Controlled atmosphere sterilization machine for longan storage and sterilization method

Abstract

The invention discloses a controlled atmosphere sterilization machine for longan storage and a sterilization method, and relates to the technical field of longan storage sterilization, the controlled atmosphere sterilization machine comprises a gas inlet pipe, the bottom end of the gas inlet pipe is communicated with a sterilization box, and gas subjected to plasma treatment enters the sterilization box through the gas inlet pipe; the device is used for creating a sterilization environment filled with plasma gas in a sterilization box so as to kill bacteria on longan epidermis in the sterilization box, a vacuum treatment box is fixed to the bottom of the sterilization box and comprises an outer box, and an inner box with an opening in the top is fixed in the outer box; and a preservation box sealing mechanism for sealing the longan in the preservation box is arranged at the top of the inner box. A sterilization environment filled with plasma gas is created in the sealing box, hot-pressing sealing operation is completed in the gas environment through the preservation box sealing mechanism, the structural design of the preservation box sealing mechanism is simplified, and the sealing cost of longan storage can be reduced on the premise that existing sterilization requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of longan storage sterilization, in particular to a controlled atmosphere sterilizing machine and a sterilization method for longan storage. Background Art

[0002] Modified atmosphere sterilization is a food preservation method that combines modified atmosphere packaging technology and plasma sterilization technology. Modified atmosphere technology inhibits the growth of microorganisms by changing the gas composition in the package (such as the ratio of oxygen, carbon dioxide and nitrogen), thereby extending the shelf life of food. Plasma sterilization technology forms an asymmetric plasma electric field through high-voltage and high-frequency pulse discharge, causing a large number of plasmas in the gas to collide step by step, producing electrochemical reactions. Under the condition of high-voltage electric field, the medium gas is in a highly ionized state, forming a variety of active groups and particles, which react with microorganisms in various ways, causing cell structure damage and ultimately death, thereby efficiently killing viruses, sterilizing, removing odors, eliminating smoke, and removing dust, without producing toxic and harmful substances.

[0003] This technology is now widely used in the storage and packaging of various types of fresh foods, especially in the storage of various fruits and vegetables. In order to extend the shelf life of fruits, longan merchants also apply this technology to longan storage. The actual application of controlled atmosphere sterilization technology often includes the following steps: placing longan in a fresh-keeping box → coating the fresh-keeping box → evacuating the inside of the fresh-keeping box → injecting plasma-treated gas into the fresh-keeping box. The above operation process requires that the inside of each fresh-keeping box be evacuated separately, and each fresh-keeping box be filled with gas separately. This requires that each hot pressing sealing device needs to be equipped with a special exhaust mechanism and an air filling mechanism, which makes the structure of the equipment complex and the design accuracy requirements increased, ultimately leading to an increase in the cost of fruit storage. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a controlled atmosphere sterilizer and a sterilization method for longan storage, which creates a sterilization environment filled with plasma gas in a sealed box, utilizes a fresh-keeping box sealing mechanism to complete a hot-pressing sealing operation in the gas environment, simplifies the structural design of the fresh-keeping box sealing mechanism, and enables the present invention to reduce the sealing cost of longan storage while meeting existing sterilization requirements.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a controlled atmosphere sterilizer for longan storage, including an air inlet pipe, the bottom end of which is connected to a sterilization box, and the gas treated by plasma enters the sterilization box through the air inlet pipe, which is used to create a sterilization environment filled with plasma gas inside the sterilization box to eliminate bacteria on the longan epidermis in the sterilization box. The gas is a mixed gas of nitrogen, oxygen and carbon dioxide, which can form a variety of active groups and particles after plasma treatment, destroy the cell structure of microorganisms, and achieve the sterilization effect.

[0006] A vacuum treatment box is fixed at the bottom of the sterilization box, and the vacuum treatment box includes an outer box, an inner box with an opening at the top is fixed inside the outer box, and a fresh-keeping box sealing mechanism for sealing the longan in the fresh-keeping box is provided at the top of the inner box; A vacuum pump for evacuating the interior of the inner box is provided on the rear side of the outer box, a connected feed port is provided on the front side of the outer box and the front side of the inner box, a connected discharge port is provided on one side of the outer box and the side of the inner box, an opening sealing mechanism for sealing the top opening of the inner box is installed on the top of the inner box, a feed port sealing mechanism for sealing the feed port and a discharge port sealing mechanism for sealing the discharge port are installed inside the inner box.

[0007] Preferably, the fresh-keeping box sealing mechanism comprises a support frame installed on the top of the inner box, a sealing plate that can move up and down is installed inside the support frame, a sealing table for holding the fresh-keeping box is provided at the bottom end of the sealing plate, two workstations are provided on the sealing table, and the hot-pressing sealing work of two fresh-keeping boxes can be completed at the same time, sealing table supports are provided on both sides of the sealing table, and the two sealing table supports are arranged in a mirror image, and the sealing table is driven by the sealing table lifting assembly to drive the fresh-keeping box to move up and down between the inner box and the sterilization box; A rolled plastic sealing film is rotatably connected to one side of the top of the support frame, and guide rollers for guiding the plastic sealing film are installed on both sides of the bottom of the support frame. A winding shaft for winding the plastic sealing film is rotatably connected to the other side of the top plate of the support frame. The plastic sealing film passes around the two guide rollers in sequence and is located on the top of the sealing platform. The sealing plate then moves down to hot-press the plastic sealing film at the opening position of the fresh-keeping box to achieve sealing of the longan in the fresh-keeping box. After hot-pressing and sealing, the excess plastic sealing film is wound up by the winding shaft.

