JP2004084860A - Rotary device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary device for facilitating maintenance work. <P>SOLUTION: This rotary device has a rotary shaft 12, a rotary body installed around the rotary shaft and rotating together and a bearing mechanism 15 for journaling the rotary shaft. A separating part 41 is arranged between a support part 42 of the rotary body of the rotary shaft and the bearing mechanism, to separate these. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to various rotating devices such as a rotating device for space equipment used in a space shuttle or a space station, and a rotating device for ground equipment used in a nuclear power plant or a semiconductor manufacturing plant.
[0002]
[Prior art]
As an example of this type of rotating device, for example, a microgravity rotating device 1 for space equipment used in a space shuttle, a space station, or the like is shown in FIG. In FIG. 1, reference numeral 2 denotes a space station module, in which the microgravity rotating device 1 is housed.
The microgravity rotating device 1 has, for example, four arms 3 radially mounted thereon and a rotary shaft 5 driven to rotate by a motor 4. At the end of each arm 3, an experimental box 6 is mounted. Have been. In these experiment boxes 6, an object to be subjected to gravity, such as a plant, is placed. Then, in a weightless state, the rotation shaft 5 / each experimental box 6 is rotated at a low speed of about one rotation per second, whereby an experiment is performed on the test object in each experimental box 6.
[0003]
In the microgravity rotating device 1, since the size of the test object varies in each of the test boxes 6, it is necessary to reduce the vibration caused by these rotations. Therefore, in the microgravity rotating device 1, magnetic bearings 7, 8, and 9 are provided at both ends and a central portion of the rotating shaft 5 to actively absorb the vibration, thereby reducing the imbalance of the mass of each experimental box 6. The vibration generated due to the vibration is damped, and the vibration transmitted to the microgravity rotating device 1 can be greatly reduced.
[0004]
[Problems to be solved by the invention]
In the conventional microgravity rotating device 1 described above, when a failure occurs, a crew comes out in the module 2 and it is necessary to manually identify and repair the failed portion. Since the bearings 7, 8, and 9 are located inside the apparatus, it is difficult to access them, and there is a problem that maintenance is difficult.
This is a problem especially when the failure location is not known, and it is necessary to check all the suspected failure locations.
[0005]
The present invention has been made in view of the above circumstances, and has as its object to provide a rotating device capable of facilitating maintenance work.
[0006]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, the rotating device according to claim 1, wherein the rotating device includes a rotating shaft, a rotating body attached around the rotating shaft and rotating together, and a bearing mechanism that supports the rotating shaft. A separation portion is provided between the support portion of the rotating body and the bearing mechanism of the rotating shaft and the bearing mechanism, which can separate them.
According to the rotating device of the first aspect, the rotating shaft is separated at the separating portion, so that the state between the bearing mechanism and the rotating body is integrated with a part of the rotating shaft. As it is, it can be separated.
[0007]
According to a second aspect of the present invention, there is provided the rotating device according to the first aspect, wherein the bearing mechanism includes a magnetic bearing that performs active vibration suppression.
According to the rotating device of the second aspect, even if a swinging motion occurs in the rotating shaft, the vibration can be actively damped by the magnetic bearing.
[0008]
According to a third aspect of the present invention, in the rotating device according to the first aspect, the bearing mechanism includes an elastic bearing that performs active vibration suppression.
According to the rotating device of the third aspect, even if a swinging motion occurs in the rotating shaft, the vibration can be actively damped by the magnetic bearing.
[0009]
According to a fourth aspect of the present invention, in the rotating device according to the second or third aspect, the bearing mechanism further includes a bias bearing for holding the position of the rotating shaft. I do.
According to the rotating device of the fourth aspect, the rotating shaft can be held at the center of rotation by the bias bearing.
