JP2003089398A - Propeller pulling-out tool for underwater machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently pull a propeller 6 out of a shaft 4 in the axial direction without causing damage to a propeller boss part 7 in an underwater machine having the propeller 6 mounted in a boss part 7 in a tip part 4a of the shaft 4, forming a recessed part 9 on a tip face of the boss part 7 by making a tip face 4c of the shaft face its bottom face, and provided with an engaging part 10 on an inner peripheral face of the recessed part 9. SOLUTION: In the propeller pulling-out tool 20, a support member 22 is screw-fitted in and supported on a male screw member 21, and a pair of arms 23, 23 are supported on the support member 22 so as to swing. A locking part 25 engaging with an engaging part 10 of the propeller boss part 10 is provided in a front end part of each arm 23. Furthermore, a pipe member 26 is supported on the male screw member 21, and the arm 23 is held in an open condition by the pipe member 26 when the locking part 25 at the front end of the arm 23 is engaged with the engaging part 10 of the propeller boss part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for extracting a propeller from an underwater machine such as a submersible mixer or a submersible pump having a propeller, and particularly to a technical field for improving workability of the propeller extracting work.

[0002]

2. Description of the Related Art Conventionally, in this type of underwater machine,
When a propeller mounted integrally with the rotary shaft at the tip end of the rotary shaft by key connection or the like is slid in the axial direction and pulled out, for example, in a slight gap between the boss portion of the propeller and the casing, a commercially available gear is used. Generally, a method of inserting a puller or the like to pull out the propeller, or a method of inserting a thin plate or the like into the gap and hitting it with a mallet or the like to remove the propeller are commonly used.

[0003]

However, in the above-mentioned conventional method, since the gap between the propeller boss and the casing is small, it is difficult to insert a tool or the like into the gap, and
There is a possibility that the propeller boss or the casing may be damaged while the extracting work is repeated a plurality of times. And
If the gap between the propeller boss portion and the casing is covered and sealed with a rubber seal, the propeller boss portion or casing as described above may be damaged, causing a problem such as impairing the sealing function. . Also,
There is also a problem that the number of man-hours for extracting work increases and the work efficiency is low.

The present invention has been made in view of the above points, and an object thereof is to devise a propeller extracting tool of an underwater machine without causing damage to the boss portion of the propeller. It is to be able to extract the propeller efficiently.

[0005]

In order to achieve the above object, in the invention of claim 1, a propeller is attached to a tip end portion of a rotary shaft by a boss portion, and an inner circumference is formed on a tip end surface of the boss portion. For a submersible machine in which a concave portion having an engaging portion on the surface is formed with its bottom face facing the tip end surface of the rotating shaft, the front end portion is the underwater member as a tool for axially extracting the propeller from the rotating shaft. A male screw member axially abutting on the tip end surface of the rotating shaft of the machine, a support member screwed to the male screw member, and a rear end side swingably supported by the support member so as to open and close. A plurality of arms provided at the front end, each of which has a locking portion that engages with the engaging portion of the inner peripheral surface of the recess of the boss portion of the propeller, and the locking portion at the front end of the arm is the boss portion by the opening operation of the arms. When engaged with the engaging portion on the inner peripheral surface of the recess,
Locking support means for holding the arm in the open state, and the supporting member is moved backward by rotating the male screw member in the engaged state of the locking portion at the front end of the arm and the engaging portion on the inner peripheral surface of the recess of the boss portion. The boss is pulled out from the rotation shaft by screwing in the direction.

According to the above construction, the arm is opened and the locking portion at the front end of the arm is engaged with the engaging portion on the inner peripheral surface of the recess of the boss, and the opened state of the arm is held by the locking and holding means. Hold. When the male screw member is rotated in this holding state,
The support member is screwed backward along the male screw portion, and the arm supported by the support member moves rearward with the boss portion engaged, whereby the boss portion is slid to rotate the rotary shaft. Can be extracted from. Therefore, since the propeller is pulled out from the rotating shaft by moving the arm backward while the engaging portion of the front end of the arm and the engaging portion of the boss portion are engaged, damage to the boss portion or the like of the propeller does not occur.
The propeller can be removed efficiently.

According to the second aspect of the invention, at least the outer surface of the front end portion of the arm has a shape corresponding to the inner peripheral surface of the recess of the boss portion of the propeller. This increases the contact area between the outer surface of the front end of the arm and the inner peripheral surface of the recess of the boss of the propeller,
Since both can be locked more firmly, the engagement state between the locking part at the front end of the arm and the engaging part on the inner peripheral surface of the recess of the boss can be stably maintained.

