A multi-layered track-type smoking structure

Abstract

This invention discloses a multi-layer track-type tobacco drying structure, belonging to the field of tobacco processing technology. It includes a frame and multiple tobacco drying modules densely arranged along the width of the frame. Each drying module includes drying channels and vertical tracks. Multiple drying channels are equidistantly distributed along the height of the frame. The drying module also includes a lifting and changing track assembly, an equidistant unfolding and retracting assembly, a synchronous angle-changing assembly, and a drying and folding unit. Through this multi-level, three-dimensional structure, the equipment footprint is reduced by approximately six times compared to traditional planar drying. Furthermore, the tobacco drying modules adopt a standardized design, possessing strong replicability and combination flexibility, meeting the needs of large-scale intensive production. Operators only need to operate at the end of the drying channels. The equidistant unfolding and retracting assembly can control the synchronous unfolding or retraction of the entire layer of drying and folding units at once, eliminating the tedious manual placement process and significantly shortening the time for loading and unloading tobacco.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, specifically to a multi-layer track-type tobacco drying structure. Background Technology

[0002] After the tobacco leaves mature, farmers need to spread the harvested mature tobacco leaves flat on tobacco folds, clamp them tightly, and then place them in the sun to dry. However, the traditional method of sun-drying tobacco has the following problems: 1. Labor intensity and efficiency bottleneck: Traditional methods require manual picking of each leaf, which is extremely labor-intensive and limits the planting area per household (usually only 1-5 mu), making it difficult to achieve large-scale production.

[0003] 2. Low space utilization: Traditional tobacco drying can only be done in single or double layers, occupying a large amount of land area and cannot cope with rainy weather.

[0004] 3. Quality control challenges: Although greenhouses can provide rain protection, their ventilation and moisture dissipation effects are poor, which can easily lead to changes in the flavor of tobacco leaves and make it difficult to maintain the characteristics of traditional sun-dried tobacco leaves.

[0005] Based on this, the present invention designs a multi-layer track-type tobacco drying structure to solve the problem of intensive and large-scale tobacco drying production. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a multi-layer track-type tobacco drying structure.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A multi-layer track-type tobacco drying structure includes a frame and multiple tobacco drying modules densely arranged along the width of the frame; The tobacco drying module includes drying channels and vertical rails. Multiple drying channels are provided and are equidistantly distributed along the height of the frame. Each drying channel consists of two transverse rails fixed to the inside of the frame. Multiple vertical rails are provided and fixed to the ends of the frame along its length, with the inside of the vertical rails aligned with the ends of the transverse rails. The tobacco drying module also includes a lifting and changing track assembly, an equidistant retraction and extension assembly, a synchronous angle changing assembly, and drying folding units. Multiple drying folding units are provided, and the drying folding units can be slidably installed on the transverse tracks of the drying track along its length. The lifting and changing track assembly is installed inside each vertical track and is used to drive the drying folding units to switch to different layers of the drying track. An equidistant retraction and extension assembly and a synchronous angle changing assembly are installed on the frame at the end of each drying track, and the output ends of the equidistant retraction and extension assembly and the synchronous angle changing assembly are connected to all drying folding units in the same layer of the drying track.

[0008] Furthermore, the drying unit includes a crossbar, a support and fixing component, a tobacco drying fixing component, and a shaft head component. Two shaft head components are provided and are respectively installed at both ends of the crossbar. The two shaft head components are movably connected to the two transverse tracks of the drying channel. Multiple sets of support and fixing components are evenly installed on the crossbar along its length direction, and the support and fixing components are locked to the tobacco drying fixing components.

[0009] Furthermore, the support and fixing assembly includes a fixed bracket, a movable pressure strip, an elbow, and a hook. The fixed bracket is fixed to the crossbar by a connector, and multiple elbows are fixed to the fixed bracket along its length. One end of the movable pressure strip is hinged to one end of the fixed bracket, and the other end of the movable pressure strip is fixed to a hook. The movable pressure strip is also engaged with the elbow.

