JP2005305566A - Concrete chipping machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete chipping machine capable of further smoothly finishing a chipping surface by a jet of injection density further uniform more than conventional injection density. <P>SOLUTION: This concrete chipping machine supports a water jet cutter for installing a support 23 of a rotatingly driven water jet nozzle 27 on a support beam 14 so as to be capable of traveling in front of a traveling car body 1. A nozzle holder 53 for juxtaposing and holding the nozzle tip 54 of the water jet nozzle 27 in a straight line shape, is radially arranged to the rotational center. An angle between the adjacent nozzle holders 53 is set to 90 degrees or less. A nozzle tip 54 position is set so that a distance from the rotational center becomes respectively different. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete chipping machine that performs cleaning, suspending, polishing, and the like with a water jet that is an ultra-high pressure water jet.

  The water jet is a technology that applies a very high pressure to the water and destroys the opponent that hits it when it is jetted, and a special pump that generates ultra-high pressure in the water and the jet speed by narrowing the water flow to increase the breaking force And a holding / moving mechanism that reliably holds the nozzle against the reaction force of the jet and moves the nozzle to an appropriate position relative to the concrete surface that is the workpiece.

  As such a water jet, there is a water jet machine in which a water jet nozzle is provided at the front part of a traveling vehicle body equipped with a traveling mechanism by wheels and crawler belts, and this water jet is jetted while traveling. If the direction is the X direction, a holding / moving mechanism for the water jet nozzle is provided at the front portion of the traveling vehicle body in order to obtain a working range in the Y direction perpendicular to the X direction.

Such a water jet nozzle holding / moving mechanism is provided with a support beam having a rail protruding in the front width direction of the traveling vehicle body, and a support for the water jet nozzle having a roller sliding on the rail on the support beam. It is attached so that it can run. Conventionally, the operation of the water jet nozzle is known to perform the rotation operation independently.
For example, a concrete chipping machine according to the following patent document is known.

JP 07-164393

  Referring to FIG. 14, which is a side view of an example of a conventional concrete chipping machine, and FIG. 15, which is a top view of the main part of the same, a crawler-type traveling vehicle body 1 having a rubber crawler belt 1 a, a diesel engine 2, In addition to the mechanisms required for traveling, such as the radiator / oil cooler 3, the traveling pump 8, the traveling hydraulic motor 5, and the traveling valve 6, operating mechanisms such as the hydraulic oil tank 9, the working machine pump 10, and the working machine valve 11 are mounted. Furthermore, a steering lever right turn 12a, a steering lever left turn 12b, a clutch lever 12c, a brake lever 12d, and the like are provided as driving operation mechanisms.

  A link arm 13 having a parallelogram-shaped opposite side portion as a support arm is provided at the front portion of the traveling vehicle body 1, and the support beam 14 is supported by the link arm 13. The link beam 13 can be moved up and down by changing the flat angle by extending and contracting the elevating jack 15.

  Further, an outrigger 22 provided with casters 21 is provided at the lower end of the outer end of the support beam 14, and rails 18 a and 18 b are projected on the upper and lower sides of the support beam 14 along the length direction, thereby supporting the support 23 of the water jet nozzle 27. A sliding roller 24 as a double roller that travels on the rails 18 a and 18 b is provided above and below the support member 14, and the support member 23 is attached to the support beam 14 through the sliding roller 24 so as to be movable in its length direction.

  A rotating shaft tube 26 having a swivel 25 is provided on the support 23 so as to be rotated by a hydraulic motor (nozzle rotating motor) 28, and the tip of the rotating shaft tube 26 located at the center is branched to the left and right. The water jet nozzles 27 are arranged at equal intervals on the circumference of the lever, and the periphery is surrounded by a cylindrical hood 29a so that water, crushed stone, and cement are not scattered around.

  When the concrete chipping machine is used, the traveling vehicle body 1 is caused to travel, and at the same time, a chain (not shown) is moved by the hydraulic motor 34 to reciprocate the support 23 along the support beam 14, and the water jet nozzle 27 is moved by the hydraulic motor 28. The concrete layer deteriorated by the jet water from the water jet nozzle 27 is suspended, washed, polished, and the like while rotating. According to this, by a rotation of the water jet nozzle 27 and a reciprocation of the support body 23, it is possible to perform a chip having a certain width.

