Air inlet adjusting mechanism and tunnel type mushroom drying device comprising same

Abstract

The invention discloses an air inlet adjusting mechanism and a tunnel type mushroom drying device comprising the same, the air inlet adjusting mechanism comprises a rectangular fixed flow guide disc fixed at an air inlet and an upstream circular rotary adjusting disc, and the two discs are respectively provided with air distribution holes with vertical aperture gradient and horizontal density partition; the threaded rod drives the rotary adjusting disc to move axially so as to change the distance between the two discs, and meanwhile the planetary gear linkage unit is used for enabling the rotary adjusting disc to generate differential rotation. The invention belongs to the technical field of edible mushroom processing mechanical equipment, aims to solve the problems of low drying efficiency and non-uniform quality caused by non-uniform air intake of an existing drying device, and achieves the technical effects that through the linkage design, the vertical distribution intensity and the horizontal distribution proportion of air flow can be synchronously adjusted through single driving, and the drying efficiency is improved. The three-dimensional fine control on the air flow at the inlet of the drying box is realized; the mechanism can also integrate a Venturi sleeve and an internal linkage shuttle, so that the inlet airflow quality is further optimized.

Description

Technical Field

[0001] This invention relates to the field of edible fungi processing machinery and equipment, specifically to an air inlet regulating mechanism and a tunnel-type mushroom drying device containing the mechanism. Background Technology

[0002] Tunnel-type drying equipment is a key piece of equipment in the large-scale drying production of mushrooms. It continuously supplies high-temperature dry air to dehydrate mushrooms placed on multi-layer drying racks. The uniformity and efficiency of drying directly determine the quality grade and production cost of the finished mushroom product. In actual operation, the ideal drying process requires that the material in each layer and area of ​​the drying chamber be subjected to uniform hot air intensity to ensure that the entire batch of material reaches the target moisture content simultaneously, avoiding localized over-drying or under-drying.

[0003] However, existing equipment of this type often faces the significant problem of uneven airflow distribution. Hot air is typically delivered into the drying chamber from a single point or one side. Due to the natural upward movement of hot air, the airflow velocity and temperature in the upper space are often higher than those in the lower space. Simultaneously, due to limitations in the location and structure of the air inlet, the airflow often exhibits a distribution pattern of strong airflow in the center and weak airflow on both sides in the horizontal cross-section. This three-dimensional uneven airflow results in significant differences in the drying rate of mushrooms in different locations within the drying chamber. Operators often can only achieve rough control by adjusting the overall fan power or temperature, making it difficult to specifically compensate for local differences. The result is not only increased energy consumption and prolonged drying cycles, but more seriously, inconsistent product quality. Localized overheating can damage the shape and nutritional components of the mushrooms, while undried areas are prone to mold growth, causing economic losses. Therefore, to address the inadequacy of existing requirements, we propose an air intake regulating mechanism and a tunnel-type mushroom drying device incorporating this mechanism. Summary of the Invention

[0004] To address these issues, the present invention provides an air intake regulating mechanism and a tunnel-type mushroom drying device incorporating the mechanism.

[0005] To achieve the above objectives, the present invention provides the following technical solution: According to a first aspect of the present invention, an air inlet regulating mechanism includes a drying chamber and an air inlet pipe communicating with the air inlet of the drying chamber. The air inlet pipe is connected to the air inlet via a diffuser hood. The diffuser hood includes an extension box and a Venturi sleeve. The extension box has a circular channel, and the circular channel has a two-stage air distribution and linkage regulating assembly for three-dimensional distribution and regulation of the airflow entering the drying chamber. The two-stage air distribution and linkage regulating assembly includes: A rectangular fixed guide plate is fixedly installed at the air inlet. Its plate surface is divided into at least two strip-shaped areas along the height direction, and each area is provided with airflow holes of different diameters. A circular rotating adjustment disk is coaxially located upstream of the fixed guide disk, and its surface is divided into at least two sectors, each sector being provided with airflow holes of different densities. The axial moving unit includes an axially extending threaded rod, a connecting sleeve that is threadedly engaged with the threaded rod and fixed to the center of the fixed guide plate, and a moving frame that is driven by the threaded rod to move axially along the circular channel. The rotating adjusting plate is rotatably mounted on the moving frame and moves axially synchronously with it to adjust the distance between it and the fixed guide plate. A linkage unit is connected between the threaded rod and the rotary adjustment disk, so that when the threaded rod rotates and drives the moving frame to move axially, it can synchronously drive the rotary adjustment disk to rotate differentially around its axis. A drive unit is used to drive the threaded rod to rotate.

