CN114431289A - System and method for prolonging storage period of litchi fruits through heat treatment - Google Patents

Abstract

The invention relates to a system and a method for prolonging the storage period of litchi by heat treatment, which relate to the technical field of litchi treatment.A sodium nitroprusside solution is stored in a water storage tank, when a litchi discharge frame carrying litchi comes out of an immersion tank and rotates to the position below a blocking block, the litchi discharge frame is in contact with the blocking block, the litchi discharge frame starts to turn over under the blocking of the blocking block, the litchi at the moment is completely poured onto a conveying frame, the litchi rolls leftwards along the conveying frame, and when the litchi discharge frame passes through a spray pipe, the water pump sprays the sodium nitroprusside solution through the spray pipe, compared with the common litchi, the litchi sprayed with the sodium nitroprusside solution has bright color, the aging phenomenon is delayed, and the fresh-keeping time is prolonged; when the litchi chinensis passes through the heater, the fan blows hot air generated by the heater to the litchi chinensis, and the litchi chinensis is subjected to heating treatment, wherein the set temperature of the heater is 150 ℃; the heated litchi has bright red color and luster and glittering and translucent flesh, and the shell and the flesh are completely separated during shelling without adhesion.

Description

A system and method for extending litchi storage period by heat treatment

technical field

The invention relates to the technical field of litchi processing, in particular to a system and a process for extending the storage period of litchi through heat treatment.

Background technique

Litchi (Litchi chinensis Sonn) is most abundantly grown in Guangdong and southern Fujian. At the same time, lychee is one of the world-famous Chinese specialties. It is a subtropical fruit with bright color, unique flavor and rich nutrition. It is the best fruit in Lingnan. However, lychees are one of the most difficult fruits to keep fresh. Browning, qualitative change and decay occur soon after picking, and the physiological and metabolic activities of lychees after harvesting are very vigorous, and the most important physiological activity is respiration, which consumes a lot of Water, soluble sugars and organic acids cause the loss of fruit moisture and nutrients, resulting in browning and senescence of lychee fruit. The freshness of lychees rapidly declines due to the "one-day discoloration, two-day fragrant change, and three-day taste change", and its appeal to consumers and its edible value also decline. Therefore, it has become necessary to apply appropriate fresh-keeping technology to the post-harvest lychee fruit. Extending its fresh-keeping period and maintaining its good quality can not only reduce economic losses, but also be more conducive to the further promotion of lychee.

Heat treatment is one of the ways to keep lychees fresh. Heat treatment can greatly reduce the PPO residue in the peel and improve the fresh-keeping effect of lychees. However, after the traditional lychees are picked, whether they are cleaning, soaking or heating, multiple processes or multiple equipment are required. The combined use of lychees can achieve the effect of lychee treatment, but the long-term upside down not only has high labor intensity and low work efficiency, but also lychees are prone to bumps, resulting in shorter storage time for some lychees.

SUMMARY OF THE INVENTION

technical problem to be solved

The object of the present invention is to overcome the deficiencies of the prior art, adapt to practical needs, and provide a system and process for extending the storage period of litchi through heat treatment to solve the above-mentioned technical problems.

Technical solutions

In order to realize the purpose of the present invention, the technical scheme adopted in the present invention is:

A system for extending the storage period of lychees by heat treatment, comprising a lychee storage box, a lychee arrangement conveying mechanism is arranged below the one end, and the lychee arrangement conveying mechanism is fixedly installed on the upper end of the soaking box; the inside of the soaking box is A lychee soaking conveying mechanism is provided, and one side of the lychee soaking conveying mechanism is provided with a conveying frame; the two sides of the conveying frame are fixedly installed with a frame body;

An outer casing is arranged between the two frame bodies; a spray pipe is arranged inside the outer casing, the bottom of the spray pipe is installed on the conveying frame through a pillar, and the spray pipe is connected to the accumulator through the conveying pipe. The water tank is connected; the conveying pipe runs through the interior of the water storage tank and is connected with a water pump; the water storage tank is hung on the bottom of the conveying frame, and the conveying frame between the water storage tank and the spray pipe is opened There are several through holes;

