JPH08284962A - Rotating body supporting device - Google Patents

Abstract

PURPOSE: To eliminate the wear of a bearing by feeding the high pressure air from an air feeding port at the prescribed position of a housing to house the bearing, and increasing the air pressure in the housing more than the air pressure in the dust atmosphere. CONSTITUTION: A shaft 14 and a conveying roller 5 are rotated by a drive motor through an endless chain and a sprocket 30. A square steel tube is loaded on and conveyed by the conveying roller 5, and the silica sand injected during that time cleans the surface of the square steel tube. The high pressure air to be fed from an air feeding port 28 flows in the arrow direction, passes through the outer circumference of a bearing 21, and is accelerated and injected from the air outlet 27 into the dusty atmosphere. Thus, no dust enters from the air outlet 27 even when it is in the dusty atmosphere, or no seal is deteriorated by the wear because the air outlet 27 has no mechanically contact part. As a result, the bearing is not worn, and a rotating body supporting device is difficult to be failured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for a rotating body that rotates in an atmosphere of dust or the like.

[0002]

2. Description of the Related Art Various types of devices for supporting a rotating body have been known. For example, when the rotating body is a carrying roller, a supporting device for supporting the carrying roller is described in JP-A-61-244429. In this apparatus, as shown in FIG. 6, a shaft 102 of a conveying roller 101 is supported by a support frame 103, a sprocket 104 is provided at one end of the shaft 102, and the conveying roller 101 is rotationally driven. The support frame 103 is a pit 1 which is a base for mounting the device.
It is fixed at 05. Also, a bearing, such as a bearing, is typically used to support the shaft 102 (not shown).

Further, in order to protect the bearing from dust, a supporting device for supporting the rotating body in an atmosphere with much dust is required.
Conventionally, mechanical seals such as O-rings and dust seals have been used.

[0004]

However, in mechanical seals such as conventional O-rings and dust seals, the mechanical contact portion between the seal and the shaft is worn away and the sealing effect is lost, and as a result, dust in the bearing is lost. There was a problem that the bearing would wear out in a short period of time due to intrusion.

The present invention has been made under such a background, and an object thereof is to provide a rotating body supporting device in which the wear of the bearing is reduced.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is a rotating body supporting device for supporting a rotating body which rotates in a dust atmosphere, wherein a shaft of the rotating body is provided. A housing that encloses a bearing that rotatably supports is provided, and high-pressure air is supplied from an air supply port provided at a predetermined position of the housing so that the air pressure in the housing is higher than the air pressure in the dust atmosphere. I am trying.

According to a second aspect of the present invention, there is provided the rotating body supporting device according to the first aspect, wherein the housing is formed in a tubular shape, and an air outlet is provided at an end portion of the housing on the outer circumference of the shaft. The feature is that it is formed as a gap.

Further, the invention according to claim 3 is the rotating body supporting device according to claim 1 or 2, wherein the rotating body is a conveying roller.

[0009]

According to the first aspect of the present invention, the high pressure air is supplied from the air supply port so that the air pressure in the housing is higher than the air pressure in the dust atmosphere. Therefore, in the gap between the housings, air is blown out from inside the housing to outside the housing (in the dust atmosphere). Due to this blown-out air, dust cannot counter the flow of air and enter the housing. Therefore, the bearing surrounded by the housing is not exposed to dust.

In the structure according to the second aspect, the air is blown out from the air outlet provided on the dust atmosphere side.
Since this air outlet has a small passage cross-sectional area, air is accelerated and ejected.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a main part of a carrying roller assembly (rotating body supporting device) according to an embodiment of the present invention, and FIG. 4 is a perspective view showing the state in which the conveying roller assembly is attached, and FIG.
FIG. 5 is an exploded view showing an attaching method of the conveying roller assembly, and FIG. 5 is a diagram showing a supporting method of the conveying roller assembly. Incidentally, the blast machine applied to this embodiment, when manufacturing the building unit in the factory in advance,
A cleaning device that removes oil, dust, water, etc. from the surface of the square steel pipe (floor beam) to improve the adhesion between the floor beam made of square steel pipe and the floor material such as particle board. is there. This cleaning is performed by spraying silica sand onto the surface of the square steel pipe at high speed.

As shown in FIG. 2, the main body 4 of the blast machine 1
Is provided with an inlet 2 and an outlet 3 for inserting the square steel pipe W. Conveyor rollers 5 (see FIG. 3) are arranged at the bottom of the blast machine body 4 at predetermined intervals in the traveling direction of the square steel pipe W. The carrying roller 5 is attached to the blast machine body 4 as a carrying roller assembly 6.
Further, the silica sand sprayed by a blower (not shown) is collected from a hopper 7 provided at the bottom of the blast machine body 4. As shown in FIGS. 3 and 4, the transport roller assembly 6 has a mounting hole 8 provided in the blast machine body 4.
Insert from and install with bolts. The attached transport roller assembly 6 is supported by the support member 9. As shown in FIG. 5, the support member 9 is provided with semicircular cutouts at predetermined intervals, and supports the lower side of the transport roller assembly 6.

As shown in FIG. 1, the transport roller 5 is composed of a cylindrical roller base 12 and a urethane rubber roller body 13 provided on the outer periphery of the roller base 12. The roller base 12 is fixed to the shaft 14 in the rotational direction by a key 15. Further, the shaft 14 is attached to the roller base 12.
It is fixed in the axial direction by a bolt 16 via an end member 17 so as not to come off.

The shaft 14 is rotatably supported by bearings 20 and 21. The inner casings 20a and 21a of the bearing are fixed to the shaft 14, respectively. The outer casings 20b and 21b are locking members 2 each having a cylindrical shape.
It is fixed to 2, 23. The locking members 22 and 23 are fixed to the inner surface of a cylindrical housing 25. Further, the housing 25 is fixed to the mounting member 26 by welding. The mounting member 26 is fixed to the blast machine body 4 by bolts so that it can be mounted and removed. The inner side surface of the locking member 22 is in almost contact with the circumferential surface of the shaft 14 and is kept airtight to some extent. On the other hand, the locking member 23
The inner surface of the is partially separated from the circumferential surface of the shaft 14, and the air is configured to flow through the outer circumference of the bearing 21.

The collar 26 is fixed to the shaft 14 at the position of the end of the housing on the dust atmosphere side.
An air outlet 27 for blowing out air is formed as a thin cylindrical gap between the outer circumferential surface of and the inner surface of the end of the housing 25. On the other hand, an air supply port 28 for supplying high pressure air is provided at an appropriate position on the opposite end of the housing 25. As this high-pressure air, compressed air for blowing out blown air at a predetermined speed is used. Compressed air is supplied from a compressor not shown.

A sprocket 30 is attached to the end of the shaft 14 opposite to the conveying roller 11 by a key 31 and a fixing member 32.
4 is fixed. An endless chain is wound around the sprocket 30 (not shown). The endless chain is rotationally driven by a drive motor (not shown). The air supply port 28, the sprocket 30, etc. are provided in the blast machine body
It is provided outside of.

This embodiment is constructed as described above and operates as follows. When you drive the drive motor,
The endless chain rotates and the shaft 1 passes through the sprocket 30.
4 and the transport roller 11 fixed to the shaft 14 rotates.
The square steel pipe W inserted from the inlet 2 is placed on the conveying roller 11, is conveyed by the conveying roller, and is discharged from the outlet 3. During this time, the silica sand sprayed by the sprayer cleans the surface of the rectangular steel pipe W. The transport speed is appropriately controlled by the drive motor. Further, the high-pressure air supplied from the air supply port 28 flows in the direction of the arrow shown in the figure, passes through the outer periphery of the bearing 21, and the air outlet 27
Ejected into a dustier atmosphere. Air outlet 27
Since the cross-sectional area of the passage is small, the air is accelerated and flows out here.

Therefore, according to the configuration of this embodiment, even if the air outlet is in the dust atmosphere, dust does not enter from here. Further, since there is no mechanical contact portion at the air outlet, the seal does not deteriorate due to wear. As a result, the wear of the bearing is reduced, and it is possible to obtain the effect that the failure of the device is unlikely to occur. Further, the bearing replacement cycle is extended from about 2 months to more than 2 years, and the work for bearing replacement can be reduced.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure is not limited to this embodiment, and there are design changes and the like without departing from the scope of the invention. However, it is included in this invention. For example, although the ball is described as the bearing in this embodiment, the same effect can be obtained even in the case of the roller bearing. Further, the present invention is not limited to the blast machine.

[0020]

As described above, according to the structure of the first aspect, it is possible to obtain the effect that the wear of the bearing is reduced and the failure is reduced. Further, according to the configuration of the second aspect, it is possible to easily obtain a better seal, and it is possible to obtain the effect of further reducing the wear of the bearing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main part of a conveying roller assembly (rotating body supporting device) according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an external configuration of a blast machine to which the rotation supporting device is applied.

FIG. 3 is a view showing a state in which the conveyance roller assembly is attached.

FIG. 4 is an assembly exploded view showing a method of mounting the transport roller assembly.

FIG. 5 is a diagram showing a method of supporting the transport roller assembly.

FIG. 6 is a front view showing a conventional method of supporting a transport roller.

[Explanation of symbols]

 5 Transport Roller (Rotating Body) 6 Transport Roller Assembly (Rotating Body Supporting Device) 13 Roller Main Body 14 Shaft (Drive Shaft) 20, 21 Bearing 25 Housing 27 Air Blow Out Port 28 Air Supply Port

Claims (3)

[Claims] 1. A rotating body supporting device for supporting a rotating body that rotates in a dust atmosphere, wherein a housing surrounding a bearing that rotatably supports a shaft of the rotating body is provided, and a housing is provided at a predetermined position of the housing. A rotary body supporting device, characterized in that high pressure air is supplied from an air supply port provided so that the atmospheric pressure in the housing is higher than the atmospheric pressure in the dust atmosphere. 2. The rotating body supporting device according to claim 1, wherein the housing is formed in a tubular shape, and the air outlet is formed as a gap at an outer periphery of the shaft at an end portion of the housing. 3. The rotating body supporting device according to claim 1, wherein the rotating body is a conveying roller.