A circulating hot air drying device for plastic extruder

Abstract

The utility model relates to the technical field of plastic extruder, concretely is a kind of circulating hot air drying device for plastic extruder, including drying cabinet, the top of drying cabinet is provided with feed inlet, the bottom of drying cabinet is provided with discharge gate, the inside of drying cabinet is provided with several groups of inclined plate.The utility model can make the plastic particles that input inside drying cabinet fall down by layer sliding in the inside of drying cabinet by the setting of several groups of inclined plate, the setting of air duct, air inlet pipe, air outlet pipe, motor, fan, electric heating wire and other structures can form the circulating hot air flow between drying cabinet and air duct, so that the hot air flowing through drying cabinet is dried to the plastic particles in the inside of drying cabinet, and the moisture in hot air is absorbed by spunlace nonwoven fabric when hot air passes through air duct, so as to ensure the drying effect, since hot air is not easy to lose heat to the outside in the process of circulating flow to dry plastic particles, effectively improve the utilization of hot air, and then reduce the consumption of energy.

Description

Technical Field

[0001] This utility model relates to the field of plastic extruder technology, and more specifically, to a circulating hot air drying device for a plastic extruder. Background Technology

[0002] The plastic extruder is the "main machine" of plastic extrusion molding equipment. It is responsible for heating and melting solid plastic raw materials, plasticizing them through the screw extrusion system, and pushing them to the mold for forming. During the operation of the plastic extruder, in order to prevent the residual moisture on the plastic granules fed into the extruder from affecting the quality of the extruded plastic, a dryer is usually required to dry the plastic granules fed into the extruder inlet.

[0003] However, the hot air generated by existing dryers carries away the moisture produced during the drying process and is promptly discharged to the outside through the exhaust vent, preventing the hot air from circulating. This results in low utilization of the hot air and requires a significant amount of energy. Utility Model Content

[0004] This invention provides a circulating hot air drying device for plastic extruders, which solves the technical problem in the prior art where the hot air generated by the dryer carries away the moisture produced during the drying process and is promptly discharged to the outside through the exhaust port, resulting in the inability of the hot air to circulate, thus leading to low utilization of the hot air and the consumption of a large amount of energy.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A circulating hot air drying device for a plastic extruder includes a drying chamber with a feed inlet at the top and a discharge outlet at the bottom. The drying chamber contains several sets of inclined plates arranged in a staggered, multi-layered manner. The device also includes an air duct with an inlet pipe and an outlet pipe at both ends, connected to both sides of the drying chamber. A motor is mounted on one end of the outer side of the air duct, with one end of the motor's output shaft extending into the air duct and connected to a fan. A heating wire is installed inside the inlet pipe, and several sets of spunlace nonwoven fabric are arranged inside the air duct.

[0007] Furthermore, a set of air distribution pipes is connected between the air inlet pipe and the drying chamber. The air inlet of the air distribution pipe is connected to the air inlet pipe, and several sets of air outlets of the air distribution pipe are vertically distributed and extend into the interior of the drying chamber.

[0008] Furthermore, the top of the air duct is provided with a notch, and the two sides of the notch are provided with sliding grooves. A fixed frame is slidably connected inside the sliding grooves, and the spunlace nonwoven fabric is disposed inside the fixed frame.

[0009] Furthermore, the surface of the inclined plate is evenly distributed with through holes, and the diameter of the through holes is smaller than the particle size of the plastic particles put into the drying box. A baffle is provided inside the drying box on the side near the air outlet pipe.

[0010] Furthermore, a temperature sensor is installed inside the drying oven.

[0011] Furthermore, a cover plate is provided at the top of the feed inlet, and a solenoid valve is installed on the discharge outlet.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the arrangement of several sets of inclined plates allows the plastic granules placed inside the drying chamber to slide down layer by layer inside the drying chamber. The arrangement of structures such as air ducts, air inlet pipes, air outlet pipes, motors, fans, and heating wires can form a circulating hot air flow between the drying chamber and the air ducts, so that the hot air flowing through the drying chamber dries the plastic granules inside the drying chamber. Moreover, when the hot air passes through the air duct, the spunlace nonwoven fabric can absorb the moisture in the hot air, thereby ensuring the drying effect. Since the hot air does not easily lose heat to the outside during the drying process of the plastic granules in circulation, the utilization rate of the hot air is effectively improved, thereby reducing energy consumption. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a front structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of the drying oven in this utility model;

[0017] Figure 4 This is a schematic diagram of the fan and heating wire in this utility model;

[0018] Figure 5 This is a schematic diagram showing the disassembled structure of the fixed frame and the air duct in this utility model.

[0019] In the diagram: 1. Drying oven; 2. Feed inlet; 3. Discharge outlet; 4. Inclined plate; 5. Air duct; 6. Air inlet pipe; 7. Air outlet pipe; 8. Motor; 9. Fan; 10. Heating wire; 11. Spunlace nonwoven fabric; 12. Air distribution pipe; 13. Notch; 14. Fixing frame; 15. Slide groove; 16. Through hole; 17. Solenoid valve; 18. Cover plate; 19. Barrier net. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-5A circulating hot air drying device for a plastic extruder includes a drying chamber 1. The top of the drying chamber 1 has a feed inlet 2, and the bottom of the drying chamber 1 has a discharge outlet 3. The interior of the drying chamber 1 is equipped with several sets of inclined plates 4, arranged in a multi-layered, staggered pattern. When plastic granules, as raw material, are fed into the drying chamber 1 through the feed inlet at the top, the granules slide down the inclined plates 4 sequentially. When the granules reach the bottom of the drying chamber 1, they slide out through the discharge outlet 3. The device also includes an air duct 5, with an air inlet pipe 6 and an air outlet pipe 7 at both ends. The air inlet pipe 6 and the air outlet pipe 7 are connected to both sides of the drying chamber 1. A motor 8 is installed at one end of the outer side of the air duct 5. One end of the output shaft of the motor 8 extends into the air duct 5 and is connected to a fan 9. The fan 9 faces the air inlet pipe 6. An electric heating wire 10 is installed inside the air inlet pipe 6. After the motor 8 starts, the output shaft of the motor 8 drives the fan 9 to rotate. The rotating fan 9 generates airflow that blows into the air inlet duct 6. When the airflow passes through the heating wire 10 inside the air inlet duct 6, it blows the heat generated on the heating wire 10 into the drying chamber 1 to form hot air. After passing through the interior of the drying chamber 1, the hot air flows out from the air outlet duct 7 and returns to the interior of the air duct 5 through the air outlet duct 7, thus realizing the circulation of hot air between the drying chamber 1 and the air duct 5. When the hot air passes through the interior of the drying chamber 1, it can dry the plastic particles sliding on the inclined plate 4 inside the drying chamber 1, so that the plastic particles gradually dry while sliding on the inclined plate 4. The moisture generated during drying will flow from the drying chamber 1 into the air duct 5 with the airflow. The interior of the air duct 5 is provided with several sets of spunlace nonwoven fabric 11. The spunlace nonwoven fabric 11 has the characteristics of high water absorption and good air permeability. When the airflow passes through the air duct 5, the several sets of spunlace nonwoven fabric 11 will absorb the moisture in the airflow, so that the airflow becomes dry and then enters the interior of the drying chamber 1 again through the air inlet duct 6.

[0023] During operation, the discharge port 3 at the bottom of the drying chamber 1 is connected to the feeding port of the plastic extruder. During processing, plastic granules, used as raw materials, are fed into the drying chamber 1 through the feed port 2 at the top. The granules then slide downwards layer by layer along several sets of inclined plates 4 inside the drying chamber 1, thus extending their residence time inside. During this process, starting the motor 8 at one end of the air duct 5 drives the fan 9 to rotate. The rotating fan 9 generates airflow that blows into the air inlet pipe 6. After passing through the heating wire 10 inside the air inlet pipe 6, the airflow forms hot air that is blown into the drying chamber 1 and returns to the air duct 5 through the air outlet pipe 7. This achieves the efficient exchange of hot air between the drying chamber 1 and the air duct 5. The hot air circulates between the drying chamber 1 and the drying chamber 2. When the hot air passes through the interior of the drying chamber 1, it dries the plastic granules that slide down the inclined plate 4 layer by layer. After being effectively dried, the plastic granules can enter the plastic extruder through the discharge port 3 at the bottom of the drying chamber 1. The moisture generated during the drying process will flow with the hot air into the interior of the air duct 5. The spunlace nonwoven fabric 11 inside the air duct 5 absorbs the moisture in the hot air, so that the dried airflow flows back into the drying chamber 1. This will not affect the drying effect of the plastic granules that are subsequently fed into the drying chamber 1. Furthermore, because the hot air circulates between the air duct 5 and the drying chamber 1, it is not easy to lose it to the outside environment, which effectively improves the utilization rate of the hot air and reduces energy consumption.

[0024] For further details, please refer to Figure 1-5 A set of air distribution pipes 12 is connected between the air inlet pipe 6 and the drying chamber 1. The air inlet of the air distribution pipe 12 is connected to the air inlet pipe 6. Several sets of air outlets of the air distribution pipe 12 are vertically distributed and extend into the interior of the drying chamber 1. The air distribution pipe 12 can divide the hot air in the air inlet pipe 6 into multiple streams and blow them into the interior of the drying chamber 1 from the air outlets, so that the hot air inside the drying chamber 1 is distributed more evenly, thereby drying the plastic particles in the drying chamber 1 evenly and ensuring the drying effect.