[0006] Furthermore, the surface of the fixed guide plate is divided into three strip-shaped areas along the height direction: upper, middle, and lower. The circular holes arranged in each strip-shaped area are evenly distributed in an equilateral triangle array, and the diameter of the circular holes decreases from bottom to top.

[0007] Furthermore, the surface of the rotating adjustment disk is divided into three equal-area sector regions by three rays originating from the center and forming an angle of 120° with each other. The diameter of the circular holes in all sector regions is the same, but the hole density in the left and right sectors is higher than that in the middle sector.

[0008] Furthermore, the diameter of the rotating adjustment disk is greater than or equal to the diagonal length of the fixed guide disk.

[0009] Furthermore, the linkage unit includes an annular internal gear fixedly mounted on the back of the rotating adjustment disc, a gear three fixedly mounted on the threaded rod, and at least one planetary gear rotatably mounted on the movable frame, wherein the planetary gear meshes with both the annular internal gear and the gear three.

[0010] Furthermore, the movable frame is equipped with the rotating adjustment disk via an annular connector, and the annular connector is rotatably connected to the outer wall of the annular internal gear via a bearing.

[0011] Furthermore, the drive unit includes a motor fixed to the support frame, a gear one on the output shaft of the motor meshing with a gear two fixed to the end of the threaded rod, and the support frame fixed to the movable frame.

[0012] Furthermore, it also includes a guide unit, which includes an axial moving groove formed in the inner wall of the circular channel and a guide rod fixed in the moving groove. The end of the moving frame is provided with a moving block that slides with the moving groove and has a guide hole, and the guide rod passes through the guide hole.

[0013] Furthermore, a streamlined shuttle is coaxially provided in the gas diffusion section of the venturi sleeve, and the shuttle is fixedly connected to the movable frame or support frame through a connecting rod.

[0014] Furthermore, the shuttle is integrally and smoothly composed of a large ball end, a small ball end, and a tapered transition section connecting the two.

[0015] Furthermore, the large ball end faces the outlet of the steady flow section of the venturi sleeve.

