CN201220490Y - Full-closed loop servo control system of oil press - Google Patents
Full-closed loop servo control system of oil press Download PDFInfo
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- CN201220490Y CN201220490Y CNU2008200352392U CN200820035239U CN201220490Y CN 201220490 Y CN201220490 Y CN 201220490Y CN U2008200352392 U CNU2008200352392 U CN U2008200352392U CN 200820035239 U CN200820035239 U CN 200820035239U CN 201220490 Y CN201220490 Y CN 201220490Y
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Abstract
A fully closed servocontrol system for an oil hydraulic press comprises an oil pump, an oil tank, a pressure control module, a master cylinder control module and an assistant cylinder control module; and the oil pump is connected with the pressure control module, the master cylinder control module and the assistant cylinder control module. The system can simultaneously achieve the functions of pressing, stretching, mold stripping, blanking and the like, has high processing flexibility, and conducts fully closed control on the speed, the position and the power of a formed punch and a hydraulic die cushion cylinder; through a position sensor and each pressure measuring hole, the acquired position control accuracy can reach plus or minus 0.02mm, and the press power and the stretch back pressure can be monitored; and compared with the traditional servo oil hydraulic press, pressure monitoring guarantees safe operation of the oil hydraulic press.
Description
Technical field
The utility model relates to the control of hydraulic press, is specially a kind of hydraulic press full cut-off ring servo-control system.
Background technology
External hydraulic press control level is higher, intellectuality, high accuracy, high-speed, but cost an arm and a leg.From the development level and the trend of external analysis hydraulic press be: the speed of service has improved 50% and has reached 500MM/s; Positional precision reaches the percentage level of millimeter, generally in ± 0.07mm; Improved the quality of formed product by the control of position and pressure.At hydraulic press industry Germany Muller Weingarten and Schuler company is the representative of the high-quality press in the world, especially well-known to produce the large-tonnage hydraulic press; And U.S. Beckwood company is famous with the servo-hydraulic driving pressure machine of uniqueness, and the hydraulic press digital control system of the said firm has product data storage (DLC) and part quality assurance function (PQA), and its position control accuracy reaches ± 0.02mm.
Domestic present hydraulic press development is also very rapid, Guangdong machine tool plant has developed a kind of high speed and precision hydraulic press, that its hydraulic system has adopted is servo, proportional control valve, pressure sensor, electrical system has adopted programmable controller, programming terminal, stroke position application grating chi detects, form closed-loop system, realize operating pressure control, control accuracy is significantly improved than the traditional oils press.Idle running speed is about 2.5 times of conventional hydraulic machine, and an impulse stroke can be carried out repeatedly punching press, stamping position precision≤0.05mm.CPU can store 200 different working procedures, to realize unit or multimachine automated production, is a kind of comparatively advanced electromechanical integrated product.
Keeping reforming and develop along with technology, the electro-hydraulic servo technology will progressively replace conventional hydraulic control, this technology is to improving precision, speed and security and intelligentized realization all have huge help, how in conjunction with the electro-hydraulic servo technology, make the function of hydraulic press and performance improves and improvement value must be studied.
Summary of the invention
Problem to be solved in the utility model is: in conjunction with the electro-hydraulic servo technology, design a kind of high control accuracy, and multi-functional, high performance hydraulic press control system.
