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CN-122006912-A - Polyester waste closed-loop recycling device and method

CN122006912ACN 122006912 ACN122006912 ACN 122006912ACN-122006912-A

Abstract

The invention relates to a closed-loop recycling device and method for polyester waste, and belongs to the technical field of polyester waste recycling. The device comprises a tank body, wherein a lifting centrifugal cylinder is arranged in the tank body, a round discharge hole is formed in the lower end of the centrifugal cylinder, a balance heating mechanism and an output shaft with a clutch mechanism are arranged in the centrifugal cylinder, and a jacking mechanism comprising a telescopic cylinder, a sealing cylinder and a jacking column is arranged at the lower part of the tank body, wherein the sealing cylinder is in sliding fit with the round discharge hole. The invention realizes three functions by lifting the lifting mechanism, namely, lifting upwards to enable the clutch mechanism to be connected with an external power source, realizing power sharing of upper and lower equipment, greatly reducing energy consumption, realizing bottom blocking and opening by matching the sealing cylinder with the circular discharge hole, thoroughly solving the problem that solid impurities cannot be discharged from above when the reaction kettle is directly connected with the separation kettle below, and realizing dynamic sealing by utilizing the spiral groove, thereby avoiding abrasion of high-viscosity materials. The closed loop recycling device is compact in structure and effectively improves the closed loop recycling efficiency of polyester waste.

Inventors

  • BA YUESHENG
  • WU YUPING
  • GUO FENG
  • WANG JIAXING
  • WANG XI
  • Sheng Ranchao
  • LIU TIEGANG

Assignees

  • 山东产研中科高端化工产业技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (9)

  1. 1. A closed loop recycling device for polyester waste, comprising: The novel centrifugal tank comprises a tank body (1), wherein a centrifugal cylinder (2) capable of lifting along the axial direction of the tank body is arranged in the tank body (1), and a circular discharge hole (21) is formed in the lower end of the centrifugal cylinder (2); the balance heating mechanism (3) is arranged inside the centrifugal cylinder (2) and synchronously rises and falls along with the centrifugal cylinder (2); the lower end of the output shaft (4) is in transmission connection with the balance heating mechanism (3), and the upper end of the output shaft (4) is provided with a clutch mechanism (5) which is used for being in clutch connection with an input shaft (P1) of an external power source (P); The jacking mechanism (6) is arranged at the lower part of the tank body (1) and is used for driving a lifting assembly formed by the centrifugal cylinder (2), the balance heating mechanism (3) and the output shaft (4) to lift along the axial direction so as to enable the clutch mechanism (5) to be connected with or separated from the input shaft (P1) of the external power source (P); the jacking mechanism (6) comprises: A jacking frame (61) connected to the inner wall of the tank body (1); A telescopic cylinder (62) provided on the jack-up frame (61); The sealing cylinder (63) is connected to the output end of the telescopic cylinder (62), and the outer wall of the sealing cylinder (63) is in sliding fit with the circular discharge port (21); The jacking mechanism (6) further comprises a jacking column (64), wherein the jacking column (64) is arranged at the upper end of the sealing cylinder (63), an axial bearing (65) is arranged at the upper end of the jacking column (64), and when the telescopic cylinder (62) drives the sealing cylinder (63) to ascend, the upper end face of the axial bearing (65) on the jacking column (64) is abutted against the lower end face of the balance heating mechanism (3); The inner wall of the circular discharge hole (21) is provided with a spiral groove (211), and when the centrifugal cylinder (2) rotates, the spiral groove (211) is used for conveying media in a gap between the sealing cylinder (63) and the circular discharge hole (21) upwards to form dynamic seal.
  2. 2. The polyester waste closed loop recycling device according to claim 1, wherein the balance heating mechanism (3) comprises a mounting frame (31), a heating shell (32) is connected to the mounting frame (31), a heating source (33) is arranged inside the heating shell (32), and the output shaft (4) is in transmission connection with the mounting frame (31) through a spline or an involute key.
  3. 3. The polyester waste material closed loop recycling device according to claim 2, wherein an outer isolation cover (321) is arranged on the lower end face of the heating shell (32), an inner isolation cover (641) is connected to the outer surface of the jacking column (64), and the inner isolation cover (641) is arranged in the outer isolation cover (321) to form sliding connection.
  4. 4. The closed-loop recycling device for polyester waste according to claim 1, wherein an upper guide cylinder (611) is coaxially connected to the upper end of the jacking frame (61), and the inner wall of the sealing cylinder (63) is slidably connected with the upper guide cylinder (611).
  5. 5. The closed-loop recycling device for polyester waste according to claim 1, wherein an annular guide groove (34) is arranged on the lower end face of the balance heating mechanism (3), and the outer circumferential surface of the upper end of the axial bearing (65) is slidably sleeved in the annular guide groove (34).
  6. 6. The polyester waste closed loop recycling device according to claim 1, wherein a separation supporting cylinder (11) is arranged in the tank body (1), an annular supporting plate (22) is arranged at the lower end of the outer wall of the centrifugal cylinder (2), and the separation supporting cylinder (11) can form a support for the annular supporting plate (22).
  7. 7. The closed loop recycling apparatus of polyester waste material according to claim 6, wherein the outer periphery of the annular supporting plate (22) is provided with a drainage tube (23) extending downward.
  8. 8. A closed-loop recycling method for polyester waste, based on the closed-loop recycling device for polyester waste according to any one of claims 1-7, characterized in that, Comprising the following steps: S1, starting the jacking mechanism (6) until a clutch mechanism (5) at the upper end of the output shaft (4) is engaged with an input shaft (P1) of the external power source (P); S2, starting the external power source (P), and driving the centrifugal cylinder (2) to rotate through the input shaft (P1), the clutch mechanism (5) and the output shaft (4); S3, feeding the materials into the centrifugal barrel (2) for centrifugal separation; S4, stopping the external power source (P) after centrifugal separation is finished, driving the jacking mechanism (6) to enable the sealing cylinder (63) to descend, opening the circular discharge hole (21) and enabling solid impurities to fall, and separating the clutch mechanism (5) from the input shaft (P1).
  9. 9. The closed-loop recycling method of polyester waste according to claim 8, wherein in S3, the separated slurry enters a region between the centrifugal barrel (2) and the tank body (1), and the slurry continuously flows out of the discharge pipe.

