Pneumatic conveying system for resin easy to absorb moisture

Abstract

The utility model relates to a pneumatic conveying system for resin easy to absorb moisture, and belongs to the technical field of resin production conveying devices. The pneumatic conveying system comprises a protective gas source, a resin storage tank and a resin buffer tank, the gas outlet end of the protective gas source is divided into a first pneumatic conveying pipeline and a second pneumatic conveying pipeline, the first pneumatic conveying pipeline is communicated with the feeding end of the resin storage tank, and the second pneumatic conveying pipeline is communicated with the feeding end of the resin buffer tank; a first sliding pipe and a first pneumatic conveying pipeline are arranged at the discharging end of the resin drying device, and a second sliding pipe is connected to a discharging opening in the bottom end of the resin storage tank and connected with a second pneumatic conveying pipeline. According to the pneumatic conveying system designed by the utility model, the high-speed flowing shielding gas in the first pneumatic conveying pipeline and the second pneumatic conveying pipeline is used for conveying and transferring the resin easy to absorb moisture among the working sections, so that materials are isolated from the outside, and the resin is effectively prevented from absorbing moisture and being denatured in the conveying and transferring process.

Description

Technical Field

[0001] This utility model relates to the technical field of resin production and conveying devices, specifically to a pneumatic conveying system for easily hygroscopic resins. Background Technology

[0002] High-performance resins are a class of polymer materials that can maintain excellent mechanical, electrical, chemical resistance, and dimensional stability for a long time under extreme environments (high temperature, high pressure, high humidity, chemical corrosion, high load), and are the "invisible cornerstone" of modern high-end manufacturing. High-performance resins containing amide groups and ester bonds in their molecular chains (such as polycarbonate, nylon 66, polyester, etc.) are very sensitive to moisture and are extremely hygroscopic. In the production process of resin materials, high moisture content will have adverse effects on subsequent processes. For example, nylon 66 contains a large number of amide groups in its molecular chain, which are easily hydrolyzed in the molten state. Even a small amount of moisture can trigger degradation, leading to bubbles, breakage, fuzz, and difficulty in stretching during spinning. Therefore, moisture control is very important in the preparation, drying, and transportation of resins.

[0003] While existing resin drying technology is in a mature stage of development, the related technologies for each transportation stage after drying still need improvement. Currently, most resin materials are transported between production sections using methods such as screw conveyors. This transportation mode has a simple transfer device structure but low transportation efficiency, which affects production efficiency. At the same time, during the transportation process, the resin is exposed to the air, causing it to absorb moisture and oxidize, affecting its performance and reducing the resin's fiber-forming efficiency in subsequent stages, which is detrimental to the industrial development of high-performance resins.

[0004] In light of the above situation, there is an urgent need to propose a connection and conveying device for an industrial production system of easily hygroscopic resins to improve resin quality, ensure smooth transfer, and improve the quality of spinning raw materials. Summary of the Invention

[0005] To address the problems in the existing technology, this utility model patent designs a pneumatic conveying system for hygroscopic resins, in order to solve the problem that resins are prone to moisture absorption and denaturation during the transfer and conveying process in existing resin production systems.

[0006] The technical solution adopted by this utility model is as follows: the pneumatic conveying system includes a protective air source, the outlet of the protective air source is divided into a first pneumatic conveying pipeline and a second pneumatic conveying pipeline, the first pneumatic conveying pipeline is connected to the feed end of the resin storage tank, the second pneumatic conveying pipeline is connected to the feed end of the resin buffer tank of the resin preparation section, the discharge end of the resin drying device is provided with a first chute, the bottom end of the first chute is connected to the first pneumatic conveying pipeline, the discharge port at the bottom of the resin storage tank is connected to a second chute, and the bottom end of the second chute is connected to the second pneumatic conveying pipeline.

[0007] Furthermore, the bottom end of the first chute is inclined toward the conveying direction of the first pneumatic conveying pipeline, and the bottom end of the second chute is inclined toward the conveying direction of the second pneumatic conveying pipeline.

[0008] Furthermore, the protective gas source is connected to a protective gas buffer tank, and the outlet of the protective gas buffer tank is connected to the first pneumatic conveying pipeline and the second pneumatic conveying pipeline, respectively.

