A device and method for automatically adjusting the running speed of a belt conveyor according to material flow

Abstract

The application provides a device and method for automatically adjusting the running speed of a belt conveyor according to material flow, and relates to the technical field of a belt conveyor transport device. The application realizes real-time acquisition of the material flow condition through a scanner to obtain an image, and controls the running speed of the material receiving belt conveyor through real-time flow information. The application can control the running speed according to the material flow, effectively controls the motor output power of the material receiving belt conveyor, and makes the material receiving belt conveyor reach the rated state for carrying, thereby improving the load rate of the material receiving belt conveyor. The application effectively realizes power reduction and energy saving under the condition of transporting the same total amount of material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of belt conveyor, in particular, especially to a device and method for automatically adjusting the running speed of belt conveyor according to the material flow. BACKGROUND

[0002] In the port industry, the belt conveyor is the key equipment for conveying bulk materials such as coal, grain and ore. In order to meet the rapid operation of the material, the port belt conveyor usually has the characteristics of wide belt conveyor width, high conveying capacity per unit time of the belt conveyor, high power of the belt conveyor driving motor, and large self-loss of the belt conveyor when it is in an empty state.

[0003] Since the self-loss of the belt conveyor changes little with the amount of transported material, when the amount of transported material is certain, within the rated conveying capacity of the belt conveyor, the more the amount of transported material per unit time of the belt conveyor, the higher the conveying efficiency of the belt conveyor, and the smaller the self-loss of the belt conveyor. However, due to the poor continuity of the material flow and the low material taking capacity of the port gantry crane and the stockyard reclaimer during the material taking operation, the material taking capacity is lower than the rated conveying capacity of the belt conveyor, which causes the belt conveyor to be unable to be fully loaded, thereby reducing the conveying efficiency of the belt conveyor. In addition, during the process of clearing the warehouse of the gantry crane, the material taking efficiency of the gantry crane is much lower than that during normal operation, but the running speed of the belt conveyor remains unchanged, which greatly reduces the conveying efficiency of the belt conveyor. The low conveying efficiency of the belt conveyor will waste a lot of energy.

[0004] Under the existing conditions, the speed of the belt conveyor of the entire conveying line is fixed and will not be adjusted during operation. When the hopper, ship unloader, stacker-reclaimer, reclaimer and other equipment feed the belt conveyor, the material flow is unstable and cannot reach the rated carrying capacity of the belt conveyor. When the material flow is small, the belt conveyor is almost in an empty state, so the load rate of the belt conveyor is low. The belt conveyor is driven by an asynchronous motor or a permanent magnet motor. The permanent magnet motor generally adopts constant torque control, that is, the output torque is fixed. The torque is certain, and the speed is proportional to the power. Therefore, the greater the speed, the more the power consumption. The output power of the motor includes the power of the transported material and the power of the self-loss of the equipment. Generally, the power of the self-loss of the belt conveyor equipment accounts for 30% to 50% of the output power of the motor. If the belt conveyor is operated in the previous manner, the amount of electricity consumed by the self-loss is large.

[0005] Therefore, a device capable of controlling the speed of the belt conveyor in real time according to the material flow conditions, so that the conveying capacity of the belt conveyor is always maintained at the maximum working condition, thereby improving the efficiency of the belt conveyor, has important significance for energy saving of the belt conveyor operation. SUMMARY

[0006] To address the aforementioned technical problem of low conveyor efficiency and energy waste due to the relatively small variation in wear and tear of the conveyor belt with the amount of transported material, this invention provides a device for automatically adjusting the conveyor belt speed based on material flow rate. This invention transmits motor operating current, motor torque, and conveyor belt material flow data to a smart conveyor speed controller in real time. The material type is manually input into the smart conveyor speed controller. The algorithm analyzes, filters, and processes the material flow rate, motor current, and motor torque data to control the conveyor belt speed in real time.