The technical solution of the utility model is: hydraulic press full cut-off ring servo-control system, comprise oil pump, fuel tank, the pressure control module, master cylinder control module and auxiliary cylinder control module, oil pump connects the pressure control module, connect master cylinder control module and auxiliary cylinder control module more respectively, the pressure control module comprises two logical inserted valves, proportional pressure valve, safety valve and two position four-way solenoid valves, oil pump connects fuel tank through two logical inserted valves, proportional pressure valve and safety valve are connected in parallel between two logical inserted valves and the fuel tank, and two position four-way solenoid valves connect two logical inserted valves; The main fuel tank control module comprises master cylinder, fuel tank, prefill valve, proportional servo valve, two logical inserted valve, safety valve and counterbalance valves, the master cylinder epicoele connects fuel tank by prefill valve, prefill valve links to each other with two position four-way solenoid valves of pressure control module, the master cylinder epicoele also connects proportional servo valve, the output of oil pump connects the input of proportional servo valve, two logical inserted valves and counterbalance valve are connected in parallel between master cylinder cavity of resorption and the proportional servo valve, also be provided with reversal valve between two logical inserted valves and the proportional servo valve, the safety valve in parallel on the oil circuit that is connected of two logical inserted valves and reversal valve; The auxiliary cylinder control module comprises auxiliary cylinder, fuel tank, prefill valve, proportional servo valve, two logical inserted valves, safety valve and counterbalance valve, the auxiliary cylinder epicoele connects fuel tank by prefill valve, the auxiliary cylinder epicoele also connects proportional servo valve, the output of oil pump connects the input of proportional servo valve, two logical inserted valves and counterbalance valve are connected in parallel between auxiliary cylinder cavity of resorption and the proportional servo valve, also be provided with cover plate between two logical inserted valves and the proportional servo valve, the safety valve in parallel on the oil circuit that is connected of two logical inserted valves and cover plate, two logical inserted valves also connect a pressure-control valve group, described pressure-control valve group is made up of one or two a logical inserted valve and a proportional pressure valve, two logical inserted valves of auxiliary cylinder control module connect fuel tank by two logical inserted valves of pressure-control valve group, and the proportional pressure valve of pressure-control valve group is connected in parallel on two logical inserted valves of pressure-control valve group and being connected on the oil circuit of fuel tank.
The utility model also is provided with oil filter at the oil pump oil-out and filters fluid, differential pressure transmitter device prevents the pump start hypertonia, check valve prevents system's fluid flow-reversing impingement oil pump, and described oil filter, differential pressure transmitter device and check valve are connected in the oil-out place of oil pump in parallel; Be provided with the safe operation of pressure monitor safeguards system, master cylinder control module and auxiliary cylinder control module are provided with the back pressure pressure tap respectively at the counterbalance valve place, on the oil circuit between oil pump and the proportional servo valve, be respectively equipped with the system pressure pressure tap, be respectively equipped with oil cylinder upper cavity pressure pressure tap at master cylinder epicoele and auxiliary cylinder epicoele; The auxiliary cylinder of auxiliary cylinder control module is provided with position sensor, in order to the control position precision.
Of the present utility model two logical inserted valves are 16 latus rectums, two logical inserted valves; Proportional servo valve and proportional pressure valve adopt German Rexroth proportional servo valve and proportional pressure valve, have high stability, plurality of advantages such as high frequency response.
The utility model hydraulic press can be realized functions such as compacting, stretching, the demoulding, stamping-out simultaneously, has quite high processing flexibility; Drift and hydraulic die cushion oil cylinder speed, position, strength full cut-off ring are controlled, by position sensor and each pressure pressure tap, the position control accuracy that obtains can reach ± 0.02mm, can be to press power, the monitoring of stretching back pressure, compare with the servo hydraulic press of tradition, pressure monitor provides guarantee for its safe operation.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model stretch mode action timing diagram.
Fig. 3 is the utility model stamping-out pattern action timing diagram.
