CN104438361A - 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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- CN104438361A CN104438361A CN201410641791.6A CN201410641791A CN104438361A CN 104438361 A CN104438361 A CN 104438361A CN 201410641791 A CN201410641791 A CN 201410641791A CN 104438361 A CN104438361 A CN 104438361A
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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 present invention relates to Main Drive of Rolling Mill Mechatronic Systems field tests, particularly devise a kind of milling train alternating current generator main transmission dynamic loading test method.
Background technology
Milling train is one of the key equipment of metal material of manufacturing a finished product, the high capacity motor driving milling train to run generally has the feature of high voltage, big current, Large Copacity, high pulling torque, high overload, good and bad and the operating condition of reliability on milling train of main transmission performance indications for Motor Control has direct impact, also most important to Rolling Production.Due to the process that the operation of rolling has high requirements to continuity degree, operating rate, security, need before actual Rolling Production to motor and electrically and machine driven system carry out complete test.Otherwise easily in actual production process, there is waste product waste material, even cause serious associate device accident.Therefore, to those skilled in the art complete Main Drive of Rolling Mill formally produce before dynamic conditioning and test be very important.
Traditional Main Drive of Rolling Mill load test is separately carried out electric control system and mechanical driving part, and most of occasion is by the restriction of field condition, high-power machinery running part cannot load on greatly before the rolling of band material, can only reference device manufacture to dispatch from the factory parameter.Be test the static state of motor, dynamic property in driving control system to the test of electric part, wherein dynamic load process is carried out after motor excitation link test link completes optimization, the two close cycles test method usually adopted.Namely first test and optimize torque current ring, test also optimal speed control loop on this basis.
The Main Drive of Rolling Mill load test method that prior art uses, when carrying out torque current load test to main driving motor, for the response condition of true reflection system in the true operation of rolling of trying one's best, usually 1.5 ~ 2.0 times that are loaded into motor load current value are needed, although now control system has ensured there is no the excitatory output of motor, but for prevent loaded analog rolling torque current motor remanent magnetism or induction magnetic flux effect under produce uncontrollable moment of torsion, motor rotor part is needed to be fixed, fastening means and and fixation power generally just rely on artificial experience to complete, in order to ensure the safety of the equipment such as roll, also need the mechanical drive shaft of motor and roll to remove.Because integral device is huger, such process of the test preparation is complicated and there is certain risk.
Summary of the invention
For solving the problems of the technologies described above, the present invention provides a kind of milling train to exchange main transmission load test method especially, the method is used for any Main Drive of Rolling Mill Mechatronic Systems performance test that up-down rollers individual motor drives, do not need in test process to implement to remove to the intermediate propeller shaft between main motor and roll, do not need to be fixed main motor rotor portion when implementing the test of large torque current, thus whole test efficiency can be improved yet; And adopt the test carried out of the method, the power consumption in test process compares conventional method also to be had and significantly reduces, and has significant energy-saving effect.The method is conducive to safer, to complete mill main drive system accurately and rapidly electromechanical properties test.
A kind of milling train provided by the invention exchanges main transmission dynamic load method of testing, specifically comprises the following steps:
Step 1: control centre and roll gap adjustment device, top roll speed regulator, top roll current regulator, lower roll speed regulator and lower roll current regulator connect, and parameters, comprises the speed reference V of topping roll motor
set1, the speed reference V of bottom roll motor
set2, after control centre sends test enable signals, first issue top and bottom rolls Roll-gap position and pressure adjusting instruction to roll gap adjustment device, i.e. control centre's setting gap values between rollers X
1=0, setting rolling force value X
2export for analog rolling power, complete upper and lower roll gap and reset and realize being pressed against, and make to produce between top and bottom rolls and be similar to normal roll-force of producing;
Step 2: after completing the adjustment of top and bottom rolls position, starts motor base speed and tests below,
2.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
1, n
1span be 0<n
1≤ n
j, n
jfor motor base speed, n
1for the following speed setting value of motor base speed;
2.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
2.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 2.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.5 return step 2.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.6 return step 2.2 again, and resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, to reach the dynamic response index meeting Rolling Production load needs, treat that all indexs reach technological requirement value rear motor base speed and tested below;
Step 3: start motor base speed and test above,
3.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
2, n
2span be n
j<n
2≤ n
max, n
maxfor the restriction of motor maximum speed, n
2for the above speed setting value of motor base speed;
3.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
3.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 3.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.5 return step 3.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.6 return step 3.2 again, and resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, treat that all indexs reach technological requirement value rear motor base speed and tested above to reach the dynamic response index meeting Rolling Production load needs.
