JPS632667A - Polishing tool - Google Patents

Abstract

PURPOSE:To prevent the scattering of dust and carry out highly accurate polishing by providing a bellows type suction hood opposite to the rotating direction of a cylindrical polishing body and close to the surface of said polishing body in the rearward position of a workpiece contact position. CONSTITUTION:A cylindrical polishing body 16 is moved in the direction of the arrow P to approach a polishing surface 54 while being rotated in the direction of the arrow by means of a motor 4, and moved in the Q direction to carry out polishing. And, the dust on the surface layer of a workpiece which is removed by polishing is sucked from the opening part 64 of a suction hood 62 which is moved together with the polishing body 16. The suction hood 62 is formed in a bellows type and, thereby, the length of the opening part 64 in the axial direction of the polishing body 16 is expandable and contractible in accordance with the width of the polishing surface 54 by means of a cylinder 68, with the opening part 64 being positioned rearward with respect to the rotation of the polishing body 16. Thereby, highly efficient polishing can be carried out while sufficiently preventing the scattering around of dust even when polishing a complex form of workpiece.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polishing tool, and more particularly to a polishing tool for removing a relatively easily peeled adhesion layer present on the surface of an object. Such polishing tools are suitably used, for example, to remove surface layers of paint films that have deteriorated over time.

[Prior Art and its Problems] Conventionally, the exteriors of various structures and buildings have been widely painted for the purpose of surface protection and aesthetic improvement. However, when exposed to the external environment for a long period of time, the surface of the paint film gradually deteriorates and becomes brittle (for example, chalking occurs).
As described above, the functionality of the paint film gradually deteriorates over time, so repairs are generally performed periodically. During repair, the chalking layer, which is about 5 to 50 pm thick, is removed to expose the effective paint film underneath, and a new paint film is formed on top of it.

Conventionally, the removal of the chalking layer as a pre-process for such repair painting has been carried out on-site using a polishing tool that rotates or reciprocates an abrasive material with abrasive grains supported on a relatively soft carrier. The polishing operation was performed by an operator pressing the tool against the surface to be polished.

By the way, in the above-mentioned polishing, the surface of the object to be polished is removed and becomes dust, which is scattered around. This dust scattering not only deteriorates the working environment but also the surrounding environment and may cause pollution.

In order to prevent dust from scattering during polishing, it is most preferable to completely cover the area around the polishing position, but in reality, such a solution is only useful when the object to be polished is extremely limited (e.g. In particular, in the case of objects to be polished such as large bridges, the surface to be polished has an extremely complex shape, and it is difficult to use the polishing tool. Since the position and posture of the tool must be changed frequently and access must be made so that the tool comes into contact with the surface to be polished each time, one or more dust scattering prevention measures often become an obstacle to the polishing work. It cannot be said to be effective.

In addition, it is difficult to improve the efficiency of the above polishing work by operators, and it is not suitable for polishing large areas. It is conceivable to hold a polishing tool and automatically access the surface to be polished and move the tool while in contact with the surface to be polished. In this case, the same problem of dust scattering as described above occurs.

The above-mentioned problems become more prominent when attempting to increase the efficiency of polishing by increasing the moving speed of the polishing tool by the manipulator.

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned conventional problems, prevents dust from scattering from the surface to be polished to the surrounding area, and performs highly efficient polishing even for objects with complex shapes. The purpose is to provide a polishing tool that can

[Means for Solving the Problems] According to the present invention, in order to achieve the above-mentioned objects, there is provided a cylindrical abrasive material rotated by a driving means, and an object to be polished with respect to the direction of rotation of the abrasive material. The suction hood is characterized by having a suction hood that opens in a long and narrow manner along the rotational axis of the abrasive material close to the surface of the abrasive material so as to face the direction of rotation of the abrasive material at a position rearward from the contact position. A polishing tool is provided.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1(a) is a schematic front view showing one embodiment of a polishing tool according to the present invention, and FIG. 1(b) is a schematic side view in cross section of the - section.

In these figures, 16 is a cylindrical abrasive material,
The abrasive material may rotate about a horizontal axis of rotation. An example of the abrasive material is one in which abrasive grains such as emery or garnet are dispersed and fixed in a roll body formed from a nonwoven fabric made of nylon or the like. The rotating shaft is connected to a driving rotating shaft of the motor 4. The motor is held in suitable holding means 5, which is supported by a support arm 8.

