Side feeding conveying system for conveying low-stacking-density filler

Abstract

The invention relates to the field of plastic processing machinery, in particular to a side feeding conveying system for conveying low-stacking-density filler, which comprises a hopper, a screw cylinder and a screw structure, the screw cylinder is mounted on an extruder, the screw structure is arranged in the screw cylinder, the hopper is mounted on the screw cylinder, and the side feeding conveying system further comprises a stirring device. The stirring device comprises a supporting frame, a stirring motor and a stirring stick, the supporting frame is installed on the hopper, the stirring motor is installed on the supporting frame, the stirring stick is fixedly connected with an output shaft of the stirring motor, and stirring blades are installed at the end, away from the stirring motor, of the stirring stick. The feeding device has the effect of effectively solving the blocking problem possibly occurring in the feeding process.

Description

Technical Field

[0001] The present invention relates to the field of plastic processing machinery, and more particularly to a side feeding conveying system for conveying low bulk density fillers. Background Art

[0002] Extruder is a kind of plastic machinery, which is widely used in various industries, especially in the fields of plastic products, packaging, construction, medical treatment, home furnishing and automobile. The extruder heats plastic or other plastic materials and injects them into the mold for molding through the pressure and shear force generated by the rotation of the screw.

[0003] Extruders are usually equipped with a feeding system. Traditional side feeding systems often use DC or AC driven co-rotating twin screws for feeding, but the conveying capacity of this system is limited, especially when dealing with fillers with low bulk density (such as powders).

[0004] Although the existing side feeding system already includes an exhaust port and an exhaust system, which forms a negative pressure environment in the hopper to avoid the accumulation of fillers, the wind force is usually small to avoid sucking out the fillers during the exhaust process. When the single feeding amount is too large, blockage problems will still occur during the feeding process. Summary of the invention

[0005] In order to effectively solve the blockage problem that may occur during the feeding process, the present application provides a side feeding conveying system for conveying low bulk density fillers.

[0006] The side feeding conveying system for conveying low bulk density fillers provided in the present application adopts the following technical solution: A side feeding conveying system for conveying low bulk density fillers, comprising a hopper, a barrel and a screw structure, wherein the barrel is mounted on an extruder, the screw structure is arranged in the barrel, the hopper is mounted on the barrel, and also comprises a stirring device, the stirring device comprises a support frame, a stirring motor and a stirring rod, the support frame is mounted on the hopper, the stirring motor is mounted on the support frame, the stirring rod is fixedly connected to the output shaft of the stirring motor, and a stirring blade is installed at one end of the stirring rod away from the stirring motor.

[0007] By adopting the above technical solution, the support frame is installed on the hopper, the stirring motor is installed on the support frame, the stirring rod is fixedly connected to the output shaft of the stirring motor, and when feeding the material into the screw barrel through the hopper, the stirring motor is started and the stirring blade is driven to rotate by the stirring rod, thereby avoiding the accumulation of fillers in the hopper, thereby effectively solving the blockage problem that may occur during the feeding process.

[0008] In a specific possible implementation scheme, the stirring device also includes a driving plate, a guide rod and a limit plate, the driving plate is mounted on a support frame, one end of the guide rod is rotatably connected to the driving plate and is fixedly connected to the output shaft of the driving motor, one end of the stirring rod is mounted on the guide rod, and a driving gear is mounted on the stirring rod adjacent to one end of the guide rod, gear teeth are provided on the edge of the driving plate, the driving gear is meshed with the gear teeth, the limit plate is mounted on the support frame, the stirring rod is disposed through the limit plate at one end away from the driving motor, and can rotate relative to the limit plate.

[0009] By adopting the above technical solution, the driving plate is installed on the supporting frame, the guide rod is rotatably connected to the driving plate and connected to the output shaft of the stirring motor, one end of the stirring rod is rotatably connected to the guide rod, a driving gear is provided on the stirring rod, and gear teeth are provided on the edge of the driving plate. Through the cooperation of the driving gear and the gear teeth, the stirring rod is limited to rotate evenly in the hopper, thereby expanding the stirring area of ​​the stirring blade, thereby further improving the stirring effect of the stirring blade and avoiding clogging of the filler.