[0016] The present invention has the following advantages: 1. This air intake adjustment mechanism couples the axial movement and differential rotation of the rotating adjustment disc to a single threaded rod drive via a planetary gear linkage unit. This allows the operator to simultaneously and synchronously change the distance between the rotating adjustment disc and the fixed guide disc, as well as the angle of the rotating adjustment disc itself, simply by controlling a single motor to drive the threaded rod in both forward and reverse directions. Moving it forward or backward directly controls the degree of airflow mixing and the vertical distribution weight, while the accompanying differential rotation changes the projection position of the high-flow area in the horizontal direction in real time. This linkage mechanism, which adjusts two aspects simultaneously, achieves the most complex control of the three-dimensional distribution of airflow with the simplest mechanical structure, greatly simplifying the operating logic and making precise adjustment for complex and uneven working conditions intuitive and efficient. 2. This air intake adjustment mechanism, with its two-stage air distribution structure working in conjunction with the aforementioned linkage mechanism, produces a remarkable improvement in drying uniformity. The fixed rectangular guide plate, through a gradient of apertures (larger at the bottom and smaller at the top), constructs a basic vertical airflow model to counteract the upward movement of hot air. The movable circular adjustment plate, through density partitioning on the left and right sides with a sparser middle section, constructs an adjustable horizontal airflow model. When the linkage mechanism drives the circular plate to both move and rotate, these two static airflow models are dynamically superimposed and modulated. For example, by moving the circular plate forward and rotating it to a specific angle, the lower left corner of the drying chamber can simultaneously receive dual airflow gains from the large aperture at the bottom and the high density on the left, thereby achieving powerful targeted drying of localized high-humidity areas. This synergy allows the mechanism to flexibly adapt to various situations of uneven loading and uneven humidity distribution, making the previously difficult-to-solve problem of localized drying lag adjustable and controllable, fundamentally improving overall drying uniformity and efficiency. 3. This air inlet regulating mechanism, with the introduction of the Venturi tube and shuttle, further optimizes the initial quality of the airflow and forms an effective synergy with the subsequent regulating mechanism. The Venturi structure pre-compresses and accelerates the airflow, while the streamlined shuttle located at the center of its diffuser section effectively disperses any potential high-speed jets, promoting premixing and flow field stabilization before the airflow enters the regulating area. More importantly, the shuttle is linked to the regulating mechanism via a connecting rod, and its position moves synchronously with the circular disk. When moving forward to enhance drying, the shuttle is closer to the Venturi throat, resulting in stronger rectification and acceleration effects, providing a more impactful airflow source downstream. When moving backward to pursue uniformity, the shuttle moves further away, allowing the airflow to gain more natural diffusion space and become gentler. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of an air intake adjustment mechanism proposed in this invention; Figure 2 To extend the main view of the box; Figure 3 for Figure 2 Internal view diagram; Figure 4 for Figure 3 A side view diagram; Figure 5 for Figure 2 A cross-sectional view; Figure 6 This is an exploded view of the mobile frame; Figure 7 A front view of the fixed guide plate; Figure 8 This is a frontal view of the rotating adjustment dial.

