Low-temperature drying processing equipment and method for lotus seed chips

Abstract

The application discloses a kind of low-temperature drying processing equipment of lotus seed crisp piece and method thereof, it is related to food processing technical field, including shell, vacuum generating equipment and box, the shell includes horizontally extended processing part, the both ends of processing part are respectively connected with inclined transition part, the end of transition part away from processing part is connected with horizontal conveying part;In the application, the shell structure of horizontal conveying part, inclined transition part and horizontal processing part is used, cooperate with the partition plate of equidistant arrangement on metal mesh belt and the sealing plate and air bag of being located in the opening of metal mesh belt inside near conveying part, so that lotus seed piece enters shell when conveying part, the end of partition plate only generates short-stroke sliding contact seal with air bag and conveying part inner wall, to greatly reduce the continuous wear of sealing assembly, effectively maintain the high-vacuum environment in shell, to ensure the product quality, appearance and crisp taste of lotus seed crisp piece.

Description

Technical Field

[0001] This invention relates to the field of food processing technology, specifically to a low-temperature drying processing equipment and method for lotus seed crisps. Background Technology

[0002] Lotus seed crisps are a ready-to-eat snack made from fresh lotus seeds through processes such as peeling, core removal, blanching, soaking, freezing, and vacuum low-temperature frying for dehydration. They are crispy, fragrant, and retain their nutrients. The vacuum low-temperature frying machine is a device that uses vegetable oil at 80-120℃ as the heat medium to dehydrate and puff materials under negative pressure. It utilizes the principle that the boiling point of water decreases under vacuum conditions, causing the water in the lotus seeds to rapidly vaporize and escape at low temperatures, forming a crispy structure. This process significantly reduces the oil content of the product and minimizes nutrient loss.

[0003] In some existing continuous vacuum low-temperature fryers, a sliding sealing device is typically used to dynamically seal the moving parts and the stationary cavity to achieve continuous material entry and exit from the vacuum chamber. However, during operation, this type of sliding sealing device generates continuous, long-distance sliding friction between the sealing element and the mating surface. As the operating time increases, the sealing element inevitably wears down, leading to a gradual increase in the sealing gap and a continuous decline in vacuum sealing performance. For the production of lotus seed chips, the stability of the vacuum level directly determines the effect of the low-temperature frying process: when the vacuum level is insufficient, the boiling point of water increases, and the material needs to be dehydrated at a higher oil temperature. This not only leads to a darker surface color and increased loss of nutrients in the lotus seed chips, but also makes it easier for oil to penetrate into the material, resulting in a higher oil content and a greasy taste in the finished product. At the same time, fluctuations in the vacuum level will cause uneven dehydration rates, resulting in significant differences in crispness and color within the same batch of lotus seed chips, affecting product consistency and commercial appearance.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this invention is to provide a low-temperature drying processing device and method for lotus seed chips, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides a low-temperature drying processing device for lotus seed chips, including a shell, a vacuum generating device and a box. The shell includes a horizontally extending processing section, and two ends of the processing section are respectively connected to an upwardly inclined transition section. The end of the transition section away from the processing section is connected to a horizontal conveying section. The vacuum generating device is connected to the interior of the processing section. A metal mesh belt is installed inside the housing. Multiple partition plates are vertically arranged at equal intervals along the working direction of the metal mesh belt. The partition plates extend into the interior of the metal mesh belt. Sealing components are provided on the side walls of the partition plates away from the metal mesh belt. The partition plates include screen plate one and screen plate two that are slidably connected to each other. A horizontal sealing plate is provided on the side of the metal mesh belt near the opening of the conveying section. The sealing plate is fixed to the inner wall of the housing. An air bladder is fixed to one end of the vertical side wall of the sealing plate near the transition section. The end of the partition plate slides in contact with the air bladder.

[0007] Furthermore, both the first and second sieve plates are provided with uniformly distributed sieve holes. When one end of the first and second sieve plates is aligned along the width direction of the metal mesh belt, the sieve holes of the two plates are aligned with each other. When the other end of the first and second sieve plates is aligned along the width direction of the metal mesh belt, the sieve holes of the two plates are staggered. Both ends of the second sieve plate along its length direction are fixed with wedge blocks. The inclined surface of the first wedge block is set away from the second sieve plate. The side of the first wedge block away from the first sieve plate slides against the second wedge block. The second wedge block is fixed on the inner wall of the transition part. The second wedge block does not contact the metal mesh belt. The conveying part is provided with a guide groove at the position corresponding to the first wedge block. The first wedge block slides and seals with the guide groove.

