Direct-drive power device for vertical mill

Abstract

The invention relates to a direct-drive power device for a vertical mill. The direct-drive power device comprises a motor direct-drive unit; and a deceleration unit; a main shaft and a lower end cover in the motor direct drive unit are connected through a bearing assembly, the bearing assembly comprises an upper bearing cover and a lower bearing cover, and a bearing cavity is formed among the inner walls of the upper bearing cover, the lower bearing cover and the lower end cover; one side of the lower bearing cover extends outwards in the radial direction to be provided with an oil inlet pipe, an oil inlet hole is formed in the oil inlet pipe, and one end of the oil inlet hole is communicated with a bearing cavity. The other side of the lower bearing cover extends outwards in the radial direction to be provided with an oil outlet pipe, an oil outlet hole is formed in the oil outlet pipe, an oil outlet gap is formed between the upper bearing cover and the top of the lower end cover, an oil outlet transition hole is vertically formed in the lower end cover, the top of the oil outlet transition hole is communicated with the oil outlet gap, and the bottom of the oil outlet transition hole is communicated with the oil outlet hole. In this way, cooling of the bearing assembly is completed through lower-inlet and upper-outlet of the lubricating cooling liquid, and online cooling of the bearing assembly can also be achieved in the working process of the motor direct drive unit.

Description

Technical Field

[0001] This invention relates to vertical mills, and more particularly to a direct-drive power unit for vertical mills. Background Technology

[0002] Vertical roller mills are grinding equipment that integrates fine crushing, drying, grinding, powder classification, and conveying. They are widely used in the grinding and ultrafine crushing of various solid materials in industries such as cement, building materials, power, metallurgy, chemicals, and non-metallic minerals. Their power components typically consist of a high-speed asynchronous motor with an external reducer to output low speed and high torque.

[0003] In practical applications, due to the low torque and high speed characteristics of asynchronous motors, a multi-stage reducer is generally required to achieve the intended use. Under multi-stage reduction conditions, the output efficiency of asynchronous motors will generally decrease to about 70%, resulting in significant efficiency waste.

[0004] Furthermore, during the operation of the vertical mill, the main shaft and the lower end cover are connected by a bearing assembly. In the high temperature and high pressure environment, the temperature of the bearing assembly is high. Conventional bearing assemblies will wear and fail due to high temperature. How to achieve cooling of the bearing assembly at the main shaft and the lower end cover has become an urgent problem for researchers in this field. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to achieve online cooling of the bearing assembly at the spindle and lower end cover; To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention relates to a direct-drive power unit for a vertical mill, comprising: a motor direct-drive unit; and a reduction unit, wherein the output end of the motor direct-drive unit is connected to the input end of the reduction unit; the main shaft of the motor direct-drive unit is connected to the lower end cover via a bearing assembly, the bearing assembly including an upper bearing cover and a lower bearing cover, the upper bearing cover, the lower bearing cover, and the inner wall of the lower end cover forming a bearing cavity; an oil inlet pipe is provided radially outward on one side of the lower bearing cover, the oil inlet pipe having an oil inlet hole, one end of the oil inlet hole being connected to the bearing cavity; an oil outlet pipe is provided radially outward on the other side of the lower bearing cover, the oil outlet pipe having an oil outlet hole, an oil outlet gap is provided between the top of the upper bearing cover and the lower end cover, and an oil outlet transition hole is vertically provided on the lower end cover, the top of the oil outlet transition hole communicating with the oil outlet gap, and the bottom of the oil outlet transition hole communicating with the oil outlet hole.

[0006] Furthermore, the top of the outer wall of the deceleration unit is provided with a positioning notch that matches the oil outlet pipe and the oil inlet pipe.

[0007] Furthermore, a positioning ring is provided protruding from the bottom of the lower end cover; The top of the outer wall of the deceleration unit is provided with a positioning stop that matches the positioning ring.

[0008] Furthermore, once the positioning ring and the positioning stop are matched, the locking member passes vertically through the lower end cover and connects to the outer wall.

[0009] Furthermore, a protective cover is provided on the outer wall, which is connected to the lower end cover, and the protective cover has a window to avoid the oil inlet pipe and the oil outlet pipe.

[0010] The beneficial effects of this invention are as follows: This invention is a direct-drive power unit for a vertical mill. The lubricating coolant can enter the bearing cavity through the oil inlet hole, complete the heat exchange and cooling of the rollers and cage, and then be discharged through the oil outlet gap, oil outlet transition hole, and oil outlet hole. In this way, the lubricating coolant is introduced from the bottom and discharged from the top to cool the bearing assembly. The motor direct-drive unit can also achieve online cooling of the bearing assembly during operation. In addition, the output efficiency of the motor can be improved by connecting the permanent magnet direct-drive motor and the planetary reducer in series. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a partial sectional view of this embodiment; Figure 2 yes Figure 1 Enlarged view of point A; Figure 3 This is a schematic diagram of the outer wall structure; Figure 4 This is a schematic diagram of the structure of this embodiment. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0014] This embodiment describes a direct-drive power unit for a vertical mill. See [link / reference]. Figure 1 , Figure 1 The figure shows a cross-sectional view of an embodiment. The upper part is the motor direct drive unit 1, which specifically adopts a permanent magnet direct drive motor. The lower part is the reduction unit 2, which specifically adopts a planetary reducer. The output end (i.e., the main shaft) of the motor direct drive unit 1 is connected to the input end of the reduction unit 2. Specifically, a locking member passes through the lower end cover 11 from top to bottom and connects to the top of the outer wall 21 of the reduction unit 2, thereby realizing a detachable connection between the motor direct drive unit 1 and the reduction unit 2. The series connection of the permanent magnet direct drive motor and the planetary reducer can improve the output efficiency of the motor.