[0007] The technical means employed in this invention are as follows:

[0008] A device for automatically adjusting the running speed of a belt conveyor based on material flow rate includes: a scanner, a belt conveyor speed intelligent controller, and a direct torque controller;

[0009] The scanner is installed at the head of the feeding conveyor belt to acquire images of the material on the feeding conveyor belt in real time, and obtains the cross-sectional area information of the material on the feeding conveyor belt based on the material images; the controller receives the cross-sectional area information of the material on the feeding conveyor belt, approximates the cross-sectional area information of the material as instantaneous material flow rate information; and transmits the instantaneous material flow rate information to the intelligent speed controller of the conveyor belt to obtain the operating speed of the receiving conveyor belt. The receiving belt conveyor is delayed by the direct torque controller. After a certain time, at the stated operating speed Run;

[0010] The current signal information of the drive motor of the receiving conveyor belt is acquired synchronously, the real-time current of the receiving conveyor belt is compared with the rated current of the receiving conveyor belt, and the running speed of the receiving conveyor belt is controlled according to the comparison result.

[0011] Furthermore, the real-time current of the receiving conveyor belt drive motor is compared with the rated current of the receiving conveyor belt drive motor. If the rated current of the receiving conveyor belt drive motor is less than the real-time current, the receiving conveyor belt increases its operating speed at a calculated speed, with a cycle of 0.1 seconds per cycle, until the rated current of the receiving conveyor belt drive motor is greater than the real-time current. If the rated current is greater than or equal to the real-time current, the receiving conveyor belt operates at the calculated operating speed.

[0012] The operating speed of the receiving belt conveyor The calculation formula is:

[0013] ;

[0014] in, represents the running speed of the receiving belt conveyor; represents the running speed of the feeding belt conveyor; represents a continuous time period, ; represents the instantaneous material flow information of the receiving belt conveyor; represents the instantaneous material flow information of the feeding belt conveyor; represents a speed regulation coefficient, i.e. if the rated current of the receiving belt conveyor driving motor is greater than or equal to the real-time current of the receiving belt conveyor driving motor, if the rated current of the receiving belt conveyor driving motor is less than the real-time current of the receiving belt conveyor driving motor, the receiving belt conveyor is accelerated at a period of 5 seconds, the first period, if the rated current is still less than the real-time current after the first period ends, the second period is entered, and so on.

[0015] Further, the scanner is horizontally spaced apart from the head of the feeding belt conveyor by no less than 10 meters, and the scanner is arranged on a straight section between the head of the belt conveyor and the feeding point closest to the head of the belt conveyor, and the horizontal distance from the feeding point is greater than 1 meter.

[0016] Further, the scanner selects the belt surface of the belt conveyor as the reference surface, and the vertical distance between the scanner and the belt surface of the belt conveyor is 0.8-1.5 meters.

[0017] Further, to calculate the cross-sectional area information of the material of the feeding belt conveyor, i.e. the instantaneous material flow information of the feeding belt conveyor, a straight line where the projection of the scanning line emitted by the scanner on the horizontal ground surface is located is taken as the x axis, the intersection point of the projection of the outer contour line of one side of the feeding belt conveyor on the horizontal ground surface and the x axis is taken as the O point, a straight line perpendicular to the horizontal ground surface and intersecting the O point and the x axis is taken as the y axis, and the belt surface of the feeding belt conveyor in the static state is taken as the reference surface, so that the scanned reference surface is recorded as the function ;

[0018] When the material passes through, the outer contour of the material is acquired in real time by the scanner, the outer contour scanned by the scanner is a point cloud signal, the scanned outer contour is converted into the function , and the intersection point of the functions has the x coordinate values a and b respectively, and a<b; the function is differentiated with respect to the function The integral operation is performed to obtain the cross-sectional area of the material scanned on the feeding belt conveyor, and the cross-sectional area of the material on the feeding belt conveyor is equivalent to the instantaneous material flow information of the feeding belt conveyor, so that the instantaneous material flow information of the feeding belt conveyor is:

[0019] .

[0020] Further, since the receiving belt conveyor has a fixed rated carrying capacity, i.e., the maximum weight of the material that can be carried by the receiving belt conveyor is fixed, according to the maximum weight of the material that can be carried by the receiving belt conveyor, the maximum instantaneous material flow of the receiving belt conveyor is obtained, so that the material flow of the receiving belt conveyor is:

[0021] ;

[0022] ;

[0023] wherein, represents the rated carrying capacity of the receiving belt conveyor; represents the density of the material; represents the length of the receiving belt conveyor; represents the rated material flow.

