WO2023214448A1

WO2023214448A1 - Nozzle cleaner

Info

Publication number: WO2023214448A1
Application number: PCT/JP2022/019502
Authority: WO
Inventors: 博原
Original assignee: 博原
Priority date: 2022-05-02
Filing date: 2022-05-02
Publication date: 2023-11-09

Abstract

[Problem] The present invention provides a nozzle cleaner that can remove deposits inside a nozzle with a smaller force, and has good operability. [Solution] A nozzle cleaner 1 comprises a polishing part 2 that is inserted into a nozzle while being rotated, and a holding part 4 to which the polishing part 2 is fixed. The polishing part 2 is configured in a shape such that a plurality of polishing blades 20 formed of a quadrangular plate-like object having blade edges 1a, 1b are aligned at intervals in an axial direction Ax. The polishing blade 20a on the front end side in the axial direction Ax and the polishing blades 20b to 20d on the rear side are disposed at different angular positions as viewed in the axial direction. Because the polishing blades 20 are provided at intervals and the blade edges 1a, 1b are not continuous along the axial direction Ax, the nozzle cleaner 1 has a reduced load on the polishing part 2 and can be operated with a smaller force. The structure in which the polishing blades 20a and 20b are at different angular positions is advantageous in that by slightly rotating and pushing in the polishing part 2, the next blade edge hits the deposit at an attention point on the nozzle inner surface.

Description

nozzle cleaner

The present invention relates to a nozzle cleaner for removing deposits attached to the surface of a nozzle of a welding torch.

Conventionally, nozzle cleaners of various shapes are known, which are inserted into the nozzle of a welding torch that supplies shielding gas to the welding point and rotated to remove deposits attached to the inner surface of the nozzle (for example, (See Patent Documents 1 and 2). In the nozzle cleaner shown in Patent Document 1, the polishing part inserted into the nozzle has a shape in which a plane parallel to the cylinder is formed on the outer surface of a cylinder, and the line of intersection between the plane and the circular outer surface forms a plane parallel to the cylinder. The edge is used as a cutting edge for polishing.　

In the nozzle cleaner shown in Patent Document 2, the polishing part inserted into the nozzle is formed of a tapered quadrangular prism whose cross section becomes smaller toward the tip, and the edge of the quadrangular prism is used as a cutting edge for polishing.

Japanese Patent Application Publication No. 2017-148852 Japanese Patent Application Publication No. 2002-160062

However, in the nozzle cleaners as shown in Patent Document 1 and Patent Document 2 mentioned above, since a polishing cutting edge is provided over the entire length of the polishing part inserted into the nozzle, deposits existing along the cutting edge can be removed. When removing the nozzle cleaner, the load on the polishing section becomes large and a large amount of force is required to operate the nozzle cleaner, making it inconvenient to use.　

The present invention solves the above problems, and aims to provide a nozzle cleaner that can remove deposits inside a nozzle with a smaller force and has good operability.　

In order to achieve the above object, the nozzle cleaner of the present invention is a nozzle cleaner for removing deposits adhering to the surface of a nozzle of a welding torch, which is insertable into the nozzle and is axially oriented when inserted. a polishing part that extends and polishes the inner surface of the nozzle; a grip part to which the polishing part is fixed and has a diameter larger than that of the polishing part and is held by an operator; A plurality of polishing blades are provided side by side at intervals in the direction, and each of the polishing blades is formed of a polygonal plate-shaped body when viewed in the axial direction, and the edge of the plate-shaped body is a cutting edge. , is characterized by.　

According to the nozzle cleaner of the present invention, the abrasive blades having cutting edges are provided at intervals in the axial direction, and the cutting edges are not continuous in the axial direction, so the load on the abrasive part is suppressed and the It is easy to operate as it can remove deposits inside the nozzle with force.

