Method for controlling moisture exhaust air door of a sheet drying machine

Abstract

The application discloses a kind of thin plate cut tobacco machine exhaust air door control method, comprising: preheating the drum of thin plate cut tobacco machine, open rectangular adjusting plate, make its opening degree stabilize at 19%-21%;After preheating, enter production mode, cut tobacco is in drum inside, stir-fry and advance, until fall into the vibration groove under discharge cover, and according to the difference of cut tobacco incoming moisture and outlet moisture, adjust drum temperature, and according to the difference of outlet moisture set value and actual value after drying, adjust the opening degree of rectangular adjusting plate;After production task is finished, thin plate cut tobacco machine is cooled, and in cooling process, the opening degree of rectangular adjusting plate is adjusted to 100%。The thin plate cut tobacco machine exhaust air door control method of the application, in preheating stage, drying stage and cooling stage, implement the opening degree adjustment strategy of rectangular adjusting plate in stages, ensure that drum is in moisture balance, simultaneously, rectangular adjusting plate is not influenced by negative pressure gas, ensure that on-off control in rectangular pipe is more accurate.

Description

Technical Field

[0001] This invention relates to the field of tobacco production technology, and in particular to a method for controlling the dehumidification damper of a thin-plate drying machine. 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 method to control the dehumidification damper of a thin plate drying machine. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controlling the dehumidification damper of a thin-plate drying machine to solve the problems in the prior art. This method enables a phased opening adjustment strategy of the rectangular adjustment plate during the preheating, drying, and cooling stages to ensure moisture balance within the drum. At the same time, the rectangular adjustment plate is not affected by negative pressure gas, ensuring more precise control of the switching quantity within the rectangular pipe.

[0006] This invention provides a method for controlling the dehumidification damper of a thin plate drying machine, comprising:

[0007] The rollers of the thin plate drying machine are preheated, and during the preheating process, the rectangular adjusting plate is opened and the opening of the rectangular adjusting plate is stabilized at 19%-21%. A rectangular pipe is set between the dehumidification pipe and the outlet pipe of the dehumidification and rotating screen. The rectangular adjusting plate is set inside the rectangular pipe and the rectangular adjusting plate can slide up and down.

[0008] After preheating, the production mode is entered. The expanded leaf filaments, after being expanded by the tunnel-type rehumidifier, enter the thin plate drying machine for drying. The leaf filaments are continuously tumbled and moved forward in the drum until they fall onto the vibrating groove below the discharge hood. The temperature of the drum is adjusted according to the difference between the moisture content of the incoming leaf filaments and the moisture content at the outlet after drying. At the same time, the opening of the rectangular adjustment plate is adjusted according to the difference between the set value of the moisture content at the outlet after drying and the actual value of the moisture content at the outlet after drying. The discharge hood is located at the outlet end of the drum.

[0009] After the production task is completed, the thin plate drying machine is cooled. During the cooling process, the opening of the rectangular adjustment plate is adjusted to 100% to make the roller cool down quickly.

[0010] The dehumidification damper control method for the thin sheet drying machine described above, preferably, includes the following: Preheating the drum of the thin sheet drying machine specifically includes:

[0011] Turn on the computer screen to display the filament drying machine operation interface, and click Preheat Start;

[0012] The drive drum rotates at a first preset speed, while simultaneously driving the dehumidification fan to operate, thereby creating a negative pressure in the dehumidification pipe. This draws the moisture and dust generated by the blades during heat exchange into the dehumidification box, and then filters them through a cloth bag before discharging them outdoors.

[0013] By cooperating with the cylinder, swing arm, worm shaft, worm wheel, lead screw and electric converter, the rectangular adjustment plate is opened, and the opening of the rectangular adjustment plate is stabilized at 19%-21% based on the actual opening of the rectangular adjustment plate and the detection results of the vertical movement distance of the lead screw by the telescopic scale.

[0014] By observing whether the sealing soft curtain installed under the discharge hood of the wire drying machine is tilted inward towards the discharge hood, it can be determined whether the inside of the roller is under negative pressure.

[0015] Heat energy is supplied to the drum via saturated steam.

[0016] The dehumidification damper control method for the thin sheet drying machine described above, preferably, involves the drive roller rotating at a first preset speed, simultaneously driving the dehumidification fan to operate, thereby creating a negative pressure within the dehumidification pipe. This draws the moisture and dust generated during the heat exchange process of the filaments into a collection box, and then filters them through a cloth bag before discharging them outdoors. Specifically, this includes:

[0017] According to the PID parameters, the drum is driven by a dehumidification motor to rotate at a speed of 5r / min-7r / min. At the same time, the dehumidification motor drives the dehumidification fan at a frequency of 30Hz-40Hz to create a negative pressure in the dehumidification pipeline composed of the first pipeline and the second pipeline. The moisture and dust generated by the blades during heat exchange are drawn by the dehumidification fan into the dehumidification box and discharged outdoors through a filter bag. The dehumidification fan and the dehumidification box are connected by the first pipeline, the second pipeline is located at the inlet of the dehumidification box, and the dehumidification rotating screen is located on the upper part of the discharge hood.

[0018] In the aforementioned method for controlling the dehumidification damper of a thin-plate drying machine, preferably, the lead screw is vertically positioned above the rectangular adjusting plate; a worm gear is positioned at the top of the lead screw; a worm shaft is positioned at the end of the worm gear; a worm is positioned outside the worm shaft, and the worm is coaxial with the worm shaft; a swing arm is connected to the worm shaft; a cylinder is connected to the top of the swing arm; an electric converter is positioned on one side of the upper part of the rectangular pipe; the electric converter is screwed to the rectangular pipe; and a telescopic scale is positioned horizontally above the electric converter.

[0019] The process involves the coordinated operation of a cylinder, swing arm, worm shaft, worm wheel, lead screw, and electric converter to open the rectangular adjustment plate. Based on the actual opening degree of the rectangular adjustment plate and the detection results of the lead screw's vertical movement distance using a telescopic scale, the opening degree of the rectangular adjustment plate is stabilized between 19% and 21%. Specifically, this includes:

[0020] The rectangular adjusting plate, according to the PID set parameters, inputs compressed air at a pressure of 0.5 MPa into the cylinder via an electrical converter. This drives the piston rod of the cylinder to pull the swing arm, which in turn drives the worm shaft to mesh with the worm wheel. Simultaneously, the internal thread of the worm wheel engages with the lead screw, gradually opening the rectangular adjusting plate to 20% of its total opening. At the same time, the PID controller transmits the execution signal indicating that the rectangular adjusting plate has reached 20% of its total opening to the electric converter, which drives the telescopic scale to detect the vertical movement distance of the lead screw. The detection result of the telescopic scale is then compared with the execution signal of the cylinder driving the rectangular adjusting plate to the PLC controller. If an error occurs, the PLC controller transmits the signal to the PID controller for further correction and adjustment to ensure that the opening of the rectangular adjusting plate is accurately executed.

[0021] The dehumidification damper control method for the thin sheet drying machine described above, preferably, involves providing heat energy to the drum via saturated steam, specifically including:

[0022] Saturated steam provides heat to the drum in two ways. The first way is to send steam into the rotating drum through a rotary joint located at the end face of the discharge hood to heat the 12 arc-shaped plates and 12 lifting plates. As the drum rotates, the steam exchanges heat with the blades inside the drum to achieve the drying purpose. The steam that has completed the heat exchange inside the drum is discharged to the outside through the rotary joint. The second way is to heat the air through a heat exchanger located at the bottom of the drum to form process hot air, which is sent into the drum from the inlet and outlet to dry the humid air generated after the high temperature and high humidity blades exchange heat inside the drum.

[0023] The dehumidification damper control method for the thin sheet filament drying machine described above, preferably, involves the following steps: After preheating, the filaments, expanded by the tunnel-type rehumidifier, enter the thin sheet filament drying machine for drying. The filaments are continuously tumbled and moved forward within the drum until they fall onto the vibrating trough below the discharge hood. The drum temperature is adjusted based on the difference between the incoming moisture content and the outlet moisture content. Simultaneously, the opening of the rectangular adjusting plate is adjusted based on the difference between the set outlet moisture content and the actual outlet moisture content. Specifically, this includes:

[0024] When the temperature of the drum wall reaches 130℃-140℃ and the hot air temperature reaches 108℃-112℃, the screen displays that the preheating process is complete. Then, the PLC automatically switches to production mode, and the front-end and back-end equipment of the thin plate drying machine start sequentially under the action of the linkage signal.

