Device for removing astringency of persimmon and method for removing astringency thereof

Abstract

This application discloses a persimmon astringency removal device and a corresponding astringency removal method, relating to the field of fruit processing equipment technology. Addressing the problems of existing technologies where carbon dioxide absorbs a large amount of heat to change from liquid to gas, leading to a significant drop in the surrounding temperature of the injection pipe and causing frost damage to the persimmons, and the complexity of existing astringency removal containers making them unsuitable for on-site astringency removal in outdoor persimmon orchards, this application proposes a cuboid container welded from multiple steel plates as a storage chamber. The storage chamber is equipped with a door that ensures good sealing, and an intermittent circulating gas outlet device is installed inside the storage chamber. This intermittent circulating gas outlet device disperses and evenly distributes the injected carbon dioxide gas, thus solving the problem of persimmon frost damage caused by injecting gas through a single outlet in existing technologies. This solution is rationally designed, ingeniously structured, low in cost, and easy to operate.

Description

Technical Field

[0001] This application relates to the field of fruit processing equipment technology, and in particular to a device for removing astringency from persimmons and a method for doing so. Background Technology

[0002] Persimmons are a popular traditional fruit, known for their vibrant color and smooth, sweet taste. However, fresh persimmons contain soluble tannins, which can make them astringent and unpalatable. Therefore, fresh persimmons need to undergo a de-astringency treatment before consumption to convert the soluble tannins into insoluble, hardened tannins, eliminating the astringent taste. Most people can tolerate a soluble tannin content of 0.2%, and below this level, the astringency is imperceptible. There are many methods for de-astringing persimmons, and the techniques are relatively mature. Commonly used traditional methods include: warm water de-astringency, cold water de-astringency, lime water de-astringency, carbon dioxide de-astringency, and sealed packaging de-astringency. Currently, there are many devices in China that use carbon dioxide to remove astringency from persimmons. For example, there is a carbon dioxide deastringency device for persimmons disclosed in patent number CN205431945U, a carbon dioxide deastringency device for persimmons disclosed in patent number CN204393263U, and a CO2 deastringency tank for persimmons disclosed in patent number CN205947060U. All of these devices use a sealed container to inject carbon dioxide to remove astringency from persimmons. The common drawback of the above-mentioned similar structures is that if carbon dioxide gas is injected rapidly from a compressed gas cylinder through a gas tube, the temperature around the gas tube will drop significantly because carbon dioxide needs to absorb a lot of heat to change from a liquid to a gaseous state. Persimmons placed near the gas tube will freeze and become soft and rotten after the astringency is removed. Therefore, carbon dioxide gas can only be injected slowly, but this affects efficiency. In addition, the existing deastringency containers are relatively complex and not suitable for large-scale on-site deastringency operations in persimmon planting areas. Summary of the Invention

[0003] To address the aforementioned problems, one application provides a device for removing astringency from persimmons, comprising a storage chamber for holding persimmons and an air source. The storage chamber is a cuboid container welded from multiple steel plates with longitudinally and transversely distributed reinforcing ribs. The advantages of using steel plates welded into a cuboid container are its simple structure, ease of processing compared to other shapes, readily available materials, and the ability to operate without special processing, thus reducing the cost of the device.

[0004] A doorway is provided on one side of the storage compartment, which allows staff to easily enter and exit, and thus move the persimmons in or out.

[0005] A door frame is welded onto the door opening, and threaded holes are evenly distributed on the door frame;

[0006] A door leaf is hinged to one side of the door frame. A rubber pad is fixed on the door leaf. Bolt connection holes are opened at the joint between the door leaf, the rubber pad and the door frame. The door leaf is connected to the door frame by bolts to realize the fastening, sealing and opening / closing of the door leaf.

[0007] An air inlet pipe and an air outlet pipe are provided on one side of the storage compartment;

[0008] An air outlet valve is installed on the air outlet pipe;

[0009] The storage compartment is equipped with a pressure gauge;

[0010] The upper part of the inner wall of the storage compartment is provided with an intermittent circulating air outlet device, which is connected to the air inlet pipe inside the storage compartment.

