Reconstituted tobacco base heating control system

Abstract

According to the reconstituted tobacco base heating control system, the moisture value of a base is detected through a scanning frame, the corresponding saturated steam pressure is determined based on the moisture value, the pressure of saturated steam conveyed into a steam box through a conveying pipe is adjusted through a pressure adjusting unit, and the temperature of the saturated steam is changed; and the temperature and moisture of the surface of the film base are accurately controlled. Due to the fact that different film bases are different in thickness and water content and different in heat absorption, the height of the steam box can be adjusted through the telescopic mechanism according to the moisture distribution condition of the surfaces of the film bases, steam is evenly distributed above the whole film bases, and it is guaranteed that the film bases obtain the good heating effect. Meanwhile, according to the difference of the water content of different film bases, the pressure of the saturated steam can be adjusted through the pressure adjusting unit to adjust and control the temperature of the saturated steam, so that accurate control over the temperature and the water of the reconstituted tobacco film bases is achieved, and the quality and the uniformity of the reconstituted tobacco are improved.

Description

Technical Field

[0001] The present application relates to the technical field of tobacco processing, and in particular to a reconstituted tobacco leaf base heating control system. Background Art

[0002] In the production process of reconstituted tobacco, the control of sheet heating is a key link, which directly affects the quality, consistency and processing efficiency of the final product. Appropriate temperature and moisture control can ensure that the tobacco fiber is fully combined with other ingredients and help regulate the release of humidity and volatile components.

[0003] In the related art, the quality and uniformity of reconstituted tobacco leaf base are poor. Summary of the invention

[0004] Based on this, it is necessary to provide a reconstituted tobacco leaf base heating control system to address the problem of poor quality and uniformity of existing reconstituted tobacco leaf base.

[0005] A reconstituted tobacco leaf base heating control system, the reconstituted tobacco leaf base heating control system comprising:

[0006] A delivery pipe, one end of which is used to connect to the air supply unit;

[0007] A steam box connected to the other end of the delivery pipe; a plurality of heating units are arranged in the steam box, and each of the heating units is configured with a steam injection hole for spraying saturated steam;

[0008] A telescopic mechanism, the telescopic mechanism is connected to the steam box, and the telescopic mechanism is used to drive the steam box to move in a vertical direction;

[0009] A scanning frame, wherein the scanning frame is provided with a moisture sensor for detecting the moisture value of the film base;

[0010] A pressure regulating unit is arranged on the conveying pipe, and is used to adjust the pressure of saturated steam based on the moisture value of the substrate.

[0011] In one of the embodiments, the reconstituted tobacco leaf base heating control system further includes a control unit communicatively connected to the pressure regulating unit, and the control unit is used to issue a control instruction to the pressure regulating unit to adjust the pressure of saturated steam through the pressure regulating unit.

[0012] In one embodiment, the scanning frame is communicatively connected to the control unit to transmit the moisture value to the control unit.

[0013] In one of the embodiments, the pressure regulating unit includes a pressure regulating valve in communication with the control unit, and the control unit adjusts the opening of the pressure regulating valve by receiving the moisture value output by the scanning frame;

[0014] When the moisture value is greater than the set moisture value, the opening of the pressure regulating valve is increased; when the moisture value is less than the set value, the opening of the pressure regulating valve is reduced.

[0015] In one of the embodiments, the pressure regulating unit further includes a servo mechanism, which is connected to the pressure regulating valve and is used to receive a control instruction issued by the control unit to adjust the opening of the pressure regulating valve.

[0016] In one of the embodiments, the reconstituted tobacco leaf base heating control system further comprises a control panel for parameter display and / or parameter setting;

[0017] And / or, the scanning frame includes a scanning head and a scanning mechanism, the scanning mechanism is used to drive the scanning head to move along the width direction of the film base; the scanning head is provided with the moisture sensor;

[0018] And / or, the scanning frame is also provided with a quantitative sensor for detecting the quantitative amount of the sheet base, and the reconstituted tobacco sheet base heating control system also includes a headbox dilution water actuator, and the headbox dilution water actuator includes a dilution water valve, and the amount of dilution water added is adjusted by controlling the opening of the dilution water valve.

