Automatic lifting structure of fruit and vegetable dryer

Abstract

The automatic lifting structure of the fruit and vegetable drying machine comprises a frame body, a front tobacco carrying beam, a middle tobacco carrying beam and a rear tobacco carrying beam are arranged in the frame body, each tobacco carrying beam comprises a first tobacco carrying beam body, a second tobacco carrying beam body and a third tobacco carrying beam body, and the first tobacco carrying beam body, the second tobacco carrying beam body and the third tobacco carrying beam body are sequentially arranged on the frame body from bottom to top; a bottom beam fixedly connected to the frame body is arranged below each tobacco carrying beam, a lifting mechanism for driving the three tobacco carrying beams to synchronously move up and down along the frame body is arranged in the frame body, and a plurality of locking mechanisms are arranged on the second tobacco carrying beam and the third tobacco carrying beam; by means of the movable pulley, the first fixed pulley, the second fixed pulley, the third fixed pulley, the six ropes and the lifting mechanism, rapid lifting of the multiple layers of tobacco carrying beams is achieved, convenience is improved when workers lay multiple layers of tobacco leaves, and the working efficiency of the workers is further improved.

Description

Technical Field

[0001] This invention belongs to the technical field of fruit and vegetable dryers, and relates to an automatic lifting structure for fruit and vegetable dryers. Background Technology

[0002] Currently, the main method of loading tobacco in my country's flue-cured tobacco areas is the traditional method using tobacco sticks and clips. The steps of this method mainly include: harvesting tobacco—weaving tobacco—stacking (stacking at the entrance of the curing barn)—passing the loaded tobacco—loading the tobacco. During loading and unloading, varying degrees of damage to the tobacco leaves frequently occur, reducing their quality and severely impacting the economic income of tobacco farmers. The work is labor-intensive, requiring strong male workers to complete the loading process. Accidents involving falls and fractures frequently occur when loading the top layer of tobacco, seriously affecting the personal safety of tobacco farmers.

[0003] Given the current methods of loading and unloading tobacco, and with societal development, rural labor is becoming increasingly scarce and labor costs are rising. This severely impacts tobacco farmers' enthusiasm for tobacco cultivation, preventing the achievement of easy loading, unloading, and curing of tobacco, and hindering the improvement of tobacco leaf quality.

[0004] Chinese invention patent CN108741160A discloses a drying rack for fruits and vegetables, including four support rods arranged in parallel. The bottom ends of the four support rods are fixedly connected by connecting ribs. A multi-layer quadrilateral frame is provided between the upper ends of the support rods, and the quadrilateral frames are arranged in parallel. Sliding rods are fixedly connected to the four corners of the quadrilateral frames. Slotted holes are also provided along the length of the support rods. The outer side of the sliding rods extends to the outer side of the support rods through the slotted holes, and a locking nut is screwed to the end of the sliding rod. The inner side of the locking nut is tightly attached to the corresponding support rod. Multiple partitions are fixedly connected at equal intervals on the inner sidewall of the quadrilateral frames along the length of the quadrilateral frames. A rectangular plate is also stacked on the top surface of the quadrilateral frames, and multiple through holes are provided at equal intervals on the rectangular plate. Chinese utility model patent with authorization announcement number CN216293478U discloses a shelf for the inside of a fruit and vegetable drying room, including a base, a fixed shaft at the top of the base and connected to the base, and a spring button on the upper side of the outer wall of the fixed shaft and connected to the fixed shaft. Chinese utility model patent with authorization announcement number CN208048395U discloses a mobile fruit and vegetable drying rack. The key technical points of the rack include an I-shaped track suspended by a support rod fixed to the roof, a frame-shaped frame, and pulleys located above the frame and sliding on the track. An L-shaped bracket is provided inside the frame, the bracket includes a vertical plate and a bottom plate, a tray for use with the bracket is placed on the bracket, the frame has a feed port for pushing the tray in, a slide rail is provided on the bottom plate, and rollers that roll on the slide rail are provided on both sides of the bottom surface of the tray. None of the aforementioned existing technologies have optimized the loading and unloading methods for tobacco. With the decreasing shortage of young labor in rural areas, older workers are unable to quickly load, unload, and dry tobacco, thus affecting the drying efficiency of tobacco. Summary of the Invention

[0005] To address the problem that the existing technology has not optimized the loading and unloading methods for tobacco, and that with the decreasing shortage of young rural labor, older workers are unable to quickly load, unload, and dry tobacco, thus affecting the drying efficiency, this invention proposes an automatic lifting structure for a fruit and vegetable dryer. This effectively solves the problem that the existing technology has not optimized the loading and unloading methods for tobacco, and that with the decreasing shortage of young rural labor, older workers are unable to quickly load, unload, and dry tobacco, thus affecting the drying efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an automatic lifting structure for a fruit and vegetable dryer, comprising a frame, wherein three sets of smoke-carrying beams are arranged in the frame, each set of smoke-carrying beams including a first smoke-carrying beam, a second smoke-carrying beam, and a third smoke-carrying beam. The first smoke-carrying beam, the second smoke-carrying beam, and the third smoke-carrying beam are arranged sequentially from bottom to top on the frame, and a bottom beam fixedly connected to the frame is provided below each set of smoke-carrying beams. A lifting mechanism is provided in the frame to drive the three sets of smoke-carrying beams to move up and down synchronously along the frame, and multiple locking mechanisms are provided on the second smoke-carrying beam and the third smoke-carrying beam.

[0007] Furthermore, the frame includes auxiliary frames and conversion frames arranged on the left and right. Three load-bearing frames are arranged linearly between the auxiliary frames and conversion frames. Three fixed beams are arranged linearly at the upper and lower ends of each load-bearing frame and are fixedly connected to the adjacent load-bearing frame, auxiliary frame and conversion frame. The three sets of tobacco-carrying beams are slidably connected to the load-bearing frames and are located directly below the three fixed beams. The two ends of the bottom beam are fixedly connected to the opposite sides of the auxiliary frames and conversion frames.

[0008] Furthermore, the lifting mechanism includes twelve movable pulleys disposed on the upper side of the second tobacco beam, six first fixed pulleys disposed on the lower side of the fixed beam, eight second fixed pulleys located on the front and rear sides of the intermediate load-bearing frame, six third fixed pulleys symmetrically disposed at the middle positions of the upper and lower sides of the conversion frame, and six ropes. The movable pulleys are located at the junction of the second tobacco beam and the load-bearing frame, the first fixed pulleys are located at the junction of the fixed beam and the left and right load-bearing frames, the third fixed pulleys are located at the junction of the fixed beam and the second fixed pulleys, and the six ropes pass through two third fixed pulleys. The frame is divided into three groups: front, middle, and rear. One end of the ropes in the front and rear groups passes through two second fixed pulleys, one first fixed pulley, and two movable pulleys on the same side of the same second tobacco beam, and is fixedly connected to the upper end of the middle load-bearing frame. One end of the two ropes in the middle group passes through the two first fixed pulleys on the left and right sides of the load-bearing frame, and after passing through the first fixed pulleys, the two ropes wrap around the two movable pulleys on the middle second tobacco beam and are fixedly connected to the upper end of the middle load-bearing frame. A traction assembly for pulling six ropes is provided at the bottom of the frame.

[0009] Furthermore, the traction assembly includes a winch and a six-in-one mechanism located at the bottom of the frame. The ends of the six ropes that are not fixed to the load-bearing frame pass through the third fixed pulley and the right end of the six-in-one mechanism. The left end of the six-in-one mechanism is provided with two second movable pulleys, each with a pull rope wound around it. The two ends of the pull rope are respectively connected to the winding end and the fixed end of the winch. The lower end of the load-bearing frame has a rectangular opening for the six-in-one mechanism to pass through. The lower side of the winch is provided with a pulley assembly for easy disassembly of the winch. The bottom of the frame is provided with a limiting assembly for limiting the six-in-one mechanism.

[0010] Furthermore, the pulley assembly includes a slide base fixedly connected to the ground, and a pulley bracket is provided on the lower side of the winch. The pulley bracket is slidably connected to the slide base through pulleys, and the pulley bracket can slide out from the left side of the slide base.