According to the third aspect of the invention, the locking and holding means is a pipe member supported by the male screw member so as to be movable in the axial direction.

According to the above construction, when the rear end sides of the plurality of arms are gripped so that the inner surface of the arm intermediate portion is pressed against the pipe member, these arms are supported by the contact position with the pipe member as a fulcrum. In principle, the arm front ends open apart from each other, and the locking portion provided at the arm front end engages with the engaging portion of the recess. As a result, the arm can be easily held in the open state stably with a simple structure.

According to the fourth aspect of the present invention, a hole is formed in the tip end surface of the rotating shaft of the underwater machine, and the front end portion of the male screw member is provided with a tapered taper portion that engages with the hole. With this configuration, the work of aligning the front end portion of the male screw member with the tip end surface of the rotating shaft and bringing them into contact with each other becomes easy.

According to the fifth aspect of the invention, the retaining portion for the pipe member is provided at the front end portion of the male screw member. In this way, the pipe member is prevented from coming off from the propeller extracting tool, which is convenient for carrying and storing the tool.

According to the sixth aspect of the invention, a handle portion for rotating the male screw member is integrally provided at the rear end of the male screw member.

According to the above construction, when the propeller is pulled out, the male screw member can be easily rotated only by operating the handle portion provided integrally with the male screw member. As a result, it becomes unnecessary to separately operate the male screw member by using a tool such as a wrench or a spanner, and the workability of the extraction work can be improved.

In the invention of claim 7, the underwater machine is an underwater mixer. With this configuration, the submersible mixer can be easily inspected with good workability without causing damage to the boss portion of the propeller.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In FIG. 4, reference numeral 1 denotes an underwater mixer as an underwater machine, and although not shown, this underwater mixer 1 is, for example, a reservoir, pond lake water, trench, fish farm at a sewage treatment plant or various factories. It is immersed in the stored water in the water tank consisting of a place etc. while being supported so that it can be moved up and down by a guide bar,
It is used to agitate the stored water by its operation and promote purification. This submersible mixer 1 includes a closed cylindrical casing 2 having a motor (not shown) inside, and a front end portion 4a of a shaft 4 as a rotation shaft of the motor projects from a front wall portion of the casing 2, A propeller 6 is attached to the distal end portion 4a of the rotor 4 by key connection so as to rotate together. The propeller 6 has an outer peripheral portion formed of a spherical surface having a small diameter toward the tip and has a shaft 4 at the center thereof.
It is composed of a substantially hemispherical boss portion 7 having a shaft insertion hole 5 through which is inserted, and a plurality of stirring blades 8, 8 ... which are integrally joined to the outer peripheral surface of the boss portion 7 at intervals in the circumferential direction.

Further, as shown in FIG. 1, a cylindrical recess 9 having a bottom is formed in the tip surface of the boss portion 7 concentrically with the shaft insertion hole 5, and the shaft is inserted into the bottom surface of the recess 9. The hole 5 is opened, and the boss portion 7 is attached to the shaft 4 with the tip 4a of the shaft 4 protruding from the bottom of the recess 9, that is, with the tip 4c of the shaft 4 facing the bottom of the recess 9. It is installed. Further, a screw portion 4d is provided on the tip portion 4a of the shaft 4 projecting from the bottom surface of the recess 9, and a nut 11 is inserted from the front of the recess 9 and screwed and fastened to the tip screw portion 4d of the shaft 4. As a result, the boss portion 7 of the propeller 6 is fixed to the shaft 4 so that the boss portion 7 does not come out integrally with the shaft 4 from coming off. Then, as shown in FIG. 5, a small-diameter hole 4e is provided at the center of the tip surface 4c of the shaft 4.

Further, as shown in FIG. 4, an engaging portion 10 composed of a concave groove is provided on the inner peripheral surface of the concave portion 9 near the opening, and the engaging portion 10 has a substantially disc shape. The lid 12 closes the open end of the recess 9.

The outer peripheral portion of the front wall portion of the casing 2 is slidably in contact with the outer peripheral portion of the boss portion 7 of the propeller 6 so that the outer peripheral portion of the front wall portion of the casing 2 and the outer peripheral portion of the boss portion 7 of the propeller 6 are formed. An external seal 13 is attached and fixed so as to cover the gap therebetween over the entire circumference.