[0024] Further, the receiving belt conveyor has a delay time is:

[0025] ;

[0026] wherein, represents the delay time of the adjusting speed of the receiving belt conveyor; represents the running speed of the feeding belt conveyor; represents the distance from the scanner to the material dropping point at the head of the feeding belt conveyor; represents the height from the head of the feeding belt conveyor to the material receiving point at the tail of the receiving belt conveyor; represents the acceleration of gravity.

[0027] The present application also comprises a method for automatically adjusting the running speed of the belt conveyor according to the material flow, comprising the following steps:

[0028] Step 1, setting the scanner at the head of the feeding belt conveyor, acquiring the material image of the feeding belt conveyor in real time, and obtaining the cross-sectional area information of the material of the feeding belt conveyor according to the material image of the feeding belt conveyor;

[0029] Step 2, the controller receives the cross-sectional area information of the material of the feeding belt machine, approximates the cross-sectional area information of the material to instantaneous flow information, and transmits the instantaneous flow information to the belt machine speed intelligent controller to obtain the running speed of the receiving belt machine ;

[0030] Step 3, the receiving belt machine is controlled by the direct torque controller to run at the running speed after a delay time .

[0031] Step 4, the driving motor current signal information of the receiving belt machine is synchronously obtained, and the real-time current of the receiving belt machine driving motor is compared with the rated current of the receiving belt machine driving motor; if the rated current of the receiving belt machine driving motor is less than the real-time current of the receiving belt machine driving motor, the running speed of the receiving belt machine is increased by 0.1 every cycle with 5 seconds as a cycle on the basis of the calculated running speed, until the rated current of the receiving belt machine driving motor is greater than the real-time current of the receiving belt machine driving motor; if the rated current is greater than or equal to the real-time current, the receiving belt machine runs at the calculated running speed.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] The device and method of the present application realize real-time acquisition of the material flow condition through the image acquired by the scanner, and realize control of the running speed of the receiving belt machine through the real-time flow information, can control the running speed according to the material flow, effectively control the motor output power of the receiving belt machine, make the receiving belt machine reach the rated state for carrying, and improve the load rate of the receiving belt machine. Effectively realize power reduction and energy saving in the case of transporting the same total amount of material. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Fig. 1 It is a flowchart of the present application.

[0036] Fig. 2 It is a schematic diagram of the installation of the belt machine cross-sectional belt machine flow detection equipment.

[0037] ​In the figure: 1, scanner; 2, belt surface of the belt conveyor; 3, material; 4, rain cover of the belt conveyor. DETAILED DESCRIPTION

[0038] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0039] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] As shown in Figs. 1-2 The present application provides a device for automatically adjusting the running speed of a belt conveyor according to the material flow, which comprises a scanner 1, a belt conveyor speed intelligent controller and a direct torque controller. Since the belt conveyor fed by a hopper, a ship unloader, a stacker-reclaimer and a reclaimer is called a feeding belt conveyor, the feeding characteristics of these feeding devices are poor material flow continuity, and the feeding amount generally does not reach the rated conveying capacity of the feeding belt conveyor.

[0041] The belt conveyor fed by the feeding belt conveyor is called a receiving belt conveyor, and the belt conveyor fed by the receiving belt conveyor and the belt conveyor behind it is called a conveying belt conveyor. In the present application, the belt conveyor driving motor is a permanent magnet motor (including a permanent magnet integrated machine and a permanent magnet roller), and the driving motor of the feeding belt conveyor can be an asynchronous motor. The speed of the feeding belt conveyor is constant and does not need to be adjusted. In the present application, the belt conveyor speed controller is arranged in the control room of the belt conveyor power distribution room to control the feeding belt conveyor and the receiving belt conveyor respectively. The direct torque controller is arranged in the low-voltage power distribution cabinet for supplying power to the belt conveyor driving motor. The power distribution cabinet can be arranged in the power distribution room or beside the belt conveyor driving motor. Such arrangement is a common arrangement in the art, so it will not be described here.

