A method and control device for noise control of a belt conveyor

Abstract

The application discloses a noise control method and control device of a belt conveyor, comprising the following step A: obtaining the vibration condition of the truss and the belt when the belt conveyor is running, judging whether the truss and the belt resonate, if yes, adjusting the belt tension within the safe range of the belt tension, and changing the vibration frequency of the belt. Since the running noise of the belt conveyor is mostly caused by the same frequency vibration of the steel structure and the belt, the noise control method of the belt conveyor obtains the vibration condition of the truss and the belt when the belt conveyor is running, judges whether the truss and the belt resonate based on the vibration condition of the truss and the belt, and determines whether resonance occurs. After the resonance occurs, the belt tension can be adjusted by the power tensioning device, the belt tension changes after the belt tension is changed, the vibration frequency of the belt also changes, thereby eliminating or weakening the resonance phenomenon between the truss and the belt, and the purpose of reducing the running noise is achieved.

Description

Technical Field

[0001] This invention relates to the field of conveyor technology, and more specifically to a noise control method and control device for a belt conveyor. Background Technology

[0002] With the increasing awareness of environmental protection in society, noise emission levels are receiving more and more attention. Many long-distance belt conveyors, such as belt conveyors and pipe conveyors, pass through villages along their routes. If noise emissions do not meet national standards, they will be subject to complaints from residents along the route, forcing factories to shut down for rectification and causing huge economic losses.

[0003] A method for reducing noise in a belt conveyor, as described in the prior art, includes the following steps: lubricating the bearings of the conveyor; replacing the reducer of the drive unit of the conveyor with an adjustable reducer; regularly inspecting the conveyor belt tensioning device to ensure that the conveyor belt always has sufficient tension; and regularly cleaning the dust between the drive roller and the idler roller, etc.

[0004] It can be seen that current technologies still rely on conventional lubrication methods to reduce noise, lacking a comprehensive approach that utilizes multiple methods to control noise, resulting in poor noise reduction performance. Therefore, providing a noise control method and device for belt conveyors to effectively reduce noise during operation is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a noise control method and control device for belt conveyors, which can effectively reduce the noise during the operation of the conveyor.

[0006] To solve the above-mentioned technical problems, the present invention provides a noise control method for a belt conveyor, comprising the following step A:

[0007] The vibration of the truss and belt during the operation of the belt conveyor is obtained, and it is determined whether the truss and the belt resonate. If so, the belt tension is adjusted within the safe range of belt tension to change the vibration frequency of the belt.

[0008] Research has revealed that a significant portion of the operating noise of belt conveyors originates from the synchronous vibration of the steel structure and the conveyor belt. Therefore, the noise control method for belt conveyors in this invention first obtains the vibration data of the truss and conveyor belt during operation. Based on this vibration data, it determines whether resonance occurs between the truss and the conveyor belt. Once resonance is confirmed, the belt tension can be adjusted using a power tensioning device. The change in belt tension alters the belt's tension state and its vibration frequency, thereby eliminating or reducing the resonance between the truss and the conveyor belt, thus reducing the operating noise of the belt conveyor.

[0009] Optionally, obtaining the vibration of the truss and belt during the operation of the belt conveyor and determining whether the truss and belt resonate specifically includes the following steps:

[0010] The vibration displacements of the truss and the tape at different vibration frequencies are obtained, and the percentage difference A between the vibration displacements is obtained based on the vibration displacements of the truss and the tape at different vibration frequencies. n n=1,2,3…;

[0011] Obtain the resonance influence factor B at different vibration frequencies n If n=1,2,3…, and a preset condition is met, the truss and the tape will resonate. The preset condition is D0<C, where D0 is the initial resonance indicator parameter, and D0=B1A1+B2A2+B3A3+…+B n A n C represents the preset percentage.

[0012] Optionally, adjusting the tape tension within a safe range to change the vibration frequency of the tape specifically includes the following steps:

[0013] Each adjustment of the tape tension is approximately 5% of the current tape tension. The resonance indicator parameter D after each tension adjustment is calculated. m m=1,2,3…; each resonance indicator parameter D m The maximum value is D max D max The corresponding tape tension is determined as the final tape tension.

[0014] Optionally, after step A, the following step B may also be included:

[0015] Step B1: Continuously monitor the emission noise of the belt conveyor;

[0016] Step B2: Determine whether the noise emission of the belt conveyor exceeds the standard. If so, reduce the operating speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B2 after running for a first preset time.

[0017] Optionally, the emission noise of the belt conveyor is continuously monitored, specifically including the following steps:

[0018] A noise sensor is arranged at preset intervals along the conveyor line of the belt conveyor, at least in the noise-sensitive area, and the noise sensor detects the emission noise value a preset number of times per second;

[0019] Determining whether the belt conveyor exceeds noise emission standards involves the following steps:

[0020] After removing the maximum and minimum values ​​from the emission noise values ​​detected by the noise sensor, the average emission noise value is calculated. The average emission noise value is the corresponding output emission noise value b of the noise sensor. n n=1,2,3…;

[0021] Compare the output emission noise value b of each of the noise sensors n And the upper limit of noise value a, if at least two of the output emission noise values ​​b n If the noise level exceeds the upper limit value 'a' and the duration exceeds the second preset duration, then the noise emission of the belt conveyor exceeds the standard.

[0022] Optionally, the noise upper limit value a includes a nighttime upper limit value a1 and a daytime upper limit value a2.

[0023] Optionally, the operating speed v1 of the belt conveyor should not be lower than the minimum operating belt speed v1. min Minimum operating belt speed v1 min The calculation is as follows:

[0024]

[0025] In the formula:

[0026] —Minimum transport capacity;

[0027] —Maximum transport capacity;

[0028] —Rated operating belt speed.

[0029] Optionally, step B further includes:

[0030] Step B3: Determine whether the belt conveyor fully utilizes the environmental emission limits. If not, increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B3 after running for a third preset time.

[0031] Optionally, determining whether the belt conveyor fully utilizes environmental emission limits specifically includes the following steps:

[0032] Obtain the maximum value b of the output emission noise value b of each of the noise sensors. max If b max <0.85 If the duration is greater than the fourth preset duration, then the belt conveyor has not fully utilized the environmental emission limits.

[0033] The present invention also provides a noise control device for a belt conveyor, comprising:

[0034] The vibration detection module is used to detect the vibration of the truss and belt during the operation of the belt conveyor;

[0035] The first analysis module is used to determine whether the truss and the tape resonate based on the detection results of the vibration detection module.

[0036] The tension control module is used to control the tensioning device to adjust the belt tension within the safe range of the belt tension, based on the condition that the truss and the tape resonate, so as to change the vibration frequency of the tape and eliminate or reduce the resonance between the truss and the tape.

[0037] The noise control device for the belt conveyor of the present invention is used to implement the aforementioned noise control method for the belt conveyor, and therefore has the same technical effect as the aforementioned noise control method for the belt conveyor, which will not be repeated here.

[0038] Optionally, the vibration detection module includes a truss vibration sensor and a tape vibration detection assembly, wherein:

[0039] The truss vibration sensor is fixed to the truss and is used to detect the vibration of the truss.

[0040] The tape vibration detection assembly includes a tape vibration sensor and a fixing component. The fixing component includes a bearing, a bracket, and a compression spring. The inner ring of the bearing is connected to the bracket, and the end of the bracket away from the bearing is connected to the truss. The compression spring is used to press the outer ring of the bearing against the surface of the tape. The tape vibration sensor is mounted on the compression spring and is used to detect the vibration of the tape.

[0041] Optionally, the first analysis module includes a first data acquisition unit, a first storage unit, a first computing unit, and a first analysis unit, wherein:

[0042] The first data acquisition unit is used to acquire the vibration displacement of the truss and the tape at different vibration frequencies detected by the vibration detection module;

[0043] The first storage unit stores the resonance influence factor B of the truss and the tape at different vibration frequencies. n And the preset percentage C;

[0044] The first calculation unit is used to calculate the percentage difference A of the vibration displacement based on the vibration displacement of the truss and the tape at different vibration frequencies. n And calculate and obtain the initial resonance indication parameter D0;

[0045] The first analysis unit is used to compare the initial resonance indication parameter D0 with the preset percentage C, and to determine that the truss and the tape resonate under the condition that D0 < C.

[0046] Optionally, the first calculation unit can also calculate and obtain the resonance indication parameter D after each adjustment of the tape tension. m m=1,2,3…, and obtain each resonance indicator parameter D. m The maximum value is D max The tension control module controls the tensioning device to D max The corresponding tape tension is the final tape tension.

[0047] Optionally, it also includes:

[0048] A noise detection module is used to continuously detect the emission noise of the belt conveyor;

[0049] The second analysis module is used to determine whether the belt conveyor's noise emissions exceed the standard based on the detection results of the noise detection module.

[0050] The speed reduction control module is used to reduce the operating speed v1 of the belt conveyor and the feeding speed of the feeder when the noise emission of the belt conveyor exceeds the standard.

[0051] Optionally, the noise detection module includes multiple noise sensors, which are disposed on the conveyor line of the belt conveyor at least in the noise-sensitive area, with a preset distance between adjacent noise sensors.

[0052] Optionally, the second analysis module includes a second data acquisition unit, a second computing unit, a second storage unit, and a second analysis unit, wherein:

[0053] The second data acquisition unit is used to acquire the emission noise value detected by each of the noise sensors;

[0054] The second calculation unit is used to calculate the average emission noise value after removing the maximum and minimum values ​​from the emission noise values ​​detected by each of the noise sensors. The average emission noise value is the output emission noise value b of the corresponding noise sensor. n ;

[0055] The second storage unit stores the noise upper limit value 'a';

[0056] The second analysis unit is used to compare the output emission noise value of each of the noise sensors with the noise upper limit value a, and to compare at least two of the output emission noise values ​​b. nThe belt conveyor is judged to have exceeded the noise emission standard if the noise level is greater than the upper limit value 'a' and the duration is greater than the second preset duration.

[0057] Optionally, the second storage unit also stores the minimum operating bandwidth v1. min The speed reduction control module also ensures that the operating speed v1 of the belt conveyor is lower than the minimum operating belt speed v1. min As a condition, the adjustment of the operating speed v1 of the belt conveyor and the feeding speed of the feeder shall be stopped.

[0058] Optionally, the third analysis module further includes a third calculation unit and a third analysis unit, wherein the third calculation unit is used to obtain the maximum value b of the output emission noise value of each of the noise sensors. max The third analysis unit is capable of using b max <0.85 If the duration is greater than the fourth preset duration, it is determined that the belt conveyor has not fully utilized the environmental emission limits.

[0059] It also includes a speed-up control module, which can increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder based on the condition that the belt conveyor does not fully utilize the environmental emission limits. Attached Figure Description

[0060] Figure 1 A schematic diagram of the structure of a belt conveyor incorporating a noise control device for a belt conveyor according to a specific embodiment of the present invention;

[0061] Figure 2 for Figure 1 A structural diagram of the second angle;

[0062] Figure 3 for Figure 1 A structural diagram of the third angle;

[0063] Figure 4 This is a schematic diagram illustrating the principle of resonance-related noise control in the noise control method for belt conveyors provided by the present invention.

[0064] Figure 5 This is a schematic diagram illustrating the speed-related noise control principle in the noise control method for belt conveyors provided by the present invention.

[0065] in, Figures 1-5 The annotations in the accompanying drawings are explained as follows:

[0066] 100-truss;

[0067] 200-tape;

[0068] 300-Belt vibration detection kit;

[0069] 400-truss vibration sensor;

[0070] 500-Noise sensor. Detailed Implementation

[0071] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0072] The term "multiple" as used in this article usually refers to two or more components; and when "multiple" is used to indicate the quantity of certain components, it does not indicate the relationship between these components in terms of quantity.

[0073] Please refer to Figures 1-4 , Figure 1 A schematic diagram of the structure of a belt conveyor incorporating a noise control device for a belt conveyor according to a specific embodiment of the present invention; Figure 2 for Figure 1 A structural diagram of the second angle; Figure 3 for Figure 1 A structural diagram of the third angle; Figure 4 This is a schematic diagram illustrating the resonance-related noise control principle in the noise control method for belt conveyors provided by the present invention.

[0074] This invention provides a noise control method for a belt conveyor, comprising the following step A:

[0075] The vibration of the truss 100 and the belt 200 during the operation of the belt conveyor is obtained to determine whether the truss 100 and the belt 200 resonate. If so, the belt tension is adjusted within the safe range of belt tension to change the vibration frequency of the belt 200 and eliminate or reduce the resonance between the truss 100 and the belt 200.

[0076] Research has revealed that a significant portion of the operating noise of belt conveyors originates from the synchronous vibration of the steel structure (truss 100) and the conveyor belt 200. Therefore, the noise control method for belt conveyors of this invention first obtains the vibration data of the truss 100 and the conveyor belt 200 during operation. Based on the vibration data, it determines whether resonance occurs between the truss 100 and the conveyor belt 200. Once resonance is confirmed, the belt tension can be adjusted using a power tensioning device. The change in belt tension alters the tension of the conveyor belt 200, resulting in a change in the vibration frequency of the conveyor belt 200. This eliminates or reduces the resonance phenomenon between the truss 100 and the conveyor belt 200, thereby reducing the operating noise of the belt conveyor.

[0077] Among them, the power tensioning device can adopt electric winch type tensioning device or hydraulic tensioning device, etc., to adjust the belt tension of the belt conveyor according to the control requirements, and change the coupling vibration frequency of the belt 200 and the steel structure by changing the belt tension. The power tensioning device is existing technology and will not be described in detail here.

[0078] In practice, the vibration of the tape 200 can be detected by the tape vibration detection assembly 300. The tape vibration detection assembly 300 includes a tape vibration sensor and a fixing component. The fixing component includes a bearing, a bracket, and a compression spring. The inner ring of the bearing is connected to the bracket, and the end of the bracket away from the bearing is connected to the truss 100. The compression spring is used to press the outer ring of the bearing against the surface of the tape 200 to ensure that the bearing and the tape 200 are always in close contact. The tape vibration sensor is installed on the compression spring to detect the vibration of the tape 200, and the detection sensitivity is higher.

[0079] In practice, the vibration of truss 100 can be detected by truss vibration sensor 400, which can be directly and rigidly fixed to truss 100.

[0080] In step A, the vibration of the truss 100 and the conveyor belt 200 during operation is obtained to determine whether resonance occurs between the truss 100 and the conveyor belt 200. This specifically includes the following steps:

[0081] Obtain the vibration displacements of truss 100 and tape 200 at different vibration frequencies, and obtain the percentage difference A of vibration displacements based on the vibration displacements of truss 100 and tape 200 at the corresponding vibration frequencies. n n=1,2,3…;

[0082] Obtain the resonance influence factor B at different vibration frequencies n For n=1,2,3…, if the preset condition is met, truss 100 and tape 200 will resonate. The preset condition is D0<C.

[0083] Where D0 is the initial resonance indicator parameter, D0 = B1A1 + B2A2 + B3A3 + … + B n A n C represents the preset percentage.

[0084] Specifically, after obtaining the vibration displacements of the truss 100 and the conveyor belt 200 at different vibration frequencies, the percentage difference A between the vibration displacements of the truss and the conveyor belt at the corresponding vibration frequency can be obtained by dividing the difference between the truss vibration displacement and the conveyor belt vibration displacement by the larger of the two values. n .

[0085] In practice, the vibration displacements of truss 100 and conveyor belt 200 at vibration frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, and 8000Hz can be selected based on experience. The percentage difference in vibration displacement at the corresponding vibration frequencies is A1~A8 respectively. According to the on-site noise monitoring results of the belt conveyor operation, the noise with a greater impact on the surrounding environment is concentrated in the low-to-mid frequency range. Therefore, in order to comprehensively judge the degree of resonance's impact on noise, the resonance influence factors B1~B8 are determined to be 0.1, 0.15, 0.25, 0.35, 0.05, 0.05, 0.025, and 0.025 respectively, with C=10%. At this time, the preset conditions are:

[0086] 0.1A1+0.15A2+0.25A3+0.35 A4+0.05 A5+0.05 A6+0.025 A7+0.025 A8<10%.

[0087] If the above preset conditions are met, the vibration displacements of the truss 100 and the tape 200 at the corresponding vibration frequencies are relatively close, indicating that the vibrations generated by the truss 100 and the tape 200 are superimposed, and the truss 100 and the tape 200 resonate; if the above preset conditions are not met, the truss 100 and the tape 200 do not resonate.

[0088] In step A, the tape tension is adjusted within the safe range to change the vibration frequency of tape 200, specifically including the following steps:

[0089] Each adjustment of the tape tension is approximately 5% of the current tape tension. The resonance indicator parameter D after each tension adjustment is calculated. m m=1,2,3…; each resonance indicator parameter D m The maximum value is D max D max The corresponding tape tension is determined as the final tape tension.

[0090] It's understandable, D m The larger the diameter, the weaker the resonance phenomenon between truss 100 and tape 200. After adjustment, D... max If D ≥ C, it indicates that the resonance between truss 100 and tape 200 has been eliminated; if after adjustment, D max <C indicates that the resonance between truss 100 and tape 200 has been reduced, but the resonance phenomenon between truss 100 and tape 200 has not been completely eliminated. At this time, the resonance phenomenon between truss 100 and tape 200 is the weakest.

[0091] In practice, the safe range of belt tension is determined by the upper limit of belt tension and the lower limit of belt non-slippage. The upper limit of belt tension can be obtained by dividing the allowable belt strength of 200 by the safety factor. The lower limit of belt non-slippage can be calculated using Euler's formula. For details, please refer to the "Belt Conveyor Design Manual". As this is common knowledge, it will not be elaborated here.

[0092] Please refer to Figures 1-3 and Figure 5 , Figure 5 This is a schematic diagram illustrating the speed-related noise control principle in the noise control method for belt conveyors provided by the present invention.

[0093] Furthermore, the noise control method for the belt conveyor of the present invention, after step A, further includes the following step B:

[0094] Step B1: Continuously monitor the emission noise of the belt conveyor;

[0095] Step B2: Determine whether the noise emission of the belt conveyor exceeds the standard. If so, reduce the running speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B2 after the first preset running time.

[0096] Research has shown that the operating noise of belt conveyors, in addition to the vibration of the steel structure and the belt 200 at the same frequency, is also related to the friction noise between the idler rollers and the belt 200. The friction noise between the idler rollers and the belt 200 depends on the operating speed of the belt conveyor. Therefore, if the noise of the belt conveyor still does not reach the expected value after adjusting the belt tension, it may affect the normal life of people in noise-sensitive areas. This invention reduces the friction noise between the idler rollers and the belt 200 by reducing the operating speed v1 of the belt conveyor and the feeding speed of the feeder, thereby further reducing the operating noise of the belt conveyor.

[0097] In step B2, if the noise emission of the belt conveyor does not exceed the standard, return to step A to monitor the resonance phenomenon of the truss and belt.

[0098] The detection of noise emissions from belt conveyors specifically includes the following steps:

[0099] A noise sensor 500 is arranged at a preset interval along the conveyor line of the belt conveyor, at least in the noise-sensitive area. The noise sensor 500 detects the emission noise value a preset number of times per second.

[0100] To determine whether a belt conveyor's noise emissions exceed standards, the following steps are involved:

[0101] After removing the maximum and minimum values ​​of the emission noise detected by noise sensor 500, the average emission noise value is calculated. The average emission noise value is the corresponding output emission noise value b of noise sensor 500. n n=1,2,3…;

[0102] Compare the output emission noise values ​​b of each noise sensor 500 n And the upper limit of noise 'a', if at least two output emission noise values ​​'b' n If the noise level exceeds the upper limit value 'a' and the duration exceeds the second preset duration, then the noise emission of the belt conveyor exceeds the standard.

[0103] As set above, to determine if the noise emission of a belt conveyor exceeds the standard, at least two emission noise values ​​b should be met simultaneously. n The noise emission of the belt conveyor is considered to be within the standard if either of the following two conditions is not met: the noise level is greater than the upper limit value 'a' and the duration is greater than the second preset duration. This avoids interference from other accidental factors.

[0104] like Figure 3 As shown, noise-sensitive areas include residential areas, villages, etc., and noise sensors 500 can be installed on at least one side of the belt conveyor. In this embodiment, the noise sensors 500 are arranged at a spacing of 50 meters along the conveyor line in the noise-sensitive area. In practice, the spacing between two adjacent noise sensors 500 can be adaptively adjusted according to requirements.

[0105] Preferably, the noise sensor 500 collects emission noise values ​​10 times per second, and calculates the average emission noise value after removing the maximum and minimum values. This can eliminate the influence of extreme values ​​on the average value and better reflect the noise emission situation.

[0106] According to the "Noise Pollution Prevention and Control Law of the People's Republic of China", noise control at night (10 p.m. to 6 a.m. the next day) must be subject to stricter standards. Therefore, the aforementioned upper limit value 'a' includes the upper limit value 'a1' at night and the upper limit value 'a2' during the day. It can be understood that the upper limit value 'a1' at night is lower than the upper limit value 'a2' during the day.

[0107] In practice, the second preset duration is preferably 3 seconds.

[0108] Specifically, when reducing the operating speed v1 of the belt conveyor and the feeding speed of the feeder, the operating frequency can be controlled to decrease by 1Hz every 2 seconds, and after each 1Hz decrease, the belt can run for 30 seconds at that speed, that is, the aforementioned first preset duration can be 30 seconds.

[0109] Of course, the specific values ​​of the first and second preset durations mentioned above are only illustrative examples and can be adjusted adaptively according to actual control needs.

[0110] To avoid impacting normal production, when adjusting the operating speed v1 of the belt conveyor, it must be ensured that the operating speed v1 is never lower than the minimum operating belt speed v1. min Minimum operating belt speed v1 min The calculation is as follows:

[0111]

[0112] In the formula:

[0113] —Minimum transport capacity;

[0114] —Maximum transport capacity;

[0115] —Rated operating belt speed.

[0116] Furthermore, in the noise control method for the belt conveyor of the present invention, step B further includes:

[0117] Step B3: Determine whether the belt conveyor fully utilizes the environmental emission limits. If not, increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B3 after the third preset running time.

[0118] Determining whether a belt conveyor fully utilizes environmental emission limits includes the following steps:

[0119] Obtain the maximum value b of the output emission noise value b of each noise sensor 500. max If b max <0.85 a. If the duration is greater than the fourth preset duration, then the belt conveyor has not fully utilized the environmental emission limits.

[0120] As set above, b max <0.85 If step a) occurs and the duration exceeds the fourth preset time, it indicates that the current operating speed v1 of the belt conveyor is too low and is not fully utilizing the environmental emission limits. In this case, the operating speed v1 of the belt conveyor and the feeding speed of the feeder can be increased. After the third preset time, step B3 can be repeated until step b) occurs. max ≥0.85 a) Alternatively, if the duration is no greater than the fourth preset duration, then the operating speed v1 of the belt conveyor and the feeding speed of the feeder will no longer be increased. In this way, while ensuring compliance with national noise emission standards, the normal operation of the belt conveyor is maximized, and the carrying capacity is increased.

[0121] It is understandable that to determine if the current operating speed v1 of the belt conveyor is too low, b should be satisfied simultaneously.max <0.85 The two conditions, a and a duration greater than the fourth preset duration, are met. If either condition is not met, the current operating speed v1 of the belt conveyor can be considered normal.

[0122] The fourth preset duration is preferably 5 seconds.

[0123] Among them, when increasing the running speed v1 of the belt conveyor and the feeding speed of the feeder, the running frequency can be controlled to increase by 1Hz every 2 seconds, and after each increase of 1Hz, it runs at that speed for 30 seconds, that is, the aforementioned third preset duration can be 30 seconds.

[0124] Of course, the specific values ​​of the third and fourth preset durations mentioned above are only illustrative examples and can be adjusted adaptively according to actual control needs.

[0125] It is understood that the aforementioned belt conveyor can be a tubular belt conveyor, a trough belt conveyor, a flexible tubular belt conveyor, etc.

[0126] The present invention also provides a noise control device for a belt conveyor, comprising:

[0127] The vibration detection module is used to detect the vibration of the truss 100 and the belt 200 during the operation of the belt conveyor;

[0128] The first analysis module is used to determine whether the truss 100 and the tape 200 resonate based on the detection results of the vibration detection module.

[0129] The tension control module is used to control the tensioning device to adjust the belt tension within the safe range of the belt tension, based on the condition that the truss 100 and the belt 200 resonate, so as to change the vibration frequency of the belt 200 and eliminate or reduce the resonance between the truss 100 and the belt 200.

[0130] The noise control device for the belt conveyor of the present invention is used to implement the aforementioned noise control method for the belt conveyor, and therefore has the same technical effect as the aforementioned noise control method for the belt conveyor, which will not be repeated here.

[0131] The vibration detection module includes a truss vibration sensor 400 and a tape vibration detection assembly 300, specifically:

[0132] The truss vibration sensor 400 is fixed to the truss and is used to detect the vibration of the truss.

[0133] The tape vibration detection assembly 300 includes a tape vibration sensor and a fixing component. The fixing component includes a bearing, a bracket, and a compression spring. The inner ring of the bearing is connected to the bracket, and the end of the bracket away from the bearing is connected to a truss. The compression spring is used to press the outer ring of the bearing against the surface of the tape 200. The tape vibration sensor is mounted on the compression spring and is used to detect the vibration of the tape 200.

[0134] With the above settings, the vibration of the tape 200 can be directly reflected on the compression spring. By installing the tape vibration sensor on the compression spring, the tape vibration sensor can detect the vibration of the tape 200 more sensitively, thereby improving the detection accuracy and the reliability of the detection results.

[0135] The truss vibration sensor 400 and the tape vibration sensor are conventional vibration sensors, and will not be described in detail here.

[0136] The first analysis module includes a first data acquisition unit, a first storage unit, a first computing unit, and a first analysis unit, specifically:

[0137] The first data acquisition unit is used to collect the vibration displacement of the truss 100 and the tape 200 at different vibration frequencies detected by the vibration detection module.

[0138] The first storage unit stores the resonance influence factor B at different vibration frequencies. n And the preset percentage C;

[0139] The first calculation unit is used to calculate the percentage difference A of the vibration displacement based on the vibration displacement of the truss 100 and the tape 200 at different vibration frequencies. n And calculate and obtain the initial resonance indication parameter D0;

[0140] The first analysis unit is used to compare the initial resonance indication parameter D0 with the preset percentage C, and to determine whether the truss 100 and the tape 200 resonate, with D0 < C as the condition.

[0141] As set up above, in practice, the first calculation unit can retrieve the data collected by the first data acquisition unit for calculation, and the first analysis unit can retrieve the stored data of the first storage unit and the calculated data of the first calculation unit for comparison and analysis to determine whether the truss 100 and the tape 200 resonate.

[0142] Furthermore, the first calculation unit can also calculate and obtain the resonance indication parameter D after each adjustment of the tape tension. m m=1,2,3…, and obtain each resonance indicator parameter D. m The maximum value is D max The tension control module controls the tensioning device to use D maxThe corresponding tape tension is the final tape tension.

[0143] It's understandable, D m The larger the value, the weaker the resonance phenomenon between truss 100 and tape 200. Therefore, if D is used... max The corresponding tape tension is the final tape tension. At this point, the resonance phenomenon between truss 100 and tape 200 is weakest or has been eliminated. Specifically, if after adjustment, D max If D ≥ C, it indicates that the resonance between truss 100 and tape 200 has been eliminated; if after adjustment, D max <C indicates that the resonance between truss 100 and tape 200 has been reduced, but the resonance phenomenon between truss 100 and tape 200 has not been completely eliminated. At this time, the resonance phenomenon between truss 100 and tape 200 is the weakest.

[0144] Furthermore, the noise control device for the belt conveyor of the present invention further includes:

[0145] A noise detection module is used to continuously detect the emission noise of the belt conveyor;

[0146] The second analysis module is used to determine whether the belt conveyor's noise emissions exceed the standard based on the detection results from the noise detection module.

[0147] The speed reduction control module is used to reduce the operating speed v1 of the belt conveyor and the feeding speed of the feeder at each first preset time interval, based on the condition that the noise emission of the belt conveyor exceeds the standard.

[0148] The noise control device for the belt conveyor of the present invention further includes a noise detection module, a second analysis module, and a speed reduction control module. After adjusting the belt tension, the noise emission of the belt conveyor can be continuously detected by the noise detection module. If the noise emission of the belt conveyor still exceeds the standard after adjusting the belt tension, the speed reduction control module reduces the running speed v1 of the belt conveyor and the feeding speed of the feeder. After running at the running speed v1 for a first preset time, the action is repeated until the problem of excessive noise emission of the belt conveyor is solved. At this time, the speed reduction control module is in a monitoring state, reducing the friction noise between the idler roller and the belt 200, and further achieving the purpose of reducing the operating noise of the belt conveyor.

[0149] The noise detection module includes multiple noise sensors 500, which are installed on the conveyor line of the belt conveyor, at least in the noise-sensitive area, with a preset distance between adjacent noise sensors 500.

[0150] As mentioned earlier, noise-sensitive areas include residential areas, villages, etc., and noise sensors 500 can be installed on at least one side of the belt conveyor. In this embodiment, the noise sensors 500 are arranged at a spacing of 50 meters along the conveyor line in the noise-sensitive area. In practice, the spacing between two adjacent noise sensors 500 can be adaptively adjusted according to requirements.

[0151] Furthermore, the second analysis module includes a second data acquisition unit, a second computing unit, a second storage unit, and a second analysis unit, wherein:

[0152] The second data acquisition unit is used to acquire the emission noise values ​​detected by each noise sensor 500;

[0153] The second calculation unit is used to calculate the average emission noise value after removing the maximum and minimum values ​​from the emission noise values ​​detected by each noise sensor 500. The average emission noise value is the output emission noise value b of the corresponding noise sensor 500. n ;

[0154] The second storage unit stores the noise upper limit value 'a';

[0155] The second analysis unit is used to compare the output emission noise value of each noise sensor 500 with the upper noise limit value a, and to compare at least two output emission noise values ​​b. n The belt conveyor is judged to have exceeded the noise emission standard if the noise level is greater than the upper limit value 'a' and the duration is greater than the second preset duration.

[0156] As set up above, in practice, the second calculation unit can retrieve the data collected by the first data acquisition unit for calculation, and calculate the average emission noise value after removing the maximum and minimum values. This can eliminate the influence of extreme values ​​on the average value and better reflect the noise emission situation. The second analysis unit can retrieve the stored data of the second storage unit and the calculated data of the second calculation unit for comparison and analysis to determine whether the noise emission of the belt conveyor exceeds the standard, so that the speed reduction control module can adjust the running speed v1 of the belt conveyor and the feeding speed of the feeder.

[0157] The noise upper limit value 'a' includes a nighttime upper limit value 'a1' and a daytime upper limit value 'a2'.

[0158] The first preset duration is preferably 30 seconds; the second preset duration is preferably 3 seconds. Of course, the specific values ​​of the first and second preset durations are only illustrative examples and can be adjusted adaptively according to actual control requirements.

[0159] Furthermore, the second storage unit also stores the minimum operating bandwidth v1. min The speed reduction control module ensures that the operating speed v1 of the belt conveyor is not lower than the minimum operating belt speed v1. minAs conditions, the running speed v1 of the belt conveyor and the feeding speed of the feeder are adjusted.

[0160] With the above settings, when adjusting the operating speed v1 of the belt conveyor, ensure that the operating speed v1 of the belt conveyor is always not lower than the minimum operating belt speed v1. min This can avoid affecting normal production.

[0161] Furthermore, in the noise control device for the belt conveyor of the present invention, the third analysis module further includes a third calculation unit and a third analysis unit. The third calculation unit is used to obtain the maximum output emission noise value b output by each noise sensor 500. max The third analysis unit can be b max <0.85 a) and the duration is greater than the fourth preset duration, it is determined that the belt conveyor has not fully utilized the environmental emission limits.

[0162] It also includes a speed-up control module, which can increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder every third preset time interval, based on the condition that the belt conveyor is not fully utilizing the environmental emission limits.

[0163] As set above, if b max <0.85 If, a, the duration exceeds the fourth preset time, it indicates that the current operating speed v1 of the belt conveyor is too low and is not fully utilizing the environmental emission limits. In this case, the operating speed v1 of the belt conveyor and the feeding speed of the feeder can be increased, and the operation can be repeated after the third preset time until b. max ≥0.85 Alternatively, if the duration is no greater than the fourth preset duration, the operating speed v1 of the belt conveyor and the feeding speed of the feeder will no longer be increased. In this case, the speed-up control module is in a listening state. Thus, while ensuring compliance with national noise emission standards, the normal operation of the belt conveyor is maximized, and the carrying capacity is increased.

[0164] The third preset duration is preferably 30 seconds; the fourth preset duration is preferably 5 seconds. Of course, the specific values ​​of the third and fourth preset durations are only illustrative examples and can be adjusted adaptively according to actual control needs.

[0165] The noise control method for a belt conveyor provided by this invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principle of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A noise control method for a belt conveyor, characterized in that, Includes the following step A: The vibration of the truss and belt during the operation of the belt conveyor is obtained, and it is determined whether the truss and the belt resonate. If so, the belt tension is adjusted within the safe range of belt tension to change the vibration frequency of the belt. To obtain information on the vibration of the truss and belt during the operation of a belt conveyor and to determine whether resonance occurs between the truss and the belt, the following steps are included: The vibration displacements of the truss and the tape at different vibration frequencies are obtained, and the percentage difference A between the vibration displacements is obtained based on the vibration displacements of the truss and the tape at different vibration frequencies. n n=1,2,3…; Obtain the resonance influence factor B at different vibration frequencies n If n=1,2,3…, and a preset condition is met, the truss and the tape will resonate. The preset condition is D0<C, where D0 is the initial resonance indicator parameter, and D0=B1A1+B2A2+B3A3+…+B n A n C represents the preset percentage; Adjusting the tape tension within the safe range to change the vibration frequency of the tape specifically includes the following steps: Each adjustment of the tape tension is approximately 5% of the current tape tension. The resonance indicator parameter D after each tension adjustment is calculated. m m=1,2,3…; each resonance indicator parameter D m The maximum value is D max D max The corresponding tape tension is determined as the final tape tension.

2. The noise control method for a belt conveyor according to claim 1, characterized in that, Following step A, the following step B is also included: Step B1: Continuously monitor the emission noise of the belt conveyor; Step B2: Determine whether the noise emission of the belt conveyor exceeds the standard. If so, reduce the operating speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B2 after running for a first preset time.

3. The noise control method for a belt conveyor according to claim 2, characterized in that, Continuously monitoring the emission noise of the belt conveyor specifically includes the following steps: A noise sensor is arranged at preset intervals along the conveyor line of the belt conveyor, at least in the noise-sensitive area, and the noise sensor detects the emission noise value a preset number of times per second; Determining whether the belt conveyor exceeds noise emission standards involves the following steps: After removing the maximum and minimum values ​​from the emission noise values ​​detected by the noise sensor, the average emission noise value is calculated. The average emission noise value is the corresponding output emission noise value b of the noise sensor. n n=1,2,3…; Compare the output emission noise value b of each of the noise sensors n And the upper limit of noise value a, if at least two of the output emission noise values ​​b n If the noise level exceeds the upper limit value 'a' and the duration exceeds the second preset duration, then the noise emission of the belt conveyor exceeds the standard.

4. The noise control method for a belt conveyor according to claim 3, characterized in that, The noise upper limit value a includes a nighttime upper limit value a1 and a daytime upper limit value a2.

5. The noise control method for a belt conveyor according to claim 2, characterized in that, The operating speed v1 of the belt conveyor should not be lower than the minimum operating belt speed v1. min Minimum operating belt speed v1 min The calculation is as follows: ； In the formula: —Minimum transport capacity; —Maximum transport capacity; —Rated operating belt speed.

6. The noise control method for a belt conveyor according to claim 3, characterized in that, Step B further includes: Step B3: Determine whether the belt conveyor fully utilizes the environmental emission limits. If not, increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder, and repeat step B3 after running for a third preset time.

7. The noise control method for a belt conveyor according to claim 6, characterized in that, Determining whether the belt conveyor fully utilizes environmental emission limits includes the following steps: Obtain the maximum value b of the output emission noise value b of each of the noise sensors. max If b max If the value is less than 0.85*a and the duration is greater than the fourth preset duration, then the belt conveyor has not fully utilized the environmental emission limits.

8. A noise control device for a belt conveyor, characterized in that, include: The vibration detection module is used to detect the vibration of the truss and belt during the operation of the belt conveyor; The first analysis module is used to determine whether the truss and the tape resonate based on the detection results of the vibration detection module. The tension control module is used to control the tensioning device to adjust the belt tension within the safe range of belt tension, based on the condition that the truss and the belt resonate, so as to change the vibration frequency of the belt and eliminate or reduce the resonance between the truss and the belt. The vibration detection module includes a truss vibration sensor and a tape vibration detection component, wherein: The truss vibration sensor is fixed to the truss and is used to detect the vibration of the truss. The tape vibration detection assembly includes a tape vibration sensor and a fixing component. The fixing component includes a bearing, a bracket, and a compression spring. The inner ring of the bearing is connected to the bracket, and the end of the bracket away from the bearing is connected to the truss. The compression spring is used to press the outer ring of the bearing against the surface of the tape. The tape vibration sensor is mounted on the compression spring and is used to detect the vibration of the tape. The first analysis module includes a first data acquisition unit, a first storage unit, a first computing unit, and a first analysis unit, wherein: The first data acquisition unit is used to acquire the vibration displacement of the truss and the tape at different vibration frequencies detected by the vibration detection module; The first storage unit stores the resonance influence factor B at different vibration frequencies. n And the preset percentage C; The first calculation unit is used to calculate and obtain the percentage difference A of vibration displacement based on the vibration displacement of the truss and the tape at different vibration frequencies. n And calculate and obtain the initial resonance indication parameter D0; The first analysis unit is used to compare the initial resonance indication parameter D0 with the preset percentage C, and to determine whether the truss and the tape resonate, with D0 < C as the condition. The first calculation unit can also calculate and obtain the resonance indicator parameter D after each adjustment of the tape tension. m m=1,2,3…, and obtain each resonance indicator parameter D. m The maximum value is D max The tension control module controls the tensioning device to D max The corresponding tape tension is the final tape tension.

9. The noise control device for a belt conveyor according to claim 8, characterized in that, Also includes: A noise detection module is used to continuously detect the emission noise of the belt conveyor; The second analysis module is used to determine whether the belt conveyor's noise emissions exceed the standard based on the detection results of the noise detection module. The speed reduction control module is used to reduce the operating speed v1 of the belt conveyor and the feeding speed of the feeder at intervals of a first preset time period, based on the condition that the noise emission of the belt conveyor exceeds the standard.

10. The noise control device for a belt conveyor according to claim 9, characterized in that, The noise detection module includes multiple noise sensors, which are installed on the conveyor line of the belt conveyor, at least in the noise-sensitive area, with a preset distance between adjacent noise sensors.

11. The noise control device for a belt conveyor according to claim 10, characterized in that, The second analysis module includes a second data acquisition unit, a second computing unit, a second storage unit, and a second analysis unit, wherein: The second data acquisition unit is used to acquire the emission noise value detected by each of the noise sensors; The second calculation unit is used to calculate the average emission noise value after removing the maximum and minimum values ​​from the emission noise values ​​detected by each of the noise sensors. The average emission noise value is the output emission noise value b of the corresponding noise sensor. n ; The second storage unit stores the noise upper limit value 'a'; The second analysis unit is used to compare the output emission noise value of each of the noise sensors with the noise upper limit value a, and to compare at least two of the output emission noise values ​​b. n The belt conveyor is judged to have exceeded the noise emission standard if the noise level is greater than the upper limit value 'a' and the duration is greater than the second preset duration.

12. The noise control device for a belt conveyor according to claim 11, characterized in that, The second storage unit also stores the minimum operating bandwidth v1. min The speed reduction control module ensures that the operating speed v1 of the belt conveyor is not lower than the minimum operating belt speed v1. min As conditions, the operating speed v1 of the belt conveyor and the feeding speed of the feeder are adjusted.

13. The noise control device for a belt conveyor according to claim 11, characterized in that, The third analysis module further includes a third calculation unit and a third analysis unit, wherein the third calculation unit is used to obtain the maximum value b of the output emission noise value of each of the noise sensors. max The third analysis unit is capable of using b max If the value is less than 0.85*a and the duration is greater than the fourth preset duration, it is determined that the belt conveyor has not fully utilized the environmental emission limits. It also includes a speed-up control module, which can increase the operating speed v1 of the belt conveyor and the feeding speed of the feeder every third preset time interval, based on the condition that the belt conveyor is not fully utilizing the environmental emission limits.

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