Device for photolytic removal of initiators from 3d-printed waste photopolymer

Abstract

The utility model discloses a 3D printing waste light solidification plastics photolysis removes initiator device outer cylinder, central light source, guide cylinder, lower blow pipe, upper blow pipe, filter component, the central light source sets up at the outer cylinder central place, including light source cylinder, a plurality of light source fluorescent tube, the reflection piece, is provided with the guide cylinder between light source cylinder outside and the outer cylinder inner wall, and lower blow pipe passes through the outer cylinder and is set up in the guide cylinder lower part of guide cylinder, lower blow pipe includes the gas pipe section, annular distribution pipe the utility model provides a kind of 3D printing waste light solidification plastics photolysis removes initiator device for the waste light solidification plastics particle after crushing processing, realizes the agitation to granular material using air floatation mode, cooperate central light source to realize its photolysis operation. Through the optimization of the internal guide cylinder combined to blow gas device, the cyclic agitation of granular material can be realized. Central light source uses multiple fluorescent tubes, cooperate reflection piece, while maintaining the light intensity in subsequent use process.

Description

Technical Field

[0001] This utility model relates to the field of solid waste treatment technology, specifically to a device for photolytic removal of initiators from 3D printed waste photocurable plastics. Background Technology

[0002] In 3D printing photopolymerization technology, photoinitiators are the core component. Their main function is to generate active free radicals or cations by absorbing specific wavelengths of light energy (such as ultraviolet or visible light), triggering the polymerization reaction of resin monomers and prepolymers, thereby forming a cross-linked network structure. Acylphosphine oxides (TPO, 819) are the most common initiators due to their advantages such as high efficiency, environmental friendliness, and broad-spectrum absorption characteristics. The recycling of photopolymerized plastics made from acylphosphine oxides (such as TPO, 819) faces the following main problems: Photopolymerized plastics are difficult to melt or dissolve due to their three-dimensional cross-linked network structure. Traditional physical recycling methods (such as crushing and melting) are insufficient to restore the original properties of the material, while chemical decomposition requires strong acids, strong oxidants, or high temperatures, easily generating harmful byproducts (such as benzaldehyde and benzene ring-containing VOCs). Photoinitiators such as TPO and their photolysis products (such as quinone structures) may migrate into the environment during recycling, posing risks of cytotoxicity and ecotoxicity. Incineration also releases harmful substances such as benzophenone.

[0003] There are currently no mature processes or equipment for the recycling and reuse of this type of waste photocurable plastics. Pyrolysis and photolysis are the main technological directions being explored by academia and industry. For example, the authorized invention patent CN116218566B, "A Method for Coupled Treatment of Photocurable Waste by Photo-oxidation and Catalytic Pyrolysis," discloses a method for coupled treatment of photocurable waste by photo-oxidation and catalytic pyrolysis, stating that "treatment of photocurable waste by photo-oxidation can effectively remove harmful photoinitiators from the photocurable waste, thereby reducing the energy consumption of subsequent pyrolysis and affecting the composition of pyrolysis products, thus improving the quality of pyrolysis oil." This patent does not cover equipment related to photolysis for removing initiators. Currently, photolysis equipment is mainly used in the fields of wastewater and waste gas treatment. Summary of the Invention

[0004] The purpose of this invention is to provide a device for photolytic removal of initiators from waste photocurable plastics in 3D printing, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a device for removing initiators from waste photocurable plastics in 3D printing, comprising an outer cylinder, a central light source, a guide cylinder, a lower air pipe, an upper air pipe, and a filter assembly; the outer cylinder is a hollow rotary cavity structure with an inlet at the top and an outlet at the bottom; the central light source is located at the center of the outer cylinder and includes a light source tube, several light source tubes, and a reflector; a guide cylinder is provided between the outer side of the light source tube and the inner wall of the outer cylinder, and the lower air pipe passes through the outer cylinder and the guide cylinder and is located at the lower part of the guide cylinder, the lower air pipe including an air pipe section and an annular distribution pipe.

[0006] Furthermore, it also includes an upper air blowing pipe, which is disposed at the top of the outer cylinder, in the area between the guide cylinder and the outer cylinder.

[0007] Furthermore, the light source tube is located in the center of the outer cylinder and has a transparent cylindrical structure with a closed lower part. The light source tube is located inside the light source tube and is an ultraviolet lamp tube. The upper part of the light source tube is provided with an openable and closable cover. Multiple light source tubes are arranged in a circumferential array. A reflector is provided in the middle area of ​​multiple light source tubes. The reflector is projected into an irregular shape on the horizontal plane, including arc segments corresponding to the number of light source tubes, and multiple arc segments are arranged in a circumferential array.

