JP2010051849A - Cleaning nozzle for square piping and intra-piping cleaning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning nozzle for square piping, for removing deposit stuck inside the piping whose cross section is square. <P>SOLUTION: The cleaning nozzle for the square piping includes: a shaft part connected to the distal end of a hose and provided in the inside with a hollow part for leading high pressure air from the hose; and a head cap part which is attached to the distal end of the shaft part, whose cross sectional shape is roughly triangular, and which is provided with a first inclined surface having a first scraping member, a second inclined surface having a second scraping member and a third surface configuring a third surface. A first discharge hole for communicating the hollow part and outer peripheral surface of the shaft part and discharging the high pressure air roughly in the axial direction is formed on the shaft part. A second discharge hole for communicating the hollow part and outer peripheral surface of the shaft part and discharging the high pressure air in a direction orthogonal to the axis is formed on the surface of the shaft part corresponding to the third surface of the head cap part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a square pipe cleaning nozzle for removing deposits adhering to a pipe having a square cross section, and an in-pipe cleaning apparatus using the cleaning nozzle.

  As an in-pipe cleaning device for removing deposits adhering to the inner wall surface of a pipe, a nozzle is attached to the tip of an air hose so that high-pressure air from the nozzle is blown onto the inner wall surface of the duct (for example, Patent Document 1) And cleaning robots that travel in ducts have been proposed.

  Simply spraying high-pressure air from the nozzle onto the inner wall surface of the pipe cannot reliably remove deposits firmly attached to the inner wall surface of the pipe. In addition, the cleaning robot has a problem that it is expensive and has a complicated structure. Therefore, an in-pipe cleaning nozzle has been proposed that can reliably remove and clean even deposits firmly attached to the inner wall surface of the pipe (see, for example, Patent Document 2).

The in-pipe cleaning nozzle disclosed in Patent Document 2 is connected to the tip of a hose that supplies high-pressure air. The jetted high-pressure air rotates the impeller and the head cap portion also rotates as the impeller rotates. By rotating, the cleaning nozzle turns along the inner wall surface of the pipe. Then, the high-pressure air injected to the impeller is discharged from the discharge hole, and the high-pressure air discharged from the discharge hole blows away deposits adhering to the inner wall surface of the pipe and gives a forward moving force to the cleaning nozzle. Therefore, the cleaning nozzle of patent document 2 cleans the deposits adhering to the inner wall surface of the pipe by propelling forward while turning along the inner wall surface of the pipe.
JP-A-10-339502 JP 2002-102812 A

  The in-pipe cleaning nozzle disclosed in Patent Document 2 is of a type in which the cleaning nozzle turns along the inner wall surface of the pipe having a substantially round cross section, and the arc of the inner periphery of the inner wall surface of the pipe; The outer shape of the cleaning nozzle is configured so that the outer arc of the rotating head cap portion matches.

  However, the piping to be cleaned includes not only a round type but also a square type. Since the outer shape of the round cleaning nozzle does not match the cross-sectional shape of the square pipe, the round cleaning nozzle cannot be applied to a pipe having a substantially square cross section.

  As in Patent Document 2, the applicant is aware of prior art documents related to a cleaning nozzle for round piping. However, the applicant is aware of the existence of prior art documents related to a cleaning nozzle for a square pipe that cleans while moving along the inner wall surface of the pipe having a square cross section by supplying high-pressure air from a hose. Not.

  Therefore, the technical problem to be solved by the present invention is to provide a square nozzle cleaning nozzle and a pipe cleaning, in which high-pressure air is supplied from a hose to perform cleaning while moving along the inner wall surface of the pipe having a square cross section. Is to provide a device.

In order to solve the above technical problem, according to the present invention,
A square pipe cleaning nozzle for removing deposits adhering to a pipe having a square cross section,
A shaft part connected to the tip of the hose and having a hollow part for guiding high-pressure air from the hose inside;
A first inclined surface having a first scraping member, a second inclined surface having a second scraping member, a third inclined surface attached to the tip of the shaft portion and having a substantially triangular cross-section. A head cap portion having a third surface constituting the surface, and
The shaft portion is formed with a first discharge hole that communicates the hollow portion and the outer peripheral surface of the shaft portion and discharges high-pressure air in a substantially axial direction.
A second discharge hole that communicates the hollow portion and the outer peripheral surface of the shaft portion and discharges high-pressure air in the direction perpendicular to the axis is formed on the surface of the shaft portion corresponding to the third surface of the head cap portion. A cleaning nozzle for rectangular piping is provided.

  According to the said structure, a forward movement thrust is formed with the high pressure air discharge | released from the 1st discharge | release hole. For example, when the first inclined surface of the head cap portion having a substantially triangular shape is disposed so as to face the bottom wall surface, the high-pressure air discharged from the second discharge hole of the shaft portion is Facing diagonally upward. The diagonally upward high-pressure air discharged from the second discharge hole has, as its reaction, a wall moving force that attempts to move in parallel along the bottom wall surface and a wall pressing force that acts on the bottom wall surface of the square pipe. Form.

  The first scraping member is brought into close contact with the bottom wall surface by the wall surface pressing force, and the nozzle is slidably moved along the bottom wall surface by the wall surface moving force. As a result, even deposits firmly attached to the bottom wall surface of the square pipe can be reliably removed and cleaned.

  When the nozzle slidingly moving along the bottom wall surface reaches the corner of the square pipe, the nozzle rotates by twisting the hose so that the first inclined surface faces the next inner wall surface to be cleaned. One inclined surface faces the next inner wall surface to be cleaned.

  Even on the next inner wall surface to be cleaned, the nozzle is slidably moved along the next inner wall surface by the wall surface moving force and the wall surface pressing force formed from the obliquely upward high pressure air discharged from the second discharge hole. As a result, the deposit adhering to the next inner wall surface is removed. By repeating such a series of operations, the nozzle sequentially slides and moves on each inner wall surface of the rectangular pipe, and as a result, deposits attached to each inner wall surface of the rectangular pipe are removed.

  When the above operation is performed in the clockwise rotation direction of the square pipe, the substantially triangular shape of the cross section is the first inclined surface so that the same operation can be performed in the counterclockwise rotation direction. Preferably, the length and the length of the second inclined surface are substantially isosceles triangles.

  For example, the apex angle formed by the first inclined surface and the second inclined surface is approximately 30 degrees to approximately 90 degrees.

