A belt conveyor and a deviation correcting device and method for a conveyor belt thereof

Abstract

The application aims to provide a belt conveyor and a deviation correcting device and method thereof, which can correct the deviation of the belt conveyor when the belt conveyor deviates, so as to guarantee the work efficiency and improve the work safety. The deviation correcting device is characterized in that the belt conveyor is tensioned on a plurality of tension rollers, and the deviation correcting device comprises: a deviation detecting component, which is used for detecting whether the belt conveyor deviates; a tension detecting component, which is used for detecting the tension of the belt conveyor; a friction coefficient detecting component, which is used for detecting the friction coefficient of the belt conveyor; a first support, at least one tension roller is provided with the first support, and the tension roller and the first support are rotationally connected; and a driving component, which is used for driving the tension roller to rotate a set angle along a set direction relative to the first support when the deviation detecting component detects that the belt conveyor deviates, and the set direction and the set angle are determined according to the detected tension and the friction force determined by the detected friction coefficient.

Description

Technical Field

[0001] This application relates to the field of belt conveyor technology, specifically to a belt conveyor and its belt alignment device and alignment method. Background Technology

[0002] Belt conveyors have advantages such as large conveying capacity, long conveying distance, low operating and maintenance costs, simple structure, safe and reliable use, and convenient maintenance. They are widely used in conveying lines in ports, mines, and steel plant material yards.

[0003] For belt conveyors that transport bulk materials for extended periods, the irregular and scattered materials cause the conveyor belt to be in a state of uneven stress during operation. In addition, belt conveyors often operate in extreme weather conditions such as high altitude, large temperature differences, or high humidity, which can cause the conveyor belt to tend to deviate to one end at the rollers. This is generally referred to as conveyor belt misalignment in the industry.

[0004] If the conveyor belt of a belt conveyor deviates too much, it will trigger the belt conveyor to stop due to deviation and cause material spillage, resulting in reduced work efficiency. In severe cases, it may even cause the conveyor belt to break, causing the material on the conveyor belt to flow backward, damaging the main equipment of the belt conveyor, and threatening the personal safety of the on-site work personnel. Summary of the Invention

[0005] The purpose of this application is to provide a belt conveyor and a belt deviation correction device and method, which can correct the belt deviation when it runs off-track, so as to ensure work efficiency and improve work safety.

[0006] To solve the above-mentioned technical problems, this application provides a belt correction device for a belt conveyor, wherein the conveyor belt is tensioned by a plurality of tensioning rollers, and the correction device includes:

[0007] An offset detection component is used to detect whether the conveyor belt has shifted.

[0008] A tension detection component, wherein the tension detection component is used to detect the tension of the conveyor belt;

[0009] A friction coefficient detection component is used to detect the friction coefficient of the conveyor belt;

[0010] A first support, at least one of the tensioning rollers is provided with the first support, and the tensioning roller and the first support are rotatably connected;

[0011] The drive component, when the offset detection component detects that the conveyor belt has deviated, drives the tension roller to rotate relative to the first support in a set direction by a set angle. The set direction and the set angle are determined based on the detected tension and the friction force determined by the detected coefficient of friction.

[0012] In one embodiment, a second support is also included, at least one of the tensioning rollers is equipped with the second support, and the friction coefficient detection component includes a cantilever and a contact, one end of the cantilever is connected to the second support, and the other end is provided with the contact, the contact being used to contact the conveyor belt.

[0013] In one embodiment, the material of the contact is the same as the material of the conveyor belt.

[0014] In one embodiment, the driving component includes a driving cylinder, the tensioning roller is mounted on a roller shaft having a first end and a second end, the first bracket and the second end being rotatably connected, and the piston rod of the driving cylinder being connected to the first end of the roller shaft to drive the roller shaft to rotate the tensioning roller relative to the first bracket.

[0015] In one embodiment, the offset detection component includes a distance sensor for measuring the distance to the side edge of the conveyor belt and determining whether the conveyor belt has shifted based on changes in the distance.

[0016] This application also provides a method for correcting the belt alignment of a belt conveyor, employing the belt alignment device described in any of the above claims, wherein the method includes:

[0017] Step 1: Determine whether the conveyor belt has shifted and the direction of the shift based on the signal detected by the offset detection component;

[0018] Step 2: If a deviation occurs, assume that the tensioning roller rotates relative to its current position in either a first direction or a second direction, where the first direction and the second direction are opposite. Based on the signals detected by the tension detection component and the friction coefficient detection component, obtain the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller, and then obtain the resultant force on the conveyor belt after the tensioning roller rotates. When the resultant force is opposite to the direction of the conveyor belt deviation, determine that the rotation angle and rotation direction of the tensioning roller relative to its current position under the assumed condition are a set angle and a set direction.

