A melt feed device for thermoplastic polyurethane elastomers

Abstract

The utility model relates to the technical field of plastic processing equipment discloses a kind of thermoplastic polyurethane elastomer melting feed device suitable for, including support assembly, shell assembly, stirring assembly and drying assembly, the shell assembly includes the first shell with feed inlet and discharge port, the stirring assembly includes the main shaft being set in the first shell, the main shaft is fixed with stirring rod and the spiral stirring blade of lower end, the spiral stirring blade corresponds the discharge port.The utility model integrates material mixing, forced conveying and outlet drying function, solves the problem that material is easily re-hydrated in the prior art with complicated process, the device compact structure can be adjusted height by the hydraulic lifting rod, strong applicability, can effectively ensure the dryness of material into melting equipment, improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing equipment technology, and in particular to a melting and feeding device suitable for thermoplastic polyurethane elastomers. Background Technology

[0002] Thermoplastic polyurethane elastomer (TPU) is a widely used engineering plastic, but it is highly hygroscopic. If the material contains moisture before melt processing (such as injection molding or extrusion), it will hydrolyze at high temperatures, severely reducing the physical properties of the material and causing defects such as bubbles and silver streaks in the finished product.

[0003] Therefore, thermoplastic polyurethane elastomers must be thoroughly dried before being fed into the melting equipment. Furthermore, in actual production, TPU raw materials often need to be premixed with color masterbatches, antioxidants, and other additives to ensure uniform color and stable performance of the final product.

[0004] In existing technologies, drying and mixing steps are typically separate. Operators commonly use hot air drying hoppers or dehumidifying dryers to dry materials offline for extended periods before transferring them to the hopper of the melting equipment. If mixing is required, additional mixing and agitation equipment may also be necessary.

[0005] This separate processing method is cumbersome, not only occupying a large production space and taking a long time, but also posing a risk that the dried material will re-absorb moisture upon contact with air during transfer and while waiting for feeding. In addition, the independent mixing and feeding equipment has limited functionality, and there is a lack of a compact device that can integrate premixing, forced feeding, and instant drying functions, making it difficult to guarantee feeding efficiency and the stability of melt processing.

[0006] Therefore, this utility model proposes a melting and feeding device suitable for thermoplastic polyurethane elastomers to overcome the shortcomings of the prior art. Utility Model Content

[0007] In view of the problems in the existing thermoplastic polyurethane elastomer melt feeding device, which separates the material mixing, drying and feeding steps, resulting in a complicated process and easy re-moisture absorption of materials, this utility model aims to provide a thermoplastic polyurethane elastomer melt feeding device with an improved structure that can effectively solve the above problems.

[0008] This utility model provides a melting and feeding device for thermoplastic polyurethane elastomers, comprising: a support assembly; a housing assembly disposed on the support assembly, the housing assembly including a first outer shell supported by a connecting rod, the first outer shell having a feed inlet at its top and a discharge outlet at its bottom; a stirring assembly disposed on the housing assembly, the stirring assembly including a main shaft rotatably disposed within the first outer shell, a stirring rod fixedly connected to the main shaft, a spiral stirring blade fixedly connected to the lower end of the main shaft, the spiral stirring blade being disposed corresponding to the discharge outlet; and a drying assembly.

[0009] The drying assembly includes a cover tube fixedly connected to the discharge port, and a drying air duct is provided inside the cover tube. The drying assembly also includes a hot air unit for generating hot air and conveying it to the drying air duct.

[0010] Furthermore, the end of the spiral stirring blade of the stirring assembly extends into the shroud. Through this structural combination, the material is forced out of the first outer shell by the spiral stirring blade, and at the same time, it comes into contact with the hot air from the drying duct inside the shroud, thus achieving a close integration of mixing, conveying and drying functions.

[0011] Preferably, the support assembly further includes a base and a connecting seat; the hydraulic lifting rod is vertically mounted on the base; the connecting seat is fixedly connected between the lifting end of the hydraulic lifting rod and the connecting rod. This arrangement provides a stable grounding foundation for the entire device and achieves the lifting function through the hydraulic lifting rod.

[0012] Preferably, the support assembly further includes bolts for securing the base. By using these bolts, the base can be firmly anchored to the workshop floor, ensuring that the equipment does not shift or tip over during operation, especially when the mixing component is working.

