US3782246A - Hydraulically operated vibration drives - Google Patents

Hydraulically operated vibration drives Download PDF

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Publication number
US3782246A
US3782246A US00269431A US3782246DA US3782246A US 3782246 A US3782246 A US 3782246A US 00269431 A US00269431 A US 00269431A US 3782246D A US3782246D A US 3782246DA US 3782246 A US3782246 A US 3782246A
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US
United States
Prior art keywords
jet
drive piston
pressure
drive
receiving
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Expired - Lifetime
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US00269431A
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English (en)
Inventor
J Hilbrands
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Maschinenfabrik Koeppern GmbH and Co KG
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Maschinenfabrik Koeppern GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses

Definitions

  • ABSTRACT A vibratory drive comprises a double acting power piston arranged to be reversed by position detecting jet sensing means. The latter are connected with a reversing valve via bistable fluidics storage means.
  • the present invention relates to hydraulically operated vibration drives and, more particularly, to such drives which comprise a thrust piston unit which is double acting, a reversing valve and a hydraulic or pneumatic auxiliary control system with control elements whose signals are supplied to the reversing elements of the reversing valve which are operated in accordance with the position of the working piston.
  • valves to be provided for auxiliary control, were opened by the operating piston at its end position. Via the valves, respective control pistons were acted upon by compressed air and a reversing valve was actuated by the control pistons. The reversing valve served for passing compressed air in alternate directions to the working piston.
  • the auxiliary control valves are arranged either in the cylinder heads, in which case they have an actuating projection extending into the cylinder spaces of the drive and are operated directly by the working piston, or they are operated via a two-armed lever one arm of which engages the working or power piston and another arm of which cooperates with the control piston.
  • One object of the present invention is to provide a displacement controlled drive which may be essentially manufactured from commercially available components and in which the terminal positions of the thrust piston drive unit can easily be adjusted.
  • a further object of the present invention is to provide a vibratory drive which is capable of operating with frequencies greater than one Hertz and up to a few tens of Hertz.
  • Such drives can'be used, for example, as shaking drives, drives for fatigue testing machines, and the like.
  • control elements are provided in the path of movement of the piston rod of the working piston or a part moved by it in the two desired end positions by arranging pneumatic jet receiving nozzles which are respectively disposed to feed signals to a bistable fluidics storage means, so as to serve as reversing signals and the output signals of the storage means are supplied directly or in-' directly to the switch-over elements of the reversing valve.
  • a signal amplifier is provided between respective outputs of the storage means and the switch-over or reversing elements of the reversing valve.
  • This amplifier can preferably be a low pressure-normal pressure transducer.
  • the vibratory drive in accordance with the invention by arranging a number of jet receiving nozzles in two rows in the path of movement and providing means with which one of the receiving nozzles can be connected with the control circuit.
  • the drive shown in the accompanying drawing comprises a double acting thrust piston drive 2 with a piston 4 and a continuous piston rod 6 connected thereto.
  • the working surfaces of the piston are equal in extent in the two cylinder spaces 8 and 10 of the thrust piston.
  • the load is denoted by the arrow L.
  • the cylinder spaces 8 and 9 are connected via ducts l6 and 18 with the output connections A and B of a reversing valve 20 which can be of conventional construction and of the commercially available type and is controlled by fluid pressure.
  • a fluid pump 22, which can be regulated, is connectedj-via a duct 24, 27 with the pressure connection P of the reversing valve 20.
  • the duct 24 is connected with a conventional pressure release valve 26 and a pressure accumulator 28.
  • a duct 30 to the tank 32.
  • a biasing choke 31 is arranged, which can also be adjustable. The choke serves to ensure that in the case of an elastic stressing, which together with the mass of the working or power piston has a natural frequency, this natural frequency does not influence the working frequency of the vibratory drive.
  • the operating or working frequency is determined by the output rate of the pump 22.
  • These jet discharge and receiving nozzles may be of the type described, for example, in US. Pat. No. 3,071,157 or 3,457,940 or commercially available from Elliott Automation GmbH, West Germany.
