Fruit and vegetable pre-cooling assembly, fruit and vegetable pre-cooling device and pre-cooling method

Abstract

The invention provides a fruit and vegetable pre-cooling assembly, a fruit and vegetable pre-cooling device and a pre-cooling method. The fruit and vegetable pre-cooling assembly comprises a movable ice making device which comprises a vehicle body, a refrigeration assembly and a water tank, and the refrigeration assembly and the water tank are arranged on the vehicle body; a refrigeration part of the refrigeration assembly exchanges heat with water in the water tank, so that the water in the water tank forms an ice-water mixed phase; the fruit and vegetable frame is placed on the first lifting platform; the first lifting table can ascend and descend in the vertical direction. When the first lifting platform descends to the lowest position, the fruit and vegetable frame sinks into the water tank. Ice water is made through the movable ice making device, picked fruits and vegetables can be pre-cooled conveniently in time, and the fresh-keeping period of the fruits and vegetables can be prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of fruit and vegetable precooling devices, and specifically relates to a fruit and vegetable precooling component, a fruit and vegetable precooling device, and a precooling method. Background Art

[0002] As the quality of life continues to improve, consumers have increasingly stringent requirements for food freshness. However, most fresh fruits and vegetables have a short natural shelf life, which limits their storage and long-distance transportation capabilities. In order to meet market demand, it is essential to extend the shelf life of fruits and vegetables. By adopting advanced preservation technology, we can not only ensure the freshness of fruits and vegetables during long-term storage, but also distribute them safely and efficiently across the country, so that every consumer can enjoy the gift from nature.

[0003] After picking, fruits and vegetables carry a lot of field heat and have high respiration intensity. If they are not pre-cooled in time, the spoilage rate will increase, seriously affecting the quality. Therefore, pre-cooling is a key link in cold chain logistics, and its timeliness directly determines the storage time of fruits and vegetables.

[0004] Most of the existing precooling methods use ice water precooling, which generally involves adding ice cubes to water, then manually moving the fruits and vegetables to the ice water for precooling, and then manually taking them out after precooling, with ice cubes added from time to time. This ice water precooling method is difficult to ensure that the fruits and vegetables are precooled in time after picking, so the storage time of the fruits and vegetables is greatly affected. Summary of the invention

[0005] Therefore, the present application provides a fruit and vegetable precooling component, a fruit and vegetable precooling device and a precooling method, which can solve the problem in the prior art that it is difficult to precool fruits and vegetables in time after picking, which affects the storage time.

[0006] In order to solve the above problems, the present application provides a fruit and vegetable precooling component, comprising:

[0007] A mobile ice-making device comprises a vehicle body, a refrigeration assembly and a water tank, wherein the refrigeration assembly and the water tank are arranged on the vehicle body; a refrigeration part of the refrigeration assembly exchanges heat with water in the water tank so that the water in the water tank forms an ice-water mixed phase;

[0008] A first lifting platform and a fruit and vegetable frame, wherein the fruit and vegetable frame is placed on the first lifting platform; the first lifting platform can move up and down in a vertical direction; when the first lifting platform is lowered to the lowest point, the fruit and vegetable frame sinks into the water tank.

[0009] In some embodiments,

[0010] A first track in a vertical direction is provided on the side wall of the water tank, and one end of the first lifting platform is slidably arranged along the first track.

[0011] In some embodiments,

[0012] A second slide rail is provided on the wall surface of the side wall away from the water tank, and a second lifting platform is provided on the second slide rail in a sliding connection, and the second lifting platform can move up and down in a vertical direction; when the first lifting platform and the second lifting platform rise to the highest position at the same time, the two are on the same horizontal plane and flush with the top of the side wall.

[0013] In some embodiments,

[0014] A roller is provided on the top of the side wall; when the first lifting platform and the second lifting platform are simultaneously raised to the highest position, the fruit and vegetable frame can be moved to the first lifting platform or the second lifting platform through the roller.

[0015] In some embodiments,

[0016] The surfaces of the first lifting platform and the second lifting platform are both provided with roller structures.

[0017] In some embodiments,

[0018] The second lifting platform is provided with a weight measuring device for weighing the fruit and vegetable frame on the second lifting platform.