FIG. 1 is a perspective view of a nozzle cleaner according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of the nozzle cleaner. (a) is a side view of the same nozzle cleaner, (b) is a front view of the same, (c) is a side view of the nozzle cleaner of (a) rotated by 45 degrees around its axis, and (d) is a front view of the same. figure. (a) is a partially sectional side view showing the nozzle cleaner inserted into the nozzle of a welding torch, and (b) is a view of the nozzle cleaner in (a) rotated by 45° around its axis. (a) is a perspective view of a nozzle cleaner according to a first modification, and (b) is a perspective view of a nozzle cleaner according to a second modification. FIG. 7 is a perspective view of a nozzle cleaner according to a third modification. FIG. 7 is a perspective view of a nozzle cleaner according to a fourth modification. FIG. 7 is a perspective view of a nozzle cleaner according to another embodiment. (a) is a perspective view of a nozzle cleaner according to a fifth modification, and (b) is a top view of the same.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A nozzle cleaner according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the nozzle cleaner 1 has an axial direction Ax that is the insertion direction when inserted into the nozzle. The nozzle cleaner 1 includes a polishing section 2 for polishing the inner surface of a nozzle, a base 3 integrally fixed to the polishing section 2, and a grip section 4 connected to the base 3.　

The polishing part 2 has a shape that can be inserted into a nozzle of a welding torch and extends in the axial direction Ax. The polishing section 2 includes a plurality of polishing blades 20 (general term for 20a, 20b, 20c, and 20d) arranged in a row in the axial direction Ax (four in this example). The polishing blade 20a (first polishing blade) is located on the tip side in the axial direction Ax, and the

polishing blades

20b, 20c, and 20d (collectively, second polishing blades) are located on the rear side of the polishing blade 20a. Each of the polishing blades 20 is formed of a polygonal (square in this example) plate-shaped body when viewed in the axial direction, and edges, which are sides and ridges, of each plate-shaped body are used as

cutting edges

1a and 1b. The polishing blades 20 are stacked in layers with spacings 21 between them to form a polishing section 2, and are fixed coaxially to a cylindrical base 3. The polishing section 2 has a cavity 23 extending in the axial direction Ax to avoid interference with a power supply tip, which is a structure inside the nozzle, when the polishing section 2 is inserted into the nozzle. The general shape of the polishing section 2 is a hollow rod having an uneven outer shape that is a combination of a square, a circle, and a slope.　

Each of the plurality of polishing blades 20 is a square with the same size when viewed in the axial direction. The polishing blade 20a at the most distal end of the polishing section 2 and the rear polishing blades 20b to 20d are rotated by 45 degrees around the axis so that they are at different angular positions when viewed in the axial direction.　

The polishing blade 20a on the tip side in the axial direction Ax has isosceles triangular chamfered portions 24 at the four corners of the tip side, and the oblique side forming the boundary of the chamfered portion 24 is inserted into the nozzle first. The cutting edge 1a is an advanced cutting edge. The oblique side means an oblique side (edge) that is neither parallel nor perpendicular to the axial direction Ax of the polishing section 2 . This polishing blade 20a has a cutting edge 1a consisting of an oblique side and a cutting edge 1b consisting of an edge extending in the axial direction Ax. The cutting edge 1b enters the nozzle from behind the cutting edge 1a.　

Each of the

rear polishing blades

20b, 20c, and 20d has a cutting edge 1b consisting of four edges along the axial direction Ax. These cutting edges 1b are succeeding cutting edges to the cutting edge 1a, which is an advanced cutting edge, and finish polishing the inner surface of the nozzle.　

The spacing portion 21 functions as a spacer having a cylindrical outer shape, and provides intervals between the polishing blades 20. The spacing part 21 is formed integrally with other constituent parts of the polishing part 2, for example, by cutting. The separating portion 21 is not limited to a perfect cylindrical shape, but may have an incomplete cylindrical shape, such as when turning a square prism, the machining is stopped before it becomes a perfect cylinder, leaving a square prism surface. It is sufficient if the cutting edges 1b between the polishing blades 20 can be separated.　

The base 3 has a cylindrical shape and has a female thread at the center of its lower surface. The base 3 has a cross section larger than the outer shape of the polishing blade 20 when viewed in the axial direction, and functions as a stopper with which the tip of the nozzle comes into contact with the upper surface of the base 3 when the polishing part 2 is inserted into the nozzle. The base portion 3 is not limited to a cylindrical shape, but may have any shape as long as it functions as a stopper for the nozzle, and the grip portion 4 may be used as a stopper for the nozzle. The base portion 3 is formed integrally with the polishing portion 2, for example, by cutting.　