  • the discharge nozzles are supplied, via duct 35, pressure reducer 37 duct and air source 8 1, with a fluid supply to be discharged therefrom and directed onto the corresponding jet receiving nozzles.
  • These fluid pressure transducer and amplifiers are low pressure/- normal pressure amplifiers and may be of the type described in US. Pat. Nos. 3,138,168, 3,150,674 or 3,530,894, or commercially available from the abovementioned GmbI-l.
  • the amplified signals from these transduceramplifiers are fed via ducts 40, 40' to a bistable storage means 42, which is constructed in the form of a pneumological bistable vibrator and can, for example, be in the form of a pulse controlled flip-flop.
  • a bistable storage means may be of the type disclosed, for example, in US. Pat. No. 3,322,148 of US. Pat. No. 3,285,608, or of the type commercially available from the above-mentioned source.
  • pressure transducer amplifier elements 38 and 38 as well as bistable storage means 42 are supplied with a source of fluid pressure via duct or conduit 80.
  • the outputs 44, 44' of the storage means 42 are connected via ducts 46, 46' with amplifiers and pilot valves 48, 48, with which the actuating pressure spaces 50, 50', for the switch-over elements 20a and 20b of the valve 20, are connected alternately with the pressure source 52 and a pressure-less return flow 54.
  • auxiliary control or pilot valves may be of the type disclosed, for example, in US. Pat. No. 3,279,484 or 3,529,629, or commerially available as discussed above.
  • all signals of the auxiliary control means including the signals supplied to the control chambers 50, 50, are pneumatic signals. It would naturally be possible, also, to provide a pneumatically actuated hydraulic pre-control valve for the actuation of the reversing valve 20, the hydraulic valve then being actuated directly with the output signals of the storage means 42.
  • the drive arrangement operates as follows.
  • a fluid (oil) under pressure is conveyed by the pump 22 via the duct 24, the reversing valve 20 and the duct 16 into the cylinder space 8, while from the cylinder space oil flows back via duct 18, the reversing valve and the duct 30 into the tank 32.
  • the piston is therefore moved to the right.
  • the right hand end of the piston rod 6 is detected by the jet detecting means 34.
  • the duct 36 there appears a pneumatic signal at low pressure, which is amplified in the low pressure-normal pressure transducer 38 and is supplied, via the duct 40, to the bistable storage means 42.
  • This bistable storage means 42 is thus switched from its previous operational condition in which, at the output 44' there was a signal, into a condition in which, at the output 44' no signal appears, while at the output 44 a signal now appears.
  • This signal is supplied via duct 46 to amplifier 48, which then connects the compressed air source 52 with the actuating pressure space 50 of the valve and switches-over this valve.
  • the oil under pressure then flows into the cylinder space 10 and the piston 4 is moved to the left until the left hand end of the piston rod 6 is detected by the jet detecting means 34, so that the storage means 42 will receive a signal via duct 40 for switching over, so that at the output 44 a signal again appears, while at the output 44 there is no signal. With this signal the reversing valve 20 is then switched over again via the amplifier 48.
  • the jet detecting means 34, 34 preferably do not cooperate directly with the piston rod 6 but, instead, with vanes and the side of the piston rod.
  • both jet detecting means 34, 34' can be arranged on one side of the thrust piston drive unit, which can thus also be constructed with a piston rod extending only to one side.
  • the spacing of the two jet detecting means then corresponds with the pre-set displacement of the piston 4 between the two switchingover points.
  • the jet detecting means can also cooperate with a component moved by the thrust piston drive unit. This unit drive can then include, in some cases, a step-up or step-down transmission or linkage system, if required.
  • a particular advantage of the reversal by means of jet detecting means is that they operate without making physical contact with each other, so that at working frequencies between 1 and Hertz wear, which would occur with mechanically operated control elements, is avoided.
  • jet detecting means for one or both end positions, which are capable of being driven by a servomotor such as motor 60, connected by way of a linkage arrangement 61-62 to jet detecting means 34, the output of which is connected to pressure transducer amplifier 38 through a duct including a flexible hose 63.
  • the servo-motor can then be controlled by a conventional program control means 70.
  • the jet detecting means for the two terminal switching operations can be arranged on a common carrier which can be displaced by a servo-motor. In this manner, the working range can be displaced as a whole, for example, in order to follow a yielding load, as is the case with compacting equipment.
  • a thrust piston drive which is only single acting and which, for example, is moved back again by the load applied.
  • the reversing valve only needs to be a 2/2 displacement valve with an actuating pressure space and a return spring.
  • the storage means then only needs to have one output which alternately passes a signal and is free of a signal.
  • control circuit has been described principally with reference to the use of pneumatically driven fluidics elements. It can, however, be used partially or completely with liquid driven fluidics elements.
  • a particular advantage of the drive in accordance with the invention is to be found in that commercially available elements, such as those available from the avove-mentioned Elliott Automation Gmbl-l, General Fluidics Corpororation, Paterson, New Jersey, or Fluicon Corporation, Hackensack, New Jersey, for example, can be used for the various elements such as for the auxiliary control, for example, with very small dimensions and low costs of production, so that it is possible to construct the whole auxiliary storage means in a very compact manner. Furthermore, by the use of such commercially availableelements any problem of replacement is considerably simplified.
  • a fluid operated vibratory drive system comprising:
  • a drive piston arranged in said drive cylindersuch that said drive cylinder and drive piston define first and second drive cylinder pressure chambers which are partially bounded by respective differently facing pressure surfaces of said drive piston
  • a first fluid pressure source for supplying fluid medium under pressure
  • valve means interposed between said first pressure source and said first and second line means for selectively communicating said first pressure source with one of said first and second line means such that said drive piston is forcibly moved in a first direction when said first line means is communicated with said first pressure source and such that said drive piston is forcibly moved in a second direction opposite said first direction when said second line means is communicated with said first pressure cource,
  • drive piston position detecting means including means for supplying drive piston position control signals indicative of detected predetermined opposite end positions of said drive piston which occur during movement of said drive piston in response to pressure supplied to said first and second line means,
  • reversing valve control means responsive to said drive piston position control signals for controlling said reversing valve means in such a manner that said reversing valve effects a reversal of the connection between said first pressure source and said first and second line means in response to movement of said drive piston to said predeermined respective opposite end positions;
  • said drive piston position detecting means includes:
  • said first pressure source includes means for supplying a first fluid medium under pressure to said reversing valve means
  • said second pressure source includes means for supplying a second fluid medium, different from said first medium, under pressure to said jet discharge nozzle means.
  • said adjusting means is separate from said drive cylinder and drive piston, whereby the travel path of said drive piston can be varied while utilizing an unchanged drive piston and drive cylinder configuration.
  • said reversing valve conrol means includes reversing valve switchover elements and a bistable fluidics storage means having means for accepting said drive piston position control signals as input signals and means for supplying output signals to control operation of said reversing valve switch-over elements.
  • said reversing valve means includes first and second switchover elements, a first one of which is coupled to a first output of said storage means and a second one of which is connected to a second output of said storage means and further including first and second amplifier means for connecting the outputs of said storage means to said respective switch-over elements of said reversing valve means.
  • each of said first and second amplifier means includes a pilot valve and amplifier connected to an auxiliary unit for supplying an exhausting control fluid to said reversing valve means.
  • said jet detecting means comprises a plurality of jet detectors disposed along the axis of movement of said piston rod.
  • switch-over elements include compressed air responsive means for moving said reversing valve means.
  • said signal amplifying means includes a low pressure normal pressure transducer.
  • said jet detecting means comprise a plurality of jet detectors, each including a discharge nozzle and a receiving jet, disposed along the axis of movement of said piston rod, and wherein said adjusting means includes means for selectively communicating and interrupting flow to said receiving jet line means from at least one of the receiving jets of respective jet detectors.
  • jet detecting means are arranged so as to be adjustable in a direction parallel to the direction of movement of the piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US00269431A 1969-07-11 1972-07-06 Hydraulically operated vibration drives Expired - Lifetime US3782246A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691935253 DE1935253B2 (de) 1969-07-11 1969-07-11 Hydraulisch betriebener vibrationsantrieb

Publications (1)

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US3782246A true US3782246A (en) 1974-01-01

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US00269431A Expired - Lifetime US3782246A (en) 1969-07-11 1972-07-06 Hydraulically operated vibration drives

Country Status (5)

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US (1) US3782246A (de)
AT (1) AT306474B (de)
AU (1) AU1738570A (de)
CH (1) CH526998A (de)
DE (1) DE1935253B2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398463A (en) * 1981-08-19 1983-08-16 Motter Printing Press Co. Non-repeat doctor blade drive
US4479553A (en) * 1981-03-17 1984-10-30 Tonino Virgili Pneumatically actuated and controlled device for carrying out operations on electronic components
US5765374A (en) * 1994-05-31 1998-06-16 Linear Energy Corporation Limited Gas driven mechanical oscillator and method
US20070186974A1 (en) * 2006-02-13 2007-08-16 Stefan Kolbenschlag Transducer of an electrical input signal into pneumatic output signals
US20100064676A1 (en) * 2007-03-01 2010-03-18 Luis Olvera Diaz The Operation of a Pressure Generator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185040A (en) * 1963-04-15 1965-05-25 American Brake Shoe Co Hydraulic reciprocating system
US3225663A (en) * 1963-04-09 1965-12-28 Hispano Suiza Sa Hydraulic control systems including double action receiver apparatus
GB1161696A (en) * 1966-10-31 1969-08-20 Berk Ltd Improvements in or relating to Fluid Pressure-actuated Reciprocating Motors
US3552269A (en) * 1968-03-27 1971-01-05 Krupp Gmbh Hydraulically operable linear motor
US3604310A (en) * 1968-01-16 1971-09-14 Nat Res Dev Transducer for producing mechanical oscillations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225663A (en) * 1963-04-09 1965-12-28 Hispano Suiza Sa Hydraulic control systems including double action receiver apparatus
US3185040A (en) * 1963-04-15 1965-05-25 American Brake Shoe Co Hydraulic reciprocating system
GB1161696A (en) * 1966-10-31 1969-08-20 Berk Ltd Improvements in or relating to Fluid Pressure-actuated Reciprocating Motors
US3604310A (en) * 1968-01-16 1971-09-14 Nat Res Dev Transducer for producing mechanical oscillations
US3552269A (en) * 1968-03-27 1971-01-05 Krupp Gmbh Hydraulically operable linear motor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479553A (en) * 1981-03-17 1984-10-30 Tonino Virgili Pneumatically actuated and controlled device for carrying out operations on electronic components
US4398463A (en) * 1981-08-19 1983-08-16 Motter Printing Press Co. Non-repeat doctor blade drive
US5765374A (en) * 1994-05-31 1998-06-16 Linear Energy Corporation Limited Gas driven mechanical oscillator and method
US5865040A (en) * 1994-05-31 1999-02-02 Linear Energy Corporation Limited Gas driven mechanical oscillator and method
US6067796A (en) * 1994-05-31 2000-05-30 Linear Energy Corporation Limited Gas driven mechanical oscillator and method
US6247332B1 (en) 1994-05-31 2001-06-19 Linear Energy Corporation Limited Gas driven mechanical oscillator and method
US20070186974A1 (en) * 2006-02-13 2007-08-16 Stefan Kolbenschlag Transducer of an electrical input signal into pneumatic output signals
US7802585B2 (en) * 2006-02-13 2010-09-28 Samson Aktiengesellschaft Transducer of an electrical input signal into pneumatic output signals
US20100064676A1 (en) * 2007-03-01 2010-03-18 Luis Olvera Diaz The Operation of a Pressure Generator

Also Published As

Publication number Publication date
AT306474B (de) 1973-04-10
DE1935253B2 (de) 1972-07-13
CH526998A (de) 1972-08-31
DE1935253A1 (de) 1971-02-04
AU1738570A (en) 1972-01-13

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