JP3704888B2 - Electric motor for hot roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot roll electric motor that is inexpensive and capable of high-speed operation.
[0002]
[Prior art]
Conventionally, an electric motor for hot rolls has a configuration shown in FIG. As can be seen from FIG. 4, the electric motor body 1 includes a shaft 2, a rotor core 3 that rotates the shaft 2, a stator core 4, a stator yoke 5, and brackets 6, 7. 5. The motor is supported and fixed by supporting the brackets 6 and 7.
[0003]
In this case, the hot roll electric motor has a shape in which the load-side bracket 7 has a so-called long protruding nose, and thus the shaft 2 is also formed long, and a heater 8 is formed outside the protruding bracket 7. There is a roll 9 that is attached to the end of the shaft 2 and rotates integrally with the outside of the heater 8. As the roll 9 rotates at a high speed in a high temperature environment, a supply / discharge passage 11 for lubricating oil (oil mist) reaching the bearing 10 is formed in communication with the anti-load side bracket 6. Further, a supply / discharge passage 13 for lubricating oil (oil mist) reaching the bearing 12 at the tip thereof is also formed in communication with the load side bracket 7.
[0004]
[Problems to be solved by the invention]
The hot roll motor is configured as described above, but has the following problems. The roll 9 of the hot roll has a large weight and needs to rotate at a high speed. However, it has a low natural frequency, which is a detrimental effect of high speed, and the long distance between the bearings 10 and 12 of the long shaft 2 is also inherent. This is the cause of lowering the frequency.
[0005]
The bearings 10 and 12 are located at both ends of the long shaft 2, and the bearing 12 on the roll 9 side in particular has a large load for supporting the roll load and is exposed to high temperatures, so its life is extremely short and the diameter dimension is limited. There is also a restriction that large bearings cannot be used. In this case, in order to extend the life of the bearing as much as possible, it is conceivable to cool the bearing, for example, by blowing compressed air from the outside or by blowing air with a cooling fan from the non-load side of the motor, By adopting a heat insulating cylinder, or trying to cool by providing a blade between the bearing 12 and the roll 9 to create wind, blowing compressed air takes a running cost, and blowing a cooling fan Since the distance to the bearing is long and the cooling effect is thin, the heat insulating cylinder itself does not provide effective cooling, and the introduction of blades reduces the natural frequency.
In any case, it is not a fundamental solution.
[0006]
The motor bracket 7 on the load side is integrally formed with a support for a heavy roll 9, a lubricating oil supply / discharge passage 13, a fixing flange for the heater 8, and a unique shape. It has an expensive and complicated structure.
[0007]
As a result, the bearing span is too long, the position of the motor leg and the bearing is too far at a single location on the load side, and a large addition is added to one of the bearings, and the bracket is complicated and expensive. There is a problem of being.
[0008]
An object of the present invention is to provide an electric motor for a hot roll that solves the above-described problems, shortens the bearing span as much as possible, reduces the load on the bearing, and simplifies the bracket.
[0009]
[Means for Solving the Problems]
The present invention that achieves the above object has the following invention-specific matters.
(1) Mount the motor body on one side of the mounting scale and mount the roll mounting body on the other side. Mount the roll on the tip of the shaft that penetrates the roll mounting body and connects to the shaft of the motor body and supports it with a bearing. A bearing for supporting the shaft is also provided in the vicinity of the mounting scale.
(2) In the above (1), the shaft of the electric motor main body and the shaft of the roll attachment body are formed as an integral shaft.
(3) In the above (1), two or more bearings for supporting the shaft are provided in the roll mounting body.
(4) In the above (1), the shaft of the electric motor body and the shaft of the roll mounting body are formed as an integral shaft, and two or more bearings for supporting the shaft are provided in the roll mounting body, and at the opposite side of the electric motor body Is also provided with a bearing.
(5) In the above (2), the middle portion of the shaft that hits the mounting scale is narrowed, and an O-ring is attached to a bearing provided on the motor body side.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Here, an example of an embodiment of the present invention will be described with reference to FIGS. 1 to 3, the same parts as those in FIG. FIG. 1 shows a split-type hot roll motor, which has a split assembly structure including a motor body 1, a mounting scale 20, a roll mounting body 21, a heater 8 and a roll 9.
[0011]
The electric motor main body 1 is provided with lubricating oil supply / discharge passages 11 and 13 inside the brackets 6 and 7 together with an inlet / outlet, and a shaft 2a is rotatably attached to the brackets 6 and 7 via bearings 10a and 10b. It has been. The supply / discharge passage 11 allows oil mist to pass through the bearing 10 a in the bracket 6, and the supply / discharge passage 13 allows oil mist to pass through the bearing 10 b in the bracket 7.
[0012]
