An internet of things intelligent variable frequency coffee residue drying processing device and drying method

Abstract

This invention relates to the field of coffee grounds drying technology, specifically to an IoT-enabled intelligent variable frequency coffee grounds drying device and method, comprising a mixing tank, a feeding funnel, a double-layer mixing mechanism, a drive unit, a weighing sensor, a temperature and humidity sensor, and a fan. The double-layer mixing mechanism includes a lower mixing blade, an upper mixing blade, a main shaft, and a lifting shaft. The lower mixing blade is connected to the main shaft, and the upper mixing blade is connected to the lifting shaft. The drive unit is capable of docking with and driving the main shaft to rotate, and the drive unit integrates a variable frequency control system and an IoT module. The weighing sensor is used to monitor changes in the mass of coffee grounds in the mixing tank. The temperature and humidity sensor is used to monitor changes in the temperature and humidity of the coffee grounds. The fan is used to blow airflow within the housing. This invention utilizes a double-layer mixing mechanism and a drive unit to scrape away highly adhesive coffee grounds adhering to the inner wall of the feeding funnel.

Description

Technical Field

[0001] This invention relates to the field of coffee grounds drying technology, specifically to an IoT-enabled intelligent variable frequency coffee grounds drying device and a method for drying coffee grounds. Background Technology

[0002] Coffee grounds are produced in large quantities, have a high moisture content, and are highly viscous, so they usually require drying and volume reduction during recycling. Currently, most drying equipment for biomass waste on the market uses hot air drying and mechanical stirring as its core principles. It mainly consists of a drying cylinder, heating elements, stirring blades, a feed hopper, and a conventional detection and control unit. Drying is achieved by the stirring blades turning the material and using hot air, which is a common method for processing coffee grounds in the industry.

[0003] However, existing coffee grounds drying devices generally have obvious defects: coffee grounds themselves have a high moisture content and are very sticky. During the process of falling through the feed hopper, a large amount of them will stick to the inner wall of the feed hopper and are difficult to completely detach by their own weight. As the usage time increases, the sticky coffee grounds continue to accumulate and harden, gradually reducing the cross-sectional area of ​​the feed channel, eventually leading to poor feeding, material interruption, or even complete blockage of the feed hopper, forcing the device to be stopped for cleaning. Summary of the Invention

[0004] To address the aforementioned issues, an IoT-based intelligent variable frequency coffee grounds drying device is provided. By incorporating a double-layer stirring mechanism and a drive unit, it effectively scrapes off highly viscous coffee grounds adhering to the inner wall of the discharge funnel, preventing coffee grounds from accumulating and hardening, narrowing the channel, and causing feed blockage.

[0005] To address the problems of existing technologies, this invention provides an IoT-enabled intelligent variable frequency coffee grounds drying device, comprising a housing, a frame, a mixing tank, a discharge funnel, a double-layer mixing mechanism, a drive unit, a weighing sensor, a temperature and humidity sensor, and a fan. The housing contains a heating device. The frame is located in the lower part of the housing. The mixing tank is located in the middle of the housing. The discharge funnel is positioned above the mixing tank. The double-layer mixing mechanism is located inside the mixing tank and includes a lower mixing blade, an upper mixing blade, a coaxially arranged main shaft, and a lifting shaft. The lower mixing blade is connected to the main shaft, and the upper mixing blade is connected to the lifting shaft. One end of the main shaft extends out of the mixing tank and is connected to a bearing in the mixing tank. The drive unit is located within the frame and can connect to and drive the main shaft to rotate. The drive unit integrates a variable frequency control system and an IoT module. The weighing sensor monitors changes in the mass of coffee grounds inside the mixing tank. The temperature and humidity sensor monitors changes in the temperature and humidity of the coffee grounds. The fan blows air through the housing.

[0006] Preferably, the upper stirring blade includes a multi-stage telescopic arm structure and a scraper; the multi-stage telescopic arm structure is connected to the lifting shaft, and the multi-stage telescopic arm structure can adaptively adjust its length under centrifugal force; the scraper is connected to the multi-stage telescopic arm structure.

[0007] Preferably, the inner wall of the main shaft is provided with a sliding groove along the axial direction, and the lifting shaft is provided with a locking block that engages and slides with the sliding groove.

[0008] Preferably, the drive unit includes a turntable and a first lifting drive assembly; a docking transmission head is coaxially disposed in the middle of the turntable; the first lifting drive assembly is used to drive the docking transmission head to rise and fall and to drively connect it to the main shaft.

[0009] Preferably, the driving unit further includes a rotary driving component for driving the turntable to rotate around its own axis.

[0010] Preferably, the drive unit further includes a centering component, which is used to limit the rotational movement of the turntable around a fixed axis.

[0011] Preferably, the first lifting drive assembly includes a lifting assembly and a guide assembly; the lifting assembly is used to drive the turntable to move vertically up and down; the guide assembly is used to maintain the balance of the turntable during lifting and lowering.

[0012] Preferably, the drive unit further includes a second lifting drive assembly, which includes a second lifting driver, and the second lifting driver is used to drive the lifting shaft to move up and down in the vertical direction.

[0013] Preferably, the second lifting drive assembly further includes a rolling docking assembly, which is disposed at the output end of the second lifting drive.

[0014] A method for drying coffee grounds, applied to an IoT-enabled intelligent variable frequency coffee grounds drying and processing device, includes the following steps: S1. Coffee grounds are fed into the mixing tank through the feeding funnel, and the weighing sensor monitors the initial material mass. S2. The drive unit drives the main shaft of the double-layer stirring mechanism to rotate synchronously with the lifting shaft. The lifting shaft drives the upper stirring blade to move upward and extend into the discharge funnel to scrape and clean the coffee grounds attached to the inner wall of the discharge funnel. S3. After cleaning, the lifting shaft drives the upper stirring blade to return to the mixing tank and cooperate with the lower stirring blade; the heating device and fan inside the housing are started, the temperature and humidity sensor monitors the temperature and humidity inside the mixing tank in real time, and the drive unit adjusts the stirring speed and fan airflow through the frequency conversion control system to stir and dry the coffee grounds. S4. When the material mass monitored by the weighing sensor and the temperature and humidity monitored by the temperature and humidity sensor reach the set values, the drive unit, heating device and fan stop working, and the coffee grounds drying is completed.

[0015] The advantages of this invention application compared to the prior art are: 1. This invention application includes a double-layer stirring mechanism, a drive unit, a weighing sensor, a temperature and humidity sensor, and a fan. The double-layer stirring mechanism includes a lower stirring blade, an upper stirring blade, a main shaft, and a lifting shaft. It can lift and lower the discharge hopper to clean it and evenly stir coffee grounds in the mixing tank. The drive unit provides rotational power and realizes frequency conversion and IoT intelligent control. The weighing sensor monitors the material quality, the temperature and humidity sensor collects temperature and humidity data, and the fan, in conjunction with the heating device, forms a hot air circulation. This device, by setting a liftable and rotating upper stirring blade, can scrape off the highly sticky coffee grounds adhering to the inner wall of the discharge hopper, avoiding problems such as coffee grounds accumulation and caking, channel narrowing, and feed blockage. It eliminates the need for manual shutdown for cleaning, ensuring continuous and smooth feeding.

[0016] 2. This invention application features a multi-stage telescopic arm structure and a scraper. The lifting shaft drives the upper stirring blade to rotate as a whole. Under the action of centrifugal force, the upper stirring blade adaptively adjusts its extension length, causing the scraper to expand outward and closely fit the inner wall contour. When the lifting shaft drives the upper stirring blade to rise, the scraper scrapes and cleans the inner wall of the discharge funnel. When it falls back into the mixing tank, the scraper agitates the coffee grounds with a larger radial coverage area. The multi-stage telescopic arm structure achieves adaptive extension and retraction by relying on centrifugal force, thereby achieving both complete contact with the inner wall of the discharge funnel to clear blockages and uniform agitation of coffee grounds with a larger coverage area in the mixing tank.