One side of the outer casing is provided with a mounting rack, and two mounting racks are provided, and the two mounting racks are symmetrically mounted on both sides of the conveying rack; the inner sides of the two mounting racks are both provided There are a plurality of fans, and a heater is arranged on the inner side of the fans; a top cover is fixedly installed on the top of the two mounting frames;

A plurality of nozzles are arranged at one end of the conveying frame away from the lychee soaking conveying mechanism; the nozzles are connected with the steam generator through a steam pipe.

As a further technical solution of the present invention, one end of the conveying frame close to the lychee soaking conveying mechanism is set to be inclined, and the inclined angle thereof is between 35-45 degrees.

As a further technical solution of the present invention, the lychee arrangement conveying mechanism includes a conical bucket, which is fixed on the top of a cylindrical shell; a distribution plate is arranged inside the cylindrical shell; the cylindrical shell is A drive motor is arranged in the middle position of the bottom of the casing, and the output shaft of the drive motor penetrates into the interior of the cylindrical casing and is connected with the distribution plate.

As a further technical solution of the present invention, a plurality of U-shaped grooves are provided around the distribution plate for convenient storage of lychees; a U-shaped through groove is formed at the edge of the bottom of the cylindrical shell, and the bottom of the U-shaped through groove is provided with a U-shaped through groove. There is a lychee conveying pipe; one end of the lychee conveying pipe extends to one side of the lychee soaking conveying mechanism.

As a further technical solution of the present invention, one end of the lychee storage box is fixed on the conical bucket, and the inner cavity of the lychee storage box is communicated with the inner cavity of the conical bucket, and the other end of the lychee storage box is installed on the On the soaking box; the lychee storage box is set to be inclined, and is inclined from one end of the bracket to one end of the conical bucket, and the inclination angle is 30 degrees.

As a further technical solution of the present invention, the lychee soaking and conveying mechanism includes two runners, and the two runners are fixedly installed on both ends of the transmission shaft; the two ends of the transmission shaft rotate through the bearings and the soaking box connected, and one end of the transmission shaft penetrates to the outside of the soaking box, and is matched with a rotating motor;

A plurality of lychee discharge racks are arranged between the two described runners; both ends of the lychee discharge rack are movably connected with the runner through a rotating shaft; the bottom of the lychee discharge rack is provided with a plurality of counterweights; The inner side of the litchi discharge rack is also provided with a sponge strip; one end of the litchi discharge rack close to the lychee conveying pipe is 10-15 degrees higher than the other end.

As a further technical solution of the present invention, a blocking block is provided in the middle of one end of the conveying rack close to the lychee soaking conveying mechanism; the blocking block is within the rotation range of the lychee discharge rack.

As a further technical solution of the present invention, there are a plurality of the nozzles, each of the three nozzles is a group, and the nozzles in each group are arranged and installed in a triangular manner.

(3) Beneficial effects:

A, in the present invention, pour the litchi after cleaning into the lychee storage box, because the lychee storage box is set in an inclined manner, the lychee will roll into the conical bucket, and some lychees will fall on the distribution plate In the U-shaped groove, the drive motor drives the distribution plate to rotate. When the U-shaped groove on the distribution plate is aligned with the U-shaped through groove at the bottom of the cylindrical shell, there will be lychees falling to the lychees through the lychee conveying pipe. In the discharge rack, then the lychees in the conical bucket continue to enter the U-shaped groove for replenishment;

B, in the present invention, because the lychee discharge rack is an inclined setting, the lychees can be automatically rolled and arranged in the lychee discharge rack, when the lychee in a litchi discharge rack is full, the lychee arrangement conveying mechanism stops the lychee supply, this The rotating motor drives the runner to rotate clockwise through the transmission shaft until the next lychee arrangement conveying mechanism is flush with the lychee conveying pipe;

