CN104438361B - Load experimenting and testing method for rolling mill alternating current main transmission electromechanical system - Google Patents
Load experimenting and testing method for rolling mill alternating current main transmission electromechanical system Download PDFInfo
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Abstract
The invention relates to the field of testing of rolling mill main transmission electromechanical systems, in particular to a load experimenting and testing method for a rolling mill alternating current main transmission electromechanical system. Devices involved in the method comprise two main drive motors for an upper roller and a lower roller of a rolling mill, a motor electric transmission unit, a mechanical transmission shaft, rolling mill rollers and a rolling mill press-down adjusting device. According to the method, an upper roller electromechanical transmission control system and a lower roller electromechanical transmission control system are completely independent, on the premise that forced-contract of an upper roller and a lower roller is reset, the current limit value of positive and negative rotation torque of the upper roller and the lower roller is set, the motor speed of the control part of the upper roller and the lower roller is set, the lower roller is made in a power driven state under the action of friction force on the surface of the rollers, the upper roller is made in a power generating state, the torque limit value is modified gradually to reach the maximum torque current value needed by rolling, and the testing work of the whole system can be completed.
Description
Technical Field
The invention relates to the field of testing of a main transmission electromechanical system of a rolling mill, in particular to a dynamic loading test method for main transmission of an alternating current motor of the rolling mill.
Background
The rolling mill is one of key equipment for producing finished metal materials, a large motor for driving the rolling mill to operate generally has the characteristics of high voltage, large current, large capacity, large torque and high overload, and the performance indexes and reliability of a main transmission system for controlling the motor have direct influence on the operating condition of the rolling mill and are also important for rolling production. Because the rolling process has high requirements on continuity, operating rate and safety, the motor and the electric and mechanical transmission systems thereof need to be completely tested before actual rolling production. Otherwise, waste materials and waste materials are easy to be generated in the actual production process, and even serious related equipment accidents are caused. Therefore, it is very important for those skilled in the art to perform dynamic adjustment and test before the main transmission of the rolling mill is formally produced.
The traditional main transmission loading test of the rolling mill is carried out on an electrical control part and a mechanical transmission part separately, most occasions are limited by field conditions, the high-power mechanical transmission part cannot be loaded with large load before strip rolling, and only equipment manufacturing delivery parameters can be referred. The test of the electric part is to test the static and dynamic performances of the motor in a transmission control system, wherein the dynamic loading process is carried out after the optimization of the motor excitation link test link, and a double closed loop test method is generally adopted. I.e. the torque current loop is first tested and optimized, on the basis of which the speed control loop is tested and optimized.
In the main transmission loading test method of the rolling mill used in the prior art, when a torque current loading test is carried out on a main transmission motor, in order to reflect the response condition of the system in the real rolling process as really as possible, the load is usually required to be 1.5-2.0 times of the rated current value of a motor, although the control system ensures that no motor excitation output exists at the moment, in order to prevent loaded simulation rolling torque current from generating uncontrollable torque under the action of residual magnetism or induction flux of the motor, a rotor part of the motor needs to be fixed, and the fastening mode and the fixed acting force are generally finished only by the experience of people; in order to ensure the safety of the equipment such as the roller, the motor and the mechanical transmission shaft of the roller are also required to be detached. Due to the fact that the whole device is large, preparation work of the test process is complex and certain risk exists.
Disclosure of Invention
In order to solve the technical problems, the invention particularly provides a rolling mill alternating current main transmission loading test method which is used for testing the performance of any rolling mill main transmission electromechanical system driven by independent motors of an upper roller and a lower roller, and does not need to dismantle an intermediate transmission shaft between a main motor and a roller in the test process or fix a rotor part of the main motor in the large-torque current test, so that the whole test efficiency can be improved; moreover, the test performed by the method has the advantages that the power consumption in the test process is greatly reduced compared with that of the traditional method, and the obvious energy-saving effect is achieved. The method is beneficial to completing the electromechanical performance test of the main transmission system of the rolling mill more safely, accurately and quickly.
The invention provides a dynamic loading test method for alternating current main transmission of a rolling mill, which specifically comprises the following steps:
step 1: the control center is connected with the roll gap regulator, the upper roll speed regulator, the upper roll current regulator, the lower roll speed regulator and the lower roll current regulator, and parameters including the speed reference value V of the upper roll motor are setset1Reference value V of speed of lower roll motorset2After the control center sends out a test starting signal, firstly, the roll gap position and the pressure adjusting instruction of the upper and the lower rolls are sent to the roll gap regulator, namely, the control center sets the roll gap value X1Set rolling force value X as 02In order to simulate the rolling force and output, the upper and lower roll gaps are reset and pressed, and the rolling force similar to the normal production is generated between the upper and lower rolls;
step 2: after the position adjustment of the upper roller and the lower roller is completed, the test below the base speed of the motor is started,
2.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1＝Vset1、Z1＝Vset2、Vset1＝Vset2＝n1，n1Has a value range of 0<n1≤nj，njIs the motor base speed, n1The speed is set value below the basic speed of the motor;
2.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1Forward and reverse torque current limit of upper rollWidth is Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset2，Y2＝-Y2＝Iset2，Z2＝-Z2＝Iset1，Iset2＝0.55Ie，Iset1＝0.5Ie，IeA current value rated for the motor;
2.3 after the setting is finished, confirming that a mechanical system, a hydraulic system and a lubricating system are ready, keeping a rolling mill control part, a power part and an excitation part in normal working states, and starting the rolling mill to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
2.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Vset3＝5％Vset2Under the action of the roller surface friction force generated between the upper roller and the lower roller due to the rolling pressure, the upper roller and the lower roller still keep the speed synchronization, and the lower roller is in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.5 returning to the step 2.2, resetting the upper roll torque current value to be Iset1＝IeThe value of the torque current of the lower roll is Iset2＝1.05IeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.6 returning to the step 2.2 again, resetting the upper roll torque current value to be Iset1＝ITmaxThe value of the torque current of the lower roll is Iset1＝1.05ITmaxKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.05I simultaneouslyTmax，ITmaxTesting a speed and torque current change curve in the process for the maximum torque current required by the main transmission system of the rolling mill, adjusting parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill to achieve a dynamic response index meeting the requirement of rolling production load, and completing the test below the base speed of the motor after all indexes reach the process required value;
and step 3: the test above the base speed of the motor is started,
3.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1＝Vset1、Z1＝Vset2、Vset1＝Vset2＝n2，n2Has a value range of nj<n2≤nmax，nmaxFor maximum motor speed limitation, n2The speed is set value above the basic speed of the motor;
3.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1The forward and reverse torque current amplitude limit of the upper roller is Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset2，Y2＝-Y2＝Iset2，Z2＝-Z2＝Iset1，Iset2＝0.55Ie，Iset1＝0.5Ie，IeA current value rated for the motor;
3.3 after the above setting is completed, the readiness of the mechanical, hydraulic and lubricating system is confirmed, and the rolling millThe control part, the power part and the excitation part are kept in normal working states, and the rolling mill is started to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
3.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Vset3＝5％Vset2Under the action of the roller surface friction force generated between the upper roller and the lower roller due to the rolling pressure, the upper roller and the lower roller still keep the speed synchronization, and the lower roller is in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
3.5 returning to the step 3.2, resetting the upper roll torque current value to be Iset1＝IeThe value of the torque current of the lower roll is Iset2＝1.05IeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
3.6 returning to the step 3.2 again, resetting the upper roll torque current value to be Iset1＝ITmaxThe value of the torque current of the lower roll is Iset1＝1.05ITmaxKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.05I simultaneouslyTmax，ITmaxTesting the variation curve of speed and torque current in the process for the maximum torque current required by the main drive system of the rolling mill, and adjusting the parameters of a current regulator and a speed regulator of the main drive electromechanical system of the rolling mill to achieve the dynamic response index meeting the rolling production load requirementAnd after all indexes reach the technological required values, the test is finished when the basic speed of the motor is higher than the basic speed.
The equipment related by the method comprises two sets of main drive motors for upper and lower rollers of the rolling mill, an electric drive unit of the motors, a mechanical drive shaft, a rolling mill roller and a rolling mill pressing adjusting device. Wherein,
the output of the electric transmission unit is respectively connected with the wiring terminals of the corresponding main transmission motors, and the electric transmission unit provides electric energy for the motors; the electric transmission unit comprises a control part for controlling and adjusting the main transmission performance, a power part for power electronic conversion and an excitation part for controlling the excitation current of the motor; the control part is a universal digital transmission controller, can adjust the speed regulation characteristic, the torque current characteristic and the like of the controlled motor by modifying set parameters, and can change the working mode of the electric transmission control unit; the power part adopts a general three-phase current transformation mode, and can transform an alternating current power supply with certain voltage and frequency into a power supply with variable voltage and frequency according to an output signal of the control unit and output the power supply to the main transmission motor. And the excitation part completes the output control of excitation current required by the operation of the motor.