[0019] In some embodiments,

[0020] The refrigeration assembly includes a compressor, a condenser, a throttling device and a heat exchanger through which refrigerant circulates in sequence, and the refrigeration unit includes the heat exchanger; the water in the water tank is connected to the heat exchanger.

[0021] According to another aspect of the present application, a fruit and vegetable precooling device is provided, comprising the fruit and vegetable precooling assembly as described above.

[0022] According to another aspect of the present application, a fruit and vegetable precooling method is provided, wherein the fruit and vegetable precooling device as described above is used for precooling, and the fruit and vegetable precooling method comprises:

[0023] The fruit and vegetable frame containing fruits and vegetables is weighed when a weight measuring device is provided on the second lifting platform to determine the weight W of the fruits and vegetables;

[0024] Transferring the fruit and vegetable frame to the first lifting platform, and lowering the fruit and vegetable frame along with the first lifting platform until the frame is completely submerged in the water tank, recording the water level change of the water tank, and determining the volume of the fruit and vegetable frame;

[0025] Calculate the density of the fruits and vegetables according to their weight and volume, and determine the types of the fruits and vegetables and their specific heat capacity Cp according to the density; calculate the soaking time t of the fruits and vegetables according to the specific heat capacity;

[0026] After the fruit and vegetable frame is immersed in the water tank for a period of time of t, the pre-cooling is completed.

[0027] In some embodiments,

[0028] The soaking time t of the fruits and vegetables is calculated according to the specific heat capacity, including detecting the temperature T1 before the fruits and vegetables are soaked, confirming the temperature T2 to be reached after the fruits and vegetables are soaked, and calculating the soaking time t of the fruits and vegetables according to the following formula:

[0029] t=W*Cp*[T1-T2] / Q, where Q is the cooling rate of the ice water in the water tank.

[0030] The present application provides a fruit and vegetable pre-cooling component, comprising: a mobile ice-making device, comprising a vehicle body, a refrigeration component and a water tank, wherein the refrigeration component and the water tank are arranged on the vehicle body; the refrigeration part of the refrigeration component exchanges heat with the water in the water tank so that the water in the water tank forms an ice-water mixed phase; a first lifting platform and a fruit and vegetable frame, wherein the fruit and vegetable frame is placed on the first lifting platform; the first lifting platform can move up and down in a vertical direction; when the first lifting platform is lowered to the lowest point, the fruit and vegetable frame sinks into the water tank.

[0031] This application has the following beneficial effects:

[0032] By using a mobile ice-making device to produce ice water, the picked fruits and vegetables can be pre-cooled in time, thus extending the shelf life of the fruits and vegetables. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the implementation methods or the prior art descriptions. The drawings described below are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be derived from the provided drawings without creative work.

[0034] Figure 1 This is a schematic diagram of the structure of the fruit and vegetable precooling device in the first state of the embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the structure of the fruit and vegetable precooling device in the second state of the embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of the structure of the fruit and vegetable precooling device in the third state of the embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of the structure of the fruit and vegetable precooling device in the fourth state of the embodiment of the present application;

[0038] Figure 5 A top view of the fruit and vegetable precooling device according to an embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of the structure of a hydraulic cylinder according to an embodiment of the present application;

[0040] Figure 7 This is a flow chart of the fruit and vegetable precooling method according to an embodiment of the present application.

[0041] The reference numerals are as follows:

[0042] 1. Car body;

[0043] 100, refrigeration assembly; 101, condenser; 102, throttling device; 103, tubular heat exchanger; 104, compressor; 105, water pump; 106, filter;

[0044] 200, fruit and vegetable pre-cooling area; 201, first distance sensor; 202, first lifting platform; 203, roller; 204, water tank; 205, fruit and vegetable frame; 206, second distance sensor; 207, slide plate; 208, second lifting platform; 209, weight measuring device; 210, water level sensor; 211, temperature measuring device; 212, controller; 213, hydraulic cylinder. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0049] See also Figures 1 to 7 As shown, according to an embodiment of the present application, a fruit and vegetable precooling component includes:

[0050] The mobile ice-making device comprises a vehicle body 1, a refrigeration assembly 100 and a water tank 204, wherein the refrigeration assembly 100 and the water tank 204 are arranged on the vehicle body 1; the refrigeration part of the refrigeration assembly 100 exchanges heat with the water in the water tank 204, so that the water in the water tank 204 forms an ice-water mixed phase;

[0051] The first lifting platform 202 and the fruit and vegetable frame 205 , wherein the fruit and vegetable frame 205 is placed on the first lifting platform 202 ; the first lifting platform 202 can move up and down in the vertical direction; when the first lifting platform 202 is lowered to the lowest point, the fruit and vegetable frame 205 sinks into the water tank 204 .