[0042] In the present application, the scanner is arranged at the head of the feeding belt conveyor, real-time material image of the feeding belt conveyor is acquired, and cross-sectional area information of the material of the feeding belt conveyor is acquired according to the material image of the feeding belt conveyor. In the present application, as a preferred embodiment, the horizontal distance between the scanner and the head of the feeding belt conveyor is not less than 10 meters, and the scanner is arranged on the straight section between the head of the belt conveyor and the nearest feeding point of the belt conveyor, and the horizontal distance between the scanner and the feeding point is greater than 1 meter. The scanner selects the belt surface 2 of the belt conveyor as the reference surface, and the vertical distance between the scanner and the belt surface of the belt conveyor is 0.8-1.5 meters.

[0043] In the present application, the scanner is selected as a laser radar scanner. It needs to be specially pointed out that if it is placed in the rain cover 4 of the belt conveyor, the explosion-proof requirement is required, and the scanner 1 adopts explosion-proof equipment or isolation such as explosion-proof glass. If it is placed outside the rain cover 4 of the belt conveyor, there is no explosion-proof requirement, and the scanner 1 adopts dustproof equipment or isolation such as glass with certain hardness.

[0044] Further, the belt conveyor speed intelligent controller receives the cross-sectional area information of the material of the feeding belt conveyor, and approximates the cross-sectional area information of the material to instantaneous flow information. The instantaneous flow information is transmitted to the belt conveyor speed intelligent controller, the running speed of the receiving belt conveyor is acquired , the receiving belt conveyor runs according to the running speed after a delay time controlled by the direct torque controller , the running speed of the receiving belt conveyor is acquired , the driving motor current signal information of the receiving belt conveyor is acquired synchronously, the real-time current of the driving motor of the receiving belt conveyor is compared with the rated current of the driving motor of the receiving belt conveyor, and the running speed of the receiving belt conveyor is controlled according to the comparison result.

[0045] As a preferred embodiment, in the present application, the real-time current of the driving motor of the receiving belt conveyor is compared with the rated current of the driving motor of the receiving belt conveyor, if the rated current of the driving motor of the receiving belt conveyor is less than the real-time current of the driving motor of the receiving belt conveyor, the running speed of the receiving belt conveyor is increased by 0.1 every cycle, and the receiving belt conveyor runs at the calculated running speed, until the rated current of the driving motor of the receiving belt conveyor is greater than the real-time current of the driving motor of the receiving belt conveyor; if the rated current is greater than or equal to the real-time current, the receiving belt conveyor runs at the calculated running speed.

[0046] Preferably, the calculation formula of the running speed of the receiving belt conveyor is as follows:

[0047] ​​

[0048] wherein, represents the running speed of the receiving belt conveyor; represents the running speed of the feeding belt conveyor; represents a continuous time period, ; represents the instantaneous flow information of the receiving belt conveyor; represents the instantaneous flow information of the feeding belt conveyor; represents the speed regulation coefficient, i.e. if the rated current of the receiving belt conveyor driving motor is greater than or equal to the real-time current of the receiving belt conveyor driving motor, if the rated current of the receiving belt conveyor driving motor is less than the real-time current of the receiving belt conveyor driving motor, the receiving belt conveyor is accelerated at a period of 5 seconds, the first period, if the rated current is still less than the real-time current after the first period ends, the second period is entered, and so on.

[0049] Meanwhile, in order to calculate the cross-sectional area information of the material of the feeding belt conveyor, i.e. the instantaneous flow information of the material of the feeding belt conveyor, a straight line where the projection of the scanning line emitted by the scanner on the horizontal ground is located is taken as the x axis, the intersection point of the projection of the outer contour line of one side of the feeding belt conveyor on the horizontal ground and the x axis is taken as the O point, a straight line which is perpendicular to the horizontal ground and intersects the O point and the x axis is taken as the y axis, and the belt surface of the feeding belt conveyor in the static state is taken as the reference surface, then the scanned reference surface is recorded as the function ;

[0050] When the material passes through, the outer contour of the material 3 is acquired in real time by the scanner, the outer contour scanned by the scanner is a point cloud signal, the scanned outer contour is converted into the function , and the x coordinate values of the intersection point of the function are a and b respectively, and a < b; the function and the function are subjected to integral operation, the cross-sectional area of the material on the feeding belt conveyor is obtained, the cross-sectional area of the material on the feeding belt conveyor is equivalent to the instantaneous flow information of the feeding belt conveyor, and the instantaneous flow information of the feeding belt conveyor is:

[0051] .

