阅读说明：本技术 果蔬烘干装置 (Fruit and vegetable drying device ) 是由 廖斌 于 2020-07-27 设计创作，主要内容包括：本发明涉及一种果蔬烘干装置,包括烘箱、进料口、出料口、排湿风机、热风机、果蔬输送平台、支撑架、果蔬烘干单元以及烘干单元支架；烘箱上设置有进料口以及出料口；果蔬输送平台、果蔬烘干单元以及烘干单元支架均置于烘箱内部；果蔬烘干单元设置在烘干单元支架上；果蔬输送平台将经由进料口进入烘箱内部的待烘干的果蔬运输至果蔬烘干单元上；烘干单元支架的上表面是非平面；果蔬烘干单元是可移动的；热风机与烘箱内部相贯通并向果蔬烘干单元提供热风；排湿风机与烘箱内部相贯通并从烘箱内部抽取湿气。本发明可避免对果蔬内部的结构的破坏、保留了果蔬内部的营养、烘干效果稳定、烘干品质好以及可广泛用于果蔬热风烘干领域。(The invention relates to a fruit and vegetable drying device which comprises an oven, a feeding hole, a discharging hole, a moisture exhausting fan, an air heater, a fruit and vegetable conveying platform, a supporting frame, a fruit and vegetable drying unit and a drying unit support, wherein the drying unit support is arranged on the oven; a feed inlet and a discharge outlet are arranged on the oven; the fruit and vegetable conveying platform, the fruit and vegetable drying unit and the drying unit bracket are all arranged in the oven; the fruit and vegetable drying unit is arranged on the drying unit bracket; the fruit and vegetable conveying platform conveys the fruits and vegetables to be dried, which enter the oven through the feeding hole, to the fruit and vegetable drying unit; the upper surface of the drying unit bracket is non-planar; the fruit and vegetable drying unit is movable; the hot air blower is communicated with the inside of the drying oven and provides hot air for the fruit and vegetable drying unit; the moisture exhaust fan is communicated with the inside of the oven and extracts moisture from the inside of the oven. The invention can avoid the damage to the internal structure of the fruits and the vegetables, keeps the internal nutrition of the fruits and the vegetables, has stable drying effect and good drying quality, and can be widely applied to the field of hot air drying of the fruits and the vegetables.)

1. The utility model provides a fruit vegetables drying device which characterized in that: the fruit and vegetable drying device comprises an oven (1), a feeding hole (2), a discharging hole (3), a moisture exhausting fan (4), an air heater (5), a fruit and vegetable conveying platform (6), a support frame (11), a fruit and vegetable drying unit (64) and a drying unit support (66); the oven (1) is provided with a feeding hole (2) and a discharging hole (3); the fruit and vegetable conveying platform (6), the fruit and vegetable drying unit (64) and the drying unit bracket (66) are all arranged in the oven (1); the fruit and vegetable drying unit (64) is arranged on the drying unit bracket (66); the feed inlet (2) faces the fruit and vegetable conveying platform (6); the fruit and vegetable conveying platform (6) conveys the fruits and vegetables to be dried, which enter the oven (1) through the feeding hole (2), to the fruit and vegetable drying unit (64); the upper surface of the drying unit bracket (66) is non-planar; the fruit and vegetable drying unit (64) is movable; the hot air heater (5) is communicated with the inside of the oven (1) and provides hot air for the fruit and vegetable drying unit (64); the fruit and vegetable drying unit (64) conveys the dried fruits and vegetables on the fruit and vegetable drying unit to the discharge hole (3); the moisture exhaust fan (4) is communicated with the inside of the oven (1) and extracts moisture from the inside of the oven (1).

2. The fruit and vegetable drying device according to claim 1, characterized in that: the fruit and vegetable drying unit (64) at least comprises a first fruit and vegetable drying unit and a second fruit and vegetable drying unit which are sequentially arranged from top to bottom; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit have the same structure; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are respectively arranged in the oven (1) through drying unit brackets (66); the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are both parallel to the bottom of the oven (1); the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are opposite in movement direction; the fruit and vegetable conveying platform (6) conveys the fruits and vegetables to be dried, which enter the oven (1) through the feeding hole (2), to the first fruit and vegetable drying unit; the first fruit and vegetable drying unit transports the fruits and vegetables to be dried on the first fruit and vegetable drying unit to a second fruit and vegetable drying unit; the second fruit and vegetable drying unit conveys the dried fruits and vegetables on the second fruit and vegetable drying unit to a discharge hole (3).

3. The fruit and vegetable drying device according to claim 2, characterized in that: the upper surface of the drying unit bracket (66) is a chute (69); the fruit and vegetable drying unit (64) is arranged on the chute (69) and moves along the length direction of the chute (69); a drainage groove (70) communicated with the chute (69) is formed in the bottom of the oven (1); the hot air blower (5) provides hot air for the fruit and vegetable drying unit (64) through a chute (69) of the drying unit bracket (66).

4. The fruit and vegetable drying device according to claim 3, characterized in that: the chute (69) comprises a chute curved surface (71), a vent hole (72), an annular bulge (73) and a conveying pipeline (74); a conveying pipeline (74) communicated with the drainage groove (70) is arranged at a low-lying position of the chute curved surface (71); the chute curved surface (71) is provided with a vent hole (72) communicated with the air heater (5); the vent holes (72) are outwards provided with flanges, and the flanges wrap the vent holes (72) and form annular bulges (73); the vent hole (72) is one or more; the hot air blower (5) provides hot air for the fruit and vegetable drying unit (64) through the vent holes (72) on the chute curved surface (71).

5. The fruit and vegetable drying device according to claim 4, wherein: the length of the chute curved surface (71) along the advancing direction of the fruits and vegetables to be dried is x₀Width of y₀The maximum thickness of the drying unit support (64) is z₀And the point m (x, y, z) is any point on the chute curved surface (71), and the coordinate of the point m (x, y, z) satisfies the following condition:

wherein x is₀、y₀And z₀Satisfies the following relationship: 100z₀＜x₀≤200z₀，50z₀＜y₀≤100z₀；

The coordinates of the depression of the chute curved surface (71) are

6. The fruit and vegetable drying device according to claim 2, characterized in that: the drying unit support (66) comprises a metal net or a metal frame (79), a fiber layer (80) and a flow guide head (81); the metal net or the metal frame (79) is integrally wedge-shaped, and an included angle is formed between the upper surface of the metal net or the metal frame (79) and the bottom surface of the oven (1); the fibrous layer (80) giving the upper surface of the metal mesh or frame (79); the fiber layer (80) is communicated with a drainage groove (70) arranged at the bottom of the oven (1) through a drainage head (81); the fruit and vegetable drying unit (64) is arranged on the fiber layer (80) and moves along the length direction of the fiber layer (80).

7. The fruit and vegetable drying device according to claim 6, wherein: the porosity of the fiber layer (80) is not lower than 95%; the material of the fiber layer (80) is selected from woven fabric, knitted fabric, non-woven fabric or polyester fiber.

8. The fruit and vegetable drying device according to any one of claims 1-7, wherein: the fruit and vegetable drying unit (64) comprises two rotary conveying wheels (67) and a conveying chain (68) wound outside the two rotary conveying wheels (67); the drying unit bracket (66) extends into a conveying cavity of a traveling crane of a conveying chain (68) and two rotary conveying wheels (67).

9. The fruit and vegetable drying device according to claim 8, characterized in that: the fruit and vegetable drying device also comprises a cleaning device; the cleaning device comprises a cleaning roller (75) and a cleaning scraper (76) arranged in the circumferential direction of the cleaning roller (75); the cleaning roller (75) is arranged at the bottom of the fruit and vegetable drying unit (64) and synchronously rotates with the rotary conveying wheel (67); the cleaning scraper (76) is tangent to the conveying chain (68) at the bottom of the fruit and vegetable drying unit (64).

10. The fruit and vegetable drying device of claim 9, wherein: the cleaning scraper (76) is integrally arc-shaped, and the cleaning scraper (76) comprises a scraper frame (77) and an elastic buffer layer (78) arranged on the scraper frame (77); the scraper frame (77) is arranged in the circumferential direction of the cleaning roller (75); the elastic buffer layer (78) is tangent to the conveying chain (68) at the bottom of the fruit and vegetable drying unit (64); the elastic buffer layer (78) is made of rubber materials, and the thickness of the elastic buffer layer (78) is 0.5-2 mm.