[0008] Preferably, the sealing table lifting assembly includes two hydraulic cylinders a installed at the bottom of the sealing table, and the hydraulic cylinders a drive the sealing table to move up and down. A C-shaped bracket is fixed to the outer end of the hydraulic cylinder a, and a threaded rod a is threadedly connected in the C-shaped bracket. The threaded rod a passes through the C-shaped bracket and drives the C-shaped bracket to drive the hydraulic cylinder a to move up and down.

[0009] Preferably, a loading mechanism for moving the fresh-keeping box containing longan to the inside of the sealing table is provided on one side of the inner box; The loading mechanism includes a loading platform at the same height as the sealing platform after it moves downward, a baffle that can move up and down is provided at the bottom of the loading platform, a push plate is provided on one side of the top of the loading platform, and a pushing bracket for driving the push plate to move is provided on one side of the push plate, one end of the pushing bracket is threadedly connected with a threaded rod b, and the rotating threaded rod b drives the pushing bracket to drive the push plate to move on the top of the loading platform, so as to push the fresh-keeping box moved to the top of the loading platform to the sealing platform.

[0010] Preferably, a fresh-keeping box lifting mechanism for outputting the sealed fresh-keeping boxes is provided inside the inner box; The fresh-keeping box lifting mechanism includes two lifting heads located at the bottom of the sealing table, and the lifting heads are driven by the lifting cylinder at the bottom to move up and down. A belt conveyor is provided on one side of the discharge port in the inner box, and the top of the belt conveyor is flush with the top of the sealing table after the downward movement. The lower part of the discharge port in the inner box is processed into an inclined surface. The upward lifting head pushes the sealed fresh-keeping box embedded in the sealing table to move upward, and then the push plate pushes the fresh-keeping box before sealing to move toward the sealing table. At the same time, the fresh-keeping box before sealing pushes the sealed fresh-keeping box to the top of the belt conveyor. Finally, the belt conveyor transports the sealed fresh-keeping box to the discharge port so that it moves down along the inclined surface in the discharge port.

[0011] Preferably, the opening blocking mechanism comprises two blocking plates a blocking the top opening of the inner box, the two blocking plates a are arranged in a mirror image, an iron plate is fixed to the ends of the two blocking plates a away from each other, the top of the inner box and the contact position are inlaid with electromagnets, the electromagnets adsorb the iron plates to fix the positions of the blocking plates a after being energized, a plurality of springs a in a stretched state are fixed to the side of the iron plate away from the blocking plates a, and the springs a pull the blocking plates a out of the top opening of the inner box after the electromagnets are powered off; The feed port blocking mechanism includes a blocking plate b inserted into the inner box, and the blocking plate b is driven by a hydraulic cylinder b at the bottom to move up and down; The discharge port blocking mechanism comprises a blocking plate c inserted in the inner box, a triangular bracket is fixed at the bottom of the blocking plate c, and a hydraulic cylinder c for driving the blocking plate c to move up and down is fixed at the bottom of the triangular bracket.

[0012] Preferably, an arc groove is provided on one side of the two blocking plates a that are close to each other, an arc-shaped sealing ring is fixed in the arc groove, and the sealing ring is tightly fitted with the outside of the mobile end extended from the hydraulic cylinder a, and two short plates are inserted into one of the blocking plates a, and a plurality of springs b are fixed at one end of the short plate, and the springs b push the short plate to block the arc groove between the two blocking plates a when the mobile end of the hydraulic cylinder a retracts; The opening sealing mechanism, the sealing plate b and the sealing plate c are all wrapped with sealing strips to seal the gaps between the opening sealing mechanism, the feed port sealing mechanism, the discharge port sealing mechanism and the inner box.

[0013] Preferably, a feed conveyor is provided on the front side of the outer box, and the feed conveyor is located below the feed port; A discharge conveyor is provided on one side of the outer box. The discharge conveyor is located below the discharge port. The width of the discharge conveyor is twice the width of the feed conveyor.

[0014] Preferably, the sterilization box comprises a sealed box, a sealed door is installed on one of the outer walls of the sealed box, and the remaining outer walls of the sealed door are all installed with transparent observation windows; Pressure gauges are installed on the front side of the sealed box and the rear side of the outer box. The pressure gauge installed on the sealed box is used to monitor the air pressure inside the sealed box, and the pressure gauge installed on the rear side of the outer box is used to monitor the air pressure inside the inner box. A strobe alarm light for alarming is arranged on one side of the top of the sealing box, and a control box for receiving monitoring data of a pressure gauge is arranged on the front side of the sealing box. The strobe alarm light, the feeding conveyor and the discharging conveyor are all controlled by the control box.

