CN108612531B - Control method and system for wire saw - Google Patents
Control method and system for wire saw Download PDFInfo
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- CN108612531B CN108612531B CN201810224883.2A CN201810224883A CN108612531B CN 108612531 B CN108612531 B CN 108612531B CN 201810224883 A CN201810224883 A CN 201810224883A CN 108612531 B CN108612531 B CN 108612531B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
- E21C47/10—Machines for obtaining or the removal of materials in open-pit mines for quarrying stone, sand, gravel, or clay
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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Abstract
The invention provides a rope saw control method and system, and relates to the field of mining equipment. A rope saw control method is used for realizing the safe control of the rope saw for cutting stone materials, and comprises the following steps: obtaining a current frequency error value of a rope saw motor; calculating a frequency value for outputting to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value; and calculating the frequency value for outputting to the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value for outputting to the rope saw motor and the frequency value of the rope saw motor at the previous moment. A rope saw control system is also provided. According to the invention, the frequency error value of the rope saw motor and the frequency of the rope saw motor at the previous moment are obtained, and the frequency output to the rope saw motor and the walking motor is calculated and adjusted, so that the synchronous adjustment of the frequency of the rope saw motor and the frequency of the walking motor are realized, the precision is improved, a PLC (programmable logic controller) system is not required to be additionally installed, the cost is reduced, and the anti-interference performance is also improved.
Description
Technical Field
The invention relates to the field of mining equipment, in particular to a rope saw control method and a rope saw control system.
Background
The rope sawing machine is used for mining granite, marble and other stone ores, one motor is used for driving the sawing rope to cut stone, and the other motor drives the whole sawing machine to move back and forth along the direction perpendicular to the stone. Wherein the speed of movement and the speed of the wire saw together determine the amount of tension in the wire saw when it is in operation. If the tension is not controlled timely, the sawing rope is easy to break. At present, the existing rope saw usually adopts a Programmable Logic Controller (PLC) to control two frequency converters, the output current of the rope saw frequency converter is transmitted to a walking frequency converter through analog quantity to realize automatic control, when the adjustment is needed, the parameters of the two frequency converters need to be adjusted, and the rope saw has certain debugging difficulty for new users.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for controlling a wire saw, aiming at the problems of high cost, poor precision and anti-interference performance, low adjustment speed and the like of the control scheme of the existing wire saw.
A rope saw control method is used for realizing the safe control of the rope saw for cutting stone materials, and comprises the following steps:
obtaining a current frequency error value of a rope saw motor;
calculating a frequency value for outputting to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value;
and calculating the frequency value for outputting to the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value for outputting to the rope saw motor and the frequency value of the rope saw motor at the previous moment.
In one embodiment, the step of obtaining the current frequency error value of the rope saw motor comprises:
acquiring a synthesized current value of a three-phase current value of the rope saw motor under a two-phase coordinate system in real time;
obtaining a current error value of the synthesized current value and a preset safe current value;
and obtaining the current frequency error value of the rope saw motor through the current error value.
In one embodiment, after the step of calculating the frequency value for output to the rope saw motor based on the frequency value of the rope saw motor at the previous time and the frequency error value, the method further comprises:
if the frequency value for outputting to the rope saw motor is greater than the preset upper limit frequency value, the preset upper limit frequency value is output to the rope saw motor, and the step of calculating the frequency value for outputting to the walking motor also replaces the frequency value for outputting to the rope saw motor with the preset upper limit frequency value.
In one embodiment, after the step of calculating the frequency value for output to the rope saw motor based on the frequency value of the rope saw motor at the previous time and the frequency error value, the method further comprises:
if the frequency value for outputting to the rope saw motor is smaller than the preset lower limit frequency value, the preset lower limit frequency value is output to the rope saw motor, and the step of calculating the frequency value for outputting to the walking motor is to replace the frequency value for outputting to the rope saw motor with the preset lower limit frequency value.
In one embodiment, the preset upper frequency limit value is a rated frequency value of the rope saw motor.
In one embodiment, the preset lower limit frequency value is 20-40% of the rated frequency value of the rope saw motor.
The rope saw control system comprises a rope saw motor, a first frequency converter, a walking motor and a second frequency converter;
the rope saw motor is used for providing power output for the rope saw to cut the stone;
the first frequency converter is electrically connected with the rope saw motor and used for obtaining a current frequency error value of the rope saw motor;
the first frequency converter is also used for obtaining the frequency value of the rope saw motor at the previous moment and calculating the frequency value used for being output to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value;
the first frequency converter is also used for outputting the frequency value of the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value used for outputting the frequency value to the rope saw motor and the frequency value of the rope saw motor at the previous moment;
the walking motor is used for providing power output for the walking of the rope saw;
the second frequency converter is electrically connected with the walking motor, is in communication connection with the first frequency converter, and is used for receiving the frequency value output by the first frequency converter and used for outputting to the walking motor so as to adjust the running frequency of the walking motor.
In one embodiment, the system further comprises: a first potentiometer and a second potentiometer;
the first potentiometer is connected with the first frequency converter and is used for receiving a rope saw speed control command and sending out a rope saw frequency conversion signal;
the second potentiometer is connected with the second frequency converter and is used for receiving the walking speed control instruction and outputting walking frequency conversion signals.
In one embodiment, the first frequency converter is also used for receiving the rope saw frequency conversion signal and controlling the rotation speed of the rope saw motor; the second frequency converter is also used for receiving the walking frequency conversion signal and controlling the rotation speed of the walking motor.
In one embodiment, the first potentiometer and the second potentiometer are both non-contact potentiometers.
According to the control method and the control system of the rope saw, the frequency error value of the rope saw motor and the frequency of the rope saw motor at the previous moment are obtained to adjust the frequency output to the rope saw motor and the walking motor, so that the synchronous adjustment of the frequency of the rope saw motor and the frequency of the walking motor is realized, the precision is improved, a PLC (programmable logic controller) system is not required to be additionally installed, the cost is reduced, and the anti-interference performance is improved. Furthermore, the purpose of quickly adjusting and maximally protecting the wire saw is realized by predicting the frequency of the wire saw motor and the walking motor at the next moment.
Drawings
FIG. 1 is a flow diagram of a method of controlling a wire saw in one embodiment;
FIG. 2 is a flowchart illustrating a specific method of step S100 in FIG. 1;
FIG. 3 is a flow chart of a method of controlling a rope saw in yet another embodiment;
FIG. 4 is a flow chart of a method of controlling a wire saw in another embodiment;
FIG. 5 is a block diagram of a control system of the rope saw in one embodiment;
fig. 6 is a block diagram of a control system of a rope saw in still another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Please refer to fig. 1, which is a flowchart illustrating a control method of a rope saw according to an embodiment. A jigsaw control method may include: steps S110 to S130.
Step S110, a current frequency error value of the rope saw motor is obtained.
The rope sawing machine is generally used for mining or dismantling buildings, and has the advantages of safety, reliability, high efficiency and the like compared with the traditional construction modes of forced breaking, drilling machine hole arrangement and the like. The rope saw is designed by utilizing the principle of rope saw wood breaking to cut brittle and hard materials. The general composition of a wire saw machine may include: the rope saw comprises a rope saw driving system, a flywheel, a guide wheel and a rope saw chain (made of diamond materials).
In one embodiment, the frequency error value may be calculated using a built-in PID regulator of the rope saw. In the actual calculation process, the synthesized current value in the two-phase coordinate system can be obtained by measuring the three-phase current value of the rope saw motor, and then the frequency error value can be further obtained by obtaining the current error value.
Referring to fig. 2, step S110 may include: s111 to S113.
And step S111, acquiring a synthesized current value of the three-phase current value of the rope saw motor under a two-phase coordinate system in real time.
In one embodiment, for obtaining the three-phase current of the rope saw motor in the three-phase static coordinate system, two phases of the three-phase stator current of the rope saw motor can be detected in real time through a rope saw frequency converter in the rope saw machine, and then the other phase current is calculated according to the condition that the sum of the three-phase current is zero. After the three-phase current value of the rope saw motor is obtained, the three-phase current value is converted into two-phase current under a two-phase static coordinate system through clark, and then the two-phase current under the two-phase coordinate system is synthesized into one current, namely the required synthesized current value. Illustratively, the acquisition process of the resultant current is explained in actual calculation. First, two phases Iu and Iw of three-phase stator currents of the wire saw motor are obtained, and the value of Iv is obtained according to the sum of the three-phase currents being zero, i.e., Iu + Iw + Iv being 0. Then three-phase current values Iu, Iw and Iv are transformed into two-phase current I under a two-phase static coordinate system through coordinate transformationα、IβThen according to Iα、IβObtaining the resultant current, i.e. I ═ Iα 2+Iβ 2)1/2I is the desired resultant current value.
