A nano-cement quick-insert type bead mill prepared by anhydrous wet method and a method thereof

Abstract

The application relates to the technical field of preparation of new grouting materials, and discloses a quick-insertion type bead-replacing sand mill prepared by a nano-cement anhydrous wet method and a method, which comprises a grinding cavity, a detachable filter tank, a feeding hopper, a push-pull type baffle, a motor and a discharge port. The grinding cavity is used for containing grinding medium and nano-cement materials to be ground, and a communication channel is arranged between the grinding cavity and the detachable filter tank to realize the transfer of the grinding medium and the materials between the two. Through the cooperative design of the communication channel between the grinding cavity and the detachable filter tank, the push-pull type baffle which is movably assembled, the filter screen in the detachable filter tank and the backflow pipeline, in combination with the centrifugal force generated by the rotation of the motor-driven main shaft, the grinding medium can be replaced under the condition that the main shaft continuously operates without shutdown, the time consumption for bead replacement is greatly shortened, meanwhile, the materials in the separation process can be sent back to the grinding cavity through the backflow pipeline to continue grinding, and the material waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of novel grouting material preparation technology, specifically to a quick-insertion bead-changing sand mill and method for the anhydrous wet preparation of nano-cement. Background Technology

[0002] Cement ultrafine grinding is a key method to solve the problem of injectability of grouting materials. Existing processes generally use dry preparation methods such as Raymond mills and air jet mills, but these methods generate heat quickly, consume a lot of energy, are prone to agglomeration, and are difficult to grind to the nanoscale. Compared with conventional ultrafine cement, nano-grade cement has superior injectability, but there is currently a lack of corresponding processing equipment. Due to the hydration reaction, traditional dry grinding is difficult to implement. Sand mills, as a type of quick-connect wet ultrafine grinding equipment, have been widely used in many fields such as chemical, pharmaceutical, coating, ink, and new energy materials, especially playing a crucial role in the preparation of nanomaterials. Theoretically, using ethanol as a grinding solvent, sand mills can solve the problem of nanoscale grinding of cement, but in practical applications, there are still some technical challenges that need to be addressed. Replacing grinding media is cumbersome and time-consuming: When changing grinding media in traditional sand mills, it is necessary to empty the material, stop the machine, open the grinding chamber, and manually remove the grinding media. This process is not only time-consuming but also labor-intensive, seriously affecting production efficiency.

[0003] After the experiment, cleaning the sand mill is difficult. Because the grinding chamber of a sand mill is usually a single unit, internal cleaning is challenging, easily leading to cross-contamination between different batches of materials and affecting product quality. Experimental continuity is poor: Changing grinding media and cleaning equipment requires considerable time, resulting in frequent production interruptions and impacting overall production efficiency. To address these shortcomings, there is an urgent need for a new type of grinding and sand mill that features quick-connect bead changing, easy cleaning, wear resistance, and continuous operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a quick-connect bead-changing sand mill and method for the anhydrous wet preparation of nano-cement, solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a quick-release bead-changing sand mill for the anhydrous wet preparation of nano-cement, comprising a grinding chamber, a detachable filter tank, a feed hopper, a push-pull baffle, a motor, and a discharge port. The grinding chamber is used to contain grinding media and nano-cement material to be ground, and a connecting channel is provided between the grinding chamber and the detachable filter tank to realize the transfer of grinding media and material between the two. The push-pull baffle is movably mounted at the connecting channel to control the on / off state between the grinding chamber and the detachable filter tank. The feed hopper is connected to the upper part of the grinding chamber and is used to feed grinding media and pretreated nano-cement material into the grinding chamber. The motor is driven by the main shaft inside the grinding chamber and provides power for grinding the material by driving the main shaft to rotate. The discharge port is connected to the lower part of the grinding chamber and is used to discharge the finished nano-cement material after grinding.

[0006] Preferably, the grinding chamber has a split structure, with the upper and lower parts connected and fixed by a detachable connector; when it is necessary to clean the inside of the grinding chamber, the upper and lower parts can be separated by disassembling the detachable connector, thereby exposing the internal space of the grinding chamber and achieving thorough cleaning.