C, in the present invention, the inner side of the lychee discharge rack is also provided with a sponge strip, when the lychee falls into the lychee discharge rack, buffering can be carried out by the sponge strip, to avoid the occurrence of the situation that the impact force is larger and cause the lychee to be damaged;

D, in the present invention, the sodium nitroprusside solution is stored in the water storage tank, when the litchi discharge rack carrying litchi comes out from the soaking box, when the litchi discharge rack rotates to the bottom of the blocking block, contacts with the blocking block , Under the blocking of the blocking block, the lychee discharge rack begins to turn over. At this time, the lychee is completely poured into the conveyor rack, and the lychee rolls to the left along the conveyor rack. When passing through the spray pipe, the water pump will spray the sodium nitroprusside solution through the spray Compared with ordinary lychees, the lychees after spraying with the sodium nitroprusside solution have bright colors, delay the aging phenomenon, and increase the preservation time;

E, in the present invention, because the more to the left of the conveying frame, the smaller the width, and the more gentle, the rolling speed of the lychee is reduced, and when passing through the heater, the fan blows the hot air generated by the heater to the lychee to heat the lychee, At this time, the set temperature of the heater is 150°C; the heated lychee has a bright red color, and the pulp is crystal clear. When the shell is peeled, the shell and the pulp are completely separated, and there is no adhesion phenomenon;

F, in the present invention, the steam generated by the steam generator is transported into the nozzle by the steam pipe, and sprays the lychee, so as to moisten the lychee, so that the epidermal humidity of the lychee is 70-75%;

G. In the present invention, a plurality of nozzles are provided, each of three nozzles is a group, and each group of nozzles is arranged in a triangular arrangement, so that the lychee can be sprayed with wrapped steam, which not only makes the lychee heated evenly, but also makes the Lychees are better moisturised.

Description of drawings

Fig. 1 is the structural representation of the system of the present invention extending the storage period of litchi through heat treatment;

Fig. 2 is the right side view of the system Fig. 1 that prolongs the storage period of litchi through heat treatment of the present invention;

Fig. 3 is the end view of the system Fig. 1 that prolongs the storage period of litchi through heat treatment of the present invention;

Fig. 4 is the A-A sectional view of Fig. 3 in the system of extending litchi storage period through heat treatment of the present invention;

Fig. 5 is the partial structure schematic diagram of Fig. 1 in the system of extending litchi storage period by heat treatment of the present invention;

Fig. 6 is the top view of Fig. 5 in the system of extending litchi storage period through heat treatment of the present invention;

Fig. 7 is the enlarged schematic diagram at B of Fig. 4 in the system for extending the storage period of litchi through heat treatment of the present invention;

Fig. 8 is the structural representation of the lychee immersion conveying mechanism of the system of extending litchi storage period by heat treatment of the present invention;

FIG. 9 is a half cross-sectional view of the litchi arrayed conveying mechanism of the system for extending the litchi storage period by heat treatment of the present invention.

The reference numbers are as follows:

1. Litchi storage box; 2. Litchi arrangement conveying mechanism; 3. Litchi soaking conveying mechanism; 4. Soaking box; 5. Rotary motor; 6. Conveyor frame; 7. Outer shell; 8. Spray pipe; 9. Pillar; 10, delivery pipe; 11, water storage tank; 12, mounting frame; 13, fan; 14, heater; 15, nozzle; 16, steam pipe; 17, steam generator; 18, top cover; 19, machine Frame body; 21. Conical bucket; 22. Cylindrical shell; 23. Distribution plate; 24. Driving motor; 25. Motor shell; 26. Litchi conveying pipe; frame; 34, counterweight; 35, sponge strip; 61, blocking block.

