A cutting device for the production of thermoplastic polyurethane elastomers

Abstract

The utility model relates to high polymer material processing equipment technical field discloses a kind of pelletizing device for thermoplastic polyurethane elastomer production, including support, pelletizing cavity, pelletizing assembly and first water pump etc., it is also provided with the stirring tank being communicated with the pelletizing cavity downstream, and the stirring assembly being located in stirring tank, the stirring assembly includes stirring motor, stirring shaft and scraper frame, the downstream of the stirring tank is also connected with the discharging assembly, and the discharging assembly includes filter box, filter pocket that can be driven by discharging motor and overturning.The utility model is forced to stir and secondary cooling to particle by additional stirring assembly, solve the problem of secondary adhesion of particle due to residual heat release, realize the automation of solid-liquid separation and discharging by motor-driven filter pocket overturning discharging assembly, improve production efficiency.The device structure is reasonable, and the quality of particle finished product can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing equipment technology, and in particular to a pelletizing device for the production of thermoplastic polyurethane elastomers. Background Technology

[0002] Thermoplastic polyurethane elastomer (TPU), as a polymer material with excellent comprehensive properties, has been widely used in many fields such as electronic products, medical devices, and automotive parts. In the industrial production process, processing the molten polymer into uniform granular finished products is one of the key subsequent processes, which is usually accomplished by a pelletizing device.

[0003] For materials like thermoplastic polyurethane, which have high viscosity in the molten state, underwater pelletizing is a common process in the industry. This process involves extruding the molten material into a stream of water the instant it leaves the die, where it is then cut by a high-speed rotating cutter. The enveloping and cooling effect of the water flow helps prevent newly formed pellets from sticking together due to the high temperature.

[0004] However, existing underwater pelletizing processes still have shortcomings. After being cut and initially cooled, the pellets are typically carried directly by the water flow into a simple collection or dehydration area. Due to the extremely rapid pelleting process and the short cooling time of the water flow, a large amount of heat still accumulates inside the pellets. When these pellets carrying residual heat pile up in the collection area, the internal heat continues to be conducted outwards, causing the surface temperature of the pellets to rise again and soften, resulting in secondary adhesion and ultimately forming clumps of varying sizes, which seriously affects product quality and subsequent applications.

[0005] Therefore, this utility model proposes a pelletizing device for the production of thermoplastic polyurethane elastomers to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems existing in the pelletizing device for the production of thermoplastic polyurethane elastomers, such as insufficient cooling of particles leading to secondary adhesion, reduced finished product quality, and low automation of particle-water separation and discharge processes, this utility model aims to provide a pelletizing device for the production of thermoplastic polyurethane elastomers with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a pelletizing device for the production of thermoplastic polyurethane elastomers, including a support, a feeding hopper, a feeding pipe, a pelletizing chamber, a pelletizing motor, a rotating shaft, a cutter, a water tank and a first water pump; as well as a mixing tank, a mixing assembly and a feeding assembly.

[0008] The stirring assembly is located inside the stirring tank and includes a stirring motor fixed to the top of the stirring tank, a stirring shaft fixed to the output end of the stirring motor, and a scraper frame fixedly connected to the stirring shaft.

[0009] Furthermore, the feeding assembly includes a filter box located below the mixing tank, a filter bag rotatably disposed inside the filter box, and a feeding motor fixed to one side of the filter box. The feeding motor drives the filter bag to achieve a flipping motion through a combination structure of a rotating rod and a connecting block.

[0010] Preferably, the stirring assembly further includes an inclined plate fixed inside the scraper frame. The inclined plate's tilting configuration generates an additional up-and-down tumbling force on the particles and water flow inside the tank when the scraper frame rotates horizontally, resulting in more three-dimensional and thorough stirring, further improving cooling uniformity.

[0011] Preferably, a solenoid valve is installed between the bottom of the mixing tank and the filter box. The opening and closing of this solenoid valve allows for precise control of the timing of material transfer from the mixing stage to the feeding stage, enhancing the level of automation control throughout the entire process.

[0012] Preferably, the pelletizing device further includes a second water pump, the input end of which is connected to the filter box, and the output end which delivers water to the top of the water tank. This second water pump pumps the filtered cooling water back to the water tank, forming a complete closed-loop water resource circulation system, significantly saving water.

[0013] Preferably, the feeding assembly further includes a fixing plate fixed to one side of the filter box, through which the rotating rod rotatably passes. The fixing plate provides a stable rotational support point for the rotating rod, ensuring the smoothness and reliability of the filter bag's flipping action.

