CN210220569U

CN210220569U - Continuous hot air drying system

Info

Publication number: CN210220569U
Application number: CN201920743203.8U
Authority: CN
Inventors: Donglin Zhao; 赵东林; Haijun Zhou; 周海军; Rong Yuan; 袁荣; Yonghui Li; 李永辉; Tianqi Lu; 卢天齐; Pan Chen; 陈盼
Original assignee: CHINA PACKAGING & FOOD MACHINERY Co Ltd
Current assignee: CHINA PACKAGING & FOOD MACHINERY Co Ltd
Priority date: 2019-05-22
Filing date: 2019-05-22
Publication date: 2020-03-31
Anticipated expiration: 2029-05-22

Abstract

The utility model discloses a continuous hot air drying system, which comprises a plurality of hot air circulation cavities and a conveyer belt which runs through each hot air circulation cavity and is used for conveying materials, wherein the hot air circulation cavities are connected in series along the advancing direction of the materials; a conveying cavity and a hot air circulation cavity which are arranged left and right are respectively arranged in the hot air circulation cavity, and the conveying belt is arranged in the conveying cavity; an air inlet cavity and an air exhaust cavity are arranged in the heated air circulation cavity, the air inlet cavity is connected with the air exhaust cavity through an air exhaust device, a heating device is arranged in the air exhaust cavity, the air inlet cavity is communicated with the upper cavity or the lower cavity through an air inlet channel, and air flow in the air exhaust cavity is heated by the heating device and then discharged into the conveying cavity. The utility model adopts the air flow heating and the hot air circulation to fully and repeatedly utilize the high temperature air flow, thereby saving the resources; the heat exchanger and the centrifugal fan are arranged in the box body, so that the energy loss is remarkably reduced; the continuity of agricultural and sideline products segmentation stoving is realized in the setting of conveyer belt, improves production efficiency, can adapt to mass production, and drying effect is good, has promoted agricultural and sideline products's quality greatly.

Description

Continuous hot air drying system

Technical Field

The invention relates to the technical field of agricultural and sideline product processing, in particular to a continuous hot air drying system which can be used for processing fruit and vegetable dehydration drying products, such as dried apples and dried vegetables (celery, beans, potatoes, green peppers, ginger slices) and the like, and can also be used for drying Chinese medicinal materials and flower buds.

Background

After the agricultural and sideline crops are received, in order to store for a long time, the agricultural and sideline crops can be aired and processed, so that the water content of the crops is reduced, the dependence degree on weather is very high, a large amount of labor is needed, time and labor are wasted, and the quality of the agricultural and sideline products cannot be guaranteed.

With the improvement of the modernization level of agriculture, the requirement of agriculture on the dryer is more urgent, and the dryer is introduced into the market like a spring bamboo shoot after rain. The drying equipment which is used for drying agricultural and sideline products at present is mainly a box type dryer, a tunnel type dryer and a belt type dryer. The first two are intermittent operation, the labor intensity is high, the automation degree is low, and the uncontrollable factors are more; the belt dryer realizes the continuity and automation of material inlet and outlet, has high labor productivity, can meet the requirements of modern mass production, and is widely adopted. The existing belt type dryer has single layer and multiple layers, hot air passes through the single layer upwards or downwards and is chopped into materials, and moisture after heat transfer and mass transfer is directly discharged to the atmosphere. The mesh belt for conveying materials is driven by the conveyor to move slowly in the box body, and the materials are gradually dried. Its main disadvantages are as follows: the heating energy consumption is high, the through-flow hot air is not fully utilized, and the energy waste is serious; heat maldistribution on the box intranet area, though production efficiency has been improved on the surface, but actually has caused the agricultural and sideline products that some positions were placed to dry the back moisture content great, and some position heats are higher for the agricultural and sideline products contain the nutrient composition and run off.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a continuous hot air drying system, which adopts closed-loop hot air drying, has uniform heat distribution, can fully utilize heat, can adapt to mass production and has good drying quality.

