Multi-section mesh belt heat pump drying device and energy-saving control method

Abstract

The present application belongs to the technical field of heat pump drying equipment, and particularly relates to a multi-section type net belt heat pump drying device and an energy-saving control method. The multi-section type net belt heat pump drying device comprises a conveying belt and a drying box body. A feeding chute is arranged on the top of the drying box body and close to one side of the conveying belt. A discharging chute is arranged on the bottom of the drying box body and away from the other side of the conveying belt. A plurality of drying conveying belts are arranged in the drying box body from top to bottom, and the drying conveying belts are arranged at left or right positions in a spaced manner. A through groove is uniformly arranged on the belt body of the drying conveying belt. A plurality of partition plates are uniformly fixed on the outside of the belt body. The present application does not need to additionally configure an independent driving unit, and can reduce the energy consumption and structural complexity of the equipment. The multi-layered and folded drying conveying belt cooperates with the shaking of the net mat to turn the surface layer and the internal materials, so that the materials are heated more uniformly, the consistency of drying is improved, and the shaking amplitude of the supporting elastic net mat is changed to adapt to materials with different moisture contents.

Description

Technical Field

[0001] This invention belongs to the technical field of heat pump drying equipment, specifically relating to a multi-section mesh belt heat pump drying device and an energy-saving control method. Background Technology

[0002] Mesh belt heat pump dryers are widely used in the dehydration processing of agricultural products, food and industrial materials because they can achieve continuous drying operations. Existing multi-stage mesh belt dryers mostly adopt multi-layer folding mesh belt structures to improve the drying effect by extending the residence time of materials in the drying chamber, but there are some shortcomings in actual use. The material is laid flat on the surface of the mesh belt and is in a relatively static state. The surface material dries quickly, but the moisture in the material accumulated inside is difficult to be released quickly, resulting in insufficient drying uniformity and uneven drying. It is necessary to extend the drying time to ensure that the overall moisture content meets the standard, which increases energy consumption. In addition, some equipment with added turning or vibration mechanisms are equipped with independent drive units, which not only increases the complexity of the equipment structure and manufacturing cost, but also further increases the operating energy consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-segment mesh belt heat pump drying device and energy-saving control method, which does not require additional independent drive unit, can reduce equipment operating energy consumption and structural complexity. The multi-layer folding drying conveyor belt, combined with the shaking of the mesh pad, can turn the surface and internal materials, making the materials heat more evenly, improving the consistency of drying, and changing the shaking amplitude of the supporting elastic mesh pad to adapt to materials with different moisture contents.

[0004] The specific technical solution adopted by this invention is as follows: A multi-segment mesh belt heat pump drying device includes a conveyor belt and a drying chamber. A feed chute is provided on the top of the drying chamber and on the side close to the conveyor belt, and a discharge chute is provided on the bottom of the drying chamber and on the side away from the conveyor belt. The drying chamber is equipped with multiple drying conveyor belts arranged from top to bottom inside, and these belts are spaced apart on the left or right. The belts have uniformly spaced grooves, and multiple partitions are uniformly fixed on the outer side of each belt. A supporting elastic mesh pad is fixed between every two partitions. An abutment structure is installed inside each drying conveyor belt and at the bottom of each supporting elastic mesh pad. The abutment structure is used to push the supporting elastic mesh pad to shake.

[0005] The abutment structure includes a rotating roller rotatably connected inside the belt body. The top of the rotating roller is located at the top of the belt body and at the bottom of the supporting elastic mesh pad. A rotating plate is fixed to the top of the rotating roller. Multiple abutment blocks are evenly arranged on the top of the rotating plate. A fixing plate is fixed to the outside of the rotating roller and inside the belt body. A rotating rod is rotatably connected to the top of the fixing plate and at one end away from the rotating roller. A driving structure is installed between the rotating rod and the drying chamber. The driving structure is used to drive the rotating plate to swing back and forth.

