A constant power control method for a coal mining machine

Abstract

The application discloses a constant power control method of a coal mining machine, and comprises the following steps: calculation of a single motor constant power influencing factor, calculation of a multi-motor constant power deceleration value, and determination of a deceleration mode. Real-time monitoring of the operation of the equipment is realized through intelligent means, important parameters of the operation of the equipment are collected at any time, and the traction speed of the coal mining machine is automatically adjusted by relying on the parameters, so that the safety and reliability of the operation of the equipment are ensured, the maintenance cost of the equipment is reduced, and the work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of the coal mining industry, and in particular to a constant power control method for a coal mining machine. Background Technology

[0002] During the traction process, coal mining machines are affected by geological conditions, such as coal seam hardness, gangue, and coal seam slope; as well as by coal cutting techniques, such as cutting depth and traction speed. Under the influence of these factors, the coal mining machine may experience increased cutting current, cutting motor temperature, traction motor current, and traction motor temperature during coal cutting. In such situations, relying on the coal mining machine operator to manually adjust the traction speed increases the operator's workload and reduces the machine's responsiveness. This not only reduces mining efficiency but can also seriously damage the equipment.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a constant power control method for a coal mining machine, which can ensure the safety and reliability of equipment operation, reduce equipment maintenance costs, and improve work efficiency.

[0005] To achieve the above objectives, the present invention provides a constant power control method for a coal mining machine, comprising the following steps:

[0006] (1) Calculation of factors affecting constant power of a single motor;

[0007] (2) Calculation of constant power deceleration value of multiple motors;

[0008] (3) Determining the deceleration method.

[0009] Furthermore, step (1) specifically involves:

[0010] Adjust the two factors that affect constant power: motor temperature and motor current;

[0011] Set three motor temperature values: temperature-allowed acceleration setting value, temperature-constant power deceleration setting value, and the value at which deceleration is required for each degree Celsius the temperature exceeds;

[0012] Set three motor current values: allowable current acceleration setting, constant power current deceleration setting, and the value at which deceleration is required when the current exceeds a certain value per degree Celsius.

[0013] Furthermore, step (2) specifically involves:

[0014] Based on the calculation method of the influencing factors of constant power of a single motor, appropriate parameters are set for the left and right cutting motors. When the temperature or current of the cutting motor increases, the corresponding constant power deceleration value of the single motor is calculated, and the result of whether automatic acceleration is allowed is obtained.

[0015] Furthermore, step (3) specifically involves:

[0016] Based on the remote control of the traction speed, a constant power deceleration value is introduced. The final traction speed is obtained by subtracting the constant power deceleration value from the traction speed, and the result is output to the traction frequency converter.

[0017] Compared with the prior art, the constant power control method for a coal mining machine according to the present invention has the following advantages:

[0018] Beneficial effects:

[0019] By using intelligent methods, the real-time monitoring of equipment operation can be achieved, and important parameters of equipment operation can be collected at any time. Based on these parameters, the traction speed of the coal mining machine can be automatically adjusted to ensure the safety and reliability of equipment operation, reduce equipment maintenance costs, and improve work efficiency. Attached Figure Description

[0020] Figure 1 This is a flowchart of a constant power control method for a coal mining machine according to an embodiment of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0023] According to the preferred embodiment of the coal mining machine constant power control method of the present invention, real-time monitoring of equipment operation is achieved through intelligent means, and important parameters of equipment operation are collected at any time. Based on these parameters, the traction speed of the coal mining machine is automatically adjusted to ensure the safety and reliability of equipment operation, reduce equipment maintenance costs, and improve work efficiency.

[0024] like Figure 1 As shown, the constant power control method for a coal mining machine according to a preferred embodiment of the present invention includes the following steps:

[0025] (1) Calculation of factors affecting constant power of a single motor

[0026] For a motor, there are two factors that affect constant power: the motor temperature and the motor current. An increase in either of these factors indicates that the motor load is too high, and adjustments need to be made to reduce the motor load and maintain it within a reasonable range.

[0027] There are three temperature settings: one is the allowed acceleration setting (TempSeVvalue_1), another is the constant power deceleration setting (TempSeVvalue_2), the allowed acceleration setting is less than the constant power deceleration setting, and the third is the deceleration value required per degree Celsius exceeding the allowed acceleration setting (TempCoefficient). When the actual temperature exceeds TempSeVvalue_2, automatic acceleration is not allowed, and the deceleration value is obtained by multiplying the excess value by the coefficient. When the actual temperature is between TempSeVvalue_1 and TempSeVvalue_2, automatic acceleration is not allowed, and the deceleration value is 0, meaning the current speed is maintained unless manually adjusted. When the actual temperature is below TempSeVvalue_1, automatic acceleration is allowed.