[0008] Furthermore, a drive mechanism is provided inside the housing. The drive mechanism includes a motor fixed inside the housing. The output end of the motor is connected to a turntable. A rotating connecting rod is rotatably connected to the outer edge of the side wall away from the housing. A horizontal rack sleeve is rotatably connected to the end of the rotating connecting rod away from the turntable. The rack sleeve slides horizontally on the inner wall of the housing. A transmission gear is engaged at the bottom end of the rack sleeve away from the rotating connecting rod. The same limiting sleeve is fitted on the outer side of the rack sleeve and the transmission gear. The rack sleeve is slidably connected to the limiting sleeve. The transmission gear is rotatably connected to the limiting sleeve. A vertical mounting groove is opened on the bottom side of the rack sleeve away from the rotating connecting rod. The rack slides in the mounting groove. A horizontally penetrating guide groove one is opened at the top of the inner wall of the limiting sleeve away from the housing. A horizontally penetrating guide groove two is opened on the inner wall of the limiting sleeve at the top of the guide groove one. A common transition groove is opened on the side of the guide groove one and the guide groove two that are close to each other. The two ends of the transition groove are tangent to the guide groove one and the guide groove two, respectively.

[0009] Furthermore, a guide block is rotatably provided at the end of the inner wall of the transition groove on the limiting sleeve plate near the first guide groove. A torsion spring is provided at the rotatable connection between the guide block and the transition groove. In the initial state, the end of the guide block away from the transition groove extends into the first guide groove. Multiple sliding columns are fixed on the side wall of the rack rod near the housing, which are evenly distributed along its length. A vertical sliding channel is horizontally opened on the side wall of the rack rod corresponding to the position of the sliding column. The sliding column slides through the sliding channel to the outside of the rack rod. The sliding column can slide in the first guide groove, the second guide groove, and the transition groove.

[0010] Furthermore, both ends of the rack sleeve are fixed with fixing blocks, which do not contact the limiting sleeve plate. A piston-type air pump is fixed to the end of the fixing block away from the limiting sleeve plate. The piston-type air pump is fixed to the inner wall of the box, and the fixing block slides on the inner wall of the box. An air supply pipe is fixed to the outer wall of the box corresponding to the output end of the piston-type air pump. The end of the piston-type air pump away from the fixing block is connected to the air supply pipe. The end of the air supply pipe away from the box is connected to the side wall of the conveying part and connected to the sealing plate. A connecting pipe is embedded in the sealing plate. One end of the connecting pipe is connected to the air supply pipe, and the other end of the connecting pipe is connected to the airbag. A pressure relief hole is provided on the outer wall of the airbag. The pressure relief hole is located on the side away from the transition part, and a small one-way valve is provided in the pressure relief hole.

[0011] A processing method for lotus seed crisps using a low-temperature drying processing device includes: Step 1: Inject oil into the machining section and start the vacuum generator to evacuate the inside of the machining section; Step 2: Lotus seed slices fall onto the metal mesh belt between two adjacent partitions. The metal mesh belt carries the lotus seed slices through the inclined transition section into the horizontally extending processing section. Step 3: The drive mechanism moves to cause the metal mesh belt to reciprocate asymmetrically, shaking the lotus seed slices on it. Step 4: The drive mechanism synchronously drives the piston-type air pump to supply air to the airbag, ensuring tight sliding contact between the partition plate and the airbag, and ensuring the vacuum level of the processing section.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. By adopting a shell structure consisting of a horizontal conveying section, an inclined transition section, and a horizontal processing section, combined with equally spaced partition plates on the metal mesh belt and a sealing plate and airbag located inside the metal mesh belt near the opening of the conveying section, when the lotus seed slices enter the shell from the conveying section, the end of the partition plate only makes short-stroke sliding contact with the airbag and the inner wall of the conveying section to seal, thereby greatly reducing the continuous wear on the sealing components, effectively maintaining the high vacuum environment inside the shell, ensuring the stability and effectiveness of the low-temperature frying process, and thus ensuring the product quality, appearance, and crispy taste of the lotus seed crisps.

