CN107138801B

CN107138801B - Saw control system based on universal impact switch

Info

Publication number: CN107138801B
Application number: CN201710530764.5A
Authority: CN
Inventors: 叶光平; 张昱; 汪志远; 张利明; 黄震; 徐洪; 高凌云; 程良武
Original assignee: Maanshan Iron and Steel Co Ltd
Current assignee: Maanshan Iron and Steel Co Ltd
Priority date: 2017-07-03
Filing date: 2017-07-03
Publication date: 2018-12-25
Anticipated expiration: 2037-07-03
Also published as: CN107138801A

Abstract

The present invention is suitable for hydraulic pressure drive control system technical field, provide a kind of saw control system based on universal impact switch, the system detects section steel sawing machine position by detection switch, such as sawing final position, saw holding fix, the saw that easily breaks down is substituted with this into saw displacement sensor；In addition, the detection for certain web width formed steel sawing final position is opened in each sawing final position detection by the way that the sawing final position of saw is divided into n# sawing final position.For the reliable detection for ensuring sawing final position, corresponding sawing final position detection switch goes wrong fail to examine in the case where, which then uses next sawing final position detection switch as current web width formed steel sawing final position detection switch.

Description

Saw control system based on universal impact switch

Technical field

The invention belongs to hydraulic pressure drive control system technical field more particularly to a kind of saw controls based on universal impact switch System processed.

Background technique

Mainly by saw upper saddle, saw upper saddle driving hydraulic cylinder, (feeding of abbreviation saw is hydraulic for Ma Gang great H profile steel saw Cylinder) and saw clamping arm mechanism etc. constitute, and the saw blade rotating actuator of saw is then placed on saw upper saddle, for The fashioned iron of different size, in order to return to saw can in time after sawed-off fashioned iron, in case there is biggish sawing overtravel in saw And sawing, to the collet of clamping limb, the sawing final position of saw will change with the variation of fashioned iron specification.So in order to realize not The sawing of same specification fashioned iron, usually saw into saw hydraulic cylinder in Linear displacement transducer is installed, with this come detect and control saw The practical supplying position of machine.For section steel sawing machine, working environment is quite severe, in fashioned iron machine during sawing, not only There are dense water mist and a large amount of metal powders to splash around saw saw blade, and saw is sometimes there is also violent vibration, It is easy to cause Linear displacement transducer communicating interrupt, in addition to this, in saw maintenance process, when service personnel is commonly present electric welding Machine improper use, causes Linear displacement transducer to damage.

Summary of the invention

The embodiment of the invention provides a kind of saw control systems based on universal impact switch, it is intended to which solution is mounted on Saw, due to violent vibration, is easy to cause Linear displacement transducer communicating interrupt into saw hydraulic cylinder linear displacement sensor, Or in saw maintenance process, cause Linear displacement transducer to damage due to using electric welding machine improper, and causes saw There is biggish sawing overtravel and sawing to clamping limb collet the problem of.

The present invention provides a kind of saw control system arrived based on universal impact switch, the saw control system packets Include: functional block XJJC03~XJJC37 constitutes the saw sawing final position selecting unit of saw feeding without gap sensors；Functional block XJJC01, XJJC02, XJJC38~XJJC45, XJJC49~XJJC54 and XJJC58~XJJC62 constitute saw feeding without position The saw automatic sawing, cutting control unit of displacement sensor；And functional block XJJC46~XJJC50 and XJJC55~XJJC62 are constituted Control unit is sawed in the manual forward/back of saw, wherein

Need to enter the variation of depth, saw saw blade diameter in saw clamping limb collet when cutting off fashioned iron based on saw saw blade And the depth that saw clamping limb collet allows saw blade to enter, the sawing final position of saw is divided into n fixed point, that is, is divided into n# saw Final position is cut, and is divided into m millimeters between each fixed point, each fixed point is detected by a universal impact switch, due to H-type The web width of steel meets 200+m* (n-1)=800 between 200~800 millimeters, the saw sawing final position selection Unit selects corresponding x# sawing whole according to the current cut type steel web width for sawing of people-machine active station setting when saw control It is opened during into saw by the universal collision of the universal impact switch or x+1# sawing final position of x# sawing final position position Put the detection of row sawing final position into；