[0007] Preferably, the detachable filter tank is equipped with a filter screen inside, the pore size of which is adapted to the particle size of the grinding media to trap the grinding media entering the detachable filter tank; the side wall of the detachable filter tank is also equipped with a return pipe, one end of which is connected to the inside of the detachable filter tank and the other end is connected to the inside of the grinding chamber, for returning the material separated in the detachable filter tank to the grinding chamber for further grinding.

[0008] Preferably, the push-pull baffle is made of a wear-resistant and corrosion-resistant material, and a sealing structure is provided between the push-pull baffle and the inner wall of the connecting channel to prevent material from leaking from the gap between them during the grinding process; the push-pull baffle can move back and forth in the horizontal direction, and the on / off state of the connecting channel can be quickly switched by the pulling action.

[0009] Preferably, the feed hopper is a detachable structure, and its inner wall is smoothed to reduce material adhesion and residue; the discharge port is provided with a control valve, and the discharge speed and discharge volume of the finished material can be controlled by adjusting the opening and closing degree of the control valve.

[0010] A method for using a quick-access bead-changing sand mill for the anhydrous wet preparation of nano-cement includes the following steps: Step 1: Determine whether the grinding media needs to be replaced during the grinding process based on the grinding process requirements of the nano-cement material to be ground; Step 2: If there is no need to replace the grinding media, start the motor to drive the main shaft in the grinding chamber to rotate. Add the grinding media and the pre-treated and evenly mixed nano-cement material into the grinding chamber through the feed hopper for continuous grinding. After the grinding reaches the preset requirements, open the control valve at the discharge port to collect the finished nano-cement material. Turn off the motor, disassemble the detachable connecting parts of the grinding chamber, separate the upper and lower parts of the grinding chamber, and thoroughly clean the inside of the grinding chamber. Step 3: If the grinding media needs to be replaced, start the motor to drive the main shaft in the grinding chamber to rotate. Add the initial grinding media and the pre-treated and evenly mixed nano-cement material into the grinding chamber through the feed hopper for the initial stage of grinding. When the grinding media needs to be replaced, pull the sliding baffle to open the connection between the grinding chamber and the detachable filter tank. Under the centrifugal force generated by the rotation of the main shaft, the grinding media and material in the grinding chamber are thrown into the detachable filter tank. The grinding media is trapped by the filter screen in the detachable filter tank, and the material returns to the grinding chamber through the return pipe. Push the sliding baffle back to its original position to close the connection. After the residual liquid in the detachable filter tank has completely drained, remove the detachable filter tank and take out the old grinding media. Add new grinding media through the feed hopper and continue the subsequent stage of grinding. After the overall grinding operation is completed, repeat the operation of collecting the finished material and cleaning the grinding chamber in Step 2.

[0011] This invention provides a quick-access bead-changing sand mill and method for the anhydrous wet preparation of nano-cement. It has the following beneficial effects: 1. This invention, through the coordinated design of the connecting channel between the grinding chamber and the detachable filter tank, the movable push-pull baffle, the filter screen inside the detachable filter tank, and the return pipeline, combined with the centrifugal force generated by the rotation of the main shaft driven by the motor, can complete the replacement of grinding media without stopping the machine while the main shaft is running continuously, greatly shortening the bead replacement time. At the same time, the material in the separation process can be sent back to the grinding chamber for further grinding through the return pipeline, reducing material waste. Moreover, the bead replacement process can be operated by a single person, significantly reducing the labor intensity of operators and effectively improving the production efficiency of anhydrous wet preparation of nano cement.

