Mesh belt type hot air internal circulation fruit and vegetable drying system

Abstract

The invention relates to the field of fruit and vegetable drying, and particularly discloses a mesh belt type hot air internal circulation fruit and vegetable drying system, which comprises a drying box, a plurality of parallel conveying mesh belts, a plurality of hot air circulation devices, a plurality of hot air circulation devices and a control device, the dehumidifying channel is used for sucking moisture at the top of the drying box; the circulating channel is used for sending hot air at the top of the drying box back to the bottom; the hot air channel communicates with the circulation channel to convey hot air, and the drying device further comprises a discharging part and an air closing discharging mechanism which are arranged on one side of the drying box. According to the fruit and vegetable drying device, dried fruits and vegetables can fall into the elastic frame along the opening, then when the discharging wheel rotates and conveys the elastic frame containing materials to the junction of the opening, the elastic frame can deform and expand, so that the internal capacity of the elastic frame is increased, and when the inner wall of the arc frame and the discharging wheel are staggered, the situation that overflowing fruits and vegetables are cut off is reduced; in addition, the materials are wrapped in the mode, the drying box can be prevented from being communicated with the outside, and loss of hot air in the drying box is reduced.

Description

Technical Field

[0001] This invention relates to fruit and vegetable drying technology, specifically a mesh belt hot air internal circulation fruit and vegetable drying system. Background Technology

[0002] As is generally known, fruit and vegetable drying, also known as fruit and vegetable dehydration, involves removing water from fresh fruits and vegetables, thereby extending their shelf life and concentrating their flavor and nutrients. Belt dryers can continuously dry processed fruits and vegetables, making them suitable for industrial production.

[0003] For example, the invention patent with application publication number CN219069331U, application publication date May 26, 2023, entitled "A Mesh Belt Continuous Air Source Heat Pump Fruit and Vegetable Dryer," includes a drying chamber and several drying components disposed within the drying chamber. These drying components are connected to an air source heat pump. The drying components are evenly distributed vertically along the drying chamber, with a discharge port between the end of each component in the transport direction and the drying chamber. Each drying component includes a mesh belt conveyor belt, with closed plates fixed to the drying chamber on both sides along its width. A hot air chamber is formed between the closed plates on both sides. Several hot air pipes connected to the hot air chamber are fixedly connected to the closed plates and are connected to the air source heat pump. This invention has a simple structure; by using a mesh belt conveyor belt and closed plates to form a hot air chamber, hot air is concentrated and directed towards the fruits and vegetables, improving the drying efficiency.

[0004] The shortcoming of the existing technology is that when the continuous mesh belt dryer dries fruits and vegetables, it adopts a circulation mode to circulate the heat flow in the dryer. During the circulation process, the water vapor in the fruits and vegetables is carried out to complete the drying. There is a discharge roller at the bottom of the mesh belt dryer to discharge the dried fruits and vegetables out of the dryer. However, the discharge process is continuous, which causes some heat flow to be carried out with it during the discharge process, resulting in a reduction in thermal efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a mesh belt hot air internal circulation fruit and vegetable drying system to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mesh belt type hot air internal circulation fruit and vegetable drying system, comprising a drying box, on which are respectively provided:

[0007] Several parallel conveyor belts are used to transport fruits and vegetables;

[0008] A dehumidification channel is used to draw moisture from the top of the drying chamber;

[0009] A circulation channel is used to return hot air from the top of the drying chamber to the bottom.

[0010] The hot air channel is communicated with the circulating channel to convey hot air, and further comprises a discharging part and a closed air discharging mechanism arranged on one side of the drying box.

[0011] The circular arc frame is arranged on the discharging part and has two openings.

[0012] The discharging wheel abuts against the circular arc frame, and the elastic frame is arranged on the discharging wheel in a circumferential array and expands at the junction of the openings.

[0013] As a further description of the above technical solution, a plurality of partition plates are arranged on the discharging wheel in a circumferential array, the partition plates and the elastic frame are arranged alternately, and the partition plates and the inner wall of the circular arc frame are slidingly connected.

[0014] As a further description of the above technical solution, the partition plates are rotationally connected to the discharging wheel, and the partition plates on both sides of the elastic frame move towards each other at the junction of the openings.

[0015] As a further description of the above technical solution, a cam ring is arranged on the discharging part, an extension column is arranged at the bottom of the elastic frame, the extension column moves along the inner wall of the cam ring to expand the elastic frame.

[0016] As a further description of the above technical solution, a guide groove accommodating the extension column is formed in the discharging wheel, and the extension column pushes the partition plate along the guide groove to overturn the partition plate.