[0052] The present application uses a mobile ice-making device to make ice water, which is convenient for timely pre-cooling of picked fruits and vegetables, and can extend the shelf life of fruits and vegetables.

[0053] like Figure 1As shown, a refrigeration component 100 and a fruit and vegetable pre-cooling area 200 are provided on the vehicle body 1. The refrigeration component 100 generates cold energy when in operation and performs heat exchange with the water in the water tank 204 to refrigerate the water and form an ice-water mixed phase. The fruit and vegetable pre-cooling area 200 includes a water tank 204 and a first lifting platform 202. A fruit and vegetable frame 205 can be placed on the first lifting platform 202, and the lifting method of the first lifting platform 202 allows the entire fruit and vegetable frame 205 to sink into the ice-water mixed phase to achieve pre-cooling of the fruits and vegetables.

[0054] After the pre-cooling treatment, the fruits and vegetables can be lifted up and out of the ice-water mixed phase by the first lifting platform 202, so as to be conveniently stored.

[0055] Since the refrigeration component 100 and the fruit and vegetable precooling area 200 are both arranged on the vehicle body 1, they can be moved to the fruit and vegetable harvesting site through the vehicle body 1 to precool the fruits and vegetables harvested on site in time, avoiding the time wasted in the traditional way of sending the fruits and vegetables after harvesting to fixed precooling equipment to complete soaking; during this period, the fruits and vegetables carry a large amount of field heat, have high respiration intensity, are prone to spoilage, and seriously affect their quality; relatively speaking, the fruit and vegetable precooling component of the present application can improve the quality of fruits and vegetables by precooling them in time in the field.

[0056] In some embodiments,

[0057] A first vertical track is disposed on the side wall of the water tank 204 , and one end of the first lifting platform 202 is slidably disposed along the first track.

[0058] The first lifting platform 202 is set up in a manner that one end slides on a first track (not shown in the figure) on the side wall of the water tank 204 to ensure the stability of the ascent and descent of the first lifting platform 202; the lifting and lowering of the first lifting platform 202 can be completed by a driving device, specifically a hydraulic cylinder 213 arranged on the vehicle body.

[0059] In some embodiments,

[0060] A second slide rail is provided on the wall surface of the side wall away from the water tank 204, and a second lifting platform 208 is slidably connected to the second slide rail. The second lifting platform 208 can move up and down in the vertical direction; when the first lifting platform 202 and the second lifting platform 208 rise to the highest position at the same time, the two are on the same horizontal plane and flush with the top of the side wall.

[0061] In order to facilitate the timely pre-cooling of fruits and vegetables harvested on site, since the water tank 204 is arranged on the vehicle body 1, the present application arranges a second slide rail and a sliding second lifting platform 208 on the outer side of the side wall of the water tank 204, so that the harvesting workers can place the collected fruit and vegetable frames 205 on the second lifting platform 208, and then when the second lifting platform 208 rises to the highest position, the first lifting platform 202 can also be raised to the highest position. At this time, the two lifting platforms and the top of the side wall are in a flush position, which is convenient for the fruit and vegetable frames 205 to be moved to the first lifting platform 202 for pre-cooling operations.

[0062] A second lifting platform 208 is arranged outside the water tank 204, so that it is convenient for the harvesting workers to place the fruit and vegetable frames 205, lowering the placement height of the fruit and vegetable frames 205 and reducing the labor intensity of the harvesting workers.

[0063] The lifting of the second lifting platform 208 can also be driven by the hydraulic cylinder 213.

[0064] In some embodiments,

[0065] A roller 203 is provided on the top of the side wall; when the first lifting platform 202 and the second lifting platform 208 rise to the highest position at the same time, the fruit and vegetable frame 205 can pass through the roller 203 and move to the first lifting platform 202 or the second lifting platform 208.