[0052] Further, the existing feeding belt machine generally cannot reach the maximum material flow when running. The material flow of the receiving belt machine can reach the maximum by reducing the running speed of the receiving belt machine to achieve the purpose of energy saving. Since the rated carrying capacity of the receiving belt machine is fixed, i.e. the maximum weight of the material that can be carried by the receiving belt machine is fixed, according to the maximum weight of the material that can be carried by the receiving belt machine, the maximum instantaneous material flow of the receiving belt machine can be obtained The material flow of the receiving belt machine is:

[0053] ;

[0054] ;

[0055] wherein, represents the rated carrying capacity of the receiving belt machine; represents the density of the material; represents the length of the receiving belt machine; represents the rated material flow.

[0056] The feeding belt machine runs at the rated speed v (v≤3.5m / s), the running speed of the receiving belt machine is calculated, and then the running speed of the receiving belt machine is adjusted through the actuator to control the running speed of the receiving belt machine, so that the receiving belt machine runs at the calculated running speed. The running speed of the receiving belt machine calculated by the control model should be not greater than the rated running speed of the receiving belt machine. If the running speed of the receiving belt machine calculated by the control model is greater than the rated speed of the receiving belt machine, the data is invalid, and the receiving belt machine runs at the speed calculated in the last calculation period.

[0057] The feeding belt machine needs to be delayed in speed. The head of the feeding belt machine is higher than the receiving point of the receiving belt machine, and it takes a period of time T1 for the material to be transported from the position of the scanner of the feeding belt machine to the receiving point of the receiving belt machine. The speed of the receiving belt machine is adjusted after the real-time material flow is scanned by the scanner, and then delayed for a period of time T1 to ensure that the receiving belt machine runs at the calculated running speed. The delay time of the receiving belt machine is:

[0058] ;

[0059] wherein, represents the delay time of the adjusted speed of the receiving belt machine; represents the running speed of the feeding belt machine; represents the distance from the scanner to the material falling point at the head of the feeding belt machine; represents the height from the head of the feeding belt machine to the receiving point at the tail of the receiving belt machine; represents the acceleration of gravity. ​

[0060] The operating speed of the receiving conveyor belt can be controlled by controlling the speed of its drive motor. The feeding conveyor belt is driven by a permanent magnet motor or an asynchronous motor, while the receiving conveyor belt is driven by a permanent magnet motor. The operating speed of the receiving conveyor belt is directly proportional to the speed of its drive motor, so controlling the operating speed of the receiving conveyor belt is equivalent to controlling the speed of its drive motor.

[0061] ;

[0062] in, Indicates the operating speed of the receiving conveyor belt; Indicates the diameter of the drive roller of the receiving conveyor belt; This indicates the rotational speed of the drive motor of the receiving conveyor belt.

[0063] The present invention also includes a method for automatically adjusting the operating speed of a belt conveyor based on the material flow rate, comprising the following steps:

[0064] Step 1: Set the scanner at the head of the feeding belt conveyor to acquire images of the material on the feeding belt conveyor in real time, and obtain the cross-sectional area information of the material on the feeding belt conveyor based on the images of the material on the feeding belt conveyor.

[0065] Step 2: The controller receives the cross-sectional area information of the material from the feeding belt conveyor, approximates the cross-sectional area information of the material as the instantaneous material flow rate information, and transmits the instantaneous material flow rate information to the belt conveyor speed intelligent controller to obtain the operating speed of the receiving belt conveyor. ;

[0066] Step 3: Control the delay of the receiving belt conveyor through the direct torque controller. After a certain time, at the stated operating speed Run;

[0067] Step 4: Synchronously acquire the current signal information of the drive motor of the receiving conveyor belt, and compare the real-time current of the drive motor with its rated current. If the rated current of the drive motor is less than the real-time current, the operating speed of the receiving conveyor belt will increase by 0.1 units per 5-second cycle, based on the calculated operating speed. The receiving conveyor belt will operate at the calculated speed until the rated current of the receiving conveyor belt drive motor is greater than the real-time current of the receiving conveyor belt drive motor. If the rated current is greater than or equal to the real-time current, the receiving conveyor belt will operate at the calculated speed.

