A surface sizing hot water tank

Abstract

The utility model relates to papermaking equipment technical field discloses a kind of surface sizing hot water tank, including hot water tank, dilution subassembly and flushing subassembly;The bottom end of the inside of hot water tank is equipped with the inclined block of downward inclination, the inclined block is used to guide the flow direction of liquid, the top of hot water tank is equipped with feed inlet, water inlet and steam inlet from left to right;The feed inlet is communicated with work tank, the water inlet is communicated with clean water main, and the steam inlet is communicated with surface sizing steam pipe;One side of the hot water tank is equipped with hot water inlet, and the hot water inlet is respectively communicated with dilution subassembly and flushing subassembly.The utility model can solve the problem that the concentration adjustment precision of existing surface sizing hot water tank is insufficient and the response lags behind and cleaning is not complete.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, specifically to a hot water tank for surface sizing. Background Technology

[0002] The surface sizing hot water tank is a core piece of equipment in the papermaking surface sizing process, mainly used for starch gelatinization, heat preservation and storage, and stable delivery of sizing liquid.

[0003] The existing hot water tanks have the following drawbacks in practical applications: (1) Insufficient accuracy in concentration adjustment and delayed response. The existing glue concentration adjustment mostly adopts the "external preparation - batch injection" mode, that is, the glue solution of the target concentration is prepared in an independent container and then transported to the hot water tank through pipeline. This method not only has the problem that the concentration is easily affected by environmental factors (such as temperature and stirring uniformity) during the preparation process, but also the concentration adjustment cannot respond to the concentration fluctuation in the hot water tank in real time due to the delay in the transportation link, which often causes the glue concentration deviation to exceed ±5%, directly affecting the performance stability of the paper after sizing. (2) The equipment flushing and maintenance efficiency is low and the cleaning is incomplete. The adhesive has a certain viscosity and is easy to remain on the inner walls of the tank, stirring parts and pipelines after preparation. If the cleaning is not thorough, the residual adhesive will deteriorate in the next production and contaminate the new adhesive. The existing equipment flushing system mostly adopts single-pipe direct flushing, which has a large number of cleaning dead corners (such as the corners of the tank and the connection between the stirring shaft and the tank); and the flushing water and dilution water share the same pipeline, without a graded filtration device. Impurities in the water are easy to adhere to the inner wall of the equipment during the flushing process, further affecting the cleaning effect. Statistical data shows that the single flushing time of traditional equipment is as long as 1-2 hours, and there is still a risk of more than 30% residue. Utility Model Content

[0004] The present invention aims to provide a surface adhesive hot water bath to solve the problems of insufficient concentration adjustment accuracy, slow response, and incomplete cleaning in existing surface adhesive hot water baths.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a surface sizing hot water tank, comprising a hot water tank, a dilution component, and a rinsing component; the bottom of the hot water tank is provided with a downwardly inclined block, which is used to guide the flow of liquid; the top of the hot water tank is provided with a feed inlet, a water inlet, and a steam inlet from left to right; the feed inlet is connected to the working tank, the water inlet is connected to the main clean water pipe, and the steam inlet is connected to the surface sizing steam pipe; a hot water inlet is provided on one side of the hot water tank, which is connected to the dilution component and the rinsing component respectively.

[0006] The principle of this solution is as follows: The steam inlet is opened, allowing steam from the surface sizing steam pipe to enter the hot water tank. Then, the feed inlet is opened, and the starch suspension in the working tank begins to flow into the hot water tank. Once inside, the starch suspension rapidly diffuses, making full contact with the steam and hot water. When starch gelatinization is largely complete and the adhesive concentration needs adjustment, the dilution unit is activated according to the pre-set concentration requirements, slowly injecting hot water into the hot water tank through the hot water inlet. Simultaneously, the adhesive is continuously stirred to ensure thorough mixing between the hot water and the adhesive. When rinsing or maintenance of the hot water tank is required, the feed inlet, water inlet, and steam inlet are closed to isolate the tank from the outside environment. The rinsing unit is then activated, delivering hot water through the hot water inlet into the hot water tank for rinsing.

[0007] The advantages of this solution are: (1) The inclined block is used to guide the flow of liquid.

[0008] (2) The dilution component can adjust the concentration of starch solution in the hot water tank in real time and accurately according to actual production needs, ensuring that the concentration of glue solution meets the requirements of paper sizing process, and improving the flexibility and accuracy of glue solution preparation.

