CN1727699A - Proportional direct driving system in hydraulic machine for warm cold extrusion - Google Patents
Proportional direct driving system in hydraulic machine for warm cold extrusion Download PDFInfo
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- CN1727699A CN1727699A CN 200410020221 CN200410020221A CN1727699A CN 1727699 A CN1727699 A CN 1727699A CN 200410020221 CN200410020221 CN 200410020221 CN 200410020221 A CN200410020221 A CN 200410020221A CN 1727699 A CN1727699 A CN 1727699A
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Abstract
The present invention relates to a warm-cold extrusion hydraulic press proportional direct-driving system. Said system includes the following components: dead-weight quick falling block, main cylinder, pump outlet valve block, liftout valve block, liftout cylinder, proportional pump, oil tank, plug-in components, electromagnetic valves and control device. Said invention also provides their connection mode. Said invention is applicable to tension process of various materials and forms.
Description
Technical field
The invention belongs to the hydraulic machinery technical field, particularly relate to the straight drive system of a kind of temperature cold extrusion hydraulic press ratio.
Background technique
The cold hydraulic press of present known temperature will be realized the requirement of its technology, and particularly in the big quality of control or when high-speed, with common solenoid valve and pump, the unexpected Brake Energy of load causes in system disadvantageous pressure spike of long-term behaviour and impact.System lacks flexible, if must change the stop position of final controlling element, then must actually change position limit switch or near switch or near the position of switch.Several if desired stop positions, then each position all needs a position limit switch to add the switch logic supporting with it, complex structure, hydraulic press cost height.
Summary of the invention
The present invention provides a kind of temperature cold extrusion hydraulic press ratio straight drive system for solving the technical problem that exists in the known technology.The present invention seeks to the proportion of utilization control technique, realization pressure, speed are in very large range adjusted, and satisfy warm cold extrusion hydraulic press to various material stretching extrusion process needs.
Modern industry is produced, the stretching autofrettage is applicable to the plate parts of various materials, be processed into different shape, as special-shaped part required in the industries such as box-like and automobile, space flight, aviation etc., lines are attractive in appearance, smooth, required deformation force when making simultaneously, strain rate complexity, its speed can in very large range be adjusted, so that adapt to the stretching process of various materials and different shape.Traditional pressure regulation and build fast mode and obviously can not adapt to its high request must be adopted the proportional control technology, can control its parameter by control distance adjustment electrical signal far away because of it, therefore, can satisfy various processing needs.
The straight drive system of temperature cold extrusion hydraulic press ratio of the present invention comprises: deadweight fast piece, ejecting valve block, pump discharge valve piece and dosing pump group down.The fast piece down of deadweight---the integrated package formed by a plurality of solenoid valves and cartridge valve with slide block down and backhaul conversion function.Ejecting valve block---have stretching, eject the integrated package of function by what a plurality of solenoid valves and cartridge valve were formed.Pump discharge valve piece---by having that a plurality of solenoid valves and cartridge valve are formed to ejecting valve block and the fast integrated package of piece flow rate distribution down of deadweight.
The Proportional valve that the present invention adopts can be controlled the position of spool in valve body by changing electromagnet coil current.This provides the electrical control to the final controlling element speed of the flow that passes through valve.This valve needs variable electromagnet current, and this electric current can be realized by powering to electromagnet from the variable voltage of potentiometer under the simplest situation.Because the motion of spool is controlled with electric approach rather than with hydraulic method, it will not be subjected to the influence of oil viscosity and pilot pressure variation and so on factor.Therefore, to final controlling element speed can be more definite control.Can control the acceleration of final controlling element and retardation exactly with the impact that reduces system and mechanism kinematic stably is provided, and provide reliable mode for the control far away of press.Dosing pump of the present invention, improved the efficient of system, pump only produces required flow under induced pressure, avoided the pressure drop on the relief valve, heating value is significantly reduced, for the bigger system of flow, dosing pump only needs a rill metered valve to remove the control piston of operating pumps, needn't determine that specification removes to deal with system's full flow greatly.When the dosing pump electric current hour, the flow of pump will automatically reduce near the required flow.