The upper and lower rollers of the rolling mill are respectively connected with the output ends of the rotor parts of the main drive motors through respective mechanical drive shafts, and the rollers are the general names of the back-up roll and the working roll;
the rolling mill screwdown is connected with a rolling mill roller through an electric screwdown screw and a hydraulic cylinder of a rolling equipment body, and the rolling mill screwdown comprises a hydraulic screwdown part, a position of the hydraulic screwdown part and a pressure control unit and has the function of adjusting the roll gaps of the upper and lower rolls and the relative pressure.
The power part of the electric transmission units of the motors of the upper and lower rollers adopts a common direct current power supply bus mode or adopts a completely independent rectifier, and the rectifier for the main transmission power supply of the rolling mill is a four-quadrant rectifying device with an energy feedback function.
The control parts of the electric transmission units of the motors of the upper and lower rollers are mutually independent, namely the upper and lower rollers are provided with respective digital transmission controllers; the inverters of the power parts of the electric transmission units of the motors of the upper and lower rollers are respectively independent and controlled by digital transmission controllers of respective control parts.
Because the upper and lower roller electromechanical transmission control systems are completely independent, the amplitude and the frequency of alternating current voltage components output by respective electric control units are adjustable, and the torque of the corresponding output shaft end of the rotor of each motor can be independently provided by the electric control units. When the upper and lower rollers are pressed together by the pressing force provided by the rolling mill screwdown device, the friction force between the upper and lower rollers makes no relative movement between the rollers, so that there is no relative movement between the rotors of the upper and lower roller transmission motors, and the actual speeds of the upper and lower rolling mill electric control units are strictly kept consistent.
When the AC main transmission dynamic loading test of the rolling mill is carried out, the auxiliary machinery, the hydraulic pressure and the lubricating system of the rolling mill are ready, the control part, the power part and the excitation part of the upper and lower roller motors of the rolling mill have initial operation conditions, and all equipment are kept in a working state before normal production. On the premise, the rolling mill screwdown device clears the roll gaps of the upper and lower rolls through an electric screwdown part, namely a corresponding position control unit, namely no gap exists between the upper and lower rolls; further, the pressure control unit of the rolling mill screw-down device presses the upper and lower rolls by the hydraulic pressing portion, even if a rolling force similar to that in normal production is generated between the upper and lower rolls.
At the moment, the control parts of the upper and lower rolling mills are set in a normal speed control mode, and forward and reverse torque amplitude limits of the upper roll are set to be torque current values to be tested, namely, the current amplitude limits of the electric rolling mills and the power generation state are set to be the same, and only the signs are different. The torque amplitude limits of the lower roller are set to be higher than the torque current value to be tested by a certain amplitude (such as 5%), the same current amplitude limit values are set for the electric and power generation states, and only the signs are different. The upper and lower rollers are set to operate at the same linear speed, the rolling main transmission motor is driven to respective roller to operate through the mechanical transmission shaft, the upper and lower roller motor operates only by overcoming the rolling friction resistance of the rotating part of the driving system due to the fact that the upper and lower roller surfaces have the same linear speed, the torque at the moment is no-load torque, and the output torque current of the upper and lower roller electric transmission units is within 10% of the normal rated torque current and operates in a forward electric state.
Preferably, when the motor speed setting of the lower roll mill control section is increased to be greater than the upper roll motor speed setting, under the action of the speed control of the lower roll electric transmission unit, the power part of the lower roll electric transmission unit outputs enough torque current to enable the lower roll electric motor to be increased to the set running speed, because of the action of the pressure between the upper and lower rollers, the roller surfaces of the upper and lower rollers can not generate relative movement, therefore, the upper roll motor will follow the speed rise of the lower roll motor, but under the action of the speed control of the upper roll electric transmission unit, the speed controller is quickly saturated, i.e. the power part of the upper roll motor electric drive unit will immediately output the set torque current limit value, however, the amplitude limiting value is smaller than the amplitude limiting value set by the lower roller, so that the upper roller is in a power generation state, and the lower roller is in a power generation state. At the moment, the running resistance of the upper and lower rollers is mainly provided for the sliding friction force of the roller surface, the magnitude is equal, the direction is opposite, and the two rollers simultaneously reach the torque current limiting value set by the control part. The whole test work can be completed by modifying the torque amplitude limit in the control part of the upper and lower rolling mills into different torque current values and gradually loading the torque current values to the maximum rolling torque current value required by the motor.