The specific embodiment
As Fig. 1, the utility model comprises oil pump 1, fuel tank 1.0, pressure control module 2, master cylinder control module 3 and auxiliary cylinder control module 4, oil filter 1.1, differential pressure transmitter device 1.2 and check valve 1.3 are connected in oil pump oil-out place in parallel, oil pump 1 connects pressure control module 2, connect master cylinder control module 3 and auxiliary cylinder control module 4 more respectively, pressure control module 2 comprises two logical inserted valves 2.0, proportional pressure valve 2.3, safety valve 2.4 and two position four-way solenoid valves 2.2, oil pump 2 connects fuel tank 1.0 through two logical inserted valves 2.0, proportional pressure valve 2.3 and safety valve 2.4 are connected in parallel between two logical inserted valves 2.0 and the fuel tank 1.0, two position four-way solenoid valves 2.2 connect two logical inserted valves 2.0, two logical inserted valves 2.0 are as pressure-control valve, proportional pressure valve 2.3 is in order to regulate whole system pressure, safety valve 2.4 restriction system maximum pressures, two position four-way solenoid valves 2.2 are used for controlling the unlatching and the closure of the prefill valve 3.6 of master cylinder control module, also be provided with check valve 2.1 between two position four-way solenoid valves 2.2 and the two logical inserted valves 2.0, prevent fuel tank 1.0 fluid flow-reversing impingement oil pumps 1; Main fuel tank control module 3 comprises master cylinder, fuel tank 3.0, prefill valve 3.6, proportional servo valve 3.2, two logical inserted valves 3.4, safety valve 3.5 and counterbalance valve 3.3, master cylinder epicoele 3.11 connects fuel tank 3.0 by prefill valve 3.6, prefill valve 3.6 links to each other with two position four-way solenoid valves 2.2 of pressure control module 2, master cylinder epicoele 3.11 also connects proportional servo valve 3.2, the output of oil pump 1 connects the input of proportional servo valve 3.2, two logical inserted valves 3.4 and counterbalance valve 3.3 are connected in parallel between master cylinder cavity of resorption 3.12 and the proportional servo valve 3.2, also be provided with reversal valve 3.7 between two logical inserted valves 3.4 and the proportional servo valve 3.2, the safety valve 3.5 in parallel on the oil circuit that is connected of two logical inserted valves 3.4 and reversal valve 3.7, wherein master cylinder epicoele 3.11 (rodless cavity) connects the 3A mouth of master cylinder control module, master cylinder cavity of resorption 3.12 (rod chamber) connects the 3B mouth, descending and the return of proportional servo valve 3.2 control oil cylinders, be provided with ball valve 3.8 controls two logical inserted valves 3.4, safety valve 3.5 and reversal valve 3.7, and be that two logical inserted valves 3.4 and counterbalance valve 3.3 are being suppressed, stretch, provide pressure in the stamping-out process, the maximum pressure of safety valve 3.5 restriction master cylinder cavity of resorptions 3.12; Auxiliary cylinder control module 4 comprises auxiliary cylinder, fuel tank 4.0, prefill valve 4.6, proportional servo valve 4.2, two logical inserted valves 4.4, safety valve 4.5 and counterbalance valve 4.3, auxiliary cylinder epicoele 4.11 connects fuel tank 4.0 by prefill valve 4.6, auxiliary cylinder epicoele 4.11 also connects proportional servo valve 4.2, the output of oil pump 1 connects the input of proportional servo valve 4.2, two logical inserted valves 4.4 and counterbalance valve 4.3 are connected in parallel between auxiliary cylinder cavity of resorption 4.12 and the proportional servo valve 4.2, also be provided with cover plate 4.7 between two logical inserted valves 4.4 and the proportional servo valve 4.2, the safety valve 4.5 in parallel on the oil circuit that is connected of two logical inserted valves 4.4 and cover plate 4.7, two logical inserted valves 4.4 also connect a pressure-control valve group, be used to control auxiliary cylinder pressure, described pressure-control valve group is made up of one or two a logical inserted valve 4.81 and a proportional pressure valve 4.82, two logical inserted valves 4.81 of the logical 4.4 excess pressure control valve groups of two logical inserted valves connect fuel tank 4.0, the proportional pressure valve 4.82 of pressure-control valve group is connected in parallel on being connected on the oil circuit of two logical inserted valves 4.81 and fuel tank 4.0, wherein auxiliary cylinder epicoele 4.11 (rod chamber) connects the 4A mouth of auxiliary cylinder control module, auxiliary cylinder cavity of resorption 4.12 (rodless cavity) connects the 4B mouth, be provided with ball valve 4.8 controls two logical inserted valves 4.4, safety valve 4.5, auxiliary cylinder also is provided with position sensor 4.9, in order to the control position precision.
Compare with the servo hydraulic press of tradition, the utlity model has pressure monitor and provide safety guarantee for it, wherein master cylinder control module and auxiliary cylinder control module are provided with back pressure pressure tap M3.3 and M4.3 respectively at the counterbalance valve place, are used for monitoring back pressure; On the oil circuit between oil pump and the proportional servo valve, be respectively equipped with pressure tap M3.1 and M4.1, be used for monitoring system pressure, be respectively equipped with pressure tap M3.2 and M4.2, be used for monitoring the oil cylinder upper cavity pressure at master cylinder epicoele and auxiliary cylinder epicoele.
Of the present utility model two logical inserted valves are 16 latus rectums, two logical inserted valves; Proportional servo valve and proportional pressure valve adopt German Rexroth proportional servo valve and proportional pressure valve, have high stability, plurality of advantages such as high frequency response.
The explanation of the utility model course of work:
Pressure control: start Oil pump electrical machinery, passing ratio pressure valve (2.3) control two logical inserted valves (2) come regulating system pressure, and pressure valve (2.4) is used for the control system maximum pressure.
One. stretch, suppress working cycles, the master cylinder action, action timing diagram such as Fig. 2:
1) wait for: all valves all must not be electric, and the fluid of pressure control module returns fuel tank by two logical inserted valves 2.0;
2) down fast: as to give proportional servo valve 3.2 negative voltages (100%), ball valve 3.8, oil cylinder piston is because the deadweight downslide, fluid sucks master cylinder epicoele 3.11 by prefill valve 3.6, simultaneously oil pump 1 is discharged fluid (P → A) is also entered master cylinder epicoele 3.11 through proportional servo valve 3.2, master cylinder cavity of resorption 3.12 fluid pass through proportional servo valve 3.2 again through two logical inserted valves 3.4, and (B → T) flows back to fuel tank 3.0, thereby descend the opening of the control voltage control ratio servo valve 3.2 that speed can be by adjusting proportional servo valve 3.2 to realize soon;
3) slow down: when drawing die arrival rate transfer point, the voltage of proportional servo valve 3.2 progressively drops to 0V by the negative voltage linearity.
4) compacting: the voltage of proportional pressure valve 2.3 by 0V gradually linearity increase to 24V, two position four-way solenoid valves 2.2 get the electric prefill valve 3.6 that makes and close, proportional servo valve 3.2, (P → A) enters master cylinder epicoele 3.11 to fluid through proportional servo valve 3.2, ball valve 3.8 dead electricity, master cylinder cavity of resorption 3.12 fluid were advanced counterbalance valve 3.3, proportional servo valve 3.2 flows into fuel tank 3.0;
5) pressurize: when drawing die arrives bottom dead centre, proportional servo valve 3.2 dead electricity, valve port is closed, and cuts off the fluid loop of master cylinder upper and lower cavity, makes drawing die rest on bottom dead centre;
6) rush down pressure: proportional servo valve 3.2 positive electricity (10%), proportional pressure valve 2.3 dead electricity of pressure control module rush down master cylinder epicoele 3.11 pressure fall, (A → T) flows into fuel tank to fluid through proportional servo valve 3.2;
7) quick return: proportional servo valve 3.2 gets electric (100%), the proportional pressure valve 2.3 of pressure control module gets electric (80%), two position four-way solenoid valves, 2.2 dead electricity are opened prefill valve 3.6, fluid enters master cylinder cavity of resorption 3.12 through proportional servo valve 3.2, master cylinder epicoele 3.11 rushes down oil simultaneously by prefill valve 3.6 and proportional servo valve 3.2, can control return speed by the voltage of regulating proportional pressure valve 3.2;
8) slow down: proportional servo valve 3.2 voltages linearity gradually reduce, but not exclusively valve port are closed, and guarantee that mould slowly is stopped at upper dead center position;
9) stop: the equal dead electricity of all valves of The whole control system, system pressure is 0, mould is stopped at upper dead center position;
10) slow down: when drawing die arrival rate transfer point proportional servo valve 3.2 by negative voltage progressively linearity drop to 0V.
Two. demoulding working cycles, auxilliary cylinder action:
1) ejects: in master cylinder wait process, the proportional servo valve 4.2 of auxiliary cylinder control module gets positive electricity, the proportional pressure valve 4.82 of pressure-control valve group, fluid is through the proportional servo valve 4.2 in the auxiliary cylinder control module, two logical inserted valves 4.4 enter auxiliary cylinder cavity of resorption 4.12, and the fluid of auxiliary cylinder epicoele 4.11 flows back to fuel tank through proportional servo valve 4.2;
2) slow down: in master cylinder wait process, the linear gradually dead electricity of the proportional servo valve 4.2 of auxiliary cylinder control module is driven gradually valve and is reduced, and slows down oil cylinder and ejects speed;
3) wait for holding position, pushes back: the holding position waits at master cylinder soon down and in the pressing process, pushing back at master cylinder and suppressing in master cylinder wait process, pressurize and rush down the pressure stage;
4) return: in quick return of master cylinder and decelerating phase, this moment, the proportional servo valve 4.2 of auxiliary cylinder control module got negative electricity, ball valve 4.8 gets electric, and pressure makes fluid enter the oil cylinder epicoele, and auxiliary cylinder cavity of resorption fluid flows back to fuel tank through two logical inserted valves 4.4 and proportional servo valve 4.2;
5) be stopped at original position, stop: respectively with master cylinder be stopped at original position with stop corresponding, the equal dead electricity of all valves of The whole control system, oil cylinder is stopped at bottom dead centre.
Three. the stamping-out working cycles, the master cylinder action, action timing diagram such as Fig. 3:
1) down fast: the proportional servo valve 3.2 of master cylinder control module gets negative electricity, because piston deadweight, fluid enters master cylinder epicoele 3.11 by prefill valve 3.6, and ball valve 3.8 gets electric, and the fluid of master cylinder cavity of resorption 3.12 flows back to fuel tank through two logical inserted valves 3.4 and proportional servo valve 3.2;
2) punching press: the proportional pressure valve 2.3 of pressure control module, regulate the voltage of proportional pressure valve 2.3 and can regulate the stamping press size, two position four-way solenoid valves 2.2 get the electric prefill valve 3.6 that makes and close, pressure makes oil enter master cylinder epicoele 3.11 through proportional servo valve 3.2, and the fluid of master cylinder cavity of resorption 3.12 flows back to fuel tank by two logical inserted valves 3.4 and proportional servo valve 3.2;
3) return: proportional servo valve 3.2, two position four-way solenoid valves, 2.2 dead electricity of pressure control module, prefill valve 3.6 is opened, ball valve 3.8 dead electricity, fluid enters master cylinder cavity of resorption 3.12 through proportional servo valve 3.2, two logical inserted valves 3.4, and master cylinder epicoele 3.11 fluid flow back to fuel tank by prefill valve 3.6;
4) feeding: the equal dead electricity of all valves, oil cylinder are stopped at the punching press point, wait for feeding.
The utility model also has product data memory function (DLC) and part quality analytic function (PQA): product data memory function DLC is with various materials, thickness, the pressure that shape that variform sheet material need be processed into and moulding are required, parameters such as speed are carried out program storage, call different programs and do not need to carry out again the parameter setting at material characteristics and forming shape in real work; Part quality analytic function PQA: at first try processing, finished product is called sample, sample is surveyed and drawn, if this sample is qualified, then to processing the various parameter (pressure in this sample process, speed, displacements etc.) preserve, in the process of batch machining, the molding parameter of each finished product all can be in contrast then, then qualified in error range, on the contrary then be waste product.
Claims (9)
1, hydraulic press full cut-off ring servo-control system, it is characterized in that comprising oil pump, fuel tank, pressure control module, master cylinder control module and auxiliary cylinder control module, oil pump connects the pressure control module, connects master cylinder control module and auxiliary cylinder control module more respectively
The pressure control module comprises two logical inserted valves, proportional pressure valve, safety valve and two position four-way solenoid valves, oil pump connects fuel tank through two logical inserted valves, proportional pressure valve and safety valve are connected in parallel between two logical inserted valves and the fuel tank, and two position four-way solenoid valves connect two logical inserted valves;
The main fuel tank control module comprises master cylinder, fuel tank, prefill valve, proportional servo valve, two logical inserted valve, safety valve and counterbalance valves, the master cylinder epicoele connects fuel tank by prefill valve, prefill valve links to each other with two position four-way solenoid valves of pressure control module, the master cylinder epicoele also connects proportional servo valve, the output of oil pump connects the input of proportional servo valve, two logical inserted valves and counterbalance valve are connected in parallel between master cylinder cavity of resorption and the proportional servo valve, also be provided with reversal valve between two logical inserted valves and the proportional servo valve, the safety valve in parallel on the oil circuit that is connected of two logical inserted valves and reversal valve;
The auxiliary cylinder control module comprises auxiliary cylinder, fuel tank, prefill valve, proportional servo valve, two logical inserted valves, safety valve and counterbalance valve, the auxiliary cylinder epicoele connects fuel tank by prefill valve, the auxiliary cylinder epicoele also connects proportional servo valve, the output of oil pump connects the input of proportional servo valve, two logical inserted valves and counterbalance valve are connected in parallel between auxiliary cylinder cavity of resorption and the proportional servo valve, also be provided with cover plate between two logical inserted valves and the proportional servo valve, the safety valve in parallel on the oil circuit that is connected of two logical inserted valves and cover plate, two logical inserted valves also connect a pressure-control valve group, described pressure-control valve group is made up of one or two a logical inserted valve and a proportional pressure valve, two logical inserted valves of auxiliary cylinder control module connect fuel tank by two logical inserted valves of pressure-control valve group, and the proportional pressure valve of pressure-control valve group is connected in parallel on two logical inserted valves of pressure-control valve group and being connected on the oil circuit of fuel tank.
2, hydraulic press full cut-off ring servo-control system according to claim 1 is characterized in that being provided with oil filter, differential pressure transmitter device and check valve, and described oil filter, differential pressure transmitter device and check valve are connected in the oil-out place of oil pump in parallel.
3, hydraulic press full cut-off ring servo-control system according to claim 1 and 2, it is characterized in that master cylinder control module and auxiliary cylinder control module are provided with the back pressure pressure tap respectively at the counterbalance valve place, on the oil circuit between oil pump and the proportional servo valve, be respectively equipped with the system pressure pressure tap, be respectively equipped with oil cylinder upper cavity pressure pressure tap at master cylinder epicoele and auxiliary cylinder epicoele.
4, hydraulic press full cut-off ring servo-control system according to claim 1 and 2 is characterized in that the auxiliary cylinder of auxiliary cylinder control module is provided with displacement transducer.
5, hydraulic press full cut-off ring servo-control system according to claim 3 is characterized in that the auxiliary cylinder of auxiliary cylinder control module is provided with displacement transducer.
6, hydraulic press full cut-off ring servo-control system according to claim 1 and 2 is characterized in that two logical inserted valves are 16 latus rectums, two logical inserted valves, and proportional servo valve and proportional pressure valve all adopt German Rexroth proportional servo valve and proportional pressure valve.
7, hydraulic press full cut-off ring servo-control system according to claim 3 is characterized in that two logical inserted valves are 16 latus rectums, two logical inserted valves, and proportional servo valve and proportional pressure valve all adopt German Rexroth proportional servo valve and proportional pressure valve.
