JP7253347B2 - How to remove the stirring shaft - Google Patents

Description

The present invention relates to the removal and installation of stirrer shafts in tanks used, for example, in the production of dairy products.

For example, in tanks used to manufacture dairy products, etc., in order to prevent contamination of bacteria and other foreign substances from the outside, between the stirring shaft that stirs the contents of the tank and the stirring motor that drives the stirring shaft, A mechanical seal is interposed.
From a sanitary point of view, the mechanical seal is subject to periodic inspection, and is removed from the tank during inspection. In addition, the mechanical seal must be removed from the tank when various problems (such as steam leakage) occur.
When removing the mechanical seal from the tank, it is necessary to separate the stirring shaft and the stirring motor output shaft which are connected by screwing, for example.

Here, many of the stirring shafts weigh about 100 kg, which is too heavy for a single operator to handle. Therefore, conventionally, about four workers enter the tank where the mechanical seal is to be removed, and the workers manually hold and rotate the stirring shaft to remove the stirring shaft from the output shaft of the stirring motor and the mechanical seal. were separated.
However, the work environment is very poor due to the multiple workers entering the narrow tank. The work of rotating and separating while holding the stirring shaft, which is a heavy object of about 100 kg, is a very dangerous work.
In addition, if the worker loses balance in the tank, there is a possibility that the stirring shaft that is being held will collide with the inner wall surface or the bottom surface of the tank, resulting in damage to the tank.
No effective solution has yet been proposed for such problems.

As another conventional technique, for example, a technique for removing the stirring blades of a large food stirring vessel has been proposed (see Patent Document 1), but this is not a technique for removing or attaching a stirring shaft, which is a heavy object of about 100 kg.

JP-A-11-197481

The present invention has been proposed in view of the above-mentioned problems of the prior art. a jig for removing the agitating shaft which can be held in place and can be rotated and separated, and which can prevent the agitating shaft from colliding with the inner wall surface or the bottom surface of the tank and damaging the tank during the work; An object of the present invention is to provide a method for removing and attaching a stirring shaft using such a jig.

The method for removing the stirring shaft of the present invention includes:
removing the bearing (5) below the stirring shaft (3);
The two divided halves (1-1, 1-2) are configured to be connectable to each other, and in a state where the halves (1-1, 1-2) are connected to each other (see FIG. 2), the stirring shaft (3) for removing the stirring shaft in which the through hole (1A) for the stirring shaft and the through hole (1B) for storing the column (4: the column for supporting the bearing) of the tank bottom (2A) are formed. The through hole (1A) for the stirring shaft of the jig (1: including those in which the two halves are joined at one end and the one in which the stirring shaft damage prevention ring is placed) is Align with the stirring shaft (3), align the strut through hole (1B) with the strut (4) of the tank bottom (2A), and the half part (1-1, 1-2) a step of connecting and holding each other (for example, with bolts and nuts);
A step of arranging a jack (J) in a region immediately below the jig for removing the stirring shaft (1);
A step of raising the jack (J), and a step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) in a state where the jig for removing the stirring shaft (1) is arranged, or the stirring a step of supporting the lower end (3E) of the stirring shaft (3) with a jack (J) via the stirring shaft removing jig (1) in a state where the shaft removing jig (1) is arranged;
While lowering the stirring shaft (3) with a jack (J), the stirring shaft (3) is rotated relative to the output shaft of the rotary drive source (M: stirring motor) to rotate the stirring shaft (3) and the output shaft. It is characterized by having a step of releasing the screwing with.

In the method for removing the stirring shaft of the present invention, the upper part of the stirring shaft (3) is supported (for example, , the stirring shaft 3 is preferably supported at three points in the circumferential direction.
Further, in the stirring shaft removing method of the present invention, the width dimension of the top plate-shaped member (JA: member that contacts the stirring shaft removing jig 1: jig gripping portion) is equal to the width of the stirring shaft removing jig (1) , and both ends of the jig gripping portion (JA) (both ends in the width direction of the jig for removing the stirring shaft 1) are bent. (J) is preferably used.
The stirring shaft removing jig (1) used in the present invention is
In the stirring shaft removal jig (1) used for removing the stirring shaft (3) in the tank (2) (used for producing dairy products, etc., for example),
The two divided half parts (1-1, 1-2) are configured to be connectable,
In the state in which the half parts (1-1, 1-2) are joined together (see FIG. 2), the through hole (1A) for the stirring shaft (1A) for accommodating the stirring shaft (3) and the column of the tank bottom (2A) It is preferable that a column through-hole (1B) for accommodating (4: a column for bearing support) is formed.
In the jig for removing the stirring shaft (1), the two half parts (1-1, 1-2) are joined at one end so that the half parts (1-1, 1-2) are It is preferably configured to be unfoldable and connectable.
Further, it is preferable that a ring for preventing damage to the stirring shaft (3) is mounted on the through hole (1A) in which the stirring shaft (3) is housed (above) on the side of the stirring shaft (3).

The stirring shaft attachment method of the present invention includes:
While raising the jack (J) supporting the stirring shaft (3) by the method of removing the stirring shaft (including the method of removing the stirring shaft that supports the upper part of the stirring shaft), the stirring shaft (3) is moved to the stirring motor (M ) to screw together the stirring shaft (3) and the output shaft of the stirring motor (M);
A step of removing the jack (J) from below the jig for removing the stirring shaft (1) after the stirring shaft (3) and the stirring motor (M) are screwed together;
The two divided halves (1-1, 1-2) are configured to be connectable to each other, and in a state where the halves (1-1, 1-2) are connected to each other (see FIG. 2), the stirring shaft (3) for removing the stirring shaft in which the through hole (1A) for the stirring shaft and the through hole (1B) for storing the column (4: the column for supporting the bearing) of the tank bottom (2A) are formed. A jig (1: including one in which the two halves are joined at one end, and one on which the stirring shaft damage prevention ring is placed) (unscrew the bolt and nut) and
And, it is characterized by having a step of removing the jig (1) for removing the stirring shaft from the support (4) of the tank bottom (2A) and the stirring shaft (3).

In the agitation shaft mounting method of the present invention , the agitation shaft upper support member (6: for example, a rope which is a strip material having flexibility; It is preferable to have a step of removing metal or resin instruments, etc.) from the stirring shaft (3) .

According to the present invention having the above configuration, when removing the stirring shaft (3), if the bearing (5) below the stirring shaft (3) is removed, the jig (1) for removing the stirring shaft (1) is removed. The lower end of the stirring shaft (3) is held (supported) by a jack (J) in the arranged state. Here, since the agitation shaft removal jig (1) integrally holds the agitation shaft (3) and the support post (4) for supporting the bearing (5), the bearing (5) for supporting the lower end of the agitation shaft The stirring shaft (3) is stably held even when the is removed.
In this state, while lowering the stirring shaft (3) with the jack (J), the stirring shaft (3) is rotated relative to the output shaft of the rotary drive source (M: stirring motor) to rotate the stirring shaft (3). and the output shaft (the output shaft of the stirring motor M) are unscrewed, the stirring shaft (3) and the output shaft are separated, and the mechanical seal (MS) can be removed from the tank (2).

Here, since the stirring shaft (3) is supported by the jack (J) with the jig for removing the stirring shaft (1) placed thereon, there is no need for the worker to lift and support the stirring shaft (3). do not have.
Even a single operator can rotate the stirring shaft (3) (rotate relative to the output shaft of the rotary drive source M), and the jack (J) can be lowered and raised. Can be done by a single operator.
Therefore, according to the present invention, removal of the stirring shaft (3), which was performed by a plurality of workers in the prior art, can be performed by a single worker.

While the mechanical seal (MS) is removed from the tank (2) and necessary inspection, repair, and other maintenance work is being performed, the stirring shaft (3) is in a state where the stirring shaft removal jig (1) is arranged. is stably supported by a jack (J).
When screwing the stirring shaft (3) again to the output shaft of the rotary drive source (M: stirring motor), the stirring shaft (3) is jacked (J ), the jack (J) is gradually raised, and the worker moves the stirring shaft (3) relative to the output shaft of the stirring motor (M: see FIG. 1). to screw the stirring shaft (3) and the output shaft of the stirring motor (M).
If the agitation shaft (3) and the agitation motor (M) are completely screwed together, the agitation shaft (3) will not fall, so the jack (J) is placed below the agitation shaft removal jig (1). remove from

Then, the stirring shaft removing jig (1) is unfolded, the stirring shaft removing jig (1) is removed from the support (4) and the stirring shaft (3), and the bearing (5) is attached to the lower end of the stirring shaft (3). ) is installed and the bearing (5) is supported by the support (4), the stirring shaft (3) is attached.

