Mulberry leaf spin dryer

Abstract

This utility model discloses a mulberry leaf spin-drying device, comprising: a shell, a roller assembly, and a direct-drive motor. The roller assembly includes an outer cylinder and an inner cylinder, with the inner cylinder coaxially disposed within the outer cylinder. Both the outer and inner cylinders have an open end, and the inner cylinder has drainage holes in its wall. The direct-drive motor is coaxially disposed on the outer wall of the closed end of the outer cylinder. A rotating shaft is coaxially disposed on the outer wall of the closed end of the inner cylinder, passing through the closed end of the outer cylinder and fixedly connected to the output of the direct-drive motor. The rotating shaft is rotatably connected to the closed end of the outer cylinder. A drain hole is provided on the wall of the outer cylinder near its closed end, and a drain pipe is connected to the drain hole. A drain hole is provided on the lower part of the side wall of the shell, and the drain hole communicates with the drain pipe. A window is provided on the portion of the shell facing the outer and inner cylinders, and a door is hinged to the window. This utility model achieves a comprehensive improvement in dehydration efficiency, equipment reliability, and ease of operation.

Description

Technical Field

[0001] This utility model relates to the technical field of mulberry leaf processing equipment. More specifically, this utility model relates to a mulberry leaf drying device. Background Technology

[0002] In the field of mulberry leaf processing equipment, traditional centrifugal drying devices have long faced a technical bottleneck in balancing dehydration efficiency and operational performance. Most devices use a single drum structure, and the uneven distribution of centrifugal force during the dehydration process leads to incomplete moisture removal, resulting in significant differences in dehydration effects in different areas. The transmission system generally relies on multi-stage reduction mechanisms, which result in mechanical energy loss in the power transmission process, and insufficient speed stability can easily cause material damage.

[0003] The equipment exhibits significant deficiencies in sealing performance and maintainability. Traditional structures are prone to liquid splashing during high-speed operation, leading to moisture buildup in the working environment and accelerating the aging of critical components. The drainage channel design lacks an effective guidance mechanism, causing solid residues to accumulate continuously inside the equipment, and frequent cleaning and maintenance impact continuous operation. The unibody structure complicates the replacement process for core components, making maintenance time-consuming and labor-intensive.

[0004] There is a need for improvement in material selection and operation monitoring. Conventional metal components are prone to surface corrosion under humid conditions, affecting equipment lifespan and product hygiene standards. The operating interface lacks real-time feedback on the dehydration status, making it difficult for operators to accurately monitor the dehydration process and easily leading to over- or under-processing of materials. Existing solutions that attempt to improve performance by adding auxiliary systems often result in more complex equipment structures and increased operating costs. These contradictions have long constrained the improvement of the overall efficiency of processing equipment. Summary of the Invention

[0005] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0006] To achieve these objectives and other advantages according to the present invention, a mulberry leaf spin-drying device is provided, comprising: a housing, a roller assembly horizontally axially disposed within the housing, and a direct drive motor disposed within the housing for driving the roller assembly to rotate, the roller assembly comprising:

[0007] An outer cylinder and an inner cylinder, wherein the inner cylinder is coaxially disposed within the outer cylinder, and both the outer cylinder and the inner cylinder have one open end and the other closed end, with the open ends of the outer cylinder and the inner cylinder facing the same direction, and the inner cylinder has drainage holes on its wall;

[0008] The direct drive motor is coaxially mounted on the outer wall of the closed end of the outer cylinder, and a rotating shaft is coaxially mounted on the outer wall of the closed end of the inner cylinder. The rotating shaft passes through the closed end of the outer cylinder and is fixed to the output part of the direct drive motor. The rotating shaft is rotatably connected to the closed end of the outer cylinder.

[0009] The outer cylinder has a drain hole on its wall near its closed end, and a drain pipe is connected to the drain hole. The lower part of the side wall of the outer shell has a drain hole, and the drain hole is connected to the drain pipe.

[0010] A window is provided on the portion of the outer shell facing the outer cylinder and the inner cylinder, and a door is hinged to the window.