The invention adopts the following technical scheme:

a continuous hot air drying system comprises a plurality of hot air circulation cavities and a conveying belt penetrating through each hot air circulation cavity and used for conveying materials, wherein the hot air circulation cavities are connected in series along the advancing direction of the materials; a conveying cavity and a hot air circulation cavity which are arranged on the left and right are respectively arranged in the hot air circulation cavity, and the conveying belt is arranged in the conveying cavity and divides the conveying cavity into an upper cavity and a lower cavity; an air inlet cavity and an air exhaust cavity are arranged in the heated air circulation cavity, the air inlet cavity is connected with the air exhaust cavity through an air exhaust device, a heating device is arranged in the air exhaust cavity, the air inlet cavity is communicated with the upper cavity or the lower cavity through an air inlet channel, and air flow in the air exhaust cavity is heated by the heating device and then discharged into the lower cavity or the upper cavity.

The hot air circulation cavity comprises at least one first hot air circulation cavity and at least one second hot air circulation cavity, and the first hot air circulation cavity and the second hot air circulation cavity are connected in series alternately along the material advancing direction; a first conveying cavity and a first hot air circulation cavity which are arranged left and right are arranged in the first hot air circulation cavity, and the conveying belt is arranged in the first conveying cavity and divides the first conveying cavity into a first upper cavity and a first lower cavity; a first air inlet cavity and a first air exhaust cavity are arranged in the first hot air circulation cavity, the first air inlet cavity is connected with the first air exhaust cavity through a first air exhaust device, a first heating device is arranged in the first air exhaust cavity, the first air inlet cavity is communicated with the first upper cavity through a first air inlet channel, and air flow in the first air exhaust cavity is heated by the first heating device and then is exhausted into the first lower cavity;

a second conveying chamber and a second hot air circulation chamber which are arranged left and right are arranged in the second hot air circulation chamber, the conveying belt is arranged in the second conveying chamber, and the second conveying chamber is divided into a second upper chamber and a second lower chamber; the second air inlet cavity is connected with the second air exhaust cavity through a second air exhaust device, a second heating device is arranged in the second air exhaust cavity, the second air inlet cavity is communicated with the second lower cavity through a second air inlet channel, and air flow in the second air exhaust cavity is heated by the second heating device and then discharged into the second upper cavity.

The first exhaust chamber in the first hot air circulation cavity is positioned at the lower part of the first hot air circulation chamber, the first heating device is arranged between the first exhaust chamber and the first lower chamber, and the first air inlet chamber positioned at the upper part of the first hot air circulation chamber is communicated with the first upper chamber through the first air inlet channel; the second air exhaust cavity in the second hot air circulation cavity is positioned at the upper part of the second hot air circulation cavity, the second heating device is arranged between the second air exhaust cavity and the second upper part cavity, and the second air inlet cavity is positioned at the lower part of the second hot air circulation cavity and is communicated with the second lower part cavity through the second air inlet channel.

A first vertical partition plate and a first transverse partition plate are arranged in the first hot air circulation cavity, the first vertical partition plate is arranged along the material conveying direction, and a first upper cavity and a first air inlet cavity in the first hot air circulation cavity are separated; the first transverse partition plate divides the first hot air circulation chamber into a first air inlet chamber and a first air outlet chamber;

a second vertical partition plate and a second transverse partition plate are arranged in the second hot air circulation cavity, the second vertical partition plate is arranged along the material conveying direction, and a second lower cavity and a second air inlet cavity in the second hot air circulation cavity are separated; the second transverse partition plate divides the second hot air circulation chamber into a second air inlet chamber and a second air exhaust chamber.

The first air inlet channel communicated with the first air inlet cavity is arranged above the first vertical partition plate in the first hot air circulation cavity; a first air supplementing opening is formed in the top of the first air inlet cavity of the first hot air circulation cavity, and the first air inlet channel and the first air supplementing opening are communicated with an air inlet of the first exhaust device;

a second air inlet channel communicated with the second air inlet cavity is arranged below the second vertical partition plate in the second hot air circulation cavity; and a second air supplementing opening is formed in the bottom of the second air inlet cavity of the second hot air circulation cavity, and the second air inlet channel and the second air supplementing opening are communicated with an air inlet of the second air exhaust device.

In the first hot air circulation cavity, a material stirring wheel is arranged above the conveying belt along the direction vertical to the material conveying direction, a first air equalizing plate is arranged below the conveying belt, and the first air equalizing plate is obliquely arranged in a way that the side close to the first heating device is high and the side far away from the first heating device is low;

in the second hot air circulation cavity, a second air equalizing plate is arranged above the conveying belt and is obliquely arranged, wherein the second air equalizing plate is close to the side of the second heating device and is far away from the side of the second heating device.