Step S112, obtaining a current error value between the synthesized current value and a preset safe current value.
In one embodiment, the current error value may be obtained using a built-in PID regulator of the wire saw. Illustratively, Err represents the current error value, I1For a predetermined safety current value, Err ═ I1I, where the preset safe current value is related to the working conditions, it can be expressed, for example, as the hardness of the stone material and the specification of the wire saw chain, etc., it being understood that the safe current value can be set according to different working conditions.
And step S113, obtaining the current frequency error value of the rope saw motor through the current error value.
In one embodiment, obtaining the frequency error value from the current error value may be obtained using a PID regulator built into the rope saw device. Illustratively, p (t) is a frequency error value, and then the frequency error value p (t) is Kp [ Err + (. jqrdt)/TI + Td + derr/dt ], where Kp is a proportionality coefficient, TI is an integration time constant, and Td is a differentiation time constant.
And step S120, calculating a frequency value for outputting to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value.
In one embodiment, the frequency value of the wire saw motor may be obtained by two methods, the first: in the case of a rope saw device with a speed detection device (e.g. a photoelectric encoder), the detection can be performed directly by the speed detection device, the second: for the rope saw equipment without a speed detection device, the back electromotive force of the rope saw motor can be detected firstly, and then the frequency of the back electromotive force is obtained to be the required frequency of the rope saw motor. Exemplarily, F1Frequency value of the previous moment of the rope saw motor, F1For the frequency value to be output to the rope saw motor, there is F1＝F1，+P(t) And outputting the frequency value obtained by calculation to a rope saw motor.
Step S130, calculating a frequency value for outputting to the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value for outputting to the rope saw motor and the frequency value of the rope saw motor at the previous moment.
Specifically, the frequency value of the walking motor can be obtained by checking through the speed detection device. The device without the speed detection device can detect the back electromotive force of the walking motor firstly, and then the frequency of the back electromotive force is obtained to be the required frequency of the walking motor.
Exemplarily, F1Representing the frequency value for output to the motor of the rope saw, F1Representing the frequency value of the motor of the rope saw at the previous moment, F2Frequency value F representing the previous time of the traveling motor2A frequency value for output to the walking motor is represented. The calculation method for the frequency value output to the walking motor can be expressed as: f2＝F2，*F1/F1,. The frequency value of the walking motor calculated according to the formula is the frequency value to which the walking motor needs to be adjusted.
According to the embodiment, the frequency error value of the rope saw motor and the frequency of the rope saw motor at the previous moment are obtained to adjust the frequency output to the rope saw motor and the walking motor, so that the synchronous adjustment of the frequency of the rope saw motor and the frequency of the walking motor are realized, the precision is improved, a PLC (programmable logic controller) system is not required to be additionally installed, the cost is reduced, and the anti-interference performance is improved. Furthermore, the purpose of quickly adjusting and maximally protecting the wire saw is realized by predicting the frequency of the wire saw motor and the walking motor at the next moment.
Please refer to fig. 3, which is a flowchart illustrating a control method of a rope saw according to another embodiment. A jigsaw control method may include: steps S210 to S230.
It is understood that steps S210 to S220 are the same as steps S110 to S120 in the foregoing embodiment, and therefore, redundant description is omitted here. Step S230 is further described below.
Step S230, if the frequency value for outputting to the rope saw motor is greater than the preset upper limit frequency value, outputting the preset upper limit frequency value to the rope saw motor, and the step of calculating the frequency value for outputting to the walking motor also replaces the frequency value for outputting to the rope saw motor with the preset upper limit frequency value.
