Power system of vertical roller mill

Abstract

The utility model relates to a power system of a vertical roller mill in the field of vertical roller mills. The power system comprises a main shell, a planetary reducer and a permanent magnet synchronous motor, wherein the planetary reducer and the permanent magnet synchronous motor are arranged in the main shell; the planetary reducer comprises a horizontally-arranged inner gear ring, a planet gear meshed with the inner ring of the inner gear ring, a sun gear meshed with the planet gear and a planet carrier fixed to a planet gear shaft, the planet carrier is connected with an output flange, the sun gear and the inner gear ring are coaxially arranged, and the axis part of the sun gear vertically extends outwards to form a power input end of the sun gear; a motor rotor of the permanent magnet synchronous motor is fixedly connected with a motor output shaft, the motor output shaft is arranged between the motor rotor and the power input end of the sun gear, and the motor output shaft is connected with the power input end of the sun gear and drives the sun gear to rotate horizontally. A multi-stage planetary reducer is optimized into a one-stage planetary reducer, so that the transmission efficiency is higher, and energy conservation and emission reduction are realized; and only one stage of planetary reducer is left in the gear transmission part, the motor rotor is directly connected with the sun gear through the motor output shaft, a traditional coupler is not needed, the size of the whole machine is smaller, and the installation space is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical roller mills, in particular to a power system of a vertical roller mill. Background Art

[0002] Vertical roller mills are widely used in production industries such as cement and coal. The vertical mill power system is a key power driving device in the vertical roller mill. Currently, the traditional vertical mill power system consists of a high-voltage asynchronous motor, a coupling, a vertical mill reducer, and a lubrication device. Among them, the vertical mill reducer, as the main transmission structure in the system, is composed of a bevel gear train and a multi-stage planetary reducer. After being connected to the high-voltage asynchronous motor and the coupling, it realizes speed reduction transmission.

[0003] Regarding the above related technologies, the inventor believes that the overall structure of the vertical mill power system is relatively complex, and the motor and the reducer in the transmission drive system are in series, and the efficiency is the product of the two. Therefore, the overall transmission efficiency is very low, and the asynchronous motor has a relatively low power factor and efficiency due to the need for excitation on the stator winding side, which makes the traditional drive system consume a relatively high amount of energy.

[0004] Therefore, during the process of connecting the vertical mill reducer with the high-voltage asynchronous motor and the coupling for transmission, there are problems such as low transmission efficiency, high energy consumption, and relatively high failure rate. And when installing and using the power system, it is necessary to connect equipment such as the vertical mill reducer, the motor, and the coupling. The entire power system occupies a relatively large installation space. Content of the Utility Model

[0005] The problem to be solved by the utility model is how to reduce the energy consumption and installation space of the power system of the vertical roller mill.

[0006] In order to achieve the above utility model purpose, the utility model provides a power system of a vertical roller mill, and it adopts the following technical scheme:

[0007] A power system of a vertical roller mill includes a total housing, a planetary reducer and a permanent magnet synchronous motor arranged inside the total housing; the planetary reducer includes an internally toothed ring arranged horizontally, planetary gears meshing with the inner ring of the internally toothed ring, a sun gear meshing with the planetary gears, and a planetary carrier fixed to the planetary gear shaft. The planetary carrier is connected with an output flange. The sun gear and the internally toothed ring are coaxially arranged. A power input end of the sun gear is vertically and outwardly extended and formed at the axial center part of the sun gear; the motor rotor of the permanent magnet synchronous motor is fixedly connected with a motor output shaft. The motor output shaft is arranged between the motor rotor and the power input end of the sun gear. The motor output shaft is connected with the power input end of the sun gear and drives the sun gear to rotate horizontally.

[0008] By adopting the above technical solution, the start of the permanent magnet synchronous motor is controlled, and the motor rotor of the permanent magnet synchronous motor rotates. The power input end of the motor output shaft is connected to the sun gear to transfer torque to the sun gear. The sun gear serves as the power input end of the planetary reducer, and can transfer power to the planet carrier, and finally transfer the reduced speed and increased torque to the output flange.

