A circulating baking device

Abstract

The present application relates to electronic product processing technical field, especially be a kind of circulating baking device, including box, drying unit and with the hinged setting box door of box, still include: air outlet mechanism, number is several and is set on the side wall in the box interior;The present application is by adjustable air outlet unit that is made of aperture plate, air outlet pipe, T column and connecting assembly, utilize the structure of connecting assembly similar universal ball joint to make each air outlet pipe can independently swing, and adjusting unit is then driven frame up and down movement by first electric hydraulic rod, second electric hydraulic rod drives horizontal movement of moving seat, and then through the sliding fit of connecting piece and T column, the pitch and horizontal orientation of all air outlet pipe outlet end are accurately controlled, the design makes the dense arrangement of multiple-hole gas flow change from fixed to dynamic adjustable, can adjust airflow coverage angle and path according to the height, shape and placement mode of the baked workpiece, effectively penetrate the gap between workpiece.

Description

Technical Field

[0001] This invention relates to the field of electronic product processing technology, specifically a circulating baking device. Background Technology

[0002] The circulating air cleanroom oven, also known as a dust-free drying oven, is a specialized high-temperature purification environment equipment designed for electronic product processing. Its core technology lies in the closed-loop circulation and continuous purification of air within the chamber through a high-temperature resistant, high-efficiency air filter, achieving a cleanliness level of up to Class 100, effectively preventing dust contamination of precision electronic components. The equipment employs a hot air circulation system and PID intelligent temperature control technology to ensure uniform and stable temperature, making it suitable for precision baking, drying, curing, and aging testing of semiconductors, LCD components, and other products. Some models can also be filled with nitrogen to provide an oxidation-free heat treatment environment for sensitive components.

[0003] The airflow from the fan is concentrated, high-speed and unstable. If it is blown directly into the chamber from a large opening, it will form a strong jet. This will result in a low temperature and high wind speed in the area directly impacted by the airflow, while other areas will become dead zones with extremely large temperature differences. Therefore, the air outlet inside the oven is made of multiple holes. The porous structure can effectively dampen and organize the airflow and suppress the generation of large-scale eddies.

[0004] The circulating air clean oven uses fixed multi-hole air outlets, which can organize the airflow, but also brings significant limitations. Since the direction of the holes cannot be adjusted, the airflow is ejected at a fixed angle, and its coverage and path are fixed. When facing workpieces of different heights, shapes or arrangements (such as vertical circuit boards or densely placed components), the airflow in the fixed direction is easily blocked, forming airflow dead zones that are difficult to reach behind the workpieces or in the gaps, resulting in insufficient heat exchange in these areas. Summary of the Invention

[0005] The purpose of this invention is to provide a circulating baking apparatus to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a circulating baking device, comprising a housing, a drying unit, and a door hinged to the housing, and further comprising: The air outlet mechanism consists of several units located on the side wall inside the housing. The air outlet mechanism comprises an adjustable air outlet unit, a cover, a uniform air delivery unit, and an adjustment unit.

[0007] Preferably, the adjustable air outlet unit includes: The perforated plate is plate-shaped and has multiple holes on its surface; the cover is bolted to the perforated plate. There are several air outlet pipes, and their outlet ends pass through the holes on the surface of the perforated plate; The T-shaped column is composed of a cylinder with protrusions on both sides, and the T-shaped column is welded to the surface of the air outlet duct; A connecting component for providing the air outlet duct with the conditions for deflection; A rubber sleeve is fixed inside the hole on the surface of the perforated plate, and the air outlet pipe passes through the rubber sleeve.

[0008] Preferably, the connecting assembly consists of a connecting rod, a hemispherical groove, and a sphere. One end of the connecting rod is bolted to the orifice plate, and the other end of the connecting rod is welded to the hemispherical groove. The sphere is fixed to the surface of the air outlet pipe and movably connected to the inner wall of the hemispherical groove.

[0009] Preferably, the adjustment unit includes: The frame is disposed inside the housing; The connector is in contact with the surface of the T-post; A movable seat is located below the frame; The first heat insulation shell is bolted to the top of the movable base; The first electric hydraulic rod is fixed inside the first heat insulation shell, and its output shaft extends to the outside of the first heat insulation shell and is bolted to the frame, for controlling the up and down position of the frame. The second electro-hydraulic rod has its output shaft bolted to the movable seat and is used to control the horizontal position of the movable seat. The second heat insulation shell is disposed on the outside of the second electro-hydraulic rod, and the second heat insulation shell is bolted to the inner wall of the cover. The heat dissipation assembly is used to generate airflow to dissipate heat from the two sets of electro-hydraulic rods inside the first and second heat insulation shells.

[0010] Preferably, the heat dissipation assembly consists of connecting pipes, inlet and outlet shrouds, and a fan. There are two sets of inlet and outlet shrouds. The connecting pipes are composed of multiple sections of pipe that connect the first heat insulation shell, the second heat insulation shell, and the inlet and outlet shrouds to each other. The fan is bolted to the inside of the inlet and outlet shrouds. The connecting member consists of a column, a first sliding groove, and a second sliding groove. There are several columns that are bolted to the surface of the frame. The cylindrical part of the column is slidably connected to the inside of the second sliding groove, and the protrusions on both sides of the column are slidably connected to the inner wall of the first sliding groove.

[0011] Preferably, the inner wall of the air inlet / outlet hood is also fitted with a dustproof net.

[0012] Preferably, a vertical rod is bolted to the top of the movable seat, and a movable sleeve is bolted to the surface of the frame, with the movable sleeve slidably connected to the inner wall of the vertical rod, for keeping the frame vertically moving above the movable seat. A sliding sleeve is bolted to the bottom of the movable seat, and a movable column slidably connected to the inner wall of the cover is bolted to the inner wall of the cover, for keeping the movable seat horizontally moving inside the cover.

[0013] Preferably, the uniform air delivery unit includes: Several flexible hoses are connected to the air outlet pipe; Several air guide covers are connected to each other via flexible hoses; The cover body is longer and wider than the air guide cover, and the cover body and the air guide cover are interconnected; Connecting pipes are used to connect the drying unit to the cover; A universal grille is installed inside the connecting pipe and near one end of the cover, with the outlets on the surface of the universal grille facing different directions.

[0014] Preferably, the universal grille is composed of vertical and horizontal bars that are interlaced. The horizontal bars on the middle side are horizontally designed, and the horizontal bars distributed to both sides have different inclination angles. The vertical bars on the middle side are perpendicular to the outlet of the connecting pipe, and the horizontal bars distributed to both sides have different orientations.

[0015] Preferably, the ends of the vertical and horizontal strips away from the cover are designed to be pointed.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes an adjustable air outlet unit consisting of a perforated plate, air outlet pipes, T-shaped columns, and connecting components. The connecting components, with their universal joint-like structure, allow each air outlet pipe to swing independently. The adjustment unit drives the frame to move up and down via a first electro-hydraulic rod and the moving seat to move horizontally via a second electro-hydraulic rod. Through the sliding cooperation between the connecting components and the T-shaped columns, the pitch and horizontal orientation of all air outlet pipe outlets are precisely controlled. This design transforms the densely arranged porous airflow from fixed to dynamically adjustable, allowing the airflow coverage angle and path to be adjusted according to the height, shape, and placement of the workpiece being baked, effectively penetrating the gaps between the workpieces.

[0017] 2. The function of the uniform air supply unit in this invention is to provide a stable and uniform air source for the aforementioned adjustable air outlets, ensuring that the air volume and pressure obtained by each adjustable air outlet are basically consistent. This unit introduces hot air from the drying unit through connecting pipes, and distributes it through a specially designed universal grille inside. The sharp grille, composed of horizontal bars with different inclination angles and vertical bars with different orientations, can cut, comb, and guide the concentrated high-speed airflow to the air guide hoods in different areas of the hood, and then deliver it to the corresponding air outlet pipes through hoses. This structure optimizes the uniformity of airflow distribution from the source, avoiding the problems of local overblowing or weak airflow caused by uneven air volume distribution. Its cooperation with the adjustable air outlet unit constitutes a complete air path system with uniform distribution and precise orientation. The two work together to achieve more refined and proactive control of the airflow organization in the chamber, greatly improving the consistency and efficiency of the baking process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure in this invention; Figure 2 This is a schematic diagram of the air outlet mechanism in this invention; Figure 3 This is a schematic diagram of the structure after the cover is removed in this invention; Figure 4 This is a schematic cross-sectional view of the connecting pipe and the first cover in this invention; Figure 5 This is a cross-sectional view of the universal grille in this invention; Figure 6 This is a schematic diagram of the structure on the back of the perforated plate in this invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A; Figure 8 This is a schematic diagram of the perforated plate in this invention; Figure 9 This is a schematic diagram of the air outlet duct and its surface in this invention; Figure 10 This is a schematic diagram of the structure of the rubber sleeve in this invention; Figure 11 This is a schematic diagram of the hemispherical groove and connecting rod in this invention; Figure 12 This is a schematic diagram of the structure of the adjustment unit in this invention; Figure 13 This is a cross-sectional view of the second heat insulation shell in this invention; Figure 14 This is a cross-sectional view of the first heat insulation shell in this invention; Figure 15 This is a schematic diagram of the connector structure in this invention; Figure 16 This is a schematic diagram of the heat dissipation component in this invention; Figure 17 This is a cross-sectional view of the air inlet and outlet shroud in this invention.

[0019] In the diagram: 1000, cabinet; 2000, drying unit; 3000, cabinet door; 4000, air outlet mechanism; 4100, adjustable air outlet unit; 4110, perforated plate; 4120, air outlet duct; 4130, T-shaped column; 4140, connecting assembly; 4141, connecting rod; 4142, hemispherical groove; 4143, sphere; 4150, rubber sleeve; 4200, cover; 4300, uniform air delivery unit; 4310, connecting pipe; 4320, cover; 4330, universal grille; 4331, vertical bar; 4332, horizontal bar; 4340, flexible hose; 435 0. Air guide shroud; 4400. Adjustment unit; 4410. Frame; 4411. Movable sleeve; 4420. Connector; 4421. Column; 4422. First slide groove; 4423. Second slide groove; 4430. Movable seat; 4431. Vertical rod; 4432. Slide sleeve; 4433. Movable column; 4440. First heat insulation shell; 4450. First electro-hydraulic rod; 4460. Second heat insulation shell; 4470. Second electro-hydraulic rod; 4480. Heat dissipation assembly; 4481. Connecting pipe; 4482. Air inlet and outlet shroud; 4483. Fan; 4484. Dustproof net. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-17 As shown, a circulating baking device includes a housing 1000, a drying unit 2000, and a door 3000 hinged to the housing 1000. The device also includes an air outlet mechanism 4000, which consists of several units and is disposed on the side wall inside the housing 1000. The air outlet mechanism 4000 is composed of an adjustable air outlet unit 4100, a cover 4200, a uniform air delivery unit 4300, and an adjustment unit 4400.

[0022] Specifically, the adjustable air outlet unit 4100 includes an orifice plate 4110, an air outlet duct 4120, a T-shaped post 4130, a connecting assembly 4140, and a rubber sleeve 4150. The orifice plate 4110 is plate-shaped and has multiple holes on its surface. The cover 4200 is bolted to the orifice plate 4110. There are several air outlet ducts 4120, and their outlet ends pass through the holes on the surface of the orifice plate 4110. The T-shaped post 4130 is composed of a cylinder with protrusions on both sides. The T-shaped post 4130 is welded to the surface of the air outlet duct 4120. The connecting assembly 4140 is used to provide the air outlet duct 4120 with the condition of turning. The rubber sleeve 4150 is fixed in the holes on the surface of the orifice plate 4110, and the air outlet duct 4120 passes through the rubber sleeve 4150. In this way, the rubber sleeve 4150 can fill the gap between the air outlet duct 4120 and the holes on the surface of the orifice plate 4110.

[0023] Furthermore, the connecting assembly 4140 consists of a connecting rod 4141, a hemispherical groove 4142, and a ball 4143. One end of the connecting rod 4141 is bolted to the orifice plate 4110, and the other end of the connecting rod 4141 is welded to the hemispherical groove 4142. The ball 4143 is fixed to the surface of the air outlet duct 4120 and is movably connected to the inner wall of the hemispherical groove 4142, forming a structure similar to a universal joint, allowing the air outlet duct 4120 to be adjusted up, down, left, and right.