A ring-shaped draft ring 14 is fixedly supported by the casing 2 around the propeller 6 for the purpose of maintaining the stirring energy for the stored water over a long distance. Further, a slide portion 15 having a U-shaped cross section is fixed to the rear end portion of the casing 2, and by mounting the slide portion 15 on the guide bar while sandwiching it, the underwater mixer 1 moves up and down on the guide bar. Supported as possible. Further, at the upper part of the rear end of the casing 2, a power cable 1 for supplying power to the motor is provided.
6 penetrates in a watertight manner, and the submersible mixer 1 rotates the propeller 6 to generate a swirling flow in the stored water by supplying electric power to the motor via the power cable 16, and the swirling flow The stored water in the water tank is agitated to promote purification.

For the purpose of inspecting or repairing the submersible mixer 1 used in this way, in order to slide the propeller 6 axially and pull it out of the shaft 4, an embodiment of the present invention as shown in FIGS. Propeller extraction tool 2
0 is used.

More specifically, the extraction tool 20 will be described in detail. The tool 20 is provided with a male screw member 21 screwed over substantially the entire length, and the male screw member 21 is provided at the rear end of the male screw member 21. An operating portion 21a formed of a hexagonal head for turning operation with a tool is integrally provided.

A support member 22 is screwed onto the male screw member 21, and the support member 22 is attached to the male screw member 21.
An annular portion 22a having an inner surface provided with a female screw (not shown) to be screwed into the inner peripheral surface of the annular portion 22a, and two rod portions 22b protruding from the outer peripheral surface of the annular portion 22a. ，
22b.

Then, the rod portion 22b of the supporting member 22,
A pair of arms (three or more) having a substantially arcuate cross section are supported by 22b so as to be swingable with a rod portion 22b inserted through a hole (not shown) on the rear end side of each arm 23. As a result, the arms 23, 23 are opened and closed so that the front ends thereof come into contact with and separate from each other. The respective arms 23 are prevented from coming off by substantially ring-shaped coming-off preventions 24, 24 provided at the tip of the rod portion 22b.

Further, at the front ends of the arms 23, 23,
Engaging portion 10 on the inner peripheral surface of recess 9 of boss portion 7 of propeller 6
A locking portion 25 having a substantially arcuate cross section that engages with is provided so as to project outward. The outer surface of the front end portion of each arm 23 and the front end surface of the locking portion 25 have a shape corresponding to the inner peripheral surface of the recess 9 of the boss portion 7 of the propeller 6.

Further, a cylindrical pipe member 26 as a locking and holding means having a through hole 26a having a diameter larger than the outer diameter of the male screw member 21 is supported on the male screw member 21 so as to be movable in the axial direction. There is. That is, the arm 23,
By the opening operation of the arm 23, the locking portions 2 of the arms 23, 23 front end
When 5 and 25 are engaged with the engaging portion 10 on the inner peripheral surface of the recess 9 of the boss portion 7, the intermediate portion of each arm 23 is connected to the pipe member 2
By contacting and holding the outer peripheral surface of 6, both arms 23,
23 is configured to be held in an open state.

Further, at the front end of the male screw member 21,
The retaining portion 27 having a tapered taper portion 27a that tapers toward the tip is integrally attached and fixed. The maximum outer diameter of the retaining portion 27 is set larger than the diameter of the through hole 26a of the pipe member 26, and the retaining portion 27 prevents the pipe member 26 from coming out of the male screw member 21. .

With the above-described structure, the propeller extraction tool 20 has the retaining portion 27 at the front end of the male screw member 21.
Of the tapered taper portion 27a in the axial direction is brought into contact with the tip end surface 4c of the shaft 4 from the axial direction, and the engaging portions 25 of the front ends of the arms 23, 23 and the engaging portion 1 of the inner peripheral surface of the recess 9 of the boss portion 7
0 is engaged and the state is held by the pipe member 26, and the male screw member 21 is rotated, whereby the support member 22 is screwed backward and the boss portion 7 is slid in the axial direction, and the shaft is rotated. It is configured to be pulled out from No. 4.

Next, a procedure for extracting the propeller 6 of the underwater mixer 1 from the shaft 4 using the propeller extracting tool 20 according to this embodiment will be described. As shown in FIG. 1, first, the operating portion 21a at the rear end of the male screw member 21 of the propeller extracting tool 20 is rotated to operate the arm 2
The engaging portions 25 on the inner peripheral surface of the recess 9 in the boss portion 7 of the propeller 6 of the underwater mixer 1
The support member 22 is screwed forward in such a position as to engage with and. In this state, the front end portion of the tool 20 is inserted into the concave portion 9 of the boss portion 7, and the male screw member 21 front end portion retaining portion 2
7, the tip of the tapered portion 27a of
It is brought into contact with the front end surface 4c of the in the axial direction.

