A grinding roller device for vertical roller mills and a method for mounting adjustment pads thereof

Abstract

The application discloses a grinding roller device for vertical roller mill and a mounting method of an adjusting gasket of the grinding roller device, which comprises a grinding roller shaft, bearings, a wheel hub, a roller sleeve, a pressing assembly and a sealing assembly. Two single-row tapered bearings are arranged between the grinding roller shaft and the wheel hub, and an adjusting gasket and an axle end pressing plate are arranged at the tail end of the grinding roller shaft to adjust the play of the bearings. A sensor is arranged on the axle end pressing plate to detect the temperature and vibration of the grinding roller. The roller sleeve is fixed to the outer side of the wheel hub through the pressing assembly. The sealing assembly comprises a transparent cover, a shaft sleeve, two oil seals and a sealing frame, and adopts a sealing structure of 'grinding external air + two oil seals', so that the service life of the oil seal is prolonged.

Description

Technical Field

[0001] This invention relates to a grinding roller device for a vertical roller mill, and more particularly to a grinding roller device for a vertical roller mill and a method for installing the adjusting shims thereon. Background Technology

[0002] The grinding roller is the core component of a vertical mill. Material is crushed under the powerful pressure of the roller, which rotates around its axis driven by the rotation of the grinding disc. Traditional grinding roller systems typically employ a combination of cylindrical roller bearings and double-row tapered roller bearings, or cylindrical bearings and double-row self-aligning bearings. These configurations are costly for some smaller grinding rollers. Furthermore, the lifespans of the two bearings differ significantly; generally, the bearing closer to the larger end of the roller fails first, and the resulting impurities enter the other bearing, causing its failure and leading to waste.

[0003] CN201910501348.1 proposes a new configuration structure for grinding roller bearings, which uses a "double-row tapered roller bearing + cylindrical bearing" configuration. This configuration is very suitable for grinding rollers that bear high roller pressure, but its cost is relatively high for grinding rollers that bear low roller pressure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a grinding roller device for vertical roller mills and an installation method for adjusting shims thereon, so as to improve the service life of grinding roller bearings and reduce the cost of grinding rollers.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a grinding roller device for a vertical roller mill, comprising a grinding roller shaft, bearings, a hub, a roller sleeve, a clamping assembly, and a sealing assembly. Two single-row tapered bearings are provided between the grinding roller shaft and the hub. The end of the grinding roller shaft is provided with an adjusting shim for adjusting the bearing clearance and a shaft end pressure plate. The shaft end pressure plate is provided with a sensor for detecting the temperature and vibration of the grinding roller. The roller sleeve is fixed to the outside of the hub by the clamping assembly. The sealing assembly is installed between the hub and the rocker arm. The sealing assembly includes a through cover, a bushing, two oil seals, and a sealing frame. The through cover contains two oil seals. The oil seal lip near the bearing for oil prevention faces inward, and the oil seal lip near the outside for dust prevention faces outward. The bushing is fitted on the grinding roller shaft, and the two oil seals are in contact with the bushing. The sealing frame is installed on the rocker arm and has an air inlet hole. The part of the sealing frame near the through cover has a rigid sealing ring, and the sealing ring and the through cover form an annular gap of 1-3 mm.

[0006] The two single-row tapered bearings include a large single-row tapered bearing and a small single-row tapered bearing, which are installed back to back. The large single-row tapered bearing is located at the large end of the grinding roller, and the small single-row tapered bearing is located at the small end of the grinding roller.

[0007] The hub has a conical surface and a cylindrical surface on the outside. The cone angle of the conical surface is 15°-25°. A U-shaped groove is provided between the conical surface and the cylindrical surface. The hub also has a groove inside. The hole in the hub where the bearing is installed has a first stop and a second stop for positioning, which are used for axial positioning of the outer ring of the single-row tapered bearing, respectively.

[0008] The roller sleeve is fixed to the outside of the hub by a clamping assembly, which includes a pressure ring, a double-ended stud, and a nut. The conical surface of the pressure ring and the conical surface of the roller sleeve are combined and fixed by the double-ended stud. The nut is provided with a protective sleeve. The roller sleeve is shaped as a conical roller, a tire roller, or a cylindrical roller.

[0009] The sensor is a temperature and vibration integrated sensor, which is installed on the inner hole plane of the shaft end pressure plate.

[0010] A horn sleeve is installed on the end face of the hub. The horn sleeve has a split structure and a material leakage hole, so that the material entering the horn sleeve can be discharged through the material leakage hole, thereby reducing the wear of dust on the hub.

[0011] A glycerin hole is provided at the oil seal position on the grinding roller shaft; a vent hole for ventilation and placement of sensor wires is also provided along the axial direction of the grinding roller shaft.

[0012] The thickness of the adjusting shim is 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft and the end plate.

[0013] A method for installing adjusting shims in the above-mentioned grinding roller device for a vertical roller mill involves installing the inner ring of a small single-row tapered bearing onto the grinding roller shaft, removing the shaft end pressure plate and tightening the bolts to ensure the bearing is in place; removing the shaft end pressure plate, measuring the height difference between the end face of the grinding roller shaft and the end face of the inner ring of the single-row tapered bearing, installing a set of adjusting shims onto the end face of the grinding roller shaft, wherein the thickness of the adjusting shims is 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft and the shaft end pressure plate, installing the shaft end pressure plate, and tightening the bolts.

[0014] The beneficial effects of this invention are: it solves the problems of high cost and large difference in the lifespan of the two bearings, optimizes the bearing configuration of the grinding roller, adopts a configuration of two single-row tapered bearings, so that the lifespan of the two bearings is basically equal, and sets up online vibration monitoring of the grinding roller to monitor the bearing status in real time, thereby improving the service life of the grinding roller bearings, avoiding waste, and reducing the cost of the grinding roller device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the grinding roller device of the present invention for use in vertical roller mills;

[0016] Figure 2 This is a schematic diagram of the shaft end pressure plate.

[0017] Figure 3This is a diagram showing the sensor installation;

[0018] Figure 4 This is a detailed drawing of the oil seal area;

[0019] In the diagram: 1. Hub, 1a. Conical surface, 1b. Cylindrical surface, 1c. Cone angle, 1d. First stop, 1e. Second stop, 2. Roller sleeve, 3. Double-ended stud, 4. Pressure ring, 5. Nut, 6. Protective sleeve, 7. Small single-row tapered bearing, 8. Grinding roller shaft, 8a. Oil inlet, 8b. Glycerin hole, 8c. Vent hole, 8d. Oil return hole, 9. Temperature and vibration integrated sensor, 10. Adjusting shim, 11. Shaft end pressure plate, 12. Horn sleeve, 12a. Material leakage hole, 13. Large single-row tapered bearing, 14. Through cover, 15. Sealing frame, 15a. Air inlet, 15b. Sealing ring, 16. Oil seal, 17. Bushing, 18. Oil inlet pipe, 19. Oil return pipe, 20. Vent pipe, 21. Rocker arm. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figure 1-4As shown, the grinding roller device for a vertical roller mill of the present invention includes a grinding roller shaft 8, bearings, a hub 1, a roller sleeve 2, a clamping assembly, and a sealing assembly. Two single-row tapered bearings are provided between the grinding roller shaft 8 and the hub 1. The end of the grinding roller shaft 8 is provided with an adjusting shim 10 for adjusting the bearing clearance and a shaft end pressure plate 11. The shaft end pressure plate 11 is provided with a sensor 9 for detecting the temperature and vibration of the grinding roller. The roller sleeve 2 is fixed to the outside of the hub 1 by the clamping assembly. The sealing assembly is installed between the hub 1 and the rocker arm 21. The sealing assembly includes a transparent cover. 14. Bushing 17, two oil seals 16, sealing frame 15. The cover 14 contains two oil seals 16. The oil seal lip near the bearing for oil prevention faces inward, and the oil seal lip near the outside for dust prevention faces outward. Bushing 17 is fitted on the grinding roller shaft 8. The two oil seals 16 are in contact with bushing 17. Sealing frame 15 is mounted on rocker arm 21. Sealing frame 15 is provided with air inlet hole 15a. The part of sealing frame 15 near cover 14 is provided with rigid sealing ring 15b. Sealing ring 15b and cover 14 form an annular gap of 1-3mm.

