Wet non-woven fabric circulating water online pretreatment system

Abstract

The utility model discloses a wet process non-woven fabric circulating water on-line pretreatment system which comprises a pretreatment device, an air floatation tank, a middle water tank, a clear water tank and a slag cylinder, a water outlet of the pretreatment device is connected with an inlet of the air floatation tank, a slag discharge port is connected with the slag cylinder, a water outlet is arranged on the upper portion of the side wall of the air floatation tank, and the water outlet of the air floatation tank is connected with the middle water tank. The middle water tank is provided with a liquid level transmitter and is connected with a clear water tank through a water delivery pump, and the clear water tank is provided with a liquid level transmitter. By adopting an efficient pre-filtering mode, fibers in circulating water are concentrated, and the amount of fibers entering air floatation is reduced, so that the treatment capacity of the air floatation tank is improved, the turbidity of water discharged by air floatation is greatly reduced, the filtering pressure and cost of a subsequent high-precision filtering device are greatly reduced, the cleanliness of a water body is improved, and the service life of the water body is prolonged. Water needle patterns on the cloth surface are improved; the defect number is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric production technology, and in particular to an online pretreatment system for circulating water in wet nonwoven fabric production. Background Art

[0002] Currently, wet-laid nonwoven fabric technology is a new technology that utilizes papermaking equipment and techniques to produce nonwoven fabric products. The process involves dispersing fiber raw materials into single fibers in an aqueous medium, while simultaneously mixing different fiber raw materials to create a fiber suspension. This suspension is then transported to a web-forming mechanism, where the fibers are formed into a web in a wet state and subsequently reinforced into fabric. During production, fine pulp fibers and ash remain in the circulating water, requiring the use of air flotation to remove these fine fibers and ash before the circulating water can be reused. However, directly treating untreated circulating water using an air flotation tank cannot completely remove suspended solids, leading to difficulties in subsequent high-precision filtration and high filtration costs.

[0003] Patent application CN117888380A discloses a toilet paper fiber recycling machine and method. The toilet paper fiber recycling machine includes a fixed housing, an upper housing, a shredding component, a separation component, a water spraying component, a bubble injection component, a recycling component, and a cleaning component. The upper housing is fixedly installed on top of the fixed housing. The shredding component is installed outside the fixed housing. The separation component is installed obliquely inside the fixed housing. The water spraying component is installed inside the upper housing. The bubble injection component is installed on the side of the fixed housing and is used to inject bubbles into the pulp to remove pigment impurities. The recycling component is installed inside the bubble injection component, and the cleaning component is installed inside the bubble injection component to clean the residual pulp after discharge. This technical solution solves the problem in the prior art where the viscosity of the pulp makes it difficult to completely remove the separated pigment impurities.

[0004] However, this patent uses the method of injecting air bubbles into the pulp to agitate the pulp fibers in order to screen for pigment impurities. This method can only play an auxiliary screening role and cannot achieve solid-liquid separation of the material.

[0005] Utility model patent CN221701169U discloses a wastewater treatment fiber recycling machine, which facilitates the pushing and cleaning of fibers to prevent clogging and affect the filtration effect. It includes a recycling bin, multiple legs, and a support ring. Multiple legs are evenly fixedly installed at the four corners of the bottom of the recycling bin, and the bottom ends of the legs are fixedly installed on the top of the support ring to ensure stability during use. It also includes a mesh cylinder, a support rotating ring, a rotating device, a cleaning device, a height adjustment device, and an air outlet device. The support rotating ring is fixedly installed on the top of the mesh cylinder and rotatably mounted on the top of the recycling bin. The rotating mechanism is installed at the bottom of the recycling bin and connected to the bottom of the mesh cylinder. The height adjustment device is installed on the rear side wall of the recycling bin. The cleaning device is located inside the mesh cylinder, and its top is mounted on the height adjustment device. The air outlet device is installed on the top of the height adjustment device, and its output end is located inside the mesh cylinder.

[0006] However, compared to this patent, the structure of that patent is more complex, the filtration area is smaller, and it is difficult to separate large quantities of low-concentration slurries. Utility Model Content

[0007] This invention aims to provide an online pretreatment system for circulating water in wet nonwoven fabrics. It adopts a highly efficient pre-filtration method to concentrate the fibers in the circulating water, reducing the amount of fibers entering the flotation tank, thereby improving the treatment capacity of the flotation tank, significantly reducing the turbidity of the flotation effluent, greatly reducing the filtration pressure and cost of subsequent high-precision filtration devices, improving water cleanliness, improving water needle marks on the fabric surface, and reducing the number of defects.

[0008] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0009] An online pretreatment system for circulating water in wet-process nonwoven fabrics includes a pretreatment device, a flotation tank, an intermediate water tank, a clear water tank, and a sludge cylinder.

[0010] The pretreatment device includes a shell, a rotating drum, and a central shaft. The rotating drum is located inside the shell and is a hollow cylindrical structure. The central shaft passes through the rotating drum axially, and its two ends extend through the shell to the outside of the shell. The central shaft is rotatably connected to the shell, and one end of the central shaft is connected to a drive assembly. A water outlet is provided at the bottom of the shell. Multiple holes are opened on the side wall of the rotating drum, and a spiral guide groove is provided on the inner surface of the side wall of the rotating drum. The spiral guide groove and the inner surface of the side wall of the rotating drum together form a flow channel. An annular opening is provided at the middle of one end face of the rotating drum, and the water inlet pipe extends into the interior of the rotating drum through the annular opening. The other end face of the rotating drum is an open structure, and a slag discharge port is provided in the shell below the open structure. A screen is fitted on the outside of the rotating drum.

[0011] The outlet of the pretreatment device is connected to the inlet of the flotation tank, and the slag discharge port is connected to the slag cylinder. The upper part of the side wall of the flotation tank is provided with an outlet. The outlet of the flotation tank is connected to the intermediate water tank. The intermediate water tank is equipped with a level transmitter. The intermediate water tank is connected to the clear water tank through a water pump. The clear water tank is equipped with a level transmitter.

[0012] The top of the intermediate water tank is also equipped with a water inlet, and the water inlet is equipped with a water supply valve.

[0013] The inlet of the pretreatment device is equipped with a flow regulating valve.

[0014] The guide channel is a 100mm high strip metal plate spirally welded to the inner surface of the drum side wall.

[0015] The central shaft is fixedly connected to the inner wall of the drum via multiple connecting rods.

[0016] The drive assembly includes a motor and a reducer. The output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to one end of the central shaft.

[0017] The central shaft is rotatably connected to the housing via a fixed drum bearing and a bearing seat. The bearing seat is fixedly connected to the housing, the fixed drum bearing is fixedly connected to the central shaft, and the bearing seat and the fixed drum bearing are rotatably engaged.

[0018] The shell includes an upper shell and a lower shell. The upper shell is a hollow semi-cylindrical structure, and the lower shell is a funnel-shaped structure. The upper shell and the lower shell are sealed together, and the water outlet is located at the bottom of the funnel-shaped structure of the lower shell.

[0019] The upper and lower housings are sealed together by a connecting ring, which is a long flange that is fixed with bolts and has a sealing strip.

[0020] The pretreatment device is provided in two parts. The slag discharge port of each pretreatment device is connected to the slag cylinder, and the water outlet of each pretreatment device is connected to the flotation tank.

[0021] The beneficial effects of this utility model are:

[0022] 1. The circulating water pretreatment filtration device of this utility model has the characteristics of simple structure, high efficiency, high degree of automation, no need for active cleaning, and low maintenance cost.

[0023] 2. This utility model has a positive effect on the water treatment effect of flotation tank, reducing the amount of wood pulp fiber entering the flotation tank by 70%, increasing the water treatment flow rate of the flotation tank, reducing flotation sludge discharge, reducing the amount of flotation reagents, reducing the backwashing time of the filter and thus reducing the backwashing drainage volume, and extending the service life of the filter bag. It has an important and positive impact on energy conservation and emission reduction.

