A stud roller sleeve for vertical roller milling

Abstract

The utility model provides a kind of stud roller sleeve for vertical roller mill, it is characterized by including base body, stud unit, the base body is the core support structure of stud roller sleeve, it is conical toroidal, the stud unit is evenly distributed and is installed in the outer surface of base body, the base body is detachably connected with stud, the utility model improves base body, stud unit, base body, stud unit is set to differentiating screw thread stud mounting hole distribution and wear-resistant stud structure, reaches the purpose of improving overall wear resistance, prolonging service life: base body is designed differentiating screw thread stud mounting hole distribution according to different area wear degree, and stud unit is made of wear-resistant hard alloy material and has spherical end portion, so that the area of serious wear is protected more densely, while the excellent wear resistance of stud unit and bidirectional use design effectively cope with high-strength friction in material grinding process, solve the problem of uneven wear of existing roller sleeve, short service life.

Description

Technical Field

[0001] This utility model relates to the technical field of vertical roller mill equipment, and in particular to a pin roller sleeve for vertical roller mills. Background Technology

[0002] Vertical roller mills are widely used in grinding processes in industries such as cement, mining, and chemicals. Their main working components include a grinding disc and grinding rollers. Materials are crushed and ground under the squeezing and grinding action of the grinding disc and rollers. Because the grinding rollers and materials are under constant high-intensity friction, the roller surface is prone to severe wear. To extend the service life of the grinding rollers and reduce equipment maintenance costs, wear-resistant roller sleeves are usually fitted onto the outer surface of the grinding rollers. Replacing the worn roller sleeves restores the normal working performance of the grinding rollers without requiring repair or replacement of the roller body, significantly improving equipment operation and maintenance efficiency.

[0003] The existing technology, CN223276330U, describes a segmented large roller sleeve structure, comprising: a grinding roller mounted on a vertical grinding mill, with segmented roller sleeves installed on the grinding roller; the segmented roller sleeve is composed of at least one single-segment roller sleeve spliced ​​together; the segmented roller sleeve also includes a limiting component installed on the segmented roller sleeve; a fixing component is provided between the single-segment roller sleeve and the limiting component for fixing, the limiting component being an annular hub installed on the segmented roller sleeve, the single-segment roller sleeve having a connecting ear with a circular hole, the annular hub having a connecting hole adapted to the circular hole, and the fixing component being a hub pin and a hub pin sleeve installed on the circular hole and the connecting hole. The segmented roller sleeve is easy to replace, has good wear resistance, can reduce the processing cost and casting difficulty of large roller sleeves in the manufacturing process, and the annular hub can effectively increase the strength of the segmented roller sleeve during use.

[0004] Problems identified in the existing technology: Although the segmented roller sleeve has the characteristics of easy replacement and good wear resistance, which can reduce the processing cost and casting difficulty in the manufacturing process of large roller sleeves, and the annular hub can increase the strength of the segmented roller sleeve, there is still room for improvement in terms of dealing with the wear difference in different areas of the roller sleeve, further improving the wear resistance performance, and simplifying the replacement process of individual worn parts. Utility Model Content

[0005] In view of the above technical problems, the present invention provides a pin roller sleeve for vertical roller mill, characterized in that it includes a base and pin units. The base is the core support structure of the pin roller sleeve and is in the shape of a conical ring. The pin units are evenly distributed and installed on the outer surface of the base. The base and the pin units are detachably connected by threads.

[0006] The substrate is a conical annular shape, and its surface has multiple threaded stud mounting holes with different diameters. The threaded stud mounting holes at the larger end of the substrate are densely arranged and are small-diameter holes. The threaded stud mounting holes at the outer edge of the smaller end of the substrate are relatively sparse and are large-diameter holes. The diameter and distribution of the threaded stud mounting holes are carefully designed to adapt to different working conditions and wear patterns. This design allows the substrate to better adapt to different wear zones of the grinding roller, ensuring stability and durability under high load and high temperature environments.