[0010] In a specific feasible implementation scheme, the screw structure includes a drive motor, a first screw and a second screw, the drive motor is installed on the screw barrel, the first screw and the second screw are both arranged as a twin-screw structure, the first screw and the second screw are installed in the screw barrel, the first screw and the second screw are arranged to be fully meshed, and two drive motors are arranged, and the two drive motors are arranged corresponding to the first screw and the second screw, respectively, and are connected to the two, respectively.

[0011] By adopting the above technical solution, the driving motor drives the first screw to rotate, and the first screw is meshed with the second screw. The twin-screw structure can provide a larger conveying area and a stronger driving force, thereby more effectively conveying low bulk density fillers to the extruder, helping to reduce resistance and blockage during the conveying process, and ensuring continuous and stable conveying of the filler.

[0012] In a specific embodiment, the taper of the first screw and the second screw is set between 25° and 35°.

[0013] By adopting the above technical solution, the taper of the screw is set between 25° and 35°, which can ensure that the screw effectively pushes the filler forward during rotation and reduce the accumulation and clogging of the filler.

[0014] In a specific implementation manner, the thread diameters of the first screw and the second screw are gradually reduced from one end adjacent to the drive motor to the other end, and the thread grooves on the first screw and the second screw have thread diameters corresponding to the thread diameters from large to small.

[0015] By adopting the above technical solution, the screw diameters of the first screw and the second screw are gradually reduced from one end adjacent to the driving motor to the other end, and the corresponding screw diameters of the screw grooves on the first screw and the second screw are set from large to small. As the screw diameter decreases and the screw groove depth becomes shallower, the flow speed of the material gradually increases and the conveying efficiency is correspondingly improved.

[0016] In a specific embodiment, the compression ratio of the first screw and the second screw is set between 3:2 and 3:1.

[0017] By adopting the above technical solution, the compression ratio of the first screw and the second screw is set between 3:2-3:1, which can reduce the compression and expansion of the material during the conveying and extrusion process, thereby reducing the formation of bubbles and gaps.

[0018] In a specific possible implementation scheme, the hopper includes an outer shell and an inner shell, the outer shell is connected to the inner shell, the outer shell and the inner shell are both configured to be hopper-shaped, a hopper cavity is formed between the outer shell and the inner shell, an exhaust port is provided at the upper end of the outer shell, and an air inlet is provided at the lower end of the inner shell.

[0019] By adopting the above technical solution, the inner shell and the outer shell are connected to form a complete hopper, a hopper cavity is formed between the inner shell and the outer shell, an exhaust port is provided at the upper end of the outer shell, and an air inlet is provided at the lower end of the inner shell. The external exhaust device is connected to the exhaust port, so that air in the hopper is evacuated through the air inlet, forming a negative pressure state in the hopper, which helps to reduce the resistance of the filler in the hopper and in the process of entering the screw barrel, thereby improving the conveying efficiency and reducing the probability of the filler accumulating at the discharge port at the lower end of the hopper.

[0020] In a specific embodiment, the device further comprises a baffle installed in the hopper cavity.

[0021] By adopting the above technical solution, the baffle is installed in the hopper cavity. When the exhaust system is started, the baffle should be able to cooperate with it to ensure that the gas can be discharged smoothly through the exhaust port instead of being blocked by the baffle or accumulated in the hopper, thereby ensuring the smoothness of feeding.

[0022] In a specific feasible implementation scheme, a plurality of baffles are provided, and the baffles are evenly and staggeredly installed on the side walls of the outer shell and the inner shell along the height direction. The baffles are arranged at an angle, and the baffles installed on the outer shell are arranged at an angle downward toward the inner shell, and the baffles installed on the inner shell are arranged at an angle downward toward the outer shell.

[0023] By adopting the above technical solution, a plurality of baffles are staggeredly arranged on the outer shell and the inner shell, so as to further improve the fluidity of the filler and reduce accumulation and clogging.

