Polyethylene fiber production solvent decolorization production system, decolorization tank and decolorization process

Abstract

The present application relates to the technical field of polyethylene fiber production, and specifically relates to a polyethylene fiber production solvent decolorization production system, a decolorization tank and a decolorization process, which comprises a decolorization tank, both sides of the top end of the decolorization tank are respectively provided with a sand inlet and a gas permeation pipe, one side of the decolorization tank is also respectively provided with a sight window and a discharge window, the inside of the decolorization tank is provided with decolorization filler, the discharge window and the sight window are respectively located on the upper and lower sides of the decolorization filler, the inside of the sand inlet is also provided with a feeding assembly, the feeding assembly is used for treating the decolorization sand before entering the decolorization tank, the bottom end of the decolorization tank is provided with a cleaning assembly, the cleaning assembly comprises a cleaning box fixedly installed below the decolorization tank and a stirring module located in the inside of the cleaning box, and the stirring module is used for stirring and cleaning the oil stains in the inside of the cleaning assembly. Compared with the prior art, the feeding assembly provided in the present application makes the production process more efficient and stable, reduces the failure and downtime, and finally improves the production efficiency and quality.

Description

Technical Field

[0001] This invention relates to the field of polyethylene fiber production technology, and in particular to a solvent decolorization production system, decolorization tank, and decolorization process for polyethylene fiber production. Background Technology

[0002] In the production of high-molecular-weight, high-strength, and high-modulus polyethylene (UHMWPE) fibers, white oil is used as a solvent. Due to the molecular weight of UHMWPE fibers being around 4 million, their melt viscosity is extremely high, requiring a large amount of white oil to dissolve the UHMWPE, break the entanglement of the polyethylene macromolecules, and prepare a uniform spinning solution. The white oil solvent is recycled, and the main process involves adsorption with bleaching clay and multi-stage filtration. After repeated use, the white oil solvent yellows, and the amount of activated bleaching clay added increases, making subsequent environmental treatment more difficult. To reduce costs, a white oil decolorization vacuum filtration unit is adopted, which is both environmentally friendly and cost-effective.

[0003] In traditional solvent decolorization production systems, decolorization tanks, and decolorization processes for polyethylene fiber production, without a circulating heating dehydration step, the water in the solvent oil cannot evaporate sufficiently and will remain in the solvent oil. This water will affect the subsequent decolorization process, reduce the decolorization effect, and even lead to incomplete decolorization. Furthermore, without a circulating heating degassing step, gases in the solvent oil cannot be effectively removed. These gases may be oxygen or nitrogen from the air, or volatile organic compound vapors generated during the decolorization process. If these gases remain in the solvent oil, they will cause problems such as bubbles and foams in subsequent processing, affecting product quality. Additionally, the way the decolorizing sand enters the decolorization tank is usually not uniform, resulting in uneven distribution of the decolorizing sand within the tank. This leads to inconsistent decolorization effects, and some solvent oil cannot fully contact the decolorizing sand, affecting the decolorization effect. Therefore, this application discloses a solvent decolorization production system, decolorization tank, and decolorization process for polyethylene fiber production to meet the requirements of higher decolorization efficiency, product quality, and a more stable production process. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a solvent decolorization production system, decolorization tank and decolorization process for polyethylene fiber production, so as to solve the problems of ineffective evaporation of moisture and gas in solvent oil and uneven distribution of decolorizing sand.

[0005] To achieve the above objectives, the present invention provides a solvent decolorization production system for polyethylene fiber production, comprising a production system including an oil conveying system, a heating system, a vacuum system, a filtration system, a liquid level system, a condensation system, a decolorization system, a sand blowing system, a sand suction system, an electrical control system, and an auxiliary system. The oil delivery system includes an oil outlet valve, a circulation pump, an oil outlet pump, an oil flow meter, a coarse filter I, and a fine filter II. The heating system includes a heater. The vacuum system includes a vacuum pump I, a vacuum pump II, and a condenser. The filtration system includes a coarse filter and a fine filter. The liquid level system includes an upper liquid level controller and a lower liquid level controller. The condensation system includes a condenser. The decolorization system includes two decolorization tank bodies and a decolorization vacuum valve. The sand blowing system includes a sand blowing outlet valve, an air valve, and a discharge window sealing plate. The sand suction system includes a sand suction control main valve and a vacuum pump II.

[0006] Preferably, the vacuum system further includes a vacuum separation system.

[0007] A solvent decolorizing tank for polyethylene fiber production, utilizing the aforementioned solvent decolorizing production system for polyethylene fiber production, includes a decolorizing tank body. A sand inlet and a vent pipe are respectively provided on both sides of the top of the decolorizing tank body. A viewing window and a discharge window are also provided on one side of the decolorizing tank body. Decolorizing filler is provided inside the decolorizing tank body. The discharge window and viewing window are located on the upper and lower sides of the decolorizing filler, respectively. A feeding assembly is also provided inside the sand inlet. The feeding assembly is used to treat the decolorizing sand before it enters the decolorizing tank body. A cleaning assembly is provided at the bottom of the decolorizing tank body. The cleaning assembly includes a cleaning box fixedly installed below the decolorizing tank body and a stirring module located inside the cleaning box. The stirring module is used to stir and clean the oil stains inside the cleaning assembly.