Detailed ways

Below in conjunction with accompanying drawing 1-9 and embodiment, the present invention is further described:

A system for extending the storage period of litchi through heat treatment, comprising a lychee storage box 1, a lychee arrangement type conveying mechanism 2 is arranged below the one end, and the lychee arrangement type conveying mechanism 2 is fixedly installed on the upper end of the soaking box 4; the described The inside of the soaking box 4 is provided with a lychee soaking conveying mechanism 3, and one side of the lychee soaking conveying mechanism 3 is provided with a conveying frame 6; the two sides of the conveying frame 6 are fixedly installed with a frame body 19;

An outer casing 7 is arranged between the two frame bodies 19; a spray pipe 8 is arranged inside the outer casing 7, and the bottom of the spray pipe 8 is installed on the conveying frame 6 through the pillar 9, and the spray pipe 8 is sprayed. The shower pipe 8 is connected with the water storage tank 11 through the conveying pipe 10; the conveying pipe 10 penetrates into the interior of the water storage tank 11 and is connected with a water pump; the water storage tank 11 is hung on the bottom of the conveying frame 6, and A number of through holes are opened on the conveying frame 6 between the water storage tank 11 and the spray pipe 8

One side of the outer casing 7 is provided with a mounting frame 12, and two mounting frames 12 are provided. The two mounting frames 12 are symmetrically installed on both sides of the conveying frame 6; The inner side of the rack 12 is provided with a plurality of fans 13, and a heater 14 is provided on the inner side of the fan 13; the top of the two mounting racks 12 is fixedly mounted with a top cover 18;

A plurality of nozzles 15 are provided at one end of the conveying frame 6 away from the lychee soaking conveying mechanism 3 ; the nozzles 15 are connected to the steam generator 17 through the steam pipe 16 .

In this embodiment, the end of the conveying frame 6 close to the lychee soaking conveying mechanism 3 is set in an inclined shape, and the inclination angle thereof is between 35-45 degrees.

In this embodiment, the lychee arrangement conveying mechanism 2 includes a conical bucket 21, the conical bucket 21 is fixed on the top of the cylindrical casing 22, and the lower part of the cylindrical casing 22 is connected to the motor casing 25; the cylindrical casing 22 is connected to the motor casing 25; A distribution plate 23 is arranged inside the casing 22; a drive motor 24 is arranged at the bottom middle position of the cylindrical casing 22, and the output shaft of the drive motor 24 penetrates into the interior of the cylindrical casing 22 and is connected with the distribution plate 23 to drive the motor. 24 is provided in the motor housing 25 .

In the present embodiment, a plurality of U-shaped grooves are provided around the distribution plate 23 to facilitate the storage of lychees; the bottom edge of the cylindrical shell 22 is provided with a U-shaped through groove, and the bottom of the U-shaped through groove is provided with a U-shaped through groove. Litchi conveying pipe 26; one end of the lychee conveying pipe 26 extends to one side of the lychee soaking conveying mechanism 3.

In this embodiment, one end of the lychee storage box 1 is fixed on the conical bucket 21, and the inner cavity of the lychee storage box 1 is communicated with the inner cavity of the conical bucket 21, and the other end of the lychee storage box 1 passes through the bracket It is installed on the soaking box 4; the lychee storage box 1 is set as an inclined type, which is inclined from one end of the bracket to one end of the conical bucket 21, and its inclination angle is 30 degrees.

In this embodiment, the lychee soaking and conveying mechanism 3 includes two runners 31, and the two runners 31 are fixedly installed on both ends of the transmission shaft 32; The box 4 is rotatably connected, and one end of the transmission shaft 32 penetrates to the outside of the soaking box 4, and is matched with a rotating motor 5.

A plurality of litchi discharge racks 33 are arranged between the two described runners 31; both ends of the litchi discharge rack 33 are movably connected with the runner 31 through a rotating shaft; the bottom of the described litchi discharge rack 33 is provided with a plurality of The counterweight 34; the inner side of the lychee discharge rack 33 is also provided with a sponge strip 35; the end of the lychee discharge rack 33 close to the lychee conveying pipe 26 is 10-15 degrees higher than the other end.