[0008] Furthermore, the filter assembly includes an air inlet pipe, a filter barrel, and an air outlet pipe. The filter barrel is connected to the internal cavity of the outer cylinder through the air inlet pipe and is located at the upper part of the outer cylinder. Several inclined filter screens are arranged inside the filter barrel. An air outlet pipe is provided at the top of the filter barrel.

[0009] Furthermore, the filter assembly also includes a return pipe, with the bottom of the filter barrel connected to the return pipe, and the other end of the return pipe passing through the lower part of the outer cylinder and connected to the internal cavity of the outer cylinder.

[0010] Furthermore, a guide arc surface is provided at the top of the light source tube, the lower diameter of the guide arc surface is smaller than the top diameter, and the top diameter is larger than the diameter of the guide tube; an arc protrusion is provided at the bottom of the light source tube.

[0011] Furthermore, the annular distribution tube includes multiple concentric annular tubes of different diameters, and the multiple annular tubes are connected to the tracheal segment.

[0012] Furthermore, at least one intermediate guide section is provided on the inner wall of the guide cylinder. The intermediate guide section includes a lower guide surface and an upper guide surface. The lower guide surface is annular, with its lower end fixed to the inner wall of the guide cylinder and its upper part inclined towards the axis of the guide cylinder. The upper part is connected to the lower part of the upper guide surface. The upper guide surface is annular, with its upper end fixed to the inner wall of the guide cylinder.

[0013] This invention proposes a 3D printing waste photocurable plastic initiator removal device. For pulverized waste photocurable plastic particles, it employs an air flotation mode to agitate the particles, combined with a central light source to perform the photolysis process. By optimizing the air blowing device and integrating it with the internal guide cylinder, the granules can be circulated and agitated. The central light source uses multiple lamps and reflectors, ensuring light intensity while facilitating maintenance during subsequent use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall scheme of one embodiment of the present utility model.

[0015] Figure 2 This is a cross-sectional schematic diagram of one embodiment of the present invention.

[0016] Figure 3 This is an enlarged schematic diagram of the central light source area of ​​this utility model.

[0017] Figure 4 This is a partial cross-sectional schematic diagram of another embodiment of the present invention.

[0018] Figure 5 This is a partial cross-sectional schematic diagram of another embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] As attached Figure 1-4 As shown, the device for removing initiators from waste photocurable plastics in 3D printing involved in this utility model includes an outer cylinder 1, a central light source 2, a guide cylinder 3, a lower air pipe 4, an upper air pipe 5, and a filter assembly 6.

[0021] The outer cylinder 1 is a hollow rotary cavity structure with an inlet 11 at the top and an outlet 12 at the bottom. The inlet 11 and outlet 12 are openable and closable structures.

[0022] As attached Figure 1 , 3As shown, the central light source 2 is located in the center of the outer cylinder 1, and includes a light source tube 21, several light source tubes 22, and a reflector 23. The light source tube 21 is a transparent cylindrical structure with a closed lower part, and the light source tubes 22 are ultraviolet lamps located inside the light source tube 21. The upper part of the light source tube 21 is provided with an openable cover for connecting the light source tubes 22 and wires. The multiple light source tubes 22 are arranged in a circumferential array, and a reflector 23 is provided in the middle area of ​​the multiple light source tubes 22 to reflect the light emitted by the tubes into the outer cylinder 1. The reflector 23 is projected into an irregular shape on the horizontal plane, including arc segments corresponding to the number of light source tubes 22, and multiple arc segments are arranged in a circumferential array.

[0023] A guide tube 3 is provided between the outer side of the light source tube 21 and the inner wall of the outer tube 1. The down-blowing air pipe 4 passes through the outer tube 1 and the guide tube 3 and is located at the lower part of the guide tube 3. The down-blowing air pipe 4 includes an air pipe section 41 and an annular distribution pipe 42. Multiple air outlets are provided on the annular distribution pipe 42 to achieve uniform air output.

[0024] There are multiple air-blowing pipes 5, two of which are shown in the attached diagram. They are located on the top of the outer cylinder 1, in the area between the guide cylinder 3 and the outer cylinder 1.

[0025] By setting up the lower air pipe 4 and the upper air pipe 5, plastic particles can be circulated from top to bottom inside the guide cylinder 3, and from top to bottom between the guide cylinder 3 and the outer cylinder 1.

[0026] Furthermore, the filter assembly 6 includes an inlet pipe 60, a filter canister 61, a return pipe 62, and an outlet pipe 63. The filter canister 61 is connected to the internal cavity of the outer cylinder 1 via the inlet pipe 60 and is located at the upper part of the outer cylinder 1. Several inclined filter screens 64 are arranged inside the filter canister 61. The bottom of the filter canister 61 is connected to the return pipe 62, and the other end of the return pipe 62 passes through the lower part of the outer cylinder 1 and connects to the internal cavity of the outer cylinder 1. An outlet pipe is provided at the top of the filter canister 61. The filter assembly is used to filter the gas inside the outer cylinder 1 before it flows out, while simultaneously preventing the escape of plastic particles.