  Here, the nozzle holder that holds the nozzle tip of the water jet nozzle 27 includes a series type in which a plurality of nozzle tips are arranged in a line on one linear nozzle holder, and one unit (a bit) of the plurality of nozzle tips. In general, two types of bit type in which a plurality of nozzle holders are arranged on the circumference are used.

  For example, as shown in FIGS. 16 and 17, the in-line type nozzle holder includes a rotating shaft tube 26 serving as an inlet for high-pressure water at a middle position in the longitudinal direction of a nozzle holder 53 extending in the left-right direction in the drawing. It fits so that it may communicate with the high pressure water flow path in the holder 53. The high-pressure water flow path extending in the longitudinal direction in the nozzle holder 53 branches downward in the middle and is connected to the nozzle tip 54. Further, both ends of the high-pressure water flow path in the nozzle holder 53 are closed with plugs 53b so that the water pressure is directed toward the nozzle tip 54.

  Thereby, the high-pressure water flowing into the high-pressure water flow path in the nozzle holder 53 through the rotating shaft pipe 26 is jetted as a jet jet from each nozzle tip 54. Further, due to the rotation of the rotating shaft tube 26, the trajectory of this jet jet draws a circle whose radius is the distance from the center of rotation to each nozzle tip 54.

  On the other hand, as shown in FIGS. 18 and 19, for example, the bit type nozzle holder connects a stem 55 that branches in a cross direction from a rotating shaft tube 26 serving as an inlet of high-pressure water. The tip of the stem 55 is bent downward and further branches into four nozzle tips 54 at the tip. The nozzle holder 53 holds the four nozzle tips 54 as one unit (bit). In the figure, reference numeral 50 denotes a ground for branching the high-pressure water flow path from the rotary shaft pipe 26 to the stem 55, 51 denotes a collar, and 52 denotes an arm for fixing the stem.

  Also in this case, the high-pressure water is jetted as a jet jet from the nozzle tip 54 through the rotating shaft tube 26 and the stem 55, and the trajectory of this jet jet has a radius from the center of rotation to each nozzle tip 54. Draw a circle to do.

  Here, in order to finish the chipping surface smoothly, it is important to inject the jet jet uniformly onto the concrete surface. However, the water pressure of the jet jet is constant, while the nozzle jet from the rotation center of each nozzle tip is constant. Since the distances are different, there is a difference in the injection density depending on the location. That is, since the peripheral speed increases as the distance from the center of rotation increases, the jet range of the jet flow per unit time is widened, resulting in a reduction in jet density.

  In order to prevent this, it is conceivable to reduce the distance between the nozzle tips as the distance from the rotation center increases. However, in the case of an in-line type nozzle holder, since the nozzle tips are arranged in a straight line, the interval between the nozzle tips is limited by the size of the nozzle tips themselves. Further, in the bit type nozzle holder, only a rough position adjustment for each bit can be performed. For this reason, in any case, there has been a problem in that fine adjustment of the position of the nozzle tip cannot be performed, and a jet jet having a uniform injection density cannot be obtained.

  An object of the present invention is to provide a concrete deburring machine that can eliminate the inconvenience of the conventional example and can finish the chipping surface more smoothly by a jet jet having a more uniform injection density than the conventional one.

  In order to achieve the above object, the present invention provides a concrete chipping machine for supporting a water jet cutting device in which a rotating water jet nozzle support is attached to a beam so as to be able to travel in front of a traveling vehicle body. The nozzle holders that hold the nozzle tips of the water jet nozzles in a straight line are arranged radially with respect to the rotation center, the angle between adjacent nozzle holders is 90 degrees or less, and the distance from the rotation center is The gist is that the nozzle tip position is set differently.

  According to the first aspect of the present invention, the nozzle tip position is set so that the angle between the nozzle holders arranged radially with respect to the rotation center is 90 degrees or less and the distance from the rotation center is different. The interval of the trajectory drawn by the jet jet from the tip can be set finer than when a series or bit type nozzle holder is used, and a jet jet with a more uniform jet density can be obtained.

  The gist of the invention described in claim 2 is that the nozzle holder includes a plurality of nozzle tips, and the interval between the nozzle tips is set narrower as the nozzle holder is separated from the rotation center.

