EP1261808A1 - Linearantrieb mit integriertem pneumohydraulischen druckübersetzer - Google Patents
Linearantrieb mit integriertem pneumohydraulischen druckübersetzerInfo
- Publication number
- EP1261808A1 EP1261808A1 EP01915078A EP01915078A EP1261808A1 EP 1261808 A1 EP1261808 A1 EP 1261808A1 EP 01915078 A EP01915078 A EP 01915078A EP 01915078 A EP01915078 A EP 01915078A EP 1261808 A1 EP1261808 A1 EP 1261808A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pneumatic
- hydraulic
- membrane
- linear drive
- 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.)
- Granted
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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
- F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
Definitions
- the invention relates to a linear drive with an integrated pneumohydraulic pressure booster with the features of the preamble of claim 1.
- Such a linear drive is known from DE 197 58 159 AI, which has a pneumatic cylinder in which a pneumatic piston arrangement is axially adjustable.
- This pneumatic piston arrangement has two axially spaced end pistons, between which the pneumatic piston arrangement contains a hydraulic cylinder in which a plunger and a hydraulic piston are mounted axially adjustable.
- the plunger is led out of the hydraulic cylinder, the plunger penetrating the associated end piston of the pneumatic piston arrangement.
- the plunger is also attached to the pneumatic cylinder on a cylinder base that axially closes the pneumatic cylinder.
- the hydraulic piston drives a drive rod which is led out of the hydraulic cylinder and from the pneumatic cylinder on the side facing away from the plunger, the drive rod penetrating the associated end piston of the pneumatic piston arrangement and an associated cylinder base closing the pneumatic cylinder.
- An appropriate dimensioning forms an annular space between the plunger and the hydraulic cylinder, the volume of which depends on the axial position of the pneumatic piston arrangement relative to the plunger.
- the pneumatic piston arrangement also has a sleeve-shaped membrane radially enveloping the hydraulic cylinder, a hydraulic accumulator being formed radially between this membrane and the hydraulic cylinder and communicating with the interior of the hydraulic cylinder via a hydraulic connection.
- the hydraulic connection is open and the hydraulic piston is biased in the forward stroke direction of the drive rod and is stationary relative to the pneumatic piston arrangement.
- the pneumatic piston arrangement moves relative to the plunger, which moves out of the hydraulic cylinder. This on the one hand reduces the volume of the annular space and on the other hand increases the volume of the interior of the hydraulic cylinder filled with hydraulic fluid.
- hydraulic fluid flows from the hydraulic accumulator into the interior of the hydraulic cylinder.
- the hydraulic connection is blocked and the pneumatic piston arrangement moves relative to the hydraulic piston, so that the volume decreases in the annular space in the hydraulic cylinder Hydraulic piston driving high pressure builds up as soon as the drive rod meets an obstacle.
- the drive rod moves relative to the pneumatic cylinder with a relatively low lifting speed. Since a relatively low pneumatic pressure is converted into a relatively high hydraulic pressure inside the linear drive thus constructed, the linear drive has an integrated pneumohydraulic pressure intensifier.
- the present invention deals with the problem of designing a linear drive of the type mentioned at the outset in such a way that the entry of the pneumatic means into the hydraulic system of the linear drive is reduced.
- the invention is based on the general idea of forming a vented intermediate layer inside the membrane, which envelops the hydraulic accumulator.
- Under a "vent” is understood to mean the application of a degassing pressure which is lower than the pneumatic pressure prevailing on the outside of the membrane.
- the pneumatic means penetrating from the radially outside into the membrane reaches a maximum of the intermediate layer, since this is vented and the pneumatic gas can accordingly escape from the intermediate layer.
- the invention is based on the finding that the pneumatic means penetrates into the membrane or penetrates through the membrane when the pneumatic means is at an elevated pressure level. Accordingly, such a diffusion does not take place against an overpressure, but always in the direction of a pressure gradient.
- the deaerated intermediate layer can be formed, for example, by placing one half of the membrane over the other half.
