Vertical flour mill

Abstract

The utility model relates to the technical field of coal milling equipment, in particular to a vertical type flour mill which comprises a box body, the box body is arranged on one side of a flour mill body, the lower end of the flour mill body is fixedly connected with a permanent magnet synchronous direct drive motor, a collecting barrel is placed in the box body, the upper end of the box body is fixedly connected with a filter screen, and a discharging port of the flour mill body is fixedly communicated with a conveying pipe. And one end of the conveying pipe penetrates through the filter screen and extends into the box body. According to the vertical flour mill, the permanent magnet synchronous direct drive motor is adopted, so that the application problems of heavy load starting, power balance, data acquisition and comprehensive protection, productivity improvement, energy consumption reduction and the like are solved; the device has good compatibility, can be used in cooperation with existing equipment, and can also independently complete work; the system has good network expansion performance, can realize on-site data recording and transmission and local automatic control, can access a network to realize data sharing and remote control, and finally realizes intelligent control.

Description

Technical Field

[0001] The utility model relates to the technical field of coal grinding equipment, in particular to a vertical grinding mill. Background Art

[0002] Vertical mill is a special coal mill equipment. The process principle mainly includes four steps: crushing, grinding, classification and powder collection. The coal mill is driven by an electric motor. The reduction device and the vertically arranged main shaft drive the grinding disc or grinding ring to rotate. The raw coal enters the surface of the two sets of relatively moving grinding parts through the coal drop pipe. Under the action of the pressing force, it is squeezed and ground into coal powder. The ground coal powder rotates with the grinding coal parts. Under the centrifugal force, the coal and coal powder are constantly pushed to the top of the wind ring. The hot air enters the drying space at a certain wind speed after being rectified by the wind ring equipped with uniform flow guide blades, dries the coal powder, and brings the coal powder into the coal powder separator on the coal mill. The unqualified coarse powder is separated in the separator and returned to the grinding area for re-grinding. The qualified coal powder enters the primary air duct through the coal powder distributor and directly enters the furnace through the burner to participate in combustion. The coal grinding stones and stones that are difficult to grind in the coal are discharged out of the mill.

[0003] During operation, if the temperature of the equipment groove is above 68℃, the thrust bearing of the reducer will be seriously damaged and the machine will be shut down for maintenance. Frequent start-up and heavy-load start-up will cause the main motor of the mill to start: the YKK800kW-10kV motor control unit system will output a signal feedback unit and corrugated resistor to burn out; since the mill is started at industrial frequency; the coal mill reducer is often started and operated frequently under heavy load and low speed or heavy load and high speed. When starting, a large torque is generated on the thrust bearing position of the reducer and the thrust bearing surface of the bearing. In addition, the radial impact caused by the vibration of the equipment during startup can easily cause the clearance fit of the thrust bearing surface to wear and metal fatigue due to relative movement; these problems seriously affect the efficiency and service life of the thrust bearing, and will also shorten the service life of the equipment.

[0004] Due to this multi-point mechanical transmission structure driving mode, the mechanical transmission loss is high, the transmission efficiency is low, the mechanical wear is serious, the power consumption is large, the speed reducer failure rate is high, the equipment occupies a large space, and the equipment maintenance workload is large. The above reasons have caused the problem of high equipment maintenance cost and production cost; moreover, in the process of discharging materials, a lot of powder will leak and drift into the outside air, which will not only cause a lot of material waste and loss, but also cause certain dust pollution to the air environment, and it is not convenient to collect the powder produced by the mill. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the multi-point mechanical transmission structure driving mode in the prior art, such as high mechanical transmission loss, low transmission efficiency, serious mechanical wear, large power consumption, high speed reducer failure rate, large equipment space occupation, and large equipment maintenance workload, and to propose a vertical grinding mill.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A vertical grinding mill is designed, comprising a box body, which is arranged on one side of a grinding mill body, a permanent magnet synchronous direct drive motor is fixedly connected to the lower end of the grinding mill body, a collecting cylinder is placed in the box body, a filter screen is fixedly connected to the upper end of the box body, a material outlet of the grinding mill body is fixedly connected to a material delivery pipe, and one end of the material delivery pipe passes through the filter screen and extends into the box body.

