A method for automatically adjusting the walking speed of a scraper

Abstract

The application discloses a kind of methods for automatically adjusting the walking speed of scraper, comprising the following steps: (1) by 3D scanner, the length L1 of the material surface contacted by the scraper when the scraper starts to level and the length L2 of the material surface contacted by the scraper when the scraper finishes leveling are obtained;(2) an energy conversion relationship model is established according to L1 and K2;including the following steps: (3) determine the energy coefficient in the model;(4) calculate the descending angle of the scraper, and calculate the maximum walking speed of the scraper according to the maximum safe current;The application controls the running speed of the scraper in real time, and can perform the operation of the scraper under the maximum safe current during the operation of the scraper, improves the safe operation of the equipment, and reduces the occurrence of failure rate;And under the premise of safety, operate at the maximum speed and maximum angle, greatly improve the operation efficiency;Improve the intelligent level of the scraper.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, and specifically to a method for automatically adjusting the traveling speed of a scraper conveyor. Background Technology

[0002] The current scraper conveyor operation process is divided into leveling and unloading operations. Both involve the scraper conveyor's boom lowering at a certain angle and moving back and forth at a certain speed. Typically, the unloading angle and moving speed are set during production. Setting the angle too large or the moving speed too fast can easily lead to overload and power tripping of the scraper conveyor, causing equipment failure and increasing maintenance risks. Conversely, setting the angle too small or the moving speed too slow will result in insufficient raw material supply, affecting subsequent production needs.

[0003] Currently, when performing operations, the angle is often set manually, and parameters are set based on experience. However, problems such as equipment power outages and insufficient power supply still occur. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a method for automatically adjusting the operating speed of a scraper conveyor, which solves the problems of low efficiency and unstable material output of automatic scraper conveyor operation compared to manual operation.

[0005] Technical solution: The present invention provides a method for automatically adjusting the traveling speed of a scraper conveyor, comprising the following steps:

[0006] (1) The length L1 of the material surface contacted by the scraper at the beginning of the scraper leveling and the length L2 of the material surface contacted by the scraper at the end of the leveling are obtained by the 3D scanner;

[0007] (2) Establish an energy conversion relationship model based on L1 and L2; including the following steps:

[0008] (21) Calculate the volume of material taken out by the scraper conveyor;

[0009] (22) Calculate the power of the scraper conveyor for material handling based on the volume;

[0010] (23) Calculate the power of the scraper conveyor drive motor;

[0011] (24) Obtain the power of the scraper operation and the power of the scraper drive motor according to steps (21)-(24), and establish the correlation relationship;

[0012] (3) Determine the energy coefficients in the model;

[0013] (4) Calculate the scraper descent angle and calculate the maximum traveling speed of the scraper conveyor based on the maximum safe current.

[0014] Furthermore, step (21) is as follows: Assuming the scraper conveyor's traveling speed is v and the scraper's descent angle is β, then the scraper's traveling distance within the time range Δt is vΔt; therefore, the volume of material scraped away is:

[0015]

[0016] Furthermore, step (22) is as follows: Assume the rotational speed ω of the scraper conveyor's chain plate is constant, then the displacement of the scraped material pile per unit time is s, and assuming the current scraper conveyor angle is α, then the work done by the scraped material is:

[0017]

[0018] Where β is the scraper descent angle, v is the scraper conveyor travel speed, ρ is the material bulk density, g is the gravitational acceleration, α is the current angle of the scraper conveyor, and s is the chain plate rotation distance per unit time.

[0019] Furthermore, step (23) is as follows: the power of the scraper conveyor is:

[0020] P = UI

[0021] Where I is the motor current and U is the voltage applied to the motor; introducing the loss factor γ, the final output power is:

[0022] P=ηγUI

[0023] Where η is the conversion efficiency of the motor; γ is the loss factor.

[0024] Furthermore, step (24) is as follows:

[0025]

[0026] Where L1 and L2 are the lengths of the scraper contacting the material pile as scanned by the scanner, ρ is the material pile density, g is the gravitational acceleration, α is the current angle of the scraper conveyor, s is the distance the chain plate rotates per unit time, U is the motor voltage, and η is the motor conversion efficiency.