Saw is in holding fix, saw main transmission and saw hydraulic and lubricating system is ready, saw clamping limb has pressed from both sides It is tight and in the case that saw roller table speed is zero, after saw control system issues saw automatic sawing, cutting enabling signal, if saw Stop signal and saw without tight in automatic running mode, saw main transmission and saw hydraulic and lubricating system fault-free, saw Cooling water has been opened, and the saw automatic sawing, cutting control unit makes saw hydraulic circuit hydraulic control one-way valve open close control Solenoid directional control valve obtains electric, which opens, meanwhile, exporting a pulse width is ' 1 ' pulse in M second, give saw into/ Moving back saw control proportioning valve and applying a big control voltage makes saw quickly into saw, saw quickly into saw during, work as saw When machine arrival saw sawing start bit or saw quickly reach M seconds into the saw time, saw what control proportioning valve applied to saw forward/back Controlling voltage is zero, the solenoid directional control valve power loss of saw hydraulic circuit hydraulic control one-way valve open close control, and the hydraulic control one-way valve closes It closes, saw will stop quickly operating into saw；Apply one on people-machine active station to saw forward/back saw control proportioning valve later The automatic sawing, cutting control voltage of setting makes saw with certain speed sawing fashioned iron, when saw reaches the saw set into saw sawing When sawing final position, saw automatic sawing, cutting control unit feeds back to saw forward/back saw control based on saw sawing final position selecting unit The control voltage that proportioning valve processed applies is zero, the solenoid directional control valve power loss of saw hydraulic circuit hydraulic control one-way valve open close control, should Hydraulic control one-way valve is closed, and saw will stop sawing, and later, and make the electromagnetism of saw hydraulic circuit hydraulic control one-way valve open close control Reversal valve obtains electric, the hydraulic control one-way valve opening, applies one on people-machine active station to saw forward/back saw control proportioning valve Saw control voltage is moved back in setting, make saw carry out it is fast automatic move back saw, when saw is retreated to saw holding fix, to saw The control voltage that forward/back saw control proportioning valve applies is zero, the electromagnetic switch of saw hydraulic circuit hydraulic control one-way valve open close control Valve power loss, the hydraulic control one-way valve are closed, and saw will stop retreating；

Saw is hydraulic and lubricating system fault-free, saw are without tightly stopping signal and saw is not in maximum sawing position In the case of, saw is issued under manual mode manually into when saw instruction, the manual forward/back saw control unit of saw makes saw hydraulic The solenoid directional control valve of circuit hydraulic control one-way valve open close control obtains electric, the hydraulic control one-way valve opening, meanwhile, it is sawed to saw forward/back It controls proportioning valve and applies a control voltage identical with automatic sawing, cutting, saw is made grasp into saw manually with automatic sawing, cutting speed Make, until saw disappears into saw instruction manually；When sending saw moves back saw instruction manually under manual mode, the manual forward/back of saw Saw control unit makes the solenoid directional control valve of saw hydraulic circuit hydraulic control one-way valve open close control obtain electric, the hydraulic control one-way valve It opens, meanwhile, it is sawed to saw forward/back and controls proportioning valve application one and move back the identical control voltage of saw automatically, make saw with certainly Dynamic saw speed of moving back carries out moving back saw operation manually, disappears until saw moves back saw instruction manually.

The embodiment of the present invention detects sawing final position by universal impact switch, solves since linear displacement passes Sensor is easy to appear failure and causes saw into the problem of sawing failure；In addition, by the way that the sawing final position of saw is divided into n# sawing Final position, each sawing final position detection switch is used for the detection of certain web width formed steel sawing final position, to ensure sawing final position Reliable detection, corresponding sawing final position detection switch goes wrong fail to examine in the case where, which then uses down One sawing final position detection switch is as current web width formed steel sawing final position detection switch, on the basis for ensuring sawed-off fashioned iron On, it reduces to the greatest extent into saw stroke, to save resource.