In this embodiment, a blocking block 61 is provided in the middle of one end of the conveying rack 6 close to the lychee soaking conveying mechanism 3 ; the blocking block 61 is within the rotation range of the lychee discharging rack 33 .

In this embodiment, there are a plurality of the nozzles 15 , each of the three nozzles 15 is a group, and the nozzles 15 in each group are arranged in a triangular arrangement.

A method for prolonging the storage period of litchi through heat treatment, comprising the following steps:

The first step of cleaning the lychees is to remove the newly picked lychees, and cut off the root twigs that were carried when the lychees were picked, but be careful not to damage the lychee skin, then wash the lychees to remove the dust and other stolen goods;

In the second step, the lychees are transported in a row and soaked, and the cleaned lychees are poured into the lychee storage box 1. Because the lychee storage box 1 is set in an inclined manner, the lychees will roll into the conical bucket 21, and some The lychee will fall into the U-shaped groove on the distribution plate 23. At this time, the drive motor 24 drives the distribution plate 23 to rotate. When the U-shaped groove on the distribution plate 23 is aligned with the U-shaped through groove at the bottom of the cylindrical housing 22 , there will be lychees dropped into the lychee discharge rack 33 through the lychee conveying pipe 26, and then the lychees in the conical bucket 21 continue to enter the U-shaped groove for replenishment;

Because the lychee discharge rack 33 is set in an inclined manner, the lychees are automatically rolled and arranged in the lychee discharge rack 33. When the lychee in a lychee discharge rack 33 is full, the lychee arrangement conveying mechanism 2 stops the lychee supply, and rotates at this time. The motor 5 drives the runner 31 to rotate clockwise through the transmission shaft 32, until the next lychee arrangement conveying mechanism 2 is flush with the lychee conveying pipe 26; the rotating motor 5 in this technical scheme starts and stops and the lychee arrangement conveying mechanism 2 rotates Whether it is in place is controlled by the camera and controller is not disclosed

The soaking box 4 is filled with a diluent containing 45% prochloraz water emulsion, and the dilution is 1500-2000 times. When the lychee arrangement conveying mechanism 2 loaded with lychees is immersed in the soaking box 4 for soaking, by inhibiting the sterols in the bacteria It has excellent biosynthesis, so that the bacteria cannot grow; it has excellent control effect on various diseases caused by ascomycetes and deuteromycetes, especially for anthracnose. The soaking time of the arranged conveying mechanism 2 in the soaking box 4 is 3-5 minutes;

The transmission spraying of the 3rd step litchi, at first the sodium nitroprusside solution is stored in the water storage tank 11, when the litchi discharge rack 33 carrying the litchi comes out from the soaking tank 4, the litchi discharge rack 33 rotates to the stopper 61. When it is below, it comes into contact with the blocking block 61. Under the blocking of the blocking block 61, the lychee discharge rack 33 begins to turn over. The litchi at this time is completely poured into the conveyor rack 6, and the lychee rolls to the left along the conveyor rack 6. When the spray pipe 8 is used, the water pump sprays the sodium nitroprusside solution through the spray pipe 8, and the lychee after spraying the sodium nitroprusside solution is brighter in color than ordinary lychees, delays the aging phenomenon, and increases the preservation time;

The fourth step of heating the lychee, because the more the conveyor 6 goes to the left, the smaller the width, and the more gentle, the rolling speed of the lychee is reduced. The lychee is heated, and the heater 14 is set to a temperature of 150°C at this time; the heated lychee has a bright red color, and the pulp is crystal clear. When peeling the shell, the husk and the pulp are completely separated, and there is no adhesion phenomenon;

The spray of the 5th step lychee, because the dried lychee epidermis moisture is lower, the situation that the husk absorbs the pulp moisture will occur at this time, for this reason, the steam generator 17 is provided, and the set temperature of the steam generator 17 is set at At 80-85°C, the steam generated by the steam generator 17 is transported into the nozzle 15 through the steam pipe 16, and sprays the lychee, thereby moisturizing the lychee, so that the epidermal humidity of the lychee is 70-75%.

