JPH0460211A - Rotary bearing - Google Patents

Abstract

PURPOSE:To keep a weight on an arm always horizontally by holding a rotary shaft tiltingly while providing eccentric lower part of the rotary shaft installed perpendicularly on the arm, holding an upper part of the shaft by means of a rotatable automatic aligning bearing, and thereby absorbing a deflecting amount of the arm by means of tilting of the rotary shaft. CONSTITUTION:An upper bearing supporting plate 12 having an upper automatic aligning bearing 11 is inserted into an upper bearing installing hole 17 of a column 1. A lower bearing supporting plate 15 having a lower automatic aligning bearing 14 is inserted into a lower bearing installing hole 18 of the column 1. A rotary shaft 13 is fitted to a rotary shaft inserting hole 21 of the upper automatic aligning bearing 11 and a rotary shaft inserting hole 22 of an aligning block 16 inserted into the lower automatic aligning bearing 14. The rotary shaft inserting hole 22 is eccentrically formed, so that the rotary shaft 13 is eccentrically rotated around a rotary center 7. Bending of an arm 5 is thus compensated, and a weight 6 is kept horizontally. The weight 6 is always kept horizontally when the adjusting block 16 having eccentric rate corresponding to the weight thereof is prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary bearing, and more particularly to a rotary bearing in which the inclination of an arm caused by an uneven load is apparently improved.

(Prior Art) A rotary bearing that receives a vertical shaft provided at one end of a horizontal arm and rotates the horizontal arm about the vertical shaft has a structure as shown in FIG. In the figure, 1 has an upper rotation bearing 2 at the top and a lower rotation bearing 3 at the bottom.
This is a support column that supports the rotating shaft 4 inserted into the lower rotating bearing 3. An arm 5 is attached to the upper part of the rotating shaft 4,
The arm 5 has a heavy object 6 placed on its end and rotates around a rotation center 7 by a rotation shaft 4 while being supported by an upper rotation bearing 2 and a lower rotation bearing 3.

(Problem to be Solved by the Invention) By the way, in the case where the heavy object 6 is heavy and the heavy object 6 is placed on only one end of the arm 5, the arm 5 is curved and the bent arm 5 is rotated. Sometimes the rotating surface of the heavy object 6 cannot be kept horizontal.

Conventionally, a method as shown in FIG. 9 has been used to rotate the heavy object 6 while holding it in a horizontal plane. In the figure, the same parts as in FIG. 8 are given the same reference numerals.

As is clear from the figure, when attaching the arm 5 to the rotating shaft 4, the arm 5 is attached diagonally, taking into account the amount of deflection of the arm 5 in advance, so that the heavy object 6 maintains a horizontal posture when rotated. It's ours. This method has the following problems.

(b) Processing is difficult.

(b) When the weight of heavy objects changes, the slope changes, making it impossible to keep all heavy objects horizontal.

The present invention has been made in view of the above points, and an object of the present invention is to realize a rotating bearing that can maintain rotation due to the unbalanced load or maintain a horizontal posture even when an unbalanced load is applied.

(Means for Solving the Problems) The present invention for solving the above-mentioned problems is a rotary bearing that supports a rotating shaft to which an arm on which a heavy object is mounted and rotates the heavy object without tilting it, comprising: a support column having an upper bearing mounting hole in the upper part into which an upper rotation bearing for holding the rotation shaft is inserted, and a support column having a lower bearing mounting hole in the lower part into which the lower rotation bearing for holding the lower part of the rotation shaft is inserted; The upper bearing support plate, which is the upper rotating bearing, is inserted into the upper bearing mounting hole of the support column, the upper self-aligning bearing is rotatably attached to the upper bearing support plate, and the upper bearing support plate is inserted into the lower bearing mounting hole of the support column. A lower bearing support plate that is a lower rotating bearing, a lower self-aligning bearing rotatably attached to the lower bearing support plate, and the rotating shaft is inserted according to the weight of the heavy object fitted into the hollow part of the lower self-aligning bearing. and an adjustment block provided with an eccentric rotation shaft insertion hole.