The gripping part 4 has a disc shape with a larger diameter than the polishing part 2 and the base 3, has a recess 4a in the center of its upper surface into which the base 3 is inserted, and has a recess 4a in the center of its lower surface that is screwed to the female thread of the base 3. It has a hole for inserting a male screw 4b. The hole communicates with the recess 4a. The polishing part 2 is fixed to the grip part 4 via the base part 3 with a male screw 4b. In order to prevent the mutual rotation of the base 3 and the gripping part 4, which are integral with the polishing part 2, the bottom surface of the recess 4a and the bottom surface of the base 3 may be positioned by setting a pin at an eccentric position. For example, it is assumed that the operator presses the grip part 4 while turning the grip part 4 while placing the palm side on the rear end surface of the grip part 4 and placing the fingers distributed around the outer periphery of the grip part 4. ing.　

Next, the

cutting edges

1a and 1b will be further explained. As shown in FIGS. 3(a), (b), (c), and (d), the cutting edge 1b consisting of an edge along the axial direction Ax of the polishing blade 20 is coaxial with the nozzle cleaner 1 that includes the polishing blade 20. It is located on the virtual circle 20R. When the nozzle cleaner 1 is rotated around its axis, the cutting edge 1b moves on the virtual circle 20R. The virtual circle 20R is smaller than the inner diameter of the nozzle processed by the nozzle cleaner 1.　

The cutting edge 1a consisting of the oblique side of the chamfered portion 24 of the polishing blade 20a extends diagonally from a position near the center of the virtual circle 20R to the circumference of the virtual circle 20R when viewed from the side of the polishing portion 2. It is distributed in a tapered shape. Therefore, the polishing blade 20a can be easily inserted into the nozzle using the chamfered portion 24 and the cutting edge 1a as guides, and is convenient to use. When the polishing part 2 is inserted into the nozzle while being rotated, the cutting edge 1a penetrates into the nozzle while widening the inner diameter by scraping off the deposits that have accumulated on the inner surface of the nozzle and narrowing the inner diameter.　

Next, an example of how the nozzle cleaner 1 is used will be explained. As shown in FIGS. 4(a) and 4(b), the welding torch 9 for arc welding includes a nozzle 90 for supplying shielding gas to the welding point, and a welding torch 9 for supplying shielding gas to the welding point along the central axis of the welding torch 9. The welding wire is provided with a power supply tip 91 that contacts the wire and forcibly supplies electric energy to the welding wire.　

The operator holds the nozzle 90 with one hand and the grip part 4 of the nozzle cleaner 1 with the other hand, and pushes the polishing blade 20a into the nozzle 90 while turning the nozzle cleaner 1 clockwise or counterclockwise. At this time, the power supply tip 91 fits inside the cavity 23 without interfering with the nozzle cleaner 1, the cutting edge 1a advances while scraping off the deposits that have adhered to it, and the subsequent cutting edge 1b further removes the remaining deposits. Proceed by scraping and finishing polishing. In this manner, deposits attached to the inner surface of the nozzle 90 of the welding torch 9 can be removed and cleaned using the nozzle cleaner 1.　

The nozzle 90 described above can normally be removed from the welding torch 9. When cleaning the inside of the nozzle 90 removed from the welding torch 9 with the nozzle cleaner 1, the power supply tip 91 is not present in the nozzle 90, so the cavity 23 may not be formed in the polishing part 2.　

Next, manufacturing of the nozzle cleaner 1 will be explained. The nozzle cleaner 1 of this embodiment is composed of three parts: a polishing part 2 integrated with a base 3, a grip part 4, and a male screw 4b that connects and fixes these parts. The polishing part 2 may be made of any material that can form cutting

edges

1a and 1b that are strong and durable enough to remove attached deposits, and may be made of, for example, a metal material, such as an iron alloy.　

The polishing part 2 and the base part 3 have a circular surface coaxial with the axis, a plane parallel to the axis direction Ax, and a plane forming the chamfered part 24 and an inclined surface inclined with respect to the axis direction Ax. , and a plane perpendicular to the axial direction Ax as the outer shape forming surfaces. These surfaces can be easily machined, for example, by lathe processing and milling, and the nozzle cleaner 1 can be manufactured at low cost. Further, the

cutting edges

1a and 1b may be hardened by hardening after cutting.　

