Direct-drive transmission system of vertical mill

Abstract

The utility model relates to a vertical mill direct-drive transmission system which comprises a servo direct-drive motor, the servo direct-drive motor comprises a shell, the upper end of the shell is connected with a millstone supporting mechanism, a junction box is arranged on the outer wall of the shell, a stator assembly connected with the junction box is arranged on the inner wall of the shell, and a rotor transmission shaft is rotationally arranged in the center of the shell through a bearing. A rotor assembly matched with the stator assembly to work is arranged on the rotor transmission shaft, a sleeve hole is formed in the upper end of the rotor transmission shaft, a rotary encoder is connected to the lower end of the rotor transmission shaft, a driving shaft in the millstone supporting mechanism is arranged in the sleeve hole in a sleeved mode, and a plurality of cylindrical pins used for power transmission are arranged between the driving shaft and the rotor transmission shaft. The device has the advantages of reasonable structural design, direct drive, small occupied space, energy-saving drive, high efficiency, accuracy and the like.

Description

Technical field:

[0001] The utility model relates to the technical field of vertical mills, in particular to a direct-drive transmission system of a vertical mill. Background technology:

[0002] Vertical mill is a grinding equipment that integrates fine crushing, drying, grinding, powder selection and transportation. It is widely used in the grinding and ultra-fine grinding of various solid materials in cement, building materials, electric power, metallurgy, chemical industry, non-metallic minerals and other industries.

[0003] The working principle and structural layout of existing vertical mills are relatively mature, such as Figure 3 The figure shows the structure of the existing vertical mill. The motor drives the grinding disc to rotate through the vertical reducer. The solid raw material enters the center of the grinding disc from the feed port through the air-locking feeding device. Under the action of the centrifugal field, it is thrown to the periphery of the grinding disc and crushed by the repeated rolling of the grinding roller. The crushed material overflows from the edge of the grinding disc, and the powdery material is carried up by the high-speed airflow rising from the bottom of the machine. When the rising airflow and the powdery material pass through the powder selector at the top of the mill, the coarse powder is separated and falls into the center of the grinding disc for re-grinding under the action of the fast-rotating rotor, and the fine powder is discharged from the top of the mill with the airflow and collected in the dust collecting device, which is the product.

[0004] The structure of the vertical reducer used in the existing vertical mill is as follows: Figure 4 As shown, it includes a transmission shaft, which is connected to the grinding disc support mechanism through a bevel gear transmission mechanism and a planetary gear transmission mechanism in sequence. The grinding disc is installed on the upper end of the grinding disc support mechanism. A thrust bearing transmission mechanism is provided in the grinding disc support mechanism. The driving shaft in the thrust bearing transmission mechanism is connected to the planetary gear transmission structure to realize power transmission. It can be seen from the above transmission principle that any transmission through the intervention of a third party will have transmission loss, which will cause some energy loss. Secondly, the motor itself will also consume some power when rotating to the rated speed, which is about 10% to 15% of the total power of the motor. Therefore, the power loss caused by the motor's own loss and transmission efficiency is 20% to 25%. According to the calculation of a 500-kilowatt motor losing the minimum 20% of effective power, it is calculated according to 20 hours a day and 300 days a year, which means that the energy loss is about 600,000 kilowatts. That is to say, the power loss of a 1.9-meter vertical mill exceeds 600,000 kilowatts / hour per year. In addition, the speed of the vertical mill is generally 90r / min, so it is necessary to change the speed through multiple stages to meet the rotation requirements of the grinding disc, mainly through the first-stage bevel gear transmission mechanism and the second-stage planetary gear transmission mechanism to achieve the speed change requirements. The cost of deceleration maintenance and maintenance of this structure is also relatively high. Therefore, it is necessary to improve the drive part of the existing vertical mill in order to achieve energy saving, high efficiency and precise drive.

[0005] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility model content:

[0006] The purpose of the utility model is to solve the problems existing in the prior art and provide a direct-drive transmission system for a vertical mill, which has the advantages of reasonable structural design, direct drive, small footprint, energy-saving drive, high efficiency and precision, etc.

[0007] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0008] A direct-drive transmission system for a vertical mill comprises a servo direct-drive motor, wherein the servo direct-drive motor comprises a shell, wherein the upper end of the shell is connected to a grinding disc support mechanism, a terminal box is arranged on the outer wall of the shell, and a stator assembly connected to the terminal box is arranged on the inner wall, a rotor transmission shaft is rotatably arranged at the center of the shell through a bearing, a rotor assembly cooperating with the stator assembly is arranged on the rotor transmission shaft, a sleeve hole is arranged at the upper end of the rotor transmission shaft, and a rotary encoder is connected to the lower end, a driving shaft sleeve in the grinding disc support mechanism is arranged in the sleeve hole, and a plurality of cylindrical pins for power transmission are arranged between the driving shaft and the rotor transmission shaft.

[0009] A water guide groove for cooling is arranged on the outer wall of the shell, and a cover plate for sealing the water guide groove is arranged on the shell.

