Raw material conveying system for field of recycled polyester

Abstract

The invention provides a raw material conveying system for the field of recycled polyester, which is characterized in that a blanking hopper A is connected with a feeding screw conveyor A, the feeding screw conveyor A is connected with an iron-removing slag-discharging mechanism A through a pipeline, the iron-removing slag-discharging mechanism A is connected with a main pipeline three-way reversing valve A through a pipeline, and the main pipeline three-way reversing valve A is connected with a main pipeline three-way reversing valve B through a pipeline. The main pipeline three-way reversing valve A is respectively connected with the bypass three-way reversing valve A and the conveying unit B through pipelines, the bypass three-way reversing valve A is respectively connected with the dust remover A and the metering bin A through pipelines, the dust remover A is connected with the metering bin A, and the metering bin A is connected with the rotary discharger A. According to the raw material conveying system for the field of recycled polyester, the negative pressure unit is arranged, the pressure of negative pressure airflow can be monitored and adjusted in real time, the problems of pipeline blockage or pipe emptying and the like are solved, and normal operation of production is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of negative pressure conveying systems, and in particular relates to a raw material conveying system for the field of recycled polyester. Background Technology

[0002] In modern industrial production, especially in industries such as chemicals, pharmaceuticals, and food, raw material transportation is a crucial link in the production process. Traditional raw material transportation methods suffer from low efficiency, high labor intensity, and poor safety. Therefore, negative pressure conveying systems, as a highly efficient, safe, and environmentally friendly material transportation method, have received widespread attention and application. Negative pressure conveying systems utilize negative pressure airflow to drive material movement, enabling long-distance, large-span, and multi-point material transportation, with advantages such as high conveying efficiency, low labor intensity, and good safety.

[0003] Existing negative pressure conveying systems lack effective monitoring and control systems, making it impossible to monitor and adjust the pressure of the negative pressure airflow in real time. This can easily lead to problems such as pipe blockage or empty pipes, affecting normal production. Furthermore, existing negative pressure conveying systems lack automatic alarms and emergency response measures when material blockage occurs, requiring manual intervention, which increases the burden on operators and safety risks. Most existing negative pressure conveying system pipelines are single-to-single; once the upstream end is blocked, the downstream system cannot operate normally. Manual feeding is also problematic; with increasing production capacity, the labor intensity for personnel is high, and the feeding area is small. Therefore, existing negative pressure conveying systems still have certain limitations in practical applications and require further improvement and optimization. Summary of the Invention

[0004] In view of this, the present invention aims to overcome the deficiencies in the prior art and propose a raw material conveying system for the field of recycled polyester.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A raw material conveying system for the recycled polyester industry includes a conveying unit A, a conveying unit B, and a negative pressure unit. The negative pressure unit is connected to both conveying units A and B via pipelines. Conveying unit A includes a discharge hopper A, a feeding screw conveyor A, an iron removal and slag discharge mechanism A, a main pipeline three-way reversing valve A, a bypass three-way reversing valve A, a dust collector A, a metering bin A, a rotary feeder A, and a discharge screw conveyor A. The discharge hopper A is connected to the feeding screw conveyor A, and the feeding screw conveyor A is connected to the iron removal and slag discharge mechanism via pipelines. The iron removal and slag discharge mechanism A is connected via pipeline to the main pipeline three-way reversing valve A. The main pipeline three-way reversing valve A is connected via pipeline to the bypass three-way reversing valve A and the conveying unit B. The bypass three-way reversing valve A is connected via pipeline to the dust collector A and the metering chamber A. The dust collector A is connected to the metering chamber A. The metering chamber A is connected to the rotary feeder A. The rotary feeder A is connected to the discharge screw conveyor A. The discharge screw conveyor A is connected to the reactor A via pipeline. An outlet gate valve A and an outlet ball valve A are installed at the outlet of the discharge screw conveyor A.