[0008] Preferably, the feeding assembly includes a positioning plate fixedly installed inside the sand inlet and a discharge hopper disposed below the positioning plate. An inclined feeding hopper is disposed on one side of the top of the positioning plate. A reduction motor is disposed in the middle of the positioning plate. The output end of the reduction motor passes through the positioning plate. A rotating rod is rotatably installed inside the discharge hopper. The rotating rod is fixedly connected to the output end of the reduction motor. A discharge pipe is also disposed at the bottom of the discharge hopper.

[0009] Preferably, the cleaning assembly further includes a rotating column rotatably mounted on the bottom of the decolorizing tank body, and a mounting bracket rotatably mounted on the rotating column. The mounting bracket is arranged in a cross shape, wherein two of the mounting brackets are rotatably mounted with a first rotating shaft, and the other two mounting brackets are rotatably mounted with a second rotating shaft. A rotating motor is also fixedly mounted on one side of the cleaning box. A positioning gear is provided on the outside of the rotating column. The positioning gear is arranged in a double-layer gear structure. A rotating gear is provided at the output end of the rotating motor. One layer of the positioning gear is connected to the rotating gear by a chain.

[0010] Preferably, the feeding assembly is installed at an angle inside the sand inlet, the feeding hopper is also at an angle, a screw rod is fixedly sleeved below the reduction motor, the screw rod is located inside and above the discharge pipe, an overflow port is also opened on one side of the positioning plate, and a first positioning rod and a second positioning rod are fixedly connected to both sides of the output end of the reduction motor, and a scraper plate is provided below the first positioning rod and the second positioning rod are arranged at different heights.

[0011] Preferably, stirring rods are provided on both sides below the first rotating shaft, and stirring blades are fixedly installed below each stirring rod. The two stirring rods are staggered. Driven wheels are fixedly connected to the top ends of the two first rotating shafts. The driven wheels are connected to the other gear belt of the positioning gear. Scrapers are provided at the bottom ends of the two second rotating shafts. The bottom end of one scraper is in contact with the inner bottom surface of the cleaning box, and one side of the other scraper is in contact with the inner wall of the cleaning box. A cleaning outlet is rotatably installed at the bottom end of the cleaning box. A cylinder is fixedly installed on one side of the cleaning box. The telescopic end of the cylinder is rotatably connected to one side of the cleaning outlet. The cleaning outlet is fan-shaped, and a cross-shaped support frame is fixedly installed at the bottom end of the cleaning box.

[0012] Preferably, the included angles between the decolorizing tank body and the two sides of the sand inlet outside the decolorizing tank body are 30° and 45° respectively, and the included angles between the decolorizing tank body and the oil inlet channel at the top of the decolorizing tank body are set to 45° and 15° respectively, and the included angles are all welded and filled.

[0013] Preferably, a lighting lamp is provided on one side of the decolorizing tank body, and a discharge window, a lower liquid level controller and an upper liquid level controller are respectively provided on the other side of the decolorizing tank body. The discharge window is located above the decolorizing filler, and the lower liquid level controller and the upper liquid level controller are located below the decolorizing filler. An oil level controller is also provided on one side of the decolorizing tank body.

[0014] 10. A solvent decolorization process for polyethylene fiber production, using the above-mentioned polyethylene fiber production solvent decolorization production system and decolorization tank, comprising the following steps: S1: Open the sand inlet vacuum valve, turn on vacuum pump 2, open sand inlet valve 1 and sand inlet valve 2, and use the vacuum negative pressure principle to draw the decolorizing sand into the body of decolorizing tank 1 and decolorizing tank 2 respectively. Close sand inlet valve 1 and sand inlet valve 2 according to the mixing ratio requirements. S2: Open the inlet valve of the solvent oil before decolorization, start vacuum pump one, the oil enters the heater after passing through coarse filter one, and then enters the gas-liquid separation tower. Water vapor is drawn out by vacuum pump one and enters the condenser. Water condenses into water and gas is discharged. Stop vacuum pump one, stop the circulation pump, and close the internal circulation valve. S3: Open the decolorizing oil inlet valve, close the internal circulation valve, start the circulation pump, and the treated solvent oil is discharged into the body of the No. 1 decolorizing tank and the body of the No. 2 decolorizing tank. After reaching the oil controller position, the oil inlet will automatically stop. Open the decolorizing vacuum valve and start the second vacuum pump to allow the solvent oil to quickly accumulate at the bottom of the decolorizing tank body after decolorizing from the decolorizing sand. S4: When the oil level reaches the height of the upper liquid level controller, open the oil outlet valve and start the oil outlet pump. The oil passes through the coarse filter and fine filter, flows into the oil outlet flow meter, and then flows out from the oil outlet valve and is collected in the finished solvent oil tank. When the oil level drops to the lower liquid level control, the oil outlet pump stops running. S5: Close the desanding vacuum valve, open the sand blowing air valve, and then open the air valve. The oil in the decolorizing tank body is blown out by the gas and accumulates in the lower part of the decolorizing tank body. S6: After closing the air valve, close the sand blowing air valve, open the discharge window sealing plate on the decolorizing tank body, open the sand suction control main valve, turn on the vacuum pump to suck out the decolorized sand in the decolorizing tank body, finally adjust the suction speed, restore the valve to the closed state after suction, and replace the waste sand collection vehicle.