The gripping part 4 only needs to have enough strength to fix the polishing part 2 integrated with the base part 3. For example, it can be made of lightweight aluminum alloy and can be easily machined using a lathe. . The grip part 4 may be integrated with the polishing part 2 and the base part 3. Moreover, the grip part 4 is not limited to metal, and may be made of wood or plastic, and is not limited to a single material, but may be made of a composite of metal, wood, plastic, rubber, or the like.　

FIG. 5(a) shows a nozzle cleaner 1 according to a first modification. Here, the gripping part 4 is a cylindrical or rod-shaped gripping part 4. Such a gripping part 4 can be made of any material like the disc-shaped gripping part 4, and its structure may be in the shape of a pipe. This nozzle cleaner 1 can perform nozzle cleaning work by, for example, holding the gripping part 4 with one hand, like holding a horizontal bar in a gymnastics competition, and holding the nozzle with the other hand.　

FIG. 5(b) shows a nozzle cleaner 1 according to a second modification. The grip portion 4 or a portion of the grip portion 4 of the nozzle cleaner 1 has a hexagonal column shape that can be gripped by an electric screwdriver or drill chuck, and the nozzle cleaner 1 can be used as an electric cleaner. The grip portion 4 may be formed integrally with the polishing portion 2 and the base 3, or may be formed as a separate component and fixed to the polishing portion 2 and the base 3. The shape of the grip portion 4 is not limited to a hexagonal column shape, but may be any rod shape that can be gripped by a chuck. Further, although the nozzle cleaner 1 is thin enough to be operated by gripping the rod-shaped portion by hand, cleaning operations can be performed by gripping the outer circumferential surface of the base portion 3 with the thumb and forefinger. In this case, the base 3 functions as a grip part held by the operator, and the nozzle cleaner 1 can be used as a tool for manual cleaning work by the operator. The outer peripheral surface of the base 3 may be treated to prevent slipping.

FIG. 6 shows a nozzle cleaner 1 according to a third modification. In this nozzle cleaner 1, the shape of the chamfered portion 24 is asymmetrical, and in this point, it is different from the nozzle cleaner 1 having the symmetrical chamfered portion 24 shown in FIG. In this modification, of the two oblique sides with different lengths of the chamfered portion 24, the shorter oblique side has less inclination and is closer to the inner surface of the nozzle 90, so the shorter oblique side becomes the cutting edge 1a.　

The polishing blade 20a on which the chamfered portion 24 is formed may have an outer diameter smaller than that of the lower layer polishing blade 20 when viewed in the axial direction so that the approximate outer diameter of the polishing portion 2 becomes smaller at the tip. . The chamfered portion 24 may have an arbitrary slope and an arbitrary area. The chamfer 24 may be formed as a trapezoidal chamfer in which the cutting edge 1b is not formed on the polishing blade 20a. Furthermore, when the chamfer 24 is formed in a trapezoidal shape on the polishing blade 20a, the chamfer 24 may also be formed at the corner of the polishing blade 20b behind the polishing blade 20a.　

Further, the rotational position of the polishing blade 20a is not limited to 45 degrees, but may be set arbitrarily, and the difference in angular position of the polishing blade 20a and polishing blades 20b to 20d from the axial direction Ax is 30 degrees to 60 degrees. It is preferable that the angle be within the angle range of . The present invention is not limited to rotating only the polishing blades 20a, but any polishing blades 20 may be rotated with respect to each other or together, for example, in a spiral manner. Further, the nozzle cleaner 1 may have a configuration in which the configurations of the above-described embodiments and various modifications are combined with each other.　

