Uniform distributor for large-size mills and method of distribution

Abstract

The present application relates to the technical field of mill equipment, in particular to a uniform distributor for large-scale mill and a distribution method, which comprises a distribution baffle horizontally arranged above the center of the mill disc; a driving device comprising a pair of servo motors and an absolute value encoder mounted on the top shell of the mill; a threaded lifting rod movably connected between the output shaft of the servo motor and the distribution baffle; a control system electrically connected with the driving device; and the absolute value encoder is used for real-time detection of the rotation angle of the output shaft of the servo motor and feedback of the detection signal to the control system. The distribution baffle with the distribution disc and the material stirring table is arranged to complete the double fine flattening of the material in the radial direction and the circumferential direction, so as to significantly improve the uniformity of the distribution. The servo motor is used to drive the threaded lifting rod, and the absolute value encoder is used to form an indirect lifting control system, so as to complete the accurate control of the height of the distribution baffle and dynamically adapt to the change of the material layer thickness.

Description

Technical Field

[0001] This invention relates to the field of grinding mill equipment technology, specifically to a uniform feeder and feeding method for a large grinding mill. Background Technology

[0002] In industries such as cement, power, and steel, large-scale grinding mills are core equipment for material crushing. Their conventional workflow is as follows: material is fed from the center of the grinding disc, and the centrifugal force of the rotating disc propels the material to the working area of ​​the surrounding grinding rollers for crushing. However, the initial uniformity of the material distribution at the center of the grinding disc is crucial.

[0003] Existing technologies generally suffer from uneven material distribution when fed into the center of the grinding disc, often leading to material accumulation in one direction. This unevenness is amplified when the material is thrown out by centrifugal force, causing uneven feeding of the grinding rollers. Over long-term operation, the rollers receiving more material will wear out first, not only reducing the overall stability and production efficiency of the equipment but also significantly increasing maintenance costs and energy consumption.

[0004] To address the aforementioned issues, existing technologies have employed a fixed material distributor installed at the center of the grinding disc. This distributor uses a fixed baffle to block and initially level the falling material. However, this fixed material distributor has significant drawbacks: its height is not adjustable, making it unsuitable for varying material characteristics such as particle size, moisture content, feed rate, and mill operating conditions. When the material layer is too thick, it easily leads to accumulation; when it is too thin, the leveling effect is poor. Therefore, developing a material distributor that can dynamically adapt to operating conditions, precisely control the material distribution height, and operate reliably has become a pressing technical problem in this field. Summary of the Invention

[0005] To overcome the deficiencies in the prior art, the present invention aims to provide a uniform material distributor and material distribution method for large mills. By setting a material distribution baffle with a material distribution disc and a material distribution table, the material is finely evenly distributed in both the radial and circumferential directions. By using a servo motor to drive a threaded lifting rod and cooperating with an absolute encoder to form an indirect lifting control system, the height of the material distribution baffle is precisely adjusted, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a uniform feeder for a large mill, comprising a feed baffle horizontally positioned above the center of the grinding disc, wherein the length of the feed baffle is less than the diameter of the grinding range enclosed by several grinding rollers.

[0007] A driving device is used to drive the fabric baffle to move up and down relative to the grinding disc surface; the driving device includes a pair of servo motors and an absolute encoder installed on the top shell of the mill; a threaded lifting rod is movably connected between the output shaft of the servo motor and the fabric baffle, and the height of the fabric baffle for smoothing the material is adjusted by the pair of threaded lifting rods driven by the servo motors.

[0008] The control system is electrically connected to the drive device; the absolute encoder is used to detect the rotation angle of the servo motor output shaft in real time and feeds the detection signal back to the control system to indirectly calculate the lifting displacement of the fabric baffle.

[0009] The control system is configured to precisely control the action of the drive device based on the feedback signal of the absolute encoder, so as to adjust and maintain the fabric baffle within a preset safe height range to prevent it from contacting the grinding disc or grinding roller.

