EP1442999B1 - Pneumatic knocker - Google Patents

Pneumatic knocker Download PDF

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Publication number
EP1442999B1
EP1442999B1 EP04405024A EP04405024A EP1442999B1 EP 1442999 B1 EP1442999 B1 EP 1442999B1 EP 04405024 A EP04405024 A EP 04405024A EP 04405024 A EP04405024 A EP 04405024A EP 1442999 B1 EP1442999 B1 EP 1442999B1
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EP
European Patent Office
Prior art keywords
piston
chamber
percussion piston
air
housing
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Expired - Lifetime
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EP04405024A
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German (de)
French (fr)
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EP1442999A1 (en
Inventor
Thomas Kopp
Martin Deller
Werner Lenherr
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Findeva AG
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Findeva AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/66—Large containers characterised by means facilitating filling or emptying preventing bridge formation using vibrating or knocking devices
    • 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

Abstract

The pneumatic impact device (1) has an impact piston (5), displaced axially within a housing (2), in the direction of its upper wall (3), against the force of a return spring (8), via compressed air, with rapid venting of the chamber (7) below the impact piston upon reaching a given stroke via a control element (4) within the impact piston, which opens an air channel (16). the latter is closed by movement of the impact piston into its lower position.

Description

Die Erfindung betrifft einen pneumatisch arbeitenden Klopfer, beispielsweise für das Abklopfen von Behälterwandungen, mit einem Gehäuse, in dem ein Schlagkolben gelagert ist, der mit Druckluft gegen die rückwirkende Kraft einer Feder gegen eine Oberwand des Gehäuses bewegbar ist, welche Feder in einer oberen Kammer angeordnet ist, die eine Entlüftungsbohrung besitzt und mit wenigstens einem Luftkanal, durch den eine unter dem Schlagkolben angeordnete untere Kammer entlüftet wird, wenn der Schlagkolben einen vorbestimmten Hub ausgeführt hat.The invention relates to a pneumatically operated knocker, for example, for the tapping of container walls, with a housing in which a percussion piston is mounted, which is movable with compressed air against the retroactive force of a spring against an upper wall of the housing, which spring arranged in an upper chamber is, which has a vent hole and with at least one air passage through which a arranged below the percussion piston lower chamber is vented when the percussion piston has performed a predetermined stroke.

Pneumatisch arbeitende Klopfer der genannten Art sind seit langem bekannt. Beispielsweise offenbart die DE 25 49 551 A einen pneumatisch arbeitenden Klopfer, der insbesondere für das Abklopfen von staubförmigem Material von Behälterwandungen vorgesehen ist. Dieser weist ein Zylinderrohr auf, in dem ein Schlagkolben gelagert ist. Das Zylinderrohr ist an einem Ende mit einem Deckel und an einem anderen Ende mit einer Prallplatte verschlossen. Der Schlagkolben wird gegen die rückwirkende Kraft der Feder angehoben und nach der Umstellung eines Ventils gegen die Prallplatte bewegt.Pneumatically operating knockers of the type mentioned have long been known. For example, DE 25 49 551 A discloses a pneumatically operated knocker, which is provided in particular for the tapping of dust-like material from container walls. This has a cylinder tube in which a percussion piston is mounted. The cylinder tube is closed at one end with a lid and at another end with a baffle plate. The percussion piston is lifted against the retroactive force of the spring and moved after the conversion of a valve against the baffle plate.

Ein weiterer pneumatischer Klopfer dieser Art ist aus der EP 0 345 484 bekannt geworden. Bei diesem ist in einer Gehäuseseitenwand eine Steuerbohrung vorgesehen. Diese Steuerbohrung ist über eine Steuerleitung mit einem 3/2-Wegeluftventil in Verbindung. Dieses Ventil ist zudem mit einem Anschlussloch in der Ventilwandung verbunden. Damit soll eine automatische Taktsteuerung der Kolbenschläge ohne mechanische, mit dem Kolben zusammenwirkende Teile möglich sein. Nachteilig ist bei diesem Klopfer jedoch die vergleichsweise aufwändige Herstellung und Montage.Another pneumatic knocker of this type has become known from EP 0 345 484. In this case, a control bore is provided in a housing side wall. This control bore communicates via a control line with a 3/2-way air valve. This valve is also connected to a connection hole in the valve wall. This should be possible without mechanical, cooperating with the piston parts an automatic stroke control of the piston strokes. A disadvantage of this knocker, however, the relatively complex production and assembly.

Die Erfinder haben sich die Aufgabe gestellt, einen pneumatisch arbeitenden Klopfer der genannten Gattung zu schaffen, der kostengünstiger herstellbar und einfacher montierbar ist. Der Klopfer soll trotzdem funktionssicher sein.The inventors have set themselves the task of creating a pneumatically operated knocker of the type mentioned, which is less expensive to produce and easier to install. The knocker should still be reliable.

Die Aufgabe ist bei einem pneumatisch arbeitenden Klopfer der genannten Gattung dadurch gelöst, dass im Schlagkolben ein Steuerelement angeordnet ist, das zur Schnellentlüftung der unteren Kammer bei einem vorbestimmten Hub des Schlagkolbens den genannten Luftkanal freigibt und diesen bei Rückführung des Schlagkolbens in die untere Schlagposition wieder schliesst, wobei der Luftkanal im Schlagkolben angeordnet ist.The object is achieved with a pneumatically operated knocker of the type mentioned in that a control element is arranged in the percussion piston, which releases the said air duct for quick exhaust of the lower chamber at a predetermined stroke of the percussion piston and this closes when returning the percussion piston in the lower stroke position again , wherein the air channel is arranged in the percussion piston.

Beim erfindungsgemässen Klopfer sind insbesondere ein 3/2-Wegeluftventil und entsprechende Steuerleitungen nicht erforderlich. Die Umsteuerung erfolgt mit dem im Schlagkolben angeordneten Steuerelement, was eine einfache und insbesondere sehr kompakte Konstruktion ermöglicht. Eine besonders betriebssichere und dauerhafte Ausführung ist dann gewährleistet, wenn das Steuerelement als Steuerkolben ausgebildet ist.In the knocker according to the invention, in particular a 3/2-way air valve and corresponding control lines are not required. The reversal takes place with the arranged in the percussion piston control, which allows a simple and very compact design. A particularly reliable and durable design is ensured when the control is designed as a control piston.

Eine besonders einfache und kompakte Ausführung ergibt sich dann, wenn gemäss einer Weiterbildung der Erfindung der Luftkanal zur Schnellentlüftung der unteren Kammer im Kolben angeordnet ist. Auf eine aussenseitig angeordnete Luftleitung kann in diesem Fall verzichtet werden.A particularly simple and compact design results when, according to an embodiment of the invention, the air duct for quick exhaust of the lower chamber is arranged in the piston. On the outside arranged air line can be dispensed with in this case.

Nach einer Weiterbildung der Erfindung ist vorgesehen, dass über dem Steuerkolben ein Druckraum angeordnet ist und der Steuerkolben in eine Schliessstellung bringbar ist, in welcher der Druckraum mit einer Druckleitung verbunden ist. Durch Entlüftung des Druckraumes kann dann der Steuerkolben angehoben und der Luftkanal zur Schnellentlüftung freigegeben werden. Das Entlüften des Druckraumes erfolgt gemäss einer Weiterbildung der Erfindung durch ein Entlüftungsloch in dem Kolbengehäuse. Vorzugsweise sind mehrere solche Entlüftungslöcher vorgesehen, wobei jeweils ausser einem Entlüftungsloch alle geschlossen sind. Die Entlüftungslöcher befinden sich in unterschiedlichen Hubhöhen und entsprechen damit unterschiedlichen Schlagkräften. Durch Verschliessen bzw. Öffnen eines Entlüftungsloches kann damit die Schlagkraft in einfacher Weise geändert und damit an die jeweiligen Anforderungen angepasst werden. Die Feder, welche den Schlagkolben belastet, muss hierbei nicht ausgewechselt werden.According to a development of the invention, it is provided that a pressure chamber is arranged above the control piston and the control piston can be brought into a closed position, in which the pressure chamber is connected to a pressure line. By venting the pressure chamber then the control piston can be raised and the air duct released for quick exhaust. The venting of the pressure chamber is carried out according to an embodiment of the invention by a vent hole in the piston housing. Preferably, a plurality of such vent holes are provided, each except one vent hole are all closed. The vent holes are in different lifting heights and thus correspond to different impact forces. By closing or opening a vent hole so that the impact can be changed in a simple manner and thus adapted to the particular requirements. The spring, which loads the percussion piston, does not have to be replaced.

