Drying device

Abstract

The utility model belongs to the technical field of photovoltaic cell manufacturing, and discloses a drying device which comprises a drying box and a circulating system. The drying box comprises a box body and a cover plate, and the box body is used for containing a to-be-dried product. A to-be-dried product can be placed in the box body through the top opening of the box body, and the cover plate is used for opening and closing the top opening of the box body. First air outlet pipes are arranged on the two opposite inner side walls of the box body in the first direction, and a plurality of first air outlets which are distributed at intervals in the axis direction of the first air outlet pipes and face to-be-dried products are formed in the first air outlet pipes; a second air outlet pipe is arranged on the cover plate, and a plurality of second air outlets which are distributed at intervals in the axis direction of the second air outlet pipe and face the products to be dried are formed in the second air outlet pipe. One end of the circulating system is communicated with the reflux inlet of the box main body, and the first air outlet pipe and the second air outlet pipe are both communicated with the other end of the circulating system. According to the drying box, the gas flow direction in the box body is changed, gas circulation flow is enhanced, and the drying effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cell manufacturing, in particular to a drying device. Background Art

[0002] In the manufacturing process of solar photovoltaic cells, semi-finished batteries need to be placed in a drying box for drying. A supporting assembly is provided at the bottom of the drying box, and the semi-finished batteries are supported on the supporting assembly. In the prior art, an air outlet duct is provided on two opposite side walls in the drying box, and the air outlet duct is provided with air outlets spaced apart along its axial direction. The gas conveyor can blow the gas out through the air outlet through the air pipe, and then circulate through the bottom return port of the drying box. With this side-blowing drying method, the supporting assembly at the bottom of the drying box and the bottom of the semi-finished battery are not easy to dry. Insufficient drying of the semi-finished battery is easy to cause burning in the subsequent process, and residual liquid on the supporting assembly causes pollution to the next group of semi-finished batteries. Utility Model Content

[0003] The utility model aims to provide a drying device, which makes it easier to dry the bottom and supporting components of a semi-finished battery and improves the drying effect.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] Drying device, comprising:

[0006] A drying box, comprising a box body and a cover plate, wherein the box body has a product to be dried therein, and the cover plate is used to open and close the top opening of the box body; the two inner side walls of the box body opposite to each other along a first direction are each provided with a first air outlet pipe, the first air outlet pipe is provided with a plurality of first air outlets spaced apart along its axial direction and facing the product to be dried, the cover plate is provided with a second air outlet pipe, the second air outlet pipe is provided with a plurality of second air outlets spaced apart along its axial direction and facing the product to be dried, and the box body is provided with a return port;

[0007] A circulation system, one end of which is connected to the return port, and the other end of which is connected to the first air outlet pipe and the second air outlet pipe.

[0008] As an optional scheme, the second air outlet duct includes a plurality of single air outlet ducts spaced apart along the first direction, the plurality of single air outlet ducts are distributed above both sides of the product to be dried along the first direction and are respectively connected to the circulation system, and the axis of the second air outlet on the single air outlet duct is not perpendicular to the cover plate.

[0009] As an optional solution, the second air outlet pipe further includes a U-shaped pipe, the mutually parallel side pipes of the U-shaped pipe are respectively connected to the single air outlet pipe in a one-to-one correspondence, and the bottom pipe of the U-shaped pipe is connected to the circulation system.

[0010] As an optional solution, the side pipe and the single air outlet pipe are rotatably connected.

[0011] As an optional solution, two cover plates are provided, and each cover plate is provided with the second air outlet duct; and / or

[0012] The diameter of the first air outlet and / or the second air outlet ranges from 0.2 to 1 cm.

[0013] As an optional solution, the circulation system includes a gas conveyor and a circulation air duct, one end of the circulation air duct is connected to the return port, the first air outlet duct and the second air outlet duct are both connected to the other end of the circulation air duct, and the gas conveyor is arranged on the circulation air duct.

[0014] As an optional solution, the circulation system also includes a high-efficiency filter element, the first air outlet pipe and the second air outlet pipe are both connected to the air outlet connection port of the high-efficiency filter element, and the circulation air duct is connected to the air inlet connection port of the high-efficiency filter element.

[0015] As an optional solution, a flexible tube is provided between the second air outlet pipe and the high-efficiency filter element.

[0016] As an optional solution, a first pneumatic valve is further included, and the first pneumatic valve is used to make the flexible tube conductive or blocked.

[0017] As an optional solution, the circulation system further includes an air inlet pipe and a primary filter element, one end of the air inlet pipe is connected to the gas conveyor, the other end of the air inlet pipe is connected to the air outlet connection port of the primary filter element, and the air inlet connection port of the primary filter element is connected to the outside; and / or

[0018] A heating element, wherein the heating element is arranged on the circulating air duct; and / or

[0019] An exhaust duct and a second pneumatic valve, wherein the exhaust duct is connected to the circulating air duct, and the second pneumatic valve is used to control the conduction or blocking of the circulating air duct and the exhaust duct.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a drying device, which blows air to semi-finished batteries through a first air outlet and a second air outlet at the same time. Since the first air outlet blows air sideways and the second air outlet blows air from top to bottom, turbulence is generated when the two air flows converge, and then both flow to a return port. The entire circulation process forms circulating convection and eddy currents. Compared with the prior art, it can effectively change the gas flow direction in the box body and enhance the gas circulation flow, so that the semi-finished batteries and support components are easier to dry, and the semi-finished batteries are prevented from being burned due to residual liquid and the next group of semi-finished batteries from being contaminated by residual liquid on the support components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a drying device provided in an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a drying box involved in an embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the second air outlet pipe and the flexible pipe involved in the embodiment of the utility model.

[0025] In the figure:

[0026] 1. Drying box; 11. Box body; 111. First air outlet; 112. Return port; 113. Flower basket support plate; 114. Flower basket blocking rod; 12. Cover plate; 121. Second air outlet; 1211. Single air outlet; 1212. U-shaped tube; 1211a. Second air outlet; 13. Flexible tube; 14. U-shaped fixing clip;

[0027] 2. Gas conveyor; 3. Circulating air duct; 4. High-efficiency filter element; 5. Air inlet pipe; 6. Primary filter element; 7. Heating element; 8. Exhaust pipe; 9. Second pneumatic valve; 10. Peripheral pipeline. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides a drying device, including a drying box 1 and a circulation system.

[0033] The drying box 1 includes a box body 11 and a cover plate 12, and the products to be dried (such as semi-finished batteries) are arranged inside the box body 11 through a basket. Specifically, a support assembly is arranged on the bottom of the box body 11, and the support assembly includes a basket support plate 113 and a basket stop bar 114. The basket support plate 113 is arranged on the inner wall of the box body 11, and the semi-finished batteries are placed in the basket. The outer peripheral side of the basket is supported on the basket support plate 113, and the basket stop bar 114 is stopped on one side of the semi-finished batteries, that is, the basket is erected above the bottom of the box body 11 through the support assembly. The box body 11 has a top opening, and the semi-finished batteries can be placed in the box body 11 through the top opening. The cover plate 12 is used to open and close the top opening of the box body 11, so that the semi-finished batteries are in a closed environment.

[0034] The two inner side walls of the box body 11 that are opposite to each other along the first direction (i.e., the X-axis direction) are both provided with a first air outlet duct 111. In the present embodiment, the first direction is the width direction of the box body 11, and the first air outlet duct 111 is provided with a plurality of first air outlets that are spaced apart along its axial direction and face the semi-finished batteries; the cover plate 12 is provided with a second air outlet duct 121, and the second air outlet duct 121 is provided with a plurality of second air outlets 1211a that are spaced apart along its axial direction and face the semi-finished batteries; in the present embodiment, the first air outlet duct 111 and the second air outlet duct 121 both extend along the second direction (i.e., the Y-axis direction), and the second direction is the length direction of the box body 11. A return port 112 is provided at the bottom of the box body 11. One end of the circulation system is connected to the return port 112, and the other end is connected to both the first air outlet pipe 111 and the second air outlet pipe 121. The gas enters the box body 11 through the first air outlet and the second air outlet 1211a, and is discharged through the return port 112 and then enters through the first air outlet and the second air outlet 1211a to form a gas circulation.