[0015] See Figure 2 , Figure 2 for Figure 1 The enlarged view at point A shows that the main shaft 12 passes through the lower end cover 11 and is connected to the lower end cover 11 by a bearing assembly. The bearing assembly includes an upper bearing cover 13 and a lower bearing cover 14 arranged vertically. A bearing cavity 15 is formed between the inner walls of the upper bearing cover 13, the lower bearing cover 14, and the lower end cover 11. A bearing and a cage are provided in the bearing cavity 15.

[0016] An oil inlet pipe 16 extends to the left from the left side of the lower bearing cover 14, and an oil inlet hole 161 is provided inside the oil inlet pipe 16. The right end of the oil inlet hole 161 is connected to the bearing cavity 15. An oil outlet pipe 17 extends to the right from the right side of the lower bearing cover 14, and an oil outlet hole 171 is provided inside the oil outlet pipe 17. An oil outlet gap 18 is formed between the upper bearing cover 13 and the lower end cover 11. An oil outlet transition hole 19 is vertically connected to the lower end cover 11. The top of the oil outlet transition hole 19 is connected to the oil outlet gap 18, and the bottom of the oil outlet transition hole 19 is connected to the oil outlet hole 171. See Figure 2 As indicated by the arrow, the lubricating coolant can enter the bearing cavity 15 through the oil inlet 161, and after completing the heat exchange and cooling of the rollers and cage, it is discharged through the oil outlet gap 18, the oil outlet transition hole 19, and the oil outlet hole 171. In this way, the lubricating coolant is introduced from the bottom and discharged from the top to cool the bearing assembly. The motor direct drive unit can also achieve online cooling of the bearing assembly during operation.

[0017] See Figure 3 , Figure 3 The diagram shows the structure of the outer wall 21 of the deceleration unit 2. The top of the outer wall 21 has a positioning notch 22 facing downward. When the deceleration unit 2 needs to be connected to the motor direct drive unit 1, the positioning notch 22 is matched with the oil inlet pipe 16 or the oil outlet pipe 17, which can quickly realize the circumferential positioning connection between the deceleration unit 2 and the motor direct drive unit 1.

[0018] The top of the outer wall 21 has a positioning stop 23, and the bottom of the lower end cover 11 has a protruding positioning ring 111. In this way, the inner diameter of the positioning stop 23 matches the outer diameter of the positioning ring 111, so as to realize the radial positioning connection between the deceleration unit 2 and the motor direct drive unit 1.

[0019] See Figure 4 , Figure 4 This is a schematic diagram of the structure of this embodiment. A protective cover 3 is also provided on the outer periphery of the outer wall 21. The protective cover 3 serves to prevent dust. In order to avoid the oil inlet pipe 16 and the oil outlet pipe 17, a window 31 is provided on the protective cover 3. The protective cover 3 and the lower end cover 11 are detachably connected by a locking member.

[0020] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A direct-drive power unit for a vertical mill, characterized in that, include: Direct drive unit for motors; And a reduction unit, wherein the output end of the motor direct drive unit is connected to the input end of the reduction unit; In the direct drive unit of the motor, the main shaft and the lower end cover are connected by a bearing assembly. The bearing assembly includes an upper bearing cover and a lower bearing cover. The upper bearing cover, the lower bearing cover and the inner wall of the lower end cover form a bearing cavity. An oil inlet pipe is provided radially outward on one side of the lower bearing cover. An oil inlet hole is provided inside the oil inlet pipe, and one end of the oil inlet hole is connected to the bearing cavity. An oil outlet pipe is provided radially outward on the other side of the lower bearing cover. An oil outlet hole is provided in the oil outlet pipe. An oil outlet gap is provided between the top of the upper bearing cover and the lower end cover. An oil outlet transition hole is vertically provided on the lower end cover. The top of the oil outlet transition hole is connected to the oil outlet gap, and the bottom of the oil outlet transition hole is connected to the oil outlet hole.

2. The direct-drive power unit for a vertical mill according to claim 1, characterized in that, The top of the outer wall of the deceleration unit has a positioning notch that matches the oil outlet pipe and the oil inlet pipe.

3. The direct-drive power unit for a vertical mill according to claim 1, characterized in that, A positioning ring is provided protruding from the bottom of the lower end cover; The top of the outer wall of the deceleration unit is provided with a positioning stop that matches the positioning ring.

4. The direct-drive power unit for a vertical mill according to claim 3, characterized in that, Once the positioning ring and positioning stop are matched, the locking member passes vertically through the lower end cover and connects to the outer wall.

5. A direct-drive power unit for a vertical mill according to claim 3, characterized in that, A protective cover is also provided on the outer wall, the protective cover is connected to the lower end cover, and the protective cover has a window to avoid the oil inlet pipe and the oil outlet pipe.

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