove of the fixed seat and connected to the fixed seat by a second through pin. A third round hole is opened at the corresponding position of the fixed seat and the piston rod, and the second through pin is located in the third round hole of the fixed seat and the piston rod. The second through pin is connected and locked to the fixed seat and the piston rod by a second locking piece.

4. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The material distribution nails are four in number and are distributed at equal intervals in a staggered pattern. Each material distribution nail is arc-shaped, and the arc surface of each material distribution nail faces the direction of blade movement. A lead screw is provided at the tail end of each material distribution nail. A second nut is provided at the bottom of the first groove corresponding to the position of the lead screw of each material distribution nail. Each lead screw is fixed to the first groove after being screwed into the corresponding second nut. The height of the material distribution nail in the first groove can be adjusted by screwing in the second nut. The material distributor is composed of multiple steel bars arranged parallel to the direction of blade movement. The diameter of each steel bar is 1.5mm-2.5mm, the material of each steel bar is stainless steel, the spacing between adjacent steel bars is 40mm-50mm, one end of each steel bar is bent at 45°, and it is uniformly welded to the upper part of the first groove along the width direction of the first groove.

5. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The first jet pipe includes a main pipe located outside the discharge hood of the tunnel rehumidifier and having a downwardly bent right-angle structure, and four branch pipes located inside the discharge hood of the tunnel rehumidifier and evenly distributed horizontally. Each branch pipe of the first jet pipe has a plurality of first conical holes evenly distributed vertically downwards, wherein the diameter of the first conical holes is 1.5mm-2.5mm. The second jet pipe consists of one pipe distributed horizontally, and has a plurality of second conical holes evenly distributed downwards at an angle, the diameter of the second conical holes being 1.5mm-2.5mm, and the angle between the second conical holes and the inner wall of the discharge hood of the tunnel rehumidifier being 30°-60°. The four branch pipes of the first jet pipe discharge material through the tunnel rehumidifier. The first blowpipe is inserted through a round hole on one side of the hood and into a groove on the other side of the tunnel rehumidifier discharge hood to limit and fix it. The four branch pipes of the first blowpipe are sealed with felt at their connections to the main pipe and the tunnel rehumidifier discharge hood. The filter screen is rectangular in shape and has multiple round holes evenly distributed on its surface. Reinforcing ribs are welded around the filter screen. The connection between the filter screen and the tunnel rehumidifier discharge hood is sealed with a brush. The filter screen is inserted through a long hole on one side of the tunnel rehumidifier discharge hood and into a groove on the other side of the tunnel rehumidifier discharge hood to limit and fix it. A solenoid valve is installed on the main pipe of the first blowpipe. The solenoid valve is connected to a controller, which controls the intermittent opening of the solenoid valve.

6. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The heat exchanger is connected to the second jet pipe via a hot air duct and a metal hose arranged sequentially. The metal hose is located inside the discharge hood of the tunnel rehumidifier. The joint between the metal hose and the second jet pipe is sealed with a first locking nut. A hot air fan is installed between the hot air duct and the heat exchanger. The heat exchanger and the hot air fan are connected to a controller. The hot air duct is also connected to the first jet pipe. A first electric damper is installed on the hot air duct and is connected to the controller. The hot air duct is connected to the first jet pipe via a first flange. A steam coil is installed inside the heat exchanger. An anemometer is installed inside the second exhaust duct and is connected to the controller. The controller is used to control the opening of the first electric damper based on the anemometer's detection result. A second electric damper is installed inside the hot air duct and is connected to the controller.

7. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The tunnel-type rehumidifier has a second trough that slopes downwards from the inlet to the outlet. Inside the outlet hood of the tunnel-type rehumidifier are two rodless cylinders, each located at one end of a second jet pipe, used to drive the second jet pipe up and down. Each rodless cylinder is connected to a controller, and a slider is located on the upper part of each rodless cylinder. Both ends of the second jet pipe are fixed to the upper part of the slider of each rodless cylinder by fixing clamps. The tunnel-type rehumidifier has a top cover plate, inspection doors on its sides, and a support structure at the bottom for the tunnel. The tunnel rehumidifier or the third support of the outlet vibrating trough; the inner and outer sides of the inner wall of the discharge hood of the tunnel rehumidifier are provided with first sealing brushes; the starting end of the first dehumidification pipe is a downwardly curved arc structure, and the end of the first dehumidification pipe is an upwardly curved elbow structure. The end of the elbow structure is connected to a second dehumidification fan. A condensate drain pipe is provided below the elbow structure. A water collection box is provided below the condensate drain pipe. The water collection box is connected to a drain hose. A fixing lug is provided on the inner edge of the top of the water collection box. The fixing lug is fixed to the surface of the first dehumidification pipe by fixing screws.

8. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, The roller is mounted on a fourth support located on the ground. The inner ring of the worm gear is threaded and engages with the screw thread. The outer thread of the worm gear meshes with the worm. The worm and the worm shaft are connected by a key. The swing arm is located in the square hole on the end face of the worm shaft, and the square hole of the swing arm is connected to the worm shaft by a key. A first fixing frame is provided on the upper part of the rectangular pipe opposite to the electric converter. The first fixing frame is welded to the rectangular pipe. The two ends of the tension spring are located in the round holes of the swing arm and the first fixing frame, respectively. A second fixing frame is provided above the outlet pipe of the dehumidification and rewinding net. The second cylinder is located above the second fixed frame and is fixed to the second fixed frame by bolts. The piston rod of the second cylinder is connected to the circular hole of the swing arm by a pin and a locking plate. The second cylinder has an arc-shaped hole on its edge near the swing arm, and the position of the swing arm within the arc-shaped hole is adjustable. After the position of the swing arm is adjusted, it is fixed by a second locking nut. A second protective cover is provided on the upper part of the rectangular pipe, and the second protective cover is connected to the rectangular pipe by screws. Acrylic glass plates are provided on both sides of the second protective cover, and the acrylic glass plates are connected to the second protective cover. The protective cover is connected by screws; the worm gear, the worm, the swing arm, the worm shaft, the tension spring, the first fixing frame, and the lead screw are located inside the second protective cover, and one end of the worm shaft is fixed to the second protective cover by a bearing seat; a desiccant motor is provided on one side of the first desiccant fan to drive the first desiccant fan to rotate, and the desiccant motor is coaxially connected to the first desiccant fan; the first negative pressure pipe is connected to the inlet of the first desiccant fan and the outlet of the desiccant collection box through a second flange; both ends of the rectangular pipe are connected to the second negative pressure pipe and the outlet of the desiccant rotating net through a third flange. The pipe is connected to the outlet pipe, and the third flange is bolted to the second negative pressure pipe; the third flange has several flange holes around its perimeter, and the second negative pressure pipe is connected to the rectangular pipe by bolts passing through the flange holes; U-shaped graphite grooves are provided on the inner walls of both sides of the rectangular pipe, and the rectangular adjusting plate can slide in the U-shaped graphite grooves; the dehumidification rotating screen is fixed to the discharge hood of the drying machine by bearing seats; the second negative pressure pipe is sealed to the dehumidification box by a flange located inside the second negative pressure pipe; a rotary joint for providing steam and discharging condensate is provided at the middle position of the outer side of the discharge hood of the drying machine.