[0025] For further details, please refer to Figure 1-5The top of the air duct 5 is provided with a notch 13, and the two sides of the notch 13 are provided with grooves 15. A fixed frame 14 is slidably connected inside the grooves 15. The spunlace nonwoven fabric 11 is set inside the fixed frame 14. After the fixed frame 14 is aligned with the notch 13 at the top of the air duct 5 and inserted, the edge of the fixed frame 14 will fit with the groove 15 and slide down along the groove 15. When the fixed frame 14 is inserted to the bottom of the air duct 5, the edge of the fixed frame 14 can seal the notch 13 at the top of the air duct 5. At this time, the spunlace nonwoven fabric 11 on the fixed frame 14 will be located inside the air duct 5 and absorb the moisture in the hot air flowing through the air duct 5. When the fixed frame 14 is pulled upward, it can slide upward along the groove 15 and then pull the fixed frame 14 to the outside of the air duct 5. At this time, the saturated spunlace nonwoven fabric 11 can be replaced to ensure the absorption effect of moisture in the hot air.

[0026] For further details, please refer to Figure 1-5 The surface of the inclined plate 4 is evenly distributed with through holes 16, which allow hot air blown into the drying chamber 1 to pass through the inclined plate 4, thereby reducing the obstruction of the hot air inside the drying chamber 1. This allows the hot air to flow more smoothly through the drying chamber 1 and fully contact the plastic particles sliding on the inclined plate 4. The diameter of the through holes 16 is smaller than the particle size of the plastic particles put into the drying chamber 1, so the plastic particles will not fall through the through holes 16 when sliding on the inclined plate 4. A baffle 19 is provided on the side of the drying chamber 1 near the air outlet 7 to prevent the plastic particles from being blown into the air outlet 7 with the airflow.

[0027] For further details, please refer to Figure 1-5 The drying oven 1 is equipped with a temperature sensor, which is connected to a controller for controlling the opening and closing of the heating wire 10. The temperature sensor can monitor the temperature of the hot air passing through the drying oven 1 and transmit the monitored temperature data to the controller. When the monitored temperature is lower than the preset value, the controller controls the heating wire 10 to turn on and heat the hot air circulating through the drying oven 1. When the monitored temperature is higher than the preset value, the controller controls the heating wire 10 to turn off, thereby stopping the heating of the hot air circulating through the drying oven 1. This ensures that the temperature of the hot air passing through the drying oven 1 remains constant and further reduces energy consumption.

[0028] For further details, please refer to Figure 1-5 The top of the feed inlet 2 is equipped with a cover plate 18, which is used to seal the feed inlet 2 after feeding to prevent hot air from leaking out to the outside through the feed inlet 2. The discharge port 3 is equipped with a solenoid valve 17. When drying the raw materials fed into the drying chamber 1, closing the solenoid valve 17 can prevent hot air from flowing into the extruder through the notch 13. After drying, the solenoid valve 17 can be opened to allow plastic particles to enter the extruder through the discharge port 3.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circulating hot air drying device for a plastic extruder, comprising a drying chamber (1), wherein a feed inlet (2) is provided at the top of the drying chamber (1), and a discharge outlet (3) is provided at the bottom of the drying chamber (1), characterized in that, The drying oven (1) is equipped with several sets of inclined plates (4), which are arranged in multiple layers in the drying oven (1). The device also includes a set of air ducts (5), with air inlet pipes (6) and air outlet pipes (7) at both ends of the air ducts (5). The air inlet pipes (6) and the air outlet pipes (7) are respectively connected to the two sides of the drying oven (1). A motor (8) is installed at one end of the outer side of the air ducts (5). One end of the output shaft of the motor (8) extends into the air ducts (5) and is connected to a fan (9). A heating wire (10) is installed inside the air inlet pipe (6). Several sets of spunlace nonwoven fabric (11) are arranged inside the air ducts (5).

2. The circulating hot air drying device for a plastic extruder according to claim 1, characterized in that, A set of air distribution pipes (12) is connected between the air inlet pipe (6) and the drying box (1). The air inlet of the air distribution pipe (12) is connected to the air inlet pipe (6). Several sets of air outlets of the air distribution pipe (12) are vertically distributed and extend into the interior of the drying box (1).

3. The circulating hot air drying device for a plastic extruder according to claim 1, characterized in that, The top of the air duct (5) is provided with a notch (13), and the two sides of the notch (13) are provided with grooves (15). A fixed frame (14) is slidably connected inside the groove (15), and the spunlace nonwoven fabric (11) is provided inside the fixed frame (14).

4. The circulating hot air drying device for a plastic extruder according to claim 1, characterized in that, The inclined plate (4) has through holes (16) evenly distributed on its surface, and the diameter of the through holes (16) is smaller than the particle size of the plastic particles put into the drying box (1). A baffle (19) is provided inside the drying box (1) on the side near the air outlet pipe (7).

5. The circulating hot air drying device for a plastic extruder according to claim 1, characterized in that, A temperature sensor is installed inside the drying oven (1).

6. The circulating hot air drying device for a plastic extruder according to claim 1, characterized in that, The top of the feed inlet (2) is provided with a cover plate (18), and the top of the discharge outlet (3) is provided with a solenoid valve (17).

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