(Function) The lower part of the rotating shaft attached at right angles to the arm is eccentrically held so that the rotating shaft is tilted, and the upper part is held by a self-aligning bearing that can freely rotate through 360 degrees to control the amount of deflection of the arm. The inclination of the rotating shaft absorbs the force and rotates the heavy object placed on the arm while keeping it horizontal.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural diagram of a rotary bearing according to an embodiment of the present invention, and also shows a state in which it is connected to an arm. In the figure, the same reference numerals are used for parts equivalent to those in FIG. 8. In the figure, 11 is a 360 installed in place of the conventional upper rotation bearing 2.
The upper self-aligning bearing is rotatable over 30 degrees, and is rotatably held by the upper bearing support plate 12 and inserted into the upper bearing mounting hole 17 of the support column. Reference numeral 13 denotes a rotating shaft that is attached to the end of the arm 5 and has a stepped cylindrical shape with the lower part narrower than the upper part, and is different from the previously mentioned rotating shaft 4 in that it has a cylindrical shape with the same diameter. There is. 14 is the lower bearing support plate 1
5 is a lower alignment bearing rotatably held over a 360° range, and is attached to a lower bearing support plate 15 and fitted into a lower bearing mounting hole 18 of a support column. An adjustment block 16 is inserted into the hollow portion of the lower self-aligning bearing 14.

Here, self-aligning bearings 11 and 14, adjustment block 1
6. The general structure of the rotating shaft 13, arm 5, and support column 1 will be explained with reference to FIGS. 2, 3, 4, and 5. Figure 2 is a schematic structural diagram of the upper self-aligning bearing 11, (a)
The figure is a plan view, and the figure (b) is a sectional view taken along line A-A. As shown in the figure, the upper bearing support plate 12 rotates the upper self-aligning bearing 11, which has a cylindrical shape with a trapezoidal cross section whose lower part is smaller than the upper part, and which has a shape in which the top and bottom of a sphere are cut at the center. It is held freely. The rotation shaft 1 is located in the center of the upper self-aligning bearing 11.
A rotary shaft insertion hole 21 for inserting the rotary shaft 13 is provided, and the inserted rotary shaft 13 can be held at an angle. The lower self-aligning bearing 12 also has a similar structure.

FIG. 3 is a structural diagram of the adjustment block. In the figure,
Figure (a) is a front view, and figure (b) is a plan view. In the figure, 2
Reference numeral 2 denotes a rotating shaft insertion hole into which the lower part of the rotating shaft 13 is inserted, and is provided eccentrically with respect to the outer periphery of the adjustment block 16. Reference numeral 23 is a fixing screw hole for attaching a set screw for fixing the rotating shaft 13 inserted into the rotating shaft insertion hole 22.

Figure 4 shows the arm 5 and the rotating shaft 1 attached to it.
It is a structural diagram of No. 3. In the figure, (a) is a front view, (
b) The figure is a bottom view. This arm 5 and rotating shaft 13 are attached at right angles.

Further, the tip of the rotating shaft 13 has a smaller diameter than the base.

FIG. 5 is a structural diagram of the support column 1, in which (a) is a plan view and (b) is a sectional view taken along line AA in (a).

In the figure, the same parts as in FIG. 1 are given the same reference numerals. The upper bearing support plate 12 is inserted into the upper bearing mounting hole 17, and the lower bearing support plate 15 is inserted into the lower bearing mounting hole 18.
is inserted.

Next, the operation of the rotary bearing shown in FIG. 1 will be explained. The upper bearing support plate 12 with the upper self-aligning bearing 11 attached thereto is inserted into the upper bearing mounting hole 17 of the support column 1 . Furthermore, the lower bearing support plate 15 to which the lower self-aligning bearing 14 is attached is inserted into the lower bearing mounting hole 18 of the support column 1 . Although this fixing method is not shown, it can be done by an appropriate method such as screwing. After attaching the upper bearing support plate 12 and the lower bearing support plate 15, insert the rotation shaft 13 into the rotation shaft insertion hole 2 of the upper self-aligning bearing 11.
1, and then the tip of the rotating shaft 13 is fitted into the rotating shaft insertion hole 22 of the adjustment block 16 inserted into the lower self-aligning bearing 11. When the rotating shaft 13 is inserted in this way, since the rotating wheel insertion hole 22 of the adjustment block 16 is provided eccentrically, the rotating shaft 13 is attached obliquely to the support column 1, and the rotating shaft 13 is eccentrically installed. By rotating around a rotation center 7, the bending of the arm 5 on which the heavy object 6 is placed is compensated, and the heavy object 6 at the tip of the arm 5 is kept horizontal. Rotating shaft insertion hole 22 in adjustment block 16
The amount of inclination of the rotating shaft 13 can be adjusted by the amount of eccentricity of can be kept.

FIG. 6 is a diagram showing a state in which the arm 5 on which a heavy object 6 is mounted is rotated using the rotary bearing of this embodiment. b) The figure shows a case where the arm 5 is on the right side. In the figure, the first
The same parts as in the figure are given the same reference numerals. As clearly shown in the figure, the upper self-aligning bearing 11 and the lower self-aligning bearing 14 are installed above and below the support column 1, and the eccentric rotation shaft insertion hole 22
By using the adjustment block 16 having the following structure, the heavy object 6 can always rotate horizontally even if the arm 5 rotates.

Note that the present invention is not limited to the above embodiments. FIG. 7 shows a structural diagram of another embodiment of the present invention. In the figure, the same parts as in FIGS. 1 and 8 are given the same reference numerals. The rotating bearing of this embodiment uses a conventional lower rotating bearing 3 instead of a rotating bearing consisting of a lower bearing support plate 15 and a lower self-aligning bearing 14, and a rotating shaft 1 attached to an arm 5.
At least two bolts 30 are attached to the tip of the rotating shaft 13.
It is installed so that it is tilted. By doing this, there is no need to use the adjustment block 16, and
The inclination of the rotating shaft 13 can be changed by changing the screwing amount of the bolt 30.

(Effects of the invention) By using a simple processing method and parts, the inclination of the arm caused by unbalanced loads can be adjusted, and the heavy object can now be kept horizontal at all times. Moreover, even if the weight of a heavy object changes, it can be easily changed.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of an embodiment of the present invention, Fig. 2 is a structural diagram of a rotating bearing used in the embodiment of Fig. 1, Fig. 3 is a structural diagram of an adjustment block, and Fig. 4 is an arm and rotation diagram. Fig. 5 is a structural diagram of the support column; Fig. 6 is an explanatory diagram of the embodiment of Fig. 1 in operation; Fig. 7 is a structural diagram of another embodiment of the present invention; FIG. 9 is an explanatory diagram of the posture of a conventional rotary bearing, and FIG. 9 is a diagram of a method for horizontally moving a heavy object using a conventional rotary bearing. ]...Support column 5...Arm 6...Heavy object 11...Upper self-aligning bearing 12...
- Upper bearing support plate 13...Rotating shaft 14...Lower self-aligning bearing 15...Lower bearing support plate 16...Adjustment block 17...Upper bearing mounting hole 18...
Lower bearing mounting holes 21, 22...Rotating shaft insertion hole 30...Bolt No. (a) Turn 1 insertion hole (b) Fig. 5 Arm No. (b) Fig. (a) (b) ) Figure ＼7 Center of rotation

Claims (2)

[Claims] (1) A rotary bearing that supports a rotary shaft (13) to which an arm (5) carrying a heavy object (6) is attached and rotates the heavy object (6) without tilting, the rotary shaft being mounted on the upper part. It has an upper bearing mounting hole (17) into which the upper rotation bearing for holding the lower part of the rotation shaft (13) is inserted, and a lower bearing mounting hole (17) into which the lower rotation bearing for holding the lower part of the rotation shaft (13) is inserted. 18), an upper bearing support plate (12) which is the upper rotation bearing inserted into the upper bearing mounting hole (17) of the support pillar (1), and an upper bearing support plate (12) rotatably attached thereto. Upper self-aligning bearing (11)
and a lower bearing support plate (15), which is the lower rotating bearing, inserted into the lower bearing mounting hole (18) of the support column (1), and a lower self-aligning bearing (14) rotatably attached to the lower bearing support plate (15).
), and the rotating shaft insertion hole (22) into which the rotating shaft (13) is inserted is eccentrically set according to the weight of the heavy object (6) fitted into the hollow part of the lower self-aligning bearing (14). A rotary bearing characterized in that it consists of an adjustment block (16) provided. (2) A lower rotating bearing (3) which is a normal rotating bearing installed in the lower bearing mounting hole (18) and at least two bolts (30) for holding the rotating shaft (13) at an angle. A rotating bearing characterized by comprising: