Air duct structure of an oven and drying air speed adjusting method

Abstract

The application discloses a kind of air duct structure and drying air speed adjusting method of oven, belong to oven technical field.Mainly include air duct, the air duct is arranged in oven main body;PLC control system, the PLC control system is installed on oven main body;Fan assembly, the fan assembly is installed in the lower end of air duct, fan assembly is connected with PLC control system signal, fan assembly is provided with suction port and exhaust port, suction port is connected with the lower end of air duct, exhaust port is connected with the downside of drying chamber;Adjusting dust cleaning component, the adjusting dust cleaning component is installed at suction port, adjusting dust cleaning component is connected with PLC control system signal, adjusting dust cleaning component includes: dust cleaning component, the dust cleaning component is installed at suction port;Adjusting component, the adjusting component is installed in dust cleaning component.The air duct structure and drying air speed adjusting method of oven of the application reach the effect of adaptive regulation drying air speed.

Description

Technical Field

[0001] This application relates to the field of oven technology, specifically to an oven air duct structure and a method for adjusting drying air speed. Background Technology

[0002] The design of the hot air circulation duct of the drying oven has a significant impact on the efficiency and service life of the drying equipment. The air circulation system of the hot air circulation oven adopts a fan circulation air supply method. The air source is driven by the circulating fan motor to drive the fan wheel through the heater and send out the hot air, which then goes through the air duct to the drying chamber. The used air is then drawn into the air duct to become the air source for recirculation, thus achieving efficient utilization of heat energy.

[0003] When using an oven to dry powder materials, the air speed of the circulating fan inside the oven needs to be adjusted appropriately. This will ensure high drying efficiency while preventing materials from being carried into the circulating air duct by hot air, which could lead to cross-contamination when drying different materials in sequence.

[0004] As the moisture content of the material decreases, the material particles or powders are more easily blown away by the hot air. Usually, the air speed of the circulating fan is automatically adjusted according to the drying time. However, this adjustment method cannot be adjusted according to the actual situation of the material in the drying chamber. During the drying process, it is easy for material particles to be carried into the circulating air duct by the hot air at a certain time, which will affect the drying of other materials afterwards. Therefore, it is necessary to provide an air duct structure for the drying oven and a drying air speed adjustment method to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present invention, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the above-mentioned problems in the existing technology, the technical problem to be solved by the present invention is to provide an air duct structure for an oven and a method for adjusting the drying air speed, so as to achieve the effect of adaptively adjusting the drying air speed.

[0007] The technical solution adopted by this application to solve its technical problem is: a duct structure for an oven and a method for adjusting drying air speed, including an air duct, which is disposed inside the oven body and is used to provide air circulation. The upper end of the air duct is connected to the upper side of the drying chamber; a PLC control system, which is installed on the oven body; and a fan assembly, which is installed at the lower end of the air duct and is signal-connected to the PLC control system. The fan assembly is used to increase the airflow speed and is provided with an air intake and an exhaust port. The lower end of the air duct is connected, and the exhaust port is connected to the lower side of the drying chamber; an adjustable dust removal component is installed at the air intake and is signal-connected to the PLC control system. The adjustable dust removal component includes: a dust removal component installed at the air intake for filtering and cleaning the air entering the air intake; and an adjustment component installed inside the dust removal component for adjusting the air intake speed of the fan component according to the cleaning status of the dust removal component.

[0008] Furthermore, the dust removal assembly includes a dividing wheel installed on one side of the air intake. A ring-shaped filter cartridge is connected to the dividing wheel by a bearing. The ring-shaped filter cartridge has multiple sets of ventilation holes in its circumferential direction. A baffle is installed in the middle of the dividing wheel. The baffle is adapted to cooperate with the ring-shaped filter cartridge to divide the dividing wheel into a ventilation chamber and a cleaning chamber. The ventilation chamber is connected to the air intake. The outer side of the ring-shaped filter cartridge at the ventilation chamber is connected to the air duct. A second drive is installed on the dividing wheel. The output end of the second drive is fixedly connected to the ring-shaped filter cartridge. The second drive is used to drive the ring-shaped filter cartridge to rotate circumferentially. A striking assembly is provided in the cleaning chamber. The striking assembly is used to strike and clean the part of the ring-shaped filter cartridge that has rotated into the cleaning chamber.