[0006] Furthermore, the conveying unit B includes a discharge hopper B, a feeding screw conveyor B, an iron removal and slag discharge mechanism B, a main pipeline three-way reversing valve B, a bypass three-way reversing valve B, a dust collector B, a metering bin B, a rotary feeder B, and a discharge screw conveyor B. The discharge hopper B is connected to the feeding screw conveyor B. The feeding screw conveyor B is connected to the iron removal and slag discharge mechanism B via a pipeline. The iron removal and slag discharge mechanism B is connected to the main pipeline three-way reversing valve B via a pipeline. The main pipeline three-way reversing valve B is connected to the bypass three-way reversing valve A and the bypass three-way reversing valve B via pipelines. The bypass three-way reversing valve B is connected to the dust collector B and the metering bin B via pipelines. The dust collector B is connected to the metering bin B. The metering bin B is connected to the rotary feeder B. The rotary feeder B is connected to the discharge screw conveyor B. The discharge screw conveyor B is connected to the reactor B via a pipeline. The outlet of the discharge screw conveyor B is equipped with an outlet gate valve B and an outlet ball valve B.

[0007] Furthermore, the negative pressure unit includes a negative pressure Roots blower A and a negative pressure Roots blower B. Negative pressure Roots blower A is connected to dust collector A and dust collector B via pipelines, and negative pressure Roots blower B is connected to dust collector A and dust collector B via pipelines. Negative pressure sensors are installed on the aforementioned pipelines. A blower inlet butterfly valve A is installed on the inlet pipeline of negative pressure Roots blower A, and a blower inlet butterfly valve B is installed on the inlet pipeline of negative pressure Roots blower B.

[0008] Furthermore, a bypass valve A is provided between the dust collector A and the metering chamber A. The metering chamber A is connected to the bypass valve A via a pipeline, and the bypass valve A is connected to the dust collector A via a pipeline. Similarly, a bypass valve B is provided between the dust collector B and the metering chamber B. The metering chamber A is connected to the bypass valve B via a pipeline, and the bypass valve B is connected to the dust collector B via a pipeline.

[0009] Dust collector A is equipped with a differential pressure gauge A; a material level switch A and a backflush valve assembly A are also installed on dust collector A; an A-bin vent valve A is installed at the inlet of dust collector A; a manual slide gate valve A, a rotary discharge valve A, and a temporary storage bin discharge valve A are installed between dust collector A and metering bin A. Dust collector B is equipped with a differential pressure gauge B; a material level switch B and a backflush valve assembly B are also installed on dust collector B; an B-bin vent valve A is installed at the inlet of dust collector B; a manual slide gate valve B, a rotary discharge valve B, and a temporary storage bin discharge valve B are installed between dust collector B and metering bin B.

[0010] Furthermore, an inlet filter A is installed between the feeding screw conveyor A and the iron removal and slag discharge mechanism A. The feeding screw conveyor A is connected to the inlet filter A via a pipeline, and the inlet filter A is connected to the iron removal and slag discharge mechanism A via a pipeline. Similarly, an inlet filter B is installed between the feeding screw conveyor B and the iron removal and slag discharge mechanism B. The feeding screw conveyor B is connected to the inlet filter B via a pipeline, and the inlet filters AB are connected to the iron removal and slag discharge mechanism B via pipelines. An inlet manual regulating valve A and an inlet check valve A are installed on the pipeline of inlet filter A. An inlet manual regulating valve B and an inlet check valve B are installed on the pipeline of inlet filter B.

[0011] Furthermore, the iron removal and slag discharge mechanism A has the same structure as the iron removal and slag discharge mechanism B.