[0009] Furthermore, a first induced draft fan and a second induced draft fan are respectively installed on the first pneumatic conveying pipeline and the second pneumatic conveying pipeline.

[0010] Furthermore, the top of the resin storage tank and the resin buffer tank are respectively provided with air outlets, and the air outlets of the two are connected to the protective gas buffer tank through a return air pipeline, and a third induced draft fan is provided on the return air pipeline.

[0011] Furthermore, dust collectors are installed at the air outlets of the resin storage tank and the resin buffer tank, and the air outlets of the dust collectors are connected to the return air pipeline.

[0012] Furthermore, a heat exchanger is also installed on the return gas pipeline.

[0013] Furthermore, the dust collector is a bag filter dust collector, which uses a protective gas as the backflushing gas, and the protective gas is one or more of nitrogen, helium, argon, and carbon dioxide.

[0014] Compared to existing technologies, the advancements of this utility model patent's pneumatic conveying system for hygroscopic resins lie in the following: A first pneumatic conveying pipeline transfers the resin material from the discharge end of the drying unit to the resin storage tank; a second pneumatic conveying pipeline transfers the resin material from the resin storage tank to the resin buffer tank in the subsequent process section. Under the pressure of the first and second induced draft fans, the protective gas in both pipelines forms a high-speed airflow. As it flows through each discharge end, a negative pressure is created in the corresponding chute, drawing the resin material into the pneumatic conveying pipeline and transferring it to the corresponding storage tank. The entire resin conveying process does not involve contact with outside air, effectively preventing the resin from absorbing moisture and deteriorating during transport. Furthermore, the high airflow velocity in the pneumatic conveying pipeline significantly increases the resin material conveying speed, thereby improving production efficiency. The protective gas discharged from the top outlets of the resin storage tank and resin buffer tank is recycled back into the protective gas buffer tank through a return gas pipeline after dust removal and filtration, achieving the recycling of the protective gas and reducing production costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a pneumatic conveying system for hygroscopic resins.

[0016] In the diagram, 1-protective gas buffer tank, 101-first induced draft fan, 102-second induced draft fan, 2-resin storage tank, 3-resin buffer tank, 4-third induced draft fan, 5-heat exchanger, 6-bag filter dust collector, 7-first chute, 8-second chute. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, this utility model patent designs an embodiment of a pneumatic conveying system for easily hygroscopic resin. In this embodiment, the pneumatic conveying system includes a protective gas source, and the protective gas is one or more of nitrogen, helium, argon, and carbon dioxide. The outlet of the protective gas source is connected to a protective gas buffer tank 1 via a valve pipeline. The outlet of the protective gas buffer tank 1 branches into two parallel pipelines, namely a first pneumatic conveying pipeline and a second pneumatic conveying pipeline. The first pneumatic conveying pipeline is connected to the inlet of the resin storage tank 2, and the second pneumatic conveying pipeline is connected to the inlet of the resin buffer tank 3 in the resin preparation section. A first induced draft fan 101 and a second induced draft fan 102 are respectively installed on the first and second pneumatic conveying pipelines. The induced draft fans pressurize the protective gas in the two pneumatic conveying pipelines, thereby increasing the flow rate of the protective gas in the pneumatic conveying pipelines.

[0019] The discharge end of the drying unit in the resin drying section is connected to a first chute 7 via a rotary discharge valve. The bottom end of the first chute 7 is connected to a first pneumatic conveying pipeline and is inclined in the conveying direction of the first pneumatic conveying pipeline. The discharge port at the bottom of the resin storage tank 2 is connected to a second chute 8 via a rotary discharge valve. The bottom end of the second chute 8 is connected to a second pneumatic conveying pipeline and is inclined in the conveying direction of the second pneumatic conveying pipeline. Both chutes are created under negative pressure by high-speed airflow from their respective connected pneumatic conveying pipelines, allowing the discharged material to enter the resin storage tank 2 and the resin buffer tank 3 via the pneumatic conveying pipelines.

[0020] Both the resin storage tank 2 and the resin buffer tank 3 have air outlets at their tops, and bag filters 6 are installed at each outlet. The outlets of the two bag filters 6 are connected to the same return gas pipeline, which is connected to the protective gas buffer tank 1. After the material is transported in the resin storage tank 2 and the resin buffer tank 3, the gas discharged is filtered by its respective bag filter 6 and then returned to the protective gas buffer tank 1 through the return gas pipeline for recycling. A third induced draft fan 4 is installed on the return gas pipeline to provide power for the protective gas circulation. In addition, a heat exchanger 5 is installed on the return gas pipeline to exchange heat and cool the protective gas returning to the buffer tank.