8, hydraulic press full cut-off ring servo-control system according to claim 4 is characterized in that two logical inserted valves are 16 latus rectums, two logical inserted valves, and proportional servo valve and proportional pressure valve all adopt German Rexroth proportional servo valve and proportional pressure valve.
9, hydraulic press full cut-off ring servo-control system according to claim 5 is characterized in that two logical inserted valves are 16 latus rectums, two logical inserted valves, and proportional servo valve and proportional pressure valve all adopt German Rexroth proportional servo valve and proportional pressure valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200352392U CN201220490Y (en) | 2008-05-06 | 2008-05-06 | Full-closed loop servo control system of oil press |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200352392U CN201220490Y (en) | 2008-05-06 | 2008-05-06 | Full-closed loop servo control system of oil press |
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| CN201220490Y true CN201220490Y (en) | 2009-04-15 |
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| 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 |
| CN102602019A (en) * | 2012-03-22 | 2012-07-25 | 上海大学 | Low-power 200mm/s grade high-speed large-tonnage four-post single-acting hot-stamping oil press |
| CN102699670A (en) * | 2012-05-31 | 2012-10-03 | 韶关东南轴承有限公司 | Riveting device based on speed and pressure combination control |
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| 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 |
| CN102602019A (en) * | 2012-03-22 | 2012-07-25 | 上海大学 | Low-power 200mm/s grade high-speed large-tonnage four-post single-acting hot-stamping oil press |
| CN102699670A (en) * | 2012-05-31 | 2012-10-03 | 韶关东南轴承有限公司 | Riveting device based on speed and pressure combination control |
| CN102699670B (en) * | 2012-05-31 | 2015-03-04 | 韶关东南轴承有限公司 | Riveting device based on speed and pressure combination control |
| CN102840972A (en) * | 2012-09-19 | 2012-12-26 | 大连华锐重工集团股份有限公司 | Hydraulic loading device for mechanical part test table |
| CN102840972B (en) * | 2012-09-19 | 2015-07-08 | 大连华锐重工集团股份有限公司 | Hydraulic loading device for mechanical part test table |
| CN102966615A (en) * | 2012-11-26 | 2013-03-13 | 山东法因数控机械股份有限公司 | Servo hydraulic control system with automatically adjustable punching stroke and speed of punch press |
| CN103342002A (en) * | 2013-07-01 | 2013-10-09 | 武昌船舶重工有限责任公司 | Oil press failure monitoring system and processing method thereof |
| CN103342002B (en) * | 2013-07-01 | 2015-04-22 | 武昌船舶重工集团有限公司 | Oil press failure monitoring system and processing method thereof |
| CN104760327A (en) * | 2014-01-08 | 2015-07-08 | 佛山市恒力泰机械有限公司 | Pressure switching and pressurization control method and system of hydraulic powder pressing machine |
| CN103775411A (en) * | 2014-01-08 | 2014-05-07 | 浙江大学 | Hydraulically-controlled pilot level servo valve based on speed difference dynamic pressure feedback |
| CN103775411B (en) * | 2014-01-08 | 2015-09-23 | 浙江大学 | A kind of servovalve based on speed difference dynamic pressure feedback fluid-control pilot stage |
| CN105107875A (en) * | 2015-09-17 | 2015-12-02 | 太原科技大学 | Dual-pressure closed-loop control method for full-hydraulic straightener |
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Effective date of registration: 20160108 Address after: 211100 Jiangning Economic Development Zone, Jiangsu Province, general Avenue, No. 155, No. Patentee after: Nanjing Estun Automation Co., Ltd. Address before: Shengtai Industrial Park No. 88 SIEMENS Road, Jiangning Development Zone in Nanjing City, Jiangsu province 211100 Patentee before: Aierfa Electrohydraulic Technology Co., Ltd., Nanjing City |
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