[0009] The permanent magnet synchronous motor is adopted to replace the traditional high-voltage asynchronous motor. The gear transmission structure is optimized from the multi-stage planetary reducer of the traditional vertical roller mill gearbox to a single-stage planetary reducer, with higher transmission efficiency. The comprehensive power saving rate can reach 5-15%. Under the load of at least 20%, the motor efficiency can still be maintained above 90%, thus significantly improving the transmission efficiency of the vertical mill power system, reducing energy consumption, and achieving energy conservation and emission reduction. Compared with the traditional vertical reducer, only a single-stage planetary reducer remains in the gear transmission part of the present invention, and the multi-stage planetary reducer and the bevel gear system for changing the transmission direction are no longer designed. The motor rotor is directly connected to the sun gear through the motor output shaft, without the need for a traditional coupling. The overall volume of the machine is smaller, and it can replace the original foundation of the traditional vertical mill reducer, saving installation space.

[0010] Moreover, the torque transmission path between the motor rotor and the sun gear is segmented and transmitted through the short drive shaft at the power input end of the motor output shaft and the sun gear, which can reduce the transmission loss caused by the increase in bending and torsion due to the too long length of the drive shaft, resulting in a decrease in power transmission efficiency, thereby further improving the power transmission efficiency and further reducing energy consumption; and decomposing the drive shaft into the combined transmission of two short drive shafts at the power input end of the motor output shaft and the sun gear can avoid the bending, vibration and fatigue fracture during the transmission of the long drive shaft, thereby improving the reliability of the transmission process.

[0011] Optionally, a boss is provided at one end of the motor output shaft, and the end face stop of the motor rotor is inserted and matched with the boss of the motor output shaft and fixed by bolts.

[0012] By adopting the above technical solution, through the cooperation between the end face stop of the motor rotor and the boss of the motor output shaft, the radial positioning of the motor rotor and the motor output shaft is realized, and then fixed and connected by bolts, which can make the motor rotor and the motor output shaft accurately positioned and fixed, thereby reducing the transmission loss during torque transmission.

[0013] Optionally, an inner housing is provided inside the total housing. The power input end of the sun gear and the motor output shaft are both coaxially located in the hollow channel of the inner housing, and a combined bearing is provided between the outer circular surface of the inner housing and the motor output shaft.

[0014] By adopting the above technical solutions, the motor rotor is arranged outside the inner housing, the motor output shaft is arranged inside the inner housing, and the rotation of the motor output shaft is stably guided by the combined bearing, making the rotation of the motor output shaft smoother and the torque transmission efficiency higher. Moreover, the inner housing, the combined bearing and the motor output shaft cooperate to form a cantilever support structure for the motor rotor, making the power transmission between the electronic rotor and the sun gear more stable.

[0015] Optionally, a limiting boss is provided on the outer circumferential surface of the motor output shaft, one end of the combined bearing is placed on the limiting boss, the other end of the combined bearing is fixedly installed on the motor output shaft through a locking bolt, and a spacer sleeve for providing support between the bearing seats of the combined bearing is arranged inside the combined bearing.

[0016] By adopting the above technical solutions, the locking bolt and the limiting boss limit and support the combined bearing, and the spacer sleeve provides support for the bearing seats of the combined bearing, so that the combined bearing is stably fixedly installed between the inner housing and the motor output shaft, thereby stably guiding the rotation of the motor output shaft relative to the inner housing.

[0017] Optionally, an annular sealing end cover is fixedly provided at the lower edge of the inner housing, the motor output shaft passes through the annular sealing end cover, and a skeleton oil seal is arranged between the motor output shaft and the annular sealing end cover.

[0018] By adopting the above technical solutions, the annular sealing end cover supports the installation of the skeleton oil seal, and the annular sealing end cover and the skeleton oil seal cooperate to seal the lubricating oil at the planetary reducer and the combined bearing, so as to prevent the lubricating oil from splashing into the permanent magnet synchronous motor, resulting in potential safety hazards and affecting the heat dissipation performance and operation efficiency of the motor, etc.

[0019] Optionally, the total housing includes an upper housing and a lower housing that are fixedly connected to each other and have a communicating cavity. The planetary reducer is arranged in the upper housing, the permanent magnet synchronous motor is arranged in the lower housing. An upper housing base is arranged between the upper housing and the lower housing. The internal gear ring is fixedly arranged on the upper housing base. The planet carrier and the planet wheel shaft are both rotatably connected to the upper housing base. The upper housing base is provided with a circular communication port, and the inner housing is formed by vertically extending downward from the edge of the communication port.

[0020] By adopting the above technical solutions, the planetary reducer and the permanent magnet synchronous motor are respectively installed by the upper housing and the lower housing, and the inner housing and the upper housing base are integrated into one body, simultaneously supporting parts such as the motor output shaft, the combined bearing, the internal gear ring and the planet carrier, reducing the number of parts, improving the integration degree, and further saving the installation space.

[0021] Optionally, the upper end of the upper housing is open, the output flange is placed on the upper end of the upper housing, a thrust bearing and a thrust block are arranged between the output flange and the base of the upper housing, and the output flange, the thrust bearing, the thrust block and the base of the upper housing are mutually attached from top to bottom.

[0022] By adopting the above technical solution, after the external vertical dynamic and static loads are transmitted to the output flange, they act on the thrust block through the support of the thrust bearing, and the thrust block is transmitted to the base of the upper housing, and finally transmitted to the foundation through the lower housing, so as to reduce the axial loads on the output flange, the planet carrier, the upper housing and the lower housing, thereby reducing the losses of each component of the vertical power system and improving the service life. The planetary reducer is designed inside the inner circles of the thrust bearing and the thrust block, reducing the height dimension of the upper housing and making the whole structure more compact.

[0023] Optionally, it further includes a slow drive maintenance device, a frequency converter and a lubrication system. The frequency converter is electrically connected to the permanent magnet synchronous motor, and the pipeline of the lubrication system is communicated with the planetary reducer; a slow drive gear ring is fixedly arranged on the outer edge of the output flange, and the slow drive pinion of the slow drive maintenance device meshes with the slow drive gear ring.

[0024] By adopting the above technical solution, an external slow drive maintenance device is used to drive the slow drive gear ring on the output flange to rotate through the slow drive pinion for low-speed driving during maintenance. The output flange and the large gear ring are integrated and do not need to be connected by bolts, reducing costs; driven by a frequency converter, it can still drive smoothly under working conditions with low load and large load fluctuations, and the intelligent control can adjust the output speed to a reasonable range according to the change of load production.

[0025] In summary, the utility model includes at least one of the following beneficial technical effects:

[0026] 1. Using a permanent magnet synchronous motor to replace the traditional high-voltage asynchronous motor, the gear transmission structure is optimized from the multi-stage planetary reducer of the traditional vertical mill gearbox to a single-stage planetary reducer, with higher transmission efficiency. The comprehensive power saving rate can reach 5-15%, and at a load of at least 20%, the motor efficiency can still be maintained above 90%, thus significantly improving the transmission efficiency of the vertical mill power system, reducing energy consumption, and achieving energy conservation and emission reduction.

[0027] 2. Compared with the traditional vertical reducer, only a single-stage planetary reducer remains in the gear transmission part of the present invention. The multi-stage planetary reducer and the bevel gear system for changing the transmission direction are no longer designed. The motor rotor is directly connected to the sun gear through the motor output shaft, without the need for a traditional coupling. The whole machine is smaller in size and can replace the original foundation of the traditional vertical mill reducer, saving installation space.