[0010] The stator assembly comprises a stator core, which is installed and positioned with the housing by means of heat-shrink fitting. The stator core is provided with a stator winding, and tooth pressure plates are respectively provided at the upper and lower ends of the stator core.

[0011] The rotor assembly comprises a rotor core arranged on a rotor transmission shaft, a magnetic steel is arranged on the outer wall of the rotor core, and magnetic isolation sheets are respectively arranged at the upper and lower ends of the rotor core.

[0012] The stator core is formed by stacking multiple stator punchings, and the rotor core is formed by stacking multiple rotor punchings. The stator punchings and rotor punchings are respectively stamped from silicon steel sheets. The stator punchings and tooth pressure plates are fastened and connected by stud bolts and locking nuts, and the rotor punchings and magnetic isolation plates are fastened and connected by stud bolts and locking nuts.

[0013] The rotary encoder is connected to the rotor transmission shaft through a flexible coupling.

[0014] A reinforcing plate is provided between the shell and the grinding disc supporting mechanism.

[0015] The utility model adopts the above structure, which can bring the following beneficial effects:

[0016] The original driving scheme of the electric motor and the vertical reducer is replaced by the servo direct-drive motor of this application, which effectively reduces the size of the foundation and the overall floor space of the equipment; the lubrication system is changed from the original need to lubricate the vertical reducer and the grinding disc support mechanism to only lubricate the grinding disc support mechanism. The servo direct-drive motor of this application does not require lubrication, which effectively reduces the lubrication drive power; the drive structure is simplified, the gear transmission is completely eliminated, and the rigid impact is shielded; the servo direct drive is used to effectively improve the energy conversion efficiency, and the drive is energy-saving, efficient and precise; the motor is designed with a low-speed, high-torque structure, and the rated speed of the motor is the working speed of the mill, without speed change loss, small starting current, and small impact on the power grid; the motor stator and rotor use magnetic gaps to transfer energy without direct contact; the motor rotor has no coil and does not generate heat, only generates heat on the stator coil and is equipped with circulating cooling to cool down in time. Description of the drawings:

[0017] Figure 1 It is a structural schematic diagram of the direct drive transmission system of the vertical mill of the utility model;

[0018] Figure 2 for Figure 1 AA section view in the figure;

[0019] Figure 3 It is a structural schematic diagram of an existing vertical mill;

[0020] Figure 4 It is a cross-sectional view of an existing vertical reducer;

[0021] In the figure, 1, casing, 2, grinding disc supporting mechanism, 3, terminal box, 4, stator assembly, 401, stator core, 402, stator winding, 403, tooth pressure plate, 5, bearing, 6, rotor transmission shaft, 7, rotor assembly, 701, rotor core, 702, magnetic steel, 703, magnetic isolation plate, 8, sleeve hole, 9, rotary encoder, 10, cylindrical pin, 11, water guide groove, 12, cover plate, 13, stud bolt, 14, locking nut, 15, flexible coupling, 16, driving shaft, 17, reinforcement plate, 18, motor, 19, vertical reducer, 20, bevel gear transmission mechanism, 21, planetary gear transmission mechanism, 22, thrust bearing, 23, existing vertical mill. Specific implementation method:

[0022] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0024] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0025] Furthermore, the terms “inner wall”, “outer wall”, “vertical”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the location of the indicated technical features.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-2 As shown, the direct-drive transmission system of the vertical mill includes a servo direct-drive motor, and the servo direct-drive motor includes a shell 1, and the upper end of the shell 1 is connected to the grinding disc support mechanism 2. The grinding disc support mechanism 2 here adopts the existing technology. The outer wall of the shell 1 is provided with a terminal box 3, and the inner wall is provided with a stator assembly 4 connected to the terminal box 3. The center of the shell 1 is rotatably provided with a rotor transmission shaft 6 through a bearing 5, and the rotor transmission shaft 6 is provided with a rotor assembly 7 that cooperates with the stator assembly 4. The upper end of the rotor transmission shaft 6 is provided with a sleeve hole 8, and the lower end is connected to a rotary encoder 9. The driving shaft 16 in the grinding disc support mechanism 2 is sleeved in the sleeve hole 8, and a plurality of cylindrical pins 10 for power transmission are provided between the driving shaft 16 and the rotor transmission shaft 6. The original driving scheme of the electric motor 17 and the vertical reducer 18 (including the bevel gear transmission mechanism 20 and the planetary gear transmission mechanism 21) is replaced by the servo direct drive motor of this application, which effectively reduces the size of the foundation and the overall floor space of the equipment; the lubrication system is changed from the original need to lubricate the vertical reducer 18 and the grinding disc support mechanism 2 to only lubricate the grinding disc support mechanism 2. The servo direct drive motor of this application does not require lubrication, which effectively reduces the lubrication drive power; the driving structure is simplified, the gear transmission is completely eliminated, and the rigid impact is shielded; the use of servo direct drive effectively improves the energy conversion efficiency, and the drive is energy-saving, efficient and precise; the motor is designed with a low-speed, high-torque structure, and the rated speed of the motor is the working speed of the mill, there is no speed change loss, the starting current is small, and the impact on the power grid is small; the motor stator and rotor use magnetic gaps to transfer energy without direct contact; the motor rotor has no coils and does not generate heat, and only generates heat on the stator coil.