The load side bracket 7 of the electric motor main body 1 is attached to and supported by the attachment scale 20. The mounting scale 20 is an L-shaped structure that supports the entire hot roll electric motor. The bracket 7 of the electric motor body 1 is fixed to the left side surface in the drawing, and the left side of the roll mounting body 21 is mounted and supported on the right side surface. The The roll mounting body 21 supports the shaft 2b via the bearings 12a and 12b, and the lubricating oil supply / discharge passage 13 passes through the roll mounting body 21, and the roll 9 is mounted and fixed at the tip thereof.
[0013]
As described above, the mounting scale 20 supports the electric motor body 1 and the roll mounting body 21, and further has a coupling 22 inside thereof, and the shaft 2 a of the electric motor body 1 and the mounting body 21. The shaft 2 b is connected, and has a passage that communicates the supply / discharge passage 13 of the bracket 7 with the supply / discharge passage 13 inside the roll mounting body 21.
As a result, the load applied to the bearing by the roll becomes a structure in which the shaft 2b is supported on the roll mounting body 21 by the bearings 12a and 12b by the mounting scale 20 that supports the electric motor main body 1 and the roll mounting body 21 separately. The bracket 7 of the electric motor body 1 itself has a simple structure.
[0014]
FIG. 2 shows a structure in which the shaft 2 is integrated and the electric motor body 1, the mounting scale 20, and the roll mounting body 21 are divided. In the structure of FIG. 2, one shaft 2 is supported by bearings 10 and 12 at two places, a mounting scale 20 and a tip of a roll mounting body 21 attached thereto. The rotor core 3 of the electric motor body 1 is fixed, the center of the shaft 2 is supported by a mounting scale 20 via a bearing 10, and the right side of the shaft 2 is supported by a roll mounting body 21 via a bearing 12. Since the motor body 1 and the roll mounting body 21 are fixed to the mounting scale 20 in the same manner as in FIG. 1, the bearing 10 supports the rotor and a part of the shaft of the motor body 1. It supports the roll 9 and other parts of the shaft.
[0015]
Also in the structure shown in FIG. 2, the bearing span is shortened by supporting the shaft by the bearings 10 and 12 with the mounting scale 20 and the roll mounting body 21, and the position of the bearing is determined so that the bearing load is nearly equal. The bracket was made simple.
[0016]
FIG. 3 shows a structure in which mechanical vibration between the electric motor body 1 and the roll side is cut off. That is, the shaft at the boundary between the electric motor body 1 and the roll side corresponding to the mounting scale 20 is narrowed, and the bearings 10a and 10b on the electric motor body 1 side are provided with an O-ring 23 for the damper effect and allowance of misalignment of the bearing. The vibration system is cut off.
[0017]
In the example shown in FIG. 2 described above, one bearing 10 and 12 is provided in the mounting scale 20 and one roller 10 and 12 at the tip of the roll mounting body 21, but there are two bearings in the roll mounting body 21. It is good also as a structure.
Further, in the example shown in FIG. 2, there is no bearing on the shaft on the side of the motor main body 1, but a bearing that supports the shaft extended by the anti-load side bracket of the motor main body 1 may be provided for vibration isolation.
1 to 3 show a structure in which the load-side bracket of the electric motor body 1 is fixed to the mounting scale, but the load-side bracket may be the mounting scale 20. In this case, the lubricating oil inlet / outlet is directly provided in the mounting scale 20.
[0018]
【The invention's effect】
As described above, according to the present invention, the bearing span is shortened, and since there are at least two bearings on the mounting scale and the roll mounting body side, the load of each bearing is reduced, and the bracket can be made a simple structure.
[Brief description of the drawings]
FIG. 1 is a half-sectional view of an example of an embodiment of the present invention.
FIG. 2 is a half-sectional view of another example.
FIG. 3 is a half-sectional view of another example.
FIG. 4 is a half-sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric motor main body 2a, 2b Shaft 6, 7 Bracket 9 Roll 10, 10a, 10b, 12, 12a, 12b Bearing 11, 13 Supply / exhaust passage 20 Mounting scale 21 Roll mounting body 22 Coupling

Claims (5)

Install the motor body on one side of the mounting scale and the roll mounting body on the other side.
Attach the roll to the tip of the shaft that penetrates this roll mounting body and connects to the shaft of the electric motor body and supports it with a bearing,
A bearing supporting the shaft is also provided near the mounting scale.
Electric motor for hot rolls.   The electric motor for hot rolls according to claim 1, wherein the shaft of the electric motor main body and the shaft of the roll attachment body are formed as an integral shaft.   The electric motor for hot rolls according to claim 1, further comprising two or more bearings for supporting the shaft in the roll mounting body.   The shaft of the electric motor main body and the shaft of the roll mounting body are formed as an integral shaft, and two or more bearings for supporting the shaft are provided in the roll mounting body, and a bearing is also provided on the non-load side of the electric motor main body. The electric motor for hot rolls as described.   The electric motor for hot rolls according to claim 2, wherein an intermediate portion of the shaft that hits the mounting scale is narrowed, and an O-ring is attached to a bearing provided on the electric motor main body side.

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