A paper machine surface sizing system

Abstract

The utility model relates to a kind of paper machine surface sizing system, including working tank, working tank is used to accommodate sizing material;Filtering mechanism, filtering mechanism is connected with working tank by pipeline;Feeding pump, feeding pump is set on the pipeline between filtering mechanism and working tank;Sizing machine, sizing machine is connected with filtering mechanism by pipeline, sizing machine is used to evenly apply sizing material on paper surface;Return hopper, return hopper is set below sizing roll of sizing machine, return hopper is used to recycle redundant sizing material in sizing process;Vibrating screen, vibrating screen is connected with return hopper by pipeline;Conveying pump, conveying pump is set on the pipeline between vibrating screen and return hopper;Recovery tank, recovery tank is connected with vibrating screen by pipeline;Sand remover, the inlet of sand remover is connected with recovery tank by pipeline, the good pulp outlet of sand remover is connected with working tank by pipeline;And inlet pump, inlet pump is set on the pipeline between recovery tank and sand remover.

Description

Technical Field

[0001] This utility model relates to the technical field of paper sizing systems, and specifically to a paper machine surface sizing system. Background Technology

[0002] Currently, due to environmental protection requirements, waste paper undergoes multiple recycling processes, resulting in increased residues of impurities (such as ink, adhesives, fillers, etc.), a rise in the proportion of low-quality waste paper, and an increase in the degree of closed-loop circulation in the white water system. All of these factors contribute to the accumulation of adhesives and impurities within the system, further exacerbating the residue of impurities in the raw paper.

[0003] During the surface sizing process, impurities such as ink, adhesives, and fillers in waste paper enter the sizing system along with the pulp. After mixing with synthetic adhesives (such as sizing agents), they form a complex adhesive system. These adhesives tend to aggregate during the sizing process, leading to increased viscosity and decreased flowability of the adhesive, which in turn contaminates the sizing system.

[0004] The quality of waste paper raw materials is deteriorating, and the adhesive in the surface sizing system is becoming increasingly contaminated. High levels of impurities in the adhesive can clog the scraper and sealing blade, leading to wear and tear on the sizing roller and scraper. Poor adhesive cleanliness results in poor film formation, producing particle streaks and negatively impacting product quality. Utility Model Content

[0005] Therefore, a paper machine surface sizing system is needed to address the technical problems of increasingly poor quality waste paper raw materials, increasingly contaminated sizing agents in surface sizing systems, high levels of impurities that clog the doctor blade and sealing knife, leading to wear on the sizing roller and doctor blade, poor sizing agent cleanliness, poor film formation, particle streaks, and negatively impacting product quality.

[0006] To achieve the above objectives, the inventors provide a paper machine surface sizing system, comprising:

[0007] Working tank, the working tank being used to hold the adhesive material;

[0008] A filtration mechanism, which is connected to the working tank via a pipeline;

[0009] A feeding pump is installed on the pipeline between the filtration mechanism and the working tank;

[0010] A sizing machine, which is connected to the filtering mechanism via a pipeline, is used to evenly apply adhesive to the surface of paper.

[0011] A return hopper is provided below the glue application roller of the glue applicator, and the return hopper is used to recover excess glue material during the glue application process;

[0012] A vibrating screen, wherein the vibrating screen is connected to the return hopper via a pipeline;

[0013] A conveying pump is installed on the pipeline between the vibrating screen and the return hopper;

[0014] A recycling tank, which is connected to the vibrating screen via a pipeline;

[0015] A sand separator, wherein the inlet of the sand separator is connected to the recovery tank via a pipeline, and the good slurry outlet of the sand separator is connected to the working tank via a pipeline;

[0016] And a slurry pump, which is installed on the pipeline between the recovery tank and the desander.

[0017] As a preferred structure of this utility model, the paper machine surface sizing system further includes a settling tank, which is connected to the tail pulp outlet of the desander via a pipeline.

[0018] In a preferred embodiment of this invention, the sedimentation tank and the recovery tank are connected by a pipeline.

[0019] As a preferred structure of this utility model, the paper machine surface sizing system further includes a control mechanism, a pressure detection mechanism, a first control switch, and a pressure relief pipeline;

[0020] The pressure detection mechanism is located at the good slurry outlet of the desander. The pressure detection mechanism is electrically connected to the control mechanism and is used to detect the pressure of the slurry discharged from the rubber compound.