[0015] The present invention also includes a sterilization method using the above-mentioned atmosphere-controlled sterilizer for longan storage, and the specific steps are as follows: S1, the sealing plate b is controlled by the hydraulic cylinder b to move downward, the feed port in the inner box is opened, and then the staff puts the fresh-keeping boxes containing longan on the top of the feed conveyor in turn, and the feed conveyor conveys the fresh-keeping boxes to move through the feed port to the inner box; S2, when a fresh-keeping box moves to one side of the top of the loading platform, the baffle rises, and then another fresh-keeping box moves to the side of the baffle. At this time, the blocking plate b moves up to block the feed inlet, and then the push plate is driven by the rotating threaded rod b to move on the top of the loading platform, and at the same time, the two fresh-keeping boxes on one side are pushed to the two stations on the sealing platform respectively; S3, the control box controls the vacuum pump to start, and the air inside the inner box is extracted, so that the inner box is in a vacuum environment; S4, the control box controls the two electromagnets to cut off the power, so that the blocking plate a is moved out from the top opening of the inner box under the pulling of the spring a, and then the sealing table lifting assembly drives the sealing table to move up, through the top opening of the inner box to the inside of the inner box, and then the electromagnet is powered on again, the adsorption iron plate drives the blocking plate a to be re-inserted back to the top opening position of the inner box, and the top opening of the inner box is blocked; S5, the gas treated by plasma is filled into the sterilization box through the air inlet pipe, a sterilization environment is created in the sterilization box, and then the sealing plate is started to seal the fresh-keeping box containing longan, and the plasma gas is encapsulated in the fresh-keeping box; S6, the control box controls the two electromagnets to be powered off again, so that the blocking plate a is moved out from the top opening of the inner box under the pulling of the spring a, and then the sealing table lifting assembly drives the sealing table to drive the sealed fresh-keeping box to move down until it moves into the inner box, and then the electromagnet is powered on again, and the adsorption iron plate drives the blocking plate a to be re-inserted back to the top opening position of the inner box, and the top opening of the inner box is re-blocked; S7, the lifting cylinder drives the lifting head to move up, pushing the two sealed fresh-keeping boxes embedded in the sealing table to move up, and then repeating the above step S1, conveying the two new fresh-keeping boxes before sealing to the top of the loading table, and the push plate pushes them toward the sealing table, so that the fresh-keeping boxes before sealing can push the sealed fresh-keeping boxes to the top of the belt conveyor, and the belt conveyor moves the sealed fresh-keeping boxes to the discharge port, so that they move down along the inclined surface at the bottom of the discharge port to the top of the discharge conveyor for output.

[0016] Compared with the prior art, the present invention provides a controlled atmosphere sterilizer and sterilization method for longan storage, which has the following beneficial effects: 1. In view of the prior art method of treating each fresh-keeping box individually, the present invention proposes for the first time to create a sterilization environment filled with plasma gas in a sealed box, and utilizes a fresh-keeping box sealing mechanism to complete a hot-pressing sealing operation in the gas environment, thereby simplifying the structural design of the fresh-keeping box sealing mechanism. This enables the present invention to reduce the sealing cost of longan storage while meeting the existing sterilization requirements.

[0017] 2. The present invention extracts the gas inside the inner box and the sealed box before hot-pressing and sealing. On the one hand, it can avoid the influence of microorganisms in the external gas on the storage of longan. On the other hand, it can also directly place the fresh-keeping box in a vacuum environment, eliminating the operation step of separately vacuuming the fresh-keeping box in the prior art, further simplifying the structural design and reducing the storage cost of longan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the first view of the overall structure of the present invention; Figure 2 It is the second view of the overall structure of the present invention; Figure 3 It is a structural schematic diagram of the sealing mechanism and the inner box of the fresh-keeping box of the present invention; Figure 4 It is a structural schematic diagram of the outer box and the inner box of the present invention; Figure 5 It is a schematic diagram of the internal structure of the inner box of the present invention; Figure 6 It is a schematic diagram of the sealing station of the present invention on the top of the inner box; Figure 7 It is a schematic diagram of the sealing station of the present invention inside the inner box; Figure 8 It is a structural schematic diagram of the blocking plate a and the short plate of the present invention; Fig. 9 It is a structural schematic diagram of the feeding mechanism of the present invention; Fig.10 It is a schematic diagram of the feeding mechanism and the fresh-keeping box lifting mechanism of the present invention; In the figure: 1 air inlet pipe, 2 sterilization box, 3 vacuum treatment box, 4 feed port, 5 feed conveyor, 6 discharge port, 7 discharge conveyor, 8 pressure gauge, 9 strobe alarm light, 10 control box, 11 vacuum pump; 21 sealed box, 22 sealed door, 23 observation window; 31 outer box, 32 inner box, 33 fresh-keeping box sealing mechanism, 34 sealing platform lifting assembly, 35 feeding mechanism, 36 fresh-keeping box lifting mechanism, 37 opening blocking mechanism, 38 feed port blocking mechanism, 39 discharge port blocking mechanism; 331 support frame, 332 sealing plate, 333 sealing table, 334 plastic sealing film, 335 guide roller, 336 reel, 337 sealing table support; 341 hydraulic cylinder a, 342 C-type bracket, 343 threaded rod a; 351 loading table, 352 baffle, 353 push plate, 354 push bracket, 355 threaded rod b; 361 lifting head, 362 lifting cylinder, 363 belt conveyor; 371 blocking plate a, 372 iron plate, 373 spring a, 374 sealing ring, 375 short plate, 376 spring b, 377 electromagnet; 381 blocking plate b, 382 hydraulic cylinder b; 391 blocking plate c, 392 triangular bracket, 393 hydraulic cylinder c. DETAILED DESCRIPTION

[0019] The preferred specific embodiments for implementing the present invention are described in detail below, and a clear and complete description is made in conjunction with the accompanying drawings.

