Agricultural fruit and vegetable fresh-keeping equipment

Abstract

The invention discloses agricultural fruit and vegetable fresh-keeping equipment, and relates to the technical field of agricultural cultivation fresh-keeping, the agricultural fruit and vegetable fresh-keeping equipment comprises a fresh-keeping tank, the top end of the fresh-keeping tank is provided with a humidifier and a dehumidifier, the upper side of the outer surface of the fresh-keeping tank is provided with a feed hopper, and the lower side of the outer surface of the fresh-keeping tank is provided with an opening and closing plate. According to the agricultural fruit and vegetable fresh-keeping equipment, fruits and vegetables can move downwards along a spiral track through the spiral guide groove, the temperature of the fruits and the vegetables is rapidly reduced by utilizing a vacuum evaporation heat absorption principle in a vacuum environment, and ozone generated by an ozone generation pipe circulates in a spiral channel along with airflow; the fruits and the vegetables are comprehensively cooled and sterilized through rotation of a spiral guide groove when the fruits and the vegetables roll, the dual effects of pre-cooling and sterilization are achieved, and a worker can flexibly adjust the opening and closing angle of a switch plate according to actual requirements through a positioning moving pull rod and a lifting sliding groove; the angle of the switch plate can be positioned in time through the positioning pull rod when the hand is loosened, excessive fruits and vegetables are prevented from rolling and overflowing, and locking is achieved when the fruits and the vegetables are stopped.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural cultivation and preservation, and specifically relates to an agricultural fruit and vegetable preservation device. Background Art

[0002] The reasons why agricultural fruits and vegetables need to be preserved are mainly closely related to the physiological characteristics of the fruits and vegetables themselves, the influence of the external environment, and the requirements of the industrial chain. After being picked, fruits and vegetables still carry out respiration, consuming their own nutrients such as sugars and vitamins, producing carbon dioxide and water, resulting in the fruits gradually becoming soft and the taste deteriorating. Moreover, the water content in fruits and vegetables usually reaches 70% - 95%. If there is a lack of moisture preservation measures after picking, the water will evaporate through the epidermal stomata, causing the fruits to wilt, lose weight, and the appearance and taste to deteriorate. Microorganisms attached to the surface of fruits and vegetables will multiply under suitable temperature and humidity conditions, decomposing the organic substances in the fruits and causing mildew and rot. For example, during the storage of grapes, if the humidity is relatively high, Botrytis cinerea is likely to infect the fruits, forming gray mold disease.

[0003] Chinese Patent CN117958306A discloses a fruit and vegetable quick-freezing and low-temperature preservation device, including a quick-freezing box. The upper side wall of the quick-freezing box is fixedly connected with a refrigeration box. The rear side of the quick-freezing box is fixedly connected with a circulation pump. The water outlet end of the circulation pump is fixedly communicated with a water suction pipe. One end of the water suction pipe penetrates through the side wall of the refrigeration box and extends inward. The inner wall of the quick-freezing box is fixedly installed with a refrigeration pipe. One end of the refrigeration pipe penetrates through the side wall of the quick-freezing box and is fixedly communicated with the output end of the circulation pump.

[0004] Although the above device can rotate multiple placement boxes for placing fruits and vegetables in the quick-freezing box when quick-freezing fruits and vegetables, enabling the outer surfaces of the fruits and vegetables to be evenly quick-frozen by the cold air emitted by the refrigeration pipes, achieving effective freezing of the fruit and vegetable surfaces, during the rotation process, the fruits and vegetables will collide, resulting in damage to the fruit and vegetable epidermis during the collision, reducing the integrity of the fruits and vegetables. Moreover, when facing different fruits and vegetables, it is impossible to adjust the internal air humidity according to the types and quantities of fruits and vegetables, resulting in excessive water loss when the humidity of the fruits and vegetables is too low, and facilitating the growth of microorganisms when the humidity is too high, with low applicability and adjustability. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an agricultural fruit and vegetable preservation device, which solves the problems of humidity regulation and damage of fruits and vegetables.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: An agricultural fruit and vegetable preservation device includes a preservation tank. A humidifier and a dehumidifier are arranged at the top of the preservation tank. A feed hopper is arranged on the upper side of the outer surface of the preservation tank. An opening and closing plate is arranged on the lower side of the outer surface of the preservation tank.

