CN107168387A - Radial up-down control method based on section steel sawing machine radial up-down control system - Google Patents
Radial up-down control method based on section steel sawing machine radial up-down control system Download PDFInfo
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- CN107168387A CN107168387A CN201710530721.7A CN201710530721A CN107168387A CN 107168387 A CN107168387 A CN 107168387A CN 201710530721 A CN201710530721 A CN 201710530721A CN 107168387 A CN107168387 A CN 107168387A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
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Abstract
The present invention is applied to hydraulic pressure drive control system technical field, a kind of section steel sawing machine radial up-down control method is devised there is provided a kind of hydraulic control device based in existing section steel sawing machine radial up-down control system, rocking arm in the control method highly keeps control unit when rocking arm actual height value and the difference of rocking arm height retention value exceed setting range, pi regulator functional block provides the radial up-down control proportioning valve control voltage needed for rocking arm height correction, rocking arm actual height and the difference of rocking arm height retention value is maintained to be in permissible range with this, therefore remain under state maintain rocking arm normal work in a certain amount of interior let out in saw radial up-down oscillating motor, the usage cycles of saw radial up-down oscillating motor can be also made to be increased dramatically.
Description
Technical field
The invention belongs to hydraulic pressure drive control system technical field, more particularly to a kind of section steel sawing machine radial up-down control method.
Background technology
Ma Gang little H profile steel production lines are provided with two H profile steel cold saws, and this two breast bench is manufactured by Italian plant equipment
Business Dary alunite company integrally provides.Its saw is main by saw blade hydraulic feed unit, saw blade hydraulicefficiency elevation structure (abbreviation rocking arm
Mechanism), main drive motor, main transmission reductor oil lubricating system constituted, the rocker arm body in the saw is main by shaking
Arm body, radial up-down swinging mounting, the radial up-down oscillating motor installed in one end and another installed in rocking arm
The main transmission gearbox and saw blade at end are constituted.Saw is before sawing starts, and saw control system will be according to actual saw blade diameter
By radial up-down oscillating motor proportional control valve make saw blade be automatically positioned at sawing needed for height, positioning finish after, shake
Arm lifting and swinging hydraulic cylinder proportional control valve will be in middle position self-locking state all the time, until saw sawing is finished.It follows that should
Saw is to be in middle position self-locking to keep the sawing height of saw blade by radial up-down oscillating motor proportional control valve, this to shake
Saw blade height (i.e. the height in saw blade centre-to-centre spacing saw roller-way face) control mode of arm mechanism is to radial up-down oscillating motor
State is inside let out with higher requirement, if radial up-down oscillating motor its piston and cylinder inner chamber after a certain period of use time is close
Sealing property declines, so, in sawing process, because saw blade will be born from the acting in opposition by sawing shaped steel vertically upward
Power, saw rocking arm being let out in the presence of its lifting and swinging hydraulic cylinder and occurring persistently upwarping movement, thus causes saw blade because of position
It is higher and can not sawed-off shaped steel.
The content of the invention
The embodiment of the present invention provides a kind of section steel sawing machine radial up-down control method, it is intended to solve in sawing process, due to
Saw blade will be born from the opposition by sawing shaped steel vertically upward, and saw rocking arm will exist because of its lifting and swinging hydraulic cylinder
Inside let out and occur persistently upwarping movement, thus cause saw blade because position is higher can not sawed-off shaped steel the problem of.
The embodiments of the invention provide a kind of section steel sawing machine radial up-down control method, the section steel sawing machine radial up-down control
System processed is made up of six units, i.e. functional block XJYSJC01 and XJYSJC02 constitute saw blade actual height computing unit, function
Block XJYSJC03~XJYSJC11 and XJYSJC37 constitute rocking arm and decline Positioning Control Unit automatically, and functional block XJYSJC12~
XJYSJC18 and XJYSJC37 constitute rocking arm and rise Positioning Control Unit automatically, functional block XJYSJC19~XJYSJC22 and
XJYSJC37 constitute rocking arm Manual descending Positioning Control Unit, functional block XJYSJC23~XJYSJC25, XJYSJC17,
XJYSJC18 and XJYSJC37 constitutes rocking arm and rises Positioning Control Unit manually, and functional block XJYSJC26~XJYSJC37 is constituted
The highly automated holding control unit of saw blade, the radial up-down control method bag based on section steel sawing machine radial up-down control system
Include following steps：
S1, when the saw blade actual height computing unit is by the physical location of saw rocking arm oscillating lifting hydraulic cylinder piston rod
Value is multiplied by conversion coefficient k and obtains saw blade maximum height HmaxWith current saw blade actual height H difference, the conversion coefficient value isHmaxThe height value of saw blade, H when being fully retracted into for rocking arm oscillating lifting hydraulic cylinder piston rodminFor rocking arm
The height value of saw blade, L when oscillating lifting hydraulic cylinder piston rod all stretches outmStretched out entirely for rocking arm oscillating lifting hydraulic cylinder piston rod
Length.So, saw blade actual height computing unit passes through saw blade maximum height HmaxSubtract saw blade maximum height HmaxWith it is current
Saw blade actual height H difference and obtain saw blade actual height；
S2, in saw saw blade not in the case where sawing height and saw are in automated manner, in saw automatic sawing, cutting
After enabled instruction is sent, the rocking arm declines Positioning Control Unit and corresponded to for one to the output of radial up-down control proportioning valve automatically
Rocking arm declines the control voltage of setting speed automatically, and the saw rocking arm will be decreased until saw automatically according to the decrease speed of setting
Piece reaches sawing height；
S3, in saw rocking arm not in the case where high-order and saw is in automated manner, when saw supplying position reaches
During the horizontal sawing final position of saw setting, the rocking arm rises Positioning Control Unit and gives radial up-down control proportioning valve output automatically
One corresponds to the control voltage that rocking arm rises setting speed automatically, and the saw rocking arm will be automatic according to the rate of climb of setting
Rise until rocking arm reaches high-order；
S4, saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without
It is tight to stop signal, saw rocking arm not in the case where low level and saw are in manual mode, when saw radial up-down control system
When sending the instruction of rocking arm Manual descending, the rocking arm Manual descending control unit is right to radial up-down control proportioning valve output one
Should be in the control voltage of rocking arm Manual descending setting speed, under the saw rocking arm will be carried out according to the Manual descending speed of setting
Drop operation is terminated or rocking arm arrival low level until rocking arm Manual descending is instructed；
S5, saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without
It is tight to stop signal, rocking arm not in the case where high-order and saw is in manual mode, shaken when machine radial up-down control system is sent
During the manual climb command of arm, the rocking arm rises control unit and exports one to radial up-down control proportioning valve and correspond to manually to be shaken
Arm rises the control voltage of setting speed manually, and the saw rocking arm will carry out lifting operations according to the manual rate of climb of setting
Until the manual climb command of rocking arm is terminated or a rocking arm arrival high position；
S6, when saw rocking arm is manually operated or the operation of saw rocking arm automatic lifting is terminated, the rocking arm highly keeps controlling
Unit processed obtains rocking arm actual height value when manually operated saw rocking arm or the operation termination of saw rocking arm automatic lifting, and should
Rocking arm actual height value is set to the position set-point of the pi regulator functional block in described control unit, i.e., referred to as rocking arm is highly protected
Value is held, in addition, in saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without tight
Stop signal, saw in automatic or manual mode and rocking arm actual height value and the difference of rocking arm height retention value exceed setting model
When enclosing, pi regulator functional block is enabled, and pi regulator functional block will be according to rocking arm actual height value and rocking arm height retention value
Difference, provide the radial up-down control proportioning valve control voltage needed for rocking arm height correction so that rocking arm actual height and rocking arm
The difference of height retention value is in permissible range.
The embodiment of the present invention devises a kind of section steel sawing machine rocking arm based on the existing hydraulic control device of section steel sawing machine rocking arm
Rocking arm in lift control method, the control method highly keeps control unit highly to be kept in rocking arm actual height value and rocking arm
When the difference of value exceeds setting range, pi regulator functional block provides the radial up-down control Proportional Valve-controlled needed for rocking arm height correction
Voltage processed, maintains rocking arm actual height and the difference of rocking arm height retention value to be in permissible range, therefore shaken in saw with this
Arm lifting and swinging hydraulic cylinder remains under state maintain rocking arm normal work in a certain amount of interior let out, and saw radial up-down can also put
The usage cycles of hydrodynamic cylinder pressure are increased dramatically.
Brief description of the drawings
Fig. 1 is the schematic diagram of section steel sawing machine radial up-down hydraulic system provided in an embodiment of the present invention；
Fig. 2 is the program structure schematic diagram of section steel sawing machine radial up-down control system provided in an embodiment of the present invention；
2-1. rocking arm oscillating liftings hydraulic cylinder, 2-2. balanced valves, 2-3. hydraulically-controlled one-way valves, 2-4. radial up-downs control ratio
Valve, 2-5. filters.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the schematic diagram of section steel sawing machine radial up-down hydraulic system provided in an embodiment of the present invention, and Fig. 2 is real for the present invention
The program structure schematic diagram of the section steel sawing machine radial up-down control system of example offer is provided, for convenience of description, only shown and this hair
The related part of bright embodiment.
As shown in Fig. 2 NSW is " digital change-over switch " functional block, and as I=' 1 ', Y=X2, as I=' 0 ', Y=
X1；RSR is " rest-set flip-flop preferential reset terminal R " functional block, and when it is ' 0 ' that S, which is ' 1 ', R, Q is that ' 1 ', QN is ' 0 ', when S is
When ' 1 ', R are ' 1 ', Q is that ' 0 ', QN is ' 1 ', when it is ' 0 ' that S, which is ' 0 ', R, and Q and QN keep ortho states, when S is that ' 0 ', R is ' 1 '
When, Q is that ' 0 ' QN is ' 1 '；LVM2 is " the overproof detection of numerical value " functional block, and in the case of HY=0, as X >=M+L, QU is
' 1 ', as M-L ＜ X ＜ M+L, QM is ' 1 ', as X≤M-L, and QL is ' 1 '；NCM is " numeric ratio compared with " functional block, as X1 ＞
During X2, QU is ' 1 ', as X1=X2, and QE is ' 1 ', as X1 ＜ X2, and QL is ' 1 '；SUB is " subtracter " functional block；ADD is
" adder " functional block；MUL is " multiplier " functional block；PIC is pi regulator functional block；OR is disjunction gate；AND for " with
Door "；NOT is inverter, and the shaped steel radial up-down control system is made up of six units, i.e. functional block XJYSJC01 and
XJYSJC02 constitutes saw blade actual height computing unit, functional block XJYSJC03~XJYSJC11 and XJYSJC37 and constitutes rocking arm
Automatic Positioning Control Unit, functional block XJYSJC12~XJYSJC18 and the XJYSJC37 composition rocking arms of declining rises positioning automatically
Control unit, functional block XJYSJC19~XJYSJC22 and XJYSJC37 constitute rocking arm Manual descending Positioning Control Unit, work(
Energy block XJYSJC23~XJYSJC25, XJYSJC17, XJYSJC18 and XJYSJC37 constitutes rocking arm and rises location control manually
Unit, functional block XJYSJC26~XJYSJC37 constitute the highly automated holding control unit of saw blade.
Radial up-down control method based on above-mentioned section steel sawing machine radial up-down control system comprises the following steps：
Saw blade actual height computing unit is made up of functional block XJYSJC01 and XJYSJC02, by saw rocking arm oscillating lifting
Actual position value (when rocking arm oscillating lifting hydraulic cylinder piston rod is fully retracted into, piston rod is in zero-bit) warp of hydraulic cylinder piston rod
Multiplier function block XJYSJC01 is multiplied by conversion coefficient k and obtains saw blade maximum height HmaxWith current saw blade actual height H difference
It is worth, the conversion coefficient value isHmaxSawed when being fully retracted into for rocking arm oscillating lifting hydraulic cylinder piston rod
The height value of piece, HminThe height value of saw blade, L when all being stretched out for rocking arm oscillating lifting hydraulic cylinder piston rodmSwing and rise for rocking arm
The length that drop hydraulic cylinder piston rod stretches out entirely.So, current saw blade reality can be obtained in subtracter functional block XJYSJC02 output ends Y
Border height value H.
For example, when rocking arm oscillating lifting hydraulic cylinder piston rod full reduced time (i.e. 0 millimeter position), saw blade is highly 1400 millis
Rice, and when rocking arm oscillating lifting hydraulic cylinder piston rod stretches out (i.e. 215 millimeters) entirely, saw blade is highly 1050 millimeters, conversion system
Numerical value is 1.628=(1400-1050) ÷ 215, and so, the calculation formula of the actual height of saw blade is：H=1400-1.628*
L is the length that rocking arm oscillating lifting hydraulic cylinder piston rod stretches out in L, formula.
For the automatic decline Positioning Control Unit of rocking arm, in saw main transmission, saw hydraulic and lubricating system and saw
The equal fault-free of rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw rolled piece picking-up device have been held up, clamp on saw clamped,
Saw entry/exit mouthful side clamp arm has been clamped, saw roller table speed is that zero, saw stops signal, saw saw blade not in sawing height without tight
Spend and in the case that saw is in automated manner, after saw automatic sawing, cutting enabled instruction is sent, it is fixed that the rocking arm declines automatically
The state of functional block XJYSJC10 output ends Q in the control unit of position will become ' 1 ' by ' 0 ', thus, pass through functional block XJYSJC11
Control proportioning valve to export one to radial up-down with XJYSJC37 and correspond to the control voltage that rocking arm declines setting speed automatically, this
Sample, saw rocking arm will be decreased until that saw blade reaches sawing position, i.e. sawing height automatically according to the decrease speed of setting.
In saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without tightly stopping
Signal, saw rocking arm be not in the case where high-order and saw is in automated manner, and when the horizontal sawing position of saw, (saw is fed
Position) reach saw setting horizontal sawing final position when, the rocking arm rises the functional block in Positioning Control Unit automatically
XJYSJC16 output ends Q state will become ' 1 ' by ' 0 ', thus, pass through functional block XJYSJC17, XJYSJC18 and XJYSJC37
Control proportioning valve to export one to radial up-down and correspond to the control voltage that rocking arm rises setting speed automatically, so, saw shakes
Arm will automatically rise according to the rate of climb of setting until rocking arm reaches high-order.
For the person and equipment safety, saw rocking arm forbids hand-operated lifting to operate in rolled piece sawing process, thus, rocking arm
Manual descending control unit is only used for the rocking arm step-down operation under non-sawing state, is put in saw hydraulic system and saw rocking arm
The dynamic equal fault-free of lifting hydraulic cylinder position coder, saw stop signal, rocking arm not in low level and saw is in manual side without tight
In the case of formula, when saw radial up-down control system sends the instruction of rocking arm Manual descending, rocking arm Manual descending control unit
Middle functional block XJYSJC21 output ends Q state will become ' 1 ' by ' 0 ', thus, be given by functional block XJYSJC22 and XJYSJC37
Radial up-down control proportioning valve exports a control voltage for corresponding to rocking arm Manual descending setting speed, so, saw rocking arm
Terminated step-down operation is carried out according to the Manual descending speed of setting or rocking arm arrival low level until rocking arm Manual descending is instructed.
Rocking arm rises the rocking arm lifting operations that control unit is only used under non-sawing state manually, saw hydraulic system with
And the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw stop signal, rocking arm not high-order and saw without tight
In the case that machine is in manual mode, when machine radial up-down control system sends the manual climb command of rocking arm, on rocking arm is manual
Rise control unit in functional block XJYSJC25 output ends Q state will by ' 0 ' become ' 1 ', thus, by functional block XJYSJC17,
XJYSJC18 and XJYSJC37 controls proportioning valve to export a control for rising setting speed manually corresponding to rocking arm to radial up-down
Voltage processed, so, saw rocking arm will carry out lifting operations until the manual climb command of rocking arm according to the manual rate of climb of setting
Terminate or rocking arm reaches high-order.
When manually or automatically descending operation is terminated saw rocking arm, rocking arm highly keeps functional block in control unit
XJYSJC27 output ends Q state will become ' 1 ' by ' 0 ', and functional block XJYSJC28 output ends Y is the rocking arm actual height at the moment
Being used for rocking arm in value, the control unit highly keeps the pi regulator functional block XJYSJC35 of control position set-point to be also to be somebody's turn to do
The rocking arm actual height value at moment, abbreviation rocking arm height retention value.Risen in addition, being swung in saw hydraulic system and saw rocking arm
The equal fault-free of descending liquid cylinder pressure position coder, saw are in automatic or manual mode and rocking arm reality without tight signal, the saw of stopping
In the case that the difference of height value and rocking arm height retention value exceeds setting range, control is highly kept for rocking arm in the control unit
The pi regulator functional block XJYSJC35 of system is enabled.So, rocking arm highly keeps control pi regulator functional block XJYSJC35
Will be according to rocking arm actual height value and the difference of rocking arm height retention value, shaking needed for its output end Y provides rocking arm height correction
Arm elevating control proportional valve control voltage, maintains rocking arm actual height and the difference of rocking arm height retention value to be in and allow model with this
In enclosing.
The embodiment of the present invention devises a kind of section steel sawing machine rocking arm based on the existing hydraulic control device of section steel sawing machine rocking arm
Rocking arm in lift control method, the control method highly keeps control unit highly to be kept in rocking arm actual height value and rocking arm
When the difference of value exceeds setting range, pi regulator functional block provides the radial up-down control Proportional Valve-controlled needed for rocking arm height correction
Voltage processed, maintains rocking arm actual height and the difference of rocking arm height retention value to be in permissible range, therefore shaken in saw with this
Arm lifting and swinging hydraulic cylinder remains under state maintain rocking arm normal work in a certain amount of interior let out, and saw radial up-down can also put
The usage cycles of hydrodynamic cylinder pressure are increased dramatically.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (1)
1. a kind of radial up-down control method based on section steel sawing machine radial up-down control system, the section steel sawing machine radial up-down
Control system is made up of six units, i.e. functional block XJYSJC01 and XJYSJC02 constitute saw blade actual height computing unit, work(
Energy block XJYSJC03~XJYSJC11 and XJYSJC37 constitute rocking arm and decline Positioning Control Unit, functional block XJYSJC12 automatically
~XJYSJC18 and XJYSJC37 constitute rocking arm and rise Positioning Control Unit automatically, functional block XJYSJC19~XJYSJC22 with
And XJYSJC37 constitute rocking arm Manual descending Positioning Control Unit, functional block XJYSJC23~XJYSJC25, XJYSJC17,
XJYSJC18 and XJYSJC37 constitutes rocking arm and rises Positioning Control Unit manually, and functional block XJYSJC26~XJYSJC37 is constituted
The highly automated holding control unit of saw blade, it is characterised in that the rocking arm liter based on section steel sawing machine radial up-down control system
Drop control method comprises the following steps：
S1, the actual position value of saw rocking arm oscillating lifting hydraulic cylinder piston rod is multiplied when the saw blade actual height computing unit
Saw blade maximum height H is obtained with conversion coefficient kmaxWith current saw blade actual height H difference, the conversion coefficient value isHmaxThe height value of saw blade, H when being fully retracted into for rocking arm oscillating lifting hydraulic cylinder piston rodminFor rocking arm
The height value of saw blade, L when oscillating lifting hydraulic cylinder piston rod all stretches outmStretched out entirely for rocking arm oscillating lifting hydraulic cylinder piston rod
Length, the saw blade actual height computing unit is by by saw blade maximum height HmaxSubtract saw blade maximum height HmaxWith it is current
Saw blade actual height H difference and obtain saw blade actual height；
S2, in saw saw blade not in the case where sawing height and saw are in automated manner, start in saw automatic sawing, cutting
After instruction is sent, the rocking arm declines Positioning Control Unit and exports one corresponding to rocking arm to radial up-down control proportioning valve automatically
The automatic control voltage for declining setting speed, the saw rocking arm will be decreased until that saw blade is arrived automatically according to the decrease speed of setting
Up to sawing height；
S3, in saw rocking arm not in the case where high-order and saw is in automated manner, when saw supplying position reaches saw
During the horizontal sawing final position of setting, the rocking arm rises Positioning Control Unit and exports one to radial up-down control proportioning valve automatically
Rise the control voltage of setting speed automatically corresponding to rocking arm, the saw rocking arm will automatically rise according to the rate of climb of setting
Until rocking arm reaches high-order；
S4, in saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without tightly stopping
Signal, saw rocking arm be not in the case where low level and saw are in manual mode, when saw radial up-down control system is sent
When rocking arm Manual descending is instructed, the rocking arm Manual descending control unit exports one to radial up-down control proportioning valve and corresponded to
The control voltage of rocking arm Manual descending setting speed, the saw rocking arm will carry out decline behaviour according to the Manual descending speed of setting
Make to terminate or rocking arm arrival low level until rocking arm Manual descending is instructed；
S5, in saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without tightly stopping
Signal, rocking arm be not in the case where high-order and saw is in manual mode, when machine radial up-down control system sends rocking arm hand
During dynamic climb command, the rocking arm rises control unit and exports one corresponding to rocking arm hand to radial up-down control proportioning valve manually
The dynamic control voltage for rising setting speed, the saw rocking arm by according to the manual rate of climb of setting carry out lifting operations until
The manual climb command of rocking arm is terminated or rocking arm reaches high-order；
S6, when saw rocking arm is manually operated or the operation of saw rocking arm automatic lifting is terminated, the rocking arm highly keeps controlling singly
Member obtains rocking arm actual height value when saw rocking arm is manually operated or the operation of saw rocking arm automatic lifting is terminated, and by the rocking arm
Actual height value is set to the position set-point of the pi regulator functional block in described control unit, i.e., referred to as rocking arm is highly kept
Value, in addition, in saw hydraulic system and the equal fault-free of saw rocking arm oscillating lifting Position of Hydraulic Cylinder encoder, saw without tightly stopping
Signal, saw are in automatic or manual mode and rocking arm actual height value and the difference of rocking arm height retention value exceed setting range
When, pi regulator functional block is enabled, pi regulator functional block will according to rocking arm actual height value and rocking arm height retention value it
Difference, provides the radial up-down control proportioning valve control voltage needed for rocking arm height correction so that rocking arm actual height is high with rocking arm
The difference of degree retention value is in permissible range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710530721.7A CN107168387B (en) | 2017-07-03 | 2017-07-03 | Rocker arm lifting control method based on rocker arm lifting control system of profile steel saw |
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| CN201710530721.7A CN107168387B (en) | 2017-07-03 | 2017-07-03 | Rocker arm lifting control method based on rocker arm lifting control system of profile steel saw |
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| CN107168387B CN107168387B (en) | 2020-03-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107825427A (en) * | 2017-11-30 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of section steel sawing machine clamping limb control method |
| CN109022754A (en) * | 2018-09-12 | 2018-12-18 | 马鞍山钢铁股份有限公司 | Stepped billet heating furnace moves beam lift cylinder lifting position and keeps control method |
| CN110315140A (en) * | 2019-07-25 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of control method of section steel sawing machine angle steel saw |
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| CN110315140A (en) * | 2019-07-25 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of control method of section steel sawing machine angle steel saw |
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