[0019] Step 3: Control the drive unit to drive the tensioning roller to rotate at a set angle in the set direction until the conveyor belt returns to the correct position.

[0020] In one embodiment, in step two, the set angle of rotation of the tensioning roller is determined by the following steps:

[0021] Step S1: Assuming the tensioning roller rotates a first predetermined angle in the first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component, the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller are obtained, and then the resultant force on the conveyor belt at this time is obtained.

[0022] Step S2: If the direction of the resultant force is opposite to the direction of the conveyor belt offset, proceed to step S3; if the direction of the resultant force is the same as the direction of the conveyor belt offset, proceed to step S4.

[0023] Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction;

[0024] Step S4: Assuming the tensioning roller rotates a second predetermined angle in the second direction, obtain the resultant force on the conveyor belt at this time;

[0025] Step S5: If the direction of the resultant force is opposite to the direction of the conveyor belt offset, proceed to step S6; if the direction of the resultant force is the same as the direction of the conveyor belt offset, proceed to step S7.

[0026] Step S6: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction;

[0027] Step S7: Repeat step S1, and each time it is repeated, increase the values ​​of the first predetermined angle and the second predetermined angle.

[0028] In one embodiment, in step two, the set angle of rotation of the tensioning roller is determined by the following steps:

[0029] Step S1: Assuming the tensioning roller rotates a first predetermined angle in a first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component, the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller are obtained, and then the first resultant force on the conveyor belt at this time is obtained; and assuming the tensioning roller rotates a second predetermined angle in a second direction, the second direction being opposite to the first direction, the second resultant force on the conveyor belt at this time is obtained.

[0030] Step S2: If the direction of the first resultant force is opposite to the direction of the conveyor belt offset, proceed to step S2. If the direction of the second resultant force is opposite to the direction of the conveyor belt offset, proceed to step S3. If both the direction of the first resultant force and the direction of the second resultant force are the same as the direction of the conveyor belt offset, repeat step S1. Each time it is repeated, the values ​​of the first predetermined angle and the second predetermined angle are increased.

[0031] Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction;

[0032] Step S4: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction.

[0033] In one embodiment, the first predetermined angle and the second predetermined angle are equal.

[0034] In one approach, in step two, the first predetermined angle and the second predetermined angle increase by the same amount each time, and the first predetermined angle and the second predetermined angle do not exceed a set angle range.

[0035] In one approach, a predetermined range of conveyor belt offset is set. If the offset detected by the offset detection component is within the predetermined range, it is determined that the conveyor belt has not shifted; otherwise, it is determined that an offset has occurred.

[0036] This application also provides a belt conveyor, including a conveyor belt, and a belt alignment device for the belt conveyor described in any of the above claims.

[0037] The belt conveyor and its belt correction device and method provided in this application can obtain tension by detecting tension through a tension detection component and obtain the friction coefficient between the conveyor belt and the tensioning roller by detecting friction coefficient detection component, thereby obtaining friction force. It can be assumed that the tensioning roller rotates at a certain angle, and the resultant force on the conveyor belt in the offset direction after rotation can be calculated based on friction force and tension. The resultant force in the same offset direction can be obtained by one or more calculations. Under the corresponding assumed conditions, the rotation angle and rotation direction of the tensioning roller can be determined as a set angle and a set direction. The drive component can be controlled to rotate according to the set angle and set direction to achieve the purpose of correction.

[0038] Therefore, the belt correction device and method for belt conveyors in this application fully consider the unstable friction force on the conveyor belt. The friction force is affected by temperature, humidity, altitude and load, and is a dynamically changing physical quantity. The belt correction method of this application can realize real-time detection and dynamic correction, thereby better achieving the purpose of belt correction, so as to ensure work efficiency and improve work safety. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the belt conveyor equipped with a belt correction device in an embodiment of this application;

[0040] Figure 2 for Figure 1 A schematic diagram of the position of one of the tensioning rollers;

[0041] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0042] Figure 4 A schematic diagram illustrating the principle of causing the conveyor belt to shift.

[0043] Figure 5 for Figure 1 A schematic diagram of the structure in which the friction coefficient detection component is mounted on the second bracket;

[0044] Figure 6 This is a force analysis diagram of the tensioning roller when it rotates clockwise;

[0045] Figure 7 This is a force analysis diagram of the tensioning roller when it rotates counterclockwise;

[0046] Figure 8 This is a force analysis diagram of the tensioning roller when tensioning the conveyor belt;

[0047] Figure 9 This is a flowchart of the belt correction method for the belt conveyor in the embodiments of this application.