[0011] The intermittent circulating gas release device includes multiple interconnected gas release valves that can open and close intermittently. This device disperses carbon dioxide gas within the storage chamber, preventing excessive concentration of carbon dioxide that could cause a rapid drop in localized temperature and lead to frost damage. The intermittent circulating gas release device can have various structures, such as multiple three-way solenoid valves connected in parallel on a single pipeline. By controlling the opening and closing of these valves, the device can release carbon dioxide gas at different times and locations, preventing concentrated release from a single point.

[0012] Preferably, the door frame is welded from channel steel and then welded to the compartment body and its reinforcing ribs to form a solid whole, which greatly improves the stability and safety of the entire door.

[0013] Preferably, the door leaf is made of steel plate, and a door handle and hinge are welded on the door leaf. Three or four bolts are welded on the inner side of the door leaf to fix the rubber pad on the door leaf. Bolt connection holes are opened around the door leaf and the rubber pad. After the door leaf is closed, the door leaf is fastened to the door frame with bolts to realize the closing and sealing of the storage compartment door.

[0014] Preferably, the intermittent circulating air outlet device includes a solenoid valve, a first connecting pipe, an air outlet valve, a one-way valve, a second connecting pipe, a proximity sensor, and a three-way connector;

[0015] The air inlet end of the solenoid valve is fixedly connected to one end of the air inlet pipe;

[0016] The outlet end of the solenoid valve is connected to the first end of the three-way connector;

[0017] The second end of the tee connector is connected to one end of the first connecting pipe;

[0018] The third end of the tee connector is connected to one end of the second connecting pipe;

[0019] The other end of the second connecting pipe is connected to the outlet end of the one-way valve;

[0020] The multiple exhaust valves are connected end to end, wherein the first exhaust valve is connected to the other end of the first connecting pipe, and the last exhaust valve is connected to the air inlet of the one-way valve.

[0021] The last exhaust valve is also equipped with a proximity sensor, the contact of which is connected in series with the control coil of the solenoid valve. When the proximity sensor receives a signal, the control coil of the solenoid valve is energized, and the solenoid valve cuts off the air path between the intake pipe and the intermittent circulating exhaust device. At this time, all exhaust valves automatically return to their initial state without pressure.

[0022] Preferably, the vent valve includes a vent valve body, which is a tubular structure with a vent valve inlet fixedly provided on one side; the vent valve body and the vent valve inlet form a T-shaped structure.

[0023] The exhaust valve body is fixedly provided with a lower sealing ring and an upper sealing ring, which are located on the upper and lower sides of the exhaust valve inlet end, respectively.

[0024] A sealing ball is movably disposed within the body of the air outlet valve, and the sealing ball is located between the lower sealing ring and the upper sealing ring.

[0025] A soft rope and an energy storage spring are fixedly installed on the sealing ball, and the soft rope is located inside the energy storage spring.

[0026] The soft rope and energy storage spring are fixedly connected to the bottom of the pull rod;

[0027] The top of the pull rod is fixedly connected to the baffle.

[0028] The baffle is located at the top of the outlet valve body and is connected to the outlet valve body via a positioning tension spring. The sealing ball is a hollow structure or a lightweight, smooth sphere, which, through its interaction with the sealing ring, opens or closes the valve for different gas openings. During operation, carbon dioxide gas enters from the outlet valve inlet. Since the positioning tension spring is a tension spring, it is always in a contracted state when not under force. Therefore, it moves the baffle, the pull rod rope, the energy storage tension spring, and the sealing ball downwards towards the sealing ring. Ultimately, the sealing ball blocks the lower sealing ring, which is the initial state of the entire valve. Carbon dioxide gas enters from the inlet of the outlet valve and exits from the unsealed upper part of the outlet valve body. During the outlet process, the gas impacts the baffle. The baffle first moves the pull rod rope and the energy storage spring upward. Due to the pressure inside the valve body, the sealing ball does not move yet, so the energy storage spring is stretched and stores energy. When the baffle moves to a certain extent, the rope is tightened, pulling the sealing ball upward. At this time, the sealing ball leaves the lower sealing ring. Simultaneously, the gas pressure inside the valve body drops. Under the action of the energy storage spring, the sealing ball continues to move upward and finally contacts the upper sealing ring, blocking the upper outlet of the outlet valve body. At this point, the gas can only flow from the bottom into the next outlet valve. All outlet valves cycle through the above actions until the last outlet valve is activated. When the last outlet valve is activated, the proximity sensor obtains a signal by detecting the baffle of the last outlet valve, controlling the solenoid valve to cut off the gas path of the inlet pipe and the intermittent cycle outlet device. At this time, all outlet valves automatically return to their initial state without pressure. After all outlet valves return to their state, the solenoid valve automatically reconnects the gas path, thus restarting the cycle of opening all outlet valves in the circuit. In this way, the vent valves can be switched on and off sequentially, preventing carbon dioxide gas from escaping from only one place and causing frost damage to the persimmons.