[0015] The beneficial effects of this invention are: 1. This solvent decolorization production system, decolorization tank, and decolorization process for polyethylene fiber production involves a solvent oil circulation heating dehydration and degassing step within the decolorization system. Upon starting vacuum pump one, under vacuum, the solvent oil, after passing through a coarse filter to remove large particulate impurities, enters the heater through the inlet solenoid valve for heating. The hot oil is then sent to the oil separator within the gas-liquid separation tower, where it forms fine oil columns that fall onto the evaporator. The surface area expands thousands of times, forming a very thin oil film. During this descent, the water vapor in the oil breaks down under the high vacuum, forming a three-dimensional... Through multi-layered boiling and vaporization, water and gas in the oil are rapidly separated. Under the action of the circulation pump, the oil returns directly to the heater inlet through the internal circulation valve. After about 20 minutes of internal circulation, all water and gas in the solvent oil can be removed. The water vapor separated from the separation tower is drawn out by the vacuum pump and enters the condenser. The water vapor condenses into water and accumulates at the bottom of the condenser, and is discharged through the drain valve. The gas is discharged with the exhaust port of the vacuum pump. The treated solvent oil is discharged into the decolorization tank through the decolorization inlet valve and the inlet flow meter. After the solvent oil reaches the oil controller position, the oil supply will automatically stop.

[0016] 2. This solvent decolorization production system, decolorization tank, and decolorization process for polyethylene fiber production, through the installation of a feeding assembly, allows the decolorized sand to enter the discharge hopper from the feed inlet during the decolorization process. A motor drives a rotating rod, which in turn rotates the first and second positioning rods, effectively stirring and evenly distributing the decolorized sand. Simultaneously, the bottom spiral rod is also driven by a motor, its rotation causing the decolorized sand to enter the discharge pipe and be conveyed into the decolorization tank. This process ensures the uniform distribution of the decolorized sand within the tank, allowing it to fully contact the solvent oil. The inclined feeding assembly accelerates the feeding process of the decolorized sand, while the overflow port effectively prevents material accumulation during the feeding process, thus maintaining the stable operation of the system. These advantages make the production process more efficient and stable, reducing downtime and malfunctions, ultimately improving production efficiency and quality.

[0017] 3. This polyethylene fiber production solvent decolorization production system, decolorization tank, and decolorization process, equipped with a cleaning component, allows the operator to start a rotating motor when it is necessary to clean the oil stains at the bottom of the decolorization tank. Through a complex transmission system, the entire mounting frame is rotated, effectively cleaning the oil stains at the bottom of the decolorization tank. The movement of the stirring rod and stirring blades ensures thorough cleaning of the bottom oil stains, while the scraper at the bottom removes the oil stains from the outside of the decolorization tank through the cleaning outlet. The scraper design can simultaneously remove oil stains from the bottom and side walls, ensuring comprehensive and thorough cleaning. The cylinder controls the opening and closing of the cleaning outlet to ensure smooth oil discharge, further improving cleaning efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the process of the present invention; Figure 2 This is a schematic diagram of the decolorization tank structure of the present invention; Figure 3 This is a schematic diagram of the feeding assembly structure of the present invention; Figure 4 This is a perspective view of the feeding assembly of the present invention; Figure 5 This is a top view of the cleaning component of the present invention; Figure 6 This is a bottom view of the cleaning component of the present invention; Figure 7 This is a schematic diagram of the stirring module structure of the present invention; Figure 8 This is a schematic diagram of the connection structure between the side tube and the decolorization tank of the present invention; Figure 9 For the present invention Figure 2 Enlarged structural diagram at point I.

[0020] The diagram is marked as follows: 1. Decolorizing tank; 2. Sand inlet; 3. Vent pipe; 4. Decolorizing filler; 5. Lighting lamp; 6. Sight window; 7. Discharge window; 8. Lower liquid level controller; 9. Upper liquid level controller; 10. Oil level controller; 11. Positioning plate; 12. Discharge hopper; 13. Gear motor; 14. Feed hopper; 15. Discharge pipe; 16. Rotating rod; 17. Screw rod; 18. First positioning rod; 19. Second positioning rod; 20. Overflow port; 21. Cleaning tank; 22. Cleaning outlet; 23. Rotating motor; 24. Rotating column; 25. Positioning gear; 26. Mounting frame; 27. First rotating shaft; 28. Stirring rod; 29. ​​Stirring blade; 30. Second rotating shaft; 31. Scraper; 32. Cylinder; 33. Support frame. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figure 1As shown, the solvent decolorization production system for polyethylene fiber production includes a production system, which comprises an oil conveying system, a heating system, a vacuum system, a filtration system, a liquid level system, a condensation system, a decolorization system, a sand blowing system, a sand suction system, an electrical control system, and an auxiliary system. The oil conveying system includes an oil outlet valve, a circulating pump, an oil outlet pump, an oil flow meter, a coarse filter one, and a fine filter two. The heating system includes a heater. The vacuum system includes a vacuum pump one, a vacuum pump two, and a condenser. The filtration system includes a coarse filter and a fine filter. The liquid level system includes an upper liquid level controller 8 and a lower liquid level controller 9. The condensation system includes a condenser. The decolorization system includes two decolorization tank bodies 1 and a decolorization vacuum valve. The sand blowing system includes a sand blowing outlet valve, an air valve, and a discharge window sealing plate. The sand suction system includes a sand suction control main valve and a vacuum pump two. Compared to existing technologies, the oil delivery system is equipped with an anti-backflow safety device to ensure that the oil will not flow back even in the event of a sudden shutdown. The heating system is equipped with an automatic temperature control device and a heating protection device. These two functions ensure that the oil is always kept within the set temperature range, preventing dry burning. The vacuum system uses a naturally cooled rotary vane vacuum pump, which features fast pumping speed, low noise, and good sealing performance, making it suitable for long-term stable operation. The filtration system is equipped with an overpressure protection device and an automatic filter element contamination detection device, which automatically shuts down and alarms when the system pressure reaches a certain value, protecting the equipment from damage. The level system uses a level controller to automatically regulate and balance the oil, ensuring stable oil levels in each container. The condensation system uses an air cooler to cool water vapor, preventing oil emulsification in the condenser and extending the service life of the vacuum pump oil. The decolorization system is equipped with a level controller and a vacuum suction-type decolorizing sand filling and removal system, ensuring the high efficiency of the decolorization process. The sand blowing system uses compressed air to blow sand from the oil, reducing oil content, saving energy, and improving production efficiency. The sand suction system uses a vacuum pump to remove waste decolorizing sand, quickly and effectively removing it and keeping the system clean. The electrical control system uses Schneider Electric products and has overload protection and fault shutdown protection functions, ensuring the safe and reliable operation of the equipment. All system equipment is manufactured according to standards, ensuring the quality and stable performance of the equipment.

