JP7299588B2 - Centering mechanism for shaft processing machine - Google Patents

Description

The present invention relates to a centering mechanism for a shaft processing machine in which a cutting tool rotates around the outer circumference of a stopped shaft.

2. Description of the Related Art As a centering jig for a lathe that cuts the outer peripheral surface of a horizontally installed shaft, one using a push screw is known.

For example, in the abstract of Patent Document 1, "a centering jig for grinding processing that has a simple configuration and is capable of performing high-precision centering in a short time" is described as "a chuck 1 for gripping an object 3 to be ground and , a centering jig for grinding processing interposed between the rotating shaft 2 that rotates the chuck 1, the chuck fixing portion 11 fixed to the chuck 1, and the chuck fixing portion 11 relative to the center line CL of the rotating shaft 2 and a runout adjusting portion 12 connected to the chuck fixing portion 11 so as to adjust the inclination angle of the rotating shaft 2, and a runout adjusting portion 12 connected to the rotating shaft 2 so as to adjust the position of the runout adjusting portion 12 in the radial direction of the rotating shaft 2. The chuck fixing part 11, the axial runout adjusting part 12, and the axial deviation adjusting part 13 are arranged from the chuck 1 toward the rotation shaft 2 so that the chuck fixing part 11 and the axial runout adjusting part 13 are fixed to the chuck 1. A centering jig for grinding is disclosed in which the portion 12 and the misalignment adjusting portion 13 are arranged in this order. 2 and 7B of the same document disclose a configuration for adjusting the tilt angle of the chuck fixing portion 11 using the tilt adjusting bolt 124 as a specific example of the surface runout adjusting portion 12. It is

That is, the centering jig for grinding processing disclosed in Patent Document 1 rotates the object to be ground by connecting a chuck holding the object to be ground and a rotating shaft. It is possible to adjust the relative tilt angle of the rotating shaft with a single jig.

JP 2011-56596 A

However, since the centering jig for grinding of Patent Document 1 is premised on a processing machine that rotates the object to be ground, it cannot be applied to a processing machine in which the cutting tool rotates around the outer circumference of the stopped object to be ground. In addition, since a jig is interposed between the tilt adjustment bolt and the grinding object, and the tilt adjustment bolt and the grinding object do not come into direct contact with each other, the processing machine is assumed to have a configuration. There is a problem in that it cannot be applied to a processing machine in which objects are in direct contact with each other in various ways.

Therefore, the present invention achieves simple and highly accurate centering in a shaft processing machine in which a cutting tool rotates around the outer periphery of a stopped object to be ground, and in which there are various contact modes between the tilt adjustment bolt and the object to be ground. It is an object of the present invention to provide a centering mechanism.

A centering mechanism for a shaft processing machine for cutting the outer peripheral surface of a generator shaft having a radially extending shaft arm at its end, wherein the shaft processing machine is installed on the shaft arm side of the generator shaft. a driven-side bearing installed on the tip side of the generator shaft; a connecting arm connecting the driven-side bearing and the driving-side bearing; a cutting portion attached to the connecting arm; a drive unit for generating a driving force to rotate the connecting arm along the outer periphery of the generator shaft, and the centering mechanism includes the shaft arm and the chuck claws of the driven side bearing facing each other. a first jig attached to the chuck claw and a first bolt passing through both the first jig and the shaft arm, and the first bolt is screwed forward or backward. Thus, a centering mechanism for a shaft processing machine that adjusts the mounting angle of the driven side bearing with respect to the generator shaft.

According to the present invention, a cutting tool rotates around the outer periphery of a stopped object to be ground, and simple and highly accurate centering is achieved in a shaft processing machine in which there are various contact modes between the tilt adjusting bolt and the object to be ground. A centering mechanism can be provided.

Schematic cross section of a large wind turbine Perspective view of the shaft processing machine attached to the generator shaft Perspective view showing the shape and mounting position of the first and second jigs of the centering mechanism Cross-sectional view of the centering mechanism of the driven side bearing attached to the generator shaft Cross-sectional view of the centering mechanism of the driven side bearing attached to the generator shaft

A centering mechanism for a shaft processing machine according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.

FIG. 1 is a schematic cross-sectional view of a large wind power generator 10 to which the centering mechanism of this embodiment is applied. This large-scale wind power generator 10 is, for example, a wind power generator with a tower height of about 70 m and a power generation capacity of 2000 kW class. A propeller 3 is attached to the front of the nacelle 2. Although the inclination angle of the nacelle 2 with respect to the horizontal is 8° in FIG. 1, the inclination angle may be 6° to 10°, or the nacelle 2 may be installed horizontally.

Inside the nacelle 2 is installed a generator 4 that converts rotational force into electric power, and a propeller shaft 5, a gearbox 6, and a relay are provided to connect the propeller 3, which is rotated by the wind, to the generator 4. Devices such as a shaft 7, a coupling 8, a generator shaft 9, etc. are installed. The gearbox 6 is a transmission that accelerates the rotation of the propeller shaft 5 that interlocks with the propeller 3 and transmits it to the relay shaft 7 on the generator 4 side. The coupling 8 is a connecting member that normally connects the relay shaft 7 and the generator shaft 9 and separates the two shafts during maintenance of the generator 4 and the gear box 6, for example.