In one embodiment, the frequency value of the rope saw motor calculated in the previous embodiment is compared with a preset upper limit frequency value, and specifically, if the frequency value for outputting to the rope saw motor is greater than the preset upper limit frequency value, which indicates that the frequency error value is greater than zero, the preset upper limit frequency of the rope saw motor is used as the frequency value for outputting to the rope saw motor. The frequency error value is greater than zero, that is, the synthesized current value is smaller than the preset safe current value, at this time, it indicates that the rope saw motor is to be accelerated, and the frequency calculation formula of the rope saw motor can be expressed as: f1＝F1, + P (t). In order to ensure the safety of the wire saw, the running speed of the running motor is changed accordingly. The rope saw motor can output according to the preset upper limit frequency, wherein the frequency output of the walking motor can be obtained through the frequency value of the rope saw motor at the previous moment, the frequency value of the walking motor at the previous moment and the preset upper limit frequency of the rope saw motor, and the preset upper limit frequency is the rated frequency value of the rope saw motor. Exemplarily, FHLIndicating a predetermined upper limit frequency, F, of the motor of the wire saw1Representing the frequency value of the motor of the rope saw at the previous moment, F2Frequency value F representing the previous time of the traveling motor2A frequency value for output to the walking motor is represented. The calculation method of the frequency value of the walking motor can be expressed as: f2＝F2，*FHL/F1,. The frequency value of the walking motor calculated according to the formula is the frequency value to which the walking motor needs to be adjusted. Wherein, the frequency of rope saw motor and walking motor can be obtained through two kinds of methods, the first kind: in the case of a rope saw device with a speed detection device (e.g. a photoelectric encoder), the detection can be performed directly by the speed detection device, the second: for a wire saw apparatus without speed detection means,the back electromotive force of the rope saw motor and the walking motor can be detected firstly, and then the frequency of the back electromotive force is obtained to be the required frequency of the rope saw motor and the walking motor.
According to the embodiment, the frequency error value of the rope saw motor and the frequency of the rope saw motor at the previous moment are obtained to adjust the frequency output to the rope saw motor and the walking motor, so that the synchronous adjustment of the frequency of the rope saw motor and the frequency of the walking motor are realized, the precision is improved, a PLC (programmable logic controller) system is not required to be additionally installed, the cost is reduced, and the anti-interference performance is improved. Furthermore, the purpose of quickly adjusting and maximally protecting the wire saw is achieved by limiting the maximum output frequency of the wire saw motor, potential safety hazards caused by excessive output of the wire saw motor can be prevented, and adjustment is faster and quicker.
Please refer to fig. 4, which is a flowchart illustrating a control method of a rope saw according to another embodiment. A jigsaw control method may include: steps S310 to S330.
It is understood that steps S310 to S320 are the same as steps S110 to S120 in the foregoing embodiment, and therefore, redundant description is omitted here. Step S330 is further explained below.
Step S330, if the frequency value output to the rope saw motor is smaller than the preset lower limit frequency value, the preset lower limit frequency value is output to the rope saw motor, and the step of calculating the frequency value output to the walking motor is to replace the frequency value output to the rope saw motor with the preset lower limit frequency value.
In one embodiment, the frequency value of the rope saw motor calculated in the previous embodiment is compared with a preset lower limit frequency value, specifically, if the frequency value for outputting to the rope saw motor is smaller than the preset lower limit frequency value, it indicates that the current error value is smaller than zero, and at this time, the preset lower limit frequency of the rope saw motor is used as the frequency value to be output to the rope saw motor, so as to adjust the frequency value output to the walking motor. The current error value is less than zero, that is, the synthesized current value is greater than the preset safe current value, at this time, the speed reduction operation of the rope saw motor is about to be performedIn order to ensure the safety of the wire saw, the running speed of the running motor is changed accordingly. When the condition is met (the synthesized current value is larger than the preset safe current value), the rope saw motor can output at the next moment according to the preset lower limit frequency, wherein the frequency output of the walking motor can be obtained by the frequency value of the rope saw motor at the previous moment, the frequency value of the walking motor at the previous moment and the preset lower limit frequency of the rope saw motor, and the preset lower limit frequency is 20% -40% of the rated frequency value of the rope saw motor. Exemplarily, FLLIndicating a preset lower limit frequency, F, of the motor of the wire saw1Representing the frequency value of the motor of the rope saw at the previous moment, F2Frequency value F representing the previous time of the traveling motor2Indicating the frequency value to be output to the travel motor. The calculation method of the frequency value to be output to the travel motor can be expressed as: f2＝F2，*FLL/F1,. The frequency value of the walking motor calculated according to the formula is the frequency value to be output to the walking motor. Wherein, the frequency of rope saw motor and walking motor can be obtained through two kinds of methods, the first kind: in the case of a rope saw device with a speed detection device (e.g. a photoelectric encoder), the detection can be performed directly by the speed detection device, the second: for the rope saw equipment without a speed detection device, the back electromotive force of the rope saw motor and the walking motor can be detected firstly, and then the frequency of the back electromotive force is obtained to be the required frequency of the rope saw motor and the walking motor. According to the frequency to be output to the walking motor calculated in the step, the step of calculating the frequency value of the rope saw motor at the next moment in advance is omitted, and the frequency value is directly adjusted according to the preset frequency value, so that the adjustment is quicker and quicker.