62 is a suction hood, and the suction opening 64 of the hood has an elongated shape along the direction of the rotation axis of the abrasive material 16. The suction hood 62 is connected to a suction source via a duct 66. The suction hood is of a bellows type,
It runs without being able to expand or contract along the horizontal direction. Therefore, hood 6
The opening length of No. 2 is IJrf. In order to drive the expansion and contraction of the hood 62, a hood slide mechanism is provided at the bottom of the hood. The mechanism includes a hydraulic cylinder 68 connected to the support arm 8, a piston rod 70 partially housed within the cylinder so as to be movable in the horizontal direction, and a connection fixed to the tip of the rod. member 72
, guide rods 74.75 in the horizontal Y direction parallel to each other, a guide 76 that can slidably support these rods along the horizontal direction, and mounting members 78, 79, 80, 81.8.
It consists of 2. The attachment members are attached to the lower part of the suction hood 62 at predetermined intervals. The guide 76 is fixed to the support arm 8, and the duct 66 is fixed to the guide. Further, in the mounting, the member 78 is fixed to the connecting member 72, and the other connecting members are slidably connected to the guide rods 74, 75.

As shown in FIG. 1(b), the abrasive material 16 is rotated in the direction of the arrow, and the abrasive material 16 is rotated in the direction of the arrow, and
accessed in the orientation. Therefore, the opening 64 of the suction hood is positioned rearward in the direction of rotation of the abrasive 16 with respect to the polishing 8 position. separated by an appropriate distance. In addition, when polishing a normal polished surface, the suction hood 6
The hood 2 is used when it is stretched to its maximum length (indicated by the two-dot chain line in FIG. If the hood 62 becomes a hindrance, the piston rod 70 can be moved in the direction of the arrow by the cylinder 68 of the hood slide mechanism to shorten the hood 62 appropriately.

FIG. 2 is a schematic side view showing a polishing system using the polishing tool of the above embodiment.

In the figure, reference numeral 86 indicates an object to be polished, and reference numeral 88 indicates a traveling carriage, which is movable back and forth in a direction perpendicular to the paper plane of FIG. A lifting bag 90 is fixed on the trolley,
The lifting bag can be expanded and contracted in the vertical direction. A traveling cart 92 is disposed above the lifting bag, and the cart reciprocates in the horizontal direction of the arrow. A plurality of arms of a manipulator connected to a support arm 8 for a polishing tool are interposed on the trolley, and a plurality of arms of a manipulator are arranged so as to be rotatable in the direction of the arms or in a direction perpendicular to the arms. It is connected. The direction of relative rotation between these arms is indicated by arrows.

A duct 66 whose one end is connected to the suction tool 162
The other end is connected to the inlet of a cyclone 94, the outlet of the cyclone is connected to the inlet of a bag filter 96, and the outlet of the bag filter is connected to a Roots blower 98.

While rotating the abrasive material 16 by the motor 4 as described above, the movable parts of the polishing tool support mechanism are appropriately driven to access the abrasive material in the direction of the arrow P facing the surface to be polished. .

At the same time, the blower 98 is operated. As shown in FIG. 1(b), when the abrasive material 16 comes into contact with the surface to be polished 54 and polishing is performed, the dust of the coating film peeled off and removed by the polishing is absorbed into the suction opening 64 of the suction hood 62. The air is blown away, and the air is sucked into the opening 64 by the suction force generated by the operation of the blower 98. Note that the polishing tool support mechanism moves the polishing material 16 in the direction of arrow Q, and polishing is continued. The dust sucked into the suction hood 62 passes through the duct 66, passes through the cyclone 96 and the bag filter 96, and is collected, and clean air is discharged from the outlet of the blower 98.

In addition to the dust collecting means shown in FIG. 2, venturi scrubbers, electric dust collectors, and the like may be used alone or in appropriate combinations.

When the object to be polished is a complex-shaped object such as an H-shaped steel material, the length of the suction hood 62 in the water direction is shortened as described above when polishing a narrow part such as the inner surface of the object to be polished. This prevents the suction hood 62 from colliding with the object to be polished when accessing the abrasive material 16, and when polishing a surface to be polished that has no obstructions when accessing the abrasive material, the suction hood 62 is The suction efficiency can be improved by extending the directional length. It is preferable that the suction hood be expanded and contracted automatically in accordance with the movement of the material to be polished in a predetermined polishing process. Teaching that also includes expansion and contraction is sufficient.

