JP2020054965A - Tool for agitation shaft and agitation shaft removing method using the same - Google Patents

Abstract

To provide an agitation shaft removing tool such that a plurality of operators need not enter a tank and can easily and safely hold an agitation shaft which is a heavy article of about 100 kg, and perform an operation to rotate and separate it, and an agitation shaft removing method and attaching method using the tool.SOLUTION: An agitation shaft removing tool (1) according to the present invention is used to remove an agitation shaft (3) of a tank (2) used to manufacture, for example, milk products etc., and so constituted that two divided half body parts (1-1, 1-2) can be coupled, the agitation shaft removing tool (1) having a through hole (1A) for agitation shaft formed to house the agitation shaft (3) with the half body parts (1-1, 1-2) coupled and also having a through hole (1B) for support rod formed to house a support rod (4) at a tank bottom part (2A).SELECTED DRAWING: Figure 2

Description

  The present invention relates to the removal and installation of a stirring shaft in a tank used for producing, for example, dairy products and the like.

For example, in a tank used to manufacture dairy products, etc., in order to prevent contamination of other bacteria and other foreign matter from the outside, between a stirring shaft for stirring the contents of the tank and a stirring motor for driving the stirring shaft, The 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 the inspection. Also, when various troubles (for example, steam leakage) occur, it is necessary to remove the mechanical seal from the tank.
When removing the mechanical seal from the tank, it is necessary to separate the stirring shaft and the stirring motor output shaft, for example, connected by screwing.

Here, the weight of the stirring shaft is often about 100 kg, which is not a weight that can be gripped by a single operator. For this reason, conventionally, about four workers enter the tank from which the mechanical seal should be removed, and rotate while holding the stirring shaft with the manual power of the worker to rotate the stirring shaft from the output shaft of the stirring motor and the mechanical seal. Was separated.
However, the working environment is very poor due to a plurality of workers entering the narrow tank. The operation of rotating and separating while holding the stirring shaft, which is a heavy object of about 100 kg, is a very dangerous operation.
In addition, if the operator loses balance in the tank, the stirring shaft held may collide with the inner wall surface or the bottom surface of the tank and damage the tank.
An effective solution to such a problem has not yet been proposed.

  As another conventional technique, for example, a technique for removing a stirring blade of a large food stirring pot has been proposed (see Patent Literature 1), but this technique is not a technique relating to removal or attachment of a stirring shaft that is about 100 kg in weight.

JP-A-11-197481

  The present invention has been proposed in view of the above-described problems of the related art, and there is no need for a plurality of workers to enter a tank, and a worker can easily and safely use a stirring shaft having a weight of about 100 kg. A jig for removing the stirring shaft, which can perform the work of rotating, separating, and preventing the stirring shaft from colliding with the inner wall surface or the bottom surface of the tank during the work and damaging the tank; It is an object of the present invention to provide a method of removing and attaching a stirring shaft using such a jig.

The jig (1) for removing a stirring shaft according to the present invention is a jig (1) for removing a stirring shaft used for removing a stirring shaft (3) in a tank (2) (for example, used for producing dairy products or the like). )
The two divided half bodies (1-1, 1-2) are configured to be connectable to each other,
In a state where the half portions (1-1, 1-2) are connected to each other (see FIG. 2), a through-hole (1A) for the stirring shaft accommodating the stirring shaft (3), and a support at the tank bottom (2A). (4: A support through-hole (1B) for accommodating a support for the support) is formed.

In the jig (1) for removing a stirring shaft according to the present invention, the two halves (1-1, 1-2) are joined at one end, and the halves (1-1, 1-2) are joined together. Is preferably configured to be deployable and connectable.
In the jig (1) for removing the stirring shaft of the present invention, a ring for preventing damage to the stirring shaft is mounted on the stirring shaft (3) side (upper side) of the through hole (1A) in which the stirring shaft (3) is housed. Preferably, it is located.

The stirring shaft removal method of the present invention,
Removing the bearing (5) below the stirring shaft (3);
Penetration for the stirring shaft of the stirring shaft removal jig (1: one in which the two divided halves are joined at one end, and one on which the stirring shaft damage preventing ring is placed) The hole (1A) is aligned with the stirring shaft (3), the support through hole (1B) is aligned with the support (4) of the tank bottom (2A), and the half of the stirring shaft removal jig (1) is aligned. (1-1, 1-2) connecting and holding each other (for example, by bolts and nuts);
Disposing a jack (J) in a region directly below the jig (1) for removing the stirring shaft;
A step of raising the jack (J); a step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) with the jig (1) for removing the stirring shaft disposed therein; A step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) via the stirring shaft removing jig in a state where the shaft removing jig (1) is arranged;
While lowering the stirring shaft (3) by the jack (J), the stirring shaft (3) is rotated relative to the output shaft of the rotary drive source (M: stirring motor), and the stirring shaft (3) and the output shaft are rotated. And a step of releasing the screw engagement with

In the method of removing the stirring shaft of the present invention, the upper portion of the stirring shaft (3) is supported (for example, by a flexible strip material such as a rope, a metal or resin device, etc.) (for example, a flexible strip member). It is preferable to support the stirring shaft 3 at three points in the circumferential direction: three-point support).
In addition, in the stirring shaft removing method of the present invention, the width of the top plate-shaped member (JA: a member abutting on the stirring shaft removing jig 1: a jig gripping portion) is set to the stirring shaft removing jig (1). 2 is slightly larger than the dimension in the width direction (the direction of the arrow B in FIG. 2), and both ends of the jig gripping portion (JA) (both ends in the width direction of the stirring shaft removing jig 1) are bent. Preferably (J) is used.

The stirring shaft mounting method of the present invention,
While the jack (J) supporting the stirring shaft (3) is raised by the stirring shaft removing method (including the stirring shaft removing method supporting the upper portion of the stirring shaft), the stirring shaft (3) is moved to the stirring motor (M). A) rotating the stirring shaft (3) and the output shaft of the stirring motor (M) relative to the output shaft of
Removing the jack (J) from below the stirring shaft removing jig (1) after the stirring shaft (3) and the stirring motor (M) are screwed together;
The jig for detaching the stirring shaft in which the half portions (1-1, 1-2) are connected to each other (1: a jig in which the two divided half portions are connected at one end to prevent the stirring shaft from being damaged) Deploying (including those on which the ring is mounted) (by unscrewing the bolts and nuts);
The method further comprises a step of removing the stirring shaft removing jig (1) from the support (4) and the stirring shaft (3) of the tank bottom (2A).

  In the stirring shaft mounting method of the present invention, the stirring shaft upper support member (6: for example, a rope, metal or resin made of a flexible material, which supports the upper portion of the stirring shaft (3) in the stirring shaft removing method). It is preferable to have a step of removing (e.g., the above-mentioned device) (from above the stirring shaft).

According to the present invention having the above-described configuration, when the bearing (5) below the stirring shaft (3) is removed when removing the stirring shaft (3), the jig (1) for removing the stirring shaft is removed. In the arranged state, the lower end of the stirring shaft (3) is held (supported) by the jack (J). Here, since the stirring shaft removing jig (1) integrally holds the stirring shaft (3) and the support (4) for supporting the bearing (5), the bearing (5) for supporting the lower end of the stirring shaft. The stirring shaft (3) is stably held even in a state in which is removed.
In this state, while the stirring shaft (3) is lowered by the jack (J), the stirring shaft (3) is rotated relatively to the output shaft of the rotary drive source (M: stirring motor), and the stirring shaft (3) is rotated. When the screw between the shaft and the output shaft (output shaft of the stirring motor M) is released, 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) in a state where the jig (1) for removing the stirring shaft is arranged, it is not necessary for an operator to lift and support the stirring shaft (3). Absent.
Then, even a single worker 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 performed by a single operator.
Therefore, according to the present invention, the removal of the stirring shaft (3), which has been performed by a plurality of workers in the related art, can be performed by only a single worker.

While the mechanical seal (MS) is removed from the tank (2) and necessary inspections, repairs, and other maintenance work are performed, the stirring shaft (3) has the jig (1) for dismounting the stirring shaft. And is stably supported by the jack (J).
When the stirring shaft (3) is screwed again to the output shaft of the rotary drive source (M: stirring motor), the stirring shaft (3) is connected to the jack (J) while the jig (1) for removing the stirring shaft is arranged. ), The jack (J) is gradually raised, and the stirring shaft (3) is moved by the operator relative to the output shaft of the stirring motor (M: see FIG. 1). And screw the stirring shaft (3) with the output shaft of the stirring motor (M).
If the stirring shaft (3) and the stirring motor (M) are completely screwed together, there is no danger that the stirring shaft (3) will fall, so the jack (J) must be placed below the jig (1) for removing the stirring shaft. Remove from

