JP3852046B2 - Rotating shaft coupling mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary shaft coupling mechanism for coupling and driving a rotary shaft such as a rolling roll of a rolling mill.
[0002]
[Prior art]
A rolling roll of the rolling mill is connected to a motor via a universal joint and is rotated by a driving force of the motor. However, since the roll surface is worn with use, the roll needs to be replaced as appropriate. Therefore, as shown in FIGS. 5 and 6, a cylindrical roll coupling 2 is provided on one end side of the universal joint, and an oval connection with an oval cross section formed at the shaft end of the rolling roll 1. The portion 1a is fitted into an oval inner hole 2a having an oval cross section formed in the roll coupling 2. Since the oval inner hole 2a of the roll coupling 2 is formed to be slightly larger than the oval connecting portion 1a of the rolling roll 1, the oval connecting portion 1a can be easily attached and detached when the rolling roll 1 is replaced. Can do. Further, since the oval connecting portion 1a is fitted into the oval inner hole 2a having an oval cross section, the flat portions 2b and 1b are engaged with each other, and the rotational torque from the roll coupling 2 side is reduced to the rolling roll. 1 can be surely communicated.
[0003]
However, since there is a gap for attachment and detachment between the oval inner hole 2a of the roll coupling 2 and the oval connecting portion 1a of the rolling roll 1, if the rolling operation is performed as it is, the rolling roll 1 There is a risk that wobbling or the like may occur on the surface of the rolled product due to vibration caused by rattling during rotation. For this reason, conventionally, the roll coupling 2 is externally fitted with a sleeve 3 with a hydraulic expansion chamber on the outer periphery of the cylinder, and the oval inner hole 2a is contracted by the compression of the sleeve 3 with the hydraulic expansion chamber. The backlash of the rolling roll 1 is eliminated by pressing and fixing the connecting portion 1a.
[0004]
The sleeve 3 with a hydraulic expansion chamber is formed with a hydraulic expansion chamber 3a formed of a thin cylindrical space over the entire circumference in a portion very close to the inner peripheral surface of the cylindrical steel material, and is open to the outer peripheral surface. By applying a high hydraulic pressure from the hydraulic port 3b, the expansion plate 3c covering the inner peripheral side of the hydraulic expansion chamber 3a is bent inward by the hydraulic pressure so that the diameter of the inner peripheral surface can be contracted. is there. Such a sleeve 3 with a hydraulic expansion chamber is formed by inserting a very thin cylindrical body having a small diameter on the inner periphery of a cylindrical main body so that the gaps are equal, and sealing the openings at both ends by welding. Manufactured.
[0005]
[Problems to be solved by the invention]
However, as shown in FIG. 7, when the hydraulic expansion chamber 3a expands and the diameter of the inner peripheral surface of the expansion plate 3c contracts as a whole, the sleeve 3 with the hydraulic expansion chamber equalizes the outer peripheral surface of the roll coupling 2. Will be pressed. However, the cylindrical roll coupling 2 has an outer peripheral surface that is circumferential, but the inner peripheral surface is formed with an oval inner hole 2a having an oval cross section. The wall thickness at both planar portions 2b is particularly thicker than the circumferential portion. Therefore, when the outer periphery of the roll coupling 2 having a non-uniform thickness is pressed evenly, the oblong inner hole 2a has both the thick and highly rigid flat portions 2b as shown in FIG. Therefore, the circumferentially thin portion having a small thickness and low rigidity tends to be deformed so as to bulge outward.
[0006]
For this reason, the oval connecting portion 1a of the rolling roll 1 is securely sandwiched between the two flat surface portions 2b of the oval inner hole 2a of the roll coupling 2 with respect to the two flat surface portions 1b. The circumferential portion of the portion 1a is not sufficiently clamped by the circumferential portion of the oval inner hole 2a, and in some cases, a gap is generated here, so that the rolling roll 1 is circumferentially connected to the oval connecting portion 1a during the rolling operation. There was a problem that there was a risk of rattling in the direction.
[0007]
In addition, by forming grooves 2d as shown in FIG. 18 or slits or the like on both flat surface portions 2b of the oval inner hole 2a of the roll coupling 2, a rolling roll is formed by weakening the rigidity of this portion. An invention for securely holding one oval connecting portion 1a has also been made (Patent Publication No. 2694683). However, even in such a configuration, the thickness of the two flat portions 2b of the oval inner hole 2a is still thick in a portion where there is no groove 2d, slits, or the like. However, the problem that the compression force at the circumference is weak cannot be solved sufficiently. In addition, when the sleeve 3 with the hydraulic expansion chamber presses the outer peripheral surface of the roll coupling 2, stress is easily concentrated on the edge of the groove 2d and the slit, so that only these edge portions are in the oval connecting portion 1a. There is also a problem that it is pinched by point contact or line contact and cannot be securely pinched by surface contact of the flat surface portion 2b.