[0027] As attached Figure 4 As shown, the guide cylinder 3 is fixedly connected to the inner wall of the outer cylinder 1 by several connecting rods 31.

[0028] A guide arc-shaped portion 32 is provided at the top of the light source tube 21. The lower diameter of the guide arc-shaped portion 32 is smaller than that at the top, and the top diameter is larger than that of the guide tube 3. An arc-shaped protrusion 33 is provided at the bottom of the light source tube 21.

[0029] The purpose of the guide arc surface 32 and the arc protrusion 33 is to reduce the resistance that plastic particles may encounter during the air flotation circulation process.

[0030] To further improve the air flotation effect, as shown in the attached document... Figure 5 As shown, the annular distribution tube includes multiple concentric annular tubes 421 of different diameters, and the multiple annular tubes are connected to the tracheal section 41.

[0031] To reduce the rapid upward movement of plastic particles along the inner wall of the guide cylinder 3, at least one intermediate guide section 34 is provided on the inner wall of the guide cylinder 3. The intermediate guide section 34 includes a lower guide surface 341 and an upper guide surface 342. The lower guide surface 341 is annular, with its lower end fixed to the inner wall of the guide cylinder 3, and its upper part inclined towards the axis of the guide cylinder 3. The upper part is connected to the lower part of the upper guide surface 342. The upper guide surface 342 is annular, with its upper end fixed to the inner wall of the guide cylinder 3. The lower guide surface 341 and the upper guide surface 342 form a circular transition.

[0032] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A device for photolytic removal of initiators from waste photocurable plastics from 3D printing, characterized in that, It includes an outer cylinder, a central light source, a guide cylinder, a lower air pipe, an upper air pipe, and a filter assembly; the outer cylinder is a hollow rotating cavity structure with a feed inlet at the top and a discharge outlet at the bottom; the central light source is located in the center of the outer cylinder and includes a light source tube, several light source tubes, and a reflector; a guide cylinder is provided between the outer side of the light source tube and the inner wall of the outer cylinder, and the lower air pipe passes through the outer cylinder and the guide cylinder and is located at the lower part of the guide cylinder, the lower air pipe including an air pipe section and an annular distribution pipe.

2. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 1, characterized in that, It also includes an upper air blowing pipe, which is located at the top of the outer cylinder, in the area between the guide cylinder and the outer cylinder.

3. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 1, characterized in that, The light source tube is located in the center of the outer cylinder and is a transparent cylindrical structure with a closed bottom. The light source tubes are ultraviolet lamps and are located inside the light source tube. The upper part of the light source tube is provided with an openable and closable cover. Multiple light source tubes are arranged in a circumferential array. A reflector is provided in the middle area of ​​the multiple light source tubes. The reflector is projected into an irregular shape on the horizontal plane, including arc segments corresponding to the number of light source tubes, and multiple arc segments are arranged in a circumferential array.

4. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 1, characterized in that, The filter assembly includes an air inlet pipe, a filter barrel, and an air outlet pipe. The filter barrel is connected to the internal cavity of the outer cylinder through the air inlet pipe and is located at the upper part of the outer cylinder. Several inclined filter screens are arranged inside the filter barrel. An air outlet pipe is provided at the top of the filter barrel.

5. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 4, characterized in that, The filter assembly also includes a return pipe, with the bottom of the filter barrel connected to the return pipe, and the other end of the return pipe passing through the lower part of the outer cylinder and connected to the internal cavity of the outer cylinder.

6. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 1, characterized in that, A guide arc section is provided at the top of the light source tube, with the lower diameter of the guide arc section being smaller than that at the top and the top diameter being larger than that of the guide tube; an arc protrusion is provided at the bottom of the light source tube.

7. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 1, characterized in that, The annular distribution tube includes multiple concentric annular tubes of different diameters, and the multiple annular tubes are connected to the tracheal segment.

8. The device for photolytic removal of initiators from waste photocurable plastics from 3D printing according to claim 6, characterized in that, At least one intermediate guide section is provided on the inner wall of the guide cylinder. The intermediate guide section includes a lower guide surface and an upper guide surface. The lower guide surface is annular, with its lower end fixed to the inner wall of the guide cylinder and its upper part inclined toward the axis of the guide cylinder. The upper part is connected to the lower part of the upper guide surface. The upper guide surface is annular, with its upper end fixed to the inner wall of the guide cylinder.

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