[0024] Specifically, the adjustment unit 4400 includes a frame 4410, a connector 4420, a movable base 4430, a first heat insulation shell 4440, a first electro-hydraulic rod 4450, a second electro-hydraulic rod 4470, and a heat dissipation assembly 4480. The frame 4410 is disposed inside the cover 4200. The connector 4420 is in contact with the surface of the T-shaped column 4130. The movable base 4430 is disposed below the frame 4410. The first heat insulation shell 4440 is bolted to the top of the movable base 4430. The first electro-hydraulic rod 4450 is fixed inside the first heat insulation shell 4440, and its... The output shaft extends to the outside of the first heat insulation shell 4440 and is bolted to the frame 4410 to control the up and down position of the frame 4410. The output shaft of the second electro-hydraulic rod 4470 is bolted to the movable seat 4430 to control the horizontal position of the movable seat 4430. The second heat insulation shell 4460 is disposed outside the second electro-hydraulic rod 4470 and is bolted to the inner wall of the cover 4200. The heat dissipation assembly 4480 is used to generate flowing air to dissipate heat from the two sets of electro-hydraulic rods inside the first heat insulation shell 4440 and the second heat insulation shell 4460.

[0025] Since the first electro-hydraulic rod 4450 and the second electro-hydraulic rod 4470 operate in areas close to heat sources, a first heat insulation shell 4440 and a second heat insulation shell 4460 are provided. Both are made of heat-insulating composite material to reduce the impact of heat on the first electro-hydraulic rod 4450 and the second electro-hydraulic rod 4470. However, the first heat insulation shell 4440 and the second heat insulation shell 4460 prevent the heat from the first electro-hydraulic rod 4450 and the second electro-hydraulic rod 4470 from dissipating. Therefore, a heat dissipation assembly was designed. Component 4480, further, the heat dissipation assembly 4480 consists of connecting pipes 4481, inlet / outlet shrouds 4482, and a fan 4483. There are two sets of inlet / outlet shrouds 4482. The connecting pipes 4481 are composed of multiple sections of pipe connecting the first heat insulation shell 4440, the second heat insulation shell 4460, and the inlet / outlet shrouds 4482. The connecting pipes 4481 are made of insulated material to prevent external heat from affecting the internal airflow. The fan 4483 is bolted to the inlet / outlet shrouds 4481. Inside 2, the inlet / outlet hood 4482 is located on the outer wall of the housing 1000. The connector 4420 consists of a column 4421, a first slide groove 4422, and a second slide groove 4423. Several columns 4421 are bolted to the surface of the frame 4410. The cylindrical portion of the column 4421 is slidably connected to the interior of the second slide groove 4423, and the protrusions on both sides of the column 4421 are slidably connected to the inner wall of the first slide groove 4422. A dustproof net 4484 is also bolted to the inner wall of the inlet / outlet hood 4482. When the fan 4483 is turned on, one fan 4483 takes in air and the other takes out air. The outside air passes through the air inlet and outlet shrouds 4482 of one of the fans and, under the action of the connecting pipe 4481, passes through the first heat insulation shell 4440 and the second heat insulation shell 4460 in sequence, which removes the heat generated by the first electric hydraulic rod 4450 and the second electric hydraulic rod 4470, thus achieving heat dissipation. In addition, the connecting pipe 4481 can also connect the external power supply line to the two electric hydraulic rods. The dustproof net 4484 can prevent dust from entering.

[0026] A vertical rod 4431 is also bolted to the top of the movable seat 4430, and a movable sleeve 4411 is also bolted to the surface of the frame 4410. The movable sleeve 4411 is slidably connected to the inner wall of the vertical rod 4431. When the frame 4410 moves in the vertical direction, it can drive the movable sleeve 4411 to slide along the surface of the vertical rod 4431, so as to keep the frame 4410 vertically above the movable seat 4430. A sliding sleeve 4432 is also bolted to the bottom of the movable seat 4430, and a movable column 4433 that is slidably connected to the inner wall of the cover 4200 is bolted to the inner wall of the cover 4200. The movable seat 4430 can drive the sliding sleeve 4432 to slide along the surface of the movable column 4433, so as to keep the movable seat 4430 horizontally inside the cover 4200.