  According to the second aspect of the present invention, the interval between the nozzle tips is set to be narrower as the distance from the rotation center increases. Therefore, in the vicinity of the outer side from the rotation center, the circumferential injection density is reduced to the radial direction. By improving the injection density, the injection density can be kept appropriate.

  The gist of the invention described in claim 3 is that the nozzle holder includes a plurality of nozzle tips, and the diameter of the nozzle tip is set larger as the nozzle holder is separated from the rotation center.

  According to the third aspect of the present invention, the diameter of the nozzle tip is set larger as the distance from the rotation center increases. By jetting a stronger jet jet from the tip of a large nozzle, the jet density can be kept appropriate.

  The gist of the invention described in claim 4 is that the nozzle holder is variable in angle around an axis extending radially from the rotation center of the water jet nozzle and / or in the outer circumferential direction from the rotation center.

  According to the fourth aspect of the present invention, the angle of the nozzle holder is changed around the axis extending radially from the rotation center of the water jet nozzle in correspondence with the concrete strength, so that a chip suitable for the concrete strength can be obtained. Become. Further, if the nozzle holder is inclined in the outer peripheral direction from the rotation center of the water jet nozzle, the trajectory of the jet jet becomes smooth and wide, the construction range can be increased while maintaining a smooth chip surface, and efficiency is improved.

  The gist of the invention described in claim 5 is that the nozzle tip position is set so that the ratio of the shortest distance to the longest distance from the rotation center of the water jet nozzle is 1: 3.

  According to the fifth aspect of the present invention, the diameter (inner peripheral diameter) of the circle drawn by the jet jet at the nozzle tip closest to the rotation center of the water jet nozzle is the same as that of the nozzle tip closest to the rotation center of the water jet nozzle. Since it is the same as the difference in distance from the tip of the far nozzle, just by moving the traveling vehicle body by the inner diameter in the direction perpendicular to the reciprocating transverse direction of the water jet nozzle traveling along the beam, in the traveling direction of the traveling vehicle body Also, the jet density of the jet can be made uniform.

  The concrete chipping machine of the present invention can finish the chipping surface more smoothly by a jet jet having a more uniform jet density than conventional ones.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall plan view of an embodiment of a concrete chipping machine of the present invention, and FIG. 2 is a side view of the same.

  In the figure, reference numeral 1 denotes a crawler type traveling vehicle body having a rubber traveling crawler belt 1a, which is a diesel engine 2, an engine panel 2a, a radiator / oil cooler 3, a fuel tank 4, a precleaner 17a, an air cleaner 17, an exhaust muffler 18, and a hydraulic pump. In addition to a mechanism required for traveling such as the traveling pump 8, an operating mechanism such as a hydraulic oil tank 9 is mounted, and a control panel 16 for performing various controls is provided so as to be openable and closable by 90 ° from the traveling vehicle body 1. There is a patrol light 19 or the like that calls attention to the surroundings during work.

  A slide arm 20 that is rotatable in the lateral direction of the traveling vehicle body 1 is provided on the front upper side of the traveling vehicle body 1, and a rotating disk 20 c is provided on the front end side of the slide arm 20. The connecting portion between the traveling vehicle body 1 and the slide arm 20 is provided with an upper turning motor 20a in which the slide arm 20 rotates relative to the traveling vehicle body 1 by the rotation, and the connecting portion between the slide arm 20 and the rotating disk 20c is provided at the connecting portion. Is provided with a lower turning motor 20b that rotates the turntable 20c relative to the slide arm 20 by rotation thereof. And the working device 29 is attached to the front part of the turntable 20c via the multilink mentioned later.

  The working device 29 including the water jet cutting device includes a lateral reciprocating drive mechanism of the water jet nozzle 27, a rotation drive mechanism of the water jet nozzle 27, and a swing drive mechanism.

  The lateral reciprocating drive mechanism of the water jet nozzle 27 is configured as follows. FIG. 3 is a front view of the reciprocating drive mechanism of the water jet nozzle 27, FIG. 4 is a plan view of the reciprocating drive mechanism in the normal state, and FIG. 5 is a plan view in an expanded state of the reciprocating drive mechanism. As shown, the support beam 14 employs a double tube structure of an inner tube 36 and an outer tube 37, and has a telescopic structure in which the inner tube 36 slides left and right outward relative to the outer tube 37.

