Bisphenol a material collection, conveying, and screening system and method

Abstract

A system and method for collecting, conveying, and screening bisphenol A (BPA) materials are disclosed. The system includes a collection system, a conveying system, and a screening system. The collection system includes a collection drive assembly, scraper arms, scraper plates, and a distance detection assembly. The collection drive assembly is installed at the bottom of a BPA granulation tower. Scraper arms are installed on both sides of the collection drive assembly, and scraper plates are distributed on the scraper arms. Distance detection assemblies are installed at the front and rear ends of each scraper arm to measure the distance between the scraper arm and the bottom of the granulation tower. The collection drive assembly drives the scraper arms to rotate, and the scraper plates installed below the scraper arms promptly clean and collect the BPA particles at the bottom of the granulation tower. The screening system is connected to the end of the conveying system via a flexible connection. The conveying system transports the material swept into the conveying system from the collection system to the screening system. The screening system separates unqualified BPA materials by using a rotary reciprocating motion at the feed end and a linear motion at the discharge end.

Description

Technical Field

[0001] This invention relates to the field of bisphenol A production, and more specifically to a system and method for collecting, conveying and screening bisphenol A materials. Background Technology

[0002] In the chemical industry, finished materials are typically transported directly to finished product silos via pneumatic conveyors, belt conveyors, or screw conveyors. If the material has good flowability, it can also be transported directly to the finished product silo by weight through pipelines, from where it enters the packaging system for packaging and sealing. If there are quality control requirements for the particle size of the material, a secondary screening is required to improve the product qualification rate.

[0003] The collection of materials in this process is generally difficult to be clean and thorough, the conveying process is not stable and continuous, and the screening system is prone to clogging during secondary screening. For flat-bottom tower bisphenol A granulation systems, the bisphenol A particles granulated in the granulation tower need to be collected from the granulation tower in a timely manner and conveyed to the next stage. Bisphenol A particles have unique characteristics: during material collection and conveying, friction between particles generates a lot of powder and may even break, thereby reducing the quality of the bisphenol A material. How to efficiently collect, stably convey, and reasonably screen the bisphenol A particles generated in the granulation tower to ensure the quality of the bisphenol A material and avoid material loss in this process is a challenge. Existing equipment and published patents have not considered or only partially considered the above problems, and the actual application results are not ideal. Therefore, there is an urgent need to develop an efficient, reliable, and stable system and method suitable for the collection, conveying, and screening of bisphenol A materials to solve the shortcomings of existing technologies. Summary of the Invention

[0004] The technical problem solved by this invention is to propose a collection, conveying and screening system and method for bisphenol A materials, which can sequentially complete the collection, short-distance conveying and filtering of oversized and fragile materials as needed.

[0005] The solution of the present invention is: a bisphenol A material collection, conveying and screening system, including a collection system, a conveying system and a screening system;

[0006] The collection system is used to promptly clean and collect bisphenol A particles at the bottom of the granulation tower.

[0007] The screening system and the conveying system are connected at the end by a flexible connection. The conveying system transports the material swept into the conveying system from the collection system to the screening system. The screening system separates unqualified bisphenol A material by using a rotary reciprocating motion at the feeding end and a linear motion at the discharging end.

[0008] Preferably, the collection system includes a collection drive assembly, scraper arms, scraper plates, and a distance detection assembly. The collection drive assembly is installed at the bottom of the bisphenol A granulation tower. Scraper arms are installed on both sides of the collection drive assembly, and scraper plates are distributed on the scraper arms. Distance detection assemblies are respectively set at the front and rear ends of each scraper arm to measure the distance between the scraper arm and the bottom of the granulation tower. The collection drive assembly drives the scraper arms to rotate, and the scraper plates installed below the scraper arms promptly clean and collect the bisphenol A particles at the bottom of the granulation tower.

[0009] Preferably, multiple scraper blades are installed below each scraper arm, with the inner scraper blade tilted in the opposite direction to the outer scraper blade. Viewed from the bottom, the outer scraper blade is tilted 60° to the left, and the inner scraper blade is tilted 60° to the right.

[0010] Preferably, the number of inner scrapers with an inclination direction opposite to that of the outer scraper ensures that material does not accumulate near the collection drive assembly.

[0011] Preferably, distance detection components are installed on both the inner and outer sides of each scraper arm to measure the distance from the scraper arm to the bottom of the granulation tower. The control system automatically adjusts the height of each scraper plate in real time based on the distance data measured at the two positions, so that the distance between each scraper plate and the bottom of the tower does not exceed 5mm.

[0012] Because the scraper blade is in constant contact with and rubs against the material, it is treated with a special wear-resistant process to greatly improve its wear resistance. Additionally, to accommodate installation errors, the scraper blade is equipped with a height adjustment mechanism to ensure the correct distance between the scraper blade and the bottom of the hopper.

[0013] Preferably, the conveying system includes a screw drive motor, a conveying system housing, a screw shaft, and screw blades; the conveying system housing is used to connect to the bottom of the bisphenol A granulation tower, the screw shaft is installed inside the conveying system housing, the screw shaft rotates under the drive of the screw drive motor, and the screw shaft is provided with screw blades, the diameter of the screw blades gradually increases in the material forward direction, and the bisphenol A particles collected by the collection system are conveyed to the screening system through the screw blades.

[0014] The ratio of the diameter of the helical blade to the pitch is set to 1.8° to 2.2°, preferably 2°.

[0015] The tilt angle of the helical blade is 1.8° to 2.2°, preferably 2°.

[0016] Preferably, the screening system includes a vibrating motor, a guide rod, a vibrating screen, a mounting base, a feed inlet, a qualified product outlet, and a non-qualified product outlet;

[0017] A vibratory motor is mounted on one end of the upper surface of the mounting base, and a guide rod is set on the other end. The vibratory screen is set at an angle, with the upper end connected to the vibratory motor and the lower end cooperating with the guide rod. The upper surface of the vibratory screen has a feed inlet at the upper end, which is connected to the end of the conveying system by a flexible connection. The lower surface of the vibratory screen has a qualified product discharge outlet with a constriction, and the lower end of the vibratory screen has a non-qualified product discharge outlet, which is used to collect unqualified bisphenol A particles that have not passed through the vibratory screen.

[0018] Preferably, the vibrating screen is multi-layered, with one layer used to screen out unqualified bisphenol A particles; the remaining layers have different screen openings according to the set bisphenol A particle grade, and each screen layer is equipped with one outlet.

[0019] A method for screening bisphenol A material using a collection, conveying, and screening system includes:

[0020] The scraper arm is rotated by a variable frequency motor driven by the collection drive assembly, with the rotation speed controlled between 2.5 and 3.5 rpm;

[0021] The screw drive motor is controlled to rotate the screw shaft at a speed of 45-55 revolutions per minute;

[0022] The vibrating motor is controlled to vibrate at a frequency of 950 to 1050 rpm, thereby achieving the screening of bisphenol A materials.

[0023] The beneficial effects of this invention compared to the prior art are:

[0024] The bisphenol A material collection, conveying, and screening system and method of the present invention avoids the generation of a large amount of dust and breakage of bisphenol A material during collection, conveying, and screening, thereby improving the quality of bisphenol A and saving materials.

[0025] Firstly, distance detection components at the front and rear ends of the scraper arms in the collection system measure the distance between the scraper arms and the bottom of the granulation tower. Based on the distance data measured at these two locations, the control system automatically adjusts the height of each scraper blade in real-time, ensuring that the distance between each scraper blade and the bottom of the tower does not exceed 5mm. This guarantees that bisphenol A particles at the bottom of the tower are promptly collected and do not remain there for extended periods. Secondly, the inclined angle design of the spiral blades in the conveying system increases the inlet feed rate, which is beneficial for improving the filling rate and conveying efficiency. Finally, the screening system employs a reciprocating motion at the inlet and a linear motion at the outlet. This design effectively disperses the material quickly across the entire screening surface and improves screening efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the bisphenol A material collection, conveying and screening system provided in a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the collection system structure provided in a specific embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the conveying system structure provided in a specific embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the screening system structure provided in a specific embodiment of the present invention;

[0030] The attached diagram is labeled as follows:

[0031] 1. Collection system;

[0032] 11. Drive motor; 12. Collection drive assembly; 13. Scraper arm; 14. Scraper blade; 15. Distance detection assembly

[0033] 2. Conveying system;

[0034] 21. Screw drive motor; 22. Conveying system housing; 23. Screw shaft; 24. Screw blades;

[0035] 3. Screening system;

[0036] 31. Vibrating motor; 32. Guide rod; 33. Vibrating screen; 34. Mounting base; 35. Feed inlet; 36. Qualified product outlet; 37. Unqualified product outlet; Detailed Implementation

[0037] The present invention will be further described below with reference to the embodiments.

[0038] The specific embodiments of the bisphenol A material collection, conveying, and screening system of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, the bisphenol A material collection, conveying and screening system includes a collection system 1, a conveying system 2, and a screening system 3.