[0010] Furthermore, the tobacco drying fixing component includes a folded bottom, a folded top, and buckles. Multiple buckles are evenly fixed to the edge of the folded bottom, and the folded top is engaged with the buckles. The folded bottom and the folded top are located inside the fixed bracket and the movable pressure strip.

[0011] Furthermore, the shaft head assembly includes a shaft rod, a bushing, and a tensioning and fixing assembly. One end of the shaft rod is rotatably connected to an "H"-shaped bushing via a bearing, and the bushing is slidably connected to the upper end of the transverse track. The other end of the bushing is connected to the crossbar via the tensioning and fixing assembly.

[0012] Furthermore, the tensioning and fixing assembly includes a fastening sleeve, an inner cone, an outer cone, and a fastening nut. The inner and outer cones are fixed to the shaft. The fastening sleeve is sleeved on the outside of the shaft and is located between the inner and outer cones. The inner cone is located at the end of the shaft away from the bushing and inside the crossbar. The fastening nut is screwed to the shaft and is located on the side of the outer cone away from the inner cone.

[0013] Furthermore, each of the four corners of the folded bottom is fixed with a hanging head, and a pull tab is fixed to the bushing.

[0014] Furthermore, the lifting and changing track assembly includes a third sprocket drive assembly, a lifting chain, a track, and support blocks. The third sprocket drive assembly is fixedly installed inside each vertical track, and its output end is driven and connected to the lifting chain. Multiple support blocks are fixedly installed at equal intervals on the lifting chain, and each support block has a groove that mates with a shaft. The spacing between adjacent support blocks is the same as the layer spacing between adjacent drying channels. A track is also fixedly installed on the vertical track, and the support blocks slide against the track, allowing the support blocks to move vertically along the track.

[0015] Furthermore, the equidistant retraction and extension assembly includes a first sprocket drive assembly, a first main chain, and a first secondary chain. The first sprocket drive assembly is fixedly mounted on the frame, and its output end is driven and connected to the first main chain. The pull tabs of adjacent drying and folding units on the drying track are fixedly connected through the first secondary chain, and the first main chain is fixedly connected to the pull tabs of the drying and folding units at the end of the drying track.

[0016] Furthermore, the synchronous angle-changing component includes a second sprocket drive component, a second main chain, and a second auxiliary chain. Two second sprocket drive components are provided and distributed on the upper and lower sides of the first sprocket drive component. The second sprocket drive component is fixedly connected to the frame, and the output end of the second sprocket drive component is fixedly connected to one of the second main chains. The hanging heads of adjacent drying and folding units on the drying track are fixedly connected through the second auxiliary chain, and the second main chains on the upper and lower sides are fixedly connected to the hanging heads on the upper and lower sides of the drying and folding units at the end of the drying track, respectively.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: 1. Space utilization and land intensification have been significantly improved. Employing a multi-layered, three-dimensional structure, it reduces the floor space required by approximately six times compared to traditional flat-panel drying. Furthermore, the standardized design of the tobacco drying module provides excellent replicability and flexibility in combination, meeting the demands of large-scale, intensive production.

[0018] 2. Achieve differentiated humidity and light gradient control with a "dense at the bottom and sparse at the top" effect. Based on the environmental distribution patterns of vertical space, the design employs a gradient layout with high density (small spacing) at the bottom and low density (large spacing) at the top. The bottom layer, closer to the ground, experiences higher humidity, and the high-density tobacco loading helps meet the humidity requirements during the yellowing stage of the tobacco leaves. The upper layers receive more sunlight and have lower humidity, and the low-density tobacco loading avoids excessive sun exposure, meeting the requirements for color fixing and drying stages. Combined with synchronous angle-changing components, the entire layer of drying and folding units can be controlled to rotate synchronously to any angle, thus precisely matching the humidity and light requirements of the tobacco leaves at different stages of the curing process, optimizing the drying quality.

[0019] 3. Significantly reduces manual labor intensity and improves work efficiency. The operator only needs to operate at the end of the drying channel. The equidistant unfolding and unfolding components can control the entire layer of drying and folding units to unfold or fold at the same time, eliminating the tedious process of manually placing each unit and significantly shortening the operation time for loading and unloading tobacco.