Detailed description of the invention

Fig. 1 is that hydraulic control system figure is sawed in section steel sawing machine forward/back provided in an embodiment of the present invention；

Fig. 2 is the program structure diagram of section steel sawing machine control system provided in an embodiment of the present invention.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right 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 that hydraulic control system figure is sawed in section steel sawing machine forward/back provided in an embodiment of the present invention, and Fig. 2 is that the present invention is implemented The program structure diagram for the section steel sawing machine control system that example provides only is shown relevant to the embodiment of the present invention for ease of description Part.

As shown in Fig. 2, NSW is " digital change-over switch " functional block, and as I=' 1 ', Y=X2, as I=' 0 ', Y= X1；NCM is " numerical value compares " functional block, and as X1 > X2, QU is ' 1 ', and as X1=X2, QE is ' 1 ', as X1 < X2, QL It is ' 1 '；RSR is " reset terminal R preferential rest-set flip-flop " functional block, and when it is ' 0 ' that S, which is ' 1 ', R, Q is that ' 1 ', QN is ' 0 ', works as S Be ' 1 ', R be ' 1 ' when, Q be that ' 0 ', QN is ' 1 ', when it is ' 0 ' that S, which is ' 0 ', R, Q and QN holding ortho states, be ' 1 ' when S is ' 0 ', R When, Q is that ' 0 ' QN is ' 1 '；MFP is " impulse generator " functional block, when input terminal I becomes ' 1 ' by ' 0 ', when the end Q will export 1 Between length be T direct impulse, and the end Q export direct impulse during, the state change of input terminal I is to the end Q output state No longer have an impact；ETE is " front and back edge is set " functional block, and when input terminal I becomes ' 1 ' by ' 0 ', it is 1 that the end QP, which only exports length, The direct impulse of a cycle period, the end QP remains ' 0 ' state under remaining state.When input terminal I becomes ' 0 ' by ' 1 ', the end QN is only The direct impulse that length is 1 cycle period is exported, the end QN remains ' 0 ' state under remaining state, and OR is disjunction gate, and AND is " with door ", NOT are " NOT gate ".

The saw control system includes: the saw that functional block XJJC03~XJJC37 constitutes saw feeding without gap sensors Sawing final position selecting unit, functional block XJJC01, XJJC02, XJJC38~XJJC45, XJJC49~XJJC54 and XJJC58 The saw automatic sawing, cutting control unit and functional block XJJC46 of~XJJC62 composition saw feeding without gap sensors~ XJJC50 and XJJC55~XJJC62 constitutes the manual forward/back of saw and saws control unit, wherein

Need to enter the variation of depth, saw saw blade diameter in saw clamping limb collet when cutting off fashioned iron based on saw saw blade The depth (about 600 millimeters) that (1.8~2.2 meters) and saw clamping limb collet allow saw blade to enter, can be whole by the sawing of saw Position is divided into n fixed point, that is, is divided into n# sawing final position, and m millimeters are divided between each fixed point, each fixed point is by one ten thousand Can formula impact switch detect, since the web width of H profile steel is between 200~800 millimeters, corresponding 200 milli of 1# sawing final position Rice and formed steel sawing final position below, that is, meet 200+m* (n-1)=800 (unit: mm), saw sawing final position selecting unit root Select corresponding x# sawing whole according to the current cut type steel web width for sawing of people-machine active station (i.e. HMI) setting of saw control Position, during into saw, passes through the universal impact switch of x# sawing final position or the universal impact switch of x+1# sawing final position Carry out the detection of sawing final position, can avoid due to universal impact switch goes wrong in use and it is excessive into saw to cause Situation；

In embodiments of the present invention, total saw final position is divided into 7 fixed points, that is, be divided into for 7 sawing final positions into Row explanation, and each fixed point is detected by a universal impact switch, and corresponding 200 millimeters and below of 1# sawing final position Corresponding 200 millimeters of formed steel sawing final position, 2# sawing final position with corresponding up to 300 millimeters of formed steel sawing final position, 3# sawing final position 300 millimeters to correspond to 400 millimeters up to 400 millimeters of formed steel sawing final position, 4# sawing final position to saw up to 500 millimeters of fashioned iron Corresponding 500 millimeters of final position, 5# sawing final position are cut with 600 millimeters corresponding up to 600 millimeters of formed steel sawing final position, 6# sawing final position To correspond to 700 millimeters up to 800 millimeters of formed steel sawing end up to 700 millimeters of formed steel sawing final position and 7# sawing final position Position, when the current cut type steel web width for sawing of people-machine active station (i.e. HMI) setting of saw control is at 200 millimeters or less When, functional block XJJC04 output end Q could become ' 1 ' state from ' 0 ' state in the saw sawing final position selecting unit, in this way, sawing Machine into during saw, if 1# sawing final position universal impact switch pick up or the failure of 1# sawing final position universal impact switch and not Can pick up, and 2# sawing final position universal impact switch pick up when, functional block XJJC06 in the saw sawing final position selecting unit And XJJC37 output end Q will become ' 1 ' state from ' 0 ' state；When people-machine active station (i.e. HMI) setting of saw control is current Cut type steel web width for sawing 200 millimeters with up to 300 millimeters when, functional block in the saw sawing final position selecting unit XJJC09 output end Q could become ' 1 ' state from ' 0 ' state, in this way, during saw is into saw, if 2# sawing final position universal is touched Rush open pass pick up or the failure of 2# sawing final position universal impact switch and fail to pick up and 3# sawing final position universal impact switch Pick up when, functional block XJJC11 and XJJC37 output end Q will become ' 1 ' from ' 0 ' state in the saw sawing final position selecting unit State；When saw control people-machine active station (i.e. HMI) setting current cut type steel web width for sawing 300 millimeters with up to At 400 millimeters, functional block XJJC14 output end Q could become ' 1 ' state from ' 0 ' state in the saw sawing final position selecting unit, this Sample, during saw is into saw, if 3# sawing final position universal impact switch pick up or 3# sawing final position universal impact switch Fail and fail to pick up and 4# sawing final position universal impact switch pick up when, functional block in the saw sawing final position selecting unit XJJC16 and XJJC37 output end Q will become ' 1 ' state from ' 0 ' state；When people-machine active station (i.e. HMI) setting of saw control Current cut type steel web width for sawing 400 millimeters with up to 500 millimeters when, function in the saw sawing final position selecting unit Block XJJC19 output end Q could become ' 1 ' state from ' 0 ' state, in this way, during saw is into saw, if 4# sawing final position universal Impact switch pick up or the failure of 4# sawing final position universal impact switch and fail to pick up and the collision of 5# sawing final position universal is opened Pass pick up when, functional block XJJC21 and XJJC37 output end Q will be become from ' 0 ' state in the saw sawing final position selecting unit ' 1 ' state；When the current cut type steel web width for sawing of people-machine active station (i.e. HMI) setting of saw control is at 500 millimeters or more When to 600 millimeters, functional block XJJC24 output end Q could become ' 1 ' state from ' 0 ' state in the saw sawing final position selecting unit, In this way, during saw is into saw, if 5# sawing final position universal impact switch pick up or the collision of 5# sawing final position universal open Close failure and fail to pick up and 6# sawing final position universal impact switch pick up when, function in the saw sawing final position selecting unit Block XJJC26 and XJJC37 output end Q will become ' 1 ' state from ' 0 ' state；When people-machine active station (i.e. HMI) of saw control is set Fixed current cut type steel web width for sawing 600 millimeters with up to 700 millimeters when, function in the saw sawing final position selecting unit Can block XJJC29 output end Q ' 1 ' state could be become from ' 0 ' state, in this way, during saw is into saw, if 6# sawing final position is omnipotent Formula impact switch pick up or the failure of 6# sawing final position universal impact switch and fail to pick up and 7# sawing final position universal is collided Switch pick up when, functional block XJJC31 and XJJC37 output end Q will be become from ' 0 ' state in the saw sawing final position selecting unit ' 1 ' state；When the current cut type steel web width for sawing of people-machine active station (i.e. HMI) setting of saw control is at 700 millimeters or more When to 800 millimeters, functional block XJJC34 output end Q could become ' 1 ' state from ' 0 ' state in the saw sawing final position selecting unit, In this way, during saw is into saw, if 7# sawing final position universal impact switch pick up or the collision of 7# sawing final position universal open It closes failure and fails to pick up, and saw maximum feeding position (position and 7# sawing final position are at a distance of 100 millimeters) universal is collided Switch pick up when, functional block XJJC36 and XJJC37 output end Q will be become from ' 0 ' state in the saw sawing final position selecting unit ' 1 ' state.

For Ma Gang great H profile steel saw, in order to realize saw pair in the case where saw does not use displacement sensor into saw The automatic sawing, cutting of different size fashioned iron is provided with saw into the saw for sawing without gap sensors in section steel sawing machine control program Automatic sawing, cutting control unit.Saw is in holding fix, saw main transmission and saw hydraulic and lubricating system is ready, saw folder In the case that gripping arm has clamped and saw roller table speed is zero, saw control system issues saw automatic sawing, cutting enabling signal Afterwards, if saw stops signal without tight in automatic running mode, saw main transmission and saw hydraulic and lubricating system fault-free, saw And saw cooling water has been opened, then functional block XJJC39 output end Q will be by ' 0 ' in the saw automatic sawing, cutting control unit State becomes ' 1 ' state, thus makes functional block XJJC60 output end Q that will become ' 1 ' state from ' 0 ' state, the saw into saw hydraulic circuit (such as Shown in figure 1 above) solenoid directional control valve (LSHF) of hydraulic control one-way valve open close control it is electric, which opens, while function Block XJJC40 output end Q will export ' 1 ' pulse that a pulse width is M seconds (such as 2 seconds), functional block XJJC42 output end Q It will become ' 1 ' state from ' 0 ' state, functional block XJJC43 output end Y will apply one to saw forward/back saw control proportioning valve (JJKBF) A biggish control voltage (such as 6V) makes saw quickly into saw, saw quickly into saw during, when saw reaches saw saw Cut start bit or saw quickly into saw the time reach M seconds when, functional block XJJC42 output end Q will become ' 0 ' state from ' 1 ' state, this Sample, it is zero that functional block XJJC43 output end Y, which saws the control voltage that control proportioning valve applies to saw forward/back, saw hydraulic circuit Solenoid directional control valve (LSHF) power loss of hydraulic control one-way valve open close control, the hydraulic control one-way valve are closed, and saw will stop quickly into saw Operation.Saw quickly into saw finish after, functional block XJJC45 and XJJC49 output end Q will become ' 1 ' state from ' 0 ' state, As a result, functional block XJJC50 output end Y to saw forward/back saw control proportioning valve apply an operative employee people-machine active station (i.e. HMI automatic sawing, cutting control voltage (such as 2V) set on) makes saw with certain speed sawing fashioned iron.When saw is arrived into saw sawing Up to setting saw sawing final position when, functional block XJJC37 output end Q will be become from ' 0 ' state in saw sawing final position selecting unit Thus ' 1 ' state makes functional block XJJC38 output end Q in saw automatic sawing, cutting control unit that will become ' 1 ' state, function from ' 0 ' state Block XJJC39, XJJC45 and XJJC49 output end Q will become ' 0 ' state from ' 1 ' state, in this way, functional block XJJC50 output end Y gives The control voltage that saw forward/back saw control proportioning valve applies is zero, the electromagnetism of saw hydraulic circuit hydraulic control one-way valve open close control Reversal valve (LSHF) power loss, the hydraulic control one-way valve are closed, and saw will stop sawing, meanwhile, it is incited somebody to action in functional block XJJC53 output end Q ' 1 ' pulse of one N milliseconds (such as 300 milliseconds) is exported, so that functional block XJJC54 and XJJC60 output end Q will be by ' 0 ' state Become ' 1 ' state, the solenoid directional control valve (LSHF) of the saw hydraulic circuit hydraulic control one-way valve open close control obtains electric, the fluid-control one-way Valve is opened, while functional block XJJC58 output end Q will be become ' 1 ' state from ' 0 ' state, and functional block XJJC59 output end Y will give saw Forward/back saw control proportioning valve (JJKBF) applies the saw that moves back that an operative employee sets on people-machine active station (i.e. HMI) and controls electricity Pressure (as -5V), make saw carry out it is fast automatic move back saw, when saw is retreated to saw holding fix, functional block XJJC51 is exported End Q will be become ' 1 ' state from ' 0 ' state, and functional block XJJC54, XJJC58 and XJJC60 output end Q will become ' 0 ' state from ' 1 ' state, It is zero that functional block XJJC59 output end Y, which saws the control voltage that control proportioning valve applies to saw forward/back, as a result, saw hydraulic time Solenoid directional control valve (LSHF) power loss of road hydraulic control one-way valve open close control, the hydraulic control one-way valve are closed, and saw will stop retreating, So far, saw automatic sawing, cutting finishes.

