JPH0271883A - Bolt cleaner - Google Patents

Abstract

PURPOSE:To excellently perform cleaning of a bolt by rotating a rotor with the bolt inserted thereinto and performing cleaning while a brushing part provided on an arm is abutted with the peripheral surface of the bolt. CONSTITUTION:The attitudes of arms 6 are properly set by presetting the positions of holding rings 8 according to the diameters of bolts A, (a) to be cleaned. In a word, in the case of large-diameter bolt A, the holding ring 8 is set at the high position so that the upper end of the arm 6 is brought into contact with the small-diameter part of a tapered face 8b. Further, in the case of the small-diameter bolt (a), the holding ring 8 is moved to the lower side so that the upper end of the arm 6 is brought into contact with the large- diameter part of the tapered face 8b. Then when compressed air is supplied to a motor 4 to rotate its output shaft, a brushing part 7 is rotated by rotation of a rotor 2 while the brushing part 7 is slid on the peripheral surfaces of th bolts A, (a). The foreign matters stuck on the bolts A, (a) are removed by the brushing part 7 and simultaneously the bolts are cleaned by polishing.

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 remove dirt and foreign matter by rubbing a metal plan against the circumferential surface, 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 the robber parts are disassembled, but bolts and nuts are also rigorously inspected. For example, when inspecting a bolt, it is necessary to remove deposits from the threaded portion and clean it by polishing.

However, if the bolts are cleaned manually using a brush or a rotating brush, there is a limit to the 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, conventional measures have been taken such as setting up a tent or the like at the work site and collecting the dust generated by the work into a processing facility using a blower or the like. However, since it is necessary to set up a tent every time the work is carried out, there is a problem in that the work efficiency is poor.

Furthermore, when working in a tent, 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 you use a dedicated cleaning device,
Since it does not have its own sealing mechanism, it must be worked inside the tent, and no improvement in work efficiency can be expected.

In order to solve these problems, the present applicant has developed a device that can efficiently clean bolts, etc. in Japanese Patent Application No. 62-2.
It has already been filed as No. 38011. This device places a rotatable rotor within a sleeve that encloses the bolt;
The bolts are inserted into the rotor and can be cleaned by polishing them with a brush provided on the horse's surface.

However, if the bolt to be cleaned is large,
The cleaning device itself also becomes larger, which increases the workload. 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 carried out while supporting the weight of the device. Therefore, if the direction of rotation when pulling out the device from the bolt is opposite to the advancement of the lead, a large force will be required and the burden will increase. Furthermore, it requires a considerable amount of effort to continue supporting the device with your arms during cleaning operations, and even if bolts can be cleaned mechanically, the degree of improvement in efficiency is not necessarily high with every mechanization. In addition to these drawbacks, since the brushes are rotated at high speed, the effects of vibration cannot be ignored, and if the device is gripped tightly by hand during work, there is a risk of occupational accidents such as white wax disease.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to carry out leaning work easily and efficiently without having to hold the device by hand by utilizing the threaded feed of the bolt.

[Means to solve the problem]

In order to achieve the above object, the cleaning device of the present invention includes a cylindrical rotor into which a bolt can be inserted in the axial direction from the open end, and the rotor is placed almost coaxially within a sleeve that is open on the same side as the open end. A driving device for driving the rotor in forward and reverse rotation is provided in the sleeve, and an arm having a brush portion that makes sliding contact with the circumferential surface of the bolt is attached to the rotor.

[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 a sleeve that forms a space closed to the outside. Further, when the drive device is rotated in forward and reverse directions, the brush is moved by the feed of the screw of the bolt, and insertion into and removal from the bolt is performed mechanically by utilizing the advance of the lead of the screw.

〔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 II in FIG. 1. In this embodiment, POL) A will be described with reference to 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 portion of Pole A, and uses a built-in cleaning mechanism to clean and polish the circumferential surface of Pole A.

The cleaning device includes a cylindrical sleeve 1 with an outer shell, and a rotor 2 disposed coaxially with the sleeve 1 inside. In order to rotatably support this rotor 2,
A base block 3 is integrated with the upper end of the sleeve 1, and the rotor 2 is connected to it by a bearing 3a built into the base block 3. 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 starting and stopping is provided, and the switch 4c is used to switch between stopping, forward rotation, and reverse rotation of the output shaft while working. . A bar 3b is provided on the outer periphery of the base block 3 for use in transporting the device and adjusting the posture with respect to port A by hand during work.

The rotor 2, which is rotationally driven by the motor 4, has a cylindrical shape with an open lower end and a circular internal cross section. Cleaning mechanisms for cleaning the circumferential surface of Pole A are provided at four locations on the outer periphery.

This cleaning mechanism is mainly composed of four arms 6 which are pivotally connected to the outer peripheral surface of the rotor 2 by means of a bottle 5 (see Fig. 2), and a brush B7 in which many small diameter steel wires are implanted is installed at the bottom. ing. The bin 5 is arranged with its axis horizontal and perpendicular to the radial direction of the rotor 2, thereby making it possible to swing the arm 6 in the vertical plane and toward the center of the rotor 2. can do. In addition,
A separate auxiliary arm 6a is pivotally attached to the tip of the arm 6 by a pin 6b, so that the posture of the brush part 7 can be changed in accordance with the outer diameter of the pole A. As a result, even when cleaning a bolt having a particularly small outer diameter, it is possible to perform work without the tip of the brush portion 7 hitting each bolt.

