CN114618648A - Vertical roller mill with grinding roller and grinding disc dual drives - Google Patents
Vertical roller mill with grinding roller and grinding disc dual drives Download PDFInfo
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- CN114618648A CN114618648A CN202210337585.0A CN202210337585A CN114618648A CN 114618648 A CN114618648 A CN 114618648A CN 202210337585 A CN202210337585 A CN 202210337585A CN 114618648 A CN114618648 A CN 114618648A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/007—Mills with rollers pressed against a rotary horizontal disc
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C2015/008—Roller drive arrangements
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- Crushing And Grinding (AREA)
Abstract
The invention belongs to the technical field of vertical roller mill equipment, and particularly relates to a vertical roller mill with double drives of a grinding roller and a grinding disc, wherein the vertical roller mill with the double drives of the grinding roller and the grinding disc comprises a main motor, a grinding disc and a grinding roller driving assembly; the main motor drives the main speed reducer and the grinding disc to rotate through the main motor coupler, and materials are fed through the reamer and are sent to the center of the grinding disc; the grinding roller driving assembly comprises a grinding roller motor, an upper rocker arm, a lower rocker arm, a grinding roller assembly, a hydraulic oil cylinder and a bracket, and is uniformly distributed on the grinding disc; two hydraulic oil cylinders are adopted for synchronous loading, the grinding roller assembly rotates downwards around the rocker shaft by the tensile force of the hydraulic oil cylinders, and materials are ground on the grinding disc; the grinding roller assembly is driven by a grinding roller motor to actively rotate, and the input power and the rotating speed of each grinding roller are equal. The invention provides the vertical roller mill with the double drives of the grinding roller and the grinding disc, which has the advantages that the main motor and the grinding roller motor are directly driven by the speed-adjustable motor, the grinding efficiency and the yield of the mill are improved, and the electricity consumption is saved.
Description
Technical Field
The invention belongs to the technical field of vertical roller mill equipment, and particularly relates to a vertical roller mill with double drives of a grinding roller and a grinding disc.
Background
The prior art is as follows:
the existing vertical roller mill is widely applied to the production of powder materials such as raw materials, coal powder, cement, slag and the like. The vertical mill is characterized in that a main motor drives a main speed reducer and a grinding disc to rotate through a coupling, and a grinding roller is used for grinding materials on the grinding disc in a pressurizing manner.
However, the present inventors have found that the above prior art has at least the following technical problems:
the defects of the prior art are that the vertical mill actively rotates by a grinding disc, a grinding roller is driven to rotate by the friction force generated by grinding materials, and the grinding roller passively rotates; the grinding roller frequently swings during operation, and the friction force of materials on the grinding roller is unstable, so that the linear velocity of the grinding roller in a grinding area is always smaller than that of a grinding disc, and the problem of large velocity difference exists; therefore, materials are accumulated in front of the grinding roller and cannot be actively bitten into a grinding area, so that the grinding machine vibrates greatly, the grinding efficiency is reduced, and products with high specific surface are difficult to grind. Particularly, when the friction coefficient of the materials is small, such as high-silicon cement and pure-silicon cement, the problems of large exposed vibration, low yield, high power consumption and the like of the vertical mill are particularly prominent.
Along with the increasing demand of the large-scale of the vertical mill, the motor power and the torque of the speed reducer which need to be configured are larger, the manufacturing difficulty and the cost of the vertical mill are greatly increased, and the reliability is reduced. If different materials need to be ground, the rotating speed of the grinding disc needs to be adjusted, but the manufacturing difficulty and the cost of a frequency converter of a high-power motor are too high, so that the grinding disc basically adopts a constant rotating speed, and the traditional vertical mill has poor adaptability to grinding of various materials.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the grinding roller and grinding disc dual-drive vertical roller mill which has the advantages that the main motor and the grinding roller motor are directly driven by the speed-adjustable motor, the grinding efficiency and the yield of the mill are improved, and the electricity consumption is saved has important practical significance.
Disclosure of Invention
The utility model aims to provide a vertical roller mill of grinding roller and mill double drive that main motor and grinding roller motor all adopt adjustable speed motor direct drive for solving the technical problem among the prior art, improved the output of grinding efficiency and mill to practice thrift the power consumption.
