JP5358232B2 - Water jet equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water jet device in which large vibration or noise influencing a surrounding living environment is prevented from being generated, and high-pressure water, polishing agent or the like is prevented from scattering so as not to deteriorate working conditions. <P>SOLUTION: The water jet device is provided with: a pump unit having a pump for generating the high-pressure water; a motor unit having a motor for rotating the pump; and a nozzle unit 45 having a nozzle for jetting the high-pressure water generated by the pump. The nozzle unit 45 is provided with a nozzle guide 61 to form a closed space between an object and the nozzle guide 61, and the nozzle 80 is mounted to the nozzle guide 61 so that a jet orifice of the nozzle 80 is opened in the closed space. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a water jet device, and more particularly, to a water jet device effective for removing a surface layer portion of a frame of a concrete structure, for example, in renewal work such as seismic reinforcement of an existing concrete structure.

  When renewal work such as seismic reinforcement for an existing concrete structure, remove the surface layer (finished mortar layer, etc.) laminated on the upper part of the base layer of the frame, and then perform repairs for seismic reinforcement, etc. We are doing renovation work.

  In such renewal work, the surface layer was conventionally removed using an electric pitching machine, a high-speed rotary cutter device, etc., but the surrounding living environment is affected by vibration and noise generated during the work. In recent years, various water jet devices that suppress generation of vibration and noise have been used.

  For example, as described in Non-Patent Documents 1 and 2, the water jet device is generated by a pump unit having a high-pressure pump that generates high-pressure water, a motor unit having a motor that rotates the high-pressure pump, and a high-pressure pump. A nozzle unit having a nozzle for injecting high-pressure water, an abrasive supply unit for supplying abrasive to the nozzle, and the like, and injecting high-pressure water generated by the high-pressure pump of the pump unit from the nozzle together with the abrasive from the abrasive supply unit By doing so, the surface layer part of the housing can be removed from the upper part of the base layer part.

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  By the way, in the water jet apparatus having the above-described configuration, a large vibration or noise is not generated as in an electric pitching machine or a high-speed rotary cutter apparatus, but it does not affect the surrounding living environment. Vibration and noise cannot be suppressed. In addition, there is a problem that high-pressure water, abrasives, and the like used when removing the surface layer portion of the concrete structure frame are scattered around, deteriorating the working environment.

  The present invention has been made in view of the conventional problems as described above, and does not generate large vibrations and noises that affect the surrounding living environment. It is an object of the present invention to provide a water jet device that does not cause the working environment to deteriorate due to splashing around.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention includes a pump unit having a pump for generating high-pressure water, a motor unit having a motor for rotating the pump, and a nozzle unit having a nozzle for injecting high-pressure water generated by the pump. In the water jet device, the nozzle unit includes a nozzle guide that forms a closed space between the nozzle unit and an object. When the nozzle guide closes an annular peripheral plate and an upper end opening of the peripheral plate, A guide body made of a plate, provided at a lower end opening of the guide body, an annular seal member for sealing between the object, a substantially central portion of the top plate, A partition member that is in contact with an object and divides the closed space into a first space and a second space in which only peripheral portions communicate with each other; A portion corresponding to one space is provided with a nozzle hole through which the nozzle is inserted, and a recovery hole for connecting a recovery hose for recovering high-pressure water sprayed from the nozzle from within the closed space. The portion corresponding to the second space is provided with an outside air intake hole for taking in outside air into the closed space .

According to the water jet device of the present invention, a closed space is formed between the object by the guide body of the nozzle guide and the seal member, and only the peripheral portion communicates with the inside of the closed space by the partition member of the nozzle guide. A nozzle hole through which the nozzle is inserted and a recovery hole for connecting the recovery hose are provided in a portion corresponding to the first space of the top plate of the nozzle guide, which is partitioned into a first space and a second space. Since the outside air intake hole is provided in the portion corresponding to the second space of the plate, the vibration generated when the object is cut by jetting high pressure water from the nozzle or the groove or the like is formed in the object. Noise can be prevented from leaking out of the closed space. Moreover, it is possible to prevent the used high-pressure water from leaking out of the closed space and splashing around. Moreover, the sound and vibration at the time of injecting high pressure water from a nozzle can be attenuated by a partition member. Further, since the high-pressure water sprayed from the nozzle is recovered from the first space through the recovery hose after cutting the object, the high-pressure water flows from the first space into the second space. Thus, it does not leak out of the closed space from the outside air intake hole and scatter around. Further, since the outside air can be taken into the closed space from the outside air taking hole through the second space, the pressure difference inside and outside the closed space can be adjusted .

In the present invention, an adjustment plate for adjusting an opening area of the outside air intake hole may be provided at a portion of the top plate corresponding to the outside air intake hole .

According to the water jet device of the present invention, the amount of outside air taken into the closed space can be adjusted by adjusting the opening area of the outside air taking-in hole with the adjusting plate .

  In the present invention, the nozzle guide may be movably supported by a guide means.

  According to the water jet device of the present invention, the nozzle can be moved integrally with the nozzle guide by moving the nozzle guide through the guide means, and the object can be cut according to the movement trajectory of the nozzle, A groove or the like can be formed in the object.

  Furthermore, in the present invention, the guide means may include a guide rail and a slider movable along the guide rail, and the nozzle guide may be attached to the slider.

  According to the water jet device of the present invention, by moving the slider along the guide rail, the nozzle guide and the nozzle move together with the slider, and the object is cut according to the movement trajectory of the nozzle. A groove or the like can be formed on the surface.

As described above, according to the water jet device of the present invention, it is possible to prevent the vibration and noise generated when the high pressure water is jetted from the nozzle to form a groove or the like in the object and leak out of the closed space. . In addition, it is possible to prevent the used high-pressure water or the like from leaking out of the closed space and scattering to the surroundings, thereby preventing the working environment from deteriorating. Moreover, since the pressure difference inside and outside the closed space can be adjusted, it is possible to prevent the movement of the nozzle from being hindered by the pressure difference.

1 is a schematic plan view showing an entire embodiment of a water jet device according to the present invention. It is a front view of FIG. It is a top view of a nozzle unit. FIG. 4 is a front view of FIG. 3. FIG. 4 is a left side view of FIG. 3. FIG. 4 is a detailed view of the nozzle of FIG. 3. It is the elements on larger scale seen from the A direction of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The water jet device 1 according to the present embodiment is applied when renewal work such as seismic reinforcement is applied to an existing concrete structure, and removes a surface layer portion (finished mortar layer, etc.) laminated on the upper part of the base layer portion of the frame. The pump unit 2 having a high-pressure pump 6 for generating high-pressure water as shown in FIG. 1 and FIG. A motor unit 10 having a motor 14 for rotating the high-pressure pump 6 of the pump unit 2 and a nozzle unit 45 having a nozzle 80 for injecting high-pressure water generated by the high-pressure pump 6 of the pump unit 2 are provided.

  As shown in FIGS. 1 and 2, the pump unit 2 includes a high pressure pump 6 mounted on an upper portion of a cart (hereinafter referred to as a first cart 3) and a high pressure pump 6 mounted on an upper portion of the first cart 3. Peripheral devices (a backup pump, a filter, a pressure regulating valve, and the like), which are separably connected to a motor unit 150, which will be described later, via a connecting means 20.

  The first bogie 3 has a quadrangular shape in which a pair of vertical frames and a pair of horizontal frames made of a steel material such as C-shaped steel are framed in four directions, and the adjacent vertical frames and the horizontal frames are integrally connected by welding or the like. The base frame (hereinafter referred to as the first base frame 4) formed on the first base frame 4 and casters 5 provided at the lower four corners of the first base frame 4 are provided on the left side of FIG. The second base frame 12 of the second carriage 11 of the motor unit 10 to be connected is connected via the connecting means 20.

  In addition, an adjustment bolt (not shown) is provided in a portion adjacent to each caster 5 below the first base frame 4 of the first carriage 3 so that the level of the first base frame 4 can be adjusted by the adjustment bolt. It may be configured. Further, a handle for hand pressing (not shown) may be provided on the upper portion of the first base frame 4.

  The high pressure pump 6 is, for example, a plunger type pump. In the present embodiment, the triple plunger type high pressure pump 6 (rated rotational speed: 180 revolutions, plunger diameter: 10 mm, stroke; 65. 6 mm, rated pressure; 200 MPa, flow rate: 2.5 L / min, manufactured by Maruyama Excel Co., Ltd.). The high-pressure pump 6 is formed in a size that fits in the upper part of the first base frame 4 of the first carriage 3.

  The first base frame 4 is provided with a cover (not shown) so as to cover the periphery of the input shaft 8 of the high-pressure pump 6. The input shaft 8 and a connecting means 20 to be described later connected to the input shaft 8 by this cover. The periphery of the first joint portion 22 of the universal joint 21 is covered. Moreover, the inside of the cover is comprised so that accommodation of the connection bush 33 of the connection mechanism 32 mentioned later connected with the 1st coupling part 22 is possible.

  As shown in FIGS. 1 and 2, the motor unit 10 includes a motor 14 mounted on an upper portion of a carriage (hereinafter referred to as a second carriage 11), wiring, piping, and the like mounted on the upper portion of the second carriage 11. And is connected to the above-described pump unit 2 through the connecting means 20 in a separable manner.

  The second bogie 11 has a rectangular shape in which a pair of vertical frames made of steel material such as C-shaped steel and a pair of horizontal frames are framed in a four-way manner, and the adjacent vertical frames and the horizontal frames are integrally connected by welding or the like. 1 and the casters 13 provided at the lower four corners of the second base frame 12, and the right side surface of the second base frame 12 in FIG. The first base frame 4 of the unit 2 is connected to the left side surface of FIG.

  An adjustment bolt (not shown) is provided in a portion adjacent to each caster 13 below the second base frame 12 of the second carriage 11 so that the level of the second base frame 12 can be adjusted by the adjustment bolt. It may be configured. Further, a handle (not shown) for pushing the hand may be provided on a part of the second base frame 12.

  The motor 14 is, for example, a geared motor. In the present embodiment, a geared motor having an output of 15 kW, a rated rotation speed of 180 rotations, and a reduction ratio of 1/10 is used. The motor 14 has a size that fits in the upper part of the second base frame 12.

  A cover (not shown) is provided on the upper portion of the second base frame 12 so as to cover the periphery of the output shaft 15 of the motor 14, and the output shaft 15 and the connecting means described later connected to the output shaft 15 by this cover. The circumference of the second joint portion 27 of the 20 universal joints 21 is covered. Moreover, the inside of a cover is comprised so that accommodation of the connection shaft 34 of the connection mechanism 32 connected with the 2nd coupling part 27 mentioned later is possible.

  The connecting means 20 includes a universal joint 21 that detachably connects the input shaft 8 of the high-pressure pump 6 of the pump unit 2 and the output shaft 15 of the motor 14 of the motor unit 10, the first carriage 3 of the pump unit 2, and the motor unit. 10 is connected to the second carriage 11 in a detachable manner, and includes a fixing member 40 that fixes the input shaft 8 of the high-pressure pump 6 and the output shaft 15 of the motor 14 to each other via the universal joint 21. Yes.

  The universal joint 21 includes a bendable first joint portion 22 connected to the input shaft 8 of the high-pressure pump 6 of the pump unit 2 and a bendable second joint connected to the output shaft 15 of the motor 14 of the motor unit 10. And a connecting mechanism 32 that connects the first joint part 22 and the second joint part 27 in a detachable manner.

  The connection mechanism 32 includes a connection bush 33 provided on the first joint portion 22 and a connection shaft 34 provided on the second joint portion 27 and capable of fitting with the connection bush 33.

The connecting bush 33 has an inner surface formed in a polygonal shape, an elliptical shape, etc., and an outer surface of the connecting shaft 34 is formed in a polygonal shape, an elliptical shape, or the like that matches the inner surface of the connecting bushing 33. Rotation is prevented.
In addition, the inner surface of the connection bush 33 and the outer surface of the connection shaft 34 are not limited to the shape described above, and may be any shape that can prevent the relative rotation of both. In addition, the inner surface of the connecting bush 33 may be formed in a circular shape, and the outer surface of the connecting shaft 34 may be formed in a shape matching the inner surface. What is necessary is just to comprise so that general rotation may be prevented.

  By fitting the connecting bush 33 on the first joint portion 22 side and the connecting shaft 34 on the second joint portion 27 side together, the first joint portion 22 and the second joint portion 27 are connected via the connecting mechanism 32. The input shaft 8 of the high-pressure pump 6 and the output shaft 15 of the motor 14 are connected to each other via a universal joint 21.

  The fixing member 40 has a left side surface in FIG. 1 of the first base frame 4 of the pump unit 2 and a second base frame of the motor unit 10 so as to sandwich the input shaft 8 of the high-pressure pump 6 and the output shaft 15 of the motor 14 from both sides. 12 is provided between the right side surface of FIG. 1 and the first base frame 4 of the pump unit 2 and the second base frame 12 of the motor unit 10 are connected to each other via the pair of fixing members 40, 40. It has come to be.

  The fixing member 40 has, for example, a box shape in which an upper portion formed by combining C-shaped steel, flat steel, or the like is open, and one end in the longitudinal direction is a second base frame of the motor unit 10 via a hinge 41. 12 is connected to the right part of FIG. The fixing member 40 is pivoted upward via a hinge 41 in a state in which both ends are separated from the first base frame 4 of the pump unit 2 and the second base frame 12 of the motor unit 10. It is housed on the two-carriage 11 side.

  The fixing member 40 is interposed between the left side surface of the first base frame 4 of the pump unit 2 in FIG. 1 and the right side surface of the second base frame 12 of the motor unit 10 in FIG. A bolt is inserted between the through hole and the screw insertion hole of the first base frame 4 of the pump unit 2, and the screw insertion hole of the other end in the longitudinal direction and the screw insertion of the second base frame 12 of the motor unit 10 are inserted. Bolts are inserted between the holes, and nuts are fastened to the respective bolts via washers, so that the first base frame 4 of the pump unit 2 and the second base frame 12 of the motor unit 10 are integrally connected to each other. The input shaft 8 of the pump 6 and the output shaft 15 of the motor 14 are fixed to each other via a universal joint 21.

  As shown in FIGS. 3 to 5, the nozzle unit 40 includes guide means 46, a nozzle guide 61 movably supported by the guide means 46, and a nozzle 80 that can move integrally with the nozzle guide 61. Yes.

  The guide means 46 includes a guide rail 47, a slider 51 that can move along the guide rail 47, and a drive source 56 that moves the slider 51 along the guide rail 47, and a nozzle guide 61 is provided on the slider 51. ing.

  The guide rail 47 includes a rectangular lower plate 48, a pair of rectangular side plates 49, 49 erected integrally with a space above the lower plate 48, and a lower plate 48 above each side plate 49. It is composed of a rectangular upper plate 50 that is integrally provided so as to be parallel and end portions project outward from the outer surface of each side plate 49.

  The slider 51 includes a moving plate 52 movably provided above the upper plates 50, 50 of the guide rail 47, and a pair of side plates 53, 53 provided in a suspended state at both ends on the lower surface side of the moving plate 52. The moving plate 52 includes a pair of first rollers 59 and 59 provided at the center on the lower surface side, and a pair of second rollers 60 and 60 provided on the inner surface of each side plate 53.

  In the slider 51, a pair of first rollers 59, 59 are interposed between the inner surfaces of both side plates 49, 49 of the guide rail 47, and each pair of second rollers 60, 60 is a lower surface of each upper plate 50 and a lower plate 48. Thus, the guide rail 47 is configured to be movable in the longitudinal direction.

  A first attachment portion 54 is provided on the outer surface of the left side plate 53 of the slider 51 in FIG. 5, and a stepping motor 56 as a drive source is attached to the first attachment portion 54, and a pinion gear is attached to the drive shaft of the stepping motor 56. 57 is attached. The pinion gear 57 meshes with a rack 58 provided at an end portion on the upper surface side of the lower plate 48 of the guide rail 47. The slider 51 is moved in the longitudinal direction of the guide rail 47 by driving the stepping motor 56 and rotating the pinion gear 57.

  A second mounting portion 55 is provided on the outer surface of the side plate 53 on the right side of the styler 51 in FIG. 5, and a nozzle guide 61 and a nozzle 80 are mounted on the second mounting portion 55, and the length of the guide rail 47 is integrated with the slider 51. It is designed to move in the direction.

  The nozzle guide 61 includes a guide main body 62 including an annular peripheral plate 63, a top plate 64 that closes the upper end opening of the peripheral plate 63, and an annular seal member 71 attached to the lower end opening of the guide main body 62. The top plate 64 of the guide main body 62 is fixed to the second mounting portion 55 with a bolt, so that it can be attached to the second mounting portion 55.

  The seal member 71 is made of an elastic material such as rubber, and the lower end of the guide body 62 is opened by fitting the lower end of the peripheral plate 63 of the guide body 62 into a mounting groove provided at the base end. Can be attached to the part.

  As shown in FIG. 7, the distal end portion of the seal member 71 is curved inward of the guide main body 62 (inward of the peripheral plate 63), and this curved distal end portion is brought into contact with the surface of the surface layer portion of the housing. Thus, the space between the surface of the surface layer portion is sealed, and a closed space 75 is formed inside the nozzle guide 61.

  As shown in FIG. 3, the top plate 64 of the guide body 62 has a nozzle hole 65 through which a nozzle 80 described later is inserted into the closed space 75, and a collection hole for recovering high-pressure water, abrasives, and the like from the closed space 75. 66, and one end of a recovery hose 67 is connected to the recovery hole 66 via a hose joint.

As shown in FIGS. 5 and 6, the nozzle 80 includes a nozzle body 81 that is attached to the second attachment portion 55 of the slider 51 with a bolt, and an injection nozzle 82 that is detachably attached to the distal end portion of the nozzle body 81. One end of the high-pressure hose 83 is connected to the rear end of the nozzle body 81 via a hose joint, and one end of the abrasive hose 84 is connected to the side of the nozzle body 81 via a hose joint.
The nozzle body 81 is configured such that the vertical position of the slider 51 with respect to the second mounting portion 55 and the mounting angle with respect to the second mounting portion 55 can be adjusted, whereby the vertical position and spray angle of the spray nozzle 82 are adjusted. Is configured to be adjustable.

  The other end of the high pressure hose 83 is connected to the discharge port of the high pressure pump 6 of the pump unit 2, and the other end of the abrasive hose 84 is connected to the abrasive supply port of the abrasive supply unit. High-pressure water is supplied to the nozzle body 81 via the hose 83, and the abrasive is supplied from the abrasive supply unit to the nozzle body 81 via the abrasive hose 84. The high-pressure water and the abrasive are combined together to form the nozzle body. 81 is guided to the injection nozzle 82 and injected.

The other end of the recovery hose 67 is connected to a recovery unit equipped with a vacuum pump or the like. By driving the recovery unit, high-pressure water, abrasives, etc. are sucked from the space 75 through the recovery hose 67 and recovered by the recovery unit. To be processed.
The recovery unit detects the number of rotations of a drive motor such as a vacuum pump, and is controlled to be turned on and off according to the number of rotations. In addition, you may make it drive the vacuum pump etc. of a collection | recovery unit manually.

  As shown in FIG. 3, the top plate 64 of the guide body 62 is provided with three outside air intake holes 68 penetrating the inside and outside of the space 75, and the inside of the space 75 is formed through the outside air intake hole 68. Outside air is taken in. In this case, an adjustment plate 69 provided with adjustment holes 70 having the same shape and size as the three outside air intake holes 68 at the same interval is provided on the top plate 64. The amount of outside air taken into the closed space 75 can be adjusted by adjusting the mounting position and adjusting the opening area of each outside air intake hole 68.

  As shown in FIGS. 3 and 7, a partition member 72 is provided at a substantially central portion of the top plate 64 of the guide body 62, and the partition member 72 provides an injection nozzle 82 and a recovery hole 66 in the closed space 75. The first space 76 on the side and the second space 77 on the side where the outside air intake hole 68 is provided are partitioned.

  The partition member 72 includes a substantially L-shaped partition member main body 73 provided integrally with the top plate 64, and a seal member 74 attached to the distal end portion of the partition member main body 73, and the distal end portion of the seal member 74 is a surface layer of the casing. It comes in contact with the surface of the part. Note that the partition member 72 is not limited to a substantially L shape, and may have another shape.

  The seal member 74 is made of an elastic body such as rubber, and can be attached to the distal end portion of the partition member main body 73 by fitting the distal end portion of the partition member main body 73 into the attachment groove in the base end portion. It has become.

  As shown in FIG. 7, the distal end portion of the seal member 74 is curved inward (inward of the guide main body 62), and the curved distal end portion is brought into contact with the surface of the surface layer portion of the casing to thereby surface the surface layer portion. The closed space 75 is partitioned into a first space 76 and a second space 77.

  In order to carry out construction work such as repairing or repairing the surface layer portion of the concrete structural frame using the water jet device 1 according to the present embodiment configured as described above, first, the guide rail 47 of the guide means 46 is used. Is attached to the surface of the surface layer of the housing.

  Next, the pump unit 2, the motor unit 10, the abrasive supply unit, and the recovery unit are driven, high pressure water is supplied from the pump unit 2 to the nozzle body 81 via the high pressure hose 83, and the abrasive is supplied from the abrasive supply unit. Abrasive material is supplied to the nozzle body 81 via the supply hose 84, the high-pressure water and abrasive material are guided from the nozzle body 81 to the injection nozzle 82, and the high-pressure water and abrasive material are injected from the injection nozzle 82 toward the surface layer of the housing. Let

  Next, the stepping motor 56 is driven, the slider 51 is moved along the guide rail 47, and the nozzle guide 61 and the spray nozzle 82 are moved by following the slider 51, whereby the spray nozzle 82 is formed on the surface layer of the housing. A groove or the like corresponding to the movement locus is formed. In this case, the high-pressure water and the abrasive used for forming the groove or the like of the surface layer portion of the housing are sucked from the closed space 75 through the recovery hose 67, and are recovered and disposed of by the recovery unit.

  In this way, grooves and the like are formed in the surface layer portion of the housing, and after removing the surface layer portion of the housing from the upper portion of the base layer portion, the stepping motor 56 is stopped and the pump unit 2, the motor unit 10, and the abrasive supply unit Then, the recovery unit is stopped, and the guide rail 47 is removed from the surface of the surface layer portion.

  In the water jet apparatus 1 according to the present embodiment configured as described above, a closed space 75 is formed between the surface of the surface layer portion of the housing by the nozzle guide 61, and the injection nozzle 82 is formed in the closed space 75. Therefore, vibrations and noises generated when high pressure water and abrasives are injected from the injection port of the injection nozzle 82 to form a groove or the like in the surface layer portion of the housing are outside the closed space 75. Leakage can be prevented, and the surrounding living environment can be prevented from being affected.

  Further, the closed space 75 is partitioned into a first space 76 and a second space 77 by the partition member 72, and an injection port and a recovery hole 66 of the injection nozzle 82 are opened in the first space 76, Since the outside air intake hole 68 is opened, the sound and vibration when the high pressure water and the abrasive are injected from the injection port of the injection nozzle 82 can be attenuated by the partition member 72, which affects the surrounding living environment. Can be more effectively prevented.

  Furthermore, since the high-pressure water and the abrasive are jetted from the injection nozzle 82 in the closed space 75, the high-pressure water and the abrasive do not leak out of the closed space 75 and scatter around the work space. There will be no deterioration.

  In addition, since the water jet apparatus 1 of this Embodiment has connected the pump unit 2 and the motor unit 10 so that isolation | separation is possible, by making the pump unit 2 and the motor unit 10 into the state isolate | separated, for example, It can be mounted on an existing small elevator of a concrete structure and carried into the site or taken out from the site.

  In the above description, the guide rail 47 of the guide means 46 is a rectangular plate. However, the guide rail 47 is formed in a curved shape or other shapes, and ejected along the guide rail 47 via the slider 51. You may comprise so that the nozzle 82 may be moved.

  In the above description, the nozzle guide 61 and the nozzle 80 are movably supported by the guide means 46. However, without using the guide means 46, the operator manually moves the nozzle guide 61 and the nozzle 80. You may comprise.

DESCRIPTION OF SYMBOLS 1 Water jet apparatus 2 Pump unit 3 1st trolley 4 1st base frame 5 Caster 6 High pressure pump 7 Plunger 8 Input shaft 10 Motor unit 11 2nd trolley 12 2nd base frame 13 Caster 14 Motor 15 Output shaft 20 Connecting means 21 Universal joint 22 First joint part 23 First yoke 24 Second yoke 25 Coupling means 26 Joint cover 27 Second joint part 28 First yoke 29 Second yoke 30 Coupling means 31 Joint cover 32 Coupling mechanism 33 Coupling bush 34 Coupling shaft 40 Fixed member 41 Hinge 45 Nozzle unit 46 Guide means 47 Guide rail 48 Lower plate 49 Side plate 50 Upper plate 51 Slider 52 Moving plate 53 Side plate 54 First mounting portion 55 Second mounting portion 56 Drive source (stepping motor) 57 Pinion gear 58 Rack 59 1st roller 0 second roller 61 nozzle guide 62 guide body 63 peripheral plate 64 top plate 65 nozzle hole 66 collection hole 67 collection hose 68 outside air intake hole 69 adjustment plate 70 adjustment hole 71 seal member 72 partition member 73 partition member body 74 seal member 75 Closed space 76 First space 77 Second space 80 Nozzle 81 Nozzle body 82 Injection nozzle 83 High-pressure hose 84 Abrasive material hose

Claims (4)

A water jet device comprising: a pump unit having a pump for generating high-pressure water; a motor unit having a motor for rotating the pump; and a nozzle unit having a nozzle for injecting high-pressure water generated by the pump. ,
The nozzle unit includes a nozzle guide that forms a closed space with an object,
The nozzle guide is provided in an annular peripheral plate, a guide main body made of a top plate when the upper end opening of the peripheral plate is closed, and a lower end opening of the guide main body, and seals between the object. An annular seal member, a first space and a second space, which are provided at a substantially central portion of the top plate and whose front end portion is in contact with the object and in which only the peripheral edge portion communicates with each other in the closed space. A partition member that divides into
A portion of the top plate corresponding to the first space is provided with a nozzle hole through which the nozzle is inserted, and a recovery hole for connecting a recovery hose for recovering high-pressure water sprayed from the nozzle from the closed space. And
The water jet device according to claim 1, wherein an outside air intake hole that takes in outside air into the closed space is provided in a portion corresponding to the second space of the top plate . The water jet device according to claim 1 , wherein an adjustment plate for adjusting an opening area of the outside air intake hole is provided at a portion of the top plate corresponding to the outside air intake hole. .   The water jet device according to claim 1, wherein the nozzle guide is supported by a guide means so as to be movable. The guide means includes a guide rail and a slider movable along the guide rail,
The water jet device according to claim 3, wherein the nozzle guide is attached to the slider.

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