[0012] 2. This invention, with its split upper and lower grinding chamber structure and detachable connectors, allows for full exposure of the internal space of the grinding chamber after disassembly. Combined with a detachable feed hopper with a smooth inner wall, it enables thorough cleaning of the equipment's interior, preventing cross-contamination between different batches of nano-cement materials. Simultaneously, the sealing structure between the push-pull baffle and the inner wall of the connecting channel prevents material leakage during grinding, and the control valve at the discharge port allows for flexible adjustment of the finished product discharge speed and volume. This not only ensures the safety and reliability of the preparation process but also helps improve the quality stability of the finished nano-cement product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the detachable filter tank structure of the present invention; Figure 2 This is a schematic diagram of the push-pull baffle structure of the present invention; Figure 3 This is a schematic diagram of the laser particle size analyzer results for the preparation of nano-cement according to the present invention.

[0014] The components include: 1. Grinding chamber; 2. Detachable filter tank; 3. Feed hopper; 4. Push-pull baffle; 5. Motor; and 6. Discharge port. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a quick-connect bead-changing sand mill for the anhydrous wet preparation of nano-cement, comprising a grinding chamber 1, a detachable filter tank 2, a feed hopper 3, a push-pull baffle 4, a motor 5, and a discharge port 6. The grinding chamber 1 is used to contain grinding media and nano-cement material to be ground, and a connecting channel is provided between the grinding chamber 1 and the detachable filter tank 2 to realize the transfer of grinding media and material between the two. The push-pull baffle 4 is movably mounted at the connecting channel to control the on / off state between the grinding chamber 1 and the detachable filter tank 2. The feed hopper 3 is connected to the upper part of the grinding chamber 1 and is used to feed grinding media and pretreated nano-cement material into the grinding chamber 1. The motor 5 is connected to the main shaft inside the grinding chamber 1 and provides power for grinding the material by driving the main shaft to rotate. The discharge port 6 is connected to the lower part of the grinding chamber 1 and is used to discharge the finished nano-cement material after grinding.

[0017] Specifically, motor 5 serves as the power source, connected to the main shaft inside the grinding chamber 1. It drives the main shaft to rotate, providing grinding power to the grinding media and the nano-cement material to be ground within the grinding chamber 1. The grinding chamber 1, as the core working space, primarily accommodates the grinding media and material, providing a closed and stable environment for full contact and grinding. The feed hopper 3 connects to the upper part of the grinding chamber 1, allowing for the directional feeding of grinding media and pre-treated material into the chamber, preventing material splashing or residue during feeding. The connecting channel between the grinding chamber 1 and the detachable filter tank 2 provides a path for the transfer of media and material during the grinding process. A push-pull baffle 4 is movably mounted at this channel, and its on / off control allows for adjustment during normal grinding. The structure ensures that the material remains in the grinding chamber 1 for thorough grinding, while also allowing for the orderly flow of both when the medium or material needs to be transferred. The discharge port 6 is connected to the lower part of the grinding chamber 1, enabling efficient export of the finished nano-cement product. The entire structure forms a complete working link of "feeding-grinding-flowing-exporting". It not only helps achieve nano-level grinding precision through the stable power output of the motor 5, but also reduces material waste and simplifies the operation process by utilizing the convenient on / off control of the push-pull baffle 4, the directional feeding design of the feed hopper 3, and the closed containment function of the grinding chamber 1. At the same time, it provides a structural basis for subsequent replacement of the grinding medium using the detachable filter tank 2, effectively meeting the high efficiency and stability requirements of the anhydrous wet preparation of nano-cement.

[0018] The grinding chamber 1 has a split structure, with the upper and lower parts connected and fixed by a detachable connector. When it is necessary to clean the inside of the grinding chamber 1, the upper and lower parts can be separated by disassembling the detachable connector, thereby exposing the internal space of the grinding chamber 1 and achieving thorough cleaning.