[0020] like Figure 1 and 2 As shown, the present invention provides a controlled atmosphere sterilizer for longan storage, comprising an air inlet pipe 1, the bottom end of which is connected to a sterilization box 2, and the gas treated by plasma enters the sterilization box 2 through the air inlet pipe 1, so as to create a sterilization environment filled with plasma gas inside the sterilization box 2, so as to eliminate bacteria on the longan epidermis in the sterilization box 2; Moreover, a vacuum treatment box 3 is fixed at the bottom of the sterilization box 2, and the vacuum treatment box 3 includes an outer box 31, an inner box 32 with a top opening is fixed inside the outer box 31, an opening blocking mechanism 37 for blocking the top opening of the inner box 32 is installed on the top of the inner box 32, and a vacuum pump 11 for evacuating the inside of the inner box 32 is provided at the rear side of the outer box 31; like Figure 5-8As shown, the opening blocking mechanism 37 includes two blocking plates a371 blocking the top opening of the inner box 32, and the blocking plates a371 are wrapped with sealing strips all around to block the gap between the blocking plates a371 and the inner box 32. The two blocking plates a371 are arranged in a mirror image, and the ends of the two blocking plates a371 away from each other are fixed with iron plates 372, and the positions where the top of the inner box 32 contacts 317 are inlaid with electromagnets 377, and the electromagnets 377 adsorb the iron plates 372 to fix the positions of the blocking plates a371 when energized, and a plurality of springs a373 in a stretched state are fixed to the side of the iron plates 372 away from the blocking plates a371, and the springs a373 pull the blocking plates a371 out of the top opening of the inner box 32 after the electromagnets 377 are powered off; By pulling out the sealing plate a371 from the top opening of the inner box 32, the interior of the sterilization box 2 is connected to the interior of the inner box 32, and then the air in the sterilization box 2 and the inner box 32 can be extracted in advance by the vacuum pump 11 to maintain a vacuum environment inside the sterilization box 2. Then, the sealing plate a371 is inserted into the top opening of the inner box 32 to separate the interior of the sterilization box 2 and the interior of the inner box 32 into two independent spaces. Then, plasma gas is input into the sterilization box 2 through the air inlet pipe 1, thereby creating a sterilization gas atmosphere filled with plasma gas in the sterilization box 2, and eliminating the influence of microorganisms existing in the original air inside the sterilization box 2 on the preservation of longan.

[0021] like Figure 2 As shown, the sterilization box 2 in the present invention includes a sealed box 21, a sealed door 22 is installed on one of the outer walls of the sealed box 21, and transparent observation windows 23 are installed on the remaining outer walls of the sealed door 22 to facilitate the staff to observe the processing conditions inside the sealed box 21; Moreover, pressure gauges 8 are installed on the front side of the sealed box 21 and the rear side of the outer box 31. The pressure gauge 8 installed on the sealed box 21 is used to monitor the air pressure inside the sealed box 21, and the pressure gauge 8 installed on the rear side of the outer box 31 is used to monitor the air pressure inside the inner box 32. A strobe alarm light 9 for alarm is provided on one side of the top of the sealed box 21. The strobe alarm light 9 can alarm when the air pressure inside the sealed box 21 and the inner box 32 changes abnormally, reminding the staff to check and eliminate the danger in time.

[0022] A control box 10 for receiving monitoring data of the pressure gauge 8 is provided on the front side of the sealing box 21. The control box 10 can be used to control all electrical components in the present invention to achieve centralized control for the convenience of operation by staff.

[0023] The top of the inner box 32 of the present invention is provided with a fresh-keeping box sealing mechanism 33 for sealing the longan in the fresh-keeping box. The fresh-keeping box sealing mechanism 33 is installed inside the sealing box 21, so that the present invention can complete the hot pressing work of the longan fresh-keeping box in a sterilization environment filled with plasma gas; Specific as Figure 4-7 As shown in Figure 9, the fresh-keeping box sealing mechanism 33 includes a support frame 331 installed on the top of the inner box 32, a sealing plate 332 that can move up and down is installed inside the support frame 331, a sealing table 333 for holding the fresh-keeping boxes is provided at the bottom of the sealing plate 332, and two workstations are provided on the sealing table 333, which can complete the hot pressing and sealing work of two fresh-keeping boxes at the same time, and sealing table supports 337 are provided on both sides of the sealing table 333. The two sealing table supports 337 are arranged in mirror image, and a rolled plastic film 334 is rotatably connected to one side of the top of the support frame 331, and guide rollers 335 for guiding the plastic film 334 are installed on both sides of the bottom of the support frame 331, and a reel 336 for reeling in the plastic film 334 is rotatably connected to the other side of the top plate of the support frame 331; When sealing the fresh-keeping box containing longans, the plastic sealing film 334 needs to be passed around the two guide rollers 335 in sequence in advance and positioned on the top of the sealing platform 333, and then the sealing plate 332 is started, and the sealing plate 332 moves downward to hot-press the plastic sealing film 334 at the opening position of the fresh-keeping box to achieve sealing of the longans in the fresh-keeping box, and then the winding shaft 336 is driven to rotate to wind up the scraps of the plastic sealing film 334 remaining after the hot-pressing sealing.

[0024] The sealing platform 333 is driven by the sealing platform lifting assembly 34 to drive the fresh-keeping box to move up and down between the inner box 32 and the sterilization box 2. Figure 6 As shown, the sealing table lifting assembly 34 includes two hydraulic cylinders a341 installed at the bottom of the sealing table 333. The hydraulic cylinder a341 drives the sealing table 333 to move up and down. A C-shaped bracket 342 is fixed to the outer end of the hydraulic cylinder a341. A threaded rod a343 is threadedly connected in the C-shaped bracket 342. The threaded rod a343 penetrates the C-shaped bracket 342 and drives the C-shaped bracket 342 to drive the hydraulic cylinder a341 to move up and down. The threaded rod a343 is driven to rotate by a forward and reverse motor. This technical means is a mature existing technology, so it is not further described in the present invention. The rotation of the threaded rod a343 can drive the C-shaped bracket 342 and the hydraulic cylinder a341 to move upward, and the extension of the moving end of the hydraulic cylinder a341 can push the sealing platform 333 to move below the sealing plate 332. At this time, the moving end of the hydraulic cylinder a341 passes between the two blocking plates a371. Figure 6 and 9 As shown, in order to ensure the sealing effect of the two blocking plates a371 on the top opening of the inner box 32, arc grooves are provided on the adjacent sides of the two blocking plates a371, and arc-shaped sealing rings 374 are fixed in the arc grooves. The sealing rings 374 are tightly fitted to the outer part of the moving end of the hydraulic cylinder a341; When the sealing platform 333 is moved downward, the sealing platform 333 needs to be initially moved downward by retracting the movable end of the hydraulic cylinder a341. At this time, the position relationship between the blocking plate a371 and the hydraulic cylinder a341 is as follows: Figure 7 As shown, in order to ensure the sealing effect of the two blocking plates a371 on the top opening of the inner box 32, two short plates 375 are inserted in one of the blocking plates a371, and multiple springs b376 are fixed to one end of the short plate 375. When the moving end of the hydraulic cylinder a341 retracts, the spring b376 pushes the short plate 375 to block the arc groove between the two blocking plates a371; and then the turning of the threaded rod a343 is used to further drive the sealing platform 333 to move down to the position as shown in FIG. Figure 7 Position shown.

