Temperature detection based online adjusting type air distribution device of dryer

Abstract

The present application relates to the technical field of drying machine, and discloses an online adjusting type air distribution device of drying machine based on temperature detection, which comprises air chambers symmetrically arranged on both sides of the drying machine and communicated with the inside of the drying machine, a centrifugal fan connected to the air inlet end of an air inlet pipeline, and a first branch pipeline and a second branch pipeline communicated through a shunt node and connected to the left and right air chambers respectively. A air distribution plate with a size matched with the internal flow area of the air inlet pipeline is vertically arranged at the shunt node, and a rotating shaft matched with the side wall of the pipeline is arranged at the center of the air distribution plate, and the rotating shaft is driven by a driver outside the pipeline to drive the air distribution plate to rotate. Temperature sensors are installed at the air inlets of the left and right air chambers, and the controller calculates the temperature difference between the two temperature detection values and drives the air distribution plate to rotate by a preset angle unit to online adjust the hot air distribution ratio of the two branch pipelines. The present application realizes dynamic online adjustment of hot air distribution through the rotatable air distribution plate combined with the closed-loop temperature regulation system, and ensures the uniformity of the temperature field inside the drying machine.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, and more specifically to an online adjustable air distribution device for a dryer based on temperature detection. Background Technology

[0002] With the development of large-scale industrial production, the single-unit processing capacity of dryers is constantly improving. In order to solve the problem of hot air attenuation during long-distance dryer delivery, the industry generally adopts a double-sided symmetrical air inlet structure, that is, independent air chambers are set on both sides of the dryer, and hot air is delivered to both air chambers simultaneously through parallel pipes. This structure can effectively shorten the hot air delivery distance and reduce friction loss along the way.

[0003] The existing dual-side air intake and distribution system mainly uses fixed-size diversion pipes for hot air distribution, and achieves fixed air volume distribution by pre-calculating the pipe cross-sectional area ratio.

[0004] However, in actual industrial production, the operating conditions of the drying system are always in a state of dynamic change: fluctuations in the air pressure of the centrifugal fan, fluctuations in the combustion temperature of the hot air furnace, changes in resistance caused by ash accumulation on the inner wall of the pipe, and differences in the material loading can all disrupt the original air volume balance between the two air chambers, thereby causing differences in the inlet air temperature. Summary of the Invention

[0005] The purpose of this invention is to provide an online adjustable air distribution device for a dryer based on temperature detection, so as to solve the technical problem in the prior art where uneven air volume distribution in the air chambers on both sides of the dryer leads to inconsistent heat exchange of hot air, which in turn causes differences in the inlet air temperature.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] An online adjustable air distribution device for a dryer based on temperature detection includes: air chambers, one on each side of the dryer, the air chambers communicating with the interior of the dryer for receiving hot air and delivering the hot air into the dryer; an air inlet duct, the air inlet end of which is sealed to the air outlet of a centrifugal fan, and the air outlet end of which is branched to a first branch duct and a second branch duct, the air outlet end of the first branch duct being sealed to the air inlet of the left air chamber, and the air outlet end of the second branch duct being sealed to the air inlet of the right air chamber; an air distribution plate, vertically disposed at the branching node of the air inlet duct and the first and second branch ducts; a rotating shaft fixedly inserted through the center of the air distribution plate, the two ends of the rotating shaft being rotatably engaged with the side walls of the air inlet duct, and the size of the air distribution plate being adapted to the internal flow area of ​​the air inlet duct; and a driver, fixedly installed on the outer side wall of the air inlet duct, the output end of which is connected to the rotating shaft. One end is coaxially connected, allowing the air distribution plate to rotate around the shaft to change the angle between the air distribution plate and the axis of the air inlet duct, thereby changing the effective flow area ratio of the air inlet ends of the first and second ducts respectively blocked by the air distribution plate; two temperature sensors are provided, respectively located at the air inlets of the air chambers on both sides; a controller is electrically connected to the driver and the temperature sensors respectively, and the controller has a preset allowable temperature difference threshold and a single angle unit adjustment value; the controller is configured to: acquire the detection values ​​of the two temperature sensors in real time and calculate the temperature difference; when the temperature difference is greater than the preset allowable temperature difference threshold, drive the shaft through the driver to rotate the air distribution plate according to the positive or negative direction of the temperature difference, thereby adjusting the hot air distribution ratio of the first and second ducts online until the air inlet temperature difference of the two air chambers is less than or equal to the allowable temperature difference threshold.