[0017] As a further description of the above technical solution, the conveying mesh belt comprises a transmission shaft and vertical bars arranged on the transmission shaft in a linear array, a plurality of horizontal bars are arranged on the vertical bars, the horizontal bars are provided with material guiding slopes, and the drying box is provided with uniform material rollers corresponding to the horizontal bars.

[0018] As a further description of the above technical solution, side channels are symmetrically arranged on the circulating channel, and air suction side plates are arranged on the side channels in a linear array.

[0019] As a further description of the above technical solution, one end of the horizontal bar is hinged to the vertical bar, and material guiding slopes are formed on both sides of the horizontal bar to guide the diffusion of hot air towards the material guiding slopes in the conveying mesh belt.

[0020] As a further description of the above technical solution, inclined surfaces are formed on the vertical bars, and the inclined surfaces on a plurality of vertical bars are in a “V” shape along a center line.

[0021] As a further description of the above technical solution: the other end of the horizontal strip is hingedly connected with a link strip, and the link strip is slidingly connected in a sliding groove formed in the vertical strip.

[0022] In the above technical solution, the fruit and vegetable drying system provided by the present application has the following beneficial effects: the dried fruits and vegetables will fall into the elastic frame through the opening, and then the discharge wheel will rotate and transport the elastic frame containing the materials to the opening junction (i.e. when it is about to enter the inner wall of the circular arc frame), the elastic frame will be deformed and expanded, thereby increasing the capacity of the elastic frame, and when the inner wall of the circular arc frame and the discharge wheel are staggered, the situation of cutting off the overflowing fruits and vegetables is reduced, the fruits and vegetables are less broken, and the material is wrapped in this way, which can avoid the communication between the drying box and the outside and reduce the heat loss in the drying box. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0024] Figure 1 The overall structure schematic diagram provided by the embodiment of the present application is shown in the figure;

[0025] Figure 2 The explosion schematic diagram of the hot gas pipeline structure provided by the embodiment of the present application is shown in the figure;

[0026] Figure 3 The internal structure schematic diagram of the drying box provided by the embodiment of the present application is shown in the figure;

[0027] Figure 4 The overall structure cross-sectional schematic diagram provided by the embodiment of the present application is shown in the figure;

[0028] Figure 5 The conveying belt surface structure schematic diagram provided by the embodiment of the present application is shown in the figure;

[0029] Figure 6 The Figure 5 The enlarged schematic diagram of A in the figure is shown in the figure;

[0030] Figure 7 The explosion schematic diagram of the conveying belt surface structure provided by the embodiment of the present application is shown in the figure;

[0031] Figure 8 The closed gas discharging mechanism structure cross-sectional schematic diagram provided by the embodiment of the present application is shown in the figure;

[0032] Figure 9 The overall structure cross-sectional schematic diagram provided by the embodiment of the present application is shown in the figure;

[0033] Figure 10For Figure 9 Enlarged view at B;

[0034] Figure 11 Cross-sectional view of the surface structure of the conveyor belt provided by the embodiment of the present application;

[0035] Figure 12 For Figure 11 Enlarged view at C;

[0036] Figure 13 Another direction cross-sectional view of the surface structure of the conveyor belt provided by the embodiment of the present application;

[0037] Figure 14 Explosive view of the closed gas blanking mechanism structure provided by the embodiment of the present application;

[0038] Figure 15 For Figure 14 Enlarged view at D.

[0039] Explanation of reference signs:

[0040] 1, drying box; 11, blanking part; 111, circular arc frame; 12, feeding hopper; 2, dehumidification channel; 3, circulation channel; 32, side channel; 321, air extraction side plate; 33, bottom air outlet; 4, mixing channel; 5, hot air channel; 6, conveying mesh belt; 61, transmission shaft; 611, vertical groove; 601, vertical bar; 6011, inclined groove angle; 6012, chute; 602, horizontal bar; 6021, material guiding slope; 603, linking bar; 63, material uniformizing roller; 7, closed gas blanking mechanism; 71, material discharging wheel; 711, guide groove; 72, elastic frame; 721, extension column; 73, partition plate; 74, cam ring. DETAILED DESCRIPTION

[0041] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0042] Please refer to Figures 1-15 , the embodiment of the present application provides a technical solution: a mesh belt type hot air internal circulation fruit and vegetable drying system, which comprises a drying box 1, the drying box 1 is built by a plate material, a plurality of parallel conveying mesh belts 6 are arranged in the drying box 1, the conveying mesh belt 6 is like Figure 9As shown, the drying chamber 1 is alternately arranged with a feeding hopper 12 at one end of its top and a discharging section 11 at the other end of its bottom for continuous operation of fruits and vegetables. A dehumidification channel 2 is located at the top of the drying chamber 1, connected to a dehumidifier. The dehumidification channel 2 is connected to the top of the drying chamber 1 via multiple pipes, continuously sucking away air from the top of the drying chamber 1 during operation. A circulation channel 3 is also fixedly connected to the top of the drying chamber 1, alternating with the dehumidification channel 2. A circulating fan is installed in the circulation channel 3 to extract hot air from the top. A mixing channel 4 is located at the outlet of the circulating fan in the circulation channel 3, and a hot air channel 5 is fixedly connected to the mixing channel 4. The mixing channel 4 mixes the circulating hot air from the circulation channel 3 with the hot air from the hot air channel 5. A bottom air outlet 33 is installed in the mixing channel 4, sending the mixed hot air back to the bottom of the drying chamber 1 for recirculation. A discharging section 11 is located on one side of the drying chamber 1 (e.g., Figure 2 As shown (one side is the left side), an air-tight feeding mechanism 7 is provided on the feeding part 11. The air-tight feeding mechanism 7 includes an arc frame 111 disposed on the feeding part 11. The arc frame 111 is as follows: Figure 10 As shown, the drying chamber 111 has two openings, one at the top and one at the bottom. A discharge wheel 71 that fits the inner wall of the circular frame 111 is provided. Elastic frames 72 are arranged in a circular array on the discharge wheel 71. During continuous feeding, the dried fruits and vegetables fall into the elastic frames 72 through the openings. Then, when the discharge wheel 71 rotates and transports the elastic frames 72 containing the material to the junction of the openings (that is, when they are about to enter the inner wall of the circular frame 111), the elastic frames 72 will deform and expand, thereby increasing the internal capacity of the elastic frames 72. When the inner wall of the circular frame 111 and the discharge wheel 71 intersect, the occurrence of cutting off the overflowing fruits and vegetables is reduced, and the fruits and vegetables are less likely to break. In this way, the material is wrapped to prevent the drying chamber 1 from communicating with the outside world and to reduce the loss of heat in the drying chamber 1.

[0043] Preferred, such as Figure 10 As shown, multiple partition plates 73 are arranged in a circular array on the discharge wheel 71. The partition plates 73 and the elastic frame 72 are arranged alternately. The partition plates 73 are used to separate the elastic frame 72. The partition plates 73 are slidably connected to the inner wall of the arc frame 111, so that when the discharge wheel 71 rotates, the partition plates 73 and the inner wall of the arc frame 111 slide together to block the fruits and vegetables.

[0044] Preferably, the feeding part 11 is provided with a cam ring 74, which is fixedly set. The bottom of the elastic frame 72 is provided with an extension column 721. The extension column 721 slides along the inner wall of the cam ring 74. When the discharge wheel 71 is flipped, the extension column 721 will slide along the inner wall of the cam ring 74. The cam ring 74 has a small diameter area. In this area, the cam ring 74 restricts the extension column 721 to move closer to the center, so that the elastic frame 72 is pulled to complete the expansion. The elastic frame 72 is made of silicone, which is relatively soft and can further reduce the occurrence of fruit and vegetable breakage.

[0045] In another embodiment of the present invention, the partition plate 73 is rotatably connected to the discharge wheel 71 and can flip along the discharge wheel 71. When the discharge wheel 71 rotates and the dried fruits and vegetables are placed in the elastic frame 72, as the rotation moves toward the opening junction, the partition plates 73 on both sides will flip as the elastic frame 72 gradually deforms and expands, and flip toward the center line of the elastic frame 72, so as to reduce the opening at the elastic frame 72, reduce the amount of fruits and vegetables entering the elastic frame 72 at the junction, and reduce fruit and vegetable breakage in conjunction with the expanding elastic frame 72.

[0046] Preferably, the discharge wheel 71 is provided with a guide groove 711 for accommodating the extension column 721, the guide groove 711 as follows: Figure 15 As shown, it is V-shaped. When the cam ring 74 restricts the extension column 721 to move closer to the center, the extension column 721 will move along the guide groove 711 and move closer to the lower position of the V-shape to increase the amplitude of the expansion elastic frame 72. At the same time, the extension column 721 will push against the partition plate 73, causing the partition plate 73 to flip and reduce the opening of the partition plate 73.

[0047] In another embodiment provided by the present invention, such as Figure 5 and Figure 7 As shown, the conveyor belt 6 includes a drive shaft 61 and vertical bars 601 arranged in a linear array on the drive shaft 61. Vertical grooves 611 are provided on the drive shaft 61 to restrict the vertical bars 601. Horizontal bars 602 are covered on several vertical bars 601. The horizontal bars 602 and vertical bars 601 form a grid to support the fruits and vegetables. A part of the drive shaft 61 extends out of the drying chamber 1 and is connected to the motor output end for driving. A feeding ramp 6021 is provided on the horizontal bars 602. A leveling roller 63 corresponding to the horizontal bars 602 is provided in the drying chamber 1. When feeding is carried out in the feeding hopper 12, the fruits and vegetables tend to accumulate in the center of the belt surface. At this time, the feeding ramp 6021 and the leveling roller 63 flatten the fruits and vegetables accumulated in the center, improving the drying efficiency.

[0048] Preferably, one end of the horizontal bar 602 is hinged to the vertical bar 601. When passing the arc of the conveyor belt 6 (the arc is the alternating upper and lower side surface), the horizontal bar 602 will flip to assist in the feeding of fruits and vegetables. Both sides of the horizontal bar 602 are provided with feeding ramps 6021. When the hot air rises, the hot air will be guided along the feeding ramps 6021 at the lower end of the horizontal bar 602 and diffused laterally, so that the fruits and vegetables at the edge can also be affected by the hot air and dried, increasing the thermal efficiency. In addition, due to the design of the feeding ramps 6021 at the lower end of the horizontal bar 602, a cavity is formed in the horizontal bar 602 for the diffusion of hot air.

[0049] In another embodiment provided by the present invention, such as Figure 2 and Figure 9 As shown, symmetrical side channels 32 are arranged on the circulation channel 3, extending into the drying chamber 1. A linear array of exhaust side plates 321 are arranged on the side channels 32. The exhaust volume of the exhaust side plates 321 increases in a stepped manner, with the lower exhaust side plate 321 having the smallest exhaust volume and the upper exhaust side plate 321 having the largest exhaust volume. The exhaust side plates 321 are positioned between the conveyor belts 6. Because the hot air is guided to both sides by the feed ramp 6021 at the lower end of the crossbar 602, some of the hot air is drawn in advance by the side channels 32 and enters the circulation earlier. Meanwhile, the new hot air is output from the bottom of the drying chamber 1, resulting in a stepped decrease in temperature from bottom to top within the drying chamber 1. This creates a temperature difference in the conveyor belt 6, achieving a gradual heating and dehydration method that prevents premature hardening of the outer shell and better preserves the color and nutrients of fruits and vegetables sensitive to non-enzymatic browning (such as carrots and bananas).

[0050] Preferred, such as Figure 13 As shown, inclined surfaces are provided on the vertical bars 601, and the inclined surfaces on several vertical bars 601 form a "V" shape along the center line, which increases the flow of hot air moving along the horizontal bars 602 and enhances the temperature difference of the conveyor belt 6.

[0051] In another embodiment provided by the present invention, such as Figure 12 As shown, a slanted groove 6011 is provided on the vertical bar 601. The slanted groove 6011 is used to form a depression on the belt surface to reduce the adhesion surface of fruits and vegetables containing sugar when they condense during drying. A connecting strip 603 is hinged to the other end of the horizontal bar 602. The connecting strip 603 is slidably connected in the groove 6012 opened on the vertical bar 601. When the upper horizontal bar 602 reaches the lower end as the conveyor belt 6 moves, the horizontal bar 602 flips open and is restricted to an inclined state by the connecting strip 603, reducing the obstruction of the rising airflow at this point, so that the airflow can enter the upper layer in time to dry the fruits and vegetables. Because the moving speed of the conveyor belt 6 is relatively slow, the interference with the airflow is small when moving in an inclined state.

[0052] During operation, fruits and vegetables are fed into the feed hopper 12 via the conveyor belt and begin to move slowly into the conveyor belt 6. At this time, the bottom air outlet 33 sends the mixed hot air into the bottom of the drying chamber 1. The hot air at the bottom rises and first passes over the open horizontal bar 602. As it continues to rise, it is guided and diffused by the "V" shape of the vertical bar 601 and the feeding ramp 6021 at the lower end of the horizontal bar 602, spreading out on the belt surface. The feeding ramp 6021 and the equalizing roller 63 flatten the fruits and vegetables piled in the center for drying. At this time, some of the hot air continues to rise, while a small portion of the hot air is drawn away by the exhaust side plate 321 after horizontal diffusion and enters the airflow circulation in advance, forming... Due to temperature differences, during the feeding process, the dried fruits and vegetables fall into the elastic frame 72 through the opening. Then, the discharge wheel 71 rotates and transports the elastic frame 72 to the opening boundary. The cam ring 74 restricts the extension column 721 to move closer to the center, causing the elastic frame 72 to be pulled to complete the expansion. At the same time, the extension column 721 moves along the guide groove 711 and moves closer to the lower position of the "V" shape to increase the expansion of the elastic frame 72. Meanwhile, the extension column 721 pushes against the partition plate 73, causing the partition plate 73 to flip. During this process, the drying box 1 is prevented from communicating with the outside world, reducing the loss of heat in the drying box 1, and reducing the occurrence of cutting the overflowing fruits and vegetables, thus reducing fruit and vegetable breakage.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mesh belt type hot air internal circulation fruit and vegetable drying system, comprising a drying box (1), on which are respectively provided: Several parallel conveyor belts (6) are used to transport fruits and vegetables; Dehumidification channel (2) is used to draw out moisture from the top of the drying box (1); The circulation channel (3) is used to return the hot air from the top of the drying box (1) to the bottom; A hot air passage (5), which is connected to the circulation passage (3) to transport hot air, is characterized in that... It also includes a feeding section (11) and an air-tight feeding mechanism (7) disposed on one side of the drying chamber (1), the air-tight feeding mechanism (7) comprising: An arc frame (111) is provided on the blanking part (11) and has two openings; The discharge wheel (71) matches the arc frame (111), and the discharge wheel (71) is provided with elastic frames (72) arranged in a circular array. The elastic frames (72) expand at the junction of the opening as the discharge wheel (71) rotates.

2. The mesh belt hot air internal circulation fruit and vegetable drying system according to claim 1, characterized in that, The discharge wheel (71) is provided with a plurality of partition plates (73) arranged in a circular array. The partition plates (73) and the elastic frame (72) are arranged alternately. The partition plates (73) and the inner wall of the arc frame (111) are slidably connected.

3. The mesh belt hot air internal circulation fruit and vegetable drying system according to claim 2, characterized in that, The partition plate (73) is rotatably connected to the discharge wheel (71), and the partition plates (73) on both sides of the elastic frame (72) move closer to each other toward the opening junction as the elastic frame (72) moves toward the opening junction.

4. The mesh belt hot air internal circulation fruit and vegetable drying system according to claim 3, characterized in that, The feeding part (11) is provided with a cam ring (74), and the bottom of the elastic frame (72) is provided with an extension column (721). The extension column (721) moves along the inner wall of the cam ring (74) to expand the elastic frame (72).

5. A mesh belt hot air internal circulation fruit and vegetable drying system according to claim 4, characterized in that, The discharge wheel (71) is provided with a guide groove (711) for accommodating the extension column (721). The extension column (721) pushes against the partition plate (73) along the guide groove (711), causing the partition plate (73) to flip.

6. The mesh belt hot air internal circulation fruit and vegetable drying system according to claim 1, characterized in that, The conveyor belt (6) includes a drive shaft (61) and vertical strips (601) arranged in a linear array on the drive shaft (61). A number of vertical strips (601) are covered with horizontal strips (602). A feeding ramp (6021) is provided on the horizontal strips (602). A material distribution roller (63) corresponding to the horizontal strips (602) is provided in the drying box (1).

7. A mesh belt hot air internal circulation fruit and vegetable drying system according to claim 1, characterized in that, The circulation channel (3) is symmetrically provided with side channels (32), and the side channels (32) are provided with exhaust side plates (321) in a linear array, and the exhaust side plates (321) are arranged between the conveyor belts (6).

8. A mesh belt hot air internal circulation fruit and vegetable drying system according to claim 6, characterized in that, One end of the horizontal bar (602) is hinged to the vertical bar (601), and both sides of the horizontal bar (602) are provided with material guiding ramps (6021) to guide the diffusion of hot air towards the material guiding ramps (6021) in the conveyor belt (6).

9. A mesh belt hot air internal circulation fruit and vegetable drying system according to claim 6, characterized in that, The vertical strip (601) has an inclined surface, and the inclined surface on several of the vertical strips (601) is V-shaped along the center line.

10. A mesh belt hot air internal circulation fruit and vegetable drying system according to claim 8, characterized in that, The other end of the horizontal bar (602) is hinged to a connecting bar (603), which is slidably connected to a groove (6012) opened on the vertical bar (601).

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