[0035] The drying device blows air to the semi-finished batteries through the first air outlet and the second air outlet 1211a at the same time. Since the first air outlet blows air sideways and the second air outlet 1211a blows air from top to bottom, turbulence will be generated when the two airs converge, and then both flow to the return port 112. The whole circulation process forms circulating convection and eddy current. Compared with the prior art, it can effectively change the gas flow direction in the box body 11 and enhance the gas circulation flow, so that the semi-finished batteries placed on the flower basket, the flower basket support plate 113 and the flower basket gear rod 114 are easier to dry, avoiding the burning of the semi-finished batteries due to insufficient drying of the residual liquid and the pollution of the next group of semi-finished batteries by the residual liquid on the flower basket support plate 113 and the flower basket gear rod 114.

[0036] In another embodiment, the circulation system includes a gas conveyor 2 and a circulating air duct 3, one end of the circulating air duct 3 is connected to the return port 112 of the box body 11, and the first air outlet pipe 111 and the second air outlet pipe 121 are both connected to the other end of the circulating air duct 3 so that the gas can circulate, and the gas conveyor 2 is used to realize the circulation of gas.

[0037] In order to filter the gas in the box body 11, the circulation system also includes a high-efficiency filter element 4. A connecting port is opened on one side of the box body 11 along the second direction. The high-efficiency filter element 4 is fixedly arranged on the side of the box body 11 where the connecting port is opened, so that the circulating gas can enter the interior of the box body 11 after being filtered by the high-efficiency filter element 4, that is, the first air outlet pipe 111 and the second air outlet pipe 121 are both connected to the air outlet connection port of the high-efficiency filter element 4, and the circulation air duct 3 is connected to the air inlet connection port of the high-efficiency filter element 4.

[0038] Furthermore, a flexible tube 13 (which may be a polyvinylidene fluoride hose or a telescopic tube, etc.) is provided between the second air outlet 121 and the circulating air duct 3, and the flexible tube 13 does not affect the opening of the cover plate 12, that is, when the cover plate 12 opens the top opening of the box body 11, the second air outlet 121 on the cover plate 12 pulls the flexible tube 13, and the flexible tube 13 can deform itself; the gas conveyor 2 (which may be a wind pump) is provided on the circulating air duct 3, and can make the gas circulate between the box body 11 and the circulating air duct 3. After the gas conveyor 2 is opened, the gas enters the first air outlet 111 and the second air outlet 121 through the circulating air duct 3, and is discharged through the first air outlet and the second air outlet 1211a, respectively, and blows toward the semi-finished battery from the side and the top of the semi-finished battery. By providing the flexible tube 13 on the second air outlet 121, the opening of the cover plate 12 is not affected. Of course, in other embodiments, a rotary interface or a rotary interface in combination with a pipeline (which may be a flexible pipeline or a hard pipeline) may be used instead of the flexible tube 13 to achieve gas delivery without affecting the opening of the cover plate 12 .

[0039] The first air outlet pipe 111 and the flexible pipe 13 are both threadedly connected to the air outlet connection port of the high-efficiency filter element 4 .

[0040] Optionally, refer to Figure 2 A plurality of first air outlet pipes 111 are arranged on a side wall of the box body 11 along the first direction, and the plurality of first air outlet pipes 111 are spaced apart along the height direction (ie, the Z-axis direction) of the box body 11 to achieve blowing of the side surfaces of the semi-finished batteries over a larger range.

[0041] The second air outlet duct 121 includes a plurality of single air outlet ducts 1211 spaced apart along the first direction, and the plurality of single air outlet ducts 1211 are distributed above both sides of the product to be dried along the first direction and are respectively connected to the circulation system, and an axis of a second air outlet 1211a on the single air outlet duct 1211 is not perpendicular to the cover plate 12, that is, the second air outlet 1211a is inclined, and the airflow blown out through the second air outlet 1211a is inclined to flow toward the product to be dried, thereby increasing the drying efficiency.