[0025] The filaments, after being expanded in a tunnel-type rehumidifier to a moisture content of 22%-25%, enter the inclined thin-plate filament drying machine from left to right. A drum dehumidification motor drives the drum to rotate via a transmission device located at the drum's feed end, increasing the drum's speed from 5-7 r / min to 10-12 r / min. The drum wall temperature is maintained at 130℃-140℃, and the hot air temperature reaches 108℃-112℃. The filaments are continuously tumbled and moved forward within the drum until they fall onto the vibrating trough below the discharge hood. As the filaments pass through the drum, they come into direct contact with the heated drum wall, continuously increasing their temperature and causing the internal moisture to vaporize and dry. Simultaneously, the filaments located within the drum... The lower heat exchanger heats the air, which is then fed by the main process hot air fan. The hot air enters the drum from the upper inlet end through the upper hot air duct and comes into contact with the blades. This dries the water vapor and impurities generated during the drying process. The exhaust gas is filtered through the dehumidification screen and discharged outside the drum, thus achieving the drying purpose. By adjusting the drum temperature, hot air temperature, and dehumidification air volume, the outlet moisture content of the blades after drying is ensured to be stable. In the process of adjusting the drum temperature, hot air temperature, and dehumidification air volume, the dehumidification air volume is adjusted first. If adjusting the dehumidification air volume cannot meet the outlet moisture requirements, then the hot air volume and drum temperature are adjusted to ensure that the outlet moisture content is controlled within the process requirements.

[0026] In the aforementioned method for controlling the dehumidification damper of a thin sheet drying machine, preferably, the adjustment process of the drum temperature and hot air temperature during the filament drying process is as follows:

[0027] The blades absorb the heat generated by the temperature zone of 130℃-140℃ formed by the arc plate and the lifting plate on the inner wall of the drum. At the same time, the blades rotate with the drum at a 3° angle and continuously roll forward under the action of the lifting plate inside the drum, completing the heat exchange process, so that the moisture content of the dried blades reaches 12.5%-13.5%.

[0028] The process gas, heated by the heat exchanger at the bottom of the drum, reaches a temperature of 108℃-112℃. It is then divided into two paths through the hot air duct. One path enters the drum through the inlet end, where it exchanges heat with the humid air generated during the drying process and carries away moisture. The other path heats the humid air around the dehumidification screen in the discharge hood to reduce condensation and water loss.

[0029] The PID controller calculates the amount of dewatering of the blades 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 temperature of the drum and the hot air temperature according to the amount of dewatering of the blades.

[0030] The dehumidification damper control method for the thin sheet drying machine described above, preferably, involves adjusting the dehumidification air volume during the filament drying process as follows: Through the coordination of the cylinder, swing arm, worm shaft, worm wheel, lead screw, and electric converter, the opening of the rectangular adjusting plate is adjusted according to the difference between the set value and the actual value of the outlet moisture content after drying. Specifically, this includes:

[0031] The PID controller calculates the difference between the set value and the actual value of the outlet moisture after drying, obtaining the moisture adjustment deviation. Based on the moisture adjustment deviation, the PID controller uses an electrical converter to input compressed air that meets the pressure requirements into the cylinder, driving the piston rod of the cylinder to pull the swing arm and drive the worm shaft to mesh with the worm wheel. At the same time, the internal thread of the worm wheel engages with the lead screw, adjusting the vertical movement distance of the rectangular adjustment plate. By adjusting the opening of the rectangular adjustment plate, the dehumidification air volume is adjusted, thereby adjusting the relative humidity inside the thin plate drying machine, and thus adjusting the outlet moisture after drying to be close to the set value, meeting the moisture requirements after drying.

[0032] The dehumidification damper control method for the thin sheet wire drying machine described above preferably involves cooling the thin sheet wire drying machine after the production task is completed, and adjusting the opening of the rectangular adjusting plate to 100% during the cooling process to rapidly cool the rollers. Specifically, this includes:

[0033] The PLC controller issues a command to close the steam supply valve to the cylinder wall and the steam supply valve to the heat exchanger. The drum continues to run at a speed of 5r / min-7r / min according to the PID parameter settings.

[0034] The rectangular adjustment plate inputs compressed air at a pressure of 3 MPa into the cylinder through an electrical converter according to the PID set parameter value. This drives the piston rod of the cylinder to pull the swing arm, which in turn drives the worm shaft to mesh with the worm wheel. At the same time, the internal thread of the worm wheel engages with the lead screw, gradually opening the rectangular adjustment plate and adjusting its opening to 100%, thus rapidly reducing the temperature of the drum body.

[0035] When the steam return water temperature sensor on the drum wall detects that the water temperature has reached the preset temperature threshold, it sends a signal to the PLC controller, which then issues a command to stop the drum from running.

[0036] In the aforementioned method for controlling the dehumidification damper of a thin sheet drying machine, preferably, the adjustment process of the rectangular adjusting plate's movement during the preheating, drying, and cooling processes of the thin sheet drying machine is as follows:

[0037] Based on the distance *r* from the edge of the piston rod arc-shaped hole in the cylinder to the axis of the worm, the rotation angle of the worm corresponding to the horizontal swing range *x* of the swing arm within the piston rod arc-shaped hole in the cylinder is calculated using the following formula.

[0038]

[0039] According to the rotation angle corresponding to the worm Given the transmission ratio i between the worm and the worm wheel, calculate the corresponding rotation angle θ of the worm wheel.

[0040]

[0041] The transmission ratio i is calculated using the following formula: i = Z2 / Z1, where Z1 represents the number of threads in the worm gear and Z2 represents the number of teeth in the worm wheel.

[0042] Based on the rotation angle of the worm gear and the pitch P of the lead screw, the movement S of the rectangular adjusting plate is calculated using the following formula:

[0043]

[0044] This invention provides a method for controlling the dehumidification damper of a thin-plate filament drying machine. In the preheating stage, a rectangular adjusting plate is opened and its opening is stabilized at 19%-21%. In the drying stage, the filaments are continuously tumbled and advanced within the drum until they fall onto the vibrating trough below the discharge hood. The drum temperature is adjusted based on the difference between the incoming moisture content and the dried outlet moisture content. Simultaneously, the opening of the rectangular adjusting plate is adjusted based on the difference between the set and actual dried outlet moisture content. In the cooling stage, the rectangular adjusting plate opening is adjusted to 100% to rapidly cool the drum. This allows for stepless adjustment of the rectangular adjusting plate's movement, ensuring moisture balance within the drum and quickly meeting the requirement for the outlet moisture content to reach the set value. The method utilizes a cylinder, swing arm, worm shaft, worm wheel, lead screw, and... With the assistance of the electric converter, the rectangular adjustment plate is opened. Based on the actual opening of the rectangular adjustment plate and the detection results of the screw's vertical movement distance using the extendable scale, the opening of the rectangular adjustment plate is adjusted to achieve automatic adjustment of the moisture content at the outlet of the drying machine. The high integration of electrical and mechanical components serves as the power source for the rectangular adjustment plate. The actuator has been changed from a circular flap to a rectangular adjustment plate. The rectangular adjustment plate is not affected by negative pressure gas, ensuring more precise on / off control within the rectangular pipe. This allows for timely and accurate discharge of moisture from the drying machine drum, thus ensuring stable moisture content at the outlet of the drying machine. This improves the post-drying moisture content deviation and pass rate, while significantly enhancing the product quality of the filament elasticity, crimp, and filling value, reducing the labor intensity of frequent operator intervention and moisture control adjustments. Attached Figure Description

[0045] 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:

[0046] Figure 1 A flowchart illustrating an embodiment of the dehumidification damper control method for a thin-plate wire drying machine provided by the present invention;

[0047] Figure 2 A schematic diagram of the structure of an embodiment of the dehumidification damper control device for a thin plate drying machine provided by the present invention;

[0048] Figure 3 for Figure 2 A cross-sectional view along direction D;

[0049] Figure 4 This is a schematic diagram illustrating the principle of calculating the movement of the rectangular adjustment plate.