[0007] Preferably, the preservation tank includes a storage tank, an inner upper part of the storage tank is embedded with a cooling and preservation tank, an inner bottom end of the preservation tank is fixedly connected with a humidity adaptation component, an inner top end of the storage tank is rotatably connected with a conveying fan, a top end of the conveying fan extends to the outside of the top end of the storage tank, a driving motor is arranged at the top end of the conveying fan, outlets of the humidifier and the dehumidifier both extend to the inner top end of the storage tank, and the conveying fan is located below the humidifier and the dehumidifier.

[0008] Preferably, the humidity adaptation component includes a support spring, a bottom end of the support spring is fixedly connected to the inner bottom end of the storage tank, a top end of the support spring is fixedly connected with a bearing plate, an outer surface of the bearing plate is slidably connected to the inside of the storage tank, a middle part of a top end of the bearing plate is fixedly connected with a corrugated pipe, a plurality of humidity regulation holes are formed at corrugated parts of the corrugated pipe, a top end of the corrugated pipe is fixedly connected with a fixed plate, an outer side of a top end of the fixed plate is fixedly connected to an upper side inside the storage tank, and a plurality of ultraviolet lamps are fixedly connected to the top end of the fixed plate.

[0009] Preferably, a lower part inside the storage tank is communicated with the inside of the corrugated pipe through the humidity regulation holes, and the inside of the corrugated pipe is communicated with an upper part inside the storage tank through the middle part of the fixed plate.

[0010] Preferably, the cooling and preservation tank includes a spiral material guiding groove, the material guiding groove is formed in the upper part inside the storage tank, a spiral ozone generating pipe is fixedly connected to an upper side inside the material guiding groove, the material guiding groove can be communicated with the bottom of a feed hopper, a bottom end of the material guiding groove is communicated with a lower part inside the storage tank, and one side of the material guiding groove close to the humidity adaptation component is communicated with an upper part inside the storage tank.

[0011] Preferably, the opening and closing plate includes a switch plate, a bottom end of the switch plate is rotatably connected to an outer surface of the storage tank, a moving handle is slidably connected between left and right sides of the switch plate, lifting sliding grooves are formed in the storage tank on both left and right sides of the switch plate, a plurality of positioning holes are formed at both left and right ends inside the lifting sliding grooves, a U-shaped positioning and moving pull rod penetrates through the moving handle in a left-right direction and is movably connected, and two ends of the positioning and moving pull rod are respectively slidably connected to the inside of the lifting sliding grooves.

[0012] Preferably, the positioning and moving pull rod includes a U-shaped positioning pull rod, connection plates are fixedly connected to outer surfaces of both ends of the positioning pull rod, a traction spring is fixedly connected to an outer side of one end of each connection plate close to the lifting sliding groove, a moving column is fixedly connected to an end of the traction spring far away from the connection plate, left and right ends of the moving column are slidably connected to the inside of the lifting sliding grooves, two positioning balls are movably connected to the inside of the moving column, one end of the positioning pull rod can slide into the inside of the moving column, and conical fixing push heads are fixedly connected to both ends of the positioning pull rod and are located between the two positioning balls.

[0013] Preferably, only one-third of the positioning ball can extend out of the moving column.

[0014] The present invention provides an agricultural fruit and vegetable fresh-keeping device. Compared with the prior art, it has the following beneficial effects: (1) In this fruit and vegetable fresh-keeping device, the fruits and vegetables move downward along a spiral track through the spiral guide groove. In a vacuum environment, the temperature of the fruits and vegetables rapidly drops by using the principle of vacuum evaporation and heat absorption. The ozone generated by the ozone generating tube circulates in the spiral channel along with the air flow, and the cell membranes of microorganisms on the surface of the fruits and vegetables are destroyed by strong oxidation. Moreover, through the rotation of the spiral guide groove when the fruits and vegetables roll, the fruits and vegetables are comprehensively cooled and sterilized, achieving the dual effects of pre-cooling and sterilization, and improving the fresh-keeping efficiency and effect of the device.

