An apparatus for homogenously dispensing a dispersant solution

Abstract

The utility model discloses a device of even deployment dispersing agent solution relates to wet method wood pulp composite cloth production technical field, including deployment bucket, hopper and overflow bucket, and the overflow bucket is connected with the water inlet pipeline, and the water inlet pipeline is provided with water inlet valve, and one side of overflow bucket is provided with overflow plate, and one end of overflow plate is connected with the overflow port of overflow bucket, and the other end of overflow plate extends to deployment bucket inside obliquely downward, and hopper is located overflow plate top, and the discharge port of hopper extends to overflow plate direction, and hopper discharge port is provided with discharge valve, and the discharge port of deployment bucket is connected buffer tank. Through overflow plate and hopper top of overflow plate, to improve dispersing agent solubility and solution concentration stability, reduce manual intervention and labor intensity, avoid product cloud spot, wave line, foreign matter defect such as defect because of dispersing agent deployment problem, guarantee wood pulp fiber forming quality and production continuity.

Description

Technical Field

[0001] This utility model relates to the field of wet-process wood pulp composite fabric production technology, and in particular to an apparatus for uniformly dispersing a dispersant solution. Background Technology

[0002] Currently, in the production of wet-process wood pulp composite products, dispersants are required to act on the wood pulp fibers, ensuring uniform dispersion during the inclined wire forming process. However, dispersants are high-molecular-weight substances that dissolve in water, forming an aqueous solution of a certain viscosity. During production, this dispersant needs to be added manually, little by little, to a mixing tank, with continuous stirring. Furthermore, too much dispersant must be added, otherwise it will form viscous clumps upon contact with water, making it difficult to disperse. Simultaneously, the stirring time cannot be too long, otherwise depolymerization will occur, and the dispersant will lose its fiber-dispersing effect. Therefore, manually preparing the dispersant carries the risk of uneven addition causing clumping. If this clumping occurs during the inclined wire forming process due to vacuum instability, it can create wavy patterns or cloudiness, resulting in substandard products.

[0003] In the production of wet-process wood pulp composite products, a dispersant is required to assist in the formation of the wood pulp fibers during the skein weave process, ensuring a uniform wood pulp layer. Without the dispersant, the produced spunlace fabric will exhibit cloudiness. The dispersant is a solid powdered polymer, prepared manually by gradually pouring it into a mixing tank equipped with a stirrer along the water inlet. After stirring for 25 minutes, stirring is stopped and the solution is set aside. When the dispersant solution level in the buffer tank below the mixing tank drops below 0.5m, the prepared dispersant solution is transferred into the buffer tank. At this point, the viscosity of the dispersant solution must be manually checked to ensure it has sufficient viscosity. If not, additional dispersant must be added to increase the viscosity, ensuring the dispersant remains effective and can interact with the wood pulp fibers. This process is entirely manual, but inherently involves some instability.

[0004] Firstly, the dispersant is added manually by pouring it into the water outlet, allowing the solid powder particles to be carried into the mixing tank by the water flow for stirring, dispersion, and dissolution. Manual pouring makes it difficult to accurately control the amount of dispersant poured, easily resulting in over-pouring and causing the dispersant to clump upon contact with water. Clumped dispersant is difficult to disperse and dissolve. Furthermore, the amount of dispersant needs to be manually weighed each time it is prepared. Also, given a constant pulp concentration, changes in the amount of sizing (a difference of more than 10g in the basis weight of the wood pulp layer) require corresponding adjustments to the dispersant dosage. A higher sizing amount necessitates a lower dispersant concentration; otherwise, the wood pulp fibers will aggregate during the spunlace forming process and transfer along the spunlace mesh to the nonwoven fabric, causing unevenness in the spunlace fabric.

[0005] Secondly, once the dispersant solution is prepared, it is easily affected by temperature (water temperature, ambient temperature). The higher the temperature, the more severe the depolymerization, and it may even become ineffective. It is necessary to manually add more dispersant to increase the concentration of the dispersant solution. Utility Model Content

[0006] This invention aims to provide a device for uniformly distributing a dispersant solution. Through an overflow plate and a hopper above the overflow plate, it improves the uniformity of dissolution of the dispersant and the stability of the solution concentration, reduces manual intervention and labor intensity, avoids defects such as cloudiness, wavy lines, and foreign matter defects in the product caused by dispersant mixing problems, and ensures the quality of wood pulp fiber molding and production continuity.