[0017] 3. In this invention application, the main shaft cooperates with the locking block on the lifting shaft through an inner wall groove. The groove rotates with the main shaft and applies a circumferential force to the locking block, driving the lifting shaft to rotate synchronously, so that the upper and lower stirring blades can achieve synchronous stirring. The lifting shaft can move axially under the drive of external force, and the locking block slides linearly along the groove, keeping the circumferential transmission unchanged. The groove and locking block cooperation structure not only realizes the transmission of rotational power from the main shaft to the lifting shaft, but also provides a stable axial movement space for the lifting shaft, so that the lifting shaft has both synchronous rotation and independent lifting functions, and the movement is free from interference. Attached Figure Description

[0018] Figure 1 This is a perspective view of an IoT-based intelligent variable frequency coffee grounds drying device according to this invention application.

[0019] Figure 2 This is a three-dimensional sectional view of an IoT-based intelligent variable frequency coffee grounds drying device according to this invention application.

[0020] Figure 3 This is a perspective view of the double-layer stirring mechanism, drive unit, temperature and humidity sensor and fan in an IoT intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0021] Figure 4 This is a perspective view of the upper stirring blade and lifting shaft in an IoT-based intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0022] Figure 5 This is a three-dimensional sectional view of the multi-stage telescopic arm structure and scraper in an IoT-based intelligent variable frequency coffee grounds drying and processing device, as described in this invention application.

[0023] Figure 6 This is a perspective view of the main shaft and lifting shaft in an IoT-based intelligent variable frequency coffee grounds drying device according to this invention application.

[0024] Figure 7 This is a perspective view of the turntable, rotation drive assembly, centering assembly, first lifting drive assembly, and second lifting drive assembly in an IoT intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0025] Figure 8 This is a perspective view of the turntable, gear ring, gears, and rotary drive in an IoT-based intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0026] Figure 9 This is a perspective view of the turntable, ring frame, and roller in an IoT-based intelligent variable frequency coffee grounds drying device according to this invention application.

[0027] Figure 10 This is a perspective view of the turntable, centering component, and first lifting drive component in an IoT-based intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0028] Figure 11 This is a perspective view of the centering component, lifting component, and guiding component in an IoT-based intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0029] Figure 12 This is a perspective view of the second lifting drive and the rolling docking component in an IoT-based intelligent variable frequency coffee grounds drying and processing device according to this invention application.

[0030] The diagram is labeled as follows: 1. Shell; 2. Frame; 3. Mixing tank; 4. Discharge hopper; 5. Double-layer mixing mechanism; 51. Lower mixing blade; 52. Upper mixing blade; 521. Multi-stage telescopic arm structure; 5211. Fixed arm; 5212. Movable arm; 5213. Return spring; 522. Scraper; 53. Main shaft; 531. Slide groove; 54. Lifting shaft; 541. Clamping block; 6. Drive unit; 61. Turntable; 611. Connecting transmission head; 62. Rotary drive assembly; 621. Gear. 622. Ring; 623. Gear; 624. Rotary actuator; 63. Centering assembly; 635. Ring frame; 636. Roller; 6321. Slot; 64. First lifting drive assembly; 646. Lifting assembly; 647. First lifting actuator; 648. Guide assembly; 649. Guide rod; 640. Slider; 650. Second lifting drive assembly; 661. Second lifting actuator; 652. Rolling docking assembly; 7. Weighing sensor; 8. Temperature and humidity sensor; 9. Fan. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1 to 12 The following is an IoT-based intelligent variable frequency coffee grounds drying device: It includes a housing 1, a frame 2, a mixing tank 3, a discharge funnel 4, a double-layer mixing mechanism 5, a drive unit 6, a weighing sensor 7, a temperature and humidity sensor 8, and a fan 9. A heating device is installed inside the housing 1. The frame 2 is located in the lower part of the housing 1. The mixing tank 3 is located in the middle part of the housing 1. The discharge funnel 4 is located above the mixing tank 3. The double-layer mixing mechanism 5 is located inside the mixing tank 3 and includes a lower mixing blade 51, an upper mixing blade 52, and a coaxially arranged main shaft 5. The upper stirring blade 52 is connected to the lifting shaft 54, and the lower stirring blade 51 is connected to the main shaft 53. One end of the main shaft 53 extends out of the mixing tank 3 and is connected to the bearing of the mixing tank 3. The drive unit 6 is located inside the frame 2 and can dock with and drive the main shaft 53 to rotate. The drive unit 6 integrates a frequency conversion control system and an Internet of Things module. The weighing sensor 7 is used to monitor the change in the mass of coffee grounds in the mixing tank 3. The temperature and humidity sensor 8 is used to monitor the change in the temperature and humidity of the coffee grounds. The fan 9 is used to blow the gas flow inside the housing 1.

