JPH0712137A - Driver for agitator - Google Patents

Abstract

PURPOSE:To provide an agitating device usable even in a high temperature atmosphere while facilitating the maintainability of a driver by providing fixed shaft joints one of which is axially movable. CONSTITUTION:Fixed shaft joints 7, 8 one of which is axially movable are provided between a driver 9 and a bearing 4 for supporting an agitation shaft piercing a container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer drive device suitable for a vertical stirrer, which is restricted in height because it is installed in a building or the like.

[0002]

2. Description of the Related Art Conventionally, as a method of mounting a bearing for supporting a stirring shaft in a vertical stirrer, a two-point bearing is provided as shown in FIG. A method of connecting the stirring shaft and the drive unit with a universal shaft joint, a method of directly connecting the stirring shaft to the transmission with a transmission and a fixed shaft joint as shown in Fig. 9.13, or "Design Operation Series No. 1 stirrer "1
As shown in page 35, the one in which the stirring shaft is directly connected to the gear shaft of the speed reducer is used.

[0003]

When stirring the substance in the container by the above-mentioned conventional technique, the stirring shaft is supported by two bearings in order to prevent the stirring shaft from swinging around. In order to reduce the load of the bearing, it is necessary to make the bearing spacing as long as possible, and because the end surface of the stirring shaft is directly connected to the drive unit by a universal joint that absorbs thermal expansion between the bearings, the height of the upper part of the container is However, there have been problems such as the need to elevate the ceiling of the building and the high maintenance and maintenance place for the drive unit. When the variable speed reducer and the stirrer are directly connected, the structure is such that the thermal expansion due to the ambient temperature between the stirrer and the variable speed reducer escapes in the shaft sealing direction. However, in case of mechanical seal, there was a problem such as leakage.

On the other hand, in the case of the system in which the stirring shaft and the gear shaft are directly connected, it becomes difficult to absorb the thermal expansion of the shaft between the bearing at the lower end of the gear shaft and the stirring shaft bearing, and an unreasonable load is applied to the bearing portion, and the bearing It cannot be used in a high temperature atmosphere because it will damage the bearing, and since the gear shaft and the stirring shaft are a single shaft, the reducer and stirring shaft cannot be separated, and each bearing must be replaced. There were problems such as maintenance work such as oil seal replacement and oil seal replacement.

The object of the present invention is to shorten the length of the stirring shaft in the upper part of the container, reduce the height of the driving device in the upper part of the container, to facilitate the maintainability of the driving device, and to affect the shaft sealing portion even in a high temperature atmosphere. It is to provide a drive device for a stirrer that does not provide

[0006]

In order to achieve the above object, one of fixed shaft couplings is axially arranged between a drive unit and a bearing unit that supports a radial load and a thrust load of a stirring shaft that penetrates a container. A free-moving fixed shaft joint is provided, and a stirring shaft is connected to this.

Also, by fitting and inserting a flange that moves freely in the axial direction on the outer periphery of the boss of the fixed shaft coupling, the output shaft of the drive device is replaced if the fitting portion is worn due to axial movement or the like. Without changing the fixed shaft coupling.

[0008]

The height of the upper part of the container can be lowered by connecting the stirring shaft outside the container with the drive device by the fixed shaft joint, one of which can move in the axial direction. The thermal expansion of the shaft, which is supported by the bearings of the device and is caused by the ambient temperature between the drive device and the bearings provided on the agitation shaft, does not move in the shaft sealing direction. The drive device and the agitation shaft can be easily separated by being absorbed by the movement to and the fixed shaft coupling being split.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1
Is a container, 2 is a shaft seal portion of the stirring shaft 3 that penetrates the container 1, and 4 is a bearing that supports the load of the stirring shaft 3 in the thrust direction and the radial direction, and is fixed by a bearing box 5 and a bearing lid 6. Reference numeral 7 denotes a lower fixed shaft joint inserted and fixed to the stirring shaft 3, and a reamer to the upper fixed shaft joint 8 loosely inserted into the output shaft 10 supported by a bearing 11 installed in the drive device 9 with a gap 13 provided therebetween. The radial load applied to the agitating part, which is connected by the bolts 12, is supported by the bearing 4 above the shaft sealing part 2 and the bearing 11 installed in the drive device 9, and the rotation is reamer of the vertical fixed shaft couplings 8, 7 from the drive device 9. It is transmitted to the stirring shaft 3 via the bolt 12. When thermal expansion occurs in the shaft between the bearings 4 and 11 due to a temperature rise of the stirring shaft 3 during operation, the output shaft 10
The upper and lower fixed shaft couplings 8 and 7 can move by the gap 13 between the parts to absorb the thermal expansion, the thrust load generated by the thermal expansion to the bearings 4 and 11 can be eliminated, and the shaft in the direction of the shaft sealing part 2 can be eliminated. The movement is eliminated, and the leakage of the mechanical seal of the shaft sealing portion 2 can be prevented.

FIG. 2 shows another embodiment in which a flange that is movable in the axial direction is attached to the outer periphery of the boss of the fixed shaft coupling, and power can be transmitted to the outer periphery of the coupling boss 16 that is inserted and fixed to the output shaft 10 through the key 14. Flange 15 is loosely inserted into the coupling boss 16 so that the bearings 4, 11
The thermal expansion between them can be easily absorbed, and when the coupling boss 16 and the flange fitting portion are worn due to axial movement or the like, the coupling can be performed without correcting and replacing the output shaft 10 of the drive device 9. It is possible to replace only the boss 16 and the flange 15.

[0011]

As described above, according to the present invention, one of the fixed shaft couplings is provided between the drive unit and the bearing unit that supports the radial load and the thrust load of the stirring shaft, and one of the fixed shaft couplings is axially movable. By connecting with the output shaft of the drive,
By shortening the length of the stirring shaft at the top and lowering the height of the drive device at the top of the container to facilitate maintenance, leakage from the mechanical seal of the shaft seal due to movement of the stirring shaft is eliminated, and There is an effect that it can be used.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a drive unit for an agitator in which one of the fixed shaft couplings of one embodiment of the present invention uses a fixed shaft coupling that is axially movable.

FIG. 2 is a vertical cross-sectional view of a drive unit for an agitator using a fixed shaft joint in which a flange is fitted around the boss of a fixed shaft joint according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Shaft sealing part, 3 ... Stirring shaft, 4 ... Bearing, 5 ... Bearing box, 6 ... Bearing lid, 7 ... Lower fixed shaft coupling, 8 ... Upper fixed shaft coupling, 9 ... Drive device, 10 ... Output shaft, 11 ... Bearing, 1
2 ... reamer bolt, 14 ... key, 15 ... flange, 1
6 ... Coupling boss.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanobu Furukawa 794 Azuma Higashitoyo, Shimomatsu City, Yamaguchi Prefecture Stock company Hitachi Kasado Plant (72) Inventor Nao Kawamura 794 Azuma Higashitoyo, Kumamatsu City Yamaguchi Prefecture Stock Association Company Hitachi Ltd. Kasado Plant (72) Inventor Akira Matsumoto 794 Azuma Higashitoyo, Shimomatsu City, Yamaguchi Prefecture Hitachi Techno Engineering Co., Ltd. Kasado Plant (72) Inventor Shinichi Tamura 794 Azuma Higashitoyo, Shimomatsu City, Yamaguchi Prefecture Hitachi Techno Engineering Co., Ltd. Kasado Office

Claims (1)

[Claims] Claim: What is claimed is: 1. A fixed shaft coupling, one of which is axially movable, is provided between a drive unit and a bearing unit that supports a stirring shaft that penetrates a container, and a fixed device is provided with the fixed shaft joint through which the fixed shaft coupling is connected. A drive device for a stirrer, characterized in that an output shaft and a stirring shaft are connected.