[0021] One end of the pressure relief pipeline is connected to the recovery tank, and the other end of the pressure relief pipeline is connected to the pipeline between the sand remover and the working tank;

[0022] The first control switch is located on the pressure relief pipeline and is electrically connected to the control mechanism;

[0023] The control mechanism is used to receive and process the detection signal from the pressure detection mechanism, and to control the opening or closing of the first control switch.

[0024] As a preferred structure of this utility model, the paper machine surface sizing system further includes a bypass pipeline, a second control switch and a third control switch;

[0025] One end of the bypass pipe is connected to the pipe between the filter mechanism and the glue applicator, and the other end of the bypass pipe is connected to the working tank;

[0026] The second control switch is located on the pipeline between the filtration mechanism and the adhesive applicator;

[0027] The third control switch is located on the bypass pipeline.

[0028] As a preferred embodiment of this invention, the paper machine surface sizing system further includes a connecting pipe, a fourth control switch, and a fifth control switch.

[0029] One end of the connecting pipe is connected to the pipe between the vibrating screen and the recycling tank, and the other end of the connecting pipe is connected to the bypass pipe.

[0030] The fourth control switch is installed on the pipeline between the vibrating screen and the recycling tank;

[0031] The fifth control switch is located on the connecting pipeline.

[0032] As a preferred structure of this utility model, the paper machine surface sizing system further includes a first slag trough and a sixth control switch. The first slag trough is connected to the vibrating screen through a pipeline, and the sixth control switch is located on the pipeline between the first slag trough and the vibrating screen.

[0033] As a preferred structure of this utility model, the paper machine surface sizing system further includes a second slag trough and a seventh control switch. The second slag trough is connected to the sedimentation tank through a pipeline, and the seventh control switch is located on the pipeline between the second slag trough and the sedimentation tank.

[0034] As a preferred structure of this utility model, the filtration mechanism is a filter.

[0035] As a preferred structure of this utility model, the pressure detection mechanism is a pressure sensor.

[0036] Unlike existing technologies, the above technical solution offers the following advantages: Multi-stage purification, improving the cleanliness of the adhesive: Through a three-stage purification process—"filtration mechanism (primary filtration) → vibrating screen (secondary filtration) → sand remover (deep filtration)"—large particulate impurities, fine adhesive substances, and high-density hard impurities are removed sequentially, effectively solving the problem of adhesive contamination and reducing particle streaks in the adhesive film formation. Protecting equipment and reducing wear: Removing hard impurities and adhesive substances from the adhesive reduces clogging of the scraper and sealing knife, as well as wear on the application roller, extending equipment lifespan and reducing maintenance costs.

[0037] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0038] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0039] In the accompanying drawings of the instruction manual:

[0040] Figure 1 This is a schematic diagram of the paper machine surface sizing system described in a specific embodiment;

[0041] Figure 2 This is a circuit connection diagram of the paper machine surface sizing system described in a specific embodiment.

[0042] The reference numerals used in the above figures are explained as follows:

[0043] 1. Working slot,

[0044] 2. Filtration mechanism,

[0045] 3. Feed pump,

[0046] 4. Glue applicator

[0047] 5. Return hopper,

[0048] 6. Vibrating screen,

[0049] 7. Transfer pump,

[0050] 8. Recycling tank,

[0051] 9. Sand separator,

[0052] 10. Slurry pump,

[0053] 11. Sedimentation tank

[0054] 12. Control mechanism,

[0055] 13. Pressure testing agency,

[0056] 14. First control switch,

[0057] 15. Pressure relief pipeline,

[0058] 16. Bypass pipe,

[0059] 17. Second control switch,

[0060] 18. Third control switch

[0061] 19. Connecting pipes,

[0062] 20. Fourth control switch,

[0063] 21. Fifth control switch,

[0064] 22. First slag tank,

[0065] 23. Sixth control switch,

[0066] 24. Second slag tank,

[0067] 25. Seventh control switch. Detailed Implementation

[0068] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0069] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0070] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0071] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0072] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0073] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0074] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0075] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. These expressions are only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, in this context, it should be understood that when it is mentioned that an element is connected "on" or "below" another element, it can be directly connected not only to the other element "on" or "below," but also indirectly connected to the other element "on" or "below" through an intermediate element.

[0076] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0077] Please see Figure 1 and Figure 2 This embodiment relates to a paper machine surface sizing system, comprising:

[0078] The working tank 1 is used to hold the adhesive material; the working tank 1 is a container for storing and temporarily storing the adhesive material to be applied. The working tank 1 is made of stainless steel. The working tank 1 serves as the starting point for adhesive material circulation and is connected to the filter mechanism 2 through pipelines to provide a stable source of adhesive material for the applicator 4; ensuring a stable storage environment for the adhesive material.