[0018] In the diagram: 1. Drying oven; 101. Air inlet; 102. Ventilation hood; 103. Air inlet pipe; 104. Sealing plate; 2. Drying device (drying fan that generates high-temperature dry gas); 3. Drying rack; 301. Frame; 302. Partition plate; 4. Extension box; 401. Circular channel; 402. Fixed guide plate; 403. Rotary adjusting plate; 501. Threaded rod; 502. Connecting sleeve; 503. Annular internal gear 504. Moving frame; 505. Planetary gear; 506. Annular connector; 507. Support frame; 508. Gear three; 601. Motor; 602. Gear one; 603. Gear two; 701. Moving block; 702. Moving groove; 703. Guide hole; 704. Guide rod; 8. Venturi sleeve; 901. Shuttle; 902. Large ball end; 903. Small ball end; 904. Transition section; 11. Connecting rod; Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1; Reference Figures 1-8 An air intake regulating mechanism and a tunnel-type mushroom drying device containing the mechanism are disclosed. The device includes a drying box 1, a drying rack 3 inside the drying box 1, and a frame 301. The frame 301 is a rectangular frame with openings on both sides. Two partitions 302 are installed inside the frame 301, and a placement platform is formed by the partitions 302 and the bottom of the inner wall of the frame 301. An airflow transmission channel is formed above each placement platform. Both sides of the drying oven 1 are designed with openings, and sealing plates 104 are fixedly installed on the outside. The two sealing plates 104 are respectively provided with air inlets 101 and air outlets. The outer side of the air inlet 101 is connected to the air diffuser 102, and the input end of the air diffuser 102 is connected to the air inlet pipe 103. The top of the drying chamber 1 is equipped with a drying device 2, which is a drying fan that generates high-temperature drying gas. The output end of the drying fan is connected to the input end of the air inlet pipe 103. Working principle: The high-temperature drying gas generated by the drying fan is transported to the air diffuser 102 through the air inlet pipe 103. After initial diffusion, it enters the drying chamber 1 through the air inlet 101. The gas flows through the airflow transmission channel formed by the multi-layer drying rack 3 in the chamber to dry the mushrooms. Finally, it carries the moisture and is discharged from the air outlet. Example 2: Basically the same as in Example 1, but further: referring to Figures 1-8 An air intake adjustment mechanism, wherein the air diffuser 102 includes an extension box 4, the interior of which is provided with a circular channel 401, both ends of the extension box 4 are provided with an open structure, one end of the extension box 4 is covered by the sealing plate 104 on the side away from the drying box 1, and the other end is connected to a Venturi sleeve 8, together forming the air diffuser 102. A fixed guide plate 402 is fixedly installed on the air inlet 101 of the sealing plate 104. The fixed guide plate 402 is a rectangular plate, and its surface is divided into three strip-shaped areas along the height direction: upper, middle and lower. Each strip-shaped area is filled with round holes evenly distributed in an equilateral triangle array, and the hole diameter decreases from bottom to top, that is, the hole diameter is the largest in the lower layer, the hole diameter is the smallest in the upper layer, and the hole diameter is in the middle in the middle layer. This design aims to establish a basic vertical airflow distribution model to compensate for the natural upward floating effect of hot air. A rotating adjusting disk 403 is slidably connected within the circular channel 401. The diameter of the rotating adjusting disk 403 is greater than or equal to the diagonal length of the fixed guide disk 402 to ensure that it can completely cover the effective area of ​​the fixed guide disk 402. The rotating adjusting disk 403 is a circular plate, and its surface is divided into three equal-area sector regions by three rays emanating from the center and forming an angle of 120° with each other: the left sector, the middle sector, and the right sector. The diameter of the circular holes in all sector regions is the same, but the hole distribution density is different: the left and right sectors are high-density hole distribution areas, and the middle sector is a low-density hole distribution area. This design aims to establish an adjustable horizontal airflow distribution model to compensate for the problem of excessive airflow in the middle caused by central air intake. A threaded rod 501 is installed on the central axis of the circular channel 401. A connecting sleeve 502 with internal threads is fixedly installed at the center of the fixed guide plate 402. The inner wall of the connecting sleeve 502 is threadedly connected to the outer wall of the threaded rod 501. A cross-shaped movable frame 504 is rotatably connected to the other end of the threaded rod 501. A guide unit is provided between the end of the movable frame 504 and the inner wall of the circular channel 401 to restrict the movable frame 504 to slide only along the channel axis and not rotate. A support frame 507 is fixedly installed on the outer wall of the movable frame 504 away from the fixed guide plate 402. A drive unit is provided between the support frame 507 and the threaded rod 501 to drive the threaded rod 501 to rotate. The rotating adjustment disk 403 is located on the side of the movable frame 504 near the fixed