[0050] Explanation of reference numerals in the attached diagram: 1-Desiccation motor, 2-Desiccation fan, 3-First pipe, 4-First flange, 5-Desiccation box, 6-Second pipe, 7-External threaded screw, 8-Butterfly spring, 9-Protective cover, 10-Acrylic glass plate, 11-Worm gear, 12-Worm, 13-Swing arm, 14-Worm shaft, 15-Tension spring, 16-Cylinder, 17-First fixing frame, 18-Second flange, 19-Threaded screw, 20-Extendable scale, 21-Electric converter, 22-Screw, 23-Split cap, 2 4-Sealed chamber, 25-Rolling bearing, 26-Spacer, 27-Irregular nut, 28-Cotter pin, 29-Smooth shaft, 30-Snap ring, 31-Thrust ball bearing, 32-U-groove, 33-Smooth shaft screw, 34-Copper sleeve, 35-Rectangular adjusting plate, 36-U-shaped graphite groove, 37-Sealing brush, 38-Adjusting screw, 39-Damping rotating screen, 40-Discharge hood, 41-Roller, 42-Bracket, 43-Rectangular pipe, 44-Flange hole, 45-Second fixed bracket, 47-Piston rod arc hole. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] like Figure 1 As shown, this embodiment of the invention provides a method for controlling the dehumidification damper of a thin-plate drying machine. This method is implemented based on a control device for the dehumidification damper of a thin-plate drying machine, such as... Figure 2 and Figure 3 As shown, the dehumidification damper control device of the thin plate drying machine includes: a support 42 located on the ground, a roller 41 mounted on the support 42, a discharge hood 40 at the outlet end of the roller 41, and a dehumidification rotating screen 39 mounted on the upper part of the discharge hood 40; a dehumidification fan 2 and a dehumidification box 5 are sequentially mounted on the second floor, the dehumidification fan 2 and the dehumidification box 5 are connected by a first pipe 3, a second pipe 6 is provided at the inlet of the dehumidification box 5, and a rectangular pipe 43 is provided between the second pipe 6 and the outlet pipe of the dehumidification rotating screen 39; a sliding rectangular adjusting plate 35 is provided inside the rectangular pipe 43, a screw rod 19 is vertically mounted above the rectangular adjusting plate 35, and a screw rod 19 is provided on one side of the upper part of the rectangular pipe 43. The electric converter 21 has a first fixed frame 17 on one side. The electric converter 21 is screwed to the rectangular pipe 43. A telescopic scale 20 is provided on the upper part of the electric converter 21 in the horizontal direction. The telescopic scale 20 is used to detect the vertical movement distance of the lead screw 19. A worm wheel 11 is provided at the top of the lead screw 19. A worm shaft 14 is provided at the end of the worm wheel 11. A worm 12 is provided outside the worm shaft 14 and the worm 12 is coaxial with the worm shaft 14. A swing arm 13 is connected to the worm shaft 14. A cylinder 16 is connected to the top of the swing arm 13. A tension spring 15 is connected to the lower end of the swing arm 13. The end of the tension spring 15 is connected to the first fixed frame 17.

[0057] like Figure 1 As shown, the dehumidification damper control method for the thin plate drying machine provided in this embodiment includes the following steps in actual implementation:

[0058] Step S1: Preheat the roller 41 of the thin plate drying machine. During the preheating process, open the rectangular adjusting plate 35 and stabilize the opening of the rectangular adjusting plate 35 at 19%-21% (e.g., 20%). A rectangular pipe 43 is provided between the outlet pipe of the dehumidification pipe and the outlet pipe of the dehumidification rotating screen 39. The rectangular adjusting plate 35 is located in the rectangular pipe 43 and can slide up and down.

[0059] In one embodiment of the dehumidification damper control method for the thin plate drying machine of the present invention, step S1 may specifically include:

[0060] Step S11: Turn on the computer screen to display the operation interface of the wire drying machine, and click Preheat Start.

[0061] Step S12: Drive the roller 41 to rotate at the first preset speed, and at the same time drive the dehumidification fan to operate, so as to form a negative pressure in the dehumidification pipe, and draw the moisture and dust generated by the blades during the heat exchange process into the dehumidification box 5 by the dehumidification fan 2, and discharge it outdoors through the filter bag.

[0062] Specifically, according to the PID parameters, the drum 41 is driven by the drum dehumidification motor to rotate at a speed of 5r / min-7r / min (e.g., 6r / min). At the same time, the dehumidification motor 1 drives the dehumidification fan 2 to operate at a frequency of 30Hz-40Hz (e.g., 35Hz) to form a negative pressure in the dehumidification pipe composed of the first pipe 3 and the second pipe 6. The moisture and dust generated by the blades during the heat exchange process are sucked by the dehumidification fan 2 into the dehumidification box 5 and discharged outdoors through the filter bag. The dehumidification fan 2 and the dehumidification box 5 are connected by the first pipe 3. The second pipe 6 is set at the inlet of the dehumidification box 5. The dehumidification rotating screen 39 is set on the upper part of the discharge hood 40.

[0063] Furthermore, the discharge hood 40 is flange-connected to the roller 41, and the roller 41 is driven to rotate via a reducer chain drive. For example... Figure 2 As shown, the dehumidification rotating screen 39 is installed inside the discharge hood 40 to draw in and filter the moisture generated during the drying process of the leaf filaments inside the filter roller 41; the roller 41 is supported by a bracket 42 to rotate. The first fixing frame 17 is welded to the rectangular pipe 43 as a whole; a second fixing frame 45 is provided above the outlet pipe of the dehumidification rotating screen 39, and the cylinder 16 is located above the second fixing frame 45, and the cylinder 16 is fixed to the second fixing frame 45 by bolts.

[0064] Furthermore, a desiccant motor 1 is provided on one side of the desiccant fan 2 to drive the desiccant fan 2 to rotate, and the desiccant motor 1 is coaxially connected to the desiccant fan 2, such as... Figure 2As shown, the dehumidification motor 1 is located to the left of the dehumidification fan 2; the first pipe 3 is connected to the inlet of the dehumidification fan 2 and the outlet of the dehumidification box 5 via the first flange 4, and the dehumidification box 5 is bolted to the first pipe 3 via the first flange 4; both ends of the rectangular pipe 43 are connected to the second pipe 6 and the outlet pipe of the dehumidification screen 39 via the second flange 18, and the second flange 18 is bolted to the second pipe 6, as shown. Figure 1 As shown, the diameter of the second pipe 6 is larger than the diameter of the first pipe 3; as Figure 2 As shown, the second flange 18 has several flange holes 44 around its perimeter, and the second pipe 6 is connected to the rectangular pipe 43 by bolts passing through the flange holes 44.

[0065] Furthermore, a U-shaped groove 32 is provided on the upper part of the rectangular adjusting plate 35. A copper sleeve 34 is provided in the inner hole of the rectangular adjusting plate 35 and the U-shaped groove 32, and the copper sleeve 34 is interference-fitted with the inner hole of the rectangular adjusting plate 35 and the U-shaped groove 32. An optical axis screw 33 is provided in the circular hole of the U-shaped groove 32 and the copper sleeve 34, and the optical axis screw 33 is interference-fitted with the U-shaped groove 32 and the copper sleeve 34 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 35 for the optical axis screw 33 to pass through, such as... Figure 2 As shown in the enlarged view of part C, the copper sleeve 34 is embedded in the central circular hole of the rectangular adjusting plate 35. The circular hole of the U-shaped groove 32 is also embedded with a copper sleeve 34 and is coaxial with the circular hole of the rectangular adjusting plate 35. A special-shaped nut 27 and an external threaded rod 7 are provided on the outside of the U-shaped groove 32, and the special-shaped nut 27 and the external threaded rod 7 are locked by threaded engagement. A cotter pin 28 is provided in the groove of the special-shaped nut 27. The cotter pin 28 passes through the circular hole of the external threaded rod 7 and locks with the groove opening. The special-shaped nut 27 has six non-through grooves evenly divided in the circumference. The cotter pin 28 passes through the circular hole left by the external threaded rod 7 and locks with the groove opening of the special-shaped nut 27. One end of the optical axis screw 33 is an external threaded screw 7. By engaging with the special-shaped nut 27, the U-shaped groove 32 is locked to the rectangular adjusting plate 35. In the specific implementation, after the special-shaped nut 27 is locked in place, the cotter pin 28 passes through the groove of the special-shaped nut 27 and the circular hole in the same direction as the external threaded screw 7 in sequence to fix it and prevent the special-shaped nut 27 from loosening.