[0008]
The present invention has been made in view of such circumstances, and by making the inner peripheral surface of the sleeve with the hydraulic expansion chamber into an oval cross-sectional shape, the oval inner hole of the cylindrical portion of the connected member is uniformly contracted. It is an object of the present invention to provide a rotating shaft connecting mechanism that can securely press the oval connecting portion of the rotating shaft.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an oval connecting portion at a shaft end portion of a rotating shaft formed in a cross-sectional oval shape in which both sides of a circumferential outer peripheral surface are scraped by planes substantially parallel to each other along an axis. The hydraulic pressure is inserted into the oval inner hole of the cylindrical portion of the connected member formed in the oval shape having a slightly larger cross section than the oval connecting portion, and is externally fitted to the outer periphery of the cylindrical portion of the connected member. By expanding the hydraulic expansion chamber in the sleeve with the expansion chamber by applying hydraulic pressure, the inner peripheral diameter of the expansion plate with a substantially uniform thin plate covering the inner peripheral side of the hydraulic expansion chamber is contracted to the whole, thereby forming a tubular shape. In the rotating shaft coupling mechanism that presses the portion and presses and fixes the oval inner hole to the oval connecting portion of the rotating shaft, the outer peripheral surface of the cylindrical portion of the connected member is made to be larger than the circumferential portion of the oval inner hole. Concentric with a large diameter, and formed in a cross-sectional oval shape with a flat part almost parallel to the flat part of the oval bore. In addition, the expansion plate of the sleeve with the hydraulic expansion chamber is formed in an oblong cross section whose inner peripheral surface is slightly larger than the outer peripheral surface of the tubular portion of the connected member. A cross-sectional arcuate spacer having a circumferential surface formed on the outer circumferential surface is inserted between the circumferential outer circumferential surface in the hydraulic expansion chamber.
[0010]
According to the first aspect of the present invention, when hydraulic pressure is applied to the hydraulic expansion chamber of the sleeve with the hydraulic expansion chamber, the expansion plate is bent toward the inner peripheral side by the hydraulic pressure and contracts the inner peripheral surface. However, the outer peripheral surface of the hydraulic expansion chamber has a circular shape, but the expansion plate has an oblong cross section, so the hydraulic expansion chamber on the outer peripheral side of the flat portion of this expansion plate has a larger space, May be irregularly bent toward the inner peripheral side. However, since a spacer is inserted into the wide space of the hydraulic expansion chamber, the spacer can evenly press the flat portion of the expansion plate toward the inner peripheral side by the hydraulic pressure. In addition, the oil that wraps around the inner peripheral side of the spacer may directly press the flat portion of the expansion plate. Even in this case, the expansion plate is irregularly bent by the inner peripheral surface of the spacer. Can be prevented. Therefore, in the sleeve with the hydraulic expansion chamber, the inner peripheral surface of the expansion plate having the oblong cross-sectional shape uniformly presses the entire outer peripheral surface of the cylindrical portion having the same oblong cross-sectional shape. Because the circumference and flat part of the plate are almost evenly compressed, and the wall thickness can be made almost equal, the oval bore is shrunk almost evenly to make the oval joint of the rotating shaft uniform. It becomes possible to press contact with.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
1 to 4 show an embodiment of the present invention. FIG. 1 is a cross-sectional side view showing a configuration of a rotating shaft coupling mechanism of a rolling mill, and FIG. 2 is a configuration of a rotating shaft coupling mechanism of the rolling mill. FIG. 3 is a perspective view showing a configuration of a roll coupling, and FIG. 4 is a perspective view showing a configuration of a sleeve with a hydraulic expansion chamber. In addition, the same number is attached | subjected to the structural member which has the function similar to the prior art example shown in FIGS.
[0013]
In the present embodiment, as shown in FIGS. 1 and 2, a rotating shaft coupling mechanism for coupling a rolling roll 1 of a rolling mill similar to the conventional example to a roll coupling 2 will be described. At the shaft end portion of the rolling roll 1, an oval connecting portion 1a having an oval cross section is formed as in the conventional example. The cross-sectional oblong shape refers to a shape in which both sides of the circumferential outer peripheral surface of the shaft body are scraped by planes that are substantially parallel to each other along the axis, and each portion of the outer peripheral surface that is scraped by the plane is a flat portion. And the remaining part becomes the circumferential part. Usually, these flat portions are equidistant from the axis and have a symmetrical shape. However, in the case of a hole having an oblong cross section, the hole shape is such that the outer peripheral surface of the shaft body is fitted without a gap.