According to the nozzle cleaner 1 of this embodiment, the polishing blade 20 having the cutting

edges

1a and 1b is provided at intervals in the axial direction Ax, and the

cutting edges

1a and 1b are not continuous along the axial direction Ax. Therefore, the load on the polishing section 2 is suppressed, and deposits inside the nozzle can be removed with less force, resulting in good operability. Moreover, since the polishing blade 20a and the polishing blade 20b are at different angular positions when viewed from the axial direction Ax, by pushing the polishing part 2 while turning it, the cutting edge of the polishing blade 20b can be changed from the

cutting edge

1a, 1b of the polishing blade 20a to the cutting edge of the polishing blade 20b. 1b can quickly take over the working blade edge, remove deposits efficiently, and have good operability. In other words, the structure in which the positions of the

polishing blades

20a and 20b are rotated has the effect that the next cutting edge hits the deposit at the point of interest on the inner surface of the nozzle by a slight rotation and pushing.　

FIG. 7 shows a nozzle cleaner 1 according to a fourth modification. This nozzle cleaner 1 is a nozzle cleaner that does not have the chamfered portion 24 on the polishing blade 20a of the nozzle cleaner 1 shown in FIGS. 1, 5, 6, etc. The polishing blade 20a of this nozzle cleaner 1 does not have an oblique cutting edge 1a, but only has a cutting edge 1b along the axial direction Ax.　

Although this nozzle cleaner 1 does not have a chamfered portion 24 and an oblique cutting edge 1a that serve as a guiding surface or a guiding cutting edge when inserted into a nozzle, it can avoid deposits scattered on the inner surface of the nozzle in many cases. The polishing blade 20a can be inserted into the nozzle. In this case, the nozzle cleaner 1 can remove the deposits with the cutting edge 1b of the polishing blade 20a by rotating the polishing part 2, and then perform final polishing with the subsequent polishing blades 20b to 20d.　

FIG. 8 shows a nozzle cleaner 1 according to another embodiment. The polishing section 2 of the nozzle cleaner 1 includes five polishing blades 20 (20a to 20e) each made of a pentagonal plate-shaped body when viewed in the axial direction, and arranged in the axial direction Ax at intervals. ing. Both of the polishing blades 20 are at the same rotational position about a common axis. In this case, the polishing part 2 has a pentagonal prism shape, and the polishing part 2 has five planes along the axial direction Ax, so processing with a milling machine becomes easy.　

The polishing blade 20a has chamfered portions 24 at five corners on the tip side, and the oblique edge forming the boundary of the chamfered portions 24 constitutes the cutting edge 1a. Further, the polishing blade 20a has a chamfered portion 24b parallel to the axial direction Ax so as to have a decagonal shape when viewed in the axial direction. The chamfered portion 24b is formed at the intersection of adjacent side wall surfaces parallel to the axial direction Ax of the plate-shaped body. An edge parallel to the axial direction Ax that forms the boundary of the chamfered portion 24b constitutes the cutting edge 1b.　

The cutting edge 1b formed by the chamfered portion 24b of the polishing blade 20a is located at a position where the rotational position around the axis is shifted from the cutting edge 1b of the rear polishing blade 20b, and has the effect of shifting the timing of polishing. Furthermore, the chamfered portion 24b of the polishing blade 20a has the effect of reducing the circumscribed circle of the polishing blade 20a, making it easier to insert the polishing part 2 into the nozzle.　

In the nozzle cleaner 1 according to this embodiment, in addition to the polishing part 2 polishing the inner surface of the nozzle, the base 3 can polish the end surface and the outer surface of the tip of the nozzle. The base 3 is a part of the polishing section 2 in the sense that the base 3 performs polishing in addition to the polishing section 2 .　

The polishing part 2 has a contact surface formed integrally with the polishing part 2 and having a larger diameter than the polishing part 2 on the upper surface side of the base part 3 on the rear side in the axial direction Ax. The contact surfaces are a contact surface 3a that can come into contact with the end surface of the nozzle during the cleaning operation, and a contact surface 3b that can come into contact with the outer surface of the tip of the nozzle. More specifically, the bottom surface and the outer wall surface of a circular groove having a rectangular cross section, which is formed in the surface of the disk-shaped base 3 on the tip side in the axial direction Ax, so that the tip of the nozzle can be inserted therein, are respectively They become a contact surface 3a and a contact surface 3b.　