  Then, the jig (1) for removing the stirring shaft is developed, the jig (1) for removing the stirring shaft is removed from the column (4) and the stirring shaft (3), and a bearing (5) is provided at the lower end of the stirring shaft (3). ) Is installed, and if 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. It is an explanatory perspective view showing the jig for agitating shaft removal concerning an embodiment. It is a top view which shows the 1st modification of the jig | tool for removing a stirring shaft which concerns on embodiment. It is a top view which shows the 2nd modification of the jig for stirring shaft removal which concerns on embodiment. It is a flowchart showing one process of a stirring shaft removal method concerning an embodiment. FIG. 6 is a process diagram showing a process following the process in FIG. 5. It is a top view which shows the damage prevention mat arrange | positioned just below the stirring shaft. FIG. 7 is a perspective view showing a state in which the scratch prevention mat is disposed immediately below the stirring shaft, and is an explanatory view different from FIG. 6. It is explanatory drawing which shows the state which matched the support | pillar and the stirring shaft with the through-hole of the deployed stirring-axis removal jig. It is a process figure showing a process of making a jig for removal of a stirring shaft closed. It is a process figure showing a process of arranging a jack immediately under a jig for removing a stirring shaft. It is a process figure showing a process of lowering a jack arranged immediately below a jig for removing a stirring shaft. FIG. 13 is an explanatory diagram showing a state in which a stirring shaft is supported by a jack and another stirring shaft is supported, which is different from FIG. 12. It is explanatory drawing which shows the aspect which supports the stirring shaft different from the stirring shaft shown in FIGS. It is explanatory drawing regarding the jig holding | grip part of the jack used by embodiment.

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, for example, a tank 2 used for producing dairy products or the like contains a stirring shaft 3 for stirring contents. A plurality (two blades in FIG. 1) of stirring blades 3A are attached to the stirring shaft 3 in the axial direction (vertical direction in FIG. 1).
The stirring shaft 3 is a heavy object (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 columns 4 (columns for supporting the bearing) fixed to the tank bottom surface 2A.

In the upper part of the tank 2, a stirring motor M for rotating and driving the stirring shaft 3 is arranged near the center in the radial direction. Although not explicitly shown in FIG. 1, the output shaft of the stirring motor M is provided with a male screw, and a blind hole having a female screw is formed at the upper end of the stirring shaft 3. The output shaft of the stirring motor M and the stirring shaft 3 are connected by screwing the male screw of the output shaft with the female screw at the upper end of the stirring shaft 3.
Note that, depending on the stirring tank, a blind hole having a female screw is formed on the output shaft of the stirring motor M, and a male screw may be cut at the upper end of the stirring shaft 3.

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 a conventionally known commercial product can be applied.
It is necessary to remove the mechanical seal MS from the tank 2 at the time of periodic inspection and repair of the mechanical seal MS. Here, although not shown clearly, 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 released from engagement with each other, The output shaft of the stirring motor M and the stirring shaft 3 must be separated.

FIG. 2 shows a stirring shaft removing jig 1 according to the illustrated embodiment.
In FIG. 2, the jig 1 for removing the stirring shaft can be divided into two parts, ie, half parts 1-1 and 1-2. Are connected by a hinge portion 1C arranged in the upper portion, so that the half portions 1-1 and 1-2 can be in a state of being unfolded (opened) and in a connected state. I have. Further, a clamp (not shown) is arranged on the opposite side to the surface on which the hinge 1C is arranged. FIG. 2 shows a state in which the half portions 1-1 and 1-2 are connected to each other.
The material constituting the jig 1 for removing the stirring shaft 1 (half body portions 1-1 and 1-2) may have a buffer function to the extent that the stirring shaft 3 (FIG. 1) is not damaged and a strength to hold the stirring shaft 3. It is a flexible material, and for example, a polyacetal resin (POM) (delulin: registered trademark) using formaldehyde as a raw material can be used.
Further, the size of the jig 1 for removing the stirring shaft may be appropriately set according to the size of the stirring tank or the stirring shaft 3. In particular, the length of the long side (L direction in FIG. 2) is preferably about 200 to 500 mm, the length of the short side (B direction in FIG. 2) is about 50 to 150 mm, and the height is about 60 to 150 mm.