[0066] Furthermore, a butterfly spring 8 is provided on the optical axis of the optical axis screw 33 at the slotted position of the U-shaped groove 32, and the inner ring of the butterfly spring 8 is located on the optical axis of the optical axis screw 33 to tension the distance between the U-shaped groove 32 and the rectangular adjusting plate 35. Figure 2As shown in the enlarged view of part C, the optical axis screw 33 passes through the U-shaped groove 32, the rectangular adjusting plate 35, the round hole of the copper sleeve 34, and the inner ring of the butterfly spring 8. The gap between the U-shaped groove 32 and the rectangular adjusting plate 35 is compensated by the butterfly spring 8. The contact positions between the inner sides of both ends of the U-shaped groove 32 and the rectangular adjusting plate 35 are limited by the butterfly spring 8 installed on the optical axis screw 33, which can prevent the rectangular adjusting plate 35 from swaying in the left and right directions during lifting or lowering, causing jamming, and also prevent hard friction between the rectangular adjusting plate 35 and the U-shaped groove 32.

[0067] Furthermore, a sealing chamber 24 is provided on the upper part of the U-shaped groove 32, and the sealing chamber 24 is machined integrally with the U-shaped groove 32; an optical shaft 29 is arranged vertically inside the sealing chamber 24, the optical shaft 29 is located below the lead screw 19 and is machined integrally with the lead screw 19, and the optical shaft 29 is screwed into the thread in the inner hole of the worm gear 11; a pair of rolling bearings 25 are sleeved on the optical shaft 29, spaced apart vertically, and the rolling bearings 25 are interference-fitted with the optical shaft 29; the sealing chamber 24 on the upper part of the U-shaped groove 32 provides an installation position for the rolling bearings 25, which is equivalent to a bearing seat, and at the same time plays a role in dust prevention, sealing and lubrication; a spacer 26 is sleeved on the optical shaft 29 between the two rolling bearings 25, and the spacer 26 is clearance-fitted with the optical shaft 29, the spacer 26 separates the pair of rolling bearings 25 to reduce To reduce frictional resistance between the inner rings of the two bearings during the rotation of the optical shaft 29, the holes of the rolling bearing 25 and the spacer 26 are located in the sealing chamber 24 and are interference-fitted with the optical shaft 29. A retaining ring 30 is provided below the rolling bearing 25, and a retaining ring groove is provided on the lower side wall of the optical shaft 29. The retaining ring 30 is located in the retaining ring groove to limit the axial movement of the optical shaft 29 and prevent the optical shaft 29 from separating from the bearing during the rising process. It also serves to pull the U-shaped groove 32 during the rotation process. Two thrust ball bearings 31 are arranged horizontally below the optical shaft 29, and the thrust ball bearings 31 roll and rub against the optical shaft 29. The lower end face of the optical shaft 29 acts on the rolling elements of the thrust ball bearings 31 to reduce the bottom frictional resistance when the optical shaft 29 rotates, thereby realizing the rapid lifting and lowering of the U-shaped groove 32, and thus automatically adjusting the opening of the rectangular adjusting plate 35.

[0068] Furthermore, a split-type pressure cover 23 is provided on the upper part of the sealing chamber 24. Screws 22 are provided on both sides of the optical axis 29 on the upper part of the split-type pressure cover 23. The screws 22 are threadedly connected to the sealing chamber 24 to seal the split-type pressure cover 23 to the sealing chamber 24. The split-type pressure cover 23 serves as a dustproof seal and is locked by the screws 22.

[0069] Furthermore, the interface between the rectangular adjusting plate 35 and the rectangular pipe 43 is sealed by a sealing brush 37 to prevent moisture from leaking out of the rectangular pipe 43; the sealing brush 37 has a grooved bracket, and an adjusting screw 38 is provided on the upper part of the rectangular pipe 43, and the adjusting screw 38 is screwed into the internal threaded hole of the grooved bracket of the sealing brush 37, and the grooved bracket can provide an installation position for the sealing brush 37.

[0070] Step S13: Through the cooperation of cylinder 16, swing arm 13, worm shaft 14, worm wheel 11, lead screw 19 and electric converter 21, the rectangular adjustment plate 35 is opened, and the opening of the rectangular adjustment plate 35 is stabilized at 19%-21% (for example, 20%) based on the actual opening of the rectangular adjustment plate 35 and the detection results of the vertical movement distance of the lead screw 19 by the telescopic scale 20.

[0071] The lead screw 19 is vertically positioned above the rectangular adjusting plate 35. A worm wheel 11 is located at the top of the lead screw 19, and a worm shaft 14 is located at the end of the worm wheel 11. A worm 12 is located outside the worm shaft 14, and the worm 12 is coaxial with the worm shaft 14. A swing arm 13 is connected to the worm shaft 14, and a cylinder 16 is connected to the top of the swing arm 13. The electric converter 21 is located on one side of the upper part of the rectangular pipe 43 and is screwed to the rectangular pipe 43. The telescopic scale 20 is horizontally positioned above the electric converter 21.

[0072] Furthermore, such as Figure 2 As shown, the left end of the telescopic scale 20 is mounted on the electric converter 21, and the right end is mounted on the top of the lead screw 19, serving as the actuator of the electric converter 21. It is used to detect the rotational operation of the lead screw 19 in real time, specifically detecting the engagement of the internal thread of the worm gear 11 with the lead screw 19, which pulls the rectangular adjusting plate 35 to move up and down within the rectangular pipe 43. The electric converter 21 serves as the signal power source for the telescopic scale 20. The rectangular pipe 43 provides space for the installation of the rectangular adjusting plate 35.

[0073] Furthermore, the inner ring of the worm gear 11 is threaded and screws into the lead screw 19, while the outer thread of the worm gear 11 meshes with the worm 12. The worm 12 and the worm shaft 14 are separate components connected by a key. The swing arm 13 is located in the square hole on the end face of the worm shaft 14, and the square hole of the swing arm 13 is connected to the worm shaft 14 by a key. The piston rod of the cylinder 16 is connected to the round hole of the swing arm 13 by a pin and a locking plate. During operation, the cylinder 16 is driven by compressed air to pull the swing arm 13 to swing at a certain angle, thereby driving the worm gear 11 to rotate. The two ends of the tension spring 15 are connected to the lower hole of the swing arm 13 and the round hole of the first fixing bracket 17 to prevent external factors from interfering with the transmission.

[0074] Specifically, the rectangular adjusting plate 35, according to the PID set parameter value, inputs compressed air at a pressure of 0.5 MPa into the cylinder 16 through an electrical converter. This drives the piston rod of the cylinder 16 to pull the swing arm 13, which in turn drives the worm shaft 14 to mesh with the worm wheel 11. Simultaneously, the internal thread of the worm wheel 11 engages with the lead screw 19, gradually opening the rectangular adjusting plate 35 to 20% of its total opening. At the same time, the PID controller transmits the execution signal indicating that the rectangular adjusting plate 35 has reached 20% of its total opening to the electric converter 21. This drives the telescopic scale 20 to detect the vertical movement distance of the lead screw 19. The detection result of the telescopic scale is then compared with the execution signal from the cylinder 16 driving the rectangular adjusting plate 35 to the PLC controller. When an error occurs, the PLC controller transmits the signal to the PID controller for further correction and adjustment to ensure that the opening of the rectangular adjusting plate 35 is accurately executed. Furthermore, the two ends of the tension spring 15 are respectively located in the circular holes of the swing arm 13 and the first fixed frame 17, and the tension spring 15 can restrict the degree of freedom of the swing arm 13. At the same time, the tension spring 15 pulls the lower end of the swing arm 13 to fix it to the first fixed frame 17, maintaining the balance between the output and input forces of the cylinder 16 and preventing the worm gear 12 and worm wheel 11 from feeding out of order.

[0075] If there is an error, the piston rod of cylinder 16 pushes and pulls, driving the lead screw 19 to correct the deviation, which has a self-adjusting function. The adjustment feedback range of the telescopic scale 20 is the starting position of the rectangular adjustment plate 35, which solves the problem of the gas affecting the control accuracy of the dehumidification damper when the dehumidification pipe is in a negative pressure state during the production process of the drying machine.