[0008] Preferably, an opening is formed through the outer wall of the box body, a first cylinder is fixedly connected to one side of the box body, one end of the first cylinder is fixedly connected to a bracket, and the bracket passes through the opening, and a plurality of third cylinders are fixedly connected to both sides of the inner wall of the bracket at equal intervals, one end of the plurality of third cylinders are fixedly connected to support bars, and two of the support bars are arranged relative to each other.

[0009] Preferably, a sealing plate is fixedly connected to one end of the bracket away from the first cylinder, and the sealing plate is located in the box.

[0010] Preferably, the two support bars are respectively provided with symmetrically arranged arc-shaped grooves.

[0011] Preferably, a baffle is fixedly connected inside the bracket, and a storage cylinder is fixedly connected to one side of the box body.

[0012] Preferably, a second cylinder is fixedly connected to the upper surface of the filter screen, a lower end of the second cylinder penetrates into the box body and is fixedly connected to a pressure block, and the pressure block is located directly above the collecting cylinder.

[0013] The utility model proposes a vertical grinding mill, which has the following beneficial effects: the vertical grinding mill adopts a permanent magnet synchronous direct drive motor to solve the application problems of heavy load starting, power balance, data collection and comprehensive protection, increase of production capacity, and reduction of energy consumption; it has good compatibility, and can be used in conjunction with existing equipment, and can also complete the work independently; it has good network expansion performance, and can realize local data recording and transmission, local automatic control, and can also access the network to realize data sharing and remote control, and finally realize intelligent control; the permanent magnet direct drive system adopts a low-speed and high-torque permanent magnet synchronous motor to connect with the thrust bearing assembly of the coal mill to form a permanent magnet direct drive system. Since the permanent magnet motor itself has a high efficiency and eliminates the transmission structure such as the reducer, the permanent magnet direct drive system can greatly improve the system efficiency, reduce mechanical loss, reduce the size of the equipment, reduce the amount of equipment maintenance, and can greatly reduce many problems of equipment vibration and noise, and improve the production environment on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a three-dimensional structural schematic diagram of a vertical grinding mill.

[0015] Figure 2 The utility model is a partial structural schematic diagram of a vertical grinding mill proposed by the utility model.

[0016] Figure 3 The utility model is a schematic diagram of the internal structure of a box of a vertical grinding mill.

[0017] Figure 4 The utility model is a partial structural schematic diagram of a vertical grinding mill proposed by the utility model.

[0018] Figure 5 The utility model is a structural cross-sectional view of a vertical grinding mill when collecting powder.

[0019] In the figure: 1. box body; 2. box door; 3. filter screen; 4. feed pipe; 5. collecting cylinder; 6. first cylinder; 7. bracket; 8. baffle; 9. storage cylinder; 10. second cylinder; 11. sealing cover; 12. third cylinder; 13. support bar; 14. pressing block; 15. grinding mill body; 16. permanent magnet synchronous direct drive motor; 17. through port; 18. sealing plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Example 1

[0022] Reference Figure 1-3 and Figure 5 A vertical grinding mill comprises a box body 1, wherein the box body 1 is arranged on one side of a grinding mill body 15, and a permanent magnet synchronous direct drive motor 16 is fixedly connected to the lower end of the grinding mill body 15.

[0023] The vertical mill eliminates the original transmission system such as the reducer, and adopts a permanent magnet synchronous direct drive motor 16 to directly drive the mill groove and the lower load; this design adopts a permanent magnet variable frequency direct drive system, and the permanent magnet drive system of the coal mill consists of a variable frequency control system and a permanent magnet synchronous motor. The variable frequency control system uses a 10000V power supply, which is small in size, light in weight, and economical; the comprehensive design at the system level ensures the consistency, compatibility and reliability of the overall equipment. In view of the characteristics of the permanent magnet synchronous motor drive, a humanized comprehensive control software is designed, which is easy to operate and realizes the good operation of the equipment; the permanent magnet variable frequency direct drive system modification retains the thrust bearing of the vertical mill reducer, combines it with the motor body, eliminates the reducer, and the motor directly drives the mill to simplify the system; the lubrication station is eliminated to avoid bevel gear tooth failure. It saves maintenance costs, extends the working cycle of the equipment, and has a streamlined structure. Therefore, by adopting a permanent magnet synchronous direct-drive motor 16, it can solve application problems such as heavy-load starting, power balance, data acquisition and comprehensive protection, increase production capacity, and reduce energy consumption. It has good compatibility and can be used in conjunction with existing equipment, and can also complete the work independently. It has good network expansion performance and can realize on-site data recording and transmission, local automatic control, and can also access the network to realize data sharing and remote control, and finally realize intelligent control.