[0066] Since the side wall is arranged between the two lifting platforms, when the fruit and vegetable frame 205 moves on the top of the side wall, the wear of the top of the side wall on the fruit and vegetable frame 205 is reduced. Rollers are arranged on the top of the side wall. When the fruit and vegetable frame 205 moves, it can pass through the rollers, which reduces resistance and is easy to operate.

[0067] In some embodiments,

[0068] The surfaces of the first lifting platform 202 and the second lifting platform 208 are both configured as roller structures.

[0069] The table tops of the first lifting platform 202 and the second lifting platform 208 can also be set as roller structures, that is, rollers are set on the upper end surface of the fruit and vegetable frame 205, and multiple rollers form a table top to support the fruit and vegetable frame 205; the fruit and vegetable frame 205 can be easily moved, reducing labor intensity.

[0070] A slide plate 207 may also be provided below the bottom of the fruit and vegetable frame 205 to further reduce wear on the bottom of the fruit and vegetable frame 205 .

[0071] In some embodiments,

[0072] The second lifting platform 208 is provided with a weight measuring device 209 for weighing the fruit and vegetable frame 205 on the second lifting platform 208 .

[0073] A weight measuring device 209 is provided on the second lifting platform 208 to conveniently measure the weight of the fruit and vegetable frame 205, so as to count the total amount of harvested fruits and vegetables and facilitate subsequent identification of the types of fruits and vegetables.

[0074] To distinguish fruits and vegetables, their density can be used. Since the fruits and vegetables will be immersed in ice water in subsequent operations, their volume can be measured, so their density can be calculated and the type of fruits and vegetables can be determined based on their density.

[0075] In some embodiments,

[0076] The refrigeration assembly 100 includes a compressor 104, a condenser 101, a throttling device 102 and a heat exchanger through which a refrigerant flows in sequence, and the refrigeration unit includes the heat exchanger; the water in the water tank 204 is connected to the heat exchanger.

[0077] The refrigeration component 100 installed on the vehicle body can adopt a structure including a compressor 104, a condenser 101, a throttling device 102 and a heat exchanger in which a refrigerant circulates. After the compressed refrigerant dissipates heat in the condenser 101, it can absorb heat at the heat exchanger through the throttling device 102; the water in the water tank 204 exchanges heat with the heat exchange pipe, thereby realizing the cooling treatment of the water in the water tank 204.

[0078] In the specific configuration, the heat exchanger can be placed in the water tank 204 to directly cool the water in the water tank 204; the water in the water tank 204 can also be connected to the heat exchanger through a pipe, such as Figure 5 As shown, after the water tank 204 is connected to the filter 106 and the water pump 105, it is communicated with the heat exchanger to form a water cycle and realize a water cooling structure.

[0079] According to another aspect of the present application, a fruit and vegetable precooling device is provided, comprising the fruit and vegetable precooling assembly as described above.

[0080] According to another aspect of the present application, a fruit and vegetable precooling method is provided, wherein the fruit and vegetable precooling device as described above is used for precooling, and the fruit and vegetable precooling method comprises:

[0081] The fruit and vegetable frame 205 containing fruits and vegetables is weighed by a weight measuring device 209 provided on the second lifting platform 208 to determine the weight W of the fruits and vegetables;

[0082] The fruit and vegetable frame 205 is transferred to the first lifting platform 202, and is lowered along with the first lifting platform 202 until it is completely submerged in the water tank 204, and the water level change of the water tank 204 is recorded to determine the volume of the fruit and vegetables;

[0083] Calculate the density of the fruits and vegetables according to their weight and volume, and determine the types of the fruits and vegetables and their specific heat capacity Cp according to the density; calculate the soaking time t of the fruits and vegetables according to the specific heat capacity;

[0084] After the fruit and vegetable frame 205 is immersed in the water tank 204 for a period of time reaching t, the pre-cooling is completed.

[0085] The present application monitors the weight and volume of fruits and vegetables, obtains the weight and volume, and determines the density of the fruits and vegetables. Based on the density of the fruits and vegetables as their own characteristics, the types of fruits and vegetables can be judged according to conventional data, thereby determining the specific heat capacity of the fruits and vegetables, and then combining the required temperature to calculate the soaking time of the fruits and vegetables. Finally, the fruit and vegetable frame 205 completes the soaking pre-cooling treatment according to the soaking time.