[0007] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows: An apparatus for uniformly dispersing a dispersant solution includes a mixing tank, a hopper, and an overflow tank. The overflow tank is connected to a water inlet pipe, which is equipped with a water inlet valve. An overflow plate is provided on one side of the overflow tank, with one end of the overflow plate connected to the overflow port of the overflow tank and the other end of the overflow plate extending obliquely downward into the mixing tank. The hopper is located above the overflow plate, with its outlet extending towards the overflow plate and equipped with a discharge valve. The outlet of the mixing tank is connected to a buffer tank.

[0008] The overflow plate is made of stainless steel. One end of the overflow plate is fixed to the overflow port of the overflow tank, and the other end of the overflow plate extends horizontally downward at a 45-degree angle into the mixing tank. The overflow plate has a fan-shaped structure with an inner arc of 150mm, an outer arc of 250mm, and a length of 220mm. Baffles are provided on both sides of the overflow plate.

[0009] Smooth small balls for dispersing the dispersant are provided between the discharge port of the hopper and the overflow plate.

[0010] The smooth ball is positioned 120mm above the center of the overflow plate, and the hopper outlet is located 50mm directly above the smooth ball. The smooth ball is fixed above the overflow plate by a support frame, with the baffles on both sides of the overflow plate as support points.

[0011] The mixing tank is equipped with a frame-type stirrer.

[0012] A viscosity sensor is installed inside the mixing tank.

[0013] The mixing tank is equipped with a level transmitter.

[0014] A weight transmitter is installed at the bottom of the hopper; the weight transmitter is fixed on one side of the hopper, near the bottom. At startup, the weight sensor transmits a control signal to the solenoid valve below the hopper, which then controls the valve to open and begin dispensing. Simultaneously, the water inlet valve receives the dispensing signal and opens the water outlet valve. Once the required weight of dispersant has been dispensed, a signal is transmitted to control the solenoid valve to close the dispensing. If the dispersant concentration is insufficient, the viscosity sensor on the side wall of the mixing tank calculates the weight based on the previous viscosity and the current viscosity, and sends the calculation back to the control system. The signal then re-acts on the weight sensor and the water outlet valve, repeating the above process to replenish the dispersant, ultimately accumulating the total amount of dispersant used. After the dispersant is prepared and transferred to the buffer tank, the DCS control panel resets to begin the next cycle.

[0015] The mixing tank is equipped with three sets of parallel filter bags at the discharge port to filter out some solid impurities in the solution and prevent foreign matter defects from being caused on the wood pulp layer.

[0016] The overflow plate is made of stainless steel, fixing the overflow port of the overflow tank and tilting downwards at a 45-degree angle, pointing towards the agitator inside the mixing tank. The overflow plate has a fan-shaped structure with an inner arc of 150mm, an outer arc of 250mm, and a length of 220mm, ensuring that the water flow directly impacts the agitator after passing through the overflow plate. Baffles are provided on both sides of the overflow plate to ensure that all the water flows to the agitator. A smooth, 40mm diameter ball is fixed 120mm directly above the center of the overflow plate. This ball is supported by baffles on both sides of the overflow plate (approximately a trapezoidal support). The dispersant outlet is 50mm directly above the center of the ball. When the dispersant is discharged, it falls onto the ball and slides outwards, entering the water flow directly below it. The ball can be made of smooth PVC material, allowing the dispersant to slide off its surface.

[0017] The beneficial effects of this utility model are: 1. This invention utilizes the combination of an overflow tank and an overflow plate to create a stable water flow, allowing the dispersant to be evenly incorporated. The dispersant is dispersed into the water flow, avoiding the randomness of manual dumping. The overall structure achieves preliminary uniform mixing of the dispersant and water, reducing the risk of clumping and ensuring a continuous and stable supply of the dispersant solution to the buffer tank. Compared to traditional manual feeding methods, this invention simplifies the operation process, reduces the impact of human intervention on the mixing effect, and helps improve production continuity and product molding stability.

[0018] 2. This invention uses a weight transmitter at the bottom of the hopper to monitor the dispersant feed rate in real time, dynamically adjusting the dosage based on the sizing amount, and automatically closing the discharge valve to prevent over- or under-dispensing. Compared to the subjective errors of manual weighing, this achieves precise control over the dispersant dosage, solving the problem of difficulty in matching the dispersant concentration when the sizing amount changes. It effectively prevents wood pulp fiber aggregation or dispersion failure, ensuring the dispersant solution concentration remains within the appropriate range, providing a stable foundation for uniform wood pulp layer formation.