[0076] Furthermore, U-shaped graphite grooves 36 are provided on the inner walls of both sides of the rectangular pipe 43, and the rectangular adjusting plate 35 can slide in the U-shaped graphite grooves 36. The inner wall of the U-shaped graphite grooves 36 is made of graphite strips. The U-shaped graphite grooves 36 facilitate the up-and-down adjustment of the rectangular adjusting plate 35 and limit the swing of the rectangular adjusting plate 35. The dehumidification rotating screen 39 and the discharge hood 40 are fixed by bearing seats. The second pipe 6 is sealed to the dehumidification box 5 through a flange located inside the second pipe 6. The rectangular adjusting plate 35 is installed inside the rectangular pipe 43, and the dehumidification regulating damper is the rectangular adjusting plate 35. In specific implementation, the rectangular adjusting plate 35 is inserted into the U-shaped graphite grooves 36, which enables the rectangular adjusting plate 35 to move up and down, adjusts the amount of moisture passing through the dehumidification rotating screen 39 in the suction roller 41, and realizes the outlet moisture control of the filament drying machine.

[0077] In existing technology, the actuator for regulating the exhaust air volume is a circular damper installed inside a circular duct. This damper is screwed onto a vertically positioned rod within the duct, and the power source is a pneumatic valve head acting on the rod. The circular duct is constantly under negative pressure, causing the damper to oscillate. The adjustment process involves air resistance, resulting in a slow response. Furthermore, the gas power source is easily compressible and affected by the negative pressure within the duct, leading to fluctuations. These factors combined prevent the circular damper from promptly expelling moisture from the drum to the outside. This application uses a rectangular adjusting plate 35 installed inside a rectangular pipe 43 instead of a circular damper. A U-shaped graphite groove 36 is installed on the inner side of the rectangular pipe 43 along the width direction to allow the rectangular adjusting plate 35 to move up and down. This prevents the negative pressure air inside the rectangular pipe 43 from affecting the swing of the rectangular adjusting plate 35. At the same time, the actuator is a cylinder 16 driving a worm gear 11 and a worm 12 with self-locking transmission. Therefore, the rectangular adjusting plate 35 is not affected by the negative pressure gas in the pipe, ensuring more precise on / off control inside the rectangular pipe 43. This allows the moisture in the roller 41 of the drying machine to be discharged in a timely and accurate manner, thereby ensuring stable moisture content at the outlet of the drying machine. This improves the moisture content deviation and pass rate after drying. At the same time, the product quality of the filament elasticity, crimp, and filling value is greatly improved, reducing the labor intensity of frequent intervention and adjustment of moisture control by the operator.

[0078] Furthermore, such as Figure 2As shown, a protective cover 9 is provided on the upper part of the rectangular pipe 43, and the protective cover 9 is connected to the rectangular pipe 43 by screws; plexiglass plates 10 are provided on both sides of the protective cover 9, and the plexiglass plates 10 are connected to the protective cover 9 by screws; the worm gear 11, the worm 12, the swing arm 13, the worm shaft 14, the tension spring 15, the first fixing frame 17, and the lead screw 19 are located inside the protective cover 9, and one end of the worm shaft 14 is fixed to the protective cover 9 by a bearing seat. The adjusting mechanism and transmission mechanism of the rectangular adjusting plate 35 are sealed in the cover body by the protective cover 9. The plexiglass plates 10 on both sides are fixed to the steel plate frame by screws, which facilitates observation of its status during operation, and the other two sides are fixed by steel plates. An elongated hole is opened on one side (e.g., the left side) of the protective cover 9 for raising and lowering the telescopic ruler 20.

[0079] Step S14: By observing whether the sealing soft curtain installed at the bottom of the discharge hood 40 of the wire drying machine is tilted inward (e.g., with an inclination angle of 10°), it is determined whether the inside of the roller 41 is under negative pressure to prevent dust inside the roller 41 from being sprayed out.

[0080] Step S15: Provide heat energy to drum 41 through saturated steam.

[0081] Specifically, saturated steam provides heat to the drum 41 in two ways. The first way is to send steam into the rotating drum 41 through a rotary joint located on the end face of the discharge hood 40 to heat the 12 arc-shaped plates and 12 lifting plates. As the drum 41 rotates, it completes heat exchange with the blades inside the drum 41 to achieve the drying purpose. The steam that has completed heat exchange inside the drum 41 is discharged to the outside through the rotary joint. The second way is to heat the air through a heat exchanger located at the bottom of the drum 41 to form process hot air, which is sent into the drum 41 from the inlet and outlet of the drum 41 to dry the humid air generated after the high temperature and high humidity blades exchange heat inside the drum 41.

[0082] Step S2: After preheating, the production mode is entered. The expanded leaf filaments after passing through the tunnel-type rehumidifier enter the thin plate drying machine for drying. The leaf filaments are continuously tumbled and moved forward in the drum 41 until they fall onto the vibrating groove below the discharge hood 40. The temperature of the drum 41 is adjusted according to the difference between the moisture content of the incoming leaf filaments and the moisture content at the outlet after drying. At the same time, the opening of the rectangular adjustment plate 35 is adjusted according to the difference between the set value of the moisture content at the outlet after drying and the actual value of the moisture content at the outlet after drying. The discharge hood 40 is located at the outlet end of the drum 41.

[0083] In one embodiment of the dehumidification damper control method for the thin plate drying machine of the present invention, step S2 may specifically include:

[0084] Step S21: When the temperature of the cylinder wall of roller 41 reaches 130℃-140℃ and the hot air temperature reaches 108℃-112℃, the screen displays that the preheating process is complete. Then, the PLC automatically switches to production mode, and the front-end and back-end equipment of the thin plate drying machine start sequentially under the action of the linkage signal.

[0085] Among these, the cylinder wall temperature and the hot air temperature are independent conditions that must be met simultaneously.

[0086] Step S22: Leaf drying. The leaf fibers, expanded by a tunnel-type rehumidifier to a moisture content of 22%-25%, enter the inclined thin-plate drying machine from left to right. A drum dehumidification motor drives the drum 41 to rotate via a transmission device located at the feed end of the drum 41, increasing the drum 41 speed from 5-7 r / min (e.g., 6 r / min) to 10-12 r / min (e.g., 11 r / min). The drum wall temperature is maintained at 130℃-140℃, and the hot air temperature reaches 108℃-112℃. The leaf fibers continuously tumble and advance within the drum 41 until they fall onto the vibrating trough below the discharge hood 40. As the leaf fibers pass through the drum 41, they directly contact the heated drum wall and continuously heat up. The moisture in the air is vaporized and dried. At the same time, the heat exchanger located at the bottom of the drum 41 heats the air, which is then driven by the main process hot air fan. The hot air enters the drum 41 from the upper part of the inlet end through the hot air duct at the top of the drum 41 and comes into contact with the blades. This dries the water vapor and impurities generated during the drying process. The exhaust gas is filtered through the dehumidification screen 39 and discharged outside the drum 41, thus achieving the purpose of drying. The outlet moisture content of the blades is kept stable by adjusting the drum temperature, hot air temperature, and dehumidification air volume. In the process of adjusting the drum temperature, hot air temperature, and dehumidification air volume, the dehumidification air volume is adjusted first. If the outlet moisture content cannot be met by adjusting the dehumidification air volume, the hot air volume and drum temperature are then adjusted to ensure that the outlet moisture content is controlled within the process requirements.

[0087] Both the drum temperature and the hot air temperature of the drum 41 can dry the tobacco shreds. Simultaneously, the opening of the rectangular regulating plate 35 determines the exhaust air volume, altering the relative humidity within the drying machine. During the tobacco shred drying and dehydration control process, the drum temperature, hot air temperature, and exhaust air volume work in coordination to ensure stable outlet moisture content after drying. Since the discharge end of the drum 41 is closest to the moisture meter, adjusting the opening of the rectangular regulating plate 35 is the most direct and fastest way to regulate the exhaust air volume. If the tobacco drying machine's exhaust system malfunctions or the exhaust damper is improperly adjusted, the evaporated moisture cannot be discharged, leading to an increase in drying temperature and ultimately, excessively high moisture content and temperature in the discharged tobacco shreds. The evaporated moisture cannot be discharged and can only escape from the drying machine's outlet. Simultaneously, some steam accumulates on the inner wall of the discharge hood 40 and the exhaust screen 39, condensing and mixing with tobacco dust to produce black water. This black water flows down into the dried tobacco shreds, causing fluctuations in outlet moisture content. Therefore, proper control of the dehumidification system is crucial for the normal operation of the yarn drying machine and other equipment.

