A hot air circulation oven with dynamic and uniform temperature

Abstract

The invention discloses a hot air circulation oven with uniform temperature, which comprises a box body with an openable and closable door, a material cabin being arranged in the box body, a heating cabin being arranged below the material cabin, and the heating cabin being connected with the material cabin through a fan cabin; a rotating frame in a circular ring structure and a driving device for driving the rotating frame to rotate around its own axis are arranged in the material cabin; a plurality of cantilevers are arranged on one side of the rotating frame, each cantilever is provided with a plurality of loading platforms for carrying materials along its own length direction, and each loading platform is connected with the cantilever through a rotating transmission mechanism; the rotating transmission mechanism enables the loading platform to rotate around its own axis and revolve around the axis of the rotating frame in a vertical plane, and the loading platform will not turn upside down, so as to meet the process requirements of chip packaging, and can also be used in some processing fields of food and medicine with restrictions on upside down turning, so as to solve the problem of inevitable temperature curve difference caused by the difference in material placement position in the existing hot air circulation oven.

Description

Technical Field

[0001] The invention relates to the technical field of heating equipment, in particular to a hot air circulation oven with dynamically uniform temperature. Background Art

[0002] Hot air oven is a commonly used heating equipment, and its principle is to use hot air for heat treatment. Existing hot air circulation ovens have disadvantages such as uneven flow field, uneven temperature field, and large differences in temperature curves of processed materials. In the fields of chips, pharmaceuticals, biology, and chemicals, materials with high requirements for temperature uniformity during the heat treatment process are involved, and the difference in the temperature curve of the heat treatment process often reduces the yield rate. Summary of the invention

[0003] In view of the above problems in the prior art, the present invention aims to provide a hot air circulation oven capable of achieving dynamic uniform temperature, thereby solving the problem of inevitable temperature curve differences caused by differences in material placement in the existing hot air circulation oven.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0005] A hot air circulation oven with dynamic and uniform temperature is provided, which comprises a box body with an openable and closable door, a material cabin is arranged in the box body, a heating cabin is arranged below the material cabin, and the heating cabin is connected with the material cabin through a fan cabin;

[0006] A rotating frame with a circular ring structure and a driving device for driving the rotating frame to rotate around its own axis are arranged in the material cabin; a plurality of cantilevers are arranged on one side of the rotating frame, each cantilever is provided with a plurality of loading platforms for carrying materials along its own length direction, and each loading platform is connected to the cantilever through a rotating transmission mechanism; the rotating transmission mechanism enables the loading platform to rotate around its own axis and revolve around the axis of the rotating frame in a vertical plane.

[0007] The basic principle of the hot air circulation oven with dynamic uniform temperature in the present invention is: the airflow heated in the heating cabin is sent into the material cabin through the fan cabin to bake the material in the stage on the cantilever. During the baking process, the rotating transmission mechanism makes the stage rotate around its own axis and revolve around the axis of the rotating frame in the vertical plane, and the stage always remains unchanged during the movement, so that the material circulates inside the material cabin, so that the material continuously changes position between the upstream and downstream of the hot air. Since the material has a certain thermal inertia, generally speaking, the faster the circulation speed, the smaller the temperature fluctuation of the material, and the speed can be adjusted according to the needs. On the other hand, while the above movement is in progress, the material continuously changes the windward surface through horizontal rotation, thereby further improving the temperature uniformity of the material and solving the problem of the inevitable temperature curve difference caused by the difference in the material placement position in the existing hot air circulation oven.

[0008] Furthermore, as a specific setting method of the rotation transmission mechanism, the rotation transmission mechanism includes a first bevel gear fixedly connected to the circumferential outer wall of the cantilever, a second bearing rotatably connected to the circumferential outer wall of the cantilever is arranged on one side of the first bevel gear, a second bevel gear meshing with the first bevel gear is arranged below the second bearing, a third bearing is arranged at the inner ring of the second bevel gear, a suspension shaft is arranged in the third bearing, the top end of the suspension shaft is fixedly connected to the circumferential outer wall of the second bearing, and the bottom end is rotatably connected to the third bearing; the worktable is fixedly connected to the lower end face of the second bevel gear.