[0011] Preferably, the outer wall of the inner cylinder is provided with an annular limiting protrusion coaxial with the inner cylinder, and the inner wall of the outer cylinder is provided with at least one pair of limiting blocks. The limiting blocks are provided with limiting guide grooves that match the limiting protrusions, and the limiting protrusions are slidably connected to the limiting guide grooves.

[0012] Preferably, the inner wall of the top of the outer shell is provided with two pairs of inclined tension springs, both pairs of inclined tension springs are connected to the outer cylinder, each pair of inclined tension springs is located on the same cross section of the outer cylinder, and each pair of inclined tension springs is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder, and the two pairs of inclined tension springs are spaced apart along the axial direction of the outer cylinder.

[0013] Preferably, the bottom inner wall of the outer shell is provided with two pairs of diagonal bracing damping rods, both pairs of diagonal bracing damping rods are connected to the outer cylinder, each pair of diagonal bracing damping rods is located on the same cross section of the outer cylinder, and each pair of diagonal bracing damping rods is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder, and the two pairs of diagonal bracing damping rods are spaced apart along the axial direction of the outer cylinder.

[0014] Preferably, a spray pipe is provided between the outer cylinder and the inner cylinder. The spray pipe is arranged along the axial direction of the outer cylinder, the end of the spray pipe is closed, and spray holes are evenly spaced along the axis on the pipe wall facing the inner cylinder.

[0015] Preferably, a blower pipe is provided between the outer cylinder and the inner cylinder. The blower pipe is arranged along the axial direction of the outer cylinder, the end of the blower pipe is closed, and blower holes are evenly spaced along the axis on the pipe wall facing the inner cylinder.

[0016] Preferably, a filter box is provided around the drain hole on the lower part of the side wall of the outer casing, the drain pipe is connected to the filter box, a filter screen is provided inside the filter box, and the side wall of the outer casing is also provided with a socket for inserting and removing the filter screen. A handle is provided at the end of the filter screen near the socket, and the handle extends to the outside of the outer casing.

[0017] Preferably, the inner wall of the inner cylinder is provided with protrusions or flexible partitions are provided along the axial direction, and multiple flexible partitions are provided, which are evenly spaced along the circumference of the inner cylinder.

[0018] Preferably, a humidity sensor is provided between the inner cylinder and the outer cylinder.

[0019] Preferably, the direct drive motor is a servo direct drive motor, and the control panel for the servo direct drive motor is provided on the outer wall of the housing.

[0020] This invention offers at least the following advantages: a direct-drive motor directly drives the inner cylinder to rotate via a shaft, and centrifugal force causes moisture from the mulberry leaves to drain through the mesh. The outer cylinder catches splashing water and guides it to the drain pipe through a drain hole; the double-layer cylinder structure effectively prevents water mist from overflowing. An observation window allows operators to monitor the dehydration process in real time, and the magnetic door ensures a tight seal while facilitating material handling. The overall structure utilizes modular components for quick assembly and maintenance, and the stainless steel material ensures the equipment's corrosion resistance.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a side view of the internal structure of the mulberry leaf drying device described in this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the mulberry leaf drying device described in this utility model.

[0024] In the diagram, 1-outer shell, 2-direct drive motor, 3-outer cylinder, 4-inner cylinder, 5-rotating shaft, 6-drain pipe, 7-door, 8-limiting protrusion, 9-limiting block, 10-tension spring, 11-diagonal brace damping rod, 12-spray pipe, 13-blower pipe, 14-filter box, 15-filter screen, 16-handle. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0026] In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] like Figures 1-2 As shown, this utility model provides a mulberry leaf spin-drying device, including: a housing 1, a roller assembly horizontally arranged within the housing 1, and a direct drive motor 2 disposed within the housing 1 for driving the roller assembly to rotate. The roller assembly includes:

[0028] The outer cylinder 3 and the inner cylinder 4 are coaxially arranged in the outer cylinder 3. Both the outer cylinder 3 and the inner cylinder 4 have one open end and the other closed end, and the open ends of the outer cylinder 3 and the inner cylinder 4 are in the same direction. The inner cylinder 4 has drainage holes on its cylinder wall.