[0042] In this embodiment, two semi-finished batteries are arranged at intervals along the first direction in the box body 11, and two cover plates 12 are arranged on the box body 11. The two cover plates 12 are hinged to the outer side walls of the box body 11 on both sides along the first direction. Two groups of second air outlet pipes 121 are arranged, and the two groups of second air outlet pipes 121 are respectively arranged on the two cover plates 12. After the two cover plates 12 close the top opening of the box body 11, the two groups of second air outlet pipes 121 correspond to the two semi-finished batteries respectively, that is, the first air outlet pipes 111 on both sides of the box body 11 along the first direction are respectively used to blow air to the side of the two semi-finished batteries close to the inner side wall of the box body 11, and the two groups of second air outlet pipes 121 are respectively used to blow air from the top of the two semi-finished batteries. The overall structural design is more reasonable, which improves the drying efficiency of the semi-finished batteries. Of course, in other embodiments, there can be only one cover plate 12, which is subject to actual application, and this application does not make specific restrictions. The first air outlet duct 111 and the second air outlet duct 121 may be arranged vertically, staggered, or parallel in space, depending on actual application, and this application does not impose any specific limitation.

[0043] like Figure 2-Figure 3 As shown, each group of second air outlet pipes 121 includes two single air outlet pipes 1211, and the two single air outlet pipes 1211 in each group of second air outlet pipes 121 are respectively arranged above the two sides of a semi-finished battery along the first direction, and the axes of the relative second air outlets 1211a on the two single air outlet pipes 1211 are arranged at an angle, that is, the second air outlets 1211a of the two single air outlet pipes 1211 can blow air toward the side and top surface of the semi-finished battery at the same time to improve the drying effect. The number and arrangement of the single air outlet pipes 1211 of the first air outlet pipe 111 and the second air outlet pipe 121 shall be based on the actual application, and may be one or more than one, and shall be adjusted according to the arrangement of the flower baskets, the number and the size of the box body 11, and this application does not make specific restrictions.

[0044] It is understandable that when a basket for placing semi-finished batteries is provided in the box body 11, a group of second air outlet pipes 121 corresponding to one basket is provided.

[0045] Each group of second air outlet pipes 121 also includes a U-shaped pipe 1212, and the two parallel side pipes of the U-shaped pipe 1212 are respectively connected to the two single air outlet pipes 1211, and the bottom pipe of the U-shaped pipe 1212 is connected to the flexible pipe 13. This structure can realize that each group of second air outlet pipes 121 is connected to the circulating air duct 3 through a flexible pipe 13.

[0046] Of course, the second air outlet duct 121 can also include only two single air outlet ducts 1211, and the two single air outlet ducts 1211 are directly connected to the two flexible tubes 13 respectively; or, the second air outlet duct 121 includes two single air outlet ducts 1211 and a transverse tube, and the transverse tube is connected to the two single air outlet ducts 1211 to form an H-shaped structure, and the flexible tube 13 is connected to the transverse tube. This structure can ensure the air outlet effect of multiple second air outlets 1211a, but a longer flexible tube 13 needs to be set.

[0047] In order to ensure that the single air outlet 1211 can rotate to adjust the angle of the second air outlet 1211a, the side tube of the U-shaped tube 1212 and the single air outlet 1211 are rotatably connected. For example, a threaded connection is adopted, and the U-shaped tube 1212 and the single air outlet 1211 can be provided with a longer thread to achieve the connection between the single air outlet 1211 and the side tube of the U-shaped tube 1212 without affecting the connection during rotation. Of course, in other embodiments, the side tube and the single air outlet 1211 can be connected by a sealed sleeve or a rotary joint, so that the air outlet angle of the second air outlet 1211a can be adjusted by rotation to adapt to the arrangement and number of flower baskets to ensure drying efficiency.