working principle:

In the present invention, the cleaned litchis are poured into the litchi storage box 1, because the litchi storage box 1 is set in an inclined manner, the lychees will roll down into the conical bucket 21, and some lychees will fall to the distribution tray In the U-shaped groove on 23, the drive motor 24 drives the distribution plate 23 to rotate at this time. When the U-shaped groove on the distribution plate 23 is aligned with the U-shaped through groove at the bottom of the cylindrical shell 22, there will be lychees passing through the lychees. The conveying pipe 26 is dropped into the litchi discharge rack 33, and then the litchi in the conical bucket 21 continuously enters into the U-shaped groove for replenishment;

Because the lychee discharge rack 33 is set in an inclined manner, the lychees are automatically rolled and arranged in the lychee discharge rack 33. When the lychee in a lychee discharge rack 33 is full, the lychee arrangement conveying mechanism 2 stops the lychee supply, and rotates at this time. The motor 5 drives the runner 31 to rotate clockwise through the transmission shaft 32, until the next lychee arrangement conveying mechanism 2 is flush with the lychee conveying pipe 26;

The soaking box 4 is filled with a diluent containing 45% prochloraz water emulsion, and the dilution is 1500-2000 times. When the lychee arrangement conveying mechanism 2 loaded with lychees is immersed in the soaking box 4 for soaking, by inhibiting the sterols in the bacteria It has excellent biosynthesis, so that the bacteria cannot grow; it has excellent control effect on various diseases caused by ascomycetes and deuteromycetes, especially for anthracnose. The soaking time of the arranged conveying mechanism 2 in the soaking box 4 is 3-5 minutes;

When the litchi discharge rack 33 loaded with litchi comes out of the soaking box 4, when the litchi discharge rack 33 rotates to the bottom of the blocking block 61, it contacts with the blocking block 61, and under the blocking of the blocking block 61, the lychee discharging rack 33 starts Turn over, the lychees at this time are completely poured into the conveying frame 6, the lychees roll to the left along the conveying frame 6, and when passing through the spray pipe 8, the water pump sprays the sodium nitroprusside solution through the spray pipe 8, and sprays Compared with ordinary lychees, the lychees after dipping in sodium nitroprusside solution have bright color, delay the aging phenomenon, and increase the preservation time;

As the conveying frame 6 goes to the left, the width is smaller and more gentle, and the rolling speed of the lychee decreases. When passing through the heater 14, the fan 13 blows the hot air generated by the heater 14 towards the lychee, and heats the lychee. The set temperature of the heater 14 is 150°C; the heated lychee has a bright red color and a crystal flesh, and the husk and the flesh are completely separated when peeling, and there is no sticking phenomenon;

Because the moisture content of the dried lychee skin is low, the nut shell will absorb the moisture of the pulp. Therefore, a steam generator 17 is set up, and the set temperature of the steam generator 17 is set at 80-85°C. The steam generated by 17 is transported into the nozzle 15 through the steam pipe 16, and sprays the lychee, thereby moisturizing the lychee, so that the epidermal humidity of the lychee is 70-75%.

Claims (9)

1. The system for prolonging the storage period of the litchi fruits through heat treatment is characterized by comprising a litchi fruit storage box (1), wherein a litchi fruit arrangement type conveying mechanism (2) is arranged below one end of the litchi fruit storage box, and the litchi fruit arrangement type conveying mechanism (2) is fixedly arranged at the upper end of an immersion box (4); a litchi soaking and conveying mechanism (3) is arranged in the soaking box (4), and a conveying frame (6) is arranged on one side of the litchi soaking and conveying mechanism (3); a frame body (19) is fixedly arranged on two sides of the conveying frame (6);