[0009] (3) The washing component enables the equipment to be washed quickly and efficiently after use, thereby extending the service life of the equipment, reducing equipment maintenance costs, and ensuring that the next preparation of adhesive is not affected by impurities, thus improving product quality.

[0010] Preferably, as an improvement, the tilt angle of the tilting block is 5°-10°.

[0011] Beneficial effects: The tilt angle of the inclined block can guide the liquid (such as hot water, adhesive, etc.) in the hot water tank to flow to the lower side, which facilitates the centralized collection, discharge or guidance of the liquid to a specific area (such as the hot water inlet), thereby improving the flow efficiency of the liquid in the hot water tank, reducing liquid residue, and also optimizing the use of the space in the tank to a certain extent.

[0012] Preferably, as an improvement, the hot water tank is equipped with a liquid level sensor and a stirrer; the stirrer is suspended inside the hot water tank by a cable, the liquid level sensor is used to monitor the liquid level height in the hot water tank in real time, and the stirrer is used to stir and mix the starch suspension, hot water and adhesive liquid in the hot water tank.

[0013] Beneficial effects: By incorporating a level sensor and a stirrer, the liquid level in the hot water tank can be monitored in real time. Stirring with the stirrer breaks up liquid stratification, ensuring sufficient contact between the starch and hot water / steam, thus improving gelatinization uniformity. Simultaneously, during the dilution of the adhesive, it accelerates the fusion of hot water and the adhesive, ensuring consistent concentration and preventing localized areas of excessively high or low concentration.

[0014] Preferably, as an improvement, the dilution component includes a dilution hot water pump and a first filter, and the hot water inlet is connected to a first hot water pipe in sequence through the dilution hot water pump and the first filter, for the purpose of in-situ adjustment of the concentration of the adhesive in the hot water tank.

[0015] Beneficial effects: The first filter effectively removes impurities, particles, or scale from the hot water, preventing contaminants from entering the hot water tank and causing blockages. The dilution hot water pump provides stable and controllable water flow, ensuring that hot water is quickly injected into the adhesive solution at appropriate pressure and flow rate, achieving efficient mixing, shortening the time required for concentration adjustment, and supporting dynamic adjustment needs during the production process.

[0016] Preferably, as an improvement, the flushing assembly includes a flushing hot water pump and a second filter, and the hot water inlet is connected to a second hot water pipe in sequence through the flushing hot water pump and the second filter for flushing the inside of the hot water tank.

[0017] Beneficial effects: The second filter effectively removes impurities, particles, or scale from the hot water, preventing contaminants from entering the hot water tank and causing blockages. The flushing hot water pump provides stable and controllable water pressure and flow, enabling rapid and powerful flushing and significantly improving cleaning efficiency.

[0018] Preferably, as an improvement, the hot water tank further includes a first overflow port and a second overflow port, the second overflow port being located below the hot water inlet, and the first overflow port being located on the side away from the hot water inlet and close to the top of the hot water tank.

[0019] Beneficial effects: The first overflow port, located near the top of the tank, can promptly drain excess liquid when the liquid level rises abnormally, effectively preventing overflow of the hot water tank due to excessive water intake and ensuring safe equipment operation. The second overflow port, located below the hot water inlet, serves as an auxiliary overflow and balancing port, quickly responding to local liquid level fluctuations and improving the stability of liquid level control. It also guides some water flow to be discharged nearby, mitigating the impact of incoming water, reducing bubble formation, and preventing bubbles from affecting the quality of the adhesive or the precision of subsequent processes.

[0020] Preferably, as an improvement, the bottom of the hot water tank is provided with a discharge port, which is connected to the adhesive application equipment.

[0021] Beneficial effects: The bottom discharge design facilitates a downward liquid level trend, ensuring that the adhesive is fully discharged under gravity and pressure, minimizing residue in the tank, avoiding material waste, and ensuring thoroughness when replacing or cleaning the adhesive.

[0022] Preferably, as an improvement, the steam pressure is 5 kPa.

[0023] Preferably, as an improvement, the volume of the hot water tank is 10. The temperature inside the hot water tank is 50°C-70°C.