[0019] In one embodiment, the telescopic mechanism includes a rotary drive member, a drive rod, and a drive block threadedly connected to the drive rod, and the drive block is connected to the steam box;

[0020] The driving rod is connected to the rotary driving member and is driven to rotate by the rotary driving member, so that the driving block drives the steam box to move along the vertical direction.

[0021] In one embodiment, the heating unit includes a swirl section, a contraction section and an atomizing spray section, and the swirl section is used to buffer saturated steam;

[0022] Along the vertical direction and in the direction from the swirl section to the atomizing spray section, the flow area of ​​the contraction section gradually decreases;

[0023] The atomizing spray section is configured with the steam spray holes.

[0024] In one of the embodiments, the reconstituted tobacco leaf base heating control system further includes an atomization pipe, one end of the atomization pipe is connected to the delivery pipe, and the other end of the atomization pipe is connected to the swirl section.

[0025] In one embodiment, the reconstituted tobacco leaf base heating control system further comprises a waste heat recovery pipe, wherein the waste heat recovery pipe is connected to an end of the steam box away from the pressure regulating unit;

[0026] and / or, the steam box is provided with a drain port for draining condensed water;

[0027] And / or, the air supply unit is a connected gas cabinet, which is used to provide a compressed air power source; the reconstituted tobacco leaf base heating control system also includes a purge bellows connected to the connected gas cabinet; the purge bellows is used to purge the steam box.

[0028] The above-mentioned reconstituted tobacco leaf base heating control system detects the moisture value of the sheet base through a scanning frame, determines the corresponding saturated steam pressure based on the moisture value, and adjusts the pressure of the saturated steam delivered to the steam box by the conveying pipe through the pressure regulating unit, thereby changing the temperature of the saturated steam, so that the temperature and moisture of the sheet base surface are accurately controlled. As the temperature of the sheet base rises, the viscosity and surface tension of the water contained in it decrease, the fluidity is enhanced, and the dehydration resistance is reduced, so that a better dehydration effect can be obtained in the next process area, such as the pressing area. Due to the different thicknesses and water contents of different sheet bases, the heat absorption is different. Therefore, according to the moisture distribution on the surface of the sheet base, the steam box can be driven to move through the telescopic mechanism to adjust the height of the steam box, that is, adjust the distance between the steam box and the sheet base in the vertical direction, so that the steam is evenly distributed above the entire sheet base to ensure that the sheet base obtains the best heating effect. In the process of being drawn away, the steam reaches heat exchange due to passing through the wet sheet base, thereby increasing the temperature. At the same time, according to the difference in moisture content of different sheet bases, the pressure of saturated steam can be adjusted through the pressure regulating unit to control the temperature of saturated steam, so as to achieve precise control of the temperature and moisture of the sheet base of reconstituted tobacco, thereby improving the quality and uniformity of the reconstituted tobacco leaves. Improving the uniformity of sheet base moisture helps reduce production failures such as breakage and wrinkles, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a reconstituted tobacco leaf base heating control system provided in one embodiment of the present application.

[0030] Figure 2 for Figure 1 The schematic diagram shown is that the steam box in the reconstituted tobacco leaf base heating control system is flipped 180 degrees.

[0031] Figure 3 for Figure 2 A top view of a reconstituted tobacco leaf base heating control system is shown.

[0032] Figure 4 for Figure 2 A side view of a reconstituted tobacco leaf base heating control system is shown.

[0033] Figure 5 A schematic diagram of an atomization tube in a reconstituted tobacco leaf base heating control system provided in one embodiment of the present application.

[0034] Figure 6 A schematic diagram of a heating unit in a reconstituted tobacco leaf base heating control system provided in one embodiment of the present application.

[0035] Figure 7 A schematic diagram of a scanning frame in a reconstituted tobacco leaf base heating control system provided in one embodiment of the present application.

[0036] Figure 8 for Figure 7 A top view of a scanning frame in a reconstituted tobacco leaf base heating control system is shown.