[0011] Furthermore, the six-in-one mechanism includes a pulley section and a rope fixing section. The rope fixing section has fixing pin plates at both the front and rear ends of its upper side, and the pulley section has two fixing pins at both the front and rear ends of its upper side. The lower ends of the fixing pins pass through the fixing pin plates and are inserted into the pulley section.

[0012] Furthermore, the limiting component includes two limiting frames and a limiting post symmetrically arranged on the front and rear sides of the six-in-one mechanism. The limiting frames have multiple rectangular holes that extend through them from front to back. The pulley part and the rope fixing part have rectangular through holes of the same size as the rectangular holes that extend through them from front to back. The limiting post can be inserted into the rectangular holes of the limiting frames and the rectangular through holes of the rope fixing part.

[0013] Furthermore, the first, second, and third smoke beams are all double-layered structures, with supporting ribs between the upper and lower layers.

[0014] Furthermore, the locking mechanism includes locking posts disposed on the second and third tobacco beams. Two fixing plates are symmetrically disposed on the side of the locking post. One end of the fixing plate is fixedly connected to the supporting rib. A locking notch is provided through the lower end of the locking post. The locking post and the load-bearing frame are located in the same plane. Multiple pin holes are provided linearly through the front and rear sides of the load-bearing frame from top to bottom. Locking pins are inserted into the pin holes. The left and right ends of the locking pins extend to the left and right sides of the load-bearing frame and are located in the locking notch.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves rapid lifting of multi-layer tobacco-carrying beams through twelve movable pulleys set on the upper side of the second tobacco-carrying beam, six first fixed pulleys set on the lower side of the fixed beam, eight second fixed pulleys located on the front and rear sides of the intermediate load-bearing frame, six third fixed pulleys symmetrically set in the middle position of the upper and lower sides of the conversion frame, and six ropes. This improves the convenience for workers when laying multi-layer tobacco leaves and further improves the work efficiency of workers. This invention achieves rapid disassembly of the winch through the separate design of the six-in-one mechanism, the pulley bracket at the bottom of the winch, and the slide base design. This allows the winch to be quickly applied to the drying of multiple frames, improving the flexibility of the winch, reducing the number of winches, and further reducing costs. This invention, through the structural principle of single-layer lifting and layered fixing of multi-layer smoke-carrying beams and locking mechanisms, greatly reduces the lifting weight and improves the reliability and stability of the device during use; by fixing the bottom beam, it achieves fall protection for workers and ensures the safety of the device during use. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the lifting mechanism of the present invention; Figure 3 This is a schematic diagram of the winch and slide base of the present invention. Figure 4 This is a perspective view of the six-in-one mechanism of the present invention; Figure 5 This is a perspective view of the locking post of the present invention; Figure 6 For the present invention Figure 1 A magnified view of part A; Figure 7 This is a perspective view of Embodiment 2 of the present invention; Figure 8 Table 1 shows the selection parameters for Embodiment 1 and Embodiment 2 of the present invention.

[0017] In the diagram: 1. Auxiliary frame; 2. Conversion frame; 3. Load-bearing frame; 4. Fixed beam; 5. First smoke beam; 6. Second smoke beam; 7. Third smoke beam; 8. Movable pulley; 9. First fixed pulley; 10. Second fixed pulley; 11. Third fixed pulley; 12. Rope; 13. Six-in-one mechanism; 131. Pulley section; 132. Rope fixing section; 133. Fixing pin plate; 134. Second movable pulley; 135. Fixing pin; 14. Winch; 15. Slide base; 16. Pull rope; 17. Limiting frame; 18. Locking post; 181. Locking notch; 19. Support rib; 20. Fixing plate; 21. Locking pin; 22. Top beam. Detailed Implementation

[0018] 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 embodiments of the present invention, and not all embodiments. 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. Example 1

[0019] An automatic lifting structure for a fruit and vegetable dryer includes a frame. The frame contains three sets of smoke-carrying beams: a front, a middle, and a rear set. Each set of smoke-carrying beams includes a first smoke-carrying beam 5, a second smoke-carrying beam 6, and a third smoke-carrying beam 7. These beams are arranged sequentially from bottom to top on the frame. Each set of smoke-carrying beams has a bottom beam fixedly connected to the frame. The frame contains a lifting mechanism that drives the three sets of smoke-carrying beams to move synchronously up and down along the frame. Multiple locking mechanisms are provided on the second smoke-carrying beam 6 and the third smoke-carrying beam 7.

[0020] In this embodiment, the frame includes auxiliary frames 1 and conversion frames 2 arranged on the left and right. Three load-bearing frames 3 are arranged linearly between the auxiliary frames 1 and conversion frames 2. Three fixed beams 4 are arranged linearly at the upper and lower ends of each load-bearing frame 3 and are fixedly connected to the adjacent load-bearing frames 3, auxiliary frames 1 and conversion frames 2. The three sets of tobacco-carrying beams are slidably connected to the load-bearing frames 3 and are located directly below the three fixed beams 4. The two ends of the bottom beam are fixedly connected to the opposite sides of the auxiliary frames 1 and conversion frames 2.

[0021] In this embodiment, the lifting mechanism includes twelve movable pulleys 8 disposed on the upper side of the second tobacco beam 6, six first fixed pulleys 9 disposed on the lower side of the fixed beam 4, eight second fixed pulleys 10 located on the front and rear sides of the intermediate load-bearing frame 3, six third fixed pulleys 11 symmetrically disposed at the middle positions of the upper and lower sides of the conversion frame 2, and six ropes 12. The movable pulleys 8 are located at the junction of the second tobacco beam 6 and the load-bearing frame 3, the first fixed pulleys 9 are located at the junction of the fixed beam 4 and the left and right load-bearing frames 3, the third fixed pulleys 11 are located at the junction of the fixed beam 4 and the second fixed pulleys 10, and the six ropes 12 pass through the two third fixed pulleys 10. The fixed pulley 11 is divided into three groups: front, middle, and rear. One end of the ropes 12 in the front and rear groups passes through two second fixed pulleys 10, a first fixed pulley 9, and two movable pulleys 8 on the same second tobacco beam 6, and is fixedly connected to the upper end of the middle load-bearing frame 3. One end of the two ropes 12 in the middle group passes through the two first fixed pulleys 9 on the left and right sides, respectively, located in the middle of the load-bearing frame 3. After passing through the first fixed pulleys 9, the two ropes 12 are wrapped around the two movable pulleys 8 on the middle second tobacco beam 6 and fixedly connected to the upper end of the middle load-bearing frame 3. A traction assembly for pulling six ropes 12 is provided at the bottom of the frame.

[0022] In this embodiment, the traction assembly includes a winch 14 and a six-in-one mechanism 13 located at the bottom of the frame. The ends of the six ropes 12 that are not fixed to the load-bearing frame 3 all pass through the third fixed pulley 11 and the right end of the six-in-one mechanism 13. The left end of the six-in-one mechanism 13 is provided with two second movable pulleys 134, and each of the two second movable pulleys 134 is wound with a pull rope 16. The two ends of the pull rope 16 are respectively connected to the winding end and the fixed end of the winch 14. The lower end of the load-bearing frame 3 is provided with a rectangular opening for the six-in-one mechanism 13 to pass through. The lower side of the winch 14 is provided with a pulley assembly for easy disassembly of the winch 14. The bottom of the frame is provided with a limiting assembly for limiting the six-in-one mechanism 13.

[0023] In this embodiment, the pulley assembly includes a slide base 15 fixedly connected to the ground, and a pulley bracket is provided on the lower side of the winch 14. The pulley bracket is slidably connected to the slide base 15 through pulleys, and the pulley bracket can slide out from the left side of the slide base 15.

[0024] In this embodiment, the six-in-one mechanism 13 includes a pulley part 131 and a rope fixing part 132. The front and rear ends of the upper side of the rope fixing part 132 are provided with fixing pin plates 133, and the front and rear ends of the upper side of the pulley part 131 are provided with two fixing pins 135. The lower end of the fixing pin 135 passes through the fixing pin plate 133 and is inserted into the pulley part 131.

[0025] In this embodiment, the limiting component includes two limiting frames 17 symmetrically arranged on the front and rear sides of the six-in-one mechanism 13 and a limiting post. The limiting frame 17 has multiple rectangular holes that extend through it from front to back. The pulley part 131 and the rope fixing part 132 have rectangular through holes that are the same size as the rectangular holes. The limiting post can be inserted into the rectangular holes of the limiting frame 17 and the rectangular through holes of the rope fixing part 132.

[0026] In this embodiment, the first smoke beam 5, the second smoke beam 6, and the third smoke beam 7 are all double-layer structures, and a supporting rib 19 is provided between the upper and lower layers.

[0027] In this embodiment, the locking mechanism includes locking posts 18 disposed on the second tobacco beam 6 and the third tobacco beam 7. Two fixing plates 20 are symmetrically disposed on the side of the locking post 18. One end of the fixing plate 20 is fixedly connected to the supporting rib 19. A locking notch 181 is provided through the lower end of the locking post 18. The locking post 18 and the load-bearing frame 3 are located in the same plane. Multiple pin holes are provided through the front and rear sides of the load-bearing frame 3 from top to bottom. Locking pins 21 are inserted into the pin holes. The left and right ends of the locking pins 21 extend to the left and right sides of the load-bearing frame 3 and are located in the locking notch 181.

[0028] When using the above embodiments: First, the workers lay the tobacco leaves on the third load of tobacco beam 7. After the third load of tobacco beam 7 is filled with tobacco leaves, the winding machine is started. The winding machine winds up the pull rope 16, which pulls the six-in-one mechanism 13 to move in the direction of the winding machine. Under the action of the first fixed pulley 9, the second fixed pulley 10, the third fixed pulley 11, the second movable pulley 134 and the movable pulley 8, the rope 12 turns multiple times to lift the first load of tobacco beam 5. While the first load of tobacco beam 5 is being lifted, it can push the second load of tobacco beam 6 and the third load of tobacco beam 7 upward. When the third load of tobacco beam 7 is lifted to the designated position, the workers insert the locking pin 21 into the pin hole in the load-bearing frame 3 and make the locking pin 21 pass through the locking notch 181 located in the locking post 18 of the third load of tobacco beam 7, thereby limiting the third load of tobacco beam 7 and preventing the third load of tobacco beam 7 from descending as the winding machine unwinds. After the third load of tobacco 7 is fixed, the staff controls the winding machine to release the rope 12, and the first load of tobacco 5 and the second load of tobacco 6 return to their original positions under gravity. Then, the staff lays tobacco leaves on the second load of tobacco 6. After it is full, the second load of tobacco 6 is sent to the designated position again in the above process and fixed by the locking pin 21 and the locking post 18. After the fixation is completed, the cable is released again by the winding machine, and the first load of tobacco beam 5 returns to its original position under gravity. Then, the workers lay tobacco leaves on the first load of tobacco beam 5. After it is full, the first load of tobacco beam 5 is also sent to the designated position by the winding machine and the rope 12. At this time, the six-in-one mechanism 13 is located at the limiting frame 17. The workers insert the limiting post into the rectangular hole of the limiting frame 17 and the rectangular through hole of the rope fixing part 132 of the six-in-one mechanism 13, thereby limiting the six-in-one mechanism 13 and preventing the six-in-one mechanism 13 from shifting under the action of the cable after it is detached from the winding machine, which would cause the first load of tobacco beam 5 to fall, thus ensuring the reliability of the device during use. After the six-in-one mechanism 13 is fixed, the staff removes the fixing pin 135 on the pulley part 131 of the six-in-one mechanism 13. At this time, the pulley part 131 of the six-in-one mechanism 13 is separated from the rope fixing part 132. The staff can use the winch 14 to retract the pull rope 16 and the pulley part 131 of the six-in-one mechanism 13 to the position of the winch 14. After retraction, the staff can slide the winch 14 to the left to disengage the winch 14 from the slide base 15. Then, the staff can pull the winch 14, the pull rope 16 and the pulley part 131 of the six-in-one mechanism 13 out of the frame and place them outside the drying room. Finally, the workers spread tobacco leaves on the bottom beam and then roasted the four layers of tobacco leaves inside the frame. Preferably, when a large layer spacing is required, the workers can move the first tobacco beam 5 and the second tobacco beam 6, and adjust the positions of the second tobacco beam 6 and the third tobacco beam 7 to increase the spacing between each layer of tobacco leaves; When the second tobacco beam 6 and the third tobacco beam 7 are combined, the workers can fix the locking post 18 on the second tobacco beam 6, and fix the second tobacco beam 6 and the third tobacco beam 7 through the locking pin 21, the locking plate and the locking hole.

[0029] The above embodiment achieves rapid lifting of multi-layer tobacco-carrying beams through twelve movable pulleys 8 set on the upper side of the second tobacco-carrying beam 6, six first fixed pulleys 9 set on the lower side of the fixed beam 4, eight second fixed pulleys 10 located on the front and rear sides of the intermediate load-bearing frame 3, six third fixed pulleys 11 symmetrically set in the middle position of the upper and lower sides of the conversion frame 2, and six ropes 12, which improves the convenience of workers when laying multi-layer tobacco leaves and further improves the work efficiency of workers. This invention greatly reduces the lifting force by using a single-layer lifting and layered fixing structural principle; by fixing the first layer, it achieves fall protection for workers.

[0030] Example 2 differs from Example 1 in that: When the present invention is used in applications below six meters, the second tobacco beam 6 and the third tobacco beam 7 in the above embodiment 1 can be replaced by a top beam 22 that is slidably connected to the opposite sides of the auxiliary frame 1 and the conversion frame 2. The load-bearing frame 3 between the auxiliary frame 1 and the conversion frame 2 can be reduced to one. The locking mechanism is provided on the top beam 22 and the first tobacco beam 5. The overall working principle and workflow in this embodiment are the same as in embodiment 1. This embodiment can be applied to relatively smaller situations compared to Embodiment 1, and its structure is simpler, making it easier to assemble and use than Embodiment 1. Staff can select either Embodiment 1 or Embodiment 2 according to the application, and can adjust the dimensions of Embodiment 1 and Embodiment 2 according to the application.

[0031] The relevant selection parameters in this invention can be found in Table 1.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic lifting structure for a fruit and vegetable dryer, including a frame, characterized in that: The frame is provided with three sets of tobacco-carrying beams: front, middle and rear. Each set of tobacco-carrying beams includes a first tobacco-carrying beam (5), a second tobacco-carrying beam (6) and a third tobacco-carrying beam (7). The first tobacco-carrying beam (5), the second tobacco-carrying beam (6) and the third tobacco-carrying beam (7) are arranged on the frame from bottom to top. Each set of tobacco-carrying beams is provided with a bottom beam fixedly connected to the frame. The frame is provided with a lifting mechanism that drives the three sets of tobacco-carrying beams to move up and down synchronously along the frame. The second tobacco-carrying beam (6) and the third tobacco-carrying beam (7) are each provided with multiple locking mechanisms.

2. The automatic lifting structure of the fruit and vegetable dryer according to claim 1, characterized in that: The frame includes auxiliary frames (1) and conversion frames (2) arranged on the left and right. Three load-bearing frames (3) are arranged linearly between the auxiliary frames (1) and conversion frames (2). Three fixed beams (4) are arranged linearly at the upper and lower ends of the load-bearing frames (3) and are fixedly connected to the adjacent load-bearing frames (3), auxiliary frames (1) and conversion frames (2). The three sets of tobacco-carrying beams are slidably connected to the load-bearing frames (3) and are located directly below the three fixed beams (4). The two ends of the bottom beam are fixedly connected to the opposite sides of the auxiliary frames (1) and conversion frames (2).

3. The automatic lifting structure of the fruit and vegetable dryer according to claim 2, characterized in that: The lifting mechanism includes twelve movable pulleys (8) on the upper side of the second tobacco beam (6), six first fixed pulleys (9) on the lower side of the fixed beam (4), eight second fixed pulleys (10) on the front and rear sides of the intermediate load-bearing frame (3), six third fixed pulleys (11) symmetrically arranged in the middle of the upper and lower sides of the conversion frame (2), and six ropes (12). The movable pulleys (8) are located at the junction of the second tobacco beam (6) and the load-bearing frame (3), the first fixed pulleys (9) are located at the junction of the fixed beam (4) and the left and right load-bearing frames (3), the third fixed pulleys (11) are located at the junction of the fixed beam (4) and the second fixed pulleys (10), and the six ropes (12) pass through the two third fixed pulleys. After the fixed pulley (11), it is divided into three groups: front, middle and rear. One end of the rope (12) of the front and rear groups passes through two second fixed pulleys (10) on the same side, a first fixed pulley (9) and two movable pulleys (8) on the same second tobacco beam (6) and is fixedly connected to the upper end of the middle load-bearing frame (3). One end of the two ropes (12) in the middle group passes through the two first fixed pulleys (9) in the middle of the load-bearing frame (3) respectively. After passing through the first fixed pulleys (9), the two ropes (12) are wrapped around the two movable pulleys (8) on the second tobacco beam (6) in the middle and fixedly connected to the upper end of the middle load-bearing frame (3). The bottom of the frame is provided with a traction assembly for pulling six ropes (12).

4. The automatic lifting structure of the fruit and vegetable dryer according to claim 3, characterized in that: The traction assembly includes a winch (14) and a six-in-one mechanism (13) located at the bottom of the frame. The ends of the six ropes (12) that are not fixed to the load-bearing frame (3) all pass through the third fixed pulley (11) and the right end of the six-in-one mechanism (13). The left end of the six-in-one mechanism (13) is provided with two second movable pulleys (134). Each of the two second movable pulleys (134) is wound with a pull rope (16). The two ends of the pull rope (16) are respectively connected to the winding end and the fixed end of the winch (14). The lower end of the load-bearing frame (3) is provided with a rectangular opening for the six-in-one mechanism (13) to pass through. The lower side of the winch (14) is provided with a pulley assembly that facilitates the disassembly of the winch (14). The bottom of the frame is provided with a limiting assembly for limiting the six-in-one mechanism (13).

5. The automatic lifting structure of the fruit and vegetable dryer according to claim 4, characterized in that: The pulley assembly includes a slide base (15) fixedly connected to the ground. A pulley bracket is provided on the lower side of the winch (14). The pulley bracket is slidably connected to the slide base (15) through pulleys, and the pulley bracket can slide out from the left side of the slide base (15).

6. The automatic lifting structure of the fruit and vegetable dryer according to claim 4, characterized in that: The six-in-one mechanism (13) includes a pulley part (131) and a rope fixing part (132). The rope fixing part (132) has fixing pin plates (133) at both the front and rear ends of its upper side. The pulley part (131) has two fixing pins (135) at both the front and rear ends of its upper side. The lower end of the fixing pin (135) passes through the fixing pin plate (133) and is inserted into the pulley part (131).

7. The automatic lifting structure of the fruit and vegetable dryer according to claim 6, characterized in that: The limiting assembly includes two limiting frames (17) symmetrically arranged on the front and rear sides of the six-in-one mechanism (13) and a limiting post. The limiting frame (17) has multiple rectangular holes that extend through it from front to back. The pulley part (131) and the rope fixing part (132) have rectangular through holes that are the same size as the rectangular holes. The limiting post can be inserted into the rectangular holes of the limiting frame (17) and the rectangular through holes of the rope fixing part (132).

8. The automatic lifting structure of the fruit and vegetable dryer according to claim 2, characterized in that: The first smoke beam (5), the second smoke beam (6) and the third smoke beam (7) are all double-layer structures, and there are supporting ribs (19) between the upper and lower layers.

9. The automatic lifting structure of the fruit and vegetable dryer according to claim 8, characterized in that: The locking mechanism includes locking posts (18) set on the second tobacco beam (6) and the third tobacco beam (7). Two fixing plates (20) are symmetrically arranged on the side of the locking post (18). One end of the fixing plate (20) is fixedly connected to the support rib (19). The lower end of the locking post (18) is provided with a locking notch (181). The locking post (18) and the load-bearing frame (3) are located in the same plane. The front and rear sides of the load-bearing frame (3) are provided with multiple pin holes in a linear fashion from top to bottom. Locking pins (21) are inserted into the pin holes. The left and right ends of the locking pins (21) extend to the left and right sides of the load-bearing frame (3) and are located in the locking notch (181).

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