EP0330687A1 - Pneumatischer linearvibrator - Google Patents
Pneumatischer linearvibratorInfo
- Publication number
- EP0330687A1 EP0330687A1 EP88907143A EP88907143A EP0330687A1 EP 0330687 A1 EP0330687 A1 EP 0330687A1 EP 88907143 A EP88907143 A EP 88907143A EP 88907143 A EP88907143 A EP 88907143A EP 0330687 A1 EP0330687 A1 EP 0330687A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pressure medium
- linear vibrator
- guide tube
- outlet openings
- 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
-
- 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
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
- B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
Definitions
- the present invention relates to a pneumatically tables Li nearvi Brator with a limited by sealing at least on one side, releasable closure members piston guide, a piston, a visual al Id 'ämpferrohr and means for the supply and discharge of a gas or vaporous pressure medium, the relative movement between the guide with the end parts and the piston being effected by self-regulating, alternating supply of the pressure medium to a working volume formed on one end face of the piston.
- a generic air pressure vibrator with a reciprocating piston is known from DE-OS 30 31 349.
- This compressed air vibrator has a housing made from a light metal profile piece, which has four cross-shaped ribs.
- the compressed air supply is in two ribs. Compressed air discharge arranged, the other two ribs are used to hold fasteners.
- This vibrator has proven itself well in practice, but has the disadvantage that it has a relatively complicated construction and is therefore correspondingly expensive.
- the inventors have set themselves the task of creating a linear vibrator with relative piston movement and thereby controlled alternating supply of the pressure medium, which is simple to manufacture, can be used without maintenance and can be used universally.
- a piston with a longitudinal axial bore which has an annular groove in the area of the ends or on both sides adjacent to the longitudinal center of the piston, which is arranged over at least two axially symmetrical seals and is sealed off from the longitudinal axial bore of the piston, Channels extending in the axial direction are connected to an end face of the piston, this end face being the adjacent ring groove in the case of ring grooves arranged in the area of the piston ends and distant in the case of ring grooves arranged in the area of the piston longitudinal center
- a guide tube for the supply of the pressure medium which acts as a piston guide and which, in accordance with the annular grooves in the longitudinal axial bore of the piston, is arranged in the radial direction and passes axially through the sealing parts and the longitudinal axial bore of the piston and is sealed axially al sym etri see outlet openings for the pressure medium.
- the captivatingly simple construction of the linear vibrator according to the invention permits a slim, elongated shape, which unfolds its advantages in particular when the vibrator is used, for example, for sieves, transport channels, compacting systems or for driving tools.
- Air is expediently used as the pressure medium, but exhaust gases or steam can also be used, for example.
- the external dimensions of the linear vibrator can be varied as required depending on the intended use.
- the piston can, for example, have a length of 10-20 cm and a diameter of 1.5-5 cm, the longitudinal-axial bore having a clear width of 25-50% of the piston outside diameter.
- the appropriately 1-3 mm deep ring grooves can, for example, be 1-3 cm from the end faces of the piston or from its longitudinal center.
- the stroke of the piston is only a few centimeters.
- the frequency of the reciprocating piston is primarily dependent on the pressure of the medium supplied, the stroke and weight of the piston and the coefficient of friction of the sliding surfaces.
- the linear vibrator is expediently fed directly from the compressed air network, which usually has a pressure of 6-8 bar.
- the frequency of the pneumatic linear vibrator with a reciprocating piston can be increased by removing material axially from the piston, but the control of the alternating supply of compressed air to the working volumes must not be disturbed.
- the pneumatic linear vibrator is driven by means of an alternating supply of the pressure medium, preferably via at least one working volume, which is formed by a cylindrical recess in the end part in question, which is formed as a guide tube for the pressure medium and a front face of the piston / which piston rests with its inner and outer surface.
- the working volume is compressed starting from normal pressure until the annular groove in the piston reaches the corresponding outlet openings in the guide tube.
- the pressure medium flowing out at high pressure initiates the movement, which continues until, on the one hand, the piston is out of the cylindrical recess in the end part and the pressure medium can escape and, on the other hand, pressure medium can flow in again on the opposite side of the piston.
- the pneumatic linear vibrator can be manufactured in two basic types:
- the guide tube and / or a closing part can be attached to a base by known mechanical means or can be inserted into a mass to be compacted as an immersion vibrator. In this case, the pistons are moved back and forth during operation.
- the piston is mechanical with known means Fastening equipped, longitudinal slots corresponding to the linear movement being cut out from the silencer tube. In this case, which is less common in practice, the guide tube is moved back and forth with the end parts during operation.
- Pneumatic linear vibrators operating horizontally or almost horizontally are expediently equipped with a starting aid.
- the piston With a spring or with the help of a part of the pressure medium, the piston can change its position in relation to the guide tube so that an annular groove in the piston and outlet openings in the guide tube lie one above the other and the vibration process is triggered.
- the vibrator can work on one side with a return spring instead of with two working volumes arranged on the end face of the piston.
- the spring compressed after the introduction of the pressure medium on the other end face of the piston pushes the piston back after the pressure medium has been expelled from the working volume until the pressure medium flowing out triggers the next working cycle.
- the Seh al Idä pferrohr which is preferably coaxially arranged at a distance from the piston, collects the ejected pressure medium and expediently discharges it laterally.
- a cooling labyrinth known per se can be arranged in the silencer.
- the silencer tube of the linear vibrator is also its protective housing.
- the mechanically easily processable materials aluminum and brass are preferably used at least for the piston and the guide tube.
- the silencer tube can consist of one of these materials as well as of another suitable material, for example plastic or ceramic. In particularly stored cases, however, instead of the materials mentioned, at least partially Steel are used.
- the sliding surfaces are preferably coated with a known abrasion-reducing, wear-resistant inorganic or organic material.
- the end faces of the scarf 1 damper tube are closed, connection ports being provided for the supply of the pressure medium and usually also for its removal.
- the muffler pipe can be provided with a known corrosion and / or erosion-resistant coating, if it does not consist of a corresponding material.
- the piston must hit the end part on the side facing away from the compressed air supply.
- the inner and the outer end face of the end part acted upon by the piston must consist of a known wear and impact resistant material, like the corresponding end face of the piston.
- outlet bores are preferably arranged in the outer wall of the sealing end part in question, directly next to the impact surface. If no other known mechanical or pneumatic means are provided for returning the piston, and all air escapes on the striking side, the piston is returned with a starting aid.
- the outer side of the end cylinder depending on the type of application, is flat or designed as a cutting or pointed chisel. Use as a riveting hammer has proven to be particularly advantageous.
- FIG. 1 shows a longitudinal section through a linear vibrator with two identical, cylindrical-shaped end parts and a pneumatic starting aid
- Fig. 2 shows a cross section along the line II - II
- FIG. 3 shows a longitudinal section " through a linear vibrator with a mounting flange and a spiral spring as a starting aid
- FIG. 5 shows a cross section along the line V - V in FIG. 4,
- FIG. 6 shows a cross section along the line VI-VI in FIG. 4,
- Fig. 7 is a cross section along the line VII - VII in Fig. 4, and
- uft-Li nearvi brator essentially consists of a piston 10, cylinder-shaped end parts 14, 16, a guide tube 18 which also serves to supply the pressure medium, in particular compressed air, and a silencer tube 52.
- the guide tube can 18 are connected to the compressed air on both sides. In practical use, however, one side is expediently closed.
- the longitudinal axial bore 22 of the piston 10 has a reduction in cross section 24 in the direction of the compressed air supply, the diameter Dj being reduced to D2 in one step.
- Both the larger and the smaller bore each have an annular groove 26 in the region of the end faces of the piston 10, of which - as shown in FIG. 2 in section - four channels 27 each parallel to the longitudinal axis A of the piston 10 to its neighboring one Lead end face, these channels are recessed in the longitudinal direction from the jacket of an inserted sleeve 25 and are thus closed against the longitudinal axial bore 22.
- the length of the piston is denoted by 1, the distance between the ring grooves by n.
- the longitudinal axial bore 22 of the piston 10 slides to form an air cushion on the guide tube 18, which in turn has a constriction 28 of the outer diameter O ZU D2 corresponding to the reduction in cross section 24.