[0037] Figure numbers: 110, conveying pipe; 120, pressure regulating unit; 130, steam box; 140, atomizing pipe; 150, heating unit; 151, swirl section; 152, contraction section; 153, atomizing injection section; 154, steam injection hole; 160, telescopic mechanism; 170, waste heat recovery pipe; 180, drain outlet; 190, switch valve; 200, scanning frame; 210, scanning head; 300, headbox dilution water actuator; 310, dilution water valve; 1000, film base. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] During tobacco processing, the quality of reconstituted tobacco leaves is affected by many factors, among which temperature and moisture are two key factors. The inventors of this application found that the traditional sheet base heating control system directly applies saturated steam to the slurry, which has problems such as inaccurate temperature control, uneven moisture distribution and high steam consumption, resulting in unstable quality of reconstituted tobacco leaves. Based on this, an embodiment of the present application provides a reconstituted tobacco sheet base heating control system, which adjusts the steam temperature by adjusting the pressure of saturated steam, thereby accurately controlling the temperature and moisture of the sheet base surface, thereby ensuring the stability and controllability of the production process.

[0045] Figure 1 A schematic diagram of a reconstituted tobacco leaf base heating control system provided in one embodiment of the present application; Figure 2 for Figure 1 The schematic diagram of the steam box in the reconstituted tobacco leaf base heating control system being turned 180 degrees is shown; Figure 3 for Figure 2 A top view of a reconstituted tobacco leaf base heating control system is shown; Figure 6 This is a schematic diagram of a heating unit in a reconstituted tobacco leaf base heating control system provided in an embodiment of the present application. Figure 1 , Figure 3 and Figure 6 as well as Figure 7 As shown, a reconstituted tobacco leaf base heating control system provided by an embodiment of the present application includes a conveying pipe 110, a steam box 130, a telescopic mechanism 160, a scanning frame 200 and a pressure regulating unit 120. Among them, one end of the conveying pipe 110 is used to connect to the air supply unit, and the other end of the conveying pipe 110 is connected to the steam box 130; a plurality of heating units 150 are arranged in the steam box 130, and each heating unit 150 is configured with a steam injection hole 154 for spraying saturated steam; the telescopic mechanism 160 is connected to the steam box 130, and the telescopic mechanism 160 is used to drive the steam box 130 to move in the vertical direction; the scanning frame 200 is provided with a moisture sensor for detecting the moisture value of the leaf base; the pressure regulating unit 120 is arranged on the conveying pipe 110, and the pressure regulating unit 120 can adjust the pressure of the saturated steam based on the moisture value of the leaf base.

[0046] The above-mentioned reconstituted tobacco leaf base heating control system detects the moisture value of the sheet base through a scanning frame, determines the corresponding saturated steam pressure based on the moisture value, and adjusts the pressure of the saturated steam delivered to the steam box 130 by the delivery pipe 110 through the pressure regulating unit 120. It can be understood that the temperature and pressure of the saturated steam are corresponding. When the pressure changes, the temperature of the saturated steam changes accordingly, so that the temperature and moisture of the sheet base surface are accurately controlled. As the temperature of the sheet base rises, the viscosity and surface tension of the contained water decrease, the fluidity is enhanced, and the dehydration resistance is reduced, so that a better dehydration effect can be obtained in the next process area such as the pressing area. Due to the different thicknesses and water contents of different sheet bases, the heat absorption is different. Therefore, according to the moisture distribution on the surface of the sheet base, the steam box 130 can be driven to move through the telescopic mechanism 160 to adjust the height of the steam box 130, that is, adjust the distance between the steam box 130 and the sheet base in the vertical direction, so that the steam is evenly distributed above the entire sheet base to ensure that the sheet base obtains the best heating effect. In the process of being drawn away, the steam reaches heat exchange due to passing through the wet sheet base, thereby increasing the temperature. At the same time, according to the difference in moisture content of different sheet bases, the pressure of saturated steam can be adjusted through the pressure regulating unit 120 to control the temperature of saturated steam, so as to achieve precise control of the temperature and moisture of the sheet base of reconstituted tobacco, thereby improving the quality and uniformity of the reconstituted tobacco leaves. Improving the uniformity of sheet base moisture helps reduce production failures such as breakage and wrinkles, thereby reducing production costs.

[0047] In addition, by adjusting the height position of the steam box 130 through the telescopic mechanism 160, it can also adapt to substrates of different thicknesses, so that the steam box 130 and the substrate maintain an optimal vertical distance, so that the steam is evenly distributed above the entire substrate to ensure that the substrate obtains the best heating effect. It can be understood that the substrate is carried on the forming net, so when the forming net needs to be replaced, the steam box 130 can also be lifted to the highest position through the telescopic machine to facilitate the replacement operation of the forming net. It can be understood that a soft connection is used between the steam box 130 and the conveying pipe 110, so that the conveying pipe 110 can adapt to the position change of the steam box 130 and ensure the reliability of the connection between the two.