Weitere vorteilhafte Merkmale ergeben sich aus den abhängigen Patentansprüchen, der nachfolgenden Beschreibung sowie der Zeichnung.Further advantageous features emerge from the dependent claims, the following description and the drawings.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
schematisch ein Schnitt durch einen erfindungsgemässen Klopfer und
Figur 2
ein Schnitt durch den Klopfer gemäss Figur 1, wobei der Schlagkolben angehoben ist.
An embodiment of the invention will be explained in more detail with reference to the drawing. Show it:
FIG. 1
schematically a section through an inventive knocker and
FIG. 2
a section through the knocker according to Figure 1, wherein the percussion piston is raised.

Die Figur 1 zeigt einen Klopfer 1, der ein zylindrisches Gehäuse 2 besitzt, das an einem Ende mit einem Deckel 3 und am anderen Ende mit einer Prallplatte 25 aus Kunststoff zur Dämpfung versehen ist. Die Prallplatte 25 liegt an einem Anschlussflansch 11 an, der mit einer hier lediglich angedeuteten Behälterwandung 22 verschraubt ist. Mit dem Klopfer 1 kann mit kräftigen Schlägen gegen die Behälterwand 22 ein hier nicht gezeigtes gelöstes Material gelockert und zum Ausfliessen gebracht werden. Der Anschlussflansch 11 ist mit dem Gehäuse 2 verschraubt.1 shows a knocker 1, which has a cylindrical housing 2, which at one end with a cover 3 and at the other End is provided with a baffle plate 25 made of plastic for damping. The baffle plate 25 rests against a connecting flange 11, which is screwed to a container wall 22, which is merely indicated here. With the knocker 1 can with strong blows against the container wall 22 a not shown here dissolved material is loosened and made to flow out. The connecting flange 11 is screwed to the housing 2.

Im Deckel 3, der eine Oberwand des Gehäuses 2 bildet, ist eine Entlüftungsbohrung 6 angeordnet, an die vorzugsweise ein Schalldämpfer 10 angeschlossen ist. Diese Entlüftungsbohrung 6 ist mit einer oberen Kammer 18 verbunden, in der eine Spiralfeder 8 oder ein anderes geeignetes Federelement angeordnet ist. Die Feder 8 ist an einem Ende am Deckel 3 und am anderen Ende an einem Schlagkolben 5 abgestützt. Der Deckel 3 ist vorzugsweise auf das Gehäuse 2 aufgeschraubt.In the lid 3, which forms an upper wall of the housing 2, a vent hole 6 is arranged, to which preferably a muffler 10 is connected. This vent hole 6 is connected to an upper chamber 18 in which a coil spring 8 or another suitable spring element is arranged. The spring 8 is supported at one end on the cover 3 and at the other end on a percussion piston 5. The cover 3 is preferably screwed onto the housing 2.

In der Figur 1 ist der Schlagkolben 5 in der Schlagposition gezeigt, in welcher dieser auf der Prallplatte 25 aufliegt. Am vorderen Ende des Kolbens 5 befindet sich ein umlaufender ringförmiger Raum 7, der über eine radiale Anschlussöffnung 12 des Gehäuses 2 mit einer Druckluftleitung 17 verbunden ist. Mittels eines Drosselventils 1.4 kann der Druckaufbau und damit die Intervallzeit in einer ersten Zweigleitung 34 eingestellt werden. Eine zweite Zweigleitung 13 führt zu einer weiteren Anschlussöffnung 23, die wie ersichtlich im Abstand zur Prallplatte 25 radial im Gehäuse 2 verläuft. Diese Anschlussöffnung 23 ist über einen Durchgang 24 des Schlagkolbens 5 mit einem Raum 20 innerhalb eines Steuerkolbens 4 verbunden, der ein Steuerelement bildet. Dieser Steuerkolben 4 ist in einer Bohrung 26 eines ersten Kolbenteils 5a achsial begrenzt verschieblich gelagert und mit Dichtungsringen 27 gegenüber der Bohrung 26 abgedichtet. Frontseitig angeordnete Dichtungselemente 21 dichten in Figur 1 den Steuerkolben 4 gegenüber einer Wandung 28 des Schlagkolbens 5 ab. Mittig in der Wandung 28 ist ein Durchgang 9 angeordnet, der in Figur 1 vom Steuerkolben 4 verschlossen ist. Der Steuerkolben 4 kann auch durch ein anderes Steuerelement, beispielsweise eine Membran ersetzt sein. Der Steuerkolben 4 zeichnet sich jedoch durch besondere Dauerhaftigkeit aus.In the figure 1, the percussion piston 5 is shown in the impact position, in which this rests on the baffle plate 25. At the front end of the piston 5 is a circumferential annular space 7, which is connected via a radial connection opening 12 of the housing 2 with a compressed air line 17. By means of a throttle valve 1.4, the pressure build-up and thus the interval time in a first branch line 34 can be adjusted. A second branch line 13 leads to a further connection opening 23 which, as can be seen, runs radially in the housing 2 at a distance from the baffle plate 25. This connection opening 23 is connected via a passage 24 of the percussion piston 5 with a space 20 within a control piston 4, which forms a control. This control piston 4 is mounted axially displaceably limited in a bore 26 of a first piston part 5a and sealed with sealing rings 27 relative to the bore 26. Front side sealing elements 21 seal in Figure 1, the control piston 4 relative to a wall 28 of the percussion piston 5 from. In the middle of the wall 28, a passage 9 is arranged, which is closed by the control piston 4 in FIG. The control piston 4 can also be replaced by another control element, for example a membrane. However, the control piston 4 is characterized by special durability.

Der Schlagkolben 5 besteht aus einem ersten Kolbenteil 5a sowie einem zweiten Kolbenteil 5b. Diese beiden Kolbenteile 5a und 5b sind fest miteinander verbunden. Gegenüber einer Innenseite 29 des Gehäuses 2 ist der Schlagkolben 5 mittels Dichtungsnuten 19 abgedichtet. Im Schlagkolben 5 verläuft achsial wenigstens ein Lüftungskanal 16, der an einem Ende mit der oberen Kammer 18 und am anderen Ende mit einem ringförmigen Raum 30 verbunden ist. Der Raum 30 ist gemäss Figur 1 durch den Steuerkolben 4 gegenüber dem Durchgang 9 verschlossen.The percussion piston 5 consists of a first piston part 5a and a second piston part 5b. These two piston parts 5a and 5b are firmly connected. Opposite an inner side 29 of the housing 2, the percussion piston 5 is sealed by means of sealing grooves 19. In the percussion piston 5 extends axially at least one ventilation duct 16, which is connected at one end to the upper chamber 18 and at the other end with an annular space 30. The space 30 is closed according to Figure 1 by the control piston 4 with respect to the passage 9.

Der Schlagkolben 5 kann gegen die rückwirkende Kraft der Feder 8 von der Prallplatte 25 angehoben werden, indem über die erste Zweigleitung 34 Druckluft in die untere Kammer 7 eingeleitet wird. Hierbei wird gleichzeitig über die zweite Zweigleitung 13, die Anschlussbohrung 23 sowie über den Durchgang 24 Druckluft in den Raum 20 eingeleitet. Das Drosselventil 14 ist nun so eingestellt, dass hierbei die Druckluft langsamer in die Kammer 7 als in die Kammer 20 einströmt. Dadurch ist dieser Druck in der Kammer 20 grösser als in der Kammer 7 und damit das Ventil 14 verschlossen. Dadurch ist sichergestellt, dass der .Steuerkolben 4 dicht an der Wandung 28 anliegt und der Durchgang 9 verschlossen bleibt. Der Druck in der Kammer 7 ist so gewählt, dass der Schlagkolben 5 gegen die rückwirkende Kraft der Feder 8 angehoben wird. Der Durchgang 9 bleibt hierbei verschlossen. Der Druck in der Kammer 20 bleibt erhalten, bis der Durchgang 24 eine offene Entlüftungsbohrung 15b erreicht, welche radial die Wandung 2 durchdringt. Der Druck in der Kammer 20 fällt damit auf den Umgebungsdruck. Der erhöhte Druck in der Kammer 7 bleibt jedoch erhalten, sodass der Steuerkolben 4 sofort von der Wandung 28 abgehoben wird.The percussion piston 5 can be raised against the retroactive force of the spring 8 of the baffle plate 25 by 34 compressed air is introduced into the lower chamber 7 via the first branch line. In this case, compressed air is simultaneously introduced into the space 20 via the second branch line 13, the connection bore 23 and via the passage 24. The throttle valve 14 is now adjusted so that in this case the compressed air flows into the chamber 7 slower than in the chamber 20. As a result, this pressure in the chamber 20 is greater than in the chamber 7 and thus the valve 14 is closed. This ensures that the control piston 4 bears tightly against the wall 28 and the passage 9 remains closed. The pressure in the chamber 7 is selected so that the percussion piston 5 is raised against the retroactive force of the spring 8. The passage 9 remains closed. The pressure in the chamber 20 is maintained until the passage 24 is an open one Vent hole 15b is reached, which radially penetrates the wall 2. The pressure in the chamber 20 thus falls to the ambient pressure. However, the increased pressure in the chamber 7 is maintained, so that the control piston 4 is lifted immediately from the wall 28.

Wie die Figur 2 zeigt, ist der Durchgang 9 bei abgehobenem Steuerkolben 4 mit dem Luftkanal 16 verbunden. Sind im Schlagkolben 5 mehrere solche Luftkanäle 16 vorhanden, so sind sämtliche Luftkanäle 16 mit dem Durchgang 9 verbunden. Die untere Kammer 7 ist damit über den Durchgang 9, den wenigstens einen Luftkanal 16 und über die Entlüftungsbohrung 6 mit Umgebungsluft verbunden.As FIG. 2 shows, the passage 9 is connected to the air duct 16 when the control piston 4 is lifted off. Are in the percussion piston 5 more such air channels 16 present, all air ducts 16 are connected to the passage 9. The lower chamber 7 is thus connected via the passage 9, the at least one air duct 16 and the vent hole 6 with ambient air.

Damit sinkt sofort der Druck in der unteren Kammer 7 und entsprechend nimmt der Druck auf die Unterseite des Schlagkolbens 5 ab. Die Kraft der Feder 8 auf den Schlagkolben 5 überwiegt damit die Kraft der Druckluft auf den Schlagkolben 5 und dieser bewegt sich damit nach unten und schlägt auf der Prallplatte 25 auf. Die aus der Kammer 7 verdrängte Luft gelangt gemäss den Pfeilen 31 und 32 durch den Durchgang 9 in den Luftkanal 16 und durch die Entlüftungsbohrung 6, in den Schalldämpfer und schliesslich in die Umgebungsluft. Der Schlag auf die Prallplatte 25 wird auf den Anschlussflansch 11 und von diesem auf die Behälterwandung 22 übertragen.This immediately reduces the pressure in the lower chamber 7 and accordingly decreases the pressure on the underside of the percussion piston 5 from. The force of the spring 8 on the percussion piston 5 thus outweighs the force of the compressed air on the percussion piston 5 and this moves down and beats on the baffle plate 25. The displaced from the chamber 7 air passes according to the arrows 31 and 32 through the passage 9 in the air duct 16 and through the vent hole 6, in the muffler and finally in the ambient air. The impact on the baffle plate 25 is transmitted to the connecting flange 11 and from there to the container wall 22.

Der Schlagkolben 5 wird somit angehoben, bis der Durchgang 24 die offene Entlüftungsöffnung 15b erreicht hat. Ist ein grösserer Hub des Schlagkolbens 5 und entsprechend ein stärkerer Schlag gewünscht, so wird die Entlüftungsbohrung 15b verschlossen und die Bohrung 15a durch Entfernen eines Verschlusselementes 33, beispielsweise einer Inbusschraube geöffnet. Die Entlüftungsbohrungen 15c und 15d bleiben weiterhin verschlossen. Soll die Schlagkraft hingegen vermindert werden, so wird die Entlüftungsbohrung 15c oder 15d geöffnet und die entsprechende andere Entlüftungsbohrung 15a bzw. 15b geschlossen. Im gezeigten Ausführungsbeispiel sind vier Entlüftungsbohrungen 15a bis 15d vorgesehen. Selbstverständlich können auch mehr oder weniger Entlüftungsbohrungen vorgesehen sein. Diese sind wie gezeigt etwa in mittlerer Höhe des Gehäuses 2 angeordnet. Deäkbar ist auch eine Ausführung mit einer stufenlos verstellbaren Entlüftungsöffnung. Wesentlich ist hierbei, dass die Feder 8 nicht gewechselt werden muss, wie dies üblich war.The percussion piston 5 is thus raised until the passage 24 has reached the open vent 15b. If a larger stroke of the percussion piston 5 and correspondingly a stronger impact is desired, the venting bore 15b is closed and the bore 15a is opened by removing a closure element 33, for example an Allen screw. The vent holes 15c and 15d remain closed. Should the impact, however, be reduced, the vent hole 15c or 15d is opened and the corresponding other vent hole 15a and 15b closed. In the exemplary embodiment shown, four vent holes 15a to 15d are provided. Of course, more or less vent holes can be provided. These are arranged as shown approximately in the middle height of the housing 2. Dékbar is also a version with a continuously adjustable vent. It is essential here that the spring 8 does not have to be changed, as was usual.

Befindet sich der Schlagkolben 5 in der in Figur 1 gezeigten Stellung, so wird in der unteren Kammer 7 sowie in der Kammer 20 ein Druck aufgebaut. Der Schlagkolben 5 wird damit selbsttätig wieder angehoben, wobei der Durchgang 9 vom Steuerkolben 4 verschlossen gehalten wird. Der oben erwähnte Schlagzyklus beginnt damit von neuem und wird selbsttätig wiederholt, bis der Druck in der Druckluftleitung 17 unterbrochen wird. Der Schlagkolben 5 kehrt dann in die in Figur 1 gezeigte Position zurück.If the percussion piston 5 is in the position shown in FIG. 1, pressure is built up in the lower chamber 7 and in the chamber 20. The percussion piston 5 is thus automatically raised again, the passage 9 is kept closed by the control piston 4. The above-mentioned beat cycle thus begins anew and is repeated automatically until the pressure in the compressed air line 17 is interrupted. The percussion piston 5 then returns to the position shown in FIG.

Claims (8)

  1. Pneumatic chipping hammer, for chipping away at container walls (22) for example, having a housing (2) in which there is mounted a percussion piston (5) which can be moved by compressed air, counter to the reactive force of a spring (8), against a top wall (3) of the housing (2), which spring (8) is disposed in an upper chamber (18) possessing an air vent (6), and having at least one air duct (16) by which air is evacuated from a chamber (7) disposed beneath the percussion piston (5) whenever the percussion piston (5) performs a predetermined stroke, characterized in that the percussion piston (5) contains a control element (4), which for the rapid evacuation of air from the lower chamber (7), upon a predetermined stroke of the percussion piston (5), opens the said air duct (16) and recloses it when the percussion piston (5) is returned to a lower hammering position, the air duct (16) being disposed in the percussion piston.
  2. Chipping hammer according to Claim 1, characterized in that the control element (4) is configured as a control piston.
  3. Chipping hammer according to Claim 1 or 2, characterized in that above the control piston (4) there is disposed a pressure chamber (20) and the control piston (4) can be brought into a closing position in which a passage (9) between the said lower chamber (7) and a chamber (30) of the percussion piston (5) is closed off.
  4. Chipping hammer according to one of Claims 1 to 3, characterized in that the housing (2) has a connecting opening (12) which connects the said lower chamber (7) to a pressure line (17).
  5. Chipping hammer according to Claim 4, characterized in that the housing (2) has a further connecting opening (23) which connects a branch line (13) of the compressed air line (17) to a chamber (20) of the control piston (4).
  6. Chipping hammer according to Claim 5, characterized in that a throttle valve (14) is provided, by which the pressure build-up in the lower chamber (7) can be adjusted.
  7. Chipping hammer according to one of Claims 1 to 6, characterized in that a plurality of air vents (15a to 15d) are provided, which, at different stroke heights, can be connected to a pressure chamber (20) of the control piston (4).
  8. Chipping hammer according to one of Claims 2 to 8, characterized in that the control piston (4) has on the front side a sealing means (21), which, in a closing position, bears against a wall (28) of the percussion piston (5), whereby a passage (9) is closed off.
EP04405024A 2003-01-28 2004-01-12 Pneumatic knocker Expired - Lifetime EP1442999B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1172003 2003-01-28
CH1172003 2003-01-28

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EP1442999A1 EP1442999A1 (en) 2004-08-04
EP1442999B1 true EP1442999B1 (en) 2006-03-29

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EP (1) EP1442999B1 (en)
AT (1) ATE321709T1 (en)
DE (1) DE502004000403D1 (en)
DK (1) DK1442999T3 (en)
ES (1) ES2259437T3 (en)

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Publication number Priority date Publication date Assignee Title
EP1731271A1 (en) 2005-06-09 2006-12-13 Netter Gmbh Pneumatic knocker and method of operating a pneumatic knocker
CN104724411A (en) * 2015-03-29 2015-06-24 浙江东立绿源科技股份有限公司 Vibrating hopper for feed production
EP4117832B1 (en) 2019-03-12 2024-05-15 Moba Group B.V. Method and apparatus for cleaning a stack of objects

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US3253514A (en) * 1964-02-06 1966-05-31 Axel H Peterson Valve control for vibrator and like apparatus operating on elastic fluid
DE1703061C3 (en) * 1968-03-27 1974-02-14 Fried. Krupp Gmbh, 4300 Essen Hydraulically operated piston engine
DE2549551C3 (en) 1975-11-05 1979-05-03 Fa. Jean Netter, 6200 Wiesbaden Pneumatically working knocker
DE3819112A1 (en) 1988-06-04 1989-12-14 Netter Gmbh KNOCKER WITH SELF-CONTROL
US5683230A (en) * 1993-03-25 1997-11-04 Karppinen; Reijo Pressure medium driven device performing linear motion

Also Published As

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DE502004000403D1 (en) 2006-05-18
ATE321709T1 (en) 2006-04-15
ES2259437T3 (en) 2006-10-01
EP1442999A1 (en) 2004-08-04
DK1442999T3 (en) 2006-08-07

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