[0088] In some embodiments of the present invention, the adjustment process of the drum temperature of the drum 41 and the hot air temperature during the leaf drying process is as follows:

[0089] Step S221: The blades absorb the heat generated by the temperature zone of 130℃-140℃ formed by the arc plate and the lifting plate on the inner wall of the drum 41. At the same time, the blades rotate with the drum 41 at an inclination angle of 3°. Under the action of the lifting plate inside the drum 41, the blades continuously roll and move forward, completing the heat exchange process, so that the moisture content of the dried blades reaches 12.5%-13.5%.

[0090] Step S222: The process gas, heated by the heat exchanger at the bottom of the drum 41, has a temperature of 108℃-112℃. It is divided into two paths through the hot air duct. One path enters the drum 41 through the inlet end of the drum 41 and exchanges heat with the humid air generated during the drying process, carrying away moisture. The other path heats the humid air around the dehumidification rotating screen 39 in the discharge hood 40 to reduce condensation and water condensation.

[0091] Step S223: The PID controller calculates the amount of dewatering of the blades 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 temperature of the drum 41 and the hot air temperature according to the amount of dewatering of the blades.

[0092] Furthermore, in some embodiments of the present invention, the process of adjusting the exhaust air volume during the leaf drying process is as follows: through the cooperation of cylinder 16, swing arm 13, worm shaft 14, worm wheel 11, lead screw 19 and electric converter 21, the opening of rectangular adjustment plate 35 is adjusted according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying. Specifically, the PID controller calculates the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying to obtain the moisture adjustment deviation, and according to the moisture adjustment deviation, the PID control electric converter inputs compressed air that meets the pressure requirements to cylinder 16 to drive the piston rod of cylinder 16 to pull swing arm 13 to drive worm shaft 14 to mesh with worm wheel 11. At the same time, the internal thread of worm wheel 11 engages with lead screw 19, adjusting the up and down movement distance of rectangular adjustment plate 35. By adjusting the opening of rectangular adjustment plate 35, the exhaust air volume is adjusted, thereby adjusting the relative humidity in the thin plate drying machine, and thus adjusting the outlet moisture after drying to be close to the set value, meeting the moisture requirements after drying. In some embodiments of the present invention, the opening range of the rectangular adjustment plate 35 is 30%-40%.

[0093] Step S3: After the production task is completed, the thin plate wire drying machine is cooled. During the cooling process, the opening of the rectangular adjusting plate 35 is adjusted to 100% so that the roller 41 can be cooled down quickly.

[0094] In one embodiment of the dehumidification damper control method for the thin plate drying machine of the present invention, step S3 may specifically include:

[0095] Step S31: The PLC controller issues a command to close the steam supply valve to the cylinder wall and the steam supply valve to the heat exchanger. The drum continues to run at a speed of 5r / min-7r / min (e.g., 6r / min) according to the PID parameter settings.

[0096] Step S32: The rectangular adjustment plate 35 inputs compressed air at a pressure of 3 MPa to the cylinder 16 through the electrical converter according to the PID set parameter value. This drives the piston rod of the cylinder to pull the swing arm 13, which drives the worm shaft 14 to mesh with the worm wheel 11. At the same time, the internal thread of the worm wheel 11 engages with the lead screw 19, gradually opening the rectangular adjustment plate 35 and adjusting the opening of the rectangular adjustment plate 35 to 100%, thereby rapidly reducing the cylinder temperature of the drum 41.

[0097] Step S33: When the steam return water temperature sensor on the cylinder wall detects that the water temperature has reached the preset temperature threshold (e.g., 60°C), it feeds back the signal to the PLC controller, and the PLC controller issues a command to stop the drum 41 from running.

[0098] Furthermore, during the preheating (step S1), drying (step S2), and cooling (step S3) processes of the thin plate drying machine, the adjustment process of the movement of the rectangular adjusting plate 35 is as follows:

[0099] like Figure 4 As shown, based on the axial distance r from the edge of the piston rod arc-shaped hole 47 of the cylinder 16 to the worm gear 12, the rotation angle corresponding to the worm gear 12 when the swing range of the swing arm 13 in the horizontal direction within the piston rod arc-shaped hole 47 of the cylinder 16 is x is calculated using the following formula.

[0100]

[0101] The piston rod arc-shaped hole 47 is located on the edge of the cylinder 16 near the swing arm 13.

[0102] In some embodiments of the present invention, r is 57 mm, and formula (1) is an approximate calculation assuming that the value of r remains unchanged when the worm gear 12 rotates at a very small angle.

[0103] Given the transmission ratio i between the worm gear 12 and the worm wheel 11, calculate the rotation angle θ corresponding to the worm wheel 11.

[0104]

[0105] The transmission ratio i is calculated using the following formula: i = Z2 / Z1, where Z1 represents the number of threads in the worm gear 12 and Z2 represents the number of teeth in the worm wheel 11.

[0106] In some embodiments of the present invention, the number of threads of the worm 12 Z1 = 4 and the number of teeth of the worm wheel 11 Z2 is 24, then the transmission ratio i = 6.

[0107] Based on the rotation angle of the worm gear 11 and the pitch P of the lead screw 19, the movement S of the rectangular adjusting plate 35 is calculated using the following formula:

[0108]

[0109] Considering the weight of the rectangular adjusting plate 35 and the need for fine-tuning during the adjustment process, in some embodiments of the present invention, the lead screw 19 is selected as a fine-pitch M30×3mm lead screw with a pitch P = 3mm. In this case, the movement S of the rectangular adjusting plate is calculated as follows:

[0110]

[0111] In a specific implementation of this invention, the position of the swing arm 13 can be manually adjusted to change the value of x, thereby altering the movement of the rectangular adjusting plate 35. The movement of the rectangular adjusting plate 35 can also be adjusted by changing the compressed air output ratio of the electrical converter to change the piston rod reset stroke X of the cylinder, achieving stepless adjustment of the rectangular adjusting plate 35's movement. By inputting the relevant parameters from the formula into the PLC controller, the PLC controller can calculate and adjust the opening degree of the rectangular adjusting plate 35. It should be noted that this invention does not specifically limit the dimensions of the transmission ratio, the lead screw 19, and r.

[0112] The piston rod is driven by cylinder 16 to pull the swing arm 13 forward or push it backward, causing the swing arm 13 to swing. The swing arm 13 drives the worm shaft 14 to drive the worm 12 to engage with the worm wheel 11. At the same time, the inner thread of the worm wheel 11 engages with the lead screw 19, which in turn pulls the U-shaped graphite groove 36 to move the rectangular adjusting plate 35, thereby realizing the automatic adjustment function of the moisture content at the outlet of the filament drying machine. The PID controller integrates electrical signal acquisition, command issuance, and detection feedback functions. The PID controller feeds back the difference between the set value (SP) and the actual value (PV) of the outlet water after drying, so that the PID controller controls the electric converter 21 and the mechanical (worm wheel 11 and worm 12 have the advantage of self-locking). The cylinder 16 pulls the worm 12 and worm wheel 11 to engage and drive the lead screw 19 to rotate. This highly integrated system serves as the adjustment power source for the rectangular adjusting plate 35, ensuring stability and reliability.

[0113] The quality indicators of leaf filament drying before and after the improvement are shown in Table 1 and Table 2, respectively. As can be seen from Table 1 and Table 2, the solution of the present invention can reduce the fluctuation range of outlet moisture, improve the moisture standard deviation and deviation qualification rate after drying, and significantly improve the product quality of leaf filament elasticity, curl, and filling value, thereby increasing its filling capacity. At the same time, it can improve the whole leaf filament rate, reduce leaf filament breakage, and reduce the labor intensity of operators frequently intervening and adjusting moisture control.

[0114] Table 1 Requirements for Improving the Quality Indicators of Leaf Filament (Cylinder Type) Drying

[0115] index Require Moisture content / % 12—14 Moisture content tolerance / % ±0.5 Standard deviation of moisture content 0.07 Temperature / °C 50—65 <![CDATA[Filling value (cm 3 / g)]]> ≥4.0 <![CDATA[Filling value tolerance (cm 3 / g)]]> ±0.3 Whole yarn yield / % ≥80 Broken wire rate / % ≤2.0 Dry head and dry tail / % ≤0.6

[0116] Table 2. Improved Drying Quality Indicators for Filament (Cylinder Type)

[0117]

[0118]

[0119] The filling value of tobacco shreds is one of the important indicators of cigarette tobacco quality, and it has a relatively direct and significant impact on the physical properties of cigarettes, such as hardness and density distribution. It is one of the key indicators for quality control in the cigarette manufacturing industry. Therefore, the elasticity, curl, and moisture fluctuation of the dried tobacco shreds have the most direct impact on the filling value.