[0019] 3. In this invention, a smooth ball between the hopper outlet and the overflow plate, combined with the overflow plate's flow-guiding design, allows the dispersant powder to be evenly dispersed and integrated into the water flow. Further agitation by a frame-type stirrer inside the mixing tank significantly reduces the probability of the dispersant clumping upon contact with water, improving dissolution efficiency and uniformity. Compared to the localized clumping problems caused by manual pouring, this structure ensures thorough mixing of the dispersant and water, preventing undissolved clumps from entering the production system and reducing defects such as waviness and cloudiness in the product from the source.

[0020] 4. In this invention, the entire process of water intake, material feeding, stirring, replenishment, and discharge is automated through the coordinated control of a level transmitter, viscosity sensor, valves, and agitator. This eliminates the need for real-time manual monitoring of weighing, viscosity, and dispersant replenishment, reducing tedious manual operations and preventing errors caused by human negligence. Furthermore, the automated process shortens the mixing cycle, adapts to continuous production needs, and significantly improves overall production efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the device for uniformly dispersing dispersant solution according to the present invention.

[0022] Figure 2 This is a schematic diagram of the overflow plate of this utility model.

[0023] Among them, 1. mixing tank; 2. hopper; 3. overflow tank; 4. water inlet pipe; 5. water inlet valve; 6. overflow plate; 7. overflow port; 8. discharge port; 9. discharge valve; 10. frame agitator; 11. viscosity sensor; 12. smooth ball; 13. weight transmitter; 14. support frame; 15. baffle. Detailed Implementation

[0024] 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.

[0025] Example 1 This embodiment provides a method such as Figures 1 to 2The apparatus shown for uniformly dispersing dispersant solution includes a mixing tank 1, a hopper 2, and an overflow tank 3. The overflow tank 3 is connected to a water inlet pipe 4, which is equipped with a water inlet valve 5. An overflow plate 6 is provided on one side of the overflow tank 3. One end of the overflow plate 6 is connected to the overflow port 7 of the overflow tank 3, and the other end of the overflow plate 6 extends obliquely downward into the mixing tank 1. The hopper 2 is located above the overflow plate 6, and the outlet 8 of the hopper 2 extends toward the overflow plate 6. The outlet 8 of the hopper 2 is equipped with a discharge valve 9. The outlet 8 of the mixing tank 1 is connected to a buffer tank.

[0026] In this embodiment, the water inlet valve 5 is a DN50 pneumatic valve; the discharge valve 9 is a solenoid valve VQZ212. In this embodiment, the buffer tank is not shown in the accompanying drawings. The buffer tank is a conventional technical means in the art, and even if the drawings are not provided, those skilled in the art can obtain it through common knowledge in the art.

[0027] In this embodiment, to ensure the stability of the formed wood pulp layer during continuous production, the amount of dispersant can be automatically weighed according to the amount of pulp applied. During dispersant preparation, water is slowly introduced into the overflow tank 3 through the water inlet pipe 4. When the tank is full, water flows out from the overflow port 7 and then flows along the overflow plate 6 towards the stirring position of the mixing tank 1. When the water level in the mixing tank 1 reaches the bottom, the discharge valve 9 below the hopper 2 containing the dispersant is controlled to discharge the powder. The dispersant powder falls into the water flow falling onto the overflow plate 6 and is then directed towards the mixing tank 1. During this process, the dispersant is evenly dispersed. This method avoids the need for manual weighing each time the dispersant is prepared, reduces unstable additions during manual preparation, and decreases labor intensity.

[0028] Example 2 In this embodiment, the overflow plate 6 is made of stainless steel. One end of the overflow plate 6 is fixed to the overflow port 7 of the overflow tank 3, and the other end of the overflow plate 6 extends horizontally downward at a 45-degree angle into the mixing tank 1. The overflow plate 6 has a fan-shaped structure with an inner arc of 150mm, an outer arc of 250mm, and a length of 220mm. Baffles 15 are provided on both sides of the overflow plate 6.