[0033] During operation, coffee grounds are fed into the mixing tank 3, located in the middle of the housing 1, via a discharge funnel 4 above the mixing tank 3. A weighing sensor 7 on the frame 2 monitors and collects the initial mass of the coffee grounds in the mixing tank 3 in real time. A drive unit 6 connects to the main shaft 53 extending from the mixing tank 3 and provides rotational power. The rotation of the main shaft 53 drives the coaxially arranged lifting shaft 54, lower stirring blade 51, and upper stirring blade 52 to rotate synchronously. The upper stirring blade 52 moves upward along the main shaft 53 and extends into the discharge funnel 4, scraping and cleaning the coffee grounds adhering to the inner wall of the funnel to prevent material adhesion and blockage. After cleaning, the upper stirring blade 52 falls back into the mixing tank 3 along the axial direction, cooperating with the lower stirring blade 51 to synchronously agitate and stir the coffee grounds inside. A heating device inside the housing 1 activates to provide drying heat, and a fan 9 drives the directional flow of gas within the housing 1, forming a hot air circulation to enhance heat exchange between the material and the hot air. A temperature and humidity sensor 8 continuously collects temperature and humidity data of the coffee grounds. The drive unit 6 adjusts its operating parameters according to the material's condition via a frequency conversion control system, while the IoT module performs data acquisition and remote monitoring. When the data detected by the weighing sensor 7 and the temperature and humidity sensor 8 reach the preset drying threshold, the drive unit 6, heating device, and fan 9 automatically stop operating, completing the drying of the coffee grounds. This device features a liftable and rotating upper stirring blade 52, which scrapes away the highly adhesive coffee grounds adhering to the inner wall of the discharge funnel 4, preventing coffee grounds from accumulating and hardening, narrowing the channel, and causing feed blockages. This eliminates the need for manual shutdown for cleaning, ensuring continuous and smooth feeding.

[0034] Reference Figure 3 , Figure 4 and Figure 5 As shown: The upper stirring blade 52 includes a multi-stage telescopic arm structure 521 and a scraper 522; the multi-stage telescopic arm structure 521 is connected to the lifting shaft 54, and the multi-stage telescopic arm structure 521 can adaptively adjust its length under the action of centrifugal force; the scraper 522 is connected to the multi-stage telescopic arm structure 521.

[0035] Specifically, the multi-stage telescopic arm structure 521 includes a fixed arm 5211, multiple movable arms 5212, and multiple return springs 5213. The fixed arm 5211 is fixedly connected to the lifting shaft 54. The multiple movable arms 5212 are sequentially sleeved from the outside to the inside, and the multiple movable arms 5212 are slidably disposed inside the fixed arm 5211. The multiple return springs 5213 respectively provide a thrust towards the inside of the fixed arm 5211 to the multiple movable arms 5212.