[0024] The permanent magnet synchronous motor adopts closed-loop vector control, which can achieve soft start and stop, low speed and high torque output. During the equipment start-up and operation, it can achieve slow start and stop, uniform load, and fundamentally solve the heavy load start problem that cannot be solved by asynchronous motor start-up. The system startup speed regulation curve adopts an optimized "S-type" start-up method and a multi-stage speed regulation start-up strategy, which has targeted solutions to traditional equipment problems such as improving the damage of related connected equipment.

[0025] The permanent magnet synchronous direct drive motor uses high-efficiency permanent magnet materials, eliminating the rotor excitation winding, saving the excitation winding power loss, and effectively improving the motor efficiency and power factor; the equipment adopts direct drive mode, eliminating the inefficient and complex mechanical transmission system, greatly improving the system efficiency, and the energy saving effect is significant, and the equipment is more low-carbon and environmentally friendly. Although the price of the permanent magnet direct drive system is slightly higher than that of the traditional drive mode, its ultra-high performance indicators, relatively small footprint and extremely low maintenance workload greatly improve its cost-effectiveness, significant additional effects, and can reduce the company's operating costs for production equipment.

[0026] The permanent magnet direct drive system uses a low-speed, high-torque permanent magnet synchronous motor to connect with the thrust bearing assembly of the coal mill to form a permanent magnet direct drive system. Since the permanent magnet motor itself has a high efficiency and eliminates the transmission structure such as the reducer, the permanent magnet direct drive system can greatly improve the system efficiency, reduce mechanical loss, reduce the size of the equipment, reduce the amount of equipment maintenance, and greatly reduce the many problems of equipment vibration and noise, thereby improving the on-site production environment.

[0027] A collecting barrel 5 is placed in the box body 1, and a filter screen 3 is fixedly connected to the upper end of the box body 1. The discharge port of the grinding mill body 15 is fixedly connected to a feeding pipe 4, and one end of the feeding pipe 4 passes through the filter screen 3 and extends into the box body 1. The powder discharged from the discharge port of the grinding mill body 15 will be transported to the collecting barrel 5 pre-placed in the box body 1 through the feeding pipe 4. The filter screen 3 can not only prevent the powder in the box body 1 from drifting into the outside air, but also ensure the circulation of air inside the box body 1 during the process of transporting the powder to the collecting barrel 5. When the collecting barrel 5 has collected the powder, the powder is stopped from being transported, and the box door 2 on one side of the box body 1 is opened to directly take out the collecting barrel 5. This not only facilitates the collection of the powder produced by the grinding mill body 15, but also prevents the powder from drifting into the outside air to cause waste of materials and dust pollution to the air environment.

[0028] Example 2

[0029] Reference Figure 1-5 As another preferred embodiment of the utility model, the difference from the embodiment 1 is that a through hole 17 is opened through the outer wall of the box body 1, a first cylinder 6 is fixedly connected to one side of the box body 1, a bracket 7 is fixedly connected to one end of the first cylinder 6, and the bracket 7 runs through the through hole 17, and a plurality of third cylinders 12 are fixedly connected to both sides of the inner wall of the bracket 7 at equal intervals, and a plurality of support bars 13 are fixedly connected to one end of the third cylinders 12, and the two support bars 13 are arranged opposite to each other, and the two support bars 13 are respectively provided with arc grooves arranged symmetrically, which facilitates the support of the sealing cover 11; when the powder is transported to the collecting barrel 5, After the material is collected, the first cylinder 6 is started to push the bracket 7 to move toward the side of the collecting barrel 5, and the bracket 7 drives several third cylinders 12 and two support bars 13 to move toward the side of the collecting barrel 5, and the two support bars 13 drive the sealing cover 11 placed thereon to move toward the side of the collecting barrel 5, until the sealing cover 11 is moved to the top of the collecting barrel 5, and then, several third cylinders 12 are started to make the two support bars 13 put down the sealing cover 11, and the sealing cover 11 will directly fall to cover the opening at the upper end of the collecting barrel 5, thereby sealing the collecting barrel 5 with collected powder, avoiding the leakage of powder inside the collecting barrel 5 and causing material loss.

