Uniform distributing device for large mill and distributing method

Abstract

The invention relates to the technical field of mill equipment, in particular to a uniform distributing device for a large mill and a distributing method. The driving device comprises a pair of servo motors and an absolute value encoder which are mounted on the mill top shell; a threaded lifting rod is movably connected between an output shaft of the servo motor and the cloth baffle. The control system is electrically connected with the driving device; the absolute value encoder is used for detecting the rotation angle of the output shaft of the servo motor in real time and feeding back a detection signal to the control system. By arranging the material distribution baffle with the material distribution disc and the material stirring table, double refined flattening of materials in the radial direction and the circumferential direction is completed, and the technical effect of remarkably improving the material distribution uniformity is achieved; the servo motor is adopted to drive the threaded lifting rod and is matched with the absolute value encoder to form an indirect lifting control system, so that the height of the cloth baffle is accurately controlled, and the technical effect of dynamically adapting to the thickness change of a material layer is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding mill equipment, in particular to a uniform material distributor for large grinding mill and a material distribution method. BACKGROUND

[0002] In the cement, power, steel and other industries, large grinding mill is the core equipment for material crushing. The conventional working process is: the material is discharged from the center of the grinding disc, and is thrown to the working area of the peripheral grinding roller by the centrifugal force of the rotating grinding disc for crushing. However, the initial uniformity of the material distribution at the center of the grinding disc is crucial.

[0003] The existing technology generally has the problem of uneven distribution of the material when it is discharged at the center of the grinding disc, which often causes the material to accumulate in a certain direction. When the material is thrown out by the centrifugal force, this unevenness is amplified, causing uneven feeding of each grinding roller. After long-term operation, the grinding roller with more material will wear out first, not only reducing the running stability and production efficiency of the entire equipment, but also significantly increasing the maintenance cost and energy consumption.

[0004] To solve the above problems, the existing technology has a scheme of installing a fixed material distributor at the center of the grinding disc, which blocks and preliminarily flattens the falling material by a fixed baffle. However, this fixed material distributor has obvious defects: its height is not adjustable, and it cannot adapt to different material characteristics such as particle size, humidity, feeding amount and grinding mill working conditions. When the material layer is too thick, it is easy to cause accumulation, and when it is too thin, the flattening effect is not good. Therefore, developing a material distributor that can dynamically adapt to the working conditions, accurately control the material distribution height and reliably operate has become a technical problem to be solved in the field. SUMMARY

[0005] In order to overcome the defects in the prior art, the purpose of the present application is to provide a uniform material distributor for large grinding mill and a material distribution method, which completes the double fine flattening of the material in the radial and circumferential directions by setting a material distribution baffle with a material distribution disc and a material stirring table, and completes the accurate adjustment of the height of the material distribution baffle by adopting a servo motor to drive a threaded lifting rod and cooperating with an absolute value encoder to form an indirect lifting control system, so as to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides a uniform material distributor for large grinding mill, which comprises a material distribution baffle horizontally arranged above the center of the grinding disc, the length value of the material distribution baffle is less than the diameter value of the grinding pressure range surrounded by several grinding rollers; A driving device is used to drive the material distribution baffle to make lifting motion relative to the surface of the grinding disc; the driving device comprises a pair of servo motors and an absolute value encoder mounted on the top shell of the grinding mill; the output shaft of the servo motor is movably connected with the threaded lifting rod of the material distribution baffle, and the height of the material distribution baffle for flattening the material is adjusted by lifting the pair of threaded lifting rods driven by the servo motor; The control system is electrically connected with the driving device; the absolute value encoder is used for detecting the rotation angle of the output shaft of the servo motor in real time and feeding back a detection signal to the control system, so as to indirectly calculate the lifting displacement of the cloth baffle; The control system is configured to accurately control the action of the driving device according to the feedback signal of the absolute value encoder, so as to adjust and maintain the cloth baffle in a preset safe height range, and avoid the cloth baffle from touching the grinding disc or the grinding roller.

[0007] The above arrangement places the absolute value encoder in a clean environment outside the mill, indirectly calculates the height by detecting the rotation angle of the servo motor, solves the problem that the direct measurement sensor is easy to accumulate dust and fail in the internal environment, and guarantees the long-term stability and reliability of the control.

