Hot air circulating device of curing oven

Abstract

According to the hot air circulation device of the curing oven, one end of a shell is open, a wind wheel, a double-air-outlet volute, a mixing box and a heating assembly are arranged in a first space formed by the shell, the wind wheel is arranged in a volute cavity of the double-air-outlet volute, and an air outlet of the double-air-outlet volute is connected with the mixing box; a first-stage spoiler is arranged at the position, corresponding to the air outlet, in the mixing box body, a second-stage spoiler is arranged at the opening end of the mixing box body, and the heating assembly is arranged between the double-air-outlet volute and the mixing box body; during working, the wind wheel sucks gas heated by the heating assembly, the gas passes through the double-air-outlet volute and then is exhausted into the mixing box body through the air outlet, the gas is decelerated through the first-stage spoiler and mixed in the mixing box body, and then the gas is rectified through the second-stage spoiler and then exhausted to a workpiece to be cured. Compared with the prior art, the hot air circulation device of the curing oven is provided with the two-stage spoilers and the mixing box body, so that the gas speed is reduced, the gas is fully mixed and then makes contact with a workpiece to be cured, and the curing quality can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of curing equipment in the electronic power industry, and in particular to a hot air circulation device for a curing furnace. Background Art

[0002] Curing furnaces are important equipment for preparing electronic components. They use heating and curing to strengthen the bonding between materials. They heat objects to undergo physical or chemical reactions, solidify materials, and achieve structural changes. Curing furnaces are widely used in the production processes of heating parts, curing resins, and drying glue in various industries such as 3C, new energy, and semiconductors. The curing furnaces in the prior art have the problem of excessive air flow rate, which may affect the curing quality of the product during the curing process. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a hot air circulation device for a curing furnace, comprising:

[0004] A housing, wherein the housing has a first open end and an interior of the housing forms a first space;

[0005] A hot air motor, the hot air motor is arranged on a side of the housing away from the first opening end, a driving shaft of the hot air motor passes through the housing and extends into the first space, and is connected to a wind wheel;

[0006] A double-outlet volute, the double-outlet volute is arranged in the first space, the double-outlet volute has a volute cavity; the wind wheel is arranged in the volute cavity; the double-outlet volute has an air inlet and two air outlets connected to the volute cavity; the two air outlets face the first opening end side;

[0007] A mixing box, the mixing box is arranged on the side of the air outlet; the mixing box has a second opening end, the second opening end is close to the first opening end; two mixing inlets facing the two air outlets are opened on the box wall of the mixing box away from the second opening end;

[0008] a heating component, the heating component being disposed in the first space and being used for heating the gas in the first space;

[0009] A spoiler assembly, the spoiler assembly comprising two primary spoilers and one secondary spoiler; the two primary spoilers are arranged in the mixing box and respectively face the two mixing inlets; the secondary spoiler covers the second opening end; and a plurality of through holes are provided on the primary spoiler and the secondary spoiler.

[0010] According to the technical solution provided in certain embodiments of the present application, a first cover shell is arranged in the first space, and the first cover shell has an open end; the open end is fixed in the outer shell at one end close to the hot air motor; a shielding cover ring is arranged in the first cover shell, and the shielding cover ring is sleeved on the outer periphery of the drive shaft and fixed on the first cover shell; the free end of the drive shaft passes through the side of the first cover shell away from the open end; a first annular space is formed between the first cover shell and the shielding cover ring; and the first annular space is filled with thermal insulation material.

[0011] According to the technical solution provided in certain embodiments of the present application, a shielding cover is arranged inside the shielding cover ring, and the shielding cover ring serves to limit the shielding cover; a sleeve is fixedly connected to the inside of the shielding cover; the sleeve is sleeved on the outside of the driving shaft; a second annular space is formed between the shielding cover and the sleeve; and the second annular space is filled with thermal insulation material.