[0020] 4. Enable flexible, assembly-line-style, batch-based, rolling operations. The lifting and changing track assembly enables stable transfer of the drying and folding unit between different drying channels; combined with the synchronous angle changing assembly, the entire layer of drying and folding units can be controlled to rotate synchronously to any angle. This combination allows the tobacco drying process to move beyond a single, complete transfer, enabling a flexible, continuous, rolling, batch operation mode of "daily transfer of the bottom layer of drying and folding units upwards," better meeting the phased needs of tobacco biochemical reactions and maximizing facility reuse. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The structure is a multi-layered track-type tobacco drying structure. Figure 1 ; Figure 2 The structure is a multi-layered track-type tobacco drying structure. Figure 2 ; Figure 3 The structure is a multi-layered track-type tobacco drying structure. Figure 3 ; Figure 4 This is a three-dimensional structural diagram of the folding unit; Figure 5 A three-dimensional structural view of the crossbar and supporting fixing components; Figure 6 A three-dimensional structural diagram of the tobacco drying fixing component; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a three-dimensional structural view of the shaft head assembly; Figure 9 A three-dimensional structural view of the equidistant extension and retraction component and the synchronous variable angle component; Figure 10 This is a three-dimensional structural diagram of the lifting and changing rail assembly.

[0023] The labels in the diagram represent: 1. Frame; 2. Horizontal rail; 3. Vertical rail; 4. Lifting and rail changing assembly; 41. Third sprocket drive assembly; 42. Lifting chain; 43. Guide rail; 44. Support block; 5. Equidistant retraction and unfolding assembly; 51. First sprocket drive assembly; 52. First main chain; 53. First secondary chain; 6. Synchronous angle changing assembly; 61. Second sprocket drive assembly; 62. Second main chain; 63. Second secondary chain; 7. Drying and folding unit; 71. Crossbar 72. Support and fixing components; 721. Fixing bracket; 722. Movable pressure strip; 723. Elbow; 724. Hook; 73. Tobacco drying fixing components; 731. Folded bottom; 732. Folded top; 733. Buckle; 734. Hanging head; 74. Shaft head assembly; 741. Shaft rod; 742. Shaft sleeve; 743. Pull tab; 744. Fastening sleeve; 745. Inner cone; 746. Outer cone; 747. Fastening nut; 8. Rainproof bag. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] The terms "left, right, front, back, up, down" mentioned in the following description refer to the orientation from the perspective of the front view.

[0026] In some embodiments, please refer to the accompanying drawings. Figures 1-10 A multi-layer track-type tobacco drying structure includes a frame 1 and multiple tobacco drying modules densely arranged along the width direction of the frame 1. The tobacco drying module includes drying channels and vertical rails 3. Multiple drying channels are provided and are equidistantly distributed along the height direction of the frame 1. Each drying channel is composed of two transverse rails 2 fixed to the inner side of the frame 1. Multiple vertical rails 3 are provided and fixed to the ends of the frame 1 along its length direction, and the inner side of the vertical rail 3 is aligned with the end of the transverse rail 2. The tobacco drying module also includes a lifting and changing track assembly 4, an equidistant retraction and extension assembly 5, a synchronous angle changing assembly 6, and a drying folding unit 7. Multiple drying folding units 7 are provided, and the drying folding units 7 can be slidably installed on the transverse track 2 of the drying channel along the length of the drying channel. The lifting and changing track assembly 4 is installed inside each vertical track 3 and is used to drive the drying folding units 7 to switch between different layers of the drying channel. The equidistant retraction and extension assembly 5 and the synchronous angle changing assembly 6 are installed on the frame 1 at the end of each drying channel. The output ends of the equidistant retraction and extension assembly 5 and the synchronous angle changing assembly 6 are connected to all the drying folding units 7 of the same layer of the drying channel.

[0027] In this embodiment, the number of drying folding units 7 on the drying channel of each tobacco drying module decreases layer by layer from bottom to top, and the drying folding units 7 on adjacent drying channels are staggered.