[0024] The two single-row tapered bearings include a large single-row tapered bearing 13 and a small single-row tapered bearing 7, which are installed back to back. The large single-row tapered bearing 13 is located at the large end of the grinding roller, and the small single-row tapered bearing 7 is located at the small end of the grinding roller.

[0025] The hub 1 has a conical surface 1a and a cylindrical surface 1b on its outside. The cone angle of the conical surface 1a is 15°-25°. A U-shaped groove is provided between the conical surface 1a and the cylindrical surface 1b. The hub also has a groove inside. The hole at the bearing mounting position in the hub has a first stop 1d and a second stop 1e for positioning, which are used for axial positioning of the outer ring of the single-row tapered bearing, respectively.

[0026] The roller sleeve 2 is fixed to the outside of the hub 1 by a clamping assembly, which includes a pressure ring 4, a double-ended stud 3, and a nut 5. The conical surface of the pressure ring 4 and the conical surface of the roller sleeve 2 are combined and fixed by the double-ended stud 3. The nut 5 is provided with a protective sleeve 6. The shape of the roller sleeve 2 is a conical roller, a tire roller, or a cylindrical roller.

[0027] The sensor 9 is a temperature and vibration integrated sensor, which is installed on the inner hole plane of the shaft end pressure plate 11.

[0028] A horn sleeve 12 is installed on the end face of the hub. The horn sleeve 12 has a split structure and a material leakage hole 12a is provided on the horn sleeve 12 so that the material entering the horn sleeve can be discharged through the material leakage hole, thereby reducing the wear of dust on the hub.

[0029] A glycerin hole 8b is provided at the oil seal position on the grinding roller shaft 8; a vent hole 8c for ventilation and placement of sensor wires is also provided along the axial direction of the grinding roller shaft 8.

[0030] The thickness of the adjusting shim 10 is 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft 8 and the shaft end pressure plate 11.

[0031] The above-mentioned method for installing the adjusting shims of the grinding roller device for vertical roller mills involves installing the inner ring of the small single-row tapered bearing 7 onto the grinding roller shaft 8, removing the shaft end pressure plate 11 and tightening the bolts to ensure the bearing is in place; removing the shaft end pressure plate 11, measuring the height difference between the end face of the grinding roller shaft and the inner ring of the single-row tapered bearing, installing a set of adjusting shims 10 onto the end face of the grinding roller shaft 8, with the thickness of the adjusting shims 10 being 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft 8 and the shaft end pressure plate 11, installing the shaft end pressure plate 11, and tightening the bolts.

[0032] Specifically, this invention employs a sealing structure of "external airflow + two oil seals" to improve the service life of the oil seal 16. It features low manufacturing cost, excellent sealing effect, and extended service life of the grinding roller bearing, avoiding waste. The grinding roller bearing consists of two single-row tapered bearings of different sizes, installed back-to-back; the larger single-row tapered bearing 13 is located at the large end of the grinding roller, and the smaller single-row tapered bearing 7 is located at the small end of the grinding roller.

[0033] The hub 1 has a conical surface 1a and a cylindrical surface 1b on its outer side. The cone angle 1c of the conical surface is 15°-25°, and a U-shaped groove is provided between the two. The hub also has a groove inside, which improves the casting process of the hub. The bearing position hole of the hub has a locating stop 1d and a locating stop 1e, which are used for axial positioning of the outer ring of the tapered bearing. The outer ring of the larger single-row tapered bearing is positioned by the stop 1d of the hub, and the outer ring of the smaller single-row tapered bearing is positioned by the stop 1e of the hub.