[0048] The annotations in the figure are explained as follows:

[0049] 100 - Conveyor belt;

[0050] 200-Tension Roller;

[0051] 300-Support roller;

[0052] 400 - Second support;

[0053] 501-First support; 502-Third support; 503-Drive component; 504-Friction coefficient detection component; 505-Controller; 506-Offset detection component; 507-Ball joint; 508-Connecting support;

[0054] 600-Drum shaft. Detailed Implementation

[0055] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0057] Please refer to Figure 1 As shown, Figure 1 This is a schematic diagram of the belt conveyor equipped with a belt correction device 100 in an embodiment of this application.

[0058] The belt conveyor in this embodiment includes a conveyor belt 100 and tension rollers 200, wherein the conveyor belt 100 is tensioned by a plurality of tension rollers 200. Figure 1 The conveyor belt 100 is a reversible belt. The belt conveyor specifically includes two horizontal tension rollers 200 and two vertical tension rollers 200. After the conveyor belt 100 passes through one horizontal tension roller 200, one vertical tension roller 200, another vertical tension roller 200, and another horizontal tension roller 200 in sequence, the conveyor belt 100 changes from conveying in one side to conveying in the opposite side.

[0059] Can continue to combine Figure 2 , 3 4. Understanding Figure 2 for Figure 1 A schematic diagram of a tensioning roller at position 200. Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 A schematic diagram illustrating the principle of causing the conveyor belt 100 to deflect.

[0060] The belt conveyor in this embodiment also includes a belt correction device for the conveyor belt 100. The belt correction device includes an offset detection component 506, a tension detection component, a friction coefficient detection component 504, a first support 501, and a drive component 503. The structure of each part will be described in detail below.

[0061] The offset detection component 506 is used to detect whether the conveyor belt 100 has shifted. Under normal conditions, when the conveyor belt 100 is not shifted, it is in a first position relative to the tension roller 200. In this first position, the centerline of the conveyor belt 100 in the width direction usually coincides with the centerline of the tension roller 200 in the length direction. When the conveyor belt 100 shifts, it is in a second position, which is offset from the first position in the length direction of the tension roller 200. For example... Figure 4As shown, when the tensioning roller 200 is arranged in the vertical direction, the length direction of the tensioning roller 200 is vertical. The conveyor belt 100 may be shifted upward. At this time, the second position is vertically offset from the first position and located above the first position. When the conveyor belt 100 is also shifted downward, the second position is vertically offset from the first position and located below the first position.

[0062] In this embodiment, at least one tensioning roller 200 is selected, and a corresponding offset detection component 506 is installed. The offset detection component 506 can be a distance sensor, specifically an ultrasonic distance sensor, or other types of distance sensors. The distance sensor is, for example, located outside the end of the corresponding tensioning roller 200, and has a certain distance from the tensioning roller 200 in the length direction. The distance sensor can detect the distance between itself and the conveyor belt 100 tensioned on the tensioning roller 200, that is, it is used to detect the distance between the edge of the conveyor belt 100 and the distance sensor. Figure 4 As shown, when the conveyor belt 100 is not offset, the distance sensor can detect the distance between it and the conveyor belt 100 as L. If the conveyor belt 100 offsets, the detected distance is L', and the offset amount is L-L'. If L-L' is positive, it indicates that the distance has decreased, and the conveyor belt 100 is offset upwards. If L-L' is negative, it indicates that the conveyor belt 100 is offset downwards. Thus, the offset amount and direction of the conveyor belt 100 can be detected. The determination of the offset direction varies depending on the location of the offset detection component 506. For example... Figure 4 If the offset detection component 506 is located below the conveyor belt 100, a decrease in the detection spacing indicates an upward shift, and vice versa, a downward shift.

[0063] The tension detection component of the belt alignment device is used to detect the tension of the conveyor belt 100, and the tension detection component may include a pressure sensor. For example... Figure 1 As shown, the vertical tensioning roller 200 is mounted on the first bracket 501 via the roller shaft 600. At this time, a pressure sensor, which is a tension detection component, can be set on the first bracket 501. The conveyor belt 100, which is tensioned to the vertical roller, is subjected to tension in the horizontal direction.

[0064] The friction coefficient detection component 504 of the belt alignment device is used to detect the friction coefficient of the conveyor belt 100. (See reference...) Figure 5 understand, Figure 5 for Figure 1 A schematic diagram of the structure of the friction coefficient detection component 504 mounted on the second bracket 400.