[0009] Furthermore, the striking assembly includes an elastic sleeve mounted on a separator wheel, a connecting rod slidably connected to the inner side of the elastic sleeve, a cleaning part fixedly mounted at one end of the connecting rod near the annular filter cylinder, a power rod fixedly mounted at the other end of the connecting rod, a first spring installed between the elastic sleeve and the connecting rod, the first spring being used to provide a force for the connecting rod to slide toward the annular filter cylinder, a power wheel fixedly mounted at the output end of the second drive, an inner cam groove being formed on the inner side of the power wheel, and the power rod being located within the inner cam groove;

[0010] Wherein: the connecting rod is adapted to perform a cyclical motion of slowly moving away from and then quickly moving closer to the annular filter cartridge during the second drive operation.

[0011] Furthermore, the second drive is connected to the annular filter cartridge by two sets of reduction gears, and the power wheel is mounted on the shaft of the first set of reduction gears.

[0012] Furthermore, an inlet roller and an outlet roller are rotatably connected to the inner sides of the separator wheel and the annular filter cylinder, respectively. The inlet roller and the outlet roller are located on both sides of the baffle. Both the outlet roller and the inlet roller are tangent to the outer side of the annular filter cylinder. Both the inlet roller and the outlet roller are made of sponge material.

[0013] Furthermore, a collection pipe is fixedly connected to the lower end of the separator wheel, and the collection pipe is located below the cleaning section.

[0014] Furthermore, the adjustment assembly includes a pressure sensor mounted on the baffle, and the pressure sensor is signal-connected to the PLC control system.

[0015] Furthermore, the adjustment assembly includes a sensing cylinder mounted on the baffle, a pressure plate slidably connected inside the sensing cylinder, a second spring installed between the pressure plate and the sensing cylinder, and a motor control assembly installed inside the sensing cylinder. The motor control assembly is used to control the wind speed of the fan assembly and the speed of the second drive rotation under the action of the pressure plate.

[0016] Furthermore, the motor control assembly includes a reduction gearbox vertically installed inside the induction cylinder. A reduction lever is slidably connected inside the reduction gearbox. Oil is provided inside the reduction gearbox, and the oil is above the reduction lever. A contact sensor is installed at the upper end of the reduction gearbox, and the contact sensor is signal-connected to the PLC control system. The reduction lever is adapted to be pressed into the reduction gearbox when the pneumatic plate slides upward. An adjusting block is installed inside the induction cylinder. A temporary storage chamber and a speed-up chamber are provided inside the adjusting block. A contact block is slidably connected to the inner side of the speed-up chamber. A third spring is installed between the contact block and the speed-up chamber. The contact block is adapted to be positioned at the lower end of the speed-up chamber under the elastic force of the third spring. A resistance strip is installed on one side of the speed-up chamber, and the lower end of the resistance strip contacts the contact block. A power source is electrically connected to one side of the contact block. The end of the resistance strip away from the contact block is electrically connected to the second drive. The lower ends of both the temporary storage chamber and the speed-up chamber are connected to the upper end of the reduction gearbox via pipelines.

[0017] Furthermore, the drying air speed adjustment method includes:

[0018] S1. Air entering the intake port is filtered through the vent holes on the annular filter cartridge;

[0019] S2. The second drive drives the annular filter cartridge to rotate, continuously rotating the vent hole at the venting chamber into the cleaning chamber.

[0020] S3. The ventilation holes in the cleaning chamber are cleaned by striking them with the dust removal component;

[0021] S4. Real-time monitoring of air pressure in the ventilation chamber via adjustment components;

[0022] S5. When the pressure inside the ventilation chamber gradually decreases to a certain value, control the fan assembly to reduce the wind speed.

[0023] S6. When the pressure inside the ventilation chamber suddenly decreases to a certain value, the fan assembly is controlled to reduce the wind speed and increase the speed of the second drive.

[0024] The beneficial effects of this application are: the air duct structure and drying air speed adjustment method of the oven provided by this application, through the cooperation of the dust removal component and the adjustment component, can automatically adjust the air speed in the air duct according to the actual cleaning situation while filtering and cleaning the air in the air duct, thereby improving the drying efficiency without wasting too much drying material and preventing cross-contamination.