[0029] In this embodiment, the overflow plate 6 is made of stainless steel, which is corrosion-resistant and maintains a smooth surface to ensure smooth sliding of the dispersant. A 45-degree tilt angle balances the water flow rate and dispersant incorporation efficiency, preventing powder accumulation due to excessively slow water flow and avoiding excessively fast flow that could affect mixing. The fan-shaped structure expands the contact area between the water flow and the dispersant, while the side baffles 15 prevent water and powder from overflowing, ensuring that the material flows concentrated towards the mixing area of ​​the mixing tank 1. This creates a stable and uniform flow channel for the water flowing out of the overflow tank 3, allowing the dispersant powder to diffuse smoothly with the water flow, reducing clumping caused by excessively high local dispersant concentrations, improving the initial mixing uniformity of the dispersant and water, and ensuring the quality of subsequent mixing.

[0030] Example 3 In this embodiment, a smooth ball 12 for dispersing the dispersant is provided between the discharge port 8 of the hopper 2 and the overflow plate 6. The smooth ball 12 is located 120 mm above the middle position of the overflow plate 6, and the discharge port 8 of the hopper 2 is located 50 mm directly above the smooth ball 12. The smooth ball 12 is fixed above the overflow plate 6 by the baffles 15 on both sides of the overflow plate 6 and the support frame 14.

[0031] In this embodiment, when the water level in the mixing tank 1 reaches the bottom of the agitator, the valve below the hopper 2 containing the dispersant is controlled to dispense the powder. The powder falls onto the surface of a smooth, round sphere directly below the hopper 2 and slides down around the sphere. The smooth sphere 12 catches the dispersant powder falling from the hopper 2, allowing the powder to spread evenly and preventing it from accumulating. The powder flows smoothly towards the agitator with the water flow from the overflow plate 6, significantly reducing the probability of clumping, allowing the dispersant and water to mix quickly and thoroughly, improving dissolution efficiency, ensuring uniform concentration of the dispersant solution, and thus allowing the wood pulp fibers to be dispersed more evenly during molding.

[0032] Example 4 In this embodiment, a frame stirrer 10 is provided inside the mixing tank 1.

[0033] In this embodiment, the frame mixer 10 is a gear reducer CV-5; In this embodiment, after the dispersant is flushed into the mixing tank 1 by the water flow, the frame stirrer 10 is turned on to stir the liquid in the mixing tank 1, disperse and dissolve it, and prevent clumping.

[0034] Example 5 In this embodiment, a viscosity sensor 11 is installed inside the mixing tank 1.

[0035] In this embodiment, the viscosity sensor 11 is a HET-ND; In this embodiment, before the dispersant solution prepared in the mixing tank 1 is transferred to the buffer tank, the viscosity of the dispersant is detected by the viscosity sensor 11. If the viscosity does not meet the requirements, water and dispersant are added by controlling the valves to increase the concentration to the target level before it is put into the buffer tank for use.

[0036] Example 6 In this embodiment, a level transmitter is installed inside the mixing tank 1.

[0037] In this embodiment, the level transmitter is CYW11; In this embodiment, when the dispersant solution is being prepared, when the liquid level in the preparation tank 1 rises to the point of contacting the lower part of the frame agitator 10, the liquid level transmitter sends a signal to control the frame agitator 10 to start stirring. The discharge valve 9 of the hopper 2 is opened to start feeding dispersant powder until the water level reaches the set high level. Then, the water inlet valve 5 is closed to stop the preparation.

[0038] Example 7 In this embodiment, a weight transmitter 13 is provided at the lower part of the hopper 2.

[0039] In this embodiment, the weight transmitter 13 is an HBM with a range of 2kg; In this embodiment, the weight transmitter 13 monitors the weight of the added dispersant in real time, and closes the discharge valve 9 when the set value is reached. The amount of dispersant is automatically adjusted according to the sizing amount, avoiding errors from manual weighing and overdosing, ensuring stable solution concentration, reducing fiber aggregation or dispersion failure caused by improper dosage, improving product consistency, and reducing manual labor intensity.

[0040] Example 8 In this embodiment, the discharge port 8 of the mixing tank 1 is equipped with three sets of parallel filter bags.

[0041] In this embodiment, the dispersant solution is filtered through three sets of parallel filter bags to remove some solid impurities and avoid foreign object defects on the wood pulp layer.

[0042] In this embodiment, the use of three sets of parallel filter bags is a conventional technique in the art, and even without accompanying drawings, those skilled in the art can obtain it through common knowledge in the field.