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. In addition, the attitude of the arm 6 can be changed by forming a tapered surface 8b having 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 lock 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 pole A to be worked on. In order to prevent damage to the screws of bolt A, the fitting part 9 is made of a hard synthetic resin material on the surface where bolt A is fitted.
a, and has a two-layer structure including a synthetic resin annular body 9b that supports the fitting portion 9a. By providing such a ring 9, the sleeve 1 can be attached to the bolt A.
can be arranged concentrically and can be easily inserted into the built-in rotor 2. Also, when the rotor 2 rotates at high speed,
The entire device may chatter or the inner wall of rotor 2 may
Smooth operation is possible without interference with the surrounding surface. Note that the inner diameter of the fitting part 9a of the ring 9 is such that there is a slight gap between it and the ring 9.

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

In the above configuration, in order to perform the cleaning work of Pole A, the device is set so that the bolt 8 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 insertion of the bolt A into the rotor 2 located inside is also quickly performed.

Here, in FIG. 1, the case where the large diameter port) A and the small diameter port) a are inserted simultaneously is shown, and the left arm 6
The right arm 6 is shown in a position for cleaning the large diameter pole (a) and the right arm 6 is shown in a position for cleaning the small diameter pole (a). By setting the position of the retaining ring 8 in advance according to the diameter of the bolts A and a to be cleaned, the posture of the arm 6 is appropriately set.

That is, in the case of a large-diameter pole) 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. Furthermore, when the diameter is small (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 a large-diameter bolt is to be attached, the arm 6 is placed in an upright position in the vertical direction, and the brush portion 7 can be applied to the circumferential surface of the bolt. Furthermore, in the case of a small-diameter bolt a, the brush portion 7 can be brought into contact with the bolt a by tilting so that the lower end of the arm 6 moves toward the center.

Next, when compressed air is supplied to the motor 4 and its output shaft is rotated, the rotation of the rotor 2 causes the brush portion 7 to rotate while slidingly contacting the circumferential surface of the poles A and a. Then, the brush portion 7 removes foreign matter adhering to the bolts A and a, and at the same time cleans them by polishing. Then, by holding the bar 3b and the handle portion 4a and gradually moving the entire device upward, the entire part A can be cleaned. Note that the rotation speed of the rotor 2 is, for example, 6.
The speed is about 00 to 1300 rpm.

The dust generated during the cleaning process is discharged from the hose 10 by the suction force of the blower 11 and disposed of at an appropriate collection facility (not shown). Note that the fitting portion 9 of the ring 9 provided at the lower end of the sleeve 1
As mentioned above, a has an inner diameter that does not come into close contact with the circumferential surface of the bolt A.

As a result, air can flow in from the gap between the sleeve 1 and the ring 9, and the suction by the blower 11 is prevented.Also, this gap is small, and the air inside the sleeve 1 is directed toward the hose 10. Since the flow is as if being sucked, dust does not leak out from between the port 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.

Also, the arm 6 is 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, the upper portion of the arm 6 is pivotally connected by the pin 5, so that the heavier lower end of the arm 6 changes its posture 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 bolt A, a to be cleaned, the brush portion 7 can polish the circumferential surface of the bolt A, a with an appropriate contact pressure. It can be cleaned by hand.

Figure 3 shows the appearance of Pol) A and a. As shown in the figure, threads run on the circumferential surfaces of the bolts A and a, and the tips of the brush portions 7 become embedded in the valleys of the threads, resulting in a leaning situation. Therefore, if the brush part 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 part 7 will move to follow the valleys and peaks of the screw. can be done. In other words, the brush portion 7 moves like a nut with respect to the bolts A and a, and can move up and down while rotating along the bolts A and a depending on the direction of rotation of the rotor 2. For this reason, switch 4C
By rotating the output shaft of the motor 4 in the forward and reverse directions, the entire cleaning device can be moved up and down relative to the stationary poles A and 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, if the operator simply grasps the handle 3Ill lightly and maintains an appropriate posture, the operator can turn on the switch 4C once.
If the brush 7 traces and cleans from the upper end to the lower end of A, a, and the direction of rotation of the rotor 2 is reversed, cleaning can be performed in the same manner from the lower end to the upper end. For this reason, there is no need to grip the cleaning device firmly in the hand when working, which greatly reduces the burden on the operator.

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 prevent the occurrence of industrial accidents. is also prevented.

By restraining and holding the arm 6 as described above, the generation of vibrations caused by high-speed rotation of the rotor 2 is suppressed compared to cleaning using only centrifugal force as described in the section of the prior art. 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 the arm 6 becomes integrated with the rotor 2, which prevents vibrations. and noise generation can be effectively suppressed.

In addition, in addition to using steel wire, the plan part 7
, A can be used as long as it has enough hardness to move the entire device following the screws in a. Further, it is possible to further enhance mechanization by arranging a plurality of poles (A, a) to be cleaned in advance and laying rails 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 to sequentially perform cleaning operations by stopping the cleaning device at positions A and a, the bolts can be cleaned 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 attachment 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. Furthermore, since the cleaning device can be operated by simply holding and supporting it in the hand, there is no fear of occupational accidents due to vibration, and it can be used in a wide range of fields.

[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 1-1 in Fig. 1, and Fig. 3 shows the external shape of a bolt. It is what has appeared. ] Ni sleeve 2: Rotor 3: Base block 4: Motor 5: Bi' 6: Arm 7: Brush part 8: Retaining ring 9: Ring 10: Hose 11 Ni blower A, a: Bolt Fig. 3

Claims (1)

[Claims] 1. A cylindrical rotor into which a bolt can be inserted in the axial direction from the open end is housed almost coaxially in a sleeve that is open on the same side as the open end, and the rotor is driven in the sleeve in forward and reverse rotation. A bolt cleaning device characterized in that a drive device is provided and an arm having a brush portion that makes sliding contact with the circumferential surface of the bolt is attached to the rotor.