  More preferably, the apex angle formed by the first inclined surface and the second inclined surface is approximately 60 degrees.

  When the nozzle rotates at the corner portion of the square pipe, the end portion on the third surface side of the first inclined surface or the second inclined surface collides with the inner wall surface, thereby generating a collision sound. Therefore, preferably, a cushioning member extending in a direction orthogonal to the third surface is further provided on the third surface side of the head cap portion.

  When the nozzle reaches the corner of the square pipe, the cleaning operator twists the hose to rotate the nozzle. It is also possible to automatically rotate the nozzle in a predetermined direction by using the force with which the nozzle slidingly moving on an inner wall surface collides with the next inner wall surface to be cleaned. Therefore, the first inclined surface and the second inclined surface are configured to extend in a direction orthogonal to the first inclined surface and the second inclined surface and to be retracted from the front end portion of the scraping member. Each rotation support member may be provided.

  According to the above configuration, for example, when the nozzle slidingly moving along the bottom wall surface reaches the corner portion of the square pipe and the first inclined surface faces the next inner wall surface to be cleaned, the second inclined surface side After the tip of the rotation support member collides with the inner wall surface to be cleaned next, the nozzle rotates around the tip of the rotation support member on the first inclined surface side as the rotation center.

  It is preferable that the distal end portion of the rotation support member has a roundness so that the collision sound generated when the nozzle collides with the next inner wall surface to be cleaned can be reduced and the nozzle can rotate smoothly.

The above-described square pipe cleaning nozzle is
A hose to which a square pipe cleaning nozzle is attached;
High-pressure air supply means for supplying high-pressure air into the hose;
It is used by being incorporated in an in-pipe cleaning device comprising dust collecting means for sucking and collecting dust in the pipe.

  Hereinafter, a square pipe cleaning nozzle 2 according to an embodiment of the present invention and an in-pipe cleaning device 150 using the square pipe cleaning nozzle 2 will be described with reference to FIGS. However, it explains in detail. In the following description, terms indicating a specific direction (for example, “up”, “down”, “left”, “right”, and other terms including them, “clockwise direction”, “counterclockwise” ”) Is used to facilitate understanding of the invention with reference to the drawings, and the present invention should not be construed as being limited by the meaning of these terms.

  Drawing 1 is an explanatory view of cleaning nozzle 2 for square piping concerning a first embodiment of the present invention. (A) is a plan view of the nozzle 2, (B) is a sectional view taken along the line AA of (A), (C) is a view of the nozzle 2 as viewed from the front, and (D) is the nozzle 2. It is the rear view which looked at from the hose 4 side. FIG. 2 is a diagram for explaining how the square pipe cleaning nozzle 2 shown in FIG. 1 cleans the inner wall surface 61 of the square pipe 60 while rotating clockwise. FIG. 3 is a view for explaining how the square pipe cleaning nozzle 2 shown in FIG. 1 cleans the inner wall surface 61 of the square pipe 60 while rotating counterclockwise. FIG. 4 is an explanatory diagram of the square pipe cleaning nozzle 2 according to the second embodiment of the present invention. (A) is a plan view of the nozzle 2, (B) is a sectional view taken along the line AA of (A), (C) is a view of the nozzle 2 as viewed from the front, and (D) is the nozzle 2. It is the rear view which looked at from the hose 4 side. FIG. 5 is a diagram for partially explaining how the square pipe cleaning nozzle 2 shown in FIG. 4 cleans the inner wall surface 61 of the square pipe 60 while rotating clockwise. FIG. 6 is a view for partially explaining how the square pipe cleaning nozzle 2 shown in FIG. 4 cleans the inner wall surface 61 of the square pipe 60 while rotating clockwise. FIG. 7 is a diagram for partially explaining how the square pipe cleaning nozzle 2 shown in FIG. 4 cleans the inner wall surface 61 of the square pipe 60 while rotating clockwise. FIG. 8 is a schematic diagram for explaining the overall configuration of the in-pipe cleaning apparatus 150 using the square pipe cleaning nozzle 2 shown in FIG. FIG. 9 is an explanatory view showing a cleaning state of the inner wall surface 61 of the square pipe 60 by the pipe cleaning nozzle 2 shown in FIG.

  First, the overall configuration of the square pipe cleaning nozzle 2 according to the first embodiment of the present invention will be described with reference to FIG.

  The square pipe cleaning nozzle 2 is generally composed of a shaft portion 10 and a head cap portion 20.

  The shaft portion 10 is made of a material having rigidity such as a metal material or engineering plastic, and is used by being inserted into the tip portion of the hose 4. The shaft portion 10 is formed with a hollow portion 14 having a hollow structure in which one end side of the shaft portion main body, that is, the hose 4 side is opened, and the other end side, that is, the head cap portion 20 side is closed.

  The shaft portion 10 includes a hose attachment portion 13, a central portion 12, and a protruding portion 15 in order from the hose 4 side. The hose attachment portion 13 has a tubular shape, and is configured to be inserted into a distal end portion of a flexible hose 4 such as a pressure-resistant mesh-containing hose so that the hose 4 is hermetically connected. The central portion 12 has a larger diameter than the front end of the hose attachment portion 13. The protruding portion 15 has a smaller diameter than the front end of the central portion 12, and has an outer diameter that is approximately the same as that of the hose attachment portion 13. A convex screw is formed on the outer peripheral surface of the protrusion 15.

  A through hole is formed in the central portion of the protruding portion 15, and is screwed by a screw 44 in a state where the protruding portion 15 (convex screw) is screwed into an insertion hole 24 (concave screw) of the head cap portion 20 described later. It is fixed.

  The hollow portion 14 described above extends to all of the hose attachment portion 13 and most of the central portion 12.

  In the central part 12, four first discharge holes 11 extending from the central part toward the rear end side are formed. As shown in FIGS. 1A and 1D, each first discharge hole 11 extends obliquely rearward with respect to the axis. Four first discharge holes 11 are equally arranged at an angle of about 90 degrees. Each first discharge hole 11 communicates the hollow portion 14 of the central portion 12 and the outside of the rear end outer peripheral portion of the central portion 12 to blow out the first discharge high-pressure air 7 branched from the high-pressure air 6 obliquely rearward. belongs to. In addition, the communication path of the 1st discharge | release hole 11 which connects the hollow part 14 of the center part 12 and the external field of the rear-end outer peripheral part of the center part 12 does not necessarily need to be extended in the shortest distance, and is 1st discharge | release. If the high-pressure air 7 can be discharged in a predetermined direction, a configuration in which the communication path is detoured due to a curve or the like in the middle of the communication path may be employed. Further, the number of the first discharge holes 11 is not limited to four. For example, the two first discharge holes 11 are equally arranged at an angle of about 180 degrees, or the three first discharge holes 11 are arranged. May be evenly arranged at an angle of about 120 degrees so as to be able to uniformly blow out obliquely backward from the plurality of first discharge holes 11.

  Further, one second discharge hole 18 is formed in the central portion of the central portion 12. As shown in FIG. 1B, the second discharge hole 18 extends so as to be orthogonal to the axis. The second discharge hole 18 communicates the hollow portion 14 of the central portion 12 and the outside of the central portion of the central portion 12 to blow out the second high-pressure air 8 branched from the high-pressure air 6 downward.

  The head cap portion 20 is made of a material having rigidity such as a metal material or an engineering plastic. The head cap portion 20 includes a proximal end portion 22 and a distal end portion 23 in order from the hose 4 side.

  The base end portion 22 of the head cap portion 20 has therein an insertion hole and a through hole in which a concave screw having the same size as the convex screw formed on the outer periphery of the protruding portion 15 of the shaft portion 10 is formed. A concave screw is formed on the third surface 28 side of the through hole. And the protrusion part 15 is mounted | worn with the insertion hole. The head cap portion 20 and the shaft portion 10 are integrated by fixing with a screw 44 in a state where the convex screw of the protruding portion 15 is screwed into the concave screw of the insertion hole of the base end portion 22. In order to reduce the weight of the head cap portion 20, the end portion 23 is cut out in a substantially triangular prism shape from the third surface 28 side.

  The head cap portion 20 has a substantially triangular cross-sectional shape. The first inclined surface 25 in which the first scraping member 50 is disposed and the second slope in which the second scraping member 51 is disposed. It has three surfaces including a surface 26 and a third surface 28 constituting a third surface. The first inclined surface 25 and the second inclined surface 26 have substantially the same dimensions and form an approximately isosceles triangle. When the dimensions of the third surface 28 are also equal to the dimensions of the first inclined surface 25 and the second inclined surface 26, the cross-sectional shape of the head cap portion 20 is substantially a regular triangle.

  As will be described later, the reaction force of the injection force due to the discharge of the second discharge high-pressure air 8 is divided into a lateral movement thrust and a wall pressing force to the inner wall surface 61. The angle β formed by the injection force of the second discharge high-pressure air 8 with respect to the opposing inner wall surface 61 is half the apex angle α formed by the first inclined surface 25 and the second inclined surface 26. For example, if the apex angle α is 60 degrees, the angle β formed by the injection force of the second discharge high-pressure air 8 with respect to the opposing inner wall surface 61 is 30 degrees.

  And if the angle (beta) which the injection force of the 2nd discharge | release high pressure air 8 with respect to the opposing inner wall surface 61 makes is large, the ratio of the wall surface pressing force to the inner wall surface 61 with respect to the movement thrust to a horizontal direction will become relatively large. Although the injection force of the second discharge high-pressure air 8 and the friction with the deposit 63 attached to the inner wall surface 61 of the square pipe 60 are related, if the wall pressing force on the inner wall surface 61 is relatively large, The friction resistance between the wall surface 61 and the brushes 50 and 51 is increased, and the lateral movement thrust is insufficient, so that the square pipe cleaning nozzle 2 does not move in the lateral direction.

  On the contrary, if the angle β formed by the injection force of the second discharge high-pressure air 8 with respect to the opposing inner wall surface 61 is small, the ratio of the wall pressing force to the inner wall surface 61 relative to the lateral movement thrust becomes relatively small. If the wall pressing force on the inner wall surface 61 is relatively small, for example, when the apex angle α formed by the first inclined surface 25 and the second inclined surface 26 is smaller than about 30 degrees, the square pipe cleaning nozzle is used. When 2 moves on the upper wall surface 66, the wall surface pressing force to the inner wall surface 61 is defeated by the weights of the square pipe cleaning nozzle 2 and the hose 4, and the square pipe cleaning nozzle 2 falls. In addition, when the apex angle α formed by the first inclined surface 25 and the second inclined surface 26 is larger than approximately 90 degrees, the wall surface pressing force to the inner wall surface 61 is relatively large, and the lateral movement is performed. Since the thrust is relatively small, the lateral movement thrust is lost to the frictional resistance between the inner wall surface 61 and the brushes 50 and 51, and the square pipe cleaning nozzle 2 does not move in the lateral direction.

  Accordingly, the apex angle α formed by the first inclined surface 25 and the second inclined surface 26 of the head cap portion 20 is preferably, for example, approximately 30 degrees to approximately 90 degrees.

  From the viewpoint that the balance between the lateral movement thrust and the wall pressing force to the inner wall surface 61 is good, and the square pipe cleaning nozzle 2 moves and rotates in the lateral direction in a stable posture. More preferably, the apex angle α formed by the first inclined surface 25 and the second inclined surface 26 is approximately 60 degrees, and the cross-sectional shape of the head cap portion 20 is a substantially equilateral triangle.

  On each of the first inclined surface 25 and the second inclined surface 26, a first brush 50 and a second brush 51 as a scraping member are provided from the base end portion 22 side to the distal end portion 23 side. 26 is fixedly erected so as to be orthogonal to. The tip portions of the brushes 50 and 51 are parallel to the inclined surfaces 25 and 26, and this portion is a sliding contact portion that is in sliding contact with the inner wall surface 61 of the square pipe 60. The brushes 50 and 51 are planted densely or spaced apart from the inclined surfaces 25 and 26. The material of the brushes 50 and 51 is appropriately selected according to the deposit 63 to be cleaned. The brushes 50 and 51 are made of rigid chemical fibers such as nylon and polypropylene, steel wires, piano wires, brass wires, or the like. Consists of metal wires. The scraping member may be a fiber-like or wire-like elastically deformable member such as the brushes 50 and 51, or a blade-like plate.