[0030] A sealing plate 18 is fixedly connected to one end of the bracket 7 away from the first cylinder 6, and the sealing plate 18 is located in the box body 1. During the process of conveying powder into the collecting barrel 5, the sealing plate 18 always blocks the through opening 17 to seal it, thereby preventing the powder in the box body 1 from leaking out of the through opening 17 during the conveying process, causing material waste and dust pollution to the air environment.

[0031] A baffle 8 is fixedly connected inside the bracket 7, and a storage barrel 9 is fixedly connected to one side of the box body 1. Multiple sealing covers 11 are stacked in sequence from bottom to top in the storage barrel 9. When the first cylinder 6 is started to move a sealing cover 11 to the top of the collecting barrel 5, the bracket 7 will move to the lower end of the storage barrel 9 with the baffle 8, and the baffle 8 will block the opening at the lower end of the storage barrel 9 to prevent multiple unused sealing covers 11 in the storage barrel 9 from falling off; and when the collecting barrel 5 has collected the powder and covered the collecting barrel 5 with the sealing cover 11, the first cylinder 6 is started to drive the bracket 7 back to the initial position, the baffle 8 will also return to the initial position, the opening at the lower end of the storage barrel 9 will be opened, and a sealing cover 11 in the storage barrel 9 will fall onto the two support bars 13 again, thereby facilitating the feeding process of the sealing cover 11 and facilitating the continuous collection of the powder.

[0032] A second cylinder 10 is fixedly connected to the upper surface of the filter screen 3, and the lower end of the second cylinder 10 penetrates into the box body 1 and is fixedly connected to a pressure block 14, and the pressure block 14 is located directly above the collecting cylinder 5. When the sealing cover 11 falls to the opening at the upper end of the collecting cylinder 5, the second cylinder 10 is started to drive the pressure block 14 to move downward, and the pressure block 14 will completely press the sealing cover 11 into the opening at the upper end of the collecting cylinder 5, so that the collecting cylinder 5 with collected powder can be completely sealed, thereby enhancing its sealing performance and preventing leakage of powder inside the collecting cylinder 5.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vertical mill, comprising a housing (1), wherein the housing (1) is arranged on one side of a mill body (15), characterized in that: The lower end of the grinding mill body (15) is fixedly connected to a permanent magnet synchronous direct drive motor (16); a collecting cylinder (5) is placed in the box body (1); a filter screen (3) is fixedly connected to the upper end of the box body (1); a material outlet of the grinding mill body (15) is fixedly connected to a material delivery pipe (4); and one end of the material delivery pipe (4) passes through the filter screen (3) and extends into the box body (1).

2. The vertical grinding mill according to claim 1, characterized in that The outer wall of the box body (1) is penetrated with a through hole (17); a first cylinder (6) is fixedly connected to one side of the box body (1); one end of the first cylinder (6) is fixedly connected to a bracket (7), and the bracket (7) passes through the through hole (17); a plurality of third cylinders (12) are fixedly connected at equal intervals on both sides of the inner wall of the bracket (7); one end of each of the plurality of third cylinders (12) is fixedly connected to a support bar (13), and two of the support bars (13) are arranged opposite to each other.

3. The vertical grinding mill according to claim 2, characterized in that: A sealing plate (18) is fixedly connected to one end of the bracket (7) away from the first cylinder (6), and the sealing plate (18) is located inside the box body (1).

4. The vertical grinding mill according to claim 2, characterized in that: The two support bars (13) are respectively provided with symmetrically arranged arc grooves.

5. The vertical grinding mill according to claim 3, characterized in that: A baffle (8) is fixedly connected inside the bracket (7), and a storage cylinder (9) is fixedly connected to one side of the box body (1).

6. The vertical grinding mill according to claim 1, characterized in that: The upper surface of the filter screen (3) is fixedly connected to a second cylinder (10), the lower end of the second cylinder (10) penetrates into the box body (1) and is fixedly connected to a pressure block (14), and the pressure block (14) is located directly above the collection cylinder (5).

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