CN108906749B - Control method of high-pressure water pump of billet descaling machine - Google Patents
Control method of high-pressure water pump of billet descaling machine Download PDFInfo
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- CN108906749B CN108906749B CN201811060415.2A CN201811060415A CN108906749B CN 108906749 B CN108906749 B CN 108906749B CN 201811060415 A CN201811060415 A CN 201811060415A CN 108906749 B CN108906749 B CN 108906749B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
The invention discloses a control method of a high-pressure water pump of a billet descaling machine, and a control program of the control method comprises the following control units: the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit; functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit; the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump; functional blocks XGCC 43-XGCC 53 form a manual start-stop control unit of the N-number high-pressure water pump. By adopting the technical scheme, the starting and stopping of the high-pressure water pump can be timely and reliably realized, the waste of energy and water sources is avoided, the phenomenon that the whole steel billet cannot be descaled or the whole steel billet cannot be descaled is avoided, and the quality of products is further improved.
Description
Technical Field
The invention belongs to the technical field of electric automation control. More particularly, the present invention relates to a control method of a high pressure water pump of a billet descaling machine.
Background
The small H-shaped steel billet descaling machine mainly comprises four high-pressure plunger water pumps (three in one), a descaling water spray valve, a descaling bypass valve, a billet descaling water spray ring and the like, wherein the transmission motor parameters of each high-pressure plunger water pump are 132KW, 380V and 230A.
The schematic structural diagram of the billet descaler is shown in fig. 1.
For the online steel billet descaling machine, the transmission motor of the high-pressure plunger water pump is directly powered by the MCC at power frequency, and the water pump is continuously in the power frequency power supply state after being started.
Therefore, in a non-descaling state, in order to prevent the water pump from being overloaded due to overhigh pressure at the outlet of the water pump, the descaling bypass valve at the outlet of the water pump is in an open state, when descaling is started (namely the hot metal detector detects the head of the steel billet before the descaling spray ring), the descaling spray valve is firstly opened and then the descaling bypass valve is closed, and after descaling is finished (namely the hot metal detector detects the tail of the steel billet after the descaling spray ring), the descaling bypass valve is firstly opened and then the descaling spray valve is closed.
For each small H-shaped steel billet, the output power of a transmission motor of the billet descaler high-pressure plunger water pump is about 75% of the rated power of the motor when short-time high-pressure descaling (the duration is about 9 seconds) is carried out on the billet; while the low-pressure bypass in the non-descaling state (duration approximately 130 seconds) still has a 38% motor rating for the drive motor output.
Therefore, in the production process, the billet descaling high-pressure water pump powered by the power frequency is in an unproductive bypass state, namely in an unproductive energy waste state most of the time.
Based on the method, the transmission motor of the high-pressure plunger water pump of the online billet descaling machine can be changed from MCC power frequency power supply to frequency converter power supply. Therefore, the power supply time and the power supply frequency of the water pump transmission motor can be controlled, so that the water pump can have high-pressure water output during descaling and can be in a stop state during non-descaling.
The problems are that: after a billet descaling machine high-pressure plunger water pump transmission motor is powered by an MCC power frequency instead of a frequency converter, because the speed of the frequency conversion high-pressure water pump is increased from a static state to a speed corresponding to descaling working pressure, the time is usually about 15 seconds, the key point is how to timely and reliably control the starting of the water pump frequency conversion motor aiming at the frequency conversion control of the small H-shaped steel billet descaling machine high-pressure water pump, and otherwise, the billet is not descaled by the whole poker or the poker is not descaled.
Disclosure of Invention
The invention provides a control method of a high-pressure water pump of a billet descaling machine, and aims to timely and reliably realize the start and stop of the high-pressure water pump.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to the control method of the high-pressure water pump of the billet descaling machine, the high-pressure water pump comprises a No. 1 pump and a No. N pump, wherein N is respectively equal to 2, 3 and 4; the control program of the control method includes the following control units:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) and the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit.
Under the conditions that a pump No. 1 is in a use state, a pump No. 1 MCC main contactor C1 is in an open state, a pump No. 1 is in a variable-frequency automatic starting mode, a pump No. 1 variable-frequency device is free of faults, a variable-frequency locking signal of a water pump is absent and a water spraying valve opening instruction of a descaler is absent, when a control system of a section steel heating furnace sends out a lifting instruction of a material taking arm of a heating furnace tapping machine and an opening instruction of a discharging furnace door of the heating furnace, the states of an output end Q of a functional block XGCC06 and an output end Q of an XGCC14 in an automatic start-stop control unit of the pump No. 1 are changed from '0' to '1', and the state of the output end Q of a functional block XGCC25 in the automatic start-stop control unit of the pump No. 1 also sends out an operation enabling signal; meanwhile, the state of the output end Q of the functional block XGCC26 in the automatic start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', and the automatic start-stop control unit of the No. 1 high-pressure water pump outputs a speed set value corresponding to the descaling working pressure of the No. 1 pump;
therefore, the pump No. 1 is accelerated from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation;
when the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation; at this time, as the opening command of the water injection valve of the descaler disappears, the output end QN of the functional block XGCC10 in the automatic start-stop control unit of the high-pressure water pump No. 1 will generate a pulse of '1' of a program cycle, so the state of the output end Q of the functional block XGCC14 in the automatic start-stop control unit of the high-pressure water pump No. 1 will be changed from '1' to '0', and thus the state of the output end Q of the functional block XGCC26 in the automatic start-stop control unit of the high-pressure water pump No. 1 will also be changed from '1' to '0', and the automatic start-stop control unit of the high-pressure water pump no.
If the descaling operation time of the descaling machine is over 2 hours, the state of the output end Q of the functional block XGCC25 in the automatic start-stop control unit of the No. 1 high-pressure water pump is changed from '1' to '0', the automatic start-stop control unit of the No. 1 high-pressure water pump blocks the operation enabling signal of the frequency conversion device of the No. 1 pump, and the No. 1 pump is in a stop state.
Under the conditions that the No. 1 pump is in a use state, the No. 1 pump MCC main contactor C1 is in an open state, the No. 1 pump is in a variable-frequency manual starting mode, the No. 1 pump variable-frequency device has no fault and a water pump variable-frequency locking signal does not exist, when an operator presses a manual starting instruction of the water pump, the state of the output end Q of the functional block XGCC24 in the No. 1 high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', thus, the state of the output end Q of the functional block XGCC25 in the manual start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', the manual start-stop control unit of the No. 1 high-pressure water pump sends out an operation enabling signal of the No. 1 pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC26 in the manual start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', and the manual start-stop control unit of the No. 1 high-pressure water pump outputs a speed set value corresponding to the descaling working pressure of the No. 1 pump;
therefore, the pump No. 1 is accelerated from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When an operator presses a manual water pump stopping instruction, the state of the output end Q of the functional block XGCC24 in the No. 1 high-pressure water pump manual start-stop control unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC25 in the No. 1 high-pressure water pump manual start-stop control unit is also changed from '1' to '0', the No. 1 high-pressure water pump manual start-stop control unit blocks the operation enabling signal of the No. 1 pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC26 in the No. 1 high-pressure water pump manual start-stop control unit is also changed from '1' to '0', and the No. 1 high-pressure water pump manual start-stop control unit sets the speed set value of the.
Under the conditions that an N pump is in a use state, an MCC main contactor CN of the N pump is in an open state, the N pump is in a variable frequency automatic starting mode, a variable frequency device of the N pump is free of faults, a variable frequency locking signal of a water pump is not available and a water injection valve of a descaler is not available, when a control system of a section steel heating furnace sends a lifting instruction of a material taking arm of a heating furnace tapping machine and an opening instruction of a discharging furnace door of the heating furnace, the states of output ends Q of functional blocks XGCC30 and XGCC38 in an automatic starting and stopping control unit of the N high-pressure water pump are changed from '0' to '1', so that the states of the output ends Q of the functional blocks XGCC49 in the automatic starting and stopping control unit of the N high-pressure water pump are also changed from '0' to '1', the automatic starting and stopping control unit of the N high-pressure water pump sends an operation enabling signal of the variable frequency device of the N pump, and simultaneously the states of the output, the automatic starting and stopping control unit of the N high-pressure water pump outputs a speed given value corresponding to the descaling working pressure of the N pump;
therefore, the N pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation;
when the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation; at this time, as the opening command of the water injection valve of the descaler disappears, the output end QN of the functional block XGCC34 in the automatic start-stop control unit of the high-pressure water pump No. N will generate a pulse of '1' of a program cycle, so the state of the output end Q of the functional block XGCC38 in the automatic start-stop control unit of the high-pressure water pump No. N will change from '1' to '0', and thus the state of the output end Q of the functional block XGCC50 in the automatic start-stop control unit of the high-pressure water pump No. N will also change from '1' to '0', and the automatic start-stop control unit of the high-pressure water pump No. N.
If the descaling operation time of the descaling machine is over 2 hours, the state of the output end Q of the functional block XGCC49 in the automatic start-stop control unit of the N-type high-pressure water pump is changed from '1' to '0', the automatic start-stop control unit of the N-type high-pressure water pump blocks the operation enabling signal of the frequency conversion device of the N-type pump, and the N-type pump is in a stop state.
Under the conditions that the N pump is in a use state, the main contactor CN of the N pump MCC is in an open state, the N pump is in a variable frequency manual starting mode, the N pump variable frequency device has no fault and a variable frequency locking signal of the waterless pump, when an operator presses a manual starting instruction of the water pump, the state of the output end Q of the functional block XGCC48 in the N-type high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', therefore, the state of the output end Q of the functional block XGCC49 in the manual start-stop control unit of the high-pressure water pump with the number N is changed from '0' to '1', the manual start-stop control unit of the high-pressure water pump with the number N sends out an operation enabling signal of the frequency conversion device with the number N, meanwhile, the state of the output end Q of the functional block XGCC50 in the manual start-stop control unit of the high-pressure water pump number N is changed from '0' to '1', and the manual start-stop control unit of the high-pressure water pump number N outputs a speed set value corresponding to the descaling working pressure of the pump number N.
When an operator presses a manual water pump stopping instruction, the state of the output end Q of the functional block XGCC48 in the N-number high-pressure water pump manual start-stop control unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC49 in the N-number high-pressure water pump manual start-stop control unit is also changed from '1' to '0', the N-number high-pressure water pump manual start-stop control unit blocks the operation enabling signal of the N-number pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC50 in the N-number high-pressure water pump manual start-stop control unit is also changed from '1' to '0', and the N-number high-pressure water pump manual start-stop control unit sets the speed set value of the.
By adopting the technical scheme, the starting and stopping of the high-pressure water pump can be timely and reliably realized, the waste of energy and water sources is avoided, and the phenomenon that the whole steel billet can not be descaled or the whole steel billet can not be descaled is avoided, so that the quality of products is improved.
Drawings
FIG. 1 is a schematic structural view of a billet descaling machine according to the present invention;
FIG. 2 is a structural view of a control program of a high pressure water pump of No. 1 of the steel billet descaler according to the present invention;
FIG. 3 is a structural view showing a control program of a high pressure water pump of No. N of the steel billet descaler according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
As shown in fig. 2 and 3, the control program structure of the control method of the high-pressure water pump of the billet descaling machine according to the present invention is shown, wherein the high-pressure water pump includes a pump No. 1 and a pump No. N, and N is equal to 2, 3, and 4, respectively.
In fig. 2 and 3:
NSW is a "digital switch" function block, when I ═ 1', Y ═ X2; when I ═ 0', Y ═ X1;
RSR is an RS trigger function block with preferential reset end R, when S is '1' and R is '0', Q is '1', and QN is '0'; when S is '1' and R is '1', Q is '0' and QN is '1'; when S is '0' and R is '0', Q and QN are kept in the original state; when S is '0' and R is '1', Q is '0' and QN is '1';
ETE is a function block of 'front and back edge identification', when an input end I is changed from '0' to '1', the QP end only outputs a positive pulse with the length of 1 cycle period, and the QP end is kept in a '0' state under other states; when the input end I is changed from '1' to '0', the QN end only outputs a positive pulse with the length of 1 cycle period, and the QN end is kept in a '0' state under the rest states;
the MFP is a 'pulse generator' functional block, when the input end I is changed from '0' to '1', the Q end outputs 1 positive pulse with the time length T, and during the period that the Q end outputs the positive pulse, the state change of the input end I has no influence on the output state of the Q end;
PDE is a 'leading edge delay' functional block;
PDF is a 'trailing edge delay' functional block;
OR is OR gate;
AND is AND gate;
NOT is "NOT gate".
In order to overcome the defects of the prior art and realize the purpose of timely and reliably realizing the start and stop of a high-pressure water pump, the design and control ideas of a high-pressure water pump control program of a billet descaler adopted by the invention are as follows:
as shown in fig. 2 and 3, a control program of the control method for the high-pressure water pump of the billet descaling machine according to the present invention includes:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) and the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit.
Specifically, the method comprises the following steps:
1. for the No. 1 high-pressure water pump automatic start-stop control unit, the program structure diagram of the unit shows that:
under the conditions that a pump No. 1 is in a use state (not in a standby state), a pump No. 1 MCC main contactor C1 is in an open state, a pump No. 1 is in a variable-frequency automatic starting mode, a pump No. 1 frequency conversion device is not in a fault state, a water pump variable-frequency locking signal is absent, and a descaler water spray valve opening instruction is absent, when a section steel heating furnace control system sends a heating furnace tapping machine material taking arm lifting instruction and a heating furnace discharging furnace door opening instruction, the states of an output end Q of functional blocks XGCC06 and XGCC14 in the unit are changed from '0' to '1', so that the state of the output end Q of the functional block XGCC25 in the unit is also changed from '0' to '1', and the unit sends a pump No. 1 frequency conversion device operation enabling signal; meanwhile, the state of the output end Q of the functional block XGCC26 in the unit is changed from '0' to '1', and the unit outputs a speed set value corresponding to the descaling working pressure of the No. 1 pump;
therefore, the No. 1 high-pressure water pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation;
considering that the variable-frequency speed-up time of the No. 1 high-pressure water pump is about 15 seconds, and the time required from the sending of the opening instruction of the discharging furnace door of the section steel heating furnace to the head of the section steel billet reaching the hot metal detector (heat detection for short) at the inlet of the descaler is about 20 seconds, it can be known that the No. 1 high-pressure water pump automatic start-stop control unit starts to start the No. 1 high-pressure water pump at the sending moment of the opening instruction of the discharging furnace door of the heating furnace, and the speed of the No. 1 high-pressure water pump is completely ensured to be increased to the speed corresponding to.
In order to avoid the situation that the heating furnace discharging furnace door is opened in a non-tapping state to cause the false start of the No. 1 high-pressure water pump, the heating furnace tapping machine steel taking arm lifting instruction is also used as one of the conditions of the automatic starting of the No. 1 high-pressure water pump in the No. 1 high-pressure water pump automatic starting and stopping control unit, and therefore the No. 1 high-pressure water pump automatic starting and stopping control unit starts to start the No. 1 high-pressure water pump only when the heating furnace tapping machine steel taking arm lifting instruction is sent out and then the heating furnace discharging furnace door opening instruction appears.
When the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation.
When the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation.
At this time, as the descaler water spray valve opening command disappears, the output QN of the functional block XGCC10 in the No. 1 high pressure water pump automatic start/stop control unit will generate a '1' pulse of one program cycle, so that the state of the output Q of the functional block XGCC14 in the unit will change from '1' to '0', and thus the state of the output Q of the functional block XGCC26 in the unit will also change from '1' to '0', and the unit will output the speed set value (e.g., 5% of the rated speed of the water pump drive motor) in the No. 1 pump non-descaled state.
If the descaler stops the descaling operation for more than 2 hours, the state of the output Q of the function block XGCC25 in the unit will also change from '1' to '0', the unit will block the enable signal for the operation of the pump frequency conversion device No. 1, and the pump No. 1 will be in a stopped state.
2. For the manual start-stop control unit of the No. 1 high-pressure water pump, the program structure diagram of the unit can show that:
under the conditions that a No. 1 pump is in a use state (not in a standby state), a No. 1 pump MCC main contactor C1 is in an open state, a No. 1 pump is in a frequency conversion manual starting mode, a No. 1 pump frequency conversion device is free of faults and a water pump frequency conversion locking signal is absent, when an operator presses a water pump manual starting command, the state of an output end Q of a functional block XGCC24 in a No. 1 high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', so that the state of the output end Q of the functional block XGCC25 in the unit is also changed from '0' to '1', the unit sends out a No. 1 pump frequency conversion device operation enabling signal, and meanwhile, the state of the output end Q of the functional block XGCC26 in the unit is also changed from '0' to '1', and the unit outputs a speed set value corresponding to the No. 1 pump descaling working;
therefore, the No. 1 high-pressure water pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When an operator presses a manual water pump stop command, the state of the output end Q of the functional block XGCC24 in the unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC25 in the unit is also changed from '1' to '0', the unit locks the operation enabling signal of the No. 1 pump frequency conversion device, and simultaneously the state of the output end Q of the functional block XGCC26 in the unit is also changed from '1' to '0', and the unit sets the No. 1 pump speed set value to 0 rpm.
3. For the automatic start-stop control unit of the N-number high-pressure water pump, the program structure diagram of the unit can show that:
under the conditions that the N pump is in a use state (not in a standby state), the main contactor CN of the MCC of the N pump is in an open state, the N pump is in a variable frequency automatic starting mode, the variable frequency device of the N pump has no fault, no variable frequency locking signal of a water pump and no opening instruction of a water spraying valve of a descaler, when the control system of the section steel heating furnace sends a lifting instruction of a material taking arm of a steel tapping machine of the heating furnace and an opening instruction of a discharging furnace door of the heating furnace, the states of the output end Q of the functional blocks XGCC30 and XGCC38 in the automatic start-stop control unit of the N-number high-pressure water pump are changed from '0' to '1', so that, the state of the output Q of the functional block XGCC49 in this cell will also change from '0' to '1', the unit sends out an enabling signal for the operation of the N-numbered pump frequency conversion device, simultaneously the state of an output end Q of a functional block XGCC50 in the unit is changed from '0' to '1', and the unit outputs a speed set value corresponding to the descaling working pressure of the N-numbered pump;
therefore, the N high-pressure water pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation.
When the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation;
at this time, as the descaler water spray valve opening command disappears, the output QN of the functional block XGCC34 in the No. N high pressure water pump automatic start/stop control unit will generate a '1' pulse of one program cycle, so that the state of the output Q of the functional block XGCC38 in the unit will change from '1' to '0', and thus the state of the output Q of the functional block XGCC50 in the unit will also change from '1' to '0', and the unit will output the speed set value (e.g., 5% of the rated speed of the water pump drive motor) in the No. N pump descaled state.
If the descaler stops the descaling operation for more than 2 hours, the state of the output Q of the function block XGCC49 in the unit is changed from '1' to '0', the unit blocks the enable signal for the operation of the frequency conversion device of the number N pump, and the number N pump is stopped.
4. For the manual start-stop control unit of the N-number high-pressure water pump, the program structure diagram of the unit can show that:
under the conditions that the number N pump is in a use state (not in a standby state), the main contactor CN of the number N pump MCC is in an open state, the number N pump is in a frequency conversion manual starting mode, the number N pump frequency conversion device has no fault and no water pump frequency conversion locking signal, when an operator presses a water pump manual starting command, the state of the output end Q of the functional block XGCC48 in the number N high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', so that the state of the output end Q of the functional block XGCC49 in the unit is also changed from '0' to '1', the unit sends out an operation enabling signal of the number N pump frequency conversion device, and simultaneously the state of the output end Q of the functional block XGCC50 in the unit is also changed from '0' to '1', and the unit outputs a speed set value corresponding to the number N pump descaling working pressure.
Therefore, the N high-pressure water pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
When an operator presses a manual water pump stop command, the state of the output end Q of the functional block XGCC48 in the unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC49 in the unit is also changed from '1' to '0', the unit locks the operation enabling signal of the N-number pump frequency conversion device, and simultaneously the state of the output end Q of the functional block XGCC50 in the unit is also changed from '1' to '0', and the unit sets the N-number pump speed set value to 0 rpm.
The invention provides a control method (or a control program) of a high-pressure water pump of a billet descaler, aiming at a small H-shaped steel billet descaler and aiming at timely and reliably realizing the start and stop of the high-pressure water pump. The control program (or control method) of the high-pressure water pump of the billet descaling machine is put into use in a small H-shaped steel descaling machine control system.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (10)
1. A control method of a high-pressure water pump of a billet descaling machine comprises the steps that the high-pressure water pump comprises a No. 1 pump and a No. N pump, wherein N is respectively equal to 2, 3 and 4; the method is characterized in that: the control program of the control method includes the following control units:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit;
under the conditions that a pump No. 1 is in a use state, a pump No. 1 MCC main contactor C1 is in an open state, a pump No. 1 is in a variable-frequency automatic starting mode, a pump No. 1 variable-frequency device is free of faults, a variable-frequency locking signal of a water pump is absent and a water spraying valve opening instruction of a descaler is absent, when a control system of a section steel heating furnace sends out a lifting instruction of a material taking arm of a heating furnace tapping machine and an opening instruction of a discharging furnace door of the heating furnace, the states of an output end Q of a functional block XGCC06 and an output end Q of an XGCC14 in an automatic start-stop control unit of the pump No. 1 are changed from '0' to '1', and the state of the output end Q of a functional block XGCC25 in the automatic start-stop control unit of the pump No. 1 also sends out an operation enabling signal; meanwhile, the state of the output end Q of the functional block XGCC26 in the automatic start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', and the automatic start-stop control unit of the No. 1 high-pressure water pump outputs a speed set value corresponding to the descaling working pressure of the No. 1 pump;
therefore, the pump No. 1 is accelerated from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
2. The control method of a high pressure water pump of a billet descaler according to claim 1, wherein:
when the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation;
when the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation; at this time, as the opening command of the water injection valve of the descaler disappears, the output end QN of the functional block XGCC10 in the automatic start-stop control unit of the high-pressure water pump No. 1 will generate a pulse of '1' of a program cycle, so the state of the output end Q of the functional block XGCC14 in the automatic start-stop control unit of the high-pressure water pump No. 1 will be changed from '1' to '0', and thus the state of the output end Q of the functional block XGCC26 in the automatic start-stop control unit of the high-pressure water pump No. 1 will also be changed from '1' to '0', and the automatic start-stop control unit of the high-pressure water pump no.
3. The control method of a high pressure water pump of a billet descaler according to claim 2, wherein: if the descaling operation time of the descaling machine is over 2 hours, the state of the output end Q of the functional block XGCC25 in the automatic start-stop control unit of the No. 1 high-pressure water pump is changed from '1' to '0', the automatic start-stop control unit of the No. 1 high-pressure water pump blocks the operation enabling signal of the frequency conversion device of the No. 1 pump, and the No. 1 pump is in a stop state.
4. A control method of a high-pressure water pump of a billet descaling machine comprises the steps that the high-pressure water pump comprises a No. 1 pump and a No. N pump, wherein N is respectively equal to 2, 3 and 4; the method is characterized in that: the control program of the control method includes the following control units:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit;
under the conditions that the No. 1 pump is in a use state, the No. 1 pump MCC main contactor C1 is in an open state, the No. 1 pump is in a variable-frequency manual starting mode, the No. 1 pump variable-frequency device has no fault and a water pump variable-frequency locking signal does not exist, when an operator presses a manual starting instruction of the water pump, the state of the output end Q of the functional block XGCC24 in the No. 1 high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', thus, the state of the output end Q of the functional block XGCC25 in the manual start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', the manual start-stop control unit of the No. 1 high-pressure water pump sends out an operation enabling signal of the No. 1 pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC26 in the manual start-stop control unit of the No. 1 high-pressure water pump is changed from '0' to '1', and the manual start-stop control unit of the No. 1 high-pressure water pump outputs a speed set value corresponding to the descaling working pressure of the No. 1 pump;
therefore, the pump No. 1 is accelerated from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
5. The control method of a high pressure water pump of a billet descaler according to claim 4, wherein: when an operator presses a manual water pump stopping instruction, the state of the output end Q of the functional block XGCC24 in the No. 1 high-pressure water pump manual start-stop control unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC25 in the No. 1 high-pressure water pump manual start-stop control unit is also changed from '1' to '0', the No. 1 high-pressure water pump manual start-stop control unit blocks the operation enabling signal of the No. 1 pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC26 in the No. 1 high-pressure water pump manual start-stop control unit is also changed from '1' to '0', and the No. 1 high-pressure water pump manual start-stop control unit sets the speed set value of the.
6. A control method of a high-pressure water pump of a billet descaling machine comprises the steps that the high-pressure water pump comprises a No. 1 pump and a No. N pump, wherein N is respectively equal to 2, 3 and 4; the method is characterized in that: the control program of the control method includes the following control units:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit;
under the conditions that an N pump is in a use state, an MCC main contactor CN of the N pump is in an open state, the N pump is in a variable frequency automatic starting mode, a variable frequency device of the N pump is free of faults, a variable frequency locking signal of a water pump is not available and a water injection valve of a descaler is not available, when a control system of a section steel heating furnace sends a lifting instruction of a material taking arm of a heating furnace tapping machine and an opening instruction of a discharging furnace door of the heating furnace, the states of output ends Q of functional blocks XGCC30 and XGCC38 in an automatic starting and stopping control unit of the N high-pressure water pump are changed from '0' to '1', so that the states of the output ends Q of the functional blocks XGCC49 in the automatic starting and stopping control unit of the N high-pressure water pump are also changed from '0' to '1', the automatic starting and stopping control unit of the N high-pressure water pump sends an operation enabling signal of the variable frequency device of the N pump, and simultaneously the states of the output, the automatic starting and stopping control unit of the N high-pressure water pump outputs a speed given value corresponding to the descaling working pressure of the N pump;
therefore, the N pump accelerates from a static state to a speed set value corresponding to the descaling working pressure according to the acceleration rate set by the frequency conversion device.
7. The control method of a high pressure water pump of a billet descaler according to claim 6, wherein:
when the head of the steel billet reaches the hot detection of the inlet of the descaling machine, the online descaling machine control system respectively sends out a water spray valve opening instruction and a bypass valve closing instruction, so that the descaling machine starts descaling operation;
when the tail of the descaling steel billet leaves the outlet of the descaling machine for thermal detection, the online descaling machine control system respectively sends out a bypass valve opening instruction and a spray valve closing instruction, so that the descaling machine stops descaling operation; at this time, as the opening command of the water injection valve of the descaler disappears, the output end QN of the functional block XGCC34 in the automatic start-stop control unit of the high-pressure water pump No. N will generate a pulse of '1' of a program cycle, so the state of the output end Q of the functional block XGCC38 in the automatic start-stop control unit of the high-pressure water pump No. N will change from '1' to '0', and thus the state of the output end Q of the functional block XGCC50 in the automatic start-stop control unit of the high-pressure water pump No. N will also change from '1' to '0', and the automatic start-stop control unit of the high-pressure water pump No. N.
8. The control method of a high pressure water pump of a billet descaler according to claim 7, wherein: if the descaling operation time of the descaling machine is over 2 hours, the state of the output end Q of the functional block XGCC49 in the automatic start-stop control unit of the N-type high-pressure water pump is changed from '1' to '0', the automatic start-stop control unit of the N-type high-pressure water pump blocks the operation enabling signal of the frequency conversion device of the N-type pump, and the N-type pump is in a stop state.
9. A control method of a high-pressure water pump of a billet descaling machine comprises the steps that the high-pressure water pump comprises a No. 1 pump and a No. N pump, wherein N is respectively equal to 2, 3 and 4; the method is characterized in that: the control program of the control method includes the following control units:
1) the functional blocks XGCC 01-XGCC 18 and XGCC 25-XGCC 29 form a No. 1 high-pressure water pump automatic start-stop control unit;
2) functional blocks XGCC 19-XGCC 29 form a No. 1 high-pressure water pump manual start-stop control unit;
3) the functional blocks XGCC 30-XGCC 42 and XGCC 49-XGCC 53 form an automatic start-stop control unit of the N-number high-pressure water pump;
4) the functional blocks XGCC 43-XGCC 53 form an N-number high-pressure water pump manual start-stop control unit;
under the conditions that the N pump is in a use state, the main contactor CN of the N pump MCC is in an open state, the N pump is in a variable frequency manual starting mode, the N pump variable frequency device has no fault and a variable frequency locking signal of the waterless pump, when an operator presses a manual starting instruction of the water pump, the state of the output end Q of the functional block XGCC48 in the N-type high-pressure water pump manual starting and stopping control unit is changed from '0' to '1', therefore, the state of the output end Q of the functional block XGCC49 in the manual start-stop control unit of the high-pressure water pump with the number N is changed from '0' to '1', the manual start-stop control unit of the high-pressure water pump with the number N sends out an operation enabling signal of the frequency conversion device with the number N, meanwhile, the state of the output end Q of the functional block XGCC50 in the manual start-stop control unit of the high-pressure water pump number N is changed from '0' to '1', and the manual start-stop control unit of the high-pressure water pump number N outputs a speed set value corresponding to the descaling working pressure of the pump number N.
10. The control method of a high pressure water pump of a billet descaler according to claim 9, wherein: when an operator presses a manual water pump stopping instruction, the state of the output end Q of the functional block XGCC48 in the N-number high-pressure water pump manual start-stop control unit is changed from '1' to '0', so that the state of the output end Q of the functional block XGCC49 in the N-number high-pressure water pump manual start-stop control unit is also changed from '1' to '0', the N-number high-pressure water pump manual start-stop control unit blocks the operation enabling signal of the N-number pump frequency conversion device, meanwhile, the state of the output end Q of the functional block XGCC50 in the N-number high-pressure water pump manual start-stop control unit is also changed from '1' to '0', and the N-number high-pressure water pump manual start-stop control unit sets the speed set value of the.
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