The technical scheme adopted by the embodiment of the application to solve the technical problems in the prior art is as follows:
the vertical roller mill with the double driving of the grinding roller and the grinding disc comprises a main motor, the grinding disc and a grinding roller driving assembly; the main motor drives the main speed reducer and the grinding disc to rotate through the main motor coupler, and materials are fed through the reamer and are sent to the center of the grinding disc; the grinding roller driving assembly comprises a grinding roller motor, an upper rocker arm, a lower rocker arm, a grinding roller assembly, a hydraulic oil cylinder and a bracket, and is uniformly distributed on the grinding disc; two hydraulic oil cylinders are adopted for synchronous loading, the grinding roller assembly rotates downwards around the rocker shaft by the tensile force of the hydraulic oil cylinders, and materials are ground on the grinding disc; the grinding roller assembly is driven by a grinding roller motor to actively rotate, and the input power and the rotating speed of each grinding roller are equal;
the grinding roller motor passes through bolted connection on the motor support, the motor support passes through bolted connection then goes up the rear end face of rocking arm, be equipped with the annular hole on the motor support so that the installation of shaft coupling, the grinding roller motor passes through shaft coupling and rotation axis connection, the rotation axis passes through aligning roller bearing A, deep groove ball bearing, the axle head support is connected in the hollow shaft cover, the end of rotation axis adopts a pair of tangential key-type connection on stifled, stifled passes through drive pin axle and connecting bolt fixes on wheel hub, wheel hub's outside is equipped with the grinding roller cover, it is fixed through clamping ring and T type bolt.
The embodiment of the application can also adopt the following technical scheme:
in the vertical roller mill with the double driving of the grinding roller and the grinding disc, further, the grinding roller and the grinding disc are respectively directly driven by a speed-adjustable motor, the grinding roller motor is a permanent magnet direct drive motor, and the main motor is a variable frequency motor; the linear velocity of the grinding roller in the grinding area is equal to or slightly greater than the linear velocity of the grinding disc in the grinding area.
Each grinding roller is driven by a grinding roller motor independently; the adjustment of parameters such as various rotating speeds, power and the like can be realized, so that the device is suitable for different materials and achieves an ideal state. The grinding roller and the grinding disc are rotated to actively bite the material into the grinding area by utilizing the friction force (namely the clamping force) of the material, so that the material is prevented from being accumulated at the front end of the grinding roller, the relative sliding between the material and the grinding roller is reduced, and the stability of a material layer and the grinding efficiency are improved.
In the vertical roller mill with the grinding roller and the grinding disc driven by the grinding roller, further, the power of the grinding roller motor multiplied by the number of the grinding rollers is equal to the power of the main motor.
The friction force of the grinding disc to the material and the friction force of the grinding roller to the material at the grinding area are approximately equal, the load matching of the grinding roller motor and the main motor is in a balanced state, and the service life of the grinding roller motor and the main motor can be prolonged.
In the vertical roller mill with the grinding roller and the grinding disc driven by the double drives, the roller sleeve is further fixed in the wheel hub through the pressing ring and the T-shaped bolt.
The roller sleeve can be conveniently replaced, the roller sleeve can be in the shape of a conical roller, a column roller, a tire roller and a conical tire roller, and the corresponding grinding disc lining plate is in the shape of a flat disc, a sloping disc, a bowl disc and a special-shaped disc. Namely, the grinding roller driving component is applied to vertical mills such as a flat disc conical roller, a flat disc column roller, a sloping cam plate column roller, a bowl disc tire roller, a conical tire roller and the like.