[0008] As a further improvement of the technical solution, the cloth baffle is in a long plate shape, and a cloth disc in a circular truncated cone shape is arranged at the middle of the bottom surface of the cloth baffle, for flattening the material accumulated in the center of the grinding disc, and the top surface of the cloth disc is in a structure with the center being high and the edges being low.

[0009] As a further improvement of the technical solution, the cloth baffle is in a long plate shape, and a cloth disc in a circular truncated cone shape is arranged at the middle of the bottom surface of the cloth baffle, for flattening the material accumulated in the center of the grinding disc, and the top surface of the cloth disc is in a structure with the center being high and the edges being low.

[0010] The above arrangement flattens and disperses the material accumulated in the center to the periphery by the central conical cloth disc, and further flattens the diffused material by the three-prism-shaped material pushing tables on the two sides, and the two cooperate to ensure that the material is evenly distributed on the entire working surface of the grinding disc, so that the grinding rollers are uniformly fed, and the overall service life of the grinding rollers is greatly prolonged.

[0011] As a further improvement of the technical solution, the lower end of the threaded lifting rod is hingedly connected with a lifting clamping block, and the lifting clamping block is slidingly clamped with the top of the cloth baffle.

[0012] As a further improvement of the technical solution, the top of the cloth baffle is symmetrically provided with a sliding groove on the two long sides, and the two inner sides of the lifting clamping block are symmetrically provided with sliding ribs, which are slidingly inserted into the sliding groove.

[0013] As a further improvement of the technical solution, the output shaft end of the servo motor is coaxially connected with a threaded sleeve, and the threaded sleeve is threadedly sleeved with the threaded lifting rod.

[0014] As a further improvement of the technical solution, the top of the cloth baffle is provided with a material distribution table in a corner protrusion.

[0015] As a further improvement of the technical solution, the upper end of the threaded sleeve is sleeved with a bearing, and the bearing is embedded in the top shell of the mill.

[0016] As a further improvement of the technical solution, the control system is further configured to receive working condition parameters of the mill, and dynamically adjust the preset height of the material baffle according to the working condition parameters; the working condition parameters include at least one of mill output, feed amount, mill disc rotation speed, material thickness and material type.

[0017] In another aspect, the application provides a material distribution method of a uniform material distributor for a large mill, comprising the following steps: S1, a pair of servo motors are started to drive a pair of threaded lifting rods to descend along their axial direction, thereby driving the material baffle to lower and contact the material; S2, when the mill disc of the mill rotates to work, the height of the material baffle from the mill disc is obtained in real time by an absolute value encoder; S3, the real-time working condition parameters of the mill are obtained by the control system, and the working height of the material baffle is determined according to the working condition parameters; S4, the control system controls the driving device to act, and the material baffle is accurately adjusted and maintained at the working height according to the real-time feedback of the absolute value encoder.

[0018] Compared with the prior art, the application has the following beneficial effects: 1. The uniform material distributor and material distribution method for a large mill, by providing a material baffle with a material distribution disc and a material stirring table, realizes fine flattening of the material in the radial and circumferential directions, and significantly improves the uniformity of material distribution and fundamentally solves the problem of uneven grinding of the mill roller.

[0019] 2. The uniform material distributor and material distribution method for a large mill, by using a servo motor to drive a threaded lifting rod and cooperating with an absolute value encoder to form an indirect lifting control system, realizes accurate and reliable closed-loop control of the height of the material baffle, and dynamically adapts to changes in the thickness of the material layer, while completely avoiding contamination or damage of the sensor inside the mill.

[0020] 3. The uniform material distributor and material distribution method for a large mill, by sliding clamping cooperation of the lifting clamp block and the sliding groove and inclined arrangement of the threaded lifting rod, realizes flexible connection and spatial optimization of the material baffle and the driving mechanism, and skillfully avoids the working area of the mill roller and reserves sufficient space for expanding the material injection port at the top of the mill.