  The first and second rails 9 a and 9 b are juxtaposed in front of the support beam 14 along the length direction of the support beam 14, and the ends thereof are coupled to the flanges on the outer ends of the inner tubes 36. A sliding roller 24 as a double roller that runs on the rails 9a and 9b is provided above and below the support body 23 of the water jet nozzle 27, and the support body 23 is provided on the support beam 14 via the sliding roller 24 in the longitudinal direction. Mount movably.

  The support 23 is pulled by a traversing chain 35 extending between the left and right ends of the support beam 14 by a traversing motor 34 which is a hydraulic motor. The chain 35 is endless and wound around a sprocket 36 a provided at the outer end of each inner tube 36, wound around a sprocket 36 b provided at the inner end of the inner tube 36, and then folded inside the outer tube 37. It is wound around the sprockets 37a provided on the outer ends of the sprockets 37a. In this way, even if each outer tube 37 moves to the left and right, the sprocket 37a always plays a role of absorbing the slack of the chain 35.

  Further, an auxiliary sprocket 37b is provided in the vicinity of the sprocket 37a, and the driving sprocket of the traverse motor 34 is pressed against the chain 35 between the sprockets 37a and 37b, so that power is reliably transmitted to the chain 35 in a state where the chain 35 is in tension. To do.

  Note that the sliding mechanism of the outer tube 37 with respect to the inner tube 36 of the support beam 14 may be manually operated or moved by a screw shaft. In this embodiment, the first rail 9a is moved. A telescopic hydraulic cylinder 38 is spanned between the first connecting portion 9c connecting the top and bottom, the second connecting portion 9d connecting the top and bottom of the second rail 9b, and the left and right ends in the inner pipe 36.

  The rotation drive mechanism of the water jet nozzle 27 will be described with reference to FIGS. 1 and 2 again. A rotating shaft tube 26 having a swivel 25 is provided so as to be driven to rotate by a nozzle rotation motor 28 which is a hydraulic motor via a gear in a gear box 41, and a water jet nozzle is provided at the tip of the rotating shaft tube 26. (Cleaving nozzle) 27 is provided. The rotational drive mechanism is fixedly mounted on a holding plate 42b of a swing frame 42 (described later) suspended from the upper portion of the support 23.

  The swing frame 42 is configured by vertically forming a holding plate 42 b in front of a swing plate 42 a that is substantially parallel to the support 23, and the upper end of the swing plate 42 a is formed from the left and right ends of the upper portion of the support 23. It fixes to the rotating shaft 44 laid over the support piece 43 which protrudes ahead. In this state, the lower surface of the holding plate 42b is oriented horizontally with respect to the chip surface.

  Further, a swing motor 45 made of a hydraulic motor is fixed on the holding plate 42b, and the tip 45a of the rotating shaft projects from the bottom of the holding plate 42b, and the swing motor 45 rotates on the tip 45a of the swing motor 45. The swing cam 46 that changes the operation to the swing motion in the front-rear direction with respect to the support 23 is meshed, and one end of the swing cam 46 is fixed to the support 23. Thus, the swing motor 45 and the swing cam 46 constitute a swing drive mechanism.

  In addition to the reciprocating drive mechanism, the rotary drive mechanism, and the swing drive mechanism, an extendable outrigger 22 is provided on both sides of the work device 29, and a caster 21 that slides on the concrete surface is attached to the lower end thereof.

  Next, the structure of the multilink which connects the front part of the turntable 20c by the side of the traveling vehicle body 1 and the working device 29 is demonstrated. The multi-link 31 includes a lower link that is a left and right parallel link and a central top link, and a link cylinder 32 is provided above the left and right lower links.

  Since all the multilinks 31 are composed of pivotable link arms, a lateral rod 30 is further bridged between the front portion of the turntable 20c on the traveling vehicle body 1 side and the work device 29 to support the work device 29. .

  A configuration near the tip of the water jet nozzle 27 is shown in FIG. The water jet nozzle 27 is connected to a rotating shaft pipe 26 serving as an inlet for high-pressure water, and a stem 55 that branches the high-pressure water flow passage in a cross direction. Further, the stem 55 holds the nozzle tip 54 of the water jet nozzle 27. It fits so that it may communicate with the high pressure water flow path in the nozzle holder 53. As a result, the angle between adjacent nozzle holders 53 is 90 degrees, and the number of nozzle holders 53 is four. The angle between adjacent nozzle holders 53 may be 90 degrees or less, but is set so that all the angles are uniform so that the rotation of the water jet nozzle 27 is stabilized.

