Permanent magnet semi-direct driving force transmission system for vertical mill

Abstract

The utility model relates to a permanent magnet semi-direct drive power transmission system for a vertical mill in the field of semi-direct drive permanent magnet motors, which comprises a main shell, a planetary reducer and a permanent magnet synchronous motor, the planetary reducer comprises a horizontally-arranged inner gear ring, a planet gear meshed with 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, and the axis part of the sun gear perpendicularly extends outwards to form a connecting end of the sun gear. A motor rotor of the permanent magnet synchronous motor is fixedly provided with a motor rotor shaft, the connecting end portion of the sun gear penetrates through the motor rotor shaft with the same central axis, the motor rotor shaft is vertically fixed with a connecting end cover, and the connecting end cover is connected with the connecting end portion of the sun gear and drives the connecting end portion of the sun gear to rotate horizontally. A bevel gear train is omitted, a multi-stage planetary reducer is simplified into a one-stage planetary reducer, gear transmission loss is reduced, a traditional high-voltage asynchronous motor is replaced by the permanent magnet synchronous motor, transmission efficiency is improved, and energy consumption is reduced; the permanent magnet synchronous motor and the first-stage planetary reducer share the total shell, the connecting end of the sun gear is located in the motor rotor shaft, the structure is highly integrated, and the field installation space is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-direct-drive permanent magnet motors, in particular to a permanent magnet semi-direct-drive power transmission system for vertical mills. Background Art

[0002] Vertical roller mills are widely used in production industries such as cement and coal. The power system of the vertical mill is a key power driving device in the vertical roller mill. At present, the traditional power system of the vertical mill consists of four parts: 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 utility model person believes that the overall structure of the power system of the vertical mill 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, and the entire power system occupies a relatively large installation space. Summary 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 permanent magnet semi-direct-drive power transmission system for a vertical mill, and it adopts the following technical solutions:

[0007] A permanent magnet semi-direct-drive power transmission system for a vertical mill includes a general housing, a planetary reducer and a permanent magnet synchronous motor arranged inside the general 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 connecting end portion of the sun gear vertically extends outward from the axial center portion of the sun gear; a motor rotor shaft is fixedly arranged on the motor rotor of the permanent magnet synchronous motor. The connecting end portion of the sun gear passes through the motor rotor shaft coaxially, and a connecting end cover is vertically fixed on the motor rotor shaft. The connecting end cover is connected with the connecting end portion of the sun gear and drives the connecting end portion of the sun gear to rotate horizontally.

[0008] By adopting the above technical solution, the start of the permanent magnet synchronous motor is controlled to drive the rotation of the motor rotor shaft. The connecting end cover of the motor rotor shaft is connected to the connecting end of the sun gear to transfer torque to the sun gear. The sun gear serves as the power input end of the planetary reducer, capable of transmitting power to the planet carrier, and finally reducing the speed and increasing the torque before transmitting it to the output flange.

[0009] Compared with the traditional vertical mill gearbox, the gear transmission structure of the planetary reducer eliminates the bevel gear train and simplifies the multi-stage planetary reducer to a single-stage planetary reducer. The simplified planetary reducer can further reduce gear transmission losses, significantly improving the transmission efficiency of the vertical mill power system, thereby reducing energy consumption to achieve energy conservation, emission reduction, cost reduction, and efficiency improvement. Moreover, the permanent magnet synchronous motor replaces the traditional high-voltage asynchronous motor. The natural high power factor of the permanent magnet synchronous motor enables the power system of the present utility model to save 5-15% of energy comprehensively compared with the power system of the traditional vertical roller mill. At a load of at least 20%, the motor efficiency can still remain above 90%, further improving the transmission efficiency and reducing energy consumption. At the same time, the permanent magnet synchronous motor does not need to replace vulnerable parts such as slip rings and carbon brushes like the high-voltage asynchronous motor, and the use of a low-speed permanent magnet synchronous motor makes the single-stage planetary gearbox more reliable, effectively reducing the failure rate of the vertical mill power system.