[0027] Furthermore, step (3) is as follows: Based on the formula transformation in step (24), the following formula is obtained:

[0028]

[0029] in, Representing the energy coefficient; introducing the loss factor γ, the above equation changes to obtain:

[0030]

[0031] Furthermore, step (4) is as follows: First, based on the maximum safe current of the scraper conveyor during operation, the following formula is obtained:

[0032]

[0033] Then, the scraper descent pitch angle is set, the maximum traveling speed of the scraper machine is calculated in real time, and the result is written into the PLC. The pitch angle is a fixed value of 0.4° to 0.8° for each descent.

[0034] The present invention discloses a system for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, comprising:

[0035] Data acquisition module: used by the 3D scanner to acquire the length L1 of the material surface in contact with the scraper at the beginning of the scraper leveling process and the length L2 of the material surface in contact with the scraper at the end of the leveling process;

[0036] Model building module: used to build an energy conversion relationship model based on L1 and L2; includes the following steps:

[0037] Coefficient calculation module: used to determine the energy coefficients in the model;

[0038] Descent Angle Calculation Module: Used to calculate the descent angle of the scraper and the maximum traveling speed of the scraper conveyor based on the maximum safe current.

[0039] The device of the present invention includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements a method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, as described in any one of the present invention.

[0040] The present invention provides a storage medium storing a computer program, characterized in that the computer program is designed to implement, when running, a method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, as described in any one of the claims.

[0041] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: By controlling the running speed of the scraper conveyor in real time, the present invention can carry out the scraper conveyor operation under the maximum safe current during the operation of the scraper conveyor, thereby improving the safety of the equipment and reducing the occurrence of failure rate; and under the premise of ensuring safety, it can operate at the maximum speed and the maximum angle, which greatly improves the operation efficiency; and improves the intelligence level of the scraper conveyor. Attached Figure Description

[0042] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0044] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for automatically adjusting the working speed of a scraper conveyor, comprising the following steps:

[0045] (1) The length L1 of the material surface contacted by the scraper at the beginning of the scraper leveling and the length L2 of the material surface contacted by the scraper at the end of the leveling are obtained by the 3D scanner;

[0046] (2) Establish an energy conversion relationship model based on L1 and L2; including the following steps:

[0047] (21) Calculate the volume of material removed by the scraper conveyor; specifically as follows: Assuming the scraper conveyor's traveling speed is v and the scraper's descent angle is β, then the scraper travels a distance vΔt within the time range of Δt; therefore, the volume of material scraped away is:

[0048]

[0049] (22) Calculate the power of the scraper conveyor for material removal based on volume; specifically as follows: Assume the rotational speed of the scraper conveyor chain is constant at ω, then the displacement of the material pile scraped away per unit time is s, and assuming the current scraper conveyor angle is α, then the work done by the scraped material is:

[0050]

[0051] Where β is the scraper descent angle, v is the scraper conveyor travel speed, ρ is the material bulk density, g is the gravitational acceleration, α is the current angle of the scraper conveyor, and s is the chain plate rotation distance per unit time.

[0052] (23) Calculate the power of the scraper conveyor drive motor; specifically: the scraper conveyor power is:

[0053] P = UI

[0054] Where I is the motor current and U is the voltage applied to the motor; introducing the loss factor γ, the final output power is:

[0055] P=ηγUI

[0056] Where η is the conversion efficiency of the motor; γ is the loss factor.

[0057] (24) Based on steps (21)-(24), obtain the power of the scraper operation and the power of the scraper machine drive motor, and establish a correlation relationship; specifically as follows:

[0058]

[0059] Where L1 and L2 are the lengths of the scraper contacting the material pile as scanned by the scanner, ρ is the material pile density, g is the gravitational acceleration, α is the current angle of the scraper conveyor, s is the distance the chain plate rotates per unit time, U is the motor voltage, and η is the motor conversion efficiency.

[0060] (3) Determine the energy coefficient in the model; specifically as follows: Based on the formula transformation in step (24), the following formula is obtained:

[0061]

[0062] in, Representing the energy coefficient; introducing the loss factor γ, the above equation changes to obtain:

[0063]

[0064] (4) Calculate the scraper descent angle and the maximum traveling speed of the scraper conveyor based on the maximum safe current. Specifically: First, based on the maximum safe current of the scraper conveyor during operation, the following formula is obtained:

[0065]

[0066] Then, the scraper descent pitch angle is set, the maximum traveling speed of the scraper machine is calculated in real time, and the result is written into the PLC. The pitch angle is a fixed value of 0.8° for each descent.

[0067] This invention also provides a system for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, comprising:

[0068] Data acquisition module: used by the 3D scanner to acquire the length L1 of the material surface in contact with the scraper at the beginning of the scraper leveling process and the length L2 of the material surface in contact with the scraper at the end of the leveling process;

[0069] Model building module: used to build an energy conversion relationship model based on L1 and L2; includes the following steps:

[0070] Coefficient calculation module: used to determine the energy coefficients in the model;

[0071] Descent Angle Calculation Module: Used to calculate the descent angle of the scraper and the maximum traveling speed of the scraper conveyor based on the maximum safe current.

[0072] This invention also provides a device, including a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, when the processor executes the program, it implements a method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations as described in any one of the embodiments.

[0073] This invention also provides a storage medium storing a computer program, the computer program being designed to implement, when running, any of the methods described above for automatically adjusting the traveling speed of a scraper conveyor during material leveling.

Claims

1. A method for automatically adjusting the traveling speed of a scraper conveyor, characterized in that, Includes the following steps: (1) The length of the material surface in contact with the scraper at the start of the scraper machine leveling is obtained by a 3D scanner. The length of the scraper contact surface at the end of the flat material process ; (2) According to Establish an energy conversion relationship model; including the following steps: (21) Calculate the volume of material taken up by the scraper conveyor; specifically as follows: Assume the traveling speed of the scraper conveyor is v, and the downward angle of the scraper is... Then in The scraper travels a distance v within the time range The volume of the scraped material is: ； (22) Calculate the power of the scraper conveyor for material handling based on the volume; specifically as follows: Assume the rotational speed of the scraper conveyor's chain plate is... If the displacement of the material pile scraped away per unit time is constant, then the displacement of the material pile scraped away per unit time is And assuming the current scraper conveyor angle is The work done by the scraped material is: ； in, v is the downward angle of the scraper, and v is the traveling speed of the scraper conveyor. Where g is the bulk density of the material, and g is the acceleration due to gravity. The angle of the scraper conveyor is s, and the distance the chain plate rotates per unit time is s. (23) Calculate the power of the scraper conveyor drive motor; the specific details are as follows: The power of the scraper conveyor is: ； Where I is the motor current and U is the voltage applied to the motor; a loss factor is introduced. The final output power is: ； in, The conversion efficiency of the motor; As the loss factor; (24) Based on steps (21)-(23), obtain the power of the scraper operation and the power of the scraper drive motor, and establish the correlation relationship; specifically as follows: ； in, , This refers to the length of the material pile that the scraper contacts, as scanned by the scanner. Where g is the bulk density of the material, and g is the acceleration due to gravity. The angle of the scraper conveyor is denoted by s, and s is the distance the chain plate rotates per unit time. This is the motor voltage. The conversion efficiency of the motor; (3) Determine the energy coefficient in the model; specifically as follows: Based on the formula transformation in step (24), the following formula is obtained: ； in, ; represents the energy coefficient; introduces a loss factor for loss. The above equation can be transformed to obtain: ； (4) Calculate the scraper descent angle and calculate the maximum traveling speed of the scraper machine based on the maximum safe current.

2. The method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operation according to claim 1, characterized in that, The specific steps (4) are as follows: First, based on the maximum safe current of the scraper conveyor during operation, the following formula is obtained: ； Then, the scraper descent pitch angle is set, the maximum traveling speed of the scraper machine is calculated in real time, and the result is written into the PLC. The pitch angle is a fixed value of 0.4°~0.8° for each descent.

3. A system for automatically adjusting the traveling speed of a scraper conveyor during material leveling, characterized in that, The method described in any one of claims 1-2 is used to implement the method, comprising: Data acquisition module: Used by a 3D scanner to acquire the length of the material surface in contact with the scraper at the start of the scraper conveyor leveling process. The length of the scraper contact surface at the end of the flat material process ; Model building module: used to build upon... Establish an energy conversion relationship model; including the following steps: Coefficient calculation module: used to determine the energy coefficients in the model; Descent Angle Calculation Module: Used to calculate the descent angle of the scraper and the maximum traveling speed of the scraper conveyor based on the maximum safe current.

4. An apparatus comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements a method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, as described in any one of claims 1-2.

5. A storage medium storing a computer program, characterized in that, The computer program is designed to implement, at runtime, a method for automatically adjusting the traveling speed of a scraper conveyor during material leveling operations, as described in any one of claims 1-2.

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