[0015] (2) In this fruit and vegetable fresh-keeping device, the bearing plate can stably catch the fruits and vegetables that have been disinfected and cooled, and can compress the support spring according to the quantity, so that the falling fruits and vegetables always stay at the top, preventing excessive collision damage to the epidermis during the movement of the fruits and vegetables, improving the integrity and quality of the fruits and vegetables. At the same time, the bearing plate can adaptively adjust the internal humidity through the folded expansion humidity control holes according to the rise and fall of the quantity of fruits and vegetables, improving the humidity control effect of the device.

[0016] (3) In this fruit and vegetable fresh-keeping device, through the ingenious cooperation of the positioning moving pull rod with the lifting chute and the positioning hole, the staff can flexibly adjust the opening and closing angle of the switch plate according to actual needs, facilitating batch access to fruits and vegetables. And it can timely position the angle of the switch plate when the positioning pull rod is released, preventing excessive rolling and spilling of fruits and vegetables, achieving instant stop and locking, and improving the convenience and fixing effect during picking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a cross-sectional view of the internal structure of the present invention; Figure 3 is a schematic structural diagram of the humidity adaptation component of the present invention; Figure 4 is a schematic structural diagram of the cooling and fresh-keeping tank of the present invention; Figure 5 is a schematic structural diagram of the opening and closing plate of the present invention; Figure 6 is a schematic structural diagram of the positioning moving pull rod of the present invention.

[0018] In the figure: 1. Feed hopper; 2. Opening and closing plate; 21. Switching plate; 22. Moving handle; 23. Positioning moving pull rod; 231. Positioning pull rod; 232. Connecting plate; 233. Traction spring; 234. Moving column; 235. Positioning ball; 236. Fixed push head; 24. Lifting chute; 25. Positioning hole; 3. Humidifier; 4. Dehumidifier; 5. Fresh-keeping tank; 51. Storage tank; 52. Conveyor fan; 53. Cooling and fresh-keeping tank; 531. Ozone generating tube; 532. Feeding chute; 54. Humidity adaptation component; 541. Ultraviolet lamp; 542. Fixed plate; 543. Bellows; 544. Humidity control hole; 545. Bearing plate; 546. Support spring. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-6 , the embodiments of the present invention provide a technical solution: an agricultural fruit and vegetable fresh-keeping device, including a fresh-keeping tank 5, a humidifier 3 and a dehumidifier 4 are arranged at the top of the fresh-keeping tank 5, a feed hopper 1 is arranged on the upper side of the outer surface of the fresh-keeping tank 5, and an opening and closing plate 2 is arranged on the lower side of the outer surface of the fresh-keeping tank 5.

[0021] Fruits and vegetables enter the device through the feed hopper 1 at the top of the fresh-keeping tank. The humidifier 3 and the dehumidifier 4 adjust the storage environment in real time according to the set humidity parameters to ensure that the humidity in the fresh-keeping tank 5 is within an appropriate range. When it is necessary to take out the fruits and vegetables, by operating the opening and closing plate 2 on the lower side of the outer surface of the fresh-keeping tank, the pickup opening at the bottom of the device can be conveniently opened or closed to meet the daily storage and retrieval needs.

[0022] The inside of the whole device is kept in a negative pressure state by an external vacuum compressor. The humidifier 3 and the dehumidifier 4 are prior arts and will not be elaborated here.

[0023] Please refer to Figure 2 , the fresh-keeping tank 5 includes a storage tank 51, a cooling and fresh-keeping tank 53 is embedded above the inner side of the storage tank 51, a humidity adaptation component 54 is fixedly connected to the bottom end of the inner side of the fresh-keeping tank 5, a conveyor fan 52 is rotatably connected to the top end of the inner side of the storage tank 51, the top end of the conveyor fan 52 extends to the outside of the top end of the storage tank 51, a driving motor is arranged at the top end of the conveyor fan 52, the outlets of the humidifier 3 and the dehumidifier 4 both extend to the top end of the inner side of the storage tank 51, and the conveyor fan 52 is located below the humidifier 3 and the dehumidifier 4.

[0024] The conveying fan 52 at the inner top of the storage tank 51 keeps running driven by the driving motor, evenly conveying the water vapor generated by the humidifier 3 or the dry air flow discharged by the dehumidifier 4 into the storage tank. The cooling and freshness-keeping tank 53 is located above the storage tank, preliminarily cooling and preprocessing the fruits and vegetables just entering the equipment, while the humidity adaptation component 54 at the bottom responds to the internal humidity change in real time and cooperates with the conveying fan to achieve the dynamic balance of temperature and humidity.

[0025] Please refer to Figure 3 , the humidity adaptation component 54 includes a support spring 546. The bottom end of the support spring 546 is fixedly connected to the inner bottom end of the storage tank 51, and the top end of the support spring 546 is fixedly connected with a bearing plate 545. The outer surface of the bearing plate 545 is slidably connected to the inside of the storage tank 51. The middle of the top end of the bearing plate 545 is fixedly connected with a corrugated pipe 543. A number of humidity control holes 544 are opened at the corrugated part of the corrugated pipe 543. The top end of the corrugated pipe 543 is fixedly connected with a fixed plate 542. The outer side of the top end of the fixed plate 542 is fixedly connected to the upper side inside the storage tank 51. A number of ultraviolet lamps 541 are fixedly connected to the top end of the fixed plate 542.

[0026] When the fruits and vegetables fall onto the bearing plate 545 after being processed above, the support spring 546 automatically compresses or rebounds according to the weight of the fruits and vegetables, keeping the bearing plate at a stable receiving height. The corrugated pipe 543 at the top end of the bearing plate is communicated with the inside of the storage tank through the humidity control holes 544 at the corrugated part. When the humidity is abnormal below, the water vapor can enter the corrugated pipe through the holes, and is guided to the upper part of the storage tank through the fixed plate 542. At the same time, the ultraviolet lamp 541 at the top end of the fixed plate continuously irradiates to perform antibacterial treatment on the surface of the fruits and vegetables in the bearing area.

[0027] Please refer to Figure 3 , the lower part inside the storage tank 51 can be communicated with the inside of the corrugated pipe 543 through the humidity control holes 544, and the inside of the corrugated pipe 543 is communicated with the upper part inside the storage tank 51 through the middle of the fixed plate 542.

[0028] Please refer to Figure 4 , the cooling and freshness-keeping tank 53 includes a spiral guide groove 532. The guide groove 532 is opened at the upper part inside the storage tank 51. A spiral ozone generating tube 531 is fixedly connected above the inner side of the guide groove 532. The guide groove 532 can be communicated with the bottom of the feed hopper 1. The bottom end of the guide groove 532 is communicated with the lower part inside the storage tank 51. One side of the guide groove 532 close to the humidity adaptation component 54 is communicated with the upper part inside the storage tank 51.

[0029] The fruits and vegetables enter the spiral guide groove 532 from the bottom of the feed hopper 1 and slowly move downward along the spiral track. During this process, the spiral ozone generating tube 531 continuously releases ozone to kill the microorganisms on the surface of the fruits and vegetables through strong oxidation. The bottom end of the guide groove is communicated with the lower part inside the storage tank 51, enabling the fruits and vegetables that have completed sterilization and preliminary cooling to smoothly fall into the bottom bearing area.

[0030] Please refer to Figure 5 , the opening and closing plate 2 includes a switch plate 21, the bottom end of the switch plate 21 is rotatably connected to the outer surface of the storage tank 51, a moving handle 22 is slidably connected to both the left and right sides of the switch plate 21, lifting sliding grooves 24 are provided on both the left and right sides of the storage tank 51 corresponding to the switch plate 21, a plurality of positioning holes 25 are provided at both the left and right ends inside the lifting sliding grooves 24, a U-shaped positioning and moving pull rod 23 is movably connected through the left and right sides of the moving handle 22, and both ends of the positioning and moving pull rod 23 are slidably connected to the inside of the lifting sliding grooves 24 respectively.

