EP0476375B1 - Teleskopierzylindersystem - Google Patents

Teleskopierzylindersystem Download PDF

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Publication number
EP0476375B1
EP0476375B1 EP91114400A EP91114400A EP0476375B1 EP 0476375 B1 EP0476375 B1 EP 0476375B1 EP 91114400 A EP91114400 A EP 91114400A EP 91114400 A EP91114400 A EP 91114400A EP 0476375 B1 EP0476375 B1 EP 0476375B1
Authority
EP
European Patent Office
Prior art keywords
telescopic cylinder
pressure
valve
extension
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 - Lifetime
Application number
EP91114400A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0476375A3 (en
EP0476375A2 (de
Inventor
Günther Bartmann
Gerd BRÄCKELMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Montan Hydraulik GmbH and Co KG
Original Assignee
Montan Hydraulik GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Montan Hydraulik GmbH and Co KG filed Critical Montan Hydraulik GmbH and Co KG
Publication of EP0476375A2 publication Critical patent/EP0476375A2/de
Publication of EP0476375A3 publication Critical patent/EP0476375A3/de
Application granted granted Critical
Publication of EP0476375B1 publication Critical patent/EP0476375B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type

Definitions

  • the invention relates to a telescopic cylinder system of the type outlined in the preamble of claim 1. Such a telescopic cylinder system is described except for the implementation in US-A-4,125,974.
  • the second telescopic cylinder is pressurized on the exit side by branching the exit pressure medium line between the control slide and the first telescopic cylinder.
  • the branch line acting on the second telescopic cylinder must be designed as a hose line.
  • DE-A-33 24 270 shows a pressure medium on the exit side of the second telescopic cylinder of a copying cylinder system comprising a second telescopic cylinder via a bushing extending through the first telescopic cylinder.
  • the object of the invention is, in the case of telescopic cylinder systems formed from at least two telescopic cylinders, also the perfect retraction of the telescopic cylinders with reduced expenditure on line guides for the pressure medium for actuating the cylinders, as well as safeguards for the cylinder pressure chambers or the pressure medium lines while maintaining comparatively small cylinder cross sections, in which case an optional driving sequence of at least some of the stages of the system should also be possible.
  • first single-stage telescopic cylinder with a second two-stage telescopic cylinder
  • second two-stage telescopic cylinder can be a cylinder with a forced driving sequence or a cylinder with an optional driving sequence of the stages.
  • the new telescopic cylinder system is primarily intended for telescopic booms with limited space available for the telescopic cylinder system.
  • the telescopic cylinder 11 consists of the single-stage telescopic cylinder 11 with a stationary (31) piston 111 and the telescopic cylinder 21 assigned in the opposite direction to the telescopic cylinder 11, the cylinder 112 of the single-stage telescopic cylinder 11 being mechanically rigidly connected to the cylinder 211 of the two-stage telescopic cylinder (32 ) is.
  • the lines emanating from the control slide 41 namely the extension pressure medium line 42 and the inlet pressure medium line 43, are located on the end face of the piston 111.
  • the extension pressure medium line 42 extends into a telescopic manner through the telescopic cylinder 11 to the bottom 113 of the cylinder 112 extending passage 114, 115 via.
  • the inlet pressure medium line 43 opens into the interior 116 of the piston 111, which is connected to the annular space 117 formed between the cylinder 112 and the piston 111 (118).
  • the cylinder pressure space is designated 119.
  • the two-stage telescopic cylinder 21 assigned to the one-stage telescopic cylinder 11 is a telescopic cylinder with the forced travel sequences first stage or intermediate piston 212 - second stage or end piston 213 when extending and second stage 213 - first stage 212 when retracting.
  • the exit pressure medium line 441 opening into the exit pressure space 216 of the cylinder 211 is a branch line of the exit-side connecting line 44 extending from the bushing 114, 115 in the first telescopic cylinder 11 between the first telescopic cylinder 11 and the second telescopic cylinder 21.
  • the line 441 is secured by the check valve 46 which can be opened and the inlet pressure medium line 45 on the annulus side, starting from the annulus 117 of the first telescopic cylinder 11, by a check valve / directional valve combination 47, which makes it possible to extend the telescopic cylinder 21 in a differential circuit.
  • the branch line 441 of the connecting line 44 is secured by the valve combination IVA which can be seen in FIG.
  • valve combination IVB which can be seen in FIG. 4b. Both valve combinations are explained with reference to Figures 4a and 4b. With this system, the extension and the retraction order of the stages of the second cylinder are predefined, but the cylinders themselves can be moved optionally.
  • the telescopic cylinder system according to FIG. 2 differs from that according to FIG. 1 in that the second telescopic cylinder 21 '- again a two-stage cylinder - is a telescopic cylinder with an optional extension and retraction sequence of its two stages 212' and 213 '.
  • each of the extension pressure spaces that is, the extension pressure space 119 of the first telescopic cylinder 11 and the extension pressure spaces 216 and 217 of the second cylinder 21 ', is protected by a circuit IVB according to FIG. 4b if the circuit according to FIG. 4a is omitted.
  • all stages of the system can be moved as desired.
  • the telescopic cylinder system according to FIG. 3 is composed of two two-stage telescopic cylinders 11 'and 21'.
  • the stages of this cylinder can also be any Driving sequence can be extended and retracted.
  • the sequence intermediate stage - final stage (stage formed by the cylinder) when extending and final stage - intermediate stage when retracting are preferred for structural reasons.
  • the conventional protection (in particular Fig. 4a) inserted into the connecting line 441 between the first telescopic cylinder 11 and the second telescopic cylinder 21 of the telescopic cylinder system in FIG. 1 consists of a lockable check valve 51 with a spring-loaded (53) closing body 52 inserted into the line 441 a pilot valve associated with this valve 51 in the form of a 3/2-way solenoid valve 54, via which the rear side of the main valve can be acted upon by pump pressure (connection 55) and pressure chamber pressure (connection 56).
  • the pump or extension pressure is present behind the closing body 52 of the valve 51, in the second circuit, not shown, the pressure from the extension pressure spaces 216, 217 of the telescopic cylinder 21 (FIG. 1).
  • This opens up the possibility of either first blocking the flow of pressure medium to the pressure chamber 216 of the telescopic cylinder 21 or else the discharge of pressure medium from the exit pressure spaces 216, 217 of the telescopic cylinder 21, with the valve in each case having the opposite flow.
  • the valve 51 is therefore blocked for the pump pressure, nevertheless there is the possibility of opening the valve via the pressure present in the extension pressure chambers.
  • pressure medium present in the pressure chambers can thus flow out via the valve 51 when the running-in process is initiated.
  • Another circuit not shown, opens up the possibility of transferring pressure medium into the extension pressure spaces 216, 217 in order to extend the telescopic cylinder 21.
  • This circuit then also prevents the outflow of pressure medium from the extension pressure chambers 216, 217 of the telescopic cylinder 21 in the holding situation, since the pressure in the extension pressure chamber is also present behind the closing body 52 of the valve 51 via the switched pilot valve 54.
  • this safeguard has the disadvantage that when the retraction process is initiated there are voltage shocks and then a spontaneous pressure reduction, and thus an uncontrolled retraction of the telescopic cylinder, a disadvantage that naturally does not occur when the telescopic cylinder is extended.
  • the known circuit can still remain in the connecting line between the first telescopic cylinder of a telescopic system formed by two telescopic cylinders to the second cylinder in any case if the second cylinder is additionally secured, as is the case with the telescopic system according to FIG. 1, as a second cylinder provides a two-stage cylinder moving in a forced driving sequence, in which the cylinder spaces are secured by independent check valves operated from the system.
  • the safeguard according to FIG. 4b is used according to the invention.
  • a blockable check valve 61 is inserted, in the spring-loaded (63) closing body 62 a spring-loaded (65) in the closed position blocking the passage to the rear of the closing body 62 pilot poppet 64 is integrated.
  • a control piston 71 Upstream of the valve 61 is a control piston 71 which assumes its starting position under spring pressure 72 and which ends in a control range 711. Behind the control piston 71 is a 2/2-way solenoid valve 81 with the corresponding switching of the valve via the control line 48 of the annulus side pressure.
  • the valve 61 is also assigned a 3/2-way solenoid valve 82, via which the pump pressure and the pressure chamber pressure are present on the closing body 62 of the valve 61, depending on the position of the solenoid valve 82, in a departure from the known protection (FIG. 4a), the magnetic valve 82 is preceded by a shuttle valve 83, on the connections of which the pressure chamber side and the pump side are located.
  • each of the pressures can build up behind the closing body 62 of the valve 61.
  • the valve is blocked.
  • only the pressure from the extension pressure space, for example 119, is present behind the valve 61 and the valve 61 opens during the extension process under the influence of the higher pump pressure that is present in front of it.
  • the opening of the valve 61 which is then also necessary when retracting, presupposes the transfer of the solenoid valve 81 into the other switching position, so that pressure present on the annular space side (48) can get behind the control piston 71. Controlled opening takes place via the control piston 71 which is displaced against the closing body 62 of the valve 61 of the valve 61.
  • control piston 71 initially runs with its control range 711 itself, interrupting the cable line 442 against the pilot cone 64 integrated in the closing body 62 of the valve 61, opening it so that pressure medium on the pressure chamber side can flow over and flow through the control piston 71 (712) is then also present on an annular shoulder 713 of the control piston 71, so that the control piston 71 is in this respect in pressure compensation.
  • control piston 71 moves steadily in the direction of the closing body 62, it finally runs against the closing body 62 itself and lifts it from its seat.
  • the control piston 71 After the control piston 71 has initially assumed a closed position with its control region 711, it then releases the passage in the cable line 442 via control grooves 714 of continuously increasing flow cross section. This ensures the desired controlled retraction.
  • the control piston 71 returns to its starting position under the action of the return spring 72. This is accompanied by the steady transition of the closing body 62 of the valve 61 and then of the pilot cone 64 into the closed position.
  • the openable check valve 49 with throttle function inserted into the extension pressure medium line between the control slide 41 and the first telescopic cylinder 11 'in the telescopic cylinder system according to FIG. 3 prevents the spontaneous pressure reduction in the intermediate stage of this telescopic cylinder when retracting.
  • the advantage of the new circuit is primarily to be seen in the fact that you can ensure the controlled retraction with two hydraulic connecting lines between the telescopic cylinders that make up the telescopic system get along, accordingly with two lines for connecting the system on the one hand to the pump and on the other hand to the tank.
  • the solenoid valves upstream of the exit pressure chambers, with which the main valves can be blocked, allow the extension and retraction sequence to be specified without additional hydraulic valves, whereby it must be taken into account that the electrical connections required for the solenoid valves are not as problematic as the connections for hydraulically operated valves, and electrical lines extend over the entire length of the cylinder anyway.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
EP91114400A 1990-09-18 1991-08-28 Teleskopierzylindersystem Expired - Lifetime EP0476375B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4029579A DE4029579A1 (de) 1990-09-18 1990-09-18 Teleskopierzylindersystem
DE4029579 1990-09-18

Publications (3)

Publication Number Publication Date
EP0476375A2 EP0476375A2 (de) 1992-03-25
EP0476375A3 EP0476375A3 (en) 1993-01-13
EP0476375B1 true EP0476375B1 (de) 1995-11-02

Family

ID=6414485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114400A Expired - Lifetime EP0476375B1 (de) 1990-09-18 1991-08-28 Teleskopierzylindersystem

Country Status (2)

Country Link
EP (1) EP0476375B1 (enrdf_load_stackoverflow)
DE (2) DE4029579A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2282762C1 (ru) * 2005-03-28 2006-08-27 Валерий Владимирович Бодров Способ управления длинноходовым гидроцилиндром
RU2282761C1 (ru) * 2005-03-28 2006-08-27 Валерий Владимирович Бодров Способ управления многополостным гидроцилиндром
DE102014018617A1 (de) * 2014-12-13 2016-06-16 Wabco Gmbh Dreistellungszylinder, insbesondere als Getriebesteller

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507416A1 (de) * 1975-02-21 1976-08-26 Hunger Walter Kg Anordnung zweier parallel zueinander ein- oder mehrstufiger geschalteter teleskopzylinder
DE2719848C2 (de) * 1977-05-04 1985-09-26 Montanhydraulik Gmbh & Co Kg, 4755 Holzwickede Mehrstufiger hydraulischer Teleskopzylinder
US4125974A (en) * 1977-07-08 1978-11-21 Harnischfeger Corporation Control system for telescopic boom
DE3324270C2 (de) * 1983-07-06 1986-08-07 Montanhydraulik GmbH, 4755 Holzwickede Teleskopierzylinder-System
DE3806390A1 (de) * 1988-02-29 1989-09-07 Walter Hunger Teleskopierzylindersystem

Also Published As

Publication number Publication date
DE4029579A1 (de) 1992-03-19
EP0476375A3 (en) 1993-01-13
DE59106814D1 (de) 1995-12-07
DE4029579C2 (enrdf_load_stackoverflow) 1992-10-01
EP0476375A2 (de) 1992-03-25

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