Vertical mill raw material feeding system and control method

Abstract

The invention relates to the technical field of vertical mill raw material feeding equipment, in particular to a vertical mill raw material feeding system and a control method. Through cooperation of the wear-resistant discharging hopper and the spiral conveyor, raw materials can be fed into the center of a millstone of the vertical mill to be milled, more uniform material distribution is achieved, then the grinding efficiency is improved, the phenomena of raw material adhesion and caking caused by the adoption of a traditional discharging chute are avoided, and the vertical mill can be effectively prevented from stopping due to material breakage; the material blocking sensor and the vibration motor are installed on the discharging hopper, automatic material blocking detection can be achieved, and raw materials are prevented from being accumulated in the discharging hopper; meanwhile, the automatic lubricating oil pump is arranged and matched with the lubricating oil pipe, so that automatic lubrication of each bearing can be realized, the service life of equipment is prolonged, and continuous and stable production of the vertical mill is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vertical mill raw material feeding equipment, and in particular to a vertical mill raw material feeding system and a control method. Background Art

[0002] Vertical mill is a large-scale grinding equipment, which is widely used in cement, electric power, metallurgy, chemical industry, non-metallic minerals and other industries. It integrates crushing, drying, grinding, grading and conveying, has high production efficiency, and can grind block, granular and powdered raw materials into required powdered materials.

[0003] From the working principle of the vertical mill, we can know that the best feeding position of the vertical mill is the center of the grinding disc of the vertical mill. At this time, the material will be distributed more evenly under the action of the centrifugal force generated by the rotation of the grinding disc of the vertical mill, thereby achieving higher grinding efficiency.

[0004] At present, the raw materials of the existing vertical mill first enter the rotary feeder through the mill belt, and then reach the angled discharge chute in the vertical mill after passing through the rotary feeder, and finally reach the center of the vertical mill grinding disc through the discharge chute for grinding. However, during the long-term use of the raw material feeding scheme of the existing technology, the raw materials will stick and agglomerate due to various reasons, and then get stuck in the rotary feeder or the discharge chute, resulting in poor movement of the raw materials. In addition, the discharge chute is inside the vertical mill and cannot be manually cleared during production, which eventually blocks the rotary feeder or the discharge chute, causing the vertical mill to stop due to material shortage. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a vertical mill raw material feeding system and a control method are provided, which can effectively avoid material jamming during the raw material feeding process and ensure continuous and stable production of the vertical mill.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] 1. A vertical mill raw material feeding system

[0008] The present invention provides a vertical mill raw material feeding system, comprising a wear-resistant lower hopper 2 and a screw conveyor 5, wherein the top inlet of the wear-resistant lower hopper 2 is located directly below the output end of the feeding belt conveyor 1, and the bottom outlet of the wear-resistant lower hopper 2 is connected to the feeding port of the screw conveyor 5, and the screw conveyor 5 is installed on a platform bracket 9, and the discharge port of the screw conveyor 5 is directly opposite to the center of the grinding disc of the vertical mill.

[0009] Furthermore, a material blocking sensor 3 and a vibration motor 4 are respectively installed at the middle and lower parts of the outer wall of the wear-resistant lower hopper 2 , and the material blocking sensor 3 is electrically connected to the vibration motor 4 .

[0010] Furthermore, a driving motor 7 is installed on the platform bracket 9 on the side of the screw conveyor 5 , and the driving motor 7 is connected to the central axis of the conveying blades of the screw conveyor 5 through a reducer 6 .

[0011] Furthermore, an automatic lubricating oil pump 10 is fixedly installed on the upper wall of the screw conveyor 5 , and the automatic lubricating oil pump 10 is connected to the bearing seat in the screw conveyor 5 through a lubricating oil pipe 11 .

[0012] Furthermore, a prefabricated time relay module is provided in the automatic lubricating oil pump 10 .

[0013] Furthermore, a plurality of elastic connecting blocks 8 are evenly arranged between the screw conveyor 5 and the platform support 9 .

[0014] Furthermore, the wear-resistant lower hopper 2 is fixedly connected to the top of the screw conveyor 5 through a mounting bracket, and the bottom outlet of the wear-resistant lower hopper 2 is connected to the top feed port of the screw conveyor 5 .

[0015] Furthermore, the mill conveyor belt 1, the material blocking sensor 3, the vibration motor 4, the drive motor 7, and the automatic lubricating oil pump 10 are all electrically connected to the mill system controller.

[0016] 2. A control method for the raw material feeding system of a vertical mill

[0017] Based on the same inventive concept, the present invention also provides a control method for the vertical mill raw material feeding system as described above, which specifically comprises the following steps:

[0018] S1, raw material unloading and screw conveying: the raw material falls into the wear-resistant unloading hopper 2 through the grinding belt conveyor 1, and enters the screw conveyor 5 through the wear-resistant unloading hopper 2. The driving motor 7 drives the central axis of the blade of the screw conveyor 5 to rotate, and the raw material is conveyed to the center of the vertical mill grinding disc;

[0019] S2, automatic detection of material blockage in the lower hopper: the material blockage sensor 3 is used to monitor in real time whether there is material blockage in the middle of the wear-resistant lower hopper 2. If the material blockage time exceeds the preset time T1, the vibration motor 4 is started to vibrate the lower hopper to speed up the passage of raw materials. If the material blockage is over, the vibration motor 4 is stopped;

[0020] S3, drive motor interlock control: the speed V of the drive motor 7 satisfies the following formula:

[0021] V>V0×K×C1×C2

[0022] Wherein, V0 is the running speed of the grinding belt conveyor, K is the speed ratio coefficient between the grinding belt conveyor and the screw conveyor, C1 is the speed correction coefficient related to the size of the lower hopper, and C2 is the speed correction coefficient related to the blade size of the screw conveyor.

[0023] S4, the lubricating oil pump is operated regularly: the automatic lubricating oil pump 10 periodically delivers lubricating oil to the bearings in the screw conveyor 5 according to a preset time interval T0.

[0024] Furthermore, if the material blocking time exceeds the preset time T2, T2>T1, the operation of the grinding belt conveyor 1 and the driving motor 7 are stopped at the same time to prevent the equipment from being damaged due to material blocking.

[0025] Compared with the prior art, the present invention has the following main advantages:

[0026] 1. The invention can feed the raw materials into the center of the vertical mill grinding disc for grinding by cooperating with the wear-resistant material discharge hopper and the screw conveyor, so as to achieve more uniform material distribution, thereby improving the grinding efficiency, and avoiding the raw material adhesion and agglomeration caused by the traditional material discharge chute, which can effectively prevent the vertical mill from stopping due to material shortage;

[0027] 2. The present invention can realize automatic detection of material blockage by installing a material blockage sensor and a vibration motor on the lower hopper to prevent raw materials from accumulating in the lower hopper; at the same time, by providing an automatic lubricating oil pump and cooperating with a lubricating oil pipe, automatic lubrication of each bearing can be realized, thereby increasing the service life of the equipment and ensuring continuous and stable production of the vertical mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of a vertical mill raw material feeding system in an embodiment of the present invention;

[0029] Figure 2 Flow chart of the control method in an embodiment of the present invention.

[0030] In the figure: 1-grinding belt conveyor, 2-wear-resistant lower hopper, 3-blocking sensor, 4-vibration motor, 5-screw conveyor, 6-reducer, 7-driving motor, 8-elastic connecting block, 9-platform bracket, 10-automatic lubricating oil pump, 11-lubricating oil pipe. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0033] Embodiment 1: This embodiment provides a vertical mill raw material feeding system, such as Figure 1 As shown, it mainly includes: a wear-resistant lower hopper 2 and a screw conveyor 5. The top inlet of the wear-resistant lower hopper 2 is located just below the output end of the grinding belt conveyor 1, and the bottom outlet of the wear-resistant lower hopper 2 is connected to the feed port of the screw conveyor 5. The screw conveyor 5 is installed on a platform bracket 9, and the discharge port of the screw conveyor 5 is just opposite to the center of the grinding disc of the vertical mill.

[0034] Furthermore, a material blocking sensor 3 and a vibration motor 4 are respectively installed at the middle and lower parts of the outer wall of the wear-resistant lower hopper 2 , and the material blocking sensor 3 is electrically connected to the vibration motor 4 .

[0035] Furthermore, a driving motor 7 is installed on the platform bracket 9 on the side of the screw conveyor 5 , and the driving motor 7 is connected to the central axis of the conveying blades of the screw conveyor 5 through a reducer 6 .

[0036] Furthermore, an automatic lubricating oil pump 10 is fixedly installed on the upper wall of the screw conveyor 5 , and the automatic lubricating oil pump 10 is connected to the bearing seat in the screw conveyor 5 through a lubricating oil pipe 11 .

[0037] Furthermore, a prefabricated time relay module is provided in the automatic lubricating oil pump 10 .

[0038] Furthermore, a plurality of elastic connecting blocks 8 are evenly arranged between the screw conveyor 5 and the platform support 9 .

[0039] Furthermore, the wear-resistant lower hopper 2 is fixedly connected to the top of the screw conveyor 5 through a mounting bracket, and the bottom outlet of the wear-resistant lower hopper 2 is connected to the top feed port of the screw conveyor 5 .

[0040] Furthermore, the mill conveyor belt 1, the material blocking sensor 3, the vibration motor 4, the drive motor 7, and the automatic lubricating oil pump 10 are all electrically connected to the mill system controller.

[0041] Embodiment 2: This embodiment provides a vertical mill raw material feeding system. When the raw material on the mill belt 1 enters the screw conveyor 5 through the wear-resistant discharge hopper 2, the motor 7 drives the reducer 6 to rotate, thereby driving the central axis of the screw conveyor 5 to rotate, and bringing the raw material into the center of the vertical mill grinding disc, avoiding the raw material from being stuck in the original rotary feeder and the discharge chute, ensuring that the vertical mill can produce continuously and achieve the purpose of stable and reliable operation.

[0042] When the wear-resistant lower hopper 2 is blocked, the blocking sensor 3 is triggered, and a signal is sent through the blocking sensor 3 to automatically start the vibration motor 4, accelerate the passage of raw materials by vibration, and alarm the control personnel to prevent the raw materials from accumulating in the wear-resistant lower hopper 2 and being unable to enter the screw conveyor 5, causing material shortage and shutdown.

[0043] When the screw conveyor 5 is running, the automatic dry oil pump 10 delivers lubricating oil to the bearing of the screw conveyor 5 through the dry oil pipe 11. The automatic dry oil pump 10 runs for 5 minutes every hour to ensure continuous delivery of lubricating oil to the bearing.

[0044] Furthermore, an elastic connection block 8 is added between the screw conveyor 5 and the platform bracket 9 to prevent the connection between the screw conveyor 5 and the platform bracket 9 from breaking due to vibration caused by long-term production of the vertical mill.

[0045] Embodiment 3, based on the same inventive concept, this embodiment also provides a control method for the vertical mill raw material feeding system as described above, such as Figure 2 As shown, the specific steps include:

[0046] S1, raw material unloading and screw conveying: the raw material falls into the wear-resistant unloading hopper 2 through the grinding belt conveyor 1, and enters the screw conveyor 5 through the wear-resistant unloading hopper 2. The driving motor 7 drives the central axis of the blade of the screw conveyor 5 to rotate, and the raw material is conveyed to the center of the vertical mill grinding disc;

[0047] S2, automatic detection of material blockage in the lower hopper: the material blockage sensor 3 is used to monitor in real time whether there is material blockage in the middle of the wear-resistant lower hopper 2. If the material blockage time exceeds the preset time T1, the vibration motor 4 is started to vibrate the lower hopper to speed up the passage of raw materials. If the material blockage is over, the vibration motor 4 is stopped;

[0048] S3, drive motor interlock control: the speed V of the drive motor 7 satisfies the following formula:

[0049] V>V0×K×C1×C2

[0050] Wherein, V0 is the running speed of the grinding belt conveyor, K is the speed ratio coefficient between the grinding belt conveyor and the screw conveyor, C1 is the speed correction coefficient related to the size of the lower hopper, and C2 is the speed correction coefficient related to the blade size of the screw conveyor.

[0051] S4, the lubricating oil pump is operated regularly: the automatic lubricating oil pump 10 periodically delivers lubricating oil to the bearings in the screw conveyor 5 according to a preset time interval T0.

[0052] Furthermore, if the material blocking time exceeds the preset time T2, T2>T1, the operation of the grinding belt conveyor 1 and the driving motor 7 are stopped at the same time to prevent the equipment from being damaged due to material blocking.

