Fruit and vegetable rapid negative pressure pretreatment machine

Abstract

This invention discloses a rapid negative pressure pretreatment machine for fruits and vegetables, comprising a fixed frame and a negative pressure chamber. The negative pressure chamber is fixedly installed inside the fixed frame. A cold air assembly is installed at the bottom of the inner wall of the fixed frame, and a conveyor belt is fixedly installed near the top of the inner wall of the fixed frame to transport fruits and vegetables into the negative pressure chamber. A reciprocating moving assembly is fixedly installed on the conveyor belt. This invention solves the problems of uneven precooling and blind spots in existing negative pressure pretreatment machines for fruits and vegetables. Through the linkage design of the reciprocating moving assembly and the cold air assembly, combined with the flipping action of the lever, two sets of symmetrically arranged cold air nozzles are located at the top and bottom of the conveyor belt, respectively. With the reciprocating swing and linear movement, and the lever flipping the fruits and vegetables, the upper and lower surfaces, sides, and contact parts of the fruits and vegetables can be fully contacted with the cold air, ensuring uniform cooling of the same batch of fruits and vegetables. This solves the problems of large differences in cooling rate and poor negative pressure treatment effect caused by traditional precooling.

Description

Technical Field

[0001] This invention relates to the field of fruit and vegetable pretreatment technology, and in particular to a rapid negative pressure pretreatment machine for fruits and vegetables. Background Technology

[0002] Rapid negative pressure pretreatment machines for fruits and vegetables are widely used in the post-harvest processing of fruits and vegetables. Their core structure typically includes a conveyor belt system and a negative pressure vacuum chamber. During normal operation, the fruits and vegetables to be processed are continuously fed into the sealed negative pressure vacuum chamber via the conveyor belt. The chamber is connected to a vacuum pump and other air extraction devices, which can quickly reduce the pressure inside the chamber, causing the micropores on the surface of the fruits and vegetables to open and the internal gas and moisture to escape. This effectively removes unbound water from the surface, destroys the surface wax layer, or opens the pore channels, creating favorable conditions for subsequent processes such as soaking, color protection, quick freezing, or drying. Due to its advantages such as fast processing speed and suitability for assembly line operations, this type of equipment has been widely used in the fruit and vegetable processing industry.

[0003] In practical production applications, the aforementioned negative pressure pretreatment equipment usually requires a pre-cooling process before fruits and vegetables enter the vacuum chamber to reduce their respiration intensity and surface temperature, thereby improving the negative pressure treatment effect and extending the shelf life. The common existing pre-cooling method is to install a cold air direct blowing device above or to the side of the conveyor belt, that is, to continuously blow low-temperature airflow onto the surface of fruits and vegetables during the conveying process. However, since most fruits and vegetables on the conveyor belt are statically laid flat or only move in a straight line with the conveyor belt, the cold airflow can often only directly blow onto the upper surface or the windward side of the fruits and vegetables, while the lower surface, the leeward side, and the contact area between adjacent fruits are difficult to be effectively covered by the cold air. This results in significant differences in the cooling rate of different parts of the same batch of fruits and vegetables, and the overall pre-cooling effect is uneven and insufficient. The core temperature inside the fruit drops slowly. When such unevenly pre-cooled fruits and vegetables enter the negative pressure vacuum chamber, the inconsistent surface temperature and internal temperature gradient can easily cause problems such as uneven water evaporation rate, tissue stress damage, and even local browning, thus affecting the overall efficiency of negative pressure pretreatment and the quality of the final product.

[0004] Therefore, how to provide a rapid negative pressure pretreatment machine for fruits and vegetables is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One objective of this invention is to provide a rapid negative pressure pretreatment machine for fruits and vegetables, which solves the problems mentioned in the background art.

[0006] According to an embodiment of the present invention, a rapid negative pressure pretreatment machine for fruits and vegetables includes a fixed frame and a negative pressure chamber. The negative pressure chamber is fixedly installed inside the fixed frame. A cold air assembly is provided at the bottom of the inner wall of the fixed frame. A conveyor belt for conveying fruits and vegetables into the negative pressure chamber is fixedly installed near the top of the inner wall of the fixed frame. A reciprocating component is fixedly installed on the conveyor belt. One end of the cold air assembly is fixedly connected to the reciprocating component and delivers cold air onto the reciprocating component. A drive motor for providing power to the reciprocating component is fixedly installed at the top of the fixed frame via a motor bracket. A cold air nozzle for reciprocating pre-cooling fruits and vegetables is fixedly installed on the reciprocating component facing the conveyor belt. A control box for controlling the cold air assembly, the conveyor belt, and the negative pressure chamber is fixedly installed at the bottom of the inner wall of the fixed frame near the cold air assembly.

[0007] The cooling assembly includes a refrigeration compressor, a cooler, and a connecting pipe. The refrigeration compressor and the cooler are respectively fixedly installed at the bottom of the inner wall of the fixed frame and staggered from each other. The refrigeration compressor and the cooler are fixedly connected by a pipe, and the bottom end of the connecting pipe is fixedly connected to the output end of the cooler.

[0008] The connecting pipe includes a T-shaped rigid pipe and a flexible flexible pipe. The bottom end of the T-shaped rigid pipe is fixedly connected to the output end of the air cooler, and the top end of the T-shaped rigid pipe is fixedly connected to one end of the flexible flexible pipe.