Equipment involved by said method comprises milling train up-down rollers two and overlaps main drive motor, the electric gear unit of motor and mechanical drive shaft, rolling mill roll, rolling mill screwdown adjusting device.Wherein,
The output of described Electrified Transmission unit is connected with corresponding main drive motor terminals respectively, and Electrified Transmission unit provides electric energy for motor; The excitation part that described Electrified Transmission unit comprises the control section for the adjustment of main transmission Properties Control, the power section for Technics of Power Electronic Conversion and controls for motor exciting curent; Described control section is general digital drive controller, by the adjustment of amendment setup parameter by the speed governing characteristic of controlled motor, torque current characteristic etc., and can change the working method of electrical drive control system unit; Described power section adopts general three-phase unsteady flow mode, according to the output signal of control unit, voltage, AC power that frequency is certain can be transformed to voltage, the power supply of changeable frequency outputs to described main drive motor.The described excitation part exciting curent completed needed for motor running exports and controls.
Described milling train top and bottom rolls is connected respectively by the output of respective mechanical drive shaft with respective main drive motor rotor portion, and roll is the general name of backing roll and working roll herein;
Described rolling mill screwdown device is connected with rolling mill roll with hydraulic cylinder by the Electro-pressing screw of rolling equipment body, described rolling mill screwdown device comprises hydraulic pressing part and position thereof, pressure control unit, has the effect regulating up-down rollers roll gap and relative pressure.
The power section of the electric gear unit of motor of described up-down rollers adopts direct current supply bus mode altogether, or adopts completely independently rectifier, and is the four-quadrant fairing with energy feedback function for the rectifier that Main Drive of Rolling Mill is powered.
The control section of the electric gear unit of motor of described up-down rollers is separate, and namely up-down rollers has respective digital drive controller; The inverter of the electric gear unit power section of motor of described up-down rollers independently, and is controlled by the digital drive controller of respective control section.
Because described up-down rollers Mechanical & electrical Transmission Control system is completely independent, the amplitude of the alternating current voltage component that respective electric control unit exports and frequency are adjustable, and the moment of torsion of corresponding respective motor rotor output shaft end independently can be provided by electric control unit.After the throw-on pressure relying on rolling mill screwdown device to provide when top and bottom rolls forces together, frictional force between top and bottom rolls makes to there is not relative motion between roll, thus also do not have relative motion between up-down rollers driven motor machine rotor, the actual speed of up-down rollers milling train electric control unit is strictly consistent.
When carrying out milling train and exchanging main transmission dynamic loading test, the Aided Machine of described milling train, hydraulic pressure, lubricating system are ready, the control section of milling train up-down rollers motor, power section, excitation part have possessed preliminary service condition, and all devices keeps the duty before normal production.Putting before this, up-down rollers roll gap is reset by Electro-pressing part and relevant position control unit by described rolling mill screwdown device, namely seamless between up-down rollers; And then the pressure control unit of described rolling mill screwdown device realizes being pressed against to up-down rollers by hydraulic pressing part, be similar to normal roll-force of producing even if produce between up-down rollers.