[0024] like Figures 1 to 9As shown, a polyethylene fiber production solvent decolorization tank, using the aforementioned polyethylene fiber production solvent decolorization production system, includes a decolorization tank body 1. A sand inlet 2 and a vent pipe 3 are respectively provided on both sides of the top of the decolorization tank body 1. A viewing window 6 and a discharge window 7 are also provided on one side of the decolorization tank body 1. Decolorization filler 4 is provided inside the decolorization tank body 1. The discharge window 7 and the viewing window 6 are located on the upper and lower sides of the decolorization filler 4, respectively. A feeding component is also provided inside the sand inlet 2. The feeding component is used to treat the decolorized sand before it enters the decolorization tank body 1. A cleaning component is provided at the bottom of the decolorization tank body 1. The cleaning component includes a cleaning box 21 fixedly installed below the decolorization tank body 1 and a stirring module located inside the cleaning box 21. The stirring module is used to stir and clean the oil stains inside the cleaning component. The sand inlet 2 is used to add decolorizing sand to the decolorizing tank body 1, while the vent pipe 3 is used to discharge gas from the tank, maintain pressure balance inside the tank, and prevent excessive gas pressure. The viewing window 6 provides a field of view for observing the decolorizing process. Operators can observe the condition of the decolorizing filler 4 and the decolorizing effect through the viewing window. The discharge window 7 is used to facilitate the removal of the decolorized solvent oil. The decolorizing filler 4 is located inside the decolorizing tank body 1 and is used to adsorb and separate impurities and pigments in the solvent oil, thereby improving the purity and quality of the solvent oil. The feeding component is located inside the sand inlet 2 and is used to process the decolorizing sand, which may include pretreatment steps to ensure the quality and applicability of the decolorizing sand, thereby improving the decolorizing efficiency and effect. The cleaning component is located at the bottom of the decolorizing tank body 1 and includes a cleaning box 21 and a stirring module. When oil stains are generated during the decolorizing process, the stirring module can stir and clean the oil stains in the cleaning box 21 to keep the cleaning component clean, thereby ensuring the decolorizing effect and equipment life.

[0025] like Figures 2 to 4 As shown, the feeding assembly includes a positioning plate 11 fixedly installed inside the sand inlet 2 and a discharge hopper 12 disposed below the positioning plate 11. An inclined feeding hopper 14 is disposed on one side of the top of the positioning plate 11. A reduction motor 13 is disposed in the middle of the positioning plate 11, with the output end of the reduction motor 13 penetrating through the positioning plate 11. A rotating rod 16 is rotatably mounted inside the discharge hopper 12, and the rotating rod 16 is fixedly connected to the output end of the reduction motor 13. A discharge pipe 15 is also disposed at the bottom of the discharge hopper 12. The feeding assembly is... The feed hopper 14 is also inclined and installed inside the sand inlet 2. The screw rod 17 is fixedly sleeved below the geared motor 13. The screw rod 17 is located inside the upper part of the discharge pipe 15. An overflow port 20 is also opened on one side of the positioning plate 11. The output end of the geared motor 13 is fixedly connected to the first positioning rod 18 and the second positioning rod 19 respectively. The first positioning rod 18 and the second positioning rod 19 are both provided with scraper plates below them. The first positioning rod 18 and the second positioning rod 19 are set at different heights. When the decolorizing sand enters from the sand inlet 2, it reaches the discharge hopper 12. Here, the rotation of the motor drives the rotating rod 16 to rotate, and the first and second positioning rods 19 connected to the rotating rod 16 are also driven to rotate, thereby achieving the stirring and uniform distribution of the decolorizing sand. In addition, the bottom spiral rod 17 is driven by the motor, and its rotation will cause the decolorizing sand to enter the discharge pipe 15 and be transported to the decolorizing tank body 1 below, effectively stirring the decolorizing sand and making it evenly distributed inside the decolorizing tank body 1. This ensures that the decolorizing sand fully contacts the solvent oil, improving the decolorization efficiency and quality. The inclined design of the feeding component helps to accelerate the feeding process of the decolorizing sand, while the overflow port 20 on one side of the positioning plate 11 can effectively prevent the accumulation of material during the feeding process and maintain the stable operation of the system. This helps to avoid the material clogging the discharge port or the inlet, thereby reducing the failure and downtime in production.