When performing maintenance on the internal equipment of the nacelle 2, it is conceivable to lower the nacelle 2 from the top of the tower 1 onto a flat ground, perform maintenance on the internal equipment in the horizontal nacelle 2, and then return the nacelle 2 to the top of the tower 1. Since the vertical movement of the nacelle 2 requires a high work cost and a long work time, it is usually necessary to move the internal equipment without lowering the nacelle 2 to the level ground (that is, inside the inclined nacelle 2 on the tower 1). Maintenance is often done.

Maintenance of the outer peripheral surface of the generator shaft 9 is typical maintenance of internal equipment. This is maintenance of cutting the deteriorated outer peripheral surface to a thickness of several millimeters when the outer peripheral surface of the generator shaft 9 deteriorates due to rust or the like. Normally, a lathe is used for cutting the outer peripheral surface of the shaft, but as is clear from FIG. Since there is no space for installing a lathe, in this embodiment, the outer peripheral surface of the generator shaft 9 is maintained using a relatively small shaft processing machine 20 that can be installed in the space where the coupling 8 is removed.

FIG. 2 is a perspective view of the shaft processing machine 20 attached to the generator shaft 9. FIG. The generator shaft 9 in the figure is separated from the relay shaft 7 and connected to the rotor of the generator 4. The left direction is the tip side (free end side) where the coupling 8 was attached, and the right direction. is the generator 4 side (fixed end side). Six shaft arms 9 a extend radially from the end of the generator shaft 9 on the generator 4 side, and the generator 4 includes these shaft arms 9 a.

This shaft processing machine 20 is a processing machine for cutting the outer peripheral surface of the generator shaft 9 with a cutting tool that rotates around the outer periphery of the stopped generator shaft 9. A connecting arm 23 , a cutting portion 24 , a counterweight 25 and a driving portion 26 are provided. More specifically, a driving side bearing 21 is attached to the tip side of the generator shaft 9, a driven side bearing 22 is attached to the generator 4 side, and both bearings are connected by a plurality of connecting arms 23. . A cutting portion 24 capable of adjusting the axial and radial positions of the cutting tool is attached to one of the connecting arms 23, and a counterweight for balancing the cutting portion 24 is attached to the other connecting arm 23. 25 is attached.

In each of the driving side bearing 21 and the driven side bearing 22, chuck portions 21a and 22a for gripping the generator shaft 9 with four chuck claws are arranged on the inner peripheral side, and chuck portions 21a and 22a are arranged on the outer peripheral side. Rotating parts 21b and 22b are arranged to rotate coaxially with. When the rotating portion 21b of the driving side bearing 21 is rotated by the driving portion 26, the connecting arm 23 connected to the rotating portions 21b and 22b rotates around the generator shaft 9 in conjunction with this rotation, and the cutting portion By moving the cutting tools 24 to desired positions, the outer peripheral surface of the generator shaft 9 can be sequentially cut.

Here, as illustrated in FIG. 1, the nacelle 2 of this embodiment is inclined at 8° with respect to the horizontal, so the generator shaft 9 installed inside the nacelle 2 is also inclined. When the generator shaft 9 is tilted, the generator shaft 9 tends to fall horizontally due to gravity, which tends to make the centering of the shaft processing machine 20 more difficult than when it is horizontal. If cutting is performed with poor centering accuracy, there is a high possibility that the relative inclination angle with respect to the other shafts (propeller shaft 5 and relay shaft 7) will change after the generator shaft 9 is cut. In addition, in this embodiment, the chuck portion 22a of the driven side bearing 22 is supported at four points, whereas the generator shaft 9 has six shaft arms 9a. There are various states, and if it is attempted to equally install the tilt adjustment bolts at any position, it is necessary to change the form of the centering mechanism 30 depending on the position. Therefore, in this embodiment, by using the centering mechanism 30 (the first jig 31, the second jig 32, the pull bolt 33, and the push bolt 34) described with reference to FIGS. Easy and highly accurate centering can be performed even at the bottom.

FIG. 3 is a perspective view showing the shapes and mounting positions of the first jig 31 and the second jig 32 that constitute the centering mechanism 30 of this embodiment. As shown here, at the position where the shaft arm 9a and the chuck claws of the chuck portion 22a face each other (horizontal plane including point O and arrow A in FIG. 2), a substantially U-shaped cross-sectional shape is formed on the side surface of the generator 4 of the chuck claws. The first jig 31 is attached, and at a position where the shaft arm 9a and the chuck claws do not face each other (the vertical plane including the point O and the arrow B in FIG. 2), the first jig is attached to the side surface of the generator 4 of the chuck claws. A tool 31 is attached, and a substantially fan-shaped second tool 32 that bridges the two shaft arms 9a is attached.

