JPH0466624B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device for cleaning cylindrical bodies such as bolts, shafts, or pins.

[Conventional technology]

2. Description of the Related Art Various bolts and nuts are used as means for joining members in general industrial machines and mechanical structures used for special purposes. In order to inspect or replace the parts connected to these bolts and nuts, it is common to remove the bolts and clean the threaded parts. The easiest way to clean such bolts is to rub the circumferential surface with a metal brush or the like to remove dirt and foreign matter, and this work has traditionally been done manually. Additionally, the company aims to improve efficiency by developing specialized cleaning devices for specific bolts, for example.

[Problem to be solved by the invention]

By the way, boilers, nuclear reactors, steam turbines, and their peripheral equipment related to thermal power generation and nuclear power generation are periodically inspected based on legal regulations or voluntarily. During this inspection work, not only mechanical parts are disassembled, but bolts and nuts are also subject to strict inspection. For example, when inspecting a bolt, it is necessary to remove deposits from the threaded portion and clean it by polishing.

However, if you clean the bolts manually using a brush or rotating brush,
There is a limit to work efficiency. Further, even if a dedicated cleaning device is used for the work, scattering of dust generated during the work cannot be avoided. Particularly in the case of nuclear power generation, if dust is generated during work, the problem of radioactive contamination becomes serious, and it is necessary to avoid this as much as possible.
For this reason, in the past, tents etc. were set up at the work site.
Measures are being taken to collect the dust generated by the work into a processing facility using blowers, etc. However, since it is necessary to set up a tent every time we work,
The problem is that the workability is poor.

Furthermore, when working with a tent set up, the only work that can be done is cleaning the bolts that have been removed from the mechanical structure. For example, in the case of something that cannot be transported to a working position, such as a stud bolt for a turbine casing, it is necessary to newly install a tent in the area surrounding the bolt. Furthermore, even if a dedicated cleaning device is used, since it is not equipped with a sealing mechanism, it is necessary to work inside the tent, and no improvement in workability can be expected.

To address these problems, the present applicant has already filed an application in Japanese Patent Application No. 62-238011 (Japanese Unexamined Patent Publication No. 64-80480) for an apparatus capable of efficiently cleaning bolts and the like. In this device, a rotatable rotor is disposed within a sleeve that encloses the bolt, and the bolt is inserted into the rotor, and the bolt can be cleaned by polishing the bolt with a brush provided on the circumferential surface.

However, by pivoting an arm around the rotor and utilizing the centrifugal force acting on this arm,
It has a structure in which the brush is applied to the circumferential surface of the bolt. For this reason, when the rotor rotates at high speed, the arm is essentially a free end, so vibrations are generated considerably. In other words, since the arm becomes the mass point,
Depending on the rotational speed of the rotor, the arm length, etc., resonance may occur, causing the entire device to vibrate greatly. Therefore, when working by holding the handle of the device by hand, there is a problem that not only does the burden on the worker increase, but also the generation of noise and the destruction of the device itself.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to efficiently clean a cylindrical body such as a bolt, and to suppress the vibration of the device so that the work can be carried out easily.

[Means to solve the problem]

In order to achieve the above object, the cleaning device of the present invention has a rotor rotatably provided substantially coaxially inside a sleeve with one end open, and a drive device for driving the rotor is provided in the sleeve.
The base end of an arm having a brush portion is attached to the rotor, the arm is vibrated in the radial direction of the rotor, and a retaining ring for restraining the posture of the arm is provided on the circumferential surface of the rotor. do.

[Operation] By rotating the rotor into which the bolt is inserted, the brush part provided on the arm is applied to the circumferential surface of the bolt to clean it, and this work is performed inside the sleeve that forms a space closed to the outside. be exposed. Further, one end of the arm is restrained by a retaining ring, so that the arm does not swing violently when the rotor rotates in a restrained manner, and generation of vibration and noise is suppressed.

〔Example〕

Hereinafter, features of the present invention will be specifically explained with reference to embodiments shown in the drawings.

FIG. 1 is a longitudinal cross-sectional view showing a working situation of a cleaning device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the device taken along the - line in FIG. 1. In this embodiment, the bolt A will be described as a stud bolt fixed to the turbine casing.

Bolt A is fixed to the turbine casing at a constant pitch. Then, the cleaning device covers the entire bolt A, and uses the built-in cleaning mechanism to clean and polish the circumferential surface of the bolt A.