[0019] Specifically, during normal grinding operations, the connector ensures a tight fit between the upper and lower cavities, providing a closed and stable grinding space for the grinding media and nano-cement materials, preventing material leakage or grinding pressure imbalance. When cleaning is required, disassembling the connector separates the upper and lower cavities, fully exposing the previously hidden inner walls and corners of grinding chamber 1. This allows operators to directly clean residual materials and grinding impurities, achieving thorough cleaning. This design ensures structural stability during the grinding process while addressing the pain point of incomplete cleaning in traditional equipment. Its effect is to effectively prevent cross-contamination between different batches of nano-cement materials due to residues, improving the stability of finished product quality. Simultaneously, it simplifies the cleaning process, reduces operator workload, and aligns with the equipment's overall quick-connect bead replacement and high-efficiency preparation requirements, further ensuring the continuity and reliability of the anhydrous wet preparation of nano-cement.

[0020] The removable filter tank 2 is equipped with a filter screen inside, and the pore size of the filter screen is adapted to the particle size of the grinding media to intercept the grinding media entering the removable filter tank 2. The side wall of the removable filter tank 2 is also equipped with a return pipe. One end of the return pipe is connected to the inside of the removable filter tank 2, and the other end is connected to the inside of the grinding chamber 1, which is used to return the material separated in the removable filter tank 2 to the grinding chamber 1 for further grinding.

[0021] Specifically, the pore size of the internal filter screen is precisely matched with the particle size of the grinding media. Relying on the screening effect, it can efficiently intercept the grinding media entering the tank, preventing the media from being lost with the material. The return pipe set on the side wall is connected to the inside of the detachable filter tank 2 and the inside of the grinding chamber 1 at both ends, respectively, to construct a circulation path for the separated material. The function of this structure is to achieve effective separation of the media and material when the grinding media needs to be replaced, avoiding the media from mixing into the material and affecting the subsequent grinding accuracy. It can also guide the separated material back to the grinding chamber 1 to continue grinding, reducing material waste. Its effect is that, together with the connection channel controlled by the push-pull baffle 4, it ensures the continuity of nano-cement material grinding in the process of changing grinding media without stopping the machine. There is no need to empty the material when changing the media, which shortens the operation time and improves the material utilization rate. It further adapts to the requirements of equipment efficiency and production stability for the anhydrous wet preparation of nano-cement.

[0022] The push-pull baffle 4 is made of wear-resistant and corrosion-resistant material, and a sealing structure is provided between the push-pull baffle 4 and the inner wall of the connecting channel to prevent material from leaking from the gap between them during the grinding process; the push-pull baffle 4 can move back and forth in the horizontal direction, and quickly switch the on and off state of the connecting channel by pulling action.

[0023] Specifically, the push-pull baffle 4 is made of wear-resistant and corrosion-resistant material, which can adapt to the frictional environment between the material and the grinding media and the possible chemical erosion during the anhydrous wet grinding of nano-cement. This effectively reduces the wear and corrosion of the baffle, extends its service life, and ensures long-term stable operation. At the same time, the sealing structure between it and the inner wall of the connecting channel can strictly block the path of material leakage from the gap between the two during the grinding process, avoiding material waste and preventing external impurities from entering the channel and affecting the purity of the material, thus ensuring the sealing of the grinding environment. In addition, the push-pull baffle 4 can move back and forth in the horizontal direction. The opening and closing state of the connecting channel between the grinding chamber 1 and the detachable filter tank 2 can be quickly switched by a simple pull action. During normal grinding, the channel is closed to ensure that the material is fully ground in the grinding chamber 1. When the grinding media needs to be replaced, the channel is opened to allow the media and material to enter the detachable filter tank 2 smoothly. There is no need to disassemble the equipment or shut down for a long time, which greatly simplifies the operation process, improves the efficiency of grinding media replacement, and further ensures the continuity and stability of the nano-cement preparation process.

[0024] The feed hopper 3 is a detachable structure, and its inner wall is smoothed to reduce material adhesion and residue; the discharge port 6 is equipped with a control valve, and the discharge speed and discharge volume of the finished material can be controlled by adjusting the opening and closing degree of the control valve.