[0068] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments. In the several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other means.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for automatically adjusting the running speed of a belt conveyor in accordance with the flow of material, characterized in that, The application relates to a belt conveyor speed intelligent controller and a direct torque controller. If the rated current is greater than or equal to the real-time current, the receiving belt conveyor runs at the calculated running speed. The scanner is arranged at the head of the feeding belt conveyor, and real-time material images of the feeding belt conveyor are acquired, and cross-sectional area information of the material of the feeding belt conveyor is acquired according to the material images of the feeding belt conveyor; the belt conveyor speed intelligent controller receives the cross-sectional area information of the material of the feeding belt conveyor, and approximates the cross-sectional area information of the material to instantaneous flow information; the instantaneous flow information is transmitted to the belt conveyor speed intelligent controller, and the running speed of the receiving belt conveyor is acquired , the receiving belt conveyor is controlled by the direct torque controller to run at the running speed after a delay time ; the driving motor current signal information of the receiving belt conveyor is synchronously acquired, the real-time current of the driving motor of the receiving belt conveyor is compared with the rated current of the driving motor of the receiving belt conveyor, and the running speed of the receiving belt conveyor is controlled according to the comparison result; The real-time current of the drive motor of the receiving belt conveyor is compared with the rated current of the drive motor of the receiving belt conveyor, if the rated current of the drive motor of the receiving belt conveyor is less than the real-time current of the drive motor of the receiving belt conveyor, the running speed of the receiving belt conveyor is increased by 0.1 per cycle with 5 seconds as a cycle based on the calculated running speed, until the rated current of the drive motor of the receiving belt conveyor is greater than the real-time current of the drive motor of the receiving belt conveyor . The horizontal distance between the scanner and the head of the feeding belt conveyor is not less than 10 meters, and the scanner is arranged on a straight section between the head of the feeding belt conveyor and a feeding point closest to the head of the feeding belt conveyor, and the horizontal distance between the scanner and the feeding point is greater than 1 meter.

2. The device for automatically adjusting the running speed of the belt conveyor according to the material flow according to claim 1, characterized in that, The application further discloses a belt conveyor speed intelligent control method.

3. The device for automatically adjusting the running speed of the belt conveyor according to the material flow according to claim 1, characterized in that, The scanner selects the belt surface of the feeding belt conveyor as the reference surface and the vertical distance between the scanner and the belt surface of the feeding belt conveyor is 0.8 ~1.5 .

4. The device for automatically adjusting the running speed of the belt conveyor according to the material flow according to claim 1, characterized in that, The receiving belt conveyor delay Is: ； wherein, represents the delay time for the receiving belt adjustment speed; represents the feeding belt running speed; represents the distance from the scanner to the feeding belt head drop point; represents the height from the feeding belt head to the receiving belt tail drop point; represents the gravity acceleration.

5. A method for automatically adjusting the running speed of a belt conveyor according to the material flow, using the device according to any one of claims 1 to 4, characterized in that Step 1: the scanner is arranged at the head of the feeding belt conveyor, real-time feeding belt conveyor material images are acquired, and cross-sectional area information of the feeding belt conveyor material is acquired according to the feeding belt conveyor material images; Step 4: the driving motor current signal information of the receiving belt conveyor is synchronously acquired, and the real-time current of the driving motor of the receiving belt conveyor is compared with the rated current of the driving motor of the receiving belt conveyor. Step 2, the controller receives the cross-sectional area information of the material of the feeding belt conveyor, approximates the cross-sectional area information of the material to instantaneous flow information, and transmits the instantaneous flow information to the intelligent speed controller of the belt conveyor to obtain the running speed of the receiving belt conveyor ; Step 3, controlling the belt conveyor by the direct torque controller after a certain time according to the running speed running; ​ If the rated current of the receiving belt conveyor driving motor is less than the real-time current of the receiving belt conveyor driving motor, the running speed of the receiving belt conveyor is increased by 0.1 per cycle of 5 seconds on the basis of the calculated running speed, until the rated current of the receiving belt conveyor driving motor is greater than the real-time current of the receiving belt conveyor driving motor; if the rated current is greater than or equal to the real-time current, the receiving belt conveyor runs at the calculated running speed. , until the rated current of the receiving belt conveyor driving motor is greater than the real-time current of the receiving belt conveyor driving motor; if the rated current is greater than or equal to the real-time current, the receiving belt conveyor runs at the calculated running speed.

Images