EP0522344A2 - Hydraulischer Schlaghammer - Google Patents

Hydraulischer Schlaghammer Download PDF

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Publication number
EP0522344A2
EP0522344A2 EP92110512A EP92110512A EP0522344A2 EP 0522344 A2 EP0522344 A2 EP 0522344A2 EP 92110512 A EP92110512 A EP 92110512A EP 92110512 A EP92110512 A EP 92110512A EP 0522344 A2 EP0522344 A2 EP 0522344A2
Authority
EP
European Patent Office
Prior art keywords
impact
guiding
piston
impact hammer
hammer
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
Application number
EP92110512A
Other languages
English (en)
French (fr)
Other versions
EP0522344A3 (en
EP0522344B1 (de
Inventor
Timo Sippus
Seppo Jurvanen
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.)
Tamrock Oy
Original Assignee
Bretec Oy
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 Bretec Oy filed Critical Bretec Oy
Publication of EP0522344A2 publication Critical patent/EP0522344A2/de
Publication of EP0522344A3 publication Critical patent/EP0522344A3/en
Application granted granted Critical
Publication of EP0522344B1 publication Critical patent/EP0522344B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force

Definitions

  • the present invention relates to a hydraulic impact hammer, particularly to the frame structure of an impact hammer, where the housing guiding the piston of the impact hammer is separated from the housing surrounding the impact member, so that the tension wave reflected from the impact member is prevented from proceeding to other parts of the hammer.
  • Impact hammers are divided, on the basis of their operating power for instance, to two groups, e.g. pneumatic and hydraulic impact hammers.
  • the power of pneumatic impact hammers is essentially lower than that of hydraulic impact hammers.
  • pneumatic impact hammers are normally manually operated, whereas hydraulic impact hammers are generally used in connection with various machines.
  • a tension wave is reflected to other parts of the device with pneumatic impact hammers as well.
  • the DE patent 805,268 suggests an arrangement for reducing the effect of this tension wave.
  • the guide ring of the impact member is made of elastic material.
  • the collar supporting the impact member is made of attenuating material. A similar structure is described in the DE patent 805,748.
  • the housing elements of the impact hammer including a control valve system and valve housings of hydraulic fluid, a piston and a member guiding the piston, various sealing rings and a member guiding the impact member, are permanently interconnected with either long binding screws or with several shorter bolts.
  • the obtained structure is further suspended by means of attenuating elements and arranged inside a casing provided around the impact hammer.
  • the joining of the housing elements to each other causes various heavy strains on the whole impact hammer.
  • the masses to be attenuated are large, which charges heavy loads on the various housing elements, and particularly to the joining members of the housing elements.
  • the junction surfaces of the impact hammer slide with respect to each other and are subjected to wearing.
  • the tension wave reflected from the impact member hits the housing structure, which causes extra strains to other housing elements, as well as vibration and noise.
  • the use of binding screws as the coupling members of the housing elements also causes transformations in the said elements and makes the maintenance of the impact hammer difficult, because the interconnected elements must be taken apart.
  • the object of the present invention is to achieve a new housing structure for a hydraulic impact hammer, which is more secure in operation and simpler in structure, and wherein the member guiding the piston of the impact hammer is separated from the member guiding the impact member of the impact hammer, and where these both are advantageously separately attenuated with respect to the impact hammer casing.
  • the member guiding the piston of the impact hammer and the member guiding the impact member are both separately suspended by means of at least one attenuating element, so that there is no essential metallic contact between these two housing elements.
  • An immediate contact between the piston and the impact member is only created at the moment of striking, when the piston hits the impact member.
  • the attenuating elements allow the housing elements of the impact hammer to move within the protective casing both axially and radially, depending on the load.
  • the attenuating elements guiding the impact member receive the forces caused by the actuator of the impact hammer, the forces reflected from the tension waves of the impact member and the forces created when the impact member hits, by intermediation of the holding pins, the member guiding the impact member in a so-called empty stroke, when there is no material to be crushed under the impact hammer.
  • the attenuating elements of the member guiding the piston receive for instance the forces created while accelerating the piston of the impact hammer.
  • the attenuating elements of both the member guiding the piston and of the member guiding the impact member are advantageously installed so that the attenuating elements centralize the housing elements with respect to each other when there is no external load.
  • the housing elements Under external load, the housing elements can be arranged radially with respect to each other, if necessary by means of a separate guiding surface.
  • the transmission of vibration and noise to the casing surrounding the impact member of the invention is advantageously prevented by using attenuating elements, which arrangement leads to a simple and effective attenuation of vibration and noise.
  • the employed attenuation elements can be made of solid, gaseous or liquid materials.
  • the attenuating elements are advantageously made of some elastic material, such as rubber, plastic, polyurethane or other similar material. In that case the attenuating elements advantageously contain straight or curved surfaces.
  • the attenuating elements of the invention can also be for instance spring-like, in which case they are advantageously made of metal. Further, the attenuating effect of the attenuating elements can advantageously be created for example by means of levitation caused by an air cushion or a magnet. In order to create the attenuating effect, hydraulic fluid can also be used.
  • the attenuating elements of the member guiding the piston and of the member guiding the impact member can be either of a similar type, in which case the attenuating effect is obtained in a similar fashion, or of two different types, in which case different sources of materials are used for creating the attenuating effect.
  • the attenuating elements are, however, so installed, that there are no wearing parts located in between the protective casing of the impact hammer of the invention and the housing elements of the impact hammer.
  • the access of tension waves reflected from the impact member, and the access of the forces caused by bending the impact member, to the piston-guiding part and to the valve system guiding the hydraulic fluid is advantageously prevented.
  • the valve system controlling the hydraulic fluid which system is needed for operating the piston, is subjected to lower external forces, so that the valve system can be made simpler and more reliable.
  • the control and bearings of the piston can be measured for a smaller load. This simplifies the structure, and the risk of seizure in the piston and the cylinder is reduced.
  • the member 1 guiding the piston and the member 2 guiding the impact member are separated from each other by the interval 3.
  • the connection between the members 1 and 2 is achieved so that member 1 is, by means of at least one elastic attenuating element 4, and member 2 is by means of at least one elastic attenuating element 5, centralized and supported inside the protective casing 6.
  • the piston 7 hits the top end of the impact member 8, advantageously owing to the centralizing achieved by means of the atteanuating elements 4 and 5.
  • the downwardly motion of the impact member 8 is restricted by means of holding pins 9.
  • FIG 3 in between the piston-guiding member 11 and the member 12 guiding the impact member, there is installed an attenuating element 14 of the connecting surface 13, by means of which element the members 11 and 12 are radially guided also during charge, i.e. during the impact.
  • Figure 3 also contains reference numbers for the interval 15 in between the members 11 and 12, for the attenuating element 16 guiding the piston, for the attenuating element 17 of the member 12 guiding the impact member, for a common protective casing 18 of members 11 and 12, for the piston 19, for the impact member 20 and for the holding pin 21 of the impact member.
  • the parts illustrated in figure 3 are operated in similar fashion as the respective parts of figures 1 and 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
EP19920110512 1991-07-09 1992-06-22 Hydraulischer Schlaghammer Expired - Lifetime EP0522344B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI913311 1991-07-09
FI913311A FI91944C (fi) 1991-07-09 1991-07-09 Hydraulinen iskuvasara

Publications (3)

Publication Number Publication Date
EP0522344A2 true EP0522344A2 (de) 1993-01-13
EP0522344A3 EP0522344A3 (en) 1993-07-28
EP0522344B1 EP0522344B1 (de) 1997-08-27

Family

ID=8532868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920110512 Expired - Lifetime EP0522344B1 (de) 1991-07-09 1992-06-22 Hydraulischer Schlaghammer

Country Status (5)

Country Link
EP (1) EP0522344B1 (de)
JP (1) JPH0777709B2 (de)
DE (1) DE69221788T2 (de)
ES (1) ES2104773T3 (de)
FI (1) FI91944C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020267A1 (de) * 1993-03-08 1994-09-15 Udo Winter Presslufthammer
US5878823A (en) * 1994-11-17 1999-03-09 Atlas Copco Berema Ab Hydraulic breaking hammer
WO2008069685A1 (en) * 2006-12-07 2008-06-12 Rocktec Limited Breaking machine shock absorbing system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5845492B2 (ja) * 2012-12-03 2016-01-20 アピュアン株式会社 作業工具

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE801565C (de) * 1948-10-02 1951-01-11 Wilhelm Dipl-Ing Schmitt Stossdaempfer fuer Drucklufthaemmer
DE805268C (de) * 1948-10-02 1951-05-10 Hauhinco Maschf Presslufthammer
DE805748C (de) * 1948-10-02 1951-05-28 Hauhinco Maschf Schlagwerkzeug, insbesondere Presslufthammer
US3797586A (en) * 1971-12-20 1974-03-19 Bell Telephone Labor Inc Mole with decoupled nose and body
FR2209311A5 (de) * 1972-12-05 1974-06-28 Maco Meudon Sa
FR2303645A1 (fr) * 1975-03-13 1976-10-08 Duss Maschf Marteau manoeuvrable a la main dont l'outil recoit les chocs d'un piston se deplacant librement
US4074777A (en) * 1974-08-08 1978-02-21 Atlas Copco Aktiebolag Pneumatic impact tool
EP0080446A2 (de) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Schlagwerkzeug und Steuerverfahren dafür
FR2647870A1 (fr) * 1989-06-06 1990-12-07 Eimco Secoma Appareil de percussion hydraulique avec dispositif d'amortissement des ondes de choc en retour
US5018792A (en) * 1990-05-25 1991-05-28 Caterpillar Inc. Impact ripper apparatus with linear reciprocating ram
WO1991012934A1 (en) * 1990-02-23 1991-09-05 Tamrock Oy An arrangement for an axial bearing in a drilling machine
EP0471649A1 (de) * 1990-08-16 1992-02-19 SIG Schweizerische Industrie-Gesellschaft Durch ein Druckmedium betriebener Hammer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184993U (de) * 1986-05-19 1987-11-25
JPH04124283A (ja) * 1990-09-17 1992-04-24 Sumitomo Electric Ind Ltd 窒化ほう素膜のコーティング方法

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE801565C (de) * 1948-10-02 1951-01-11 Wilhelm Dipl-Ing Schmitt Stossdaempfer fuer Drucklufthaemmer
DE805268C (de) * 1948-10-02 1951-05-10 Hauhinco Maschf Presslufthammer
DE805748C (de) * 1948-10-02 1951-05-28 Hauhinco Maschf Schlagwerkzeug, insbesondere Presslufthammer
US3797586A (en) * 1971-12-20 1974-03-19 Bell Telephone Labor Inc Mole with decoupled nose and body
FR2209311A5 (de) * 1972-12-05 1974-06-28 Maco Meudon Sa
US4074777A (en) * 1974-08-08 1978-02-21 Atlas Copco Aktiebolag Pneumatic impact tool
FR2303645A1 (fr) * 1975-03-13 1976-10-08 Duss Maschf Marteau manoeuvrable a la main dont l'outil recoit les chocs d'un piston se deplacant librement
EP0080446A2 (de) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Schlagwerkzeug und Steuerverfahren dafür
FR2647870A1 (fr) * 1989-06-06 1990-12-07 Eimco Secoma Appareil de percussion hydraulique avec dispositif d'amortissement des ondes de choc en retour
WO1991012934A1 (en) * 1990-02-23 1991-09-05 Tamrock Oy An arrangement for an axial bearing in a drilling machine
US5018792A (en) * 1990-05-25 1991-05-28 Caterpillar Inc. Impact ripper apparatus with linear reciprocating ram
EP0471649A1 (de) * 1990-08-16 1992-02-19 SIG Schweizerische Industrie-Gesellschaft Durch ein Druckmedium betriebener Hammer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994020267A1 (de) * 1993-03-08 1994-09-15 Udo Winter Presslufthammer
US5797463A (en) * 1993-03-08 1998-08-25 Winter; Udo Pneumatic hammer
US5878823A (en) * 1994-11-17 1999-03-09 Atlas Copco Berema Ab Hydraulic breaking hammer
WO2008069685A1 (en) * 2006-12-07 2008-06-12 Rocktec Limited Breaking machine shock absorbing system
CN101600543B (zh) * 2006-12-07 2013-11-13 终结者Ip股份有限公司 击破机器冲击吸收***

Also Published As

Publication number Publication date
EP0522344A3 (en) 1993-07-28
FI91944C (fi) 1994-09-12
EP0522344B1 (de) 1997-08-27
FI91944B (fi) 1994-05-31
JPH05185380A (ja) 1993-07-27
FI913311A (fi) 1993-01-10
DE69221788D1 (de) 1997-10-02
DE69221788T2 (de) 1998-01-15
FI913311A0 (fi) 1991-07-09
ES2104773T3 (es) 1997-10-16
JPH0777709B2 (ja) 1995-08-23

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