CN104747461A - Control system for shape steel intensive pressure water cooling high-pressure variable-frequency water pumps - Google Patents
Control system for shape steel intensive pressure water cooling high-pressure variable-frequency water pumps Download PDFInfo
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Abstract
The invention relates to a control system for shape steel intensive pressure water cooling high-pressure variable-frequency water pumps. The control system comprises a water spraying valve state monitoring unit, a high-pressure variable-frequency water pump running number limiting unit, an automatic pump-stop pulse signal generation unit, a first high-pressure variable-frequency water pump start and stop control unit, a second high-pressure variable-frequency water pump start and stop control unit and a third high-pressure variable-frequency water pump start and stop control unit. The automatic pump-stop pulse signal generation unit sends output signals of itself to the first high-pressure variable-frequency water pump start and stop control unit. The water spraying valve state monitoring unit sends output signals of itself to the second high-pressure variable-frequency water pump start and stop control unit. The high-pressure variable-frequency water pump running number limiting unit sends output signals of itself to the third high-pressure variable-frequency water pump start and stop control unit. After the control system for the H shape steel intensive pressure water cooling high-pressure variable-frequency water pumps is adopted, the influences of severe pressure fluctuation of water passing high-pressure pipelines on the high-pressure water pumps, valves, filters and high-pressure water pipes can be eliminated, and a good energy conservation effect can be achieved.
Description
Technical field
The invention belongs to technical field of electrical automation control, belong to the production technology of the main furnace charge of blast furnace ironmaking, be specifically related to a kind of control system and method for shaped steel Water cooling high-voltage frequency-changing water pump.
Background technique
After Ma Gangsan steel rolls the large H profile steel finish rolling of head factory, Water cooling system put into operation in 2010, this system primarily of three high-pressure water pumps (560KW/ platform), backwash filter, wear water bypass valve, I section and II section of rolled piece Water cooling device (comprising cooling water nozzle, water spraying control valve, hand sluice valve, cooling water nozzle movable frame and cooling water catch tray etc.), rolled piece cooling water back flow water pump, back pool, elevator pump, high rate filter and absorbing well, absorption well etc. formed, this system architecture schematic diagram is illustrated in fig. 1 shown below.Consider that in the unit time, this system high pressure water pump confluent is much larger than the backwater amount of rolled piece cooling water back flow water pump, in order to prevent shaped steel cooling water excessive and avoid high-pressure water pump to be in for a long time building the pressure and overload from cooling water catch tray, this shaped steel Water cooling system must only be sprayed water when Water cooling device crosses steel, and wear water bypass valve without stopping spraying water and opening during steel, the cooling water that high-pressure water pump is exported directly gets back to system return pond.Based on this, the cooling water control mode of this system is: when Water cooling device crosses steel, and wear water bypass valve and close, water spraying control valve is opened, shaped steel Water cooling; After shaped steel afterbody departs from Water cooling device, system is opened and is worn water bypass valve, and closes water spraying control valve afterwards in 2 seconds (namely wearing the response time of water bypass valve), and Water cooling device stops water spray; When shaped steel head is close to Water cooling device, system opens water spraying control valve, and closes afterwards in 2 seconds (i.e. the response time of water spraying control valve) and wear water bypass valve, and Water cooling device is in water spray state.This above-mentioned cooling water control mode of wearing water system makes it there is many-sided defect: one, for existing shaped steel Water cooling system, in order to avoid shaped steel cooling water is excessive from cooling water catch tray, Water cooling device often crosses a root type steel, water spraying control valve and wear water bypass valve and need to carry out switching fast for twice, and make system high pressure water pump discharge pressure occur twice big ups and downs thus.Frequently there are big ups and downs just because of high-pressure water pump outlet pressure, make system water supply pipeline occur water hammer, and cause system pipeline frequently to occur the fault of snapping booster, piping filter inner chamber damages, high-pressure water pump impeller is broken and outlet valve valve plate comes off thus; They are two years old, wear regimen condition from Ma Gang great H profile steel production line all size H profile steel to add up, need the various description H profile steel of wearing water for great majority, the water flow demand that water worn by shaped steel is usually in one the water supplying pump water yield is less than normal and the state that two pumps water-supply quantity is bigger than normal.Due to this wear water system raw water service pump adopt be the high-pressure water pump that 10KV supply network is directly powered, the motion speed of high-pressure water pump is non-adjustable, like this, the number that the water yield adjustment that water worn by shaped steel can only be opened by controlled cooling model water nozzle realizes, in this case, when shaped steel wear the actual injection flow rate of water be less than or much smaller than water pump under rated load condition during available water flow, must cause high-pressure water pump during water worn by shaped steel, occur building the pressure and transshipping phenomenon, high-pressure water pump is caused to cavitate thus serious, its impeller average life was less than four months, and the working life of the pump housing also only left and right one year, its three, it is 4 minutes that usual Ma Gang great H profile steel Water cooling device average crosses steel rhythm, and its Shaped Steel is only 28 seconds by the average time of Water cooling device.It can thus be appreciated that in continuous flow procedure, wearing the water system high-pressure water pump overwhelming majority time is (i.e. the cooling water of high-pressure water pump output directly wear long water bypass valve get back to back pool) flogging a dead horse, and causes power consumption useless in a large number thus.