[0008] According to one embodiment of the present invention, the rotating shaft divides the air distribution plate into a first region and a second region. The first region is disposed facing the air inlet end of the first branch pipe and correspondingly blocks the air inlet end face of the first branch pipe. The second region is disposed facing the air inlet end of the second branch pipe and correspondingly blocks the air inlet end face of the second branch pipe. A plurality of evenly distributed air inlet holes are respectively provided on the first region and the second region.

[0009] According to one embodiment of the present invention, the length of the first branch pipe is greater than the length of the second branch pipe, and the total flow area of ​​the air inlet holes in the first region is greater than the total flow area of ​​the air inlet holes in the second region.

[0010] According to one embodiment of the present invention, the rotation angle range of the air distribution plate around the rotating axis is -45° to +45°, wherein the 0° position is the initial equilibrium position where the air distribution plate is perpendicular to the axis of the air inlet duct; the controller is further configured to: drive the air distribution plate to rotate towards the second branch duct when the temperature of the left air chamber is lower than the temperature of the right air chamber and the temperature difference is greater than the allowable temperature difference threshold, and drive the air distribution plate to rotate towards the first branch duct when the temperature of the right air chamber is lower than the temperature of the left air chamber and the temperature difference is greater than the allowable temperature difference threshold.

[0011] According to one embodiment of the present invention, mounting holes and through holes are respectively provided on opposite sides of the air inlet duct, one end of the rotating shaft is rotatably engaged with the mounting hole, and the other end passes through the through hole and is connected to the output end of the driver.

[0012] According to one embodiment of the present invention, a strip rod is fixedly sleeved at one end of the rotating shaft that passes through the through hole. The strip rod extends radially outward from the outer wall of the rotating shaft along the air inlet duct. A positioning post is fixedly provided at the free end of the strip rod. A semi-circular plate is fixed on the outer wall of the air inlet duct. An arc-shaped groove is provided on the semi-circular plate for the positioning post to slide through. The positioning post can slide back and forth along the arc-shaped groove.

[0013] According to one embodiment of the present invention, the rotation axis of the bar coincides with the central axis of the semicircular plate.

[0014] According to one embodiment of the present invention, the arcuate outer edge of the semicircular plate is provided with an angle scale line along its arc length direction, and an indicator arrow is fixed on the positioning post, the indicator arrow pointing to the angle scale line to indicate the rotation angle of the air distribution plate.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This invention solves the core problem of uneven air inlet temperature in traditional dryers by setting a rotatable air distribution plate at the flow splitting node between the air inlet duct and the first and second branch ducts, combined with online detection and closed-loop adjustment by temperature sensors and controllers. It can adjust the hot air distribution ratio in real time according to the actual temperature difference between the two air chambers, ensuring the uniformity of the internal temperature field of the dryer. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 A structural cross-sectional view of an online adjustable air distribution device for a dryer based on temperature detection, provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of the air distribution plate adjustment of an online adjustable air distribution device for a dryer based on temperature detection, provided in an embodiment of this application. Figure 1 ;

[0020] Figure 3 A schematic diagram of the air distribution plate adjustment of an online adjustable air distribution device for a dryer based on temperature detection, provided in an embodiment of this application. Figure 2 ;

[0021] Figure 4 A front view of an online adjustable air distribution device for a dryer based on temperature detection, provided in an embodiment of this application;

[0022] Figure 5 for Figure 4 Enlarged view of part A in the middle

[0023] Figure 6 A schematic diagram of the air distribution plate structure of an online adjustable air distribution device for a dryer based on temperature detection, provided in an embodiment of this application;

[0024] Figure 7 This is a cross-sectional view of the air inlet duct of an online adjustable air distribution device for a dryer based on temperature detection, provided as an embodiment of this application.

[0025] The reference numerals in the figure are as follows:

[0026] 1. Ventilation chamber;

[0027] 2. Air inlet duct; 201. First branch duct; 202. Second branch duct; 203. Mounting hole; 204. Through hole;

[0028] 3. Air distribution panel; 301. Rotating shaft; 302. First zone; 303. Second zone; 304. Air inlet;

[0029] 4. Driver;

[0030] 5. Temperature sensor;

[0031] 6. Bar; 601. Positioning post; 602. Indicator arrow;

[0032] 7. Semicircular plate; 701. Arc-shaped groove; 702. Angle scale line. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] like Figure 1 and Figure 7 As shown, this application provides an online adjustable air distribution device for a dryer based on temperature detection, comprising: an air chamber 1, with one air chamber 1 on each side of the dryer, the air chamber 1 being connected to the interior of the dryer, for receiving hot air and conveying the hot air to the interior of the dryer.

[0035] The air inlet duct 2 has its inlet end sealed to the outlet of the centrifugal fan, and its outlet end is connected to a first branch duct 201 and a second branch duct 202. The outlet end of the first branch duct 201 is sealed to the inlet of the left air chamber 1, and the outlet end of the second branch duct 202 is sealed to the inlet of the right air chamber 1. The air inlet duct 2 has a rectangular cross-section.

[0036] The air distribution plate 3 is vertically installed at the branching node between the air inlet duct 2 and the first branch duct 201 and the second branch duct 202. The initial angle between the plane of the air distribution plate 3 and the axis of the air inlet duct 2 is 90°. The gap between the upper and lower edges of the air distribution plate 3 and the inner wall of the air inlet duct 2 is 2mm, and the gap between the left and right edges and the inner wall of the duct is 1.5mm. A rotating shaft 301 is fixedly inserted through the center of the air distribution plate 3. The two ends of the rotating shaft 301 are rotatably engaged with the side walls of the air inlet duct 2. The size of the air distribution plate 3 is adapted to the internal flow area of ​​the air inlet duct 2.

[0037] The driver 4 is fixedly installed on the outer wall of the air inlet duct 2. Its output end is coaxially connected to one end of the rotating shaft 301, allowing the air distribution plate 3 to rotate around the rotating shaft 301 to change the angle between the air distribution plate 3 and the axis of the air inlet duct 2, thereby changing the effective flow area ratio of the air distribution plate 3 blocking the air inlet ends of the first branch duct 201 and the second branch duct 202 on both sides. The driver 4 uses a stepper motor.

[0038] Temperature sensors 5 are provided in two units, one at each of the air inlets of the air chamber 1 on both sides. Temperature sensors 5 are PT100 platinum resistance thermometers, which are fixed to the side wall of the air inlet of the air chamber 1 by threads, with the probes extending into the air chamber 1 to make full contact with the hot air.

[0039] The controller is electrically connected to the driver 4 and the temperature sensor 5 respectively. The controller has preset allowable temperature difference thresholds and single-time angle unit adjustment values. The controller uses a PLC controller. The default allowable temperature difference threshold is set to 2℃, and the default single-time angle unit adjustment value is set to 5°. The controller is configured to: acquire the detection values ​​of the two temperature sensors 5 in real time and calculate the temperature difference; when the temperature difference exceeds the preset allowable temperature difference threshold, drive the rotating shaft 301 via the driver 4 to rotate the air distribution plate 3 according to the positive or negative direction of the temperature difference, thereby adjusting the hot air distribution ratio between the first duct 201 and the second duct 202 online until the inlet air temperature difference of the two air chambers 1 is less than or equal to the allowable temperature difference threshold. The controller's sampling period is 1 second. After each adjustment, there is a 5-second delay before re-detecting the temperature and calculating the difference to avoid system oscillation caused by frequent adjustments. When the temperature difference is detected to be less than or equal to the allowable threshold three times consecutively, the current angle of the air distribution plate 3 is locked.

[0040] By installing a rotatable air distribution plate 3 at the flow splitting node, combined with online detection and closed-loop adjustment of the temperature sensor 5 and the controller, the core problem of uneven air inlet temperature on both sides of the traditional dryer is solved. The hot air distribution ratio can be adjusted in real time according to the actual temperature difference between the two sides of the air chamber 1, ensuring the uniformity of the internal temperature field of the dryer.

[0041] However, in actual implementation, there is a potential technical problem that if the air distribution plate 3 completely blocks the air inlet of the branch pipe, the air chamber 1 on that side will be completely cut off from airflow. To solve this problem, the air distribution plate 3 is designed with specific optimization.

[0042] In this embodiment, the air distribution plate 3 is divided into a first region 302 and a second region 303 by a rotating shaft 301. The rotating shaft 301 passes through the vertical center line of the air distribution plate 3, dividing the air distribution plate 3 into two equal rectangular regions, left and right. The first region 302 is located on the left side of the rotating shaft 301, and the second region 303 is located on the right side of the rotating shaft 301. The dividing line between the two regions coincides with the axis of the rotating shaft 301. The first region 302 is positioned facing the air inlet end of the first branch pipe 201 and correspondingly blocks the air inlet end face of the first branch pipe 201. The second region 303 is positioned facing the air inlet end of the second branch pipe 202 and correspondingly blocks the air inlet end face of the second branch pipe 202. A plurality of evenly distributed air inlet holes 304 are respectively opened on the first region 302 and the second region 303.

[0043] By creating evenly distributed air inlets 304 in two areas of the air distribution plate 3, the problem of air interruption in the side air chamber 1 when the air distribution plate 3 completely blocks the branch pipe is solved. This ensures that hot air flows through both side air chambers 1 at all times, preventing sudden drops in local temperature inside the dryer from affecting drying quality. The system's operational stability is further improved based on the basic design.

[0044] The aforementioned optimization scheme has effectively solved the problem of air interruption when the air distribution plate 3 blocks the branch pipe. However, in actual implementation, there are still potential technical problems such as the greater resistance of hot air along the pipe due to the longer length of the first branch pipe 201 and the uneven air inlet pressure of the two side air chambers 1. In order to solve this problem, the air inlet hole 304 of the air distribution plate 3 is specifically optimized.

[0045] The length of the first branch pipe 201 is greater than that of the second branch pipe 202, and the total flow area of ​​the air inlets 304 in the first region 302 is greater than that of the air inlets 304 in the second region 303. The difference in friction resistance is calculated based on the actual lengths of the first and second branch pipes 201 and 202, determining the ratio of the total flow area of ​​the air inlets 304 in the first and second regions 303. When fabricating the air distribution plate 3, the corresponding number of air inlets 304 are fabricated in the two regions according to the calculation results. When hot air passes through the air distribution plate 3, the larger flow area in the first region 302 can compensate for the greater friction resistance of the first branch pipe 201, making the air inlet pressure in both air chambers 1 basically the same.

[0046] By making the total flow area of ​​the air inlet 304 in the first region 302 larger than that in the second region 303, the additional friction resistance caused by the longer length of the first branch pipe 201 is compensated. This solves the problem of uneven air inlet pressure in the two side air chambers 1 and further improves the uniformity of air inlet temperature on both sides.

[0047] In actual implementation, there is a potential technical problem that the excessive rotation angle of the air distribution plate 3 leads to over-adjustment of hot air distribution and poor system stability. To solve this problem, the rotation angle range of the air distribution plate 3 and the controller logic are specifically optimized.