  The high-pressure water flow path extending in the longitudinal direction in the nozzle holder 53 branches downward in the middle and is connected to the nozzle tip 54. Further, the end of the high-pressure water flow path in the nozzle holder 53 is closed by the plug 53b so that the water pressure is directed toward the nozzle tip 54.

  Below the nozzle holder 53 is a nozzle cover 53a that covers the nozzle tip 54 to the vicinity of the jet jet position. Further, as shown in FIGS. 7 and 8, a gland 50 is fitted as a rotation shaft to the nozzle holder 53 so that the nozzle holder 53 can rotate around the internal high-pressure water flow path, and is fixed. By tightening the bolt 56, the nozzle holder 53 is fixed to the nozzle holder holding member 56a. The nozzle holder holding member 56 a is screwed and fixed to the rotary shaft tube 26 via the arm 52, and its lower surface is in sliding contact with the upper surface of the nozzle holder 53, and the sliding contact surface is from the center of the ground 50 to the nozzle holder 53. It is a curved surface with the radius of curvature as the distance to the top of the.

  The nozzle tip 54 has a diameter of 16 mm, and is arranged in a straight line on the nozzle holder 53 by four, and is positioned so that the distance from the adjacent nozzle tip 54 becomes narrower as the distance from the rotation center increases. Further, the nozzle tips 54 of the four nozzle holders 53 are set to have different distances from the rotation center.

  Further, the position of the nozzle tip is set so that the ratio of the distance from the rotation center of the nozzle tip 54 closest to the rotation center of the water jet nozzle 27 and the farthest nozzle tip 54 is 1: 3.

  In the figure, 50 is a gland attached to the branch point of the high-pressure water flow path, 51 is a collar, 57 is an adapter, and 58 is a bracket. An upper cover is provided to prevent splashing of water droplets and pebbles caused by cutting by a jet jet. 59a, a side cover 59b, and an anti-scattering brush 59c that covers the lower side surface.

Next, usage and operation will be described with reference to FIG.
When the traveling vehicle body 1 is moved to the work target position, when the crawler belt 1a of the traveling vehicle body 1 rides on the step and the traveling vehicle body 1 is tilted, the operation switch 29 of the control panel 16 is operated, and the posture of the working device 29 becomes horizontal. The link cylinder 32 and the outrigger 22 are controlled to extend and contract. By using the multi-link 31 and the lateral rod 30, the work device 29 does not follow the inclination of the traveling vehicle body 1, so that the working device 29 automatically ensures a horizontal state even when the traveling vehicle body 1 is inclined. Can be made.

  Further, by rotating and sliding the slide arm 20 and rotating the turntable 20c, the working device 29 is positioned along the inclined wall surface as shown in FIG. 10, or the high wall surface as shown in FIG. Even in the case of positioning at the position, the load of the working device 29 that cannot be supported by the multilink 31 alone can be supported by the support using the lateral rod 30, and the working device 29 can be positioned stably at a desired position. .

  Furthermore, in this case, by controlling not only the rotation / sliding operation of the slide arm 20 and the turntable 20c but also the expansion / contraction of the link cylinder, the work device 29 can be more reliably moved along the inclination of the wall surface.

  Further, according to the support of the multi-link 31 and the lateral rod 30, the working device 29 does not follow the inclination of the traveling vehicle body 1, but the chiseling operation is started to move the traveling vehicle body 1 in the direction of the arrow in FIG. 12. When traveling, the lateral rod 30 reliably transmits the steering operation of the traveling vehicle body 1 to the work device 29.

  When it is necessary to extend the support beam 14 for moving the support 23 of the water jet nozzle 27, the hydraulic cylinder 38 is extended and the inner tube 36 is slid left and right outward with respect to the outer tube 37. Move. In such an extended state, as shown in FIG. 5, the first and second rails 9a and 9b move outward together with the inner tube 36 and are shifted to the left and right.

  On the other hand, the sliding roller 24 of the support 23 is a double roller, and both the rails 9a and 9b are engaged at the place where the first and second rails 9a and 9b are arranged. Since one of the double rollers engages with the rail even at the end where only this exists, the support 23 can move on the rail without any trouble.