- the membrane has an inner membrane and an outer membrane, between which the intermediate layer is formed. hereby This results in a particularly simple construction for a membrane with an intermediate layer.
- a plurality of axially extending grooves can be formed on at least one side facing the intermediate layer, which communicate with an annular groove running in circumferential direction, which in turn communicate with a pneumatic connection which applies the degassing pressure to the intermediate layer.
- a pneumatic biasing chamber radially enveloping the membrane can be provided, which communicates with a section of the pneumatic cylinder penetrated by the plunger and is sealed against a section of the pneumatic cylinder penetrated by the drive rod.
- essentially the same pneumatic pressure prevails in the prestressing chamber as in the section of the pneumatic cylinder penetrated by the plunger.
- the pneumatic piston arrangement can advantageously have a cylindrical sleeve which radially surrounds the membrane, the prestress chamber being formed radially between this sleeve and the membrane.
- the diaphragm can come into radial contact with the sleeve when the hydraulic accumulator is filled, so that a relatively large accumulator volume can be achieved for the hydraulic accumulator.
- FIG. 1 to 4 a longitudinal section through a linear drive according to the invention at different stroke positions
- Fig. 5 shows a longitudinal section through a membrane on an enlarged scale
- Fig. 6 shows a cross section corresponding to the section lines VI in Fig. 5 through an outer membrane on a different scale.
- a linear drive 1 has a pneumatic cylinder 2, which is closed at its axial ends by a cylinder base 3 or 4, respectively.
- a pneumatic piston arrangement 5 is axially adjustable.
- This pneumatic piston arrangement 5 has two axially spaced end pistons 6 and 7, between which a hydraulic cylinder 8 extends.
- the hydraulic cylinder 8 is surrounded radially on the outside by a sleeve-shaped membrane 9 made of a conventional elastic material, which is fastened at its axial ends to a receiving ring 10 and 11, respectively.
- Each of these receiving rings 10 and 11 is firmly connected to the associated end piston 5 and 6, respectively.
- the pneumatic piston arrangement 5 also has a cylindrical sleeve 12 which envelops the membrane 9 radially on the outside and extends axially from one end piston 6 to the other end piston 7, so that the receiving rings 10 and 11 are also accommodated in the sleeve 12.
- the sleeve 12 is dimensioned in such a way that an annular space 13 is formed radially between the sleeve 12 and the pneumatic cylinder 2, which is provided with a circumferential opening via at least one radial opening 14. 15 of the pneumatic cylinder 2 communicates.
- the annular space 13 is sealed off from the pneumatic cylinder 2 by radial seals 16 or 17, which are housed in the end pistons 6 and 7, respectively.
- the pneumatic piston arrangement 5 axially separates two chambers or sections 19 and 20 from one another in the pneumatic cylinder. 1 to 4, the left section 19 is formed axially between the left cylinder bottom 3 and the left end piston 6 and the right section 20 axially between the right cylinder bottom 4 and the right end piston 7.
- annular biasing chamber 18 Radially between the sleeve 12 and the membrane 9, an annular biasing chamber 18 is formed, which is sealed in the axial direction at one end with respect to the sleeve 12 and communicates with the left cylinder section 19 at its other end via a pneumatic connecting line 21.
- the prestressing chamber 18 is sealed off from the sleeve 12 here by a sealing collar 31 formed on the Merroran 9 and projecting radially therefrom.
- the connecting line 21 consists of a bore 22 penetrating the end piston 6, a bore 23 penetrating the receiving ring 10, a tap bore 24 and a radial gap 25 between the sleeve 12 and the receiving ring 10.
- a plunger 26 is fastened, which penetrates the left partial piston 6 in a sealed manner and which Hydraulic cylinder 8 penetrates, wherein an annular space 27 is formed radially between the hydraulic cylinder 8 and the plunger 26.
- an annular space 27 is formed radially between the hydraulic cylinder 8 and the plunger 26.
- another space extending in the axial direction could also be provided, which is formed, for example, by one or more axial grooves.
- a hydraulic piston 28 is also axially adjustable, which is drive-connected to a drive rod 29, which penetrates the right end piston 7 in a sealed manner and also penetrates the right cylinder base 4 in a sealed manner and thus protrudes axially from the pneumatic cylinder 2.
- a preceding end 30 of the drive rod 29 is only shown in FIG. 1, since the drive rod 29 in FIGS. 2 to 3 protrudes from the region that can be represented due to its stroke.
- An annular hydraulic accumulator 32 is formed radially between the membrane 9 and the hydraulic cylinder 8 and communicates with an interior 34 of the hydraulic cylinder 8 via a hydraulic connection 33.
- the hydraulic connection 33 consists of a branch line 35, an annular space 36 and a radial bore 37 which communicates with the hydraulic accumulator 32.
- a sleeve-shaped intermediate layer 38 is formed in the interior of the membrane 9 and communicates with the surroundings 15 via a pneumatic connection 39.
- the pneumatic connection 39 is hereby bordered by an intermediate layer 33.
- de annular groove 40, an annular space 41 communicatively connected thereto, a radial gap 42 between the receiving ring 11 and the sleeve 12 and an axial passage 43 between the receiving ring 11 and the associated end piston 7 are formed.
- the radial passage 43 communicates with the ring space 13 and thus via the radial opening 14 with the surroundings 15.
- While the right receiving ring 11 is pneumatically permeable to the sleeve 12 and to the end piston 7, 10 sealing means 44 are provided in the opposite receiving ring, which seal the left receiving ring 10 on the one hand against the sleeve 12 and on the other hand against the left end piston 6.
- a hydraulic connection 56 is formed in the left cylinder base 3 and communicates with the interior 34 of the hydraulic cylinder 8 via a central channel 58 in the plunger 26. Hydraulic fluid can be filled into the hydraulic cylinder 8 via this hydraulic connection 56, or can replenish missing hydraulic fluid as needed.
- this hydraulic connection 56 can be used with a pressure sensor 57 which monitors the hydraulic pressure in the hydraulic cylinder 8.
- This pressure sensor 57 is indicated by broken lines as an example in FIG. 1.
- the membrane 9 has a radially inner membrane 45 and a radially outer membrane 46.
- the intermediate layer 38 is formed radially between the inner membrane 45 and the outer membrane 46 and adjoins the annular groove 40 at the axial end shown on the right in FIG. 5.
- This annular groove 40 has at least one, here two, radial opening 47, which enables communication between the annular groove 40 and the annular space 41 (cf. FIGS. 1 to 4).
- the sealing collar 31 is formed on the outer membrane 46.
- the axial ends of the inner membrane 45 are formed by radially outwardly projecting ring collars 48 and 49, which radially overlap the outer membrane 46 on the outside.
- the axial ends of the outer membrane 46 are also in the form of radially outwardly projecting ring collars 50 and 51, the ring collars 48 and 49 of the inner membrane 45 and the ring collars 50 and 51 of the outer membrane 46 abutting against one another in an axially sealing manner.
- the annular collars 48 to 51 have on the mutually facing sides annular depressions 52 and projections 53 which are complementary to one another and engage axially with one another.
- a positive coupling of the two membranes 45, 46 is also achieved.
- the outer membrane 46 can have several axially on its inside 54 facing the inner membrane 45 running grooves 55 may be provided, which are preferably distributed in a star shape along the inner circumference of the outer membrane 46.
- the axial grooves 55 each communicate with the annular groove 40.
- the linear drive 1 according to the invention works as follows:
- a pneumatic high pressure in the left cylinder section 19 drives the pneumatic piston arrangement 5 to the right. Since the driving pneumatic pressure also prevails in the preload chamber 18, it is transmitted to the hydraulic medium and thus to the interior 34 of the hydraulic cylinder 8 via the open hydraulic connection 33. Accordingly, the hydraulic piston 28 is biased into its right end position. As long as the hydraulic connection 33 is open, the hydraulic piston 28 and thus also the drive rod 29 are stationary relative to the hydraulic cylinder 8 and consequently relative to the pneumatic piston arrangement 5. Accordingly, the drive rod 29 is adjusted to the right at the same speed as the pneumatic piston arrangement 5.
- FIG. 1 shows the starting position for a forward stroke of the drive rod 29
- FIG. 2 shows a position in which the pneumatic piston arrangement 5 and thus the drive rod 29 have already shifted to the right.
- the adjustment movement of the pneumatic piston arrangement 5 results in a relative adjustment between the plunger 26 and the hydraulic cylinder 8. Accordingly, the volume of the interior 34 of the hydraulic cylinder 8 enlarged.
- Hyorau__ ⁇ km ⁇ ttel can flow from the hydraulic accumulator 32 into the interior 34 through the open hydraulic connection 33. Due to the bias of the diaphragm 9 is in this case rologicalt ge stii h that it ydraulikzy- from oe ⁇ at Herausbewege ⁇ of the plunger 26 does not come relieving 8 ltatserschemieux to Ka '.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Servomotors (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10011002 | 2000-03-07 | ||
DE10011002A DE10011002C2 (de) | 2000-03-07 | 2000-03-07 | Linearantrieb mit integriertem pneumohydraulischen Druckübersetzer |
PCT/DE2001/000827 WO2001066958A1 (de) | 2000-03-07 | 2001-03-06 | Linearantrieb mit integriertem pneumohydraulischen druckübersetzer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1261808A1 true EP1261808A1 (de) | 2002-12-04 |
EP1261808B1 EP1261808B1 (de) | 2004-04-28 |
Family
ID=7633788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01915078A Expired - Lifetime EP1261808B1 (de) | 2000-03-07 | 2001-03-06 | Linearantrieb mit integriertem pneumohydraulischen druckübersetzer |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1261808B1 (de) |
AT (1) | ATE265623T1 (de) |
DE (2) | DE10011002C2 (de) |
WO (1) | WO2001066958A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2243144B1 (es) * | 2004-12-28 | 2007-02-16 | Enrique Angel Vidal Ramo | Sistema de control de un brazo mecanico. |
RU2559079C1 (ru) * | 2014-05-19 | 2015-08-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный нефтегазовый университет" (ТюмГНГУ) | Гидроцилиндр с обводом |
CN111283672A (zh) * | 2018-12-10 | 2020-06-16 | 北华大学 | 环形截面气动柔性轴向驱动器 |
DE102019216453A1 (de) | 2019-10-25 | 2021-04-29 | Robert Bosch Gmbh | Hydrostatischer Zylinder mit Gasdruckspeicher |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2945353A (en) * | 1956-08-23 | 1960-07-19 | Glas Maurus | Hydraulic cylinder unit |
DE2258593A1 (de) * | 1972-11-30 | 1974-06-12 | Erhard Stueber | Druckgasbetaetigter zylinder mit hydraulischer kraftverstaerkung |
DE2522380A1 (de) * | 1975-05-21 | 1976-12-02 | Teves Gmbh Alfred | Druckspeicher |
DE19758159C2 (de) * | 1997-01-04 | 1999-12-09 | Heinrich Van De Loecht | Linearantrieb mit integrierten pneumohydraulischen Druckübersetzer |
-
2000
- 2000-03-07 DE DE10011002A patent/DE10011002C2/de not_active Expired - Fee Related
-
2001
- 2001-03-06 DE DE50102134T patent/DE50102134D1/de not_active Expired - Lifetime
- 2001-03-06 AT AT01915078T patent/ATE265623T1/de not_active IP Right Cessation
- 2001-03-06 WO PCT/DE2001/000827 patent/WO2001066958A1/de active IP Right Grant
- 2001-03-06 EP EP01915078A patent/EP1261808B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0166958A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10011002A1 (de) | 2001-09-27 |
ATE265623T1 (de) | 2004-05-15 |
WO2001066958A1 (de) | 2001-09-13 |
DE50102134D1 (de) | 2004-06-03 |
EP1261808B1 (de) | 2004-04-28 |
DE10011002C2 (de) | 2002-01-31 |
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