[0014] Preferably, the pelletizing device further includes a collection box located next to the filter box. This collection box is used to receive and collect the final finished pellets poured out by the overturned filter bag, making the collection of the finished product more centralized and convenient.

[0015] Preferably, a toolbox is placed on the lower left side of the bracket. This arrangement provides on-site operators with space to store maintenance tools, facilitating timely inspection and maintenance of the equipment.

[0016] Preferably, the scraper frame is positioned close to the inner wall of the mixing tank. This close proximity ensures that the scraper frame can effectively scrape off any semi-solid particles that may adhere to the inner wall of the tank when rotating, preventing material residue and blockage, and ensuring the continuous operation of the equipment.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem of uneven cooling and easy adhesion of thermoplastic polyurethane particles after underwater pelletizing due to residual heat release and accumulation by setting up a mixing tank and a mixing component in the mixing tank that can perform three-dimensional mixing of particles. It achieves the technical effect of thorough cooling and shaping, effectively preventing particle agglomeration, and thus ensuring that the final product particles are independent and have a regular shape.

[0018] 2. This utility model solves the problems of low automation and reliance on manual operation in the existing technology of particle and water separation and finished product discharge process by setting a feeding component that drives the filter bag to flip by a feeding motor. It achieves the technical effect of automatically completing solid-liquid separation and finished product discharge, which significantly improves production efficiency and reduces labor intensity.

[0019] 3. This utility model solves the problem of direct discharge of cooling water after use, which leads to resource waste and high production costs, by setting a second water pump to pump the cooling water separated in the filter box back to the water tank. It achieves the technical effect of water resource recycling and reducing production costs. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a pelletizing device for the production of thermoplastic polyurethane elastomers according to the present invention. Figure 2 This is a schematic diagram of the structure of the cutter in a pelletizing device for the production of thermoplastic polyurethane elastomers according to this utility model. Figure 3 This is a schematic diagram of the stirring assembly of a pelletizing device for the production of thermoplastic polyurethane elastomers proposed in this utility model. Figure 4 This is a schematic diagram of the structure of the collection box of a pelletizing device for the production of thermoplastic polyurethane elastomers proposed in this utility model; Figure 5 This is a schematic diagram of the feeding assembly of a pelletizing device for the production of thermoplastic polyurethane elastomers proposed in this utility model.

[0021] Legend: 1. Support frame; 2. Feed hopper; 3. Feed pipe; 4. First water pump; 5. Second water pump; 6. Round hole; 7. Pelletizing motor; 8. Rotating shaft; 9. Cutter; 10. Pelletizing chamber; 11. Mixing assembly; 1101. Mixing tank; 1102. Mixing motor; 1103. Mixing shaft; 1104. Inclined plate; 1105. Scraper frame; 12. Solenoid valve; 13. Discharge assembly; 1301. Filter box; 1302. Filter bag; 1303. Connecting block; 1304. Rotating rod; 1305. Fixing plate; 1306. Discharge motor; 1307. Collection box; 14. Tool box; 15. Water tank. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in 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 a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Example: Please refer to Figures 1 to 5 This utility model provides a pelletizing device for the production of thermoplastic polyurethane elastomers, which aims to solve the problems in the prior art where thermoplastic polyurethane particles stick together after pelletizing due to uneven cooling, and the low degree of automation in particle-water separation and discharge processes.

[0024] like Figure 1 As shown, the pelletizing device for the production of thermoplastic polyurethane elastomers includes a support 1 serving as a mounting base. A feed hopper 2 is fixedly connected to the upper part of the support 1, and a feed pipe 3 is connected to the lower part of the feed hopper 2. A pelletizing chamber 10 is fixedly connected to the lower end of the feed pipe 3. A mixing tank 1101 and a feeding assembly 13 are connected to the downstream of the pelletizing chamber 10 via pipes. A water tank 15, a first water pump 4, a second water pump 5, and connecting pipes constitute the water circulation cooling mechanism of the entire device.

[0025] Specifically, refer to Figure 1 and Figure 3The mixing tank 1101 and mixing assembly 11 of this solution are used for secondary cooling and anti-sticking treatment of the mixture of particles and water conveyed from the pelletizing chamber 10. The mixing assembly 11 is disposed inside the mixing tank 1101 and includes a mixing motor 1102 fixedly installed on the top of the mixing tank 1101. The output end of the mixing motor 1102 is vertically downward and fixedly connected to a mixing shaft 1103, which extends into the interior of the mixing tank 1101. A scraper frame 1105 is fixedly connected to the mixing shaft 1103, and the outer edge of the scraper frame 1105 is closely fitted to the inner wall of the mixing tank 1101. When the stirring motor 1102 drives the stirring shaft 1103 to rotate, the scraper frame 1105 rotates synchronously, continuously scraping and removing particles that may adhere to the inner wall of the mixing tank 1101. In order to achieve a more three-dimensional stirring effect, an inclined plate 1104 is also fixedly connected inside the scraper frame 1105. The inclined plate 1104 is set at an inclined angle relative to the axis of the stirring shaft 1103. When it rotates with the scraper frame 1105, it can generate an up-and-down stirring effect on the particles and water flow in the tank, ensuring that each particle can fully contact the cooling water, thereby avoiding the particles from sticking together due to local overheating.