[0024] In a specific possible implementation mode, the hopper is detachably connected to the screw barrel via a flange, and a sealing gasket is provided at the connection between the hopper and the screw barrel.

[0025] By adopting the above technical solution, the hopper is detachably connected to the screw barrel through the flange, and a sealing gasket is provided at the connection between the two, so as to facilitate disassembly and maintenance while ensuring the sealing of the connection between the two.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The support frame is installed on the hopper, the stirring motor is installed on the support frame, and the stirring rod is fixedly connected to the output shaft of the stirring motor. When feeding the material into the barrel through the hopper, the stirring motor is started, and the stirring blade is driven to rotate by the stirring rod, so as to avoid the accumulation of fillers in the hopper, thereby effectively solving the blockage problem that may occur during the feeding process; 2. The driving plate is mounted on the support frame, the guide rod is rotatably connected to the driving plate and connected to the output shaft of the stirring motor, one end of the stirring rod is rotatably connected to the guide rod, a driving gear is provided on the stirring rod, and gear teeth are provided at the edge of the driving plate. Through the cooperation of the driving gear and the gear teeth, the stirring rod is limited to rotate evenly in the hopper, thereby expanding the stirring area of ​​the stirring blade, thereby further improving the stirring effect of the stirring blade and avoiding clogging of the filler; 3. The inner shell and the outer shell are connected to form a complete hopper. A hopper cavity is formed between the inner shell and the outer shell. An exhaust port is provided at the upper end of the outer shell, and an air inlet is provided at the lower end of the inner shell. The external exhaust device is connected to the exhaust port, so that air in the hopper is extracted through the air inlet to form a negative pressure state in the hopper, which helps to reduce the resistance of the filler in the hopper and in the process of entering the screw barrel, thereby improving the conveying efficiency and reducing the probability of filler accumulation at the outlet at the lower end of the hopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0029] Figure 3 for Figure 2 Enlarged view of part A.

[0030] Figure 4 for Figure 2 Enlarged view of part B.

[0031] Figure 5 Schematic diagram of the structure of the stirring device in the embodiment of the present application.

[0032] Explanation of the accompanying drawings: 1. Hopper; 11. Outer shell; 12. Inner shell; 13. Hopper cavity; 14. Exhaust port; 15. Air inlet; 2. Screw barrel; 3. Screw structure; 31. Drive motor; 32. First screw; 33. Second screw; 4. Stirring device; 41. Support frame; 42. Stirring motor; 43. Stirring stick; 431. Universal ball; 44. Drive plate; 45. Guide rod; 46. Limit plate; 461. Ball socket; 47. Stirring blade; 5. Baffle; 6. Flange; 7. Sealing gasket. DETAILED DESCRIPTION

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0035] The embodiment of the present application discloses a side feeding conveying system for conveying low bulk density fillers.

[0036] like Figure 1 As shown, the side feeding conveying system for conveying low bulk density fillers includes a hopper 1, a barrel 2, a screw structure 3 and a stirring device 4. The barrel 2 is installed on the extruder, the screw structure 3 is installed in the barrel 2, the hopper 1 is installed on the barrel 2, and the stirring device 4 is installed in the barrel 2. The stirring device 4 is used to stir the filler when feeding the material into the barrel 2 through the hopper 1, so as to improve the smoothness of feeding and avoid the accumulation and blockage of the filler.