[0048] It can be understood that the steam box 130 is provided with a plurality of heating units 150 distributed at intervals, for example, Figure 3 In the perspective shown, multiple heating units 150 are evenly arranged, and steam is sprayed from different positions by multiple heating units 150 to ensure that the steam is evenly sprayed on the surface of the substrate. The steam box 130 is used to form a sealed area to increase the efficiency of steam heating. In some embodiments, the moisture on the surface of the substrate is detected by a scanning frame, so that local heating can be performed according to the moisture distribution, thereby accurately controlling the steam pressure and temperature to improve the moisture range of the substrate.

[0049] In one embodiment, the reconstituted tobacco leaf base heating control system further includes a control unit in communication with the pressure regulating unit 120, and the control unit is used to issue a control instruction to the pressure regulating unit 120 to adjust the pressure of the saturated steam through the pressure regulating unit 120. The control unit can be integrated in the control cabinet, so that the entire reconstituted tobacco leaf base heating control system is more automated and intelligent.

[0050] In one embodiment, the scanning frame is connected to the control unit in communication so as to transmit the moisture value to the control unit. That is, the control unit can automatically receive the moisture information transmitted by the scanning frame. In some embodiments, a steam moisture-pressure curve or a steam moisture-temperature curve is integrated in the control unit, and the horizontal coordinate of the curve can be the moisture value, and the vertical coordinate can be the steam pressure value or the steam temperature value. After the scanning frame detects the moisture value of the substrate, the moisture value is transmitted to the control unit, and the control unit can determine the steam pressure value corresponding to the moisture value according to the steam moisture-pressure curve or the steam moisture-temperature curve, thereby sending a control instruction to the pressure regulating unit 120, and adjusting the pressure of the saturated steam through the pressure regulating unit 120.

[0051] In other embodiments, after the moisture value of the substrate is detected by the scanning frame, the pressure regulating unit 120 can be manually controlled to operate according to the steam pressure corresponding to the moisture value, thereby adjusting the steam pressure and further adjusting the steam temperature.

[0052] In one embodiment, the pressure regulating unit 120 includes a pressure regulating valve in communication with the control unit, and the control unit adjusts the opening of the pressure regulating valve by receiving the moisture value output by the scanning frame, thereby changing the steam flow entering the steam box 130, and realizing accurate control of the steam temperature and pressure in the steam box 130. When the moisture value is greater than the moisture setting value, the opening of the pressure regulating valve is increased, so that the pressure of the saturated steam is increased, and correspondingly, the temperature of the saturated steam is increased; when the moisture value is less than the setting value, the opening of the pressure regulating valve is reduced, so that the pressure of the saturated steam is reduced, and correspondingly, the temperature of the saturated steam is reduced.

[0053] In one embodiment, the pressure regulating unit 120 further includes a servo mechanism, which is connected to the pressure regulating valve, and is used to receive a control instruction from the control unit to adjust the opening of the pressure regulating valve. In some embodiments, the servo mechanism can be a servo motor, which drives the pressure regulating valve to operate to accurately control the steam flow. In other embodiments, the pressure regulating unit 120 can also be a pressure regulating pump, which changes the steam pressure by changing the amount of steam pumped in.

[0054] In some embodiments, the pressure regulating unit 120 may further include at least one of a pressure reducing valve, a safety valve, and a steam trap. By providing a pressure reducing valve, high-pressure steam can be reduced to a lower pressure suitable for use. By providing a safety valve, when the pressure in the system exceeds the set safety threshold, the safety valve will automatically open to release excess steam or other media to prevent the system from exploding or being damaged due to over-pressurization. By providing a steam trap, condensed water generated in the delivery pipe 110 can be automatically discharged while preventing steam leakage, which helps to improve the thermal efficiency of the system and prevent corrosion problems caused by water accumulation.

[0055] In some embodiments, the reconstituted tobacco leaf base heating control system also includes a pressure detection component that is communicatively connected to the control unit for detecting the steam pressure in real time. In some embodiments, the pressure detection component can be a pressure sensor, which converts the detected pressure signal into an electrical signal and transmits it to the control unit. The control unit (such as a PLC or a dedicated controller) receives the feedback signal from the pressure sensor and compares it with the target pressure value to be adjusted. If the current pressure is lower than the target pressure value, the control unit sends an instruction to the pressure regulating unit 120, such as a pressure regulating valve, to increase the steam flow rate; if it is higher than the target pressure value, the steam flow rate is reduced. The steam pressure is continuously monitored by the pressure detection component, and the action of the pressure regulating unit 120 is controlled according to the feedback to form a closed-loop control system to ensure that the steam pressure is stable within the set range and improve the precision control of the steam pressure.

[0056] In one embodiment, the reconstituted tobacco leaf base heating control system further comprises a control panel for parameter display and / or parameter setting, so as to facilitate the operator to set and monitor the parameters, for example, the operator can set the required steam pressure value through the control panel. In some embodiments, the control panel can be a touch screen, allowing the user to directly interact with the system through icons and menus on the touch screen.

[0057] See also Figures 1 to 4As shown, in one embodiment, the telescopic mechanism 160 includes a rotary drive member, a drive rod and a drive block threadedly connected to the drive rod, and the drive block is connected to the steam box 130; the drive rod is connected to the rotary drive member and is driven by the rotary drive member to rotate so that the drive block drives the steam box 130 to move in the vertical direction. In some embodiments, the telescopic mechanism 160 also includes a guide rail extending in the vertical direction to guide the motion path of the drive block to ensure that the drive block maintains linear motion without deflection during the movement. In some embodiments, limit switches are provided at both ends of the guide rail to prevent the drive block from exceeding its predetermined working range and protect the device from damage. In some embodiments, the rotary drive member can be a stepper motor, a servo motor, etc., the drive rod is a screw rod, and the drive block is a nut. When the screw rod rotates, the nut will move linearly along the screw rod, driving the steam box 130 to move synchronously, that is, the telescopic mechanism 160 is a screw rod mechanism, and the screw rod mechanism can provide a more stable lifting function, more accurately control the lifting position, and ensure control accuracy.

[0058] See also Figure 6 As shown, in one embodiment, the heating unit 150 includes a swirl section 151, a contraction section 152 and an atomizing injection section 153, the swirl section 151 is used to buffer the saturated steam; along the vertical direction, and in the direction from the swirl section 151 to the atomizing injection section 153, the flow area of ​​the contraction section 152 gradually decreases; the atomizing injection section 153 is configured with a steam injection hole 154. After the fluid enters the swirl section 151, it forms a rotational motion under the action of centrifugal force. This rotational motion increases the shear force between the steam, further breaks up the droplets, and makes them more subtle. At the same time, the rotation also promotes the uniform distribution of steam in space. The saturated steam is compressed by the contraction section 152 and ejected from the steam injection hole 154 of the atomizing injection section 153. When the steam passes through the contraction section 152, due to the reduction of the cross-sectional area, according to the continuity equation (mass conservation), the flow rate will increase. This helps to increase the kinetic energy of the steam, thereby transferring heat more efficiently. At the same time, the design of the contraction section 152 can help remove condensate and prevent it from accumulating in the pipe, affecting the heat transfer efficiency and even causing corrosion problems. The fast-flowing steam can carry away the condensate and reduce the possibility of water accumulation.

[0059] Figure 5 This is a schematic diagram of an atomization tube 140 in a reconstituted tobacco leaf base heating control system provided in an embodiment of the present application. Figure 5As shown, in one embodiment, the reconstituted tobacco leaf base heating control system further includes an atomizing tube 140, one end of which is connected to the conveying pipe 110, and the other end of which is connected to the swirl section 151. The saturated steam is atomized by the atomizing tube 140, which reduces the airflow impulse, while ensuring the heating temperature and avoiding damage to the leaf base surface. In some embodiments, the atomizing tube 140 is a venturi tube, which is a device designed based on the Bernoulli principle and is used to accelerate fluid flow and reduce pressure, thereby achieving efficient atomization.

[0060] See also Figure 1 As shown, in one embodiment, the reconstituted tobacco leaf base heating control system further includes a waste heat recovery pipe 170, and the waste heat recovery pipe 170 is connected to one end of the steam box 130 away from the pressure regulating unit 120. The other end of the waste heat recovery pipe 170 can be connected to the steam recycling system of the paper machine, such as the steam recycling system of the large cylinder and the group cylinder, so that the waste heat can be recycled and utilized, thereby improving the energy utilization rate.

