An air purification system for a pre-prepared food processing workshop

Abstract

This invention discloses an air purification system for a pre-prepared food processing workshop, comprising an exhaust duct located at the top of the workshop and an air supply duct located at the bottom. An outdoor unit is installed outside the workshop, comprising a flue gas purification unit connected to the exhaust duct for purifying flue gas, and an air purification unit connected to the air supply duct for purifying outside air. This invention relates to the field of air purification system technology, which ensures excellent air quality in the processing workshop while resulting in a low overall system failure rate and short maintenance time, making it particularly suitable for air purification in food processing workshops.

Description

Technical Field

[0001] This invention relates to the field of air purification system technology, specifically an air purification system for a pre-prepared food processing workshop. Background Technology

[0002] During the production and processing of pre-prepared dishes, a large amount of oily fumes are generated, filling the workshop. These fumes deteriorate the air quality, affecting the working environment of employees and contaminating the dishes. Therefore, air purification in the workshop is necessary. Currently, the best purification methods are using a central air conditioning fresh air system or built-in air purifiers. However, these methods still have the following problems:

[0003] When a central air conditioning fresh air system is used for purification, the system cannot remove the oil and odor from the fumes because they contain a lot of oil and have a pungent smell. This not only causes serious wear and tear on the filters in the fresh air system, but also results in polluting the exhaust air.

[0004] When choosing a built-in air purifier, not only is a large number of air purifiers required, but the air purification effect is also not obvious.

[0005] Therefore, an air purification system specifically designed for workshops with oily fumes is needed. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide an air purification system that can ensure excellent air quality in the processing workshop, and has a low overall system failure rate and short maintenance time.

[0007] The technical solution adopted by the present invention to achieve the above objectives is: an air purification system for a pre-prepared food processing workshop, including an exhaust duct located at the top of the processing workshop and an air supply duct located at the bottom of the processing workshop, wherein an outdoor unit is provided outside the processing workshop;

[0008] The outdoor unit includes a flue gas purification outdoor unit connected to the exhaust duct for purifying flue gas, and an air purification outdoor unit connected to the supply duct for purifying outside air.

[0009] In the above technical solution, the flue gas purification outdoor unit includes a smoke extraction fan for extracting flue gas, an electrostatic oil removal device connected to the smoke extraction fan for removing oil from the flue gas, and a flue gas purification device connected to the electrostatic oil removal device for filtering and purifying the flue gas.

[0010] The air purifier outdoor unit includes an exhaust fan for drawing in air and an air purification device connected to the exhaust fan for purifying the air.

[0011] The exhaust fan and the smoke extraction fan share a first power drive device.

[0012] In the above technical solution, the smoke extraction fan includes a first fan housing and a first fan blade rotatably connected inside the first fan housing, and a first power shaft is fixedly connected to the center of the first fan blade;

[0013] The exhaust fan includes a second fan housing and a second fan blade rotatably connected inside the second fan housing, with a second power shaft fixedly connected to the center of the second fan blade;

[0014] The first power shaft is poweredly connected to the second power shaft, and the first power drive device is poweredly connected to the first power shaft / second power shaft.

[0015] In the above technical solution, the flue gas purification device includes a flue gas purification box, a flue gas purification filter, and a first moving base. The bottom of the flue gas purification box is slidably connected to the first moving base, and a first moving platform is fixedly connected to the first moving base. A first lead screw is threadedly connected to the first moving platform, and the first lead screw is poweredly connected to a second power drive device. Multiple sets of first mounting frames are fixedly connected to the top surface of the first moving base. The flue gas purification filter is slidably connected in each set of first mounting frames. A first opening is provided on one side of the flue gas purification box, and a first sealing plate is fixedly connected to the side end of the first mounting frame corresponding to the first opening. The first sealing plate seals the first opening. A flue gas inlet is provided on one side of the flue gas purification box, and a flue gas outlet is provided on one side of the flue gas purification box. The flue gas inlet is connected to the air outlet of the electrostatic oil removal device via a pipeline, and a flue gas exhaust chimney is fixedly connected to the flue gas outlet.