[0079] A filtration mechanism 2 is connected to the working tank 1 via a pipeline; the filtration mechanism 2 is a device for initial impurity filtration of the adhesive material. The filtration mechanism 2 intercepts larger and smaller particulate impurities (such as clumps and crusts). In this embodiment, the filtration mechanism 2 is a filter with a built-in filter screen. When the adhesive material, supplied by the feed pump 3, flows through the filter screen, it intercepts large particulate impurities (such as lumpy adhesives and coarse fibers). One end of the filtration mechanism 2 is connected to the working tank 1 via a pipeline, and the other end is connected to the applicator 4, achieving preliminary purification of the adhesive material. By providing the filtration mechanism 2, large particulate impurities visible to the naked eye are removed from the adhesive material, preventing them from directly entering the applicator 4 and scratching the applicator rollers or clogging the scraper, thus reducing the pressure on subsequent purification.

[0080] A feed pump 3 is installed on the pipeline between the filter mechanism 2 and the working tank 1. The feed pump 3 provides power for conveying the adhesive from the working tank 1 to the applicator 4. The feed pump 3 is a corrosion-resistant centrifugal pump or screw pump, installed on the pipeline between the working tank 1 and the filter mechanism 2. It presses the adhesive into the filter mechanism 2 and the applicator 4 through a stable head and flow rate, ensuring filtration efficiency. By providing stable adhesive conveying power through the feed pump 3, continuous material supply to the filter mechanism 2 and the applicator 4 is guaranteed, avoiding insufficient filtration or uneven application due to pressure fluctuations.

[0081] A sizing machine 4 is connected to the filtering mechanism 2 via a pipeline. The sizing machine 4 is used to uniformly apply adhesive to the surface of paper. The sizing machine 4 is a device for uniformly applying purified adhesive to the paper surface. The sizing machine 4 includes at least one pair of sizing rollers (such as a rubber roller and a chrome-plated roller). After filtration, the adhesive enters the gap between the sizing rollers, and is transferred to the paper surface through roller surface contact, completing the sizing process. The sizing machine 4 is connected to the filtering mechanism 2 via a pipeline, ensuring that the purified adhesive is directly used for sizing. Utilizing purified adhesive for sizing reduces wear on the sizing rollers caused by impurities, ensures uniform adhesive film formation, and improves the smoothness and strength of the paper surface.

[0082] A return hopper 5 is located below the glue applicator roller of the glue applicator 4. The return hopper 5 is used to collect excess glue material during the glue application process; specifically, it is a device for collecting excess glue material that has not been transferred to the paper surface during the glue application process. The return hopper 5 is funnel-shaped, with its opening corresponding to the contact area of ​​the glue applicator roller, and collects glue material that drips or overflows during glue application. It is connected to the vibrating screen 6 via a pipeline. By providing the return hopper 5, excess glue material is recycled and reused, reducing raw material waste; at the same time, it avoids environmental pollution caused by direct discharge of excess glue, meeting environmental protection requirements.

[0083] A vibrating screen 6 is connected to the return hopper 5 via a pipeline; the vibrating screen 6 is a vibrating filter device for secondary screening and impurity removal of the recovered residual rubber. The vibrating screen 6 uses a high-frequency vibrating screen (pore size 100-200 mesh). The residual rubber in the return hopper 5 is pumped onto the screen surface by a conveying pump 7. Vibration causes fine particulate impurities (such as dispersed adhesives and filler particles) in the rubber to be intercepted by the screen, and the purified rubber flows into the recovery tank 8. This secondary purification of the recovered residual rubber prevents its accumulation with the rubber circulation, further improving the cleanliness of the rubber.

[0084] A conveying pump 7 is installed on the pipeline between the vibrating screen 6 and the return hopper 5. The conveying pump 7 provides power for transporting residual adhesive from the return hopper 5 to the vibrating screen 6. Similar to the feeding pump 3, the conveying pump 7 is a corrosion-resistant pump, installed on the pipeline between the return hopper 5 and the vibrating screen 6 to ensure efficient delivery of residual adhesive to the vibrating screen 6, preventing residual adhesive from stagnating and solidifying in the return hopper 5. This ensures the continuity of residual adhesive recovery, prevents blockage of the return hopper 5, and maintains the stability of the system circulation.