[0021] 4. The uniform material distributor and material distribution method for a large mill, by integrating various working condition parameters of the mill into the control system, realizes self-adaptive intelligent decision of the material distribution height, and realizes the technical effect of keeping the distributor in the best working state and further optimizing the production efficiency and energy consumption of the mill. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, although the drawings represent possible implementations in accordance with the present disclosure, the drawings are not necessarily to scale and certain features can have been exaggerated or minimized. A skilled artisan will further appreciate from the following description with reference to the drawings that various configurations are possible.

[0023] Figure 1 The schematic diagram of the whole structure of the mill of the present application; Figure 2 The schematic diagram of the mill disc, the mill roller and the material of the present application; Figure 3 The schematic diagram of the cloth baffle assembly structure of the present application; Figure 4 The front view of the present application Figure 3 ; Figure 5 The side view of the present application Figure 4 ; Figure 6 The split diagram of the cloth baffle of the present application; The meanings of the various labels in the drawings are as follows: 100, cloth baffle; 110, cloth disc; 120, stirring table; 130, distribution table; 140, chute; 200, threaded lifting rod; 300, lifting clamp block; 310, sliding tendon; 400, servo motor; 410, threaded sleeve; 420, absolute value encoder. DETAILED DESCRIPTION

[0024] The details of the present application can be more clearly understood with reference to the drawings and the following description of specific embodiments of the present application. However, the specific embodiments of the present application described herein are intended for purposes of illustration only and are not intended to be limiting in any way. Any possible variations and modifications that can be conceived based on the present application by a skilled artisan are deemed to be within the scope of the present application. The terms "mounting" and "connection" should be interpreted broadly, either directly connected or indirectly connected through an intermediate medium.

[0025] The terms "central axis", "vertical", "horizontal", "front", "back", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like as used herein to indicate an orientation or positional relationship based on the orientation or position shown in the drawings, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, in the description of the present application, the meaning of "several" is two or more, unless otherwise explicitly and specifically limited.

[0026] Referring to Figures 1-6 As shown in the drawings, the present application provides a uniform distributor for large-scale grinding mill, which comprises a distribution baffle 100, a driving device and a control system; the distribution baffle 100 is horizontally arranged above the center of the grinding disc, and the length of the distribution baffle 100 is less than the diameter of the grinding pressure range formed by the plurality of grinding rollers.

[0027] Further, the distribution baffle 100 is in the shape of a long plate, and a distribution disc 110 in the shape of a circular truncated cone is arranged at the middle of the bottom surface of the distribution baffle 100, which is used to flatten the material accumulated at the center of the grinding disc. The top surface of the distribution disc 110 is in the structure of "high in the center and low at the edge", so that the material falling or gathered on the top surface of the distribution disc 110 can slide down by itself, avoiding the material remaining. The distribution baffle 100 is made of wear-resistant steel plate, which is durable and prolongs the maintenance cycle of the distribution baffle 100.

[0028] Further, the distribution baffle 100 is in the shape of a long plate, and a distribution disc 110 in the shape of a circular truncated cone is arranged at the middle of the bottom surface of the distribution baffle 100, which is used to flatten the material accumulated at the center of the grinding disc. The top surface of the distribution disc 110 is in the structure of "high in the center and low at the edge", so that the material falling or gathered on the top surface of the distribution disc 110 can slide down by itself, avoiding the material remaining. The distribution baffle 100 is made of wear-resistant steel plate, which is durable and prolongs the maintenance cycle of the distribution baffle 100.

[0029] Further, the top of the distribution baffle 100 is provided with a distribution table 130 in the shape of an angular protrusion; so that when the material is injected from the top of the grinding mill, the material falling on the top of the distribution baffle 100 slides down from the distribution table 130 by itself, avoiding remaining.

[0030] Specifically, since the height of the accumulated material decreases as the grinding disc rotates, the height of the material distribution baffle 100 needs to be adjusted in real time to continuously flatten the material; the driving device is used to drive the lifting movement of the material distribution baffle 100 relative to the surface of the grinding disc; the driving device includes a pair of servo motors 400 and an absolute value encoder 420 mounted on the top shell of the grinding machine; a threaded lifting rod 200 is movably connected between the output shaft of the servo motor 400 and the material distribution baffle 100, and the height of the material distribution baffle 100 is adjusted by lifting through a pair of threaded lifting rods 200 driven by the servo motor 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 value encoder 420, and further converts the real-time height of the material distribution baffle 100. This is an indirect measurement method that completely avoids the dust accumulation, vibration and high temperature encountered by direct position measurement sensors, thereby facilitating maintenance.

[0031] Further, the lower end of the threaded lifting rod 200 is hinged with a lifting clamp block 300, and the lifting clamp block 300 is slidingly clamped with the top of the material distribution baffle 100; two long sides of the top of the material distribution baffle 100 are symmetrically provided with sliding grooves 140, and the two inner sides of the lifting clamp block 300 are symmetrically provided with sliding ribs 310, which are slidingly inserted into the sliding grooves 140; so that the threaded lifting rod 200 lifts the material distribution baffle 100 by sliding through the lifting clamp block 300, thereby avoiding the working area of several grinding rollers by placing the threaded lifting rod 200 at an angle, and also making the installation position of the servo motor 400 away from the material injection port at the top of the grinding machine, which is beneficial to expanding the diameter of the material injection port and quickly injecting material.

[0032] Further, the output shaft end of the servo motor 400 is coaxially connected with a threaded sleeve 410, and the threaded sleeve 410 is threadedly sleeved with the threaded lifting rod 200; since a pair of threaded lifting rods 200 are provided on the material distribution baffle 100 for driving, and the threaded lifting rod 200 is hinged with the lifting clamp block 300 for rotation limiting, the threaded lifting rod 200 and the threaded sleeve 410 are threadedly rotated to control the lifting of the material distribution baffle 100 by extending and retracting along the axial direction; the upper end of the threaded sleeve 410 is sleeved with a bearing which is embedded on the top shell of the grinding machine, so that the threaded sleeve 410 can rotate freely driven by the servo motor 400, and a sealing assembly is provided between the bearing and the hole of the top shell of the grinding machine; the sealing assembly adopts a flexible sealing sleeve, which effectively prevents dust from escaping from the inside of the grinding machine and keeps the external environment clean.

[0033] Specifically, the control system is electrically connected with the driving device; the absolute value encoder 420 is used to detect the rotation angle of the output shaft of the servo motor 400 in real time, and feed back the detection signal to the control system to indirectly calculate the lifting displacement of the material distribution baffle 100; The control system is configured to accurately control the action of the driving device according to the feedback signal of the absolute value encoder 420, so as to adjust and maintain the cloth baffle 100 in the preset safe height range, and avoid the cloth baffle 100 from touching the grinding disc or the grinding roller.

[0034] Further, the control system is also configured to receive the working condition parameters of the mill, and dynamically adjust the preset height of the cloth baffle 100 according to the working condition parameters; the working condition parameters include at least one of the mill output, the feeding amount, the grinding disc rotating speed, the material thickness and the material type. The working condition parameters are input into the central control unit of the control system; the control system pre-stores or calculates in real time the optimal cloth leveling height matched with the parameters, and then sends an instruction to the servo motor 400 to drive the cloth baffle 100 to rise to the predetermined position to level the material, so that the material is evenly spread, and the local accumulation is avoided to increase the wear degree of the grinding roller.

[0035] The cloth distribution method of the uniform cloth distributor for the large mill comprises the following steps: S1, a pair of servo motors 400 are started to drive a pair of threaded lifting rods 200 to descend along the axial direction, and the cloth baffle 100 is lowered to contact the material; S2, when the grinding disc of the mill rotates to work, the height of the cloth baffle 100 from the grinding disc is obtained in real time by the absolute value encoder 420; S3, the real-time working condition parameters of the mill are obtained by the control system, and the working height of the cloth baffle 100 is determined according to the working condition parameters; S4, the control system controls the action of the driving device, and accurately adjusts and maintains the cloth baffle 100 at the working height according to the real-time feedback of the absolute value encoder 420.

[0036] Embodiment: Taking the ZGM113G slag mill as an example, when processing slag with high water content, the material flowability is poor, and the height of the cloth baffle 100 needs to be lowered to 150mm to enhance the leveling force and prevent the material from accumulating. When processing dry raw materials, the material flowability is good, and the cloth baffle 100 is raised to 300mm to avoid excessive blocking and cause the material to splash. The control system automatically calls the preset height value according to the material type signal, and drives the cloth baffle to the position. Through the adaptive adjustment, the output of the mill in a maintenance cycle is further increased from the original 94,000 tons to 102,000 tons, and the uniformity of the wear of the grinding roller is increased by more than 15%.