[0013] Preferably, the stirring assembly further includes a motor, a spur gear, a housing, and a bevel gear; the motor is fixedly connected to the connecting rod as a power source; the housing is fixedly connected to the top of the first outer shell; the bevel gear is fixedly connected to the upper end of the main shaft; the spur gear is driven by the motor and meshes with the bevel gear, and both the spur gear and the bevel gear are housed within the housing. This transmission structure cleverly converts the horizontal rotation output by the motor into the vertical rotation of the main shaft through the meshing of the spur gear and the bevel gear.

[0014] Preferably, the hot air unit includes a fan, a heating element, and a pipe; the air outlet of the fan is connected to the air inlet of the heating element, the air outlet of the heating element is connected to the pipe, and the other end of the pipe is connected to the cover pipe. The fan provides an air source, the heating element heats the airflow, and the pipe serves as a hot air delivery channel.

[0015] Preferably, a heating mesh is provided inside the heating tube. The heating mesh is preferably a resistance wire mesh, which can rapidly generate high temperature when energized and has a large heat exchange area, so that the air flowing through the heating tube can be heated quickly and evenly, improving the efficiency of hot air preparation.

[0016] Preferably, the drying assembly further includes a second outer shell and a chassis; the fan and the heating tube are both disposed inside the second outer shell, which provides housing and protection for the hot air preparation unit; the chassis is disposed on the second outer shell and is used to control the heating tube and the start and stop of the fan, thereby realizing centralized control of the drying function.

[0017] Preferably, there are three feed inlets, arranged side by side on the top of the first housing. This arrangement allows the operator to add different types of materials, such as TPU base material, color masterbatch, or functional additives, to the first housing simultaneously or separately for mixing by the stirring assembly.

[0018] This utility model has the following beneficial effects: 1. This utility model, by setting up a stirring assembly, a shell assembly, and a drying assembly, especially by setting the spiral stirring blade at the outlet of the first shell and extending it into the cover tube, and simultaneously setting a drying air duct inside the cover tube, solves the problems of the separation of mixing, drying and feeding steps of thermoplastic polyurethane elastomer materials in the prior art, the large equipment footprint and complicated process, and achieves the technical effect of integrating material mixing, forced conveying and outlet drying functions into one, with a compact structure and improved production efficiency.

[0019] 2. This utility model, by setting up a drying component, allows the hot air generated by the hot air unit to be transported through a pipeline to the drying air duct inside the cover tube, thereby instantly drying the material pushed into the cover tube by the spiral stirring blades. This solves the problem that the material may become damp before being transported to the melting equipment, or may require a long period of offline drying, which could lead to material hydrolysis and affect product quality. It achieves the technical effect of rapid drying of the material in the final stage of feeding, ensuring the dryness of the material entering the downstream melting equipment and improving the quality of melting processing.

[0020] 3. This utility model solves the problem that existing feeding devices have a fixed height and are difficult to connect with downstream melting equipment with different feeding heights by setting up a support component, especially by using a hydraulic lifting rod to support the connecting rod and the upper shell component. It achieves the technical effect of adjustable overall height and strong applicability of the device, and facilitates on-site installation and connection. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a thermoplastic polyurethane elastomer melting and feeding device proposed in this utility model; Figure 2 This is a schematic diagram of the structure of a hydraulic lifting rod suitable for a thermoplastic polyurethane elastomer melting and feeding device proposed in this utility model; Figure 3 This is a cross-sectional schematic diagram of the first outer shell of a thermoplastic polyurethane elastomer melting and feeding device proposed in this utility model. Figure 4 This is a cross-sectional schematic diagram of a cover tube for a thermoplastic polyurethane elastomer melting and feeding device proposed in this utility model.

[0022] Legend: 1. Support assembly; 101. Base; 102. Hydraulic lifting rod; 103. Connecting seat; 104. Bolt; 105. Connecting rod; 2. Stirring assembly; 201. Motor; 202. Spur gear; 203. Cover; 204. Bevel gear; 205. Main shaft; 206. Stirring rod; 207. Spiral stirring blade; 3. Shell assembly; 301. First outer shell; 302. Feed inlet; 4. Drying assembly; 401. Second outer shell; 402. Fan; 403. Chassis; 404. Heating grid; 405. Pipe; 406. Cover pipe; 407. Drying air duct; 408. Heating tube. Detailed Implementation

[0023] 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.

[0024] Example: Please refer to Figures 1 to 4This utility model provides a melting feeding device for thermoplastic polyurethane elastomers, which aims to solve the problem of uneven mixing or material moisture absorption caused by the separation of mixing, drying and feeding steps of thermoplastic polyurethane elastomer materials in the prior art and the lack of integrated devices.