[0010] The permanent magnet synchronous motor and the single-stage planetary reducer share the total housing, with a highly integrated structure. The connecting end of the sun gear is located inside the hollow motor rotor shaft of the motor, eliminating the traditional coupling and reducing the overall height dimension of the machine. Moreover, compared with the traditional vertical mill reducer, only the single-stage planetary reducer remains in the gear transmission part, further reducing the overall volume of the machine, enabling installation and replacement on the volume of the traditional vertical mill reducer. Compared with the traditional vertical mill power system, it does not require separate equipment such as a motor and a coupling, saving on-site installation space.

[0011] At the same time, the permanent magnet synchronous motor does not need to replace vulnerable parts such as slip rings and carbon brushes like the high-voltage asynchronous motor, and the use of a low-speed permanent magnet synchronous motor makes the single-stage planetary gearbox more reliable, effectively reducing the failure rate of the vertical mill power system.

[0012] Optionally, an internal housing is provided inside the total housing. The internal housing coaxially penetrates through the hollow motor rotor shaft of the permanent magnet synchronous motor. The connecting end of the sun gear coaxially penetrates through the hollow channel of the internal housing. The connecting end cover is located on the lower side of the internal housing and is fixedly connected to one end of the motor rotor shaft away from the planetary reducer. A combined bearing is provided between the outer circumferential surface of the internal housing and the motor rotor shaft.

[0013] By adopting the above technical solution, the inner housing is embedded in the hollow motor rotor shaft, and a combined bearing is arranged between the outer cylindrical surface of the inner housing and the motor rotor shaft, making the rotation of the motor rotor shaft relative to the inner housing more stable; and the above structure makes full use of the space between the inner housing and the motor rotor shaft, further reducing the overall height of the machine and reducing the installation space occupied by the vertical mill power system.

[0014] Optionally, a fixed end cover is bolted to the upper end surface of the motor rotor shaft. The fixed end cover abuts against one end of the combined bearing away from the connecting end cover. One end of the combined bearing close to the connecting end cover is fixedly installed on the inner housing through a locking bolt. A spacer sleeve for providing support between the bearing seats of the combined bearing is arranged inside the combined bearing.

[0015] By adopting the above technical solution, the locking bolt and the fixed end cover limit and support the combined bearing, and the spacer sleeve supports the bearing seats of the combined bearing, making the combined bearing stably and fixedly installed on the inner housing; at the same time, the fixed end cover, the connecting end cover and the combined bearing cooperate to form a cantilever support layout for the motor rotor of the permanent magnet synchronous motor, making the power transmission between the motor rotor shaft and the sun gear more stable. In addition, the spacer sleeve also has the function of adjusting the clearance of the combined bearing. By reducing the clearance of the combined bearing, sufficient rigidity is provided for the cantilever support, making the combined bearing more stably guide the rotation of the motor rotor shaft relative to the inner housing.

[0016] Optionally, a skeleton oil seal is arranged at the contact position between the fixed end cover and the combined bearing.

[0017] By adopting the above technical solution, it can prevent the oil in the lubricated combined bearing from splashing out, avoiding potential safety hazards caused by the lubricating oil to the structure of the permanent magnet synchronous motor and affecting the heat dissipation performance and operation efficiency of the motor.

[0018] Optionally, the connecting end cover is provided with an oil hole, and a skeleton oil seal is arranged between the connecting end cover and the shell wall of the total housing.

[0019] By adopting the above technical solution, after the lubricating oil flows through the internal oil path of the planetary reducer, it flows to the space between the oil baffle and the shell wall of the total housing through the oil hole of the connecting end cover, and the skeleton seal can prevent the oil from splashing into the permanent magnet synchronous motor.

[0020] Optionally, an oil retaining ring is arranged between the connecting end cover and the shell wall of the total housing. The skeleton oil seal is arranged between the oil retaining ring and the connecting end cover. An oil outlet is opened on the shell wall of the total housing corresponding to the oil guiding path of the oil retaining ring.

