JPS5940498B2 - Long shaft stirring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dissolving tank in which water is added to slaked lime to produce lime milk, and a stirring shaft device used in such a lime milk storage tank.

In the conventional stirring shaft device of this type, one stirring shaft a, which is joined with a joint in the middle as necessary, hangs down from the top surface IT of the tank as shown in FIG. 1 below and is placed on the bottom surface 18 of the tank. The structure is such that an upper bearing bl and a lower bearing b2 are supported on a bearing stand d, the bearings are sealed with a packing C, and a stirring blade is arranged between the bearings bl and b2.

However, the above-mentioned tanks are both large and small, for example, 12 m in diameter.
) It is something like 12 meters high.

Therefore, the stirring shaft is long. In addition, milk of lime is a suspended liquid of slaked lime powder, and the temperature difference between summer and winter is as much as 20°C, which tends to cause shaft vibration during stirring operations. In addition, milk of lime is corrosive to metals, which causes the bearing to be damaged within a very short period of time, in some cases within a week, and repair or replacement requires a great deal of labor and expense. The present invention aims to improve the above-mentioned problems, and is configured as set forth in the claims.

With this configuration, the drawbacks of the conventional device can be eliminated as described below.

The embodiments shown in the drawings will be described in detail below. A power shaft 1 linked to a power source is mounted on a leg stand 22 above the top IT of the tank.
The power transmission shaft 2 is connected to the lower end of the power shaft 1 in a fitting manner A, and the power transmission shaft 2 receives the power from the fixed base T. A fixed casing 8 hanging concentrically with the shaft 1 is supported by a bearing 6. In addition, there is a catch 21 on the bottom surface of the casing 8.
are fixed to receive the load of shafts 1 and 2. At the bottom of the power transmission shaft 2, there is provided a cylinder 9 for preventing lime milk from entering the cylindrical balancer/bearing 6 surrounding the outside of the lower part of the casing 8.
The lower part of the tank is fixed, and the opening of its upper surface is set so that it is above the liquid level even when the liquid level L in the tank is at its highest.

The bottom surface of the balancer 9 (or the bottom of the power transmission shaft 2)
The uppermost stirring shaft 3a connected by fitting B is suspended, and the second and third stirring shafts 3b and 3c of smaller diameter are successively fitted and connected C.
-D to connect stirring shafts of required length on the same axis.

Then, the stirring blade 10 is fixed to a desired position such as the stirring shaft on the lowest stage or the next upper stage. A pedestal 15 placed on the tank bottom 18
A load receiving center pedestal 14 is mounted on the top with bolts and nuts 16 so that the height can be adjusted freely, and a cemented carbide center 12 with a pointed top surface is housed in the hole via a pedestal 19 and a coil spring 13. Center piece 1 made of cemented carbide at the center 12
1 to support the lower end surface of the stirring shaft 3c.

20 is a centerpiece holding cylinder fixed to the lower end of the shaft 3c.

Note that although three stirring shafts 3a, 3b, and 3c are illustrated, as many as n required stirring shafts are used.

The above-mentioned fitting connection is one in which the upper and lower shafts having joint flanges are partially fitted and the flanges are bolted together to prevent the center axis from being misaligned. In the present invention, as described above, the power shaft 1 is located at the seat 21 on the lower surface of the casing 8 below (for example, 1.5 m) from the bearing position by the upper fixing base 7.
Since the stirring shaft a is supported via the power transmission shaft 2, there is no shaft vibration compared to the conventional stirring shaft a in which the entire weight is applied to the stand e.

The lower end of the stirring shaft is received by the center 12 and the center piece 11, and liquid enters the abutting portions to act as a lubricant, thereby preventing wear. When the shaft expands and contracts due to changes in temperature, etc., or changes in the vertical direction due to changes in load, the spring 13 dynamically absorbs and adjusts the force. That is, since the weight of the elongated shaft and the rotational force and load applied to the shaft are supported by bearings distributed at several locations, rotation is stable and high-speed rotation is possible. Furthermore, since a cylinder 9 is provided in the bearing part of the power transmission shaft 2 surrounding the casing 8 to prevent lime milk from entering the bearing, the bearing part is not damaged by liquid, and the cylinder 9 can also be used as a balancer. Therefore, the rotation of the long shaft is maintained smoothly, and the above points combine to increase the durability of the long stirring shaft, which is several meters long and used for dissolving milk of lime, stirring its storage tank, etc. It is something.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the device of the present invention in half sectional view, and FIG. 2 is a half sectional view of the lower part of the conventional device. 1 is a power shaft, 2 is a power transmission shaft, 3a to 3c are stirring shafts, 4
~6 is a bearing, 7 is a fixed base, 8 is a bearing support casing, 9
is a balancer, 10 is a stirring blade, 11 is a centerpiece, 1
2 is a center, 13 is a spring, 14 is a stand, 15 is a frame, 16 is an adjustment bolt, and A-D are connection parts.

Claims (1)

[Claims] 1. A power shaft is supported on a fixed base on the top surface of the tank, a power transmission shaft is fitted and connected to the lower end of the shaft, the upper end is fixed to the fixed base, and the power transmission shaft is supported on a hanging casing, and the above-mentioned A vertical load is applied to both shafts, and a cylindrical balancer and cylinder for preventing stirring liquid from entering into the power transmission shaft bearing is attached to the power transmission shaft surrounding the casing, and the uppermost stirring shaft is attached to the lower part of the power transmission shaft. Connect the stirring shafts by fitting them into the bottom, connect the required number of stirring shafts whose diameters gradually become smaller, and attach the stirring blade to one of the stirring shafts. A long stirring shaft device in which the lower end surface of the lowest stage stirring shaft is supported via a center piece by a center placed on a table via a spring.