[0037] It should be noted that the fixed connection, fixed with the term of the application adopts the conventional fixing means such as bolt connection or welding. The above-mentioned embodiments are only for illustrating the technical concept and characteristics of the application, and the purpose is to enable the person skilled in the art to understand the content of the application and to implement it, and cannot limit the protection scope of the application. Any equivalent changes or modifications made according to the spirit and principle of the application should be covered within the protection scope of the application.

Claims

1. A uniform feeder for a large mill, characterized in that, The cloth baffle ultrasonic wave is arranged above the center of the grinding disc, and the length of the cloth baffle ultrasonic wave is smaller than the diameter of the grinding pressure range formed by the grinding rollers. The driving device includes a pair of servo motor ultrasonic waves and absolute value encoder ultrasonic waves mounted on the top shell of the grinding machine, and a threaded lifting rod ultrasonic wave movably connected between the output shaft of the servo motor ultrasonic wave and the cloth baffle ultrasonic wave. The control system is electrically connected with the driving device, and the absolute value encoder ultrasonic wave is used to detect the rotation angle of the output shaft of the servo motor ultrasonic wave in real time and feed back the detection signal to the control system to indirectly calculate the lifting displacement of the cloth baffle ultrasonic wave. The control system is configured to accurately control the action of the driving device according to the feedback signal of the absolute value encoder ultrasonic wave to adjust and maintain the cloth baffle ultrasonic wave in the preset safe height range.

2. The uniform feeder for a large-scale mill according to claim 1, characterized in that: The cloth baffle ultrasonic wave is in the shape of a long plate, and a cloth disc ultrasonic wave in the shape of a circular truncated cone is arranged at the middle of the bottom surface of the cloth baffle ultrasonic wave to flatten the material accumulated in the center of the grinding disc.

3. The uniform feeder for a large-scale mill according to claim 2, characterized in that: The cloth baffle ultrasonic wave is in the shape of a long plate, and a cloth disc ultrasonic wave in the shape of a circular truncated cone is arranged at the middle of the bottom surface of the cloth baffle ultrasonic wave to flatten the material accumulated in the center of the grinding disc.

4. The uniform feeder for a large-scale mill according to claim 3, characterized in that: The cloth baffle ultrasonic wave is in the shape of a long plate, and a cloth disc ultrasonic wave in the shape of a circular truncated cone is arranged at the middle of the bottom surface of the cloth baffle ultrasonic wave to flatten the material accumulated in the center of the grinding disc.

5. A uniform distributor for a large mill according to claim 4, characterized in that: The lower end of the threaded lifting rod ultrasonic wave is hingedly connected with a lifting clamp block ultrasonic wave, and the lifting clamp block ultrasonic wave is slidably connected with the top of the cloth baffle ultrasonic wave.

6. A uniform distributor for a large mill according to claim 5, characterized in that: The top of the cloth baffle ultrasonic wave is symmetrically provided with a sliding groove ultrasonic wave on both long sides, and the lifting clamp block ultrasonic wave is symmetrically provided with a sliding rib ultrasonic wave on both inner sides.

7. A uniform distributor for a large mill according to claim 6, characterized in that: The output shaft end of the servo motor ultrasonic wave is coaxially connected with a threaded sleeve ultrasonic wave, and the threaded sleeve ultrasonic wave is threadedly connected with the threaded lifting rod ultrasonic wave.

8. A uniform distributor for a large mill according to claim 7, characterized in that: The top of the cloth baffle ultrasonic wave is provided with a prismatic raised material distribution table ultrasonic wave.

9. A uniform distributor for a large mill according to claim 8, characterized in that: The upper end of the threaded sleeve ultrasonic wave is provided with a bearing, and the bearing is embedded on the top shell of the grinding machine.

10. A method of distributing material with a uniform distributor for a large mill using the uniform distributor for a large mill according to claim 9, characterized by, The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters. The control system is further configured to receive the working condition parameters of the grinding machine and dynamically adjust the preset height of the cloth baffle ultrasonic wave according to the working condition parameters.

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