Method for detecting throwing angle of steel ball and material of drum mill

Abstract

The invention relates to a drum mill steel ball and material throwing angle detection method, which comprises a mill cylinder, a signal processing unit and a data processing unit, supporting seats are arranged on the left side and the right side of the mill cylinder, a lifting strip is arranged in the mill cylinder, vibration sensors are arranged at bearings of the supporting seats, and a rotating speed sensor is arranged on the outer side wall of the mill cylinder; specifically, the detection steps of the throwing angle are as follows: S1, collecting a vibration signal; s2, acquiring a rotating speed signal; s3, the signal processing unit filters and amplifies the vibration signal and the rotating speed signal; s4, the data processing unit calculates the speed of the cylinder; s5, the data processing unit extracts an impact characteristic value and a time characteristic value according to the processed vibration signal; and S6, the data processing unit calculates the throwing angle according to the speed of the cylinder and the time characteristic value. The real-time throwing angle in the running process of the mill can be monitored in real time, and a worker is helped to adjust the working strategy of the mill.

Description

Technical Field

[0001] This invention relates to the field of equipment monitoring, specifically to a method for detecting the angle of steel balls and material drop in a rotary mill. Background Technology

[0002] Rotary drum mills are widely used in mineral processing, cement production, and other fields. Their working principle involves the rotation of the drum causing the grinding media inside to adhere to the liner surface under the influence of centrifugal force and friction with the inner wall of the drum. The media rotate with the drum and are carried to a certain height, then fall freely under gravity. During this fall, the grinding media impacts the material at the bottom like projectiles, crushing it. This cyclical movement of the grinding media's ascent and descent means that slurry accumulation, idling, and volume overload are key factors affecting the mill's grinding efficiency and energy consumption.

[0003] Traditional detection methods lack the ability to measure the drop angles of steel balls and materials, yet this measurement is crucial for understanding the real-time operating status of the mill. Therefore, this invention proposes a method for detecting the drop angles of steel balls and materials in rotary mills. Summary of the Invention

[0004] This invention proposes a method for detecting the drop angles of steel balls and materials in a rotary mill. The aim is to help operators understand the mill's operating status by detecting these drop angles, thereby facilitating better decision-making and improving mill efficiency. The specific technical solution is as follows: A method for detecting the drop angle of steel balls and materials in a rotary mill includes a mill body, a signal processing unit, and a data processing unit. Support seats are provided on both the left and right sides of the mill body, and lifting bars are installed inside the mill body. Vibration sensors are installed at the bearings of the support seats, and speed sensors are installed on the outer wall of the mill body. The signal processing unit receives and processes the signals from the vibration and speed sensors and transmits the processed signals to the data processing unit. Specifically, the steps for detecting the drop angle are as follows: S1. The vibration sensor collects the vibration signal of its corresponding bearing in real time and transmits it to the signal processing unit. S2. The speed sensor collects the speed signal of the mill cylinder in real time and transmits it to the signal processing unit; S3. The signal processing unit filters and amplifies the vibration signal and rotation speed signal. S4. The data processing unit calculates the speed of the mill cylinder based on the processed rotation speed signal; S5. The data processing unit analyzes the processed vibration signal and extracts impact characteristic values ​​and time characteristic values. S6. The data processing unit calculates the drop angle based on the speed and time characteristic values ​​of the mill cylinder.

[0005] Furthermore, in S6, the drop angle calculation model is as follows: in: Mill cylinder rotation speed (r / min) Time feature value, Increase the number of bars.

[0006] Furthermore, the vibration sensor uses an accelerometer, and the rotation speed sensor uses a non-contact photoelectric rotation speed sensor.

[0007] Furthermore, the signal processing unit includes a filtering circuit and an amplification circuit.

[0008] Furthermore, it also includes a display unit, which is connected to the data processing unit to display real-time data of the drop angle.

[0009] Furthermore, the data processing unit employs a digital signal processor or a microprocessor.

[0010] Furthermore, the detection steps also include S7, where the data processing unit generates a real-time material line diagram based on the drop angle and impact characteristic value and displays it on the display unit.

[0011] The beneficial effects of this invention are as follows: 1. It can monitor the vibration and speed signals during the operation of the mill in real time. The data processing unit calculates the real-time drop angle information by using the acquired vibration and speed signals. Based on the drop angle information, the staff can adjust the mill's operating parameters in a timely manner, which helps to improve the mill's grinding efficiency, reduce energy consumption, and extend the service life of the equipment.

[0012] 2. The speed sensor adopts a non-contact photoelectric sensor, which avoids direct contact with the mechanical parts of the mill, reduces sensor wear and failure risk, and improves the reliability and stability of the system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the installation of the detection system described in the embodiment; Figure 2 This is a schematic diagram of the workflow of the detection system described in the embodiment; Figure 3This is a schematic cross-sectional view of the mill described in the embodiment; Figure 4 This is a schematic diagram of the polar coordinates described in the embodiment; Figure 5 This is a schematic diagram of the material line diagram described in this invention.

[0015] In the diagram: 1. Left support; 2. Left vibration sensor; 3. Mill cylinder; 301. Outer wall; 302. Lifting bar; 4. Right vibration sensor; 5. Right support; 6. Speed ​​sensor. Detailed Implementation

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not 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, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] The present invention provides the following specific implementation schemes: like Figure 1-5 As shown, this invention provides a method for detecting the drop angle of steel balls and materials in a rotary mill. The method includes a mill body 3 and a detection system. Support seats (including a left support seat 1 and a right support seat 5) are provided on both the left and right sides of the mill body. A lifting bar 302 is provided inside the mill body 3. The detection system includes vibration sensors (left vibration sensor 2 and right vibration sensor 4), a speed sensor 6, a signal processing unit, a data processing unit, and a display unit. The left vibration sensor 2 is mounted on the bearing of the left support seat 1, the right vibration sensor 4 is mounted on the bearing of the right support seat 5, and the speed sensor 6 is mounted on the outer wall 301 of the mill body. The signal processing unit is electrically connected to the left vibration sensor 2, the right vibration sensor 4, the speed sensor 6, and the data processing unit. The signal processing unit receives and processes the signals from the vibration sensors and the speed sensor and transmits the processed signals to the data processing unit. The data processing unit calculates the drop angle of the steel balls and materials based on the processed vibration and speed signals. The display unit is electrically connected to the data processing unit and displays the real-time data of the drop angle.

[0018] Specifically, the steps for detecting the drop angle are as follows: S1, left vibration sensor 2, and right vibration sensor 4 respectively collect the vibration signals of their corresponding bearings in real time and transmit them to the signal processing unit.

[0019] S2, the speed sensor 6 collects the speed signal of the mill cylinder 1 in real time and transmits it to the signal processing unit.

[0020] S3. The signal processing unit uses wavelet denoising and bandpass filtering to filter and amplify the vibration signal and rotation speed signal.

[0021] S4. The data processing unit calculates the speed of the mill cylinder 1 based on the processed rotational speed signal.

[0022] S5. The data processing unit uses FFT spectrum analysis and peak search to perform time-domain and frequency-domain analysis on the processed vibration signal and extract impact feature values. and time eigenvalues .

[0023] S6. The data processing unit calculates the drop angle based on the velocity and time characteristic values ​​of the mill cylinder 1.

[0024] S7. The data processing unit establishes polar coordinates based on the drop angle and impact characteristic value, treats each point of the polar coordinates as a steel ball or a piece of material, generates a real-time material line diagram, and displays it in the display unit.

[0025] Specifically, in S6, the calculation model for the drop angle is as follows: in: The rotational speed (r / min) of mill cylinder 1, Time feature value, Increase the number of bars.

[0026] Furthermore, both the left vibration sensor 2 and the right vibration sensor 4 are accelerometers, which can accurately acquire the radial and axial vibration acceleration signals of the bearing; the speed sensor 6 is a non-contact photoelectric speed sensor, which can accurately measure the speed of the mill cylinder and the lifting bars.

[0027] Furthermore, the signal processing unit includes a filtering circuit and an amplification circuit to filter and amplify the acquired vibration signal and rotation speed signal in order to remove noise and improve signal quality.

[0028] Furthermore, the data processing unit employs a digital signal processor (DSP) or a microprocessor.

[0029] It can monitor the vibration and speed signals during the operation of the mill in real time. The data processing unit calculates the real-time drop angle information by using the acquired vibration and speed signals. Based on the drop angle information, the staff can adjust the mill's operating parameters such as speed and feed rate in a timely manner, which helps to improve the mill's grinding efficiency, reduce energy consumption, and extend the service life of the equipment.

[0030] The speed sensor uses a non-contact photoelectric sensor, which avoids direct contact with the mechanical parts of the mill, reduces sensor wear and failure risk, and improves the reliability and stability of the system.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for detecting the throwing angle of steel balls and materials in a rotary mill, characterized in that: The system includes a mill cylinder, a signal processing unit, and a data processing unit. Support seats are located on both the left and right sides of the mill cylinder. Lifting bars are installed inside the mill cylinder. Vibration sensors are installed at the bearings of the support seats. A speed sensor is installed on the outer wall of the mill cylinder. The signal processing unit receives and processes the signals from the vibration and speed sensors and transmits the processed signals to the data processing unit. Specifically, the steps for detecting the drop angle are as follows: S1. The vibration sensor collects the vibration signal of its corresponding bearing in real time and transmits it to the signal processing unit. S2. The speed sensor collects the speed signal of the mill cylinder in real time and transmits it to the signal processing unit; S3. The signal processing unit filters and amplifies the vibration signal and rotation speed signal. S4. The data processing unit calculates the speed of the mill cylinder based on the processed rotation speed signal; S5. The data processing unit analyzes the processed vibration signal and extracts impact characteristic values ​​and time characteristic values. S6. The data processing unit calculates the drop angle based on the speed and time characteristic values ​​of the mill cylinder.

2. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 1, characterized in that: In S6, the drop angle calculation model is as follows: in: Mill cylinder rotation speed (r / min) Time feature value, Increase the number of bars.

3. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 1, characterized in that: The vibration sensor uses an accelerometer, and the rotation speed sensor uses a non-contact photoelectric rotation speed sensor.

4. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 1, characterized in that: The signal processing unit includes filtering circuits and amplification circuits.

5. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 1, characterized in that: It also includes a display unit, which is connected to the data processing unit to display real-time data of the drop angle.

6. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 1, characterized in that: The data processing unit uses a digital signal processor or a microprocessor.

7. The method for detecting the throwing angle of steel balls and materials in a rotary mill according to claim 5, characterized in that: The detection steps also include S7, where the data processing unit generates a real-time material curve based on the drop angle and impact characteristic value and displays it on the display unit.

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