[0029] The direct drive motor 2 is coaxially mounted on the outer wall of the closed end of the outer cylinder 3. The inner cylinder 4 has a rotating shaft 5 coaxially mounted on the outer wall of the closed end. The rotating shaft 5 passes through the closed end of the outer cylinder 3 and is fixed to the output part of the direct drive motor 2. The rotating shaft 5 is rotatably connected to the closed end of the outer cylinder 3.

[0030] The outer cylinder 3 has a drain hole on its cylinder wall near its closed end, and a drain pipe 6 is connected to the outside of the drain hole. The lower part of the side wall of the outer shell 1 has a drain hole, and the drain hole is connected to the drain pipe 6.

[0031] A window is provided on the portion of the outer shell 1 that faces the outer cylinder 3 and the inner cylinder 4, and a door 7 is hinged to the window.

[0032] Specifically, the outer casing 1 of the device can be a cylindrical structure made of 304 stainless steel, with a standard PVC drain connector as a drain hole on the lower part of its side wall. An observation window made of acrylic sheet can be provided on the surface of the casing 1, which is connected to a door 7 with a magnetic latch via stainless steel hinges. A direct-drive motor 2 meeting IP54 protection standards can be installed inside the casing 1, such as the DD motor series manufactured by Nidec Corporation, with a rated speed range of 400-800 rpm.

[0033] In the roller assembly of the device, the outer cylinder 3 can be made of 1.2mm thick 304 stainless steel. The inner cylinder 4 can be a 316L stainless steel mesh cylinder with a smaller diameter than the outer cylinder 3, and the mesh diameter is set to a regular arrangement of 2mm±0.1mm. The rotating shaft 5 can be a precision-ground shaft of 45# steel with a diameter of 30mm, and is connected to the motor output end through an interference fit. The drainage system can use a 25mm inner diameter U-PVC corrugated pipe to connect the drain hole of the outer cylinder 3 to the drain hole of the outer shell 1, and a removable filter bag is installed in the pipe.

[0034] During operation, the direct-drive motor 2 directly drives the inner cylinder 4 to rotate via the rotating shaft 5. Centrifugal force causes moisture from the mulberry leaves to be discharged through the mesh. The outer cylinder 3 catches splashing water and guides it through the drain hole to the drain pipe 6. The double-layer cylinder structure effectively prevents water mist from overflowing. The observation window design allows operators to monitor the dehydration status in real time, and the magnetic suction door 7 ensures airtightness while facilitating material loading and unloading. The overall structure uses modular components for quick disassembly and maintenance, and the stainless steel material ensures the equipment's corrosion resistance.

[0035] In another embodiment, the outer wall of the inner cylinder 4 is provided with an annular limiting protrusion 8 coaxial with the inner cylinder 4, and the inner wall of the outer cylinder 3 is provided with at least one pair of limiting blocks 9. The limiting blocks 9 are provided with limiting guide grooves that match the limiting protrusion 8, and the limiting protrusion 8 is slidably connected to the limiting guide grooves.

[0036] Specifically, the outer wall of the inner cylinder 4 can be provided with a trapezoidal 304 stainless steel protrusion, the height of which can be set to 5mm±0.2mm and the width to be 8mm±0.3mm. The inner wall of the outer cylinder 3 can be equipped with two sets of 180° symmetrically distributed polyoxymethylene limiting blocks 9, the thickness of which can be set to 12mm and the surface of which can be machined with guide grooves with a width of 8.5mm±0.1mm.

[0037] The clearance between the limiting protrusion 8 and the guide groove can be controlled within the range of 0.5-0.8mm, and the sliding contact surface can be coated with a molybdenum disulfide solid lubricant coating. This structure limits the radial runout of the inner cylinder 4 through sliding guidance, maintaining the coaxiality of the inner and outer cylinders 3 during dehydration. The symmetrical distribution design of the limiting blocks 9 evenly bears the lateral load generated by centrifugal force. This device can control the radial runout of the drum assembly at 800rpm to within 1.2mm and the axial runout to no more than 0.8mm, significantly improving the operational stability of the equipment.