[0025] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] In the attached diagram:

[0028] Figure 1 This is an overall schematic diagram of the air duct structure and drying air speed adjustment method of an oven according to this application;

[0029] Figure 2 for Figure 1 A side view sectional diagram;

[0030] Figure 3 for Figure 1 A frontal cross-sectional view;

[0031] Figure 4 for Figure 2 A schematic diagram of the overall adjustment and dust removal components in area A;

[0032] Figure 5 for Figure 4 A schematic diagram of a localized explosion;

[0033] Figure 6 for Figure 4A schematic cross-sectional view of the entire structure;

[0034] Figure 7 for Figure 6 Enlarged view of region B in the middle;

[0035] Figure 8 for Figure 6 Enlarged cross-sectional view of region C in the middle;

[0036] Figure 9 for Figure 6 Enlarged cross-sectional view of region D in the middle;

[0037] Figure 10 for Figure 9 Enlarged schematic diagram of region E in the middle;

[0038] The following are the labeling elements in the figure:

[0039] 1. Oven body; 2. Drying chamber; 3. Air duct; 4. Heater; 5. Fan wheel; 6. First drive; 7. Adjustable dust removal assembly; 8. Collection pipe; 9. Divider plate; 10. Electrical box; 11. Divider wheel; 12. Annular filter cartridge; 13. Second drive; 14. Inlet roller; 15. Induction cylinder; 16. Connecting rod; 17. Cleaning section; 18. Baffle; 19. First gear; 20. Second gear; 21. Drive shaft; 22. Power wheel; 23. Third gear; 24. Fourth gear; 25. Power rod; 26. Elastic sleeve; 27. First spring; 28. Air pressure plate; 29. ​​Second spring; 30. Reduction chamber; 31. Reduction rod; 32. Resistance bar; 33. Speed-up chamber; 34. Temporary storage chamber; 35. Third spring; 36. Contact block; 37. Flow limiting ball; 38. Flow limiting groove; 39. Adjusting block; 40. Outlet roller. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0042] like Figures 1-3As shown, this application provides an air duct structure for an oven and a method for adjusting the drying air speed. The oven body 1 is provided with a drying chamber 2. A tray for holding drying materials is fixedly installed in the drying chamber 2. The drying chamber 2 has a rectangular box structure. The opening of the drying chamber 2 faces forward, i.e., towards the oven door of the oven body 1. The oven door is closed to achieve sealing. The side of the drying chamber 2 opposite to the oven door is a sealing sheet metal part. The four sides of the drying chamber 2 are sheet metal parts with multiple sets of holes.

[0043] An electrical box 10 is fixedly installed on the upper end of the oven body 1. A PLC control system is fixedly installed inside the electrical box 10. The PLC control system is used to automatically control the electrical components inside the oven.

[0044] A partition plate 9 is installed on each of the upper two sides of the drying chamber 2. The partition plate 9 is used to cooperate with the main body 1 of the drying oven to separate the space on the upper side of the drying chamber 2 from the space on the sides and the lower side of the drying chamber 2. An air duct 3 for air circulation is opened vertically on the rear side of the drying chamber 2. The upper side of the air duct 3 is connected to the upper space of the drying chamber 2. A fan assembly is connected to the lower end of the air duct 3. The fan assembly includes a first drive 6. The first drive 6 is fixedly installed on the outside of the main body 1 of the drying oven. The first drive 6 is a circulating air supply motor. The first drive 6 is connected to the PLC control system. A fan wheel 5 is fixedly installed on the drive shaft of the first drive 6. A cover is fitted on the outside of the fan wheel 5. An air intake is opened on the side of the cover near the air duct 3. An exhaust port is opened at the lower end of the cover and is connected to the lower and side spaces of the drying chamber 2. The first drive 6 is powered on and rotated by the PLC control system to drive the fan wheel 5 to rotate, thereby continuously drawing air in from the air intake and discharging it from the exhaust port.

[0045] This allows the airflow to be discharged into the lower and side spaces of the drying chamber 2 through the rotation of the impeller 5 within the air duct 3. The airflow then flows into the inner side of the drying chamber 2 through the holes opened on the sheet metal parts on the lower and side sides of the drying chamber 2, and then flows into the upper space of the drying chamber 2 through the holes at the upper end of the drying chamber 2, and then flows to the upper side of the air duct 3. In this way, the airflow can complete the circulation between the drying chamber 2 and the air duct 3.

[0046] A heater 4 is installed on the upper side of the air duct 3. The heater 4 is fixedly installed on the main body 1 of the oven. The heater 4 is used to heat the airflow passing through the air duct 3, so that the heated airflow is blown into the drying chamber 2 by the impeller 5 to dry the material on the tray.