Summary of the invention
Wear the frequent water hammer of water system high service pipeline for shaped steel and high-pressure water pump frequently builds the pressure and overload problem, make the pipeline of system high pressure water supply part the present invention proposes a kind of controlling method of H profile steel Water cooling high-voltage frequency-changing water pump with equipment unit frequent breakage.
Technological scheme of the present invention is: a kind of control system of shaped steel Water cooling high-voltage frequency-changing water pump, comprise spray water valve condition monitoring unit, high-voltage frequency-changing water pump operation quantity limits unit, pump trip pulse signal generating unit, a high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit, described pump trip pulse signal generating unit, spray water valve condition monitoring unit, high-voltage frequency-changing water pump operation quantity limits unit and respective output signal is sent to respectively a high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit.Described spray water valve is two groups of spray water valve groups, when two groups of spray water valve groups any one group close time, spray water valve condition monitoring unit output state is ' 1 '.Described control system controls high-voltage frequency-changing water pump high-voltage frequency-changing water pump before water worn by shaped steel and automatically starts, and high-voltage frequency-changing water pump automatic stopping after water worn by shaped steel.Described pump trip pulse signal generating unit comprises forward position delay function block, rear along delay function block and front and back along authentication function block, the inspection signal of two hot metal detectors is sent to forward position delay function block and rear along delay function block respectively, and front and back to send respectively according to forward position delay function block and the rear input signal along delay function block along authentication function block and control pump trip pulse signal to high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit.Described forward position delay function block XJCLSC08 is used for preventing pump in automatic start-up course because hot metal detector T117 or hot metal detector T118 moment flase drop obtains and produces pump trip pulse signal; Described " after along time delay " function block XJCLSC09 is used for preventing pump from wearing in water process at rolled piece and produces pump trip pulse signal because hot metal detector T117 and hot metal detector T118 moment flase drop loses.Three high-voltage frequency-changing water pumps of this system adopt dual-purpose one standby or one by two standby control modes.A described high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit at high-voltage frequency-changing starting mode of pump Separation control, high-pressure water pump runs time-out automatically, spray water valve is not opened, the blockade of high-pressure water pump way selection, high-voltage frequency-changing water pump drive fault, in the manual termination of pumping of high-voltage frequency-changing water pump and high-voltage frequency-changing water pump pump trip any one input signal for ' 1 ' time, export termination of pumping instruction.A described high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit do not transfinite at high-voltage frequency-changing water pump input quantity, high-voltage frequency-changing water pump drops into and selects, when the ready and high-voltage frequency-changing water pump of high-voltage frequency-changing water pump transmission device manually boots signal or automatically activated signal is all ' 1 ', exports this pump operation instruction.The speed adjustment spray flow of the quantity that this system is opened by spray water valve and high-voltage frequency-changing water pump and irrigation pressure.This system started the speed of selected high-voltage frequency-changing water pump to setting before shaped steel enters Water cooling device, blocked high-voltage frequency-changing water pump and to power frequency variator, make high-voltage frequency-changing water pump be in vehicle stop state when shaped steel afterbody leaves Water cooling device.
The present invention has following good effect: after adopting the controlling method of this H profile steel Water cooling high-voltage frequency-changing water pump, not only can eliminate and wear the violent pressure surge of water high pressure line to the impact of high-pressure water pump, valve, filter and high-pressure water pipe, but also good energy-saving effect can be obtained.