Now described up-down rollers milling train control section is all set in normal speed control mode, forward and reverse torque amplitude limit of top roll is all set as torque current value to be tested, namely electronicly set same current limit with generating state, only symbol is had any different.All be set as by the torque amplitude limit of lower roll exceeding certain amplitude (as 5%) than torque current value to be tested, be similarly electronic and set same current limit with generating state, only symbol is had any different.The given same linear velocity of up-down rollers is run, described rolling main drive motor takes respective roll to by mechanical drive shaft and runs, because up-down rollers roll surface has same line speed, up-down rollers motor running now only needs the rolling frictional resistance overcoming drive system rotating part, torque is now no-load torque, up-down rollers Electrified Transmission unit Driving Torque electric current within 10% of normal rating torque current, and all operates in forward motoring condition.
Preferably, when by the electromotor velocity of described lower roller mill control section setting be increased to be greater than top roll electromotor velocity setting time, now by the effect that lower roll Electrified Transmission unit speed controls, the enough torque currents of output make lower roll motor be increased to the speed of service of setting by the power section of the electric gear unit of lower roll motor, due to the effect of throw-on pressure between top and bottom rolls, relative motion cannot be produced between top and bottom rolls roll surface, therefore the speed of following lower roll motor raises by top roll motor, but by the effect that top roll Electrified Transmission unit speed controls, speed control is saturated very soon, namely the power section of the electric gear unit of top roll motor will export set torque current amplitude limit value at once, but because this amplitude limit value is less than the amplitude limit value of lower roll setting, now top roll is in generating state, and lower roll is in motoring condition.The force of sliding friction that the resistance that now up-down rollers operates is mainly roll surface provides, equal and opposite in direction, and direction is contrary, and both reach the torque current amplitude limit value of control section setting simultaneously.Be different torque current value by the torque amplitude limit in amendment up-down rollers milling train control section, and be progressively loaded into rolling torque capacity current value needed for motor, can complete whole experiment work.
On the basis completing above-mentioned main transmission load test, the present invention more provides power savings advantages during the method test, owing to carrying out in above-mentioned test process, because top roll motor is generating state, lower roll motor is motoring condition, and electronic institute's energy requirement of lower roll motor is substantially suitable to the ability on dc bus with top roll motor electrification feedback, the power section of milling train Electrified Transmission unit significantly improves in the efficiency of grid side, and power consumption during test is compared traditional approach and reduced.
The invention has the beneficial effects as follows, owing to adopting technique scheme, Main Drive of Rolling Mill on-line loaded test method provided by the present invention and circuit, relative to traditional load mode, do not need to dismantle the large-scale jackshaft of motor and roll and return to fill, do not need to carry out machinery to the rotor portion of tested motor to fix, significantly can reduce the complexity tested yet.Meanwhile, because up-down rollers energy when the method is tested can be exchanged by common DC bus or common ac bus mode, the total electric energy consumed in test process is made repeatedly to be also effectively controlled.
Accompanying drawing explanation
Fig. 1 is the Main Drive of Rolling Mill Mechatronic Systems schematic diagram that up-down rollers drives.
Fig. 2 is mair motor Electrified Transmission cell power part line schematic diagram 1.
Fig. 3 is mair motor Electrified Transmission cell power part line schematic diagram 2.
Fig. 4 is dynamic loading test controlling unit schematic diagram.
Fig. 5 is Main Drive of Rolling Mill dynamic loading test method flow diagram.
Fig. 6 is embodiment load test curve map.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiment of the invention scheme is described further.
As shown in Figure 1, the Main Drive of Rolling Mill Mechatronic Systems that up-down rollers drives comprises up-down rollers main transmission alternating current generator and Electrified Transmission unit 1,2 thereof; Milling train top and bottom rolls 3,4; Milling train up-down rollers roll-separating mechanism 5; And the universal-joint spindle 6, power transmission shaft 7, shaft coupling 8,9 etc. for connecting roll and motor.
Top and bottom rolls is generally made up of working roll and backing roll respectively, i.e. four-high mill, and backing roll and working roll are directly pressed against and contact, and it plays the effect of the strength and stiffness strengthening working roll.No matter be that mair motor drives working roll or drives backing roll, this method is all effective, is also applicable to the two-roller mill only having working roll.
Described top and bottom rolls 3,4 is connected with the rotor mechanical output shaft of main driving motor respectively by universal-joint spindle, power transmission shaft etc., to realize the mechanical energy of mair motor to roll transmission.Top and bottom rolls is driven separately by two motors respectively, and the speed sync of roll is ensured by electrical equipment;
Described milling train up-down rollers roll-separating mechanism 5 also claims rolling mill screwdown adjusting device, generally comprise hydraulic pressing part and position thereof, pressure control unit, for adjusting relative position and the relative pressure of top and bottom rolls, the rolling roll gap and draught pressure that need in the operation of rolling are provided.
The connection of described main transmission alternating current generator and corresponding Electrified Transmission unit is see Fig. 2 or Fig. 3.M1, M2 are respectively the motor driving top and bottom rolls; I1, I2 are respectively the inverter of up-down rollers feeding electric motors, are controlled by respective electrical drive control system part.Figure 2 shows that up-down rollers motor uses same rectifier R1, adopt direct current supply bus mode altogether, under this kind of mode, namely the upper roller motor feedback electric energy in test process can be used for lower roll motoring condition and uses on dc bus PDC; Figure 3 shows that up-down rollers motor adopts rectifier R1, R2 independently, under this kind of mode, the upper roller motor feedback electric energy in test process needs to return to power supply side by top roll rectifier could be used for the use of lower roll motoring condition.
The action schematic diagram of main driving motor control section and roll gap regulation system in dynamic loading test shown in Fig. 4.Primarily of compositions such as control centre 10, roll gap regulation control device 11, upper roller motor electrical drive control system part 12 and lower roller motor electrical drive control system parts 13.Described control centre 10 is responsible for providing required control setting value in load test process, comprises fixed value of roller slit X
1, draught pressure setting value X
2, top roll motor speed setting value Y
1, top roll motor torque current limit setting value Y
2, lower roll motor speed setting value Z
1, lower roll motor torque current limit setting value Z
2.
Described control centre 10 issues fixed value of roller slit X
1with draught pressure setting value X
2output in roll gap regulation control device 11, there is in roll gap setter position control module and pressure control module, detect by milling train the actual position signal 111 that returns and actual draught pressure signal 112 completes closed-loop control.
Described control centre 10 issues top roll motor speed setting value Y respectively
1, top roll motor torque current limit setting value Y
2to speed regulator and the current regulator of upper roller motor electrical drive control system part 12.The actual motor speed signal 121 that returns is detected and actual motor current signal 122 completes closed-loop control by motor side.
Described control centre 10 issues lower roll motor speed setting value Z respectively
1, top roll motor torque current limit setting value Z
2to speed regulator and the current regulator of upper roller motor electrical drive control system part 13.The actual motor speed signal 131 that returns is detected and actual motor current signal 132 completes closed-loop control by motor side.
Fig. 5 is Main Drive of Rolling Mill dynamic loading test method flow diagram, and the method for carrying out Main Drive of Rolling Mill Mechatronic Systems dynamic loading test with above-mentioned control device with reference to Benturi is as follows:
Step 1: control centre and roll gap adjustment device, top roll speed regulator, top roll current regulator, lower roll speed regulator and lower roll current regulator connect, and parameters, comprises the speed reference V of topping roll motor
set1, the speed reference V of bottom roll motor
set2, after control centre sends test enable signals, first issue top and bottom rolls Roll-gap position and pressure adjusting instruction to roll gap adjustment device, i.e. control centre's setting gap values between rollers X
1=0, setting rolling force value X
2export for analog rolling power, complete upper and lower roll gap and reset and realize being pressed against, and make to produce between top and bottom rolls and be similar to normal roll-force of producing;
Step 2: after completing the adjustment of top and bottom rolls position, starts motor base speed and tests below,
2.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
1, n
1span be 0<n
1≤ n
j, n
jfor motor base speed, n
1for the following speed setting value of motor base speed;
2.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
2.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 2.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.5 return step 2.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.6 return step 2.2 again, and resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, to reach the dynamic response index meeting Rolling Production load needs, treat that all indexs reach technological requirement value rear motor base speed and tested below;
Step 3: start motor base speed and test above,
3.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
2, n
2span be n
j<n
2≤ n
max, n
maxfor the restriction of motor maximum speed, n
2for the above speed setting value of motor base speed;
3.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
3.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 3.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.5 return step 3.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.6 return step 3.2 again, and resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, to reach the dynamic response index meeting Rolling Production load needs, treat that all indexs reach technological requirement value rear motor base speed and tested above.