[0006] The driving structure includes a meshing gear fixed to the top of the rotating rod. A plurality of first racks are fixed to the inner wall of the drying chamber, and a notch is provided between every two first racks. A limit rod is fixed to the top of the fixed plate, and the top of the limit rod is fixedly connected to the inner wall of the drying conveyor belt. A synchronous transmission structure is installed between the rotating rod and the rotating roller, and the synchronous transmission structure is used to drive the rotating rod and the rotating plate to rotate synchronously.

[0007] The synchronous transmission structure includes two transmission shafts, which are respectively fixed to the outside of the rotating roller and the rotating rod. The two transmission shafts are connected by a transmission belt. A reset structure is provided between the rotating roller and the fixed plate. When the meshing gear is in the notch position, the reset structure is used to drive the rotating roller to reset.

[0008] The reset structure includes a torsion spring, which is installed between the fixed plate and the rotating roller. One end of the torsion spring is connected to the rotating roller, and the other end of the torsion spring is connected to the fixed plate.

[0009] A bottom abutment piece is installed inside the drying chamber and inside the drying conveyor belt. The bottom abutment piece is inclined downward from right to left. The bottom of the rotating roller passes through the fixed plate and extends to the bottom of the fixed plate. The bottom of the rotating roller abuts against the bottom abutment piece. A rotating column is rotatably connected to the right end of the bottom abutment piece. An inclined plate is rotatably connected to the side of the rotating column away from the bottom abutment piece. The inclined plate is inclined upward towards the end of the bottom abutment piece. A protrusion is fixed to the end of the bottom abutment piece away from the rotating column. An adjustment structure is installed on the side of the protrusion away from the bottom abutment piece. The adjustment structure is used to adjust the tilt angle of the bottom abutment piece.

[0010] The adjustment structure includes a second rack, which is located on the side of the protrusion away from the bottom abutment piece. A rotating bar is rotatably connected inside the drying chamber and on one side of the second rack. A rack gear is fixed to the outside of the rotating bar and meshes with the second rack. A stepper motor is installed on the outside of the drying chamber. The output end of the stepper motor passes through the drying chamber and extends into the interior of the drying chamber, connecting with the rotating bar. An adapter structure is installed between the drive shaft and the fixed plate. The adapter structure ensures that the drive shaft remains in the same position when the rotating roller moves up and down.

[0011] The adapter structure includes a groove disposed on the outside of the rotating roller. A slider is disposed inside the drive shaft and extends into the groove and is slidably connected to the rotating roller. A rotating annular bar is fixed at the bottom of the drive shaft and is rotatably connected to the fixed plate.

[0012] The bottom abutment piece has multiple water guide grooves on its top, and these grooves are inclined toward the end closest to the protrusion.

[0013] An energy-saving control method for a multi-stage mesh belt heat pump drying device, the energy-saving control method being used to save energy in the aforementioned multi-stage mesh belt heat pump drying device, the energy-saving control method comprising: S1: Based on the type of material to be dried, the initial moisture content and the target moisture content, set the initial operating parameters of the system, start the device, and the material enters the drying chamber through the feeding trough and is conveyed and dried sequentially by the multi-layer drying conveyor belt; S2: Real-time detection of the moisture content of materials on each layer of the drying conveyor belt; adjustment of the tilt angle of the bottom contact plate of the corresponding layer based on the moisture content detection results; change of the swaying amplitude of the supporting elastic mesh pad. S3: Based on the moisture content of the materials in each layer, simultaneously adjust the conveying speed of the drying conveyor belt in each layer and the operating power of the heat pump drying system. S4: Real-time detection of the final moisture content of the material at the discharge end, forming a closed-loop verification to maintain steady-state energy-saving operation; the device automatically enters standby energy-saving state when there is no feeding.

