Raw material conveying device for extrusion molding of thermoplastic polyurethane elastomer

Abstract

The invention relates to the technical field of raw material conveying, in particular to a raw material conveying device for thermoplastic polyurethane elastomer extrusion molding. The device comprises a main flow guide plate, an auxiliary flow guide plate, a coarse material chamber and a fine material chamber. According to the device, the main flow guide plate is arranged for area division, and when raw materials are conveyed, particles of different sizes in the raw material particles are separated through heat flow discharged from the inner end of the exhaust head and guided to the corresponding areas divided by the main flow guide plate; and meanwhile, the main flow guide plate is matched with the auxiliary flow guide plate to guide heat flow discharged from the inner end of the air supply assembly to different areas of the inner end of the batching equipment, the drying work of raw material particles of different sizes is adapted through the released heat and the drying time, adaptive drying treatment is conducted, and the drying effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of raw material conveying, in particular to a raw material conveying device for extrusion molding of thermoplastic polyurethane elastomer. Background Art

[0002] Thermoplastic polyurethane (TPU) is a thermoplastic elastomer. Due to its excellent elasticity, toughness, and various mechanical strengths, it is widely used in processing methods such as injection, extrusion, calendaring, and dissolution into solution-based resins. It is a plastic material frequently used by plastics processors, and its products cover a range of industrial applications and civilian necessities.

[0003] In the process of processing and molding thermoplastic polyurethane elastomer, the raw material particles are mainly placed in an extruder and extrusion molding is performed using the extruder. Since thermoplastic polyurethane is a hygroscopic material, it is easy to absorb moisture when exposed to the air, resulting in excessively high internal moisture content, affecting the subsequent extrusion molding effect. Therefore, the traditional processing method requires the raw material particles to be dried before extrusion, and then introduced into the guide hopper for extrusion. However, contact with air cannot be avoided during the guiding process, and there is also air at the inner end of the guide chamber, so moisture absorption will still occur. At the same time, due to the different sizes of the raw material particles, the corresponding moisture absorption effects are different, so it is too difficult to simultaneously control the drying state of coarse and fine particles during drying.

[0004] In order to address the above problems, a separate dry raw material conveying device for thermoplastic polyurethane elastomer extrusion molding is urgently needed. Summary of the Invention

[0005] The object of the present invention is to provide a raw material conveying device for thermoplastic polyurethane elastomer extrusion molding, which is divided into areas by a main guide plate. During raw material conveying, the heat flow discharged from the inner end of the exhaust head is used to separate particles of different sizes in the raw material particles and guide them to the corresponding areas divided by the main guide plate. At the same time, the main guide plate cooperates with the auxiliary guide plate to guide the heat flow discharged from the inner end of the air supply component to different areas of the inner end of the batching equipment. The amount of heat released and the length of drying time are used to adapt to the drying work of raw material particles of different sizes, so as to solve the problems raised in the above-mentioned background technology, namely: The different sizes of raw material particles have different corresponding moisture absorption effects, so it is too difficult to simultaneously control the drying state of coarse and fine particles during drying.

[0006] To achieve the above-mentioned purpose, a raw material conveying device for thermoplastic polyurethane elastomer extrusion molding is provided, including an extrusion table, an extrusion bin and an extrusion component. A discharge hopper is provided at the top of the extrusion bin, a partition plate is provided at the inner end of the discharge hopper, and a batching device is provided at the top of the discharge hopper. The batching equipment includes a batching bin and a raw material bin that is connected to the top of the batching bin. The raw material particles are transported to the inner end of the extrusion bin for extrusion processing using the batching bin, the raw material bin and the discharge hopper.

[0007] At the same time, in order to cope with the problem of different sizes of raw material particles, this solution divides the inner end of the batching equipment into a coarse material chamber and a fine material chamber by setting a main guide plate, and the bottom opening of the raw material bin is opposite to the top opening of the coarse material chamber. Therefore, without external force, the raw material particles falling from the inner end of the raw material bin will flow into the inner end of the coarse material chamber along the direction of their gravity. Therefore, the exhaust head is used to discharge the hot flow flowing at the inner end of the auxiliary guide plate outward, and blow it to the raw material particles discharged from the bottom opening of the raw material bin. The power generated by the airflow is used to blow the fine particles in the raw material particles away from the initial falling path, follow the hot flow to the top opening of the main guide plate, and fall from top to bottom along the top opening along the inner end of the fine material chamber. The large particles remaining on the initial path will fall downward along the initial path to the coarse material chamber because their gravity overcomes the power generated by the heat flow, and fall from top to bottom along the inner end of the coarse material chamber, thereby realizing automatic material sorting and processing.

