A drying device and drying method for the production of hydroxypropyl methylcellulose

Abstract

This invention belongs to the field of hydroxypropyl methylcellulose (HMC) production technology, specifically a drying device and method for HMC production. Addressing the problems of easy accumulation of HMC during the filling process, insufficient drying inside the filling barrel leading to re-moistening of the raw material, heat loss, and raw material waste, the present invention proposes the following solution: A drying device for HMC production includes a drying cylinder. A support ring is fixedly fitted onto the outer wall of the drying cylinder. Multiple support legs are fixed to the bottom of the support ring for support. A conveyor belt is located below the drying cylinder for transporting the filling barrels. A bent pipe rotatably passes through the bottom of the drying cylinder for discharging the raw material into the filling barrels. This invention enables the even filling of the dried raw material into the filling barrels, ensuring the barrels can fully hold the raw material. Furthermore, the inner wall of the filling barrels is dried during the filling process, preventing the raw material from becoming damp inside the barrels.

Description

Technical Field

[0001] This invention relates to the field of hydroxypropyl methylcellulose production technology, and in particular to a drying equipment and drying method for the production of hydroxypropyl methylcellulose. Background Technology

[0002] Hydroxypropyl methylcellulose is widely used in industries such as synthetic resins, petrochemicals, ceramics, papermaking, leather, pharmaceuticals, food, and cosmetics, resulting in a large market demand. Drying is an essential step in its production and processing.

[0003] Existing technologies still have the following shortcomings when performing drying:

[0004] 1. The inside of the filling container cannot be dried during the filling process, which may cause the dried hydroxypropyl methylcellulose to become damp again inside the filling container;

[0005] 2. The drying of hydroxypropyl methylcellulose is usually carried out using hot air. However, after drying, the hot air is directly discharged into the environment carrying away moisture, which not only wastes heat energy but may also trap hydroxypropyl methylcellulose, resulting in further waste.

[0006] To address the above-mentioned problems, this invention proposes a drying equipment and drying method for the production of hydroxypropyl methylcellulose. Summary of the Invention

[0007] The purpose of this invention is to solve the shortcomings of existing drying equipment and methods for the production of hydroxypropyl methylcellulose, which are unable to dry the inside of the filling barrel, resulting in hydroxypropyl methylcellulose becoming damp again, heat loss, and waste of raw materials.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A drying device for the production of hydroxypropyl methylcellulose includes a drying cylinder, a support ring fixedly sleeved on the outer wall of the drying cylinder, a plurality of support legs fixed at the bottom of the support ring for support, a conveyor belt provided below the drying cylinder for transporting filling barrels, and a bent pipe rotatably passing through the bottom of the drying cylinder for discharging raw materials into the filling barrels.

[0010] It also includes an air injection ring sleeve, which is fitted on the outer wall of the drying cylinder to inject hot air into the drying cylinder to complete the drying operation. A filter box is fixed on one side of the drying cylinder, and a return air hose is provided at the bottom of the filter box to inject hot air into the air injection ring sleeve.

[0011] It also includes an exhaust pipe, which is located at the top of the drying cylinder. One end of the exhaust pipe is connected to the filter box for recovering hot air and raw material dust inside the drying cylinder.

[0012] An air guide pipe is installed on one side of the drying cylinder, and an exhaust plate is fixed at the bottom end of the air guide pipe for drying the filling barrels to be filled.

[0013] The drying structure is located inside the drying cylinder and is used to dry the raw materials inside the drying cylinder.

[0014] The drying structure, located below the drying cylinder, is used to dry the filling barrels to be filled.

[0015] The discharge structure is located inside the drying cylinder and is used to fill the dried raw materials into the filling barrel.

[0016] The recovery structure, located inside the filter box, is used to recover hot air and raw material dust.

[0017] In one possible design, the drying structure includes a stirring shaft rotating on the inner wall of the top of a drying cylinder. A drive motor is fixed to the top of the drying cylinder, and the output shaft of the drive motor is fixedly connected to the top of the stirring shaft via a coupling. A sliding cylinder is slidably fitted onto the outer wall of the stirring shaft via a groove and a slider. Multiple stirring blades for stirring raw materials are fixed to the outer wall of the sliding cylinder. Multiple first air injection holes are provided inside the drying cylinder, and multiple second air injection holes are provided on the inner wall of the air injection ring. The first and second air injection holes cooperate to inject hot air into the drying cylinder. An air inlet pipe is fixed to one side of the filter box, and a valve is provided inside the air inlet pipe for injecting outside air into the filter box for heating. The filter box is positioned near the air inlet pipe. Multiple heating elements are fixed to the inner side wall to heat the air entering the filter box. A fan is fixed to the bottom of the filter box via a frame. The fan's air inlet extends into the filter box, and the fan's air outlet is connected to a return air hose. One end of the return air hose is connected to an air injection ring. When the valve on the air inlet pipe is opened, the fan runs, drawing outside air into the filter box through the air inlet pipe. The heating elements heat the air. Then, the fan injects the hot air into the air injection ring through the return air hose. The first air injection hole and the second air injection hole are connected. The hot air in the air injection ring is injected into the drying cylinder to dry the raw materials. Then, the drive motor drives the stirring shaft, sliding cylinder, and stirring blades to rotate, stirring the raw materials to ensure uniform drying.