[0027] Specifically, the uniform air supply unit 4300 includes a flexible hose 4340, an air guide hood 4350, a cover 4320, a connecting pipe 4310, and a universal grille 4330. There are several flexible hoses 4340 and they are interconnected with the air outlet pipe 4120. There are several air guide hoods 4350 and they are interconnected with the flexible hoses 4340. The length and width of the cover 4320 are greater than the length and width of the air guide hood 4350. The cover 4320 and the air guide hood 4350 are interconnected. The connecting pipe 4310 is used to connect the dryer unit 2000 and the cover 4320. The universal grille 4330 is located inside the connecting pipe 4310 and close to one end of the cover 4320. The outlets of the universal grille 4330 face different directions.

[0028] Furthermore, the universal grille 4330 is composed of interlaced vertical bars 4331 and horizontal bars 4332. The horizontal bars 4332 on the middle side are horizontally designed, and the horizontal bars 4332 distributed to both sides have different inclination angles. The vertical bars 4331 on the middle side are perpendicular to the outlet of the connecting pipe 4310, and the horizontal bars 4332 distributed to both sides have different orientations. The ends of the vertical bars 4331 and horizontal bars 4332 that are away from the cover 4320 are designed with a sharp point.

[0029] Working principle: During operation, the hot air generated by the dryer unit 2000 enters the interior of the hood 4320 through the connecting pipe 4310. The sharp edges of the universal grille 4330, composed of vertical bars 4331 and horizontal bars 4332, cut through the flowing hot air. Guided by the universal grille 4330, the hot air is directed towards different air guide hoods 4350, and then exits through the hose 4340 and the exhaust pipe 4120. Each air guide hood 4350 corresponds to one exhaust pipe 4120. This allows for more even distribution of hot air to each air outlet 4120. The air outlet 4120 is arranged like multiple holes to ensure the uniformity of each air outlet. If the direction of the air outlet 4120 needs to be adjusted, simply activate the first electric hydraulic rod 4450. Its output shaft extends and drives the frame 4410 to descend, causing the multiple connecting parts 4420 on the surface, i.e., the columns 4421, to descend. The columns 4421 push the two protrusions of the T-shaped column 4130 through the first sliding groove 4422, thus lowering the T-shaped column 4130. When column 4130 descends, the portion of air outlet 4120 near hose 4340 lowers, while the outlet of air outlet 4120 rises. Conversely, opening the first electro-hydraulic rod 4450 raises frame 4410, lowering the outlet of air outlet 4120. Opening the second electro-hydraulic rod 4470 extends or retracts its output shaft, which moves movable seat 4430 horizontally, thereby moving the upper frame 4410 horizontally. Column 4421 moves via the second slide... The slot 4423 pushes the T-shaped column 4130 to move, changing the horizontal direction of the air outlet 4120 and achieving multi-angle adjustment. This component ensures that the air outlet 4120 is arranged in a multi-hole pattern. The multi-hole structure can effectively dampen and sort the airflow, suppress the generation of large-scale eddies, and adjust the orientation of the air outlet 4120 to adjust the direction of the multi-holes to adapt to different processing requirements. At the same time, the air ejected from each hole is more evenly distributed under the action of the universal grille 4330 and the air guide shroud 4350.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circulating baking device, comprising a housing (1000), a drying unit (2000), and a door (3000) hinged to the housing (1000), characterized in that, Also includes: The number of air outlet mechanisms (4000) is several and they are set on the side wall inside the housing (1000). The air outlet mechanism (4000) is composed of an adjustable air outlet unit (4100), a cover (4200), a uniform air delivery unit (4300) and an adjustment unit (4400).

2. The circulating baking device according to claim 1, characterized in that, The adjustable air outlet unit (4100) includes: The perforated plate (4110) is plate-shaped and has multiple holes on its surface. The cover (4200) is bolted to the perforated plate (4110). There are several air outlet pipes (4120), and their outlet ends pass through the holes on the surface of the perforated plate (4110); The T-shaped column (4130) is composed of a cylinder with protrusions on both sides, and the T-shaped column (4130) is welded to the surface of the air outlet pipe (4120); A connecting assembly (4140) is used to provide conditions for deflection to the air outlet duct (4120); A rubber sleeve (4150) is fixed in the hole on the surface of the perforated plate (4110), and the air outlet pipe (4120) passes through the rubber sleeve (4150).