[0025] Specifically, the detachable structure of the feed hopper 3 facilitates individual disassembly for deep cleaning after use, preventing residual materials from growing or accumulating inside the hopper. The smooth inner wall treatment significantly reduces the adhesion and residue of nano-cement materials and grinding media during the feeding process, reducing material waste and preventing cross-contamination between different batches of materials due to residue, ensuring the cleanliness and material utilization rate of the feeding process. The control valve at the discharge port 6 can flexibly control the discharge speed and volume of the finished nano-cement material after grinding by adjusting the opening and closing degree. This avoids excessively fast discharge causing overflow in the collection container, and also prevents excessively slow discharge causing material to stagnate in the grinding chamber 1, affecting subsequent grinding processes, ensuring the stability and controllability of the finished product collection process. Overall, it is compatible with the core requirements of efficient preparation and convenient operation of the equipment, further improving the smoothness and reliability of the anhydrous wet preparation process of nano-cement.

[0026] A method for using a quick-access bead-changing sand mill for the anhydrous wet preparation of nano-cement includes the following steps: Step 1: Determine whether the grinding media needs to be replaced during the grinding process based on the grinding process requirements of the nano-cement material to be ground; Step 2: If there is no need to replace the grinding media, start the motor 5 to drive the main shaft in the grinding chamber 1 to rotate, and add the grinding media and the pre-treated and evenly mixed nano cement material into the grinding chamber 1 through the feed hopper 3 for continuous grinding; after the grinding reaches the preset requirements, open the control valve at the discharge port 6 to collect the finished nano cement material; turn off the motor 5, disassemble the detachable connecting parts of the grinding chamber 1, separate the upper and lower parts of the grinding chamber 1, and thoroughly clean the inside of the grinding chamber 1; Step 3: If the grinding media needs to be replaced, start motor 5 to drive the main shaft in grinding chamber 1 to rotate. Add the initial grinding media and the pre-treated and evenly mixed nano-cement material into grinding chamber 1 through feed hopper 3 for initial stage grinding. When the grinding media needs to be replaced, pull the push-pull baffle 4 to open the communication channel between grinding chamber 1 and detachable filter tank 2. Under the centrifugal force generated by the rotation of the main shaft, the grinding media and material in grinding chamber 1 are thrown into detachable filter tank 2. The grinding media is trapped by the filter screen in detachable filter tank 2, and the material returns to grinding chamber 1 through the return pipe. Push the push-pull baffle 4 back to its original position to close the communication channel. After the residual liquid in detachable filter tank 2 has completely drained, remove detachable filter tank 2 and take out the old grinding media. Add new grinding media through feed hopper 3 and continue the subsequent stage grinding. After the overall grinding operation is completed, repeat the operation of collecting finished material and cleaning grinding chamber 1 in step 2.

[0027] In the specific implementation, when preparing nano-cement, the motor is started to run the grinding chamber. Then, cement, ethanol, and zirconium oxide beads are added from the feed hopper in a 1:1:1 ratio. After primary grinding, a push-pull baffle is pulled out to collect the zirconium beads ground by the main unit into a detachable filter tank. Secondary grinding zirconium beads are then added from the feed inlet to clean the previous zirconium beads from the filter tank. Multi-stage grinding significantly reduces grinding time. The process of replacing zirconium beads is repeated. The experiment ends after four grinding cycles. The discharge port is opened to collect the material, and the mill is cleaned. The laser particle size analyzer results for the nano-cement preparation are shown below. Figure 3 As shown.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-access bead-changing sand mill for anhydrous wet preparation of nano-cement, characterized in that, The device includes a grinding chamber (1), a detachable filter tank (2), a feed hopper (3), a push-pull baffle (4), a motor (5), and a discharge port (6). The grinding chamber (1) is used to contain grinding media and nano-cement materials to be ground. A connecting channel is provided between the grinding chamber (1) and the detachable filter tank (2) to realize the transfer of grinding media and materials between the two. The push-pull baffle (4) is movably assembled at the connecting channel to control the on / off state between the grinding chamber (1) and the detachable filter tank (2). The feed hopper (3) is connected to the upper part of the grinding chamber (1) and is used to feed grinding media and pretreated nano cement material into the grinding chamber (1); the motor (5) is connected to the main shaft inside the grinding chamber (1) and provides power for grinding the material by driving the main shaft to rotate; the discharge port (6) is connected to the lower part of the grinding chamber (1) and is used to discharge the finished nano cement material after grinding.