[0010] The above setup places the absolute encoder in a clean environment outside the mill and indirectly calculates the height by detecting the rotation angle of the servo motor. This solves the problem of dust accumulation and malfunction of direct measurement sensors inside the mill, ensuring the long-term stability and reliability of the control.

[0011] As a further improvement to this technical solution, the cloth baffle is long and has a frustum-shaped cloth disc in the middle of its bottom surface, which is used to smooth the material piled up in the center of the grinding disc. The top surface of the cloth disc has a structure that is high in the center and low at the edges.

[0012] As a further improvement to this technical solution, the bottom sides of the long side of the cloth baffle are provided with material-pushing platforms for spreading out the material piled up outside the center of the grinding disc. The material-pushing platforms are triangular prism structures.

[0013] The above setup uses a central conical material distribution plate to smooth and disperse the material piled up in the center, while the triangular prism-shaped material feeding platforms on both sides further flatten the spread material. The two work together to ensure that the material is evenly distributed on the entire working surface of the grinding disc, making the feeding of each grinding roller consistent and greatly extending the overall service life of the grinding roller.

[0014] As a further improvement to this technical solution, the lower end of the threaded lifting rod is hinged with a lifting clamp, and the lifting clamp is slidably engaged with the top of the fabric baffle.

[0015] As a further improvement to this technical solution, the top two long sides of the fabric baffle are symmetrically provided with sliding grooves, and the two inner sides of the lifting clamp are symmetrically provided with sliding ribs, which are slidably inserted into the sliding grooves.

[0016] As a further improvement to this technical solution, the output shaft end of the servo motor is coaxially connected to a threaded sleeve, and the threaded sleeve is threadedly connected to the threaded lifting rod.

[0017] As a further improvement to this technical solution, the top of the fabric baffle is provided with a material distribution platform with angular protrusions.

[0018] As a further improvement to this technical solution, the upper end of the threaded sleeve is fitted with a bearing, and the bearing is embedded in the top shell of the mill.

[0019] As a further improvement to this technical solution, the control system is also configured to receive the operating parameters of the mill and dynamically adjust the preset height of the material distribution baffle according to the operating parameters; the operating parameters include at least one of the following: mill output, feed rate, mill disc speed, material thickness, and material type.

[0020] On the other hand, the present invention provides a method for feeding material using a uniform feeder for a large mill, comprising the following steps:

[0021] S1. Start a pair of servo motors to drive a pair of threaded lifting rods to descend along their axis, thereby causing the fabric baffle to lower its contact with the material;

[0022] S2. When the grinding disc of the mill is rotating, the height of the cloth baffle from the grinding disc is indirectly obtained in real time through an absolute encoder.

[0023] S3. Obtain the real-time operating parameters of the mill through the control system, and determine the working height of the material distribution baffle based on the operating parameters;

[0024] S4. The control system controls the drive device to operate, and based on the real-time feedback from the absolute encoder, precisely adjusts and maintains the fabric baffle at the working height.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This large mill uses a uniform material distributor and material distribution method. By setting up a material distribution baffle with a material distribution plate and a material distribution table, it achieves double fine flattening of the material in both the radial and circumferential directions, thereby significantly improving the uniformity of material distribution and fundamentally solving the problem of uneven wear of the grinding rollers.

[0027] 2. The large mill uses a uniform material distributor and material distribution method. By employing a servo motor to drive the threaded lifting rod and in conjunction with an absolute encoder to form an indirect lifting control system, it achieves precise and reliable closed-loop control of the height of the material distribution baffle. This achieves the technical effect of dynamically adapting to changes in material layer thickness while completely avoiding contamination or damage to the sensors inside the mill.

[0028] 3. The large mill uses a uniform material distributor and material distribution method. Through the sliding engagement of the lifting clamp and the chute, as well as the inclined arrangement of the threaded lifting rod, the flexible connection and space optimization of the material distribution baffle and the drive mechanism are achieved. This achieves the technical effect of cleverly avoiding the working area of ​​the grinding roller and reserving sufficient space for expanding the top feeding port of the mill.