[0028] 3. By using short drive shafts to segmentally transmit the torque transmission path between the motor rotor and the sun gear through the power input end of the motor output shaft and the sun gear, it is possible to reduce the transmission losses caused by the increase in bending and torsion due to the excessive length of the drive shaft, which leads to a decrease in power transmission efficiency. This further improves the power transmission efficiency and further reduces energy consumption. Moreover, by decomposing the drive shaft into a combined drive of two short drive shafts, namely the power input end of the motor output shaft and the sun gear, it is possible to avoid the bending, vibration, and fatigue fracture that occur during the transmission of a long drive shaft, thereby enhancing the reliability of the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an overall schematic diagram of the power system of a vertical roller mill of the present utility model.

[0030] Figure 2 is a schematic structural diagram of the general housing, planetary reducer, and permanent magnet synchronous motor of the power system of a vertical roller mill of the present utility model.

[0031] DESCRIPTION OF THE REFERENCE NUMERALS: 1, slow drive maintenance device; 1-1, slow drive pinion; 2, lubrication system; 3, frequency converter; 4, planetary reducer; 4-1, internal gear ring; 4-2, planetary gear; 4-3, rolling bearing; 4-4, sun gear; 4-5, planetary carrier; 4-6, sliding bearing; 5, permanent magnet synchronous motor; 5-1, motor rotor; 5-2, motor stator; 6, output flange; 6-1, slow drive gear ring; 7, thrust bearing; 8, fixing bolt; 9, thrust block; 10, upper housing; 11, housing base; 12, stiffening rib; 13, skeleton oil seal; 14, lower housing; 15, locking bolt; 16, combined bearing; 17, motor output shaft; 18, spacer sleeve; 19, inner housing; 20, annular sealing end cover; 21, housing liquid cooling cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will further elaborate on the present utility model with reference to the Figure 1-2 drawings.

[0033] An embodiment of the present utility model discloses a power system for a vertical roller mill. Referring to Figure 1 and Figure 2 , the power system of the vertical roller mill includes a permanent magnet synchronous motor 5, a planetary reducer 4, a slow drive maintenance device 1, a frequency converter 3, and a lubrication system 2. The permanent magnet synchronous motor 5 and the planetary reducer 4 are integrally installed through the general housing. The power input end of the planetary reducer 4 is connected to the power output end of the permanent magnet synchronous motor 5, and the power output end of the planetary reducer 4 is connected with an output flange 6.

[0034] Referring to Figure 1, the slow drive maintenance device 1, the frequency converter 3, and the lubrication system 2 are all externally placed on the main housing. The frequency converter 3 is electrically connected to the permanent magnet synchronous motor 5, and the lubrication system 2 is connected to the planetary reducer 4 through pipelines. A slow drive gear ring 6-1 is fixedly arranged on the outer edge of the output flange 6, and the slow drive pinion 1-1 of the slow drive maintenance device 1 meshes with the slow drive gear ring 6-1. The slow drive maintenance device 1 drives the slow drive gear ring 6-1 on the output flange 6 to rotate through the slow drive pinion 1-1, which is used for low-speed driving during maintenance. The output flange 6 and the slow drive gear ring 6-1 are integrated and do not need to be connected by bolts, reducing costs. Driven by the frequency converter 3, it can still transmit smoothly under working conditions with low load and large load fluctuations. The intelligent control can adjust the output speed to a reasonable range according to the change of load production.

[0035] Refer to Figure 2 , the main housing includes an upper housing 10 and a lower housing 14. The lower housing 14 is in a hollow cylindrical shape with a vertical axis and has an upper opening. The upper housing is in a cylindrical structure and has the same central axis as the lower housing 14. A base of the upper housing 10 is fixedly connected to the lower edge of the lower opening of the upper housing 10, and the base of the upper housing 10 is bolted to the upper opening edge of the lower housing 14. A circular communication port is provided on the base of the upper housing 10, and the upper housing 10 and the lower housing 14 are communicated with each other. The output flange 6 is placed on the upper opening edge of the upper housing 10, and the output flange 6 is in a horizontal state.