[0009] The first bevel gear and the second bevel gear form an orthogonal transmission. The rotation period of the first bevel gear is the rotation period of the rotating frame. When the rotating frame rotates, the loading platform is always kept under the corresponding cantilever through the second bearing due to the action of gravity, and rotates horizontally around the suspension axis, that is, the total movement of the loading platform is a combination of vertical revolution and horizontal rotation; the vertical revolution of the loading platform allows the materials in the loading platform to traverse the same flow field conditions and obtain dynamically uniform temperature; the horizontal rotation of the loading platform dynamically and continuously adjusts the windward side of the materials in the loading platform, further improving the temperature uniformity of the materials in the loading platform.

[0010] Furthermore, a plurality of limiting wheels are arranged in an annular direction at the outer edge of the circumference of the rotating frame, each limiting wheel is matched with a limiting shaft, one end of each limiting shaft is fixedly connected to the box body, and the other end is rotatably sleeved with a limiting wheel. The arrangement of the plurality of limiting wheels makes the rotating frame rotate more stably under the drive of the driving device.

[0011] Furthermore, as a specific method for making the rotating frame rotate around its own axis, a rotating frame arm is provided inside the rotating frame, a fixed shaft is provided at the center of the back of the rotating frame arm, one end of the fixed shaft is fixedly connected to the back of the box body, and the other end is sleeved with a first bearing and rotatably connected to the center of the rotating frame arm;

[0012] A first gear having an end surface fixedly connected to the back of the rotating frame arm is rotatably arranged on the fixed shaft;

[0013] The driving device comprises a driving motor arranged on the back of the box body and a reducer connected to the output shaft of the driving motor. A second gear for meshing with the first gear is arranged on the power shaft of the reducer.

[0014] Furthermore, electric heating pipes are arranged in the heating chamber.

[0015] Furthermore, a centrifugal fan is arranged in the fan compartment, and the centrifugal fan is driven by a fan motor arranged outside the box body.

[0016] Furthermore, a pressure equalizing chamber with a wedge-shaped structure is arranged between the fan compartment and the material compartment, the bottom of the pressure equalizing chamber is communicated with the fan compartment, and the vertical side wall of the pressure equalizing chamber is communicated with the side wall of the material compartment.

[0017] Furthermore, the space between the material cabin and the inner wall of the box is a rear air chamber, the bottom of the rear air chamber is connected to the heating cabin, and the rear air chamber is provided with an openable and closable fresh air inlet and a protective air inlet; the material cabin is provided with an openable and closable waste outlet, multiple temperature sensors and photoelectric sensors.

[0018] Furthermore, the bulkhead connecting the fan cabin and the heating cabin is a fan cabin air inlet plate, on which a plurality of fan cabin air inlets connected to the heating cabin are arranged; the bulkhead connecting the fan cabin and the bottom of the equalizing pressure chamber is a fan cabin air outlet plate, on which a plurality of fan cabin air outlets connected to the equalizing pressure chamber are arranged.

[0019] Furthermore, the bulkhead connecting the material cabin and the vertical side wall of the equalizing chamber is a material cabin air inlet plate, on which a plurality of material cabin air inlets are arranged; the bulkhead connecting the material cabin and the rear air chamber is a material cabin air outlet plate, on which a plurality of material cabin air outlets are arranged.

[0020] The beneficial effects of the present invention are as follows: 1. In the hot air circulation oven with uniform temperature in this scheme, all the loading platforms in the material compartment rotate around their own axes and revolve around the axis of the rotating frame in the vertical plane under the action of the rotating transmission mechanism, and the loading platforms always remain unchanged during the movement, so that the materials circulate inside the material compartment, thereby continuously changing the position of the materials between the upstream and downstream of the hot air. Since the materials have a certain thermal inertia, generally speaking, the faster the circulation speed, the smaller the temperature fluctuation of the materials, and the speed can be adjusted according to the needs. On the other hand, while the above movement is in progress, the windward surface of the materials is continuously changed through horizontal rotation, thereby further improving the temperature uniformity of the materials and solving the problem of the inevitable temperature curve difference caused by the difference in the material placement position in the existing hot air circulation oven.

[0021] 2. In the hot air circulation oven with dynamically uniform temperature in this scheme, the stage will not flip upside down during the rotation around its own axis and the revolution around the axis of the rotating frame in the vertical plane, which can meet the process requirements of chip packaging and can also be used in some food and medicine processing fields where there are restrictions on upside down flipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall front view structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the side structure of the material cabin of the present invention.

[0024] Figure 3 It is a schematic diagram of the air inlet plate of the material cabin of the present invention.

[0025] Figure 4 It is a schematic diagram of the air outlet plate of the material cabin of the present invention.

[0026] Figure 5 It is a schematic diagram of the air inlet plate of the fan compartment of the present invention.

[0027] Figure 6 It is a schematic diagram of the fan compartment air outlet plate of the present invention.

[0028] Among them, 1. Box; 2. Fan cabin; 3. Pressure equalizing chamber; 4. Material cabin; 5. Rear air chamber; 6. Heating cabin; 7. Rotary frame; 8. Loading platform; 9. First bearing; 10. Fixed shaft; 11. Rotary frame arm; 12. First gear; 13. Second gear; 14. Power shaft; 15. Speed ​​reducer; 16. Driving motor; 17. Limiting wheel; 18. Limiting shaft; 19. Cantilever; 20. First bevel gear; 21. Second bearing; 22. Suspension shaft; 23. The third bearing; 24. The second bevel gear; 25. The material compartment air outlet plate; 26. The material compartment air outlet; 27. The electric heating pipe; 28. The fan compartment air inlet plate; 29. ​​The fan compartment air inlet; 30. The centrifugal fan; 31. The fan compartment air outlet plate; 32. The fan compartment air outlet; 33. The fan motor; 34. The material compartment air inlet plate; 35. The material compartment air inlet; 36. The compartment door; 37. The photoelectric sensor; 38. The fresh air outlet; 39. The protective gas inlet; 40. The waste outlet. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0030] like Figure 1 As shown, the present invention provides a hot air circulation oven with dynamically uniform temperature, which includes a box body 1 with an openable and closable door 36, and an insulation layer is arranged on the outside of the box body 1 to inhibit heat exchange between the inside of the box body 1 and the outside. The insulation layer material of this embodiment is rock wool.

[0031] A material cabin 4 is arranged in the box body 1, a heating cabin 6 is arranged below the material cabin 4, and an electric heating pipe 27 for heating the airflow is arranged in the heating cabin 6. A rear air chamber 5 is arranged on the left side of the material cabin 4, and a pressure equalizing chamber 3 with a wedge-shaped structure is arranged on the right side. The left side of the heating cabin 6 is connected to the bottom of the rear air chamber 5, and a fan cabin 2 is arranged on the right side of the heating cabin 6. A centrifugal fan 30 for pumping airflow is arranged in the fan cabin 2, and the centrifugal fan 30 is driven by a fan motor 33 arranged outside the box body 1.

[0032] The top of the fan cabin 2 is connected to the pressure equalizing chamber 3. The airflow heated in the heating cabin 6 is sent into the material cabin 4 through the fan cabin 2. The airflow circulation flow path of the hot air circulation oven is: fan cabin 2, pressure equalizing chamber 3, material cabin 4, rear air chamber 5, heating cabin 6.

[0033] A rotating frame 7 with a circular ring structure and a driving device for driving the rotating frame 7 to rotate around its own axis are arranged in the material cabin 4; a plurality of cantilevers 19 are arranged on one side of the rotating frame 7, and specifically, the plurality of cantilevers 19 are evenly arranged at intervals in the circumferential direction, and the axis of each cantilever 19 is parallel to the axis of the rotating frame 7, and each cantilever 19 is provided with a plurality of loading platforms 8 for carrying materials along its own length direction.

[0034] Preferably, the loading platform 8 is a grid frame, the materials are loaded into a material box, and the material box is integrally loaded into the loading platform 8, in order to facilitate loading and unloading of materials.