In a state in which the half portions 1-1 and 1-2 are connected to each other (a state in FIG. 2), the stirring shaft 3 is attached to the jig 1 for removing the stirring shaft (half portions 1-1 and 1-2). A stirring shaft through-hole 1A to be accommodated therein and a column through-hole 1B (two places) to accommodate a column 4 (supporting column, FIG. 1) fixed to the tank bottom 2A are formed. The through hole 1A for the stirring shaft and the through hole 1B for the strut extend in the vertical direction (vertical direction in FIG. 2) when attached (see FIGS. 9 and 10).
The inner diameter of the stirring shaft through-hole 1 </ b> A is set such that the stirring shaft 3 is rotatable but does not skew. On the other hand, the inner diameter of the pillar through hole 1B is formed to have a small backlash and to be able to hold the pillar 4 properly. The through hole 1A for the stirring shaft and the through hole 1B for the support need not be independent, and if the stirring shaft 3 and the support 4 can be held as described above, there is no problem even if some of the through holes are connected. Absent.

Further, a through hole 1D for a bolt is formed in the jig 1 for removing the stirring shaft (half portions 1-1 and 1-2), and the half portions 1-1 and 1-2 are connected to each other. In the state of FIG. 2, the bolt through-hole 1 </ b> D extends in the width direction of the jig 1 for removing the stirring shaft (the direction of arrow B in FIG. 2).
In FIG. 2, the bolt through-holes 1 </ b> D are formed at two places near the hinge 1 </ b> C end of the stirring shaft removal jig 1 and near the end opposite to the hinge 1 </ b> C. The number of the through holes 1D is not limited to two. For example, the bolt through-hole 1D near the hinge 1C side end may be omitted.
In a state where the half portions 1-1 and 1-2 are connected to each other, a bolt (not shown) is inserted into the bolt through hole 1D of the jig 1 for removing the stirring shaft, and screwed with a nut (not shown) to stir. The half portions 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 support 4 can be properly held.
FIG. 2 shows an example in which the half-parts 1-1 and 1-2 are connected by hinges 1C arranged at one end, but the hinges 1C can be omitted. is there. In this case, the half portions 1-1 and 1-2 having no hinge portion 1C may be fixed only by the bolts and nuts inserted into the bolt through holes 1D.

Although not shown in FIG. 2, for example, a fluororesin (Teflon: registered trademark) is formed on the stirring shaft through-hole 1 </ b> A into which the stirring shaft 3 of the stirring shaft removal jig 1 is inserted (to the stirring shaft 3 side). (A ring for preventing agitation shaft damage) can be mounted to prevent the agitation shaft 3 from being damaged.
When the lowermost stirring blade in the vertical direction (vertical direction in FIG. 1) interferes with the jig 1 for removing the agitating shaft at the time of removal or attachment, if the jig 1 for removing the agitating shaft 1 The interference can be avoided by chamfering both ends (in the direction of arrow L in FIG. 2).

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

Further, in FIG. 2, the through hole 1A for the stirring shaft and the through hole 1B for the column are both through holes having a circular cross section. Here, the column 4 is fixed to the tank bottom surface 2A. Therefore, as long as the relative position between the stirring shaft 3 and the support 4 can be maintained, the cross section of the support through-hole 1B need not be circular as shown in the second modified example of FIG. 4 (1Bh). The jig 1 does not have to completely surround the support 4.

Next, a method of removing the stirring shaft 3 according to the embodiment will be described with reference to FIGS.
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 support member 6 such as a rope. When fixed by the stirring shaft upper support member 6, it is preferable to support the stirring shaft 3 at three points in the circumferential direction on the inner peripheral surface of the tank 2 (three-point support). Here, the upper part of the stirring shaft 3 may be fixed to the tank 2 by a metal or resin tool or the like instead of the rope 6 which is a flexible strip. In this specification, a flexible rope, a metal or resin device, or the like may be collectively referred to as a "stirring shaft upper support member" and indicated by reference numeral 6.
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 screw formed in the blind hole at the upper end of the stirring shaft 3 is screwed with the male screw formed on the output shaft of the stirring motor M. Connected to the output shaft. In addition, since the upper part of the stirring shaft 3 is fixed to the tank 2 by the supporting member 6 for the stirring shaft upper part by the process of FIG. 5, the stirring shaft 3 is safely and securely held without the worker. Have been.
Here, the step shown in FIG. 5 (the step of supporting the upper portion of the stirring shaft 3 by the stirring shaft upper support member 6) can be omitted.