[0012] Furthermore, the iron removal and slag discharge mechanism B includes an inlet pipe, an inner collecting pipe, an outer collecting pipe, an outlet pipe, and an electromagnet. One end of the outer collecting pipe is connected to the inlet pipe, and the other end is connected to the outlet pipe. The inner collecting pipe is located inside the outer collecting pipe, and its bottom is connected to the inlet pipe. The inner diameter of the top of the inner collecting pipe is smaller than its inner diameter at the bottom. A heavy object collection trough is formed between the inner collecting pipe and the outer collecting pipe. The electromagnet is located above the heavy object collection trough. The inlet pipe is connected to the feeding screw conveyor B via a pipeline, and the outlet pipe is connected to the main pipeline three-way reversing valve B via a pipeline.

[0013] The inner collecting pipe adopts a variable diameter design, with the pipe diameter shrinking from DN300 to DN200, where the material is accelerated. After entering the outlet pipe, the pipe diameter expands back to DN300. The high-density material in the gas-solid mixture is transported upward along the lower DN200 pipe by the high-speed airflow, laying the flow field foundation for subsequent separation operations.

[0014] Furthermore, the heavy material collection trough is equipped with a slag discharge gate valve and a high-level switch; the outlet pipe is equipped with an outlet gate valve. The direct conveying section is prone to blockage when the pneumatic conveying system unexpectedly stops. Based on field testing experience, the accumulated material in the vertical section can be completely cleared by opening the slag discharge gate valve and introducing airflow through it, significantly reducing the difficulty of pipe cleaning. Simultaneously, the outlet gate valve can be closed when the equipment stops, providing safe isolation for subsequent pipeline and core component maintenance. The automated slag discharge logic of the high-level switch and the inclined design of the heavy material collection trough: The heavy material collection trough is designed with an inclined direction to provide gravity assistance for automatic slag discharge; a high-level switch is installed on the side of the heavy material collection trough, which forms an interlock control with the slag discharge gate valve. When the high-level switch detects that the material level in the trough is too high, it immediately triggers an audible and visual alarm; after the pneumatic conveying system has completely stopped, the slag discharge gate valve automatically opens, and with the help of the inclined structure of the slag collection hopper, the waste slag is smoothly discharged along the inclined direction, avoiding accumulation and blockage.

[0015] Furthermore, the inner side of the collecting inner tube is provided with several guide plates; the angle between the sidewall of the collecting inner tube and the horizontal plane is greater than or equal to 30 degrees. Lightweight materials, due to their low suspension velocity, can be continuously carried by the 10-12 m / s airflow from the outlet pipe and transported along the upper DN300 pipe. To avoid turbulence during the diameter change process, guide plates with a height of 20 mm are installed on the inner wall of the collecting inner tube. This structured guidance maintains the airflow in a laminar state, reducing energy loss and the risk of material adhering to the wall.

[0016] Furthermore, when the gas flow rate is 11-12 m / s, the magnetic field strength of the electromagnet is 10000-14000 Gauss; the electromagnet operates intermittently, specifically: running for 10 seconds and stopping for 5 seconds. The electromagnet and the heavy object collection tank work together to separate the materials: To ensure the effectiveness of iron removal and separation of heavy materials, an intermittently energized electromagnet is installed at the upper part of the inner collection tube to adsorb iron blocks in the airflow; after entering the outlet pipe, the increased pipe diameter causes a sudden drop in airflow velocity. Due to the combined effects of inertia, magnetism, and gravity, heavy materials cannot continue to rise with the decelerated airflow and ultimately fall along the inner wall of the outlet pipe into the heavy object collection tank, achieving initial separation of light and heavy materials.

[0017] The iron removal and slag discharge mechanism utilizes a triple action of "diameter-changing acceleration + electromagnet adsorption + gravity settling" to achieve efficient separation of heavy materials (including iron blocks) from lightweight materials, reducing wear and blockage in subsequent conveying pipelines. The guide plate precisely guides the airflow to maintain laminar flow, avoiding uneven material distribution caused by turbulence and ensuring a stable conveying speed within the designed range of 10-12 m / s. The outlet gate valve combines anti-blockage cleaning and maintenance isolation functions, while the high-level switch automates waste discharge, reducing manual maintenance intensity. High-level alarms and system shutdown interlocks, along with emergency cleaning at the maintenance port, provide dual protection for equipment operation and maintenance safety, reducing the risk of production interruption. The inclined design of the heavy material collection trough, combined with the automatically controlled outlet gate valve, utilizes gravity to assist in the rapid discharge of waste, avoiding the tedious manual cleaning and reducing waste residue and blockage risks within the hopper.

