CN102358055A - Continuous hydraulic forming equipment and automatic control method thereof - Google Patents
Continuous hydraulic forming equipment and automatic control method thereof Download PDFInfo
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- CN102358055A CN102358055A CN201110200436.1A CN201110200436A CN102358055A CN 102358055 A CN102358055 A CN 102358055A CN 201110200436 A CN201110200436 A CN 201110200436A CN 102358055 A CN102358055 A CN 102358055A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 239000003921 oil Substances 0.000 claims description 32
- 238000000748 compression moulding Methods 0.000 claims description 31
- 239000002828 fuel tank Substances 0.000 claims description 22
- 239000010720 hydraulic oil Substances 0.000 claims description 20
- 230000033001 locomotion Effects 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 238000005429 filling process Methods 0.000 claims description 2
- 230000004069 differentiation Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 16
- 239000000843 powder Substances 0.000 description 6
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- 239000000203 mixture Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Abstract
The invention discloses continuous hydraulic forming equipment and an automatic control method thereof. The equipment also comprises an electronic rule, a proximity switch and a proportion integration differentiation (PID) regulator besides an oil tank, an overflow valve, a one-way valve, a reversing valve, a one-way velocity regulating valve, an upper oil cylinder, a lower oil cylinder, an upper pressure rod and a lower pressure rod, wherein the sliding end of the electronic rule is connected with the fixed end of the upper pressure rod; and automatic change of the precession velocity of the upper pressure rod is realized by converting a resistance value at a corresponding position into a current signal, transmitting the current signal to the PID regulator, outputting current quantity to the upper pressure rod and the one-way velocity regulating valve by the PID regulator according to a preset upper pressure rod displacement-time curve, and regulating the opening degree of the valve. In addition, in the continuous hydraulic forming equipment, a programmable controller is used as a controller for the continuous operation of an overall forming process, so that the automatic continuous operation of the overall process including material filling, press forming, rough cast taking and the like is realized; therefore, the equipment is the hydraulic forming equipment which has a simple structure and high automation degree, and of which the precession velocity of the upper pressure rod is not required to be regulated manually.
Description
Technical field
The present invention relates to make the pressure forming machine technical field of material, relate in particular to a kind of continuous hydraulic former and autocontrol method thereof, be applicable to the batch manufacturing processing of powder, particle and block shape metal or inorganic non-metallic product through pressure forming.
Background technology
The manufacture process of metal or inorganic non-metallic product generally includes powder process, moulding, sintering, post processing etc., and wherein moulding process is directly related with the outward appearance and the performance of final products, belongs to the critical process process that product is made.The most frequently used former is various press, according to the difference that produces the pressure mode, mainly is divided into two big types in mechanical press and hydraulic press.Mechanical press is to produce pressure with mechanism driving such as crank connecting link or toggle link, cam, screw rods, and hydraulic press is the machinery that utilizes the liquid pressure transmission, and the liquid that transmits pressure is withstand voltage oil or water.
It has been generally acknowledged that mechanical press is simple in structure, productive temp is fast, efficient is high, be applicable in enormous quantities technologies such as better simply blanking or punch forming processing.And hydraulic press is applicable to small batch production, and shape is changeable, to the more accurate cooked mode of speed, pressure, status requirement of slide block.
The mechanical composition of hydraulic press mainly comprises support frame, Hydraulic Station, oil cylinder, depression bar etc., and wherein all kinds of hydraulic valves of assembling on the Hydraulic Station are connected with oil cylinder through oil pipe, and oil cylinder drives advancing or rollback of depression bar according to the oil-feed direction, thereby produces pressure.
According to the requirement that product is made, the pressing process of hydraulic press can be divided into level pressure, decide two kinds of journeys.Level pressure technology is promptly opened a certain angle through regulating proportional pressure control valve, confirms maximum pressure under this angle, and the operating pressure that press produces in pressing process can not surpass this maximum pressure.Decide journey technology and adopt the mode of closing hydraulic valve near the switch feedback usually, make the depression bar precession behind desired location, stop.Can adopt mechanical type or induction type near switch, depression bar through near the time produce current signal, pass to programmable controller (PLC) earlier after, send out shutdown signal by programmable controller to hydraulic valve again.Can find out, in the processing that is pressed, when the size of formed body is had strict demand, adopt that to decide the journey pressing process more suitable.
Through opening or closing of programmable controller controls reversal valve and hydraulic valve, last down-pressed pole can unidirectional or two-way compacting, and the blank after can suppressing ejects from the fixed mould inner chamber.In addition, the functions such as pneumatic push pedal after vibrations charging, blank that can append with batch bucket ejects further improve the automatization level of hydraulic press.