[0053] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0054] In summary:

[0055] 1. The invention can feed the raw materials into the center of the vertical mill grinding disc for grinding by cooperating with the wear-resistant material discharge hopper and the screw conveyor, so as to achieve more uniform material distribution, thereby improving the grinding efficiency, and avoiding the raw material adhesion and agglomeration caused by the traditional material discharge chute, which can effectively prevent the vertical mill from stopping due to material shortage;

[0056] 2. The present invention can realize automatic detection of material blockage by installing a material blockage sensor and a vibration motor on the lower hopper to prevent raw materials from accumulating in the lower hopper; at the same time, by providing an automatic lubricating oil pump and cooperating with a lubricating oil pipe, automatic lubrication of each bearing can be realized, thereby increasing the service life of the equipment and ensuring continuous and stable production of the vertical mill.

[0057] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical mill raw material feeding system, characterized in that: The invention comprises a wear-resistant lower hopper (2) and a screw conveyor (5), wherein the top inlet of the wear-resistant lower hopper (2) is located directly below the output end of the grinding belt conveyor (1), the bottom outlet of the wear-resistant lower hopper (2) is connected to the feed port of the screw conveyor (5), the screw conveyor (5) is installed on a platform bracket (9), and the discharge port of the screw conveyor (5) is directly opposite to the center of the grinding disc of the vertical mill.

2. A vertical mill raw material feeding system according to claim 1, characterized in that: A material blocking sensor (3) and a vibration motor (4) are respectively installed at the middle and lower parts of the outer wall of the wear-resistant lower hopper (2), and the material blocking sensor (3) is electrically connected to the vibration motor (4).

3. A vertical mill raw material feeding system according to claim 2, characterized in that: A driving motor (7) is installed on the platform bracket (9) on the side of the screw conveyor (5), and the driving motor (7) is connected to the central axis of the conveying blades of the screw conveyor (5) through a reducer (6).

4. A vertical mill raw material feeding system according to claim 3, characterized in that: An automatic lubricating oil pump (10) is fixedly mounted on the upper wall of the screw conveyor (5), and the automatic lubricating oil pump (10) is connected to a bearing seat in the screw conveyor (5) via a lubricating oil pipe (11).

5. A vertical mill raw material feeding system according to claim 4, characterized in that: A prefabricated time relay module is arranged inside the automatic lubricating oil pump (10).

6. A vertical mill raw material feeding system according to claim 3, characterized in that: A plurality of elastic connection blocks (8) are evenly arranged between the screw conveyor (5) and the platform support (9).

7. A vertical mill raw material feeding system according to claim 1, characterized in that: The wear-resistant lower hopper (2) is specifically fixedly connected to the top of the screw conveyor (5) via a mounting bracket, and the bottom outlet of the wear-resistant lower hopper (2) is connected to the top feed port of the screw conveyor (5).

8. A vertical mill raw material feeding system according to claim 4, characterized in that: The milling belt conveyor (1), the material blocking sensor (3), the vibration motor (4), the drive motor (7), and the automatic lubricating oil pump (10) are all electrically connected to the milling system controller.

9. A method for controlling a vertical mill raw material feeding system as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, raw material discharge and screw conveying: the raw material falls into the wear-resistant discharge hopper (2) through the grinding belt conveyor (1), and enters the screw conveyor (5) through the wear-resistant discharge hopper (2). The driving motor (7) drives the central axis of the blade of the screw conveyor (5) to rotate, and the raw material is conveyed to the center of the grinding disc of the vertical mill; S2, automatic detection of material blockage in the lower hopper: a material blockage sensor (3) is used to monitor in real time whether a material blockage occurs in the middle of the wear-resistant lower hopper (2). If the material blockage time exceeds a preset time T1, a vibration motor (4) is started to vibrate the lower hopper to speed up the passage of raw materials. If the material blockage is over, the vibration motor (4) is stopped; S3, drive motor interlock control: the speed V of the drive motor (7) satisfies the following formula: V>V0×K×C1×C2 Wherein, V0 is the running speed of the grinding belt conveyor, K is the speed ratio coefficient between the grinding belt conveyor and the screw conveyor, C1 is the speed correction coefficient related to the size of the lower hopper, and C2 is the speed correction coefficient related to the blade size of the screw conveyor. S4, lubricating oil pump timed operation: the automatic lubricating oil pump (10) periodically delivers lubricating oil to the bearings in the screw conveyor (5) at a preset time interval T0.

10. The control method according to claim 9, characterized in that: If the material blocking time exceeds the preset time T2, T2>T1, the operation of the grinding belt conveyor (1) and the driving motor (7) are stopped simultaneously.

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