It is an explanatory view showing an example of a tank to which an embodiment of the present invention is applied. FIG. 4 is an explanatory perspective view showing a jig for removing the stirring shaft according to the embodiment; FIG. 4 is a plan view showing a first modification of the jig for removing the stirring shaft according to the embodiment; FIG. 9 is a plan view showing a second modification of the jig for removing the stirring shaft according to the embodiment; FIG. 4 is a process diagram showing one process of the method for removing the stirring shaft according to the embodiment. FIG. 6 is a process drawing showing a process following FIG. 5 ; FIG. 4 is a plan view showing a scratch-preventing mat placed directly below the stirring shaft; FIG. 7 is a perspective view showing a state in which the scratch prevention mat is arranged directly below the stirring shaft, and is an explanatory view different from FIG. 6 . FIG. 10 is an explanatory diagram showing a state in which the support and the stirring shaft are aligned with the through-hole of the developed stirring shaft removing jig. FIG. 4 is a process diagram showing a process of closing the jig for removing the stirring shaft. It is a process drawing which shows the process which arrange|positions a jack directly under the jig|tool for stirring shaft removal. It is process drawing which shows the process which lowers the jack arrange|positioned directly under the jig|tool for stirring shaft removal. FIG. 13 is an explanatory diagram showing a state in which the stirring shaft is supported by a jack, showing a mode of supporting the stirring shaft different from that in FIG. 12 ; FIG. 13 is an explanatory view showing a mode of supporting a stirring shaft different from the stirring shafts shown in FIGS. 1 to 12; It is explanatory drawing regarding the jig|tool holding|grip part of the jack used by embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
A tank 2 to which the illustrated embodiment applies is shown in FIG.
In FIG. 1, a tank 2 used for producing dairy products, for example, contains a stirring shaft 3 for stirring contents. A plurality of (two blades in FIG. 1) stirring blades 3A are attached to the stirring shaft 3 in the axial direction (vertical direction in FIG. 1).
The stirring shaft 3 is heavy (for example, about 100 kg), and the lower end of the stirring shaft 3 is rotatably supported by a bearing 5 so that the stirring shaft 3 does not drop to the bottom surface 2A of the tank 2. The bearing 5 is supported by two pillars 4 (bearing supporting pillars) fixed to the tank bottom surface 2A.

A stirring motor M for rotationally driving a stirring shaft 3 is arranged near the center in the radial direction in the upper part of the tank 2 . Although not shown in FIG. 1, the output shaft of the stirring motor M has a male thread, and the upper end of the stirring shaft 3 is formed with a blind hole having a female thread. The output shaft of the stirring motor M and the stirring shaft 3 are connected by screwing the male thread of the output shaft into the female thread of the upper end of the stirring shaft 3 .
Depending on the stirring tank, the output shaft of the stirring motor M may be formed with a blind hole having a female screw, and the upper end of the stirring shaft 3 may be provided with a male screw.

A mechanical seal MS is interposed between the stirring shaft 3 and the stirring motor M. The mechanical seal MS is not particularly limited, and conventionally known commercial products can be applied.
The mechanical seal MS needs to be removed from the tank 2 during periodic inspection or repair of the mechanical seal MS. Here, although not clearly illustrated, in order to remove the mechanical seal MS from the tank 2, the male screw on the output shaft side of the stirring motor M and the female screw on the stirring shaft 3 side are unscrewed, The output shaft of the stirring motor M and the stirring shaft 3 must be separated.

FIG. 2 shows the stirring shaft removing jig 1 according to the illustrated embodiment.
In FIG. 2, the stirring shaft removing jig 1 can be divided into two half parts 1-1 and 1-2. are connected by a hinge portion 1C arranged in the portion, and thus the half portions 1-1 and 1-2 are configured to be able to be in an unfolded (opened) state and a connected state. there is A clamp (not shown) is arranged opposite to the surface on which the hinge portion 1C is arranged. FIG. 2 shows a state in which the half bodies 1-1 and 1-2 are joined together.
The material that constitutes the jig for removing the stirring shaft 1 (half parts 1-1 and 1-2) may have a buffering function to the extent that the stirring shaft 3 (FIG. 1) is not damaged and the strength to hold the stirring shaft 3. It is a flexible material, and for example, polyacetal resin (POM) (Delrin: registered trademark) made from formaldehyde can be applied.
Moreover, the size of the jig 1 for removing the stirring shaft may be appropriately set according to the size of the stirring tank and the stirring shaft 3 . In particular, it is preferable that the long side (L direction in FIG. 2) is 200 to 500 mm, the short side (B direction in FIG. 2) is 50 to 150 mm, and the height is 60 to 150 mm.

In the state where the half bodies 1-1 and 1-2 are joined together (the state shown in FIG. 2), the stirring shaft 3 is attached to the jig for removing the stirring shaft 1 (the half bodies 1-1 and 1-2). A through hole 1A for a stirring shaft to accommodate and a through hole 1B (two places) for accommodating a column 4 (a column for bearing support, FIG. 1) fixed to the tank bottom 2A are formed. The stirring shaft through-hole 1A and the support through-hole 1B extend in the vertical direction (vertical direction in FIG. 2) at the time of installation (see FIGS. 9 and 10).
The inner diameter of the stirring shaft through-hole 1A is set so that the stirring shaft 3 is rotatable but not biased. On the other hand, the inner diameter dimension of the through-hole 1B for support is formed to a dimension that allows the support 4 to be properly held with little rattling. Note that the stirring shaft through-hole 1A and the strut through-hole 1B do not need to be independent, and as long as the stirring shaft 3 and the strut 4 can be held as described above, there is no problem even if a part of the through-hole is connected. do not have.