The cleaning device has a cylindrical sleeve 1 as an outer shell member, and a rotor 2 inside the sleeve 1.
It is placed coaxially with. In order to rotatably support the rotor 2, a base block 3 is integrated into the upper end of the sleeve 1, and a bearing 3 built into the base block 3 is integrated into the upper end of the sleeve 1.
The rotor 2 is connected by a. Furthermore, a motor 4 using air pressure for rotationally driving the rotor 2 is disposed above the base block 3. This motor 4 has a structure that rotates its output shaft at high speed by supplying compressed air.
A compressed air supply hose 4 is attached to the handle portion 4a.
b and is also provided with a switch 4c for activation and deactivation. In addition, base block 3
A bar 3b is provided on the outer periphery of the bar 3b, which is grasped by hand during work to transport the device and adjust its posture with respect to the bolt A.

The rotor 2 rotationally driven by the motor 4 is
It has a circular cylindrical cross section with its lower end open. Cleaning mechanisms for cleaning the circumferential surface of the bolt A are provided at four locations on the outer circumference.

This cleaning mechanism is mainly composed of four arms 6 that are pivotally connected to the outer circumferential surface of the rotor 2 by pins 5 (see Figure 2), and has a brush section in which many small diameter steel wires are implanted in the lower part. There are 7. The pin 5 is arranged with its axis horizontal and perpendicular to the radial direction of the rotor 2, thereby allowing the arm 6 to swing in a vertical plane and toward the center of the rotor 2. It can be made possible. In addition,
A separate auxiliary arm 6a is pivotally attached to the tip of the arm 6 via a pin 6b, so that the posture of the brush portion 7 can be changed in accordance with the outer diameter of the bolt A. As a result, even when cleaning a bolt having a particularly small outer diameter, it is possible to perform work without causing uneven contact of the tip portion of the brush portion 7.

Furthermore, a retaining ring 8 is provided around the outer periphery of the rotor 2 to restrain the upper end of the arm 6. This retaining ring 8 is rotatably screwed onto the rotor 2 by a screw 8a connection, and is moved in the axial direction of the rotor 2 by the rotation. Further, the attitude of the arm 6 can be changed by forming a tapered surface 8b with a smaller diameter on the surface facing the arm 6 side, and by abutting the inner wall of the upper end of the arm 6 against this tapered surface 8b. A locking bolt 8c is provided on the upper peripheral wall of the retaining ring 8, thereby fixing the retaining ring 8 at a predetermined position on the rotor 2.

Further, a ring 9 is provided on the inner periphery of the lower end of the sleeve 1 for aligning with the bolt A and for making the inside of the sleeve 1 a substantially closed space. This ring 9 has an inner diameter that corresponds to the outer diameter of the bolt A to be worked on. In order to prevent the threads of bolt A from being damaged, the surface on which bolt A is fitted is made of a hard synthetic resin fitting part 9a, and a metal part supporting this fitting part 9a is made. It has a two-layer structure with an annular body 9b. By providing such a ring 9, the sleeve 1 can be arranged concentrically with respect to the bolt A, and the built-in rotor 2 can be arranged concentrically with respect to the bolt A.
Easy to insert inside. Further, even when the rotor 2 rotates at high speed, the entire device can operate smoothly without chatter or interference between the inner wall of the rotor 2 and the circumferential surface of the bolt A. Note that the inner diameter of the fitting part 9a of the ring 9 has a slight angle between it and the bolt A.
Make it something that will give you some time.

Furthermore, a hose 10 is connected to the sleeve 1 for disposing of dust and the like generated during cleaning work to the outside. A flexible hose 10 is used, and the hose 10 is connected to a suction blower 11 installed separately from the cleaning device.

In the above configuration, in order to perform a cleaning operation on the bolt A, the apparatus is set so that the bolt A is inserted through the ring 9 at the lower end of the sleeve 1. At this time, since the sleeve 1 can be aligned with the bolt A by the ring 9, the bolt A can be quickly inserted into the rotor 2 located inside.

Here, FIG. 1 shows the case where a large diameter bolt A and a small diameter bolt a are inserted at the same time,
The left arm 6 is shown in a position for cleaning the large diameter bolt A, and the right arm 6 is shown in a position for cleaning the small diameter bolt A. By setting the position of the retaining ring 8 in advance according to the diameter of the bolts A, a to be cleaned, the posture of the arm 6 is set appropriately.
That is, in the case of a large-diameter bolt A, the retaining ring 8 is set at a high position so that the upper end of the arm 6 hits the small-diameter portion of the tapered surface 8b. Also,
When using a small diameter bolt a, the retaining ring 8 is moved downward so that the upper end of the arm 6 comes into contact with the large diameter portion of the tapered surface 8b. By such an operation, when the bolt A has a large diameter, the arm 6 stands up in the vertical direction, and the brush portion 7 can be brought into contact with the circumferential surface of the bolt A. In the case of a small-diameter bolt a, the lower end of the arm 6 is tilted so that the brush part 7 is moved toward the center of the bolt a.
can be applied to.