[0018] In one possible design, the drying structure includes two connecting arms at the bottom of the drying cylinder, with the same horizontal plate fixed to the bottom ends of the two connecting arms. The bottom end of the air guide pipe passes through the horizontal plate, and a valve is provided inside the air guide pipe. A connecting sleeve is rotatably fitted onto the outer wall of the air guide pipe. The bottom of the exhaust plate has multiple vent holes for drying the inner wall of the bottom of the filling barrel. The outer wall of the exhaust plate has multiple arc-shaped holes for drying the inner wall of the filling barrel. Hot air cooperates with the arc-shaped holes to drive the exhaust plate to rotate. The top end of the air guide pipe is rotatably connected to a corrugated hose, which is connected to a return air hose to inject hot air into the exhaust plate. The air guide pipe and the exhaust plate move down and extend into the filling barrel. At this time, a fan injects hot air into the exhaust plate, which dries the inner wall of the bottom of the filling barrel through the vent holes. In addition, hot air flows outward through the arc-shaped holes, and the cooperation between the hot air and the arc-shaped holes drives the exhaust plate to rotate, which dries the inner wall of the filling barrel.

[0019] In one possible design, the discharge structure includes a closed cone disposed within a drying cylinder, with the outer wall of the closed cone fitting against the inner wall of the drying cylinder to seal the bent pipe. The bottom end of the stirring shaft penetrates the closed cone, and the lowest stirring blade engages with the top of the closed cone. Multiple support rods are fixed to the bottom of the closed cone, with the bottom ends of each support rod slidingly penetrating the bottom inner wall of the drying cylinder and each fixed with the same connecting ring. An electric push rod is fixedly embedded in the bottom of the drying cylinder, with its output shaft fixedly connected to the top of the connecting ring. A connecting rope is provided at the top of the connecting ring, and the other end of the connecting rope is fixedly connected to a connecting sleeve. A guide wheel is rotatably connected between two connecting arms to guide the connecting rope. The outer wall of the bent pipe is fixed with a sleeve. A first synchronous pulley is provided, and a second synchronous pulley is slidably connected to the outer wall of the air guide pipe through a slider and a groove. The second synchronous pulley is rotatably connected to the bottom of the horizontal plate. The first and second synchronous pulleys are connected by a synchronous belt drive. The output shaft of the electric push rod drives the closed cone to move upward through the cooperation of the connecting ring and the support rod, releasing the closure of the bent pipe by the closed cone. At this time, the dried raw material is discharged into the filling barrel through the bent pipe. At the same time, the connecting ring extends the exhaust plate into the filling barrel through the cooperation of the connecting rope. When the exhaust plate rotates, it drives the air guide pipe to rotate. The air guide pipe drives the bent pipe to rotate through the cooperation of the first synchronous pulley, the second synchronous pulley and the synchronous belt. During the discharge, the raw material can be discharged in a ring shape in the filling barrel, avoiding the accumulation of raw material in one position, so that the filling barrel can be filled with more raw material.

[0020] In one possible design, the recycling structure includes a bent plate fixed inside a filter box, with an air inlet pipe located above the bent plate. A polytetrafluoroethylene (PTFE) membrane is fixed inside the bent plate for filtering moisture and raw material dust from the hot air. A striking rod is slidably inserted through the filter box and used to strike the bent plate. A trapezoidal groove is provided on one side of the striking rod. A lifting plate is slidably connected to one side of the filter box, with its bottom end fixedly connected to the top of a connecting sleeve. Multiple fixing posts are fixed to one side of the lifting plate, and these posts cooperate with the trapezoidal groove to drive the striking rod to move outwards. A connecting plate is fixed at one end away from the bending plate. A guide rod slides through the connecting plate and is fixed to one side of the filter box. A first tension spring, which is fixedly connected to the filter box, is sleeved on the outer wall of the guide rod. The other end of the first tension spring is fixedly connected to the connecting plate. When the air duct moves down, the air duct drives the lifting plate and the fixed column to move down through the connecting sleeve. The fixed column engages with the trapezoidal groove. The downward movement of the fixed column drives the striking rod outward, and the first tension spring begins to stretch. When the fixed column disengages from the trapezoidal groove, the first tension spring pulls the striking rod to reset. The striking rod can strike the bending plate to shake off the raw materials attached to the bending plate and the polytetrafluoroethylene membrane.

[0021] In one possible design, the bottom of the horizontal plate is fixed with multiple U-shaped brackets, which are used to support the timing belt and prevent the timing belt from sagging and disengaging from the first and second timing pulleys.

[0022] In one possible design, the bottom inner wall of the filter box is provided with a collection trough, which is located on the side of the PTFE membrane away from the striking rod. A return pipe is fixed to the bottom inner wall of the collection trough, and the bottom end of the return pipe extends into the drying cylinder. A valve is provided inside the return pipe. The striking rod strikes the bending plate, shaking off the raw material attached to the bending plate and the PTFE membrane. Then, the valve on the return pipe is opened to discharge the raw material on the collection trough back into the drying cylinder, thus avoiding waste of raw material.

[0023] In one possible design, the top of the bending plate is sloped to discharge raw material dust to one side, and the heating element is located below the bending plate to heat the air filtered by the polytetrafluoroethylene membrane.