[0013] 2. The drive mechanism inside the box drives the rack sleeve and rack rod to reciprocate, which makes the metal mesh belt vibrate intermittently. On the one hand, it prevents the lotus seed slices from sticking to the surface of the metal mesh belt or clumping together during frying, ensuring uniform frying. On the other hand, after frying, the vibration can be used to assist in draining oil and reduce the oil content of the finished product.

[0014] 3. During the reciprocating motion, the drive mechanism synchronously drives the piston-type air pump, which continuously supplies air to the airbag through the air supply pipe. This not only ensures the real-time airtightness of the airbag, but also allows the internal airflow to carry away the heat generated by the sliding friction of the airbag, effectively reducing the working temperature of the airbag and extending its service life. This achieves multiple uses of mechanical power and comprehensive energy utilization. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of a low-temperature drying processing equipment for lotus seed chips; Figure 2 This is a cross-sectional view of the internal structure of the shell in a low-temperature drying processing device for lotus seed chips; Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 An exploded view of the structure of a separator plate in a low-temperature drying processing device for lotus seed chips; Figure 5 This is a schematic diagram of a partial structure of a partition plate in a low-temperature drying processing device for lotus seed chips, viewed from a top-down perspective. Figure 6 This is a schematic diagram showing the connection between the drive mechanism and the metal mesh belt in a low-temperature drying processing equipment for lotus seed chips. Figure 7 This is a schematic diagram of the structure of a limiting sleeve and a rack and pinion in a low-temperature drying processing device for lotus seed chips. Figure 1 ; Figure 8 This is a schematic diagram of the structure of a limiting sleeve and a rack and pinion in a low-temperature drying processing device for lotus seed chips. Figure 2 .

[0016] In the picture: 10. Shell; 101. Conveying section; 102. Transition section; 103. Machining section; 11. Vacuum generating equipment; 12. Housing; 121. Air supply pipe; 13. Metal mesh belt; 131. Sealing plate; 132. Airbag; 14. Separator; 141. Sieve Plate 1; 142. Sieve Plate 2; 143. Wedge Block 1; 144. Wedge Block 2; 20. Motor; 21. Turntable; 22. Rotating connecting rod; 23. Rack sleeve; 231. Rack rod; 232. Sliding channel; 233. Sliding column; 24. Transmission gear; 25. Limiting sleeve; 251. Guide groove one; 252. Guide groove two; 253. Guide block; 26. Fixing block; 27. Piston air pump. Detailed Implementation

[0017] 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.

[0018] Please see the appendix Figure 1 To be continued Figure 3 The present invention provides a low-temperature drying processing device for lotus seed chips: including a shell 10, a vacuum generating device 11 and a box 12. The shell 10 includes a horizontally extending processing section 103. Both ends of the processing section 103 are respectively connected to an upwardly inclined transition section 102. The end of the transition section 102 away from the processing section 103 is connected to a horizontal conveying section 101. The vacuum generating device 11 is in communication with the interior of the processing section 103. A metal mesh belt 13 is provided inside the housing 10. Multiple partition plates 14 are vertically arranged at equal intervals along the working direction of the metal mesh belt 13. The partition plates 14 extend into the interior of the metal mesh belt 13. Sealing components are provided on the side walls of the partition plates 14 away from the metal mesh belt 13. The partition plates 14 include a first screen plate 141 and a second screen plate 142 that are slidably connected to each other. A horizontal sealing plate 131 is provided on the side of the metal mesh belt 13 near the opening of the conveying part 101. The sealing plate 131 is fixed to the inner wall of the housing 10. An air bag 132 is fixed on the vertical side wall of the sealing plate 131 near the transition part 102. The end of the partition plate 14 is in sliding contact with the air bag 132.