[0036] Refer to Figure 2 , the motor stator 5-2 of the permanent magnet synchronous motor 5 is installed inside the lower housing 14 and has the same central axis as the lower housing 14. The motor stator 5-2 is provided with a motor rotor 5-1 through the action of a magnetic conduction coil, and a motor output shaft 17 is arranged inside the inner ring of the motor rotor 5-1. A housing liquid cooling cavity 21 is provided on the wall of the lower housing 14, and a heat dissipation medium is filled in the housing liquid cooling cavity 21, which can dissipate heat and cool down the operating permanent magnet synchronous motor 5.

[0037] Refer to Figure 2 , the motor output shaft 17 is in a cylindrical shape, and a convex platform is provided on the lower end face of the motor output shaft 17. The end face stop of the motor rotor 5-1 is inserted and matched with the convex platform of the motor output shaft 17, and the end face of the motor rotor 5-1 and the motor output shaft 17 are fixed by bolts. A plurality of bolts are provided, and the plurality of bolts are spaced apart around the central axis of the motor rotor 5-1. Through the cooperation of the end face stop of the motor rotor 5-1 and the convex platform of the motor output shaft 17 to achieve radial positioning of the motor rotor 5-1 and the motor output shaft 17, and then fixed by bolts, the motor rotor 5-1 and the motor output shaft 17 can be accurately positioned and fixed.

[0038] Refer to Figure 2, the planetary reducer 4 includes an internal gear ring 4-1, planetary gears 4-2, a sun gear 4-4, and a planet carrier 4-5. A limit ring is provided at the base of the upper housing 10. The internal gear ring 4-1 is clamped and fixedly installed within the limit ring at the base of the upper housing 10, and the internal gear ring 4-1 is arranged concentrically with the motor output shaft 17. The sun gear 4-4 is located within the internal gear ring 4-1 and is arranged concentrically with the internal gear ring 4-1. The planetary gears 4-2 are simultaneously meshed with the inner ring of the internal gear ring 4-1 and the sun gear 4-4, and the meshing mode of its gear train is of the NGW type.

[0039] Refer to Figure 2 , a wheel shaft passes through the planetary gear 4-2 concentrically. The planetary gear 4-2 is rotatably connected to the wheel shaft through a rolling bearing 4-3, and the planet carrier 4-5 is fixedly connected to the wheel shaft. The upper end surface of the planet carrier 4-5 is connected to the output flange 6 through a fixing bolt 8. The lower edges of the planet carrier 4-5 and the wheel shaft of the planetary gear 4-2 are located in the same plane, and a sliding bearing 46 is provided between the lower edges of the planet carrier 4-5 and the wheel shaft of the planetary gear 4-2 and the base of the upper housing 10. The planet carrier 4-5 and the wheel shaft of the planetary gear 4-2 are arranged on the base of the upper housing 10 through the sliding bearing 46, so that the planet carrier 4-5 and the wheel shaft of the planetary gear 4-2 can slide relative to the base of the upper housing 10 and be radially limited, and the rotation of the planet carrier 4-5 and the wheel shaft of the planetary gear 4-2 relative to the base of the upper housing 10 is smoother and more stable.

[0040] Refer to Figure 2 , a power input end of the sun gear 4-4 vertically extends downward at the axial center part of the sun gear 4-4. The power input end of the sun gear 4-4 is arranged concentrically with the motor output shaft 17. External splines are provided on the power input end of the sun gear 4-4, and a concave part is provided on the upper end surface of the motor output shaft 17 and internal splines are provided. The power input end of the sun gear 4-4 is inserted into the concave part of the motor output shaft 17 and is spline-connected to the motor output shaft 17.