[0014] The technical effects achieved by this invention are as follows: This invention utilizes the movement of the drying conveyor belt itself, combined with the meshing transmission of the first rack and meshing gear, to drive the contact structure and cause the supporting elastic mesh pad to sway. This eliminates the need for an additional independent drive unit, reducing equipment energy consumption and structural complexity. The multi-layered, folding drying conveyor belt, combined with the swaying of the mesh pad, can agitate the surface and internal materials, resulting in more uniform heating and improved drying consistency. Furthermore, the adjustable tilt angle of the bottom contact plate allows for adjustment of the lifting height of the rotating roller, thereby altering the swaying amplitude of the supporting elastic mesh pad to accommodate materials with different moisture contents. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the drying chamber in this invention; Figure 3 This is a schematic diagram of the structure between the supporting elastic mesh pad, the belt, and the bottom abutment piece in this invention; Figure 4 This is a schematic diagram of the structure between the water guide channel, the bottom abutment piece, and the rotating plate in this invention; Figure 5 This is a schematic diagram of the structure between the first toothed rack, the bottom abutment piece, and the belt body in this invention; Figure 6 This is a schematic diagram of the structure between the abutment block, the meshing gear, and the rotating roller in this invention; Figure 7 In this invention Figure 5 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the structure between the rotating roller, the fixed plate, and the torsion spring in this invention; Figure 9 This is a schematic diagram of the structure between the drive shaft, the slide groove, and the rotating roller in this invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Conveyor belt; 2. Drying chamber; 3. Feed chute; 4. Discharge chute; 5. Drying conveyor belt; 6. Through groove; 7. Partition plate; 8. Supporting elastic mesh pad; 9. Groove; 10. First rack; 11. Notch; 12. Rotating roller; 13. Rotating ring bar; 14. Rotating plate; 15. Abutting block; 16. Rotating rod; 17. Meshing gear; 18. Drive shaft; 19. Drive belt; 20. Limiting rod; 21. Bottom abutting piece; 22. Rotating column; 23. Inclined piece; 24. Water guide groove; 25. Protrusion; 26. Rotating bar; 27. Bar gear; 28. Second rack; 29. ​​Belt body; 30. Fixing plate; 31. Torsion spring; 32. Slide groove; 33. Slider; 34. Stepper motor. Detailed Implementation

[0017] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention. Example

[0018] See appendix Figures 1-9 A multi-section mesh belt heat pump drying device includes a conveyor belt 1 and a drying chamber 2. The drying chamber 2 is a closed drying cavity, and the heat exchange, air supply, and return air components of the heat pump drying system are installed inside. This part is a conventional technical means in the art and will not be described in detail here. A feeding chute 3 is provided at the top of the drying chamber 2 and on the side close to the conveyor belt 1 for continuously conveying the material to be dried into the feeding chute 3; a discharge chute 4 is provided at the bottom of the drying chamber 2 and on the side away from the conveyor belt 1 for discharging the material that has completed the drying process. The drying chamber 2 has multiple drying conveyor belts 5 arranged from top to bottom inside. These conveyor belts 5 are driven by a drive structure such as a motor, and are spaced apart on the left or right, forming a stepped, zigzag material conveying path. The discharge end of the upper drying conveyor belt 5 corresponds to the feed end of the lower drying conveyor belt 5, and the material passes through each layer of drying conveyor belts 5 sequentially to complete multiple stages of continuous drying. The drying conveyor belt 5 includes a belt body 29, on which several through slots 6 are evenly opened. The through slots 6 allow drying air to pass through, improving the drying efficiency at the bottom of the material. Several partitions 7 are evenly fixed on the outer side of the belt body 29, and a supporting elastic mesh pad 8 is fixed between every two partitions 7. The top of the supporting elastic mesh pad 8 is provided with a groove 9, which can temporarily support the material and reduce the material from spilling from the side during shaking. Inside the drying conveyor belt 5, at the bottom of each supporting elastic mesh pad 8, an abutment structure is installed to push the supporting elastic mesh pad 8 to shake.

[0019] See appendix Figures 4-6 The abutment structure includes a rotating roller 12, which is rotatably connected inside the belt body 29. The top of the rotating roller 12 is located at the top of the belt body 29 and at the bottom of the supporting elastic mesh pad 8. A rotating plate 14 is fixed to the top of the rotating roller 12. A plurality of abutment blocks 15 are evenly arranged on the top of the rotating plate 14. The top of the abutment blocks 15 can contact the bottom surface of the supporting elastic mesh pad 8. A fixing plate 30 is fixed to the outside of the rotating roller 12 and inside the belt body 29. A rotating rod 16 is rotatably connected to the top of the fixing plate 30 and at one end away from the rotating roller 12. A drive structure is installed between the rotating rod 16 and the drying chamber 2. The drive structure is used to drive the rotating plate 14 to swing back and forth.