[0008] Furthermore, the heat generated by the heat flow continuously flowing through the inner end of the auxiliary guide plate and the main guide plate will act on the corresponding area, wherein the heat released by the heat flow flowing through the inner end of the main guide plate will diffuse to both sides, namely the inner ends of the coarse material chamber and the fine material chamber, to dry the fallen fine particles and perform a primary drying treatment on the fallen coarse particles, while the heat released by the heat flow flowing along the inner end of the auxiliary guide plate will diffuse to the inner end of the coarse material chamber, to perform a secondary drying treatment on the fallen coarse particles, thereby performing adaptive drying treatment according to the different water content of the coarse and fine particles, thereby improving the drying effect.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In the raw material conveying device for extrusion molding of thermoplastic polyurethane elastomer, the area is divided by the main guide plate. When conveying the raw materials, the heat flow discharged from the inner end of the exhaust head is used to separate the particles of different sizes in the raw material particles and guide them to the corresponding areas divided by the main guide plate. At the same time, the main guide plate cooperates with the auxiliary guide plate to guide the heat flow discharged from the inner end of the air supply component to different areas of the inner end of the batching equipment. The amount of heat released and the length of drying time are used to adapt to the drying work of raw material particles of different sizes, perform adaptive drying treatment, and improve the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic plan view of the connection between the batching equipment and the extrusion bin of the present invention; Figure 3 It is a planar cross-sectional view of the batching equipment of the present invention; Figure 4 For the present invention Figure 3 A local enlarged view of point A; Figure 5 This is a schematic diagram of the coarse and fine raw material separation process of the present invention; Figure 6 Schematic diagram of heat flow of the present invention.

[0011] The meaning of each number in the figure is: 10. Extrusion table; 110. Extrusion chamber; 120. Extrusion assembly; 130. Discharge hopper; 131. Dividing plate; 140. Air supply pump; 141. Air supply pipe; 20. Batching equipment; 210. Batching bin; 210A. Coarse material chamber; 210B. Fine material chamber; 220. Raw material bin; 230. Main guide plate; 231. Main guide hopper; 232. Connecting pipe; 240. Auxiliary guide plate; 241. Auxiliary guide hopper; 242. Guide groove; 243. Exhaust head; 244. Filter; 250. Rotating rod; 251. Sleeve; 252. Extrusion plate; 260. Internal adjustment plate. DETAILED DESCRIPTION

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0013] See also Figure 1 As shown, a raw material conveying device for thermoplastic polyurethane elastomer extrusion molding is provided, including an extrusion table 10, an extrusion bin 110 and an extrusion assembly 120. A discharge hopper 130 is provided at the top of the extrusion bin 110, a partition plate 131 is provided at the inner end of the discharge hopper 130, and a batching device 20 is provided at the top of the discharge hopper 130. The batching device 20 includes a batching bin 210 and a raw material bin 220 that is connected to the top of the batching bin 210. A main diverter 230 is provided in the middle of the batching bin 210. The main diverter 230 is used to divide the inner end of the batching bin 210 into a coarse material chamber 210A and a fine material chamber 210B. The top of the main deflector plate 230 is connected to an air supply assembly, which generates a heat flow from top to bottom at its inner end. The bottom end of the main deflector plate 230 is connected to the bottom end of the auxiliary deflector plate 240, and the heat flow from the inner end of the main deflector plate 230 is introduced into the inner end of the auxiliary deflector plate 240, thereby generating a heat flow from bottom to top at its inner end. The bottom end of the raw material bin 220 is opposite to the inner end of the coarse material chamber 210A, and the raw materials at the inner end of the raw material bin 220 are discharged into the inner end of the coarse material chamber 210A by gravity. The top end of the auxiliary guide plate 240 is in a conductive state, and the opening is aligned with the raw material flow path. The discharged airflow is used to separate the fallen raw materials, and the fine materials follow the airflow and are discharged into the fine material chamber 210B, and are dried by the heat flow flowing at the inner end of the main guide plate 230. The coarse materials maintain the initial flow path and are discharged into the coarse material chamber 210A, and are circulated and dried by the heat flow at the inner end of the main guide plate 230 and the inner end of the auxiliary guide plate 240.