[0043] In summary, in this utility model, those skilled in the art can also use a controller with a control panel to connect externally, based on common knowledge in the field. After setting the speed of the slurry pump on the control panel, the dispersion dosage can be controlled according to the slurry volume. When the water inlet valve 5 is opened, water flows into the overflow tank 3, and the liquid level in the overflow tank 3 gradually rises until water flows out from the overflow plate 6 and enters the mixing tank 1. When the liquid level in the mixing tank 1 rises to the point of contacting the lower part of the frame agitator 10, the liquid level transmitter in the mixing tank 1 sends a signal to control the agitator to run, the discharge valve 9 is opened, and at the same time, the weight transmitter 13 equipped at the lower part of the hopper 2 begins to measure. The dispersant falls smoothly onto the smooth ball 12 directly below. Due to the action of the smooth ball 12, the dispersant is dispersed around the ball and falls onto the overflow plate 6 through which water flows, and is carried by the water flow to the agitator position, where it is dispersed and dissolved by the agitator. After the amount of dispersant fed into hopper 2 reaches the set dispersant dosage, the discharge valve 9 is closed until the water level reaches the set high level, at which point the inlet valve 5 is closed. After stirring for 25 minutes, the mixture is allowed to stand for later use. When the liquid level in the buffer tank is low, the viscosity sensor 11 in mixing tank 1 detects the viscosity of mixing tank 1 (ensuring that the dispersant has not depolymerized). If the viscosity falls below the set level, the inlet valve 5 and the feed valve are reopened for replenishment. The amount of dispersant added at this time will be calculated based on the target viscosity and the detected viscosity, determining the amount of dispersant and the amount of water added. If the viscosity is suitable, no further dispersant is needed. Once the liquid level in the buffer tank reaches the low-low level, the discharge valve 9 of mixing tank 1 is controlled to allow free flow into the buffer tank. The bottom of discharge valve 9 has three sets of parallel filter bags to filter the solution, preventing foreign matter from the water or dispersant from entering the production system.

[0044] When the target wood pulp layer weight changes, and the speed of the pulping pump is adjusted, the amount of dispersant will be calculated based on the pulping volume, and the corresponding viscosity will be calculated based on the amount of dispersant, requiring reconfiguration of the dispersant. Finally, it should be noted that the control methods of the automatic batching device for dispersible products involved in this utility model are all conventional selections for chemical equipment and process control, and can be conventionally selected according to different chemical equipment, devices, and control instruments.

[0045] 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 apparatus for uniformly dispersing a dispersant solution, characterized in that: It includes a mixing tank (1), a hopper (2) and an overflow tank (3). The overflow tank (3) is connected to a water inlet pipe (4). The water inlet pipe (4) is equipped with a water inlet valve (5). An overflow plate (6) is provided on one side of the overflow tank (3). One end of the overflow plate (6) is connected to the overflow port (7) of the overflow tank (3). The other end of the overflow plate (6) extends obliquely downward into the mixing tank (1). The hopper (2) is located above the overflow plate (6). The outlet (8) of the hopper (2) extends toward the overflow plate (6). The outlet (8) of the hopper (2) is equipped with a discharge valve (9). The outlet (8) of the mixing tank (1) is connected to a buffer tank.

2. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: The overflow plate (6) is made of stainless steel. One end of the overflow plate (6) is fixed to the overflow port (7) of the overflow bucket (3). The other end of the overflow plate (6) extends horizontally downward at a 45-degree angle into the mixing bucket (1). The overflow plate (6) has a fan-shaped structure and baffles (15) are provided on both sides of the overflow plate (6).

3. The apparatus for uniformly dispersing the dispersant solution according to claim 2, characterized in that: Smooth small balls (12) for dispersing the dispersant are provided between the discharge port (8) of the hopper (2) and the overflow plate (6).

4. The apparatus for uniformly dispersing the dispersant solution according to claim 3, characterized in that: The smooth ball (12) is located above the middle position of the overflow plate (6). The outlet (8) of the hopper (2) is located directly above the smooth ball (12). The smooth ball (12) is fixed above the overflow plate (6) by the support frame (14) with the baffles (15) on both sides of the overflow plate (6) as support points.

5. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: The mixing tank (1) is equipped with a frame stirrer (10).

6. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: A viscosity sensor (11) is installed inside the mixing tank (1).

7. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: The mixing tank (1) is equipped with a liquid level transmitter.

8. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: The hopper (2) is equipped with a weight transmitter (13) at the bottom.

9. The apparatus for uniformly dispersing a dispersant solution according to claim 1, characterized in that: The mixing tank (1) has three sets of parallel filter bags at its discharge port (8).

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