[0009] The reciprocating assembly includes a mounting side plate, a reciprocating moving frame, a sliding plate, a linkage rod, a side sliding tube, a main pipe, a support frame, a positioning shaft, a crank, a reciprocating drive head, a reciprocating slot, and a telescopic assembly. The mounting side plate is bolted to the top of the conveyor belt. The support frame is fixedly mounted to the top of the mounting side plate. The positioning shaft is fixedly mounted to the top of the support frame. The telescopic assembly is rotatably mounted at both ends of the positioning shaft. One end of the linkage rod is rotatably connected to the side of the telescopic assembly. The reciprocating moving frame is slidably connected to the top of the mounting side plate, and both ends of the reciprocating moving frame extend to both sides of the conveyor belt. The sliding plate is fixedly mounted. At one end of the reciprocating frame, the other end of the linkage rod away from the telescopic assembly is rotatably connected to the end face of the sliding plate. One end of the flexible hose is fixedly connected to and communicates with the end face of the side sliding tube. The side sliding tube is fixedly installed on the end face of the telescopic assembly. One end of the side sliding tube is fixedly connected to the end face of the main pipe. The air nozzle is fixedly installed on the surface of the main pipe facing the conveyor belt. The crank is fixedly installed on the output shaft end of the drive motor. The reciprocating drive head is fixedly installed on the lower surface of the crank away from the output shaft of the drive motor. The reciprocating slot is opened on the surface of the reciprocating frame. The reciprocating drive head is movably inserted into the inside of the reciprocating slot.

[0010] The reciprocating motion assembly also includes a guide bar and a guide groove. The guide bar is fixedly installed on the side of the conveyor belt, and the guide groove is opened on the inner side of the sliding plate. The guide bar is movably installed inside the guide groove.

[0011] The reciprocating assembly also includes a straight groove guide opening, which is opened on the surface of the mounting side plate. The side sliding tube is slidably connected inside the straight groove guide opening. The telescopic assembly includes a telescopic rod and a sleeve plate. The telescopic rod is rotatably sleeved on the surface of the positioning shaft, and the sleeve plate is rotatably sleeved on the surface of the side sliding tube. One end of the telescopic rod is movably inserted into the inside of the sleeve plate, and the end of the linkage rod away from the sliding plate is rotatably connected to the side of the sleeve plate.

[0012] The number of linkage rods, straight groove guide ports, side sliding pipes, main pipes, support frames, telescopic rods, sleeves, positioning shafts, and cold air nozzles are all in two sets. The two sets of linkage rods, straight groove guide ports, side sliding pipes, main pipes, support frames, telescopic rods, sleeves, positioning shafts, and cold air nozzles are arranged symmetrically with the reciprocating moving frame as the axis of symmetry. Each set contains two linkage rods, straight groove guide ports, side sliding pipes, main pipes, support frames, telescopic rods, sleeves, positioning shafts, and cold air nozzles. Each set contains two linkage rods, straight groove guide ports, side sliding pipes, and... The main pipe, support frame, telescopic rod, sleeve plate, positioning shaft, and air nozzle are arranged symmetrically with the sliding plate as the axis of symmetry. There are two sets of sliding plates, which are fixedly installed at both ends of the reciprocating moving frame. The reciprocating moving frame is designed in an "n" shape. Two sets of straight groove guide ports are respectively opened on the surface of the conveyor belt and the mounting side plate. One set of positioning shafts is fixedly installed on the support frame, and the other set of positioning shafts is fixedly installed on the side of the conveyor belt. The telescopic component swings back and forth around the positioning shaft, driving the side sliding tube to move back and forth along the straight groove guide port.

[0013] The conveyor belt is a conveyor mesh belt. Fruits and vegetables are laid flat on the surface of the conveyor mesh belt. In each group of side sliding pipes, main pipes and cold air nozzles, one side sliding pipe, main pipe and cold air nozzle is located inside the conveyor belt and at the bottom of the upper half of the conveyor mesh belt and the fruits and vegetables. The other side sliding pipe, main pipe and cold air nozzle is located at the top of the upper half of the conveyor mesh belt and the fruits and vegetables. The cold air nozzles in each group deliver cold air towards the fruits and vegetables.

[0014] A guide rail is fixedly installed on the lower surface of the reciprocating moving frame at a position offset from the reciprocating slot. A guide plate is slidably connected to the surface of the guide rail. A side wave plate is fixedly installed on the inner wall of the conveyor belt at a position corresponding to the guide plate. The end face of the guide plate is movably connected to the inner side of the side wave plate. A lever for moving fruits and vegetables is fixedly installed at the bottom end of the guide plate.

[0015] The guide plate has side rollers rotatably mounted on its end face. The side rollers are connected to the surface of the side corrugated plate. There are two sets of side corrugated plates, which are symmetrically installed on both sides of the inner wall of the conveyor belt. There are also two sets of side rollers. When one side roller is located at the trough of one set of side corrugated plates, the other side roller is located at the crest of the other set of side corrugated plates. A sterilizing agent spraying system is fixedly installed at the inlet of the negative pressure box. Another ozone sterilization system for sterilizing fruits and vegetables is installed at the top of the inner wall of the fixed frame. A water trap is fixedly installed at the top of the inner wall of the fixed frame corresponding to the negative pressure box to receive and condense water vapor inside the negative pressure box. A humidifier system is fixedly installed on the fixed frame near the water trap. A vacuum pump for evacuating the negative pressure box is fixedly installed at the top of the negative pressure box.

[0016] The beneficial effects of this invention are: This invention effectively solves the problems of uneven precooling and blind spots in existing negative pressure pretreatment machines for fruits and vegetables. Through the linkage design of the reciprocating moving component and the cold air component, combined with the flipping action of the lever, two sets of symmetrically arranged cold air nozzles are located at the top and bottom of the conveyor belt, respectively. With the reciprocating swing and linear movement, and the lever flipping the fruits and vegetables, the upper and lower surfaces, sides and contact parts of the fruits and vegetables can be fully contacted with the cold air, ensuring uniform cooling of the same batch of fruits and vegetables. This solves the problems of large differences in cooling rate and poor negative pressure treatment effect caused by traditional precooling.

[0017] The device structure of this invention is reasonably designed and adaptable to the needs of assembly line operations. The control box enables automated operation of the equipment and facilitates flexible operation. The flexible hose has good flexibility and can adapt to the movement of reciprocating components, avoiding pipe tangling and damage, and ensuring stable cold air delivery. The side rollers can reduce wear between the guide plate and the side corrugated plate, extend the overall service life of the equipment, and reduce equipment maintenance costs.

[0018] This invention compensates for the length of the cold air nozzle by extending and retracting the telescopic component when the cold air nozzle swings, causing the side sliding tube to move back and forth along the straight groove guide opening. This causes the main pipe and the cold air nozzle to swing back and forth in parallel. Here, the distance between the cold air nozzle and the fruits and vegetables remains unchanged when the cold air nozzle swings, further improving the pre-cooling effect. Moreover, the side sliding tube and the telescopic component are fixedly set when swinging, so the side sliding tube is oriented towards the positioning axis when swinging. Therefore, the cold air nozzle is also oriented towards the positioning axis, thereby tilting the cold air nozzle and covering the side of the fruits and vegetables, further improving the pre-cooling effect.

[0019] This invention also significantly improves the quality of fruits and vegetables after negative pressure pretreatment, effectively reduces problems such as uneven moisture evaporation and tissue stress damage caused by uneven precooling, while improving the efficiency of fruit and vegetable pretreatment, reducing energy consumption in subsequent processing steps, and adapting to the post-harvest pretreatment needs of various fruits and vegetables, making it highly practical. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall three-dimensional structure of the rapid negative pressure pretreatment machine for fruits and vegetables proposed in this invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the conveyor belt and reciprocating moving components in the fruit and vegetable rapid negative pressure pretreatment machine proposed in this invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the cold air component in the rapid negative pressure pretreatment machine for fruits and vegetables proposed in this invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the reciprocating moving component in the rapid negative pressure pretreatment machine for fruits and vegetables proposed in this invention.

[0024] Figure 5 This is a three-dimensional structural diagram of the reciprocating moving component in the fruit and vegetable rapid negative pressure pretreatment machine proposed in this invention, showing its disassembled state.

[0025] Figure 6 This is a partial three-dimensional structural diagram of the actuating rod and side wave plate in the fruit and vegetable rapid negative pressure pretreatment machine proposed in this invention.

[0026] Figure 7 This is a schematic diagram of the overall three-dimensional structure of the other side of the rapid negative pressure pretreatment machine for fruits and vegetables proposed in this invention. The attached diagram shows: 1. Fixed frame; 2. Negative pressure box; 3. Conveyor belt; 4. Control box; 5. Cooling air assembly; 6. Drive motor; 7. Reciprocating moving assembly; 8. Cooling nozzle; 9. Refrigeration compressor; 10. Air cooler; 11. Connecting pipe; 12. Pipe fixing bracket; 13. Mounting side plate; 14. Reciprocating moving frame; 15. Sliding plate; 16. Guide bar; 17. Guide groove; 18. Linkage rod; 19. Straight groove guide port; 20. Side sliding pipe. 21. Main pipe; 22. Support frame; 23. Telescopic rod; 24. Sleeve plate; 25. Positioning shaft; 26. Crank; 27. Reciprocating drive head; 28. Reciprocating slot; 29. ​​Guide rail; 30. Guide plate; 31. Actuating rod; 32. Side roller; 33. Side corrugated plate; 34. T-joint rigid pipe; 35. Flexible hose; 36. Humidifier system; 37. Water trap; 38. Ozone sterilization system; 39. Sterilizing agent spray system; 40. Vacuum pump. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0028] Example 1 refer to Figures 1-7 In this embodiment, a fixed frame 1 and a negative pressure box 2 are included. The negative pressure box 2 is fixedly installed inside the fixed frame 1. A cold air assembly 5 is provided at the bottom of the inner wall of the fixed frame 1. The cold air assembly 5 includes a refrigeration compressor 9, a cold air blower 10 and a connecting pipe 11. The refrigeration compressor 9 and the cold air blower 10 are respectively fixedly installed at the bottom of the inner wall of the fixed frame 1 and staggered from each other. The refrigeration compressor 9 and the cold air blower 10 are fixedly connected by a pipe. The bottom end of the connecting pipe 11 is fixedly connected to the output end of the cold air blower 10.

[0029] In practice, the fixed frame 1 provides stable support for the entire equipment, ensuring stable operation of each component after installation. The negative pressure box 2 is fixed inside it. The negative pressure box 2 is equipped with a vacuum pump and suction pipe, etc. After the fruits and vegetables are transported, the top cover of the negative pressure box 2 is closed, and then the vacuum pump is used to evacuate the vacuum. This is existing technology and will not be elaborated here. It can ensure the airtightness of the subsequent negative pressure pretreatment. The refrigeration compressor 9 is used to prepare low-temperature cold air, and the cold air fan 10 is responsible for transporting the cold air to the connecting pipe 11. The two are installed separately to avoid mutual interference during operation, improve the efficiency of cold air preparation and transportation, provide a stable low-temperature air source for the precooling of fruits and vegetables, and lay the foundation for the subsequent tilting of the cold air nozzle 8 to spray cold air and expand the precooling range.

[0030] The connecting pipe 11 includes a three-way rigid pipe 34 and a flexible hose 35. The bottom end of the three-way rigid pipe 34 is fixedly connected to the output end of the air cooler 10, and the top end of the three-way rigid pipe 34 is fixedly connected to one end of the flexible hose 35.

[0031] In practice, the three-way rigid pipe 34 can divert the cold air output by the air cooler 10 to two sets of flexible hoses 35 to meet the cooling needs of the two sets of reciprocating moving components 7. The flexible hoses 35 have good flexibility and can adapt to the reciprocating swing and horizontal movement of the reciprocating moving components 7, avoiding pipe entanglement and damage, ensuring the continuity and stability of cold air delivery, and providing a guarantee for the continuous spraying of cold air nozzles 8 to achieve secondary pre-cooling.

[0032] A conveyor belt 3 is fixedly installed on the inner wall of the fixed frame 1 near the top, which transports fruits and vegetables into the negative pressure box 2. A reciprocating moving assembly 7 is fixedly installed on the conveyor belt 3. One end of the cold air assembly 5 is fixedly connected to the reciprocating moving assembly 7 and delivers cold air to the reciprocating moving assembly 7. A drive motor 6 for providing power to the reciprocating moving assembly 7 is fixedly installed on the top of the fixed frame 1 through a motor bracket. The reciprocating moving assembly 7 includes a mounting side plate 13, a reciprocating moving frame 14, a sliding plate 15, a linkage rod 18, a side sliding tube 20, a main pipe 21, a support frame 22, a positioning shaft 25, a crank 26, a reciprocating drive head 27, a reciprocating slot 28, and a telescopic assembly. The mounting side plate 13 is fixedly installed on the top of the conveyor belt 3 by bolts. The support frame 22 is fixedly installed on the top of the mounting side plate 13. The positioning shaft 25 is fixedly installed on the top of the support frame 22. The telescopic assembly is rotatably installed on both ends of the positioning shaft 25. One end of rod 18 is rotatably connected to the side of telescopic assembly. Reciprocating frame 14 is slidably connected to the top of mounting side plate 13. Both ends of reciprocating frame 14 extend to both sides of conveyor belt 3. Sliding plate 15 is fixedly installed at one end of reciprocating frame 14. The other end of linkage rod 18 away from telescopic assembly is rotatably connected to the end face of sliding plate 15. One end of flexible hose 35 is fixedly connected to and communicates with the end face of side sliding tube 20. Side sliding tube 20 is fixedly installed on the end face of telescopic assembly. One end of side sliding tube 20 is fixedly connected to the end face of main pipe 21. Cooling nozzle 8 is fixedly installed on the surface of main pipe 21 facing the conveyor belt 3. Crank 26 is fixedly installed on the output shaft end of drive motor 6. Reciprocating drive head 27 is fixedly installed on the lower surface of crank 26 away from the output shaft of drive motor 6. Reciprocating slot 28 is opened on the surface of reciprocating frame 14. Reciprocating drive head 27 is movably inserted into the inside of reciprocating slot 28.

[0033] In practice, the conveyor belt 3 adopts a conveyor mesh belt design, which facilitates the penetration of cold air through the mesh belt to act on the bottom of the fruits and vegetables, achieving synchronous pre-cooling from top to bottom; the mounting side plate 13 is fixed by bolts, which facilitates disassembly and maintenance; the support frame 22 cooperates with the positioning shaft 25 to provide a stable rotation fulcrum for the telescopic component; the drive motor 6 drives the crank 26 to rotate, and the reciprocating drive head 27 moves in the reciprocating slot 28, converting the circular motion into the linear reciprocating motion of the reciprocating moving frame 14, which in turn drives the telescopic component to swing through the linkage rod 18; when the side sliding tube 20 moves, it will drive the telescopic rod 23 to move inside the sleeve plate 24; the cold air conveyed by the flexible hose 35 is sprayed out from the cold air nozzle 8 through the side sliding tube 20 and the main pipe 21, and the swing speed is greater than the fruit and vegetable conveying speed, expanding the pre-cooling range and covering the sides of the fruits and vegetables, completing the initial pre-cooling of the fruits and vegetables.

[0034] A reciprocating cold air nozzle 8 for pre-cooling fruits and vegetables is fixedly installed on the reciprocating moving component 7 at a position facing the conveyor belt 3. A control box 4 for controlling the cold air component 5, the conveyor belt 3, and the negative pressure box 2 is fixedly installed at the bottom of the inner wall of the fixed frame 1 near the cold air component 5.

[0035] In practice, the cold air nozzle 8 is directed toward the fruits and vegetables on the conveyor belt 3 and tilts as it swings, ensuring that the cold air is precisely applied to the surface of the fruits and vegetables and can also cover the sides of the fruits and vegetables. It moves with the reciprocating component 7 and its swing speed is greater than the conveying speed of the fruits and vegetables, which can further expand the pre-cooling range. The control box 4 can centrally control the cooling intensity of the cold air component 5, the conveying speed of the conveyor belt 3, the speed of the drive motor 6, and the negative pressure intensity of the negative pressure box 2, so as to realize the automated operation of the equipment, flexibly adapt to the pre-treatment needs of different fruits and vegetables, improve the convenience of operation, and provide parameter control support for the orderly implementation of secondary pre-cooling.

[0036] Example 2 refer to Figures 1-7 In this embodiment, the reciprocating motion component 7 also includes a guide bar 16 and a guide groove 17. The guide bar 16 is fixedly installed on the side of the conveyor belt 3, and the guide groove 17 is opened on the inner side of the sliding plate 15. The guide bar 16 is movably installed inside the guide groove 17.

[0037] The reciprocating motion assembly 7 also includes a straight groove guide port 19, which is opened on the surface of the mounting side plate 13. The side sliding tube 20 is slidably connected inside the straight groove guide port 19. The telescopic assembly includes a telescopic rod 23 and a sleeve plate 24. The telescopic rod 23 is rotatably sleeved on the surface of the positioning shaft 25, and the sleeve plate 24 is rotatably sleeved on the surface of the side sliding tube 20. One end of the telescopic rod 23 is movably inserted into the inside of the sleeve plate 24, and the end of the linkage rod 18 away from the sliding plate 15 is rotatably connected to the side of the sleeve plate 24.

[0038] In specific implementation, the guide bar 16 cooperates with the guide groove 17 to guide and limit the reciprocating motion of the sliding plate 15 and the reciprocating moving frame 14, preventing them from deviating during movement and ensuring the smooth operation of the reciprocating moving component 7; the straight groove guide port 19 limits the sliding direction of the side sliding tube 20, ensuring that the side sliding tube 20 moves back and forth in the horizontal direction, thereby ensuring the stability of the moving trajectory of the cold air nozzle 8; the telescopic rod 23 can flexibly extend and retract within the sleeve plate 24 to adapt to the swing amplitude of the telescopic component, and cooperates with the linkage rod 18 and the sleeve plate 24 to convert the linear motion of the reciprocating moving frame 14 into the reciprocating sliding of the side sliding tube 20, and also ensure that the distance between the cold air nozzle 8 and the fruits and vegetables is consistent when the side sliding tube 20 moves, avoiding uneven precooling and further improving the precooling effect.

[0039] The linkage rod 18, straight groove guide port 19, side sliding pipe 20, main pipe 21, support frame 22, telescopic rod 23, sleeve plate 24, positioning shaft 25, and cold air nozzle 8 are all in two sets. The linkage rods 18, straight groove guide port 19, side sliding pipe 20, main pipe 21, support frame 22, telescopic rod 23, sleeve plate 24, positioning shaft 25, and cold air nozzle 8 in both sets are arranged symmetrically with the reciprocating moving frame 14 as the axis of symmetry. Each set contains two linkage rods 18, straight groove guide port 19, side sliding pipe 20, main pipe 21, support frame 22, telescopic rod 23, sleeve plate 24, positioning shaft 25, and cold air nozzle 8. Each set contains two linkage rods 18, straight groove guide port 19, side sliding pipe 20, main pipe 21, support frame 22, telescopic rod 23, sleeve plate 24, positioning shaft 25, and cold air nozzle 8. The sliding pipe 20, main pipe 21, support frame 22, telescopic rod 23, sleeve plate 24, positioning shaft 25 and cold air nozzle 8 are arranged symmetrically with the sliding plate 15 as the axis of symmetry. There are two sets of sliding plates 15. The two sets of sliding plates 15 are fixedly installed at both ends of the reciprocating moving frame 14. The reciprocating moving frame 14 is designed in an "n" shape. Two sets of straight groove guide ports 19 are respectively opened on the surface of the conveyor belt 3 and the mounting side plate 13. One set of positioning shafts 25 is fixedly installed on the support frame 22, and the other set of positioning shafts 25 is fixedly installed on the side of the conveyor belt 3. The telescopic component swings back and forth around the positioning shaft 25 to drive the sliding pipe 20 to move back and forth along the straight groove guide port 19.

[0040] In practice, multiple components are symmetrically arranged and divided into two independent pre-cooling units, providing a structural basis for secondary pre-cooling of fruits and vegetables. This enables full coverage of fruits and vegetables on the conveyor belt 3, avoiding pre-cooling blind spots. The reciprocating moving frame 14 is designed in an "n" shape and can be straddled above the conveyor belt 3, ensuring that the sliding plates 15 at both ends move synchronously. Two sets of positioning shafts 25 are fixed to the support frame 22 and the side of the conveyor belt 3, respectively, providing double support for the telescopic components and improving the stability of the telescopic components' swing. This ensures that the reciprocating swing of the cold air nozzle 8 is more stable, and the swing speed is greater than the fruit and vegetable conveying speed, further expanding the pre-cooling range and improving the uniformity of pre-cooling.

[0041] The conveyor belt 3 is a conveyor mesh belt. Fruits and vegetables are laid flat on the surface of the conveyor mesh belt. In each group of side sliding pipes 20, main pipes 21 and cold air nozzles 8, one side sliding pipe 20, main pipe 21 and cold air nozzle 8 is located inside the conveyor belt 3 and at the bottom of the upper half of the conveyor mesh belt and the fruits and vegetables. The other side sliding pipe 20, main pipe 21 and cold air nozzle 8 is located at the top of the upper half of the conveyor mesh belt and the fruits and vegetables. The cold air nozzles 8 in each group deliver cold air towards the fruits and vegetables.

[0042] In practice, the hollow design of the conveyor belt allows the cold air sprayed from the bottom cold air nozzles 8 to penetrate the belt and act on the lower surface of the fruits and vegetables. The top and bottom cold air nozzles 8 are tilted when they move back and forth, and the oscillation speed is greater than the conveying speed of the fruits and vegetables. This not only achieves synchronous pre-cooling of the upper and lower surfaces of the fruits and vegetables, but also covers the sides of the fruits and vegetables, solving the problem that traditional pre-cooling can only cover a single surface of the fruits and vegetables. At the same time, the fruits and vegetables are laid flat on the belt, which can reduce the problem of insufficient pre-cooling caused by the stacking of fruits and vegetables. In addition, the two sets of symmetrically arranged pre-cooling units can realize secondary pre-cooling of fruits and vegetables. That is, after the fruits and vegetables are pre-cooled by one set of nozzles and turned by the toggle lever 31, they are pre-cooled again by another set of nozzles, which greatly improves the uniformity and effect of pre-cooling.

[0043] Example 3 refer to Figures 1-7 In this embodiment, a guide rail 29 is fixedly installed on the lower surface of the reciprocating moving frame 14 at a position offset from the reciprocating slot 28. A guide plate 30 is slidably connected to the surface of the guide rail 29. A side wave plate 33 is fixedly installed on the inner wall of the conveyor belt 3 at a position corresponding to the guide plate 30. The end face of the guide plate 30 is movably connected to the inner side of the side wave plate 33. A toggle rod 31 for moving fruits and vegetables is fixedly installed at the bottom end of the guide plate 30. A side roller 32 is rotatably installed on the end face of the guide plate 30. The side roller 32 is rotatably connected to the surface of the side wave plate 33. There are two sets of side wave plates 33. The two sets of side wave plates 33 are symmetrically installed on both sides of the inner wall of the conveyor belt 3. There are also two sets of side rollers 32. When the side roller 32 on one side is located at the trough of one set of side wave plates 33, the side roller 32 on the other side is located at the crest of the other set of side wave plates 33.

[0044] In practice, the guide rail 29 provides horizontal sliding support for the guide plate 30. The side roller 32 can convert the sliding friction between the guide plate 30 and the side wave plate 33 into rolling friction, reducing component wear and extending service life. The wave-shaped structure of the side wave plate 33 allows the guide plate 30 to slide horizontally back and forth along the guide rail 29 when it moves with the reciprocating frame 14, thereby driving the actuating rod 31 to turn the fruits and vegetables, realizing the adjustment of the fruit and vegetable posture. After the fruits and vegetables are pre-cooled by the first set of cold air nozzles 8, they are turned by the actuating rod 31 and then transported to the second set of cold air nozzles 8 for further pre-cooling, so that the fruit and vegetable contact parts and sides can fully contact the cold air, completely eliminating the pre-cooling blind zone. At the same time, the cooperation between the two sets of side wave plates 33 and the side roller 32 can make the horizontal reciprocating sliding of the actuating rod 31 more stable, avoiding damage to the fruit and vegetable skin and ensuring the quality of the fruits and vegetables.

[0045] Example 4 refer to Figures 1-7In this embodiment, a sterilizing agent spraying system 39 is fixedly installed on the negative pressure chamber 2 at the entrance. Another ozone sterilization system 38 for sterilizing fruits and vegetables is provided on the top of the inner wall of the fixing frame 1. A water trap 37 is fixedly installed on the top of the inner wall of the fixing frame 1 corresponding to the negative pressure chamber 2 to receive and condense water vapor inside the negative pressure chamber 2. A humidifier system 36 is fixedly installed on the fixing frame 1 near the water trap 37. A vacuum pump 40 for evacuating the negative pressure chamber 2 is fixedly installed on the top of the negative pressure chamber 2.

[0046] In specific implementation, the sterilizing agent spray system 39 first performs pre-sterilization when fruits and vegetables enter the negative pressure chamber 2. The water trap 37, sterilizing agent spray system 39, ozone sterilization system 38, and humidifier system 36 are all existing technologies and can be operated by personnel with common sense within this technical field. The vacuum cooling process uses a vacuum pump to remove air from the negative pressure chamber 2, making the inside of the negative pressure chamber 2 a vacuum state. This allows a small portion of the moisture in the room-temperature fruits and vegetables inside the negative pressure chamber 2 to evaporate into water vapor in a vacuum environment, thereby carrying away the heat from the fruits and vegetables and achieving a cooling effect. The evaporated water vapor enters the water trap through the suction pipe. When the water vapor passes through the water trap, it is cooled at a low temperature. When the refrigerant coil system is in operation, almost all water vapor will condense into water droplets and adhere to the refrigerant coil of the low-temperature refrigerant coil system. As the number of water droplets increases, they drip into the water storage tank of the water trap due to gravity. The water condensed in the water trap is discharged after the processing time has elapsed or the processing temperature has been reached. During the fruit and vegetable cooling pretreatment and vacuum cooling treatment, the humidification system maintains the relative humidity inside the negative pressure chamber 2, effectively reducing the water loss rate of fruits and vegetables. After the last use of the equipment each day, the ozone sterilization system is manually started, which can effectively kill bacteria in the equipment and ensure the cleanliness and hygiene of the equipment. The overall structure of the fruit and vegetable cooling pretreatment machine is simple and compact, with few moving parts, easy to implement, and conducive to widespread application.

[0047] The working principle of this invention is: In use, the equipment is started via control box 4. Refrigeration compressor 9 prepares low-temperature cold air, which is then delivered to the three-way rigid pipe 34 via cooler fan 10. The air is then distributed to two sets of side-sliding pipes 20 via flexible hose 35, and finally ejected from cold air nozzle 8, providing stable cold air for pre-cooling. Drive motor 6 rotates crank 26, and reciprocating drive head 27 moves within reciprocating slot 28, driving reciprocating moving frame 14 to slide reciprocally along mounting side plate 13. Guide bar 16 and guide slot 17 ensure smooth movement. Reciprocating moving frame 14, via linkage rod 18, drives sleeve plate 24 and telescopic rod 23 to rotate around positioning shaft 25. The oscillation causes the side-sliding tube 20 to slide back and forth along the straight groove guide opening 19. As the side-sliding tube 20 moves, it drives the telescopic rod 23 to move inside the sleeve plate 24. This ensures that the distance between the cold air nozzle 8 and the fruits and vegetables remains consistent during the oscillation, preventing uneven pre-cooling caused by changes in the distance between the cold air nozzle 8 and the fruits and vegetables. This further improves the pre-cooling effect. The side-sliding tube 20 drives the main tube 21 to move back and forth synchronously with the cold air nozzle 8 for oscillating pre-cooling. The oscillation speed here is greater than the conveying speed of the fruits and vegetables. During the oscillation, the cold air nozzle 8 tilts and increases the pre-cooling effect. The cooling range is expanded to achieve comprehensive pre-cooling of the upper and lower surfaces of fruits and vegetables, and the inclined cold air nozzles 8 also pre-cool the sides of the fruits and vegetables. The side sliding tube 20 moves horizontally along the straight groove guide opening 19, which can effectively cover all surfaces of fruits and vegetables, avoid pre-cooling blind spots, and thus improve the uniformity of pre-cooling. At the same time, after the fruits and vegetables are pre-cooled by a set of cold air nozzles 8, they pass through the actuating rod 31. The reciprocating moving frame 14 drives the guide rail 29 and the guide plate 30 to move synchronously. The side roller 32 rolls on the side wave plate 33, causing the guide plate 30 to slide back and forth horizontally along the guide rail 29, which drives the actuating rod 31 to turn the fruit. The turned fruits and vegetables then pass through another set of cold air nozzles 8 for further pre-cooling, ensuring that the parts of the fruits and vegetables in contact with the cold air are fully exposed to the cold air, thus improving the pre-cooling effect and solving the problem of insufficient pre-cooling in traditional methods. After pre-cooling, the fruits and vegetables are sent to the negative pressure chamber 2 via conveyor belt 3 for negative pressure treatment. The entire process is seamless and requires no manual intervention, achieving automated assembly line operation. Another effect not mentioned is that the operating parameters of each component can be flexibly adjusted through the control box 4 to adapt to the pre-treatment needs of different fruits and vegetables, greatly improving processing efficiency and product quality, and reducing production energy consumption.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid negative pressure pretreatment machine for fruits and vegetables, characterized in that, Includes a fixed frame (1) and a negative pressure box (2). The negative pressure box (2) is fixedly installed inside the fixed frame (1). A cold air assembly (5) is provided at the bottom of the inner wall of the fixed frame (1). A conveyor belt (3) for transporting fruits and vegetables into the negative pressure box (2) is fixedly installed near the top of the inner wall of the fixed frame (1). A reciprocating motion assembly (7) is fixedly installed on the conveyor belt (3). One end of the cold air assembly (5) is fixedly connected to the reciprocating motion assembly (7) and delivers cold air to the reciprocating motion assembly (7). The top of the fixed frame (1) is fixedly mounted with a drive motor (6) for providing power to the reciprocating motion component (7) via a motor bracket. A reciprocating cold air nozzle (8) for pre-cooling fruits and vegetables is fixedly installed on the reciprocating moving component (7) facing the conveyor belt (3). A control box (4) for controlling the cold air component (5), the conveyor belt (3) and the negative pressure box (2) is fixedly installed on the bottom of the inner wall of the fixed frame (1) near the cold air component (5).

2. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 1, characterized in that, The cooling air assembly (5) includes a refrigeration compressor (9), a cooler (10) and a connecting pipe (11). The refrigeration compressor (9) and the cooler (10) are respectively fixedly installed at the bottom of the inner wall of the fixed frame (1) and staggered from each other. The refrigeration compressor (9) and the cooler (10) are fixedly connected by a pipe. The bottom end of the connecting pipe (11) is fixedly connected to the output end of the cooler (10).

3. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 2, characterized in that, The connecting pipe (11) includes a three-way rigid pipe (34) and a flexible hose (35). The bottom end of the three-way rigid pipe (34) is fixedly connected to the output end of the air cooler (10), and the top end of the three-way rigid pipe (34) is fixedly connected to one end of the flexible hose (35).

4. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 3, characterized in that, The reciprocating motion assembly (7) includes a mounting side plate (13), a reciprocating moving frame (14), a sliding plate (15), a linkage rod (18), a side sliding tube (20), a main pipe (21), a support frame (22), a positioning shaft (25), a crank (26), a reciprocating drive head (27), a reciprocating slot (28), and a telescopic assembly. The mounting side plate (13) is fixedly mounted on the top of the conveyor belt (3) by bolts. The support frame (22) is fixedly mounted on the top of the mounting side plate (13). The positioning shaft (25) is fixedly mounted on the top of the support frame (22). The telescopic assembly is rotatably mounted on both ends of the positioning shaft (25). One end of the linkage rod (18) is rotatably connected to the side of the telescopic assembly. The reciprocating moving frame (14) is slidably connected to the top of the mounting side plate (13). Both ends of the reciprocating moving frame (14) extend to both sides of the conveyor belt (3). The sliding plate (15) is fixedly installed at one end of the reciprocating frame (14), and the other end of the linkage rod (18) away from the telescopic assembly is rotatably connected to the end face of the sliding plate (15). One end of the flexible hose (35) is fixedly connected to and communicates with the end face of the side sliding tube (20). The side sliding tube (20) is fixedly installed on the end face of the telescopic assembly. One end of the side sliding tube (20) is fixedly connected to the end face of the main pipe (21). The cold air nozzle (8) is fixedly installed on the side of the main pipe (21) facing the conveyor belt (3). The crank (26) is fixedly installed at the output shaft end of the drive motor (6). The reciprocating drive head (27) is fixedly installed on the lower surface of the crank (26) away from the output shaft of the drive motor (6). The reciprocating slot (28) is opened on the surface of the reciprocating frame (14). The reciprocating drive head (27) is movably inserted into the inside of the reciprocating slot (28).

5. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 4, characterized in that, The reciprocating motion component (7) also includes a guide bar (16) and a guide groove (17). The guide bar (16) is fixedly installed on the side of the conveyor belt (3), and the guide groove (17) is opened on the inner side of the sliding plate (15). The guide bar (16) is movably installed inside the guide groove (17).

6. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 5, characterized in that, The reciprocating motion assembly (7) also includes a straight groove guide port (19), which is opened on the surface of the mounting side plate (13). The side sliding tube (20) is slidably connected inside the straight groove guide port (19). The telescopic assembly includes a telescopic rod (23) and a sleeve plate (24). The telescopic rod (23) is rotatably sleeved on the surface of the positioning shaft (25), and the sleeve plate (24) is rotatably sleeved on the surface of the side sliding tube (20). One end of the telescopic rod (23) is movably inserted into the inside of the sleeve plate (24), and the end of the linkage rod (18) away from the sliding plate (15) is rotatably connected to the side of the sleeve plate (24).

7. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 6, characterized in that, The linkage rod (18), straight groove guide port (19), side sliding pipe (20), main pipe (21), support frame (22), telescopic rod (23), sleeve plate (24), positioning shaft (25), and cold air nozzle (8) are all in two sets. The linkage rod (18), straight groove guide port (19), side sliding pipe (20), main pipe (21), support frame (22), telescopic rod (23), sleeve plate (24), positioning shaft (25), and cold air nozzle (8) in both sets are arranged symmetrically with the reciprocating moving frame (14) as the axis of symmetry. Each set contains two linkage rods (18), straight groove guide port (19), side sliding pipe (20), main pipe (21), support frame (22), telescopic rod (23), sleeve plate (24), positioning shaft (25), and cold air nozzle (8). The two linkage rods (18) in each set are... The straight groove guide port (19), side sliding pipe (20), main pipe (21), support frame (22), telescopic rod (23), sleeve plate (24), positioning shaft (25) and cold air nozzle (8) are arranged symmetrically with the sliding plate (15) as the axis of symmetry. There are two sets of sliding plates (15). The two sets of sliding plates (15) are fixedly installed at both ends of the reciprocating moving frame (14). The reciprocating moving frame (14) is designed in an "n" shape. The two sets of straight groove guide ports (19) are respectively opened on the surface of the conveyor belt (3) and the mounting side plate (13). One set of positioning shafts (25) is fixedly installed on the support frame (22), and the other set of positioning shafts (25) is fixedly installed on the side of the conveyor belt (3). The telescopic component swings back and forth around the positioning shaft (25) to drive the side sliding pipe (20) to move back and forth along the straight groove guide port (19).

8. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 7, characterized in that, The conveyor belt (3) is a conveyor mesh belt. Fruits and vegetables are laid flat on the surface of the conveyor mesh belt. In each group of side sliding pipes (20), main pipes (21) and cold air nozzles (8), one side sliding pipe (20), main pipe (21) and cold air nozzle (8) is located inside the conveyor belt (3) and at the bottom of the upper half of the conveyor mesh belt and the fruits and vegetables. The other side sliding pipe (20), main pipe (21) and cold air nozzle (8) is located at the top of the upper half of the conveyor mesh belt and the fruits and vegetables. The cold air nozzle (8) in each group delivers cold air towards the fruits and vegetables.

9. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 8, characterized in that, A guide rail (29) is fixedly installed on the lower surface of the reciprocating moving frame (14) at a position offset from the reciprocating slot (28). A guide plate (30) is slidably connected to the surface of the guide rail (29). A side wave plate (33) is fixedly installed on the inner wall of the conveyor belt (3) at a position corresponding to the guide plate (30). The end face of the guide plate (30) is movably connected to the inner side of the side wave plate (33). A toggle rod (31) for moving fruits and vegetables is fixedly installed at the bottom end of the guide plate (30).

10. The rapid negative pressure pretreatment machine for fruits and vegetables according to claim 9, characterized in that, The guide plate (30) is rotatably mounted with side rollers (32), which are rolled on the surface of the side corrugated plates (33). There are two sets of side corrugated plates (33), which are symmetrically installed on both sides of the inner wall of the conveyor belt (3). There are also two sets of side rollers (32). When one side roller (32) is located at the trough of one set of side corrugated plates (33), the other side roller (32) is located at the crest of the other set of side corrugated plates (33). The negative pressure box (2) is located on A sterilizing agent spraying system (39) is fixedly installed at the entrance. Another ozone sterilization system (38) for sterilizing fruits and vegetables is installed on the top of the inner wall of the fixed frame (1). A water trap (37) for receiving water vapor inside the negative pressure box (2) and condensing it is fixedly installed on the top of the inner wall of the fixed frame (1) corresponding to the negative pressure box (2). A humidifier system (36) is fixedly installed on the fixed frame (1) near the water trap (37). A vacuum pump (40) for evacuating the negative pressure box (2) is fixedly installed on the top of the negative pressure box (2).

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