According to the embodiment, the frequency error value of the rope saw motor and the frequency of the rope saw motor at the previous moment are obtained to adjust the frequency output to the rope saw motor and the walking motor, so that the synchronous adjustment of the frequency of the rope saw motor and the frequency of the walking motor are realized, the precision is improved, a PLC (programmable logic controller) system is not required to be additionally installed, the cost is reduced, and the anti-interference performance is improved. Furthermore, the purpose of quickly adjusting and maximally protecting the wire saw is achieved by limiting the lowest output frequency of the wire saw motor, potential safety hazards caused by excessively low output of the wire saw motor can be prevented, and adjustment is faster and quicker.
Please refer to fig. 5, which is a block diagram of a control system of the rope saw according to an embodiment. A rope saw control system may include a rope saw motor 10, a first frequency converter 20, a travel motor 30, and a second frequency converter 40. The rope saw motor 10 is electrically connected with the first frequency converter 20, the walking motor 30 is electrically connected with the second frequency converter 40, and the first frequency converter 20 is in communication connection with the second frequency converter 40, that is, the first frequency converter 20 can transmit data to the second frequency converter 40. The rope saw motor 10 is used for providing power output for the rope saw to cut the stone. The first frequency converter 20 is configured to obtain a current frequency error value of the rope saw motor, the first frequency converter 20 is further configured to obtain a frequency value of the rope saw motor at a previous time, and calculate a frequency value to be output to the rope saw motor according to the frequency value of the rope saw motor at the previous time and the frequency error value, and the first frequency converter 20 is further configured to calculate a frequency value to be output to the walking motor according to the frequency value of the walking motor at the previous time, the frequency value to be output to the rope saw motor, and the frequency value of the rope saw motor at the previous time. The walking motor 30 is used for providing power output for the walking of the rope saw. The second frequency converter 40 is used for receiving the frequency value output by the first frequency converter and used for outputting to the walking motor so as to adjust the running frequency of the walking motor. It is understood that any frequency converter capable of executing the embodiment of the rope saw control method can be used as the system, and when the frequency converter is selected, the frequency converter can be changed according to actual operation requirements, load size, working environment and the like, and the invention is not limited to this.
In the embodiment, the first frequency converter and the second frequency converter are adopted to respectively control the frequency of the rope saw motor and the frequency of the walking motor, so that the safety control of the rope saw for cutting stone is realized; furthermore, the frequency of the rope saw motor and the walking motor at the next moment is estimated through the first frequency converter, the obtained frequency of the walking motor is sent to the second frequency converter, and the frequency of the walking motor at the next moment is controlled through the second frequency converter, so that the aims of not additionally installing a PLC (programmable logic controller) system, reducing the cost, and simultaneously protecting the rope saw machine with stronger interference resistance and maximization are fulfilled.