As the distance between the vent holes on the first air equalizing plate and the first heating device is increased, the number and the diameter of the vent holes are increased; along with the increase of the distance between the vent holes on the second air equalizing plate and the second heating device, the number of the vent holes is increased, and the diameter of the vent holes is increased.

The first air equalizing plate and the second air equalizing plate are both lock catch type self-sealing air equalizing plates.

The top of the first upper cavity of the first hot air circulation cavity is provided with a first dehumidifying pipeline, the lower end of the side wall of the second lower cavity of the second hot air circulation cavity is provided with a second dehumidifying pipeline, the first dehumidifying pipeline is communicated with the second dehumidifying pipeline, and a dehumidifier is arranged on the pipeline communicated with the second dehumidifying pipeline and used for dehumidifying moisture generated in the material drying process.

The conveyor belt is a chain network structure facilitating gas flow.

The two ends of the conveying belt are respectively provided with a baffle curtain in the first hot air circulation cavity and the second hot air circulation cavity along the material conveying direction, and the position of the baffle curtain can be adjusted up and down along the material thickness so as to reduce the leakage of hot air or the wind between the cavities.

The curtain comprises an adjusting orifice plate, a movable curtain and a movable curtain, wherein a plurality of vertical strip holes are formed in the adjusting orifice plate along the length direction of the adjusting orifice plate, and the movable curtain can move up and down along the vertical strip holes; the movable stop curtain is positioned below the movable stop curtain and is hinged with the movable stop curtain;

the movable curtain is composed of a plurality of sections along the length direction.

Conveying belt protection plates are respectively arranged at two ends of the first hot air circulation cavity and the second hot air circulation cavity along the width direction of the conveying belt;

the outside of the conveying belt guard plate is provided with a cavity guard plate, the cavity guard plate is connected with the first hot air circulation cavity or the second hot air circulation cavity through a cavity pressure spring, the cavity guard plate depends on the pressure stretching force of the cavity pressure spring to enable the cavity guard plate to be tightly attached to the conveying belt guard plate, and the conveying belt guard plate is combined with the conveying belt guard plate to prevent materials from slipping out of the conveying belt and prevent the cavity from leaking wind.

The technical scheme of the invention has the following advantages:

A. the continuous hot air drying system adopts air flow heating and hot air circulation, fully and repeatedly utilizes high-temperature air flow, and saves resources; the heat exchanger and the centrifugal fan are arranged in the box body, so that the energy loss is remarkably reduced; the arrangement of the conveying belt realizes the continuity of the sectional drying of the agricultural and sideline products, improves the production efficiency, can adapt to mass production and has good drying effect; the drying method has the advantages that the drying method is adopted in a segmented mode, so that the moisture in the agricultural and sideline products is gradually reduced, the moisture uniformity of the agricultural and sideline products after drying can be improved, the agricultural and sideline products are prevented from being dry outside and wet inside, the color of the dried agricultural and sideline products is uniform, and the quality of the agricultural and sideline products is greatly improved.

B. According to the continuous hot air drying system, each hot air circulation cavity is internally provided with a lock catch type self-sealing air equalizing plate, and the air equalizing plates are obliquely arranged in a first hot air circulation cavity which blows air upwards, wherein the air equalizing plates are higher close to the side of a heat exchanger and lower far away from the side of the heat exchanger; in a second hot air circulation cavity for downward blowing, the air equalizing plate is obliquely arranged in a manner of being close to the side of the heat exchanger and low and far away from the side of the heat exchanger. Under two kinds of above circumstances, the equal aerofoil is more in the trompil quantity far away from centrifugal fan, and the aperture is big more to guarantee that the velocity of wind is the same and homogeneous in being in same dry cross-section, the agricultural and sideline products material on the conveyer belt is heated evenly.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings which are needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained from the drawings without inventive labor to those skilled in the art.

FIG. 1 is a schematic view of the overall structure of a daylily drying system provided by the invention;

FIG. 2 is a structural view of a first hot air circulation chamber according to the present invention;

FIG. 3 is a structural view of a second hot air circulation chamber according to the present invention;

FIG. 4 is a sectional view of a heated air circulation chamber according to the present invention;

FIG. 5 is a sectional view of the first heated air circulation chamber;

FIG. 6 is an enlarged view of I in FIG. 4;

FIG. 7 is a schematic view of a conveyor apron structure;

fig. 8 is an outline view of the first heated air circulation chamber according to the present invention.

The labels in the figure are as follows:

1-first heated air circulation chamber

11-first transfer Chamber

111-first upper chamber, 112-first lower chamber

12-first heated air circulation Chamber

121-first air inlet chamber, 122-first air outlet chamber, 123-first air exhaust device 124-first heating device

1241-cooling water conduit, 1242-steam conduit

13-a first vertical clapboard, 14-a first transverse clapboard, 15-a first air inlet channel, 16-a first air supplement port, 17-a first air equalizing plate, 18-a first dehumidifying pipeline and 19-a material stirring wheel

2-second heated air circulation cavity

21-second transfer Chamber

211-second upper chamber, 212-second lower chamber

22-second heated air circulation chamber

221-a second air inlet chamber, 222-a second air exhaust chamber and 223-a second air exhaust device

224-second heating device

2241-Cooling Water conduit, 2242-steam conduit

23-a second vertical clapboard, 24-a second transverse clapboard, 25-a second air inlet channel, 26-a second air supplement port, 27-a second air equalizing plate and 28-a second dehumidifying pipeline

3-a conveyor belt; 4-a dehumidifier;

5-conveying belt guard board

51-front end of guard board; 52-shield groove

6-curtain

61-adjustable orifice plate, 62-movable curtain, 63-movable curtain

7-a feed end; 8-a discharge end; 9-a cavity pressure spring; 10-a cavity guard plate; 20-side opening of the door.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-3, the present invention provides a continuous hot air drying system, which includes a feeding end 7, at least one first hot air circulation cavity 1, at least one second hot air circulation cavity 2, a conveying belt 3 penetrating each of the first hot air circulation cavity 1 and the second hot air circulation cavity 2 for conveying a material, and a discharging end 8, wherein the first hot air circulation cavity 1 and the second hot air circulation cavity 2 are alternately connected in series along a material advancing direction; the conveyor belt 3 is a chain network structure to facilitate gas flow. A conveying chamber and a hot air circulation chamber which are arranged left and right are respectively arranged in the first hot air circulation chamber 1 and the second hot air circulation chamber 2, and a conveying belt is arranged in the conveying chamber and divides the conveying chamber into an upper chamber and a lower chamber; an air inlet cavity and an air exhaust cavity are arranged in the hot air circulation cavity, the air inlet cavity is connected with the air exhaust cavity through an air exhaust device, a heating device is arranged in the air exhaust cavity, the air inlet cavity is communicated with the upper cavity or the lower cavity through an air inlet channel, and air flow in the air exhaust cavity is heated by the heating device and then discharged into the lower cavity or the upper cavity. The continuous hot air drying system adopts air flow heating and hot air circulation, fully and repeatedly utilizes high-temperature air flow, and saves resources; the arrangement of the conveying belt realizes the continuity of the sectional drying of the agricultural and sideline products, improves the production efficiency, can adapt to mass production and has good drying effect; the drying method has the advantages that the drying method is adopted in a segmented mode, so that the moisture in the agricultural and sideline products is gradually reduced, the moisture uniformity of the agricultural and sideline products after drying can be improved, the agricultural and sideline products are prevented from being dry outside and wet inside, the color of the dried agricultural and sideline products is uniform, and the quality of the agricultural and sideline products is greatly improved.

Specifically, a first conveying chamber 11 and a first hot air circulation chamber 12 which are arranged left and right are arranged in the first hot air circulation cavity 1, the conveying belt 3 is arranged in the first conveying chamber 11, and the first conveying chamber 11 is divided into a first upper chamber 111 and a first lower chamber 112; a first air inlet chamber 121 and a first exhaust chamber 122 are arranged in the first hot air circulation chamber 12, the first air inlet chamber 121 and the first exhaust chamber 122 are connected through a first exhaust device 123, a first heating device 124 is arranged in the first exhaust chamber 122, the first air inlet chamber 121 is communicated with the first upper chamber 111 through a first air inlet channel 15, and air flow in the first exhaust chamber 122 is heated by the first heating device 124 and then discharged into the first lower chamber 112. A second conveying chamber 21 and a second hot air circulation chamber 22 which are arranged left and right are arranged in the second hot air circulation chamber 2, the conveying belt 3 is arranged in the second conveying chamber 21, and the second conveying chamber 21 is divided into a second upper chamber 211 and a second lower chamber 212; a second air inlet chamber 221 and a second air exhaust chamber 222 are arranged in the second hot air circulation chamber 22, the second air inlet chamber 221 and the second air exhaust chamber 222 are connected through a second air exhaust device 223, a second heating device 224 is arranged in the second air exhaust chamber 222, the second air inlet chamber 221 is communicated with the second lower chamber 212 through a second air inlet channel 25, and air in the second air exhaust chamber 222 is heated by the second heating device 224 and then discharged into the second upper chamber 211. The heating device and the air exhaust device are arranged in the air conditioner, so that the energy loss is remarkably reduced; the heating device is preferably a heat exchanger, and the exhaust device is preferably a centrifugal fan.