[0036] During operation, the lifting shaft 54 ​​drives the upper stirring blade 52 to rotate synchronously. The centrifugal force generated by the rotation acts on the multi-stage telescopic arm structure 521, overcoming the elasticity of the return spring 5213, causing multiple movable arms 5212 to extend outwards sequentially, adaptively adjusting the overall extension length. The scraper 522 expands outwards synchronously with the multi-stage telescopic arm structure 521 and closely conforms to the inner wall contour. When the lifting shaft 54 ​​drives the upper stirring blade 52 to rise into the discharge funnel 4, the scraper 522 rotates along the inner wall of the funnel and scrapes off the attached coffee grounds. When the lifting shaft 54 ​​drives the upper stirring blade 52 back into the mixing tank 3, the multi-stage telescopic arm structure 521 remains extended, and the scraper 522 agitates the coffee grounds in the tank with a larger radial coverage area. The multi-stage telescopic arm structure 521 achieves adaptive extension and retraction by relying on centrifugal force, thus achieving both complete contact with the inner wall of the discharge funnel 4 to clear blockages and uniform agitation of coffee grounds with a larger coverage area in the mixing tank 3.

[0037] Reference Figure 6 As shown: The inner wall of the main shaft 53 is provided with a sliding groove 531 along the axial direction, and the lifting shaft 54 ​​is provided with a locking block 541 that engages and slides with the sliding groove 531.

[0038] When the drive unit 6 drives the main shaft 53 to rotate, the groove 531 on the inner wall of the main shaft 53 rotates synchronously with the main shaft 53. The groove 531 applies a circumferential force to the locking block 541 through its side wall, thereby driving the lifting shaft 54 ​​to rotate synchronously with the main shaft 53, so that the upper stirring blade 52 and the lower stirring blade 51 can achieve synchronous stirring. When it is necessary to adjust the working position of the upper stirring blade 52, the lifting shaft 54 ​​can move along the axial direction of the main shaft 53 under the drive of external force, and the locking block 541 slides linearly along the groove 531. Only axial relative displacement occurs between the lifting shaft 54 ​​and the main shaft 53, and the circumferential transmission relationship remains unchanged. This groove 531 and locking block 541 cooperation structure not only realizes the transmission of rotational power from the main shaft 53 to the lifting shaft 54, but also provides a stable axial movement space for the lifting shaft 54, so that the lifting shaft 54 ​​has both synchronous rotation and independent lifting functions, and the movement is free from interference.

[0039] Reference Figure 7 As shown: The drive unit 6 includes a turntable 61 and a first lifting drive assembly 64; a docking transmission head 611 is coaxially arranged in the middle of the turntable 61; the first lifting drive assembly 64 is used to drive the docking transmission head 611 to rise and fall and to be connected to the main shaft 53 for transmission.

[0040] When the device is ready to enter the drying state, the first lifting drive assembly 64 drives the turntable 61 and the docking transmission head 611 to move vertically upward, so that the docking transmission head 611 docks with the end of the main shaft 53 extending from the mixing tank 3 and forms a transmission engagement, establishing a connection channel for subsequent rotational power transmission. After the device completes the drying operation, the first lifting drive assembly 64 drives the turntable 61 and the docking transmission head 611 to move downward, so that the docking transmission head 611 disengages from the main shaft 53 and releases the transmission connection. This achieves rapid docking and disengagement between the drive unit 6 and the mixing main shaft 53, ensuring stable transmission of rotational power during the drying process and separating the drive end from the double-layer mixing mechanism 5 when transferring the mixing tank 3.

[0041] Reference Figure 7 and Figure 8 As shown: The drive unit 6 further includes a rotary drive component 62, which is used to drive the turntable 61 to rotate around its own axis.

[0042] Specifically, the rotary drive assembly 62 includes a gear ring 621, a gear 622, and a rotary driver 623. The gear ring 621 is coaxially and fixedly connected to the turntable 61. The gear 622 meshes with the gear ring 621. The rotational power of the rotary driver 623 is transmitted to the gear ring 621 through the gear 622.

[0043] When the device enters the working state, the rotary driver 623 starts and outputs rotational power. The power is transmitted to the meshing gear ring 621 via the gear 622. The gear ring 621 drives the turntable 61 to rotate stably around its own axis. The docking transmission head 611 in the middle of the turntable 61 rotates synchronously with the turntable 61. During the process of the docking transmission head 611 rising to engage with the main shaft 53, the rotary drive assembly 62 controls the docking transmission head 611 to rotate slowly, so that the transmission part of the docking transmission head 611 can be aligned and smoothly engaged in the sliding groove 531 on the inner wall of the main shaft 53, completing the power docking. This rotary drive structure smoothly drives the turntable 61 and the docking transmission head 611 to rotate through the meshing transmission of the gear 622 and the gear ring 621, thereby adjusting the circumferential position of the docking transmission head 611 so that it can smoothly engage with the sliding groove 531 of the main shaft 53, effectively avoiding misalignment during docking.