[0010]
The rotating device according to claim 5 is the rotating device according to any one of claims 1 to 4, wherein the bearing mechanism includes a first bearing mechanism that supports one end of the rotating shaft, A second bearing mechanism for pivotally supporting the other end side, wherein the rotating body is supported at a position on the rotating shaft between the first bearing mechanism and the second bearing mechanism, and applies gravity. A box for storing an object, wherein the separating portion is provided between one or both of the first bearing mechanism and the second bearing mechanism and the support portion.
According to the rotating device according to the fifth aspect, by separating the rotating shaft in one or both of the separating portions, each of the rotating units rotates between the first bearing mechanism or the second bearing mechanism and the rotating body. Separation can be performed while maintaining the state of being integrated with a part of the shaft.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the rotation device of the present invention will be described below with reference to the drawings, but it is needless to say that the present invention is not limited to this. In the following description, an example in which the rotating device of the present invention is applied to a microgravity rotating device used in a space shuttle, a space station, or the like will be described.
[0012]
As shown in FIGS. 1 and 2, the microgravity rotating device 11 (rotating device) of the present embodiment includes a rotating shaft 12 and a plurality of experimental boxes 13 (rotating devices) mounted around the rotating shaft 12 and rotating together. A first bearing mechanism 14 that supports one end of the rotating shaft 12, a second bearing mechanism 15 that supports the other end, an upper fixing member 16 that houses the first bearing mechanism 14, A lower fixing member 17 for accommodating the two bearing mechanisms 15 and a casing for accommodating the rotating shaft 12, each experimental box 13, the first bearing mechanism 14, the second bearing mechanism 15, the upper fixing member 16, and the lower fixing member 17 (FIG. (Not shown).
[0013]
The upper fixing member 16 and the lower fixing member 17 are cylindrical members having a common axis, and are fixedly disposed in the casing at a predetermined interval in the axial direction.
Inside the upper fixing member 16, one end of the rotating shaft 12 is supported in the radial direction, and a magnetic bearing 18 for actively controlling vibration and an axis of the rotating shaft 12 are positioned at the position of the axis. A magnetic bearing 19 for supporting, a magnetic bearing 20 for supporting the rotating shaft 12 in the thrust direction, and a vibration sensor 24a are mounted. Further, a magnetic bearing 26, a bias magnetic bearing 27, and a vibration sensor 24c are attached to the inside of the upper fixing member 16 at positions to be described later.
The magnetic bearing 18, the bias magnetic bearing 19, the magnetic bearing 20, the magnetic bearing 26, the bias magnetic bearing 27, the vibration sensor 24c, and the vibration sensor 24a constitute the first bearing mechanism 14.
[0014]
Inside the lower fixing member 17, the other end of the rotating shaft 12 is supported in the radial direction, and the magnetic bearing 21 for actively controlling vibration and the axis of the rotating shaft 12 are positioned at the position of the axis. , A magnetic bearing 22 for biasing, a motor 23 for rotatingly driving the rotating shaft 12, and a vibration sensor 24 b for detecting vibration of the rotating shaft 12 are attached.
[0015]
Each of the experimental boxes 13 is a box body which is supported at a position between the first bearing mechanism 14 and the second bearing mechanism 15 and stores an object to which gravity is applied. Are supported around the rotation shaft 12 at equal angular intervals. Therefore, the experimental box 13, the arm 25, and the rotating shaft 12 form a rotating unit that rotates integrally around the axis of the rotating shaft 12.
A magnetic bearing 26, a bias magnetic bearing 27, and a vibration sensor 24c are mounted on the rotary shaft 12 at positions near the center of gravity of the rotary unit.
An exciting current for bias is applied to the biasing magnetic bearing 27 so as to support the axis of the rotary shaft 12 at the position of the axis, and the magnetic bearing 26 receives a detection signal of the vibration sensor 24c. The excitation current is actively controlled in order to maintain the axis deviation of the rotating shaft 12 at an appropriate value based on this.
