EP4116539B1 - Tête de perçage d'une tarière, procédé de fabrication d'une tête de perçage d'une tarière et utilisation d'une tête de perçage d'une tarière - Google Patents

Tête de perçage d'une tarière, procédé de fabrication d'une tête de perçage d'une tarière et utilisation d'une tête de perçage d'une tarière Download PDF

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Publication number
EP4116539B1
EP4116539B1 EP22181842.0A EP22181842A EP4116539B1 EP 4116539 B1 EP4116539 B1 EP 4116539B1 EP 22181842 A EP22181842 A EP 22181842A EP 4116539 B1 EP4116539 B1 EP 4116539B1
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EP
European Patent Office
Prior art keywords
chisel
attachment
receptacle
drill head
section
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.)
Active
Application number
EP22181842.0A
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German (de)
English (en)
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EP4116539A1 (fr
Inventor
Franz-Josef Puettmann
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.)
Tracto Technik GmbH and Co KG
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Tracto Technik GmbH and Co KG
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Publication date
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Publication of EP4116539A1 publication Critical patent/EP4116539A1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • E21B4/145—Fluid operated hammers of the self propelled-type, e.g. with a reverse mode to retract the device from the hole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
    • E21B17/0465—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches characterised by radially inserted locking elements

Definitions

  • the invention relates to a drill head of an earth drilling device with a chisel and an attachment, a method for producing a drill head of an earth drilling device and a use of a drill head of an earth drilling device.
  • Ram drilling devices are self-propelled drilling devices.
  • a ram drilling device has a percussion piston which is moved oscillating (back and forth) within a housing and, depending on the desired direction of movement of the ram drilling device, impacts directly or indirectly on a front or rear striking surface of the housing. The kinetic energy of the percussion piston transmitted thereby accelerates the ram drilling device within the soil.
  • an earth drilling device which has a base body with a housing.
  • a percussion piston is movably mounted in the housing.
  • the striking piston moves forward, it strikes the rear end of a firing pin, which forms part of the drill head.
  • the front end of the firing pin forms a drill head tip which, due to its relatively small diameter, ensures high directional stability of the earth drilling device, which is designed as a ram drilling device or earth rocket.
  • Behind the (drill head) tip of the firing pin Two ring-shaped drill head elements are connected one behind the other to the firing pin. The connection is made using two fastening bolts.
  • the fastening bolts are dowel pins in corresponding holes that have a preload.
  • receptacles in a firing pin designed as a chisel and an attachment for a dowel pin in the chisel and attachment in such a way that they complement each other to form an overall receptacle for a dowel pin.
  • the dowel pin can be inserted into the resulting overall receptacle.
  • the receptacles of the chisel and attachment are designed as round grooves, which in turn are adapted to the radius of the roll pin.
  • the invention is based on the object of creating a drill head of an earth drilling device, a method for producing a drill head of an earth drilling device and a use of a drill head of an earth drilling device, so that an improvement of the drill head compared to the aforementioned disadvantages is possible, in particular a simpler type of Attachment of the attachment to the chisel can be made possible. A simpler construction can be enabled. Longer drill head service times may be possible.
  • the core of the invention is to provide a change in the receptacle of the dowel pin, contrary to the previous understanding of those skilled in the art.
  • the invention breaks with the idea of adapting the receptacle for the roll pin in the chisel with high precision with regard to the radius of the roll pin used and thereby providing production with the lowest possible tolerances.
  • the present invention therefore takes a completely contrary approach to high-precision production with low tolerances in relation to the design of the receptacle in the chisel for the dowel pin.
  • the prejudice is broken in such a way that the design of the receptacle in the chisel for the dowel pin is enlarged compared to the design otherwise considered necessary.
  • the core idea of the invention follows the idea of providing a receptacle that is larger than the diameter or radius of the roll pin, which runs counter to the previous idea of providing tight manufacturing tolerances compared to the specification of the radius of the roll pin.
  • the service life can be improved, and despite the enlarged receptacle, the attachment can also be securely attached to the chisel. Deviating from the round groove that was previously only considered for a holder, a different shape than this round groove is even possible.
  • the invention provides a drill head of an earth drilling device with a chisel and an attachment that can be attached to the bit, with at least one roll pin being provided for holding the attachment on the chisel, and the chisel having one or more receptacles for a roll pin, the receptacle is designed to be enlarged compared to the radius of the dowel pin.
  • an “earth drilling device” includes any device that can create or expand a hole in the earth, or is used to insert or pull in pipes or other bodies into the ground.
  • the earth drilling device can in particular have a percussion piston and can be moved intermittently in an existing or to-be-created channel in order to create or expand a bore or to replace or clean an existing pipe in a destructive or non-destructive manner, to pull in lines into existing pipes or other long bodies.
  • the earth drilling device can in particular be a self-propelled impact device for creating a horizontal bore, most preferably a ram drilling device or earth rocket, whereby the terms "ram drilling device” and "earth rocket” can be used synonymously.
  • ram drilling device includes both earth displacement devices in which the drill head tip or the bit is firmly connected to the housing, as well as ram drilling devices with a chisel mounted so that it can move axially relative to the housing.
  • a ram drilling device according to the invention can be both a one-stroke device and a two-stroke device.
  • the percussion piston first strikes the chisel, which advances in the first cycle.
  • the housing is acted upon by the percussion piston in the second cycle. Peak resistance and skin friction are separated in a two-stroke device and alternately overcome more easily.
  • With a two-stroke device there is better energy conversion, which in particular makes it easier to smash obstacles as a result of the concentration of the impact impulse on the chisel.
  • the housing remains in a stationary position and thus ensures relatively good running stability.
  • An earth drilling device in the sense of the invention is not limited to underground earthworks.
  • lines in which an earth drilling device or a drill head can be operated can also run above ground.
  • horizontal drilling in the sense of the description includes in particular any type of existing or to be created, preferably horizontal channels in a body, in particular earth canals including earth drillings, rock drillings or earth pipelines as well as underground or above-ground pipelines and sewage channels, which are created by using a corresponding earth drilling device , expand, destroy, cut open, clean or have it lined and/or renovated by pulling in a line or pipe.
  • the term “drill head” in the sense of the description includes a front end, in particular the front end of the drill string of an earth drilling device.
  • the drill head can in particular have a housing or part of a housing in which the percussion piston hits the chisel.
  • the chisel can be part of the Drill head, with the tip of the bit usually forming the front end of the drill string.
  • chisel in the sense of the description includes an element of the drill string, which contacts the ground with its tip first.
  • the chisel can in particular be a firing pin acted upon by a striking piston.
  • the end acted upon by the percussion piston can be the end spaced from the tip of the chisel.
  • the bit can be present in a housing at the front end of the drill string or can protrude from a housing at the front end of the drill string.
  • attachment in the sense of the description includes an attachment that is placed on the chisel or the firing pin, in particular releasably connected to it, and which is arranged at least partially around the circumference of the chisel.
  • the radial extent of the attachment can essentially correspond to the radial extent (outer contour) of the housing. It can also be provided that the attachment extends radially (slightly) larger than the housing.
  • the attachment can essentially have a conical shape. A design of an attachment with a cone tip is possible.
  • the attachment can have one, two or more radially and/or circumferentially aligned cutting elements, so that the attachment acts as a crown head, as shown in the DE 10 2004 032 551 A1 is described in a two-part configuration, can be designed.
  • An attachment designed as a crown head can also be made in one piece.
  • the attachment can preferably be a step attachment or step head, as shown in DE 2 558 842 A1 is described, be designed. Combinations and mixed forms of the aforementioned configurations of the attachment(s) are possible, for example an attachment can have step-shaped cutting elements.
  • the attachment can be pushed from the outside onto the chisel protruding from the housing at the front end of the drill string.
  • the attachment can be present with its outer surface exposed outside the housing.