- a constriction 28 of the outer diameter O ZU D2 corresponding to the reduction in cross section 24.
- outlet openings 32 pass through the wall of the guide tube 18.
- the openings each have a clear width of 3-4 mm.
- projecting guide tube 18 serves as a fastening socket for a compressed air supply hose (not shown). This is expediently secured with a clamp or the like.
- the end part 16 carries a closure cap 50 for the guide tube 18.
- the cap is equipped in such a way that it also serves to fasten the compressed air linear vibrator on a device to be vibrated. For this purpose, it can have an external thread, not shown.
- the working volumes V ⁇ and V2 are formed by cylindrical indentations in the end parts 14, 16, the guide tube 18 and the relevant end face of the piston 10.
- the end faces of the piston 10 do not strike the inner end faces of the end parts 14, 16, because after the pressure equalization, the compressed residual air forms a pressure cushion.
- end part 16 is designed as a fastening flange with a mounting surface 54 and screw holes 56. Both end parts 14, 16 have a sealing lip 57 which is ring-shaped in cross-section and has a sealing surface 58, on which the lateral inner wall of a pot-shaped recess in the piston 10 slides on the end faces.
- the end part 14 is provided with an end cover 60, through which exhaust air bores 62 lead for the compressed air expelled from the working volume V] _, V2.
- the damper tube 52 which is coaxial with respect to the axis A, is designed to be sealing, and is placed on the end face of the two end parts 14, 16.
- the piston has two annular grooves 26 arranged adjacent to the end faces at a distance n.
- the channels 27 are an annular groove with bores connecting the adjacent pot-shaped recess in the end face and running in the axial direction.
- the external threads 64 allow installation on both sides if required.
- a closure cover 76 is screwed onto the guide tube 18 on the exhaust air side. Via an O-ring, the cover 76 secured with a lock nut 80 presses a porous sound-absorbing element 82, which is ring-shaped in cross-section, into a correspondingly shaped groove of the cover 60. Between the cover 60 and the cover 76, an annular slot 84 remains open. through which the exhaust air can escape after passing through the sound damping element 82.
- the closure cover 76 is therefore the housing for the sound-absorbing element 82 and at the same time serves to fine-tune the amount of exhaust air, the slot 84 being closed or opened and the inserted O-ring 78 being more or less compressed.
- the width of the exhaust air jet 84 affects the noise generated by the vibrator and its frequency.
- the guide tube 18, which is closed on the other side can be dig off with the mounting surface 54 or slightly countersunk, thus making it easier to apply to a flat lower surface.
- FIG. 3 The operating principle of FIG. 3 corresponds to that of FIGS. 1 and 2, with the exception of the starting aid mentioned.
- the linear vibrator shown in FIGS. 4-7 in its essential functional parts has a guide tube 18 with four axially arranged symmetrically arranged outlet openings 32.
- the piston 10 corresponding in its outer contours in FIG. 3 has two rings arranged adjacent to the longitudinal center grooves 26. These are connected via radial branch channels 86 to three channels 27 running in axial direction, which lead to the distal end of the piston.
- the outlet openings 32 always move back into the area between the two ring grooves 26 when they lie over an annular groove 26 and a working volume V] _ or V2 pressure medium is supplied.
- a jump start is not shown for the sake of simplicity, it can be done in the manner shown above.
- the guide tube 18 is only tubular on the inlet side of the pressure medium by drilling out a cylindrical rod.
- the piston 10 is designed on this side in accordance with FIG. 3.
- a return spring 88 is arranged between the end face of the piston 10 and the end part 16.
- the return spring is compressed when the openings 32 and the annular groove 26 one above the other! and the pressure medium exits into the working volume V via the channels designed as a bore.