[0065] like Figure 1As shown, in addition to the tensioning roller 200, the belt conveyor also includes a support roller 300. The support roller 300 is positioned between the vertical and horizontal tensioning rollers 200. The conveyor belt 100 between the vertical and horizontal tensioning rollers 200 has a rotating shape. The support roller 300 is inclined relative to the vertical direction, which helps to support the twisting conveyor belt 100 and stabilize it. The support roller 300 does not tension the conveyor belt 100, resulting in fewer contact points between the conveyor belt 100 and the roller. Friction coefficient detection components 504 can be easily arranged near the contact points between the conveyor belt 100 and the roller.

[0066] Let's look again. Figure 5 The friction coefficient detection component 504 includes a cantilever and a contact. The cantilever has a first end and a second end. The support roller 300 is mounted on a second bracket 400. Figure 5 Specifically, the structure is a square frame. One end of the roller shaft 600 supporting the roller 300 is supported at a corner above the second support 400, and the other end is supported at a corner below the second support 400. At this time, the first end of the cantilever of the supporting roller 300 is fixed to the side of the second support 400, and a contact is located at the second end of the cantilever. The contact is used to contact the conveyor belt 100 to detect and obtain frictional force. Specifically, tension and pressure sensors are installed at the contact. After the belt conveyor starts working, the tension and pressure sensors provide real-time pressure and tension parameters, and the real-time friction coefficient is calculated backward from the sliding friction formula. The sliding friction formula is:

[0067] f = μN

[0068] Where f is the sliding friction force, μ is the coefficient of friction, and N is the pressure.

[0069] Figure 5 In this design, the friction coefficient detection component 504 includes a cantilever, which facilitates contact between the contact point and the surface of the conveyor belt 100 without interfering with its operation. It is understood that the friction coefficient detection component 504 is not limited to this configuration; it can also be directly positioned at the tension roller 200 to detect the friction coefficient of the conveyor belt 100. However, as mentioned above, positioning it at the support roller 300 simplifies the arrangement and facilitates the implementation of the detection. The contact point can be made of the same material as the conveyor belt 100, which can reduce or avoid the impact on the conveyor belt 100 during contact.

[0070] The correction device in this embodiment includes a first bracket 501, at least one tensioning roller 200 is mounted on the first bracket 501, and the tensioning roller 200 and the corresponding first bracket 501 are rotatably connected, that is, the tensioning roller 200 can swing relative to the first bracket 501. For example, as... Figure 3 As shown, the tensioning roller 200 and the first support 501 are connected by a ball joint 507. The ball joint 507 has a higher degree of rotational freedom and is easier to drive the tensioning roller 200 to rotate according to adjustment requirements. However, the tensioning roller 200 and the first support 501 can also be connected by a hinge shaft.

[0071] The belt alignment device also includes a drive component 503. When the offset detection component 506 detects an offset in the conveyor belt 100, it can drive the tension roller 200 to rotate relative to the first support 501 by a set angle. The set angle can be determined based on the detected tension and the friction force determined by the detected coefficient of friction. How to determine the set angle will be discussed in detail later. Figure 2 The drive component 503 specifically includes a drive cylinder, and the correction device also includes a third bracket 502. The roller shaft 600 of the tension roller 200 includes a first end and a second end. The first end of the roller shaft 600 is connected to the first bracket 501, and the second end is connected to the third bracket 502. The piston rod of the drive cylinder is connected to the third bracket 502, and a connecting support 508 is provided on the third bracket 502. The piston rod is specifically connected to the connecting support 508. The cylinder body of the drive cylinder is connected to a mounting base (not shown in the figure). The mounting base remains relatively stationary with respect to the first bracket 501. The mounting base can be part of the base frame of the belt conveyor, or it can be a separately set structure. When the piston rod of the drive cylinder extends, it can drive the tension roller 200 to rotate relative to the first bracket 501. The drive cylinder can be, for example, a hydraulic cylinder or a pneumatic cylinder. The drive component 503 can also be other drive structures besides the drive cylinder, such as a battery and a gear rack. In addition, the drive component 503 can also be directly connected to the roller shaft 600 of the tension roller 200. The third bracket 502 is set here to facilitate the setting of the offset detection component 506 and also to connect with the drive component 503. The structure is compact and the installation is reliable.

[0072] In this embodiment, at least one tensioning roller 200 is configured to be rotatable. When a relative offset is detected on the conveyor belt 100 on the tensioning roller 200, the tensioning roller 200 can be driven to rotate by the driving component 503. Then, the tension of the conveyor belt 100 and the frictional force it experiences can generate a resultant force opposite to the offset direction, thereby assisting the conveyor belt 100 to move in the opposite direction of the offset, so as to achieve the purpose of correcting the offset.