[0028] In this invention, since the bottom drying channel is close to the ground and has a higher humidity, the spacing of the drying folding units 7 on the drying channel is small and the tobacco loading density is high. As the height of the drying channel increases, the humidity decreases and the light intensity increases, the spacing of the drying folding units 7 on the drying channel gradually increases and the tobacco loading density decreases, forming a gradient distribution of "dense at the bottom and sparse at the top" to achieve efficient utilization of vertical space and gradient control of tobacco humidity and tobacco light.

[0029] This invention adopts a multi-layer three-dimensional structure design. Each standard tobacco drying module is two meters wide, with a total of six layers and a layer spacing of about 850 millimeters. Compared with traditional flat drying, the floor space is reduced by about six times. The tobacco drying modules are easy to replicate and combine, and can be added or removed arbitrarily according to actual needs, meeting the needs of intensive and large-scale tobacco drying production.

[0030] The operator can work only at the end of the tobacco drying module, install all the drying folding units 7 required for one layer of drying channel on the drying channel at once, and then control the drying folding units 7 on the entire layer of drying channel to unfold at equal intervals through the equidistant unfolding component 5. After the tobacco drying operation, the drying folding units 7 on the entire layer of drying channel are folded up by controlling the unfolding of the drying folding units 7 on the entire layer of drying channel, thereby significantly reducing the intensity of manual labor and improving the efficiency of tobacco drying. During the tobacco drying process, the synchronous angle-changing component 6 can control the drying folding units 7 on the entire drying channel to rotate synchronously at any angle, and the lifting and changing track component 4 can control the drying folding units 7 to be transferred to different drying channels to meet the needs of the tobacco drying process and realize a batch-by-batch production line mode; for example, the bottom part of the drying folding units 7 can be transferred upwards every day to form a continuous rolling operation, rather than a one-time overall transfer.

[0031] Considering the inconvenience of high-rise operation, it is planned to equip the end of the frame 1 with a lifting platform that can be moved between different drying modules to meet the needs of operating the drying and folding unit 7 on the high-rise drying channel.

[0032] The drying and folding unit 7 includes a crossbar 71, a support and fixing component 72, a tobacco drying fixing component 73, and a shaft head component 74. Two shaft head components 74 are provided and are respectively installed at both ends of the crossbar 71. The two shaft head components 74 are respectively movably connected to the two transverse tracks 2 of the drying channel. Multiple sets of support and fixing components 72 are evenly installed on the crossbar 71 along its length direction. The support and fixing components 72 are locked to the tobacco drying fixing component 73. The support and fixing assembly 72 includes a fixed bracket 721, a movable pressure strip 722, an elbow 723, and a hook 724. The fixed bracket 721 is fixed to the crossbar 71 by a connector, and multiple elbows 723 are fixed to the fixed bracket 721 along its length. One end of the movable pressure strip 722 is hinged to one end of the fixed bracket 721, and the other end of the movable pressure strip 722 is fixed to a hook 724. The movable pressure strip 722 is also engaged with the elbow 723. In this embodiment, the connector adopts a pressure strip and bolt and nut structure to facilitate the disassembly, assembly and replacement of the support fixing component 72 on the crossbar 71.

[0033] The tobacco drying fixing component 73 includes a bottom fold 731, a top fold 732, and a buckle 733. Multiple buckles 733 are evenly fixed to the edge of the bottom fold 731. The top fold 732 is engaged with the buckles 733. The bottom fold 731 and the top fold 732 are located inside the fixing bracket 721 and the movable pressure strip 722.

[0034] In this embodiment, the buckle 733 adopts a double-row multi-link progressive chain integral molding structure, which is composed of two parallel arc-shaped chains and multiple sets of interlocking and nested ring units connected in series. One end of the buckle 733 is open and has a figure-eight shaped guide structure, while the other end of the buckle 733 is completely closed into a ring. The bottom fold 731 is fixed to the innermost ring unit of the buckle 733, and the top fold 732 is engaged with the outer ring unit of the buckle 733. By controlling the engagement of the top fold 732 with ring units of different layers, the distance between the bottom fold 731 and the top fold 732 can be adjusted to achieve the fixing effect of tobacco leaves of different thicknesses.