- the spring force of the return spring 88 and the pressure of the medium supplied must be coordinated. If the annular groove 26 and the outlet openings 32 do not lie one above the other in the resting position, a starting aid of the type mentioned is used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Percussive Tools And Related Accessories (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88907143T ATE70336T1 (de) | 1987-09-09 | 1988-08-23 | Pneumatischer linearvibrator. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH349287 | 1987-09-09 | ||
CH3492/87 | 1987-09-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0330687A1 true EP0330687A1 (de) | 1989-09-06 |
EP0330687B1 EP0330687B1 (de) | 1991-12-11 |
Family
ID=4257166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88907143A Expired - Lifetime EP0330687B1 (de) | 1987-09-09 | 1988-08-23 | Pneumatischer linearvibrator |
Country Status (5)
Country | Link |
---|---|
US (1) | US5070769A (de) |
EP (1) | EP0330687B1 (de) |
AT (1) | ATE70336T1 (de) |
DE (1) | DE3866865D1 (de) |
WO (1) | WO1989002514A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19652707A1 (de) * | 1996-12-18 | 1998-06-25 | Netter Gmbh | Pneumatischer Klopfer |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPM597094A0 (en) * | 1994-05-31 | 1994-06-23 | Hansen, A.M. | Dynamic linear mass accelerator |
US7225725B2 (en) * | 2005-05-17 | 2007-06-05 | Trestain Dennis A | Bi-directional pneumatic motor |
US9499085B2 (en) * | 2013-06-25 | 2016-11-22 | Martin Engineering Company | Vibratory apparatus |
KR101546056B1 (ko) * | 2013-08-09 | 2015-08-20 | 이경운 | 진동발생장치 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL35760C (de) * | ||||
FR760428A (fr) * | 1932-11-24 | 1934-02-22 | Cie Parisienne Outil Air Compr | Vibrateur |
BE515262A (de) * | 1951-11-03 | |||
US2748750A (en) * | 1953-01-13 | 1956-06-05 | Armour Res Found | Vibrationless pneumatic impact tool |
US2917025A (en) * | 1958-06-03 | 1959-12-15 | Richard O Dulaney | Pneumatic drill hammer |
US2887989A (en) * | 1958-07-03 | 1959-05-26 | Richard O Dulaney | Pneumatic rotary drill hammer |
US3045768A (en) * | 1958-07-14 | 1962-07-24 | Gardner Denver Co | Fluid operated percussion drill |
US3736843A (en) * | 1971-05-20 | 1973-06-05 | Applied Power Ind Inc | Vibrator apparatus |
US4026193A (en) * | 1974-09-19 | 1977-05-31 | Raymond International Inc. | Hydraulically driven hammer system |
SE406875B (sv) * | 1976-03-15 | 1979-03-05 | Nilsson Goran Alfred | Avvribreringsanordning vid med tryckmediedriven, fram- och atergaende slagmekanism forsedda verktyg |
SU655824A1 (ru) * | 1976-07-07 | 1979-04-05 | Институт Горного Дела Со Ан Ссср | Пневматическое ударное устройство дл бурени скважин |
US4303002A (en) * | 1978-01-31 | 1981-12-01 | Maslakov Petr A | Hand-operated pneumatic impact machine |
US4351225A (en) * | 1980-01-17 | 1982-09-28 | The Aro Corporation | Vibration attenuation construction for an impact air tool |
-
1988
- 1988-08-23 WO PCT/CH1988/000143 patent/WO1989002514A1/de active IP Right Grant
- 1988-08-23 AT AT88907143T patent/ATE70336T1/de not_active IP Right Cessation
- 1988-08-23 DE DE8888907143T patent/DE3866865D1/de not_active Expired - Lifetime
- 1988-08-23 US US07/360,907 patent/US5070769A/en not_active Expired - Fee Related
- 1988-08-23 EP EP88907143A patent/EP0330687B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8902514A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19652707A1 (de) * | 1996-12-18 | 1998-06-25 | Netter Gmbh | Pneumatischer Klopfer |
DE19652707C2 (de) * | 1996-12-18 | 2000-07-20 | Netter Gmbh | Pneumatischer Klopfer |
Also Published As
Publication number | Publication date |
---|---|
DE3866865D1 (de) | 1992-01-23 |
US5070769A (en) | 1991-12-10 |
WO1989002514A1 (en) | 1989-03-23 |
EP0330687B1 (de) | 1991-12-11 |
ATE70336T1 (de) | 1991-12-15 |
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