[0016]
FIG. 3 shows a control system diagram of the microgravity rotating device 11. As shown in the figure, each detection signal from the vibration sensor 24a disposed at one end of the rotating shaft 12, the vibration sensor 24b disposed at the other end, and the vibration sensor 24c disposed at the center is transmitted to the control arrangement 31. Is taken in.
[0017]
Each of the vibration sensors 24a, 24b, 24c is provided around the rotating shaft 12 by four, and detects vibration of the rotating shaft 12. These vibration sensors 24a, 24b and 24c detect a gap change due to vibration between the rotating shaft 12 and each sensor and enter the control device 31. When the gap becomes small or large in the control device 31, The coil currents of the corresponding magnetic bearings 18, 21 and 26 are controlled so as to return the gap to the original gap size, and the vibration is actively controlled to be absorbed.
[0018]
That is, although the magnetic bearings 18, 21, and 26 are not shown, for example, four independent coils are arranged so that magnetic forces act in four directions, respectively. In accordance with the above, the excitation of the coil which is the largest in the variation between the coil and the gap is controlled, the repulsion force or suction force with the rotating shaft 12 is adjusted, and the displacement due to vibration is absorbed.
The control device 31 drives the motor 23, detects the vibration of the rotary shaft 12 based on the vibration sensors 24a, 24b, 24c, and excites the coils of the magnetic bearings 18, 21, 26 as necessary. By controlling the current, the repulsive force or suction force between each coil and the rotating shaft 12 is increased, and the gap between them is operated to return to the original size.
[0019]
Independently of the vibration damping control by the magnetic bearings 18, 21 and 26, the rotating shaft 12 is fixed to the shaft center by the biasing magnetic bearings 19 and 22 arranged at both ends in a state where the position is static. The rotating shaft 12 is always excited by a constant current so as to be positioned. Therefore, the magnetic bearings 18, 21, and 26 do not hold the position of the rotating shaft 12, but only perform active vibration suppression control for suppressing the vibration generated on the rotating shaft 12, so that the minute vibration is suppressed by the combined use of the bias. A decrease in performance can be prevented, and accurate vibration control can be achieved.
[0020]
Reference numeral 32 in FIG. 3 denotes a storage device in which a pattern of a required value of amplitude or acceleration with respect to a vibration frequency is stored in advance as data. In the control device 31, when each of the vibration sensors 24a, 24b, and 24c monitors the vibration of the rotating shaft 12, compared with the required value, the vibration of the rotating shaft 12 is displaced, the vibration increases, and the vibration exceeds the required value. In this case, the excitation current of each coil is controlled to absorb the vibration, and the vibration of the rotating shaft 12 is constantly controlled so as to be equal to or less than a required value.
[0021]
Further, in the present embodiment, a magnetic bearing 26, a bias magnetic bearing 27, and a vibration sensor 24c for actively controlling the vibration of the rotating shaft 12 are provided around the center of gravity of the rotating unit. The deviation from the center of gravity of the unit, that is, the center of the rotating shaft 12 from the axis is detected by the vibration sensor 24 c and input to the control device 31. The controller 31 controls the exciting current of each of the coils so that the deviation is reduced and the rotating shaft 12 comes to the axis.
[0022]
Therefore, the rotating shaft 12 is actively controlled at three positions, that is, the magnetic bearing 18 at one end, the magnetic bearing 21 at the other end, and the magnetic bearing 26 at the center, and has one end, the other end, and the center. Since the position of the rotating shaft 12 is firmly maintained at the three locations of the magnetic bearings for bias 19, 22, and 27, the vibration of the rotating shaft 12 is accurately controlled, and the swinging phenomenon of the rotating shaft 12 is effectively prevented. It can be suppressed.
[0023]
Further, as shown in FIGS. 2 and 4, the rotating device 11 of the present embodiment includes a connection portion 42 of the rotating shaft 12 for connecting each arm 25 in the direction of the axis of the rotating shaft 12. Position) and the second bearing mechanism 15 are provided with a separating portion 41 which can be separated therebetween, which is particularly characteristic.
