Belt anti-tearing control method and system

Abstract

The invention provides a belt anti-tearing control method and system. The belt anti-tearing control method comprises the steps that S1, the linear relation between the bearing load of a belt conveyor and the current of a motor is obtained; s2, sequentially setting a first current interval, a second current interval and a third current interval from small to large; s3, when the current of the motor is in the first current interval, the material leading-in speed of the starting end of the belt conveyor is maintained, and the belt conveyor continues to work; s4, when the current of the motor is in a second current interval, the material leading-in speed of the starting end of the belt conveyor is slowed down, and the belt conveyor continues to work; and S5, when the current of the motor is in a third current interval, the materials are stopped from being guided into the starting end of the belt conveyor, and the belt conveyor continues to work. By means of the belt anti-tearing control method, the situation that the load borne by the belt conveyor is too large can be avoided, then the belt can be effectively prevented from being torn, and the service life of the belt is prolonged.

Description

Technical Field

[0001] The present application relates to the field of belt conveyors, and in particular to a belt tear prevention control method and system. Background Art

[0002] In the hydrometallurgical process of laterite nickel ore, the ore is typically washed to separate the larger gravel and crushed stone from the ore. The separated gravel and crushed stone are often transported using a conveyor belt. Due to the varying gravel and crushed stone content of laterite nickel ore depending on its source and batch, the amount of gravel and crushed stone required for washing varies significantly. Using a high-load-capacity conveyor belt has limited utilization, while using a lower-load-capacity conveyor belt often exceeds its maximum load, leading to belt tears.

[0003] Currently, because belt overload is relatively rare, the mainstream approach is to mitigate risks by detecting the extent of belt tears. For example, Chinese invention patent application number CN201911262032.8 uses visual images to determine the extent of belt tears, facilitating belt inspection and replacement. However, this detection method only provides timely information on the extent of belt damage and cannot prevent the belt from carrying excessive loads, nor can it extend the belt's lifespan.

[0004] Application Contents The purpose of this application is to overcome the above technical deficiencies, propose a belt anti-tear control method and system, and solve the technical problem of how to avoid belt tearing in the prior art.

[0005] In order to achieve the above technical objectives, this application adopts the following technical solutions: In one aspect, the present application provides a belt tear prevention control method, comprising: S1. Obtain the linear relationship between the belt conveyor load and the motor current; S2. Setting the first current interval, the second current interval, and the third current interval in ascending order; S3. When the motor current is in the first current interval, the material introduction speed at the starting end of the belt conveyor is maintained and the belt conveyor continues to work; S4. When the motor current is in the second current interval, the material introduction speed at the starting end of the belt conveyor is slowed down, and the belt conveyor continues to work; S5. When the motor current is in the third current interval, the introduction of materials to the starting end of the belt conveyor is stopped, and the belt conveyor continues to work.

[0006] In some embodiments, step S5 includes: When the motor current is in the third current interval, the belt conveyor is controlled to continue working for a preset time; Within the preset time, if the motor current recovers to the first current interval, step S3 is executed; if the motor current recovers to the second current interval, step S4 is executed; if the motor current is still in the third current interval, stop introducing materials to the starting end of the belt conveyor and control the belt conveyor to stop.

[0007] In some embodiments, the preset time is 5 seconds.

[0008] In some embodiments, the control method further includes: When the motor current is lower than the minimum value of the first current interval, the material introduction speed at the starting end of the belt conveyor is increased.

[0009] In some embodiments, step S1 includes: Select several groups of material samples of different weights; Several groups of material samples are sequentially conveyed through a belt conveyor, and motor current data corresponding to the conveyed material samples are respectively obtained; The linear relationship between the belt conveyor load and the motor current at the same speed is fitted based on the material sample and motor current data.

[0010] In some embodiments, step S2 includes: Select different ambient temperatures; Test the load limit of the belt at different ambient temperatures; Establish a correlation between ambient temperature and belt load limit; According to the belt load limit, the first load range, the second load range and the third load range are set in order from small to large; Obtain the linear relationship between the belt conveyor load and motor current at different ambient temperatures; The first current interval, the second current interval, and the third current interval are set in a one-to-one correspondence according to the first load interval, the second load interval, and the third load interval.

[0011] In some embodiments, a method of testing a belt's load limit includes: Select two marking points on the belt; Set the limit distance between two marking points; And obtain the actual distance between two marking points when they are on the close edge in real time; Gradually increase the weight of the mineral sample carried by the conveyor belt until the actual spacing is equal to the limit spacing; The weight of the mineral sample at this time is the load limit of the belt.

[0012] In some embodiments, the actual distance between two marking points when they are close to each other is obtained in real time by measuring with a laser rangefinder.

[0013] In some embodiments, the two marking points are located along the edge of the belt.

[0014] On the other hand, the present application provides a belt anti-tear control system, which includes a support frame, a belt, a controller, a motor, a current sensor and a material introduction device. The belt is installed on the support frame, the motor is connected to the belt to drive the belt to rotate, the current sensor is used to detect the working current of the motor, and the material introduction device is used to introduce material into the belt. The controller is communicated with the current sensor, the motor and the material introduction device respectively, and the controller applies the above-mentioned belt anti-tear control method.

[0015] First, obtain the linear relationship between the load carried by the belt conveyor and the motor current, and then set the first current interval, the second current interval, and the third current interval in sequence. When the motor is in the first current interval, it indicates that the load carried by the belt conveyor is within a reasonable range, and the material introduction speed at the starting end of the belt conveyor can be maintained. When the motor is in the second current interval, it indicates that the load carried by the belt conveyor is large, and it is necessary to slow down the material introduction speed at the starting end of the belt conveyor and reduce the load carried by the belt conveyor. When the motor is in the third current interval, it indicates that the load carried by the belt conveyor is too large, and then stop introducing materials to the starting end of the belt conveyor, and quickly reduce the load carried by the belt conveyor. The belt anti-tearing control method provided by the present application can avoid excessive load carried by the belt conveyor, and thus effectively prevent the belt from tearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the belt tear prevention control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0018] In order to extend the service life of the belt and avoid it from tearing due to overload, the present application provides a belt anti-tear control method, which can avoid the belt conveyor from carrying too much load, thereby effectively preventing the belt from tearing, thereby extending the service life of the belt.

[0019] It should be noted that the belt tear control method described in this application is applicable to, but not limited to, conveyors. For ease of explanation, this application only uses the belt tear control method applied to conveyors as an example. The principles of applying the belt tear control method to other types of equipment are essentially the same as those used in conveyors, and are not detailed here. In other words, the belt tear control method described in this application is not limited to preventing tearing of belts in the laterite nickel ore washing process due to differences in gravel content, but can also be used to prevent tearing of belts in the transportation of other unstable materials.

[0020] See also Figure 1 , Figure 1 This is a flow chart of a belt anti-tear control method in one embodiment of the present application. The belt anti-tear control method includes: S1. Obtain the linear relationship between the belt conveyor load and the motor current; S2, setting a first current interval, a second current interval, and a third current interval in order from small to large; S3. When the motor current is in the first current interval, the material introduction speed at the starting end of the belt conveyor is maintained and the belt conveyor continues to work; S4. When the motor current is in the second current interval, the material introduction speed at the starting end of the belt conveyor is slowed down, and the belt conveyor continues to work; S5. When the motor current is in the third current interval, the introduction of materials to the starting end of the belt conveyor is stopped, and the belt conveyor continues to work.

[0021] In this embodiment, the linear relationship between the load carried by the belt conveyor and the motor current is first obtained, and then the continuous first current interval, second current interval and third current interval are set in sequence. When the motor is in the first current interval, it indicates that the load carried by the belt conveyor is within a reasonable range, and the material introduction speed at the starting end of the belt conveyor can be maintained. When the motor is in the second current interval, it indicates that the load carried by the belt conveyor is large, and it is necessary to slow down the material introduction speed at the starting end of the belt conveyor and reduce the load carried by the belt conveyor. When the motor is in the third current interval, it indicates that the load carried by the belt conveyor is too large, and then the introduction of materials to the starting end of the belt conveyor is stopped, and the load carried by the belt conveyor is quickly reduced. The belt anti-tearing control method provided by the present application can avoid excessive load on the belt conveyor, and thus effectively prevent belt tearing.

[0022] It is understood that the specific values ​​of the first, second, and third current intervals are related to the specific specifications of the belt conveyor. To facilitate those skilled in the art to clearly understand how to set the continuous first, second, and third current intervals, a feasible embodiment is provided as an exemplary illustration of the specific values ​​of the first, second, and third current intervals, where the first current interval is [5A, 10A), the second current interval is [10A, 15A), and the third current interval is [15A, ∞].

[0023] In some embodiments, step S5 includes: When the motor current is in the third current interval, the belt conveyor is controlled to continue working for a preset time; Within the preset time, if the motor current recovers to the first current interval, step S3 is executed; if the motor current recovers to the second current interval, step S4 is executed; if the motor current is still in the third current interval, stop introducing materials to the starting end of the belt conveyor and control the belt conveyor to stop.

[0024] In this embodiment, when the motor current is in the third current range, it indicates that the belt conveyor is carrying a heavy load. If the motor current returns to the first current range or the second current range within a preset time, it indicates that the load on the belt conveyor has dropped to a tolerable range, and material can be continued to be introduced to the starting end of the belt conveyor. If the motor current remains in the third current range for a preset time, it indicates that the load on the belt conveyor has not dropped to a tolerable range, and the belt conveyor needs to be shut down to prevent belt tearing and damage.

[0025] Based on the above embodiments, in some embodiments, the preset time is 5 seconds.

[0026] In some embodiments, the control method further includes: When the motor current is lower than the minimum value of the first current interval, the material introduction speed at the starting end of the belt conveyor is increased.

[0027] In this embodiment, when the motor current is lower than the first current range, it indicates that the load borne by the belt conveyor is low, so the material introduction speed at the starting end of the belt conveyor can be increased, thereby increasing the load borne by the belt conveyor, which helps to fully utilize the carrying capacity of the belt conveyor and ensure its conveying efficiency.

[0028] In some embodiments, step S1 includes: Select several groups of material samples of different weights; Several groups of material samples are sequentially conveyed through a belt conveyor, and motor current data corresponding to the conveyed material samples are respectively obtained; The linear relationship between the belt conveyor load and the motor current at the same speed is fitted based on the material sample and motor current data.

[0029] In this example, several groups of material samples of varying weights were selected and sequentially conveyed through a belt conveyor, thereby obtaining motor current data for each group. Ultimately, a linear relationship between the belt conveyor load and motor current can be fitted based on the material samples and motor current data. The more material sample groups there are, the more accurate the fitted linear relationship between the belt conveyor load and motor current.

[0030] In some embodiments, step S2 includes: Select different ambient temperatures; Test the load limit of the belt at different ambient temperatures; Establish a correlation between ambient temperature and belt load limit; According to the belt load limit, the first load range, the second load range and the third load range are set in order from small to large; Obtain the linear relationship between the belt conveyor load and motor current at different ambient temperatures; The first current interval, the second current interval, and the third current interval are set in a one-to-one correspondence according to the first load interval, the second load interval, and the third load interval.

[0031] In this embodiment, since the load limits of the belt vary at different ambient temperatures, a correlation is established between the ambient temperature and the belt load limit. Subsequently, the first load range, the second load range, and the third load range can be set according to the belt load limit at the actual ambient temperature.

[0032] Since there is a linear correlation between the motor current and the load of the belt conveyor, the first current range, the second current range, and the third current range can be set in a one-to-one correspondence with each other according to the first load range, the second load range, and the third load range, so that the settings of the first current range, the second current range, and the third current range match the ambient temperature.

[0033] Any implementation method is feasible as long as the load limit of the belt can be known. In some embodiments, the method of testing the load limit of the belt includes: Select two marking points on the belt; Set the limit distance between two marking points; And obtain the actual distance between two marking points when they are on the close edge in real time; Gradually increase the weight of the mineral sample carried by the conveyor belt until the actual spacing is equal to the limit spacing; The weight of the mineral sample at this time is the load limit of the belt.

[0034] It's understood that the belt's deformation reflects its load-bearing capacity. Excessive deformation indicates that the load exceeds the belt's load-bearing limit. When the actual distance between the two markings equals the limit distance, the belt's deformation has approached its ultimate elastic deformation. Further deformation could easily damage the belt. When the actual distance between the two markings equals the limit distance, the weight of the material being carried by the belt conveyor is its ultimate load capacity.

[0035] In some embodiments, the actual distance between two marking points when they are close to each other is obtained in real time by measuring with a laser rangefinder.

[0036] In this embodiment, a laser rangefinder is used to detect the distance between two marking points, so as to detect in real time the actual distance between the two marking points when they are close to each other.

[0037] In some embodiments, the two marking points are located on the edges of the belt.

[0038] In this embodiment, since the center of the belt is used to carry materials, in order to prevent the materials from covering the marking points, the marking points are set on the edges of the belt.

[0039] The present application also provides a belt anti-tear control system, which includes a support frame, a belt, a controller, a motor, a current sensor and a material introduction device. The belt is installed on the support frame, the motor is connected to the belt to drive the belt to rotate, the current sensor is used to detect the working current of the motor, and the material introduction device is used to introduce material into the belt. The controller is communicated with the current sensor, the motor and the material introduction device respectively, and the controller applies the above-mentioned belt anti-tear control method.

[0040] In order to better understand this application, Figure 1 The technical solution of this application is described in detail: Several groups of material samples of different weights are selected, and several groups of material samples are conveyed in sequence through a belt conveyor, so as to obtain the motor current data when conveying each group of material samples. Finally, the linear relationship between the load carried by the belt conveyor and the motor current can be fitted based on the material samples and the motor current data. Subsequently, the continuous first current interval, second current interval and third current interval are set in sequence. When the motor is in the first current interval, it indicates that the load carried by the belt conveyor is within a reasonable range, and the material introduction speed at the starting end of the belt conveyor can be maintained. When the motor is in the second current interval, it indicates that the load carried by the belt conveyor is large, and it is necessary to slow down the material introduction speed at the starting end of the belt conveyor and reduce the load carried by the belt conveyor. When the motor is in the third current interval, it indicates that the load carried by the belt conveyor is too large, and then stop introducing materials to the starting end of the belt conveyor, and quickly reduce the load carried by the belt conveyor. The belt anti-tearing control method provided by the present application can avoid the load carried by the belt conveyor being too large, and thus can effectively prevent the belt from tearing.

[0041] The specific implementation methods of the present application described above do not limit the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A belt tear prevention control method, characterized in that: include: S1. Obtain the linear relationship between the belt conveyor load and the motor current; S2, setting a first current interval, a second current interval, and a third current interval in order from small to large; S3. When the motor current is in the first current interval, the material introduction speed at the starting end of the belt conveyor is maintained and the belt conveyor continues to work; S4. When the motor current is in the second current interval, the material introduction speed at the starting end of the belt conveyor is slowed down, and the belt conveyor continues to work; S5. When the motor current is in the third current interval, the introduction of materials to the starting end of the belt conveyor is stopped, and the belt conveyor continues to work.

2. The belt tear prevention control method according to claim 1, characterized in that: The step S5 comprises: When the motor current is in the third current interval, the belt conveyor is controlled to continue working for a preset time; Within the preset time, if the motor current recovers to the first current interval, step S3 is executed; if the motor current recovers to the second current interval, step S4 is executed; if the motor current is still in the third current interval, stop introducing materials to the starting end of the belt conveyor and control the belt conveyor to stop.

3. The belt tear prevention control method according to claim 2, characterized in that: The preset time is 5 seconds.

4. The belt tear prevention control method according to claim 1, characterized in that: The control method further includes: When the motor current is lower than the minimum value of the first current interval, the material introduction speed at the starting end of the belt conveyor is increased.

5. The belt tear prevention control method according to claim 1, characterized in that: The step S1 comprises: Select several groups of material samples of different weights; Several groups of material samples are sequentially conveyed through a belt conveyor, and motor current data corresponding to the conveyed material samples are respectively obtained; The linear relationship between the belt conveyor load and the motor current at the same speed is fitted based on the material sample and motor current data.

6. The belt tear prevention control method according to claim 1, characterized in that: The step S2 comprises: Select different ambient temperatures; Test the load limit of the belt at different ambient temperatures; Establish a correlation between ambient temperature and belt load limit; According to the belt load limit, the first load range, the second load range and the third load range are set in order from small to large; Obtain the linear relationship between the belt conveyor load and motor current at different ambient temperatures; The first current interval, the second current interval, and the third current interval are set in a one-to-one correspondence according to the first load interval, the second load interval, and the third load interval.

7. The belt tear prevention control method according to claim 6, characterized in that: Methods for testing the load limit of belts include: Select two marking points on the belt; Set the limit distance between two marking points; And obtain the actual distance between two marking points when they are on the close edge in real time; Gradually increase the weight of the mineral sample carried by the conveyor belt until the actual spacing is equal to the limit spacing; The weight of the mineral sample at this time is the load limit of the belt.

8. The belt tear prevention control method according to claim 7, characterized in that: The actual distance between two marking points when they are close to each other is obtained in real time by measuring with a laser rangefinder.

9. The belt tear prevention control method according to claim 7, characterized in that: There are two marking points on the edge of the belt.

10. A belt anti-tear control system, characterized in that: It includes a support frame, a belt, a controller, a motor, a current sensor and a material introduction device. The belt is installed on the support frame. The motor is connected to the belt to drive the belt to rotate. The current sensor is used to detect the working current of the motor. The material introduction device is used to introduce material into the belt. The controller is communicated with the current sensor, the motor and the material introduction device respectively. The controller applies the belt anti-tear control method as described in any one of claims 1 to 9.

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