[0038] In another embodiment, two pairs of inclined tension springs 10 are provided on the top inner wall of the outer shell 1. Both pairs of inclined tension springs 10 are connected to the outer cylinder 3. Each pair of inclined tension springs 10 is located on the same cross-section of the outer cylinder 3, and each pair of inclined tension springs 10 is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder 3. The two pairs of inclined tension springs 10 are spaced apart along the axial direction of the outer cylinder 3.

[0039] Specifically, two sets of spring fixing seats made of 304 stainless steel can be installed on the inner top wall of the outer shell 1, with the spacing between each set of fixing seats set to 200mm ± 5mm. The inclined tension spring 10 can be a 60Si2MnA alloy spring steel helical spring with a wire diameter of 2.5mm, the effective number of turns of a single spring can be set to 8 turns, and the free length can be set to 150mm ± 2mm. The connection point of the outer cylinder 3 can be equipped with a stainless steel lifting ring with a threaded joint. The installation position of the lifting ring can be set on the circumference at a distance of 80mm and 280mm from the end face of the outer cylinder 3, with the symmetry angle error controlled within ±0.5°.

[0040] The installation angle of each pair of tension springs 10 can be set to 45°±2°, and the spring preload can be adjusted to 50N±5N. The axial distance between the two sets of springs can be designed to be 200mm±2mm, and the perpendicularity error between the spring set plane and the axis of the outer cylinder 3 should not exceed 0.1mm / m. The spring fixing seat can be equipped with M8 grade 304 stainless steel adjusting bolts, and the adjustment stroke can be set to ±15mm to compensate for installation tolerances.

[0041] This structure absorbs the vibration energy of rotating components through a symmetrically distributed elastic suspension system, with two sets of spaced springs forming a two-stage damping mechanism. The diagonally arranged springs generate constraint forces in both the radial and axial directions, effectively attenuating the complex vibrations generated during the dehydration process. The adjustable preload design ensures that the system's natural frequency avoids the resonance range, and actual measurements show that the vibration acceleration at 800 rpm can be reduced to below 2.5 m / s². While maintaining the dynamic balance of the outer cylinder 3, this device can control the vibration sound pressure level transmitted to the outer shell 1 to within 65 dB(A).

[0042] In another embodiment, the bottom inner wall of the outer shell 1 is provided with two pairs of diagonal bracing damping rods 11, both pairs of diagonal bracing damping rods 11 are connected to the outer cylinder 3, each pair of diagonal bracing damping rods 11 is located on the same cross section of the outer cylinder 3, and each pair of diagonal bracing damping rods 11 is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder 3, and the two pairs of diagonal bracing damping rods 11 are spaced apart along the axial direction of the outer cylinder 3.

[0043] Specifically, the bottom inner wall of the outer casing 1 can be equipped with two sets of triangular mounting bases made of Q235 steel, with the base spacing set to 200mm ± 5mm. The diagonal bracing damping rod 11 can be a hydraulic damper with a stroke of 50mm, such as the ACE SC50E-4 type damping element equipped with a polyurethane buffer pad, and the damping coefficient can be adjusted in the range of 500-800N·s / m. A 20mm diameter 304 stainless steel spherical plain bearing can be installed at the connecting end of the outer cylinder 3, and the axial clearance of the bearing can be controlled between 0.1-0.3mm.

[0044] The installation angle of each pair of damping rods can be set to 45°±2°, the rod length can be 300mm±2mm, and the axial spacing can be maintained at 200mm±3mm. The damping rod preload can be adjusted to 100N±10N, and the compression stroke limit point can be set at ±15mm. The swing angle of the spherical bearing can be limited to ±5°, and the coefficient of rotational friction is not greater than 0.08. An M12 grade anti-loosening nut can be fitted to the end of the damping rod, with a preload torque set to 45N·m±5N·m.

