Water jet attachment

Abstract

To provide an attachment for a waterjet that facilitates work in external corners.SOLUTION: An attachment 1 for a waterjet comprises: a nozzle 7; a cover 3 having an edge 3D that covers a discharge port 7A of the nozzle 7 to form a planar opening 3E; and a shield 10 that partially blocks the planar opening 3E. Preferably, the attachment 1 comprises a guide 11. The guide 11 has a guide surface 11A passing through an edge 10A of a shield 10 and extending perpendicular to an opening plane of the planar opening 3E. Preferably, the attachment 1 comprises three or more pressing members positioned enclosing the planar opening 3E. When the edge 3D of the cover 3 abuts onto a wall surface, the three or more pressing members abut onto the wall surface.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a water jet attachment for use on outside corners of a structure. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2005-105753 discloses a water jet attachment having a curved opening. This attachment is used for cleaning, stripping, chipping, and other work on the corners of structures. This attachment can work on the corners by aligning the curved opening along the corner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-105753 A Summary of the Invention [Problem to be solved by the invention]

[0004] In water jet cleaning, stripping, chipping, and other operations, high-pressure water, for example, 200 MPa, is sprayed toward a wall surface. The worker holds the attachment that sprays the high-pressure water against the wall surface. The attachment with the aforementioned curved opening is pressed against one wall surface of the corner. While the curved opening of this attachment is pressed against one wall surface of the corner, it is then pressed against the other wall surface. The worker must move the attachment along the corner while pressing the curved opening against one wall surface and then against the other wall surface. This type of work is not easy for the worker.

[0005] The applicant's intention is to provide a water jet attachment that makes it easy to work around corners. [Means for solving the problem]

[0006] The present specification discloses a water jet attachment comprising: A water jet nozzle, a cover that covers the nozzle outlet and has an edge that forms a planar opening; a shield that blocks a portion of the planar opening; Equipped with. [Effects of the Invention]

[0007] This water jet attachment makes it easy to work around corners. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a top view of an attachment according to one embodiment. [Figure 2] 2 is a rear view of the attachment of FIG. 1, shown partially in cross section along line II-II of FIG. [Figure 3] FIG. 3 is a bottom view of the attachment of FIG. [Figure 4] FIG. 4 is a side view of the attachment of FIG. [Figure 5] FIG. 5 is an explanatory diagram showing the attachment of FIG. 1 in use. [Figure 6] FIG. 6 is an explanatory diagram showing the positional relationship between the opening of the attachment, the shield, and the pressing tool when the usage state of FIG. 5 is viewed from the bottom. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0010] The attachment 1 shown in Fig. 1 is used to spray high-pressure water toward the wall surface of a structure and perform tasks such as cleaning, peeling, and chipping of the wall surface. The left-right direction in Fig. 1 is the left-right direction of the attachment 1, the up-down direction in Fig. 1 is the front-rear direction of the attachment 1, and the direction perpendicular to the plane of Fig. 1 is the up-down direction of the attachment 1. Fig. 2 is a view of the attachment 1 from the rear. In Fig. 2, the cover 3 is shown in cross section along line II-II in Fig. 1. Fig. 3 is a view of the attachment 1 from below.

[0011] As shown in FIG. 1, the attachment 1 comprises a main body 2, a cover 3 attached to the bottom of the main body 2, a handle 4 attached to the top of the main body 2, a plurality of ball rollers 5 as pressing devices positioned around the cover 3, and a plurality of supports 6 as mounting devices positioned around the main body 2.

[0012] The main body 2 has a supply port 2A to which a high-pressure water supply hose is connected, and a discharge port 2B to which a drain hose is connected. The pressure of the high-pressure water is not particularly limited, but is, for example, 100 MPa or more and 250 MPa or less. The supply port 2A is located at the top of the main body 2, and the discharge port 2B is located at the rear of the main body 2. As shown in FIG. 3 , the discharge port 2B has an opening 2C that opens to the inner surface at the rear of the cover 3.