[0035] Each loading platform 8 is connected to the cantilever 19 through a rotating transmission mechanism; the rotating transmission mechanism makes the loading platform 8 rotate around its own axis and revolve around the axis of the rotating frame 7 in a vertical plane, and the loading platform 8 always remains unchanged during the movement, so that the material circulates inside the material compartment 4, so that the material continuously changes its position between the upstream and downstream of the hot air. Since the material has a certain thermal inertia, generally speaking, the faster the circulation speed, the smaller the temperature fluctuation of the material, and the speed can be adjusted according to needs. On the other hand, while the above movement is in progress, the material continuously changes its windward surface through horizontal rotation, thereby further improving the temperature uniformity of the material and solving the problem of the inevitable temperature curve difference caused by the difference in the material placement position in the existing hot air circulation oven.

[0036] like Figures 1-2 As shown, in Figure 2 In order to make the drawings clearer, only two cantilevers 9 and four limit wheels 17 are depicted. As a specific setting mode of the rotary transmission mechanism, the rotary transmission mechanism includes a first bevel gear 20 fixedly connected to the circumferential outer wall of the cantilever 19, a second bearing 21 rotatably connected to the circumferential outer wall of the cantilever 19 is arranged on one side of the first bevel gear 20, a second bevel gear 24 meshing with the first bevel gear 20 is arranged below the second bearing 21, a third bearing 23 is arranged at the inner ring of the second bevel gear 24, a suspension shaft 22 is arranged in the third bearing 23, the top end of the suspension shaft 22 is fixedly connected to the circumferential outer wall of the second bearing 21, and the bottom end is rotatably connected to the third bearing 23; the loading platform 8 is fixedly connected to the lower end face of the second bevel gear 24.

[0037] The first bevel gear 20 and the second bevel gear 24 form an orthogonal transmission. The rotation period of the first bevel gear 20 is the rotation period of the rotating frame 7. When the rotating frame 7 rotates, the stage 8 is always kept under the corresponding cantilever 19 by the second bearing 21 due to the action of gravity, and rotates horizontally around the suspension shaft 22, that is, the total movement of the stage 8 is a combination of vertical revolution and horizontal rotation; the vertical revolution of the stage 8 allows the materials in the stage 8 to traverse the same flow field conditions and obtain a dynamically uniform temperature; the horizontal rotation of the stage 8 dynamically and continuously adjusts the windward surface of the materials in the stage 8, further improving the temperature uniformity of the materials in the stage 8; the stage 8 will not flip up and down during the rotation around its own axis and the revolution around the axis of the rotating frame 7 in the vertical plane, which can meet the process requirements of chip packaging, and can also be used in some food and medicine processing fields that have restrictions on up and down flipping.

[0038] As a specific adjustment method for the horizontal rotation speed of the worktable 8, when the transmission ratio of the first bevel gear 20 and the second bevel gear 24 is 2, the rotation period of the worktable 8 is twice the revolution period, so that the windward side of the worktable 8 can be alternately changed by 180° at the same position; when the transmission ratio of the first bevel gear 20 and the second bevel gear 24 is 4, the rotation period of the worktable 8 is four times the revolution period, so that the windward side of the worktable 8 can be alternately changed by 90° at the same position.

[0039] like Figures 1-2 As shown, preferably but not limitedly, as a specific way to make the rotating frame 7 rotate around its own axis, a rotating frame arm 11 is provided inside the rotating frame 7. In this embodiment, the rotating frame arm 11 is a three-pronged structure, and the three ends of the rotating frame arm 11 are fixedly connected to the inner wall of the rotating frame 7. At the same time, a fixed shaft 10 is provided at the center of the back of the rotating frame arm 11, one end of the fixed shaft 10 is fixedly connected to the back of the box body 1, and the other end is sleeved with a first bearing 9 and rotatably connected to the center of the rotating frame arm 11; a first gear 12 with an end face fixedly connected to the back of the rotating frame arm 11 is rotatably provided on the fixed shaft 10; the driving device includes a driving motor 16 arranged on the back of the box body 1 and a reducer 15 connected to the output shaft of the driving motor 16, and a second gear 13 for meshing with the first gear 12 is provided on the power shaft 14 of the reducer 15.