In the step shown in FIG. 6, the scratch prevention mat 7 (see FIG. 7) is arranged on the tank bottom surface 2A immediately below the stirring shaft 3. The scratch prevention mat 7 is arranged to prevent the tank bottom surface 2A from being damaged when the jack J described later is installed.
The scratch prevention mat 7 is arranged in a region immediately below the stirring shaft 3 and in a region between the two columns 4. As shown in FIG. 7, a concave portion 7 </ b> A for preventing interference with the column 4 is formed on the damage prevention mat 7 so that the scratch prevention mat 7 does not interfere with the column 4.
The scratch prevention mat 7 is preferably made of, for example, rubber. This is because when the jack J described later is arranged, the effect of preventing the jack J from slipping can be exerted.

In FIG. 8, which is a perspective view showing a state (FIG. 6) in which the scratch prevention mat 7 is arranged directly below the stirring shaft, a scratch is formed in a region immediately below the stirring shaft 3 and between the two columns 4. Even if the prevention mat 7 is arranged, the interference between the strut 4 and the scratch prevention mat 7 can be avoided by the recess 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 removal jig 1, and the two columns 4 are fitted with the stirring shaft removal 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 column. In FIG. 9, the stirring shaft removing jig 1 is in a state in which the half portions 1-1 and 1-2 are developed (opened) around the hinge portion 1C (see FIG. 2).
Next, after the jig 1 for removing the stirring shaft is coupled with a clamp disposed on the opposite side of the hinge portion 1C (not shown), as shown in FIG. 2), and screwed in with a nut (not shown). Thereby, the half portions 1-1 and 1-2 of the stirring shaft removing jig 1 are connected to each other, and the developed stirring shaft removing jig 1 shown in FIG. And 1-2 are closed from the expanded state. Thus, the installation of the stirring shaft removing jig 1 is completed.

In the next step shown in FIG. 11, a jack J is inserted (inserted in the direction of arrow I in FIG. 11) and arranged in a region below the jig 1 for removing the stirring shaft.
Then, the jack J is raised (arrow U in FIG. 11) to approach (contact) the lower end of the jig 1 for removing the stirring shaft, and the jack J is further raised. The portion JA is in contact with 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) (the jack J is raised, and the jig 1 for removing the stirring shaft 1). (A step of supporting the lower end of the stirring shaft 3 with the jack J in a state where is disposed).
Alternatively, the jack J is raised (arrow U in FIG. 11), and is brought into contact with the lower end of the stirring shaft removing jig 1, and the jack J is further raised, via the stirring shaft removing jig 1. The lower end of the stirring shaft 3 is supported by the jack (the lower end of the stirring shaft 3 is held by the jack J via the stirring shaft removing jig in a state where the stirring shaft removing jig 1 is arranged). Supporting step).
A state in which the lower end of the stirring shaft 3 is supported by the jack via the jig 1 for removing the stirring shaft even when a jig gripping portion JA of the jack J described below is in contact with the lower end of the stirring shaft 3. Even so, the lower end of the stirring shaft (3) is supported by the jack (J) in a state where the jig (1) for removing the stirring shaft is arranged.

In the step shown in FIG. 11, if the lower end of the stirring shaft 3 is supported by the jack J, as shown in FIG. 12, the jack J is lowered (arrow D in FIG. 12) and the stirring shaft 3 is moved by the stirring motor M. The rotation of the stirring shaft 3 and the output shaft of the stirring motor M is gradually released by rotating the stirring shaft 3 and the output shaft of the stirring motor M little by little. Remove from
When the stirring shaft 3 is removed from the output shaft of the stirring motor M, the stirring shaft 3 and the support 4 (support for supporting the bearing) are integrally held by the stirring shaft removal jig 1. Therefore, even if the bearing 5 for supporting the lower end of the stirring shaft is removed, the jig 1 for removing the stirring shaft is supported by the tank bottom surface 2A via the support 4 and the stirring shaft 3 is maintained in a state of extending in the vertical direction. , And 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 by the jack J can be easily performed even by a single operator.
Further, as described with reference to FIG. 5, since the upper portion of the stirring shaft 3 is supported (or fixed) by the stirring shaft upper support member 6 (for example, a rope), the state where the stirring shaft 3 extends in the vertical direction is maintained. You.