The present invention can realize the sequence of movement of warm cold extrusion hydraulic press:
1. slide block is descending fast
Connect electrical control instruction, this moment, dosing pump came oil to enter the master cylinder epicoele, and master cylinder cavity of resorption fluid flows back to fuel tank simultaneously, liquid-filling valve under the self-priming state to the oil cylinder repairing.At this moment, top slide block is in quick downstream state.
2. slide block is descending at a slow speed
When top slide block comes downwards to the retarding travel switching position (this position can be adjusted arbitrarily), fuel outlet valve, liquid-filling valve are closed, cavity of resorption oil can only be by supporting valve oil sump tank (setting pressure of supporting valve is not slipped down to well when static with slide block, and is unsuitable too high), the descending at a slow speed action of slide block do this moment.
3. the slide block compacting is descending
When the mould contact workpiece, make master cylinder pressure be elevated to a setting value (this force value is low more good more, as long as pressure transmitter energy sender), the time relay is started working (delay time is adjustable), at this moment the top slide block persistent pressure.
4. top slide block pressure release
When delaying time when time is up, liquid-filling valve is opened under the effect of control oil--and-hydraulic press automatical control system sends instruction, earlier the pressure oil of master cylinder epicoele is passed through the liquid-filling valve pressure release of oil cylinder epicoele.
5. top slide block snap back
Arrive constantly when the slide block pressure release, automatical control system sends instruction, and the fluid of pump enters master cylinder backhaul chamber by pump discharge valve piece and the fast piece down of deadweight.
6. slide block backhaul deceleration, bottom slide block (hydraulic die cushion) eject
When top slide block backhaul during to the retarding travel position, pump comes an oily part to enter the master cylinder epicoele, and a part enters liftout tank by angled slide block, and slide block backhaul deceleration this moment, bottom slide block (hydraulic die cushion) eject.
7. the top slide block backhaul stops, bottom slide block continues to eject
When backhaul during to upper limit, the top slide block backhaul stops, and bottom slide block continues to eject, and the tensioning member demoulding returns to original position then.
In whole process, but its pressure passing ratio relief valve set, its flow changes by the pivot angle size of control pump.
The technological scheme that the straight drive system of the present invention's temperature cold extrusion hydraulic press ratio is taked is:
The straight drive system of temperature cold extrusion hydraulic press ratio, constitute by control gear, solenoid valve, oil circuit, be characterized in: the fast piece (4) down of deadweight is connected with pump discharge valve piece (8) with master cylinder (3), ejecting valve block (10) is connected with pump discharge valve piece (8) with liftout tank (11), and pump discharge valve piece (8) is connected with dosing pump (7); The fast piece (4) down of deadweight is made up of 6 plug-in units and 3 solenoid valves, 6 plug-in units are connected with 3 solenoid valves respectively, pump discharge valve piece (8) oil circuit is connected with master cylinder (3) epicoele through plug-in unit (b5), pump discharge valve piece (8) oil circuit links to each other with master cylinder (3) cavity of resorption through plug-in unit (b4, b3), and pump discharge valve piece (8) oil circuit is connected with fuel tank through plug-in unit (b4, b1, b2); Pump discharge valve piece (8) is made up of 6 plug-in units and 4 solenoid valves, 6 plug-in units are connected with 4 solenoid valves, dosing pump (7) oil circuit communicates with fuel tank through the safety valve that plug-in unit (a1, a6) constitutes, the directional control valve that constitutes through plug-in unit (a2, a3) and plug-in unit (a4, a5) respectively with ejecting valve block (10) and under conducting oneself with dignity soon piece (4) be connected; Ejecting valve block (10) is made up of 4 plug-in units and 2 solenoid valves, 4 plug-in units are connected with 2 solenoid valves, pump discharge valve piece (8) oil circuit is connected with liftout tank (11) through plug-in unit (c2), pump discharge valve piece (8) oil circuit is connected with fuel tank through plug-in unit (c3), and the oil circuit that links to each other with liftout tank (11) ejects Proportional valve through plug-in unit (c1) and is connected with fuel tank; Solenoid valve is connected with control gear.
Hydraulic press of the present invention can also adopt following technical measures:
The straight drive system of described temperature cold extrusion hydraulic press ratio, be characterized in: master cylinder epicoele oil circuit is connected with liquid-filling valve, pressure frequency variator, and liquid-filling valve links to each other with control gear with the pressure frequency variator.
The straight drive system of described temperature cold extrusion hydraulic press ratio, be characterized in: top slide block is equipped with upper limit journey parts, and liftout tank is equipped with lower limit journey parts, and limit journey parts link to each other with control gear.
The straight drive system of described temperature cold extrusion hydraulic press ratio is characterized in: the oil circuit that the fast piece down of deadweight links to each other with the master cylinder epicoele is connected with proportional pressure control valve, and proportional pressure control valve links to each other with control gear.
The straight drive system of described temperature cold extrusion hydraulic press ratio is characterized in: on ejecting valve block and the oil circuit that liftout tank links to each other the pressure frequency variator is housed, the pressure frequency variator links to each other with control gear.
Advantage and good effect that the present invention has are:
The present invention is applicable to the stretching process of various materials and different shape, and the plate parts of various materials is stretched manufactures different shape, and as special-shaped part required in the industries such as box-like and automobile, space flight, aviation etc., lines are attractive in appearance, smooth.Adopt the proportional control technology, can regulate electrical signal by control far away and control its parameter, therefore, to final controlling element speed can be more definite control.Be not subjected to oil viscosity and pilot pressure to change and so on the influence of factor, control the acceleration of final controlling element and retardation exactly with the impact that reduces system and mechanism kinematic stably is provided.Dosing pump among the present invention has effectively improved the efficient of system.
Description of drawings
Fig. 1 is the straight drive system structural representation of the present invention's temperature cold extrusion hydraulic press ratio.
Among the figure: 1. upper limit journey parts, 2. liquid-filling valve, 3. master cylinder, 4. automatically fast piece down, 5. the pressure frequency variator, 6. proportional pressure control valve, 7. the dosing pump group, 8. pump discharge valve piece, 9. eject Proportional valve piece, 10. ejecting valve block, 11. liftout tanks, 12. lower limit journey parts.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1.
The straight drive system of temperature cold extrusion hydraulic press ratio is made of deadweight fast piece 4, ejecting valve block 10, pump discharge valve piece 8 and dosing pump group 7 down.The fast piece 4 down of deadweight is connected with pump discharge valve piece 8 with master cylinder 3, and ejecting valve block 10 is connected with pump discharge valve piece 8 with liftout tank 11, and pump discharge valve piece 8 is connected with dosing pump group 7.
1, the fast piece 4 down of deadweight: the fast piece 4 down of deadweight is made up of 6 plug-in units and 2 two-position four-way magnetic slide valves and 1 ball valve.6 plug-in units are connected with solenoid valve respectively, and pump discharge valve piece 8 oil circuits are connected with master cylinder 3 epicoeles through 1 plug-in unit b5, and pump discharge valve piece 8 oil circuits link to each other with master cylinder 3 cavity of resorptions through plug-in unit b4, b3, and pump discharge valve piece 8 oil circuits are connected with fuel tank through plug-in unit b4, b1, b2; Top slide block is equipped with upper limit journey parts 1, and master cylinder 3 epicoele oil circuits are connected with liquid-filling valve 2, pressure frequency variator 5-1 and proportional pressure control valve 6.Solenoid valve, pressure frequency variator 5-1 link to each other with control gear with proportional pressure control valve 7.
