JP7465122B2 - Laser surface protrusion removal device. - Google Patents

Description

The present invention relates to a laser surface protrusion removal device that can remove an object using a laser.

In recent years, ultra-high-strength fiber-reinforced concrete (hereinafter sometimes simply referred to as "UFC"), a lightweight, high-strength, and highly durable concrete material that contains steel fibers, has been used in a variety of structures. For example, Patent Document 1 proposes an example in which the above-mentioned UFC is used as a filler hardening material for the joints of precast concrete decks installed opposite each other.

Patent Publication 2019-002251

However, when applying sheet waterproofing to the top surface of UFC, including the UFC-based interfacial hardening material disclosed in Patent Document 1, there is a problem in that the steel fibers protruding from the surface of the UFC create holes in the sheet, making it impossible to ensure the necessary waterproofing performance.

One method of cutting out steel fibers protruding from the surface of UFC is to burn them off with a gas burner, but this method cannot be adopted because applying a gas burner directly to the concrete would cause deterioration of healthy concrete due to the high heat. Also, while it is possible to cut out the steel fibers one by one by hand, this is not a realistic method in terms of the effort and cost involved.

Therefore, the present invention aims to provide a laser removal traveling device that can remove the object to be removed using a laser.

The invention of claim 1 is a laser surface protrusion removal device comprising at least a cart with wheels attached, and a laser device mounted on the cart and capable of cutting out the object to be cut on a surface to be cut, wherein the cart travels along or near the surface to be cut, and the laser device comprises a final stage mirror device that is positioned at a predetermined height position from the surface to be cut, and irradiates the surface to be cut from the final stage mirror device with a laser to cut out the object to be cut.

According to the configuration of claim 1, by mounting a laser device (laser irradiation unit 40 including laser controller 30 and optical head 41) on a cart 11 that is equipped with wheels and can run, it is possible to irradiate the laser while running on the surface to be cut (e.g., UFC) or in its vicinity, and cut the object to be cut (e.g., steel fiber). This significantly reduces the effort required to cut the object to be cut manually, and makes it possible to reliably cut the object to be cut.

The invention according to claim 2 is the laser surface protrusion removal device according to claim 1, in which the carriage is equipped with a guide rail clamping device that clamps a guide rail installed on or near the surface to be resected.

According to the configuration of claim 2, the cart 11 is provided with a guide rail clamping device (side sliding guide member 12 and guide roller member 13) that clamps the guide rail 50 installed on or near the surface to be cut, making it possible to accurately cut off the material to be cut (e.g., steel fibers) on the surface to be cut (e.g., UFC), enabling efficient removal work.

The invention according to claim 3 is the apparatus for shaving a surface protrusion using a laser according to claim 1 or 2, wherein the final stage mirror device is pressed against the surface to be ablated by the biasing force of a coil spring.

According to the configuration of claim 3, the final stage mirror device 46, which can irradiate a laser with an optical axis approximately parallel to the surface to be ablated (e.g., UFC), is configured to be pressed against the surface to be ablated by the biasing force of the coil spring 451. This allows the final stage mirror device 46 to always be at an appropriate height position relative to the surface to be ablated without being affected by undulations in the surface to be ablated or undulations on the running surface of the dolly 11, making it possible to reliably ablate the object to be ablated.

The invention according to claim 4 is a laser surface protrusion removal device according to any one of claims 1 to 3, in which the laser device has an effective cutting irradiation distance of 260 mm on the surface to be cut, and the object to be cut is a steel fiber.

According to the configuration of claim 4, the effective cutting irradiation distance of the surface to be cut (e.g., UFC) is set to 260 mm, making it possible to cut the steel fibers that are the object to be cut. Therefore, even if the surface to be cut is wide, it is possible to cut the steel fibers efficiently with fewer passes.

1 is a front perspective view of an entire laser removal traveling device according to an embodiment of the present invention; FIG. 2 is an overall rear perspective view of the laser removal traveling device in the embodiment of the present invention. FIG. 2 is an enlarged perspective view of a laser irradiation unit in the embodiment of the present invention. FIG. 2 is an enlarged perspective view of a final stage mirror portion in the embodiment of the present invention. FIG. 4 is a perspective view of a side guide in the embodiment of the present invention. FIG. 2 is an explanatory diagram of a laser in an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a confirmation test mode in the present invention. 1 is a result table showing the results of a confirmation test in the present invention.

The following describes the laser surface protrusion removal device of the present invention based on an embodiment, with reference to the drawings.

Figure 1 shows an overall front perspective view of a laser removal traveling device 1 as an example of the present invention, and Figure 2 shows an overall rear perspective view. The laser removal traveling device 1 of this embodiment is designed to remove steel fibers protruding from the surface of ultra-high strength fiber reinforced concrete (hereinafter sometimes simply referred to as "UFC") using a laser on the surface of the UFC, based on the technical issues described above.

As shown in Figures 1 and 2, the laser removal traveling device 1 has a three-point support cart 11 with two 75 mm diameter wheels at the front and one at the rear in the direction of travel, and is configured to be able to travel on or near the surface to be removed. In this embodiment, a hook is attached to the cart 11, and it is configured to be pulled by a winch (not shown). The cart 11 is equipped with at least a laser irradiation unit 40 including a laser power supply 20, a laser controller 30, and an optical head 41.

Next, FIG. 3 shows an enlarged perspective view of the laser irradiation unit 40. On the upper side of the dolly 11, an optical head 41 is installed on a flat plate as shown in the figure, and at the tip of the laser output from the optical head 41, there are provided an elevation angle adjustment mechanism 43 that can adjust the elevation angle of the optical axis of the laser downstream of a final stage mirror 461 (described later), and an optical axis height adjustment mechanism 42 that can adjust the height of the optical axis, as shown in the figure.

The laser that has passed through the elevation angle adjustment mechanism 43 is configured to be incident on the final stage mirror device 46 via an optical path guide pipe 44 that extends in the vertical direction. As shown in FIG. 4, the final stage mirror device 46 is provided with a final stage mirror 461 and a final stage mirror height adjustment mechanism 462 that can adjust the height of the final stage mirror 461.

In addition, to protect the final stage mirror 461, it is surrounded on all four sides by a mirror protection member 464, and the area in the optical path of the laser is partially opened. Furthermore, as shown in FIG. 3, the upper surface of the mirror protection member 464 is covered by a cover member 463.

In addition, when the laser is emitted, if dust or the like is present on the optical path of the laser, it will have an adverse effect on each optical device, causing mirrors to burn or break. Therefore, in this embodiment, an optical path cover is installed to cover the laser optical path to prevent dust or the like from entering the laser optical path, and an air purge (not shown) is provided to supply clean air at a low pressure to the inside of the optical path cover. The optical path cover covers the optical path guide pipe 44 described above as well as the emission part of the optical head 41, the first stage mirror, and the final stage mirror 461, and clean air is supplied to its inside. The above-mentioned clean air is compressed air supplied from outside the laser removal traveling device 1, which is supplied to an air filter and regulator equipped on the dolly 11, and is adjusted to a clean and appropriate pressure before being supplied to the inside of the optical path cover.

To ensure that the object to be cut is cut by the laser, a cutting surface pressing member 45 is provided between the carriage 11 and the final stage mirror device 46 as shown in Figures 3 and 4. To explain in more detail, the cutting surface on which the object to be cut, such as steel fibers, exists, and the running surface on which the wheels of the carriage 11 run, are not necessarily flat. As a result, if the final stage mirror device 46 moves upward from the cutting surface, it will no longer be possible to cut the steel fibers, which are the object to be cut, from their roots by the laser.

In this embodiment, the bottom surface of the mirror protection member 464 is always pressed against the resection surface by the biasing force of the coil spring 451 provided in the resection surface pressing member 45, so that the final stage mirror device 46 is always at an appropriate height position without being affected by undulations in the surface to be resected or the running surface of the cart 11.

In addition, as shown in FIG. 5, two side sliding guide members 12 (located on the outside of the flange) and two guide roller members 13 are provided on the sides of the carriage 11 of the laser removal traveling device 1 in this embodiment, and the laser removal traveling device 1 is configured to travel while sandwiching the guide rail 50 (shown as the flange portion of the H-shaped steel) arranged along the traveling direction of the laser removal traveling device 1 between the side sliding guide members 12 and the guide roller members 13.

This configuration makes it possible to accurately cut the object to be cut from the surface to be cut, enabling efficient removal work. In this embodiment, the flange portion of the H-shaped steel is used as the guide rail 50, but this is not necessarily limited to this embodiment, and other members can be used instead.

The details of the laser in this embodiment are shown in Figure 6. The laser in this embodiment is a fiber laser, and a laser with an output of 100 W is output from the laser controller 30 equipped with a Q switch and the optical head 41. The focal length f of the lens is 1000 mm, and the beam diameter when entering the lens is 7 mm.

The diameter of the beam incident on the final stage mirror 461 is 2.8 mm, and the effective cutting irradiation distance of the laser (beam diameter 0.9 mm) that can cut the object to be cut is 260 mm. With this configuration, the object to be cut with a surface width of 200 mm in this embodiment can be cut by the laser.

The laser configuration of the laser removal traveling device 1 of the present invention described above makes it possible to set the resectable surface width to a very wide range of 260 mm, making it possible to efficiently remove objects such as steel fibers. Furthermore, in this embodiment, the laser output is set to 100 W, making it possible to handle it relatively easily and safely without the need for a cooling device or the like.

(Embodiment of Confirmatory Test)
7 shows a schematic diagram of a test device for the purpose of ensuring a wider surface width of the object to be removed and reliably removing the object to be removed when manufacturing the traveling laser removal device 1 of the present invention. The test device is composed of a fiber laser device with an output of 100 W equipped with a Q switch, a DC 24 V power supply, a simple controller, an XY stage controller, etc. Then, a test piece made by UFC is placed on the XY stage, and while the test piece is moved at a speed of 2 mm per second, the steel fibers protruding from the side of the UFC (shown as "test piece side") are removed by a laser.

In this confirmation test, the distance B from the 45-degree reflector to the focal position was fixed at 260 mm, and the distance A+B was tested at two levels: approximately 950 mm and approximately 1450 mm. Furthermore, the laser tilt was tested by varying the distances D and E at "Tilt 1" and "Tilt 2" as shown in the figure.

Figure 8 shows the results of the test conducted under the test conditions described above. In the confirmation test, a vinyl sheet was pressed against the side of the test specimen from which the steel fibers had been removed, and a pinhole test was conducted to check for holes in the sheet caused by the remaining steel fibers. As can be seen from the results in Figure 8, no pinholes were found on the sheet in the pinhole test for test specimen numbers "No. 6," "No. 7," and "No. 8," and the appearance of the side of the test specimen was also in good condition.

(Modification)
Although one embodiment of the laser removal traveling device of the present invention has been described above, the present invention is not necessarily limited to the above-mentioned configuration, and various modifications such as those described below are possible.

For example, in the above-mentioned embodiment, the laser removal traveling device 1 is configured to be pulled by a winch, but it is also possible to mount an electric motor that drives the wheels on the cart 11, and by making the laser removal traveling device 1 self-propelled at a predetermined speed, it is possible to easily transport it to any location and remove the object to be removed.

In the above-mentioned embodiment, the laser removal traveling device 1 of the present invention was used to cut out steel fibers protruding from the surface of the UFC, but the laser removal traveling device 1 of the present invention is not necessarily limited to such objects to be cut, and can remove other protrusions and attachments from the surface of the object to be cut. Furthermore, the laser removal traveling device 1 of the present invention generates almost no noise or dust, so it can be used particularly effectively on indoor floors.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications that are equivalent in meaning to and within the scope of the claims. In addition, the specific materials, dimensions, shapes, etc. described in the above embodiments may be modified within the scope of the invention.

REFERENCE SIGNS LIST 1 laser removal traveling device 11 dolly 12 side sliding guide member 13 guide roller member 20 laser power source 30 laser controller 40 laser irradiation unit 41 optical head 42 optical axis height adjustment mechanism 43 elevation angle adjustment mechanism 44 optical path guide pipe 45 resection surface pressing member 451 coil spring 46 final stage mirror device 461 final stage mirror 462 final stage mirror height adjustment mechanism 463 cover member 464 mirror protection member 50 guide rail

Claims (4)

The present invention includes at least a carriage having wheels attached thereto, and a laser device mounted on the carriage and capable of ablating an ablation target on a surface to be ablated,
The cart travels on or near the surface to be ablated, and the laser device includes a final stage mirror device that is positioned at a predetermined height from the surface to be ablated, and irradiates the surface to be ablated from the final stage mirror device with a laser to ablate the object to be ablated. 2. The laser surface protrusion shaving device according to claim 1, wherein the carriage includes a guide rail clamping device for clamping a guide rail disposed on or near the surface to be resected. 3. The apparatus for shaving a surface protrusion using a laser according to claim 1, wherein the final stage mirror device is pressed against the surface to be ablated by a biasing force of a coil spring. The laser device has an effective cutting irradiation distance of 260 mm on the surface to be cut,
4. An apparatus for shaving surface protrusions using a laser according to claim 1, wherein the object to be cut is a steel fiber.

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