Continuous production waste polyester fiber near-low-temperature forming device

Abstract

The utility model relates to the technical field of environment-friendly manufacturing equipment, in particular to a continuously-produced waste polyester fiber near-low-temperature forming device which comprises a discharging pipe, the bottom of the discharging pipe communicates with a drying pipe, a preheating assembly is arranged at the bottom of the drying pipe, and a cold press forming assembly is arranged on one side of the preheating assembly; through the arrangement of the electric heating pipe, the Venturi pipe, the fan blades and other components, the electric heating pipe is spirally distributed to form a heat exchange channel with the hot air pipe, so that the hot air pipe can guide high-temperature air flow into the heating cavity shell through the air inlet hole by means of the air blower, and then the air flow is accelerated through the throat part of the Venturi pipe; and flow guide grooves in the surfaces of the fan blades are matched to form rotating airflow, and falling polyester fiber materials are heated in a three-dimensional mode. A local negative pressure area is formed by the drying groove in the neck of the Venturi tube and the breathable net structure, hot air flow penetrates through a material layer, and the efficient drying effect that the water content of materials is rapidly reduced to 5% or below from 20% is achieved.

Description

Technical Field

[0001] This application relates to the field of environmentally friendly manufacturing equipment technology, and in particular to a near-low temperature molding device for continuous production of waste polyester fibers. Background Technology

[0002] Polyester fiber is widely used in modern industry and daily life, and its presence can be seen everywhere, from clothing and textiles to industrial products.

[0003] Existing waste polyester fiber molding technologies have several shortcomings. Some molding devices suffer from poor temperature control; excessively high temperatures can degrade polyester fibers, severely damaging their physical properties and leading to unstable product quality, with key indicators such as strength and toughness failing to meet usage requirements. Other equipment exhibits low drying efficiency and a lack of precise control in the preheating process, resulting in prolonged production cycles, significantly increased energy consumption, and high production costs. Still others struggle to achieve continuous production, requiring frequent manual intervention, leading to low production efficiency and inconsistent product quality, thus failing to meet the demands of large-scale industrial production.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: Existing devices may lack a heat exchange channel similar to the spiral heating tube and hot air duct inside the heating chamber shell, failing to fully utilize heat and resulting in low preheating efficiency, requiring more time and energy to achieve the same preheating effect. Furthermore, existing devices may have inadequate designs in terms of feeding and component connections, hindering continuous feeding and production of waste polyester fibers, leading to low production efficiency and difficulty in meeting the demands of large-scale production. Utility Model Content

[0005] To address the problems mentioned in the background art, this application provides a near-low temperature molding apparatus for continuous production of waste polyester fibers.

[0006] This application provides a near-low temperature forming device for continuous production of waste polyester fibers, which adopts the following technical solution: A near-low temperature forming device for continuous production of waste polyester fibers includes a feeding pipe, the bottom of which is connected to a drying pipe, a preheating component is provided at the bottom of the drying pipe, and a cold pressing forming component is provided on one side of the preheating component.

[0007] The preheating assembly includes a hopper, a heating chamber shell, a hot air duct, a blower, a bearing ring, a venturi tube, fan blades, and a drying trough. The hopper is fixedly installed on the side of the drying duct away from the hopper and is connected to the drying duct. The heating chamber shell is fixedly installed at the bottom of the hopper. A hot air duct is connected to one side of the heating chamber shell. A blower is installed on one side of the hot air duct. The bearing ring is fixedly installed inside the drying duct. A venturi tube is movably installed on one side of the bearing ring. Fan blades are fixedly connected to the neck of each venturi tube. A drying trough is opened in the neck of each venturi tube between adjacent fan blades. A breathable mesh is fixedly installed inside the neck of each venturi tube.

[0008] The above scheme establishes a multi-stage hot air circulation system, which uses a tapered air inlet and an inclined air outlet to form a directional airflow. Combined with the vortex effect generated by the rotating fan blades, it significantly improves the heat exchange efficiency of fibrous materials.

[0009] Optionally, the preheating assembly further includes an electric heating tube, a hot melt tube, an air inlet, and an air outlet. The electric heating tube is fixedly installed inside the heating chamber shell. A hot melt tube is provided on one side of the electric heating tube. The hot melt tube is connected to the feeding hopper and the extrusion chamber of the cold pressing forming assembly, respectively. The air inlet is opened on the side of the hot air pipe near the heating chamber shell. The air outlet is opened on the side of the hot air pipe near the fan blade, and the air outlet angle of the air outlet is biased towards the fan blade.

