JP2012179696A - Nozzle for blasting device, and surface treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle for a blasting device, which can uniform the surface roughness of a repairing part even when the repairing part is located in a place where the workability is bad, and to provide a surface treatment method.SOLUTION: The blasting device nozzle (blasting nozzle 120) is configured to be mounted to a tip (holder 110) of a blasting device 100 for jetting a grinding material with compressed air to treat a surface of a workpiece (steel stock 208). The blasting device nozzle includes: an elongated hose 122 formed of a rubber-based material; and a supporting member 124 that is disposed or wound along a longitudinal direction of the hose, freely bendable and can retain a bent shape thereof.

Description

  The present invention relates to a nozzle for a blasting device that is attached to the tip of a blasting device that jets an abrasive with compressed air to treat the surface of an object to be processed, and a surface treatment method using the same.

  A blasting device is a device that performs a surface treatment by causing a grinding material (sometimes referred to as a projection material or an abrasive) to collide with an object to be treated (hereinafter referred to as a workpiece). Blast projection methods are roughly classified into mechanical type, pneumatic type and wet type. The pneumatic type includes a vacuum type that carries abrasives by negative pressure and a direct pressure type that carries abrasives by positive pressure. For example, Patent Document 1 describes a configuration in which a blast hose is connected to a tank that contains an abrasive, and the abrasive that is pumped by compressed air is sprayed together with compressed air from an injection nozzle connected to the tip of the blast hose. Has been.

  The purpose of blasting includes removal of burrs from the workpiece, grinding and polishing of the surface, finishing, finishing and imparting work hardening. The particle size of the abrasive and the projection speed are selected according to the purpose. One of the purposes of such blasting is keren (rust removal).

  Keren is used when repairing rusted steel. If it explains in order, when rust has arisen in steel materials, after removing rust, a base agent (rust preventive agent) and a paint will be painted. There are stages depending on the degree of treatment, 1 type of keren to be ground until a glossy surface appears, 2 types of kelen to remove all rust, 3 types of kelen to remove rust with hand tools, 4 types to remove severe rust It is classified as Keren. The type 2 and type 3 use a power tool such as a wire brush, but the type 1 keren is supposed to be performed by blasting. That is, blasting is used as the highest degree of keren.

  Blasting is roughly divided into shot blasting and grid blasting, and shot blasting is used for coating ground processing and satin finishing using spherical abrasives (iron balls, metal balls, glass, walnuts, resins, etc.). Yes. Grid blasting is used for grounding treatment for thermal spraying and rust removal treatment for repair using sharp abrasives (iron, cut wire, molten alumina, garnet, Venus sand, etc.).

  Among grid blasts, metal grid blasts are mainly used for indoor factories because the scattered abrasive rusts with iron, and non-metal grid blasts are often used for blasting repairs outdoors. Since the blasting of the workpiece is large, the grid blast is used as a thermal spraying treatment. The roughened surface is called an anchor pattern. For example, Patent Document 2 describes that after the surface of a ceramic pan is roughened by sandblasting, a metal layer is formed by arc spraying.

  In addition, after removing rust with keren, it is common to apply a base agent (rust inhibitor) and a paint. However, Patent Document 3 also proposes repairing by spraying metal (zinc-aluminum alloy). In this case, the blast will have both the role of keren and roughening.

JP 2004-276137 A JP 2010-240324 A JP 2009-113066 A

  By the way, the electricity generated at the power station of the electric power company is transmitted over a long distance through a transmission line stretched over a steel tower built on the ground, and is supplied to consumers after being transformed at the substation. Although the steel tower that stretches the transmission line is subjected to anticorrosion treatment on the surface of the steel material by painting during construction, rust occurs when the anticorrosion effect decreases due to the influence of corrosive factors such as salt damage over time, Repair is required.

  In addition, various types of steel (including iron) equipment such as pole transformers and switches are attached to the utility pole managed by the electric utility. Such devices are similarly rusted and require repair. In particular, in oil-filled equipment in which insulating oil is sealed, rust repair is one of the important issues because if oil is leaked due to corrosion, the oil leaks and loses insulation.

  Even in such a case, it is ideal to perform one kind of kelen by blasting and further perform metal spraying. However, blasting and metal spraying are difficult to apply in repairing these steel towers and steel equipment.

  The reason for this is that when spraying after blasting, the inventors' research clearly shows that the surface condition of the object after treatment with blasting equipment (after rust removal) greatly affects the repair effect. became. That is, if the surface of the object to be processed after processing by a blasting device or the like is made uniform with a predetermined roughness (a predetermined anchor pattern is formed), the anticorrosion coating film and the coating to be applied after such processing are performed. It was found that the adhesion with the surface of the treated body was improved and a high repair effect was obtained.

  In order to make the surface of the object to be processed uniform, it is necessary to perform processing in a state where the tip of the spray nozzle of the blasting device is positioned substantially perpendicular to the surface. When the spray nozzle is inclined with respect to the surface of the object to be processed, the portion near the spray nozzle becomes too rough, the portion far from the spray nozzle becomes insufficiently rough, and the roughness in the processing range is significantly uneven. Because it occurs. Moreover, since the groove | channel (groove) gotten by the abrasives will become linear when sprayed from diagonally, there also exists a problem that the adhesive strength of a thermal spray coating falls. That is, in the blasting process for repair, it is not only necessary to remove rust, but it is also necessary to form an appropriate anchor pattern by spraying substantially vertically.

  Here, if the member can be removed and blasting can be performed in a flat place, it can be injected perpendicularly to the surface of the member without any trouble. However, in reality, it is necessary to process the equipment installed in the field. Since repairs such as steel towers and pole equipment are work at high places, the scaffolding is extremely limited. In addition, there are various beams, pillars, armatures, etc. around the towers and equipment on the pillars, so the repaired part is a narrow place or a place where work is bad such as a place away from the worker's standing position. Sometimes it is. In addition, it may be difficult to repair rust on a manhole inner surface where the worker cannot enter or where the worker cannot reach or where the width of the wall is narrow.

  In the situation as described above, in the blasting apparatus including the injection nozzle as in Patent Document 1, the tip of the nozzle is directed to the surface of the object to be processed while the tip of the blast hose is gripped by hand. The blast hose is thick and hard even though it bends. Therefore, in a narrow area where the hand that holds the blast hose cannot be inserted, the spray nozzle is placed against the surface of the repair area (target object). It is difficult to point the tip substantially vertically.

  In addition, when the repaired part is located away from the worker's standing position, the blasting apparatus having the spray nozzle of Patent Document 1 allows the worker to extend the hand holding the blast hose as much as possible to set the spray nozzle. It must be applied to the repair point. Then, since the posture of the worker becomes unstable, the distance between the surface of the object to be processed and the tip of the spray nozzle cannot be kept constant, and it becomes difficult to make the surface roughness uniform.

  Japanese Patent Laid-Open No. 2005-007552 proposes a nozzle capable of injecting an abrasive in a predetermined angle (substantially right angle) direction with respect to the blast hose. However, although the injectable range is slightly increased, since the angle is fixed, blast processing is not possible for all locations.

  In view of such problems, the present invention provides a nozzle for a blasting apparatus and a surface treatment method capable of making the surface roughness uniform even when the repaired part is in a place with poor workability. The purpose is that.

  In order to solve the above-mentioned problems, a typical structure of a nozzle for a blasting apparatus according to the present invention is a blasting apparatus that is attached to the tip of a blasting apparatus that injects an abrasive with compressed air to treat the surface of a workpiece Nozzle for a long hose part made of rubber-based material and arranged or wound along the longitudinal direction of the hose part so that it can be bent freely and keep the bent shape And a support member that can be used.

  According to the above configuration, since it has a thin hose part, it can be easily inserted even in a narrow place, and since the hose part is long, even if it is a place away from the standing position of the worker The tip of the nozzle can be placed at the repair location without the operator reaching out or breaking his posture. When the tip of the nozzle is bent so as to be perpendicular to the surface of the repaired part (object to be processed), the support member also bends along that, and the bent shape is maintained. Thereby, even if the hose part, that is, the nozzle is long, the state where the tip of the nozzle is perpendicular to the surface of the repaired portion is stably maintained. Therefore, even when the repair location is in a place where workability is poor, the surface roughness can be made uniform (a predetermined anchor pattern is reliably formed).

  It is good to further provide the earth line arranged or wound along the longitudinal direction of said hose part. Thereby, even if static electricity is generated in the hose portion, it is possible to discharge through the ground wire. As a result, it is possible to avoid the possibility of the operator being shocked by static electricity.

  In order to solve the above-mentioned problems, a typical configuration of the surface treatment method according to the present invention includes a long hose portion made of a rubber-based material, and is arranged or wound along the longitudinal direction of the hose portion, so that it can freely An anchor pattern is formed using a blasting device having a nozzle that can be bent and can hold a bent shape, and metal is sprayed on the anchor pattern And

  As described above, by using a blasting apparatus including the nozzle according to the present invention, it is possible to make the surface roughness of the object to be processed uniform and to form a predetermined anchor pattern. Thereby, if a film is formed by metal spraying on the surface of the object on which the anchor pattern is formed, high adhesion strength between the surface and the film can be obtained, and the repair effect can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a repair location is a place with bad workability | operativity, the nozzle for blasting apparatuses and the surface treatment method which can make the surface roughness uniform reliably can be provided. .

It is a figure explaining the whole structure of a blasting apparatus. It is a figure explaining the detail of a blast nozzle. It is the schematic which shows the work site which applies the surface treatment method concerning this embodiment. It is the schematic which shows the work site which applies the surface treatment method concerning this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Blasting device 100)
FIG. 1 is a diagram illustrating the overall configuration of the blasting apparatus. A blasting apparatus 100 shown in Fig. 1 injects a grinding material (not shown) with compressed air to treat the surface of an object to be processed (a steel material 208 (see Fig. 3) described later). , Mainly composed of a compressor 102, a main body 106, a holder 110 which is a distal end part to be described in detail later, a blast device nozzle according to the present embodiment (hereinafter referred to as blast nozzle 120), and a hose connecting them. .

  The compressor 102 generates compressed air by compressing air. The compressor 102 is connected to the main body 106 by an air hose 104, and the generated compressed air is pumped to the main body 106 through the air hose 104. The main body 106 is a so-called tank that accommodates an abrasive. The main body 106 is connected to the holder 110 by a blast hose 108, and the abrasive mixed with the compressed air from the air hose 104 is supplied to the holder 110 through the blast hose 108. In addition, as a grinding material, a metal type material, a ceramic type material, etc. can be used suitably.

  The holder 110 is a member that connects the blast hose 108 and the blast nozzle 120, and also functions as a grip portion. A throttle mechanism represented by a venturi tube or an orifice may be provided inside the holder 110. Thereby, the injection speed of the compressed air mixed with the abrasive from the blast hose 108 can be increased.

(Blast nozzle 120)
2 is a diagram for explaining the details of the blast nozzle 120, FIG. 2 (a) is an enlarged view of the blast nozzle 120 of FIG. 1, and FIG. 2 (b) is an exploded view of FIG. 2 (a). 2 (c) and 2 (d) are diagrams showing a state in which the blast nozzle 120 shown in FIG. 2 (a) is bent. As shown in FIG. 2 (a), the blast nozzle 120 according to the present embodiment is attached to the holder 110 of the blasting device, and these can be disassembled as shown in FIGS. 2 (b) and 2 (d). It is.

  The blast nozzle 120 includes a hose portion 122, a support member 124, a ground wire 126, and a coating layer 128. FIG. 2 shows only the outer diameter of the coating layer 128 and is a view seen through the inside. These members are screwed to the base 130, and are configured to be detachable from the holder 110 by a screw portion 130 a provided on the base 130.

  The hose part 122 is constituted by a long member made of a rubber-based material having flexibility. By having such a thin hose portion 122, the blast nozzle 120 can be easily inserted in a narrow place. In addition, since the hose portion 122 is long, the tip of the blast nozzle 120 can be disposed at a repaired place away from the standing position without the operator reaching out or breaking his posture. The workability can be improved.

  A support member 124 is disposed along the longitudinal direction of the hose portion 122. The support member 124 is a metal wire that can be bent by human power. For example, a soft iron wire can be used. Accordingly, when the hose portion 122 is bent as shown in FIG. 2C, the support member 124 is bent along the bend, and the bent shapes of the hose portion 122 and the support member 124 are maintained. Accordingly, when the tip of the blast nozzle 120 is bent so as to be perpendicular to the surface of the repaired portion (object to be processed), the bent shape is maintained, so that the hose portion 122, that is, the blast nozzle 120 is long. Even if it exists, the tip position does not become unstable.

  Moreover, in this embodiment, the earth wire 126 is wound around the hose part 122 along the longitudinal direction. The ground wire 126 is connected to a ground wire (not shown) incorporated in the blast hose 108. As a result, even if static electricity is generated in the hose portion 122, it is possible to discharge through the ground wire 126, and an electric shock of the operator can be prevented.

  In the present embodiment, a plurality of support members 124 are arranged around the hose portion 122 along the longitudinal direction. However, the present invention is not limited to this, and the support member 124 is arranged around the hose portion 122. It is good also as a structure wound around. Similarly, the ground wire 126 may be configured not to be wound around the hose portion 122 but to be arranged around the hose portion 122 along the longitudinal direction thereof.

(Surface treatment method)
Next, a surface treatment method using the blast apparatus 100 including the blast nozzle 120 according to the present embodiment will be described. 3 and 4 are schematic views showing a work site to which the surface treatment method according to the present embodiment is applied. In the work site 200 shown in FIG. 3, a scaffold 204 is installed around a steel material 202 that is a structural member in the height direction of a steel tower (the whole image is not shown). In the scaffold 204, the worker 206 performs surface treatment of the steel material 208 that is joined to the steel material 202 and serves as a horizontal component of the steel tower. That is, the object to be processed exemplified in this embodiment is a steel material 208.

  In the surface treatment method of the present embodiment, first, the rust 208a generated on the surface of the steel material 208 is removed using the blasting device 100 described above, and the roughness (surface roughness) of the surface is made uniform to obtain a predetermined anchor. Form a pattern. As described above, the blasting apparatus 100 includes the blast nozzle 120 (strictly, the hose portion 122) made of a long member. For this reason, as shown in FIG. 3, even if it is a work location (repair location) away from the standing position of the worker 206, the tip can be easily reached at the work location. In addition, since the support member 124 is disposed on the hose portion 122, the state where the blast nozzle 120 is bent is maintained, so that the tip of the blast nozzle 120 is perpendicular to the surface of the work site of the steel material 208. Is kept stable. Therefore, the surface roughness can be suitably uniformed and a predetermined anchor pattern can be reliably formed.

  As described above, when the rust 208a generated in the steel material 208 is removed using the blasting apparatus 100 and an anchor pattern is formed on the surface of the steel material 208 at the same time, metal is sprayed on the anchor pattern. Thereby, a film is formed by metal spraying on the surface of the steel material 208 on which the anchor pattern is formed. The metal is a metal having a greater ionization tendency than steel, and zinc or a zinc alloy is generally used. Since the anchor pattern is formed, a high adhesion strength between the surface and the film can be obtained, so that a high repair effect can be obtained.

  In addition, according to the blasting apparatus 100 including the blast nozzle 120 according to the present embodiment, the work can be easily performed even in a narrow work site 250 as shown in FIG. That is, for example, when a plurality of ground-mounted transformers 250a and 250b are installed adjacent to each other as in the work site 250 and it is desired to remove rust on the rust 252a of the surface 252 located in a narrow gap between them. Even in such a case, the blasting apparatus 100 can easily insert the blast nozzle 120 and work in a state perpendicular to the surface 252, so that excellent workability can be obtained.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used as a blasting device nozzle that is attached to the tip of a blasting device that treats the surface of an object to be processed by spraying an abrasive with compressed air, and a surface treatment method using the blasting device nozzle.

DESCRIPTION OF SYMBOLS 100 ... Blast apparatus, 102 ... Compressor, 104 ... Air hose, 106 ... Main body, 108 ... Blast hose, 110 ... Holder, 120 ... Blast nozzle, 122 ... Hose part, 124 ... Support member, 126 ... Ground wire, 128 ... Cover Layer: 130 ... Base, 130a ... Screw part, 200 ... Work site, 202 ... Steel, 204 ... Scaffold, 206 ... Worker, 208 ... Steel, 208a ... Rust

Claims (3)

A nozzle for a blasting device that is attached to the tip of a blasting device that jets abrasives with compressed air to treat the surface of the object to be treated,
A long hose part made of rubber-based material;
A support member that is arranged or wound along the longitudinal direction of the hose portion, can be freely bent, and can hold the bent shape;
A nozzle for a blasting apparatus, comprising:   The blasting device nozzle according to claim 1, further comprising a ground wire disposed or wound along a longitudinal direction of the hose portion. A long hose portion made of a rubber-based material, and a support member that is arranged or wound along the longitudinal direction of the hose portion, can be bent freely, and can hold the bent shape Forming an anchor pattern using a blasting device having a nozzle having
A surface treatment method comprising spraying metal onto the anchor pattern.

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