  The third surface 28 is provided with a buffer member 52 extending in a direction orthogonal to the third surface 28. For example, a third brush 52 whose tip is parallel to the third surface 28 is used. When the nozzle 2 rotates at the corner portion of the rectangular pipe 60, the buffer member 52, when the end portion on the third surface 28 side of the first inclined surface 25 or the second inclined surface 26 collides with the inner wall surface 61, The third surface 28 directly hits the bottom wall surface 62 when the third surface 28 of the nozzle 2 moves to face the bottom wall surface 62 in order to prevent the inner wall surface 61 from being damaged or to generate abnormal noise. It is for preventing. Therefore, as the buffer member 52, one that can be elastically deformed to absorb an impact is used. For example, a needle-like body such as a rubber material or the brush can be implanted.

  Next, a usage pattern of the square pipe cleaning nozzle 2 according to the first embodiment of the present invention will be described with reference to FIGS. In the following description of FIG. 2, the square pipe cleaning nozzle 2 connected to the hose 4 rotates clockwise, and in the description of FIG. 3, the square pipe cleaning nozzle 2 connected to the hose 4. Shall perform a counterclockwise turn. Moreover, although the case where a cross section consists of a tetrahedron square shape is demonstrated as the square piping 60, the square piping 60 is not limited only to a tetrahedron, a pentahedron, a hexahedron, a hepahedron, It may be a polyhedron such as an octahedron.

  First, FIG. 2 shows a case where the square pipe 60 is formed of a square or rectangular square shape having a tetrahedron cross section and the square pipe cleaning nozzle 2 having a substantially equilateral triangle cross section rotates in a clockwise direction. The description will be given with reference.

  The cleaning pipe 2 connected to the hose 4 is cleaned by the cleaning operator so that the third brush 52 is in contact with the bottom wall surface 62 and the second brush 51 is in contact with the right wall surface 68. 60 is placed at the lower right corner. When the high-pressure air 6 is introduced into the hose 4, the hose 4 that has been slackened and curved expands in a straight line, and the square pipe cleaning nozzle 2 contacts the bottom wall surface 62 and the right wall surface 68 of the square pipe 60 and moves forward Move to.

  When the square pipe cleaning nozzle 2 reaches a predetermined position, the cleaning operator twists the hose 4 counterclockwise so that the first brush 50 is positioned in contact with the bottom wall surface 62. Then, the pressure of the high-pressure air 6 is increased to a predetermined pressure.

  The high-pressure air 6 introduced into the shaft portion 10 via the hose 4 is branched into the first discharge hole 11 and the second discharge hole 18 in the hollow portion 14. Since the first discharge high-pressure air 7 discharged from the four first discharge holes 11 is discharged obliquely rearward, it is combined with the rear high-pressure air discharge output. A forward force is generated as a reaction of the rear high-pressure air discharge output, and the forward force functions as a forward moving thrust that moves the square pipe cleaning nozzle 2 forward.

  In addition, when the second discharge high-pressure air 8 discharged from the second discharge hole 18 is at the position (i) in FIG. 2, the second discharge high-pressure air 8 is discharged obliquely to the upper right at an angle β. As an output reaction, a diagonally downward left force is generated. The diagonally downward left force is divided into a leftward force and a vertically downward force. The leftward force functions as a leftward moving thrust that moves the square pipe cleaning nozzle 2 in the leftward direction. The vertical downward force presses the square pipe cleaning nozzle 2 downward against the bottom wall surface 62 of the square pipe 60, and this downward wall pressing force is a square shape with respect to the bottom wall surface 62 of the square pipe 60. It acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the bottom wall surface 62 increases.

  By such a leftward force and a vertically downward force, the square pipe cleaning nozzle 2 goes straight to the left while scraping off the deposit 63 on the bottom wall surface 62 as shown in FIG. It stops temporarily when it hits 64.

  The cleaning operator twists the hose 4 clockwise at an angle of approximately 90 degrees with respect to the square piping cleaning nozzle 2 that is temporarily stopped at the lower left corner where the bottom wall surface 62 and the left wall surface 64 intersect. Thus, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the left wall surface 64.

  At this time, since the second discharge high-pressure air 8 is discharged obliquely downward and to the right at an angle β, a diagonally upward and upward force is generated as a reaction of the diagonally downward and high-pressure air discharge. The diagonally upward left force is divided into an upward force and a horizontal leftward force. The upward force functions as an upward movement thrust that moves the square pipe cleaning nozzle 2 upward. The horizontal left-facing force presses the square pipe cleaning nozzle 2 leftward against the left wall surface 64 of the square pipe 60, and this left-side wall pressing force is a square shape with respect to the left wall surface 64 of the square pipe 60. It acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the left wall surface 64 increases.

  Due to such upward force and horizontal leftward force, the square pipe cleaning nozzle 2 goes straight upward while scraping off the deposit 63 on the left wall surface 64 as shown in FIG. It stops temporarily when it hits 66.

  The cleaning operator twists the hose 4 clockwise at an angle of approximately 90 degrees with respect to the square piping cleaning nozzle 2 temporarily stopped at the upper left corner where the left wall surface 64 and the upper wall surface 66 intersect. Thus, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the upper wall surface 66.

  At this time, since the second released high-pressure air 8 is released obliquely downward and leftward at an angle β, a diagonally upper-right force is generated as a reaction of the diagonally downward and downward high-pressure air discharge. The diagonally upper right force is divided into a right force and a vertically upward force. The rightward force functions as a rightward moving thrust that moves the square pipe cleaning nozzle 2 to the right. The vertical upward force presses the square pipe cleaning nozzle 2 upward against the upper wall surface 66 of the square pipe 60, and this upward wall pressing force is a square shape with respect to the upper wall surface 66 of the square pipe 60. This acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the upper wall surface 66 increases.

  By such a rightward force and a vertically upward force, the square pipe cleaning nozzle 2 goes straight to the right while scraping off the deposit 63 on the upper wall surface 66 as shown in FIG. When it hits 68, it stops temporarily.

  The cleaning operator twists the hose 4 clockwise at an angle of about 90 degrees with respect to the square piping cleaning nozzle 2 temporarily stopped at the upper right corner where the upper wall surface 66 and the right wall surface 68 intersect. As a result, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the right wall surface 68.

  At this time, since the second released high-pressure air 8 is discharged obliquely upward and leftward at an angle β, a diagonally downward-right force is generated as a reaction of the diagonally upward left-side high-pressure air discharge. The diagonally downward right force is divided into a downward force and a horizontal right force. The downward force functions as a downward movement thrust force that moves the square pipe cleaning nozzle 2 downward. The horizontal rightward force presses the square pipe cleaning nozzle 2 to the right against the right wall surface 68 of the square pipe 60, and this rightward wall pressing force is a square shape against the right wall 68 of the square pipe 60. It acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the right wall surface 68 increases.