an outer shell (7) is arranged between the two frame bodies (19); a spray pipe (8) is arranged in the outer shell (7), the bottom of the spray pipe (8) is arranged on the conveying frame (6) through a support (9), and the spray pipe (8) is connected with the water storage tank (11) through a conveying pipe (10); the conveying pipe (10) penetrates into the water storage tank (11) and is connected with a water pump; the water storage tank (11) is hung at the bottom of the conveying frame (6), and a plurality of through holes are formed in the conveying frame (6) between the water storage tank (11) and the spray pipe (8);

one side of the outer shell (7) is provided with two mounting frames (12), and the two mounting frames (12) are symmetrically mounted on the two sides of the conveying frame (6); a plurality of fans (13) are arranged on the inner sides of the two mounting frames (12), and heaters (14) are arranged on the inner sides of the fans (13); top covers (18) are fixedly arranged at the tops of the two mounting frames (12);

a plurality of nozzles (15) are arranged at one end of the conveying frame (6) far away from the litchi soaking and conveying mechanism (3); the nozzle (15) is connected with a steam generator (17) through a steam pipe (16).

2. The heat treated litchi storage life extension system of claim 1, wherein: one end of the conveying frame (6) close to the litchi soaking and conveying mechanism (3) is inclined, and the inclination angle is 35-45 degrees.

3. The heat treated litchi storage life extension system of claim 2, wherein: the litchi alignment type conveying mechanism (2) comprises a conical hopper (21), and the conical hopper (21) is fixed at the top of a cylindrical shell (22); a distribution disc (23) is arranged in the cylindrical shell (22); a driving motor (24) is arranged in the middle of the bottom of the cylindrical shell (22), and an output shaft of the driving motor (24) penetrates into the cylindrical shell (22) and is connected with the distribution disc (23).

4. The heat treated litchi storage life extension system of claim 3, wherein: a plurality of U-shaped grooves convenient for storing litchis are formed around the distribution disc (23); a U-shaped through groove is formed in the edge position of the bottom of the cylindrical shell (22), and a litchi conveying pipe (26) is arranged at the bottom of the U-shaped through groove; one end of the litchi conveying pipe (26) extends to one side of the litchi soaking and conveying mechanism (3).

5. The heat treated litchi storage life extension system of claim 4, wherein: one end of the litchi storage box (1) is fixed on the conical hopper (21), the inner cavity of the litchi storage box (1) is communicated with the inner cavity of the conical hopper (21), and the other end of the litchi storage box (1) is arranged on the soaking box (4) through a support; the litchi storage box (1) is inclined, and the litchi storage box is inclined from one end of the support to one end of the conical hopper (21), and the inclination angle is 30 degrees.

6. The heat treated litchi storage life extension system of claim 1, wherein: the litchi soaking and conveying mechanism (3) comprises two rotating wheels (31), and the two rotating wheels (31) are fixedly arranged at two ends of a transmission shaft (32); two ends of the transmission shaft (32) are rotatably connected with the soaking box (4) through bearings, one end of the transmission shaft (32) penetrates through the outside of the soaking box (4), and is connected with a rotating motor (5) in a matching way;

a plurality of litchi discharging racks (33) are arranged between the two rotating wheels (31); two ends of the litchi discharging frame (33) are movably connected with the rotating wheel (31) through rotating shafts; a plurality of balancing weights (34) are arranged at the bottom of the litchi discharging frame (33); the inner side of the litchi discharging frame (33) is also provided with a sponge strip (35); one end of the litchi discharging frame (33) close to the litchi conveying pipe (26) is 10-15 degrees higher than the other end.

7. The heat treated litchi storage life extending system of claim 6, wherein: a blocking block (61) is arranged at the middle position of one end of the conveying frame (6) close to the litchi soaking and conveying mechanism (3); the blocking block (61) is positioned in the rotation range of the litchi discharging frame (33).

8. The heat treated litchi storage life extension system of claim 1, wherein: the nozzle (15) is provided with a plurality of nozzles, every three nozzles (15) form a group, and each group of nozzles (15) are arranged in a triangular mode.