[0073] However, it should be understood that the friction and tension of the conveyor belt 100 are affected by factors such as the working environment of the belt conveyor. During actual operation, the friction and tension will change accordingly. Therefore, to correct the offset, the set angle and direction of rotation of the tension roller 200 can be calculated based on the actual situation. For example... Figure 1 As shown, the correction device may include a controller 505, which is connected to a tension detection component and a friction coefficient detection component 504 to obtain the detected tension and friction coefficient.

[0074] You can refer to Figure 6 , Figure 6 This is a force analysis diagram of the tensioning roller 200 rotating clockwise.

[0075] The tension F of the tensioning roller 200 is obtained by the tension detection component, and the coefficient of friction μ is obtained by the coefficient of friction detection component 504. Figure 6 As shown, if the tensioning roller 200 rotates clockwise by an angle θ, the tension F can obtain a component force F' = Fsinθ along the length of the tensioning roller 200.

[0076] Next, calculate the vertical component of F', F1, where F1 = F'cosθ = Fsinθcosθ.

[0077] At this moment, the frictional force on the conveyor belt 100 is f = μN.

[0078] Combination Figure 8 understand, Figure 8 The diagram shows the force analysis of the conveyor belt 100 when the tension roller 200 tensions the conveyor belt 100. It illustrates the wrap angle ω of the conveyor belt 100 with respect to the tension roller 200, where ω is a known value. The pressure N can be calculated from the tension F through the following derivation process. Assume the force vector of the conveyor belt 100 located on one side of the tension roller 200. Force vector of the conveyor belt 100 on the other side Then we can get:

[0079]

[0080]

[0081]

[0082]

[0083] The normal force N between the conveyor belt 100 and the tension roller 200 can be calculated using the above formula, and then the frictional force f can be calculated.

[0084]

[0085] Then we can obtain the vertical component of the frictional force f, f1 = fcosθ:

[0086]

[0087] Given the frictional force f, we can establish a functional relationship between the rotation angle θ and the resultant force F2:

[0088]

[0089] It can be seen that for the vertically arranged tension roller 200, the weight of the conveyor belt 100, G=mg, will also affect the upward or downward movement of the conveyor belt 100. Therefore, the resultant force can also take gravity into account to further ensure that the calculation of the resultant force F is more accurate.

[0090]

[0091] like Figure 6 As shown, the conveyor belt 100 is offset downwards at this time. If the calculated resultant force F2 is greater than 0, then the direction of the resultant force F2 is opposite to the direction of offset, which can help the conveyor belt 100 move upwards to correct the offset. If the calculated resultant force F2 is less than 0, it means that the direction of the resultant force F2 is the same as the direction of offset, which will exacerbate the downward movement of the conveyor belt 100. In this case, the direction of rotation of the conveyor belt 100 can be changed, and a counterclockwise rotation calculation can be performed.

[0092] Please continue to refer to this. Figure 7 understand, Figure 7 This is a force analysis diagram of the tensioning roller 200 rotating counterclockwise.

[0093] Similar to the analysis above, compared to Figure 6 , Figure 7 The frictional forces acting on the conveyor belt 100 are in exactly opposite directions. Therefore, the functional relationship between the rotation angle θ and the resultant force F2 is:

[0094]

[0095] Also taking into account the effect of gravity, F2 can be calculated using the following functional relationship:

[0096]

[0097] It is easy to understand that if the horizontal tensioning roller 200 is selected, the effect of gravity G does not need to be considered, and the functional relationship (1) and (3) can be used directly. If the vertical tensioning roller 200 is selected, the functional relationship (1) and (3), or the functional relationship (2) and (4) can be used. The latter is more accurate.

[0098] like Figure 7As shown, the conveyor belt 100 is offset downwards at this time. If the calculated resultant force F2 is greater than 0, the direction of the resultant force F2 is opposite to the direction of offset, which can help the conveyor belt 100 move upwards to correct the offset. If the calculated resultant force F2 is less than 0, it means that the direction of the resultant force F2 is the same as the direction of offset, which will exacerbate the downward movement of the conveyor belt 100. In this case, the direction of rotation of the conveyor belt 100 and / or the rotation angle of the conveyor belt 100 can be changed until a suitable rotation angle and rotation direction are found so that the calculated resultant force F2 is greater than 0, that is, the direction of the calculated resultant force F2 is opposite to the direction of offset. The final obtained rotation angle is set as the set angle and the corresponding rotation direction is set as the set direction. Then the controller 505 can send a control signal to the drive component 503, and the drive component 503 drives the tension roller 200 to rotate according to the set angle and set direction to achieve the purpose of correction.