[0085] A recovery tank 8 is connected to the vibrating screen 6 via a pipeline. The recovery tank 8 serves as a container for temporarily storing residual adhesive after purification by the vibrating screen 6. It is connected to a sand separator 9 via a pipeline, providing temporary storage space for the deep purification process. The recovery tank 8 buffers the flow rate of adhesive between the vibrating screen 6 and the sand separator 9, ensuring a stable amount of adhesive entering the sand separator 9 and improving the efficiency of deep purification.

[0086] A desander 9 is included, with its inlet connected to the recovery tank 8 via a pipeline, and its good slurry outlet connected to the working tank 1 via a pipeline. The desander 9 utilizes centrifugal force to separate high-density impurities from the adhesive. The inlet is connected to the recovery tank 8 via a pipeline and contains a conical separation chamber. Under the action of the feed pump 10, the adhesive rotates at high speed, and high-density impurities are deposited at the bottom of the chamber (tail slurry outlet) due to centrifugal force. The purified good slurry is discharged from the top good slurry outlet and returned to the working tank 1 for continued use. The desander 9 removes high-density, hard impurities from the adhesive that could scratch the equipment, preventing them from circulating back to the applicator 4 and causing wear on the applicator rollers, while further reducing the impurity content in the adhesive.

[0087] The system includes a feed pump 10, which is installed on the pipeline between the recovery tank 8 and the desander 9. The feed pump 10 provides the power for conveying the rubber material from the recovery tank 8 to the desander 9. The desander 9 is a high-lift centrifugal pump, installed on the pipeline between the recovery tank 8 and the desander 9, providing sufficient inlet pressure to ensure effective centrifugal separation. The feed pump 10 ensures the separation efficiency of the desander 9, ensuring that high-density impurities are effectively separated and improving the cleanliness of the pulp.

[0088] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system also includes a settling tank, which is connected to the tail slurry outlet of the desander 9 via a pipeline. The settling tank is used to settle the tail slurry discharged from the desander 9. The tail slurry (containing high-concentration impurities) is placed in the tank, allowing some suspended impurities in the sizing material to settle. The supernatant can be returned to the recovery tank 8 for further purification via a pipeline, reducing the waste of sizing material caused by direct discharge of tail slurry. The sedimentation and recovery of some sizing material allows for reuse, while also reducing the amount of waste slurry and saving costs.

[0089] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the sedimentation tank and the recovery tank 8 are connected by pipelines. The tailings slurry is left to stand in the tank, where some suspended impurities in the adhesive settle. The supernatant can be returned to the recovery tank 8 for further purification via pipelines, reducing the waste of adhesive caused by direct discharge of tailings slurry. Sedimentation and recovery of some adhesive allows for reuse, while also reducing the amount of waste slurry to be treated and saving costs.

[0090] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system further includes a control mechanism 12, a pressure detection mechanism 13, a first control switch 14, and a pressure relief pipeline 15. The pressure detection mechanism 13 is located at the good pulp outlet of the sander 9, and is electrically connected to the control mechanism 12. The pressure detection mechanism 13 is used to detect the pressure of the sizing agent exiting the pulp. One end of the pressure relief pipeline 15 is connected to the recovery tank 8, and the other end is connected to the pipeline between the sander 9 and the working tank 1. The first control switch 14 is located on the pressure relief pipeline 15 and is electrically connected to the control mechanism 12. The control mechanism 12 is used to receive and process the detection signal from the pressure detection mechanism 13, and to control the opening or closing of the first control switch 14. In this embodiment, the pressure detection mechanism 13 is a pressure sensor, and the first control switch 14 is a solenoid valve.

[0091] The pressure detection mechanism is set at the good slurry outlet of the desander 9 to detect the slurry pressure in real time and transmit the signal to the control mechanism 12. When the pressure detection mechanism detects that the good slurry outlet pressure of the desander 9 exceeds the threshold (e.g., 0.3MPa), the control mechanism 12 opens the first control switch 14, and part of the rubber material flows back to the recovery tank 8 through the pressure relief pipeline 15 to reduce the outlet pressure. This prevents the pipeline from bursting or the equipment from being damaged due to excessively high good slurry outlet pressure of the desander 9, ensuring the safe operation of the system and avoiding pressure fluctuations from affecting the stability of the rubber material return flow.