In the vertical roller mill driven by the grinding roller and the grinding disc, further, the hollow shaft sleeve is a hollow shaft, a self-aligning roller bearing A is arranged in the upper end of the hollow shaft sleeve, a shaft end support is arranged at the tail end of the hollow shaft sleeve, a deep groove ball bearing is arranged in the shaft end support, a rotating shaft is connected in the hollow shaft sleeve through the self-aligning roller bearing A, the deep groove ball bearing and the shaft end support, the hollow shaft sleeve is fixedly connected in the upper rocker arm through two groups of expansion sleeves and a pressing cover, and a cylindrical bearing and a double-row conical bearing are arranged outside the lower end of the hollow shaft sleeve and are arranged in a hub; wherein, the double-row conical bearing is positioned at the big end of the roller sleeve of the grinding roller, and the cylindrical bearing is positioned at the small end of the roller sleeve of the grinding roller.
The bearing size selected by the configuration structure of the bearing is minimum, and the cost is optimal.
In the vertical roller mill with the double driving of the grinding roller and the grinding disc, further, the grinding roller is driven by a rotating shaft in a hollow shaft sleeve, and the hollow shaft sleeve is a fixed mandrel and only bears bending moment when in work; the hollow shaft sleeve is provided with an oil inlet hole, an oil return hole and an air hole.
The air holes are used for ensuring that the grinding roller can be automatically communicated with the atmosphere when pressure difference occurs between the inside and the outside of the cavity of the grinding roller, so that oil return is smooth. The grinding roller bearing is provided with an independent grinding roller lubricating oil station, a lubricating and cooling mode of forced oil supply of the thin oil station and oil absorption of an oil return pump is adopted, and the oil supply amount and the oil return amount are equal. Oil enters the cavity of the grinding roller from the oil inlet hole, and returns to the oil tank from the oil return hole by adopting a mode of low-level oil inlet and high-level oil return. The circulating oil can take away heat generated during the operation of the bearing and impurities in the bearing, and the service life of the grinding roller bearing is prolonged.
In the vertical roller mill with the grinding roller and the grinding disc driven, furthermore, two hydraulic oil cylinders are adopted for synchronous loading, one end of each hydraulic oil cylinder is hinged with the lower rocker arm, the other end of each hydraulic oil cylinder is hinged with the support, a self-aligning roller bearing B is arranged in an oil cylinder upper lug ring of each hydraulic oil cylinder, an oil cylinder pin shaft is arranged in each self-aligning roller bearing B, and two cylindrical bearings are arranged in the middle area of each oil cylinder pin shaft and fixed in the lower lug part of the lower rocker arm.
The rotation flexibility of the oil cylinder pin shaft can be improved, and the risk of fracture of the oil cylinder pin shaft is avoided. Because the grinding roller drive is added, the stability of a material layer is improved, and the working pressure of the grinding roller can be greatly improved. The projection pressure of each grinding roller can reach 1600KN/m2The projection pressure of the grinding roller of the traditional vertical mill is 1200KN/m2There is an increase of about 33%, thus ensuring a very high grinding efficiency and allowing the production of products of higher fineness.
In the vertical roller mill with the grinding roller and the grinding disc driven by the double drives, furthermore, a rocker arm shaft is arranged between the upper rocker arm and the lower rocker arm and is fixed in a bearing seat of the bracket, the upper rocker arm and the lower rocker arm are connected by adopting four taper pin taper sleeve assemblies, and the taper pin taper sleeves are provided with conical surfaces with equal tapers; the opening of taper sleeve adopts the design of not opening completely, and the thick region of taper sleeve is opened completely, and the thin region of taper sleeve does not open to increase the area of contact of taper pin and taper sleeve, improve the bearing capacity of taper pin taper sleeve, the opening of taper sleeve is down during the installation, and the taper pin compresses tightly through belleville spring and end cover, and belleville spring is used for the buffering to inhale the shake.
In the vertical roller mill driven by the grinding roller and the grinding disc, further, the upper rocker arm is provided with a sealing frame and a material blocking ring, the gap between the sealing frame and the periphery of the sealing door of the middle shell is about 10mm, the outer part of the hub is provided with a horn sleeve, and an annular gap smaller than 5mm is reserved between the material blocking ring and the horn sleeve.
The sealing air is continuously provided by the single fan, enters from the air hole of the upper rocker arm and enters the oil seal area of the grinding roller, so that the sealing air is isolated from dust in the grinding roller, and the service life of the oil seal and the bearing of the grinding roller is prolonged.