[0029] Preferably, a permanent magnet housing is also provided outside the lower sealing ring;

[0030] The sealing ball is made of a hollow spherical structure using a magnetically conductive material. This design improves the initial sealing performance of the vent valve and also enhances its energy storage effect during the energy storage spring operation.

[0031] Preferably, a gas collecting ring is also fixedly installed inside the gas outlet valve body, and the gas collecting ring is located at the top outlet of the gas outlet valve body;

[0032] The gas collecting ring is a circular disc structure with a jet nozzle at its center. The pull rod can slide through the jet nozzle. This design concentrates the gas inside the exhaust valve body into a single point, resulting in a strong gas ejection that is powerful enough to move the baffle.

[0033] This application second provides a method for removing astringency from persimmons based on the above-mentioned persimmon astringency removal device, including the following steps:

[0034] S1. Pack the persimmons that have been picked from the fruit trees and are waiting to be de-astringed into designated fruit baskets;

[0035] S2. Move the fruit baskets containing the persimmons to be de-astringed into the storage room and stack them neatly in order;

[0036] S3. Secure the door and frame of the storage compartment after it is filled with fruit baskets with bolts.

[0037] S4. Connect the intake pipe to the air source;

[0038] S5. Open the gas source to inject carbon dioxide gas: During injection, carbon dioxide gas is injected into different locations in the storage chamber through an intermittent circulation gas outlet device to prevent the persimmons from freezing due to excessively low temperature in a certain location.

[0039] S6. Stop injecting carbon dioxide gas once the pressure is greater than or equal to 0.1 MPa;

[0040] S7. After 5-6 hours, observe the pressure gauge. When it drops to 0.08 MPa, replenish the air. Stop injecting air when the pressure reaches 0.1 MPa. Repeat this cycle until desiccation is complete. In hot summer weather, it takes about 3 times to replenish air for one batch. In September and October, when the temperature is higher, it takes about 6-7 hours to replenish air, and the total processing time is about 27-28 hours. In cold weather, the total processing time is about 35-40 hours.

[0041] The persimmon astringency removal device of this application utilizes multiple steel plates welded into a cuboid container as a storage chamber, and has a door on the storage chamber that can achieve good sealing, and an intermittent circulating gas outlet device is set in the storage chamber. This intermittent circulating gas outlet device can disperse and evenly discharge the injected carbon dioxide gas, thereby solving the problem of persimmon frost damage caused by injecting gas through only a single outlet in the prior art. The solution is reasonably designed, ingeniously structured, low in cost, and easy to operate. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of the embodiments provided in this application;

[0043] Figure 2 This is a schematic diagram of the intermittent circulating air outlet device in the embodiments provided in this application;

[0044] Figure 3 This is a three-dimensional schematic diagram of the exhaust valve in the embodiments provided in this application;

[0045] Figure 4 This is an exploded schematic diagram of the vent valve in the embodiments provided in this application;

[0046] Figure 5 This is a cross-sectional view of the exhaust valve in the embodiment provided in this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-5 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to represent selected embodiments of this application. In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] like Figure 1 As shown, a device for removing astringency from persimmons includes a storage chamber 1 for holding persimmons and an air source. This is similar to the prior art, but the difference is that the storage chamber 1 is made of multiple steel plates 10 welded into a cuboid container structure. The cuboid container structure made of steel plates is easier to process than other shapes, and the materials are also easy to purchase. It can be operated without special processing, which is convenient for field construction and can also reduce the cost of the device.