[0018] Compared with the prior art, the present invention has the following advantages: The raw material conveying system for the recycled polyester field described in this invention is equipped with a negative pressure unit, which can realize real-time monitoring and adjustment of the pressure of the negative pressure airflow, avoiding problems such as pipeline blockage or empty pipes, and ensuring normal production operation. By setting up conveying unit A and conveying unit B, in the event of material blockage, an alarm can be automatically triggered and emergency automatic shutdown and restart, switching to backup pipelines and other handling measures can be taken, reducing manual intervention and improving safety. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of a raw material conveying system for the recycled polyester field according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the iron removal and slag discharge mechanism B according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Feeding hopper A; 2. Feeding hopper B; 3. Feeding screw conveyor A; 4. Feeding screw conveyor B; 5. Inlet filter A; 6. Inlet filter B; 7. Inlet manual regulating valve A; 8. Inlet manual regulating valve B; 9. Inlet check valve A; 10. Inlet check valve B; 11. Main pipeline three-way directional valve A; 12. Main pipeline three-way directional valve B; 13. Bypass three-way directional valve A; 14. Bypass three-way directional valve B; 15. Temporary storage bin discharge valve A; 16. Temporary storage bin discharge valve B; 17. Rotary discharge valve A; 18. Rotary discharge valve B; 19. Manual slide gate valve A; 20. Manual slide gate valve B; 21. Dust collector A; 22. Dust collector B; 23. Bypass valve A; 24. Bypass valve B; 25. Level switch A; 26. Level switch B; 27. Backflush valve assembly A; 28. Backflush valve assembly B; 29. ​​Differential pressure gauge A; 30. Differential pressure gauge B; 31. A-compartment vent valve A; 32. B-compartment vent valve B; 33. Metering compartment A; 34. Metering compartment B; 35. Rotary feeder A; 36. Rotary feeder B; 37. Discharge screw conveyor A; 38. Discharge screw conveyor B; 39. Outlet gate valve A; 40. Outlet gate valve B; 41. Outlet ball valve A; 42. Outlet ball valve B; 43. Negative pressure sensor; 44. Fan inlet butterfly valve A; 45. 46. ​​Blower inlet butterfly valve B; 47. Negative pressure Roots blower A; 48. Negative pressure Roots blower B; 49. Iron removal and slag discharge mechanism A; 40. Iron removal and slag discharge mechanism B; 41. Inlet pipe; 492. Inner collection pipe; 493. Outer collection pipe; 494. Heavy object collection trough; 495. Electromagnet; 496. Guide plate; 497. Outlet pipe; 498. Slag discharge slide valve; 499. Outlet slide valve; 4910. High level switch. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figure 1-2As shown, a raw material conveying system for the recycled polyester industry includes a conveying unit A, a conveying unit B, and a negative pressure unit. The negative pressure unit is connected to both conveying units A and B via pipelines. Conveying unit A includes a discharge hopper A, a feeding screw conveyor A, an iron removal and slag discharge mechanism A, a main pipeline three-way reversing valve A, a bypass three-way reversing valve A, a dust collector A, a metering bin A, a rotary feeder A, and a discharge screw conveyor A. The discharge hopper A is connected to the feeding screw conveyor A, and the feeding screw conveyor A is connected to the iron removal and slag discharge mechanism A via pipelines. The iron removal and slag discharge mechanism A is connected to the main pipeline three-way reversing valve A via pipelines. The main pipeline three-way reversing valve A is connected to the bypass three-way reversing valve A and the conveying unit B via pipelines. The bypass three-way reversing valve A is connected to the dust collector A and the metering chamber A via pipelines. The dust collector A is connected to the metering chamber A. The metering chamber A is connected to the rotary feeder A. The rotary feeder A is connected to the discharge screw conveyor A. The discharge screw conveyor A is connected to the reactor A via pipelines. An outlet gate valve A and an outlet ball valve A are installed at the outlet of the discharge screw conveyor A.