On the basis of completing the main transmission loading test, the invention further provides the energy-saving advantage of the method during the test, because the upper roller motor is in a power generation state and the lower roller motor is in an electric state in the test process, the energy required by the electric driving of the lower roller motor is basically equivalent to the capacity of the upper roller motor for generating power and feeding back the power to the direct current bus, the energy efficiency of the power part of the electric transmission unit of the rolling mill on the side of a power grid is obviously improved, and the electric energy consumption during the test is reduced compared with the traditional mode.
The rolling mill main transmission online loading test method and the circuit have the advantages that due to the adoption of the technical scheme, compared with the traditional loading mode, the motor and the large intermediate shaft of the roller do not need to be disassembled and reassembled, the rotor part of the tested motor does not need to be mechanically fixed, and the test complexity can be greatly reduced. Meanwhile, the energy of the upper roller and the lower roller during the test can be exchanged in a common direct current bus or common alternating current bus mode, so that the total electric energy consumed in the repeated test process is effectively controlled.
Drawings
FIG. 1 is a schematic diagram of a rolling mill main drive electromechanical system driven by upper and lower rolls.
Fig. 2 is a schematic wiring diagram 1 of the power section of the main machine electric drive unit.
FIG. 3 is a schematic power section wiring diagram of the main electromechanical transmission unit 2.
Fig. 4 is a schematic diagram of a dynamic loading test control link.
FIG. 5 is a flowchart of a dynamic loading test method for main transmission of a rolling mill.
FIG. 6 is a graph of an example loading test.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in figure 1, the rolling mill main transmission electromechanical system driven by the upper and lower rolls comprises an upper and lower roll main transmission alternating current motor and electric transmission units 1 and 2 thereof; upper and lower rolls 3, 4 of the rolling mill; a roll gap adjusting device 5 for an upper roll and a lower roll of the rolling mill; and a universal coupling shaft 6, a transmission shaft 7, couplings 8 and 9 and the like for connecting the roller and the motor.
The upper and lower rolls are generally composed of a work roll and a backup roll, i.e., a four-high rolling mill, which are in direct contact with the work roll, and which act to enhance the strength and rigidity of the work roll. The method is effective whether the main motor drives the working roll or the supporting roll, and is also suitable for a two-roll mill with only working rolls.
The upper and lower rollers 3 and 4 are respectively connected with a rotor mechanical output shaft of a main transmission motor through a universal coupling shaft, a transmission shaft and the like so as to transmit the mechanical energy of the main motor to the rollers. The upper and lower rollers are separately driven by two motors, and the speed synchronization of the rollers is ensured by electrical equipment;
the roll gap adjusting device 5 for the upper and lower rolls of the rolling mill, also called a rolling mill pressing adjusting device, generally comprises a hydraulic pressing part, a position and pressure control unit thereof, and is used for adjusting the relative position and relative pressure of the upper and lower rolls, so as to provide the roll gap and rolling pressure required in the rolling process.
The connection of the main drive ac motor to the respective electric drive unit is shown in fig. 2 or fig. 3. M1 and M2 are motors for driving the upper and lower rollers respectively; i1 and I2 are inverters for supplying power to the upper roller motor and the lower roller motor respectively and are controlled by respective electric transmission control parts. FIG. 2 shows that the upper and lower roller motors use the same rectifier R1 and adopt a common DC power supply bus mode, in which the feedback electric energy of the upper roller motor in the test process can be used in the lower roller motor state on the DC bus PDC; fig. 3 shows that the upper and lower roller motors adopt respective independent rectifiers R1 and R2, in this way, the feedback electric energy of the upper roller motor in the test process needs to be returned to the power supply side through the upper roller rectifier to be used in the lower roller electric state.
