Dual-drive structure of hot melt extruder

Abstract

The utility model relates to a dual-drive structure of a hot melt extruder, and relates to the technical field of pharmaceutical equipment.The dual-drive structure comprises a mounting plate, a holder is fixedly connected to the bottom surface of the mounting plate, a first motor is fixedly mounted on the inner wall of the holder, and a speed reducer is fixedly mounted on an output shaft of the first motor; and the upper surface of the speed reducer is fixedly connected with the bottom surface of a mounting plate. By arranging the first gearbox, the second gearbox, the connecting shaft, the connecting rod and other components, power is output to the speed reducer through the first motor to reduce the output rotating speed, and the speed reducer drives the first gearbox and the second gearbox to operate synchronously through connection of the connecting shaft, the first gearbox and the second gearbox; the first gear box and the second gear box can drive the corresponding spline shafts to rotate correspondingly, so that power output can be provided for the two connecting rods, the corresponding packing augers rotate, the bearing capacity needed by the connecting rods and the packing augers can be provided, the diameter of the screw can be smaller, and the length-diameter ratio can be 40: 1.

Description

Technical Field

[0001] This application relates to the field of pharmaceutical equipment technology, and in particular to a dual-drive structure for a hot melt extruder. Background Technology

[0002] Currently, in the pharmaceutical industry, hot melt extruders are frequently used to process pharmaceutical preparations, chemical products, materials science products, and food. Their application in the pharmaceutical field is particularly prominent, as they can be used to improve drug dissolution, increase the stability of formulations, and mask off-flavors of active drug ingredients.

[0003] Hot melt extrusion (HME) technology originated in the polymer processing field in the early 20th century, initially used for molding plastics and rubber. After the 1950s, with the optimization of screw extruders, its mixing efficiency and production capacity significantly improved. From the 1980s onwards, the pharmaceutical industry discovered that HME could solve the solubilization problem of poorly soluble drugs, propelling it to become a key technology in drug delivery systems. After 2010, with the rise of controlled-release formulations and 3D-printed drugs, HME further expanded into the high-end formulation field. A hot melt extruder consists of a feeding system, screw, heating and temperature control system, die, and transmission device.

[0004] Currently, both domestic and international hot melt extruders adopt single-sided drive, connecting one side of the two screws to the gearbox. Hot melt extruders with screw diameters of 11mm or more typically have a screw length-to-diameter ratio of 40:1, while those with screw diameters of less than 11mm usually have a length-to-diameter ratio of 20:1. Due to the smaller screw diameter, the screw's load-bearing capacity decreases. When processing high-polymer materials, the high viscosity of the material results in greater resistance to the screw. If designed according to a 40:1 ratio, it can lead to screw deformation or even breakage. This results in hot melt extruders with screw diameters less than 11mm having a length-to-diameter ratio of 20:1, which hinders the transition from small to large equipment and thus negates the value of small-scale experimental machines. Utility Model Content

[0005] The purpose of this application is to provide a dual-drive structure for a hot melt extruder, which has the advantages of being able to drive the corresponding screws to rotate through gearbox one and gearbox two respectively, providing the required load-bearing capacity for the connecting rod and auger, allowing for a smaller screw diameter, and achieving a length-to-diameter ratio of 40:1, thus solving the problems mentioned in the background art.

[0006] The dual-drive structure of a hot melt extruder provided in this application adopts the following technical solution: it includes a mounting plate, a retainer is fixedly connected to the bottom surface of the mounting plate, a motor is fixedly installed on the inner wall of the retainer, a reducer is fixedly installed on the output shaft of the motor, the upper surface of the reducer is fixedly connected to the bottom surface of the mounting plate, a gearbox is fixedly installed on the output end of the reducer, a gearbox is fixedly installed on the inner wall of the mounting plate, the outer surface of the gearbox is fixedly connected to the inner wall of the mounting plate, and a connecting shaft is fixedly installed between the output end of the gearbox and the input end of the gearbox.

[0007] A machine cylinder is provided above the mounting plate. A discharge port is provided on the front of the machine cylinder. Two connecting rods are rotatably connected to the inner wall of the machine cylinder. An auger is fixedly installed on the outer surface of each connecting rod. A spline shaft is fixedly installed at the far end of each connecting rod. The other end of each spline shaft is fixedly connected to the output end of the corresponding gearbox one and gearbox two. A feed hopper is fixedly connected to the upper surface of the machine cylinder.

[0008] By adopting the above technical solution, a feed hopper is set up to facilitate the entry of materials into the barrel, a motor is set up to provide power, a reducer is used to reduce the output speed, and a connecting shaft connects gearbox one and gearbox two, so that the torque output by the reducer can drive gearbox one and gearbox two to operate synchronously, so that gearbox one and gearbox two can drive the corresponding spline shaft to rotate, thereby providing power output to the two connecting rods, causing the corresponding auger to rotate, providing the required load-bearing capacity for the connecting rods and auger, allowing the screw diameter to be smaller, and the length-to-diameter ratio to be 40:1.

[0009] Preferably, a support frame is fixedly installed on the bottom surface of the mounting plate, a protective shell is fixedly installed on the upper surface of the mounting plate, and a control module is fixedly installed on the front of the protective shell.

[0010] By adopting the above technical solution, a support frame is set on the bottom surface of the mounting plate to support the mounting plate and other components. The protective shell is installed on the upper surface of the mounting plate, and a control module is set on the front of the protective shell. The control module facilitates the adjustment of the speed of motor one according to the torque output.

[0011] Preferably, two limiting members are fixedly installed on the bottom surface of the mounting plate, and the inner wall of each limiting member is rotatably connected to the outer surface of the connecting shaft.

[0012] By adopting the above technical solution, the limiting component is set on the bottom surface of the mounting plate and connected to the connecting shaft to limit the connection shaft, so that the connecting shaft can provide power transmission for the normal operation of gearbox one and gearbox two.

[0013] Preferably, the upper surface of the mounting plate is fixedly connected to two support members, and the inner wall of each support member is fixedly connected to the outer surface of the barrel.

[0014] By adopting the above technical solution, the support component is installed on the upper surface of the mounting plate and fixed to the barrel, thereby achieving support for the barrel.

[0015] Preferably, a mounting shell is fixedly connected to the outer surface of the feed hopper, and a heating wire is fixedly installed on the inner wall of the mounting shell.

[0016] By adopting the above technical solution, the mounting shell is set on the outer surface of the feed hopper to fix the mounting shell, and the heating wire is set inside the mounting shell to facilitate the transfer of heat to the feed hopper.

[0017] Preferably, a support plate is fixedly installed on the outer surface of the feed hopper, and two connecting frames are fixedly installed on the bottom surface of the support plate. The bottom end of each connecting frame is fixedly connected to the upper surface of the mounting plate, and a temperature sensor is fixedly installed on the inner wall of the feed hopper.

[0018] By adopting the above technical solution, a support plate is set on the outer surface of the feed hopper, and the connecting frame is fixed to the mounting plate and the support plate to support the feed hopper. A temperature sensor is set on the inner wall of the feed hopper to facilitate the detection of the temperature of the material inside the feed hopper.

[0019] Preferably, a second motor is fixedly installed on the upper surface of the feed hopper, and a rotating rod is fixedly connected to the output shaft of the second motor. The outer surface of the rotating rod is rotatably connected to the inner wall of the feed hopper, and stirring rods arranged at equal intervals are fixedly connected to the outer surface of the rotating rod.

[0020] By adopting the above technical solution, motor two is set on the upper surface of the feed hopper, and the rotating rod is installed on the output shaft of motor two, so that motor two can drive the rotating rod to rotate, thereby enabling the rotating rod to drive the stirring rod on the surface to stir the material.

[0021] Preferably, a first connector and a second connector are fixedly installed on the outer surface of the rotating rod. Two scraping rods are fixedly installed on the outer surface of the first connector, and the end of each scraping rod that is close to the other is fixedly connected to the end of the second connector.

[0022] By adopting the above technical solution, connecting parts one and two are set on the surface of the rotating rod, and the scraping rod is fixed to connecting parts one and two, so that the rotating rod can drive the scraping rod to perform scraping operation on the feed hopper, preventing the material from adhering to the inner wall of the feed hopper.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] This hot melt extruder features a dual-drive structure. It includes gearbox one, gearbox two, a connecting shaft, and connecting rods. Motor one outputs power to a reducer to lower the output speed. The connecting shaft connects to gearboxes one and two, allowing the reducer to drive them synchronously. Gearboxes one and two then drive their respective splined shafts, providing power to the two connecting rods and rotating the corresponding augers. This provides the necessary load-bearing capacity for the connecting rods and augers, allowing for a smaller screw diameter and a length-to-diameter ratio of up to 40:1. A temperature sensor monitors the material temperature inside the feed hopper. When the temperature is too low, a heating wire and motor two are activated simultaneously. The heating wire heats the material, while motor two drives the rotating rod, connecting part one, scraper rod, connecting part two, and stirring rod to rotate. The stirring rod agitates the material, achieving heating and stirring to prevent solidification. The scraper rod prevents material from adhering to the inner wall of the feed hopper. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the entire application in three dimensions;

[0026] Figure 2 This is a front view of the overall main view of this application;

[0027] Figure 3 This is a schematic diagram showing the connection relationship between the cage and the motor in this application;

[0028] Figure 4 This is a structural diagram illustrating the connection relationship between the connecting shaft and the limiting component in this application;

[0029] Figure 5 This is a structural diagram illustrating the connection between the connecting rod and the auger in this application;

[0030] Figure 6 This is a schematic diagram of the internal structure of the feed hopper in this application.

[0031] In the picture:

[0032] 1. Mounting plate; 2. Cage; 3. Motor 1; 4. Reducer; 5. Gearbox 1; 6. Gearbox 2; 7. Connecting shaft; 8. Barrel; 9. Connecting rod; 10. Screwdriver; 11. Splined shaft; 12. Discharge port; 13. Feed hopper; 14. Limiting component; 15. Support frame; 16. Protective shell; 17. Control module; 18. Support component; 19. Mounting shell; 20. Heating wire; 21. Support plate; 22. Connecting frame; 23. Temperature sensor; 24. Motor 2; 25. Rotating rod; 26. Connecting component 1; 27. Scraper rod; 28. Connecting component 2; 29. ​​Stirring rod. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0034] Example 1: A dual-drive structure for a hot melt extruder includes a mounting plate 1. A retainer 2 is fixedly connected to the bottom surface of the mounting plate 1. A motor 3 is fixedly mounted on the inner wall of the retainer 2. A reducer 4 is fixedly mounted on the output shaft of the motor 3. The motor 3 provides power, and the reducer 4 reduces the output speed. The upper surface of the reducer 4 is fixedly connected to the bottom surface of the mounting plate 1. A gearbox 5 is fixedly mounted on the output end of the reducer 4. A gearbox 6 is fixedly mounted on the inner wall of the mounting plate 1. The outer surface of the gearbox 5 is fixedly connected to the inner wall of the mounting plate 1. A connecting shaft 7 is fixedly mounted between the output end of the gearbox 5 and the input end of the gearbox 6. Gearbox 5 and gearbox 6 are connected by connecting shaft 7, so that the torque output by reducer 4 can drive gearbox 5 and gearbox 6 to operate synchronously. A support frame 15 is fixedly installed on the bottom surface of mounting plate 1, and a protective shell 16 is fixedly installed on the upper surface of mounting plate 1. A control module 17 is fixedly installed on the front of protective shell 16. The support frame 15 is set on the bottom surface of mounting plate 1 to support mounting plate 1 and other components. The protective shell 16 is installed on the upper surface of mounting plate 1, and the control module 17 is set on the front of protective shell 16. The control module 17 facilitates the adjustment of the speed of motor 3 according to the torque output.

[0035] A barrel 8 is located above the mounting plate 1. A discharge port 12 is provided on the front of the barrel 8. Two connecting rods 9 are rotatably connected to the inner wall of the barrel 8. An auger 10 is fixedly installed on the outer surface of each connecting rod 9. A splined shaft 11 is fixedly installed at the far end of each connecting rod 9, so that gearbox 5 and gearbox 6 can drive the corresponding splined shaft 11 to rotate, thereby providing power output to the two connecting rods 9, causing the corresponding auger 10 to rotate, providing the required load-bearing capacity for the connecting rods 9 and auger 10, allowing the screw diameter to be smaller and the length-to-diameter ratio to be 40:1. The other end of each splined shaft 11 is fixedly connected to the output end of the corresponding gearbox 5 and gearbox 6. A feed hopper 13 is fixedly connected to the upper surface of the barrel 8, and the feed hopper 13 is provided to facilitate the entry of materials into the barrel 8.

[0036] Example 2: A dual-drive structure for a hot melt extruder. Two support members 18 are fixedly connected to the upper surface of the mounting plate 1. The inner wall of each support member 18 is fixedly connected to the outer surface of the barrel 8. The support members 18 are installed on the upper surface of the mounting plate 1 and fixed to the barrel 8 to support the barrel 8. Two limiting members 14 are fixedly installed on the bottom surface of the mounting plate 1. The inner wall of each limiting member 14 is rotatably connected to the outer surface of the connecting shaft 7. The limiting members 14 are set on the bottom surface of the mounting plate 1 and connected to the connecting shaft 7 to limit the movement of the connecting shaft 7, so that the connecting shaft 7 can provide power transmission for the normal operation of gearbox 5 and gearbox 6.

[0037] A mounting shell 19 is fixedly connected to the outer surface of the feed hopper 13. A heating wire 20 is fixedly installed on the inner wall of the mounting shell 19. The mounting shell 19 is fixed on the outer surface of the feed hopper 13 to fix the mounting shell 19. The heating wire 20 is placed inside the mounting shell 19 to facilitate the transfer of heat to the feed hopper 13. A temperature sensor 23 is fixedly installed on the inner wall of the feed hopper 13 to facilitate the detection of the temperature of the material inside the feed hopper 13. A support plate 21 is fixedly installed on the outer surface of the feed hopper 13. Two connecting brackets 22 are fixedly installed on the bottom surface of the support plate 21. The bottom end of each connecting bracket 22 is fixedly connected to the upper surface of the mounting plate 1. The support plate 21 is set on the outer surface of the feed hopper 13, and the connecting brackets 22 are fixed to the mounting plate 1 and the support plate 21 to support the feed hopper 13.

[0038] A second motor 24 is fixedly mounted on the upper surface of the feed hopper 13. A rotating rod 25 is fixedly connected to the output shaft of the second motor 24. The outer surface of the rotating rod 25 is rotatably connected to the inner wall of the feed hopper 13. Equally spaced stirring rods 29 are fixedly connected to the outer surface of the rotating rod 25. By positioning the second motor 24 on the upper surface of the feed hopper 13 and mounting the rotating rod 25 on its output shaft, the second motor 24 can drive the rotating rod 25 to rotate, thereby enabling the rotating rod 25 to drive the stirring rods 29 on its surface to stir the material. Connector 1 26 and connector 28 are fixedly installed on the outer surface of the rotating rod 25. Two scraper rods 27 are fixedly installed on the outer surface of connector 1 26. The end of each scraper rod 27 that is close to each other is fixedly connected to the end of connector 28. Connector 1 26 and connector 28 are set on the surface of the rotating rod 25, and the scraper rods 27 are fixed to connector 1 26 and connector 28, so that the rotating rod 25 can drive the scraper rods 27 to perform scraping operation on the feed hopper 13, preventing material from adhering to the inner wall of the feed hopper 13.

[0039] The implementation principle of this application embodiment is as follows: The temperature sensor 23 detects the temperature of the material inside the feed hopper 13. When the temperature is too low, the heating wire 20 is activated to heat the material. Subsequently, the motor 24 is activated to rotate the rotating rod 25. The rotating rod 25 drives the connecting part 26, the scraper rod 27, the connecting part 28, and the stirring rod 29 to rotate. The stirring rod 29 stirs the material, achieving heating and stirring to prevent the material from solidifying. The scraper rod 27 prevents the material from adhering to the inner wall of the feed hopper 13. At this time, the material falls into the lower machine. The cylinder 8 starts the motor 3 to output power, and the output speed is reduced by the reducer 4. The reducer 4 connects to the gearbox 5 and gearbox 6 through the connecting shaft 7, so that the reducer 4 drives the gearbox 5 and gearbox 6 to operate synchronously. In turn, the gearbox 5 and gearbox 6 can drive the corresponding spline shaft 11 to rotate, thereby providing power output to the two connecting rods 9, so that the corresponding auger 10 can rotate. This provides the required load-bearing capacity for the connecting rods 9 and auger 10, so that the screw diameter can be smaller and the length-to-diameter ratio can be 40:1.

[0040] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-drive structure for a hot melt extruder, comprising a mounting plate (1), characterized in that: A retainer (2) is fixedly connected to the bottom surface of the mounting plate (1). A motor (3) is fixedly installed on the inner wall of the retainer (2). A reducer (4) is fixedly installed on the output shaft of the motor (3). The upper surface of the reducer (4) is fixedly connected to the bottom surface of the mounting plate (1). A gearbox (5) is fixedly installed at the output end of the reducer (4). A gearbox (6) is fixedly installed on the inner wall of the mounting plate (1). The outer surface of the gearbox (5) is fixedly connected to the inner wall of the mounting plate (1). A connecting shaft (7) is fixedly installed between the output end of the gearbox (5) and the input end of the gearbox (6). The mounting plate (1) is provided with a machine barrel (8) above it. The front of the machine barrel (8) is provided with a discharge port (12). The inner wall of the machine barrel (8) is rotatably connected to two connecting rods (9). Each connecting rod (9) is fixedly installed with an auger (10) on its outer surface. Each connecting rod (9) is fixedly installed with a spline shaft (11) at one end away from each other. The other end of each spline shaft (11) is fixedly connected to the output end of the corresponding gearbox one (5) and gearbox two (6). The upper surface of the machine barrel (8) is fixedly connected to a feed hopper (13).

2. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: A support frame (15) is fixedly installed on the bottom surface of the mounting plate (1), a protective shell (16) is fixedly installed on the upper surface of the mounting plate (1), and a control module (17) is fixedly installed on the front of the protective shell (16).

3. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: Two limiting members (14) are fixedly installed on the bottom surface of the mounting plate (1), and the inner wall of each limiting member (14) is rotatably connected to the outer surface of the connecting shaft (7).

4. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: The upper surface of the mounting plate (1) is fixedly connected to two support members (18), and the inner wall of each support member (18) is fixedly connected to the outer surface of the barrel (8).

5. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: The outer surface of the feed hopper (13) is fixedly connected to the mounting shell (19), and the inner wall of the mounting shell (19) is fixedly installed with a heating wire (20).

6. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: A support plate (21) is fixedly installed on the outer surface of the feed hopper (13). Two connecting frames (22) are fixedly installed on the bottom surface of the support plate (21). The bottom end of each connecting frame (22) is fixedly connected to the upper surface of the mounting plate (1). A temperature sensor (23) is fixedly installed on the inner wall of the feed hopper (13).

7. The dual-drive structure of a hot melt extruder according to claim 1, characterized in that: The upper surface of the feed hopper (13) is fixedly mounted with a second motor (24), and the output shaft of the second motor (24) is fixedly connected to a rotating rod (25). The outer surface of the rotating rod (25) is rotatably connected to the inner wall of the feed hopper (13), and the outer surface of the rotating rod (25) is fixedly connected with stirring rods (29) arranged at equal intervals.

8. The dual-drive structure of a hot melt extruder according to claim 7, characterized in that: The outer surface of the rotating rod (25) is fixedly installed with a first connector (26) and a second connector (28). The outer surface of the first connector (26) is fixedly installed with two scraping rods (27). The end of each scraping rod (27) that is close to each other is fixedly connected to the end of the second connector (28).

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