[0025] Before hot pressing, the fresh-keeping box containing longan needs to be transported to the inner box 32. Figure 1 and 2 As shown, the front side of the outer box 31 and the front side of the inner box 32 are provided with a connected feed port 4, and as shown in FIG. Figure 6 As shown, a feed port blocking mechanism 38 for blocking the feed port 4 is installed inside the inner box 32, and the feed port blocking mechanism 38 includes a blocking plate b381 plugged into the inner box 32, and the blocking plate b381 is wrapped with sealing strips around it, which can block the gap between the blocking plate b381 and the inner box 32, and the blocking plate b381 is driven by a hydraulic cylinder b382 at the bottom to move up and down, and a feed conveyor 5 is provided on the front side of the outer box 31, and the feed conveyor 5 is located below the feed port 4. The staff first controls the hydraulic cylinder b382 to drive the blocking plate b381 to move downward to open the feed port 4, and then places the fresh-keeping box containing longan on the top of the feed conveyor 5, and the feed conveyor 5 drives it to pass through the feed port 4 and move to the inside of the inner box 32; Next, in order to move the fresh-keeping box containing longan to a designated position, the designated position is as follows: Figure 7 As shown, the sealing station 333 is moved down. Figure 5 and 7 As shown, a loading mechanism 35 for moving the fresh-keeping box containing longan to the inside of the sealing station 333 is provided on one side of the inner box 32; Specifically, the loading mechanism 35 includes a loading platform 351 of the same height as the sealing platform 333 after the downward movement, a baffle 352 that can move up and down is provided at the bottom of the loading platform 351, a push plate 353 is provided on one side of the top of the loading platform 351, and a push bracket 354 for driving the push plate 353 to move is provided on one side of the push plate 353, and a threaded rod b355 is threadedly connected to one end of the push bracket 354, and the rotating threaded rod b355 drives the push bracket 354 to drive the push plate 353 to move on the top of the loading platform 351. The rotation of the threaded rod b355 in the present invention is also driven by the forward and reverse motors. This technical means is a mature existing technology, so it is not further described in the present invention; During the conveying process, the above-mentioned feeding conveyor 5 will move multiple packaging boxes containing longan to the top of the loading platform 351. When a fresh-keeping box moves to the side of the top of the loading platform 351, the baffle 352 rises, and then the other fresh-keeping box moves to the side of the baffle 352. At this time, the sealing plate b381 moves up to block the feed port 4, and then the push plate 353 is driven by the rotating threaded rod b355 to move on the top of the loading platform 351, and at the same time, the two fresh-keeping boxes on one side are pushed to the two workstations on the sealing platform 333 respectively to complete the loading.

[0026] Next, the control box 10 controls the vacuum pump 11 to start, and the air inside the inner box 32 is pumped out, so that the inner box 32 is in a vacuum environment, and the fresh-keeping box can also be in a vacuum environment, and there is no need to perform vacuum pumping operation on each fresh-keeping box separately, which is conducive to reducing the difficulty of operation. At this time, the blocking plate a371 blocks the top opening of the inner box 32, and the blocking plate b381 blocks the feed port 4; Then, the control box 10 controls the two electromagnets 377 to cut off the power, so that the sealing plate a371 is moved out from the top opening of the inner box 32 under the pulling of the spring a373, and then the sealing table lifting assembly 34 is used to drive the sealing table 333 to move upward, so that it passes through the top opening of the inner box 32 and moves to the inside of the sealed box 21. Then the electromagnet 377 is powered on again, and the adsorption iron plate 372 drives the sealing plate a371 to be reinserted into the top opening position of the inner box 32 to seal the top opening of the inner box 32. At this time, the gas treated with plasma is filled into the sealed box 21 through the air inlet pipe 1, creating a sterilization environment in the sealed box 21, which helps to kill the microorganisms on the epidermis of longan. Then the sealing plate 332 is started to seal the fresh-keeping box containing longan, and the plasma gas can be encapsulated in the fresh-keeping box to kill the microorganisms attached to the epidermis of the longan again. At the same time, the plasma gas in the fresh-keeping box also helps to inhibit the growth of microorganisms in the daily storage of longan. Compared with the prior art, the present invention does not need to fill each fresh-keeping box with plasma gas separately, which is conducive to further reducing the difficulty of operation.