[0010] Through the above scheme, the spiral electric heating tube and the heat-conducting fins form a three-dimensional heating network. The airflow distribution is optimized by the gradually narrowing design of the air holes, so as to achieve precise control of heat energy and low energy consumption operation.

[0011] Optionally, one end of the bottom of the drying pipe is connected to the hot air pipe, and the other end of the bottom of the drying pipe is connected to the feeding hopper. The cold pressing forming assembly includes an extrusion chamber shell and a booster pump, wherein the extrusion chamber shell is fixedly installed at the bottom of the heating chamber shell, the booster pump is located on one side of the extrusion chamber shell, and the top of the feeding pipe is connected to the bottom of the crusher.

[0012] The above scheme constructs a closed-loop hot air circulation path, combined with a booster pump to provide stable molding pressure, ensuring that the material completes densification and reconstruction under low temperature conditions.

[0013] Optionally, the heating tubes are spirally distributed along the axial direction of the heating chamber shell and form a heat exchange channel with the hot air duct. The inner wall of the hot melt tube is provided with heat-conducting fins.

[0014] The above scheme extends the hot air contact time through the spiral heating tube layout, and the fin structure enhances the heat transfer effect of the melt, making the material temperature field distribution more uniform.

[0015] Optionally, the air inlet holes are evenly distributed around the hot air duct, with the hole diameter gradually decreasing from the end near the blower to the end of the fan blades, and the inclination angle of the air outlet slot is 15-45°.

[0016] The above scheme generates accelerated airflow through the tapered air inlet, which, together with the inclined air outlet, forms a swirling air curtain, effectively improving the rate of moisture evaporation on the fiber surface.

[0017] Optionally, the blade surface of the fan blade is provided with a flow guiding groove, and the ratio of the throat diameter of the venturi tube to the diameter of the drying tube is 1:2.5-3.5.

[0018] The above scheme enhances the airflow guidance effect of the flow guide groove, optimizes the venturi tube diameter ratio to achieve negative pressure gradient control, and promotes the fluidization of materials.

[0019] Optionally, the breathable mesh is made of high-temperature resistant ceramic fiber material, and the mesh density is distributed in a gradient decreasing distribution along the material travel direction.

[0020] The above solution uses a gradient permeable mesh to match the material state at different stages, and the ceramic material ensures high-temperature stability while taking into account both airflow permeability and material residence time control.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] 1. This utility model, by incorporating components such as electric heating tubes, venturi tubes, and fan blades, utilizes the heat exchange channel formed by the spiral distribution of the electric heating tubes and the hot air duct. This allows the hot air duct, through a blower, to guide high-temperature airflow into the heating chamber shell via the air inlet. The airflow is then accelerated at the throat of the venturi tube, and combined with the guide grooves on the fan blade surface, forms a rotating airflow, providing three-dimensional heating to the falling polyester fiber material. The drying groove at the neck of the venturi tube and the permeable mesh structure create a localized negative pressure zone, allowing the hot airflow to penetrate the material layer, achieving a highly efficient drying effect by rapidly reducing the material's moisture content from 20% to below 5%. Simultaneously, the 15-45° inclined design of the air outlet ensures that the airflow and material movement direction are opposed, extending the heat exchange time and improving energy utilization.

[0023] 2. This utility model, by incorporating components such as a hot-melt tube, a bearing ring, and a gradient permeable mesh, utilizes the synergistic heating of the heat-conducting fins on the inner wall of the hot-melt tube and the electric heating tube to achieve initial softening of the material during transport. The Venturi tube supported by the bearing ring can rotate with the airflow, and its throat diameter of 1:2.5-3.5, combined with a contraction and expansion structure, achieves a dual function of material dispersion and directional transport. The permeable mesh employs a high-temperature resistant ceramic fiber gradient pore design; the high-density mesh at the front end blocks large particles, while the low-density mesh at the rear end ensures airflow penetration, achieving particle size classification and uniform heating of the material. This structure allows the material to reach a softening temperature of 80-120℃ during the preheating stage, reducing energy consumption by more than 30% compared to traditional processes. Simultaneously, it provides a stable material state for subsequent cold pressing, ensuring that the density deviation of the finished product is controlled within ±0.05g / cm³. 3 Within the range. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0025] Figure 2 This is a partial structural diagram of an embodiment of this application;

[0026] Figure 3 This is a partial structural diagram of the preheating component in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the partial structure installation of the preheating component in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram showing the disassembled parts of the preheating component in an embodiment of this application.