[0028] The outer wall of the housing 1 is provided with a water channel 11 for cooling, and the housing 1 is provided with a cover plate 12 for sealing the water channel 11. When the water channel 11 is connected to a circulating cooling system, circulating cooling water (liquid) in the water channel can be passed to quickly and efficiently cool the housing.

[0029] The stator assembly 4 includes a stator core 401, which is installed and positioned with the housing 1 by shrink-fitting. The stator core 401 is provided with a stator winding 402, and the upper and lower ends of the stator core 401 are respectively provided with tooth pressure plates 403. The stator assembly 4 generates a rotating magnetic field.

[0030] The rotor assembly 7 includes a rotor core 701 disposed on the rotor transmission shaft 6, a magnetic steel 702 is disposed on the outer wall of the rotor core 701, and magnetic isolation sheets 703 are respectively disposed at the upper and lower ends of the rotor core 701. The rotor assembly 7 rotates in the rotating magnetic field generated by the stator assembly 4, thereby converting electromagnetic energy into mechanical energy, that is, driving the rotor transmission shaft 6 to rotate.

[0031] The stator core 401 is formed by laminating a plurality of stator punchings, and the rotor core 701 is formed by laminating a plurality of rotor punchings. The stator punchings and the rotor punchings are respectively formed by stamping silicon steel sheets. The stator punchings and the tooth pressure plate 403 are fastened and connected by stud bolts 13 and locking nuts 14, and the rotor punchings and the magnetic isolation plate 703 are fastened and connected by stud bolts 13 and locking nuts 14. The stud bolts 13 and locking nuts 14 are used for reliable connection.

[0032] The rotary encoder 9 is connected to the rotor transmission shaft 6 via a flexible coupling 15. The rotary encoder 9 can provide feedback on the rotation speed, direction and position of the rotor transmission shaft 6.

[0033] A reinforcing plate 17 is provided between the housing 1 and the grinding disc supporting mechanism 2 to strengthen the connection structure.

[0034] The technical solution of this application needs to be connected to the control system of the existing vertical mill 23 when it is actually applied. In order to accurately control the temperature of the servo direct-drive motor of this application, a temperature sensor can be installed on the stator winding 402 to monitor the temperature of the three-phase winding. The temperature sensor transmits the monitored temperature to the temperature controller in real time. The temperature controller adjusts the circulating water volume of the circulating cooling system according to the monitored temperature to ensure that the servo direct-drive motor is in the optimal temperature working range. The circulating cooling system and the temperature controller can be purchased directly. The circulating cooling system can pass cooling water into the water guide groove 11 through a pipeline to cool the servo direct-drive motor.

[0035] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0036] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Vertical mill direct drive transmission system, characterized in that: It comprises a servo direct-drive motor, which comprises a shell, the upper end of which is connected to a grinding disc support mechanism, a terminal box is arranged on the outer wall of the shell, a stator assembly connected to the terminal box is arranged on the inner wall, a rotor transmission shaft is rotatably arranged at the center of the shell through a bearing, a rotor assembly cooperating with the stator assembly is arranged on the rotor transmission shaft, a sleeve hole is arranged at the upper end of the rotor transmission shaft, a rotary encoder is connected to the lower end, a driving shaft sleeve in the grinding disc support mechanism is arranged in the sleeve hole, and a plurality of cylindrical pins for power transmission are arranged between the driving shaft and the rotor transmission shaft.

2. The direct drive transmission system of the vertical mill according to claim 1, characterized in that: A water guide groove for cooling is arranged on the outer wall of the shell, and a cover plate for sealing the water guide groove is arranged on the shell.

3. The direct drive transmission system of the vertical mill according to claim 1 or 2, characterized in that: The stator assembly comprises a stator core, which is installed and positioned with the housing by means of heat-shrink fitting. The stator core is provided with a stator winding, and tooth pressure plates are respectively provided at the upper and lower ends of the stator core.

4. The direct drive transmission system of the vertical mill according to claim 3, characterized in that: The rotor assembly comprises a rotor core arranged on a rotor transmission shaft, a magnetic steel is arranged on the outer wall of the rotor core, and magnetic isolation sheets are respectively arranged at the upper and lower ends of the rotor core.

5. The direct drive transmission system of the vertical mill according to claim 4, characterized in that: The stator core is formed by stacking multiple stator punchings, and the rotor core is formed by stacking multiple rotor punchings. The stator punchings and rotor punchings are respectively stamped from silicon steel sheets. The stator punchings and tooth pressure plates are fastened and connected by stud bolts and locking nuts, and the rotor punchings and magnetic isolation plates are fastened and connected by stud bolts and locking nuts.

6. The direct drive transmission system of the vertical mill according to claim 5, characterized in that: The rotary encoder is connected to the rotor transmission shaft through a flexible coupling.

7. The direct drive transmission system of the vertical mill according to claim 6, characterized in that: A reinforcing plate is provided between the shell and the grinding disc supporting mechanism.

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