Air drying device for double-screw extruder

Abstract

The air drying device for the double-screw extruder comprises an outer frame cylinder, hot air drying equipment and a guide structure, a supporting roller is rotationally installed in the outer frame cylinder through a shaft rod, the hot air drying equipment is fixedly installed at the top end of the outer frame cylinder, and the guide structure comprises a bottom end guide roller and an upper end guide roller. Bottom mounting plates are rotationally arranged on the two sides of the bottom end guide roller correspondingly. The utility model relates to the technical field of air drying equipment for extruders. According to the air-drying device for the double-screw extruder, when materials are located in the outer frame cylinder, external air is heated through the hot air-drying equipment and blown into the outer frame cylinder, so that a dry inner cavity with a certain temperature is formed in the outer frame cylinder, and then moisture on the surfaces of the materials can be effectively air-dried; according to the air-drying device, materials can be prevented from being influenced by external temperature and air flow during drying, so that the purpose of improving the air-drying efficiency and the drying effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-drying equipment for extruders, in particular to an air-drying device for a twin-screw extruder. Background Art

[0002] The twin-screw extruder is developed based on the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the molding processing of extruded products.

[0003] During the twin-screw extruder process, the molten polymer may pass through a cooling unit to cool the strands. During this process, the strands will absorb a certain amount of moisture. The main function of the air dryer is to quickly remove moisture from the strand surface through forced ventilation or blowers to ensure the quality of subsequent processing.

[0004] Chinese patent publication number CN216465711U relates to an air-drying device for material strips extruded by an extruder, comprising a blower, an air duct and an air guide hood, wherein the air duct introduces the blower airflow into the air guide hood, and at least a pair of strip-shaped air outlets are arranged at intervals on the air guide hood, a heating element is provided at a position of the air outlet on one side of the air guide hood, and a diverter plate is further provided in the air guide hood, which can divide the air guide hood into two chambers and divert the airflow in the air duct into the chambers on both sides respectively, and the heating element is placed in one of the chambers; when the material strips pass through the air-drying device, large water droplets are first blown away by the air flow, and then the stubborn water droplets are evaporated by hot air to achieve a better air-drying effect.

[0005] However, in the above patent, the effect of first removing water droplets and then air-drying is achieved mainly by discharging cold and hot air through two exhaust ports respectively, and contacting the extruded cooled material in turn. However, the cold and hot air are easily affected by the external temperature and air flow after being discharged, making it difficult for the discharged air to accurately contact the extruded material. In addition, when drying water droplets on the surface of the material, it is also easy to cause the material to shake, which further affects the efficiency and effect of drying. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an air-drying device for a twin-screw extruder, so as to solve the technical problems mentioned in the above background technology.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A twin-screw extruder air drying device includes an outer frame barrel, a hot air drying device, and a guide structure. A support roller is rotatably mounted inside the outer frame barrel via a shaft, and the hot air drying device is fixedly mounted on the top of the outer frame barrel.

[0009] The guide structure includes a bottom guide roller and an upper guide roller. Bottom mounting plates are rotatably provided on both sides of the bottom guide roller. The bottom mounting plates are fixedly connected to the outer frame tube through two bottom bolts.

[0010] Both sides of the upper guide roller are rotatably connected to the upper mounting plate, the upper mounting plate is fixedly connected to the outer frame tube through a single upper bolt, and the bottom end of the upper mounting plate is matched with the upper end of the bottom mounting plate;

[0011] The top ends of the two upper mounting plates are jointly provided with an air guide structure.

[0012] Furthermore, the hot air drying equipment includes a hot air tube and a fan guide. The hot air tube is fixedly installed at the top of the outer frame tube, and the air outlet of the hot air tube corresponds to the air guide structure. The fan guide is fixedly installed at one end of the hot air tube away from the air guide structure. An adjustment component is provided inside the hot air tube near the air outlet.

[0013] Furthermore, the adjustment component includes a rotating shaft, which is fixedly installed inside the hot air cylinder and rotatably connected to the hot air cylinder. An extension plate is fixedly connected to the outer peripheral side of the rotating shaft, and an electric push rod connected to the bottom wall of the hot air cylinder is provided at the bottom end of the extension plate.

[0014] Furthermore, the air guide structure includes an air guide plate and two plywood plates, which are respectively installed on the top ends of the two upper mounting plates and fixedly connected to the upper mounting plates by plywood bolts. The adjacent sides of the two plywood plates are both tightly attached to the outer wall of the outer frame tube, and the inner side of the air guide plate is arc-shaped.

[0015] Furthermore, the bottom guide roller and the upper guide roller are both made of rubber and are provided with a plurality of weight-reducing holes inside, and the diameter of the weight-reducing holes inside the upper guide roller is smaller than the diameter of the weight-reducing holes of the bottom guide roller.

[0016] Furthermore, a lower through groove is provided at the bottom end of the outer frame tube, and a rectangular frame is fixedly connected to the interior of the lower through groove, and a plurality of transverse heat dissipation plates are provided on the inner wall of the rectangular frame.

[0017] In summary, the present invention has at least one of the following beneficial technical effects:

[0018] 1. This air drying device for a twin-screw extruder heats the outside air through a hot air drying device and blows it into the outer frame barrel when the material is inside the outer frame barrel, forming a dry inner cavity with a certain temperature inside the outer frame barrel, thereby effectively drying the moisture on the surface of the material. Compared with the existing technology, it can prevent the material from being affected by the external temperature and air flow during drying, thereby achieving the purpose of improving the drying efficiency and drying effect;

[0019] 2. In this air-drying device for a twin-screw extruder, when the bottom guide roller and the upper guide roller are in contact with each other and have a certain pressure, the deformation of the bottom guide roller will be greater than the deformation of the upper guide roller, so that the contact surface between the bottom guide roller and the upper wire roller forms an inwardly concave arc surface. At this time, when the strip material extruded by the extruder is inserted between the upper guide roller and the bottom guide roller, the material will be lifted up, so that the material can be moved to the top of the support roller, so as to facilitate the guidance of the material, effectively improve the stability of the material when being blown, and prevent the material from shaking and causing breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural schematic diagram of an air drying device for a twin-screw extruder of the present utility model.

[0022] Figure 2 This is a schematic diagram of the internal structure of an outer frame barrel of an air-drying device for a twin-screw extruder according to the utility model.

[0023] Figure 3 This is an exploded view of the guide structure of a twin-screw extruder air drying device of the utility model

[0024] Figure 4 This is a structural schematic diagram of a guide structure of an air-drying device for a twin-screw extruder according to the present invention.

[0025] Figure 5 This is a schematic structural diagram of an air guide structure and hot air drying equipment for an air drying device for a twin-screw extruder of the utility model.

[0026] Figure 6 This utility model is a twin-screw extruder air drying device Figure 5 A magnified view of the structure at point A.

[0027] Figure 7 The utility model is a schematic planar structural diagram of an upper guide roller and a bottom guide roller of an air-drying device for a twin-screw extruder.

[0028] In the figure, 1. outer frame tube; 2. hot air drying equipment; 21. hot air cylinder; 22. guide fan; 23. adjustment component; 231. rotating shaft; 232. extension plate; 233. electric push rod; 3. guide structure; 31. bottom guide roller; 32. upper guide roller; 33. bottom mounting plate; 34. upper mounting plate; 35. weight reduction hole; 4. support roller; 5. air guide structure; 51. air guide plate; 52. splint; 6. lower through groove; 7. rectangular frame; 8. horizontal heat dissipation plate. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below with reference to the accompanying drawings. Example

[0030] Reference Figure 1 - Figure 7 The utility model discloses an air drying device for a twin-screw extruder, comprising an outer frame barrel 1, a hot air drying device 2 and a guide structure 3. A support roller 4 is installed inside the outer frame barrel 1 through a shaft, and the hot air drying device 2 is fixedly installed on the top of the outer frame barrel 1;

[0031] The guide structure 3 includes a bottom guide roller 31 and an upper guide roller 32. Bottom mounting plates 33 are rotatably provided on both sides of the bottom guide roller 31. The bottom mounting plates 33 are fixedly connected to the outer frame tube 1 through two bottom bolts.

[0032] Both sides of the upper guide roller 32 are rotatably connected to the upper mounting plate 34, and the upper mounting plate 34 is fixedly connected to the outer frame tube 1 through a single upper bolt. Figure 3 As shown, the bottom end of the upper mounting plate 34 cooperates with the upper end of the bottom mounting plate 33;

[0033] The top ends of the two upper mounting plates 34 are commonly provided with an air guide structure 5 .

[0034] In this embodiment, when the equipment is in use, the outer frame tube 1 is mounted on the upper end of the extruder cooling unit, and the cooled material is inserted between the bottom guide roller 31 and the upper guide roller 32. The extruded material is guided by the rotation of the bottom guide roller 31 and the upper guide roller 32, so that the material passes through the outer frame tube 1.

[0035] When the material is inside the outer frame tube 1, the hot air drying device 2 heats the outside air and blows it into the outer frame tube 1, so that a dry inner cavity with a certain temperature is formed in the outer frame tube 1, thereby effectively drying the moisture on the surface of the material. Compared with the existing technology, the material can be prevented from being affected by the external temperature and air flow during drying, thereby achieving the purpose of improving the drying efficiency and drying effect;

[0036] like Figure 4 and Figure 7 As shown, when the upper mounting plate 34 is mounted on the upper end of the bottom mounting roller, the outer peripheral walls of the upper guide roller 32 and the bottom guide roller 31 are in contact with each other, and the axial center line of the support roller 4 is located below the contact surface between the upper guide roller 32 and the bottom guide roller 31.

[0037] In a further preferred embodiment of the present invention, Figure 5 As shown, the hot air drying equipment 2 includes a hot air cylinder 21 and a fan 22. The hot air cylinder 21 is fixedly installed at the top of the outer frame cylinder 1, and the air outlet of the hot air cylinder 21 corresponds to the air guide structure 5. The fan 22 is fixedly installed at one end of the hot air cylinder 21 away from the air guide structure 5. An adjustment component 23 is provided inside the hot air cylinder 21 near the air outlet.

[0038] In this embodiment, the external air is sucked into the interior of the hot air cylinder 21 by the ducting fan 22, and the hot air cylinder 21 heats the air so that the air has a certain temperature, thereby achieving the purpose of improving the air drying efficiency.

[0039] In a further preferred embodiment of the present invention, Figure 5 、 6 As shown, the adjustment component 23 includes a rotating shaft 231, which is fixedly installed inside the hot air cylinder 21 and is rotatably connected to the hot air cylinder 21. The outer peripheral side of the rotating shaft 231 is fixedly connected to an extension plate 232, and the bottom end of the extension plate 232 is provided with an electric push rod 233 connected to the bottom wall of the hot air cylinder 21.

[0040] In this embodiment, the extension plate 232 is rotatably mounted inside the heat duct by the setting of the rotating shaft 231, and the angle between the extension plate 232 and the ground of the heat duct 21 can be controlled in real time by the setting of the electric push rod 233.

[0041] When the hot air is discharged through the air outlet of the hot air cylinder 21, the angle of the extension plate 232 is controlled to adjust the size of the air outlet and thus adjust the speed of air discharge;

[0042] Specifically, when the speed at which the ducting fan 22 pushes the air to flow remains unchanged, the smaller the size of the exhaust port, the faster the flow rate of the air when it is discharged, thereby increasing the air pressure and further improving the drying efficiency.

[0043] In a further preferred embodiment of the present invention, Figure 5 As shown, the air guide structure 5 includes an air guide plate 51 and two plywood 52. The two plywood 52 are respectively installed on the top ends of the two upper mounting plates 34 and are fixedly connected to the upper mounting plates 34 through the plywood 52 bolts. The adjacent sides of the two plywood 52 are tightly attached to the outer wall of the outer frame tube 1, and the inner side of the air guide plate 51 is arc-shaped.

[0044] In this embodiment, the air guide plate 51 is fixed to the top of the upper mounting plate 34 by two clamping plates 52 and bolts of the clamping plates 52;

[0045] Since the inner side of the air guide piece 51 is arranged in an arc shape, Figure 5 As shown, the air can be effectively guided so that the air fully enters the outer frame tube 1 to achieve the purpose of drying the material inside the outer frame tube 1.

[0046] In a further preferred embodiment of the present invention, Figure 7 As shown, the bottom guide roller 31 and the upper guide roller 32 are both made of rubber and are provided with a plurality of weight-reducing holes 35 inside. The diameter of the weight-reducing holes 35 inside the upper guide roller 32 is smaller than the diameter of the weight-reducing holes 35 of the bottom guide roller 31.

[0047] In this embodiment, the provision of the weight-reducing holes 35 can effectively reduce the pressure on the material when the upper guide roller 32 and the bottom guide roller 31 clamp the material, and increase the friction between the material and the material, so that the material can be moved by the rotation of the upper guide roller 32.

[0048] On the other hand, since the diameter of the weight-reducing hole 35 inside the upper guide roller 32 is smaller than the diameter of the weight-reducing hole 35 of the bottom guide roller 31, and the diameters of the upper guide roller 32 and the bottom guide roller 31 are equal, the wall thickness of the bottom guide roller 31 is smaller than that of the upper guide roller 32. Therefore, when the bottom guide roller 31 and the upper guide roller 32 contact each other and have a certain pressure, the deformation of the bottom guide roller 31 will be greater than the deformation of the upper guide roller 32, as shown in FIG. Figure 7 As shown;

[0049] When the strip material extruded by the extruder is inserted between the upper guide roller 32 and the bottom guide roller 31, the material will be tilted upward, so that the material can be moved above the support roller 4, thereby facilitating the guidance of the material. It can effectively improve the stability of the material when it is blown and prevent the material from shaking and causing breakage.

[0050] In a further preferred embodiment of the present invention, Figure 2As shown, a lower through groove 6 is provided at the bottom end of the outer frame tube 1 , and a rectangular frame 7 is fixedly connected to the interior of the lower through groove 6 , and a plurality of horizontal heat dissipation plates 8 are provided on the inner wall of the rectangular frame 7 .

[0051] In this embodiment, through the setting of the lower through groove 6 and the rectangular frame 7, after the hot air enters the outer frame tube 1 to dry the material, it can be discharged through the rectangular frame 7, and through the setting of the heat dissipation plate, the overall temperature of the equipment is reduced to prevent the problem of the material softening again due to excessive temperature.

[0052] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. An air drying device for a twin-screw extruder, characterized in that: It comprises an outer frame tube (1), a hot air drying device (2) and a guide structure (3); a support roller (4) is rotatably mounted inside the outer frame tube (1) via a shaft, and the hot air drying device (2) is fixedly mounted on the top of the outer frame tube (1); The guide structure (3) includes a bottom guide roller (31) and an upper guide roller (32), and bottom mounting plates (33) are rotatably provided on both sides of the bottom guide roller (31), and the bottom mounting plates (33) are fixedly connected to the outer frame tube (1) via two bottom bolts; Both sides of the upper guide roller (32) are rotatably connected to an upper mounting plate (34), the upper mounting plate (34) is fixedly connected to the outer frame tube (1) via a single upper bolt, and the bottom end of the upper mounting plate (34) is matched with the upper end of the bottom mounting plate (33); The top ends of the two upper mounting plates (34) are jointly provided with an air guide structure (5).

2. The air drying device for a twin-screw extruder according to claim 1, characterized in that: The hot air drying device (2) comprises a hot air cylinder (21) and a ventilating fan (22), wherein the hot air cylinder (21) is fixedly mounted on the top end of the outer frame cylinder (1), and the air outlet of the hot air cylinder (21) corresponds to the air guide structure (5), and the ventilating fan (22) is fixedly mounted on one end of the hot air cylinder (21) away from the air guide structure (5), and an adjusting component (23) is provided inside the hot air cylinder (21) near the air outlet.

3. An air drying device for a twin-screw extruder according to claim 2, characterized in that: The adjustment assembly (23) includes a rotating shaft (231), which is fixedly installed inside the hot air cylinder (21) and is rotatably connected to the hot air cylinder (21). An extension plate (232) is fixedly connected to the outer peripheral side of the rotating shaft (231), and an electric push rod (233) connected to the bottom wall of the hot air cylinder (21) is provided at the bottom end of the extension plate (232).

4. An air drying device for a twin-screw extruder according to claim 3, characterized in that: The air guide structure (5) comprises an air guide plate (51) and two clamping plates (52). The two clamping plates (52) are respectively mounted on the top ends of the two upper mounting plates (34) and fixedly connected to the upper mounting plates (34) via clamping plate (52) bolts. The adjacent sides of the two clamping plates (52) are both tightly attached to the outer wall of the outer frame tube (1), and the inner side of the air guide plate (51) is arranged in an arc shape.

5. The air drying device for a twin-screw extruder according to claim 4, characterized in that: The bottom guide roller (31) and the upper guide roller (32) are both made of rubber and are provided with a plurality of weight-reducing holes (35) inside. The diameter of the weight-reducing holes (35) inside the upper guide roller (32) is smaller than the diameter of the weight-reducing holes (35) in the bottom guide roller (31).

6. An air drying device for a twin-screw extruder according to claim 5, characterized in that: A lower through groove (6) is provided at the bottom end of the outer frame tube (1), and a rectangular frame (7) is fixedly connected to the interior of the lower through groove (6), and a plurality of transverse heat dissipation plates (8) are provided on the inner wall of the rectangular frame (7).

Images