[0026] like Figure 5 , Figure 6 As shown, the cleaning assembly also includes a rotating column 24 rotatably mounted on the bottom of the decolorizing tank body 1, and a mounting bracket 26 rotatably mounted on the rotating column 24. The mounting bracket 26 is arranged in a cross shape, and a first rotating shaft 27 and a second rotating shaft 30 are rotatably mounted on the four corners of the mounting bracket 26, respectively. A rotating motor 23 is also fixedly mounted on one side of the cleaning box 21. A positioning gear 25 is provided on the outside of the rotating column 24. The positioning gear 25 is arranged in a double-layer gear structure. A rotating gear is provided at the output end of the rotating motor 23. One layer of the positioning gear 25 is connected to the rotating gear through a track. A stirring rod 28 is provided on both sides below the first rotating shaft 27, and a mounting bracket 26 is fixedly mounted below the stirring rod 28. Equipped with stirring blades 29, two stirring rods 28 are staggered, and driven wheels are fixedly connected to the top of the two first rotating shafts 27. The driven wheels are connected to the other gear belt of the positioning gear 25. Scrapers 31 are provided at the bottom of the two second rotating shafts 30. The bottom of one scraper 31 is in contact with the inner bottom surface of the cleaning box 21, and the side of the other scraper 31 is in contact with the inner wall of the cleaning box 21. A cleaning outlet 22 is rotatably installed at the bottom of the cleaning box 21. A cylinder 32 is fixedly installed on one side of the cleaning box 21. The telescopic end of the cylinder 32 is rotatably connected to one side of the cleaning outlet 22. The cleaning outlet 22 is fan-shaped, and a cross-shaped support frame 33 is fixedly installed at the bottom of the cleaning box 21. When it is necessary to clean the oil stains at the bottom of the decolorizing tank body 1, the operator starts the rotating motor 23. The output end of the rotating motor 23 drives the rotating gear to connect with the positioning gear 25. Through the track drive, the positioning gear 25 interacts with the positioning gear 25 on the rotating column 24, causing the entire mounting frame 26 to rotate. Next, the positioning gear 25 above the rotating column 24 is connected to the first rotating shaft 27 of the mounting frame 26, which drives the stirring rod 28 below the first rotating shaft 27 to drive the stirring blade 29 to stir and clean the oil stains at the bottom of the decolorizing tank body 1, ensuring thorough cleaning. At this time, the second rotating shaft 30 rotates with the mounting frame 26, driving the scraper 31 at the bottom to clean the oil stains out of the decolorizing tank body 1 through the cleaning outlet 22. The scraper 31 on one side scrapes the oil stains at the bottom and the scraper on the other side scrapes the oil stains on the side wall, finally sending them to the cleaning outlet 22. The cylinder 32 can control the opening and closing of the cleaning outlet 22 to ensure smooth oil discharge.

[0027] like Figure 8 , Figure 9 As shown, the included angles between the decolorizing tank body 1 and the sand inlet 2 outside the decolorizing tank body 1 are 30° and 45° respectively, and the included angles between the decolorizing tank body 1 and the oil inlet channel at the top of the decolorizing tank body 1 are set to 45° and 15° respectively, and the included angles are all welded and filled. Setting the angles between the inclined connecting pipe and the decolorizing tank body 1 to 30° and 45°, for example, at the sand inlet 2, the angles between the top oil inlet channel and the decolorizing tank body 1 are set to 45° and 15° respectively, and welding filling at the angles can optimize the stability and sealing of the pipe connection. This setting helps to ensure that the pipe connection is firm, prevents oil leakage and loosening, thereby improving the reliability and safety of the equipment. In addition, welding filling can also enhance the corrosion resistance of the connection parts, extend the service life, reduce maintenance costs and downtime. Furthermore, the angles between the inclined connecting pipe and the decolorizing tank body 1 are 30° and 45° respectively, which allows the fluid to flow more smoothly through the pipe, reduces fluid resistance, and improves the conveying efficiency. At the same time, this angle setting is also conducive to fluid mixing, promoting full contact and reaction of various substances during the decolorization process.

[0028] like Figure 2 As shown, a lighting lamp 5 is provided on one side of the decolorizing tank body 1, and a discharge window 7, a lower liquid level controller 8 and an upper liquid level controller 9 are provided on the other side of the decolorizing tank body 1. The discharge window 7 is located above the decolorizing packing 4, and the lower liquid level controller 8 and the upper liquid level controller 9 are located below the decolorizing packing 4. An oil level controller 10 is also provided on the upper side of one side of the decolorizing tank body 1. A lighting lamp 5 is installed on the side of the decolorization tank body 1 to provide sufficient light for operators to observe and operate inside the tank. A discharge window 7 is located on the other side for easy removal of the processed product. An upper liquid level controller 9 and a lower liquid level controller 8 are also installed to monitor the liquid level inside the tank, ensuring the accuracy and stability of liquid level control during production. An oil level controller 10 is located on the upper side of the tank to monitor and control the oil level inside, maintaining the oil within an appropriate range. This setup improves the automation of the production process, ensuring convenient operation and stable production.

[0029] like Figure 1 As shown, the vacuum system also includes a vacuum separation system; The vacuum separation system in the vacuum system includes components such as a gas-liquid separation tower, oil separator, evaporator, separation chamber, extraction chamber, sight glass, photoelectric switch, defoaming solenoid valve, and oil tank. The oil separator evenly disperses the oil onto the evaporator, which forms an extremely thin oil film, increasing the surface area and maximizing exposure to the gas phase for optimal dehydration and degassing. The separation chamber, located between the evaporator and the oil tank, uses vacuum to separate water and gas. The extraction chamber, located at the top of the gas-liquid separation tower, extracts the separated water vapor and gas to prevent them from re-dissolving into the oil. A tempered glass sight glass is used to prevent the lens from denting or deforming under high temperature and high vacuum conditions. A photoelectric switch automatically detects and controls foam, promptly eliminating it from the oil. The separated oil is collected in the oil tank and discharged by a circulating pump. The integration of these components effectively achieves oil separation and processing, ensuring stable system operation and high efficiency.