For the ease of saw maintenance and accident treatment, it is manual that saw is provided in the section steel sawing machine SAWING CONTROL program Control unit is sawed in forward/back.Saw is hydraulic and lubricating system fault-free, saw are without tightly stopping signal and saw is not in most pit saw In the case where cutting position, operative employee issues saw manually into when saw instruction under manual mode, and the manual forward/back saw of the saw controls Functional block XJJC48, XJJC49 and XJJC60 output end Q will become ' 1 ' state from ' 0 ' state in unit, hydraulic time of saw as a result, The solenoid directional control valve (LSHF) of road hydraulic control one-way valve open close control obtains electric, hydraulic control one-way valve opening, meanwhile, functional block XJJC62 output end Y give saw forward/back saw control proportioning valve apply a control voltage identical with automatic sawing, cutting, make saw with Automatic sawing, cutting speed operate manually into saw, until saw disappears into saw instruction manually.Saw is hydraulic and lubricating system Without tightly signal is stopped and saw is not in the case where maximum going-back position, operative employee issues under manual mode for fault-free, saw When saw moves back saw instruction manually, functional block XJJC57, XJJC58 and XJJC60 are defeated in the manual forward/back saw control unit of the saw Outlet Q will become ' 1 ' state from ' 0 ' state, as a result, the solenoid directional control valve of saw hydraulic circuit hydraulic control one-way valve open close control (LSHF) electric, hydraulic control one-way valve opening is obtained, meanwhile, functional block XJJC61 output end Y saws control proportioning valve to saw forward/back and applies Add one to saw identical control voltage with automatic move back, makes saw to move back saw speed automatically and carry out moving back to saw manually operating, until saw Saw instruction is moved back manually to disappear.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims

1. A saw machine control system based on a universal collision switch, characterized in that, the saw machine control system includes: function blocks XJJC03～XJJC37 form a saw machine sawing end position selection unit without a displacement sensor for saw machine feed; Function blocks XJJC01, XJJC02, XJJC38～XJJC45, XJJC49～XJJC54 and XJJC58～XJJC62 constitute the saw machine automatic sawing control unit without displacement sensor for saw feed; and function blocks XJJC46～XJJC50 and XJJC55～XJJC62 constitute saw machine manual feed/ Back sawing control unit, wherein,

Based on the depth that the saw blade of the saw machine needs to enter into the clip of the clamping arm of the saw machine when cutting the section steel, the change of the diameter of the saw blade of the saw machine, and the depth that the clamping arm clamp of the saw machine allows the saw blade to enter, the sawing end position of the saw machine is adjusted. It is divided into n fixed points, that is, it is divided into n# sawing end positions, and the interval between each fixed point is m mm. Each fixed point is detected by a universal collision switch. The web width of H-shaped steel is 200-800 Between millimeters, the 1# sawing end position corresponds to the section steel sawing end position of 200 mm or less, that is, 200+m*(n-1)=800, and the sawing end position selection unit of the saw machine is based on the Select the x# sawing end position corresponding to the current width of the steel web to be sawed set by the man-machine operation station controlled by the control station. During the sawing process, use the universal collision switch of the x# sawing end position or x+1# saw The universal collision switch at the cutting end position is used to detect the sawing end position;

With the saw in the waiting position, the main drive of the saw and the hydraulic and lubrication systems of the saw ready, the clamping arms of the saw clamped and the speed of the saw rollers at zero, the saw control system sends out an automatic saw cut. After starting the signal, if the saw machine is in the automatic operation mode, the main drive of the saw machine and the hydraulic and lubrication system of the saw machine are not faulty, the saw machine has no emergency stop signal and the cooling water of the saw blade of the saw machine has been turned on, the automatic sawing control of the saw machine The unit energizes the electromagnetic reversing valve controlled by the hydraulic control check valve opening/closing of the hydraulic circuit of the saw machine. / Back-saw control proportional valve applies a large control voltage to make the sawing machine fast forward sawing. In the process of sawing machine fast forwarding sawing, when the sawing machine reaches the sawing start position of the sawing machine or the sawing machine fast forwarding time reaches M seconds , the control voltage applied to the forward/backward saw control proportional valve of the saw machine is zero, the electromagnetic reversing valve controlled by the hydraulic control check valve open/close in the hydraulic circuit of the saw machine loses power, the hydraulic control check valve is closed, and the saw machine It will stop the fast forward sawing operation; then apply an automatic sawing control voltage set on the man-machine operation station to the forward/backward sawing control proportional valve of the sawing machine to make the sawing machine cut the section steel at a certain speed, when the sawing machine enters When the sawing reaches the set sawing end position of the sawing machine, the automatic sawing control unit of the sawing machine based on the feedback from the sawing end position selection unit of the sawing machine will apply a control voltage to the proportional valve of the forward/backward sawing control of the sawing machine to be zero. The electromagnetic reversing valve controlled by the hydraulic control one-way valve of the saw machine hydraulic circuit is de-energized, the hydraulic control one-way valve is closed, the saw machine will stop sawing, and then the hydraulic control one-way valve of the saw machine hydraulic circuit is opened The electromagnetic reversing valve of the /close control is energized, the hydraulic control check valve is opened, and a sawing control voltage set on the man-machine operation station is applied to the forward/backward sawing control proportional valve of the sawing machine, so that the sawing machine Perform fast and automatic sawing back. When the sawing machine moves back to the waiting position of the sawing machine, the control voltage applied to the proportional valve of the forward/backward sawing control of the sawing machine is zero, and the electromagnetic switch controlled by the hydraulic control check valve of the hydraulic circuit of the sawing machine is switched on and off. When the power to the valve is lost, the hydraulically controlled one-way valve is closed, and the saw machine will stop moving backwards;

When the hydraulic pressure and lubrication system of the saw machine is faultless, the saw machine has no emergency stop signal, and the saw machine is not at the maximum cutting position, when the saw machine manually enters the saw command in the manual mode, the saw machine manually advances/retreats the saw The control unit energizes the electromagnetic reversing valve controlled by the hydraulic control check valve on/off of the hydraulic circuit of the saw machine, and the hydraulic control check valve is opened. Cut the same control voltage, so that the saw machine can perform manual sawing operation at the automatic sawing speed until the manual sawing command of the saw machine disappears; The unit makes the electromagnetic reversing valve controlled by the hydraulic control one-way valve open/close in the hydraulic circuit of the saw machine energized, and the hydraulic control one-way valve is opened. The same control voltage enables the saw machine to perform manual sawing operation at the automatic sawing speed until the manual sawing command of the saw machine disappears.