9. A method for prolonging the storage life of litchi by heat treatment is characterized in that: the method comprises the following steps:

firstly, cleaning litchi, namely firstly, carrying out branch removing treatment on newly picked litchi, cutting off roots and branches carried in the litchi picking process, but needing to pay attention to not damage litchi rind, and then cleaning the litchi to remove dust and other dirt on the litchi;

secondly, carrying out sequential litchi conveying and soaking treatment, pouring cleaned litchi into a litchi storage box (1), wherein the litchi is arranged in an inclined mode, the litchi can roll into a conical hopper (21), and some litchi can fall into a U-shaped groove on a distribution disc (23), at the moment, a driving motor (24) drives the distribution disc (23) to rotate, when the U-shaped groove on the distribution disc (23) is aligned with a U-shaped through groove at the bottom of a cylindrical shell (22), the litchi can fall into a litchi discharge rack (33) through a litchi conveying pipe (26), and then the litchi in the conical hopper (21) continuously enters the U-shaped groove for supplement;

because the litchi discharging frames (33) are arranged in an inclined mode, the litchis can automatically roll and be arranged in the litchi discharging frames (33), after the litchis in one litchi discharging frame (33) are filled, the litchi supply is stopped by the litchi arraying type conveying mechanism (2), and at the moment, the rotating motor (5) drives the rotating wheel (31) to rotate clockwise through the transmission shaft (32) until the next litchi arraying type conveying mechanism (2) is flush with the litchi conveying pipe (26);

the soaking box (4) is filled with diluent containing 45% prochloraz aqueous emulsion, the dilution is 1500-2000 times, when the litchi arrayed conveying mechanism (2) carrying litchi is soaked in the soaking box (4) for soaking, the bacteria can not grow by inhibiting the biosynthesis of sterol in the bacteria; the litchi chinensis ordered delivery mechanism has excellent control effect on various diseases caused by ascomycetes and imperfect fungi, particularly has better effect on anthracnose, controls the rotating speed of the rotating motor (5), and ensures that the litchi chinensis ordered delivery mechanism (2) carrying litchi is soaked in the soaking box (4) for 3-5 minutes;

thirdly, litchi is transported and sprayed, firstly, sodium nitroprusside solution is stored in a water storage tank (11), when a litchi discharge rack (33) loaded with litchi comes out of a soaking tank (4), the litchi discharge rack (33) rotates to the position below a blocking block (61), the litchi discharge rack is contacted with the blocking block (61), the litchi discharge rack (33) starts to turn over under the blocking of the blocking block (61), the litchi is completely poured onto a conveying rack (6), the litchi rolls to the left side along the conveying rack (6), when passing through a spraying pipe (8), the sodium nitroprusside solution is sprayed by a water pump through the spraying pipe (8), and the litchi sprayed with the sodium nitroprusside solution is bright in color and luster, delays the aging phenomenon and prolongs the preservation time compared with the common litchi;

fourthly, heating the litchis, wherein the width of the transport frame (6) is smaller and more gentle as the transport frame is more leftward, the rolling speed of the litchis is reduced, when the litchis pass through the heater (14), the fan (13) blows hot air generated by the heater (14) to the litchis to heat the litchis, and the temperature of the heater (14) is set to be 150 ℃; the heated litchi is bright red in color and luster and glittering and translucent in flesh, and shells and flesh are completely separated during shelling without adhesion;

and in the fifth step of litchi spraying, because the moisture content of the skin of the dried litchi is low, the situation that the fruit shell absorbs the pulp moisture can occur, a steam generator (17) is arranged for the purpose, the set temperature of the steam generator (17) is set to be 80-85 ℃, steam generated by the steam generator (17) is conveyed into a nozzle (15) through a steam pipe (16) and is sprayed on the litchi to moisten the litchi, and the skin humidity of the litchi is enabled to be 70-75%.

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