According to the separating portion 41, the rotating shaft 12 can be changed from the connected state in FIG. 4A to the separated state in FIG. 4B. That is, in the separating portion 41, the rotating shaft 12 is divided into two parts, the first rotating shaft 12a and the second rotating shaft 12b, and the fastening bolts 43 for coaxially fastening the two are fastened or unfastened. Thereby, the second bearing mechanism 15 can be taken out of the microgravity rotating device 11 together with the second rotating shaft 12b.
[0024]
As shown in FIGS. 4A and 4B, each joint surface between the first rotating shaft 12a and the second rotating shaft 12b has a concave-convex fitting shape. At the same time that the axes of both the shaft 12a and the second rotating shaft 12b are matched, the driving force for rotating the second rotating shaft 12b by the motor 23 can be transmitted to the second rotating shaft 12a without loss.
Bolt holes 12a1 and 12b1 are formed in the first rotary shaft 12a and the second rotary shaft 12b, respectively, so as to penetrate these rotary axes, and the bolt holes 12a1 on the first rotary shaft 12a side are formed in the bolt holes 12a1. A female screw 12a2 for screwing the male screw of the fastening bolt 43 is formed.
[0025]
As shown in FIG. 2, the end 43 a of the fastening bolt 43 is exposed outside the first rotating shaft 12 a, and by rotating this, the fastening or unfastening is performed from outside the microgravity rotating device 11. It is possible. At the time of the fastening work and the fastening release work, the crew can perform the work without access so as to enter the narrow separating portion 41, so that the second bearing mechanism 15 can be easily removed / attached. .
[0026]
In addition, since the detached second bearing mechanism 15 can easily access the motor 23 and the like which could not be easily reached in the assembled state, for example, when an unknown failure occurs in the microgravity rotating device 11, The crew can easily check each component.
[0027]
The configuration of the separation unit 41 is such that the axes of both the first rotating shaft 12a and the second rotating shaft 12 are made to coincide with each other, and at the same time, the motor 23 rotates the second rotating shaft 12b without loss of the driving force for rotating the second rotating shaft 12b. It is sufficient that the signal can be transmitted to the shaft 12a, and a connection configuration other than that shown in FIG. 4 can be adopted.
For example, FIG. 5 shows an example of another configuration of the separation unit 41. In addition to the concave and convex fitting shape, a cup in which the joining end of the first rotating shaft 12a is formed at the joining end of the second rotating shaft 12b. The ring 12b3 can be connected by fitting it into the recess of the ring 12b and by bolting it from the side with a plurality of bolts 12x. In the case of this modification, if a chamfer is formed in advance at the inlet of the coupling 12b3, the connection operation between the first rotating shaft 12a and the second rotating shaft 12b can be performed more easily.
[0028]
Also in this modification, the second bearing mechanism 15 can be entirely removed while being integrated with the first rotating shaft 12b. This makes it possible to easily access the motor 23 and the like, which could not be easily reached in the assembled state. For example, when a failure of unknown origin occurs in the microgravity rotating device 11, the crew checks the components. Can be easily performed.
[0029]
Further, in the above-described embodiment, the case where the magnetic bearings 18, 21, 26 are used as the bearings for performing the active vibration suppression of the rotary shaft 12 in each of the first bearing mechanism 14 and the second bearing mechanism 15 has been described as an example. The present invention is not limited to this, and an elastic bearing that performs active vibration suppression may be provided instead. Although not shown, as the elastic bearing, a plurality of (for example, four) springs or rubbers are arranged around the rotating shaft 12 and when the rotating shaft 12 is eccentric due to vibration, the original force is generated by their elastic force. An example of such a configuration is to return to the axial center position.
Further, in the above embodiment, the case where the present invention is applied to the microgravity rotating device 11 has been described as an example. However, the present invention is not limited to this, and a rotating device for ground equipment used in a nuclear power plant or a semiconductor manufacturing plant, etc. It is needless to say that the present invention may be applied to the above-mentioned rotating device.
Further, in the above embodiment, the separating portion 41 is provided only on the second bearing mechanism 15 side. However, the present invention is not limited to this, and the separating section 41 may be provided on the first bearing mechanism 14 side, or may be provided on the first bearing mechanism 14 and the second bearing mechanism 14. It may be provided on both of the bearing mechanisms 15.
[0030]
【The invention's effect】
According to the rotating device according to the first aspect of the present invention, by separating the rotating shaft at the separating portion, the bearing mechanism can be entirely removed while being integrated with a part of the rotating shaft. Can be facilitated.
Further, according to the rotating device of the second aspect, by providing the bearing mechanism with the magnetic bearing that performs active vibration suppression, it becomes possible to effectively perform the vibration suppression of the rotating shaft.
According to the rotating device of the third aspect, by providing the bearing mechanism with the elastic bearing that performs active vibration suppression, it becomes possible to effectively perform vibration suppression of the rotating shaft.
Further, according to the rotating device of the fourth aspect, since the bearing mechanism further includes the bias bearing, it is possible to more effectively control the vibration of the rotating shaft.
According to the rotating device of the fifth aspect, the first bearing mechanism or the second bearing mechanism is entirely removed while being integrated with a part of the rotating shaft by separating the rotating shaft at the separating portion. Therefore, maintenance work can be facilitated.
[Brief description of the drawings]
FIG. 1 is a view showing a microgravity rotating device which is an embodiment of a rotating device of the present invention, and is a plan sectional view as seen in a plan section including a rotation axis.
FIG. 2 is an explanatory diagram illustrating a control mechanism of the rotating device.
FIG. 3 is a diagram showing the rotating device, and is an enlarged view of a portion A in FIG. 1;
FIGS. 4A and 4B are enlarged views of a portion B of FIG. 2 for explaining a separation portion of the rotating device, wherein FIG. 4A shows a state before separation and FIG.
5 is a diagram illustrating a modification of the separation unit of the rotating device, and is an enlarged view corresponding to a portion B in FIG. 2;
FIG. 6 is a view showing a microgravity rotating device as an example of a conventional rotating device, and is a plan sectional view as viewed in a section including a rotation axis.
[Explanation of symbols]
11 ... Microgravity rotating device (rotating device)
12 ... rotating shaft 13 ... experiment box (rotating body, box)
14 first bearing mechanism 15 second bearing mechanism (bearing mechanism, second bearing mechanism)
21: Magnetic bearing 22: Magnetic bearing for bias (Bearing for bias)
41 separation part 42 support part

Claims (5)

A rotating device comprising: a rotating shaft, a rotating body attached around the rotating shaft and rotating together, and a bearing mechanism that supports the rotating shaft.
A rotating device, characterized in that a separating section is provided between the supporting portion of the rotating body and the bearing mechanism of the rotating shaft, and the bearing mechanism is separable therebetween. The rotating device according to claim 1,
A rotating device, wherein the bearing mechanism includes a magnetic bearing that performs active vibration suppression. The rotating device according to claim 1,
A rotating device, wherein the bearing mechanism includes an elastic bearing that performs active vibration suppression. In the rotating device according to claim 2 or 3,
The rotating device according to claim 1, wherein the bearing mechanism further includes a bias bearing for holding the position of the rotating shaft. The rotating device according to any one of claims 1 to 4,
The bearing mechanism includes a first bearing mechanism that supports one end of the rotating shaft and a second bearing mechanism that supports the other end.
The rotating body is a box that is supported at a position of the rotating shaft between the first bearing mechanism and the second bearing mechanism and that contains an object to which gravity is added,
A rotating device, wherein the separating portion is provided between one or both of the first bearing mechanism and the second bearing mechanism and the supporting portion.

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