[0025] like Figure 1 As shown, the thermoplastic polyurethane elastomer melt feeding device includes a support assembly 1, a housing assembly 3 disposed on the support assembly 1, a stirring assembly 2 disposed on the housing assembly 3, and a drying assembly 4 disposed on the housing assembly 3.

[0026] like Figure 2 As shown, the support assembly 1 includes a base 101, bolts 104, a hydraulic lifting rod 102 vertically mounted on the base 101, a connecting seat 103 fixedly connected to the lifting end of the hydraulic lifting rod 102, and a connecting rod 105 fixedly connected to the connecting seat 103. The bolts 104 pass through the base 101.

[0027] like Figure 1 and Figure 3 As shown, the housing assembly 3 includes a first housing 301 supported by a connecting rod 105. The first housing 301 has a feed inlet 302 at its top and a discharge outlet at its bottom. There are three feed inlets 302 arranged side by side at the top of the first housing 301.

[0028] like Figure 3 As shown, the stirring assembly 2 includes a vertically arranged main shaft 205 that passes through the top of the first housing 301. The main shaft 205 is located in the accommodating space of the first housing 301. A stirring rod 206 is fixedly connected to the main shaft 205. A spiral stirring blade 207 is fixedly connected to the lower end of the main shaft 205. The spiral stirring blade 207 is set corresponding to the discharge port of the first housing 301.

[0029] The stirring assembly 2 also includes a motor 201, a spur gear 202, a housing 203, and a bevel gear 204; the motor 201 is fixedly connected to the connecting rod 105; the housing 203 is fixedly connected to the top of the first housing 301; the bevel gear 204 is fixedly connected to the upper end of the main shaft 205; the spur gear 202 is driven by the motor 201 and meshes with the bevel gear 204 for transmission, and both the spur gear 202 and the bevel gear 204 are housed within the housing 203.

[0030] To solve the above-mentioned technical problems, the device also includes a drying component 4, and the drying component 4 forms a specific structural fit and connection relationship with the aforementioned shell component 3 and stirring component 2.

[0031] Please refer to the following carefully. Figure 3 and Figure 4 The core structure will be described in detail below: The drying assembly 4 includes a cover tube 406 fixedly connected to the discharge port of the first housing 301, the end of the spiral stirring blade 207 extending into the cover tube 406, and a drying air duct 407 disposed inside the cover tube 406.

[0032] The drying assembly 4 also includes a hot air unit for generating hot air and conveying it to the drying duct 407.

[0033] The hot air unit includes a fan 402, a heating tube 408, and a pipe 405. The air outlet of the fan 402 is connected to the air inlet of the heating tube 408, the air outlet of the heating tube 408 is connected to the pipe 405, and the other end of the pipe 405 is connected to the cover pipe 406.

[0034] A heating mesh 404 is installed inside the heating tube 408.

[0035] The drying assembly 4 also includes a second housing 401 and a chassis 403; the fan 402 and the heating tube 408 are both disposed inside the second housing 401; the chassis 403 is disposed on the second housing 401 and is used to control the heating tube 408.

[0036] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, please refer to Figure 2 The support assembly 1 also includes a base 101 and a connecting seat 103. The hydraulic lifting rod 102 is vertically arranged on the base 101, and the connecting seat 103 is fixedly connected between the lifting end of the hydraulic lifting rod 102 and the connecting rod 105. More preferably, the support assembly 1 also includes a bolt 104, which is used to fix the base 101.

[0037] As a preferred embodiment, please refer to Figure 3 The stirring assembly 2 also includes a motor 201, a spur gear 202, a housing 203, and a bevel gear 204. The motor 201 is fixedly connected to the connecting rod 105, the housing 203 is fixedly connected to the top of the first housing 301, and the bevel gear 204 is fixedly connected to the upper end of the main shaft 205. The spur gear 202 is driven by the motor 201 and meshes with the bevel gear 204. Both the spur gear 202 and the bevel gear 204 are housed within the housing 203.

[0038] As a preferred embodiment, please refer to Figure 4The hot air unit includes a fan 402, a heating tube 408, and a pipe 405. The air outlet of the fan 402 is connected to the air inlet of the heating tube 408, and the air outlet of the heating tube 408 is connected to the pipe 405. The other end of the pipe 405 is connected to the cover pipe 406. Preferably, a heating mesh 404 is provided inside the heating tube 408. More preferably, the drying assembly 4 also includes a second outer shell 401 and a housing 403. The fan 402 and the heating tube 408 are both disposed inside the second outer shell 401, and the housing 403 is disposed on the second outer shell 401 and is used to control the heating tube 408.