FIG. 3 is a partially cutaway schematic perspective view showing a modified example of the suction hood in the polishing tool of the present invention.

This example differs from the one shown in FIG. 1 mainly in that the suction hood main body is not a bellows type but a three-stage telescopic tube type.

FIG. 4(a) is a schematic cross-sectional view showing an example of an abrasive material support structure used in a polishing tool according to the present invention, and FIG.
b) is its BB sectional view.

In these figures, 2 is a drive rotation shaft.

A driving motor 4 is connected to one end of the shaft. The rotating shaft 2 is supported by a support arm 8 via a bearing 6. A sleeve 10 is placed over and fixed to the longitudinal center of the rotating shaft. A number of leaf springs 12 are connected to the outer surface of the sleeve. The leaf spring is arranged so that its surface runs along the direction of the shaft 2, and extends radially outward substantially along the radial direction of the shaft 2. As shown in FIG. 4(b), a plurality of leaf springs 12 are arranged symmetrically around the axis 2, with one or more leaf springs 1 having one or more ends connected to the sleeve 10.
The other end of 2 is connected to the inner surface of a cylindrical drum 14. #The drum 14 is arranged around the shaft 2 and coaxially therewith.

As shown in FIG. 4(b), all the leaf springs 12 are bent and a predetermined stress is stored therein. A first abrasive material 16 is attached to the outer surface of the drum 14. The abrasive material has a cylindrical shape.

Ring-shaped plates 18.degree. 18a are attached to both end surfaces of the abrasive material 16. The plate has an outer diameter slightly smaller than the diameter of the first abrasive material 16, and is fixed in position so as not to protrude from the abrasive material. FIG. 4(C) is a front view of the ring-shaped plate 18. As shown in FIG. 4, small through holes 20 are formed in the plate at equal intervals.

Close to both ends of the sleeve 10 and on the outer surface of the shaft 2, a disk body 22.22a perpendicular to the shaft is fixed. The diameter of the disk body is smaller than the outer diameter of the first abrasive material 16, and the disk body is smaller than the outer diameter of the first abrasive material 16.
It is arranged so as to be close to ring-shaped plates 18.18a provided at both ends of the ring. And the disk body 22.2
The ring-shaped plates 18 and 18 are provided on the outer periphery of 2a, respectively.
A pin 24 is attached that can be engaged with each small through hole 20 of a with a suitable margin.

A disk-shaped second abrasive material 26 is fixed to the end of the drive rotation shaft 2 on the side opposite to the motor 4 side. Note that the second abrasive material is attached to a substrate 28, and the substrate is fixed to the shaft 2 by a set port 30. The second
The diameter of the abrasive material is smaller than the diameter of the first abrasive material 16.

As can be seen from the above explanation, the first abrasive material 16 (and the drum 14 and the ring-shaped plates 18, 18a) is attached to the leaf spring 1.
By deforming 2, it is possible to move relative to the shaft 2 within the margin of engagement between the small through hole 20 of the ring-shaped plate and the pin 24 of the disk. The outer diameter of the second abrasive material 26 is set so that even when the first abrasive material 16 moves in this way, there is no part located outside the first abrasive material.

FIGS. 5(a) to 5(c) are diagrams for explaining tool access in a direction perpendicular to the drive rotation axis during polishing with a polishing tool using the abrasive support structure described above.

FIG. 5(a) is a diagram showing the reference position of access of the polishing tool to the surface to be polished. In FIG. The position of the abrasive material 16 is at the X position as shown by the solid line. Furthermore, with respect to the position of the rotation axis 2 of the tool, the position of the first abrasive material 16 in a state where the tool is deformed to the maximum extent by the deformation of the leaf spring due to an external force is a position Y indicated by a dotted line. Abrasive material 16 from the center of shaft 2 in this Y state
If the shortest distance to the outer surface of the abrasive material 16 is Ll, and the distance from the center of the shaft 2 to the outer surface of the abrasive material 16 in the state of X is L2, then L shown from the shaft 2 = (LL +L2
)/2 is set as the reference position for access.

Incidentally, L2-Ll can easily cover the reproducing accuracy range (about 4 mm) of position control of the manipulator, and can be made considerably wider than this range. Therefore, due to errors in manipulator control, even when accessing a position closer than the reference position as shown in FIG. 5(b), LL < x
, so that the abrasive material 16 is brought into contact with the surface to be polished 54 with a moderate force due to the deformation of the leaf spring 12. Also,
Due to errors in manipulator control, even when accessing a position farther than the reference position as shown in Figure S5 (C),
Since L2>12, the plate spring 12 is deformed and brought into contact with the surface to be polished 54 with a force that is not too small.

FIG. 6 is a diagram for explaining the movement of an abrasive during polishing by a polishing tool using the abrasive support structure described above.

In the tool accessed as described above, the rotary shaft 2 is driven to rotate by the motor 4, and the rotational force is transmitted to the first abrasive material 16 via the disk body 22.22a fixed to the shaft. Rotate in the direction of the arrow. The tool as a whole is moved in the direction of arrow W along the surface to be polished 54 by the manipulator. As shown in FIG. 6, the surface to be polished is a painted surface consisting of a plurality of layers, the uppermost layer of which is a chalking layer 56 that is relatively brittle and easily peeled off. Even if the surface to be polished 54 is flat, it usually has slight irregularities as shown in the figure, but the first abrasive material 16 is pressed by the leaf spring to follow the irregularities on the surface, so that only the chalking layer 56 is completely formed. In the above embodiment, in order to reliably transmit the rotational force from the driving rotation @2 to the first abrasive material 16, a ring-shaped Plate 18.18a
Although the driving force is transmitted to the plate spring 12, the rotational force may be transmitted only by the plate spring 12 as long as some slippage with respect to the surface to be polished is allowed.

Incidentally, when polishing a surface to be polished consisting only of a relatively flat surface without corners using the polishing tool of the above embodiment, it is also possible to remove the second polishing material 26 and perform the polishing.

According to the above-described abrasive material support structure, the cylindrical abrasive material is held on the drive rotating shaft via the plate spring, so the permissible range of relative position to the surface to be polished during access and movement during grinding. becomes larger, which allows easy and good automatic mechanical access to the surface to be polished, even for complex-shaped objects, and enables high-efficiency polishing with sufficient uniformity. .

FIG. 7(&) is a schematic cross-sectional view showing an example of an abrasive support structure used in the Ryokun tool according to the present invention.
b) ° is the BB sectional view.

In these figures, the same members as in FIG. 4 above are given the same reference numerals.

In FIG. 7, a plurality of inner ring-shaped plates 10' are attached to the longitudinal center of the rotating shaft 2 at regular intervals. These plates are all arranged perpendicularly to the shaft 2, and are fixed by passing through the inner surface of the ring with the shaft 2. A plurality of outer ring-shaped plates 12' are provided substantially coaxially with each of these inner ring-shaped plates 10'. That is, the ring outer surface of the inner ring-shaped plate lO' and the ring inner surface of the outer ring-shaped plate 12' are arranged ff12t so as to face each other with a predetermined distance maintained therebetween.

A plurality of coil springs 14' each having a length direction in the radial direction of the shaft 2 are arranged radially between these corresponding inner and outer ring-shaped plates. As shown in FIG. 7(b), the plurality of coil springs 14' are arranged symmetrically around the axis 2. Incidentally, it is preferable that the coil spring 14' is stretched to some extent and a predetermined stress is accumulated therein.

A first abrasive material 16 is attached to the outer surface of the outer ring-shaped plate 12' in common to all plates.

FIG. 8(a) is a schematic cross-sectional view showing an example of an abrasive material support structure used in a polishing tool according to the present invention, and FIG.
b) is its BB sectional view.

In these figures, the same members as in FIG. 4 above are given the same reference numerals.

In FIG. 8, an elastic body 10'' made of rubber or the like is attached around the longitudinal center of the rotating shaft 2. As shown in FIG. 8(b), the elastic body 10'' It has a cylindrical shape, and a through hole corresponding to the shaft 2 is formed in the center. A vehicle 2 is inserted into the through hole, and the shaft 2 and the elastic body 10'' are joined with an adhesive.A first abrasive material 16 is attached to the outer surface of the elastic body 10''. ing. The abrasive material has a cylindrical shape, and the outer surface of the elastic body 10'' is bonded to the inner surface of the abrasive material with an adhesive.

As the elastic body, it is also possible to use other materials such as a deformable bag having a shape similar to the outer shape of the elastic body 10'' and filled with a liquid such as wood or a gas such as air. be.

The abrasive material support structure shown in FIGS. 7 and 8 above has the same effect as the support structure shown in FIG. 4 above.

[Effects of the Invention] According to the present invention as described above, when a cylindrical abrasive material is pressed against the surface to be polished without being driven and rotated, the dust on the surface layer of the polished object removed by polishing is immediately sucked into the suction hood. Therefore, even when polishing a complex-shaped object, highly efficient polishing can be performed while sufficiently preventing dust from scattering to the surrounding area.

[Brief explanation of the drawing]

FIG. 1(a) is a front view of the polishing tool, and FIG. 1(b) is a side view of the polishing tool. FIG. 2 is a side view showing a polishing system using a polishing tool. FIG. 3 is a partially cutaway perspective view showing the suction hood. FIG. 4(a) is a cross-sectional view showing an example of the abrasive support structure of the polishing tool, FIG. 4(b) is a sectional view taken along line B-B, and FIG. 4(C) is a ring-shaped plate FIG. FIGS. 5A to 5C are diagrams for explaining tool access during polishing using a polishing tool. FIG. 6 is a diagram for explaining the movement of the abrasive material during polishing with the polishing tool. FIG. 7(a) is a sectional view showing an example of an abrasive material support structure of a polishing tool, and FIG. 7(b) is a sectional view taken along line BB. FIG. 8(a) is a sectional view showing an example of an abrasive material support structure of a polishing tool, and FIG. 8(b) is a sectional view taken along line BB. 2: Drive rotation shaft, 4: Motor. 16: Abrasive material, 62: Suction hood, 64: Opening, 66: Duct 1 68 Niji cylinder, 70: Piston rod. Figure 2 Figure 4 (G) Figure 4 (b) Figure 4 (Cn Figure 1 (CnB rI 'r, <bn Figure 8 (0)

Claims (10)

[Claims] (1) A cylindrical abrasive material rotated by a driving means, and a cylindrical abrasive material arranged so as to face the abrasive material at a position behind the position of contact with the object to be polished in relation to the direction of rotation of the abrasive material. and a suction hood that opens in a long and narrow manner along the rotational axis of the abrasive material in close proximity to the surface of the abrasive material.
polishing tools. (2) The polishing tool according to claim 1, comprising means for changing the length of the suction hood in a direction along the rotation axis of the polishing material. (3) The abrasive material is arranged in the same direction so as to surround the drive rotation shaft, and a plurality of leaf springs are arranged radially to directly or indirectly connect the inner surface of the abrasive material and the rotation shaft. 2. The polishing tool according to claim 1, wherein the leaf spring has a surface along the direction of the rotation axis and is curved. (4) The polishing tool according to claim 3, wherein the drive rotation shaft is provided with a means for directly or indirectly transmitting rotational force to the cylindrical polishing material in addition to the leaf spring. . (5) The abrasive material is arranged in the same direction so as to surround the drive rotation shaft, and a plurality of coil springs are arranged radially to directly or indirectly connect the inner surface of the abrasive material and the rotation shaft. The polishing tool according to claim 1. (6) A plurality of inner ring-shaped plates are attached to the outer surface of the drive rotating shaft perpendicularly to the shaft, and outer ring-shaped plates are attached perpendicularly to the axis on the inner surface of the abrasive material in correspondence with the inner ring-shaped plates. The polishing tool according to claim 5, wherein a plurality of plate bodies are attached, and each of these corresponding ring-shaped plate bodies is connected by a plurality of coil springs. (7) The polishing tool according to claim 5, wherein the drive rotation shaft is provided with a means for directly or indirectly transmitting rotational force to the cylindrical polishing material in addition to the coil spring. (8) Abrasive materials are arranged in the same direction so as to surround the drive rotation shaft, and an elastic body is directly or indirectly filled between the abrasive material and the rotation shaft, and the rotation shaft is filled with an elastic body. The polishing tool according to claim 1, further comprising means for directly or indirectly transmitting rotational force from the polishing material to the polishing material. (9) The polishing according to claim 8, wherein the rotating shaft and the elastic body and the elastic body and the abrasive material are joined, whereby rotational force is transmitted to the abrasive material. tool. (10) The polishing tool according to claim 8, wherein the drive rotation shaft is provided with means for directly or indirectly transmitting rotational force to the cylindrical polishing material in addition to the elastic body. .