  • the attachment can have an inner surface that corresponds to the outer surface of the chisel in the area of a system or support. In the area where the attachment rests on the chisel, both the outer surface of the chisel and the inner surface of the attachment can be conical.
  • the attachment can be an attachment by means of which the external shape and/or function of the chisel can be changed when the attachment is attached.
  • the chisel can form a crown head and/or a step head with the attachment or several attachments or can be converted into a crown head-shaped and/or step head-shaped drill head.
  • the attachment can be attached to the chisel so that it cannot rotate.
  • the invention is described in particular with an attachment on a chisel, but several attachments, in particular two, arranged one behind the other in the longitudinal direction of the chisel, can also be attached to the chisel, for which purpose several receptacles arranged one behind the other in the longitudinal direction can be provided on the chisel each can have an enlarged design in the sense of the description. If multiple attachments can be provided on the chisel, the multiple attachments can have a different radial extent, so that, for example, a front attachment (located closer to the chisel tip) has a smaller diameter or a smaller radial extent than a rear attachment (further from the chisel tip spaced apart).
  • the rear attachment or rearmost attachment can have a radial extent that is essentially the radial Extension of the housing corresponds, it can also be provided that the radial extension of the rear or rearmost attachment is (slightly) larger than the radial extension of the housing.
  • a roll pin or a clamping sleeve is understood to mean an element which serves to attach an attachment to a chisel and is designed as a hollow, slotted pin or sleeve.
  • the terms roll pin and adapter sleeve can be used synonymously.
  • To perform the function of the dowel pin it is usually at least partially or slightly compressed in a receptacle.
  • receptacle in the sense of the description includes a bore, recess, opening, hole, recess, groove or the like, into which the dowel pin is inserted for the purpose of fastening the attachment to the chisel and whose contour or Limitation forms at least a portion of a contact surface for the dowel pin.
  • hole does not primarily refer to the type of production, but rather to the mere provision of the recess, opening, hole, recess or groove.
  • the recording can be created using any machine tool, in particular a drill, a lathe, or a milling machine.
  • the holder can be made with one or more rotating tools and the mechanical removal of chips or fragments. It is also possible to produce the recording using spark erosion, orbital lapping or using a laser.
  • the receptacle, in particular on the attachment can be designed as a through hole or through hole.
  • a receptacle can be provided into which a dowel pin can be inserted or inserted.
  • the chisel and the attachment can thus form an overall receptacle or several overall receptacles for a dowel pin, in that the receptacle(s) in the attachment and chisel can be aligned at least partially overlapping or aligned.
  • a longitudinal axis of the receptacle can be aligned at least in sections transversely to the longitudinal direction of the chisel or the attachment.
  • the receptacle on the chisel or the attachment can extend at least in sections in such a way that the longitudinal axis of the chisel or the attachment is not cut.
  • a receptacle on the chisel can be designed as a bore or recess, which is formed at least over an angular section of the circumference in a cutting plane to the longitudinal axis of the chisel; a hole or recess (receptacle) can extend over the circumference of the chisel, with the hole or recess (receptacle) at a height the longitudinal axis of the chisel can be formed.
  • the receptacle on the chisel can be designed as a recess which is formed on the circumference of the chisel in a cutting plane transverse to the longitudinal axis of the chisel.
  • a section of the recess on the chisel can be designed as a round groove-shaped recess.
  • a receptacle for the dowel pin can be formed, which can be adapted to the position of a receptacle on the chisel and, together with a receptacle on the chisel, can form an "overall receptacle" for the dowel pin.
  • a receptacle designed entirely as a recess on the chisel can, with several assigned receptacles on the attachment, form several “overall receptacles” for one dowel pin each.
  • a section of the roll pin can rest in each of the associated receptacles of the chisel and attachment in order to hold the attachment on the chisel.
  • the depth of the receptacle in the chisel is selected such that there is as little interference as possible on/in the chisel, and on the other hand, the depth is sufficiently dimensioned so that the receptacle, together with the diameter of the dowel pin, is sufficient to hold the attachment on the chisel .
  • the depth of the receptacle is generally in the range of 7% to 20% of the average diameter of a receiving cone for the attachment or on the attachment, preferably in the range of 8% to 18% of the average diameter of a receiving cone for the attachment or on the attachment , particularly preferably in the range from 9% to 16% of the average diameter of a receiving cone for the attachment or on the attachment.
  • the receptacle on the chisel can be designed as a recess which can run transversely to this cutting plane along the circumference of the chisel along cutting planes that can contain the longitudinal axis of the chisel.
  • the receptacle can have substantially the same shape, particularly in the cutting plane, continuously over an angular circumference around the chisel.
  • the receptacle or receptacles on the attachment can be designed in the same and/or corresponding position with respect to the longitudinal axis of the chisel when the attachment is in place and can form one or more overall receptacles through which a dowel pin can be pushed.
  • the receptacle for the dowel pin in the chisel has a contact surface which is smaller than 120° of the circumference of the dowel pin, preferably less than 110° of the circumference of the dowel pin, in particular less than 100° of the circumference of the dowel pin. It can be provided that the receptacle for the dowel pin in the chisel has a contact surface that is larger than 70°, in particular larger than 75°, in particular larger than 80°, in particular larger than 85°, in particular larger than 89°. It has been found that although a small extent of the dowel pin comes into contact with the pick-up of the chisel, it still offers a suitable holding function for the attachment on the chisel.
  • the dowel pin can be largely surrounded on the circumference by the receptacle in the attachment.
  • a contact surface designed on the attachment for the dowel pin can be provided in the receptacle, which can cover an angular range of the dowel pin that is greater than 190°, in particular greater than 200°, in particular greater than 210°, in particular greater than 220°, in particular greater than 230°, in particular greater than 240°.
  • the core idea according to the invention can be expressed in that the dowel pin is free of contact over an angular range, i.e. without contact in the receptacle of the chisel.
  • the dowel pin can have an angular range on its circumference that is contactless for receiving the chisel.
  • the depth of the receptacle in the chisel can be designed to be less than the wall thickness of the dowel pin.
  • the overall recording i.e. H. the receptacle of the chisel for the dowel pin and the receptacle for the dowel pin on the attachment in depth transverse to a cutting plane that contains the longitudinal axis of the chisel are designed such that the receptacle on the chisel is less than a third of the diameter of the dowel pin, in particular a Quarter of the diameter of the dowel pin, in particular a fifth of the diameter of the dowel pin, is deep or high.
  • the receptacle has a contour with a first section which is adapted to the radius of the dowel pin, the contour of the receptacle having a further section which has an enlarged configuration compared to the first section.
  • the possibility can be provided to design a receptacle in such a way that several areas of the receptacle are provided, the receptacle being delimited by a contour which - corresponding to the several areas - has different sections for the individual areas.
  • an area or section of the contour can be provided which is adapted to the radius of the dowel pin and the further area enables the receptacle to be enlarged. This allows the roll pin to be given the opportunity to "relax" or not “compress completely” when it is loaded by a relative movement of the attachment to the chisel, whereby the load on the roll pin can be reduced.
  • a shape or contour of the receptacle on the chisel or on the attachment is considered, a shape or contour is preferably considered in a cutting plane of the chisel and/or the attachment, which contains the longitudinal axis of the chisel and/or the attachment. Sizes and/or positions can relate in particular to the cutting plane of the chisel and/or the attachment, which contains the longitudinal axis of the chisel and/or the attachment.
  • the first section is a section that is adapted to a position of the dowel pin in the unloaded state of the attachment.
  • the unloaded state of the attachment essentially corresponds to the state in which no external forces act on the attachment. In the event that no external forces act on the attachment, the attachment can essentially only be held on the chisel.
  • the first section adapted to the unloaded state can be referred to as a section for the "zero position” or a region of the "zero position" of the dowel pin.
  • the position of the first section and the shape or contour of the first section can be adapted to the "zero position" for the chisel and attachment.
  • the (“zero position") section or the first section can be designed such that the section has a radius or a distance from a center position for the dowel pin that is adapted to the radius of the dowel pin in the essentially unloaded state.
  • the first section can be chosen so that the dowel pin is in line contact with the receptacle and this can also be the case in particular if there is a deviation from the planned theoretical zero position due to the required tolerances (i.e. the attachment is already in the unloaded position compared to the chisel status "moved"). If a dowel pin rests on the first section, the dowel pin can be at least slightly compressed ("prestressed") in order to ensure the holding function.
  • the first section can be designed essentially flat with a surface that is formed along the radius and also extends transversely to the longitudinal axis of the chisel.
  • the first section is essentially linear, so that the areal design can be "reduced to a line", which can be a line of the aforementioned surface with the corresponding radius or distance to the center for the dowel pin can.
  • the essentially linear configuration can extend essentially along the dowel pin or transversely to the longitudinal axis of the chisel.
  • contour in the sense of the description includes the scope or limitation of the recording or the cross section of the recording, which is characterized by the “absence” of material.
  • the (cross-sectional) shape can essentially be considered, which results from a cut transverse to the longitudinal direction of the receptacle or longitudinal direction of the chisel or the attachment, this cut also or alternatively transverse to the longitudinal extent of the tool to be inserted into the receptacle Roll pin can run.
  • the contour of the recording does not necessarily have to be the same or identical over the entire longitudinal extent of the recording. A change in the contour in the direction of the longitudinal extent of the recording is possible.
  • this essentially means a contour that is present in the receptacle and can come into contact with the dowel pin at least in sections; a design in more detail
  • the edge area of the receptacle in relation to the edge of the attachment or the chisel, with which the dowel pin cannot come into contact, is primarily independent of this.
  • section in particular the contour, in the sense of the description includes an area of the cross section of the receptacle or an area of the (cross-sectional) shape of the receptacle.
  • the section can extend over an area transverse to the longitudinal axis of the chisel and transverse to the cross section of the receptacle or the (cross-sectional) shape.
  • the distance of a contour to the center of the receptacle or a center of a dowel pin to be inserted into the receptacle is smaller in a first section than the distance of the contour in a further section. In this way, a particularly simple geometry of the receptacle can be provided or produced by focusing on a center point of the receptacle or the dowel pin to be inserted.
  • the term "contour” or the term “section” is initially used for the indefinite article for each of the preferred embodiments and in the following description of the preferred embodiment the definite article is used for the two terms.
  • the indefinite article at the beginning of the description of a preferred embodiment expresses that the different preferred embodiments do not have to be combined with regard to the design of the contour or the sections of the contour in order to represent a preferred embodiment.
  • a preferred embodiment of an embodiment of the contour or one of the sections of the contour which follows a previously described embodiment of the contour or the sections of the contour in the description, does not have to be based on the previously described embodiment, but can be done without the previously described embodiment get along.
  • Combinations of the described configurations for the “contour” or the “section(s)” are certainly possible, but each configuration of the contour or sections of the contour can represent a preferred embodiment on its own.
  • a first section has a radius that is smaller than the radius of a further section.
  • different sections of the contour of the receptacle are adjacent to one another, so that a receptacle that can be easily constructed and adapted to the dowel pin is possible.
  • the receptacle is enlarged in a section of the receptacle that is arranged closer to the chisel tip in the longitudinal direction of the chisel.
  • the section with the enlargement of the recording can be a further section described in the other embodiments. This makes it possible to ensure that the tolerances in the direction of the longitudinal axis of the chisel and/or attachment are taken into account and that the recording is enlarged in this direction.
  • an enlargement of the receptacle is designed as a straight line, which is inclined in particular with respect to the longitudinal direction of the chisel.
  • the straight line can be part of a section of a contour of the recording.
  • the straight line can be part of the further section of the other described embodiments.
  • the straight line can be the further section of the other described embodiments. This allows a simple design of the enlargement of the recording to be achieved.
  • the straight line as part of a section of a contour of the receptacle can be arranged in the longitudinal direction of the chisel closer to the chisel tip than the first section.
  • the straight line can connect directly or indirectly to the first section.
  • the recording consists of the straight line and the first section with a radius.
  • the first section with the radius, together with the inserted dowel pin, can specify a relative position of the chisel to the attachment in which the attachment cannot be moved further in the direction pointing away from the chisel tip.
  • the first section may be a boundary surface for the roll pin in a direction away from the bit tip.
  • the straight line allows for a relative movement of the attachment and the chisel, allowing the attachment to be pushed closer to the tip of the chisel.
  • a receptacle with a section designed as a straight line is designed in such a way that the attachment and the chisel form an overall receptacle in which the dowel pin is in an unloaded position of the attachment ("zero position"), i.e. no effect on the attachment Forces from outside, at least partially applied to the section designed as a straight line - in addition to a possible system on the first section.
  • a linear contact of the dowel pin in the receptacle can be aimed for even when the attachment is loaded, which leads to a relative movement between the attachment and the chisel, in which the attachment can move in the direction of the chisel tip.
  • the inclination of the straight line that may be present in a contour has an angle between 5° and 20°, in particular between 10° and 20°, in particular relative to the longitudinal direction of the chisel or attachment between 12° and 18°, especially between 14° and 18°.
  • the design of the values mentioned is easily accessible and manageable for production and planning by the people entrusted with it.
  • the inclination can increase compared to the tip of the chisel.
  • an enlargement of the receptacle can be present in a section of the receptacle that is further apart from the chisel tip in the longitudinal direction of the chisel than one or more other possible sections of the receptacle.
  • the section with the enlargement of the recording can be a further section described in the other embodiments. This can ensure that even in a possible relative direction of movement of the attachment on the chisel "backward" or away from the chisel tip, relaxation or relief of the tension pin can be present or achieved. Any possible notch effect that may occur can be reduced.
  • the invention also provides a method of manufacturing a drill head of an earth drilling device, the drill head having a bit and an attachment.
  • the attachment can be attached to the chisel.
  • the attachment can be held on the chisel by means of at least one roll pin and the chisel has one or more receptacles for the dowel pin, the receptacle being designed to be enlarged compared to the radius of the dowel pin.
  • the invention also provides use of a drill head of an earth boring apparatus, the drill head having a bit and an attachment attachable to the bit.
  • a roll pin is used to hold the attachment to the chisel.
  • the chisel has one or more receptacles for the dowel pin, with a receptacle design that is larger than the radius of the dowel pin being used.
  • the invention is described in terms of a drill head, a method for producing a drill head and a use of a drill head.
  • the description of each of the three aspects mentioned complement each other, so that in particular the description of the drill head can also be used to describe the method for producing the drill head and/or the use of a drill head of an earth drilling device.
  • the aspects complement each other and can be freely exchanged, supplemented and/or used with regard to their formal design of device features, process features and usage features.
  • transverse as a directional or geometric indication relative to another direction includes an angle of 90°, but also deviations from this, in order to take particular tolerances into account when manufacturing the components.
  • the term “transverse” includes an angle included with the reference direction in the range of approximately 5° to 175°, preferably between approximately 20° and approximately 160°, more preferably between approximately 35° and approximately 145°, particularly preferably between approximately 50° and about 130°, most preferably between about 65° and about 115°, most preferably between about 70° and about 110°, most preferably between about 80° and about 100°, most preferably between about 95° and about 95 °.
  • this numerical specification includes not only the pure value itself, but also a range specification of an interval with boundary values, which is made up of the pure value +/-10%, in particular +/ - 5%, result.
  • Fig. 1 shows an example of an earth drilling device 1, which is designed as a self-propelled impact device.
  • a chisel 2 which is part of a drill head 102, protrudes from a housing 100.
  • the chisel 2 has a chisel tip 11.
  • the end of the chisel 2 can be acted upon by means of a percussion piston 14 which moves back and forth in the housing 100.
  • the percussion piston hits the end spaced from the chisel tip 11 in a pulse-like manner.
  • the drill head 102 has the chisel 2 and an attachment 3 attached to the chisel 2.
  • Fig. 2 shows an enlarged view of the attachment of the attachment 3 to the chisel 2, as previously done:
  • the attachment 3 has a conical (center) bore 8 with which the attachment 3 is attached to the chisel 2, which has a conical outer surface 9 , is pressed on.
  • the conical contact surfaces of the bore 8 and the outer surface 9 are adapted to one another.
  • the connection is secured by means of several dowel pins 7 (four are selected in the exemplary embodiment shown) under a defined pretension, which braces the attachment 3 against the chisel 2.
  • the state of the art, as stated in the Fig. 2 is shown to adhere to very tight tolerances.
  • the entire contour of the receptacle 6 is adapted to the diameter of the dowel pin 7;
  • the contour K of the receptacle 6 is formed entirely by means of one and the same section 20, which is adapted to the diameter of the dowel pin 7 as a radius section.
  • a now planned embodiment of the receptacle 6 on the chisel 2 is shown in a preferred embodiment: the attachment 3 is in an edge-side (extreme) position on the chisel 2; the dowel pins 7 generate a preload between the attachment 3 and the chisel 2.
  • the attachment 3 is shown in an unloaded state, ie free from external forces.
  • the recordings 6 on the chisel 2 have a section 20 with a contour K (adapted or suitable radius) adapted to the dowel pin 7.
  • FIG. 6 an embodiment of the receptacle 6 on the chisel 2 is shown in a further preferred embodiment:
  • the attachment 3 is in an unloaded state on the chisel 2, ie free from external forces, similar to the situation Fig. 3 .
  • the contour K of the receptacle 6 on the chisel 2 has the section 20 which is adapted to the dowel pin 7.
  • a section 22 is designed at a distance from the chisel tip, which has a larger radius than the radius of the section 20 adapted to the dowel pin 7.

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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Claims (10)

  1. Tête de perçage d'une tarière (1) avec un trépan (2) et un embout (3) qui peut être fixé sur le trépan (2), au moins une goupille de serrage (7) étant prévue pour maintenir l'embout (3) sur le trépan (2), et le trépan (2) présentant un ou plusieurs logements (6) pour une goupille de serrage (7), caractérisée en ce que le logement (6) est conçu de manière agrandie par rapport au rayon de la goupille de serrage (7).
  2. Tête de perçage selon la revendication 1, dans laquelle le logement (6) présente un contour (K) avec une première section (20) qui est adaptée au rayon de la goupille de serrage (7), le contour (K) du logement (6) présentant une autre section (21) qui présente une conception agrandie par rapport à la première section (20).
  3. Tête de perçage selon la revendication 1 ou 2, dans laquelle la distance d'une première section (20) du contour (K) au centre du logement (6) est inférieure à la distance du contour (K) dans une autre section (21).
  4. Tête de perçage selon l'une des revendications 1 à 3, dans laquelle le logement (6) présente, dans une première section (20), un rayon inférieur au rayon d'une autre section (21).
  5. Tête de perçage selon l'une des revendications 1 à 4, dans laquelle différentes sections (20, 21) du contour (K) du logement (6) sont adjacentes.
  6. Tête de perçage selon l'une des revendications 1 à 5, dans laquelle un agrandissement du logement (6) est présent dans une section (21) du logement (6) qui est située plus près de la pointe du trépan (11) dans la direction longitudinale (L) du trépan (2).
  7. Tête de perçage selon l'une des revendications 1 à 6, dans laquelle un agrandissement du logement (6) est conçu sous la forme d'une droite (12), qui est notamment inclinée par rapport à la direction longitudinale (L) du trépan (2).
  8. Tête de perçage selon la revendication 7, dans laquelle l'inclinaison des droites (12) par rapport à la direction longitudinale présente un angle compris entre 5° et 20°, en particulier entre 10° et 20°, en particulier entre 12° et 18°, en particulier entre 14° et 18°.
  9. Procédé de fabrication d'une tête de perçage d'une tarière (1), la tête de perçage comprenant un trépan (2) et un embout (3) qui peut être fixé au trépan (2), l'embout (3) pouvant être maintenu sur le trépan (2) au moyen d'au moins une goupille de serrage (7), et le trépan (2) comprenant un ou plusieurs logements (6) pour la goupille de serrage (7), caractérisé en ce que le logement (6) est conçu de manière agrandie par rapport au rayon de la goupille de serrage (7).
  10. Utilisation d'une tête de perçage d'une tarière (1), la tête de perçage présentant un trépan (2) et un embout (3) qui peut être fixé au trépan (2), une goupille de serrage (7) étant utilisée pour maintenir l'embout (3) sur le trépan (2), et le trépan (2) présentant un ou plusieurs logements (6) pour la goupille de serrage (7), caractérisée en ce qu'une conception du logement (6) agrandie par rapport au rayon de la goupille de serrage (7) est utilisée.
EP22181842.0A 2021-07-05 2022-06-29 Tête de perçage d'une tarière, procédé de fabrication d'une tête de perçage d'une tarière et utilisation d'une tête de perçage d'une tarière Active EP4116539B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021003448.1A DE102021003448A1 (de) 2021-07-05 2021-07-05 Bohrkopf elner Erdbohrvorrichtung, Verfahren zum Herstellen eines Bohrkopfs einer Erdbohrvorrichtung und Verwendung eines Bohrkopfs einer Erdbohrvorrichtung

Publications (2)

Publication Number Publication Date
EP4116539A1 EP4116539A1 (fr) 2023-01-11
EP4116539B1 true EP4116539B1 (fr) 2024-03-06

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EP22181842.0A Active EP4116539B1 (fr) 2021-07-05 2022-06-29 Tête de perçage d'une tarière, procédé de fabrication d'une tête de perçage d'une tarière et utilisation d'une tête de perçage d'une tarière

Country Status (4)

Country Link
US (1) US11970909B2 (fr)
EP (1) EP4116539B1 (fr)
AU (1) AU2022204803A1 (fr)
DE (1) DE102021003448A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2558842A1 (de) 1975-12-27 1977-07-07 Paul Schmidt Selbstgetriebenes pneumatisches rammbohrgeraet, insbesondere fuer erdbohrungen
CA2036602C (fr) 1990-02-28 2001-04-24 Takeshi Hayashi Outil d'excavation
EP0732164B1 (fr) * 1995-03-17 1999-08-25 Hawera Probst GmbH Outil de perçage, en particulier pour le perçage par percussion de la pierre
US6148935A (en) * 1998-08-24 2000-11-21 Earth Tool Company, L.L.C. Joint for use in a directional boring apparatus
US6273201B1 (en) * 2000-02-16 2001-08-14 Earth Tool Company, L.L.C. Pneumatic ground piercing tool with movable chisel head
DE102004032551B4 (de) 2004-07-06 2015-07-23 Tracto-Technik Gmbh Bohrkopf
US7954225B2 (en) * 2006-03-08 2011-06-07 Webb Charles T Locking pin for coupling components
DE102010015465A1 (de) 2010-04-16 2011-10-20 Tracto-Technik Gmbh & Co. Kg Erdbohrvorrichtung
US20120111641A1 (en) * 2010-09-13 2012-05-10 Pak Yiu Ho Detachable drill bit
DE102019005132B4 (de) * 2019-07-24 2023-10-19 Tracto-Technik Gmbh & Co. Kg Selbstgetriebener Bohrkopf

Also Published As

Publication number Publication date
US20230003087A1 (en) 2023-01-05
AU2022204803A1 (en) 2023-01-19
EP4116539A1 (fr) 2023-01-11
DE102021003448A1 (de) 2023-01-05
US11970909B2 (en) 2024-04-30

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