In FIG. 12, the stirring shaft 3 is held by the lower end 3E of the stirring shaft 3 being in contact with the jack J, and the "stirring shaft (3) with the stirring shaft removal jig (1) arranged" Step of Supporting Lower End (3E) with 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 step, the step 3S abuts on 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 by the reaction force (reaction force against the gravity of the stirring shaft 3) in which the upper surface 1U of the jig 1 acts on the step 3S. In some cases, the shaft 3 is held. The holding mode shown in FIG. 13 is that the jack (J) is connected to the lower end (3E) of the stirring shaft (3) via the stirring shaft removing jig while the stirring shaft removing jig (1) is arranged. Step supported by ".

5 to 12, the stirring shaft 3 is illustrated as a shaft having the same diameter. However, as shown in FIG. 13, the diameter of the stirring shaft 3 may fluctuate near the jig 1 in some cases. FIG. 14 shows in detail how the stirring shaft 3 is held when the diameter of the stirring shaft 3 fluctuates near the jig 1.
In FIG. 14A, the diameter of the stirring shaft 3 is reduced near the jig 1 to form a step 3S. In FIG. 14 (A), similarly to FIG. 13, the lower end 3E of the stirring shaft 3 does not come into contact with the jack J, and the friction between the stirring shaft 3 and the inner peripheral surface of the stirring shaft through hole 1A of the jig 1. Thus, the stirring shaft 3 is held. FIG. 14A also shows that “the lower end (3E) of the stirring shaft (3) is supported by the jack (J) via the stirring shaft removal jig in a state where the stirring shaft removal jig (1) is arranged. Step ". In FIG. 14A, the step 3S is not in contact with the upper surface 1U of the jig 1.
On the other hand, in FIG. 14B, the stirring shaft 3 is held by the lower end 3E of the stirring shaft 3 being in contact with the jack J as in FIG. FIG. 14B corresponds to “the step of supporting the lower end portion (3E) of the stirring shaft (3) with the jack (J) while the jig (1) for removing the stirring shaft is arranged”. Also in FIG. 14B, the step 3S does not contact the upper surface 1U of the jig 1.

In FIG. 14C, the lower end 3E of the stirring shaft 3 is not in contact with the jack J as in FIG. 13, but the step 3S is in contact with the upper surface 1U of the jig 1. The stirring shaft 3 is held by the reaction force (reaction force against the gravity of the stirring shaft 3) that the upper surface 1U of the jig 1 acts on the step 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 in a state where the stirring shaft removing jig (1) is disposed). ".
In FIG. 14 (D), the lower end 3E of the stirring shaft 3 is in contact with the jack J, and the step 3S is in contact with the upper surface 1U of the jig 1. The lower end 3E of the stirring shaft 3 is supported by the jack J, and the reaction force against the gravity of the stirring shaft 3 acts on the step 3S from the upper surface 1U of the jig 1 so as to be held. In the case of FIG. 14 (D), "the lower end (3E) of the stirring shaft (3) is connected to the jack (J) via the stirring shaft removal jig in a state where the stirring shaft removal jig (1) is arranged. And the step of supporting the lower end (3E) of the stirring shaft (3) with the jack (J) while the jig (1) for removing the stirring shaft is disposed.
14 (A) to 14 (D), the jack J shows only the jig holding portion JA (see FIG. 15).

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

After the stirring shaft 3 is separated from the output shaft of the stirring motor M in this way, the mechanical seal MS (FIG. 1) can be removed from the tank 2 to perform inspection, repair, replacement, and other necessary maintenance work. . In the meantime, as described above with reference to FIG. 12, the stirring shaft 3 is stably mounted on the jack J while extending in the vertical direction with the jig 1 for removing the stirring shaft arranged. In other words, the stirring shaft 3 is supported by the jack J through the jig 1 for removing the stirring shaft so as to be stably extended in the vertical direction.
After that, when 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 the maintenance work after removing the mechanical seal MS, the stirring shaft 3 is screwed (connected) to the output shaft of the stirring motor M again, and the stirring shaft 3 is renewed when the mechanical seal MS is installed. It can also be separated from the M output shaft.