[0014] The specific contents are as follows: During the extrusion molding process, the raw material particles are first placed in the inner end of the raw material bin 220. Figure 3 As shown, the bottom opening of the raw material bin 220 is opposite to the top opening of the coarse material chamber 210A. Therefore, without external force, the raw material particles falling from the inner end of the raw material bin 220 will flow into the inner end of the coarse material chamber 210A along the direction of gravity. However, since there are various particles of different sizes in the raw material particles, these particles have different sizes. When they come into contact with the air, the water content of the air they adsorb will be different. Therefore, when drying, Figure 2 As shown, the air supply pump 140 is used to provide heat flow to the air supply pipe 141, as shown in FIG. Figure 3 As shown, since the air supply pipe 141 is connected to the top of the main deflector plate 230, and the top of the inner end of the main deflector plate 230 is provided with a main deflector 231, and the top of the main deflector 231 is connected to the pipe opening of the air supply pipe 141, the heat flow into the inner end of the air supply pipe 141 will be discharged to the inner end of the main deflector plate 230. Figure 5 As shown, a heat flow flowing from top to bottom is generated. Since the main deflector 230 is located in the middle of the inner end of the batching equipment 20 and divides the inner end of the batching equipment 20 into the coarse material chamber 210A and the fine material chamber 210B, the heat flow flowing at the inner end of the main deflector 230 will provide heat to the inner ends of the coarse material chamber 210A and the fine material chamber 210B. A secondary deflector 241 is provided at the bottom of the inner end of the secondary deflector 240. A connecting pipe 232 is connected between the bottom end of the secondary deflector 241 and the bottom end of the main deflector 230. The flowing heat flow passes through the main deflector 230 and flows to the inner end of the secondary deflector 240, generating a heat flow flowing from bottom to top at the inner end of the secondary deflector 240. The secondary deflector 240 is located on one side of the inner end of the coarse material chamber 210A. Therefore, the heat released by the heat flow flowing at the inner end of the secondary deflector 240 will only be released to the inner end of the coarse material chamber 210A. Further, such as Figure 3-Figure 4 As shown, a guide groove 242 is provided at the top of the auxiliary guide plate 240, and an exhaust head 243 is provided at the top of the guide groove 242 to communicate with the guide groove, and the end opening of the exhaust head 243 faces the area between the bottom end of the raw material bin 220 and the top end of the coarse material chamber 210A, and the heat flow flowing through the inner end of the auxiliary guide plate 240 is discharged outward through the end opening of the exhaust head 243, and the end opening of the exhaust head 243 is provided with a filter 244 to prevent the dry powder left after the drying work is completed from entering the inner end of the exhaust head 243, causing clogging. Figure 6 As shown, the direction of the heat flow discharged from the end opening of the exhaust head 243 passes through the top opening of the fine material chamber 210B, and acts on the raw material particles falling from the bottom opening of the raw material bin 220. The power generated by the airflow is used to blow the fine particles in the raw material particles away from the initial falling path, follow the heat flow to the top opening of the main diverter plate 230, and fall from top to bottom along the top opening along the inner end of the fine material chamber 210B. The large particles remaining on the initial path will fall downward along the initial path to the coarse material chamber 210A because their gravity overcomes the power generated by the heat flow, and then fall from top to bottom along the inner end of the coarse material chamber 210A, thereby realizing automatic material separation. At the same time, the heat generated by the heat flow continuously flowing through the inner ends of the auxiliary guide plate 240 and the main guide plate 230 will act on the corresponding areas, wherein the heat released by the heat flow flowing through the inner end of the main guide plate 230 will diffuse to both sides, namely the inner ends of the coarse material chamber 210A and the fine material chamber 210B, to dry the fallen fine particles and perform a primary drying treatment on the fallen coarse particles, while the heat released by the heat flow flowing along the inner end of the auxiliary guide plate 240 will diffuse to the inner end of the coarse material chamber 210A, to perform a secondary drying treatment on the fallen coarse particles, thereby performing adaptive drying treatment according to the different water contents of the coarse and fine particles, thereby improving the drying effect.

[0015] Furthermore, in order to improve the material separation effect, Figure 4 As shown, in this solution, the exhaust head 243 is designed to be an inclined structure with an inclination angle of 45 degrees to 60 degrees, so that the opening of the exhaust head 243 is directly opposite to the opening at the top of the fine material chamber 210B, thereby accelerating the discharge speed of fine particles and improving the screening effect. At the same time, the top of the main diverter 230 is designed to be a right-angle structure, and the oblique edge of the top of the main diverter 230 is close to one end of the fine material chamber 210B. Since the blown fine particles can easily come into contact with the top of the main diverter 230 during the flow process, if the top of the main diverter 230 is a flat structure, it will cause fine particles to accumulate. The set oblique edge can guide the fine particles, thereby avoiding accumulation and improving the flow effect of fine particles.

[0016] In addition, since the blown fine particles have a certain kinetic potential energy, some of the fine particles are easily diffused to different areas of the inner end of the fine material chamber 210B during the process of being blown into the inner end of the fine material chamber 210B, resulting in an excessively large flow range, that is, some fine particles are far away from the main diverter plate 230, and some fine particles are close to the main diverter plate 230, which still causes uneven drying in a small area. In order to avoid this problem, as Figure 3 As shown, in this solution, an inner adjustment plate 260 is provided at the inner end of the fine material chamber 210B. The top end of the inner adjustment plate 260 extends upward and contacts the bottom of the inner end of the batching equipment 20, and isolates the inner end of the fine material chamber 210B, so that the fine particles flowing in the fine material chamber 210B are gathered to the side close to the main diverter plate 230, thereby improving the drying effect and ensuring the uniformity of drying. At the same time, the inner adjustment plate 260 can keep sliding at the inner end of the fine material chamber 210B, and freely adjust the size of the isolated area to adapt to the gathering work of different fine particles.

[0017] Furthermore, in order to further adapt to the drying work of raw material particles of different sizes, an extrusion plate 252 is provided at the inner end of the main guide plate 230 and the inner end of the auxiliary guide plate 240, and the extrusion plate 252 is kept in sliding connection with the inner ends of the main guide plate 230 and the auxiliary guide plate 240, and the extrusion plate 252 is used to divide the heat flow space of the inner ends of the main guide plate 230 and the auxiliary guide plate 240. At the same time, a rotating rod 250 is connected between the sides of the two extrusion plates 252. The end of the rotating rod 250 away from the extrusion plate 252 extends out of the outside of the batching equipment 20, and the outer side of the end is provided with a thread. The outer side of the batching equipment 20 is provided with a sleeve 250 that is kept in threaded connection with the rotating rod 250. 1. The positions of the two extrusion plates 252 are adjusted by rotating the rotating rod 250, thereby changing the size of the area divided at the inner end of the main guide plate 230 and the inner end of the auxiliary guide plate 240. For example, when the content of fine particles in the raw material particles is small, the amount of fine particles blown away from the initial path and discharged into the inner end of the fine material chamber 210B will be reduced. At this time, in order to prevent excessive drying, it is necessary to rotate the rotating rod 250 to move the two extrusion plates 252 toward the fine material chamber 210B, so that the area of the inner end of the main guide plate 230 close to the fine material chamber 210B is reduced, and the corresponding flow heat is reduced, thereby reducing the heat supply to adapt to the corresponding particle flow rate and improve the drying effect.

[0018] The present invention divides the area by setting a main guide plate 230. When conveying raw materials, the heat flow discharged from the inner end of the exhaust head 243 is used to separate particles of different sizes in the raw material particles and guide them to the corresponding areas divided by the main guide plate 230. At the same time, the main guide plate 230 cooperates with the auxiliary guide plate 240 to guide the heat flow discharged from the inner end of the air supply component to different areas of the inner end of the batching equipment 20. The amount of heat released and the length of drying time are used to adapt to the drying work of raw material particles of different sizes, perform adaptive drying treatment, and improve the drying effect.