Next, when compressed air is supplied to the motor 4 to rotate its output shaft, the rotation of the rotor 2 causes the brush portion 7 to rotate while slidingly contacting the circumferential surfaces of the bolts A, a. Then, the brush part 7 removes the bolts A and a.
At the same time, remove foreign matter adhering to the surface and clean it by polishing. Then, by holding the bar 3b and the handle portion 4a by hand and gradually moving the entire device upward, the entire bolt A can be cleaned. Note that the rotation speed of the rotor 2 is, for example,
It is about 600 to 1300 rpm.

Dust and the like generated during such a cleaning process are discharged to the outside from the hose 10 by the suction force of the blower 11 and disposed of at an appropriate collection facility (not shown). The fitting portion 9a of the ring 9 provided at the lower end of the sleeve 1 has an inner diameter that is large enough to prevent it from coming into close contact with the circumferential surface of the bolt A, as described above. As a result, air can flow in from the gap between the bolt A and the ring 9, and suction by the blower 11 can be performed without any problem. Further, since this gap is small and the air inside the sleeve 1 flows in the direction of the hose 10 as if being sucked, dust does not leak out from between the bolt A and the ring 9. Therefore, the dust generated during the cleaning work does not leak to the outside, making it possible to improve the working environment and solving the problem of radioactivity during maintenance and inspection work on equipment using nuclear power.

In addition, the arm 6 is attached to the bolt A to be cleaned,
It is maintained in a fixed posture by a retaining ring 8 according to the diameter of a. That is, when the rotor 2 rotates, since the upper portion of the arm 6 is pivotally connected by the pin 5, the lower end side, which has a heavier mass, changes its attitude so as to open outward due to centrifugal force. In response to this change in attitude, the upper end of the arm 6 changes its attitude inward, and the upper end abuts against the tapered surface 8b of the retaining ring 8, thereby restricting the overall attitude of the arm 6. Therefore, if the position of the retaining ring 8 is appropriately set according to the outer diameter of the bolts A, a to be cleaned, the brush portion 7 can polish the circumferential surface of the bolts A, a with an appropriate contact pressure. It can be cleaned.

By restraining and holding the arm 6 as described above, the occurrence of vibrations caused by high-speed rotation of the rotor 2 is suppressed compared to cleaning using only centrifugal force as described in the prior art section. . In other words, the arm 6 is a swinging member pivotally connected to the rotor 2 by the pin 5, but during operation, the retaining ring 8 restrains the upper end of the arm 6 and it becomes integrated with the rotor 2. , the generation of vibration and noise can be effectively suppressed.

In the embodiment, the bolts A and a are of a built-in type fixed to the structure, but the apparatus of the present invention can also be applied to the case of cleaning the bolts alone. In other words, if the bolt is placed in an upright or horizontal position using a jig or the like for fixing the bolt, cleaning work can be carried out in exactly the same manner as described above.

In addition to bolts, work objects include mechanical elements such as pins and shafts. For the brush portion 7, instead of using steel wire, wires made of stainless steel, brass, etc., or nylon wires can be used, and the brush portion 7 may be selected from wires suitable for the member to be cleaned.

〔Effect of the invention〕

As explained above, in the cleaning device of the present invention, a rotor is provided inside the sleeve that encloses the cylindrical body including the space around the cylindrical body, and a rotor is provided on the arm at the same time as the rotor rotates. The brush portion is brought into contact with the circumferential surface of the cylindrical body. Therefore, compared to the conventional case of relying on manual work, the process becomes simpler and more efficient. In particular, for mechanical structures that require uniformity of cleanliness through cleaning, it is possible to finish each bolt, etc. to a uniform degree of cleanliness, ensuring that work meets specified conditions through inspection and management. can be done. Further, since the cylindrical body to be cleaned is surrounded by the sleeve, generated dust and the like will not be spread, and the working environment can be improved. Furthermore, since the posture of the arm is fixedly restrained by the retaining ring, there is no shaking or vibration due to centrifugal force even when the arm rotates at high speed, making handling easier and preventing equipment damage due to resonance etc. be done.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a working state of a cleaning device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the device taken along the - line in FIG. 1: Sleeve, 2: Rotor, 3: Base block, 4: Motor, 5: Pin, 6: Arm, 7: Brush section, 8: Retaining ring, 9: Ring, 10: Hose, 11: Blower, A, a :bolt.

Claims (1)

[Claims] 1. A rotor is rotatably provided substantially coaxially inside a sleeve with one end open, a drive device for driving the rotor is provided in the sleeve, a proximal end of an arm having a brush portion is attached to the rotor, and the arm is A cleaning device for a cylindrical body such as a bolt, characterized in that the rotor is swingable in the radial direction, and further includes a retaining ring provided on the circumferential surface of the rotor to restrain the posture of the arm.