guide disk 402. The center of the rotating adjustment disk 403 is rotatably connected to the outer wall of the threaded rod 501 through a bearing. This means that the rotation of the threaded rod 501 will not directly force the rotating adjustment disk 403 to rotate synchronously, but the axial movement of the threaded rod 501 will push the rotating adjustment disk 403 to move together through the bearing. Working process: The drive unit drives the threaded rod 501 to rotate. Due to the action of the threaded pair (threaded rod 501 and connecting sleeve 502), the threaded rod 501 will move axially at the same time, thereby driving the rotating adjusting disk 403 connected to it by the bearing and the support frame 507 fixed by the moving frame 504 and other components to move axially along the circular channel 401, so as to realize the adjustment of the distance between the rotating adjusting disk 403 and the fixed guide disk 402. Furthermore: The outer wall of the rotary adjustment disk 403 near the moving frame 504 is provided with a linkage unit between the threaded rod 501 and the moving frame 504. Its core function is to enable the rotary adjustment disk 403 to move axially with the threaded rod 501 while also rotating controllably relative to the moving frame 504 (i.e. relative to the drying chamber). The reason why the rotary adjustment disk 403 is not directly fixed to the threaded rod 501 (that would cause its rotation to be completely synchronized with the rotation of the threaded rod and be unchangeable) is that the directly fixed rotation ratio (the disk rotates once when the screw rotates once) is too simple and cannot adapt to the fine airflow adjustment logic required by this solution. The linkage unit includes: an annular internal gear 503 fixedly installed on the outer wall of the rotary adjustment disk 403 near the movable frame 504, and a gear 508 fixedly installed on the outer wall of the threaded rod 501; an annular connector 506 is fixedly installed on the end of the movable frame 504 near the rotary adjustment disk 403, and the inner side of the annular connector 506 is rotatably connected to the outer wall of the annular internal gear 503 through a bearing, so that the rotary adjustment disk 403 can rotate freely relative to the movable frame 504 and maintain linkage with the movable frame 504 in the axial direction; one or more planetary gears 505 are rotatably installed on the annular connector 506, and their two sides are respectively meshed with the annular internal gear 503 and the gear 508, forming a planetary gear system; The drive unit includes a motor 601 fixedly mounted on a support frame 507. A gear 602 is fixedly connected to the output end of the motor 601, and a gear 603 is fixedly mounted to the end of the threaded rod 501. The gear 602 and the gear 603 are meshed together, thereby transmitting the rotational power of the motor to the threaded rod 501. The guiding unit includes: a movable groove 702 opened on the inner wall of the circular channel 401; movable blocks 701 are fixedly connected to each end of the cross-shaped movable frame 504; the outer wall of the movable block 701 is slidably connected to the inner wall of the movable groove 702; a guide rod 704 is fixedly installed on the inner wall of the movable groove 702; and the outer wall of the guide rod 704 is slidably connected to the inner wall of the guide hole 703 opened on the movable block 701, so as to ensure that the moving trajectory of the movable frame 504 is accurate and stable. Working principle: When the motor 601 starts, it drives the threaded rod 501 to rotate through gear 602 and gear 603, and the system generates a compound motion. Axial movement: The threaded rod 501 will inevitably produce axial displacement because it meshes with the fixed connecting sleeve 502, which will drive the entire moving frame 504 assembly and the rotating adjusting plate 403 to move axially along the circular channel 401, changing the distance between the two plates. Differential rotation: At the same time, the rotation of the threaded rod 501 drives the gear 3 508 on it to rotate; the gear 3 508 drives the ring internal gear 503 through the planetary gear 505, which in turn drives the rotating adjustment disk 403 to rotate; the key is that since the rotating adjustment disk 403 is also moving axially at the same time, its rotational speed is the differential result of the combined action of the rotational speed of the gear 3 508 and the axial movement speed of the planetary carrier (i.e., the moving carrier 504); through precise gear tooth design, an ideal motion relationship can be preset, for example: when the threaded rod 501 drives the rotating adjustment disk 403 from the position with the largest spacing to the position with the smallest spacing (2 meters of axial movement throughout the entire process), the linkage unit just drives the rotating adjustment disk 403 to rotate 240 degrees; The significance of coordinated regulation: Individually adjust the spacing (G): This mainly affects the vertical uniformity and overall strength of the airflow distribution; when moving forward (G decreases), the airflow mixing weakens, the aperture gradient effect of the rectangular fixed guide plate 402 is amplified, the lower airflow is significantly strengthened, and the overall airflow velocity and penetration are enhanced, which is suitable for initial rapid dehydration or conditions where the lower layer humidity is