  Due to such downward force and horizontal rightward force, the square pipe cleaning nozzle 2 advances downward while scraping off the deposit 63 on the right wall surface 68 as shown in FIG. When it hits 62, it stops temporarily.

  The cleaning operator twists the hose 4 clockwise at an angle of approximately 90 degrees with respect to the square piping cleaning nozzle 2 that is temporarily stopped at the lower right corner where the right wall surface 68 and the bottom wall surface 62 intersect. As a result, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the bottom wall surface 62.

  At this time, since the second discharge high-pressure air 8 is discharged obliquely in the upper right direction at an angle β, a force in the lower left direction is generated as a reaction of the high-pressure air discharge output in the upper right direction. The diagonally downward left force is divided into a leftward force and a vertically downward force. By such a leftward force and a vertically downward force, the square pipe cleaning nozzle 2 goes straight to the left while scraping off the deposit 63 on the bottom wall surface 62 as shown in FIG. It stops temporarily when it hits 64.

  The square pipe cleaning nozzle 2 rotates clockwise with respect to the square pipe 60 having a tetrahedral cross section by repeating the movements (ii), (iii), (iv), and (v) of FIG. Perform a swivel motion.

  If the square pipe cleaning nozzle 2 repeats the clockwise turning motion, the hose 4 is twisted and the clockwise turning motion cannot be continued. Therefore, in order to eliminate the twist of the hose 4, a counterclockwise turning motion is performed. A case where the nozzle 2 turns counterclockwise will be described with reference to FIG.

  When the turning motion of the square pipe cleaning nozzle 2 stops due to the twist of the hose 4, the cleaning operator appropriately twists the hose 4 counterclockwise with respect to the square pipe cleaning nozzle 2, whereby the second brush 51 is The square pipe cleaning nozzle 2 is positioned so as to be in contact with the bottom wall surface 62.

  The high-pressure air 6 introduced into the shaft portion 10 via the hose 4 is branched into the first discharge hole 11 and the second discharge hole 18 in the hollow portion 14. Since all of the first discharge high-pressure air 7 discharged from the four first discharge holes 11 is discharged obliquely rearward, the resultant is combined with the rearward high-pressure air discharge output. A forward force is generated as a reaction of the rear high-pressure air discharge output, and the forward force functions as a forward moving thrust that moves the square pipe cleaning nozzle 2 forward.

  Further, when the second discharge high-pressure air 8 discharged from the second discharge hole 18 is at the position (i) in FIG. 3, the second discharge high-pressure air 8 is discharged obliquely upward to the left at an angle β. As an output reaction, a diagonally downward force is generated. The diagonally downward force is divided into a rightward force and a vertically downward force. The rightward force functions as a rightward moving thrust that moves the square pipe cleaning nozzle 2 to the right. The vertical downward force presses the square pipe cleaning nozzle 2 downward against the bottom wall surface 62 of the square pipe 60, and this downward wall pressing force is a square shape with respect to the bottom wall surface 62 of the square pipe 60. It acts to increase the sliding contact of the second brush 51 of the piping cleaning nozzle 2, and the cleaning force of the second brush 51 against the deposit 63 on the bottom wall surface 62 increases.

  By such a rightward force and a vertically downward force, the square pipe cleaning nozzle 2 goes straight to the right while scraping off the deposit 63 on the bottom wall surface 62 as shown in FIG. When it hits 68, it stops temporarily.

  The cleaning operator twists the hose 4 counterclockwise at an angle of approximately 90 degrees with respect to the rectangular piping cleaning nozzle 2 that is temporarily stopped at the lower right corner where the bottom wall surface 62 and the right surface 68 intersect. Thus, the second brush 51 of the square pipe cleaning nozzle 2 comes into contact with the right wall surface 68.

  At this time, since the second released high-pressure air 8 is released obliquely downward and leftward at an angle β, a diagonally upper-right force is generated as a reaction of the diagonally downward and downward high-pressure air discharge. The diagonally upper right force is divided into an upward force and a horizontal right force. The upward force functions as an upward movement thrust that moves the square pipe cleaning nozzle 2 upward. The horizontal rightward force presses the square pipe cleaning nozzle 2 to the right with respect to the right wall surface 68 of the square pipe 60, and the right wall pressing force is a square with respect to the right wall surface 64 of the square pipe 60. It acts to increase the sliding contact of the second brush 51 of the piping cleaning nozzle 2, and the cleaning force of the second brush 51 against the deposit 63 on the right wall surface 64 increases.

  With such upward force and horizontal rightward force, the square pipe cleaning nozzle 2 moves straight upward while scraping off the deposit 63 on the right wall surface 68 as shown in FIG. It stops temporarily when it hits 66.

  The cleaning operator twists the hose 4 counterclockwise at an angle of about 90 degrees with respect to the square pipe cleaning nozzle 2 temporarily stopped at the upper right corner where the right wall surface 68 and the upper wall surface 66 intersect. As a result, the second brush 51 of the square pipe cleaning nozzle 2 comes into contact with the upper wall surface 66.

  At this time, since the second discharge high-pressure air 8 is discharged obliquely downward and to the right at an angle β, a diagonally upward and upward force is generated as a reaction of the diagonally downward and high-pressure air discharge. The diagonally upward left force is divided into a leftward force and a vertically upward force. The leftward force functions as a leftward moving thrust that moves the square pipe cleaning nozzle 2 in the leftward direction. The vertical upward force presses the square pipe cleaning nozzle 2 upward against the upper wall surface 66 of the square pipe 60, and this upward wall pressing force is a square shape with respect to the upper wall surface 66 of the square pipe 60. It acts to increase the sliding contact of the second brush 51 of the piping cleaning nozzle 2, and the cleaning force of the second brush 51 against the deposit 63 on the upper wall surface 66 increases.

  With such a leftward force and a vertically upward force, the square pipe cleaning nozzle 2 goes straight to the left while scraping off the deposit 63 on the upper wall surface 66 as shown in FIG. It stops temporarily when it hits 64.

  The cleaning operator twists the hose 4 counterclockwise at an angle of approximately 90 degrees with respect to the rectangular piping cleaning nozzle 2 that is temporarily stopped at the upper left corner where the upper wall surface 66 and the left wall surface 64 intersect. Thus, the second brush 51 of the square pipe cleaning nozzle 2 comes into contact with the left wall surface 64.

  At this time, since the second discharge high-pressure air 8 is discharged obliquely in the upper right direction at an angle β, a force in the lower left direction is generated as a reaction of the high-pressure air discharge output in the upper right direction. The diagonally downward left force is divided into a downward force and a horizontal leftward force. The downward force functions as a downward movement thrust force that moves the square pipe cleaning nozzle 2 downward. The horizontal leftward force presses the square pipe cleaning nozzle 2 to the right with respect to the left wall surface 64 of the square pipe 60, and this leftward wall pressing force is a square with respect to the left wall surface 64 of the square pipe 60. It acts to increase the sliding contact of the second brush 51 of the piping cleaning nozzle 2, and the cleaning force of the second brush 51 against the deposit 63 on the left wall surface 64 increases.

  Due to such downward force and horizontal leftward force, the square pipe cleaning nozzle 2 goes straight downward while scraping off the deposit 63 on the left wall surface 64 as shown in FIG. When it hits 62, it stops temporarily.

  The cleaning operator twists the hose 4 counterclockwise at an angle of approximately 90 degrees with respect to the square piping cleaning nozzle 2 temporarily stopped at the lower left corner where the left wall surface 68 and the bottom wall surface 62 intersect. As a result, the second brush 51 of the square pipe cleaning nozzle 2 comes into contact with the bottom wall surface 62.

  At this time, since the second released high-pressure air 8 is discharged obliquely upward and leftward at an angle β, a diagonally downward-right force is generated as a reaction of the diagonally upward left-side high-pressure air discharge. The diagonally downward force is divided into a rightward force and a vertically downward force. By such a rightward force and a vertically downward force, the square pipe cleaning nozzle 2 goes straight to the right while scraping off the deposit 63 on the bottom wall surface 62 as shown in FIG. When it hits 68, it stops temporarily.

  The square pipe cleaning nozzle 2 is counterclockwise with respect to the square pipe 60 having a tetrahedral cross section by repeating the movements of (ii), (iii), (iv), and (v) in FIG. Rotate around.

  By alternately performing such clockwise rotation and counterclockwise rotation, the brushes 50 and 51 attached to the head cap unit 20 scrape the deposit 63, so that the deposit 63 becomes a square pipe 60. The inner wall surface 61 is peeled off. As a result of the clockwise and counterclockwise turning motions of the square pipe cleaning nozzle 2 being alternately repeated, the square pipe cleaning nozzle 2 is deposited on the bottom wall surface 61 of the square pipe 60. But it can be reliably removed and cleaned.

  The deposit 63 peeled off from the inner wall surface 61 of the square pipe 60 is collected by the pipe cleaning device 150 shown in FIG. 8 shown as an example.

  As shown in FIG. 8, the above-described square pipe cleaning nozzle 2 and hose 4 are incorporated in a pipe cleaning device 150.

  The tip of the hose 4 to which the square pipe cleaning nozzle 2 is attached is inserted into the interior from the outlet 151 of the square pipe 60 to be cleaned. The hose 4 is lowered to the floor via a stepladder 152 and is wound around the hose reel 153 with an appropriate length. The hose 4 is connected to a compressor 155 mounted on the outdoor vehicle 154 so that high-pressure air 6 is supplied. A suction pad 156 is attached to the outlet 151 of the rectangular pipe 60, and the suction pad 156 is sequentially connected to a cyclone type recovery tank 158, a dust collector 159, and a filter 160 via a suction hose 157. The power source of the dust collector 159 is connected to the generator 162 of the outdoor vehicle 154 via the extension cord 161 so that electric power is supplied.

  In this in-pipe cleaning device 150, the high-pressure air 6 supplied from the compressor 155 is supplied to the square pipe cleaning nozzle 2 via the hose 4, and repeats the swiveling and forward movement as described above, while The deposit 63 attached to the inner wall surface 61 is removed. The air in the square pipe 60 including the deposit 63 peeled off by the square pipe cleaning nozzle 2 is sucked into the suction pad 156 of the outlet 151 by the injection force of the first discharge high-pressure air 7 and the suction force of the dust collector 159. It enters the recovery tank 158 via the hose 157, and the large particle deposit 63 is recovered in the recovery tank 158. The air that has passed through the recovery tank 158 enters the dust collector 159, and the deposit 63 is almost collected by the dust collector 159. The air that has passed through the dust collector 159 enters the filter 160, the fine particle deposit 63 is removed by the filter 160, and the air is discharged into the room as clean air. For this reason, indoor air is not polluted.

  Next, the square pipe cleaning nozzle 2 according to the second embodiment of the present invention will be described in detail with reference to FIGS.

  The square pipe cleaning nozzle 2 according to the second embodiment of the present invention is different from the square pipe cleaning nozzle 2 according to the first embodiment described above in that it further includes rotation support members 70 and 71. is doing. Therefore, the square pipe cleaning nozzle 2 according to the second embodiment will be described focusing on the provision of the rotation support members 70 and 71.

  As shown in FIG. 4, the 1st rotation support member 70 and the 2nd rotation support member 71 are installed with respect to the 1st inclined surface 25 and the 2nd inclined surface 26, respectively. The first rotation support member 70 and the second rotation support member 71 extend in directions orthogonal to the first inclined surface 25 and the second inclined surface 26, respectively, and the first brush 50 and the second brush. It is comprised so that it may withdraw from each front-end | tip part of 51. FIG. The first rotation support member 70 and the second rotation support member 71 are made of a rigid material such as a metal material or engineering plastic.

  The first rotation support member 70 and the second rotation support member 71 have tip portions 72 and 73 on the side of the apex angle α formed by the first inclined surface 25 and the second inclined surface 26, respectively. The tip portions 72 and 73 are elastically deformed although the brushes 50 and 51 first collide when the square pipe cleaning nozzle 2 collides with the inner wall surface 61 at the corner of the square pipe 60. Therefore, it functions as a rigid collision point where the rigid body collides first or as a rotation center for rotating the square pipe cleaning nozzle 2. The tip portions 72 and 73 are preferably rounded in order to reduce the impact at the time of collision and realize smooth rotation.

  In addition, although the 1st rotation support member 70 and the 2nd rotation support member 71 which were shown in FIG. 4 are respectively triangular plate-shaped bodies, they are not limited to the said shape. The first rotation support member 70 and the second rotation support member 71 may be a square plate or rod.

  By providing the first rotation support member 70 and the second rotation support member 71 in the first inclined surface 25 and the second inclined surface 26, the square pipe cleaning nozzle 2 collides with the inner wall surface 61 at the corner portion of the square pipe 60. In this case, the square pipe cleaning nozzle 2 stops, but the square pipe cleaning nozzle 2 rotates approximately 90 degrees by the reaction of the collision. Therefore, as in the first embodiment described above, the operation of rotating the square pipe cleaning nozzle 2 by approximately 90 degrees by twisting the hose 4 by the cleaning operator is unnecessary, and the square pipe cleaning nozzle 2 is not provided with the square pipe. Rotates automatically at 60 corners.

  Next, a usage pattern of the square pipe cleaning nozzle 2 according to the second embodiment of the present invention will be described with reference to FIGS. In the following description, the case where the square pipe cleaning nozzle 2 connected to the hose 4 turns clockwise will be described, but the square pipe connected to the hose 4 as in the first embodiment. The cleaning nozzle 2 also turns counterclockwise.

  As shown in FIG. 5, the cleaning pipe 2 connected to the hose 4 is cleaned by a cleaning operator so that the third brush 52 is in contact with the bottom wall surface 62 and the bottom wall surface of the rectangular pipe 60 to be cleaned. 62. When the high-pressure air 6 is introduced into the hose 4, the hose 4 that has been slackened and curved expands linearly, and the square pipe cleaning nozzle 2 moves to the front position along the bottom wall surface 62 of the square pipe 60.

  When the square pipe cleaning nozzle 2 reaches a predetermined position, the cleaning operator twists the hose 4 counterclockwise so that the first brush 50 is positioned in contact with the bottom wall surface 62. Then, the pressure of the high-pressure air 6 is increased to a predetermined pressure.

  The high-pressure air 6 introduced into the shaft portion 10 via the hose 4 is branched into the first discharge hole 11 and the second discharge hole 18 in the hollow portion 14. Since all of the first discharge high-pressure air 7 discharged from the four first discharge holes 11 is discharged obliquely rearward, the resultant is combined with the rearward high-pressure air discharge output. A forward force is generated as a reaction of the rear high-pressure air discharge output, and the forward force functions as a forward moving thrust that moves the square pipe cleaning nozzle 2 forward.

  Further, when the second discharge high-pressure air 8 discharged from the second discharge hole 18 is in the position of FIG. 5, the second discharge high-pressure air 8 is discharged obliquely to the upper right at an angle β. A diagonally downward left force is generated. The diagonally downward left force is divided into a leftward force and a vertically downward force. The leftward force functions as a leftward moving thrust that moves the square pipe cleaning nozzle 2 in the leftward direction. The vertical downward force presses the square pipe cleaning nozzle 2 downward against the bottom wall surface 62 of the square pipe 60, and this downward wall pressing force is a square shape with respect to the bottom wall surface 62 of the square pipe 60. It acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the bottom wall surface 62 increases.

  By such a leftward force and a vertically downward force, the square pipe cleaning nozzle 2 goes straight to the left and strikes the left wall surface 64 while scraping off the deposit 63 on the bottom wall surface 62 as shown in FIG. To temporarily stop. When the square pipe cleaning nozzle 2 collides with the left wall surface 64, the tip of the second brush 51 first contacts the left wall surface 64, but the second brush 51 is elastically deformed. Due to the elastic deformation of the second brush 51, the distal end portion 73 of the second rotation support member 71 appears and the distal end portion of the second rotation support member 71 collides with the left wall surface 64.

  The square pipe cleaning nozzle 2 makes the front end 72 of the first rotary support member 70 the center of rotation due to the reaction when the front end 73 of the second rotary support member 71 of the square pipe cleaning nozzle 2 collides with the left wall surface 64. Rotate clockwise at an angle of approximately 90 degrees. As a result, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the left wall surface 64.

  At this time, since the second discharge high-pressure air 8 is discharged obliquely downward and to the right at an angle β, a diagonally upward and upward force is generated as a reaction of the diagonally downward and high-pressure air discharge. The diagonally upward left force is divided into an upward force and a horizontal leftward force. The upward force functions as an upward movement thrust that moves the square pipe cleaning nozzle 2 upward. The horizontal left-facing force presses the square pipe cleaning nozzle 2 leftward against the left wall surface 64 of the square pipe 60, and this left-side wall pressing force is a square shape with respect to the left wall surface 64 of the square pipe 60. This acts to increase the sliding contact of the first brush 50 of the piping cleaning nozzle 2, and the cleaning force of the first brush 50 against the deposit 63 on the left wall surface 64 increases.

  Due to the upward force and the horizontal leftward force, the square pipe cleaning nozzle 2 moves straight upward and strikes the upper wall surface 66 while scraping off the deposit 63 on the left wall surface 64 as shown in FIG. To temporarily stop. When the square pipe cleaning nozzle 2 collides with the upper wall surface 66, the tip of the second brush 51 first contacts the upper wall surface 66, but the second brush 51 is elastically deformed. Due to the elastic deformation of the second brush 51, the distal end portion 73 of the second rotation support member 71 appears and the distal end portion of the second rotation support member 71 collides with the upper wall surface 66.

  The square pipe cleaning nozzle 2 makes the front end 72 of the first rotary support member 70 the center of rotation due to the reaction when the front end 73 of the second rotary support member 71 of the square pipe cleaning nozzle 2 collides with the upper wall surface 66. Rotate clockwise at an angle of approximately 90 degrees. As a result, the first brush 50 of the square pipe cleaning nozzle 2 comes into contact with the upper wall surface 66, and receives the vertical upward wall pressing force by the second released high-pressure air 8 released at an angle β obliquely downward to the left. However, the square pipe cleaning nozzle 2 moves to the right along the upper wall surface 66.

  Thereafter, as in the first embodiment described above, the square pipe cleaning nozzle 2 sequentially moves along the right wall surface 68 and the bottom wall surface 62, but extends from the upper wall surface 66 to the right wall surface 68 and to the right wall surface 68. When moving from the bottom wall surface 62 to the bottom wall surface 62, the first rotation support member 70 and the second rotation support member 71 automatically rotate clockwise at an angle of approximately 90 degrees.