[0028] The current also has three settings: one is the allowed acceleration setting (CurSeVvalue_1), another is the constant power deceleration setting (CurSeVvalue_2), the allowed acceleration setting is less than the constant power deceleration setting, and the third is the deceleration value required per ampere exceeding the allowable acceleration setting (CurCoefficient). When the actual current value exceeds CurSeVvalue_2, automatic acceleration is not allowed, and a deceleration value is obtained by multiplying the excess value by a coefficient. When the actual current value is between CurSeVvalue_1 and CurSeVvalue_2, automatic acceleration is not allowed, and the deceleration value is 0, meaning the current speed is maintained unless manually adjusted. When the actual current value is below CurSeVvalue_1, automatic acceleration is allowed.

[0029] Automatic acceleration refers to the process where, when the motor load falls below a set value, the speed gradually recovers and can eventually reach the speed it was before deceleration. This is an important step in constant power speed regulation.

[0030] (2) Calculation of constant power deceleration value of multi-motor

[0031] Based on the calculation method for the influencing factors of single-motor constant power, appropriate parameters are set for the left and right cutting motors. When the temperature or current of the cutting motor increases, the corresponding single-motor constant power deceleration value is calculated, and the result of whether automatic acceleration is allowed is obtained. Similarly, based on the same method, appropriate parameters are also set for the left and right traction motors. When the temperature or current of the cutting motor increases, the corresponding single-motor constant power deceleration value is calculated, and the result of whether automatic acceleration is allowed is also obtained.

[0032] The cutting motor refers to the motor that drives the drum to rotate, and its power is mainly determined by the coal seam hardness and cutting depth. The traction motor refers to the motor that drives the coal mining machine to move left and right, and its power is mainly determined by the traction speed and the coal seam slope. These are the two most powerful parts of the entire coal mining machine and are also the determining factors for constant power. The final constant power deceleration value must be determined by comprehensively considering the deceleration values ​​of the two types of motors.

[0033] Calculate the maximum deceleration value of the four motors. If the maximum value is greater than 0, it means that a motor has triggered the constant power function. First, set a cycle period. This cycle period determines how often the deceleration value is increased. Each time the cycle time is reached, the deceleration value is increased once. The increase is proportional to the maximum calculated deceleration value of the four motors.

[0034] When the maximum value is 0, it means that the temperature and current of all motors are within the set range. At this point, it is necessary to determine the automatic acceleration allowance of the four motors. If the automatic acceleration allowance result of one or more of the four motors is FALSE, it means that some motors are not allowed to accelerate automatically, and the traction speed needs to remain constant. If the automatic acceleration allowance results of all four motors are TRUE, a cycle time needs to be set. This cycle time determines how often the deceleration value is reduced. Each time the cycle time is reached, the deceleration value is reduced by one, and the reduction amount is determined by the set value, until the deceleration value is reduced to 0, i.e., the original speed is restored.

[0035] (3) Determination of deceleration method

[0036] Without considering constant power deceleration, the traction speed is determined by the traction control button on the remote control. The function block receives commands from the traction control button on the remote control. When traction to the right, pressing the left traction button decreases the traction speed; pressing the stop traction button stops the traction; pressing the right traction button increases the traction speed. When traction to the left, pressing the left traction button increases the traction speed; pressing the stop traction button stops the traction; pressing the right traction button decreases the traction speed.

[0037] Based on the remote control of the traction speed, a constant power deceleration value is introduced. The final traction speed is obtained by subtracting the constant power deceleration value from the traction speed, and the result is output to the traction frequency converter.

[0038] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A constant power control method for a coal mining machine, characterized in that, Includes the following steps: (1) Calculation of factors affecting constant power of a single motor; (2) Calculation of constant power deceleration value of multiple motors; (3) Determining the deceleration method; Step (1) is as follows: Adjust the two factors that affect constant power: motor temperature and motor current; Set three motor temperature values: temperature-allowed acceleration setting value, temperature-constant power deceleration setting value, and the value at which deceleration is required for each degree Celsius the temperature exceeds; Set three motor current values: allowable current acceleration setting, constant power current deceleration setting, and the value at which deceleration is required when the current exceeds each ampere. Step (2) is as follows: Based on the calculation method of the influencing factors of constant power of a single motor, appropriate parameters are set for the left and right cutting motors. When the temperature or current of the cutting motor increases, the corresponding constant power deceleration value of the single motor is calculated, and the result of whether automatic acceleration is allowed is obtained. The constant power deceleration value is obtained by multiplying the portion exceeding the temperature constant power deceleration set value by a coefficient. The constant power deceleration value is also obtained by multiplying the portion exceeding the current constant power deceleration set value by a coefficient. Step (3) is as follows: Based on the remote control of the traction speed, a constant power deceleration value is introduced. The final traction speed is obtained by subtracting the constant power deceleration value from the traction speed, and the result is output to the traction frequency converter. Calculate the maximum deceleration value of the cutting motor and traction motor. When the maximum value is greater than 0, it indicates that a motor has triggered the constant power function. First, set a cycle period. This cycle period determines how often the deceleration value is increased. The deceleration value is increased once every cycle period. The increase is proportional to the calculated maximum deceleration value of the cutting motor and traction motor.

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