Embodiment:
Said method is used to carry out load test to the roughing mill main transmission Mechatronic Systems that a up-down rollers drives.This milling train up-down rollers motor is identical, and power is 5000kW, and rated current is 990A, maximum speed 60 revs/min, base speed 30 revs/min; Electrified Transmission unit adopts the common DC bus structure shown in Fig. 2, and namely respective inverter is separate, rectifier output-parallel.According to order described in method respectively to below base speed and the fast above different torque currents responses of base carried out corresponding load test, can completion system parameter adjustment fast by the response curve recorded.Compared with the method for traditional dismounting power transmission shaft, fixed electrical machinery rotor, the experimentation time reduces greatly, and efficiency is improved; Rotate because rotor is the same with normal rolling in test process, also do not exist due to the improper danger causing rotor turns of bed knife adjustment; In test process, the electronic and feedback energy of up-down rollers is sentenced at dc bus and is exchanged, and the electric energy taking from electrical network reduces more than 70% than conventional method.Figure 6 shows that one group of typical curve when 10 revs/min, low regime test rated torque current and 50 revs/min, high velocity test 50% rated torque current.
By above milling train dynamic loading test method describe can find out, use the method time, motor and roll keep normal connection status, without the need to do dismounting power transmission shaft, shaft coupling, without the need to rotor part is carried out machinery fix etc. hard work; The complete analog rolling state of test process that the method is carried out, is namely set as normal draught pressure, low speed segment that main driving motor is set as normal rolling and high regime is run, motor torque electric current is test under dynamic rotary between roll; The method is adopted to carry out in load test process, because lower roll machine operation is at motoring condition, and top roll machine operation is at generating state, no matter be in dc bus side or in power supply side, two parts electric energy has complementary effect, and the more traditional single motor load mode of the electric energy loss in test process significantly reduces.
Claims (1)
1. milling train exchanges a main transmission Mechatronic Systems load test method of testing, it is characterized in that, specifically comprises the following steps:
Step 1: control centre and roll gap adjustment device, top roll speed regulator, top roll current regulator, lower roll speed regulator and lower roll current regulator connect, and parameters, comprises the speed reference V of topping roll motor
set1, the speed reference V of bottom roll motor
set2, after control centre sends test enable signals, first issue top and bottom rolls Roll-gap position and pressure adjusting instruction to roll gap adjustment device, i.e. control centre's setting gap values between rollers X
1=0, setting rolling force value X
2export for analog rolling power, complete upper and lower roll gap and reset and realize being pressed against, and make to produce between top and bottom rolls and be similar to normal roll-force of producing;
Step 2: after completing the adjustment of top and bottom rolls position, starts motor base speed and tests below,
2.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
1, n
1span be 0<n
1≤ n
j, n
jfor motor base speed, n
1for the following speed setting value of motor base speed;
2.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
2.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 2.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.5 return step 2.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
2.6. again return step 2.2, resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, keeps other parameter constant, repeats above process, makes the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmaxtest the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, to reach the dynamic response index meeting Rolling Production load needs, treat that all indexs reach technological requirement value rear motor base speed and tested below;
Step 3: start motor base speed and test above,
3.1 heart setting top roll motor speed value Y in the controlling
1with lower roll motor speed value Z
1, wherein, Y
1=V
set1, Z
1=V
set2, V
set1=V
set2=n
2, n
2span be n
j<n
2≤ n
max, n
maxfor the restriction of motor maximum speed, n
2for the above speed setting value of motor base speed;
3.2 setting top roll motor speed value Y
1with lower roll motor speed value Z
1forward and reverse torque current amplitude limit of top roll is Y
2, opposing torque current limit is-Y
2, top roll torque current value is I
set1; The forward torque current limit of setting lower roll is Z
2, opposing torque current limit-Z
2, lower roll torque current value is I
set2, Y
2=-Y
2=I
set2, Z
2=-Z
2=I
set1, I
set2=0.55I
e, I
set1=0.5I
e, I
efor the current value that motor is specified;
3.3 complete above setting after, confirm that machinery, hydraulic pressure, lubricating system are ready, milling train control section, power section, excitation part keep normal operating conditions, start milling train operation; Due to speed sync, do not have active force between top and bottom rolls, milling train runs and is in zero load Light Condition, and no-load torque electric current is 5 ~ 10%I
e;
After the above state of 3.4 confirmation, in downward roller motor speed setting value, increase a step signal V
set3, V
set3=5%V
set2, under the effect of the roll surface frictional force produced due to draught pressure between top and bottom rolls, still will keep speed sync between top and bottom rolls, lower roll is in motoring condition; Because the Speed Setting of top roll does not change, can all the time lower than actual speed, therefore top roll works in generating state, until the torque current of control centre's detection top and bottom rolls motor reaches the 0.5I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.5 return step 3.2, and resetting top roll torque current value is I
set1=I
e, lower roll torque current value is I
set2=1.05I
e, keep other parameter constant, repeat above process, make the milling train electric current of top and bottom rolls motor reach the 1.0I of setting simultaneously
e, test the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator;
3.6 return step 3.2 again, and resetting top roll torque current value is I
set1=I
tmax, lower roll torque current value is I
set1=1.05I
tmax, I
tmaxtorque capacity electric current needed for mill main drive system, keeps other parameter constant, repeats above process, makes the milling train electric current of top and bottom rolls motor reach the 1.05I of setting simultaneously
tmaxtest the speed in this process and torque current change curve, be used for adjusting the current regulator of Main Drive of Rolling Mill Mechatronic Systems and the parameter of speed regulator, to reach the dynamic response index meeting Rolling Production load needs, treat that all indexs reach technological requirement value rear motor base speed and tested above.
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| CN201410641791.6A CN104438361B (en) | 2014-11-13 | 2014-11-13 | Load experimenting and testing method for rolling mill alternating current main transmission electromechanical system |
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| CN107377636A (en) * | 2017-08-11 | 2017-11-24 | 张家港联峰钢铁研究所有限公司 | A kind of abnormal current tracking method of rolling line production |
| CN107470370A (en) * | 2017-08-11 | 2017-12-15 | 马鞍山钢铁股份有限公司 | A kind of control method for preventing shaped steel blooming mill main drive motor from persistently rolling card |
| CN107520258A (en) * | 2016-06-22 | 2017-12-29 | 上海梅山钢铁股份有限公司 | The method of testing of cold rolling mill motor losses moment coefficient |
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| CN107470370B (en) * | 2017-08-11 | 2019-10-01 | 马鞍山钢铁股份有限公司 | A kind of control method for preventing fashioned iron blooming mill main drive motor from persistently rolling card |
| CN107377631A (en) * | 2017-08-21 | 2017-11-24 | 马鞍山钢铁股份有限公司 | A kind of control system and method that prevent shape rolling mill depth from rolling card |
| CN107377631B (en) * | 2017-08-21 | 2019-07-30 | 马鞍山钢铁股份有限公司 | A kind of control system and method for preventing shape rolling mill depth from rolling card |
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| CN104438361B (en) | 2017-01-18 |
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