FIG. 4 is a schematic diagram of the operation of the main drive motor control part and the roll gap adjusting system in the dynamic loading test. The device mainly comprises a control center 10, a roll gap adjusting control device 11, an upper roll motor electric transmission control part 12, a lower roll motor electric transmission control part 13 and the like. The control center 10 is responsible for providing the required control set values, packages, during the loading testSetting value X of draw-off roll gap1Rolling pressure set value X2Upper roller motor speed set value Y1Torque current amplitude limiting set value Y of upper roll motor2Lower roll motor speed set value Z1Lower roller motor torque current amplitude limiting set value Z2。
The control center 10 issues a roll gap set value X1With rolling pressure set value X2The output is sent to a roll gap adjusting control device 11, a roll gap adjuster is provided with a position control module and a pressure control module, and closed-loop control is completed by detecting a returned actual position signal 111 and an actual rolling pressure signal 112 by a rolling mill.
The control center 10 respectively sends the speed set values Y of the upper roller motors1Torque current amplitude limiting set value Y of upper roll motor2Speed regulator and current regulator to the upper roll motor electrical drive control section 12. Closed loop control is accomplished by motor side sensing the returned actual motor speed signal 121 and the actual motor current signal 122.
The control center 10 respectively issues lower roll motor speed set values Z1Torque current amplitude limiting set value Z of upper roll motor2Speed regulator and current regulator to the upper roll motor electrical drive control section 13. Closed loop control is accomplished by motor side sensing the returned actual motor speed signal 131 and the actual motor current signal 132.
Fig. 5 is a flowchart of a dynamic loading test method for the main transmission of the rolling mill, and the method for performing the dynamic loading test on the electromechanical system of the main transmission of the rolling mill by using the control device with reference to the flowchart is as follows:
step 1: the control center is connected with the roll gap regulator, the upper roll speed regulator, the upper roll current regulator, the lower roll speed regulator and the lower roll current regulator, and parameters including the speed reference value V of the upper roll motor are setset1Reference value V of speed of lower roll motorset2After the control center sends out a test starting signal, firstly, the roll gap position and the pressure adjusting instruction of the upper and the lower rolls are sent to the roll gap adjuster, namelyControl center set roll gap value X1Set rolling force value X as 02In order to simulate the rolling force and output, the upper and lower roll gaps are reset and pressed, and the rolling force similar to the normal production is generated between the upper and lower rolls;
step 2: after the position adjustment of the upper roller and the lower roller is completed, the test below the base speed of the motor is started,
2.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1＝Vset1、Z1＝Vset2、Vset1＝Vset2＝n1，n1Has a value range of 0<n1≤nj，njIs the motor base speed, n1The speed is set value below the basic speed of the motor;
2.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1The forward and reverse torque current amplitude limit of the upper roller is Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset2，Y2＝-Y2＝Iset2，Z2＝-Z2＝Iset1，Iset2＝0.55Ie，Iset1＝0.5Ie，IeA current value rated for the motor;
2.3 after the setting is finished, confirming that a mechanical system, a hydraulic system and a lubricating system are ready, keeping a rolling mill control part, a power part and an excitation part in normal working states, and starting the rolling mill to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
2.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Vset3＝5％Vset2Between upper and lower rolls due to rollingUnder the action of the friction force of the roller surface generated by the pressure, the upper roller and the lower roller still keep the speed synchronization, and the lower roller is in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.5 returning to the step 2.2, resetting the upper roll torque current value to be Iset1＝IeThe value of the torque current of the lower roll is Iset2＝1.05IeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.6 returning to the step 2.2 again, resetting the upper roll torque current value to be Iset1＝ITmaxThe value of the torque current of the lower roll is Iset1＝1.05ITmaxKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.05I simultaneouslyTmax，ITmaxTesting a speed and torque current change curve in the process for the maximum torque current required by the main transmission system of the rolling mill, adjusting parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill to achieve a dynamic response index meeting the requirement of rolling production load, and completing the test below the base speed of the motor after all indexes reach the process required value;
and step 3: the test above the base speed of the motor is started,
3.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1＝Vset1、Z1＝Vset2、Vset1＝Vset2＝n2，n2Has a value range of nj<n2≤nmax，nmaxFor maximum motor speed limitation, n2The speed is set value above the basic speed of the motor;
3.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1The forward and reverse torque current amplitude limit of the upper roller is Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset2，Y2＝-Y2＝Iset2，Z2＝-Z2＝Iset1，Iset2＝0.55Ie，Iset1＝0.5Ie，IeA current value rated for the motor;
3.3 after the setting is finished, confirming that a mechanical system, a hydraulic system and a lubricating system are ready, keeping a rolling mill control part, a power part and an excitation part in normal working states, and starting the rolling mill to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
3.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Vset3＝5％Vset2Under the action of the roller surface friction force generated between the upper roller and the lower roller due to the rolling pressure, the upper roller and the lower roller still keep the speed synchronization, and the lower roller is in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
3.5 returning to the step 3.2, resetting the upper roll torque current value to be Iset1＝IeThe value of the torque current of the lower roll is Iset2＝1.05IeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
3.6 returning to the step 3.2 again, resetting the upper roll torque current value to be Iset1＝ITmaxThe value of the torque current of the lower roll is Iset1＝1.05ITmaxKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.05I simultaneouslyTmax，ITmaxThe method is characterized in that a speed and torque current change curve in the process is tested for the maximum torque current required by a main transmission system of the rolling mill, parameters of a current regulator and a speed regulator of the main transmission electromechanical system of the rolling mill are adjusted to achieve a dynamic response index meeting the requirement of rolling production load, and the test is completed when all indexes reach a process requirement value and the motor base speed is higher than the motor base speed.