[0039] As a preferred embodiment, please refer to Figure 3 There are three feed inlets 302, which are arranged side by side on the top of the first housing 301.

[0040] The working principle of this utility model applicable to the thermoplastic polyurethane elastomer melt feeding device is as follows: In use, the base 101 is fixed with bolts 104, and the height is adjusted by the hydraulic lifting rod 102 adjustment device. The lifting end of the hydraulic lifting rod 102 is connected to the connecting rod 105 via the connecting seat 103. Material is added from the feed port 302 at the top of the first housing 301. The motor 201, fixed to the connecting rod 105, is started. The motor 201 drives the spur gear 202, which meshes with the bevel gear 204. Both the spur gear 202 and the bevel gear 204 are housed within the casing 203. The bevel gear 204 is fixedly connected to the upper end of the main shaft 205 and drives the main shaft 205 to rotate. The stirring rod 206 on the main shaft 205 mixes the material inside the first outer casing 301, and the spiral stirring blades 207 at the lower end of the main shaft 205 convey the mixed material downwards. Simultaneously, the chassis 403 mounted on the second outer casing 401 activates the hot air unit, and the fan 402 mounted inside the second outer casing 401 generates airflow. The airflow enters the heating pipe 408 and is heated by the heating mesh 404 inside the heating pipe 408 to form hot air. The hot air is then transported to the cover pipe 406 via the pipe 405. When the material is pushed into the shroud 406 fixedly connected to the discharge port by the spiral mixing blades 207, hot air from the pipe 405 enters the drying air pipe 407 inside the shroud 406 and is blown out from the drying air pipe 407 to dry the material passing through the shroud 406. Through this synergistic effect of the mixing component 2 and the drying component 4, this invention solves the problem of material mixing and drying separation in the prior art, which easily leads to material moisture absorption. 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 device for melting and feeding thermoplastic polyurethane elastomers, comprising: The support assembly (1) includes a hydraulic lifting rod (102) for adjusting the height and a connecting rod (105) for support. The housing assembly (3) includes a first outer shell (301) supported by the connecting rod (105), the first outer shell (301) having a feed inlet (302) at the top and a discharge outlet at the bottom; The stirring assembly (2) includes a main shaft (205) rotatably disposed within the first housing (301), a stirring rod (206) fixedly connected to the main shaft (205), and a spiral stirring blade (207) fixedly connected to the lower end of the main shaft (205), the spiral stirring blade (207) being disposed corresponding to the discharge port; The device is characterized in that it further includes a drying assembly (4), which includes a cover tube (406) fixedly connected to the discharge port, the end of the spiral stirring blade (207) extending into the cover tube (406), and a drying air duct (407) provided inside the cover tube (406). The drying assembly (4) also includes a hot air unit for generating hot air and conveying it to the drying air duct (407).

2. The apparatus according to claim 1, characterized in that, The support assembly (1) also includes a base (101) and a connecting seat (103). The hydraulic lifting rod (102) is vertically mounted on the base (101), and the connecting seat (103) is fixedly connected between the lifting end of the hydraulic lifting rod (102) and the connecting rod (105).

3. The apparatus according to claim 2, characterized in that, The support assembly (1) further includes bolts (104) for securing the base (101).

4. The apparatus according to claim 1, characterized in that, The stirring assembly (2) further includes a motor (201), a spur gear (202), a housing (203), and a bevel gear (204); the motor (201) is fixedly connected to the connecting rod (105); the housing (203) is fixedly connected to the top of the first outer shell (301); the bevel gear (204) is fixedly connected to the upper end of the main shaft (205); the spur gear (202) is driven by the motor (201) and meshes with the bevel gear (204); both the spur gear (202) and the bevel gear (204) are housed within the housing (203).

5. The apparatus according to claim 1, characterized in that, The hot air unit includes a fan (402), a heating tube (408), and a pipe (405). The air outlet of the fan (402) is connected to the air inlet of the heating tube (408), the air outlet of the heating tube (408) is connected to the pipe (405), and the other end of the pipe (405) is connected to the cover pipe (406).

6. The apparatus according to claim 5, characterized in that, A heating mesh (404) is provided inside the heating tube (408).

7. The apparatus according to claim 5, characterized in that, The drying assembly (4) further includes a second outer shell (401) and a chassis (403). The fan (402) and the heating tube (408) are both disposed inside the second outer shell (401). The chassis (403) is disposed on the second outer shell (401) and is used to control the heating tube (408).

8. The apparatus according to claim 1, characterized in that, The number of feed inlets (302) is three, which are arranged side by side on the top of the first housing (301).

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