[0029] 4. The large mill uses a uniform material distributor and material distribution method. By integrating various operating parameters of the mill into the control system, it achieves adaptive intelligent decision-making on the material distribution height, thereby ensuring that the material distributor is always in the best working state and further optimizing the mill's production efficiency and energy consumption. Attached Figure Description

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, will select various possible shapes and proportions to implement the invention according to specific circumstances.

[0031] Figure 1 This is a schematic diagram of the overall structure of the mill of the present invention;

[0032] Figure 2 This is a schematic diagram of the grinding disc, grinding rollers, and material in the mill of the present invention;

[0033] Figure 3 This is a schematic diagram of the fabric baffle assembly structure of the present invention;

[0034] Figure 4 For the present invention Figure 3 The main view;

[0035] Figure 5 For the present invention Figure 4 Side view;

[0036] Figure 6 This is a split view of the fabric baffle of the present invention;

[0037] The meanings of the labels in the diagram are as follows:

[0038] 100. Fabric baffle; 110. Fabric tray; 120. Material feeding table; 130. Material separating table; 140. Slide chute;

[0039] 200. Threaded lifting rod;

[0040] 300. Lifting clamp; 310. Slip rib;

[0041] 400. Servo motor; 410. Threaded sleeve; 420. Absolute encoder. Detailed Implementation

[0042] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art will conceive of any possible variations of the invention, all of which should be considered within the scope of the invention. The terms "installation" and "connection" should be interpreted broadly, referring to direct connection as well as indirect connection through an intermediate medium.

[0043] The terms "central axis," "vertical," "horizontal," "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0044] Please see Figures 1-6 As shown, the present invention provides a uniform feeder for a large mill, including a feed baffle 100, a drive device and a control system; the feed baffle 100 is horizontally placed above the center of the grinding disc, and the length of the feed baffle 100 is less than the diameter of the grinding range enclosed by several grinding rollers; to avoid contact and interference with the grinding rollers.

[0045] Furthermore, the fabric baffle 100 is elongated and has a frustum-shaped fabric disc 110 at the center of its bottom surface, used to smooth out material accumulated in the center of the grinding disc. The top surface of the fabric disc 110 has a structure that is higher in the center and lower at the edges, so that material that falls or accumulates on the top surface of the fabric disc 110 can slide off on its own, avoiding material retention. The fabric baffle 100 is made of wear-resistant steel plate, making it durable and extending the maintenance cycle of the fabric baffle 100.

[0046] Furthermore, both sides of the bottom of the long side of the fabric baffle 100 are provided with a material feeding platform 120, which is used to flatten the material piled up outside the center of the grinding disc. The material feeding platform 120 has a triangular prism structure. The rotation of the grinding disc causes the material to be flattened and dispersed by the fabric plate 110. Then, with the help of the material feeding platform 120, the piled material is pushed away, so that under the action of the rotation force of the grinding disc, the material is evenly distributed in all directions, so that the grinding rollers are fed evenly and the overall life of the grinding rollers is extended.

[0047] Furthermore, the top of the material baffle 100 is provided with a angular protruding distribution platform 130; so that when the material is injected from the top of the mill, the material falls to the top of the material baffle 100 and slides off the distribution platform 130 by itself, avoiding retention.

[0048] Specifically, as the height of the accumulated material decreases as the grinding disc rotates, the height of the fabric baffle 100 needs to be adjusted in real time to continuously smooth out the lowered material. A drive unit is used to drive the fabric baffle 100 to move up and down relative to the grinding disc surface. The drive unit includes a pair of servo motors 400 and an absolute encoder 420 mounted on the top shell of the mill. A threaded lifting rod 200 is movably connected between the output shaft of the servo motor 400 and the fabric baffle 100. The height of the fabric baffle 100 used to smooth the material is adjusted by the lifting rod 200, driven by the servo motors 400. The control system accurately calculates the linear displacement of the threaded lifting rod 200 by reading the number of rotations and angle of the absolute encoder 420, and then calculates the real-time height of the fabric baffle 100. This is an indirect measurement method, completely avoiding the dust accumulation, vibration, and high-temperature damage encountered with sensors that directly measure the position, thus simplifying maintenance.

[0049] Furthermore, a lifting clamp 300 is hinged to the lower end of the threaded lifting rod 200, and the lifting clamp 300 is slidably engaged with the top of the fabric baffle 100; the top two long sides of the fabric baffle 100 are symmetrically provided with sliding grooves 140, and the two inner sides of the lifting clamp 300 are symmetrically provided with sliding ribs 310, which are slidably inserted into the corresponding sliding grooves 140; this allows the threaded lifting rod 200 to slide and lift the fabric baffle 100 up and down through the lifting clamp 300, thereby avoiding the working area of ​​several grinding rollers by tilting the threaded lifting rod 200, and also makes the installation position of the servo motor 400 far away from the top of the mill's feeding port, which is conducive to expanding the feeding port diameter and quickly injecting materials.

[0050] Furthermore, the output shaft of the servo motor 400 is coaxially connected to a threaded sleeve 410, which is threadedly connected to the threaded lifting rod 200. Since a pair of threaded lifting rods 200 are installed on the fabric baffle 100 for driving, and the rotation of the threaded lifting rods 200 is restricted by the lifting clamp 300 hinged to them, the threaded lifting rods 200 and the threaded sleeve 410 are ensured to extend and retract along their axial direction during the threaded rotational movement, thereby controlling the lifting and lowering of the fabric baffle 100. A bearing is fitted onto the upper end of the threaded sleeve 410 and embedded in the mill top shell, allowing the servo motor 400 to drive the threaded sleeve 410 to rotate freely. A sealing assembly is provided between the bearing and the hole in the mill top shell. This sealing assembly uses a flexible sealing sleeve to effectively prevent dust from escaping from inside the mill and maintain a clean external environment.

[0051] Specifically, the control system is electrically connected to the drive device; the absolute encoder 420 is used to detect the rotation angle of the output shaft of the servo motor 400 in real time and feeds the detection signal back to the control system to indirectly calculate the lifting displacement of the fabric baffle 100.

[0052] The control system is configured to precisely control the action of the drive device based on the feedback signal of the absolute encoder 420, so as to adjust and maintain the fabric baffle 100 within a preset safe height range to prevent it from contacting the grinding disc or grinding roller.

[0053] Furthermore, the control system is also configured to receive the mill's operating parameters and dynamically adjust the preset height of the material distribution baffle 100 based on these parameters. The operating parameters include at least one of the following: mill output, feed rate, mill disc speed, material thickness, and material type. By inputting these operating parameters into the central control unit of the control system, the system internally stores or calculates in real-time the optimal material distribution and smoothing height matching these parameters. Then, it sends a command to the servo motor 400 to drive the material distribution baffle 100 to rise and fall to the predetermined position to smooth the material, ensuring even distribution and preventing localized accumulation that would increase wear on the grinding rollers.

[0054] The feeding method of the uniform feeder for large mills of the present invention includes the following steps:

[0055] S1. Start a pair of servo motors 400 to drive a pair of threaded lifting rods 200 to descend along their axial direction, thereby driving the fabric baffle 100 to reduce its contact with the material;

[0056] S2. When the grinding disc of the mill is rotating, the height of the cloth baffle 100 from the grinding disc is indirectly obtained in real time through the absolute encoder 420.

[0057] S3. Obtain the real-time operating parameters of the mill through the control system, and determine the working height of the material distribution baffle 100 based on the operating parameters;

[0058] S4. The control system controls the drive device to operate and, based on the real-time feedback from the absolute encoder 420, precisely adjusts and maintains the fabric baffle 100 at the working height.