Example (b):
the method is used for carrying out loading test on the main transmission electromechanical system of the roughing mill driven by the upper roller and the lower roller. The upper and lower roll motors of the rolling mill are the same, the power is 5000kW, the rated current is 990A, the maximum rotating speed is 60 revolutions per minute, and the basic speed is 30 revolutions per minute; the electric drive units employ a common dc bus configuration as shown in fig. 2, i.e. the respective inverters are independent of each other and the rectifier outputs are connected in parallel. And respectively carrying out corresponding loading tests on different torque current responses below the basic speed and above the basic speed according to the sequence of the method, and quickly finishing system parameter adjustment through the measured response curve. Compared with the traditional method for dismantling the transmission shaft and fixing the motor rotor, the experimental process time is greatly reduced, and the efficiency is improved; because the rotor rotates as normal rolling in the test process, the danger of rotor rotation caused by improper adjustment of the fixing force does not exist; in the test process, the electric energy and the feedback energy of the upper roller and the lower roller are exchanged at the direct current bus, and the electric energy taken from the power grid is reduced by more than 70 percent compared with the traditional method. Fig. 6 shows a set of typical curves for a 10 rpm test rated torque current in the low speed region and a 50% rated torque current in the high speed region at 50 rpm.
According to the description of the dynamic loading test method of the rolling mill, when the method is used, the motor and the roller can be kept in a normal connection state, and heavy work such as dismantling of a transmission shaft and a coupling, mechanical fixing of a rotor part of the motor and the like is not needed; the test process carried out by the method completely simulates the rolling state, namely, the rolling pressure is set to be normal between the rollers, the main transmission motor is set to be operated at a low-speed section and a high-speed section of normal rolling, and the motor torque current is tested under dynamic rotation; in the loading test process by adopting the method, because the lower roller motor works in an electric state and the upper roller motor works in a power generation state, the two parts of electric energy have complementary effects no matter at the direct current bus side or at the power supply side, and the electric energy loss in the test process is greatly reduced compared with the traditional single motor loading mode.