[0041] Control the permanent magnet synchronous motor 5 to start. The motor rotor 5-1 of the permanent magnet synchronous motor 5 rotates, and is connected through the motor output shaft 17 and the power input end of the sun gear 4-4 to realize the transmission of torque to the sun gear 4-4. The sun gear 4-4 serves as the power input end of the planetary reducer 4 and can transmit power to the planet carrier 4-5, and finally transmit the reduced speed and increased torque to the output flange 6.

[0042] The permanent magnet synchronous motor 5 is adopted to replace the traditional high-voltage asynchronous motor. The gear transmission structure is optimized from the multi-stage planetary reducer 4 of the traditional vertical roller mill gearbox to a single-stage planetary reducer 4, with higher transmission efficiency. The comprehensive power saving rate can reach 5-15%. Under a load of at least 20%, the motor efficiency can still be maintained above 90%, thus significantly improving the transmission efficiency of the vertical mill power system, reducing energy consumption, and achieving energy conservation and emission reduction. Compared with the traditional vertical reducer, only a single-stage planetary reducer 4 remains in the gear transmission part of the present invention. The multi-stage planetary reducer 4 and the bevel gear system for changing the transmission direction are no longer designed. The motor rotor 5-1 is directly connected to the sun gear 4-4 through the motor output shaft 17 without the need for a traditional coupling. The overall volume of the machine is smaller, and it can replace the original foundation of the traditional vertical mill reducer. Moreover, the permanent magnet synchronous motor 5 and the planetary reducer 4 share the upper housing 10 and the lower housing 14, with a highly integrated structure, which can significantly save the installation space.

[0043] Furthermore, by performing short drive shaft segmented transmission on the torque transmission path between the motor rotor 5-1 and the power input end of the sun gear 4-4 through the motor output shaft 17, the transmission loss caused by the increase in bending and torsion due to the excessive length of the drive shaft can be reduced, thereby further improving the power transmission efficiency and further reducing energy consumption. And decomposing the drive shaft into the combined transmission of two short drive shafts at the power input ends of the motor output shaft 17 and the sun gear 4-4 can avoid the bending, vibration, and fatigue fracture during the transmission of the long drive shaft, thereby improving the reliability of the transmission process.

[0044] Referring to Figure 2 , in order to make the transmission process between the motor rotor 5-1 and the sun gear 4-4 more stable and further reduce the installation space of the whole machine, the edge of the communication port at the base of the upper housing 10 extends vertically downward to form an inner housing 19. The inner housing 19 is cylindrical, and reinforcing ribs 12 are circumferentially distributed on the outer circular surface of the inner housing 19. The power input end of the sun gear 4-4 and the motor output shaft 17 are both located in the hollow channel of the inner housing 19, and the power input end of the sun gear 4-4 and the motor output shaft 17 are both arranged concentrically with the inner housing 19. A combined bearing 16 is arranged between the outer circular surface of the inner housing 19 and the motor output shaft 17. The combined bearing 16 includes at least two rolling bearings 4-3, which is limited to two rolling bearings 4-3 in the embodiment of the present invention, and can be set to three, four, or more rolling bearings 4-3 in other embodiments of the present invention.

[0045] The motor rotor 5-1 is arranged outside the inner housing 19, and the motor output shaft 17 is arranged inside the inner housing 19. The rotation of the motor output shaft 17 is stably guided by the combined bearing 16, making the rotation of the motor output shaft 17 smoother and the torque transmission efficiency higher. Moreover, the inner housing 19, the combined bearing 16 and the motor output shaft 17 cooperate to form a cantilever support structure for the motor rotor 5-1, making the power transmission between the electronic rotor and the sun gear 4-4 more stable.