3. The circulating baking device according to claim 2, characterized in that, The connecting assembly (4140) consists of a connecting rod (4141), a hemispherical groove (4142), and a sphere (4143). One end of the connecting rod (4141) is bolted to the orifice plate (4110), and the other end of the connecting rod (4141) is welded to the hemispherical groove (4142). The sphere (4143) is fixed to the surface of the air outlet pipe (4120) and is movably connected to the inner wall of the hemispherical groove (4142).

4. The circulating baking device according to claim 2, characterized in that, The adjustment unit (4400) includes: The frame (4410) is disposed inside the housing (4200); The connector (4420) is in contact with the surface of the T-post (4130); A movable seat (4430) is disposed below the frame (4410); The first heat insulation shell (4440) is bolted to the top of the movable seat (4430); The first electric hydraulic rod (4450) is fixed inside the first heat insulation shell (4440), and its output shaft extends to the outside of the first heat insulation shell (4440) and is bolted to the frame (4410) to control the up and down position of the frame (4410). The second electric hydraulic rod (4470) has its output shaft bolted to the movable seat (4430) and is used to control the horizontal position of the movable seat (4430); The second heat insulation shell (4460) is disposed on the outside of the second electric hydraulic rod (4470), and the second heat insulation shell (4460) is bolted to the inner wall of the cover (4200); The heat dissipation assembly (4480) is used to generate airflow to dissipate heat from the two sets of electro-hydraulic rods inside the first heat insulation shell (4440) and the second heat insulation shell (4460).

5. A circulating baking apparatus according to claim 4, characterized in that, The heat dissipation assembly (4480) consists of connecting pipes (4481), air inlet and outlet shrouds (4482), and a fan (4483). There are two sets of air inlet and outlet shrouds (4482). The connecting pipes (4481) are composed of multiple pipe sections that connect the first heat insulation shell (4440), the second heat insulation shell (4460), and the air inlet and outlet shrouds (4482) to each other. The fan (4483) is bolted to the air inlet and outlet shrouds (4482). Inside the frame (4410), the connector (4420) consists of a column (4421), a first groove (4422), and a second groove (4423). There are several columns (4421) and they are bolted to the surface of the frame (4410). The cylindrical part of the column (4421) is slidably connected to the inside of the second groove (4423), and the protrusions on both sides of the column (4421) are slidably connected to the inner wall of the first groove (4422).

6. The circulating baking apparatus according to claim 5, characterized in that, The inner wall of the air inlet / outlet hood (4482) is also fitted with a dustproof net (4484).

7. A circulating baking apparatus according to claim 4, characterized in that, A vertical rod (4431) is also bolted to the top of the movable seat (4430), and a movable sleeve (4411) is also bolted to the surface of the frame (4410). The movable sleeve (4411) is slidably connected to the inner wall of the vertical rod (4431) to keep the frame (4410) moving vertically above the movable seat (4430). A sliding sleeve (4432) is also bolted to the bottom of the movable seat (4430), and a movable column (4433) that is slidably connected to the inner wall of the cover (4200) is bolted to the inner wall of the cover (4200) to keep the movable seat (4430) moving horizontally inside the cover (4200).

8. A circulating baking apparatus according to claim 2, characterized in that, The uniform air delivery unit (4300) includes: The hoses (4340) are in several quantities and are interconnected with the air outlet pipe (4120); A number of air guide shrouds (4350) are connected to each other with hoses (4340); The cover (4320) is longer and wider than the air guide cover (4350), and the cover (4320) and the air guide cover (4350) are interconnected; Connecting pipe (4310) is used to connect the drying unit (2000) and the cover (4320) to each other; The universal grille (4330) is located inside the connecting pipe (4310) and near one end of the cover (4320), and the outlets on the surface of the universal grille (4330) face different directions.

9. A circulating baking apparatus according to claim 8, characterized in that, The universal grille (4330) is composed of vertical bars (4331) and horizontal bars (4332) that are interlaced. The horizontal bars (4332) on the middle side are horizontally designed, and the horizontal bars (4332) distributed on both sides have different inclination angles. The vertical bars (4331) on the middle side are perpendicular to the outlet of the connecting pipe (4310), and the horizontal bars (4332) distributed on both sides have different orientations.

10. A circulating baking apparatus according to claim 9, characterized in that, The vertical strip (4331) and the horizontal strip (4332) are designed with a sharp point at the end away from the cover (4320).

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