[0092] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system also includes a bypass pipe 16, a second control switch 17, and a third control switch 18. One end of the bypass pipe 16 is connected to the pipe between the filter mechanism 2 and the sizing machine 4, and the other end of the bypass pipe 16 is connected to the working trough 1. The second control switch 17 is located on the pipe between the filter mechanism 2 and the sizing machine 4. The third control switch 18 is located on the bypass pipe 16. The bypass pipe 16 is an auxiliary pipe used to flexibly adjust the direction of the adhesive flow. Both the second control switch 17 and the third control switch 18 are valves.

[0093] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system also includes a connecting pipe 19, a fourth control switch 20, and a fifth control switch 21. One end of the connecting pipe 19 is connected to the pipe between the vibrating screen 6 and the recovery tank 8, and the other end of the connecting pipe 19 is connected to the bypass pipe 16. The fourth control switch 20 is located on the pipe between the vibrating screen 6 and the recovery tank 8. The fifth control switch 21 is located on the connecting pipe 19. The connecting pipe 19 is an auxiliary pipe used to flexibly adjust the direction of the sizing agent flow. Both the fourth control switch 20 and the fifth control switch 21 are valves.

[0094] Specifically, in this embodiment, such as Figure 1 and Figure 2 As shown, during normal operation, the second and fourth control switches 20 are open, and the third and fifth control switches 21 are closed. When the glue applicator 4 is under maintenance, the second control switch 17 is closed and the third control switch 18 is opened, and the glue material flows back to the working tank 1 through the bypass pipe 16 to avoid system shutdown. When the vibrating screen 6 is under maintenance, the fourth control switch 20 is closed and the fifth control switch 21 is opened, and the remaining glue flows back through the connecting pipe 19 and the bypass pipe 16 to ensure continuous circulation, improve the flexibility of system maintenance, avoid overall shutdown due to local equipment maintenance, and reduce production losses.

[0095] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system also includes a first slag trough 22 and a sixth control switch 23. The first slag trough 22 is connected to the vibrating screen 6 via a pipeline, and the sixth control switch 23 is located on the pipeline between the first slag trough 22 and the vibrating screen 6. The first slag trough 22 is a trough for collecting impurities and waste generated by the filtration of the vibrating screen 6. The first slag trough 22 is connected to the vibrating screen 6 via a pipeline, and the sixth control switch 23 controls the slag discharge; the sixth control switch 23 is periodically opened to discharge impurities and waste into the first slag trough 22 for centralized processing. The sixth control switch 23 is a valve.

[0096] Optionally, in some embodiments, such as Figure 1 and Figure 2 As shown, the paper machine surface sizing system also includes a second slag trough 24 and a seventh control switch 25. The second slag trough 24 is connected to the sedimentation tank via a pipeline, and the seventh control switch 25 is located on the pipeline between the second slag trough 24 and the sedimentation tank. The second slag trough 24 is a tank for collecting impurities and waste generated during filtration in the sedimentation tank. The second slag trough is connected to the sedimentation tank via a pipeline, and the seventh control switch 25 controls the slag discharge; the seventh control switch 25 is periodically opened to discharge impurities and waste into the second slag trough 24 for centralized treatment. The seventh control switch 25 is a valve.

[0097] Specifically, the workflow of the paper machine surface sizing system in this embodiment is as follows:

[0098] 1. Rubber material supply and primary filtration: The rubber material in the working tank 1 is transported to the filtration mechanism 2 by the feeding pump 3. After the filtration mechanism 2 removes large particulate impurities, it enters the sizing machine 4.

[0099] 2. Glue application and excess glue recovery: The glue applicator 4 applies glue to the paper surface, and the excess glue is collected by the return hopper 5 and sent to the vibrating screen 6 by the conveying pump 7;

[0100] 3. Secondary purification and temporary storage: Vibrating screen 6 removes fine impurities, and the purified rubber material enters recycling tank 8;

[0101] 4. Deep purification and recycling: The adhesive material in the recycling tank 8 is sent to the desander 9 by the slurry pump 10. After the high-density impurities are separated, the good slurry is returned to the working tank 1 for reuse.

[0102] 5. Impurity treatment: The impurities intercepted by the vibrating screen 6 are discharged into the first slag tank 22. After the tail slurry of the sand remover 9 is treated by the sedimentation tank, the sediment is discharged into the second slag tank 24, and the supernatant is returned to the recovery tank 8.

[0103] Compared with existing technologies, this technical solution has the following beneficial effects:

[0104] 1. Multi-stage purification to improve the cleanliness of the adhesive: Through three-stage purification of “filtration mechanism 2 (primary filtration) → vibrating screen 6 (secondary filtration) → sand remover 9 (deep filtration)”, large particulate impurities, fine adhesives and high-density hard impurities are removed in sequence, effectively solving the problem of adhesive contamination and reducing particle streaks in adhesive film formation.