Further, a bolt through-hole 1D is formed in the stirring shaft removing jig 1 (half bodies 1-1 and 1-2), and the half bodies 1-1 and 1-2 are joined together. In the state shown in FIG. 2, the bolt through hole 1D extends in the width direction of the stirring shaft removing jig 1 (in the direction of arrow B in FIG. 2).
In FIG. 2, the bolt through-holes 1D are formed at two locations near the hinge portion 1C side end portion of the stirring shaft removing jig 1 and near the opposite end portion from the hinge portion 1C side. The number of through-holes 1D is not limited to two. For example, the bolt through hole 1D near the end on the hinge portion 1C side can be omitted.
In a state where the half parts 1-1 and 1-2 are joined together, a bolt (not shown) is inserted into the bolt through-hole 1D of the jig for removing the stirring shaft 1, and a nut (not shown) is screwed together to perform stirring. The half parts 1-1 and 1-2 of the shaft removing jig 1 can be securely connected to each other, and the stirring shaft 3 and the strut 4 can be properly held.
Although FIG. 2 shows an example in which the half bodies 1-1 and 1-2 are connected by the hinge portion 1C arranged at one end of each, the hinge portion 1C can be omitted. be. In that case, the half parts 1-1 and 1-2 which do not have the hinge part 1C can be fixed only by bolts and nuts inserted through the bolt through-holes 1D.

Although not shown in FIG. 2, above the stirring shaft through-hole 1A into which the stirring shaft 3 of the stirring shaft removing jig 1 is inserted (on the stirring shaft 3 side), for example, a fluorine resin (Teflon: registered trademark) A ring (ring for preventing damage to the stirring shaft) can be placed to prevent damage to the stirring shaft 3 .
In addition, when removing or attaching, if the lowermost stirring blade in the vertical direction (vertical direction in FIG. 1) interferes with the stirring shaft removing jig 1, the longitudinal direction of the stirring shaft removing jig 1 ( The interference can be avoided by chamfering both ends (in the direction of arrow L in FIG. 2).

In FIG. 2, the stirring shaft through-hole 1A and the two strut through-holes 1B are separated from each other and do not communicate with each other. In other words, the stirring shaft through-hole 1A and the two strut through-holes 1B are independent of each other. However, the stirring shaft through-hole 1A and the two strut through-holes 1B are not limited to being independent of each other.
As shown in the modified example of FIG. 3, if the stirring shaft 3 and the strut 4 can be held, the stirring shaft through hole 1A and the strut through hole 1B may be communicated with each other through a communication groove 1t1.

In FIG. 2, the stirring shaft through-hole 1A and the support through-hole 1B are both circular cross-sectional through-holes. Here, the support 4 is fixed to the tank bottom surface 2A. Therefore, as long as the relative positions of the stirring shaft 3 and the support 4 can be maintained, the cross section of the support through hole 1B need not be circular (1Bh ), the jig 1 does not have to surround the column 4 completely.

Next, a method for removing the stirring shaft 3 according to the embodiment will be described with reference to FIGS. 5 to 15. FIG.
First, as shown in FIG. 5, the upper portion of the stirring shaft 3 is fixed to the tank 2 by a flexible stirring shaft upper supporting member 6 such as a rope. When the stirring shaft upper support member 6 is used to fix the stirring shaft 3, it is preferable to support the stirring shaft 3 on the inner peripheral surface of the tank 2 at three points in the circumferential direction (three-point support). Here, the upper part of the stirring shaft 3 may be fixed to the tank 2 by means of a metal or resin instrument or the like instead of the rope 6, which is a strip material having flexibility. In this specification, flexible ropes, metal or resin instruments, and the like may be collectively referred to as "stirring shaft upper support member" and denoted by reference numeral 6 in some cases.
Then, as shown in FIG. 6, the bearing 5 supporting the lower end side of the stirring shaft 3 is removed from the column 4 . In the state shown in FIG. 6, the female thread formed in the blind hole at the upper end of the stirring shaft 3 is screwed with the male thread formed in the output shaft of the stirring motor M. Coupled with the output shaft. In addition, since the top of the stirring shaft 3 is fixed to the tank 2 by the stirring shaft upper supporting member 6 by the process of FIG. It is
Here, it is possible to omit the step shown in FIG. 5 (the step of supporting the upper portion of the stirring shaft 3 with the stirring shaft upper support member 6).