[0031] When it is necessary to open the opening and closing plate 2, pull the moving handle 22 and the positioning and moving pull rod 23 to drive the switch plate 21 to rotate upward around the bottom end rotation shaft. The positioning and moving pull rods 23 on both sides of the switch plate slide in the lifting sliding grooves 24 along with the handle. When the switch plate is opened to the required angle, release the positioning and moving pull rod 23 to fix the position of the switch plate, which is convenient for the staff to batch access fruits and vegetables. After the operation is completed, it can be easily reset and closed to form a sealed fresh-keeping environment.

[0032] Please refer to Figure 6 , the positioning and moving pull rod 23 includes a U-shaped positioning pull rod 231, connection disks 232 are fixedly connected to the outer surfaces of both ends of the positioning pull rod 231, a traction spring 233 is fixedly connected to the outside of one end of the connection disk 232 close to the lifting sliding groove 24, a moving column 234 is fixedly connected to the end of the traction spring 233 away from the connection disk 232, the left and right ends of the moving column 234 are slidably connected to the inside of the lifting sliding groove 24, two positioning balls 235 are movably connected inside the moving column 234, one end of the positioning pull rod 231 can slide into the inside of the moving column 234, and conical fixing push heads 236 are fixedly connected to both ends of the positioning pull rod 231, and the fixing push heads 236 are located between the two positioning balls 235.

[0033] Please refer to Figure 6 , only one-third of the positioning ball 235 can protrude from the moving column 234.

[0034] When pulling the positioning pull rod 231, the conical fixing push heads 236 at both ends thereof squeeze the positioning balls 235 inside the moving column 234, causing the positioning balls to contract and disengage from the positioning holes 25 of the lifting sliding groove 24. At this time, the moving column can be freely slid to adjust the opening and closing angle of the switch plate 21. After releasing the hand, the traction spring 233 pulls the connection disk 232 to reset, and the positioning balls pop out and are stuck in the positioning holes under the jacking action of the fixing push heads 236. Through the design of only one-third of the spherical surface being exposed, the stable locking of the switch plate angle is realized, preventing accidental sliding or closing.

[0035] Please refer to Figures 1-6 , during operation, First, pour fruits and vegetables into the equipment through the feed hopper 1 at the top of the fresh-keeping tank. The fruits and vegetables enter the spiral guide trough 532 along the bottom of the feed hopper. The fruits and vegetables slowly move down along the spiral track in the guide trough 532. The spiral ozone generating tube 531 in the trough releases ozone, and kills the microorganisms on the surface of the fruits and vegetables through strong oxidation to complete the preliminary disinfection. The processed fruits and vegetables fall into the bottom bearing plate 545. The support spring 546 automatically adjusts the bearing height according to the weight to ensure that the fruits and vegetables stay at the top to avoid collision. The corrugated pipe 543 at the top of the bearing plate communicates with the upper and lower areas of the storage tank through the humidity control hole 544, and cooperates with the top humidifier 3, dehumidifier 4 and conveyor fan 52 to realize the adaptive control of the internal humidity. Pull the moving handle 22 of the opening and closing plate 2, and adjust the switch plate 21 to an appropriate angle through the cooperation of the positioning moving rod 23 and the positioning hole 25 of the lifting chute 24. After batch-taking out the fruits and vegetables, reset and close to form a sealed fresh-keeping environment.

[0036] Meanwhile, the content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art.

[0037] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An agricultural fruit and vegetable preservation device, including a preservation tank (5), characterized in that: A humidifier (3) and a dehumidifier (4) are provided at the top of the fresh-keeping tank (5). A feed hopper (1) is provided on the upper side of the outer surface of the fresh-keeping tank (5), and an opening and closing plate (2) is provided on the lower side of the outer surface of the fresh-keeping tank (5).