In the vertical roller mill with the grinding roller and the grinding disc driven by the double drives, further, a rocker arm bracket is arranged at the rear end of the upper rocker arm, the rocker arm bracket is hinged with a roller turning oil cylinder, and the lower part of the roller turning oil cylinder is hinged on a roller turning support behind the bracket.
The grinding roller can be turned out of the grinder through the pulling force of the roller turning oil cylinder so as to be convenient to overhaul. When the grinding roller assembly is maintained, a grinding roller motor, a motor support, a coupling and the like are disassembled, a rocker arm support is arranged at the rear end of an upper rocker arm in a bolt connection mode, a roller turning oil cylinder is arranged, and the lower portion of the roller turning oil cylinder is hinged to a roller turning support behind the support. The grinding roller is slowly turned out from the grinding machine through the pulling force of the roller turning oil cylinder, so that the grinding roller can be conveniently overhauled.
One or more technical schemes provided in the embodiment of the application have at least the following beneficial effects:
1. the main motor and the grinding roller motor are both directly driven by the speed-adjustable motor, the grinding roller and the grinding disc are both active workpieces, compared with the traditional vertical mill, the grinding roller motor for driving the grinding roller is added, the power and the output torque of the main motor are greatly reduced, and the advantages of the main motor and the grinding roller motor on the large vertical mill are more obvious.
2. The main motor of the invention adopts a variable frequency motor, the grinding roller motor adopts a permanent magnet direct drive motor, the output rotating speed and power of each grinding roller are ensured to be equal, and the adjustment of parameters such as various rotating speeds, powers and the like can be realized to adapt to different materials and achieve an ideal state.
3. The linear velocity of the grinding roller in the grinding area is equal to or slightly greater than that of the grinding disc, and the material is actively bitten into the grinding area, so that the material is prevented from being accumulated at the front section of the grinding roller, the relative sliding between the material and the grinding roller is reduced, and the stability of a material layer and the grinding efficiency are improved;
4. compared with the traditional vertical mill, the vertical mill has better stability, can adopt higher rolling pressure, has high energy effective transfer utilization rate, can produce products with higher specific surface, improves the grinding efficiency and the yield of the mill, and saves the power consumption.
5. The vertical mill has higher operation reliability and operation rate, when one grinding roller driving motor fails, the grinding roller is only required to be pressed on the grinding disc to prevent the grinding disc from being unbalanced loaded, the mill can still operate, and only the yield is reduced to a certain extent. The device can effectively improve the stability and the grinding efficiency of the grinding machine and improve the yield of the grinding machine.
Drawings
Technical solutions of embodiments of the present application will be described in further detail below with reference to the accompanying drawings, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present application. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic view of a vertical roller mill with dual drive of grinding rollers and grinding discs according to the invention; (ii) a
FIG. 2 is a cross-sectional view of a grinding roll drive assembly;
FIG. 3 is a schematic view of an oil hole in the hollow shaft sleeve;
FIG. 4 is a cross-sectional view of a cylinder pin;
FIG. 5 is a cross-sectional view of the taper pin and taper sleeve assembly;
FIG. 6 is a schematic view of a turn-over roller;
fig. 7 is a three-dimensional view of a modular grinding roll drive assembly.