[0021] By adopting the above technical solution, after the lubricating oil passes through the internal oil circuit of the planetary reducer, it flows through the oil hole connecting the end cover to the space between the oil baffle and the wall of the total housing. The oil retaining ring and the skeleton seal prevent the oil from splashing into the permanent magnet synchronous motor. Then the lubricating oil flows out through the oil outlet after passing through the oil baffle, enters the lubrication system, and then enters the planetary reducer through the oil pump to complete the cycle, further realizing energy conservation and emission reduction.

[0022] Optionally, the sun gear is located above the motor rotor shaft. The connecting end cover is fixedly provided with a copper pad and a support pin. The connecting end of the sun gear abuts against the copper pad, and the support pin is inserted coaxially into the lower end face of the shaft of the sun gear.

[0023] By adopting the above technical solution, the extended connecting end of the sun gear is beneficial to the deformation and floating of the sun gear. Then, through the cooperation of the copper pad and the support pin with the connecting end of the sun gear, axial floating and support are further provided for the sun gear to achieve a better shock absorption effect.

[0024] 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. There is an upper housing base between the upper housing and the lower housing. The internal gear ring is fixedly arranged on the upper housing base, and the planetary carrier and the shafts of the planetary gears are both rotatably connected to the upper housing base.

[0025] By adopting the above technical solution, the planetary reducer and the permanent magnet synchronous motor are installed respectively through the upper housing and the lower housing, and the internal gear ring, the planetary carrier and the shafts of the planetary gears are installed through the upper housing base, which can more reasonably integrate and install the planetary reducer and the permanent magnet synchronous motor.

[0026] Optionally, the upper end of the upper housing is open. The output flange is placed on the upper end of the upper housing. There is a thrust bearing and a thrust block between the output flange and the upper housing base. The output flange, the thrust bearing, the thrust block and the upper housing base are mutually attached from top to bottom.

[0027] By adopting the above technical solution, after the external vertical dynamic and static loads are transmitted to the output flange, they are supported by the thrust bearing and act on the thrust block. The thrust block transmits to the upper housing base, and finally transmits to the foundation through the lower housing, so as to reduce the axial loads on the output flange, the planetary carrier, the upper housing and the lower housing, thereby reducing the losses of each component of the vertical mill power system, improving the service life, and further reducing costs and increasing efficiency.

[0028] Optionally, the lower edges of the planetary carrier and the shafts of the planetary gears are located in the same plane, and there is a sliding bearing between the lower edges of the planetary carrier and the shafts of the planetary gears and the upper housing base.

[0029] By adopting the above technical solution, the planet carrier and the planet wheel axle are carried on the upper housing through sliding bearings so as to be able to slide relative to the upper housing, and the rotation of the planet carrier and the planet wheel axle relative to the upper housing is made smoother and more stable, thereby further reducing the loss and failure rate in the power transmission process.

[0030] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0031] 1. The planetary reducer eliminates the bevel gear train and simplifies the multi-stage planetary reducer into a single-stage planetary reducer, which can further reduce the gear transmission loss, thereby significantly improving the transmission efficiency of the vertical mill power system, reducing energy consumption, achieving energy conservation, emission reduction, cost reduction and efficiency improvement; and the permanent magnet synchronous motor replaces the traditional high-voltage asynchronous motor. The natural high power factor of the permanent magnet synchronous motor enables the power system of the present utility model to save 5-15% of energy comprehensively compared with the power system of the traditional vertical roller mill. At a load of at least 20%, the motor efficiency can still be maintained above 90%, further improving the transmission efficiency and reducing energy consumption.

[0032] 2. The permanent magnet synchronous motor and the single-stage planetary reducer share the total housing, and the structure is highly integrated. The connecting end of the sun gear is located inside the motor rotor shaft, eliminating the traditional coupling and reducing the overall height dimension of the machine; and only the single-stage planetary reducer remains in the gear transmission part, further reducing the overall volume of the machine. It can be installed and replaced on the volume of the traditional vertical mill reducer. Compared with the traditional vertical mill power system, no separate motor and coupling and other equipment are required, saving the on-site installation space.