[0029] Reference numerals: 1. Feeding pipe; 2. Drying pipe; 3. Preheating assembly; 301. Feeding hopper; 302. Heating chamber shell; 303. Hot air pipe; 304. Blower; 305. Bearing ring; 306. Venturi tube; 307. Fan blade; 308. Drying tank; 309. Electric heating tube; 310. Hot melt tube; 311. Air inlet; 312. Air outlet; 4. Cold pressing assembly. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a near-low temperature forming apparatus for continuous production of waste polyester fibers.

[0032] Please see Figure 1 A near-low temperature forming device for continuous production of waste polyester fiber includes a feeding pipe 1, a drying pipe 2 connected to the bottom of the feeding pipe 1, a preheating component 3 at the bottom of the drying pipe 2, and a cold pressing forming component 4 on one side of the preheating component 3.

[0033] Please see Figures 2 to 5 The preheating component 3 includes a hopper 301, a heating chamber shell 302, a hot air pipe 303, a blower 304, a bearing ring 305, a venturi tube 306, a fan blade 307, and a drying trough 308. The hopper 301 is fixedly installed on the side of the drying pipe 2 away from the hopper 1 and is connected to the drying pipe 2. The heating chamber shell 302 is fixedly installed at the bottom of the hopper 301, and one side of the heating chamber shell 302 is connected to a hot air pipe. A blower 304 is installed on one side of the air duct 303 and the hot air duct 303. A bearing ring 305 is fixedly installed inside the drying pipe 2. A venturi tube 306 is movably installed on one side of the bearing ring 305. A fan blade 307 is fixedly connected to the neck of each venturi tube 306. A drying groove 308 is opened in the neck of each venturi tube 306. The drying groove 308 is opened between adjacent fan blades 307. A breathable mesh is fixedly installed inside the neck of the venturi tube 306.

[0034] The preheating component 3 also includes an electric heating tube 309, a hot melt tube 310, an air inlet 311, and an air outlet 312. The electric heating tube 309 is fixedly installed inside the heating chamber shell 302. A hot melt tube 310 is provided on one side of the electric heating tube 309. The hot melt tube 310 is connected to the feeding hopper 301 and the extrusion chamber of the cold pressing forming component 4, respectively. The air inlet 311 is opened on the side of the hot air pipe 303 near the heating chamber shell 302. The air outlet 312 is opened on the side of the hot air pipe 303 near the fan blade 307, and the air outlet angle of the air outlet 312 is biased towards the fan blade 307.

[0035] One end of the bottom of the drying pipe 2 is connected to the hot air pipe 303, and the other end of the bottom of the drying pipe 2 is connected to the feeding hopper 301. The cold pressing forming assembly 4 includes an extrusion chamber shell and a booster pump. The extrusion chamber shell is fixedly installed at the bottom of the heating chamber shell 302, and the booster pump is located on one side of the extrusion chamber shell. The top of the feeding pipe 1 is connected to the bottom of the crusher.

[0036] The heating element 309 is spirally distributed along the axial direction of the heating chamber shell 302 and forms a heat exchange channel with the hot air pipe 303. The inner wall of the hot melt pipe 310 is provided with heat-conducting fins.

[0037] The air inlet 311 is evenly distributed around the hot air pipe 303, and the diameter of the inlet gradually decreases from the end near the blower 304 to the end of the fan blade 307. The inclination angle of the air outlet slot 312 is 15-45°.

[0038] The blade surface of the fan blade 307 is provided with a flow guiding groove, and the ratio of the throat diameter of the venturi tube 306 to the diameter of the drying tube 2 is 1:2.5-3.5.

[0039] The breathable mesh is made of high-temperature resistant ceramic fiber material, and the mesh density decreases in a gradient along the direction of material movement.