[0007] The stud unit includes large-size studs and small-size studs. Small-size studs are installed in the mounting holes of the small-size threaded studs, and large-size studs are installed in the mounting holes of the large-size threaded studs. The middle portion of the large-size studs has large-size stud threads, and the middle portion of the small-size studs has small-size stud threads. The large-size studs have a first groove and a second groove, and the middle portion of the small-size studs has a first groove and a second groove. The two ends of the large-size studs are a first spherical surface and a second spherical surface, respectively, and the two ends of the small-size studs are a first spherical surface and a second spherical surface, respectively. The spherical structures at both ends of the same specification stud are completely identical. When one end wears down, the stud can be disassembled and reversed for installation, allowing the unworn spherical end to continue working, achieving bidirectional use and extending service life. The stud unit achieves precise connection through its external thread structure and the internal thread of the stud mounting hole on the base. Each stud unit contains a large-specification stud and a small-specification stud top, each corresponding to a threaded stud mounting hole. During installation, anti-loosening agent can be evenly distributed on the outer surface of the base to ensure wear-resistant protection from the stud unit in all areas. When applied to the external thread structure of the stud unit, the anti-loosening agent fills the gaps between the threads after the stud unit is screwed into the threaded stud mounting hole, enhancing the friction and sealing of the threaded connection. This effectively prevents the stud from loosening due to vibration during equipment operation, ensuring the stud unit remains firmly installed and guaranteeing its stability. During normal operation of the equipment, the stud unit is designed with multiple diameters to accommodate threaded stud mounting holes of different diameters on the base. This diverse design allows the stud unit to be flexibly replaced according to actual wear conditions, ensuring optimal wear performance and service life. During installation, the axis of the stud unit is aligned with the axis of the threaded stud mounting hole, ensuring that the stud unit is installed vertically on the base and avoiding tilting. This ensures that the stud unit is subjected to uniform force, reducing localized wear. The threads in the middle of the stud unit facilitate disassembly and assembly using maintenance tools. Users can easily remove the stud unit from the base with a wrench and reverse or replace it with a new stud unit, thus achieving rapid maintenance and replacement and significantly reducing equipment downtime. The stud unit is an important component of the stud roller sleeve and is made of wear-resistant hard alloy material.

[0008] The beneficial effects of this utility model are as follows: This invention improves the substrate and stud unit by setting a differentiated distribution of threaded stud mounting holes and a wear-resistant stud unit structure, thereby enhancing overall wear resistance and extending service life. The substrate features a differentiated distribution of threaded stud mounting holes designed according to the wear degree of different areas. Combined with stud units made of wear-resistant hard alloy material with spherical ends, the severely worn areas receive denser wear protection. At the same time, the excellent wear resistance and bidirectional design of the stud unit effectively cope with the high-intensity friction during material grinding, solving the problems of uneven wear and short service life of existing roller sleeves.

[0009] This invention improves the connection between the base and the stud unit. The base and stud unit are designed with threaded connection and anti-loosening agent structure, which achieves the purpose of easy replacement and reduced maintenance costs. The stud unit and the base are connected by threads, and with the anti-loosening agent, it not only ensures the stability of the installation, but also makes the disassembly and assembly of the stud unit simple and easy. When individual stud units are worn, it is not necessary to replace the entire roller sleeve. The worn stud unit can be disassembled and replaced simply by using a wrench or other tools. This greatly reduces equipment downtime, reduces the manpower and material costs of maintenance, and solves the problems of difficult replacement and high maintenance costs of the existing whole roller sleeve.

[0010] The base and stud unit components are designed as a modular combination structure, which simplifies the manufacturing process and facilitates large-scale production. The stud roller sleeve is composed of a base, stud units and anti-loosening agent. Each component can be manufactured separately in a standardized manner, making the manufacturing process relatively simple and easy to achieve mass production. At the same time, the modular structural design also makes it easy to control the quality of each component individually, improving the overall product quality stability and solving the problems of high manufacturing difficulty and low production efficiency of some existing complex structure roller sleeves. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of a pin-shaped roller sleeve for a vertical roller mill according to the present invention. Figure 2 This is a schematic diagram of the base of a column nail roller sleeve for a vertical roller mill according to the present invention. Figure 3 This is a schematic diagram of the pins of a pin-mounted roller sleeve for a vertical roller mill, as described in this utility model, mounted on a base. Figure 4 This is a structural diagram of the end face of a pin roller sleeve for a vertical roller mill according to the present invention. Figure 5 This is a side view of a pin roller sleeve for a vertical roller mill according to the present invention. Figure 6 This is a schematic diagram of a large-size column nail for a column nail roller sleeve used in a vertical roller mill, according to the present invention. Figure 7 This is a schematic diagram of a small-sized column pin for a column pin roller sleeve used in a vertical roller mill, according to this utility model.

[0012] As shown in the figure: 1 is the base; 2 is a large-size stud; 3 is a small-size stud; 11 is the unthreaded stud mounting hole of the base; 12 is the mounting hole of the large-size threaded stud; 13 is the mounting hole of the small-size threaded stud; 21 is the first spherical surface of the large-size stud; 22 is the first groove of the large-size stud; 23 is the thread of the large-size stud; 24 is the second groove of the large-size stud; 25 is the second spherical surface of the large-size stud; 31 is the first spherical surface of the small-size stud; 32 is the first groove of the small-size stud; 33 is the thread of the small-size stud; 34 is the second groove of the small-size stud; 35 is the second spherical surface of the small-size stud. Detailed Implementation Example 1

[0013] This utility model provides a stud roller sleeve for vertical roller mills, characterized in that the base 1 is in the shape of a conical ring, and the surface of the base 1 is provided with a plurality of threaded stud mounting holes. The threaded stud mounting holes on the base 1 have different diameters. The threaded stud mounting holes located at the large end of the base are densely arranged and are small-sized threaded stud mounting holes 13, while the threaded stud mounting holes located at the small end of the base are sparsely arranged and are large-sized threaded stud mounting holes 12. The stud unit includes a large-size stud 2 and a small-size stud 3. The small-size stud 3 is installed in the small-size threaded stud mounting hole 13, and the large-size stud 2 is installed in the large-size threaded stud mounting hole 12. The middle part of the large-size stud 2 is provided with a large-size stud thread 23, and the middle part of the small-size stud 3 is provided with a small-size stud thread 33. The large-size stud 2 has a large-size stud first groove 22 and a large-size stud second groove 24. The middle part of the small-size stud 3 has a small-size stud first groove 32 and a small-size stud second groove 34. The two ends of the large-size stud 2 are a large-size stud first spherical surface 21 and a large-size stud second spherical surface 25, respectively. The two ends of the small-size stud 3 are a small-size stud first spherical surface 31 and a small-size stud second spherical surface 35, respectively. Example 2

[0014] When using this utility model, the first step is to assemble the pin roller sleeve with the grinding roller of the vertical roller mill. Align the completed base 1 with the outer surface of the grinding roller and fix the base to the grinding roller with bolt assembly. Ensure that the unthreaded pin mounting hole part 11 of the base fits tightly with the grinding roller to avoid displacement during equipment operation.

[0015] After assembly, the equipment is started. When the material is squeezed and ground between the grinding disc and the roller sleeve, the large-sized pins 2 and the small-sized pins 3 are in direct contact with the material. They withstand friction due to the wear-resistant hard alloy material. The small-sized pins 3 are installed in the larger end area of ​​the base where wear is more severe. The densely distributed design can enhance the wear resistance of this area. The large-sized pins 2 are distributed at the smaller end of the base, which is suitable for relatively lighter wear conditions.

[0016] During equipment operation, it is necessary to periodically stop the machine to check the status of the stud units. If excessive wear is found on the spherical surface of some stud units, a wrench can be used to remove the worn studs through the threads in the middle of the stud unit (thread 23 for large-size studs and thread 33 for small-size studs). During disassembly, the first and second grooves of the stud unit can be used to help the tool to wedge and avoid slippage. Before replacing the stud unit, anti-loosening agent should be reapplied to the threaded part. Then, align the new stud unit with the corresponding threaded stud mounting hole and screw it in vertically. Tighten it to the specified torque to ensure that the axis of the stud unit coincides with the axis of the mounting hole and that the spherical surface fits the base surface without gaps. Finally, check the installation status of all stud units again. After confirming that everything is correct, the equipment can be restarted.

[0017] After the equipment has been running for a long time, if the base body shows slight deformation or the mounting holes are worn, the base body can be repaired without replacing the whole unit. If only one side of the spherical surface of the stud unit is worn, the stud unit can be disassembled and installed in reverse. The unworn spherical surface, such as the second spherical surface 25 of a large-sized stud, can be used to replace the first spherical surface 21 for continued use, further extending the service life of the stud unit and reducing maintenance costs. Example 3

[0018] The following detailed description of the column nail roller sleeve and its manufacturing method, in conjunction with the accompanying drawings and specific embodiments, provides a comprehensive overview of this utility model.

[0019] 1. Base 1 Creation Step 1: Material Selection High-strength steel (such as ZG20SiMn) is selected as the matrix material. This material has good mechanical and weldability and can meet the requirements of vertical roller mill in high load and high temperature environments.

[0020] Step 2: Cutting and Shaping According to the specifications of vertical roller mill grinding rollers, a conical annular base 1 is manufactured with an outer diameter of 2600mm at the large end, an outer diameter of 2300mm at the small end, and a thickness of 200mm. The shape of base 1 is as follows. Figure 1 , 2 As shown in Figure 1 of 3. A CNC machine tool is used to cut the substrate 1 according to the design dimensions, ensuring that the dimensional accuracy and shape tolerances of the substrate 1 meet the requirements.

[0021] Step 3: Heat Treatment The cut substrate 1 is heat-treated to improve its hardness and wear resistance. The heat treatment process includes heating to 850°C, holding at that temperature for 2 hours, and then cooling to room temperature in air. After heat treatment, the hardness of substrate 1 can reach HB250-300, which can effectively improve its service life under high stress and high temperature environments.

[0022] Step 4: Arrangement of threaded stud mounting holes Threaded stud mounting holes are arranged on the surface of substrate 1. The diameter and density of the holes are designed based on actual wear conditions and operational requirements. Threaded stud mounting holes with a diameter of 30mm and a depth of 60mm, and those with a diameter of 20mm and a depth of 45mm are arranged on the surface of substrate 1. The arrangement of the threaded stud mounting holes is based on the experience that the large end of the grinding roller surface of a vertical roller mill wears faster than the small end; therefore, the threaded stud mounting holes are densely distributed near the large end of substrate 1 and sparsely distributed near the small end. Specifically, the threaded stud mounting holes near the large end of substrate 1 are 20mm in diameter and 45mm in depth, distributed in 9 radial rows with 240 holes per row, totaling 2160 holes; the threaded stud mounting holes near the small end of substrate 1 are 30mm in diameter and 60mm in depth, distributed in 12 radial rows with 160 holes per row, totaling 1920 holes. The total number of threaded stud mounting holes on substrate 1 is 4080.

[0023] 2. Method for fabricating column nail units The fabrication of the stud unit is an important component of the stud roller sleeve, and its fabrication process is as follows: Step 1: Material Selection Wear-resistant cemented carbide materials (such as tungsten carbide) are selected as the raw materials for the stud units. This material has excellent wear resistance and impact resistance, and can maintain good performance under high load and high temperature environments.

[0024] Step 2: Cutting and Shaping According to design requirements, wear-resistant cemented carbide material is cut into cylinders of different diameters and lengths to ensure that the diameter and length of the stud unit match the diameter and depth of the threaded stud mounting holes on base 1. Specific specifications are as follows: Large-size post nail 2: 30mm in diameter, 70mm in length, with both ends machined into a spherical shape, such as... Figure 6 As shown.

[0025] Small-sized post pin 3: 20mm in diameter, 50mm in length, with both ends machined into a spherical shape, such as... Figure 7 As shown.

[0026] The spherical design at both ends of the stud unit effectively disperses stress, reduces wear, and extends service life.

[0027] Step 3: Heat Treatment The formed stud units undergo heat treatment to improve their hardness and wear resistance. The heat treatment process includes heating to 1050℃, holding for 1 hour, followed by oil quenching, and finally tempering at 200℃ for 2 hours. The heat-treated stud units achieve a hardness of HRC58-62, effectively improving their wear resistance.

[0028] Step 4: Thread machining A thread is machined in the middle of the stud unit. The thread size is designed according to the diameter of the stud mounting hole on the base 1 to ensure that the stud unit can be securely mounted on the base 1. The specific thread specifications are as follows: Large-size stud pin 2: The center is machined with an M30 thread, with a thread length of 50mm, such as... Figure 6 As shown in Figure 23.

[0029] Small-sized stud pin 3: The center is machined with an M20 thread, the thread length is 30mm, such as... Figure 7 As shown in Figure 33.

[0030] The machining accuracy of the threads directly affects the installation and disassembly efficiency of the stud unit. Therefore, it is necessary to strictly control the machining process to ensure the accuracy and surface quality of the threads.

[0031] Step 5: Groove Machining A groove is machined at the junction of the spherical and cylindrical surfaces of the stud. The groove has a diameter of 20mm and a depth of 5mm. Figure 6 22, 24 and Figure 6 As shown in Figures 32 and 34. This design not only enhances the connection stability between the stud unit and the base 1, but also effectively disperses stress and reduces wear during use.

[0032] Through the above steps, the produced stud unit not only has excellent wear resistance, but also perfectly matches the size of the threaded stud mounting holes on the base 1, ensuring efficient grinding and convenient maintenance and replacement in the actual use of the vertical roller mill.

[0033] 3. Installation of column nail unit The installation of the stud unit is a crucial step in the stud roller sleeve assembly process, such as... Figure 1 , 3 As shown, the specific steps are as follows: Step 1: Preparation Before installing the stud unit, it is essential to ensure that both the base 1 and the stud unit are clean and intact. Inspect the threaded stud mounting holes on the base 1 to ensure there are no impurities or burrs inside, which could affect the installation of the stud unit. Simultaneously, inspect the threaded portion of the stud unit to ensure the threads are undamaged and the spherical surface is free of wear, guaranteeing proper installation and use of the stud unit.

[0034] To ensure smooth installation and extend the service life of the post nail units, an appropriate amount of anti-loosening agent should be applied to the threaded portion of the post nail unit. The selection of the anti-loosening agent should be based on the actual working environment and material properties to ensure that it maintains good anti-loosening performance under high temperature and high load conditions.

[0035] Step 2: Installation of the Column Pin Unit Align the threaded end of the stud unit with the threaded stud mounting hole on the base 1, and gently rotate the stud unit to gradually screw it into the hole. During screwing, keep the stud unit vertical, avoiding tilting or skewing, to ensure a tight fit between the stud unit and the base 1. Use a wrench or other suitable tool to tighten the stud unit to the specified torque value, ensuring it is securely mounted on the base 1. During tightening, avoid overtightening to prevent damage to the threads or the base 1.

[0036] Step 3: Installation Inspection After the stud units are installed, inspect them to ensure that all stud units are securely installed without any looseness or incomplete screwing. Inspect the spherical portion of the stud unit to ensure it fits tightly against the surface of base 1 without any obvious gaps. Simultaneously, inspect the grooved portion of the stud unit to ensure there is no interference between it and the hole wall of base 1, thus guaranteeing the stability and wear resistance of the stud units during use.

[0037] Step 4: Follow-up processing After the installation and inspection of the stud unit are completed, the surface of the stud unit can be protected as needed, such as by applying anti-rust paint or anti-corrosion agent, to further improve the corrosion resistance of the stud unit. At the same time, the entire liner plate should be visually inspected to ensure that there are no obvious defects or damage, so as to guarantee its safety and reliability in actual use.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. The various components mentioned in this invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pin-shaped roller sleeve for a vertical roller mill, characterized in that... The device includes a base and stud units. The stud units are evenly distributed and installed on the outer surface of the base. The base is a conical annular shape. The surface of the base has multiple threaded stud mounting holes with different diameters. The threaded stud mounting holes located at the large end of the base are densely arranged and are small-diameter threaded stud mounting holes. The threaded stud mounting holes located at the outer edge of the small end of the base are relatively sparse and are large-diameter threaded stud mounting holes.

2. The pin-shaped roller sleeve for a vertical roller mill according to claim 1, characterized in that, The stud unit includes large-size studs and small-size studs. Small-size studs are installed in the mounting holes of the small-size threaded studs, and large-size studs are installed in the mounting holes of the large-size threaded studs. The middle portion of the large-size studs has large-size stud threads, and the middle portion of the small-size studs has small-size stud threads. The large-size studs have a first groove and a second groove, and the middle portion of the small-size studs has a first groove and a second groove. The two ends of the large-size studs are a first spherical surface and a second spherical surface, respectively, and the two ends of the small-size studs are a first spherical surface and a second spherical surface, respectively.

3. A pin-shaped roller sleeve for a vertical roller mill according to claim 1, characterized in that, The base and the stud unit are detachably connected by threads.

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