Next, a method of screwing (connecting) the stirring shaft 3 again to the output shaft of the stirring motor M, that is, a method of attaching the stirring shaft according to the embodiment will be described.
When screwing the stirring shaft 3 again to the output shaft of the stirring motor M, the stirring shaft 3 is connected via the stirring shaft removal jig 1 in the state shown in FIG. 12 (the state where the removal of the stirring shaft 3 is completed). The jack J, which is supported in the state of extending in the vertical direction, is gradually raised (arrow U in FIG. 12). Then, in a direction in which the stirring shaft 3 is screwed with the output shaft of the stirring motor M (see FIG. 1), the stirring shaft 3 is rotated relatively to the output shaft of the stirring motor M, and the stirring shaft 3 is stirred with the stirring shaft 3 little by little. The output shaft of the motor M is screwed.
When 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 jig 1 for removing the stirring shaft (arrow O in FIG. 11).

Then, in the stirring shaft removing jig 1 in a state (closed state) where the half portions 1-1 and 1-2 are connected to each other as shown in FIG. 10, the bolt through hole 1D of the stirring shaft removing jig 1 is provided. 9 is unscrewed from the bolt BT inserted into the nut, the bolt BT is pulled out, and the jig 1 for removing the stirring shaft is developed (opened) to obtain the state shown in FIG. That is, the fitting (alignment) between the two columns 4 and the column 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 removed. Release the fitting (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 scratch prevention mat 7 placed on the tank bottom surface 2A immediately below the stirring shaft 3 is removed. Then, the bearing 5 is installed on the support column 4 for supporting the bearing, so that the bearing 5 supports the lower end of the stirring shaft 3 (the state of FIG. 5).
Furthermore, the stirring shaft upper support member 6 (e.g., a string-shaped strip-like metal or resin device such as a rope) attached to the upper portion of the stirring shaft 3 is removed. When 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.
Thereby, the stirring shaft 3 and the output shaft of the stirring motor M are connected, and the mounting operation of the stirring shaft 3 is completed (the state of FIG. 1).

According to the embodiment of the present invention, when removing the stirring shaft 3, the lower end of the stirring shaft 3 is held (supported) by the jack J in a state where the stirring shaft removal jig 1 is arranged. Here, since the stirring shaft removing jig 1 integrally holds the stirring shaft 3 and the support column 4 for supporting the bearing, even if the bearing 5 for supporting the lower end of the stirring shaft is removed, the stirring shaft 3 is removed. Is stably held by the jack J while extending in the vertical direction. If the upper portion of the stirring shaft 3 is fixed to the tank 2 by the supporting member 6 for the stirring shaft upper portion (for example, a rope, other equipment, or the like), the stirring shaft 3 is held in a more stable and vertically extended state. .
Furthermore, since the width direction end of the stirring shaft removing jig 1 of the jig holding portion JA of the jack J is bent, the stirring shaft removing jig 1 is securely supported (held) by the jig holding portion JA. You can do it.

When the stirring shaft 3 and the support column 4 for supporting the bearing are integrally held by the stirring shaft removal jig 1, the bolt BT is inserted into the bolt through hole 1D of the stirring shaft removal jig 1, and screwed with a nut. Thus, the half portions 1-1 and 1-2 of the jig 1 for removing the stirring shaft can be securely connected to each other.
In this state, while the stirring shaft 3 is lowered by the jack J, the stirring shaft 3 is rotated relative to the output shaft of the stirring motor M, and the screwing between the stirring shaft 3 and the output shaft of the stirring motor M is released. 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 disposed on the tank bottom surface 2A directly below the stirring shaft 3, it is possible to prevent the tank bottom surface 2A from being damaged when the jack J is installed.

Here, the stirring shaft 3 is supported by the jack J in a state where the stirring shaft 3 is stably extended in the vertical direction in a state where the stirring shaft removing jig 1 is arranged. There is no need to lift and support.
And even if it is a single worker, it is possible to rotate the stirring shaft 3 relatively to the output shaft of the stirring motor M while lowering the jack J.
Therefore, according to the illustrated embodiment, the removal of the stirring shaft 3 which has been performed by a plurality of workers in the related art can be performed by only a single worker.

While removing the mechanical seal MS from the tank 2 and performing necessary inspection, repair, replacement, and other maintenance work, the stirring shaft 3 is stably supported by the jack J via the stirring shaft removing jig 1. ing.
When screwing the stirring shaft 3 again to the output shaft of the stirring motor M, the stirring shaft 3 is supported by the jack J while the stirring shaft 3 is stably extended in the vertical direction with the jig 1 for dismounting the stirring shaft arranged. Therefore, the jack J is gradually raised, and the stirring shaft 3 is rotated relatively to the output shaft of the stirring motor M, so that the stirring shaft 3 and the output shaft of the stirring motor M are screwed together. The operation of raising the jack J little by little and rotating the stirring shaft 3 relative to the output shaft of the stirring motor M can also be executed by a single operator.
If the stirring shaft 3 and the stirring motor M are completely screwed, there is no possibility that the stirring shaft 3 will fall, and the jack J is removed from below the jig 1 for removing the stirring shaft.