At this time, since the retaining portion 27 provided at the front end portion of the male screw member 21 has a taper portion 27a which is tapered, the tip of this taper portion 27a is the tip surface 4 of the shaft 4.
It is engaged with the hole 4e provided in c. As a result, the front end portion of the male screw member 21 can be easily aligned with the center of the tip surface 4c of the shaft 4, and the abutting work between them can be facilitated.

Then, the pipe member 2 on the male screw member 21
6 is positioned at an appropriate position, and the rear ends of both arms 23, 23 located on the rear side of the pipe member 26 are grasped so that the inner surface of the intermediate portion of each arm 23 is pressed against the pipe member 26. 23, 23 are opened so as to isolate the front ends of the arms 23, 23 by the lever principle with the contact position with the pipe member 26 as a fulcrum, and the engaging portions 25, 25 at the front ends of the arms 23, 23 engage with the recesses 9. It engages with the joint portion 10, and in this state, the arms 23, 23 are stably held in the open state.

Thereafter, the operating portion 21a of the male screw member 21 is engaged with another tool (not shown) such as a wrench or a hexagonal wrench to rotate and the support member 22 is screwed backward. As a result, both arms 23, 23 supported by the support member 22 move rearward together with the support member 22 with the front end engaging portions 25, 25 engaged with the engaging portion 10 of the propeller boss 7. The boss portion 7 slides in the axial direction and is pulled out from the shaft 4.

Therefore, in this embodiment, the propeller 6 can be efficiently pulled out without causing damage to the boss portion 7 of the propeller 6, the outer seal 13 of the underwater mixer 1, and the like, and the workability can be improved easily. The underwater mixer 1 can be inspected.

Further, the outer surfaces of the front end portions of the arms 23, 23 have a substantially arcuate cross section and have a shape corresponding to the inner peripheral surface of the recess 9 of the boss portion 7 of the propeller 6, so that the arms 23, 2
The contact area between the outer surface of the front end portion of 3 and the inner peripheral surface of the recess 9 increases,
Both can be engaged more firmly. Therefore, the engagement state between the engagement portions 25, 25 at the front ends of the arms 23, 23 and the engagement portion 10 on the inner peripheral surface of the recess 9 of the boss portion 7 can be stably maintained, and the arm 23 can be removed when the propeller boss portion 7 is pulled out. , 23 does not come off from the propeller boss section 7.

Further, the male screw member 21 to the pipe member 26
Even if the tool 20 comes out, it is blocked by the retaining portion 27, so that the pipe member 26 can be always attached to the tool 20, which is convenient for carrying and storing the tool 20.

In the above embodiment, the hexagonal operation portion 21a is provided at the rear end portion of the male screw member 21, but instead of this, a handle portion for rotating and operating the male screw member 21 is integrally formed. It may be provided. Then propeller 6
When removing the work, the male screw member 21 can be easily rotated by operating the handle portion, and it is not necessary to separately operate the male screw member 21 by using another tool such as a wrench or a spanner. The workability of the propeller extraction work can be improved.

Further, in the above embodiment, the arms 23, 2
Pipe member 2 as a means for maintaining the open state of 3
Although 6 is provided, a spring or other one can be used.

Further, in the above embodiment, the underwater machine is an underwater mixer, but it may be an underwater pump or an underwater aerator, for example, and has a propeller mounted at the boss portion at the tip of the rotary shaft. The present invention can be applied to any submersible machine in which a concave portion is formed on the tip surface of the boss portion so that the bottom surface thereof faces the tip surface of the rotary shaft, and the engaging portion is provided on the inner peripheral surface of the concave portion. Similar effects can be obtained.

[0038]

As described above, according to the invention of claim 1, as a propeller extracting tool for an underwater machine, the engaging portion at the front end of the arm is the inner peripheral surface of the recess of the boss portion of the propeller as the arm is opened. With the male screw member rotated, the support member is screwed in the rearward direction while the male screw member is rotated, and the boss portion is slid out to be pulled out from the rotation shaft. By providing the locking and holding means for holding the arm in the open state when engaging with the engaging portion of the inner peripheral surface of the recess, the propeller can be removed efficiently without causing damage to the boss portion of the propeller. You can

According to the second aspect of the present invention, at least the outer surface of the front end portion of the arm has a shape corresponding to the inner peripheral surface of the recess of the boss portion of the propeller, so that the engaging portion of the front end of the arm and the inner peripheral surface of the recess portion of the boss portion. The engagement state with the engagement portion of can be stably maintained.

