CN114700775A - Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method - Google Patents

Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method Download PDF

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Publication number
CN114700775A
CN114700775A CN202210361147.8A CN202210361147A CN114700775A CN 114700775 A CN114700775 A CN 114700775A CN 202210361147 A CN202210361147 A CN 202210361147A CN 114700775 A CN114700775 A CN 114700775A
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CN
China
Prior art keywords
paddle
pressing block
root
shape
lower pressing
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Pending
Application number
CN202210361147.8A
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Chinese (zh)
Inventor
魏秀宾
李懿
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.)
Hefei Lianhe Airplane Technology Co ltd
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Hefei Lianhe Airplane Technology Co ltd
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Application filed by Hefei Lianhe Airplane Technology Co ltd filed Critical Hefei Lianhe Airplane Technology Co ltd
Priority to CN202210361147.8A priority Critical patent/CN114700775A/en
Publication of CN114700775A publication Critical patent/CN114700775A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/02—Machine tools for performing different machining operations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Milling Processes (AREA)

Abstract

The invention discloses a fine machining fixing tool for a metal bushing of a helicopter blade root, which comprises an installation bottom plate; the bottom of the paddle root conformal lower pressing block is fixedly connected to the upper surface of the left end of the mounting bottom plate, and a groove matched with one side of a paddle root of the paddle blade to be detected in shape is formed at the top end of the paddle root conformal lower pressing block; the paddle root shape following upper pressing block is detachably and fixedly arranged at the top of the paddle root shape following lower pressing block through a first rotating bolt group, and a groove matched with the shape of the other side of the paddle root of the paddle to be detected is formed at the bottom of the paddle root shape following upper pressing block. Has the advantages that: by rotating the horizontal adjusting bolt, the horizontal position of the blade root plane can be found very conveniently, and the angle of the wing profile is ensured, so that the pneumatic effect of the blade in high-speed rotation is ensured. Simultaneously, the paddle root part is suspended, the surface of the bushing is milled by a three-edge disc milling cutter, the paddle does not need to be turned over, the finish machining of the upper plane and the lower plane can be completed at one time, and then the boring machining is completed by directly changing the knife.