[0061] See also Figure 1 As shown, in one embodiment, the steam box 130 is provided with a drain port 180 for draining condensed water. In this way, the condensed water generated in the steam box 130 can be drained through the drain port 180.

[0062] In one embodiment, the air supply unit is a connecting gas cabinet, which is used to provide a compressed air power source; the reconstituted tobacco leaf base heating control system also includes a purge bellows connected to the connecting gas cabinet; the purge bellows is used to purge the steam box 130. The connecting gas cabinet provides a power source for the delivery pipe 110 and the purge bellows. When the forming net is replaced or the machine is shut down for maintenance, the steam box 130 is purged through the purge bellows to ensure that the inside of the steam box 130 is clean and free of residue. In some embodiments, a switch valve 190 is provided on the gas pipeline between the connecting gas cabinet and the delivery pipe 110, and the conduction or disconnection of the gas pipeline is controlled by the switch valve.

[0063] In some embodiments, the angle and opening size of the air outlet of the purge bellows are adjustable so as to adjust the airflow direction and intensity according to actual needs. In some embodiments, a guide plate or baffle is provided inside the purge bellows to guide the airflow direction, reduce turbulence, and improve the uniformity of airflow distribution.

[0064] In some embodiments, the steam box 130 is installed at the front end of the pressing area. Before the reconstituted tobacco leaf base enters the pressing area, it is first subjected to the saturated steam sprayed by the heating unit 150, so that the surface temperature and moisture of the leaf base are precisely controlled. As the temperature of the reconstituted tobacco leaf rises, the viscosity and surface tension of the moisture contained in it decrease, and the fluidity increases. Due to the decrease in the viscosity and surface tension of the water, the dehydration resistance of the pressing area located behind the steam box 130 is reduced, thereby obtaining a better dehydration effect in the pressing area.

[0065] like Figure 7 and Figure 8 As shown, in some embodiments, the scanning frame 200 includes a scanning head 210, a scanning mechanism and a signal processing unit. The scanning mechanism is used to drive the scanning head 210 to move along the width direction of the substrate 1000. The width direction of the substrate 1000 is indicated by arrow Y in the figure. The scanning head 210 is provided with a sensor module, and the sensor module may include a moisture sensor for detecting the moisture of the substrate 1000. In some embodiments, the moisture sensor may adopt near-infrared spectroscopy or microwave technology. Taking near-infrared spectroscopy as an example, water molecules have absorption characteristics for near-infrared light of a specific wavelength. The sensor emits near-infrared light of a specific wavelength, and then measures the intensity change of the reflected or transmitted light, and calculates the moisture content by analyzing the change in light intensity. Since the moisture sensor and the substrate 1000 are non-contact measurements, it will not affect the substrate 1000, thereby improving the detection accuracy. The signal processing unit converts the signal collected by the sensor module into readable data, analyzes and processes it, and feeds back the detection results to the control unit.

[0066] In some embodiments, the scanning frame 200 can also be used to detect the quantity of the substrate 1000. Correspondingly, the aforementioned sensor module can include a quantitative sensor for detecting the quantity of the substrate 1000, that is, measuring the mass of the substance per unit area. In some embodiments, the quantitative sensor can be based on the principle of β-ray absorption or the principle of X-rays. Taking the principle of β-ray absorption as an example, when β-rays pass through the substrate 1000, they will be partially absorbed, and the amount absorbed is proportional to the mass of the substrate 1000. By measuring the attenuation degree of the β-rays, the quantity of the substrate 1000 can be calculated.

[0067] In some embodiments, the sensor module on the scanning frame 200 moves back and forth along the width direction (lateral direction) of the substrate 1000, that is, the Y direction, and collects the moisture and quantitative data of the substrate 1000 point by point. Each scan covers the entire width of the substrate 1000 to ensure comprehensive detection. The original signal collected by the sensor is converted into specific values ​​of moisture and quantitative through the signal processing unit. Then, the distribution diagram of moisture and quantitative is generated by the data processing software to show the changes in the substrate 1000 in the lateral and longitudinal directions. According to the test results, the control system automatically adjusts the production process parameters. For example, if the moisture is too high, the moisture can be reduced by increasing the steam pressure or increasing the steam flow. If the quantitative is uneven, it can be improved by adjusting the slurry concentration.