A first exhaust chamber 122 in the first hot air circulation chamber 1 is located at the lower part of the first hot air circulation chamber 12, a first heating device 124 is arranged between the first exhaust chamber 122 and the first lower chamber 112, and a first air inlet chamber 121 located at the upper part of the first hot air circulation chamber 12 is communicated with the first upper chamber 111 through a first air inlet channel 15; the second air exhaust chamber 222 in the second hot air circulation chamber 2 is located at the upper part of the second hot air circulation chamber 22, the second heating device 224 is disposed between the second air exhaust chamber 222 and the second upper chamber 211, and the second air intake chamber 221 located at the lower part of the second hot air circulation chamber 22 is communicated with the second lower chamber 212 through the second air intake channel 25.

A first vertical partition plate 13 and a first transverse partition plate 14 are arranged in the first hot air circulation cavity 1, the first vertical partition plate 13 is arranged along the material conveying direction, and a first upper cavity 111 and a first air inlet cavity 121 in the first hot air circulation cavity 1 are separated; the first transverse partition 14 divides the first warm air circulation chamber 12 into a first intake air chamber 121 and a first exhaust air chamber 122. A second vertical partition plate 23 and a second transverse partition plate 24 are arranged in the second hot air circulation cavity 2, the second vertical partition plate 23 is arranged along the material conveying direction, and a second lower cavity 212 and a second air inlet cavity 221 in the second hot air circulation cavity 2 are separated; the second horizontal partition 23 partitions the second hot air circulation chamber 22 into a second intake chamber 221 and a second exhaust chamber 222.

The first air inlet channel 15 is arranged above the first vertical partition plate 13 in the first hot air circulation cavity 1 and communicated with the first air inlet cavity 121; the top of the first air intake chamber 121 is provided with a first air supply opening 16, and the first air intake passage 15 and the first air supply opening 16 are communicated with an air intake of the first air exhausting device 123. The second air inlet channel 25 is arranged below the second vertical partition plate 23 in the second hot air circulation cavity 2 and communicated with the second air inlet cavity 221; the bottom of the second air intake chamber 221 is provided with a second air supply opening 26, and the second air intake channel 25 and the second air supply opening 26 are communicated with an air intake of the second air exhaust device 223.

In the first hot air circulation cavity 1, a material stirring wheel 19 is arranged above the conveying belt 3 along the vertical material conveying direction, a first air equalizing plate 17 is arranged below the conveying belt 3, and the inclined arrangement that the side close to the first heating device 124 is high and the side far away from the first heating device 124 is low is adopted, so that the number of the air holes is increased and the diameter of the air holes is increased along with the increase of the distance between the air holes in the first air equalizing plate 17 and the first heating device 124; in the second heated air circulation cavity 2, the second air-equalizing plate 27 is arranged above the conveying belt 3, and the inclined arrangement that the side of the second heating device 224 is low and the side of the second heating device 224 is high is adopted, and along with the increase of the distance between the vent holes on the second air-equalizing plate 27 and the second heating device 224, the number and the diameter of the vent holes are increased. First air-distributing plate 17 and second air-distributing plate 27 are lock catch type self-sealing air-distributing plates, and are composed of a plurality of blocks (fig. 5 shows the installation structure diagram of first air-distributing plate 17 in the first heated air circulation cavity, and first air-distributing plate 17 is located above conveyer belt 3 in second heated air circulation cavity 2, which is not described herein again). According to the continuous hot air drying system, each hot air circulation cavity is internally provided with a lock catch type self-sealing air equalizing plate, and the air equalizing plates are obliquely arranged in a first hot air circulation cavity which blows air upwards, wherein the air equalizing plates are higher close to the side of a heat exchanger and lower far away from the side of the heat exchanger; in a second hot air circulation cavity for downward blowing, the air equalizing plate is obliquely arranged in a manner of being close to the side of the heat exchanger and low and far away from the side of the heat exchanger. Under two kinds of above circumstances, the equal aerofoil is more in the trompil quantity far away from centrifugal fan, and the aperture is big more to guarantee that the velocity of wind is the same and homogeneous in being in same dry cross-section, the agricultural and sideline products material on the conveyer belt is heated evenly.

The top of the first upper cavity 111 in the first hot air circulation cavity 1 is provided with a first dehumidifying pipeline 18, the lower end of the side wall of the second lower cavity 212 in the second hot air circulation cavity 2 is provided with a second dehumidifying pipeline 28, the first dehumidifying pipeline 18 is communicated with the second dehumidifying pipeline 28, and a dehumidifier 4 is arranged on the pipeline communicating the first dehumidifying pipeline 18 with the second dehumidifying pipeline 28 and used for dehumidifying moisture generated in the material drying process.

As shown in fig. 4, two ends of the conveyor belt 3 in the material conveying direction in the first hot air circulation cavity 1 and the second hot air circulation cavity 2 are respectively provided with a baffle curtain 6, and the position of the baffle curtain 6 can be adjusted up and down along with the thickness of the material to reduce the leakage of hot air or the cross wind between the cavities. The curtain 6 comprises an adjusting pore plate 61, a movable curtain 62 and a movable curtain 63, the adjusting pore plate 61 is used as a mounting rack of the curtain 6, a plurality of vertical strip holes are arranged on the adjusting pore plate 61 along the length direction of the adjusting pore plate, and the movable curtain 62 can move up and down along the vertical strip holes; the movable curtain 63 is positioned below the movable curtain 62 and is hinged with the movable curtain 62; the movable curtain 63 is composed of several segments along its length. The movable blocking curtain 62 and the movable blocking curtain 63 are hinged and then fixed on the adjusting hole plate through bolts, and the bolts can adjust the distance between the blocking curtain 6 and the conveying belt 3 after being fastened at different long strip positions, so that the position of the blocking curtain 6 can be adjusted according to the thickness of the material layer, and the wind leakage phenomenon of a drying cavity is reduced.

Still be equipped with conveyer belt backplate 5 respectively (as shown in fig. 6) along 3 width direction's of conveyer belt both ends in first heated air circulation cavity 1 and the second heated air circulation cavity 2, the conveyer belt backplate 5 outside is equipped with cavity backplate 10, be connected through cavity pressure spring 9 between cavity backplate 10 and first heated air circulation cavity 1 or the second heated air circulation cavity 2, cavity backplate 10 relies on the pressure extension power of body pressure spring 9, push cavity backplate 10 to conveyer belt backplate 5, it is closely attached between messenger's cavity backplate 10 and the conveyer belt backplate 5, conveyer belt backplate 5 and the closely knit and frictional sliding of cavity backplate 10 pressfitting, play the sealed effect of guipure, prevent that conveyer belt backplate 5 from causing dry cavity to run out the wind short circuit phenomenon with cavity backplate 10 is sealed untight. The cavity guard plate 10, the conveying belt guard plate 5 and the conveying belt guard plate 5 are combined to prevent the materials from sliding out of the conveying belt 3.

Fig. 7 shows the structure of the conveyor belt guard plate 5, which includes a guard plate front end 51 and a guard plate groove 52 located at the rear end of the conveyor belt guard plate 5, during installation, the guard plate front end 51 of the rear conveyor belt guard plate 5 is embedded into the guard plate groove 52 at the rear end of the front conveyor belt guard plate 5, and the front and rear conveyor belt guard plates are closely attached together (fig. 5 shows the installation structure diagram of the conveyor belt guard plate 5 in the first heated air circulation cavity, and the installation structure diagram of the conveyor belt guard plate 5 in the second heated air circulation cavity 2 is similar thereto, and is not repeated here).

Fig. 8 shows an outline view of the first heated air circulation chamber 1, and a side door 20 is respectively arranged above and below the side surface of the chamber to facilitate inspection, cleaning and maintenance of the chamber. Like the first heated air circulation cavity 1, the side wall of the second heated air circulation cavity 2 is also provided with a side door, which is not described herein again.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.

Claims

1. The continuous hot air drying system is characterized by comprising a plurality of hot air circulation cavities and a conveying belt (3) penetrating through each hot air circulation cavity and used for conveying materials, wherein the hot air circulation cavities are connected in series along the advancing direction of the materials; a conveying cavity and a hot air circulation cavity which are arranged left and right are respectively arranged in the hot air circulation cavity, the conveying belt (3) is arranged in the conveying cavity, and the conveying cavity is divided into an upper cavity and a lower cavity; an air inlet cavity and an air exhaust cavity are arranged in the heated air circulation cavity, the air inlet cavity is connected with the air exhaust cavity through an air exhaust device, a heating device is arranged in the air exhaust cavity, the air inlet cavity is communicated with the upper cavity or the lower cavity through an air inlet channel, and air flow in the air exhaust cavity is heated by the heating device and then discharged into the lower cavity or the upper cavity.

2. The drying system according to claim 1, characterized in that the hot air circulation cavities comprise at least one first hot air circulation cavity (1) and at least one second hot air circulation cavity (2), and the first hot air circulation cavity (1) and the second hot air circulation cavity (2) are alternately connected in series along the material advancing direction; a first conveying cavity (11) and a first hot air circulation cavity (12) which are arranged left and right are arranged in the first hot air circulation cavity (1), the conveying belt (3) is arranged in the first conveying cavity (11), and the first conveying cavity (11) is divided into a first upper cavity (111) and a first lower cavity (112); a first air inlet chamber (121) and a first air exhaust chamber (122) are arranged in the first hot air circulation chamber (12), the first air inlet chamber (121) and the first air exhaust chamber (122) are connected through a first air exhaust device (123), a first heating device (124) is arranged in the first air exhaust chamber (122), the first air inlet chamber (121) is communicated with the first upper chamber (111) through a first air inlet channel (15), and air flow in the first air exhaust chamber (122) is heated by the first heating device (124) and then is exhausted into the first lower chamber (112);

a second conveying cavity (21) and a second hot air circulation cavity (22) which are arranged left and right are arranged in the second hot air circulation cavity (2), the conveying belt (3) is arranged in the second conveying cavity (21) and divides the second conveying cavity (21) into a second upper cavity (211) and a second lower cavity (212); a second air inlet chamber (221) and a second air exhaust chamber (222) are arranged in the second hot air circulation chamber (22), the second air inlet chamber (221) and the second air exhaust chamber (222) are connected through a second air exhaust device (223), a second heating device (224) is arranged in the second air exhaust chamber (222), the second air inlet chamber (221) is communicated with the second lower chamber (212) through a second air inlet channel (25), and air flow in the second air exhaust chamber (222) is heated by the second heating device (224) and then is exhausted into the second upper chamber (211).

3. The drying system of claim 2, wherein the first exhaust chamber (122) in the first hot air circulation chamber (1) is located at a lower portion of the first hot air circulation chamber (12), the first heating device (124) is disposed between the first exhaust chamber (122) and the first lower chamber (112), and the first intake chamber (121) located at an upper portion of the first hot air circulation chamber (12) is communicated with the first upper chamber (111) through the first intake duct (15); the second air exhaust chamber (222) in the second hot air circulation cavity (2) is located at the upper part of the second hot air circulation chamber (22), the second heating device (224) is arranged between the second air exhaust chamber (222) and the second upper chamber (211), and the second air inlet chamber (221) located at the lower part of the second hot air circulation chamber (22) is communicated with the second lower chamber (212) through the second air inlet channel (25).

4. A drying system according to claim 3, characterized in that a first vertical partition (13) and a first transverse partition (14) are provided in the first heated air circulation chamber (1), the first vertical partition (13) being disposed along the material conveying direction and separating a first upper chamber (111) from a first air intake chamber (121) in the first heated air circulation chamber (1); the first transverse clapboard (14) divides the first hot air circulation chamber (12) into a first air inlet chamber (121) and a first air outlet chamber (122);

a second vertical partition plate (23) and a second transverse partition plate (24) are arranged in the second hot air circulation cavity (2), the second vertical partition plate (23) is arranged along the material conveying direction, and a second lower cavity (212) and a second air inlet cavity (221) in the second hot air circulation cavity (2) are separated; the second transverse clapboard (24) divides the second hot air circulation chamber (22) into a second air inlet chamber (221) and a second air outlet chamber (222).

5. The drying system according to claim 4, characterized in that the first air intake channel (15) communicated with the first air intake chamber (121) is arranged above the first vertical partition (13) in the first hot air circulation chamber (1); a first air supplementing opening (16) is formed in the top of the first air inlet cavity (121) of the first hot air circulation cavity (1), and the first air inlet channel (15) and the first air supplementing opening (16) are communicated with an air inlet of the first air exhaust device (123);

a second air inlet channel (25) communicated with the second air inlet chamber (221) is arranged below the second vertical partition plate (23) in the second hot air circulation cavity (2); and a second air supplementing opening (26) is formed in the bottom of the second air inlet chamber (221) of the second hot air circulation cavity (2), and the second air inlet channel (25) and the second air supplementing opening (26) are communicated with an air inlet of the second air exhaust device (223).

6. The drying system according to any one of claims 2 to 5, characterized in that a material stirring wheel (19) is arranged above the conveyor belt (3) in the vertical material conveying direction in the first hot air circulation cavity (1), a first air equalizing plate (17) is arranged below the conveyor belt (3), and an inclined arrangement that the side close to the first heating device (124) is high and the side far away from the first heating device (124) is low is adopted;

in the second hot air circulation cavity (2), a second air equalizing plate (27) is arranged above the conveying belt (3), and the inclined arrangement that the side close to the second heating device (224) is low and the side far away from the second heating device (224) is high is adopted.

7. The drying system of claim 6, wherein, as the distance between the vent holes of the first air-equalizing plate (17) and the first heating device (124) increases, the number of the vent holes increases and the diameter of the vent holes increases; the number and the diameter of the vent holes are increased along with the increase of the distance between the vent holes on the second air equalizing plate (27) and the second heating device (224).

8. The drying system according to claim 7, characterized in that the first air-equalizing plate (17) and the second air-equalizing plate (27) are lock-type self-sealing air-equalizing plates.

9. The drying system according to claim 8, wherein a first dehumidifying pipe (18) is disposed at the top of the first upper chamber (111) of the first hot air circulating cavity (1), a second dehumidifying pipe (28) is disposed at the lower end of the sidewall of the second lower chamber (212) of the second hot air circulating cavity (2), the first dehumidifying pipe (18) is communicated with the second dehumidifying pipe (28), and a dehumidifier (4) is disposed on the pipe where the first dehumidifying pipe (18) is communicated with the second dehumidifying pipe (28) for dehumidifying moisture generated in the material drying process.

10. Drying system according to claim 9, characterised in that the conveyor belt (3) is of a chain network structure facilitating the circulation of air.

11. The drying system according to claim 10, wherein two ends of the conveyor belt (3) in the material conveying direction in the first hot air circulation chamber (1) and the second hot air circulation chamber (2) are respectively provided with a baffle curtain (6), and the position of the baffle curtain (6) can be adjusted up and down according to the thickness of the material to reduce the leakage of hot air or the wind crosstalk between the chambers.

12. The drying system according to claim 11, wherein the curtain (6) comprises an adjusting orifice plate (61), a movable curtain (62) and a movable curtain (63), the adjusting orifice plate (61) is provided with a plurality of vertical elongated holes along the length direction thereof, and the movable curtain (62) can move up and down along the vertical elongated holes; the movable curtain (63) is positioned below the movable curtain (62), and the movable curtain are hinged;

the movable curtain (63) is composed of a plurality of sections along the length direction.

13. The drying system according to claim 12, wherein a conveyor belt guard plate (5) is further respectively arranged at two ends of the first hot air circulation cavity (1) and the second hot air circulation cavity (2) along the width direction of the conveyor belt (3);

the outside of conveyer belt backplate (5) is equipped with cavity backplate (10), cavity backplate (10) with connect through cavity pressure spring (9) between first heated air circulation cavity (1) or second heated air circulation cavity (2), cavity backplate (10) rely on the pressure extension power of cavity pressure spring (9), make cavity backplate (10) with closely paste between conveyer belt backplate (5) in fact, with conveyer belt backplate (5) combine to be used for preventing the material landing from reaching outside the conveyer belt and prevent that the cavity from running wind.