  Next, the chipping operation will be described. The traveling vehicle body 1 is caused to travel, and at the same time, the chain 35 is moved by the hydraulic motor 34 to reciprocate the support 23 along the support beam 14. When the traveling vehicle body 1 travels, the support beam 14 is supported by an outrigger 22 with left and right casters 21.

  Next, when the swing motor 45 is rotated, the rotation operation is converted into a swing operation in the front-rear direction with respect to the support 23 by the swing cam 46, and the swing plate 42a has the center of the rotation shaft 44 as the swing center. Swing. Accordingly, the rotational drive mechanism coupled to the swing motor 45 via the holding plate 42b also swings in the front-rear direction with respect to the support 23.

  Then, about 240 (MPa) of high-pressure water is supplied from the high-pressure water inlet 47 at 60 (l / min), the water jet nozzle 27 is driven to rotate by the nozzle rotation motor 28, and the water jet nozzle 27 is driven by the swing motor 45. While swinging and driving, jet water from the water jet nozzle 27 is sprayed at an angle of about 22 degrees to perform operations such as peeling and polishing of concrete.

  By performing the work in this manner, the water jet nozzle 27 reciprocates in a direction perpendicular to the traveling direction of the traveling vehicle body 1 while rotating, and a swinging motion that swings in the traveling direction of the traveling vehicle body 1 is also added. Therefore, it was confirmed that the width of the reciprocating pitch spreads and overlaps, and no transverse line appears for each pitch on the chipping surface, and further, it is possible to chip up to the concrete below the reinforcing bar.

  Here, four nozzle holders 53 are provided as shown in FIG. 12 which shows the trajectory by the jet flow when only the rotary motion is removed, excluding the influence of the reciprocating traveling and swinging motion of the water jet nozzle 27 in the direction of the support beam 14. As a result, the density gradient in the radial direction of the jet jet trajectory can be made smoother than in the case of using a series-type or bit-type nozzle holder. Thereby, the injection density becomes more uniform as a whole, and the chipped surface can be finished more smoothly.

  Furthermore, the diameter (inner diameter) of the circle drawn by the jet flow of the nozzle tip 54 closest to the rotation center of the water jet nozzle 27 is the distance between the nozzle tip closest to the rotation center of the water jet nozzle 27 and the farthest nozzle tip. Therefore, the traveling vehicle body 1 can be moved in the traveling direction of the traveling vehicle body 1 only by moving the traveling vehicle body 1 by the inner peripheral diameter in a direction orthogonal to the reciprocating transverse direction of the water jet nozzle 27 traveling along the support beam 14. The jet density of the jet can be made uniform, and the chipping surface can be made smoother.

  Further, as the distance from the rotation center of the water jet nozzle 27 increases, the diameter of the nozzle tip 54 may be increased instead of reducing the interval between the nozzle tips 54. For example, the position of the nozzle tip 54 is set so that the intervals between the trajectories drawn by the jet jet are equal, and the diameter of the nozzle tip 54 is set to 14 mm, 16 mm, 18 mm, and 20 mm, four from the side closer to the rotation center. .

  As shown in FIG. 13, the trajectory by the jet jet in this case is such that the diameter of the nozzle tip 54 increases toward the outer periphery, so that the high-pressure water energy is utilized even in the vicinity of the outer periphery away from the rotation center. Jet injection is possible, and a uniform injection density can be achieved as a whole.

  Further, the orientation of the nozzle tip 54 is usually perpendicular to the concrete surface as shown in FIG. 7, but the fixing bolt 56 is loosened and the nozzle holder 53 is tilted about the center of the ground 50. Since the jet jet is obliquely applied to the concrete surface, a wider range is cut with low strength. For this reason, when carrying out a chipping operation on a concrete surface that is severely deteriorated and can be cut even at lower strength than normal, it is possible to cut and polish a wider area per unit time by tilting the nozzle holder 53, and work efficiency is improved. good.

  Further, although not shown, if the nozzle holder 53 is tilted radially outward with respect to the center of rotation, the width of the jet jet trajectory can be increased smoothly, while maintaining a smooth chip surface. Since the range can be increased, the efficiency is good.

