Method for detecting milling sound of ball mill

Abstract

The method comprises the following steps: determining a sound source position of the ball mill, and obtaining noise decibel information of each bin of the ball mill through a sound level meter in a ball mill milling sound detection system; transmitting the noise decibel information to an acoustic analyzer of the ball mill grinding sound detection system, and converting the noise decibel information into an acoustic image cloud picture; and analyzing the sound image cloud picture to obtain sound waves of different bins of the ball mill so as to determine the working state of the ball mill. Through the acoustic analysis technology, noise decibel information obtained by the sound level meter is displayed on the acoustic analyzer through a picture in a spectrum or image mode, an operator directly determines the working state of the ball mill according to the change height of a picture wave band, the phenomena of full grinding and full grinding of the ball mill are avoided, the operation efficiency of the ball mill is improved, and the working efficiency of the ball mill is improved. Meanwhile, hearing injury and personal injury caused by the fact that a mill worker listens to the mill sound on site are avoided, and a solid foundation is provided for intelligent and informatization operation.

Description

Technical Field

[0001] The invention relates to the technical field of ball mills, and in particular to a method for detecting grinding noise of a ball mill. Background Art

[0002] As the main equipment for material grinding, ball mill plays an important role in material processing and mineral beneficiation. During the working process of ball mill, grinding sound is an important indicator of the load state of ball mill. By monitoring grinding sound, the operating state of ball mill can be effectively evaluated and the production process can be optimized, which helps the staff to understand the operating state of ball mill in time and optimize its working performance. It has important application value in industrial production.

[0003] At present, the grinding noise detection of ball mills is mostly based on manual experience. However, although manual experience can provide preliminary judgment to a certain extent, the speed of manual detection is relatively slow and subjective. Long-term auditory detection will cause auditory fatigue of the operator, which will affect the sensitivity and accuracy of grinding noise, thereby increasing the risk of misjudgment. Secondly, manual detection is easily affected by environmental noise and other interference factors, which reduces the accuracy of detection, resulting in unsatisfactory control effect of the mill and low degree of industrial automation.

[0004] Therefore, how to effectively monitor the grinding sound of the ball mill and achieve precise control of the operating status of the ball mill is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] In order to solve the above technical problems, this application proposes the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a method for detecting grinding noise of a ball mill, comprising:

[0007] Determine the location of the sound source of the ball mill and obtain the noise decibel information of each chamber of the ball mill through the sound level meter in the ball mill grinding sound detection system;

[0008] The noise decibel information is transmitted to the acoustic analyzer of the ball mill grinding sound detection system and then converted into an acoustic cloud image;

[0009] The acoustic image cloud diagram is analyzed to obtain the acoustic waves of different chambers of the ball mill to determine the working state of the ball mill.

[0010] In a possible implementation, determining the sound source position of the ball mill and obtaining the noise decibel information of each bin of the ball mill through a sound level meter in a ball mill grinding sound detection system includes:

[0011] The noise decibel level of different chambers of the ball mill is collected at multiple points by using noise measuring equipment;

[0012] Determine the location with the highest noise decibel value as the installation location of the sound level meter.

[0013] In a possible implementation, the noise decibel information is converted into an acoustic cloud map using an acoustic analyzer using the following formula:

[0014]

[0015] Among them, A is the noise decibel number measured by the sound level meter, B is the amplitude decibel number of the mill under the optimal operating state measured by the sound level meter, D is the standard load during the operation of the mill, E is the actual load during the operation of the mill, and 65 is the magnification factor of the image of the acoustic analyzer.

[0016] In a possible implementation, analyzing the acoustic cloud image to obtain the acoustic waves of different chambers of the ball mill to determine the working state of the ball mill includes:

[0017] When the height of the sound wave band is less than or equal to 50mm, the working state of the ball mill is a serious saturation state;

[0018] When the height of the sound wave band is within the range of 51mm to 59mm, the ball mill is in a saturated grinding state;

[0019] When the sound wave band height is within the range of 60mm to 70mm, the ball mill is in normal working state;

[0020] When the height of the sound wave band is within the range of 71mm to 80mm, the ball mill is in an empty grinding state;

[0021] When the height of the sound wave band is greater than or equal to 80mm, the ball mill is in a severe empty grinding state.

[0022] In a possible implementation, the ball mill grinding sound detection system includes: multiple sound level meters, different sound level meters are arranged on the outside of different chambers of the ball mill, and each of the sound level meters is correspondingly provided with a unique acoustic analyzer, and the acoustic analyzer is used to receive noise decibel information sent by the sound level meter electrically connected thereto.