Description

Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method
Technical Field
The invention relates to the technical field of helicopter blades, in particular to a fine machining fixing tool for a metal bushing of a helicopter blade root and a non-turning machining method.
Background
The paddle is an important part of a helicopter rotor system, the paddle with large size is basically molded by adopting carbon fiber composite materials at present, and the paddle root is assembled and connected with a rotating system through a metal bushing, so the processing precision of the metal bushing plays an important role in the flight performance of the helicopter.
The machining of the metal bushing comprises finish machining of the upper plane and the lower plane and finish machining of the assembly hole. The key points of the processing precision lie in the parallelism of the upper surface and the lower surface of the lining, the parallelism of the surface of the carbon fiber blade root, the verticality of the assembly hole and the upper surface and the lower surface and the control of aperture tolerance.
At first, the fine machining of the metal liner of the blade is specially configured with a set of boring machine and boring tool, and the equipment utilization rate is very low. On the basis, a fixing tool capable of being mounted and dismounted on the planer type milling machine is developed, the utilization rate of equipment is improved, and the cost is saved.
The two processing methods both need secondary positioning, namely after the blade is fixed, only the upper surface and the boring hole of the bushing can be processed, after the processing is finished, the blade needs to be turned over, and after the blade is fixed again, the lower surface and the fine boring hole are processed. Secondary fixing requires secondary propeller root horizontal adjustment, secondary boring greatly influences finish machining efficiency, and secondary positioning error accumulation can be caused, so that product precision is poor.
Disclosure of Invention
The invention aims to provide a fine machining fixing tool for a metal liner of a blade root of a helicopter blade and a non-turning machining method. Simultaneously, the paddle root part is suspended, the surface of the bushing is milled by a three-edge disc milling cutter, the paddle does not need to be turned over, the finish machining of the upper plane and the lower plane can be completed at one time, and then the boring machining is completed by directly changing the knife.
The technical scheme of the invention is realized as follows:
fixed frock of helicopter paddle root metal bush finish machining includes
Mounting a bottom plate;
the bottom of the paddle root conformal lower pressing block is fixedly connected to the upper surface of the left end of the mounting bottom plate, and a groove matched with one side of a paddle root of the paddle blade to be detected in shape is formed at the top end of the paddle root conformal lower pressing block;
the paddle root shape-following upper pressing block is detachably and fixedly arranged at the top of the paddle root shape-following lower pressing block through a first rotating bolt group, a groove matched with the shape of the other side of the paddle root of the paddle to be detected is formed at the bottom of the paddle root shape-following upper pressing block, and the groove of the paddle root shape-following lower pressing block and the groove of the paddle root shape-following upper pressing block jointly form a paddle root clamping part matched with the paddle root of the paddle to be detected;
the bottom of the paddle body shape following lower pressing block is fixedly connected to the upper surface of the right end of the mounting bottom plate, and a groove matched with one side of the paddle body of the paddle to be detected in shape is formed in the top of the paddle body shape following lower pressing block;
the paddle body conformal upper pressing block is detachably and fixedly arranged at the top of the paddle body conformal lower pressing block through a second rotating bolt group, a groove matched with the shape of the other side of the paddle body of the paddle to be detected is formed at the bottom of the paddle body conformal upper pressing block, and the groove of the paddle body conformal lower pressing block and the groove of the paddle body conformal upper pressing block jointly form a paddle body clamping part matched with the paddle body of the paddle to be detected;
the first rotating bolt group adjusts the clamping degree of the paddle root conformal lower pressing block and the paddle root conformal upper pressing block, and the second rotating bolt group adjusts the clamping degree of the paddle body conformal lower pressing block and the paddle body conformal upper pressing block;
the mounting base plate is hoisted to the table top of a T-shaped groove of the processing equipment through the hoisting rings on the surface of the mounting base plate, the reference plane of the root of the blade is adjusted to the horizontal position through the horizontal adjusting bolt group on the mounting base plate, the mounting base plate is fixed with the table top of the T-shaped groove, and a first bushing and a second bushing are arranged on the blade root of the blade to be detected.
Furthermore, the mounting base plate is hoisted to the table top of a T-shaped groove of the processing equipment through the hoisting ring on the surface of the mounting base plate, and the length edge of the mounting base plate is used as a reference to be adjusted to be parallel to the X direction of the processing equipment.
Further, the processing equipment is CNC processing or planer type milling machine.
A finish machining turning-free machining method for a metal bushing of a blade root of a helicopter comprises the following steps:
the method comprises the following steps: placing the blade body of the blade to be detected into a groove at the top of the blade body conformal lower pressing block, and placing the blade root of the blade to be detected into a groove at the top of the blade root conformal lower pressing block;
step two: the paddle body shape following upper pressing block is fixedly arranged at the top of the paddle body shape following lower pressing block through a second rotating bolt group to clamp the paddle body, and the paddle root shape following upper pressing block is fixedly arranged at the top of the paddle root shape following lower pressing block through a first rotating bolt group to clamp the paddle root;
step three: hoisting the mounting base plate to the table top of a T-shaped groove of the processing equipment through a hoisting ring, adjusting the length edge of the mounting base plate to be parallel to the X direction of the processing equipment by taking the length edge of the mounting base plate as a reference, and taking the direction as the longitudinal direction of the paddle to be detected;
step four: the upper planes of the first bushing and the second bushing on the paddle root are positively milled by the three-edge disc milling cutter installed on the processing equipment, the lower planes of the first bushing and the second bushing are reversely milled by the three-edge disc milling cutter after the milling is finished, the lower planes are changed into the assembly holes of the first bushing and the second bushing by the boring cutter, the paddle to be detected does not need to be turned over and is adjusted and positioned, and one-time clamping processing is realized.