[0047] In order to enable the air velocity in drying chamber 2 to be automatically adjusted according to the actual drying conditions of the material, and to prevent excessive material particles from being blown into air duct 3 and causing cross-contamination to other materials being dried subsequently, the structure of air duct 3 has been modified, and its specific structure is as follows:

[0048] like Figures 4-6 As shown, an adjustable dust removal component 7 is installed in the air duct 3. The adjustable dust removal component 7 is located at the air intake of the impeller 5. The adjustable dust removal component 7 includes a dust removal component and an adjustment component. The dust removal component is used to filter and clean the air entering the air intake, and the adjustment component is used to adjust the air intake speed of the fan component according to the cleaning status of the dust removal component.

[0049] The dust removal assembly includes a separator wheel 11 fixedly installed on the side adjacent to the air intake and the air duct 3. The separator wheel 11 has a hollow structure inside, with one side of its upper semicircular part open. At the same time, the semicircular arc plate in the circumferential direction of the upper semicircle is removed. The inner bearing of the separator wheel 11 is connected to an annular filter cylinder 12. The annular filter cylinder 12 is a cylindrical structure with one side open. Its unopened plane fits against the unopened side of the separator wheel 11. Multiple sets of ventilation holes are opened in the circumferential direction of the annular filter cylinder 12. The annular filter cylinder 12 and the separator wheel 11 are on the same axis.

[0050] Meanwhile, a baffle 18 is fixedly installed in the middle of the separator wheel 11. The baffle 18 is located inside the annular filter cylinder 12, and both ends of the baffle 18 are provided with rounded chamfers that are tangent to the inner side of the annular filter cylinder 12. By cooperating with the annular filter cylinder 12, the separator wheel 11 can be divided into an upper ventilation chamber and a lower cleaning chamber.

[0051] The ventilation chamber is connected to the air intake port. The outer side of the annular filter 12 in the ventilation chamber is connected to the air duct 3. That is, the air in the air duct 3 can only enter the air intake port through the air hole on the annular filter 12 in the ventilation chamber.

[0052] An inlet roller 14 is rotatably connected to the inner sides of the separator wheel 11 and the annular filter cylinder 12, and an outlet roller 40 is fixedly installed. The inlet roller 14 and the outlet roller 40 are located on both sides of the baffle 18. The inlet roller 14 and the outlet roller 40 are used to fill the gap between the outer side of the annular filter cylinder 12 and the separator wheel 11 at the junction of the ventilation chamber and the cleaning chamber. The outlet roller 40 and the inlet roller 14 are both tangent to the outer side of the annular filter cylinder 12. The inlet roller 14 and the outlet roller 40 are both made of sponge material.

[0053] Thus, the cleaning chamber is completely isolated from the air duct 3 and the air intake by the cooperation of the inlet roller 14, the outlet roller 40 and the baffle 18 with the annular filter cartridge 12;

[0054] like Figures 4-7As shown, a second drive 13 is fixedly installed on the side of the separator wheel 11 near the air inlet. Two sets of reduction gears are connected between the second drive 13 and the annular filter cartridge 12. The two sets of reduction gears include a first gear 19 fixedly installed at the output end of the second drive 13. A transmission shaft 21 is connected to the internal bearing of the separator wheel 11. The transmission shaft 21 is located in the cleaning chamber. A second gear 20 is fixedly installed on the side of the transmission shaft 21 near the second drive 13. The second gear 20 meshes with the first gear 19. When the first gear 19 rotates, it will drive the second gear 20 to rotate at a reduced speed.

[0055] A third gear 23 is fixedly installed on the side of the drive shaft 21 away from the second drive 13, and a fourth gear 24 is fixedly installed concentrically on the unopened side of the annular filter cylinder 12. The third gear 23 and the fourth gear 24 mesh and drive each other. When the third gear 23 rotates, it will drive the fourth gear 24 to rotate at a reduced speed.

[0056] Two sets of reduction gears can drive the annular filter cartridge 12 to rotate slowly in a circumferential direction. The rotation direction of the annular filter cartridge 12 is from the inlet roller 14 into the cleaning chamber and from the outlet roller 40 into the ventilation chamber. The cleaning chamber is equipped with a striking component, which is used to strike and clean the part of the annular filter cartridge 12 that has rotated into the cleaning chamber.

[0057] The lower end of the separator wheel 11 is fixedly connected to the collection tube 8. The upper end of the collection tube 8 is connected to the lower side of the cleaning chamber, and the lower end of the collection tube 8 is connected to the outside of the oven body 1 for easy collection.

