EP0085279B1 - Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques - Google Patents

Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques Download PDF

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Publication number
EP0085279B1
EP0085279B1 EP82830014A EP82830014A EP0085279B1 EP 0085279 B1 EP0085279 B1 EP 0085279B1 EP 82830014 A EP82830014 A EP 82830014A EP 82830014 A EP82830014 A EP 82830014A EP 0085279 B1 EP0085279 B1 EP 0085279B1
Authority
EP
European Patent Office
Prior art keywords
piston
sleeve
control valve
fluid
pressure
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
Application number
EP82830014A
Other languages
German (de)
English (en)
Other versions
EP0085279A1 (fr
Inventor
Mauro Vitulano
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE8282830014T priority Critical patent/DE3271910D1/de
Priority to EP82830014A priority patent/EP0085279B1/fr
Priority to AT82830014T priority patent/ATE20647T1/de
Publication of EP0085279A1 publication Critical patent/EP0085279A1/fr
Application granted granted Critical
Publication of EP0085279B1 publication Critical patent/EP0085279B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/002—Pressure accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston

Definitions

  • the invention relates to a directional control valve, that is a device making use of a sleeve valve to supply or return incompressible fluid from a cylinder, e.g. of a hydraulic hammer, in which a piston operating to charge and fire a tool has to be effected to an alternate motion.
  • a directional control valve that is a device making use of a sleeve valve to supply or return incompressible fluid from a cylinder, e.g. of a hydraulic hammer, in which a piston operating to charge and fire a tool has to be effected to an alternate motion.
  • a cylindrical control valve i.e. a sleeve coaxial to the cylinder in which the piston moves.
  • control valves as well as being subjected to continuous and strong stresses, need complex circuits for oil discharge, little working tolerances and frontal fluid tight joints that may fail owing to abnormal wear caused by repeated impacts.
  • the mobile member that is the sleeve is really struck by the same piston which acts as a shoulder, and elastic devices, as spring cushions, don't minimize the stresses the control valve is subjected to.
  • a directional control valve of a hydraulically operated percussion device in which a sleeve-like shaped valve member responsive to the movements of the piston is contained in a pressure chamber for alternately connecting said chamber to a channel system including a high pressure and low pressure branch for conducting hydraulic pressure fluid to and from said pressure chamber.
  • the invention solves the problem of how to design a double acting directional control valve for hydraulically operated percussion devices, in which the stresses transmitted to the piston by the tool in operation subjected to an alternate motion, are not taken by the valve device, thereby averting any risk of damage to the mobile distributing valve element in the form of a sleeve-shaped slide element.
  • the invention solves also the problem relative to cutting the maintenance costs of the hydraulically operated percussion devices with a control system less complex, and therefore manufactured at a lower cost because of its simplicity.
  • control valve includes a cylindrical sleeve-shaped distribution valve member 5, positioned in same cylindrical chamber 1 in which the piston moves.
  • the sleeve-shaped element (1) has an outwardly directed flange means 6 forming an annular rim 5a that strikes against face 1b of annular groove 1a forming an annular chamber in the wall of the cylindrical chamber 1, limiting the stroke of the sleeve element 5.
  • This cylindrical chamber 1 having a diameter D 1 is coaxially connected to the cylindrical chamber 2A having a diameter D 4 inferior to D 1 , through annular groove 3 having a diameter D 3 greater than D 1 , but smaller than the diameter D 2 of the above groove 1a in order to form a second circular shoulder 4 for limiting the stroke of the sleeve 5 itself in the other direction and submit to a greater thrust the rim 5a having an area higher than the area of the opposite rim 5b of the sleeve-shaped element 5.
  • the sleeve-shaped element works so that it can permit the moving up of piston 7 which has two different diameters D 7 (A) and (C) D 8 , where D 7 is greater than D 8 , to compress a gas (e.g. nitrogen) contained in a hermetic compression chamber 11.
  • a gas e.g. nitrogen
  • Piston upstroke and downstroke speed are respectively related with pump delivery capacity and with expansion speed of gas compressed in the chamber 11.
  • the sleeve-shaped element 5 surrounds the section A of piston 7 that enters in the chamber 1 forming a fluid tight fit.
  • the piston sleeve shaped element 5 surrounds the head B of piston 7 that enters in the high-pressure chamber 1 instead of the section A.
  • the inlet ports of high-pressure channel 8 are opened while the outlet ports of low-pressure channel 9 are closed by the sleeve-shaped element 5.
  • the piston moves down although high-pressure hydraulic fluid via channel 12 acts at the same time on the rim 7a of piston; infact, area A1 of rim 7a is smaller than area 7b of piston.
  • section B of the piston allows the flow of high-pressure fluid to the annular chamber 3 so that the fluid itself can press on circular surface 5a of the sleeve which, being larger than the circular surface 5b, causes a resultant thrust which moves up the sleeve until to close the ports of high-pressure channel 8 and to open the outlet ports to low-pressure channel 9. This causes the upward movement of piston 7 only because of the thrust of the hydraulic fluid on the annular surface 7a of the piston (Fig. 7).
  • Sleeve 5 moves down again to open the inlet ports of high-pressure channel 8 and to permit the repeating of a new cycle.
  • the sleeve 5 moves down to open the inlet ports of the fluid, the sleeve forces the fluid which is in the annular space formed under the surface 5a into little duct 15 and then via the annular recess formed by section 7d of piston 7, in the low-pressure duct 16.
  • the appliance is equipped with a pneumatic accumulator 11 a of nitrogen with a diaphragm 18 and with a sequence and velocity controlling valve 17, which exploiting the pressure decrease taking place on the beginning of recharging stroke for the higher hydraulic flow required by the recharge of accumulator 11a, at first closes and after throttles the outlet port of the low-pressure duct 10, in order to reduce the moving up velocity of the piston.
  • the piston impact is damped by the compressed fluid in the upper part of chamber 1 and being part A of piston diametrically greater than the B one to make as a shoulder, by rim 13 formed in the cylindrical chamber 2A and by the fluid contained in the same cylindrical chamber 2A.
  • the fluid-tight of inlet and outlet ports is, infact, made by the lateral outside surfaces 5e of the sleeve and 6b of flange 6 of the same sleeve.
  • the sleeve element 5 acts as a cylinder for piston 7, moving coaxially to it in the opposite direction, thus avoiding frontal impacts against piston 7 and consequently stresses in the sleeve element.
  • the fluid-tight seal of the inlet and outlet ports is made only by the sleeve like element5 and is independent from the piston wear.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fluid-Driven Valves (AREA)

Claims (4)

1. Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques, la machine hydraulique ayant un piston 7 comprimé directement par un fluide incompressible sous forte pression, par example de l'huile, ou un piston comprimé par un gaz, par example de l'azote sous forte pression pre-comprimé par le même piston (7) dans la course de recharge, la valve de contrôle incluant une chambre cylindrique (1) ayant une coulisse annualaire (1a) coaxiale par rapport au piston et un élément glissant (5) de forme cylindrique et tubulaire se déplaçant alternativement dans la chambre sus-mentionée pour ouvrir ou boucher l'orifice de sortie de fluide sous haute pression du canal sous haute pression et l'orifice d'entrée du fluide sous bas pression dans un canal de décharge, l'élément sus-mentioné de forme tubulaire (5) ayant un diamètre interne Ds et un rebord (6) d'un diamètre externe D6 pour limiter les glissements coaxiaux de la valve sus-mentionée dans la coulisse annulaire sus-mentionée, caractérisée en ce que l'orifice de sortie du canal sus-mentioné sous haute pression, est situé dans la chambre cylindrique sus-mentionée (1) et en ce que l'élément coulissant (5) entoure la superficie latérale du piston sur lequel agit la haute pression du fluide incompressible sus-mentioné, ou du gaz sus-mentioné au moyen du prolongement du même piston, le piston sus-mentioné ayant un diamètre D7 suffisant pour permettre un couplage de tenue de fluide avec la surface interne de l'élément tubulaire (5), l'inversion des glissements du sus-mentioné element coaxial par rapport au piston et à la chambre cylindrique pour boucher l'orifice de sortie du canal sus-mentionné sous haute pression et ouvrir l'orifice d'éntrée su canal sus-mentionée sous bas pression, ou vice-versa-pour ouvrir l'orifice de sortie du canal sous haute pression, survenant chaque fois que l'extrémité circulaire (7c) de la partie du piston activée par la pression, forme un couplage à tenue de fluide avec la surface interne de l'élément tubulaire glissant (5) sans le heurter, les glissements coaxiaux du piston et de l'élément (5) étant de sens opposé, l'élémenttubulaire sus-mentioné (5) faisant function de chemise de la chambre cylindrique (1) dans laquelle entre la partie du piston soumise à la pression.
2. Valve selon 1, caractérisée en ce que l'élément glissant tubulaire (5) est construit et monté de manière à ne pas être heurté par le piston, ses glissements étant provoqués uniquement par la pression du fluide incompressible agissant dans la chambre (1).
3. Valve selon 2, dans laquelle la chambre cylindrique sus-mentionée incluant la coulisse sus-mentionée (1a), l'orifice de sortie du canal sus-mentioné sous haute pression et l'orifice d'entrée du canal sous bas pression, est adjacent à une chambre annulaire (3) ayant un diamètre de D3, plus gran que le diamètre D1 de la chambre 1 pour appliquer directement la pression du fluide sur la surface de la couronne circulaire formée par le rebord 6 de l'élément tubulaire (5).
4. Valve selon 3, caractérisée en ce que le bouchement à tenue de fluide de l'orifice de sortie du canal sus-mentioné sous haute pression est provoquée par la surface externe de l'élément tubulaire (5) en couplage à tenue avec la surface de la chambre cylindrique sus-mentionée (1), c'est-à-dire de la surface latérale du même élément (5) sans interésser le piston.
EP82830014A 1982-01-22 1982-01-22 Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques Expired EP0085279B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8282830014T DE3271910D1 (en) 1982-01-22 1982-01-22 Directional control valve to obtain in a hydraulic appliance the alternative motion of a piston operating to charge and fire a tool, specially suitable for hydraulic hammers
EP82830014A EP0085279B1 (fr) 1982-01-22 1982-01-22 Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques
AT82830014T ATE20647T1 (de) 1982-01-22 1982-01-22 Steuerventil fuer den hin- und herbewegenden kolben einer hydraulischen schlagvorrichtung, insbesondere fuer einen hydraulischen hammer.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82830014A EP0085279B1 (fr) 1982-01-22 1982-01-22 Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques

Publications (2)

Publication Number Publication Date
EP0085279A1 EP0085279A1 (fr) 1983-08-10
EP0085279B1 true EP0085279B1 (fr) 1986-07-09

Family

ID=8190099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82830014A Expired EP0085279B1 (fr) 1982-01-22 1982-01-22 Valve pour commander le mouvement alternatif d'un piston de machine hydraulique à percussion, en particulier pour marteaux hydrauliques

Country Status (3)

Country Link
EP (1) EP0085279B1 (fr)
AT (1) ATE20647T1 (fr)
DE (1) DE3271910D1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618092B1 (fr) * 1987-07-17 1989-11-10 Montabert Ets Distributeur hydraulique pour appareil a percussions mu par un fluide incompressible sous pression
ATE154774T1 (de) * 1989-10-18 1997-07-15 Mauro Vitulano Verfahren zum automatischen anpassen der funktionsparameter eines schlagapparates
SE9100092D0 (sv) * 1991-01-11 1991-01-11 Aquapact Ab Hydraulisk saenkborrmaskin
FR2676953B1 (fr) * 1991-05-30 1993-08-20 Montabert Ets Appareil hydraulique a percussions.
JP3378029B2 (ja) * 1991-08-08 2003-02-17 丸善工業株式会社 油圧ブレーカ
FI104959B (fi) 1994-06-23 2000-05-15 Sandvik Tamrock Oy Hydraulinen iskuvasara
FI107891B (fi) * 1998-03-30 2001-10-31 Sandvik Tamrock Oy Painenestekäyttöinen iskulaite
IT1312140B1 (it) * 1999-06-22 2002-04-09 Priver Ind Srl Macchina oleodinamica a percussione di concezione innovativafunzionante a pressione idraulica costante.
CN107524419B (zh) * 2017-09-22 2023-07-07 中国石油天然气集团有限公司 液压震击器
US11027403B2 (en) * 2018-06-18 2021-06-08 Caterpillar Inc. Hydraulic hammer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1431835A (fr) * 1965-01-28 1966-03-18 Montabert Ets Appareil à percussions
US3766830A (en) * 1971-03-24 1973-10-23 Montabert Roger Percussion apparatus
FI50307C (fi) * 1974-04-20 1976-02-10 Xandor Ag Hydraulisesti käytetty iskulaite
ZA763554B (en) * 1976-05-03 1977-09-28 Hydroacoustic Inc Impact tools
US4231434A (en) * 1978-02-21 1980-11-04 Justus Edgar J Hydraulic impact device

Also Published As

Publication number Publication date
ATE20647T1 (de) 1986-07-15
DE3271910D1 (en) 1986-08-14
EP0085279A1 (fr) 1983-08-10

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