[0033] 3. The skeleton oil seals provided at the fixed end cover and the skeleton oil seals and oil retaining rings provided at the connecting end cover can effectively prevent the lubricating oil of the reducer from entering the motor interior, improving safety and reducing the failure rate. And the lubricating oil at the connecting end cover can flow out through the oil retaining ring and the lower housing from the oil hole and circulate through the lubrication system, further achieving energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the permanent magnet semi-direct drive power transmission system for the vertical mill of the present utility model.

[0035] Description of reference numerals: 1. Output flange; 2. Thrust bearing; 3. Planetary reducer; 3-1. Internal gear ring; 3-2. Planet gear; 3-3. Rolling bearing; 3-4. Sun gear; 3-5. Planet carrier; 4. Permanent magnet synchronous motor; 4-1. Motor rotor shaft; 4-2. Motor rotor; 4-3. Motor stator; 5. Fixed bolt; 6. Thrust block; 7. Upper housing; 8. Sliding bearing; 9. Upper housing base; 10. Fixed end cover; 11. Connecting end cover; 12. Lower housing; 13. Lower housing base; 14. Inner housing; 15. Skeleton seal; 16. Combined bearing; 17. Spacing sleeve; 18. Locking nut; 19. Support pin; 20. Copper gasket; 21. Oil baffle ring; 22. Oil outlet. Detailed implementation manners

[0036] The following further elaborates on the present utility model in conjunction with the attached Figure 1 drawings.

[0037] An embodiment of the present utility model discloses a permanent magnet semi-direct drive power transmission system for a vertical mill. Referring to Figure 1 , the permanent magnet semi-direct drive power transmission system for a vertical mill includes a permanent magnet synchronous motor 4, a planetary reducer 3, and an output flange 1. The power input end of the planetary reducer 3 is connected to the power output end of the permanent magnet synchronous motor 4, and the output flange 1 is connected to the power output end of the planetary reducer 3.

[0038] The permanent magnet synchronous motor 4 and the planetary reducer 3 are integrally installed through a total housing. The total housing includes an upper housing 7 and a lower housing 12. The lower housing 12 is in a hollow cylindrical structure and its axis is vertically arranged. The lower opening edge of the lower housing 12 is bolted with a lower housing base 13. The upper housing 7 is also in a hollow cylindrical structure and has the same central axis as the lower housing 12. The lower opening edge of the upper housing 7 is fixedly connected with an upper housing base 9, and the upper housing base 9 is bolted to the upper opening edge of the lower housing 12. The upper housing base 9 is provided with a communication port, and the upper housing 7 and the lower housing 12 are communicated with each other. The output flange 1 is placed on the upper opening edge of the upper housing 7, and the output flange 1 is in a horizontal state.

[0039] The motor stator 4-3 of the permanent magnet synchronous motor 4 is installed inside the lower housing 12 and has the same central axis as the lower housing 12. The motor stator 4-3 is provided with a motor rotor 4-2 through the action of a magnetic conduction coil. The hollow interior of the motor rotor 4-2 is provided with a motor rotor shaft 4-1. The motor rotor shaft 4-1 is in a hollow cylindrical shape and has the same central axis as the motor rotor 4-2. The motor rotor 4-2 is fixedly arranged on the outer cylindrical surface of the motor rotor shaft 4-1 through a flange structure and a reinforcing rib.

[0040] The planetary speed reducer 3 includes an internal gear ring 3-1, planetary gears 3-2, a sun gear 3-4, and a planet carrier 3-5. A limit ring is provided on the upper housing base 9. The internal gear ring 3-1 is clamped and fixedly installed within the limit ring of the upper housing base 9, and the internal gear ring 3-1 is arranged concentrically with the motor rotor shaft 4-1. The sun gear 3-4 is located within the internal gear ring 3-1 and is arranged concentrically with the internal gear ring 3-1. The planetary gears 3-2 are simultaneously meshed with the inner ring of the internal gear ring 3-1 and the sun gear 3-4, and the meshing mode of its gear train is of the NGW type.