[0044] Reference Figure 7 and Figure 9 As shown: The drive unit 6 further includes a centering component 63, which is used to restrict the turntable 61 from rotating around a fixed axis.

[0045] Specifically, the centering component 63 includes an annular frame 631 and multiple rollers 632. The annular frame 631 is coaxially arranged with the turntable 61, and the multiple rollers 632 are circumferentially arranged on the annular frame 631. The side wall of the rollers 632 is provided with a slot 6321, and the edge of the turntable 61 is engaged in the slot 6321.

[0046] When the rotary drive assembly 62 drives the turntable 61 to rotate around its own axis, the annular frame 631 and the roller 632 remain relatively fixed. The edge of the turntable 61 is circumferentially limited and radially constrained within the groove 6321 of the roller 632. The roller 632 rolls along with the turntable 61, limiting the radial offset and wobbling of the turntable 61 through rolling support. The centering assembly 63, through the cooperation of the roller 632 and the annular frame 631, continuously constrains the movement trajectory of the turntable 61, ensuring that the turntable 61 always rotates around the set fixed axis during rotation, without eccentricity, wobble, or radial movement. It always maintains a coaxial state with the main shaft 53, thereby avoiding misalignment, jamming, and uneven wear between the docking transmission head 611 and the main shaft 53 due to eccentricity and wobbling. This effectively ensures the coaxiality and stability of the drive unit 6 and the main shaft 53 transmission docking, improving the operating accuracy and service life of the device.

[0047] Reference Figure 7 , Figure 10 and Figure 11 As shown: The first lifting drive assembly 64 includes a lifting assembly 641 and a guide assembly 642; the lifting assembly 641 is used to drive the turntable 61 to rise and fall vertically; the guide assembly 642 is used to maintain the balance of the turntable 61 during the rise and fall.

[0048] Specifically, the lifting assembly 641 includes at least two first lifting drivers 6411, which are symmetrically arranged about the center of the turntable 61. The output end of the first lifting driver 6411 is connected to the ring frame 631. The guide assembly 642 includes multiple guide rods 6421 and multiple sliders 6422. The multiple guide rods 6421 are arranged around the circumference of the ring frame 631, and the axis of the guide rods 6421 is vertical. The sliders 6422 are slidably arranged on the guide rods 6421, and the sliders 6422 are fixedly connected to the ring frame 631.

[0049] When the turntable 61 needs to be raised or lowered, multiple symmetrically arranged first lifting actuators 6411 synchronously output vertical power, pushing the ring frame 631 and the turntable 61 to move up and down as a whole. At the same time, the slider 6422 fixed to the ring frame 631 slides linearly along the vertical guide rod 6421, constraining and limiting the movement direction of the ring frame 631 and the turntable 61, counteracting the lateral force and tilting tendency generated during the lifting process, and maintaining the horizontal posture of the turntable 61. The lifting assembly 641 provides stable lifting power, and the guide assembly 642 ensures the movement trajectory. The two work together to ensure that the lifting process of the turntable 61 is tilt-free, jam-free, and offset-free, thereby effectively avoiding the tilting and jamming problems of the turntable 61 during lifting and lowering, and ensuring that the docking transmission head 611 and the main shaft 53 can accurately complete docking and disengagement.

[0050] Reference Figure 2 and Figure 12As shown: The drive unit 6 further includes a second lifting drive component 65, which includes a second lifting driver 651. The second lifting driver 651 is used to drive the lifting shaft 54 ​​to move up and down in the vertical direction.