[0027] After the fresh-keeping box containing longan is sealed, it needs to be removed from the inner box 32. Figure 1 and 2As shown, a connected discharge port 6 is provided on one side of the outer box 31 and one side of the inner box 32, a discharge conveyor 7 is provided on one side of the outer box 31, the discharge conveyor 7 is located below the discharge port 6, the width of the discharge conveyor 7 is twice the width of the feed conveyor 5, and a feed port blocking mechanism 38 for blocking the feed port 4 and a discharge port blocking mechanism 39 for blocking the discharge port 6 are installed inside the inner box 32, the discharge port blocking mechanism 39 includes a blocking plate c391 inserted into the inner box 32. The blocking plate c391 is wrapped with a sealing strip for sealing the gap between it and the inner box 32, a triangular bracket 392 is fixed to the bottom of the blocking plate c391, and a hydraulic cylinder c393 for driving the blocking plate c391 to move up and down is fixed to the bottom of the triangular bracket 392, when the vacuum pump 11 is used to evacuate the inside of the inner box 32 and the inside of the sealing box 21, the blocking plate c391 is in a blocking state for the discharge port 6; In order to achieve the purpose of outputting the sealed fresh-keeping box, the fresh-keeping box in the sealed box 21 needs to be moved to the inside of the inner box 32 first. At this time, the control box 10 can control the two electromagnets 377 to be de-energized, so that the sealing plate a371 is moved out from the top opening of the inner box 32 under the pulling of the spring a373, and then the sealing table lifting assembly 34 drives the sealing table 333 to drive the sealed fresh-keeping box to move downward until it moves to the inside of the inner box 32, and then the electromagnet 377 is powered on again, and the adsorption iron plate 372 drives the sealing plate a371 to be re-inserted back to the top opening position of the inner box 32, and the top opening of the inner box 32 is re-sealed to prevent the external gas from entering the sealed box 21 through the top opening of the inner box 32 after the sealing plate c391 moves downward; A fresh-keeping box lifting mechanism 36 is provided inside the inner box 32 for outputting the sealed fresh-keeping box. Specifically, Fig.10 As shown, the fresh-keeping box lifting mechanism 36 includes two lifting heads 361 located at the bottom of the sealing platform 333. The lifting heads 361 are driven by the lifting cylinder 362 at the bottom to move up and down. A belt conveyor 363 is provided on one side of the discharge port 6 in the inner box 32. The top of the belt conveyor 363 is flush with the top of the sealing platform 333 after the downward movement. The lower part of the discharge port 6 in the inner box 32 is processed into an inclined surface. The lifting head 361 is driven upward by the lifting cylinder 362, and the lifted head 361 is used to push the sealed fresh-keeping box embedded in the sealing platform 333 upward. At this time, the push plate 353 pushes the fresh-keeping box before sealing to move toward the sealing platform 333, and then the fresh-keeping box before sealing pushes the sealed fresh-keeping box to the top of the belt conveyor 363. Finally, the belt conveyor 363 conveys the sealed fresh-keeping box to the discharge port 6, so that it can move down along the inclined surface in the discharge port 6 to the top of the discharge conveyor 7, and the discharge conveyor 7 outputs the sealed and sterilized fresh-keeping box.

[0028] The specific operation process of the present invention is as follows: S1, the hydraulic cylinder b382 controls the blocking plate b381 to move downward, and the feed port 4 in the inner box 32 is opened. Then the staff sequentially places the fresh-keeping boxes containing longan on the top of the feed conveyor 5, and the feed conveyor 5 conveys the fresh-keeping boxes so that the fresh-keeping boxes pass through the feed port 4 and move to the inside of the inner box 32; S2, when one fresh-keeping box moves to the top side of the loading platform 351, the baffle 352 rises, and then another fresh-keeping box moves to the side of the baffle 352. At this time, the blocking plate b381 moves up to block the feed port 4, and then the push plate 353 is driven by the rotating threaded rod b355 to move on the top of the loading platform 351, and at the same time, the two fresh-keeping boxes on one side are pushed to the two stations on the sealing platform 333 respectively; S3, the control box 10 controls the vacuum pump 11 to start, and the air inside the inner box 32 is extracted, so that the inner box 32 is in a vacuum environment; S4, the control box 10 controls the two electromagnets 377 to be de-energized, so that the blocking plate a371 is moved out from the top opening of the inner box 32 under the pulling of the spring a373, and then the sealing table lifting assembly 34 drives the sealing table 333 to move upward, through the top opening of the inner box 32 and move to the inside of the inner box 32, and then the electromagnet 377 is powered on again, and the adsorption iron plate 372 drives the blocking plate a371 to be re-inserted into the top opening position of the inner box 32, so as to block the top opening of the inner box 32; S5, the gas treated by plasma is filled into the sterilization box 2 through the air inlet pipe 1, a sterilization environment is created in the sterilization box 2, and then the sealing plate 332 is started to seal the fresh-keeping box containing longan, and the plasma gas is encapsulated in the fresh-keeping box; S6, the control box 10 controls the two electromagnets 377 to be powered off again, so that the blocking plate a371 is moved out from the top opening of the inner box 32 under the pulling of the spring a373, and then the sealing table lifting assembly 34 drives the sealing table 333 to move the sealed fresh-keeping box downward until it moves into the inner box 32, and then the electromagnet 377 is powered on again, and the adsorption iron plate 372 drives the blocking plate a371 to be re-inserted into the top opening position of the inner box 32, and the top opening of the inner box 32 is re-blocked; S7, the lifting head 361 is driven upward by the lifting cylinder 362 to push the two sealed fresh-keeping boxes embedded in the sealing platform 333 upward, and then the above step S1 is repeated to convey the two new fresh-keeping boxes before sealing to the top of the loading platform 351, and the push plate 353 pushes them toward the sealing platform 333, so that the fresh-keeping boxes before sealing can push the sealed fresh-keeping boxes to the top of the belt conveyor 363, and the belt conveyor 363 moves the sealed fresh-keeping boxes to the discharge port 6, so that they move down along the inclined surface at the bottom of the discharge port 6 to the top of the discharge conveyor 7 for output.

[0029] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without creative work still fall within the protection scope of the present invention.

Claims

1. A controlled atmosphere sterilizer for longan storage, characterized in that: It comprises an air inlet pipe (1), the bottom end of which is connected to a sterilization box (2), and gas that has been subjected to plasma treatment enters the sterilization box (2) through the air inlet pipe (1), so as to create a sterilization environment filled with plasma gas inside the sterilization box (2) to eliminate bacteria on the surface of longan in the sterilization box (2); A vacuum treatment box (3) is fixed at the bottom of the sterilization box (2), the vacuum treatment box (3) comprises an outer box (31), an inner box (32) with an open top is fixed inside the outer box (31), and a fresh-keeping box sealing mechanism (33) for sealing the longan in the fresh-keeping box is provided at the top of the inner box (32); A vacuum pump (11) for evacuating the interior of the inner box (32) is provided at the rear side of the outer box (31), a feed port (4) is provided at the front side of the outer box (31) and the front side of the inner box (32), a discharge port (6) is provided at one side of the outer box (31) and the side of the inner box (32), an opening blocking mechanism (37) for blocking the top opening of the inner box (32) is installed at the top of the inner box (32), and a feed port blocking mechanism (38) for blocking the feed port (4) and a discharge port blocking mechanism (39) for blocking the discharge port (6) are installed inside the inner box (32).

2. The controlled atmosphere sterilizer for longan storage according to claim 1, characterized in that: The fresh-keeping box sealing mechanism (33) comprises a support frame (331) mounted on the top of the inner box (32); a sealing plate (332) capable of moving up and down is mounted inside the support frame (331); a sealing table (333) for placing the fresh-keeping box is provided at the bottom end of the sealing plate (332); sealing table supports (337) are provided on both sides of the sealing table (333); the two sealing table supports (337) are arranged in a mirror-like manner; the sealing table (333) is driven by the sealing table lifting assembly (34) to drive the fresh-keeping box to move up and down between the inner box (32) and the sterilization box (2); A rolled plastic film (334) is rotatably connected to one side of the top of the support frame (331), and guide rollers (335) for guiding the plastic film (334) are installed on both sides below the support frame (331). A reel (336) for reeling up the plastic film (334) is rotatably connected to the other side of the top plate of the support frame (331). The plastic film (334) passes over the two guide rollers (335) in sequence and is located on the top of the sealing platform (333). The sealing plate (332) then moves downward to heat-press the plastic film (334) at the opening of the fresh-keeping box, thereby sealing the longan in the fresh-keeping box. After the heat-pressing and sealing, the excess plastic film (334) is reeled up by the reel (336).

3. The gas-controlled sterilizing machine for longan storage according to claim 2, characterized in that: The sealing table lifting assembly (34) comprises two hydraulic cylinders a (341) installed at the bottom of the sealing table (333), the hydraulic cylinders a (341) driving the sealing table (333) to move up and down, a C-shaped bracket (342) being fixed to the outer end of the hydraulic cylinder a (341), a threaded rod a (343) being threadedly connected in the C-shaped bracket (342), the threaded rod a (343) passing through the C-shaped bracket (342) and driving the C-shaped bracket (342) to drive the hydraulic cylinder a (341) to move up and down.

4. The gas-controlled sterilizing machine for longan storage according to claim 2, characterized in that: A loading mechanism (35) for moving the fresh-keeping box containing longans to the inside of the sealing table (333) is provided on one side of the inner box (32); The loading mechanism (35) comprises a loading platform (351) of the same height as the sealing platform (333) after the material loading platform (351) is moved downward, a baffle (352) is provided at the bottom of the loading platform (351) and is movable upward and downward, a push plate (353) is provided at one side of the top of the loading platform (351), a push bracket (354) for driving the push plate (353) to move is provided at one side of the push plate (353), one end of the push bracket (354) is threadedly connected to a threaded rod b (355), and the rotating threaded rod b (355) drives the push bracket (354) to drive the push plate (353) to move on the top of the loading platform (351), so as to push the fresh-keeping box moved to the top of the loading platform (351) to move into the sealing platform (333).

5. The controlled atmosphere sterilizing machine for longan storage according to claim 4, characterized in that: The inner box (32) is provided with a fresh-keeping box lifting mechanism (36) for outputting the sealed fresh-keeping boxes; The fresh-keeping box lifting mechanism (36) comprises two lifting heads (361) located at the bottom of the sealing platform (333), and the lifting heads (361) are driven to move up and down by a lifting cylinder (362) at the bottom. A belt conveyor (363) is provided on one side of the discharge port (6) in the inner box (32), and the top of the belt conveyor (363) is flush with the top of the sealing platform (333) after the discharge port (6) in the inner box (32). The inclined surface is formed, and the upwardly moving lifting head (361) pushes the sealed fresh-keeping box embedded in the sealing platform (333) to move upward, and then the pushing plate (353) pushes the unsealed fresh-keeping box to move toward the sealing platform (333). At the same time, the unsealed fresh-keeping box pushes the sealed fresh-keeping box to the top of the belt conveyor (363), and finally the belt conveyor (363) conveys the sealed fresh-keeping box to the discharge port (6) so that it moves down along the inclined surface in the discharge port (6) and out.

6. The atmosphere-controlled sterilizing machine for longan storage according to claim 1, characterized in that: The opening blocking mechanism (37) comprises two blocking plates a (371) that block the top opening of the inner box (32); the two blocking plates a (371) are arranged in a mirror image; an iron plate (372) is fixed to the ends of the two blocking plates a (371) that are away from each other; an electromagnet (377) is embedded at the top of the inner box (32) where it contacts (317); the electromagnet (377) adsorbs the iron plate (372) to fix the position of the blocking plate a (371) when energized; a plurality of springs a (373) in a stretched state are fixed to the side of the iron plate (372) away from the blocking plate a (371); the springs a (373) pull the blocking plate a (371) out of the top opening of the inner box (32) when the electromagnet (377) is powered off; The feed port blocking mechanism (38) comprises a blocking plate b (381) inserted into the inner box (32), and the blocking plate b (381) is driven to move up and down by a hydraulic cylinder b (382) at the bottom; The discharge port blocking mechanism (39) comprises a blocking plate c (391) inserted into the inner box (32), a triangular bracket (392) being fixed at the bottom of the blocking plate c (391), and a hydraulic cylinder c (393) for driving the blocking plate c (391) to move up and down being fixed at the bottom of the triangular bracket (392).

7. The controlled atmosphere sterilizing machine for longan storage according to claim 6, characterized in that: An arc-shaped groove is provided on one side of the two blocking plates a (371) that are close to each other, and an arc-shaped sealing ring (374) is fixed in the arc-shaped groove. The sealing ring (374) is tightly fitted with the outside of the mobile end extending from the hydraulic cylinder a (341). Two short plates (375) are inserted into one of the blocking plates a (371). A plurality of springs b (376) are fixed at one end of the short plate (375). When the mobile end of the hydraulic cylinder a (341) retracts, the springs b (376) push the short plate (375) to block the arc-shaped groove between the two blocking plates a (371); The opening sealing mechanism (37), the sealing plate b (381) and the sealing plate c (391) are all wrapped with sealing strips to seal the gaps between the opening sealing mechanism (37), the feed port sealing mechanism (38), the discharge port sealing mechanism (39) and the inner box (32).

8. The controlled atmosphere sterilizing machine for longan storage according to claim 1, characterized in that: A feeding conveyor (5) is provided on the front side of the outer box (31), and the feeding conveyor (5) is located below the feeding port (4); A discharge conveyor (7) is provided on one side of the outer box (31), and the discharge conveyor (7) is located below the discharge port (6). The width of the discharge conveyor (7) is twice the width of the feed conveyor (5).

9. The controlled atmosphere sterilizing machine for longan storage according to claim 8, characterized in that: The sterilization box (2) comprises a sealed box (21), a sealed door (22) being installed on one of the outer walls of the sealed box (21), and transparent observation windows (23) being installed on the remaining outer walls of the sealed door (22); The front side of the sealed box (21) and the rear side of the outer box (31) are both equipped with pressure gauges (8); the pressure gauge (8) installed on the sealed box (21) is used to monitor the air pressure inside the sealed box (21); and the pressure gauge (8) installed on the rear side of the outer box (31) is used to monitor the air pressure inside the inner box (32); A strobe alarm light (9) for alarming is provided on one side of the top of the sealing box (21), and a control box (10) for receiving monitoring data of a pressure gauge (8) is provided on the front side of the sealing box (21). The strobe alarm light (9), the feeding conveyor (5) and the discharging conveyor (7) are all controlled by the control box (10).

10. A method for sterilizing longan using the controlled atmosphere sterilizer according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the sealing plate b (381) is controlled by the hydraulic cylinder b (382) to move downward, and the feed opening (4) in the inner box (32) is opened. Then, the staff sequentially places the fresh-keeping boxes containing longan on the top of the feed conveyor (5), and the feed conveyor (5) conveys the fresh-keeping boxes, so that the fresh-keeping boxes pass through the feed opening (4) and move into the inner box (32); S2, when a fresh-keeping box moves to one side of the top of the loading platform (351), the baffle (352) rises, and then another fresh-keeping box moves to the side of the baffle (352), at which time the blocking plate b (381) moves up to block the feed opening (4), and then the push plate (353) is driven by the rotating threaded rod b (355) to move on the top of the loading platform (351), and at the same time, the two fresh-keeping boxes on one side are pushed to two workstations on the sealing platform (333) respectively; S3, the control box (10) controls the vacuum pump (11) to start, and the air inside the inner box (32) is extracted, so that the inside of the inner box (32) is in a vacuum environment; S4, the control box (10) controls the two electromagnets (377) to be de-energized, so that the sealing plate a (371) is moved out of the top opening of the inner box (32) under the pulling of the spring a (373), and then the sealing table lifting assembly (34) drives the sealing table (333) to move upward, through the top opening of the inner box (32) and into the inner box (32), and then the electromagnet (377) is powered on again, and the adsorption iron plate (372) drives the sealing plate a (371) to be re-inserted into the top opening position of the inner box (32), thereby sealing the top opening of the inner box (32); S5, the gas treated by plasma is filled into the sterilization box (2) through the air inlet pipe (1), a sterilization environment is created in the sterilization box (2), and then the sealing plate (332) is started to seal the fresh-keeping box containing the longan, and the plasma gas is encapsulated in the fresh-keeping box; S6, the control box (10) controls the two electromagnets (377) to be powered off again, so that the blocking plate a (371) is moved out of the top opening of the inner box (32) under the pulling of the spring a (373), and then the sealing table lifting assembly (34) drives the sealing table (333) to move the sealed fresh-keeping box downward until it moves into the inner box (32), and then the electromagnet (377) is powered on again, and the adsorption iron plate (372) drives the blocking plate a (371) to be re-inserted into the top opening position of the inner box (32), so that the top opening of the inner box (32) is re-blocked; S7, the lifting cylinder (362) drives the lifting head (361) to move upward, pushing the two sealed fresh-keeping boxes embedded in the sealing platform (333) to move upward, and then repeating S1, conveying the two new fresh-keeping boxes before being sealed to the top of the loading platform (351), and pushing them toward the sealing platform (333) by the pushing plate (353), so that the fresh-keeping boxes before being sealed can push the sealed fresh-keeping boxes to move to the top of the belt conveyor (363), and the belt conveyor (363) moves the sealed fresh-keeping boxes to the discharge port (6), so that they move down along the inclined surface at the bottom of the discharge port (6) to the top of the discharge conveyor (7) for discharge.

Images