[0040] like Figure 2As shown, the collection system 1 includes a drive motor 11, a collection drive assembly 12, scraper arms 13, scraper blades 14, and a distance detection assembly 15. The collection drive assembly 12 is installed in the center of the bottom plate of the granulation tower, with its lower half and the drive motor 3 exposed on the outside of the granulation tower bottom. The drive motor 3 serves as the power output source to control the collection drive assembly 12 and drive the other components to rotate. The upper half of the collection drive assembly 12 is located inside the tower bottom, with a scraper arm 13 installed at each end of the assembly. In this example, the scraper arm is 5.5 meters long, and the diameter of the entire collection system is 12 meters. Each scraper arm 13 is equipped with 13 easily removable and replaceable scraper blades 14; from the outside in, the first 11 scraper blades 14 are angled 45° to the left, and the two scraper blades 14 closest to the drive assembly are angled to the right. This ensures that the first 11 scraper blades 14 can continuously collect the material inward, while the last two scraper blades 14 ensure that the material does not accumulate near the collection drive assembly 12. Distance detection components 15 are respectively installed at the front and rear ends of each scraper arm 13 to measure the distance from the scraper arm 13 to the bottom of the granulation tower. Driven by the collection drive component, the collection system rotates the scraper arm, and the scraper plates installed below the scraper arm promptly clean and collect the bisphenol A particles at the bottom of the granulation tower, thus preventing the material from remaining at the bottom for extended periods. The control system automatically adjusts the height of each scraper plate 14 in real time based on the distance data measured at the two locations, ensuring that the distance between each scraper plate 14 and the bottom of the tower does not exceed 5mm, guaranteeing timely cleaning and collection of the bisphenol A particles at the bottom of the tower and preventing long-term retention of bisphenol A material.

[0041] like Figure 3 As shown, the conveying system 2 includes a screw drive motor 21, a conveying system housing 22, a screw shaft 23, and screw blades 24. The conveying system 2 is installed on the bottom of a tower 12.7 meters away from the collection system. The screw shaft 23 inside the conveying system housing 22 rotates under the drive of the screw drive motor 21, transporting the bisphenol A material swept into the conveying system from the collection system 1 to the screening system 3 over a short distance. The diameter-to-pitch ratio of the screw blades 24 on the screw shaft 23 is set to 2. After multiple tests, this parameter shows relatively stable material flow. Simultaneously, at the inlet of the conveying system 2, the screw blades 24 are designed with an inclined angle, meaning the outer diameter of the screw blades 24 gradually increases in the direction of bisphenol A material movement. After multiple tests, this angle was ultimately set to 2°, which is considered the most reasonable. This allows the bisphenol A material to be more easily drawn into the conveying system housing 22 by the screw blades, increasing the inlet feed rate. This avoids material accumulation at the inlet, improves the filling rate of the conveying system, and enhances conveying efficiency.

[0042] The screening system and the conveying system are connected at the end by a flexible connection. The feeding end of the screening system uses a rotary reciprocating motion, while the discharging end uses a linear motion. The rotary reciprocating motion, starting from the drive head, gradually evolves into an elliptical trajectory along the length of the equipment, ultimately becoming an approximately linear trajectory at the discharge port. Figure 4 As shown, the screening system 3 includes a vibrating motor 31, a guide rod 32, a vibrating screen 33, a mounting base 34, a feed inlet 35, a qualified product outlet 36, and a non-qualified product outlet 37. The screening system 3 is mounted on a fixed mounting base 34. The feed inlet 35 is connected to the end of the conveying system 2 via a flexible connection. The vibrating screen 33 is designed with an inclined orientation, with the feed inlet 35 at a higher position and the non-qualified product outlet 37 at a lower position. Driven by the vibrating motor 31 mounted on one side of the feed end, the vibrating screen 33 continuously performs a reciprocating circular motion. Simultaneously, a guide rod 32 is provided on one side of the non-qualified product outlet 37, which restricts the vibrating screen 33 to maintain only a linear forward and backward movement. In this state, after the bisphenol A material enters through the inlet 35, its initial trajectory is circular. As it moves towards the qualified product outlet 36, the trajectory gradually transitions from circular to elliptical motion, and finally becomes linear near the unqualified product outlet 37. This design effectively disperses the bisphenol A material rapidly across the entire screening surface, significantly improving the screening efficiency. If downstream processing requires materials with different particle sizes, multiple screens with different apertures can be installed at certain intervals along the vertical direction of the main screen to achieve multiple screenings and ultimately obtain materials with different particle sizes.

[0043] The screening method implemented by the bisphenol A material collection, conveying and screening system described above includes the following steps:

[0044] (a) Bisphenol A collection: The drive assembly uses two 5.5kW motors (variable frequency motors, one for use and one for standby) to drive the collection drive assembly, which drives the scraper arm to rotate at a speed of 3 revolutions per minute. The material is collected into the conveying system through the scraper plate connected below the scraper arm.

[0045] (b) Bisphenol A conveying: connected to a bisphenol A collection system, driven by a screw drive motor (variable frequency motor).

[0046] With a power of 37kW, a screw shaft speed of 49 rpm, and a screw blade diameter-to-pitch ratio of 2, the material is conveyed from the bottom of the granulation tower to the external space.