In the figure: 1. a main motor, 2, a main motor coupling, 3, a speed reducer, 4, a reamer, 5, a grinding disc, 6, a scraping plate, 7, an air duct, 8, a support, 8a, a turning roller support, 8b, a bearing seat, 9, a hydraulic oil cylinder, 10, a lower rocker arm, 11, a grinding roller assembly, 12, an air ring, 13, a rocker shaft, 14, an upper rocker arm, 14a, an upper rocker arm taper sleeve hole, 15, a motor support, 16, a coupling, 17, a grinding roller motor, 18, a middle shell sealing door, 19, a rotating shaft, 20, a hollow shaft sleeve, 20a, an oil inlet hole, 20b, an oil return hole, 20c, an air vent hole, 21, a horn sleeve, 22, a double-row conical bearing, 23, a hub, 24, a grinding roller sleeve, 25, a T-shaped bolt, 26, a pressing ring, 27, a transmission pin shaft pin, 28, a blank cap, 29, a shaft end support, 30, a deep groove ball bearing, 31, a tangential key, 32, a cylindrical bearing, 33 and a connecting bolt, 34. the device comprises a material blocking ring 35, a sealing frame 36, an expansion sleeve 37, self-aligning roller bearings A and 38, a gland 39, an oil cylinder upper lug ring 40, self-aligning roller bearings B and 41, a cylindrical bearing 42, an oil cylinder pin shaft 43, a taper sleeve 43a, an opening of the taper sleeve 44, a taper pin 45, a belleville spring 46, an end cover 47, a roll-turning oil cylinder 48 and a rocker arm support.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
The vertical roller mill with the double drives of the grinding roller and the grinding disc, the grinding roller and the grinding disc are respectively directly driven by the speed-adjustable motor and are active work pieces. The main motor 1 drives the main speed reducer 3 and the grinding disc 5 to rotate through the main motor coupler 2, and materials are fed to the center of the grinding disc through the reamer feed 4. The material moves towards the edge of the grinding disc under the action of centrifugal force, and forms a material layer on the grinding disc and is pushed into a grinding area when the grinding machine runs. The grinding roller assembly 11 is driven by the grinding roller motor 17 to actively rotate, the grinding roller motor 17 adopts a permanent magnet direct drive motor, the linear velocity of the grinding roller in the grinding area is equal to or slightly greater than that of the grinding disc, the materials are actively engaged into the grinding area by utilizing the friction force (namely the clamping force) of the grinding roller assembly 11 and the grinding disc 5 to the materials when rotating, the materials are prevented from being accumulated at the front end of the grinding roller, the relative sliding between the materials and the grinding roller is reduced, the vibration of the grinding machine is reduced, and the stability of the grinding machine is improved.
The crushed material overflows from the edge of the grinding disc 5 and is simultaneously lifted by the high-speed airflow from the air ring 12, and coarse particles fall to the grinding disc 5 for grinding again. The small particles are brought into a powder selecting machine, qualified fine powder flows out of the mill along with air, and is collected in a dust collecting device, so that the product is obtained. The coarse powder is separated by a powder separator, falls back to the grinding disc 5 and is ground again; a part of large-particle materials fall into the air ring 12 and the air duct 7 and are discharged out of the mill by the scraper 6.
Each grinding roller driving assembly comprises a grinding roller motor 17, an upper rocker arm 14, a lower rocker arm 10, a grinding roller assembly 11, a hydraulic oil cylinder 9 and a bracket 8, and the grinding roller driving assemblies are uniformly distributed on the grinding disc. Each grinding roller is driven by a grinding roller motor 17 independently, the grinding roller motor 17 adopts a permanent magnet direct drive motor, the rotating speed is adjustable, and the input power and the rotating speed of each grinding roller can be guaranteed to be equal. The grinding roller motor 17 is connected to the motor support 15 through bolts, the motor support 15 is connected to the rear end face of the upper rocker arm 14 through bolts, and the motor support 15 is provided with an annular hole for mounting the coupler 16. The grinding roller motor 17 is connected with a rotating shaft 19 through a coupling 16, and the rotating shaft 19 is connected in the hollow shaft sleeve 20 through a self-aligning roller bearing A37, a deep groove ball bearing 30 and a shaft end support 29. The hollow shaft sleeve 20 is a hollow shaft, a self-aligning roller bearing A37 is arranged in the upper end of the hollow shaft sleeve, a shaft end support 29 is arranged at the tail end of the hollow shaft sleeve, and a deep groove ball bearing 30 is arranged in the shaft end support 29. The end of the rotating shaft 19 is connected to the blank cap 28 by a pair of tangential keys 31(120 degree installation), and the blank cap 28 is fixed on the hub 23 by a driving pin 27 and a connecting bolt 33. The rotating shaft 19 is a transmission shaft, and only bears torque during operation, and the rotating shaft 19 is driven to rotate by the rotation of the grinding roller motor 17, so as to drive the grinding roller assembly 11 to rotate.