[0041] A wheel shaft passes through the planetary gear 3-2 concentrically. The planetary gear 3-2 is rotatably connected to the wheel shaft through a rolling bearing 3-3, and the planet carrier 3-5 is fixedly connected to the wheel shaft. The upper end surface of the planet carrier 35 is connected to the output flange 1 through a fixing bolt 5. The lower edges of the planet carrier 3-5 and the wheel shaft of the planetary gear 3-2 are located in the same plane, and a sliding bearing 8 is provided between the lower edges of the planet carrier 3-5 and the wheel shaft of the planetary gear 3-2 and the upper housing base 9. The planet carrier 3-5 and the wheel shaft of the planetary gear 3-2 are arranged on the upper housing base 9 through the sliding bearing 8 so as to be able to slide relative to the upper housing base 9, and to make the rotation of the planet carrier 3-5 and the wheel shaft of the planetary gear 3-2 relative to the upper housing base 9 smoother and more stable.

[0042] The connecting end portion of the sun gear 3-4 is vertically extended downward from the axis center of the sun gear 3-4. The connecting end portion of the sun gear 3-4 passes through the motor rotor shaft 4-1 concentrically. A connecting end cover 11 is bolted to the lower edge of the motor rotor shaft 4-1, and the connecting end cover 11 is perpendicular to the axis of the motor rotor shaft 4-1. The connecting end portion of the sun gear 3-4 is provided with an external spline, and the center portion of the connecting end cover 11 is recessed and provided with an internal spline. The connecting end portion of the sun gear 3-4 is spline-connected to the connecting end cover 11.

[0043] Control the permanent magnet synchronous motor 4 to start, drive the motor rotor shaft 4-1 to rotate, and transmit torque to the sun gear 3-4 through the spline connection between the connecting end cover 11 of the motor rotor shaft 4-1 and the connecting end portion of the sun gear 3-4. The sun gear 3-4 serves as the power input end of the planetary speed reducer 3, and can transmit power to the planet carrier 3-5, and finally transmit the reduced speed and increased torque to the output flange 1.

[0044] The gear transmission structure of the planetary reducer 3 eliminates the bevel gear train compared with the traditional vertical mill gearbox, and simplifies the multi-stage planetary reducer 3 into a single-stage planetary reducer 3. The simplified planetary reducer 3 can further reduce the gear transmission loss, thereby significantly improving the transmission efficiency of the vertical mill power system, reducing energy consumption, achieving energy conservation and emission reduction, and reducing costs and increasing efficiency. In addition, the permanent magnet synchronous motor 4 replaces the traditional high-voltage asynchronous motor. The natural high power factor of the permanent magnet synchronous motor 4 enables the power system of the present utility model to save 5-15% of energy comprehensively compared with the power system of the traditional vertical roller mill. At a load of at least 20%, the motor efficiency can still be maintained above 90%, further improving the transmission efficiency and reducing energy consumption. At the same time, the permanent magnet synchronous motor 4 does not need to replace vulnerable parts such as slip rings and carbon brushes like high-voltage asynchronous motors, and the use of a low-speed permanent magnet synchronous motor 4 makes the single-stage planetary gearbox more reliable, thus effectively reducing the failure rate of the vertical mill power system.

[0045] Furthermore, the permanent magnet synchronous motor 4 and the planetary reducer 3 share the upper housing 7 and the lower housing 12, with a highly integrated structure. The connecting end of the sun gear 3-4 is located inside the motor rotor shaft 4-1, eliminating the traditional coupling and reducing the overall height dimension of the machine. Compared with the traditional vertical mill reducer, only a single-stage planetary reducer 3 remains in the gear transmission part, further reducing the overall volume of the machine. It can be installed and replaced within the volume of the traditional vertical mill reducer. Compared with the traditional vertical mill power system, no separate motor and coupling are required, saving on-site installation space.

[0046] To make the transmission process between the motor rotor shaft 4-1 and the sun gear 3-4 more stable and further reduce the installation space of the whole machine, the edge of the connecting port of the upper housing base 9 extends vertically downward to form the inner housing 14, and the inner housing 14 is cylindrical. The inner housing 14 is coaxially inserted into the motor rotor shaft 41, and the connecting end of the sun gear 34 coaxially penetrates through the hollow channel of the inner housing 14. The connecting end cover 11 is located on the lower side of the inner housing 14. A combined bearing 16 is provided between the outer cylindrical surface of the inner housing 14 and the motor rotor shaft 4-1. The combined bearing 16 includes at least two rolling bearings 3-3. In the embodiment of the present utility model, it is limited to two rolling bearings 3-3. In other embodiments of the present utility model, it can be set to three, four, or multiple rolling bearings 3-3.