[0099] Accordingly, this application embodiment also provides a method for correcting the belt alignment of a belt conveyor 100, employing the aforementioned belt alignment device for the belt conveyor 100, the method comprising:

[0100] Step 1: Determine whether the conveyor belt 100 has shifted and the direction of the shift based on the signal detected by the offset detection component 506;

[0101] Step 2: If a deviation occurs, assume that the tensioning roller 200 rotates relative to its current position in either a first direction or a second direction, where the first and second directions are opposite, for example, upward and downward respectively; and obtain the tension F of the conveyor belt 100 and the friction force f of the conveyor belt 100 at the roller based on the signals detected by the tension detection component and the friction coefficient detection component 504, and then obtain the resultant force F2 on the conveyor belt 100 after the tensioning roller 200 rotates; when the resultant force F2 and the direction of the deviation of the conveyor belt 100 are opposite, then determine that the rotation angle and rotation direction of the tensioning roller 200 relative to its current position under the assumed condition are the set angle and set direction;

[0102] As mentioned earlier, when the offset detection component 506 is positioned on the vertical tension roller 200, the conveyor belt 100 offsets in either the upward or downward direction. The tension roller 200 needs to rotate in a vertical plane, which is, for example, the vertical plane where the tension of the tension roller 200 is located. The rotation direction is either clockwise or counterclockwise, i.e., the first direction is clockwise and the second direction is counterclockwise, or vice versa. Similarly, if the offset detection component 506 is positioned on the horizontal tension roller 200, the conveyor belt 100 offsets in either the left or right direction. The tension roller 200 needs to rotate in a horizontal plane, which is, for example, the horizontal plane where the tension of the tension roller 200 is located. The rotation direction is either clockwise or counterclockwise relative to the horizontal plane, i.e., the first and second directions are either clockwise or counterclockwise.

[0103] Step 3: Control the drive unit 503 to drive the roller to rotate in the set direction and at the set angle until the conveyor belt 100 returns to the center.

[0104] Please continue to refer to this. Figure 9 , Figure 9 This is a flowchart of the belt correction method for the conveyor belt 100 of the belt conveyor in the embodiments of this application.

[0105] In step two above, the set angle of rotation of the tensioning roller 200 is determined through the following steps:

[0106] Step S1: Assuming that the tensioning roller 200 rotates to the first predetermined angle in the first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component 504, the tension of the conveyor belt 100 and the friction force of the conveyor belt 100 at the roller are obtained, and then the resultant force F2 of the conveyor belt 100 at this time is obtained.

[0107] Step S2: If the direction of the resultant force is opposite to the direction of the conveyor belt 100 offset, proceed to step S3; if the direction of the resultant force is the same as the direction of the conveyor belt 100 offset, proceed to step S4.

[0108] Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction;

[0109] Step S4: Assume that the tensioning roller 200 rotates in the second direction by a second predetermined angle to obtain the resultant force F2 on the conveyor belt 100 at this time;

[0110] Step S5: If the direction of the resultant force is opposite to the direction of the conveyor belt 100 offset, proceed to step S6; if the direction of the resultant force is the same as the direction of the conveyor belt 100 offset, proceed to step S7.

[0111] Step S6: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction;

[0112] Step S7: Repeat step S1, and each time it is repeated, increase the values ​​of the first predetermined angle and the second predetermined angle.

[0113] In this embodiment, the first predetermined angle and the second predetermined angle can be set to be equal, for example, 5°, which facilitates control and data comparison. Of course, the first predetermined angle and the second predetermined angle can also be set to be unequal. If the set angle and set direction cannot be obtained after rotating 5° in both the first and second directions, step S1 can be repeated. Each time it is repeated, the values ​​of the first predetermined angle and the second predetermined angle can be increased, for example, by 5° each time. Figure 9 The test can be conducted at a maximum of 5°, 10°, 15°, and 20°. Of course, the rotation angle can be controlled within a certain range. If a larger rotation angle still fails to achieve the desired correction, this method will not be used again to prevent the tension roller from becoming excessively misaligned and affecting operational safety. It is understandable that the rotation angle setting range and the increment of the angle each time can be set according to specific requirements.