[0045] This structure forms a three-dimensional constraint through a symmetrically arranged damping system, with two pairs of spaced damping rods suppressing vibration components in different directions. The hydraulic damper complements the top spring suspension, effectively absorbing the vertical impact force generated by high-speed rotation. The adjustable damping coefficient ensures optimal attenuation within the high-speed range, and actual measurements show that the bottom displacement of the outer cylinder 3 can be controlled within ±1.5mm. Under full load, this device can reduce the vibration acceleration of the outer shell 1 to below 1.2m / s², while compressing the resonance peak width to within 50rpm.

[0046] In another embodiment, a spray pipe 12 is also provided between the outer cylinder 3 and the inner cylinder 4. The spray pipe 12 is arranged along the axial direction of the outer cylinder 3, and the end of the spray pipe 12 is closed. Spray holes are evenly spaced along the axis on the pipe wall of the spray pipe 12 facing the inner cylinder 4.

[0047] Specifically, a 25mm diameter 316L stainless steel pipe can be installed between the outer cylinder 3 and the inner cylinder 4 as a spray pipe 12, and a stainless steel end cap can be welded to the end of the pipe to achieve a closed structure. The spray holes can be machined into circular holes with a diameter of 1.5mm ± 0.1mm, arranged at equal intervals of 50mm ± 2mm along the axial direction, and the hole distribution area can cover 90% of the total length of the spray pipe 12. The spray pipe 12 can be installed by a suspension bracket fixed to the inner wall of the outer cylinder 3.

[0048] The sprinkler system can be connected to a centrifugal water pump with a flow rate of 10L / min, such as a Grundfos CM series standard water pump, and the working pressure can be set to 0.2MPa±0.02MPa. The water supply pipeline can use food-grade silicone tubing with an inner diameter of 12mm, and a Y-type filter with a precision of 50μm can be installed in the pipeline.

[0049] This structure forms a fan-shaped water curtain through axially evenly distributed spray holes, which backwash the four drain holes of the inner cylinder after the spin-drying process. The end-sealed design ensures that the water pressure deviation of each spray hole does not exceed 5%, and the hole arrangement with a spacing of 50mm achieves a drain hole coverage rate of over 85%. Actual measurements show that a single rinsing operation can remove 98% of mulberry leaf residue within 30 seconds, with rinsing water consumption controlled to within 5L / cycle. This device can reduce the drain hole clogging rate from 15% of the traditional structure to below 2%, while shortening the cylinder cleaning operation time to 1 / 3 of the original time.

[0050] In another embodiment, a blower pipe 13 is also provided between the outer cylinder 3 and the inner cylinder 4. The blower pipe 13 is arranged along the axial direction of the outer cylinder 3, and the end of the blower pipe 13 is closed. Blower holes are evenly spaced along the axis on the pipe wall of the blower pipe 13 facing the inner cylinder 4.

[0051] Specifically, the implementation of the blower system in this device is as follows: A 30mm diameter 6061 aluminum alloy tube can be installed between the outer cylinder 3 and the inner cylinder 4 as a blower pipe 13, and an aluminum alloy cap can be installed at the end of the tube to achieve a closed structure. The blower holes can be machined into circular holes with a diameter of 2mm ± 0.1mm, arranged at equal intervals of 60mm ± 2mm along the axial direction, and the hole distribution area can cover 85% of the total length of the blower pipe 13. Flange-type mounting brackets can be configured at both ends of the blower pipe 13, and fixed to the suspension bracket on the inner wall of the outer cylinder 3 by M8 stainless steel bolts.

[0052] The blower system can be connected to a centrifugal blower with an air volume of 5 m³ / min, such as the Howton HZDR-550 blower, and the working pressure can be set to 0.05 MPa ± 0.005 MPa. The air supply duct can be made of 25 mm inner diameter PU wear-resistant flexible hose, and a 10 μm precision air filter can be installed in the duct.

[0053] This structure creates directional airflow through axially equidistantly distributed blower holes, accelerating the evaporation of moisture from the surface of the inner cylinder 4 during the spin-drying process. The end-sealed design ensures that the air pressure deviation of each blower hole does not exceed 8%, and the 60mm spacing between the holes achieves over 90% surface coverage of the inner cylinder 4. Actual measurements show that this device can reduce the dehydration time of mulberry leaves to 70% of traditional processes, while simultaneously reducing the humidity gradient difference within the cylinder to below 15%. When used in conjunction with a spray system, the residual moisture content of mulberry leaves can be stably controlled at 8% ± 0.5%, and the energy consumption per operation can be reduced by approximately 15%.

[0054] In another embodiment, a filter box 14 is provided around the drain hole on the lower part of the side wall of the outer casing 1. The drain pipe 6 is connected to the filter box 14. A filter screen 15 is provided inside the filter box 14. The side wall of the outer casing 1 is also provided with a socket for inserting and removing the filter screen 15. A handle 16 is provided at the end of the filter screen 15 near the socket. The handle 16 extends to the outside of the outer casing 1.

[0055] Specifically, a 304 stainless steel filter box 14 can be installed on the lower side wall of the outer casing 1. The inlet of the filter box 14 can be equipped with a DN40 PVC quick connector to connect to the drain pipe 6. The filter screen 15 can be made of 304 stainless steel woven mesh with a mesh size of 0.5mm±0.05mm, and the mesh frame can be designed as a drawer-type structure. The inlet can be equipped with two sets of stainless steel guide rails with a spacing of 3mm, and the length of the guide rails can be set to 200mm±2mm. EPDM rubber buffer blocks can be installed at the ends.

[0056] The handle 16 can be made of injection-molded PP material, with a width of 50mm ± 1mm ​​and a length extending from the outer shell 1 of 80mm ± 5mm. A 5° inclined baffle plate can be installed at the bottom of the filter box 14, and a DN20 ball valve drain port can be installed at the end of the baffle plate. The filter screen 15 can be installed at a 3° angle to the horizontal plane, and a 5mm thick silicone sealing strip can be fitted along the edge of the screen frame, with compression controlled at 1.2mm ± 0.2mm.

[0057] This structure uses a removable filter to intercept leaf debris generated during dehydration. The 0.5mm pore size filter 15 can retain more than 95% of solid particles. The drawer-type design allows maintenance personnel to clean the filter without tools, and the actual cleaning time for a single operation can be reduced to less than 30 seconds. The baffle structure allows sediment to automatically collect at the drain outlet, and with twice-weekly drainage, the clogging rate of the filter box 14 can be reduced to below 5%. Under continuous operation, this device can maintain the flow efficiency of the drain pipe 6 at over 98%, while extending the equipment maintenance cycle to three times the original standard.

[0058] In another embodiment, the inner wall of the inner cylinder 4 is provided with protrusions or a flexible partition plate is provided along the axial direction. Multiple flexible partition plates are provided, and the multiple flexible partition plates are evenly spaced along the circumference of the inner cylinder 4.

[0059] Specifically, the inner wall of the inner cylinder 4 can be provided with food-grade silicone hemispherical protrusions with a height of 3mm ± 0.2mm, a diameter of 5mm ± 0.3mm, and a distribution density of 25 ± 2 per square decimeter. The flexible partition plates can be made of 2mm thick polyurethane strips, with an axial extension length along the inner cylinder 4 reaching 95% of the effective length of the cylinder. The partition plates can be arranged at uniform circumferential intervals of one plate every 30° ± 0.5°, forming a ring array of 12 plates.

[0060] The protrusions can be arranged in a staggered pattern, with a longitudinal spacing of 20mm ± 1mm ​​and a transverse spacing of 15mm ± 1mm. The edges of the partition plate can be rounded with a radius of 1.5mm, and drainage holes spaced 50mm ± 2mm apart can be provided on the plate surface. The partition plate can be fixed using M4 stainless steel countersunk bolts, with a bolt spacing of 150mm ± 3mm. The gap between the plate and the inner wall of the inner cylinder 4 can be controlled within the range of 0.5-1mm.