[0120] Specific filling value testing method (hardness and density of cigarettes, moisture affects elasticity and curl): Randomly take one sample, weigh 10g using an electronic balance and place it in the filling instrument measuring cylinder. Start the instrument for testing according to the (DD60A) filling tester operating procedure. Repeat the above steps for a total of 5 times. The average value is the test result. The modified filling value test results are shown in Table 3.

[0121] Table 3. Inspection results of the fill value after modification.

[0122]

[0123] Before the modification, the optimal leaf fiber filling value was 4.1cm, influenced by fluctuations in leaf fiber moisture content after drying. 3 / g, by

[0124] Table 3 shows that after the modification and drying, the leaf fiber moisture content remained stable, and the average leaf fiber filling value was 4.24 cm. 3 / g, the leaf filament filling value was significantly improved.

[0125] Standard deviation is a measure of the dispersion of the moisture content distribution of dried leaf fibers, reflecting the degree of dispersion of a set of dried leaf fiber moisture content values. It measures the extent to which the dried leaf fiber moisture content values ​​deviate from the arithmetic mean. Generally, the smaller the standard deviation of the dried leaf fiber moisture content, the less these values ​​deviate from the mean, and vice versa. At the same time, the smaller the differences among the data within the sample, the more concentrated and stable the sample's dried leaf fiber moisture content curve is. Conversely, the larger the standard deviation, the greater the differences among the data within the sample, and the wider the data distribution, meaning the sample's dried leaf fiber moisture content curve is more dispersed.

[0126] The formula for calculating the standard deviation is:

[0127] In the formula, σ represents the standard deviation; n represents the sample size; x i Let represent the i-th sample value; x represents the overall sample mean. The standard deviation of the modified moisture content is shown in Table 4. As shown in Table 4, the average standard deviation of the modified moisture content is 0.042.

[0128] Table 4 Standard Deviation of Moisture Content After Modification

[0129]

[0130] Before the modification, the standard deviation of the moisture content at the outlet of the blade dryer was above 0.07 due to fluctuations in the exhaust damper. After the modification, the rectangular regulating plate in the exhaust pipe provides more precise control, and the moisture content of the blade dryer tends to stabilize and the curve is close to the set value.

[0131] The dehumidification damper control method for a thin-plate filament drying machine provided in this invention involves the following steps: During the preheating stage, a rectangular adjusting plate is opened and its opening is stabilized at 19%-21%. During the drying stage, the filaments are continuously tumbled and advanced within the drum until they fall onto the vibrating trough below the discharge hood. The drum temperature is adjusted based on the difference between the incoming moisture content and the dried outlet moisture content. Simultaneously, the opening of the rectangular adjusting plate is adjusted based on the difference between the set and actual dried outlet moisture content. During the cooling stage, the rectangular adjusting plate opening is adjusted to 100% to rapidly cool the drum. This allows for stepless adjustment of the rectangular adjusting plate's movement, ensuring moisture balance within the drum and quickly meeting the requirement for the outlet moisture content to reach the set value. The method utilizes a cylinder, swing arm, worm shaft, worm wheel, and lead screw. In conjunction with the electric converter, the rectangular adjusting plate is opened, and the opening of the rectangular adjusting plate is adjusted according to the actual opening of the rectangular adjusting plate and the detection results of the vertical movement distance of the lead screw by the telescopic scale, so as to realize the automatic adjustment function of the moisture at the outlet of the drying machine. The high integration of electrical and mechanical systems serves as the adjustment power source for the rectangular adjusting plate. The actuator has been changed from a circular flap to a rectangular adjusting plate. The rectangular adjusting plate is not affected by negative pressure gas, which ensures more precise on / off control in the rectangular pipe. This allows the moisture in the drying machine drum to be discharged in a timely and accurate manner, thereby ensuring the stability of the moisture at the outlet of the drying machine. This improves the moisture deviation and pass rate after drying, while significantly improving the product quality of filament elasticity, crimp, and filling value, and reducing the labor intensity of operators who frequently intervene and adjust the moisture control.

[0132] 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.

[0133] 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 method of controlling the damper of a moisture removal air flow of a cut tobacco sheet dryer, characterized in that, The drum of the thin-plate drying machine is preheated, and during the preheating process, the rectangular adjusting plate is opened and the opening degree of the rectangular adjusting plate is stabilized at 19%-21%, wherein a rectangular pipe is arranged between the moisture removal pipe and the outlet pipe of the moisture removal rotating screen, the rectangular adjusting plate is arranged in the rectangular pipe, and the rectangular adjusting plate can slide up and down; After the preheating is completed, the production mode is entered, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, wherein the discharge cover is arranged at the outlet end of the drum; After the production task is completed, the thin-plate drying machine is cooled, and during the cooling process, the opening degree of the rectangular adjusting plate is adjusted to 100% to rapidly cool the drum, the production mode is entered after the preheating is completed, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, and specifically comprises: During the drying process of the cut tobacco, the adjustment process of the drum temperature and the hot air temperature is as follows: When the cylinder wall temperature of the roller reaches 130 o C-140 o C, while the hot air temperature reaches 108 o C-112 o C, the screen displays that the preheating process is completed, the PLC automatically switches to the production mode, and the front-end equipment and the rear-end equipment of the sheet drying machine are sequentially started under the action of the linkage signal. The dried cut tobacco is expanded in a tunnel-type moisture regenerator, and the cut tobacco with moisture content of 22-25% enters the inclined thin plate dryer from left to right. The drum is driven to rotate by a drum moisture removal motor through a transmission device located at the drum inlet end. The rotation speed of the drum is increased from 5-7 r / min to 10-12 r / min, and the drum wall temperature is maintained at 130 o C-140 o C, the hot air temperature reaches 108 o C-112 o C, the cut tobacco is continuously stirred and forwarded in the drum until it falls into the vibrating trough below the discharge cover. When the cut tobacco passes through the drum, it is in direct contact with the heated drum wall and is continuously heated, and the internal moisture is vaporized and dried. Meanwhile, the heated air is supplied by the main process air blower through the heat exchanger at the lower part of the drum, enters the drum from the upper part of the inlet end of the drum through the upper air duct of the drum, and contacts the cut tobacco, thereby drying the water vapor and green odor generated during the drying process. The waste gas generated is filtered by the moisture removal rotating screen, discharged outside the drum, and dried. The drum temperature, hot air temperature, and moisture removal air volume are adjusted to ensure the stable moisture content of the cut tobacco after drying. During the adjustment of the drum temperature, hot air temperature, and moisture removal air volume, the moisture removal air volume is first adjusted. When the moisture removal air volume cannot meet the outlet moisture requirement, the hot air volume and drum temperature are adjusted to ensure that the outlet moisture content is controlled within the process requirement range. The PID controller calculates the dehydration amount of the cut tobacco according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, and automatically adjusts the temperature of the drum and the hot air temperature according to the dehydration amount of the cut tobacco. The temperature of the inner wall of the cut tobacco absorbing drum formed by the arc-shaped plate and the material lifting plate is 130 o C-140 o The heat generated by the C drum temperature zone, while the cut tobacco moves forward with the drum at 3 o The cut tobacco continuously rolls forward under the action of the material lifting plate in the drum, completes the heat exchange process, and makes the moisture content of the dried cut tobacco reach 12.5%-13.5%. The temperature of the process gas heated by the heat exchanger under the roller is 108 o C-112 o C, is divided into two ways through the hot air pipeline, one way enters the roller through the inlet end of the roller, exchanges heat with the humid hot air formed in the drying process, and carries away the moisture; the other way heats and warms the humid hot air around the moisture removal rotating screen in the discharge cover, reduces the condensation and condensate. The drum of the thin-plate drying machine is preheated, and during the preheating process, the rectangular adjusting plate is opened and the opening degree of the rectangular adjusting plate is stabilized at 19%-21%, wherein a rectangular pipe is arranged between the moisture removal pipe and the outlet pipe of the moisture removal rotating screen, the rectangular adjusting plate is arranged in the rectangular pipe, and the rectangular adjusting plate can slide up and down; 2. The method of claim 1, wherein After the preheating is completed, the production mode is entered, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, wherein the discharge cover is arranged at the outlet end of the drum; After the production task is completed, the thin-plate drying machine is cooled, and during the cooling process, the opening degree of the rectangular adjusting plate is adjusted to 100% to rapidly cool the drum, the production mode is entered after the preheating is completed, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, and specifically comprises: During the drying process of the cut tobacco, the adjustment process of the drum temperature and the hot air temperature is as follows: The PID controller calculates the dehydration amount of the cut tobacco according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, and automatically adjusts the temperature of the drum and the hot air temperature according to the dehydration amount of the cut tobacco. The drum of the thin-plate drying machine is preheated, and during the preheating process, the rectangular adjusting plate is opened and the opening degree of the rectangular adjusting plate is stabilized at 19%-21%, wherein a rectangular pipe is arranged between the moisture removal pipe and the outlet pipe of the moisture removal rotating screen, the rectangular adjusting plate is arranged in the rectangular pipe, and the rectangular adjusting plate can slide up and down; 3. The control method of the moisture removal damper of a cut tobacco dryer according to claim 2, characterized in that, After the preheating is completed, the production mode is entered, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, wherein the discharge cover is arranged at the outlet end of the drum; After the production task is completed, the thin-plate drying machine is cooled, and during the cooling process, the opening degree of the rectangular adjusting plate is adjusted to 100% to rapidly cool the drum, the production mode is entered after the preheating is completed, the expanded cut tobacco after passing through the tunnel-type humidifier enters the thin-plate drying machine to be dried, the cut tobacco continuously stirs and advances in the drum until falls into the vibrating trough below the discharge cover, and according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, the temperature of the drum is adjusted, and according to the difference between the set value of the outlet moisture after drying and the actual value of the outlet moisture after drying, the opening degree of the rectangular adjusting plate is adjusted, and specifically comprises: During the drying process of the cut tobacco, the adjustment process of the drum temperature and the hot air temperature is as follows: The PID controller calculates the dehydration amount of the cut tobacco according to the difference between the moisture of the cut tobacco and the outlet moisture after drying, and automatically adjusts the temperature of the drum and the hot air temperature according to the dehydration amount of the cut tobacco. According to the PID parameters, the cylinder is driven to rotate at a speed of 5r / min-7r / min by the cylinder dehumidification motor, and the dehumidification motor drives the dehumidification fan to operate at a frequency of 30Hz-40Hz to form negative pressure in the dehumidification pipeline composed of the first pipeline and the second pipeline, so that the moisture and dust generated by the cut tobacco during heat exchange are sucked into the moisture collection box by the dehumidification fan, and then filtered by the cloth bag and discharged to the outside, wherein the dehumidification fan and the moisture collection box are connected by the first pipeline, the second pipeline is arranged at the inlet of the moisture collection box, and the dehumidification rotating screen is arranged at the upper part of the discharge cover.