It is a top view of the whole picture in an embodiment of a concrete chipping machine of the present invention. It is a side view of FIG. It is a front view of the reciprocating drive mechanism of the water jet nozzle in the embodiment of the concrete chipping machine of the present invention. It is a top view of the normal state of the reciprocating drive mechanism of FIG. FIG. 4 is a plan view of a state in which the width of the reciprocating drive mechanism of FIG. 3 is expanded. It is a front view of the vicinity of the water jet nozzle tip which is the principal part in the embodiment of the concrete chipping machine of the present invention. It is a front view of the state which kept the nozzle holder perpendicular | vertical with respect to the concrete surface. It is a front view of the state which inclined the nozzle holder with respect to the concrete surface. It is explanatory drawing which looked at operation | movement of embodiment of the concrete chipping machine of this invention from back. It is a rear view which shows operation | movement of embodiment of the concrete chipping machine of this invention. It is a rear view which shows another operation | movement same as the above. It is explanatory drawing of the locus | trajectory of the jet jet by the concrete chipping machine of this invention. It is explanatory drawing of the locus | trajectory of the jet jet by the concrete chipping machine of this invention. It is a side view which shows an example of the conventional concrete chipping machine. FIG. 15 is a plan view of FIG. 14. It is a side view of the vicinity of the water jet nozzle tip of a conventional concrete chipping machine. It is a top view near the water jet nozzle front-end | tip of the conventional concrete chipping machine. It is an expansion | deployment side view near water jet nozzle front-end | tip of the other conventional concrete demolition machine. It is a bottom view of the vicinity of the water jet nozzle tip of another conventional concrete chipping machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling body 1a Crawler belt 2 Diesel engine 2a Engine panel 3 Radiator oil cooler 4 Fuel tank 5 Traveling hydraulic motor 6 Traveling valve 8 Traveling pump 9 Hydraulic oil tank 9a, 9b Rail 9c, 9d Connection part 10 Working machine pump 11 Working machine valve 12a Steering lever right turn 12b Steering lever left turn 12c Clutch lever 12d Brake lever 13 Link arm 14 Support beam 15 Lifting jack 16 Control panel 17 Air cleaner 17a Precleaner 18 Exhaust muffler 18a, 18b Rail 19 Patrite 20 Slide arm 20a Upper turning motor 20b Lower turning motor 20c Turntable 21 Caster 22 Outrigger 23 Support body 24 Sliding roller 25 Swivel 26 Rotating shaft tube 27 Water Jet nozzle 28 Nozzle rotation motor 29 Working device 29a Hood 30 Lateral rod 31 Multilink 32 Link cylinder 34 Hydraulic motor 35 Chain 36 Inner pipe 37 Outer pipe 36a, 36b, 37a, 37c Sprocket 38 Hydraulic cylinder 41 Gear box 42 Oscillating frame 42a Oscillating plate 42b Holding plate 43 Supporting piece 44 Rotating shaft 45 Oscillating motor 45a Tip 46 Oscillating cam 47 High-pressure water inlet 50 Gland 51 Color 52 Arm 53 Nozzle holder 53a Nozzle cover 53b Plug 54 Nozzle tip 55 Stem 56 Fixing bolt 56a Nozzle holder holding member 57 Adapter 58 Bracket 59a Upper cover 59b Side cover 59c Anti-scattering brush

Claims (5)

  In a concrete chipping machine that supports a water jet cutting device mounted on a beam so that the support of a water jet nozzle that is driven to rotate can be run on the beam, a nozzle holder that holds the nozzle tip of the water jet nozzle in a straight line is held. A concrete chipping machine characterized in that it is arranged radially with respect to the center of rotation, the angle between adjacent nozzle holders is 90 degrees or less, and the nozzle tip position is set so that the distance from the center of rotation is different.   The concrete chipping machine according to claim 1, wherein the nozzle holder includes a plurality of nozzle tips, and the interval between the nozzle tips is set narrower as the nozzle holder is separated from the rotation center.   The concrete chipping machine according to claim 1, wherein the nozzle holder includes a plurality of nozzle tips, and the diameter of the nozzle tip is set larger as the nozzle holder is separated from the rotation center.   The concrete chipping machine according to any one of claims 1 to 3, wherein the nozzle holder is variable in angle around an axis extending radially from a rotation center of the water jet nozzle and / or in an outer peripheral direction from the rotation center.   The concrete chipping machine according to any one of claims 1 to 4, wherein the nozzle tip position is set so that a ratio of the shortest distance to the longest distance from the rotation center of the water jet nozzle is 1: 3.

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