[0034] The roller sleeve 2 is fixed to the outside of the hub 1 by a clamping assembly. The clamping assembly includes a pressure ring 4, a double-ended stud 3, and a nut 5; the conical surface of the pressure ring and the conical surface of the roller sleeve are engaged and fixed by the double-ended stud 3. The nut 5 is provided with a protective sleeve 6 to reduce the wear of the nut by dust inside the mill; the shape of the roller sleeve 2 can be a conical roller, a tire roller, or a cylindrical roller.

[0035] The front end of the grinding roller shaft 8 is equipped with an adjusting shim 10 and a shaft end pressure plate 11. The bearing clearance is adjusted by adjusting the thickness of the adjusting shim 10 to avoid premature bearing failure due to excessive tightness or looseness, thus maximizing the lifespan of the grinding roller bearing. The specific method is as follows: Install the inner ring of the small single-row tapered bearing 7 onto the grinding roller shaft 8, remove the shaft end pressure plate 11 and tighten the bolts to ensure the bearing is in place; remove the shaft end pressure plate 11, measure the height difference between the end face of the grinding roller shaft and the inner ring of the single-row tapered bearing, and install a set of adjusting shims 11 with a thickness less than the height difference by 0 to 0.05 mm onto the end face of the grinding roller shaft 8; install the shaft end pressure plate 11 and tighten the bolts.

[0036] The inner hole of the shaft end pressure plate 11 has a flat surface, on which a temperature and vibration integrated sensor 9 is installed to detect the temperature and vibration of the grinding roller, facilitating real-time diagnosis of the grinding roller bearing. The horn sleeve 12 has a split structure for easy replacement and is provided with a material leakage hole 12a so that materials entering the horn sleeve can exit through the material leakage hole; it is fixed to the end face of the hub 1 by bolts to protect the hub and reduce dust wear on the hub.

[0037] The cover 14 contains two skeleton oil seals 16. The lip of the oil seal 16 closer to the bearing 13 faces inward to prevent oil, while the lip of the oil seal closer to the outside faces outward to prevent dust. The grinding roller shaft 8 is provided with a bushing 17, which is made of bearing steel. The oil seal 16 contacts the bushing 17, thus avoiding direct contact between the oil seal 16 and the roller shaft 8, which would cause the seal to fail due to wear of the roller shaft.

[0038] A glycerin hole 8b is provided at the oil seal location on the grinding roller shaft 8. Regularly injecting glycerin into the glycerin hole 8b can ensure good lubrication of the oil seal and improve its service life. The grinding roller bearing adopts forced lubrication by a thin oil station. The lubricating oil enters the grinding roller bearing cavity from the oil inlet pipe 18 and the oil inlet hole 8a, and returns to the thin oil station from the oil return hole 8d and the oil return pipe 19. A vent hole 8c is provided on the grinding roller shaft. The vent hole is used for ventilation and also for placing the sensor wire. A vent cap 20 is provided on the vent hole 8a to filter moisture and impurities from the air.

[0039] The sealing frame 15 is provided with an air inlet 15a and a rigid sealing ring 15b, forming an annular gap of 1-3mm with the through cover 14.

[0040] The negative pressure inside the mill ensures that a certain amount of external air enters the mill through the annular gap, thus separating the dust inside the mill from the oil seal; the sealing fan is eliminated, saving costs.

[0041] In summary, this invention solves the problems of high cost and large difference in the lifespan of the two bearings. It optimizes the bearing configuration method and structure of the grinding roller, adopts a configuration of two single-row tapered bearings, so that the lifespan of the two bearings is basically equal, and online vibration monitoring of the grinding roller is set up to monitor the bearing status in real time, thereby improving the service life of the grinding roller bearings, avoiding waste, and reducing the cost of the grinding roller device.

[0042] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The patent scope of the present invention should not be limited by these embodiments. That is, all equivalent changes or modifications made in accordance with the spirit of the present invention still fall within the patent scope of the present invention.