[0012] According to the technical solution provided in certain embodiments of the present application, the shielding cover is a cylindrical body with an opening at one end; a connecting hole is provided at the bottom of the shielding cover; the end of the sleeve away from the hot air motor passes through the connecting hole and is threadedly connected with a locking nut; an annular protrusion is provided on the side wall of the sleeve; the annular protrusion and the locking nut are respectively abutted against both sides of the bottom wall of the shielding cover.

[0013] According to the technical solution provided in certain embodiments of the present application, the first cover shell is connected to the mixing box body through a connecting frame, and the connecting frame provides an installation space for the wind wheel, the double air outlet volute and the heating assembly.

[0014] According to the technical solution provided in certain embodiments of the present application, a mounting bracket is arranged on the side wall of the connecting frame; the heating assembly is fixed on the mounting bracket; the heating assembly includes a porcelain tube, on which a heating wire is wound; a plurality of porcelain rings are also sleeved on the porcelain tube along its own length direction; and the porcelain ring is fixedly connected to the mounting bracket.

[0015] According to the technical solutions provided in certain embodiments of the present application, the outer shell includes a detachably connected side panel and a cover panel; the side panel surrounds the cover panel to form the first space; and the cover panel is fixedly connected to the first cover shell.

[0016] According to the technical solutions provided in some embodiments of the present application, a pull-out handle is provided on the side of the cover plate away from the first space; and a sealing strip is provided at the connection between the cover plate and the side plate.

[0017] According to the technical solution provided in certain embodiments of the present application, a reinforcing plate is arranged on the side of the cover plate close to the first space; an inner cover protection plate is arranged inside the side of the first cover shell away from the open end; and a support column is arranged between the reinforcing plate and the inner cover protection plate.

[0018] According to the technical solution provided in certain embodiments of the present application, the cover plate, the reinforcement plate, the inner cover protection plate and the shell wall of the first cover shell away from the open end are all provided with circular holes of the same size and coaxial; the center line of the circular hole coincides with the center line of the drive shaft; the aperture of the circular hole is smaller than the diameter of the shielding cover ring and can allow the shielding cover and the wind wheel to pass through; a fixing plate is provided on the side of the cover plate away from the first space; the fixing plate covers the center circular hole of the cover plate and is connected to the support column by bolts; the hot air motor is fixed on the side of the fixing plate away from the first space.

[0019] Compared with the prior art, the present application has the following beneficial effects: the present application provides a hot air circulation device for a curing furnace, which is configured by setting an outer shell to be open at one end, arranging a wind wheel, a double-outlet volute, a mixing box and a heating component in a first space formed by the outer shell, and the wind wheel is arranged in the volute cavity of the double-outlet volute, the air outlet of the double-outlet volute is connected to the mixing box, a primary spoiler is arranged at a position corresponding to the air outlet in the mixing box, a secondary spoiler is arranged at the open end of the mixing box, and the heating component is arranged between the double-outlet volute and the mixing box; when working, the heating component continuously heats the gas in the first space, the hot air is sucked in by the center of the wind wheel, discharged from the air outlet after passing through the double-outlet volute, and firstly decelerated by two primary spoilers after entering the interior of the mixing box through two mixing inlets of the mixing box, and then the hot air is evenly mixed in the box and then rectified by the secondary spoiler and slowly discharged to the workpiece to be cured, the low-temperature gas in the space where the workpiece to be cured is located flows to the heating component through the gap between the mixing box and the outer shell, and is then sucked in by the wind wheel to form a circulation after being heated. Compared with the prior art, the hot air circulation device of the curing furnace provided in the present application is provided with a two-stage spoiler and a mixing box, so that the gas velocity is reduced and the gas is fully mixed and the temperature is evenly distributed before contacting the workpiece to be cured, which can effectively improve the curing quality; the gas forms a cycle inside the hot air circulation device of the curing furnace, the temperature rises faster, and it is easier to meet the process requirements required for curing.