Technical Field

The invention belongs to the field of agricultural machinery, and relates to a fruit and vegetable drying device.

Background

During processing, storage and transportation, fruits and vegetables can generate various physical, chemical and biological changes, and the changes can affect the edible quality, the nutritional quality and the functional quality of the fruits and vegetables. The fruit and vegetable drying technology is a processing mode integrating drying and dehydration into a whole, which removes water in fresh fruits and vegetables under natural conditions or by using the drying technology, reduces the water content of raw materials, plays a role in facilitating preservation.

The application number is 201810249779.9's invention, a fruit vegetables drying-machine is disclosed, including the drying chamber, the top of drying chamber is equipped with the feed inlet, the inside top of drying chamber corresponds the feed inlet and is provided with the distributing device, the distributing device can evenly tile the material on a plurality of cloth turns over the board that arranges in proper order and sets up, the cloth turns over the board downside and is equipped with liftable supporting mechanism, liftable supporting mechanism is connected with the transmission of lift drive arrangement, the last blanking passageway that supplies the material to fall that leaves of liftable supporting mechanism, the inside below vertical interval arrangement that is located the distributing device of drying chamber is provided with at least one deck stoving layer of support, the stoving support layer includes a plurality of stoving that arrange in proper order and sets up turns over the board, the stoving turns over the board and rotationally connects on the drying chamber through the stoving pivot, the stoving pivot. The invention can ensure that the turnover plate is opened in the whole length, materials of all layers are safely transferred step by step, the materials are ensured to be fully contacted with hot air, and the materials are fully dried.

The patent number is 201720898805.1's utility model, a fruit and vegetable processing drying-machine is disclosed, its structure includes base, drying-machine box, feed inlet, viewing aperture, air intake, air outlet, control button, places frame, driving motor, metal conveying mesh belt, dehumidifier, benzene board, and the base top is equipped with the drying-machine box to be connected with the drying-machine box, drying-machine box front end is equipped with places the frame, and with place a fixed connection, base top right side is connected with driving motor. According to the fruit and vegetable processing dryer, the dehumidifier is arranged to be matched with the air outlet, so that waste gas after drying operation enters the dehumidifier through the air outlet to be removed, and the problem that the dried waste gas cannot be treated is solved; through the matching of the dryer and the heating pipe, the dryer conveys hot air, hot air backflow is carried out in the dryer box body, and the heating pipe plays a role in assisting further drying, so that the problem that large-area drying cannot be carried out is solved.

The invention with application number 201710964805.1 discloses a fruit and vegetable drying device, which comprises: the device comprises a shell, a feed inlet is formed above the shell, and a discharge outlet is formed in the bottom end of the side surface of the shell; the air heater is provided with a heat conduction pipe, the heat conduction pipe is connected with the shell, and the pipe orifice of the heat conduction pipe is positioned at the bottom end of the side surface of the shell; the exhaust pipe is connected with the shell; the conveying belts are positioned in the shell, each group of conveying belts are sequentially arranged up and down, and the conveying directions of two adjacent groups of conveying belts are opposite; the spiral conveying device is positioned in the shell and positioned on one side of the conveying belt; and the rotating plate is positioned between the two groups of conveying belts at the bottom and is adjacent to the discharge port. The fruit and vegetable drying device can convey the fresh fruits continuously and circularly, so that the fresh fruits can be in an environment of heating, drying and moving for a long time, and the fresh fruits are uniformly heated.

The patent number is 201621270161's utility model, discloses a fruit vegetables drying-machine with turn-down rig, be equipped with the shell of feed inlet including the top, the roof and the head end lateral wall of shell are solid construction, and antetheca, back wall, tail end lateral wall and bottom are hollow structure, and the hollow structure inner wall is equipped with the ventilation hole. The bottom of the tail end of the shell is provided with an air heater, the air heater is connected with a bottom cavity of the shell through a main air supply pipe, and the peripheral wall of the main air supply pipe is connected with a branch air supply pipe. The rear wall of the shell is fixedly connected with a buffer box, and the buffer box is connected with a branch air supply pipe. The shell is internally provided with at least three layers of conveying mesh belts, and two ends of each conveying mesh belt are provided with transmission rollers. And a plurality of groups of ventilating turning devices are arranged on the first layer of conveying net belt and the second layer of conveying net belt. The top of shell is equipped with the passageway of airing exhaust, and waste heat recovery pipeline is connected to air outlet department of passageway of airing exhaust, and waste heat recovery pipeline's air outlet is connected to in the box body of shell. An axial flow fan is arranged at the air inlet and the air outlet of the waste heat recovery pipeline, a dehumidifier is arranged at the middle section of the waste heat recovery pipeline, and a discharging channel is arranged at the bottom of the head end of the shell.

The traditional drying mode comprises natural drying, hot air drying and the like, the raw materials are in the external environment in the natural drying mode, the conditions are not easy to control, and the sanitary quality of the product is worried. The hot air drying is the main drying mode at present, has low production cost and easy control, but has the defects of low efficiency, high temperature, easy color loss and taste loss of products and influenced taste and nutritional quality.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides the fruit and vegetable drying device which can avoid the damage to the internal structure of the fruit and vegetable, retains the nutrition inside the fruit and vegetable, has stable drying effect and good drying quality, and can be widely applied to the field of hot air drying of the fruit and vegetable.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a fruit vegetables drying device which characterized in that: the fruit and vegetable drying device comprises an oven, a feeding hole, a discharging hole, a moisture exhaust fan, an air heater, a fruit and vegetable conveying platform, a supporting frame, a fruit and vegetable drying unit and a drying unit bracket; a feed inlet and a discharge outlet are formed in the oven; the fruit and vegetable conveying platform, the fruit and vegetable drying unit and the drying unit bracket are all arranged in the oven; the fruit and vegetable drying unit is arranged on the drying unit bracket; the feed inlet faces the fruit and vegetable conveying platform; the fruit and vegetable conveying platform conveys the fruits and vegetables to be dried, which enter the oven through the feeding hole, to the fruit and vegetable drying unit; the upper surface of the drying unit bracket is non-planar; the fruit and vegetable drying unit is movable; the hot air blower is communicated with the inside of the drying oven and provides hot air for the fruit and vegetable drying unit; the fruit and vegetable drying unit conveys the dried fruits and vegetables to a discharge port; the moisture exhausting fan is communicated with the inside of the oven and extracts moisture from the inside of the oven.

Preferably, the fruit and vegetable drying unit adopted by the invention at least comprises a first fruit and vegetable drying unit and a second fruit and vegetable drying unit which are sequentially arranged from top to bottom; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit have the same structure; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are respectively arranged in the drying oven through drying unit supports; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are both parallel to the bottom of the oven; the first fruit and vegetable drying unit and the second fruit and vegetable drying unit are opposite in movement direction; the fruit and vegetable conveying platform conveys the fruits and vegetables to be dried, which enter the oven through the feeding hole, to the first fruit and vegetable drying unit; the first fruit and vegetable drying unit transports the fruits and vegetables to be dried on the first fruit and vegetable drying unit to a second fruit and vegetable drying unit; the second fruit and vegetable drying unit conveys the dried fruits and vegetables on the second fruit and vegetable drying unit to the discharge hole.

Preferably, the upper surface of the drying unit bracket adopted by the invention is a chute; the fruit and vegetable drying unit moves on the chute and along the length direction of the chute; a drainage groove communicated with the chute is formed in the bottom of the oven; the hot air blower supplies hot air to the fruit and vegetable drying unit through the chute of the drying unit bracket.

Preferably, the chute adopted by the invention comprises a chute curved surface, a vent hole, an annular bulge and a conveying pipeline; a conveying pipeline communicated with the drainage groove is arranged at a low-lying position of the curved surface of the chute; the curved surface of the chute is provided with a vent hole communicated with the air heater; the vent hole is outwards provided with a flange, and the flange wraps the vent hole and forms an annular bulge; the vent hole is one or more; the hot air blower supplies hot air to the fruit and vegetable drying unit through the ventilation holes in the curved surface of the chute.

Preferably, the length of the curved surface of the chute adopted by the invention along the advancing direction of the fruits and vegetables to be dried is x₀Width of y₀The maximum thickness of the drying unit bracket is z₀The point m (x, y, z) is any point on the chute curved surface, and the coordinates of the point m (x, y, z) satisfy:

wherein x is₀、y₀And z₀Satisfies the following relationship: 100z₀＜x₀≤200z₀，50z₀＜y₀≤100z₀；

The coordinates of the low-lying part of the chute curved surface are

Preferably, the drying unit bracket adopted by the invention comprises a metal net or a metal frame, a fiber layer and a drainage head; the metal net or the metal frame is integrally wedge-shaped, and an included angle is formed between the upper surface of the metal net or the metal frame and the bottom surface of the oven; the fiber layer endows the upper surface of the metal net or the metal frame; the fiber layer is communicated with a drainage groove arranged at the bottom of the oven through a drainage head; the fruit and vegetable drying unit moves on the fiber layer and along the length direction of the fiber layer.

Preferably, the porosity of the fiber layer adopted by the invention is not lower than 95%; the material of the fiber layer is selected from woven fabric, knitted fabric, non-woven fabric or polyester fiber.

Preferably, the fruit and vegetable drying unit adopted by the invention comprises two rotary conveying wheels and a conveying chain wound outside the two rotary conveying wheels; and the drying unit bracket extends into a conveying cavity of the travelling crane of the conveying chain and the two rotary conveying wheels.

Preferably, the fruit and vegetable drying device adopted by the invention further comprises a cleaning device; the cleaning device comprises a cleaning roller and a cleaning scraper arranged in the circumferential direction of the cleaning roller; the cleaning roller is arranged at the bottom of the fruit and vegetable drying unit and synchronously rotates with the rotary conveying wheel; the cleaning scraper is tangent to the conveying chain at the bottom of the fruit and vegetable drying unit.

Preferably, the cleaning scraper adopted by the invention is integrally arc-shaped, and comprises a scraper frame and an elastic buffer layer arranged on the scraper frame; the scraper frame is arranged in the circumferential direction of the cleaning roller; the elastic buffer layer is tangent to the conveying chain at the bottom of the fruit and vegetable drying unit; the elastic buffer layer is made of rubber materials, and the thickness of the elastic buffer layer is 0.5-2 mm.

Through the research, discover that hot-blast drying influences the drying consequence vegetables product quality in that the fruit vegetables condensation water that lies in the oven upper strata drops to the fruit vegetables of lower floor, make the fruit vegetables that reach certain stoving effect absorb water again and wet, not only greatly reduced the drying efficiency of fruit vegetables, the drying time of the fruit vegetables of extension, and fruit vegetables are dried repeatedly and absorb water and wet, the rhythm of fruit vegetables moisture outdiffusion and internal diffusion has been influenced, make the inside moisture diffusion of fruit vegetables uneven and irregular, it is inhomogeneous to have local stoving effect, the inside fold scheduling problem of fruit vegetables easy crust.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses a fruit and vegetable drying device, which belongs to the field of agricultural machinery and comprises an oven, a feeding port, a discharging port, a moisture-removing fan and an air heater, wherein a fruit and vegetable conveying platform is arranged in the oven, the fruit and vegetable conveying platform is fixedly arranged in the oven through a supporting frame, the feeding port is arranged above the front end of the fruit and vegetable conveying platform, the discharging port is arranged below the rear end of the fruit and vegetable conveying platform, the air heater is arranged below the fruit and vegetable conveying platform and conveys hot air upwards, and the moisture-removing fan is arranged above the fruit and vegetable conveying platform and discharges water vapor taken out of fruits and vegetables to the outside. According to the invention, the drying unit bracket below the conveying chain is designed into a chute shape for collecting condensed water, so that the condensed water dripping on the conveying chain is collected into the drainage groove along the chute of the drying unit bracket and is discharged out of the drying oven, and the condensed water is effectively prevented from dripping into fruits and vegetables on the lower-layer conveying chain, thereby preventing the quality of the fruits and vegetables from being influenced by repeated drying and water absorption and moisture; the shape of the condensate chute is designed through three-dimensional modeling, so that condensate water dropping on the chute from different positions can be quickly converged to the bottommost part and is discharged from the drainage tank through a conveying pipeline; the curved surface of the chute is provided with a vent hole for enabling hot air below to upwards circulate, and the hot air passes through the vent hole to form high-speed hot air flow to be blown on the conveying chain and the fruits and vegetables above the curved surface of the chute, so as to take away the moisture on the fruits and vegetables, thereby achieving the aim of drying; the design of the annular bulge can separate the air flow from the water flow of the condensed water, so that the best drying effect of fruits and vegetables is achieved. The fruit and vegetable drying device capable of improving the taste and the nutritional quality of the product directly dries the multi-layer fruit and vegetable conveying platform through hot air, avoids damage to the internal structure of the fruits and vegetables while drying, retains the internal nutrition of the fruits and vegetables, is stable in drying effect and good in drying quality, and can be widely applied to the field of hot air drying of the fruits and vegetables.

Drawings

FIG. 1 is a schematic structural diagram of a fruit and vegetable drying device provided by the invention;

FIG. 2 is a schematic perspective view of a drying unit rack used in the present invention;

FIG. 3 is a schematic view of the structure of the curved surface of the chute used in the present invention;

FIG. 4 is a schematic view of a cleaning roll used in the present invention;

FIG. 5 is a schematic side view of another preferred drying unit rack for use with the present invention;

FIG. 6 is a schematic perspective view of another preferred drying unit rack used in the present invention;

wherein:

1-baking oven; 2-a feed inlet; 3-discharging port; 4-a moisture removal fan; 5-a hot air blower; 6-fruit and vegetable conveying platform; 61-fruit and vegetable feeding platform; 62-horizontal fruit and vegetable drying platform; 63-a feed conveying section; 64-a fruit and vegetable drying unit; 65-a protruding section; 66-drying unit support; 67-rotating transport wheels; 68-a conveyor chain; 69-chute; 70-a drainage groove; 71-chute curvature; 72-a vent hole; 73-annular protrusion; 74-a delivery conduit; 75-cleaning rollers; 76-cleaning scraper; 77-scraper holder; 78-an elastic buffer layer; 79-metal mesh or metal frame; 80-a fiber layer; 81-drainage head.

Detailed Description

The present invention will be described in further detail with reference to the following examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 4, the fruit and vegetable drying device provided by the invention comprises an oven 1, a feeding port 2, a discharging port 3, a moisture exhausting fan 4 and an air heater 5, wherein a fruit and vegetable conveying platform 6 is arranged in the oven 1, the fruit and vegetable conveying platform 6 is fixedly arranged in the oven 1 through a support frame, the feeding port 2 is arranged above the front end of the fruit and vegetable conveying platform 6, the discharging port 3 is arranged below the rear end of the fruit and vegetable conveying platform 6, the air heater 5 is arranged below the fruit and vegetable conveying platform 6 and conveys hot air upwards, and the moisture exhausting fan 4 is arranged above the fruit and vegetable conveying platform 6 and discharges water vapor taken out of the fruits and vegetables to the outside of the oven 1.

Fruit vegetables conveying platform 6 includes fruit vegetables feeding platform 61 and horizontal fruit vegetables stoving platform 62, and fruit vegetables feeding platform 61 sets up in the middle of feed inlet 2 and horizontal fruit vegetables stoving platform 62, and fruit vegetables feeding platform 61 includes the feeding conveying section 63 that is used for carrying the fruit vegetables of the input of feed inlet 2 to horizontal fruit vegetables stoving platform 62 of one section slope at least.

Horizontal fruit vegetables stoving platform 62 includes the fruit vegetables stoving unit 64 of the vertical direction evenly distributed of at least three-layer, the fruit vegetables stoving unit 64 that is located the top is rather than the transport direction of the adjacent fruit vegetables stoving unit 64 in below, the fruit vegetables stoving unit 64 that is located the centre entry one end is located the adjacent fruit vegetables stoving unit 64 in its top export one end below and the tip is than the adjacent fruit vegetables stoving unit 64 in its top export one end salient segment 65 that the top discharged the fruit vegetables.

The fruit and vegetable drying unit 64 includes a drying unit support 66, two rotary conveying wheels 67 disposed at the left and right ends of the drying unit support 66, and a conveying chain 68 fitted around the outer circumferences of the two rotary conveying wheels 67, as shown in fig. 2, at least one inclined groove 69 inclined toward the front side or the rear side is provided in the left and right direction on the upper surface of the drying unit support 66, and a drain groove 70 for discharging condensed water dropped from the inclined groove 69 to the outside of the oven 1 is provided at a position right below the inclined groove 69 at the bottom of the oven 1.

As shown in fig. 3, the chute 69 comprises a chute curved surface 71 forming the main body of the chute 69 and vent holes 72 uniformly distributed on the chute curved surface 71, and the contact edge of the vent holes 72 and the chute curved surface 71 is provided with an annular projection 73 for preventing the condensed water in the chute curved surface 71 from flowing into the vent holes 72.

The length of each chute curved surface 71 along the length of the conveyor chain 68 is x₀Width of y₀The maximum thickness of the drying unit supporter 64 is z₀The point m (x, y, z) is any point on the contour of the chute curved surface 71, and the coordinates thereof satisfy

Wherein x is₀、y₀And z₀Satisfies the following relationship: 100z₀＜x₀≤200z₀，50z₀＜y₀≤100z₀。

At the lowest position of the chute curved surface 71A delivery pipe 74 for delivering the condensed water collected by the chute curved surface 71 to the drain tank 70 is provided.

Each fruit and vegetable drying unit 64 is provided with a cleaning roller 75 below one end of the outlet, which is used for brushing the fruits and vegetables attached to the conveying chain 68, as shown in fig. 4, cleaning scrapers 76 are uniformly distributed on the circumferential surface of the cleaning roller 75, the number of the cleaning scrapers 76 is preferably 8, and the cleaning scraper 76 positioned at the top contacts with the surface of the conveying chain 68. The cleaning scraper 76 is integrally arc-shaped, and comprises a scraper frame 77 positioned inside the cleaning scraper 76 and an elastic buffer layer 78 uniformly attached to the scraper frame 77, wherein the elastic buffer layer 78 is made of a rubber material, the thickness of the elastic buffer layer is 0.5-2 mm, and the scraper frame 77 is made of a stainless steel material.

As a preferred embodiment, the drying unit frame 66 is composed of a metal net or metal frame 79 inclined in the front-back direction and a fiber layer 80 fixedly attached to the metal net or metal frame 79, as shown in fig. 5 and 6, at least one drainage head 81 is provided on the fiber layer 80 at the lowest end side of the metal net or metal frame 79, and the drainage head 81 is located at the lower side of the fiber layer.

The metal mesh and the fiber layer are matched for use, so that condensed water dropping from the upper part of the drying unit bracket is absorbed in the fiber layer 80, is diffused in the fiber layer through the capillary effect of the fiber layer and drops into the drainage groove from the end part of the drainage head 81 at the lowest position; and because the metal net or the metal frame 79 and the fiber layer 80 are provided with holes inside, hot air positioned below the drying unit bracket can directly reach the upper part of the drying unit bracket through the holes between the metal frame 79 and the fiber layer 80, and the fruits and vegetables on the conveying chain above the drying unit bracket are dried.

The fiber layer 80 can be made of fabric such as woven fabric, knitted fabric, non-woven fabric, etc., preferably chemical fiber with good water absorption, such as polyester fiber with hollow irregular cross section.

The weaving structure of the fiber layer 80 is preferably non-woven fabric, and the fiber layer is woven by two types of fiber with different thicknesses, so that the porosity is more than 95%.

Through the research, discover that hot-blast drying influences the drying consequence vegetables product quality in that the fruit vegetables condensation water that lies in the oven upper strata drops to the fruit vegetables of lower floor, make the fruit vegetables that reach certain stoving effect absorb water again and wet, not only greatly reduced the drying efficiency of fruit vegetables, the drying time of fruit vegetables has been prolonged, and fruit vegetables are dried repeatedly and absorb water and wet, the rhythm of fruit vegetables moisture outdiffusion and internal diffusion has been influenced, make the inside moisture diffusion of fruit vegetables uneven and irregular, it is inhomogeneous to have local stoving effect, the inside fold scheduling problem of fruit vegetables easy crust. The drying unit support below the conveying chain is designed into a chute shape for collecting the condensed water, so that the condensed water dripping on the conveying chain is collected into the drainage groove along the chute of the drying unit support and is discharged out of the drying oven, the condensed water is effectively prevented from dripping onto fruits and vegetables on the lower-layer conveying chain, and the fruit and vegetable quality is prevented from being influenced by repeated drying and water absorption.