[0058] When the first drive 6 is powered on, the impeller 5 rotates to draw air from the air inlet. At this time, the hot air heated by the heater 4 in the air duct 3 will enter the ventilation chamber through the vent on the annular filter cylinder 12 and be drawn into the air inlet. When the hot air passes through the annular filter cylinder 12, the material powder in the hot air will be blocked by the vent. Then, the second drive 13 drives the annular filter cylinder 12 to rotate continuously, so that the vent that blocks the material powder will carry it from the inlet roller 14 into the cleaning chamber. The inlet roller 14 is tangent to the outer side of the annular filter cylinder 12 and can rotate in the opposite direction as the annular filter cylinder 12 rotates, so that it will not block the material powder entering the cleaning chamber.

[0059] When the vent carrying the material powder rotates to the position of the impact component, the impact component shakes the material powder off the surface of the annular filter cylinder 12 by impact. The material powder slides down the side wall of the cleaning chamber into the collection pipe 8 for discharge and collection. The vent through the impact component continues to rotate with the annular filter cylinder 12. When it rotates to the outlet roller 40, the outlet roller 40 cannot rotate and is tangent to the outer side wall of the annular filter cylinder 12. Therefore, some material powder adhering to the outer surface of the annular filter cylinder 12 will be blocked by the outlet roller 40 in the cleaning chamber. The vent rotating from the outlet roller 40 position to the vent in the air chamber will continue to filter and collect the hot air passing through. This cycle prevents the material powder from circulating in the air duct and eventually remaining in the oven, causing contamination to other dried materials.

[0060] like Figures 6-8 As shown, the striking assembly includes an elastic sleeve 26 mounted on the separator wheel 11. The elastic sleeve 26 is located inside the annular filter cylinder 12. A connecting rod 16 is slidably connected to the inner side of the elastic sleeve 26. A cleaning part 17 is fixedly installed at one end of the connecting rod 16 near the annular filter cylinder 12. The cleaning part 17 is a rubber block with a spherical end. An annular step is fixedly installed on the part of the connecting rod 16 inside the elastic sleeve 26. A first spring 27 is fixedly installed between the elastic sleeve 26 and the annular step. The first spring 27 is used to give the connecting rod 16 a sliding force towards the annular filter cylinder 12 through the annular step. When no external force is applied, the connecting rod 16 is subjected to the elastic force of the first spring 27, causing the cleaning part 17 to be in contact with the inner surface of the annular filter cylinder 12.

[0061] A power rod 25 is fixedly installed at the other end of the connecting rod 16, and a power wheel 22 is fixedly installed on the transmission shaft 21. An inner cam groove is opened on the inner side of the power wheel 22. The inner cam groove has a spiral structure, and its highest point and lowest point are transitioned in a cross-sectional manner. The power rod 25 is slidably connected in the inner cam groove. The power rod 25 is always in contact with the lower surface of the inner cam groove due to the elastic force of the first spring 27. When the power rod 25 is in the inner cam groove away from the axis of the power wheel 22, the cleaning part 17 is in contact with the inner surface of the annular filter cartridge 12. When the power rod 25 is in the inner cam groove close to the axis of the power wheel 22, the first spring 27 is in a contracted state under the compression of the annular step.

[0062] When the drive shaft 21 rotates and drives the power wheel 22 to rotate, the power rod 25 will slide on the surface of the inner cam groove. The sliding direction is from a position away from the axis of the power wheel 22 to a position close to the axis of the power wheel 22. During the sliding process, the first spring 27 continuously contracts. When it slides to the cross-section position, under the elastic force of the first spring 27, the power rod 25 will quickly slide to a position away from the axis of the power wheel 22. At the same time, the cleaning part 17 will also quickly hit the annular filter cartridge 12, thereby vibrating and cleaning the material powder carried on the vent hole, causing it to fall into the collection pipe 8 below.

[0063] The power wheel 22 is mounted on the drive shaft 21. Due to the influence of the reduction gear set, the rotation speed of the power wheel 22 is faster than that of the annular filter cartridge 12, thereby improving the cleaning effect of the cleaning section 17 on the annular filter cartridge 12. At the same time, it ensures that the cleaning effect of the cleaning section 17 on the annular filter cartridge 12 is not affected by the change in the rotation speed of the annular filter cartridge 12.

