JPS5847943Y2 - Tank bottom bearing in stirrer - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a tank bottom bearing in an agitator.

Generally, when attaching a stirrer to a stirring tank, if the stirring shaft is long, vibrations may occur in the shaft system.To prevent this, a tank bottom bearing is installed at the bottom of the tank to support the tip of the shaft. ing.

Figure 1 shows the structure of a conventional tank bottom bearing. A sleeve 2 is fixed to the tip of the stirring shaft 1 with a set screw 3, and a bearing box 4
It is supported by a journal bearing 5 that is fitted into and fixed to.

The bearing box 4 is fixed to the upper plate 7 of the pedestal 8 by bolts 13 through its flange portion 6, and the pedestal 8 is fixed to the lower plate 9 of the pedestal 8.
However, the bottom of the tank is fixed to the seat 10 with bolts 11.

By the way, the journal bearing 5 is made of a non-metallic material such as plastic rubber, so when it wears out and needs to be replaced, remove the set screw 12 and bolt 13, pull out the bearing box 4 downward, Replace with a new one.

In this case, the height h2 of the pedestal 8 needs to be greater than the length h2 of the bearing box 4.

That is, the longer the length t of the journal bearing, the higher the hl is required.

Since such a pedestal is installed below the sprouted stirring blade, the inside of the pedestal becomes a dead space for stirring, and slurry particles tend to accumulate on the iron part when stirring slurry.

In order to eliminate such drawbacks of the conventional structure, there has been a structure in which the journal bearing can be replaced from outside the stirring tank without the need for an operator to enter the tank.

However, the disadvantage of this conventional structure is that it requires at least a working hole at the bottom of the stirring tank that is larger than the bearing box, and that area must be reliably sealed, making the sealing structure complicated. It is what happens.

Furthermore, the structure of the bearing is also complicated and the overall cost is quite high.

The present invention takes into consideration the drawbacks of each conventional structure as described above,
The purpose is to enable the replacement work of bearings to be carried out easily and quickly by replacing the bearings in a tank.

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

In FIG. 2, 21 is a stirring tank, 22 is a motor, 23 is a stirring blade, and 24 is a relatively long stirring shaft. It is supported by a bottom bearing 26.

FIG. 3 ('!, shows the tank bottom bearing 26 in detail,
Reference numeral 21 denotes a cylindrical main body portion 28 and an annular flange portion 29, a bearing box, and 30 a collar presser consisting of a cylindrical portion 31 and an annular flange portion 32. The groove 33 is provided to prevent liquid from remaining inside the bearing A when the stirring tank 21 is emptied.

34 is a cylindrical space collar, and 35.35' is a cylindrical journal bearing made of rubber, plastic, etc. and divided into three equal parts.

36 is a sleeve fixed to the tip of the stirring shaft 24 by a hexagon socket set screw 37, and the head 38 of the set screw 37 is sunk into the sink hole of the sleeve 36.

Note that the hole diameter d2 of the bearing box 27 is large enough to allow the upper end (diameter d, ) of the sleeve 36 to pass through.

When this tank bottom bearing is mounted, the collar presser 30, space collar 34 and journal bearing 35.35' are stacked in this order above the seat 39, and then the bearing box 27 is covered from above. flange part 2
Insert and screw the cent bolts 40 into the holes 9 and 32, insert the tip of the stirring shaft 24 and the sleeve 36 from above the bearing box 21, and then insert the set screw 41 into the threaded hole provided in the main body part 28 of the bearing box 270. It is screwed on.

When the tank bottom bearing is in a centered state, the tip of the stirring shaft 24 is located above the lower surface of the flange portion 29 of the bearing box 2γ, and the collar presser 30 and space collar 34
The height of each journal bearing 35, 35' is made lower than the height from the bottom surface of the flange portion 29 to the tip of the stirring shaft 24, and a working space is formed between the tip of the stirring shaft 24 and the bottom surface of the flange portion 29. It is configured so that

Therefore, as shown in FIG. 3, the collar presser 30, the space collar 34, and the journal bearing 35, 35' are inserted into the bearing box 27 in a state where they are stacked in this order from below. is wedged between the sleeve 36 at the tip of the stirring shaft and the bearing box main body portion 28.

Next, when replacing journal bearing 35.35', 1
Loosen the screws 41 to release the center, then pull out the set bolts 40, and tighten the bearing box 27 so that the bottom surface of the flange portion 29 of the bearing box 2γ is at a height h above the top surface of the mounting seat 39. lift up.

In this case, the length may be slightly larger than the length of half of the journal bearing.

Thus, from the working space with the above clearance,
The collar presser 30 and the space collar 34 are taken out in sequence, the journal bearings 35 and 35' are taken out, a new journal bearing is inserted in the original position, and reassembly is carried out in the reverse order as described above.

Since the present invention has the above-mentioned configuration, it is relatively inexpensive and does not require a large working hole at the bottom of the stirring tank or a bearing with a complicated structure, unlike those in which journal bearings are replaced from outside the tank. However, the journal bearing can be replaced quickly and easily without the need to pull out the stirring shaft upward.

That is, the set screw 41. Loosen the set bolt 40,
By simply lifting the bearing box 2γ by an appropriate amount, a working space is formed therein, and replacement can be easily performed through this working space, so that handling is easy.

Furthermore, since there is no lower space in the conventional tank bottom bearing, there is no dead space for stirring, and there is no risk of accumulation of slurry particles.

Moreover, the present invention does not require a bulky frame like the conventional tank bottom bearing, is compact, has a simple structure, and can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional tank bottom bearing, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is an overall explanatory view, and Fig. 3 is a longitudinal sectional view of the tank bottom bearing. . 21... Stirring tank, 24... Stirring shaft, 2
6...Tank bottom bearing, 27...Bearing box, 2
8...Body part, 29...Flange part, 34...Space collar 35.35'...
...Journal bearing.

Claims (1)

[Scope of utility model registration request] A bearing box consisting of a cylindrical main body part and a flange part attached to the bottom of the stirring tank, a space collar and a collar presser fitted inside this bearing box, and an upper part of the space collar and a tip part of the stirring shaft. and a journal bearing disposed between the tip of the stirring shaft and the flange portion of the bearing box toward the tank bottom bearing configured to support the tip of the stirring shaft. With the tank bottom bearing set so that a working space is formed between the space collar and the collar presser, the tip of the stirring shaft is positioned above the lower surface of the flange portion of the bearing box, and the space collar and collar presser are In the agitator, the height is lower than the height of the working space, and the journal bearing is divided into three parts, and the height of each divided journal bearing is also lower than the height of the working space. Tank bottom bearing.