[0024] Beneficial effects: The volume of the hot water tank is 10. This volume design can meet the needs of a certain scale of paper production, ensuring a continuous supply of adhesive solution. The temperature inside the hot water tank is 50°C-70°C, which is suitable for starch gelatinization and adhesive solution preparation, ensuring the stability of the adhesive solution's quality and performance.

[0025] In summary, the beneficial effects of this solution are as follows: (1) This solution integrates the dilution component and the rinsing component, and adapts them to the structural design of the hot water tank, forming an integrated system of "in-situ concentration adjustment - efficient rinsing and maintenance". Among them, the dilution component realizes in-situ concentration adjustment by directly injecting hot water into the tank through the series design of the first filter and the hot water inlet, avoiding the lag of external adjustment; the rinsing component adopts an independent second filter and a pipeline design that can be directionally rinsed, which solves the problem of cleaning dead corners in traditional equipment.

[0026] (2) This solution can correct the concentration deviation of the adhesive in real time through the in-situ concentration adjustment function of the dilution component, and ensure that the concentration fluctuation range is controlled within the range required by the process (based on actual process verification data). Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a surface-applied hot water tank provided in an embodiment of the present utility model.

[0028] Figure 2 This is a schematic diagram of the structure of a hot water tank in a surface-applied hot water tank provided in an embodiment of the present utility model.

[0029] The reference numerals in the accompanying drawings include: hot water tank 1, feed inlet 2, water inlet 3, steam inlet 4, discharge outlet 5, hot water inlet 6, first overflow outlet 7, second overflow outlet 8, liquid level sensor 9, stirrer 10, dilution hot water pump 11, flushing hot water pump 12, first filter 13, and second filter 14. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figure 1 and Figure 2 As shown: A surface adhesive hot water tank includes a hot water tank, a dilution component, and a rinsing component.

[0031] The bottom of the hot water tank 1 is equipped with a downward-sloping block with an inclination angle of 5°-10°. This angle range ensures that the liquid in the hot water tank (such as residual adhesive or rinsing wastewater) flows smoothly to the lower position under its own weight, avoiding liquid accumulation, while also preventing excessive reduction in the effective volume of the tank due to an excessively large angle. This balances liquid flow efficiency and tank space utilization. The inclined block guides the liquid in the hot water tank 1 (such as hot water, adhesive, or rinsing wastewater) to the lower side, facilitating centralized collection, discharge, or guidance of the liquid to specific areas (such as hot water inlets or overflow outlets). This improves the liquid flow efficiency in the hot water tank 1, reduces liquid accumulation, and also optimizes the utilization of the tank space to some extent.

[0032] The top of the hot water tank 1 is equipped with a feed inlet 2, a water inlet 3, and a steam inlet 4 from left to right. The feed inlet 2 is connected to the working tank, through which the starch suspension in the working tank is transported to the hot water tank 1 to provide raw materials for the preparation of the adhesive solution. The water inlet 3 is connected to the main clean water pipe and is used to replenish clean water into the hot water tank 1 to adjust and regulate the temperature inside the tank. The steam inlet 4 is connected to the surface sizing steam pipe, introducing steam to heat the materials in the hot water tank 1 to meet the temperature requirements during the preparation of the adhesive solution.

[0033] The bottom of the hot water tank 1 is equipped with a discharge port 5, which is connected to the subsequent sizing equipment (such as the feeding system of the sizing machine). The prepared finished glue liquid is output through the discharge port 5 and enters the subsequent sizing operation to achieve surface sizing of the paper.

[0034] Hot water tank 1 is equipped with a hot water inlet 6, a first overflow port 7, and a second overflow port 8 on both sides. The hot water inlet 6 and the second overflow port 8 are located on the right side of the hot water tank 1, with the second overflow port 8 located below the hot water inlet 6. The first overflow port 7 is located on the left side of the hot water tank 1, near the top. The hot water inlet 6 is connected to both the dilution assembly and the rinsing assembly, providing a hot water source for the dilution and rinsing operations. When the liquid level in the hot water tank 1 is too high, excess liquid can be discharged through the first overflow port 7 or the second overflow port 8 to maintain a stable liquid level in the tank.