[0030] A solvent decolorization process for polyethylene fiber production, using the aforementioned polyethylene fiber production solvent decolorization production system and decolorization tank, includes the following steps: S1: Open the sand inlet vacuum valve, turn on vacuum pump 2, open sand inlet valve 1 and sand inlet valve 2, and use the vacuum negative pressure principle to draw the decolorizing sand into the body of decolorizing tank 1 and decolorizing tank 2 respectively. Close sand inlet valve 1 and sand inlet valve 2 according to the mixing ratio requirements. S2: Open the inlet valve of the solvent oil before decolorization, start vacuum pump one, the oil enters the heater after passing through coarse filter one, and then enters the gas-liquid separation tower. Water vapor is drawn out by vacuum pump one and enters the condenser. Water condenses into water and gas is discharged. Stop vacuum pump one, stop the circulation pump, and close the internal circulation valve. S3: Open the decolorizing oil inlet valve, close the internal circulation valve, start the circulation pump, and discharge the treated solvent oil into the body of the No. 1 decolorizing tank and the body of the No. 2 decolorizing tank. After reaching the oil controller position, the oil inlet will automatically stop. Open the decolorizing vacuum valve and start the second vacuum pump to allow the solvent oil to quickly accumulate at the bottom of the decolorizing tank body 1 after decolorizing from the decolorizing sand. S4: When the oil level reaches the height of the upper liquid level controller 9, the oil outlet valve is opened and the oil outlet pump is started. The oil passes through the coarse filter 2 and the fine filter, flows into the oil outlet flow meter, and then flows out from the oil outlet valve and is collected in the finished solvent oil tank. When the oil level drops to the lower liquid level control, the oil outlet pump stops running. S5: Close the desanding vacuum valve, open the sand blowing air valve, and then open the air valve. The oil in the decolorizing tank body 1 is blown out by the gas and accumulates in the lower part of the decolorizing tank body 1. S6: After closing the air valve, close the sand blowing air valve, open the discharge window sealing plate on the decolorizing tank body 1, open the sand suction control main valve, turn on the vacuum pump 2 to suck out the decolorizing sand in the decolorizing tank body 1, finally adjust the suction speed, restore the valve to the closed state after suction, and replace the waste sand collection vehicle. Compared to existing technologies, in the decolorization system, the decolorizing sand is drawn into decolorization tanks No. 1 and No. 2 by opening the sand inlet vacuum valve and utilizing the negative pressure of vacuum pump No. 2. After ensuring the required weight ratio of the decolorizing sand, the sand inlet valve is closed, vacuum pump No. 2 is stopped, and the sand inlet vacuum valve is closed. This step ensures accurate addition and ratio control of the decolorizing sand. Secondly, during the solvent oil circulation heating dehydration and degassing process, the solvent oil inlet valve before decolorization is opened first, vacuum pump No. 1 is started, and the solvent oil is forced through the inlet valve and filtered through coarse filter No. 1 to remove large particulate impurities before being sent to the heater for heating. In the heater, the solvent oil forms fine oil columns, which are then dispersed... The oil film, with a large specific surface area, forms on the evaporator. Under vacuum, the water vapor breaks through and escapes, achieving dehydration and degassing. The oil, driven by the circulation pump, returns to the heater inlet through the internal circulation valve. After approximately 20 minutes of internal circulation, all moisture and gas are removed from the solvent oil. The separated water vapor is drawn out by vacuum pump one and enters the condenser, where it condenses into water and accumulates at the bottom of the condenser, exiting through the drain valve. The gas is discharged through the vacuum pump exhaust port. Finally, vacuum pump one is stopped, the circulation pump is stopped, and the internal circulation valve is closed. Then, during the decolorization process of adding the solvent oil to the decolorization tank, the decolorization inlet valve is opened, the internal circulation valve is closed, and the circulation is restarted. The treated solvent oil is pumped into decolorizing tanks No. 1 and No. 2 through the decolorizing inlet valve and inlet flow meter, respectively, until the oil reaches the oil level controller position and automatically stops. Then, the decolorizing vacuum valve is opened, and vacuum pump No. 2 is started, allowing the solvent oil to be rapidly decolorized and accumulate at the bottom of the decolorizing tank. When the oil level in the decolorizing tank rises to the height of the upper liquid level controller 9, the outlet valve is opened, and the outlet pump is started. After being filtered through coarse filter No. 2 and fine filter, the solvent oil flows out from the outlet valve and is collected in the dedicated finished solvent oil tank after decolorization. When the oil level in the decolorizing tank drops to the lower liquid level control, the outlet pump automatically stops running. Afterwards, the decolorizing sand drying process... In the process, after closing the desanding vacuum valve and opening the sand blowing vent valve, the air valve is opened, creating a large pressure difference inside the decolorizing tank. The oil in the decolorized sand is quickly blown out by the gas, and the oil accumulates at the bottom of the decolorizing tank. As the blowing time is extended, the oil content in the decolorized sand gradually decreases. Finally, during the discharge of waste decolorized sand, after observing that no oil flows out with the airflow, the air valve and sand blowing vent valve are closed, the discharge window sealing plate on the decolorizing tank is opened, the sand suction control main valve is opened, the quick connector between the tank and the waste sand collection vehicle is connected, and the vacuum pump is started to suck out the waste decolorized sand from the decolorizing tank. After suction, all valves are returned to their original closed state to ensure that the system is in normal working condition.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention includes the claims being limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0032] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A solvent decolorization production system for polyethylene fiber production, characterized in that, It includes a production system, which comprises an oil delivery system, a heating system, a vacuum system, a filtration system, a liquid level system, a condensation system, a decolorization system, a sand blowing system, a sand suction system, an electrical control system, and auxiliary systems. The oil delivery system includes an oil outlet valve, a circulation pump, an oil outlet pump, an oil flow meter, a coarse filter I, and a fine filter II. The heating system includes a heater. The vacuum system includes a vacuum pump I, a vacuum pump II, and a condenser. The filtration system includes a coarse filter and a fine filter. The liquid level system includes an upper liquid level controller (8) and a lower liquid level controller (9). The condensation system includes a condenser. The decolorization system includes two decolorization tank bodies (1) and a decolorization vacuum valve. The sand blowing system includes a sand blowing outlet valve, an air valve, and a discharge window sealing plate. The sand suction system includes a sand suction control. The main valve and vacuum pump 2; a cleaning assembly is provided at the bottom of the decolorizing tank body (1). The cleaning assembly includes a cleaning box (21) fixedly installed below the decolorizing tank body (1), a rotating column (24) rotatably installed at the bottom of the decolorizing tank body (1), and a cross-shaped mounting bracket (26) rotatably installed on the rotating column (24). Two first rotating shafts (27) and two second rotating shafts (30) are rotatably installed at the four ends of the mounting bracket (26). A rotating motor (23) is fixedly installed on one side of the cleaning box (21). The outside of the rotating column (24) is equipped with a cleaning assembly. A positioning gear (25) with a double-layer gear structure is provided. A rotating gear is provided at the output end of the rotating motor (23). One layer of the positioning gear (25) is connected to the rotating gear via a chain. Stirring rods (28) are provided on both sides below the first rotating shaft (27). Stirring blades (29) are fixedly installed below each stirring rod (28). The two stirring rods (28) are staggered. Driven wheels are fixedly connected to the top ends of the two first rotating shafts (27). The driven wheels are connected to the other layer of the positioning gear (25) via a belt drive. The bottom end of the second rotating shaft (30) is provided with a scraper (31), the bottom end of one of the scrapers (31) is in contact with the inner bottom surface of the cleaning box (21), and one side of the other scraper (31) is in contact with the inner wall of the cleaning box (21); the bottom end of the cleaning box (21) is rotatably installed with a fan-shaped cleaning outlet (22), a cylinder (32) is fixedly installed on one side of the cleaning box (21), the telescopic end of the cylinder (32) is rotatably connected to one side of the cleaning outlet (22), and a cross-shaped support frame (33) is fixedly installed at the bottom end of the cleaning box (21).

2. The polyethylene fiber production solvent decolorization system according to claim 1, characterized in that, The vacuum system also includes a vacuum separation system.

3. A solvent decolorization tank for polyethylene fiber production, applied to the solvent decolorization production system for polyethylene fiber production as described in any one of claims 1-2, characterized in that, The decolorizing tank includes a decolorizing tank body (1). A sand inlet (2) and a vent pipe (3) are respectively provided on both sides of the top of the decolorizing tank body (1). A viewing window (6) and a discharge window (7) are also provided on one side of the decolorizing tank body (1). Decolorizing filler (4) is provided inside the decolorizing tank body (1). The discharge window (7) and the viewing window (6) are located on the upper and lower sides of the decolorizing filler (4), respectively. A feeding assembly is also provided inside the sand inlet (2). The feeding assembly is used to process the decolorizing sand before it enters the decolorizing tank body (1). A cleaning assembly is provided at the bottom of the decolorizing tank body (1). The cleaning assembly includes a cleaning box (21) fixedly installed below the decolorizing tank body (1) and a stirring module located inside the cleaning box (21). The stirring module is used to stir and clean the oil stains inside the cleaning assembly. The cleaning assembly also includes a rotating column (24) rotatably installed at the bottom of the decolorizing tank body (1) and a cross-shaped mounting bracket (26) rotatably installed on the rotating column (24). Two first rotating shafts (27) and two second rotating shafts (30) are rotatably installed at the four ends of the mounting bracket (26). A rotating motor (20) is fixedly installed on one side of the cleaning box (21). 3) A positioning gear (25) with a double-layer gear structure is provided on the outside of the rotating column (24). A rotating gear is provided at the output end of the rotating motor (23). One layer of the positioning gear (25) is connected to the rotating gear by a chain. Stirring rods (28) are provided on both sides below the first rotating shaft (27). Stirring blades (29) are fixedly installed below each stirring rod (28). The two stirring rods (28) are staggered. Driven wheels are fixedly connected to the top of each of the two first rotating shafts (27). The driven wheels are connected to the other layer of the positioning gear (25) for transmission. Dynamic connection; scrapers (31) are provided at the bottom ends of the two second rotating shafts (30), one of the scrapers (31) is in contact with the bottom surface of the cleaning box (21), and the other scraper (31) is in contact with the inner wall of the cleaning box (21) on one side; a cleaning outlet (22) in a fan shape is rotatably installed at the bottom end of the cleaning box (21), a cylinder (32) is fixedly installed on one side of the cleaning box (21), the telescopic end of the cylinder (32) is rotatably connected to one side of the cleaning outlet (22), and a cross-shaped support frame (33) is fixedly installed at the bottom end of the cleaning box (21).