In the process shown in FIG. 6, a scratch prevention mat 7 (see FIG. 7) is arranged on the bottom surface 2A of the tank directly below the stirring shaft 3. As shown in FIG. The anti-scratch mat 7 is arranged to prevent the tank bottom surface 2A from being damaged when a jack J, which will be described later, is installed.
The anti-scratch mat 7 is arranged in the area directly below the stirring shaft 3 and between the two pillars 4 . As shown in FIG. 7, the anti-scratch mat 7 is formed with recesses 7A for preventing interference with the struts 4 so that the anti-scratch mat 7 does not interfere with the struts 4. As shown in FIG.
The anti-scratch mat 7 is preferably made of rubber, for example. This is because when a jack J, which will be described later, is arranged, it is possible to prevent the jack J from slipping.

In FIG. 8, which is a perspective view showing the state in which the scratch-preventing mat 7 is arranged directly under the stirring shaft (FIG. 6), the region directly under the stirring shaft 3 and between the two pillars 4 is scratched. Even if the anti-scratch mat 7 is arranged, interference between the post 4 and the anti-scratch mat 7 can be avoided by the concave portion 7A.
Then, as shown in FIG. 9, the lower end of the stirring shaft 3 is fitted (aligned) with the stirring shaft through-hole 1A of the stirring shaft removing jig 1, and the two pillars 4 are connected to the stirring shaft removing jig 1. The jig 1 for removing the stirring shaft is arranged so as to be fitted (aligned) with the through-hole 1B for the support. In FIG. 9, the stirring shaft removing jig 1 is in a state in which the half parts 1-1 and 1-2 are unfolded (opened) around the hinge part 1C (see FIG. 2).
Next, after connecting the jig for removing the stirring shaft 1 with a clamp arranged opposite to the hinge portion 1C (not shown), as shown in FIG. 2) is inserted into the bolt BT and screwed with a nut (not shown). As a result, the half parts 1-1 and 1-2 of the jig for removing the stirring shaft 1 are joined together, and the jig for removing the stirring shaft 1 in the unfolded state shown in FIG. , 1-2 from the expanded state to the closed state. This completes the installation of the jig 1 for removing the stirring shaft.

In the next step shown in FIG. 11, a jack J is inserted (inserted in the direction of arrow I in FIG. 11) into the region below the jig 1 for removing the stirring shaft.
Then, the jack J is lifted (arrow U in FIG. 11) to approach (abut) the lower end of the stirring shaft removing jig 1, and when the jack J is further lifted, the jack J grips the jig described later. The portion JA abuts on the lower end of the stirring shaft 3, and the lower end of the stirring shaft 3 is supported by the jack J (the state shown in FIG. 12). A step of supporting the lower end of the stirring shaft 3 with a jack J).
Alternatively, the jack J is raised (arrow U in FIG. 11) to abut on the lower end of the jig 1 for removing the stirring shaft, and by further raising the jack J, through the jig 1 for removing the stirring shaft , the lower end of the stirring shaft 3 is supported by the jack (with the jig for removing the stirring shaft 1 placed, the lower end of the stirring shaft 3 is supported by the jack J via the jig for removing the stirring shaft). supporting process).
Even when the jig gripping portion JA, which will be described later, of the jack J is in contact with the lower end of the stirring shaft 3, the lower end of the stirring shaft 3 is supported by the jack via the stirring shaft removing jig 1. Even so, the lower end of the stirring shaft (3) is supported by a jack (J) with the jig for removing the stirring shaft (1) placed thereon.

In the process shown in FIG. 11, if the lower end of the stirring shaft 3 is supported by the jack J, as shown in FIG. (See FIG. 1), and gradually disengage the agitation shaft 3 from the output shaft of the agitation motor M. Remove from
When the stirring shaft 3 is removed from the output shaft of the stirring motor M, the stirring shaft 3 and the strut 4 (supporting strut for bearing) are integrally held by the stirring shaft removing jig 1 . Therefore, even if the bearing 5 for supporting the lower end of the stirring shaft is removed, the jig for removing the stirring shaft 1 is supported on the bottom surface 2A of the tank via the support 4, and the stirring shaft 3 maintains its vertically extended state. , is stably held on the jack J. Therefore, the operation of rotating the stirring shaft 3 relative to the output shaft of the stirring motor M while lowering the stirring shaft 3 with the jack J can be easily performed by a single operator.
5, the upper part of the stirring shaft 3 is supported (or fixed) by the stirring shaft upper supporting member 6 (for example, a rope), so that the stirring shaft 3 is maintained in a vertically extending state. be.

In FIG. 12, the lower end 3E of the stirring shaft 3 abuts on the jack J, thereby holding the stirring shaft 3. The step of supporting the lower end (3E) with a jack (J)”.
On the other hand, as shown in FIG. 13, when the diameter of the stirring shaft 3 is reduced in the vicinity of the jig 1 to form a stepped portion, the stepped portion 3S comes into contact with the upper surface of the jig 1. , the lower end 3E of the stirring shaft 3 does not come into contact with the jack J due to the reaction force (the reaction force against the gravity of the stirring shaft 3) acting on the stepped portion 3S of the upper surface 1U of the jig 1. There are also cases where the axis 3 is retained. The mode of holding shown in FIG. It falls under the “process supported by”.

5 to 12, the stirring shaft 3 is illustrated as having the same diameter, but there are cases where the diameter of the stirring shaft 3 varies near the jig 1 as shown in FIG. FIG. 14 shows in detail how the stirring shaft 3 is held when the diameter of the stirring shaft 3 fluctuates in the vicinity of the jig 1 .
In FIG. 14A, the diameter of the stirring shaft 3 is reduced in the vicinity of the jig 1 to form a stepped portion 3S. In FIG. 14A, as in FIG. 13, the lower end 3E of the stirring shaft 3 does not come into contact with the jack J, and friction between the stirring shaft 3 and the inner peripheral surface of the stirring shaft through hole 1A of the jig 1 is shown. The stirring shaft 3 is held by . Fig. 14(A) also shows that "with the jig for removing the stirring shaft (1) arranged, the lower end (3E) of the stirring shaft (3) is supported by the jack (J) via the jig for removing the stirring shaft. It corresponds to "the process to carry out In FIG. 14A, the stepped portion 3S is not in contact with the jig 1 upper surface 1U.
On the other hand, in FIG. 14B, the stirring shaft 3 is held by the lower end 3E of the stirring shaft 3 coming into contact with the jack J as in FIG. FIG. 14(B) corresponds to "the step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) while the jig for removing the stirring shaft (1) is arranged". In FIG. 14B as well, the stepped portion 3S is not in contact with the jig 1 upper surface 1U.

In FIG. 14C, similarly to FIG. 13, the lower end 3E of the stirring shaft 3 is not in contact with the jack J, but the stepped portion 3S is in contact with the jig 1 upper surface 1U. The stirring shaft 3 is held by the reaction force (the reaction force against the gravity of the stirring shaft 3) that the upper surface 1U of the jig 1 acts on the stepped portion 3S. Also in this case, "the step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) via the stirring shaft removing jig (1) in a state where the stirring shaft removing jig (1) is arranged) ”.
In FIG. 14D, the lower end 3E of the stirring shaft 3 is in contact with the jack J, and the stepped portion 3S is in contact with the jig 1 upper surface 1U. A lower end 3E of the stirring shaft 3 is supported by a jack J, and a reaction force against the gravity of the stirring shaft 3 from the upper surface 1U of the jig 1 acts on the stepped portion 3S to hold the stirring shaft 3. As shown in FIG. In the case of FIG. 14(D), the lower end (3E) of the stirring shaft (3) is jacked (J) through the stirring shaft removing jig (1) while the stirring shaft removing jig (1) is placed. support)” and “the step of supporting the lower end (3E) of the stirring shaft (3) with a jack (J) in a state where the jig for removing the stirring shaft (1) is arranged”.
In FIGS. 14A to 14D, only the jig holding portion JA (see FIG. 15) of the jack J is shown.

As shown in FIG. 15, in the jack J (FIGS. 11 and 12) used in the illustrated embodiment, a plate-like member JA (a member in contact with the stirring shaft removing jig 1: a jig gripping portion ) has a width dimension B1 slightly larger than the width direction (direction of arrow B in FIG. 2) of the stirring shaft removing jig 1 so that the stirring shaft removing jig 1 can be securely held. The widthwise end of the stirring shaft removing jig 1 of the tool gripping portion JA is bent to form a bent portion JAA.
This is to ensure that the jig 1 for removing the stirring shaft is supported (grasped) by the jig gripping portion JA and to prevent the jig 1 for removing the stirring shaft from coming off the jig gripping portion JA.

After separating the stirring shaft 3 from the output shaft of the stirring motor M in this manner, the mechanical seal MS (FIG. 1) can be removed from the tank 2 for inspection, repair, replacement, and other necessary maintenance work. . During this time, the stirring shaft 3 is stably placed on the jack J while extending in the vertical direction with the stirring shaft removing jig 1 placed thereon, as described above with reference to FIG. In other words, the stirring shaft 3 is stably supported in the vertical direction by the jack J via the jig 1 for removing the stirring shaft.
After that, after the mechanical seal MS is attached to the tank 2, the stirring shaft 3 is screwed (connected) to the output shaft of the stirring motor M again.
During maintenance work after removing the mechanical seal MS, the stirring shaft 3 is again screwed (connected) to the output shaft of the stirring motor M, and when the mechanical seal MS is installed, the stirring shaft 3 is again connected to the stirring motor. It can also be separated from the output shaft of M.