[0064] Example 1:

[0065] like Figures 9-10 As shown, the adjustment assembly includes a sensor cylinder 15 mounted on a baffle 18. The sensor cylinder 15 has openings on both its upper and lower sides. The upper opening of the sensor cylinder 15 is connected to the ventilation chamber, and the lower opening of the sensor cylinder 15 is connected to the cleaning chamber. A pressure plate 28 is slidably connected inside the sensor cylinder 15. A second spring 29 is installed between the pressure plate 28 and the upper side of the sensor cylinder 15. The second spring 29 is used to apply pressure to the pressure plate 28 against the lower opening of the sensor cylinder 15. A motor control assembly is installed inside the sensor cylinder 15. The motor control assembly is used to control the rotation speed of the first drive 6 and the second drive 13 under the action of the pressure plate 28.

[0066] The motor control assembly includes a reduction chamber 30 vertically installed inside the induction cylinder 15. A reduction rod 31 is slidably connected inside the reduction chamber 30. Oil is provided inside the reduction chamber 30, and the oil is above the reduction rod 31. Under natural conditions, the reduction rod 31 is located at the lower end of the reduction chamber 30 under the pressure of its own weight and the weight of the oil. The lower end of the reduction chamber 30 is provided with an opening. At this time, most of the area of ​​the reduction rod 31 extends to the outside of the reduction chamber 30 through the opening at the lower end of the reduction chamber 30. The lower end of the reduction rod 31 is located near the upper end of the air pressure plate 28 within its sliding stroke range.

[0067] When the ventilation holes on the annular filter cylinder 12 in the ventilation chamber are gradually blocked by the material powder, the suction force of the impeller 5 remains unchanged, which reduces the air pressure in the ventilation chamber. Meanwhile, the lower opening of the induction cylinder 15 is connected to the atmosphere in the cleaning chamber. Under the action of air pressure, the air pressure plate 28 will overcome the elastic force of the second spring 29 and slide upward. When the upward sliding air pressure plate 28 contacts the lower end of the deceleration rod 31, it will also push the deceleration rod 31 to slide towards the upper part of the inner side of the deceleration chamber 30.

[0068] A contact sensor is installed at the upper end of the deceleration chamber 30. The contact sensor is connected to the PLC control system. When the air pressure plate 28 slides upward and pushes the deceleration rod 31 to the position where it contacts the contact sensor, the contact sensor will send a signal to the PLC control system to control the first drive 6 to reduce its speed. The PLC control system sets the speed value of the first drive 6 to be reduced once. After the speed of the first drive 6 is reduced, the wind speed in the drying chamber 2 will also be reduced, thereby reducing the amount of material powder that is carried into the air duct 3 due to the excessive wind speed.

[0069] An adjusting block 39 is installed inside the induction cylinder 15. The adjusting block 39 has a temporary storage compartment 34 and a speed-up compartment 33. A contact block 36 is slidably connected to the inner side of the speed-up compartment 33. A third spring 35 is fixedly installed between the contact block 36 and the upper side of the speed-up compartment 33. The contact block 36 is adapted to be in the lower position of the speed-up compartment 33 under the elastic force of the third spring 35. A resistor strip 32 is installed on one side of the speed-up compartment 33. The lower end of the resistor strip 32 is in contact with the contact block 36. A power source is electrically connected to one side of the contact block 36. The end of the resistor strip 32 away from the contact block 36 is electrically connected to the second drive 13. The lower ends of the temporary storage compartment 34 and the speed-up compartment 33 are both connected to the upper end pipeline of the deceleration compartment 30.

[0070] When the pressure plate 28 slowly slides upward, pushing the deceleration rod 31 upward, the oil in the deceleration chamber 30 will be squeezed out from the upper side of the deceleration chamber 30 by the deceleration rod 31 and enter the pipeline. Because the contact block 36 in the speed-up chamber 33 is blocked by the elastic force of the third spring 35, the oil will be squeezed into the temporary storage chamber 34. When a large amount of material powder blocks the vent hole of the annular filter cartridge 12, the air pressure in the vent chamber will drop sharply, causing the pressure plate 28 to slide quickly towards the upper end of the induction cylinder 15, and also causing the deceleration rod 31 to quickly squeeze the oil in the deceleration chamber 30 out of the deceleration chamber 30. At this time, the instantaneous pressure of the squeezed oil is relatively large. This will apply greater pressure to the contact block 36, thereby lifting the contact block 36, causing the third spring 35 to contract, and the oil to enter the speed-up chamber 33. This also shortens the distance between the lifted contact block 36 and the upper end of the resistor bar 32, increasing the current obtained by the second drive 13. This causes the annular filter cartridge 12 to rotate rapidly, causing the blocked vent hole to rotate quickly into the cleaning chamber for cleaning, thus avoiding damage to the fan components caused by prolonged blockage. When the air pressure in the venting chamber is normal after the vent hole blockage is cleared, the pressure plate 28 will fall back to the bottom of the induction cylinder 15 under the elastic force of the second spring 29, and the oil will also return to the deceleration chamber 30 under its own weight.