Claims (1)
1. A loading test method for an alternating current main transmission electromechanical system of a rolling mill is characterized by comprising the following steps:
step 1: the control center is connected with the roll gap regulator, the upper roll speed regulator, the upper roll current regulator, the lower roll speed regulator and the lower roll current regulator, and parameters including the speed reference value V of the upper roll motor are setset1Reference value V of speed of lower roll motorset2After the control center sends out a test starting signal, firstly, the roll gap position and the pressure adjusting instruction of the upper and the lower rolls are sent to the roll gap adjustmentDevices, i.e. control centres setting the roll gap value X1=0, rolling force value X is set2In order to simulate the rolling force and output, the upper and lower roll gaps are reset and pressed, and the rolling force similar to the normal production is generated between the upper and lower rolls;
step 2: after the position adjustment of the upper roller and the lower roller is completed, the test below the base speed of the motor is started,
2.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1= Ｖset1、Ｚ1=Ｖset2、Ｖset1= Vset2=n1，n1Has a value range of 0 < n1≤nj，njIs the motor base speed, n1The speed is set value below the basic speed of the motor;
2.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1Setting the forward torque current amplitude limit of the upper roller to Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset２Setting Y2＝ -Y2＝ Iset2，Z2＝ -Z2＝ Iset1，Iset2＝ 0.55Ie， Iset1＝ 0.5Ie，，ＩeA current value rated for the motor;
2.3 after the setting is finished, confirming that a mechanical system, a hydraulic system and a lubricating system are ready, keeping a rolling mill control part, a power part and an excitation part in normal working states, and starting the rolling mill to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
2.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Ｖset3=5%Ｖset2The upper and lower rolls are driven by the friction force between the upper and lower rolls generated by the rolling pressureThe speed synchronization is still kept between the lower rollers, and the lower rollers are in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.5 returning to the step 2.2, resetting the upper roll torque current value to be Iset1=ＩeThe value of the torque current of the lower roll is Iset2=1.05ＩeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
2.6 returning to the step 2.2 again, resetting the upper roll torque current value to be Iset1=ＩTmaxThe value of the torque current of the lower roll is Iset2=1.05ＩTmax，ＩTmaxThe maximum torque current required by the main transmission system of the rolling mill is kept unchanged by other parameters, and the processes are repeated to ensure that the rolling mill currents of the upper and lower roll motors reach the set 1.05I simultaneouslyTmaxTesting the speed and torque current change curve in the process, adjusting parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill to achieve a dynamic response index meeting the requirement of rolling production load, and completing the test below the basic speed of the motor after all indexes reach the process required value;
and step 3: the test above the base speed of the motor is started,
3.1 setting the speed value Y of the upper roller motor in the control center1And motor speed value Z of lower roller1Wherein Y is1= Ｖset1、Ｚ1=Ｖset2、Ｖset1= Vset2=n2，n2Has a value range of nj＜n2≤nmax，nmaxFor maximum motor speed limitation, n2Is electricityA speed set value above the base speed;
3.2 set Up roller Motor speed value Y1And motor speed value Z of lower roller1Setting the forward torque current amplitude limit of the upper roller to Y2The reverse torque current is limited to-Y2The upper roll torque current value is Iset1(ii) a Setting the forward torque current limit of the lower roller to Z2Reverse torque current limiting-Z2The value of the torque current of the lower roll is Iset2Setting Y2＝ -Y2＝ Iset2，Z2＝ -Z2＝Iset1，Iset2＝ 0.55Ie， Iset1＝ 0.5Ie，，ＩeA current value rated for the motor;
3.3 after the setting is finished, confirming that a mechanical system, a hydraulic system and a lubricating system are ready, keeping a rolling mill control part, a power part and an excitation part in normal working states, and starting the rolling mill to run; because the speed is synchronous, no acting force exists between the upper roller and the lower roller, the rolling mill runs in a no-load state, and the no-load torque current is 5-10 percent Ie；
3.4 after confirming the above state, adding a step signal V to the set value of the speed of the lower roller motorset3，Ｖset3=5%Ｖset2Under the action of the roller surface friction force generated between the upper roller and the lower roller due to the rolling pressure, the upper roller and the lower roller still keep the speed synchronization, and the lower roller is in an electric state; the speed of the upper roller is set to be unchanged and is always lower than the actual speed, so that the upper roller works in a power generation state until the control center detects that the torque current of the upper roller motor and the lower roller motor simultaneously reach the set 0.5IeTesting the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill;
3.5 returning to the step 3.2, resetting the upper roll torque current value to be Iset1=ＩeThe value of the torque current of the lower roll is Iset2=1.05ＩeKeeping other parameters unchanged, repeating the above process to make the rolling mill current of the upper and lower roller motors reach the set 1.0I simultaneouslyeTesting ofThe speed and torque current change curve in the process is used for adjusting parameters of a current regulator and a speed regulator of a main drive electromechanical system of the rolling mill;
3.6 returning to the step 3.2 again, resetting the upper roll torque current value to be Iset1=ＩTmaxThe value of the torque current of the lower roll is Iset2=1.05ＩTmax，ITmaxThe maximum torque current required by the main transmission system of the rolling mill is kept unchanged by other parameters, and the processes are repeated to ensure that the rolling mill currents of the upper and lower roll motors reach the set 1.05I simultaneouslyTmaxAnd testing the speed and torque current change curve in the process to adjust the parameters of a current regulator and a speed regulator of a main transmission electromechanical system of the rolling mill so as to achieve a dynamic response index meeting the requirement of rolling production load, and completing the test of the motor base speed after all indexes reach the process required value.
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