The grinding roller driving assembly adopts a modular design, and the same grinding roller driving assembly can be used for grinding discs of different specifications. The grinding roller assembly 11, the hydraulic oil cylinder 9, the upper rocker arm 14, the lower rocker arm 10, the support 8 and the like are used as independent pressurizing units, and the modular design can be realized by changing the grinding roller motors 17, the number of the grinding rollers, the main motor 1, the disc body 5 and the like, so that the requirements of various yields are met.
The hollow shaft sleeve 20 is fixedly connected in the upper rocker arm 14 through two groups of expansion sleeves 36 and a gland 38, and a cylindrical bearing 32 and a double-row conical bearing 22 are arranged outside the lower end of the hollow shaft sleeve 20 and are arranged in the hub 23. Wherein the double-row conical bearing 22 is positioned at the large end of the grinding roller sleeve, and the cylindrical bearing 32 is positioned at the small end of the grinding roller sleeve. The bearing size selected by the configuration structure of the bearing is minimum, and the cost is optimal. The outside of the hub 23 is provided with a grinding roller sleeve 24 which is fixed by a clamping ring 26 and a T-shaped bolt 25. The grinding roller sleeve 24 can be conveniently replaced, the grinding roller sleeve 24 can be a conical roller, a column roller, a tire roller and a conical tire roller, and the corresponding grinding disc lining plate can be a flat disc, a sloping disc, a bowl disc and a special-shaped disc. The hollow shaft sleeve 20 is a fixed mandrel and only bears bending moment during operation. The hollow shaft sleeve 20 is provided with an oil inlet hole 20a, an oil return hole 20b and an air hole 20 c. The air holes are used for ensuring that the grinding roller can be automatically communicated with the atmosphere when pressure difference occurs between the inside and the outside of the cavity of the grinding roller, so that oil return is smooth. The grinding roller bearing is provided with an independent grinding roller lubricating oil station, a lubricating cooling mode of forced oil supply of the thin oil station and oil absorption of the oil return pump is adopted, and the oil supply amount and the oil return amount are equal. Oil enters the cavity of the grinding roller from the oil inlet hole, and returns to the oil tank from the oil return hole by adopting a mode of low-level oil inlet and high-level oil return. The circulating oil can take away heat generated during the operation of the bearing and impurities in the bearing, and the service life of the grinding roller bearing is prolonged.
Two hydraulic oil cylinders 9 are adopted for synchronous loading, one end of each hydraulic oil cylinder 9 is hinged with a lower rocker arm 10, and the other end of each hydraulic oil cylinder 9 is hinged with a support 8. A self-aligning roller bearing B40 is arranged in an upper lug ring 39 of the hydraulic oil cylinder, an oil cylinder pin shaft 42 is arranged in a self-aligning roller bearing B40, two cylindrical bearings 41 are arranged in the middle area of the oil cylinder pin shaft 42 and fixed in the lower lug part of the lower rocker arm 10, the rotation flexibility of the oil cylinder pin shaft 42 can be improved, and the risk of breakage of the oil cylinder pin shaft is avoided. The pulling force of the hydraulic oil cylinder 9 enables the grinding roller assembly 11 to rotate downwards around the rocker arm shaft 13, materials are ground on the grinding disc 5, and the materials are ground under the action of the gravity, the grinding force, the shearing force and the like of the grinding roller. Because the grinding roller drive is added, the material is actively bitten into the grinding area, and the stability of the material layer is improved. The projection pressure of each grinding roller can reach 1600KN/m2The projection pressure of the grinding roller of the traditional vertical mill is 1200KN/m2There is an increase of about 33%, thus ensuring a very high grinding efficiency and allowing the production of products of higher fineness.
The upper rocker arm 14 is provided with a sealing frame 35 and a material blocking ring 34, and the clearance between the sealing frame 35 and the middle shell sealing door 18 is about 10 mm. The outside of wheel hub 23 is equipped with horn cover 21, keeps off and has the annular clearance that is less than 5mm between material ring 34 and the horn cover 21, can guarantee the wind speed of here sealed wind, reduces the material and gets into in the horn cover. The sealing air is continuously provided by a single fan, and enters from the air hole of the upper rocker arm 14 to the oil seal area of the grinding roller, so that the sealing air is isolated from dust in the mill, and the service life of the oil seal of the grinding roller and the bearing of the grinding roller is prolonged.