[0040] When the rotating frame 7 needs to be rotated, the driving motor 16 is started, and the output end of the driving motor 16 distributes power to the power shaft 14 of the reducer 15. The power shaft 14 drives the first gear 12 to rotate through the second gear 13. The rotation of the first gear 12 drives the rotating frame arm 11 to rotate, and the rotating frame arm 11 drives the rotating frame 7 to rotate, thereby realizing the rotation of the worktable 8 on the multiple cantilevers 19 on the rotating frame 7 in the vertical plane (i.e., the rotation around the axis of the rotating frame 7 in the vertical plane).

[0041] At the same time, a plurality of limiting wheels 17 are circumferentially arranged at the outer edge of the circumference of the rotating frame 7, and each limiting wheel 17 is matched with a limiting shaft 18. One end of each limiting shaft 18 is fixedly connected to the box body 1, and the other end is rotatably sleeved with a limiting wheel 17. The arrangement of the plurality of limiting wheels 17 makes the rotating frame 7 more stable when driven by the driving device.

[0042] The rear air chamber 5 is provided with an openable and closable fresh air inlet 38 and a protective air inlet 39 ; the material cabin 4 is provided with an openable and closable waste outlet 40 , a plurality of temperature sensors and a photoelectric sensor 37 .

[0043] The fresh air inlet 38 is used to introduce outside air; the protective gas inlet 39 is used to introduce protective gas to meet the heat treatment process; and the waste outlet 40 is used to discharge the waste gas in the material cabin 4.

[0044] Multiple temperature sensors are used to monitor the temperature of the material compartment 4 and estimate the average temperature of the material; the light source and light receiver of the photoelectric sensor 37 are respectively located on both sides of the material compartment 4 to monitor the gas transmission light in real time. The wavelength band of the light source can be adjusted and selected according to the exhaust gas absorption spectrum. When the exhaust gas concentration reaches the threshold value specified by the process requirements, the fresh air inlet 38 or the protective gas inlet 39 and the exhaust outlet 40 are opened to operate the hot air circulation oven.

[0045] Specifically, Figure 5-6 As shown, the wall connecting the fan compartment 2 and the heating compartment 6 is a fan compartment air inlet plate 28, and the fan compartment air inlet plate 28 is provided with a plurality of fan compartment air inlets 29 connected to the heating compartment 6; the wall connecting the fan compartment 2 and the bottom of the equalizing chamber 3 is a fan compartment air outlet plate 31, and the fan compartment air outlet plate 31 is provided with a plurality of fan compartment air outlets 32 connected to the equalizing chamber 3. The airflow heated by the electric heating tube enters the fan compartment 2 through the fan compartment air inlet 29 on the fan compartment air inlet plate 28, and after being accelerated by the centrifugal fan 30, it is sent into the equalizing chamber 3 from the fan compartment air outlet 32 ​​on the fan compartment air outlet plate 31. It should be noted that the centrifugal fan 30 can be provided with multiple sets of impellers, taking 4 sets as an example, which can be driven by the fan motor 33 through a simple transmission method.

[0046] like Figure 3-4 As shown, specifically, the bulkhead connecting the material cabin 4 and the vertical side wall of the equalizing chamber 3 is a material cabin air inlet plate 34, and a plurality of material cabin air inlets 35 are arranged on the material cabin air inlet plate 34; hot air enters the equalizing chamber 3 from the fan cabin 2, and flows into the material cabin 4 from the material cabin air inlet 35 on the material cabin air inlet plate 34; the total area of ​​the fan cabin air outlet 32 ​​and the material cabin air inlet 35 are equal, so as to ensure the uniformity of the flow field in the material cabin 4.

[0047] The bulkhead connecting the material bin 4 and the rear air chamber 5 is a material bin air outlet plate 25, on which a plurality of material bin air outlets 26 are arranged. The plurality of material bin air outlets 26 are designed to be strip-shaped with larger upper portions and smaller lower portions. Optimizing the angle thereof can make the air pressure at the air outlet of the air outlet plate consistent, and the angle between the two sides of the material bin air outlet 26 is 0.34°.