[0029] The conveying unit B includes a hopper B, a feeding screw conveyor B, an iron removal and slag discharge mechanism B, a main pipeline three-way reversing valve B, a bypass three-way reversing valve B, a dust collector B, a metering bin B, a rotary feeder B, and a discharge screw conveyor B. The hopper B is connected to the feeding screw conveyor B. The feeding screw conveyor B is connected to the iron removal and slag discharge mechanism B via a pipeline. The iron removal and slag discharge mechanism B is connected to the main pipeline three-way reversing valve B via a pipeline. The main pipeline three-way reversing valve B is connected to the bypass three-way reversing valve A and the bypass three-way reversing valve B via pipelines. The bypass three-way reversing valve B is connected to the dust collector B and the metering bin B via pipelines. The dust collector B is connected to the metering bin B. The metering bin B is connected to the rotary feeder B. The rotary feeder B is connected to the discharge screw conveyor B. The discharge screw conveyor B is connected to the reactor B via a pipeline. The outlet of the discharge screw conveyor B is equipped with an outlet gate valve B and an outlet ball valve B.

[0030] The negative pressure unit includes a negative pressure Roots blower A and a negative pressure Roots blower B. Negative pressure Roots blower A is connected to dust collector A and dust collector B via pipelines, and negative pressure Roots blower B is connected to dust collector A and dust collector B via pipelines. Negative pressure sensors are installed on the pipelines. A blower inlet butterfly valve A is installed on the inlet pipeline of negative pressure Roots blower A, and a blower inlet butterfly valve B is installed on the inlet pipeline of negative pressure Roots blower B.

[0031] A bypass valve A is provided between the dust collector A and the metering chamber A. The metering chamber A is connected to the bypass valve A through a pipeline, and the bypass valve A is connected to the dust collector A through a pipeline. A bypass valve B is provided between the dust collector B and the metering chamber B. The metering chamber A is connected to the bypass valve B through a pipeline, and the bypass valve B is connected to the dust collector B through a pipeline.

[0032] Dust collector A is equipped with a differential pressure gauge A; a material level switch A and a backflush valve assembly A are also installed on dust collector A; an A-bin vent valve A is installed at the inlet of dust collector A; a manual slide gate valve A, a rotary discharge valve A, and a temporary storage bin discharge valve A are installed between dust collector A and metering bin A. Dust collector B is equipped with a differential pressure gauge B; a material level switch B and a backflush valve assembly B are also installed on dust collector B; an B-bin vent valve A is installed at the inlet of dust collector B; a manual slide gate valve B, a rotary discharge valve B, and a temporary storage bin discharge valve B are installed between dust collector B and metering bin B.

[0033] An inlet filter A is installed between the feeding screw conveyor A and the iron removal and slag discharge mechanism A. The feeding screw conveyor A is connected to the inlet filter A via a pipeline, and the inlet filter A is connected to the iron removal and slag discharge mechanism A via a pipeline. An inlet filter B is installed between the feeding screw conveyor B and the iron removal and slag discharge mechanism B. The feeding screw conveyor B is connected to the inlet filter B via a pipeline, and the inlet filters AB are connected to the iron removal and slag discharge mechanism B via pipelines. An inlet manual regulating valve A and an inlet check valve A are installed on the pipeline of inlet filter A. An inlet manual regulating valve B and an inlet check valve B are installed on the pipeline of inlet filter B.