[0019] It should be noted that the cross-sectional area of ​​the conveying section 101 along the working direction perpendicular to the metal mesh belt 13 is smaller than the cross-sectional area of ​​the transition section 102. That is, when the metal mesh belt 13 drives the partition plate 14 to move in the conveying section 101, the partition plates 14 located on both sides of the metal mesh belt 13 can slide in close contact with the inner wall of the conveying section 101 respectively. When the metal mesh belt 13 drives the partition plate 14 to move into the transition section 102, the side wall of the partition plate 14 will no longer rub against the inner wall of the transition section 102. Furthermore, when the metal mesh belt 13 moves the partition plate 14 to the processing section 103, there is a gap between the partition plate 14 and the inner wall of the processing section 103. It is understood that this gap will not cause the lotus seed slices to fall to the outside from this point. The gap between the partition plate 14 and the inner wall of the processing section 103 is smaller than the gap between the partition plate 14 and the inner wall of the transition section 102. Sealing components, such as sealing strips, are provided on the side walls of the partition plate 14 away from the metal mesh belt 13, and sealing strips are provided on the side walls of the first sieve plate 141 and the second sieve plate 142 away from the metal mesh belt 13. One end of the partition plate 14 extending into the metal mesh belt 13 slides in contact with the airbag 132 fixed on the sealing plate 131. Since the contact only occurs in the connection area between the conveying section 101 and the transition section 102, the friction stroke is short, resulting in less wear on the airbag 132 and less wear on the seals on the side wall of the partition plate 14, such as the sealing strip. This ensures that the vacuum level in the transition section 102 and the processing section 103 always meets the processing requirements and the fluctuation is controlled within a reasonable range. This ensures that the low-temperature frying time and oil temperature of the same batch of lotus seed slices are uniform, thus ensuring that the appearance of the fried lotus seed slices is qualified while avoiding the lotus seed slices absorbing too much oil. The combination of the conveying section 101, the transition section 102, and the processing section 103 allows this design to be integrated with the production line for continuous production and automatic loading and unloading. The continuous sealing at the end of the conveying section 101 reduces the working pressure of the vacuum generating device 11 and maintains the vacuum stability of the chamber in the processing section 103. The height difference between the conveying section 101 and the processing section 103 naturally forms a cavity in the processing section 103 to facilitate the storage of frying oil. It is understood that a heating component and an oil circulation component are installed at the bottom of the processing section 103 for circulating and heating the oil, which will not be described in detail here.

[0020] Please see the appendix Figure 4 With appendix Figure 5 The present invention provides a technical solution: both the first sieve plate 141 and the second sieve plate 142 are provided with uniformly distributed sieve holes. When the first sieve plate 141 and the second sieve plate 142 are aligned at one end along the width direction of the metal mesh belt 13, the sieve holes of the two are aligned with each other. When the first sieve plate 141 and the second sieve plate 142 are aligned at the other end along the width direction of the metal mesh belt 13, the sieve holes of the two are staggered. Both ends of the second screen plate 142 along its length are fixed with wedge blocks 143. The inclined surface of the wedge blocks 143 faces away from the second screen plate 142. The side of the wedge blocks 143 away from the first screen plate 141 slides against the second wedge block 144. The second wedge block 144 is fixed on the inner wall of the transition part 102. The second wedge block 144 does not contact the metal mesh belt 13. The conveying part 101 is provided with a guide groove at the position corresponding to the first wedge block 143. The first wedge block 143 slides and seals with the guide groove.

[0021] It should be noted that the lengths of sieve plate 141 and sieve plate 142 are different, with sieve plate 141 being shorter than sieve plate 142. When one end of the two is flush, the end of the wedge block 143 on that side protrudes from sieve plate 142, while the end of the wedge block 143 on the other side is flush with the end of sieve plate 142. At this time, the sieve holes on sieve plate 141 and sieve plate 142 are misaligned. At this time, sieve plate 141 and sieve plate 142 are not interconnected, forming a plate that is not permeable to air or liquid. The guide groove is used to fit the protruding wedge block 143, so that no leakage will occur at the conveying part 101. When the partition plate 14 moves to the transition section 102, the wedge block 143 on the protruding side will slide into contact with the corresponding wedge block 144, thereby forcing the wedge block 143 to slide, which in turn drives the sieve plate 141 to slide, so that the sieve holes on the two are aligned. This allows the oil to pass through when entering the processing section 103. When frying in the processing section 103, the shaking metal mesh belt 13, in conjunction with the sieve holes on the partition plate 14, can enhance the flow of oil, further preventing the lotus seeds from sticking and agglomerating during frying, and further ensuring product quality. Furthermore, the inclined surface of wedge block 144 near wedge block 143 is distributed in a stepped manner, as shown in the following figure. Figure 5 As shown, the wedge block 143 can be guided to slide against it step by step, thereby gradually causing the sieve plate 141 to slide, making the switching smoother.