Please refer to fig. 6, which is a block diagram of a control system of the rope saw according to an embodiment. A rope saw control system may include a rope saw motor 10, a first frequency converter 20, a travel motor 30, a second frequency converter 40, a first potentiometer 50, and a second potentiometer 60. The rope saw motor 10 is electrically connected with the first frequency converter 20, the walking motor 30 is electrically connected with the second frequency converter 40, and the first frequency converter 20 is in communication connection with the second frequency converter 40, that is, the first frequency converter 20 can transmit data to the second frequency converter 40, the first potentiometer 50 is electrically connected with the first frequency converter 20, and the second potentiometer 60 is electrically connected with the second frequency converter 40. The rope saw motor 10 is used for providing power output for the rope saw to cut the stone. The first frequency converter 20 is configured to obtain a current frequency error value of the rope saw motor, the first frequency converter 20 is further configured to obtain a frequency value of the rope saw motor at a previous time, and calculate a frequency value to be output to the rope saw motor according to the frequency value of the rope saw motor at the previous time and the frequency error value, and the first frequency converter 20 is further configured to calculate a frequency value to be output to the walking motor according to the frequency value of the walking motor at the previous time, the frequency value to be output to the rope saw motor, and the frequency value of the rope saw motor at the previous time. The walking motor 30 is used for providing power output for the walking of the rope saw. The second frequency converter 40 is used for receiving the frequency value output by the first frequency converter and used for outputting to the walking motor so as to adjust the running frequency of the walking motor. The first potentiometer 50 is used for receiving a rope saw speed control command and sending out a rope saw frequency conversion signal, the rope saw speed command can be input by an external person, and the first potentiometer 50 can adopt a non-contact potentiometer, such as a photoelectric potentiometer or a magnetic sensitive potentiometer, and the like. The second potentiometer 60 is configured to receive a walking speed control command and output a walking frequency conversion signal, the walking speed control command may be input by an external person, and the second potentiometer 60 may be a non-contact potentiometer, for example, a photoelectric potentiometer or a magnetic-sensing potentiometer. It will be appreciated that the arrangement of the first potentiometer 50 and the second potentiometer 60 allows the operator to control the speed of the cord saw motor and the travel motor individually and manually. The first frequency converter 20 is also used for receiving the rope saw frequency conversion signal and controlling the rotation speed of the rope saw motor 10 according to the rope saw frequency conversion signal. The second frequency converter 40 is also used for receiving the walking frequency conversion signal and controlling the rotation speed of the walking motor 30 according to the walking frequency conversion signal. It is understood that any frequency converter capable of executing the embodiment of the rope saw control method can be used as the system, and when the frequency converter is selected, the frequency converter can be changed according to actual operation requirements, load size, working environment and the like, and the invention is not limited to this.
In the embodiment, the first frequency converter and the second frequency converter are adopted to respectively control the frequency of the rope saw motor and the frequency of the walking motor, so that the safety control of the rope saw for cutting stone is realized; further, through the frequency of the first frequency converter pre-estimate the next moment rope saw motor and the walking motor and send the frequency of the walking motor who obtains for the second frequency converter, the mode of controlling the frequency of the walking motor next moment through the second frequency converter realizes need not to install the PLC system in addition, the cost is reduced, simultaneously the anti-interference is stronger and the mesh of maximize protection rope saw, and further, through installing the potentiometer additional to first frequency converter and second frequency converter, can satisfy the requirement that operating personnel need manual control rope saw motor and walking motor speed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A rope saw control method is used for realizing the safety control of the rope saw for cutting stone materials, and is characterized by comprising the following steps:
obtaining a current frequency error value of a rope saw motor; wherein, the step of obtaining the current frequency error value of the rope saw motor comprises the following steps:
acquiring a synthesized current value of a three-phase current value of the rope saw motor under a two-phase coordinate system in real time;
obtaining a current error value of the synthesized current value and a preset safe current value;
obtaining a current frequency error value of the rope saw motor through the current error value;
calculating a frequency value for outputting to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value;
and calculating the frequency value for outputting to the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value for outputting to the rope saw motor and the frequency value of the rope saw motor at the previous moment.
2. The method of claim 1, wherein the step of calculating a frequency value for output to the rope saw motor based on the frequency value of the rope saw motor at a previous time and the frequency error value is further followed by:
if the frequency value for outputting to the rope saw motor is greater than the preset upper limit frequency value, the preset upper limit frequency value is output to the rope saw motor, and the step of calculating the frequency value for outputting to the walking motor also replaces the frequency value for outputting to the rope saw motor with the preset upper limit frequency value.
3. The method of claim 1, wherein the step of calculating a frequency value for output to the rope saw motor based on the frequency value of the rope saw motor at a previous time and the frequency error value is further followed by:
if the frequency value for outputting to the rope saw motor is smaller than the preset lower limit frequency value, the preset lower limit frequency value is output to the rope saw motor, and the step of calculating the frequency value for outputting to the walking motor is to replace the frequency value for outputting to the rope saw motor with the preset lower limit frequency value.
4. The rope saw control method according to claim 2, wherein the predetermined upper frequency limit value is a rated frequency value of the rope saw motor.
5. The method of claim 3, wherein the predetermined lower frequency limit is 20% to 40% of the rated frequency of the rope saw motor.
6. A rope saw control system is characterized by comprising a rope saw motor, a first frequency converter, a walking motor and a second frequency converter;
the rope saw motor is used for providing power output for the rope saw to cut the stone;
the first frequency converter is electrically connected with the rope saw motor and used for obtaining a current frequency error value of the rope saw motor; wherein, the step of obtaining the current frequency error value of the rope saw motor comprises the following steps:
acquiring a synthesized current value of a three-phase current value of the rope saw motor under a two-phase coordinate system in real time;
obtaining a current error value of the synthesized current value and a preset safe current value;
obtaining a current frequency error value of the rope saw motor through the current error value;
the first frequency converter is also used for obtaining the frequency value of the rope saw motor at the previous moment and calculating the frequency value used for being output to the rope saw motor according to the frequency value of the rope saw motor at the previous moment and the frequency error value;
the first frequency converter is also used for calculating a frequency value for outputting to the walking motor according to the frequency value of the walking motor at the previous moment, the frequency value for outputting to the rope saw motor and the frequency value of the rope saw motor at the previous moment;
the walking motor is used for providing power output for the walking of the rope saw;
the second frequency converter is electrically connected with the walking motor, is in communication connection with the first frequency converter, and is used for receiving the frequency value output by the first frequency converter and used for outputting to the walking motor so as to adjust the running frequency of the walking motor.
7. The rope saw control system of claim 6, further comprising: a first potentiometer and a second potentiometer;
the first potentiometer is connected with the first frequency converter and is used for receiving a rope saw speed control command and sending out a rope saw frequency conversion signal;
the second potentiometer is connected with the second frequency converter and is used for receiving the walking speed control instruction and outputting walking frequency conversion signals.
8. The rope saw control system of claim 7, wherein the first frequency converter is further configured to receive the rope saw frequency conversion signal and control a rotational speed of the rope saw motor based on the rope saw frequency conversion signal; the second frequency converter is also used for receiving the walking frequency conversion signal and controlling the rotation speed of the walking motor according to the walking frequency conversion signal.
9. The rope saw control system of claim 7, wherein the first and second potentiometers are non-contact potentiometers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810224883.2A CN108612531B (en) | 2018-03-19 | 2018-03-19 | Control method and system for wire saw |
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| CN201810224883.2A CN108612531B (en) | 2018-03-19 | 2018-03-19 | Control method and system for wire saw |
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| CN108612531B true CN108612531B (en) | 2020-03-20 |
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| CN101859122B (en) * | 2010-06-12 | 2012-05-23 | 泉州华大超硬工具科技有限公司 | Automatic electrical control system for wire saw machine |
| CN203066978U (en) * | 2012-12-18 | 2013-07-17 | 华侨大学 | Mine quarrying string bead wire saw control system |
| CN203045995U (en) * | 2013-01-23 | 2013-07-10 | 泉州市利器金刚石工具有限公司 | Electrical system of rope saw machine |
| CN203726642U (en) * | 2014-01-02 | 2014-07-23 | 福建省霞浦县众源机械有限公司 | Electrical traveling control system of wire saw |
| CN104233910A (en) * | 2014-10-09 | 2014-12-24 | 徐州徐工铁路装备有限公司 | Cable saw cutting control system and cable saw cutting device |
| KR20160128115A (en) * | 2015-04-28 | 2016-11-07 | 웅진에너지 주식회사 | Wire saw apparatus |
| CN105019907A (en) * | 2015-07-28 | 2015-11-04 | 泉州华大超硬工具科技有限公司 | Electrical control system for modular digital hydraulic wire saw |
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