[0046] Referring to Figure 2 , in order to make the combined bearing 16 more stably guide the rotation of the motor output shaft 17 relative to the inner housing 19, a limiting boss is provided on the outer cylindrical surface of the motor output shaft 17, and the bearing seat of the lowermost rolling bearing 4-3 of the combined bearing 16 is placed on the limiting boss. A locking nut is sleeved on the motor output shaft 17, the locking nut abuts against the uppermost end of the combined bearing 16, the locking nut is penetrated and threadedly connected with a locking bolt 15, and the locking bolt 15 abuts against the motor output shaft 17. A spacer sleeve 18 is placed between the bearing seats of the two bearings of the combined bearing 16. The locking nut and the limiting boss limit and support the combined bearing 16, and the spacer sleeve 18 provides support for the bearing seats of the combined bearing 16, so that the combined bearing 16 is stably fixedly installed between the inner housing 19 and the motor output shaft 17, thereby stably guiding the rotation of the motor output shaft 17 relative to the inner housing 19.

[0047] Referring to Figure 2 , to prevent the lubricating oil in the planetary reducer 4 and the combined bearing 16 from splashing into the permanent magnet synchronous motor 5, an annular sealing end cover 20 is fixedly connected to the lower edge of the inner housing 19 by bolts. The motor output shaft 17 passes through the annular sealing end cover 20, and a skeleton oil seal 13 is provided between the motor output shaft 17 and the annular sealing end cover 20. The annular sealing end cover 20 supports the installation of the skeleton oil seal 13, and the annular sealing end cover 20 and the skeleton oil seal 13 cooperate to seal the lubricating oil at the planetary reducer 4 and the combined bearing 16 to prevent the lubricating oil from splashing into the permanent magnet synchronous motor 5, which may cause potential safety hazards and affect the heat dissipation performance and operation efficiency of the motor.

[0048] Referring to Figure 2, a thrust bearing 7 and a thrust block 9 are arranged between the output flange 6 and the base of the upper end housing 10. Both the thrust bearing 7 and the thrust block 9 are annular, and the internal gear ring 4-1 is located in the inner circles of the thrust bearing 7 and the thrust block 9. The output flange 6, the thrust bearing 7, the thrust block 9 and the base of the upper end housing 10 are arranged in mutual contact from top to bottom. After the external vertical dynamic and static loads are transmitted to the output flange 6, they are supported by the thrust bearing 7 and act on the thrust block 9, and the thrust block 9 transmits them to the base of the upper end housing 10, and finally are transmitted to the foundation through the lower end housing 14, so as to reduce the axial loads borne by the output flange 6, the planet carrier 4-5, as well as the upper end housing 10 and the lower end housing 14, thereby reducing the losses of each component of the vertical mill power system and improving the service life. The planetary reducer 4 is designed inside the inner circles of the thrust bearing 7 and the thrust block 9, reducing the height dimension of the upper end housing 10, making the whole structure more compact and reducing the overall height of the machine, further saving the installation space.

[0049] The implementation principle of the power system of a vertical roller mill according to an embodiment of the present invention is as follows: The lubrication system 2 operates, and the frequency conversion controller controls the permanent magnet synchronous motor 5 to start, driving the rotation of the motor output shaft 17. Through the spline connection of the power input end of the motor output shaft 17 and the sun gear 4-4, the torque is transmitted to the sun gear 4-4. The sun gear 4-4 serves as the power input end of the planetary reducer 4 and can transmit the power to the planet carrier 4-5, and finally the speed is reduced and the torque is increased and then transmitted to the output flange 6. At the same time, after the external vertical dynamic and static loads are transmitted to the output flange 6, they are supported by the thrust bearing 7 and act on the thrust block 9, and the thrust block 9 transmits them to the base of the upper end housing 10, and finally are transmitted to the foundation through the lower end housing 14.

[0050] And the frequency converter 3 realizes the precise control of the permanent magnet synchronous motor 5. When the system needs to be repaired, the permanent magnet synchronous motor 5 is turned off, and the slow drive repair device 1 drives the slow drive pinion 1-1 to engage with the slow drive gear ring 6-1 of the output flange 6 to drive the output flange 6 to rotate slowly for easy repair.