[0047] The inner housing 14 is embedded in the motor rotor shaft 4-1, and a combined bearing 16 is provided between the outer cylindrical surface of the inner housing 14 and the motor rotor shaft 4-1, making the rotation of the motor rotor shaft 4-1 relative to the inner housing 14 more stable. And the above structure makes full use of the space between the inner housing and the motor rotor shaft 4-1, further reducing the overall height of the machine and the installation space occupied by the vertical mill power system.

[0048] In order to make the combined bearing 16 guide the rotation of the motor rotor shaft 4-1 relative to the inner housing 14 more stably, the bearing seat of the lowermost rolling bearing 3-3 of the combined bearing 16 is fixedly connected to the outer cylindrical surface of the inner housing 14 through a locking sleeve and a locking bolt, and a spacer sleeve 17 is placed between the bearing seats of the two rolling bearings 3-3 of the combined bearing 16. The upper end face of the motor rotor shaft 4-1 is fixedly connected with a fixed end cover 10 by bolts, and the fixed end cover 10 abuts against the bearing seat of the uppermost rolling bearing 3-3 of the combined bearing 16.

[0049] The locking bolt and the fixed end cover 10 limit and support the combined bearing 16, and the spacer sleeve 17 provides support for the bearing seats of the combined bearing 16, so that the combined bearing 16 is stably and fixedly installed on the inner housing 14; at the same time, the fixed end cover 10, the connecting end cover 11 and the combined bearing 16 cooperate to form a cantilever support layout for the motor rotor 4-2 of the permanent magnet synchronous motor 4, making the power transmission between the motor rotor shaft 4-1 and the sun gear 3-4 more stable. In addition, the spacer sleeve 17 also has the function of adjusting the clearance of the combined bearing 16. By reducing the clearance of the combined bearing, sufficient rigidity is provided for the cantilever support, making the rotational support between the combined bearing 16 and the motor rotor shaft 4-1 and the inner housing 14 more stable.

[0050] To prevent the oil in the lubricated combined bearing 16 from splashing into the permanent magnet synchronous motor 4, a skeleton oil seal is provided at the contact position between the fixed end cover 10 and the combined bearing 16. The skeleton oil seal can prevent the oil in the lubricated combined bearing 16 from splashing out, reducing the lubricating oil from splashing into the permanent magnet synchronous motor 4, and avoiding potential safety hazards to the structure of the permanent magnet synchronous motor 4 and affecting the heat dissipation performance and operating efficiency of the motor.

[0051] To prevent the lubricating oil in the planetary reducer 3 from splashing into the permanent magnet synchronous motor 4, the connecting end cover 11 is provided with an oil hole, a baffle ring 21 is arranged between the connecting end cover 11 and the bottom of the lower housing 12, a skeleton oil seal is arranged between the baffle ring 21 and the connecting end cover 11, and at least two oil outlets 22 are opened on the base 13 of the lower housing, and the at least two oil outlets 22 are circumferentially distributed along the axis of the connecting end cover 11. In the embodiment of the present invention, it is limited to two oil outlets 22, and in other embodiments of the present invention, the number of oil outlets 22 can be three, four or more.

[0052] After the lubricating oil passes through the internal oil circuit of the planetary reducer 3, it flows into the base 13 of the lower housing through the oil hole of the connecting end cover 11. At the same time, a baffle ring 21 and a skeleton seal 15 are arranged between the connecting end cover 11 and the base 13 of the lower housing to prevent the oil from splashing into the permanent magnet synchronous motor 4. Then the lubricating oil flows out through the oil outlet 22, enters the lubrication system, and then enters the planetary reducer 3 through the oil pump to complete the cycle, further achieving energy conservation and emission reduction.

[0053] To reduce noise pollution, a copper pad 20 and a support pin 19 are fixedly arranged on the connecting end cover 11, and the support pin 19 passes through the copper pad 20. The connecting end of the sun gear 3-4 abuts against the copper pad 20, and the support pin 19 is inserted into the lower end face of the axle of the sun gear 3-4 coaxially. The provision of the connecting end of the sun gear 3-4 is conducive to the deformation and floating of the sun gear 3-4. Then, through the cooperation of the copper pad 20 and the support pin 19 with the connecting end of the sun gear 3-4, axial floating and support are further provided for the sun gear 3-4 to achieve a better shock absorption effect, so that the system has low vibration noise and reduces noise pollution.

[0054] A thrust bearing 2 and a thrust block 6 are arranged between the output flange 1 and the upper housing base 9, and the output flange 1, the thrust bearing 2, the thrust block 6 and the upper housing base 9 are mutually attached from top to bottom. After the external vertical dynamic and static loads are transmitted to the output flange 1, they are supported by the thrust bearing 2 and act on the thrust block 6. The thrust block 6 transmits the loads to the upper housing base 9, and finally passes through the lower housing 12 to be transmitted to the foundation, so as to reduce the axial loads borne by the output flange 1, the planet carrier 3-5, as well as the upper housing 7 and the lower housing 12, thereby reducing the losses of each component of the vertical mill power system, improving the service life, and further reducing costs and increasing efficiency.

[0055] In other embodiments of the present invention, the permanent magnet semi-direct drive power transmission system for a vertical mill further includes a slow drive device, a frequency conversion controller, a lubrication system, etc. as components of the system. The lubrication system is used to supply oil for lubrication to the bearings in the system and the gear structure in the planetary reducer 3. The frequency conversion controller is used to control the start of the permanent magnet synchronous motor 4. The slow drive device drives the small gear to mesh with the large gear ring of the output flange 1 to drive the output flange 1 to rotate slowly for easy maintenance.

[0056] The implementation principle of a permanent magnet semi-direct drive power transmission system for a vertical mill in an embodiment of the present invention is as follows: The lubrication system operates, and the frequency conversion controller controls the start of the permanent magnet synchronous motor 4 to drive the rotation of the motor rotor shaft 4-1. Through the spline connection between the connecting end cover 11 of the motor rotor shaft 4-1 and the connecting end of the sun gear 3-4, torque is transmitted to the sun gear 3-4. The sun gear 3-4 serves as the power input end of the planetary reducer 3 and can transmit power to the planet carrier 3-5, and finally the speed is reduced and the torque is increased and then transmitted to the output flange 1.

[0057] At the same time, after the external vertical dynamic and static loads are transmitted to the output flange 1, they are supported by the thrust bearing 2 and act on the thrust block 6. The thrust block 6 transmits the loads to the upper housing base 9, and finally passes through the lower housing 12 and the lower housing base 13 to be transmitted to the foundation.

[0058] When the lubrication system is running, after the lubricating oil passes through the internal oil circuit of the planetary reducer 3, it flows into the lower housing base 13 through the oil hole connecting the end cover 11. At the same time, an oil retaining ring 21 and a skeleton seal 15 are provided between the connecting end cover 11 and the lower housing base 13 to prevent the oil from splashing into the permanent magnet synchronous motor 4. Then the lubricating oil flows out through the oil outlet 22, enters the lubrication system, and then enters the planetary reducer 3 through the oil pump to complete the cycle.

[0059] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A permanent magnet semi-direct drive power transmission system for a vertical mill, characterized in that: The invention comprises a main housing, a planetary reducer (3) arranged inside the main housing, and a permanent magnet synchronous motor (4), wherein the planetary reducer (3) comprises a horizontally arranged inner gear ring (3-1), a planetary gear (3-2) meshed with the inner ring of the inner gear ring (3-1), a sun gear (3-4) meshed with the planetary gear (3-2), and a planetary carrier (3-5) fixed to the wheel shaft of the planetary gear (3-2), wherein the planetary carrier (3-5) is connected to an output flange (1), the sun gear (3-4) is coaxially arranged with the inner gear ring (3-1), and the sun gear (3-4) is coaxially arranged with the inner gear ring (3-1). The connecting end of the sun gear (3-4) is formed by vertically extending outward from the axial center of the permanent magnet synchronous motor (4); the motor rotor (4-2) of the permanent magnet synchronous motor (4) is fixedly provided with a motor rotor shaft (4-1), the connecting end of the sun gear (3-4) is penetrated through the motor rotor shaft (4-1) with the same central axis, and the motor rotor shaft (4-1) is vertically fixed with a connecting end cover (11), the connecting end cover (11) is connected to the connecting end of the sun gear (3-4) and drives the connecting end of the sun gear (3-4) to rotate horizontally.

2. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 1 is characterized in that: An internal shell (14) is arranged inside the overall shell, and the internal shell (14) is coaxially inserted into the hollow motor rotor shaft (4-1) of the permanent magnet synchronous motor (4). The connecting end of the sun gear (3-4) coaxially passes through the hollow channel of the internal shell (14). The connecting end cover (11) is located at the lower side of the internal shell (14) and is fixedly connected to one end of the motor rotor shaft (4-1) away from the planetary reducer (3). A combined bearing (16) is arranged between the outer cylindrical surface of the internal shell (14) and the motor rotor shaft (4-1).

3. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 2 is characterized in that: A fixed end cover (10) is bolted to the upper end surface of the motor rotor shaft (4-1); the fixed end cover (10) contacts an end of the combined bearing (16) away from the connecting end cover (11); an end of the combined bearing (16) close to the connecting end cover (11) is fixedly mounted on the internal housing (14) by means of locking bolts; a distance sleeve (17) is provided inside the combined bearing (16) for providing support between the bearing seats of the combined bearing (16).

4. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 3 is characterized in that: A skeleton oil seal is provided at the contact point between the fixed end cover (10) and the combined bearing (16).

5. The permanent magnet semi-direct drive power transmission system for vertical mill according to any one of claims 1 or 2, characterized in that: The connecting end cover (11) is provided with an oil hole, and a skeleton oil seal is provided between the connecting end cover (11) and the shell wall of the main shell.

6. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 5, characterized in that: An oil deflector ring (21) is arranged between the connecting end cover (11) and the shell wall of the main shell, the skeleton oil seal is arranged between the oil deflector ring (21) and the connecting end cover (11), and an oil outlet (22) is provided on the shell wall of the main shell corresponding to the oil guide path of the oil deflector ring (21).

7. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 1 or 2, characterized in that: The sun gear (3-4) is located above the motor rotor shaft (4-1), the connecting end cover (11) is fixedly provided with a copper pad (20) and a support pin (19), the connecting end of the sun gear (3-4) abuts against the copper pad (20), and the support pin (19) is inserted into the lower end surface of the wheel shaft of the sun gear (3-4) coaxially with the central axis.

8. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 1 or 2, characterized in that: The overall housing comprises an upper housing (7) and a lower housing (12) which are fixedly connected to each other and whose cavities are connected; the planetary reducer (3) is arranged on the upper housing (7); the permanent magnet synchronous motor (4) is arranged on the lower housing (12); an upper housing base (9) is arranged between the upper housing (7) and the lower housing (12); the inner gear ring (3-1) is fixedly arranged on the upper housing base; and the planet carrier (3-5) and the planetary gear (3-2) axles are both rotatably connected to the upper housing base (9).

9. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 8, characterized in that: The upper end of the upper shell (7) is open, the output flange (1) is placed on the upper end of the upper shell (7), a thrust bearing (2) and a thrust block (6) are arranged between the output flange (1) and the upper shell base (9), and the output flange (1), the thrust bearing (2), the thrust block (6) and the upper shell base (9) are arranged to fit each other from top to bottom.

10. The permanent magnet semi-direct drive power transmission system for vertical mill according to claim 8, characterized in that: The lower edges of the planet carrier (3-5) and the axle of the planetary wheel (3-2) are located in the same plane, and a sliding bearing is provided between the lower edges of the planet carrier (3-5) and the axle of the planetary wheel (3-2) and the upper housing base (9).

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