The patent No. is that the Chinese utility model patent " fully automatic hydraulic powder former " of ZL03227003.8 has disclosed a kind of moulding press, comprises fuselage and mechanism and hydraulic pressure and electric such as be installed in bearing down on one on the fuselage, mould bases, feeding, line sending, cut off; Mould is contained on the mould bases with four leads, and mould bases links with oil cylinder up and down, can be to goods from both direction pressurization up and down, and the other end of mould bases links with the feeding slide plate that is directly promoted and had material-dropping hole by feeding oil cylinder; Add line sending and the hydraulically powered mechanism of cutting off, promptly form automatic brush make-up machine, be mainly used in the dry-pressing formed of industrial powder.
Publication number is the control method for fully automatic that the Chinese invention patent " control method for fully automatic of fully automatic hydroform unit " of CN101229653A has disclosed a kind of fully automatic hydroform unit of tailored powder coal-dust brick, by material adjust automatically, the compacting protection in the pressing process, the automatic cleaning of brick folding device, sign indicating number stack put, the Automatic Control of feeding machine.
But the goods that existing automatic hydraulic press is special to some technological requirement for example need working special-shaped copper or aluminium alloy, just have certain difficulty.The one, pressing speed can't be adjusted automatically, is difficult to process the product of changes of section, can only be through the aperture of manual adjustment fuel tap, and promptly greatly then pressing speed is high for valve opening, but can only definite value control pressing speed height in a compacting process.Therefore, when in pressing process, needing segmentation difference pressing speed, can only adopt midway and shut down, the mode of suppressing again after the artificial adjustment fuel tap aperture causes the whole operation process very loaded down with trivial details.
In addition; Existing automatic type hydraulic press or mechanical press; The mode of blanking after all being to adopt hopper vibrations, balance weighing on the feeding manner; This feeding manner has certain effect for granular powder compacting, but for bigger, the in irregular shape block material of size, makes material block and can't fall at the hopper mouth easily.
Summary of the invention
Technical purpose of the present invention is the deficiency to above-mentioned prior art; A kind of continuous hydraulic former is provided; This equipment can realize that pressing speed controls automatically; Overall processes such as material filling, compression moulding, blank taking-up are moved continuously, thereby satisfy the pressing requirements of each based article, especially satisfy the pressing requirements of the product of processing changes of section.
The present invention realizes that the technical scheme that above-mentioned technical purpose adopts is: a kind of continuous hydraulic former; Form by transport and compression molding device; Material is at first in transport is loaded into mould; Be blank through compression molding device compression moulding then; After the transport folder leaves mould, described compression molding device comprises fuel tank, overflow valve, check valve, reversal valve, unidirectional flow speed control valve, upper cylinder, oil cylinder, upperpush rod and down-pressed pole down, and it is characterized in that: described reversal valve comprises first reversal valve and second reversal valve; Described unidirectional flow speed control valve comprises the first unidirectional flow speed control valve and the second unidirectional flow speed control valve; To upper cylinder and following oil cylinder oiling process, hydraulic oil injects upper cylinder through overflow valve, check valve, first reversal valve and the first unidirectional flow speed control valve from fuel tank, injects oil cylinder down through overflow valve, check valve, second reversal valve and the second unidirectional flow speed control valve; Described compression molding device also comprises electronic ruler, near switch and PID adjuster, on the rollback stroke of described rollback stroke and the down-pressed pole that is installed in upperpush rod near switch, be parked in the fixed position when being used to make upperpush rod or down-pressed pole rollback; Described electronic ruler and upperpush rod match; The sliding end of electronic ruler is connected with the stiff end of upperpush rod, and sliding end is the corresponding different resistance value of diverse location on electronic ruler, under constant voltage, converts current signal into and is sent to the PID adjuster; The PID adjuster is according to this current signal and preset upperpush rod displacement-time curve; To the first unidirectional flow speed control valve output current, the valve opening of the real-time regulated first unidirectional flow speed control valve realizes that the precessional evlocity of upperpush rod changes automatically.
As further optimization; Described down-pressed pole also is provided with electronic ruler and PID adjuster; The sliding end of this electronic ruler is connected with the stiff end of down-pressed pole, and sliding end is the corresponding different resistance value of diverse location on electronic ruler, under constant voltage, converts the PID adjuster that current signal is sent to this down-pressed pole into; The PID adjuster of down-pressed pole is according to this current signal and preset down-pressed pole displacement-time curve; To the second unidirectional flow speed control valve output current, the valve opening of the real-time regulated second unidirectional flow speed control valve realizes that the precessional evlocity of down-pressed pole changes automatically.
Described electronic ruler can adopt raster pattern electronic ruler or resistance-type electronic ruler.
Described near switch can adopt induction type near switch or mechanical type near switch.
Among the present invention, adopt manipulator to carry out the step of material filling and blank taking-up, promptly described transport is made up of major parts such as tong, guide rail and servomotors.Tong is installed on the guide rail, is slided on guide rail by driven by servomotor, and the material of treating compression moulding is clamped to mould or mould is left in the blank clamping of compression moulding.Adopt screw rod or belt to be connected between tong and servomotor.Opening or closing of tong can be adopted pneumatic type or electromagnetic type, promptly by gases at high pressure or electromagnetic mechanism power is provided.According to the movement locus requirement, described guide rail and servomotor are two cover or three covers, overlap and place, and make tong can carry out two dimension or three-dimensional motion.
The controller that a kind of continuous hydraulic former of the present invention adopts programmable controller (PLC) to move continuously as whole forming process; According to preset program; Execution comprises: receive the operation of the opening or closing of feedback signal near switch and PID adjuster, hydraulicdirectional control valve, PID adjuster, to the functions such as servomotor transmission pulse of manipulator, its autocontrol method is specific as follows:
Step 1, material filling:
Start the automatic run switch of continuous hydraulic former, programmable controller sends pulse signal to servomotor, and servomotor drives tong and arrives the correct position that grasps material according to preset movement locus; Then, programmable controller sends shutdown signal to tong, and tong grasps material; Then, the driven by servomotor tong arrives the platform that the mould top falls material to down-pressed pole; At last, tong leaves mould;
The step of step 2, compression moulding:
Starter motor drives plunger displacement pump, and the oiling direction of programmable controller controls first reversal valve is opened, and hydraulic oil is extracted out along the oiling direction from fuel tank through overflow valve, check valve, first reversal valve and the first unidirectional flow speed control valve injected upper cylinder; The downward precession of upperpush rod; The sliding end that the stiff end of upperpush rod drives electronic ruler moves down, and sliding end is the corresponding different resistance value of diverse location on electronic ruler, under constant voltage, converts different current signals into and is sent to the PID adjuster; The PID adjuster is to be started by programmable controller; The preset program that brings into operation after the PID adjuster starts, according to the current signal that receives and preset upperpush rod displacement-time-program(me) to the different big or small magnitudes of current of the first unidirectional flow speed control valve output, the valve opening of the real-time regulated first unidirectional flow speed control valve; The precessional evlocity of upperpush rod then increases valve opening slowly; The precessional evlocity of upperpush rod then reduces valve opening slowly, thereby the precessional evlocity of realizing upperpush rod changes automatically, is blank with material compression moulding;
The displacement of PID adjuster-time-program(me) finishes, and after promptly compacting was accomplished, the PID adjuster sent and feeds back signal to programmable controller; The oil return direction of programmable controller controls first reversal valve is opened then; Hydraulic oil is got back to the fuel tank from upper cylinder, makes the upperpush rod rollback, retreats to when locating near the position of the switch; Send feedback signal to programmable controller near switch; Programmable controller cuts out first reversal valve, and upperpush rod is stopped, and this stop position also is the initial position that next circulation upperpush rod advances;
Then; The oiling direction of programmable controller controls second reversal valve is opened; Hydraulic oil extracted out along the oiling direction from fuel tank through overflow valve, check valve, second reversal valve and the second unidirectional flow speed control valve inject oil cylinder down, the down-pressed pole precession that makes progress ejects mould with blank; Send behind the precalculated position and feed back signal to programmable controller, the down-pressed pole precession that makes progress stops;
Programmable controller is sent out pulse signal, and servomotor drives tong to the mould top according to preset movement locus, takes out top, blank to blowing position, and tong is opened and fallen blank, and tong leaves the blowing position then; The oil return direction of last programmable controller controls second reversal valve is opened; Hydraulic oil is got back to the fuel tank from following oil cylinder, makes the down-pressed pole rollback, when retreating to the locating near the position of the switch of down-pressed pole; Send feedback signal to programmable controller near switch; Programmable controller cuts out second reversal valve, and down-pressed pole is stopped, and this stop position also is the initial position that next circulation down-pressed pole advances;
Above step has been formed the complete process flow of one-time continuous formula shaped by fluid pressure, the program all worked out in advance in steps through programmable controller move in order, whole process need not manual intervention.
Wherein, in the described step 2, the down-pressed pole precession that makes progress; Blank is ejected mould, send behind the precalculated position and feed back signal to programmable controller, in this process; Can adopt method of the prior art; On the precession stroke of down-pressed pole, install near switch, when the down-pressed pole precession extremely should be located near the position of the switch, send feedback signal to programmable controller near switch; Also can adopt the method for PID adjuster control, promptly down-pressed pole also is provided with electronic ruler and PID adjuster, and the sliding end of this electronic ruler is connected with the stiff end of down-pressed pole; Sliding end is the corresponding different resistance value of diverse location on electronic ruler; Under constant voltage, convert the PID adjuster that current signal is sent to this down-pressed pole into, the PID adjuster of down-pressed pole is to be started by programmable controller, and preset program brings into operation after the PID adjuster of down-pressed pole starts; Export the magnitudes of current of different sizes to the second unidirectional flow speed control valve according to the current signal that receives and preset down-pressed pole displacement-time-program(me); The valve opening of the real-time regulated second unidirectional flow speed control valve, the precessional evlocity of down-pressed pole then increase valve opening slowly, and the precessional evlocity of down-pressed pole then reduces valve opening slowly; Thereby the precessional evlocity of realizing down-pressed pole changes automatically; Blank is ejected mould, and when down-pressed pole displacement-time-program(me) end of the PID of down-pressed pole adjuster, the PID adjuster of down-pressed pole sends and feeds back signal to programmable controller.
Compared with prior art; A kind of continuous hydraulic former of the present invention is simple for structure; Fault rate is low, and the valve opening through the unidirectional flow speed control valve of automatic adjusting has realized that pressing speed controls automatically, need not through manual adjustments valve aperture; Thereby satisfy the pressing requirements of each based article, especially satisfy the pressing requirements of the product of processing changes of section; In addition; The present invention preferably adopts manipulator to carry out the material filling and molded blank takes out; Flexible operation and be applicable to difform material, the feeding manner of having avoided existing automatic type hydraulic press or mechanical press to adopt are prone to make bigger, the in irregular shape block material of size be stuck in charging aperture and the problem that can't fall; At last; Continuous hydraulic former of the present invention adopts full automatic technological process; The program operation continuously in order that overall processes such as material filling, compression moulding, blank taking-up are all worked out through programmable controller in advance need not manual intervention, has realized higher automaticity; Can be used for the big bulk material of batch machining size difference, have the high product applicability.
Description of drawings
Fig. 1 is the main composition and the asphalt principle of continuous hydraulic former compression molding device of the present invention;
Fig. 2 is the installation site of the upperpush rod motion related elements of continuous hydraulic former of the present invention;
Fig. 3 is the side view of continuous hydraulic former transport frame for movement of the present invention and motion path;
Fig. 4 is the plane of continuous hydraulic former transport frame for movement of the present invention and motion path;
Fig. 5 is the automatic control sketch map of continuous hydraulic former of the present invention.
The specific embodiment
Embodiment does further explain to the present invention below in conjunction with accompanying drawing, but should not limit protection scope of the present invention with this.
Reference numeral among Fig. 1 to Fig. 5 is: fuel tank 1; Starter motor 2; Plunger displacement pump 3; Overflow valve 4; Check valve 5; First reversal valve 61; Second reversal valve 62; The first unidirectional flow speed control valve 71; The second unidirectional flow speed control valve 72; Upper cylinder 81; Following oil cylinder 82; Upperpush rod 91; Down-pressed pole 92; The stiff end 10 of upperpush rod; Electronic ruler 11; Near switch 12; PID adjuster 13; Programmable controller 14; Servomotor 15; Tong 16; Guide rail 17; Material 18; Mould 19; Blowing position 20.
The continuous hydraulic former is made up of transport and compression molding device, and material 18 at first is loaded into mould 19 through transport, is blank through compression molding device compression moulding then, after transport leaves mould 19 with the blank clamping.
Shown in Figure 1 is the main composition and the asphalt principle of compression molding device, and this compression molding device mainly comprises the unidirectional flow speed control valve of fuel tank 1, starter motor 2, plunger displacement pump 3, overflow valve 4, check valve 5, first reversal valve 61, first 71, upper cylinder 81, oil cylinder 82, upperpush rod 91 and down-pressed pole 92 down.Wherein, proportional pressure control valve 4 is used to limit the peak flow rate (PFR) of hydraulic oil; Check valve 5 is used to limit hydraulic oil along oiling direction one-way flow, prevents to produce oil return; After the oiling direction of programmable controller 14 controls first reversal valve 61 is opened; Hydraulic oil is 1 extraction injection upper cylinder 81 along the oiling direction from fuel tank; The oil return direction of programmable controller 14 controls first reversal valve 61 is opened, and hydraulic oil is got back to the fuel tank 1 from upper cylinder 81; After the oiling direction of programmable controller 14 controls second reversal valve 62 is opened; Hydraulic oil is the following oil cylinder 82 of 1 extraction injection along the oiling direction from fuel tank; The oil return direction of programmable controller 14 controls second reversal valve 62 is opened, and hydraulic oil is got back to the fuel tank 1 from following oil cylinder 82.
As shown in Figure 2, upperpush rod 91 is supporting to have electronic ruler 11, near switch 12 and PID adjuster 13.The sliding end of electronic ruler 11 is connected with the fixed position 10 of upperpush rod 91; Sliding end is the corresponding different resistance value of diverse location on electronic ruler 11; Under constant voltage, convert current signal into and be sent to PID adjuster 13; Export the different big or small magnitudes of current with preset upperpush rod displacement-time-program(me) to the first unidirectional flow speed control valve 71 according to the current signal that receives, the valve opening of the real-time regulated first unidirectional flow speed control valve 71, the precessional evlocity of upperpush rod 91 then increases valve opening slowly; The precessional evlocity of upperpush rod 91 then reduces valve opening slowly, thereby the precessional evlocity of realizing upperpush rod 91 changes automatically.
Equally, down-pressed pole 92 is also supporting to have electronic ruler, near switch and PID adjuster, and its structure is similar with installation site figure with the structure at the upperpush rod place shown in Figure 2 with the installation site.The sliding end of electronic ruler is connected with the fixed position of down-pressed pole 92; Sliding end is the corresponding different resistance value of diverse location on electronic ruler; Under constant voltage, convert the PID adjuster that current signal is sent to this down-pressed pole into; Export the different big or small magnitudes of current with preset down-pressed pole displacement-time-program(me) to the second unidirectional flow speed control valve 72 according to the current signal that receives, the valve opening of the real-time regulated second unidirectional flow speed control valve 72, the precessional evlocity of down-pressed pole 92 then increases valve opening slowly; The precessional evlocity of down-pressed pole 92 then reduces valve opening slowly, thereby the precessional evlocity of realizing down-pressed pole 92 changes automatically.
Fig. 3 and shown in Figure 4 for the frame for movement and the motion path of continuous hydraulic former transport of the present invention.This transport is made up of major parts such as tong 16, guide rail 17 and servomotors 15.Tong 16 is installed on the guide rail 17 and slides, and the slip of tong 16 is driven by servomotor 15,15 of tong 16 and servomotors be connected to screw rod or belt.Opening or closing of tong can be adopted pneumatic type or electromagnetic type, promptly by gases at high pressure or electromagnetic mechanism power is provided.According to the movement locus requirement, overlappable guide rail 17 and servomotor 15 make tong 16 can carry out two dimension or three-dimensional motion.At the material filling stage, tong 16 grasps material 18, and servomotor 15 drives tong 16 and arrives the platform that mould 19 tops fall material 18 to down-pressed pole 92, and tong 16 leaves mould 19 then; After material 18 compression mouldings were blank, servomotor 15 drove tong 16 to mould 19, and the blank that takes out compression moulding falls blank to 20 tops, blowing position, and tong 16 leaves blowing position 20 then.
Shown in Figure 5 for the control principle figure of a kind of continuous hydraulic former of the present invention.The controller that adopts programmable controller 14 to move continuously as whole forming process; Program according to establishment; Execution comprises: receive the feedback signal of sending near switch 12 and PID adjuster 13, send run signal, hydraulicdirectional control valve 61 with 62 open or close, to functions such as servomotor 15 transmission pulses to PID adjuster 13; Realizing the operation continuously automatically of overall processes such as material filling, compression moulding, blank taking-up, below is the complete process flow of one-time continuous formula shaped by fluid pressure.
Step 1, material filling process:
Start the automatic run switch of continuous hydraulic former, programmable controller 14 sends pulse signal to servomotor 15, and servomotor 15 is according to preset movement locus, and the tong 16 of drive installation on guide rail 17 arrives the correct position that grasps material 18; Then, programmable controller 14 sends shutdown signal to tong 16, and tong 16 grasps material 18; Then, servomotor 15 drives tong 16 and arrives the platform that mould 19 tops fall material 18 to down-pressed pole 92; At last, tong 16 leaves mould 19.
Step 2, compression moulding process:
Starter motor 2 drives plunger displacement pump 3, and the oiling direction of programmable controller 14 controls first reversal valve 61 is opened, and with hydraulic oil 1 extraction along the oiling direction from fuel tank, injects upper cylinders 81 through overflow valve 4, check valve 5, first reversal valve 61 and first flow speed control valve 71; Upperpush rod 91 downward precession, the stiff end 10 of upperpush rod 91 drives the sliding end of electronic ruler 11.Sliding end is the corresponding different resistance value of diverse location on electronic ruler 11; Under constant voltage, convert different current signals into and be sent to PID adjuster 13; PID adjuster 13 is exported the magnitudes of current of different sizes to the first unidirectional flow speed control valve 71 according to current signal that receives and preset upperpush rod displacement-time curve; The valve opening of the real-time regulated first unidirectional flow speed control valve 71, promptly precessional evlocity then increases valve opening slowly, and precessional evlocity then reduces valve opening slowly; Thereby the precessional evlocity of realizing upperpush rod 91 changes automatically, is blank with material 18 compression mouldings;
The upperpush rod displacement of PID adjuster 13-time-program(me) finishes, and after promptly compacting was accomplished, PID adjuster 13 sent and feeds back signal to programmable controller 14; The oil return direction of programmable controller 14 controls first reversal valve 61 is opened then; Hydraulic oil is got back to the fuel tank 1 from upper cylinder 81, makes upperpush rod 91 rollbacks, when retreating near switch 12 positions; Send a signal to plc 14 near switch 12; Plc 14 is closed first reversal valve 61, and upperpush rod 91 is stopped, and this stop position also is the initial position that next circulation upperpush rod 91 advances;
Then; The oiling direction of programmable controller 14 control second reversal valve 62 is opened, and hydraulic oil 1 is extracted out through overflow valve 4, check valve 5, second reversal valve 62 and is injected oil cylinder 82 down with the second unidirectional flow speed control valve 72 along the oiling direction from fuel tank, down-pressed pole 92 precession that make progress; Blank is ejected in the process of mould 19; Programmable controller 14 starts the PID adjuster of down-pressed pole, and the preset program that brings into operation after the PID adjuster of this down-pressed pole starts is exported the different big or small magnitudes of current according to the current signal that receives and preset down-pressed pole displacement-time-program(me) to the second unidirectional flow speed control valve 72; The valve opening of the real-time regulated second unidirectional flow speed control valve 72; The precessional evlocity of down-pressed pole 92 then increases valve opening slowly, and the precessional evlocity of down-pressed pole 92 then reduces valve opening slowly, thereby the precessional evlocity of realizing down-pressed pole 92 changes automatically; Blank is ejected mould 19; When down-pressed pole displacement-time-program(me) end of the PID of down-pressed pole adjuster, the PID adjuster of down-pressed pole sends and feeds back signal to programmable controller 14, and the upwards precession of down-pressed pole 92 stops.
14 pulse signals of programmable controller, servomotor 15 drives tong 16 to mould 19 tops according to preset movement locus, takes out blank to 20 tops, blowing position, and tong 16 is opened and is fallen blank, and tong 16 leaves blowing position 20 then; The oil return direction of last programmable controller 14 controls second reversal valve 62 is opened; Hydraulic oil is got back to the fuel tank 1 from following oil cylinder 82, makes down-pressed pole 92 rollbacks, when retreating to the locating near the position of the switch of down-pressed pole 92; Should send feedback signal to programmable controller 14 near switch; Programmable controller 14 cuts out second reversal valve 62, and down-pressed pole 92 is stopped, and this stop position also is the initial position that next circulation down-pressed pole 92 advances.
Above step has been formed the complete process flow of one-time continuous formula shaped by fluid pressure, the program all worked out in advance in steps through programmable controller 14 move in order, whole process need not manual intervention.
Above-mentioned literal specific embodiments of the invention is described; It must be noted that; The content that the present invention comprised is not limited thereto; Under the prerequisite that does not break away from essential scope of the present invention, can do various modifications, replacement and variation, these equivalents belong to the limited range of claims of the present invention equally.
Claims (9)
1. continuous hydraulic former; Form by transport and compression molding device; Material is at first in transport is loaded into mould; Be blank through compression molding device compression moulding then; After the transport folder leaves mould, described compression molding device comprises fuel tank (1), overflow valve (4), check valve (5), reversal valve, unidirectional flow speed control valve, upper cylinder (81), oil cylinder (82), upperpush rod (91) and down-pressed pole (92) down, and it is characterized in that: described reversal valve comprises first reversal valve (61) and second reversal valve (62); Described unidirectional flow speed control valve comprises the first unidirectional flow speed control valve (71) and the second unidirectional flow speed control valve (72); To upper cylinder (81) and following oil cylinder (82) oiling process, hydraulic oil injects upper cylinder (81) through overflow valve (4), check valve (5), first reversal valve (61) and the first unidirectional flow speed control valve (71) from fuel tank (1), injects oil cylinder (82) down through overflow valve (4), check valve (5), second reversal valve (62) and the second unidirectional flow speed control valve (72); Described compression molding device also comprises electronic ruler (11), near switch (12) and PID adjuster (13); On the rollback stroke of described rollback stroke and the down-pressed pole (92) that is installed in upperpush rod (91) near switch (12), be parked in the fixed position when being used to make upperpush rod (91) or down-pressed pole (92) rollback; The sliding end of described electronic ruler (11) is connected with the fixed position (10) of upperpush rod (91); Sliding end is gone up the corresponding different resistance value of diverse location at electronic ruler (11); Under constant voltage, convert current signal into and be sent to PID adjuster (13); PID adjuster (13) is according to this current signal and preset upperpush rod displacement-time curve; To first unidirectional flow speed control valve (71) output current, the valve opening of the real-time regulated first unidirectional flow speed control valve (71) realizes that the precessional evlocity of upperpush rod (91) changes automatically.
2. continuous hydraulic former according to claim 1; It is characterized in that: described down-pressed pole (92) also disposes electronic ruler and PID adjuster; The sliding end of described electronic ruler is connected with the stiff end of down-pressed pole (92), and sliding end is the corresponding different resistance value of diverse location on electronic ruler, under constant voltage, converts the PID adjuster that current signal is sent to described down-pressed pole into; The PID adjuster of down-pressed pole is according to this current signal and preset down-pressed pole displacement-time curve; To second unidirectional flow speed control valve (72) output current, the valve opening of the real-time regulated second unidirectional flow speed control valve (72) realizes that the precessional evlocity of down-pressed pole (92) changes automatically.
3. continuous hydraulic former according to claim 1 and 2 is characterized in that: described electronic ruler is raster pattern electronic ruler or resistance-type electronic ruler.
4. continuous hydraulic former according to claim 1 and 2 is characterized in that: described is induction type near switch or mechanical type near switch near switch (12).
5. continuous hydraulic former according to claim 1 and 2; It is characterized in that: described transport comprises tong (16), guide rail (17) and servomotor (15); Described tong (16) is installed on the guide rail (17); Drive in upward slip of guide rail (17) by servomotor (15), the material of treating compression moulding (18) is clamped to mould (19) or mould (19) is left in the blank clamping after the compression moulding.
6. continuous hydraulic former according to claim 5 is characterized in that: pneumatic type or electromagnetic type are adopted in opening or closing of described tong (16).
7. continuous hydraulic former according to claim 4 is characterized in that: described guide rail (17) and servomotor (15) are two cover or three covers, overlap and place, and make tong (16) carry out two dimension or three-dimensional motion.
8. the autocontrol method of continuous hydraulic former according to claim 1 is characterized in that: by the controller that programmable controller (14) moves as whole forming process continuously, its autocontrol method specifically comprises the steps:
Step 1, material filling process:
Start the automatic run switch of continuous hydraulic former; Programmable controller (14) sends pulse signal to servomotor (15); Servomotor (15) is according to preset movement locus, and the tong (16) of drive installation on guide rail (17) arrives the correct position that grasps material (18); Then, programmable controller (14) sends shutdown signal to tong (16), and tong (16) grasps material (18); Then, servomotor (15) drives tong (16) arrival mould (19) top and falls the platform of material (18) to down-pressed pole (92); At last, tong (16) leaves mould (19);
Step 2, compression moulding process:
The oiling direction of programmable controller (14) control first reversal valve (61) is opened, and with hydraulic oil (1) extraction along the oiling direction from fuel tank, injects upper cylinder (81) through overflow valve (4), check valve (5), first reversal valve (61) with first flow speed control valve (71); Upperpush rod (91) precession downwards; The stiff end (10) of upperpush rod (91) drives the sliding end of electronic ruler (11); Sliding end is gone up the corresponding different resistance value of diverse location at electronic ruler (11); Under constant voltage, convert different current signals into and be sent to PID adjuster (13), PID adjuster (13) is exported the different big or small magnitudes of current, the valve opening of real-time regulated first unidirectional flow speed control valve (71) with preset upperpush rod displacement-time curve to the first unidirectional flow speed control valve (71) according to the current signal that receives; Thereby the precessional evlocity of realizing upperpush rod (91) changes automatically, is blank with material (18) compression moulding;
The displacement of PID adjuster (13)-time-program(me) finishes; PID adjuster (13) sends and feeds back signal to programmable controller (14); The oil return direction of programmable controller (14) control first reversal valve (61) is opened, and hydraulic oil is got back to the fuel tank (1) from upper cylinder (81), makes upperpush rod (91) rollback; When retreating near switch (12) position; Send a signal to plc (14) near switch (12), plc (14) is closed first reversal valve (61), and upperpush rod (91) is stopped;
Then; The oiling direction of programmable controller (14) control second reversal valve (62) is opened; With hydraulic oil along the oiling direction from fuel tank (1) extract out through overflow valve (4), check valve (5), second reversal valve (62) and inject oil cylinder (82) down with the second unidirectional flow speed control valve (72); Upwards precession of down-pressed pole (92) ejects mould (18) with blank, behind the precalculated position, stops;
Step 3, blank take out process:
Programmable controller (14) is sent out pulse signal; Servomotor (15) drives tong (16) to mould (19) top according to preset movement locus; Take out top, blank to blowing position (20), tong (16) is opened and is fallen blank, and tong (16) leaves blowing position (20) then; The oil return direction of last programmable controller (14) control second reversal valve (62) is opened; Hydraulic oil is got back to the fuel tank (1) from following oil cylinder (82); Make down-pressed pole (21) rollback, when retreating to the locating of down-pressed pole, send feedback signal to programmable controller (14) near switch near the position of the switch; Programmable controller (14) cuts out second reversal valve (62), and down-pressed pole (92) is stopped.