According to the third aspect of the present invention, the locking and holding means is a pipe member supported by the male screw member so as to be movable in the axial direction, so that the arm can be easily held stably in the open state with a simple structure. can do.

According to the fourth aspect of the present invention, by providing the taper taper portion at the front end portion of the male screw member, it becomes easy to align the front end portion of the male screw member with the tip end surface of the rotary shaft and bring them into contact with each other. .

According to the fifth aspect of the present invention, by providing the front end portion of the male screw member with the retaining portion for the pipe member, it is possible to enhance the convenience in carrying and storing the tool.

According to the invention of claim 6, since the handle for rotating operation is provided at the rear end of the male screw member,
The workability of extracting the propeller can be improved.

According to the invention of claim 7, since the underwater machine is the underwater mixer, the inspection of the underwater mixer can be easily performed with good workability.

[Brief description of drawings]

FIG. 1 is a diagram showing a working state of extracting a propeller of an underwater mixer using a propeller extracting tool according to an embodiment of the present invention.

FIG. 2 is a front view of a propeller extraction tool.

FIG. 3 is a side view of the propeller extracting tool as viewed from the front side.

FIG. 4 is a front view showing an underwater mixer with a part thereof cut away.

FIG. 5 is a side view of the underwater mixer with a propeller lid removed.

[Explanation of symbols]

4 shafts 4a tip 4c Tip surface 6 propellers 7 Boss 9 recess 10 Engagement part 20 Propeller extraction tool 21 Male screw member 22 Support member 23 arms 25 Locking part 26 Pipe members 27 retaining part 27a taper part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiyuki Horie             14 Sakudai, Ono City, Hyogo Prefecture Shinmeiwa Industry Co., Ltd.             Industrial Machinery Systems Division (72) Inventor Takehisa Watanabe             14 Sakudai, Ono City, Hyogo Prefecture Shinmeiwa Industry Co., Ltd.             Industrial Machinery Systems Division

Claims (7)

[Claims] 1. A propeller is attached to a tip portion of a rotary shaft by a boss portion, and a concave portion having an engaging portion on an inner peripheral surface is provided on a tip surface of the boss portion, and a tip surface of the rotary shaft is provided on a bottom surface of the concave portion. A tool for axially pulling out the propeller from a rotary shaft with respect to an underwater machine formed so as to face, and a male screw member whose front end portion is capable of abutting axially on the tip end surface of the rotary shaft of the submersible machine. A support member screwed to the male screw member, and a rear end of the support member swingably supported by the support member so as to open and close, and a front end of the inner peripheral surface of the recess of the boss portion of the propeller. A plurality of arms having a locking portion that engages with the engaging portion, and when the locking portion at the front end of the arm engages with the engaging portion on the inner peripheral surface of the recess of the boss portion by the opening operation of the arm, And a lock holding means for holding the lock in an open state. Underwater machine characterized in that the boss portion is pulled out from the rotary shaft by screwing the support member backward by the rotation of the male screw member in the state of engagement with the engagement portion on the inner peripheral surface of the recessed portion of the portion. Propeller extraction tool. 2. A propeller extracting tool for an underwater machine according to claim 1, wherein at least a front end outer surface of the arm has a shape corresponding to an inner peripheral surface of a recess of a boss portion of the propeller. Propeller extraction tool. 3. A propeller extracting tool for an underwater machine according to claim 1 or 2, wherein the locking and holding means is a pipe member axially movably supported by a male screw member. Extraction tool. 4. The propeller extracting tool for an underwater machine according to claim 1, wherein a hole is formed on a tip end surface of a rotating shaft of the underwater machine,
A propeller extracting tool for an underwater machine, characterized in that a tapered taper portion that engages with the hole portion is provided at a front end portion of the male screw member. 5. A propeller extracting tool for an underwater machine according to claim 3, wherein a retaining portion for the pipe member is provided at a front end portion of the male screw member. 6. The propeller extracting tool for an underwater machine according to claim 1, wherein a handle portion for rotating the male screw member is integrally provided at a rear end portion of the male screw member. A propeller extraction tool for underwater machinery. 7. The propeller extracting tool for an underwater machine according to claim 1, wherein the underwater machine is an underwater mixer.