[0022] Please see the appendix Figure 6 To be continued Figure 8 The present invention provides a technical solution: a driving mechanism is provided inside the housing 12. The driving mechanism includes a motor 20 fixed inside the housing 12. The output end of the motor 20 is connected to a turntable 21. A rotating connecting rod 22 is rotatably connected to the outer edge of the side wall of the turntable 21 away from the housing 10. A horizontal rack sleeve 23 is rotatably connected to the end of the rotating connecting rod 22 away from the turntable 21. The rack sleeve 23 slides horizontally on the inner wall of the housing 12. A transmission gear 24 is engaged at the bottom end of the rack sleeve 23 away from the rotating connecting rod 22. The rack sleeve 23 and the transmission gear 24 are fitted with the same limiting sleeve 25. The rack sleeve 23 is slidably connected to the limiting sleeve 25, and the transmission gear 24 is rotatably connected to the limiting sleeve 25. The bottom of the rack sleeve 23 is vertically provided with an installation groove on the side away from the rotating connecting rod 22. The rack rod 231 slides in the installation groove. The top of the inner wall of the limiting sleeve 25 away from the housing 10 is provided with a horizontally penetrating guide groove 1 251. The inner wall of the limiting sleeve 25 is provided with a horizontally penetrating guide groove 252 at the top of the guide groove 1 251. The sides of the guide groove 1 251 and the guide groove 252 that are close to each other are provided with the same transition groove. The two ends of the transition groove are tangent to the guide groove 1 251 and the guide groove 252, respectively. A guide block 253 is rotatably provided on the inner wall of the transition groove on the limiting sleeve 25 near the end of the first guide groove 251. A torsion spring is provided at the rotatable connection between the guide block 253 and the transition groove. In the initial state, the end of the guide block 253 away from the transition groove extends into the first guide groove 251. A plurality of sliding columns 233 are fixed on the side wall of the rack rod 231 near the housing 10, which are evenly distributed along its length. A vertical sliding channel 232 is horizontally opened on the side wall of the rack sleeve 23 corresponding to the position of the sliding column 233. The sliding column 233 slides through the sliding channel 232 to the outside of the rack sleeve 23. The sliding column 233 can slide in the first guide groove 251, the second guide groove 252 and the transition groove.

[0023] It should be noted that during the frying process, the motor 20 inside the box 12 drives the turntable 21 to rotate. The turntable 21 drives the rack sleeve 23 to slide horizontally back and forth inside the box 12 through the rotating connecting rod 22. The rack rod 231 can slide vertically and freely in the mounting groove at the bottom of the rack sleeve 23. When the rack rod 231 falls freely, that is, when the sliding column 233 is at the bottom of the sliding channel 232, the fixed meshing teeth of the rack rod 231 protrude from the mounting groove and are on the same horizontal line as the meshing teeth on the rack sleeve 23. When the turntable 21 drives the rack sleeve 23 forward, the slide column 233 slides in the guide groove 251. At this time, the slide column 233 is restricted by the guide groove 251, so that the rack rod 231 can protrude out of the mounting groove and thus engage the transmission gear 24 to rotate normally. The guide block 253 smoothly transitions to the side wall and inner wall of the transition groove respectively. The end of the guide block 253 extends into the guide groove 251. When the sliding column 233 moves to the position of the guide block 253, it can naturally push open the guide block 253 and continue to slide in the guide groove 251. When the turntable 21 drives the rack sleeve 23 to retract, when the slide column 233 moves to the position of the guide block 253, the slide column 233 cannot push open the guide block 253 and slide into the transition groove under its guidance. Since the two ends of the transition groove are tangent to the first guide groove 251 and the second guide groove 252 respectively, the sliding becomes smoother. Then the sliding column 233 slides into the guide groove 252. At this time, the sliding column 233 moves into the guide groove 252, and the rack rod 231 retracts into the mounting groove. This avoids meshing with the transmission gear 24. Therefore, only the rack sleeve 23 meshes with the transmission gear 24. As a result, the rotational stroke of the transmission gear 24 during the backward movement is less than its rotational stroke during the forward movement, which causes the extension of the rack rod 231 to exhibit an intermittent change of "large forward movement and small backward movement". The motion is transmitted to the metal mesh belt 13 through the transmission gear 24 and the drive mechanism, causing the metal mesh belt 13 to intermittently retract and shake while conveying forward, so that the lotus seed slices are constantly turned and separated in the oil. Furthermore, after frying, this shaking can further prevent sticking or clumping and promote the drainage of oil. It is understood that the amplitude of this shaking is small and will not cause the lotus seed slices to break.

[0024] Please see the appendix Figure 6 The present invention provides a technical solution: both ends of the rack sleeve 23 along its length direction are fixed with fixing blocks 26, the fixing blocks 26 do not contact the limiting sleeve 25, a piston air pump 27 is fixed at the end of the fixing block 26 away from the limiting sleeve 25, the piston air pump 27 is fixed on the inner wall of the housing 12, the fixing block 26 slides on the inner wall of the housing 12, and an air supply pipe 121 is fixed on the outer wall of the housing 12 corresponding to the output end of the piston air pump 27; The piston-type air pump 27 is connected to the air supply pipe 121 at one end away from the fixed block 26. The air supply pipe 121 is connected to the side wall of the conveying part 101 and connected to the sealing plate 131 at the other end away from the housing 12. A connecting pipe is embedded in the sealing plate 131. One end of the connecting pipe is connected to the air supply pipe 121, and the other end of the connecting pipe is connected to the air bag 132. The outer wall of the air bag 132 is provided with a pressure relief hole, which is located on the side away from the transition part 102. A small one-way valve is provided in the pressure relief hole.

[0025] It should be noted that the piston-type air pump 27 supplies air into the air supply pipe 121 in one direction through piston movement. An additional one-way valve can be added to the air supply pipe 121 to prevent gas backflow. During the movement of the rack sleeve 23, the fixing blocks 26 at both ends of the rack sleeve 23 reciprocate, driving the piston rod of the piston air pump 27 to extend and retract. The compressed air generated by the piston air pump 27 is delivered to the connecting pipe embedded in the sealing plate 131 through the air supply pipe 121, and then enters the air bag 132, so that the air bag 132 is kept in an inflated state and tightly abuts against the end of the partition plate 14 to form a reliable seal. Excess gas is discharged from the pressure relief hole on the outer wall of the airbag 132 away from the transition part 102. The small one-way valve in the pressure relief hole is opened when the pressure reaches the set value. The discharged gas also carries away some of the heat transferred from the airbag 132 due to sliding friction and heat radiation from the processing part 103, preventing the temperature of the airbag 132 from rising continuously, extending the service life of the airbag 132, and thus ensuring the airtightness of this area.

[0026] Please see the appendix Figure 1 To be continued Figure 8 This invention provides a processing method for low-temperature drying of lotus seed chips, comprising: Step 1: Inject oil into the processing section 103 and start the vacuum generator 11 to evacuate the inside of the processing section 103; Step 2: Lotus seed slices fall onto the metal mesh belt 13 between two adjacent partition plates 14. The metal mesh belt 13 carries the lotus seed slices through the inclined transition section 102 and into the horizontally extending processing section 103. Step 3: The drive mechanism moves to cause the metal mesh belt 13 to reciprocate asymmetrically, shaking the lotus seed slices on it; Step 4: The drive mechanism synchronously drives the piston-type air pump 27 to supply air to the airbag 132, ensuring tight sliding contact between the partition plate 14 and the airbag 132, and ensuring the vacuum level of the processing section 103.

[0027] It should be noted that the end of the metal mesh belt 13 can extend to the outside of the conveyor section 101 for easy loading and unloading, and can be used in conjunction with the production line; The pre-treated lotus seed crisp raw material is conveyed to the conveying section 101 of the shell 10. At this time, the partition plate 14 on the metal mesh belt 13 moves to the position of the conveying section 101 along with the metal mesh belt 13. The processing section 103 is filled with vegetable oil for low-temperature frying of the lotus seed slices. The outer wall of the processing section 103 is provided with an oil filling port and an oil drain port on the side near the vacuum generator 11. Both the oil filling port and the oil drain port are provided with sealing caps. When the vacuum generator 11 is started, it draws a vacuum inside the processing section 103, reducing the absolute pressure inside the processing section 103 to the vacuum level required for low-temperature frying. It is understood that during the operation of the metal mesh belt 13, even if some outside air is carried in, it can be drawn out in time by the vacuum generator 11 to avoid any impact and is within the working load of the vacuum generator 11. Subsequently, the lotus seed slices fall onto the metal mesh belt 13 between two adjacent partition plates 14. The metal mesh belt 13 carries the lotus seed slices through the inclined transition section 102 into the horizontally extending processing section 103. The heating component on the bottom inner wall of the processing section 103 heats the oil to keep the oil temperature within the low-temperature frying range. The drive mechanism drives the metal mesh belt 13 to achieve asymmetrical reciprocating motion. Specifically, the drive mechanism drives the metal mesh belt 13 to achieve reciprocating motion with the forward stroke being greater than the backward stroke, thereby causing the lotus seed slices to vibrate and prevent them from clumping or adhering to the surface of the metal mesh belt 13. At the same time, the drive mechanism drives the piston-type air pump 27 to supply air to the airbag 132 in real time. The piston-type air pumps 27 at both ends supply air to the airbags 132 on both sides respectively, ensuring that the end of the partition plate 14 located inside the metal mesh belt 13 can slide in close contact with the airbag 132. Lotus seed slices are immersed in oil in a vacuum environment and dehydrated and puffed. After frying, the lotus seed slices continue to move forward with the metal mesh belt 13, passing through the transition section 102 at the other end to the conveyor section 101 on the other side. During the process of leaving the processing section 103 and moving to the transition section 102 at the other end, the intermittent shaking of the metal mesh belt 13 further assists in the dripping of oil adhering to the surface of the lotus seed slices, reducing oil adhesion. Finally, the finished lotus seed crisps are discharged from the conveying section 101, completing the low-temperature drying process.

Claims

1. A low-temperature drying processing device for lotus seed chips, comprising a shell (10), a vacuum generator (11), and a box (12), characterized in that: The housing (10) includes a horizontally extending processing section (103), with an upwardly inclined transition section (102) connected to both ends of the processing section (103). A horizontal conveying section (101) is connected to one end of the transition section (102) away from the processing section (103). The vacuum generating device (11) is in communication with the interior of the processing section (103). A metal mesh belt (13) is provided inside the housing (10). Multiple partition plates (14) are vertically arranged at equal intervals along the working direction of the metal mesh belt (13). The partition plates (14) extend into the interior of the metal mesh belt (13). Sealing components are provided on the side walls of the partition plates (14) away from the metal mesh belt (13). The partition plates (14) include a screen plate one (141) and a screen plate two (142) that are slidably connected to each other. A horizontal sealing plate (131) is provided on the side of the metal mesh belt (13) near the opening of the conveying part (101). The sealing plate (131) is fixed on the inner wall of the housing (10). An air bag (132) is fixed on one end of the vertical side wall of the sealing plate (131) near the transition part (102). The end of the partition plate (14) slides in contact with the air bag (132).

2. The low-temperature drying equipment for lotus seed chips as described in claim 1, characterized in that: Both the first sieve plate (141) and the second sieve plate (142) are provided with uniformly distributed sieve holes. When the first sieve plate (141) and the second sieve plate (142) are aligned at one end along the width direction of the metal mesh belt (13), their sieve holes are aligned with each other. When the first sieve plate (141) and the second sieve plate (142) are aligned at the other end along the width direction of the metal mesh belt (13), their sieve holes are staggered.

3. The low-temperature drying equipment for lotus seed chips as described in claim 2, characterized in that: Both ends of the second sieve plate (142) along its length direction are fixed with wedge blocks (143). The inclined surface of the wedge blocks (143) is set away from the second sieve plate (142). The side of the wedge blocks (143) away from the first sieve plate (141) slides against the second wedge block (144). The second wedge block (144) is fixed on the inner wall of the transition part (102). The second wedge block (144) does not contact the metal mesh belt (13). The conveying part (101) is provided with a guide groove at the position corresponding to the first wedge block (143). The first wedge block (143) slides and seals with the guide groove.

4. The low-temperature drying equipment for lotus seed chips as described in claim 1, characterized in that: The housing (12) is equipped with a drive mechanism, which includes a motor (20) fixed inside the housing (12). The output end of the motor (20) is connected to a turntable (21). The outer edge of the side wall of the turntable (21) away from the housing (10) is rotatably connected to a rotating connecting rod (22). The end of the rotating connecting rod (22) away from the turntable (21) is rotatably connected to a horizontal rack sleeve (23). The rack sleeve (23) slides horizontally on the inner wall of the housing (12). The bottom end of the rack sleeve (23) away from the rotating connecting rod (22) is meshed with a transmission gear (24).

5. The low-temperature drying equipment for lotus seed chips as described in claim 4, characterized in that: The rack sleeve (23) and the transmission gear (24) are fitted with the same limiting sleeve (25). The rack sleeve (23) and the limiting sleeve (25) are slidably connected. The transmission gear (24) is rotatably connected to the limiting sleeve (25). The bottom of the rack sleeve (23) is vertically provided with an installation groove on the side away from the rotating connecting rod (22). The rack rod (231) slides in the installation groove. The top of the inner wall of the limiting sleeve (25) away from the shell (10) is provided with a horizontally penetrating guide groove 1 (251). The inner wall of the limiting sleeve (25) is provided with a horizontally penetrating guide groove 2 (252) at the top of the guide groove 1 (251). The guide groove 1 (251) and the guide groove 2 (252) are provided with the same transition groove on the side that is close to each other. The two ends of the transition groove are tangent to the guide groove 1 (251) and the guide groove 2 (252) respectively.

6. The low-temperature drying processing equipment for lotus seed chips as described in claim 5, characterized in that: A guide block (253) is rotatably provided at the end of the transition groove near the guide groove one (251) on the inner wall of the limiting sleeve plate (25). A torsion spring is provided at the rotatable connection between the guide block (253) and the transition groove. In the initial state, the end of the guide block (253) away from the transition groove extends into the guide groove one (251). A plurality of sliding columns (233) are fixed on the side wall of the rack rod (231) near the housing (10) at equal intervals along its length. A vertical sliding channel (232) is horizontally opened on the side wall of the rack sleeve rod (23) corresponding to the position of the sliding column (233). The sliding column (233) slides through the sliding channel (232) to the outside of the rack sleeve rod (23). The sliding column (233) can slide in the guide groove one (251), the guide groove two (252) and the transition groove.

7. The low-temperature drying equipment for lotus seed chips as described in claim 4, characterized in that: The rack sleeve (23) has fixed blocks (26) at both ends along its length direction. The fixed blocks (26) do not contact the limiting sleeve (25). A piston air pump (27) is fixed at the end of the fixed block (26) away from the limiting sleeve (25). The piston air pump (27) is fixed on the inner wall of the box (12). The fixed blocks (26) slide on the inner wall of the box (12). An air supply pipe (121) is fixed on the outer wall of the box (12) corresponding to the output end of the piston air pump (27).

8. The low-temperature drying equipment for lotus seed chips as described in claim 7, characterized in that: The piston-type air pump (27) is connected to the air supply pipe (121) at one end away from the fixed block (26). The air supply pipe (121) is connected to the side wall of the conveying part (101) and connected to the sealing plate (131) at one end away from the box (12). A connecting pipe is embedded in the sealing plate (131). One end of the connecting pipe is connected to the air supply pipe (121), and the other end of the connecting pipe is connected to the air bag (132). A pressure relief hole is provided on the outer wall of the air bag (132). The pressure relief hole is located on the side away from the transition part (102). A small one-way valve is provided in the pressure relief hole.

9. A processing method for a low-temperature drying equipment for lotus seed crisps according to any one of claims 1-8, characterized in that, include: Step 1: Inject oil into the processing section (103), start the vacuum generator (11), and evacuate the processing section (103); Step 2: The lotus seed slices fall onto the metal mesh belt (13) between two adjacent partition plates (14). The metal mesh belt (13) carries the lotus seed slices through the inclined transition section (102) and into the horizontally extending processing section (103). Step 3: The drive mechanism moves to drive the metal mesh belt (13) to reciprocate asymmetrically, causing the lotus seed slices on it to shake. Step 4: The drive mechanism synchronously drives the piston-type air pump (27) to supply air to the airbag (132) to ensure close sliding contact between the partition plate (14) and the airbag (132) and to ensure the vacuum degree of the processing part (103).

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