[0048] The air distribution plate 3 rotates around the pivot 301 within a range of -45° to +45°, with the 0° position being the initial equilibrium position where the air distribution plate 3 is perpendicular to the axis of the air inlet duct 2. The controller is further configured to: drive the air distribution plate 3 to rotate towards the second branch duct 202 when the temperature of the left air chamber 1 is lower than that of the right air chamber 1 and the temperature difference exceeds the allowable temperature difference threshold; and drive the air distribution plate 3 to rotate towards the first branch duct 201 when the temperature of the right air chamber 1 is lower than that of the left air chamber 1 and the temperature difference exceeds the allowable temperature difference threshold. The controller internally stores a table corresponding to the rotation direction and the sign of the temperature difference. When the temperature on the left is lower than that on the right, the temperature difference is negative, and the air distribution plate 3 is driven to rotate in the +45° direction; conversely, it rotates in the -45° direction.

[0049] By limiting the rotation angle range of the air distribution plate 3 and optimizing the rotation direction logic of the controller, the problem of excessive hot air distribution adjustment caused by excessive rotation angle of the air distribution plate 3 was solved. This ensured the stability and safety of system operation and avoided drastic temperature fluctuations caused by over-adjustment. It further improved the reliability of online adjustment.

[0050] Further optimization design was carried out on the installation structure of the air inlet duct 2 and the rotating shaft 301. Mounting holes 203 and through holes 204 are respectively opened on opposite sides inside the air inlet duct 2. One end of the rotating shaft 301 is rotatably engaged with the mounting hole 203, and the other end passes through the through hole 204 and connects to the output end of the driver 4.

[0051] Coaxial mounting holes 203 and through holes 204 are machined on opposite sides of the air inlet duct 2, and deep groove ball bearings are pressed into the mounting holes 203. One end of the rotating shaft 301 is inserted into the bearing in the mounting hole 203, and the other end passes through the through hole 204 and is fitted with a skeleton oil seal. Finally, the output end of the driver 4 is coaxially connected to the through end of the rotating shaft 301 via a coupling, completing the installation and positioning of the rotating shaft 301. By opening coaxial mounting holes 203 and through holes 204 on the air inlet duct 2 and adopting an installation structure that combines bearings and oil seals, the problems of difficult installation and positioning of the rotating shaft 301 and poor coaxiality are solved. This ensures the smooth rotation of the rotating shaft 301 and reduces frictional resistance and noise during rotation. At the same time, the skeleton oil seal effectively prevents hot air leakage and improves the thermal efficiency of the system.

[0052] In actual implementation, there are still potential technical problems such as the inability to visually observe the rotation angle of the air distribution plate 3 and the difficulty in debugging. To solve this problem, targeted optimization design was carried out on the protruding end of the rotating shaft 301 and the outer wall of the air inlet duct 2.

[0053] A strip rod 6 is fixedly fitted onto one end of the rotating shaft 301 that protrudes from the through hole 204. The strip rod 6 extends radially outward from the outer wall of the rotating shaft 301 along the air inlet duct 2. The extension direction of the strip rod 6 is perpendicular to the plane of the air distribution plate 3. When the air distribution plate 3 is in its initial equilibrium position, the strip rod 6 is horizontal and coincides with the horizontal center line of the air inlet duct 2. A positioning post 601 is fixedly installed at the free end of the strip rod 6. The positioning post 601 is cylindrical and is fixedly connected to the free end of the strip rod 6 by welding. The axis of the positioning post 601 is parallel to the axis of the rotating shaft 301. A semi-circular plate 7 is fixed to the outer wall of the air inlet duct 2. The plane of the semi-circular plate 7 is perpendicular to the axis of the air inlet duct 2. An arc-shaped groove 701 is provided on the semi-circular plate 7 for the positioning post 601 to slide through. The center of the arc-shaped slide groove 701 coincides with the axis of the rotating shaft 301; the positioning post 601 can slide back and forth along the arc-shaped slide groove 701. A strip rod 6 and the positioning post 601 are fixedly installed at one end of the rotating shaft 301 that passes through the through hole 204. A semi-circular plate 7 is fixed at a corresponding position on the outer wall of the air inlet duct 2, so that the positioning post 601 enters the arc-shaped slide groove 701. When the air distribution plate 3 rotates, the rotating shaft 301 drives the strip rod 6 and the positioning post 601 to slide back and forth along the arc-shaped slide groove 701. The two ends of the arc-shaped slide groove 701 can serve as mechanical limits, restricting the rotation angle of the air distribution plate 3 within the range of -45° to +45°.