Claims

1. A hot air circulation oven with dynamic uniform temperature, characterized in that: It comprises a box body with an openable and closable door, wherein a material cabin is arranged in the box body, a heating cabin is arranged below the material cabin, and the heating cabin is connected with the material cabin through a fan cabin; A rotating frame with a circular ring structure and a driving device for driving the rotating frame to rotate around its own axis are arranged in the material cabin; a plurality of cantilevers are arranged on one side of the rotating frame, each of the cantilevers is provided with a plurality of loading platforms for carrying materials along its length direction, and each of the loading platforms is connected to the cantilever through a rotating transmission mechanism; the rotating transmission mechanism enables the loading platform to rotate around its own axis and revolve around the axis of the rotating frame in a vertical plane; The rotary transmission mechanism comprises a first bevel gear fixedly connected to the circumferential outer wall of the cantilever, a second bearing rotatably connected to the circumferential outer wall of the cantilever is arranged on one side of the first bevel gear, a second bevel gear meshing with the first bevel gear is arranged below the second bearing, a third bearing is arranged at the inner ring of the second bevel gear, a suspension shaft is arranged in the third bearing, the top end of the suspension shaft is fixedly connected to the circumferential outer wall of the second bearing, and the bottom end is rotatably connected to the third bearing; the loading platform is fixedly connected to the lower end surface of the second bevel gear; The space between the material cabin and the inner wall of the box is a rear air chamber, the bottom of which is connected to the heating cabin, and the rear air chamber is provided with an openable and closable fresh air inlet and a protective air inlet; the material cabin is provided with an openable and closable waste outlet, multiple temperature sensors and photoelectric sensors.

2. The hot air circulation oven with dynamic uniform temperature according to claim 1, characterized in that: A plurality of limiting wheels are circumferentially arranged at the outer edge of the circumference of the rotating frame, each of the limiting wheels is matched with a limiting shaft, one end of each limiting shaft is fixedly connected to the box body, and the other end is rotatably sleeved with a limiting wheel.

3. The hot air circulation oven with dynamic uniform temperature according to claim 1, characterized in that: A rotating frame arm is arranged inside the rotating frame, a fixed shaft is arranged at the center of the back of the rotating frame arm, one end of the fixed shaft is fixedly connected to the back of the box body, and the other end is sleeved with a first bearing and rotatably connected to the center of the rotating frame arm; A first gear having an end surface fixedly connected to the back of the rotating frame arm is rotatably arranged on the fixed shaft; The driving device comprises a driving motor arranged on the back of the box body and a reducer connected to the output shaft of the driving motor, and a second gear for meshing with the first gear is arranged on the power shaft of the reducer.

4. The hot air circulation oven with dynamic uniform temperature according to claim 1, characterized in that: An electric heating pipe is arranged in the heating chamber.

5. The hot air circulation oven with dynamic uniform temperature according to claim 1, characterized in that: A centrifugal fan is arranged in the fan compartment, and the centrifugal fan is driven by a fan motor arranged outside the box body.

6. The hot air circulation oven with dynamic uniform temperature according to claim 1, characterized in that: A pressure equalizing chamber with a wedge-shaped structure is arranged between the fan compartment and the material compartment, the bottom of the pressure equalizing chamber is communicated with the fan compartment, and the vertical side wall of the pressure equalizing chamber is communicated with the side wall of the material compartment.

7. The hot air circulation oven with dynamic uniform temperature according to claim 6, characterized in that: The bulkhead connecting the fan cabin and the heating cabin is a fan cabin air inlet plate, on which a plurality of fan cabin air inlets connected to the heating cabin are arranged; the bulkhead connecting the fan cabin and the bottom of the equalizing chamber is a fan cabin air outlet plate, on which a plurality of fan cabin air outlets connected to the equalizing chamber are arranged.

8. The hot air circulation oven with dynamic uniform temperature according to claim 7, characterized in that: The bulkhead connecting the material bunker and the vertical side wall of the equalizing chamber is a material bunker air inlet plate, on which a plurality of material bunker air inlets are arranged; the bulkhead connecting the material bunker and the rear air chamber is a material bunker air outlet plate, on which a plurality of material bunker air outlets are arranged.

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