2. The agricultural fruit and vegetable fresh-keeping device according to claim 1, wherein: The fresh-keeping tank (5) includes a storage tank (51). An air-cooling fresh-keeping tank (53) is embedded above the inner side of the storage tank (51). A humidity adaptation component (54) is fixedly connected to the bottom end inside the fresh-keeping tank (5). A conveying fan (52) is rotatably connected to the top end inside the storage tank (51). The top end of the conveying fan (52) extends to the outside of the top end of the storage tank (51). A driving motor is provided at the top end of the conveying fan (52). The outlets of the humidifier (3) and the dehumidifier (4) both extend to the top end inside the storage tank (51). The conveying fan (52) is located below the humidifier (3) and the dehumidifier (4).

3. An agricultural fruit and vegetable freshness preservation device according to claim 2, characterized in that: The humidity adaptation component (54) includes a support spring (546). The bottom end of the support spring (546) is fixedly connected to the bottom end inside the storage tank (51). The top end of the support spring (546) is fixedly connected to a bearing plate (545). The outer surface of the bearing plate (545) is slidably connected to the inside of the storage tank (51). The middle of the top end of the bearing plate (545) is fixedly connected to a corrugated pipe (543). A plurality of humidity control holes (544) are opened at the corrugated part of the corrugated pipe (543). The top end of the corrugated pipe (543) is fixedly connected to a fixed plate (542). The outer side of the top end of the fixed plate (542) is fixedly connected to the upper side inside the storage tank (51). A plurality of ultraviolet lamps (541) are fixedly connected to the top end of the fixed plate (542).

4. An agricultural fruit and vegetable freshness preservation device according to claim 3, characterized in that: The lower part inside the storage tank (51) can communicate with the inside of the corrugated pipe (543) through the humidity control holes (544). The inside of the corrugated pipe (543) communicates with the upper part inside the storage tank (51) through the middle of the fixed plate (542).

5. An agricultural fruit and vegetable freshness preservation device according to claim 4, characterized in that: The air-cooling fresh-keeping tank (53) includes a spiral material guiding groove (532). The material guiding groove (532) is opened above the inside of the storage tank (51). A spiral ozone generating pipe (531) is fixedly connected above the inner side of the material guiding groove (532). The material guiding groove (532) can communicate with the bottom of the feed hopper (1). The bottom end of the material guiding groove (532) communicates with the lower part inside the storage tank (51). One side of the material guiding groove (532) close to the humidity adaptation component (54) communicates with the upper part inside the storage tank (51).

6. An agricultural fruit and vegetable freshness preservation device according to claim 3, characterized in that: The opening and closing plate (2) includes a switch plate (21). The bottom end of the switch plate (21) is rotatably connected to the outer surface of the storage tank (51). A moving handle (22) is slidably connected to both the left and right sides of the switch plate (21). Lifting sliding grooves (24) are opened on both the left and right sides of the storage tank (51) corresponding to the switch plate (21). A plurality of positioning holes (25) are opened at both the left and right ends inside the lifting sliding grooves (24). A U-shaped positioning moving pull rod (23) is movably connected through the left and right of the moving handle (22). Both ends of the positioning moving pull rod (23) are slidably connected to the inside of the lifting sliding grooves (24).

7. An agricultural fruit and vegetable freshness preservation device according to claim 6, characterized in that: The positioning and moving pull rod (23) includes a U-shaped positioning pull rod (231). Both outer surfaces of the two ends of the positioning pull rod (231) are fixedly connected with connecting discs (232). One end of the connecting disc (232) close to the lifting chute (24) is fixedly connected with a traction spring (233). One end of the traction spring (233) away from the connecting disc (232) is fixedly connected with a moving column (234). The left and right ends of the moving column (234) are slidably connected to the inner side of the lifting chute (24). Two positioning balls (235) are movably connected inside the moving column (234). One end of the positioning pull rod (231) can slide into the inside of the moving column (234). Conical fixed push heads (236) are fixedly connected to both ends of the positioning pull rod (231). The fixed push heads (236) are located between the two positioning balls (235).

8. An agricultural fruit and vegetable fresh-keeping device according to claim 7, characterized in that: Only one-third of the positioning ball (235) can protrude from the moving column (234).

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