[0020] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be realized without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in a specific embodiment that does not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the appearance of a hot air circulation device for a curing furnace provided in an embodiment of the present application;

[0023] Figure 2 An exploded diagram of a hot air circulation device for a curing furnace provided in an embodiment of the present application;

[0024] Figure 3 A schematic cross-sectional view of a hot air circulation device for a curing furnace provided in an embodiment of the present application;

[0025] Figure 4 This is an enlarged schematic diagram of the heating component.

[0026] The text annotations in the figure represent:

[0027] 120. Outer shell; 100. Hot air motor; 101. Wind wheel; 102. Double air outlet volute; 103. Mixing box; 104. Heating component; 105. First cover shell; 106. Shielding cover ring; 107. Shielding cover; 108. Connecting frame; 109. Cover plate; 110. Pull-out handle; 111. Reinforcement plate; 112. Inner cover protection plate; 113. Support column; 114. Fixing plate; 115. Sleeve; 1031. Primary spoiler; 1032. Secondary spoiler; 1081. Mounting bracket; 1082. Ceramic ring; 1083. Ceramic tube; 1084. Heating wire. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present application. Specifically, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] As mentioned in the background technology, in view of the problems in the prior art, this embodiment provides a hot air circulation device for a curing furnace, comprising:

[0031] A housing 120, wherein the housing 120 has a first opening end, and an interior of the housing 120 forms a first space;

[0032] A hot air motor 100, wherein the hot air motor 100 is disposed on a side of the housing 120 away from the first opening end, a driving shaft of the hot air motor 100 passes through the housing 120 and extends into the first space, and is connected to a wind wheel 101;

[0033] A double air outlet volute 102, the double air outlet volute 102 is arranged in the first space, the double air outlet volute 102 has a volute cavity; the wind wheel 101 is arranged in the volute cavity; the double air outlet volute 102 has an air inlet and two air outlets connected to the volute cavity; the two air outlets face the first opening end side;

[0034] A mixing box 103, the mixing box 103 is arranged on the side of the air outlet; the mixing box 103 has a second opening end, the second opening end is close to the first opening end; two mixing inlets facing the two air outlets are opened on the box wall of the mixing box 103 away from the second opening end;

[0035] A heating component 104, wherein the heating component 104 is disposed in the first space and is used to heat the gas in the first space;

[0036] A spoiler assembly, the spoiler assembly includes two primary spoilers 1031 and one secondary spoiler 1032; the two primary spoilers 1031 are arranged in the mixing box 103 and are respectively opposite to the two mixing inlets; the secondary spoiler 1032 covers the second opening end; and a plurality of through holes are provided on the primary spoiler 1031 and the secondary spoiler 1032.

[0037] Please refer to Figure 1 The shell 120 is a rectangular shell with one end open, and the first open end faces the workpiece to be cured; the shell 120 separates the remaining internal components of the hot air circulation device of the curing furnace from the environment outside the furnace, and forms a closed environment relative to the environment outside the furnace, thereby reducing the air circulation and heat exchange between the shell 120 and the environment outside the furnace. The hot air motor 100 is a power element of the device, including a power body and a drive shaft connected to the power body. A conical cover is arranged around one side of the power body close to the drive shaft, and a plurality of heat dissipation holes are arranged on the conical cover. The small-diameter end of the conical cover is connected to the power body, and the large-diameter end of the conical cover is provided with three ear plates, and the ear plates are used to be fixed to the shell 120.

[0038] Please refer to Figure 2 The wind wheel 101 is composed of a hub and blades arranged around the hub; the double-outlet volute 102 is a shell having a double-helix structure air duct and a circular through hole at the center; the central through hole of the double-outlet volute 102 is used to set the wind wheel 101; the circular hole at one end of the double-outlet volute 102 away from the hot air motor 100 is an air inlet, and the end of the double-helix structure air duct is two air outlets; the two air outlets are connected to the mixing box 103; the heating component 104 is arranged between the double-outlet volute 102 and the mixing box 103; the mixing box 103 is a rectangular structure box, which is away from the hot air motor 100. One end of the double-outlet volute 102 is open, namely the second open end. The mixing box 103 is a space for sufficient gas mixing. Two lining columns are arranged on the inner wall of the mixing box 103 near the two mixing inlets. The lining columns are used to install the first-level spoiler 1031. The two first-level spoilers 1031 are respectively arranged opposite to the two air outlets; the second-level spoiler 1032 covers the second open end of the mixing box 103. The second-level spoiler 1032 is also called a rectifier, on which a plurality of through holes are evenly arranged. Its function is to slowly and evenly discharge the evenly mixed gas in the mixing box 103.

[0039] When in use, the hot air motor 100 and the heating component 104 are started, the heating component 104 continuously heats the gas in the first space, and the hot air motor 100 drives the wind wheel 101 to rotate through the driving shaft; the wind wheel 101 generates centrifugal force when rotating, and the heated gas is axially sucked into the wind wheel 101 through the air inlet, and is accelerated by the wind wheel 101 and radially discharged into the double-outlet volute 102; the gas is guided by the two air ducts of the double-outlet volute 102 and then discharged to the air outlet, and the gas is discharged from the outlet After being discharged from the air outlet, the air enters the mixing box 103 through the mixing inlet, and is first disturbed by the first-level spoiler 1031 and then reduced in velocity. After the deceleration, the gas is mixed in the mixing box 103; the mixed gas is rectified by the second-level spoiler 1032 and then discharged slowly and evenly, and blown toward the workpiece to be cured; the gas with a lower temperature in the space where the workpiece to be cured is located continues to flow into the first space, and is heated by the heating component 104 and then sucked into the wind wheel 101, so that the gas forms a cycle in the hot air circulation device of the curing furnace.

[0040] By setting the first-level spoiler 1031, the gas flow rate can be significantly reduced to prevent the workpiece to be cured from being blown over; and the gas is fully mixed in the mixing box 103 and then discharged after being rectified by the second-level spoiler 1032, which can ensure that each part of the discharged gas has the same temperature, so that the workpiece to be cured can be heated evenly and the curing quality is improved; at the same time, the circulating gas can quickly increase the temperature in the hot air circulation device of the curing furnace, making it easier to meet the process requirements of the workpiece to be cured.

[0041] In a preferred embodiment, a first cover shell 105 is arranged in the first space, and the first cover shell 105 has an open end; the open end is fixed in the outer shell 120 at one end close to the hot air motor 100; a shielding ring 106 is arranged in the first cover shell 105, and the shielding ring 106 is sleeved on the outer periphery of the drive shaft and fixed on the first cover shell 105; the free end of the drive shaft passes through the side of the first cover shell 105 away from the open end; a first annular space is formed between the first cover shell 105 and the shielding ring 106; and the first annular space is filled with thermal insulation material.

[0042] like Figure 2 As shown, the first cover shell 105 is a rectangular cover shell with an open end, the shielding cover ring 106 is a hollow cylindrical structure with a plurality of through holes on its side wall, and the first annular space formed between the first cover shell 105 and the shielding cover ring 106 is filled with thermal insulation material to reduce heat loss, that is, reduce heat loss during the curing process. Optionally, the thermal insulation material mentioned in this embodiment can be thermal insulation cotton.

[0043] In a preferred embodiment, a shielding cover 107 is arranged inside the shielding cover ring 106, and the shielding cover ring 106 serves to limit the shielding cover 107; a sleeve 115 is fixedly connected to the inside of the shielding cover 107; the sleeve 115 is sleeved on the outside of the driving shaft; a second annular space is formed between the shielding cover 107 and the sleeve 115; and the second annular space is filled with thermal insulation material.

[0044] like Figure 3 As shown, the shielding cover 107 is a hollow cylindrical cover, and its outer diameter is slightly smaller than the inner diameter of the shielding cover ring 106, so that the shielding cover ring 106 can limit the shielding cover 107. The second annular space is filled with thermal insulation material to reduce heat loss. The shielding cover ring 106 isolates the shielding cover 107 from the thermal insulation material in the first cover shell 105 to prevent the shielding cover 107 from rubbing against the thermal insulation material.

[0045] In a preferred embodiment, the shielding cover 107 is a cylindrical body with an opening at one end; a connecting hole is provided at the bottom of the shielding cover 107; the end of the sleeve 115 away from the hot air motor 100 passes through the connecting hole and is threadedly connected with a locking nut; an annular protrusion is provided on the side wall of the sleeve 115; the annular protrusion and the locking nut are respectively abutted against both sides of the bottom wall of the shielding cover 107.

[0046] like Figure 3 As shown, the free end of the sleeve 115 is provided with an external thread, which is threadedly connected to the locking nut. By rotating the locking nut, the bottom of the shielding cover 107 can be clamped between the locking nut and the annular protrusion, so that the shielding cover 107 and the sleeve 115 are fixed; the sleeve 115 and the locking nut together form a protective device, which can remain stationary when the drive shaft rotates. The sleeve 115 can separate the drive shaft from the thermal insulation material in the shielding cover 107, to prevent the drive shaft from rotating when the hot air motor 100 is working, causing the thermal insulation material to be displaced, thereby affecting the thermal insulation effect.

[0047] In a preferred embodiment, the first housing 105 is connected to the mixing box 103 via a connecting frame 108, and the connecting frame 108 provides an installation space for the wind wheel 101, the double air outlet volute 102 and the heating assembly 104; Figure 2 As shown, the connection frame 108 can also increase the stability and strength of the overall structure.

[0048] In a preferred embodiment, a mounting bracket 1081 is provided on the side wall of the connecting frame 108; the heating component 104 is fixed on the mounting bracket 1081; the heating component includes a porcelain tube 1083, on which a heating wire 1084 is wound; a plurality of porcelain rings 1082 are also sleeved on the porcelain tube 1083 along its own length direction; the porcelain rings 1082 are fixedly connected to the mounting bracket 1081.

[0049] like Figure 4 As shown, two upper and lower groups of the ceramic rings 1082 are fixed on the mounting bracket 1081, and a ceramic tube 1083 passes through each group of the ceramic rings 1082. The heating wire 1084 is spirally wound around the ceramic tube 1083. The spiral structure can increase the heating area and improve the heating efficiency. The ceramic rings 1082 and the ceramic tube 1083 prevent the heating wire 1084 from directly contacting the mounting bracket 1081, thereby reducing heat loss and saving energy.

[0050] In a preferred embodiment, the housing 120 includes a detachably connected side plate and a cover plate 109; the side plate surrounds the cover plate 109 to form the first space; the cover plate 109 is fixedly connected to the first housing 105; Figure 2 As shown, in subsequent use, the remaining parts of the hot air circulation device of the curing furnace except the side plate can be taken out for easy maintenance.

[0051] In a preferred embodiment, a pull-out handle 110 is provided on the side of the cover plate 109 away from the first space; a sealing strip is provided at the connection between the cover plate 109 and the side plate; Figure 2 As shown, the pull-out handle 110 can provide a fulcrum for maintenance personnel when disassembling, making it convenient to take out the part inside the side panel; further, the pull-out handle 110 has a hinge structure and is in a folded state when in working state. When maintenance is needed, the pull-out handle 110 is pulled out to provide a fulcrum for disassembly for maintenance personnel; the sealing strip can maintain the internal circulation of the heated gas inside the furnace body to prevent heat loss.