[0105] 2. Closed-loop recycling reduces waste and pollution: Residual adhesive is recycled and purified for reuse, reducing adhesive consumption; impurities are centrally treated through the first slag tank 22 and the second slag tank 24, avoiding the accumulation of impurities caused by the closed-loop circulation of white water, thus balancing environmental protection and economy.

[0106] 3. Protect equipment and reduce wear: Remove hard impurities and adhesives from the adhesive, reduce clogging of scrapers and sealing knives and wear of application rollers, extend equipment service life and reduce maintenance costs;

[0107] 4. Flexible control and guaranteed stability: The design of pressure relief system and bypass pipeline 16 improves the safety of system operation and the flexibility of maintenance, avoiding production interruption due to local failure.

[0108] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A paper machine surface sizing system, characterized in that, include: Working tank, the working tank being used to hold the adhesive material; A filtration mechanism, which is connected to the working tank via a pipeline; A feeding pump is installed on the pipeline between the filtration mechanism and the working tank; A sizing machine, which is connected to the filtering mechanism via a pipeline, is used to evenly apply adhesive to the surface of paper. A return hopper is provided below the glue application roller of the glue applicator, and the return hopper is used to recover excess glue material during the glue application process; A vibrating screen, wherein the vibrating screen is connected to the return hopper via a pipeline; A conveying pump is installed on the pipeline between the vibrating screen and the return hopper; A recycling tank, which is connected to the vibrating screen via a pipeline; A sand separator, wherein the inlet of the sand separator is connected to the recovery tank via a pipeline, and the good slurry outlet of the sand separator is connected to the working tank via a pipeline; And a slurry pump, which is installed on the pipeline between the recovery tank and the desander.

2. The paper machine surface sizing system according to claim 1, characterized in that: The paper machine surface sizing system also includes a settling tank, which is connected to the tail pulp outlet of the desander via a pipeline.

3. The paper machine surface sizing system according to claim 2, characterized in that: The sedimentation tank and the recovery tank are connected by pipelines.

4. The paper machine surface sizing system according to claim 1, characterized in that: The paper machine surface sizing system also includes a control mechanism, a pressure detection mechanism, a first control switch, and a pressure relief pipeline; The pressure detection mechanism is located at the good slurry outlet of the desander. The pressure detection mechanism is electrically connected to the control mechanism and is used to detect the pressure of the slurry discharged from the rubber compound. One end of the pressure relief pipeline is connected to the recovery tank, and the other end of the pressure relief pipeline is connected to the pipeline between the sand remover and the working tank; The first control switch is located on the pressure relief pipeline and is electrically connected to the control mechanism; The control mechanism is used to receive and process the detection signal from the pressure detection mechanism, and to control the opening or closing of the first control switch.

5. The paper machine surface sizing system according to claim 1, characterized in that: The paper machine surface sizing system also includes a bypass pipeline, a second control switch, and a third control switch; One end of the bypass pipe is connected to the pipe between the filter mechanism and the glue applicator, and the other end of the bypass pipe is connected to the working tank; The second control switch is located on the pipeline between the filtration mechanism and the adhesive applicator; The third control switch is located on the bypass pipeline.

6. The paper machine surface sizing system according to claim 5, characterized in that: The paper machine surface sizing system also includes a connecting pipe, a fourth control switch, and a fifth control switch. One end of the connecting pipe is connected to the pipe between the vibrating screen and the recycling tank, and the other end of the connecting pipe is connected to the bypass pipe. The fourth control switch is installed on the pipeline between the vibrating screen and the recycling tank; The fifth control switch is located on the connecting pipeline.

7. The paper machine surface sizing system according to claim 1, characterized in that: The paper machine surface sizing system also includes a first slag trough and a sixth control switch. The first slag trough is connected to the vibrating screen via a pipeline, and the sixth control switch is located on the pipeline between the first slag trough and the vibrating screen.

8. The paper machine surface sizing system according to claim 2, characterized in that: The paper machine surface sizing system also includes a second slag trough and a seventh control switch. The second slag trough is connected to the sedimentation tank via a pipeline, and the seventh control switch is located on the pipeline between the second slag trough and the sedimentation tank.

9. The paper machine surface sizing system according to claim 1, characterized in that: The filtration mechanism is a filter.

10. The paper machine surface sizing system according to claim 4, characterized in that: The pressure detection mechanism is a pressure sensor.

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