[0034] The iron removal and slag discharge mechanism A and the iron removal and slag discharge mechanism B have the same structure. The iron removal and slag discharge mechanism B includes an inlet pipe, an inner collecting pipe, an outer collecting pipe, an outlet pipe, and an electromagnet. One end of the outer collecting pipe is connected to the inlet pipe, and the other end is connected to the outlet pipe. The inner collecting pipe is located inside the outer collecting pipe, and its bottom is connected to the inlet pipe. The inner diameter of the top of the inner collecting pipe is smaller than its inner diameter at the bottom. A heavy object collection trough is formed between the inner collecting pipe and the outer collecting pipe. The electromagnet is located above the heavy object collection trough. The inlet pipe is connected to the feeding screw conveyor B through a pipeline, and the outlet pipe is connected to the main pipeline three-way reversing valve B through a pipeline.

[0035] The inner collecting pipe adopts a variable diameter design, with the pipe diameter shrinking from DN300 to DN200, where the material is accelerated. After entering the outlet pipe, the pipe diameter expands back to DN300. The high-density material in the gas-solid mixture is transported upward along the lower DN200 pipe by the high-speed airflow, laying the flow field foundation for subsequent separation operations.

[0036] The heavy material collection trough is equipped with a slag discharge gate valve and a high-level switch; the outlet pipe is equipped with an outlet gate valve. The direct conveying section is prone to blockage when the pneumatic conveying system unexpectedly stops. Based on field experience, the accumulated material in the vertical section can be completely cleared by opening the slag discharge gate valve and introducing airflow through it, significantly reducing the difficulty of pipe cleaning. Simultaneously, the outlet gate valve can be closed when the equipment stops, providing safe isolation for subsequent pipeline and core component maintenance. The automated slag discharge logic of the high-level switch and the inclined design of the heavy material collection trough: The inclined design of the heavy material collection trough provides gravity assistance for automatic slag discharge; a high-level switch is installed on the side of the heavy material collection trough, which is interlocked with the slag discharge gate valve. When the high-level switch detects that the material level in the trough is too high, it immediately triggers an audible and visual alarm; after the pneumatic conveying system has completely stopped, the slag discharge gate valve automatically opens, and the inclined structure of the slag collection hopper allows the waste slag to be smoothly discharged along the inclined direction, avoiding accumulation and blockage.

[0037] Four guide vanes are installed on the inner side of the collecting inner tube; the angle between the sidewall of the collecting inner tube and the horizontal plane is greater than or equal to 30 degrees. Lightweight materials, due to their low suspension velocity, can be continuously carried by the 10-12 m / s airflow from the outlet pipe and transported along the upper DN300 pipe. To avoid turbulence during the diameter change process, guide vanes with a height of 20 mm are installed on the inner wall of the collecting inner tube. This structured guidance maintains laminar flow, reducing energy loss and the risk of material adhering to the wall. When the gas velocity is 11-12 m / s, the magnetic field strength of the electromagnet is 10000-14000 Gauss; the electromagnet operates intermittently, specifically: running for 10 seconds and stopping for 5 seconds.