9. The leaf filament drying outlet moisture control system according to claim 1, characterized in that, A U-shaped groove is provided on the upper part of the rectangular adjusting plate. A copper sleeve is installed in the inner hole of the rectangular adjusting plate and the U-shaped groove, and the copper sleeve is interference-fitted with the inner hole of the rectangular adjusting plate and the U-shaped groove. A linear screw is installed in the circular hole of the U-shaped groove and the copper sleeve, and the linear screw is interference-fitted with both the U-shaped groove and the copper sleeve. A special-shaped nut and an externally threaded screw are provided on the outer side of the U-shaped groove, and the special-shaped nut and the externally threaded screw are locked together by threaded engagement. A cotter pin is provided in the groove of the special-shaped nut, and the cotter pin passes through the circular hole of the externally threaded screw and locks into the groove opening. A butterfly spring is provided on the optical axis of the linear screw at the slotted position of the U-shaped groove, and the inner ring of the butterfly spring is located at the... On the optical axis of the optical axis screw; a sealing chamber is provided on the upper part of the U-shaped groove, and the sealing chamber and the U-shaped groove are machined together; an optical axis is arranged vertically inside the sealing chamber, the optical axis is located below the lead screw, and is machined together with the lead screw; a pair of rolling bearings are sleeved on the optical axis, spaced apart vertically, and the rolling bearings are interference-fitted with the optical axis; a spacer is sleeved on the optical axis between the two rolling bearings, and the spacer is clearance-fitted with the optical axis; a retaining ring is provided below the lower rolling bearing, and a retaining ring groove is opened on the lower end side wall of the optical axis, and the retaining ring is disposed in the retaining ring groove; two thrust ball bearings are arranged horizontally below the optical axis, and the thrust ball bearings roll and rub against the optical axis; A split-type pressure cover is provided on the upper part of the sealing chamber. Screws are provided on both sides of the optical axis on the upper part of the split-type pressure cover. The screws are threadedly connected to the sealing chamber to seal the split-type pressure cover to the sealing chamber. The interface between the rectangular adjusting plate and the rectangular pipe is sealed by a second sealing brush. The second sealing brush has a grooved support. An adjusting screw is provided on the upper part of the rectangular pipe, and the adjusting screw engages with the internal threaded hole of the grooved support of the second sealing brush. The electric converter and the second cylinder are connected to the controller.

10. A method for controlling the moisture content at the outlet of a leaf drying process using the system described in any one of claims 1-9, characterized in that, Includes the following steps: After being cut, the leaf filaments enter the limiting tube of the equalization device at the leaf filament electronic scale. When the leaf filaments reach the preset thickness, they follow the direction of the electronic scale belt and enter the discharge hopper. After the pile of leaf filaments enters the discharge hopper, they are loosened and evenly distributed in different ways by the equalization plate, equalization nails and distributor. Under the action of the distributor, they slide down into the leaf filament tunnel type rehumidifier dehumidification hood anti-sticking device. After being cut, the leaf filaments enter the second tank of the tunnel rehumidifier through the feed hood. They come into contact with high-temperature, high-humidity steam, causing the filaments to expand rapidly. Excess steam and soot are discharged outdoors through the first and second exhaust pipes. The pressure balance within the chamber is maintained by adjusting the opening of the first and second exhaust dampers. The rapidly expanding filaments fall onto the outlet vibrating trough below the discharge hood of the tunnel rehumidifier as the tank reciprocates, entering the dehumidification control device of the thin-plate drying machine. Simultaneously, hot air is generated through the heat exchanger and splits into two paths. One path enters the first blowpipe to blow air onto the filter screen; the other path enters the second blowpipe, blowing air onto the entire inner wall of the discharge hood of the tunnel rehumidifier as it moves up and down. This rapidly dries the steam condensate on the inner wall of the discharge hood, reducing the adhesion of leaf filaments and soot to the inner wall. Before the filaments enter the dehumidification control device of the thin-plate drying machine, the drum is preheated. The dehumidification motor drives the first dehumidification fan to rotate. As the drum rotates, the hot air fan starts, and the rectangular adjustment plate opens to a preset degree to maintain the gas balance inside the drum. When the temperature of the drum reaches the set value, the machine switches from preheating to production mode. The filaments enter the high-temperature drum through the tunnel-type rehumidifier and exchange heat with the drum wall and hot air. The first dehumidification fan rotates and creates negative pressure in the first and second negative pressure pipes, drawing the moisture and dust generated by the filaments during heat exchange into the dehumidification box, where they are filtered through a cloth bag and discharged outdoors. At the same time, the opening of the rectangular adjustment plate is adjusted according to the comparison between the set outlet moisture value and the actual moisture meter reading to automatically regulate the outlet moisture of the drying machine.

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