[0016] In the above technical solution, the air purification device includes an air purification box, an air purification filter, and a second moving base. The bottom of the air purification box is slidably connected to the second moving base, and a second moving platform is fixedly connected to the second moving base. A second lead screw is threadedly connected to the second moving platform, and the second lead screw is poweredly connected to a third power drive device. Multiple sets of second mounting frames are fixedly connected to the top surface of the second moving base, and the air purification filter is slidably connected to each set of second mounting frames. A second opening is provided on one side of the flue gas purification box, and a second sealing plate is fixedly connected to the side end of the second mounting frame corresponding to the second opening. The second sealing plate seals the second opening. An air outlet is provided on one side of the air purification box, and an air inlet is provided on one side of the flue gas purification box. The air outlet is connected to the air inlet pipe of the exhaust fan.

[0017] In the above technical solution, a first sprocket is fixedly connected to the first power shaft, a second sprocket is fixedly connected to the second power shaft, and the first sprocket and the second sprocket are connected by a first chain;

[0018] A third sprocket is fixedly connected to the first power shaft / second power shaft, and a fourth sprocket is fixedly connected to the power output shaft of the first power drive device. The third sprocket and the fourth sprocket are connected through a second sprocket.

[0019] In another embodiment, the second and third power drive devices are not provided. The first lead screw and the second lead screw are fixedly connected by a coupling. A ratchet assembly is fixedly connected to the ends of the first lead screw / second lead screw. An extension shaft is fixedly connected to the power output shaft of the first power drive device. The extension shaft is poweredly connected to the ratchet assembly, so that when the first power drive device rotates in the forward direction, the first lead screw and the second lead screw do not rotate under the action of the ratchet assembly. When the first power drive device rotates in the reverse direction, the first lead screw and the second lead screw rotate under the action of the ratchet assembly. When the first lead screw and the second lead screw rotate, the first motion table and the second motion table move in a direction away from / close to each other.

[0020] In the above technical solution, the ratchet assembly includes an outer disc, an inner disc, and pawls. The outer disc has a rotating cavity, and multiple sets of ratchet teeth are fixedly connected to the inner wall of the rotating cavity. The inner disc is located inside the rotating cavity, and multiple sets of pawls are rotatably connected to the inner disc. An elastic element is fixedly connected to each set of pawls on the inner disc. The elastic element is fixedly connected to the pawl, and the pawls abut against the ratchet teeth. A worm gear ring is fixedly connected to the outer disc, and a worm is provided on the extension shaft corresponding to the worm gear ring. The worm meshes with the worm gear ring, and the outer disc is fixedly connected to the first lead screw / second lead screw.

[0021] The beneficial effects of this invention are:

[0022] 1. The exhaust fan draws the oil fumes generated inside the processing workshop into the electrostatic precipitator, where the oil is collected. The fumes then enter the flue gas purification device, where particulate matter and odors are filtered out by the filter before being released into the atmosphere. This prevents the fumes from directly polluting the air. Simultaneously, the exhaust fan draws outside air into the air purification device, where dust and odors are filtered out by the filter. The clean air is then released into the processing workshop. This continuous air circulation, with the exhaust of oil fumes and the intake of clean air, ensures excellent air quality within the processing workshop.

[0023] 2. The first moving base can be linearly moved by rotating the first lead screw, and then the first moving base, together with the flue gas purification filter, can slide out from the first opening, so that the flue gas purification filter can be replaced. Similarly, the second moving base can be linearly moved by rotating the second lead screw, and then the second moving base, together with the air purification filter, can slide out from the second opening, so that the air purification filter can be replaced. The flue gas purification filter and the air purification filter are installed on the first mounting frame and the second mounting frame by sliding installation. Overall, the replacement of the flue gas purification filter and the air purification filter is very simple and convenient, thereby saving maintenance time of the outdoor unit.

[0024] 3. The first power drive device can provide power to the smoke extraction fan and the exhaust fan, and can also be combined with the ratchet assembly to provide power to the first lead screw and the second lead screw. This reduces the number of power drive devices required, thereby reducing the failure rate of external equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the external equipment in this invention;

[0027] Figure 3 for Figure 2 Detailed structural diagram of part A0 in the middle;

[0028] Figure 4 This is a front view schematic diagram of the external device in this invention;

[0029] Figure 5 This is a schematic cross-sectional view of the air purification device in this invention;

[0030] Figure 6 This is a schematic diagram of the connection structure of the second motion platform in this invention;

[0031] Figure 7 This is a schematic cross-sectional view of the smoke extraction fan in this invention;

[0032] Figure 8 This is a schematic cross-sectional view of the exhaust fan in this invention;

[0033] Figure 9 This is a schematic cross-sectional view of the flue gas purification device in this invention;

[0034] Figure 10 This is a schematic diagram of the connection structure of the first motion platform in this invention.