[0052] A doorway 12 is provided on one side of the storage compartment 1, which facilitates the entry and exit of staff to move persimmons in or out.

[0053] A door frame 13 is fixedly installed around the door opening 12, and a fixing threaded hole 130 is vertically opened on the door frame 13. A door leaf 14 is hinged to one side of the door frame 13, and a fixing hole 140 is opened on the door leaf 14. The fixing hole 140 and the fixing threaded hole 130 correspond to each other and match each other. The door leaf 14 can be fixedly connected by bolts passing through the fixing hole 140 and the fixing threaded hole 130.

[0054] An air inlet pipe 15 and an air outlet pipe 16 are provided on one side of the storage compartment 1. An air outlet valve is provided on the air outlet pipe 16. In addition, a pressure gauge is provided on the storage compartment 1 to observe the gas pressure.

[0055] An intermittent circulating venting device 2 is provided around the upper part of the inner wall of the storage chamber 1, and the intermittent circulating venting device 2 is connected to the inner side of the air inlet pipe 15. The intermittent circulating venting device 2 includes multiple interconnected venting valves 22, which can be opened and closed intermittently. The intermittent circulating venting device 2 is used to disperse the carbon dioxide gas in the storage chamber 1, preventing carbon dioxide from concentrating in one place and causing the surrounding temperature to drop too quickly, resulting in frostbite. The intermittent circulating venting device 2 can have many structures, such as multiple three-way solenoid valves connected in parallel on a pipeline. By controlling the solenoid valves to open or close different solenoid valves at different times to release gas, carbon dioxide can be prevented from being discharged from only one place.

[0056] In one embodiment, the door frame 13 is welded together and then welded to the compartment body and the compartment body reinforcing ribs to form a solid whole, which greatly improves the stability and safety of the entire door.

[0057] A rubber gasket for sealing is installed between the door leaf 14 and the door frame 13. The rubber gasket is fixed to the door leaf by two bolts on the door leaf. The door leaf 14 is welded from steel plate and angle steel, with the angle steel serving as the door frame and the steel plate welded onto the frame. This structure makes the door leaf itself a container structure with one side open, inside which a sealing rubber plate is installed. This opening corresponds precisely to the door frame, effectively achieving a sealing function.

[0058] A cuboid container, formed by welding multiple steel plates 10, has multiple reinforcing ribs 11 welded to its outer perimeter. The reinforcing ribs 11 are distributed in a crisscross pattern, and are channel steel. The reinforcing ribs 11 are used to make the entire container more stable and prevent the container from deforming due to excessive internal air pressure.

[0059] In one embodiment, such as Figures 2-5 As shown, the intermittent circulating air supply device 2 includes a solenoid valve 20, a first connecting pipe 21, an air outlet valve 22, a one-way valve 23, a second connecting pipe 24, a proximity sensor 25, and a three-way connector. The air inlet of the solenoid valve 20 is fixedly connected to one end of the air inlet pipe 15. When energized, the solenoid valve 20 cuts off the air supply; when de-energized, it connects the air supply. The air outlet of the solenoid valve 20 is connected to the first end of the three-way connector. The second end of the three-way connector is connected to one end of the first connecting pipe 21, and the third end of the three-way connector is connected to one end of the second connecting pipe 24. The other end of the second connecting pipe 24 is connected to the air outlet of the one-way valve 23.

[0060] Multiple exhaust valves 22 are connected end-to-end, and this embodiment uses a total of 11 exhaust valves, which form a closed-loop structure. Specifically, the first exhaust valve is connected to the other end of the first connecting pipe 21, and the last exhaust valve is connected to the inlet end of the one-way valve 23. The function of the one-way valve 23 is to prevent carbon dioxide gas from entering in the reverse direction and affecting the valve's operating sequence.