4. The method of claim 2, wherein The screw rod is vertically arranged above the rectangular adjusting plate, the top end of the screw rod is provided with a worm gear, the tail end of the worm gear is provided with a worm shaft, the outside of the worm shaft is provided with a worm, the worm is coaxial with the worm shaft, the worm shaft is connected with a swing arm, and the top end of the swing arm is connected with an air cylinder; the electric converter is arranged on one side of the upper part of the rectangular pipeline, the electric converter is screw connected with the rectangular pipeline, and the telescopic scale is arranged on the upper part of the electric converter in the horizontal direction, The cooperation of the air cylinder, swing arm, worm shaft, worm gear, screw rod and electric converter opens the rectangular adjusting plate, and according to the actual opening degree of the rectangular adjusting plate and the detection result of the up-down moving distance of the screw rod, the opening degree of the rectangular adjusting plate is stabilized at 19%-21%, and the specific steps include: The rectangular adjusting plate inputs the compressed air with a pressure of 0.5Mpa into the air cylinder through the electric converter according to the PID setting parameter value, so as to drive the piston rod of the air cylinder to pull the swing arm to drive the worm shaft and the worm gear to engage, at the same time, the internal threads of the worm gear and the screw rod are screwed, the rectangular adjusting plate is gradually opened, the opening degree of the rectangular adjusting plate reaches 20% of the total opening degree, at the same time, the PID controller transmits the execution signal of the opening degree of the rectangular adjusting plate to 20% of the total opening degree to the electric converter, so as to drive the telescopic scale to detect the up-down moving distance of the screw rod, and the detection result of the telescopic scale and the execution signal of the air cylinder driving the rectangular adjusting plate are transmitted to the PLC controller for comparison, when an error occurs, the PLC controller transmits the signal to the PID controller for further correction and adjustment, so as to ensure that the opening degree of the rectangular adjusting plate is accurately executed.

5. The method of claim 2, wherein The saturated steam provides heat energy to the cylinder, and the specific steps include: The saturated steam provides heat energy to the cylinder in two ways, the first way is to send the steam into the rotating cylinder through the rotary joint located at the end face of the discharge cover, so as to heat the 12 arc-shaped plates and 12 material lifting plates, through the rotation of the cylinder, the heat exchange with the cut tobacco in the cylinder is completed to achieve the purpose of drying, and the steam in the cylinder after heat exchange is discharged to the outside through the rotary joint; the second way is to heat the air through the heat exchanger located at the lower part of the cylinder to form process hot air, which is sent into the cylinder from the inlet and outlet of the cylinder respectively, so as to dry the humid air generated after the high-temperature and high-humidity cut tobacco is heat exchanged in the cylinder.

6. The method of claim 1, wherein In the cut tobacco drying process, the adjustment process of the moisture removal air volume is as follows: through the cooperation of the air cylinder, the swing arm, the worm shaft, the worm gear, the screw rod and the electric converter, the opening of the rectangular adjusting plate is adjusted according to the difference between the set value and the actual value of the moisture at the outlet after drying, and the adjustment process specifically includes: The PID controller calculates the difference between the set value and the actual value of the moisture at the outlet after drying, obtains the moisture adjustment deviation, and inputs the compressed air meeting the pressure requirement into the air cylinder through the PID adjustment electric converter according to the moisture adjustment deviation, so as to drive the piston rod of the air cylinder to pull the swing arm to drive the worm shaft and the worm gear to engage, at the same time, the internal threads of the worm gear and the screw rod are screwed, the up-down moving distance of the rectangular adjusting plate is adjusted, the opening size of the rectangular adjusting plate is adjusted, the moisture removal air volume is adjusted, the relative humidity in the sheet tobacco drying machine is adjusted, and the moisture at the outlet after drying is close to the set value, so as to meet the moisture requirement after drying.

7. The method of claim 1, wherein After the production task is completed, the sheet tobacco drying machine is cooled, and during the cooling process, the opening of the rectangular adjusting plate is adjusted to 100% to quickly cool the drum, and the specific process includes: The PLC controller issues an instruction, the drum wall steam supply valve is closed, the heat exchanger steam supply valve is closed, and the drum continues to run at a speed of 5r / min-7r / min according to the PID parameter setting; The rectangular adjusting plate inputs the compressed air with a pressure of 3Mpa into the air cylinder through the electric converter according to the PID set parameter value, so as to drive the piston rod of the air cylinder to pull the swing arm to drive the worm shaft and the worm gear to engage, at the same time, the internal threads of the worm gear and the screw rod are screwed, the rectangular adjusting plate is gradually opened, the opening of the rectangular adjusting plate is adjusted to 100%, and the temperature of the drum body is quickly reduced; When the drum wall steam backwater temperature sensor detects that the water temperature reaches the preset temperature threshold, the signal is fed back to the PLC controller, and the PLC controller issues an instruction to stop the drum from running.

8. The method of claim 1, wherein During the preheating, drying and cooling processes of the sheet tobacco drying machine, the moving amount adjustment process of the rectangular adjusting plate is as follows: According to the distance r from the edge of the arc-shaped hole of the piston rod of the cylinder to the axis of the worm of the swing arm, the corresponding rotation angle of the worm when the swing range of the swing arm in the horizontal direction within the arc-shaped hole of the piston rod of the cylinder is x is calculated by the following formula : （1）； According to the rotation angle of the worm and the transmission ratio i of the worm and the worm wheel, the rotation angle of the worm wheel is calculated , = / i （2） Wherein, the transmission ratio i is calculated by the following formula: i=Z2 / Z1, wherein Z1 represents the number of worm heads, and Z2 represents the number of worm gear teeth; According to the rotation angle of the worm gear and the pitch P of the screw rod, the moving amount S of the rectangular adjusting plate is calculated by the following formula: （3）。

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