Description

Polyester waste closed-loop recycling device and method Technical Field The invention relates to a closed-loop recycling device and method for polyester waste, and belongs to the technical field of polyester waste recycling. Background In the closed-loop recycling process of polyester waste, after the waste is screened and crushed, the material generally enters a core reaction tank and is reacted by an internal emulsifier and the like. The reacted mixture needs to enter a lower tank body for solid-liquid separation (usually centrifugal separation and purification). In the process of realizing the technical scheme of the application, the inventor finds that at least the following technical problems exist in the prior art: 1. the conventional bottom discharging structure faces the fatal problems of sealing and clamping under the working conditions of high temperature, high viscosity and easy solidification. In order to ensure process consistency and reduce material conveying heat losses, the core reaction tank is usually arranged directly above the separation tank, so that the separated solid impurities have to be taken out from below. Because the upper part of the centrifugal machine is occupied by the reaction kettle, the separated solid impurities cannot be taken out from the upper part, and a bottom discharging scheme is required. In the prior art, although there are a large number of centrifuges employing bottom movable discharge gates, flaps or bottom discharge structures, polyester waste has extremely high viscosity and is usually in a high temperature semi-molten state, containing hard solid particles. If the existing bottom discharging machine is directly used, the joint surface between the discharging door and the discharging hole is required to rely on the traditional contact type static seal (such as rubber rings and polytetrafluoroethylene gaskets) or mechanical seal. Under the continuous flushing of the high-speed rotation, high-viscosity and high-friction materials of the centrifugal machine, hard particles are extremely easy to clamp into a sealing gap, so that the contact type sealing piece is severely worn and torn in an extremely short time, and further serious leakage of the high-temperature materials is caused. Even more deadly, once the leaked high-viscosity polyester slurry invades into a rotary bearing or a jacking transmission part at the bottom, the high-viscosity polyester slurry can be hardened and solidified rapidly after cooling, so that the core moving part of the equipment is completely blocked, and further, the shutdown paralysis is caused, and the maintenance and the cleaning are extremely difficult. 2. Independent driving of upper and lower devices results in a bulky structure and extremely high energy consumption. The existing upper and lower two-stage equipment (an upper core reaction kettle and a lower centrifugal separator) are generally regarded as two independent mechanical units, and each must be equipped with an independent high-power driving motor and a matched speed reducing, transmitting and bearing assembly. The superposition of the double driving system not only causes high purchase cost of the whole equipment and excessive extrusion of the vertical installation space, but also causes extremely huge electric energy loss due to independent operation of the two heavy-duty power systems. In addition, the existence of multiple sets of transmission systems increases the mechanical failure rate and daily maintenance cost of the production line by times. Disclosure of Invention The invention aims to solve the technical problems that the prior art is overcome, the closed-loop recycling device and method for polyester waste are provided, and the problems that the existing equipment cannot realize bottom deslagging under the condition that a top reaction kettle is directly connected, the energy consumption is high due to a plurality of power sources, and the sealing reliability of a dynamic and static joint is poor under the high-viscosity environment are solved. The invention relates to a polyester waste material closed loop recycling device, which comprises: the centrifugal tank comprises a tank body, wherein a centrifugal cylinder capable of lifting along the axial direction of the tank body is arranged in the tank body, and a circular discharge hole is formed in the lower end of the centrifugal cylinder; the balance heating mechanism is arranged in the centrifugal cylinder and synchronously rises and falls along with the centrifugal cylinder; The lower end of the output shaft is in transmission connection with the balance heating mechanism, and the upper end of the output shaft is provided with a clutch mechanism for clutch connection with an input shaft of an external power source; The lifting mechanism is arranged at the lower part of the tank body and is used for driving a lifting assembly formed by the centrifugal cylinder, the balance heating mechanism and the ou