[0013] As shown in FIG. 2, the cover 3 has a cover body 3A and a brush 3B. The brush 3B extends downward from the lower end of the cover body 3A. As shown in FIG. 3, the cover body 3A and the brush 3B form a circular ring-shaped peripheral wall 3C (see FIG. 2), and the brush 3B forms an edge 3D of the cover 3. The brush 3B forms an opening 3E, which is a circular planar opening. Note that the edge 3D is not limited to the brush 3B. For example, the cover 3 may not have the brush 3B, and the edge 3D may be the lower end of the cover body 3A.

[0014] As shown in FIG. 3, in the attachment 1, four ball rollers 5 are positioned around the cover 3. The ball rollers 5 are located at four locations: the front left and right and the rear left and right. Each ball roller 5 has a ball 5A and a retainer 5B for the ball 5A. The retainer 5B holds the ball 5A. The ball 5A can rotate in either direction around its center. As shown in FIG. 1, the retainer 5B is attached to the main body 2. Note that the number of ball rollers 5 is not limited to four.

[0015] As shown in FIG. 1, the attachment 1 includes a shield holder 9 attached to a support 6. The shield holder 9 is attached to the support 6 with screws. The attachment 1 includes a support 6 located on the left side of the main body 2, a support 6 located on the right side, and a support 6 located on the front. The shield holder 9 can be attached to and detached from any of the three supports 6. The number of supports 6 is not limited to three.

[0016] As shown in FIG. 2, the attachment 1 includes six water jet nozzles 7 and a nozzle holder 8 to which the nozzles 7 are attached. The nozzles 7 and nozzle holder 8 are located within the cover 3. As shown in FIGS. 2 and 3, the nozzles 7 and nozzle holder 8 are covered by the cover 3. The outlets 7A of the nozzles 7 are covered by the cover 3. Each nozzle 7 is connected to a supply port 2A. The outlets 7A of each nozzle 7 face downward. The number of nozzles 7 is not limited to six. The number of nozzles 7 may be one, or two or more.

[0017] The nozzle holder 8 is attached to the main body 2. The nozzle holder 8 is rotatable around an axis 8A. The nozzle 7 is rotatable together with the nozzle holder 8. Note that the nozzle holder 8 does not have to be rotatable. The nozzle holder 8 may be fixed to the main body 2.

[0018] The attachment 1 includes a shield 10, a guide 11, a liquid-proof cover 12, and an adjuster 13 for the liquid-proof cover 12, which are attached to a shield holder 9. The shield 10, the guide 11, the liquid-proof cover 12, and the adjuster 13 are detachable from the support 6 together with the shield holder 9.

[0019] The shield 10 is fixed to the shield holder 9. An edge 10A of the shield 10 crosses the opening 3E of the cover 3. The shield 10 blocks a portion of the opening 3E of the cover 3. The shape of the shield 10 is a plate, but is not limited to this. As shown in FIG. 2 , the shield 10 has a shield surface 10B, and the shield surface 10B abuts against the brush 3B (edge ​​3D) of the cover 3. The shield 10 only needs to have an edge 10A that extends linearly across the opening 3E and a shield surface 10B that blocks a portion of the opening 3E.

[0020] The guide 11 has a guide surface 11A that passes through the edge 10A of the shield 10 and is perpendicular to the opening plane formed by the opening 3E. The guide surface 11A extends in a direction away from the opening 3E. The guide 11 may be integral with the shield 10. The guide 11 and the shield 10 may be integrally formed from an angle iron, a channel iron, or the like.

[0021] The liquid-proof cover 12 extends along the guide 11 in a direction away from the opening 3E of the cover 3. The liquid-proof cover 12 is made of an elastically deformable plate-shaped material. The liquid-proof cover 12 is made of, for example, a rubber plate.

[0022] The adjuster 13 has a pusher 13A that contacts the liquid-proof cover 12 and a screw 13B that changes the position of the pusher 13A relative to the guide 11. The adjuster 13 can change the position of the pusher 13A when the screw 13B is screwed into the guide 11. The pusher 13A can be pressed against the liquid-proof cover 12.

[0023] As shown in Figure 2, the attachment 1 is equipped with left and right levers 14. The right lever 14 is attached to the right grip of the handle 4. The left lever 14 is attached to the left grip of the handle 4. Figure 4 is a view of the attachment 1 as seen from the right. As shown in Figure 4, the right lever 14 is rotatable relative to the handle 4. Like the right lever 14, the left lever 14 is also rotatable relative to the handle 4. Although not shown, the attachment 1 is equipped with rotation stoppers on each of the left and right levers 14 as safety devices.

[0024] Although not shown, the attachment 1 has a pneumatic circuit. The pneumatic circuit has a first valve that opens and closes the pneumatic circuit when the right lever 14 is rotated, and a second valve that opens and closes the pneumatic circuit when the left lever 14 is rotated. This pneumatic circuit can switch a switching valve that supplies high-pressure water to the supply hose by opening and closing the first and second valves. For example, by opening the first and second valves, the switching valve can supply high-pressure water to the supply hose, and by closing the first and second valves, the switching valve can supply high-pressure water to another flow path without supplying high-pressure water to the supply hose.

[0025] Figure 5 shows the attachment 1 in use. The first wall surface 15 and the second wall surface 16 are each flat wall surfaces. The first wall surface 15 and the second wall surface 16 are perpendicular to each other. Figure 5 also shows a corner 17 formed where the first wall surface 15 and the second wall surface 16 meet. The corner 17 extends in the vertical direction. The attachment 1 is pressed against the first wall surface 15 with its front-to-rear direction aligned with the vertical direction of the first wall surface 15. Figure 5 shows the state of the attachment 1 pressed against the first wall surface 15 as viewed from below the first wall surface 15.

[0026] The brush 3B (edge ​​3D) of the cover 3 abuts against the first wall surface 15. The balls 5A of each ball roller 5 abut against the first wall surface 15. The guide surface 11A of the guide 11 abuts against the second wall surface 16. The edge 10A of the shield 10 abuts against the corner 17. The shield surface 10B is located in approximately the same plane as the first wall surface 15.

[0027] The screw 13B of the adjuster 13 is screwed into the guide 11. The screw 13B causes the pusher 13A to press the liquid-proof cover 12 against the second wall surface 16. The tip 12A of the liquid-proof cover 12 is inclined. The inclination angle θ of the tip 12A of the liquid-proof cover 12 can be adjusted by this screw 13B.

[0028] Figure 6 shows the positional relationship between the opening 3E of the cover 3, the shield 10, and the balls 5A. Figure 6 shows the positional relationship when the state of use shown in Figure 5 is viewed from the first wall surface 15 side. The two-dot chain line LS in Figure 6 represents the edge 10A of the shield 10 that crosses the opening 3E. The two-dot chain line LW represents the edge of the first wall surface 15. The two-dot chain line LW also represents the position of the outside corner 17. Each ball 5A abuts against the first wall surface 15 at an abutment point 5P. The two-dot chain line LB represents an imaginary line that connects the abutment points 5P of adjacent ball rollers 5 along the edge 10A of the shield 10. The imaginary line LB is located closer to the center of the opening 3E than the edge 10A of the shield 10.

[0029] Here, a chipping operation will be described using this attachment 1. Here, compressed air is supplied to the pneumatic circuit of the attachment 1. A supply hose is connected to the supply port 2A. A drain hose is connected to the discharge port 2B.

[0030] The worker grasps the left and right grips of the handle 4 with their hands. The worker holds the attachment 1 with the discharge outlet 2B facing downwards and the opening 3E facing forward. The worker brings the attachment 1 into contact with the first wall surface 15 near the corner 17. The worker positions the edge 10A of the shield 10 at the corner 17. The worker moves the attachment 1 to a position where the guide 11 and the second wall surface 16 come into contact.

[0031] The worker presses the ball 5A and the brush 3B of the cover 3 against the first wall surface 15. At this time, the worker checks that the liquid-proof cover 12 is properly abutting against the second wall surface 16. If necessary, the worker operates the adjuster 13 to properly abut the liquid-proof cover 12 against the second wall surface 16.

[0032] While gripping the handle 4, the operator releases the rotation stopper and rotates the left and right levers 14. The high-pressure water selector valve is switched, and high-pressure water flows into the supply hose. High-pressure water is supplied to the attachment 1. High-pressure water is sprayed from the outlet 7A of the nozzle 7, and the nozzle holder 8 rotates. The nozzle 7 sprays high-pressure water while rotating together with the nozzle holder 8. This high-pressure water chips the first wall surface 15.

[0033] The worker moves the attachment 1 along the protruding corner 17 while pressing it against the first wall surface 15. As a result, the first wall surface 15 is chipped along the protruding corner 17. The wastewater containing the chipped pieces is discharged from the discharge port 2B. The wastewater containing the chipped pieces is sent to a treatment device, where the chipped pieces and the wastewater are separated. The separated chipped pieces and the wastewater are each subjected to the necessary treatment.

[0034] This attachment 1 has a cover 3 that covers the discharge port 7A of the nozzle 7. This attachment 1 prevents chipping chips and wastewater from scattering. This attachment 1 can reduce the amount of equipment required by the worker, even when chipping the first wall surface 15 that contains harmful substances such as asbestos. By reducing the amount of equipment required, this attachment 1 can reduce the workload of the worker.

[0035] The attachment 1 includes a cover 3 having an edge 3D that forms an opening 3E. The opening 3E is a flat opening, which allows the worker to press the attachment 1 in one direction toward the first wall surface 15 to perform work.

[0036] This attachment 1 is provided with a shield 10 that closes a portion of the opening 3E. By providing the shield 10, the worker can perform chipping work on the first wall surface 15 up to the protruding corner 17. This attachment 1 can easily perform chipping work at the protruding corner 17 while having the opening 3E, which is a flat opening.

[0037] The attachment 1 includes a guide 11. The guide 11 has a guide surface 11A that passes through the edge 10A of the shield 10 and extends perpendicular to the opening plane of the opening 3E. By abutting this guide surface 11A against the second wall surface 16, the worker can easily align the edge 10A of the shield 10 with the protruding corner 17. The worker can easily perform the chipping work on the first wall surface 15 while moving the attachment 1 along the protruding corner 17. Note that the guide surface 11A is not limited to a flat surface. It is sufficient that the guide surface 11A can align the edge 10A of the shield 10 with the protruding corner 17. For example, the guide surface 11A may be made up of two or more curved surfaces, and the two or more curved surfaces may abut against the second wall surface 16.

[0038] This attachment 1 includes four ball rollers 5 positioned around the opening 3E. By bringing the four ball rollers 5 into contact with the first wall surface 15, the attachment 1 is pressed stably against the first wall surface 15. From the viewpoint of being pressed stably against the first wall surface 15, the number of ball rollers 5 may be three or more. These ball rollers 5 are an example of a pressing tool for the first wall surface 15, and the number of ball rollers 5 is not limited to this.

[0039] In this attachment 1, when the edge 3D of the cover 3 abuts against the first wall surface 15, the four ball rollers 5 abut against the first wall surface 15. This prevents chipping chips and drainage water from leaking from the edge 3D of the cover 3.

[0040] 6, an imaginary line LB connecting the contact points 5P of adjacent ball rollers 5 along the edge 10A of the shield 10 is closer to the center of the opening 3E than the edge 10A of the shield 10. This attachment 1 positions the edge 10A of the shield 10 at the protruding corner 17, allowing the ball rollers 5 to contact the first wall surface 15.

[0041] This attachment 1 includes a support 6 to which a shield 10 can be attached and detached. This attachment 1 can be used to clean, peel, chip, etc. the flat first wall surface 15 and second wall surface 16 by removing the shield holder 9. This attachment 1 can be used to clean, peel, chip, etc. the projected corner 17 by attaching the shield holder 9. This attachment 1 can be used on both the flat first wall surface 15 and second wall surface 16 and the projected corner 17.

[0042] This attachment 1 includes three supports 6. Each support 6 has a different portion of the opening 3E that is covered by the attached shield 10. With this attachment 1, the support 6 to which the shield 10 is attached can be selected according to the position of the external corner 17.

[0043] This attachment 1 includes a liquid-proof cover 12 that extends along the edge 10A of the shield 10 in a direction away from the opening 3E, and an adjuster 13 that can change the intersection angle between the tip 12A of the liquid-proof cover 12 and the opening 3E. By including the liquid-proof cover 12, the attachment 1 can further suppress leakage from between the shield 10 and the external corner 17. In addition, the attachment 1 can use the adjuster 13 to adjust the degree of pressing of the liquid-proof cover 12 against the second wall surface 16.

[0044] [Disclosure items] Each of the following sections discloses a preferred embodiment.

[0045] [Item 1] A water jet nozzle, a cover that covers the nozzle outlet and has an edge that forms a planar opening; a shield that blocks a portion of the planar opening; A water jet attachment comprising:

[0046] [Item 2] Equipped with a guide, Item 2. The attachment for a water jet according to item 1, wherein the guide has a guide surface that passes through the edge of the shield and extends perpendicular to the opening plane of the planar opening.

[0047] [Item 3] Three or more pressing tools are provided, the pressing tools being positioned around the planar opening; 3. The attachment for a water jet according to item 1 or 2, wherein when the edge of the cover abuts against a wall surface, the three or more pressing tools abut against the wall surface.

[0048] [Item 4] Item 4. The water jet attachment according to item 3, wherein an imaginary line connecting the contact points of adjacent pressing tools along the edge of the shield is closer to the center of the planar opening than the edge of the shield.

[0049] [Item 5] 5. The attachment for a water jet according to any one of items 1 to 4, comprising a mounting fixture to which the shield can be detachably attached.

[0050] [Item 6] A plurality of the mounting fixtures are provided, 6. The water jet attachment of claim 5, wherein each of the mounting fixtures has a different portion of the planar opening that is covered by the attached shield.

[0051] [Item 7] a liquid-proof cover extending along an edge of the shield in a direction away from the planar opening; an adjuster that can change the intersection angle between the liquid-proof cover and the plane opening; 7. The water jet attachment according to any one of items 1 to 6, further comprising: [Explanation of symbols]

[0052] 3. Cover 3D...edge 3E...Aperture (plane aperture) 5. Ball roller (pressing tool) 5P...contact point 6. Support (mounting fixture) 7 Nozzle 7A...Discharge port 10. Shield 10A···Edge 11 Guide 11A Guide surface 12 Liquid-proof cover 13...Adjuster 15, 16...wall 17. Outside corner LB: Imaginary line

Claims

1. A water jet nozzle, a cover that covers the nozzle outlet and has an edge that forms a planar opening; a shield that covers a portion of the planar opening; a liquid-proof cover extending along an edge of the shield in a direction away from the planar opening; an adjuster that can change the intersection angle between the liquid-proof cover and the plane opening; A water jet attachment comprising:

2. Equipped with a guide, 2. The water jet attachment of claim 1, wherein the guide has a guide surface that extends through an edge of the shield and perpendicular to the plane of the planar opening.

3. three or more pressing tools positioned around the planar opening; 3. The water jet attachment according to claim 1, wherein the three or more pressing tools come into contact with the wall surface when the edge of the cover comes into contact with the wall surface.

4. 4. The water jet attachment according to claim 3, wherein an imaginary line connecting the contact points of adjacent pressing tools along the edge of the shield is closer to the center of the planar opening than the edge of the shield.

5. 3. The attachment for a water jet according to claim 1, further comprising a mounting fixture to which the shield can be detachably attached.

6. A plurality of the mounting fixtures are provided, 6. The water jet attachment of claim 5, wherein each of the fittings has a different portion of the planar opening that is covered by the attached shield.

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