[0114] It is understood that the rotation tests in the forward and reverse directions in the above embodiments are performed alternately, but they can actually be performed simultaneously. For example, the set angle of rotation of the tensioning roller 200 can be determined by the following steps:

[0115] Step S1: Assuming the tension roller 200 rotates a first predetermined angle in the first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component 504, the tension of the conveyor belt 100 and the friction force of the conveyor belt 100 at the tension roller 200 are obtained, and then the first resultant force on the conveyor belt 100 at this time is obtained; and assuming the tension roller 200 rotates a second predetermined angle in the second direction, which is opposite to the first direction, the second resultant force on the conveyor belt 100 at this time is obtained;

[0116] S2. If the direction of the first resultant force is opposite to the direction of the conveyor belt 100 offset, proceed to step S3. If the direction of the second resultant force is opposite to the direction of the conveyor belt 100 offset, proceed to step S4. If the direction of the first resultant force and the direction of the second resultant force are the same as the direction of the conveyor belt 100 offset, repeat step S1, and each time it is repeated, increase the value of the first predetermined angle and the second predetermined angle.

[0117] Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction;

[0118] Step S4: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction.

[0119] It is understood that in this embodiment, only step three controls the tension roller 200 to rotate for actual correction. In step two, the resultant force F2 is calculated by assuming the tension roller 200 rotates, in order to test the set angle and set direction required in step three. In step two, the required set angle and set direction may be obtained through one calculation, or multiple calculations may be required. In addition to calculating by alternating rotation directions as mentioned above, or calculating the same rotation angle in two directions simultaneously, other methods can also be used. For example, when the set angle range and the angle increment in each round of calculation are considered, the number of calculation sets in the first direction and the number of calculation sets in the second direction can be suppressed. Taking an angle increment of 5° and an angle range of 20° as an example, four sets of data are calculated in each direction. Alternatively, eight sets of data under the current tension and friction can be calculated simultaneously. The rotation angle and rotation direction corresponding to the set of data in which the resultant force F2 direction is opposite to the offset direction are selected as the set angle and set direction in step three. Of course, if the resultant force F2 direction of more than one set of data meets the requirements, the set of data with a larger resultant force F2 can be selected for control in step three to improve the correction speed.

[0120] Furthermore, in the above embodiments, in step three, the conveyor belt 100 can be controlled to gradually return to the correct position; that is, after the correction is completed, the tensioning roller 200 needs to return to its position before the correction. Figure 1 In other words, returning to the vertical position allows the tension roller 200 to rotate relatively slowly and gradually to the vertical position, which is beneficial to the stability of the entire conveyor belt 100 returning to the correct position.

[0121] Furthermore, in the above embodiments, when determining whether the conveyor belt 100 has deviated, a predetermined range of the deviance amount of the conveyor belt 100 can be set. If the deviance amount of the conveyor belt 100 detected by the deviance detection component 506 is within the predetermined range, it is determined that the conveyor belt 100 has not deviated; otherwise, it is determined that a deviance has occurred. That is, a certain amount of deviance of the conveyor belt 100 is allowed, as long as the deviance does not affect the normal conveying of the conveyor belt 100 and meets the conveying safety requirements. For example, the predetermined range of the deviance amount can be set to within 20mm. If the absolute value of L-L' is within 20mm, it can be considered that no deviance has occurred; only when it is greater than 20mm is it determined that a deviance has occurred. The predetermined range of the deviance amount can be set according to the actual situation.

[0122] It's not hard to understand. Figure 1In this embodiment, only one vertically arranged tension roller 200 is used as an example for the correction setting. However, each tension roller 200 is set to be able to rotate relative to the corresponding first support 501, and each tension roller 200 is equipped with an offset detection component 506. Therefore, the conveyor belt 100 of each tension roller 200 can be corrected to better achieve the correction purpose. However, it can be seen that even if only the conveyor belt 100 at the position of one tension roller 200 is corrected, a certain correction purpose can be achieved.

[0123] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A belt alignment device for a belt conveyor, wherein the conveyor belt is tensioned by a plurality of tensioning rollers, characterized in that, The correction device includes: An offset detection component is used to detect whether the conveyor belt has shifted. A tension detection component, wherein the tension detection component is used to detect the tension of the conveyor belt; Friction coefficient detection component, used to detect the friction coefficient of the conveyor belt; A first support, at least one of the tensioning rollers is provided with the first support, and the tensioning roller and the first support are rotatably connected; The drive component, when the offset detection component detects that the conveyor belt has deviated, drives the tension roller to rotate relative to the first support in a set direction by a set angle, the set direction and the set angle being determined based on the detected tension and the friction force determined by the detected friction coefficient; It also includes a second support, at least one of the tensioning rollers is equipped with the second support, the friction coefficient detection component includes a cantilever and a contact, one end of the cantilever is connected to the second support, and the other end is provided with the contact, the contact is used to contact the conveyor belt; The material of the contact is the same as the material of the conveyor belt; The offset detection component includes a distance sensor, which is used to measure the distance between itself and the side edge of the conveyor belt, and to determine whether the conveyor belt has shifted based on the change in distance.