[0051] When the device performs the cleaning action on the inner wall of the discharge funnel 4, the second lifting drive 651 starts and outputs a vertically upward driving force, directly pushing the lifting shaft 54 ​​to move upward linearly along the axis of the main shaft 53, thereby driving the upper stirring blade 52 connected to the lifting shaft 54 ​​to rise synchronously, so that the upper stirring blade 52 extends into the discharge funnel 4 to perform the wall scraping and unblocking operation; when the cleaning is completed and the in-bucket drying and stirring is required, the second lifting drive 651 drives the lifting shaft 54 ​​to move downward in the vertical direction, driving the upper stirring blade 52 back into the stirring bucket 3, so that the upper stirring blade 52 and the lower stirring blade 51 work together to stir the coffee grounds. The second lifting drive assembly 65 independently controls the lifting action of the lifting shaft 54, without interfering with the rotation drive and the first lifting drive. It can control the lifting position and movement stroke of the upper stirring blade 52 according to the working stage, thereby realizing the position switching of the upper stirring blade 52, so that the upper stirring blade 52 has the dual functions of unblocking the discharge funnel 4 and stirring in the stirring bucket 3.

[0052] Reference Figure 12 As shown: The second lifting drive assembly 65 further includes a rolling docking assembly 652, which is disposed at the output end of the second lifting drive 651.

[0053] Specifically, the rolling docking component 652 includes universal ball bearings.

[0054] When the second lifting actuator 651 drives the lifting shaft 54 ​​to perform vertical lifting motion, the universal ball bearings form rolling contact with the end face of the lifting shaft 54. Simultaneously, the lifting shaft 54 ​​rotates under the drive of the main shaft 53. During rotation, relative rolling occurs between the lower end face of the lifting shaft 54 ​​and the universal ball bearings, rather than direct sliding friction. The lifting driving force of the second lifting actuator 651 is smoothly transmitted to the lifting shaft 54 ​​via the rolling docking assembly 652, driving its up and down movement. While transmitting lifting power, the rolling docking assembly 652 does not obstruct the normal rotation of the lifting shaft 54, ensuring that the lifting and rotational movements do not interfere with each other. The rolling docking with the lifting shaft 54 ​​via the universal ball bearings reduces frictional resistance and contact surface wear during the combined rotation and lifting motion of the lifting shaft 54, preventing motion interference between the drive end and the rotating shaft, and effectively improving the smoothness and stability of the lifting action.

[0055] A method for drying coffee grounds, applied to an IoT-enabled intelligent variable frequency coffee grounds drying and processing device, includes the following steps: S1. Coffee grounds are fed into the mixing tank 3 through the feeding funnel 4, and the weighing sensor 7 monitors the initial material mass. S2. The drive unit 6 drives the main shaft 53 of the double-layer stirring mechanism 5 to rotate synchronously with the lifting shaft 54. The lifting shaft 54 ​​drives the upper stirring blade 52 to move upward and extend into the discharge funnel 4 to scrape and clean the coffee grounds attached to the inner wall of the discharge funnel 4. S3. After cleaning, the lifting shaft 54 ​​drives the upper stirring blade 52 to return to the stirring tank 3 and cooperate with the lower stirring blade 51; the heating device and fan 9 inside the housing 1 are started, the temperature and humidity sensor 8 monitors the temperature and humidity inside the stirring tank 3 in real time, and the drive unit 6 adjusts the stirring speed and the air volume of the fan 9 through the frequency conversion control system to stir and dry the coffee grounds. S4. When the material mass monitored by the weighing sensor 7 and the temperature and humidity monitored by the temperature and humidity sensor 8 reach the set values, the drive unit 6, the heating device and the fan 9 stop working, and the coffee grounds drying is completed.

