JP2505243Y2 - Grounding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a grounding device that releases static electricity generated in a rotating body.

<Prior Art> A rotating body such as a large rotating drum is liable to generate static electricity due to the effect of friction between the rotating body and a support portion that supports the rotating body.

The noise due to the static electricity affects the control for limiting the drive of the rotating body, and causes a malfunction.

In order to solve such a problem, there has been a grounding device provided with a brush-shaped contactor that comes into contact with the peripheral surface of the rotating body to release the static electricity.

<Problems to be Solved by the Invention> However, in this grounding device, since the contactor is in contact with the peripheral surface having a high speed, there is a problem that the contactor is worn early and is inferior in durability.

The present invention has been made in view of the above problems, and an object thereof is to provide a grounding device capable of improving durability.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has a ring that abuts on a peripheral surface of a rotating body and is rotated by following the rotating body, rolling on an inner peripheral surface of the ring. The shaft of the grounding device body is grounded through a plurality of rolling elements, a cap that rotates integrally with the ring is attached to the end surface of the ring, and the tip of the shaft is Alternatively, a sphere that is rotatably pressed against the tip of the shaft is pressed against the center of rotation of the cap, and the ring, the cap, the sphere, and the grounding device body are made of a conductive material. It is a thing.

<Operation> According to the above configuration, the static electricity generated in the rotating body is transferred to the outside through the ring, the cap and the shaft of the grounding device main body, or through the ring, the cap, the sphere and the shaft of the grounding device main body. You can escape. Since the tip of the shaft or the sphere is pressed against the center of rotation of the cap,
The relative speed between the two can be reduced, and wear can be suppressed.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a sectional view and a perspective view showing a grounding device as one embodiment of the present invention.
Grounded grounding device body 1, shaft portion 2 provided at the end of the grounding device body 1, and raceway surface 22a on the outer periphery of the shaft portion 2.
Balls 3 made of ceramics as a plurality of rolling elements rolling on the ball, and rolling the balls 3 on the raceway surface 42 provided on the inner peripheral surface 41,
A ring 4 rotatably supported by a shaft portion 2 via a ball 3, a cap 5 fitted on an end portion 4a of the ring 4 on the shaft portion 2 side, and a spherical recess at a tip 2a of the shaft portion 2. It is composed of a spherical body 6 interposed between the spherical recessed portion 51 in the center of the cap 5 and 23.

The grounding device main body 1, the shaft portion 2, the ring 4, the cap 5 and the spherical body 6 are each made of a material having good conductivity such as metal, and the ring 4, the cap 5 and the spherical body 6 are separated from the rotary drum 10. Electrical continuity is secured to the grounding device body 1 via the device.

The shaft portion 2 is parallel to the shaft center of the rotary drum body 10, is fitted onto the shaft portion main body 21 and the shaft portion main body 21, and is provided with the raceway surface 22a.
And an outer peripheral member 22 having. Sphere 6 is cap 5
Is pressed against the center of rotation (the center of rotation of the ring 4).

The outer peripheral surface 43 of the ring 4 is the rotating drum 10 as a rotating body.
The ring 4 is brought into contact with the outer peripheral surface 10a of the rotary drum 10 and rotates following the rotary drum 10.

The cap 5 has a lid shape fitted to the outer periphery 4b of the end 4a of the ring 4.

According to this embodiment, static electricity generated in the rotating drum 10 is released to the outside from the outer periphery 10a of the rotating drum 10 through the conductive link 4, cap 5, sphere 6 and grounding device body 1 in order. be able to. Therefore, it is possible to prevent the noise caused by static electricity from adversely affecting the control device or the like for driving the rotating drum 10 and inducing a malfunction.

Further, since the sphere 6 is brought into contact with the center of rotation of the cap 5, the relative speed between the two can be reduced to suppress wear and improve durability.

Furthermore, since the balls 3 are made of ceramics, no lubricant is required and there is no risk of electrolytic corrosion on the raceway surfaces 22a and 42.

FIG. 3 shows another embodiment. This example
The structure different from the above-mentioned embodiment is that the tip 2a of the shaft portion 2 has a hemispherical shape, and the tip 2a is an elastic piece formed on the cap 5.
Being pressed against 5a (see FIG. 4) and the ball 3
That is, a pair of sealing members 7 sandwiching the above is provided. The sealing member 7 is fixed to the ring 4 and has a contact or non-contact sealing structure between the inner peripheral portion of the sealing member 7 and the shaft portion 2.

According to this embodiment, in addition to the same effect as the above-described embodiment, the pressure contact state between the elastic piece 5a and the cap 5 is secured until the tip 2a of the shaft portion 2 is worn by a predetermined amount. Therefore, the durability can be further improved. Further, when a lubricant is used, the sealing member 7 can prevent the lubricant from leaking out, ensure the electrical connection between the elastic piece 5a and the tip 2a of the shaft portion 2, and prevent the raceway surface 22a, 2. The effect of preventing electrolytic corrosion can be enhanced.

Note that the present invention is not limited to the above-described embodiment, and for example, the grounding device is applied as a component of an electric circuit for flowing a current such as an electric signal, and the ring 4 is provided on the inner circumference of the rotating body. The invention is brought into contact with a surface, a roller is used as a rolling element, the cap 5 is integrally formed with the ring 4, the shaft body 21 and the outer peripheral member 22 are integrally formed, and the like. Various design changes can be made within a range that does not change.

<Effect of the Invention> As described above, according to the above-mentioned invention, the static electricity generated in the rotating body can be released to the outside through the ring, the cap, the grounding device main body, and the like. The tip of the shaft of the grounding device body,
Alternatively, since the spherical body held on this shaft is pressed against the center of rotation of the cap, the relative speed between the two can be reduced to suppress wear and improve durability. Play.

[Brief description of drawings]

FIG. 1 is a sectional view of a grounding device as an embodiment of the present invention, FIG. 2 is a schematic view of a grounding device, FIG. 3 is a sectional view of a grounding device of another embodiment, and FIG. It is a front view. 1 …… Grounding device main body, 2 …… Shaft, 2a …… Tip, 3 ……
Ball (rolling element), 4 ring, 5 cap, 6
...... Sphere, 10 ... Rotating body, 10a ... Peripheral surface.

Claims (1)

(57) [Scope of utility model registration request] 1. A grounding device main body in which a ring, which is in contact with the peripheral surface of a rotating body and rotates following the rotating body, is grounded through a plurality of rolling elements rolling on the inner peripheral surface of the ring. While being supported by the shaft portion, a cap that rotates integrally with the ring is attached to the end surface of the ring, and the tip of the shaft portion, or a spherical body press-rotatably pressed to the tip of the shaft portion, It is pressed against the center of rotation of the cap, and the ring, cap, sphere, and grounding device body are
A grounding device characterized by being made of a conductive material.