[0014]
The roll coupling 2 is a cylindrical portion for connecting the rolling roll 1 formed at one end of the universal joint. As shown in FIG. A hole 2a is formed. The oval inner hole 2a is a hole formed in a cross sectional oval shape slightly larger than the oval connecting portion 1a of the rolling roll 1, that is, a substantially uniform small gap between the outer periphery of the oval connecting portion 1a. This is a hole having an oblong cross section such that is formed. Further, as shown in FIG. 1, the outer peripheral surface of the roll coupling 2 is formed in a cross-sectional oblong shape concentric with the oblong inner hole 2a. Accordingly, the outer peripheral surface of the roll coupling 2 is concentric with the circumferential portion of the oval inner hole 2a, the circumferential portion of the circumferential surface having a larger diameter, and the flat portion of the oval inner hole 2a. It has a flat surface portion 2c parallel to 2b. Further, the cross-sectional oblong shape of the outer peripheral surface of the roll coupling 2 is formed to be substantially similar to the oblong inner hole 2a so that the cylindrical wall thickness becomes equal.
[0015]
As shown in FIGS. 1 and 2, a sleeve 3 with a hydraulic expansion chamber is fitted on the outer periphery of the roll coupling 2. As in the conventional example, the hydraulic expansion chamber-equipped sleeve 3 has a hydraulic expansion chamber 3a formed therein, but the inner peripheral surface is formed in an oblong cross section that is slightly larger than the outer peripheral surface of the roll coupling 2. Yes. That is, the outer peripheral surface in the hydraulic expansion chamber 3a forms a circumferential surface, and a hole communicating with the hydraulic port 3b is opened. However, an expansion plate 3c that covers the inner peripheral side of the hydraulic expansion chamber 3a is formed in an oblong cross section. The expansion plate 3c is formed by forming a thin steel plate having substantially the same thickness into a cylindrical shape having an oblong cross section. The expansion plate 3c is inserted into the inner periphery of the main body of the cylindrical sleeve 3 with a hydraulic expansion chamber, and the openings at both ends are formed. The gap is sealed with an arcuate steel plate and the gap is sealed by welding.
[0016]
As shown in FIG. 4, the sleeve 3 with the hydraulic expansion chamber is formed with a wide space between the outer peripheral surface of the flat portion of the expansion plate 3c and the circumferential outer surface of the hydraulic expansion chamber 3a. . In each of these spaces, the expansion plate 3c is sealed after inserting the spacers 4 respectively. The spacer 4 has a cross-sectional arc shape in which a circumferential surface along the outer peripheral surface in the hydraulic expansion chamber 3a is formed on the outer peripheral surface, and fits in a space between the flat portion of the expansion plate 3c with almost no gap. It comes to include.
[0017]
In the rotary shaft coupling mechanism having the above configuration, first, the oval coupling portion 1 a at the shaft end of the rolling roll 1 is inserted into the oval inner hole 2 a of the roll coupling 2. In this case, the oval inner hole 2a is formed slightly larger than the oval connecting portion 1a, so that it can be easily inserted. Next, high pressure oil pressure is applied to the hydraulic port 3b of the sleeve 3 with the hydraulic expansion chamber to expand the hydraulic expansion chamber 3a, and the inner peripheral surface is contracted by bending the expansion plate 3c evenly toward the inner peripheral side. Here, if the spacer 4 is not inserted into the hydraulic expansion chamber 3a, a space that is much wider than the outer peripheral side of the circumferential portion is formed on the outer peripheral side of the flat portion of the expansion plate 3c. When high pressure is applied by injecting oil into the hydraulic expansion chamber 3a, the expansion plate 3c made of a thin steel plate bends irregularly by the hydraulic pressure of a flat portion having a large space, and the inner peripheral surface contracts evenly. There is a risk of not. However, as in the present embodiment, when the spacer 4 having an arcuate cross section is inserted, the plane on the inner peripheral side of the spacer 4 presses the plane portion of the expansion plate 3c evenly by hydraulic pressure, and the hydraulic pressure is increased. Even if the expansion plate 3c is pressed directly, there is no possibility of irregular bending by following the inner peripheral plane of the spacer 4.