2. The belt alignment device for a belt conveyor according to claim 1, characterized in that, The driving component includes a driving cylinder, the tensioning roller is mounted on a roller shaft, the roller shaft has a first end and a second end, the first bracket and the second end are rotatably connected, and the piston rod of the driving cylinder is connected to the first end of the roller shaft to drive the roller shaft to rotate the tensioning roller relative to the first bracket.

3. A method for correcting the belt alignment of a belt conveyor, characterized in that, The belt alignment device for a belt conveyor as described in any one of claims 1-2, wherein the belt alignment method comprises: Step 1: Determine whether the conveyor belt has shifted and the direction of the shift based on the signal detected by the offset detection component; Step 2: If a deviation occurs, assume that the tensioning roller rotates relative to its current position in either a first direction or a second direction, where the first direction and the second direction are opposite. Based on the signals detected by the tension detection component and the friction coefficient detection component, obtain the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller, and then obtain the resultant force on the conveyor belt after the tensioning roller rotates. When the resultant force is opposite to the direction of the conveyor belt deviation, determine that the rotation angle and rotation direction of the tensioning roller relative to its current position under the assumed condition are a set angle and a set direction. Step 3: Control the drive unit to drive the tensioning roller to rotate at a set angle in the set direction until the conveyor belt returns to the correct position.

4. The belt alignment method for a belt conveyor according to claim 3, characterized in that, In step two, the set angle of rotation of the tensioning roller is determined through the following steps: Step S1: Assuming the tensioning roller rotates a first predetermined angle in the first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component, the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller are obtained, and then the resultant force on the conveyor belt at this time is obtained. Step S2: If the direction of the resultant force is opposite to the direction of the conveyor belt offset, proceed to step S3; if the direction of the resultant force is the same as the direction of the conveyor belt offset, proceed to step S4. Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction; Step S4: Assuming the tensioning roller rotates a second predetermined angle in the second direction, obtain the resultant force on the conveyor belt at this time; Step S5: If the direction of the resultant force is opposite to the direction of the conveyor belt offset, proceed to step S6; if the direction of the resultant force is the same as the direction of the conveyor belt offset, proceed to step S7. Step S6: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction; Step S7: Repeat step S1, and each time it is repeated, increase the values ​​of the first predetermined angle and the second predetermined angle.

5. The belt alignment method for a belt conveyor according to claim 3, characterized in that, In step two, the set angle of rotation of the tensioning roller is determined through the following steps: Step S1: Assuming the tensioning roller rotates a first predetermined angle in a first direction, and based on the signals detected by the tension detection component and the friction coefficient detection component, the tension of the conveyor belt and the friction force of the conveyor belt at the tensioning roller are obtained, and then the first resultant force on the conveyor belt at this time is obtained; and assuming the tensioning roller rotates a second predetermined angle in a second direction, the second direction being opposite to the first direction, the second resultant force on the conveyor belt at this time is obtained. Step S2: If the direction of the first resultant force is opposite to the direction of the conveyor belt offset, proceed to step S2. If the direction of the second resultant force is opposite to the direction of the conveyor belt offset, proceed to step S3. If both the direction of the first resultant force and the direction of the second resultant force are the same as the direction of the conveyor belt offset, repeat step S1. Each time it is repeated, the values ​​of the first predetermined angle and the second predetermined angle are increased. Step S3: Determine the first predetermined angle of the current rotation as the set angle, and the first direction as the set direction; Step S4: Determine the second predetermined angle of the current rotation as the set angle, and the second direction as the set direction.

6. The belt alignment method for a belt conveyor according to claim 4 or 5, characterized in that, The first predetermined angle and the second predetermined angle are equal.

7. The belt alignment method for a belt conveyor according to claim 6, characterized in that, In step two, the first predetermined angle and the second predetermined angle increase by the same amount each time, and the first predetermined angle and the second predetermined angle do not exceed the set angle range.

8. The method for correcting the belt alignment of a belt conveyor according to any one of claims 3-5, characterized in that, A predetermined range for the offset of the conveyor belt is set. If the offset detected by the offset detection component is within the predetermined range, it is determined that the conveyor belt has not shifted; otherwise, it is determined that an offset has occurred.

9. A belt conveyor, characterized in that, It includes a conveyor belt, and a belt alignment device for the belt conveyor as described in any one of claims 1-2.

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