CN1007371B - Synchronous control device of multi-hydraulic-cylinder drive - Google Patents
Synchronous control device of multi-hydraulic-cylinder driveInfo
- Publication number
- CN1007371B CN1007371B CN 86108883 CN86108883A CN1007371B CN 1007371 B CN1007371 B CN 1007371B CN 86108883 CN86108883 CN 86108883 CN 86108883 A CN86108883 A CN 86108883A CN 1007371 B CN1007371 B CN 1007371B
- Authority
- CN
- China
- Prior art keywords
- cylinder
- hydraulic
- conduit
- pressure
- operating cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A synchronisation device for a hydraulic multiple-cylinder drive, in particular for a press brake, having a displacement pickup (8) allotted to each working cylinder (4) in each case and connected to a common electronic control unit (10) in each case, and having a control valve (20) to which pressure medium is admitted and which is connected to the control unit (10) via control lines (22), one control valve for each working cylinder, all the control valves (20) being connected to a common drive station (17) for supplying the working cylinders (4) with pressure medium, characterised in that both sides of each working cylinder (4) are connected via shuttle valves (33, 34, 37) to one common three-way pressure balance (39) for all the working cylinders (4).
Description
The present invention relates to a kind of multi-hydraulic-cylinder transmission, especially the synchronizing controls of mould bender, it adorns a displacement transducer that links with public electric controller on each operating cylinder, all be equipped with the proportional reversing valve of the pressure medium supply that links via control wiring and controller and handle for each operating cylinder.
Design multi-hydraulic-cylinder transmission or other similar equipment have a basic demand during as the mould bender, that will make as far as possible accurately synchronous working of each operating cylinder exactly.In hitherto known this kind equipment, attempt to satisfy this requirement by various diverse auxiliary devices.
Simple proposal is with the way of machinery, for example adopt guiding device to force it synchronous, so the structure of machine is very complicated, and needs the oil hydraulic cylinder of the costliness of band unitary fixed block.However, its parallelism precision and not really high is in case it can not compensate when parallelism error occurring.
In some other existing equipments, adopt gear-type hydraulic motor, flow distributor etc., to obtain enforceable Hydraulic Synchronizing.Equally, their parallelism precision is not high especially yet, and can not compensate the unexpected deviation that occurs.
By the synchronizing controls of two kinds of multi-hydraulic-cylinder transmission device as can be known among patent DE-OS3336713 and the DE-OS3338218, they come the different movement process of balance operating cylinder with the mode of mechanical-hydraulic, therefore have one to be the mechanical compensation hydraulic valve of handling by the displacement difference that occurs basically.This device except the cost of equipment of handling synchronous valve than higher, the precision of handling mainly is subjected to the serious restriction of the sum of errors bearing play that has in the necessary mechanical transmission etc. synchronously.
For avoiding the shortcoming of above-mentioned mechanical-hydraulic formula synchronizing controls, the controlling device that this paper begins described type has appearred recently, and their adopt electro-hydraulic method to guarantee that operating cylinder reaches high precision synchronous.By being contained in the analysis of the displacement transducer on each operating cylinder, and and electric controller, proportional reversing valve determine the synchronization accuracy that reached together.In the working procedure of machine, this device can guarantee to reach 0.01 millimeter parallelism and synchronization accuracy.
The shortcoming of existing this electro-hydraulic synchronizing controls mainly is, has hydraulic system separately completely separate from each other for each operating cylinder, that is to say, basically whole hydraulic units, as pump, filter and presumable pressure sky equality, must correspondingly be equipped with by the operating cylinder quantity in the machine, so the cost of equipment height.So, partial offset and limited the advantage of the high synchronization accuracy that is had at least.
Task of the present invention is to improve this paper to begin described this homochronousness controlling device, makes it both to maintain accessible parallelism and synchronous highi degree of accuracy, can reduce installation cost expenditure required in the device again.The measure of being taked is, each proportional reversing valve all links with the driving station of a public supply operating cylinder pressure medium.The result who does has like this reached the purpose that reduces the installation cost in the synchronizing controls immediately, because for a heavy wool cylinder apparatus, at this moment only needs a unique oil hydraulic pump and filter etc.True some show surprisingly, supply some operating cylinders by the present invention with a public driving station, they each other the influence of hydraulic pressure can ignore, that is to say, in fact can be compensated completely by the electro-hydraulic synchronizing controls.
According to the further optimal design of the present invention, the both sides of each operating cylinder link through selector valve and a public threeway pressure balance that is used for all working oil cylinder, do like this to help reaching above cited purpose of the present invention, further reduce installation cost.Threeway pressure balance is known in the sort of existing electro-hydraulic formula synchronizing controls that this paper begins to be mentioned, use threeway pressure balance can reduce the loss of active power of multi-hydraulic-cylinder transmission device, because the unnecessary amount of pressure medium can be got back to fuel tank through threeway pressure balance under current system pressure, and need not, otherwise can cause bigger heat loss through the pressure maximum stop valve.In addition, by means of this threeway pressure balance, can guarantee that each passage of passing ratio selector valve has permanent pressure drop.
Below the mould bender embodiment that represents by means of schematic representation with double hydraulic cylinder transmission and synchronizing controls, further specify the present invention.
The mould bender of doing in detail expression on the figure 2,3 places, 1 two outer ends of putting the beams in place respectively are provided with a hydraulic cylinder/piston device 4.Piston 5 with put the beams in place 1 itself, 6 of oil cylinders couple together (expression on the figure) respectively with frame.Underbeam 7 is connected (not shown) with rigidity of frame.Therefore, by oil cylinder/piston apparatus 4, can between upper beam 1 and underbeam 7, form relative movement.With corresponding, removable common die, utilize this relative movement, just can carry out bending to the workpiece between upper beam 1 and underbeam 7.
2,3 places, two outer ends of upper beam 1 are provided with displacement transducer 8, it can be according to for example reflection grating, principle of induction or other form, as analog, increment type with digitally carry out work, with the corresponding signal of actual distance between upper beam 1 that one and this place are provided and the underbeam 7, and signal passed to public electric controller 10 by signaling line 9.
By conduit 12 to 16 and the driving station 17 that the annular chamber 11 of oil cylinder/piston apparatus 4 links to each other, mainly comprise a motor 18, the oil hydraulic pump 19 that links to each other with motor, and also have the not oil of expression filter herein in case of necessity.This driving station 17 be by two oil cylinder/piston apparatus 4 shared.In the conduit 14,15 and 13,16 that two oil cylinder/piston apparatus 4 are separated from each other proportional reversing valve 20 is housed all, but their passing ratio magnet 21 and control corresponding lead 22 are directly promoted by electric controller 10, and according to their switching position decision to annular chamber 11, or on the contrary through conduit 23,23 ' to the size of oil pocket 24 fuel deliveries of oil cylinder; Meanwhile, correspondingly make oil flow back to by conduit 25,26,27 or stop to flow back to fuel tank 28 from the oil pocket 24 of oil cylinder or annular chamber 11.
Each is by the both sides of the operating cylinder 4 that oil cylinder/piston apparatus constituted, by with the catheter pressure 29,30 and 31,32 of conduit 15,23 and 16,23 ' link to each other, communicate with selector valve 33,34, selector valve is connected with a selector valve 37 that is in their upper level positions by conduit 35,36 again.According to design, all three selector valves all are subjected to the pressure maximum of system all the time.The outlet of selector valve 37 is through conduit 38 and threeway pressure balance 39 UNICOMs, and in represented embodiment, pressure balance 39 is designed to slide-valve component.The valve chamber of the pressure balance 39 of higher level's selector valve 37 conduits 38 imports links to each other with the delivery channel 12 of oil hydraulic pump 19 by conduit 40 dorsad; Under the guiding valve 41 residing positions of pressure balance 39 represented on the figure, the annular chamber 42 that is cut off passes through conduit 27 to fuel tank 28 emptyings.