[0061] The last exhaust valve ( Figure 2 A proximity sensor 25 is also installed on the 11th air outlet valve (rotated counterclockwise). The contact of the proximity sensor 25 is connected in series with the control coil of the solenoid valve 20. When the proximity sensor 25 receives a signal, the control coil of the solenoid valve 20 is energized, and the solenoid valve 20 cuts off the air path between the air inlet pipe 15 and the intermittent circulating air outlet device 2. At this time, all the air outlet valves 22 lose pressure and automatically return to their initial state.

[0062] More specifically, the aforementioned air outlet valve 22 includes an air outlet valve body 220, which is a tubular structure with an air outlet valve inlet 221 fixedly provided on one side; the air outlet valve body 220 and the air outlet valve inlet 221 form a T-shaped structure.

[0063] The exhaust valve body 220 is fixedly provided with a lower sealing ring 223 and an upper sealing ring 228, which are located on the upper and lower sides of the exhaust valve inlet end 221, respectively. Both the lower sealing ring 223 and the upper sealing ring 228 are made of flexible materials such as rubber and have a hollow cone structure, which makes it easier to achieve a seal.

[0064] A sealing ball 224 is movably disposed inside the air outlet valve body 220, and the sealing ball 224 is located between the lower sealing ring 223 and the upper sealing ring 228.

[0065] A soft rope 225 and an energy storage spring 226 are fixedly installed on the sealing ball 224, with the soft rope 225 located inside the energy storage spring 226;

[0066] The soft rope 225, the energy storage spring 226 and the bottom of the pull rod 227 are fixedly connected. The length of the soft rope 225 after being straightened is greater than the length of the energy storage spring 226 in its natural state. Through testing, it is found that the length of the soft rope 225 after being straightened is 1.5 to 2 times the length of the energy storage spring 226 in its natural state.

[0067] The top of the lever 227 is fixedly connected to the baffle 22B. The baffle 22B has a disc-shaped structure, and its overall shape is C-shaped. The opening faces the lever 227, which allows the sprayed carbon dioxide gas to disperse and move backward, preventing direct spraying.

[0068] The baffle 22B is located at the top of the air outlet valve body 220, and the baffle 22B is connected to the air outlet valve body 220 through the positioning tension spring 22A.

[0069] In addition, in one embodiment, a permanent magnet housing 222 is provided outside the lower sealing ring 223, and the sealing ball 224 is made of a hollow spherical structure using a magnetically conductive material. This design improves the sealing performance of the exhaust valve 22 in the initial state and also enhances its energy storage effect when the energy storage spring 226 stores energy. An air collecting ring 229 is also fixedly installed inside the exhaust valve body 220, located at the top outlet of the exhaust valve body 220. The air collecting ring 229 has a circular disc structure with a jet hole in its center, and the pull rod 227 can slide through the jet hole. This design concentrates the gas inside the exhaust valve body 220 to a single point, resulting in a strong gas ejection sufficient to move the baffle 22B.

[0070] The sealing ball 224 is a hollow structure or a lightweight smooth sphere that, through its interaction with the sealing ring, enables the opening or closing of different openings for gas.

[0071] During operation, carbon dioxide gas enters from the inlet end 221 of the outlet valve. Since the positioning spring 22A is a type of spring, it is always in a contracted state when not under force. Therefore, it moves the baffle 22B, the pull rod 227, the soft rope 225, the energy storage spring 226, and the sealing ball 224 towards the lower sealing ring 223. Finally, the sealing ball 224 blocks the lower sealing ring 223, which is the initial state of the entire valve. Carbon dioxide gas enters from the inlet 221 of the outlet valve and exits from the unsealed upper end of the outlet valve body 220. During the gas exit process, the gas impacts the baffle 22B. The baffle 22B first drives the pull rod 227, the soft rope 225, and the energy storage spring 226 to move upward. Due to the pressure inside the valve body, the sealing ball 224 will not move yet, so the energy storage spring 226 is stretched and stores energy. When the baffle 22B moves to a certain extent, the soft rope 225 is tightened, pulling the sealing ball 224 to move upward. At this time, the sealing ball 224 leaves the lower sealing ring 223. At the same time, the gas pressure inside the valve body drops. Under the action of the energy storage spring 226, the sealing ball 224 continues to move upward and finally contacts the upper sealing ring 228 and blocks the upper outlet of the outlet valve body 220. At this time, the gas can only flow from the bottom into the next outlet valve 22. All the exhaust valves 22 cycle through the above actions until the last exhaust valve 22 activates. At this point, the proximity sensor 25 detects the baffle 22B of the last exhaust valve 22 and controls the solenoid valve 20 to cut off the airflow between the intake pipe 15 and the intermittent circulating exhaust device 2. At this time, all the exhaust valves 22 automatically return to their initial state without pressure. After all the exhaust valves 22 return to their original state, the solenoid valve 20 automatically reconnects the airflow, thus restarting the cycle of opening all the exhaust valves in the circuit. In this way, the exhaust valves can be sequentially and cyclically activated, preventing carbon dioxide gas from escaping from only one location and causing frost damage to the persimmons.

[0072] The following is a detailed description of the astringency removal method of the entire persimmon astringency removal device:

[0073] Step 1: Pack the persimmons that have been picked from the fruit trees and are ready to be de-astringed into designated fruit baskets;

[0074] Step 2: Move the fruit baskets containing the persimmons to be de-astringed into storage compartment 1 and stack them neatly in order;

[0075] Step 3: Secure the door 14 of the storage compartment 1, which is filled with fruit baskets, to the door frame 13 with bolts;

[0076] Step 4: Connect the air intake pipe 15 to the air source;

[0077] Step 5: Turn on the gas source to inject carbon dioxide gas: During injection, carbon dioxide gas is injected into different locations in the storage chamber 1 through the intermittent circulation gas outlet device 2 to prevent the persimmons from freezing due to excessively low temperature in one location.

[0078] Step 6: Stop injecting carbon dioxide gas once the pressure is greater than or equal to 0.1 MPa.

[0079] Step 7: After 5-6 hours, observe the pressure gauge. When it drops to 0.08 MPa, replenish the air. Stop injecting air when the pressure reaches 0.1 MPa. Repeat this cycle until desiccation is complete. In hot summer weather, it takes about 3 times to replenish air for one batch. In September and October, when the temperature is higher, it takes about 6-7 hours to replenish air, and the total processing time is about 27-28 hours. If the weather is cold (below 10℃), the total processing time is about 35-40 hours.

[0080] The persimmon astringency removal device of this application utilizes multiple steel plates 10 welded into a cuboid container as a storage chamber 1, and has a door on the storage chamber 1 that can achieve good sealing, and an intermittent circulating gas outlet device 2 is set in the storage chamber 1. The intermittent circulating gas outlet device 2 can disperse and evenly discharge the injected carbon dioxide gas, thereby solving the problem of persimmon frost damage caused by injecting gas through only a single outlet in the prior art. The solution is reasonably designed, ingeniously structured, low in cost, and easy to operate.