The fast piece 4 down of deadweight: plug-in unit b1 and electromagnet B-1 form one group of fuel outlet valve, and when B-1 switched on, the oil of master cylinder cavity of resorption can free surface flow oil sump tank (by the b1 plug-in unit).When B-1 cuts off the power supply (shown position), the b2 plug-in unit is closed, and the oil of master cylinder cavity of resorption can only pass through b2 plug-in unit (supporting valve) oil sump tank.Be action down slowly at this moment.B4, b5 plug-in unit and electromagnet B-2 form a selector valve.At shown position, pump comes oil to enter main chamber cavity of resorption by the b4 plug-in unit, and when electromagnet B-2 switched on, the b4 plug-in unit was closed, and pump comes oil to enter the master cylinder epicoele through b5 plug-in unit (YA1 energising this moment).B6 plug-in unit and YA1 electromagnet are formed the pressure regulator valve of master cylinder, by regulating the size of current of YA1, can change the pressure size of master cylinder.B3 plug-in unit and electromagnet B-3 function are to slip under the limited slip block.
The fast function of piece 4 down of deadweight is: when B-1, B-2, B-3 adhesive, slide block soon down.When B-2, B-3 adhesive, because of its fuel outlet valve cuts out, the oil of master cylinder cavity of resorption can only overcome the pressure oil sump tank of sequence valve, realizes slide block action down slowly.When 3 solenoid valves all cut off the power supply, pump came oil can make the slide block backhaul.
Upper limit journey parts 1: mainly form by parts such as position limit switch, run-length encoding device, gear rack speed reduceres.When press motion, thereby the motion of driven gear tooth bar makes the transmission of run-length encoding device, is transferred to control gear, can adjust stroke range by button.
Liquid-filling valve 2: liquid-filling valve 2 is installed in master cylinder 3 bottoms, and it act as: quick when descending when slide block, master cylinder 3 epicoeles form negative pressure, inhale and drive liquid-filling valve 2 from the fuel tank repairing.When the slide block backhaul, its pilot pressure P1 opens the control mouth of liquid-filling valve 2, thereby makes the oil of master cylinder 3 bottoms flow back to fuel tank by liquid-filling valve 2.
Master cylinder 3: be installed between the upper beam and slide block of hydraulic press.
Pressure frequency variator 5: pressure responsive element, transmit pressure signal to control gear.
Proportional pressure control valve 6: be installed on the cover plate of 1 pressure plug-in unit on the fast automatically piece down.When the pressure of system need be adjusted,, realize the pressure size variation of system by adjusting the openings of sizes that secondary meter (or touch screen) on the control panel can change valve.
2, ejecting valve block 10: ejecting valve block 10 is made up of 4 plug-in units and 2 two-position four-way solenoid valves, 4 plug-in units are connected with 2 solenoid valves, pump discharge valve piece 8 oil circuits are connected with liftout tank 11 through plug-in unit c2, pump discharge valve piece 8 oil circuits are connected with fuel tank through plug-in unit c3, and the oil circuit that links to each other with liftout tank 11 ejects Proportional valve through plug-in unit c1 and is connected with fuel tank.Liftout tank 11 is equipped with lower limit journey parts 12.On ejecting valve block 10 and the oil circuit that liftout tank 11 links to each other pressure frequency variator 5-2 is housed.Solenoid valve, limit journey parts 12, pressure frequency variator 5-2 link to each other with control gear.
Ejecting valve block: the c4 plug-in unit is a safety valve, c1 plug-in unit and eject Proportional valve piece 9 and finish voltage regulation function jointly.The function of C-2 electromagnet and c2 plug-in unit is to guarantee that liftout tank does not slip down in state of rest.Fuel outlet valve of the common composition of C-3 solenoid valve and c3 plug-in unit, when liftout tank was return, the oil in the cylinder was through c2, c3 plug-in unit oil sump tank.When liftout tank stretches as hydraulic die cushion, can regulate the size of YA2 and control pressure-pad-force (oil is through the c1 oil sump tank in the liftout tank, and at this moment, C-2, C-3 cut off the power supply) by allowing the C-1 energising, when liftout tank jack-up, pump comes oil to enter liftout tank through the c2 plug-in unit.Its function is, when C-2, C-3 cut off the power supply, pump came oil directly to enter liftout tank 11 to eject, and when C-2, C-3 switched on, liftout tank was return.