4. The solvent decolorization tank for polyethylene fiber production according to claim 3, characterized in that, The feeding assembly includes a positioning plate (11) fixedly installed inside the sand inlet (2) and a discharge hopper (12) disposed below the positioning plate (11). An inclined feeding hopper (14) is disposed on one side of the top of the positioning plate (11). A reduction motor (13) is disposed in the middle of the positioning plate (11). The output end of the reduction motor (13) passes through the positioning plate (11). A rotating rod (16) is rotatably installed inside the discharge hopper (12). The rotating rod (16) is fixedly connected to the output end of the reduction motor (13). A discharge pipe (15) is also disposed at the bottom of the discharge hopper (12).

5. The solvent decolorization tank for polyethylene fiber production according to claim 4, characterized in that, The feeding assembly is installed at an inclination inside the sand inlet (2), the feeding hopper (14) is also set at an inclination, a screw rod (17) is fixedly sleeved below the reduction motor (13), the screw rod (17) is located inside the upper part of the discharge pipe (15), an overflow port (20) is also opened on one side of the positioning plate (11), and a first positioning rod (18) and a second positioning rod (19) are fixedly connected to the output end of the reduction motor (13) respectively. A scraper is set below the first positioning rod (18) and the second positioning rod (19), and the first positioning rod (18) and the second positioning rod (19) are set at different heights.

6. The solvent decolorization tank for polyethylene fiber production according to claim 3, characterized in that, The included angles between the decolorizing tank body (1) and the sand inlet (2) outside the decolorizing tank body (1) are 30° and 45° respectively. The included angles between the decolorizing tank body (1) and the oil inlet channel at the top of the decolorizing tank body (1) are set to 45° and 15° respectively, and the included angles are all welded and filled.

7. The solvent decolorization tank for polyethylene fiber production according to claim 3, characterized in that, A lighting lamp (5) is provided on one side of the decolorizing tank body (1). A discharge window (7), a lower liquid level controller (8) and an upper liquid level controller (9) are respectively provided on the other side of the decolorizing tank body (1). The discharge window (7) is located above the decolorizing filler (4). The lower liquid level controller (8) and the upper liquid level controller (9) are located below the decolorizing filler (4). An oil level controller (10) is also provided on one side of the decolorizing tank body (1).

8. A solvent decolorization process for polyethylene fiber production, using the polyethylene fiber production solvent decolorization production system as described in any one of claims 1-2 and the decolorization tank as described in any one of claims 3-7, characterized in that, Includes the following steps: S1: Open the sand inlet vacuum valve, turn on vacuum pump two, open sand inlet valve one and sand inlet valve two, and use the vacuum negative pressure principle to suck the decolorizing sand into decolorizing tank one and decolorizing tank two respectively. Close sand inlet valve one and sand inlet valve two according to the mixing ratio requirements. S2: Open the inlet valve of the solvent oil before decolorization, start vacuum pump one, the oil enters the heater after passing through coarse filter one, and then enters the gas-liquid separation tower. Water vapor is drawn out by vacuum pump one and enters the condenser. Water condenses into water and gas is discharged. Stop vacuum pump one, stop the circulation pump, and close the internal circulation valve. S3: Open the decolorizing oil inlet valve, close the internal circulation valve, start the circulation pump, and discharge the processed solvent oil into the No. 1 decolorizing tank and the No. 2 decolorizing tank. After reaching the oil level controller position, the oil inlet will automatically stop. Open the decolorizing vacuum valve and start the vacuum pump 2 to allow the solvent oil to quickly accumulate at the bottom of the decolorizing tank body (1) after decolorizing from the decolorizing sand. S4: When the oil level reaches the height of the upper liquid level controller (9), open the oil outlet valve and start the oil outlet pump. The oil passes through the coarse filter 2 and the fine filter, flows into the oil outlet flow meter, and then flows out from the oil outlet valve and is collected in the finished solvent oil tank. When the oil level drops to the lower liquid level controller, the oil outlet pump stops running. S5: Close the desanding vacuum valve, open the sand blowing air valve, and then open the air valve. The oil in the decolorizing tank body (1) is blown out by the gas and accumulates in the lower part of the decolorizing tank body (1). S6: After closing the air valve, close the sand blowing air valve, open the discharge window sealing plate on the decolorizing tank body (1), open the sand suction control main valve, turn on the vacuum pump two to suck out the decolorizing sand in the decolorizing tank body (1), finally adjust the suction speed, restore the valve to the closed state after suction, and replace the waste sand collection vehicle. S7: When it is necessary to clean the oil stains at the bottom of the decolorizing tank body (1), start the rotating motor (23). The rotating motor (23) drives the rotating column (24) and the mounting bracket (26) to rotate through the rotating gear, chain and positioning gear (25). The first rotating shaft (27) is driven to rotate through the belt drive of the other gear of the positioning gear (25) and the driven wheel. The staggered stirring rods (28) and stirring blades (29) stir and loosen the oil stains in the cleaning tank (21). At the same time, the scrapers (31) on the two second rotating shafts (30) scrape off the oil stains on the bottom surface and inner wall of the cleaning tank (21). The cleaning outlet (22) with a fan shape is opened by the cylinder (32) to discharge the oil stains.

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