[0040] Further explanation is needed: the preheating component 3 is the core pretreatment unit of the entire waste polyester fiber near-low temperature forming device. Its core function is to achieve efficient drying and gradient preheating of the material. Through the synergistic effect of the spirally distributed electric heating tubes 309 and the Venturi tubes 306, this component combines high-temperature airflow with mechanical stirring, reducing the material moisture content from 20% to below 5% within 3-5 seconds. The specific working process is as follows: the blower 304 heats the air to 300-400℃, and then accelerates the airflow speed to 15-25m / s through the gradually narrowing air inlet 311. The airflow forms a critical velocity jet at the throat of the Venturi tube 306, which, together with the guide groove of the rotating fan blades 307, generates a spiral airflow. This creates a local negative pressure in the drying tank 308 area, allowing the hot airflow to penetrate the material layer vertically. This three-dimensional heating method improves the efficiency by 40% compared to the traditional drum drying method. At the same time, the gradient permeable mesh with a front end of 100-150 mesh and a rear end of 30-50 mesh achieves material particle size classification and uniform heating.

[0041] The preheating component 3 achieves dynamic material dispersion and energy-saving preheating through innovative mechanical structure. The Venturi tubes 306 supported by the bearing ring 305 can rotate with the airflow. The 2.5-3.5 contraction-expansion ratio of their throat diameter to the drying tube 21 creates a Venturi effect, generating material dispersion force while accelerating the airflow. The rotating fan blades 307 convert the axial airflow into spiral propulsion force, preventing material agglomeration. The heat-conducting fins on the inner wall of the hot melt tube 310 and the electric heating tube 309 work together to gradually heat the material to a softening temperature of 80-120℃ during the conveying process, reducing energy consumption by more than 35% compared to the traditional high-temperature melting process. This near-low temperature preheating technology not only preserves the physical properties of the fibers but also provides a stable material state for the subsequent cold pressing molding component 4, ensuring that the density deviation of the product is controlled within ±0.05g / cm³. 3 Within the specified range, the heat exchange design in the closed system controls the exhaust gas temperature below 60°C, achieving the dual goals of waste heat recovery and environmentally friendly emissions.

[0042] The implementation principle of a near-low temperature forming device for continuous production of waste polyester fiber according to an embodiment of this application is as follows:

[0043] First, in the raw material pretreatment stage, the waste polyester fiber is crushed by a crusher and then enters the drying pipe 2 through the feed pipe 1. The particle size of the crushed fiber is controlled at 3-5mm and the moisture content is about 20%, which provides a uniform material basis for subsequent processing.

[0044] Secondly, in the preliminary drying stage, the hot air pipe 303 connected to the bottom of the drying pipe 2 heats the ambient air generated by the blower 304 to 150-200℃, and further heats it to 300-400℃ through the spirally distributed electric heating tubes 309. The hot airflow is accelerated to the critical flow velocity Mach number of 0.8-1.2 through the throat of the Venturi tube 306, forming a high-speed rotating airflow field in the drying pipe 2, which performs preliminary gas-solid heat exchange on the falling material, reducing the moisture content to 10%-15%.

[0045] Next, in the gradient preheating stage, the material enters the heating chamber shell 302 of the preheating component 3. At this time, the Venturi tube 306 rotates with the airflow under the support of the bearing ring 305. The 1:2.5-3.5 contraction and expansion structure of its throat forms a local negative pressure zone. The flow guide groove on the surface of the rotating fan blade 307 converts the airflow into a spiral propulsion force. Combined with the 15-45° inclined air outlet slot 312, the material undergoes three stages of heating within 3-5 seconds: ① Hot airflow penetrates the gradient holes of the breathable ceramic fiber mesh for surface heating; ② Heat conduction is achieved through the heat-conducting fins of the hot melt tube 310; ③ Radiation heating is achieved through the electric heating tube 309. The material softening temperature is stabilized at 80-120℃, and the density uniformity is improved to ±0.03g / cm³. 3 .

[0046] In the next stage, the cold pressing process, the softened material enters the extrusion chamber shell through the hot melt pipe 310. A booster pump applies a pressure of 80-120 MPa, while circulating cooling water controls the mold temperature at 40-60°C. Under shear stress and rapid cooling, the fiber molecular chains rearrange to form a dense structure, resulting in a product density of 1.2-1.3 g / cm³. 3 The tensile strength is increased by 18% compared to the traditional process.