A recess 3c is formed in the contact surfaces 3a, 3b. The edge forming the boundary between the contact surface 3a and the recess 3c becomes the cutting edge 1c for polishing the end face of the nozzle. Further, the edge forming the boundary between the contact surface 3b and the recess 3c serves as a cutting edge 1d for polishing the outer surface of the nozzle. The recess 3c is formed in the shape of a common groove by continuously cutting out the contact surfaces 3a, 3b from the outside of the base 3 toward the center. This groove-shaped recess 3c functions as a discharge groove for polishing debris generated when the end face of the nozzle and the outer surface of the end are polished by the

cutting edges

1c and 1d.　

In this embodiment, the recess 3c is formed in common on the contact surfaces 3a and 3b, but the recess formed in the contact surface 3a and the recess formed in the contact surface 3b are placed at different positions. It may be formed. In addition, the contact surfaces 3a and 3b are surfaces for forming the

cutting edges

1c and 1d at appropriate positions, and since it is sufficient to form the

cutting edges

1c and 1d so that the end surface and outer surface of the nozzle can be polished, the contact surfaces 3a and 3b are used as wide surfaces. It doesn't have to be distributed. For example, the opening area of the recess 3c may be several times larger than the area of the contact surfaces 3a and 3b.　

In the nozzle cleaner 1 of this embodiment, after inserting the polishing part 2 into the nozzle, the contact surface 3a is pressed against the end face of the nozzle and rotated in opposite directions to the right or left around the axis, so that the nozzle can be cleaned by the cutting edge 1c. The end face can be polished. Further, after inserting the polishing part 2 into the nozzle, the nozzle cleaner 1 presses the outer surface of the nozzle end and the cutting edge 1d against each other, and rotates each other to the right or left around the axis. The outer surface of the end of the nozzle can be polished by.　

In order to enable the outer surface of the nozzle end and the cutting edge 1d to contact and press each other, the polishing part 2 and the base part 3 are moved by tilting the polishing part 2 or shifting its center after inserting the polishing part 2 into the nozzle. It is sufficient to set tolerances and play that can change the mutual positions and inclinations of the nozzle and the polishing section 2 in the nozzle.　

Note that by making the connecting part between the polishing part 2 and the base part 3 thinner, the polishing part 2 can be tilted considerably while the end surface of the nozzle is in contact with the contact surface 3a, so that the outer surface of the nozzle end and It becomes easy to bring the blade edges 1d into contact with each other and press them. For example, if the rearmost polishing blade 20e of the polishing blades 20 in the nozzle cleaner 1 is replaced with a separation part 21, and the inner diameter of the contact surface 3a of the base 3 is reduced to the diameter of the separation part 21. good.　

FIGS. 9(a) and 9(b) show a nozzle cleaner 1 according to a fifth modification. The nozzle cleaner 1 of this modification has a structure in which the chamfered portion 24 in the nozzle cleaner 1 of FIG. 8 is formed across two polishing blades: the top layer polishing blade 20a and the polishing blade 20b immediately below it. Note that the chamfer 24 on the polishing blade 20a and the chamfer 24 on the polishing blade 20b immediately below it are not on the same plane. This nozzle cleaner 1 has a gentle slope at the tip of the polishing part 2 and a long blade edge 1a, so it is easy to insert into the nozzle and perform cleaning operations stably. can.　

In this modification, since the chamfered portions 24 of the

polishing blades

20a and 20b, and thus the cutting edge 1a, are continuous when viewed from the front of the nozzle cleaner 1 (FIG. 9(b)), the cutting edge 1a of the polishing blade 20a and the polishing blade The deposits can be continuously polished with the cutting edge 1a of the blade 20b. In order to enable such continuous polishing, in this modification, the chamfered portions 24 of the

polishing blades

20a, 20b are not on the same plane when viewed from the side. In order to reduce the effort required for cutting, the chamfered portions 24 of the

polishing blades

20a and 20b may be formed on the same plane, although the continuity of polishing is impaired.　