Next, a method of screwing (connecting) the stirring shaft 3 to the output shaft of the stirring motor M again, that is, a method of attaching the stirring shaft according to the embodiment will be described.
When screwing the stirring shaft 3 onto the output shaft of the stirring motor M again, the stirring shaft 3 is screwed through the stirring shaft removing jig 1 in the state shown in FIG. The jack J, which is supported while extending in the vertical direction, is gradually raised (arrow U in FIG. 12). Then, the stirring shaft 3 is rotated relative to the output shaft of the stirring motor M in the direction in which the stirring shaft 3 is screwed to the output shaft of the stirring motor M (see FIG. 1), and the stirring shaft 3 and the stirring shaft 3 are gradually stirred. The output shaft of the motor M is screwed.
After the stirring shaft 3 and the output shaft of the stirring motor M are screwed together, the jack J is removed (removed) from below the stirring shaft removing jig 1 (arrow O in FIG. 11).

In the jig for removing the stirring shaft 1 in which the half parts 1-1 and 1-2 are joined together (closed state) shown in FIG. The bolt BT inserted through the shaft is unscrewed from a nut (not shown), the bolt BT is pulled out, and the stirring shaft removing jig 1 is unfolded (opened) to obtain the state shown in FIG. That is, the fitting (alignment) between the two support columns 4 and the support through hole 1B of the stirring shaft removing jig 1 is released, and the stirring shaft 3 and the stirring shaft through hole 1A of the stirring shaft removing jig 1 are aligned. Release the mating (alignment).
Then, the jig 1 for removing the stirring shaft is removed from the support 4 and the stirring shaft 3 of the tank bottom 2A (see FIG. 6).

Next, the anti-scratch mat 7 placed on the bottom surface 2A of the tank directly below the stirring shaft 3 is removed. Then, the bearing 5 is installed on the support column 4 for supporting the bearing, and the bearing 5 supports the lower end of the stirring shaft 3 (state shown in FIG. 5).
Further, the stirring shaft upper supporting member 6 (a rope-like string-shaped metal or resin instrument, etc.) attached to the upper portion of the stirring shaft 3 is removed. If the step shown in FIG. 5 is omitted when removing the stirring shaft 3, the operation of removing the stirring shaft upper support member 6 is unnecessary.
As a result, the stirring shaft 3 and the output shaft of the stirring motor M are connected, and the mounting work of the stirring shaft 3 is completed (state shown in FIG. 1).

According to the embodiment of the present invention, when the stirring shaft 3 is removed, the lower end of the stirring shaft 3 is held (supported) by the jack J while the stirring shaft removing jig 1 is arranged. Here, since the stirring shaft removing jig 1 integrally holds the stirring shaft 3 and the support pillar 4 for supporting the bearing, even when the bearing 5 for supporting the lower end of the stirring shaft is removed, the stirring shaft 3 can still be removed. is stably held by a jack J while extending vertically. If the top of the stirring shaft 3 is fixed to the tank 2 by a stirring shaft top supporting member 6 (such as a rope or other device), the stirring shaft 3 is more stably held in a vertically extended state. .
Furthermore, since the width direction end portion of the stirring shaft removing jig 1 of the jig gripping portion JA of the jack J is bent, the jig gripping portion JA securely supports (holds) the stirring shaft removing jig 1. can do

When the stirring shaft 3 and the bearing support column 4 are integrally held by the stirring shaft removing jig 1, the bolt BT is inserted into the bolt through hole 1D of the stirring shaft removing jig 1 and screwed with a nut. By doing so, the half parts 1-1 and 1-2 of the jig for removing the stirring shaft 1 can be securely connected.
In this state, the stirring shaft 3 is lowered by the jack J, and the stirring shaft 3 is rotated relative to the output shaft of the stirring motor M to release the screwing between the stirring shaft 3 and the output shaft of the stirring motor M. For example, the stirring shaft 3 and the output shaft of the stirring motor M are separated, and the mechanical seal MS can be removed from the tank 2.
Further, since the scratch prevention mat 7 is arranged on the tank bottom surface 2A directly below the stirring shaft 3, the tank bottom surface 2A can be prevented from being damaged when the jack J is installed.

Here, since the stirring shaft 3 is stably extended in the vertical direction by the jack J in a state where the stirring shaft removing jig 1 is arranged, the stirring shaft 3 can be removed by (a plurality of) workers. need not be lifted and supported.
Even a single operator can lower the jack J and rotate the stirring shaft 3 relative to the output shaft of the stirring motor M.
Therefore, according to the illustrated embodiment, removal of the stirring shaft 3, which was performed by a plurality of workers in the prior art, can be performed by a single worker.

While the mechanical seal MS is removed from the tank 2 and necessary inspection, repair, replacement, and other maintenance work is being performed, the stirring shaft 3 is stably supported by the jack J via the stirring shaft removal jig 1. ing.
When screwing the stirring shaft 3 onto the output shaft of the stirring motor M again, the stirring shaft 3 is supported by the jack J while stably extending in the vertical direction while the stirring shaft removing jig 1 is arranged. Therefore, while gradually raising the jack J, the stirring shaft 3 is rotated relative to the output shaft of the stirring motor M, and the stirring shaft 3 and the output shaft of the stirring motor M are screwed together. The work of gradually raising the jack J and rotating the stirring shaft 3 relative to the output shaft of the stirring motor M can also be performed by a single operator.
When the stirring shaft 3 and the stirring motor M are completely screwed together, the stirring shaft 3 is no longer likely to fall, and the jack J is removed from below the stirring shaft removing jig 1 .

Then, the stirring shaft removing jig 1 is unfolded (opened), the stirring shaft removing jig 1 is removed from the bearing supporting column 4 and the stirring shaft 3, and placed on the tank bottom surface 2A directly below the stirring shaft 3. Remove the placed scratch prevention mat 7.
Furthermore, a bearing 5 is installed at the lower end of the stirring shaft 3 and supported by a support column 4 . If the stirring shaft upper support member 6 is attached to the upper part of the stirring shaft 3 when the stirring shaft 3 is removed, the mounting operation of the stirring shaft 3 is completed by removing the stirring shaft upper supporting member 6 .

In the illustrated embodiment, a mechanical jack J is used to lower or raise the stirring shaft 3 while supporting the lower end of the stirring shaft 3 via the jig 1 for removing the stirring shaft.
However, in place of the mechanical jack J, it is possible to use a cushion member that can be expanded and compressed by supplying and discharging a working fluid (for example, air or oil) to change its thickness. In that case, a working fluid source, a working fluid circuit for communicating the cushion member and the working fluid source, a pump for pressurizing and supplying the working fluid to the working fluid circuit, and an on-off valve are required. That is, a single operator operates the on-off valve to adjust the supply and discharge of the working fluid to and from the cushion member, thereby adjusting the thickness dimension of the cushion member, and the jig for removing the stirring shaft by the cushion member. The stirring shaft 3 can be lowered or raised while supporting the lower end of the stirring shaft 3 in a state in which 1 is attached.

It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention.

Reference numerals 1... Jig for removing stirring shaft 1-1, 1-2... Half part 1A... Through hole for stirring shaft 1B... Through hole for strut 2... Tank 2A... Tank Bottom part 3... Stirring shaft 4... Strut (strut for bearing support)
5: Bearing 6: Strip material having flexibility (for example, rope)
J: Jack JA: Jig gripping portion M: Stirring motor (rotation drive source)

Claims (4)

removing the bearing below the stirring shaft;
The halves divided into two parts are configured to be connectable to each other, and in a state in which the halves are connected, a stirring shaft through-hole for accommodating the stirring shaft and a column through-hole for accommodating the column at the bottom of the tank are formed. Align the through-hole for the stirring shaft of the jig for removing the stirring shaft with the stirring shaft, align the through-hole for the support with the support at the bottom of the tank, and connect the halves of the jig for removing the stirring shaft. holding;
disposing a jack in a region immediately below the jig for removing the stirring shaft;
A step of raising a jack, and a step of supporting the lower end of the stirring shaft with the jack while the jig for removing the stirring shaft is arranged, or the lower end of the stirring shaft while the jig for removing the stirring shaft is arranged. supported by a jack through the jig for removing the stirring shaft;
Disconnecting the stirring shaft by rotating the stirring shaft relative to the output shaft of the rotary drive source while lowering the stirring shaft with a jack to release the screw engagement between the stirring shaft and the output shaft. Method. 2. The method for removing the stirring shaft according to claim 1 , wherein the stirring shaft upper portion is supported by the stirring shaft upper portion supporting member. While raising the jack supporting the stirring shaft in the method for removing the stirring shaft according to any one of claims 1 and 2 , rotating the stirring shaft relative to the output shaft of the stirring motor, the output of the stirring shaft and the stirring motor a step of screwing the shaft;
a step of removing the jack from below the jig for removing the stirring shaft after the stirring shaft and the stirring motor are screwed together;
The halves divided into two parts are configured to be connectable to each other, and in a state in which the halves are connected, a stirring shaft through-hole for accommodating the stirring shaft and a column through-hole for accommodating the column at the bottom of the tank are formed. A step of deploying a jig for removing the stirring shaft,
A method for installing a stirring shaft, comprising a step of removing the jig for removing the stirring shaft from the column and the stirring shaft at the bottom of the tank. 4. The method of attaching a stirring shaft according to claim 3 , further comprising the step of removing from the stirring shaft a stirring shaft upper support member that is attached to the top of the stirring shaft and supports the stirring shaft.

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