Surface treatment device and surface treatment method

Abstract

To efficiently and uniformly perform a surface treatment on a treatment target surface having corners or the like caused by projections or steps.SOLUTION: A surface treatment device that sprays a spray object toward a treatment target surface comprises a spray nozzle that sprays the spray object, a recovery hose that collects the sprayed spray object, and a casing on which the spray nozzle and the recovery hose are mounted. The casing includes a cylindrical body having one end opening that faces the treatment target surface, and a nozzle mounting portion which is provided on a side of the cylindrical body and on which the spray nozzle can be mounted in an orientation directed toward the one end opening of the cylindrical body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a surface treatment apparatus and a surface treatment method for spraying a substance onto a surface of a member. [Background technology]

[0002] For example, when painting the walls of a structure, grinding work is carried out to remove foreign matter from the wall surface. There are various methods for grinding work, but generally, a blasting machine is used to grind the surface to be treated.

[0003] As disclosed in Patent Document 1, the blasting machine is equipped with a cup-shaped case whose opening is pressed against the surface to be treated, a nozzle that sprays abrasive material inside the case toward the surface to be treated, and a suction hose that sucks up the sprayed abrasive material and dust generated by the impact of the abrasive material on the surface to be treated. The grinding work of the surface to be treated is carried out by moving the case while pressing it against the surface to be treated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-172295 Summary of the Invention [Problem to be solved by the invention]

[0005] The blasting machine described in Patent Document 1 is designed to collide abrasive material with the surface to be treated in a direction approximately perpendicular to the surface, so it is effective when the surface to be treated is relatively smooth. However, if the surface to be treated has protrusions or the like, it may not be possible to grind the sides and fine details with precision.

[0006] For example, in bridge repainting work, the surface to be treated may include steel joints in the bridge's main girders, counter beams, etc. Steel joints are generally constructed by placing a pair of splice plates across adjacent steel members, sandwiching them between them, and then bolting them together with the steel members.

[0007] As a result, protrusions caused by bolts and nuts and corners formed at the step between the splice plate and the steel material are formed on the surface of the steel joint. Simply striking the abrasive material toward the surface of such a steel joint in a direction approximately perpendicular to the surface will not be able to accurately grind the sides and corners of the protrusions. Therefore, the grinding operation must be repeated many times, with the case of the blasting machine rotated in various directions, in order to strike the abrasive material against the surface of the steel joint from the side or oblique direction.

[0008] The task of changing the casing of the blasting device in various directions can be difficult if the surface to be treated is in a narrow area, and a blasting device with a case cannot handle the task of striking abrasive material from the side against protrusions, etc. Therefore, an open blasting task is performed as a separate task, in which abrasive material is struck against the surface to be treated without using a casing. However, this increases the number of work steps and requires the task of collecting dust and other particles generated by striking the abrasive material against the surface to be treated, making the task more complicated.

[0009] The present invention has been made in consideration of such problems, and its main purpose is to efficiently and uniformly treat the surface of a treatment target surface that has corners caused by protrusions or steps. [Means for solving the problem]

[0010] In order to achieve this object, the surface treatment device of the present invention is a surface treatment device that sprays a spray material toward a surface to be treated, and includes an injection nozzle that sprays the spray material, a recovery hose that recovers the sprayed material, and a casing to which the injection nozzle and the recovery hose are attached, wherein the casing is characterized by comprising a cylindrical body with one end opening facing the surface to be treated, and a nozzle attachment part provided on the side of the cylindrical body, which can be attached in a position where the injection nozzle is directed toward one end opening of the cylindrical body.

[0011] The surface treatment device of the present invention is characterized in that the recovery hose is connected to the other end opening of the cylindrical body so as to be rotatable about its axis.

[0012] The surface treatment device of the present invention is characterized in that the cylindrical body is formed in a cylindrical shape, and the nozzle mounting portion is formed in a frustum shape.

[0013] The surface treatment method of the present invention is a surface treatment method using the surface treatment device of the present invention, characterized in that the one end opening of the cylindrical body is placed facing the surface to be treated, the casing is placed on the surface to be treated, and the injection material is injected.

[0014] The surface treatment method of the present invention is characterized in that a protrusion located on the surface to be treated is placed within the one end opening, and the injection material is injected while the cylindrical body is rotated around its axis.

[0015] The surface treatment method of the present invention is characterized in that the jet is an abrasive.

[0016] According to the surface treatment device of the present invention, a nozzle mounting portion is provided on the side of the casing, to which a spray nozzle can be attached in an orientation facing one end opening that faces the surface to be treated. This allows the spray nozzle to spray material from the spray nozzle diagonally toward the surface to be treated from above. Therefore, if the surface to be treated has a step or the like, the spray material can be efficiently impinged on the corner of the step.

[0017] Furthermore, if there are protrusions on the surface to be treated, the protrusions are positioned within the cylindrical casing and the injection material is then injected. The injection material, injected from diagonally above, will not only hit the top of the protrusions but also a wide area in the vertical direction. Therefore, if the injection material is injected while rotating the cylindrical body around its axis, the injection material can be uniformly injected onto the entire outer surface of the protrusions.

[0018] In this way, the sprayed material can be uniformly impinged on the surface to be treated regardless of the state the surface is in, ensuring high quality in the finished surface treatment. Furthermore, because the recovery hose is connected to the other end opening of the cylindrical body, dust generated near one end opening, such as the sprayed material that has impinged on the surface to be treated and the removed foreign matter, can be efficiently recovered.

[0019] Therefore, if this method is used in blasting to grind steel joints during surface preparation such as repainting work, even if the surface to be treated has protruding parts such as bolts and nuts or corners caused by steps with splice plates, it will be possible to eliminate the process of repeatedly changing the position of the casing or performing open blasting work, thereby contributing to improved workability and shorter construction times. [Effects of the Invention]

[0020] According to the present invention, the spray material can be directed at the surface to be treated from an obliquely upward direction, making it possible to treat the surface to be treated efficiently and uniformly even if the surface to be treated has corners caused by protrusions or steps. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing a surface treatment device of the present invention; [Figure 2] 1 is a diagram showing a surface treatment method (in the case where protrusions are included) using the surface treatment device of the present invention. [Figure 3] 1 is a diagram showing a surface treatment method (including corners) using the surface treatment device of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention involves spraying a jet of material obliquely from above onto a surface to be treated to perform surface treatment. The position and shape of the surface to be treated, the type of jet of material, etc. are not limited in any way. In this embodiment, an example is taken of a case where a blast treatment is performed on a surface to be treated, including a steel joint, in a base treatment such as a repainting work, and details of the surface treatment device and the surface treatment method will be described with reference to Figs. 1 to 3.

[0023] <<Surface Treatment Equipment>> As shown in FIGS. 1(a) and 1(b), the surface treatment device 100 includes a blast hose 10, a casing 20, and a recovery hose 30.

[0024] 2(a), the blast hose 10 supplies the abrasive M transported together with compressed air to an injection nozzle 11 attached to one end thereof, and the tip of the injection nozzle 11 is inserted into a casing 20. The other end of the blast hose 10 is connected to a pressurized tank (not shown) in which the abrasive M is stored.

[0025] 1(a) and 1(b), the casing 20 comprises a tubular body 21 and a nozzle mounting portion 22. The tubular body 21 is formed in a cylindrical shape, and a sealing material 23 that seals the gap between the tubular body 21 and the surface to be treated F is provided at one end opening 211 that faces the surface to be treated F. The sealing material 23 is, for example, a brush, and prevents leakage of the abrasive material M that is sprayed from the spray nozzle 11 and hits the surface to be treated F, as well as dust D such as foreign matter peeled off and removed from the surface to be treated F by the abrasive material M, as shown in FIG. 2(a).

[0026] A recovery hose 30 for recovering the abrasive material M and dust D is rotatably connected to the other end opening 212 side of the cylindrical body 21. The recovery hose 30 will be described later. A nozzle mounting part 22 for installing the above-mentioned injection nozzle 11 is provided on the side surface of the cylindrical body 21.

[0027] The nozzle mounting part 22 is formed in a truncated cone shape, and the injection nozzle 11 is connected to a small-diameter end opening 221. As shown in Fig. 2(a), the large-diameter end opening 222 is connected to the side of the cylindrical body 21 in a state of communication with the inner space. As shown in Fig. 1(a), such a nozzle mounting part 22 is connected so that its axis intersects with the axis of the cylindrical body 21 and faces one end opening 211 of the cylindrical body 21.

[0028] 2(b), the injection nozzle 11 is oriented so as to face the opening 211 at one end of the cylindrical body 21. The height of the nozzle attachment part 22 and the angle at which the axis of the nozzle attachment part 22 intersects with the axis of the cylindrical body 21 may be set at any value as long as the abrasive M can be caused to collide with the surface F to be treated located within the opening 211 at one end of the cylindrical body 21.

[0029] 2(a), one end of the recovery hose 30 is connected to the other end opening 212 of the casing 20 via a rotation mechanism 40, and the other end is connected to a dust collector (not shown). In this way, when one end of the recovery hose 30 is connected to the other end opening 212 opposite the one end opening 211 of the cylindrical body 21 and the dust collector is operated, it is possible to efficiently suck in and collect the abrasive M that has collided with the surface F to be treated, dust D containing foreign matter that has been peeled off and removed from the surface F to be treated, and the like.

[0030] Rotation mechanism 40 is a connecting member equipped with, for example, bearings, and connects recovery hose 30 to cylindrical body 21 so that it can rotate freely about its axis. Here, as shown in FIG. 1(b), the axis of recovery hose 30 is aligned on the same line as the axis of cylindrical body 21. Therefore, even if cylindrical body 21 is rotated or swung about its axis on surface F to be treated, recovery hose 30 does not impede its movement.

[0031] As described above, the surface treatment apparatus 100 has the nozzle mounting portion 22 provided on the side of the cylindrical body 21 that constitutes the casing 20, and the injection nozzle 11 is mounted in an orientation that faces one end opening 211 that faces the surface to be treated F. This allows the injection nozzle 11 to inject the abrasive material M from an obliquely upward direction toward the surface to be treated F. Therefore, regardless of the state of the surface to be treated F, such as the presence of unevenness or steps, the abrasive material M can be efficiently caused to collide with the surface to be treated F, ensuring a uniform finish across the entire surface to be treated F.

[0032] <<Surface treatment method using surface treatment device>> The surface treatment device 100 described above is suitable for cases where the treatment target surface F set on the steel material includes a steel material joint.

[0033] Below, we will explain the procedures for surface treating the protrusions S of bolts and nuts, etc., provided at steel joints, as shown in Figures 2(a) and (b), and the surface treating the corners C that occur at the steps formed by stacking splice plates P, as shown in Figures 3(a) and (b).

[0034] <When protrusion S exists> 2(a), the protrusions S are housed inside the cylindrical body 21 constituting the casing 20, and the sealing material 23 of the cylindrical body 21 is pressed against the surface F to be treated. In this state, the abrasive material M is sprayed from the spray nozzle 11 of the surface treatment device 100, and the dust collector is operated.

[0035] Then, in the hollow portion of the cylindrical body 21, the abrasive material M sprayed from diagonally above toward the surface F to be treated and the protrusions S collides not only with the upper surfaces of the protrusions S, but also with a wide range in the height direction of the side surfaces of the protrusions S that face the nozzle mounting parts 22. However, there is a possibility that the abrasive material M will not sufficiently collide with the side surfaces of the protrusions S that do not face the nozzle mounting parts 22.

[0036] 2(b), the casing 20 is rotated or swung around the axis of the cylindrical body 21 above the surface F to be treated. This makes it possible to easily change the direction in which the abrasive M is sprayed against the protrusions S, and to cause the abrasive M to collide evenly with the entire outer surface of the protrusions S. This makes it possible to significantly reduce the work time for the blasting process, while ensuring high quality in the finish of the entire protrusions S after surface treatment.

[0037] Furthermore, the casing 20 can be operated with the axial direction of the cylindrical body 21 always positioned parallel to the protruding direction of the protrusions S. Therefore, as shown in Figures 2(a) and 2(b), even in a narrow environment where the protrusions S are provided close to each other, the abrasive material M can be sprayed toward the side of the protrusions S and collided with them.

[0038] <When corner C exists> 3(a), the corner C is housed inside the cylindrical body 21 constituting the casing 20, and the sealing material 23 of the cylindrical body 21 is pressed against the surface F to be treated. In this state, the abrasive material M is sprayed from the spray nozzle 11 of the surface treatment device 100, and the dust collector is operated.

[0039] Then, in the hollow portion of the cylindrical body 21, the abrasive material M can be sprayed from the spray nozzle 11 toward small areas such as the side surface and protruding corner of the splice plate P that form the corner C, and even toward the recessed corner between the surface to be treated F and the splice plate P. Therefore, by moving the casing 20 along the longitudinal direction of the corner C, the abrasive material M can be uniformly collided with the entire corner C in the longitudinal direction.

[0040] Furthermore, when the corners C are arranged close to each other, the casing 20 is rotated or swung about the axis of the cylindrical body 21 above the surface F to be treated, as shown in Fig. 3(b). This allows blasting of both of the pair of opposing corners C in a single operation, thereby significantly improving work efficiency.

[0041] As described above, if the surface treatment device 100 is used for blasting steel joints, even when the surface F to be treated has protrusions S such as bolts and nuts or corners C caused by steps with splice plates P, it is possible to omit the process of repeatedly changing the position of the casing 20 or performing open blasting work in which abrasive M is collided with the surface F to be treated without using the casing 20. This improves the workability of the entire construction work and contributes to shortening the construction period.

[0042] The surface treatment device and surface treatment method of the present invention are not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0043] For example, in this embodiment, the case where the tubular body 21 of the casing 20 is formed in a cylindrical shape has been taken as an example. However, this is not limited to this, and any shape, such as a rectangular tube or a tube with a polygonal cross section, may be used. Furthermore, it may be formed in a truncated cone shape or the like as long as it has a hollow portion. Similarly, the shape of the nozzle mounting portion 22 is not limited in any way.

[0044] Furthermore, a handle or the like may be provided on the outer circumferential surface of the casing 20 so that an operator who handles the surface treatment device 100 can grip and operate it. [Explanation of symbols]

[0045] 100 Surface Treatment Equipment 10 Blast Hose 11 Injection nozzle 20 Casing 21 Cylinder 211 End opening (one side) 212 End opening (other side) 22 Nozzle mounting part 221 End opening (small diameter) 222 End opening (large diameter) 23 Sealing material 30 Recovery hose 40 Rotation mechanism M Abrasive (jet) D Dust F Processing surface S protrusion C Corner P attachment plate

Claims

1. A surface treatment device that sprays a spray material toward a surface to be treated, a spray nozzle for spraying a spray material; a recovery hose that recovers the injected material; a casing to which the injection nozzle and the recovery hose are attached, The casing comprises: a cylindrical body having an opening at one end thereof facing the surface to be treated; a nozzle mounting portion provided on a side of the cylindrical body, the nozzle mounting portion being capable of mounting the injection nozzle in a position facing the opening at one end of the cylindrical body.

2. The surface treatment device according to claim 1, The surface treatment device according to claim 1, wherein the recovery hose is connected to the other end opening of the cylindrical body so as to be rotatable about its axis.

3. The surface treatment device according to claim 1, 10. A surface treatment device, wherein the cylindrical body is formed in a cylindrical shape, and the nozzle mounting portion is formed in a frustum shape.

4. A surface treatment method using the surface treatment device according to any one of claims 1 to 3, the casing is placed on the surface to be treated with the one end opening of the cylindrical body facing the surface to be treated; A surface treatment method comprising spraying the spray material.

5. The surface treatment method according to claim 4, A surface treatment method characterized by placing a protrusion located on the surface to be treated within the one end opening, and spraying the spray material while rotating the cylindrical body around its axis.

6. The surface treatment method according to claim 4, A surface treatment method characterized in that the sprayed material is an abrasive material.

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