  By repeating such a movement, the square pipe cleaning nozzle 2 performs a clockwise turning motion with respect to the square pipe 60 having a tetrahedral cross section.

  As in the first embodiment described above, if the clockwise turning movement of the square pipe cleaning nozzle 2 is repeated, the hose 4 is twisted and the clockwise turning movement cannot be continued. The clockwise turning motion of the nozzle 2 stops. Then, as in the first embodiment, in order to eliminate the twist of the hose 4, the cleaning operator appropriately twists the hose 4 counterclockwise with respect to the square pipe cleaning nozzle 2, whereby the second brush The square pipe cleaning nozzle 2 is positioned so that 51 is in contact with the inner wall surface 62, and the counterclockwise turning motion is performed following the stop of the clockwise turning motion. As a result of the clockwise and counterclockwise turning motions of the square pipe cleaning nozzle 2 being alternately repeated, the square pipe cleaning nozzle 2 is deposited on the bottom wall surface 61 of the square pipe 60. But it can be reliably removed and cleaned.

  In the above embodiment, the shaft portion 10 and the head cap portion 20 are constituted by two separate articles in order to facilitate replacement of the head cap portion 20. However, the present invention is not limited to the above-described embodiment, and the shaft portion 10 and the head cap portion 20 may be an article that is integrally configured by integral molding, machining, or the like. .

It is explanatory drawing of the cleaning nozzle for square piping which concerns on 1st embodiment of this invention. (A) is a plan view of the nozzle, (B) is an AA cross-sectional view of (A), (C) is a view of the nozzle as viewed from the front, and (D) is a nozzle of the hose. It is the rear view seen from the side. It is a figure explaining a mode that the cleaning nozzle for square piping shown in FIG. 1 cleans the inner wall surface of square piping, rotating clockwise. It is a figure explaining a mode that the cleaning nozzle for square piping shown in FIG. 1 cleans the inner wall surface of square piping, counterclockwise. It is explanatory drawing of the cleaning nozzle for square piping which concerns on 2nd embodiment of this invention. (A) is a plan view of the nozzle, (B) is an AA cross-sectional view of (A), (C) is a view of the nozzle as viewed from the front, and (D) is a nozzle of the hose. It is the rear view seen from the side. It is a figure which partially demonstrates a mode that the cleaning nozzle for square piping shown in FIG. 4 cleans the inner wall surface of square piping, rotating clockwise. It is a figure which partially demonstrates a mode that the cleaning nozzle for square piping shown in FIG. 4 cleans the inner wall surface of square piping, rotating clockwise. It is a figure which partially demonstrates a mode that the cleaning nozzle for square piping shown in FIG. 4 cleans the inner wall surface of square piping, rotating clockwise. It is the schematic explaining the whole structure of the in-pipe cleaning apparatus using the cleaning nozzle for square piping shown in FIG. It is explanatory drawing which shows the cleaning condition of the inner wall surface of the square piping by the piping cleaning nozzle shown in FIG.

Explanation of symbols

2: Cleaning nozzle for square piping 4: Hose 6: High pressure air 7: First discharge high pressure air 8: Second discharge high pressure air 10: Shaft portion 11: First discharge hole 12: Central portion 13: Hose attachment portion 14: Hollow Part 15: Protruding part 18: Second discharge hole 20: Head cap part 22: Base end part 23: Terminal part 24: Insertion hole 25: First inclined surface 26: Second inclined surface 28: Third surface 44: Screw 50 : First brush (shaving material)
51: Second brush (shaving member)
52: Third brush (buffer member)
60: Square piping 61: Inner wall surface 62: Bottom wall surface 63: Deposit 64: Left wall surface 66: Upper wall surface 68: Right wall surface 70: First rotation support member 71: Second rotation support member 72: Tip portion 73: Tip portion 150: In-pipe cleaning device 151: Outlet 154: Outdoor vehicle 155: Compressor 156: Suction pad 157: Suction hose 158: Collection tank 159: Dust collector 160: Filter 161: Extension cord 162: Generator α: First inclined surface Apex angle formed by the second inclined surface β: Angle formed by the injection force of the second high-pressure air released from the inner wall

Claims (8)

A square pipe cleaning nozzle for removing deposits adhering to a pipe having a square cross section,
A shaft part connected to the tip of the hose and having a hollow part for guiding high-pressure air from the hose inside;
A first inclined surface having a first scraping member, a second inclined surface having a second scraping member, a third inclined surface attached to the tip of the shaft portion and having a substantially triangular cross-sectional shape, A head cap portion having a third surface constituting the surface, and
The shaft portion is formed with a first discharge hole that communicates the hollow portion and the outer peripheral surface of the shaft portion and discharges high-pressure air in a substantially axial direction.
A second discharge hole that communicates the hollow portion and the outer peripheral surface of the shaft portion and discharges high-pressure air in the direction perpendicular to the axis is formed on the surface of the shaft portion corresponding to the third surface of the head cap portion. A cleaning nozzle for rectangular piping.   The rectangular nozzle cleaning nozzle according to claim 1, wherein the substantially triangular shape of the cross section is a substantially isosceles triangle in which the length of the first inclined surface and the length of the second inclined surface are substantially equal.   The square nozzle cleaning nozzle according to claim 2, wherein an apex angle formed by the first inclined surface and the second inclined surface is approximately 30 degrees to approximately 90 degrees.   The square nozzle cleaning nozzle according to claim 2, wherein an apex angle formed by the first inclined surface and the second inclined surface is approximately 60 degrees.   The square nozzle cleaning nozzle according to claim 1, further comprising a buffer member extending in a direction orthogonal to the third surface on the third surface side of the head cap portion.   The first inclined surface and the second inclined surface extend in a direction orthogonal to the first inclined surface and the second inclined surface, and are configured to be retracted from the tip of the scraping member. The square pipe cleaning nozzle according to claim 1, further comprising a rotation support member.   The square nozzle cleaning nozzle according to claim 6, wherein a distal end portion of the rotation support member is rounded. A cleaning nozzle for rectangular piping according to any one of claims 1 to 7,
A hose to which a square pipe cleaning nozzle is attached;
High-pressure air supply means for supplying high-pressure air into the hose;
A square pipe cleaning device comprising: dust collecting means for sucking and collecting dust in the pipe.

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