2. The quick-connect bead-changing sand mill for anhydrous wet preparation of nano-cement according to claim 1, characterized in that, The grinding chamber (1) is a split structure with the upper and lower parts connected and fixed by a detachable connector. When it is necessary to clean the inside of the grinding chamber (1), the upper and lower parts can be separated by disassembling the detachable connector, thereby exposing the internal space of the grinding chamber (1) and achieving thorough cleaning.

3. The quick-connect bead-changing sand mill for anhydrous wet preparation of nano-cement according to claim 1, characterized in that, The detachable filter tank (2) is equipped with a filter screen inside. The pore size of the filter screen is adapted to the particle size of the grinding medium to intercept the grinding medium entering the detachable filter tank (2). The side wall of the detachable filter tank (2) is also equipped with a return pipe. One end of the return pipe is connected to the inside of the detachable filter tank (2), and the other end is connected to the inside of the grinding chamber (1) to return the material separated in the detachable filter tank (2) to the grinding chamber (1) for further grinding.

4. The quick-connect bead-changing sand mill for anhydrous wet preparation of nano-cement according to claim 1, characterized in that, The push-pull baffle (4) is made of wear-resistant and corrosion-resistant material, and a sealing structure is provided between the push-pull baffle (4) and the inner wall of the connecting channel to prevent material from leaking from the gap between them during the grinding process; the push-pull baffle (4) can move back and forth in the horizontal direction and quickly switch the on and off state of the connecting channel by pulling action.

5. The quick-connect bead-changing sand mill for anhydrous wet preparation of nano-cement according to claim 1, characterized in that, The feed hopper (3) is a detachable structure, and its inner wall is smoothed to reduce material adhesion residue; the discharge port (6) is equipped with a control valve, and the discharge speed and discharge amount of the finished material can be controlled by adjusting the opening and closing degree of the control valve.

6. A method of using a quick-insertion bead-changing sand mill for anhydrous wet preparation of nano-cement, as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Determine whether the grinding media needs to be replaced during the grinding process based on the grinding process requirements of the nano-cement material to be ground; Step 2: If there is no need to replace the grinding media, start the motor (5) to drive the main shaft in the grinding chamber (1) to rotate, and add the grinding media and the pre-treated and evenly mixed nano cement material into the grinding chamber (1) through the feed hopper (3) for continuous grinding. After the grinding reaches the preset requirements, open the control valve at the discharge port (6) to collect the finished nano cement material; turn off the motor (5), disassemble the detachable connecting parts of the grinding chamber (1), separate the upper and lower parts of the grinding chamber (1), and thoroughly clean the inside of the grinding chamber (1); Step 3: If the grinding media needs to be replaced, start the motor (5) to drive the main shaft in the grinding chamber (1) to rotate, and add the initial grinding media and the pre-treated and evenly mixed nano cement material into the grinding chamber (1) through the feed hopper (3) for initial stage grinding; When the grinding media needs to be replaced, the pull-pull baffle (4) opens the communication channel between the grinding chamber (1) and the detachable filter tank (2). Under the centrifugal force generated by the rotation of the main shaft, the grinding media and materials in the grinding chamber (1) are thrown into the detachable filter tank (2). The grinding media is intercepted by the filter screen in the detachable filter tank (2), and the materials are returned to the grinding chamber (1) through the return pipe. The pull-pull baffle (4) is pushed back to its original position to close the communication channel. After the residual liquid in the detachable filter tank (2) has completely drained, the detachable filter tank (2) is removed and the old grinding media is taken out. New grinding media is added through the feed hopper (3) and the subsequent grinding stages are continued. After the overall grinding operation is completed, the operation of collecting finished materials and cleaning the grinding chamber (1) in step 2 is repeated.

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