[0054] By incorporating the strip rod 6, positioning column 601, and semi-circular plate 7 with arc-shaped groove 701, the problem of the inability to visually observe and adjust the rotation angle of the air distributor 3 is solved. The arc-shaped groove 701 also serves as a mechanical limiter, further ensuring the accuracy and safety of the rotation angle of the air distributor 3. This provides convenience for the installation, commissioning, and daily maintenance of the equipment.

[0055] The rotation axis of the strip rod 6 coincides with the central axis of the semicircular plate 7. This solves the problem of the positioning post 601 getting stuck in the arc-shaped groove 701, ensuring the smooth rotation of the air distribution plate 3.

[0056] Furthermore, the semicircular plate 7 and the positioning post 601 are specifically optimized. An angle scale line 702 is provided along the arc length of the outer edge of the semicircular plate 7, with a graduation value of 1°. An indicator arrow 602 is fixed on the positioning post 601, pointing to the angle scale line 702 to indicate the rotation angle of the air distribution plate 3. When the air distribution plate 3 rotates, the indicator arrow 602 moves synchronously with the positioning post 601, and the scale value pointed to by the arrow tip is the current rotation angle of the air distribution plate 3.

[0057] By setting angle scale lines 702 on the semicircular plate 7 and indicator arrows 602 on the positioning column 601, the problem of inaccurate reading of the rotation angle of the air distribution plate 3 was solved. This significantly improves the accuracy and efficiency of equipment debugging, allowing operators to monitor the working status of the air distribution plate 3 in real time. It also provides an intuitive reference for the precise control of the system.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. All such modifications or substitutions should be covered within the protection scope of this application, and should not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An online adjustable air distribution device for a dryer based on temperature detection, characterized in that, include: Air chamber (1): An air chamber (1) is provided on each side of the dryer. The air chamber (1) is connected to the inside of the dryer and is used to receive hot air and deliver the hot air to the inside of the dryer. The air inlet duct (2) is sealed to the air outlet of the centrifugal fan. Its air outlet is connected to the first branch duct (201) and the second branch duct (202). The air outlet of the first branch duct (201) is sealed to the air inlet of the left air chamber (1), and the air outlet of the second branch duct (202) is sealed to the air inlet of the right air chamber (1). A distribution plate (3) is vertically installed at the branching node of the air inlet pipe (2) and the first branch pipe (201) and the second branch pipe (202); a rotating shaft (301) is fixedly installed through the center of the distribution plate (3), and the two ends of the rotating shaft (301) are rotatably engaged with the side walls of the air inlet pipe (2). The size of the distribution plate (3) is adapted to the internal flow area of ​​the air inlet pipe (2). The driver (4) is fixedly installed on the outer wall of the air inlet duct (2), and its output end is coaxially connected to one end of the rotating shaft (301), so that the air distribution plate (3) can rotate around the rotating shaft (301) to change the angle between the air distribution plate (3) and the axis of the air inlet duct (2), thereby changing the effective flow area ratio of the air inlet ends of the first branch duct (201) and the second branch duct (202) on both sides of the air distribution plate (3); Two temperature sensors (5) are provided, which are respectively installed at the air inlets of the air chambers (1) on both sides; The controller is electrically connected to the driver (4) and the temperature sensor (5) respectively. The controller has a preset allowable temperature difference threshold and a single angle unit adjustment value. The controller is configured to: acquire the detection values ​​of the two temperature sensors (5) in real time and calculate the temperature difference value. When the temperature difference value is greater than the preset allowable temperature difference threshold, drive the rotating shaft (301) through the driver (4) to drive the air distribution plate (3) to rotate according to the positive and negative directions of the temperature difference, and adjust the hot air distribution ratio of the first branch pipe (201) and the second branch pipe (202) online until the air inlet temperature difference of the two side air chambers (1) is less than or equal to the allowable temperature difference threshold.

2. The online adjustable air distribution device for a dryer based on temperature detection according to claim 1, characterized in that, The rotating shaft (301) divides the air distribution plate (3) into a first region (302) and a second region (303). The first region (302) is positioned facing the air inlet end of the first branch pipe (201) and correspondingly blocks the air inlet end face of the first branch pipe (201). The second region (303) is positioned facing the air inlet end of the second branch pipe (202) and correspondingly blocks the air inlet end face of the second branch pipe (202). Several evenly distributed air inlets (304) are respectively provided on the first region (302) and the second region (303).

3. The online adjustable air distribution device for a dryer based on temperature detection according to claim 2, characterized in that, The length of the first branch pipe (201) is greater than the length of the second branch pipe (202), and the total flow area of ​​the air inlet (304) of the first region (302) is greater than the total flow area of ​​the air inlet (304) of the second region (303).

4. The online adjustable air distribution device for a dryer based on temperature detection according to claim 3, characterized in that, The rotation angle range of the air distribution plate (3) around the rotating shaft (301) is -45° to +45°, where the 0° position is the initial equilibrium position where the air distribution plate (3) is perpendicular to the axis of the air inlet pipe (2); The controller is further configured to: drive the air distribution plate (3) to rotate toward the second branch pipe (202) when the temperature of the left air chamber (1) is lower than the temperature of the right air chamber (1) and the temperature difference is greater than the allowable temperature difference threshold; and drive the air distribution plate (3) to rotate toward the first branch pipe (201) when the temperature of the right air chamber (1) is lower than the temperature of the left air chamber (1) and the temperature difference is greater than the allowable temperature difference threshold.

5. The online adjustable air distribution device for a dryer based on temperature detection according to claim 1, characterized in that, The air inlet duct (2) has mounting holes (203) and through holes (204) on opposite sides. One end of the rotating shaft (301) is rotatably engaged with the mounting hole (203), and the other end passes through the through hole (204) and is connected to the output end of the driver (4).

6. The online adjustable air distribution device for a dryer based on temperature detection according to claim 5, characterized in that, A strip rod (6) is fixedly sleeved at one end of the rotating shaft (301) that passes through the through hole (204). The strip rod (6) extends radially outward from the outer wall of the rotating shaft (301) along the air inlet pipe (2). A positioning post (601) is fixedly installed at the free end of the strip rod (6). A semi-circular plate (7) is fixed on the outer wall of the air inlet pipe (2). An arc-shaped groove (701) is provided on the semi-circular plate (7) for the positioning post (601) to slide through. The positioning post (601) can slide back and forth along the arc-shaped groove (701).

7. The online adjustable air distribution device for a dryer based on temperature detection according to claim 6, characterized in that, The rotation axis of the bar (6) coincides with the central axis of the semicircular plate (7).

8. The online adjustable air distribution device for a dryer based on temperature detection according to claim 6, characterized in that, An angle scale line (702) is provided on the arc-shaped outer edge of the semicircular plate (7) along its arc length direction. An indicator arrow (602) is fixed on the positioning post (601). The indicator arrow (602) points to the angle scale line (702) to indicate the rotation angle of the air distribution plate (3).

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