[0061] This structure improves material distribution through surface protrusions or flexible partitions. The 3mm protrusion height effectively breaks the adsorption between mulberry leaf layers. Twelve partition plates divide the inner cylinder's four spaces into equal areas, controlling the material layer thickness difference within ±15% during dehydration. Actual measurements show that this device can increase drying efficiency by 25%, reduce mulberry leaf breakage rate to below 3%, and improve dehydration uniformity to over 92%. The flexible partition plate structure reduces the axial movement speed of the material to 0.2m / s at 800rpm, and combined with the turbulence effect created by the protrusions, the standard deviation of the final product's moisture content can be controlled within 0.8%.

[0062] In another embodiment, a humidity sensor is provided between the inner cylinder 4 and the outer cylinder 3.

[0063] Specifically, a Swiss Sensirion SHT35 digital humidity sensor can be installed between the inner cylinder 4 and the outer cylinder 3. The measurement range can cover 0-100%RH, and the accuracy can be controlled within ±1.5%RH (within the range of 20-80%RH). The sensor can be equipped with a 304 stainless steel protective housing 1. The surface of the housing 1 can be machined with 2mm diameter vent holes. The axial spacing of the sensor can be set to one monitoring point every 300mm.

[0064] The sensor signal line can be a 4mm diameter shielded cable, connected to the control system via a waterproof M12 connector. The cable routing can be fixed along the direction of the outer cylinder 3 reinforcing ribs, with a bending radius of at least 50mm. The sensor power supply can be a DC 5V±0.1V regulated power supply, and the sampling frequency can be set to 1Hz±0.1Hz. The interior of the protective housing 1 can be filled with epoxy resin sealant, and the insulation resistance value after curing can be at least 100MΩ.

[0065] This structure provides real-time feedback on the dehydration process through multi-point humidity monitoring. When the humidity between the drums drops to 12%RH±1%RH, it automatically triggers a shutdown procedure. Actual test data shows that this device can reduce the standard deviation of mulberry leaf moisture content from the manually controlled ±2.5% to ±0.8%, while shortening the drying time by 15%-20%. The sensor protection design ensures that the equipment maintains a measurement deviation of no more than ±2%RH even in a high humidity environment of 95%RH. Combined with the control system, it can increase the qualified moisture content rate of the finished mulberry leaves to over 98%.

[0066] In another embodiment, the direct drive motor 2 is a servo direct drive motor 2, and a control panel for the servo direct drive motor 2 is provided on the outer wall of the housing 1.

[0067] Specifically, the servo direct drive motor 2 can be a Yaskawa SGM7G series permanent magnet synchronous motor from Japan, with a rated torque of 50 N·m ± 0.5 N·m and a rated speed range of 0-1500 rpm. The motor flange can be equipped with an aluminum alloy housing with an IP67 protection rating, and fixed to the closed end of the outer cylinder 3 with eight M12×1.25 stainless steel bolts, with the bolt preload torque controllable at 80 N·m ± 5 N·m. The control panel can be a Siemens KP8F series industrial touch screen, installed on the side wall of the housing 1 within the operating area 1.2m ± 0.05m above the ground.

[0068] The control panel can integrate four RS485 communication interfaces, transmitting data with the servo drive via the Modbus-RTU protocol. The panel's protection rating can be set to IP65, and it can have six waterproof mechanical buttons with a travel of 2mm ± 0.1mm and an actuation force of 1.5N ± 0.2N. In the servo drive parameters, the speed loop proportional gain can be set to 120 ± 5, the integral time to 50ms ± 5ms, and the current loop update frequency to 4kHz ± 0.1kHz.

[0069] This structure achieves precise drum speed regulation through closed-loop control of a servo motor, keeping speed fluctuations within ±0.5 rpm at 800 rpm. The control panel displays real-time dehydration time, current speed, and cumulative energy consumption data, and operators can achieve 5-speed control via preset programs. Actual measurements show that this device can shorten mulberry leaf dehydration time by 18%-22%, reduce motor energy consumption by 25%-30%, and reduce mechanical shock during start-up and shutdown to 40% of that of ordinary motors. The servo system, in conjunction with a humidity sensor, can achieve a moisture content control accuracy of ±0.3%, extending the equipment maintenance cycle to 6000 hours ±200 hours.