[0026] To solve the above-mentioned technical problems, the pelletizing device for the production of thermoplastic polyurethane elastomers also includes a feeding component 13, which cooperates with the downstream of the mixing tank 1101 to realize the automatic separation of particles and water and the tumbling discharge.

[0027] Please refer to the following carefully. Figure 1 , Figure 4 and Figure 5 The core structure of the feeding assembly 13 will be described in detail below: The feeding assembly 13 includes a filter box 1301 fixedly connected inside the bracket 1. The top of the filter box 1301 is connected to the bottom of the mixing tank 1101 via a pipe, and a solenoid valve 12 is installed on the connecting pipe to control the flow of fluid. A feeding motor 1306 is fixedly installed on one side of the filter box 1301, and a fixing plate 1305 for support is also fixed on the same side. A rotating rod 1304 is fixedly connected to the output end of the feeding motor 1306. The rotating rod 1304 rotatably passes through the fixing plate 1305 and extends into the interior of the filter box 1301. Inside the filter box 1301, a rotatable... The filter bag 1302 is fixedly connected to the end of the rotating rod 1304 via a connecting block 1303. When particles and water flowing out of the mixing tank 1101 enter the filter box 1301, the filter bag 1302 can intercept the particles and allow the water to flow out. Then, the feeding motor 1306 starts, driving the rotating rod 1304 to rotate, which in turn drives the filter bag 1302 to flip over, pouring the filtered particle product into the collection box 1307 located next to the filter box 1301. This structure, in which the filter bag 1302 is driven to flip by a motor, ensures a high degree of automation and efficiency in the solid-liquid separation and discharge process.

[0028] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, please refer to Figure 3 In order to enhance the mixing effect of granular materials, an inclined plate 1104 is fixedly connected inside the scraper frame 1105 of the mixing assembly 11. This structure can drive the particles and water flow to tumble in the up and down direction while the scraper frame 1105 rotates horizontally.

[0029] As another preferred embodiment, please refer to Figure 1 In order to achieve precise control of the material flow, a solenoid valve 12 is installed on the pipe connecting the bottom of the mixing tank 1101 and the filter box 1301. By controlling the opening and closing of the solenoid valve 12, it can be determined when the material in the mixing tank 1101 is discharged into the feeding assembly 13.

[0030] To achieve water conservation and recycling, please refer to... Figure 1 The device also includes a second water pump 5. The input end of the second water pump 5 is connected to the bottom of the filter box 1301 through a pipe for extracting the filtered cooling water, and its output end is used to transport the cooling water back to the top of the water tank 15 through a pipe.

[0031] In the feeding assembly 13, please refer to Figure 5In order to provide a stable rotational support for the rotating rod 1304, a fixing plate 1305 is also fixedly connected to one side of the filter box 1301 where the feeding motor 1306 is fixed, and the rotating rod 1304 can rotatably pass through the fixing plate 1305.

[0032] To automatically collect the final product pellets, please refer to... Figure 4 and Figure 5 A collection box 1307 is also provided on the side of the filter box 1301, and the position of the collection box 1307 corresponds to the tipping path of the filter bag 1302.

[0033] To improve the ease of equipment maintenance, a toolbox 14 is placed on the lower left side of the bracket 1.

[0034] In addition, for a preferred structural detail, please refer to Figure 3 The size of the scraper frame 1105 in the stirring assembly 11 is adapted to the inner diameter of the stirring tank 1101, so that when the scraper frame 1105 rotates, its outer edge can be close to the inner wall of the stirring tank 1101 to effectively scrape off the attached particles.

[0035] The working principle of the pelletizing device for thermoplastic polyurethane elastomer production of this utility model is as follows: First, the pelletizing and cooling process is carried out. The raw material enters the pelletizing chamber 10 through the feed hopper 2 and feed pipe 3, and is extruded into a column shape through the round hole 6 at one end of the pelletizing chamber 10. At this time, the pelletizing motor 7 installed inside the support 1 starts, driving the rotating shaft 8 and the cutter 9 fixedly connected to one end to rotate at high speed. The cutter 9 closely follows the round hole 6 to quickly cut the extruded column into pellets. At the same time, the first water pump 4 draws out the cold water from the bottom of the water tank 15 and delivers it into the pelletizing chamber 10. The cold water quickly cools and shapes the newly formed pellets. Then, the water flow carries the pellets into the mixing tank 1101 through the pipe.