[0035] In the diagram: 1. Processing workshop; 2. Exhaust duct; 3. Air supply duct; 4. Flue gas purification outdoor unit; 5. Air purification outdoor unit; 6. Exhaust fan; 7. Electrostatic oil removal device; 8. Flue gas purification device; 9. Exhaust fan; 10. Air purification device; 11. First power drive device; 12. First fan housing; 13. First fan blade; 14. First power shaft; 15. Second fan housing; 16. Second fan blade; 17. First sprocket; 18. Second sprocket; 19. First chain; 20. Fourth sprocket; 21. Third sprocket; 22. Second sprocket; 23. First motion base; 24. First motion platform; 25. ... 26. Lead screw, 27. Second power drive device, 28. First mounting frame, 29. Flue gas purification box, 30. Flue gas purification filter, 31. First sealing plate, 32. Exhaust chimney, 33. Air purification box, 34. Air purification filter, 35. Second motion base, 36. Second motion table, 37. Second lead screw, 38. Third power drive device, 39. Second mounting frame, 40. Second sealing plate, 41. Air inlet, 42. Coupling rod, 43. Ratchet assembly, 44. Extension shaft, 45. Outer disc, 46. Inner disc, 47. Ratchet tooth, 48. Worm gear ring, 49. Worm, 40. Second power shaft. Detailed Implementation

[0036] 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.

[0037] Example 1

[0038] Please see Figure 1 , Figure 2 , Figure 7 , Figure 8An air purification system for a pre-prepared food processing workshop includes an exhaust duct 2 located at the top of the processing workshop 1 and an air supply duct 3 located at the bottom of the processing workshop 1. Additionally, outdoor units are installed outside the processing workshop 1, including a flue gas purification outdoor unit 4 and an air purification outdoor unit 5. Specifically, the flue gas purification outdoor unit 4 includes an exhaust fan 6 for extracting flue gas, an electrostatic grease remover 7 connected to the exhaust fan 6 for removing oil from the flue gas, and a flue gas purification device 8 connected to the electrostatic grease remover 7 for filtering and purifying the flue gas. After connecting the exhaust fan 6 to the exhaust duct 2, the exhaust fan 6 can draw the oil fumes generated inside the processing workshop 1 into the electrostatic grease remover 5. The oil removal device 7 removes oil stains from the fumes using an electrostatic precipitator 7. The oil-removed fumes can then enter the fume purification device 8, which purifies the particulate matter and odors in the fumes before finally discharging them into the atmosphere. Meanwhile, the outdoor air purification unit 5 includes an exhaust fan 9 for drawing in air and an air purification device 10 connected to the exhaust fan 9 for purifying the air. In this way, the exhaust fan 9 draws outside air into the air purification device 10, which filters dust from the air. The clean air is then discharged into the processing workshop 1. This cycle of fume exhaust and air intake ensures excellent air quality inside the workshop.

[0039] In this embodiment, the exhaust fan 9 and the smoke extraction fan 6 share a first power drive device 11, that is, the first power drive device 11 provides power to both the exhaust fan 9 and the smoke extraction fan 6, thereby generating a negative pressure effect. Specifically, the smoke extraction fan 6 includes a first fan housing 12 and a first fan blade 13 rotatably connected inside the first fan housing 12. The center of the first fan blade 13 is fixedly connected to a first power shaft 14. The exhaust fan 9 includes a second fan housing 15 and a second fan blade 16 rotatably connected inside the second fan housing 15. The center of the second fan blade 16 is fixedly connected to a second power shaft 49. The first power shaft 14 and the second power shaft 49 are powered together. The first power drive device 11 is powered together with either the first power shaft 14 or the second power shaft 49. In this way, the first power drive device 11 can drive the first fan blade 13 and the second fan blade 16 to rotate. Due to the different installation structures of the first fan blade 13 and the second fan blade 16, the smoke extraction fan 6 generates outward negative pressure, while the exhaust fan 9 generates inward negative pressure.