[0059] Example:

[0060] Taking the ZGM113G slag mill as an example. When processing slag with high moisture content, the material has poor flowability, requiring the height of the cloth baffle 100mm to be lowered to 150mm to enhance spreading force and prevent material accumulation. When processing dry raw material, which has good flowability, the cloth baffle 100mm is raised to 300mm to avoid excessive obstruction leading to material splashing. The control system automatically calls the preset height value based on the material type signal and drives the cloth baffle to its position. Through this adaptive adjustment, the mill's output within a maintenance cycle has increased from the original 94,000 tons to 102,000 tons, while the wear uniformity of the grinding rollers has improved by more than 15%.

[0061] It should be noted that the fixed connections and fixing methods of the present invention are achieved using conventional fixing means such as bolt connections or welding. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A uniform feeder for a large mill, characterized in that, Includes a fabric baffle that is horizontally positioned above the center of the grinding disc, wherein the length of the fabric baffle is less than the diameter of the grinding range enclosed by several grinding rollers; A driving device is used to drive the fabric baffle to move up and down relative to the grinding disc surface; the driving device includes a pair of servo motors and an absolute encoder installed on the top shell of the mill; a threaded lifting rod is movably connected between the output shaft of the servo motor and the fabric baffle, and the height of the fabric baffle for smoothing the material is adjusted by the pair of threaded lifting rods driven by the servo motors. The control system is electrically connected to the drive device; the absolute encoder is used to detect the rotation angle of the servo motor output shaft in real time and feeds the detection signal back to the control system to indirectly calculate the lifting displacement of the fabric baffle. The control system is configured to precisely control the action of the drive device based on the feedback signal of the absolute encoder, so as to adjust and maintain the fabric baffle within a preset safe height range. The fabric baffle is long and has a frustum-shaped fabric disc in the middle of its bottom surface, which is used to smooth the material piled up in the center of the grinding disc. The top surface of the fabric disc has a structure that is high in the center and low at the edges. The material baffle is provided with material spreading platforms on both sides of the bottom of the long side, which are used to spread the material piled up outside the center of the grinding disc. The material spreading platform has a triangular prism structure. The lower end of the threaded lifting rod is hinged to a lifting clamp, which is slidably engaged with the top of the fabric baffle.

2. The uniform feeder for large mills according to claim 1, characterized in that: The top two long sides of the fabric baffle are symmetrically provided with sliding grooves, and the two inner sides of the lifting clamp are symmetrically provided with sliding ribs, which are slidably inserted into the sliding grooves.

3. The uniform feeder for large mills according to claim 2, characterized in that: The output shaft of the servo motor is coaxially connected to a threaded sleeve, which is threadedly connected to the threaded lifting rod.

4. The uniform feeder for large mills according to claim 3, characterized in that: The top of the fabric baffle is provided with a material distribution platform with angular protrusions.

5. The uniform feeder for large mills according to claim 4, characterized in that: The upper end of the threaded sleeve is fitted with a bearing, which is embedded in the top shell of the mill.

6. The uniform feeder for large mills according to claim 5, characterized in that: The control system is also configured to receive the mill's operating parameters and dynamically adjust the preset height of the material distribution baffle according to the operating parameters; the operating parameters include at least one of the following: mill output, feed rate, mill disc speed, material thickness, and material type.

7. A method for feeding material using a uniform feeder for a large mill, comprising using the uniform feeder for a large mill according to claim 6, characterized in that, Includes the following steps: S1. Start a pair of servo motors to drive a pair of threaded lifting rods to descend along their axis, thereby causing the fabric baffle to lower its contact with the material; S2. When the grinding disc of the mill is rotating, the height of the cloth baffle from the grinding disc is indirectly obtained in real time through an absolute encoder. S3. Obtain the real-time operating parameters of the mill through the control system, and determine the working height of the material distribution baffle based on the operating parameters; S4. The control system controls the drive device to operate, and based on the real-time feedback from the absolute encoder, precisely adjusts and maintains the fabric baffle at the working height.

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