too high; when moving backward (G increases), the airflow is fully diffused and mixed between the two plates, the vertical airflow difference is weakened, the overall distribution tends to be uniform and gentle, and the flow velocity is reduced, which is suitable for later slow drying or protective drying. Linked adjustment (movement accompanied by rotation): In a single operation, the vertical weight distribution and the horizontal flow distribution are simultaneously altered. For example, when a high-humidity area in the lower left corner needs to be treated forcefully, the rotating adjustment disk 403 can be moved forward and rotated clockwise. Moving forward strengthens the overall airflow in the lower layer, while clockwise rotation allows the high-density orifice area on the rotating adjustment disk 403 to cover more of the left side area. The linkage between the two allows the lower left corner to simultaneously receive dual airflow gains from the large aperture in the lower layer and the high density on the left side, achieving precise and efficient local drying enhancement. Conversely, by using different combinations of movement and rotation, various complex airflow unevenness problems can be addressed. Example 3: Basically the same as Example 2; furthermore: referring to Figures 1-8An air intake regulating mechanism is provided, wherein the Venturi sleeve 8 includes an air intake compression section, a middle flow stabilization section, and an air outlet diffusion section; a shuttle 901 is provided at the center of the air outlet diffusion section. The shuttle 901 has a unique shape, consisting of a large-diameter hemisphere and a small-diameter hemisphere facing each other, with their cut surfaces corresponding; between the two hemispheres, a frustum of diameter is connected, with its diameter decreasing uniformly from the large-diameter end 902 to the small-diameter end 903; the large-diameter end of the frustum is connected to the cut surface of the large sphere and has the same diameter as it; the small-diameter end of the frustum is connected to the cut surface of the small sphere and has the same diameter as it; thus, the large-diameter hemisphere end forms the large-diameter end 902, the small-diameter hemisphere end forms the small-diameter end 903, and the conical frustum in the middle forms the transition section 904, and the three are smoothly connected to form an integral streamlined structure; the shuttle 901 is fixedly connected to the support frame 507 through a connecting rod 11, thereby linking with the regulating mechanism, and its axial position moves synchronously with the rotating regulating disc 403; Working principle: The high-pressure gas from the drying fan is accelerated by the inlet compression section of the Venturi tube and forms a relatively concentrated and high-speed core airflow in the steady flow section. When this airflow enters the diffusion section, although the pipe diameter is increased to help the airflow diffuse, the airflow velocity and momentum in the core area are still significantly higher than those in the outer area. The dispersing effect of the large ball end 902: The large ball end 902 of the shuttle 901 is directly facing the outlet of the steady flow section; the high-speed core airflow directly impacts the spherical surface of the large ball end 902, is effectively blocked and decomposed and diffuses radially in all directions, destroying any possible airflow core, and forcing the high-speed airflow in the center to start mixing with the low-speed airflow in the periphery in advance. The guiding function of transition section 904: After being guided by the large ball end 902, the airflow flows along the conical inclined surface of transition section 904; this gradually narrowing inclined surface can smoothly guide the radially diffused airflow to turn back to the axial direction and accelerate the flow through the annular space between transition section 904 and diffuser section wall, which helps to stabilize the flow field and reduce eddies; The rectifying effect of the ball end 903: Finally, the airflow passes through the ball end 903; the hemispherical tail of the ball end 903 helps to reduce airflow separation and wake region, making the outflowing airflow smoother and more uniform; finally, under the combined action of the shuttle 901 and the diffuser section of the Venturi sleeve 8, the velocity distribution (profile uniformity) and flow field stability of the airflow delivered to the front of the downstream rotating regulating disk 403 are significantly improved. Synergy with the regulating mechanism: Shuttle 901 moves synchronously with the regulating disc; when moving forward, shuttle 901 is closer to the outlet of the Venturi tube's steady flow section, and its effect on dispersing and accelerating the core airflow is more direct, providing a more impactful airflow source for the subsequent regulating disc to enhance vertical airflow distribution; when moving backward, shuttle 901 is further away from the outlet, and its effect is relatively weakened, allowing the airflow more sufficient natural diffusion time in the Venturi diffusion section, providing a gentler airflow basis for the subsequent regulating disc to achieve uniform mixing; this synergistic design enables the entire system to maintain a coordinated and consistent regulating logic from the source to the distribution end, thereby achieving better drying uniformity and efficiency.