[0071] A flow-limiting groove 38 is opened between the pipe connecting the speed-up chamber 33 and the speed-down chamber 30. A flow-limiting ball 37 is placed in the flow-limiting groove 38. Through the cooperation of the flow-limiting ball 37 and the flow-limiting groove 38, the flow rate of oil entering the speed-up chamber 33 is not affected, while the flow rate of oil flowing back from the speed-up chamber 33 to the speed-down chamber 30 will be reduced under the influence of the flow-limiting ball 37. This slows down the fall speed of the contact block 36, increases the duration of the rotation speed-up of the annular filter cartridge 12, and thus improves the cleaning speed.

[0072] Example 2:

[0073] The regulating component can also be a pressure sensor installed on the baffle 18. The pressure sensor is located in the ventilation chamber and is connected to the PLC control system. When the pressure sensor detects that the pressure in the ventilation chamber has dropped to a certain value, it can send a signal to the PLC control system to control the first drive 6 to decelerate.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air duct structure for an oven, characterized in that: include: Air duct (3), which is installed inside the oven body, is used to provide air circulation, and the upper end of the air duct (3) is connected to the upper side of the drying chamber; The PLC control system is installed on the main body of the oven. A fan assembly is installed at the lower end of the air duct (3). The fan assembly is connected to the PLC control system. The fan assembly is used to increase the air flow rate. The fan assembly is provided with an air intake and an exhaust port. The air intake is connected to the lower end of the air duct (3). The exhaust port is connected to the lower side of the drying chamber. An adjustable dust removal assembly (7) is installed at the air intake and is connected to the PLC control system. The adjustable dust removal assembly (7) includes: A dust removal assembly is installed at the air intake and is used to filter and clean the air entering the air intake. An adjustment component is installed inside the dust removal component, and the adjustment component is used to adjust the air intake speed of the fan component according to the cleaning status of the dust removal component; The dust removal assembly includes a separator wheel (11) installed on one side of the air intake. A bearing connects an annular filter cartridge (12) to the separator wheel (11). The annular filter cartridge (12) has multiple sets of ventilation holes in the circumferential direction. A baffle (18) is installed in the middle of the separator wheel (11). The baffle (18) is adapted to cooperate with the annular filter cartridge (12) to divide the separator wheel (11) into a ventilation chamber and a cleaning chamber. The ventilation chamber is connected to the air intake. The outer side of the annular filter cartridge (12) at the ventilation chamber is connected to the air duct (3). A second drive (13) is installed on the separator wheel (11). The output end of the second drive (13) is fixedly connected to the annular filter cartridge (12). The second drive (13) is used to drive the annular filter cartridge (12) to rotate circumferentially. A striking assembly is provided in the cleaning chamber. The striking assembly is used to strike and clean the part of the annular filter cartridge (12) that has rotated into the cleaning chamber. The striking assembly includes an elastic sleeve (26) mounted on a separator wheel (11). A connecting rod (16) is slidably connected to the inner side of the elastic sleeve (26). A cleaning part (17) is fixedly installed at one end of the connecting rod (16) near the annular filter cylinder (12). A power rod (25) is fixedly installed at the other end of the connecting rod (16). A first spring (27) is installed between the elastic sleeve (26) and the connecting rod (16). The first spring (27) is used to give the connecting rod (16) a force to slide towards the annular filter cylinder (12). A power wheel (22) is fixedly installed at the output end of the second drive (13). An inner cam groove is opened on the inner side of the power wheel (22). The power rod (25) is located in the inner cam groove. Wherein: the connecting rod (16) is adapted to perform a cyclical motion of slowly moving away from and then quickly moving closer to the annular filter cartridge (12) when the second drive (13) is running; The inner sides of the separator wheel (11) are rotatably connected to the annular filter cylinder (12) and the outlet roller (40) is fixedly installed. The inlet roller (14) and the outlet roller (40) are located on both sides of the baffle (18). The outlet roller (40) and the inlet roller (14) are both tangent to the outer side of the annular filter cylinder (12). The inlet roller (14) and the outlet roller (40) are both made of sponge material. The second drive (13) drives the annular filter cylinder (12) to rotate continuously, so that the air hole blocking the material powder will carry it from the inlet roller (14) into the cleaning chamber. The inlet roller (14) is tangent to the outer side of the annular filter cylinder (12) and rotates in the opposite direction as the annular filter cylinder (12) rotates, so as not to block the material powder entering the cleaning chamber. When the vent carrying the material powder rotates to the position of the impact component, the impact component shakes the material powder off the surface of the annular filter cylinder (12) by impact. The material powder slides down the side wall of the cleaning chamber and is discharged and collected. The vent through the impact component will continue to rotate with the annular filter cylinder (12). When it rotates to the outlet roller (40), the outlet roller (40) cannot rotate and is tangent to the outer side wall of the annular filter cylinder (12). Therefore, some material powder adhering to the outer surface of the annular filter cylinder (12) will be blocked in the cleaning chamber by the outlet roller (40).