[0019] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A raw material conveying device for extrusion molding of thermoplastic polyurethane elastomer, comprising an extrusion table (10), an extrusion bin (110), and an extrusion assembly (120), wherein a discharge hopper (130) is provided at the top end of the extrusion bin (110), and a partition plate (131) is provided at the inner end of the discharge hopper (130), characterized in that: A batching device (20) is provided at the top of the discharge hopper (130), and the batching device (20) includes a batching bin (210) and a raw material bin (220) connected to the top of the batching bin (210). A main guide plate (230) is provided in the middle of the batching bin (210), and the inner end of the batching bin (210) is divided into a coarse material chamber (210A) and a fine material chamber (210B) by the main guide plate (230). A secondary guide plate (240) is provided at the inner end of the coarse material chamber (210A) away from the fine material chamber (210B). The top end of the main deflector plate (230) is connected to an air supply component, and a heat flow flowing from top to bottom is generated at the inner end thereof by utilizing the air supply component. The bottom end of the main deflector plate (230) is connected to the bottom end of the auxiliary deflector plate (240), and the heat flow at the inner end of the main deflector plate (230) is introduced into the inner end of the auxiliary deflector plate (240), and a heat flow flowing from bottom to top is generated at the inner end thereof; The bottom end of the raw material bin (220) faces the inner end of the coarse material chamber (210A), and the raw materials in the inner end of the raw material bin (220) are discharged into the inner end of the coarse material chamber (210A) by gravity. The top end of the auxiliary guide plate (240) is in a conducting state, and the opening is aligned with the raw material flow path. The discharged airflow is used to separate the fallen raw materials, and the fine materials follow the airflow and are discharged into the fine material chamber (210B). The heat flow flowing through the inner end of the main guide plate (230) is used for drying. The coarse materials maintain the initial flow path and are discharged into the coarse material chamber (210A). The heat flow through the inner end of the main guide plate (230) and the inner end of the auxiliary guide plate (240) is used for cyclic drying.

2. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 1, characterized in that: The air supply assembly comprises an air supply pump (140) and an air supply pipe (141) maintained in communication with the air supply pump (140); the air supply pipe (141) is maintained in communication with the top of the inner end of the main deflector plate (230).

3. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 2, characterized in that: A main diverter (231) is provided at the top of the inner end of the main diverter plate (230), and the top of the main diverter plate (231) is kept in communication with the pipe mouth of the air supply pipe (141), guiding the heat flow provided by the air supply pump (140) to the inner end of the main diverter plate (230), generating a heat flow flowing from top to bottom; a secondary diverter plate (240) is provided at the bottom of the inner end of the secondary diverter plate (240), and a connecting pipe (232) is connected between the bottom end of the secondary diverter plate (241) and the bottom end of the main diverter plate (230), guiding the heat flow at the inner end of the main diverter plate (230) to the inner end of the secondary diverter plate (240), and generating a heat flow flowing from bottom to top at the inner end of the secondary diverter plate (240).

4. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 3, characterized in that: The top end of the secondary guide plate (240) is provided with a guide groove (242), and the top end of the guide groove (242) is provided with an exhaust head (243) in communication therewith, and the end opening of the exhaust head (243) faces the area between the bottom end of the raw material bin (220) and the top end of the coarse material chamber (210A), and discharges the heat flow flowing at the inner end of the secondary guide plate (240) outward through the end opening of the exhaust head (243).

5. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 4, characterized in that: The exhaust head (243) is provided with a filter screen (244) at the end opening.

6. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 5, characterized in that: The exhaust head (243) is designed as an inclined structure, and the inclination angle is 45 degrees to 60 degrees.

7. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 3, characterized in that: The top end of the main diverter plate (230) is designed as a right-angle structure, and the oblique edge of the top end of the main diverter plate (230) is close to one end of the fine material chamber (210B).

8. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 7, characterized in that: An inner adjustment plate (260) is provided at the inner end of the fine material chamber (210B). The top end of the inner adjustment plate (260) extends upward and contacts the bottom of the inner end of the batching device (20), thereby isolating the inner end of the fine material chamber (210B) and gathering fine particles flowing in the fine material chamber (210B) to a side close to the main diverter plate (230).

9. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 8, characterized in that: The inner adjustment plate (260) keeps sliding with the inner end of the fine material chamber (210B), and the size of the isolated area can be freely adjusted.

10. The raw material conveying device for thermoplastic polyurethane elastomer extrusion molding according to claim 9, characterized in that: The inner ends of the main guide plate (230) and the auxiliary guide plate (240) are both provided with an extrusion plate (252), and the extrusion plate (252) is kept in sliding connection with the inner ends of the main guide plate (230) and the auxiliary guide plate (240). The extrusion plate (252) is used to divide the heat flow space of the inner ends of the main guide plate (230) and the auxiliary guide plate (240). At the same time, a rotating rod (250) is connected between the side surfaces of the two extrusion plates (252). The end of the rotating rod (250) away from the extrusion plate (252) extends out of the outside of the batching equipment (20), and the outer side of the end is provided with a thread. The outer side of the batching equipment (20) is provided with a sleeve (251) which is kept in threaded connection with the rotating rod (250).

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