[0024] In one possible design, multiple first L-shaped plates are fixed to the top and bottom of the support ring. The bottom of the drying cylinder has two annular grooves arranged vertically, and the multiple first L-shaped plates slide in conjunction with the corresponding annular grooves. The bottom of the support ring has an arc-shaped groove, in which a second L-shaped plate is slidably connected, and one end of the second L-shaped plate is fixedly connected to the air injection ring. A second tension spring is fixed to one inner wall of the arc-shaped groove, and one end of the second tension spring is fixedly connected to the second L-shaped plate. An electromagnet is fixed to the other inner wall of the arc-shaped groove. A sheet metal layer is fixed to the side of the second L-shaped plate away from the second tension spring. A magnetic attraction force is generated between the electromagnet and the sheet metal layer. The magnetic attraction force of the electromagnet is greater than the tension force of the second tension spring. When the electromagnet is energized, the electromagnet and the sheet metal layer on one side of the second L-shaped plate generate a magnetic attraction force, pulling the second L-shaped plate to one side. The magnetic attraction force of the electromagnet is greater than the tension force of the second tension spring. The second L-shaped plate drives the air injection ring to rotate. At this time, the first air injection hole and the second air injection hole are connected to inject hot air into the drying cylinder. Conversely, the first air injection hole can be closed to prevent raw materials from leaking into the air injection ring.

[0025] This application discloses a drying method using a drying device produced from hydroxypropyl methylcellulose, comprising the following steps:

[0026] S1. The raw material is placed in the drying cylinder, and hot air is circulated and injected by the heating fan. At the same time, the electromagnet drives the air injection ring to rotate, so that the first air injection hole and the second air injection hole are connected. The drive motor stirs the raw material to ensure uniform drying.

[0027] S2. Hot air and moisture are returned to the filter box through the exhaust pipe, filtered by a polytetrafluoroethylene membrane and then recycled to maintain drying efficiency and air quality.

[0028] S3. After drying is completed, the electric push rod lifts the closed cone and opens the bending pipe to discharge material into the filling barrel; at the same time, the air guide pipe and exhaust plate are inserted into the filling barrel under the action of the connecting rope, the air injection circulation is closed, and hot air is blown directly into the inner wall of the filling barrel. The hot air flow and the rotation of the exhaust plate are used to dry the inner surface of the barrel.

[0029] S4. When the exhaust plate rotates, the bending tube rotates in conjunction with it to achieve a circular distribution of raw materials in the filling barrel and optimize the filling effect.

[0030] S5. During the discharge process, the air duct descends and triggers a knocking mechanism to automatically clean the residual raw materials on the PTFE membrane and bending plate, and then recover them to the drying cylinder through the return pipe to reduce waste.

[0031] The beneficial effects of this invention are as follows: In this invention, the filter box is fixed with a bent plate, and a polytetrafluoroethylene membrane is fixed inside the bent plate. A striking rod is slidably passed through the filter box. A trapezoidal groove is provided on one side of the striking rod. A lifting plate is slidably connected to one side of the filter box. Multiple fixing columns are fixed on one side of the lifting plate. The connecting sleeve drives the lifting plate to move down. The fixing columns cooperate with the trapezoidal groove. The downward movement of the fixing columns drives the striking rod to the outside. When the fixing columns disengage from the trapezoidal groove, the first tension spring pulls the striking rod to reset and strike the bent plate, which is used to shake off the raw materials attached to the bent plate and the polytetrafluoroethylene membrane. The raw materials are then discharged back into the drying cylinder through the return pipe, avoiding waste of raw materials and preventing the adhesion of the polytetrafluoroethylene membrane from affecting air circulation.

[0032] In this invention, a connecting rope is fixed between the top of the connecting ring and one side of the connecting sleeve; a guide wheel is rotatably connected between the two connecting arms; a first synchronous wheel is fixedly sleeved on the outer wall of the bent tube; a second synchronous wheel, rotatably connected to the bottom of the horizontal plate, is slidably connected to the outer wall of the air guide tube; and multiple arc-shaped holes are provided on the outer wall of the exhaust plate. When the connecting ring moves upward, the exhaust plate extends into the filling barrel through the cooperation of the connecting rope. Hot air and the arc-shaped holes drive the exhaust plate to rotate. The air guide tube drives the bent tube to rotate through the cooperation of the first synchronous wheel, the second synchronous wheel, and the synchronous belt. During material discharge, the raw material can be discharged in a ring shape in the filling barrel, avoiding the accumulation of raw material in one position, and allowing the filling barrel to hold more raw material.

[0033] In this invention, the bottom end of the air guide pipe passes through the horizontal plate and is fixedly connected to the top of the exhaust plate. A connecting sleeve is rotatably fitted on the outer wall of the air guide pipe. A connecting rope is fixed between the top of the connecting ring and one side of the connecting sleeve. The bottom of the exhaust plate is provided with multiple air vents, and the outer wall of the exhaust plate is provided with multiple arc-shaped holes. The air guide pipe and the exhaust plate move down and extend into the filling barrel. At this time, the blower injects hot air into the exhaust plate, which dries the bottom inner wall of the filling barrel through the air vents. In addition, the hot air flows outward through the arc-shaped holes, and the cooperation between the hot air and the arc-shaped holes drives the exhaust plate to rotate, which is used to dry the inner wall of the filling barrel and prevent the dried raw materials from getting damp again in the filling barrel.