[0086] The above process can be completed by the controller 212 arranged on the vehicle body 1, and the specific data can be changed through the operation panel.

[0087] This application can automatically judge the fruits and vegetables, determine the time for soaking in ice water, and ensure the pre-cooling effect is optimized and accurate. The entire pre-cooling process realizes automatic feeding and discharging without manual intervention, which greatly improves work efficiency.

[0088] In some embodiments,

[0089] The soaking time t of the fruits and vegetables is calculated according to the specific heat capacity, including detecting the temperature T1 before the fruits and vegetables are soaked, confirming the temperature T2 to be reached after the fruits and vegetables are soaked, and calculating the soaking time t of the fruits and vegetables according to the following formula:

[0090] t=W*Cp*[T1-T2] / Q, where Q is the cooling rate of the ice water in the water tank.

[0091] For calculating the time for fruits and vegetables to be immersed in ice water using the specific heat capacity of fruits and vegetables, the immersion time can be calculated according to the provided formula by detecting the temperature of the fruits and vegetables before immersion and the temperature to be immersed, so as to achieve the best immersion effect.

[0092] The fruit and vegetable precooling device of the present application can automatically make ice, automatically identify fruits and vegetables, and complete the precooling operation of fruits and vegetables, thereby reducing labor costs and making the overall operation more economical and efficient. The refrigeration assembly 100 and the fruit and vegetable precooling area 200 are arranged on the vehicle body, which can be moved in different directions and can be flexibly applied to different picking sites and adapt to various working environments.

[0093] Traditional immersion precooling equipment is usually fixed in a certain location and lacks mobility, which makes it impossible to precool fruits and vegetables immediately after harvest. This inevitably affects the freshness and storage time of fruits and vegetables, and also increases transportation costs. In addition, the precooling process requires manual handling, immersion, and salvage, as well as manual calculation of precooling time and temperature measurement, which is not only labor-intensive, but also significantly increases labor costs.

[0094] The fruit and vegetable precooling device of the present application can follow the harvesting workers into the field to work during the precooling operation.

[0095] 1. The water level sensor 210 records the initial water level H (initial), and sets the fruit and vegetable precooling temperature T (set) at the same time. The refrigeration component 100 starts to operate, so that the cooling water used for precooling reaches an ice water state.

[0096] 2. The picked fruits and vegetables can be placed on the slide plate 207 of the second lifting platform 208. After the second lifting platform 208 is filled with fruits and vegetables, the weight measuring device 209 measures the weight of the fruits and vegetables: W (measured). At the same time, the temperature measuring device 211 measures the initial temperature T1 of the fruits and vegetables.

[0097] 3. After the framing step is completed, the second lifting platform 208 rises to the same height as the first lifting platform 202, and then is transported to the first lifting platform 202 by rollers. When the first distance sensor 201 on the first lifting platform 202 senses the slide plate 207, the first lifting platform 202 can be controlled to descend to be completely immersed.

[0098] A second distance sensor 206 is also provided on the second lifting platform 208 . After precooling is completed, when the fruit and vegetable frame 205 moves from the first lifting platform 202 to the second lifting platform 208 , the second distance sensor 206 performs monitoring.

[0099] 4. The water level sensor 210 records the digital height H(measured) of the fruits and vegetables after they are soaked in water, and the controller 212 can calculate the drainage volume of the fruits and vegetables. The density of the fruits and vegetables ρ(fruits and vegetables) is calculated by the drainage volume (i.e. the volume of the fruits and vegetables themselves), and the types of fruits and vegetables are determined to obtain the specific heat capacity Cp of the fruits and vegetables.

[0100] ρ(fruits and vegetables) = [W(measured) - W(fruit and vegetable basket)] / [A(bottom area of ​​water tank) * (H(measured) - H(initial)) - V(volume of fruit and vegetable basket)]

[0101] 5. Calculate the time t required for precooling fruits and vegetables by specific heat capacity.

[0102] t=[W(measured)-W(fruit and vegetable basket)]*Cp*[T1-T2] / Q

[0103] Among them, T2 is the temperature that fruits and vegetables need to reach after soaking; Q is the cooling rate of ice water.

[0104] 6. After the soaking time reaches t, the pre-cooling is determined to be completed, and the fruit and vegetable baskets are lowered with the lifting platform to a height suitable for workers to operate, and then carried away by the workers to complete the pre-cooling of fruits and vegetables.