The invention has the beneficial effects that: after the paddle to be detected is fixed on the tool, the horizontal position of the paddle root plane can be conveniently found by rotating the horizontal adjusting bolt, and the angle of the wing profile is ensured, so that the pneumatic effect of the paddle in high-speed rotation is ensured. Simultaneously, the paddle root part is suspended, the surface of the bushing is milled by a three-edge disc milling cutter, the paddle does not need to be turned over, the finish machining of the upper plane and the lower plane can be completed at one time, and then the boring machining is completed by directly changing the knife.
The method for processing the blade in place in one time without turning is used, so that the production efficiency can be improved, the equipment and labor cost can be reduced, the error accumulation of secondary clamping can be avoided, the processing precision and the qualification rate can be improved, the angle of the airfoil surface can be ensured, and the pneumatic effect of the blade in high-speed rotation can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top plan view of a helicopter blade bushing finish machining fixture mount;
FIG. 2 is a cross-sectional view at the blade bushing;
FIG. 3 is a schematic diagram of a helicopter blade bushing finish;
fig. 4 is a schematic structural view of the fixing tool.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
According to the embodiment of the invention, a fine machining fixing tool and a turning-free machining method for a metal bushing of a blade root of a helicopter are provided.
Referring to fig. 1-4, the fine machining fixing tool and the overturn-free machining method for the metal bushing of the blade root of the helicopter provided by the embodiment of the invention comprise an installation bottom plate 45;
the bottom of the paddle root shape-following lower pressing block 43 is fixedly connected to the upper surface of the left end of the mounting bottom plate 45, and a groove matched with the shape of one side of the paddle root of the paddle blade 14 to be detected is formed at the top end of the paddle root shape-following lower pressing block 43;
the paddle root shape-following upper pressing block 41 is detachably and fixedly arranged at the top of the paddle root shape-following lower pressing block 43 through a first rotating bolt group 42, a groove matched with the shape of the other side of the paddle root of the paddle 14 to be detected is formed at the bottom of the paddle root shape-following upper pressing block 41, and the groove of the paddle root shape-following lower pressing block 43 and the groove of the paddle root shape-following upper pressing block 41 jointly form a paddle root clamping part matched with the paddle root of the paddle 14 to be detected;
the bottom of the paddle body shape-following lower pressing block 49 is fixedly connected to the upper surface of the right end of the mounting bottom plate 45, and a groove matched with the shape of one side of the paddle body of the paddle 14 to be detected is formed at the top of the paddle body shape-following lower pressing block 49;
the paddle body shape-following upper pressing block 47 is detachably and fixedly arranged at the top of the paddle body shape-following lower pressing block 49 through a second rotary bolt group 48, a groove matched with the shape of the other side of the paddle body of the paddle 14 to be detected is formed at the bottom of the paddle body shape-following upper pressing block 47, and the groove of the paddle body shape-following lower pressing block 49 and the groove of the paddle body shape-following upper pressing block 47 jointly form a paddle body clamping part matched with the paddle body of the paddle 14 to be detected;
the first rotary bolt group 42 adjusts the clamping degree of the paddle root shape following lower pressing block 43 and the paddle root shape following upper pressing block 41, and the second rotary bolt group 48 adjusts the clamping degree of the paddle body shape following lower pressing block 49 and the paddle body shape following upper pressing block 47;
the mounting base plate 45 is hoisted to the table top 32 of the T-shaped groove of the processing equipment through a hoisting ring 46 on the surface of the mounting base plate 45, the reference plane 24 of the root of the blade 14 is adjusted to the horizontal position through a horizontal adjusting bolt group 44 on the mounting base plate 45, the mounting base plate 45 is fixed with the table top 32 of the T-shaped groove, and the first bushing 11 and the second bushing 12 are arranged on the root of the blade 14 to be detected.
Further, the installation bottom plate 45 is hoisted to the table surface 32 of the T-shaped groove of the processing equipment through the hoisting ring 46 on the surface of the installation bottom plate, and the installation bottom plate 45 is adjusted to be parallel to the X direction of the processing equipment by taking the length edge of the installation bottom plate 45 as a reference.
Further, the processing equipment is CNC processing or a planomiller.
A finish machining turning-free machining method for a metal bushing of a blade root of a helicopter comprises the following steps:
the method comprises the following steps: placing the blade body of the blade 14 to be detected into the groove at the top of the blade body conformal lower pressing block 49, and placing the blade root of the blade 14 to be detected into the groove at the top of the blade root conformal lower pressing block 43;
step two: the paddle body shape-following upper pressing block 47 is fixedly arranged at the top of the paddle body shape-following lower pressing block 49 through a second rotating bolt group 48 to clamp the paddle body, and the paddle root shape-following upper pressing block 41 is fixedly arranged at the top of the paddle root shape-following lower pressing block 43 through a first rotating bolt group 42 to clamp the paddle root;
step three: hoisting the mounting base plate 45 to the table surface 32 of the T-shaped groove of the processing equipment through the hoisting ring 46, adjusting the length edge of the mounting base plate 45 to be parallel to the X direction of the processing equipment by taking the length edge of the mounting base plate 45 as a reference, and taking the direction as the longitudinal direction of the paddle 14 to be detected;
step four: the three-edge disc milling cutter 32 mounted on the processing equipment positively mills the upper plane 21 of the first bushing 11 and the second bushing 12 on the paddle root, the three-edge disc milling cutter 32 is directly used for reversely milling the lower plane 22 of the first bushing 11 and the second bushing 12 after the processing is finished, the three-edge disc milling cutter is replaced with a boring cutter for processing the assembly holes 23 of the first bushing 11 and the second bushing 12, the paddle 14 to be detected does not need to be turned over and is adjusted and positioned, and one-time clamping processing is achieved.
After the paddle 14 to be detected is fixed on the tool, the horizontal position of the paddle root plane can be conveniently found by rotating the horizontal adjusting bolt 44, and the angle of the wing profile is ensured, so that the pneumatic effect of the paddle in high-speed rotation is ensured. Simultaneously, the root part of the paddle is suspended, the surface of the bush is milled by a three-edge disc milling cutter 32, the paddle 14 does not need to be turned over, the finish machining of the upper plane and the lower plane can be completed at one time, and then the boring machining is completed by directly changing the knife.
The method for processing the blade in place in one time without turning is used, so that the production efficiency can be improved, the equipment and labor cost can be reduced, the error accumulation of secondary clamping can be avoided, the processing precision and the qualification rate can be improved, the angle of the airfoil surface can be ensured, and the pneumatic effect of the blade in high-speed rotation can be ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (4)

1. Fixed frock of helicopter paddle root metal bush finish machining, its characterized in that includes
A mounting base plate (45);
the bottom of the paddle root shape-following lower pressing block (43) is fixedly connected to the upper surface of the left end of the mounting bottom plate (45), and a groove matched with the shape of one side of the paddle root of the paddle (14) to be detected is formed at the top end of the paddle root shape-following lower pressing block (43);
the paddle root shape following upper pressing block (41) is detachably and fixedly arranged at the top of the paddle root shape following lower pressing block (43) through a first rotating bolt group (42), a groove matched with the shape of the other side of the paddle root of the paddle blade (14) to be detected is formed at the bottom of the paddle root shape following upper pressing block (41), and the groove of the paddle root shape following lower pressing block (43) and the groove of the paddle root shape following upper pressing block (41) jointly form a paddle root clamping part matched with the paddle root of the paddle blade (14) to be detected;
the bottom of the paddle body shape-following lower pressing block (49) is fixedly connected to the upper surface of the right end of the mounting bottom plate (45), and a groove matched with the shape of one side of the paddle body of the paddle (14) to be detected is formed in the top of the paddle body shape-following lower pressing block (49);
the paddle body shape following upper pressing block (47) is detachably and fixedly arranged at the top of the paddle body shape following lower pressing block (49) through a second rotating bolt group (48), a groove matched with the shape of the other side of the paddle body of the paddle (14) to be detected is formed at the bottom of the paddle body shape following upper pressing block (47), and the groove of the paddle body shape following lower pressing block (49) and the groove of the paddle body shape following upper pressing block (47) jointly form a paddle body clamping part matched with the paddle body of the paddle (14) to be detected;
the first rotary bolt group (42) adjusts the clamping degree of the paddle root shape following lower pressing block (43) and the paddle root shape following upper pressing block (41), and the second rotary bolt group (48) adjusts the clamping degree of the paddle body shape following lower pressing block (49) and the paddle body shape following upper pressing block (47);
the mounting base plate (45) is hoisted to a T-shaped groove table top (32) of the processing equipment through a hoisting ring (46) on the surface of the mounting base plate, a reference plane (24) of the root of the blade (14) is adjusted to a horizontal position through a horizontal adjusting bolt group (44) on the mounting base plate (45), the mounting base plate (45) is fixed with the T-shaped groove table top (32), and a first lining (11) and a second lining (12) are arranged on the blade root of the blade (14) to be detected.
2. The fine machining fixing tool for the metal bushing of the helicopter blade root is characterized in that the mounting base plate (45) is hoisted to a T-shaped groove table top (32) of a machining device through a hoisting ring (46) on the surface of the mounting base plate, and the length edge of the mounting base plate (45) is taken as a reference, and the mounting base plate is adjusted to be parallel to the X direction of the machining device.
3. The helicopter blade root metal bushing finish machining fixing tool as claimed in claim 1 or 2, characterized in that the processing equipment is a CNC machining or a planer type milling machine.
4. A finish machining turning-free machining method for a metal bushing of a blade root of a helicopter is characterized by comprising the following steps of:
the method comprises the following steps: placing the paddle body of the paddle (14) to be detected into a groove at the top of the paddle body shape following lower pressing block (49), and placing the paddle root of the paddle (14) to be detected into a groove at the top of the paddle root shape following lower pressing block (43);
step two: the paddle body shape-following upper pressing block (47) is fixedly arranged at the top of the paddle body shape-following lower pressing block (49) through a second rotating bolt group (48) to clamp the paddle body, and the paddle root shape-following upper pressing block (41) is fixedly arranged at the top of the paddle root shape-following lower pressing block (43) through a first rotating bolt group (42) to clamp the paddle root;
step three: the mounting base plate (45) is hoisted to a T-shaped groove table top (32) of the processing equipment through a hoisting ring (46), the length edge of the mounting base plate (45) is taken as a reference, the mounting base plate is adjusted to be parallel to the X direction of the processing equipment, and the direction is taken as the longitudinal direction of the paddle (14) to be detected;
step four: the upper plane (21) of the first bushing (11) and the second bushing (12) on the paddle root is positively milled by the three-edge disc milling cutter (32) installed on the processing equipment, the lower plane (22) of the first bushing (11) and the second bushing (12) is reversely milled by the three-edge disc milling cutter (32) after the forward milling is finished, the lower plane is replaced by the assembling hole (23) of the first bushing (11) and the second bushing (12) processed by the boring cutter, the paddle (14) to be detected does not need to be overturned to be adjusted and positioned, and one-time clamping processing is achieved.
CN202210361147.8A 2022-04-07 2022-04-07 Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method Pending CN114700775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210361147.8A CN114700775A (en) 2022-04-07 2022-04-07 Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210361147.8A CN114700775A (en) 2022-04-07 2022-04-07 Finish machining fixing tool for metal bushing of helicopter blade root and turning-free machining method

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709455A (en) * 1984-03-23 1987-12-01 D'andrea S.P.A. Milling and drilling head for a machine tool
CN201279619Y (en) * 2008-09-05 2009-07-29 济南二机床集团有限公司 Milling tool capable of processing positive and negative faces
CN103386635A (en) * 2013-07-17 2013-11-13 大连理工大学 Numerical-control machining device for helicopter composite material paddle
CN107966128A (en) * 2017-12-03 2018-04-27 中国直升机设计研究所 A kind of unmanned plane composite material blade torsional angle detection device
CN108907277A (en) * 2018-06-28 2018-11-30 中国直升机设计研究所 A kind of unmanned plane composite material blade boring device and method for boring hole
CN112453963A (en) * 2020-12-03 2021-03-09 合肥联合飞机科技有限公司 Helicopter blade bore hole erection equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709455A (en) * 1984-03-23 1987-12-01 D'andrea S.P.A. Milling and drilling head for a machine tool
CN201279619Y (en) * 2008-09-05 2009-07-29 济南二机床集团有限公司 Milling tool capable of processing positive and negative faces
CN103386635A (en) * 2013-07-17 2013-11-13 大连理工大学 Numerical-control machining device for helicopter composite material paddle
CN107966128A (en) * 2017-12-03 2018-04-27 中国直升机设计研究所 A kind of unmanned plane composite material blade torsional angle detection device
CN108907277A (en) * 2018-06-28 2018-11-30 中国直升机设计研究所 A kind of unmanned plane composite material blade boring device and method for boring hole
CN112453963A (en) * 2020-12-03 2021-03-09 合肥联合飞机科技有限公司 Helicopter blade bore hole erection equipment

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