EP3415708A1 - Dispositif de forage - Google Patents

Dispositif de forage Download PDF

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Publication number
EP3415708A1
EP3415708A1 EP18160727.6A EP18160727A EP3415708A1 EP 3415708 A1 EP3415708 A1 EP 3415708A1 EP 18160727 A EP18160727 A EP 18160727A EP 3415708 A1 EP3415708 A1 EP 3415708A1
Authority
EP
European Patent Office
Prior art keywords
axis
rotation
hydraulic cylinder
ramp
drilling
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
EP18160727.6A
Other languages
German (de)
English (en)
Other versions
EP3415708B1 (fr
Inventor
Dipl.-Wi.-Ing. Dietmar JENNE
Roman GRABER
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.)
Terra AG fuer Tiefbautechnik
Original Assignee
Terra AG fuer Tiefbautechnik
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 Terra AG fuer Tiefbautechnik filed Critical Terra AG fuer Tiefbautechnik
Publication of EP3415708A1 publication Critical patent/EP3415708A1/fr
Application granted granted Critical
Publication of EP3415708B1 publication Critical patent/EP3415708B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/04—Supports for the drilling machine, e.g. derricks or masts specially adapted for directional drilling, e.g. slant hole rigs
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal drilling

Definitions

  • the invention relates to a drilling device, in particular for directional HorizontalDo drilling.
  • a drilling device is also referred to as a horizontal drilling device.
  • the drilling device has a chassis and a drill ramp.
  • the drill ramp is arranged pivotably relative to the chassis for setting a tilt angle between the drill ramp and the ground or an angle of inclination between the drill ramp and the chassis.
  • a drill head arranged at the tip of a linkage is introduced into the ground and guided through the soil at a desired depth and with a desired course.
  • Such horizontal drilling is also referred to as Horizontal Directional Drilling (HDD) method.
  • HDD Horizontal Directional Drilling
  • Horizontal drilling devices are known in which a compound composed of several rod sections linkage is introduced by means of the horizontal drilling device at a starting point in the soil.
  • the horizontal drilling device can introduce high-pressure rinsing liquid into the hollow linkage, which then exits the drill head at high pressure. Due to the high pressure of the rinsing fluid and the carbide teeth of the drill head, a borehole is introduced into the soil.
  • the chassis is either tilted or it is also raised by an opposite support ramp behind the chassis also on the side facing away from the bottom plate from the ground, so that the chassis itself is arranged parallel to the earth's surface.
  • the drilling device loses friction to the earth's surface, so that the drilling device is no longer as stable on the earth's surface, as in the direct contact of the chassis with the surface.
  • the object of the invention is to provide a drilling device in which the inclination of the drill ramp can be set such that contact of the chassis is possible even with different inclinations of the drill ramp. It is therefore desired that the drill ramp and / or a bottom plate forming the front part of the drill ramp as well as the chassis contact the earth's surface with as many inclinations of the drill ramp as possible.
  • a pivotable arm in particular a lever arm is provided, whose first end is rotatably connected to the chassis about a first axis of rotation and whose second end is rotatably connected to the drill ramp about a second axis of rotation, in particular with a tilt adjustment of Bohrrampe the Drill ramp are moved in a circular path around the first axis of rotation, so that both the distance to the chassis and the position in the longitudinal direction of the Chassis can be changed so that the drill ramp does not have to be positioned below the chassis at both flat entrance angles and steep entry angles. As a result, the chassis must not be raised even at steep entry angles.
  • the drilling ramp is thus preferably arranged pivotably relative to the chassis for setting an angle of inclination between the drilling ramp and the ground or an angle of inclination between the drilling ramp and the chassis.
  • the angle of inclination or entry angle is set by pivoting the pivotable arm with the aid of the first hydraulic cylinder and additionally by pivoting the drilling ramp about the second axis of rotation by means of the second hydraulic cylinder.
  • the device has a control unit for controlling the first hydraulic cylinder and for controlling the second hydraulic cylinder.
  • a desired inclination of the drill ramp to the chassis or the drill ramp to the ground can be easily adjusted.