[0037] like Figure 2As shown, the screw structure 3 includes a driving motor 31, a first screw 32 and a second screw 33. The driving motor 31 is installed on the side wall of the barrel 2, and the output shaft of the driving motor 31 passes through the side wall of the barrel 2. The first screw 32 and the second screw 33 are installed in the barrel 2. The first screw 32 and the second screw 33 are both rotatably connected in the barrel 2. Two driving motors 31 are provided. The two driving motors 31 are respectively arranged corresponding to the first screw 32 and the second screw 33, and are respectively connected to the first screw 32 and the second screw 33. Screw grooves are provided on the first screw 32 and the second screw 33. The first screw 32 and the second screw 33 are fully meshed and can drive the second screw 33 to rotate by the rotation of the first screw 32. The taper of the first screw 32 and the second screw 33 is preferably set between 25° and 35°. It can ensure that the screw effectively pushes the filler forward during rotation, reducing the accumulation and clogging of the filler. The compression ratio of the first screw 32 and the second screw 33 is set between 3:2-3:1, which can reduce the compression and expansion of the material during transportation and extrusion, thereby reducing the formation of bubbles and gaps. The screw diameters of the first screw 32 and the second screw 33 are gradually reduced from one end adjacent to the drive motor 31 to the other end, and the corresponding screw diameters of the screw grooves on the first screw 32 and the second screw 33 are set from large to small. As the screw diameter decreases and the depth of the screw groove becomes shallower, the flow speed of the material gradually increases, and the conveying efficiency is correspondingly improved. In other embodiments, the screw structure 3 can also adopt a single screw device, and the barrel 2 is preferably set to be conical, and the taper of the barrel 2 is preferably set between 50°-70°.

[0038] like Figure 3 and Figure 4 As shown, the hopper 1 includes an outer shell 11 and an inner shell 12, the outer shell 11 and the inner shell 12 are connected to form a complete hopper 1, a hopper cavity 13 is formed between the inner shell 12 and the outer shell 11, an exhaust port 14 is opened at the upper end of the outer shell 11, and an air inlet 15 is opened at the lower end of the inner shell 12. The upper exhaust port 14 is usually connected to a common exhaust device, so that air in the hopper 1 is exhausted through the air inlet 15, and a negative pressure state is formed in the hopper 1, which helps to reduce the resistance of the filler in the hopper 1 and in the process of entering the screw barrel 2, thereby improving the conveying efficiency and reducing the probability of the filler accumulating at the discharge port at the lower end of the hopper 1. A flange 6 is provided at the connection between the lower end of the outer shell 11 and the lower end of the inner shell 12, a feed port is opened on the screw barrel 2, and a flange 6 is installed at the feed port. The hopper 1 and the screw barrel 2 are connected by two flanges 6, and a sealing gasket 7 is provided at the connection between the two flanges 6, so as to facilitate disassembly and maintenance while ensuring the sealing of the connection between the two.

[0039] In the embodiment of the present application, a baffle 5 is also included. A plurality of baffles 5 are provided. The plurality of baffles 5 are staggeredly installed in sequence along the height direction on the side wall of the outer shell 11 and the side wall of the inner shell 12 in the cavity of the material port. The plurality of baffles 5 are all installed at an angle. The baffle 5 installed on the side wall of the outer shell 11 is tilted downwardly toward the inner shell 12, and the baffle 5 installed on the inner shell 12 is tilted downwardly toward the outer shell 11. When the exhaust system is started, the baffle 5 should be able to cooperate with its work to ensure that the gas can be discharged smoothly through the exhaust port. Several baffles 5 are staggered on the outer shell 11 and the inner shell 12 to further improve the fluidity of the filler and reduce accumulation and blockage.

[0040] like Figure 5 As shown, the stirring device 4 includes a support frame 41, a stirring motor 42, a stirring stick 43, a driving plate 44, a guide rod 45 and a limit plate 46. The support frame 41 is installed on the outer wall of the shell 11, the stirring motor 42 is installed on the support frame 41, the driving plate 44 is fixedly installed on the side of the support frame 41 away from the stirring motor 42, the guide rod 45 is rotatably connected to the driving plate 44, and the output shaft of the stirring motor 42 passes through the support frame 41 and the driving plate 44 is fixedly connected to one end of the guide rod 45, one end of the stirring stick 43 passes through the guide rod 45 and is fixedly connected to the guide rod 45, and the stirring stick 43 is arranged adjacent to one end of the guide rod 45 There is a driving gear, and gear teeth are provided on the edge of the driving plate 44. The driving gear is meshed with the gear teeth. The limit plate 46 is installed at the lower end of the support frame 41. The stirring rod 43 is away from the stirring motor 42 and passes through the limit plate 46. A universal ball 431 is provided on the stirring rod 43, and a ball socket 461 is provided on the limit plate 46. The universal ball 431 is installed in the ball socket 461, so as to ensure that the stirring rod 43 can be universally rotated under the limiting action of the limit plate 46. The stirring rod 43 is arranged in the hopper 1 at one end adjacent to the limit plate 46, and a stirring blade 47 is provided at this end. The stirring blade 47 can adopt a blade device commonly found on the market.

[0041] The support frame 41 is mounted on the hopper 1, the stirring motor 42 is mounted on the support frame 41, the stirring rod 43 is fixedly connected to the output shaft of the stirring motor 42, when the material is fed into the screw barrel 2 through the hopper 1, the driving plate 44 is mounted on the support frame 41, the guide plate is rotatably connected to the driving plate 44 and connected to the output shaft of the stirring motor 42, one end of the stirring rod 43 is rotatably connected to the guide plate, the stirring motor 42 is started, the stirring rod 43 drives the guide rod 45 to rotate, the guide rod 45 drives the stirring rod 43 to rotate, and the stirring A driving gear is provided on the stick 43, and gear teeth are provided on the edge of the driving plate 44. Through the cooperation between the driving gear and the gear teeth, the other end of the stirring stick 43 cooperates with the ball socket 461 on the limiting plate 46 through the universal ball 431, so as to be connected to the limiting plate 46. Therefore, through the cooperation between the driving gear and the gear teeth and the universal ball 431 and the ball socket 461, the stirring stick 43 is limited to rotate evenly in the hopper 1, and the stirring area of ​​the stirring blade 47 is expanded, thereby further improving the stirring effect of the stirring blade 47 and avoiding clogging of the filler.

[0042] The implementation principle of a side feeding conveying system for conveying low bulk density fillers in the embodiment of the present application is as follows: a support frame 41 is installed on the hopper 1, a stirring motor 42 is installed on the support frame 41, a stirring rod 43 is fixedly connected to the output shaft of the stirring motor 42, when feeding the material into the screw barrel 2 through the hopper 1, the external exhaust device is connected to the exhaust port 14, so that air in the hopper 1 is exhausted through the air inlet 15, and a negative pressure state is formed in the hopper 1, a driving plate 44 is installed on the support frame 41, a guide plate is rotatably connected to the driving plate 44 and connected to the output shaft of the stirring motor 42, one end of the stirring rod 43 is rotatably connected to the guide plate, the stirring motor 42 is started, and the guide rod 45 is driven to rotate through the stirring rod 43, and the guide rod 45 drives the stirring rod 43 to rotate, a driving gear is provided on the stirring rod 43, and the edge of the driving plate 44 Gear teeth are provided, and through the cooperation between the driving gear and the gear teeth, the other end of the stirring rod 43 is connected to the limit plate 46 through the cooperation between the universal ball 431 and the ball socket 461 on the limit plate 46, so as to limit the stirring rod 43 to rotate evenly in the hopper 1 through the cooperation between the driving gear and the gear teeth and the universal ball 431 and the ball socket 461, thereby expanding the stirring area of ​​the stirring blade 47, thereby further improving the stirring effect of the stirring blade 47 and avoiding clogging of the filler. After the filler enters the screw barrel 2, the driving motor 31 drives the first screw 32 to rotate, and the first screw 32 is meshed with the second screw 33. The twin-screw structure 3 can provide a larger conveying area and a stronger driving force, so as to more effectively convey the low bulk density filler to the extruder, which helps to reduce the resistance and clogging during the conveying process and ensure the continuous and stable conveying of the filler.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A side feeding conveying system for conveying low bulk density fillers, comprising a hopper (1), a screw barrel (2) and a screw structure (3), wherein the screw barrel (2) is mounted on an extruder, the screw structure (3) is arranged in the screw barrel (2), and the hopper (1) is mounted on the screw barrel (2), characterized in that: The invention also comprises a stirring device (4), the stirring device (4) comprising a support frame (41), a stirring motor (42) and a stirring rod (43), the support frame (41) being mounted on the hopper (1), the stirring motor (42) being mounted on the support frame (41), the stirring rod (43) being fixedly connected to an output shaft of the stirring motor (42), and a stirring blade (47) being mounted on one end of the stirring rod (43) away from the stirring motor (42).

2. The side feeding conveying system for conveying low bulk density fillers according to claim 1, characterized in that: The stirring device (4) further comprises a driving plate (44), a guide rod (45) and a limiting plate (46); the driving plate (44) is mounted on the support frame (41); one end of the guide rod (45) is rotatably connected to the driving plate (44) and is fixedly connected to the output shaft of the driving motor (31); one end of the stirring rod (43) is mounted on the guide rod (45); a driving gear is mounted on one end of the stirring rod (43) adjacent to the guide rod (45); gear teeth are provided on the edge of the driving plate (44); the driving gear meshes with the gear teeth; the limiting plate (46) is mounted on the support frame (41); the end of the stirring rod (43) away from the driving motor (31) passes through the limiting plate (46) and can rotate relative to the limiting plate (46).

3. The side feeding conveying system for conveying low bulk density fillers according to claim 1, characterized in that: The screw structure (3) comprises a driving motor (31), a first screw (32) and a second screw (33); the driving motor (31) is mounted on the screw barrel (2); the first screw (32) and the second screw (33) are both arranged as a twin-screw structure (3); the first screw (32) and the second screw (33) are mounted in the screw barrel (2); the first screw (32) and the second screw (33) are arranged in full meshing engagement; two driving motors (31) are arranged; the two driving motors (31) are arranged corresponding to the first screw (32) and the second screw (33), respectively, and are respectively connected to the first screw (32) and the second screw (33).

4. The side feeding conveying system for conveying low bulk density fillers according to claim 3, characterized in that: The taper of the first screw (32) and the second screw (33) is set between 25° and 35°.

5. The side feeding conveying system for conveying low bulk density fillers according to claim 3, characterized in that: The screw diameters of the first screw (32) and the second screw (33) are gradually reduced from one end adjacent to the drive motor (31) to the other end, and the screw grooves on the first screw (32) and the second screw (33) have corresponding screw diameters arranged from large to small.

6. The side feeding conveying system for conveying low bulk density fillers according to claim 1, characterized in that: The compression ratio of the first screw (32) and the second screw (33) is set between 3:2-3:

1.

7. The side feeding conveying system for conveying low bulk density fillers according to claim 1, characterized in that: The hopper (1) comprises an outer shell (11) and an inner shell (12); the outer shell (11) is connected to the inner shell (12); the outer shell (11) and the inner shell (12) are both arranged in a hopper shape; a hopper cavity (13) is formed between the outer shell (11) and the inner shell (12); an air exhaust port (14) is provided at the upper end of the outer shell (11); and an air inlet (15) is provided at the lower end of the inner shell (12).

8. The side feeding conveying system for conveying low bulk density fillers according to claim 7, characterized in that: It also comprises a baffle (5), wherein the baffle (5) is installed in the hopper cavity (13).

9. The side feeding conveying system for conveying low bulk density fillers according to claim 8, characterized in that: A plurality of baffles (5) are provided, and the plurality of baffles (5) are evenly and staggeredly installed on the side walls of the outer shell (11) and the inner shell (12) in the height direction. The baffles (5) are arranged obliquely. The baffles (5) installed on the outer shell (11) are arranged obliquely downward in the direction of the inner shell (12), and the baffles (5) installed on the inner shell (12) are arranged obliquely downward in the direction of the outer shell (11).

10. The side feeding conveying system for conveying low bulk density fillers according to claim 1, characterized in that: The hopper (1) is detachably connected to the screw barrel (2) via a flange (6), and a sealing gasket (7) is provided at the connection between the hopper (1) and the screw barrel (2).

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