[0047] Finally, in the waste heat recovery stage, the system uses a double-layer heat exchange design between the hot air duct 303 and the heating chamber shell 302 to reduce the exhaust gas temperature from 300℃ to below 60℃. The recovered heat is used to preheat the intake air of the blower 304. The cooled and dried exhaust gas is filtered by activated carbon and then discharged in compliance with standards. The energy consumption of the entire process is reduced by 42% compared with the traditional high-temperature melting process, realizing closed-loop clean production.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A continuous production of waste polyester fiber near low temperature forming device, comprising a feeding pipe (1), characterized in that: The bottom of the blanking pipe (1) is communicated with a drying pipe (2), the bottom of the drying pipe (2) is provided with a preheating assembly (3), one side of the preheating assembly (3) is provided with a cold pressure forming assembly (4); The preheating assembly (3) comprises a blanking hopper (301), a heating cavity shell (302), a hot air pipe (303), a blower (304), a bearing ring (305), a Venturi tube (306), a fan blade (307) and a drying groove (308), the blanking hopper (301) is fixedly installed on one side of the drying pipe (2) away from the blanking pipe (1), the blanking hopper (301) is communicated with the drying pipe (2), the bottom of the blanking hopper (301) is fixedly installed with the heating cavity shell (302), one side of the heating cavity shell (302) is communicated with the hot air pipe (303), one side of the hot air pipe (303) is provided with the blower (304), the bearing ring (305) is fixedly installed in the inside of the drying pipe (2), one side of the bearing ring (305) is movably installed with the Venturi tube (306), the neck of the Venturi tube (306) is fixedly connected with the fan blade (307), the neck of the Venturi tube (306) is provided with the drying groove (308), the drying groove (308) is arranged between adjacent fan blades (307), and the inside of the neck of the Venturi tube (306) is fixedly installed with a breathable net.

2. A continuous production of waste polyester fiber near low-temperature forming device according to claim 1, characterized in that: The preheating assembly (3) further comprises an electric heating tube (309), a hot melting pipe (310), an air inlet hole (311) and an air outlet groove (312), the electric heating tube (309) is fixedly installed in the inside of the heating cavity shell (302), one side of the electric heating tube (309) is provided with the hot melting pipe (310), the hot melting pipe (310) is respectively communicated with the blanking hopper (301) and the extrusion cavity of the cold pressure forming assembly (4), the air inlet hole (311) is arranged on one side of the hot air pipe (303) close to the heating cavity shell (302), and the air outlet groove (312) is arranged on one side of the hot air pipe (303) close to the fan blade (307), and the air outlet angle of the air outlet groove (312) is inclined to the fan blade (307).

3. The continuous production of waste polyester fiber near low-temperature forming device according to claim 2, characterized in that: One end of the bottom of the drying pipe (2) is communicated with the hot air pipe (303), the other end of the bottom of the drying pipe (2) is communicated with the blanking hopper (301), the cold pressure forming assembly (4) comprises an extrusion cavity shell and a booster pump, wherein the extrusion cavity shell is fixedly installed at the bottom of the heating cavity shell (302), and the booster pump is arranged on one side of the extrusion cavity shell, and the top of the blanking pipe (1) is communicated with the bottom of the crusher.

4. The continuous production of waste polyester fiber near low-temperature forming device according to claim 3, characterized in that: The electric heating tube (309) is spirally distributed along the axial direction of the heating cavity shell (302) and forms a heat exchange channel with the hot air pipe (303), and the inner wall of the hot melting pipe (310) is provided with heat conduction fins.

5. A continuous production of waste polyester fiber near low-temperature forming device according to claim 2, characterized in that: The air inlet hole (311) is uniformly distributed along the circumferential direction of the hot air pipe (303), the hole diameter is gradually reduced from the end close to the blower (304) to the end close to the fan blade (307), and the inclination angle of the air outlet groove (312) is 15-45°.

6. The continuous production of waste polyester fiber near low-temperature forming device according to claim 1, characterized in that: The vane surface of the fan blade (307) is provided with a flow guide groove, and the ratio of the throat diameter of the Venturi tube (306) to the diameter of the drying tube (2) is 1:2.5-3.

5.

7. The continuous production of waste polyester fiber near low-temperature forming device according to claim 1, characterized in that: The air-permeable net is made of high-temperature-resistant ceramic fiber material, and the mesh density is distributed in a gradient decreasing manner along the material running direction.

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