[0034] In this invention, the dried raw materials can be evenly filled into the filling barrel, so that the filling barrel can fully hold the raw materials. During the filling process, the inner wall of the filling barrel can be dried to prevent the raw materials from getting damp inside the filling barrel. In addition, when drying the raw materials, the moisture and raw material dust carried in the hot air can be filtered out, which not only ensures the dryness of the hot air in the later stage, but also avoids the waste of raw materials. Attached Figure Description

[0035] Figure 1This is a three-dimensional structural schematic diagram of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention;

[0036] Figure 2 This is a schematic diagram of the main cross-sectional structure of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention;

[0037] Figure 3 This is a three-dimensional cross-sectional view of the drying cylinder of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention;

[0038] Figure 4 This is a three-dimensional exploded view of the sliding cylinder, closed cone, and connecting ring of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention.

[0039] Figure 5 This is a three-dimensional cross-sectional view of the filter box of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention.

[0040] Figure 6 This is a three-dimensional exploded structural diagram of the horizontal plate, guide wheel, and connecting corrugated hose of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention.

[0041] Figure 7 This is a top cross-sectional view of the exhaust disc of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention.

[0042] Figure 8 This is a three-dimensional exploded view of the striking rod, fixing column, and guide rod of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 1 of the present invention;

[0043] Figure 9 This is a three-dimensional cross-sectional view of the air injection ring of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 2 of the present invention;

[0044] Figure 10 This is a three-dimensional exploded view of the support ring and the second L-shaped plate of a drying device for the production of hydroxypropyl methylcellulose provided in Embodiment 2 of the present invention.

[0045] In the diagram: 1. Drying cylinder; 2. Support ring; 3. Conveyor belt; 4. Stirring shaft; 5. Drive motor; 6. Sliding cylinder; 7. Stirring blade; 8. Enclosed cone; 9. Support rod; 10. Connecting ring; 11. Electric push rod; 12. Air injection ring sleeve; 13. First air injection hole; 14. Second air injection hole; 15. Exhaust pipe; 16. Filter box; 17. Air inlet pipe; 18. Fan; 19. Return air hose; 20. Heating element; 21. Connecting corrugated hose; 22. Connecting arm; 23. Horizontal plate; 24. Guide wheel; 25. Connecting rope; 26. Connecting... 27. Connecting sleeve; 28. Air guide pipe; 29. ​​Exhaust disc; 30. Vent hole; 31. Arc-shaped hole; 32. Bending pipe; 33. First synchronous pulley; 34. Second synchronous pulley; 35. U-shaped frame; 36. Bending plate; 37. PTFE membrane; 38. Striking rod; 49. Connecting plate; 40. Guide rod; 41. First tension spring; 42. Lifting plate; 43. Fixed column; 44. Trapezoidal groove; 45. Collection groove; 46. Return pipe; 47. First L-shaped plate; 48. Second L-shaped plate; 49. Arc-shaped groove; 50. Second tension spring; 61. Electromagnet. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] Example 1: Refer to Figure 1 and Figure 2 The drying equipment, used in the production of hydroxypropyl methylcellulose, mainly includes a drying cylinder 1. A support ring 2 is fixedly fitted onto the outer wall of the drying cylinder 1. Multiple support legs are welded or bolted to the bottom of the support ring 2 to ensure stable placement of the equipment. A conveyor belt 3 is located below the drying cylinder 1, used to transport filling barrels to receive the dried raw materials.

[0048] Reference Figure 2 and Figure 3 The bottom of the drying cylinder 1 is rotatably connected by a bent tube 31. The design of the bent tube 31 allows the raw material to be smoothly discharged from the bottom of the drying cylinder 1 into the filling barrel.

[0049] Reference Figures 1-3 The equipment also includes an air injection ring 12 fitted on the outer wall of the drying cylinder 1. The air injection ring 12 is connected to the filter box 16 through a pipe and is used to inject hot air into the drying cylinder 1 to complete the drying operation. The bottom of the filter box 16 is provided with a return air hose 19, which guides the heated air from the filter box 16 into the air injection ring 12.

[0050] Reference Figure 1 and Figure 2In order to recover the hot air and raw material dust in the drying cylinder 1, an exhaust pipe 15 is provided at the top of the drying cylinder 1. One end of the exhaust pipe 15 is connected to the filter box 16 to ensure that the hot air and dust can enter the filter box 16 for recovery.

[0051] Reference Figures 1-4 Inside the drying cylinder 1, a drying structure is provided, specifically including a stirring shaft 4 rotating on the inner wall of the top of the drying cylinder 1. A drive motor 5 is fixed to the top of the drying cylinder 1, and the output shaft of the drive motor 5 is fixedly connected to the top of the stirring shaft 4 through a coupling to drive the stirring shaft 4 to rotate. A sliding cylinder 6 is slidably fitted onto the outer wall of the stirring shaft 4 through a sliding groove and a slider. Multiple stirring blades 7 are fixed to the outer wall of the sliding cylinder 6 to achieve stirring of the raw materials. The drying cylinder 1 has multiple first air injection holes 13, and the inner wall of the air injection ring sleeve 12 has multiple second air injection holes 14 corresponding to the first air injection holes 13. By opening the valve on the air inlet pipe 17, the fan 18 draws outside air into the filter box 16, the heating element 20 heats the air, and then the fan 18 injects the hot air into the air injection ring sleeve 12 through the return air hose 19. Then, through the cooperation of the first air injection holes 13 and the second air injection holes 14, the hot air is injected into the drying cylinder 1 to dry the raw materials.

[0052] Reference Figure 2 , Figure 6 and Figure 7 Below the drying cylinder 1, a drying structure is provided, specifically including two connecting arms 22, which are fixed to the bottom of the drying cylinder 1 and connected by a horizontal plate 23 fixed at the bottom. The bottom end of the air guide pipe 27 passes through the horizontal plate 23, and a valve is provided inside to control the flow of hot air. A connecting sleeve 26 is rotatably fitted on the outer wall of the air guide pipe 27 to ensure the stability of the air guide pipe 27 during movement. The exhaust plate 28 is fixed to the bottom end of the air guide pipe 27, and its bottom is provided with multiple vent holes 29 for drying the bottom inner wall of the filling barrel, while its outer wall is provided with multiple arc-shaped holes 30 for drying the inner wall of the filling barrel. Hot air is introduced into the exhaust plate 28 from the return air hose 19 through the connecting corrugated hose 21, and dries the filling barrel from all directions through the vent holes 29 and arc-shaped holes 30. At the same time, the cooperation of the hot air and the arc-shaped holes 30 can also drive the exhaust plate 28 to rotate, improving the drying efficiency.

[0053] Reference Figure 3 , Figure 4 and Figure 6 The discharge structure is mainly achieved through the bending pipe 31. After the raw material is dried, the raw material is discharged into the filling barrel below by controlling the rotation and position adjustment of the bending pipe 31.

[0054] The enclosure 8 is designed to seal the bending tube 31 when necessary. Inside the drying cylinder 1, an enclosure 8 is installed, with its outer wall tightly fitted to the inner wall of the drying cylinder 1. This design ensures that the raw material will not be accidentally discharged through the bending tube 31 during the drying process.

[0055] The mixing shaft 4 and the mixing blade 7 are matched: the bottom end of the mixing shaft 4 passes through the closed cone 8, and the mixing blade 7 at the bottom matches the top of the closed cone 8 to ensure that the raw materials can be mixed evenly during the mixing process and to prevent the raw materials from accumulating on the top of the closed cone 8.

[0056] Connection between support rod 9 and electric push rod 11: Multiple support rods 9 are fixed to the bottom of the closed cone 8. The bottom ends of these support rods 9 slide through the bottom inner wall of the drying cylinder 1 and are collectively fixed to a connecting ring 10. An electric push rod 11 is fixedly embedded in the bottom of the drying cylinder 1, and its output shaft is fixedly connected to the top of the connecting ring 10. When the electric push rod 11 works, it drives the closed cone 8 to move upward through the cooperation of the connecting ring 10 and the support rods 9, thereby releasing the closure of the bent tube 31.

[0057] Linkage between connecting rope 25 and exhaust disc 28: A connecting rope 25 is provided at the top of the connecting ring 10, and the other end of the connecting rope 25 is fixedly connected to the connecting sleeve 26. A guide wheel 24 is rotatably connected between the two connecting arms 22 to guide the connecting rope 25. When the closed cone 8 moves upward, the connecting ring 10, through the traction of the connecting rope 25, causes the exhaust disc 28 and the air guide pipe 27 on it to extend into the filling barrel.

[0058] The transmission via synchronous pulleys and synchronous belts: A first synchronous pulley 32 is fixedly sleeved on the outer wall of the bent tube 31, while a second synchronous pulley 33 is slidably connected to the outer wall of the air guide tube 27 via a slider and a groove. The second synchronous pulley 33 is rotatably connected to the bottom of the horizontal plate 23. The first synchronous pulley 32 and the second synchronous pulley 33 are connected by a synchronous belt. When the air guide tube 27 rotates, the bent tube 31 is driven to rotate synchronously through the transmission of the synchronous belt, thereby ensuring that the raw material is distributed in a ring shape inside the filling barrel during discharge, preventing accumulation.

[0059] Reference Figure 2 , Figure 5 , Figure 6 and Figure 8 The recovery structure is integrated within the filter box 16. Through the design of the filter box 16, hot air and raw material dust can be effectively recovered. The heated air can be recycled, improving energy efficiency and reducing dust pollution to the environment. The recovery structure is designed to recover and filter moisture and raw material dust from the hot air, specifically as follows:

[0060] Filtration by the bent plate 35 and the polytetrafluoroethylene membrane 36: A bent plate 35 is installed inside the filter box 16, and the air inlet pipe 17 is located above the bent plate 35. A polytetrafluoroethylene membrane 36 is fixed inside the bent plate 35 for efficient filtration of moisture and raw material dust in the hot air.

[0061] Automatic striking of the striking rod 37: A striking rod 37 is slidably inserted through the filter box 16 to strike the bent plate 35 to remove the raw material adhering to it. A trapezoidal groove 43 is provided on one side of the striking rod 37, and a lifting plate 41 is slidably connected to one side of the filter box 16. The bottom end of the lifting plate 41 is fixedly connected to the top of the connecting sleeve 26. Multiple fixing posts 42 are fixed to one side of the lifting plate 41, and these fixing posts 42 cooperate with the trapezoidal groove 43. A connecting plate 38 is fixed to one end of the striking rod 37, and a guide rod 39, fixedly connected to the filter box 16, slides through the connecting plate 38. When the air guide pipe 27 moves downward, it drives the lifting plate 41 and fixing posts 42 downward through the connecting sleeve 26. The fixing posts 42 cooperate with the trapezoidal groove 43, driving the striking rod 37 outward. At this time, the first tension spring 40 begins to stretch. When the fixed column 42 disengages from the trapezoidal groove 43, the first tension spring 40 pulls the striking rod 37 to reset, and the striking rod 37 strikes the bending plate 35 to achieve automatic dust removal.

[0062] Reference Figure 6 To ensure that the synchronous belt does not sag or detach from the first synchronous pulley 32 and the second synchronous pulley 33 during transmission, multiple U-shaped frames 34 are fixed at the bottom of the horizontal plate 23. These U-shaped frames 34 are used to support the synchronous belt and ensure the stability and reliability of the transmission.

[0063] Reference Figure 2 and Figure 5 To achieve effective raw material recovery and reduce waste, this embodiment features a specially designed structure for the filter box 16. Specifically, a collection trough 44 is provided on the bottom inner wall of the filter box 16, located on the side of the polytetrafluoroethylene membrane 36 away from the striking rod 37. Thus, when the striking rod 37 periodically strikes the bending plate 35, the raw material adhering to the bending plate 35 and the polytetrafluoroethylene membrane 36 is shaken into the collection trough 44. To reuse this raw material, a return pipe 45 is fixed to the bottom inner wall of the collection trough 44, with its bottom end extending into the interior of the drying cylinder 1. A valve is installed inside the return pipe 45; when raw material recovery is needed, simply opening the valve allows the raw material in the collection trough 44 to be discharged back into the drying cylinder 1 through the return pipe 45, effectively preventing waste.

[0064] Reference Figure 5To further optimize the handling of raw material dust and the air heating effect, this embodiment features a specific design for the position and shape of the bending plate 35 and the heating element 20. The top of the bending plate 35 is designed as a slope, which helps to concentrate the raw material dust to one side for easier subsequent processing. Meanwhile, the heating element 20 is installed below the bending plate 35 to heat the air filtered through the polytetrafluoroethylene membrane 36. This arrangement not only improves the efficiency of air heating but also ensures that the heated air flows evenly to the raw material inside the drying cylinder 1, thereby enhancing the drying effect.

[0065] The above embodiments describe in detail the specific structure and operation of the drying equipment used in the production of hydroxypropyl methylcellulose, ensuring the feasibility and operability of the equipment.

[0066] Example 2: Reference Figure 9 and Figure 10 Based on Example 1, this embodiment features an innovative design for the connection structure between the support ring 2 and the drying cylinder 1 to achieve precise injection of hot air during the drying process and prevent raw material leakage. Multiple first L-shaped plates 46 are fixed to the top and bottom of the support ring 2, while the bottom of the drying cylinder 1 has two annular grooves arranged vertically. These first L-shaped plates 46 slide in conjunction with the corresponding annular grooves, thereby ensuring that the support ring 2 can move stably and flexibly relative to the drying cylinder 1.

[0067] refer to Figure 9 and Figure 10 In addition, the bottom of the support ring 2 is provided with an arc-shaped groove 48, in which a second L-shaped plate 47 is slidably connected. One end of the second L-shaped plate 47 is fixedly connected to the air injection ring sleeve 12. A second tension spring 49 is fixed to one inner wall of the arc-shaped groove 48, and its other end is fixedly connected to the second L-shaped plate 47 to provide a restoring force. At the same time, an electromagnet 50 is fixed to the other inner wall of the arc-shaped groove 48. When the electromagnet 50 is energized, it will generate a magnetic attraction force with the iron sheet layer on one side of the second L-shaped plate 47. This magnetic attraction force is greater than the tension force of the second tension spring 49, thereby pushing the second L-shaped plate 47 to one side.

[0068] This design ensures that when the electromagnet 50 is energized, the second L-shaped plate 47 rotates the connected air injection ring 12, connecting the first air injection hole 13 and the second air injection hole 14, allowing hot air to be injected into the drying cylinder 1 through these two holes. When the electromagnet 50 is de-energized, the tension of the second tension spring 49 causes the second L-shaped plate 47 to return to its original position, sealing the first air injection hole 13 and preventing raw materials from leaking into the air injection ring 12 during the drying process. This design ensures precise injection of hot air while effectively preventing raw material leakage.

[0069] A drying method for a drying apparatus used in the production of hydroxypropyl methylcellulose includes the following steps:

[0070] S1. The raw material is put into the drying cylinder 1. During drying, the valve on the air inlet pipe 17 is opened and the fan 18 is run. The outside air is drawn into the filter box 16 through the air inlet pipe 17, and the heating element 20 is used to heat the air. Then the fan 18 injects the hot air into the air injection ring 12 through the return air hose 19. The electromagnet 50 is energized. The electromagnet 50 and the iron sheet layer on one side of the second L-shaped plate 47 generate a magnetic attraction force to pull the second L-shaped plate 47 to one side. The magnetic attraction force of the electromagnet 50 is greater than the tension force of the second tension spring 49. The second L-shaped plate 47 drives the air injection ring 12 to rotate. At this time, the first air injection hole 13 and the second air injection hole 14 are connected. The hot air in the air injection ring 12 is injected into the drying cylinder 1 for drying the raw material. Then the drive motor 5 drives the stirring shaft 4, the sliding cylinder 6 and the stirring blade 7 to rotate for stirring the raw material and making the raw material dry evenly.

[0071] S2. During the drying process, the hot air and moisture in the drying cylinder 1 are returned to the filter box 16 through the exhaust pipe 15 and then discharged back into the drying cylinder 1 by the fan 18 for the reuse of heat energy. The polytetrafluoroethylene membrane 36 can filter the moisture in the hot air and the raw material dust entrained therein, ensuring the dryness of the air injected into the drying cylinder 1 by the fan 18.