[0035] The shaft head assembly 74 includes a shaft 741, a bushing 742, and a tensioning and fixing assembly. One end of the shaft 741 is rotatably connected to the "H"-shaped bushing 742 via a bearing. The bushing 742 is slidably connected to the upper end of the transverse track 2. The other end of the bushing 742 is connected to the crossbar 71 via the tensioning and fixing assembly.

[0036] The tensioning and fixing assembly includes a fastening sleeve 744, an inner cone 745, an outer cone 746, and a fastening nut 747. The inner cone 745 and the outer cone 746 are fixedly connected to the shaft 741. The fastening sleeve 744 is sleeved on the outside of the shaft 741 and is located between the inner cone 745 and the outer cone 746. The inner cone 745 is located at the end of the shaft 741 away from the bushing 742 and is located inside the crossbar 71. The fastening nut 747 is screwed to the shaft 741 and is located on the side of the outer cone 746 away from the inner cone 745. In this embodiment, the crossbar 71 adopts a square steel structure, and both the inner cone 745 and the outer cone 746 adopt a four-sided cone structure. The fastening sleeve 744 is made of rubber. During installation, the inner cone 745 and the fastening sleeve 744 are first inserted into the crossbar 71. Then, the fastening nut 747 is rotated to move the outer cone 746 towards the inner cone 745, so that the inner cone 745 and the outer cone 746 cooperate to squeeze the fastening sleeve 744, thereby tightening the fastening sleeve 744 inside the crossbar 71, so that the shaft 741 is coaxially fixed with the crossbar 71.

[0037] In this invention, the tobacco leaves are first laid out on the bottom fold 731, and then the top fold 732 is fastened onto the bottom fold 731, so that the bottom fold 731 and the top fold 732 cooperate to clamp and fix the tobacco leaves. Then, the tobacco drying fixing assembly 73 is placed on the fixing bracket 721, and then the movable pressure strip 722 is flipped so that the hook 724 locks the movable pressure strip 722 and the elbow 723, thus achieving the overall installation effect of the tobacco drying fixing assembly 73. At this time, the bushing 742 is set on the transverse track 2 of the drying channel, so that the entire drying folding unit 7 can move along the drying channel.

[0038] Each of the four corners of the folded bottom 731 is fixed with a hanging head 734, and a pull tab 743 is fixed on the bushing 742.

[0039] The lifting and changing track assembly 4 includes a third sprocket drive assembly 41, a lifting chain 42, a guide rail 43, and support blocks 44. The third sprocket drive assembly 41 is fixedly installed inside each vertical rail 3. The output end of the third sprocket drive assembly 41 is drivenly connected to the lifting chain 42. Multiple support blocks 44 are fixedly installed at equal intervals on the lifting chain 42. The support blocks 44 have grooves that cooperate with the shaft 741. The spacing between adjacent support blocks 44 is the same as the layer spacing of adjacent drying channels. A guide rail 43 is also fixedly installed on the vertical rail 3. The support blocks 44 slide in contact with the guide rail 43 to ensure that the support blocks 44 can move vertically along the guide rail 43.

[0040] The equidistant retraction and extension assembly 5 includes a first sprocket drive assembly 51, a first main chain 52, and a first secondary chain 53. The first sprocket drive assembly 51 is fixedly installed on the frame 1. The output end of the first sprocket drive assembly 51 is driven and connected to the first main chain 52. The pull tabs 743 of adjacent drying and folding units 7 on the drying channel are fixedly connected through the first secondary chain 53. The first main chain 52 is fixedly connected to the pull tabs 743 of the drying and folding units 7 at the end of the drying channel. The synchronous angle-changing component 6 includes a second sprocket drive component 61, a second main chain 62, and a second auxiliary chain 63. Two second sprocket drive components 61 are provided and distributed on the upper and lower sides of the first sprocket drive component 51. The second sprocket drive components 61 are fixedly connected to the frame 1. The output ends of the two second sprocket drive components 61 are respectively connected to a second main chain 62. The hanging heads 734 of adjacent drying and folding units 7 on the drying track are fixedly connected through the second auxiliary chain 63. The second main chains 62 on the upper and lower sides are respectively fixedly connected to the hanging heads 734 on the upper and lower sides of the drying and folding unit 7 at the end of the drying track.