Claims

1. A device for removing astringency from persimmons, comprising a storage chamber (1) for holding persimmons and an air source, characterized in that: The storage compartment (1) is constructed by welding multiple steel plates (10) into a cuboid container structure; A doorway (12) is provided on one side of the storage compartment (1); A door frame (13) is fixedly installed around the door opening (12), and a fixed threaded hole (130) is vertically opened on the door frame (13). A door leaf (14) is hinged to one side of the door frame (13). A fixing hole (140) is provided on the door leaf (14). The fixing hole (140) and the fixing threaded hole (130) correspond to each other and match. The door leaf (14) can be fixedly connected by screws passing through the fixing hole (140) and the fixing threaded hole (130). An air inlet pipe (15) and an air outlet pipe (16) are provided on one side of the storage compartment (1). An air outlet valve is provided on the air outlet pipe (16); The storage compartment (1) is also equipped with a pressure gauge; The upper part of the inner wall of the storage compartment (1) is provided with an intermittent circulating air outlet device (2), which is connected to the inner side of the air inlet pipe (15). The intermittent circulating air outlet device (2) includes a plurality of interconnected air outlet valves (22), which can be intermittently opened and closed; The intermittent circulating air outlet device (2) includes a solenoid valve (20), a first connecting pipe (21), an air outlet valve (22), a one-way valve (23), a second connecting pipe (24), a proximity sensor (25), and a three-way connector; The air inlet end of the solenoid valve (20) is fixedly connected to one end of the air inlet pipe (15); The outlet end of the solenoid valve (20) is connected to the first end of the three-way connector; The second end of the three-way connector is connected to one end of the first connecting pipe (21); The third end of the three-way connector is connected to one end of the second connecting pipe (24); The other end of the second connecting pipe (24) is connected to the outlet end of the one-way valve (23); Multiple air outlet valves (22) are connected end to end, wherein the first air outlet valve is connected to the other end of the first connecting pipe (21), and the last air outlet valve is connected to the air inlet of the one-way valve (23). The last exhaust valve is also equipped with a proximity sensor (25), the contact of which is connected in series with the control coil of the solenoid valve (20); The air outlet valve (22) includes an air outlet valve body (220), which is a tubular structure with an air outlet valve inlet (221) fixedly provided on one side. The exhaust valve body (220) is fixedly provided with a lower sealing ring (223) and an upper sealing ring (228), which are located on the upper and lower sides of the exhaust valve inlet end (221), respectively. A sealing ball (224) is movably disposed inside the air outlet valve body (220), and the sealing ball (224) is located between the lower sealing ring (223) and the upper sealing ring (228); A soft rope (225) and an energy storage spring (226) are fixedly installed on the sealing ball (224), and the soft rope (225) is located inside the energy storage spring (226); The soft rope (225), the energy storage spring (226), and the bottom of the pull rod (227) are fixedly connected; The top of the pull rod (227) is fixedly connected to the baffle (22B); The baffle (22B) is located at the top of the air outlet valve body (220), and the baffle (22B) is connected to the air outlet valve body (220) by a positioning tension spring (22A).

2. The persimmon astringency removal device according to claim 1, characterized in that: The door frame (13) is made of channel steel, which wraps around and fastens to the side wall of the door opening (12) and is welded and fixed. The fixed threaded hole (130) is provided on one side of the channel steel.

3. The persimmon astringency removal device according to claim 2, characterized in that: The door leaf (14) is made of steel plate and angle steel welded together. The angle steel serves as the door frame, and the steel plate is welded onto the door frame.

4. The persimmon astringency removal device according to claim 3, characterized in that: A rubber gasket for sealing is provided between the door leaf (14) and the door frame (13).

5. The persimmon astringency removal device according to claim 1, characterized in that: The outer periphery of the cuboid container formed by welding multiple steel plates (10) has multiple reinforcing ribs (11) welded on it. The reinforcing ribs (11) are distributed in a crisscross pattern and are channel steel.

6. The persimmon astringency removal device according to claim 1, characterized in that: A permanent magnet housing (222) is also provided outside the lower sealing ring (223); The sealing ball (224) is made of a magnetically conductive material and has a hollow spherical structure.

7. The persimmon astringency removal device according to claim 6, characterized in that: An air collecting ring (229) is also fixedly installed inside the air outlet valve body (220), and the air collecting ring (229) is located at the top outlet of the air outlet valve body (220); The gas collecting ring (229) is a circular plate structure with a jet hole in the center, and the pull rod (227) can slide through the jet hole.

8. A method for removing astringency from persimmons based on the astringency removal device of claim 7, characterized in that, Includes the following steps: S1. Pack the persimmons that have been picked from the fruit trees and are waiting to be de-astringed into designated fruit baskets; S2. Move the fruit baskets containing the persimmons to be de-astringed into the storage chamber (1) and stack them neatly in order; S3. Secure the door (14) of the storage compartment (1) after it is filled with fruit baskets to the door frame (13) with screws; S4. Connect the air intake pipe (15) to the air source; S5. Open the gas source to inject carbon dioxide gas: During injection, carbon dioxide gas is injected into different locations in the storage chamber (1) through the intermittent circulation gas outlet device (2) to prevent the persimmons from freezing due to excessively low temperature in one location; S6. Stop injecting carbon dioxide gas once the pressure is greater than or equal to 0.1 MPa; S7. After 5-6 hours, observe the pressure gauge and when it drops to 0.08MPa, add air again. Stop injecting air when it reaches 0.1MPa. Repeat this cycle until desiccation is complete.

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