A rocker shaft 13 is provided between the upper rocker arm 14 and the lower rocker arm 10, and is fixed in a bearing seat 8b of the bracket 8. The upper rocker arm 14 and the lower rocker arm 10 are connected by four taper pin taper sleeve assemblies, and the taper pin taper sleeves are provided with conical surfaces with equal taper. The opening 43a of the taper sleeve 43 is designed to be not opened, the thick area of the taper sleeve is opened, and the thin area of the taper sleeve is not opened, so that the contact area of the taper pin 44 and the taper sleeve 43 is increased, the bearing capacity of the taper pin taper sleeve is improved, and the opening 43a of the taper sleeve faces downwards during installation. The taper pin 44 is pressed by a disc spring 45 and an end cover 46, and the disc spring 45 is used for buffering and absorbing shock.
When the grinding roller assembly 11 is overhauled, the grinding roller motor 17, the motor support 15, the coupling 16 and the like are disassembled, the rear end of the upper rocker 14 is connected and provided with a rocker support 48 and a roller overturning oil cylinder 47 by bolts, and the lower part of the roller overturning oil cylinder 47 is hinged on a roller overturning support 8a behind the support 8. The grinding roller assembly 11 is slowly turned out of the mill by the pulling force of the roller-turning cylinder 47 for maintenance.
In conclusion, the invention provides the vertical roller mill with the double drives of the grinding roller and the grinding disc, which has the advantages that the main motor and the grinding roller motor are directly driven by the speed-adjustable motors, the grinding efficiency and the yield of the mill are improved, and the power consumption is saved.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. Vertical roller mill of grinding roller and mill double drive, its characterized in that: the vertical roller mill with the grinding roller and the grinding disc driven by the grinding roller comprises a main motor, a grinding disc and a grinding roller driving assembly; the main motor drives the main speed reducer and the grinding disc to rotate through the main motor coupler, and materials are fed through the reamer and are sent to the center of the grinding disc; the grinding roller driving assembly comprises a grinding roller motor, an upper rocker arm, a lower rocker arm, a grinding roller assembly, a hydraulic oil cylinder and a bracket, and is uniformly distributed on the grinding disc; two hydraulic oil cylinders are adopted for synchronous loading, the grinding roller assembly rotates downwards around the rocker shaft by the tensile force of the hydraulic oil cylinders, and materials are ground on the grinding disc; the grinding roller assembly is driven by a grinding roller motor to actively rotate, and the input power and the rotating speed of each grinding roller are equal;
the grinding roller motor passes through bolted connection on the motor support, the motor support passes through bolted connection then goes up the rear end face of rocking arm, be equipped with the annular hole on the motor support so that the installation of shaft coupling, the grinding roller motor passes through shaft coupling and rotation axis connection, the rotation axis passes through aligning roller bearing A, deep groove ball bearing, the axle head support is connected in the hollow shaft cover, the end of rotation axis adopts a pair of tangential key-type connection on stifled, stifled passes through drive pin axle and connecting bolt fixes on wheel hub, wheel hub's outside is equipped with the grinding roller cover, it is fixed through clamping ring and T type bolt.
2. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the grinding roller and the grinding disc are respectively directly driven by a speed-adjustable motor, the grinding roller motor is a permanent magnet direct drive motor, and the main motor is a variable frequency motor; the linear velocity of the grinding roller in the grinding area is equal to or slightly greater than the linear velocity of the grinding disc in the grinding area.
3. The vertical roller mill with double drives of grinding roller and grinding disc according to claim 1, characterized in that: the power of the grinding roller motors multiplied by the number of the grinding rollers is equal to the power of the main motor.
4. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the roller sleeve is fixed in the wheel hub through a pressing ring and a T-shaped bolt.
5. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the hollow shaft sleeve is a hollow shaft, a self-aligning roller bearing A is arranged in the upper end of the hollow shaft sleeve, a shaft end support is arranged at the tail end of the hollow shaft sleeve, a deep groove ball bearing is arranged in the shaft end support, a rotating shaft is connected in the hollow shaft sleeve through the self-aligning roller bearing A, the deep groove ball bearing and the shaft end support, the hollow shaft sleeve is fixedly connected in an upper rocker arm through two groups of expansion sleeves and a gland, a cylindrical bearing and a double-row conical bearing are arranged outside the lower end of the hollow shaft sleeve, and the hollow shaft sleeve is arranged in a hub; wherein, the double-row conical bearing is positioned at the big end of the roller sleeve of the grinding roller, and the cylindrical bearing is positioned at the small end of the roller sleeve of the grinding roller.
6. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the grinding roller is driven by a rotating shaft in the hollow shaft sleeve, and the hollow shaft sleeve is a fixed mandrel and only bears bending moment during working; the hollow shaft sleeve is provided with an oil inlet hole, an oil return hole and an air hole.
7. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the hydraulic loading device is characterized in that two hydraulic oil cylinders are used for synchronous loading, one end of each hydraulic oil cylinder is hinged to the lower rocker arm, the other end of each hydraulic oil cylinder is hinged to the support, a self-aligning roller bearing B is arranged in an oil cylinder upper lug of each hydraulic oil cylinder, an oil cylinder pin shaft is arranged in each self-aligning roller bearing B, and two cylindrical bearings are arranged in the middle area of each oil cylinder pin shaft and fixed in the lower lug portion of the lower rocker arm.
8. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: a rocker shaft is arranged between the upper rocker arm and the lower rocker arm and is fixed in a bearing seat of the bracket, the upper rocker arm and the lower rocker arm are connected by adopting four taper pin taper sleeve assemblies, and the taper pin taper sleeves are respectively provided with conical surfaces with equal tapers; the opening of taper sleeve adopts the design of not opening completely, and the thick region of taper sleeve is opened completely, and the thin place of taper sleeve does not open to increase the area of contact of taper pin and taper sleeve, improve the bearing capacity of taper pin taper sleeve, the opening of taper sleeve is down during the installation, and the taper pin compresses tightly through belleville spring and end cover, and belleville spring is used for the buffering to inhale the shake.
9. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: go up the rocking arm and be equipped with seal carrier, keep off the material ring, seal carrier and well casing sealing door clearance all around about 10mm, wheel hub's outside is equipped with the loudspeaker cover, keeps off and has the annular gap that is less than 5mm between material ring and the loudspeaker cover.
10. A vertical roller mill with double drive of grinding rollers and grinding discs according to claim 1, characterized in that: the rear end of the upper rocker arm is provided with a rocker arm bracket, the rocker arm bracket is hinged with a roller turning oil cylinder, and the lower part of the roller turning oil cylinder is hinged on a roller turning support at the back of the bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210337585.0A CN114618648A (en) | 2022-03-31 | 2022-03-31 | Vertical roller mill with grinding roller and grinding disc dual drives |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210337585.0A CN114618648A (en) | 2022-03-31 | 2022-03-31 | Vertical roller mill with grinding roller and grinding disc dual drives |
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| CN114618648A true CN114618648A (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210337585.0A Withdrawn CN114618648A (en) | 2022-03-31 | 2022-03-31 | Vertical roller mill with grinding roller and grinding disc dual drives |
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| CN (1) | CN114618648A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116197013A (en) * | 2023-05-06 | 2023-06-02 | 合肥中亚建材装备有限责任公司 | Durable built-in bearing type grinding roller single-double support vertical mill capable of preventing oil leakage |
| CN117583108A (en) * | 2023-12-12 | 2024-02-23 | 山东华锴重工机械有限公司 | Vertical pulverizer |
| CN118060011A (en) * | 2024-04-22 | 2024-05-24 | 溧阳中材重型机器有限公司 | Grinding mechanism of vertical roller mill for coal |
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| CN118060011A (en) * | 2024-04-22 | 2024-05-24 | 溧阳中材重型机器有限公司 | Grinding mechanism of vertical roller mill for coal |
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