4 is a cross-sectional view illustrating the structure of the centering mechanism 30 in the horizontal plane of FIG. 2. FIG. As shown here, a push bolt 34 (tilt adjustment bolt) that penetrates the inner peripheral side of the chuck claw is provided at a position where the shaft arm 9a and the chuck claw face each other. The mounting angle of the driven side bearing 22 with respect to the generator shaft 9 can be adjusted by pressing against the inclined portion. Further, a pull bolt 33 (tilt adjustment bolt) is provided that penetrates both the shaft arm 9a and the first jig 31, and the driven side bearing for the generator shaft 9 can also be adjusted by screwing it forward or backward. 22 mounting angle can be fine-tuned in both directions.

5 is a cross-sectional view illustrating the structure of the centering mechanism 30 in the vertical plane of FIG. 2. FIG. As shown here, push bolts 34 (bolts for tilt adjustment) that pass through the inner peripheral side of the chuck claws are also provided at positions where the shaft arm 9a and the chuck claws do not face each other. The mounting angle of the driven side bearing 22 with respect to the generator shaft 9 can be adjusted as in FIG. 4 by pressing the second jig 32 bridging the 9a. Further, a pull bolt 33 (tilt adjustment bolt) is provided to pass through both the first jig 31 and the second jig 32, and by screwing or retreating the pull bolt 33, similar to FIG. The mounting angle of the driven side bearing 22 with respect to the generator shaft 9 can be finely adjusted in both directions.

4 and 5, the pull bolt 33 and the push bolt 34 are, for example, M12 bolts, and it is assumed that an L-shaped wrench is used for screwing and unscrewing these bolts. , the diameter of the bolt is not limited to M12, and the bolt may be screwed using other tools.

As described above, according to the centering mechanism of this embodiment, the cutting tool rotates on the outer periphery of the stopped generator shaft, and the end of the generator shaft (shaft arm) and the chuck portion of the driven side bearing are separated. In a shaft processing machine with various relative modes, tilt adjustment bolts can be equally arranged for any chuck jaws, and not only push bolts but also pull bolts can be used as tilt adjustment bolts. Therefore, regardless of whether or not the generator shaft is inclined, it is possible to perform simple and highly accurate centering.

10 large wind power generator,
1 tower,
2 nacelle,
3 propellers,
4 generator,
5 propeller shaft,
6 gearbox,
7 relay shaft,
8 coupling,
9 generator shaft,
9a shaft arm,
20 shaft processing machine 21 drive side bearing,
21a chuck part,
21b rotating part,
22 driven side bearing,
22a chuck part,
22b rotating part,
23 connecting arm,
24 cutting part,
25 counterweight,
26 drive,
30 centering mechanism 31 first jig,
32 second jig,
33 pull bolt,
34 push bolt

Claims (4)

A centering mechanism for a shaft processing machine for cutting the outer peripheral surface of a generator shaft having a radially extending shaft arm at its end, comprising:
The shaft processing machine is
a driven side bearing installed on the shaft arm side of the generator shaft;
a drive-side bearing installed on the tip side of the generator shaft;
a connecting arm that connects the driven side bearing and the driving side bearing;
a cutting portion attached to the connecting arm;
a driving unit that generates a driving force that rotates the connecting arm along the outer circumference of the generator shaft,
The centering mechanism is
At a position where the shaft arm and the chuck claw of the driven side bearing face each other,
a first jig attached to the chuck claw;
a first bolt passing through both the first jig and the shaft arm;
A centering mechanism for a shaft processing machine, wherein a mounting angle of the driven side bearing with respect to the generator shaft is adjusted by screwing or retreating the first bolt. In the centering mechanism for a shaft processing machine according to claim 1,
The centering mechanism is
At a position where the shaft arm and the chuck claws of the driven side bearing do not face each other,
a first jig attached to the chuck claw;
a second jig that bridges the two shaft arms;
a first bolt passing through both the first jig and the second jig;
A centering mechanism for a shaft processing machine, wherein a mounting angle of the driven side bearing with respect to the generator shaft is adjusted by screwing or retreating the first bolt. In the centering mechanism for a shaft processing machine according to claim 2,
The centering mechanism is
At a position where the shaft arm and the chuck claw face each other, a second bolt passing through the chuck claw is tightened to press the second bolt against the shaft arm, thereby attaching the driven side bearing to the generator shaft. adjust the angle and
At a position where the shaft arm and the chuck claw do not face each other, by tightening a second bolt penetrating the chuck claw, the second bolt is pressed against the second jig, and the driven side bearing for the generator shaft is mounted. A centering mechanism for a shaft processing machine, characterized in that it adjusts the mounting angle of the In the centering mechanism for a shaft processing machine according to any one of claims 1 to 3,
The number of shaft arms is greater than the number of chuck claws of the driven side bearing,
A centering mechanism for a shaft processing machine, wherein the shaft arms are radially arranged at the ends of the generator shaft.

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