Note that the present invention is not limited to the above configuration and can be modified in various ways. For example, the external dimensions, internal dimensions, length, etc. of the polishing section 2 may be arbitrarily set according to the dimensions of the welding torch 9 to which the nozzle cleaner 1 is applied. The number of polishing blades 20 is not limited to four or five, but may be any number. The thickness of each polishing blade 20 and the thickness of each separation portion 21 may be individually arbitrary, and there may be a corner portion that does not become a cutting edge. Therefore, for example, in the nozzle cleaner 1 shown in FIG. 1, a gap is provided between the polishing blade 20d and the base 3, and the gap is made several times the thickness of the separating part 21 in FIG. The abrasive blades 20a to 20d may be concentrated at the tip to efficiently clean the deep part of the nozzle. Further, by providing this configuration with the

cutting edges

1c and 1d formed by the base 3 of FIG. 8, the outer surface of the nozzle can be easily polished.　

The polishing blade 20 is not limited to a plate-shaped body having a rectangular or pentagonal outer shape of the same size when viewed in the axial direction, but more generally, the polishing blade 20 is a plate-shaped body having a polygonal shape when viewed in the axial direction. It is sufficient that the outer circumferential edge of the plate-like body, which serves as an effective cutting edge, is in contact with the virtual circle 20R. Therefore, the polishing blade 20 may have a triangular or hexagonal or more polygonal shape when viewed in the axial direction. The polishing section 2 may be configured by a plurality of polishing blades 20 arranged along the axial direction Ax in any combination of polygonal plate bodies. Further, the cutting edge 1b does not need to be provided rotationally symmetrically on the virtual circle 20R, and the polygonal plate-like body forming the polishing blade 20 may also not be rotationally symmetrical.

1 Nozzle cleaner 1a Cutting edge (diagonal edge at the boundary of the chamfered part) 1b Cutting edge (edge in the axial direction of the polished blade) 1c Cutting edge (base edge, for nozzle end face) 1d Cutting edge (base edge, nozzle end outer surface) ) 2 Polishing part 20 Polishing blade 20a Polishing blade (first polishing blade) 20b, 20c, 20d, 20e Polishing blade (second polishing blade) 23

Hollow part

24, 24b Chamfer part 3 Base 3a End face of nozzle and Contact surface 3b Contact surface with the outer surface of the nozzle 3c Concave portion 4 Grip portion 9 Welding torch 90 Nozzle 91 Power supply tip

Claims

A nozzle cleaner for removing deposits attached to the surface of a nozzle of a welding torch, a polishing part insertable into the nozzle and extending in the axial direction when inserted, for polishing the inner surface of the nozzle; The polishing part is fixed and includes a gripping part having a diameter larger than the polishing part and held by an operator, and the polishing part has a plurality of polishing blades arranged in a row at intervals in the axial direction. A nozzle cleaner, characterized in that each of the polishing blades is formed of a polygonal plate-like body when viewed in the axial direction, and the edge of the plate-like body is a cutting edge.
Among the abrasive blades, when the abrasive blade on the tip side in the axial direction is defined as a first abrasive blade, and the abrasive blade on the rear side of this first abrasive blade is defined as a second abrasive blade, The nozzle cleaner according to claim 1, wherein the first polishing blade and the second polishing blade are arranged at different angular positions when viewed in the axial direction.
The first polishing blade and the second polishing blade have a rectangular shape when viewed in the axial direction, and the different angular positions of the first polishing blade and the second polishing blade when viewed in the axial direction are 30 degrees. The nozzle cleaner according to claim 2, wherein the nozzle cleaner is within an angular range of 60° to 60°.
4. The nozzle cleaner according to claim 2, wherein two or more polishing blades are provided on the rear side in the axial direction.
The polishing part has a cavity extending in the axial direction to avoid interference with the power supply tip when inserted into the nozzle, and the polishing blade on the tip side in the axial direction has a plate shape. 3. The nozzle cleaner according to claim 1, further comprising a chamfered portion formed by obliquely chamfering a corner portion on the tip side of the nozzle cleaner.
The polishing part has a contact surface integrally with the polishing part that is larger in diameter than the polishing part and can come into contact with an end surface and an outer surface of the nozzle during a cleaning operation, on the rear side in the axial direction. , wherein a recess is formed in the contact surface, and an edge forming a boundary between the contact surface and the recess serves as a cutting edge for polishing the end surface or outer surface of the nozzle. Item 2. The nozzle cleaner according to item 2.