Claims

1. An air intake regulating mechanism, characterized in that, The equipment includes a drying chamber (1) and an air inlet pipe (103) connected to the air inlet (101) of the drying chamber (1). The air inlet pipe (103) is connected to the air inlet (101) through a diffuser hood (102). The diffuser hood (102) includes an extension box (4) and a venturi sleeve (8). The extension box (4) is provided with a circular channel (401). The circular channel (401) is provided with a two-stage air distribution and linkage adjustment assembly for three-dimensional distribution and adjustment of the airflow entering the drying chamber (1). The two-stage air distribution and linkage adjustment assembly includes: A rectangular fixed guide plate (402) is fixedly installed at the air inlet (101). Its plate surface is divided into at least two strip areas along the height direction, and each area is provided with air passage holes of different diameters. A circular rotating adjustment disk (403) is coaxially disposed upstream of the fixed guide disk (402), and its plate surface is divided into at least two sectors, each sector being provided with airflow holes of different densities; The axial moving unit includes an axially extending threaded rod (501), a connecting sleeve (502) threadedly engaged with the threaded rod (501) and fixed to the center of the fixed guide plate (402), and a moving frame (504) driven by the threaded rod (501) to move axially along the circular channel (401). The rotating adjusting plate (403) is rotatably mounted on the moving frame (504) and moves axially synchronously with it to adjust its distance from the fixed guide plate (402). The linkage unit is connected between the threaded rod (501) and the rotary adjustment disk (403) so that when the threaded rod (501) rotates and drives the moving frame (504) to move axially, the rotary adjustment disk (403) can be synchronously driven to rotate differentially around its axis. A drive unit is used to drive the threaded rod (501) to rotate.

2. The air intake regulating mechanism according to claim 1, characterized in that, The fixed guide plate (402) is divided into three strip-shaped areas along the height direction: upper, middle and lower. The circular holes arranged in each strip-shaped area are evenly distributed in an equilateral triangle array, and the diameter of the circular holes decreases from bottom to top.

3. The air intake regulating mechanism according to claim 1, characterized in that, The surface of the rotating adjustment disk (403) is divided into three equal-area sector regions by three rays that originate from the center and are at an angle of 120° to each other. The diameter of the circular holes in all sector regions is the same, but the hole density in the left and right sectors is higher than that in the middle sector.

4. The air intake regulating mechanism according to claim 3, characterized in that, The diameter of the rotating adjustment disk (403) is greater than or equal to the diagonal length of the fixed guide disk (402).

5. The air intake regulating mechanism according to claim 1, characterized in that, The linkage unit includes an annular internal gear (503) fixedly mounted on the back of the rotary adjustment disk (403), a gear three (508) fixedly mounted on the threaded rod (501), and at least one planetary gear (505) rotatably mounted on the movable frame (504). The planetary gear (505) meshes with both the annular internal gear (503) and the gear three (508).

6. The air intake regulating mechanism according to claim 5, characterized in that, The movable frame (504) is mounted on the rotating adjustment disk (403) via an annular connector (506), and the annular connector (506) is rotatably connected to the outer wall of the annular internal gear (503) via a bearing.

7. The air intake regulating mechanism according to claim 1, characterized in that, The drive unit includes a motor (601) fixed on a support frame (507), a gear one (602) on the output shaft of the motor (601) meshing with a gear two (603) fixed to the end of the threaded rod (501), and the support frame (507) fixed on the movable frame (504).

8. The air intake regulating mechanism according to claim 1, characterized in that, It also includes a guide unit, which includes an axial moving groove (702) opened in the inner wall of the circular channel (401) and a guide rod (704) fixed in the moving groove (702). The end of the moving frame (504) is provided with a moving block (701) that slides with the moving groove (702) and has a guide hole (703). The guide rod (704) passes through the guide hole (703).

9. The air intake regulating mechanism according to claim 1, characterized in that, A streamlined shuttle (901) is coaxially provided in the gas diffusion section of the Venturi sleeve (8). The shuttle (901) is fixedly connected to the movable frame (504) or the support frame (507) through the connecting rod (11).

10. An air intake regulating mechanism according to claim 9, characterized in that, The shuttle (901) is integrally and smoothly composed of a large ball end (902), a small ball end (903), and a tapered transition section (904) connecting the two.

11. The air intake regulating mechanism according to claim 10, characterized in that, The large ball end (902) faces the outlet of the steady flow section of the Venturi sleeve (8).

12. A tunnel-type mushroom drying device containing an air intake regulating mechanism, characterized in that, Includes an air intake regulating mechanism as described in any one of claims 1-11.

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