[0072] S3. After drying, the output shaft of the electric push rod 11, through the cooperation of the connecting ring 10 and the support rod 9, drives the closed cone 8 and the sliding cylinder 6 to move upward, releasing the seal of the closed cone 8 on the bent pipe 31. At this time, the dried raw material is discharged into the filling barrel through the bent pipe 31, and the next filling barrel to be filled can be dried. Specifically, the connecting ring 10 and the connecting sleeve 26 are connected by the connecting rope 25. The connecting ring 10 moves upward, and the air guide pipe 27 and the exhaust plate 28 move downward and extend to... Inside the filling barrel, the valve on the air duct 27 is opened, the electromagnet 50 is de-energized, the second L-shaped plate 47 is reset under the tension of the second tension spring 49, the first air injection hole 13 and the second air injection hole 14 are misaligned, at this time the blower 18 injects hot air into the exhaust plate 28, and dries the bottom inner wall of the filling barrel through the vent hole 29. In addition, the hot air flows outward through the arc hole 30, and the cooperation between the hot air and the arc hole 30 drives the exhaust plate 28 to rotate, which is used to dry the inner wall of the filling barrel.

[0073] S4. In addition, when the exhaust plate 28 rotates, it drives the air guide pipe 27 to rotate. The air guide pipe 27 drives the bent pipe 31 to rotate through the cooperation of the first synchronous pulley 32, the second synchronous pulley 33 and the synchronous belt. During material discharge, the raw material can be discharged in a ring shape in the filling barrel, avoiding the accumulation of raw material in one position, so that the filling barrel can be filled with more raw material.

[0074] S5. In addition, when the air guide pipe 27 moves down, the air guide pipe 27 drives the lifting plate 41 and the fixed column 42 to move down through the connecting sleeve 26. The fixed column 42 cooperates with the trapezoidal groove 43. The downward movement of the fixed column 42 drives the striking rod 37 outward. The first tension spring 40 starts to stretch. When the fixed column 42 disengages from the trapezoidal groove 43, the first tension spring 40 pulls the striking rod 37 to reset. The striking rod 37 can strike the bending plate 35 to shake off the raw materials attached to the bending plate 35 and the polytetrafluoroethylene film 36. Then, the valve on the return pipe 45 is opened to discharge the raw materials on the collection tank 44 back into the drying cylinder 1 to avoid waste of raw materials.

[0075] However, as is well known to those skilled in the art, the working principles and wiring methods of the electromagnet 50, fan 18, heating element 20, electric push rod 11 and drive motor 5 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drying apparatus for the production of hydroxypropyl methylcellulose, characterized in that, The device includes a drying cylinder, with a support ring fixedly fitted on the outer wall of the drying cylinder. Multiple support legs are fixed at the bottom of the support ring for support. A conveyor belt is provided below the drying cylinder for transporting filling barrels. A bent pipe is rotatably passed through the bottom of the drying cylinder for discharging raw materials into the filling barrels. It also includes an air injection ring sleeve, which is fitted on the outer wall of the drying cylinder to inject hot air into the drying cylinder to complete the drying operation. A filter box is fixed on one side of the drying cylinder, and a return air hose is provided at the bottom of the filter box to inject hot air into the air injection ring sleeve. It also includes an exhaust pipe, which is located at the top of the drying cylinder. One end of the exhaust pipe is connected to the filter box, which is used to recover the hot air and raw material dust inside the drying cylinder. An air guide pipe is installed on one side of the drying cylinder, and an exhaust plate is fixed at the bottom of the air guide pipe for drying the filling barrels to be filled. The drying structure is located inside the drying cylinder and is used to dry the raw materials inside the drying cylinder. The drying structure, located below the drying cylinder, is used to dry the filling barrels to be filled. The discharge structure is located inside the drying cylinder and is used to fill the dried raw materials into the filling barrel. The recovery structure, located inside the filter box, is used to recover hot air and raw material dust. The drying structure includes two connecting arms at the bottom of the drying cylinder. The bottom ends of the two connecting arms are fixed with the same horizontal plate. The bottom end of the air guide pipe passes through the horizontal plate. A valve is installed inside the air guide pipe. The top end of the air guide pipe is rotatably connected to a corrugated hose, and the corrugated hose is connected to the return air hose for injecting hot air into the exhaust plate. The outer wall of the air guide pipe is fitted with a connecting sleeve, and the bottom of the exhaust plate is provided with multiple air vents for drying the inner wall of the bottom of the filling barrel. The outer wall of the exhaust plate is provided with multiple arc-shaped holes for drying the inner wall of the filling barrel, and the hot air cooperates with the arc-shaped holes to drive the exhaust plate to rotate. The discharge structure includes a closed cone set inside the drying cylinder. Multiple support rods are fixed at the bottom of the closed cone. The bottom ends of the multiple support rods slide through the bottom inner wall of the drying cylinder and are all fixed with the same connecting ring. An electric push rod is fixedly embedded at the bottom of the drying cylinder. The output shaft of the electric push rod is fixedly connected to the top of the connecting ring. A connecting rope is provided at the top of the connecting ring. The other end of the connecting rope is fixedly connected to the connecting sleeve. An air inlet pipe is fixed to one side of the filter box. The recovery structure includes a bent plate fixed inside the filter box. The air inlet pipe is located above the bent plate. A polytetrafluoroethylene membrane is fixed inside the bent plate for filtering moisture and raw material dust in the hot air. A striking rod is slidably passed through the filter box and is used to strike the bent plate. A trapezoidal groove is provided on one side of the striking rod. A lifting plate is slidably connected to one side of the filter box. The bottom end of the lifting plate is fixedly connected to the top of the connecting sleeve. Multiple fixing columns are fixed to one side of the lifting plate, and the fixing columns cooperate with the trapezoidal groove to drive the striking rod to move outward.