Accompanying drawing explanation
Fig. 1 is the improved shaped steel Water cooling system construction drawing of the specific embodiment of the invention;
Fig. 2 is the control system block diagram of the shaped steel Water cooling high-voltage frequency-changing water pump of the specific embodiment of the invention;
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and working principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technological scheme.
By known to needing the statistics of the various descriptions of Water cooling after the finish rolling of Ma Gang great H profile steel, after large H profile steel finish rolling, the work rhythm of Water cooling device is usually between 4 ~ 6 minutes, its Shaped Steel is 28 seconds by the average time of Water cooling device, and Water cooling device treats that steel unflowing time is about 3.5 ~ 5.5 minutes.It can thus be appreciated that in the normal operation of rolling, the Water cooling device overwhelming majority time is in treat steel stop-spraying state.Based on this, 3 10KV high voltage converters can be adopted to power to shaped steel Water cooling system 3 high-pressure water pumps respectively, like this, the speed of selected high-voltage frequency-changing water pump to setting can be started before shaped steel enters Water cooling device at every turn, and block high-voltage frequency-changing water pump when shaped steel afterbody leaves Water cooling device and to power frequency variator, make high-voltage frequency-changing water pump be in free parking state.Within the starting time that usual H profile steel wears water high-voltage frequency-changing water pump can be controlled in 15 seconds.Wear water high-voltage frequency-changing water pump in view of H profile steel can realize only working when water worn by shaped steel, like this, the water spraying control valve of shaped steel Water cooling device can be in open mode in process of production all the time.In this case, the speed of the quantity opened by nozzle of the spray flow of shaped steel Water cooling device and irrigation pressure and high-voltage frequency-changing water pump adjusts.It can thus be appreciated that, after water high-pressure water pump employing inverter supply worn by shaped steel, not only avoid and wear water hammer that water high service pipeline produces because of pressure big ups and downs and there is good energy-saving effect, but also be convenient to the finely regulating that shaped steel wears water flow and pressure, reach best shaped steel Water cooling effect with this.Problem is the start and stop how controlling shaped steel Water cooling water pump according to the rolling rhythm of type steel production line timely and accurately.For this reason, we devise a kind of control program (or controlling method) of shaped steel Water cooling high-voltage frequency-changing water pump independently, and its control program structural drawing is illustrated in fig. 2 shown below.
In upper Fig. 2, NCM is " numeric ratio comparatively " function block, and as X1 > X2, QU is ' 1 ', and as X1=X2, QE is ' 1 ', and as X1 < X2, QL is ' 1 '; RSR is " rest-set flip-flop that reset terminal R is preferential " function block, when S be ' 1 ', R is ' 0 ', Q is ' 1 ', QN is ' 0 ', when S is ' 1 ', when R is ' 1 ', Q is ' 0 ', QN is ' 1 ', when S is ' 0 ', when R is ' 0 ', Q and QN keeps ortho states, when S is ' 0 ', when R is ' 1 ', Q is ' 0 ' QN is ' 1 '; ETE is " front and back are along setting " function block, and when input end I becomes ' 1 ' by ' 0 ', QP end only exports the direct impulse that length is 1 cycle period, and under all the other states, QP end remains ' 0 ' state.When input end I becomes ' 0 ' by ' 1 ', QN end only exports the direct impulse that length is 1 cycle period, and under all the other states, QN end remains ' 0 ' state; MFP is " pulse oscillator " function block, and when input end I becomes ' 1 ' by ' 0 ', output 1 time span is the direct impulse of T by Q end, and during Q end exports direct impulse, the change of state of input end I holds output state no longer to have an impact to Q; PDE is " forward position time delay " function block; PDF is " after along time delay " function block; OR is disjunction gate; AND is " with door "; NOT is " not gate ".Design and the control thought of this shaped steel Water cooling high-voltage frequency-changing water pump control program are as follows:
(1) this control program formed primarily of six control units, i.e. function block XJCLSC01 ~ XJCLSC04 forms Water cooling system spray water valve condition monitoring unit; Function block XJCLSC05 and XJCLSC06 forms Water cooling system high pressure variable frequency pump and runs quantity restriction unit; Function block XJCLSC07 ~ XJCLSC12 forms Water cooling system pump trip pulse signal generating unit; Function block XJCLSC13 ~ XJCLSC27, XJCLSC28 ~ XJCLSC42 and XJCLSC43 ~ XJCLSC57 forms Water cooling system high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit respectively.
(2) in order to there is the overload under the state of building the pressure after preventing high-voltage frequency-changing starting mode of pump, Water cooling system spray water valve condition monitoring unit is provided with in this shaped steel Water cooling high-voltage frequency-changing water pump control program, and using the operation disable condition one of of the output (i.e. the output of function block XJCLSC04) state (or signal) of this unit as each high-voltage frequency-changing water pump, like this, when I section, Water cooling device or II section of spray water valve are in closed condition, the output state (i.e. the output state of function block XJCLSC04) of this spray water valve condition monitoring unit is ' 1 ', make high-voltage frequency-changing water pump No starting to be launched thus and make the high-voltage frequency-changing water pump run enter the free parking state of transmission blockade immediately.
(3) under automated manner, in order to reduce backwater amount and the energy saving of shaped steel water spray, self-stopping working method after water worn by startup shaped steel automatically before water worn by this Water cooling system high pressure variable frequency pump employing shaped steel.Usually entering last passes state to the time that shaped steel is nipped needed for finishing mill from universal roughing mill group is 48 seconds, and the starting time of wearing water system high-voltage frequency-changing water pump is approximately 15 seconds, so the state signal that universal roughing mill group is entered last passes by this shaped steel Water cooling high-voltage frequency-changing water pump control program wears the automatically activated signal of high-voltage frequency-changing water pump before water as shaped steel.And when shaped steel afterbody is through after shaped steel Water cooling device, the pump trip signal of high-voltage frequency-changing water pump is then produced by two hot metal detectors (being called for short heat inspection) (T117 and T118) after Water cooling device, but it is larger to consider that the pump trip signal of high-voltage frequency-changing water pump is necessary for the water smoke after pulse signal and Water cooling device, so, in order to obtain the pulse signal of high-voltage frequency-changing water pump pump trip and prevent heat from detecting existing error signal, pump trip pulse signal generating unit is provided with in this shaped steel Water cooling high-voltage frequency-changing water pump control program.In this unit, prevent pump in automatic start-up course because heat inspection T117 or T118 moment flase drop obtains by " forward position time delay " function block XJCLSC08 and produce pump trip pulse signal; Prevent pump to wear in water process at rolled piece by " after along time delay " function block XJCLSC09 and produce pump trip pulse signal because heat inspection T117 and T118 moment flase drop loses; And obtain pump trip pulse signal by " front and back are along identifying " function block XJCLSC12.
(4) this Water cooling system has three high-voltage frequency-changing water pumps, adopt dual-purpose one standby or one standby with two in work, drop into simultaneously to prevent three high-voltage frequency-changing water pumps and start, high-voltage frequency-changing water pump power switch is caused to transship thus, in this shaped steel Water cooling high-voltage frequency-changing water pump control program, be provided with high-voltage frequency-changing water pump operation quantity limit unit, output (i.e. the output of the function block XJCLSC06) state of this unit is as one of the starting condition of each high-voltage frequency-changing water pump, like this, when three high-voltage frequency-changing water pumps drop into simultaneously, the output state of this unit ensure that Water cooling system can only drop at most two high-voltage frequency-changing water pumps for ' 0 '.
(5) for Water cooling system after H profile steel finish rolling, the structure of its three high-voltage frequency-changing water pump on off control unit is all identical, now illustrates for a high-voltage frequency-changing water pump on off control unit.In a high-voltage frequency-changing water pump on off control unit, the reset terminal R of RSR trigger function block XJCLSC23 is connected with the output of disjunction gate function block XJCLSC22, and this disjunction gate function block be input as a various termination of pumping signal of high-voltage frequency-changing water pump (that is: a high-voltage frequency-changing starting mode of pump Separation control, a high-pressure water pump runs time-out automatically, spray water valve is not opened, a high-pressure water pump way selection blocks, a high-voltage frequency-changing water pump drive fault, a manual termination of pumping of high-voltage frequency-changing water pump and a high-voltage frequency-changing water pump pump trip), when having any one signal for " 1 " in the input signal of this disjunction gate function block, the output terminal Q of above-mentioned RSR trigger function block XJCLSC23 is " 0 ", like this, a high-voltage frequency-changing water pump on off control unit will export termination of pumping instruction, in a high-voltage frequency-changing water pump on off control unit, the set end S of RSR trigger function block XJCLSC23 is connected with the output of " with door " function block XJCLSC21, and (that is: high-voltage frequency-changing water pump input quantity does not transfinite to be somebody's turn to do the correlated condition being input as a high-voltage frequency-changing starting mode of pump of " with door " function block, a high-voltage frequency-changing water pump drops into be selected, ready and the high-voltage frequency-changing water pump of high-voltage frequency-changing water pump transmission device manually boots signal or automatically activated signal), when the correlated condition of a high-voltage frequency-changing starting mode of pump all meets, a high-voltage frequency-changing water pump on off control unit is by this pump operation instruction (i.e. enabled instruction) of output.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technological scheme is carried out; or design of the present invention and technological scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (10)
1. the control system of a shaped steel Water cooling high-voltage frequency-changing water pump, it is characterized in that: this system comprises spray water valve condition monitoring unit, high-voltage frequency-changing water pump operation quantity limits unit, pump trip pulse signal generating unit, a high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit, described pump trip pulse signal generating unit, spray water valve condition monitoring unit, high-voltage frequency-changing water pump operation quantity limits unit and respective output signal is sent to respectively a high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit.
2. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, is characterized in that: described spray water valve is two groups of spray water valve groups, when two groups of spray water valve groups any one group close time, spray water valve condition monitoring unit output state is ' 1 '.
3. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, is characterized in that: described control system controls high-voltage frequency-changing water pump high-voltage frequency-changing water pump before water worn by shaped steel and automatically starts, and high-voltage frequency-changing water pump automatic stopping after water worn by shaped steel.
4. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, it is characterized in that: described pump trip pulse signal generating unit comprises forward position delay function block, afterwards along delay function block and front and back along authentication function block, the inspection signal of two hot metal detectors is sent to forward position delay function block and rear along delay function block respectively, front and back send control pump trip pulse signal to high-voltage frequency-changing water pump on off control unit along authentication function block respectively according to forward position delay function block and the rear input signal along delay function block, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit.
5. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 4, is characterized in that: described forward position delay function block XJCLSC08 is used for preventing pump in automatic start-up course because hot metal detector T117 or hot metal detector T118 moment flase drop obtains and produces pump trip pulse signal; Described " after along time delay " function block XJCLSC09 is used for preventing pump from wearing in water process at rolled piece and produces pump trip pulse signal because hot metal detector T117 and hot metal detector T118 moment flase drop loses.
6. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, is characterized in that: three high-voltage frequency-changing water pumps of this system adopt dual-purpose one standby or one by two standby control modes.
7. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, it is characterized in that: a described high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit are at high-voltage frequency-changing starting mode of pump Separation control, high-pressure water pump runs time-out automatically, spray water valve is not opened, high-pressure water pump way selection blocks, high-voltage frequency-changing water pump drive fault, when in the manual termination of pumping of high-voltage frequency-changing water pump and high-voltage frequency-changing water pump pump trip, any one input signal is ' 1 ', export termination of pumping instruction.
8. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, it is characterized in that: a described high-voltage frequency-changing water pump on off control unit, No. two high-voltage frequency-changing water pump on off control unit and No. three high-voltage frequency-changing water pump on off control unit do not transfinite at high-voltage frequency-changing water pump input quantity, high-voltage frequency-changing water pump drops into and selects, when the ready and high-voltage frequency-changing water pump of high-voltage frequency-changing water pump transmission device manually boots signal or automatically activated signal is all ' 1 ', exports this pump operation instruction.
9. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, is characterized in that: the speed adjustment spray flow of the quantity that this system is opened by spray water valve and high-voltage frequency-changing water pump and irrigation pressure.
10. the control system of shaped steel Water cooling high-voltage frequency-changing water pump according to claim 1, it is characterized in that: this system started the speed of selected high-voltage frequency-changing water pump to setting before shaped steel enters Water cooling device, block high-voltage frequency-changing water pump to power frequency variator when shaped steel afterbody leaves Water cooling device, make high-voltage frequency-changing water pump be in vehicle stop state.
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| CN112422021A (en) * | 2020-11-09 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Control method for preventing overload of variable frequency motor lifted by cantilever crane |
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| CN112422021A (en) * | 2020-11-09 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Control method for preventing overload of variable frequency motor lifted by cantilever crane |
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