[0056] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. An IoT-based intelligent variable frequency coffee grounds drying and processing device, characterized in that, It includes a housing (1), a frame (2), a mixing tank (3), a discharge hopper (4), a double-layer mixing mechanism (5), a drive unit (6), a weighing sensor (7), a temperature and humidity sensor (8), and a fan (9); The housing (1) is equipped with a heating device inside; The frame (2) is located in the lower part of the housing (1); The mixing tank (3) is located in the middle of the shell (1); The discharge funnel (4) is positioned above the mixing tank (3); The double-layer stirring mechanism (5) is disposed inside the stirring tank (3). The double-layer stirring mechanism (5) includes a lower stirring blade (51), an upper stirring blade (52), a main shaft (53) and a lifting shaft (54) arranged coaxially. The lower stirring blade (51) is connected to the main shaft (53), the upper stirring blade (52) is connected to the lifting shaft (54), and one end of the main shaft (53) extends out of the stirring tank (3) and is connected to the bearing of the stirring tank (3). The drive unit (6) is located inside the frame (2) and can connect to and drive the spindle (53) to rotate. The drive unit (6) integrates a frequency conversion control system and an Internet of Things module. The weighing sensor (7) is used to monitor the change in the mass of coffee grounds in the mixing tank (3); The temperature and humidity sensor (8) is used to monitor changes in the temperature and humidity of coffee grounds; The fan (9) is used to blow the gas flow inside the housing (1).

2. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 1, characterized in that, The upper stirring blade (52) includes a multi-stage telescopic arm structure (521) and a scraper (522). The multi-stage telescopic arm structure (521) is connected to the lifting shaft (54), and the multi-stage telescopic arm structure (521) can adaptively adjust its length under the action of centrifugal force; The scraper (522) is connected to the multi-stage telescopic arm structure (521).

3. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 1, characterized in that, The inner wall of the main shaft (53) is provided with a sliding groove (531) along the axial direction, and the lifting shaft (54) is provided with a locking block (541) that engages and slides with the sliding groove (531).

4. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 1, characterized in that, The drive unit (6) includes a turntable (61) and a first lifting drive assembly (64). A docking transmission head (611) is coaxially provided in the middle of the turntable (61). The first lifting drive assembly (64) is used to drive the docking transmission head (611) to lift and connect with the main shaft (53) in a transmission connection.

5. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 4, characterized in that, The drive unit (6) further includes a rotary drive assembly (62) for driving the turntable (61) to rotate around its own axis.

6. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 5, characterized in that, The drive unit (6) further includes a centering component (63) for limiting the rotation of the turntable (61) around a fixed axis.

7. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 4, characterized in that, The first lifting drive assembly (64) includes a lifting assembly (641) and a guide assembly (642). The lifting assembly (641) is used to drive the turntable (61) to move vertically up and down; The guide assembly (642) is used to maintain the balance of the turntable (61) during lifting and lowering.

8. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 4, characterized in that, The drive unit (6) further includes a second lifting drive assembly (65), which includes a second lifting driver (651) for driving the lifting shaft (54) to move up and down in the vertical direction.

9. The IoT-based intelligent variable frequency coffee grounds drying and processing device according to claim 8, characterized in that, The second lifting drive assembly (65) further includes a rolling docking assembly (652), which is disposed at the output end of the second lifting drive (651).

10. A method for drying coffee grounds, applied to an IoT-based intelligent variable frequency coffee grounds drying and processing device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Coffee grounds are fed into the mixing tank (3) through the feeding funnel (4), and the weighing sensor (7) monitors the initial material mass. S2. The drive unit (6) drives the main shaft (53) of the double-layer stirring mechanism (5) to rotate synchronously with the lifting shaft (54). The lifting shaft (54) drives the upper stirring blade (52) to move upward and extend into the discharge funnel (4) to scrape and clean the coffee grounds attached to the inner wall of the discharge funnel (4). S3. After cleaning, the lifting shaft (54) drives the upper stirring blade (52) to return to the stirring tank (3) and cooperate with the lower stirring blade (51); the heating device and fan (9) inside the housing (1) are started, the temperature and humidity sensor (8) monitors the temperature and humidity inside the stirring tank (3) in real time, and the drive unit (6) adjusts the stirring speed and the air volume of the fan (9) through the frequency conversion control system to stir and dry the coffee grounds; S4. When the material mass monitored by the weighing sensor (7) and the temperature and humidity monitored by the temperature and humidity sensor (8) reach the set value, the drive unit (6), the heating device and the fan (9) stop working and the coffee grounds drying is completed.

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