  • a simultaneous control of the first hydraulic cylinder and the second hydraulic cylinder can take place with the aid of the control unit, so that a simple presentation of the angle of inclination is possible.
  • the chassis, the lever, the drill ramp and the second hydraulic cylinder form a coupling gear, wherein the second hydraulic cylinder is a variable-length member is particularly advantageous.
  • the other links of the linkage i. the chassis, the lever and the drill ramp, elements with fixed longitudinal distances between the points where they are contacted by the other members of the linkage. It is particularly advantageous if all six axes of rotation are parallel. As a result, very simple construction of the device is possible.
  • the fourth axis of rotation extends in a horizontal plane, which is arranged between the horizontal planes in which extend the first and the second axis of rotation is particularly advantageous.
  • the fourth axis of rotation and the second axis of rotation lie on the same line, ie the second and the fourth axis of rotation coincide. As a result, a simple construction of the device is possible.
  • the first and third axes of rotation are at a horizontal distance, i. at least at a distance in the direction of the longitudinal axis of the chassis, are arranged to each other.
  • the sixth axis of rotation may be arranged at least at a distance in the direction of the longitudinal axis of the linkage or the longitudinal axis of the drill ramp to the second axis of rotation.
  • the second and the sixth axis of rotation have a horizontal distance from one another.
  • the first axis of rotation and the second axis of rotation are on the same straight line, i. it is the same axis of rotation. Also by these constructive measures a simple structure is achieved. In addition, by this structure, the inclination angle of the Bohrrampe can be easily adjusted.
  • the drill ramp for holding and guiding a drill string is used and a third drive unit, preferably a hydraulic motor, is provided for rotating and axial feed of the drill string.
  • the third drive unit may also be provided only for rotating the drill string and a fourth drive unit for advancing the drill string. This allows a simple drive of the drill string done.
  • a linkage magazine for receiving a plurality of linkage sections, a fifth drive unit for driving the chassis, an operator station for operating the drilling device and / or a mixing device for processing a rinsing liquid are provided.
  • a simple and compact construction of the drilling device is achieved.
  • a contact area for support on the ground is present at one end of the drill ramp.
  • at least the contact region of the drill ramp projects laterally beyond the chassis. This allows a simple support and support of the drill ramp done.
  • the contact region is formed by a base plate connected to the drilling ramp and pivotable about at least one seventh axis of rotation.
  • a control unit can then control the second hydraulic cylinder in such a way that it carries out an adjustment movement during an adjustment movement of the first hydraulic cylinder such that the seventh rotation axis is arranged in the same horizontal plane after the adjustment movement of the first and second hydraulic cylinders as before the adjustment movement.
  • the control unit to increase the entry angle of the drill string in the ground the first hydraulic cylinder drive such that the second axis of rotation moves on a circular path about the first axis of rotation by a vertical distance upwards and thus also from the point of entry of the linkage in the horizontal direction becomes.
  • control unit controls the second hydraulic cylinder such that the drilling ramp is rotated about the second rotation axis, so that the contact area is arranged at least before and after the change of the entrance angle in the same horizontal plane.
  • This allows easy handling of the drilling device.
  • two rollers can still be connected to the drill ramp, which are arranged rotatably about the seventh axis of rotation, so that the end of the drill ramp, on which the rollers are arranged, can be moved by means of the rollers on the ground.
  • control unit for reducing the entry angle controls the first hydraulic cylinder such that the second rotational axis is moved in a circular path about the first axis of rotation by a vertical distance downwards and in particular to the point of entry of the linkage in the horizontal direction. Furthermore, the control unit controls the second hydraulic cylinder such that the drilling ramp is rotated about the second rotation axis, so that the contact area is arranged at least before and after the change of the entrance angle in the same horizontal plane. This ensures that even when reducing the entrance angle secure support over the bottom plate or the contact area can be made, with a very simple handling and operation is achieved by the described control of the hydraulic cylinder.
  • control unit controls the second hydraulic cylinder in such a way that it carries out an adjusting movement during an adjustment movement of the first hydraulic cylinder such that the seventh rotation axis remains in the same horizontal plane during the adjustment movements of the first and the second hydraulic cylinder.
  • the drill ramp comprises at least one anchoring device for anchoring the drill ramp in the ground.
  • the anchoring device may be connected to the bottom plate of the drilling ramp. This allows a simple and secure anchoring of the drilling device done in the ground.
  • the angle of inclination of the drilling ramp and / or the drill string is adjustable by means of the first and the second hydraulic cylinder by an angular range between 10 ° and 30 °, in particular by an angular range of 20 °.
  • This angle of inclination is also referred to as the entry angle of the drill pipe into the soil or as the working angle.
  • the drill ramp can be tilted relative to the chassis such that an entry angle of the drill string in the range between 10 ° and 30 °, in particular between 10 ° and 25 °, is adjustable. In this way, a suitable entry angle can be selected and set.
  • the drill ramp has a first connection region for connecting the arm to the drill ramp and if the drill ramp has a second connection region for alternatively connecting the arm to the drill ramp, wherein the connection regions have at least one distance in the direction of the longitudinal axis of the drill ramp.
  • the second end of the arm is selectively connectable to the first connection region or to the second connection region, so that the position of the second rotation axis on the drilling ramp can be changed.
  • the drilling ramp is provided relative to the chassis and / or the travel position of the first and / or second hydraulic cylinder.
  • the position of the piston relative to the cylinder housing is considered here as the travel position.
  • all the pull cylinders are designed as double-acting hydraulic cylinders. As a result, a simple and robust structure and a simple control of the drilling device are possible.
  • Fig.1 shows a partially simplified side view of a drilling apparatus 10, which operates according to a horizontal drilling method, which is also referred to as Horizontal Directional Drilling (HDD) method, according to a first embodiment.
  • This drilling device 10 is used both for introducing a pilot hole in the soil 90 and for expanding an already present in the soil 90 bore or opening.
  • Such a drilling device is for example from the document DE 10115 233 A1 known.
  • a linkage composed of a plurality of linkage sections 16a is drilled in the direction of the arrow P0 into the soil at a point of entry P1 with a drill bit (not shown) located at the end of the linkage remote from the boring device 10 90 introduced.
  • this can then be widened by means of a widening head and preferably at the same time a tube can be pulled into the widened opening.
  • the expansion head is connected to the end of the linkage remote from the drilling device 10 and the linkage is moved back to the original entry point P1 by means of the drilling device 10.
  • retracting the pilot hole is then widened by the expander.
  • the drilling apparatus 10 comprises a chassis 12 and a drilling ramp 14. Above the drilling ramp 14, a boom changer 16 is arranged and connected to the drilling ramp 14.
  • the linkage changer 16 includes a plurality of linkage portions 16 a, which transported to extend the linkage individually in an area below the linkage changer 16 and there with the drill-side end of the linkage and with a rod receiving 20 a drive unit 18 of the drilling device 10 are connected. To shorten the linkage, individual linkage sections 16a can be separated from the linkage and then transported to the linkage magazine of the linkage changer 16.
  • the drive unit 18 serves to generate a rotational movement of the linkage and thus a rotational movement of the drill head connected to the linkage.
  • the drive unit 18 is preferably a hydraulic motor, which is arranged on a drive carriage 19 together with the rod holder 20.
  • the drive carriage 19 can be moved in the direction of the arrow P0 with the aid of a further drive unit 22, which comprises a plurality of hydraulic cylinders in the present exemplary embodiment.
  • a displacement movement of a linkage connected to the boom support 20 and the drilling or expansion head is then effected.
  • the drill ramp 14 and the chassis 12 are connected via a lever 24, the first end of which is pivotally connected to the chassis about a first axis of rotation 26 and whose second end is rotatably connected to the drill ramp 14 about a second axis of rotation.
  • the lever 24 is pivotable about the first axis of rotation 26.
  • a first end of the hydraulic cylinder 30 is pivotable about a third axis of rotation 32 with the chassis and a second end of the hydraulic cylinder 30 is connected to the lever 24 about a fourth axis of rotation 34.
  • Fig.1 the hydraulic cylinder 30 is shown in a retracted position, in which the lever 24 is disposed at its lower position.
  • the lever 24 is pivoted about the first axis of rotation 26, so that the axis of rotation 28 is moved on a circular path about the axis of rotation 26 around.
  • the chassis 12 is further connected via a second hydraulic cylinder 36 to the drill ramp 14, wherein the hydraulic cylinder 36 is pivotally connected about a fifth axis of rotation 38 to the chassis 12 and about a sixth axis of rotation 40 pivotally connected to the drill ramp 14.
  • the second hydraulic cylinder 26 is in Fig.1 shown in a retracted position.
  • a bottom plate 42 is arranged, which is connected about a seventh axis of rotation 43 pivotally connected to the remaining portion of the drill ramp 14.
  • the bottom plate 42 can always be arranged parallel to the ground 90 even at different entry angles ⁇ 1 or contact the ground 90 over a wide area.
  • two rollers 45 are provided which are freely rotatably mounted about a common axis of rotation, so that the drill ramp 14 can be pushed over the soil 90 and / or pulled.
  • a unit 44 for introducing a total of two ground anchors 46 is provided.
  • the unit 44 is pivotable about an eighth axis of rotation 43 and / or about the axis of rotation of the rollers 45, so that the drilling anchors 46 with different inclinations, in particular obliquely, can be introduced into the soil 90.
  • the unit 44 thus serves as anchoring unit 44 for the drilling device 10. Further details or alternative embodiments of the anchoring unit 44 are, for example, from the document DE 195 06 337 C1 known.
  • the drill ramp 14 further comprises breakaway devices 48, 50, by means of which, in conjunction with the drive unit 18, boom sections 16a can be separated from one another and from the boom mount 20. Further, a cooler 52 of a hydraulic unit, not shown, and a tank 54 for providing the fuel for the hydraulic unit can be seen. Furthermore, a monitor 56 for a positioning system of the drill head connected to the linkage and an operating unit 58 for operating the breakaway device 48, 50 are connected to the drill ramp 14. The operating unit for operating the drilling apparatus 10 has been hidden to better illustrate the other components of the drilling apparatus 10. However, the drilling device 10 in the Practice a control station, via which an operator can both move the chassis 12 and operate the drilling apparatus 10 during the drilling process and monitor include.
  • the chassis 12, the arm 24, the drill ramp 14 and the second hydraulic cylinder 36 form a coupling gear or a four-bar linkage.
  • the second hydraulic cylinder 36 is in this case preferably a variable-length member of the linkage.
  • Fig.2 shows a further side view of the drilling device 10 after Fig.1 .
  • the drill ramp 14 of the drilling device 10 in Fig.2 shown in a second pivot position, ie the entry angle ⁇ 1 after Fig.1 has been increased by the pivoting of the drill ramp 14 to the angle ⁇ 2.
  • the first hydraulic cylinder 30 has been completely and the second hydraulic cylinder 36 has not been fully extended.
  • the drilling ramp 14 has been moved away from the original entry point P1, so that the distance L2 between the new entry point P2 and the rear end of the drilling apparatus 10 has been reduced.
  • Figure 3 shows a further side view of the drilling device after the Fig.1 and 2 ,
  • the drilling ramp 14 of the drilling device 10 is in Figure 3 shown in a third pivot position.
  • both the first hydraulic cylinder 30 and the second hydraulic cylinder 36 have been further extended to its final position.
  • the chassis 12 has been positioned on a raised position at the point of entry P3 with respect to the ground by the distance L4.
  • the required working length of the drilling device 10 between the new entry point P3 and the rear end of the drilling device 10 has further reduced to the length L3, in the specific embodiment at 4.297 m.
  • the drill ramp 14 has a first connection region 68 for connecting the arm 24 Furthermore, the drilling ramp 14 has a second connecting portion 70 for connecting the arm 24 to the drilling ramp 14, wherein the first connecting portion 68 and the second connecting portion 70 at least a distance in the direction of the longitudinal axis of the drill ramp 14 to each other.
  • the second end of the arm 24 is selectively connectable to the first connection region 68 or to the second connection region 70.
  • the first and second hydraulic cylinders are then adjusted so that at least in a part of the adjustment range of the pivotal position of the drill ramp 14, the bottom plate 42 as well as the chassis 12 on the surface of the ground, ie in the same plane, are arranged.
  • FIG. 4 shows a perspective view of the chassis 12 of the drilling apparatus 10 after the Fig.1 to 3 in which the two parallel chain drives 60, 62 are visible.
  • the chassis 12 includes a support member 64, which is pressed by means of another hydraulic cylinder 66 in a support position in which the support member 64 with a pressing force against the soil 90, and in a traveling position in which the support member 64, the soil 90 not can be contacted, moved.
  • the support member 64 and the hydraulic cylinder 66 in the Fig.1 to 4 not shown.
  • the chain drives 60, 62 are each driven by a separate hydraulic motor.
  • eyebolts 68, 70 are provided on the chassis, can be hung in the ropes of a crane for lifting the drilling device 10.
  • the lever 24 comprises lateral cheeks 24a, 24b, between which a portion of the first hydraulic cylinder 30 is arranged.
  • the longitudinal axis of the hydraulic cylinder 30 intersects in a vertical plane the connecting line between the first axis of rotation 26 and the second axis of rotation 28.
  • the orthogonal connecting lines between the first axis of rotation 26 and the second axis of rotation 28, between the second axis of rotation 28 and the fourth axis of rotation 34 and between the fourth axis of rotation 34 and the first axis of rotation 26 form a triangle.
  • the triangle may be an isosceles triangle, wherein the two equal length legs between the first and the fourth axis of rotation and between the second and the fourth axis of rotation are arranged.
  • the leg between the first axis of rotation 26 and the second axis of rotation 28 in a plurality of advantageous embodiments is longer than the leg between the second axis of rotation 28 and the fourth axis of rotation 34 and / or between the first and the fourth axis of rotation.
  • first, second, and fourth axes of rotation are orthogonal to a straight line.
  • Figure 5 shows a further side view of the drilling device 10 after the Fig.1 to 4
  • the side view after Figure 5 shows opposite side of the drilling device 10 with respect to the representations of Fig.1 to 3
  • the drilling ramp has been pivoted by means of the first hydraulic cylinder 30 and the second hydraulic cylinder 36 into a driving position in which the drilling ramp has a sufficient distance from the earth's surface 90.
  • all the elements of the drilling device 10 is displayed, in particular the elements of the control station 80 and a pump for pumping rinsing fluid, which is pumped via the boom support in the hollow rod sections 16a of the linkage.
  • Figure 6 shows a simplified schematic representation of a side view of a drilling apparatus 100 according to a second embodiment.
  • the construction and the function of the drilling apparatus 100 are largely in accordance with the drilling apparatus 10 according to the first embodiment of the Fig.1 to 5 match.
  • Elements with the same structure or the same function have the same reference numerals.
  • a bottom plate 102 which has no traversing rollers 45, but rests flat on the surface of the soil 90.
  • a representation of the drive units to move the drive carriage 19 is in the simplified representation to Figure 6 to clearer presentation of the required for setting different inclination angle ⁇ of the drill ramp 14 components have been omitted.
  • both the first hydraulic cylinder 30 and the second hydraulic cylinder 36 have been fully extended to their final positions.
  • the distance between the first axis of rotation 26 and the second axis of rotation 28 caused by the lever 24 can be increased, thereby resulting in an enlarged adjustment range of the drilling ramp 14, so that in particular entry angles in the range between 10 ° and 30 °, in particular between 10 ° and 35 ° or between 10 ° and 40 °, are possible.
  • the bottom plate 42, 102 rests on the surface of the soil 90 in the same plane in which the chassis 12 is on the surface of the soil 90.

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  • Engineering & Computer Science (AREA)
  • 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)
EP18160727.6A 2017-06-16 2018-03-08 Dispositif de forage Active EP3415708B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017113247.3A DE102017113247A1 (de) 2017-06-16 2017-06-16 Bohrvorrichtung

Publications (2)

Publication Number Publication Date
EP3415708A1 true EP3415708A1 (fr) 2018-12-19
EP3415708B1 EP3415708B1 (fr) 2023-11-15

Family

ID=61616820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18160727.6A Active EP3415708B1 (fr) 2017-06-16 2018-03-08 Dispositif de forage

Country Status (3)

Country Link
EP (1) EP3415708B1 (fr)
DE (1) DE102017113247A1 (fr)
PL (1) PL3415708T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115635536A (zh) * 2022-10-30 2023-01-24 华智源电气集团股份有限公司 一种变压器箱体多角度钻孔工具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019106486A1 (de) * 2019-03-14 2020-09-17 TERRA AG für Tiefbautechnik Bohrvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205627A (en) * 1962-07-09 1965-09-14 Ingersoll Rand Co Rock drill mounting
GB1496568A (en) * 1974-05-07 1977-12-30 Linden Alimak Ab Drilling apparatus
US6527063B2 (en) * 2000-02-17 2003-03-04 Wendall D. Rust Directional boring device
US20100294570A1 (en) * 2008-02-20 2010-11-25 Fredrik Saf Boom arrangement for a rock drill and rock drill rig
US20110174545A1 (en) * 2010-01-15 2011-07-21 Vermeer Manufacturing Company Drilling machine and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506337C1 (de) 1995-02-23 1996-03-14 Terra Ag Tiefbautechnik Verankerungsvorrichtung für einen Bohrwagen einer mobilen Erdbohreinrichtung
DE10115233C5 (de) 2000-05-11 2011-09-15 TERRA AG für Tiefbautechnik Horizontalbohranlage
DE102013111350A1 (de) 2013-10-15 2015-04-16 TERRA AG für Tiefbautechnik Aufweitwerkzeug und Vorrichtung zum Aufweiten einer im Erdreich vorhandenen Durchgangsöffnung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205627A (en) * 1962-07-09 1965-09-14 Ingersoll Rand Co Rock drill mounting
GB1496568A (en) * 1974-05-07 1977-12-30 Linden Alimak Ab Drilling apparatus
US6527063B2 (en) * 2000-02-17 2003-03-04 Wendall D. Rust Directional boring device
US20100294570A1 (en) * 2008-02-20 2010-11-25 Fredrik Saf Boom arrangement for a rock drill and rock drill rig
US20110174545A1 (en) * 2010-01-15 2011-07-21 Vermeer Manufacturing Company Drilling machine and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115635536A (zh) * 2022-10-30 2023-01-24 华智源电气集团股份有限公司 一种变压器箱体多角度钻孔工具
CN115635536B (zh) * 2022-10-30 2024-04-30 华智源电气集团股份有限公司 一种变压器箱体多角度钻孔工具

Also Published As

Publication number Publication date
EP3415708B1 (fr) 2023-11-15
DE102017113247A1 (de) 2018-12-20
PL3415708T3 (pl) 2023-11-06

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