Eject Proportional valve piece 9: form by 1 ball valve and 1 proportional pressure control valve.Be installed in the place of close ejecting valve block 10 in the power system.During the C-1 adhesive, can adjust the pressure size of liftout tank by touch screen.
Liftout tank 11: be installed on the hydraulic press bottom end rail.
Lower limit journey parts 12: its structure is installed in bottom end rail bottom with upper limit journey parts 1, links to each other with liftout tank 11 by support.
3, pump discharge valve piece 8: pump discharge valve piece 8 is made up of 6 plug-in units and 4 two-position four-way solenoid valves, 6 plug-in units are connected with 4 two-position four-way solenoid valves, dosing pump group 7 oil circuits communicate with fuel tank through the safety valve that plug-in unit a1, a6 constitute, and are connected with piece 4 under ejecting valve block 10 and deadweight are fast respectively through directional control valve that plug-in unit a2, a3 and plug-in unit a4, a5 constitute; Solenoid valve is connected with control gear.
The structure of pump discharge valve piece 8: plug-in unit a1 and electromagnet A-1 form one group of safety valve.When A-1 cut off the power supply, pump came oil through plug-in unit a1 oil sump tank, and its safety pressure is adjustable, can regulate its pressure size by regulating the relief valve of installing on the cover board.Promptly when A-1 switches on, if system pressure surpasses minimum setting pressure of relief valve, but automatic overflow.A6 plug-in unit and electromagnet A-4 form one group of safety valve, and its function is identical with A-1.The shared electromagnet A-2 of a2 and a3 plug-in unit.In shown position, electromagnet is not switched on, and pump comes oil to flow to the fast piece down of deadweight (prerequisite is A-1, the energising of A-4 electromagnet) by the a3 plug-in unit, when A-2 switches on, pump comes oil to flow to ejecting valve block by the a2 plug-in unit, and promptly a2, a3 plug-in unit and electromagnet A-2 form selector valve.A4, the same a2 of a5 pin function, a3 plug-in unit.
4, its function is: when 4 solenoid valves all cut off the power supply, pump came oil by the direct oil sump tank of overflow plug-in unit.When A-1, A-4 switched on, after relief valve closed, pump came oil directly to enter the fast piece down of deadweight, and when A-1, A-2, A-3, A-4 energising, pump comes oil all to enter ejecting valve block 10.
4, the dosing pump group 7: be installed in the power mechanism, link to each other by coupling between motor and the pump, the inlet port of pump, oil outlet adopt and flexibly connect.When system feeds back to the corresponding controlling component of dosing pump by pressure transducer, the pump parameter changes.
The straight drive system of this warm cold extrusion hydraulic press ratio is realized sequence of movement:
1. slide block is descending fast
Connect electrical control instruction, this moment, dosing pump came oil to enter the master cylinder epicoele, and master cylinder cavity of resorption fluid flows back to fuel tank simultaneously, liquid-filling valve under the self-priming state to the oil cylinder repairing.At this moment, top slide block is in quick downstream state.
2. slide block is descending at a slow speed
When top slide block comes downwards to the retarding travel switching position (this position can be adjusted arbitrarily), fuel outlet valve, liquid-filling valve are closed, cavity of resorption oil can only be by supporting valve oil sump tank (setting pressure of supporting valve is not slipped down to well when static with slide block, and is unsuitable too high), the descending at a slow speed action of slide block do this moment.
3. the slide block compacting is descending
When the mould contact workpiece, make master cylinder pressure be elevated to a setting value (this force value is low more good more, as long as pressure transmitter energy sender), the time relay is started working (delay time is adjustable), at this moment the top slide block persistent pressure.
4. top slide block pressure release
When delaying time when time is up, liquid-filling valve is opened under the effect of control oil--and-hydraulic press automatical control system sends instruction, earlier the pressure oil of master cylinder epicoele is passed through the liquid-filling valve pressure release of oil cylinder epicoele.
5. top slide block snap back
Arrive constantly when the slide block pressure release, automatical control system sends instruction, and this moment, the fluid of pump entered master cylinder backhaul chamber by piece under pump discharge valve piece and the deadweight soon.