Exporting the conduit 12 that links to each other with oil hydraulic pump 19 and leading toward between the conduit 27 of fuel tank 28, insert a pressure regulator valve 43 by conduit 44,45, it for example is electric proportion expression equally, and by electric controller 10 by on the figure not the mode of expression limit and guarantee necessary crooked pressure, the size of pressure can be passed through the electronic component compiled program in the controller 10, or is calculated according to various procedure parameters by controller.
Before the work of the mould bender synchronizing controls that schematic representation is represented is further discussed below, should be understood that, the various standard equipment of required setting here, lift height and pumping equipment as what is called, because it is unimportant for the problem that will narrate, simultaneously also in order to make figure succinctly understandable, so all not expressions in the drawings.
When supposition is handled proportional reversing valve 20 and is opened, put the beams in place 1 with respect to the axial direction setting in motion of underbeam 7 along operating cylinder 4, moving direction at this moment depend on conduit 15,23 and 16,23 ' in that of being opened.1 two outer ends, 2,3 the present positions of putting the beams in place with respect to underbeam 7, by displacement transducer 8 not cracked ends signaling line 9 send controller 10 to, carry out the comparison of rating value and actual value there in the mode of electricity.Owing to the hydraulic pressure installation design parameter is inevitably distinguished the deviation with respect to the zero shift difference that produces, or with respect to underbeam certain inclination is arranged and previously selected displacement difference has produced deviation with respect to the desired upper beam of horizontal bender of being engaged in certain work, all cause changing to the control signal that ratio magnet provides by lead 22, thereby correspondingly influence the free flow cross section of relevant proportional reversing valve 20, this will make that leading operating cylinder braking, or backward oil cylinder is quickened as required.In this way, these two operating cylinders 4 can carry out continuous synchronization regulation very accurately.For displacement transducer 8, controller 10 and the proportional reversing valve that can buy on the market now, can guarantee without difficulty that synchronization accuracy is within 0.01 millimeter scope.
In order to reduce as far as possible when putting the beams in place 1 terminal point that calculates near program by general fashion or bending point with slowing down strongly, the power loss that in system, causes because the proportional reversing valve flow area is very little, selector valve 33,34 and 37 is designed to hydraulic medium unnecessary, that no longer need at this moment is discharged into annular chamber 42 and the conduit 27 that is opened in the pressure balance 39 by conduit 40, so pressure regulator valve 43 will just be opened under bending point and the pressure maximum of adjusting.At pressure regulator valve 43 places because of bigger warm boundary is arranged, so can cause power loss.
Because the quantity of this device of narrating and representing and operating cylinder is irrelevant, it has only a work station and a pressure balance, so although the synchronization regulation precision is very high, installation cost significantly reduces, this has just reduced assembling and Cost of repair and maintenance.
Whether the structure and its work that should also be noted that this device at last is symmetrical irrelevant with the proportional reversing valve piston that is adopted, so can use the very big operating cylinder of oil cylinder conversion ratio difference.In addition, in order to improve degree of regulation, the displacement transducer (not shown) of direct measurement scale selector valve piston position can be set, they pass through signaling line separately, link to each other with controller 10, and the specified/physical location that can carry out these valves is regulated the therefore degree of accuracy that can further improve synchronizing controls.
Claims (2)
1, a kind of synchronizing controls of multi-hydraulic-cylinder transmission, include a plurality of operating cylinders, a displacement transducer that links with public electric controller is housed on each operating cylinder, each operating cylinder all is equipped with the proportional reversing valve of the pressure medium supply that links to each other with controller via control wiring and handle, it is characterized in that all proportional reversing valves (20) all are connected with the work station of public supply operating cylinder (a 4) pressure medium.
According to the synchronizing controls of the described multi-hydraulic-cylinder transmission of claim 1, it is characterized in that 2, two sides of each operating cylinder (4) are through catheter pressure (29,30; 31,32) link to each other with selector valve (33,34), said catheter pressure is received the conduit (15,23 of guiding operating cylinder (4) into; 16,23 '), selector valve (33,34) links to each other through the selector valve (37) that conduit (35,36) is installed on it again, and the outlet of selector valve (37) is connected via a conduit (38) the threeway pressure balance public with being all working oil cylinder (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT3773/85 | 1985-12-30 | ||
| AT377385A AT385466B (en) | 1985-12-30 | 1985-12-30 | SIMULTANEOUS CONTROL UNIT FOR A HYDRAULIC MULTI-CYLINDER DRIVE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86108883A CN86108883A (en) | 1987-08-12 |
| CN1007371B true CN1007371B (en) | 1990-03-28 |
Family
ID=3555231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86108883 Expired CN1007371B (en) | 1985-12-30 | 1986-12-29 | Synchronous control device of multi-hydraulic-cylinder drive |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0231735B1 (en) |
| JP (1) | JPS62230426A (en) |
| CN (1) | CN1007371B (en) |
| AT (1) | AT385466B (en) |
| DE (1) | DE3668433D1 (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2655907B1 (en) * | 1989-12-19 | 1993-07-30 | Plazenet Jean | HYDRAULIC BENDING PRESS WITH MOBILE LOWER APRON. |
| JPH087934Y2 (en) * | 1990-03-28 | 1996-03-06 | 株式会社小松製作所 | Press brake hydraulic circuit |
| CH683162A5 (en) * | 1990-04-25 | 1994-01-31 | Bobst Sa | Method of slaving the parallelism of the two beams of a cutting press sheet-like elements or band for the production of packaging. |
| FR2676041B1 (en) * | 1991-05-03 | 1997-10-03 | Freyssinet | METHOD OF MULTIPOINT CONTROLLED LIFTING OF RELATIVELY FLEXIBLE STRUCTURES, AND CORRESPONDING SYSTEMS. |
| IT1264249B1 (en) * | 1993-10-22 | 1996-09-23 | Ravaglioli Spa | "ELECTROHYDRAULIC LIFT" |
| RU2151060C1 (en) * | 1999-06-23 | 2000-06-20 | Орловский государственный технический университет | Synchronization system of displacement of hydraulic cylinders |
| SE517223C2 (en) * | 2000-09-20 | 2002-05-14 | Morphic Technologies Ab | Hydraulic device for synchronizing at least two cooperating hydraulic pistons |
| CN1325803C (en) * | 2004-11-03 | 2007-07-11 | 北京中水长固液分离技术有限公司 | Compressing apparatus and control method for multi-cylinder synchronously pressurizing |
| CN101975202B (en) * | 2010-10-15 | 2013-07-24 | 马鞍山钢铁股份有限公司 | Control method of hydraulic cylinder synchronous control system |
| DE102012015118B3 (en) * | 2012-04-17 | 2013-10-10 | Hoerbiger Automatisierungstechnik Holding Gmbh | machine press |
| CN102943789B (en) * | 2012-11-09 | 2015-12-09 | 昆明中铁大型养路机械集团有限公司 | The buffering hydraulic cylinder of a kind of adjustable pressure and flow, controlling method and hydraulic system |
| CN102996580A (en) * | 2012-11-27 | 2013-03-27 | 齐齐哈尔轨道交通装备有限责任公司 | Control system for side bearing oil cylinder |
| CN103089750B (en) * | 2012-12-10 | 2015-11-18 | 天水锻压机床(集团)有限公司 | Controller and the controlling method thereof of the control of many group oil cylinders is carried out with programmable controller |
| CN103640248A (en) * | 2013-11-16 | 2014-03-19 | 苏州蓝王机床工具科技有限公司 | Synchronous control system for two hydraulic cylinders of gantry hydraulic machine |
| CN103671334B (en) * | 2013-12-12 | 2016-01-27 | 中联重科股份有限公司 | Hydraulic control system for synchronous lifting of hydro-pneumatic suspension oil cylinders and engineering vehicle |
| CN103775418B (en) * | 2014-01-06 | 2014-10-29 | 华中科技大学 | A double-cylinder synchronous device for a hydraulic press |
| DE102014005352B4 (en) * | 2014-04-11 | 2016-03-10 | Hoerbiger Automatisierungstechnik Holding Gmbh | machine press |
| CN105465074A (en) * | 2014-09-02 | 2016-04-06 | 天津市天锻压力机有限公司 | Powder hydraulic machine process synchronous motion system based on Delta controller |
| CN105458251B (en) * | 2014-09-02 | 2018-02-06 | 天津市天锻压力机有限公司 | Powder hydraulic press Precise Position System based on Delta controllers |
| CN104340905A (en) * | 2014-11-12 | 2015-02-11 | 南京中船绿洲机器有限公司镇江船舶辅机厂 | Synchronous detection circuit and synchronous control method of retractable device with two hanging points |
| CN104747516B (en) * | 2015-01-30 | 2017-03-22 | 四川南骏汽车集团有限公司 | Synchronous lifting control system for hydraulic cylinders |
| CN104743470A (en) * | 2015-03-31 | 2015-07-01 | 苏州艾沃意特机械设备制造有限公司 | Visualized self-leveling double-column type lifter |
| CN105020192A (en) * | 2015-07-30 | 2015-11-04 | 中国重型机械研究院股份公司 | Novel steel ladle lifting synchronous control system |
| CN105818417A (en) * | 2016-05-24 | 2016-08-03 | 郭文坤 | Pressure self-balanced punching machine |
| CN106438520A (en) * | 2016-12-17 | 2017-02-22 | 中国重型机械研究院股份公司 | Cooling bed lifting hydraulic synchronous control device |
| CN112387335A (en) * | 2020-11-05 | 2021-02-23 | 混楚(上海)环保设备制造有限公司 | Intelligent static pressure crushing device for waste concrete |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2029287C3 (en) * | 1970-06-13 | 1978-07-13 | Vereinigte Flugtechnische Werke- Fokker Gmbh, 2800 Bremen | Arrangement for monitoring and adapting several electrohydraulic actuators acting on a common output |
| US4145958A (en) * | 1977-12-02 | 1979-03-27 | Borg-Warner Corporation | Fluid control system with automatically actuated motor port lock-out valves |
| DD204460A1 (en) * | 1982-03-24 | 1983-11-30 | Bauakademie Ddr | HYDRAULIC DEVICE FOR SYNCHRONOUS MOVEMENT OF LOADS |
| JPH0677879B2 (en) * | 1985-07-06 | 1994-10-05 | 株式会社アマダ | Electro-hydraulic servo device for processing machine |
-
1985
- 1985-12-30 AT AT377385A patent/AT385466B/en not_active IP Right Cessation
-
1986
- 1986-12-19 EP EP19860890350 patent/EP0231735B1/en not_active Expired - Lifetime
- 1986-12-19 DE DE8686890350T patent/DE3668433D1/en not_active Expired - Fee Related
- 1986-12-25 JP JP30808086A patent/JPS62230426A/en active Pending
- 1986-12-29 CN CN 86108883 patent/CN1007371B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86108883A (en) | 1987-08-12 |
| AT385466B (en) | 1988-04-11 |
| ATA377385A (en) | 1987-09-15 |
| EP0231735A1 (en) | 1987-08-12 |
| EP0231735B1 (en) | 1990-01-24 |
| JPS62230426A (en) | 1987-10-09 |
| DE3668433D1 (en) | 1990-03-01 |
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| C13 | Decision | ||
| GR02 | Examined patent application | ||
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |