JP2001224938A - Stirring shaft drive mechanism for vertical type stirring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring shaft drive mechanism which is mounted with a reducing gear with a motor on a stand in the upper part of a stirring tank, is extremely easy is disassembly on the occasion of internal inspection and repair and is reduced in man-hours for assembly and the number of parts in manufacture. SOLUTION: The stirring shaft driven mechanism of a vertical type stirring machine which supports and rotationally drives the stirring shaft projecting to the upper part of the stirring tank has the cylindrical stand disposed in the upper of the stirring tank, a mechanical seal section which is fastened to the pedestal in the upper part of the stirring tank within this stand and seals the stirring shaft, the reducing gear with the motor which is connected to the upper part of the stand, a cylindrical joint which is fitted to the output shaft of the reducing gear with the motor and the shaft end of the stirring shaft projecting upward from the mechanical seal section and connects both shafts and a radial bearing which is held in the upper part of the stand and pivotally supports the cylindrical joint. The mechanism is so constituted that the reducing gear with the motor, the radial bearing and the cylindrical joint are integrally separated from the shaft end of the stirring shaft by removing the radial bearing from the stand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical stirrer in which a stirring shaft protruding upward from a stirring tank is supported in a sealed state with respect to the stirring tank, and is rotationally driven by a motor disposed above the stirring tank. The present invention relates to a stirring shaft driving mechanism.

[0002]

2. Description of the Related Art In a vertical stirrer, a stirring shaft is usually arranged at the center of a cylindrical stirring tank, a stirring blade is attached to the stirring shaft, and a motor installed on a pedestal at the top of the tank via the stirring shaft. Thus, the liquid to be treated in the tank is stirred by rotating the stirring blade. Generally, the bottom of the stirring tank serves as an outlet for the liquid after the stirring process, so the lower end of the stirring shaft is not supported by the stirring tank, and the upper end of the stirring shaft is located at the upper part of the stirring tank. , And is cantilevered by the gantry and is connected to and driven by a motored reduction gear mounted on the upper portion of the stirring tank.

FIG. 3 is a longitudinal sectional view showing a stirring shaft support mechanism / drive mechanism at the upper part of a conventional vertical stirrer. An opening 3 from which the stirring shaft 2 protrudes is formed in the upper part of the cylindrical stirring tank 1, and a cylindrical base 5 extending upward through an upper pedestal 4 is fixed to the outside of the opening 3. The stirring shaft 2 extends from the inside of the tank through the opening 3 of the tank body into the gantry 5. A mechanical seal portion 6 is provided on the outer periphery of the stirring shaft 2 in the pedestal 5, and a lower end of the seal portion 6 is fixed to the pedestal 4. 3 and the agitating shaft 2 are prevented from entering the gantry 5. The mechanical seal portion 6 has a built-in thrust bearing.

A reduction gear 7 with a motor is mounted on the upper end of the gantry 5, and its output shaft 8 is connected to an intermediate shaft 10 via a chain coupling 9 and a key 20, and the lower end of the intermediate shaft 10 is a flange type shaft. It is connected to the shaft end 2a of the stirring shaft 2 protruding from the mechanical seal portion 6 via the joint 11. Reference numeral 21 denotes a key for connecting the flange type shaft coupling 11 and the shaft end 2a of the stirring shaft 2 so that they cannot rotate relative to each other. Intermediate shaft 1
Numeral 0 is axially supported by a radial bearing 12 held by a gantry 5. The reduction gear 7 also has a built-in radial bearing (not shown). The radial force of the shaft based on the stirring force during the stirring operation is mainly supported by the radial bearing 12 held by the gantry 5.

[0005]

SUMMARY OF THE INVENTION In this type of stirrer,
During operation, there is a need to disassemble and repair due to troubles in the tank or damage to parts in the gantry 5. In particular, the frequency of repairing the mechanical seal portion 6 that seals the inside of the tank 1 and the frame 5 is large. Even if there is no failure, it is necessary to periodically inspect each part inside. In such a case, the conventional stirrer as shown in FIG. 3 requires a great deal of time and labor for decomposition.
For example, the mechanical seal portion 6 is located at the lowermost portion in the gantry 5, and in order to remove the mechanical seal portion 6, it is necessary to sequentially remove the components above it together with many accompanying bolts.

FIG. 4 is a diagram showing an order of disassembly when the mechanical seal portion 6 is removed. As shown in this figure,
First, the chain coupling 9 is detached from the inspection window on the upper part of the gantry 5, the gantry 5 is separated into upper and lower parts 5a and 5b, and the gantry upper part 5a and the motored reduction gear 7 are integrated with the gantry lower part 5
b, then the intermediate shaft 10 is removed together with the radial bearing 12 from the flange-type shaft coupling 11, and after removing the flange-type shaft coupling 11, the mechanical seal part 6 is removed. This has led to a decrease in operating efficiency. The assembling process during the production of the stirrer also required much time and labor. In FIG. 4, reference numeral 22 denotes a key groove formed on the inner periphery of the flange type shaft coupling 11, which engages with the key 21 of the shaft end 2a of the stirring shaft 2.

The present invention provides a vertical stirrer in which a motor-equipped speed reducer is mounted on a pedestal at the top of a stirrer, in which internal disassembly for inspection and repair is extremely easy, and the number of assembling steps and the number of parts during manufacturing are reduced. An object of the present invention is to provide a stirring shaft drive mechanism that can be configured in a small size and in a compact form.

[0008]

According to the present invention, there is provided a stirring shaft driving mechanism for a vertical stirrer which is driven to rotate while supporting a stirring shaft protruding above the stirring tank, the mechanism being provided above the stirring tank. A cylindrical mount, a mechanical seal portion fixed to the upper pedestal of the stirring tank in the mount, and sealing the stirring shaft; a motored reducer connected to the upper portion of the mount; A tubular joint fitted to the output shaft of the reduction gear and a shaft end of the stirring shaft projecting upward from the mechanical seal portion to connect both shafts, and a tubular joint held at an upper portion of the gantry and having the tubular joint And a radial bearing to support,
Provided is a stirring shaft drive mechanism in which the radial bearing is removed from the machine frame, whereby the motored reduction gear, the radial bearing, and the cylindrical joint are integrally separated from the shaft end of the stirring shaft. Is done.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a stirring shaft drive mechanism of a vertical stirrer according to an embodiment of the present invention, and FIG. 2 illustrates a work procedure when inspecting and disassembling a mechanical seal portion of a stirring shaft in the stirrer shown in FIG. FIG. 4, the upper shaft end 2a of the stirring shaft 2 protrudes upward from the inside of the tank through the upper opening 3 of the cylindrical stirring tank 1, and a pedestal 4 of the stirring tank 1 is formed around the opening 3. Further, a cylindrical gantry 5 is attached to the upper surface of the pedestal 4. A mechanical seal portion 6 is mounted on the outer periphery of the stirring shaft 2 in the gantry 5.
Is fixed to the pedestal 4 with bolts 13, whereby the interior of the stirring tank 1 and the interior of the gantry 5 are sealed off. As shown, the upper shaft end 2a of the stirring shaft 2 protrudes above the mechanical seal portion 6.

A bearing box 16 containing a radial bearing 15 is detachably mounted on the upper end of the gantry 5 by bolts 17, and the reduction gear with motor 7 is mounted on the upper surface of the bearing box 16 by bolts 18. The output shaft 8 of the speed reducer 7 extends into the radial bearing 15 and is inserted into a hole at the upper end of a tubular joint 19 described later, and the output shaft 8 and the tubular joint 19 are rotationally connected by a key 23.

The upper part of the cylindrical joint 19 is the radial bearing 1.
5. The shaft end 2 a of the stirring shaft 2 is inserted into a hole at the lower part of the cylindrical joint 19. 25 is a cylindrical joint 1
9 is a key for rotatingly connecting the shaft end 9 with the shaft end 2a of the stirring shaft 2. The output shaft 8, the radial bearing 15, the cylindrical joint 19, and the stirring shaft 2 of the motored reduction gear 7 are arranged on the same axis, but as described above, the cylindrical coupling 19, the reduction gear output shaft 8, and the cylindrical coupling 19 are arranged. The agitating shaft 2 and the stirring shaft 2 are fitted to each other by means of a key or the like so that they cannot rotate relative to each other and can be inserted and removed in the axial direction. Therefore, the stirring shaft 2 is rotated via the tubular joint 19 by the driving of the motor, and the radial force of the stirring shaft 2 accompanying the stirring force is supported by the radial bearing 15 via the tubular joint 19.

When disassembling the mechanical seal portion 6 in the gantry 5 in such a configuration, the bolts 17 fixing the bearing box 16 to the gantry 5 are removed, and the motored reduction gear 7 is pulled up. As shown in FIG.
And the cylindrical joint 19 are also pulled up integrally, and the cylindrical joint 1
The lower part of 9 is withdrawn from the stirring shaft 2. Thereby, the mechanical seal portion 6 is exposed to the upper part of the pedestal 5, and the mechanical seal portion 6 can be pulled upward from the stirring shaft 2 by removing the bolt 13 that fixes the mechanical seal portion 6 to the pedestal 4. When removing the radial bearing 15, the radial bearing 15 can be easily separated from the speed reducer 7 by removing the bolt 18 between the speed reducer 7 and the bearing box 16 and removing the bearing inner ring stopper 21 from the cylindrical joint 19. .
In FIG. 2, reference numeral 26 denotes a key groove formed on the inner periphery of the cylindrical joint 19 which engages with the key 25.

[0013] The assembly of the stirring shaft drive mechanism may be performed by the reverse operation of the disassembly procedure described above. The radial bearing 15 housed in the bearing box 16 is assembled to the upper end of the cylindrical joint 19, and the output shaft 8 of the reduction gear with motor 7 is inserted into the upper end hole of the cylindrical joint 19 from above, and the reduction gear 7 and the bearing box are inserted. 16 is connected by bolts to prepare a reduction gear with a radial bearing external motor as shown in FIG. 2B, and the mechanical seal portion 6 is assembled to the stirring shaft 2 protruding above the stirring tank 1. After the seal portion 6 and the gantry 5 are bolted to the upper pedestal 4 of the stirring tank 1 to obtain the state shown in FIG. 2A, the bearing box 16 shown in FIG. 2B is bolted to the upper end of the gantry.

When a standard cyclo reduction gear (registered trademark of Sumitomo Heavy Industries, Ltd.) is used as the reduction gear with motor 7, for example, the radial bearing of the output shaft 8 incorporated in the reduction gear often has a stirring force. However, since the output shaft 8 is supported by the radial bearing 15 interposed between the output shaft 8 and the gantry 5, it is possible to sufficiently withstand a large stirring force of a large stirrer.
In addition, by directly assembling the radial bearing 15 directly below the speed reducer 7, the overall structure becomes compact and workability is improved.

[0015]

As described above, according to the present invention, parts other than the radial bearing and mechanical seal of the stirring shaft, which are indispensable for this type of vertical stirrer, are omitted as much as possible, and they (for example, chain coupling, The functions of the flange-type shaft coupling, etc.) are concentrated in a special cylindrical coupling supported by the radial bearing, so when disassembling the mechanical seal part, remove the bolts on the bearing box of the radial bearing and use the motor-equipped reducer. The seal can be inspected and dismantled simply by removing it from the pedestal above the stirring tank together with the cylindrical joint. The number of parts to be removed and bolts are greatly reduced as compared with the conventional case, so that the manufacturing and assembly are simple and the cost is reduced.
Since the intermediate shaft that connects the stirring shaft and the output shaft of the reducer is not required, the height of the pedestal on the pedestal is about 2/3 of the conventional height, making the whole compact, dismantling and assembling work faster and reducing labor. Is achieved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a stirring shaft drive mechanism of a vertical stirrer according to one embodiment of the present invention.

FIG. 2 is an exploded view for explaining an operation procedure when checking and disassembling a mechanical seal portion of a stirring shaft in the stirrer shown in FIG.

FIG. 3 is a longitudinal sectional view showing a stirring shaft driving mechanism at an upper part of a conventional vertical stirrer.

FIG. 4 is a diagram showing a disassembly order when a mechanical seal portion is removed by a conventional vertical stirrer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stirring tank 2 stirring shaft 3 opening 4 pedestal 5 gantry 6 mechanical seal part 7 reduction gear with motor 8 output shaft 15 radial bearing 16 bearing box 19 cylindrical joint 20, 21, 23, 25 key 22, 26 key groove

Claims (1)

[Claims] 1. A stirring shaft drive mechanism of a vertical stirrer which supports and rotates a stirring shaft protruding above an agitating tank, comprising: a cylindrical mount provided on an upper portion of the stirring tank; A mechanical seal portion fixed to the upper pedestal of the stirring tank and sealing the stirring shaft; a speed reducer with a motor connected to the upper portion of the gantry; an output shaft of the speed reducer with the motor and the mechanical seal portion A cylindrical joint fitted to the shaft end of the agitating shaft projecting upward and connecting the two shafts, and a radial bearing held at an upper portion of the gantry and supporting the cylindrical joint, By removing the radial bearing from the mount, the reduction gear with motor, the radial bearing, and the tubular joint are integrally separated from the shaft end of the stirring shaft, and the stirring shaft of the vertical stirrer is characterized in that: Drive mechanism.