[0048] The single air outlet duct 1211 and the first air outlet duct 111 are both straight pipes, and the single air outlet duct 1211 and the first air outlet duct 111 are fixed by a plurality of U-shaped fixing clips 14. That is, each single air outlet duct 1211 can be fixed to the cover plate 12 by a plurality of U-shaped fixing clips 14, and a plurality of U-shaped fixing clips 14 corresponding to each single air outlet duct 1211 are arranged on the cover plate 12 at intervals along the second direction, and the single air outlet duct 1211 is inserted into the U-shaped groove of the U-shaped fixing clip 14; each first air outlet duct 111 is fixed to the inner side wall of the box body 11 by a plurality of U-shaped fixing clips 14, and a plurality of U-shaped fixing clips 14 corresponding to each first air outlet duct 111 are arranged on the inner side wall of the box body 11 at intervals along the second direction, and the first air outlet duct 111 is inserted into the U-shaped groove of the U-shaped fixing clip 14.

[0049] In order to realize that the second air outlet 1211a can stop blowing when the cover plate 12 opens the top opening of the box body 11 or the second air outlet 1211a can automatically blow when the cover plate 12 closes the top opening of the box body 11, a first pneumatic valve is provided on the flexible tube 13. When the cover plate 12 is opened, the first pneumatic valve is used to block the flexible tube 13 to prevent the second air outlet 1211a from continuously blowing when the cover plate 12 is opened, so as to avoid waste or affect the work of the operator; when the cover plate 12 is closed, the first pneumatic valve controls the flexible tube 13 to be turned on, so as to ensure the normal drying of the semi-finished battery, and the structural design is more reasonable. It is worth noting that the first pneumatic valve can be set on other pipelines flowing to the second air outlet 1211a, and its main function is to enable the second air outlet 1211a to selectively blow air or not according to production needs.

[0050] It should be noted that after the semi-finished batteries in the box body 11 are dried, the cover 12 needs to be opened to take them out and put in the next group of semi-finished batteries. During this process, the second air outlet 1211a stops blowing air, and the first air outlet continues to blow air to ensure that the temperature and humidity environment in the box body 11 remains unchanged, so as to facilitate the drying of the next group of semi-finished batteries.

[0051] The diameter size range of the first air outlet and the second air outlet 1211a is 0.2-1 cm, and preferably both are holes with a diameter of 0.5 cm.

[0052] Refer to Figure 1 The circulation system also includes an air inlet pipe 5 and a primary filter element 6. One end of the air inlet pipe 5 is connected to the gas conveyor 2, and the other end of the air inlet pipe 5 is connected to the air outlet connection port of the primary filter element 6. The air inlet connection port of the primary filter element 6 is connected to the outside world. When the gas conveyor 2 is working, the outside air can also enter the air inlet pipe 5 through the primary filter element 6, and then enter the circulation air duct 3 through the air inlet pipe 5, so that the circulation air duct 3 can continuously input the outside air, and the circulation temperature can be adjusted as needed.

[0053] The circulation system further includes a heating element 7, which is disposed on the circulation air duct 3 and located between the gas conveyor 2 and the high-efficiency filter element 4. The heating element 7 can heat the gas in the circulation air duct 3 to achieve a better drying effect.

[0054] The circulation system also includes an exhaust pipe 8 and a second pneumatic valve 9. The exhaust pipe 8 is connected to the circulation pipe 3 and is located between the gas conveyor 2 and the heating element 7. The second pneumatic valve 9 is arranged at the connection between the circulation pipe 3 and the exhaust pipe 8. The second pneumatic valve 9 is used to circulate the gas between the circulation pipe 3 and the box body 11 or to discharge the gas through the exhaust pipe 8. That is, when the gas circulates in the circulation pipe 3 and the box body 11, the second pneumatic valve 9 controls the conduction of the circulation pipe 3 and controls the blockage of the exhaust pipe 8 at the same time; when the gas is discharged through the exhaust pipe 8, the second pneumatic valve 9 controls the conduction of the exhaust pipe 8 and controls the blockage of the circulation pipe 3 at the same time. This structure can discharge the exhaust gas through the exhaust pipe 8.

[0055] Furthermore, one end of the exhaust pipe 8 that is away from the circulating air pipe 3 can be connected to the peripheral pipe 10, and the exhaust gas enters the peripheral pipe 10 through the exhaust pipe 8 and is discharged.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Drying device, characterized in that: include: A drying box (1), comprising a box body (11) and a cover plate (12), wherein the box body (11) is used to store products to be dried, and the cover plate (12) is used to open and close the top opening of the box body (11); two inner side walls of the box body (11) opposite to each other along a first direction are each provided with a first air outlet pipe (111), wherein the first air outlet pipe (111) is provided with a plurality of first air outlets spaced apart along its axial direction and facing the products to be dried, wherein the cover plate (12) is provided with a second air outlet pipe (121), wherein the second air outlet pipe (121) is provided with a plurality of second air outlets spaced apart along its axial direction and facing the products to be dried, and wherein a return port (112) is provided at the bottom of the box body (11); A circulation system, one end of which is in communication with the return port (112), and the other end of which is in communication with both the first air outlet pipe (111) and the second air outlet pipe (121).

2. The drying device according to claim 1, characterized in that: The second air outlet duct (121) comprises a plurality of single air outlet ducts (1211) spaced apart along the first direction, the plurality of single air outlet ducts (1211) being distributed above both sides of the product to be dried along the first direction and being respectively connected to the circulation system, and the axis of the second air outlet (1211a) on the single air outlet duct (1211) is not perpendicular to the cover plate (12).

3. The drying device according to claim 2, characterized in that: The second air outlet pipe (121) further comprises a U-shaped pipe (1212), the mutually parallel side pipes of the U-shaped pipe (1212) being connected in a one-to-one correspondence with the single air outlet pipe (1211), and the bottom pipe of the U-shaped pipe (1212) being connected with the circulation system.

4. The drying device according to claim 3, characterized in that: The side pipe and the single air outlet pipe (1211) are rotatably connected.

5. The drying device according to claim 1, characterized in that: Two cover plates (12) are provided, and each of the cover plates (12) is provided with the second air outlet pipe (121); and / or The diameter size range of the first air outlet and / or the second air outlet (1211a) is 0.2-1 cm.

6. The drying device according to any one of claims 1 to 5, characterized in that: The circulation system comprises a gas conveyor (2) and a circulation air duct (3); one end of the circulation air duct (3) is connected to the return port (112); the first air outlet duct (111) and the second air outlet duct (121) are both connected to the other end of the circulation air duct (3); and the gas conveyor (2) is arranged on the circulation air duct (3).

7. The drying device according to claim 6, characterized in that: The circulation system further comprises a high-efficiency filter element (4); the first air outlet pipe (111) and the second air outlet pipe (121) are both connected to the air outlet connection port of the high-efficiency filter element (4); and the circulation air pipe (3) is connected to the air inlet connection port of the high-efficiency filter element (4).

8. The drying device according to claim 7, characterized in that: A flexible tube (13) is provided between the second air outlet pipe (121) and the high-efficiency filter element (4).

9. The drying device according to claim 8, characterized in that: It also comprises a first pneumatic valve, wherein the first pneumatic valve is used to open or close the flexible tube (13).

10. The drying device according to claim 6, characterized in that: The circulatory system further comprises: an air inlet pipe (5) and a primary filter element (6), wherein one end of the air inlet pipe (5) is connected to the gas conveyor (2), the other end of the air inlet pipe (5) is connected to the air outlet connection port of the primary filter element (6), and the air inlet connection port of the primary filter element (6) is connected to the outside; and / or a heating element (7), wherein the heating element (7) is arranged on the circulating air duct (3); and / or An exhaust pipe (8) and a second pneumatic valve (9), wherein the exhaust pipe (8) is connected to the circulating air pipe (3), and the second pneumatic valve (9) is used to control the conduction or blocking of the circulating air pipe (3) and the exhaust pipe (8).

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