[0038] Implementation process: Material bin A needs replenishment, which can be achieved through two hoppers. The following instructions begin with hopper A: Start feeding into bin A. Open the blower inlet butterfly valve A44, close the blower inlet butterfly valve B45, open the A bin vent valve A31, close the B bin vent valve B32, check if the rotary discharge valve A17 is functioning correctly. If it is, close the bypass valve A23, open the rotary discharge valve A17 to ensure it is airtight, open the lower channel of the main pipeline three-way directional valve A11 (the lower channel of the main pipeline three-way directional valve A11 is fault-open, and the upper channel of the main pipeline three-way directional valve B12 is fault-open), open the upper channel of the bypass three-way directional valve A13 (the upper channel of the bypass three-way directional valve A13 is fault-open), open the temporary storage bin discharge valve A15, and wait until all valves are in operation. After all operations are completed, start the rotary motor of rotary discharge valve A17 and open the backflush valve group A27 of the dust collector. If rotary discharge valve A17 is detected as abnormal, open bypass valve A23, open the lower channel of main pipeline three-way reversing valve A11, open the lower channel of bypass three-way reversing valve A13, and close temporary storage bin discharge valve A15. Through the bypass of the dust collector, directly draw the metering bin A33 into negative pressure and feed material using the bypass pipeline. After the above valves are completed, delay for 2 seconds and check whether the material level switch A25 of dust collector A alarms. If an alarm is triggered, stop the program and output an alarm prompt for manual handling. If normal, start the negative pressure Roots blower A46 to build a negative pressure pipeline. After a 30-second delay, start the feeding screw conveyor A to complete the entire conveying process. During operation, the following values ​​are continuously monitored for abnormalities: 1. Continuously check whether the negative pressure sensor is less than -45Kpa. If it is less than this set value, it is determined that the pipeline is slightly blocked. The feeding screw conveyor A is shut down to prevent the blockage from worsening. If the negative pressure value is less than -50Kpa, the negative pressure Roots blower A / B is shut down directly, and an alarm signal for pipeline blockage is output. 2. Continuously check if the current of the rotary feeder valve A is abnormal. If it is abnormal, stop the rotary feeder valve A17 and wait for it to stop completely. Then, reverse the operation for 2 seconds and proceed to the next step. Check if the material level switch of the dust collector A alarms. If it alarms, open the bypass valve A23, open the lower channel of the main pipeline three-way reversing valve A11, open the lower channel of the bypass three-way reversing valve A13, and close the temporary storage bin feeder valve A15. Through the bypass of the dust collector, directly draw the metering bin A into negative pressure and feed material using the bypass pipeline. If it is normal, return to check if the current of the rotary feeder valve A is abnormal. 3. When operating the negative pressure Roots blower A, continuously check whether the current of the negative pressure Roots blower A is abnormal. If it is abnormal, open the blower inlet butterfly valve B, close the blower inlet butterfly valve A, and start the negative pressure Roots blower B. Maintain the negative pressure through the standby blower. If the blockage in the downstream pipeline corresponding to hopper A cannot be cleared by restarting the negative pressure Roots blower, then hopper B can be used to replenish the metering chamber A.

[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A raw material conveying system for the field of recycled polyester, characterized in that: The system includes a conveying unit A, a conveying unit B, and a negative pressure unit. The negative pressure unit is connected to both conveying units A and B via pipelines. Conveying unit A includes a discharge hopper A, a feeding screw conveyor A, an iron removal and slag discharge mechanism A, a main pipeline three-way reversing valve A, a bypass three-way reversing valve A, a dust collector A, a metering bin A, a rotary feeder A, and a discharge screw conveyor A. The discharge hopper A is connected to the feeding screw conveyor A, and the feeding screw conveyor A is connected to the iron removal and slag discharge mechanism A via pipelines. The slag removal mechanism A is connected to the main pipeline three-way reversing valve A via a pipeline. The main pipeline three-way reversing valve A is connected to the bypass three-way reversing valve A and the conveying unit B via pipelines. The bypass three-way reversing valve A is connected to the dust collector A and the metering chamber A via pipelines. The dust collector A is connected to the metering chamber A. The metering chamber A is connected to the rotary feeder A. The rotary feeder A is connected to the discharge screw conveyor A. The discharge screw conveyor A is connected to the reactor A via a pipeline.