2. The drying equipment for the production of hydroxypropyl methylcellulose according to claim 1, characterized in that, The drying structure includes a stirring shaft rotating on the inner wall of the top of the drying cylinder. A drive motor is fixed to the top of the drying cylinder, and the output shaft of the drive motor is fixedly connected to the top of the stirring shaft via a coupling. A sliding cylinder is slidably fitted onto the outer wall of the stirring shaft via a sliding groove and a slider. Multiple stirring blades for stirring raw materials are fixed to the outer wall of the sliding cylinder. Multiple first air injection holes are provided inside the drying cylinder, and multiple second air injection holes are provided on the inner wall of the air injection ring. The first and second air injection holes cooperate to inject hot air into the drying cylinder. A valve is provided in the air inlet pipe for injecting outside air into the filter box for heating. Multiple heating plates are fixed to the inner wall of the filter box near the air inlet pipe for heating the air entering the filter box. A fan is fixed to the bottom of the filter box via a frame. The air inlet of the fan extends into the filter box, and the air outlet of the fan is connected to a return air hose. One end of the return air hose is connected to the air injection ring.

3. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 2, characterized in that, The outer wall of the closed cone fits against the inner wall of the drying cylinder to seal the bent pipe. The bottom end of the stirring shaft passes through the closed cone. The stirring blade at the bottom fits with the top of the closed cone. A guide wheel is rotatably connected between the two connecting arms to guide the connecting rope. A first synchronous wheel is fixedly sleeved on the outer wall of the bent pipe. A second synchronous wheel is slidably connected to the outer wall of the air guide pipe through a slider and a groove. The second synchronous wheel is rotatably connected to the bottom of the horizontal plate. The first synchronous wheel and the second synchronous wheel are connected by a synchronous belt drive.

4. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 3, characterized in that, A connecting plate is fixed to the end of the striking rod away from the bending plate. A guide rod slides through the connecting plate and is fixed to one side of the filter box. A first tension spring is fitted on the outer wall of the guide rod and is fixedly connected to the filter box. The other end of the first tension spring is fixedly connected to the connecting plate.

5. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 4, characterized in that, Multiple U-shaped brackets are fixed to the bottom of the horizontal plate, and the U-shaped brackets are used to support the timing belt.

6. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 5, characterized in that, The bottom inner wall of the filter box is provided with a collection tank, which is located on the side of the polytetrafluoroethylene membrane away from the striking rod. A return pipe is fixed to the bottom inner wall of the collection tank, and the bottom end of the return pipe extends into the drying cylinder. A valve is provided inside the return pipe.

7. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 6, characterized in that, The top of the bending plate is sloping to discharge raw material dust to one side, and the heating element is located below the bending plate.

8. A drying apparatus for the production of hydroxypropyl methylcellulose according to claim 7, characterized in that, Multiple first L-shaped plates are fixed at the top and bottom of the support ring. The bottom of the drying cylinder has two annular grooves arranged vertically, and the multiple first L-shaped plates slide in cooperation with the corresponding annular grooves. The bottom of the support ring has an arc-shaped groove, and a second L-shaped plate is slidably connected in the arc-shaped groove. One end of the second L-shaped plate is fixedly connected to the air injection ring. A second tension spring is fixed on one side of the inner wall of the arc-shaped groove, and one end of the second tension spring is fixedly connected to the second L-shaped plate. An electromagnet is fixed on the other side of the inner wall of the arc-shaped groove. A sheet metal layer is fixed on the side of the second L-shaped plate away from the second tension spring. A magnetic attraction force is generated between the electromagnet and the sheet metal layer. The magnetic attraction force of the electromagnet is greater than the tension force of the second tension spring.

9. A drying method using the drying equipment for the production of hydroxypropyl methylcellulose as described in claim 8, characterized in that, Includes the following steps: S1. The raw material is placed in the drying cylinder, and hot air is circulated and injected by the heating fan. At the same time, the electromagnet drives the air injection ring to rotate, so that the first air injection hole and the second air injection hole are connected. The drive motor stirs the raw material to ensure uniform drying. S2. Hot air and moisture are returned to the filter box through the exhaust pipe, filtered by a polytetrafluoroethylene membrane and then recycled to maintain drying efficiency and air quality. S3. After drying is completed, the electric push rod lifts the closed cone and opens the bending pipe to discharge material into the filling barrel; at the same time, the air guide pipe and exhaust plate are inserted into the filling barrel under the action of the connecting rope, the air injection circulation is closed, and hot air is blown directly into the inner wall of the filling barrel. The hot air flow and the rotation of the exhaust plate are used to dry the inner surface of the barrel. S4. When the exhaust plate rotates, the bending tube rotates in conjunction with it to achieve a circular distribution of raw materials in the filling barrel and optimize the filling effect. S5. During the discharge process, the air duct descends and triggers a knocking mechanism to automatically clean the residual raw materials on the PTFE membrane and bending plate, and then recover them to the drying cylinder through the return pipe to reduce waste.

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