[0105] During this time, the refrigeration component will perform cooling work, the water pump will provide power for the water circulation in the water tank, and the filter will ensure the cleanliness of the water in the water tank and ensure the service life of the refrigeration equipment.

[0106] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0107] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A fruit and vegetable precooling component, characterized in that: include: A mobile ice-making device comprises a vehicle body (1), a refrigeration assembly (100) and a water tank (204); the refrigeration assembly (100) and the water tank (204) are arranged on the vehicle body (1); a refrigeration part of the refrigeration assembly (100) exchanges heat with water in the water tank (204), so that the water in the water tank (204) forms an ice-water mixed phase; A first lifting platform (202) and a fruit and vegetable frame (205), wherein the fruit and vegetable frame (205) is placed on the first lifting platform (202); the first lifting platform (202) can move upward and downward in a vertical direction; when the first lifting platform (202) is lowered to the lowest point, the fruit and vegetable frame (205) sinks into the water tank (204).

2. The fruit and vegetable precooling assembly according to claim 1, characterized in that: A first track in a vertical direction is provided on the side wall of the water tank (204), and one end of the first lifting platform (202) is slidably arranged along the first track.

3. The fruit and vegetable precooling assembly according to claim 2, characterized in that: A second slide rail is provided on the wall surface of the side wall away from the water tank (204), and a second lifting platform (208) is slidably connected to the second slide rail. The second lifting platform (208) can move up and down in a vertical direction; when the first lifting platform (202) and the second lifting platform (208) are simultaneously raised to the highest position, the two are on the same horizontal plane and are flush with the top of the side wall.

4. The fruit and vegetable precooling assembly according to claim 3, characterized in that: A roller (203) is provided on the top of the side wall; when the first lifting platform (202) and the second lifting platform (208) are simultaneously raised to the highest position, the fruit and vegetable frame (205) can pass through the roller (203) and move onto the first lifting platform (202) or the second lifting platform (208).

5. The fruit and vegetable precooling assembly according to claim 4, characterized in that: The surfaces of the first lifting platform (202) and the second lifting platform (208) are both configured as roller structures.

6. The fruit and vegetable precooling assembly according to claim 4 or 5, characterized in that: The second lifting platform (208) is provided with a weight measuring device (209) for weighing the fruit and vegetable frame (205) on the second lifting platform (208).

7. The fruit and vegetable precooling assembly according to claim 1, characterized in that: The refrigeration component (100) comprises a compressor (104), a condenser (101), a throttling device (102) and a heat exchanger through which a refrigerant circulates in sequence, and the refrigeration unit comprises the heat exchanger; the water in the water tank (204) is connected to the heat exchanger.

8. A fruit and vegetable precooling device, characterized in that: It comprises the fruit and vegetable precooling component as described in any one of claims 1 to 7.

9. A method for precooling fruits and vegetables, characterized in that: The fruit and vegetable precooling device according to claim 8 is used for precooling, and the fruit and vegetable precooling method comprises: The fruit and vegetable frame (205) containing fruits and vegetables is weighed when a weight measuring device (209) is provided on the second lifting platform (208) to determine the weight W of the fruits and vegetables; The fruit and vegetable frame (205) is transferred to the first lifting platform (202), and is lowered along with the first lifting platform (202) until it is completely submerged in the water tank (204), and the water level change of the water tank (204) is recorded to determine the volume of the fruit and vegetables; Calculate the density of the fruits and vegetables according to their weight and volume, and determine the types of the fruits and vegetables and their specific heat capacity Cp according to the density; calculate the soaking time t of the fruits and vegetables according to the specific heat capacity; After the fruit and vegetable frame (205) has been immersed in the water tank (204) for a period of time t, precooling is completed.

10. The method for precooling fruits and vegetables according to claim 9, characterized in that: The soaking time t of the fruits and vegetables is calculated according to the specific heat capacity, including detecting the temperature T1 before the fruits and vegetables are soaked, confirming the temperature T2 to be reached after the fruits and vegetables are soaked, and calculating the soaking time t of the fruits and vegetables according to the following formula: t=W*Cp*[T1-T2] / Q, wherein Q is the cooling rate of the ice water in the water tank (204).

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