[0024] 3. This utility model adopts a highly efficient pre-filtration method to concentrate the fibers in the circulating water, reducing the amount of fibers entering the flotation tank by 70%-80%, thereby improving the treatment capacity of the flotation tank. The flotation tank can fully separate all the fibers and ash in the treatment liquid, significantly reducing the turbidity of the flotation effluent, greatly reducing the filtration pressure and cost of subsequent high-precision filtration devices, improving water cleanliness, improving water needle marks on the fabric surface, and reducing the number of defects.

[0025] 4. In this utility model, 70%-80% of suspended fibers are efficiently removed through pretreatment, improving the cleanliness of production circulating water, extending the subsequent filtration backwashing time, and reducing the daily consumption of clean water by 100-150 cubic meters.

[0026] 5. This utility model improves water cleanliness and reduces the daily cost of filter media by 200 yuan. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the online pretreatment system for circulating water in wet nonwoven fabrics according to this utility model.

[0028] Figure 2 This is a schematic diagram of the pretreatment device of this utility model.

[0029] Figure 3 This is a side view of the pretreatment device of this utility model.

[0030] The components include: 1. Pretreatment device; 2. Flotation tank; 3. Intermediate water tank; 4. Clear water tank; 5. Sludge cylinder; 6. Water pump.

[0031] 11. Shell; 12. Drum; 13. Central shaft; 14. Outlet; 15. Guide channel; 16. Slag discharge port; 17. Inlet pipe; 18. Drive assembly; 19. Bearing housing; 110. Upper shell; 111. Lower shell; 112. Connecting ring. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0033] Example 1

[0034] This embodiment provides a method such as Figure 1-3The illustrated online pretreatment system for circulating water in wet-process nonwoven fabrics includes a pretreatment device 1, an air flotation tank 2, an intermediate water tank 3, a clear water tank 4, and a sludge cylinder 5. The pretreatment device 1 includes a housing 11, a rotating drum 12, and a central shaft 13. The rotating drum 12 is disposed inside the housing 11 and has a hollow cylindrical structure. The central shaft 13 passes through the rotating drum 12 axially, with both ends extending through the housing 11 and outwards. The central shaft 13 is rotatably connected to the housing 11. One end of the central shaft 13 is connected to a drive assembly 18. An outlet 14 is provided at the bottom of the housing 11. The drum 12 has multiple holes on its side wall. The inner surface of the side wall of the drum 12 is provided with a spiral guide groove 15. The spiral guide groove 15 and the inner surface of the side wall of the drum 12 together form a flow channel. An annular opening is provided at the middle position of one end face of the drum 12. The water inlet pipe 17 extends into the inside of the drum 12 through the annular opening. The other end face of the drum 12 is an open structure. The shell 11 below the open structure is provided with a slag discharge port 16. A screen is fitted on the outside of the drum 12. The outlet 14 of the pretreatment device 1 is connected to the inlet of the flotation tank 2. The slag discharge port 16 is connected to the slag cylinder 5. The upper part of the side wall of the flotation tank 2 is provided with an outlet 14. The outlet 14 of the flotation tank 2 is connected to the intermediate water tank 3. The intermediate water tank 3 is provided with a level transmitter. The intermediate water tank 3 is connected to the clear water tank 4 through a water pump 6. The clear water tank 4 is provided with a level transmitter. The guide channel 15 is a 100mm high strip metal plate spirally welded to the inner surface of the side wall of the drum 12; the central shaft 13 is fixedly connected to the inner wall of the drum 12 by multiple connecting rods. The top of the intermediate water tank 3 is also provided with a water inlet, and the water inlet is equipped with a water inlet valve.

[0035] In this embodiment, the holes are 20mm holes, and the holes are evenly spaced at 5mm intervals on the side wall of the drum 12. The screen is a 120-mesh filter screen. The drive assembly 18 includes a motor and a reducer. The output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to one end of the central shaft 13.

[0036] In this embodiment, circulating water is introduced into the inlet of the drum 12 through the inlet pipe 17. The motor drives the drum 12 to rotate. When the drum 12 rotates, the liquid is only distributed at the horizontal bottom of the drum 12 due to gravity. The circulating water flows along the guide channel 15 inside the drum 12. The slurry flows to the slag discharge port 16 with the flow channel and is discharged from the slag discharge port 16. The slag discharge port 16 is connected to the slag bucket by a pipe with a diameter of 159mm. The slurry is discharged into the slag discharge port 16. A 120-mesh metal filter screen is fixed on the surface of the drum 12 as a filter carrier. After the liquid is filtered, it falls into the device housing 11. The filtrate is discharged through the outlet 14 set at the bottom of the housing 11. After the pretreatment device 1 is completed, the filtrate enters the flotation tank 2. The flotation tank 2 injects a large number of microbubbles into the water. The buoyancy of the bubbles carries the suspended solids, oil and other impurities in the water to the surface, thereby achieving solid-liquid separation. This process is not only fast and thorough, but also effectively reduces the burden of subsequent treatment. The upper side wall of the flotation tank 2 is provided with an outlet 14. The outlet of the flotation tank 2 is connected to the intermediate water tank 3 by overflow. The subsurface overflow prevents surface foam from entering the intermediate water tank 3. The intermediate water tank 3 serves as a buffer for the entire return water system. The intermediate water tank 3 is connected to the clean water tank 4 through the water pump 6. The clean water tank 4 serves as a storage tank for clean water after treatment. Both the intermediate water tank 3 and the clean water tank 4 are equipped with level transmitters. The level of the clean water tank 4 and the level of the intermediate water tank 3 are interlocked by DCS. When the level of the clean water tank 4 is lower than the set lower limit, the water pump 6 is started to pump water from the intermediate water tank 3 into the clean water tank 4 to start replenishing water to the clean water tank 4. When the level of the clean water tank 4 is higher than the set upper limit, a stop signal is given to the water pump 6 to stop replenishing water to the clean water tank 4. When the level in intermediate water tank 3 reaches the set low limit, turn off water pump 6 and open the water supply valve to replenish water to intermediate water tank 3. When the level in intermediate water tank 3 reaches the set middle limit, the water supply pump can be started to replenish water to the clear water tank depending on whether the level in the clear water tank has reached the low level. When the level in intermediate water tank 3 reaches the set high limit, close the water supply valve and stop replenishing water to intermediate water tank 3.

[0037] Example 2

[0038] Compared with Embodiment 1, the difference in this embodiment is that, in this embodiment, the connection between the central shaft 13 and the housing 11 is rotatably connected by the fixed drum 12 bearing and the bearing seat 19. The bearing seat 19 is fixedly connected to the housing 11, the fixed drum 12 bearing is fixedly connected to the central shaft 13, and the bearing seat 19 is rotatably engaged with the fixed drum 12 bearing; the rest of the structure is the same as in Embodiment 1.

[0039] In this embodiment, the fixed drum 12 bearing and bearing seat 19 support the rotation of the drum 12, and the end face sealing assembly prevents the liquid filtered inside the housing 11 from splashing and causing liquid to flow out.

[0040] Example 3

[0041] Compared with Embodiment 1, the difference in this embodiment is that, in this embodiment, the shell 11 includes an upper shell 110 and a lower shell 111. The upper shell 110 is a hollow semi-cylindrical structure, and the lower shell 111 is a funnel-shaped structure. The upper shell 110 and the lower shell 111 are sealed together, and the water outlet 14 is located at the bottom of the funnel-shaped structure of the lower shell 111. The upper shell 110 and the lower shell 111 are sealed together by a connecting ring 112, which is a long flange and is fixed with bolts. A sealing strip is provided on the connecting ring 112. The rest of the structure is the same as in Embodiment 1.

[0042] In this embodiment, the upper housing 110 and the lower housing 111 serve to prevent liquid from splashing when the drum 12 rotates. The connecting ring and the sealing strip serve to connect the upper housing 110 and the lower housing 111 and seal the liquid.

[0043] Example 4

[0044] The difference between this embodiment and embodiment 1 is that, in this embodiment, there are two pretreatment devices 1, and the slag discharge port 16 of each pretreatment device 1 is connected to the slag cylinder 5, and the water outlet 14 of the pretreatment device 1 is connected to the flotation tank 2; the water inlet of the pretreatment device 1 is equipped with a flow regulating valve; the rest of the structure is the same as in embodiment 1.

[0045] In this embodiment, the function of setting up two pretreatment devices 1 is to remove 70%-80% of suspended fibers and improve the cleanliness of production circulating water. The flow regulating valve is used to individually regulate the amount of water entering the pretreatment device 1. When one of the pretreatment devices 1 is under maintenance or its treatment capacity is insufficient, the flow regulating valve can be used to close or control the amount of water entering a single pretreatment device 1 to achieve the purpose of controlling the amount of water.

[0046] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An online pretreatment system for circulating water in wet-laid nonwoven fabrics, characterized in that: The system includes a pretreatment device (1), an air flotation tank (2), an intermediate water tank (3), a clear water tank (4), and a sludge cylinder (5). The pretreatment device (1) includes a shell (11), a rotating drum (12), and a central shaft (13). The rotating drum (12) is located inside the shell (11) and is a hollow cylindrical structure. The central shaft (13) passes through the rotating drum (12) axially. Both ends of the central shaft (13) extend through both ends of the shell (11) to the outside of the shell (11). The central shaft (13) is rotatably connected to the shell (11). One end of the central shaft (13) is connected to a drive assembly (18). An outlet (14) is provided at the bottom of the shell (11). Multiple holes are provided on the side wall of the rotating drum (12). A spiral guide groove (15) is provided on the inner surface of the side wall of the rotating drum (12). The spiral guide groove (15) is connected to the rotating drum (12). The inner surface of the side wall of the drum (12) forms a flow channel. An annular opening is provided at the middle position of one side end face of the drum (12). The water inlet pipe (17) extends into the inside of the drum (12) through the annular opening. The other side end face of the drum (12) is an open structure. The shell (11) below the open structure is provided with a slag discharge port (16). A screen is fitted on the outside of the drum (12). The outlet (14) of the pretreatment device (1) is connected to the inlet of the flotation tank (2). The slag discharge port (16) is connected to the slag cylinder (5). The upper part of the side wall of the flotation tank (2) is provided with an outlet (14). The outlet (14) of the flotation tank (2) is connected to the intermediate water tank (3). The intermediate water tank (3) is provided with a level transmitter. The intermediate water tank (3) is connected to the clear water tank (4) through the water pump (6). The clear water tank (4) is provided with a level transmitter.

2. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The top of the intermediate water tank (3) is also provided with a water inlet, and the water inlet is equipped with a water inlet valve.

3. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The inlet of the pretreatment device (1) is equipped with a flow regulating valve.

4. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The central shaft (13) is fixedly connected to the inner wall of the drum (12) by multiple connecting rods.

5. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The drive assembly (18) includes a motor and a reducer. The output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to one end of the central shaft (13).

6. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The connection between the central shaft (13) and the housing (11) is rotatably connected by a fixed drum (12) bearing and a bearing seat (19). The bearing seat (19) is fixedly connected to the housing (11), the fixed drum (12) bearing is fixedly connected to the central shaft (13), and the bearing seat (19) is rotatably engaged with the fixed drum (12) bearing.

7. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The shell (11) includes an upper shell (110) and a lower shell (111). The upper shell (110) is a hollow semi-cylindrical structure, and the lower shell (111) is a bucket-shaped structure. The upper shell (110) and the lower shell (111) are sealed together, and the water outlet (14) is located at the bottom of the bucket-shaped structure of the lower shell (111).

8. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 7, characterized in that: The upper housing (110) and the lower housing (111) are sealed together by a connecting ring (112). The connecting ring is a long flange and is fixed with bolts. A sealing strip is provided on the connecting ring (112).

9. The wet-laid nonwoven fabric circulating water online pretreatment system according to claim 1, characterized in that: The pretreatment device (1) is provided in two parts. The slag discharge port (16) of each pretreatment device (1) is connected to the slag cylinder (5), and the water outlet (14) of the pretreatment device (1) is connected to the flotation tank (2).

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