[0018]
As described above, when the inner peripheral surface of the cross-sectional oval shape of the expansion plate 3c in the sleeve 3 with the hydraulic expansion chamber is evenly contracted, the outer peripheral surface of the cross-sectional oval shape of the roll coupling 2 is uniformly compressed as a whole. The And since the wall thickness between the cross-sectional oval shape of the outer peripheral surface of this roll coupling 2 and the oval inner hole 2a is substantially equal over the whole circumference, the oval inner hole 2a is also compressed equally. . For this reason, the roll coupling 2 can shrink the oval inner hole 2a evenly, uniformly press-contact the outer peripheral surface of the oval connecting portion 1a of the rolling roll 1, and securely fix it.
[0019]
As described above, according to this embodiment, the inner peripheral surface of the cross-sectional oval shape of the sleeve 3 with the hydraulic expansion chamber equally presses the roll coupling 2 having the same oval cross-sectional shape and the same wall thickness. The oval inner hole 2a of the roll coupling 2 can uniformly press and fix the outer peripheral surface of the oval connecting portion 1a of the rolling roll 1, and a strong radial force is applied to the rolling roll 1 during the rolling operation. In this case, backlash between the roll coupling 2 and the roll coupling 2 can be prevented.
[0020]
In the above-described embodiment, the rotating shaft connecting mechanism that connects the rolling roll 1 of the rolling mill to the roll coupling 2 has been described. However, the rotating shaft connecting mechanism that connects other rotating shafts can be similarly implemented. .
[0021]
【The invention's effect】
As is clear from the above description, according to the rotary shaft coupling mechanism of the present invention, the inner peripheral surface of the cross-sectional oblong shape of the expansion plate in the sleeve with the hydraulic expansion chamber is deflated uniformly with the help of the spacer. The oval inner hole can be securely pressed and fixed to the oval connecting portion of the rotary shaft through the outer peripheral surface of the oval cross section of the shaped portion.
[Brief description of the drawings]
FIG. 1, showing an embodiment of the present invention, is a cross-sectional side view showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
FIG. 2, showing an embodiment of the present invention, is a longitudinal sectional front view showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
FIG. 3 is a perspective view showing a configuration of a roll coupling according to an embodiment of the present invention.
FIG. 4 is a longitudinal sectional perspective view showing a configuration of a sleeve with a hydraulic expansion chamber according to an embodiment of the present invention.
FIG. 5 is a longitudinal sectional perspective view showing a configuration of a rotary shaft coupling mechanism of a rolling mill, showing a conventional example.
FIG. 6 is a longitudinal sectional front view showing a configuration of a rotary shaft coupling mechanism of a rolling mill, showing a conventional example.
FIG. 7 is a cross-sectional side view showing a configuration of a rotary shaft coupling mechanism of a rolling mill, showing a conventional example.
FIG. 8 is a side view showing a conventional example and showing a state of deformation of a roll coupling.
FIG. 9 shows another conventional example and is a cross-sectional side view showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll 1a Oval connection part 1b Plane part 2 Roll coupling 2a Oval inner hole 2b Plane part 2c Plane part 3 Sleeve 3a with hydraulic expansion chamber Hydraulic expansion chamber 3c Expansion plate 4 Spacer

Claims (1)

The oval connecting part at the shaft end of the rotating shaft formed in a cross-sectional oval shape with both sides of the circumferential outer surface cut off by planes substantially parallel to each other along the axis is from this oval connecting part. The hydraulic pressure in the sleeve with the hydraulic expansion chamber inserted into the outer periphery of the cylindrical portion of the coupled member inserted into the cylindrical portion of the cylindrical portion of the coupled member formed in a slightly larger cross-sectional oblong shape By applying hydraulic pressure to the expansion chamber and expanding it, the inner diameter of the expansion plate with an almost uniform thin plate covering the inner peripheral side of this hydraulic expansion chamber is contracted to the whole, thereby compressing the cylindrical part and making it oval In the rotating shaft coupling mechanism that presses and fixes the inner hole to the oval coupling portion of the rotating shaft,
Cross section provided with a flat surface that is concentric with the outer peripheral surface of the cylindrical portion of the connected member having a larger diameter than the peripheral portion of the oval inner hole and substantially parallel to the flat portion of the oval inner hole While forming into an oval shape,
The expansion plate of the sleeve with the hydraulic expansion chamber is formed in an oval cross-sectional shape whose inner peripheral surface is slightly larger than the outer peripheral surface of the tubular portion of the connected member. A rotary shaft coupling mechanism, wherein a spacer having an arcuate cross section having a circumferential surface formed on the outer circumferential surface is inserted between each of the circumferential outer circumferential surfaces.

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