Then, the jig 1 for removing the stirring shaft is developed (opened), and the jig 1 for removing the stirring shaft is removed from the column 4 for supporting the bearing and the stirring shaft 3, and is placed on the tank bottom surface 2A immediately below the stirring shaft 3. Remove the placed scratch prevention mat 7.
Further, a bearing 5 is installed at the lower end of the stirring shaft 3, and the bearing 5 is supported by the support 4. When the stirring shaft 3 is detached and the stirring shaft upper support member 6 is attached to the upper portion of the stirring shaft 3, by removing the stirring shaft upper supporting member 6, the attaching operation of the stirring shaft 3 is completed.

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, instead of the mechanical jack J, a cushion member that can be expanded and compressed by supplying and discharging a working fluid (for example, air and oil) to change the thickness dimension can be used. In this case, a working fluid source, a working fluid circuit that communicates the cushion member with 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 of the cushion member, and using the cushion member to remove the stirring shaft. The stirring shaft 3 can be lowered or raised while supporting the lower end of the stirring shaft 3 with the device 1 attached.

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

DESCRIPTION OF SYMBOLS 1 ... Jig for stirring shaft removal 1-1, 1-2 ... Half body part 1A ... Through hole 1B for stirring shaft ... Through hole 2 for support | pillar 2 ... Tank 2A ... Tank Bottom 3 Stirring shaft 4 Support (support for bearing support)
5 ... Bearing 6 ... Flexible strip (for example, rope)
J: Jack JA: Jig gripper M: Stirring motor (rotary drive source)

Claims (7)

In the jig for removing the stirring shaft used for removing the stirring shaft of the tank,
It is configured such that the two divided halves can be joined together,
A jig for removing a stirring shaft, wherein a through hole for a stirring shaft for housing a stirring shaft and a through hole for a support for housing a support at a tank bottom portion are formed in a state where the half portions are connected to each other. .   2. The jig for removing a stirring shaft according to claim 1, wherein the two divided halves are joined at one end so that the halves can be developed and joined.   The jig for removing a stirring shaft according to any one of claims 1 and 2, wherein a ring for preventing damage to the stirring shaft is mounted on the stirring shaft side of the through hole in which the stirring shaft is housed. Removing the bearing below the stirring shaft;
4. The stirring shaft removal hole of the stirring shaft removal jig according to any one of claims 1 to 3, wherein the stirring shaft removal hole is aligned with the stirring shaft; Joining and holding the body parts together,
A step of arranging a jack in an area immediately below the stirring shaft removal jig,
A step of raising the jack, a step of supporting the lower end of the stirring shaft with the jack in a state in which the stirring shaft removing jig is arranged, or a lower end of the stirring shaft in a state in which the stirring shaft removing jig is arranged. Supporting a jack via the stirring shaft removal jig,
Removing the stirring shaft by rotating the stirring shaft relative to the output shaft of the rotary drive source while lowering the stirring shaft by the jack to release the screwing of the stirring shaft and the output shaft. Method.   5. The method for removing the stirring shaft according to claim 4, wherein the upper portion of the stirring shaft is supported by the upper support member of the stirring shaft. The stirring shaft is rotated relative to the output shaft of the stirring motor while the jack supporting the stirring shaft is raised by the stirring shaft removal method according to any one of claims 4 and 5, and the output of the stirring shaft and the stirring motor is output. Screwing the shaft;
After the stirring shaft and the stirring motor are screwed together, removing the jack from below the stirring shaft removal jig,
Deploying the jig for removing the stirring shaft according to any one of claims 1 to 3, wherein the halves are connected to each other;
A method of attaching a stirring shaft, comprising a step of removing the jig for removing the stirring shaft from a column and a stirring shaft at a tank bottom.   The stirring shaft mounting method according to claim 6, further comprising a step of removing a stirring shaft upper support member that supports an upper portion of the stirring shaft in the stirring shaft mounting method according to claim 5.

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