9. the autocontrol method of continuous hydraulic former according to claim 8; It is characterized in that: in the described step 2; Upwards precession of down-pressed pole (92); Blank is ejected in the process of mould (18), the PID adjuster of down-pressed pole is exported the different big or small magnitudes of current, the valve opening of real-time regulated second unidirectional flow speed control valve (72) with preset down-pressed pole displacement-time-program(me) to the second unidirectional flow speed control valve (72) according to the current signal that receives; Thereby the precessional evlocity of realizing down-pressed pole (92) changes automatically; When down-pressed pole displacement-time-program(me) end of the PID of described down-pressed pole adjuster, the PID adjuster of this down-pressed pole sends and feeds back signal to programmable controller 14, and the upwards precession of down-pressed pole (92) stops.
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| CN201110200436.1A CN102358055B (en) | 2011-07-15 | 2011-07-15 | Continuous hydraulic forming equipment and automatic control method thereof |
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| CN201110200436.1A CN102358055B (en) | 2011-07-15 | 2011-07-15 | Continuous hydraulic forming equipment and automatic control method thereof |
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| CN102358055B CN102358055B (en) | 2013-11-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103507294A (en) * | 2013-09-28 | 2014-01-15 | 株洲明日硬质合金有限公司 | Method and device for die blockage automatic protection of powder forming machine |
| CN110119098A (en) * | 2018-02-05 | 2019-08-13 | 巢伟林 | A kind of softening press linked system |
| CN111930068A (en) * | 2020-08-20 | 2020-11-13 | 河北工业大学 | Control system of vertical radial extrusion pipe making equipment |
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| US3722366A (en) * | 1971-03-22 | 1973-03-27 | Pacific Press & Shear Corp | Precision anti-whip ram type machine |
| JPH08197157A (en) * | 1995-01-18 | 1996-08-06 | Kazuo Sato | Cooling system for hydraulic locking device of die cushion of press |
| CN101712207A (en) * | 2009-09-08 | 2010-05-26 | 广东工业大学 | High performance and energy-saving double-acting hydrostatic press driven by servo motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3722366A (en) * | 1971-03-22 | 1973-03-27 | Pacific Press & Shear Corp | Precision anti-whip ram type machine |
| JPH08197157A (en) * | 1995-01-18 | 1996-08-06 | Kazuo Sato | Cooling system for hydraulic locking device of die cushion of press |
| CN101712207A (en) * | 2009-09-08 | 2010-05-26 | 广东工业大学 | High performance and energy-saving double-acting hydrostatic press driven by servo motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103507294A (en) * | 2013-09-28 | 2014-01-15 | 株洲明日硬质合金有限公司 | Method and device for die blockage automatic protection of powder forming machine |
| CN110119098A (en) * | 2018-02-05 | 2019-08-13 | 巢伟林 | A kind of softening press linked system |
| CN111930068A (en) * | 2020-08-20 | 2020-11-13 | 河北工业大学 | Control system of vertical radial extrusion pipe making equipment |
| CN111930068B (en) * | 2020-08-20 | 2021-04-06 | 河北工业大学 | Control system of vertical radial extrusion pipe making equipment |
Also Published As
| Publication number | Publication date |
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| CN102358055B (en) | 2013-11-20 |
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