JPH0466625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device for cleaning the surface of a bolt.

[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, if the bolt to be cleaned is large, the cleaning device itself will also be large and the work load will increase. For example, in the case of a stud bolt in a vertical position, it is necessary to move the device up and down, so the work must be done while supporting the weight of the device, and efficiency cannot be expected if the work is done manually. Further, if the cleaning device rotates in only one direction, and the brush advances in the opposite direction to the lead direction of the screw, not only a large drag force is generated but also vibrations increase. For this reason, when continuing work while applying the brush along the threaded part, if the direction of rotation of the brush does not match the lead of the screw, the work load will increase, fatigue will increase, and vibrations will be transmitted to the hands, causing labor. It is also unfavorable from a hygiene perspective.

Furthermore, if the brush rotates in one direction, the position of the brush that touches the ridges and troughs of the screw does not change, and even if one side of the ridge can be cleaned, dirt remains on the other side.

Further, even if the cleaning is performed well, if the generated dust and the like are scattered in the air, the working environment will be poor. In particular, the scattering of radioactive materials is an important problem when cleaning bolts of turbines, etc. in nuclear power plants, and improvements in this aspect are also needed.

Therefore, the present invention makes it possible to work easily by simply holding the device lightly by hand by utilizing the screw thread of the bolt, and also to clean the device well.It also prevents dust from scattering and improves the work environment. The purpose is to promote conservation.

[Means to solve the problem]

In order to achieve the above object, the cleaning device of the present invention has a rotor rotatably disposed substantially coaxially inside a sleeve with one end open, and a drive device for driving the rotor in forward and reverse rotation. , an arm having a brush part for bolt cleaning is attached to the rotor.

Further, a suction device for suctioning and exhausting air from inside the sleeve may be connected in communication with the sleeve so that cleaned dust and the like can be collected without being scattered outside.

[Effect]

By rotating the rotor into which the bolt is inserted, a brush section provided on the arm is brought into contact with the circumferential surface of the bolt to clean it, and this work is carried out within the sleeve, which forms a space closed to the outside. In addition, if the drive device is rotated in forward and reverse directions, the brush moves according to the feed of the screw of the bolt, and movement in the direction of insertion into and removal from the bolt is performed mechanically by utilizing the advance of the lead of the screw. It will be held in

Further, when the suction device connected to the cleaning device is operated, the dust generated by the cleaning can be sucked and exhausted from the sleeve to the collection device, etc., and the problem of environmental deterioration due to the scattering of dust can be solved.

〔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.

Bolts A are fixed to the turbine casing at a constant pitch. Then, the cleaning device covers the entire bolt A, and uses a 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.

The motor 4 has a structure that allows its output shaft to rotate forward and reverse at high speed by supplying compressed air. A compressed air supply hose 4b is connected to the handle portion 4a, and a switch 4c for activation and deactivation is provided.
Work while switching between stop, forward rotation, and reverse rotation of the output shaft. In addition, base block 3
There is a bar 3b on the outer periphery of the bar 3b that can be grasped by hand during work to transport the device and adjust the posture with respect to the bolt A.
Set it up.

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 its 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 screws of the bolt A from being damaged, the surface on which the bolt A is fitted is made of a hard synthetic resin fitting part 9a, and the fitting part 9a is made of a synthetic resin material that supports the fitting part 9a. It has a two-layer structure having an annular body 9b. By providing such a ring 9, the sleeve 1 can be arranged concentrically with respect to the bolt A, and can be easily inserted into the built-in rotor 2. Also, rotor 2
Even when rotating 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 portion 9a of the ring 9 is set such that there is a slight gap between it and the bolt A.

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 a blower 11 installed separately from the cleaning device is connected to the hose 10 as a suction 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.

Figure 3 shows the external appearance of bolts A and a. As shown in the figure, threads run on the circumferential surfaces of the bolts A, a, and the cleaning situation is such that the tip of the brush portion 7 is embedded in the troughs. For this reason,
If the material of the brush portion 7 is made of a relatively hard material such as steel wire as described above, when the rotor 2 rotates, the tip of the brush portion 7 can be moved to follow the valleys and peaks of the screw. can. In other words, the brush portion 7 moves like a nut with respect to the bolts A, a, and can move up and down while rotating along the bolts A, a depending on the direction of rotation of the rotor 2. Therefore, when the output shaft of the motor 4 is rotated forward and reverse by the switch 4c, the bolt A, which is stationary,
The entire cleaning device can be moved up and down with respect to a.

In this way, by utilizing the valleys or ridges of the threads of the bolts A, a, the cleaning device can be automatically raised and lowered while rotating around the bolts A, a. Therefore, once the operator turns on the switch 4c by lightly grasping the handle 3b and adjusting the posture, the brush 7 traces and cleans from the upper end to the lower end of the bolts A and a, and the rotor 2 rotates. If you reverse the direction, you can clean from the bottom end to the top end in the same way. For this reason,
There is no longer a need to grip the cleaning device tightly with the hands, and the burden on the operator is greatly reduced.

In addition, during cleaning work, all you have to do is hold the equipment lightly in your hand and maintain an appropriate posture, so even if the equipment generates strong vibrations, it will not have any effect on the worker and will reduce the risk of industrial accidents. is also prevented.

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 addition to using steel wire, the brush part 7 can be made of
Any material may be used as long as it has enough hardness to move the entire device by following the threads of the bolts A and a. Further, it is possible to further enhance mechanization by arranging a plurality of bolts A, a to be cleaned in advance and laying a rail or the like so that the cleaning device can run in the direction of the arrangement. in this case,
If a control system is provided that sequentially performs the cleaning operation by stopping the cleaning device at the respective positions of the bolts A and a, it becomes possible to clean the bolts even more efficiently.

〔Effect of the invention〕

As explained above, in the cleaning device of the present invention, the brush portion is moved in the axial direction while rotating like a nut, following the threads of the bolt. Therefore, by rotating the rotor in the forward and reverse directions by the drive device, the cleaning device can be moved forward and backward in the axial direction of the bolt via the brush portion. Therefore, by simply holding the cleaning device lightly in the hand and adjusting its posture with respect to the bolt, cleaning can be automatically performed by making good use of the progress of the screw lead of the bolt, thereby reducing the burden on the operator. In addition, since the cleaning device can be operated by simply holding and supporting it in the hand, there is no fear of industrial accidents due to vibration, and it can be used in a wide range of fields.

Furthermore, by connecting a suction device to the sleeve, dust and the like generated during cleaning can be sent to the collection equipment, and the dust is not released into the atmosphere. Therefore, even when cleaning the bolts of nuclear power equipment, the environment is not degraded and the working environment can be maintained.

[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, Fig. 2 is a cross-sectional view of the device taken along the - line in Fig. 1, and Fig. 3 shows the bolt in external form. It is something. 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, and a drive device for driving the rotor in forward and reverse rotation is provided in the sleeve, and has a brush portion for bolt cleaning. A bolt cleaning device characterized in that an arm is attached to the rotor. 2. The bolt cleaning device according to claim 1, further comprising a suction device for sucking and exhausting air from the inside of the sleeve, the suction device being communicatively connected to the sleeve.