[0051] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A power system of a vertical roller mill, characterized in that: It includes a general housing, a planetary reducer (4) and a permanent magnet synchronous motor (5) arranged inside the general housing; the planetary reducer (4) includes a horizontally arranged internal gear ring (4-1), a planetary gear (4-2) meshing with the inner ring of the internal gear ring (4-1), a sun gear (4-4) meshing with the planetary gear (4-2), and a planet carrier (4-5) fixed to the axle of the planetary gear (4-2). The planet carrier (4-5) is connected with an output flange (6). The sun gear (4-4) and the internal gear ring (4-1) are coaxially arranged. A power input end of the sun gear (4-4) is vertically and outwardly extended and formed at the axial center part of the sun gear (4-4); a motor rotor (5-1) of the permanent magnet synchronous motor (5) is fixedly connected with a motor output shaft (17). The motor output shaft (17) is arranged between the motor rotor (5-1) and the power input end of the sun gear (4-4). The motor output shaft (17) is connected with the power input end of the sun gear (4-4) and drives the sun gear (4-4) to rotate horizontally.

2. The power system of a vertical roller mill according to claim 1, characterized in that: A boss is arranged at one end of the motor output shaft (17). An end face stop of the motor rotor (5-1) is inserted and matched with the boss of the motor output shaft (17) and fixed by bolts.

3. The power system of a vertical roller mill according to any one of claims 1 or 2, characterized in that: An inner housing (19) is arranged inside the general housing. The power input end of the sun gear (4-4) and the motor output shaft (17) are both coaxially located in the hollow channel of the inner housing (19). A combined bearing (16) is arranged between the outer circular surface of the inner housing (19) and the motor output shaft (17).

4. The power system of a vertical roller mill according to claim 3, characterized in that: A limiting boss is arranged on the outer circular surface of the motor output shaft (17). One end of the combined bearing (16) is placed on the limiting boss. The other end of the combined bearing (16) is fixedly installed on the motor output shaft (17) through a locking bolt (15). A spacer sleeve (18) for providing support between the bearing seats of the combined bearing (16) is arranged inside the combined bearing (16).

5. The power system of a vertical roller mill according to claim 3, characterized in that: An annular sealing end cover (20) is fixedly arranged at the lower edge of the inner housing (19). The motor output shaft (17) passes through the annular sealing end cover (20). A skeleton oil seal (13) is arranged between the motor output shaft (17) and the annular sealing end cover (20).

6. The power system of a vertical roller mill according to claim 3, characterized in that: The general housing includes an upper housing (10) and a lower housing (14) which are fixedly connected to each other and have communicating cavities. The planetary reducer (4) is arranged in the upper housing (10). The permanent magnet synchronous motor (5) is arranged in the lower housing (14). A base of the upper housing (10) is arranged between the upper housing (10) and the lower housing (14). The internal gear ring (4-1) is fixedly arranged on the base of the upper housing (10). The planet carrier (4-5) and the axles of the planetary gears (4-2) are both rotatably connected to the base of the upper housing (10). A circular communication port is formed in the base of the upper housing (10). The inner housing (19) is formed by vertically extending downward from the edge of the communication port.

7. The power system of a vertical roller mill according to claim 6, characterized in that: The upper end of the upper housing (10) is open, the output flange (6) is placed on the upper end of the upper housing (10), a thrust bearing (7) and a thrust block (9) are arranged between the output flange (6) and the base of the upper housing (10), and the output flange (6), the thrust bearing (7), the thrust block (9) and the base of the upper housing (10) are mutually attached from top to bottom.

8. The power system of a vertical roller mill according to any one of claims 1 or 2, characterized in that: It further includes a slow drive maintenance device (1), a frequency converter (3) and a lubrication system (2). The frequency converter (3) is electrically connected to the permanent magnet synchronous motor (5), and the lubrication system (2) is connected to the planetary reducer (4) through pipelines; a slow drive gear ring (6-1) is fixedly arranged on the outer edge of the output flange (6), and the slow drive pinion (1-1) of the slow drive maintenance device (1) meshes with the slow drive gear ring (6-1).

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