[0041] In this invention, when installing the folding drying unit 7 on the drying track, a first secondary chain 53 can be installed on the pull tab 743 of adjacent folding drying units 7, and a second secondary chain 63 can be installed on the hanging head 734. The first main chain 52 and the second main chain 62 are respectively connected to the pull tab 743 and the hanging head 734 of the end folding drying unit 7. The first main chain 52 is driven to move by the first sprocket drive assembly 51, which can drive the end folding drying unit 7 to move along the drying track. With the help of the first secondary chain 53, each folding drying unit 7 unfolds in sequence, achieving the effect of equidistant unfolding of the folding drying unit 7. The upper and lower second sprocket drive components 61 drive the second main chain 62 to move, which can control the rotation of the crossbar 71 of the end drying and folding unit 7 by a preset angle, and drive all drying and folding units 7 to rotate synchronously through the second auxiliary chain 63 to meet the requirements of the tobacco drying process; at the same time, the drying and folding unit 7 is pushed in the direction of the vertical track 3, so that the shaft 741 is lifted by the groove on the support block 44, and then the lifting chain 42 is driven by the third sprocket drive component 41 to move, so that the support block 44 drives the shaft 741 to rise and fall, thus realizing the effect of transferring the drying and folding unit 7 on the drying track of different layers.

[0042] In some embodiments, only one second sprocket drive assembly 61 is provided to simplify the overall structure and reduce costs.

[0043] In this embodiment, the spacing between adjacent folding units 7 after unfolding can be changed by altering the interval length of the first sub-chain 53.

[0044] In this embodiment, a rainproof bag 8 is also fixedly installed at the end of the frame 1. The rainproof bag 8 adopts a thin film structure, which can form a sealed space outside the folded drying unit 7 after being folded up, so as to maintain stable internal humidity and promote the internal biochemical reaction of tobacco leaves. (Turns yellow), and also has a rainproof function.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention 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. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-layer track-type tobacco drying structure, comprising a frame (1) and a plurality of tobacco drying modules densely arranged along the width direction of the frame (1), characterized in that: The tobacco drying module includes drying channels and vertical rails (3). Multiple drying channels are provided and are equidistantly distributed along the height direction of the frame (1). Each drying channel is composed of two transverse rails (2) fixed to the inner side of the frame (1). Multiple vertical rails (3) are provided and fixed to the ends of the frame (1) along its length direction. At the same time, the inner side of the vertical rail (3) is aligned with the end of the transverse rail (2). The tobacco drying module also includes a lifting and changing rail assembly (4), an equidistant retraction and extension assembly (5), a synchronous angle changing assembly (6), and a drying folding unit (7). Multiple drying folding units (7) are provided. The drying folding units (7) can be slidably installed on the transverse rail (2) of the drying channel along the length of the drying channel. The lifting and changing rail assembly (4) is installed inside each vertical rail (3) to drive the drying folding unit (7) to switch to different layers of the drying channel. The equidistant retraction and extension assembly (5) and the synchronous angle changing assembly (6) are installed on the frame (1) at the end of each drying channel. The output ends of the equidistant retraction and extension assembly (5) and the synchronous angle changing assembly (6) are connected to all drying folding units (7) of the same layer of the drying channel.

2. The multi-layer track-type tobacco drying structure according to claim 1, characterized in that, The drying unit (7) includes a crossbar (71), a support and fixing component (72), a tobacco drying fixing component (73), and a shaft head component (74). There are two shaft head components (74) installed at both ends of the crossbar (71). The two shaft head components (74) are movably connected to the two transverse tracks (2) of the drying channel. Multiple sets of support and fixing components (72) are evenly installed on the crossbar (71) along its length direction. The support and fixing components (72) are locked to the tobacco drying fixing component (73).

3. The multi-layer track-type tobacco drying structure according to claim 2, characterized in that, The support and fixing assembly (72) includes a fixed bracket (721), a movable pressure strip (722), an elbow (723), and a hook (724). The fixed bracket (721) is fixed to the crossbar (71) by a connector. Multiple elbows (723) are fixed to the fixed bracket (721) along its length. One end of the movable pressure strip (722) is hinged to one end of the fixed bracket (721). The other end of the movable pressure strip (722) is fixed to a hook (724), and the movable pressure strip (722) is engaged with the elbow (723).