[0023] In a possible implementation, the sound level meter and the acoustic analyzer are respectively provided with a USA-interface and a USB-C interface, and the sound level meter and the acoustic analyzer are connected to a computer via a wireless Wi-Fi connection through the USB-C interface and displayed on the computer.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] This application uses acoustic analysis technology to display the noise decibel information obtained by the sound level meter in the form of a spectrum or image on the acoustic analyzer through a screen. The operator can directly judge whether the grinding sound is normal or abnormal through the change in the height of the screen band, thereby quickly judging whether the mill is fully ground, empty, or in a normal state, thereby improving operating efficiency. At the same time, it also prevents the occurrence of hearing damage, personal injury, etc. caused by the grinder listening to the grinding sound on site, and provides a solid foundation for intelligent and information-based operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a ball mill grinding sound detection system provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a process flow of a ball mill grinding sound detection method provided in an embodiment of the present application;

[0028] Figure 3 A rectangular diagram of the conversion of a sound level meter into an acoustic analyzer provided in an embodiment of the present application;

[0029] Figure 4 The embodiment of the present application provides a spectrum diagram converted from a sound level meter to an acoustic analyzer. DETAILED DESCRIPTION

[0030] The present solution is described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Figure 1 The structural diagram of the ball mill grinding sound detection system provided in the embodiment of the present application is shown in FIG. Figure 1 The ball mill grinding sound detection system in the present application includes: multiple sound level meters, different sound level meters are arranged on the outside of different chambers of the ball mill, and each sound level meter is correspondingly provided with a unique acoustic analyzer, and the acoustic analyzer is used to receive the noise decibel information sent by the sound level meter electrically connected thereto.

[0032] Since the noise decibel values ​​at different points corresponding to different chambers of the ball mill are different, in order to more accurately detect the working state of the ball mill, the position with the largest noise decibel value is used as the installation position of the sound level meter. In this embodiment, the first sound level meter is installed on the outside of the cylinder rotating clockwise in the front chamber of the ball mill, 1.5m away from the front end of the cylinder of the ball mill, and 300mm away from the mill body. The second sound level meter is installed on the outside of the cylinder rotating clockwise in the rear chamber of the ball mill, 2m away from the rear end of the cylinder of the ball mill, and 300mm away from the mill body.

[0033] In this embodiment, the XL3 acoustic analyzer is used to replace manual listening to the grinding sound. The XL3 acoustic analyzer is installed in the microcomputer control room. The grinding sound is converted into images and graphs, and the grinding sound situation is judged vividly and quickly, which is convenient for the operator to quickly and stably adjust the mill feeding. In addition, the sound level meter and the acoustic analyzer are respectively provided with a USA-interface and a USB-C interface, wherein the XL3 acoustic analyzer and the sound level meter are connected by a data cable through the USA-interface, and a wireless Wi-Fi connection is achieved through the USB-C interface to connect to the computer and display it on the computer. The noise decibel information of the sound level meter is transmitted to the acoustic analyzer, and the acoustic analysis technology of the acoustic analyzer is used. These information will be displayed on the acoustic analyzer through the screen in the form of a spectrum or image. It helps the mill operator to intuitively judge the size of different sound wave bands to determine whether the grinding sound is normal and whether there is a phenomenon of full grinding or full grinding of the mill, thereby replacing the human ear to grasp the grinding sound at a long distance, providing important technical support for the operation of the mill.

[0034] See also Figure 2 The ball mill grinding sound detection method in this embodiment includes:

[0035] S101, determine the sound source position of the ball mill and obtain the noise decibel information of each chamber of the ball mill through a sound level meter in a ball mill grinding sound detection system.

[0036] In this embodiment, noise decibel values ​​of different chambers of the ball mill are collected at multiple points by using noise measuring equipment, and the position with the maximum noise decibel value is determined as the installation position of the sound level meter.

[0037] S102, the noise decibel information is transmitted to the acoustic analyzer of the ball mill grinding sound detection system and then converted into an acoustic cloud map. In this embodiment, the formula for converting the acoustic cloud map using the acoustic analyzer is:

[0038]

[0039] Among them, A is the noise decibel number measured by the sound level meter, B is the amplitude decibel number of the mill under the optimal operating state measured by the sound level meter, D is the standard load during the operation of the mill, E is the actual load during the operation of the mill, and 65 is the magnification factor of the image of the acoustic analyzer.

[0040] S103, analyzing the acoustic cloud image to obtain the acoustic waves of different chambers of the ball mill to determine the working state of the ball mill.

[0041] In this embodiment, the noise decibel information is displayed on the acoustic analyzer in the form of a spectrum or an image. Figure 3 and Figure 4When the display band height of the acoustic analyzer is less than or equal to 50mm, the ball mill is in a severely saturated state; when the display band height is within the range of 51mm to 59mm, the ball mill is in a saturated state; when the display band height is within the range of 60mm to 70mm, the ball mill is in a normal state; when the display band height is within the range of 71mm to 80mm, the ball mill is in an empty state; when the display band height is greater than or equal to 80mm, the ball mill is in a severely empty state.

[0042] In this embodiment, when the display band heights of the first acoustic analyzer and the second acoustic analyzer are both within the range of 60 to 70 mm, it indicates that the ball mill is in a normal working state. At this time, there is no need to adjust the feed of the mill.

[0043] When the display band height of the first acoustic analyzer is within the range of 60-70mm, and the display band height of the second acoustic analyzer is within the range of 51-59mm or less than or equal to 50mm, it indicates that the rear bin of the ball mill is in a saturated or severely saturated state. In order to ensure the normal operation of the ball mill, it is necessary to stop the material in the front bin of the mill to prevent excessive feeding and blockage of the mill.

[0044] When the display band height of the first acoustic analyzer is within the range of 60-70mm, the display band height of the second acoustic analyzer is within the range of 71-80mm or the display band height is greater than or equal to 80mm, it indicates that the rear bin of the ball mill is in an empty or severe empty state. At this time, the material circulation speed is slow. In order to ensure the normal operation of the ball mill, it is also necessary to stop the material in the front bin and move the material in the front bin to the rear bin.

[0045] When the display band height of the first acoustic analyzer is within the range of 51-59mm or less than or equal to 50mm, and the display band height of the second acoustic analyzer is within the range of 60-70mm, it indicates that the front chamber of the ball mill is in a saturated or severely saturated state. In order to ensure the normal operation of the ball mill, it is necessary to stop the material in the front chamber of the mill.

[0046] When the display band height of the first acoustic analyzer is within the range of 71-80mm or the display band height is greater than or equal to 80mm, and the display band height of the second acoustic analyzer is within the range of 60-70mm, it indicates that the front chamber of the ball mill is in an empty grinding or severe empty grinding state. At this time, it is necessary to add material to the front chamber of the mill to ensure the normal operation of the ball mill.

[0047] In the embodiments of the present application, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0048] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0049] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for detecting grinding noise of a ball mill, characterized in that: include: Determine the location of the sound source of the ball mill and obtain the decibel information of the noise in each chamber of the ball mill through the sound level meter in the ball mill grinding sound detection system; The noise decibel information is transmitted to the acoustic analyzer of the ball mill grinding sound detection system and then converted into an acoustic cloud image; The acoustic image cloud diagram is analyzed to obtain the acoustic waves of different chambers of the ball mill to determine the working state of the ball mill.

2. The method for detecting grinding noise of a ball mill according to claim 1, characterized in that: The method of determining the sound source position of the ball mill and obtaining the noise decibel information of each chamber of the ball mill through a sound level meter in the ball mill grinding sound detection system includes: The noise decibel level of different chambers of the ball mill is collected at multiple points by using noise measuring equipment; Determine the location with the highest noise decibel value as the installation location of the sound level meter.

3. The method for detecting grinding noise of a ball mill according to claim 1, characterized in that: The formula for converting the noise decibel information into an acoustic cloud map using an acoustic analyzer is: Among them, A is the noise decibel number measured by the sound level meter, B is the amplitude decibel number of the mill under the optimal operating state measured by the sound level meter; D is the standard load during the operation of the mill, E is the actual load during the operation of the mill, and 65 is the magnification factor of the image of the acoustic analyzer.

4. The method for detecting grinding noise of a ball mill according to claim 1, characterized in that: Analyzing the acoustic image cloud diagram to obtain the acoustic waves of different chambers of the ball mill to determine the working state of the ball mill includes: When the height of the sound wave band is less than or equal to 50mm, the working state of the ball mill is a serious saturation state; When the sound wave band height is within the range of 51mm to 59mm, the ball mill is in a saturated grinding state; When the sound wave band height is within the range of 60mm to 70mm, the ball mill is in normal working state; When the height of the sound wave band is within the range of 71mm to 80mm, the ball mill is in an empty grinding state; When the height of the sound wave band is greater than or equal to 80mm, the ball mill is in a severe empty grinding state.

5. The method for detecting grinding noise of a ball mill according to claim 1, characterized in that: The ball mill grinding sound detection system comprises: a plurality of sound level meters, different sound level meters are arranged outside different chambers of the ball mill, and each of the sound level meters is correspondingly provided with a unique acoustic analyzer, and the acoustic analyzer is used to receive the noise decibel information sent by the sound level meter electrically connected thereto.

6. The method for detecting grinding noise of a ball mill according to claim 5, characterized in that: The sound level meter and the acoustic analyzer are respectively provided with a USA-interface and a USB-C interface. The sound level meter and the acoustic analyzer are connected to a computer via a wireless Wi-Fi connection through the USB-C interface and displayed on the computer.

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