2. The air duct structure of an oven according to claim 1, characterized in that: The second drive (13) is connected to the annular filter cartridge (12) by two sets of reduction gears, and the power wheel (22) is mounted on the shaft of the first set of reduction gears.

3. The air duct structure of an oven according to claim 2, characterized in that: The lower end of the separator wheel (11) is fixedly connected to a collection pipe (8), which is located below the cleaning section (17).

4. The air duct structure of an oven according to claim 3, characterized in that: The regulating component includes a pressure sensor mounted on the baffle (18), and the pressure sensor is signal-connected to the PLC control system.

5. The air duct structure of an oven according to claim 4, characterized in that: The adjustment assembly includes a sensing cylinder (15) mounted on the baffle (18), a pressure plate (28) slidably connected inside the sensing cylinder (15), a second spring (29) installed between the pressure plate (28) and the sensing cylinder (15), and a motor control assembly installed inside the sensing cylinder (15). The motor control assembly is used to control the wind speed of the fan assembly and the rotation speed of the second drive (13) under the action of the pressure plate (28).

6. The air duct structure of an oven according to claim 5, characterized in that: The motor control assembly includes a reduction chamber (30) vertically installed inside the induction cylinder (15). A reduction rod (31) is slidably connected inside the reduction chamber (30). Oil is provided inside the reduction chamber (30) and is positioned above the reduction rod (31). A contact sensor is installed at the upper end of the reduction chamber (30) and is connected to the PLC control system. The reduction rod (31) is adapted to be pressed into the reduction chamber (30) when the air pressure plate (28) slides upward. An adjusting block (39) is installed inside the induction cylinder (15). A temporary storage chamber (34) and a speed-up chamber (33) are provided inside the adjusting block (39). The speed-up chamber (33) contains... A contact block (36) is slidably connected to the side. A third spring (35) is installed between the contact block (36) and the speed-up chamber (33). The contact block (36) is adapted to be positioned at the lower end of the speed-up chamber (33) under the elastic force of the third spring (35). A resistor strip (32) is installed on one side of the speed-up chamber (33). The lower end of the resistor strip (32) is in contact with the contact block (36). A power source is electrically connected to one side of the contact block (36). The end of the resistor strip (32) away from the contact block (36) is electrically connected to the second drive (13). The lower ends of the temporary storage chamber (34) and the speed-up chamber (33) are both connected to the upper end pipeline of the deceleration chamber (30).

7. The drying air velocity adjustment method for the air duct structure of an oven according to claim 6, characterized in that: The drying air speed adjustment method includes: S1. Air entering the intake port is filtered through the vent holes on the annular filter cartridge; S2. The second drive drives the annular filter cartridge to rotate, continuously rotating the vent hole at the venting chamber into the cleaning chamber. S3. The ventilation holes in the cleaning chamber are cleaned by striking them with the dust removal component; S4. Real-time monitoring of air pressure in the ventilation chamber via adjustment components; S5. When the pressure inside the ventilation chamber gradually decreases to a certain value, control the fan assembly to reduce the wind speed. S6. When the pressure inside the ventilation chamber suddenly decreases to a certain value, the fan assembly is controlled to reduce the wind speed and increase the speed of the second drive.

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