[0035] Specifically, the dilution assembly includes a dilution hot water pump 11 and a first filter 13. The hot water inlet 6 is connected to the first hot water pipe via the dilution hot water pump 11 and the first filter 13. During the preparation of the adhesive solution, when it is necessary to adjust the concentration of the adhesive solution in the tank, the dilution hot water pump 11 is activated to draw hot water from the first hot water pipe. The hot water is then filtered through the first filter 13 to remove impurities, and then injected into the hot water tank 1 through the hot water inlet 6 to mix with the adhesive solution in the tank, thus achieving in-situ adjustment of the adhesive solution concentration. The first filter 13 effectively prevents impurities from entering the hot water tank 1 and affecting the quality of the adhesive solution.

[0036] The rinsing assembly includes a rinsing hot water pump 12 and a second filter 14. A hot water inlet 6 is connected to a second hot water pipe via the rinsing hot water pump 12 and the second filter 14. During the equipment cleaning phase, the rinsing hot water pump 12 is activated, drawing hot water from the second hot water pipe. After being filtered by the second filter 14, the hot water is delivered to the hot water tank 1 through the hot water inlet 6 to rinse the inside of the tank. The second filter 14 ensures the cleanliness of the rinsing water, improves the rinsing effect, effectively removes residual adhesive and other impurities from the hot water tank 1, ensures the cleanliness of the equipment for the next use, and avoids the impact of impurities on the quality of newly prepared adhesive.

[0037] A liquid level sensor 9 and a stirrer 10 are installed inside the hot water tank 1. The stirrer 10 is suspended inside the hot water tank 1 by a cable. The liquid level sensor and stirrer allow for real-time monitoring of the liquid level in the hot water tank 1. When the liquid level reaches the set upper limit, the valves at the feed inlet 2 or water inlet 3 can be closed to prevent liquid overflow. When the liquid level falls below the set lower limit, it prompts the addition of materials or clean water to ensure continuous and stable preparation of the adhesive solution. The stirrer breaks up liquid stratification, ensuring sufficient contact between starch and hot water / steam, improving gelatinization uniformity. Simultaneously, during adhesive solution dilution, it accelerates the fusion of hot water and adhesive solution, ensuring consistent concentration and preventing localized excessively high or low concentrations.

[0038] In this embodiment, the volume of the hot water tank 1 is 10. This volume design can meet the needs of a certain scale of paper production and ensure a continuous supply of adhesive solution. The temperature in the hot water tank 1 is 50°C-70°C, which is suitable for starch gelatinization and adhesive solution preparation, ensuring the quality and performance stability of the adhesive solution.

[0039] Specific implementation process: To prepare a starch slurry of the specified concentration: First, open the valve at steam inlet 4 to allow steam from the surface sizing steam pipe to enter the hot water tank 1. When the temperature in the hot water tank 1 reaches 70°C and the steam pressure is 5 kPa, open the valve at feed inlet 2. The starch suspension in the working tank will then begin to be conveyed into the hot water tank 1. During the conveying process, it is important to control the feeding speed to avoid excessively fast feeding, which could cause the liquid level in the tank to rise too high instantaneously or result in uneven mixing of the materials. After the starch suspension enters the hot water tank 1, it diffuses rapidly within the tank, making full contact with the steam and hot water.

[0040] During the starch gelatinization process, the temperature change in the hot water tank 1 is monitored in real time using a thermometer. If the temperature is lower than the lower limit of the set range (50°C), the steam flow rate at the steam inlet 4 is increased appropriately to improve the heating rate; if the temperature is higher than the upper limit of the set range (70°C), the steam flow rate at the steam inlet 4 is reduced, or clean water is introduced appropriately through the hot water inlet 6 to adjust the temperature in the tank.

[0041] When starch gelatinization is basically complete and the glue concentration needs to be adjusted, the dilution hot water pump 11 is started according to the preset glue concentration requirements. The dilution hot water pump 11 draws hot water from the first hot water pipe, filters it through the first filter 13, and then slowly injects it into the hot water tank 1 through the hot water inlet 6. At the same time, the glue is continuously stirred to ensure that the hot water and glue are fully mixed. During the hot water injection process, the glue concentration is monitored in real time by an online concentration detector (which can be installed near the outlet 5 or other suitable locations). When the glue concentration reaches the specified value, the operation of the dilution hot water pump 11 is stopped.