[0068] like Figure 7 and Figure 8 As shown, in some embodiments, since the scanning head of the scanning frame 200 reciprocates along the Y direction, and the substrate 1000 moves along the production process, that is, the substrate 1000 moves along the X direction in the figure, the detection track of the scanning frame 200 is as shown in FIG. Figure 8 As shown, it is Z-shaped, so the signal of the scanning head can be decomposed horizontally and vertically to obtain the actual horizontal moisture distribution data and quantitative distribution data of the substrate 1000 to improve the accuracy of control.

[0069] like Figure 7 and Figure 8 As shown, in some embodiments, the control system further includes a headbox dilution water actuator 300, and the headbox dilution water actuator 300 includes a dilution water valve 310 that is communicatively connected to the control unit. By controlling the opening of the dilution water valve 310, the amount of dilution water added is adjusted, and the quantitative of the substrate 1000 can be adjusted so that the quantitative of the substrate 1000 reaches the set value. For example, when the scanning frame 200 detects that the quantitative of a local area of ​​the substrate 1000 in the horizontal direction is lower than the set value, a signal is transmitted to the control unit, and the control unit controls the opening of the dilution water valve 310 of the headbox dilution water actuator 300, so that the slurry concentration in the local area can be increased, that is, the amount of dilution water added can be reduced; when the quantitative of a local area of ​​the substrate 1000 in the horizontal direction is higher than the set value, the slurry concentration can be reduced, that is, the amount of dilution water added can be increased, and the quantitative of the substrate 1000 is adjusted by the headbox dilution water actuator 300, so that the quantitative distribution of the substrate 1000 is relatively uniform, and the horizontal alignment with the detection data of the scanning frame 200 is achieved.

[0070] like Figure 7 and Figure 8As shown, in this embodiment, a steam box 130 is also briefly illustrated. Steam is sprayed toward the substrate 1000 through the steam injection holes 154 of the steam box 130 above the substrate 1000, and the vacuum box below the substrate 1000 extracts the steam, so that the steam penetrates the paper web, achieves heat exchange, and increases the temperature of the substrate 1000. As the temperature of the substrate 1000 increases, the viscosity and surface tension of the water decrease, and the fluidity increases, so that the dehydration effect of the substrate 1000 when passing through the pressing area is improved. In other words, the steam box 130 can first soften the paper web. By steam penetrating the fibers, high-pressure steam is vertically injected onto the surface of the paper web through the steam injection holes 154, and the steam penetrates the pores of the paper sheet to directly heat the fiber network. The heat transfer in the steam temporarily breaks the hydrogen bonds of the fibers, softens the amorphous region of cellulose, reduces the glass transition temperature of the fibers, makes the fibers more flexible, and rearranges the fibers to reduce the drying shrinkage stress, thereby reducing the brittle cracking of the paper web caused by the drying stress. Rapidly increase the temperature of the substrate 1000, accelerate the migration of the internal moisture of the substrate 1000 to the surface, and reduce the energy consumption of subsequent drying cylinders. Secondly, the steam box 130 can also improve the uniformity of the transverse moisture of the substrate 1000. By adjusting the distribution of the steam injection holes 154, the transverse moisture deviation of the paper web is compensated to improve the quality of the finished paper. Through the partition design of the steam box 130, the steam flow or pressure is adjusted to compensate for the transverse moisture fluctuation of the paper web (such as fast drying at the edge and high moisture in the middle). After the steam injection, part of the condensed water is absorbed by the paper web, and it is discharged in time with the vacuum box and the condensed water drainage hole to avoid secondary wetting of the substrate 1000.

[0071] Through the cooperation of the scanning frame 200, the headbox dilution water actuator 300, and the steam box 130, the moisture content and the basis weight of the film base 1000 are controlled in the transverse partition, the uniformity of the transverse moisture control of the film base 1000 is improved, and thus the transverse quality of the film base 1000 is improved.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A reconstituted tobacco leaf base heating control system, characterized in that: The reconstituted tobacco leaf base heating control system comprises: A delivery pipe (110), one end of the delivery pipe (110) being used for connecting to a gas supply unit; A steam box (130) is connected to the other end of the delivery pipe (110); a plurality of heating units (150) are arranged in the steam box (130), and each of the heating units (150) is configured with a steam injection hole (154) for injecting saturated steam; a telescopic mechanism (160), the telescopic mechanism (160) being connected to the steam box (130), and the telescopic mechanism (160) being used to drive the steam box (130) to move in a vertical direction; A scanning frame (200), wherein the scanning frame (200) is provided with a moisture sensor for detecting the moisture value of a film base; A pressure regulating unit (120) is arranged on the conveying pipe (110), and the pressure regulating unit (120) is used to adjust the pressure of saturated steam based on the moisture value of the substrate.

2. The reconstituted tobacco leaf base heating control system according to claim 1, characterized in that: The reconstituted tobacco leaf base heating control system further comprises a control unit which is in communication with the pressure regulating unit (120), and the control unit is used to issue a control instruction to the pressure regulating unit (120) so as to adjust the pressure of saturated steam through the pressure regulating unit (120).

3. The reconstituted tobacco leaf base heating control system according to claim 2, characterized in that: The scanning frame is communicatively connected with the control unit to transmit the moisture value to the control unit.

4. The reconstituted tobacco leaf base heating control system according to claim 3, characterized in that: The pressure regulating unit (120) comprises a pressure regulating valve which is in communication connection with the control unit, and the control unit adjusts the opening of the pressure regulating valve by receiving the moisture value output by the scanning frame; When the moisture value is greater than the set moisture value, the opening of the pressure regulating valve is increased; when the moisture value is less than the set value, the opening of the pressure regulating valve is reduced.

5. The reconstituted tobacco leaf base heating control system according to claim 4, characterized in that: The pressure regulating unit (120) further comprises a servo mechanism, which is connected to the pressure regulating valve and is used to receive a control instruction issued by the control unit to adjust the opening of the pressure regulating valve.

6. The reconstituted tobacco leaf base heating control system according to claim 1, characterized in that: The reconstituted tobacco leaf base heating control system further comprises a control panel for parameter display and / or parameter setting; And / or, the scanning frame (200) comprises a scanning head and a scanning mechanism, the scanning mechanism is used to drive the scanning head to move along the width direction of the film base (1000); the scanning head is provided with the moisture sensor; And / or, the scanning frame (200) is further provided with a quantitative sensor for detecting the quantitative amount of the sheet base (1000), and the reconstituted tobacco sheet base (1000) heating control system further includes a headbox dilution water actuator (300), and the headbox dilution water actuator (300) includes a dilution water valve (310), and the amount of dilution water added is adjusted by controlling the opening of the dilution water valve (310).

7. The reconstituted tobacco leaf base heating control system according to claim 1, characterized in that: The telescopic mechanism (160) comprises a rotary drive member, a drive rod and a drive block threadedly connected to the drive rod, and the drive block is connected to the steam box (130); The driving rod is connected to the rotating driving member and is driven to rotate by the rotating driving member, so that the driving block drives the steam box (130) to move along the vertical direction.

8. The reconstituted tobacco leaf base heating control system according to claim 1, characterized in that: The heating unit (150) comprises a swirl section (151), a contraction section (152) and an atomization spray section (153), wherein the swirl section (151) is used to buffer saturated steam; Along the vertical direction and in the direction from the swirl section (151) to the atomizing spray section (153), the flow area of ​​the contraction section (152) gradually decreases; The atomizing spray section (153) is configured with the steam spray hole (154).

9. The reconstituted tobacco leaf base heating control system according to claim 8, characterized in that: The reconstituted tobacco leaf base heating control system further comprises an atomizing pipe (140), one end of the atomizing pipe (140) is connected to the conveying pipe (110), and the other end of the atomizing pipe (140) is connected to the swirl section (151).

10. The reconstituted tobacco leaf base heating control system according to claim 1, characterized in that: The reconstituted tobacco leaf base heating control system further comprises a waste heat recovery pipe (170), wherein the waste heat recovery pipe (170) is connected to an end of the steam box (130) away from the pressure regulating unit (120); and / or, the steam box (130) is provided with a drain port (180) for draining condensed water; And / or, the air supply unit is a connected gas cabinet, which is used to provide a compressed air power source; the reconstituted tobacco leaf base heating control system also includes a purge bellows connected to the connected gas cabinet; the purge bellows is used to purge the steam box (130).

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