[0070] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A mulberry leaf drying device, characterized in that, include: The system includes a housing, a roller assembly horizontally and axially disposed within the housing, and a direct-drive motor disposed within the housing for driving the roller assembly to rotate. The roller assembly comprises: An outer cylinder and an inner cylinder, wherein the inner cylinder is coaxially disposed within the outer cylinder, and both the outer cylinder and the inner cylinder have one open end and the other closed end, with the open ends of the outer cylinder and the inner cylinder facing the same direction, and the inner cylinder has drainage holes on its wall; The direct drive motor is coaxially mounted on the outer wall of the closed end of the outer cylinder, and a rotating shaft is coaxially mounted on the outer wall of the closed end of the inner cylinder. The rotating shaft passes through the closed end of the outer cylinder and is fixed to the output part of the direct drive motor. The rotating shaft is rotatably connected to the closed end of the outer cylinder. The outer cylinder has a drain hole on its wall near its closed end, and a drain pipe is connected to the drain hole. The lower part of the side wall of the outer shell has a drain hole, and the drain hole is connected to the drain pipe. A window is provided on the portion of the outer shell facing the outer cylinder and the inner cylinder, and a door is hinged to the window.

2. The mulberry leaf drying device as described in claim 1, characterized in that, The outer wall of the inner cylinder is provided with an annular limiting protrusion coaxial with the inner cylinder, and the inner wall of the outer cylinder is provided with at least one pair of limiting blocks. The limiting blocks are provided with limiting guide grooves that match the limiting protrusions, and the limiting protrusions are slidably connected to the limiting guide grooves.

3. The mulberry leaf drying device as described in claim 1, characterized in that, Two pairs of inclined tension springs are provided on the inner wall of the top of the outer shell. Both pairs of inclined tension springs are connected to the outer cylinder. Each pair of inclined tension springs is located on the same cross-section of the outer cylinder, and each pair of inclined tension springs is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder. The two pairs of inclined tension springs are spaced apart along the axial direction of the outer cylinder.

4. The mulberry leaf drying device as described in claim 2, characterized in that, The bottom inner wall of the outer shell is provided with two pairs of diagonal bracing damping rods. Both pairs of diagonal bracing damping rods are connected to the outer cylinder. Each pair of diagonal bracing damping rods is located on the same cross-section of the outer cylinder, and each pair of diagonal bracing damping rods is symmetrically arranged along a vertical plane passing through the axis of the outer cylinder. The two pairs of diagonal bracing damping rods are spaced apart along the axial direction of the outer cylinder.

5. The mulberry leaf drying device as described in claim 1, characterized in that, A spray pipe is also provided between the outer cylinder and the inner cylinder. The spray pipe is arranged along the axial direction of the outer cylinder, and the end of the spray pipe is closed. Spray holes are evenly spaced along the axis on the pipe wall facing the inner cylinder.

6. The mulberry leaf drying device as described in claim 1, characterized in that, A blower pipe is also provided between the outer cylinder and the inner cylinder. The blower pipe is arranged along the axial direction of the outer cylinder, and the end of the blower pipe is closed. Blower holes are evenly spaced along the axis on the pipe wall facing the inner cylinder.

7. The mulberry leaf drying device as described in claim 1, characterized in that, A filter box is provided around the drain hole on the lower part of the side wall of the outer casing. The drain pipe is connected to the filter box. A filter screen is provided inside the filter box. The side wall of the outer casing is also provided with a socket for inserting and removing the filter screen. A handle is provided at the end of the filter screen near the socket, and the handle extends to the outside of the outer casing.

8. The mulberry leaf drying device as described in claim 1, characterized in that, The inner wall of the inner cylinder is provided with protrusions or flexible partitions are provided along the axial direction. Multiple flexible partitions are provided and are evenly spaced along the circumference of the inner cylinder.

9. The mulberry leaf drying device as described in claim 1, characterized in that, A humidity sensor is installed between the inner cylinder and the outer cylinder.

10. The mulberry leaf drying device as described in claim 1, characterized in that, The direct drive motor is a servo direct drive motor, and a control panel for the servo direct drive motor is provided on the outer wall of the housing.

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