[0020] See appendix Figure 6The drive structure includes a meshing gear 17, which is fixed to the top of the rotating rod 16. Multiple first racks 10 are fixed to the inner wall of the drying chamber 2. The first racks 10 are arranged along the conveying direction of the drying conveyor belt 5, and a notch 11 is provided between every two first racks 10. A limit rod 20 is fixed to the top of the fixed plate 30. The limit rod 20 is used to limit the position of the fixed plate 30 to prevent the fixed plate 30 from deflecting with the rotating roller 12 and to ensure the meshing accuracy between the meshing gear 17 and the first racks 10. The top of the limit rod 20 is fixedly connected to the inner wall of the drying conveyor belt 5. A synchronous transmission structure is installed between the rotating rod 16 and the rotating roller 12. The synchronous transmission structure is used to drive the rotating rod 16 and the rotating plate 14 to rotate synchronously.

[0021] The synchronous transmission structure includes two transmission shafts 18, which are fixed to the outer sides of the rotating roller 12 and the rotating rod 16, respectively. The two transmission shafts 18 are connected by a transmission belt 19. When the rotating rod 16 drives the meshing gear 17 to rotate, the transmission shafts 18 and the transmission belt 19 drive the rotating roller 12 to rotate synchronously. This causes the rotating plate 14 and the abutment block 15 to rotate together with the rotating roller 12, creating an intermittent pushing effect on the supporting elastic mesh pad 8. The belt drive structure composed of the transmission shafts 18 and the transmission belt 19 can be replaced with a chain drive structure composed of sprockets and chains to improve transmission stability and load-bearing capacity, adapting to heavy-load drying conditions. A reset structure is provided between the rotating roller 12 and the fixed plate 30. When the meshing gear 17 moves to the notch 11 position and disengages from the first rack 10, the reset structure drives the rotating roller 12 to rotate back to its original position.

[0022] See appendix Figure 8 The reset structure includes a torsion spring 31, which is installed between the fixed plate 30 and the rotating roller 12. One end of the torsion spring 31 is connected to the rotating roller 12, and the other end of the torsion spring 31 is connected to the fixed plate 30. When the meshing gear 17 meshes with the first rack 10, the rotating roller 12 rotates, causing the torsion spring 31 to undergo elastic deformation and store force. When the meshing gear 17 moves to the notch 11 and loses its meshing limit, the torsion spring 31 releases its elastic force, causing the rotating roller 12 to rotate, causing the rotating plate 14 to swing in the opposite direction, thereby achieving the effect of reciprocating swaying.

[0023] Inside the drying chamber 2 and inside the drying conveyor belt 5, a bottom abutment piece 21 is installed. The bottom abutment piece 21 is inclined downward from right to left. The bottom of the rotating roller 12 passes through the fixed plate 30 and extends to the bottom of the fixed plate 30. The bottom of the rotating roller 12 abuts against the bottom abutment piece 21. A rotating column 22 is rotatably connected to the right end of the bottom abutment piece 21. An inclined piece 23 is rotatably connected to the side of the rotating column 22 away from the bottom abutment piece 21. The inclined piece 23 is inclined upward towards the end of the bottom abutment piece 21. The inclined piece 23 can guide the rotating roller 12 to move smoothly to the surface of the bottom abutment piece 21, reducing hard impact. A protrusion 25 is fixed to the end of the bottom abutment piece 21 away from the rotating column 22. An adjustment structure is installed on the side of the protrusion 25 away from the bottom abutment piece 21. The adjustment structure is used to adjust the tilt angle of the bottom abutment piece 21, thereby changing the lifting height of the rotating roller 12 and adjusting the swaying amplitude of the supporting elastic mesh pad 8.

[0024] See appendix Figure 5 and Figure 7 The adjustment structure includes a second rack 28, which is located on the side of the protrusion 25 away from the bottom abutment piece 21. Inside the drying chamber 2 and on the side of the second rack 28, a rotating bar 26 is rotatably connected. A bar gear 27 is fixed to the outside of the rotating bar 26 and meshes with the second rack 28. A stepper motor 34 is installed on the outside of the drying chamber 2. The output end of the stepper motor 34 passes through the drying chamber 2 and extends into the interior of the drying chamber 2 to connect with the rotating bar 26. When the stepper motor 34 is started, it can drive the rotating bar 26 and the bar gear 27 to rotate. Through meshing transmission, the second rack 28 moves up and down, which in turn drives the bottom abutment piece 21 to swing around the rotating column 22 through the protrusion 25, thereby adjusting the tilt angle. An adapter structure is installed between the drive shaft 18 and the fixed plate 30. The adapter structure is used to keep the drive shaft 18 in the same position when the rotating roller 12 moves up and down.

[0025] See appendix Figure 9 The adapter structure includes a groove 32, which is located on the outside of the rotating roller 12. A slider 33 is provided inside the drive shaft 18, and the slider 33 extends into the groove 32 and is slidably connected to the rotating roller 12. A rotating annular bar 13 is fixed at the bottom of the drive shaft 18 and is rotatably connected to the fixed plate 30. When the rotating roller 12 moves up and down, the slider 33 can slide relative to the groove 32, while the drive shaft 18 remains unchanged in axial position under the limit of the rotating annular bar 13, thereby adapting to the up and down displacement of the rotating roller 12 without affecting the transmission of rotational torque.

[0026] The bottom abutment plate 21 is provided with multiple water guide grooves 24 on its top, and the multiple water guide grooves 24 are inclined towards the end near the protrusion 25. The condensate dripping from the supporting elastic mesh pad 8 and the material can fall onto the surface of the bottom abutment plate 21, flow in a direction along the water guide grooves 24, and finally collect and discharge from the drying chamber 2, reducing the situation where condensate drips onto the lower material. Example

[0027] An energy-saving control method for a multi-stage mesh belt heat pump drying device, the method being used to save energy in the aforementioned multi-stage mesh belt heat pump drying device, the energy-saving control method comprising: S1: Initial operating parameters matching and system startup. Based on the type of material to be dried, the initial moisture content and the target output moisture content, the initial operating parameters of the system are preset. The parameters include the initial conveying speed of each drying conveyor belt 5, the initial air supply temperature and circulating air volume of the heat pump drying system, and the initial output angle of the stepper motor 34, i.e., the initial tilt angle of the bottom contact plate 21. After the parameters are set, the heat pump drying system and conveyor belt 1 are started. The material to be dried is conveyed to the feed trough 3 via conveyor belt 1 and falls evenly onto the uppermost drying conveyor belt 5 inside the drying chamber 2. The device then enters continuous drying operation. At the same time, the online moisture detection units arranged at the discharge end of each drying conveyor belt 5 are activated to enter real-time monitoring mode.

[0028] S2: Real-time monitoring of layered moisture content and adaptive adjustment of vibration amplitude. During the drying process, the online moisture detection unit of each layer collects the real-time moisture content data of the material on the corresponding drying conveyor belt 5 and transmits the data to the control unit of the device. The control unit compares the collected real-time moisture content with the preset moisture content threshold of the drying stage: when the real-time moisture content of a certain layer of material is detected to be higher than the preset threshold of the corresponding stage, the control unit outputs an adjustment signal to the stepper motor 34 corresponding to that layer. The stepper motor 34 drives the rotating bar 26 and the rack gear 27 to rotate. Through the meshing transmission of the rack gear 27 and the second rack 28, the bottom abutment piece 21 is driven to swing around the rotating column 22, increasing the tilt angle of the bottom abutment piece 21, thereby raising the running height of the rotating roller 12, increasing the swaying amplitude of the supporting elastic mesh pad 8, accelerating the precipitation rate of moisture inside the material, and shortening the drying time. When the real-time moisture content of a certain layer of material is detected to be lower than the preset threshold for the corresponding stage, the control unit controls the stepper motor 34 to rotate in the opposite direction, reducing the tilt angle of the bottom abutment piece 21, reducing the swaying amplitude of the supporting elastic mesh pad 8, and reducing mechanical losses and energy consumption caused by ineffective vibration. During the adjustment process, the sliding groove 32 and the slider 33 of the adaptive structure cooperate with each other to ensure that the position of the transmission shaft 18 remains constant and maintain the stable operation of the transmission structure.

[0029] S3: Coordinated adjustment of conveying parameters for multiple drying paths. The control unit synchronously adjusts the conveying speed of each drying conveyor belt 5 based on the moisture content detection results of the material in each layer. For the upper high-moisture-content section, the conveying speed of the drying conveyor belt 5 is appropriately reduced to extend the material's residence time in that layer, combined with high-amplitude vibration and tumbling to ensure sufficient dehydration. For the lower low-moisture-content section, the conveying speed of the drying conveyor belt 5 is appropriately increased to avoid over-drying and shorten ineffective drying time. Simultaneously, the control unit synchronously adjusts the operating power and circulating air volume of the heat pump drying system according to the overall material drying progress: when the overall average moisture content of the material is high, a high heat pump operating power and circulating air volume are maintained to ensure drying capacity; when the overall average moisture content of the material gradually decreases, the heat pump operating power and circulating air volume are correspondingly reduced to reduce the energy consumption of the heat pump system while meeting drying requirements. The arrangement density of the first racks 10 corresponding to each drying conveyor belt 5 is matched with the conveying speed to ensure that the vibration frequency is adapted to the drying stage, further optimizing energy-saving effects.

[0030] S4: Closed-loop verification and steady-state energy-saving control of discharge moisture content. A discharge moisture detection unit located at discharge chute 4 monitors the final moisture content of the discharged material in real time and feeds the data back to the control unit, forming a closed-loop control. When the final moisture content is stably within the target range, the control unit maintains the current operating parameters of each system and enters a steady-state energy-saving operation mode. When the final moisture content is higher than the target value, the control unit gradually increases the vibration amplitude of each drying section, extends the material residence time, or increases the heat pump power until the discharge moisture content meets the standard. When the final moisture content is lower than the target value, the control unit gradually decreases the operating parameters to reduce energy consumption. When feeding is interrupted or there is no material on conveyor belt 1, the control unit automatically reduces the power of the heat pump system and the operating speed of the drying conveyor belt 5, entering a standby energy-saving state. After feeding resumes, it automatically returns to normal operating parameters, further reducing idle energy consumption.

[0031] Working principle: In actual operation, the material to be dried is conveyed to the feed trough 3 via conveyor belt 1 and falls onto the uppermost drying conveyor belt 5, where it is supported by the groove 9 of the elastic mesh pad 8. The drying conveyor belt 5 moves slowly along the conveying direction, driving the material to move within the drying chamber 2. When the meshing gear 17 moves with the drying conveyor belt 5 to the position where it meshes with the first rack 10, the teeth of the first rack 10 push the meshing gear 17 to rotate, which in turn drives the rotating roller 12 to rotate through the rotating rod 16 and the synchronous transmission structure. This causes the abutment block 15 at the top of the rotating plate 14 to intermittently push up the supporting elastic mesh pad 8, causing the supporting elastic mesh pad 8 to deform and shake, turning over the material on top of it. When the meshing gear 17 moves to the gap 11 between the first racks 10, the meshing gear 17 loses the tooth limit, and the torsion spring 31 drives the rotating roller 12 to rotate back to its original position, causing the rotating plate 14 to swing in the opposite direction. As the drying conveyor belt 5 continues to move, the meshing gear 17 passes through multiple sections of the first rack 10 and the notch 11 in sequence, causing the rotating plate 14 to oscillate continuously, continuously driving the material to turn over.

[0032] After the material moves to the end of the drying conveyor belt 5, it falls onto the next drying conveyor belt 5. After passing through each drying layer in sequence, it is finally discharged from the discharge chute 4. When it is necessary to adjust the material's tumbling amplitude, the stepper motor 34 is started to drive the rack gear 27 to rotate, which drives the second rack 28 to move up and down, causing the bottom abutment piece 21 to swing around the rotating column 22, changing the tilt angle of the bottom abutment piece 21, thereby adjusting the lifting height of the rotating roller 12, changing the degree of deformation of the supporting elastic mesh pad 8, and realizing the adjustment of the swaying amplitude. As another preferred embodiment, an online moisture detection unit can be installed inside the drying chamber 2 to detect the moisture content of the materials on each drying conveyor belt 5 in real time and transmit the detection signal to the control unit. The control unit automatically adjusts the output of the stepper motor 34 according to the moisture content of the materials, and adjusts the tilt angle of the bottom contact plate 21: when the moisture content of the materials is high, the tilt angle is increased to increase the shaking amplitude and accelerate water separation; when the moisture content of the materials decreases to the set value, the tilt angle is decreased to reduce the shaking amplitude, reduce material breakage and ineffective energy consumption, thereby achieving adaptive energy-saving control.

[0033] The condensate generated during the drying process drips onto the surface of the bottom contact plate 21, then flows directionally along the water guide groove 24 and is discharged, reducing the possibility of dripping onto the lower layer of material.

[0034] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A multi-segment mesh belt heat pump drying device, comprising a conveyor belt (1) and a drying chamber (2), characterized in that: A feeding trough (3) is provided on the top of the drying chamber (2) and on the side close to the conveyor belt (1), and a discharge trough (4) is provided on the bottom of the drying chamber (2) and on the side away from the conveyor belt (1). The drying chamber (2) is provided with multiple drying conveyor belts (5) arranged from top to bottom inside, and the multiple drying conveyor belts (5) are arranged at intervals on the left or right. The belt body (29) of the drying conveyor belt (5) is provided with through grooves (6). Multiple partitions (7) are fixed evenly on the outer side of the belt body (29), and a supporting elastic mesh pad (8) is fixed between every two partitions (7). An abutting structure is installed inside the drying conveyor belt (5) and at the bottom of each supporting elastic mesh pad (8). The abutting structure is used to push the supporting elastic mesh pad (8) to shake.

2. The multi-section mesh belt heat pump drying device according to claim 1, characterized in that: The abutting structure includes a rotating roller (12), which is rotatably connected inside the belt body (29). The top of the rotating roller (12) is located at the top of the belt body (29) and at the bottom of the supporting elastic mesh pad (8). A rotating plate (14) is fixed to the top of the rotating roller (12). A plurality of abutting blocks (15) are evenly arranged on the top of the rotating plate (14). A fixing plate (30) is fixed to the outside of the rotating roller (12) and inside the belt body (29). A rotating rod (16) is rotatably connected to the top of the fixing plate (30) and at one end away from the rotating roller (12). A driving structure is installed between the rotating rod (16) and the drying box (2). The driving structure is used to drive the rotating plate (14) to swing back and forth.

3. The multi-section mesh belt heat pump drying device according to claim 2, characterized in that: The driving structure includes a meshing gear (17), which is fixed to the top of the rotating rod (16). The inner wall of the drying chamber (2) is fixed with a plurality of first racks (10), and a notch (11) is provided between every two first racks (10). A limit rod (20) is fixed to the top of the fixing plate (30), and the top of the limit rod (20) is fixedly connected to the inner wall of the drying conveyor belt (5). A synchronous transmission structure is installed between the rotating rod (16) and the rotating roller (12), which is used to drive the rotating rod (16) and the rotating plate (14) to rotate synchronously.

4. The multi-section mesh belt heat pump drying device according to claim 3, characterized in that: The synchronous transmission structure includes two transmission shafts (18), which are respectively fixed to the outside of the rotating roller (12) and the rotating rod (16). The two transmission shafts (18) are driven by a transmission belt (19). A reset structure is provided between the rotating roller (12) and the fixed plate (30). When the meshing gear (17) is in the notch (11) position, the reset structure is used to drive the rotating roller (12) to reset.

5. The multi-section mesh belt heat pump drying device according to claim 4, characterized in that: The reset structure includes a torsion spring (31), which is installed between the fixed plate (30) and the rotating roller (12). One end of the torsion spring (31) is connected to the rotating roller (12), and the other end of the torsion spring (31) is connected to the fixed plate (30).

6. The multi-section mesh belt heat pump drying device according to claim 5, characterized in that: A bottom abutment piece (21) is installed inside the drying chamber (2) and inside the drying conveyor belt (5). The bottom abutment piece (21) is inclined downward from right to left. The bottom of the rotating roller (12) passes through the fixed plate (30) and extends to the bottom of the fixed plate (30). The bottom of the rotating roller (12) abuts against the bottom abutment piece (21). A rotating column (22) is rotatably connected to the right end of the bottom abutment piece (21). An inclined piece (23) is rotatably connected to the side of the rotating column (22) away from the bottom abutment piece (21). The inclined piece (23) is inclined upward towards the end of the bottom abutment piece (21). A protrusion (25) is fixed to the end of the bottom abutment piece (21) away from the rotating column (22). An adjustment structure is installed on the side of the protrusion (25) away from the bottom abutment piece (21). The adjustment structure is used to adjust the tilt angle of the bottom abutment piece (21).

7. The multi-section mesh belt heat pump drying device according to claim 6, characterized in that: The adjustment structure includes a second rack (28), which is disposed on the side of the protrusion (25) away from the bottom abutment piece (21). A rotating bar (26) is rotatably connected inside the drying chamber (2) and on the side of the second rack (28). A bar gear (27) is fixed on the outside of the rotating bar (26) and meshes with the second rack (28). A stepper motor (34) is installed on the outside of the drying chamber (2). The output end of the stepper motor (34) passes through the drying chamber (2) and extends into the interior of the drying chamber (2) to connect with the rotating bar (26). An adapter structure is installed between the drive shaft (18) and the fixed plate (30). The adapter structure is used to keep the drive shaft (18) in the same position when the rotating roller (12) moves up and down.

8. The multi-section mesh belt heat pump drying device according to claim 7, characterized in that: The adapter structure includes a groove (32) which is located on the outside of the rotating roller (12). A slider (33) is provided inside the drive shaft (18), and the slider (33) extends into the groove (32) and is slidably connected to the rotating roller (12). A rotating annular bar (13) is fixed at the bottom of the drive shaft (18), and the rotating annular bar (13) is rotatably connected to the fixed plate (30).

9. The multi-section mesh belt heat pump drying device according to claim 8, characterized in that: The bottom abutment piece (21) has multiple water guide grooves (24) on its top, and the multiple water guide grooves (24) are inclined toward the end close to the protrusion (25).

10. An energy-saving control method for a multi-stage mesh belt heat pump drying device, characterized in that: This energy-saving control method is used to save energy in the multi-section mesh belt heat pump drying device as described in any one of claims 1-9, and the energy-saving control method includes: S1: Based on the type of material to be dried, the initial moisture content and the target moisture content, set the initial operating parameters of the system, start the device, and the material enters the drying chamber (2) through the feed trough (3) and is conveyed and dried sequentially by the multi-layer drying conveyor belt (5); S2: Real-time detection of the moisture content of the material on each layer of the drying conveyor belt (5), and adjustment of the tilt angle of the bottom contact plate (21) of the corresponding layer according to the moisture content detection result, thereby changing the swaying amplitude of the supporting elastic mesh pad (8). S3: Based on the moisture content of each layer of material, simultaneously adjust the conveying speed of each layer of drying conveyor belt (5) and the operating power of the heat pump drying system; S4: Real-time detection of the final moisture content of the material discharged from the discharge chute (4) forms a closed-loop verification to maintain steady-state energy-saving operation; when there is no material feeding, the device automatically enters standby energy-saving state.

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