6. slide block backhaul deceleration, bottom slide block (hydraulic die cushion) eject
When top slide block backhaul during to the retarding travel position, pump comes an oily part to enter the master cylinder epicoele, and a part enters liftout tank by angled slide block, and slide block backhaul deceleration this moment, bottom slide block (hydraulic die cushion) eject.
7. the top slide block backhaul stops, bottom slide block continues to eject
When backhaul during to upper limit, the top slide block backhaul stops, and bottom slide block continues to eject, and the tensioning member demoulding returns to original position then.
Claims (5)
1, the straight drive system of a kind of temperature cold extrusion hydraulic press ratio, constitute by control gear, solenoid valve, oil circuit, it is characterized in that: the fast piece (4) down of deadweight is connected with pump discharge valve piece (8) with master cylinder (3), ejecting valve block (10) is connected with pump discharge valve piece (8) with liftout tank (11), and pump discharge valve piece (8) is connected with dosing pump (7); The fast piece (4) down of deadweight is made up of 6 plug-in units and 3 solenoid valves, 6 plug-in units are connected with 3 solenoid valves respectively, pump discharge valve piece (8) oil circuit is connected with master cylinder (3) epicoele through plug-in unit (b5), pump discharge valve piece (8) oil circuit links to each other with master cylinder (3) cavity of resorption through plug-in unit (b4, b3), and pump discharge valve piece (8) oil circuit is connected with fuel tank through plug-in unit (b4, b1, b2); Pump discharge valve piece (8) is made up of 6 plug-in units and 4 solenoid valves, 6 plug-in units are connected with 4 solenoid valves, dosing pump (7) oil circuit communicates with fuel tank through the safety valve that plug-in unit (a1, a6) constitutes, the directional control valve that constitutes through plug-in unit (a2, a3) and plug-in unit (a4, a5) respectively with ejecting valve block (10) and under conducting oneself with dignity soon piece (4) be connected; Ejecting valve block (10) is made up of 4 plug-in units and 2 solenoid valves, 4 plug-in units are connected with 2 solenoid valves, pump discharge valve piece (8) oil circuit is connected with liftout tank (11) through plug-in unit (c2), pump discharge valve piece (8) oil circuit is connected with fuel tank through plug-in unit (c3), and the oil circuit that links to each other with liftout tank (11) ejects Proportional valve through plug-in unit (c1) and is connected with fuel tank; Solenoid valve is connected with control gear.
2, the straight drive system of temperature cold extrusion hydraulic press ratio according to claim 1, it is characterized in that: master cylinder (3) epicoele oil circuit is connected with liquid-filling valve (2), pressure frequency variator (5-1), and liquid-filling valve (7) links to each other with control gear with pressure frequency variator (5-1).
3, the straight drive system of temperature cold extrusion hydraulic press ratio according to claim 1, it is characterized in that: top slide block is equipped with upper limit journey parts (1), and liftout tank (11) is equipped with lower limit journey parts (12), and limit journey parts (1,12) link to each other with control gear.
4, the straight drive system of temperature cold extrusion hydraulic press ratio according to claim 1 is characterized in that: the oil circuit that the fast piece (4) down of deadweight links to each other with master cylinder (3) epicoele is connected with proportional pressure control valve (6), and proportional pressure control valve (6) links to each other with control gear.
5, the straight drive system of temperature cold extrusion hydraulic press ratio according to claim 1 is characterized in that: on ejecting valve block (10) and the oil circuit that liftout tank (11) links to each other pressure frequency variator (5-2) is housed, pressure frequency variator (5-2) links to each other with control gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100202211A CN1330882C (en) | 2004-07-30 | 2004-07-30 | Proportional direct driving system in hydraulic machine for warm cold extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100202211A CN1330882C (en) | 2004-07-30 | 2004-07-30 | Proportional direct driving system in hydraulic machine for warm cold extrusion |
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| Publication Number | Publication Date |
|---|---|
| CN1727699A true CN1727699A (en) | 2006-02-01 |
| CN1330882C CN1330882C (en) | 2007-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100202211A Expired - Fee Related CN1330882C (en) | 2004-07-30 | 2004-07-30 | Proportional direct driving system in hydraulic machine for warm cold extrusion |
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| CN (1) | CN1330882C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100457320C (en) * | 2007-02-13 | 2009-02-04 | 西南铝业（集团）有限责任公司 | Controlling system of moulded forging hydraulic press with proportional type oil controlling water |
| CN101973138A (en) * | 2010-09-17 | 2011-02-16 | 无锡锦和科技有限公司 | Mold closing control assembly provided with oil cylinder and used for pressing oil hydraulic press |
| CN102303422A (en) * | 2011-09-26 | 2012-01-04 | 南通锻压设备股份有限公司 | Safety device for burst of hydraulic oil circuit of hydraulic press sliding block |
| CN102966616A (en) * | 2012-11-19 | 2013-03-13 | 无锡市京锡冶金液压机电有限公司 | Method of sequential acting of execution assemblies of hydraulic system transmission mechanism |
| CN103552276A (en) * | 2013-11-04 | 2014-02-05 | 江苏国力锻压机床有限公司 | Slide block control system of hydraulic machine |
| CN108953254A (en) * | 2018-09-28 | 2018-12-07 | 南通市腾达锻压机床厂 | Hydraulic system with nitrogen cylinder buffering in Sheet Metal Forming Technology |
| CN110185663A (en) * | 2019-05-30 | 2019-08-30 | 西安交通大学 | The adding of a kind of local loading carries the hydraulic closed-loop control system of step formula press machine |
| CN110242625A (en) * | 2019-05-17 | 2019-09-17 | 天津市天锻压力机有限公司 | A kind of hydraulic system inhibiting the rebound of nitrogen cylinder mold |
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| CN100457320C (en) * | 2007-02-13 | 2009-02-04 | 西南铝业（集团）有限责任公司 | Controlling system of moulded forging hydraulic press with proportional type oil controlling water |
| CN101973138A (en) * | 2010-09-17 | 2011-02-16 | 无锡锦和科技有限公司 | Mold closing control assembly provided with oil cylinder and used for pressing oil hydraulic press |
| CN101973138B (en) * | 2010-09-17 | 2015-07-01 | 无锡锦和科技有限公司 | Mold closing control assembly provided with oil cylinder and used for pressing oil hydraulic press |
| CN102303422A (en) * | 2011-09-26 | 2012-01-04 | 南通锻压设备股份有限公司 | Safety device for burst of hydraulic oil circuit of hydraulic press sliding block |
| CN102966616A (en) * | 2012-11-19 | 2013-03-13 | 无锡市京锡冶金液压机电有限公司 | Method of sequential acting of execution assemblies of hydraulic system transmission mechanism |
| CN103552276A (en) * | 2013-11-04 | 2014-02-05 | 江苏国力锻压机床有限公司 | Slide block control system of hydraulic machine |
| CN108953254A (en) * | 2018-09-28 | 2018-12-07 | 南通市腾达锻压机床厂 | Hydraulic system with nitrogen cylinder buffering in Sheet Metal Forming Technology |
| CN110242625A (en) * | 2019-05-17 | 2019-09-17 | 天津市天锻压力机有限公司 | A kind of hydraulic system inhibiting the rebound of nitrogen cylinder mold |
| CN110185663A (en) * | 2019-05-30 | 2019-08-30 | 西安交通大学 | The adding of a kind of local loading carries the hydraulic closed-loop control system of step formula press machine |
| CN110185663B (en) * | 2019-05-30 | 2020-06-16 | 西安交通大学 | Local-loading multi-loading step type press hydraulic closed-loop control system |
| CN112872158A (en) * | 2020-12-24 | 2021-06-01 | 天津市天锻压力机有限公司 | Hydraulic control system for center workbench of skin stretching hydraulic press |
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|---|---|
| CN1330882C (en) | 2007-08-08 |
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