[0052] In a preferred embodiment, a reinforcing plate 111 is provided on the side of the cover plate 109 close to the first space; an inner cover protection plate 112 is provided inside the side of the first cover shell 105 away from the open end; and a support column 113 is provided between the reinforcing plate 111 and the inner cover protection plate 112.

[0053] like Figure 2As shown, the reinforcing plate 111 can increase the rigidity of the cover plate 109. The reinforcing plate 111 and the inner cover protection plate 112 also serve as carriers for installing the support column 113. The support column 113 can form a stable space inside the first cover shell 105, which is convenient for installing the shielding cover 107 and filling with thermal insulation materials.

[0054] In a preferred embodiment, the cover plate 109, the reinforcement plate 111, the inner cover protection plate 112 and the shell wall of the first cover shell 105 away from the open end are all provided with circular holes of the same size and coaxial; the center line of the circular hole coincides with the center line of the drive shaft; the aperture of the circular hole is smaller than the diameter of the shielding cover ring 106 and can allow the shielding cover 107 and the wind wheel 101 to pass through; a fixing plate 114 is provided on the side of the cover plate 109 away from the first space; the fixing plate 114 covers the center circular hole of the cover plate and is connected to the support column 113 by bolts; the hot air motor 100 is fixed on the side of the fixing plate 114 away from the first space.

[0055] like Figure 2 As shown, the ear plate of the hot air motor 100 is fixed to the fixing plate 114 by bolts. The fixing plate 114 can play a buffering role, but also prevents the bolts from tightening and causing deformation of the cover plate 109 sheet metal or surface scratches. By removing the fixing plate 114, the hot air motor 100 and the wind wheel 101 can be taken out separately, which is convenient for subsequent maintenance operations.

[0056] The hot air circulation device for a curing furnace provided in the present application achieves the effect of uniform discharge of air after full mixing by setting a multi-stage turbulence form, so that the workpiece to be cured in the curing furnace is heated more evenly, the temperature difference of each surface of the workpiece is reduced, and the curing quality is improved; by setting a reasonable circulation structure, the gas forms an internal circulation in the hot air circulation device of the curing furnace, ensuring that the temperature difference of each part of the gas is small, enhancing the uniformity of mixing while also improving the heating efficiency, the circulating gas can make the inside of the hot air circulation device of the curing furnace quickly heat up, and it is easier to meet the process requirements required for curing; by adding thermal insulation materials to prevent heat loss, the goal of high efficiency and energy saving is achieved; by designing a reasonable mutual structure for each part, the characteristics of the device that is easy to disassemble and easy to maintain are achieved.

[0057] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A hot air circulation device for a curing furnace, characterized in that: include: A housing (120), wherein the housing (120) has a first open end, and the interior of the housing (120) forms a first space; A hot air motor (100), the hot air motor (100) being arranged on a side of the housing (120) away from the first opening end, a driving shaft of the hot air motor (100) passing through the housing (120) and extending into the first space, and being connected to a wind wheel (101); A double air outlet volute (102), the double air outlet volute (102) being arranged in the first space, the double air outlet volute (102) having a volute cavity; the wind wheel (101) being arranged in the volute cavity; the double air outlet volute (102) having an air inlet and two air outlets communicating with the volute cavity; the two air outlets facing the first opening end side; A mixing box (103), the mixing box (103) being arranged on the side of the air outlet; the mixing box (103) having a second opening end, the second opening end being close to the first opening end; two mixing inlets facing the two air outlets are provided on a box wall of the mixing box (103) on a side away from the second opening end; A heating component (104), the heating component (104) being disposed in the first space and used for heating the gas in the first space; A spoiler assembly, the spoiler assembly comprising two primary spoilers (1031) and one secondary spoiler (1032); the two primary spoilers (1031) are arranged in the mixing box (103) and are respectively opposite to the two mixing inlets; the secondary spoiler (1032) covers the second opening end; and a plurality of through holes are provided on the primary spoiler (1031) and the secondary spoiler (1032).

2. The hot air circulation device for a curing furnace according to claim 1, characterized in that: A first cover shell (105) is arranged in the first space, and the first cover shell (105) has an open end; the open end is fixed in the outer shell (120) at one end close to the hot air motor (100); a shielding ring (106) is arranged in the first cover shell (105), and the shielding ring (106) is sleeved on the outer periphery of the driving shaft and fixed on the first cover shell (105); the free end of the driving shaft passes through the side of the first cover shell (105) away from the open end; a first annular space is formed between the first cover shell (105) and the shielding ring (106); the first annular space is filled with thermal insulation material.

3. The hot air circulation device for a curing furnace according to claim 2, characterized in that: A shielding cover (107) is arranged inside the shielding cover ring (106), and the shielding cover ring (106) serves to limit the shielding cover (107); a sleeve (115) is fixedly connected to the inside of the shielding cover (107); the sleeve (115) is sleeved on the outside of the driving shaft; a second annular space is formed between the shielding cover (107) and the sleeve (115); and the second annular space is filled with thermal insulation material.

4. The hot air circulation device for a curing furnace according to claim 3, characterized in that: The shielding cover (107) is a cylindrical body with an opening at one end; a connecting hole is provided at the bottom of the shielding cover (107); the end of the sleeve (115) away from the hot air motor (100) passes through the connecting hole and is threadedly connected with a locking nut; an annular protrusion is provided on the side wall of the sleeve (115); the annular protrusion and the locking nut are respectively abutted against two sides of the bottom wall of the shielding cover (107).

5. The hot air circulation device for a curing furnace according to claim 4, characterized in that: The first cover shell (105) is connected to the mixing box (103) via a connecting frame (108), and the connecting frame (108) provides installation space for the wind wheel (101), the double air outlet volute (102) and the heating component (104).

6. The hot air circulation device for a curing furnace according to claim 5, characterized in that: A mounting bracket (1081) is arranged on the side wall of the connection frame (108); the heating component (104) is fixed on the mounting bracket (1081); the heating component comprises a porcelain tube (1083), and a heating wire (1084) is wound around the porcelain tube (1083); a plurality of porcelain rings (1082) are also sleeved on the porcelain tube (1083) along its own length direction; the porcelain rings (1082) are fixedly connected to the mounting bracket (1081).

7. The hot air circulation device for a curing furnace according to claim 5, characterized in that: The outer shell (120) comprises a detachably connected side plate and a cover plate (109); the side plate surrounds the cover plate (109) to form the first space; and the cover plate (109) is fixedly connected to the first cover shell (105).

8. The hot air circulation device for a curing furnace according to claim 7, characterized in that: A pull-out handle (110) is provided on a side of the cover plate (109) away from the first space; and a sealing strip is provided at the connection between the cover plate (109) and the side plate.

9. The hot air circulation device for a curing furnace according to claim 7, characterized in that: A reinforcing plate (111) is arranged on a side of the cover plate (109) close to the first space; an inner cover protection plate (112) is arranged inside a side of the first cover shell (105) away from the open end; and a support column (113) is arranged between the reinforcing plate (111) and the inner cover protection plate (112).

10. The hot air circulation device for a curing furnace according to claim 9, characterized in that: The cover plate (109), the reinforcing plate (111), the inner cover protection plate (112) and the shell wall of the first cover shell (105) away from the open end are all provided with circular holes of the same size and coaxial; the center line of the circular hole coincides with the center line of the drive shaft; the aperture of the circular hole is smaller than the diameter of the shielding cover ring (106) and can allow the shielding cover (107) and the wind wheel (101) to pass through; a fixing plate (114) is provided on the side of the cover plate (109) away from the first space; the fixing plate (114) covers the center circular hole of the cover plate (109) and is connected to the support column (113) by bolts; the hot air motor (100) is fixed on the side of the fixing plate (114) away from the first space.

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