[0047] (c) Bisphenol A screening: Connected to the bisphenol A conveying system via a flexible connection, the vibrating motor has a power of 2.2kW and a screening frequency of 3.6HZ. Large particles and foreign objects are screened and discharged from the system through the non-conforming product outlet, while qualified products enter the downstream process through the qualified product outlet.

[0048] The rotation speed and material level parameters of each system are monitored in real time by DCS to ensure that the bisphenol A produced by the granulation tower is collected, conveyed and screened efficiently, while avoiding dust and breakage caused by mutual friction between materials.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A system for collecting, conveying, and screening bisphenol A materials, characterized in that... Includes collection systems, conveying systems, and screening systems; The collection system is used to promptly clean and collect bisphenol A particles at the bottom of the granulation tower. The screening system and the conveying system are connected at the end by a flexible connection. The conveying system transports the material swept into the conveying system from the collection system to the screening system. The screening system separates unqualified bisphenol A material by using a rotary reciprocating motion at the feeding end and a linear motion at the discharging end. The collection system includes a collection drive assembly, a scraper arm, a scraper plate, and a distance detection assembly; The collection drive assembly is installed at the bottom of the bisphenol A granulation tower. Scraper arms are installed on both sides of the collection drive assembly, and multiple scraper blades are installed below each scraper arm. Distance detection components are set at the front and rear ends of each scraper arm to measure the distance between the scraper arm and the bottom of the granulation tower. The collection drive assembly drives the scraper arm to rotate, and the scraper blades installed below the scraper arm clean and collect the bisphenol A particles at the bottom of the granulation tower in a timely manner. The control system automatically adjusts the height of each scraper blade in real time based on the distance data measured at the two positions, so that the distance between each scraper blade and the bottom of the tower does not exceed 5mm.

2. The bisphenol A material collection, conveying, and screening system according to claim 1, characterized in that: The inclination direction of the scraper blade on the inner side of the scraper arm is opposite to that of the outer scraper blade.

3. The bisphenol A material collection, conveying, and screening system according to claim 2, characterized in that: The number of inner scrapers, which are tilted in the opposite direction to the outer scraper, ensures that material does not accumulate near the collection drive assembly.

4. The bisphenol A material collection, conveying, and screening system according to claim 1, characterized in that: The conveying system includes a screw drive motor, a conveying system housing, a screw shaft, and screw blades; The conveying system housing is used to connect to the bottom of the bisphenol A granulation tower. A spiral shaft is installed inside the conveying system housing. The spiral shaft rotates under the drive of a spiral drive motor. Spiral blades are provided on the spiral shaft. The diameter of the spiral blades gradually increases in the direction of material movement. The bisphenol A particles collected by the collection system are conveyed to the screening system through the spiral blades.

5. The bisphenol A material collection, conveying, and screening system according to claim 4, characterized in that: The ratio of the diameter of the helical blade to the pitch is set to 1.8~2.

2.

6. The bisphenol A material collection, conveying, and screening system according to claim 5, characterized in that: The ratio of the diameter of the helical blade to the pitch is set to 2.

7. The bisphenol A material collection, conveying, and screening system according to claim 4, characterized in that: The tilt angle of the helical blades is 1.8°~2.2°.

8. The bisphenol A material collection, conveying, and screening system according to claim 7, characterized in that: The tilt angle of the helical blades is 2°.

9. The bisphenol A material collection, conveying, and screening system according to claim 1, characterized in that: The screening system includes a vibrating motor, guide rods, a vibrating screen, a mounting base, a feed inlet, a qualified product outlet, and a non-qualified product outlet; A vibratory motor is mounted on one end of the upper surface of the mounting base, and a guide rod is set on the other end. The vibratory screen is set at an angle, with the upper end connected to the vibratory motor and the lower end cooperating with the guide rod. The upper surface of the vibratory screen has a feed inlet at the upper end, which is connected to the end of the conveying system by a flexible connection. The lower surface of the vibratory screen has a qualified product discharge outlet with a constriction, and the lower end of the vibratory screen has a non-qualified product discharge outlet, which is used to collect unqualified bisphenol A particles that have not passed through the vibratory screen.

10. The bisphenol A material collection, conveying, and screening system according to claim 9, characterized in that: The vibrating screen is multi-layered, with one layer used to screen out unqualified bisphenol A particles; the remaining layers have different screen openings according to the set bisphenol A particle grade, and each layer of screen is equipped with one outlet.

11. A method for screening materials using the bisphenol A material collection, conveying, and screening system described in claim 4, characterized in that... include: The scraper arm is rotated by a variable frequency motor driven by the collection drive assembly, with the rotation speed controlled at 2.5~3.5 rpm; The screw drive motor is controlled to rotate the screw shaft at a speed of 45~55 revolutions per minute; The vibrating motor is controlled to vibrate at a frequency of 950~1050 rpm, thereby achieving the screening of bisphenol A materials.

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