[0042] After a batch of adhesive solution is prepared and output, the hot water tank 1 needs to be rinsed and maintained to ensure the cleanliness of the equipment for the next use. First, close the inlet 2, outlet 5, steam inlet 4, and all valves connecting to other equipment to isolate the hot water tank 1 from the outside environment. Turn on the rinsing hot water pump 12; hot water is output from the second hot water pipe, filtered by the second filter 14, and then delivered to the hot water tank 1 through the hot water inlet 6. The flow rate and pressure of the rinsing hot water can be adjusted according to the actual situation, generally maintaining a relatively high flow rate and appropriate pressure to ensure the rinsing effect. After rinsing for a certain period, open the first overflow port 7 and the second overflow port 8 of the hot water tank 1 to discharge the rinsed wastewater. Observe the discharged wastewater; when the wastewater is clear and free of obvious impurities, the rinsing is considered basically complete. Then close the rinsing hot water pump 12 and the overflow valves to complete the equipment rinsing and maintenance operation.

[0043] Compared to existing technologies, this invention is inventive: (1) In the prior art, surface sizing hot water tanks are mostly independent equipment with only a single function of hot water storage or preliminary mixing. When adjusting the concentration of the adhesive, the adhesive in the hot water tank needs to be exported to an external container, mixed with hot water, and then pumped back, which has the problems of complicated operation process and delayed concentration adjustment. When cleaning the equipment, manual rinsing or simple pipeline spraying is often used, which easily leads to cleaning dead corners such as the bottom of the tank and corners. The residual adhesive will affect the quality of the subsequent adhesive after drying. Moreover, the dilution water and rinsing water are not filtered separately, and impurities can easily enter the hot water tank, resulting in a decrease in the purity of the adhesive and thus affecting the paper sizing effect. (2) This solution integrates the dilution component and the rinsing component and is deeply adapted to the structural design of the hot water tank 1 to form an integrated system of "in-situ concentration adjustment - efficient rinsing and maintenance". Among them, the dilution component realizes the in-situ concentration adjustment of hot water directly injected into the tank through the series design of the first filter and the hot water inlet, avoiding the lag of external mixing; the rinsing component adopts an independent second filter and a pipeline design that can be directionally rinsed, which solves the problem of cleaning dead corners of traditional equipment.

[0044] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A hot water tank with surface adhesive application, characterized in that: It includes a hot water tank, a dilution component, and a rinsing component; the bottom of the hot water tank is provided with a downward-sloping block, which is used to guide the flow of liquid; the top of the hot water tank is provided with a feed inlet, a water inlet, and a steam inlet from left to right; the feed inlet is connected to the working tank, the water inlet is connected to the main clean water pipe, and the steam inlet is connected to the surface coating steam pipe; a hot water inlet is provided on one side of the hot water tank, which is connected to the dilution component and the rinsing component respectively.

2. The surface adhesive application hot water tank according to claim 1, characterized in that: The tilt angle of the tilt block is 5°-10°.

3. A surface-applied hot water tank according to claim 1, characterized in that: The hot water tank is equipped with a liquid level sensor and a stirrer. The stirrer is suspended inside the hot water tank by a cable. The liquid level sensor is used to monitor the liquid level in the hot water tank in real time. The stirrer is used to stir and mix the starch suspension, hot water and adhesive in the hot water tank.

4. A surface-applied hot water tank according to claim 1, characterized in that: The dilution assembly includes a dilution hot water pump and a first filter. The hot water inlet is connected to the first hot water pipe in sequence through the dilution hot water pump and the first filter, which is used to achieve in-situ adjustment of the concentration of the adhesive in the hot water tank.

5. A surface-applied hot water tank according to claim 1, characterized in that: The flushing assembly includes a flushing hot water pump and a second filter. The hot water inlet is connected to the second hot water pipe in sequence through the flushing hot water pump and the second filter, and is used to flush the inside of the hot water tank.

6. A surface-applied hot water tank according to claim 1, characterized in that: The hot water tank also includes a first overflow port and a second overflow port. The second overflow port is located below the hot water inlet, and the first overflow port is located on the side away from the hot water inlet and near the top of the hot water tank.

7. A surface-applied hot water tank according to claim 1, characterized in that: The bottom of the hot water tank is provided with a discharge port, which is connected to the adhesive application equipment.

8. A hot water tank for surface adhesive application according to claim 1, characterized in that: The steam pressure is 5 kPa.

9. A surface-applied hot water tank according to claim 1, characterized in that: The volume of the hot water tank is 10. The temperature inside the hot water tank is 50°C-70°C.

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