[0036] When the particles enter the mixing tank 1101 with the water flow, the mixing assembly 11 starts to work. The mixing motor 1102 fixed on the top of the mixing tank 1101 drives the mixing shaft 1103 and the fixedly connected scraper frame 1105 and the internal inclined plate 1104 to rotate. The rotating inclined plate 1104 repeatedly stirs the particles and water flow up and down, while the scraper frame 1105, which rotates close to the inner wall of the mixing tank 1101, continuously scrapes the wall surface. Through this forced three-dimensional stirring, it can effectively prevent the particles that are not completely cooled from sticking together or adhering to the tank wall, ensuring sufficient and uniform secondary cooling.

[0037] After the mixing and cooling process is completed, the solenoid valve 12 installed at the bottom of the mixing tank 1101 is opened, and the particles and water enter the filter box 1301 of the feeding assembly 13 together. The particles are intercepted by the filter bag 1302, while the water flows to the bottom of the filter box 1301. Then, the feeding motor 1306 fixed on one side of the filter box 1301 is started, driving the rotating rod 1304 to rotate inside the fixed plate 1305. The rotating rod 1304 drives the filter bag 1302 to flip through the connecting block 1303, automatically pouring the internal particle product into the collection box 1307 located next to the filter box 1301, completing the automatic discharge.

[0038] Finally, the water in the filter box 1301 is drawn out by the input pipe of the second water pump 5 and then transported to the top of the water tank 15 by the output of the second water pump 5, thus completing the recycling of water resources; the toolbox 14 placed on the lower left of the bracket 1 can store tools for repair work in case of sudden failure.

[0039] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A pelletizing apparatus for the production of thermoplastic polyurethane elastomers, comprising: Support (1); Feed hopper (2); Feed pipe (3) connected to the feed hopper (2); A pelletizing chamber (10) is fixed on the bracket (1) and communicates with the feed pipe (3). A round hole (6) is provided at the end of the pelletizing chamber (10). A pelletizing motor (7) is installed inside the bracket (1); A rotating shaft (8) is fixedly connected to the output end of the pelletizing motor (7). A cutter (9) is fixedly connected to one end of the rotating shaft (8) and is close to the round hole (6) when rotating; Water tank (15); The first water pump (4) has its input end connected to the bottom of the water tank (15) and its output end connected to the inside of the pelletizing chamber (10); The pelletizing device is characterized in that it further includes a mixing tank (1101), a mixing assembly (11), and a feeding assembly (13), wherein the mixing tank (1101) is connected to the pelletizing chamber (10) through a pipe; The stirring assembly (11) is located inside the stirring tank (1101) and includes a stirring motor (1102) fixed to the top of the stirring tank (1101), a stirring shaft (1103) fixed to the output end of the stirring motor (1102), and a scraper frame (1105) fixedly connected to the stirring shaft (1103). The feeding assembly (13) includes a filter box (1301) fixed inside the bracket (1), a filter bag (1302) rotatably disposed inside the filter box (1301), and a feeding motor (1306) fixed to one side of the filter box (1301). The feeding motor (1306) drives the filter bag (1302) to rotate through a rotating rod (1304) and a connecting block (1303).

2. The pelletizing device according to claim 1, characterized in that, The stirring assembly (11) also includes an inclined plate (1104) fixed inside the scraper frame (1105).

3. The pelletizing device according to claim 1, characterized in that, A solenoid valve (12) is installed between the bottom of the mixing tank (1101) and the filter box (1301).

4. The pelletizing device according to claim 1, characterized in that, It also includes a second water pump (5); the input end of the second water pump (5) is connected to the filter box (1301) through a pipe, and its output end is delivered to the top of the water tank (15) through a pipe.

5. The pelletizing device according to claim 1, characterized in that, The feeding assembly (13) also includes a fixing plate (1305) fixed to one side of the filter box (1301), and the rotating rod (1304) rotatably passes through the fixing plate (1305).

6. The pelletizing device according to claim 1, characterized in that, It also includes a collection box (1307) located next to the filter box (1301) for collecting the particulate product poured out by the filter bag (1302).

7. The pelletizing device according to claim 1, characterized in that, A toolbox (14) is placed on the lower left side of the bracket (1).

8. The pelletizing device according to claim 1, characterized in that, The scraper frame (1105) is close to the inner wall of the mixing tank (1101).

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