[0040] In this embodiment, a first sprocket 17 is fixedly connected to the first power shaft 14, and a second sprocket 2218 is fixedly connected to the second power shaft 49. The first sprocket 17 and the second sprocket 2218 are connected by a first chain 19. At the same time, a third sprocket 21 is fixedly connected to either the first power shaft 14 or the second power shaft 49. A fourth sprocket 20 is fixedly connected to the power output shaft of the first power drive device 11. The third sprocket 21 and the fourth sprocket 20 are connected by a second sprocket 2218. This achieves the power connection between the first power shaft 14 and the second power shaft 49, as well as the power connection between the first power shaft 14 / second power shaft 49 and the first power drive device 11. Of course, the sprockets and chains mentioned above can be replaced with pulleys and drive belts.

[0041] Example 2

[0042] Please see Figure 5 , Figure 6 , Figure 9 , Figure 10 An air purification system for a pre-prepared food processing workshop is basically the same as that in Embodiment 1. This embodiment provides a flue gas purification device 8 and an air purification device 10.

[0043] In this embodiment, the flue gas purification device 8 includes a flue gas purification box 28, a flue gas purification filter 29, and a first moving base 23. The bottom of the flue gas purification box 28 is slidably connected to the first moving base 23, and a first moving platform 24 is fixedly connected to the first moving base 23. A first lead screw 25 is threadedly connected to the first moving platform 24, and the first lead screw 25 is powered by a second power drive device 26. The second power drive device 26 can drive the first lead screw 25 to rotate, thereby causing the moving base to move linearly. Multiple sets of first mounting frames 27 are fixedly connected to the top surface of the first moving base 23, and a flue gas purification filter 29 is slidably connected within each set of first mounting frames 27. The flue gas purification box 28 has a first opening on one side. A first sealing plate 30 is fixedly connected to the side end of the mounting frame corresponding to the first opening. The first sealing plate 30 seals the first opening. When the first moving base 23 moves linearly, it can drive the first mounting frame 27 and the flue gas purification filter 29 to move linearly, so that the first mounting frame 27 and the flue gas purification filter 29 can pass through the first opening, which makes it convenient to replace the flue gas purification filter 29. The flue gas purification box 28 also has a flue gas inlet on one side and a flue gas outlet on one side. The flue gas inlet is connected to the air outlet of the electrostatic oil removal device 7 by a pipeline, and the flue gas outlet is fixedly connected to the exhaust chimney 31.

[0044] In this embodiment, the air purification device 10 includes an air purification box 32, an air purification filter 33, and a second motion base 34. The bottom of the air purification box 32 is slidably connected to the second motion base 34, and a second motion platform 35 is fixedly connected to the second motion base 34. A second lead screw 36 is threadedly connected to the second motion platform 35, and the second lead screw 36 is poweredly connected to a third power drive device 37. The third power drive device 37 can drive the second lead screw 36 to rotate, thereby causing the second motion base 34 to move linearly. Multiple sets of second mounting frames 38 are fixedly connected to the top surface of the second motion base 34, and each set of second mounting frames 38 has a sliding... An air purification filter 33 is connected to the air purification box 32. A second opening is provided on one side of the air purification box 32. A second sealing plate 39 is fixedly connected to the side end of the second mounting frame 38 corresponding to the second opening. The second sealing plate 39 seals the second opening. When the second moving base 34 moves linearly, it can move linearly together with the second mounting frame 38 and the air purification filter 33, so that the second mounting frame 38 and the air purification filter 33 can pass through the second opening, thereby replacing the air purification filter 33. An air outlet is provided on one side of the air purification box 32, and an air inlet 40 is provided on one side of the flue gas purification box 28. The air outlet is connected to the air inlet pipe of the exhaust fan 9.

[0045] Example 3

[0046] Please see Figure 2 , Figure 3 , Figure 4 An air purification system for a pre-prepared food processing workshop, further optimized from Embodiment 2, omits the second power drive device 26 and the third power drive device 37 from Embodiment 2. Instead, the first lead screw 25 and the second lead screw 36 are fixedly connected via a coupling rod 41. A ratchet assembly 42 is fixedly connected to the other end of either the first lead screw 25 or the second lead screw 36. An extension shaft 43 is fixedly connected to the power output shaft of the first power drive device 11, and the extension shaft 43 is poweredly connected to the ratchet assembly 42. This ensures that when the first power drive device rotates forward, the first lead screw 25 and the second lead screw 36 do not rotate under the action of the ratchet assembly 42. When the first power drive device rotates forward, the first lead screw 25 and the second lead screw 36 do not rotate. When the power drive device rotates in the reverse direction, the first lead screw 25 and the second lead screw 36 rotate under the action of the ratchet assembly 42. When the first lead screw 25 and the second lead screw 36 rotate, the first motion table 24 and the second motion table 35 move away from or towards each other. In this way, the first power drive device 11 can synchronously drive the first lead screw 25 and the second lead screw 36 to rotate, so that the flue gas purification screen in the flue gas purification device 8 and the air purification screen in the air purification device 10 can be passed to the outside for replacement. This reduces the number of two sets of power drive devices, and the service life of the mechanical parts is longer, which reduces the failure rate of the outdoor equipment.

[0047] In this embodiment, the ratchet assembly 42 includes an outer disc 44, an inner disc 45, and pawls. The outer disc 44 has a rotating cavity, and multiple sets of ratchet teeth 46 are fixedly connected to the inner wall of the rotating cavity. The inner disc 45 is located inside the rotating cavity, and multiple sets of pawls are rotatably connected to it. An elastic element is fixedly connected to each set of pawls on the inner disc 45, and the elastic element is fixedly connected to the pawl. The pawls abut against the ratchet teeth 46. A worm gear ring 47 is fixedly connected to the outer disc 44. Here, the worm gear ring 47 is an annular outer ring with worm gear teeth located outside the annular outer ring. A worm 48 is provided on the extension shaft 43 corresponding to the worm gear ring 47. The rod 48 is meshed with the worm gear ring 47, and the outer disc 44 is fixedly connected to the first lead screw 25 or the second lead screw 36. When the first power drive device 11 drives the extension shaft 43 to rotate in the forward direction, the worm 48 drives the worm gear ring 47 to rotate, which in turn causes the outer disc 44 to rotate in the forward direction. At this time, the inner disc does not rotate, which also causes the first lead screw 25 and the second lead screw 36 to not rotate. When the first power drive device 11 drives the extension shaft 43 to rotate in the reverse direction, the worm 48 drives the worm gear ring 47 to rotate, which in turn causes the outer disc 44 to rotate in the reverse direction. At this time, the inner disc rotates.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An air purification system for a pre-prepared food processing workshop, characterized in that: Includes an exhaust duct (2) located at the top of the processing workshop (1) and an air supply duct (3) located at the bottom of the processing workshop (1), and the processing workshop (1) is equipped with an external unit. The outdoor unit includes a flue gas purification outdoor unit (4) connected to the exhaust duct (2) for purifying flue gas, and an air purification outdoor unit (5) connected to the air supply duct (3) for purifying outside air. The flue gas purification outdoor unit (4) includes a smoke extraction fan (6) for extracting flue gas, an electrostatic oil removal device (7) connected to the smoke extraction fan (6) for removing oil from the flue gas, and a flue gas purification device (8) connected to the electrostatic oil removal device (7) for filtering and purifying the flue gas. The air purification outdoor unit (5) includes an exhaust fan (9) for drawing in air and an air purification device (10) connected to the exhaust fan (9) for purifying the air. The exhaust fan (9) and the smoke extraction fan (6) share a first power drive device (11). The flue gas purification device (8) includes a flue gas purification box (28), a flue gas purification filter (29), and a first moving base (23). The bottom of the flue gas purification box (28) is slidably connected to the first moving base (23). A first moving platform (24) is fixedly connected to the first moving base (23). A first lead screw (25) is threadedly connected to the first moving platform (24). Multiple sets of first mounting frames (27) are fixedly connected to the top surface of the first moving base (23). The flue gas purification filter (29) is slidably connected in each set of first mounting frames (27). The air purification device (10) includes an air purification box (32), an air purification filter (33), and a second motion base (34). The bottom of the air purification box (32) is slidably connected to the second motion base (34). A second motion platform (35) is fixedly connected to the second motion base (34). A second lead screw (36) is threadedly connected to the second motion platform (35). Multiple sets of second mounting frames (38) are fixedly connected to the top surface of the second motion base (34). The air purification filter (33) is slidably connected to each set of second mounting frames (38). The first lead screw (25) and the second lead screw (36) are fixedly connected by a coupling rod (41). The ends of the first lead screw (25) and the second lead screw (36) are fixedly connected to a ratchet assembly (42). An extension shaft (43) is fixedly connected to the power output shaft of the first power drive device (11). The extension shaft (43) is poweredly connected to the ratchet assembly (42), so that when the first power drive device (11) rotates in the forward direction, the first lead screw (25) and the second lead screw (36) do not rotate under the action of the ratchet assembly (42). When the first power drive device (11) rotates in the reverse direction, the first lead screw (25) and the second lead screw (36) rotate under the action of the ratchet assembly (42). When the first lead screw (25) and the second lead screw (36) rotate, the first motion table (24) and the second motion table (35) move in a direction away from each other / closer to each other.

2. The air purification system for a pre-prepared food processing workshop according to claim 1, characterized in that: The smoke extraction fan (6) includes a first fan housing (12) and a first fan blade (13) rotatably connected inside the first fan housing (12), and a first power shaft (14) is fixedly connected to the center of the first fan blade (13). The exhaust fan (9) includes a second fan housing (15) and a second fan blade (16) rotatably connected inside the second fan housing (15), with a second power shaft (49) fixedly connected to the center of the second fan blade (16). The first power shaft (14) is powered to the second power shaft (49), and the first power drive device (11) is powered to the first power shaft (14) / second power shaft (49).

3. The air purification system for a pre-prepared food processing workshop according to claim 1, characterized in that: The flue gas purification box (28) has a first opening on one side. The first mounting frame (27) is fixedly connected to the side end of the first opening with a first sealing plate (30). The first sealing plate (30) seals the first opening. The flue gas purification box (28) has a flue gas inlet on one side and a flue gas outlet on one side. The flue gas inlet is connected to the air outlet of the electrostatic oil removal device (7) by a pipeline. The flue gas outlet is fixedly connected to a smoke exhaust chimney (31).

4. The air purification system for a pre-prepared food processing workshop according to claim 3, characterized in that: The flue gas purification box (28) has a second opening on one side. The second mounting frame (38) is fixedly connected to the side end of the second opening with a second sealing plate (39). The second sealing plate (39) seals the second opening. The air purification box (32) has an air outlet on one side. The flue gas purification box (28) has an air inlet (40) on one side. The air outlet is connected to the air inlet pipe of the exhaust fan (9).

5. An air purification system for a pre-prepared food processing workshop according to claim 2, characterized in that: A first sprocket (17) is fixedly connected to the first power shaft (14), and a second sprocket (22) (18) is fixedly connected to the second power shaft (49). The first sprocket (17) and the second sprocket (22) (18) are connected by a first chain (19). A third sprocket (21) is fixedly connected to the first power shaft (14) / second power shaft (49), and a fourth sprocket (20) is fixedly connected to the power output shaft of the first power drive device (11). The third sprocket (21) and the fourth sprocket (20) are connected by a second sprocket (22) (18).

6. The air purification system for a pre-prepared food processing workshop according to claim 1, characterized in that: The ratchet assembly (42) includes an outer disc (44), an inner disc (45), and pawls. The outer disc (44) has a rotating cavity, and multiple sets of ratchet teeth (46) are fixedly connected to the inner wall of the rotating cavity. The inner disc (45) is located inside the rotating cavity. Multiple sets of pawls are rotatably connected to the inner disc (45). An elastic element is fixedly connected to each set of pawls on the inner disc (45). The elastic element is fixedly connected to the pawl. The pawls abut against the ratchet teeth (46). A worm gear ring (47) is fixedly connected to the outer disc (44). A worm (48) is provided on the extension shaft (43) corresponding to the worm gear ring (47). The worm (48) meshes with the worm gear ring (47). The outer disc (44) is fixedly connected to the first lead screw (25) / second lead screw (36).

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