Claims

1. A grinding roller assembly for a vertical roller mill, comprising a grinding roller shaft (8), bearings, a hub (1), a roller sleeve (2), a clamping assembly, and a sealing assembly, characterized in that, Two single-row tapered bearings are provided between the grinding roller shaft (8) and the hub (1). The two single-row tapered bearings include a large single-row tapered bearing (13) and a small single-row tapered bearing (7). They are installed back to back. The large single-row tapered bearing (13) is located at the large end of the grinding roller, and the small single-row tapered bearing (7) is located at the small end of the grinding roller. The end of the grinding roller shaft (8) is provided with an adjusting shim (10) and a shaft end pressure plate (11) for adjusting the bearing clearance. The thickness of the adjusting shim (10) is 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft (8) and the shaft end pressure plate (11). The shaft end pressure plate (11) is provided with a sensor (9) for detecting the temperature and vibration of the grinding roller. The roller sleeve (2) is fixed to the hub (1) by a clamping assembly. On the outside, the sealing assembly is installed between the hub (1) and the rocker arm (21). The sealing assembly includes a cover (14), a bushing (17), two oil seals (16), and a sealing frame (15). The cover (14) contains two oil seals (16). The lip of the oil seal near the bearing for oil prevention faces inward, and the lip of the oil seal near the outside for dust prevention faces outward. The bushing (17) is fitted on the grinding roller shaft (8). The two oil seals (16) are in contact with the bushing (17). The sealing frame (15) is installed on the rocker arm (21). The sealing frame (15) is provided with an air inlet (15a). The part of the sealing frame (15) near the cover (14) is provided with a rigid sealing ring (15b). The sealing ring (15b) and the cover (14) form an annular gap of 1-3mm.

2. The grinding roller device for a vertical roller mill according to claim 1, characterized in that, The hub (1) has a conical surface (1a) and a cylindrical surface (1b) on its outside. The cone angle of the conical surface (1a) is 15°-25°. A U-shaped groove is provided between the conical surface (1a) and the cylindrical surface (1b). The hub also has a groove inside. The hole at the bearing mounting position in the hub has a first stop (1d) and a second stop (1e) for positioning, which are used for axial positioning of the outer ring of the single-row tapered bearing, respectively.

3. The grinding roller device for a vertical roller mill according to claim 1, characterized in that, The roller sleeve (2) is fixed to the outside of the hub (1) by a clamping assembly. The clamping assembly includes a pressure ring (4), a double-ended stud (3), and a nut (5). The conical surface of the pressure ring (4) and the conical surface of the roller sleeve (2) are combined and fixed by the double-ended stud (3). The nut (5) is provided with a protective sleeve (6). The shape of the roller sleeve (2) is a conical roller, a tire roller, or a cylindrical roller.

4. The grinding roller device for a vertical roller mill according to claim 1, characterized in that, The sensor (9) is a temperature and vibration integrated sensor, which is set on the inner hole plane of the shaft end pressure plate (11).

5. The grinding roller device for a vertical roller mill according to claim 1, characterized in that, A horn sleeve (12) is installed on the end face of the hub. The horn sleeve (12) has a split structure and a material leakage hole (12a) is provided on the horn sleeve (12) so that the material entering the horn sleeve can be discharged from the material leakage hole, thereby reducing the wear of dust on the hub.

6. The grinding roller device for a vertical roller mill according to claim 1, characterized in that, A glycerin hole (8b) is provided at the oil seal position on the grinding roller shaft (8); a vent hole (8c) for ventilation and placement of sensor wires is also provided along the axial direction of the grinding roller shaft (8).

7. A method for installing the adjusting shims of the grinding roller device for a vertical roller mill as described in claim 1, characterized in that, Install the inner ring of the small single-row tapered bearing (7) onto the grinding roller shaft (8), remove the shaft end pressure plate (11) and tighten the bolts to make the bearing installed in place; remove the shaft end pressure plate (11), measure the height difference between the end of the grinding roller shaft and the end face of the inner ring of the single-row tapered bearing, install a set of adjusting shims (10) on the end face of the grinding roller shaft (8), the thickness of the adjusting shims (10) is 0 to 0.05 mm smaller than the gap between the end face of the grinding roller shaft (8) and the shaft end pressure plate (11), install the shaft end pressure plate (11) and tighten the bolts.

Images