4. The multi-layer track-type tobacco drying structure according to claim 3, characterized in that, The tobacco drying fixing component (73) includes a folded bottom (731), a folded top (732), and a buckle (733). Multiple buckles (733) are evenly fixed to the edge of the folded bottom (731). The folded top (732) is engaged with the buckles (733). The folded bottom (731) and the folded top (732) are located inside the fixed bracket (721) and the movable pressure strip (722).

5. The multi-layer track-type tobacco drying structure according to claim 4, characterized in that, The shaft head assembly (74) includes a shaft (741), a bushing (742) and a tensioning and fixing assembly. One end of the shaft (741) is rotatably connected to an "H"-shaped bushing (742) via a bearing. The bushing (742) is slidably connected to the upper end of the transverse track (2). The other end of the bushing (742) is connected to the crossbar (71) via the tensioning and fixing assembly.

6. The multi-layer track-type tobacco drying structure according to claim 5, characterized in that, The tensioning and fixing assembly includes a fastening sleeve (744), an inner cone (745), an outer cone (746), and a fastening nut (747). The inner cone (745) and the outer cone (746) are both fixed to the shaft (741). The inner cone (745) is located on the inner side of the crossbar (71) at the end of the shaft (741) away from the bushing (742). The fastening sleeve (744) is sleeved on the outer side of the shaft (741) and is located between the inner cone (745) and the outer cone (746). The fastening nut (747) is screwed to the shaft (741) and is located on the side of the outer cone (746) away from the inner cone (745).

7. The multi-layer track-type tobacco drying structure according to claim 6, characterized in that, Each of the four corners of the folded bottom (731) is fixed with a hanging head (734), and a pull tab (743) is fixed on the bushing (742).

8. The multi-layer track-type tobacco drying structure according to claim 7, characterized in that, The lifting and changing track assembly (4) includes a third sprocket drive assembly (41), a lifting chain (42), a guide rail (43), and a support block (44). The third sprocket drive assembly (41) is fixedly installed inside each vertical rail (3). The output end of the third sprocket drive assembly (41) is driven and connected to the lifting chain (42). Multiple support blocks (44) are fixedly installed at equal intervals on the lifting chain (42). The support blocks (44) have grooves that cooperate with the shaft (741). The spacing between adjacent support blocks (44) is the same as the layer spacing of adjacent drying channels. A guide rail (43) is also fixedly installed on the vertical rail (3). The support blocks (44) slide in contact with the guide rail (43), so that the support blocks (44) can move vertically along the rail.

9. The multi-layer track-type tobacco drying structure according to claim 8, characterized in that, The equidistant retraction and extension assembly (5) includes a first sprocket drive assembly (51), a first main chain (52) and a first secondary chain (53). The first sprocket drive assembly (51) is fixedly installed on the frame (1). The output end of the first sprocket drive assembly (51) is driven and connected to the first main chain (52). The pull tabs (743) of adjacent drying and folding units (7) on the drying channel are fixedly connected through the first secondary chain (53). The first main chain (52) is fixedly connected to the pull tabs (743) of the drying and folding units (7) at the end of the drying channel.

10. The multi-layer track-type tobacco drying structure according to claim 9, characterized in that, The synchronous angle-changing component (6) includes a second sprocket drive component (61), a second main chain (62), and a second auxiliary chain (63). There are two second sprocket drive components (61) and they are distributed on the upper and lower sides of the first sprocket drive component (51). The second sprocket drive component (61) is fixedly connected to the frame (1). The output end of the second sprocket drive component (61) is fixedly connected to a second main chain (62). The hanging head (734) of the adjacent drying folding unit (7) on the drying channel is fixedly connected through the second auxiliary chain (63). The second main chains (62) on the upper and lower sides are fixedly connected to the hanging head (734) on the upper and lower sides of the drying folding unit (7) at the end of the drying channel.

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