2. The raw material conveying system for the recycled polyester field according to claim 1, characterized in that: The conveying unit B includes a hopper B, a feeding screw conveyor B, an iron removal and slag discharge mechanism B, a main pipeline three-way reversing valve B, a bypass three-way reversing valve B, a dust collector B, a metering bin B, a rotary feeder B, and a discharge screw conveyor B. The hopper B is connected to the feeding screw conveyor B. The feeding screw conveyor B is connected to the iron removal and slag discharge mechanism B via a pipeline. The iron removal and slag discharge mechanism B is connected to the main pipeline three-way reversing valve B via a pipeline. The main pipeline three-way reversing valve B is connected to the bypass three-way reversing valve A and the bypass three-way reversing valve B via pipelines. The bypass three-way reversing valve B is connected to the dust collector B and the metering bin B via pipelines. The dust collector B is connected to the metering bin B. The metering bin B is connected to the rotary feeder B. The rotary feeder B is connected to the discharge screw conveyor B. The discharge screw conveyor B is connected to the reactor B via a pipeline.

3. The raw material conveying system for the recycled polyester field according to claim 2, characterized in that: The negative pressure unit includes a negative pressure Roots blower A and a negative pressure Roots blower B. The negative pressure Roots blower A is connected to the dust collector A and the dust collector B respectively through pipelines, and the negative pressure Roots blower B is connected to the dust collector A and the dust collector B respectively through pipelines.

4. The raw material conveying system for the recycled polyester field according to claim 3, characterized in that: A bypass valve A is provided between the dust collector A and the metering chamber A. The metering chamber A is connected to the bypass valve A through a pipeline, and the bypass valve A is connected to the dust collector A through a pipeline. A bypass valve B is provided between the dust collector B and the metering chamber B. The metering chamber A is connected to the bypass valve B through a pipeline, and the bypass valve B is connected to the dust collector B through a pipeline.

5. The raw material conveying system for the recycled polyester field according to claim 2 or 3, characterized in that: An inlet filter A is installed between the feeding screw conveyor A and the iron removal and slag discharge mechanism A. The feeding screw conveyor A is connected to the inlet filter A through a pipeline, and the inlet filter A is connected to the iron removal and slag discharge mechanism A through a pipeline. An inlet filter B is installed between the feeding screw conveyor B and the iron removal and slag discharge mechanism B. The feeding screw conveyor B is connected to the inlet filter B through a pipeline, and the inlet filter AB is connected to the iron removal and slag discharge mechanism B through a pipeline.

6. The raw material conveying system for the recycled polyester field according to claim 2 or 3, characterized in that: The iron removal and slag discharge mechanism A has the same structure as the iron removal and slag discharge mechanism B.

7. The raw material conveying system for the recycled polyester field according to claim 6, characterized in that: The iron removal and slag discharge mechanism B includes an inlet pipe, an inner collecting pipe, an outer collecting pipe, an outlet pipe, and an electromagnet. One end of the outer collecting pipe is connected to the inlet pipe, and the other end is connected to the outlet pipe. The inner collecting pipe is located inside the outer collecting pipe, and its bottom is connected to the inlet pipe. The inner diameter of the top of the inner collecting pipe is smaller than its inner diameter at the bottom. A heavy object collection trough is formed between the inner collecting pipe and the outer collecting pipe. The electromagnet is located above the heavy object collection trough. The inlet pipe is connected to the feeding screw conveyor B via a pipeline, and the outlet pipe is connected to the main pipeline three-way reversing valve B via a pipeline.

8. The raw material conveying system for the recycled polyester field according to claim 7, characterized in that: The heavy material collection tank is equipped with a slag discharge gate valve and a high material level switch; the outlet pipe is equipped with an outlet gate valve.

9. The raw material conveying system for the recycled polyester field according to claim 7, characterized in that: The inner side of the collecting inner tube is provided with several guide plates; the angle between the side wall of the collecting inner tube and the horizontal plane is greater than or equal to 30 degrees.

10. The raw material conveying system for the recycled polyester field according to claim 7, characterized in that: When the gas flow rate is 11-12 m / s, the magnetic field strength of the electromagnet is 10000-14000 Gauss; the electromagnet operates intermittently, specifically: it runs for 10 seconds and stops for 5 seconds.

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