[0021] When the pneumatic conveying system for hygroscopic resin disclosed in this utility model patent is applied, and it is necessary to transfer the dried resin material from the drying device to the resin storage tank, the protective gas buffer tank 1 is connected to the first pneumatic conveying pipeline, the first induced draft fan 101 is started, and a high-speed airflow is formed in the first pneumatic conveying pipeline. The rotary discharge valve of the drying device is opened, and the dried resin material will enter the first pneumatic conveying pipeline under the negative pressure of the first chute 7, and be transferred to the resin storage tank 2 with the protective gas. The protective gas that has completed the material conveying in the resin storage tank 2 is filtered by the bag filter 6 through the air outlet at the top of the tank and then recirculated back to the protective gas buffer tank 1 through the return air pipeline. The return air pipeline provides the power for the flow of protective gas from the third induced draft fan 4, and the heat exchanger 5 cools the returning protective gas. When it is necessary to transfer the resin material in resin storage tank 2 to resin buffer tank 3 in the subsequent resin liquid preparation section, the protective gas buffer tank 1 is connected to the second pneumatic conveying pipeline, the second induced draft fan 102 is started, and a high-speed protective airflow is formed in the second pneumatic conveying pipeline. The rotary discharge valve at the bottom of resin storage tank 2 is opened, and the resin material stored in resin storage tank 2 enters the second pneumatic conveying pipeline under the negative pressure of the second chute 8, and is conveyed into resin buffer tank 3 with the protective airflow. The protective gas that has completed the material conveying in resin buffer tank 3 is filtered by bag filter 9 through the air outlet at the top of the tank and then recirculated back to protective gas buffer tank 1 through the same path and process.

[0022] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A pneumatic conveying system for hygroscopic resin, characterized in that, The pneumatic conveying system includes a protective air source. The outlet of the protective air source branches into a first pneumatic conveying pipeline and a second pneumatic conveying pipeline. The first pneumatic conveying pipeline is connected to the feed end of the resin storage tank, and the second pneumatic conveying pipeline is connected to the feed end of the resin buffer tank in the resin preparation section. A first chute is provided at the discharge end of the resin drying device. The bottom end of the first chute is connected to the first pneumatic conveying pipeline. A second chute is connected to the discharge port at the bottom of the resin storage tank, and the bottom end of the second chute is connected to the second pneumatic conveying pipeline.

2. The pneumatic conveying system for hygroscopic resin according to claim 1, characterized in that, The bottom end of the first chute is inclined toward the conveying direction of the first pneumatic conveying pipeline, and the bottom end of the second chute is inclined toward the conveying direction of the second pneumatic conveying pipeline.

3. The pneumatic conveying system for hygroscopic resin according to claim 2, characterized in that, The protective gas source is connected to a protective gas buffer tank, and the outlet of the protective gas buffer tank is connected to the first pneumatic conveying pipeline and the second pneumatic conveying pipeline, respectively.

4. The pneumatic conveying system for hygroscopic resin according to claim 3, characterized in that, A first induced draft fan and a second induced draft fan are respectively installed on the first pneumatic conveying pipeline and the second pneumatic conveying pipeline.

5. The pneumatic conveying system for hygroscopic resin according to claim 4, characterized in that, The resin storage tank and the resin buffer tank are respectively provided with air outlets at their tops. The air outlets of the two tanks are connected to the protective gas buffer tank through a return air pipeline. A third induced draft fan is provided on the return air pipeline.

6. The pneumatic conveying system for hygroscopic resin according to claim 5, characterized in that, Dust collectors are installed at the air outlets of the resin storage tank and the resin buffer tank, and the air outlets of the dust collectors are connected to the return air pipeline.

7. The pneumatic conveying system for hygroscopic resin according to claim 6, characterized in that, A heat exchanger is also installed on the return gas pipeline.

8. The pneumatic conveying system for hygroscopic resin according to claim 7, characterized in that, The dust collector is a bag filter, which uses a protective gas as the backflushing gas. The protective gas is one or more of nitrogen, helium, argon, and carbon dioxide.

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